diff options
Diffstat (limited to 'net/batman-adv')
49 files changed, 3546 insertions, 944 deletions
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig index c6fc8f756c9a..f66930ee3c0b 100644 --- a/net/batman-adv/Kconfig +++ b/net/batman-adv/Kconfig @@ -12,9 +12,23 @@ config BATMAN_ADV B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing protocol for multi-hop ad-hoc mesh networks. The networks may be wired or wireless. See - http://www.open-mesh.org/ for more information and user space + https://www.open-mesh.org/ for more information and user space tools. +config BATMAN_ADV_BATMAN_V + bool "B.A.T.M.A.N. V protocol (experimental)" + depends on BATMAN_ADV && CFG80211=y || (CFG80211=m && BATMAN_ADV=m) + default n + help + This option enables the B.A.T.M.A.N. V protocol, the successor + of the currently used B.A.T.M.A.N. IV protocol. The main + changes include splitting of the OGM protocol into a neighbor + discovery protocol (Echo Location Protocol, ELP) and a new OGM + Protocol OGMv2 for flooding protocol information through the + network, as well as a throughput based metric. + B.A.T.M.A.N. V is currently considered experimental and not + compatible to B.A.T.M.A.N. IV networks. + config BATMAN_ADV_BLA bool "Bridge Loop Avoidance" depends on BATMAN_ADV && INET diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile index 21434ab79d2c..797cf2fc88c1 100644 --- a/net/batman-adv/Makefile +++ b/net/batman-adv/Makefile @@ -1,5 +1,5 @@ # -# Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +# Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: # # Marek Lindner, Simon Wunderlich # @@ -18,6 +18,9 @@ obj-$(CONFIG_BATMAN_ADV) += batman-adv.o batman-adv-y += bat_iv_ogm.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v_elp.o +batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v_ogm.o batman-adv-y += bitarray.o batman-adv-$(CONFIG_BATMAN_ADV_BLA) += bridge_loop_avoidance.o batman-adv-$(CONFIG_DEBUG_FS) += debugfs.o diff --git a/net/batman-adv/bat_algo.h b/net/batman-adv/bat_algo.h index 4e59cf3eb079..03dafd33d23b 100644 --- a/net/batman-adv/bat_algo.h +++ b/net/batman-adv/bat_algo.h @@ -1,6 +1,6 @@ -/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: * - * Marek Lindner + * Marek Lindner, Linus Lüssing * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -18,6 +18,32 @@ #ifndef _NET_BATMAN_ADV_BAT_ALGO_H_ #define _NET_BATMAN_ADV_BAT_ALGO_H_ +struct batadv_priv; + int batadv_iv_init(void); +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + +int batadv_v_init(void); +int batadv_v_mesh_init(struct batadv_priv *bat_priv); +void batadv_v_mesh_free(struct batadv_priv *bat_priv); + +#else + +static inline int batadv_v_init(void) +{ + return 0; +} + +static inline int batadv_v_mesh_init(struct batadv_priv *bat_priv) +{ + return 0; +} + +static inline void batadv_v_mesh_free(struct batadv_priv *bat_priv) +{ +} + +#endif /* CONFIG_BATMAN_ADV_BATMAN_V */ + #endif /* _NET_BATMAN_ADV_BAT_ALGO_H_ */ diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index df625de55ef2..cb2d1b9b0340 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -31,6 +31,7 @@ #include <linux/init.h> #include <linux/jiffies.h> #include <linux/list.h> +#include <linux/kref.h> #include <linux/netdevice.h> #include <linux/pkt_sched.h> #include <linux/printk.h> @@ -88,7 +89,7 @@ static void batadv_ring_buffer_set(u8 lq_recv[], u8 *lq_index, u8 value) * in the given ring buffer * @lq_recv: pointer to the ring buffer * - * Returns computed average value. + * Return: computed average value. */ static u8 batadv_ring_buffer_avg(const u8 lq_recv[]) { @@ -132,7 +133,7 @@ static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node) * @orig_node: the orig_node that has to be changed * @max_if_num: the current amount of interfaces * - * Returns 0 on success, a negative error code otherwise. + * Return: 0 on success, a negative error code otherwise. */ static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node, int max_if_num) @@ -180,7 +181,7 @@ unlock: * @max_if_num: the current amount of interfaces * @del_if_num: the index of the interface being removed * - * Returns 0 on success, a negative error code otherwise. + * Return: 0 on success, a negative error code otherwise. */ static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, int max_if_num, int del_if_num) @@ -246,7 +247,7 @@ unlock: * @bat_priv: the bat priv with all the soft interface information * @addr: mac address of the originator * - * Returns the originator object corresponding to the passed mac address or NULL + * Return: the originator object corresponding to the passed mac address or NULL * on failure. * If the object does not exists it is created an initialised. */ @@ -286,8 +287,8 @@ batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr) free_orig_node: /* free twice, as batadv_orig_node_new sets refcount to 2 */ - batadv_orig_node_free_ref(orig_node); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); return NULL; } @@ -396,7 +397,14 @@ static u8 batadv_hop_penalty(u8 tq, const struct batadv_priv *bat_priv) return new_tq; } -/* is there another aggregated packet here? */ +/** + * batadv_iv_ogm_aggr_packet - checks if there is another OGM attached + * @buff_pos: current position in the skb + * @packet_len: total length of the skb + * @tvlv_len: tvlv length of the previously considered OGM + * + * Return: true if there is enough space for another OGM, false otherwise. + */ static bool batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, __be16 tvlv_len) { @@ -470,7 +478,7 @@ static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, skb->len + ETH_HLEN); - batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); + batadv_send_broadcast_skb(skb, hard_iface); } } @@ -507,7 +515,7 @@ static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** @@ -522,7 +530,7 @@ out: * @if_outgoing: interface for which the retransmission should be considered * @forw_packet: the forwarded packet which should be checked * - * Returns true if new_packet can be aggregated with forw_packet + * Return: true if new_packet can be aggregated with forw_packet */ static bool batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, @@ -609,7 +617,7 @@ batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return res; } @@ -636,10 +644,10 @@ static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, unsigned char *skb_buff; unsigned int skb_size; - if (!atomic_inc_not_zero(&if_incoming->refcount)) + if (!kref_get_unless_zero(&if_incoming->refcount)) return; - if (!atomic_inc_not_zero(&if_outgoing->refcount)) + if (!kref_get_unless_zero(&if_outgoing->refcount)) goto out_free_incoming; /* own packet should always be scheduled */ @@ -703,9 +711,9 @@ out_nomem: if (!own_packet) atomic_inc(&bat_priv->batman_queue_left); out_free_outgoing: - batadv_hardif_free_ref(if_outgoing); + batadv_hardif_put(if_outgoing); out_free_incoming: - batadv_hardif_free_ref(if_incoming); + batadv_hardif_put(if_incoming); } /* aggregate a new packet into the existing ogm packet */ @@ -950,7 +958,7 @@ static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** @@ -995,9 +1003,9 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, neigh_addr = tmp_neigh_node->addr; if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && tmp_neigh_node->if_incoming == if_incoming && - atomic_inc_not_zero(&tmp_neigh_node->refcount)) { + kref_get_unless_zero(&tmp_neigh_node->refcount)) { if (WARN(neigh_node, "too many matching neigh_nodes")) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); neigh_node = tmp_neigh_node; continue; } @@ -1018,7 +1026,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, neigh_ifinfo->bat_iv.tq_avg = tq_avg; spin_unlock_bh(&tmp_neigh_node->ifinfo_lock); - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); neigh_ifinfo = NULL; } @@ -1033,7 +1041,7 @@ batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, ethhdr->h_source, orig_node, orig_tmp); - batadv_orig_node_free_ref(orig_tmp); + batadv_orig_node_put(orig_tmp); if (!neigh_node) goto unlock; } else { @@ -1108,13 +1116,13 @@ unlock: rcu_read_unlock(); out: if (neigh_node) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); if (neigh_ifinfo) - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); if (router_ifinfo) - batadv_neigh_ifinfo_free_ref(router_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); } /** @@ -1125,7 +1133,7 @@ out: * @if_incoming: interface where the packet was received * @if_outgoing: interface for which the retransmission should be considered * - * Returns 1 if the link can be considered bidirectional, 0 otherwise + * Return: 1 if the link can be considered bidirectional, 0 otherwise */ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, struct batadv_orig_node *orig_neigh_node, @@ -1154,7 +1162,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, if (tmp_neigh_node->if_incoming != if_incoming) continue; - if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) continue; neigh_node = tmp_neigh_node; @@ -1184,7 +1192,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); if (neigh_ifinfo) { neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count; - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); } else { neigh_rq_count = 0; } @@ -1257,7 +1265,7 @@ static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, out: if (neigh_node) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); return ret; } @@ -1269,7 +1277,7 @@ out: * @if_incoming: interface on which the OGM packet was received * @if_outgoing: interface for which the retransmission should be considered * - * Returns duplicate status as enum batadv_dup_status + * Return: duplicate status as enum batadv_dup_status */ static enum batadv_dup_status batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, @@ -1298,7 +1306,7 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); if (WARN_ON(!orig_ifinfo)) { - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return 0; } @@ -1308,7 +1316,8 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, /* signalize caller that the packet is to be dropped. */ if (!hlist_empty(&orig_node->neigh_list) && batadv_window_protected(bat_priv, seq_diff, - &orig_ifinfo->batman_seqno_reset)) { + BATADV_TQ_LOCAL_WINDOW_SIZE, + &orig_ifinfo->batman_seqno_reset, NULL)) { ret = BATADV_PROTECTED; goto out; } @@ -1344,7 +1353,7 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, packet_count = bitmap_weight(bitmap, BATADV_TQ_LOCAL_WINDOW_SIZE); neigh_ifinfo->bat_iv.real_packet_count = packet_count; - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); } rcu_read_unlock(); @@ -1358,8 +1367,8 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, out: spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); - batadv_orig_node_free_ref(orig_node); - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_node_put(orig_node); + batadv_orig_ifinfo_put(orig_ifinfo); return ret; } @@ -1505,7 +1514,7 @@ batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, ogm_packet, if_incoming, if_outgoing, dup_status); } - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); /* only forward for specific interface, not for the default one. */ if (if_outgoing == BATADV_IF_DEFAULT) @@ -1554,18 +1563,18 @@ batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset, out_neigh: if ((orig_neigh_node) && (!is_single_hop_neigh)) - batadv_orig_node_free_ref(orig_neigh_node); + batadv_orig_node_put(orig_neigh_node); out: if (router_ifinfo) - batadv_neigh_ifinfo_free_ref(router_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); if (router_router) - batadv_neigh_node_free_ref(router_router); + batadv_neigh_node_put(router_router); if (orig_neigh_router) - batadv_neigh_node_free_ref(orig_neigh_router); + batadv_neigh_node_put(orig_neigh_router); if (hardif_neigh) - batadv_hardif_neigh_free_ref(hardif_neigh); + batadv_hardif_neigh_put(hardif_neigh); kfree_skb(skb_priv); } @@ -1688,7 +1697,7 @@ static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Drop packet: originator packet from myself (via neighbor)\n"); - batadv_orig_node_free_ref(orig_neigh_node); + batadv_orig_node_put(orig_neigh_node); return; } @@ -1726,7 +1735,7 @@ static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset, } rcu_read_unlock(); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } static int batadv_iv_ogm_receive(struct sk_buff *skb, @@ -1796,7 +1805,7 @@ batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node, neigh_node->addr, n_ifinfo->bat_iv.tq_avg); - batadv_neigh_ifinfo_free_ref(n_ifinfo); + batadv_neigh_ifinfo_put(n_ifinfo); } } @@ -1859,9 +1868,9 @@ static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, batman_count++; next: - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); if (n_ifinfo) - batadv_neigh_ifinfo_free_ref(n_ifinfo); + batadv_neigh_ifinfo_put(n_ifinfo); } rcu_read_unlock(); } @@ -1929,7 +1938,7 @@ static void batadv_iv_neigh_print(struct batadv_priv *bat_priv, * @neigh2: the second neighbor object of the comparison * @if_outgoing2: outgoing interface for the second neighbor * - * Returns a value less, equal to or greater than 0 if the metric via neigh1 is + * Return: a value less, equal to or greater than 0 if the metric via neigh1 is * lower, the same as or higher than the metric via neigh2 */ static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, @@ -1955,9 +1964,9 @@ static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1, out: if (neigh1_ifinfo) - batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); + batadv_neigh_ifinfo_put(neigh1_ifinfo); if (neigh2_ifinfo) - batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); + batadv_neigh_ifinfo_put(neigh2_ifinfo); return diff; } @@ -1970,7 +1979,7 @@ out: * @neigh2: the second neighbor object of the comparison * @if_outgoing2: outgoing interface for the second neighbor * - * Returns true if the metric via neigh1 is equally good or better than + * Return: true if the metric via neigh1 is equally good or better than * the metric via neigh2, false otherwise. */ static bool @@ -1998,9 +2007,9 @@ batadv_iv_ogm_neigh_is_sob(struct batadv_neigh_node *neigh1, out: if (neigh1_ifinfo) - batadv_neigh_ifinfo_free_ref(neigh1_ifinfo); + batadv_neigh_ifinfo_put(neigh1_ifinfo); if (neigh2_ifinfo) - batadv_neigh_ifinfo_free_ref(neigh2_ifinfo); + batadv_neigh_ifinfo_put(neigh2_ifinfo); return ret; } diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c new file mode 100644 index 000000000000..4026f198a734 --- /dev/null +++ b/net/batman-adv/bat_v.c @@ -0,0 +1,359 @@ +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "bat_algo.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/bug.h> +#include <linux/cache.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/netdevice.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/seq_file.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +#include "bat_v_elp.h" +#include "bat_v_ogm.h" +#include "hard-interface.h" +#include "hash.h" +#include "originator.h" +#include "packet.h" + +static void batadv_v_iface_activate(struct batadv_hard_iface *hard_iface) +{ + /* B.A.T.M.A.N. V does not use any queuing mechanism, therefore it can + * set the interface as ACTIVE right away, without any risk of race + * condition + */ + if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) + hard_iface->if_status = BATADV_IF_ACTIVE; +} + +static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface) +{ + int ret; + + ret = batadv_v_elp_iface_enable(hard_iface); + if (ret < 0) + return ret; + + ret = batadv_v_ogm_iface_enable(hard_iface); + if (ret < 0) + batadv_v_elp_iface_disable(hard_iface); + + /* enable link throughput auto-detection by setting the throughput + * override to zero + */ + atomic_set(&hard_iface->bat_v.throughput_override, 0); + + return ret; +} + +static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface) +{ + batadv_v_elp_iface_disable(hard_iface); +} + +static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface) +{ +} + +static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface) +{ + batadv_v_elp_primary_iface_set(hard_iface); + batadv_v_ogm_primary_iface_set(hard_iface); +} + +static void +batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh) +{ + ewma_throughput_init(&hardif_neigh->bat_v.throughput); + INIT_WORK(&hardif_neigh->bat_v.metric_work, + batadv_v_elp_throughput_metric_update); +} + +static void batadv_v_ogm_schedule(struct batadv_hard_iface *hard_iface) +{ +} + +static void batadv_v_ogm_emit(struct batadv_forw_packet *forw_packet) +{ +} + +/** + * batadv_v_orig_print_neigh - print neighbors for the originator table + * @orig_node: the orig_node for which the neighbors are printed + * @if_outgoing: outgoing interface for these entries + * @seq: debugfs table seq_file struct + * + * Must be called while holding an rcu lock. + */ +static void +batadv_v_orig_print_neigh(struct batadv_orig_node *orig_node, + struct batadv_hard_iface *if_outgoing, + struct seq_file *seq) +{ + struct batadv_neigh_node *neigh_node; + struct batadv_neigh_ifinfo *n_ifinfo; + + hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) { + n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + if (!n_ifinfo) + continue; + + seq_printf(seq, " %pM (%9u.%1u)", + neigh_node->addr, + n_ifinfo->bat_v.throughput / 10, + n_ifinfo->bat_v.throughput % 10); + + batadv_neigh_ifinfo_put(n_ifinfo); + } +} + +/** + * batadv_v_hardif_neigh_print - print a single ELP neighbour node + * @seq: neighbour table seq_file struct + * @hardif_neigh: hardif neighbour information + */ +static void +batadv_v_hardif_neigh_print(struct seq_file *seq, + struct batadv_hardif_neigh_node *hardif_neigh) +{ + int last_secs, last_msecs; + u32 throughput; + + last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000; + last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000; + throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); + + seq_printf(seq, "%pM %4i.%03is (%9u.%1u) [%10s]\n", + hardif_neigh->addr, last_secs, last_msecs, throughput / 10, + throughput % 10, hardif_neigh->if_incoming->net_dev->name); +} + +/** + * batadv_v_neigh_print - print the single hop neighbour list + * @bat_priv: the bat priv with all the soft interface information + * @seq: neighbour table seq_file struct + */ +static void batadv_v_neigh_print(struct batadv_priv *bat_priv, + struct seq_file *seq) +{ + struct net_device *net_dev = (struct net_device *)seq->private; + struct batadv_hardif_neigh_node *hardif_neigh; + struct batadv_hard_iface *hard_iface; + int batman_count = 0; + + seq_printf(seq, " %-15s %s (%11s) [%10s]\n", "Neighbor", + "last-seen", "throughput", "IF"); + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != net_dev) + continue; + + hlist_for_each_entry_rcu(hardif_neigh, + &hard_iface->neigh_list, list) { + batadv_v_hardif_neigh_print(seq, hardif_neigh); + batman_count++; + } + } + rcu_read_unlock(); + + if (batman_count == 0) + seq_puts(seq, "No batman nodes in range ...\n"); +} + +/** + * batadv_v_orig_print - print the originator table + * @bat_priv: the bat priv with all the soft interface information + * @seq: debugfs table seq_file struct + * @if_outgoing: the outgoing interface for which this should be printed + */ +static void batadv_v_orig_print(struct batadv_priv *bat_priv, + struct seq_file *seq, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_node *neigh_node; + struct batadv_hashtable *hash = bat_priv->orig_hash; + int last_seen_msecs, last_seen_secs; + struct batadv_orig_node *orig_node; + struct batadv_neigh_ifinfo *n_ifinfo; + unsigned long last_seen_jiffies; + struct hlist_head *head; + int batman_count = 0; + u32 i; + + seq_printf(seq, " %-15s %s (%11s) %17s [%10s]: %20s ...\n", + "Originator", "last-seen", "throughput", "Nexthop", + "outgoingIF", "Potential nexthops"); + + for (i = 0; i < hash->size; i++) { + head = &hash->table[i]; + + rcu_read_lock(); + hlist_for_each_entry_rcu(orig_node, head, hash_entry) { + neigh_node = batadv_orig_router_get(orig_node, + if_outgoing); + if (!neigh_node) + continue; + + n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, + if_outgoing); + if (!n_ifinfo) + goto next; + + last_seen_jiffies = jiffies - orig_node->last_seen; + last_seen_msecs = jiffies_to_msecs(last_seen_jiffies); + last_seen_secs = last_seen_msecs / 1000; + last_seen_msecs = last_seen_msecs % 1000; + + seq_printf(seq, "%pM %4i.%03is (%9u.%1u) %pM [%10s]:", + orig_node->orig, last_seen_secs, + last_seen_msecs, + n_ifinfo->bat_v.throughput / 10, + n_ifinfo->bat_v.throughput % 10, + neigh_node->addr, + neigh_node->if_incoming->net_dev->name); + + batadv_v_orig_print_neigh(orig_node, if_outgoing, seq); + seq_puts(seq, "\n"); + batman_count++; + +next: + batadv_neigh_node_put(neigh_node); + if (n_ifinfo) + batadv_neigh_ifinfo_put(n_ifinfo); + } + rcu_read_unlock(); + } + + if (batman_count == 0) + seq_puts(seq, "No batman nodes in range ...\n"); +} + +static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2; + + ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); + ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); + + if (WARN_ON(!ifinfo1 || !ifinfo2)) + return 0; + + return ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput; +} + +static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1, + struct batadv_hard_iface *if_outgoing1, + struct batadv_neigh_node *neigh2, + struct batadv_hard_iface *if_outgoing2) +{ + struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2; + u32 threshold; + + ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1); + ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2); + + threshold = ifinfo1->bat_v.throughput / 4; + threshold = ifinfo1->bat_v.throughput - threshold; + + return ifinfo2->bat_v.throughput > threshold; +} + +static struct batadv_algo_ops batadv_batman_v __read_mostly = { + .name = "BATMAN_V", + .bat_iface_activate = batadv_v_iface_activate, + .bat_iface_enable = batadv_v_iface_enable, + .bat_iface_disable = batadv_v_iface_disable, + .bat_iface_update_mac = batadv_v_iface_update_mac, + .bat_primary_iface_set = batadv_v_primary_iface_set, + .bat_hardif_neigh_init = batadv_v_hardif_neigh_init, + .bat_ogm_emit = batadv_v_ogm_emit, + .bat_ogm_schedule = batadv_v_ogm_schedule, + .bat_orig_print = batadv_v_orig_print, + .bat_neigh_cmp = batadv_v_neigh_cmp, + .bat_neigh_is_similar_or_better = batadv_v_neigh_is_sob, + .bat_neigh_print = batadv_v_neigh_print, +}; + +/** + * batadv_v_mesh_init - initialize the B.A.T.M.A.N. V private resources for a + * mesh + * @bat_priv: the object representing the mesh interface to initialise + * + * Return: 0 on success or a negative error code otherwise + */ +int batadv_v_mesh_init(struct batadv_priv *bat_priv) +{ + return batadv_v_ogm_init(bat_priv); +} + +/** + * batadv_v_mesh_free - free the B.A.T.M.A.N. V private resources for a mesh + * @bat_priv: the object representing the mesh interface to free + */ +void batadv_v_mesh_free(struct batadv_priv *bat_priv) +{ + batadv_v_ogm_free(bat_priv); +} + +/** + * batadv_v_init - B.A.T.M.A.N. V initialization function + * + * Description: Takes care of initializing all the subcomponents. + * It is invoked upon module load only. + * + * Return: 0 on success or a negative error code otherwise + */ +int __init batadv_v_init(void) +{ + int ret; + + /* B.A.T.M.A.N. V echo location protocol packet */ + ret = batadv_recv_handler_register(BATADV_ELP, + batadv_v_elp_packet_recv); + if (ret < 0) + return ret; + + ret = batadv_recv_handler_register(BATADV_OGM2, + batadv_v_ogm_packet_recv); + if (ret < 0) + goto elp_unregister; + + ret = batadv_algo_register(&batadv_batman_v); + if (ret < 0) + goto ogm_unregister; + + return ret; + +ogm_unregister: + batadv_recv_handler_unregister(BATADV_OGM2); + +elp_unregister: + batadv_recv_handler_unregister(BATADV_ELP); + + return ret; +} diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c new file mode 100644 index 000000000000..3844e7efd0b0 --- /dev/null +++ b/net/batman-adv/bat_v_elp.c @@ -0,0 +1,515 @@ +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "bat_v_elp.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/fs.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/netdevice.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/rtnetlink.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> +#include <net/cfg80211.h> + +#include "bat_algo.h" +#include "bat_v_ogm.h" +#include "hard-interface.h" +#include "originator.h" +#include "packet.h" +#include "routing.h" +#include "send.h" + +/** + * batadv_v_elp_start_timer - restart timer for ELP periodic work + * @hard_iface: the interface for which the timer has to be reset + */ +static void batadv_v_elp_start_timer(struct batadv_hard_iface *hard_iface) +{ + unsigned int msecs; + + msecs = atomic_read(&hard_iface->bat_v.elp_interval) - BATADV_JITTER; + msecs += prandom_u32() % (2 * BATADV_JITTER); + + queue_delayed_work(batadv_event_workqueue, &hard_iface->bat_v.elp_wq, + msecs_to_jiffies(msecs)); +} + +/** + * batadv_v_elp_get_throughput - get the throughput towards a neighbour + * @neigh: the neighbour for which the throughput has to be obtained + * + * Return: The throughput towards the given neighbour in multiples of 100kpbs + * (a value of '1' equals to 0.1Mbps, '10' equals 1Mbps, etc). + */ +static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh) +{ + struct batadv_hard_iface *hard_iface = neigh->if_incoming; + struct ethtool_link_ksettings link_settings; + struct station_info sinfo; + u32 throughput; + int ret; + + /* if the user specified a customised value for this interface, then + * return it directly + */ + throughput = atomic_read(&hard_iface->bat_v.throughput_override); + if (throughput != 0) + return throughput; + + /* if this is a wireless device, then ask its throughput through + * cfg80211 API + */ + if (batadv_is_wifi_netdev(hard_iface->net_dev)) { + if (hard_iface->net_dev->ieee80211_ptr) { + ret = cfg80211_get_station(hard_iface->net_dev, + neigh->addr, &sinfo); + if (ret == -ENOENT) { + /* Node is not associated anymore! It would be + * possible to delete this neighbor. For now set + * the throughput metric to 0. + */ + return 0; + } + if (!ret) + return sinfo.expected_throughput / 100; + } + + /* unsupported WiFi driver version */ + goto default_throughput; + } + + /* if not a wifi interface, check if this device provides data via + * ethtool (e.g. an Ethernet adapter) + */ + memset(&link_settings, 0, sizeof(link_settings)); + rtnl_lock(); + ret = __ethtool_get_link_ksettings(hard_iface->net_dev, &link_settings); + rtnl_unlock(); + if (ret == 0) { + /* link characteristics might change over time */ + if (link_settings.base.duplex == DUPLEX_FULL) + hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; + else + hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; + + throughput = link_settings.base.speed; + if (throughput && (throughput != SPEED_UNKNOWN)) + return throughput * 10; + } + +default_throughput: + if (!(hard_iface->bat_v.flags & BATADV_WARNING_DEFAULT)) { + batadv_info(hard_iface->soft_iface, + "WiFi driver or ethtool info does not provide information about link speeds on interface %s, therefore defaulting to hardcoded throughput values of %u.%1u Mbps. Consider overriding the throughput manually or checking your driver.\n", + hard_iface->net_dev->name, + BATADV_THROUGHPUT_DEFAULT_VALUE / 10, + BATADV_THROUGHPUT_DEFAULT_VALUE % 10); + hard_iface->bat_v.flags |= BATADV_WARNING_DEFAULT; + } + + /* if none of the above cases apply, return the base_throughput */ + return BATADV_THROUGHPUT_DEFAULT_VALUE; +} + +/** + * batadv_v_elp_throughput_metric_update - worker updating the throughput metric + * of a single hop neighbour + * @work: the work queue item + */ +void batadv_v_elp_throughput_metric_update(struct work_struct *work) +{ + struct batadv_hardif_neigh_node_bat_v *neigh_bat_v; + struct batadv_hardif_neigh_node *neigh; + + neigh_bat_v = container_of(work, struct batadv_hardif_neigh_node_bat_v, + metric_work); + neigh = container_of(neigh_bat_v, struct batadv_hardif_neigh_node, + bat_v); + + ewma_throughput_add(&neigh->bat_v.throughput, + batadv_v_elp_get_throughput(neigh)); + + /* decrement refcounter to balance increment performed before scheduling + * this task + */ + batadv_hardif_neigh_put(neigh); +} + +/** + * batadv_v_elp_wifi_neigh_probe - send link probing packets to a neighbour + * @neigh: the neighbour to probe + * + * Sends a predefined number of unicast wifi packets to a given neighbour in + * order to trigger the throughput estimation on this link by the RC algorithm. + * Packets are sent only if there there is not enough payload unicast traffic + * towards this neighbour.. + * + * Return: True on success and false in case of error during skb preparation. + */ +static bool +batadv_v_elp_wifi_neigh_probe(struct batadv_hardif_neigh_node *neigh) +{ + struct batadv_hard_iface *hard_iface = neigh->if_incoming; + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + unsigned long last_tx_diff; + struct sk_buff *skb; + int probe_len, i; + int elp_skb_len; + + /* this probing routine is for Wifi neighbours only */ + if (!batadv_is_wifi_netdev(hard_iface->net_dev)) + return true; + + /* probe the neighbor only if no unicast packets have been sent + * to it in the last 100 milliseconds: this is the rate control + * algorithm sampling interval (minstrel). In this way, if not + * enough traffic has been sent to the neighbor, batman-adv can + * generate 2 probe packets and push the RC algorithm to perform + * the sampling + */ + last_tx_diff = jiffies_to_msecs(jiffies - neigh->bat_v.last_unicast_tx); + if (last_tx_diff <= BATADV_ELP_PROBE_MAX_TX_DIFF) + return true; + + probe_len = max_t(int, sizeof(struct batadv_elp_packet), + BATADV_ELP_MIN_PROBE_SIZE); + + for (i = 0; i < BATADV_ELP_PROBES_PER_NODE; i++) { + elp_skb_len = hard_iface->bat_v.elp_skb->len; + skb = skb_copy_expand(hard_iface->bat_v.elp_skb, 0, + probe_len - elp_skb_len, + GFP_ATOMIC); + if (!skb) + return false; + + /* Tell the skb to get as big as the allocated space (we want + * the packet to be exactly of that size to make the link + * throughput estimation effective. + */ + skb_put(skb, probe_len - hard_iface->bat_v.elp_skb->len); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending unicast (probe) ELP packet on interface %s to %pM\n", + hard_iface->net_dev->name, neigh->addr); + + batadv_send_skb_packet(skb, hard_iface, neigh->addr); + } + + return true; +} + +/** + * batadv_v_elp_periodic_work - ELP periodic task per interface + * @work: work queue item + * + * Emits broadcast ELP message in regular intervals. + */ +static void batadv_v_elp_periodic_work(struct work_struct *work) +{ + struct batadv_hardif_neigh_node *hardif_neigh; + struct batadv_hard_iface *hard_iface; + struct batadv_hard_iface_bat_v *bat_v; + struct batadv_elp_packet *elp_packet; + struct batadv_priv *bat_priv; + struct sk_buff *skb; + u32 elp_interval; + + bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); + hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); + bat_priv = netdev_priv(hard_iface->soft_iface); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) + goto out; + + /* we are in the process of shutting this interface down */ + if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || + (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) + goto out; + + /* the interface was enabled but may not be ready yet */ + if (hard_iface->if_status != BATADV_IF_ACTIVE) + goto restart_timer; + + skb = skb_copy(hard_iface->bat_v.elp_skb, GFP_ATOMIC); + if (!skb) + goto restart_timer; + + elp_packet = (struct batadv_elp_packet *)skb->data; + elp_packet->seqno = htonl(atomic_read(&hard_iface->bat_v.elp_seqno)); + elp_interval = atomic_read(&hard_iface->bat_v.elp_interval); + elp_packet->elp_interval = htonl(elp_interval); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending broadcast ELP packet on interface %s, seqno %u\n", + hard_iface->net_dev->name, + atomic_read(&hard_iface->bat_v.elp_seqno)); + + batadv_send_broadcast_skb(skb, hard_iface); + + atomic_inc(&hard_iface->bat_v.elp_seqno); + + /* The throughput metric is updated on each sent packet. This way, if a + * node is dead and no longer sends packets, batman-adv is still able to + * react timely to its death. + * + * The throughput metric is updated by following these steps: + * 1) if the hard_iface is wifi => send a number of unicast ELPs for + * probing/sampling to each neighbor + * 2) update the throughput metric value of each neighbor (note that the + * value retrieved in this step might be 100ms old because the + * probing packets at point 1) could still be in the HW queue) + */ + rcu_read_lock(); + hlist_for_each_entry_rcu(hardif_neigh, &hard_iface->neigh_list, list) { + if (!batadv_v_elp_wifi_neigh_probe(hardif_neigh)) + /* if something goes wrong while probing, better to stop + * sending packets immediately and reschedule the task + */ + break; + + if (!kref_get_unless_zero(&hardif_neigh->refcount)) + continue; + + /* Reading the estimated throughput from cfg80211 is a task that + * may sleep and that is not allowed in an rcu protected + * context. Therefore schedule a task for that. + */ + queue_work(batadv_event_workqueue, + &hardif_neigh->bat_v.metric_work); + } + rcu_read_unlock(); + +restart_timer: + batadv_v_elp_start_timer(hard_iface); +out: + return; +} + +/** + * batadv_v_elp_iface_enable - setup the ELP interface private resources + * @hard_iface: interface for which the data has to be prepared + * + * Return: 0 on success or a -ENOMEM in case of failure. + */ +int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface) +{ + struct batadv_elp_packet *elp_packet; + unsigned char *elp_buff; + u32 random_seqno; + size_t size; + int res = -ENOMEM; + + size = ETH_HLEN + NET_IP_ALIGN + BATADV_ELP_HLEN; + hard_iface->bat_v.elp_skb = dev_alloc_skb(size); + if (!hard_iface->bat_v.elp_skb) + goto out; + + skb_reserve(hard_iface->bat_v.elp_skb, ETH_HLEN + NET_IP_ALIGN); + elp_buff = skb_push(hard_iface->bat_v.elp_skb, BATADV_ELP_HLEN); + elp_packet = (struct batadv_elp_packet *)elp_buff; + memset(elp_packet, 0, BATADV_ELP_HLEN); + + elp_packet->packet_type = BATADV_ELP; + elp_packet->version = BATADV_COMPAT_VERSION; + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&hard_iface->bat_v.elp_seqno, random_seqno); + atomic_set(&hard_iface->bat_v.elp_interval, 500); + + /* assume full-duplex by default */ + hard_iface->bat_v.flags |= BATADV_FULL_DUPLEX; + + /* warn the user (again) if there is no throughput data is available */ + hard_iface->bat_v.flags &= ~BATADV_WARNING_DEFAULT; + + if (batadv_is_wifi_netdev(hard_iface->net_dev)) + hard_iface->bat_v.flags &= ~BATADV_FULL_DUPLEX; + + INIT_DELAYED_WORK(&hard_iface->bat_v.elp_wq, + batadv_v_elp_periodic_work); + batadv_v_elp_start_timer(hard_iface); + res = 0; + +out: + return res; +} + +/** + * batadv_v_elp_iface_disable - release ELP interface private resources + * @hard_iface: interface for which the resources have to be released + */ +void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface) +{ + cancel_delayed_work_sync(&hard_iface->bat_v.elp_wq); + + dev_kfree_skb(hard_iface->bat_v.elp_skb); + hard_iface->bat_v.elp_skb = NULL; +} + +/** + * batadv_v_elp_primary_iface_set - change internal data to reflect the new + * primary interface + * @primary_iface: the new primary interface + */ +void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface) +{ + struct batadv_hard_iface *hard_iface; + struct batadv_elp_packet *elp_packet; + struct sk_buff *skb; + + /* update orig field of every elp iface belonging to this mesh */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (primary_iface->soft_iface != hard_iface->soft_iface) + continue; + + if (!hard_iface->bat_v.elp_skb) + continue; + + skb = hard_iface->bat_v.elp_skb; + elp_packet = (struct batadv_elp_packet *)skb->data; + ether_addr_copy(elp_packet->orig, + primary_iface->net_dev->dev_addr); + } + rcu_read_unlock(); +} + +/** + * batadv_v_elp_neigh_update - update an ELP neighbour node + * @bat_priv: the bat priv with all the soft interface information + * @neigh_addr: the neighbour interface address + * @if_incoming: the interface the packet was received through + * @elp_packet: the received ELP packet + * + * Updates the ELP neighbour node state with the data received within the new + * ELP packet. + */ +static void batadv_v_elp_neigh_update(struct batadv_priv *bat_priv, + u8 *neigh_addr, + struct batadv_hard_iface *if_incoming, + struct batadv_elp_packet *elp_packet) + +{ + struct batadv_neigh_node *neigh; + struct batadv_orig_node *orig_neigh; + struct batadv_hardif_neigh_node *hardif_neigh; + s32 seqno_diff; + s32 elp_latest_seqno; + + orig_neigh = batadv_v_ogm_orig_get(bat_priv, elp_packet->orig); + if (!orig_neigh) + return; + + neigh = batadv_neigh_node_new(orig_neigh, if_incoming, neigh_addr); + if (!neigh) + goto orig_free; + + hardif_neigh = batadv_hardif_neigh_get(if_incoming, neigh_addr); + if (!hardif_neigh) + goto neigh_free; + + elp_latest_seqno = hardif_neigh->bat_v.elp_latest_seqno; + seqno_diff = ntohl(elp_packet->seqno) - elp_latest_seqno; + + /* known or older sequence numbers are ignored. However always adopt + * if the router seems to have been restarted. + */ + if (seqno_diff < 1 && seqno_diff > -BATADV_ELP_MAX_AGE) + goto hardif_free; + + neigh->last_seen = jiffies; + hardif_neigh->last_seen = jiffies; + hardif_neigh->bat_v.elp_latest_seqno = ntohl(elp_packet->seqno); + hardif_neigh->bat_v.elp_interval = ntohl(elp_packet->elp_interval); + +hardif_free: + if (hardif_neigh) + batadv_hardif_neigh_put(hardif_neigh); +neigh_free: + if (neigh) + batadv_neigh_node_put(neigh); +orig_free: + if (orig_neigh) + batadv_orig_node_put(orig_neigh); +} + +/** + * batadv_v_elp_packet_recv - main ELP packet handler + * @skb: the received packet + * @if_incoming: the interface this packet was received through + * + * Return: NET_RX_SUCCESS and consumes the skb if the packet was peoperly + * processed or NET_RX_DROP in case of failure. + */ +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_elp_packet *elp_packet; + struct batadv_hard_iface *primary_if; + struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); + bool ret; + + ret = batadv_check_management_packet(skb, if_incoming, BATADV_ELP_HLEN); + if (!ret) + return NET_RX_DROP; + + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + return NET_RX_DROP; + + /* did we receive a B.A.T.M.A.N. V ELP packet on an interface + * that does not have B.A.T.M.A.N. V ELP enabled ? + */ + if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0) + return NET_RX_DROP; + + elp_packet = (struct batadv_elp_packet *)skb->data; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received ELP packet from %pM seqno %u ORIG: %pM\n", + ethhdr->h_source, ntohl(elp_packet->seqno), + elp_packet->orig); + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + batadv_v_elp_neigh_update(bat_priv, ethhdr->h_source, if_incoming, + elp_packet); + +out: + if (primary_if) + batadv_hardif_put(primary_if); + consume_skb(skb); + return NET_RX_SUCCESS; +} diff --git a/net/batman-adv/bat_v_elp.h b/net/batman-adv/bat_v_elp.h new file mode 100644 index 000000000000..e95f1bca0785 --- /dev/null +++ b/net/batman-adv/bat_v_elp.h @@ -0,0 +1,33 @@ +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: + * + * Linus Lüssing, Marek Lindner + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "main.h" + +#ifndef _NET_BATMAN_ADV_BAT_V_ELP_H_ +#define _NET_BATMAN_ADV_BAT_V_ELP_H_ + +struct sk_buff; +struct work_struct; + +int batadv_v_elp_iface_enable(struct batadv_hard_iface *hard_iface); +void batadv_v_elp_iface_disable(struct batadv_hard_iface *hard_iface); +void batadv_v_elp_primary_iface_set(struct batadv_hard_iface *primary_iface); +int batadv_v_elp_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming); +void batadv_v_elp_throughput_metric_update(struct work_struct *work); + +#endif /* _NET_BATMAN_ADV_BAT_V_ELP_H_ */ diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c new file mode 100644 index 000000000000..d9bcbe6e7d65 --- /dev/null +++ b/net/batman-adv/bat_v_ogm.c @@ -0,0 +1,833 @@ +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "bat_v_ogm.h" +#include "main.h" + +#include <linux/atomic.h> +#include <linux/byteorder/generic.h> +#include <linux/errno.h> +#include <linux/etherdevice.h> +#include <linux/fs.h> +#include <linux/if_ether.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/random.h> +#include <linux/rculist.h> +#include <linux/rcupdate.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/workqueue.h> + +#include "hard-interface.h" +#include "hash.h" +#include "originator.h" +#include "packet.h" +#include "routing.h" +#include "send.h" +#include "translation-table.h" + +/** + * batadv_v_ogm_orig_get - retrieve and possibly create an originator node + * @bat_priv: the bat priv with all the soft interface information + * @addr: the address of the originator + * + * Return: the orig_node corresponding to the specified address. If such object + * does not exist it is allocated here. In case of allocation failure returns + * NULL. + */ +struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, + const u8 *addr) +{ + struct batadv_orig_node *orig_node; + int hash_added; + + orig_node = batadv_orig_hash_find(bat_priv, addr); + if (orig_node) + return orig_node; + + orig_node = batadv_orig_node_new(bat_priv, addr); + if (!orig_node) + return NULL; + + hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig, + batadv_choose_orig, orig_node, + &orig_node->hash_entry); + if (hash_added != 0) { + /* orig_node->refcounter is initialised to 2 by + * batadv_orig_node_new() + */ + batadv_orig_node_put(orig_node); + batadv_orig_node_put(orig_node); + orig_node = NULL; + } + + return orig_node; +} + +/** + * batadv_v_ogm_start_timer - restart the OGM sending timer + * @bat_priv: the bat priv with all the soft interface information + */ +static void batadv_v_ogm_start_timer(struct batadv_priv *bat_priv) +{ + unsigned long msecs; + /* this function may be invoked in different contexts (ogm rescheduling + * or hard_iface activation), but the work timer should not be reset + */ + if (delayed_work_pending(&bat_priv->bat_v.ogm_wq)) + return; + + msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; + msecs += prandom_u32() % (2 * BATADV_JITTER); + queue_delayed_work(batadv_event_workqueue, &bat_priv->bat_v.ogm_wq, + msecs_to_jiffies(msecs)); +} + +/** + * batadv_v_ogm_send_to_if - send a batman ogm using a given interface + * @skb: the OGM to send + * @hard_iface: the interface to use to send the OGM + */ +static void batadv_v_ogm_send_to_if(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + + if (hard_iface->if_status != BATADV_IF_ACTIVE) + return; + + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, + skb->len + ETH_HLEN); + + batadv_send_broadcast_skb(skb, hard_iface); +} + +/** + * batadv_v_ogm_send - periodic worker broadcasting the own OGM + * @work: work queue item + */ +static void batadv_v_ogm_send(struct work_struct *work) +{ + struct batadv_hard_iface *hard_iface; + struct batadv_priv_bat_v *bat_v; + struct batadv_priv *bat_priv; + struct batadv_ogm2_packet *ogm_packet; + struct sk_buff *skb, *skb_tmp; + unsigned char *ogm_buff, *pkt_buff; + int ogm_buff_len; + u16 tvlv_len = 0; + + bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); + bat_priv = container_of(bat_v, struct batadv_priv, bat_v); + + if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) + goto out; + + ogm_buff = bat_priv->bat_v.ogm_buff; + ogm_buff_len = bat_priv->bat_v.ogm_buff_len; + /* tt changes have to be committed before the tvlv data is + * appended as it may alter the tt tvlv container + */ + batadv_tt_local_commit_changes(bat_priv); + tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, &ogm_buff, + &ogm_buff_len, + BATADV_OGM2_HLEN); + + bat_priv->bat_v.ogm_buff = ogm_buff; + bat_priv->bat_v.ogm_buff_len = ogm_buff_len; + + skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + ogm_buff_len); + if (!skb) + goto reschedule; + + skb_reserve(skb, ETH_HLEN); + pkt_buff = skb_put(skb, ogm_buff_len); + memcpy(pkt_buff, ogm_buff, ogm_buff_len); + + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + ogm_packet->seqno = htonl(atomic_read(&bat_priv->bat_v.ogm_seqno)); + atomic_inc(&bat_priv->bat_v.ogm_seqno); + ogm_packet->tvlv_len = htons(tvlv_len); + + /* broadcast on every interface */ + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Sending own OGM2 packet (originator %pM, seqno %u, throughput %u, TTL %d) on interface %s [%pM]\n", + ogm_packet->orig, ntohl(ogm_packet->seqno), + ntohl(ogm_packet->throughput), ogm_packet->ttl, + hard_iface->net_dev->name, + hard_iface->net_dev->dev_addr); + + /* this skb gets consumed by batadv_v_ogm_send_to_if() */ + skb_tmp = skb_clone(skb, GFP_ATOMIC); + if (!skb_tmp) + break; + + batadv_v_ogm_send_to_if(skb_tmp, hard_iface); + } + rcu_read_unlock(); + + consume_skb(skb); + +reschedule: + batadv_v_ogm_start_timer(bat_priv); +out: + return; +} + +/** + * batadv_v_ogm_iface_enable - prepare an interface for B.A.T.M.A.N. V + * @hard_iface: the interface to prepare + * + * Takes care of scheduling own OGM sending routine for this interface. + * + * Return: 0 on success or a negative error code otherwise + */ +int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + + batadv_v_ogm_start_timer(bat_priv); + + return 0; +} + +/** + * batadv_v_ogm_primary_iface_set - set a new primary interface + * @primary_iface: the new primary interface + */ +void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); + struct batadv_ogm2_packet *ogm_packet; + + if (!bat_priv->bat_v.ogm_buff) + return; + + ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; + ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); +} + +/** + * batadv_v_ogm_orig_update - update the originator status based on the received + * OGM + * @bat_priv: the bat priv with all the soft interface information + * @orig_node: the originator to update + * @neigh_node: the neighbour the OGM has been received from (to update) + * @ogm2: the received OGM + * @if_outgoing: the interface where this OGM is going to be forwarded through + */ +static void +batadv_v_ogm_orig_update(struct batadv_priv *bat_priv, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + const struct batadv_ogm2_packet *ogm2, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_ifinfo *router_ifinfo = NULL, *neigh_ifinfo = NULL; + struct batadv_neigh_node *router = NULL; + s32 neigh_seq_diff; + u32 neigh_last_seqno; + u32 router_last_seqno; + u32 router_throughput, neigh_throughput; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Searching and updating originator entry of received packet\n"); + + /* if this neighbor already is our next hop there is nothing + * to change + */ + router = batadv_orig_router_get(orig_node, if_outgoing); + if (router == neigh_node) + goto out; + + /* don't consider neighbours with worse throughput. + * also switch route if this seqno is BATADV_V_MAX_ORIGDIFF newer than + * the last received seqno from our best next hop. + */ + if (router) { + router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing); + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + + /* if these are not allocated, something is wrong. */ + if (!router_ifinfo || !neigh_ifinfo) + goto out; + + neigh_last_seqno = neigh_ifinfo->bat_v.last_seqno; + router_last_seqno = router_ifinfo->bat_v.last_seqno; + neigh_seq_diff = neigh_last_seqno - router_last_seqno; + router_throughput = router_ifinfo->bat_v.throughput; + neigh_throughput = neigh_ifinfo->bat_v.throughput; + + if ((neigh_seq_diff < BATADV_OGM_MAX_ORIGDIFF) && + (router_throughput >= neigh_throughput)) + goto out; + } + + batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node); + +out: + if (router_ifinfo) + batadv_neigh_ifinfo_put(router_ifinfo); + if (neigh_ifinfo) + batadv_neigh_ifinfo_put(neigh_ifinfo); + if (router) + batadv_neigh_node_put(router); +} + +/** + * batadv_v_forward_penalty - apply a penalty to the throughput metric forwarded + * with B.A.T.M.A.N. V OGMs + * @bat_priv: the bat priv with all the soft interface information + * @if_incoming: the interface where the OGM has been received + * @if_outgoing: the interface where the OGM has to be forwarded to + * @throughput: the current throughput + * + * Apply a penalty on the current throughput metric value based on the + * characteristic of the interface where the OGM has been received. The return + * value is computed as follows: + * - throughput * 50% if the incoming and outgoing interface are the + * same WiFi interface and the throughput is above + * 1MBit/s + * - throughput if the outgoing interface is the default + * interface (i.e. this OGM is processed for the + * internal table and not forwarded) + * - throughput * hop penalty otherwise + * + * Return: the penalised throughput metric. + */ +static u32 batadv_v_forward_penalty(struct batadv_priv *bat_priv, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing, + u32 throughput) +{ + int hop_penalty = atomic_read(&bat_priv->hop_penalty); + int hop_penalty_max = BATADV_TQ_MAX_VALUE; + + /* Don't apply hop penalty in default originator table. */ + if (if_outgoing == BATADV_IF_DEFAULT) + return throughput; + + /* Forwarding on the same WiFi interface cuts the throughput in half + * due to the store & forward characteristics of WIFI. + * Very low throughput values are the exception. + */ + if ((throughput > 10) && + (if_incoming == if_outgoing) && + !(if_incoming->bat_v.flags & BATADV_FULL_DUPLEX)) + return throughput / 2; + + /* hop penalty of 255 equals 100% */ + return throughput * (hop_penalty_max - hop_penalty) / hop_penalty_max; +} + +/** + * batadv_v_ogm_forward - forward an OGM to the given outgoing interface + * @bat_priv: the bat priv with all the soft interface information + * @ogm_received: previously received OGM to be forwarded + * @throughput: throughput to announce, may vary per outgoing interface + * @if_incoming: the interface on which this OGM was received on + * @if_outgoing: the interface to which the OGM has to be forwarded to + * + * Forward an OGM to an interface after having altered the throughput metric and + * the TTL value contained in it. The original OGM isn't modified. + */ +static void batadv_v_ogm_forward(struct batadv_priv *bat_priv, + const struct batadv_ogm2_packet *ogm_received, + u32 throughput, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_ogm2_packet *ogm_forward; + unsigned char *skb_buff; + struct sk_buff *skb; + size_t packet_len; + u16 tvlv_len; + + if (ogm_received->ttl <= 1) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); + return; + } + + tvlv_len = ntohs(ogm_received->tvlv_len); + + packet_len = BATADV_OGM2_HLEN + tvlv_len; + skb = netdev_alloc_skb_ip_align(if_outgoing->net_dev, + ETH_HLEN + packet_len); + if (!skb) + return; + + skb_reserve(skb, ETH_HLEN); + skb_buff = skb_put(skb, packet_len); + memcpy(skb_buff, ogm_received, packet_len); + + /* apply forward penalty */ + ogm_forward = (struct batadv_ogm2_packet *)skb_buff; + ogm_forward->throughput = htonl(throughput); + ogm_forward->ttl--; + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Forwarding OGM2 packet on %s: throughput %u, ttl %u, received via %s\n", + if_outgoing->net_dev->name, throughput, ogm_forward->ttl, + if_incoming->net_dev->name); + + batadv_v_ogm_send_to_if(skb, if_outgoing); +} + +/** + * batadv_v_ogm_metric_update - update route metric based on OGM + * @bat_priv: the bat priv with all the soft interface information + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + * + * Return: + * 1 if the OGM is new, + * 0 if it is not new but valid, + * <0 on error (e.g. old OGM) + */ +static int batadv_v_ogm_metric_update(struct batadv_priv *bat_priv, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_orig_ifinfo *orig_ifinfo = NULL; + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; + bool protection_started = false; + int ret = -EINVAL; + u32 path_throughput; + s32 seq_diff; + + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (!orig_ifinfo) + goto out; + + seq_diff = ntohl(ogm2->seqno) - orig_ifinfo->last_real_seqno; + + if (!hlist_empty(&orig_node->neigh_list) && + batadv_window_protected(bat_priv, seq_diff, + BATADV_OGM_MAX_AGE, + &orig_ifinfo->batman_seqno_reset, + &protection_started)) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: packet within window protection time from %pM\n", + ogm2->orig); + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Last reset: %ld, %ld\n", + orig_ifinfo->batman_seqno_reset, jiffies); + goto out; + } + + /* drop packets with old seqnos, however accept the first packet after + * a host has been rebooted. + */ + if ((seq_diff < 0) && !protection_started) + goto out; + + neigh_node->last_seen = jiffies; + + orig_node->last_seen = jiffies; + + orig_ifinfo->last_real_seqno = ntohl(ogm2->seqno); + orig_ifinfo->last_ttl = ogm2->ttl; + + neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing); + if (!neigh_ifinfo) + goto out; + + path_throughput = batadv_v_forward_penalty(bat_priv, if_incoming, + if_outgoing, + ntohl(ogm2->throughput)); + neigh_ifinfo->bat_v.throughput = path_throughput; + neigh_ifinfo->bat_v.last_seqno = ntohl(ogm2->seqno); + neigh_ifinfo->last_ttl = ogm2->ttl; + + if (seq_diff > 0 || protection_started) + ret = 1; + else + ret = 0; +out: + if (orig_ifinfo) + batadv_orig_ifinfo_put(orig_ifinfo); + if (neigh_ifinfo) + batadv_neigh_ifinfo_put(neigh_ifinfo); + + return ret; +} + +/** + * batadv_v_ogm_route_update - update routes based on OGM + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: the Ethernet header of the OGM2 + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + */ +static void batadv_v_ogm_route_update(struct batadv_priv *bat_priv, + const struct ethhdr *ethhdr, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + struct batadv_neigh_node *router = NULL; + struct batadv_neigh_ifinfo *neigh_ifinfo = NULL; + struct batadv_orig_node *orig_neigh_node = NULL; + struct batadv_orig_ifinfo *orig_ifinfo = NULL; + struct batadv_neigh_node *orig_neigh_router = NULL; + + neigh_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing); + if (!neigh_ifinfo) + goto out; + + orig_neigh_node = batadv_v_ogm_orig_get(bat_priv, ethhdr->h_source); + if (!orig_neigh_node) + goto out; + + orig_neigh_router = batadv_orig_router_get(orig_neigh_node, + if_outgoing); + + /* drop packet if sender is not a direct neighbor and if we + * don't route towards it + */ + router = batadv_orig_router_get(orig_node, if_outgoing); + if (router && router->orig_node != orig_node && !orig_neigh_router) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + goto out; + } + + if (router) + batadv_neigh_node_put(router); + + /* Update routes, and check if the OGM is from the best next hop */ + batadv_v_ogm_orig_update(bat_priv, orig_node, neigh_node, ogm2, + if_outgoing); + + orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing); + if (!orig_ifinfo) + goto out; + + /* don't forward the same seqno twice on one interface */ + if (orig_ifinfo->last_seqno_forwarded == ntohl(ogm2->seqno)) + goto out; + + /* acquire possibly updated router */ + router = batadv_orig_router_get(orig_node, if_outgoing); + + /* strict rule: forward packets coming from the best next hop only */ + if (neigh_node != router) + goto out; + + /* only forward for specific interface, not for the default one. */ + if (if_outgoing != BATADV_IF_DEFAULT) { + orig_ifinfo->last_seqno_forwarded = ntohl(ogm2->seqno); + batadv_v_ogm_forward(bat_priv, ogm2, + neigh_ifinfo->bat_v.throughput, + if_incoming, if_outgoing); + } + +out: + if (orig_ifinfo) + batadv_orig_ifinfo_put(orig_ifinfo); + if (router) + batadv_neigh_node_put(router); + if (orig_neigh_router) + batadv_neigh_node_put(orig_neigh_router); + if (orig_neigh_node) + batadv_orig_node_put(orig_neigh_node); + if (neigh_ifinfo) + batadv_neigh_ifinfo_put(neigh_ifinfo); +} + +/** + * batadv_v_ogm_process_per_outif - process a batman v OGM for an outgoing if + * @bat_priv: the bat priv with all the soft interface information + * @ethhdr: the Ethernet header of the OGM2 + * @ogm2: OGM2 structure + * @orig_node: Originator structure for which the OGM has been received + * @neigh_node: the neigh_node through with the OGM has been received + * @if_incoming: the interface where this packet was received + * @if_outgoing: the interface for which the packet should be considered + */ +static void +batadv_v_ogm_process_per_outif(struct batadv_priv *bat_priv, + const struct ethhdr *ethhdr, + const struct batadv_ogm2_packet *ogm2, + struct batadv_orig_node *orig_node, + struct batadv_neigh_node *neigh_node, + struct batadv_hard_iface *if_incoming, + struct batadv_hard_iface *if_outgoing) +{ + int seqno_age; + + /* first, update the metric with according sanity checks */ + seqno_age = batadv_v_ogm_metric_update(bat_priv, ogm2, orig_node, + neigh_node, if_incoming, + if_outgoing); + + /* outdated sequence numbers are to be discarded */ + if (seqno_age < 0) + return; + + /* only unknown & newer OGMs contain TVLVs we are interested in */ + if ((seqno_age > 0) && (if_outgoing == BATADV_IF_DEFAULT)) + batadv_tvlv_containers_process(bat_priv, true, orig_node, + NULL, NULL, + (unsigned char *)(ogm2 + 1), + ntohs(ogm2->tvlv_len)); + + /* if the metric update went through, update routes if needed */ + batadv_v_ogm_route_update(bat_priv, ethhdr, ogm2, orig_node, + neigh_node, if_incoming, if_outgoing); +} + +/** + * batadv_v_ogm_aggr_packet - checks if there is another OGM aggregated + * @buff_pos: current position in the skb + * @packet_len: total length of the skb + * @tvlv_len: tvlv length of the previously considered OGM + * + * Return: true if there is enough space for another OGM, false otherwise. + */ +static bool batadv_v_ogm_aggr_packet(int buff_pos, int packet_len, + __be16 tvlv_len) +{ + int next_buff_pos = 0; + + next_buff_pos += buff_pos + BATADV_OGM2_HLEN; + next_buff_pos += ntohs(tvlv_len); + + return (next_buff_pos <= packet_len) && + (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); +} + +/** + * batadv_v_ogm_process - process an incoming batman v OGM + * @skb: the skb containing the OGM + * @ogm_offset: offset to the OGM which should be processed (for aggregates) + * @if_incoming: the interface where this packet was receved + */ +static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct ethhdr *ethhdr; + struct batadv_orig_node *orig_node = NULL; + struct batadv_hardif_neigh_node *hardif_neigh = NULL; + struct batadv_neigh_node *neigh_node = NULL; + struct batadv_hard_iface *hard_iface; + struct batadv_ogm2_packet *ogm_packet; + u32 ogm_throughput, link_throughput, path_throughput; + + ethhdr = eth_hdr(skb); + ogm_packet = (struct batadv_ogm2_packet *)(skb->data + ogm_offset); + + ogm_throughput = ntohl(ogm_packet->throughput); + + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Received OGM2 packet via NB: %pM, IF: %s [%pM] (from OG: %pM, seqno %u, troughput %u, TTL %u, V %u, tvlv_len %u)\n", + ethhdr->h_source, if_incoming->net_dev->name, + if_incoming->net_dev->dev_addr, ogm_packet->orig, + ntohl(ogm_packet->seqno), ogm_throughput, ogm_packet->ttl, + ogm_packet->version, ntohs(ogm_packet->tvlv_len)); + + /* If the troughput metric is 0, immediately drop the packet. No need to + * create orig_node / neigh_node for an unusable route. + */ + if (ogm_throughput == 0) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: originator packet with troughput metric of 0\n"); + return; + } + + /* require ELP packets be to received from this neighbor first */ + hardif_neigh = batadv_hardif_neigh_get(if_incoming, ethhdr->h_source); + if (!hardif_neigh) { + batadv_dbg(BATADV_DBG_BATMAN, bat_priv, + "Drop packet: OGM via unknown neighbor!\n"); + goto out; + } + + orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig); + if (!orig_node) + return; + + neigh_node = batadv_neigh_node_new(orig_node, if_incoming, + ethhdr->h_source); + if (!neigh_node) + goto out; + + /* Update the received throughput metric to match the link + * characteristic: + * - If this OGM traveled one hop so far (emitted by single hop + * neighbor) the path throughput metric equals the link throughput. + * - For OGMs traversing more than hop the path throughput metric is + * the smaller of the path throughput and the link throughput. + */ + link_throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput); + path_throughput = min_t(u32, link_throughput, ogm_throughput); + ogm_packet->throughput = htonl(path_throughput); + + batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, orig_node, + neigh_node, if_incoming, + BATADV_IF_DEFAULT); + + rcu_read_lock(); + list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { + if (hard_iface->if_status != BATADV_IF_ACTIVE) + continue; + + if (hard_iface->soft_iface != bat_priv->soft_iface) + continue; + + batadv_v_ogm_process_per_outif(bat_priv, ethhdr, ogm_packet, + orig_node, neigh_node, + if_incoming, hard_iface); + } + rcu_read_unlock(); +out: + if (orig_node) + batadv_orig_node_put(orig_node); + if (neigh_node) + batadv_neigh_node_put(neigh_node); + if (hardif_neigh) + batadv_hardif_neigh_put(hardif_neigh); +} + +/** + * batadv_v_ogm_packet_recv - OGM2 receiving handler + * @skb: the received OGM + * @if_incoming: the interface where this OGM has been received + * + * Return: NET_RX_SUCCESS and consume the skb on success or returns NET_RX_DROP + * (without freeing the skb) on failure + */ +int batadv_v_ogm_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming) +{ + struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); + struct batadv_ogm2_packet *ogm_packet; + struct ethhdr *ethhdr = eth_hdr(skb); + int ogm_offset; + u8 *packet_pos; + int ret = NET_RX_DROP; + + /* did we receive a OGM2 packet on an interface that does not have + * B.A.T.M.A.N. V enabled ? + */ + if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0) + return NET_RX_DROP; + + if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN)) + return NET_RX_DROP; + + if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) + return NET_RX_DROP; + + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + + if (batadv_is_my_mac(bat_priv, ogm_packet->orig)) + return NET_RX_DROP; + + batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); + batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, + skb->len + ETH_HLEN); + + ogm_offset = 0; + ogm_packet = (struct batadv_ogm2_packet *)skb->data; + + while (batadv_v_ogm_aggr_packet(ogm_offset, skb_headlen(skb), + ogm_packet->tvlv_len)) { + batadv_v_ogm_process(skb, ogm_offset, if_incoming); + + ogm_offset += BATADV_OGM2_HLEN; + ogm_offset += ntohs(ogm_packet->tvlv_len); + + packet_pos = skb->data + ogm_offset; + ogm_packet = (struct batadv_ogm2_packet *)packet_pos; + } + + ret = NET_RX_SUCCESS; + consume_skb(skb); + + return ret; +} + +/** + * batadv_v_ogm_init - initialise the OGM2 engine + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or a negative error code in case of failure + */ +int batadv_v_ogm_init(struct batadv_priv *bat_priv) +{ + struct batadv_ogm2_packet *ogm_packet; + unsigned char *ogm_buff; + u32 random_seqno; + + bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; + ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); + if (!ogm_buff) + return -ENOMEM; + + bat_priv->bat_v.ogm_buff = ogm_buff; + ogm_packet = (struct batadv_ogm2_packet *)ogm_buff; + ogm_packet->packet_type = BATADV_OGM2; + ogm_packet->version = BATADV_COMPAT_VERSION; + ogm_packet->ttl = BATADV_TTL; + ogm_packet->flags = BATADV_NO_FLAGS; + ogm_packet->throughput = htonl(BATADV_THROUGHPUT_MAX_VALUE); + + /* randomize initial seqno to avoid collision */ + get_random_bytes(&random_seqno, sizeof(random_seqno)); + atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); + INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send); + + return 0; +} + +/** + * batadv_v_ogm_free - free OGM private resources + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_v_ogm_free(struct batadv_priv *bat_priv) +{ + cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq); + + kfree(bat_priv->bat_v.ogm_buff); + bat_priv->bat_v.ogm_buff = NULL; + bat_priv->bat_v.ogm_buff_len = 0; +} diff --git a/net/batman-adv/bat_v_ogm.h b/net/batman-adv/bat_v_ogm.h new file mode 100644 index 000000000000..d849c75ada0e --- /dev/null +++ b/net/batman-adv/bat_v_ogm.h @@ -0,0 +1,36 @@ +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: + * + * Antonio Quartulli + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef _BATMAN_ADV_BATADV_V_OGM_H_ +#define _BATMAN_ADV_BATADV_V_OGM_H_ + +#include <linux/types.h> + +struct batadv_hard_iface; +struct batadv_priv; +struct sk_buff; + +int batadv_v_ogm_init(struct batadv_priv *bat_priv); +void batadv_v_ogm_free(struct batadv_priv *bat_priv); +int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface); +struct batadv_orig_node *batadv_v_ogm_orig_get(struct batadv_priv *bat_priv, + const u8 *addr); +void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface); +int batadv_v_ogm_packet_recv(struct sk_buff *skb, + struct batadv_hard_iface *if_incoming); + +#endif /* _BATMAN_ADV_BATADV_V_OGM_H_ */ diff --git a/net/batman-adv/bitarray.c b/net/batman-adv/bitarray.c index 25cbc36e997a..b56bb000a0ab 100644 --- a/net/batman-adv/bitarray.c +++ b/net/batman-adv/bitarray.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2006-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich, Marek Lindner * @@ -29,10 +29,16 @@ static void batadv_bitmap_shift_left(unsigned long *seq_bits, s32 n) bitmap_shift_left(seq_bits, seq_bits, n, BATADV_TQ_LOCAL_WINDOW_SIZE); } -/* receive and process one packet within the sequence number window. +/** + * batadv_bit_get_packet - receive and process one packet within the sequence + * number window + * @priv: the bat priv with all the soft interface information + * @seq_bits: pointer to the sequence number receive packet + * @seq_num_diff: difference between the current/received sequence number and + * the last sequence number + * @set_mark: whether this packet should be marked in seq_bits * - * returns: - * 1 if the window was moved (either new or very old) + * Return: 1 if the window was moved (either new or very old), * 0 if the window was not moved/shifted. */ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff, diff --git a/net/batman-adv/bitarray.h b/net/batman-adv/bitarray.h index 0226b220fe5b..3e41bb80eb81 100644 --- a/net/batman-adv/bitarray.h +++ b/net/batman-adv/bitarray.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2006-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich, Marek Lindner * @@ -24,7 +24,14 @@ #include <linux/compiler.h> #include <linux/types.h> -/* Returns 1 if the corresponding bit in the given seq_bits indicates true +/** + * batadv_test_bit - check if bit is set in the current window + * + * @seq_bits: pointer to the sequence number receive packet + * @last_seqno: latest sequence number in seq_bits + * @curr_seqno: sequence number to test for + * + * Return: 1 if the corresponding bit in the given seq_bits indicates true * and curr_seqno is within range of last_seqno. Otherwise returns 0. */ static inline int batadv_test_bit(const unsigned long *seq_bits, @@ -48,9 +55,6 @@ static inline void batadv_set_bit(unsigned long *seq_bits, s32 n) set_bit(n, seq_bits); /* turn the position on */ } -/* receive and process one packet, returns 1 if received seq_num is considered - * new, 0 if old - */ int batadv_bit_get_packet(void *priv, unsigned long *seq_bits, s32 seq_num_diff, int set_mark); diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c index c24c481b666f..0a6c8b824a00 100644 --- a/net/batman-adv/bridge_loop_avoidance.c +++ b/net/batman-adv/bridge_loop_avoidance.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich * @@ -31,6 +31,7 @@ #include <linux/jhash.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -58,7 +59,13 @@ static void batadv_bla_send_announce(struct batadv_priv *bat_priv, struct batadv_bla_backbone_gw *backbone_gw); -/* return the index of the claim */ +/** + * batadv_choose_claim - choose the right bucket for a claim. + * @data: data to hash + * @size: size of the hash table + * + * Return: the hash index of the claim + */ static inline u32 batadv_choose_claim(const void *data, u32 size) { struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; @@ -70,7 +77,13 @@ static inline u32 batadv_choose_claim(const void *data, u32 size) return hash % size; } -/* return the index of the backbone gateway */ +/** + * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway. + * @data: data to hash + * @size: size of the hash table + * + * Return: the hash index of the backbone gateway + */ static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) { const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; @@ -82,7 +95,13 @@ static inline u32 batadv_choose_backbone_gw(const void *data, u32 size) return hash % size; } -/* compares address and vid of two backbone gws */ +/** + * batadv_compare_backbone_gw - compare address and vid of two backbone gws + * @node: list node of the first entry to compare + * @data2: pointer to the second backbone gateway + * + * Return: 1 if the backbones have the same data, 0 otherwise + */ static int batadv_compare_backbone_gw(const struct hlist_node *node, const void *data2) { @@ -100,7 +119,13 @@ static int batadv_compare_backbone_gw(const struct hlist_node *node, return 1; } -/* compares address and vid of two claims */ +/** + * batadv_compare_backbone_gw - compare address and vid of two claims + * @node: list node of the first entry to compare + * @data2: pointer to the second claims + * + * Return: 1 if the claim have the same data, 0 otherwise + */ static int batadv_compare_claim(const struct hlist_node *node, const void *data2) { @@ -118,35 +143,62 @@ static int batadv_compare_claim(const struct hlist_node *node, return 1; } -/* free a backbone gw */ -static void -batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw) +/** + * batadv_backbone_gw_release - release backbone gw from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the backbone gw + */ +static void batadv_backbone_gw_release(struct kref *ref) { - if (atomic_dec_and_test(&backbone_gw->refcount)) - kfree_rcu(backbone_gw, rcu); + struct batadv_bla_backbone_gw *backbone_gw; + + backbone_gw = container_of(ref, struct batadv_bla_backbone_gw, + refcount); + + kfree_rcu(backbone_gw, rcu); } -/* finally deinitialize the claim */ -static void batadv_claim_release(struct batadv_bla_claim *claim) +/** + * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly + * release it + * @backbone_gw: backbone gateway to be free'd + */ +static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw) { - batadv_backbone_gw_free_ref(claim->backbone_gw); + kref_put(&backbone_gw->refcount, batadv_backbone_gw_release); +} + +/** + * batadv_claim_release - release claim from lists and queue for free after rcu + * grace period + * @ref: kref pointer of the claim + */ +static void batadv_claim_release(struct kref *ref) +{ + struct batadv_bla_claim *claim; + + claim = container_of(ref, struct batadv_bla_claim, refcount); + + batadv_backbone_gw_put(claim->backbone_gw); kfree_rcu(claim, rcu); } -/* free a claim, call claim_free_rcu if its the last reference */ -static void batadv_claim_free_ref(struct batadv_bla_claim *claim) +/** + * batadv_claim_put - decrement the claim refcounter and possibly + * release it + * @claim: claim to be free'd + */ +static void batadv_claim_put(struct batadv_bla_claim *claim) { - if (atomic_dec_and_test(&claim->refcount)) - batadv_claim_release(claim); + kref_put(&claim->refcount, batadv_claim_release); } /** - * batadv_claim_hash_find + * batadv_claim_hash_find - looks for a claim in the claim hash * @bat_priv: the bat priv with all the soft interface information * @data: search data (may be local/static data) * - * looks for a claim in the hash, and returns it if found - * or NULL otherwise. + * Return: claim if found or NULL otherwise. */ static struct batadv_bla_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv, @@ -169,7 +221,7 @@ static struct batadv_bla_claim if (!batadv_compare_claim(&claim->hash_entry, data)) continue; - if (!atomic_inc_not_zero(&claim->refcount)) + if (!kref_get_unless_zero(&claim->refcount)) continue; claim_tmp = claim; @@ -181,12 +233,12 @@ static struct batadv_bla_claim } /** - * batadv_backbone_hash_find - looks for a claim in the hash + * batadv_backbone_hash_find - looks for a backbone gateway in the hash * @bat_priv: the bat priv with all the soft interface information * @addr: the address of the originator * @vid: the VLAN ID * - * Returns claim if found or NULL otherwise. + * Return: backbone gateway if found or NULL otherwise */ static struct batadv_bla_backbone_gw * batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, @@ -213,7 +265,7 @@ batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, &search_entry)) continue; - if (!atomic_inc_not_zero(&backbone_gw->refcount)) + if (!kref_get_unless_zero(&backbone_gw->refcount)) continue; backbone_gw_tmp = backbone_gw; @@ -224,7 +276,10 @@ batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr, return backbone_gw_tmp; } -/* delete all claims for a backbone */ +/** + * batadv_bla_del_backbone_claims - delete all claims for a backbone + * @backbone_gw: backbone gateway where the claims should be removed + */ static void batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) { @@ -249,7 +304,7 @@ batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) if (claim->backbone_gw != backbone_gw) continue; - batadv_claim_free_ref(claim); + batadv_claim_put(claim); hlist_del_rcu(&claim->hash_entry); } spin_unlock_bh(list_lock); @@ -368,18 +423,17 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac, netif_rx(skb); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** - * batadv_bla_get_backbone_gw + * batadv_bla_get_backbone_gw - finds or creates a backbone gateway * @bat_priv: the bat priv with all the soft interface information * @orig: the mac address of the originator * @vid: the VLAN ID * @own_backbone: set if the requested backbone is local * - * searches for the backbone gw or creates a new one if it could not - * be found. + * Return: the (possibly created) backbone gateway or NULL on error */ static struct batadv_bla_backbone_gw * batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, @@ -412,7 +466,8 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, ether_addr_copy(entry->orig, orig); /* one for the hash, one for returning */ - atomic_set(&entry->refcount, 2); + kref_init(&entry->refcount); + kref_get(&entry->refcount); hash_added = batadv_hash_add(bat_priv->bla.backbone_hash, batadv_compare_backbone_gw, @@ -430,7 +485,7 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, if (orig_node) { batadv_tt_global_del_orig(bat_priv, orig_node, vid, "became a backbone gateway"); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } if (own_backbone) { @@ -445,7 +500,13 @@ batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig, return entry; } -/* update or add the own backbone gw to make sure we announce +/** + * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the selected primary interface + * @vid: VLAN identifier + * + * update or add the own backbone gw to make sure we announce * where we receive other backbone gws */ static void @@ -462,7 +523,7 @@ batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv, return; backbone_gw->lasttime = jiffies; - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); } /** @@ -511,7 +572,7 @@ static void batadv_bla_answer_request(struct batadv_priv *bat_priv, /* finally, send an announcement frame */ batadv_bla_send_announce(bat_priv, backbone_gw); - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); } /** @@ -542,12 +603,9 @@ static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw) } /** - * batadv_bla_send_announce + * batadv_bla_send_announce - Send an announcement frame * @bat_priv: the bat priv with all the soft interface information * @backbone_gw: our backbone gateway which should be announced - * - * This function sends an announcement. It is called from multiple - * places. */ static void batadv_bla_send_announce(struct batadv_priv *bat_priv, struct batadv_bla_backbone_gw *backbone_gw) @@ -595,7 +653,8 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, claim->lasttime = jiffies; claim->backbone_gw = backbone_gw; - atomic_set(&claim->refcount, 2); + kref_init(&claim->refcount); + kref_get(&claim->refcount); batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n", mac, BATADV_PRINT_VID(vid)); @@ -622,10 +681,10 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, spin_lock_bh(&claim->backbone_gw->crc_lock); claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); spin_unlock_bh(&claim->backbone_gw->crc_lock); - batadv_backbone_gw_free_ref(claim->backbone_gw); + batadv_backbone_gw_put(claim->backbone_gw); } /* set (new) backbone gw */ - atomic_inc(&backbone_gw->refcount); + kref_get(&backbone_gw->refcount); claim->backbone_gw = backbone_gw; spin_lock_bh(&backbone_gw->crc_lock); @@ -634,11 +693,14 @@ static void batadv_bla_add_claim(struct batadv_priv *bat_priv, backbone_gw->lasttime = jiffies; claim_free_ref: - batadv_claim_free_ref(claim); + batadv_claim_put(claim); } -/* Delete a claim from the claim hash which has the - * given mac address and vid. +/** + * batadv_bla_del_claim - delete a claim from the claim hash + * @bat_priv: the bat priv with all the soft interface information + * @mac: mac address of the claim to be removed + * @vid: VLAN id for the claim to be removed */ static void batadv_bla_del_claim(struct batadv_priv *bat_priv, const u8 *mac, const unsigned short vid) @@ -656,17 +718,25 @@ static void batadv_bla_del_claim(struct batadv_priv *bat_priv, batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim, batadv_choose_claim, claim); - batadv_claim_free_ref(claim); /* reference from the hash is gone */ + batadv_claim_put(claim); /* reference from the hash is gone */ spin_lock_bh(&claim->backbone_gw->crc_lock); claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN); spin_unlock_bh(&claim->backbone_gw->crc_lock); /* don't need the reference from hash_find() anymore */ - batadv_claim_free_ref(claim); + batadv_claim_put(claim); } -/* check for ANNOUNCE frame, return 1 if handled */ +/** + * batadv_handle_announce - check for ANNOUNCE frame + * @bat_priv: the bat priv with all the soft interface information + * @an_addr: announcement mac address (ARP Sender HW address) + * @backbone_addr: originator address of the sender (Ethernet source MAC) + * @vid: the VLAN ID of the frame + * + * Return: 1 if handled + */ static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, u8 *backbone_addr, unsigned short vid) { @@ -712,11 +782,20 @@ static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr, } } - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); return 1; } -/* check for REQUEST frame, return 1 if handled */ +/** + * batadv_handle_request - check for REQUEST frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: backbone address to be requested (ARP sender HW MAC) + * @ethhdr: ethernet header of a packet + * @vid: the VLAN ID of the frame + * + * Return: 1 if handled + */ static int batadv_handle_request(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, u8 *backbone_addr, struct ethhdr *ethhdr, @@ -740,7 +819,16 @@ static int batadv_handle_request(struct batadv_priv *bat_priv, return 1; } -/* check for UNCLAIM frame, return 1 if handled */ +/** + * batadv_handle_unclaim - check for UNCLAIM frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: originator address of the backbone (Ethernet source) + * @claim_addr: Client to be unclaimed (ARP sender HW MAC) + * @vid: the VLAN ID of the frame + * + * Return: 1 if handled + */ static int batadv_handle_unclaim(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, u8 *backbone_addr, u8 *claim_addr, @@ -765,11 +853,20 @@ static int batadv_handle_unclaim(struct batadv_priv *bat_priv, claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig); batadv_bla_del_claim(bat_priv, claim_addr, vid); - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); return 1; } -/* check for CLAIM frame, return 1 if handled */ +/** + * batadv_handle_claim - check for CLAIM frame + * @bat_priv: the bat priv with all the soft interface information + * @primary_if: the primary hard interface of this batman soft interface + * @backbone_addr: originator address of the backbone (Ethernet Source) + * @claim_addr: client mac address to be claimed (ARP sender HW MAC) + * @vid: the VLAN ID of the frame + * + * Return: 1 if handled + */ static int batadv_handle_claim(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, u8 *backbone_addr, u8 *claim_addr, @@ -793,12 +890,12 @@ static int batadv_handle_claim(struct batadv_priv *bat_priv, /* TODO: we could call something like tt_local_del() here. */ - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); return 1; } /** - * batadv_check_claim_group + * batadv_check_claim_group - check for claim group membership * @bat_priv: the bat priv with all the soft interface information * @primary_if: the primary interface of this batman interface * @hw_src: the Hardware source in the ARP Header @@ -809,7 +906,7 @@ static int batadv_handle_claim(struct batadv_priv *bat_priv, * This function also applies the group ID of the sender * if it is in the same mesh. * - * returns: + * Return: * 2 - if it is a claim packet and on the same group * 1 - if is a claim packet from another group * 0 - if it is not a claim packet @@ -867,20 +964,18 @@ static int batadv_check_claim_group(struct batadv_priv *bat_priv, bla_dst_own->group = bla_dst->group; } - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return 2; } /** - * batadv_bla_process_claim + * batadv_bla_process_claim - Check if this is a claim frame, and process it * @bat_priv: the bat priv with all the soft interface information * @primary_if: the primary hard interface of this batman soft interface * @skb: the frame to be checked * - * Check if this is a claim frame, and process it accordingly. - * - * returns 1 if it was a claim frame, otherwise return 0 to + * Return: 1 if it was a claim frame, otherwise return 0 to * tell the callee that it can use the frame on its own. */ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, @@ -1011,7 +1106,13 @@ static int batadv_bla_process_claim(struct batadv_priv *bat_priv, return 1; } -/* Check when we last heard from other nodes, and remove them in case of +/** + * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or + * immediately + * @bat_priv: the bat priv with all the soft interface information + * @now: whether the whole hash shall be wiped now + * + * Check when we last heard from other nodes, and remove them in case of * a time out, or clean all backbone gws if now is set. */ static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) @@ -1052,14 +1153,14 @@ purge_now: batadv_bla_del_backbone_claims(backbone_gw); hlist_del_rcu(&backbone_gw->hash_entry); - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); } spin_unlock_bh(list_lock); } } /** - * batadv_bla_purge_claims + * batadv_bla_purge_claims - Remove claims after a timeout or immediately * @bat_priv: the bat priv with all the soft interface information * @primary_if: the selected primary interface, may be NULL if now is set * @now: whether the whole hash shall be wiped now @@ -1108,12 +1209,11 @@ purge_now: } /** - * batadv_bla_update_orig_address + * batadv_bla_update_orig_address - Update the backbone gateways when the own + * originator address changes * @bat_priv: the bat priv with all the soft interface information * @primary_if: the new selected primary_if * @oldif: the old primary interface, may be NULL - * - * Update the backbone gateways when the own orig address changes. */ void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, struct batadv_hard_iface *primary_if, @@ -1181,10 +1281,14 @@ void batadv_bla_status_update(struct net_device *net_dev) * so just call that one. */ batadv_bla_update_orig_address(bat_priv, primary_if, primary_if); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } -/* periodic work to do: +/** + * batadv_bla_periodic_work - performs periodic bla work + * @work: kernel work struct + * + * periodic work to do: * * purge structures when they are too old * * send announcements */ @@ -1251,7 +1355,7 @@ static void batadv_bla_periodic_work(struct work_struct *work) } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work, msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); @@ -1265,7 +1369,12 @@ out: static struct lock_class_key batadv_claim_hash_lock_class_key; static struct lock_class_key batadv_backbone_hash_lock_class_key; -/* initialize all bla structures */ +/** + * batadv_bla_init - initialize all bla structures + * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success, < 0 on error. + */ int batadv_bla_init(struct batadv_priv *bat_priv) { int i; @@ -1285,7 +1394,7 @@ int batadv_bla_init(struct batadv_priv *bat_priv) if (primary_if) { crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN); bat_priv->bla.claim_dest.group = htons(crc); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } else { bat_priv->bla.claim_dest.group = 0; /* will be set later */ } @@ -1320,7 +1429,7 @@ int batadv_bla_init(struct batadv_priv *bat_priv) } /** - * batadv_bla_check_bcast_duplist + * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup. * @bat_priv: the bat priv with all the soft interface information * @skb: contains the bcast_packet to be checked * @@ -1332,6 +1441,8 @@ int batadv_bla_init(struct batadv_priv *bat_priv) * with a good chance that it is the same packet. If it is furthermore * sent by another host, drop it. We allow equal packets from * the same host however as this might be intended. + * + * Return: 1 if a packet is in the duplicate list, 0 otherwise. */ int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv, struct sk_buff *skb) @@ -1390,14 +1501,13 @@ out: } /** - * batadv_bla_is_backbone_gw_orig + * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for + * the VLAN identified by vid. * @bat_priv: the bat priv with all the soft interface information * @orig: originator mac address * @vid: VLAN identifier * - * Check if the originator is a gateway for the VLAN identified by vid. - * - * Returns true if orig is a backbone for this vid, false otherwise. + * Return: true if orig is a backbone for this vid, false otherwise. */ bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, unsigned short vid) @@ -1431,14 +1541,13 @@ bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig, } /** - * batadv_bla_is_backbone_gw + * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN. * @skb: the frame to be checked * @orig_node: the orig_node of the frame * @hdr_size: maximum length of the frame * - * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1 - * if the orig_node is also a gateway on the soft interface, otherwise it - * returns 0. + * Return: 1 if the orig_node is also a gateway on the soft interface, otherwise + * it returns 0. */ int batadv_bla_is_backbone_gw(struct sk_buff *skb, struct batadv_orig_node *orig_node, int hdr_size) @@ -1461,11 +1570,16 @@ int batadv_bla_is_backbone_gw(struct sk_buff *skb, if (!backbone_gw) return 0; - batadv_backbone_gw_free_ref(backbone_gw); + batadv_backbone_gw_put(backbone_gw); return 1; } -/* free all bla structures (for softinterface free or module unload) */ +/** + * batadv_bla_init - free all bla structures + * @bat_priv: the bat priv with all the soft interface information + * + * for softinterface free or module unload + */ void batadv_bla_free(struct batadv_priv *bat_priv) { struct batadv_hard_iface *primary_if; @@ -1484,22 +1598,23 @@ void batadv_bla_free(struct batadv_priv *bat_priv) bat_priv->bla.backbone_hash = NULL; } if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** - * batadv_bla_rx + * batadv_bla_rx - check packets coming from the mesh. * @bat_priv: the bat priv with all the soft interface information * @skb: the frame to be checked * @vid: the VLAN ID of the frame * @is_bcast: the packet came in a broadcast packet type. * - * bla_rx avoidance checks if: + * batadv_bla_rx avoidance checks if: * * we have to race for a claim * * if the frame is allowed on the LAN * - * in these cases, the skb is further handled by this function and - * returns 1, otherwise it returns 0 and the caller shall further + * in these cases, the skb is further handled by this function + * + * Return: 1 if handled, otherwise it returns 0 and the caller shall further * process the skb. */ int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -1576,27 +1691,28 @@ handled: out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (claim) - batadv_claim_free_ref(claim); + batadv_claim_put(claim); return ret; } /** - * batadv_bla_tx + * batadv_bla_tx - check packets going into the mesh * @bat_priv: the bat priv with all the soft interface information * @skb: the frame to be checked * @vid: the VLAN ID of the frame * - * bla_tx checks if: + * batadv_bla_tx checks if: * * a claim was received which has to be processed * * the frame is allowed on the mesh * - * in these cases, the skb is further handled by this function and - * returns 1, otherwise it returns 0 and the caller shall further - * process the skb. + * in these cases, the skb is further handled by this function. * * This call might reallocate skb data. + * + * Return: 1 if handled, otherwise it returns 0 and the caller shall further + * process the skb. */ int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb, unsigned short vid) @@ -1664,12 +1780,19 @@ handled: ret = 1; out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (claim) - batadv_claim_free_ref(claim); + batadv_claim_put(claim); return ret; } +/** + * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file + * @seq: seq file to print on + * @offset: not used + * + * Return: always 0 + */ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; @@ -1715,10 +1838,18 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } +/** + * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq + * file + * @seq: seq file to print on + * @offset: not used + * + * Return: always 0 + */ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; @@ -1772,6 +1903,6 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } diff --git a/net/batman-adv/bridge_loop_avoidance.h b/net/batman-adv/bridge_loop_avoidance.h index 7ea199b8b5ab..579f0fa6fe6a 100644 --- a/net/batman-adv/bridge_loop_avoidance.h +++ b/net/batman-adv/bridge_loop_avoidance.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich * diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c index 037ad0a5f485..48253cf8341b 100644 --- a/net/batman-adv/debugfs.c +++ b/net/batman-adv/debugfs.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2010-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -281,6 +281,8 @@ static int batadv_originators_open(struct inode *inode, struct file *file) * originator table of an hard interface * @inode: inode pointer to debugfs file * @file: pointer to the seq_file + * + * Return: 0 on success or negative error number in case of failure */ static int batadv_originators_hardif_open(struct inode *inode, struct file *file) @@ -329,6 +331,8 @@ static int batadv_bla_backbone_table_open(struct inode *inode, * batadv_dat_cache_open - Prepare file handler for reads from dat_chache * @inode: inode which was opened * @file: file handle to be initialized + * + * Return: 0 on success or negative error number in case of failure */ static int batadv_dat_cache_open(struct inode *inode, struct file *file) { @@ -483,6 +487,8 @@ void batadv_debugfs_destroy(void) * batadv_debugfs_add_hardif - creates the base directory for a hard interface * in debugfs. * @hard_iface: hard interface which should be added. + * + * Return: 0 on success or negative error number in case of failure */ int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface) { diff --git a/net/batman-adv/debugfs.h b/net/batman-adv/debugfs.h index 80ab8d6f0ab3..1ab4e2e63afc 100644 --- a/net/batman-adv/debugfs.h +++ b/net/batman-adv/debugfs.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2010-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index a49c705fb86b..3e6b2624f980 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: * * Antonio Quartulli * @@ -30,6 +30,7 @@ #include <linux/in.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/rculist.h> #include <linux/rcupdate.h> @@ -62,21 +63,34 @@ static void batadv_dat_start_timer(struct batadv_priv *bat_priv) } /** - * batadv_dat_entry_free_ref - decrement the dat_entry refcounter and possibly - * free it - * @dat_entry: the entry to free + * batadv_dat_entry_release - release dat_entry from lists and queue for free + * after rcu grace period + * @ref: kref pointer of the dat_entry */ -static void batadv_dat_entry_free_ref(struct batadv_dat_entry *dat_entry) +static void batadv_dat_entry_release(struct kref *ref) { - if (atomic_dec_and_test(&dat_entry->refcount)) - kfree_rcu(dat_entry, rcu); + struct batadv_dat_entry *dat_entry; + + dat_entry = container_of(ref, struct batadv_dat_entry, refcount); + + kfree_rcu(dat_entry, rcu); +} + +/** + * batadv_dat_entry_put - decrement the dat_entry refcounter and possibly + * release it + * @dat_entry: dat_entry to be free'd + */ +static void batadv_dat_entry_put(struct batadv_dat_entry *dat_entry) +{ + kref_put(&dat_entry->refcount, batadv_dat_entry_release); } /** * batadv_dat_to_purge - check whether a dat_entry has to be purged or not * @dat_entry: the entry to check * - * Returns true if the entry has to be purged now, false otherwise. + * Return: true if the entry has to be purged now, false otherwise. */ static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry) { @@ -121,7 +135,7 @@ static void __batadv_dat_purge(struct batadv_priv *bat_priv, continue; hlist_del_rcu(&dat_entry->hash_entry); - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); } spin_unlock_bh(list_lock); } @@ -151,7 +165,7 @@ static void batadv_dat_purge(struct work_struct *work) * @node: node in the local table * @data2: second object to compare the node to * - * Returns 1 if the two entries are the same, 0 otherwise. + * Return: 1 if the two entries are the same, 0 otherwise. */ static int batadv_compare_dat(const struct hlist_node *node, const void *data2) { @@ -166,7 +180,7 @@ static int batadv_compare_dat(const struct hlist_node *node, const void *data2) * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * - * Returns the value of the hw_src field in the ARP packet. + * Return: the value of the hw_src field in the ARP packet. */ static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) { @@ -183,7 +197,7 @@ static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size) * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * - * Returns the value of the ip_src field in the ARP packet. + * Return: the value of the ip_src field in the ARP packet. */ static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) { @@ -195,7 +209,7 @@ static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size) * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * - * Returns the value of the hw_dst field in the ARP packet. + * Return: the value of the hw_dst field in the ARP packet. */ static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) { @@ -207,7 +221,7 @@ static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size) * @skb: ARP packet * @hdr_size: size of the possible header before the ARP packet * - * Returns the value of the ip_dst field in the ARP packet. + * Return: the value of the ip_dst field in the ARP packet. */ static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) { @@ -219,7 +233,7 @@ static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size) * @data: data to hash * @size: size of the hash table * - * Returns the selected index in the hash table for the given data. + * Return: the selected index in the hash table for the given data. */ static u32 batadv_hash_dat(const void *data, u32 size) { @@ -256,7 +270,7 @@ static u32 batadv_hash_dat(const void *data, u32 size) * @ip: search key * @vid: VLAN identifier * - * Returns the dat_entry if found, NULL otherwise. + * Return: the dat_entry if found, NULL otherwise. */ static struct batadv_dat_entry * batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, @@ -281,7 +295,7 @@ batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, if (dat_entry->ip != ip) continue; - if (!atomic_inc_not_zero(&dat_entry->refcount)) + if (!kref_get_unless_zero(&dat_entry->refcount)) continue; dat_entry_tmp = dat_entry; @@ -326,7 +340,8 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, dat_entry->vid = vid; ether_addr_copy(dat_entry->mac_addr, mac_addr); dat_entry->last_update = jiffies; - atomic_set(&dat_entry->refcount, 2); + kref_init(&dat_entry->refcount); + kref_get(&dat_entry->refcount); hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat, batadv_hash_dat, dat_entry, @@ -334,7 +349,7 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); goto out; } @@ -343,7 +358,7 @@ static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip, out: if (dat_entry) - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); } #ifdef CONFIG_BATMAN_ADV_DEBUG @@ -440,7 +455,7 @@ static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb, * @candidate: orig_node under evaluation * @max_orig_node: last selected candidate * - * Returns true if the node has been elected as next candidate or false + * Return: true if the node has been elected as next candidate or false * otherwise. */ static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res, @@ -527,12 +542,12 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, max_orig_node)) continue; - if (!atomic_inc_not_zero(&orig_node->refcount)) + if (!kref_get_unless_zero(&orig_node->refcount)) continue; max = tmp_max; if (max_orig_node) - batadv_orig_node_free_ref(max_orig_node); + batadv_orig_node_put(max_orig_node); max_orig_node = orig_node; } rcu_read_unlock(); @@ -553,15 +568,17 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, * be sent to * @bat_priv: the bat priv with all the soft interface information * @ip_dst: ipv4 to look up in the DHT + * @vid: VLAN identifier * * An originator O is selected if and only if its DHT_ID value is one of three * closest values (from the LEFT, with wrap around if needed) then the hash * value of the key. ip_dst is the key. * - * Returns the candidate array of size BATADV_DAT_CANDIDATE_NUM. + * Return: the candidate array of size BATADV_DAT_CANDIDATE_NUM. */ static struct batadv_dat_candidate * -batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) +batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst, + unsigned short vid) { int select; batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; @@ -577,7 +594,7 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) return NULL; dat.ip = ip_dst; - dat.vid = 0; + dat.vid = vid; ip_key = (batadv_dat_addr_t)batadv_hash_dat(&dat, BATADV_DAT_ADDR_MAX); @@ -597,17 +614,18 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send * @ip: the DHT key + * @vid: VLAN identifier * @packet_subtype: unicast4addr packet subtype to use * * This function copies the skb with pskb_copy() and is sent as unicast packet * to each of the selected candidates. * - * Returns true if the packet is sent to at least one candidate, false + * Return: true if the packet is sent to at least one candidate, false * otherwise. */ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, struct sk_buff *skb, __be32 ip, - int packet_subtype) + unsigned short vid, int packet_subtype) { int i; bool ret = false; @@ -616,7 +634,7 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, struct sk_buff *tmp_skb; struct batadv_dat_candidate *cand; - cand = batadv_dat_select_candidates(bat_priv, ip); + cand = batadv_dat_select_candidates(bat_priv, ip, vid); if (!cand) goto out; @@ -639,9 +657,7 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, goto free_neigh; } - send_status = batadv_send_skb_packet(tmp_skb, - neigh_node->if_incoming, - neigh_node->addr); + send_status = batadv_send_unicast_skb(tmp_skb, neigh_node); if (send_status == NET_XMIT_SUCCESS) { /* count the sent packet */ switch (packet_subtype) { @@ -659,9 +675,9 @@ static bool batadv_dat_send_data(struct batadv_priv *bat_priv, ret = true; } free_neigh: - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); free_orig: - batadv_orig_node_free_ref(cand[i].orig_node); + batadv_orig_node_put(cand[i].orig_node); } out: @@ -741,6 +757,8 @@ static void batadv_dat_hash_free(struct batadv_priv *bat_priv) /** * batadv_dat_init - initialise the DAT internals * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 in case of success, a negative error code otherwise */ int batadv_dat_init(struct batadv_priv *bat_priv) { @@ -779,6 +797,8 @@ void batadv_dat_free(struct batadv_priv *bat_priv) * batadv_dat_cache_seq_print_text - print the local DAT hash table * @seq: seq file to print on * @offset: not used + * + * Return: always 0 */ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) { @@ -821,7 +841,7 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } @@ -831,7 +851,7 @@ out: * @skb: packet to analyse * @hdr_size: size of the possible header before the ARP packet in the skb * - * Returns the ARP type if the skb contains a valid ARP packet, 0 otherwise. + * Return: the ARP type if the skb contains a valid ARP packet, 0 otherwise. */ static u16 batadv_arp_get_type(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) @@ -904,8 +924,9 @@ out: * @skb: the buffer containing the packet to extract the VID from * @hdr_size: the size of the batman-adv header encapsulating the packet * - * If the packet embedded in the skb is vlan tagged this function returns the - * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. + * Return: If the packet embedded in the skb is vlan tagged this function + * returns the VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS + * is returned. */ static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) { @@ -930,7 +951,7 @@ static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size) * @bat_priv: the bat priv with all the soft interface information * @skb: packet to check * - * Returns true if the message has been sent to the dht candidates, false + * Return: true if the message has been sent to the dht candidates, false * otherwise. In case of a positive return value the message has to be enqueued * to permit the fallback. */ @@ -1004,12 +1025,12 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, ret = true; } else { /* Send the request to the DHT */ - ret = batadv_dat_send_data(bat_priv, skb, ip_dst, + ret = batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_GET); } out: if (dat_entry) - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); return ret; } @@ -1020,7 +1041,7 @@ out: * @skb: packet to check * @hdr_size: size of the encapsulation header * - * Returns true if the request has been answered, false otherwise. + * Return: true if the request has been answered, false otherwise. */ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) @@ -1089,7 +1110,7 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, } out: if (dat_entry) - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); if (ret) kfree_skb(skb); return ret; @@ -1132,8 +1153,8 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, /* Send the ARP reply to the candidates for both the IP addresses that * the node obtained from the ARP reply */ - batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT); - batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, ip_src, vid, BATADV_P_DAT_DHT_PUT); + batadv_dat_send_data(bat_priv, skb, ip_dst, vid, BATADV_P_DAT_DHT_PUT); } /** @@ -1143,7 +1164,7 @@ void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv, * @skb: packet to check * @hdr_size: size of the encapsulation header * - * Returns true if the packet was snooped and consumed by DAT. False if the + * Return: true if the packet was snooped and consumed by DAT. False if the * packet has to be delivered to the interface */ bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv, @@ -1200,7 +1221,7 @@ out: * @bat_priv: the bat priv with all the soft interface information * @forw_packet: the broadcast packet * - * Returns true if the node can drop the packet, false otherwise. + * Return: true if the node can drop the packet, false otherwise. */ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, struct batadv_forw_packet *forw_packet) @@ -1242,6 +1263,6 @@ bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv, out: if (dat_entry) - batadv_dat_entry_free_ref(dat_entry); + batadv_dat_entry_put(dat_entry); return ret; } diff --git a/net/batman-adv/distributed-arp-table.h b/net/batman-adv/distributed-arp-table.h index 26d4a525a798..813ecea96cf9 100644 --- a/net/batman-adv/distributed-arp-table.h +++ b/net/batman-adv/distributed-arp-table.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors: * * Antonio Quartulli * diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c index 20d9282f895b..e6956d0746a2 100644 --- a/net/batman-adv/fragmentation.c +++ b/net/batman-adv/fragmentation.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2013-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: * * Martin Hundebøll <martin@hundeboll.net> * @@ -85,7 +85,7 @@ void batadv_frag_purge_orig(struct batadv_orig_node *orig_node, /** * batadv_frag_size_limit - maximum possible size of packet to be fragmented * - * Returns the maximum size of payload that can be fragmented. + * Return: the maximum size of payload that can be fragmented. */ static int batadv_frag_size_limit(void) { @@ -107,7 +107,7 @@ static int batadv_frag_size_limit(void) * * Caller must hold chain->lock. * - * Returns true if chain is empty and caller can just insert the new fragment + * Return: true if chain is empty and caller can just insert the new fragment * without searching for the right position. */ static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain, @@ -136,7 +136,7 @@ static bool batadv_frag_init_chain(struct batadv_frag_table_entry *chain, * Insert a new fragment into the reverse ordered chain in the right table * entry. The hash table entry is cleared if "old" fragments exist in it. * - * Returns true if skb is buffered, false on error. If the chain has all the + * Return: true if skb is buffered, false on error. If the chain has all the * fragments needed to merge the packet, the chain is moved to the passed head * to avoid locking the chain in the table. */ @@ -242,12 +242,11 @@ err: /** * batadv_frag_merge_packets - merge a chain of fragments * @chain: head of chain with fragments - * @skb: packet with total size of skb after merging * * Expand the first skb in the chain and copy the content of the remaining * skb's into the expanded one. After doing so, clear the chain. * - * Returns the merged skb or NULL on error. + * Return: the merged skb or NULL on error. */ static struct sk_buff * batadv_frag_merge_packets(struct hlist_head *chain) @@ -307,6 +306,9 @@ free: * There are three possible outcomes: 1) Packet is merged: Return true and * set *skb to merged packet; 2) Packet is buffered: Return true and set *skb * to NULL; 3) Error: Return false and leave skb as is. + * + * Return: true when packet is merged or buffered, false when skb is not not + * used. */ bool batadv_frag_skb_buffer(struct sk_buff **skb, struct batadv_orig_node *orig_node_src) @@ -344,7 +346,7 @@ out_err: * will exceed the MTU towards the next-hop. If so, the fragment is forwarded * without merging it. * - * Returns true if the fragment is consumed/forwarded, false otherwise. + * Return: true if the fragment is consumed/forwarded, false otherwise. */ bool batadv_frag_skb_fwd(struct sk_buff *skb, struct batadv_hard_iface *recv_if, @@ -376,16 +378,15 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb, skb->len + ETH_HLEN); packet->ttl--; - batadv_send_skb_packet(skb, neigh_node->if_incoming, - neigh_node->addr); + batadv_send_unicast_skb(skb, neigh_node); ret = true; } out: if (orig_node_dst) - batadv_orig_node_free_ref(orig_node_dst); + batadv_orig_node_put(orig_node_dst); if (neigh_node) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); return ret; } @@ -399,7 +400,7 @@ out: * passed mtu and the old one with the rest. The new skb contains data from the * tail of the old skb. * - * Returns the new fragment, NULL on error. + * Return: the new fragment, NULL on error. */ static struct sk_buff *batadv_frag_create(struct sk_buff *skb, struct batadv_frag_packet *frag_head, @@ -433,7 +434,7 @@ err: * @orig_node: final destination of the created fragments * @neigh_node: next-hop of the created fragments * - * Returns true on success, false otherwise. + * Return: true on success, false otherwise. */ bool batadv_frag_send_packet(struct sk_buff *skb, struct batadv_orig_node *orig_node, @@ -484,8 +485,7 @@ bool batadv_frag_send_packet(struct sk_buff *skb, batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX); batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES, skb_fragment->len + ETH_HLEN); - batadv_send_skb_packet(skb_fragment, neigh_node->if_incoming, - neigh_node->addr); + batadv_send_unicast_skb(skb_fragment, neigh_node); frag_header.no++; /* The initial check in this function should cover this case */ @@ -504,13 +504,13 @@ bool batadv_frag_send_packet(struct sk_buff *skb, batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX); batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES, skb->len + ETH_HLEN); - batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + batadv_send_unicast_skb(skb, neigh_node); ret = true; out_err: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return ret; } diff --git a/net/batman-adv/fragmentation.h b/net/batman-adv/fragmentation.h index 8b9877e70b95..9ff77c7ef7c7 100644 --- a/net/batman-adv/fragmentation.h +++ b/net/batman-adv/fragmentation.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2013-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors: * * Martin Hundebøll <martin@hundeboll.net> * @@ -42,7 +42,7 @@ bool batadv_frag_send_packet(struct sk_buff *skb, * batadv_frag_check_entry - check if a list of fragments has timed out * @frags_entry: table entry to check * - * Returns true if the frags entry has timed out, false otherwise. + * Return: true if the frags entry has timed out, false otherwise. */ static inline bool batadv_frag_check_entry(struct batadv_frag_table_entry *frags_entry) diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c index e6c8382c79ba..c59aff5ccac8 100644 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -28,6 +28,7 @@ #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/netdevice.h> #include <linux/rculist.h> @@ -59,12 +60,28 @@ */ #define BATADV_DHCP_CHADDR_OFFSET 28 -static void batadv_gw_node_free_ref(struct batadv_gw_node *gw_node) +/** + * batadv_gw_node_release - release gw_node from lists and queue for free after + * rcu grace period + * @ref: kref pointer of the gw_node + */ +static void batadv_gw_node_release(struct kref *ref) { - if (atomic_dec_and_test(&gw_node->refcount)) { - batadv_orig_node_free_ref(gw_node->orig_node); - kfree_rcu(gw_node, rcu); - } + struct batadv_gw_node *gw_node; + + gw_node = container_of(ref, struct batadv_gw_node, refcount); + + batadv_orig_node_put(gw_node->orig_node); + kfree_rcu(gw_node, rcu); +} + +/** + * batadv_gw_node_put - decrement the gw_node refcounter and possibly release it + * @gw_node: gateway node to free + */ +static void batadv_gw_node_put(struct batadv_gw_node *gw_node) +{ + kref_put(&gw_node->refcount, batadv_gw_node_release); } static struct batadv_gw_node * @@ -77,7 +94,7 @@ batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv) if (!gw_node) goto out; - if (!atomic_inc_not_zero(&gw_node->refcount)) + if (!kref_get_unless_zero(&gw_node->refcount)) gw_node = NULL; out: @@ -100,14 +117,14 @@ batadv_gw_get_selected_orig(struct batadv_priv *bat_priv) if (!orig_node) goto unlock; - if (!atomic_inc_not_zero(&orig_node->refcount)) + if (!kref_get_unless_zero(&orig_node->refcount)) orig_node = NULL; unlock: rcu_read_unlock(); out: if (gw_node) - batadv_gw_node_free_ref(gw_node); + batadv_gw_node_put(gw_node); return orig_node; } @@ -118,14 +135,14 @@ static void batadv_gw_select(struct batadv_priv *bat_priv, spin_lock_bh(&bat_priv->gw.list_lock); - if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount)) + if (new_gw_node && !kref_get_unless_zero(&new_gw_node->refcount)) new_gw_node = NULL; curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1); rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node); if (curr_gw_node) - batadv_gw_node_free_ref(curr_gw_node); + batadv_gw_node_put(curr_gw_node); spin_unlock_bh(&bat_priv->gw.list_lock); } @@ -170,7 +187,7 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) if (!router_ifinfo) goto next; - if (!atomic_inc_not_zero(&gw_node->refcount)) + if (!kref_get_unless_zero(&gw_node->refcount)) goto next; tq_avg = router_ifinfo->bat_iv.tq_avg; @@ -186,9 +203,9 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) ((tmp_gw_factor == max_gw_factor) && (tq_avg > max_tq))) { if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); curr_gw = gw_node; - atomic_inc(&curr_gw->refcount); + kref_get(&curr_gw->refcount); } break; @@ -201,9 +218,9 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) */ if (tq_avg > max_tq) { if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); curr_gw = gw_node; - atomic_inc(&curr_gw->refcount); + kref_get(&curr_gw->refcount); } break; } @@ -214,12 +231,12 @@ batadv_gw_get_best_gw_node(struct batadv_priv *bat_priv) if (tmp_gw_factor > max_gw_factor) max_gw_factor = tmp_gw_factor; - batadv_gw_node_free_ref(gw_node); + batadv_gw_node_put(gw_node); next: - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); if (router_ifinfo) - batadv_neigh_ifinfo_free_ref(router_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); } rcu_read_unlock(); @@ -255,7 +272,7 @@ void batadv_gw_check_client_stop(struct batadv_priv *bat_priv) */ batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL); - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); } void batadv_gw_election(struct batadv_priv *bat_priv) @@ -330,13 +347,13 @@ void batadv_gw_election(struct batadv_priv *bat_priv) out: if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); if (next_gw) - batadv_gw_node_free_ref(next_gw); + batadv_gw_node_put(next_gw); if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); if (router_ifinfo) - batadv_neigh_ifinfo_free_ref(router_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); } void batadv_gw_check_election(struct batadv_priv *bat_priv, @@ -397,15 +414,15 @@ reselect: batadv_gw_reselect(bat_priv); out: if (curr_gw_orig) - batadv_orig_node_free_ref(curr_gw_orig); + batadv_orig_node_put(curr_gw_orig); if (router_gw) - batadv_neigh_node_free_ref(router_gw); + batadv_neigh_node_put(router_gw); if (router_orig) - batadv_neigh_node_free_ref(router_orig); + batadv_neigh_node_put(router_orig); if (router_gw_tq) - batadv_neigh_ifinfo_free_ref(router_gw_tq); + batadv_neigh_ifinfo_put(router_gw_tq); if (router_orig_tq) - batadv_neigh_ifinfo_free_ref(router_orig_tq); + batadv_neigh_ifinfo_put(router_orig_tq); } /** @@ -423,12 +440,12 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv, if (gateway->bandwidth_down == 0) return; - if (!atomic_inc_not_zero(&orig_node->refcount)) + if (!kref_get_unless_zero(&orig_node->refcount)) return; gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC); if (!gw_node) { - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return; } @@ -436,7 +453,7 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv, gw_node->orig_node = orig_node; gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); - atomic_set(&gw_node->refcount, 1); + kref_init(&gw_node->refcount); spin_lock_bh(&bat_priv->gw.list_lock); hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); @@ -456,7 +473,7 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @orig_node: originator announcing gateway capabilities * - * Returns gateway node if found or NULL otherwise. + * Return: gateway node if found or NULL otherwise. */ static struct batadv_gw_node * batadv_gw_node_get(struct batadv_priv *bat_priv, @@ -469,7 +486,7 @@ batadv_gw_node_get(struct batadv_priv *bat_priv, if (gw_node_tmp->orig_node != orig_node) continue; - if (!atomic_inc_not_zero(&gw_node_tmp->refcount)) + if (!kref_get_unless_zero(&gw_node_tmp->refcount)) continue; gw_node = gw_node_tmp; @@ -527,22 +544,23 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv, * gets dereferenced. */ spin_lock_bh(&bat_priv->gw.list_lock); - hlist_del_init_rcu(&gw_node->list); + if (!hlist_unhashed(&gw_node->list)) { + hlist_del_init_rcu(&gw_node->list); + batadv_gw_node_put(gw_node); + } spin_unlock_bh(&bat_priv->gw.list_lock); - batadv_gw_node_free_ref(gw_node); - curr_gw = batadv_gw_get_selected_gw_node(bat_priv); if (gw_node == curr_gw) batadv_gw_reselect(bat_priv); if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); } out: if (gw_node) - batadv_gw_node_free_ref(gw_node); + batadv_gw_node_put(gw_node); } void batadv_gw_node_delete(struct batadv_priv *bat_priv, @@ -565,7 +583,7 @@ void batadv_gw_node_free(struct batadv_priv *bat_priv) hlist_for_each_entry_safe(gw_node, node_tmp, &bat_priv->gw.list, list) { hlist_del_init_rcu(&gw_node->list); - batadv_gw_node_free_ref(gw_node); + batadv_gw_node_put(gw_node); } spin_unlock_bh(&bat_priv->gw.list_lock); } @@ -602,12 +620,12 @@ static int batadv_write_buffer_text(struct batadv_priv *bat_priv, ret = seq_has_overflowed(seq) ? -1 : 0; if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); out: if (router_ifinfo) - batadv_neigh_ifinfo_free_ref(router_ifinfo); + batadv_neigh_ifinfo_put(router_ifinfo); if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); return ret; } @@ -644,7 +662,7 @@ int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } @@ -655,13 +673,13 @@ out: * @chaddr: buffer where the client address will be stored. Valid * only if the function returns BATADV_DHCP_TO_CLIENT * - * Returns: + * This function may re-allocate the data buffer of the skb passed as argument. + * + * Return: * - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error * while parsing it * - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server * - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client - * - * This function may re-allocate the data buffer of the skb passed as argument. */ enum batadv_dhcp_recipient batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, @@ -776,11 +794,11 @@ batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len, * server. Due to topology changes it may be the case that the GW server * previously selected is not the best one anymore. * - * Returns true if the packet destination is unicast and it is not the best gw, - * false otherwise. - * * This call might reallocate skb data. * Must be invoked only when the DHCP packet is going TO a DHCP SERVER. + * + * Return: true if the packet destination is unicast and it is not the best gw, + * false otherwise. */ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb) @@ -838,7 +856,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, goto out; curr_tq_avg = curr_ifinfo->bat_iv.tq_avg; - batadv_neigh_ifinfo_free_ref(curr_ifinfo); + batadv_neigh_ifinfo_put(curr_ifinfo); break; case BATADV_GW_MODE_OFF: @@ -856,18 +874,18 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD) out_of_range = true; - batadv_neigh_ifinfo_free_ref(old_ifinfo); + batadv_neigh_ifinfo_put(old_ifinfo); out: if (orig_dst_node) - batadv_orig_node_free_ref(orig_dst_node); + batadv_orig_node_put(orig_dst_node); if (curr_gw) - batadv_gw_node_free_ref(curr_gw); + batadv_gw_node_put(curr_gw); if (gw_node) - batadv_gw_node_free_ref(gw_node); + batadv_gw_node_put(gw_node); if (neigh_old) - batadv_neigh_node_free_ref(neigh_old); + batadv_neigh_node_put(neigh_old); if (neigh_curr) - batadv_neigh_node_free_ref(neigh_curr); + batadv_neigh_node_put(neigh_curr); return out_of_range; } diff --git a/net/batman-adv/gateway_client.h b/net/batman-adv/gateway_client.h index fa9527785ed3..582dd8c413c8 100644 --- a/net/batman-adv/gateway_client.h +++ b/net/batman-adv/gateway_client.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * diff --git a/net/batman-adv/gateway_common.c b/net/batman-adv/gateway_common.c index b51bface8bdd..4423047889e1 100644 --- a/net/batman-adv/gateway_common.c +++ b/net/batman-adv/gateway_common.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -38,10 +38,10 @@ * @description: text shown when throughput string cannot be parsed * @throughput: pointer holding the returned throughput information * - * Returns false on parse error and true otherwise. + * Return: false on parse error and true otherwise. */ -static bool batadv_parse_throughput(struct net_device *net_dev, char *buff, - const char *description, u32 *throughput) +bool batadv_parse_throughput(struct net_device *net_dev, char *buff, + const char *description, u32 *throughput) { enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT; u64 lthroughput; diff --git a/net/batman-adv/gateway_common.h b/net/batman-adv/gateway_common.h index ab893e318229..8a5e1ddf1175 100644 --- a/net/batman-adv/gateway_common.h +++ b/net/batman-adv/gateway_common.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -49,5 +49,7 @@ ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff, void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv); void batadv_gw_init(struct batadv_priv *bat_priv); void batadv_gw_free(struct batadv_priv *bat_priv); +bool batadv_parse_throughput(struct net_device *net_dev, char *buff, + const char *description, u32 *throughput); #endif /* _NET_BATMAN_ADV_GATEWAY_COMMON_H_ */ diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 01acccc4d218..0a7deaf2670a 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -18,6 +18,7 @@ #include "hard-interface.h" #include "main.h" +#include <linux/atomic.h> #include <linux/bug.h> #include <linux/byteorder/generic.h> #include <linux/errno.h> @@ -26,6 +27,7 @@ #include <linux/if_ether.h> #include <linux/if.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/netdevice.h> #include <linux/printk.h> @@ -47,13 +49,19 @@ #include "sysfs.h" #include "translation-table.h" -void batadv_hardif_free_rcu(struct rcu_head *rcu) +/** + * batadv_hardif_release - release hard interface from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the hard interface + */ +void batadv_hardif_release(struct kref *ref) { struct batadv_hard_iface *hard_iface; - hard_iface = container_of(rcu, struct batadv_hard_iface, rcu); + hard_iface = container_of(ref, struct batadv_hard_iface, refcount); dev_put(hard_iface->net_dev); - kfree(hard_iface); + + kfree_rcu(hard_iface, rcu); } struct batadv_hard_iface * @@ -64,7 +72,7 @@ batadv_hardif_get_by_netdev(const struct net_device *net_dev) rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { if (hard_iface->net_dev == net_dev && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -76,6 +84,28 @@ out: } /** + * batadv_mutual_parents - check if two devices are each others parent + * @dev1: 1st net_device + * @dev2: 2nd net_device + * + * veth devices come in pairs and each is the parent of the other! + * + * Return: true if the devices are each others parent, otherwise false + */ +static bool batadv_mutual_parents(const struct net_device *dev1, + const struct net_device *dev2) +{ + int dev1_parent_iflink = dev_get_iflink(dev1); + int dev2_parent_iflink = dev_get_iflink(dev2); + + if (!dev1_parent_iflink || !dev2_parent_iflink) + return false; + + return (dev1_parent_iflink == dev2->ifindex) && + (dev2_parent_iflink == dev1->ifindex); +} + +/** * batadv_is_on_batman_iface - check if a device is a batman iface descendant * @net_dev: the device to check * @@ -85,7 +115,7 @@ out: * This function recursively checks all the fathers of the device passed as * argument looking for a batman-adv soft interface. * - * Returns true if the device is descendant of a batman-adv mesh interface (or + * Return: true if the device is descendant of a batman-adv mesh interface (or * if it is a batman-adv interface itself), false otherwise */ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) @@ -108,6 +138,9 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) if (WARN(!parent_dev, "Cannot find parent device")) return false; + if (batadv_mutual_parents(net_dev, parent_dev)) + return false; + ret = batadv_is_on_batman_iface(parent_dev); return ret; @@ -136,7 +169,7 @@ static int batadv_is_valid_iface(const struct net_device *net_dev) * interface * @net_device: the device to check * - * Returns true if the net device is a 802.11 wireless device, false otherwise. + * Return: true if the net device is a 802.11 wireless device, false otherwise. */ bool batadv_is_wifi_netdev(struct net_device *net_device) { @@ -169,7 +202,7 @@ batadv_hardif_get_active(const struct net_device *soft_iface) continue; if (hard_iface->if_status == BATADV_IF_ACTIVE && - atomic_inc_not_zero(&hard_iface->refcount)) + kref_get_unless_zero(&hard_iface->refcount)) goto out; } @@ -193,7 +226,7 @@ static void batadv_primary_if_update_addr(struct batadv_priv *bat_priv, batadv_bla_update_orig_address(bat_priv, primary_if, oldif); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void batadv_primary_if_select(struct batadv_priv *bat_priv, @@ -203,7 +236,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, ASSERT_RTNL(); - if (new_hard_iface && !atomic_inc_not_zero(&new_hard_iface->refcount)) + if (new_hard_iface && !kref_get_unless_zero(&new_hard_iface->refcount)) new_hard_iface = NULL; curr_hard_iface = rcu_dereference_protected(bat_priv->primary_if, 1); @@ -217,7 +250,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv, out: if (curr_hard_iface) - batadv_hardif_free_ref(curr_hard_iface); + batadv_hardif_put(curr_hard_iface); } static bool @@ -374,9 +407,12 @@ batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface) batadv_update_min_mtu(hard_iface->soft_iface); + if (bat_priv->bat_algo_ops->bat_iface_activate) + bat_priv->bat_algo_ops->bat_iface_activate(hard_iface); + out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void @@ -401,7 +437,8 @@ batadv_hardif_deactivate_interface(struct batadv_hard_iface *hard_iface) * * Invoke ndo_del_slave on master passing slave as argument. In this way slave * is free'd and master can correctly change its internal state. - * Return 0 on success, a negative value representing the error otherwise + * + * Return: 0 on success, a negative value representing the error otherwise */ static int batadv_master_del_slave(struct batadv_hard_iface *slave, struct net_device *master) @@ -430,7 +467,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface, if (hard_iface->if_status != BATADV_IF_NOT_IN_USE) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) + if (!kref_get_unless_zero(&hard_iface->refcount)) goto out; soft_iface = dev_get_by_name(&init_net, iface_name); @@ -528,7 +565,7 @@ err_dev: hard_iface->soft_iface = NULL; dev_put(soft_iface); err: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } @@ -538,8 +575,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_hard_iface *primary_if = NULL; - if (hard_iface->if_status == BATADV_IF_ACTIVE) - batadv_hardif_deactivate_interface(hard_iface); + batadv_hardif_deactivate_interface(hard_iface); if (hard_iface->if_status != BATADV_IF_INACTIVE) goto out; @@ -559,7 +595,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, batadv_primary_if_select(bat_priv, new_if); if (new_if) - batadv_hardif_free_ref(new_if); + batadv_hardif_put(new_if); } bat_priv->bat_algo_ops->bat_iface_disable(hard_iface); @@ -582,11 +618,11 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, } hard_iface->soft_iface = NULL; - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } /** @@ -605,7 +641,7 @@ static void batadv_hardif_remove_interface_finish(struct work_struct *work) batadv_debugfs_del_hardif(hard_iface); batadv_sysfs_del_hardif(&hard_iface->hardif_obj); - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); } static struct batadv_hard_iface * @@ -651,7 +687,8 @@ batadv_hardif_add_interface(struct net_device *net_dev) hard_iface->num_bcasts = BATADV_NUM_BCASTS_WIRELESS; /* extra reference for return */ - atomic_set(&hard_iface->refcount, 2); + kref_init(&hard_iface->refcount); + kref_get(&hard_iface->refcount); batadv_check_known_mac_addr(hard_iface->net_dev); list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list); @@ -759,10 +796,10 @@ static int batadv_hard_if_event(struct notifier_block *this, } hardif_put: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return NOTIFY_DONE; } diff --git a/net/batman-adv/hard-interface.h b/net/batman-adv/hard-interface.h index 7b12ea8ea29d..d74f1983f33e 100644 --- a/net/batman-adv/hard-interface.h +++ b/net/batman-adv/hard-interface.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -20,8 +20,8 @@ #include "main.h" -#include <linux/atomic.h> #include <linux/compiler.h> +#include <linux/kref.h> #include <linux/notifier.h> #include <linux/rcupdate.h> #include <linux/stddef.h> @@ -61,18 +61,16 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface, void batadv_hardif_remove_interfaces(void); int batadv_hardif_min_mtu(struct net_device *soft_iface); void batadv_update_min_mtu(struct net_device *soft_iface); -void batadv_hardif_free_rcu(struct rcu_head *rcu); +void batadv_hardif_release(struct kref *ref); /** - * batadv_hardif_free_ref - decrement the hard interface refcounter and - * possibly free it + * batadv_hardif_put - decrement the hard interface refcounter and possibly + * release it * @hard_iface: the hard interface to free */ -static inline void -batadv_hardif_free_ref(struct batadv_hard_iface *hard_iface) +static inline void batadv_hardif_put(struct batadv_hard_iface *hard_iface) { - if (atomic_dec_and_test(&hard_iface->refcount)) - call_rcu(&hard_iface->rcu, batadv_hardif_free_rcu); + kref_put(&hard_iface->refcount, batadv_hardif_release); } static inline struct batadv_hard_iface * @@ -85,7 +83,7 @@ batadv_primary_if_get_selected(struct batadv_priv *bat_priv) if (!hard_iface) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) + if (!kref_get_unless_zero(&hard_iface->refcount)) hard_iface = NULL; out: diff --git a/net/batman-adv/hash.c b/net/batman-adv/hash.c index 2ea6a18d793f..a0a0fdb85805 100644 --- a/net/batman-adv/hash.c +++ b/net/batman-adv/hash.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2006-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich, Marek Lindner * diff --git a/net/batman-adv/hash.h b/net/batman-adv/hash.h index 377626250ac7..9bb57b87447c 100644 --- a/net/batman-adv/hash.h +++ b/net/batman-adv/hash.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2006-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2006-2016 B.A.T.M.A.N. contributors: * * Simon Wunderlich, Marek Lindner * @@ -30,14 +30,17 @@ struct lock_class_key; /* callback to a compare function. should compare 2 element datas for their - * keys, return 0 if same and not 0 if not same + * keys + * + * Return: 0 if same and not 0 if not same */ typedef int (*batadv_hashdata_compare_cb)(const struct hlist_node *, const void *); -/* the hashfunction, should return an index - * based on the key in the data of the first - * argument and the size the second +/* the hashfunction + * + * Return: an index based on the key in the data of the first argument and the + * size the second */ typedef u32 (*batadv_hashdata_choose_cb)(const void *, u32); typedef void (*batadv_hashdata_free_cb)(struct hlist_node *, void *); @@ -96,7 +99,7 @@ static inline void batadv_hash_delete(struct batadv_hashtable *hash, * @data: data passed to the aforementioned callbacks as argument * @data_node: to be added element * - * Returns 0 on success, 1 if the element already is in the hash + * Return: 0 on success, 1 if the element already is in the hash * and -1 on error. */ static inline int batadv_hash_add(struct batadv_hashtable *hash, @@ -139,10 +142,11 @@ out: return ret; } -/* removes data from hash, if found. returns pointer do data on success, so you - * can remove the used structure yourself, or NULL on error . data could be the - * structure you use with just the key filled, we just need the key for - * comparing. +/* removes data from hash, if found. data could be the structure you use with + * just the key filled, we just need the key for comparing. + * + * Return: returns pointer do data on success, so you can remove the used + * structure yourself, or NULL on error */ static inline void *batadv_hash_remove(struct batadv_hashtable *hash, batadv_hashdata_compare_cb compare, diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c index bcabb5e3f4d3..14d0013b387e 100644 --- a/net/batman-adv/icmp_socket.c +++ b/net/batman-adv/icmp_socket.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -278,7 +278,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr); - batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); + batadv_send_unicast_skb(skb, neigh_node); goto out; dst_unreach: @@ -288,11 +288,11 @@ free_skb: kfree_skb(skb); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (neigh_node) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return len; } diff --git a/net/batman-adv/icmp_socket.h b/net/batman-adv/icmp_socket.h index e937143f0b10..618d5de06f20 100644 --- a/net/batman-adv/icmp_socket.h +++ b/net/batman-adv/icmp_socket.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index 4b5d61fbadb1..d64ddb961979 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -29,6 +29,7 @@ #include <linux/ip.h> #include <linux/ipv6.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/module.h> @@ -86,6 +87,7 @@ static int __init batadv_init(void) batadv_recv_handler_init(); + batadv_v_init(); batadv_iv_init(); batadv_nc_init(); @@ -158,6 +160,10 @@ int batadv_mesh_init(struct net_device *soft_iface) INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list); INIT_HLIST_HEAD(&bat_priv->softif_vlan_list); + ret = batadv_v_mesh_init(bat_priv); + if (ret < 0) + goto err; + ret = batadv_originator_init(bat_priv); if (ret < 0) goto err; @@ -200,6 +206,8 @@ void batadv_mesh_free(struct net_device *soft_iface) batadv_purge_outstanding_packets(bat_priv, NULL); batadv_gw_node_free(bat_priv); + + batadv_v_mesh_free(bat_priv); batadv_nc_mesh_free(bat_priv); batadv_dat_free(bat_priv); batadv_bla_free(bat_priv); @@ -233,7 +241,7 @@ void batadv_mesh_free(struct net_device *soft_iface) * @bat_priv: the bat priv with all the soft interface information * @addr: the address to check * - * Returns 'true' if the mac address was found, false otherwise. + * Return: 'true' if the mac address was found, false otherwise. */ bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) { @@ -262,7 +270,7 @@ bool batadv_is_my_mac(struct batadv_priv *bat_priv, const u8 *addr) * function that requires the primary interface * @seq: debugfs table seq_file struct * - * Returns primary interface if found or NULL otherwise. + * Return: primary interface if found or NULL otherwise. */ struct batadv_hard_iface * batadv_seq_print_text_primary_if_get(struct seq_file *seq) @@ -286,7 +294,7 @@ batadv_seq_print_text_primary_if_get(struct seq_file *seq) seq_printf(seq, "BATMAN mesh %s disabled - primary interface not active\n", net_dev->name); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); primary_if = NULL; out: @@ -297,7 +305,7 @@ out: * batadv_max_header_len - calculate maximum encapsulation overhead for a * payload packet * - * Return the maximum encapsulation overhead in bytes. + * Return: the maximum encapsulation overhead in bytes. */ int batadv_max_header_len(void) { @@ -599,6 +607,8 @@ int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) * * payload_ptr must always point to an address in the skb head buffer and not to * a fragment. + * + * Return: big endian crc32c of the checksummed data */ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) { @@ -622,15 +632,26 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr) } /** - * batadv_tvlv_handler_free_ref - decrement the tvlv handler refcounter and - * possibly free it + * batadv_tvlv_handler_release - release tvlv handler from lists and queue for + * free after rcu grace period + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_handler_release(struct kref *ref) +{ + struct batadv_tvlv_handler *tvlv_handler; + + tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount); + kfree_rcu(tvlv_handler, rcu); +} + +/** + * batadv_tvlv_handler_put - decrement the tvlv container refcounter and + * possibly release it * @tvlv_handler: the tvlv handler to free */ -static void -batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) +static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler) { - if (atomic_dec_and_test(&tvlv_handler->refcount)) - kfree_rcu(tvlv_handler, rcu); + kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release); } /** @@ -640,7 +661,7 @@ batadv_tvlv_handler_free_ref(struct batadv_tvlv_handler *tvlv_handler) * @type: tvlv handler type to look for * @version: tvlv handler version to look for * - * Returns tvlv handler if found or NULL otherwise. + * Return: tvlv handler if found or NULL otherwise. */ static struct batadv_tvlv_handler *batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version) @@ -656,7 +677,7 @@ static struct batadv_tvlv_handler if (tvlv_handler_tmp->version != version) continue; - if (!atomic_inc_not_zero(&tvlv_handler_tmp->refcount)) + if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount)) continue; tvlv_handler = tvlv_handler_tmp; @@ -668,14 +689,25 @@ static struct batadv_tvlv_handler } /** - * batadv_tvlv_container_free_ref - decrement the tvlv container refcounter and - * possibly free it + * batadv_tvlv_container_release - release tvlv from lists and free + * @ref: kref pointer of the tvlv + */ +static void batadv_tvlv_container_release(struct kref *ref) +{ + struct batadv_tvlv_container *tvlv; + + tvlv = container_of(ref, struct batadv_tvlv_container, refcount); + kfree(tvlv); +} + +/** + * batadv_tvlv_container_put - decrement the tvlv container refcounter and + * possibly release it * @tvlv: the tvlv container to free */ -static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) +static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv) { - if (atomic_dec_and_test(&tvlv->refcount)) - kfree(tvlv); + kref_put(&tvlv->refcount, batadv_tvlv_container_release); } /** @@ -688,13 +720,15 @@ static void batadv_tvlv_container_free_ref(struct batadv_tvlv_container *tvlv) * Has to be called with the appropriate locks being acquired * (tvlv.container_list_lock). * - * Returns tvlv container if found or NULL otherwise. + * Return: tvlv container if found or NULL otherwise. */ static struct batadv_tvlv_container *batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version) { struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL; + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) { if (tvlv_tmp->tvlv_hdr.type != type) continue; @@ -702,7 +736,7 @@ static struct batadv_tvlv_container if (tvlv_tmp->tvlv_hdr.version != version) continue; - if (!atomic_inc_not_zero(&tvlv_tmp->refcount)) + if (!kref_get_unless_zero(&tvlv_tmp->refcount)) continue; tvlv = tvlv_tmp; @@ -720,13 +754,15 @@ static struct batadv_tvlv_container * Has to be called with the appropriate locks being acquired * (tvlv.container_list_lock). * - * Returns size of all currently registered tvlv containers in bytes. + * Return: size of all currently registered tvlv containers in bytes. */ static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv) { struct batadv_tvlv_container *tvlv; u16 tvlv_len = 0; + lockdep_assert_held(&bat_priv->tvlv.container_list_lock); + hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) { tvlv_len += sizeof(struct batadv_tvlv_hdr); tvlv_len += ntohs(tvlv->tvlv_hdr.len); @@ -755,8 +791,8 @@ static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv, hlist_del(&tvlv->list); /* first call to decrement the counter, second call to free */ - batadv_tvlv_container_free_ref(tvlv); - batadv_tvlv_container_free_ref(tvlv); + batadv_tvlv_container_put(tvlv); + batadv_tvlv_container_put(tvlv); } /** @@ -808,7 +844,7 @@ void batadv_tvlv_container_register(struct batadv_priv *bat_priv, memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len)); INIT_HLIST_NODE(&tvlv_new->list); - atomic_set(&tvlv_new->refcount, 1); + kref_init(&tvlv_new->refcount); spin_lock_bh(&bat_priv->tvlv.container_list_lock); tvlv_old = batadv_tvlv_container_get(bat_priv, type, version); @@ -826,7 +862,7 @@ void batadv_tvlv_container_register(struct batadv_priv *bat_priv, * @additional_packet_len: requested additional packet size on top of minimum * size * - * Returns true of the packet buffer could be changed to the requested size, + * Return: true of the packet buffer could be changed to the requested size, * false otherwise. */ static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, @@ -862,7 +898,7 @@ static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff, * The ogm packet might be enlarged or shrunk depending on the current size * and the size of the to-be-appended tvlv containers. * - * Returns size of all appended tvlv containers in bytes. + * Return: size of all appended tvlv containers in bytes. */ u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv, unsigned char **packet_buff, @@ -915,7 +951,7 @@ end: * @tvlv_value: tvlv content * @tvlv_value_len: tvlv content length * - * Returns success if handler was not found or the return value of the handler + * Return: success if handler was not found or the return value of the handler * callback. */ static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, @@ -968,7 +1004,7 @@ static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv, * @tvlv_value: tvlv content * @tvlv_value_len: tvlv content length * - * Returns success when processing an OGM or the return value of all called + * Return: success when processing an OGM or the return value of all called * handler callbacks. */ int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, @@ -1001,7 +1037,7 @@ int batadv_tvlv_containers_process(struct batadv_priv *bat_priv, src, dst, tvlv_value, tvlv_value_cont_len); if (tvlv_handler) - batadv_tvlv_handler_free_ref(tvlv_handler); + batadv_tvlv_handler_put(tvlv_handler); tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len; tvlv_value_len -= tvlv_value_cont_len; } @@ -1081,7 +1117,7 @@ void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version); if (tvlv_handler) { - batadv_tvlv_handler_free_ref(tvlv_handler); + batadv_tvlv_handler_put(tvlv_handler); return; } @@ -1094,7 +1130,7 @@ void batadv_tvlv_handler_register(struct batadv_priv *bat_priv, tvlv_handler->type = type; tvlv_handler->version = version; tvlv_handler->flags = flags; - atomic_set(&tvlv_handler->refcount, 1); + kref_init(&tvlv_handler->refcount); INIT_HLIST_NODE(&tvlv_handler->list); spin_lock_bh(&bat_priv->tvlv.handler_list_lock); @@ -1118,11 +1154,11 @@ void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv, if (!tvlv_handler) return; - batadv_tvlv_handler_free_ref(tvlv_handler); + batadv_tvlv_handler_put(tvlv_handler); spin_lock_bh(&bat_priv->tvlv.handler_list_lock); hlist_del_rcu(&tvlv_handler->list); spin_unlock_bh(&bat_priv->tvlv.handler_list_lock); - batadv_tvlv_handler_free_ref(tvlv_handler); + batadv_tvlv_handler_put(tvlv_handler); } /** @@ -1182,7 +1218,7 @@ void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src, if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP) kfree_skb(skb); out: - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } /** @@ -1190,8 +1226,8 @@ out: * @skb: the buffer containing the packet * @header_len: length of the batman header preceding the ethernet header * - * If the packet embedded in the skb is vlan tagged this function returns the - * VID with the BATADV_VLAN_HAS_TAG flag. Otherwise BATADV_NO_FLAGS is returned. + * Return: VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the + * skb is vlan tagged. Otherwise BATADV_NO_FLAGS. */ unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) { @@ -1218,7 +1254,7 @@ unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len) * @vid: the VLAN identifier for which the AP isolation attributed as to be * looked up * - * Returns true if AP isolation is on for the VLAN idenfied by vid, false + * Return: true if AP isolation is on for the VLAN idenfied by vid, false * otherwise */ bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) @@ -1232,7 +1268,7 @@ bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid) vlan = batadv_softif_vlan_get(bat_priv, vid); if (vlan) { ap_isolation_enabled = atomic_read(&vlan->ap_isolation); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); } return ap_isolation_enabled; diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h index 9dbd9107e7e1..db4533631834 100644 --- a/net/batman-adv/main.h +++ b/net/batman-adv/main.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -24,17 +24,21 @@ #define BATADV_DRIVER_DEVICE "batman-adv" #ifndef BATADV_SOURCE_VERSION -#define BATADV_SOURCE_VERSION "2016.0" +#define BATADV_SOURCE_VERSION "2016.1" #endif /* B.A.T.M.A.N. parameters */ #define BATADV_TQ_MAX_VALUE 255 +#define BATADV_THROUGHPUT_MAX_VALUE 0xFFFFFFFF #define BATADV_JITTER 20 /* Time To Live of broadcast messages */ #define BATADV_TTL 50 +/* maximum sequence number age of broadcast messages */ +#define BATADV_BCAST_MAX_AGE 64 + /* purge originators after time in seconds if no valid packet comes in * -> TODO: check influence on BATADV_TQ_LOCAL_WINDOW_SIZE */ @@ -57,6 +61,15 @@ #define BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM 1 #define BATADV_TQ_TOTAL_BIDRECT_LIMIT 1 +/* B.A.T.M.A.N. V */ +#define BATADV_THROUGHPUT_DEFAULT_VALUE 10 /* 1 Mbps */ +#define BATADV_ELP_PROBES_PER_NODE 2 +#define BATADV_ELP_MIN_PROBE_SIZE 200 /* bytes */ +#define BATADV_ELP_PROBE_MAX_TX_DIFF 100 /* milliseconds */ +#define BATADV_ELP_MAX_AGE 64 +#define BATADV_OGM_MAX_ORIGDIFF 5 +#define BATADV_OGM_MAX_AGE 64 + /* number of OGMs sent with the last tt diff */ #define BATADV_TT_OGM_APPEND_MAX 3 @@ -97,11 +110,6 @@ */ #define BATADV_TQ_SIMILARITY_THRESHOLD 50 -/* how much worse secondary interfaces may be to be considered as bonding - * candidates - */ -#define BATADV_BONDING_TQ_THRESHOLD 50 - /* should not be bigger than 512 bytes or change the size of * forw_packet->direct_link_flags */ @@ -273,9 +281,14 @@ static inline void _batadv_dbg(int type __always_unused, pr_err("%s: " fmt, _netdev->name, ## arg); \ } while (0) -/* returns 1 if they are the same ethernet addr +/** + * batadv_compare_eth - Compare two not u16 aligned Ethernet addresses + * @data1: Pointer to a six-byte array containing the Ethernet address + * @data2: Pointer other six-byte array containing the Ethernet address * * note: can't use ether_addr_equal() as it requires aligned memory + * + * Return: 1 if they are the same ethernet addr */ static inline bool batadv_compare_eth(const void *data1, const void *data2) { @@ -287,7 +300,7 @@ static inline bool batadv_compare_eth(const void *data1, const void *data2) * @timestamp: base value to compare with (in jiffies) * @timeout: added to base value before comparing (in milliseconds) * - * Returns true if current time is after timestamp + timeout + * Return: true if current time is after timestamp + timeout */ static inline bool batadv_has_timed_out(unsigned long timestamp, unsigned int timeout) @@ -326,7 +339,13 @@ static inline void batadv_add_counter(struct batadv_priv *bat_priv, size_t idx, #define batadv_inc_counter(b, i) batadv_add_counter(b, i, 1) -/* Sum and return the cpu-local counters for index 'idx' */ +/** + * batadv_sum_counter - Sum the cpu-local counters for index 'idx' + * @bat_priv: the bat priv with all the soft interface information + * @idx: index of counter to sum up + * + * Return: sum of all cpu-local counters + */ static inline u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) { u64 *counters, sum = 0; diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 75fa5013af72..8caa2c72efa3 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2014-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2014-2016 B.A.T.M.A.N. contributors: * * Linus Lüssing * @@ -30,6 +30,7 @@ #include <linux/in.h> #include <linux/ip.h> #include <linux/ipv6.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -55,7 +56,7 @@ * Collect multicast addresses of the local multicast listeners * on the given soft interface, dev, in the given mcast_list. * - * Returns -ENOMEM on memory allocation error or the number of + * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ static int batadv_mcast_mla_softif_get(struct net_device *dev, @@ -87,7 +88,7 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev, * @mcast_addr: the multicast address to check * @mcast_list: the list with multicast addresses to search in * - * Returns true if the given address is already in the given list. + * Return: true if the given address is already in the given list. * Otherwise returns false. */ static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, @@ -195,8 +196,9 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, * batadv_mcast_has_bridge - check whether the soft-iface is bridged * @bat_priv: the bat priv with all the soft interface information * - * Checks whether there is a bridge on top of our soft interface. Returns - * true if so, false otherwise. + * Checks whether there is a bridge on top of our soft interface. + * + * Return: true if there is a bridge, false otherwise. */ static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) { @@ -218,7 +220,7 @@ static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) * Updates the own multicast tvlv with our current multicast related settings, * capabilities and inabilities. * - * Returns true if the tvlv container is registered afterwards. Otherwise + * Return: true if the tvlv container is registered afterwards. Otherwise * returns false. */ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) @@ -289,8 +291,8 @@ out: * Checks whether the given IPv4 packet has the potential to be forwarded with a * mode more optimal than classic flooding. * - * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM in case of - * memory allocation failure. + * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory + * allocation failure. */ static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -327,8 +329,7 @@ static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, * Checks whether the given IPv6 packet has the potential to be forwarded with a * mode more optimal than classic flooding. * - * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out - * of memory. + * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory */ static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -366,8 +367,7 @@ static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, * Checks whether the given multicast ethernet frame has the potential to be * forwarded with a mode more optimal than classic flooding. * - * If so then returns 0. Otherwise -EINVAL is returned or -ENOMEM if we are out - * of memory. + * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory */ static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -398,7 +398,7 @@ static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @ethhdr: ethernet header of a packet * - * Returns the number of nodes which want all IPv4 multicast traffic if the + * Return: the number of nodes which want all IPv4 multicast traffic if the * given ethhdr is from an IPv4 packet or the number of nodes which want all * IPv6 traffic if it matches an IPv6 packet. */ @@ -421,7 +421,7 @@ static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @ethhdr: the ether header containing the multicast destination * - * Returns an orig_node matching the multicast address provided by ethhdr + * Return: an orig_node matching the multicast address provided by ethhdr * via a translation table lookup. This increases the returned nodes refcount. */ static struct batadv_orig_node * @@ -436,7 +436,7 @@ batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, * batadv_mcast_want_forw_ipv4_node_get - get a node with an ipv4 flag * @bat_priv: the bat priv with all the soft interface information * - * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and * increases its refcount. */ static struct batadv_orig_node * @@ -448,7 +448,7 @@ batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) hlist_for_each_entry_rcu(tmp_orig_node, &bat_priv->mcast.want_all_ipv4_list, mcast_want_all_ipv4_node) { - if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) continue; orig_node = tmp_orig_node; @@ -463,7 +463,7 @@ batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) * batadv_mcast_want_forw_ipv6_node_get - get a node with an ipv6 flag * @bat_priv: the bat priv with all the soft interface information * - * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set * and increases its refcount. */ static struct batadv_orig_node * @@ -475,7 +475,7 @@ batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) hlist_for_each_entry_rcu(tmp_orig_node, &bat_priv->mcast.want_all_ipv6_list, mcast_want_all_ipv6_node) { - if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) continue; orig_node = tmp_orig_node; @@ -491,7 +491,7 @@ batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) * @bat_priv: the bat priv with all the soft interface information * @ethhdr: an ethernet header to determine the protocol family from * - * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, set and * increases its refcount. */ @@ -514,7 +514,7 @@ batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, * batadv_mcast_want_forw_unsnoop_node_get - get a node with an unsnoopable flag * @bat_priv: the bat priv with all the soft interface information * - * Returns an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag + * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag * set and increases its refcount. */ static struct batadv_orig_node * @@ -526,7 +526,7 @@ batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) hlist_for_each_entry_rcu(tmp_orig_node, &bat_priv->mcast.want_all_unsnoopables_list, mcast_want_all_unsnoopables_node) { - if (!atomic_inc_not_zero(&tmp_orig_node->refcount)) + if (!kref_get_unless_zero(&tmp_orig_node->refcount)) continue; orig_node = tmp_orig_node; @@ -543,7 +543,7 @@ batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) * @skb: The multicast packet to check * @orig: an originator to be set to forward the skb to * - * Returns the forwarding mode as enum batadv_forw_mode and in case of + * Return: the forwarding mode as enum batadv_forw_mode and in case of * BATADV_FORW_SINGLE set the orig to the single originator the skb * should be forwarded to. */ diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h index 8f3cb04b9f13..80bceec55592 100644 --- a/net/batman-adv/multicast.h +++ b/net/batman-adv/multicast.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2014-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2014-2016 B.A.T.M.A.N. contributors: * * Linus Lüssing * @@ -23,7 +23,7 @@ struct sk_buff; /** - * batadv_forw_mode - the way a packet should be forwarded as + * enum batadv_forw_mode - the way a packet should be forwarded as * @BATADV_FORW_ALL: forward the packet to all nodes (currently via classic * flooding) * @BATADV_FORW_SINGLE: forward the packet to a single node (currently via the diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c index cc63b44f0d2e..b41719b6487a 100644 --- a/net/batman-adv/network-coding.c +++ b/net/batman-adv/network-coding.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2012-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors: * * Martin Hundebøll, Jeppe Ledet-Pedersen * @@ -32,6 +32,7 @@ #include <linux/jhash.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -64,6 +65,8 @@ static int batadv_nc_recv_coded_packet(struct sk_buff *skb, /** * batadv_nc_init - one-time initialization for network coding + * + * Return: 0 on success or negative error number in case of failure */ int __init batadv_nc_init(void) { @@ -142,6 +145,8 @@ static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, /** * batadv_nc_mesh_init - initialise coding hash table and start house keeping * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure */ int batadv_nc_mesh_init(struct batadv_priv *bat_priv) { @@ -205,34 +210,50 @@ void batadv_nc_init_orig(struct batadv_orig_node *orig_node) /** * batadv_nc_node_release - release nc_node from lists and queue for free after * rcu grace period - * @nc_node: the nc node to free + * @ref: kref pointer of the nc_node */ -static void batadv_nc_node_release(struct batadv_nc_node *nc_node) +static void batadv_nc_node_release(struct kref *ref) { - batadv_orig_node_free_ref(nc_node->orig_node); + struct batadv_nc_node *nc_node; + + nc_node = container_of(ref, struct batadv_nc_node, refcount); + + batadv_orig_node_put(nc_node->orig_node); kfree_rcu(nc_node, rcu); } /** - * batadv_nc_node_free_ref - decrement the nc node refcounter and possibly + * batadv_nc_node_put - decrement the nc_node refcounter and possibly * release it - * @nc_node: the nc node to free + * @nc_node: nc_node to be free'd */ -static void batadv_nc_node_free_ref(struct batadv_nc_node *nc_node) +static void batadv_nc_node_put(struct batadv_nc_node *nc_node) { - if (atomic_dec_and_test(&nc_node->refcount)) - batadv_nc_node_release(nc_node); + kref_put(&nc_node->refcount, batadv_nc_node_release); } /** - * batadv_nc_path_free_ref - decrements the nc path refcounter and possibly - * frees it - * @nc_path: the nc node to free + * batadv_nc_path_release - release nc_path from lists and queue for free after + * rcu grace period + * @ref: kref pointer of the nc_path */ -static void batadv_nc_path_free_ref(struct batadv_nc_path *nc_path) +static void batadv_nc_path_release(struct kref *ref) { - if (atomic_dec_and_test(&nc_path->refcount)) - kfree_rcu(nc_path, rcu); + struct batadv_nc_path *nc_path; + + nc_path = container_of(ref, struct batadv_nc_path, refcount); + + kfree_rcu(nc_path, rcu); +} + +/** + * batadv_nc_path_put - decrement the nc_path refcounter and possibly + * release it + * @nc_path: nc_path to be free'd + */ +static void batadv_nc_path_put(struct batadv_nc_path *nc_path) +{ + kref_put(&nc_path->refcount, batadv_nc_path_release); } /** @@ -242,7 +263,7 @@ static void batadv_nc_path_free_ref(struct batadv_nc_path *nc_path) static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet) { kfree_skb(nc_packet->skb); - batadv_nc_path_free_ref(nc_packet->nc_path); + batadv_nc_path_put(nc_packet->nc_path); kfree(nc_packet); } @@ -251,7 +272,7 @@ static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet) * @bat_priv: the bat priv with all the soft interface information * @nc_node: the nc node to check * - * Returns true if the entry has to be purged now, false otherwise + * Return: true if the entry has to be purged now, false otherwise */ static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, struct batadv_nc_node *nc_node) @@ -267,7 +288,7 @@ static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @nc_path: the nc path to check * - * Returns true if the entry has to be purged now, false otherwise + * Return: true if the entry has to be purged now, false otherwise */ static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, struct batadv_nc_path *nc_path) @@ -287,7 +308,7 @@ static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @nc_path: the nc path to check * - * Returns true if the entry has to be purged now, false otherwise + * Return: true if the entry has to be purged now, false otherwise */ static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, struct batadv_nc_path *nc_path) @@ -335,7 +356,7 @@ batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, "Removing nc_node %pM -> %pM\n", nc_node->addr, nc_node->orig_node->orig); list_del_rcu(&nc_node->list); - batadv_nc_node_free_ref(nc_node); + batadv_nc_node_put(nc_node); } spin_unlock_bh(lock); } @@ -446,7 +467,7 @@ static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, "Remove nc_path %pM -> %pM\n", nc_path->prev_hop, nc_path->next_hop); hlist_del_rcu(&nc_path->hash_entry); - batadv_nc_path_free_ref(nc_path); + batadv_nc_path_put(nc_path); } spin_unlock_bh(lock); } @@ -470,7 +491,7 @@ static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, * @data: data to hash * @size: size of the hash table * - * Returns the selected index in the hash table for the given data. + * Return: the selected index in the hash table for the given data. */ static u32 batadv_nc_hash_choose(const void *data, u32 size) { @@ -489,7 +510,7 @@ static u32 batadv_nc_hash_choose(const void *data, u32 size) * @node: node in the local table * @data2: second object to compare the node to * - * Returns 1 if the two entry are the same, 0 otherwise + * Return: 1 if the two entry are the same, 0 otherwise */ static int batadv_nc_hash_compare(const struct hlist_node *node, const void *data2) @@ -516,7 +537,7 @@ static int batadv_nc_hash_compare(const struct hlist_node *node, * @hash: hash table containing the nc path * @data: search key * - * Returns the nc_path if found, NULL otherwise. + * Return: the nc_path if found, NULL otherwise. */ static struct batadv_nc_path * batadv_nc_hash_find(struct batadv_hashtable *hash, @@ -537,7 +558,7 @@ batadv_nc_hash_find(struct batadv_hashtable *hash, if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) continue; - if (!atomic_inc_not_zero(&nc_path->refcount)) + if (!kref_get_unless_zero(&nc_path->refcount)) continue; nc_path_tmp = nc_path; @@ -554,9 +575,7 @@ batadv_nc_hash_find(struct batadv_hashtable *hash, */ static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) { - batadv_send_skb_packet(nc_packet->skb, - nc_packet->neigh_node->if_incoming, - nc_packet->nc_path->next_hop); + batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); nc_packet->skb = NULL; batadv_nc_packet_free(nc_packet); } @@ -571,7 +590,7 @@ static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) * timeout. If so, the packet is no longer kept and the entry deleted from the * queue. Has to be called with the appropriate locks. * - * Returns false as soon as the entry in the fifo queue has not been timed out + * Return: false as soon as the entry in the fifo queue has not been timed out * yet and true otherwise. */ static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, @@ -610,7 +629,7 @@ out: * packet is no longer delayed, immediately sent and the entry deleted from the * queue. Has to be called with the appropriate locks. * - * Returns false as soon as the entry in the fifo queue has not been timed out + * Return: false as soon as the entry in the fifo queue has not been timed out * yet and true otherwise. */ static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, @@ -731,7 +750,7 @@ static void batadv_nc_worker(struct work_struct *work) * @orig_node: neighboring orig node which may be used as nc candidate * @ogm_packet: incoming ogm packet also used for the checks * - * Returns true if: + * Return: true if: * 1) The OGM must have the most recent sequence number. * 2) The TTL must be decremented by one and only one. * 3) The OGM must be received from the first hop from orig_node. @@ -751,7 +770,7 @@ static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, last_ttl = orig_ifinfo->last_ttl; last_real_seqno = orig_ifinfo->last_real_seqno; - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); if (last_real_seqno != ntohl(ogm_packet->seqno)) return false; @@ -772,7 +791,7 @@ static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, * (can be equal to orig_node) * @in_coding: traverse incoming or outgoing network coding list * - * Returns the nc_node if found, NULL otherwise. + * Return: the nc_node if found, NULL otherwise. */ static struct batadv_nc_node *batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, @@ -793,7 +812,7 @@ static struct batadv_nc_node if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) continue; - if (!atomic_inc_not_zero(&nc_node->refcount)) + if (!kref_get_unless_zero(&nc_node->refcount)) continue; /* Found a match */ @@ -814,7 +833,7 @@ static struct batadv_nc_node * (can be equal to orig_node) * @in_coding: traverse incoming or outgoing network coding list * - * Returns the nc_node if found or created, NULL in case of an error. + * Return: the nc_node if found or created, NULL in case of an error. */ static struct batadv_nc_node *batadv_nc_get_nc_node(struct batadv_priv *bat_priv, @@ -837,14 +856,15 @@ static struct batadv_nc_node if (!nc_node) return NULL; - if (!atomic_inc_not_zero(&orig_neigh_node->refcount)) + if (!kref_get_unless_zero(&orig_neigh_node->refcount)) goto free; /* Initialize nc_node */ INIT_LIST_HEAD(&nc_node->list); ether_addr_copy(nc_node->addr, orig_node->orig); nc_node->orig_node = orig_neigh_node; - atomic_set(&nc_node->refcount, 2); + kref_init(&nc_node->refcount); + kref_get(&nc_node->refcount); /* Select ingoing or outgoing coding node */ if (in_coding) { @@ -920,9 +940,9 @@ void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, out: if (in_nc_node) - batadv_nc_node_free_ref(in_nc_node); + batadv_nc_node_put(in_nc_node); if (out_nc_node) - batadv_nc_node_free_ref(out_nc_node); + batadv_nc_node_put(out_nc_node); } /** @@ -932,7 +952,7 @@ out: * @src: ethernet source address - first half of the nc path search key * @dst: ethernet destination address - second half of the nc path search key * - * Returns pointer to nc_path if the path was found or created, returns NULL + * Return: pointer to nc_path if the path was found or created, returns NULL * on error. */ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, @@ -963,7 +983,8 @@ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, /* Initialize nc_path */ INIT_LIST_HEAD(&nc_path->packet_list); spin_lock_init(&nc_path->packet_list_lock); - atomic_set(&nc_path->refcount, 2); + kref_init(&nc_path->refcount); + kref_get(&nc_path->refcount); nc_path->last_valid = jiffies; ether_addr_copy(nc_path->next_hop, dst); ether_addr_copy(nc_path->prev_hop, src); @@ -989,6 +1010,8 @@ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair * selection of a receiver with slightly lower TQ than the other * @tq: to be weighted tq value + * + * Return: scaled tq value */ static u8 batadv_nc_random_weight_tq(u8 tq) { @@ -1029,7 +1052,7 @@ static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) * @nc_packet: structure containing the packet to the skb can be coded with * @neigh_node: next hop to forward packet to * - * Returns true if both packets are consumed, false otherwise. + * Return: true if both packets are consumed, false otherwise. */ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -1042,11 +1065,11 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, struct batadv_unicast_packet *packet1; struct batadv_unicast_packet *packet2; struct batadv_coded_packet *coded_packet; - struct batadv_neigh_node *neigh_tmp, *router_neigh; - struct batadv_neigh_node *router_coding = NULL; + struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; + struct batadv_neigh_node *router_coding = NULL, *second_dest; struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; - u8 *first_source, *first_dest, *second_source, *second_dest; + u8 *first_source, *second_source; __be32 packet_id1, packet_id2; size_t count; bool res = false; @@ -1089,9 +1112,9 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, */ if (tq_weighted_neigh >= tq_weighted_coding) { /* Destination from nc_packet is selected for MAC-header */ - first_dest = nc_packet->nc_path->next_hop; + first_dest = nc_packet->neigh_node; first_source = nc_packet->nc_path->prev_hop; - second_dest = neigh_node->addr; + second_dest = neigh_node; second_source = ethhdr->h_source; packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; packet2 = (struct batadv_unicast_packet *)skb->data; @@ -1100,9 +1123,9 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, skb->data + sizeof(*packet2)); } else { /* Destination for skb is selected for MAC-header */ - first_dest = neigh_node->addr; + first_dest = neigh_node; first_source = ethhdr->h_source; - second_dest = nc_packet->nc_path->next_hop; + second_dest = nc_packet->neigh_node; second_source = nc_packet->nc_path->prev_hop; packet1 = (struct batadv_unicast_packet *)skb->data; packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; @@ -1144,7 +1167,7 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, coded_packet->first_ttvn = packet1->ttvn; /* Info about second unicast packet */ - ether_addr_copy(coded_packet->second_dest, second_dest); + ether_addr_copy(coded_packet->second_dest, second_dest->addr); ether_addr_copy(coded_packet->second_source, second_source); ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); coded_packet->second_crc = packet_id2; @@ -1199,17 +1222,17 @@ static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, batadv_nc_packet_free(nc_packet); /* Send the coded packet and return true */ - batadv_send_skb_packet(skb_dest, neigh_node->if_incoming, first_dest); + batadv_send_unicast_skb(skb_dest, first_dest); res = true; out: if (router_neigh) - batadv_neigh_node_free_ref(router_neigh); + batadv_neigh_node_put(router_neigh); if (router_coding) - batadv_neigh_node_free_ref(router_coding); + batadv_neigh_node_put(router_coding); if (router_neigh_ifinfo) - batadv_neigh_ifinfo_free_ref(router_neigh_ifinfo); + batadv_neigh_ifinfo_put(router_neigh_ifinfo); if (router_coding_ifinfo) - batadv_neigh_ifinfo_free_ref(router_coding_ifinfo); + batadv_neigh_ifinfo_put(router_coding_ifinfo); return res; } @@ -1228,7 +1251,7 @@ out: * Since the source encoded the packet we can be certain it has all necessary * decode information. * - * Returns true if coding of a decoded packet is allowed. + * Return: true if coding of a decoded packet is allowed. */ static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) { @@ -1246,7 +1269,7 @@ static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) * @skb: data skb to forward * @eth_dst: next hop mac address of skb * - * Returns true if coding of a decoded skb is allowed. + * Return: true if coding of a decoded skb is allowed. */ static struct batadv_nc_packet * batadv_nc_path_search(struct batadv_priv *bat_priv, @@ -1314,7 +1337,7 @@ batadv_nc_path_search(struct batadv_priv *bat_priv, * @eth_src: source mac address of skb * @in_nc_node: pointer to skb next hop's neighbor nc node * - * Returns an nc packet if a suitable coding packet was found, NULL otherwise. + * Return: an nc packet if a suitable coding packet was found, NULL otherwise. */ static struct batadv_nc_packet * batadv_nc_skb_src_search(struct batadv_priv *bat_priv, @@ -1347,7 +1370,7 @@ batadv_nc_skb_src_search(struct batadv_priv *bat_priv, } rcu_read_unlock(); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return nc_packet; } @@ -1397,7 +1420,7 @@ static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, * next hop that potentially sent a packet which our next hop also received * (overheard) and has stored for later decoding. * - * Returns true if the skb was consumed (encoded packet sent) or false otherwise + * Return: true if the skb was consumed (encoded packet sent) or false otherwise */ static bool batadv_nc_skb_dst_search(struct sk_buff *skb, struct batadv_neigh_node *neigh_node, @@ -1451,7 +1474,7 @@ static bool batadv_nc_skb_dst_search(struct sk_buff *skb, * @neigh_node: next hop to forward packet to * @packet_id: checksum to identify packet * - * Returns true if the packet was buffered or false in case of an error. + * Return: true if the packet was buffered or false in case of an error. */ static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, struct batadv_nc_path *nc_path, @@ -1485,7 +1508,7 @@ static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, * @skb: data skb to forward * @neigh_node: next hop to forward packet to * - * Returns true if the skb was consumed (encoded packet sent) or false otherwise + * Return: true if the skb was consumed (encoded packet sent) or false otherwise */ bool batadv_nc_skb_forward(struct sk_buff *skb, struct batadv_neigh_node *neigh_node) @@ -1530,7 +1553,7 @@ bool batadv_nc_skb_forward(struct sk_buff *skb, return true; free_nc_path: - batadv_nc_path_free_ref(nc_path); + batadv_nc_path_put(nc_path); out: /* Packet is not consumed */ return false; @@ -1592,7 +1615,7 @@ void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, free_skb: kfree_skb(skb); free_nc_path: - batadv_nc_path_free_ref(nc_path); + batadv_nc_path_put(nc_path); out: return; } @@ -1624,7 +1647,7 @@ void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, * @skb: unicast skb to decode * @nc_packet: decode data needed to decode the skb * - * Returns pointer to decoded unicast packet if the packet was decoded or NULL + * Return: pointer to decoded unicast packet if the packet was decoded or NULL * in case of an error. */ static struct batadv_unicast_packet * @@ -1718,7 +1741,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, * @ethhdr: pointer to the ethernet header inside the coded packet * @coded: coded packet we try to find decode data for * - * Returns pointer to nc packet if the needed data was found or NULL otherwise. + * Return: pointer to nc packet if the needed data was found or NULL otherwise. */ static struct batadv_nc_packet * batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, @@ -1781,6 +1804,9 @@ batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, * resulting unicast packet * @skb: incoming coded packet * @recv_if: pointer to interface this packet was received on + * + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * otherwise. */ static int batadv_nc_recv_coded_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) @@ -1865,6 +1891,8 @@ void batadv_nc_mesh_free(struct batadv_priv *bat_priv) * batadv_nc_nodes_seq_print_text - print the nc node information * @seq: seq file to print on * @offset: not used + * + * Return: always 0 */ int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) { @@ -1920,13 +1948,15 @@ int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } /** * batadv_nc_init_debugfs - create nc folder and related files in debugfs * @bat_priv: the bat priv with all the soft interface information + * + * Return: 0 on success or negative error number in case of failure */ int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) { diff --git a/net/batman-adv/network-coding.h b/net/batman-adv/network-coding.h index 8f6d4ad8778a..d6d7fb4ec5d5 100644 --- a/net/batman-adv/network-coding.h +++ b/net/batman-adv/network-coding.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2012-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors: * * Martin Hundebøll, Jeppe Ledet-Pedersen * diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c index fe578f75c391..c355a824713c 100644 --- a/net/batman-adv/originator.c +++ b/net/batman-adv/originator.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2009-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -18,11 +18,13 @@ #include "originator.h" #include "main.h" +#include <linux/atomic.h> #include <linux/errno.h> #include <linux/etherdevice.h> #include <linux/fs.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -47,7 +49,13 @@ static struct lock_class_key batadv_orig_hash_lock_class_key; static void batadv_purge_orig(struct work_struct *work); -/* returns 1 if they are the same originator */ +/** + * batadv_compare_orig - comparing function used in the originator hash table + * @node: node in the local table + * @data2: second object to compare the node to + * + * Return: 1 if they are the same originator + */ int batadv_compare_orig(const struct hlist_node *node, const void *data2) { const void *data1 = container_of(node, struct batadv_orig_node, @@ -61,7 +69,7 @@ int batadv_compare_orig(const struct hlist_node *node, const void *data2) * @orig_node: the originator serving the VLAN * @vid: the VLAN identifier * - * Returns the vlan object identified by vid and belonging to orig_node or NULL + * Return: the vlan object identified by vid and belonging to orig_node or NULL * if it does not exist. */ struct batadv_orig_node_vlan * @@ -75,7 +83,7 @@ batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, if (tmp->vid != vid) continue; - if (!atomic_inc_not_zero(&tmp->refcount)) + if (!kref_get_unless_zero(&tmp->refcount)) continue; vlan = tmp; @@ -93,7 +101,7 @@ batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, * @orig_node: the originator serving the VLAN * @vid: the VLAN identifier * - * Returns NULL in case of failure or the vlan object identified by vid and + * Return: NULL in case of failure or the vlan object identified by vid and * belonging to orig_node otherwise. The object is created and added to the list * if it does not exist. * @@ -116,7 +124,8 @@ batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, if (!vlan) goto out; - atomic_set(&vlan->refcount, 2); + kref_init(&vlan->refcount); + kref_get(&vlan->refcount); vlan->vid = vid; hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list); @@ -128,14 +137,27 @@ out: } /** - * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free + * batadv_orig_node_vlan_release - release originator-vlan object from lists + * and queue for free after rcu grace period + * @ref: kref pointer of the originator-vlan object + */ +static void batadv_orig_node_vlan_release(struct kref *ref) +{ + struct batadv_orig_node_vlan *orig_vlan; + + orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount); + + kfree_rcu(orig_vlan, rcu); +} + +/** + * batadv_orig_node_vlan_put - decrement the refcounter and possibly release * the originator-vlan object * @orig_vlan: the originator-vlan object to release */ -void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan) +void batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan) { - if (atomic_dec_and_test(&orig_vlan->refcount)) - kfree_rcu(orig_vlan, rcu); + kref_put(&orig_vlan->refcount, batadv_orig_node_vlan_release); } int batadv_originator_init(struct batadv_priv *bat_priv) @@ -165,99 +187,98 @@ err: /** * batadv_neigh_ifinfo_release - release neigh_ifinfo from lists and queue for * free after rcu grace period - * @neigh_ifinfo: the neigh_ifinfo object to release + * @ref: kref pointer of the neigh_ifinfo */ -static void -batadv_neigh_ifinfo_release(struct batadv_neigh_ifinfo *neigh_ifinfo) +static void batadv_neigh_ifinfo_release(struct kref *ref) { + struct batadv_neigh_ifinfo *neigh_ifinfo; + + neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount); + if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) - batadv_hardif_free_ref(neigh_ifinfo->if_outgoing); + batadv_hardif_put(neigh_ifinfo->if_outgoing); kfree_rcu(neigh_ifinfo, rcu); } /** - * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly release + * batadv_neigh_ifinfo_put - decrement the refcounter and possibly release * the neigh_ifinfo * @neigh_ifinfo: the neigh_ifinfo object to release */ -void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo) +void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo) { - if (atomic_dec_and_test(&neigh_ifinfo->refcount)) - batadv_neigh_ifinfo_release(neigh_ifinfo); + kref_put(&neigh_ifinfo->refcount, batadv_neigh_ifinfo_release); } /** * batadv_hardif_neigh_release - release hardif neigh node from lists and * queue for free after rcu grace period - * @hardif_neigh: hardif neigh neighbor to free + * @ref: kref pointer of the neigh_node */ -static void -batadv_hardif_neigh_release(struct batadv_hardif_neigh_node *hardif_neigh) +static void batadv_hardif_neigh_release(struct kref *ref) { + struct batadv_hardif_neigh_node *hardif_neigh; + + hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node, + refcount); + spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); hlist_del_init_rcu(&hardif_neigh->list); spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); - batadv_hardif_free_ref(hardif_neigh->if_incoming); + batadv_hardif_put(hardif_neigh->if_incoming); kfree_rcu(hardif_neigh, rcu); } /** - * batadv_hardif_neigh_free_ref - decrement the hardif neighbors refcounter + * batadv_hardif_neigh_put - decrement the hardif neighbors refcounter * and possibly release it * @hardif_neigh: hardif neigh neighbor to free */ -void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh) +void batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh) { - if (atomic_dec_and_test(&hardif_neigh->refcount)) - batadv_hardif_neigh_release(hardif_neigh); + kref_put(&hardif_neigh->refcount, batadv_hardif_neigh_release); } /** * batadv_neigh_node_release - release neigh_node from lists and queue for * free after rcu grace period - * @neigh_node: neigh neighbor to free + * @ref: kref pointer of the neigh_node */ -static void batadv_neigh_node_release(struct batadv_neigh_node *neigh_node) +static void batadv_neigh_node_release(struct kref *ref) { struct hlist_node *node_tmp; - struct batadv_hardif_neigh_node *hardif_neigh; + struct batadv_neigh_node *neigh_node; struct batadv_neigh_ifinfo *neigh_ifinfo; struct batadv_algo_ops *bao; + neigh_node = container_of(ref, struct batadv_neigh_node, refcount); bao = neigh_node->orig_node->bat_priv->bat_algo_ops; hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, &neigh_node->ifinfo_list, list) { - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); } - hardif_neigh = batadv_hardif_neigh_get(neigh_node->if_incoming, - neigh_node->addr); - if (hardif_neigh) { - /* batadv_hardif_neigh_get() increases refcount too */ - batadv_hardif_neigh_free_ref(hardif_neigh); - batadv_hardif_neigh_free_ref(hardif_neigh); - } + batadv_hardif_neigh_put(neigh_node->hardif_neigh); if (bao->bat_neigh_free) bao->bat_neigh_free(neigh_node); - batadv_hardif_free_ref(neigh_node->if_incoming); + batadv_hardif_put(neigh_node->if_incoming); kfree_rcu(neigh_node, rcu); } /** - * batadv_neigh_node_free_ref - decrement the neighbors refcounter - * and possibly release it + * batadv_neigh_node_put - decrement the neighbors refcounter and possibly + * release it * @neigh_node: neigh neighbor to free */ -void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node) +void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node) { - if (atomic_dec_and_test(&neigh_node->refcount)) - batadv_neigh_node_release(neigh_node); + kref_put(&neigh_node->refcount, batadv_neigh_node_release); } /** @@ -266,7 +287,7 @@ void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node) * @if_outgoing: the interface where the payload packet has been received or * the OGM should be sent to * - * Returns the neighbor which should be router for this orig_node/iface. + * Return: the neighbor which should be router for this orig_node/iface. * * The object is returned with refcounter increased by 1. */ @@ -286,7 +307,7 @@ batadv_orig_router_get(struct batadv_orig_node *orig_node, break; } - if (router && !atomic_inc_not_zero(&router->refcount)) + if (router && !kref_get_unless_zero(&router->refcount)) router = NULL; rcu_read_unlock(); @@ -298,7 +319,7 @@ batadv_orig_router_get(struct batadv_orig_node *orig_node, * @orig_node: the orig node to be queried * @if_outgoing: the interface for which the ifinfo should be acquired * - * Returns the requested orig_ifinfo or NULL if not found. + * Return: the requested orig_ifinfo or NULL if not found. * * The object is returned with refcounter increased by 1. */ @@ -314,7 +335,7 @@ batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, if (tmp->if_outgoing != if_outgoing) continue; - if (!atomic_inc_not_zero(&tmp->refcount)) + if (!kref_get_unless_zero(&tmp->refcount)) continue; orig_ifinfo = tmp; @@ -330,7 +351,7 @@ batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, * @orig_node: the orig node to be queried * @if_outgoing: the interface for which the ifinfo should be acquired * - * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing + * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing * interface otherwise. The object is created and added to the list * if it does not exist. * @@ -354,7 +375,7 @@ batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, goto out; if (if_outgoing != BATADV_IF_DEFAULT && - !atomic_inc_not_zero(&if_outgoing->refcount)) { + !kref_get_unless_zero(&if_outgoing->refcount)) { kfree(orig_ifinfo); orig_ifinfo = NULL; goto out; @@ -365,7 +386,8 @@ batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, orig_ifinfo->batman_seqno_reset = reset_time; orig_ifinfo->if_outgoing = if_outgoing; INIT_HLIST_NODE(&orig_ifinfo->list); - atomic_set(&orig_ifinfo->refcount, 2); + kref_init(&orig_ifinfo->refcount); + kref_get(&orig_ifinfo->refcount); hlist_add_head_rcu(&orig_ifinfo->list, &orig_node->ifinfo_list); out: @@ -375,12 +397,12 @@ out: /** * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node - * @neigh_node: the neigh node to be queried + * @neigh: the neigh node to be queried * @if_outgoing: the interface for which the ifinfo should be acquired * * The object is returned with refcounter increased by 1. * - * Returns the requested neigh_ifinfo or NULL if not found + * Return: the requested neigh_ifinfo or NULL if not found */ struct batadv_neigh_ifinfo * batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, @@ -395,7 +417,7 @@ batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) continue; - if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount)) + if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount)) continue; neigh_ifinfo = tmp_neigh_ifinfo; @@ -408,10 +430,10 @@ batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, /** * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object - * @neigh_node: the neigh node to be queried + * @neigh: the neigh node to be queried * @if_outgoing: the interface for which the ifinfo should be acquired * - * Returns NULL in case of failure or the neigh_ifinfo object for the + * Return: NULL in case of failure or the neigh_ifinfo object for the * if_outgoing interface otherwise. The object is created and added to the list * if it does not exist. * @@ -433,14 +455,15 @@ batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, if (!neigh_ifinfo) goto out; - if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) { + if (if_outgoing && !kref_get_unless_zero(&if_outgoing->refcount)) { kfree(neigh_ifinfo); neigh_ifinfo = NULL; goto out; } INIT_HLIST_NODE(&neigh_ifinfo->list); - atomic_set(&neigh_ifinfo->refcount, 2); + kref_init(&neigh_ifinfo->refcount); + kref_get(&neigh_ifinfo->refcount); neigh_ifinfo->if_outgoing = if_outgoing; hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list); @@ -459,7 +482,8 @@ out: * * Looks for and possibly returns a neighbour belonging to this originator list * which is connected through the provided hard interface. - * Returns NULL if the neighbour is not found. + * + * Return: neighbor when found. Othwerwise NULL */ static struct batadv_neigh_node * batadv_neigh_node_get(const struct batadv_orig_node *orig_node, @@ -476,7 +500,7 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node, if (tmp_neigh_node->if_incoming != hard_iface) continue; - if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) + if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) continue; res = tmp_neigh_node; @@ -492,7 +516,7 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node, * @hard_iface: the interface this neighbour is connected to * @neigh_addr: the interface address of the neighbour to retrieve * - * Returns the hardif neighbour node if found or created or NULL otherwise. + * Return: the hardif neighbour node if found or created or NULL otherwise. */ static struct batadv_hardif_neigh_node * batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, @@ -508,12 +532,12 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, if (hardif_neigh) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) + if (!kref_get_unless_zero(&hard_iface->refcount)) goto out; hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC); if (!hardif_neigh) { - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); goto out; } @@ -522,7 +546,7 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, hardif_neigh->if_incoming = hard_iface; hardif_neigh->last_seen = jiffies; - atomic_set(&hardif_neigh->refcount, 1); + kref_init(&hardif_neigh->refcount); if (bat_priv->bat_algo_ops->bat_hardif_neigh_init) bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh); @@ -540,7 +564,7 @@ out: * @hard_iface: the interface this neighbour is connected to * @neigh_addr: the interface address of the neighbour to retrieve * - * Returns the hardif neighbour node if found or created or NULL otherwise. + * Return: the hardif neighbour node if found or created or NULL otherwise. */ static struct batadv_hardif_neigh_node * batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, @@ -562,7 +586,8 @@ batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, * @neigh_addr: the address of the neighbour * * Looks for and possibly returns a neighbour belonging to this hard interface. - * Returns NULL if the neighbour is not found. + * + * Return: neighbor when found. Othwerwise NULL */ struct batadv_hardif_neigh_node * batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, @@ -576,7 +601,7 @@ batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr)) continue; - if (!atomic_inc_not_zero(&tmp_hardif_neigh->refcount)) + if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount)) continue; hardif_neigh = tmp_hardif_neigh; @@ -594,7 +619,8 @@ batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, * @neigh_addr: the mac address of the neighbour interface * * Allocates a new neigh_node object and initialises all the generic fields. - * Returns the new object or NULL on failure. + * + * Return: neighbor when found. Othwerwise NULL */ struct batadv_neigh_node * batadv_neigh_node_new(struct batadv_orig_node *orig_node, @@ -617,7 +643,7 @@ batadv_neigh_node_new(struct batadv_orig_node *orig_node, if (!neigh_node) goto out; - if (!atomic_inc_not_zero(&hard_iface->refcount)) { + if (!kref_get_unless_zero(&hard_iface->refcount)) { kfree(neigh_node); neigh_node = NULL; goto out; @@ -630,24 +656,27 @@ batadv_neigh_node_new(struct batadv_orig_node *orig_node, ether_addr_copy(neigh_node->addr, neigh_addr); neigh_node->if_incoming = hard_iface; neigh_node->orig_node = orig_node; + neigh_node->last_seen = jiffies; + + /* increment unique neighbor refcount */ + kref_get(&hardif_neigh->refcount); + neigh_node->hardif_neigh = hardif_neigh; /* extra reference for return */ - atomic_set(&neigh_node->refcount, 2); + kref_init(&neigh_node->refcount); + kref_get(&neigh_node->refcount); spin_lock_bh(&orig_node->neigh_list_lock); hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); spin_unlock_bh(&orig_node->neigh_list_lock); - /* increment unique neighbor refcount */ - atomic_inc(&hardif_neigh->refcount); - batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, "Creating new neighbor %pM for orig_node %pM on interface %s\n", neigh_addr, orig_node->orig, hard_iface->net_dev->name); out: if (hardif_neigh) - batadv_hardif_neigh_free_ref(hardif_neigh); + batadv_hardif_neigh_put(hardif_neigh); return neigh_node; } @@ -656,7 +685,7 @@ out: * @seq: neighbour table seq_file struct * @offset: not used * - * Always returns 0. + * Return: always 0 */ int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset) { @@ -673,7 +702,7 @@ int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset) primary_if->net_dev->dev_addr, net_dev->name, bat_priv->bat_algo_ops->name); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (!bat_priv->bat_algo_ops->bat_neigh_print) { seq_puts(seq, @@ -688,32 +717,34 @@ int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset) /** * batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for * free after rcu grace period - * @orig_ifinfo: the orig_ifinfo object to release + * @ref: kref pointer of the orig_ifinfo */ -static void batadv_orig_ifinfo_release(struct batadv_orig_ifinfo *orig_ifinfo) +static void batadv_orig_ifinfo_release(struct kref *ref) { + struct batadv_orig_ifinfo *orig_ifinfo; struct batadv_neigh_node *router; + orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount); + if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) - batadv_hardif_free_ref(orig_ifinfo->if_outgoing); + batadv_hardif_put(orig_ifinfo->if_outgoing); /* this is the last reference to this object */ router = rcu_dereference_protected(orig_ifinfo->router, true); if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); kfree_rcu(orig_ifinfo, rcu); } /** - * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly release + * batadv_orig_ifinfo_put - decrement the refcounter and possibly release * the orig_ifinfo * @orig_ifinfo: the orig_ifinfo object to release */ -void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo) +void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo) { - if (atomic_dec_and_test(&orig_ifinfo->refcount)) - batadv_orig_ifinfo_release(orig_ifinfo); + kref_put(&orig_ifinfo->refcount, batadv_orig_ifinfo_release); } /** @@ -740,27 +771,30 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu) /** * batadv_orig_node_release - release orig_node from lists and queue for * free after rcu grace period - * @orig_node: the orig node to free + * @ref: kref pointer of the orig_node */ -static void batadv_orig_node_release(struct batadv_orig_node *orig_node) +static void batadv_orig_node_release(struct kref *ref) { struct hlist_node *node_tmp; struct batadv_neigh_node *neigh_node; + struct batadv_orig_node *orig_node; struct batadv_orig_ifinfo *orig_ifinfo; + orig_node = container_of(ref, struct batadv_orig_node, refcount); + spin_lock_bh(&orig_node->neigh_list_lock); /* for all neighbors towards this originator ... */ hlist_for_each_entry_safe(neigh_node, node_tmp, &orig_node->neigh_list, list) { hlist_del_rcu(&neigh_node->list); - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); } hlist_for_each_entry_safe(orig_ifinfo, node_tmp, &orig_node->ifinfo_list, list) { hlist_del_rcu(&orig_ifinfo->list); - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); } spin_unlock_bh(&orig_node->neigh_list_lock); @@ -771,14 +805,13 @@ static void batadv_orig_node_release(struct batadv_orig_node *orig_node) } /** - * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly + * batadv_orig_node_put - decrement the orig node refcounter and possibly * release it * @orig_node: the orig node to free */ -void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node) +void batadv_orig_node_put(struct batadv_orig_node *orig_node) { - if (atomic_dec_and_test(&orig_node->refcount)) - batadv_orig_node_release(orig_node); + kref_put(&orig_node->refcount, batadv_orig_node_release); } void batadv_originator_free(struct batadv_priv *bat_priv) @@ -805,7 +838,7 @@ void batadv_originator_free(struct batadv_priv *bat_priv) hlist_for_each_entry_safe(orig_node, node_tmp, head, hash_entry) { hlist_del_rcu(&orig_node->hash_entry); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } spin_unlock_bh(list_lock); } @@ -820,7 +853,8 @@ void batadv_originator_free(struct batadv_priv *bat_priv) * * Creates a new originator object and initialise all the generic fields. * The new object is not added to the originator list. - * Returns the newly created object or NULL on failure. + * + * Return: the newly created object or NULL on failure. */ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, const u8 *addr) @@ -849,7 +883,8 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, batadv_nc_init_orig(orig_node); /* extra reference for return */ - atomic_set(&orig_node->refcount, 2); + kref_init(&orig_node->refcount); + kref_get(&orig_node->refcount); orig_node->bat_priv = bat_priv; ether_addr_copy(orig_node->orig, addr); @@ -877,7 +912,7 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, * Immediately release vlan since it is not needed anymore in this * context */ - batadv_orig_node_vlan_free_ref(vlan); + batadv_orig_node_vlan_put(vlan); for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { INIT_HLIST_HEAD(&orig_node->fragments[i].head); @@ -926,7 +961,7 @@ batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, neigh->addr, if_outgoing->net_dev->name); hlist_del_rcu(&neigh_ifinfo->list); - batadv_neigh_ifinfo_free_ref(neigh_ifinfo); + batadv_neigh_ifinfo_put(neigh_ifinfo); } spin_unlock_bh(&neigh->ifinfo_lock); @@ -937,7 +972,7 @@ batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @orig_node: orig node which is to be checked * - * Returns true if any ifinfo entry was purged, false otherwise. + * Return: true if any ifinfo entry was purged, false otherwise. */ static bool batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, @@ -972,10 +1007,10 @@ batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, ifinfo_purged = true; hlist_del_rcu(&orig_ifinfo->list); - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); if (orig_node->last_bonding_candidate == orig_ifinfo) { orig_node->last_bonding_candidate = NULL; - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); } } @@ -989,7 +1024,7 @@ batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @orig_node: orig node which is to be checked * - * Returns true if any neighbor was purged, false otherwise + * Return: true if any neighbor was purged, false otherwise */ static bool batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, @@ -1029,7 +1064,7 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, neigh_purged = true; hlist_del_rcu(&neigh_node->list); - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); } else { /* only necessary if not the whole neighbor is to be * deleted, but some interface has been removed. @@ -1048,7 +1083,7 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, * @orig_node: orig node which is to be checked * @if_outgoing: the interface for which the metric should be compared * - * Returns the current best neighbor, with refcount increased. + * Return: the current best neighbor, with refcount increased. */ static struct batadv_neigh_node * batadv_find_best_neighbor(struct batadv_priv *bat_priv, @@ -1064,11 +1099,11 @@ batadv_find_best_neighbor(struct batadv_priv *bat_priv, best, if_outgoing) <= 0)) continue; - if (!atomic_inc_not_zero(&neigh->refcount)) + if (!kref_get_unless_zero(&neigh->refcount)) continue; if (best) - batadv_neigh_node_free_ref(best); + batadv_neigh_node_put(best); best = neigh; } @@ -1085,7 +1120,7 @@ batadv_find_best_neighbor(struct batadv_priv *bat_priv, * This function checks if the orig_node or substructures of it have become * obsolete, and purges this information if that's the case. * - * Returns true if the orig_node is to be removed, false otherwise. + * Return: true if the orig_node is to be removed, false otherwise. */ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) @@ -1114,7 +1149,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, best_neigh_node); if (best_neigh_node) - batadv_neigh_node_free_ref(best_neigh_node); + batadv_neigh_node_put(best_neigh_node); /* ... then for all other interfaces. */ rcu_read_lock(); @@ -1131,7 +1166,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, batadv_update_route(bat_priv, orig_node, hard_iface, best_neigh_node); if (best_neigh_node) - batadv_neigh_node_free_ref(best_neigh_node); + batadv_neigh_node_put(best_neigh_node); } rcu_read_unlock(); @@ -1164,7 +1199,7 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv) batadv_tt_global_del_orig(orig_node->bat_priv, orig_node, -1, "originator timed out"); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); continue; } @@ -1210,7 +1245,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) primary_if->net_dev->dev_addr, net_dev->name, bat_priv->bat_algo_ops->name); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (!bat_priv->bat_algo_ops->bat_orig_print) { seq_puts(seq, @@ -1230,7 +1265,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) * @seq: debugfs table seq_file struct * @offset: not used * - * Returns 0 + * Return: 0 */ int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset) { @@ -1266,7 +1301,7 @@ int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset) out: if (hard_iface) - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return 0; } diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h index cf0730414ed2..4e8b67f11051 100644 --- a/net/batman-adv/originator.h +++ b/net/batman-adv/originator.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -20,10 +20,10 @@ #include "main.h" -#include <linux/atomic.h> #include <linux/compiler.h> #include <linux/if_ether.h> #include <linux/jhash.h> +#include <linux/kref.h> #include <linux/rculist.h> #include <linux/rcupdate.h> #include <linux/stddef.h> @@ -37,19 +37,19 @@ int batadv_compare_orig(const struct hlist_node *node, const void *data2); int batadv_originator_init(struct batadv_priv *bat_priv); void batadv_originator_free(struct batadv_priv *bat_priv); void batadv_purge_orig_ref(struct batadv_priv *bat_priv); -void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node); +void batadv_orig_node_put(struct batadv_orig_node *orig_node); struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, const u8 *addr); struct batadv_hardif_neigh_node * batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, const u8 *neigh_addr); void -batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh); +batadv_hardif_neigh_put(struct batadv_hardif_neigh_node *hardif_neigh); struct batadv_neigh_node * batadv_neigh_node_new(struct batadv_orig_node *orig_node, struct batadv_hard_iface *hard_iface, const u8 *neigh_addr); -void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node); +void batadv_neigh_node_put(struct batadv_neigh_node *neigh_node); struct batadv_neigh_node * batadv_orig_router_get(struct batadv_orig_node *orig_node, const struct batadv_hard_iface *if_outgoing); @@ -59,7 +59,7 @@ batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, struct batadv_neigh_ifinfo * batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, struct batadv_hard_iface *if_outgoing); -void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo); +void batadv_neigh_ifinfo_put(struct batadv_neigh_ifinfo *neigh_ifinfo); int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset); @@ -69,7 +69,7 @@ batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, struct batadv_orig_ifinfo * batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, struct batadv_hard_iface *if_outgoing); -void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo); +void batadv_orig_ifinfo_put(struct batadv_orig_ifinfo *orig_ifinfo); int batadv_orig_seq_print_text(struct seq_file *seq, void *offset); int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset); @@ -83,7 +83,7 @@ batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, struct batadv_orig_node_vlan * batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, unsigned short vid); -void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan); +void batadv_orig_node_vlan_put(struct batadv_orig_node_vlan *orig_vlan); /* hashfunction to choose an entry in a hash table of given size * hash algorithm from http://en.wikipedia.org/wiki/Hash_table @@ -115,7 +115,7 @@ batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) if (!batadv_compare_eth(orig_node, data)) continue; - if (!atomic_inc_not_zero(&orig_node->refcount)) + if (!kref_get_unless_zero(&orig_node->refcount)) continue; orig_node_tmp = orig_node; diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index 0558e3237e0e..8a8d7ca1a5cf 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -26,6 +26,8 @@ * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV * @BATADV_BCAST: broadcast packets carrying broadcast payload * @BATADV_CODED: network coded packets + * @BATADV_ELP: echo location packets for B.A.T.M.A.N. V + * @BATADV_OGM2: originator messages for B.A.T.M.A.N. V * * @BATADV_UNICAST: unicast packets carrying unicast payload traffic * @BATADV_UNICAST_FRAG: unicast packets carrying a fragment of the original @@ -40,6 +42,8 @@ enum batadv_packettype { BATADV_IV_OGM = 0x00, BATADV_BCAST = 0x01, BATADV_CODED = 0x02, + BATADV_ELP = 0x03, + BATADV_OGM2 = 0x04, /* 0x40 - 0x7f: unicast */ #define BATADV_UNICAST_MIN 0x40 BATADV_UNICAST = 0x40, @@ -158,7 +162,7 @@ enum batadv_tt_client_flags { }; /** - * batadv_vlan_flags - flags for the four MSB of any vlan ID field + * enum batadv_vlan_flags - flags for the four MSB of any vlan ID field * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not */ enum batadv_vlan_flags { @@ -209,6 +213,11 @@ struct batadv_bla_claim_dst { * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header * @flags: contains routing relevant flags - see enum batadv_iv_flags + * @seqno: sequence identification + * @orig: address of the source node + * @prev_sender: address of the previous sender + * @reserved: reserved byte for alignment + * @tq: transmission quality * @tvlv_len: length of tvlv data following the ogm header */ struct batadv_ogm_packet { @@ -230,7 +239,52 @@ struct batadv_ogm_packet { #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet) /** - * batadv_icmp_header - common members among all the ICMP packets + * struct batadv_ogm2_packet - ogm2 (routing protocol) packet + * @packet_type: batman-adv packet type, part of the general header + * @version: batman-adv protocol version, part of the general header + * @ttl: time to live for this packet, part of the general header + * @flags: reseved for routing relevant flags - currently always 0 + * @seqno: sequence number + * @orig: originator mac address + * @tvlv_len: length of the appended tvlv buffer (in bytes) + * @throughput: the currently flooded path throughput + */ +struct batadv_ogm2_packet { + u8 packet_type; + u8 version; + u8 ttl; + u8 flags; + __be32 seqno; + u8 orig[ETH_ALEN]; + __be16 tvlv_len; + __be32 throughput; + /* __packed is not needed as the struct size is divisible by 4, + * and the largest data type in this struct has a size of 4. + */ +}; + +#define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_packet) + +/** + * struct batadv_elp_packet - elp (neighbor discovery) packet + * @packet_type: batman-adv packet type, part of the general header + * @version: batman-adv protocol version, part of the genereal header + * @orig: originator mac address + * @seqno: sequence number + * @elp_interval: currently used ELP sending interval in ms + */ +struct batadv_elp_packet { + u8 packet_type; + u8 version; + u8 orig[ETH_ALEN]; + __be32 seqno; + __be32 elp_interval; +}; + +#define BATADV_ELP_HLEN sizeof(struct batadv_elp_packet) + +/** + * struct batadv_icmp_header - common members among all the ICMP packets * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header @@ -256,7 +310,7 @@ struct batadv_icmp_header { }; /** - * batadv_icmp_packet - ICMP packet + * struct batadv_icmp_packet - ICMP packet * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header @@ -282,7 +336,7 @@ struct batadv_icmp_packet { #define BATADV_RR_LEN 16 /** - * batadv_icmp_packet_rr - ICMP RouteRecord packet + * struct batadv_icmp_packet_rr - ICMP RouteRecord packet * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header @@ -345,6 +399,7 @@ struct batadv_unicast_packet { * @u: common unicast packet header * @src: address of the source * @subtype: packet subtype + * @reserved: reserved byte for alignment */ struct batadv_unicast_4addr_packet { struct batadv_unicast_packet u; @@ -413,7 +468,6 @@ struct batadv_bcast_packet { * @packet_type: batman-adv packet type, part of the general header * @version: batman-adv protocol version, part of the genereal header * @ttl: time to live for this packet, part of the genereal header - * @reserved: Align following fields to 2-byte boundaries * @first_source: original source of first included packet * @first_orig_dest: original destinal of first included packet * @first_crc: checksum of first included packet @@ -495,7 +549,7 @@ struct batadv_tvlv_gateway_data { * struct batadv_tvlv_tt_data - tt data propagated through the tt tvlv container * @flags: translation table flags (see batadv_tt_data_flags) * @ttvn: translation table version number - * @vlan_num: number of announced VLANs. In the TVLV this struct is followed by + * @num_vlan: number of announced VLANs. In the TVLV this struct is followed by * one batadv_tvlv_tt_vlan_data object per announced vlan */ struct batadv_tvlv_tt_data { diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index e4f2646d9246..b781bf753250 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -25,6 +25,7 @@ #include <linux/etherdevice.h> #include <linux/if_ether.h> #include <linux/jiffies.h> +#include <linux/kref.h> #include <linux/netdevice.h> #include <linux/printk.h> #include <linux/rculist.h> @@ -72,7 +73,7 @@ static void _batadv_update_route(struct batadv_priv *bat_priv, rcu_read_lock(); curr_router = rcu_dereference(orig_ifinfo->router); - if (curr_router && !atomic_inc_not_zero(&curr_router->refcount)) + if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) curr_router = NULL; rcu_read_unlock(); @@ -97,20 +98,29 @@ static void _batadv_update_route(struct batadv_priv *bat_priv, } if (curr_router) - batadv_neigh_node_free_ref(curr_router); + batadv_neigh_node_put(curr_router); /* increase refcount of new best neighbor */ - if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) + if (neigh_node && !kref_get_unless_zero(&neigh_node->refcount)) neigh_node = NULL; spin_lock_bh(&orig_node->neigh_list_lock); + /* curr_router used earlier may not be the current orig_ifinfo->router + * anymore because it was dereferenced outside of the neigh_list_lock + * protected region. After the new best neighbor has replace the current + * best neighbor the reference counter needs to decrease. Consequently, + * the code needs to ensure the curr_router variable contains a pointer + * to the replaced best neighbor. + */ + curr_router = rcu_dereference_protected(orig_ifinfo->router, true); + rcu_assign_pointer(orig_ifinfo->router, neigh_node); spin_unlock_bh(&orig_node->neigh_list_lock); - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_put(orig_ifinfo); /* decrease refcount of previous best neighbor */ if (curr_router) - batadv_neigh_node_free_ref(curr_router); + batadv_neigh_node_put(curr_router); } /** @@ -137,24 +147,38 @@ void batadv_update_route(struct batadv_priv *bat_priv, out: if (router) - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); } -/* checks whether the host restarted and is in the protection time. - * returns: - * 0 if the packet is to be accepted +/** + * batadv_window_protected - checks whether the host restarted and is in the + * protection time. + * @bat_priv: the bat priv with all the soft interface information + * @seq_num_diff: difference between the current/received sequence number and + * the last sequence number + * @seq_old_max_diff: maximum age of sequence number not considered as restart + * @last_reset: jiffies timestamp of the last reset, will be updated when reset + * is detected + * @protection_started: is set to true if the protection window was started, + * doesn't change otherwise. + * + * Return: + * 0 if the packet is to be accepted. * 1 if the packet is to be ignored. */ int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, - unsigned long *last_reset) + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started) { - if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || + if (seq_num_diff <= -seq_old_max_diff || seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { if (!batadv_has_timed_out(*last_reset, BATADV_RESET_PROTECTION_MS)) return 1; *last_reset = jiffies; + if (protection_started) + *protection_started = true; batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "old packet received, start protection\n"); } @@ -198,7 +222,7 @@ bool batadv_check_management_packet(struct sk_buff *skb, * @bat_priv: the bat priv with all the soft interface information * @skb: icmp packet to process * - * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP * otherwise. */ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, @@ -254,9 +278,9 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } @@ -302,9 +326,9 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } @@ -388,7 +412,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } @@ -398,10 +422,11 @@ out: * @skb: packet to check * @hdr_size: size of header to pull * - * Check for short header and bad addresses in given packet. Returns negative - * value when check fails and 0 otherwise. The negative value depends on the - * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, - * and -EREMOTE for non-local (other host) destination. + * Check for short header and bad addresses in given packet. + * + * Return: negative value when check fails and 0 otherwise. The negative value + * depends on the reason: -ENODATA for bad header, -EBADR for broadcast + * destination or source, and -EREMOTE for non-local (other host) destination. */ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, int hdr_size) @@ -435,7 +460,7 @@ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, * @orig_node: the destination node * @recv_if: pointer to interface this packet was received on * - * Returns the router which should be used for this orig_node on + * Return: the router which should be used for this orig_node on * this interface, or NULL if not available. */ struct batadv_neigh_node * @@ -482,14 +507,14 @@ batadv_find_router(struct batadv_priv *bat_priv, hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { /* acquire some structures and references ... */ - if (!atomic_inc_not_zero(&cand->refcount)) + if (!kref_get_unless_zero(&cand->refcount)) continue; cand_router = rcu_dereference(cand->router); if (!cand_router) goto next; - if (!atomic_inc_not_zero(&cand_router->refcount)) { + if (!kref_get_unless_zero(&cand_router->refcount)) { cand_router = NULL; goto next; } @@ -508,8 +533,8 @@ batadv_find_router(struct batadv_priv *bat_priv, /* mark the first possible candidate */ if (!first_candidate) { - atomic_inc(&cand_router->refcount); - atomic_inc(&cand->refcount); + kref_get(&cand_router->refcount); + kref_get(&cand->refcount); first_candidate = cand; first_candidate_router = cand_router; } @@ -529,16 +554,16 @@ batadv_find_router(struct batadv_priv *bat_priv, next: /* free references */ if (cand_router) { - batadv_neigh_node_free_ref(cand_router); + batadv_neigh_node_put(cand_router); cand_router = NULL; } - batadv_orig_ifinfo_free_ref(cand); + batadv_orig_ifinfo_put(cand); } rcu_read_unlock(); /* last_bonding_candidate is reset below, remove the old reference. */ if (orig_node->last_bonding_candidate) - batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); + batadv_orig_ifinfo_put(orig_node->last_bonding_candidate); /* After finding candidates, handle the three cases: * 1) there is a next candidate, use that @@ -546,17 +571,17 @@ next: * 3) there is no candidate at all, return the default router */ if (next_candidate) { - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); /* remove references to first candidate, we don't need it. */ if (first_candidate) { - batadv_neigh_node_free_ref(first_candidate_router); - batadv_orig_ifinfo_free_ref(first_candidate); + batadv_neigh_node_put(first_candidate_router); + batadv_orig_ifinfo_put(first_candidate); } router = next_candidate_router; orig_node->last_bonding_candidate = next_candidate; } else if (first_candidate) { - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); /* refcounting has already been done in the loop above. */ router = first_candidate_router; @@ -633,7 +658,7 @@ static int batadv_route_unicast_packet(struct sk_buff *skb, out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } @@ -648,7 +673,7 @@ out: * the new corresponding information (originator address where the destination * client currently is and its known TTVN) * - * Returns true if the packet header has been updated, false otherwise + * Return: true if the packet header has been updated, false otherwise */ static bool batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, @@ -686,9 +711,9 @@ batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, ret = true; out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } @@ -752,7 +777,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, return 0; curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } /* check if the TTVN contained in the packet is fresher than what the @@ -792,7 +817,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); unicast_packet->ttvn = curr_ttvn; @@ -805,7 +830,7 @@ static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, * @skb: unicast tvlv packet to process * @recv_if: pointer to interface this packet was received on * - * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP * otherwise. */ int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, @@ -892,7 +917,7 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, rx_success: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return NET_RX_SUCCESS; } @@ -904,9 +929,8 @@ rx_success: * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets * @skb: unicast tvlv packet to process * @recv_if: pointer to interface this packet was received on - * @dst_addr: the payload destination * - * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP + * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP * otherwise. */ int batadv_recv_unicast_tvlv(struct sk_buff *skb, @@ -960,7 +984,7 @@ int batadv_recv_unicast_tvlv(struct sk_buff *skb, * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till * lack further fragments; 3) Merge fragments, if we have all needed parts. * - * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. + * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. */ int batadv_recv_frag_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if) @@ -1004,7 +1028,7 @@ int batadv_recv_frag_packet(struct sk_buff *skb, out: if (orig_node_src) - batadv_orig_node_free_ref(orig_node_src); + batadv_orig_node_put(orig_node_src); return ret; } @@ -1065,7 +1089,8 @@ int batadv_recv_bcast_packet(struct sk_buff *skb, /* check whether the packet is old and the host just restarted. */ if (batadv_window_protected(bat_priv, seq_diff, - &orig_node->bcast_seqno_reset)) + BATADV_BCAST_MAX_AGE, + &orig_node->bcast_seqno_reset, NULL)) goto spin_unlock; /* mark broadcast in flood history, update window position @@ -1108,6 +1133,6 @@ spin_unlock: spin_unlock_bh(&orig_node->bcast_seqno_lock); out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return ret; } diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h index 204bbe4952a6..02a5caa84127 100644 --- a/net/batman-adv/routing.h +++ b/net/batman-adv/routing.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -52,6 +52,7 @@ batadv_find_router(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if); int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, - unsigned long *last_reset); + s32 seq_old_max_diff, unsigned long *last_reset, + bool *protection_started); #endif /* _NET_BATMAN_ADV_ROUTING_H_ */ diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index 782fa33ec296..76417850d3fc 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -49,16 +49,30 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work); -/* send out an already prepared packet to the given address via the - * specified batman interface +/** + * batadv_send_skb_packet - send an already prepared packet + * @skb: the packet to send + * @hard_iface: the interface to use to send the broadcast packet + * @dst_addr: the payload destination + * + * Send out an already prepared packet to the given neighbor or broadcast it + * using the specified interface. Either hard_iface or neigh_node must be not + * NULL. + * If neigh_node is NULL, then the packet is broadcasted using hard_iface, + * otherwise it is sent as unicast to the given neighbor. + * + * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb) + * otherwise */ int batadv_send_skb_packet(struct sk_buff *skb, struct batadv_hard_iface *hard_iface, const u8 *dst_addr) { - struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct batadv_priv *bat_priv; struct ethhdr *ethhdr; + bat_priv = netdev_priv(hard_iface->soft_iface); + if (hard_iface->if_status != BATADV_IF_ACTIVE) goto send_skb_err; @@ -100,6 +114,35 @@ send_skb_err: return NET_XMIT_DROP; } +int batadv_send_broadcast_skb(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface) +{ + return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); +} + +int batadv_send_unicast_skb(struct sk_buff *skb, + struct batadv_neigh_node *neigh) +{ +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_hardif_neigh_node *hardif_neigh; +#endif + int ret; + + ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr); + +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr); + + if ((hardif_neigh) && (ret != NET_XMIT_DROP)) + hardif_neigh->bat_v.last_unicast_tx = jiffies; + + if (hardif_neigh) + batadv_hardif_neigh_put(hardif_neigh); +#endif + + return ret; +} + /** * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. * @skb: Packet to be transmitted. @@ -111,7 +154,7 @@ send_skb_err: * host, NULL can be passed as recv_if and no interface alternating is * attempted. * - * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or + * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or * NET_XMIT_POLICED if the skb is buffered for later transmit. */ int batadv_send_skb_to_orig(struct sk_buff *skb, @@ -146,14 +189,13 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { ret = NET_XMIT_POLICED; } else { - batadv_send_skb_packet(skb, neigh_node->if_incoming, - neigh_node->addr); + batadv_send_unicast_skb(skb, neigh_node); ret = NET_XMIT_SUCCESS; } out: if (neigh_node) - batadv_neigh_node_free_ref(neigh_node); + batadv_neigh_node_put(neigh_node); return ret; } @@ -165,7 +207,7 @@ out: * @hdr_size: amount of bytes to push at the beginning of the skb * @orig_node: the destination node * - * Returns false if the buffer extension was not possible or true otherwise. + * Return: false if the buffer extension was not possible or true otherwise. */ static bool batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, @@ -196,7 +238,7 @@ batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, * @skb: the skb containing the payload to encapsulate * @orig_node: the destination node * - * Returns false if the payload could not be encapsulated or true otherwise. + * Return: false if the payload could not be encapsulated or true otherwise. */ static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, struct batadv_orig_node *orig_node) @@ -211,10 +253,10 @@ static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, * unicast 4addr header * @bat_priv: the bat priv with all the soft interface information * @skb: the skb containing the payload to encapsulate - * @orig_node: the destination node + * @orig: the destination node * @packet_subtype: the unicast 4addr packet subtype to use * - * Returns false if the payload could not be encapsulated or true otherwise. + * Return: false if the payload could not be encapsulated or true otherwise. */ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, struct sk_buff *skb, @@ -246,7 +288,7 @@ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, ret = true; out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return ret; } @@ -265,7 +307,7 @@ out: * as packet_type. Then send this frame to the given orig_node and release a * reference to this orig_node. * - * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_unicast(struct batadv_priv *bat_priv, struct sk_buff *skb, int packet_type, @@ -317,7 +359,7 @@ int batadv_send_skb_unicast(struct batadv_priv *bat_priv, out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); if (ret == NET_XMIT_DROP) kfree_skb(skb); return ret; @@ -339,7 +381,7 @@ out: * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame * to the according destination node. * - * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, struct sk_buff *skb, int packet_type, @@ -373,7 +415,7 @@ int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, * Look up the currently selected gateway. Wrap the given skb into a batman-adv * unicast header and send this frame to this gateway node. * - * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, unsigned short vid) @@ -409,9 +451,9 @@ static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) { kfree_skb(forw_packet->skb); if (forw_packet->if_incoming) - batadv_hardif_free_ref(forw_packet->if_incoming); + batadv_hardif_put(forw_packet->if_incoming); if (forw_packet->if_outgoing) - batadv_hardif_free_ref(forw_packet->if_outgoing); + batadv_hardif_put(forw_packet->if_outgoing); kfree(forw_packet); } @@ -430,14 +472,19 @@ _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, send_time); } -/* add a broadcast packet to the queue and setup timers. broadcast packets - * are sent multiple times to increase probability for being received. +/** + * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends + * @bat_priv: the bat priv with all the soft interface information + * @skb: broadcast packet to add + * @delay: number of jiffies to wait before sending * - * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on - * errors. + * add a broadcast packet to the queue and setup timers. broadcast packets + * are sent multiple times to increase probability for being received. * * The skb is not consumed, so the caller should make sure that the * skb is freed. + * + * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors. */ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, const struct sk_buff *skb, @@ -492,7 +539,7 @@ out_and_inc: atomic_inc(&bat_priv->bcast_queue_left); out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return NETDEV_TX_BUSY; } @@ -533,8 +580,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work) /* send a copy of the saved skb */ skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); if (skb1) - batadv_send_skb_packet(skb1, hard_iface, - batadv_broadcast_addr); + batadv_send_broadcast_skb(skb1, hard_iface); } rcu_read_unlock(); @@ -629,6 +675,9 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, if (pending) { hlist_del(&forw_packet->list); + if (!forw_packet->own) + atomic_inc(&bat_priv->bcast_queue_left); + batadv_forw_packet_free(forw_packet); } } @@ -656,6 +705,9 @@ batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, if (pending) { hlist_del(&forw_packet->list); + if (!forw_packet->own) + atomic_inc(&bat_priv->batman_queue_left); + batadv_forw_packet_free(forw_packet); } } diff --git a/net/batman-adv/send.h b/net/batman-adv/send.h index 82059f259e46..6fd7270d8ce6 100644 --- a/net/batman-adv/send.h +++ b/net/batman-adv/send.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -28,12 +28,16 @@ struct sk_buff; struct work_struct; -int batadv_send_skb_packet(struct sk_buff *skb, - struct batadv_hard_iface *hard_iface, - const u8 *dst_addr); int batadv_send_skb_to_orig(struct sk_buff *skb, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if); +int batadv_send_skb_packet(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface, + const u8 *dst_addr); +int batadv_send_broadcast_skb(struct sk_buff *skb, + struct batadv_hard_iface *hard_iface); +int batadv_send_unicast_skb(struct sk_buff *skb, + struct batadv_neigh_node *neigh_node); void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface); int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, const struct sk_buff *skb, @@ -69,7 +73,7 @@ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, * header via the translation table. Wrap the given skb into a batman-adv * unicast header. Then send this frame to the according destination node. * - * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ static inline int batadv_send_skb_via_tt(struct batadv_priv *bat_priv, struct sk_buff *skb, u8 *dst_hint, @@ -92,7 +96,7 @@ static inline int batadv_send_skb_via_tt(struct batadv_priv *bat_priv, * unicast-4addr header. Then send this frame to the according destination * node. * - * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. + * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ static inline int batadv_send_skb_via_tt_4addr(struct batadv_priv *bat_priv, struct sk_buff *skb, diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index ac4d08de5df4..8a136b6a1ff0 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -30,6 +30,7 @@ #include <linux/if_vlan.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -376,7 +377,7 @@ dropped_freed: batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); end: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return NETDEV_TX_OK; } @@ -407,11 +408,17 @@ void batadv_interface_rx(struct net_device *soft_iface, */ nf_reset(skb); + if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) + goto dropped; + vid = batadv_get_vid(skb, 0); ethhdr = eth_hdr(skb); switch (ntohs(ethhdr->h_proto)) { case ETH_P_8021Q: + if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) + goto dropped; + vhdr = (struct vlan_ethhdr *)skb->data; if (vhdr->h_vlan_encapsulated_proto != ethertype) @@ -423,8 +430,6 @@ void batadv_interface_rx(struct net_device *soft_iface, } /* skb->dev & skb->pkt_type are set here */ - if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) - goto dropped; skb->protocol = eth_type_trans(skb, soft_iface); /* should not be necessary anymore as we use skb_pull_rcsum() @@ -478,22 +483,34 @@ out: } /** - * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and - * possibly free it - * @softif_vlan: the vlan object to release + * batadv_softif_vlan_release - release vlan from lists and queue for free after + * rcu grace period + * @ref: kref pointer of the vlan object + */ +static void batadv_softif_vlan_release(struct kref *ref) +{ + struct batadv_softif_vlan *vlan; + + vlan = container_of(ref, struct batadv_softif_vlan, refcount); + + spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); + hlist_del_rcu(&vlan->list); + spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); + + kfree_rcu(vlan, rcu); +} + +/** + * batadv_softif_vlan_put - decrease the vlan object refcounter and + * possibly release it + * @vlan: the vlan object to release */ -void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) +void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) { if (!vlan) return; - if (atomic_dec_and_test(&vlan->refcount)) { - spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); - hlist_del_rcu(&vlan->list); - spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); - - kfree_rcu(vlan, rcu); - } + kref_put(&vlan->refcount, batadv_softif_vlan_release); } /** @@ -501,7 +518,7 @@ void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) * @bat_priv: the bat priv with all the soft interface information * @vid: the identifier of the vlan object to retrieve * - * Returns the private data of the vlan matching the vid passed as argument or + * Return: the private data of the vlan matching the vid passed as argument or * NULL otherwise. The refcounter of the returned object is incremented by 1. */ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, @@ -514,7 +531,7 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, if (vlan_tmp->vid != vid) continue; - if (!atomic_inc_not_zero(&vlan_tmp->refcount)) + if (!kref_get_unless_zero(&vlan_tmp->refcount)) continue; vlan = vlan_tmp; @@ -530,7 +547,7 @@ struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, * @bat_priv: the bat priv with all the soft interface information * @vid: the VLAN identifier * - * Returns 0 on success, a negative error otherwise. + * Return: 0 on success, a negative error otherwise. */ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) { @@ -539,7 +556,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) vlan = batadv_softif_vlan_get(bat_priv, vid); if (vlan) { - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); return -EEXIST; } @@ -549,7 +566,7 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) vlan->bat_priv = bat_priv; vlan->vid = vid; - atomic_set(&vlan->refcount, 1); + kref_init(&vlan->refcount); atomic_set(&vlan->ap_isolation, 0); @@ -588,18 +605,19 @@ static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, vlan->vid, "vlan interface destroyed", false); batadv_sysfs_del_vlan(bat_priv, vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); } /** * batadv_interface_add_vid - ndo_add_vid API implementation * @dev: the netdev of the mesh interface + * @proto: protocol of the the vlan id * @vid: identifier of the new vlan * * Set up all the internal structures for handling the new vlan on top of the * mesh interface * - * Returns 0 on success or a negative error code in case of failure. + * Return: 0 on success or a negative error code in case of failure. */ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, unsigned short vid) @@ -632,7 +650,7 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, if (!vlan->kobj) { ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); if (ret) { - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); return ret; } } @@ -651,12 +669,13 @@ static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, /** * batadv_interface_kill_vid - ndo_kill_vid API implementation * @dev: the netdev of the mesh interface + * @proto: protocol of the the vlan id * @vid: identifier of the deleted vlan * * Destroy all the internal structures used to handle the vlan identified by vid * on top of the mesh interface * - * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q + * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q * or -ENOENT if the specified vlan id wasn't registered. */ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, @@ -678,7 +697,7 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, batadv_softif_destroy_vlan(bat_priv, vlan); /* finally free the vlan object */ - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); return 0; } @@ -734,7 +753,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work) vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); if (vlan) { batadv_softif_destroy_vlan(bat_priv, vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); } batadv_sysfs_del_meshif(soft_iface); @@ -745,7 +764,7 @@ static void batadv_softif_destroy_finish(struct work_struct *work) * batadv_softif_init_late - late stage initialization of soft interface * @dev: registered network device to modify * - * Returns error code on failures + * Return: error code on failures */ static int batadv_softif_init_late(struct net_device *dev) { @@ -847,7 +866,7 @@ free_bat_counters: * @dev: batadv_soft_interface used as master interface * @slave_dev: net_device which should become the slave interface * - * Return 0 if successful or error otherwise. + * Return: 0 if successful or error otherwise. */ static int batadv_softif_slave_add(struct net_device *dev, struct net_device *slave_dev) @@ -863,7 +882,7 @@ static int batadv_softif_slave_add(struct net_device *dev, out: if (hard_iface) - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } @@ -872,7 +891,7 @@ out: * @dev: batadv_soft_interface used as master interface * @slave_dev: net_device which should be removed from the master interface * - * Return 0 if successful or error otherwise. + * Return: 0 if successful or error otherwise. */ static int batadv_softif_slave_del(struct net_device *dev, struct net_device *slave_dev) @@ -890,7 +909,7 @@ static int batadv_softif_slave_del(struct net_device *dev, out: if (hard_iface) - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } diff --git a/net/batman-adv/soft-interface.h b/net/batman-adv/soft-interface.h index 8e82176f40b1..9ae265703d23 100644 --- a/net/batman-adv/soft-interface.h +++ b/net/batman-adv/soft-interface.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -34,7 +34,7 @@ void batadv_softif_destroy_sysfs(struct net_device *soft_iface); int batadv_softif_is_valid(const struct net_device *net_dev); extern struct rtnl_link_ops batadv_link_ops; int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid); -void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *softif_vlan); +void batadv_softif_vlan_put(struct batadv_softif_vlan *softif_vlan); struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, unsigned short vid); diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index fe87777fda8a..e7cf51333a36 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2010-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * @@ -25,6 +25,7 @@ #include <linux/fs.h> #include <linux/if.h> #include <linux/if_vlan.h> +#include <linux/kref.h> #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/printk.h> @@ -64,7 +65,7 @@ static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj) * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv * @obj: kobject to covert * - * Returns the associated batadv_priv struct. + * Return: the associated batadv_priv struct. */ static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj) { @@ -82,9 +83,10 @@ static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj) /** * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct + * @bat_priv: the bat priv with all the soft interface information * @obj: kobject to covert * - * Returns the associated softif_vlan struct if found, NULL otherwise. + * Return: the associated softif_vlan struct if found, NULL otherwise. */ static struct batadv_softif_vlan * batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj) @@ -96,7 +98,7 @@ batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj) if (vlan_tmp->kobj != obj) continue; - if (!atomic_inc_not_zero(&vlan_tmp->refcount)) + if (!kref_get_unless_zero(&vlan_tmp->refcount)) continue; vlan = vlan_tmp; @@ -214,7 +216,7 @@ ssize_t batadv_store_vlan_##_name(struct kobject *kobj, \ attr, &vlan->_name, \ bat_priv->soft_iface); \ \ - batadv_softif_vlan_free_ref(vlan); \ + batadv_softif_vlan_put(vlan); \ return res; \ } @@ -229,7 +231,7 @@ ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \ atomic_read(&vlan->_name) == 0 ? \ "disabled" : "enabled"); \ \ - batadv_softif_vlan_free_ref(vlan); \ + batadv_softif_vlan_put(vlan); \ return res; \ } @@ -240,6 +242,55 @@ ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \ static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \ batadv_store_vlan_##_name) +#define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \ +ssize_t batadv_store_##_name(struct kobject *kobj, \ + struct attribute *attr, char *buff, \ + size_t count) \ +{ \ + struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \ + struct batadv_hard_iface *hard_iface; \ + ssize_t length; \ + \ + hard_iface = batadv_hardif_get_by_netdev(net_dev); \ + if (!hard_iface) \ + return 0; \ + \ + length = __batadv_store_uint_attr(buff, count, _min, _max, \ + _post_func, attr, \ + &hard_iface->_var, net_dev); \ + \ + batadv_hardif_put(hard_iface); \ + return length; \ +} + +#define BATADV_ATTR_HIF_SHOW_UINT(_name, _var) \ +ssize_t batadv_show_##_name(struct kobject *kobj, \ + struct attribute *attr, char *buff) \ +{ \ + struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \ + struct batadv_hard_iface *hard_iface; \ + ssize_t length; \ + \ + hard_iface = batadv_hardif_get_by_netdev(net_dev); \ + if (!hard_iface) \ + return 0; \ + \ + length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \ + \ + batadv_hardif_put(hard_iface); \ + return length; \ +} + +/* Use this, if you are going to set [name] in hard_iface to an + * unsigned integer value + */ +#define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\ + static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, \ + _max, _post_func) \ + static BATADV_ATTR_HIF_SHOW_UINT(_name, _var) \ + static BATADV_ATTR(_name, _mode, batadv_show_##_name, \ + batadv_store_##_name) + static int batadv_store_bool_attr(char *buff, size_t count, struct net_device *net_dev, const char *attr_name, atomic_t *attr, @@ -491,7 +542,7 @@ static ssize_t batadv_store_gw_bwidth(struct kobject *kobj, * @attr: the batman-adv attribute the user is interacting with * @buff: the buffer that will contain the data to send back to the user * - * Returns the number of bytes written into 'buff' on success or a negative + * Return: the number of bytes written into 'buff' on success or a negative * error code in case of failure */ static ssize_t batadv_show_isolation_mark(struct kobject *kobj, @@ -511,7 +562,7 @@ static ssize_t batadv_show_isolation_mark(struct kobject *kobj, * @buff: the buffer containing the user data * @count: number of bytes in the buffer * - * Returns 'count' on success or a negative error code in case of failure + * Return: 'count' on success or a negative error code in case of failure */ static ssize_t batadv_store_isolation_mark(struct kobject *kobj, struct attribute *attr, char *buff, @@ -620,9 +671,7 @@ static struct batadv_attribute *batadv_mesh_attrs[] = { BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL); -/** - * batadv_vlan_attrs - array of vlan specific sysfs attributes - */ +/* array of vlan specific sysfs attributes */ static struct batadv_attribute *batadv_vlan_attrs[] = { &batadv_attr_vlan_ap_isolation, NULL, @@ -683,7 +732,7 @@ void batadv_sysfs_del_meshif(struct net_device *dev) * @dev: netdev of the mesh interface * @vlan: private data of the newly added VLAN interface * - * Returns 0 on success and -ENOMEM if any of the structure allocations fails. + * Return: 0 on success and -ENOMEM if any of the structure allocations fails. */ int batadv_sysfs_add_vlan(struct net_device *dev, struct batadv_softif_vlan *vlan) @@ -771,7 +820,7 @@ static ssize_t batadv_show_mesh_iface(struct kobject *kobj, length = sprintf(buff, "%s\n", ifname); - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return length; } @@ -795,7 +844,7 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj, if (strlen(buff) >= IFNAMSIZ) { pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n", buff); - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return -EINVAL; } @@ -829,7 +878,7 @@ static ssize_t batadv_store_mesh_iface(struct kobject *kobj, unlock: rtnl_unlock(); out: - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return ret; } @@ -863,18 +912,99 @@ static ssize_t batadv_show_iface_status(struct kobject *kobj, break; } - batadv_hardif_free_ref(hard_iface); + batadv_hardif_put(hard_iface); return length; } +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + +/** + * batadv_store_throughput_override - parse and store throughput override + * entered by the user + * @kobj: kobject representing the private mesh sysfs directory + * @attr: the batman-adv attribute the user is interacting with + * @buff: the buffer containing the user data + * @count: number of bytes in the buffer + * + * Return: 'count' on success or a negative error code in case of failure + */ +static ssize_t batadv_store_throughput_override(struct kobject *kobj, + struct attribute *attr, + char *buff, size_t count) +{ + struct net_device *net_dev = batadv_kobj_to_netdev(kobj); + struct batadv_hard_iface *hard_iface; + u32 tp_override; + u32 old_tp_override; + bool ret; + + hard_iface = batadv_hardif_get_by_netdev(net_dev); + if (!hard_iface) + return -EINVAL; + + if (buff[count - 1] == '\n') + buff[count - 1] = '\0'; + + ret = batadv_parse_throughput(net_dev, buff, "throughput_override", + &tp_override); + if (!ret) + return count; + + old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override); + if (old_tp_override == tp_override) + goto out; + + batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n", + "throughput_override", + old_tp_override / 10, old_tp_override % 10, + tp_override / 10, tp_override % 10); + + atomic_set(&hard_iface->bat_v.throughput_override, tp_override); + +out: + batadv_hardif_put(hard_iface); + return count; +} + +static ssize_t batadv_show_throughput_override(struct kobject *kobj, + struct attribute *attr, + char *buff) +{ + struct net_device *net_dev = batadv_kobj_to_netdev(kobj); + struct batadv_hard_iface *hard_iface; + u32 tp_override; + + hard_iface = batadv_hardif_get_by_netdev(net_dev); + if (!hard_iface) + return -EINVAL; + + tp_override = atomic_read(&hard_iface->bat_v.throughput_override); + + return sprintf(buff, "%u.%u MBit\n", tp_override / 10, + tp_override % 10); +} + +#endif + static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface, batadv_store_mesh_iface); static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL); +#ifdef CONFIG_BATMAN_ADV_BATMAN_V +BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR, + 2 * BATADV_JITTER, INT_MAX, NULL); +static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR, + batadv_show_throughput_override, + batadv_store_throughput_override); +#endif static struct batadv_attribute *batadv_batman_attrs[] = { &batadv_attr_mesh_iface, &batadv_attr_iface_status, +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + &batadv_attr_elp_interval, + &batadv_attr_throughput_override, +#endif NULL, }; diff --git a/net/batman-adv/sysfs.h b/net/batman-adv/sysfs.h index 61974428a7af..c76021b4e198 100644 --- a/net/batman-adv/sysfs.h +++ b/net/batman-adv/sysfs.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2010-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2010-2016 B.A.T.M.A.N. contributors: * * Marek Lindner * diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index cdfc85fa2743..9b4551a86535 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich, Antonio Quartulli * @@ -31,6 +31,7 @@ #include <linux/jhash.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/netdevice.h> @@ -68,7 +69,15 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv, unsigned short vid, const char *message, bool roaming); -/* returns 1 if they are the same mac addr and vid */ +/** + * batadv_compare_tt - check if two TT entries are the same + * @node: the list element pointer of the first TT entry + * @data2: pointer to the tt_common_entry of the second TT entry + * + * Compare the MAC address and the VLAN ID of the two TT entries and check if + * they are the same TT client. + * Return: 1 if the two TT clients are the same, 0 otherwise + */ static int batadv_compare_tt(const struct hlist_node *node, const void *data2) { const void *data1 = container_of(node, struct batadv_tt_common_entry, @@ -84,7 +93,7 @@ static int batadv_compare_tt(const struct hlist_node *node, const void *data2) * @data: pointer to the tt_common_entry object to map * @size: the size of the hash table * - * Returns the hash index where the object represented by 'data' should be + * Return: the hash index where the object represented by 'data' should be * stored at. */ static inline u32 batadv_choose_tt(const void *data, u32 size) @@ -105,7 +114,7 @@ static inline u32 batadv_choose_tt(const void *data, u32 size) * @addr: the mac address of the client to look for * @vid: VLAN identifier * - * Returns a pointer to the tt_common struct belonging to the searched client if + * Return: a pointer to the tt_common struct belonging to the searched client if * found, NULL otherwise. */ static struct batadv_tt_common_entry * @@ -133,7 +142,7 @@ batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr, if (tt->vid != vid) continue; - if (!atomic_inc_not_zero(&tt->refcount)) + if (!kref_get_unless_zero(&tt->refcount)) continue; tt_tmp = tt; @@ -150,7 +159,7 @@ batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr, * @addr: the mac address of the client to look for * @vid: VLAN identifier * - * Returns a pointer to the corresponding tt_local_entry struct if the client is + * Return: a pointer to the corresponding tt_local_entry struct if the client is * found, NULL otherwise. */ static struct batadv_tt_local_entry * @@ -175,7 +184,7 @@ batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr, * @addr: the mac address of the client to look for * @vid: VLAN identifier * - * Returns a pointer to the corresponding tt_global_entry struct if the client + * Return: a pointer to the corresponding tt_global_entry struct if the client * is found, NULL otherwise. */ static struct batadv_tt_global_entry * @@ -194,34 +203,70 @@ batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr, return tt_global_entry; } +/** + * batadv_tt_local_entry_release - release tt_local_entry from lists and queue + * for free after rcu grace period + * @ref: kref pointer of the nc_node + */ +static void batadv_tt_local_entry_release(struct kref *ref) +{ + struct batadv_tt_local_entry *tt_local_entry; + + tt_local_entry = container_of(ref, struct batadv_tt_local_entry, + common.refcount); + + batadv_softif_vlan_put(tt_local_entry->vlan); + + kfree_rcu(tt_local_entry, common.rcu); +} + +/** + * batadv_tt_local_entry_put - decrement the tt_local_entry refcounter and + * possibly release it + * @tt_local_entry: tt_local_entry to be free'd + */ static void -batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry) +batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry) { - if (atomic_dec_and_test(&tt_local_entry->common.refcount)) - kfree_rcu(tt_local_entry, common.rcu); + kref_put(&tt_local_entry->common.refcount, + batadv_tt_local_entry_release); } /** - * batadv_tt_global_entry_free_ref - decrement the refcounter for a - * tt_global_entry and possibly free it - * @tt_global_entry: the object to free + * batadv_tt_global_entry_release - release tt_global_entry from lists and queue + * for free after rcu grace period + * @ref: kref pointer of the nc_node + */ +static void batadv_tt_global_entry_release(struct kref *ref) +{ + struct batadv_tt_global_entry *tt_global_entry; + + tt_global_entry = container_of(ref, struct batadv_tt_global_entry, + common.refcount); + + batadv_tt_global_del_orig_list(tt_global_entry); + kfree_rcu(tt_global_entry, common.rcu); +} + +/** + * batadv_tt_global_entry_put - decrement the tt_global_entry refcounter and + * possibly release it + * @tt_global_entry: tt_global_entry to be free'd */ static void -batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry) +batadv_tt_global_entry_put(struct batadv_tt_global_entry *tt_global_entry) { - if (atomic_dec_and_test(&tt_global_entry->common.refcount)) { - batadv_tt_global_del_orig_list(tt_global_entry); - kfree_rcu(tt_global_entry, common.rcu); - } + kref_put(&tt_global_entry->common.refcount, + batadv_tt_global_entry_release); } /** * batadv_tt_global_hash_count - count the number of orig entries - * @hash: hash table containing the tt entries + * @bat_priv: the bat priv with all the soft interface information * @addr: the mac address of the client to count entries for * @vid: VLAN identifier * - * Return the number of originators advertising the given address/data + * Return: the number of originators advertising the given address/data * (excluding ourself). */ int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, @@ -235,7 +280,7 @@ int batadv_tt_global_hash_count(struct batadv_priv *bat_priv, return 0; count = atomic_read(&tt_global_entry->orig_list_count); - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); return count; } @@ -258,7 +303,7 @@ static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv, atomic_add(v, &vlan->tt.num_entries); - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); } /** @@ -286,9 +331,9 @@ static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv, } /** - * batadv_tt_global_size_mod - change the size by v of the local table - * identified by vid - * @bat_priv: the bat priv with all the soft interface information + * batadv_tt_global_size_mod - change the size by v of the global table + * for orig_node identified by vid + * @orig_node: the originator for which the table has to be modified * @vid: the VLAN identifier * @v: the amount to sum to the global table size */ @@ -303,12 +348,14 @@ static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node, if (atomic_add_return(v, &vlan->tt.num_entries) == 0) { spin_lock_bh(&orig_node->vlan_list_lock); - hlist_del_init_rcu(&vlan->list); + if (!hlist_unhashed(&vlan->list)) { + hlist_del_init_rcu(&vlan->list); + batadv_orig_node_vlan_put(vlan); + } spin_unlock_bh(&orig_node->vlan_list_lock); - batadv_orig_node_vlan_free_ref(vlan); } - batadv_orig_node_vlan_free_ref(vlan); + batadv_orig_node_vlan_put(vlan); } /** @@ -338,22 +385,28 @@ static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node, /** * batadv_tt_orig_list_entry_release - release tt orig entry from lists and * queue for free after rcu grace period - * @orig_entry: tt orig entry to be free'd + * @ref: kref pointer of the tt orig entry */ -static void -batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry) +static void batadv_tt_orig_list_entry_release(struct kref *ref) { - batadv_orig_node_free_ref(orig_entry->orig_node); + struct batadv_tt_orig_list_entry *orig_entry; + + orig_entry = container_of(ref, struct batadv_tt_orig_list_entry, + refcount); + + batadv_orig_node_put(orig_entry->orig_node); kfree_rcu(orig_entry, rcu); } +/** + * batadv_tt_orig_list_entry_put - decrement the tt orig entry refcounter and + * possibly release it + * @orig_entry: tt orig entry to be free'd + */ static void -batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) +batadv_tt_orig_list_entry_put(struct batadv_tt_orig_list_entry *orig_entry) { - if (!atomic_dec_and_test(&orig_entry->refcount)) - return; - - batadv_tt_orig_list_entry_release(orig_entry); + kref_put(&orig_entry->refcount, batadv_tt_orig_list_entry_release); } /** @@ -435,7 +488,7 @@ unlock: * batadv_tt_len - compute length in bytes of given number of tt changes * @changes_num: number of tt changes * - * Returns computed length in bytes. + * Return: computed length in bytes. */ static int batadv_tt_len(int changes_num) { @@ -446,7 +499,7 @@ static int batadv_tt_len(int changes_num) * batadv_tt_entries - compute the number of entries fitting in tt_len bytes * @tt_len: available space * - * Returns the number of entries. + * Return: the number of entries. */ static u16 batadv_tt_entries(u16 tt_len) { @@ -458,7 +511,7 @@ static u16 batadv_tt_entries(u16 tt_len) * size when transmitted over the air * @bat_priv: the bat priv with all the soft interface information * - * Returns local translation table size in bytes. + * Return: local translation table size in bytes. */ static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) { @@ -510,7 +563,7 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv, batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, batadv_choose_tt, &tt_global->common); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_put(tt_global); } /** @@ -524,7 +577,7 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv, * @mark: the value contained in the skb->mark field of the received packet (if * any) * - * Returns true if the client was successfully added, false otherwise. + * Return: true if the client was successfully added, false otherwise. */ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, unsigned short vid, int ifindex, u32 mark) @@ -618,9 +671,11 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, tt_local->common.vid = vid; if (batadv_is_wifi_netdev(in_dev)) tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; - atomic_set(&tt_local->common.refcount, 2); + kref_init(&tt_local->common.refcount); + kref_get(&tt_local->common.refcount); tt_local->last_seen = jiffies; tt_local->common.added_at = tt_local->last_seen; + tt_local->vlan = vlan; /* the batman interface mac and multicast addresses should never be * purged @@ -635,8 +690,8 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr, if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ - batadv_tt_local_entry_free_ref(tt_local); - batadv_softif_vlan_free_ref(vlan); + batadv_tt_local_entry_put(tt_local); + batadv_softif_vlan_put(vlan); goto out; } @@ -702,9 +757,9 @@ out: if (in_dev) dev_put(in_dev); if (tt_local) - batadv_tt_local_entry_free_ref(tt_local); + batadv_tt_local_entry_put(tt_local); if (tt_global) - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_put(tt_global); return ret; } @@ -719,12 +774,11 @@ out: * function reserves the amount of space needed to send the entire global TT * table. In case of success the value is updated with the real amount of * reserved bytes - * Allocate the needed amount of memory for the entire TT TVLV and write its * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data * objects, one per active VLAN served by the originator node. * - * Return the size of the allocated buffer or 0 in case of failure. + * Return: the size of the allocated buffer or 0 in case of failure. */ static u16 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node, @@ -798,7 +852,7 @@ out: * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data * objects, one per active VLAN. * - * Return the size of the allocated buffer or 0 in case of failure. + * Return: the size of the allocated buffer or 0 in case of failure. */ static u16 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv, @@ -940,7 +994,6 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; struct batadv_hard_iface *primary_if; - struct batadv_softif_vlan *vlan; struct hlist_head *head; unsigned short vid; u32 i; @@ -976,14 +1029,6 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) last_seen_msecs = last_seen_msecs % 1000; no_purge = tt_common_entry->flags & np_flag; - - vlan = batadv_softif_vlan_get(bat_priv, vid); - if (!vlan) { - seq_printf(seq, "Cannot retrieve VLAN %d\n", - BATADV_PRINT_VID(vid)); - continue; - } - seq_printf(seq, " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n", tt_common_entry->addr, @@ -1001,15 +1046,13 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'), no_purge ? 0 : last_seen_secs, no_purge ? 0 : last_seen_msecs, - vlan->tt.crc); - - batadv_softif_vlan_free_ref(vlan); + tt_local->vlan->tt.crc); } rcu_read_unlock(); } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } @@ -1040,7 +1083,7 @@ batadv_tt_local_set_pending(struct batadv_priv *bat_priv, * @message: message to append to the log on deletion * @roaming: true if the deletion is due to a roaming event * - * Returns the flags assigned to the local entry before being deleted + * Return: the flags assigned to the local entry before being deleted */ u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, unsigned short vid, const char *message, @@ -1048,7 +1091,6 @@ u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, { struct batadv_tt_local_entry *tt_local_entry; u16 flags, curr_flags = BATADV_NO_FLAGS; - struct batadv_softif_vlan *vlan; void *tt_entry_exists; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid); @@ -1086,19 +1128,11 @@ u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr, goto out; /* extra call to free the local tt entry */ - batadv_tt_local_entry_free_ref(tt_local_entry); - - /* decrease the reference held for this vlan */ - vlan = batadv_softif_vlan_get(bat_priv, vid); - if (!vlan) - goto out; - - batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); + batadv_tt_local_entry_put(tt_local_entry); out: if (tt_local_entry) - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); return curr_flags; } @@ -1168,7 +1202,6 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) spinlock_t *list_lock; /* protects write access to the hash lists */ struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; - struct batadv_softif_vlan *vlan; struct hlist_node *node_tmp; struct hlist_head *head; u32 i; @@ -1190,15 +1223,7 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) struct batadv_tt_local_entry, common); - /* decrease the reference held for this vlan */ - vlan = batadv_softif_vlan_get(bat_priv, - tt_common_entry->vid); - if (vlan) { - batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); - } - - batadv_tt_local_entry_free_ref(tt_local); + batadv_tt_local_entry_put(tt_local); } spin_unlock_bh(list_lock); } @@ -1240,10 +1265,16 @@ static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) spin_unlock_bh(&bat_priv->tt.changes_list_lock); } -/* retrieves the orig_tt_list_entry belonging to orig_node from the +/** + * batadv_tt_global_orig_entry_find - find a TT orig_list_entry + * @entry: the TT global entry where the orig_list_entry has to be + * extracted from + * @orig_node: the originator for which the orig_list_entry has to be found + * + * retrieve the orig_tt_list_entry belonging to orig_node from the * batadv_tt_global_entry list * - * returns it with an increased refcounter, NULL if not found + * Return: it with an increased refcounter, NULL if not found */ static struct batadv_tt_orig_list_entry * batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, @@ -1257,7 +1288,7 @@ batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, hlist_for_each_entry_rcu(tmp_orig_entry, head, list) { if (tmp_orig_entry->orig_node != orig_node) continue; - if (!atomic_inc_not_zero(&tmp_orig_entry->refcount)) + if (!kref_get_unless_zero(&tmp_orig_entry->refcount)) continue; orig_entry = tmp_orig_entry; @@ -1268,8 +1299,15 @@ batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, return orig_entry; } -/* find out if an orig_node is already in the list of a tt_global_entry. - * returns true if found, false otherwise +/** + * batadv_tt_global_entry_has_orig - check if a TT global entry is also handled + * by a given originator + * @entry: the TT global entry to check + * @orig_node: the originator to search in the list + * + * find out if an orig_node is already in the list of a tt_global_entry. + * + * Return: true if found, false otherwise */ static bool batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, @@ -1281,7 +1319,7 @@ batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node); if (orig_entry) { found = true; - batadv_tt_orig_list_entry_free_ref(orig_entry); + batadv_tt_orig_list_entry_put(orig_entry); } return found; @@ -1307,11 +1345,12 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, goto out; INIT_HLIST_NODE(&orig_entry->list); - atomic_inc(&orig_node->refcount); + kref_get(&orig_node->refcount); batadv_tt_global_size_inc(orig_node, tt_global->common.vid); orig_entry->orig_node = orig_node; orig_entry->ttvn = ttvn; - atomic_set(&orig_entry->refcount, 2); + kref_init(&orig_entry->refcount); + kref_get(&orig_entry->refcount); spin_lock_bh(&tt_global->list_lock); hlist_add_head_rcu(&orig_entry->list, @@ -1321,7 +1360,7 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, out: if (orig_entry) - batadv_tt_orig_list_entry_free_ref(orig_entry); + batadv_tt_orig_list_entry_put(orig_entry); } /** @@ -1341,7 +1380,7 @@ out: * * The caller must hold orig_node refcount. * - * Return true if the new entry has been added, false otherwise + * Return: true if the new entry has been added, false otherwise */ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, @@ -1387,7 +1426,8 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, */ if (flags & BATADV_TT_CLIENT_ROAM) tt_global_entry->roam_at = jiffies; - atomic_set(&common->refcount, 2); + kref_init(&common->refcount); + kref_get(&common->refcount); common->added_at = jiffies; INIT_HLIST_HEAD(&tt_global_entry->orig_list); @@ -1401,7 +1441,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv, if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); goto out_remove; } } else { @@ -1487,9 +1527,9 @@ out_remove: out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); if (tt_local_entry) - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); return ret; } @@ -1499,7 +1539,7 @@ out: * @tt_global_entry: global translation table entry to be analyzed * * This functon assumes the caller holds rcu_read_lock(). - * Returns best originator list entry or NULL on errors. + * Return: best originator list entry or NULL on errors. */ static struct batadv_tt_orig_list_entry * batadv_transtable_best_orig(struct batadv_priv *bat_priv, @@ -1520,20 +1560,20 @@ batadv_transtable_best_orig(struct batadv_priv *bat_priv, if (best_router && bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT, best_router, BATADV_IF_DEFAULT) <= 0) { - batadv_neigh_node_free_ref(router); + batadv_neigh_node_put(router); continue; } /* release the refcount for the "old" best */ if (best_router) - batadv_neigh_node_free_ref(best_router); + batadv_neigh_node_put(best_router); best_entry = orig_entry; best_router = router; } if (best_router) - batadv_neigh_node_free_ref(best_router); + batadv_neigh_node_put(best_router); return best_entry; } @@ -1586,7 +1626,7 @@ batadv_tt_global_print_entry(struct batadv_priv *bat_priv, ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'), ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.')); - batadv_orig_node_vlan_free_ref(vlan); + batadv_orig_node_vlan_put(vlan); } print_list: @@ -1618,7 +1658,7 @@ print_list: ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'), ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.')); - batadv_orig_node_vlan_free_ref(vlan); + batadv_orig_node_vlan_put(vlan); } } @@ -1659,7 +1699,7 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) } out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); return 0; } @@ -1687,7 +1727,7 @@ _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry, * being part of a list */ hlist_del_rcu(&orig_entry->list); - batadv_tt_orig_list_entry_free_ref(orig_entry); + batadv_tt_orig_list_entry_put(orig_entry); } /* deletes the orig list of a tt_global_entry */ @@ -1843,9 +1883,9 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv, out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); if (local_entry) - batadv_tt_local_entry_free_ref(local_entry); + batadv_tt_local_entry_put(local_entry); } /** @@ -1899,7 +1939,7 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, tt_global->common.addr, BATADV_PRINT_VID(vid), message); hlist_del_rcu(&tt_common_entry->hash_entry); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_put(tt_global); } } spin_unlock_bh(list_lock); @@ -1962,7 +2002,7 @@ static void batadv_tt_global_purge(struct batadv_priv *bat_priv) hlist_del_rcu(&tt_common->hash_entry); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_put(tt_global); } spin_unlock_bh(list_lock); } @@ -1994,7 +2034,7 @@ static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); - batadv_tt_global_entry_free_ref(tt_global); + batadv_tt_global_entry_put(tt_global); } spin_unlock_bh(list_lock); } @@ -2029,7 +2069,7 @@ _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, * @addr: mac address of the destination client * @vid: VLAN identifier * - * Returns a pointer to the originator that was selected as destination in the + * Return: a pointer to the originator that was selected as destination in the * mesh for contacting the client 'addr', NULL otherwise. * In case of multiple originators serving the same client, the function returns * the best one (best in terms of metric towards the destination node). @@ -2069,15 +2109,15 @@ struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, /* found anything? */ if (best_entry) orig_node = best_entry->orig_node; - if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) + if (orig_node && !kref_get_unless_zero(&orig_node->refcount)) orig_node = NULL; rcu_read_unlock(); out: if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); if (tt_local_entry) - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); return orig_node; } @@ -2104,7 +2144,7 @@ out: * because the XOR operation can combine them all while trying to reduce the * noise as much as possible. * - * Returns the checksum of the global table of a given originator. + * Return: the checksum of the global table of a given originator. */ static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, @@ -2181,7 +2221,7 @@ static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv, * For details about the computation, please refer to the documentation for * batadv_tt_global_crc(). * - * Returns the checksum of the local table + * Return: the checksum of the local table */ static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv, unsigned short vid) @@ -2287,7 +2327,7 @@ static void batadv_tt_req_purge(struct batadv_priv *bat_priv) * @bat_priv: the bat priv with all the soft interface information * @orig_node: orig node this request is being issued for * - * Returns the pointer to the new tt_req_node struct if no request + * Return: the pointer to the new tt_req_node struct if no request * has already been issued for this orig_node, NULL otherwise. */ static struct batadv_tt_req_node * @@ -2322,7 +2362,7 @@ unlock: * @entry_ptr: to be checked local tt entry * @data_ptr: not used but definition required to satisfy the callback prototype * - * Returns 1 if the entry is a valid, 0 otherwise. + * Return: 1 if the entry is a valid, 0 otherwise. */ static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr) { @@ -2406,9 +2446,8 @@ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, * @orig_node: originator for which the CRCs have to be checked * @tt_vlan: pointer to the first tvlv VLAN entry * @num_vlan: number of tvlv VLAN entries - * @create: if true, create VLAN objects if not found * - * Return true if all the received CRCs match the locally stored ones, false + * Return: true if all the received CRCs match the locally stored ones, false * otherwise */ static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node, @@ -2438,7 +2477,7 @@ static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node, return false; crc = vlan->tt.crc; - batadv_orig_node_vlan_free_ref(vlan); + batadv_orig_node_vlan_put(vlan); if (crc != ntohl(tt_vlan_tmp->crc)) return false; @@ -2511,6 +2550,8 @@ static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv, * @num_vlan: number of tvlv VLAN entries * @full_table: ask for the entire translation table if true, while only for the * last TT diff otherwise + * + * Return: true if the TT Request was sent, false otherwise */ static int batadv_send_tt_request(struct batadv_priv *bat_priv, struct batadv_orig_node *dst_orig_node, @@ -2571,7 +2612,7 @@ static int batadv_send_tt_request(struct batadv_priv *bat_priv, out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); if (ret && tt_req_node) { spin_lock_bh(&bat_priv->tt.req_list_lock); /* hlist_del_init() verifies tt_req_node still is in the list */ @@ -2591,7 +2632,7 @@ out: * @req_src: mac address of tt request sender * @req_dst: mac address of tt request recipient * - * Returns true if tt request reply was sent, false otherwise. + * Return: true if tt request reply was sent, false otherwise. */ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, struct batadv_tvlv_tt_data *tt_data, @@ -2709,9 +2750,9 @@ unlock: out: if (res_dst_orig_node) - batadv_orig_node_free_ref(res_dst_orig_node); + batadv_orig_node_put(res_dst_orig_node); if (req_dst_orig_node) - batadv_orig_node_free_ref(req_dst_orig_node); + batadv_orig_node_put(req_dst_orig_node); kfree(tvlv_tt_data); return ret; } @@ -2723,7 +2764,7 @@ out: * @tt_data: tt data containing the tt request information * @req_src: mac address of tt request sender * - * Returns true if tt request reply was sent, false otherwise. + * Return: true if tt request reply was sent, false otherwise. */ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, struct batadv_tvlv_tt_data *tt_data, @@ -2826,9 +2867,9 @@ unlock: out: spin_unlock_bh(&bat_priv->tt.commit_lock); if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); kfree(tvlv_tt_data); /* The packet was for this host, so it doesn't need to be re-routed */ return true; @@ -2841,7 +2882,7 @@ out: * @req_src: mac address of tt request sender * @req_dst: mac address of tt request recipient * - * Returns true if tt request reply was sent, false otherwise. + * Return: true if tt request reply was sent, false otherwise. */ static bool batadv_send_tt_response(struct batadv_priv *bat_priv, struct batadv_tvlv_tt_data *tt_data, @@ -2914,7 +2955,7 @@ static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } static void batadv_tt_update_changes(struct batadv_priv *bat_priv, @@ -2936,7 +2977,7 @@ static void batadv_tt_update_changes(struct batadv_priv *bat_priv, * @addr: the mac address of the client to check * @vid: VLAN identifier * - * Returns true if the client is served by this node, false otherwise. + * Return: true if the client is served by this node, false otherwise. */ bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr, unsigned short vid) @@ -2956,7 +2997,7 @@ bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr, ret = true; out: if (tt_local_entry) - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); return ret; } @@ -3020,7 +3061,7 @@ static void batadv_handle_tt_response(struct batadv_priv *bat_priv, spin_unlock_bh(&bat_priv->tt.req_list_lock); out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); } static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) @@ -3053,11 +3094,16 @@ static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) spin_unlock_bh(&bat_priv->tt.roam_list_lock); } -/* This function checks whether the client already reached the +/** + * batadv_tt_check_roam_count - check if a client has roamed too frequently + * @bat_priv: the bat priv with all the soft interface information + * @client: mac address of the roaming client + * + * This function checks whether the client already reached the * maximum number of possible roaming phases. In this case the ROAMING_ADV * will not be sent. * - * returns true if the ROAMING_ADV can be sent, false otherwise + * Return: true if the ROAMING_ADV can be sent, false otherwise */ static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client) { @@ -3146,7 +3192,7 @@ static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client, out: if (primary_if) - batadv_hardif_free_ref(primary_if); + batadv_hardif_put(primary_if); } static void batadv_tt_purge(struct work_struct *work) @@ -3237,7 +3283,6 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common; struct batadv_tt_local_entry *tt_local; - struct batadv_softif_vlan *vlan; struct hlist_node *node_tmp; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ @@ -3267,14 +3312,7 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) struct batadv_tt_local_entry, common); - /* decrease the reference held for this vlan */ - vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid); - if (vlan) { - batadv_softif_vlan_free_ref(vlan); - batadv_softif_vlan_free_ref(vlan); - } - - batadv_tt_local_entry_free_ref(tt_local); + batadv_tt_local_entry_put(tt_local); } spin_unlock_bh(list_lock); } @@ -3357,11 +3395,11 @@ bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst, ret = true; out: - batadv_softif_vlan_free_ref(vlan); + batadv_softif_vlan_put(vlan); if (tt_global_entry) - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); if (tt_local_entry) - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); return ret; } @@ -3369,13 +3407,12 @@ out: * batadv_tt_update_orig - update global translation table with new tt * information received via ogms * @bat_priv: the bat priv with all the soft interface information - * @orig: the orig_node of the ogm - * @tt_vlan: pointer to the first tvlv VLAN entry + * @orig_node: the orig_node of the ogm + * @tt_buff: pointer to the first tvlv VLAN entry * @tt_num_vlan: number of tvlv VLAN entries * @tt_change: pointer to the first entry in the TT buffer * @tt_num_changes: number of tt changes inside the tt buffer * @ttvn: translation table version number of this changeset - * @tt_crc: crc32 checksum of orig node's translation table */ static void batadv_tt_update_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, @@ -3457,7 +3494,7 @@ request_table: * @addr: the mac address of the client to check * @vid: VLAN identifier * - * Returns true if we know that the client has moved from its old originator + * Return: true if we know that the client has moved from its old originator * to another one. This entry is still kept for consistency purposes and will be * deleted later by a DEL or because of timeout */ @@ -3472,7 +3509,7 @@ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, goto out; ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; - batadv_tt_global_entry_free_ref(tt_global_entry); + batadv_tt_global_entry_put(tt_global_entry); out: return ret; } @@ -3483,7 +3520,7 @@ out: * @addr: the mac address of the local client to query * @vid: VLAN identifier * - * Returns true if the local client is known to be roaming (it is not served by + * Return: true if the local client is known to be roaming (it is not served by * this node anymore) or not. If yes, the client is still present in the table * to keep the latter consistent with the node TTVN */ @@ -3498,7 +3535,7 @@ bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, goto out; ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; - batadv_tt_local_entry_free_ref(tt_local_entry); + batadv_tt_local_entry_put(tt_local_entry); out: return ret; } @@ -3612,7 +3649,7 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, * @tvlv_value: tvlv buffer containing the tt data * @tvlv_value_len: tvlv buffer length * - * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS + * Return: NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS * otherwise. */ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, @@ -3693,7 +3730,7 @@ static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, * @tvlv_value: tvlv buffer containing the tt data * @tvlv_value_len: tvlv buffer length * - * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS + * Return: NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS * otherwise. */ static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, @@ -3731,7 +3768,7 @@ static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv, out: if (orig_node) - batadv_orig_node_free_ref(orig_node); + batadv_orig_node_put(orig_node); return NET_RX_SUCCESS; } @@ -3739,7 +3776,7 @@ out: * batadv_tt_init - initialise the translation table internals * @bat_priv: the bat priv with all the soft interface information * - * Return 0 on success or negative error number in case of failure. + * Return: 0 on success or negative error number in case of failure. */ int batadv_tt_init(struct batadv_priv *bat_priv) { @@ -3777,7 +3814,7 @@ int batadv_tt_init(struct batadv_priv *bat_priv) * @addr: the mac address of the client * @vid: the identifier of the VLAN where this client is connected * - * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false + * Return: true if the client is marked with the TT_CLIENT_ISOLA flag, false * otherwise */ bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, @@ -3792,7 +3829,7 @@ bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv, ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA; - batadv_tt_global_entry_free_ref(tt); + batadv_tt_global_entry_put(tt); return ret; } diff --git a/net/batman-adv/translation-table.h b/net/batman-adv/translation-table.h index abd8e116e5fb..7c7e2c006bfe 100644 --- a/net/batman-adv/translation-table.h +++ b/net/batman-adv/translation-table.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich, Antonio Quartulli * diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 3437b667a2cd..1e47fbe8bb7b 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2007-2015 B.A.T.M.A.N. contributors: +/* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * @@ -22,9 +22,11 @@ #error only "main.h" can be included directly #endif +#include <linux/average.h> #include <linux/bitops.h> #include <linux/compiler.h> #include <linux/if_ether.h> +#include <linux/kref.h> #include <linux/netdevice.h> #include <linux/sched.h> /* for linux/wait.h */ #include <linux/spinlock.h> @@ -73,7 +75,7 @@ enum batadv_dhcp_recipient { #define BATADV_TT_SYNC_MASK 0x00F0 /** - * struct batadv_hard_iface_bat_iv - per hard interface B.A.T.M.A.N. IV data + * struct batadv_hard_iface_bat_iv - per hard-interface B.A.T.M.A.N. IV data * @ogm_buff: buffer holding the OGM packet * @ogm_buff_len: length of the OGM packet buffer * @ogm_seqno: OGM sequence number - used to identify each OGM @@ -85,6 +87,36 @@ struct batadv_hard_iface_bat_iv { }; /** + * enum batadv_v_hard_iface_flags - interface flags useful to B.A.T.M.A.N. V + * @BATADV_FULL_DUPLEX: tells if the connection over this link is full-duplex + * @BATADV_WARNING_DEFAULT: tells whether we have warned the user that no + * throughput data is available for this interface and that default values are + * assumed. + */ +enum batadv_v_hard_iface_flags { + BATADV_FULL_DUPLEX = BIT(0), + BATADV_WARNING_DEFAULT = BIT(1), +}; + +/** + * struct batadv_hard_iface_bat_v - per hard-interface B.A.T.M.A.N. V data + * @elp_interval: time interval between two ELP transmissions + * @elp_seqno: current ELP sequence number + * @elp_skb: base skb containing the ELP message to send + * @elp_wq: workqueue used to schedule ELP transmissions + * @throughput_override: throughput override to disable link auto-detection + * @flags: interface specific flags + */ +struct batadv_hard_iface_bat_v { + atomic_t elp_interval; + atomic_t elp_seqno; + struct sk_buff *elp_skb; + struct delayed_work elp_wq; + atomic_t throughput_override; + u8 flags; +}; + +/** * struct batadv_hard_iface - network device known to batman-adv * @list: list node for batadv_hardif_list * @if_num: identificator of the interface @@ -97,8 +129,9 @@ struct batadv_hard_iface_bat_iv { * batman-adv for this interface * @soft_iface: the batman-adv interface which uses this network interface * @rcu: struct used for freeing in an RCU-safe manner - * @bat_iv: BATMAN IV specific per hard interface data - * @cleanup_work: work queue callback item for hard interface deinit + * @bat_iv: per hard-interface B.A.T.M.A.N. IV data + * @bat_v: per hard-interface B.A.T.M.A.N. V data + * @cleanup_work: work queue callback item for hard-interface deinit * @debug_dir: dentry for nc subdir in batman-adv directory in debugfs * @neigh_list: list of unique single hop neighbors via this interface * @neigh_list_lock: lock protecting neigh_list @@ -110,11 +143,14 @@ struct batadv_hard_iface { struct net_device *net_dev; u8 num_bcasts; struct kobject *hardif_obj; - atomic_t refcount; + struct kref refcount; struct packet_type batman_adv_ptype; struct net_device *soft_iface; struct rcu_head rcu; struct batadv_hard_iface_bat_iv bat_iv; +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_hard_iface_bat_v bat_v; +#endif struct work_struct cleanup_work; struct dentry *debug_dir; struct hlist_head neigh_list; @@ -125,10 +161,11 @@ struct batadv_hard_iface { /** * struct batadv_orig_ifinfo - originator info per outgoing interface * @list: list node for orig_node::ifinfo_list - * @if_outgoing: pointer to outgoing hard interface + * @if_outgoing: pointer to outgoing hard-interface * @router: router that should be used to reach this originator * @last_real_seqno: last and best known sequence number * @last_ttl: ttl of last received packet + * @last_seqno_forwarded: seqno of the OGM which was forwarded last * @batman_seqno_reset: time when the batman seqno window was reset * @refcount: number of contexts the object is used * @rcu: struct used for freeing in an RCU-safe manner @@ -139,8 +176,9 @@ struct batadv_orig_ifinfo { struct batadv_neigh_node __rcu *router; /* rcu protected pointer */ u32 last_real_seqno; u8 last_ttl; + u32 last_seqno_forwarded; unsigned long batman_seqno_reset; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -196,13 +234,13 @@ struct batadv_orig_node_vlan { unsigned short vid; struct batadv_vlan_tt tt; struct hlist_node list; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; /** * struct batadv_orig_bat_iv - B.A.T.M.A.N. IV private orig_node members - * @bcast_own: set of bitfields (one per hard interface) where each one counts + * @bcast_own: set of bitfields (one per hard-interface) where each one counts * the number of our OGMs this orig_node rebroadcasted "back" to us (relative * to last_real_seqno). Every bitfield is BATADV_TQ_LOCAL_WINDOW_SIZE bits long. * @bcast_own_sum: sum of bcast_own @@ -298,7 +336,7 @@ struct batadv_orig_node { struct batadv_priv *bat_priv; /* bcast_seqno_lock protects: bcast_bits & last_bcast_seqno */ spinlock_t bcast_seqno_lock; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; #ifdef CONFIG_BATMAN_ADV_NC struct list_head in_coding_list; @@ -341,15 +379,36 @@ struct batadv_gw_node { struct batadv_orig_node *orig_node; u32 bandwidth_down; u32 bandwidth_up; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; +DECLARE_EWMA(throughput, 1024, 8) + +/** + * struct batadv_hardif_neigh_node_bat_v - B.A.T.M.A.N. V private neighbor + * information + * @throughput: ewma link throughput towards this neighbor + * @elp_interval: time interval between two ELP transmissions + * @elp_latest_seqno: latest and best known ELP sequence number + * @last_unicast_tx: when the last unicast packet has been sent to this neighbor + * @metric_work: work queue callback item for metric update + */ +struct batadv_hardif_neigh_node_bat_v { + struct ewma_throughput throughput; + u32 elp_interval; + u32 elp_latest_seqno; + unsigned long last_unicast_tx; + struct work_struct metric_work; +}; + /** - * batadv_hardif_neigh_node - unique neighbor per hard interface + * struct batadv_hardif_neigh_node - unique neighbor per hard-interface * @list: list node for batadv_hard_iface::neigh_list * @addr: the MAC address of the neighboring interface - * @if_incoming: pointer to incoming hard interface + * @if_incoming: pointer to incoming hard-interface + * @last_seen: when last packet via this neighbor was received + * @bat_v: B.A.T.M.A.N. V private data * @refcount: number of contexts the object is used * @rcu: struct used for freeing in a RCU-safe manner */ @@ -358,7 +417,10 @@ struct batadv_hardif_neigh_node { u8 addr[ETH_ALEN]; struct batadv_hard_iface *if_incoming; unsigned long last_seen; - atomic_t refcount; +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_hardif_neigh_node_bat_v bat_v; +#endif + struct kref refcount; struct rcu_head rcu; }; @@ -369,8 +431,9 @@ struct batadv_hardif_neigh_node { * @addr: the MAC address of the neighboring interface * @ifinfo_list: list for routing metrics per outgoing interface * @ifinfo_lock: lock protecting private ifinfo members and list - * @if_incoming: pointer to incoming hard interface + * @if_incoming: pointer to incoming hard-interface * @last_seen: when last packet via this neighbor was received + * @hardif_neigh: hardif_neigh of this neighbor * @refcount: number of contexts the object is used * @rcu: struct used for freeing in an RCU-safe manner */ @@ -382,13 +445,14 @@ struct batadv_neigh_node { spinlock_t ifinfo_lock; /* protects ifinfo_list and its members */ struct batadv_hard_iface *if_incoming; unsigned long last_seen; - atomic_t refcount; + struct batadv_hardif_neigh_node *hardif_neigh; + struct kref refcount; struct rcu_head rcu; }; /** * struct batadv_neigh_ifinfo_bat_iv - neighbor information per outgoing - * interface for BATMAN IV + * interface for B.A.T.M.A.N. IV * @tq_recv: ring buffer of received TQ values from this neigh node * @tq_index: ring buffer index * @tq_avg: averaged tq of all tq values in the ring buffer (tq_recv) @@ -405,10 +469,22 @@ struct batadv_neigh_ifinfo_bat_iv { }; /** + * struct batadv_neigh_ifinfo_bat_v - neighbor information per outgoing + * interface for B.A.T.M.A.N. V + * @throughput: last throughput metric received from originator via this neigh + * @last_seqno: last sequence number known for this neighbor + */ +struct batadv_neigh_ifinfo_bat_v { + u32 throughput; + u32 last_seqno; +}; + +/** * struct batadv_neigh_ifinfo - neighbor information per outgoing interface * @list: list node for batadv_neigh_node::ifinfo_list - * @if_outgoing: pointer to outgoing hard interface + * @if_outgoing: pointer to outgoing hard-interface * @bat_iv: B.A.T.M.A.N. IV private structure + * @bat_v: B.A.T.M.A.N. V private data * @last_ttl: last received ttl from this neigh node * @refcount: number of contexts the object is used * @rcu: struct used for freeing in a RCU-safe manner @@ -417,8 +493,11 @@ struct batadv_neigh_ifinfo { struct hlist_node list; struct batadv_hard_iface *if_outgoing; struct batadv_neigh_ifinfo_bat_iv bat_iv; +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_neigh_ifinfo_bat_v bat_v; +#endif u8 last_ttl; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -744,11 +823,25 @@ struct batadv_softif_vlan { atomic_t ap_isolation; /* boolean */ struct batadv_vlan_tt tt; struct hlist_node list; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; /** + * struct batadv_priv_bat_v - B.A.T.M.A.N. V per soft-interface private data + * @ogm_buff: buffer holding the OGM packet + * @ogm_buff_len: length of the OGM packet buffer + * @ogm_seqno: OGM sequence number - used to identify each OGM + * @ogm_wq: workqueue used to schedule OGM transmissions + */ +struct batadv_priv_bat_v { + unsigned char *ogm_buff; + int ogm_buff_len; + atomic_t ogm_seqno; + struct delayed_work ogm_wq; +}; + +/** * struct batadv_priv - per mesh interface data * @mesh_state: current status of the mesh (inactive/active/deactivating) * @soft_iface: net device which holds this struct as private data @@ -771,6 +864,9 @@ struct batadv_softif_vlan { * @orig_interval: OGM broadcast interval in milliseconds * @hop_penalty: penalty which will be applied to an OGM's tq-field on every hop * @log_level: configured log level (see batadv_dbg_level) + * @isolation_mark: the skb->mark value used to match packets for AP isolation + * @isolation_mark_mask: bitmask identifying the bits in skb->mark to be used + * for the isolation mark * @bcast_seqno: last sent broadcast packet sequence number * @bcast_queue_left: number of remaining buffered broadcast packet slots * @batman_queue_left: number of remaining OGM packet slots @@ -783,8 +879,8 @@ struct batadv_softif_vlan { * @forw_bat_list_lock: lock protecting forw_bat_list * @forw_bcast_list_lock: lock protecting forw_bcast_list * @orig_work: work queue callback item for orig node purging - * @cleanup_work: work queue callback item for soft interface deinit - * @primary_if: one of the hard interfaces assigned to this mesh interface + * @cleanup_work: work queue callback item for soft-interface deinit + * @primary_if: one of the hard-interfaces assigned to this mesh interface * becomes the primary interface * @bat_algo_ops: routing algorithm used by this mesh interface * @softif_vlan_list: a list of softif_vlan structs, one per VLAN created on top @@ -799,6 +895,7 @@ struct batadv_softif_vlan { * @mcast: multicast data * @network_coding: bool indicating whether network coding is enabled * @nc: network coding data + * @bat_v: B.A.T.M.A.N. V per soft-interface private data */ struct batadv_priv { atomic_t mesh_state; @@ -864,6 +961,9 @@ struct batadv_priv { atomic_t network_coding; struct batadv_priv_nc nc; #endif /* CONFIG_BATMAN_ADV_NC */ +#ifdef CONFIG_BATMAN_ADV_BATMAN_V + struct batadv_priv_bat_v bat_v; +#endif }; /** @@ -925,7 +1025,7 @@ struct batadv_bla_backbone_gw { atomic_t request_sent; u16 crc; spinlock_t crc_lock; /* protects crc */ - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -946,7 +1046,7 @@ struct batadv_bla_claim { unsigned long lasttime; struct hlist_node hash_entry; struct rcu_head rcu; - atomic_t refcount; + struct kref refcount; }; #endif @@ -967,7 +1067,7 @@ struct batadv_tt_common_entry { struct hlist_node hash_entry; u16 flags; unsigned long added_at; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -975,10 +1075,12 @@ struct batadv_tt_common_entry { * struct batadv_tt_local_entry - translation table local entry data * @common: general translation table data * @last_seen: timestamp used for purging stale tt local entries + * @vlan: soft-interface vlan of the entry */ struct batadv_tt_local_entry { struct batadv_tt_common_entry common; unsigned long last_seen; + struct batadv_softif_vlan *vlan; }; /** @@ -1009,7 +1111,7 @@ struct batadv_tt_orig_list_entry { struct batadv_orig_node *orig_node; u8 ttvn; struct hlist_node list; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -1062,7 +1164,7 @@ struct batadv_tt_roam_node { struct batadv_nc_node { struct list_head list; u8 addr[ETH_ALEN]; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; struct batadv_orig_node *orig_node; unsigned long last_seen; @@ -1082,7 +1184,7 @@ struct batadv_nc_node { struct batadv_nc_path { struct hlist_node hash_entry; struct rcu_head rcu; - atomic_t refcount; + struct kref refcount; struct list_head packet_list; spinlock_t packet_list_lock; /* Protects packet_list */ u8 next_hop[ETH_ALEN]; @@ -1152,6 +1254,8 @@ struct batadv_forw_packet { * struct batadv_algo_ops - mesh algorithm callbacks * @list: list node for the batadv_algo_list * @name: name of the algorithm + * @bat_iface_activate: start routing mechanisms when hard-interface is brought + * up * @bat_iface_enable: init routing info when hard-interface is enabled * @bat_iface_disable: de-init routing info when hard-interface is disabled * @bat_iface_update_mac: (re-)init mac addresses of the protocol information @@ -1179,6 +1283,7 @@ struct batadv_forw_packet { struct batadv_algo_ops { struct hlist_node list; char *name; + void (*bat_iface_activate)(struct batadv_hard_iface *hard_iface); int (*bat_iface_enable)(struct batadv_hard_iface *hard_iface); void (*bat_iface_disable)(struct batadv_hard_iface *hard_iface); void (*bat_iface_update_mac)(struct batadv_hard_iface *hard_iface); @@ -1225,7 +1330,7 @@ struct batadv_dat_entry { unsigned short vid; unsigned long last_update; struct hlist_node hash_entry; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; @@ -1261,7 +1366,7 @@ struct batadv_dat_candidate { struct batadv_tvlv_container { struct hlist_node list; struct batadv_tvlv_hdr tvlv_hdr; - atomic_t refcount; + struct kref refcount; }; /** @@ -1288,7 +1393,7 @@ struct batadv_tvlv_handler { u8 type; u8 version; u8 flags; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; }; |