batman-adv: netlink: add translation table query

This adds the commands BATADV_CMD_GET_TRANSTABLE_LOCAL and
BATADV_CMD_GET_TRANSTABLE_GLOBAL, which correspond to the transtable_local
and transtable_global debugfs files.

The batadv_tt_client_flags enum is moved to the UAPI to expose it as part
of the netlink API.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
[sven.eckelmann@open-mesh.com: add policy for attributes, fix includes]
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
[sw@simonwunderlich.de: fix VID attributes content]
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>

1 files changed, 377 insertions, 0 deletions

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index af2bfef6dca8..20804078293c 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -37,20 +37,27 @@
 #include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/netdevice.h>
+#include <linux/netlink.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/seq_file.h>
+#include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/stddef.h>
 #include <linux/string.h>
 #include <linux/workqueue.h>
+#include <net/genetlink.h>
+#include <net/netlink.h>
+#include <net/sock.h>
+#include <uapi/linux/batman_adv.h>
 
 #include "bridge_loop_avoidance.h"
 #include "hard-interface.h"
 #include "hash.h"
 #include "log.h"
 #include "multicast.h"
+#include "netlink.h"
 #include "originator.h"
 #include "packet.h"
 #include "soft-interface.h"
@@ -1108,6 +1115,164 @@ out:
 	return 0;
 }
 
+/**
+ * batadv_tt_local_dump_entry - Dump one TT local entry into a message
+ * @msg :Netlink message to dump into
+ * @portid: Port making netlink request
+ * @seq: Sequence number of netlink message
+ * @bat_priv: The bat priv with all the soft interface information
+ * @common: tt local & tt global common data
+ *
+ * Return: Error code, or 0 on success
+ */
+static int
+batadv_tt_local_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+			   struct batadv_priv *bat_priv,
+			   struct batadv_tt_common_entry *common)
+{
+	void *hdr;
+	struct batadv_softif_vlan *vlan;
+	struct batadv_tt_local_entry *local;
+	unsigned int last_seen_msecs;
+	u32 crc;
+
+	local = container_of(common, struct batadv_tt_local_entry, common);
+	last_seen_msecs = jiffies_to_msecs(jiffies - local->last_seen);
+
+	vlan = batadv_softif_vlan_get(bat_priv, common->vid);
+	if (!vlan)
+		return 0;
+
+	crc = vlan->tt.crc;
+
+	batadv_softif_vlan_put(vlan);
+
+	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
+			  NLM_F_MULTI,
+			  BATADV_CMD_GET_TRANSTABLE_LOCAL);
+	if (!hdr)
+		return -ENOBUFS;
+
+	if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
+	    nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
+	    nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
+	    nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
+		goto nla_put_failure;
+
+	if (!(common->flags & BATADV_TT_CLIENT_NOPURGE) &&
+	    nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, last_seen_msecs))
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+	return 0;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+/**
+ * batadv_tt_local_dump_bucket - Dump one TT local bucket into a message
+ * @msg: Netlink message to dump into
+ * @portid: Port making netlink request
+ * @seq: Sequence number of netlink message
+ * @bat_priv: The bat priv with all the soft interface information
+ * @head: Pointer to the list containing the local tt entries
+ * @idx_s: Number of entries to skip
+ *
+ * Return: Error code, or 0 on success
+ */
+static int
+batadv_tt_local_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+			    struct batadv_priv *bat_priv,
+			    struct hlist_head *head, int *idx_s)
+{
+	struct batadv_tt_common_entry *common;
+	int idx = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(common, head, hash_entry) {
+		if (idx++ < *idx_s)
+			continue;
+
+		if (batadv_tt_local_dump_entry(msg, portid, seq, bat_priv,
+					       common)) {
+			rcu_read_unlock();
+			*idx_s = idx - 1;
+			return -EMSGSIZE;
+		}
+	}
+	rcu_read_unlock();
+
+	*idx_s = 0;
+	return 0;
+}
+
+/**
+ * batadv_tt_local_dump - Dump TT local entries into a message
+ * @msg: Netlink message to dump into
+ * @cb: Parameters from query
+ *
+ * Return: Error code, or 0 on success
+ */
+int batadv_tt_local_dump(struct sk_buff *msg, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(cb->skb->sk);
+	struct net_device *soft_iface;
+	struct batadv_priv *bat_priv;
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_hashtable *hash;
+	struct hlist_head *head;
+	int ret;
+	int ifindex;
+	int bucket = cb->args[0];
+	int idx = cb->args[1];
+	int portid = NETLINK_CB(cb->skb).portid;
+
+	ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
+	if (!ifindex)
+		return -EINVAL;
+
+	soft_iface = dev_get_by_index(net, ifindex);
+	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	hash = bat_priv->tt.local_hash;
+
+	while (bucket < hash->size) {
+		head = &hash->table[bucket];
+
+		if (batadv_tt_local_dump_bucket(msg, portid, cb->nlh->nlmsg_seq,
+						bat_priv, head, &idx))
+			break;
+
+		bucket++;
+	}
+
+	ret = msg->len;
+
+ out:
+	if (primary_if)
+		batadv_hardif_put(primary_if);
+	if (soft_iface)
+		dev_put(soft_iface);
+
+	cb->args[0] = bucket;
+	cb->args[1] = idx;
+
+	return ret;
+}
+
 static void
 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 			    struct batadv_tt_local_entry *tt_local_entry,
@@ -1756,6 +1921,218 @@ out:
 }
 
 /**
+ * batadv_tt_global_dump_subentry - Dump all TT local entries into a message
+ * @msg: Netlink message to dump into
+ * @portid: Port making netlink request
+ * @seq: Sequence number of netlink message
+ * @common: tt local & tt global common data
+ * @orig: Originator node announcing a non-mesh client
+ * @best: Is the best originator for the TT entry
+ *
+ * Return: Error code, or 0 on success
+ */
+static int
+batadv_tt_global_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
+			       struct batadv_tt_common_entry *common,
+			       struct batadv_tt_orig_list_entry *orig,
+			       bool best)
+{
+	void *hdr;
+	struct batadv_orig_node_vlan *vlan;
+	u8 last_ttvn;
+	u32 crc;
+
+	vlan = batadv_orig_node_vlan_get(orig->orig_node,
+					 common->vid);
+	if (!vlan)
+		return 0;
+
+	crc = vlan->tt.crc;
+
+	batadv_orig_node_vlan_put(vlan);
+
+	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
+			  NLM_F_MULTI,
+			  BATADV_CMD_GET_TRANSTABLE_GLOBAL);
+	if (!hdr)
+		return -ENOBUFS;
+
+	last_ttvn = atomic_read(&orig->orig_node->last_ttvn);
+
+	if (nla_put(msg, BATADV_ATTR_TT_ADDRESS, ETH_ALEN, common->addr) ||
+	    nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
+		    orig->orig_node->orig) ||
+	    nla_put_u8(msg, BATADV_ATTR_TT_TTVN, orig->ttvn) ||
+	    nla_put_u8(msg, BATADV_ATTR_TT_LAST_TTVN, last_ttvn) ||
+	    nla_put_u32(msg, BATADV_ATTR_TT_CRC32, crc) ||
+	    nla_put_u16(msg, BATADV_ATTR_TT_VID, common->vid) ||
+	    nla_put_u32(msg, BATADV_ATTR_TT_FLAGS, common->flags))
+		goto nla_put_failure;
+
+	if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+	return 0;
+
+ nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return -EMSGSIZE;
+}
+
+/**
+ * batadv_tt_global_dump_entry - Dump one TT global entry into a message
+ * @msg: Netlink message to dump into
+ * @portid: Port making netlink request
+ * @seq: Sequence number of netlink message
+ * @bat_priv: The bat priv with all the soft interface information
+ * @common: tt local & tt global common data
+ * @sub_s: Number of entries to skip
+ *
+ * This function assumes the caller holds rcu_read_lock().
+ *
+ * Return: Error code, or 0 on success
+ */
+static int
+batadv_tt_global_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
+			    struct batadv_priv *bat_priv,
+			    struct batadv_tt_common_entry *common, int *sub_s)
+{
+	struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
+	struct batadv_tt_global_entry *global;
+	struct hlist_head *head;
+	int sub = 0;
+	bool best;
+
+	global = container_of(common, struct batadv_tt_global_entry, common);
+	best_entry = batadv_transtable_best_orig(bat_priv, global);
+	head = &global->orig_list;
+
+	hlist_for_each_entry_rcu(orig_entry, head, list) {
+		if (sub++ < *sub_s)
+			continue;
+
+		best = (orig_entry == best_entry);
+
+		if (batadv_tt_global_dump_subentry(msg, portid, seq, common,
+						   orig_entry, best)) {
+			*sub_s = sub - 1;
+			return -EMSGSIZE;
+		}
+	}
+
+	*sub_s = 0;
+	return 0;
+}
+
+/**
+ * batadv_tt_global_dump_bucket - Dump one TT local bucket into a message
+ * @msg: Netlink message to dump into
+ * @portid: Port making netlink request
+ * @seq: Sequence number of netlink message
+ * @bat_priv: The bat priv with all the soft interface information
+ * @head: Pointer to the list containing the global tt entries
+ * @idx_s: Number of entries to skip
+ * @sub: Number of entries to skip
+ *
+ * Return: Error code, or 0 on success
+ */
+static int
+batadv_tt_global_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
+			     struct batadv_priv *bat_priv,
+			     struct hlist_head *head, int *idx_s, int *sub)
+{
+	struct batadv_tt_common_entry *common;
+	int idx = 0;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(common, head, hash_entry) {
+		if (idx++ < *idx_s)
+			continue;
+
+		if (batadv_tt_global_dump_entry(msg, portid, seq, bat_priv,
+						common, sub)) {
+			rcu_read_unlock();
+			*idx_s = idx - 1;
+			return -EMSGSIZE;
+		}
+	}
+	rcu_read_unlock();
+
+	*idx_s = 0;
+	*sub = 0;
+	return 0;
+}
+
+/**
+ * batadv_tt_global_dump -  Dump TT global entries into a message
+ * @msg: Netlink message to dump into
+ * @cb: Parameters from query
+ *
+ * Return: Error code, or length of message on success
+ */
+int batadv_tt_global_dump(struct sk_buff *msg, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(cb->skb->sk);
+	struct net_device *soft_iface;
+	struct batadv_priv *bat_priv;
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_hashtable *hash;
+	struct hlist_head *head;
+	int ret;
+	int ifindex;
+	int bucket = cb->args[0];
+	int idx = cb->args[1];
+	int sub = cb->args[2];
+	int portid = NETLINK_CB(cb->skb).portid;
+
+	ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX);
+	if (!ifindex)
+		return -EINVAL;
+
+	soft_iface = dev_get_by_index(net, ifindex);
+	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	hash = bat_priv->tt.global_hash;
+
+	while (bucket < hash->size) {
+		head = &hash->table[bucket];
+
+		if (batadv_tt_global_dump_bucket(msg, portid,
+						 cb->nlh->nlmsg_seq, bat_priv,
+						 head, &idx, &sub))
+			break;
+
+		bucket++;
+	}
+
+	ret = msg->len;
+
+ out:
+	if (primary_if)
+		batadv_hardif_put(primary_if);
+	if (soft_iface)
+		dev_put(soft_iface);
+
+	cb->args[0] = bucket;
+	cb->args[1] = idx;
+	cb->args[2] = sub;
+
+	return ret;
+}
+
+/**
  * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
  * @tt_global_entry: the global entry to remove the orig_entry from
  * @orig_entry: the orig entry to remove and free