diff options
Diffstat (limited to 'net/batman-adv/translation-table.c')
| -rw-r--r-- | net/batman-adv/translation-table.c | 150 |
1 files changed, 134 insertions, 16 deletions
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c index 4c28251dd8e6..a3c965dd1d96 100644 --- a/net/batman-adv/translation-table.c +++ b/net/batman-adv/translation-table.c @@ -401,6 +401,35 @@ static uint16_t batadv_tt_entries(uint16_t tt_len) return tt_len / batadv_tt_len(1); } +/** + * batadv_tt_local_table_transmit_size - calculates the local translation table + * size when transmitted over the air + * @bat_priv: the bat priv with all the soft interface information + * + * Returns local translation table size in bytes. + */ +static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) +{ + uint16_t num_vlan = 0, tt_local_entries = 0; + struct batadv_softif_vlan *vlan; + int hdr_size; + + rcu_read_lock(); + hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + num_vlan++; + tt_local_entries += atomic_read(&vlan->tt.num_entries); + } + rcu_read_unlock(); + + /* header size of tvlv encapsulated tt response payload */ + hdr_size = sizeof(struct batadv_unicast_tvlv_packet); + hdr_size += sizeof(struct batadv_tvlv_hdr); + hdr_size += sizeof(struct batadv_tvlv_tt_data); + hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data); + + return hdr_size + batadv_tt_len(tt_local_entries); +} + static int batadv_tt_local_init(struct batadv_priv *bat_priv) { if (bat_priv->tt.local_hash) @@ -439,8 +468,10 @@ static void batadv_tt_global_free(struct batadv_priv *bat_priv, * @vid: VLAN identifier * @ifindex: index of the interface where the client is connected to (useful to * identify wireless clients) + * + * Returns true if the client was successfully added, false otherwise. */ -void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, +bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, unsigned short vid, int ifindex) { struct batadv_priv *bat_priv = netdev_priv(soft_iface); @@ -448,8 +479,8 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, struct batadv_tt_global_entry *tt_global; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry; - int hash_added; - bool roamed_back = false; + int hash_added, table_size, packet_size_max; + bool ret = false, roamed_back = false; tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid); tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); @@ -484,6 +515,17 @@ void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, goto check_roaming; } + /* Ignore the client if we cannot send it in a full table response. */ + table_size = batadv_tt_local_table_transmit_size(bat_priv); + table_size += batadv_tt_len(1); + packet_size_max = atomic_read(&bat_priv->packet_size_max); + if (table_size > packet_size_max) { + net_ratelimited_function(batadv_info, soft_iface, + "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n", + table_size, packet_size_max, addr); + goto out; + } + tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); if (!tt_local) goto out; @@ -550,11 +592,14 @@ check_roaming: } } + ret = true; + out: if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global) batadv_tt_global_entry_free_ref(tt_global); + return ret; } /** @@ -926,8 +971,16 @@ out: return curr_flags; } +/** + * batadv_tt_local_purge_list - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @head: pointer to the list containing the local tt entries + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, - struct hlist_head *head) + struct hlist_head *head, + int timeout) { struct batadv_tt_local_entry *tt_local_entry; struct batadv_tt_common_entry *tt_common_entry; @@ -945,8 +998,7 @@ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) continue; - if (!batadv_has_timed_out(tt_local_entry->last_seen, - BATADV_TT_LOCAL_TIMEOUT)) + if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout)) continue; batadv_tt_local_set_pending(bat_priv, tt_local_entry, @@ -954,7 +1006,14 @@ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, } } -static void batadv_tt_local_purge(struct batadv_priv *bat_priv) +/** + * batadv_tt_local_purge - purge inactive tt local entries + * @bat_priv: the bat priv with all the soft interface information + * @timeout: parameter deciding whether a given tt local entry is considered + * inactive or not + */ +static void batadv_tt_local_purge(struct batadv_priv *bat_priv, + int timeout) { struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct hlist_head *head; @@ -966,7 +1025,7 @@ static void batadv_tt_local_purge(struct batadv_priv *bat_priv) list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); - batadv_tt_local_purge_list(bat_priv, head); + batadv_tt_local_purge_list(bat_priv, head, timeout); spin_unlock_bh(list_lock); } } @@ -2383,6 +2442,15 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, req_dst_orig_node); } + /* Don't send the response, if larger than fragmented packet. */ + tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len; + if (tt_len > atomic_read(&bat_priv->packet_size_max)) { + net_ratelimited_function(batadv_info, bat_priv->soft_iface, + "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n", + res_dst_orig_node->orig); + goto out; + } + tvlv_tt_data->flags = BATADV_TT_RESPONSE; tvlv_tt_data->ttvn = req_ttvn; @@ -2859,7 +2927,7 @@ static void batadv_tt_purge(struct work_struct *work) priv_tt = container_of(delayed_work, struct batadv_priv_tt, work); bat_priv = container_of(priv_tt, struct batadv_priv, tt); - batadv_tt_local_purge(bat_priv); + batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT); batadv_tt_global_purge(bat_priv); batadv_tt_req_purge(bat_priv); batadv_tt_roam_purge(bat_priv); @@ -2972,18 +3040,18 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) } /** - * batadv_tt_local_commit_changes - commit all pending local tt changes which - * have been queued in the time since the last commit + * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes + * which have been queued in the time since the last commit * @bat_priv: the bat priv with all the soft interface information + * + * Caller must hold tt->commit_lock. */ -void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) +static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv) { - spin_lock_bh(&bat_priv->tt.commit_lock); - if (atomic_read(&bat_priv->tt.local_changes) < 1) { if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt)) batadv_tt_tvlv_container_update(bat_priv); - goto out; + return; } batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true); @@ -3000,8 +3068,17 @@ void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) /* reset the sending counter */ atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); batadv_tt_tvlv_container_update(bat_priv); +} -out: +/** + * batadv_tt_local_commit_changes - commit all pending local tt changes which + * have been queued in the time since the last commit + * @bat_priv: the bat priv with all the soft interface information + */ +void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv) +{ + spin_lock_bh(&bat_priv->tt.commit_lock); + batadv_tt_local_commit_changes_nolock(bat_priv); spin_unlock_bh(&bat_priv->tt.commit_lock); } @@ -3197,6 +3274,47 @@ out: } /** + * batadv_tt_local_resize_to_mtu - resize the local translation table fit the + * maximum packet size that can be transported through the mesh + * @soft_iface: netdev struct of the mesh interface + * + * Remove entries older than 'timeout' and half timeout if more entries need + * to be removed. + */ +void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface) +{ + struct batadv_priv *bat_priv = netdev_priv(soft_iface); + int packet_size_max = atomic_read(&bat_priv->packet_size_max); + int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2; + bool reduced = false; + + spin_lock_bh(&bat_priv->tt.commit_lock); + + while (true) { + table_size = batadv_tt_local_table_transmit_size(bat_priv); + if (packet_size_max >= table_size) + break; + + batadv_tt_local_purge(bat_priv, timeout); + batadv_tt_local_purge_pending_clients(bat_priv); + + timeout /= 2; + reduced = true; + net_ratelimited_function(batadv_info, soft_iface, + "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n", + packet_size_max); + } + + /* commit these changes immediately, to avoid synchronization problem + * with the TTVN + */ + if (reduced) + batadv_tt_local_commit_changes_nolock(bat_priv); + + spin_unlock_bh(&bat_priv->tt.commit_lock); +} + +/** * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container * @bat_priv: the bat priv with all the soft interface information * @orig: the orig_node of the ogm |