/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich, 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA */ #include "main.h" #include "translation-table.h" #include "soft-interface.h" #include "hard-interface.h" #include "send.h" #include "hash.h" #include "originator.h" #include "routing.h" #include "bridge_loop_avoidance.h" #include /* hash class keys */ static struct lock_class_key batadv_tt_local_hash_lock_class_key; static struct lock_class_key batadv_tt_global_hash_lock_class_key; static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, struct batadv_orig_node *orig_node); static void batadv_tt_purge(struct work_struct *work); static void batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry); static void batadv_tt_global_del(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *addr, const char *message, bool roaming); /* returns 1 if they are the same mac addr */ static int batadv_compare_tt(const struct hlist_node *node, const void *data2) { const void *data1 = container_of(node, struct batadv_tt_common_entry, hash_entry); return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); } static struct batadv_tt_common_entry * batadv_tt_hash_find(struct batadv_hashtable *hash, const void *data) { struct hlist_head *head; struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_common_entry *tt_common_entry_tmp = NULL; uint32_t index; if (!hash) return NULL; index = batadv_choose_orig(data, hash->size); head = &hash->table[index]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { if (!batadv_compare_eth(tt_common_entry, data)) continue; if (!atomic_inc_not_zero(&tt_common_entry->refcount)) continue; tt_common_entry_tmp = tt_common_entry; break; } rcu_read_unlock(); return tt_common_entry_tmp; } static struct batadv_tt_local_entry * batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const void *data) { struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local_entry = NULL; tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, data); if (tt_common_entry) tt_local_entry = container_of(tt_common_entry, struct batadv_tt_local_entry, common); return tt_local_entry; } static struct batadv_tt_global_entry * batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const void *data) { struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global_entry = NULL; tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, data); if (tt_common_entry) tt_global_entry = container_of(tt_common_entry, struct batadv_tt_global_entry, common); return tt_global_entry; } static void batadv_tt_local_entry_free_ref(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); } static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu) { struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global_entry; tt_common_entry = container_of(rcu, struct batadv_tt_common_entry, rcu); tt_global_entry = container_of(tt_common_entry, struct batadv_tt_global_entry, common); kfree(tt_global_entry); } static void batadv_tt_global_entry_free_ref(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); call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu); } } static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu) { struct batadv_tt_orig_list_entry *orig_entry; orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu); /* We are in an rcu callback here, therefore we cannot use * batadv_orig_node_free_ref() and its call_rcu(): * An rcu_barrier() wouldn't wait for that to finish */ batadv_orig_node_free_ref_now(orig_entry->orig_node); kfree(orig_entry); } static void batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry) { if (!atomic_dec_and_test(&orig_entry->refcount)) return; /* to avoid race conditions, immediately decrease the tt counter */ atomic_dec(&orig_entry->orig_node->tt_size); call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu); } /** * batadv_tt_local_event - store a local TT event (ADD/DEL) * @bat_priv: the bat priv with all the soft interface information * @tt_local_entry: the TT entry involved in the event * @event_flags: flags to store in the event structure */ static void batadv_tt_local_event(struct batadv_priv *bat_priv, struct batadv_tt_local_entry *tt_local_entry, uint8_t event_flags) { struct batadv_tt_change_node *tt_change_node, *entry, *safe; struct batadv_tt_common_entry *common = &tt_local_entry->common; uint8_t flags = common->flags | event_flags; bool event_removed = false; bool del_op_requested, del_op_entry; tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC); if (!tt_change_node) return; tt_change_node->change.flags = flags; memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN); del_op_requested = flags & BATADV_TT_CLIENT_DEL; /* check for ADD+DEL or DEL+ADD events */ spin_lock_bh(&bat_priv->tt.changes_list_lock); list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, list) { if (!batadv_compare_eth(entry->change.addr, common->addr)) continue; /* DEL+ADD in the same orig interval have no effect and can be * removed to avoid silly behaviour on the receiver side. The * other way around (ADD+DEL) can happen in case of roaming of * a client still in the NEW state. Roaming of NEW clients is * now possible due to automatically recognition of "temporary" * clients */ del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL; if (!del_op_requested && del_op_entry) goto del; if (del_op_requested && !del_op_entry) goto del; continue; del: list_del(&entry->list); kfree(entry); kfree(tt_change_node); event_removed = true; goto unlock; } /* track the change in the OGMinterval list */ list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list); unlock: spin_unlock_bh(&bat_priv->tt.changes_list_lock); if (event_removed) atomic_dec(&bat_priv->tt.local_changes); else atomic_inc(&bat_priv->tt.local_changes); } int batadv_tt_len(int changes_num) { return changes_num * sizeof(struct batadv_tt_change); } static int batadv_tt_local_init(struct batadv_priv *bat_priv) { if (bat_priv->tt.local_hash) return 0; bat_priv->tt.local_hash = batadv_hash_new(1024); if (!bat_priv->tt.local_hash) return -ENOMEM; batadv_hash_set_lock_class(bat_priv->tt.local_hash, &batadv_tt_local_hash_lock_class_key); return 0; } static void batadv_tt_global_free(struct batadv_priv *bat_priv, struct batadv_tt_global_entry *tt_global, const char *message) { batadv_dbg(BATADV_DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", tt_global->common.addr, message); batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt, batadv_choose_orig, tt_global->common.addr); batadv_tt_global_entry_free_ref(tt_global); } void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, int ifindex) { struct batadv_priv *bat_priv = netdev_priv(soft_iface); struct batadv_tt_local_entry *tt_local; 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; tt_local = batadv_tt_local_hash_find(bat_priv, addr); tt_global = batadv_tt_global_hash_find(bat_priv, addr); if (tt_local) { tt_local->last_seen = jiffies; if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) { batadv_dbg(BATADV_DBG_TT, bat_priv, "Re-adding pending client %pM\n", addr); /* whatever the reason why the PENDING flag was set, * this is a client which was enqueued to be removed in * this orig_interval. Since it popped up again, the * flag can be reset like it was never enqueued */ tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING; goto add_event; } if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) { batadv_dbg(BATADV_DBG_TT, bat_priv, "Roaming client %pM came back to its original location\n", addr); /* the ROAM flag is set because this client roamed away * and the node got a roaming_advertisement message. Now * that the client popped up again at its original * location such flag can be unset */ tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM; roamed_back = true; } goto check_roaming; } tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC); if (!tt_local) goto out; batadv_dbg(BATADV_DBG_TT, bat_priv, "Creating new local tt entry: %pM (ttvn: %d)\n", addr, (uint8_t)atomic_read(&bat_priv->tt.vn)); memcpy(tt_local->common.addr, addr, ETH_ALEN); /* The local entry has to be marked as NEW to avoid to send it in * a full table response going out before the next ttvn increment * (consistency check) */ tt_local->common.flags = BATADV_TT_CLIENT_NEW; if (batadv_is_wifi_iface(ifindex)) tt_local->common.flags |= BATADV_TT_CLIENT_WIFI; atomic_set(&tt_local->common.refcount, 2); tt_local->last_seen = jiffies; tt_local->common.added_at = tt_local->last_seen; /* the batman interface mac address should never be purged */ if (batadv_compare_eth(addr, soft_iface->dev_addr)) tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, batadv_choose_orig, &tt_local->common, &tt_local->common.hash_entry); if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ batadv_tt_local_entry_free_ref(tt_local); goto out; } add_event: batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS); check_roaming: /* Check whether it is a roaming, but don't do anything if the roaming * process has already been handled */ if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) { /* These node are probably going to update their tt table */ head = &tt_global->orig_list; rcu_read_lock(); hlist_for_each_entry_rcu(orig_entry, head, list) { batadv_send_roam_adv(bat_priv, tt_global->common.addr, orig_entry->orig_node); } rcu_read_unlock(); if (roamed_back) { batadv_tt_global_free(bat_priv, tt_global, "Roaming canceled"); tt_global = NULL; } else { /* The global entry has to be marked as ROAMING and * has to be kept for consistency purpose */ tt_global->common.flags |= BATADV_TT_CLIENT_ROAM; tt_global->roam_at = jiffies; } } out: if (tt_local) batadv_tt_local_entry_free_ref(tt_local); if (tt_global) batadv_tt_global_entry_free_ref(tt_global); } static void batadv_tt_realloc_packet_buff(unsigned char **packet_buff, int *packet_buff_len, int min_packet_len, int new_packet_len) { unsigned char *new_buff; new_buff = kmalloc(new_packet_len, GFP_ATOMIC); /* keep old buffer if kmalloc should fail */ if (new_buff) { memcpy(new_buff, *packet_buff, min_packet_len); kfree(*packet_buff); *packet_buff = new_buff; *packet_buff_len = new_packet_len; } } static void batadv_tt_prepare_packet_buff(struct batadv_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int min_packet_len) { int req_len; req_len = min_packet_len; req_len += batadv_tt_len(atomic_read(&bat_priv->tt.local_changes)); /* if we have too many changes for one packet don't send any * and wait for the tt table request which will be fragmented */ if (req_len > bat_priv->soft_iface->mtu) req_len = min_packet_len; batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, min_packet_len, req_len); } static int batadv_tt_changes_fill_buff(struct batadv_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int min_packet_len) { struct batadv_tt_change_node *entry, *safe; int count = 0, tot_changes = 0, new_len; unsigned char *tt_buff; batadv_tt_prepare_packet_buff(bat_priv, packet_buff, packet_buff_len, min_packet_len); new_len = *packet_buff_len - min_packet_len; tt_buff = *packet_buff + min_packet_len; if (new_len > 0) tot_changes = new_len / batadv_tt_len(1); spin_lock_bh(&bat_priv->tt.changes_list_lock); atomic_set(&bat_priv->tt.local_changes, 0); list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, list) { if (count < tot_changes) { memcpy(tt_buff + batadv_tt_len(count), &entry->change, sizeof(struct batadv_tt_change)); count++; } list_del(&entry->list); kfree(entry); } spin_unlock_bh(&bat_priv->tt.changes_list_lock); /* Keep the buffer for possible tt_request */ spin_lock_bh(&bat_priv->tt.last_changeset_lock); kfree(bat_priv->tt.last_changeset); bat_priv->tt.last_changeset_len = 0; bat_priv->tt.last_changeset = NULL; /* check whether this new OGM has no changes due to size problems */ if (new_len > 0) { /* if kmalloc() fails we will reply with the full table * instead of providing the diff */ bat_priv->tt.last_changeset = kmalloc(new_len, GFP_ATOMIC); if (bat_priv->tt.last_changeset) { memcpy(bat_priv->tt.last_changeset, tt_buff, new_len); bat_priv->tt.last_changeset_len = new_len; } } spin_unlock_bh(&bat_priv->tt.last_changeset_lock); return count; } int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; struct batadv_hard_iface *primary_if; struct hlist_head *head; uint32_t i; int last_seen_secs; int last_seen_msecs; unsigned long last_seen_jiffies; bool no_purge; uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE; primary_if = batadv_seq_print_text_primary_if_get(seq); if (!primary_if) goto out; seq_printf(seq, "Locally retrieved addresses (from %s) announced via TT (TTVN: %u CRC: %#.4x):\n", net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn), bat_priv->tt.local_crc); seq_printf(seq, " %-13s %-7s %-10s\n", "Client", "Flags", "Last seen"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { tt_local = container_of(tt_common_entry, struct batadv_tt_local_entry, common); last_seen_jiffies = jiffies - tt_local->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; no_purge = tt_common_entry->flags & np_flag; seq_printf(seq, " * %pM [%c%c%c%c%c] %3u.%03u\n", tt_common_entry->addr, (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), no_purge ? 'P' : '.', (tt_common_entry->flags & BATADV_TT_CLIENT_NEW ? 'N' : '.'), (tt_common_entry->flags & BATADV_TT_CLIENT_PENDING ? 'X' : '.'), (tt_common_entry->flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), no_purge ? 0 : last_seen_secs, no_purge ? 0 : last_seen_msecs); } rcu_read_unlock(); } out: if (primary_if) batadv_hardif_free_ref(primary_if); return 0; } static void batadv_tt_local_set_pending(struct batadv_priv *bat_priv, struct batadv_tt_local_entry *tt_local_entry, uint16_t flags, const char *message) { batadv_tt_local_event(bat_priv, tt_local_entry, flags); /* The local client has to be marked as "pending to be removed" but has * to be kept in the table in order to send it in a full table * response issued before the net ttvn increment (consistency check) */ tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING; batadv_dbg(BATADV_DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: %s\n", tt_local_entry->common.addr, message); } /** * batadv_tt_local_remove - logically remove an entry from the local table * @bat_priv: the bat priv with all the soft interface information * @addr: the MAC address of the client to remove * @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 */ uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv, const uint8_t *addr, const char *message, bool roaming) { struct batadv_tt_local_entry *tt_local_entry; uint16_t flags, curr_flags = BATADV_NO_FLAGS; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); if (!tt_local_entry) goto out; curr_flags = tt_local_entry->common.flags; flags = BATADV_TT_CLIENT_DEL; /* if this global entry addition is due to a roaming, the node has to * mark the local entry as "roamed" in order to correctly reroute * packets later */ if (roaming) { flags |= BATADV_TT_CLIENT_ROAM; /* mark the local client as ROAMed */ tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM; } if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) { batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags, message); goto out; } /* if this client has been added right now, it is possible to * immediately purge it */ batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL); hlist_del_rcu(&tt_local_entry->common.hash_entry); batadv_tt_local_entry_free_ref(tt_local_entry); out: if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return curr_flags; } static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, struct hlist_head *head) { struct batadv_tt_local_entry *tt_local_entry; struct batadv_tt_common_entry *tt_common_entry; struct hlist_node *node_tmp; hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, hash_entry) { tt_local_entry = container_of(tt_common_entry, struct batadv_tt_local_entry, common); if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE) continue; /* entry already marked for deletion */ 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)) continue; batadv_tt_local_set_pending(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL, "timed out"); } } static void batadv_tt_local_purge(struct batadv_priv *bat_priv) { struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ uint32_t i; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); batadv_tt_local_purge_list(bat_priv, head); spin_unlock_bh(list_lock); } } static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) { struct batadv_hashtable *hash; 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 hlist_node *node_tmp; struct hlist_head *head; uint32_t i; if (!bat_priv->tt.local_hash) return; hash = bat_priv->tt.local_hash; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, hash_entry) { hlist_del_rcu(&tt_common_entry->hash_entry); tt_local = container_of(tt_common_entry, struct batadv_tt_local_entry, common); batadv_tt_local_entry_free_ref(tt_local); } spin_unlock_bh(list_lock); } batadv_hash_destroy(hash); bat_priv->tt.local_hash = NULL; } static int batadv_tt_global_init(struct batadv_priv *bat_priv) { if (bat_priv->tt.global_hash) return 0; bat_priv->tt.global_hash = batadv_hash_new(1024); if (!bat_priv->tt.global_hash) return -ENOMEM; batadv_hash_set_lock_class(bat_priv->tt.global_hash, &batadv_tt_global_hash_lock_class_key); return 0; } static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv) { struct batadv_tt_change_node *entry, *safe; spin_lock_bh(&bat_priv->tt.changes_list_lock); list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list, list) { list_del(&entry->list); kfree(entry); } atomic_set(&bat_priv->tt.local_changes, 0); spin_unlock_bh(&bat_priv->tt.changes_list_lock); } /* retrieves 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 */ static struct batadv_tt_orig_list_entry * batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry, const struct batadv_orig_node *orig_node) { struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL; const struct hlist_head *head; rcu_read_lock(); head = &entry->orig_list; 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)) continue; orig_entry = tmp_orig_entry; break; } rcu_read_unlock(); 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 */ static bool batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry, const struct batadv_orig_node *orig_node) { struct batadv_tt_orig_list_entry *orig_entry; bool found = false; 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); } return found; } static void batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global, struct batadv_orig_node *orig_node, int ttvn) { struct batadv_tt_orig_list_entry *orig_entry; orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node); if (orig_entry) { /* refresh the ttvn: the current value could be a bogus one that * was added during a "temporary client detection" */ orig_entry->ttvn = ttvn; goto out; } orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); if (!orig_entry) goto out; INIT_HLIST_NODE(&orig_entry->list); atomic_inc(&orig_node->refcount); atomic_inc(&orig_node->tt_size); orig_entry->orig_node = orig_node; orig_entry->ttvn = ttvn; atomic_set(&orig_entry->refcount, 2); spin_lock_bh(&tt_global->list_lock); hlist_add_head_rcu(&orig_entry->list, &tt_global->orig_list); spin_unlock_bh(&tt_global->list_lock); out: if (orig_entry) batadv_tt_orig_list_entry_free_ref(orig_entry); } /** * batadv_tt_global_add - add a new TT global entry or update an existing one * @bat_priv: the bat priv with all the soft interface information * @orig_node: the originator announcing the client * @tt_addr: the mac address of the non-mesh client * @flags: TT flags that have to be set for this non-mesh client * @ttvn: the tt version number ever announcing this non-mesh client * * Add a new TT global entry for the given originator. If the entry already * exists add a new reference to the given originator (a global entry can have * references to multiple originators) and adjust the flags attribute to reflect * the function argument. * If a TT local entry exists for this non-mesh client remove it. * * The caller must hold orig_node refcount. */ int batadv_tt_global_add(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *tt_addr, uint16_t flags, uint8_t ttvn) { struct batadv_tt_global_entry *tt_global_entry; struct batadv_tt_local_entry *tt_local_entry; int ret = 0; int hash_added; struct batadv_tt_common_entry *common; uint16_t local_flags; tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr); /* if the node already has a local client for this entry, it has to wait * for a roaming advertisement instead of manually messing up the global * table */ if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry && !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) goto out; if (!tt_global_entry) { tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC); if (!tt_global_entry) goto out; common = &tt_global_entry->common; memcpy(common->addr, tt_addr, ETH_ALEN); common->flags = flags; tt_global_entry->roam_at = 0; /* node must store current time in case of roaming. This is * needed to purge this entry out on timeout (if nobody claims * it) */ if (flags & BATADV_TT_CLIENT_ROAM) tt_global_entry->roam_at = jiffies; atomic_set(&common->refcount, 2); common->added_at = jiffies; INIT_HLIST_HEAD(&tt_global_entry->orig_list); spin_lock_init(&tt_global_entry->list_lock); hash_added = batadv_hash_add(bat_priv->tt.global_hash, batadv_compare_tt, batadv_choose_orig, common, &common->hash_entry); if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ batadv_tt_global_entry_free_ref(tt_global_entry); goto out_remove; } } else { common = &tt_global_entry->common; /* If there is already a global entry, we can use this one for * our processing. * But if we are trying to add a temporary client then here are * two options at this point: * 1) the global client is not a temporary client: the global * client has to be left as it is, temporary information * should never override any already known client state * 2) the global client is a temporary client: purge the * originator list and add the new one orig_entry */ if (flags & BATADV_TT_CLIENT_TEMP) { if (!(common->flags & BATADV_TT_CLIENT_TEMP)) goto out; if (batadv_tt_global_entry_has_orig(tt_global_entry, orig_node)) goto out_remove; batadv_tt_global_del_orig_list(tt_global_entry); goto add_orig_entry; } /* if the client was temporary added before receiving the first * OGM announcing it, we have to clear the TEMP flag */ common->flags &= ~BATADV_TT_CLIENT_TEMP; /* the change can carry possible "attribute" flags like the * TT_CLIENT_WIFI, therefore they have to be copied in the * client entry */ tt_global_entry->common.flags |= flags; /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only * one originator left in the list and we previously received a * delete + roaming change for this originator. * * We should first delete the old originator before adding the * new one. */ if (common->flags & BATADV_TT_CLIENT_ROAM) { batadv_tt_global_del_orig_list(tt_global_entry); common->flags &= ~BATADV_TT_CLIENT_ROAM; tt_global_entry->roam_at = 0; } } add_orig_entry: /* add the new orig_entry (if needed) or update it */ batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn); batadv_dbg(BATADV_DBG_TT, bat_priv, "Creating new global tt entry: %pM (via %pM)\n", common->addr, orig_node->orig); ret = 1; out_remove: /* remove address from local hash if present */ local_flags = batadv_tt_local_remove(bat_priv, tt_addr, "global tt received", flags & BATADV_TT_CLIENT_ROAM); tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI; if (!(flags & BATADV_TT_CLIENT_ROAM)) /* this is a normal global add. Therefore the client is not in a * roaming state anymore. */ tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM; out: if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return ret; } /* batadv_transtable_best_orig - Get best originator list entry from tt entry * @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. */ static struct batadv_tt_orig_list_entry * batadv_transtable_best_orig(struct batadv_tt_global_entry *tt_global_entry) { struct batadv_neigh_node *router = NULL; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL; int best_tq = 0; head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, head, list) { router = batadv_orig_node_get_router(orig_entry->orig_node); if (!router) continue; if (router->tq_avg > best_tq) { best_entry = orig_entry; best_tq = router->tq_avg; } batadv_neigh_node_free_ref(router); } return best_entry; } /* batadv_tt_global_print_entry - print all orig nodes who announce the address * for this global entry * @tt_global_entry: global translation table entry to be printed * @seq: debugfs table seq_file struct * * This functon assumes the caller holds rcu_read_lock(). */ static void batadv_tt_global_print_entry(struct batadv_tt_global_entry *tt_global_entry, struct seq_file *seq) { struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry, *best_entry; struct batadv_tt_common_entry *tt_common_entry; uint16_t flags; uint8_t last_ttvn; tt_common_entry = &tt_global_entry->common; flags = tt_common_entry->flags; best_entry = batadv_transtable_best_orig(tt_global_entry); if (best_entry) { last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn); seq_printf(seq, " %c %pM (%3u) via %pM (%3u) (%#.4x) [%c%c%c]\n", '*', tt_global_entry->common.addr, best_entry->ttvn, best_entry->orig_node->orig, last_ttvn, best_entry->orig_node->tt_crc, (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); } head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, head, list) { if (best_entry == orig_entry) continue; last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); seq_printf(seq, " %c %pM (%3u) via %pM (%3u) [%c%c%c]\n", '+', tt_global_entry->common.addr, orig_entry->ttvn, orig_entry->orig_node->orig, last_ttvn, (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'), (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'), (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.')); } } int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); struct batadv_hashtable *hash = bat_priv->tt.global_hash; struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global; struct batadv_hard_iface *primary_if; struct hlist_head *head; uint32_t i; primary_if = batadv_seq_print_text_primary_if_get(seq); if (!primary_if) goto out; seq_printf(seq, "Globally announced TT entries received via the mesh %s\n", net_dev->name); seq_printf(seq, " %-13s %s %-15s %s (%-6s) %s\n", "Client", "(TTVN)", "Originator", "(Curr TTVN)", "CRC", "Flags"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); batadv_tt_global_print_entry(tt_global, seq); } rcu_read_unlock(); } out: if (primary_if) batadv_hardif_free_ref(primary_if); return 0; } /* deletes the orig list of a tt_global_entry */ static void batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry) { struct hlist_head *head; struct hlist_node *safe; struct batadv_tt_orig_list_entry *orig_entry; spin_lock_bh(&tt_global_entry->list_lock); head = &tt_global_entry->orig_list; hlist_for_each_entry_safe(orig_entry, safe, head, list) { hlist_del_rcu(&orig_entry->list); batadv_tt_orig_list_entry_free_ref(orig_entry); } spin_unlock_bh(&tt_global_entry->list_lock); } static void batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv, struct batadv_tt_global_entry *tt_global_entry, struct batadv_orig_node *orig_node, const char *message) { struct hlist_head *head; struct hlist_node *safe; struct batadv_tt_orig_list_entry *orig_entry; spin_lock_bh(&tt_global_entry->list_lock); head = &tt_global_entry->orig_list; hlist_for_each_entry_safe(orig_entry, safe, head, list) { if (orig_entry->orig_node == orig_node) { batadv_dbg(BATADV_DBG_TT, bat_priv, "Deleting %pM from global tt entry %pM: %s\n", orig_node->orig, tt_global_entry->common.addr, message); hlist_del_rcu(&orig_entry->list); batadv_tt_orig_list_entry_free_ref(orig_entry); } } spin_unlock_bh(&tt_global_entry->list_lock); } /* If the client is to be deleted, we check if it is the last origantor entry * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the * timer, otherwise we simply remove the originator scheduled for deletion. */ static void batadv_tt_global_del_roaming(struct batadv_priv *bat_priv, struct batadv_tt_global_entry *tt_global_entry, struct batadv_orig_node *orig_node, const char *message) { bool last_entry = true; struct hlist_head *head; struct batadv_tt_orig_list_entry *orig_entry; /* no local entry exists, case 1: * Check if this is the last one or if other entries exist. */ rcu_read_lock(); head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, head, list) { if (orig_entry->orig_node != orig_node) { last_entry = false; break; } } rcu_read_unlock(); if (last_entry) { /* its the last one, mark for roaming. */ tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM; tt_global_entry->roam_at = jiffies; } else /* there is another entry, we can simply delete this * one and can still use the other one. */ batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node, message); } static void batadv_tt_global_del(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *addr, const char *message, bool roaming) { struct batadv_tt_global_entry *tt_global_entry; struct batadv_tt_local_entry *local_entry = NULL; tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); if (!tt_global_entry) goto out; if (!roaming) { batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node, message); if (hlist_empty(&tt_global_entry->orig_list)) batadv_tt_global_free(bat_priv, tt_global_entry, message); goto out; } /* if we are deleting a global entry due to a roam * event, there are two possibilities: * 1) the client roamed from node A to node B => if there * is only one originator left for this client, we mark * it with BATADV_TT_CLIENT_ROAM, we start a timer and we * wait for node B to claim it. In case of timeout * the entry is purged. * * If there are other originators left, we directly delete * the originator. * 2) the client roamed to us => we can directly delete * the global entry, since it is useless now. */ local_entry = batadv_tt_local_hash_find(bat_priv, tt_global_entry->common.addr); if (local_entry) { /* local entry exists, case 2: client roamed to us. */ batadv_tt_global_del_orig_list(tt_global_entry); batadv_tt_global_free(bat_priv, tt_global_entry, message); } else /* no local entry exists, case 1: check for roaming */ batadv_tt_global_del_roaming(bat_priv, tt_global_entry, orig_node, message); out: if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); if (local_entry) batadv_tt_local_entry_free_ref(local_entry); } void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const char *message) { struct batadv_tt_global_entry *tt_global; struct batadv_tt_common_entry *tt_common_entry; uint32_t i; struct batadv_hashtable *hash = bat_priv->tt.global_hash; struct hlist_node *safe; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ if (!hash) return; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, safe, head, hash_entry) { tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); batadv_tt_global_del_orig_entry(bat_priv, tt_global, orig_node, message); if (hlist_empty(&tt_global->orig_list)) { batadv_dbg(BATADV_DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", tt_global->common.addr, message); hlist_del_rcu(&tt_common_entry->hash_entry); batadv_tt_global_entry_free_ref(tt_global); } } spin_unlock_bh(list_lock); } orig_node->tt_initialised = false; } static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, char **msg) { bool purge = false; unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT; unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT; if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) && batadv_has_timed_out(tt_global->roam_at, roam_timeout)) { purge = true; *msg = "Roaming timeout\n"; } if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) && batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) { purge = true; *msg = "Temporary client timeout\n"; } return purge; } static void batadv_tt_global_purge(struct batadv_priv *bat_priv) { struct batadv_hashtable *hash = bat_priv->tt.global_hash; struct hlist_head *head; struct hlist_node *node_tmp; spinlock_t *list_lock; /* protects write access to the hash lists */ uint32_t i; char *msg = NULL; struct batadv_tt_common_entry *tt_common; struct batadv_tt_global_entry *tt_global; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common, node_tmp, head, hash_entry) { tt_global = container_of(tt_common, struct batadv_tt_global_entry, common); if (!batadv_tt_global_to_purge(tt_global, &msg)) continue; batadv_dbg(BATADV_DBG_TT, bat_priv, "Deleting global tt entry (%pM): %s\n", tt_global->common.addr, msg); hlist_del_rcu(&tt_common->hash_entry); batadv_tt_global_entry_free_ref(tt_global); } spin_unlock_bh(list_lock); } } static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) { struct batadv_hashtable *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global; struct hlist_node *node_tmp; struct hlist_head *head; uint32_t i; if (!bat_priv->tt.global_hash) return; hash = bat_priv->tt.global_hash; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, node_tmp, head, hash_entry) { hlist_del_rcu(&tt_common_entry->hash_entry); tt_global = container_of(tt_common_entry, struct batadv_tt_global_entry, common); batadv_tt_global_entry_free_ref(tt_global); } spin_unlock_bh(list_lock); } batadv_hash_destroy(hash); bat_priv->tt.global_hash = NULL; } static bool _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry, struct batadv_tt_global_entry *tt_global_entry) { bool ret = false; if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI && tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI) ret = true; return ret; } struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv, const uint8_t *src, const uint8_t *addr) { struct batadv_tt_local_entry *tt_local_entry = NULL; struct batadv_tt_global_entry *tt_global_entry = NULL; struct batadv_orig_node *orig_node = NULL; struct batadv_tt_orig_list_entry *best_entry; if (src && atomic_read(&bat_priv->ap_isolation)) { tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); if (!tt_local_entry || (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)) goto out; } tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); if (!tt_global_entry) goto out; /* check whether the clients should not communicate due to AP * isolation */ if (tt_local_entry && _batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) goto out; rcu_read_lock(); best_entry = batadv_transtable_best_orig(tt_global_entry); /* found anything? */ if (best_entry) orig_node = best_entry->orig_node; if (orig_node && !atomic_inc_not_zero(&orig_node->refcount)) orig_node = NULL; rcu_read_unlock(); out: if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return orig_node; } /* Calculates the checksum of the local table of a given orig_node */ static uint16_t batadv_tt_global_crc(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) { uint16_t total = 0, total_one; struct batadv_hashtable *hash = bat_priv->tt.global_hash; struct batadv_tt_common_entry *tt_common; struct batadv_tt_global_entry *tt_global; struct hlist_head *head; uint32_t i; int j; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common, head, hash_entry) { tt_global = container_of(tt_common, struct batadv_tt_global_entry, common); /* Roaming clients are in the global table for * consistency only. They don't have to be * taken into account while computing the * global crc */ if (tt_common->flags & BATADV_TT_CLIENT_ROAM) continue; /* Temporary clients have not been announced yet, so * they have to be skipped while computing the global * crc */ if (tt_common->flags & BATADV_TT_CLIENT_TEMP) continue; /* find out if this global entry is announced by this * originator */ if (!batadv_tt_global_entry_has_orig(tt_global, orig_node)) continue; total_one = 0; for (j = 0; j < ETH_ALEN; j++) total_one = crc16_byte(total_one, tt_common->addr[j]); total ^= total_one; } rcu_read_unlock(); } return total; } /* Calculates the checksum of the local table */ static uint16_t batadv_tt_local_crc(struct batadv_priv *bat_priv) { uint16_t total = 0, total_one; struct batadv_hashtable *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common; struct hlist_head *head; uint32_t i; int j; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common, head, hash_entry) { /* not yet committed clients have not to be taken into * account while computing the CRC */ if (tt_common->flags & BATADV_TT_CLIENT_NEW) continue; total_one = 0; for (j = 0; j < ETH_ALEN; j++) total_one = crc16_byte(total_one, tt_common->addr[j]); total ^= total_one; } rcu_read_unlock(); } return total; } static void batadv_tt_req_list_free(struct batadv_priv *bat_priv) { struct batadv_tt_req_node *node, *safe; spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { list_del(&node->list); kfree(node); } spin_unlock_bh(&bat_priv->tt.req_list_lock); } static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *tt_buff, uint8_t tt_num_changes) { uint16_t tt_buff_len = batadv_tt_len(tt_num_changes); /* Replace the old buffer only if I received something in the * last OGM (the OGM could carry no changes) */ spin_lock_bh(&orig_node->tt_buff_lock); if (tt_buff_len > 0) { kfree(orig_node->tt_buff); orig_node->tt_buff_len = 0; orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC); if (orig_node->tt_buff) { memcpy(orig_node->tt_buff, tt_buff, tt_buff_len); orig_node->tt_buff_len = tt_buff_len; } } spin_unlock_bh(&orig_node->tt_buff_lock); } static void batadv_tt_req_purge(struct batadv_priv *bat_priv) { struct batadv_tt_req_node *node, *safe; spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (batadv_has_timed_out(node->issued_at, BATADV_TT_REQUEST_TIMEOUT)) { list_del(&node->list); kfree(node); } } spin_unlock_bh(&bat_priv->tt.req_list_lock); } /* returns 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 * batadv_new_tt_req_node(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node) { struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL; spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) { if (batadv_compare_eth(tt_req_node_tmp, orig_node) && !batadv_has_timed_out(tt_req_node_tmp->issued_at, BATADV_TT_REQUEST_TIMEOUT)) goto unlock; } tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC); if (!tt_req_node) goto unlock; memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN); tt_req_node->issued_at = jiffies; list_add(&tt_req_node->list, &bat_priv->tt.req_list); unlock: spin_unlock_bh(&bat_priv->tt.req_list_lock); return tt_req_node; } /* data_ptr is useless here, but has to be kept to respect the prototype */ static int batadv_tt_local_valid_entry(const void *entry_ptr, const void *data_ptr) { const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW) return 0; return 1; } static int batadv_tt_global_valid(const void *entry_ptr, const void *data_ptr) { const struct batadv_tt_common_entry *tt_common_entry = entry_ptr; const struct batadv_tt_global_entry *tt_global_entry; const struct batadv_orig_node *orig_node = data_ptr; if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM || tt_common_entry->flags & BATADV_TT_CLIENT_TEMP) return 0; tt_global_entry = container_of(tt_common_entry, struct batadv_tt_global_entry, common); return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node); } static struct sk_buff * batadv_tt_response_fill_table(uint16_t tt_len, uint8_t ttvn, struct batadv_hashtable *hash, struct batadv_priv *bat_priv, int (*valid_cb)(const void *, const void *), void *cb_data) { struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_query_packet *tt_response; struct batadv_tt_change *tt_change; struct hlist_head *head; struct sk_buff *skb = NULL; uint16_t tt_tot, tt_count; ssize_t tt_query_size = sizeof(struct batadv_tt_query_packet); uint32_t i; size_t len; if (tt_query_size + tt_len > bat_priv->soft_iface->mtu) { tt_len = bat_priv->soft_iface->mtu - tt_query_size; tt_len -= tt_len % sizeof(struct batadv_tt_change); } tt_tot = tt_len / sizeof(struct batadv_tt_change); len = tt_query_size + tt_len; skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN); if (!skb) goto out; skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); tt_response = (struct batadv_tt_query_packet *)skb_put(skb, len); tt_response->ttvn = ttvn; tt_change = (struct batadv_tt_change *)(skb->data + tt_query_size); tt_count = 0; rcu_read_lock(); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { if (tt_count == tt_tot) break; if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data))) continue; memcpy(tt_change->addr, tt_common_entry->addr, ETH_ALEN); tt_change->flags = tt_common_entry->flags; tt_count++; tt_change++; } } rcu_read_unlock(); /* store in the message the number of entries we have successfully * copied */ tt_response->tt_data = htons(tt_count); out: return skb; } static int batadv_send_tt_request(struct batadv_priv *bat_priv, struct batadv_orig_node *dst_orig_node, uint8_t ttvn, uint16_t tt_crc, bool full_table) { struct sk_buff *skb = NULL; struct batadv_tt_query_packet *tt_request; struct batadv_hard_iface *primary_if; struct batadv_tt_req_node *tt_req_node = NULL; int ret = 1; size_t tt_req_len; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* The new tt_req will be issued only if I'm not waiting for a * reply from the same orig_node yet */ tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node); if (!tt_req_node) goto out; skb = netdev_alloc_skb_ip_align(NULL, sizeof(*tt_request) + ETH_HLEN); if (!skb) goto out; skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); tt_req_len = sizeof(*tt_request); tt_request = (struct batadv_tt_query_packet *)skb_put(skb, tt_req_len); tt_request->header.packet_type = BATADV_TT_QUERY; tt_request->header.version = BATADV_COMPAT_VERSION; memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN); memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN); tt_request->header.ttl = BATADV_TTL; tt_request->ttvn = ttvn; tt_request->tt_data = htons(tt_crc); tt_request->flags = BATADV_TT_REQUEST; if (full_table) tt_request->flags |= BATADV_TT_FULL_TABLE; batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n", dst_orig_node->orig, (full_table ? 'F' : '.')); batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX); if (batadv_send_skb_to_orig(skb, dst_orig_node, NULL) != NET_XMIT_DROP) ret = 0; out: if (primary_if) batadv_hardif_free_ref(primary_if); if (ret) kfree_skb(skb); if (ret && tt_req_node) { spin_lock_bh(&bat_priv->tt.req_list_lock); list_del(&tt_req_node->list); spin_unlock_bh(&bat_priv->tt.req_list_lock); kfree(tt_req_node); } return ret; } static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, struct batadv_tt_query_packet *tt_request) { struct batadv_orig_node *req_dst_orig_node; struct batadv_orig_node *res_dst_orig_node = NULL; uint8_t orig_ttvn, req_ttvn, ttvn; int res, ret = false; unsigned char *tt_buff; bool full_table; uint16_t tt_len, tt_tot; struct sk_buff *skb = NULL; struct batadv_tt_query_packet *tt_response; uint8_t *packet_pos; size_t len; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n", tt_request->src, tt_request->ttvn, tt_request->dst, (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); /* Let's get the orig node of the REAL destination */ req_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->dst); if (!req_dst_orig_node) goto out; res_dst_orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); if (!res_dst_orig_node) goto out; orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); req_ttvn = tt_request->ttvn; /* I don't have the requested data */ if (orig_ttvn != req_ttvn || tt_request->tt_data != htons(req_dst_orig_node->tt_crc)) goto out; /* If the full table has been explicitly requested */ if (tt_request->flags & BATADV_TT_FULL_TABLE || !req_dst_orig_node->tt_buff) full_table = true; else full_table = false; /* In this version, fragmentation is not implemented, then * I'll send only one packet with as much TT entries as I can */ if (!full_table) { spin_lock_bh(&req_dst_orig_node->tt_buff_lock); tt_len = req_dst_orig_node->tt_buff_len; tt_tot = tt_len / sizeof(struct batadv_tt_change); len = sizeof(*tt_response) + tt_len; skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN); if (!skb) goto unlock; skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); packet_pos = skb_put(skb, len); tt_response = (struct batadv_tt_query_packet *)packet_pos; tt_response->ttvn = req_ttvn; tt_response->tt_data = htons(tt_tot); tt_buff = skb->data + sizeof(*tt_response); /* Copy the last orig_node's OGM buffer */ memcpy(tt_buff, req_dst_orig_node->tt_buff, req_dst_orig_node->tt_buff_len); spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); } else { tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size); tt_len *= sizeof(struct batadv_tt_change); ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn); skb = batadv_tt_response_fill_table(tt_len, ttvn, bat_priv->tt.global_hash, bat_priv, batadv_tt_global_valid, req_dst_orig_node); if (!skb) goto out; tt_response = (struct batadv_tt_query_packet *)skb->data; } tt_response->header.packet_type = BATADV_TT_QUERY; tt_response->header.version = BATADV_COMPAT_VERSION; tt_response->header.ttl = BATADV_TTL; memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); memcpy(tt_response->dst, tt_request->src, ETH_ALEN); tt_response->flags = BATADV_TT_RESPONSE; if (full_table) tt_response->flags |= BATADV_TT_FULL_TABLE; batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_RESPONSE %pM for %pM (ttvn: %u)\n", res_dst_orig_node->orig, req_dst_orig_node->orig, req_ttvn); batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); res = batadv_send_skb_to_orig(skb, res_dst_orig_node, NULL); if (res != NET_XMIT_DROP) ret = true; goto out; unlock: spin_unlock_bh(&req_dst_orig_node->tt_buff_lock); out: if (res_dst_orig_node) batadv_orig_node_free_ref(res_dst_orig_node); if (req_dst_orig_node) batadv_orig_node_free_ref(req_dst_orig_node); if (!ret) kfree_skb(skb); return ret; } static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, struct batadv_tt_query_packet *tt_request) { struct batadv_orig_node *orig_node; struct batadv_hard_iface *primary_if = NULL; uint8_t my_ttvn, req_ttvn, ttvn; int ret = false; unsigned char *tt_buff; bool full_table; uint16_t tt_len, tt_tot; struct sk_buff *skb = NULL; struct batadv_tt_query_packet *tt_response; uint8_t *packet_pos; size_t len; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", tt_request->src, tt_request->ttvn, (tt_request->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); req_ttvn = tt_request->ttvn; orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); if (!orig_node) goto out; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* If the full table has been explicitly requested or the gap * is too big send the whole local translation table */ if (tt_request->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn || !bat_priv->tt.last_changeset) full_table = true; else full_table = false; /* In this version, fragmentation is not implemented, then * I'll send only one packet with as much TT entries as I can */ if (!full_table) { spin_lock_bh(&bat_priv->tt.last_changeset_lock); tt_len = bat_priv->tt.last_changeset_len; tt_tot = tt_len / sizeof(struct batadv_tt_change); len = sizeof(*tt_response) + tt_len; skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN); if (!skb) goto unlock; skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); packet_pos = skb_put(skb, len); tt_response = (struct batadv_tt_query_packet *)packet_pos; tt_response->ttvn = req_ttvn; tt_response->tt_data = htons(tt_tot); tt_buff = skb->data + sizeof(*tt_response); memcpy(tt_buff, bat_priv->tt.last_changeset, bat_priv->tt.last_changeset_len); spin_unlock_bh(&bat_priv->tt.last_changeset_lock); } else { tt_len = (uint16_t)atomic_read(&bat_priv->tt.local_entry_num); tt_len *= sizeof(struct batadv_tt_change); ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); skb = batadv_tt_response_fill_table(tt_len, ttvn, bat_priv->tt.local_hash, bat_priv, batadv_tt_local_valid_entry, NULL); if (!skb) goto out; tt_response = (struct batadv_tt_query_packet *)skb->data; } tt_response->header.packet_type = BATADV_TT_QUERY; tt_response->header.version = BATADV_COMPAT_VERSION; tt_response->header.ttl = BATADV_TTL; memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN); memcpy(tt_response->dst, tt_request->src, ETH_ALEN); tt_response->flags = BATADV_TT_RESPONSE; if (full_table) tt_response->flags |= BATADV_TT_FULL_TABLE; batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_RESPONSE to %pM [%c]\n", orig_node->orig, (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX); if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) ret = true; goto out; unlock: spin_unlock_bh(&bat_priv->tt.last_changeset_lock); out: if (orig_node) batadv_orig_node_free_ref(orig_node); if (primary_if) batadv_hardif_free_ref(primary_if); if (!ret) kfree_skb(skb); /* This packet was for me, so it doesn't need to be re-routed */ return true; } bool batadv_send_tt_response(struct batadv_priv *bat_priv, struct batadv_tt_query_packet *tt_request) { if (batadv_is_my_mac(bat_priv, tt_request->dst)) { /* don't answer backbone gws! */ if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src)) return true; return batadv_send_my_tt_response(bat_priv, tt_request); } else { return batadv_send_other_tt_response(bat_priv, tt_request); } } static void _batadv_tt_update_changes(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, struct batadv_tt_change *tt_change, uint16_t tt_num_changes, uint8_t ttvn) { int i; int roams; for (i = 0; i < tt_num_changes; i++) { if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) { roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM; batadv_tt_global_del(bat_priv, orig_node, (tt_change + i)->addr, "tt removed by changes", roams); } else { if (!batadv_tt_global_add(bat_priv, orig_node, (tt_change + i)->addr, (tt_change + i)->flags, ttvn)) /* In case of problem while storing a * global_entry, we stop the updating * procedure without committing the * ttvn change. This will avoid to send * corrupted data on tt_request */ return; } } orig_node->tt_initialised = true; } static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv, struct batadv_tt_query_packet *tt_response) { struct batadv_orig_node *orig_node; orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); if (!orig_node) goto out; /* Purge the old table first.. */ batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table"); _batadv_tt_update_changes(bat_priv, orig_node, (struct batadv_tt_change *)(tt_response + 1), ntohs(tt_response->tt_data), tt_response->ttvn); spin_lock_bh(&orig_node->tt_buff_lock); kfree(orig_node->tt_buff); orig_node->tt_buff_len = 0; orig_node->tt_buff = NULL; spin_unlock_bh(&orig_node->tt_buff_lock); atomic_set(&orig_node->last_ttvn, tt_response->ttvn); out: if (orig_node) batadv_orig_node_free_ref(orig_node); } static void batadv_tt_update_changes(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, uint16_t tt_num_changes, uint8_t ttvn, struct batadv_tt_change *tt_change) { _batadv_tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes, ttvn); batadv_tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change, tt_num_changes); atomic_set(&orig_node->last_ttvn, ttvn); } bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr) { struct batadv_tt_local_entry *tt_local_entry; bool ret = false; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); if (!tt_local_entry) goto out; /* Check if the client has been logically deleted (but is kept for * consistency purpose) */ if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) || (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM)) goto out; ret = true; out: if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return ret; } void batadv_handle_tt_response(struct batadv_priv *bat_priv, struct batadv_tt_query_packet *tt_response) { struct batadv_tt_req_node *node, *safe; struct batadv_orig_node *orig_node = NULL; struct batadv_tt_change *tt_change; batadv_dbg(BATADV_DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n", tt_response->src, tt_response->ttvn, ntohs(tt_response->tt_data), (tt_response->flags & BATADV_TT_FULL_TABLE ? 'F' : '.')); /* we should have never asked a backbone gw */ if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src)) goto out; orig_node = batadv_orig_hash_find(bat_priv, tt_response->src); if (!orig_node) goto out; if (tt_response->flags & BATADV_TT_FULL_TABLE) { batadv_tt_fill_gtable(bat_priv, tt_response); } else { tt_change = (struct batadv_tt_change *)(tt_response + 1); batadv_tt_update_changes(bat_priv, orig_node, ntohs(tt_response->tt_data), tt_response->ttvn, tt_change); } /* Delete the tt_req_node from pending tt_requests list */ spin_lock_bh(&bat_priv->tt.req_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) { if (!batadv_compare_eth(node->addr, tt_response->src)) continue; list_del(&node->list); kfree(node); } spin_unlock_bh(&bat_priv->tt.req_list_lock); /* Recalculate the CRC for this orig_node and store it */ orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); out: if (orig_node) batadv_orig_node_free_ref(orig_node); } int batadv_tt_init(struct batadv_priv *bat_priv) { int ret; ret = batadv_tt_local_init(bat_priv); if (ret < 0) return ret; ret = batadv_tt_global_init(bat_priv); if (ret < 0) return ret; INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge); queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); return 1; } static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv) { struct batadv_tt_roam_node *node, *safe; spin_lock_bh(&bat_priv->tt.roam_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { list_del(&node->list); kfree(node); } spin_unlock_bh(&bat_priv->tt.roam_list_lock); } static void batadv_tt_roam_purge(struct batadv_priv *bat_priv) { struct batadv_tt_roam_node *node, *safe; spin_lock_bh(&bat_priv->tt.roam_list_lock); list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) { if (!batadv_has_timed_out(node->first_time, BATADV_ROAMING_MAX_TIME)) continue; list_del(&node->list); kfree(node); } spin_unlock_bh(&bat_priv->tt.roam_list_lock); } /* 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 */ static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, uint8_t *client) { struct batadv_tt_roam_node *tt_roam_node; bool ret = false; spin_lock_bh(&bat_priv->tt.roam_list_lock); /* The new tt_req will be issued only if I'm not waiting for a * reply from the same orig_node yet */ list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) { if (!batadv_compare_eth(tt_roam_node->addr, client)) continue; if (batadv_has_timed_out(tt_roam_node->first_time, BATADV_ROAMING_MAX_TIME)) continue; if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter)) /* Sorry, you roamed too many times! */ goto unlock; ret = true; break; } if (!ret) { tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC); if (!tt_roam_node) goto unlock; tt_roam_node->first_time = jiffies; atomic_set(&tt_roam_node->counter, BATADV_ROAMING_MAX_COUNT - 1); memcpy(tt_roam_node->addr, client, ETH_ALEN); list_add(&tt_roam_node->list, &bat_priv->tt.roam_list); ret = true; } unlock: spin_unlock_bh(&bat_priv->tt.roam_list_lock); return ret; } static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, struct batadv_orig_node *orig_node) { struct sk_buff *skb = NULL; struct batadv_roam_adv_packet *roam_adv_packet; int ret = 1; struct batadv_hard_iface *primary_if; size_t len = sizeof(*roam_adv_packet); /* before going on we have to check whether the client has * already roamed to us too many times */ if (!batadv_tt_check_roam_count(bat_priv, client)) goto out; skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN); if (!skb) goto out; skb->priority = TC_PRIO_CONTROL; skb_reserve(skb, ETH_HLEN); roam_adv_packet = (struct batadv_roam_adv_packet *)skb_put(skb, len); roam_adv_packet->header.packet_type = BATADV_ROAM_ADV; roam_adv_packet->header.version = BATADV_COMPAT_VERSION; roam_adv_packet->header.ttl = BATADV_TTL; roam_adv_packet->reserved = 0; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN); batadv_hardif_free_ref(primary_if); memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN); memcpy(roam_adv_packet->client, client, ETH_ALEN); batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending ROAMING_ADV to %pM (client %pM)\n", orig_node->orig, client); batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX); if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) ret = 0; out: if (ret && skb) kfree_skb(skb); return; } static void batadv_tt_purge(struct work_struct *work) { struct delayed_work *delayed_work; struct batadv_priv_tt *priv_tt; struct batadv_priv *bat_priv; delayed_work = container_of(work, struct delayed_work, 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_global_purge(bat_priv); batadv_tt_req_purge(bat_priv); batadv_tt_roam_purge(bat_priv); queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work, msecs_to_jiffies(BATADV_TT_WORK_PERIOD)); } void batadv_tt_free(struct batadv_priv *bat_priv) { cancel_delayed_work_sync(&bat_priv->tt.work); batadv_tt_local_table_free(bat_priv); batadv_tt_global_table_free(bat_priv); batadv_tt_req_list_free(bat_priv); batadv_tt_changes_list_free(bat_priv); batadv_tt_roam_list_free(bat_priv); kfree(bat_priv->tt.last_changeset); } /* This function will enable or disable the specified flags for all the entries * in the given hash table and returns the number of modified entries */ static uint16_t batadv_tt_set_flags(struct batadv_hashtable *hash, uint16_t flags, bool enable) { uint32_t i; uint16_t changed_num = 0; struct hlist_head *head; struct batadv_tt_common_entry *tt_common_entry; if (!hash) goto out; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { if (enable) { if ((tt_common_entry->flags & flags) == flags) continue; tt_common_entry->flags |= flags; } else { if (!(tt_common_entry->flags & flags)) continue; tt_common_entry->flags &= ~flags; } changed_num++; } rcu_read_unlock(); } out: return changed_num; } /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ 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 hlist_node *node_tmp; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ uint32_t i; if (!hash) return; for (i = 0; i < hash->size; i++) { head = &hash->table[i]; list_lock = &hash->list_locks[i]; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common, node_tmp, head, hash_entry) { if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING)) continue; batadv_dbg(BATADV_DBG_TT, bat_priv, "Deleting local tt entry (%pM): pending\n", tt_common->addr); atomic_dec(&bat_priv->tt.local_entry_num); hlist_del_rcu(&tt_common->hash_entry); tt_local = container_of(tt_common, struct batadv_tt_local_entry, common); batadv_tt_local_entry_free_ref(tt_local); } spin_unlock_bh(list_lock); } } static int batadv_tt_commit_changes(struct batadv_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int packet_min_len) { uint16_t changed_num = 0; if (atomic_read(&bat_priv->tt.local_changes) < 1) return -ENOENT; changed_num = batadv_tt_set_flags(bat_priv->tt.local_hash, BATADV_TT_CLIENT_NEW, false); /* all reset entries have to be counted as local entries */ atomic_add(changed_num, &bat_priv->tt.local_entry_num); batadv_tt_local_purge_pending_clients(bat_priv); bat_priv->tt.local_crc = batadv_tt_local_crc(bat_priv); /* Increment the TTVN only once per OGM interval */ atomic_inc(&bat_priv->tt.vn); batadv_dbg(BATADV_DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n", (uint8_t)atomic_read(&bat_priv->tt.vn)); /* reset the sending counter */ atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX); return batadv_tt_changes_fill_buff(bat_priv, packet_buff, packet_buff_len, packet_min_len); } /* when calling this function (hard_iface == primary_if) has to be true */ int batadv_tt_append_diff(struct batadv_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int packet_min_len) { int tt_num_changes; /* if at least one change happened */ tt_num_changes = batadv_tt_commit_changes(bat_priv, packet_buff, packet_buff_len, packet_min_len); /* if the changes have been sent often enough */ if ((tt_num_changes < 0) && (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))) { batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, packet_min_len, packet_min_len); tt_num_changes = 0; } return tt_num_changes; } bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src, uint8_t *dst) { struct batadv_tt_local_entry *tt_local_entry = NULL; struct batadv_tt_global_entry *tt_global_entry = NULL; bool ret = false; if (!atomic_read(&bat_priv->ap_isolation)) goto out; tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst); if (!tt_local_entry) goto out; tt_global_entry = batadv_tt_global_hash_find(bat_priv, src); if (!tt_global_entry) goto out; if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry)) goto out; ret = true; out: if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); return ret; } void batadv_tt_update_orig(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *tt_buff, uint8_t tt_num_changes, uint8_t ttvn, uint16_t tt_crc) { uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); bool full_table = true; struct batadv_tt_change *tt_change; /* don't care about a backbone gateways updates. */ if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) return; /* orig table not initialised AND first diff is in the OGM OR the ttvn * increased by one -> we can apply the attached changes */ if ((!orig_node->tt_initialised && ttvn == 1) || ttvn - orig_ttvn == 1) { /* the OGM could not contain the changes due to their size or * because they have already been sent BATADV_TT_OGM_APPEND_MAX * times. * In this case send a tt request */ if (!tt_num_changes) { full_table = false; goto request_table; } tt_change = (struct batadv_tt_change *)tt_buff; batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, tt_change); /* Even if we received the precomputed crc with the OGM, we * prefer to recompute it to spot any possible inconsistency * in the global table */ orig_node->tt_crc = batadv_tt_global_crc(bat_priv, orig_node); /* The ttvn alone is not enough to guarantee consistency * because a single value could represent different states * (due to the wrap around). Thus a node has to check whether * the resulting table (after applying the changes) is still * consistent or not. E.g. a node could disconnect while its * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case * checking the CRC value is mandatory to detect the * inconsistency */ if (orig_node->tt_crc != tt_crc) goto request_table; } else { /* if we missed more than one change or our tables are not * in sync anymore -> request fresh tt data */ if (!orig_node->tt_initialised || ttvn != orig_ttvn || orig_node->tt_crc != tt_crc) { request_table: batadv_dbg(BATADV_DBG_TT, bat_priv, "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %#.4x last_crc: %#.4x num_changes: %u)\n", orig_node->orig, ttvn, orig_ttvn, tt_crc, orig_node->tt_crc, tt_num_changes); batadv_send_tt_request(bat_priv, orig_node, ttvn, tt_crc, full_table); return; } } } /* returns true whether we know that the client has moved from its old * originator to another one. This entry is kept is still kept for consistency * purposes */ bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv, uint8_t *addr) { struct batadv_tt_global_entry *tt_global_entry; bool ret = false; tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); if (!tt_global_entry) goto out; ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM; batadv_tt_global_entry_free_ref(tt_global_entry); out: return ret; } /** * batadv_tt_local_client_is_roaming - tells whether the client is roaming * @bat_priv: the bat priv with all the soft interface information * @addr: the MAC address of the local client to query * * Returns 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 */ bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv, uint8_t *addr) { struct batadv_tt_local_entry *tt_local_entry; bool ret = false; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); if (!tt_local_entry) goto out; ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM; batadv_tt_local_entry_free_ref(tt_local_entry); out: return ret; } bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, const unsigned char *addr) { bool ret = false; /* if the originator is a backbone node (meaning it belongs to the same * LAN of this node) the temporary client must not be added because to * reach such destination the node must use the LAN instead of the mesh */ if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig)) goto out; if (!batadv_tt_global_add(bat_priv, orig_node, addr, BATADV_TT_CLIENT_TEMP, atomic_read(&orig_node->last_ttvn))) goto out; batadv_dbg(BATADV_DBG_TT, bat_priv, "Added temporary global client (addr: %pM orig: %pM)\n", addr, orig_node->orig); ret = true; out: return ret; }