/* Copyright (C) 2007-2012 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 static void batadv_send_roam_adv(struct bat_priv *bat_priv, uint8_t *client, struct orig_node *orig_node); static void batadv_tt_purge(struct work_struct *work); static void batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry); /* 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 tt_common_entry, hash_entry); return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0); } static void batadv_tt_start_timer(struct bat_priv *bat_priv) { INIT_DELAYED_WORK(&bat_priv->tt_work, batadv_tt_purge); queue_delayed_work(batadv_event_workqueue, &bat_priv->tt_work, msecs_to_jiffies(5000)); } static struct tt_common_entry *batadv_tt_hash_find(struct hashtable_t *hash, const void *data) { struct hlist_head *head; struct hlist_node *node; struct tt_common_entry *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, node, 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 tt_local_entry * batadv_tt_local_hash_find(struct bat_priv *bat_priv, const void *data) { struct tt_common_entry *tt_common_entry; struct 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 tt_local_entry, common); return tt_local_entry; } static struct tt_global_entry * batadv_tt_global_hash_find(struct bat_priv *bat_priv, const void *data) { struct tt_common_entry *tt_common_entry; struct 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 tt_global_entry, common); return tt_global_entry; } static void batadv_tt_local_entry_free_ref(struct 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 tt_common_entry *tt_common_entry; struct tt_global_entry *tt_global_entry; tt_common_entry = container_of(rcu, struct tt_common_entry, rcu); tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, common); kfree(tt_global_entry); } static void batadv_tt_global_entry_free_ref(struct 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 tt_orig_list_entry *orig_entry; orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu); batadv_orig_node_free_ref(orig_entry->orig_node); kfree(orig_entry); } static void batadv_tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry) { /* 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); } static void batadv_tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr, uint8_t flags) { struct tt_change_node *tt_change_node, *entry, *safe; 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, addr, ETH_ALEN); del_op_requested = flags & 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, 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 & 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); 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 tt_change); } static int batadv_tt_local_init(struct bat_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; return 0; } void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, int ifindex) { struct bat_priv *bat_priv = netdev_priv(soft_iface); struct tt_local_entry *tt_local_entry = NULL; struct tt_global_entry *tt_global_entry = NULL; struct hlist_head *head; struct hlist_node *node; struct tt_orig_list_entry *orig_entry; int hash_added; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); if (tt_local_entry) { tt_local_entry->last_seen = jiffies; /* possibly unset the TT_CLIENT_PENDING flag */ tt_local_entry->common.flags &= ~TT_CLIENT_PENDING; goto out; } tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC); if (!tt_local_entry) goto out; batadv_dbg(DBG_TT, bat_priv, "Creating new local tt entry: %pM (ttvn: %d)\n", addr, (uint8_t)atomic_read(&bat_priv->ttvn)); memcpy(tt_local_entry->common.addr, addr, ETH_ALEN); tt_local_entry->common.flags = NO_FLAGS; if (batadv_is_wifi_iface(ifindex)) tt_local_entry->common.flags |= TT_CLIENT_WIFI; atomic_set(&tt_local_entry->common.refcount, 2); tt_local_entry->last_seen = jiffies; /* the batman interface mac address should never be purged */ if (batadv_compare_eth(addr, soft_iface->dev_addr)) tt_local_entry->common.flags |= TT_CLIENT_NOPURGE; /* 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_entry->common.flags |= TT_CLIENT_NEW; hash_added = batadv_hash_add(bat_priv->tt_local_hash, batadv_compare_tt, batadv_choose_orig, &tt_local_entry->common, &tt_local_entry->common.hash_entry); if (unlikely(hash_added != 0)) { /* remove the reference for the hash */ batadv_tt_local_entry_free_ref(tt_local_entry); goto out; } batadv_tt_local_event(bat_priv, addr, tt_local_entry->common.flags); /* remove address from global hash if present */ tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr); /* Check whether it is a roaming! */ if (tt_global_entry) { /* These node are probably going to update their tt table */ head = &tt_global_entry->orig_list; rcu_read_lock(); hlist_for_each_entry_rcu(orig_entry, node, head, list) { orig_entry->orig_node->tt_poss_change = true; batadv_send_roam_adv(bat_priv, tt_global_entry->common.addr, orig_entry->orig_node); } rcu_read_unlock(); /* The global entry has to be marked as ROAMING and * has to be kept for consistency purpose */ tt_global_entry->common.flags |= TT_CLIENT_ROAM; tt_global_entry->roam_at = jiffies; } out: if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); } 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 bat_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int min_packet_len) { struct hard_iface *primary_if; int req_len; primary_if = batadv_primary_if_get_selected(bat_priv); 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 ((!primary_if) || (req_len > primary_if->soft_iface->mtu)) req_len = min_packet_len; batadv_tt_realloc_packet_buff(packet_buff, packet_buff_len, min_packet_len, req_len); if (primary_if) batadv_hardif_free_ref(primary_if); } static int batadv_tt_changes_fill_buff(struct bat_priv *bat_priv, unsigned char **packet_buff, int *packet_buff_len, int min_packet_len) { struct 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 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_buff_lock); kfree(bat_priv->tt_buff); bat_priv->tt_buff_len = 0; bat_priv->tt_buff = 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_buff = kmalloc(new_len, GFP_ATOMIC); if (bat_priv->tt_buff) { memcpy(bat_priv->tt_buff, tt_buff, new_len); bat_priv->tt_buff_len = new_len; } } spin_unlock_bh(&bat_priv->tt_buff_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 bat_priv *bat_priv = netdev_priv(net_dev); struct hashtable_t *hash = bat_priv->tt_local_hash; struct tt_common_entry *tt_common_entry; struct hard_iface *primary_if; struct hlist_node *node; struct hlist_head *head; uint32_t i; int ret = 0; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) { ret = seq_printf(seq, "BATMAN mesh %s disabled - please specify interfaces to enable it\n", net_dev->name); goto out; } if (primary_if->if_status != IF_ACTIVE) { ret = seq_printf(seq, "BATMAN mesh %s disabled - primary interface not active\n", net_dev->name); goto out; } seq_printf(seq, "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n", net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn)); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { seq_printf(seq, " * %pM [%c%c%c%c%c]\n", tt_common_entry->addr, (tt_common_entry->flags & TT_CLIENT_ROAM ? 'R' : '.'), (tt_common_entry->flags & TT_CLIENT_NOPURGE ? 'P' : '.'), (tt_common_entry->flags & TT_CLIENT_NEW ? 'N' : '.'), (tt_common_entry->flags & TT_CLIENT_PENDING ? 'X' : '.'), (tt_common_entry->flags & TT_CLIENT_WIFI ? 'W' : '.')); } rcu_read_unlock(); } out: if (primary_if) batadv_hardif_free_ref(primary_if); return ret; } static void batadv_tt_local_set_pending(struct bat_priv *bat_priv, struct tt_local_entry *tt_local_entry, uint16_t flags, const char *message) { batadv_tt_local_event(bat_priv, tt_local_entry->common.addr, tt_local_entry->common.flags | 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 |= TT_CLIENT_PENDING; batadv_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: %s\n", tt_local_entry->common.addr, message); } void batadv_tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr, const char *message, bool roaming) { struct tt_local_entry *tt_local_entry = NULL; tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr); if (!tt_local_entry) goto out; batadv_tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL | (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message); out: if (tt_local_entry) batadv_tt_local_entry_free_ref(tt_local_entry); } static void batadv_tt_local_purge(struct bat_priv *bat_priv) { struct hashtable_t *hash = bat_priv->tt_local_hash; struct tt_local_entry *tt_local_entry; struct tt_common_entry *tt_common_entry; struct hlist_node *node, *node_tmp; 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); hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, hash_entry) { tt_local_entry = container_of(tt_common_entry, struct tt_local_entry, common); if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE) continue; /* entry already marked for deletion */ if (tt_local_entry->common.flags & TT_CLIENT_PENDING) continue; if (!batadv_has_timed_out(tt_local_entry->last_seen, TT_LOCAL_TIMEOUT)) continue; batadv_tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL, "timed out"); } spin_unlock_bh(list_lock); } } static void batadv_tt_local_table_free(struct bat_priv *bat_priv) { struct hashtable_t *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ struct tt_common_entry *tt_common_entry; struct tt_local_entry *tt_local_entry; struct hlist_node *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, node_tmp, head, hash_entry) { hlist_del_rcu(node); tt_local_entry = container_of(tt_common_entry, struct tt_local_entry, common); batadv_tt_local_entry_free_ref(tt_local_entry); } spin_unlock_bh(list_lock); } batadv_hash_destroy(hash); bat_priv->tt_local_hash = NULL; } static int batadv_tt_global_init(struct bat_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; return 0; } static void batadv_tt_changes_list_free(struct bat_priv *bat_priv) { struct 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); } /* find out if an orig_node is already in the list of a tt_global_entry. * returns 1 if found, 0 otherwise */ static bool batadv_tt_global_entry_has_orig(const struct tt_global_entry *entry, const struct orig_node *orig_node) { struct tt_orig_list_entry *tmp_orig_entry; const struct hlist_head *head; struct hlist_node *node; bool found = false; rcu_read_lock(); head = &entry->orig_list; hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) { if (tmp_orig_entry->orig_node == orig_node) { found = true; break; } } rcu_read_unlock(); return found; } static void batadv_tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry, struct orig_node *orig_node, int ttvn) { struct tt_orig_list_entry *orig_entry; orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC); if (!orig_entry) return; 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; spin_lock_bh(&tt_global_entry->list_lock); hlist_add_head_rcu(&orig_entry->list, &tt_global_entry->orig_list); spin_unlock_bh(&tt_global_entry->list_lock); } /* caller must hold orig_node refcount */ int batadv_tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node, const unsigned char *tt_addr, uint8_t ttvn, bool roaming, bool wifi) { struct tt_global_entry *tt_global_entry = NULL; int ret = 0; int hash_added; struct tt_common_entry *common; tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr); 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 = NO_FLAGS; tt_global_entry->roam_at = 0; atomic_set(&common->refcount, 2); 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; } batadv_tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn); } else { /* there is already a global entry, use this one. */ /* If there is the 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 (tt_global_entry->common.flags & TT_CLIENT_ROAM) { batadv_tt_global_del_orig_list(tt_global_entry); tt_global_entry->common.flags &= ~TT_CLIENT_ROAM; tt_global_entry->roam_at = 0; } if (!batadv_tt_global_entry_has_orig(tt_global_entry, orig_node)) batadv_tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn); } if (wifi) tt_global_entry->common.flags |= TT_CLIENT_WIFI; batadv_dbg(DBG_TT, bat_priv, "Creating new global tt entry: %pM (via %pM)\n", tt_global_entry->common.addr, orig_node->orig); out_remove: /* remove address from local hash if present */ batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr, "global tt received", roaming); ret = 1; out: if (tt_global_entry) batadv_tt_global_entry_free_ref(tt_global_entry); return ret; } /* print all orig nodes who announce the address for this global entry. * it is assumed that the caller holds rcu_read_lock(); */ static void batadv_tt_global_print_entry(struct tt_global_entry *tt_global_entry, struct seq_file *seq) { struct hlist_head *head; struct hlist_node *node; struct tt_orig_list_entry *orig_entry; struct tt_common_entry *tt_common_entry; uint16_t flags; uint8_t last_ttvn; tt_common_entry = &tt_global_entry->common; head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, node, head, list) { flags = tt_common_entry->flags; last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn); seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n", tt_global_entry->common.addr, orig_entry->ttvn, orig_entry->orig_node->orig, last_ttvn, (flags & TT_CLIENT_ROAM ? 'R' : '.'), (flags & TT_CLIENT_WIFI ? 'W' : '.')); } } int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct bat_priv *bat_priv = netdev_priv(net_dev); struct hashtable_t *hash = bat_priv->tt_global_hash; struct tt_common_entry *tt_common_entry; struct tt_global_entry *tt_global_entry; struct hard_iface *primary_if; struct hlist_node *node; struct hlist_head *head; uint32_t i; int ret = 0; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) { ret = seq_printf(seq, "BATMAN mesh %s disabled - please specify interfaces to enable it\n", net_dev->name); goto out; } if (primary_if->if_status != IF_ACTIVE) { ret = seq_printf(seq, "BATMAN mesh %s disabled - primary interface not active\n", net_dev->name); 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 %s\n", "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags"); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) { tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, common); batadv_tt_global_print_entry(tt_global_entry, seq); } rcu_read_unlock(); } out: if (primary_if) batadv_hardif_free_ref(primary_if); return ret; } /* deletes the orig list of a tt_global_entry */ static void batadv_tt_global_del_orig_list(struct tt_global_entry *tt_global_entry) { struct hlist_head *head; struct hlist_node *node, *safe; struct 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, node, safe, head, list) { hlist_del_rcu(node); 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 bat_priv *bat_priv, struct tt_global_entry *tt_global_entry, struct orig_node *orig_node, const char *message) { struct hlist_head *head; struct hlist_node *node, *safe; struct 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, node, safe, head, list) { if (orig_entry->orig_node == orig_node) { batadv_dbg(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(node); batadv_tt_orig_list_entry_free_ref(orig_entry); } } spin_unlock_bh(&tt_global_entry->list_lock); } static void batadv_tt_global_del_struct(struct bat_priv *bat_priv, struct tt_global_entry *tt_global_entry, const char *message) { batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", tt_global_entry->common.addr, message); batadv_hash_remove(bat_priv->tt_global_hash, batadv_compare_tt, batadv_choose_orig, tt_global_entry->common.addr); batadv_tt_global_entry_free_ref(tt_global_entry); } /* 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 TT_CLIENT_ROAM flag and the timer, * otherwise we simply remove the originator scheduled for deletion. */ static void batadv_tt_global_del_roaming(struct bat_priv *bat_priv, struct tt_global_entry *tt_global_entry, struct orig_node *orig_node, const char *message) { bool last_entry = true; struct hlist_head *head; struct hlist_node *node; struct 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, node, 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 |= 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 bat_priv *bat_priv, struct orig_node *orig_node, const unsigned char *addr, const char *message, bool roaming) { struct tt_global_entry *tt_global_entry = NULL; struct 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_del_struct(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 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_del_struct(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 bat_priv *bat_priv, struct orig_node *orig_node, const char *message) { struct tt_global_entry *global_entry; struct tt_common_entry *tt_common_entry; uint32_t i; struct hashtable_t *hash = bat_priv->tt_global_hash; struct hlist_node *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, node, safe, head, hash_entry) { global_entry = container_of(tt_common_entry, struct tt_global_entry, common); batadv_tt_global_del_orig_entry(bat_priv, global_entry, orig_node, message); if (hlist_empty(&global_entry->orig_list)) { batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry %pM: %s\n", global_entry->common.addr, message); hlist_del_rcu(node); batadv_tt_global_entry_free_ref(global_entry); } } spin_unlock_bh(list_lock); } orig_node->tt_initialised = false; } static void batadv_tt_global_roam_purge(struct bat_priv *bat_priv) { struct hashtable_t *hash = bat_priv->tt_global_hash; struct tt_common_entry *tt_common_entry; struct tt_global_entry *tt_global_entry; struct hlist_node *node, *node_tmp; 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); hlist_for_each_entry_safe(tt_common_entry, node, node_tmp, head, hash_entry) { tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, common); if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM)) continue; if (!batadv_has_timed_out(tt_global_entry->roam_at, TT_CLIENT_ROAM_TIMEOUT)) continue; batadv_dbg(DBG_TT, bat_priv, "Deleting global tt entry (%pM): Roaming timeout\n", tt_global_entry->common.addr); hlist_del_rcu(node); batadv_tt_global_entry_free_ref(tt_global_entry); } spin_unlock_bh(list_lock); } } static void batadv_tt_global_table_free(struct bat_priv *bat_priv) { struct hashtable_t *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ struct tt_common_entry *tt_common_entry; struct tt_global_entry *tt_global_entry; struct hlist_node *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, node_tmp, head, hash_entry) { hlist_del_rcu(node); tt_global_entry = container_of(tt_common_entry, struct tt_global_entry, common); batadv_tt_global_entry_free_ref(tt_global_entry); } spin_unlock_bh(list_lock); } batadv_hash_destroy(hash); bat_priv->tt_global_hash = NULL; } static bool _batadv_is_ap_isolated(struct tt_local_entry *tt_local_entry, struct tt_global_entry *tt_global_entry) { bool ret = false; if (tt_local_entry->common.flags & TT_CLIENT_WIFI && tt_global_entry->common.flags & TT_CLIENT_WIFI) ret = true; return ret; } struct orig_node *batadv_transtable_search(struct bat_priv *bat_priv, const uint8_t *src, const uint8_t *addr) { struct tt_local_entry *tt_local_entry = NULL; struct tt_global_entry *tt_global_entry = NULL; struct orig_node *orig_node = NULL; struct neigh_node *router = NULL; struct hlist_head *head; struct hlist_node *node; struct tt_orig_list_entry *orig_entry; int best_tq; if (src && atomic_read(&bat_priv->ap_isolation)) { tt_local_entry = batadv_tt_local_hash_find(bat_priv, src); if (!tt_local_entry) 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; best_tq = 0; rcu_read_lock(); head = &tt_global_entry->orig_list; hlist_for_each_entry_rcu(orig_entry, node, head, list) { router = batadv_orig_node_get_router(orig_entry->orig_node); if (!router) continue; if (router->tq_avg > best_tq) { orig_node = orig_entry->orig_node; best_tq = router->tq_avg; } batadv_neigh_node_free_ref(router); } /* found anything? */ 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 bat_priv *bat_priv, struct orig_node *orig_node) { uint16_t total = 0, total_one; struct hashtable_t *hash = bat_priv->tt_global_hash; struct tt_common_entry *tt_common_entry; struct tt_global_entry *tt_global_entry; struct hlist_node *node; 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_entry, node, head, hash_entry) { tt_global_entry = container_of(tt_common_entry, struct 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_global_entry->common.flags & TT_CLIENT_ROAM) continue; /* find out if this global entry is announced by this * originator */ if (!batadv_tt_global_entry_has_orig(tt_global_entry, orig_node)) continue; total_one = 0; for (j = 0; j < ETH_ALEN; j++) total_one = crc16_byte(total_one, tt_global_entry->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 bat_priv *bat_priv) { uint16_t total = 0, total_one; struct hashtable_t *hash = bat_priv->tt_local_hash; struct tt_common_entry *tt_common_entry; struct hlist_node *node; 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_entry, node, head, hash_entry) { /* not yet committed clients have not to be taken into * account while computing the CRC */ if (tt_common_entry->flags & TT_CLIENT_NEW) continue; total_one = 0; for (j = 0; j < ETH_ALEN; j++) total_one = crc16_byte(total_one, tt_common_entry->addr[j]); total ^= total_one; } rcu_read_unlock(); } return total; } static void batadv_tt_req_list_free(struct bat_priv *bat_priv) { struct 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 bat_priv *bat_priv, struct 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 bat_priv *bat_priv) { struct 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, 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 tt_req_node *batadv_new_tt_req_node(struct bat_priv *bat_priv, struct orig_node *orig_node) { struct 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, 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 tt_common_entry *tt_common_entry = entry_ptr; if (tt_common_entry->flags & TT_CLIENT_NEW) return 0; return 1; } static int batadv_tt_global_valid(const void *entry_ptr, const void *data_ptr) { const struct tt_common_entry *tt_common_entry = entry_ptr; const struct tt_global_entry *tt_global_entry; const struct orig_node *orig_node = data_ptr; if (tt_common_entry->flags & TT_CLIENT_ROAM) return 0; tt_global_entry = container_of(tt_common_entry, struct 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 hashtable_t *hash, struct hard_iface *primary_if, int (*valid_cb)(const void *, const void *), void *cb_data) { struct tt_common_entry *tt_common_entry; struct tt_query_packet *tt_response; struct tt_change *tt_change; struct hlist_node *node; struct hlist_head *head; struct sk_buff *skb = NULL; uint16_t tt_tot, tt_count; ssize_t tt_query_size = sizeof(struct tt_query_packet); uint32_t i; if (tt_query_size + tt_len > primary_if->soft_iface->mtu) { tt_len = primary_if->soft_iface->mtu - tt_query_size; tt_len -= tt_len % sizeof(struct tt_change); } tt_tot = tt_len / sizeof(struct tt_change); skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN); if (!skb) goto out; skb_reserve(skb, ETH_HLEN); tt_response = (struct tt_query_packet *)skb_put(skb, tt_query_size + tt_len); tt_response->ttvn = ttvn; tt_change = (struct 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, node, 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 = NO_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 bat_priv *bat_priv, struct orig_node *dst_orig_node, uint8_t ttvn, uint16_t tt_crc, bool full_table) { struct sk_buff *skb = NULL; struct tt_query_packet *tt_request; struct neigh_node *neigh_node = NULL; struct hard_iface *primary_if; struct tt_req_node *tt_req_node = NULL; int ret = 1; 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 = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN); if (!skb) goto out; skb_reserve(skb, ETH_HLEN); tt_request = (struct tt_query_packet *)skb_put(skb, sizeof(struct tt_query_packet)); tt_request->header.packet_type = BAT_TT_QUERY; tt_request->header.version = 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 = TTL; tt_request->ttvn = ttvn; tt_request->tt_data = htons(tt_crc); tt_request->flags = TT_REQUEST; if (full_table) tt_request->flags |= TT_FULL_TABLE; neigh_node = batadv_orig_node_get_router(dst_orig_node); if (!neigh_node) goto out; batadv_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM [%c]\n", dst_orig_node->orig, neigh_node->addr, (full_table ? 'F' : '.')); batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX); batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); ret = 0; out: if (neigh_node) batadv_neigh_node_free_ref(neigh_node); 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 bat_priv *bat_priv, struct tt_query_packet *tt_request) { struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL; struct neigh_node *neigh_node = NULL; struct hard_iface *primary_if = NULL; uint8_t orig_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 tt_query_packet *tt_response; batadv_dbg(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 & 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; neigh_node = batadv_orig_node_get_router(res_dst_orig_node); if (!neigh_node) goto out; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) 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 & 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 tt_change); skb = dev_alloc_skb(sizeof(struct tt_query_packet) + tt_len + ETH_HLEN); if (!skb) goto unlock; skb_reserve(skb, ETH_HLEN); tt_response = (struct tt_query_packet *)skb_put(skb, sizeof(struct tt_query_packet) + tt_len); tt_response->ttvn = req_ttvn; tt_response->tt_data = htons(tt_tot); tt_buff = skb->data + sizeof(struct tt_query_packet); /* 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) * sizeof(struct 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, primary_if, batadv_tt_global_valid, req_dst_orig_node); if (!skb) goto out; tt_response = (struct tt_query_packet *)skb->data; } tt_response->header.packet_type = BAT_TT_QUERY; tt_response->header.version = COMPAT_VERSION; tt_response->header.ttl = TTL; memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN); memcpy(tt_response->dst, tt_request->src, ETH_ALEN); tt_response->flags = TT_RESPONSE; if (full_table) tt_response->flags |= TT_FULL_TABLE; batadv_dbg(DBG_TT, bat_priv, "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n", res_dst_orig_node->orig, neigh_node->addr, req_dst_orig_node->orig, req_ttvn); batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); 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 (neigh_node) batadv_neigh_node_free_ref(neigh_node); if (primary_if) batadv_hardif_free_ref(primary_if); if (!ret) kfree_skb(skb); return ret; } static bool batadv_send_my_tt_response(struct bat_priv *bat_priv, struct tt_query_packet *tt_request) { struct orig_node *orig_node = NULL; struct neigh_node *neigh_node = NULL; struct 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 tt_query_packet *tt_response; batadv_dbg(DBG_TT, bat_priv, "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n", tt_request->src, tt_request->ttvn, (tt_request->flags & TT_FULL_TABLE ? 'F' : '.')); my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); req_ttvn = tt_request->ttvn; orig_node = batadv_orig_hash_find(bat_priv, tt_request->src); if (!orig_node) goto out; neigh_node = batadv_orig_node_get_router(orig_node); if (!neigh_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 & TT_FULL_TABLE || my_ttvn != req_ttvn || !bat_priv->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(&bat_priv->tt_buff_lock); tt_len = bat_priv->tt_buff_len; tt_tot = tt_len / sizeof(struct tt_change); skb = dev_alloc_skb(sizeof(struct tt_query_packet) + tt_len + ETH_HLEN); if (!skb) goto unlock; skb_reserve(skb, ETH_HLEN); tt_response = (struct tt_query_packet *)skb_put(skb, sizeof(struct tt_query_packet) + tt_len); tt_response->ttvn = req_ttvn; tt_response->tt_data = htons(tt_tot); tt_buff = skb->data + sizeof(struct tt_query_packet); memcpy(tt_buff, bat_priv->tt_buff, bat_priv->tt_buff_len); spin_unlock_bh(&bat_priv->tt_buff_lock); } else { tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) * sizeof(struct tt_change); ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); skb = batadv_tt_response_fill_table(tt_len, ttvn, bat_priv->tt_local_hash, primary_if, batadv_tt_local_valid_entry, NULL); if (!skb) goto out; tt_response = (struct tt_query_packet *)skb->data; } tt_response->header.packet_type = BAT_TT_QUERY; tt_response->header.version = COMPAT_VERSION; tt_response->header.ttl = 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 = TT_RESPONSE; if (full_table) tt_response->flags |= TT_FULL_TABLE; batadv_dbg(DBG_TT, bat_priv, "Sending TT_RESPONSE to %pM via %pM [%c]\n", orig_node->orig, neigh_node->addr, (tt_response->flags & TT_FULL_TABLE ? 'F' : '.')); batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX); batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); ret = true; goto out; unlock: spin_unlock_bh(&bat_priv->tt_buff_lock); out: if (orig_node) batadv_orig_node_free_ref(orig_node); if (neigh_node) batadv_neigh_node_free_ref(neigh_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 bat_priv *bat_priv, struct tt_query_packet *tt_request) { if (batadv_is_my_mac(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 bat_priv *bat_priv, struct orig_node *orig_node, struct tt_change *tt_change, uint16_t tt_num_changes, uint8_t ttvn) { int i; int is_wifi; int roams; for (i = 0; i < tt_num_changes; i++) { if ((tt_change + i)->flags & TT_CLIENT_DEL) { roams = (tt_change + i)->flags & TT_CLIENT_ROAM; batadv_tt_global_del(bat_priv, orig_node, (tt_change + i)->addr, "tt removed by changes", roams); } else { is_wifi = (tt_change + i)->flags & TT_CLIENT_WIFI; if (!batadv_tt_global_add(bat_priv, orig_node, (tt_change + i)->addr, ttvn, false, is_wifi)) /* 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 bat_priv *bat_priv, struct tt_query_packet *tt_response) { struct orig_node *orig_node = NULL; 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 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 bat_priv *bat_priv, struct orig_node *orig_node, uint16_t tt_num_changes, uint8_t ttvn, struct 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 bat_priv *bat_priv, const uint8_t *addr) { struct tt_local_entry *tt_local_entry = NULL; 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 & TT_CLIENT_PENDING) 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 bat_priv *bat_priv, struct tt_query_packet *tt_response) { struct tt_req_node *node, *safe; struct orig_node *orig_node = NULL; batadv_dbg(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 & 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 & TT_FULL_TABLE) batadv_tt_fill_gtable(bat_priv, tt_response); else batadv_tt_update_changes(bat_priv, orig_node, ntohs(tt_response->tt_data), tt_response->ttvn, (struct tt_change *)(tt_response + 1)); /* 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); /* Roaming phase is over: tables are in sync again. I can * unset the flag */ orig_node->tt_poss_change = false; out: if (orig_node) batadv_orig_node_free_ref(orig_node); } int batadv_tt_init(struct bat_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; batadv_tt_start_timer(bat_priv); return 1; } static void batadv_tt_roam_list_free(struct bat_priv *bat_priv) { struct 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 bat_priv *bat_priv) { struct 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, 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 bat_priv *bat_priv, uint8_t *client) { struct 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, 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, 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 bat_priv *bat_priv, uint8_t *client, struct orig_node *orig_node) { struct neigh_node *neigh_node = NULL; struct sk_buff *skb = NULL; struct roam_adv_packet *roam_adv_packet; int ret = 1; struct hard_iface *primary_if; /* 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 = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN); if (!skb) goto out; skb_reserve(skb, ETH_HLEN); roam_adv_packet = (struct roam_adv_packet *)skb_put(skb, sizeof(struct roam_adv_packet)); roam_adv_packet->header.packet_type = BAT_ROAM_ADV; roam_adv_packet->header.version = COMPAT_VERSION; roam_adv_packet->header.ttl = TTL; 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); neigh_node = batadv_orig_node_get_router(orig_node); if (!neigh_node) goto out; batadv_dbg(DBG_TT, bat_priv, "Sending ROAMING_ADV to %pM (client %pM) via %pM\n", orig_node->orig, client, neigh_node->addr); batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX); batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); ret = 0; out: if (neigh_node) batadv_neigh_node_free_ref(neigh_node); if (ret) kfree_skb(skb); return; } static void batadv_tt_purge(struct work_struct *work) { struct delayed_work *delayed_work = container_of(work, struct delayed_work, work); struct bat_priv *bat_priv = container_of(delayed_work, struct bat_priv, tt_work); batadv_tt_local_purge(bat_priv); batadv_tt_global_roam_purge(bat_priv); batadv_tt_req_purge(bat_priv); batadv_tt_roam_purge(bat_priv); batadv_tt_start_timer(bat_priv); } void batadv_tt_free(struct bat_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_buff); } /* 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 hashtable_t *hash, uint16_t flags, bool enable) { uint32_t i; uint16_t changed_num = 0; struct hlist_head *head; struct hlist_node *node; struct 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, node, 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 TT_CLIENT_PENDING */ static void batadv_tt_local_purge_pending_clients(struct bat_priv *bat_priv) { struct hashtable_t *hash = bat_priv->tt_local_hash; struct tt_common_entry *tt_common_entry; struct tt_local_entry *tt_local_entry; struct hlist_node *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_entry, node, node_tmp, head, hash_entry) { if (!(tt_common_entry->flags & TT_CLIENT_PENDING)) continue; batadv_dbg(DBG_TT, bat_priv, "Deleting local tt entry (%pM): pending\n", tt_common_entry->addr); atomic_dec(&bat_priv->num_local_tt); hlist_del_rcu(node); tt_local_entry = container_of(tt_common_entry, struct tt_local_entry, common); batadv_tt_local_entry_free_ref(tt_local_entry); } spin_unlock_bh(list_lock); } } static int batadv_tt_commit_changes(struct bat_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, TT_CLIENT_NEW, false); /* all reset entries have to be counted as local entries */ atomic_add(changed_num, &bat_priv->num_local_tt); batadv_tt_local_purge_pending_clients(bat_priv); bat_priv->tt_crc = batadv_tt_local_crc(bat_priv); /* Increment the TTVN only once per OGM interval */ atomic_inc(&bat_priv->ttvn); batadv_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n", (uint8_t)atomic_read(&bat_priv->ttvn)); bat_priv->tt_poss_change = false; /* reset the sending counter */ atomic_set(&bat_priv->tt_ogm_append_cnt, 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 bat_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 bat_priv *bat_priv, uint8_t *src, uint8_t *dst) { struct tt_local_entry *tt_local_entry = NULL; struct 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 bat_priv *bat_priv, struct 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; /* 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 TT_OGM_APPEND_MAX times. * In this case send a tt request */ if (!tt_num_changes) { full_table = false; goto request_table; } batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn, (struct tt_change *)tt_buff); /* 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; /* Roaming phase is over: tables are in sync again. I can * unset the flag */ orig_node->tt_poss_change = false; } 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(DBG_TT, bat_priv, "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u 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 bat_priv *bat_priv, uint8_t *addr) { struct 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 & TT_CLIENT_ROAM; batadv_tt_global_entry_free_ref(tt_global_entry); out: return ret; }