1 /* Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "translation-table.h"
22 #include "soft-interface.h"
23 #include "hard-interface.h"
26 #include "originator.h"
28 #include "bridge_loop_avoidance.h"
30 #include <linux/crc16.h>
32 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
33 struct orig_node *orig_node);
34 static void tt_purge(struct work_struct *work);
35 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
37 /* returns 1 if they are the same mac addr */
38 static int compare_tt(const struct hlist_node *node, const void *data2)
40 const void *data1 = container_of(node, struct tt_common_entry,
43 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
46 static void tt_start_timer(struct bat_priv *bat_priv)
48 INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
49 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt_work,
50 msecs_to_jiffies(5000));
53 static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash,
56 struct hlist_head *head;
57 struct hlist_node *node;
58 struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
64 index = choose_orig(data, hash->size);
65 head = &hash->table[index];
68 hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
69 if (!compare_eth(tt_common_entry, data))
72 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
75 tt_common_entry_tmp = tt_common_entry;
80 return tt_common_entry_tmp;
83 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
86 struct tt_common_entry *tt_common_entry;
87 struct tt_local_entry *tt_local_entry = NULL;
89 tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
91 tt_local_entry = container_of(tt_common_entry,
92 struct tt_local_entry, common);
93 return tt_local_entry;
96 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
99 struct tt_common_entry *tt_common_entry;
100 struct tt_global_entry *tt_global_entry = NULL;
102 tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
104 tt_global_entry = container_of(tt_common_entry,
105 struct tt_global_entry, common);
106 return tt_global_entry;
110 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
112 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
113 kfree_rcu(tt_local_entry, common.rcu);
116 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
118 struct tt_common_entry *tt_common_entry;
119 struct tt_global_entry *tt_global_entry;
121 tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
122 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
125 kfree(tt_global_entry);
128 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
130 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
131 tt_global_del_orig_list(tt_global_entry);
132 call_rcu(&tt_global_entry->common.rcu,
133 tt_global_entry_free_rcu);
137 static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
139 struct tt_orig_list_entry *orig_entry;
141 orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
142 atomic_dec(&orig_entry->orig_node->tt_size);
143 batadv_orig_node_free_ref(orig_entry->orig_node);
147 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
149 call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);
152 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
155 struct tt_change_node *tt_change_node;
157 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
162 tt_change_node->change.flags = flags;
163 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
165 spin_lock_bh(&bat_priv->tt_changes_list_lock);
166 /* track the change in the OGMinterval list */
167 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
168 atomic_inc(&bat_priv->tt_local_changes);
169 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
171 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
174 int batadv_tt_len(int changes_num)
176 return changes_num * sizeof(struct tt_change);
179 static int tt_local_init(struct bat_priv *bat_priv)
181 if (bat_priv->tt_local_hash)
184 bat_priv->tt_local_hash = batadv_hash_new(1024);
186 if (!bat_priv->tt_local_hash)
192 void batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
195 struct bat_priv *bat_priv = netdev_priv(soft_iface);
196 struct tt_local_entry *tt_local_entry = NULL;
197 struct tt_global_entry *tt_global_entry = NULL;
198 struct hlist_head *head;
199 struct hlist_node *node;
200 struct tt_orig_list_entry *orig_entry;
203 tt_local_entry = tt_local_hash_find(bat_priv, addr);
205 if (tt_local_entry) {
206 tt_local_entry->last_seen = jiffies;
207 /* possibly unset the TT_CLIENT_PENDING flag */
208 tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
212 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
216 bat_dbg(DBG_TT, bat_priv,
217 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
218 (uint8_t)atomic_read(&bat_priv->ttvn));
220 memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
221 tt_local_entry->common.flags = NO_FLAGS;
222 if (batadv_is_wifi_iface(ifindex))
223 tt_local_entry->common.flags |= TT_CLIENT_WIFI;
224 atomic_set(&tt_local_entry->common.refcount, 2);
225 tt_local_entry->last_seen = jiffies;
227 /* the batman interface mac address should never be purged */
228 if (compare_eth(addr, soft_iface->dev_addr))
229 tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
231 /* The local entry has to be marked as NEW to avoid to send it in
232 * a full table response going out before the next ttvn increment
233 * (consistency check)
235 tt_local_entry->common.flags |= TT_CLIENT_NEW;
237 hash_added = batadv_hash_add(bat_priv->tt_local_hash, compare_tt,
238 choose_orig, &tt_local_entry->common,
239 &tt_local_entry->common.hash_entry);
241 if (unlikely(hash_added != 0)) {
242 /* remove the reference for the hash */
243 tt_local_entry_free_ref(tt_local_entry);
247 tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
249 /* remove address from global hash if present */
250 tt_global_entry = tt_global_hash_find(bat_priv, addr);
252 /* Check whether it is a roaming! */
253 if (tt_global_entry) {
254 /* These node are probably going to update their tt table */
255 head = &tt_global_entry->orig_list;
257 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
258 orig_entry->orig_node->tt_poss_change = true;
260 send_roam_adv(bat_priv, tt_global_entry->common.addr,
261 orig_entry->orig_node);
264 /* The global entry has to be marked as ROAMING and
265 * has to be kept for consistency purpose
267 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
268 tt_global_entry->roam_at = jiffies;
272 tt_local_entry_free_ref(tt_local_entry);
274 tt_global_entry_free_ref(tt_global_entry);
277 static void tt_realloc_packet_buff(unsigned char **packet_buff,
278 int *packet_buff_len, int min_packet_len,
281 unsigned char *new_buff;
283 new_buff = kmalloc(new_packet_len, GFP_ATOMIC);
285 /* keep old buffer if kmalloc should fail */
287 memcpy(new_buff, *packet_buff, min_packet_len);
289 *packet_buff = new_buff;
290 *packet_buff_len = new_packet_len;
294 static void tt_prepare_packet_buff(struct bat_priv *bat_priv,
295 unsigned char **packet_buff,
296 int *packet_buff_len, int min_packet_len)
298 struct hard_iface *primary_if;
301 primary_if = batadv_primary_if_get_selected(bat_priv);
303 req_len = min_packet_len;
304 req_len += batadv_tt_len(atomic_read(&bat_priv->tt_local_changes));
306 /* if we have too many changes for one packet don't send any
307 * and wait for the tt table request which will be fragmented
309 if ((!primary_if) || (req_len > primary_if->soft_iface->mtu))
310 req_len = min_packet_len;
312 tt_realloc_packet_buff(packet_buff, packet_buff_len,
313 min_packet_len, req_len);
316 batadv_hardif_free_ref(primary_if);
319 static int tt_changes_fill_buff(struct bat_priv *bat_priv,
320 unsigned char **packet_buff,
321 int *packet_buff_len, int min_packet_len)
323 struct tt_change_node *entry, *safe;
324 int count = 0, tot_changes = 0, new_len;
325 unsigned char *tt_buff;
327 tt_prepare_packet_buff(bat_priv, packet_buff,
328 packet_buff_len, min_packet_len);
330 new_len = *packet_buff_len - min_packet_len;
331 tt_buff = *packet_buff + min_packet_len;
334 tot_changes = new_len / batadv_tt_len(1);
336 spin_lock_bh(&bat_priv->tt_changes_list_lock);
337 atomic_set(&bat_priv->tt_local_changes, 0);
339 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
341 if (count < tot_changes) {
342 memcpy(tt_buff + batadv_tt_len(count),
343 &entry->change, sizeof(struct tt_change));
346 list_del(&entry->list);
349 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
351 /* Keep the buffer for possible tt_request */
352 spin_lock_bh(&bat_priv->tt_buff_lock);
353 kfree(bat_priv->tt_buff);
354 bat_priv->tt_buff_len = 0;
355 bat_priv->tt_buff = NULL;
356 /* check whether this new OGM has no changes due to size problems */
358 /* if kmalloc() fails we will reply with the full table
359 * instead of providing the diff
361 bat_priv->tt_buff = kmalloc(new_len, GFP_ATOMIC);
362 if (bat_priv->tt_buff) {
363 memcpy(bat_priv->tt_buff, tt_buff, new_len);
364 bat_priv->tt_buff_len = new_len;
367 spin_unlock_bh(&bat_priv->tt_buff_lock);
372 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
374 struct net_device *net_dev = (struct net_device *)seq->private;
375 struct bat_priv *bat_priv = netdev_priv(net_dev);
376 struct hashtable_t *hash = bat_priv->tt_local_hash;
377 struct tt_common_entry *tt_common_entry;
378 struct hard_iface *primary_if;
379 struct hlist_node *node;
380 struct hlist_head *head;
384 primary_if = batadv_primary_if_get_selected(bat_priv);
386 ret = seq_printf(seq,
387 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
392 if (primary_if->if_status != IF_ACTIVE) {
393 ret = seq_printf(seq,
394 "BATMAN mesh %s disabled - primary interface not active\n",
400 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
401 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
403 for (i = 0; i < hash->size; i++) {
404 head = &hash->table[i];
407 hlist_for_each_entry_rcu(tt_common_entry, node,
409 seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
410 tt_common_entry->addr,
411 (tt_common_entry->flags &
412 TT_CLIENT_ROAM ? 'R' : '.'),
413 (tt_common_entry->flags &
414 TT_CLIENT_NOPURGE ? 'P' : '.'),
415 (tt_common_entry->flags &
416 TT_CLIENT_NEW ? 'N' : '.'),
417 (tt_common_entry->flags &
418 TT_CLIENT_PENDING ? 'X' : '.'),
419 (tt_common_entry->flags &
420 TT_CLIENT_WIFI ? 'W' : '.'));
426 batadv_hardif_free_ref(primary_if);
430 static void tt_local_set_pending(struct bat_priv *bat_priv,
431 struct tt_local_entry *tt_local_entry,
432 uint16_t flags, const char *message)
434 tt_local_event(bat_priv, tt_local_entry->common.addr,
435 tt_local_entry->common.flags | flags);
437 /* The local client has to be marked as "pending to be removed" but has
438 * to be kept in the table in order to send it in a full table
439 * response issued before the net ttvn increment (consistency check)
441 tt_local_entry->common.flags |= TT_CLIENT_PENDING;
443 bat_dbg(DBG_TT, bat_priv,
444 "Local tt entry (%pM) pending to be removed: %s\n",
445 tt_local_entry->common.addr, message);
448 void batadv_tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
449 const char *message, bool roaming)
451 struct tt_local_entry *tt_local_entry = NULL;
453 tt_local_entry = tt_local_hash_find(bat_priv, addr);
457 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
458 (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message);
461 tt_local_entry_free_ref(tt_local_entry);
464 static void tt_local_purge(struct bat_priv *bat_priv)
466 struct hashtable_t *hash = bat_priv->tt_local_hash;
467 struct tt_local_entry *tt_local_entry;
468 struct tt_common_entry *tt_common_entry;
469 struct hlist_node *node, *node_tmp;
470 struct hlist_head *head;
471 spinlock_t *list_lock; /* protects write access to the hash lists */
474 for (i = 0; i < hash->size; i++) {
475 head = &hash->table[i];
476 list_lock = &hash->list_locks[i];
478 spin_lock_bh(list_lock);
479 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
481 tt_local_entry = container_of(tt_common_entry,
482 struct tt_local_entry,
484 if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
487 /* entry already marked for deletion */
488 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
491 if (!has_timed_out(tt_local_entry->last_seen,
495 tt_local_set_pending(bat_priv, tt_local_entry,
496 TT_CLIENT_DEL, "timed out");
498 spin_unlock_bh(list_lock);
503 static void tt_local_table_free(struct bat_priv *bat_priv)
505 struct hashtable_t *hash;
506 spinlock_t *list_lock; /* protects write access to the hash lists */
507 struct tt_common_entry *tt_common_entry;
508 struct tt_local_entry *tt_local_entry;
509 struct hlist_node *node, *node_tmp;
510 struct hlist_head *head;
513 if (!bat_priv->tt_local_hash)
516 hash = bat_priv->tt_local_hash;
518 for (i = 0; i < hash->size; i++) {
519 head = &hash->table[i];
520 list_lock = &hash->list_locks[i];
522 spin_lock_bh(list_lock);
523 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
526 tt_local_entry = container_of(tt_common_entry,
527 struct tt_local_entry,
529 tt_local_entry_free_ref(tt_local_entry);
531 spin_unlock_bh(list_lock);
534 batadv_hash_destroy(hash);
536 bat_priv->tt_local_hash = NULL;
539 static int tt_global_init(struct bat_priv *bat_priv)
541 if (bat_priv->tt_global_hash)
544 bat_priv->tt_global_hash = batadv_hash_new(1024);
546 if (!bat_priv->tt_global_hash)
552 static void tt_changes_list_free(struct bat_priv *bat_priv)
554 struct tt_change_node *entry, *safe;
556 spin_lock_bh(&bat_priv->tt_changes_list_lock);
558 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
560 list_del(&entry->list);
564 atomic_set(&bat_priv->tt_local_changes, 0);
565 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
568 /* find out if an orig_node is already in the list of a tt_global_entry.
569 * returns 1 if found, 0 otherwise
571 static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
572 const struct orig_node *orig_node)
574 struct tt_orig_list_entry *tmp_orig_entry;
575 const struct hlist_head *head;
576 struct hlist_node *node;
580 head = &entry->orig_list;
581 hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
582 if (tmp_orig_entry->orig_node == orig_node) {
591 static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
592 struct orig_node *orig_node,
595 struct tt_orig_list_entry *orig_entry;
597 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
601 INIT_HLIST_NODE(&orig_entry->list);
602 atomic_inc(&orig_node->refcount);
603 atomic_inc(&orig_node->tt_size);
604 orig_entry->orig_node = orig_node;
605 orig_entry->ttvn = ttvn;
607 spin_lock_bh(&tt_global_entry->list_lock);
608 hlist_add_head_rcu(&orig_entry->list,
609 &tt_global_entry->orig_list);
610 spin_unlock_bh(&tt_global_entry->list_lock);
613 /* caller must hold orig_node refcount */
614 int batadv_tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
615 const unsigned char *tt_addr, uint8_t ttvn,
616 bool roaming, bool wifi)
618 struct tt_global_entry *tt_global_entry = NULL;
621 struct tt_common_entry *common;
623 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
625 if (!tt_global_entry) {
626 tt_global_entry = kzalloc(sizeof(*tt_global_entry),
628 if (!tt_global_entry)
631 common = &tt_global_entry->common;
632 memcpy(common->addr, tt_addr, ETH_ALEN);
634 common->flags = NO_FLAGS;
635 tt_global_entry->roam_at = 0;
636 atomic_set(&common->refcount, 2);
638 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
639 spin_lock_init(&tt_global_entry->list_lock);
641 hash_added = batadv_hash_add(bat_priv->tt_global_hash,
642 compare_tt, choose_orig,
643 common, &common->hash_entry);
645 if (unlikely(hash_added != 0)) {
646 /* remove the reference for the hash */
647 tt_global_entry_free_ref(tt_global_entry);
651 tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
653 /* there is already a global entry, use this one. */
655 /* If there is the TT_CLIENT_ROAM flag set, there is only one
656 * originator left in the list and we previously received a
657 * delete + roaming change for this originator.
659 * We should first delete the old originator before adding the
662 if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
663 tt_global_del_orig_list(tt_global_entry);
664 tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
665 tt_global_entry->roam_at = 0;
668 if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
669 tt_global_add_orig_entry(tt_global_entry, orig_node,
674 tt_global_entry->common.flags |= TT_CLIENT_WIFI;
676 bat_dbg(DBG_TT, bat_priv,
677 "Creating new global tt entry: %pM (via %pM)\n",
678 tt_global_entry->common.addr, orig_node->orig);
681 /* remove address from local hash if present */
682 batadv_tt_local_remove(bat_priv, tt_global_entry->common.addr,
683 "global tt received", roaming);
687 tt_global_entry_free_ref(tt_global_entry);
691 /* print all orig nodes who announce the address for this global entry.
692 * it is assumed that the caller holds rcu_read_lock();
694 static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
695 struct seq_file *seq)
697 struct hlist_head *head;
698 struct hlist_node *node;
699 struct tt_orig_list_entry *orig_entry;
700 struct tt_common_entry *tt_common_entry;
704 tt_common_entry = &tt_global_entry->common;
706 head = &tt_global_entry->orig_list;
708 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
709 flags = tt_common_entry->flags;
710 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
711 seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
712 tt_global_entry->common.addr, orig_entry->ttvn,
713 orig_entry->orig_node->orig, last_ttvn,
714 (flags & TT_CLIENT_ROAM ? 'R' : '.'),
715 (flags & TT_CLIENT_WIFI ? 'W' : '.'));
719 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
721 struct net_device *net_dev = (struct net_device *)seq->private;
722 struct bat_priv *bat_priv = netdev_priv(net_dev);
723 struct hashtable_t *hash = bat_priv->tt_global_hash;
724 struct tt_common_entry *tt_common_entry;
725 struct tt_global_entry *tt_global_entry;
726 struct hard_iface *primary_if;
727 struct hlist_node *node;
728 struct hlist_head *head;
732 primary_if = batadv_primary_if_get_selected(bat_priv);
734 ret = seq_printf(seq,
735 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
740 if (primary_if->if_status != IF_ACTIVE) {
741 ret = seq_printf(seq,
742 "BATMAN mesh %s disabled - primary interface not active\n",
748 "Globally announced TT entries received via the mesh %s\n",
750 seq_printf(seq, " %-13s %s %-15s %s %s\n",
751 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
753 for (i = 0; i < hash->size; i++) {
754 head = &hash->table[i];
757 hlist_for_each_entry_rcu(tt_common_entry, node,
759 tt_global_entry = container_of(tt_common_entry,
760 struct tt_global_entry,
762 tt_global_print_entry(tt_global_entry, seq);
768 batadv_hardif_free_ref(primary_if);
772 /* deletes the orig list of a tt_global_entry */
773 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
775 struct hlist_head *head;
776 struct hlist_node *node, *safe;
777 struct tt_orig_list_entry *orig_entry;
779 spin_lock_bh(&tt_global_entry->list_lock);
780 head = &tt_global_entry->orig_list;
781 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
783 tt_orig_list_entry_free_ref(orig_entry);
785 spin_unlock_bh(&tt_global_entry->list_lock);
789 static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
790 struct tt_global_entry *tt_global_entry,
791 struct orig_node *orig_node,
794 struct hlist_head *head;
795 struct hlist_node *node, *safe;
796 struct tt_orig_list_entry *orig_entry;
798 spin_lock_bh(&tt_global_entry->list_lock);
799 head = &tt_global_entry->orig_list;
800 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
801 if (orig_entry->orig_node == orig_node) {
802 bat_dbg(DBG_TT, bat_priv,
803 "Deleting %pM from global tt entry %pM: %s\n",
804 orig_node->orig, tt_global_entry->common.addr,
807 tt_orig_list_entry_free_ref(orig_entry);
810 spin_unlock_bh(&tt_global_entry->list_lock);
813 static void tt_global_del_struct(struct bat_priv *bat_priv,
814 struct tt_global_entry *tt_global_entry,
817 bat_dbg(DBG_TT, bat_priv,
818 "Deleting global tt entry %pM: %s\n",
819 tt_global_entry->common.addr, message);
821 batadv_hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
822 tt_global_entry->common.addr);
823 tt_global_entry_free_ref(tt_global_entry);
827 /* If the client is to be deleted, we check if it is the last origantor entry
828 * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
829 * otherwise we simply remove the originator scheduled for deletion.
831 static void tt_global_del_roaming(struct bat_priv *bat_priv,
832 struct tt_global_entry *tt_global_entry,
833 struct orig_node *orig_node,
836 bool last_entry = true;
837 struct hlist_head *head;
838 struct hlist_node *node;
839 struct tt_orig_list_entry *orig_entry;
841 /* no local entry exists, case 1:
842 * Check if this is the last one or if other entries exist.
846 head = &tt_global_entry->orig_list;
847 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
848 if (orig_entry->orig_node != orig_node) {
856 /* its the last one, mark for roaming. */
857 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
858 tt_global_entry->roam_at = jiffies;
860 /* there is another entry, we can simply delete this
861 * one and can still use the other one.
863 tt_global_del_orig_entry(bat_priv, tt_global_entry,
869 static void tt_global_del(struct bat_priv *bat_priv,
870 struct orig_node *orig_node,
871 const unsigned char *addr,
872 const char *message, bool roaming)
874 struct tt_global_entry *tt_global_entry = NULL;
875 struct tt_local_entry *tt_local_entry = NULL;
877 tt_global_entry = tt_global_hash_find(bat_priv, addr);
878 if (!tt_global_entry)
882 tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
885 if (hlist_empty(&tt_global_entry->orig_list))
886 tt_global_del_struct(bat_priv, tt_global_entry,
892 /* if we are deleting a global entry due to a roam
893 * event, there are two possibilities:
894 * 1) the client roamed from node A to node B => if there
895 * is only one originator left for this client, we mark
896 * it with TT_CLIENT_ROAM, we start a timer and we
897 * wait for node B to claim it. In case of timeout
898 * the entry is purged.
900 * If there are other originators left, we directly delete
902 * 2) the client roamed to us => we can directly delete
903 * the global entry, since it is useless now.
905 tt_local_entry = tt_local_hash_find(bat_priv,
906 tt_global_entry->common.addr);
907 if (tt_local_entry) {
908 /* local entry exists, case 2: client roamed to us. */
909 tt_global_del_orig_list(tt_global_entry);
910 tt_global_del_struct(bat_priv, tt_global_entry, message);
912 /* no local entry exists, case 1: check for roaming */
913 tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
919 tt_global_entry_free_ref(tt_global_entry);
921 tt_local_entry_free_ref(tt_local_entry);
924 void batadv_tt_global_del_orig(struct bat_priv *bat_priv,
925 struct orig_node *orig_node, const char *message)
927 struct tt_global_entry *tt_global_entry;
928 struct tt_common_entry *tt_common_entry;
930 struct hashtable_t *hash = bat_priv->tt_global_hash;
931 struct hlist_node *node, *safe;
932 struct hlist_head *head;
933 spinlock_t *list_lock; /* protects write access to the hash lists */
938 for (i = 0; i < hash->size; i++) {
939 head = &hash->table[i];
940 list_lock = &hash->list_locks[i];
942 spin_lock_bh(list_lock);
943 hlist_for_each_entry_safe(tt_common_entry, node, safe,
945 tt_global_entry = container_of(tt_common_entry,
946 struct tt_global_entry,
949 tt_global_del_orig_entry(bat_priv, tt_global_entry,
952 if (hlist_empty(&tt_global_entry->orig_list)) {
953 bat_dbg(DBG_TT, bat_priv,
954 "Deleting global tt entry %pM: %s\n",
955 tt_global_entry->common.addr,
958 tt_global_entry_free_ref(tt_global_entry);
961 spin_unlock_bh(list_lock);
963 atomic_set(&orig_node->tt_size, 0);
964 orig_node->tt_initialised = false;
967 static void tt_global_roam_purge(struct bat_priv *bat_priv)
969 struct hashtable_t *hash = bat_priv->tt_global_hash;
970 struct tt_common_entry *tt_common_entry;
971 struct tt_global_entry *tt_global_entry;
972 struct hlist_node *node, *node_tmp;
973 struct hlist_head *head;
974 spinlock_t *list_lock; /* protects write access to the hash lists */
977 for (i = 0; i < hash->size; i++) {
978 head = &hash->table[i];
979 list_lock = &hash->list_locks[i];
981 spin_lock_bh(list_lock);
982 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
984 tt_global_entry = container_of(tt_common_entry,
985 struct tt_global_entry,
987 if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
989 if (!has_timed_out(tt_global_entry->roam_at,
990 TT_CLIENT_ROAM_TIMEOUT))
993 bat_dbg(DBG_TT, bat_priv,
994 "Deleting global tt entry (%pM): Roaming timeout\n",
995 tt_global_entry->common.addr);
998 tt_global_entry_free_ref(tt_global_entry);
1000 spin_unlock_bh(list_lock);
1005 static void tt_global_table_free(struct bat_priv *bat_priv)
1007 struct hashtable_t *hash;
1008 spinlock_t *list_lock; /* protects write access to the hash lists */
1009 struct tt_common_entry *tt_common_entry;
1010 struct tt_global_entry *tt_global_entry;
1011 struct hlist_node *node, *node_tmp;
1012 struct hlist_head *head;
1015 if (!bat_priv->tt_global_hash)
1018 hash = bat_priv->tt_global_hash;
1020 for (i = 0; i < hash->size; i++) {
1021 head = &hash->table[i];
1022 list_lock = &hash->list_locks[i];
1024 spin_lock_bh(list_lock);
1025 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
1027 hlist_del_rcu(node);
1028 tt_global_entry = container_of(tt_common_entry,
1029 struct tt_global_entry,
1031 tt_global_entry_free_ref(tt_global_entry);
1033 spin_unlock_bh(list_lock);
1036 batadv_hash_destroy(hash);
1038 bat_priv->tt_global_hash = NULL;
1041 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
1042 struct tt_global_entry *tt_global_entry)
1046 if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
1047 tt_global_entry->common.flags & TT_CLIENT_WIFI)
1053 struct orig_node *batadv_transtable_search(struct bat_priv *bat_priv,
1055 const uint8_t *addr)
1057 struct tt_local_entry *tt_local_entry = NULL;
1058 struct tt_global_entry *tt_global_entry = NULL;
1059 struct orig_node *orig_node = NULL;
1060 struct neigh_node *router = NULL;
1061 struct hlist_head *head;
1062 struct hlist_node *node;
1063 struct tt_orig_list_entry *orig_entry;
1066 if (src && atomic_read(&bat_priv->ap_isolation)) {
1067 tt_local_entry = tt_local_hash_find(bat_priv, src);
1068 if (!tt_local_entry)
1072 tt_global_entry = tt_global_hash_find(bat_priv, addr);
1073 if (!tt_global_entry)
1076 /* check whether the clients should not communicate due to AP
1079 if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
1085 head = &tt_global_entry->orig_list;
1086 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1087 router = batadv_orig_node_get_router(orig_entry->orig_node);
1091 if (router->tq_avg > best_tq) {
1092 orig_node = orig_entry->orig_node;
1093 best_tq = router->tq_avg;
1095 batadv_neigh_node_free_ref(router);
1097 /* found anything? */
1098 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1102 if (tt_global_entry)
1103 tt_global_entry_free_ref(tt_global_entry);
1105 tt_local_entry_free_ref(tt_local_entry);
1110 /* Calculates the checksum of the local table of a given orig_node */
1111 static uint16_t tt_global_crc(struct bat_priv *bat_priv,
1112 struct orig_node *orig_node)
1114 uint16_t total = 0, total_one;
1115 struct hashtable_t *hash = bat_priv->tt_global_hash;
1116 struct tt_common_entry *tt_common_entry;
1117 struct tt_global_entry *tt_global_entry;
1118 struct hlist_node *node;
1119 struct hlist_head *head;
1123 for (i = 0; i < hash->size; i++) {
1124 head = &hash->table[i];
1127 hlist_for_each_entry_rcu(tt_common_entry, node,
1129 tt_global_entry = container_of(tt_common_entry,
1130 struct tt_global_entry,
1132 /* Roaming clients are in the global table for
1133 * consistency only. They don't have to be
1134 * taken into account while computing the
1137 if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
1140 /* find out if this global entry is announced by this
1143 if (!tt_global_entry_has_orig(tt_global_entry,
1148 for (j = 0; j < ETH_ALEN; j++)
1149 total_one = crc16_byte(total_one,
1150 tt_global_entry->common.addr[j]);
1159 /* Calculates the checksum of the local table */
1160 static uint16_t batadv_tt_local_crc(struct bat_priv *bat_priv)
1162 uint16_t total = 0, total_one;
1163 struct hashtable_t *hash = bat_priv->tt_local_hash;
1164 struct tt_common_entry *tt_common_entry;
1165 struct hlist_node *node;
1166 struct hlist_head *head;
1170 for (i = 0; i < hash->size; i++) {
1171 head = &hash->table[i];
1174 hlist_for_each_entry_rcu(tt_common_entry, node,
1176 /* not yet committed clients have not to be taken into
1177 * account while computing the CRC
1179 if (tt_common_entry->flags & TT_CLIENT_NEW)
1182 for (j = 0; j < ETH_ALEN; j++)
1183 total_one = crc16_byte(total_one,
1184 tt_common_entry->addr[j]);
1193 static void tt_req_list_free(struct bat_priv *bat_priv)
1195 struct tt_req_node *node, *safe;
1197 spin_lock_bh(&bat_priv->tt_req_list_lock);
1199 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1200 list_del(&node->list);
1204 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1207 static void tt_save_orig_buffer(struct bat_priv *bat_priv,
1208 struct orig_node *orig_node,
1209 const unsigned char *tt_buff,
1210 uint8_t tt_num_changes)
1212 uint16_t tt_buff_len = batadv_tt_len(tt_num_changes);
1214 /* Replace the old buffer only if I received something in the
1215 * last OGM (the OGM could carry no changes)
1217 spin_lock_bh(&orig_node->tt_buff_lock);
1218 if (tt_buff_len > 0) {
1219 kfree(orig_node->tt_buff);
1220 orig_node->tt_buff_len = 0;
1221 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1222 if (orig_node->tt_buff) {
1223 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1224 orig_node->tt_buff_len = tt_buff_len;
1227 spin_unlock_bh(&orig_node->tt_buff_lock);
1230 static void tt_req_purge(struct bat_priv *bat_priv)
1232 struct tt_req_node *node, *safe;
1234 spin_lock_bh(&bat_priv->tt_req_list_lock);
1235 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1236 if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) {
1237 list_del(&node->list);
1241 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1244 /* returns the pointer to the new tt_req_node struct if no request
1245 * has already been issued for this orig_node, NULL otherwise
1247 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
1248 struct orig_node *orig_node)
1250 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1252 spin_lock_bh(&bat_priv->tt_req_list_lock);
1253 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
1254 if (compare_eth(tt_req_node_tmp, orig_node) &&
1255 !has_timed_out(tt_req_node_tmp->issued_at,
1256 TT_REQUEST_TIMEOUT))
1260 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1264 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1265 tt_req_node->issued_at = jiffies;
1267 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1269 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1273 /* data_ptr is useless here, but has to be kept to respect the prototype */
1274 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1276 const struct tt_common_entry *tt_common_entry = entry_ptr;
1278 if (tt_common_entry->flags & TT_CLIENT_NEW)
1283 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1285 const struct tt_common_entry *tt_common_entry = entry_ptr;
1286 const struct tt_global_entry *tt_global_entry;
1287 const struct orig_node *orig_node = data_ptr;
1289 if (tt_common_entry->flags & TT_CLIENT_ROAM)
1292 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
1295 return tt_global_entry_has_orig(tt_global_entry, orig_node);
1298 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1299 struct hashtable_t *hash,
1300 struct hard_iface *primary_if,
1301 int (*valid_cb)(const void *,
1305 struct tt_common_entry *tt_common_entry;
1306 struct tt_query_packet *tt_response;
1307 struct tt_change *tt_change;
1308 struct hlist_node *node;
1309 struct hlist_head *head;
1310 struct sk_buff *skb = NULL;
1311 uint16_t tt_tot, tt_count;
1312 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1315 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1316 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1317 tt_len -= tt_len % sizeof(struct tt_change);
1319 tt_tot = tt_len / sizeof(struct tt_change);
1321 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1325 skb_reserve(skb, ETH_HLEN);
1326 tt_response = (struct tt_query_packet *)skb_put(skb,
1327 tt_query_size + tt_len);
1328 tt_response->ttvn = ttvn;
1330 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1334 for (i = 0; i < hash->size; i++) {
1335 head = &hash->table[i];
1337 hlist_for_each_entry_rcu(tt_common_entry, node,
1339 if (tt_count == tt_tot)
1342 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1345 memcpy(tt_change->addr, tt_common_entry->addr,
1347 tt_change->flags = NO_FLAGS;
1355 /* store in the message the number of entries we have successfully
1358 tt_response->tt_data = htons(tt_count);
1364 static int send_tt_request(struct bat_priv *bat_priv,
1365 struct orig_node *dst_orig_node,
1366 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1368 struct sk_buff *skb = NULL;
1369 struct tt_query_packet *tt_request;
1370 struct neigh_node *neigh_node = NULL;
1371 struct hard_iface *primary_if;
1372 struct tt_req_node *tt_req_node = NULL;
1375 primary_if = batadv_primary_if_get_selected(bat_priv);
1379 /* The new tt_req will be issued only if I'm not waiting for a
1380 * reply from the same orig_node yet
1382 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1386 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1390 skb_reserve(skb, ETH_HLEN);
1392 tt_request = (struct tt_query_packet *)skb_put(skb,
1393 sizeof(struct tt_query_packet));
1395 tt_request->header.packet_type = BAT_TT_QUERY;
1396 tt_request->header.version = COMPAT_VERSION;
1397 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1398 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1399 tt_request->header.ttl = TTL;
1400 tt_request->ttvn = ttvn;
1401 tt_request->tt_data = htons(tt_crc);
1402 tt_request->flags = TT_REQUEST;
1405 tt_request->flags |= TT_FULL_TABLE;
1407 neigh_node = batadv_orig_node_get_router(dst_orig_node);
1411 bat_dbg(DBG_TT, bat_priv,
1412 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1413 dst_orig_node->orig, neigh_node->addr,
1414 (full_table ? 'F' : '.'));
1416 batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX);
1418 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1423 batadv_neigh_node_free_ref(neigh_node);
1425 batadv_hardif_free_ref(primary_if);
1428 if (ret && tt_req_node) {
1429 spin_lock_bh(&bat_priv->tt_req_list_lock);
1430 list_del(&tt_req_node->list);
1431 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1437 static bool send_other_tt_response(struct bat_priv *bat_priv,
1438 struct tt_query_packet *tt_request)
1440 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1441 struct neigh_node *neigh_node = NULL;
1442 struct hard_iface *primary_if = NULL;
1443 uint8_t orig_ttvn, req_ttvn, ttvn;
1445 unsigned char *tt_buff;
1447 uint16_t tt_len, tt_tot;
1448 struct sk_buff *skb = NULL;
1449 struct tt_query_packet *tt_response;
1451 bat_dbg(DBG_TT, bat_priv,
1452 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1453 tt_request->src, tt_request->ttvn, tt_request->dst,
1454 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1456 /* Let's get the orig node of the REAL destination */
1457 req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst);
1458 if (!req_dst_orig_node)
1461 res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src);
1462 if (!res_dst_orig_node)
1465 neigh_node = batadv_orig_node_get_router(res_dst_orig_node);
1469 primary_if = batadv_primary_if_get_selected(bat_priv);
1473 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1474 req_ttvn = tt_request->ttvn;
1476 /* I don't have the requested data */
1477 if (orig_ttvn != req_ttvn ||
1478 tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
1481 /* If the full table has been explicitly requested */
1482 if (tt_request->flags & TT_FULL_TABLE ||
1483 !req_dst_orig_node->tt_buff)
1488 /* In this version, fragmentation is not implemented, then
1489 * I'll send only one packet with as much TT entries as I can
1492 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1493 tt_len = req_dst_orig_node->tt_buff_len;
1494 tt_tot = tt_len / sizeof(struct tt_change);
1496 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1501 skb_reserve(skb, ETH_HLEN);
1502 tt_response = (struct tt_query_packet *)skb_put(skb,
1503 sizeof(struct tt_query_packet) + tt_len);
1504 tt_response->ttvn = req_ttvn;
1505 tt_response->tt_data = htons(tt_tot);
1507 tt_buff = skb->data + sizeof(struct tt_query_packet);
1508 /* Copy the last orig_node's OGM buffer */
1509 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1510 req_dst_orig_node->tt_buff_len);
1512 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1514 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1515 sizeof(struct tt_change);
1516 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1518 skb = tt_response_fill_table(tt_len, ttvn,
1519 bat_priv->tt_global_hash,
1520 primary_if, tt_global_valid_entry,
1525 tt_response = (struct tt_query_packet *)skb->data;
1528 tt_response->header.packet_type = BAT_TT_QUERY;
1529 tt_response->header.version = COMPAT_VERSION;
1530 tt_response->header.ttl = TTL;
1531 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1532 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1533 tt_response->flags = TT_RESPONSE;
1536 tt_response->flags |= TT_FULL_TABLE;
1538 bat_dbg(DBG_TT, bat_priv,
1539 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1540 res_dst_orig_node->orig, neigh_node->addr,
1541 req_dst_orig_node->orig, req_ttvn);
1543 batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1545 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1550 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1553 if (res_dst_orig_node)
1554 batadv_orig_node_free_ref(res_dst_orig_node);
1555 if (req_dst_orig_node)
1556 batadv_orig_node_free_ref(req_dst_orig_node);
1558 batadv_neigh_node_free_ref(neigh_node);
1560 batadv_hardif_free_ref(primary_if);
1566 static bool send_my_tt_response(struct bat_priv *bat_priv,
1567 struct tt_query_packet *tt_request)
1569 struct orig_node *orig_node = NULL;
1570 struct neigh_node *neigh_node = NULL;
1571 struct hard_iface *primary_if = NULL;
1572 uint8_t my_ttvn, req_ttvn, ttvn;
1574 unsigned char *tt_buff;
1576 uint16_t tt_len, tt_tot;
1577 struct sk_buff *skb = NULL;
1578 struct tt_query_packet *tt_response;
1580 bat_dbg(DBG_TT, bat_priv,
1581 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1582 tt_request->src, tt_request->ttvn,
1583 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1586 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1587 req_ttvn = tt_request->ttvn;
1589 orig_node = orig_hash_find(bat_priv, tt_request->src);
1593 neigh_node = batadv_orig_node_get_router(orig_node);
1597 primary_if = batadv_primary_if_get_selected(bat_priv);
1601 /* If the full table has been explicitly requested or the gap
1602 * is too big send the whole local translation table
1604 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1610 /* In this version, fragmentation is not implemented, then
1611 * I'll send only one packet with as much TT entries as I can
1614 spin_lock_bh(&bat_priv->tt_buff_lock);
1615 tt_len = bat_priv->tt_buff_len;
1616 tt_tot = tt_len / sizeof(struct tt_change);
1618 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1623 skb_reserve(skb, ETH_HLEN);
1624 tt_response = (struct tt_query_packet *)skb_put(skb,
1625 sizeof(struct tt_query_packet) + tt_len);
1626 tt_response->ttvn = req_ttvn;
1627 tt_response->tt_data = htons(tt_tot);
1629 tt_buff = skb->data + sizeof(struct tt_query_packet);
1630 memcpy(tt_buff, bat_priv->tt_buff,
1631 bat_priv->tt_buff_len);
1632 spin_unlock_bh(&bat_priv->tt_buff_lock);
1634 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1635 sizeof(struct tt_change);
1636 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1638 skb = tt_response_fill_table(tt_len, ttvn,
1639 bat_priv->tt_local_hash,
1640 primary_if, tt_local_valid_entry,
1645 tt_response = (struct tt_query_packet *)skb->data;
1648 tt_response->header.packet_type = BAT_TT_QUERY;
1649 tt_response->header.version = COMPAT_VERSION;
1650 tt_response->header.ttl = TTL;
1651 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1652 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1653 tt_response->flags = TT_RESPONSE;
1656 tt_response->flags |= TT_FULL_TABLE;
1658 bat_dbg(DBG_TT, bat_priv,
1659 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1660 orig_node->orig, neigh_node->addr,
1661 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1663 batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1665 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1670 spin_unlock_bh(&bat_priv->tt_buff_lock);
1673 batadv_orig_node_free_ref(orig_node);
1675 batadv_neigh_node_free_ref(neigh_node);
1677 batadv_hardif_free_ref(primary_if);
1680 /* This packet was for me, so it doesn't need to be re-routed */
1684 bool batadv_send_tt_response(struct bat_priv *bat_priv,
1685 struct tt_query_packet *tt_request)
1687 if (batadv_is_my_mac(tt_request->dst)) {
1688 /* don't answer backbone gws! */
1689 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1692 return send_my_tt_response(bat_priv, tt_request);
1694 return send_other_tt_response(bat_priv, tt_request);
1698 static void _tt_update_changes(struct bat_priv *bat_priv,
1699 struct orig_node *orig_node,
1700 struct tt_change *tt_change,
1701 uint16_t tt_num_changes, uint8_t ttvn)
1706 for (i = 0; i < tt_num_changes; i++) {
1707 if ((tt_change + i)->flags & TT_CLIENT_DEL) {
1708 tt_global_del(bat_priv, orig_node,
1709 (tt_change + i)->addr,
1710 "tt removed by changes",
1711 (tt_change + i)->flags & TT_CLIENT_ROAM);
1713 is_wifi = (tt_change + i)->flags & TT_CLIENT_WIFI;
1714 if (!batadv_tt_global_add(bat_priv, orig_node,
1715 (tt_change + i)->addr, ttvn,
1717 /* In case of problem while storing a
1718 * global_entry, we stop the updating
1719 * procedure without committing the
1720 * ttvn change. This will avoid to send
1721 * corrupted data on tt_request
1726 orig_node->tt_initialised = true;
1729 static void tt_fill_gtable(struct bat_priv *bat_priv,
1730 struct tt_query_packet *tt_response)
1732 struct orig_node *orig_node = NULL;
1734 orig_node = orig_hash_find(bat_priv, tt_response->src);
1738 /* Purge the old table first.. */
1739 batadv_tt_global_del_orig(bat_priv, orig_node, "Received full table");
1741 _tt_update_changes(bat_priv, orig_node,
1742 (struct tt_change *)(tt_response + 1),
1743 ntohs(tt_response->tt_data), tt_response->ttvn);
1745 spin_lock_bh(&orig_node->tt_buff_lock);
1746 kfree(orig_node->tt_buff);
1747 orig_node->tt_buff_len = 0;
1748 orig_node->tt_buff = NULL;
1749 spin_unlock_bh(&orig_node->tt_buff_lock);
1751 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1755 batadv_orig_node_free_ref(orig_node);
1758 static void tt_update_changes(struct bat_priv *bat_priv,
1759 struct orig_node *orig_node,
1760 uint16_t tt_num_changes, uint8_t ttvn,
1761 struct tt_change *tt_change)
1763 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1766 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1768 atomic_set(&orig_node->last_ttvn, ttvn);
1771 bool batadv_is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1773 struct tt_local_entry *tt_local_entry = NULL;
1776 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1777 if (!tt_local_entry)
1779 /* Check if the client has been logically deleted (but is kept for
1780 * consistency purpose)
1782 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
1787 tt_local_entry_free_ref(tt_local_entry);
1791 void batadv_handle_tt_response(struct bat_priv *bat_priv,
1792 struct tt_query_packet *tt_response)
1794 struct tt_req_node *node, *safe;
1795 struct orig_node *orig_node = NULL;
1797 bat_dbg(DBG_TT, bat_priv,
1798 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1799 tt_response->src, tt_response->ttvn,
1800 ntohs(tt_response->tt_data),
1801 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1803 /* we should have never asked a backbone gw */
1804 if (batadv_bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1807 orig_node = orig_hash_find(bat_priv, tt_response->src);
1811 if (tt_response->flags & TT_FULL_TABLE)
1812 tt_fill_gtable(bat_priv, tt_response);
1814 tt_update_changes(bat_priv, orig_node,
1815 ntohs(tt_response->tt_data),
1817 (struct tt_change *)(tt_response + 1));
1819 /* Delete the tt_req_node from pending tt_requests list */
1820 spin_lock_bh(&bat_priv->tt_req_list_lock);
1821 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1822 if (!compare_eth(node->addr, tt_response->src))
1824 list_del(&node->list);
1827 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1829 /* Recalculate the CRC for this orig_node and store it */
1830 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1831 /* Roaming phase is over: tables are in sync again. I can
1834 orig_node->tt_poss_change = false;
1837 batadv_orig_node_free_ref(orig_node);
1840 int batadv_tt_init(struct bat_priv *bat_priv)
1844 ret = tt_local_init(bat_priv);
1848 ret = tt_global_init(bat_priv);
1852 tt_start_timer(bat_priv);
1857 static void tt_roam_list_free(struct bat_priv *bat_priv)
1859 struct tt_roam_node *node, *safe;
1861 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1863 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1864 list_del(&node->list);
1868 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1871 static void tt_roam_purge(struct bat_priv *bat_priv)
1873 struct tt_roam_node *node, *safe;
1875 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1876 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1877 if (!has_timed_out(node->first_time, ROAMING_MAX_TIME))
1880 list_del(&node->list);
1883 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1886 /* This function checks whether the client already reached the
1887 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1890 * returns true if the ROAMING_ADV can be sent, false otherwise
1892 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1895 struct tt_roam_node *tt_roam_node;
1898 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1899 /* The new tt_req will be issued only if I'm not waiting for a
1900 * reply from the same orig_node yet
1902 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1903 if (!compare_eth(tt_roam_node->addr, client))
1906 if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME))
1909 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1910 /* Sorry, you roamed too many times! */
1917 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1921 tt_roam_node->first_time = jiffies;
1922 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1923 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1925 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1930 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1934 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1935 struct orig_node *orig_node)
1937 struct neigh_node *neigh_node = NULL;
1938 struct sk_buff *skb = NULL;
1939 struct roam_adv_packet *roam_adv_packet;
1941 struct hard_iface *primary_if;
1943 /* before going on we have to check whether the client has
1944 * already roamed to us too many times
1946 if (!tt_check_roam_count(bat_priv, client))
1949 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1953 skb_reserve(skb, ETH_HLEN);
1955 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1956 sizeof(struct roam_adv_packet));
1958 roam_adv_packet->header.packet_type = BAT_ROAM_ADV;
1959 roam_adv_packet->header.version = COMPAT_VERSION;
1960 roam_adv_packet->header.ttl = TTL;
1961 primary_if = batadv_primary_if_get_selected(bat_priv);
1964 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1965 batadv_hardif_free_ref(primary_if);
1966 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1967 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1969 neigh_node = batadv_orig_node_get_router(orig_node);
1973 bat_dbg(DBG_TT, bat_priv,
1974 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1975 orig_node->orig, client, neigh_node->addr);
1977 batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX);
1979 batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1984 batadv_neigh_node_free_ref(neigh_node);
1990 static void tt_purge(struct work_struct *work)
1992 struct delayed_work *delayed_work =
1993 container_of(work, struct delayed_work, work);
1994 struct bat_priv *bat_priv =
1995 container_of(delayed_work, struct bat_priv, tt_work);
1997 tt_local_purge(bat_priv);
1998 tt_global_roam_purge(bat_priv);
1999 tt_req_purge(bat_priv);
2000 tt_roam_purge(bat_priv);
2002 tt_start_timer(bat_priv);
2005 void batadv_tt_free(struct bat_priv *bat_priv)
2007 cancel_delayed_work_sync(&bat_priv->tt_work);
2009 tt_local_table_free(bat_priv);
2010 tt_global_table_free(bat_priv);
2011 tt_req_list_free(bat_priv);
2012 tt_changes_list_free(bat_priv);
2013 tt_roam_list_free(bat_priv);
2015 kfree(bat_priv->tt_buff);
2018 /* This function will enable or disable the specified flags for all the entries
2019 * in the given hash table and returns the number of modified entries
2021 static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
2025 uint16_t changed_num = 0;
2026 struct hlist_head *head;
2027 struct hlist_node *node;
2028 struct tt_common_entry *tt_common_entry;
2033 for (i = 0; i < hash->size; i++) {
2034 head = &hash->table[i];
2037 hlist_for_each_entry_rcu(tt_common_entry, node,
2040 if ((tt_common_entry->flags & flags) == flags)
2042 tt_common_entry->flags |= flags;
2044 if (!(tt_common_entry->flags & flags))
2046 tt_common_entry->flags &= ~flags;
2056 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
2057 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
2059 struct hashtable_t *hash = bat_priv->tt_local_hash;
2060 struct tt_common_entry *tt_common_entry;
2061 struct tt_local_entry *tt_local_entry;
2062 struct hlist_node *node, *node_tmp;
2063 struct hlist_head *head;
2064 spinlock_t *list_lock; /* protects write access to the hash lists */
2070 for (i = 0; i < hash->size; i++) {
2071 head = &hash->table[i];
2072 list_lock = &hash->list_locks[i];
2074 spin_lock_bh(list_lock);
2075 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
2077 if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
2080 bat_dbg(DBG_TT, bat_priv,
2081 "Deleting local tt entry (%pM): pending\n",
2082 tt_common_entry->addr);
2084 atomic_dec(&bat_priv->num_local_tt);
2085 hlist_del_rcu(node);
2086 tt_local_entry = container_of(tt_common_entry,
2087 struct tt_local_entry,
2089 tt_local_entry_free_ref(tt_local_entry);
2091 spin_unlock_bh(list_lock);
2096 static int tt_commit_changes(struct bat_priv *bat_priv,
2097 unsigned char **packet_buff, int *packet_buff_len,
2100 uint16_t changed_num = 0;
2102 if (atomic_read(&bat_priv->tt_local_changes) < 1)
2105 changed_num = tt_set_flags(bat_priv->tt_local_hash,
2106 TT_CLIENT_NEW, false);
2108 /* all reset entries have to be counted as local entries */
2109 atomic_add(changed_num, &bat_priv->num_local_tt);
2110 tt_local_purge_pending_clients(bat_priv);
2111 bat_priv->tt_crc = batadv_tt_local_crc(bat_priv);
2113 /* Increment the TTVN only once per OGM interval */
2114 atomic_inc(&bat_priv->ttvn);
2115 bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
2116 (uint8_t)atomic_read(&bat_priv->ttvn));
2117 bat_priv->tt_poss_change = false;
2119 /* reset the sending counter */
2120 atomic_set(&bat_priv->tt_ogm_append_cnt, TT_OGM_APPEND_MAX);
2122 return tt_changes_fill_buff(bat_priv, packet_buff,
2123 packet_buff_len, packet_min_len);
2126 /* when calling this function (hard_iface == primary_if) has to be true */
2127 int batadv_tt_append_diff(struct bat_priv *bat_priv,
2128 unsigned char **packet_buff, int *packet_buff_len,
2133 /* if at least one change happened */
2134 tt_num_changes = tt_commit_changes(bat_priv, packet_buff,
2135 packet_buff_len, packet_min_len);
2137 /* if the changes have been sent often enough */
2138 if ((tt_num_changes < 0) &&
2139 (!atomic_dec_not_zero(&bat_priv->tt_ogm_append_cnt))) {
2140 tt_realloc_packet_buff(packet_buff, packet_buff_len,
2141 packet_min_len, packet_min_len);
2145 return tt_num_changes;
2148 bool batadv_is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src,
2151 struct tt_local_entry *tt_local_entry = NULL;
2152 struct tt_global_entry *tt_global_entry = NULL;
2155 if (!atomic_read(&bat_priv->ap_isolation))
2158 tt_local_entry = tt_local_hash_find(bat_priv, dst);
2159 if (!tt_local_entry)
2162 tt_global_entry = tt_global_hash_find(bat_priv, src);
2163 if (!tt_global_entry)
2166 if (_is_ap_isolated(tt_local_entry, tt_global_entry))
2172 if (tt_global_entry)
2173 tt_global_entry_free_ref(tt_global_entry);
2175 tt_local_entry_free_ref(tt_local_entry);
2179 void batadv_tt_update_orig(struct bat_priv *bat_priv,
2180 struct orig_node *orig_node,
2181 const unsigned char *tt_buff, uint8_t tt_num_changes,
2182 uint8_t ttvn, uint16_t tt_crc)
2184 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2185 bool full_table = true;
2187 /* don't care about a backbone gateways updates. */
2188 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2191 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2192 * increased by one -> we can apply the attached changes
2194 if ((!orig_node->tt_initialised && ttvn == 1) ||
2195 ttvn - orig_ttvn == 1) {
2196 /* the OGM could not contain the changes due to their size or
2197 * because they have already been sent TT_OGM_APPEND_MAX times.
2198 * In this case send a tt request
2200 if (!tt_num_changes) {
2205 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
2206 (struct tt_change *)tt_buff);
2208 /* Even if we received the precomputed crc with the OGM, we
2209 * prefer to recompute it to spot any possible inconsistency
2210 * in the global table
2212 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
2214 /* The ttvn alone is not enough to guarantee consistency
2215 * because a single value could represent different states
2216 * (due to the wrap around). Thus a node has to check whether
2217 * the resulting table (after applying the changes) is still
2218 * consistent or not. E.g. a node could disconnect while its
2219 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2220 * checking the CRC value is mandatory to detect the
2223 if (orig_node->tt_crc != tt_crc)
2226 /* Roaming phase is over: tables are in sync again. I can
2229 orig_node->tt_poss_change = false;
2231 /* if we missed more than one change or our tables are not
2232 * in sync anymore -> request fresh tt data
2234 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2235 orig_node->tt_crc != tt_crc) {
2237 bat_dbg(DBG_TT, bat_priv,
2238 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2239 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2240 orig_node->tt_crc, tt_num_changes);
2241 send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
2248 /* returns true whether we know that the client has moved from its old
2249 * originator to another one. This entry is kept is still kept for consistency
2252 bool batadv_tt_global_client_is_roaming(struct bat_priv *bat_priv,
2255 struct tt_global_entry *tt_global_entry;
2258 tt_global_entry = tt_global_hash_find(bat_priv, addr);
2259 if (!tt_global_entry)
2262 ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
2263 tt_global_entry_free_ref(tt_global_entry);