1 /* Copyright (C) 2007-2014 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, see <http://www.gnu.org/licenses/>.
19 #include "translation-table.h"
20 #include "soft-interface.h"
21 #include "hard-interface.h"
24 #include "originator.h"
26 #include "bridge_loop_avoidance.h"
27 #include "multicast.h"
29 #include <linux/crc32c.h>
32 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
33 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
35 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
37 struct batadv_orig_node *orig_node);
38 static void batadv_tt_purge(struct work_struct *work);
40 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
41 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
42 struct batadv_orig_node *orig_node,
43 const unsigned char *addr,
44 unsigned short vid, const char *message,
47 /* returns 1 if they are the same mac addr */
48 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
50 const void *data1 = container_of(node, struct batadv_tt_common_entry,
53 return batadv_compare_eth(data1, data2);
57 * batadv_choose_tt - return the index of the tt entry in the hash table
58 * @data: pointer to the tt_common_entry object to map
59 * @size: the size of the hash table
61 * Returns the hash index where the object represented by 'data' should be
64 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
66 struct batadv_tt_common_entry *tt;
69 tt = (struct batadv_tt_common_entry *)data;
70 hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
71 hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
81 * batadv_tt_hash_find - look for a client in the given hash table
82 * @hash: the hash table to search
83 * @addr: the mac address of the client to look for
84 * @vid: VLAN identifier
86 * Returns a pointer to the tt_common struct belonging to the searched client if
87 * found, NULL otherwise.
89 static struct batadv_tt_common_entry *
90 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
93 struct hlist_head *head;
94 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
100 ether_addr_copy(to_search.addr, addr);
103 index = batadv_choose_tt(&to_search, hash->size);
104 head = &hash->table[index];
107 hlist_for_each_entry_rcu(tt, head, hash_entry) {
108 if (!batadv_compare_eth(tt, addr))
114 if (!atomic_inc_not_zero(&tt->refcount))
126 * batadv_tt_local_hash_find - search the local table for a given client
127 * @bat_priv: the bat priv with all the soft interface information
128 * @addr: the mac address of the client to look for
129 * @vid: VLAN identifier
131 * Returns a pointer to the corresponding tt_local_entry struct if the client is
132 * found, NULL otherwise.
134 static struct batadv_tt_local_entry *
135 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
138 struct batadv_tt_common_entry *tt_common_entry;
139 struct batadv_tt_local_entry *tt_local_entry = NULL;
141 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
144 tt_local_entry = container_of(tt_common_entry,
145 struct batadv_tt_local_entry,
147 return tt_local_entry;
151 * batadv_tt_global_hash_find - search the global table for a given client
152 * @bat_priv: the bat priv with all the soft interface information
153 * @addr: the mac address of the client to look for
154 * @vid: VLAN identifier
156 * Returns a pointer to the corresponding tt_global_entry struct if the client
157 * is found, NULL otherwise.
159 static struct batadv_tt_global_entry *
160 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
163 struct batadv_tt_common_entry *tt_common_entry;
164 struct batadv_tt_global_entry *tt_global_entry = NULL;
166 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
169 tt_global_entry = container_of(tt_common_entry,
170 struct batadv_tt_global_entry,
172 return tt_global_entry;
176 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
178 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
179 kfree_rcu(tt_local_entry, common.rcu);
183 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
184 * tt_global_entry and possibly free it
185 * @tt_global_entry: the object to free
188 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
190 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
191 batadv_tt_global_del_orig_list(tt_global_entry);
192 kfree_rcu(tt_global_entry, common.rcu);
196 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
198 struct batadv_tt_orig_list_entry *orig_entry;
200 orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
202 /* We are in an rcu callback here, therefore we cannot use
203 * batadv_orig_node_free_ref() and its call_rcu():
204 * An rcu_barrier() wouldn't wait for that to finish
206 batadv_orig_node_free_ref_now(orig_entry->orig_node);
211 * batadv_tt_local_size_mod - change the size by v of the local table identified
213 * @bat_priv: the bat priv with all the soft interface information
214 * @vid: the VLAN identifier of the sub-table to change
215 * @v: the amount to sum to the local table size
217 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
218 unsigned short vid, int v)
220 struct batadv_softif_vlan *vlan;
222 vlan = batadv_softif_vlan_get(bat_priv, vid);
226 atomic_add(v, &vlan->tt.num_entries);
228 batadv_softif_vlan_free_ref(vlan);
232 * batadv_tt_local_size_inc - increase by one the local table size for the given
234 * @bat_priv: the bat priv with all the soft interface information
235 * @vid: the VLAN identifier
237 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
240 batadv_tt_local_size_mod(bat_priv, vid, 1);
244 * batadv_tt_local_size_dec - decrease by one the local table size for the given
246 * @bat_priv: the bat priv with all the soft interface information
247 * @vid: the VLAN identifier
249 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
252 batadv_tt_local_size_mod(bat_priv, vid, -1);
256 * batadv_tt_global_size_mod - change the size by v of the local table
258 * @bat_priv: the bat priv with all the soft interface information
259 * @vid: the VLAN identifier
260 * @v: the amount to sum to the global table size
262 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
263 unsigned short vid, int v)
265 struct batadv_orig_node_vlan *vlan;
267 vlan = batadv_orig_node_vlan_new(orig_node, vid);
271 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
272 spin_lock_bh(&orig_node->vlan_list_lock);
273 list_del_rcu(&vlan->list);
274 spin_unlock_bh(&orig_node->vlan_list_lock);
275 batadv_orig_node_vlan_free_ref(vlan);
278 batadv_orig_node_vlan_free_ref(vlan);
282 * batadv_tt_global_size_inc - increase by one the global table size for the
284 * @orig_node: the originator which global table size has to be decreased
285 * @vid: the vlan identifier
287 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
290 batadv_tt_global_size_mod(orig_node, vid, 1);
294 * batadv_tt_global_size_dec - decrease by one the global table size for the
296 * @orig_node: the originator which global table size has to be decreased
297 * @vid: the vlan identifier
299 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
302 batadv_tt_global_size_mod(orig_node, vid, -1);
306 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
308 if (!atomic_dec_and_test(&orig_entry->refcount))
311 call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
315 * batadv_tt_local_event - store a local TT event (ADD/DEL)
316 * @bat_priv: the bat priv with all the soft interface information
317 * @tt_local_entry: the TT entry involved in the event
318 * @event_flags: flags to store in the event structure
320 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
321 struct batadv_tt_local_entry *tt_local_entry,
324 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
325 struct batadv_tt_common_entry *common = &tt_local_entry->common;
326 uint8_t flags = common->flags | event_flags;
327 bool event_removed = false;
328 bool del_op_requested, del_op_entry;
330 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
334 tt_change_node->change.flags = flags;
335 memset(tt_change_node->change.reserved, 0,
336 sizeof(tt_change_node->change.reserved));
337 ether_addr_copy(tt_change_node->change.addr, common->addr);
338 tt_change_node->change.vid = htons(common->vid);
340 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
342 /* check for ADD+DEL or DEL+ADD events */
343 spin_lock_bh(&bat_priv->tt.changes_list_lock);
344 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
346 if (!batadv_compare_eth(entry->change.addr, common->addr))
349 /* DEL+ADD in the same orig interval have no effect and can be
350 * removed to avoid silly behaviour on the receiver side. The
351 * other way around (ADD+DEL) can happen in case of roaming of
352 * a client still in the NEW state. Roaming of NEW clients is
353 * now possible due to automatically recognition of "temporary"
356 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
357 if (!del_op_requested && del_op_entry)
359 if (del_op_requested && !del_op_entry)
362 /* this is a second add in the same originator interval. It
363 * means that flags have been changed: update them!
365 if (!del_op_requested && !del_op_entry)
366 entry->change.flags = flags;
370 list_del(&entry->list);
372 kfree(tt_change_node);
373 event_removed = true;
377 /* track the change in the OGMinterval list */
378 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
381 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
384 atomic_dec(&bat_priv->tt.local_changes);
386 atomic_inc(&bat_priv->tt.local_changes);
390 * batadv_tt_len - compute length in bytes of given number of tt changes
391 * @changes_num: number of tt changes
393 * Returns computed length in bytes.
395 static int batadv_tt_len(int changes_num)
397 return changes_num * sizeof(struct batadv_tvlv_tt_change);
401 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
402 * @tt_len: available space
404 * Returns the number of entries.
406 static uint16_t batadv_tt_entries(uint16_t tt_len)
408 return tt_len / batadv_tt_len(1);
412 * batadv_tt_local_table_transmit_size - calculates the local translation table
413 * size when transmitted over the air
414 * @bat_priv: the bat priv with all the soft interface information
416 * Returns local translation table size in bytes.
418 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
420 uint16_t num_vlan = 0, tt_local_entries = 0;
421 struct batadv_softif_vlan *vlan;
425 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
427 tt_local_entries += atomic_read(&vlan->tt.num_entries);
431 /* header size of tvlv encapsulated tt response payload */
432 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
433 hdr_size += sizeof(struct batadv_tvlv_hdr);
434 hdr_size += sizeof(struct batadv_tvlv_tt_data);
435 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
437 return hdr_size + batadv_tt_len(tt_local_entries);
440 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
442 if (bat_priv->tt.local_hash)
445 bat_priv->tt.local_hash = batadv_hash_new(1024);
447 if (!bat_priv->tt.local_hash)
450 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
451 &batadv_tt_local_hash_lock_class_key);
456 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
457 struct batadv_tt_global_entry *tt_global,
460 batadv_dbg(BATADV_DBG_TT, bat_priv,
461 "Deleting global tt entry %pM (vid: %d): %s\n",
462 tt_global->common.addr,
463 BATADV_PRINT_VID(tt_global->common.vid), message);
465 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
466 batadv_choose_tt, &tt_global->common);
467 batadv_tt_global_entry_free_ref(tt_global);
471 * batadv_tt_local_add - add a new client to the local table or update an
473 * @soft_iface: netdev struct of the mesh interface
474 * @addr: the mac address of the client to add
475 * @vid: VLAN identifier
476 * @ifindex: index of the interface where the client is connected to (useful to
477 * identify wireless clients)
478 * @mark: the value contained in the skb->mark field of the received packet (if
481 * Returns true if the client was successfully added, false otherwise.
483 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
484 unsigned short vid, int ifindex, uint32_t mark)
486 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
487 struct batadv_tt_local_entry *tt_local;
488 struct batadv_tt_global_entry *tt_global = NULL;
489 struct net_device *in_dev = NULL;
490 struct hlist_head *head;
491 struct batadv_tt_orig_list_entry *orig_entry;
492 int hash_added, table_size, packet_size_max;
493 bool ret = false, roamed_back = false;
494 uint8_t remote_flags;
497 if (ifindex != BATADV_NULL_IFINDEX)
498 in_dev = dev_get_by_index(&init_net, ifindex);
500 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
502 if (!is_multicast_ether_addr(addr))
503 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
506 tt_local->last_seen = jiffies;
507 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
508 batadv_dbg(BATADV_DBG_TT, bat_priv,
509 "Re-adding pending client %pM (vid: %d)\n",
510 addr, BATADV_PRINT_VID(vid));
511 /* whatever the reason why the PENDING flag was set,
512 * this is a client which was enqueued to be removed in
513 * this orig_interval. Since it popped up again, the
514 * flag can be reset like it was never enqueued
516 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
520 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
521 batadv_dbg(BATADV_DBG_TT, bat_priv,
522 "Roaming client %pM (vid: %d) came back to its original location\n",
523 addr, BATADV_PRINT_VID(vid));
524 /* the ROAM flag is set because this client roamed away
525 * and the node got a roaming_advertisement message. Now
526 * that the client popped up again at its original
527 * location such flag can be unset
529 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
535 /* Ignore the client if we cannot send it in a full table response. */
536 table_size = batadv_tt_local_table_transmit_size(bat_priv);
537 table_size += batadv_tt_len(1);
538 packet_size_max = atomic_read(&bat_priv->packet_size_max);
539 if (table_size > packet_size_max) {
540 net_ratelimited_function(batadv_info, soft_iface,
541 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
542 table_size, packet_size_max, addr);
546 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
550 batadv_dbg(BATADV_DBG_TT, bat_priv,
551 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
552 addr, BATADV_PRINT_VID(vid),
553 (uint8_t)atomic_read(&bat_priv->tt.vn));
555 ether_addr_copy(tt_local->common.addr, addr);
556 /* The local entry has to be marked as NEW to avoid to send it in
557 * a full table response going out before the next ttvn increment
558 * (consistency check)
560 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
561 tt_local->common.vid = vid;
562 if (batadv_is_wifi_netdev(in_dev))
563 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
564 atomic_set(&tt_local->common.refcount, 2);
565 tt_local->last_seen = jiffies;
566 tt_local->common.added_at = tt_local->last_seen;
568 /* the batman interface mac and multicast addresses should never be
571 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
572 is_multicast_ether_addr(addr))
573 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
575 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
576 batadv_choose_tt, &tt_local->common,
577 &tt_local->common.hash_entry);
579 if (unlikely(hash_added != 0)) {
580 /* remove the reference for the hash */
581 batadv_tt_local_entry_free_ref(tt_local);
586 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
589 /* Check whether it is a roaming, but don't do anything if the roaming
590 * process has already been handled
592 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
593 /* These node are probably going to update their tt table */
594 head = &tt_global->orig_list;
596 hlist_for_each_entry_rcu(orig_entry, head, list) {
597 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
598 tt_global->common.vid,
599 orig_entry->orig_node);
603 batadv_tt_global_free(bat_priv, tt_global,
607 /* The global entry has to be marked as ROAMING and
608 * has to be kept for consistency purpose
610 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
611 tt_global->roam_at = jiffies;
615 /* store the current remote flags before altering them. This helps
616 * understanding is flags are changing or not
618 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
620 if (batadv_is_wifi_netdev(in_dev))
621 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
623 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
625 /* check the mark in the skb: if it's equal to the configured
626 * isolation_mark, it means the packet is coming from an isolated
629 match_mark = (mark & bat_priv->isolation_mark_mask);
630 if (bat_priv->isolation_mark_mask &&
631 match_mark == bat_priv->isolation_mark)
632 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
634 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
636 /* if any "dynamic" flag has been modified, resend an ADD event for this
637 * entry so that all the nodes can get the new flags
639 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
640 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
647 batadv_tt_local_entry_free_ref(tt_local);
649 batadv_tt_global_entry_free_ref(tt_global);
654 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
655 * within a TT Response directed to another node
656 * @orig_node: originator for which the TT data has to be prepared
657 * @tt_data: uninitialised pointer to the address of the TVLV buffer
658 * @tt_change: uninitialised pointer to the address of the area where the TT
659 * changed can be stored
660 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
661 * function reserves the amount of space needed to send the entire global TT
662 * table. In case of success the value is updated with the real amount of
665 * Allocate the needed amount of memory for the entire TT TVLV and write its
666 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
667 * objects, one per active VLAN served by the originator node.
669 * Return the size of the allocated buffer or 0 in case of failure.
672 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
673 struct batadv_tvlv_tt_data **tt_data,
674 struct batadv_tvlv_tt_change **tt_change,
677 uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
678 struct batadv_tvlv_tt_vlan_data *tt_vlan;
679 struct batadv_orig_node_vlan *vlan;
680 uint8_t *tt_change_ptr;
683 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
685 num_entries += atomic_read(&vlan->tt.num_entries);
688 change_offset = sizeof(**tt_data);
689 change_offset += num_vlan * sizeof(*tt_vlan);
691 /* if tt_len is negative, allocate the space needed by the full table */
693 *tt_len = batadv_tt_len(num_entries);
696 tvlv_len += change_offset;
698 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
704 (*tt_data)->flags = BATADV_NO_FLAGS;
705 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
706 (*tt_data)->num_vlan = htons(num_vlan);
708 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
709 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
710 tt_vlan->vid = htons(vlan->vid);
711 tt_vlan->crc = htonl(vlan->tt.crc);
716 tt_change_ptr = (uint8_t *)*tt_data + change_offset;
717 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
725 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
727 * @bat_priv: the bat priv with all the soft interface information
728 * @tt_data: uninitialised pointer to the address of the TVLV buffer
729 * @tt_change: uninitialised pointer to the address of the area where the TT
730 * changes can be stored
731 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
732 * function reserves the amount of space needed to send the entire local TT
733 * table. In case of success the value is updated with the real amount of
736 * Allocate the needed amount of memory for the entire TT TVLV and write its
737 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
738 * objects, one per active VLAN.
740 * Return the size of the allocated buffer or 0 in case of failure.
743 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
744 struct batadv_tvlv_tt_data **tt_data,
745 struct batadv_tvlv_tt_change **tt_change,
748 struct batadv_tvlv_tt_vlan_data *tt_vlan;
749 struct batadv_softif_vlan *vlan;
750 uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
751 uint8_t *tt_change_ptr;
755 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
757 num_entries += atomic_read(&vlan->tt.num_entries);
760 change_offset = sizeof(**tt_data);
761 change_offset += num_vlan * sizeof(*tt_vlan);
763 /* if tt_len is negative, allocate the space needed by the full table */
765 *tt_len = batadv_tt_len(num_entries);
768 tvlv_len += change_offset;
770 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
776 (*tt_data)->flags = BATADV_NO_FLAGS;
777 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
778 (*tt_data)->num_vlan = htons(num_vlan);
780 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
781 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
782 tt_vlan->vid = htons(vlan->vid);
783 tt_vlan->crc = htonl(vlan->tt.crc);
788 tt_change_ptr = (uint8_t *)*tt_data + change_offset;
789 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
797 * batadv_tt_tvlv_container_update - update the translation table tvlv container
798 * after local tt changes have been committed
799 * @bat_priv: the bat priv with all the soft interface information
801 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
803 struct batadv_tt_change_node *entry, *safe;
804 struct batadv_tvlv_tt_data *tt_data;
805 struct batadv_tvlv_tt_change *tt_change;
806 int tt_diff_len, tt_change_len = 0;
807 int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
810 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
811 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
813 /* if we have too many changes for one packet don't send any
814 * and wait for the tt table request which will be fragmented
816 if (tt_diff_len > bat_priv->soft_iface->mtu)
819 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
820 &tt_change, &tt_diff_len);
824 tt_data->flags = BATADV_TT_OGM_DIFF;
826 if (tt_diff_len == 0)
827 goto container_register;
829 spin_lock_bh(&bat_priv->tt.changes_list_lock);
830 atomic_set(&bat_priv->tt.local_changes, 0);
832 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
834 if (tt_diff_entries_count < tt_diff_entries_num) {
835 memcpy(tt_change + tt_diff_entries_count,
837 sizeof(struct batadv_tvlv_tt_change));
838 tt_diff_entries_count++;
840 list_del(&entry->list);
843 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
845 /* Keep the buffer for possible tt_request */
846 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
847 kfree(bat_priv->tt.last_changeset);
848 bat_priv->tt.last_changeset_len = 0;
849 bat_priv->tt.last_changeset = NULL;
850 tt_change_len = batadv_tt_len(tt_diff_entries_count);
851 /* check whether this new OGM has no changes due to size problems */
852 if (tt_diff_entries_count > 0) {
853 /* if kmalloc() fails we will reply with the full table
854 * instead of providing the diff
856 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
857 if (bat_priv->tt.last_changeset) {
858 memcpy(bat_priv->tt.last_changeset,
859 tt_change, tt_change_len);
860 bat_priv->tt.last_changeset_len = tt_diff_len;
863 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
866 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
871 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
873 struct net_device *net_dev = (struct net_device *)seq->private;
874 struct batadv_priv *bat_priv = netdev_priv(net_dev);
875 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
876 struct batadv_tt_common_entry *tt_common_entry;
877 struct batadv_tt_local_entry *tt_local;
878 struct batadv_hard_iface *primary_if;
879 struct batadv_softif_vlan *vlan;
880 struct hlist_head *head;
885 unsigned long last_seen_jiffies;
887 uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
889 primary_if = batadv_seq_print_text_primary_if_get(seq);
894 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
895 net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
896 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
897 "Flags", "Last seen", "CRC");
899 for (i = 0; i < hash->size; i++) {
900 head = &hash->table[i];
903 hlist_for_each_entry_rcu(tt_common_entry,
905 tt_local = container_of(tt_common_entry,
906 struct batadv_tt_local_entry,
908 vid = tt_common_entry->vid;
909 last_seen_jiffies = jiffies - tt_local->last_seen;
910 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
911 last_seen_secs = last_seen_msecs / 1000;
912 last_seen_msecs = last_seen_msecs % 1000;
914 no_purge = tt_common_entry->flags & np_flag;
916 vlan = batadv_softif_vlan_get(bat_priv, vid);
918 seq_printf(seq, "Cannot retrieve VLAN %d\n",
919 BATADV_PRINT_VID(vid));
924 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
925 tt_common_entry->addr,
926 BATADV_PRINT_VID(tt_common_entry->vid),
927 (tt_common_entry->flags &
928 BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
929 no_purge ? 'P' : '.',
930 (tt_common_entry->flags &
931 BATADV_TT_CLIENT_NEW ? 'N' : '.'),
932 (tt_common_entry->flags &
933 BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
934 (tt_common_entry->flags &
935 BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
936 (tt_common_entry->flags &
937 BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
938 no_purge ? 0 : last_seen_secs,
939 no_purge ? 0 : last_seen_msecs,
942 batadv_softif_vlan_free_ref(vlan);
948 batadv_hardif_free_ref(primary_if);
953 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
954 struct batadv_tt_local_entry *tt_local_entry,
955 uint16_t flags, const char *message)
957 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
959 /* The local client has to be marked as "pending to be removed" but has
960 * to be kept in the table in order to send it in a full table
961 * response issued before the net ttvn increment (consistency check)
963 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
965 batadv_dbg(BATADV_DBG_TT, bat_priv,
966 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
967 tt_local_entry->common.addr,
968 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
972 * batadv_tt_local_remove - logically remove an entry from the local table
973 * @bat_priv: the bat priv with all the soft interface information
974 * @addr: the MAC address of the client to remove
975 * @vid: VLAN identifier
976 * @message: message to append to the log on deletion
977 * @roaming: true if the deletion is due to a roaming event
979 * Returns the flags assigned to the local entry before being deleted
981 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
982 const uint8_t *addr, unsigned short vid,
983 const char *message, bool roaming)
985 struct batadv_tt_local_entry *tt_local_entry;
986 uint16_t flags, curr_flags = BATADV_NO_FLAGS;
988 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
992 curr_flags = tt_local_entry->common.flags;
994 flags = BATADV_TT_CLIENT_DEL;
995 /* if this global entry addition is due to a roaming, the node has to
996 * mark the local entry as "roamed" in order to correctly reroute
1000 flags |= BATADV_TT_CLIENT_ROAM;
1001 /* mark the local client as ROAMed */
1002 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1005 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1006 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1010 /* if this client has been added right now, it is possible to
1011 * immediately purge it
1013 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1014 hlist_del_rcu(&tt_local_entry->common.hash_entry);
1015 batadv_tt_local_entry_free_ref(tt_local_entry);
1019 batadv_tt_local_entry_free_ref(tt_local_entry);
1025 * batadv_tt_local_purge_list - purge inactive tt local entries
1026 * @bat_priv: the bat priv with all the soft interface information
1027 * @head: pointer to the list containing the local tt entries
1028 * @timeout: parameter deciding whether a given tt local entry is considered
1031 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1032 struct hlist_head *head,
1035 struct batadv_tt_local_entry *tt_local_entry;
1036 struct batadv_tt_common_entry *tt_common_entry;
1037 struct hlist_node *node_tmp;
1039 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1041 tt_local_entry = container_of(tt_common_entry,
1042 struct batadv_tt_local_entry,
1044 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1047 /* entry already marked for deletion */
1048 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1051 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1054 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1055 BATADV_TT_CLIENT_DEL, "timed out");
1060 * batadv_tt_local_purge - purge inactive tt local entries
1061 * @bat_priv: the bat priv with all the soft interface information
1062 * @timeout: parameter deciding whether a given tt local entry is considered
1065 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1068 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1069 struct hlist_head *head;
1070 spinlock_t *list_lock; /* protects write access to the hash lists */
1073 for (i = 0; i < hash->size; i++) {
1074 head = &hash->table[i];
1075 list_lock = &hash->list_locks[i];
1077 spin_lock_bh(list_lock);
1078 batadv_tt_local_purge_list(bat_priv, head, timeout);
1079 spin_unlock_bh(list_lock);
1083 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1085 struct batadv_hashtable *hash;
1086 spinlock_t *list_lock; /* protects write access to the hash lists */
1087 struct batadv_tt_common_entry *tt_common_entry;
1088 struct batadv_tt_local_entry *tt_local;
1089 struct hlist_node *node_tmp;
1090 struct hlist_head *head;
1093 if (!bat_priv->tt.local_hash)
1096 hash = bat_priv->tt.local_hash;
1098 for (i = 0; i < hash->size; i++) {
1099 head = &hash->table[i];
1100 list_lock = &hash->list_locks[i];
1102 spin_lock_bh(list_lock);
1103 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1105 hlist_del_rcu(&tt_common_entry->hash_entry);
1106 tt_local = container_of(tt_common_entry,
1107 struct batadv_tt_local_entry,
1109 batadv_tt_local_entry_free_ref(tt_local);
1111 spin_unlock_bh(list_lock);
1114 batadv_hash_destroy(hash);
1116 bat_priv->tt.local_hash = NULL;
1119 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1121 if (bat_priv->tt.global_hash)
1124 bat_priv->tt.global_hash = batadv_hash_new(1024);
1126 if (!bat_priv->tt.global_hash)
1129 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1130 &batadv_tt_global_hash_lock_class_key);
1135 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1137 struct batadv_tt_change_node *entry, *safe;
1139 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1141 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1143 list_del(&entry->list);
1147 atomic_set(&bat_priv->tt.local_changes, 0);
1148 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1151 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1152 * batadv_tt_global_entry list
1154 * returns it with an increased refcounter, NULL if not found
1156 static struct batadv_tt_orig_list_entry *
1157 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1158 const struct batadv_orig_node *orig_node)
1160 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1161 const struct hlist_head *head;
1164 head = &entry->orig_list;
1165 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1166 if (tmp_orig_entry->orig_node != orig_node)
1168 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1171 orig_entry = tmp_orig_entry;
1179 /* find out if an orig_node is already in the list of a tt_global_entry.
1180 * returns true if found, false otherwise
1183 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1184 const struct batadv_orig_node *orig_node)
1186 struct batadv_tt_orig_list_entry *orig_entry;
1189 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1192 batadv_tt_orig_list_entry_free_ref(orig_entry);
1199 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1200 struct batadv_orig_node *orig_node, int ttvn)
1202 struct batadv_tt_orig_list_entry *orig_entry;
1204 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1206 /* refresh the ttvn: the current value could be a bogus one that
1207 * was added during a "temporary client detection"
1209 orig_entry->ttvn = ttvn;
1213 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1217 INIT_HLIST_NODE(&orig_entry->list);
1218 atomic_inc(&orig_node->refcount);
1219 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1220 orig_entry->orig_node = orig_node;
1221 orig_entry->ttvn = ttvn;
1222 atomic_set(&orig_entry->refcount, 2);
1224 spin_lock_bh(&tt_global->list_lock);
1225 hlist_add_head_rcu(&orig_entry->list,
1226 &tt_global->orig_list);
1227 spin_unlock_bh(&tt_global->list_lock);
1230 batadv_tt_orig_list_entry_free_ref(orig_entry);
1234 * batadv_tt_global_add - add a new TT global entry or update an existing one
1235 * @bat_priv: the bat priv with all the soft interface information
1236 * @orig_node: the originator announcing the client
1237 * @tt_addr: the mac address of the non-mesh client
1238 * @vid: VLAN identifier
1239 * @flags: TT flags that have to be set for this non-mesh client
1240 * @ttvn: the tt version number ever announcing this non-mesh client
1242 * Add a new TT global entry for the given originator. If the entry already
1243 * exists add a new reference to the given originator (a global entry can have
1244 * references to multiple originators) and adjust the flags attribute to reflect
1245 * the function argument.
1246 * If a TT local entry exists for this non-mesh client remove it.
1248 * The caller must hold orig_node refcount.
1250 * Return true if the new entry has been added, false otherwise
1252 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1253 struct batadv_orig_node *orig_node,
1254 const unsigned char *tt_addr,
1255 unsigned short vid, uint16_t flags,
1258 struct batadv_tt_global_entry *tt_global_entry;
1259 struct batadv_tt_local_entry *tt_local_entry;
1262 struct batadv_tt_common_entry *common;
1263 uint16_t local_flags;
1265 /* ignore global entries from backbone nodes */
1266 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1269 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1270 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1272 /* if the node already has a local client for this entry, it has to wait
1273 * for a roaming advertisement instead of manually messing up the global
1276 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1277 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1280 if (!tt_global_entry) {
1281 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1282 if (!tt_global_entry)
1285 common = &tt_global_entry->common;
1286 ether_addr_copy(common->addr, tt_addr);
1289 common->flags = flags;
1290 tt_global_entry->roam_at = 0;
1291 /* node must store current time in case of roaming. This is
1292 * needed to purge this entry out on timeout (if nobody claims
1295 if (flags & BATADV_TT_CLIENT_ROAM)
1296 tt_global_entry->roam_at = jiffies;
1297 atomic_set(&common->refcount, 2);
1298 common->added_at = jiffies;
1300 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1301 spin_lock_init(&tt_global_entry->list_lock);
1303 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1305 batadv_choose_tt, common,
1306 &common->hash_entry);
1308 if (unlikely(hash_added != 0)) {
1309 /* remove the reference for the hash */
1310 batadv_tt_global_entry_free_ref(tt_global_entry);
1314 common = &tt_global_entry->common;
1315 /* If there is already a global entry, we can use this one for
1317 * But if we are trying to add a temporary client then here are
1318 * two options at this point:
1319 * 1) the global client is not a temporary client: the global
1320 * client has to be left as it is, temporary information
1321 * should never override any already known client state
1322 * 2) the global client is a temporary client: purge the
1323 * originator list and add the new one orig_entry
1325 if (flags & BATADV_TT_CLIENT_TEMP) {
1326 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1328 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1331 batadv_tt_global_del_orig_list(tt_global_entry);
1332 goto add_orig_entry;
1335 /* if the client was temporary added before receiving the first
1336 * OGM announcing it, we have to clear the TEMP flag
1338 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1340 /* the change can carry possible "attribute" flags like the
1341 * TT_CLIENT_WIFI, therefore they have to be copied in the
1344 tt_global_entry->common.flags |= flags;
1346 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1347 * one originator left in the list and we previously received a
1348 * delete + roaming change for this originator.
1350 * We should first delete the old originator before adding the
1353 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1354 batadv_tt_global_del_orig_list(tt_global_entry);
1355 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1356 tt_global_entry->roam_at = 0;
1360 /* add the new orig_entry (if needed) or update it */
1361 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1363 batadv_dbg(BATADV_DBG_TT, bat_priv,
1364 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1365 common->addr, BATADV_PRINT_VID(common->vid),
1370 /* Do not remove multicast addresses from the local hash on
1373 if (is_multicast_ether_addr(tt_addr))
1376 /* remove address from local hash if present */
1377 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1378 "global tt received",
1379 flags & BATADV_TT_CLIENT_ROAM);
1380 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1382 if (!(flags & BATADV_TT_CLIENT_ROAM))
1383 /* this is a normal global add. Therefore the client is not in a
1384 * roaming state anymore.
1386 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1389 if (tt_global_entry)
1390 batadv_tt_global_entry_free_ref(tt_global_entry);
1392 batadv_tt_local_entry_free_ref(tt_local_entry);
1397 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1398 * @bat_priv: the bat priv with all the soft interface information
1399 * @tt_global_entry: global translation table entry to be analyzed
1401 * This functon assumes the caller holds rcu_read_lock().
1402 * Returns best originator list entry or NULL on errors.
1404 static struct batadv_tt_orig_list_entry *
1405 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1406 struct batadv_tt_global_entry *tt_global_entry)
1408 struct batadv_neigh_node *router, *best_router = NULL;
1409 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1410 struct hlist_head *head;
1411 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1413 head = &tt_global_entry->orig_list;
1414 hlist_for_each_entry_rcu(orig_entry, head, list) {
1415 router = batadv_orig_router_get(orig_entry->orig_node,
1421 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1422 best_router, BATADV_IF_DEFAULT) <= 0) {
1423 batadv_neigh_node_free_ref(router);
1427 /* release the refcount for the "old" best */
1429 batadv_neigh_node_free_ref(best_router);
1431 best_entry = orig_entry;
1432 best_router = router;
1436 batadv_neigh_node_free_ref(best_router);
1442 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1443 * for this global entry
1444 * @bat_priv: the bat priv with all the soft interface information
1445 * @tt_global_entry: global translation table entry to be printed
1446 * @seq: debugfs table seq_file struct
1448 * This functon assumes the caller holds rcu_read_lock().
1451 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1452 struct batadv_tt_global_entry *tt_global_entry,
1453 struct seq_file *seq)
1455 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1456 struct batadv_tt_common_entry *tt_common_entry;
1457 struct batadv_orig_node_vlan *vlan;
1458 struct hlist_head *head;
1462 tt_common_entry = &tt_global_entry->common;
1463 flags = tt_common_entry->flags;
1465 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1467 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1468 tt_common_entry->vid);
1471 " * Cannot retrieve VLAN %d for originator %pM\n",
1472 BATADV_PRINT_VID(tt_common_entry->vid),
1473 best_entry->orig_node->orig);
1477 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1479 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1480 '*', tt_global_entry->common.addr,
1481 BATADV_PRINT_VID(tt_global_entry->common.vid),
1482 best_entry->ttvn, best_entry->orig_node->orig,
1483 last_ttvn, vlan->tt.crc,
1484 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1485 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1486 (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1487 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1489 batadv_orig_node_vlan_free_ref(vlan);
1493 head = &tt_global_entry->orig_list;
1495 hlist_for_each_entry_rcu(orig_entry, head, list) {
1496 if (best_entry == orig_entry)
1499 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1500 tt_common_entry->vid);
1503 " + Cannot retrieve VLAN %d for originator %pM\n",
1504 BATADV_PRINT_VID(tt_common_entry->vid),
1505 orig_entry->orig_node->orig);
1509 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1511 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1512 '+', tt_global_entry->common.addr,
1513 BATADV_PRINT_VID(tt_global_entry->common.vid),
1514 orig_entry->ttvn, orig_entry->orig_node->orig,
1515 last_ttvn, vlan->tt.crc,
1516 (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1517 (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1518 (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1519 (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1521 batadv_orig_node_vlan_free_ref(vlan);
1525 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1527 struct net_device *net_dev = (struct net_device *)seq->private;
1528 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1529 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1530 struct batadv_tt_common_entry *tt_common_entry;
1531 struct batadv_tt_global_entry *tt_global;
1532 struct batadv_hard_iface *primary_if;
1533 struct hlist_head *head;
1536 primary_if = batadv_seq_print_text_primary_if_get(seq);
1541 "Globally announced TT entries received via the mesh %s\n",
1543 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1544 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1547 for (i = 0; i < hash->size; i++) {
1548 head = &hash->table[i];
1551 hlist_for_each_entry_rcu(tt_common_entry,
1553 tt_global = container_of(tt_common_entry,
1554 struct batadv_tt_global_entry,
1556 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1562 batadv_hardif_free_ref(primary_if);
1566 /* deletes the orig list of a tt_global_entry */
1568 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1570 struct hlist_head *head;
1571 struct hlist_node *safe;
1572 struct batadv_tt_orig_list_entry *orig_entry;
1574 spin_lock_bh(&tt_global_entry->list_lock);
1575 head = &tt_global_entry->orig_list;
1576 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1577 hlist_del_rcu(&orig_entry->list);
1578 batadv_tt_global_size_dec(orig_entry->orig_node,
1579 tt_global_entry->common.vid);
1580 batadv_tt_orig_list_entry_free_ref(orig_entry);
1582 spin_unlock_bh(&tt_global_entry->list_lock);
1586 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1587 struct batadv_tt_global_entry *tt_global_entry,
1588 struct batadv_orig_node *orig_node,
1589 const char *message)
1591 struct hlist_head *head;
1592 struct hlist_node *safe;
1593 struct batadv_tt_orig_list_entry *orig_entry;
1596 spin_lock_bh(&tt_global_entry->list_lock);
1597 head = &tt_global_entry->orig_list;
1598 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1599 if (orig_entry->orig_node == orig_node) {
1600 vid = tt_global_entry->common.vid;
1601 batadv_dbg(BATADV_DBG_TT, bat_priv,
1602 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1604 tt_global_entry->common.addr,
1605 BATADV_PRINT_VID(vid), message);
1606 hlist_del_rcu(&orig_entry->list);
1607 batadv_tt_global_size_dec(orig_node,
1608 tt_global_entry->common.vid);
1609 batadv_tt_orig_list_entry_free_ref(orig_entry);
1612 spin_unlock_bh(&tt_global_entry->list_lock);
1615 /* If the client is to be deleted, we check if it is the last origantor entry
1616 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1617 * timer, otherwise we simply remove the originator scheduled for deletion.
1620 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1621 struct batadv_tt_global_entry *tt_global_entry,
1622 struct batadv_orig_node *orig_node,
1623 const char *message)
1625 bool last_entry = true;
1626 struct hlist_head *head;
1627 struct batadv_tt_orig_list_entry *orig_entry;
1629 /* no local entry exists, case 1:
1630 * Check if this is the last one or if other entries exist.
1634 head = &tt_global_entry->orig_list;
1635 hlist_for_each_entry_rcu(orig_entry, head, list) {
1636 if (orig_entry->orig_node != orig_node) {
1644 /* its the last one, mark for roaming. */
1645 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1646 tt_global_entry->roam_at = jiffies;
1648 /* there is another entry, we can simply delete this
1649 * one and can still use the other one.
1651 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1652 orig_node, message);
1656 * batadv_tt_global_del - remove a client from the global table
1657 * @bat_priv: the bat priv with all the soft interface information
1658 * @orig_node: an originator serving this client
1659 * @addr: the mac address of the client
1660 * @vid: VLAN identifier
1661 * @message: a message explaining the reason for deleting the client to print
1662 * for debugging purpose
1663 * @roaming: true if the deletion has been triggered by a roaming event
1665 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1666 struct batadv_orig_node *orig_node,
1667 const unsigned char *addr, unsigned short vid,
1668 const char *message, bool roaming)
1670 struct batadv_tt_global_entry *tt_global_entry;
1671 struct batadv_tt_local_entry *local_entry = NULL;
1673 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1674 if (!tt_global_entry)
1678 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1679 orig_node, message);
1681 if (hlist_empty(&tt_global_entry->orig_list))
1682 batadv_tt_global_free(bat_priv, tt_global_entry,
1688 /* if we are deleting a global entry due to a roam
1689 * event, there are two possibilities:
1690 * 1) the client roamed from node A to node B => if there
1691 * is only one originator left for this client, we mark
1692 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1693 * wait for node B to claim it. In case of timeout
1694 * the entry is purged.
1696 * If there are other originators left, we directly delete
1698 * 2) the client roamed to us => we can directly delete
1699 * the global entry, since it is useless now.
1701 local_entry = batadv_tt_local_hash_find(bat_priv,
1702 tt_global_entry->common.addr,
1705 /* local entry exists, case 2: client roamed to us. */
1706 batadv_tt_global_del_orig_list(tt_global_entry);
1707 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1709 /* no local entry exists, case 1: check for roaming */
1710 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1711 orig_node, message);
1715 if (tt_global_entry)
1716 batadv_tt_global_entry_free_ref(tt_global_entry);
1718 batadv_tt_local_entry_free_ref(local_entry);
1722 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1723 * given originator matching the provided vid
1724 * @bat_priv: the bat priv with all the soft interface information
1725 * @orig_node: the originator owning the entries to remove
1726 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1728 * @message: debug message to print as "reason"
1730 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1731 struct batadv_orig_node *orig_node,
1733 const char *message)
1735 struct batadv_tt_global_entry *tt_global;
1736 struct batadv_tt_common_entry *tt_common_entry;
1738 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1739 struct hlist_node *safe;
1740 struct hlist_head *head;
1741 spinlock_t *list_lock; /* protects write access to the hash lists */
1747 for (i = 0; i < hash->size; i++) {
1748 head = &hash->table[i];
1749 list_lock = &hash->list_locks[i];
1751 spin_lock_bh(list_lock);
1752 hlist_for_each_entry_safe(tt_common_entry, safe,
1754 /* remove only matching entries */
1755 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1758 tt_global = container_of(tt_common_entry,
1759 struct batadv_tt_global_entry,
1762 batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1763 orig_node, message);
1765 if (hlist_empty(&tt_global->orig_list)) {
1766 vid = tt_global->common.vid;
1767 batadv_dbg(BATADV_DBG_TT, bat_priv,
1768 "Deleting global tt entry %pM (vid: %d): %s\n",
1769 tt_global->common.addr,
1770 BATADV_PRINT_VID(vid), message);
1771 hlist_del_rcu(&tt_common_entry->hash_entry);
1772 batadv_tt_global_entry_free_ref(tt_global);
1775 spin_unlock_bh(list_lock);
1777 orig_node->tt_initialised = false;
1780 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1784 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1785 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1787 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1788 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1790 *msg = "Roaming timeout\n";
1793 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1794 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1796 *msg = "Temporary client timeout\n";
1802 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1804 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1805 struct hlist_head *head;
1806 struct hlist_node *node_tmp;
1807 spinlock_t *list_lock; /* protects write access to the hash lists */
1810 struct batadv_tt_common_entry *tt_common;
1811 struct batadv_tt_global_entry *tt_global;
1813 for (i = 0; i < hash->size; i++) {
1814 head = &hash->table[i];
1815 list_lock = &hash->list_locks[i];
1817 spin_lock_bh(list_lock);
1818 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1820 tt_global = container_of(tt_common,
1821 struct batadv_tt_global_entry,
1824 if (!batadv_tt_global_to_purge(tt_global, &msg))
1827 batadv_dbg(BATADV_DBG_TT, bat_priv,
1828 "Deleting global tt entry %pM (vid: %d): %s\n",
1829 tt_global->common.addr,
1830 BATADV_PRINT_VID(tt_global->common.vid),
1833 hlist_del_rcu(&tt_common->hash_entry);
1835 batadv_tt_global_entry_free_ref(tt_global);
1837 spin_unlock_bh(list_lock);
1841 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1843 struct batadv_hashtable *hash;
1844 spinlock_t *list_lock; /* protects write access to the hash lists */
1845 struct batadv_tt_common_entry *tt_common_entry;
1846 struct batadv_tt_global_entry *tt_global;
1847 struct hlist_node *node_tmp;
1848 struct hlist_head *head;
1851 if (!bat_priv->tt.global_hash)
1854 hash = bat_priv->tt.global_hash;
1856 for (i = 0; i < hash->size; i++) {
1857 head = &hash->table[i];
1858 list_lock = &hash->list_locks[i];
1860 spin_lock_bh(list_lock);
1861 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1863 hlist_del_rcu(&tt_common_entry->hash_entry);
1864 tt_global = container_of(tt_common_entry,
1865 struct batadv_tt_global_entry,
1867 batadv_tt_global_entry_free_ref(tt_global);
1869 spin_unlock_bh(list_lock);
1872 batadv_hash_destroy(hash);
1874 bat_priv->tt.global_hash = NULL;
1878 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1879 struct batadv_tt_global_entry *tt_global_entry)
1883 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1884 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1887 /* check if the two clients are marked as isolated */
1888 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1889 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1896 * batadv_transtable_search - get the mesh destination for a given client
1897 * @bat_priv: the bat priv with all the soft interface information
1898 * @src: mac address of the source client
1899 * @addr: mac address of the destination client
1900 * @vid: VLAN identifier
1902 * Returns a pointer to the originator that was selected as destination in the
1903 * mesh for contacting the client 'addr', NULL otherwise.
1904 * In case of multiple originators serving the same client, the function returns
1905 * the best one (best in terms of metric towards the destination node).
1907 * If the two clients are AP isolated the function returns NULL.
1909 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1911 const uint8_t *addr,
1914 struct batadv_tt_local_entry *tt_local_entry = NULL;
1915 struct batadv_tt_global_entry *tt_global_entry = NULL;
1916 struct batadv_orig_node *orig_node = NULL;
1917 struct batadv_tt_orig_list_entry *best_entry;
1919 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
1920 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1921 if (!tt_local_entry ||
1922 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1926 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1927 if (!tt_global_entry)
1930 /* check whether the clients should not communicate due to AP
1933 if (tt_local_entry &&
1934 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1938 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1939 /* found anything? */
1941 orig_node = best_entry->orig_node;
1942 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1947 if (tt_global_entry)
1948 batadv_tt_global_entry_free_ref(tt_global_entry);
1950 batadv_tt_local_entry_free_ref(tt_local_entry);
1956 * batadv_tt_global_crc - calculates the checksum of the local table belonging
1957 * to the given orig_node
1958 * @bat_priv: the bat priv with all the soft interface information
1959 * @orig_node: originator for which the CRC should be computed
1960 * @vid: VLAN identifier for which the CRC32 has to be computed
1962 * This function computes the checksum for the global table corresponding to a
1963 * specific originator. In particular, the checksum is computed as follows: For
1964 * each client connected to the originator the CRC32C of the MAC address and the
1965 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1968 * The idea behind is that CRC32C should be used as much as possible in order to
1969 * produce a unique hash of the table, but since the order which is used to feed
1970 * the CRC32C function affects the result and since every node in the network
1971 * probably sorts the clients differently, the hash function cannot be directly
1972 * computed over the entire table. Hence the CRC32C is used only on
1973 * the single client entry, while all the results are then xor'ed together
1974 * because the XOR operation can combine them all while trying to reduce the
1975 * noise as much as possible.
1977 * Returns the checksum of the global table of a given originator.
1979 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1980 struct batadv_orig_node *orig_node,
1983 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1984 struct batadv_tt_common_entry *tt_common;
1985 struct batadv_tt_global_entry *tt_global;
1986 struct hlist_head *head;
1987 uint32_t i, crc_tmp, crc = 0;
1991 for (i = 0; i < hash->size; i++) {
1992 head = &hash->table[i];
1995 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1996 tt_global = container_of(tt_common,
1997 struct batadv_tt_global_entry,
1999 /* compute the CRC only for entries belonging to the
2000 * VLAN identified by the vid passed as parameter
2002 if (tt_common->vid != vid)
2005 /* Roaming clients are in the global table for
2006 * consistency only. They don't have to be
2007 * taken into account while computing the
2010 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2012 /* Temporary clients have not been announced yet, so
2013 * they have to be skipped while computing the global
2016 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2019 /* find out if this global entry is announced by this
2022 if (!batadv_tt_global_entry_has_orig(tt_global,
2026 /* use network order to read the VID: this ensures that
2027 * every node reads the bytes in the same order.
2029 tmp_vid = htons(tt_common->vid);
2030 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2032 /* compute the CRC on flags that have to be kept in sync
2035 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2036 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2038 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2047 * batadv_tt_local_crc - calculates the checksum of the local table
2048 * @bat_priv: the bat priv with all the soft interface information
2049 * @vid: VLAN identifier for which the CRC32 has to be computed
2051 * For details about the computation, please refer to the documentation for
2052 * batadv_tt_global_crc().
2054 * Returns the checksum of the local table
2056 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2059 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2060 struct batadv_tt_common_entry *tt_common;
2061 struct hlist_head *head;
2062 uint32_t i, crc_tmp, crc = 0;
2066 for (i = 0; i < hash->size; i++) {
2067 head = &hash->table[i];
2070 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2071 /* compute the CRC only for entries belonging to the
2072 * VLAN identified by vid
2074 if (tt_common->vid != vid)
2077 /* not yet committed clients have not to be taken into
2078 * account while computing the CRC
2080 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2083 /* use network order to read the VID: this ensures that
2084 * every node reads the bytes in the same order.
2086 tmp_vid = htons(tt_common->vid);
2087 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2089 /* compute the CRC on flags that have to be kept in sync
2092 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2093 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2095 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2103 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2105 struct batadv_tt_req_node *node, *safe;
2107 spin_lock_bh(&bat_priv->tt.req_list_lock);
2109 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2110 list_del(&node->list);
2114 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2117 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2118 struct batadv_orig_node *orig_node,
2119 const void *tt_buff,
2120 uint16_t tt_buff_len)
2122 /* Replace the old buffer only if I received something in the
2123 * last OGM (the OGM could carry no changes)
2125 spin_lock_bh(&orig_node->tt_buff_lock);
2126 if (tt_buff_len > 0) {
2127 kfree(orig_node->tt_buff);
2128 orig_node->tt_buff_len = 0;
2129 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2130 if (orig_node->tt_buff) {
2131 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2132 orig_node->tt_buff_len = tt_buff_len;
2135 spin_unlock_bh(&orig_node->tt_buff_lock);
2138 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2140 struct batadv_tt_req_node *node, *safe;
2142 spin_lock_bh(&bat_priv->tt.req_list_lock);
2143 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2144 if (batadv_has_timed_out(node->issued_at,
2145 BATADV_TT_REQUEST_TIMEOUT)) {
2146 list_del(&node->list);
2150 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2153 /* returns the pointer to the new tt_req_node struct if no request
2154 * has already been issued for this orig_node, NULL otherwise
2156 static struct batadv_tt_req_node *
2157 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2158 struct batadv_orig_node *orig_node)
2160 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2162 spin_lock_bh(&bat_priv->tt.req_list_lock);
2163 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2164 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2165 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2166 BATADV_TT_REQUEST_TIMEOUT))
2170 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2174 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2175 tt_req_node->issued_at = jiffies;
2177 list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2179 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2184 * batadv_tt_local_valid - verify that given tt entry is a valid one
2185 * @entry_ptr: to be checked local tt entry
2186 * @data_ptr: not used but definition required to satisfy the callback prototype
2188 * Returns 1 if the entry is a valid, 0 otherwise.
2190 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2192 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2194 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2199 static int batadv_tt_global_valid(const void *entry_ptr,
2200 const void *data_ptr)
2202 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2203 const struct batadv_tt_global_entry *tt_global_entry;
2204 const struct batadv_orig_node *orig_node = data_ptr;
2206 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2207 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2210 tt_global_entry = container_of(tt_common_entry,
2211 struct batadv_tt_global_entry,
2214 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2218 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2220 * @bat_priv: the bat priv with all the soft interface information
2221 * @hash: hash table containing the tt entries
2222 * @tt_len: expected tvlv tt data buffer length in number of bytes
2223 * @tvlv_buff: pointer to the buffer to fill with the TT data
2224 * @valid_cb: function to filter tt change entries
2225 * @cb_data: data passed to the filter function as argument
2227 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2228 struct batadv_hashtable *hash,
2229 void *tvlv_buff, uint16_t tt_len,
2230 int (*valid_cb)(const void *, const void *),
2233 struct batadv_tt_common_entry *tt_common_entry;
2234 struct batadv_tvlv_tt_change *tt_change;
2235 struct hlist_head *head;
2236 uint16_t tt_tot, tt_num_entries = 0;
2239 tt_tot = batadv_tt_entries(tt_len);
2240 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2243 for (i = 0; i < hash->size; i++) {
2244 head = &hash->table[i];
2246 hlist_for_each_entry_rcu(tt_common_entry,
2248 if (tt_tot == tt_num_entries)
2251 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2254 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2255 tt_change->flags = tt_common_entry->flags;
2256 tt_change->vid = htons(tt_common_entry->vid);
2257 memset(tt_change->reserved, 0,
2258 sizeof(tt_change->reserved));
2268 * batadv_tt_global_check_crc - check if all the CRCs are correct
2269 * @orig_node: originator for which the CRCs have to be checked
2270 * @tt_vlan: pointer to the first tvlv VLAN entry
2271 * @num_vlan: number of tvlv VLAN entries
2272 * @create: if true, create VLAN objects if not found
2274 * Return true if all the received CRCs match the locally stored ones, false
2277 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2278 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2281 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2282 struct batadv_orig_node_vlan *vlan;
2286 /* check if each received CRC matches the locally stored one */
2287 for (i = 0; i < num_vlan; i++) {
2288 tt_vlan_tmp = tt_vlan + i;
2290 /* if orig_node is a backbone node for this VLAN, don't check
2291 * the CRC as we ignore all the global entries over it
2293 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2295 ntohs(tt_vlan_tmp->vid)))
2298 vlan = batadv_orig_node_vlan_get(orig_node,
2299 ntohs(tt_vlan_tmp->vid));
2304 batadv_orig_node_vlan_free_ref(vlan);
2306 if (crc != ntohl(tt_vlan_tmp->crc))
2314 * batadv_tt_local_update_crc - update all the local CRCs
2315 * @bat_priv: the bat priv with all the soft interface information
2317 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2319 struct batadv_softif_vlan *vlan;
2321 /* recompute the global CRC for each VLAN */
2323 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2324 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2330 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2331 * @bat_priv: the bat priv with all the soft interface information
2332 * @orig_node: the orig_node for which the CRCs have to be updated
2334 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2335 struct batadv_orig_node *orig_node)
2337 struct batadv_orig_node_vlan *vlan;
2340 /* recompute the global CRC for each VLAN */
2342 list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2343 /* if orig_node is a backbone node for this VLAN, don't compute
2344 * the CRC as we ignore all the global entries over it
2346 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2350 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2357 * batadv_send_tt_request - send a TT Request message to a given node
2358 * @bat_priv: the bat priv with all the soft interface information
2359 * @dst_orig_node: the destination of the message
2360 * @ttvn: the version number that the source of the message is looking for
2361 * @tt_vlan: pointer to the first tvlv VLAN object to request
2362 * @num_vlan: number of tvlv VLAN entries
2363 * @full_table: ask for the entire translation table if true, while only for the
2364 * last TT diff otherwise
2366 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2367 struct batadv_orig_node *dst_orig_node,
2369 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2370 uint16_t num_vlan, bool full_table)
2372 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2373 struct batadv_tt_req_node *tt_req_node = NULL;
2374 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2375 struct batadv_hard_iface *primary_if;
2379 primary_if = batadv_primary_if_get_selected(bat_priv);
2383 /* The new tt_req will be issued only if I'm not waiting for a
2384 * reply from the same orig_node yet
2386 tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2390 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2391 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2395 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2396 tvlv_tt_data->ttvn = ttvn;
2397 tvlv_tt_data->num_vlan = htons(num_vlan);
2399 /* send all the CRCs within the request. This is needed by intermediate
2400 * nodes to ensure they have the correct table before replying
2402 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2403 for (i = 0; i < num_vlan; i++) {
2404 tt_vlan_req->vid = tt_vlan->vid;
2405 tt_vlan_req->crc = tt_vlan->crc;
2412 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2414 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2415 dst_orig_node->orig, full_table ? 'F' : '.');
2417 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2418 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2419 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2420 tvlv_tt_data, size);
2425 batadv_hardif_free_ref(primary_if);
2426 if (ret && tt_req_node) {
2427 spin_lock_bh(&bat_priv->tt.req_list_lock);
2428 list_del(&tt_req_node->list);
2429 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2432 kfree(tvlv_tt_data);
2437 * batadv_send_other_tt_response - send reply to tt request concerning another
2438 * node's translation table
2439 * @bat_priv: the bat priv with all the soft interface information
2440 * @tt_data: tt data containing the tt request information
2441 * @req_src: mac address of tt request sender
2442 * @req_dst: mac address of tt request recipient
2444 * Returns true if tt request reply was sent, false otherwise.
2446 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2447 struct batadv_tvlv_tt_data *tt_data,
2448 uint8_t *req_src, uint8_t *req_dst)
2450 struct batadv_orig_node *req_dst_orig_node;
2451 struct batadv_orig_node *res_dst_orig_node = NULL;
2452 struct batadv_tvlv_tt_change *tt_change;
2453 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2454 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2455 bool ret = false, full_table;
2456 uint8_t orig_ttvn, req_ttvn;
2460 batadv_dbg(BATADV_DBG_TT, bat_priv,
2461 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2462 req_src, tt_data->ttvn, req_dst,
2463 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2465 /* Let's get the orig node of the REAL destination */
2466 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2467 if (!req_dst_orig_node)
2470 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2471 if (!res_dst_orig_node)
2474 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2475 req_ttvn = tt_data->ttvn;
2477 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2478 /* this node doesn't have the requested data */
2479 if (orig_ttvn != req_ttvn ||
2480 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2481 ntohs(tt_data->num_vlan)))
2484 /* If the full table has been explicitly requested */
2485 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2486 !req_dst_orig_node->tt_buff)
2491 /* TT fragmentation hasn't been implemented yet, so send as many
2492 * TT entries fit a single packet as possible only
2495 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2496 tt_len = req_dst_orig_node->tt_buff_len;
2498 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2505 /* Copy the last orig_node's OGM buffer */
2506 memcpy(tt_change, req_dst_orig_node->tt_buff,
2507 req_dst_orig_node->tt_buff_len);
2508 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2510 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2511 * in the initial part
2514 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2521 /* fill the rest of the tvlv with the real TT entries */
2522 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2524 batadv_tt_global_valid,
2528 /* Don't send the response, if larger than fragmented packet. */
2529 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2530 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2531 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2532 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2533 res_dst_orig_node->orig);
2537 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2538 tvlv_tt_data->ttvn = req_ttvn;
2541 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2543 batadv_dbg(BATADV_DBG_TT, bat_priv,
2544 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2545 res_dst_orig_node->orig, req_dst_orig_node->orig,
2546 full_table ? 'F' : '.', req_ttvn);
2548 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2550 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2551 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2558 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2561 if (res_dst_orig_node)
2562 batadv_orig_node_free_ref(res_dst_orig_node);
2563 if (req_dst_orig_node)
2564 batadv_orig_node_free_ref(req_dst_orig_node);
2565 kfree(tvlv_tt_data);
2570 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2572 * @bat_priv: the bat priv with all the soft interface information
2573 * @tt_data: tt data containing the tt request information
2574 * @req_src: mac address of tt request sender
2576 * Returns true if tt request reply was sent, false otherwise.
2578 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2579 struct batadv_tvlv_tt_data *tt_data,
2582 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2583 struct batadv_hard_iface *primary_if = NULL;
2584 struct batadv_tvlv_tt_change *tt_change;
2585 struct batadv_orig_node *orig_node;
2586 uint8_t my_ttvn, req_ttvn;
2591 batadv_dbg(BATADV_DBG_TT, bat_priv,
2592 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2593 req_src, tt_data->ttvn,
2594 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2596 spin_lock_bh(&bat_priv->tt.commit_lock);
2598 my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2599 req_ttvn = tt_data->ttvn;
2601 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2605 primary_if = batadv_primary_if_get_selected(bat_priv);
2609 /* If the full table has been explicitly requested or the gap
2610 * is too big send the whole local translation table
2612 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2613 !bat_priv->tt.last_changeset)
2618 /* TT fragmentation hasn't been implemented yet, so send as many
2619 * TT entries fit a single packet as possible only
2622 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2624 tt_len = bat_priv->tt.last_changeset_len;
2625 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2632 /* Copy the last orig_node's OGM buffer */
2633 memcpy(tt_change, bat_priv->tt.last_changeset,
2634 bat_priv->tt.last_changeset_len);
2635 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2637 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2639 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2640 * in the initial part
2643 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2650 /* fill the rest of the tvlv with the real TT entries */
2651 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2653 batadv_tt_local_valid, NULL);
2656 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2657 tvlv_tt_data->ttvn = req_ttvn;
2660 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2662 batadv_dbg(BATADV_DBG_TT, bat_priv,
2663 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2664 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2666 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2668 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2669 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2675 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2677 spin_unlock_bh(&bat_priv->tt.commit_lock);
2679 batadv_orig_node_free_ref(orig_node);
2681 batadv_hardif_free_ref(primary_if);
2682 kfree(tvlv_tt_data);
2683 /* The packet was for this host, so it doesn't need to be re-routed */
2688 * batadv_send_tt_response - send reply to tt request
2689 * @bat_priv: the bat priv with all the soft interface information
2690 * @tt_data: tt data containing the tt request information
2691 * @req_src: mac address of tt request sender
2692 * @req_dst: mac address of tt request recipient
2694 * Returns true if tt request reply was sent, false otherwise.
2696 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2697 struct batadv_tvlv_tt_data *tt_data,
2698 uint8_t *req_src, uint8_t *req_dst)
2700 if (batadv_is_my_mac(bat_priv, req_dst))
2701 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2703 return batadv_send_other_tt_response(bat_priv, tt_data,
2707 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2708 struct batadv_orig_node *orig_node,
2709 struct batadv_tvlv_tt_change *tt_change,
2710 uint16_t tt_num_changes, uint8_t ttvn)
2715 for (i = 0; i < tt_num_changes; i++) {
2716 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2717 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2718 batadv_tt_global_del(bat_priv, orig_node,
2719 (tt_change + i)->addr,
2720 ntohs((tt_change + i)->vid),
2721 "tt removed by changes",
2724 if (!batadv_tt_global_add(bat_priv, orig_node,
2725 (tt_change + i)->addr,
2726 ntohs((tt_change + i)->vid),
2727 (tt_change + i)->flags, ttvn))
2728 /* In case of problem while storing a
2729 * global_entry, we stop the updating
2730 * procedure without committing the
2731 * ttvn change. This will avoid to send
2732 * corrupted data on tt_request
2737 orig_node->tt_initialised = true;
2740 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2741 struct batadv_tvlv_tt_change *tt_change,
2742 uint8_t ttvn, uint8_t *resp_src,
2743 uint16_t num_entries)
2745 struct batadv_orig_node *orig_node;
2747 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2751 /* Purge the old table first.. */
2752 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2753 "Received full table");
2755 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2758 spin_lock_bh(&orig_node->tt_buff_lock);
2759 kfree(orig_node->tt_buff);
2760 orig_node->tt_buff_len = 0;
2761 orig_node->tt_buff = NULL;
2762 spin_unlock_bh(&orig_node->tt_buff_lock);
2764 atomic_set(&orig_node->last_ttvn, ttvn);
2768 batadv_orig_node_free_ref(orig_node);
2771 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2772 struct batadv_orig_node *orig_node,
2773 uint16_t tt_num_changes, uint8_t ttvn,
2774 struct batadv_tvlv_tt_change *tt_change)
2776 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2777 tt_num_changes, ttvn);
2779 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2780 batadv_tt_len(tt_num_changes));
2781 atomic_set(&orig_node->last_ttvn, ttvn);
2785 * batadv_is_my_client - check if a client is served by the local node
2786 * @bat_priv: the bat priv with all the soft interface information
2787 * @addr: the mac adress of the client to check
2788 * @vid: VLAN identifier
2790 * Returns true if the client is served by this node, false otherwise.
2792 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2795 struct batadv_tt_local_entry *tt_local_entry;
2798 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2799 if (!tt_local_entry)
2801 /* Check if the client has been logically deleted (but is kept for
2802 * consistency purpose)
2804 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2805 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2810 batadv_tt_local_entry_free_ref(tt_local_entry);
2815 * batadv_handle_tt_response - process incoming tt reply
2816 * @bat_priv: the bat priv with all the soft interface information
2817 * @tt_data: tt data containing the tt request information
2818 * @resp_src: mac address of tt reply sender
2819 * @num_entries: number of tt change entries appended to the tt data
2821 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2822 struct batadv_tvlv_tt_data *tt_data,
2823 uint8_t *resp_src, uint16_t num_entries)
2825 struct batadv_tt_req_node *node, *safe;
2826 struct batadv_orig_node *orig_node = NULL;
2827 struct batadv_tvlv_tt_change *tt_change;
2828 uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2829 uint16_t change_offset;
2831 batadv_dbg(BATADV_DBG_TT, bat_priv,
2832 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2833 resp_src, tt_data->ttvn, num_entries,
2834 (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2836 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2840 spin_lock_bh(&orig_node->tt_lock);
2842 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2843 change_offset *= ntohs(tt_data->num_vlan);
2844 change_offset += sizeof(*tt_data);
2845 tvlv_ptr += change_offset;
2847 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2848 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2849 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2850 resp_src, num_entries);
2852 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2853 tt_data->ttvn, tt_change);
2856 /* Recalculate the CRC for this orig_node and store it */
2857 batadv_tt_global_update_crc(bat_priv, orig_node);
2859 spin_unlock_bh(&orig_node->tt_lock);
2861 /* Delete the tt_req_node from pending tt_requests list */
2862 spin_lock_bh(&bat_priv->tt.req_list_lock);
2863 list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2864 if (!batadv_compare_eth(node->addr, resp_src))
2866 list_del(&node->list);
2870 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2873 batadv_orig_node_free_ref(orig_node);
2876 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2878 struct batadv_tt_roam_node *node, *safe;
2880 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2882 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2883 list_del(&node->list);
2887 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2890 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2892 struct batadv_tt_roam_node *node, *safe;
2894 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2895 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2896 if (!batadv_has_timed_out(node->first_time,
2897 BATADV_ROAMING_MAX_TIME))
2900 list_del(&node->list);
2903 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2906 /* This function checks whether the client already reached the
2907 * maximum number of possible roaming phases. In this case the ROAMING_ADV
2910 * returns true if the ROAMING_ADV can be sent, false otherwise
2912 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2915 struct batadv_tt_roam_node *tt_roam_node;
2918 spin_lock_bh(&bat_priv->tt.roam_list_lock);
2919 /* The new tt_req will be issued only if I'm not waiting for a
2920 * reply from the same orig_node yet
2922 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2923 if (!batadv_compare_eth(tt_roam_node->addr, client))
2926 if (batadv_has_timed_out(tt_roam_node->first_time,
2927 BATADV_ROAMING_MAX_TIME))
2930 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2931 /* Sorry, you roamed too many times! */
2938 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2942 tt_roam_node->first_time = jiffies;
2943 atomic_set(&tt_roam_node->counter,
2944 BATADV_ROAMING_MAX_COUNT - 1);
2945 ether_addr_copy(tt_roam_node->addr, client);
2947 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2952 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2957 * batadv_send_roam_adv - send a roaming advertisement message
2958 * @bat_priv: the bat priv with all the soft interface information
2959 * @client: mac address of the roaming client
2960 * @vid: VLAN identifier
2961 * @orig_node: message destination
2963 * Send a ROAMING_ADV message to the node which was previously serving this
2964 * client. This is done to inform the node that from now on all traffic destined
2965 * for this particular roamed client has to be forwarded to the sender of the
2968 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2970 struct batadv_orig_node *orig_node)
2972 struct batadv_hard_iface *primary_if;
2973 struct batadv_tvlv_roam_adv tvlv_roam;
2975 primary_if = batadv_primary_if_get_selected(bat_priv);
2979 /* before going on we have to check whether the client has
2980 * already roamed to us too many times
2982 if (!batadv_tt_check_roam_count(bat_priv, client))
2985 batadv_dbg(BATADV_DBG_TT, bat_priv,
2986 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2987 orig_node->orig, client, BATADV_PRINT_VID(vid));
2989 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2991 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2992 tvlv_roam.vid = htons(vid);
2994 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2995 orig_node->orig, BATADV_TVLV_ROAM, 1,
2996 &tvlv_roam, sizeof(tvlv_roam));
3000 batadv_hardif_free_ref(primary_if);
3003 static void batadv_tt_purge(struct work_struct *work)
3005 struct delayed_work *delayed_work;
3006 struct batadv_priv_tt *priv_tt;
3007 struct batadv_priv *bat_priv;
3009 delayed_work = container_of(work, struct delayed_work, work);
3010 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3011 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3013 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3014 batadv_tt_global_purge(bat_priv);
3015 batadv_tt_req_purge(bat_priv);
3016 batadv_tt_roam_purge(bat_priv);
3018 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3019 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3022 void batadv_tt_free(struct batadv_priv *bat_priv)
3024 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3025 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3027 cancel_delayed_work_sync(&bat_priv->tt.work);
3029 batadv_tt_local_table_free(bat_priv);
3030 batadv_tt_global_table_free(bat_priv);
3031 batadv_tt_req_list_free(bat_priv);
3032 batadv_tt_changes_list_free(bat_priv);
3033 batadv_tt_roam_list_free(bat_priv);
3035 kfree(bat_priv->tt.last_changeset);
3039 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3040 * table and possibly count them in the TT size
3041 * @bat_priv: the bat priv with all the soft interface information
3042 * @flags: the flag to switch
3043 * @enable: whether to set or unset the flag
3044 * @count: whether to increase the TT size by the number of changed entries
3046 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3047 uint16_t flags, bool enable, bool count)
3049 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3050 struct batadv_tt_common_entry *tt_common_entry;
3051 uint16_t changed_num = 0;
3052 struct hlist_head *head;
3058 for (i = 0; i < hash->size; i++) {
3059 head = &hash->table[i];
3062 hlist_for_each_entry_rcu(tt_common_entry,
3065 if ((tt_common_entry->flags & flags) == flags)
3067 tt_common_entry->flags |= flags;
3069 if (!(tt_common_entry->flags & flags))
3071 tt_common_entry->flags &= ~flags;
3078 batadv_tt_local_size_inc(bat_priv,
3079 tt_common_entry->vid);
3085 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3086 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3088 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3089 struct batadv_tt_common_entry *tt_common;
3090 struct batadv_tt_local_entry *tt_local;
3091 struct hlist_node *node_tmp;
3092 struct hlist_head *head;
3093 spinlock_t *list_lock; /* protects write access to the hash lists */
3099 for (i = 0; i < hash->size; i++) {
3100 head = &hash->table[i];
3101 list_lock = &hash->list_locks[i];
3103 spin_lock_bh(list_lock);
3104 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3106 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3109 batadv_dbg(BATADV_DBG_TT, bat_priv,
3110 "Deleting local tt entry (%pM, vid: %d): pending\n",
3112 BATADV_PRINT_VID(tt_common->vid));
3114 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3115 hlist_del_rcu(&tt_common->hash_entry);
3116 tt_local = container_of(tt_common,
3117 struct batadv_tt_local_entry,
3119 batadv_tt_local_entry_free_ref(tt_local);
3121 spin_unlock_bh(list_lock);
3126 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3127 * which have been queued in the time since the last commit
3128 * @bat_priv: the bat priv with all the soft interface information
3130 * Caller must hold tt->commit_lock.
3132 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3134 /* Update multicast addresses in local translation table */
3135 batadv_mcast_mla_update(bat_priv);
3137 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3138 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3139 batadv_tt_tvlv_container_update(bat_priv);
3143 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3145 batadv_tt_local_purge_pending_clients(bat_priv);
3146 batadv_tt_local_update_crc(bat_priv);
3148 /* Increment the TTVN only once per OGM interval */
3149 atomic_inc(&bat_priv->tt.vn);
3150 batadv_dbg(BATADV_DBG_TT, bat_priv,
3151 "Local changes committed, updating to ttvn %u\n",
3152 (uint8_t)atomic_read(&bat_priv->tt.vn));
3154 /* reset the sending counter */
3155 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3156 batadv_tt_tvlv_container_update(bat_priv);
3160 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3161 * have been queued in the time since the last commit
3162 * @bat_priv: the bat priv with all the soft interface information
3164 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3166 spin_lock_bh(&bat_priv->tt.commit_lock);
3167 batadv_tt_local_commit_changes_nolock(bat_priv);
3168 spin_unlock_bh(&bat_priv->tt.commit_lock);
3171 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3172 uint8_t *dst, unsigned short vid)
3174 struct batadv_tt_local_entry *tt_local_entry = NULL;
3175 struct batadv_tt_global_entry *tt_global_entry = NULL;
3176 struct batadv_softif_vlan *vlan;
3179 vlan = batadv_softif_vlan_get(bat_priv, vid);
3180 if (!vlan || !atomic_read(&vlan->ap_isolation))
3183 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3184 if (!tt_local_entry)
3187 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3188 if (!tt_global_entry)
3191 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3198 batadv_softif_vlan_free_ref(vlan);
3199 if (tt_global_entry)
3200 batadv_tt_global_entry_free_ref(tt_global_entry);
3202 batadv_tt_local_entry_free_ref(tt_local_entry);
3207 * batadv_tt_update_orig - update global translation table with new tt
3208 * information received via ogms
3209 * @bat_priv: the bat priv with all the soft interface information
3210 * @orig: the orig_node of the ogm
3211 * @tt_vlan: pointer to the first tvlv VLAN entry
3212 * @tt_num_vlan: number of tvlv VLAN entries
3213 * @tt_change: pointer to the first entry in the TT buffer
3214 * @tt_num_changes: number of tt changes inside the tt buffer
3215 * @ttvn: translation table version number of this changeset
3216 * @tt_crc: crc32 checksum of orig node's translation table
3218 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3219 struct batadv_orig_node *orig_node,
3220 const void *tt_buff, uint16_t tt_num_vlan,
3221 struct batadv_tvlv_tt_change *tt_change,
3222 uint16_t tt_num_changes, uint8_t ttvn)
3224 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3225 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3226 bool full_table = true;
3228 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3229 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3230 * increased by one -> we can apply the attached changes
3232 if ((!orig_node->tt_initialised && ttvn == 1) ||
3233 ttvn - orig_ttvn == 1) {
3234 /* the OGM could not contain the changes due to their size or
3235 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3237 * In this case send a tt request
3239 if (!tt_num_changes) {
3244 spin_lock_bh(&orig_node->tt_lock);
3246 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3249 /* Even if we received the precomputed crc with the OGM, we
3250 * prefer to recompute it to spot any possible inconsistency
3251 * in the global table
3253 batadv_tt_global_update_crc(bat_priv, orig_node);
3255 spin_unlock_bh(&orig_node->tt_lock);
3257 /* The ttvn alone is not enough to guarantee consistency
3258 * because a single value could represent different states
3259 * (due to the wrap around). Thus a node has to check whether
3260 * the resulting table (after applying the changes) is still
3261 * consistent or not. E.g. a node could disconnect while its
3262 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3263 * checking the CRC value is mandatory to detect the
3266 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3270 /* if we missed more than one change or our tables are not
3271 * in sync anymore -> request fresh tt data
3273 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3274 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3277 batadv_dbg(BATADV_DBG_TT, bat_priv,
3278 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3279 orig_node->orig, ttvn, orig_ttvn,
3281 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3282 tt_vlan, tt_num_vlan,
3290 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3291 * @bat_priv: the bat priv with all the soft interface information
3292 * @addr: the mac address of the client to check
3293 * @vid: VLAN identifier
3295 * Returns true if we know that the client has moved from its old originator
3296 * to another one. This entry is still kept for consistency purposes and will be
3297 * deleted later by a DEL or because of timeout
3299 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3300 uint8_t *addr, unsigned short vid)
3302 struct batadv_tt_global_entry *tt_global_entry;
3305 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3306 if (!tt_global_entry)
3309 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3310 batadv_tt_global_entry_free_ref(tt_global_entry);
3316 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3317 * @bat_priv: the bat priv with all the soft interface information
3318 * @addr: the mac address of the local client to query
3319 * @vid: VLAN identifier
3321 * Returns true if the local client is known to be roaming (it is not served by
3322 * this node anymore) or not. If yes, the client is still present in the table
3323 * to keep the latter consistent with the node TTVN
3325 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3326 uint8_t *addr, unsigned short vid)
3328 struct batadv_tt_local_entry *tt_local_entry;
3331 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3332 if (!tt_local_entry)
3335 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3336 batadv_tt_local_entry_free_ref(tt_local_entry);
3341 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3342 struct batadv_orig_node *orig_node,
3343 const unsigned char *addr,
3348 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3349 BATADV_TT_CLIENT_TEMP,
3350 atomic_read(&orig_node->last_ttvn)))
3353 batadv_dbg(BATADV_DBG_TT, bat_priv,
3354 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3355 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3362 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3363 * maximum packet size that can be transported through the mesh
3364 * @soft_iface: netdev struct of the mesh interface
3366 * Remove entries older than 'timeout' and half timeout if more entries need
3369 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3371 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3372 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3373 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3374 bool reduced = false;
3376 spin_lock_bh(&bat_priv->tt.commit_lock);
3379 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3380 if (packet_size_max >= table_size)
3383 batadv_tt_local_purge(bat_priv, timeout);
3384 batadv_tt_local_purge_pending_clients(bat_priv);
3388 net_ratelimited_function(batadv_info, soft_iface,
3389 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3393 /* commit these changes immediately, to avoid synchronization problem
3397 batadv_tt_local_commit_changes_nolock(bat_priv);
3399 spin_unlock_bh(&bat_priv->tt.commit_lock);
3403 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3404 * @bat_priv: the bat priv with all the soft interface information
3405 * @orig: the orig_node of the ogm
3406 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3407 * @tvlv_value: tvlv buffer containing the gateway data
3408 * @tvlv_value_len: tvlv buffer length
3410 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3411 struct batadv_orig_node *orig,
3412 uint8_t flags, void *tvlv_value,
3413 uint16_t tvlv_value_len)
3415 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3416 struct batadv_tvlv_tt_change *tt_change;
3417 struct batadv_tvlv_tt_data *tt_data;
3418 uint16_t num_entries, num_vlan;
3420 if (tvlv_value_len < sizeof(*tt_data))
3423 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3424 tvlv_value_len -= sizeof(*tt_data);
3426 num_vlan = ntohs(tt_data->num_vlan);
3428 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3431 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3432 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3433 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3435 num_entries = batadv_tt_entries(tvlv_value_len);
3437 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3438 num_entries, tt_data->ttvn);
3442 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3444 * @bat_priv: the bat priv with all the soft interface information
3445 * @src: mac address of tt tvlv sender
3446 * @dst: mac address of tt tvlv recipient
3447 * @tvlv_value: tvlv buffer containing the tt data
3448 * @tvlv_value_len: tvlv buffer length
3450 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3453 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3454 uint8_t *src, uint8_t *dst,
3456 uint16_t tvlv_value_len)
3458 struct batadv_tvlv_tt_data *tt_data;
3459 uint16_t tt_vlan_len, tt_num_entries;
3463 if (tvlv_value_len < sizeof(*tt_data))
3464 return NET_RX_SUCCESS;
3466 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3467 tvlv_value_len -= sizeof(*tt_data);
3469 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3470 tt_vlan_len *= ntohs(tt_data->num_vlan);
3472 if (tvlv_value_len < tt_vlan_len)
3473 return NET_RX_SUCCESS;
3475 tvlv_value_len -= tt_vlan_len;
3476 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3478 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3479 case BATADV_TT_REQUEST:
3480 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3482 /* If this node cannot provide a TT response the tt_request is
3485 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3487 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3492 batadv_dbg(BATADV_DBG_TT, bat_priv,
3493 "Routing TT_REQUEST to %pM [%c]\n",
3495 /* tvlv API will re-route the packet */
3499 case BATADV_TT_RESPONSE:
3500 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3502 if (batadv_is_my_mac(bat_priv, dst)) {
3503 batadv_handle_tt_response(bat_priv, tt_data,
3504 src, tt_num_entries);
3505 return NET_RX_SUCCESS;
3508 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3513 batadv_dbg(BATADV_DBG_TT, bat_priv,
3514 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3516 /* tvlv API will re-route the packet */
3520 return NET_RX_SUCCESS;
3524 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3525 * @bat_priv: the bat priv with all the soft interface information
3526 * @src: mac address of tt tvlv sender
3527 * @dst: mac address of tt tvlv recipient
3528 * @tvlv_value: tvlv buffer containing the tt data
3529 * @tvlv_value_len: tvlv buffer length
3531 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3534 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3535 uint8_t *src, uint8_t *dst,
3537 uint16_t tvlv_value_len)
3539 struct batadv_tvlv_roam_adv *roaming_adv;
3540 struct batadv_orig_node *orig_node = NULL;
3542 /* If this node is not the intended recipient of the
3543 * roaming advertisement the packet is forwarded
3544 * (the tvlv API will re-route the packet).
3546 if (!batadv_is_my_mac(bat_priv, dst))
3549 if (tvlv_value_len < sizeof(*roaming_adv))
3552 orig_node = batadv_orig_hash_find(bat_priv, src);
3556 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3557 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3559 batadv_dbg(BATADV_DBG_TT, bat_priv,
3560 "Received ROAMING_ADV from %pM (client %pM)\n",
3561 src, roaming_adv->client);
3563 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3564 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3565 atomic_read(&orig_node->last_ttvn) + 1);
3569 batadv_orig_node_free_ref(orig_node);
3570 return NET_RX_SUCCESS;
3574 * batadv_tt_init - initialise the translation table internals
3575 * @bat_priv: the bat priv with all the soft interface information
3577 * Return 0 on success or negative error number in case of failure.
3579 int batadv_tt_init(struct batadv_priv *bat_priv)
3583 /* synchronized flags must be remote */
3584 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3586 ret = batadv_tt_local_init(bat_priv);
3590 ret = batadv_tt_global_init(bat_priv);
3594 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3595 batadv_tt_tvlv_unicast_handler_v1,
3596 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3598 batadv_tvlv_handler_register(bat_priv, NULL,
3599 batadv_roam_tvlv_unicast_handler_v1,
3600 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3602 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3603 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3604 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3610 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3611 * @bat_priv: the bat priv with all the soft interface information
3612 * @addr: the mac address of the client
3613 * @vid: the identifier of the VLAN where this client is connected
3615 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3618 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3619 const uint8_t *addr, unsigned short vid)
3621 struct batadv_tt_global_entry *tt;
3624 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3628 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3630 batadv_tt_global_entry_free_ref(tt);