1 /* Copyright (C) 2007-2015 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/>.
18 #include "translation-table.h"
21 #include <linux/atomic.h>
22 #include <linux/bitops.h>
23 #include <linux/bug.h>
24 #include <linux/byteorder/generic.h>
25 #include <linux/compiler.h>
26 #include <linux/crc32c.h>
27 #include <linux/errno.h>
28 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/jhash.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/rculist.h>
38 #include <linux/rcupdate.h>
39 #include <linux/seq_file.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/stddef.h>
43 #include <linux/string.h>
44 #include <linux/workqueue.h>
45 #include <net/net_namespace.h>
47 #include "bridge_loop_avoidance.h"
48 #include "hard-interface.h"
50 #include "multicast.h"
51 #include "originator.h"
53 #include "soft-interface.h"
56 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
57 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
59 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
61 struct batadv_orig_node *orig_node);
62 static void batadv_tt_purge(struct work_struct *work);
64 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
65 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
66 struct batadv_orig_node *orig_node,
67 const unsigned char *addr,
68 unsigned short vid, const char *message,
71 /* returns 1 if they are the same mac addr and vid */
72 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
74 const void *data1 = container_of(node, struct batadv_tt_common_entry,
76 const struct batadv_tt_common_entry *tt1 = data1;
77 const struct batadv_tt_common_entry *tt2 = data2;
79 return (tt1->vid == tt2->vid) && batadv_compare_eth(data1, data2);
83 * batadv_choose_tt - return the index of the tt entry in the hash table
84 * @data: pointer to the tt_common_entry object to map
85 * @size: the size of the hash table
87 * Returns the hash index where the object represented by 'data' should be
90 static inline u32 batadv_choose_tt(const void *data, u32 size)
92 struct batadv_tt_common_entry *tt;
95 tt = (struct batadv_tt_common_entry *)data;
96 hash = jhash(&tt->addr, ETH_ALEN, hash);
97 hash = jhash(&tt->vid, sizeof(tt->vid), hash);
103 * batadv_tt_hash_find - look for a client in the given hash table
104 * @hash: the hash table to search
105 * @addr: the mac address of the client to look for
106 * @vid: VLAN identifier
108 * Returns a pointer to the tt_common struct belonging to the searched client if
109 * found, NULL otherwise.
111 static struct batadv_tt_common_entry *
112 batadv_tt_hash_find(struct batadv_hashtable *hash, const u8 *addr,
115 struct hlist_head *head;
116 struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
122 ether_addr_copy(to_search.addr, addr);
125 index = batadv_choose_tt(&to_search, hash->size);
126 head = &hash->table[index];
129 hlist_for_each_entry_rcu(tt, head, hash_entry) {
130 if (!batadv_compare_eth(tt, addr))
136 if (!atomic_inc_not_zero(&tt->refcount))
148 * batadv_tt_local_hash_find - search the local table for a given client
149 * @bat_priv: the bat priv with all the soft interface information
150 * @addr: the mac address of the client to look for
151 * @vid: VLAN identifier
153 * Returns a pointer to the corresponding tt_local_entry struct if the client is
154 * found, NULL otherwise.
156 static struct batadv_tt_local_entry *
157 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
160 struct batadv_tt_common_entry *tt_common_entry;
161 struct batadv_tt_local_entry *tt_local_entry = NULL;
163 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
166 tt_local_entry = container_of(tt_common_entry,
167 struct batadv_tt_local_entry,
169 return tt_local_entry;
173 * batadv_tt_global_hash_find - search the global table for a given client
174 * @bat_priv: the bat priv with all the soft interface information
175 * @addr: the mac address of the client to look for
176 * @vid: VLAN identifier
178 * Returns a pointer to the corresponding tt_global_entry struct if the client
179 * is found, NULL otherwise.
181 static struct batadv_tt_global_entry *
182 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
185 struct batadv_tt_common_entry *tt_common_entry;
186 struct batadv_tt_global_entry *tt_global_entry = NULL;
188 tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
191 tt_global_entry = container_of(tt_common_entry,
192 struct batadv_tt_global_entry,
194 return tt_global_entry;
198 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
200 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
201 kfree_rcu(tt_local_entry, common.rcu);
205 * batadv_tt_global_entry_free_ref - decrement the refcounter for a
206 * tt_global_entry and possibly free it
207 * @tt_global_entry: the object to free
210 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
212 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
213 batadv_tt_global_del_orig_list(tt_global_entry);
214 kfree_rcu(tt_global_entry, common.rcu);
219 * batadv_tt_global_hash_count - count the number of orig entries
220 * @hash: hash table containing the tt entries
221 * @addr: the mac address of the client to count entries for
222 * @vid: VLAN identifier
224 * Return the number of originators advertising the given address/data
225 * (excluding ourself).
227 int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
228 const u8 *addr, unsigned short vid)
230 struct batadv_tt_global_entry *tt_global_entry;
233 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
234 if (!tt_global_entry)
237 count = atomic_read(&tt_global_entry->orig_list_count);
238 batadv_tt_global_entry_free_ref(tt_global_entry);
244 * batadv_tt_local_size_mod - change the size by v of the local table identified
246 * @bat_priv: the bat priv with all the soft interface information
247 * @vid: the VLAN identifier of the sub-table to change
248 * @v: the amount to sum to the local table size
250 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
251 unsigned short vid, int v)
253 struct batadv_softif_vlan *vlan;
255 vlan = batadv_softif_vlan_get(bat_priv, vid);
259 atomic_add(v, &vlan->tt.num_entries);
261 batadv_softif_vlan_free_ref(vlan);
265 * batadv_tt_local_size_inc - increase by one the local table size for the given
267 * @bat_priv: the bat priv with all the soft interface information
268 * @vid: the VLAN identifier
270 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
273 batadv_tt_local_size_mod(bat_priv, vid, 1);
277 * batadv_tt_local_size_dec - decrease by one the local table size for the given
279 * @bat_priv: the bat priv with all the soft interface information
280 * @vid: the VLAN identifier
282 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
285 batadv_tt_local_size_mod(bat_priv, vid, -1);
289 * batadv_tt_global_size_mod - change the size by v of the local table
291 * @bat_priv: the bat priv with all the soft interface information
292 * @vid: the VLAN identifier
293 * @v: the amount to sum to the global table size
295 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
296 unsigned short vid, int v)
298 struct batadv_orig_node_vlan *vlan;
300 vlan = batadv_orig_node_vlan_new(orig_node, vid);
304 if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
305 spin_lock_bh(&orig_node->vlan_list_lock);
306 if (!hlist_unhashed(&vlan->list)) {
307 hlist_del_init_rcu(&vlan->list);
308 batadv_orig_node_vlan_free_ref(vlan);
310 spin_unlock_bh(&orig_node->vlan_list_lock);
313 batadv_orig_node_vlan_free_ref(vlan);
317 * batadv_tt_global_size_inc - increase by one the global table size for the
319 * @orig_node: the originator which global table size has to be decreased
320 * @vid: the vlan identifier
322 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
325 batadv_tt_global_size_mod(orig_node, vid, 1);
329 * batadv_tt_global_size_dec - decrease by one the global table size for the
331 * @orig_node: the originator which global table size has to be decreased
332 * @vid: the vlan identifier
334 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
337 batadv_tt_global_size_mod(orig_node, vid, -1);
341 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
342 * queue for free after rcu grace period
343 * @orig_entry: tt orig entry to be free'd
346 batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry)
348 batadv_orig_node_free_ref(orig_entry->orig_node);
349 kfree_rcu(orig_entry, rcu);
353 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
355 if (!atomic_dec_and_test(&orig_entry->refcount))
358 batadv_tt_orig_list_entry_release(orig_entry);
362 * batadv_tt_local_event - store a local TT event (ADD/DEL)
363 * @bat_priv: the bat priv with all the soft interface information
364 * @tt_local_entry: the TT entry involved in the event
365 * @event_flags: flags to store in the event structure
367 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
368 struct batadv_tt_local_entry *tt_local_entry,
371 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
372 struct batadv_tt_common_entry *common = &tt_local_entry->common;
373 u8 flags = common->flags | event_flags;
374 bool event_removed = false;
375 bool del_op_requested, del_op_entry;
377 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
381 tt_change_node->change.flags = flags;
382 memset(tt_change_node->change.reserved, 0,
383 sizeof(tt_change_node->change.reserved));
384 ether_addr_copy(tt_change_node->change.addr, common->addr);
385 tt_change_node->change.vid = htons(common->vid);
387 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
389 /* check for ADD+DEL or DEL+ADD events */
390 spin_lock_bh(&bat_priv->tt.changes_list_lock);
391 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
393 if (!batadv_compare_eth(entry->change.addr, common->addr))
396 /* DEL+ADD in the same orig interval have no effect and can be
397 * removed to avoid silly behaviour on the receiver side. The
398 * other way around (ADD+DEL) can happen in case of roaming of
399 * a client still in the NEW state. Roaming of NEW clients is
400 * now possible due to automatically recognition of "temporary"
403 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
404 if (!del_op_requested && del_op_entry)
406 if (del_op_requested && !del_op_entry)
409 /* this is a second add in the same originator interval. It
410 * means that flags have been changed: update them!
412 if (!del_op_requested && !del_op_entry)
413 entry->change.flags = flags;
417 list_del(&entry->list);
419 kfree(tt_change_node);
420 event_removed = true;
424 /* track the change in the OGMinterval list */
425 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
428 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
431 atomic_dec(&bat_priv->tt.local_changes);
433 atomic_inc(&bat_priv->tt.local_changes);
437 * batadv_tt_len - compute length in bytes of given number of tt changes
438 * @changes_num: number of tt changes
440 * Returns computed length in bytes.
442 static int batadv_tt_len(int changes_num)
444 return changes_num * sizeof(struct batadv_tvlv_tt_change);
448 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
449 * @tt_len: available space
451 * Returns the number of entries.
453 static u16 batadv_tt_entries(u16 tt_len)
455 return tt_len / batadv_tt_len(1);
459 * batadv_tt_local_table_transmit_size - calculates the local translation table
460 * size when transmitted over the air
461 * @bat_priv: the bat priv with all the soft interface information
463 * Returns local translation table size in bytes.
465 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
468 u16 tt_local_entries = 0;
469 struct batadv_softif_vlan *vlan;
473 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
475 tt_local_entries += atomic_read(&vlan->tt.num_entries);
479 /* header size of tvlv encapsulated tt response payload */
480 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
481 hdr_size += sizeof(struct batadv_tvlv_hdr);
482 hdr_size += sizeof(struct batadv_tvlv_tt_data);
483 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
485 return hdr_size + batadv_tt_len(tt_local_entries);
488 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
490 if (bat_priv->tt.local_hash)
493 bat_priv->tt.local_hash = batadv_hash_new(1024);
495 if (!bat_priv->tt.local_hash)
498 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
499 &batadv_tt_local_hash_lock_class_key);
504 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
505 struct batadv_tt_global_entry *tt_global,
508 batadv_dbg(BATADV_DBG_TT, bat_priv,
509 "Deleting global tt entry %pM (vid: %d): %s\n",
510 tt_global->common.addr,
511 BATADV_PRINT_VID(tt_global->common.vid), message);
513 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
514 batadv_choose_tt, &tt_global->common);
515 batadv_tt_global_entry_free_ref(tt_global);
519 * batadv_tt_local_add - add a new client to the local table or update an
521 * @soft_iface: netdev struct of the mesh interface
522 * @addr: the mac address of the client to add
523 * @vid: VLAN identifier
524 * @ifindex: index of the interface where the client is connected to (useful to
525 * identify wireless clients)
526 * @mark: the value contained in the skb->mark field of the received packet (if
529 * Returns true if the client was successfully added, false otherwise.
531 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
532 unsigned short vid, int ifindex, u32 mark)
534 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
535 struct batadv_tt_local_entry *tt_local;
536 struct batadv_tt_global_entry *tt_global = NULL;
537 struct batadv_softif_vlan *vlan;
538 struct net_device *in_dev = NULL;
539 struct hlist_head *head;
540 struct batadv_tt_orig_list_entry *orig_entry;
541 int hash_added, table_size, packet_size_max;
543 bool roamed_back = false;
547 if (ifindex != BATADV_NULL_IFINDEX)
548 in_dev = dev_get_by_index(&init_net, ifindex);
550 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
552 if (!is_multicast_ether_addr(addr))
553 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
556 tt_local->last_seen = jiffies;
557 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
558 batadv_dbg(BATADV_DBG_TT, bat_priv,
559 "Re-adding pending client %pM (vid: %d)\n",
560 addr, BATADV_PRINT_VID(vid));
561 /* whatever the reason why the PENDING flag was set,
562 * this is a client which was enqueued to be removed in
563 * this orig_interval. Since it popped up again, the
564 * flag can be reset like it was never enqueued
566 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
570 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
571 batadv_dbg(BATADV_DBG_TT, bat_priv,
572 "Roaming client %pM (vid: %d) came back to its original location\n",
573 addr, BATADV_PRINT_VID(vid));
574 /* the ROAM flag is set because this client roamed away
575 * and the node got a roaming_advertisement message. Now
576 * that the client popped up again at its original
577 * location such flag can be unset
579 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
585 /* Ignore the client if we cannot send it in a full table response. */
586 table_size = batadv_tt_local_table_transmit_size(bat_priv);
587 table_size += batadv_tt_len(1);
588 packet_size_max = atomic_read(&bat_priv->packet_size_max);
589 if (table_size > packet_size_max) {
590 net_ratelimited_function(batadv_info, soft_iface,
591 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
592 table_size, packet_size_max, addr);
596 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
600 /* increase the refcounter of the related vlan */
601 vlan = batadv_softif_vlan_get(bat_priv, vid);
602 if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
603 addr, BATADV_PRINT_VID(vid))) {
609 batadv_dbg(BATADV_DBG_TT, bat_priv,
610 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
611 addr, BATADV_PRINT_VID(vid),
612 (u8)atomic_read(&bat_priv->tt.vn));
614 ether_addr_copy(tt_local->common.addr, addr);
615 /* The local entry has to be marked as NEW to avoid to send it in
616 * a full table response going out before the next ttvn increment
617 * (consistency check)
619 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
620 tt_local->common.vid = vid;
621 if (batadv_is_wifi_netdev(in_dev))
622 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
623 atomic_set(&tt_local->common.refcount, 2);
624 tt_local->last_seen = jiffies;
625 tt_local->common.added_at = tt_local->last_seen;
627 /* the batman interface mac and multicast addresses should never be
630 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
631 is_multicast_ether_addr(addr))
632 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
634 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
635 batadv_choose_tt, &tt_local->common,
636 &tt_local->common.hash_entry);
638 if (unlikely(hash_added != 0)) {
639 /* remove the reference for the hash */
640 batadv_tt_local_entry_free_ref(tt_local);
641 batadv_softif_vlan_free_ref(vlan);
646 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
649 /* Check whether it is a roaming, but don't do anything if the roaming
650 * process has already been handled
652 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
653 /* These node are probably going to update their tt table */
654 head = &tt_global->orig_list;
656 hlist_for_each_entry_rcu(orig_entry, head, list) {
657 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
658 tt_global->common.vid,
659 orig_entry->orig_node);
663 batadv_tt_global_free(bat_priv, tt_global,
667 /* The global entry has to be marked as ROAMING and
668 * has to be kept for consistency purpose
670 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
671 tt_global->roam_at = jiffies;
675 /* store the current remote flags before altering them. This helps
676 * understanding is flags are changing or not
678 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
680 if (batadv_is_wifi_netdev(in_dev))
681 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
683 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
685 /* check the mark in the skb: if it's equal to the configured
686 * isolation_mark, it means the packet is coming from an isolated
689 match_mark = (mark & bat_priv->isolation_mark_mask);
690 if (bat_priv->isolation_mark_mask &&
691 match_mark == bat_priv->isolation_mark)
692 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
694 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
696 /* if any "dynamic" flag has been modified, resend an ADD event for this
697 * entry so that all the nodes can get the new flags
699 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
700 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
707 batadv_tt_local_entry_free_ref(tt_local);
709 batadv_tt_global_entry_free_ref(tt_global);
714 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
715 * within a TT Response directed to another node
716 * @orig_node: originator for which the TT data has to be prepared
717 * @tt_data: uninitialised pointer to the address of the TVLV buffer
718 * @tt_change: uninitialised pointer to the address of the area where the TT
719 * changed can be stored
720 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
721 * function reserves the amount of space needed to send the entire global TT
722 * table. In case of success the value is updated with the real amount of
725 * Allocate the needed amount of memory for the entire TT TVLV and write its
726 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
727 * objects, one per active VLAN served by the originator node.
729 * Return the size of the allocated buffer or 0 in case of failure.
732 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
733 struct batadv_tvlv_tt_data **tt_data,
734 struct batadv_tvlv_tt_change **tt_change,
741 struct batadv_tvlv_tt_vlan_data *tt_vlan;
742 struct batadv_orig_node_vlan *vlan;
746 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
748 num_entries += atomic_read(&vlan->tt.num_entries);
751 change_offset = sizeof(**tt_data);
752 change_offset += num_vlan * sizeof(*tt_vlan);
754 /* if tt_len is negative, allocate the space needed by the full table */
756 *tt_len = batadv_tt_len(num_entries);
759 tvlv_len += change_offset;
761 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
767 (*tt_data)->flags = BATADV_NO_FLAGS;
768 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
769 (*tt_data)->num_vlan = htons(num_vlan);
771 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
772 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
773 tt_vlan->vid = htons(vlan->vid);
774 tt_vlan->crc = htonl(vlan->tt.crc);
779 tt_change_ptr = (u8 *)*tt_data + change_offset;
780 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
788 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
790 * @bat_priv: the bat priv with all the soft interface information
791 * @tt_data: uninitialised pointer to the address of the TVLV buffer
792 * @tt_change: uninitialised pointer to the address of the area where the TT
793 * changes can be stored
794 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
795 * function reserves the amount of space needed to send the entire local TT
796 * table. In case of success the value is updated with the real amount of
799 * Allocate the needed amount of memory for the entire TT TVLV and write its
800 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
801 * objects, one per active VLAN.
803 * Return the size of the allocated buffer or 0 in case of failure.
806 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
807 struct batadv_tvlv_tt_data **tt_data,
808 struct batadv_tvlv_tt_change **tt_change,
811 struct batadv_tvlv_tt_vlan_data *tt_vlan;
812 struct batadv_softif_vlan *vlan;
820 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
822 num_entries += atomic_read(&vlan->tt.num_entries);
825 change_offset = sizeof(**tt_data);
826 change_offset += num_vlan * sizeof(*tt_vlan);
828 /* if tt_len is negative, allocate the space needed by the full table */
830 *tt_len = batadv_tt_len(num_entries);
833 tvlv_len += change_offset;
835 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
841 (*tt_data)->flags = BATADV_NO_FLAGS;
842 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
843 (*tt_data)->num_vlan = htons(num_vlan);
845 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
846 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
847 tt_vlan->vid = htons(vlan->vid);
848 tt_vlan->crc = htonl(vlan->tt.crc);
853 tt_change_ptr = (u8 *)*tt_data + change_offset;
854 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
862 * batadv_tt_tvlv_container_update - update the translation table tvlv container
863 * after local tt changes have been committed
864 * @bat_priv: the bat priv with all the soft interface information
866 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
868 struct batadv_tt_change_node *entry, *safe;
869 struct batadv_tvlv_tt_data *tt_data;
870 struct batadv_tvlv_tt_change *tt_change;
871 int tt_diff_len, tt_change_len = 0;
872 int tt_diff_entries_num = 0;
873 int tt_diff_entries_count = 0;
876 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
877 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
879 /* if we have too many changes for one packet don't send any
880 * and wait for the tt table request which will be fragmented
882 if (tt_diff_len > bat_priv->soft_iface->mtu)
885 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
886 &tt_change, &tt_diff_len);
890 tt_data->flags = BATADV_TT_OGM_DIFF;
892 if (tt_diff_len == 0)
893 goto container_register;
895 spin_lock_bh(&bat_priv->tt.changes_list_lock);
896 atomic_set(&bat_priv->tt.local_changes, 0);
898 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
900 if (tt_diff_entries_count < tt_diff_entries_num) {
901 memcpy(tt_change + tt_diff_entries_count,
903 sizeof(struct batadv_tvlv_tt_change));
904 tt_diff_entries_count++;
906 list_del(&entry->list);
909 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
911 /* Keep the buffer for possible tt_request */
912 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
913 kfree(bat_priv->tt.last_changeset);
914 bat_priv->tt.last_changeset_len = 0;
915 bat_priv->tt.last_changeset = NULL;
916 tt_change_len = batadv_tt_len(tt_diff_entries_count);
917 /* check whether this new OGM has no changes due to size problems */
918 if (tt_diff_entries_count > 0) {
919 /* if kmalloc() fails we will reply with the full table
920 * instead of providing the diff
922 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
923 if (bat_priv->tt.last_changeset) {
924 memcpy(bat_priv->tt.last_changeset,
925 tt_change, tt_change_len);
926 bat_priv->tt.last_changeset_len = tt_diff_len;
929 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
932 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
937 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
939 struct net_device *net_dev = (struct net_device *)seq->private;
940 struct batadv_priv *bat_priv = netdev_priv(net_dev);
941 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
942 struct batadv_tt_common_entry *tt_common_entry;
943 struct batadv_tt_local_entry *tt_local;
944 struct batadv_hard_iface *primary_if;
945 struct batadv_softif_vlan *vlan;
946 struct hlist_head *head;
951 unsigned long last_seen_jiffies;
953 u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
955 primary_if = batadv_seq_print_text_primary_if_get(seq);
960 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
961 net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
962 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
963 "Flags", "Last seen", "CRC");
965 for (i = 0; i < hash->size; i++) {
966 head = &hash->table[i];
969 hlist_for_each_entry_rcu(tt_common_entry,
971 tt_local = container_of(tt_common_entry,
972 struct batadv_tt_local_entry,
974 vid = tt_common_entry->vid;
975 last_seen_jiffies = jiffies - tt_local->last_seen;
976 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
977 last_seen_secs = last_seen_msecs / 1000;
978 last_seen_msecs = last_seen_msecs % 1000;
980 no_purge = tt_common_entry->flags & np_flag;
982 vlan = batadv_softif_vlan_get(bat_priv, vid);
984 seq_printf(seq, "Cannot retrieve VLAN %d\n",
985 BATADV_PRINT_VID(vid));
990 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
991 tt_common_entry->addr,
992 BATADV_PRINT_VID(tt_common_entry->vid),
993 ((tt_common_entry->flags &
994 BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
995 no_purge ? 'P' : '.',
996 ((tt_common_entry->flags &
997 BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
998 ((tt_common_entry->flags &
999 BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
1000 ((tt_common_entry->flags &
1001 BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1002 ((tt_common_entry->flags &
1003 BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1004 no_purge ? 0 : last_seen_secs,
1005 no_purge ? 0 : last_seen_msecs,
1008 batadv_softif_vlan_free_ref(vlan);
1014 batadv_hardif_free_ref(primary_if);
1019 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1020 struct batadv_tt_local_entry *tt_local_entry,
1021 u16 flags, const char *message)
1023 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1025 /* The local client has to be marked as "pending to be removed" but has
1026 * to be kept in the table in order to send it in a full table
1027 * response issued before the net ttvn increment (consistency check)
1029 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1031 batadv_dbg(BATADV_DBG_TT, bat_priv,
1032 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1033 tt_local_entry->common.addr,
1034 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1038 * batadv_tt_local_remove - logically remove an entry from the local table
1039 * @bat_priv: the bat priv with all the soft interface information
1040 * @addr: the MAC address of the client to remove
1041 * @vid: VLAN identifier
1042 * @message: message to append to the log on deletion
1043 * @roaming: true if the deletion is due to a roaming event
1045 * Returns the flags assigned to the local entry before being deleted
1047 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1048 unsigned short vid, const char *message,
1051 struct batadv_tt_local_entry *tt_local_entry;
1052 u16 flags, curr_flags = BATADV_NO_FLAGS;
1053 struct batadv_softif_vlan *vlan;
1054 void *tt_entry_exists;
1056 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1057 if (!tt_local_entry)
1060 curr_flags = tt_local_entry->common.flags;
1062 flags = BATADV_TT_CLIENT_DEL;
1063 /* if this global entry addition is due to a roaming, the node has to
1064 * mark the local entry as "roamed" in order to correctly reroute
1068 flags |= BATADV_TT_CLIENT_ROAM;
1069 /* mark the local client as ROAMed */
1070 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1073 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1074 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1078 /* if this client has been added right now, it is possible to
1079 * immediately purge it
1081 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1083 tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1086 &tt_local_entry->common);
1087 if (!tt_entry_exists)
1090 /* extra call to free the local tt entry */
1091 batadv_tt_local_entry_free_ref(tt_local_entry);
1093 /* decrease the reference held for this vlan */
1094 vlan = batadv_softif_vlan_get(bat_priv, vid);
1098 batadv_softif_vlan_free_ref(vlan);
1099 batadv_softif_vlan_free_ref(vlan);
1103 batadv_tt_local_entry_free_ref(tt_local_entry);
1109 * batadv_tt_local_purge_list - purge inactive tt local entries
1110 * @bat_priv: the bat priv with all the soft interface information
1111 * @head: pointer to the list containing the local tt entries
1112 * @timeout: parameter deciding whether a given tt local entry is considered
1115 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1116 struct hlist_head *head,
1119 struct batadv_tt_local_entry *tt_local_entry;
1120 struct batadv_tt_common_entry *tt_common_entry;
1121 struct hlist_node *node_tmp;
1123 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1125 tt_local_entry = container_of(tt_common_entry,
1126 struct batadv_tt_local_entry,
1128 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1131 /* entry already marked for deletion */
1132 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1135 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1138 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1139 BATADV_TT_CLIENT_DEL, "timed out");
1144 * batadv_tt_local_purge - purge inactive tt local entries
1145 * @bat_priv: the bat priv with all the soft interface information
1146 * @timeout: parameter deciding whether a given tt local entry is considered
1149 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1152 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1153 struct hlist_head *head;
1154 spinlock_t *list_lock; /* protects write access to the hash lists */
1157 for (i = 0; i < hash->size; i++) {
1158 head = &hash->table[i];
1159 list_lock = &hash->list_locks[i];
1161 spin_lock_bh(list_lock);
1162 batadv_tt_local_purge_list(bat_priv, head, timeout);
1163 spin_unlock_bh(list_lock);
1167 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1169 struct batadv_hashtable *hash;
1170 spinlock_t *list_lock; /* protects write access to the hash lists */
1171 struct batadv_tt_common_entry *tt_common_entry;
1172 struct batadv_tt_local_entry *tt_local;
1173 struct batadv_softif_vlan *vlan;
1174 struct hlist_node *node_tmp;
1175 struct hlist_head *head;
1178 if (!bat_priv->tt.local_hash)
1181 hash = bat_priv->tt.local_hash;
1183 for (i = 0; i < hash->size; i++) {
1184 head = &hash->table[i];
1185 list_lock = &hash->list_locks[i];
1187 spin_lock_bh(list_lock);
1188 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1190 hlist_del_rcu(&tt_common_entry->hash_entry);
1191 tt_local = container_of(tt_common_entry,
1192 struct batadv_tt_local_entry,
1195 /* decrease the reference held for this vlan */
1196 vlan = batadv_softif_vlan_get(bat_priv,
1197 tt_common_entry->vid);
1199 batadv_softif_vlan_free_ref(vlan);
1200 batadv_softif_vlan_free_ref(vlan);
1203 batadv_tt_local_entry_free_ref(tt_local);
1205 spin_unlock_bh(list_lock);
1208 batadv_hash_destroy(hash);
1210 bat_priv->tt.local_hash = NULL;
1213 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1215 if (bat_priv->tt.global_hash)
1218 bat_priv->tt.global_hash = batadv_hash_new(1024);
1220 if (!bat_priv->tt.global_hash)
1223 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1224 &batadv_tt_global_hash_lock_class_key);
1229 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1231 struct batadv_tt_change_node *entry, *safe;
1233 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1235 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1237 list_del(&entry->list);
1241 atomic_set(&bat_priv->tt.local_changes, 0);
1242 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1245 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1246 * batadv_tt_global_entry list
1248 * returns it with an increased refcounter, NULL if not found
1250 static struct batadv_tt_orig_list_entry *
1251 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1252 const struct batadv_orig_node *orig_node)
1254 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1255 const struct hlist_head *head;
1258 head = &entry->orig_list;
1259 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1260 if (tmp_orig_entry->orig_node != orig_node)
1262 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1265 orig_entry = tmp_orig_entry;
1273 /* find out if an orig_node is already in the list of a tt_global_entry.
1274 * returns true if found, false otherwise
1277 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1278 const struct batadv_orig_node *orig_node)
1280 struct batadv_tt_orig_list_entry *orig_entry;
1283 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1286 batadv_tt_orig_list_entry_free_ref(orig_entry);
1293 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1294 struct batadv_orig_node *orig_node, int ttvn)
1296 struct batadv_tt_orig_list_entry *orig_entry;
1298 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1300 /* refresh the ttvn: the current value could be a bogus one that
1301 * was added during a "temporary client detection"
1303 orig_entry->ttvn = ttvn;
1307 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1311 INIT_HLIST_NODE(&orig_entry->list);
1312 atomic_inc(&orig_node->refcount);
1313 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1314 orig_entry->orig_node = orig_node;
1315 orig_entry->ttvn = ttvn;
1316 atomic_set(&orig_entry->refcount, 2);
1318 spin_lock_bh(&tt_global->list_lock);
1319 hlist_add_head_rcu(&orig_entry->list,
1320 &tt_global->orig_list);
1321 spin_unlock_bh(&tt_global->list_lock);
1322 atomic_inc(&tt_global->orig_list_count);
1326 batadv_tt_orig_list_entry_free_ref(orig_entry);
1330 * batadv_tt_global_add - add a new TT global entry or update an existing one
1331 * @bat_priv: the bat priv with all the soft interface information
1332 * @orig_node: the originator announcing the client
1333 * @tt_addr: the mac address of the non-mesh client
1334 * @vid: VLAN identifier
1335 * @flags: TT flags that have to be set for this non-mesh client
1336 * @ttvn: the tt version number ever announcing this non-mesh client
1338 * Add a new TT global entry for the given originator. If the entry already
1339 * exists add a new reference to the given originator (a global entry can have
1340 * references to multiple originators) and adjust the flags attribute to reflect
1341 * the function argument.
1342 * If a TT local entry exists for this non-mesh client remove it.
1344 * The caller must hold orig_node refcount.
1346 * Return true if the new entry has been added, false otherwise
1348 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1349 struct batadv_orig_node *orig_node,
1350 const unsigned char *tt_addr,
1351 unsigned short vid, u16 flags, u8 ttvn)
1353 struct batadv_tt_global_entry *tt_global_entry;
1354 struct batadv_tt_local_entry *tt_local_entry;
1357 struct batadv_tt_common_entry *common;
1360 /* ignore global entries from backbone nodes */
1361 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1364 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1365 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1367 /* if the node already has a local client for this entry, it has to wait
1368 * for a roaming advertisement instead of manually messing up the global
1371 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1372 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1375 if (!tt_global_entry) {
1376 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1377 if (!tt_global_entry)
1380 common = &tt_global_entry->common;
1381 ether_addr_copy(common->addr, tt_addr);
1384 common->flags = flags;
1385 tt_global_entry->roam_at = 0;
1386 /* node must store current time in case of roaming. This is
1387 * needed to purge this entry out on timeout (if nobody claims
1390 if (flags & BATADV_TT_CLIENT_ROAM)
1391 tt_global_entry->roam_at = jiffies;
1392 atomic_set(&common->refcount, 2);
1393 common->added_at = jiffies;
1395 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1396 atomic_set(&tt_global_entry->orig_list_count, 0);
1397 spin_lock_init(&tt_global_entry->list_lock);
1399 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1401 batadv_choose_tt, common,
1402 &common->hash_entry);
1404 if (unlikely(hash_added != 0)) {
1405 /* remove the reference for the hash */
1406 batadv_tt_global_entry_free_ref(tt_global_entry);
1410 common = &tt_global_entry->common;
1411 /* If there is already a global entry, we can use this one for
1413 * But if we are trying to add a temporary client then here are
1414 * two options at this point:
1415 * 1) the global client is not a temporary client: the global
1416 * client has to be left as it is, temporary information
1417 * should never override any already known client state
1418 * 2) the global client is a temporary client: purge the
1419 * originator list and add the new one orig_entry
1421 if (flags & BATADV_TT_CLIENT_TEMP) {
1422 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1424 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1427 batadv_tt_global_del_orig_list(tt_global_entry);
1428 goto add_orig_entry;
1431 /* if the client was temporary added before receiving the first
1432 * OGM announcing it, we have to clear the TEMP flag. Also,
1433 * remove the previous temporary orig node and re-add it
1434 * if required. If the orig entry changed, the new one which
1435 * is a non-temporary entry is preferred.
1437 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1438 batadv_tt_global_del_orig_list(tt_global_entry);
1439 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1442 /* the change can carry possible "attribute" flags like the
1443 * TT_CLIENT_WIFI, therefore they have to be copied in the
1446 common->flags |= flags;
1448 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1449 * one originator left in the list and we previously received a
1450 * delete + roaming change for this originator.
1452 * We should first delete the old originator before adding the
1455 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1456 batadv_tt_global_del_orig_list(tt_global_entry);
1457 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1458 tt_global_entry->roam_at = 0;
1462 /* add the new orig_entry (if needed) or update it */
1463 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1465 batadv_dbg(BATADV_DBG_TT, bat_priv,
1466 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1467 common->addr, BATADV_PRINT_VID(common->vid),
1472 /* Do not remove multicast addresses from the local hash on
1475 if (is_multicast_ether_addr(tt_addr))
1478 /* remove address from local hash if present */
1479 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1480 "global tt received",
1481 flags & BATADV_TT_CLIENT_ROAM);
1482 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1484 if (!(flags & BATADV_TT_CLIENT_ROAM))
1485 /* this is a normal global add. Therefore the client is not in a
1486 * roaming state anymore.
1488 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1491 if (tt_global_entry)
1492 batadv_tt_global_entry_free_ref(tt_global_entry);
1494 batadv_tt_local_entry_free_ref(tt_local_entry);
1499 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1500 * @bat_priv: the bat priv with all the soft interface information
1501 * @tt_global_entry: global translation table entry to be analyzed
1503 * This functon assumes the caller holds rcu_read_lock().
1504 * Returns best originator list entry or NULL on errors.
1506 static struct batadv_tt_orig_list_entry *
1507 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1508 struct batadv_tt_global_entry *tt_global_entry)
1510 struct batadv_neigh_node *router, *best_router = NULL;
1511 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1512 struct hlist_head *head;
1513 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1515 head = &tt_global_entry->orig_list;
1516 hlist_for_each_entry_rcu(orig_entry, head, list) {
1517 router = batadv_orig_router_get(orig_entry->orig_node,
1523 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1524 best_router, BATADV_IF_DEFAULT) <= 0) {
1525 batadv_neigh_node_free_ref(router);
1529 /* release the refcount for the "old" best */
1531 batadv_neigh_node_free_ref(best_router);
1533 best_entry = orig_entry;
1534 best_router = router;
1538 batadv_neigh_node_free_ref(best_router);
1544 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1545 * for this global entry
1546 * @bat_priv: the bat priv with all the soft interface information
1547 * @tt_global_entry: global translation table entry to be printed
1548 * @seq: debugfs table seq_file struct
1550 * This functon assumes the caller holds rcu_read_lock().
1553 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1554 struct batadv_tt_global_entry *tt_global_entry,
1555 struct seq_file *seq)
1557 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1558 struct batadv_tt_common_entry *tt_common_entry;
1559 struct batadv_orig_node_vlan *vlan;
1560 struct hlist_head *head;
1564 tt_common_entry = &tt_global_entry->common;
1565 flags = tt_common_entry->flags;
1567 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1569 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1570 tt_common_entry->vid);
1573 " * Cannot retrieve VLAN %d for originator %pM\n",
1574 BATADV_PRINT_VID(tt_common_entry->vid),
1575 best_entry->orig_node->orig);
1579 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1581 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1582 '*', tt_global_entry->common.addr,
1583 BATADV_PRINT_VID(tt_global_entry->common.vid),
1584 best_entry->ttvn, best_entry->orig_node->orig,
1585 last_ttvn, vlan->tt.crc,
1586 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1587 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1588 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1589 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1591 batadv_orig_node_vlan_free_ref(vlan);
1595 head = &tt_global_entry->orig_list;
1597 hlist_for_each_entry_rcu(orig_entry, head, list) {
1598 if (best_entry == orig_entry)
1601 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1602 tt_common_entry->vid);
1605 " + Cannot retrieve VLAN %d for originator %pM\n",
1606 BATADV_PRINT_VID(tt_common_entry->vid),
1607 orig_entry->orig_node->orig);
1611 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1613 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1614 '+', tt_global_entry->common.addr,
1615 BATADV_PRINT_VID(tt_global_entry->common.vid),
1616 orig_entry->ttvn, orig_entry->orig_node->orig,
1617 last_ttvn, vlan->tt.crc,
1618 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1619 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1620 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1621 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1623 batadv_orig_node_vlan_free_ref(vlan);
1627 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1629 struct net_device *net_dev = (struct net_device *)seq->private;
1630 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1631 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1632 struct batadv_tt_common_entry *tt_common_entry;
1633 struct batadv_tt_global_entry *tt_global;
1634 struct batadv_hard_iface *primary_if;
1635 struct hlist_head *head;
1638 primary_if = batadv_seq_print_text_primary_if_get(seq);
1643 "Globally announced TT entries received via the mesh %s\n",
1645 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1646 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1649 for (i = 0; i < hash->size; i++) {
1650 head = &hash->table[i];
1653 hlist_for_each_entry_rcu(tt_common_entry,
1655 tt_global = container_of(tt_common_entry,
1656 struct batadv_tt_global_entry,
1658 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1664 batadv_hardif_free_ref(primary_if);
1669 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1670 * @tt_global_entry: the global entry to remove the orig_entry from
1671 * @orig_entry: the orig entry to remove and free
1673 * Remove an orig_entry from its list in the given tt_global_entry and
1674 * free this orig_entry afterwards.
1676 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1680 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1681 struct batadv_tt_orig_list_entry *orig_entry)
1683 lockdep_assert_held(&tt_global_entry->list_lock);
1685 batadv_tt_global_size_dec(orig_entry->orig_node,
1686 tt_global_entry->common.vid);
1687 atomic_dec(&tt_global_entry->orig_list_count);
1688 /* requires holding tt_global_entry->list_lock and orig_entry->list
1689 * being part of a list
1691 hlist_del_rcu(&orig_entry->list);
1692 batadv_tt_orig_list_entry_free_ref(orig_entry);
1695 /* deletes the orig list of a tt_global_entry */
1697 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1699 struct hlist_head *head;
1700 struct hlist_node *safe;
1701 struct batadv_tt_orig_list_entry *orig_entry;
1703 spin_lock_bh(&tt_global_entry->list_lock);
1704 head = &tt_global_entry->orig_list;
1705 hlist_for_each_entry_safe(orig_entry, safe, head, list)
1706 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1707 spin_unlock_bh(&tt_global_entry->list_lock);
1711 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1712 * @bat_priv: the bat priv with all the soft interface information
1713 * @tt_global_entry: the global entry to remove the orig_node from
1714 * @orig_node: the originator announcing the client
1715 * @message: message to append to the log on deletion
1717 * Remove the given orig_node and its according orig_entry from the given
1721 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1722 struct batadv_tt_global_entry *tt_global_entry,
1723 struct batadv_orig_node *orig_node,
1724 const char *message)
1726 struct hlist_head *head;
1727 struct hlist_node *safe;
1728 struct batadv_tt_orig_list_entry *orig_entry;
1731 spin_lock_bh(&tt_global_entry->list_lock);
1732 head = &tt_global_entry->orig_list;
1733 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1734 if (orig_entry->orig_node == orig_node) {
1735 vid = tt_global_entry->common.vid;
1736 batadv_dbg(BATADV_DBG_TT, bat_priv,
1737 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1739 tt_global_entry->common.addr,
1740 BATADV_PRINT_VID(vid), message);
1741 _batadv_tt_global_del_orig_entry(tt_global_entry,
1745 spin_unlock_bh(&tt_global_entry->list_lock);
1748 /* If the client is to be deleted, we check if it is the last origantor entry
1749 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1750 * timer, otherwise we simply remove the originator scheduled for deletion.
1753 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1754 struct batadv_tt_global_entry *tt_global_entry,
1755 struct batadv_orig_node *orig_node,
1756 const char *message)
1758 bool last_entry = true;
1759 struct hlist_head *head;
1760 struct batadv_tt_orig_list_entry *orig_entry;
1762 /* no local entry exists, case 1:
1763 * Check if this is the last one or if other entries exist.
1767 head = &tt_global_entry->orig_list;
1768 hlist_for_each_entry_rcu(orig_entry, head, list) {
1769 if (orig_entry->orig_node != orig_node) {
1777 /* its the last one, mark for roaming. */
1778 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1779 tt_global_entry->roam_at = jiffies;
1781 /* there is another entry, we can simply delete this
1782 * one and can still use the other one.
1784 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1785 orig_node, message);
1789 * batadv_tt_global_del - remove a client from the global table
1790 * @bat_priv: the bat priv with all the soft interface information
1791 * @orig_node: an originator serving this client
1792 * @addr: the mac address of the client
1793 * @vid: VLAN identifier
1794 * @message: a message explaining the reason for deleting the client to print
1795 * for debugging purpose
1796 * @roaming: true if the deletion has been triggered by a roaming event
1798 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1799 struct batadv_orig_node *orig_node,
1800 const unsigned char *addr, unsigned short vid,
1801 const char *message, bool roaming)
1803 struct batadv_tt_global_entry *tt_global_entry;
1804 struct batadv_tt_local_entry *local_entry = NULL;
1806 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1807 if (!tt_global_entry)
1811 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1812 orig_node, message);
1814 if (hlist_empty(&tt_global_entry->orig_list))
1815 batadv_tt_global_free(bat_priv, tt_global_entry,
1821 /* if we are deleting a global entry due to a roam
1822 * event, there are two possibilities:
1823 * 1) the client roamed from node A to node B => if there
1824 * is only one originator left for this client, we mark
1825 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1826 * wait for node B to claim it. In case of timeout
1827 * the entry is purged.
1829 * If there are other originators left, we directly delete
1831 * 2) the client roamed to us => we can directly delete
1832 * the global entry, since it is useless now.
1834 local_entry = batadv_tt_local_hash_find(bat_priv,
1835 tt_global_entry->common.addr,
1838 /* local entry exists, case 2: client roamed to us. */
1839 batadv_tt_global_del_orig_list(tt_global_entry);
1840 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1842 /* no local entry exists, case 1: check for roaming */
1843 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1844 orig_node, message);
1847 if (tt_global_entry)
1848 batadv_tt_global_entry_free_ref(tt_global_entry);
1850 batadv_tt_local_entry_free_ref(local_entry);
1854 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1855 * given originator matching the provided vid
1856 * @bat_priv: the bat priv with all the soft interface information
1857 * @orig_node: the originator owning the entries to remove
1858 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1860 * @message: debug message to print as "reason"
1862 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1863 struct batadv_orig_node *orig_node,
1865 const char *message)
1867 struct batadv_tt_global_entry *tt_global;
1868 struct batadv_tt_common_entry *tt_common_entry;
1870 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1871 struct hlist_node *safe;
1872 struct hlist_head *head;
1873 spinlock_t *list_lock; /* protects write access to the hash lists */
1879 for (i = 0; i < hash->size; i++) {
1880 head = &hash->table[i];
1881 list_lock = &hash->list_locks[i];
1883 spin_lock_bh(list_lock);
1884 hlist_for_each_entry_safe(tt_common_entry, safe,
1886 /* remove only matching entries */
1887 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1890 tt_global = container_of(tt_common_entry,
1891 struct batadv_tt_global_entry,
1894 batadv_tt_global_del_orig_node(bat_priv, tt_global,
1895 orig_node, message);
1897 if (hlist_empty(&tt_global->orig_list)) {
1898 vid = tt_global->common.vid;
1899 batadv_dbg(BATADV_DBG_TT, bat_priv,
1900 "Deleting global tt entry %pM (vid: %d): %s\n",
1901 tt_global->common.addr,
1902 BATADV_PRINT_VID(vid), message);
1903 hlist_del_rcu(&tt_common_entry->hash_entry);
1904 batadv_tt_global_entry_free_ref(tt_global);
1907 spin_unlock_bh(list_lock);
1909 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1912 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1916 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1917 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1919 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1920 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1922 *msg = "Roaming timeout\n";
1925 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1926 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1928 *msg = "Temporary client timeout\n";
1934 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1936 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1937 struct hlist_head *head;
1938 struct hlist_node *node_tmp;
1939 spinlock_t *list_lock; /* protects write access to the hash lists */
1942 struct batadv_tt_common_entry *tt_common;
1943 struct batadv_tt_global_entry *tt_global;
1945 for (i = 0; i < hash->size; i++) {
1946 head = &hash->table[i];
1947 list_lock = &hash->list_locks[i];
1949 spin_lock_bh(list_lock);
1950 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1952 tt_global = container_of(tt_common,
1953 struct batadv_tt_global_entry,
1956 if (!batadv_tt_global_to_purge(tt_global, &msg))
1959 batadv_dbg(BATADV_DBG_TT, bat_priv,
1960 "Deleting global tt entry %pM (vid: %d): %s\n",
1961 tt_global->common.addr,
1962 BATADV_PRINT_VID(tt_global->common.vid),
1965 hlist_del_rcu(&tt_common->hash_entry);
1967 batadv_tt_global_entry_free_ref(tt_global);
1969 spin_unlock_bh(list_lock);
1973 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1975 struct batadv_hashtable *hash;
1976 spinlock_t *list_lock; /* protects write access to the hash lists */
1977 struct batadv_tt_common_entry *tt_common_entry;
1978 struct batadv_tt_global_entry *tt_global;
1979 struct hlist_node *node_tmp;
1980 struct hlist_head *head;
1983 if (!bat_priv->tt.global_hash)
1986 hash = bat_priv->tt.global_hash;
1988 for (i = 0; i < hash->size; i++) {
1989 head = &hash->table[i];
1990 list_lock = &hash->list_locks[i];
1992 spin_lock_bh(list_lock);
1993 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1995 hlist_del_rcu(&tt_common_entry->hash_entry);
1996 tt_global = container_of(tt_common_entry,
1997 struct batadv_tt_global_entry,
1999 batadv_tt_global_entry_free_ref(tt_global);
2001 spin_unlock_bh(list_lock);
2004 batadv_hash_destroy(hash);
2006 bat_priv->tt.global_hash = NULL;
2010 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2011 struct batadv_tt_global_entry *tt_global_entry)
2015 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2016 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2019 /* check if the two clients are marked as isolated */
2020 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2021 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2028 * batadv_transtable_search - get the mesh destination for a given client
2029 * @bat_priv: the bat priv with all the soft interface information
2030 * @src: mac address of the source client
2031 * @addr: mac address of the destination client
2032 * @vid: VLAN identifier
2034 * Returns a pointer to the originator that was selected as destination in the
2035 * mesh for contacting the client 'addr', NULL otherwise.
2036 * In case of multiple originators serving the same client, the function returns
2037 * the best one (best in terms of metric towards the destination node).
2039 * If the two clients are AP isolated the function returns NULL.
2041 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2046 struct batadv_tt_local_entry *tt_local_entry = NULL;
2047 struct batadv_tt_global_entry *tt_global_entry = NULL;
2048 struct batadv_orig_node *orig_node = NULL;
2049 struct batadv_tt_orig_list_entry *best_entry;
2051 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2052 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2053 if (!tt_local_entry ||
2054 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2058 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2059 if (!tt_global_entry)
2062 /* check whether the clients should not communicate due to AP
2065 if (tt_local_entry &&
2066 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2070 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2071 /* found anything? */
2073 orig_node = best_entry->orig_node;
2074 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2079 if (tt_global_entry)
2080 batadv_tt_global_entry_free_ref(tt_global_entry);
2082 batadv_tt_local_entry_free_ref(tt_local_entry);
2088 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2089 * to the given orig_node
2090 * @bat_priv: the bat priv with all the soft interface information
2091 * @orig_node: originator for which the CRC should be computed
2092 * @vid: VLAN identifier for which the CRC32 has to be computed
2094 * This function computes the checksum for the global table corresponding to a
2095 * specific originator. In particular, the checksum is computed as follows: For
2096 * each client connected to the originator the CRC32C of the MAC address and the
2097 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2100 * The idea behind is that CRC32C should be used as much as possible in order to
2101 * produce a unique hash of the table, but since the order which is used to feed
2102 * the CRC32C function affects the result and since every node in the network
2103 * probably sorts the clients differently, the hash function cannot be directly
2104 * computed over the entire table. Hence the CRC32C is used only on
2105 * the single client entry, while all the results are then xor'ed together
2106 * because the XOR operation can combine them all while trying to reduce the
2107 * noise as much as possible.
2109 * Returns the checksum of the global table of a given originator.
2111 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2112 struct batadv_orig_node *orig_node,
2115 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2116 struct batadv_tt_common_entry *tt_common;
2117 struct batadv_tt_global_entry *tt_global;
2118 struct hlist_head *head;
2119 u32 i, crc_tmp, crc = 0;
2123 for (i = 0; i < hash->size; i++) {
2124 head = &hash->table[i];
2127 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2128 tt_global = container_of(tt_common,
2129 struct batadv_tt_global_entry,
2131 /* compute the CRC only for entries belonging to the
2132 * VLAN identified by the vid passed as parameter
2134 if (tt_common->vid != vid)
2137 /* Roaming clients are in the global table for
2138 * consistency only. They don't have to be
2139 * taken into account while computing the
2142 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2144 /* Temporary clients have not been announced yet, so
2145 * they have to be skipped while computing the global
2148 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2151 /* find out if this global entry is announced by this
2154 if (!batadv_tt_global_entry_has_orig(tt_global,
2158 /* use network order to read the VID: this ensures that
2159 * every node reads the bytes in the same order.
2161 tmp_vid = htons(tt_common->vid);
2162 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2164 /* compute the CRC on flags that have to be kept in sync
2167 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2168 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2170 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2179 * batadv_tt_local_crc - calculates the checksum of the local table
2180 * @bat_priv: the bat priv with all the soft interface information
2181 * @vid: VLAN identifier for which the CRC32 has to be computed
2183 * For details about the computation, please refer to the documentation for
2184 * batadv_tt_global_crc().
2186 * Returns the checksum of the local table
2188 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2191 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2192 struct batadv_tt_common_entry *tt_common;
2193 struct hlist_head *head;
2194 u32 i, crc_tmp, crc = 0;
2198 for (i = 0; i < hash->size; i++) {
2199 head = &hash->table[i];
2202 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2203 /* compute the CRC only for entries belonging to the
2204 * VLAN identified by vid
2206 if (tt_common->vid != vid)
2209 /* not yet committed clients have not to be taken into
2210 * account while computing the CRC
2212 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2215 /* use network order to read the VID: this ensures that
2216 * every node reads the bytes in the same order.
2218 tmp_vid = htons(tt_common->vid);
2219 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2221 /* compute the CRC on flags that have to be kept in sync
2224 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2225 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2227 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2235 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2237 struct batadv_tt_req_node *node;
2238 struct hlist_node *safe;
2240 spin_lock_bh(&bat_priv->tt.req_list_lock);
2242 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2243 hlist_del_init(&node->list);
2247 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2250 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2251 struct batadv_orig_node *orig_node,
2252 const void *tt_buff,
2255 /* Replace the old buffer only if I received something in the
2256 * last OGM (the OGM could carry no changes)
2258 spin_lock_bh(&orig_node->tt_buff_lock);
2259 if (tt_buff_len > 0) {
2260 kfree(orig_node->tt_buff);
2261 orig_node->tt_buff_len = 0;
2262 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2263 if (orig_node->tt_buff) {
2264 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2265 orig_node->tt_buff_len = tt_buff_len;
2268 spin_unlock_bh(&orig_node->tt_buff_lock);
2271 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2273 struct batadv_tt_req_node *node;
2274 struct hlist_node *safe;
2276 spin_lock_bh(&bat_priv->tt.req_list_lock);
2277 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2278 if (batadv_has_timed_out(node->issued_at,
2279 BATADV_TT_REQUEST_TIMEOUT)) {
2280 hlist_del_init(&node->list);
2284 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2288 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2289 * @bat_priv: the bat priv with all the soft interface information
2290 * @orig_node: orig node this request is being issued for
2292 * Returns the pointer to the new tt_req_node struct if no request
2293 * has already been issued for this orig_node, NULL otherwise.
2295 static struct batadv_tt_req_node *
2296 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2297 struct batadv_orig_node *orig_node)
2299 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2301 spin_lock_bh(&bat_priv->tt.req_list_lock);
2302 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2303 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2304 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2305 BATADV_TT_REQUEST_TIMEOUT))
2309 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2313 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2314 tt_req_node->issued_at = jiffies;
2316 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2318 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2323 * batadv_tt_local_valid - verify that given tt entry is a valid one
2324 * @entry_ptr: to be checked local tt entry
2325 * @data_ptr: not used but definition required to satisfy the callback prototype
2327 * Returns 1 if the entry is a valid, 0 otherwise.
2329 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2331 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2333 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2338 static int batadv_tt_global_valid(const void *entry_ptr,
2339 const void *data_ptr)
2341 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2342 const struct batadv_tt_global_entry *tt_global_entry;
2343 const struct batadv_orig_node *orig_node = data_ptr;
2345 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2346 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2349 tt_global_entry = container_of(tt_common_entry,
2350 struct batadv_tt_global_entry,
2353 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2357 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2359 * @bat_priv: the bat priv with all the soft interface information
2360 * @hash: hash table containing the tt entries
2361 * @tt_len: expected tvlv tt data buffer length in number of bytes
2362 * @tvlv_buff: pointer to the buffer to fill with the TT data
2363 * @valid_cb: function to filter tt change entries
2364 * @cb_data: data passed to the filter function as argument
2366 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2367 struct batadv_hashtable *hash,
2368 void *tvlv_buff, u16 tt_len,
2369 int (*valid_cb)(const void *, const void *),
2372 struct batadv_tt_common_entry *tt_common_entry;
2373 struct batadv_tvlv_tt_change *tt_change;
2374 struct hlist_head *head;
2375 u16 tt_tot, tt_num_entries = 0;
2378 tt_tot = batadv_tt_entries(tt_len);
2379 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2382 for (i = 0; i < hash->size; i++) {
2383 head = &hash->table[i];
2385 hlist_for_each_entry_rcu(tt_common_entry,
2387 if (tt_tot == tt_num_entries)
2390 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2393 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2394 tt_change->flags = tt_common_entry->flags;
2395 tt_change->vid = htons(tt_common_entry->vid);
2396 memset(tt_change->reserved, 0,
2397 sizeof(tt_change->reserved));
2407 * batadv_tt_global_check_crc - check if all the CRCs are correct
2408 * @orig_node: originator for which the CRCs have to be checked
2409 * @tt_vlan: pointer to the first tvlv VLAN entry
2410 * @num_vlan: number of tvlv VLAN entries
2411 * @create: if true, create VLAN objects if not found
2413 * Return true if all the received CRCs match the locally stored ones, false
2416 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2417 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2420 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2421 struct batadv_orig_node_vlan *vlan;
2422 int i, orig_num_vlan;
2425 /* check if each received CRC matches the locally stored one */
2426 for (i = 0; i < num_vlan; i++) {
2427 tt_vlan_tmp = tt_vlan + i;
2429 /* if orig_node is a backbone node for this VLAN, don't check
2430 * the CRC as we ignore all the global entries over it
2432 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2434 ntohs(tt_vlan_tmp->vid)))
2437 vlan = batadv_orig_node_vlan_get(orig_node,
2438 ntohs(tt_vlan_tmp->vid));
2443 batadv_orig_node_vlan_free_ref(vlan);
2445 if (crc != ntohl(tt_vlan_tmp->crc))
2449 /* check if any excess VLANs exist locally for the originator
2450 * which are not mentioned in the TVLV from the originator.
2454 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2458 if (orig_num_vlan > num_vlan)
2465 * batadv_tt_local_update_crc - update all the local CRCs
2466 * @bat_priv: the bat priv with all the soft interface information
2468 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2470 struct batadv_softif_vlan *vlan;
2472 /* recompute the global CRC for each VLAN */
2474 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2475 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2481 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2482 * @bat_priv: the bat priv with all the soft interface information
2483 * @orig_node: the orig_node for which the CRCs have to be updated
2485 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2486 struct batadv_orig_node *orig_node)
2488 struct batadv_orig_node_vlan *vlan;
2491 /* recompute the global CRC for each VLAN */
2493 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2494 /* if orig_node is a backbone node for this VLAN, don't compute
2495 * the CRC as we ignore all the global entries over it
2497 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2501 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2508 * batadv_send_tt_request - send a TT Request message to a given node
2509 * @bat_priv: the bat priv with all the soft interface information
2510 * @dst_orig_node: the destination of the message
2511 * @ttvn: the version number that the source of the message is looking for
2512 * @tt_vlan: pointer to the first tvlv VLAN object to request
2513 * @num_vlan: number of tvlv VLAN entries
2514 * @full_table: ask for the entire translation table if true, while only for the
2515 * last TT diff otherwise
2517 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2518 struct batadv_orig_node *dst_orig_node,
2520 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2521 u16 num_vlan, bool full_table)
2523 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2524 struct batadv_tt_req_node *tt_req_node = NULL;
2525 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2526 struct batadv_hard_iface *primary_if;
2530 primary_if = batadv_primary_if_get_selected(bat_priv);
2534 /* The new tt_req will be issued only if I'm not waiting for a
2535 * reply from the same orig_node yet
2537 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2541 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2542 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2546 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2547 tvlv_tt_data->ttvn = ttvn;
2548 tvlv_tt_data->num_vlan = htons(num_vlan);
2550 /* send all the CRCs within the request. This is needed by intermediate
2551 * nodes to ensure they have the correct table before replying
2553 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2554 for (i = 0; i < num_vlan; i++) {
2555 tt_vlan_req->vid = tt_vlan->vid;
2556 tt_vlan_req->crc = tt_vlan->crc;
2563 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2565 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2566 dst_orig_node->orig, full_table ? 'F' : '.');
2568 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2569 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2570 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2571 tvlv_tt_data, size);
2576 batadv_hardif_free_ref(primary_if);
2577 if (ret && tt_req_node) {
2578 spin_lock_bh(&bat_priv->tt.req_list_lock);
2579 /* hlist_del_init() verifies tt_req_node still is in the list */
2580 hlist_del_init(&tt_req_node->list);
2581 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2584 kfree(tvlv_tt_data);
2589 * batadv_send_other_tt_response - send reply to tt request concerning another
2590 * node's translation table
2591 * @bat_priv: the bat priv with all the soft interface information
2592 * @tt_data: tt data containing the tt request information
2593 * @req_src: mac address of tt request sender
2594 * @req_dst: mac address of tt request recipient
2596 * Returns true if tt request reply was sent, false otherwise.
2598 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2599 struct batadv_tvlv_tt_data *tt_data,
2600 u8 *req_src, u8 *req_dst)
2602 struct batadv_orig_node *req_dst_orig_node;
2603 struct batadv_orig_node *res_dst_orig_node = NULL;
2604 struct batadv_tvlv_tt_change *tt_change;
2605 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2606 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2607 bool ret = false, full_table;
2608 u8 orig_ttvn, req_ttvn;
2612 batadv_dbg(BATADV_DBG_TT, bat_priv,
2613 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2614 req_src, tt_data->ttvn, req_dst,
2615 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2617 /* Let's get the orig node of the REAL destination */
2618 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2619 if (!req_dst_orig_node)
2622 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2623 if (!res_dst_orig_node)
2626 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2627 req_ttvn = tt_data->ttvn;
2629 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2630 /* this node doesn't have the requested data */
2631 if (orig_ttvn != req_ttvn ||
2632 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2633 ntohs(tt_data->num_vlan)))
2636 /* If the full table has been explicitly requested */
2637 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2638 !req_dst_orig_node->tt_buff)
2643 /* TT fragmentation hasn't been implemented yet, so send as many
2644 * TT entries fit a single packet as possible only
2647 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2648 tt_len = req_dst_orig_node->tt_buff_len;
2650 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2657 /* Copy the last orig_node's OGM buffer */
2658 memcpy(tt_change, req_dst_orig_node->tt_buff,
2659 req_dst_orig_node->tt_buff_len);
2660 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2662 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2663 * in the initial part
2666 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2673 /* fill the rest of the tvlv with the real TT entries */
2674 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2676 batadv_tt_global_valid,
2680 /* Don't send the response, if larger than fragmented packet. */
2681 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2682 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2683 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2684 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2685 res_dst_orig_node->orig);
2689 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2690 tvlv_tt_data->ttvn = req_ttvn;
2693 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2695 batadv_dbg(BATADV_DBG_TT, bat_priv,
2696 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2697 res_dst_orig_node->orig, req_dst_orig_node->orig,
2698 full_table ? 'F' : '.', req_ttvn);
2700 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2702 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2703 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2710 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2713 if (res_dst_orig_node)
2714 batadv_orig_node_free_ref(res_dst_orig_node);
2715 if (req_dst_orig_node)
2716 batadv_orig_node_free_ref(req_dst_orig_node);
2717 kfree(tvlv_tt_data);
2722 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2724 * @bat_priv: the bat priv with all the soft interface information
2725 * @tt_data: tt data containing the tt request information
2726 * @req_src: mac address of tt request sender
2728 * Returns true if tt request reply was sent, false otherwise.
2730 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2731 struct batadv_tvlv_tt_data *tt_data,
2734 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2735 struct batadv_hard_iface *primary_if = NULL;
2736 struct batadv_tvlv_tt_change *tt_change;
2737 struct batadv_orig_node *orig_node;
2738 u8 my_ttvn, req_ttvn;
2743 batadv_dbg(BATADV_DBG_TT, bat_priv,
2744 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2745 req_src, tt_data->ttvn,
2746 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2748 spin_lock_bh(&bat_priv->tt.commit_lock);
2750 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2751 req_ttvn = tt_data->ttvn;
2753 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2757 primary_if = batadv_primary_if_get_selected(bat_priv);
2761 /* If the full table has been explicitly requested or the gap
2762 * is too big send the whole local translation table
2764 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2765 !bat_priv->tt.last_changeset)
2770 /* TT fragmentation hasn't been implemented yet, so send as many
2771 * TT entries fit a single packet as possible only
2774 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2776 tt_len = bat_priv->tt.last_changeset_len;
2777 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2784 /* Copy the last orig_node's OGM buffer */
2785 memcpy(tt_change, bat_priv->tt.last_changeset,
2786 bat_priv->tt.last_changeset_len);
2787 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2789 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2791 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2792 * in the initial part
2795 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2802 /* fill the rest of the tvlv with the real TT entries */
2803 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2805 batadv_tt_local_valid, NULL);
2808 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2809 tvlv_tt_data->ttvn = req_ttvn;
2812 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2814 batadv_dbg(BATADV_DBG_TT, bat_priv,
2815 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2816 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2818 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2820 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2821 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2827 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2829 spin_unlock_bh(&bat_priv->tt.commit_lock);
2831 batadv_orig_node_free_ref(orig_node);
2833 batadv_hardif_free_ref(primary_if);
2834 kfree(tvlv_tt_data);
2835 /* The packet was for this host, so it doesn't need to be re-routed */
2840 * batadv_send_tt_response - send reply to tt request
2841 * @bat_priv: the bat priv with all the soft interface information
2842 * @tt_data: tt data containing the tt request information
2843 * @req_src: mac address of tt request sender
2844 * @req_dst: mac address of tt request recipient
2846 * Returns true if tt request reply was sent, false otherwise.
2848 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2849 struct batadv_tvlv_tt_data *tt_data,
2850 u8 *req_src, u8 *req_dst)
2852 if (batadv_is_my_mac(bat_priv, req_dst))
2853 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2854 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2858 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2859 struct batadv_orig_node *orig_node,
2860 struct batadv_tvlv_tt_change *tt_change,
2861 u16 tt_num_changes, u8 ttvn)
2866 for (i = 0; i < tt_num_changes; i++) {
2867 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2868 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2869 batadv_tt_global_del(bat_priv, orig_node,
2870 (tt_change + i)->addr,
2871 ntohs((tt_change + i)->vid),
2872 "tt removed by changes",
2875 if (!batadv_tt_global_add(bat_priv, orig_node,
2876 (tt_change + i)->addr,
2877 ntohs((tt_change + i)->vid),
2878 (tt_change + i)->flags, ttvn))
2879 /* In case of problem while storing a
2880 * global_entry, we stop the updating
2881 * procedure without committing the
2882 * ttvn change. This will avoid to send
2883 * corrupted data on tt_request
2888 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2891 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2892 struct batadv_tvlv_tt_change *tt_change,
2893 u8 ttvn, u8 *resp_src,
2896 struct batadv_orig_node *orig_node;
2898 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2902 /* Purge the old table first.. */
2903 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2904 "Received full table");
2906 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2909 spin_lock_bh(&orig_node->tt_buff_lock);
2910 kfree(orig_node->tt_buff);
2911 orig_node->tt_buff_len = 0;
2912 orig_node->tt_buff = NULL;
2913 spin_unlock_bh(&orig_node->tt_buff_lock);
2915 atomic_set(&orig_node->last_ttvn, ttvn);
2919 batadv_orig_node_free_ref(orig_node);
2922 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2923 struct batadv_orig_node *orig_node,
2924 u16 tt_num_changes, u8 ttvn,
2925 struct batadv_tvlv_tt_change *tt_change)
2927 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2928 tt_num_changes, ttvn);
2930 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2931 batadv_tt_len(tt_num_changes));
2932 atomic_set(&orig_node->last_ttvn, ttvn);
2936 * batadv_is_my_client - check if a client is served by the local node
2937 * @bat_priv: the bat priv with all the soft interface information
2938 * @addr: the mac address of the client to check
2939 * @vid: VLAN identifier
2941 * Returns true if the client is served by this node, false otherwise.
2943 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2946 struct batadv_tt_local_entry *tt_local_entry;
2949 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2950 if (!tt_local_entry)
2952 /* Check if the client has been logically deleted (but is kept for
2953 * consistency purpose)
2955 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2956 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2961 batadv_tt_local_entry_free_ref(tt_local_entry);
2966 * batadv_handle_tt_response - process incoming tt reply
2967 * @bat_priv: the bat priv with all the soft interface information
2968 * @tt_data: tt data containing the tt request information
2969 * @resp_src: mac address of tt reply sender
2970 * @num_entries: number of tt change entries appended to the tt data
2972 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2973 struct batadv_tvlv_tt_data *tt_data,
2974 u8 *resp_src, u16 num_entries)
2976 struct batadv_tt_req_node *node;
2977 struct hlist_node *safe;
2978 struct batadv_orig_node *orig_node = NULL;
2979 struct batadv_tvlv_tt_change *tt_change;
2980 u8 *tvlv_ptr = (u8 *)tt_data;
2983 batadv_dbg(BATADV_DBG_TT, bat_priv,
2984 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2985 resp_src, tt_data->ttvn, num_entries,
2986 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2988 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2992 spin_lock_bh(&orig_node->tt_lock);
2994 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2995 change_offset *= ntohs(tt_data->num_vlan);
2996 change_offset += sizeof(*tt_data);
2997 tvlv_ptr += change_offset;
2999 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
3000 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
3001 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3002 resp_src, num_entries);
3004 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3005 tt_data->ttvn, tt_change);
3008 /* Recalculate the CRC for this orig_node and store it */
3009 batadv_tt_global_update_crc(bat_priv, orig_node);
3011 spin_unlock_bh(&orig_node->tt_lock);
3013 /* Delete the tt_req_node from pending tt_requests list */
3014 spin_lock_bh(&bat_priv->tt.req_list_lock);
3015 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3016 if (!batadv_compare_eth(node->addr, resp_src))
3018 hlist_del_init(&node->list);
3022 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3025 batadv_orig_node_free_ref(orig_node);
3028 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3030 struct batadv_tt_roam_node *node, *safe;
3032 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3034 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3035 list_del(&node->list);
3039 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3042 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3044 struct batadv_tt_roam_node *node, *safe;
3046 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3047 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3048 if (!batadv_has_timed_out(node->first_time,
3049 BATADV_ROAMING_MAX_TIME))
3052 list_del(&node->list);
3055 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3058 /* This function checks whether the client already reached the
3059 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3062 * returns true if the ROAMING_ADV can be sent, false otherwise
3064 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3066 struct batadv_tt_roam_node *tt_roam_node;
3069 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3070 /* The new tt_req will be issued only if I'm not waiting for a
3071 * reply from the same orig_node yet
3073 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3074 if (!batadv_compare_eth(tt_roam_node->addr, client))
3077 if (batadv_has_timed_out(tt_roam_node->first_time,
3078 BATADV_ROAMING_MAX_TIME))
3081 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3082 /* Sorry, you roamed too many times! */
3089 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3093 tt_roam_node->first_time = jiffies;
3094 atomic_set(&tt_roam_node->counter,
3095 BATADV_ROAMING_MAX_COUNT - 1);
3096 ether_addr_copy(tt_roam_node->addr, client);
3098 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3103 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3108 * batadv_send_roam_adv - send a roaming advertisement message
3109 * @bat_priv: the bat priv with all the soft interface information
3110 * @client: mac address of the roaming client
3111 * @vid: VLAN identifier
3112 * @orig_node: message destination
3114 * Send a ROAMING_ADV message to the node which was previously serving this
3115 * client. This is done to inform the node that from now on all traffic destined
3116 * for this particular roamed client has to be forwarded to the sender of the
3119 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3121 struct batadv_orig_node *orig_node)
3123 struct batadv_hard_iface *primary_if;
3124 struct batadv_tvlv_roam_adv tvlv_roam;
3126 primary_if = batadv_primary_if_get_selected(bat_priv);
3130 /* before going on we have to check whether the client has
3131 * already roamed to us too many times
3133 if (!batadv_tt_check_roam_count(bat_priv, client))
3136 batadv_dbg(BATADV_DBG_TT, bat_priv,
3137 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3138 orig_node->orig, client, BATADV_PRINT_VID(vid));
3140 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3142 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3143 tvlv_roam.vid = htons(vid);
3145 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3146 orig_node->orig, BATADV_TVLV_ROAM, 1,
3147 &tvlv_roam, sizeof(tvlv_roam));
3151 batadv_hardif_free_ref(primary_if);
3154 static void batadv_tt_purge(struct work_struct *work)
3156 struct delayed_work *delayed_work;
3157 struct batadv_priv_tt *priv_tt;
3158 struct batadv_priv *bat_priv;
3160 delayed_work = container_of(work, struct delayed_work, work);
3161 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3162 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3164 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3165 batadv_tt_global_purge(bat_priv);
3166 batadv_tt_req_purge(bat_priv);
3167 batadv_tt_roam_purge(bat_priv);
3169 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3170 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3173 void batadv_tt_free(struct batadv_priv *bat_priv)
3175 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3176 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3178 cancel_delayed_work_sync(&bat_priv->tt.work);
3180 batadv_tt_local_table_free(bat_priv);
3181 batadv_tt_global_table_free(bat_priv);
3182 batadv_tt_req_list_free(bat_priv);
3183 batadv_tt_changes_list_free(bat_priv);
3184 batadv_tt_roam_list_free(bat_priv);
3186 kfree(bat_priv->tt.last_changeset);
3190 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3191 * table and possibly count them in the TT size
3192 * @bat_priv: the bat priv with all the soft interface information
3193 * @flags: the flag to switch
3194 * @enable: whether to set or unset the flag
3195 * @count: whether to increase the TT size by the number of changed entries
3197 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3198 bool enable, bool count)
3200 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3201 struct batadv_tt_common_entry *tt_common_entry;
3202 u16 changed_num = 0;
3203 struct hlist_head *head;
3209 for (i = 0; i < hash->size; i++) {
3210 head = &hash->table[i];
3213 hlist_for_each_entry_rcu(tt_common_entry,
3216 if ((tt_common_entry->flags & flags) == flags)
3218 tt_common_entry->flags |= flags;
3220 if (!(tt_common_entry->flags & flags))
3222 tt_common_entry->flags &= ~flags;
3229 batadv_tt_local_size_inc(bat_priv,
3230 tt_common_entry->vid);
3236 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3237 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3239 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3240 struct batadv_tt_common_entry *tt_common;
3241 struct batadv_tt_local_entry *tt_local;
3242 struct batadv_softif_vlan *vlan;
3243 struct hlist_node *node_tmp;
3244 struct hlist_head *head;
3245 spinlock_t *list_lock; /* protects write access to the hash lists */
3251 for (i = 0; i < hash->size; i++) {
3252 head = &hash->table[i];
3253 list_lock = &hash->list_locks[i];
3255 spin_lock_bh(list_lock);
3256 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3258 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3261 batadv_dbg(BATADV_DBG_TT, bat_priv,
3262 "Deleting local tt entry (%pM, vid: %d): pending\n",
3264 BATADV_PRINT_VID(tt_common->vid));
3266 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3267 hlist_del_rcu(&tt_common->hash_entry);
3268 tt_local = container_of(tt_common,
3269 struct batadv_tt_local_entry,
3272 /* decrease the reference held for this vlan */
3273 vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3275 batadv_softif_vlan_free_ref(vlan);
3276 batadv_softif_vlan_free_ref(vlan);
3279 batadv_tt_local_entry_free_ref(tt_local);
3281 spin_unlock_bh(list_lock);
3286 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3287 * which have been queued in the time since the last commit
3288 * @bat_priv: the bat priv with all the soft interface information
3290 * Caller must hold tt->commit_lock.
3292 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3294 lockdep_assert_held(&bat_priv->tt.commit_lock);
3296 /* Update multicast addresses in local translation table */
3297 batadv_mcast_mla_update(bat_priv);
3299 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3300 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3301 batadv_tt_tvlv_container_update(bat_priv);
3305 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3307 batadv_tt_local_purge_pending_clients(bat_priv);
3308 batadv_tt_local_update_crc(bat_priv);
3310 /* Increment the TTVN only once per OGM interval */
3311 atomic_inc(&bat_priv->tt.vn);
3312 batadv_dbg(BATADV_DBG_TT, bat_priv,
3313 "Local changes committed, updating to ttvn %u\n",
3314 (u8)atomic_read(&bat_priv->tt.vn));
3316 /* reset the sending counter */
3317 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3318 batadv_tt_tvlv_container_update(bat_priv);
3322 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3323 * have been queued in the time since the last commit
3324 * @bat_priv: the bat priv with all the soft interface information
3326 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3328 spin_lock_bh(&bat_priv->tt.commit_lock);
3329 batadv_tt_local_commit_changes_nolock(bat_priv);
3330 spin_unlock_bh(&bat_priv->tt.commit_lock);
3333 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3336 struct batadv_tt_local_entry *tt_local_entry = NULL;
3337 struct batadv_tt_global_entry *tt_global_entry = NULL;
3338 struct batadv_softif_vlan *vlan;
3341 vlan = batadv_softif_vlan_get(bat_priv, vid);
3345 if (!atomic_read(&vlan->ap_isolation))
3348 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3349 if (!tt_local_entry)
3352 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3353 if (!tt_global_entry)
3356 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3362 batadv_softif_vlan_free_ref(vlan);
3363 if (tt_global_entry)
3364 batadv_tt_global_entry_free_ref(tt_global_entry);
3366 batadv_tt_local_entry_free_ref(tt_local_entry);
3371 * batadv_tt_update_orig - update global translation table with new tt
3372 * information received via ogms
3373 * @bat_priv: the bat priv with all the soft interface information
3374 * @orig: the orig_node of the ogm
3375 * @tt_vlan: pointer to the first tvlv VLAN entry
3376 * @tt_num_vlan: number of tvlv VLAN entries
3377 * @tt_change: pointer to the first entry in the TT buffer
3378 * @tt_num_changes: number of tt changes inside the tt buffer
3379 * @ttvn: translation table version number of this changeset
3380 * @tt_crc: crc32 checksum of orig node's translation table
3382 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3383 struct batadv_orig_node *orig_node,
3384 const void *tt_buff, u16 tt_num_vlan,
3385 struct batadv_tvlv_tt_change *tt_change,
3386 u16 tt_num_changes, u8 ttvn)
3388 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3389 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3390 bool full_table = true;
3393 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3394 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3395 &orig_node->capa_initialized);
3397 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3398 * increased by one -> we can apply the attached changes
3400 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3401 /* the OGM could not contain the changes due to their size or
3402 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3404 * In this case send a tt request
3406 if (!tt_num_changes) {
3411 spin_lock_bh(&orig_node->tt_lock);
3413 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3416 /* Even if we received the precomputed crc with the OGM, we
3417 * prefer to recompute it to spot any possible inconsistency
3418 * in the global table
3420 batadv_tt_global_update_crc(bat_priv, orig_node);
3422 spin_unlock_bh(&orig_node->tt_lock);
3424 /* The ttvn alone is not enough to guarantee consistency
3425 * because a single value could represent different states
3426 * (due to the wrap around). Thus a node has to check whether
3427 * the resulting table (after applying the changes) is still
3428 * consistent or not. E.g. a node could disconnect while its
3429 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3430 * checking the CRC value is mandatory to detect the
3433 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3437 /* if we missed more than one change or our tables are not
3438 * in sync anymore -> request fresh tt data
3440 if (!has_tt_init || ttvn != orig_ttvn ||
3441 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3444 batadv_dbg(BATADV_DBG_TT, bat_priv,
3445 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3446 orig_node->orig, ttvn, orig_ttvn,
3448 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3449 tt_vlan, tt_num_vlan,
3457 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3458 * @bat_priv: the bat priv with all the soft interface information
3459 * @addr: the mac address of the client to check
3460 * @vid: VLAN identifier
3462 * Returns true if we know that the client has moved from its old originator
3463 * to another one. This entry is still kept for consistency purposes and will be
3464 * deleted later by a DEL or because of timeout
3466 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3467 u8 *addr, unsigned short vid)
3469 struct batadv_tt_global_entry *tt_global_entry;
3472 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3473 if (!tt_global_entry)
3476 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3477 batadv_tt_global_entry_free_ref(tt_global_entry);
3483 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3484 * @bat_priv: the bat priv with all the soft interface information
3485 * @addr: the mac address of the local client to query
3486 * @vid: VLAN identifier
3488 * Returns true if the local client is known to be roaming (it is not served by
3489 * this node anymore) or not. If yes, the client is still present in the table
3490 * to keep the latter consistent with the node TTVN
3492 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3493 u8 *addr, unsigned short vid)
3495 struct batadv_tt_local_entry *tt_local_entry;
3498 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3499 if (!tt_local_entry)
3502 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3503 batadv_tt_local_entry_free_ref(tt_local_entry);
3508 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3509 struct batadv_orig_node *orig_node,
3510 const unsigned char *addr,
3515 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3516 BATADV_TT_CLIENT_TEMP,
3517 atomic_read(&orig_node->last_ttvn)))
3520 batadv_dbg(BATADV_DBG_TT, bat_priv,
3521 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3522 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3529 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3530 * maximum packet size that can be transported through the mesh
3531 * @soft_iface: netdev struct of the mesh interface
3533 * Remove entries older than 'timeout' and half timeout if more entries need
3536 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3538 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3539 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3540 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3541 bool reduced = false;
3543 spin_lock_bh(&bat_priv->tt.commit_lock);
3546 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3547 if (packet_size_max >= table_size)
3550 batadv_tt_local_purge(bat_priv, timeout);
3551 batadv_tt_local_purge_pending_clients(bat_priv);
3555 net_ratelimited_function(batadv_info, soft_iface,
3556 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3560 /* commit these changes immediately, to avoid synchronization problem
3564 batadv_tt_local_commit_changes_nolock(bat_priv);
3566 spin_unlock_bh(&bat_priv->tt.commit_lock);
3570 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3571 * @bat_priv: the bat priv with all the soft interface information
3572 * @orig: the orig_node of the ogm
3573 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3574 * @tvlv_value: tvlv buffer containing the gateway data
3575 * @tvlv_value_len: tvlv buffer length
3577 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3578 struct batadv_orig_node *orig,
3579 u8 flags, void *tvlv_value,
3582 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3583 struct batadv_tvlv_tt_change *tt_change;
3584 struct batadv_tvlv_tt_data *tt_data;
3585 u16 num_entries, num_vlan;
3587 if (tvlv_value_len < sizeof(*tt_data))
3590 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3591 tvlv_value_len -= sizeof(*tt_data);
3593 num_vlan = ntohs(tt_data->num_vlan);
3595 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3598 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3599 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3600 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3602 num_entries = batadv_tt_entries(tvlv_value_len);
3604 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3605 num_entries, tt_data->ttvn);
3609 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3611 * @bat_priv: the bat priv with all the soft interface information
3612 * @src: mac address of tt tvlv sender
3613 * @dst: mac address of tt tvlv recipient
3614 * @tvlv_value: tvlv buffer containing the tt data
3615 * @tvlv_value_len: tvlv buffer length
3617 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3620 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3625 struct batadv_tvlv_tt_data *tt_data;
3626 u16 tt_vlan_len, tt_num_entries;
3630 if (tvlv_value_len < sizeof(*tt_data))
3631 return NET_RX_SUCCESS;
3633 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3634 tvlv_value_len -= sizeof(*tt_data);
3636 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3637 tt_vlan_len *= ntohs(tt_data->num_vlan);
3639 if (tvlv_value_len < tt_vlan_len)
3640 return NET_RX_SUCCESS;
3642 tvlv_value_len -= tt_vlan_len;
3643 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3645 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3646 case BATADV_TT_REQUEST:
3647 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3649 /* If this node cannot provide a TT response the tt_request is
3652 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3654 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3659 batadv_dbg(BATADV_DBG_TT, bat_priv,
3660 "Routing TT_REQUEST to %pM [%c]\n",
3662 /* tvlv API will re-route the packet */
3666 case BATADV_TT_RESPONSE:
3667 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3669 if (batadv_is_my_mac(bat_priv, dst)) {
3670 batadv_handle_tt_response(bat_priv, tt_data,
3671 src, tt_num_entries);
3672 return NET_RX_SUCCESS;
3675 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3680 batadv_dbg(BATADV_DBG_TT, bat_priv,
3681 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3683 /* tvlv API will re-route the packet */
3687 return NET_RX_SUCCESS;
3691 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3692 * @bat_priv: the bat priv with all the soft interface information
3693 * @src: mac address of tt tvlv sender
3694 * @dst: mac address of tt tvlv recipient
3695 * @tvlv_value: tvlv buffer containing the tt data
3696 * @tvlv_value_len: tvlv buffer length
3698 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3701 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3706 struct batadv_tvlv_roam_adv *roaming_adv;
3707 struct batadv_orig_node *orig_node = NULL;
3709 /* If this node is not the intended recipient of the
3710 * roaming advertisement the packet is forwarded
3711 * (the tvlv API will re-route the packet).
3713 if (!batadv_is_my_mac(bat_priv, dst))
3716 if (tvlv_value_len < sizeof(*roaming_adv))
3719 orig_node = batadv_orig_hash_find(bat_priv, src);
3723 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3724 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3726 batadv_dbg(BATADV_DBG_TT, bat_priv,
3727 "Received ROAMING_ADV from %pM (client %pM)\n",
3728 src, roaming_adv->client);
3730 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3731 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3732 atomic_read(&orig_node->last_ttvn) + 1);
3736 batadv_orig_node_free_ref(orig_node);
3737 return NET_RX_SUCCESS;
3741 * batadv_tt_init - initialise the translation table internals
3742 * @bat_priv: the bat priv with all the soft interface information
3744 * Return 0 on success or negative error number in case of failure.
3746 int batadv_tt_init(struct batadv_priv *bat_priv)
3750 /* synchronized flags must be remote */
3751 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3753 ret = batadv_tt_local_init(bat_priv);
3757 ret = batadv_tt_global_init(bat_priv);
3761 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3762 batadv_tt_tvlv_unicast_handler_v1,
3763 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3765 batadv_tvlv_handler_register(bat_priv, NULL,
3766 batadv_roam_tvlv_unicast_handler_v1,
3767 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3769 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3770 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3771 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3777 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3778 * @bat_priv: the bat priv with all the soft interface information
3779 * @addr: the mac address of the client
3780 * @vid: the identifier of the VLAN where this client is connected
3782 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3785 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3786 const u8 *addr, unsigned short vid)
3788 struct batadv_tt_global_entry *tt;
3791 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3795 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3797 batadv_tt_global_entry_free_ref(tt);