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 hlist_del_init_rcu(&vlan->list);
307 spin_unlock_bh(&orig_node->vlan_list_lock);
308 batadv_orig_node_vlan_free_ref(vlan);
311 batadv_orig_node_vlan_free_ref(vlan);
315 * batadv_tt_global_size_inc - increase by one the global table size for the
317 * @orig_node: the originator which global table size has to be decreased
318 * @vid: the vlan identifier
320 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
323 batadv_tt_global_size_mod(orig_node, vid, 1);
327 * batadv_tt_global_size_dec - decrease by one the global table size for the
329 * @orig_node: the originator which global table size has to be decreased
330 * @vid: the vlan identifier
332 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
335 batadv_tt_global_size_mod(orig_node, vid, -1);
339 * batadv_tt_orig_list_entry_release - release tt orig entry from lists and
340 * queue for free after rcu grace period
341 * @orig_entry: tt orig entry to be free'd
344 batadv_tt_orig_list_entry_release(struct batadv_tt_orig_list_entry *orig_entry)
346 batadv_orig_node_free_ref(orig_entry->orig_node);
347 kfree_rcu(orig_entry, rcu);
351 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
353 if (!atomic_dec_and_test(&orig_entry->refcount))
356 batadv_tt_orig_list_entry_release(orig_entry);
360 * batadv_tt_local_event - store a local TT event (ADD/DEL)
361 * @bat_priv: the bat priv with all the soft interface information
362 * @tt_local_entry: the TT entry involved in the event
363 * @event_flags: flags to store in the event structure
365 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
366 struct batadv_tt_local_entry *tt_local_entry,
369 struct batadv_tt_change_node *tt_change_node, *entry, *safe;
370 struct batadv_tt_common_entry *common = &tt_local_entry->common;
371 u8 flags = common->flags | event_flags;
372 bool event_removed = false;
373 bool del_op_requested, del_op_entry;
375 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
379 tt_change_node->change.flags = flags;
380 memset(tt_change_node->change.reserved, 0,
381 sizeof(tt_change_node->change.reserved));
382 ether_addr_copy(tt_change_node->change.addr, common->addr);
383 tt_change_node->change.vid = htons(common->vid);
385 del_op_requested = flags & BATADV_TT_CLIENT_DEL;
387 /* check for ADD+DEL or DEL+ADD events */
388 spin_lock_bh(&bat_priv->tt.changes_list_lock);
389 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
391 if (!batadv_compare_eth(entry->change.addr, common->addr))
394 /* DEL+ADD in the same orig interval have no effect and can be
395 * removed to avoid silly behaviour on the receiver side. The
396 * other way around (ADD+DEL) can happen in case of roaming of
397 * a client still in the NEW state. Roaming of NEW clients is
398 * now possible due to automatically recognition of "temporary"
401 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
402 if (!del_op_requested && del_op_entry)
404 if (del_op_requested && !del_op_entry)
407 /* this is a second add in the same originator interval. It
408 * means that flags have been changed: update them!
410 if (!del_op_requested && !del_op_entry)
411 entry->change.flags = flags;
415 list_del(&entry->list);
417 kfree(tt_change_node);
418 event_removed = true;
422 /* track the change in the OGMinterval list */
423 list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
426 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
429 atomic_dec(&bat_priv->tt.local_changes);
431 atomic_inc(&bat_priv->tt.local_changes);
435 * batadv_tt_len - compute length in bytes of given number of tt changes
436 * @changes_num: number of tt changes
438 * Returns computed length in bytes.
440 static int batadv_tt_len(int changes_num)
442 return changes_num * sizeof(struct batadv_tvlv_tt_change);
446 * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
447 * @tt_len: available space
449 * Returns the number of entries.
451 static u16 batadv_tt_entries(u16 tt_len)
453 return tt_len / batadv_tt_len(1);
457 * batadv_tt_local_table_transmit_size - calculates the local translation table
458 * size when transmitted over the air
459 * @bat_priv: the bat priv with all the soft interface information
461 * Returns local translation table size in bytes.
463 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
466 u16 tt_local_entries = 0;
467 struct batadv_softif_vlan *vlan;
471 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
473 tt_local_entries += atomic_read(&vlan->tt.num_entries);
477 /* header size of tvlv encapsulated tt response payload */
478 hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
479 hdr_size += sizeof(struct batadv_tvlv_hdr);
480 hdr_size += sizeof(struct batadv_tvlv_tt_data);
481 hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
483 return hdr_size + batadv_tt_len(tt_local_entries);
486 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
488 if (bat_priv->tt.local_hash)
491 bat_priv->tt.local_hash = batadv_hash_new(1024);
493 if (!bat_priv->tt.local_hash)
496 batadv_hash_set_lock_class(bat_priv->tt.local_hash,
497 &batadv_tt_local_hash_lock_class_key);
502 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
503 struct batadv_tt_global_entry *tt_global,
506 batadv_dbg(BATADV_DBG_TT, bat_priv,
507 "Deleting global tt entry %pM (vid: %d): %s\n",
508 tt_global->common.addr,
509 BATADV_PRINT_VID(tt_global->common.vid), message);
511 batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
512 batadv_choose_tt, &tt_global->common);
513 batadv_tt_global_entry_free_ref(tt_global);
517 * batadv_tt_local_add - add a new client to the local table or update an
519 * @soft_iface: netdev struct of the mesh interface
520 * @addr: the mac address of the client to add
521 * @vid: VLAN identifier
522 * @ifindex: index of the interface where the client is connected to (useful to
523 * identify wireless clients)
524 * @mark: the value contained in the skb->mark field of the received packet (if
527 * Returns true if the client was successfully added, false otherwise.
529 bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
530 unsigned short vid, int ifindex, u32 mark)
532 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
533 struct batadv_tt_local_entry *tt_local;
534 struct batadv_tt_global_entry *tt_global = NULL;
535 struct batadv_softif_vlan *vlan;
536 struct net_device *in_dev = NULL;
537 struct hlist_head *head;
538 struct batadv_tt_orig_list_entry *orig_entry;
539 int hash_added, table_size, packet_size_max;
541 bool roamed_back = false;
545 if (ifindex != BATADV_NULL_IFINDEX)
546 in_dev = dev_get_by_index(&init_net, ifindex);
548 tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
550 if (!is_multicast_ether_addr(addr))
551 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
554 tt_local->last_seen = jiffies;
555 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
556 batadv_dbg(BATADV_DBG_TT, bat_priv,
557 "Re-adding pending client %pM (vid: %d)\n",
558 addr, BATADV_PRINT_VID(vid));
559 /* whatever the reason why the PENDING flag was set,
560 * this is a client which was enqueued to be removed in
561 * this orig_interval. Since it popped up again, the
562 * flag can be reset like it was never enqueued
564 tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
568 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
569 batadv_dbg(BATADV_DBG_TT, bat_priv,
570 "Roaming client %pM (vid: %d) came back to its original location\n",
571 addr, BATADV_PRINT_VID(vid));
572 /* the ROAM flag is set because this client roamed away
573 * and the node got a roaming_advertisement message. Now
574 * that the client popped up again at its original
575 * location such flag can be unset
577 tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
583 /* Ignore the client if we cannot send it in a full table response. */
584 table_size = batadv_tt_local_table_transmit_size(bat_priv);
585 table_size += batadv_tt_len(1);
586 packet_size_max = atomic_read(&bat_priv->packet_size_max);
587 if (table_size > packet_size_max) {
588 net_ratelimited_function(batadv_info, soft_iface,
589 "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
590 table_size, packet_size_max, addr);
594 tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
598 /* increase the refcounter of the related vlan */
599 vlan = batadv_softif_vlan_get(bat_priv, vid);
600 if (WARN(!vlan, "adding TT local entry %pM to non-existent VLAN %d",
601 addr, BATADV_PRINT_VID(vid))) {
607 batadv_dbg(BATADV_DBG_TT, bat_priv,
608 "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
609 addr, BATADV_PRINT_VID(vid),
610 (u8)atomic_read(&bat_priv->tt.vn));
612 ether_addr_copy(tt_local->common.addr, addr);
613 /* The local entry has to be marked as NEW to avoid to send it in
614 * a full table response going out before the next ttvn increment
615 * (consistency check)
617 tt_local->common.flags = BATADV_TT_CLIENT_NEW;
618 tt_local->common.vid = vid;
619 if (batadv_is_wifi_netdev(in_dev))
620 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
621 atomic_set(&tt_local->common.refcount, 2);
622 tt_local->last_seen = jiffies;
623 tt_local->common.added_at = tt_local->last_seen;
625 /* the batman interface mac and multicast addresses should never be
628 if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
629 is_multicast_ether_addr(addr))
630 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
632 hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
633 batadv_choose_tt, &tt_local->common,
634 &tt_local->common.hash_entry);
636 if (unlikely(hash_added != 0)) {
637 /* remove the reference for the hash */
638 batadv_tt_local_entry_free_ref(tt_local);
639 batadv_softif_vlan_free_ref(vlan);
644 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
647 /* Check whether it is a roaming, but don't do anything if the roaming
648 * process has already been handled
650 if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
651 /* These node are probably going to update their tt table */
652 head = &tt_global->orig_list;
654 hlist_for_each_entry_rcu(orig_entry, head, list) {
655 batadv_send_roam_adv(bat_priv, tt_global->common.addr,
656 tt_global->common.vid,
657 orig_entry->orig_node);
661 batadv_tt_global_free(bat_priv, tt_global,
665 /* The global entry has to be marked as ROAMING and
666 * has to be kept for consistency purpose
668 tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
669 tt_global->roam_at = jiffies;
673 /* store the current remote flags before altering them. This helps
674 * understanding is flags are changing or not
676 remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
678 if (batadv_is_wifi_netdev(in_dev))
679 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
681 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
683 /* check the mark in the skb: if it's equal to the configured
684 * isolation_mark, it means the packet is coming from an isolated
687 match_mark = (mark & bat_priv->isolation_mark_mask);
688 if (bat_priv->isolation_mark_mask &&
689 match_mark == bat_priv->isolation_mark)
690 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
692 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
694 /* if any "dynamic" flag has been modified, resend an ADD event for this
695 * entry so that all the nodes can get the new flags
697 if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
698 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
705 batadv_tt_local_entry_free_ref(tt_local);
707 batadv_tt_global_entry_free_ref(tt_global);
712 * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
713 * within a TT Response directed to another node
714 * @orig_node: originator for which the TT data has to be prepared
715 * @tt_data: uninitialised pointer to the address of the TVLV buffer
716 * @tt_change: uninitialised pointer to the address of the area where the TT
717 * changed can be stored
718 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
719 * function reserves the amount of space needed to send the entire global TT
720 * table. In case of success the value is updated with the real amount of
723 * Allocate the needed amount of memory for the entire TT TVLV and write its
724 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
725 * objects, one per active VLAN served by the originator node.
727 * Return the size of the allocated buffer or 0 in case of failure.
730 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
731 struct batadv_tvlv_tt_data **tt_data,
732 struct batadv_tvlv_tt_change **tt_change,
739 struct batadv_tvlv_tt_vlan_data *tt_vlan;
740 struct batadv_orig_node_vlan *vlan;
744 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
746 num_entries += atomic_read(&vlan->tt.num_entries);
749 change_offset = sizeof(**tt_data);
750 change_offset += num_vlan * sizeof(*tt_vlan);
752 /* if tt_len is negative, allocate the space needed by the full table */
754 *tt_len = batadv_tt_len(num_entries);
757 tvlv_len += change_offset;
759 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
765 (*tt_data)->flags = BATADV_NO_FLAGS;
766 (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
767 (*tt_data)->num_vlan = htons(num_vlan);
769 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
770 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
771 tt_vlan->vid = htons(vlan->vid);
772 tt_vlan->crc = htonl(vlan->tt.crc);
777 tt_change_ptr = (u8 *)*tt_data + change_offset;
778 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
786 * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
788 * @bat_priv: the bat priv with all the soft interface information
789 * @tt_data: uninitialised pointer to the address of the TVLV buffer
790 * @tt_change: uninitialised pointer to the address of the area where the TT
791 * changes can be stored
792 * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
793 * function reserves the amount of space needed to send the entire local TT
794 * table. In case of success the value is updated with the real amount of
797 * Allocate the needed amount of memory for the entire TT TVLV and write its
798 * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
799 * objects, one per active VLAN.
801 * Return the size of the allocated buffer or 0 in case of failure.
804 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
805 struct batadv_tvlv_tt_data **tt_data,
806 struct batadv_tvlv_tt_change **tt_change,
809 struct batadv_tvlv_tt_vlan_data *tt_vlan;
810 struct batadv_softif_vlan *vlan;
818 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
820 num_entries += atomic_read(&vlan->tt.num_entries);
823 change_offset = sizeof(**tt_data);
824 change_offset += num_vlan * sizeof(*tt_vlan);
826 /* if tt_len is negative, allocate the space needed by the full table */
828 *tt_len = batadv_tt_len(num_entries);
831 tvlv_len += change_offset;
833 *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
839 (*tt_data)->flags = BATADV_NO_FLAGS;
840 (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
841 (*tt_data)->num_vlan = htons(num_vlan);
843 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
844 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
845 tt_vlan->vid = htons(vlan->vid);
846 tt_vlan->crc = htonl(vlan->tt.crc);
851 tt_change_ptr = (u8 *)*tt_data + change_offset;
852 *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
860 * batadv_tt_tvlv_container_update - update the translation table tvlv container
861 * after local tt changes have been committed
862 * @bat_priv: the bat priv with all the soft interface information
864 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
866 struct batadv_tt_change_node *entry, *safe;
867 struct batadv_tvlv_tt_data *tt_data;
868 struct batadv_tvlv_tt_change *tt_change;
869 int tt_diff_len, tt_change_len = 0;
870 int tt_diff_entries_num = 0;
871 int tt_diff_entries_count = 0;
874 tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
875 tt_diff_len = batadv_tt_len(tt_diff_entries_num);
877 /* if we have too many changes for one packet don't send any
878 * and wait for the tt table request which will be fragmented
880 if (tt_diff_len > bat_priv->soft_iface->mtu)
883 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
884 &tt_change, &tt_diff_len);
888 tt_data->flags = BATADV_TT_OGM_DIFF;
890 if (tt_diff_len == 0)
891 goto container_register;
893 spin_lock_bh(&bat_priv->tt.changes_list_lock);
894 atomic_set(&bat_priv->tt.local_changes, 0);
896 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
898 if (tt_diff_entries_count < tt_diff_entries_num) {
899 memcpy(tt_change + tt_diff_entries_count,
901 sizeof(struct batadv_tvlv_tt_change));
902 tt_diff_entries_count++;
904 list_del(&entry->list);
907 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
909 /* Keep the buffer for possible tt_request */
910 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
911 kfree(bat_priv->tt.last_changeset);
912 bat_priv->tt.last_changeset_len = 0;
913 bat_priv->tt.last_changeset = NULL;
914 tt_change_len = batadv_tt_len(tt_diff_entries_count);
915 /* check whether this new OGM has no changes due to size problems */
916 if (tt_diff_entries_count > 0) {
917 /* if kmalloc() fails we will reply with the full table
918 * instead of providing the diff
920 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
921 if (bat_priv->tt.last_changeset) {
922 memcpy(bat_priv->tt.last_changeset,
923 tt_change, tt_change_len);
924 bat_priv->tt.last_changeset_len = tt_diff_len;
927 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
930 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
935 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
937 struct net_device *net_dev = (struct net_device *)seq->private;
938 struct batadv_priv *bat_priv = netdev_priv(net_dev);
939 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
940 struct batadv_tt_common_entry *tt_common_entry;
941 struct batadv_tt_local_entry *tt_local;
942 struct batadv_hard_iface *primary_if;
943 struct batadv_softif_vlan *vlan;
944 struct hlist_head *head;
949 unsigned long last_seen_jiffies;
951 u16 np_flag = BATADV_TT_CLIENT_NOPURGE;
953 primary_if = batadv_seq_print_text_primary_if_get(seq);
958 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
959 net_dev->name, (u8)atomic_read(&bat_priv->tt.vn));
960 seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID",
961 "Flags", "Last seen", "CRC");
963 for (i = 0; i < hash->size; i++) {
964 head = &hash->table[i];
967 hlist_for_each_entry_rcu(tt_common_entry,
969 tt_local = container_of(tt_common_entry,
970 struct batadv_tt_local_entry,
972 vid = tt_common_entry->vid;
973 last_seen_jiffies = jiffies - tt_local->last_seen;
974 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
975 last_seen_secs = last_seen_msecs / 1000;
976 last_seen_msecs = last_seen_msecs % 1000;
978 no_purge = tt_common_entry->flags & np_flag;
980 vlan = batadv_softif_vlan_get(bat_priv, vid);
982 seq_printf(seq, "Cannot retrieve VLAN %d\n",
983 BATADV_PRINT_VID(vid));
988 " * %pM %4i [%c%c%c%c%c%c] %3u.%03u (%#.8x)\n",
989 tt_common_entry->addr,
990 BATADV_PRINT_VID(tt_common_entry->vid),
991 ((tt_common_entry->flags &
992 BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
993 no_purge ? 'P' : '.',
994 ((tt_common_entry->flags &
995 BATADV_TT_CLIENT_NEW) ? 'N' : '.'),
996 ((tt_common_entry->flags &
997 BATADV_TT_CLIENT_PENDING) ? 'X' : '.'),
998 ((tt_common_entry->flags &
999 BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1000 ((tt_common_entry->flags &
1001 BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1002 no_purge ? 0 : last_seen_secs,
1003 no_purge ? 0 : last_seen_msecs,
1006 batadv_softif_vlan_free_ref(vlan);
1012 batadv_hardif_free_ref(primary_if);
1017 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
1018 struct batadv_tt_local_entry *tt_local_entry,
1019 u16 flags, const char *message)
1021 batadv_tt_local_event(bat_priv, tt_local_entry, flags);
1023 /* The local client has to be marked as "pending to be removed" but has
1024 * to be kept in the table in order to send it in a full table
1025 * response issued before the net ttvn increment (consistency check)
1027 tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
1029 batadv_dbg(BATADV_DBG_TT, bat_priv,
1030 "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
1031 tt_local_entry->common.addr,
1032 BATADV_PRINT_VID(tt_local_entry->common.vid), message);
1036 * batadv_tt_local_remove - logically remove an entry from the local table
1037 * @bat_priv: the bat priv with all the soft interface information
1038 * @addr: the MAC address of the client to remove
1039 * @vid: VLAN identifier
1040 * @message: message to append to the log on deletion
1041 * @roaming: true if the deletion is due to a roaming event
1043 * Returns the flags assigned to the local entry before being deleted
1045 u16 batadv_tt_local_remove(struct batadv_priv *bat_priv, const u8 *addr,
1046 unsigned short vid, const char *message,
1049 struct batadv_tt_local_entry *tt_local_entry;
1050 u16 flags, curr_flags = BATADV_NO_FLAGS;
1051 struct batadv_softif_vlan *vlan;
1052 void *tt_entry_exists;
1054 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
1055 if (!tt_local_entry)
1058 curr_flags = tt_local_entry->common.flags;
1060 flags = BATADV_TT_CLIENT_DEL;
1061 /* if this global entry addition is due to a roaming, the node has to
1062 * mark the local entry as "roamed" in order to correctly reroute
1066 flags |= BATADV_TT_CLIENT_ROAM;
1067 /* mark the local client as ROAMed */
1068 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1071 if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1072 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1076 /* if this client has been added right now, it is possible to
1077 * immediately purge it
1079 batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1081 tt_entry_exists = batadv_hash_remove(bat_priv->tt.local_hash,
1084 &tt_local_entry->common);
1085 if (!tt_entry_exists)
1088 /* extra call to free the local tt entry */
1089 batadv_tt_local_entry_free_ref(tt_local_entry);
1091 /* decrease the reference held for this vlan */
1092 vlan = batadv_softif_vlan_get(bat_priv, vid);
1096 batadv_softif_vlan_free_ref(vlan);
1097 batadv_softif_vlan_free_ref(vlan);
1101 batadv_tt_local_entry_free_ref(tt_local_entry);
1107 * batadv_tt_local_purge_list - purge inactive tt local entries
1108 * @bat_priv: the bat priv with all the soft interface information
1109 * @head: pointer to the list containing the local tt entries
1110 * @timeout: parameter deciding whether a given tt local entry is considered
1113 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1114 struct hlist_head *head,
1117 struct batadv_tt_local_entry *tt_local_entry;
1118 struct batadv_tt_common_entry *tt_common_entry;
1119 struct hlist_node *node_tmp;
1121 hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1123 tt_local_entry = container_of(tt_common_entry,
1124 struct batadv_tt_local_entry,
1126 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1129 /* entry already marked for deletion */
1130 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1133 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1136 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1137 BATADV_TT_CLIENT_DEL, "timed out");
1142 * batadv_tt_local_purge - purge inactive tt local entries
1143 * @bat_priv: the bat priv with all the soft interface information
1144 * @timeout: parameter deciding whether a given tt local entry is considered
1147 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1150 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1151 struct hlist_head *head;
1152 spinlock_t *list_lock; /* protects write access to the hash lists */
1155 for (i = 0; i < hash->size; i++) {
1156 head = &hash->table[i];
1157 list_lock = &hash->list_locks[i];
1159 spin_lock_bh(list_lock);
1160 batadv_tt_local_purge_list(bat_priv, head, timeout);
1161 spin_unlock_bh(list_lock);
1165 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1167 struct batadv_hashtable *hash;
1168 spinlock_t *list_lock; /* protects write access to the hash lists */
1169 struct batadv_tt_common_entry *tt_common_entry;
1170 struct batadv_tt_local_entry *tt_local;
1171 struct batadv_softif_vlan *vlan;
1172 struct hlist_node *node_tmp;
1173 struct hlist_head *head;
1176 if (!bat_priv->tt.local_hash)
1179 hash = bat_priv->tt.local_hash;
1181 for (i = 0; i < hash->size; i++) {
1182 head = &hash->table[i];
1183 list_lock = &hash->list_locks[i];
1185 spin_lock_bh(list_lock);
1186 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1188 hlist_del_rcu(&tt_common_entry->hash_entry);
1189 tt_local = container_of(tt_common_entry,
1190 struct batadv_tt_local_entry,
1193 /* decrease the reference held for this vlan */
1194 vlan = batadv_softif_vlan_get(bat_priv,
1195 tt_common_entry->vid);
1197 batadv_softif_vlan_free_ref(vlan);
1198 batadv_softif_vlan_free_ref(vlan);
1201 batadv_tt_local_entry_free_ref(tt_local);
1203 spin_unlock_bh(list_lock);
1206 batadv_hash_destroy(hash);
1208 bat_priv->tt.local_hash = NULL;
1211 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1213 if (bat_priv->tt.global_hash)
1216 bat_priv->tt.global_hash = batadv_hash_new(1024);
1218 if (!bat_priv->tt.global_hash)
1221 batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1222 &batadv_tt_global_hash_lock_class_key);
1227 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1229 struct batadv_tt_change_node *entry, *safe;
1231 spin_lock_bh(&bat_priv->tt.changes_list_lock);
1233 list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1235 list_del(&entry->list);
1239 atomic_set(&bat_priv->tt.local_changes, 0);
1240 spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1243 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1244 * batadv_tt_global_entry list
1246 * returns it with an increased refcounter, NULL if not found
1248 static struct batadv_tt_orig_list_entry *
1249 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1250 const struct batadv_orig_node *orig_node)
1252 struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1253 const struct hlist_head *head;
1256 head = &entry->orig_list;
1257 hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1258 if (tmp_orig_entry->orig_node != orig_node)
1260 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1263 orig_entry = tmp_orig_entry;
1271 /* find out if an orig_node is already in the list of a tt_global_entry.
1272 * returns true if found, false otherwise
1275 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1276 const struct batadv_orig_node *orig_node)
1278 struct batadv_tt_orig_list_entry *orig_entry;
1281 orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1284 batadv_tt_orig_list_entry_free_ref(orig_entry);
1291 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1292 struct batadv_orig_node *orig_node, int ttvn)
1294 struct batadv_tt_orig_list_entry *orig_entry;
1296 orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1298 /* refresh the ttvn: the current value could be a bogus one that
1299 * was added during a "temporary client detection"
1301 orig_entry->ttvn = ttvn;
1305 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1309 INIT_HLIST_NODE(&orig_entry->list);
1310 atomic_inc(&orig_node->refcount);
1311 batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1312 orig_entry->orig_node = orig_node;
1313 orig_entry->ttvn = ttvn;
1314 atomic_set(&orig_entry->refcount, 2);
1316 spin_lock_bh(&tt_global->list_lock);
1317 hlist_add_head_rcu(&orig_entry->list,
1318 &tt_global->orig_list);
1319 spin_unlock_bh(&tt_global->list_lock);
1320 atomic_inc(&tt_global->orig_list_count);
1324 batadv_tt_orig_list_entry_free_ref(orig_entry);
1328 * batadv_tt_global_add - add a new TT global entry or update an existing one
1329 * @bat_priv: the bat priv with all the soft interface information
1330 * @orig_node: the originator announcing the client
1331 * @tt_addr: the mac address of the non-mesh client
1332 * @vid: VLAN identifier
1333 * @flags: TT flags that have to be set for this non-mesh client
1334 * @ttvn: the tt version number ever announcing this non-mesh client
1336 * Add a new TT global entry for the given originator. If the entry already
1337 * exists add a new reference to the given originator (a global entry can have
1338 * references to multiple originators) and adjust the flags attribute to reflect
1339 * the function argument.
1340 * If a TT local entry exists for this non-mesh client remove it.
1342 * The caller must hold orig_node refcount.
1344 * Return true if the new entry has been added, false otherwise
1346 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1347 struct batadv_orig_node *orig_node,
1348 const unsigned char *tt_addr,
1349 unsigned short vid, u16 flags, u8 ttvn)
1351 struct batadv_tt_global_entry *tt_global_entry;
1352 struct batadv_tt_local_entry *tt_local_entry;
1355 struct batadv_tt_common_entry *common;
1358 /* ignore global entries from backbone nodes */
1359 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1362 tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1363 tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1365 /* if the node already has a local client for this entry, it has to wait
1366 * for a roaming advertisement instead of manually messing up the global
1369 if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1370 !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1373 if (!tt_global_entry) {
1374 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1375 if (!tt_global_entry)
1378 common = &tt_global_entry->common;
1379 ether_addr_copy(common->addr, tt_addr);
1382 common->flags = flags;
1383 tt_global_entry->roam_at = 0;
1384 /* node must store current time in case of roaming. This is
1385 * needed to purge this entry out on timeout (if nobody claims
1388 if (flags & BATADV_TT_CLIENT_ROAM)
1389 tt_global_entry->roam_at = jiffies;
1390 atomic_set(&common->refcount, 2);
1391 common->added_at = jiffies;
1393 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1394 atomic_set(&tt_global_entry->orig_list_count, 0);
1395 spin_lock_init(&tt_global_entry->list_lock);
1397 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1399 batadv_choose_tt, common,
1400 &common->hash_entry);
1402 if (unlikely(hash_added != 0)) {
1403 /* remove the reference for the hash */
1404 batadv_tt_global_entry_free_ref(tt_global_entry);
1408 common = &tt_global_entry->common;
1409 /* If there is already a global entry, we can use this one for
1411 * But if we are trying to add a temporary client then here are
1412 * two options at this point:
1413 * 1) the global client is not a temporary client: the global
1414 * client has to be left as it is, temporary information
1415 * should never override any already known client state
1416 * 2) the global client is a temporary client: purge the
1417 * originator list and add the new one orig_entry
1419 if (flags & BATADV_TT_CLIENT_TEMP) {
1420 if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1422 if (batadv_tt_global_entry_has_orig(tt_global_entry,
1425 batadv_tt_global_del_orig_list(tt_global_entry);
1426 goto add_orig_entry;
1429 /* if the client was temporary added before receiving the first
1430 * OGM announcing it, we have to clear the TEMP flag. Also,
1431 * remove the previous temporary orig node and re-add it
1432 * if required. If the orig entry changed, the new one which
1433 * is a non-temporary entry is preferred.
1435 if (common->flags & BATADV_TT_CLIENT_TEMP) {
1436 batadv_tt_global_del_orig_list(tt_global_entry);
1437 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1440 /* the change can carry possible "attribute" flags like the
1441 * TT_CLIENT_WIFI, therefore they have to be copied in the
1444 common->flags |= flags;
1446 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1447 * one originator left in the list and we previously received a
1448 * delete + roaming change for this originator.
1450 * We should first delete the old originator before adding the
1453 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1454 batadv_tt_global_del_orig_list(tt_global_entry);
1455 common->flags &= ~BATADV_TT_CLIENT_ROAM;
1456 tt_global_entry->roam_at = 0;
1460 /* add the new orig_entry (if needed) or update it */
1461 batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1463 batadv_dbg(BATADV_DBG_TT, bat_priv,
1464 "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1465 common->addr, BATADV_PRINT_VID(common->vid),
1470 /* Do not remove multicast addresses from the local hash on
1473 if (is_multicast_ether_addr(tt_addr))
1476 /* remove address from local hash if present */
1477 local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1478 "global tt received",
1479 flags & BATADV_TT_CLIENT_ROAM);
1480 tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1482 if (!(flags & BATADV_TT_CLIENT_ROAM))
1483 /* this is a normal global add. Therefore the client is not in a
1484 * roaming state anymore.
1486 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1489 if (tt_global_entry)
1490 batadv_tt_global_entry_free_ref(tt_global_entry);
1492 batadv_tt_local_entry_free_ref(tt_local_entry);
1497 * batadv_transtable_best_orig - Get best originator list entry from tt entry
1498 * @bat_priv: the bat priv with all the soft interface information
1499 * @tt_global_entry: global translation table entry to be analyzed
1501 * This functon assumes the caller holds rcu_read_lock().
1502 * Returns best originator list entry or NULL on errors.
1504 static struct batadv_tt_orig_list_entry *
1505 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1506 struct batadv_tt_global_entry *tt_global_entry)
1508 struct batadv_neigh_node *router, *best_router = NULL;
1509 struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1510 struct hlist_head *head;
1511 struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1513 head = &tt_global_entry->orig_list;
1514 hlist_for_each_entry_rcu(orig_entry, head, list) {
1515 router = batadv_orig_router_get(orig_entry->orig_node,
1521 bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1522 best_router, BATADV_IF_DEFAULT) <= 0) {
1523 batadv_neigh_node_free_ref(router);
1527 /* release the refcount for the "old" best */
1529 batadv_neigh_node_free_ref(best_router);
1531 best_entry = orig_entry;
1532 best_router = router;
1536 batadv_neigh_node_free_ref(best_router);
1542 * batadv_tt_global_print_entry - print all orig nodes who announce the address
1543 * for this global entry
1544 * @bat_priv: the bat priv with all the soft interface information
1545 * @tt_global_entry: global translation table entry to be printed
1546 * @seq: debugfs table seq_file struct
1548 * This functon assumes the caller holds rcu_read_lock().
1551 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1552 struct batadv_tt_global_entry *tt_global_entry,
1553 struct seq_file *seq)
1555 struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1556 struct batadv_tt_common_entry *tt_common_entry;
1557 struct batadv_orig_node_vlan *vlan;
1558 struct hlist_head *head;
1562 tt_common_entry = &tt_global_entry->common;
1563 flags = tt_common_entry->flags;
1565 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1567 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1568 tt_common_entry->vid);
1571 " * Cannot retrieve VLAN %d for originator %pM\n",
1572 BATADV_PRINT_VID(tt_common_entry->vid),
1573 best_entry->orig_node->orig);
1577 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1579 " %c %pM %4i (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1580 '*', tt_global_entry->common.addr,
1581 BATADV_PRINT_VID(tt_global_entry->common.vid),
1582 best_entry->ttvn, best_entry->orig_node->orig,
1583 last_ttvn, vlan->tt.crc,
1584 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1585 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1586 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1587 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1589 batadv_orig_node_vlan_free_ref(vlan);
1593 head = &tt_global_entry->orig_list;
1595 hlist_for_each_entry_rcu(orig_entry, head, list) {
1596 if (best_entry == orig_entry)
1599 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1600 tt_common_entry->vid);
1603 " + Cannot retrieve VLAN %d for originator %pM\n",
1604 BATADV_PRINT_VID(tt_common_entry->vid),
1605 orig_entry->orig_node->orig);
1609 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1611 " %c %pM %4d (%3u) via %pM (%3u) (%#.8x) [%c%c%c%c]\n",
1612 '+', tt_global_entry->common.addr,
1613 BATADV_PRINT_VID(tt_global_entry->common.vid),
1614 orig_entry->ttvn, orig_entry->orig_node->orig,
1615 last_ttvn, vlan->tt.crc,
1616 ((flags & BATADV_TT_CLIENT_ROAM) ? 'R' : '.'),
1617 ((flags & BATADV_TT_CLIENT_WIFI) ? 'W' : '.'),
1618 ((flags & BATADV_TT_CLIENT_ISOLA) ? 'I' : '.'),
1619 ((flags & BATADV_TT_CLIENT_TEMP) ? 'T' : '.'));
1621 batadv_orig_node_vlan_free_ref(vlan);
1625 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1627 struct net_device *net_dev = (struct net_device *)seq->private;
1628 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1629 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1630 struct batadv_tt_common_entry *tt_common_entry;
1631 struct batadv_tt_global_entry *tt_global;
1632 struct batadv_hard_iface *primary_if;
1633 struct hlist_head *head;
1636 primary_if = batadv_seq_print_text_primary_if_get(seq);
1641 "Globally announced TT entries received via the mesh %s\n",
1643 seq_printf(seq, " %-13s %s %s %-15s %s (%-10s) %s\n",
1644 "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1647 for (i = 0; i < hash->size; i++) {
1648 head = &hash->table[i];
1651 hlist_for_each_entry_rcu(tt_common_entry,
1653 tt_global = container_of(tt_common_entry,
1654 struct batadv_tt_global_entry,
1656 batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1662 batadv_hardif_free_ref(primary_if);
1667 * _batadv_tt_global_del_orig_entry - remove and free an orig_entry
1668 * @tt_global_entry: the global entry to remove the orig_entry from
1669 * @orig_entry: the orig entry to remove and free
1671 * Remove an orig_entry from its list in the given tt_global_entry and
1672 * free this orig_entry afterwards.
1674 * Caller must hold tt_global_entry->list_lock and ensure orig_entry->list is
1678 _batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
1679 struct batadv_tt_orig_list_entry *orig_entry)
1681 lockdep_assert_held(&tt_global_entry->list_lock);
1683 batadv_tt_global_size_dec(orig_entry->orig_node,
1684 tt_global_entry->common.vid);
1685 atomic_dec(&tt_global_entry->orig_list_count);
1686 /* requires holding tt_global_entry->list_lock and orig_entry->list
1687 * being part of a list
1689 hlist_del_rcu(&orig_entry->list);
1690 batadv_tt_orig_list_entry_free_ref(orig_entry);
1693 /* deletes the orig list of a tt_global_entry */
1695 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1697 struct hlist_head *head;
1698 struct hlist_node *safe;
1699 struct batadv_tt_orig_list_entry *orig_entry;
1701 spin_lock_bh(&tt_global_entry->list_lock);
1702 head = &tt_global_entry->orig_list;
1703 hlist_for_each_entry_safe(orig_entry, safe, head, list)
1704 _batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
1705 spin_unlock_bh(&tt_global_entry->list_lock);
1709 * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
1710 * @bat_priv: the bat priv with all the soft interface information
1711 * @tt_global_entry: the global entry to remove the orig_node from
1712 * @orig_node: the originator announcing the client
1713 * @message: message to append to the log on deletion
1715 * Remove the given orig_node and its according orig_entry from the given
1719 batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
1720 struct batadv_tt_global_entry *tt_global_entry,
1721 struct batadv_orig_node *orig_node,
1722 const char *message)
1724 struct hlist_head *head;
1725 struct hlist_node *safe;
1726 struct batadv_tt_orig_list_entry *orig_entry;
1729 spin_lock_bh(&tt_global_entry->list_lock);
1730 head = &tt_global_entry->orig_list;
1731 hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1732 if (orig_entry->orig_node == orig_node) {
1733 vid = tt_global_entry->common.vid;
1734 batadv_dbg(BATADV_DBG_TT, bat_priv,
1735 "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1737 tt_global_entry->common.addr,
1738 BATADV_PRINT_VID(vid), message);
1739 _batadv_tt_global_del_orig_entry(tt_global_entry,
1743 spin_unlock_bh(&tt_global_entry->list_lock);
1746 /* If the client is to be deleted, we check if it is the last origantor entry
1747 * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1748 * timer, otherwise we simply remove the originator scheduled for deletion.
1751 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1752 struct batadv_tt_global_entry *tt_global_entry,
1753 struct batadv_orig_node *orig_node,
1754 const char *message)
1756 bool last_entry = true;
1757 struct hlist_head *head;
1758 struct batadv_tt_orig_list_entry *orig_entry;
1760 /* no local entry exists, case 1:
1761 * Check if this is the last one or if other entries exist.
1765 head = &tt_global_entry->orig_list;
1766 hlist_for_each_entry_rcu(orig_entry, head, list) {
1767 if (orig_entry->orig_node != orig_node) {
1775 /* its the last one, mark for roaming. */
1776 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1777 tt_global_entry->roam_at = jiffies;
1779 /* there is another entry, we can simply delete this
1780 * one and can still use the other one.
1782 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1783 orig_node, message);
1787 * batadv_tt_global_del - remove a client from the global table
1788 * @bat_priv: the bat priv with all the soft interface information
1789 * @orig_node: an originator serving this client
1790 * @addr: the mac address of the client
1791 * @vid: VLAN identifier
1792 * @message: a message explaining the reason for deleting the client to print
1793 * for debugging purpose
1794 * @roaming: true if the deletion has been triggered by a roaming event
1796 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1797 struct batadv_orig_node *orig_node,
1798 const unsigned char *addr, unsigned short vid,
1799 const char *message, bool roaming)
1801 struct batadv_tt_global_entry *tt_global_entry;
1802 struct batadv_tt_local_entry *local_entry = NULL;
1804 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1805 if (!tt_global_entry)
1809 batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
1810 orig_node, message);
1812 if (hlist_empty(&tt_global_entry->orig_list))
1813 batadv_tt_global_free(bat_priv, tt_global_entry,
1819 /* if we are deleting a global entry due to a roam
1820 * event, there are two possibilities:
1821 * 1) the client roamed from node A to node B => if there
1822 * is only one originator left for this client, we mark
1823 * it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1824 * wait for node B to claim it. In case of timeout
1825 * the entry is purged.
1827 * If there are other originators left, we directly delete
1829 * 2) the client roamed to us => we can directly delete
1830 * the global entry, since it is useless now.
1832 local_entry = batadv_tt_local_hash_find(bat_priv,
1833 tt_global_entry->common.addr,
1836 /* local entry exists, case 2: client roamed to us. */
1837 batadv_tt_global_del_orig_list(tt_global_entry);
1838 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1840 /* no local entry exists, case 1: check for roaming */
1841 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1842 orig_node, message);
1845 if (tt_global_entry)
1846 batadv_tt_global_entry_free_ref(tt_global_entry);
1848 batadv_tt_local_entry_free_ref(local_entry);
1852 * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1853 * given originator matching the provided vid
1854 * @bat_priv: the bat priv with all the soft interface information
1855 * @orig_node: the originator owning the entries to remove
1856 * @match_vid: the VLAN identifier to match. If negative all the entries will be
1858 * @message: debug message to print as "reason"
1860 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1861 struct batadv_orig_node *orig_node,
1863 const char *message)
1865 struct batadv_tt_global_entry *tt_global;
1866 struct batadv_tt_common_entry *tt_common_entry;
1868 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1869 struct hlist_node *safe;
1870 struct hlist_head *head;
1871 spinlock_t *list_lock; /* protects write access to the hash lists */
1877 for (i = 0; i < hash->size; i++) {
1878 head = &hash->table[i];
1879 list_lock = &hash->list_locks[i];
1881 spin_lock_bh(list_lock);
1882 hlist_for_each_entry_safe(tt_common_entry, safe,
1884 /* remove only matching entries */
1885 if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1888 tt_global = container_of(tt_common_entry,
1889 struct batadv_tt_global_entry,
1892 batadv_tt_global_del_orig_node(bat_priv, tt_global,
1893 orig_node, message);
1895 if (hlist_empty(&tt_global->orig_list)) {
1896 vid = tt_global->common.vid;
1897 batadv_dbg(BATADV_DBG_TT, bat_priv,
1898 "Deleting global tt entry %pM (vid: %d): %s\n",
1899 tt_global->common.addr,
1900 BATADV_PRINT_VID(vid), message);
1901 hlist_del_rcu(&tt_common_entry->hash_entry);
1902 batadv_tt_global_entry_free_ref(tt_global);
1905 spin_unlock_bh(list_lock);
1907 clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
1910 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1914 unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1915 unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1917 if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1918 batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1920 *msg = "Roaming timeout\n";
1923 if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1924 batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1926 *msg = "Temporary client timeout\n";
1932 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1934 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1935 struct hlist_head *head;
1936 struct hlist_node *node_tmp;
1937 spinlock_t *list_lock; /* protects write access to the hash lists */
1940 struct batadv_tt_common_entry *tt_common;
1941 struct batadv_tt_global_entry *tt_global;
1943 for (i = 0; i < hash->size; i++) {
1944 head = &hash->table[i];
1945 list_lock = &hash->list_locks[i];
1947 spin_lock_bh(list_lock);
1948 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1950 tt_global = container_of(tt_common,
1951 struct batadv_tt_global_entry,
1954 if (!batadv_tt_global_to_purge(tt_global, &msg))
1957 batadv_dbg(BATADV_DBG_TT, bat_priv,
1958 "Deleting global tt entry %pM (vid: %d): %s\n",
1959 tt_global->common.addr,
1960 BATADV_PRINT_VID(tt_global->common.vid),
1963 hlist_del_rcu(&tt_common->hash_entry);
1965 batadv_tt_global_entry_free_ref(tt_global);
1967 spin_unlock_bh(list_lock);
1971 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1973 struct batadv_hashtable *hash;
1974 spinlock_t *list_lock; /* protects write access to the hash lists */
1975 struct batadv_tt_common_entry *tt_common_entry;
1976 struct batadv_tt_global_entry *tt_global;
1977 struct hlist_node *node_tmp;
1978 struct hlist_head *head;
1981 if (!bat_priv->tt.global_hash)
1984 hash = bat_priv->tt.global_hash;
1986 for (i = 0; i < hash->size; i++) {
1987 head = &hash->table[i];
1988 list_lock = &hash->list_locks[i];
1990 spin_lock_bh(list_lock);
1991 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1993 hlist_del_rcu(&tt_common_entry->hash_entry);
1994 tt_global = container_of(tt_common_entry,
1995 struct batadv_tt_global_entry,
1997 batadv_tt_global_entry_free_ref(tt_global);
1999 spin_unlock_bh(list_lock);
2002 batadv_hash_destroy(hash);
2004 bat_priv->tt.global_hash = NULL;
2008 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
2009 struct batadv_tt_global_entry *tt_global_entry)
2013 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
2014 tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
2017 /* check if the two clients are marked as isolated */
2018 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
2019 tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
2026 * batadv_transtable_search - get the mesh destination for a given client
2027 * @bat_priv: the bat priv with all the soft interface information
2028 * @src: mac address of the source client
2029 * @addr: mac address of the destination client
2030 * @vid: VLAN identifier
2032 * Returns a pointer to the originator that was selected as destination in the
2033 * mesh for contacting the client 'addr', NULL otherwise.
2034 * In case of multiple originators serving the same client, the function returns
2035 * the best one (best in terms of metric towards the destination node).
2037 * If the two clients are AP isolated the function returns NULL.
2039 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
2044 struct batadv_tt_local_entry *tt_local_entry = NULL;
2045 struct batadv_tt_global_entry *tt_global_entry = NULL;
2046 struct batadv_orig_node *orig_node = NULL;
2047 struct batadv_tt_orig_list_entry *best_entry;
2049 if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
2050 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
2051 if (!tt_local_entry ||
2052 (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
2056 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
2057 if (!tt_global_entry)
2060 /* check whether the clients should not communicate due to AP
2063 if (tt_local_entry &&
2064 _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
2068 best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
2069 /* found anything? */
2071 orig_node = best_entry->orig_node;
2072 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
2077 if (tt_global_entry)
2078 batadv_tt_global_entry_free_ref(tt_global_entry);
2080 batadv_tt_local_entry_free_ref(tt_local_entry);
2086 * batadv_tt_global_crc - calculates the checksum of the local table belonging
2087 * to the given orig_node
2088 * @bat_priv: the bat priv with all the soft interface information
2089 * @orig_node: originator for which the CRC should be computed
2090 * @vid: VLAN identifier for which the CRC32 has to be computed
2092 * This function computes the checksum for the global table corresponding to a
2093 * specific originator. In particular, the checksum is computed as follows: For
2094 * each client connected to the originator the CRC32C of the MAC address and the
2095 * VID is computed and then all the CRC32Cs of the various clients are xor'ed
2098 * The idea behind is that CRC32C should be used as much as possible in order to
2099 * produce a unique hash of the table, but since the order which is used to feed
2100 * the CRC32C function affects the result and since every node in the network
2101 * probably sorts the clients differently, the hash function cannot be directly
2102 * computed over the entire table. Hence the CRC32C is used only on
2103 * the single client entry, while all the results are then xor'ed together
2104 * because the XOR operation can combine them all while trying to reduce the
2105 * noise as much as possible.
2107 * Returns the checksum of the global table of a given originator.
2109 static u32 batadv_tt_global_crc(struct batadv_priv *bat_priv,
2110 struct batadv_orig_node *orig_node,
2113 struct batadv_hashtable *hash = bat_priv->tt.global_hash;
2114 struct batadv_tt_common_entry *tt_common;
2115 struct batadv_tt_global_entry *tt_global;
2116 struct hlist_head *head;
2117 u32 i, crc_tmp, crc = 0;
2121 for (i = 0; i < hash->size; i++) {
2122 head = &hash->table[i];
2125 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2126 tt_global = container_of(tt_common,
2127 struct batadv_tt_global_entry,
2129 /* compute the CRC only for entries belonging to the
2130 * VLAN identified by the vid passed as parameter
2132 if (tt_common->vid != vid)
2135 /* Roaming clients are in the global table for
2136 * consistency only. They don't have to be
2137 * taken into account while computing the
2140 if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
2142 /* Temporary clients have not been announced yet, so
2143 * they have to be skipped while computing the global
2146 if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2149 /* find out if this global entry is announced by this
2152 if (!batadv_tt_global_entry_has_orig(tt_global,
2156 /* use network order to read the VID: this ensures that
2157 * every node reads the bytes in the same order.
2159 tmp_vid = htons(tt_common->vid);
2160 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2162 /* compute the CRC on flags that have to be kept in sync
2165 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2166 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2168 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2177 * batadv_tt_local_crc - calculates the checksum of the local table
2178 * @bat_priv: the bat priv with all the soft interface information
2179 * @vid: VLAN identifier for which the CRC32 has to be computed
2181 * For details about the computation, please refer to the documentation for
2182 * batadv_tt_global_crc().
2184 * Returns the checksum of the local table
2186 static u32 batadv_tt_local_crc(struct batadv_priv *bat_priv,
2189 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2190 struct batadv_tt_common_entry *tt_common;
2191 struct hlist_head *head;
2192 u32 i, crc_tmp, crc = 0;
2196 for (i = 0; i < hash->size; i++) {
2197 head = &hash->table[i];
2200 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2201 /* compute the CRC only for entries belonging to the
2202 * VLAN identified by vid
2204 if (tt_common->vid != vid)
2207 /* not yet committed clients have not to be taken into
2208 * account while computing the CRC
2210 if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2213 /* use network order to read the VID: this ensures that
2214 * every node reads the bytes in the same order.
2216 tmp_vid = htons(tt_common->vid);
2217 crc_tmp = crc32c(0, &tmp_vid, sizeof(tmp_vid));
2219 /* compute the CRC on flags that have to be kept in sync
2222 flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2223 crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2225 crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2233 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2235 struct batadv_tt_req_node *node;
2236 struct hlist_node *safe;
2238 spin_lock_bh(&bat_priv->tt.req_list_lock);
2240 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2241 hlist_del_init(&node->list);
2245 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2248 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2249 struct batadv_orig_node *orig_node,
2250 const void *tt_buff,
2253 /* Replace the old buffer only if I received something in the
2254 * last OGM (the OGM could carry no changes)
2256 spin_lock_bh(&orig_node->tt_buff_lock);
2257 if (tt_buff_len > 0) {
2258 kfree(orig_node->tt_buff);
2259 orig_node->tt_buff_len = 0;
2260 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2261 if (orig_node->tt_buff) {
2262 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2263 orig_node->tt_buff_len = tt_buff_len;
2266 spin_unlock_bh(&orig_node->tt_buff_lock);
2269 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2271 struct batadv_tt_req_node *node;
2272 struct hlist_node *safe;
2274 spin_lock_bh(&bat_priv->tt.req_list_lock);
2275 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2276 if (batadv_has_timed_out(node->issued_at,
2277 BATADV_TT_REQUEST_TIMEOUT)) {
2278 hlist_del_init(&node->list);
2282 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2286 * batadv_tt_req_node_new - search and possibly create a tt_req_node object
2287 * @bat_priv: the bat priv with all the soft interface information
2288 * @orig_node: orig node this request is being issued for
2290 * Returns the pointer to the new tt_req_node struct if no request
2291 * has already been issued for this orig_node, NULL otherwise.
2293 static struct batadv_tt_req_node *
2294 batadv_tt_req_node_new(struct batadv_priv *bat_priv,
2295 struct batadv_orig_node *orig_node)
2297 struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2299 spin_lock_bh(&bat_priv->tt.req_list_lock);
2300 hlist_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2301 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2302 !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2303 BATADV_TT_REQUEST_TIMEOUT))
2307 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2311 ether_addr_copy(tt_req_node->addr, orig_node->orig);
2312 tt_req_node->issued_at = jiffies;
2314 hlist_add_head(&tt_req_node->list, &bat_priv->tt.req_list);
2316 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2321 * batadv_tt_local_valid - verify that given tt entry is a valid one
2322 * @entry_ptr: to be checked local tt entry
2323 * @data_ptr: not used but definition required to satisfy the callback prototype
2325 * Returns 1 if the entry is a valid, 0 otherwise.
2327 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2329 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2331 if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2336 static int batadv_tt_global_valid(const void *entry_ptr,
2337 const void *data_ptr)
2339 const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2340 const struct batadv_tt_global_entry *tt_global_entry;
2341 const struct batadv_orig_node *orig_node = data_ptr;
2343 if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2344 tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2347 tt_global_entry = container_of(tt_common_entry,
2348 struct batadv_tt_global_entry,
2351 return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2355 * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2357 * @bat_priv: the bat priv with all the soft interface information
2358 * @hash: hash table containing the tt entries
2359 * @tt_len: expected tvlv tt data buffer length in number of bytes
2360 * @tvlv_buff: pointer to the buffer to fill with the TT data
2361 * @valid_cb: function to filter tt change entries
2362 * @cb_data: data passed to the filter function as argument
2364 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2365 struct batadv_hashtable *hash,
2366 void *tvlv_buff, u16 tt_len,
2367 int (*valid_cb)(const void *, const void *),
2370 struct batadv_tt_common_entry *tt_common_entry;
2371 struct batadv_tvlv_tt_change *tt_change;
2372 struct hlist_head *head;
2373 u16 tt_tot, tt_num_entries = 0;
2376 tt_tot = batadv_tt_entries(tt_len);
2377 tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2380 for (i = 0; i < hash->size; i++) {
2381 head = &hash->table[i];
2383 hlist_for_each_entry_rcu(tt_common_entry,
2385 if (tt_tot == tt_num_entries)
2388 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2391 ether_addr_copy(tt_change->addr, tt_common_entry->addr);
2392 tt_change->flags = tt_common_entry->flags;
2393 tt_change->vid = htons(tt_common_entry->vid);
2394 memset(tt_change->reserved, 0,
2395 sizeof(tt_change->reserved));
2405 * batadv_tt_global_check_crc - check if all the CRCs are correct
2406 * @orig_node: originator for which the CRCs have to be checked
2407 * @tt_vlan: pointer to the first tvlv VLAN entry
2408 * @num_vlan: number of tvlv VLAN entries
2409 * @create: if true, create VLAN objects if not found
2411 * Return true if all the received CRCs match the locally stored ones, false
2414 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2415 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2418 struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2419 struct batadv_orig_node_vlan *vlan;
2420 int i, orig_num_vlan;
2423 /* check if each received CRC matches the locally stored one */
2424 for (i = 0; i < num_vlan; i++) {
2425 tt_vlan_tmp = tt_vlan + i;
2427 /* if orig_node is a backbone node for this VLAN, don't check
2428 * the CRC as we ignore all the global entries over it
2430 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2432 ntohs(tt_vlan_tmp->vid)))
2435 vlan = batadv_orig_node_vlan_get(orig_node,
2436 ntohs(tt_vlan_tmp->vid));
2441 batadv_orig_node_vlan_free_ref(vlan);
2443 if (crc != ntohl(tt_vlan_tmp->crc))
2447 /* check if any excess VLANs exist locally for the originator
2448 * which are not mentioned in the TVLV from the originator.
2452 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list)
2456 if (orig_num_vlan > num_vlan)
2463 * batadv_tt_local_update_crc - update all the local CRCs
2464 * @bat_priv: the bat priv with all the soft interface information
2466 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2468 struct batadv_softif_vlan *vlan;
2470 /* recompute the global CRC for each VLAN */
2472 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2473 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2479 * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2480 * @bat_priv: the bat priv with all the soft interface information
2481 * @orig_node: the orig_node for which the CRCs have to be updated
2483 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2484 struct batadv_orig_node *orig_node)
2486 struct batadv_orig_node_vlan *vlan;
2489 /* recompute the global CRC for each VLAN */
2491 hlist_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2492 /* if orig_node is a backbone node for this VLAN, don't compute
2493 * the CRC as we ignore all the global entries over it
2495 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2499 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2506 * batadv_send_tt_request - send a TT Request message to a given node
2507 * @bat_priv: the bat priv with all the soft interface information
2508 * @dst_orig_node: the destination of the message
2509 * @ttvn: the version number that the source of the message is looking for
2510 * @tt_vlan: pointer to the first tvlv VLAN object to request
2511 * @num_vlan: number of tvlv VLAN entries
2512 * @full_table: ask for the entire translation table if true, while only for the
2513 * last TT diff otherwise
2515 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2516 struct batadv_orig_node *dst_orig_node,
2518 struct batadv_tvlv_tt_vlan_data *tt_vlan,
2519 u16 num_vlan, bool full_table)
2521 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2522 struct batadv_tt_req_node *tt_req_node = NULL;
2523 struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2524 struct batadv_hard_iface *primary_if;
2528 primary_if = batadv_primary_if_get_selected(bat_priv);
2532 /* The new tt_req will be issued only if I'm not waiting for a
2533 * reply from the same orig_node yet
2535 tt_req_node = batadv_tt_req_node_new(bat_priv, dst_orig_node);
2539 size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2540 tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2544 tvlv_tt_data->flags = BATADV_TT_REQUEST;
2545 tvlv_tt_data->ttvn = ttvn;
2546 tvlv_tt_data->num_vlan = htons(num_vlan);
2548 /* send all the CRCs within the request. This is needed by intermediate
2549 * nodes to ensure they have the correct table before replying
2551 tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2552 for (i = 0; i < num_vlan; i++) {
2553 tt_vlan_req->vid = tt_vlan->vid;
2554 tt_vlan_req->crc = tt_vlan->crc;
2561 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2563 batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2564 dst_orig_node->orig, full_table ? 'F' : '.');
2566 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2567 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2568 dst_orig_node->orig, BATADV_TVLV_TT, 1,
2569 tvlv_tt_data, size);
2574 batadv_hardif_free_ref(primary_if);
2575 if (ret && tt_req_node) {
2576 spin_lock_bh(&bat_priv->tt.req_list_lock);
2577 /* hlist_del_init() verifies tt_req_node still is in the list */
2578 hlist_del_init(&tt_req_node->list);
2579 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2582 kfree(tvlv_tt_data);
2587 * batadv_send_other_tt_response - send reply to tt request concerning another
2588 * node's translation table
2589 * @bat_priv: the bat priv with all the soft interface information
2590 * @tt_data: tt data containing the tt request information
2591 * @req_src: mac address of tt request sender
2592 * @req_dst: mac address of tt request recipient
2594 * Returns true if tt request reply was sent, false otherwise.
2596 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2597 struct batadv_tvlv_tt_data *tt_data,
2598 u8 *req_src, u8 *req_dst)
2600 struct batadv_orig_node *req_dst_orig_node;
2601 struct batadv_orig_node *res_dst_orig_node = NULL;
2602 struct batadv_tvlv_tt_change *tt_change;
2603 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2604 struct batadv_tvlv_tt_vlan_data *tt_vlan;
2605 bool ret = false, full_table;
2606 u8 orig_ttvn, req_ttvn;
2610 batadv_dbg(BATADV_DBG_TT, bat_priv,
2611 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2612 req_src, tt_data->ttvn, req_dst,
2613 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2615 /* Let's get the orig node of the REAL destination */
2616 req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2617 if (!req_dst_orig_node)
2620 res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2621 if (!res_dst_orig_node)
2624 orig_ttvn = (u8)atomic_read(&req_dst_orig_node->last_ttvn);
2625 req_ttvn = tt_data->ttvn;
2627 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2628 /* this node doesn't have the requested data */
2629 if (orig_ttvn != req_ttvn ||
2630 !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2631 ntohs(tt_data->num_vlan)))
2634 /* If the full table has been explicitly requested */
2635 if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2636 !req_dst_orig_node->tt_buff)
2641 /* TT fragmentation hasn't been implemented yet, so send as many
2642 * TT entries fit a single packet as possible only
2645 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2646 tt_len = req_dst_orig_node->tt_buff_len;
2648 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2655 /* Copy the last orig_node's OGM buffer */
2656 memcpy(tt_change, req_dst_orig_node->tt_buff,
2657 req_dst_orig_node->tt_buff_len);
2658 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2660 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2661 * in the initial part
2664 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2671 /* fill the rest of the tvlv with the real TT entries */
2672 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2674 batadv_tt_global_valid,
2678 /* Don't send the response, if larger than fragmented packet. */
2679 tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2680 if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2681 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2682 "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2683 res_dst_orig_node->orig);
2687 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2688 tvlv_tt_data->ttvn = req_ttvn;
2691 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2693 batadv_dbg(BATADV_DBG_TT, bat_priv,
2694 "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2695 res_dst_orig_node->orig, req_dst_orig_node->orig,
2696 full_table ? 'F' : '.', req_ttvn);
2698 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2700 batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2701 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2708 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2711 if (res_dst_orig_node)
2712 batadv_orig_node_free_ref(res_dst_orig_node);
2713 if (req_dst_orig_node)
2714 batadv_orig_node_free_ref(req_dst_orig_node);
2715 kfree(tvlv_tt_data);
2720 * batadv_send_my_tt_response - send reply to tt request concerning this node's
2722 * @bat_priv: the bat priv with all the soft interface information
2723 * @tt_data: tt data containing the tt request information
2724 * @req_src: mac address of tt request sender
2726 * Returns true if tt request reply was sent, false otherwise.
2728 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2729 struct batadv_tvlv_tt_data *tt_data,
2732 struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2733 struct batadv_hard_iface *primary_if = NULL;
2734 struct batadv_tvlv_tt_change *tt_change;
2735 struct batadv_orig_node *orig_node;
2736 u8 my_ttvn, req_ttvn;
2741 batadv_dbg(BATADV_DBG_TT, bat_priv,
2742 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2743 req_src, tt_data->ttvn,
2744 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2746 spin_lock_bh(&bat_priv->tt.commit_lock);
2748 my_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2749 req_ttvn = tt_data->ttvn;
2751 orig_node = batadv_orig_hash_find(bat_priv, req_src);
2755 primary_if = batadv_primary_if_get_selected(bat_priv);
2759 /* If the full table has been explicitly requested or the gap
2760 * is too big send the whole local translation table
2762 if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2763 !bat_priv->tt.last_changeset)
2768 /* TT fragmentation hasn't been implemented yet, so send as many
2769 * TT entries fit a single packet as possible only
2772 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2774 tt_len = bat_priv->tt.last_changeset_len;
2775 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2782 /* Copy the last orig_node's OGM buffer */
2783 memcpy(tt_change, bat_priv->tt.last_changeset,
2784 bat_priv->tt.last_changeset_len);
2785 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2787 req_ttvn = (u8)atomic_read(&bat_priv->tt.vn);
2789 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2790 * in the initial part
2793 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2800 /* fill the rest of the tvlv with the real TT entries */
2801 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2803 batadv_tt_local_valid, NULL);
2806 tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2807 tvlv_tt_data->ttvn = req_ttvn;
2810 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2812 batadv_dbg(BATADV_DBG_TT, bat_priv,
2813 "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2814 orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2816 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2818 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2819 req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2825 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2827 spin_unlock_bh(&bat_priv->tt.commit_lock);
2829 batadv_orig_node_free_ref(orig_node);
2831 batadv_hardif_free_ref(primary_if);
2832 kfree(tvlv_tt_data);
2833 /* The packet was for this host, so it doesn't need to be re-routed */
2838 * batadv_send_tt_response - send reply to tt request
2839 * @bat_priv: the bat priv with all the soft interface information
2840 * @tt_data: tt data containing the tt request information
2841 * @req_src: mac address of tt request sender
2842 * @req_dst: mac address of tt request recipient
2844 * Returns true if tt request reply was sent, false otherwise.
2846 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2847 struct batadv_tvlv_tt_data *tt_data,
2848 u8 *req_src, u8 *req_dst)
2850 if (batadv_is_my_mac(bat_priv, req_dst))
2851 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2852 return batadv_send_other_tt_response(bat_priv, tt_data, req_src,
2856 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2857 struct batadv_orig_node *orig_node,
2858 struct batadv_tvlv_tt_change *tt_change,
2859 u16 tt_num_changes, u8 ttvn)
2864 for (i = 0; i < tt_num_changes; i++) {
2865 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2866 roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2867 batadv_tt_global_del(bat_priv, orig_node,
2868 (tt_change + i)->addr,
2869 ntohs((tt_change + i)->vid),
2870 "tt removed by changes",
2873 if (!batadv_tt_global_add(bat_priv, orig_node,
2874 (tt_change + i)->addr,
2875 ntohs((tt_change + i)->vid),
2876 (tt_change + i)->flags, ttvn))
2877 /* In case of problem while storing a
2878 * global_entry, we stop the updating
2879 * procedure without committing the
2880 * ttvn change. This will avoid to send
2881 * corrupted data on tt_request
2886 set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
2889 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2890 struct batadv_tvlv_tt_change *tt_change,
2891 u8 ttvn, u8 *resp_src,
2894 struct batadv_orig_node *orig_node;
2896 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2900 /* Purge the old table first.. */
2901 batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2902 "Received full table");
2904 _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2907 spin_lock_bh(&orig_node->tt_buff_lock);
2908 kfree(orig_node->tt_buff);
2909 orig_node->tt_buff_len = 0;
2910 orig_node->tt_buff = NULL;
2911 spin_unlock_bh(&orig_node->tt_buff_lock);
2913 atomic_set(&orig_node->last_ttvn, ttvn);
2917 batadv_orig_node_free_ref(orig_node);
2920 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2921 struct batadv_orig_node *orig_node,
2922 u16 tt_num_changes, u8 ttvn,
2923 struct batadv_tvlv_tt_change *tt_change)
2925 _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2926 tt_num_changes, ttvn);
2928 batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2929 batadv_tt_len(tt_num_changes));
2930 atomic_set(&orig_node->last_ttvn, ttvn);
2934 * batadv_is_my_client - check if a client is served by the local node
2935 * @bat_priv: the bat priv with all the soft interface information
2936 * @addr: the mac address of the client to check
2937 * @vid: VLAN identifier
2939 * Returns true if the client is served by this node, false otherwise.
2941 bool batadv_is_my_client(struct batadv_priv *bat_priv, const u8 *addr,
2944 struct batadv_tt_local_entry *tt_local_entry;
2947 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2948 if (!tt_local_entry)
2950 /* Check if the client has been logically deleted (but is kept for
2951 * consistency purpose)
2953 if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2954 (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2959 batadv_tt_local_entry_free_ref(tt_local_entry);
2964 * batadv_handle_tt_response - process incoming tt reply
2965 * @bat_priv: the bat priv with all the soft interface information
2966 * @tt_data: tt data containing the tt request information
2967 * @resp_src: mac address of tt reply sender
2968 * @num_entries: number of tt change entries appended to the tt data
2970 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2971 struct batadv_tvlv_tt_data *tt_data,
2972 u8 *resp_src, u16 num_entries)
2974 struct batadv_tt_req_node *node;
2975 struct hlist_node *safe;
2976 struct batadv_orig_node *orig_node = NULL;
2977 struct batadv_tvlv_tt_change *tt_change;
2978 u8 *tvlv_ptr = (u8 *)tt_data;
2981 batadv_dbg(BATADV_DBG_TT, bat_priv,
2982 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2983 resp_src, tt_data->ttvn, num_entries,
2984 ((tt_data->flags & BATADV_TT_FULL_TABLE) ? 'F' : '.'));
2986 orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2990 spin_lock_bh(&orig_node->tt_lock);
2992 change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2993 change_offset *= ntohs(tt_data->num_vlan);
2994 change_offset += sizeof(*tt_data);
2995 tvlv_ptr += change_offset;
2997 tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2998 if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2999 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
3000 resp_src, num_entries);
3002 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
3003 tt_data->ttvn, tt_change);
3006 /* Recalculate the CRC for this orig_node and store it */
3007 batadv_tt_global_update_crc(bat_priv, orig_node);
3009 spin_unlock_bh(&orig_node->tt_lock);
3011 /* Delete the tt_req_node from pending tt_requests list */
3012 spin_lock_bh(&bat_priv->tt.req_list_lock);
3013 hlist_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
3014 if (!batadv_compare_eth(node->addr, resp_src))
3016 hlist_del_init(&node->list);
3020 spin_unlock_bh(&bat_priv->tt.req_list_lock);
3023 batadv_orig_node_free_ref(orig_node);
3026 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
3028 struct batadv_tt_roam_node *node, *safe;
3030 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3032 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3033 list_del(&node->list);
3037 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3040 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
3042 struct batadv_tt_roam_node *node, *safe;
3044 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3045 list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
3046 if (!batadv_has_timed_out(node->first_time,
3047 BATADV_ROAMING_MAX_TIME))
3050 list_del(&node->list);
3053 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3056 /* This function checks whether the client already reached the
3057 * maximum number of possible roaming phases. In this case the ROAMING_ADV
3060 * returns true if the ROAMING_ADV can be sent, false otherwise
3062 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
3064 struct batadv_tt_roam_node *tt_roam_node;
3067 spin_lock_bh(&bat_priv->tt.roam_list_lock);
3068 /* The new tt_req will be issued only if I'm not waiting for a
3069 * reply from the same orig_node yet
3071 list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
3072 if (!batadv_compare_eth(tt_roam_node->addr, client))
3075 if (batadv_has_timed_out(tt_roam_node->first_time,
3076 BATADV_ROAMING_MAX_TIME))
3079 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
3080 /* Sorry, you roamed too many times! */
3087 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
3091 tt_roam_node->first_time = jiffies;
3092 atomic_set(&tt_roam_node->counter,
3093 BATADV_ROAMING_MAX_COUNT - 1);
3094 ether_addr_copy(tt_roam_node->addr, client);
3096 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
3101 spin_unlock_bh(&bat_priv->tt.roam_list_lock);
3106 * batadv_send_roam_adv - send a roaming advertisement message
3107 * @bat_priv: the bat priv with all the soft interface information
3108 * @client: mac address of the roaming client
3109 * @vid: VLAN identifier
3110 * @orig_node: message destination
3112 * Send a ROAMING_ADV message to the node which was previously serving this
3113 * client. This is done to inform the node that from now on all traffic destined
3114 * for this particular roamed client has to be forwarded to the sender of the
3117 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, u8 *client,
3119 struct batadv_orig_node *orig_node)
3121 struct batadv_hard_iface *primary_if;
3122 struct batadv_tvlv_roam_adv tvlv_roam;
3124 primary_if = batadv_primary_if_get_selected(bat_priv);
3128 /* before going on we have to check whether the client has
3129 * already roamed to us too many times
3131 if (!batadv_tt_check_roam_count(bat_priv, client))
3134 batadv_dbg(BATADV_DBG_TT, bat_priv,
3135 "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
3136 orig_node->orig, client, BATADV_PRINT_VID(vid));
3138 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
3140 memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
3141 tvlv_roam.vid = htons(vid);
3143 batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
3144 orig_node->orig, BATADV_TVLV_ROAM, 1,
3145 &tvlv_roam, sizeof(tvlv_roam));
3149 batadv_hardif_free_ref(primary_if);
3152 static void batadv_tt_purge(struct work_struct *work)
3154 struct delayed_work *delayed_work;
3155 struct batadv_priv_tt *priv_tt;
3156 struct batadv_priv *bat_priv;
3158 delayed_work = container_of(work, struct delayed_work, work);
3159 priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
3160 bat_priv = container_of(priv_tt, struct batadv_priv, tt);
3162 batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
3163 batadv_tt_global_purge(bat_priv);
3164 batadv_tt_req_purge(bat_priv);
3165 batadv_tt_roam_purge(bat_priv);
3167 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3168 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3171 void batadv_tt_free(struct batadv_priv *bat_priv)
3173 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3174 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3176 cancel_delayed_work_sync(&bat_priv->tt.work);
3178 batadv_tt_local_table_free(bat_priv);
3179 batadv_tt_global_table_free(bat_priv);
3180 batadv_tt_req_list_free(bat_priv);
3181 batadv_tt_changes_list_free(bat_priv);
3182 batadv_tt_roam_list_free(bat_priv);
3184 kfree(bat_priv->tt.last_changeset);
3188 * batadv_tt_local_set_flags - set or unset the specified flags on the local
3189 * table and possibly count them in the TT size
3190 * @bat_priv: the bat priv with all the soft interface information
3191 * @flags: the flag to switch
3192 * @enable: whether to set or unset the flag
3193 * @count: whether to increase the TT size by the number of changed entries
3195 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, u16 flags,
3196 bool enable, bool count)
3198 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3199 struct batadv_tt_common_entry *tt_common_entry;
3200 u16 changed_num = 0;
3201 struct hlist_head *head;
3207 for (i = 0; i < hash->size; i++) {
3208 head = &hash->table[i];
3211 hlist_for_each_entry_rcu(tt_common_entry,
3214 if ((tt_common_entry->flags & flags) == flags)
3216 tt_common_entry->flags |= flags;
3218 if (!(tt_common_entry->flags & flags))
3220 tt_common_entry->flags &= ~flags;
3227 batadv_tt_local_size_inc(bat_priv,
3228 tt_common_entry->vid);
3234 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3235 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3237 struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3238 struct batadv_tt_common_entry *tt_common;
3239 struct batadv_tt_local_entry *tt_local;
3240 struct batadv_softif_vlan *vlan;
3241 struct hlist_node *node_tmp;
3242 struct hlist_head *head;
3243 spinlock_t *list_lock; /* protects write access to the hash lists */
3249 for (i = 0; i < hash->size; i++) {
3250 head = &hash->table[i];
3251 list_lock = &hash->list_locks[i];
3253 spin_lock_bh(list_lock);
3254 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3256 if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3259 batadv_dbg(BATADV_DBG_TT, bat_priv,
3260 "Deleting local tt entry (%pM, vid: %d): pending\n",
3262 BATADV_PRINT_VID(tt_common->vid));
3264 batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3265 hlist_del_rcu(&tt_common->hash_entry);
3266 tt_local = container_of(tt_common,
3267 struct batadv_tt_local_entry,
3270 /* decrease the reference held for this vlan */
3271 vlan = batadv_softif_vlan_get(bat_priv, tt_common->vid);
3273 batadv_softif_vlan_free_ref(vlan);
3274 batadv_softif_vlan_free_ref(vlan);
3277 batadv_tt_local_entry_free_ref(tt_local);
3279 spin_unlock_bh(list_lock);
3284 * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3285 * which have been queued in the time since the last commit
3286 * @bat_priv: the bat priv with all the soft interface information
3288 * Caller must hold tt->commit_lock.
3290 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3292 lockdep_assert_held(&bat_priv->tt.commit_lock);
3294 /* Update multicast addresses in local translation table */
3295 batadv_mcast_mla_update(bat_priv);
3297 if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3298 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3299 batadv_tt_tvlv_container_update(bat_priv);
3303 batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3305 batadv_tt_local_purge_pending_clients(bat_priv);
3306 batadv_tt_local_update_crc(bat_priv);
3308 /* Increment the TTVN only once per OGM interval */
3309 atomic_inc(&bat_priv->tt.vn);
3310 batadv_dbg(BATADV_DBG_TT, bat_priv,
3311 "Local changes committed, updating to ttvn %u\n",
3312 (u8)atomic_read(&bat_priv->tt.vn));
3314 /* reset the sending counter */
3315 atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3316 batadv_tt_tvlv_container_update(bat_priv);
3320 * batadv_tt_local_commit_changes - commit all pending local tt changes which
3321 * have been queued in the time since the last commit
3322 * @bat_priv: the bat priv with all the soft interface information
3324 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3326 spin_lock_bh(&bat_priv->tt.commit_lock);
3327 batadv_tt_local_commit_changes_nolock(bat_priv);
3328 spin_unlock_bh(&bat_priv->tt.commit_lock);
3331 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, u8 *src, u8 *dst,
3334 struct batadv_tt_local_entry *tt_local_entry = NULL;
3335 struct batadv_tt_global_entry *tt_global_entry = NULL;
3336 struct batadv_softif_vlan *vlan;
3339 vlan = batadv_softif_vlan_get(bat_priv, vid);
3343 if (!atomic_read(&vlan->ap_isolation))
3346 tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3347 if (!tt_local_entry)
3350 tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3351 if (!tt_global_entry)
3354 if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3360 batadv_softif_vlan_free_ref(vlan);
3361 if (tt_global_entry)
3362 batadv_tt_global_entry_free_ref(tt_global_entry);
3364 batadv_tt_local_entry_free_ref(tt_local_entry);
3369 * batadv_tt_update_orig - update global translation table with new tt
3370 * information received via ogms
3371 * @bat_priv: the bat priv with all the soft interface information
3372 * @orig: the orig_node of the ogm
3373 * @tt_vlan: pointer to the first tvlv VLAN entry
3374 * @tt_num_vlan: number of tvlv VLAN entries
3375 * @tt_change: pointer to the first entry in the TT buffer
3376 * @tt_num_changes: number of tt changes inside the tt buffer
3377 * @ttvn: translation table version number of this changeset
3378 * @tt_crc: crc32 checksum of orig node's translation table
3380 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3381 struct batadv_orig_node *orig_node,
3382 const void *tt_buff, u16 tt_num_vlan,
3383 struct batadv_tvlv_tt_change *tt_change,
3384 u16 tt_num_changes, u8 ttvn)
3386 u8 orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn);
3387 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3388 bool full_table = true;
3391 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3392 has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
3393 &orig_node->capa_initialized);
3395 /* orig table not initialised AND first diff is in the OGM OR the ttvn
3396 * increased by one -> we can apply the attached changes
3398 if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
3399 /* the OGM could not contain the changes due to their size or
3400 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3402 * In this case send a tt request
3404 if (!tt_num_changes) {
3409 spin_lock_bh(&orig_node->tt_lock);
3411 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3414 /* Even if we received the precomputed crc with the OGM, we
3415 * prefer to recompute it to spot any possible inconsistency
3416 * in the global table
3418 batadv_tt_global_update_crc(bat_priv, orig_node);
3420 spin_unlock_bh(&orig_node->tt_lock);
3422 /* The ttvn alone is not enough to guarantee consistency
3423 * because a single value could represent different states
3424 * (due to the wrap around). Thus a node has to check whether
3425 * the resulting table (after applying the changes) is still
3426 * consistent or not. E.g. a node could disconnect while its
3427 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3428 * checking the CRC value is mandatory to detect the
3431 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3435 /* if we missed more than one change or our tables are not
3436 * in sync anymore -> request fresh tt data
3438 if (!has_tt_init || ttvn != orig_ttvn ||
3439 !batadv_tt_global_check_crc(orig_node, tt_vlan,
3442 batadv_dbg(BATADV_DBG_TT, bat_priv,
3443 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3444 orig_node->orig, ttvn, orig_ttvn,
3446 batadv_send_tt_request(bat_priv, orig_node, ttvn,
3447 tt_vlan, tt_num_vlan,
3455 * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3456 * @bat_priv: the bat priv with all the soft interface information
3457 * @addr: the mac address of the client to check
3458 * @vid: VLAN identifier
3460 * Returns true if we know that the client has moved from its old originator
3461 * to another one. This entry is still kept for consistency purposes and will be
3462 * deleted later by a DEL or because of timeout
3464 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3465 u8 *addr, unsigned short vid)
3467 struct batadv_tt_global_entry *tt_global_entry;
3470 tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3471 if (!tt_global_entry)
3474 ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3475 batadv_tt_global_entry_free_ref(tt_global_entry);
3481 * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3482 * @bat_priv: the bat priv with all the soft interface information
3483 * @addr: the mac address of the local client to query
3484 * @vid: VLAN identifier
3486 * Returns true if the local client is known to be roaming (it is not served by
3487 * this node anymore) or not. If yes, the client is still present in the table
3488 * to keep the latter consistent with the node TTVN
3490 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3491 u8 *addr, unsigned short vid)
3493 struct batadv_tt_local_entry *tt_local_entry;
3496 tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3497 if (!tt_local_entry)
3500 ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3501 batadv_tt_local_entry_free_ref(tt_local_entry);
3506 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3507 struct batadv_orig_node *orig_node,
3508 const unsigned char *addr,
3513 if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3514 BATADV_TT_CLIENT_TEMP,
3515 atomic_read(&orig_node->last_ttvn)))
3518 batadv_dbg(BATADV_DBG_TT, bat_priv,
3519 "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3520 addr, BATADV_PRINT_VID(vid), orig_node->orig);
3527 * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3528 * maximum packet size that can be transported through the mesh
3529 * @soft_iface: netdev struct of the mesh interface
3531 * Remove entries older than 'timeout' and half timeout if more entries need
3534 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3536 struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3537 int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3538 int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3539 bool reduced = false;
3541 spin_lock_bh(&bat_priv->tt.commit_lock);
3544 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3545 if (packet_size_max >= table_size)
3548 batadv_tt_local_purge(bat_priv, timeout);
3549 batadv_tt_local_purge_pending_clients(bat_priv);
3553 net_ratelimited_function(batadv_info, soft_iface,
3554 "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3558 /* commit these changes immediately, to avoid synchronization problem
3562 batadv_tt_local_commit_changes_nolock(bat_priv);
3564 spin_unlock_bh(&bat_priv->tt.commit_lock);
3568 * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3569 * @bat_priv: the bat priv with all the soft interface information
3570 * @orig: the orig_node of the ogm
3571 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3572 * @tvlv_value: tvlv buffer containing the gateway data
3573 * @tvlv_value_len: tvlv buffer length
3575 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3576 struct batadv_orig_node *orig,
3577 u8 flags, void *tvlv_value,
3580 struct batadv_tvlv_tt_vlan_data *tt_vlan;
3581 struct batadv_tvlv_tt_change *tt_change;
3582 struct batadv_tvlv_tt_data *tt_data;
3583 u16 num_entries, num_vlan;
3585 if (tvlv_value_len < sizeof(*tt_data))
3588 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3589 tvlv_value_len -= sizeof(*tt_data);
3591 num_vlan = ntohs(tt_data->num_vlan);
3593 if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3596 tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3597 tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3598 tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3600 num_entries = batadv_tt_entries(tvlv_value_len);
3602 batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3603 num_entries, tt_data->ttvn);
3607 * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3609 * @bat_priv: the bat priv with all the soft interface information
3610 * @src: mac address of tt tvlv sender
3611 * @dst: mac address of tt tvlv recipient
3612 * @tvlv_value: tvlv buffer containing the tt data
3613 * @tvlv_value_len: tvlv buffer length
3615 * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3618 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3623 struct batadv_tvlv_tt_data *tt_data;
3624 u16 tt_vlan_len, tt_num_entries;
3628 if (tvlv_value_len < sizeof(*tt_data))
3629 return NET_RX_SUCCESS;
3631 tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3632 tvlv_value_len -= sizeof(*tt_data);
3634 tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3635 tt_vlan_len *= ntohs(tt_data->num_vlan);
3637 if (tvlv_value_len < tt_vlan_len)
3638 return NET_RX_SUCCESS;
3640 tvlv_value_len -= tt_vlan_len;
3641 tt_num_entries = batadv_tt_entries(tvlv_value_len);
3643 switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3644 case BATADV_TT_REQUEST:
3645 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3647 /* If this node cannot provide a TT response the tt_request is
3650 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3652 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3657 batadv_dbg(BATADV_DBG_TT, bat_priv,
3658 "Routing TT_REQUEST to %pM [%c]\n",
3660 /* tvlv API will re-route the packet */
3664 case BATADV_TT_RESPONSE:
3665 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3667 if (batadv_is_my_mac(bat_priv, dst)) {
3668 batadv_handle_tt_response(bat_priv, tt_data,
3669 src, tt_num_entries);
3670 return NET_RX_SUCCESS;
3673 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3678 batadv_dbg(BATADV_DBG_TT, bat_priv,
3679 "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3681 /* tvlv API will re-route the packet */
3685 return NET_RX_SUCCESS;
3689 * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3690 * @bat_priv: the bat priv with all the soft interface information
3691 * @src: mac address of tt tvlv sender
3692 * @dst: mac address of tt tvlv recipient
3693 * @tvlv_value: tvlv buffer containing the tt data
3694 * @tvlv_value_len: tvlv buffer length
3696 * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3699 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3704 struct batadv_tvlv_roam_adv *roaming_adv;
3705 struct batadv_orig_node *orig_node = NULL;
3707 /* If this node is not the intended recipient of the
3708 * roaming advertisement the packet is forwarded
3709 * (the tvlv API will re-route the packet).
3711 if (!batadv_is_my_mac(bat_priv, dst))
3714 if (tvlv_value_len < sizeof(*roaming_adv))
3717 orig_node = batadv_orig_hash_find(bat_priv, src);
3721 batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3722 roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3724 batadv_dbg(BATADV_DBG_TT, bat_priv,
3725 "Received ROAMING_ADV from %pM (client %pM)\n",
3726 src, roaming_adv->client);
3728 batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3729 ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3730 atomic_read(&orig_node->last_ttvn) + 1);
3734 batadv_orig_node_free_ref(orig_node);
3735 return NET_RX_SUCCESS;
3739 * batadv_tt_init - initialise the translation table internals
3740 * @bat_priv: the bat priv with all the soft interface information
3742 * Return 0 on success or negative error number in case of failure.
3744 int batadv_tt_init(struct batadv_priv *bat_priv)
3748 /* synchronized flags must be remote */
3749 BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3751 ret = batadv_tt_local_init(bat_priv);
3755 ret = batadv_tt_global_init(bat_priv);
3759 batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3760 batadv_tt_tvlv_unicast_handler_v1,
3761 BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3763 batadv_tvlv_handler_register(bat_priv, NULL,
3764 batadv_roam_tvlv_unicast_handler_v1,
3765 BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3767 INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3768 queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3769 msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3775 * batadv_tt_global_is_isolated - check if a client is marked as isolated
3776 * @bat_priv: the bat priv with all the soft interface information
3777 * @addr: the mac address of the client
3778 * @vid: the identifier of the VLAN where this client is connected
3780 * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3783 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3784 const u8 *addr, unsigned short vid)
3786 struct batadv_tt_global_entry *tt;
3789 tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3793 ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3795 batadv_tt_global_entry_free_ref(tt);