1 /* Copyright (C) 2011-2014 B.A.T.M.A.N. contributors:
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/>.
20 #include "hard-interface.h"
21 #include "originator.h"
22 #include "bridge_loop_avoidance.h"
23 #include "translation-table.h"
26 #include <linux/etherdevice.h>
27 #include <linux/crc16.h>
28 #include <linux/if_arp.h>
30 #include <linux/if_vlan.h>
32 static const uint8_t batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
34 static void batadv_bla_periodic_work(struct work_struct *work);
36 batadv_bla_send_announce(struct batadv_priv *bat_priv,
37 struct batadv_bla_backbone_gw *backbone_gw);
39 /* return the index of the claim */
40 static inline uint32_t batadv_choose_claim(const void *data, uint32_t size)
42 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
45 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
46 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
55 /* return the index of the backbone gateway */
56 static inline uint32_t batadv_choose_backbone_gw(const void *data,
59 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
62 hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr));
63 hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid));
72 /* compares address and vid of two backbone gws */
73 static int batadv_compare_backbone_gw(const struct hlist_node *node,
76 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
78 const struct batadv_bla_backbone_gw *gw1 = data1, *gw2 = data2;
80 if (!batadv_compare_eth(gw1->orig, gw2->orig))
83 if (gw1->vid != gw2->vid)
89 /* compares address and vid of two claims */
90 static int batadv_compare_claim(const struct hlist_node *node,
93 const void *data1 = container_of(node, struct batadv_bla_claim,
95 const struct batadv_bla_claim *cl1 = data1, *cl2 = data2;
97 if (!batadv_compare_eth(cl1->addr, cl2->addr))
100 if (cl1->vid != cl2->vid)
106 /* free a backbone gw */
108 batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
110 if (atomic_dec_and_test(&backbone_gw->refcount))
111 kfree_rcu(backbone_gw, rcu);
114 /* finally deinitialize the claim */
115 static void batadv_claim_free_rcu(struct rcu_head *rcu)
117 struct batadv_bla_claim *claim;
119 claim = container_of(rcu, struct batadv_bla_claim, rcu);
121 batadv_backbone_gw_free_ref(claim->backbone_gw);
125 /* free a claim, call claim_free_rcu if its the last reference */
126 static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
128 if (atomic_dec_and_test(&claim->refcount))
129 call_rcu(&claim->rcu, batadv_claim_free_rcu);
133 * batadv_claim_hash_find
134 * @bat_priv: the bat priv with all the soft interface information
135 * @data: search data (may be local/static data)
137 * looks for a claim in the hash, and returns it if found
140 static struct batadv_bla_claim
141 *batadv_claim_hash_find(struct batadv_priv *bat_priv,
142 struct batadv_bla_claim *data)
144 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
145 struct hlist_head *head;
146 struct batadv_bla_claim *claim;
147 struct batadv_bla_claim *claim_tmp = NULL;
153 index = batadv_choose_claim(data, hash->size);
154 head = &hash->table[index];
157 hlist_for_each_entry_rcu(claim, head, hash_entry) {
158 if (!batadv_compare_claim(&claim->hash_entry, data))
161 if (!atomic_inc_not_zero(&claim->refcount))
173 * batadv_backbone_hash_find - looks for a claim in the hash
174 * @bat_priv: the bat priv with all the soft interface information
175 * @addr: the address of the originator
178 * Returns claim if found or NULL otherwise.
180 static struct batadv_bla_backbone_gw *
181 batadv_backbone_hash_find(struct batadv_priv *bat_priv,
182 uint8_t *addr, unsigned short vid)
184 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
185 struct hlist_head *head;
186 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
187 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
193 ether_addr_copy(search_entry.orig, addr);
194 search_entry.vid = vid;
196 index = batadv_choose_backbone_gw(&search_entry, hash->size);
197 head = &hash->table[index];
200 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
201 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
205 if (!atomic_inc_not_zero(&backbone_gw->refcount))
208 backbone_gw_tmp = backbone_gw;
213 return backbone_gw_tmp;
216 /* delete all claims for a backbone */
218 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
220 struct batadv_hashtable *hash;
221 struct hlist_node *node_tmp;
222 struct hlist_head *head;
223 struct batadv_bla_claim *claim;
225 spinlock_t *list_lock; /* protects write access to the hash lists */
227 hash = backbone_gw->bat_priv->bla.claim_hash;
231 for (i = 0; i < hash->size; i++) {
232 head = &hash->table[i];
233 list_lock = &hash->list_locks[i];
235 spin_lock_bh(list_lock);
236 hlist_for_each_entry_safe(claim, node_tmp,
238 if (claim->backbone_gw != backbone_gw)
241 batadv_claim_free_ref(claim);
242 hlist_del_rcu(&claim->hash_entry);
244 spin_unlock_bh(list_lock);
247 /* all claims gone, initialize CRC */
248 backbone_gw->crc = BATADV_BLA_CRC_INIT;
252 * batadv_bla_send_claim - sends a claim frame according to the provided info
253 * @bat_priv: the bat priv with all the soft interface information
254 * @mac: the mac address to be announced within the claim
256 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
258 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, uint8_t *mac,
259 unsigned short vid, int claimtype)
262 struct ethhdr *ethhdr;
263 struct batadv_hard_iface *primary_if;
264 struct net_device *soft_iface;
266 struct batadv_bla_claim_dst local_claim_dest;
269 primary_if = batadv_primary_if_get_selected(bat_priv);
273 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
274 sizeof(local_claim_dest));
275 local_claim_dest.type = claimtype;
277 soft_iface = primary_if->soft_iface;
279 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
280 /* IP DST: 0.0.0.0 */
282 primary_if->soft_iface,
283 /* IP SRC: 0.0.0.0 */
285 /* Ethernet DST: Broadcast */
287 /* Ethernet SRC/HW SRC: originator mac */
288 primary_if->net_dev->dev_addr,
289 /* HW DST: FF:43:05:XX:YY:YY
290 * with XX = claim type
291 * and YY:YY = group id
293 (uint8_t *)&local_claim_dest);
298 ethhdr = (struct ethhdr *)skb->data;
299 hw_src = (uint8_t *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
301 /* now we pretend that the client would have sent this ... */
303 case BATADV_CLAIM_TYPE_CLAIM:
304 /* normal claim frame
305 * set Ethernet SRC to the clients mac
307 ether_addr_copy(ethhdr->h_source, mac);
308 batadv_dbg(BATADV_DBG_BLA, bat_priv,
309 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
310 BATADV_PRINT_VID(vid));
312 case BATADV_CLAIM_TYPE_UNCLAIM:
314 * set HW SRC to the clients mac
316 ether_addr_copy(hw_src, mac);
317 batadv_dbg(BATADV_DBG_BLA, bat_priv,
318 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
319 BATADV_PRINT_VID(vid));
321 case BATADV_CLAIM_TYPE_ANNOUNCE:
322 /* announcement frame
323 * set HW SRC to the special mac containg the crc
325 ether_addr_copy(hw_src, mac);
326 batadv_dbg(BATADV_DBG_BLA, bat_priv,
327 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
328 ethhdr->h_source, BATADV_PRINT_VID(vid));
330 case BATADV_CLAIM_TYPE_REQUEST:
332 * set HW SRC and header destination to the receiving backbone
335 ether_addr_copy(hw_src, mac);
336 ether_addr_copy(ethhdr->h_dest, mac);
337 batadv_dbg(BATADV_DBG_BLA, bat_priv,
338 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
339 ethhdr->h_source, ethhdr->h_dest,
340 BATADV_PRINT_VID(vid));
344 if (vid & BATADV_VLAN_HAS_TAG)
345 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
346 vid & VLAN_VID_MASK);
348 skb_reset_mac_header(skb);
349 skb->protocol = eth_type_trans(skb, soft_iface);
350 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
351 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
352 skb->len + ETH_HLEN);
353 soft_iface->last_rx = jiffies;
358 batadv_hardif_free_ref(primary_if);
362 * batadv_bla_get_backbone_gw
363 * @bat_priv: the bat priv with all the soft interface information
364 * @orig: the mac address of the originator
366 * @own_backbone: set if the requested backbone is local
368 * searches for the backbone gw or creates a new one if it could not
371 static struct batadv_bla_backbone_gw *
372 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, uint8_t *orig,
373 unsigned short vid, bool own_backbone)
375 struct batadv_bla_backbone_gw *entry;
376 struct batadv_orig_node *orig_node;
379 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
384 batadv_dbg(BATADV_DBG_BLA, bat_priv,
385 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
386 orig, BATADV_PRINT_VID(vid));
388 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
393 entry->lasttime = jiffies;
394 entry->crc = BATADV_BLA_CRC_INIT;
395 entry->bat_priv = bat_priv;
396 atomic_set(&entry->request_sent, 0);
397 atomic_set(&entry->wait_periods, 0);
398 ether_addr_copy(entry->orig, orig);
400 /* one for the hash, one for returning */
401 atomic_set(&entry->refcount, 2);
403 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
404 batadv_compare_backbone_gw,
405 batadv_choose_backbone_gw, entry,
408 if (unlikely(hash_added != 0)) {
409 /* hash failed, free the structure */
414 /* this is a gateway now, remove any TT entry on this VLAN */
415 orig_node = batadv_orig_hash_find(bat_priv, orig);
417 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
418 "became a backbone gateway");
419 batadv_orig_node_free_ref(orig_node);
423 batadv_bla_send_announce(bat_priv, entry);
425 /* this will be decreased in the worker thread */
426 atomic_inc(&entry->request_sent);
427 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
428 atomic_inc(&bat_priv->bla.num_requests);
434 /* update or add the own backbone gw to make sure we announce
435 * where we receive other backbone gws
438 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
439 struct batadv_hard_iface *primary_if,
442 struct batadv_bla_backbone_gw *backbone_gw;
444 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
445 primary_if->net_dev->dev_addr,
447 if (unlikely(!backbone_gw))
450 backbone_gw->lasttime = jiffies;
451 batadv_backbone_gw_free_ref(backbone_gw);
455 * batadv_bla_answer_request - answer a bla request by sending own claims
456 * @bat_priv: the bat priv with all the soft interface information
457 * @primary_if: interface where the request came on
458 * @vid: the vid where the request came on
460 * Repeat all of our own claims, and finally send an ANNOUNCE frame
461 * to allow the requester another check if the CRC is correct now.
463 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
464 struct batadv_hard_iface *primary_if,
467 struct hlist_head *head;
468 struct batadv_hashtable *hash;
469 struct batadv_bla_claim *claim;
470 struct batadv_bla_backbone_gw *backbone_gw;
473 batadv_dbg(BATADV_DBG_BLA, bat_priv,
474 "bla_answer_request(): received a claim request, send all of our own claims again\n");
476 backbone_gw = batadv_backbone_hash_find(bat_priv,
477 primary_if->net_dev->dev_addr,
482 hash = bat_priv->bla.claim_hash;
483 for (i = 0; i < hash->size; i++) {
484 head = &hash->table[i];
487 hlist_for_each_entry_rcu(claim, head, hash_entry) {
488 /* only own claims are interesting */
489 if (claim->backbone_gw != backbone_gw)
492 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
493 BATADV_CLAIM_TYPE_CLAIM);
498 /* finally, send an announcement frame */
499 batadv_bla_send_announce(bat_priv, backbone_gw);
500 batadv_backbone_gw_free_ref(backbone_gw);
504 * batadv_bla_send_request - send a request to repeat claims
505 * @backbone_gw: the backbone gateway from whom we are out of sync
507 * When the crc is wrong, ask the backbone gateway for a full table update.
508 * After the request, it will repeat all of his own claims and finally
509 * send an announcement claim with which we can check again.
511 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
513 /* first, remove all old entries */
514 batadv_bla_del_backbone_claims(backbone_gw);
516 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
517 "Sending REQUEST to %pM\n", backbone_gw->orig);
520 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
521 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
523 /* no local broadcasts should be sent or received, for now. */
524 if (!atomic_read(&backbone_gw->request_sent)) {
525 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
526 atomic_set(&backbone_gw->request_sent, 1);
531 * batadv_bla_send_announce
532 * @bat_priv: the bat priv with all the soft interface information
533 * @backbone_gw: our backbone gateway which should be announced
535 * This function sends an announcement. It is called from multiple
538 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
539 struct batadv_bla_backbone_gw *backbone_gw)
541 uint8_t mac[ETH_ALEN];
544 memcpy(mac, batadv_announce_mac, 4);
545 crc = htons(backbone_gw->crc);
546 memcpy(&mac[4], &crc, 2);
548 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
549 BATADV_CLAIM_TYPE_ANNOUNCE);
553 * batadv_bla_add_claim - Adds a claim in the claim hash
554 * @bat_priv: the bat priv with all the soft interface information
555 * @mac: the mac address of the claim
556 * @vid: the VLAN ID of the frame
557 * @backbone_gw: the backbone gateway which claims it
559 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
560 const uint8_t *mac, const unsigned short vid,
561 struct batadv_bla_backbone_gw *backbone_gw)
563 struct batadv_bla_claim *claim;
564 struct batadv_bla_claim search_claim;
567 ether_addr_copy(search_claim.addr, mac);
568 search_claim.vid = vid;
569 claim = batadv_claim_hash_find(bat_priv, &search_claim);
571 /* create a new claim entry if it does not exist yet. */
573 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
577 ether_addr_copy(claim->addr, mac);
579 claim->lasttime = jiffies;
580 claim->backbone_gw = backbone_gw;
582 atomic_set(&claim->refcount, 2);
583 batadv_dbg(BATADV_DBG_BLA, bat_priv,
584 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
585 mac, BATADV_PRINT_VID(vid));
586 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
587 batadv_compare_claim,
588 batadv_choose_claim, claim,
591 if (unlikely(hash_added != 0)) {
592 /* only local changes happened. */
597 claim->lasttime = jiffies;
598 if (claim->backbone_gw == backbone_gw)
599 /* no need to register a new backbone */
602 batadv_dbg(BATADV_DBG_BLA, bat_priv,
603 "bla_add_claim(): changing ownership for %pM, vid %d\n",
604 mac, BATADV_PRINT_VID(vid));
606 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
607 batadv_backbone_gw_free_ref(claim->backbone_gw);
609 /* set (new) backbone gw */
610 atomic_inc(&backbone_gw->refcount);
611 claim->backbone_gw = backbone_gw;
613 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
614 backbone_gw->lasttime = jiffies;
617 batadv_claim_free_ref(claim);
620 /* Delete a claim from the claim hash which has the
621 * given mac address and vid.
623 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
624 const uint8_t *mac, const unsigned short vid)
626 struct batadv_bla_claim search_claim, *claim;
628 ether_addr_copy(search_claim.addr, mac);
629 search_claim.vid = vid;
630 claim = batadv_claim_hash_find(bat_priv, &search_claim);
634 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
635 mac, BATADV_PRINT_VID(vid));
637 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
638 batadv_choose_claim, claim);
639 batadv_claim_free_ref(claim); /* reference from the hash is gone */
641 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
643 /* don't need the reference from hash_find() anymore */
644 batadv_claim_free_ref(claim);
647 /* check for ANNOUNCE frame, return 1 if handled */
648 static int batadv_handle_announce(struct batadv_priv *bat_priv,
649 uint8_t *an_addr, uint8_t *backbone_addr,
652 struct batadv_bla_backbone_gw *backbone_gw;
655 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
658 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
661 if (unlikely(!backbone_gw))
664 /* handle as ANNOUNCE frame */
665 backbone_gw->lasttime = jiffies;
666 crc = ntohs(*((__be16 *)(&an_addr[4])));
668 batadv_dbg(BATADV_DBG_BLA, bat_priv,
669 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
670 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
672 if (backbone_gw->crc != crc) {
673 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
674 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
676 BATADV_PRINT_VID(backbone_gw->vid),
677 backbone_gw->crc, crc);
679 batadv_bla_send_request(backbone_gw);
681 /* if we have sent a request and the crc was OK,
682 * we can allow traffic again.
684 if (atomic_read(&backbone_gw->request_sent)) {
685 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
686 atomic_set(&backbone_gw->request_sent, 0);
690 batadv_backbone_gw_free_ref(backbone_gw);
694 /* check for REQUEST frame, return 1 if handled */
695 static int batadv_handle_request(struct batadv_priv *bat_priv,
696 struct batadv_hard_iface *primary_if,
697 uint8_t *backbone_addr,
698 struct ethhdr *ethhdr, unsigned short vid)
700 /* check for REQUEST frame */
701 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
704 /* sanity check, this should not happen on a normal switch,
705 * we ignore it in this case.
707 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
710 batadv_dbg(BATADV_DBG_BLA, bat_priv,
711 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
712 BATADV_PRINT_VID(vid), ethhdr->h_source);
714 batadv_bla_answer_request(bat_priv, primary_if, vid);
718 /* check for UNCLAIM frame, return 1 if handled */
719 static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
720 struct batadv_hard_iface *primary_if,
721 uint8_t *backbone_addr,
722 uint8_t *claim_addr, unsigned short vid)
724 struct batadv_bla_backbone_gw *backbone_gw;
726 /* unclaim in any case if it is our own */
727 if (primary_if && batadv_compare_eth(backbone_addr,
728 primary_if->net_dev->dev_addr))
729 batadv_bla_send_claim(bat_priv, claim_addr, vid,
730 BATADV_CLAIM_TYPE_UNCLAIM);
732 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
737 /* this must be an UNCLAIM frame */
738 batadv_dbg(BATADV_DBG_BLA, bat_priv,
739 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
740 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
742 batadv_bla_del_claim(bat_priv, claim_addr, vid);
743 batadv_backbone_gw_free_ref(backbone_gw);
747 /* check for CLAIM frame, return 1 if handled */
748 static int batadv_handle_claim(struct batadv_priv *bat_priv,
749 struct batadv_hard_iface *primary_if,
750 uint8_t *backbone_addr, uint8_t *claim_addr,
753 struct batadv_bla_backbone_gw *backbone_gw;
755 /* register the gateway if not yet available, and add the claim. */
757 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
760 if (unlikely(!backbone_gw))
763 /* this must be a CLAIM frame */
764 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
765 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
766 batadv_bla_send_claim(bat_priv, claim_addr, vid,
767 BATADV_CLAIM_TYPE_CLAIM);
769 /* TODO: we could call something like tt_local_del() here. */
771 batadv_backbone_gw_free_ref(backbone_gw);
776 * batadv_check_claim_group
777 * @bat_priv: the bat priv with all the soft interface information
778 * @primary_if: the primary interface of this batman interface
779 * @hw_src: the Hardware source in the ARP Header
780 * @hw_dst: the Hardware destination in the ARP Header
781 * @ethhdr: pointer to the Ethernet header of the claim frame
783 * checks if it is a claim packet and if its on the same group.
784 * This function also applies the group ID of the sender
785 * if it is in the same mesh.
788 * 2 - if it is a claim packet and on the same group
789 * 1 - if is a claim packet from another group
790 * 0 - if it is not a claim packet
792 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
793 struct batadv_hard_iface *primary_if,
794 uint8_t *hw_src, uint8_t *hw_dst,
795 struct ethhdr *ethhdr)
797 uint8_t *backbone_addr;
798 struct batadv_orig_node *orig_node;
799 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
801 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
802 bla_dst_own = &bat_priv->bla.claim_dest;
804 /* if announcement packet, use the source,
805 * otherwise assume it is in the hw_src
807 switch (bla_dst->type) {
808 case BATADV_CLAIM_TYPE_CLAIM:
809 backbone_addr = hw_src;
811 case BATADV_CLAIM_TYPE_REQUEST:
812 case BATADV_CLAIM_TYPE_ANNOUNCE:
813 case BATADV_CLAIM_TYPE_UNCLAIM:
814 backbone_addr = ethhdr->h_source;
820 /* don't accept claim frames from ourselves */
821 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
824 /* if its already the same group, it is fine. */
825 if (bla_dst->group == bla_dst_own->group)
828 /* lets see if this originator is in our mesh */
829 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
831 /* dont accept claims from gateways which are not in
832 * the same mesh or group.
837 /* if our mesh friends mac is bigger, use it for ourselves. */
838 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
839 batadv_dbg(BATADV_DBG_BLA, bat_priv,
840 "taking other backbones claim group: %#.4x\n",
841 ntohs(bla_dst->group));
842 bla_dst_own->group = bla_dst->group;
845 batadv_orig_node_free_ref(orig_node);
851 * batadv_bla_process_claim
852 * @bat_priv: the bat priv with all the soft interface information
853 * @primary_if: the primary hard interface of this batman soft interface
854 * @skb: the frame to be checked
856 * Check if this is a claim frame, and process it accordingly.
858 * returns 1 if it was a claim frame, otherwise return 0 to
859 * tell the callee that it can use the frame on its own.
861 static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
862 struct batadv_hard_iface *primary_if,
865 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
866 uint8_t *hw_src, *hw_dst;
867 struct vlan_hdr *vhdr, vhdr_buf;
868 struct ethhdr *ethhdr;
869 struct arphdr *arphdr;
876 vid = batadv_get_vid(skb, 0);
877 ethhdr = eth_hdr(skb);
879 proto = ethhdr->h_proto;
881 if (vid & BATADV_VLAN_HAS_TAG) {
882 /* Traverse the VLAN/Ethertypes.
884 * At this point it is known that the first protocol is a VLAN
885 * header, so start checking at the encapsulated protocol.
887 * The depth of the VLAN headers is recorded to drop BLA claim
888 * frames encapsulated into multiple VLAN headers (QinQ).
891 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
896 proto = vhdr->h_vlan_encapsulated_proto;
897 headlen += VLAN_HLEN;
899 } while (proto == htons(ETH_P_8021Q));
902 if (proto != htons(ETH_P_ARP))
903 return 0; /* not a claim frame */
905 /* this must be a ARP frame. check if it is a claim. */
907 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
910 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
911 ethhdr = eth_hdr(skb);
912 arphdr = (struct arphdr *)((uint8_t *)ethhdr + headlen);
914 /* Check whether the ARP frame carries a valid
917 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
919 if (arphdr->ar_pro != htons(ETH_P_IP))
921 if (arphdr->ar_hln != ETH_ALEN)
923 if (arphdr->ar_pln != 4)
926 hw_src = (uint8_t *)arphdr + sizeof(struct arphdr);
927 hw_dst = hw_src + ETH_ALEN + 4;
928 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
929 bla_dst_own = &bat_priv->bla.claim_dest;
931 /* check if it is a claim frame in general */
932 if (memcmp(bla_dst->magic, bla_dst_own->magic,
933 sizeof(bla_dst->magic)) != 0)
936 /* check if there is a claim frame encapsulated deeper in (QinQ) and
937 * drop that, as this is not supported by BLA but should also not be
943 /* check if it is a claim frame. */
944 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
947 batadv_dbg(BATADV_DBG_BLA, bat_priv,
948 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
949 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
955 /* become a backbone gw ourselves on this vlan if not happened yet */
956 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
958 /* check for the different types of claim frames ... */
959 switch (bla_dst->type) {
960 case BATADV_CLAIM_TYPE_CLAIM:
961 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
962 ethhdr->h_source, vid))
965 case BATADV_CLAIM_TYPE_UNCLAIM:
966 if (batadv_handle_unclaim(bat_priv, primary_if,
967 ethhdr->h_source, hw_src, vid))
971 case BATADV_CLAIM_TYPE_ANNOUNCE:
972 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
976 case BATADV_CLAIM_TYPE_REQUEST:
977 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
983 batadv_dbg(BATADV_DBG_BLA, bat_priv,
984 "bla_process_claim(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
985 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
989 /* Check when we last heard from other nodes, and remove them in case of
990 * a time out, or clean all backbone gws if now is set.
992 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
994 struct batadv_bla_backbone_gw *backbone_gw;
995 struct hlist_node *node_tmp;
996 struct hlist_head *head;
997 struct batadv_hashtable *hash;
998 spinlock_t *list_lock; /* protects write access to the hash lists */
1001 hash = bat_priv->bla.backbone_hash;
1005 for (i = 0; i < hash->size; i++) {
1006 head = &hash->table[i];
1007 list_lock = &hash->list_locks[i];
1009 spin_lock_bh(list_lock);
1010 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1014 if (!batadv_has_timed_out(backbone_gw->lasttime,
1015 BATADV_BLA_BACKBONE_TIMEOUT))
1018 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1019 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1023 /* don't wait for the pending request anymore */
1024 if (atomic_read(&backbone_gw->request_sent))
1025 atomic_dec(&bat_priv->bla.num_requests);
1027 batadv_bla_del_backbone_claims(backbone_gw);
1029 hlist_del_rcu(&backbone_gw->hash_entry);
1030 batadv_backbone_gw_free_ref(backbone_gw);
1032 spin_unlock_bh(list_lock);
1037 * batadv_bla_purge_claims
1038 * @bat_priv: the bat priv with all the soft interface information
1039 * @primary_if: the selected primary interface, may be NULL if now is set
1040 * @now: whether the whole hash shall be wiped now
1042 * Check when we heard last time from our own claims, and remove them in case of
1043 * a time out, or clean all claims if now is set
1045 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1046 struct batadv_hard_iface *primary_if,
1049 struct batadv_bla_claim *claim;
1050 struct hlist_head *head;
1051 struct batadv_hashtable *hash;
1054 hash = bat_priv->bla.claim_hash;
1058 for (i = 0; i < hash->size; i++) {
1059 head = &hash->table[i];
1062 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1065 if (!batadv_compare_eth(claim->backbone_gw->orig,
1066 primary_if->net_dev->dev_addr))
1068 if (!batadv_has_timed_out(claim->lasttime,
1069 BATADV_BLA_CLAIM_TIMEOUT))
1072 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1073 "bla_purge_claims(): %pM, vid %d, time out\n",
1074 claim->addr, claim->vid);
1077 batadv_handle_unclaim(bat_priv, primary_if,
1078 claim->backbone_gw->orig,
1079 claim->addr, claim->vid);
1086 * batadv_bla_update_orig_address
1087 * @bat_priv: the bat priv with all the soft interface information
1088 * @primary_if: the new selected primary_if
1089 * @oldif: the old primary interface, may be NULL
1091 * Update the backbone gateways when the own orig address changes.
1093 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1094 struct batadv_hard_iface *primary_if,
1095 struct batadv_hard_iface *oldif)
1097 struct batadv_bla_backbone_gw *backbone_gw;
1098 struct hlist_head *head;
1099 struct batadv_hashtable *hash;
1103 /* reset bridge loop avoidance group id */
1104 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1105 bat_priv->bla.claim_dest.group = group;
1107 /* purge everything when bridge loop avoidance is turned off */
1108 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1112 batadv_bla_purge_claims(bat_priv, NULL, 1);
1113 batadv_bla_purge_backbone_gw(bat_priv, 1);
1117 hash = bat_priv->bla.backbone_hash;
1121 for (i = 0; i < hash->size; i++) {
1122 head = &hash->table[i];
1125 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1126 /* own orig still holds the old value. */
1127 if (!batadv_compare_eth(backbone_gw->orig,
1128 oldif->net_dev->dev_addr))
1131 ether_addr_copy(backbone_gw->orig,
1132 primary_if->net_dev->dev_addr);
1133 /* send an announce frame so others will ask for our
1134 * claims and update their tables.
1136 batadv_bla_send_announce(bat_priv, backbone_gw);
1142 /* periodic work to do:
1143 * * purge structures when they are too old
1144 * * send announcements
1146 static void batadv_bla_periodic_work(struct work_struct *work)
1148 struct delayed_work *delayed_work;
1149 struct batadv_priv *bat_priv;
1150 struct batadv_priv_bla *priv_bla;
1151 struct hlist_head *head;
1152 struct batadv_bla_backbone_gw *backbone_gw;
1153 struct batadv_hashtable *hash;
1154 struct batadv_hard_iface *primary_if;
1157 delayed_work = container_of(work, struct delayed_work, work);
1158 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1159 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1160 primary_if = batadv_primary_if_get_selected(bat_priv);
1164 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1165 batadv_bla_purge_backbone_gw(bat_priv, 0);
1167 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1170 hash = bat_priv->bla.backbone_hash;
1174 for (i = 0; i < hash->size; i++) {
1175 head = &hash->table[i];
1178 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1179 if (!batadv_compare_eth(backbone_gw->orig,
1180 primary_if->net_dev->dev_addr))
1183 backbone_gw->lasttime = jiffies;
1185 batadv_bla_send_announce(bat_priv, backbone_gw);
1187 /* request_sent is only set after creation to avoid
1188 * problems when we are not yet known as backbone gw
1191 * We can reset this now after we waited some periods
1192 * to give bridge forward delays and bla group forming
1196 if (atomic_read(&backbone_gw->request_sent) == 0)
1199 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1202 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1203 atomic_set(&backbone_gw->request_sent, 0);
1209 batadv_hardif_free_ref(primary_if);
1211 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1212 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1215 /* The hash for claim and backbone hash receive the same key because they
1216 * are getting initialized by hash_new with the same key. Reinitializing
1217 * them with to different keys to allow nested locking without generating
1220 static struct lock_class_key batadv_claim_hash_lock_class_key;
1221 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1223 /* initialize all bla structures */
1224 int batadv_bla_init(struct batadv_priv *bat_priv)
1227 uint8_t claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1228 struct batadv_hard_iface *primary_if;
1230 unsigned long entrytime;
1232 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1234 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1236 /* setting claim destination address */
1237 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1238 bat_priv->bla.claim_dest.type = 0;
1239 primary_if = batadv_primary_if_get_selected(bat_priv);
1241 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1242 bat_priv->bla.claim_dest.group = htons(crc);
1243 batadv_hardif_free_ref(primary_if);
1245 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1248 /* initialize the duplicate list */
1249 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1250 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1251 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1252 bat_priv->bla.bcast_duplist_curr = 0;
1254 if (bat_priv->bla.claim_hash)
1257 bat_priv->bla.claim_hash = batadv_hash_new(128);
1258 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1260 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1263 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1264 &batadv_claim_hash_lock_class_key);
1265 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1266 &batadv_backbone_hash_lock_class_key);
1268 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1270 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1272 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1273 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1278 * batadv_bla_check_bcast_duplist
1279 * @bat_priv: the bat priv with all the soft interface information
1280 * @skb: contains the bcast_packet to be checked
1282 * check if it is on our broadcast list. Another gateway might
1283 * have sent the same packet because it is connected to the same backbone,
1284 * so we have to remove this duplicate.
1286 * This is performed by checking the CRC, which will tell us
1287 * with a good chance that it is the same packet. If it is furthermore
1288 * sent by another host, drop it. We allow equal packets from
1289 * the same host however as this might be intended.
1291 int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1292 struct sk_buff *skb)
1294 int i, curr, ret = 0;
1296 struct batadv_bcast_packet *bcast_packet;
1297 struct batadv_bcast_duplist_entry *entry;
1299 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1301 /* calculate the crc ... */
1302 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1304 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1306 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1307 curr = (bat_priv->bla.bcast_duplist_curr + i);
1308 curr %= BATADV_DUPLIST_SIZE;
1309 entry = &bat_priv->bla.bcast_duplist[curr];
1311 /* we can stop searching if the entry is too old ;
1312 * later entries will be even older
1314 if (batadv_has_timed_out(entry->entrytime,
1315 BATADV_DUPLIST_TIMEOUT))
1318 if (entry->crc != crc)
1321 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1324 /* this entry seems to match: same crc, not too old,
1325 * and from another gw. therefore return 1 to forbid it.
1330 /* not found, add a new entry (overwrite the oldest entry)
1331 * and allow it, its the first occurrence.
1333 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1334 curr %= BATADV_DUPLIST_SIZE;
1335 entry = &bat_priv->bla.bcast_duplist[curr];
1337 entry->entrytime = jiffies;
1338 ether_addr_copy(entry->orig, bcast_packet->orig);
1339 bat_priv->bla.bcast_duplist_curr = curr;
1342 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1348 * batadv_bla_is_backbone_gw_orig
1349 * @bat_priv: the bat priv with all the soft interface information
1350 * @orig: originator mac address
1351 * @vid: VLAN identifier
1353 * Check if the originator is a gateway for the VLAN identified by vid.
1355 * Returns true if orig is a backbone for this vid, false otherwise.
1357 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig,
1360 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1361 struct hlist_head *head;
1362 struct batadv_bla_backbone_gw *backbone_gw;
1365 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1371 for (i = 0; i < hash->size; i++) {
1372 head = &hash->table[i];
1375 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1376 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1377 backbone_gw->vid == vid) {
1389 * batadv_bla_is_backbone_gw
1390 * @skb: the frame to be checked
1391 * @orig_node: the orig_node of the frame
1392 * @hdr_size: maximum length of the frame
1394 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1395 * if the orig_node is also a gateway on the soft interface, otherwise it
1398 int batadv_bla_is_backbone_gw(struct sk_buff *skb,
1399 struct batadv_orig_node *orig_node, int hdr_size)
1401 struct batadv_bla_backbone_gw *backbone_gw;
1404 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1407 /* first, find out the vid. */
1408 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1411 vid = batadv_get_vid(skb, hdr_size);
1413 /* see if this originator is a backbone gw for this VLAN */
1414 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1415 orig_node->orig, vid);
1419 batadv_backbone_gw_free_ref(backbone_gw);
1423 /* free all bla structures (for softinterface free or module unload) */
1424 void batadv_bla_free(struct batadv_priv *bat_priv)
1426 struct batadv_hard_iface *primary_if;
1428 cancel_delayed_work_sync(&bat_priv->bla.work);
1429 primary_if = batadv_primary_if_get_selected(bat_priv);
1431 if (bat_priv->bla.claim_hash) {
1432 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1433 batadv_hash_destroy(bat_priv->bla.claim_hash);
1434 bat_priv->bla.claim_hash = NULL;
1436 if (bat_priv->bla.backbone_hash) {
1437 batadv_bla_purge_backbone_gw(bat_priv, 1);
1438 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1439 bat_priv->bla.backbone_hash = NULL;
1442 batadv_hardif_free_ref(primary_if);
1447 * @bat_priv: the bat priv with all the soft interface information
1448 * @skb: the frame to be checked
1449 * @vid: the VLAN ID of the frame
1450 * @is_bcast: the packet came in a broadcast packet type.
1452 * bla_rx avoidance checks if:
1453 * * we have to race for a claim
1454 * * if the frame is allowed on the LAN
1456 * in these cases, the skb is further handled by this function and
1457 * returns 1, otherwise it returns 0 and the caller shall further
1460 int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1461 unsigned short vid, bool is_bcast)
1463 struct ethhdr *ethhdr;
1464 struct batadv_bla_claim search_claim, *claim = NULL;
1465 struct batadv_hard_iface *primary_if;
1468 ethhdr = eth_hdr(skb);
1470 primary_if = batadv_primary_if_get_selected(bat_priv);
1474 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1477 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1478 /* don't allow broadcasts while requests are in flight */
1479 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1482 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1483 search_claim.vid = vid;
1484 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1487 /* possible optimization: race for a claim */
1488 /* No claim exists yet, claim it for us!
1490 batadv_handle_claim(bat_priv, primary_if,
1491 primary_if->net_dev->dev_addr,
1492 ethhdr->h_source, vid);
1496 /* if it is our own claim ... */
1497 if (batadv_compare_eth(claim->backbone_gw->orig,
1498 primary_if->net_dev->dev_addr)) {
1499 /* ... allow it in any case */
1500 claim->lasttime = jiffies;
1504 /* if it is a broadcast ... */
1505 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1506 /* ... drop it. the responsible gateway is in charge.
1508 * We need to check is_bcast because with the gateway
1509 * feature, broadcasts (like DHCP requests) may be sent
1510 * using a unicast packet type.
1514 /* seems the client considers us as its best gateway.
1515 * send a claim and update the claim table
1518 batadv_handle_claim(bat_priv, primary_if,
1519 primary_if->net_dev->dev_addr,
1520 ethhdr->h_source, vid);
1524 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1534 batadv_hardif_free_ref(primary_if);
1536 batadv_claim_free_ref(claim);
1542 * @bat_priv: the bat priv with all the soft interface information
1543 * @skb: the frame to be checked
1544 * @vid: the VLAN ID of the frame
1547 * * a claim was received which has to be processed
1548 * * the frame is allowed on the mesh
1550 * in these cases, the skb is further handled by this function and
1551 * returns 1, otherwise it returns 0 and the caller shall further
1554 * This call might reallocate skb data.
1556 int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1559 struct ethhdr *ethhdr;
1560 struct batadv_bla_claim search_claim, *claim = NULL;
1561 struct batadv_hard_iface *primary_if;
1564 primary_if = batadv_primary_if_get_selected(bat_priv);
1568 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1571 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1574 ethhdr = eth_hdr(skb);
1576 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1577 /* don't allow broadcasts while requests are in flight */
1578 if (is_multicast_ether_addr(ethhdr->h_dest))
1581 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1582 search_claim.vid = vid;
1584 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1586 /* if no claim exists, allow it. */
1590 /* check if we are responsible. */
1591 if (batadv_compare_eth(claim->backbone_gw->orig,
1592 primary_if->net_dev->dev_addr)) {
1593 /* if yes, the client has roamed and we have
1596 batadv_handle_unclaim(bat_priv, primary_if,
1597 primary_if->net_dev->dev_addr,
1598 ethhdr->h_source, vid);
1602 /* check if it is a multicast/broadcast frame */
1603 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1604 /* drop it. the responsible gateway has forwarded it into
1605 * the backbone network.
1609 /* we must allow it. at least if we are
1610 * responsible for the DESTINATION.
1615 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1622 batadv_hardif_free_ref(primary_if);
1624 batadv_claim_free_ref(claim);
1628 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
1630 struct net_device *net_dev = (struct net_device *)seq->private;
1631 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1632 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
1633 struct batadv_bla_claim *claim;
1634 struct batadv_hard_iface *primary_if;
1635 struct hlist_head *head;
1638 uint8_t *primary_addr;
1640 primary_if = batadv_seq_print_text_primary_if_get(seq);
1644 primary_addr = primary_if->net_dev->dev_addr;
1646 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1647 net_dev->name, primary_addr,
1648 ntohs(bat_priv->bla.claim_dest.group));
1649 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
1650 "Client", "VID", "Originator", "CRC");
1651 for (i = 0; i < hash->size; i++) {
1652 head = &hash->table[i];
1655 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1656 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1658 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
1659 claim->addr, BATADV_PRINT_VID(claim->vid),
1660 claim->backbone_gw->orig,
1661 (is_own ? 'x' : ' '),
1662 claim->backbone_gw->crc);
1668 batadv_hardif_free_ref(primary_if);
1672 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1674 struct net_device *net_dev = (struct net_device *)seq->private;
1675 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1676 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1677 struct batadv_bla_backbone_gw *backbone_gw;
1678 struct batadv_hard_iface *primary_if;
1679 struct hlist_head *head;
1683 uint8_t *primary_addr;
1685 primary_if = batadv_seq_print_text_primary_if_get(seq);
1689 primary_addr = primary_if->net_dev->dev_addr;
1691 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
1692 net_dev->name, primary_addr,
1693 ntohs(bat_priv->bla.claim_dest.group));
1694 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
1695 "Originator", "VID", "last seen", "CRC");
1696 for (i = 0; i < hash->size; i++) {
1697 head = &hash->table[i];
1700 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1701 msecs = jiffies_to_msecs(jiffies -
1702 backbone_gw->lasttime);
1703 secs = msecs / 1000;
1704 msecs = msecs % 1000;
1706 is_own = batadv_compare_eth(backbone_gw->orig,
1711 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
1713 BATADV_PRINT_VID(backbone_gw->vid), secs,
1714 msecs, backbone_gw->crc);
1720 batadv_hardif_free_ref(primary_if);