1 /* Copyright (C) 2011-2015 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/>.
18 #include "bridge_loop_avoidance.h"
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/compiler.h>
24 #include <linux/crc16.h>
25 #include <linux/errno.h>
26 #include <linux/etherdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_vlan.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/skbuff.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/stddef.h>
44 #include <linux/string.h>
45 #include <linux/workqueue.h>
48 #include "hard-interface.h"
50 #include "originator.h"
52 #include "translation-table.h"
54 static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
56 static void batadv_bla_periodic_work(struct work_struct *work);
58 batadv_bla_send_announce(struct batadv_priv *bat_priv,
59 struct batadv_bla_backbone_gw *backbone_gw);
61 /* return the index of the claim */
62 static inline u32 batadv_choose_claim(const void *data, u32 size)
64 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
67 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
68 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
73 /* return the index of the backbone gateway */
74 static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
76 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
79 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
80 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
85 /* compares address and vid of two backbone gws */
86 static int batadv_compare_backbone_gw(const struct hlist_node *node,
89 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
91 const struct batadv_bla_backbone_gw *gw1 = data1;
92 const struct batadv_bla_backbone_gw *gw2 = data2;
94 if (!batadv_compare_eth(gw1->orig, gw2->orig))
97 if (gw1->vid != gw2->vid)
103 /* compares address and vid of two claims */
104 static int batadv_compare_claim(const struct hlist_node *node,
107 const void *data1 = container_of(node, struct batadv_bla_claim,
109 const struct batadv_bla_claim *cl1 = data1;
110 const struct batadv_bla_claim *cl2 = data2;
112 if (!batadv_compare_eth(cl1->addr, cl2->addr))
115 if (cl1->vid != cl2->vid)
121 /* free a backbone gw */
123 batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw *backbone_gw)
125 if (atomic_dec_and_test(&backbone_gw->refcount))
126 kfree_rcu(backbone_gw, rcu);
129 /* finally deinitialize the claim */
130 static void batadv_claim_release(struct batadv_bla_claim *claim)
132 batadv_backbone_gw_free_ref(claim->backbone_gw);
133 kfree_rcu(claim, rcu);
136 /* free a claim, call claim_free_rcu if its the last reference */
137 static void batadv_claim_free_ref(struct batadv_bla_claim *claim)
139 if (atomic_dec_and_test(&claim->refcount))
140 batadv_claim_release(claim);
144 * batadv_claim_hash_find
145 * @bat_priv: the bat priv with all the soft interface information
146 * @data: search data (may be local/static data)
148 * looks for a claim in the hash, and returns it if found
151 static struct batadv_bla_claim
152 *batadv_claim_hash_find(struct batadv_priv *bat_priv,
153 struct batadv_bla_claim *data)
155 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
156 struct hlist_head *head;
157 struct batadv_bla_claim *claim;
158 struct batadv_bla_claim *claim_tmp = NULL;
164 index = batadv_choose_claim(data, hash->size);
165 head = &hash->table[index];
168 hlist_for_each_entry_rcu(claim, head, hash_entry) {
169 if (!batadv_compare_claim(&claim->hash_entry, data))
172 if (!atomic_inc_not_zero(&claim->refcount))
184 * batadv_backbone_hash_find - looks for a claim in the hash
185 * @bat_priv: the bat priv with all the soft interface information
186 * @addr: the address of the originator
189 * Returns claim if found or NULL otherwise.
191 static struct batadv_bla_backbone_gw *
192 batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
195 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
196 struct hlist_head *head;
197 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
198 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
204 ether_addr_copy(search_entry.orig, addr);
205 search_entry.vid = vid;
207 index = batadv_choose_backbone_gw(&search_entry, hash->size);
208 head = &hash->table[index];
211 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
212 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
216 if (!atomic_inc_not_zero(&backbone_gw->refcount))
219 backbone_gw_tmp = backbone_gw;
224 return backbone_gw_tmp;
227 /* delete all claims for a backbone */
229 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
231 struct batadv_hashtable *hash;
232 struct hlist_node *node_tmp;
233 struct hlist_head *head;
234 struct batadv_bla_claim *claim;
236 spinlock_t *list_lock; /* protects write access to the hash lists */
238 hash = backbone_gw->bat_priv->bla.claim_hash;
242 for (i = 0; i < hash->size; i++) {
243 head = &hash->table[i];
244 list_lock = &hash->list_locks[i];
246 spin_lock_bh(list_lock);
247 hlist_for_each_entry_safe(claim, node_tmp,
249 if (claim->backbone_gw != backbone_gw)
252 batadv_claim_free_ref(claim);
253 hlist_del_rcu(&claim->hash_entry);
255 spin_unlock_bh(list_lock);
258 /* all claims gone, initialize CRC */
259 spin_lock_bh(&backbone_gw->crc_lock);
260 backbone_gw->crc = BATADV_BLA_CRC_INIT;
261 spin_unlock_bh(&backbone_gw->crc_lock);
265 * batadv_bla_send_claim - sends a claim frame according to the provided info
266 * @bat_priv: the bat priv with all the soft interface information
267 * @mac: the mac address to be announced within the claim
269 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
271 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
272 unsigned short vid, int claimtype)
275 struct ethhdr *ethhdr;
276 struct batadv_hard_iface *primary_if;
277 struct net_device *soft_iface;
279 struct batadv_bla_claim_dst local_claim_dest;
282 primary_if = batadv_primary_if_get_selected(bat_priv);
286 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
287 sizeof(local_claim_dest));
288 local_claim_dest.type = claimtype;
290 soft_iface = primary_if->soft_iface;
292 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
293 /* IP DST: 0.0.0.0 */
295 primary_if->soft_iface,
296 /* IP SRC: 0.0.0.0 */
298 /* Ethernet DST: Broadcast */
300 /* Ethernet SRC/HW SRC: originator mac */
301 primary_if->net_dev->dev_addr,
302 /* HW DST: FF:43:05:XX:YY:YY
303 * with XX = claim type
304 * and YY:YY = group id
306 (u8 *)&local_claim_dest);
311 ethhdr = (struct ethhdr *)skb->data;
312 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
314 /* now we pretend that the client would have sent this ... */
316 case BATADV_CLAIM_TYPE_CLAIM:
317 /* normal claim frame
318 * set Ethernet SRC to the clients mac
320 ether_addr_copy(ethhdr->h_source, mac);
321 batadv_dbg(BATADV_DBG_BLA, bat_priv,
322 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
323 BATADV_PRINT_VID(vid));
325 case BATADV_CLAIM_TYPE_UNCLAIM:
327 * set HW SRC to the clients mac
329 ether_addr_copy(hw_src, mac);
330 batadv_dbg(BATADV_DBG_BLA, bat_priv,
331 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
332 BATADV_PRINT_VID(vid));
334 case BATADV_CLAIM_TYPE_ANNOUNCE:
335 /* announcement frame
336 * set HW SRC to the special mac containg the crc
338 ether_addr_copy(hw_src, mac);
339 batadv_dbg(BATADV_DBG_BLA, bat_priv,
340 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
341 ethhdr->h_source, BATADV_PRINT_VID(vid));
343 case BATADV_CLAIM_TYPE_REQUEST:
345 * set HW SRC and header destination to the receiving backbone
348 ether_addr_copy(hw_src, mac);
349 ether_addr_copy(ethhdr->h_dest, mac);
350 batadv_dbg(BATADV_DBG_BLA, bat_priv,
351 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
352 ethhdr->h_source, ethhdr->h_dest,
353 BATADV_PRINT_VID(vid));
357 if (vid & BATADV_VLAN_HAS_TAG)
358 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
359 vid & VLAN_VID_MASK);
361 skb_reset_mac_header(skb);
362 skb->protocol = eth_type_trans(skb, soft_iface);
363 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
364 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
365 skb->len + ETH_HLEN);
366 soft_iface->last_rx = jiffies;
371 batadv_hardif_free_ref(primary_if);
375 * batadv_bla_get_backbone_gw
376 * @bat_priv: the bat priv with all the soft interface information
377 * @orig: the mac address of the originator
379 * @own_backbone: set if the requested backbone is local
381 * searches for the backbone gw or creates a new one if it could not
384 static struct batadv_bla_backbone_gw *
385 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
386 unsigned short vid, bool own_backbone)
388 struct batadv_bla_backbone_gw *entry;
389 struct batadv_orig_node *orig_node;
392 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
397 batadv_dbg(BATADV_DBG_BLA, bat_priv,
398 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
399 orig, BATADV_PRINT_VID(vid));
401 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
406 entry->lasttime = jiffies;
407 entry->crc = BATADV_BLA_CRC_INIT;
408 entry->bat_priv = bat_priv;
409 spin_lock_init(&entry->crc_lock);
410 atomic_set(&entry->request_sent, 0);
411 atomic_set(&entry->wait_periods, 0);
412 ether_addr_copy(entry->orig, orig);
414 /* one for the hash, one for returning */
415 atomic_set(&entry->refcount, 2);
417 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
418 batadv_compare_backbone_gw,
419 batadv_choose_backbone_gw, entry,
422 if (unlikely(hash_added != 0)) {
423 /* hash failed, free the structure */
428 /* this is a gateway now, remove any TT entry on this VLAN */
429 orig_node = batadv_orig_hash_find(bat_priv, orig);
431 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
432 "became a backbone gateway");
433 batadv_orig_node_free_ref(orig_node);
437 batadv_bla_send_announce(bat_priv, entry);
439 /* this will be decreased in the worker thread */
440 atomic_inc(&entry->request_sent);
441 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
442 atomic_inc(&bat_priv->bla.num_requests);
448 /* update or add the own backbone gw to make sure we announce
449 * where we receive other backbone gws
452 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
453 struct batadv_hard_iface *primary_if,
456 struct batadv_bla_backbone_gw *backbone_gw;
458 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
459 primary_if->net_dev->dev_addr,
461 if (unlikely(!backbone_gw))
464 backbone_gw->lasttime = jiffies;
465 batadv_backbone_gw_free_ref(backbone_gw);
469 * batadv_bla_answer_request - answer a bla request by sending own claims
470 * @bat_priv: the bat priv with all the soft interface information
471 * @primary_if: interface where the request came on
472 * @vid: the vid where the request came on
474 * Repeat all of our own claims, and finally send an ANNOUNCE frame
475 * to allow the requester another check if the CRC is correct now.
477 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
478 struct batadv_hard_iface *primary_if,
481 struct hlist_head *head;
482 struct batadv_hashtable *hash;
483 struct batadv_bla_claim *claim;
484 struct batadv_bla_backbone_gw *backbone_gw;
487 batadv_dbg(BATADV_DBG_BLA, bat_priv,
488 "bla_answer_request(): received a claim request, send all of our own claims again\n");
490 backbone_gw = batadv_backbone_hash_find(bat_priv,
491 primary_if->net_dev->dev_addr,
496 hash = bat_priv->bla.claim_hash;
497 for (i = 0; i < hash->size; i++) {
498 head = &hash->table[i];
501 hlist_for_each_entry_rcu(claim, head, hash_entry) {
502 /* only own claims are interesting */
503 if (claim->backbone_gw != backbone_gw)
506 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
507 BATADV_CLAIM_TYPE_CLAIM);
512 /* finally, send an announcement frame */
513 batadv_bla_send_announce(bat_priv, backbone_gw);
514 batadv_backbone_gw_free_ref(backbone_gw);
518 * batadv_bla_send_request - send a request to repeat claims
519 * @backbone_gw: the backbone gateway from whom we are out of sync
521 * When the crc is wrong, ask the backbone gateway for a full table update.
522 * After the request, it will repeat all of his own claims and finally
523 * send an announcement claim with which we can check again.
525 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
527 /* first, remove all old entries */
528 batadv_bla_del_backbone_claims(backbone_gw);
530 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
531 "Sending REQUEST to %pM\n", backbone_gw->orig);
534 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
535 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
537 /* no local broadcasts should be sent or received, for now. */
538 if (!atomic_read(&backbone_gw->request_sent)) {
539 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
540 atomic_set(&backbone_gw->request_sent, 1);
545 * batadv_bla_send_announce
546 * @bat_priv: the bat priv with all the soft interface information
547 * @backbone_gw: our backbone gateway which should be announced
549 * This function sends an announcement. It is called from multiple
552 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
553 struct batadv_bla_backbone_gw *backbone_gw)
558 memcpy(mac, batadv_announce_mac, 4);
559 spin_lock_bh(&backbone_gw->crc_lock);
560 crc = htons(backbone_gw->crc);
561 spin_unlock_bh(&backbone_gw->crc_lock);
562 memcpy(&mac[4], &crc, 2);
564 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
565 BATADV_CLAIM_TYPE_ANNOUNCE);
569 * batadv_bla_add_claim - Adds a claim in the claim hash
570 * @bat_priv: the bat priv with all the soft interface information
571 * @mac: the mac address of the claim
572 * @vid: the VLAN ID of the frame
573 * @backbone_gw: the backbone gateway which claims it
575 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
576 const u8 *mac, const unsigned short vid,
577 struct batadv_bla_backbone_gw *backbone_gw)
579 struct batadv_bla_claim *claim;
580 struct batadv_bla_claim search_claim;
583 ether_addr_copy(search_claim.addr, mac);
584 search_claim.vid = vid;
585 claim = batadv_claim_hash_find(bat_priv, &search_claim);
587 /* create a new claim entry if it does not exist yet. */
589 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
593 ether_addr_copy(claim->addr, mac);
595 claim->lasttime = jiffies;
596 claim->backbone_gw = backbone_gw;
598 atomic_set(&claim->refcount, 2);
599 batadv_dbg(BATADV_DBG_BLA, bat_priv,
600 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
601 mac, BATADV_PRINT_VID(vid));
602 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
603 batadv_compare_claim,
604 batadv_choose_claim, claim,
607 if (unlikely(hash_added != 0)) {
608 /* only local changes happened. */
613 claim->lasttime = jiffies;
614 if (claim->backbone_gw == backbone_gw)
615 /* no need to register a new backbone */
618 batadv_dbg(BATADV_DBG_BLA, bat_priv,
619 "bla_add_claim(): changing ownership for %pM, vid %d\n",
620 mac, BATADV_PRINT_VID(vid));
622 spin_lock_bh(&claim->backbone_gw->crc_lock);
623 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
624 spin_unlock_bh(&claim->backbone_gw->crc_lock);
625 batadv_backbone_gw_free_ref(claim->backbone_gw);
627 /* set (new) backbone gw */
628 atomic_inc(&backbone_gw->refcount);
629 claim->backbone_gw = backbone_gw;
631 spin_lock_bh(&backbone_gw->crc_lock);
632 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
633 spin_unlock_bh(&backbone_gw->crc_lock);
634 backbone_gw->lasttime = jiffies;
637 batadv_claim_free_ref(claim);
640 /* Delete a claim from the claim hash which has the
641 * given mac address and vid.
643 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
644 const u8 *mac, const unsigned short vid)
646 struct batadv_bla_claim search_claim, *claim;
648 ether_addr_copy(search_claim.addr, mac);
649 search_claim.vid = vid;
650 claim = batadv_claim_hash_find(bat_priv, &search_claim);
654 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
655 mac, BATADV_PRINT_VID(vid));
657 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
658 batadv_choose_claim, claim);
659 batadv_claim_free_ref(claim); /* reference from the hash is gone */
661 spin_lock_bh(&claim->backbone_gw->crc_lock);
662 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
663 spin_unlock_bh(&claim->backbone_gw->crc_lock);
665 /* don't need the reference from hash_find() anymore */
666 batadv_claim_free_ref(claim);
669 /* check for ANNOUNCE frame, return 1 if handled */
670 static int batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
671 u8 *backbone_addr, unsigned short vid)
673 struct batadv_bla_backbone_gw *backbone_gw;
674 u16 backbone_crc, crc;
676 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
679 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
682 if (unlikely(!backbone_gw))
685 /* handle as ANNOUNCE frame */
686 backbone_gw->lasttime = jiffies;
687 crc = ntohs(*((__be16 *)(&an_addr[4])));
689 batadv_dbg(BATADV_DBG_BLA, bat_priv,
690 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
691 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
693 spin_lock_bh(&backbone_gw->crc_lock);
694 backbone_crc = backbone_gw->crc;
695 spin_unlock_bh(&backbone_gw->crc_lock);
697 if (backbone_crc != crc) {
698 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
699 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
701 BATADV_PRINT_VID(backbone_gw->vid),
704 batadv_bla_send_request(backbone_gw);
706 /* if we have sent a request and the crc was OK,
707 * we can allow traffic again.
709 if (atomic_read(&backbone_gw->request_sent)) {
710 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
711 atomic_set(&backbone_gw->request_sent, 0);
715 batadv_backbone_gw_free_ref(backbone_gw);
719 /* check for REQUEST frame, return 1 if handled */
720 static int batadv_handle_request(struct batadv_priv *bat_priv,
721 struct batadv_hard_iface *primary_if,
722 u8 *backbone_addr, struct ethhdr *ethhdr,
725 /* check for REQUEST frame */
726 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
729 /* sanity check, this should not happen on a normal switch,
730 * we ignore it in this case.
732 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
735 batadv_dbg(BATADV_DBG_BLA, bat_priv,
736 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
737 BATADV_PRINT_VID(vid), ethhdr->h_source);
739 batadv_bla_answer_request(bat_priv, primary_if, vid);
743 /* check for UNCLAIM frame, return 1 if handled */
744 static int batadv_handle_unclaim(struct batadv_priv *bat_priv,
745 struct batadv_hard_iface *primary_if,
746 u8 *backbone_addr, u8 *claim_addr,
749 struct batadv_bla_backbone_gw *backbone_gw;
751 /* unclaim in any case if it is our own */
752 if (primary_if && batadv_compare_eth(backbone_addr,
753 primary_if->net_dev->dev_addr))
754 batadv_bla_send_claim(bat_priv, claim_addr, vid,
755 BATADV_CLAIM_TYPE_UNCLAIM);
757 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
762 /* this must be an UNCLAIM frame */
763 batadv_dbg(BATADV_DBG_BLA, bat_priv,
764 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
765 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
767 batadv_bla_del_claim(bat_priv, claim_addr, vid);
768 batadv_backbone_gw_free_ref(backbone_gw);
772 /* check for CLAIM frame, return 1 if handled */
773 static int batadv_handle_claim(struct batadv_priv *bat_priv,
774 struct batadv_hard_iface *primary_if,
775 u8 *backbone_addr, u8 *claim_addr,
778 struct batadv_bla_backbone_gw *backbone_gw;
780 /* register the gateway if not yet available, and add the claim. */
782 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
785 if (unlikely(!backbone_gw))
788 /* this must be a CLAIM frame */
789 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
790 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
791 batadv_bla_send_claim(bat_priv, claim_addr, vid,
792 BATADV_CLAIM_TYPE_CLAIM);
794 /* TODO: we could call something like tt_local_del() here. */
796 batadv_backbone_gw_free_ref(backbone_gw);
801 * batadv_check_claim_group
802 * @bat_priv: the bat priv with all the soft interface information
803 * @primary_if: the primary interface of this batman interface
804 * @hw_src: the Hardware source in the ARP Header
805 * @hw_dst: the Hardware destination in the ARP Header
806 * @ethhdr: pointer to the Ethernet header of the claim frame
808 * checks if it is a claim packet and if its on the same group.
809 * This function also applies the group ID of the sender
810 * if it is in the same mesh.
813 * 2 - if it is a claim packet and on the same group
814 * 1 - if is a claim packet from another group
815 * 0 - if it is not a claim packet
817 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
818 struct batadv_hard_iface *primary_if,
819 u8 *hw_src, u8 *hw_dst,
820 struct ethhdr *ethhdr)
823 struct batadv_orig_node *orig_node;
824 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
826 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
827 bla_dst_own = &bat_priv->bla.claim_dest;
829 /* if announcement packet, use the source,
830 * otherwise assume it is in the hw_src
832 switch (bla_dst->type) {
833 case BATADV_CLAIM_TYPE_CLAIM:
834 backbone_addr = hw_src;
836 case BATADV_CLAIM_TYPE_REQUEST:
837 case BATADV_CLAIM_TYPE_ANNOUNCE:
838 case BATADV_CLAIM_TYPE_UNCLAIM:
839 backbone_addr = ethhdr->h_source;
845 /* don't accept claim frames from ourselves */
846 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
849 /* if its already the same group, it is fine. */
850 if (bla_dst->group == bla_dst_own->group)
853 /* lets see if this originator is in our mesh */
854 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
856 /* dont accept claims from gateways which are not in
857 * the same mesh or group.
862 /* if our mesh friends mac is bigger, use it for ourselves. */
863 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
864 batadv_dbg(BATADV_DBG_BLA, bat_priv,
865 "taking other backbones claim group: %#.4x\n",
866 ntohs(bla_dst->group));
867 bla_dst_own->group = bla_dst->group;
870 batadv_orig_node_free_ref(orig_node);
876 * batadv_bla_process_claim
877 * @bat_priv: the bat priv with all the soft interface information
878 * @primary_if: the primary hard interface of this batman soft interface
879 * @skb: the frame to be checked
881 * Check if this is a claim frame, and process it accordingly.
883 * returns 1 if it was a claim frame, otherwise return 0 to
884 * tell the callee that it can use the frame on its own.
886 static int batadv_bla_process_claim(struct batadv_priv *bat_priv,
887 struct batadv_hard_iface *primary_if,
890 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
892 struct vlan_hdr *vhdr, vhdr_buf;
893 struct ethhdr *ethhdr;
894 struct arphdr *arphdr;
901 vid = batadv_get_vid(skb, 0);
902 ethhdr = eth_hdr(skb);
904 proto = ethhdr->h_proto;
906 if (vid & BATADV_VLAN_HAS_TAG) {
907 /* Traverse the VLAN/Ethertypes.
909 * At this point it is known that the first protocol is a VLAN
910 * header, so start checking at the encapsulated protocol.
912 * The depth of the VLAN headers is recorded to drop BLA claim
913 * frames encapsulated into multiple VLAN headers (QinQ).
916 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
921 proto = vhdr->h_vlan_encapsulated_proto;
922 headlen += VLAN_HLEN;
924 } while (proto == htons(ETH_P_8021Q));
927 if (proto != htons(ETH_P_ARP))
928 return 0; /* not a claim frame */
930 /* this must be a ARP frame. check if it is a claim. */
932 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
935 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
936 ethhdr = eth_hdr(skb);
937 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
939 /* Check whether the ARP frame carries a valid
942 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
944 if (arphdr->ar_pro != htons(ETH_P_IP))
946 if (arphdr->ar_hln != ETH_ALEN)
948 if (arphdr->ar_pln != 4)
951 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
952 hw_dst = hw_src + ETH_ALEN + 4;
953 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
954 bla_dst_own = &bat_priv->bla.claim_dest;
956 /* check if it is a claim frame in general */
957 if (memcmp(bla_dst->magic, bla_dst_own->magic,
958 sizeof(bla_dst->magic)) != 0)
961 /* check if there is a claim frame encapsulated deeper in (QinQ) and
962 * drop that, as this is not supported by BLA but should also not be
968 /* check if it is a claim frame. */
969 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
972 batadv_dbg(BATADV_DBG_BLA, bat_priv,
973 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
974 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
980 /* become a backbone gw ourselves on this vlan if not happened yet */
981 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
983 /* check for the different types of claim frames ... */
984 switch (bla_dst->type) {
985 case BATADV_CLAIM_TYPE_CLAIM:
986 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
987 ethhdr->h_source, vid))
990 case BATADV_CLAIM_TYPE_UNCLAIM:
991 if (batadv_handle_unclaim(bat_priv, primary_if,
992 ethhdr->h_source, hw_src, vid))
996 case BATADV_CLAIM_TYPE_ANNOUNCE:
997 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1001 case BATADV_CLAIM_TYPE_REQUEST:
1002 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1008 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1009 "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",
1010 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
1014 /* Check when we last heard from other nodes, and remove them in case of
1015 * a time out, or clean all backbone gws if now is set.
1017 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1019 struct batadv_bla_backbone_gw *backbone_gw;
1020 struct hlist_node *node_tmp;
1021 struct hlist_head *head;
1022 struct batadv_hashtable *hash;
1023 spinlock_t *list_lock; /* protects write access to the hash lists */
1026 hash = bat_priv->bla.backbone_hash;
1030 for (i = 0; i < hash->size; i++) {
1031 head = &hash->table[i];
1032 list_lock = &hash->list_locks[i];
1034 spin_lock_bh(list_lock);
1035 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1039 if (!batadv_has_timed_out(backbone_gw->lasttime,
1040 BATADV_BLA_BACKBONE_TIMEOUT))
1043 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1044 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1048 /* don't wait for the pending request anymore */
1049 if (atomic_read(&backbone_gw->request_sent))
1050 atomic_dec(&bat_priv->bla.num_requests);
1052 batadv_bla_del_backbone_claims(backbone_gw);
1054 hlist_del_rcu(&backbone_gw->hash_entry);
1055 batadv_backbone_gw_free_ref(backbone_gw);
1057 spin_unlock_bh(list_lock);
1062 * batadv_bla_purge_claims
1063 * @bat_priv: the bat priv with all the soft interface information
1064 * @primary_if: the selected primary interface, may be NULL if now is set
1065 * @now: whether the whole hash shall be wiped now
1067 * Check when we heard last time from our own claims, and remove them in case of
1068 * a time out, or clean all claims if now is set
1070 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1071 struct batadv_hard_iface *primary_if,
1074 struct batadv_bla_claim *claim;
1075 struct hlist_head *head;
1076 struct batadv_hashtable *hash;
1079 hash = bat_priv->bla.claim_hash;
1083 for (i = 0; i < hash->size; i++) {
1084 head = &hash->table[i];
1087 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1090 if (!batadv_compare_eth(claim->backbone_gw->orig,
1091 primary_if->net_dev->dev_addr))
1093 if (!batadv_has_timed_out(claim->lasttime,
1094 BATADV_BLA_CLAIM_TIMEOUT))
1097 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1098 "bla_purge_claims(): %pM, vid %d, time out\n",
1099 claim->addr, claim->vid);
1102 batadv_handle_unclaim(bat_priv, primary_if,
1103 claim->backbone_gw->orig,
1104 claim->addr, claim->vid);
1111 * batadv_bla_update_orig_address
1112 * @bat_priv: the bat priv with all the soft interface information
1113 * @primary_if: the new selected primary_if
1114 * @oldif: the old primary interface, may be NULL
1116 * Update the backbone gateways when the own orig address changes.
1118 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1119 struct batadv_hard_iface *primary_if,
1120 struct batadv_hard_iface *oldif)
1122 struct batadv_bla_backbone_gw *backbone_gw;
1123 struct hlist_head *head;
1124 struct batadv_hashtable *hash;
1128 /* reset bridge loop avoidance group id */
1129 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1130 bat_priv->bla.claim_dest.group = group;
1132 /* purge everything when bridge loop avoidance is turned off */
1133 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1137 batadv_bla_purge_claims(bat_priv, NULL, 1);
1138 batadv_bla_purge_backbone_gw(bat_priv, 1);
1142 hash = bat_priv->bla.backbone_hash;
1146 for (i = 0; i < hash->size; i++) {
1147 head = &hash->table[i];
1150 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1151 /* own orig still holds the old value. */
1152 if (!batadv_compare_eth(backbone_gw->orig,
1153 oldif->net_dev->dev_addr))
1156 ether_addr_copy(backbone_gw->orig,
1157 primary_if->net_dev->dev_addr);
1158 /* send an announce frame so others will ask for our
1159 * claims and update their tables.
1161 batadv_bla_send_announce(bat_priv, backbone_gw);
1168 * batadv_bla_status_update - purge bla interfaces if necessary
1169 * @net_dev: the soft interface net device
1171 void batadv_bla_status_update(struct net_device *net_dev)
1173 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1174 struct batadv_hard_iface *primary_if;
1176 primary_if = batadv_primary_if_get_selected(bat_priv);
1180 /* this function already purges everything when bla is disabled,
1181 * so just call that one.
1183 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1184 batadv_hardif_free_ref(primary_if);
1187 /* periodic work to do:
1188 * * purge structures when they are too old
1189 * * send announcements
1191 static void batadv_bla_periodic_work(struct work_struct *work)
1193 struct delayed_work *delayed_work;
1194 struct batadv_priv *bat_priv;
1195 struct batadv_priv_bla *priv_bla;
1196 struct hlist_head *head;
1197 struct batadv_bla_backbone_gw *backbone_gw;
1198 struct batadv_hashtable *hash;
1199 struct batadv_hard_iface *primary_if;
1202 delayed_work = container_of(work, struct delayed_work, work);
1203 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1204 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1205 primary_if = batadv_primary_if_get_selected(bat_priv);
1209 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1210 batadv_bla_purge_backbone_gw(bat_priv, 0);
1212 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1215 hash = bat_priv->bla.backbone_hash;
1219 for (i = 0; i < hash->size; i++) {
1220 head = &hash->table[i];
1223 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1224 if (!batadv_compare_eth(backbone_gw->orig,
1225 primary_if->net_dev->dev_addr))
1228 backbone_gw->lasttime = jiffies;
1230 batadv_bla_send_announce(bat_priv, backbone_gw);
1232 /* request_sent is only set after creation to avoid
1233 * problems when we are not yet known as backbone gw
1236 * We can reset this now after we waited some periods
1237 * to give bridge forward delays and bla group forming
1241 if (atomic_read(&backbone_gw->request_sent) == 0)
1244 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1247 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1248 atomic_set(&backbone_gw->request_sent, 0);
1254 batadv_hardif_free_ref(primary_if);
1256 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1257 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1260 /* The hash for claim and backbone hash receive the same key because they
1261 * are getting initialized by hash_new with the same key. Reinitializing
1262 * them with to different keys to allow nested locking without generating
1265 static struct lock_class_key batadv_claim_hash_lock_class_key;
1266 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1268 /* initialize all bla structures */
1269 int batadv_bla_init(struct batadv_priv *bat_priv)
1272 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1273 struct batadv_hard_iface *primary_if;
1275 unsigned long entrytime;
1277 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1279 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1281 /* setting claim destination address */
1282 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1283 bat_priv->bla.claim_dest.type = 0;
1284 primary_if = batadv_primary_if_get_selected(bat_priv);
1286 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1287 bat_priv->bla.claim_dest.group = htons(crc);
1288 batadv_hardif_free_ref(primary_if);
1290 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1293 /* initialize the duplicate list */
1294 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1295 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1296 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1297 bat_priv->bla.bcast_duplist_curr = 0;
1299 if (bat_priv->bla.claim_hash)
1302 bat_priv->bla.claim_hash = batadv_hash_new(128);
1303 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1305 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1308 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1309 &batadv_claim_hash_lock_class_key);
1310 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1311 &batadv_backbone_hash_lock_class_key);
1313 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1315 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1317 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1318 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1323 * batadv_bla_check_bcast_duplist
1324 * @bat_priv: the bat priv with all the soft interface information
1325 * @skb: contains the bcast_packet to be checked
1327 * check if it is on our broadcast list. Another gateway might
1328 * have sent the same packet because it is connected to the same backbone,
1329 * so we have to remove this duplicate.
1331 * This is performed by checking the CRC, which will tell us
1332 * with a good chance that it is the same packet. If it is furthermore
1333 * sent by another host, drop it. We allow equal packets from
1334 * the same host however as this might be intended.
1336 int batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1337 struct sk_buff *skb)
1339 int i, curr, ret = 0;
1341 struct batadv_bcast_packet *bcast_packet;
1342 struct batadv_bcast_duplist_entry *entry;
1344 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1346 /* calculate the crc ... */
1347 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1349 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1351 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1352 curr = (bat_priv->bla.bcast_duplist_curr + i);
1353 curr %= BATADV_DUPLIST_SIZE;
1354 entry = &bat_priv->bla.bcast_duplist[curr];
1356 /* we can stop searching if the entry is too old ;
1357 * later entries will be even older
1359 if (batadv_has_timed_out(entry->entrytime,
1360 BATADV_DUPLIST_TIMEOUT))
1363 if (entry->crc != crc)
1366 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1369 /* this entry seems to match: same crc, not too old,
1370 * and from another gw. therefore return 1 to forbid it.
1375 /* not found, add a new entry (overwrite the oldest entry)
1376 * and allow it, its the first occurrence.
1378 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1379 curr %= BATADV_DUPLIST_SIZE;
1380 entry = &bat_priv->bla.bcast_duplist[curr];
1382 entry->entrytime = jiffies;
1383 ether_addr_copy(entry->orig, bcast_packet->orig);
1384 bat_priv->bla.bcast_duplist_curr = curr;
1387 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1393 * batadv_bla_is_backbone_gw_orig
1394 * @bat_priv: the bat priv with all the soft interface information
1395 * @orig: originator mac address
1396 * @vid: VLAN identifier
1398 * Check if the originator is a gateway for the VLAN identified by vid.
1400 * Returns true if orig is a backbone for this vid, false otherwise.
1402 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1405 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1406 struct hlist_head *head;
1407 struct batadv_bla_backbone_gw *backbone_gw;
1410 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1416 for (i = 0; i < hash->size; i++) {
1417 head = &hash->table[i];
1420 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1421 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1422 backbone_gw->vid == vid) {
1434 * batadv_bla_is_backbone_gw
1435 * @skb: the frame to be checked
1436 * @orig_node: the orig_node of the frame
1437 * @hdr_size: maximum length of the frame
1439 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1440 * if the orig_node is also a gateway on the soft interface, otherwise it
1443 int batadv_bla_is_backbone_gw(struct sk_buff *skb,
1444 struct batadv_orig_node *orig_node, int hdr_size)
1446 struct batadv_bla_backbone_gw *backbone_gw;
1449 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1452 /* first, find out the vid. */
1453 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1456 vid = batadv_get_vid(skb, hdr_size);
1458 /* see if this originator is a backbone gw for this VLAN */
1459 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1460 orig_node->orig, vid);
1464 batadv_backbone_gw_free_ref(backbone_gw);
1468 /* free all bla structures (for softinterface free or module unload) */
1469 void batadv_bla_free(struct batadv_priv *bat_priv)
1471 struct batadv_hard_iface *primary_if;
1473 cancel_delayed_work_sync(&bat_priv->bla.work);
1474 primary_if = batadv_primary_if_get_selected(bat_priv);
1476 if (bat_priv->bla.claim_hash) {
1477 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1478 batadv_hash_destroy(bat_priv->bla.claim_hash);
1479 bat_priv->bla.claim_hash = NULL;
1481 if (bat_priv->bla.backbone_hash) {
1482 batadv_bla_purge_backbone_gw(bat_priv, 1);
1483 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1484 bat_priv->bla.backbone_hash = NULL;
1487 batadv_hardif_free_ref(primary_if);
1492 * @bat_priv: the bat priv with all the soft interface information
1493 * @skb: the frame to be checked
1494 * @vid: the VLAN ID of the frame
1495 * @is_bcast: the packet came in a broadcast packet type.
1497 * bla_rx avoidance checks if:
1498 * * we have to race for a claim
1499 * * if the frame is allowed on the LAN
1501 * in these cases, the skb is further handled by this function and
1502 * returns 1, otherwise it returns 0 and the caller shall further
1505 int batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1506 unsigned short vid, bool is_bcast)
1508 struct ethhdr *ethhdr;
1509 struct batadv_bla_claim search_claim, *claim = NULL;
1510 struct batadv_hard_iface *primary_if;
1513 ethhdr = eth_hdr(skb);
1515 primary_if = batadv_primary_if_get_selected(bat_priv);
1519 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1522 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1523 /* don't allow broadcasts while requests are in flight */
1524 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1527 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1528 search_claim.vid = vid;
1529 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1532 /* possible optimization: race for a claim */
1533 /* No claim exists yet, claim it for us!
1535 batadv_handle_claim(bat_priv, primary_if,
1536 primary_if->net_dev->dev_addr,
1537 ethhdr->h_source, vid);
1541 /* if it is our own claim ... */
1542 if (batadv_compare_eth(claim->backbone_gw->orig,
1543 primary_if->net_dev->dev_addr)) {
1544 /* ... allow it in any case */
1545 claim->lasttime = jiffies;
1549 /* if it is a broadcast ... */
1550 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1551 /* ... drop it. the responsible gateway is in charge.
1553 * We need to check is_bcast because with the gateway
1554 * feature, broadcasts (like DHCP requests) may be sent
1555 * using a unicast packet type.
1559 /* seems the client considers us as its best gateway.
1560 * send a claim and update the claim table
1563 batadv_handle_claim(bat_priv, primary_if,
1564 primary_if->net_dev->dev_addr,
1565 ethhdr->h_source, vid);
1569 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1579 batadv_hardif_free_ref(primary_if);
1581 batadv_claim_free_ref(claim);
1587 * @bat_priv: the bat priv with all the soft interface information
1588 * @skb: the frame to be checked
1589 * @vid: the VLAN ID of the frame
1592 * * a claim was received which has to be processed
1593 * * the frame is allowed on the mesh
1595 * in these cases, the skb is further handled by this function and
1596 * returns 1, otherwise it returns 0 and the caller shall further
1599 * This call might reallocate skb data.
1601 int batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1604 struct ethhdr *ethhdr;
1605 struct batadv_bla_claim search_claim, *claim = NULL;
1606 struct batadv_hard_iface *primary_if;
1609 primary_if = batadv_primary_if_get_selected(bat_priv);
1613 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1616 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1619 ethhdr = eth_hdr(skb);
1621 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1622 /* don't allow broadcasts while requests are in flight */
1623 if (is_multicast_ether_addr(ethhdr->h_dest))
1626 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1627 search_claim.vid = vid;
1629 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1631 /* if no claim exists, allow it. */
1635 /* check if we are responsible. */
1636 if (batadv_compare_eth(claim->backbone_gw->orig,
1637 primary_if->net_dev->dev_addr)) {
1638 /* if yes, the client has roamed and we have
1641 batadv_handle_unclaim(bat_priv, primary_if,
1642 primary_if->net_dev->dev_addr,
1643 ethhdr->h_source, vid);
1647 /* check if it is a multicast/broadcast frame */
1648 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1649 /* drop it. the responsible gateway has forwarded it into
1650 * the backbone network.
1654 /* we must allow it. at least if we are
1655 * responsible for the DESTINATION.
1660 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1667 batadv_hardif_free_ref(primary_if);
1669 batadv_claim_free_ref(claim);
1673 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
1675 struct net_device *net_dev = (struct net_device *)seq->private;
1676 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1677 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
1678 struct batadv_bla_claim *claim;
1679 struct batadv_hard_iface *primary_if;
1680 struct hlist_head *head;
1686 primary_if = batadv_seq_print_text_primary_if_get(seq);
1690 primary_addr = primary_if->net_dev->dev_addr;
1692 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1693 net_dev->name, primary_addr,
1694 ntohs(bat_priv->bla.claim_dest.group));
1695 seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n",
1696 "Client", "VID", "Originator", "CRC");
1697 for (i = 0; i < hash->size; i++) {
1698 head = &hash->table[i];
1701 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1702 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1705 spin_lock_bh(&claim->backbone_gw->crc_lock);
1706 backbone_crc = claim->backbone_gw->crc;
1707 spin_unlock_bh(&claim->backbone_gw->crc_lock);
1708 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
1709 claim->addr, BATADV_PRINT_VID(claim->vid),
1710 claim->backbone_gw->orig,
1711 (is_own ? 'x' : ' '),
1718 batadv_hardif_free_ref(primary_if);
1722 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1724 struct net_device *net_dev = (struct net_device *)seq->private;
1725 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1726 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1727 struct batadv_bla_backbone_gw *backbone_gw;
1728 struct batadv_hard_iface *primary_if;
1729 struct hlist_head *head;
1736 primary_if = batadv_seq_print_text_primary_if_get(seq);
1740 primary_addr = primary_if->net_dev->dev_addr;
1742 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
1743 net_dev->name, primary_addr,
1744 ntohs(bat_priv->bla.claim_dest.group));
1745 seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n",
1746 "Originator", "VID", "last seen", "CRC");
1747 for (i = 0; i < hash->size; i++) {
1748 head = &hash->table[i];
1751 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1752 msecs = jiffies_to_msecs(jiffies -
1753 backbone_gw->lasttime);
1754 secs = msecs / 1000;
1755 msecs = msecs % 1000;
1757 is_own = batadv_compare_eth(backbone_gw->orig,
1762 spin_lock_bh(&backbone_gw->crc_lock);
1763 backbone_crc = backbone_gw->crc;
1764 spin_unlock_bh(&backbone_gw->crc_lock);
1766 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
1768 BATADV_PRINT_VID(backbone_gw->vid), secs,
1769 msecs, backbone_crc);
1775 batadv_hardif_free_ref(primary_if);