1 /* Copyright (C) 2011-2016 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/kref.h>
35 #include <linux/list.h>
36 #include <linux/lockdep.h>
37 #include <linux/netdevice.h>
38 #include <linux/rculist.h>
39 #include <linux/rcupdate.h>
40 #include <linux/seq_file.h>
41 #include <linux/skbuff.h>
42 #include <linux/slab.h>
43 #include <linux/spinlock.h>
44 #include <linux/stddef.h>
45 #include <linux/string.h>
46 #include <linux/workqueue.h>
49 #include "hard-interface.h"
51 #include "originator.h"
54 #include "translation-table.h"
56 static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
58 static void batadv_bla_periodic_work(struct work_struct *work);
60 batadv_bla_send_announce(struct batadv_priv *bat_priv,
61 struct batadv_bla_backbone_gw *backbone_gw);
64 * batadv_choose_claim - choose the right bucket for a claim.
66 * @size: size of the hash table
68 * Return: the hash index of the claim
70 static inline u32 batadv_choose_claim(const void *data, u32 size)
72 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
75 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
76 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
82 * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway.
84 * @size: size of the hash table
86 * Return: the hash index of the backbone gateway
88 static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
90 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
93 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
94 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
100 * batadv_compare_backbone_gw - compare address and vid of two backbone gws
101 * @node: list node of the first entry to compare
102 * @data2: pointer to the second backbone gateway
104 * Return: true if the backbones have the same data, false otherwise
106 static bool batadv_compare_backbone_gw(const struct hlist_node *node,
109 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
111 const struct batadv_bla_backbone_gw *gw1 = data1;
112 const struct batadv_bla_backbone_gw *gw2 = data2;
114 if (!batadv_compare_eth(gw1->orig, gw2->orig))
117 if (gw1->vid != gw2->vid)
124 * batadv_compare_claim - compare address and vid of two claims
125 * @node: list node of the first entry to compare
126 * @data2: pointer to the second claims
128 * Return: true if the claim have the same data, 0 otherwise
130 static bool batadv_compare_claim(const struct hlist_node *node,
133 const void *data1 = container_of(node, struct batadv_bla_claim,
135 const struct batadv_bla_claim *cl1 = data1;
136 const struct batadv_bla_claim *cl2 = data2;
138 if (!batadv_compare_eth(cl1->addr, cl2->addr))
141 if (cl1->vid != cl2->vid)
148 * batadv_backbone_gw_release - release backbone gw from lists and queue for
149 * free after rcu grace period
150 * @ref: kref pointer of the backbone gw
152 static void batadv_backbone_gw_release(struct kref *ref)
154 struct batadv_bla_backbone_gw *backbone_gw;
156 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
159 kfree_rcu(backbone_gw, rcu);
163 * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly
165 * @backbone_gw: backbone gateway to be free'd
167 static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
169 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
173 * batadv_claim_release - release claim from lists and queue for free after rcu
175 * @ref: kref pointer of the claim
177 static void batadv_claim_release(struct kref *ref)
179 struct batadv_bla_claim *claim;
181 claim = container_of(ref, struct batadv_bla_claim, refcount);
183 batadv_backbone_gw_put(claim->backbone_gw);
184 kfree_rcu(claim, rcu);
188 * batadv_claim_put - decrement the claim refcounter and possibly
190 * @claim: claim to be free'd
192 static void batadv_claim_put(struct batadv_bla_claim *claim)
194 kref_put(&claim->refcount, batadv_claim_release);
198 * batadv_claim_hash_find - looks for a claim in the claim hash
199 * @bat_priv: the bat priv with all the soft interface information
200 * @data: search data (may be local/static data)
202 * Return: claim if found or NULL otherwise.
204 static struct batadv_bla_claim *
205 batadv_claim_hash_find(struct batadv_priv *bat_priv,
206 struct batadv_bla_claim *data)
208 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
209 struct hlist_head *head;
210 struct batadv_bla_claim *claim;
211 struct batadv_bla_claim *claim_tmp = NULL;
217 index = batadv_choose_claim(data, hash->size);
218 head = &hash->table[index];
221 hlist_for_each_entry_rcu(claim, head, hash_entry) {
222 if (!batadv_compare_claim(&claim->hash_entry, data))
225 if (!kref_get_unless_zero(&claim->refcount))
237 * batadv_backbone_hash_find - looks for a backbone gateway in the hash
238 * @bat_priv: the bat priv with all the soft interface information
239 * @addr: the address of the originator
242 * Return: backbone gateway if found or NULL otherwise
244 static struct batadv_bla_backbone_gw *
245 batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
248 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
249 struct hlist_head *head;
250 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
251 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
257 ether_addr_copy(search_entry.orig, addr);
258 search_entry.vid = vid;
260 index = batadv_choose_backbone_gw(&search_entry, hash->size);
261 head = &hash->table[index];
264 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
265 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
269 if (!kref_get_unless_zero(&backbone_gw->refcount))
272 backbone_gw_tmp = backbone_gw;
277 return backbone_gw_tmp;
281 * batadv_bla_del_backbone_claims - delete all claims for a backbone
282 * @backbone_gw: backbone gateway where the claims should be removed
285 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
287 struct batadv_hashtable *hash;
288 struct hlist_node *node_tmp;
289 struct hlist_head *head;
290 struct batadv_bla_claim *claim;
292 spinlock_t *list_lock; /* protects write access to the hash lists */
294 hash = backbone_gw->bat_priv->bla.claim_hash;
298 for (i = 0; i < hash->size; i++) {
299 head = &hash->table[i];
300 list_lock = &hash->list_locks[i];
302 spin_lock_bh(list_lock);
303 hlist_for_each_entry_safe(claim, node_tmp,
305 if (claim->backbone_gw != backbone_gw)
308 batadv_claim_put(claim);
309 hlist_del_rcu(&claim->hash_entry);
311 spin_unlock_bh(list_lock);
314 /* all claims gone, initialize CRC */
315 spin_lock_bh(&backbone_gw->crc_lock);
316 backbone_gw->crc = BATADV_BLA_CRC_INIT;
317 spin_unlock_bh(&backbone_gw->crc_lock);
321 * batadv_bla_send_claim - sends a claim frame according to the provided info
322 * @bat_priv: the bat priv with all the soft interface information
323 * @mac: the mac address to be announced within the claim
325 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
327 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
328 unsigned short vid, int claimtype)
331 struct ethhdr *ethhdr;
332 struct batadv_hard_iface *primary_if;
333 struct net_device *soft_iface;
335 struct batadv_bla_claim_dst local_claim_dest;
338 primary_if = batadv_primary_if_get_selected(bat_priv);
342 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
343 sizeof(local_claim_dest));
344 local_claim_dest.type = claimtype;
346 soft_iface = primary_if->soft_iface;
348 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
349 /* IP DST: 0.0.0.0 */
351 primary_if->soft_iface,
352 /* IP SRC: 0.0.0.0 */
354 /* Ethernet DST: Broadcast */
356 /* Ethernet SRC/HW SRC: originator mac */
357 primary_if->net_dev->dev_addr,
358 /* HW DST: FF:43:05:XX:YY:YY
359 * with XX = claim type
360 * and YY:YY = group id
362 (u8 *)&local_claim_dest);
367 ethhdr = (struct ethhdr *)skb->data;
368 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
370 /* now we pretend that the client would have sent this ... */
372 case BATADV_CLAIM_TYPE_CLAIM:
373 /* normal claim frame
374 * set Ethernet SRC to the clients mac
376 ether_addr_copy(ethhdr->h_source, mac);
377 batadv_dbg(BATADV_DBG_BLA, bat_priv,
378 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
379 BATADV_PRINT_VID(vid));
381 case BATADV_CLAIM_TYPE_UNCLAIM:
383 * set HW SRC to the clients mac
385 ether_addr_copy(hw_src, mac);
386 batadv_dbg(BATADV_DBG_BLA, bat_priv,
387 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
388 BATADV_PRINT_VID(vid));
390 case BATADV_CLAIM_TYPE_ANNOUNCE:
391 /* announcement frame
392 * set HW SRC to the special mac containg the crc
394 ether_addr_copy(hw_src, mac);
395 batadv_dbg(BATADV_DBG_BLA, bat_priv,
396 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
397 ethhdr->h_source, BATADV_PRINT_VID(vid));
399 case BATADV_CLAIM_TYPE_REQUEST:
401 * set HW SRC and header destination to the receiving backbone
404 ether_addr_copy(hw_src, mac);
405 ether_addr_copy(ethhdr->h_dest, mac);
406 batadv_dbg(BATADV_DBG_BLA, bat_priv,
407 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
408 ethhdr->h_source, ethhdr->h_dest,
409 BATADV_PRINT_VID(vid));
411 case BATADV_CLAIM_TYPE_LOOPDETECT:
412 ether_addr_copy(ethhdr->h_source, mac);
413 batadv_dbg(BATADV_DBG_BLA, bat_priv,
414 "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n",
415 ethhdr->h_source, ethhdr->h_dest,
416 BATADV_PRINT_VID(vid));
421 if (vid & BATADV_VLAN_HAS_TAG)
422 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
423 vid & VLAN_VID_MASK);
425 skb_reset_mac_header(skb);
426 skb->protocol = eth_type_trans(skb, soft_iface);
427 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
428 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
429 skb->len + ETH_HLEN);
430 soft_iface->last_rx = jiffies;
435 batadv_hardif_put(primary_if);
439 * batadv_bla_loopdetect_report - worker for reporting the loop
440 * @work: work queue item
442 * Throws an uevent, as the loopdetect check function can't do that itself
443 * since the kernel may sleep while throwing uevents.
445 static void batadv_bla_loopdetect_report(struct work_struct *work)
447 struct batadv_bla_backbone_gw *backbone_gw;
448 struct batadv_priv *bat_priv;
449 char vid_str[6] = { '\0' };
451 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
453 bat_priv = backbone_gw->bat_priv;
455 batadv_info(bat_priv->soft_iface,
456 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
457 BATADV_PRINT_VID(backbone_gw->vid));
458 snprintf(vid_str, sizeof(vid_str), "%d",
459 BATADV_PRINT_VID(backbone_gw->vid));
460 vid_str[sizeof(vid_str) - 1] = 0;
462 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
465 batadv_backbone_gw_put(backbone_gw);
469 * batadv_bla_get_backbone_gw - finds or creates a backbone gateway
470 * @bat_priv: the bat priv with all the soft interface information
471 * @orig: the mac address of the originator
473 * @own_backbone: set if the requested backbone is local
475 * Return: the (possibly created) backbone gateway or NULL on error
477 static struct batadv_bla_backbone_gw *
478 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
479 unsigned short vid, bool own_backbone)
481 struct batadv_bla_backbone_gw *entry;
482 struct batadv_orig_node *orig_node;
485 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
490 batadv_dbg(BATADV_DBG_BLA, bat_priv,
491 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
492 orig, BATADV_PRINT_VID(vid));
494 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
499 entry->lasttime = jiffies;
500 entry->crc = BATADV_BLA_CRC_INIT;
501 entry->bat_priv = bat_priv;
502 spin_lock_init(&entry->crc_lock);
503 atomic_set(&entry->request_sent, 0);
504 atomic_set(&entry->wait_periods, 0);
505 ether_addr_copy(entry->orig, orig);
506 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
508 /* one for the hash, one for returning */
509 kref_init(&entry->refcount);
510 kref_get(&entry->refcount);
512 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
513 batadv_compare_backbone_gw,
514 batadv_choose_backbone_gw, entry,
517 if (unlikely(hash_added != 0)) {
518 /* hash failed, free the structure */
523 /* this is a gateway now, remove any TT entry on this VLAN */
524 orig_node = batadv_orig_hash_find(bat_priv, orig);
526 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
527 "became a backbone gateway");
528 batadv_orig_node_put(orig_node);
532 batadv_bla_send_announce(bat_priv, entry);
534 /* this will be decreased in the worker thread */
535 atomic_inc(&entry->request_sent);
536 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
537 atomic_inc(&bat_priv->bla.num_requests);
544 * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN
545 * @bat_priv: the bat priv with all the soft interface information
546 * @primary_if: the selected primary interface
547 * @vid: VLAN identifier
549 * update or add the own backbone gw to make sure we announce
550 * where we receive other backbone gws
553 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
554 struct batadv_hard_iface *primary_if,
557 struct batadv_bla_backbone_gw *backbone_gw;
559 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
560 primary_if->net_dev->dev_addr,
562 if (unlikely(!backbone_gw))
565 backbone_gw->lasttime = jiffies;
566 batadv_backbone_gw_put(backbone_gw);
570 * batadv_bla_answer_request - answer a bla request by sending own claims
571 * @bat_priv: the bat priv with all the soft interface information
572 * @primary_if: interface where the request came on
573 * @vid: the vid where the request came on
575 * Repeat all of our own claims, and finally send an ANNOUNCE frame
576 * to allow the requester another check if the CRC is correct now.
578 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
579 struct batadv_hard_iface *primary_if,
582 struct hlist_head *head;
583 struct batadv_hashtable *hash;
584 struct batadv_bla_claim *claim;
585 struct batadv_bla_backbone_gw *backbone_gw;
588 batadv_dbg(BATADV_DBG_BLA, bat_priv,
589 "bla_answer_request(): received a claim request, send all of our own claims again\n");
591 backbone_gw = batadv_backbone_hash_find(bat_priv,
592 primary_if->net_dev->dev_addr,
597 hash = bat_priv->bla.claim_hash;
598 for (i = 0; i < hash->size; i++) {
599 head = &hash->table[i];
602 hlist_for_each_entry_rcu(claim, head, hash_entry) {
603 /* only own claims are interesting */
604 if (claim->backbone_gw != backbone_gw)
607 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
608 BATADV_CLAIM_TYPE_CLAIM);
613 /* finally, send an announcement frame */
614 batadv_bla_send_announce(bat_priv, backbone_gw);
615 batadv_backbone_gw_put(backbone_gw);
619 * batadv_bla_send_request - send a request to repeat claims
620 * @backbone_gw: the backbone gateway from whom we are out of sync
622 * When the crc is wrong, ask the backbone gateway for a full table update.
623 * After the request, it will repeat all of his own claims and finally
624 * send an announcement claim with which we can check again.
626 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
628 /* first, remove all old entries */
629 batadv_bla_del_backbone_claims(backbone_gw);
631 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
632 "Sending REQUEST to %pM\n", backbone_gw->orig);
635 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
636 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
638 /* no local broadcasts should be sent or received, for now. */
639 if (!atomic_read(&backbone_gw->request_sent)) {
640 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
641 atomic_set(&backbone_gw->request_sent, 1);
646 * batadv_bla_send_announce - Send an announcement frame
647 * @bat_priv: the bat priv with all the soft interface information
648 * @backbone_gw: our backbone gateway which should be announced
650 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
651 struct batadv_bla_backbone_gw *backbone_gw)
656 memcpy(mac, batadv_announce_mac, 4);
657 spin_lock_bh(&backbone_gw->crc_lock);
658 crc = htons(backbone_gw->crc);
659 spin_unlock_bh(&backbone_gw->crc_lock);
660 memcpy(&mac[4], &crc, 2);
662 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
663 BATADV_CLAIM_TYPE_ANNOUNCE);
667 * batadv_bla_add_claim - Adds a claim in the claim hash
668 * @bat_priv: the bat priv with all the soft interface information
669 * @mac: the mac address of the claim
670 * @vid: the VLAN ID of the frame
671 * @backbone_gw: the backbone gateway which claims it
673 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
674 const u8 *mac, const unsigned short vid,
675 struct batadv_bla_backbone_gw *backbone_gw)
677 struct batadv_bla_claim *claim;
678 struct batadv_bla_claim search_claim;
681 ether_addr_copy(search_claim.addr, mac);
682 search_claim.vid = vid;
683 claim = batadv_claim_hash_find(bat_priv, &search_claim);
685 /* create a new claim entry if it does not exist yet. */
687 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
691 ether_addr_copy(claim->addr, mac);
693 claim->lasttime = jiffies;
694 claim->backbone_gw = backbone_gw;
696 kref_init(&claim->refcount);
697 kref_get(&claim->refcount);
698 batadv_dbg(BATADV_DBG_BLA, bat_priv,
699 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
700 mac, BATADV_PRINT_VID(vid));
701 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
702 batadv_compare_claim,
703 batadv_choose_claim, claim,
706 if (unlikely(hash_added != 0)) {
707 /* only local changes happened. */
712 claim->lasttime = jiffies;
713 if (claim->backbone_gw == backbone_gw)
714 /* no need to register a new backbone */
717 batadv_dbg(BATADV_DBG_BLA, bat_priv,
718 "bla_add_claim(): changing ownership for %pM, vid %d\n",
719 mac, BATADV_PRINT_VID(vid));
721 spin_lock_bh(&claim->backbone_gw->crc_lock);
722 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
723 spin_unlock_bh(&claim->backbone_gw->crc_lock);
724 batadv_backbone_gw_put(claim->backbone_gw);
726 /* set (new) backbone gw */
727 kref_get(&backbone_gw->refcount);
728 claim->backbone_gw = backbone_gw;
730 spin_lock_bh(&backbone_gw->crc_lock);
731 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
732 spin_unlock_bh(&backbone_gw->crc_lock);
733 backbone_gw->lasttime = jiffies;
736 batadv_claim_put(claim);
740 * batadv_bla_del_claim - delete a claim from the claim hash
741 * @bat_priv: the bat priv with all the soft interface information
742 * @mac: mac address of the claim to be removed
743 * @vid: VLAN id for the claim to be removed
745 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
746 const u8 *mac, const unsigned short vid)
748 struct batadv_bla_claim search_claim, *claim;
750 ether_addr_copy(search_claim.addr, mac);
751 search_claim.vid = vid;
752 claim = batadv_claim_hash_find(bat_priv, &search_claim);
756 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
757 mac, BATADV_PRINT_VID(vid));
759 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
760 batadv_choose_claim, claim);
761 batadv_claim_put(claim); /* reference from the hash is gone */
763 spin_lock_bh(&claim->backbone_gw->crc_lock);
764 claim->backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
765 spin_unlock_bh(&claim->backbone_gw->crc_lock);
767 /* don't need the reference from hash_find() anymore */
768 batadv_claim_put(claim);
772 * batadv_handle_announce - check for ANNOUNCE frame
773 * @bat_priv: the bat priv with all the soft interface information
774 * @an_addr: announcement mac address (ARP Sender HW address)
775 * @backbone_addr: originator address of the sender (Ethernet source MAC)
776 * @vid: the VLAN ID of the frame
778 * Return: true if handled
780 static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
781 u8 *backbone_addr, unsigned short vid)
783 struct batadv_bla_backbone_gw *backbone_gw;
784 u16 backbone_crc, crc;
786 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
789 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
792 if (unlikely(!backbone_gw))
795 /* handle as ANNOUNCE frame */
796 backbone_gw->lasttime = jiffies;
797 crc = ntohs(*((__be16 *)(&an_addr[4])));
799 batadv_dbg(BATADV_DBG_BLA, bat_priv,
800 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
801 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
803 spin_lock_bh(&backbone_gw->crc_lock);
804 backbone_crc = backbone_gw->crc;
805 spin_unlock_bh(&backbone_gw->crc_lock);
807 if (backbone_crc != crc) {
808 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
809 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
811 BATADV_PRINT_VID(backbone_gw->vid),
814 batadv_bla_send_request(backbone_gw);
816 /* if we have sent a request and the crc was OK,
817 * we can allow traffic again.
819 if (atomic_read(&backbone_gw->request_sent)) {
820 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
821 atomic_set(&backbone_gw->request_sent, 0);
825 batadv_backbone_gw_put(backbone_gw);
830 * batadv_handle_request - check for REQUEST frame
831 * @bat_priv: the bat priv with all the soft interface information
832 * @primary_if: the primary hard interface of this batman soft interface
833 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
834 * @ethhdr: ethernet header of a packet
835 * @vid: the VLAN ID of the frame
837 * Return: true if handled
839 static bool batadv_handle_request(struct batadv_priv *bat_priv,
840 struct batadv_hard_iface *primary_if,
841 u8 *backbone_addr, struct ethhdr *ethhdr,
844 /* check for REQUEST frame */
845 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
848 /* sanity check, this should not happen on a normal switch,
849 * we ignore it in this case.
851 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
854 batadv_dbg(BATADV_DBG_BLA, bat_priv,
855 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
856 BATADV_PRINT_VID(vid), ethhdr->h_source);
858 batadv_bla_answer_request(bat_priv, primary_if, vid);
863 * batadv_handle_unclaim - check for UNCLAIM frame
864 * @bat_priv: the bat priv with all the soft interface information
865 * @primary_if: the primary hard interface of this batman soft interface
866 * @backbone_addr: originator address of the backbone (Ethernet source)
867 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
868 * @vid: the VLAN ID of the frame
870 * Return: true if handled
872 static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
873 struct batadv_hard_iface *primary_if,
874 u8 *backbone_addr, u8 *claim_addr,
877 struct batadv_bla_backbone_gw *backbone_gw;
879 /* unclaim in any case if it is our own */
880 if (primary_if && batadv_compare_eth(backbone_addr,
881 primary_if->net_dev->dev_addr))
882 batadv_bla_send_claim(bat_priv, claim_addr, vid,
883 BATADV_CLAIM_TYPE_UNCLAIM);
885 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
890 /* this must be an UNCLAIM frame */
891 batadv_dbg(BATADV_DBG_BLA, bat_priv,
892 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
893 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
895 batadv_bla_del_claim(bat_priv, claim_addr, vid);
896 batadv_backbone_gw_put(backbone_gw);
901 * batadv_handle_claim - check for CLAIM frame
902 * @bat_priv: the bat priv with all the soft interface information
903 * @primary_if: the primary hard interface of this batman soft interface
904 * @backbone_addr: originator address of the backbone (Ethernet Source)
905 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
906 * @vid: the VLAN ID of the frame
908 * Return: true if handled
910 static bool batadv_handle_claim(struct batadv_priv *bat_priv,
911 struct batadv_hard_iface *primary_if,
912 u8 *backbone_addr, u8 *claim_addr,
915 struct batadv_bla_backbone_gw *backbone_gw;
917 /* register the gateway if not yet available, and add the claim. */
919 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
922 if (unlikely(!backbone_gw))
925 /* this must be a CLAIM frame */
926 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
927 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
928 batadv_bla_send_claim(bat_priv, claim_addr, vid,
929 BATADV_CLAIM_TYPE_CLAIM);
931 /* TODO: we could call something like tt_local_del() here. */
933 batadv_backbone_gw_put(backbone_gw);
938 * batadv_check_claim_group - check for claim group membership
939 * @bat_priv: the bat priv with all the soft interface information
940 * @primary_if: the primary interface of this batman interface
941 * @hw_src: the Hardware source in the ARP Header
942 * @hw_dst: the Hardware destination in the ARP Header
943 * @ethhdr: pointer to the Ethernet header of the claim frame
945 * checks if it is a claim packet and if its on the same group.
946 * This function also applies the group ID of the sender
947 * if it is in the same mesh.
950 * 2 - if it is a claim packet and on the same group
951 * 1 - if is a claim packet from another group
952 * 0 - if it is not a claim packet
954 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
955 struct batadv_hard_iface *primary_if,
956 u8 *hw_src, u8 *hw_dst,
957 struct ethhdr *ethhdr)
960 struct batadv_orig_node *orig_node;
961 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
963 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
964 bla_dst_own = &bat_priv->bla.claim_dest;
966 /* if announcement packet, use the source,
967 * otherwise assume it is in the hw_src
969 switch (bla_dst->type) {
970 case BATADV_CLAIM_TYPE_CLAIM:
971 backbone_addr = hw_src;
973 case BATADV_CLAIM_TYPE_REQUEST:
974 case BATADV_CLAIM_TYPE_ANNOUNCE:
975 case BATADV_CLAIM_TYPE_UNCLAIM:
976 backbone_addr = ethhdr->h_source;
982 /* don't accept claim frames from ourselves */
983 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
986 /* if its already the same group, it is fine. */
987 if (bla_dst->group == bla_dst_own->group)
990 /* lets see if this originator is in our mesh */
991 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
993 /* dont accept claims from gateways which are not in
994 * the same mesh or group.
999 /* if our mesh friends mac is bigger, use it for ourselves. */
1000 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
1001 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1002 "taking other backbones claim group: %#.4x\n",
1003 ntohs(bla_dst->group));
1004 bla_dst_own->group = bla_dst->group;
1007 batadv_orig_node_put(orig_node);
1013 * batadv_bla_process_claim - Check if this is a claim frame, and process it
1014 * @bat_priv: the bat priv with all the soft interface information
1015 * @primary_if: the primary hard interface of this batman soft interface
1016 * @skb: the frame to be checked
1018 * Return: true if it was a claim frame, otherwise return false to
1019 * tell the callee that it can use the frame on its own.
1021 static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1022 struct batadv_hard_iface *primary_if,
1023 struct sk_buff *skb)
1025 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1026 u8 *hw_src, *hw_dst;
1027 struct vlan_hdr *vhdr, vhdr_buf;
1028 struct ethhdr *ethhdr;
1029 struct arphdr *arphdr;
1036 vid = batadv_get_vid(skb, 0);
1037 ethhdr = eth_hdr(skb);
1039 proto = ethhdr->h_proto;
1041 if (vid & BATADV_VLAN_HAS_TAG) {
1042 /* Traverse the VLAN/Ethertypes.
1044 * At this point it is known that the first protocol is a VLAN
1045 * header, so start checking at the encapsulated protocol.
1047 * The depth of the VLAN headers is recorded to drop BLA claim
1048 * frames encapsulated into multiple VLAN headers (QinQ).
1051 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1056 proto = vhdr->h_vlan_encapsulated_proto;
1057 headlen += VLAN_HLEN;
1059 } while (proto == htons(ETH_P_8021Q));
1062 if (proto != htons(ETH_P_ARP))
1063 return false; /* not a claim frame */
1065 /* this must be a ARP frame. check if it is a claim. */
1067 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1070 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
1071 ethhdr = eth_hdr(skb);
1072 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
1074 /* Check whether the ARP frame carries a valid
1077 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1079 if (arphdr->ar_pro != htons(ETH_P_IP))
1081 if (arphdr->ar_hln != ETH_ALEN)
1083 if (arphdr->ar_pln != 4)
1086 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
1087 hw_dst = hw_src + ETH_ALEN + 4;
1088 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1089 bla_dst_own = &bat_priv->bla.claim_dest;
1091 /* check if it is a claim frame in general */
1092 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1093 sizeof(bla_dst->magic)) != 0)
1096 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1097 * drop that, as this is not supported by BLA but should also not be
1098 * sent via the mesh.
1103 /* Let the loopdetect frames on the mesh in any case. */
1104 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
1107 /* check if it is a claim frame. */
1108 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1111 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1112 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1113 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
1119 /* become a backbone gw ourselves on this vlan if not happened yet */
1120 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1122 /* check for the different types of claim frames ... */
1123 switch (bla_dst->type) {
1124 case BATADV_CLAIM_TYPE_CLAIM:
1125 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1126 ethhdr->h_source, vid))
1129 case BATADV_CLAIM_TYPE_UNCLAIM:
1130 if (batadv_handle_unclaim(bat_priv, primary_if,
1131 ethhdr->h_source, hw_src, vid))
1135 case BATADV_CLAIM_TYPE_ANNOUNCE:
1136 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1140 case BATADV_CLAIM_TYPE_REQUEST:
1141 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1147 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1148 "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",
1149 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
1154 * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or
1156 * @bat_priv: the bat priv with all the soft interface information
1157 * @now: whether the whole hash shall be wiped now
1159 * Check when we last heard from other nodes, and remove them in case of
1160 * a time out, or clean all backbone gws if now is set.
1162 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1164 struct batadv_bla_backbone_gw *backbone_gw;
1165 struct hlist_node *node_tmp;
1166 struct hlist_head *head;
1167 struct batadv_hashtable *hash;
1168 spinlock_t *list_lock; /* protects write access to the hash lists */
1171 hash = bat_priv->bla.backbone_hash;
1175 for (i = 0; i < hash->size; i++) {
1176 head = &hash->table[i];
1177 list_lock = &hash->list_locks[i];
1179 spin_lock_bh(list_lock);
1180 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1184 if (!batadv_has_timed_out(backbone_gw->lasttime,
1185 BATADV_BLA_BACKBONE_TIMEOUT))
1188 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1189 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1193 /* don't wait for the pending request anymore */
1194 if (atomic_read(&backbone_gw->request_sent))
1195 atomic_dec(&bat_priv->bla.num_requests);
1197 batadv_bla_del_backbone_claims(backbone_gw);
1199 hlist_del_rcu(&backbone_gw->hash_entry);
1200 batadv_backbone_gw_put(backbone_gw);
1202 spin_unlock_bh(list_lock);
1207 * batadv_bla_purge_claims - Remove claims after a timeout or immediately
1208 * @bat_priv: the bat priv with all the soft interface information
1209 * @primary_if: the selected primary interface, may be NULL if now is set
1210 * @now: whether the whole hash shall be wiped now
1212 * Check when we heard last time from our own claims, and remove them in case of
1213 * a time out, or clean all claims if now is set
1215 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1216 struct batadv_hard_iface *primary_if,
1219 struct batadv_bla_claim *claim;
1220 struct hlist_head *head;
1221 struct batadv_hashtable *hash;
1224 hash = bat_priv->bla.claim_hash;
1228 for (i = 0; i < hash->size; i++) {
1229 head = &hash->table[i];
1232 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1235 if (!batadv_compare_eth(claim->backbone_gw->orig,
1236 primary_if->net_dev->dev_addr))
1238 if (!batadv_has_timed_out(claim->lasttime,
1239 BATADV_BLA_CLAIM_TIMEOUT))
1242 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1243 "bla_purge_claims(): %pM, vid %d, time out\n",
1244 claim->addr, claim->vid);
1247 batadv_handle_unclaim(bat_priv, primary_if,
1248 claim->backbone_gw->orig,
1249 claim->addr, claim->vid);
1256 * batadv_bla_update_orig_address - Update the backbone gateways when the own
1257 * originator address changes
1258 * @bat_priv: the bat priv with all the soft interface information
1259 * @primary_if: the new selected primary_if
1260 * @oldif: the old primary interface, may be NULL
1262 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1263 struct batadv_hard_iface *primary_if,
1264 struct batadv_hard_iface *oldif)
1266 struct batadv_bla_backbone_gw *backbone_gw;
1267 struct hlist_head *head;
1268 struct batadv_hashtable *hash;
1272 /* reset bridge loop avoidance group id */
1273 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1274 bat_priv->bla.claim_dest.group = group;
1276 /* purge everything when bridge loop avoidance is turned off */
1277 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1281 batadv_bla_purge_claims(bat_priv, NULL, 1);
1282 batadv_bla_purge_backbone_gw(bat_priv, 1);
1286 hash = bat_priv->bla.backbone_hash;
1290 for (i = 0; i < hash->size; i++) {
1291 head = &hash->table[i];
1294 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1295 /* own orig still holds the old value. */
1296 if (!batadv_compare_eth(backbone_gw->orig,
1297 oldif->net_dev->dev_addr))
1300 ether_addr_copy(backbone_gw->orig,
1301 primary_if->net_dev->dev_addr);
1302 /* send an announce frame so others will ask for our
1303 * claims and update their tables.
1305 batadv_bla_send_announce(bat_priv, backbone_gw);
1312 * batadv_bla_send_loopdetect - send a loopdetect frame
1313 * @bat_priv: the bat priv with all the soft interface information
1314 * @backbone_gw: the backbone gateway for which a loop should be detected
1316 * To detect loops that the bridge loop avoidance can't handle, send a loop
1317 * detection packet on the backbone. Unlike other BLA frames, this frame will
1318 * be allowed on the mesh by other nodes. If it is received on the mesh, this
1319 * indicates that there is a loop.
1322 batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1323 struct batadv_bla_backbone_gw *backbone_gw)
1325 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1327 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1328 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1332 * batadv_bla_status_update - purge bla interfaces if necessary
1333 * @net_dev: the soft interface net device
1335 void batadv_bla_status_update(struct net_device *net_dev)
1337 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1338 struct batadv_hard_iface *primary_if;
1340 primary_if = batadv_primary_if_get_selected(bat_priv);
1344 /* this function already purges everything when bla is disabled,
1345 * so just call that one.
1347 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1348 batadv_hardif_put(primary_if);
1352 * batadv_bla_periodic_work - performs periodic bla work
1353 * @work: kernel work struct
1355 * periodic work to do:
1356 * * purge structures when they are too old
1357 * * send announcements
1359 static void batadv_bla_periodic_work(struct work_struct *work)
1361 struct delayed_work *delayed_work;
1362 struct batadv_priv *bat_priv;
1363 struct batadv_priv_bla *priv_bla;
1364 struct hlist_head *head;
1365 struct batadv_bla_backbone_gw *backbone_gw;
1366 struct batadv_hashtable *hash;
1367 struct batadv_hard_iface *primary_if;
1368 bool send_loopdetect = false;
1371 delayed_work = to_delayed_work(work);
1372 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1373 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1374 primary_if = batadv_primary_if_get_selected(bat_priv);
1378 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1379 batadv_bla_purge_backbone_gw(bat_priv, 0);
1381 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1384 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1385 /* set a new random mac address for the next bridge loop
1386 * detection frames. Set the locally administered bit to avoid
1387 * collisions with users mac addresses.
1389 random_ether_addr(bat_priv->bla.loopdetect_addr);
1390 bat_priv->bla.loopdetect_addr[0] = 0xba;
1391 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1392 bat_priv->bla.loopdetect_lasttime = jiffies;
1393 atomic_set(&bat_priv->bla.loopdetect_next,
1394 BATADV_BLA_LOOPDETECT_PERIODS);
1396 /* mark for sending loop detect on all VLANs */
1397 send_loopdetect = true;
1400 hash = bat_priv->bla.backbone_hash;
1404 for (i = 0; i < hash->size; i++) {
1405 head = &hash->table[i];
1408 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1409 if (!batadv_compare_eth(backbone_gw->orig,
1410 primary_if->net_dev->dev_addr))
1413 backbone_gw->lasttime = jiffies;
1415 batadv_bla_send_announce(bat_priv, backbone_gw);
1416 if (send_loopdetect)
1417 batadv_bla_send_loopdetect(bat_priv,
1420 /* request_sent is only set after creation to avoid
1421 * problems when we are not yet known as backbone gw
1424 * We can reset this now after we waited some periods
1425 * to give bridge forward delays and bla group forming
1429 if (atomic_read(&backbone_gw->request_sent) == 0)
1432 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1435 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1436 atomic_set(&backbone_gw->request_sent, 0);
1442 batadv_hardif_put(primary_if);
1444 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1445 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1448 /* The hash for claim and backbone hash receive the same key because they
1449 * are getting initialized by hash_new with the same key. Reinitializing
1450 * them with to different keys to allow nested locking without generating
1453 static struct lock_class_key batadv_claim_hash_lock_class_key;
1454 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1457 * batadv_bla_init - initialize all bla structures
1458 * @bat_priv: the bat priv with all the soft interface information
1460 * Return: 0 on success, < 0 on error.
1462 int batadv_bla_init(struct batadv_priv *bat_priv)
1465 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1466 struct batadv_hard_iface *primary_if;
1468 unsigned long entrytime;
1470 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1472 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1474 /* setting claim destination address */
1475 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1476 bat_priv->bla.claim_dest.type = 0;
1477 primary_if = batadv_primary_if_get_selected(bat_priv);
1479 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1480 bat_priv->bla.claim_dest.group = htons(crc);
1481 batadv_hardif_put(primary_if);
1483 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1486 /* initialize the duplicate list */
1487 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1488 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1489 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1490 bat_priv->bla.bcast_duplist_curr = 0;
1492 atomic_set(&bat_priv->bla.loopdetect_next,
1493 BATADV_BLA_LOOPDETECT_PERIODS);
1495 if (bat_priv->bla.claim_hash)
1498 bat_priv->bla.claim_hash = batadv_hash_new(128);
1499 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1501 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1504 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1505 &batadv_claim_hash_lock_class_key);
1506 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1507 &batadv_backbone_hash_lock_class_key);
1509 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1511 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1513 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1514 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1519 * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup.
1520 * @bat_priv: the bat priv with all the soft interface information
1521 * @skb: contains the bcast_packet to be checked
1523 * check if it is on our broadcast list. Another gateway might
1524 * have sent the same packet because it is connected to the same backbone,
1525 * so we have to remove this duplicate.
1527 * This is performed by checking the CRC, which will tell us
1528 * with a good chance that it is the same packet. If it is furthermore
1529 * sent by another host, drop it. We allow equal packets from
1530 * the same host however as this might be intended.
1532 * Return: true if a packet is in the duplicate list, false otherwise.
1534 bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1535 struct sk_buff *skb)
1539 struct batadv_bcast_packet *bcast_packet;
1540 struct batadv_bcast_duplist_entry *entry;
1543 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1545 /* calculate the crc ... */
1546 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1548 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1550 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1551 curr = (bat_priv->bla.bcast_duplist_curr + i);
1552 curr %= BATADV_DUPLIST_SIZE;
1553 entry = &bat_priv->bla.bcast_duplist[curr];
1555 /* we can stop searching if the entry is too old ;
1556 * later entries will be even older
1558 if (batadv_has_timed_out(entry->entrytime,
1559 BATADV_DUPLIST_TIMEOUT))
1562 if (entry->crc != crc)
1565 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1568 /* this entry seems to match: same crc, not too old,
1569 * and from another gw. therefore return true to forbid it.
1574 /* not found, add a new entry (overwrite the oldest entry)
1575 * and allow it, its the first occurrence.
1577 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1578 curr %= BATADV_DUPLIST_SIZE;
1579 entry = &bat_priv->bla.bcast_duplist[curr];
1581 entry->entrytime = jiffies;
1582 ether_addr_copy(entry->orig, bcast_packet->orig);
1583 bat_priv->bla.bcast_duplist_curr = curr;
1586 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1592 * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for
1593 * the VLAN identified by vid.
1594 * @bat_priv: the bat priv with all the soft interface information
1595 * @orig: originator mac address
1596 * @vid: VLAN identifier
1598 * Return: true if orig is a backbone for this vid, false otherwise.
1600 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1603 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1604 struct hlist_head *head;
1605 struct batadv_bla_backbone_gw *backbone_gw;
1608 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1614 for (i = 0; i < hash->size; i++) {
1615 head = &hash->table[i];
1618 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1619 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1620 backbone_gw->vid == vid) {
1632 * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN.
1633 * @skb: the frame to be checked
1634 * @orig_node: the orig_node of the frame
1635 * @hdr_size: maximum length of the frame
1637 * Return: true if the orig_node is also a gateway on the soft interface,
1638 * otherwise it returns false.
1640 bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1641 struct batadv_orig_node *orig_node, int hdr_size)
1643 struct batadv_bla_backbone_gw *backbone_gw;
1646 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1649 /* first, find out the vid. */
1650 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1653 vid = batadv_get_vid(skb, hdr_size);
1655 /* see if this originator is a backbone gw for this VLAN */
1656 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1657 orig_node->orig, vid);
1661 batadv_backbone_gw_put(backbone_gw);
1666 * batadv_bla_free - free all bla structures
1667 * @bat_priv: the bat priv with all the soft interface information
1669 * for softinterface free or module unload
1671 void batadv_bla_free(struct batadv_priv *bat_priv)
1673 struct batadv_hard_iface *primary_if;
1675 cancel_delayed_work_sync(&bat_priv->bla.work);
1676 primary_if = batadv_primary_if_get_selected(bat_priv);
1678 if (bat_priv->bla.claim_hash) {
1679 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1680 batadv_hash_destroy(bat_priv->bla.claim_hash);
1681 bat_priv->bla.claim_hash = NULL;
1683 if (bat_priv->bla.backbone_hash) {
1684 batadv_bla_purge_backbone_gw(bat_priv, 1);
1685 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1686 bat_priv->bla.backbone_hash = NULL;
1689 batadv_hardif_put(primary_if);
1693 * batadv_bla_loopdetect_check - check and handle a detected loop
1694 * @bat_priv: the bat priv with all the soft interface information
1695 * @skb: the packet to check
1696 * @primary_if: interface where the request came on
1697 * @vid: the VLAN ID of the frame
1699 * Checks if this packet is a loop detect frame which has been sent by us,
1700 * throw an uevent and log the event if that is the case.
1702 * Return: true if it is a loop detect frame which is to be dropped, false
1706 batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1707 struct batadv_hard_iface *primary_if,
1710 struct batadv_bla_backbone_gw *backbone_gw;
1711 struct ethhdr *ethhdr;
1713 ethhdr = eth_hdr(skb);
1715 /* Only check for the MAC address and skip more checks here for
1716 * performance reasons - this function is on the hotpath, after all.
1718 if (!batadv_compare_eth(ethhdr->h_source,
1719 bat_priv->bla.loopdetect_addr))
1722 /* If the packet came too late, don't forward it on the mesh
1723 * but don't consider that as loop. It might be a coincidence.
1725 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1726 BATADV_BLA_LOOPDETECT_TIMEOUT))
1729 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1730 primary_if->net_dev->dev_addr,
1732 if (unlikely(!backbone_gw))
1735 queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1736 /* backbone_gw is unreferenced in the report work function function */
1742 * batadv_bla_rx - check packets coming from the mesh.
1743 * @bat_priv: the bat priv with all the soft interface information
1744 * @skb: the frame to be checked
1745 * @vid: the VLAN ID of the frame
1746 * @is_bcast: the packet came in a broadcast packet type.
1748 * batadv_bla_rx avoidance checks if:
1749 * * we have to race for a claim
1750 * * if the frame is allowed on the LAN
1752 * in these cases, the skb is further handled by this function
1754 * Return: true if handled, otherwise it returns false and the caller shall
1755 * further process the skb.
1757 bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1758 unsigned short vid, bool is_bcast)
1760 struct ethhdr *ethhdr;
1761 struct batadv_bla_claim search_claim, *claim = NULL;
1762 struct batadv_hard_iface *primary_if;
1765 ethhdr = eth_hdr(skb);
1767 primary_if = batadv_primary_if_get_selected(bat_priv);
1771 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1774 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1777 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1778 /* don't allow broadcasts while requests are in flight */
1779 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1782 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1783 search_claim.vid = vid;
1784 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1787 /* possible optimization: race for a claim */
1788 /* No claim exists yet, claim it for us!
1790 batadv_handle_claim(bat_priv, primary_if,
1791 primary_if->net_dev->dev_addr,
1792 ethhdr->h_source, vid);
1796 /* if it is our own claim ... */
1797 if (batadv_compare_eth(claim->backbone_gw->orig,
1798 primary_if->net_dev->dev_addr)) {
1799 /* ... allow it in any case */
1800 claim->lasttime = jiffies;
1804 /* if it is a broadcast ... */
1805 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1806 /* ... drop it. the responsible gateway is in charge.
1808 * We need to check is_bcast because with the gateway
1809 * feature, broadcasts (like DHCP requests) may be sent
1810 * using a unicast packet type.
1814 /* seems the client considers us as its best gateway.
1815 * send a claim and update the claim table
1818 batadv_handle_claim(bat_priv, primary_if,
1819 primary_if->net_dev->dev_addr,
1820 ethhdr->h_source, vid);
1824 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1834 batadv_hardif_put(primary_if);
1836 batadv_claim_put(claim);
1841 * batadv_bla_tx - check packets going into the mesh
1842 * @bat_priv: the bat priv with all the soft interface information
1843 * @skb: the frame to be checked
1844 * @vid: the VLAN ID of the frame
1846 * batadv_bla_tx checks if:
1847 * * a claim was received which has to be processed
1848 * * the frame is allowed on the mesh
1850 * in these cases, the skb is further handled by this function.
1852 * This call might reallocate skb data.
1854 * Return: true if handled, otherwise it returns false and the caller shall
1855 * further process the skb.
1857 bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1860 struct ethhdr *ethhdr;
1861 struct batadv_bla_claim search_claim, *claim = NULL;
1862 struct batadv_hard_iface *primary_if;
1865 primary_if = batadv_primary_if_get_selected(bat_priv);
1869 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1872 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1875 ethhdr = eth_hdr(skb);
1877 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1878 /* don't allow broadcasts while requests are in flight */
1879 if (is_multicast_ether_addr(ethhdr->h_dest))
1882 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1883 search_claim.vid = vid;
1885 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1887 /* if no claim exists, allow it. */
1891 /* check if we are responsible. */
1892 if (batadv_compare_eth(claim->backbone_gw->orig,
1893 primary_if->net_dev->dev_addr)) {
1894 /* if yes, the client has roamed and we have
1897 batadv_handle_unclaim(bat_priv, primary_if,
1898 primary_if->net_dev->dev_addr,
1899 ethhdr->h_source, vid);
1903 /* check if it is a multicast/broadcast frame */
1904 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1905 /* drop it. the responsible gateway has forwarded it into
1906 * the backbone network.
1910 /* we must allow it. at least if we are
1911 * responsible for the DESTINATION.
1916 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1923 batadv_hardif_put(primary_if);
1925 batadv_claim_put(claim);
1930 * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file
1931 * @seq: seq file to print on
1936 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
1938 struct net_device *net_dev = (struct net_device *)seq->private;
1939 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1940 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
1941 struct batadv_bla_claim *claim;
1942 struct batadv_hard_iface *primary_if;
1943 struct hlist_head *head;
1949 primary_if = batadv_seq_print_text_primary_if_get(seq);
1953 primary_addr = primary_if->net_dev->dev_addr;
1955 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1956 net_dev->name, primary_addr,
1957 ntohs(bat_priv->bla.claim_dest.group));
1959 " Client VID Originator [o] (CRC )\n");
1960 for (i = 0; i < hash->size; i++) {
1961 head = &hash->table[i];
1964 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1965 is_own = batadv_compare_eth(claim->backbone_gw->orig,
1968 spin_lock_bh(&claim->backbone_gw->crc_lock);
1969 backbone_crc = claim->backbone_gw->crc;
1970 spin_unlock_bh(&claim->backbone_gw->crc_lock);
1971 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
1972 claim->addr, BATADV_PRINT_VID(claim->vid),
1973 claim->backbone_gw->orig,
1974 (is_own ? 'x' : ' '),
1981 batadv_hardif_put(primary_if);
1986 * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq
1988 * @seq: seq file to print on
1993 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
1995 struct net_device *net_dev = (struct net_device *)seq->private;
1996 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1997 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1998 struct batadv_bla_backbone_gw *backbone_gw;
1999 struct batadv_hard_iface *primary_if;
2000 struct hlist_head *head;
2007 primary_if = batadv_seq_print_text_primary_if_get(seq);
2011 primary_addr = primary_if->net_dev->dev_addr;
2013 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
2014 net_dev->name, primary_addr,
2015 ntohs(bat_priv->bla.claim_dest.group));
2016 seq_puts(seq, " Originator VID last seen (CRC )\n");
2017 for (i = 0; i < hash->size; i++) {
2018 head = &hash->table[i];
2021 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2022 msecs = jiffies_to_msecs(jiffies -
2023 backbone_gw->lasttime);
2024 secs = msecs / 1000;
2025 msecs = msecs % 1000;
2027 is_own = batadv_compare_eth(backbone_gw->orig,
2032 spin_lock_bh(&backbone_gw->crc_lock);
2033 backbone_crc = backbone_gw->crc;
2034 spin_unlock_bh(&backbone_gw->crc_lock);
2036 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
2038 BATADV_PRINT_VID(backbone_gw->vid), secs,
2039 msecs, backbone_crc);
2045 batadv_hardif_put(primary_if);