1 /* Copyright (C) 2011-2017 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/netlink.h>
39 #include <linux/rculist.h>
40 #include <linux/rcupdate.h>
41 #include <linux/seq_file.h>
42 #include <linux/skbuff.h>
43 #include <linux/slab.h>
44 #include <linux/spinlock.h>
45 #include <linux/stddef.h>
46 #include <linux/string.h>
47 #include <linux/workqueue.h>
49 #include <net/genetlink.h>
50 #include <net/netlink.h>
52 #include <uapi/linux/batman_adv.h>
54 #include "hard-interface.h"
58 #include "originator.h"
60 #include "soft-interface.h"
62 #include "translation-table.h"
64 static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
66 static void batadv_bla_periodic_work(struct work_struct *work);
68 batadv_bla_send_announce(struct batadv_priv *bat_priv,
69 struct batadv_bla_backbone_gw *backbone_gw);
72 * batadv_choose_claim - choose the right bucket for a claim.
74 * @size: size of the hash table
76 * Return: the hash index of the claim
78 static inline u32 batadv_choose_claim(const void *data, u32 size)
80 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
83 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
84 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
90 * batadv_choose_backbone_gw - choose the right bucket for a backbone gateway.
92 * @size: size of the hash table
94 * Return: the hash index of the backbone gateway
96 static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
98 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
101 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
102 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
108 * batadv_compare_backbone_gw - compare address and vid of two backbone gws
109 * @node: list node of the first entry to compare
110 * @data2: pointer to the second backbone gateway
112 * Return: true if the backbones have the same data, false otherwise
114 static bool batadv_compare_backbone_gw(const struct hlist_node *node,
117 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
119 const struct batadv_bla_backbone_gw *gw1 = data1;
120 const struct batadv_bla_backbone_gw *gw2 = data2;
122 if (!batadv_compare_eth(gw1->orig, gw2->orig))
125 if (gw1->vid != gw2->vid)
132 * batadv_compare_claim - compare address and vid of two claims
133 * @node: list node of the first entry to compare
134 * @data2: pointer to the second claims
136 * Return: true if the claim have the same data, 0 otherwise
138 static bool batadv_compare_claim(const struct hlist_node *node,
141 const void *data1 = container_of(node, struct batadv_bla_claim,
143 const struct batadv_bla_claim *cl1 = data1;
144 const struct batadv_bla_claim *cl2 = data2;
146 if (!batadv_compare_eth(cl1->addr, cl2->addr))
149 if (cl1->vid != cl2->vid)
156 * batadv_backbone_gw_release - release backbone gw from lists and queue for
157 * free after rcu grace period
158 * @ref: kref pointer of the backbone gw
160 static void batadv_backbone_gw_release(struct kref *ref)
162 struct batadv_bla_backbone_gw *backbone_gw;
164 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
167 kfree_rcu(backbone_gw, rcu);
171 * batadv_backbone_gw_put - decrement the backbone gw refcounter and possibly
173 * @backbone_gw: backbone gateway to be free'd
175 static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
177 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
181 * batadv_claim_release - release claim from lists and queue for free after rcu
183 * @ref: kref pointer of the claim
185 static void batadv_claim_release(struct kref *ref)
187 struct batadv_bla_claim *claim;
188 struct batadv_bla_backbone_gw *old_backbone_gw;
190 claim = container_of(ref, struct batadv_bla_claim, refcount);
192 spin_lock_bh(&claim->backbone_lock);
193 old_backbone_gw = claim->backbone_gw;
194 claim->backbone_gw = NULL;
195 spin_unlock_bh(&claim->backbone_lock);
197 spin_lock_bh(&old_backbone_gw->crc_lock);
198 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
199 spin_unlock_bh(&old_backbone_gw->crc_lock);
201 batadv_backbone_gw_put(old_backbone_gw);
203 kfree_rcu(claim, rcu);
207 * batadv_claim_put - decrement the claim refcounter and possibly
209 * @claim: claim to be free'd
211 static void batadv_claim_put(struct batadv_bla_claim *claim)
213 kref_put(&claim->refcount, batadv_claim_release);
217 * batadv_claim_hash_find - looks for a claim in the claim hash
218 * @bat_priv: the bat priv with all the soft interface information
219 * @data: search data (may be local/static data)
221 * Return: claim if found or NULL otherwise.
223 static struct batadv_bla_claim *
224 batadv_claim_hash_find(struct batadv_priv *bat_priv,
225 struct batadv_bla_claim *data)
227 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
228 struct hlist_head *head;
229 struct batadv_bla_claim *claim;
230 struct batadv_bla_claim *claim_tmp = NULL;
236 index = batadv_choose_claim(data, hash->size);
237 head = &hash->table[index];
240 hlist_for_each_entry_rcu(claim, head, hash_entry) {
241 if (!batadv_compare_claim(&claim->hash_entry, data))
244 if (!kref_get_unless_zero(&claim->refcount))
256 * batadv_backbone_hash_find - looks for a backbone gateway in the hash
257 * @bat_priv: the bat priv with all the soft interface information
258 * @addr: the address of the originator
261 * Return: backbone gateway if found or NULL otherwise
263 static struct batadv_bla_backbone_gw *
264 batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
267 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
268 struct hlist_head *head;
269 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
270 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
276 ether_addr_copy(search_entry.orig, addr);
277 search_entry.vid = vid;
279 index = batadv_choose_backbone_gw(&search_entry, hash->size);
280 head = &hash->table[index];
283 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
284 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
288 if (!kref_get_unless_zero(&backbone_gw->refcount))
291 backbone_gw_tmp = backbone_gw;
296 return backbone_gw_tmp;
300 * batadv_bla_del_backbone_claims - delete all claims for a backbone
301 * @backbone_gw: backbone gateway where the claims should be removed
304 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
306 struct batadv_hashtable *hash;
307 struct hlist_node *node_tmp;
308 struct hlist_head *head;
309 struct batadv_bla_claim *claim;
311 spinlock_t *list_lock; /* protects write access to the hash lists */
313 hash = backbone_gw->bat_priv->bla.claim_hash;
317 for (i = 0; i < hash->size; i++) {
318 head = &hash->table[i];
319 list_lock = &hash->list_locks[i];
321 spin_lock_bh(list_lock);
322 hlist_for_each_entry_safe(claim, node_tmp,
324 if (claim->backbone_gw != backbone_gw)
327 batadv_claim_put(claim);
328 hlist_del_rcu(&claim->hash_entry);
330 spin_unlock_bh(list_lock);
333 /* all claims gone, initialize CRC */
334 spin_lock_bh(&backbone_gw->crc_lock);
335 backbone_gw->crc = BATADV_BLA_CRC_INIT;
336 spin_unlock_bh(&backbone_gw->crc_lock);
340 * batadv_bla_send_claim - sends a claim frame according to the provided info
341 * @bat_priv: the bat priv with all the soft interface information
342 * @mac: the mac address to be announced within the claim
344 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
346 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
347 unsigned short vid, int claimtype)
350 struct ethhdr *ethhdr;
351 struct batadv_hard_iface *primary_if;
352 struct net_device *soft_iface;
354 struct batadv_bla_claim_dst local_claim_dest;
357 primary_if = batadv_primary_if_get_selected(bat_priv);
361 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
362 sizeof(local_claim_dest));
363 local_claim_dest.type = claimtype;
365 soft_iface = primary_if->soft_iface;
367 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
368 /* IP DST: 0.0.0.0 */
370 primary_if->soft_iface,
371 /* IP SRC: 0.0.0.0 */
373 /* Ethernet DST: Broadcast */
375 /* Ethernet SRC/HW SRC: originator mac */
376 primary_if->net_dev->dev_addr,
377 /* HW DST: FF:43:05:XX:YY:YY
378 * with XX = claim type
379 * and YY:YY = group id
381 (u8 *)&local_claim_dest);
386 ethhdr = (struct ethhdr *)skb->data;
387 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
389 /* now we pretend that the client would have sent this ... */
391 case BATADV_CLAIM_TYPE_CLAIM:
392 /* normal claim frame
393 * set Ethernet SRC to the clients mac
395 ether_addr_copy(ethhdr->h_source, mac);
396 batadv_dbg(BATADV_DBG_BLA, bat_priv,
397 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
398 batadv_print_vid(vid));
400 case BATADV_CLAIM_TYPE_UNCLAIM:
402 * set HW SRC to the clients mac
404 ether_addr_copy(hw_src, mac);
405 batadv_dbg(BATADV_DBG_BLA, bat_priv,
406 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
407 batadv_print_vid(vid));
409 case BATADV_CLAIM_TYPE_ANNOUNCE:
410 /* announcement frame
411 * set HW SRC to the special mac containg the crc
413 ether_addr_copy(hw_src, mac);
414 batadv_dbg(BATADV_DBG_BLA, bat_priv,
415 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
416 ethhdr->h_source, batadv_print_vid(vid));
418 case BATADV_CLAIM_TYPE_REQUEST:
420 * set HW SRC and header destination to the receiving backbone
423 ether_addr_copy(hw_src, mac);
424 ether_addr_copy(ethhdr->h_dest, mac);
425 batadv_dbg(BATADV_DBG_BLA, bat_priv,
426 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
427 ethhdr->h_source, ethhdr->h_dest,
428 batadv_print_vid(vid));
430 case BATADV_CLAIM_TYPE_LOOPDETECT:
431 ether_addr_copy(ethhdr->h_source, mac);
432 batadv_dbg(BATADV_DBG_BLA, bat_priv,
433 "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n",
434 ethhdr->h_source, ethhdr->h_dest,
435 batadv_print_vid(vid));
440 if (vid & BATADV_VLAN_HAS_TAG) {
441 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
442 vid & VLAN_VID_MASK);
447 skb_reset_mac_header(skb);
448 skb->protocol = eth_type_trans(skb, soft_iface);
449 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
450 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
451 skb->len + ETH_HLEN);
456 batadv_hardif_put(primary_if);
460 * batadv_bla_loopdetect_report - worker for reporting the loop
461 * @work: work queue item
463 * Throws an uevent, as the loopdetect check function can't do that itself
464 * since the kernel may sleep while throwing uevents.
466 static void batadv_bla_loopdetect_report(struct work_struct *work)
468 struct batadv_bla_backbone_gw *backbone_gw;
469 struct batadv_priv *bat_priv;
470 char vid_str[6] = { '\0' };
472 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
474 bat_priv = backbone_gw->bat_priv;
476 batadv_info(bat_priv->soft_iface,
477 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
478 batadv_print_vid(backbone_gw->vid));
479 snprintf(vid_str, sizeof(vid_str), "%d",
480 batadv_print_vid(backbone_gw->vid));
481 vid_str[sizeof(vid_str) - 1] = 0;
483 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
486 batadv_backbone_gw_put(backbone_gw);
490 * batadv_bla_get_backbone_gw - finds or creates a backbone gateway
491 * @bat_priv: the bat priv with all the soft interface information
492 * @orig: the mac address of the originator
494 * @own_backbone: set if the requested backbone is local
496 * Return: the (possibly created) backbone gateway or NULL on error
498 static struct batadv_bla_backbone_gw *
499 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
500 unsigned short vid, bool own_backbone)
502 struct batadv_bla_backbone_gw *entry;
503 struct batadv_orig_node *orig_node;
506 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
511 batadv_dbg(BATADV_DBG_BLA, bat_priv,
512 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
513 orig, batadv_print_vid(vid));
515 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
520 entry->lasttime = jiffies;
521 entry->crc = BATADV_BLA_CRC_INIT;
522 entry->bat_priv = bat_priv;
523 spin_lock_init(&entry->crc_lock);
524 atomic_set(&entry->request_sent, 0);
525 atomic_set(&entry->wait_periods, 0);
526 ether_addr_copy(entry->orig, orig);
527 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
528 kref_init(&entry->refcount);
530 kref_get(&entry->refcount);
531 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
532 batadv_compare_backbone_gw,
533 batadv_choose_backbone_gw, entry,
536 if (unlikely(hash_added != 0)) {
537 /* hash failed, free the structure */
542 /* this is a gateway now, remove any TT entry on this VLAN */
543 orig_node = batadv_orig_hash_find(bat_priv, orig);
545 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
546 "became a backbone gateway");
547 batadv_orig_node_put(orig_node);
551 batadv_bla_send_announce(bat_priv, entry);
553 /* this will be decreased in the worker thread */
554 atomic_inc(&entry->request_sent);
555 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
556 atomic_inc(&bat_priv->bla.num_requests);
563 * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN
564 * @bat_priv: the bat priv with all the soft interface information
565 * @primary_if: the selected primary interface
566 * @vid: VLAN identifier
568 * update or add the own backbone gw to make sure we announce
569 * where we receive other backbone gws
572 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
573 struct batadv_hard_iface *primary_if,
576 struct batadv_bla_backbone_gw *backbone_gw;
578 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
579 primary_if->net_dev->dev_addr,
581 if (unlikely(!backbone_gw))
584 backbone_gw->lasttime = jiffies;
585 batadv_backbone_gw_put(backbone_gw);
589 * batadv_bla_answer_request - answer a bla request by sending own claims
590 * @bat_priv: the bat priv with all the soft interface information
591 * @primary_if: interface where the request came on
592 * @vid: the vid where the request came on
594 * Repeat all of our own claims, and finally send an ANNOUNCE frame
595 * to allow the requester another check if the CRC is correct now.
597 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
598 struct batadv_hard_iface *primary_if,
601 struct hlist_head *head;
602 struct batadv_hashtable *hash;
603 struct batadv_bla_claim *claim;
604 struct batadv_bla_backbone_gw *backbone_gw;
607 batadv_dbg(BATADV_DBG_BLA, bat_priv,
608 "bla_answer_request(): received a claim request, send all of our own claims again\n");
610 backbone_gw = batadv_backbone_hash_find(bat_priv,
611 primary_if->net_dev->dev_addr,
616 hash = bat_priv->bla.claim_hash;
617 for (i = 0; i < hash->size; i++) {
618 head = &hash->table[i];
621 hlist_for_each_entry_rcu(claim, head, hash_entry) {
622 /* only own claims are interesting */
623 if (claim->backbone_gw != backbone_gw)
626 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
627 BATADV_CLAIM_TYPE_CLAIM);
632 /* finally, send an announcement frame */
633 batadv_bla_send_announce(bat_priv, backbone_gw);
634 batadv_backbone_gw_put(backbone_gw);
638 * batadv_bla_send_request - send a request to repeat claims
639 * @backbone_gw: the backbone gateway from whom we are out of sync
641 * When the crc is wrong, ask the backbone gateway for a full table update.
642 * After the request, it will repeat all of his own claims and finally
643 * send an announcement claim with which we can check again.
645 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
647 /* first, remove all old entries */
648 batadv_bla_del_backbone_claims(backbone_gw);
650 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
651 "Sending REQUEST to %pM\n", backbone_gw->orig);
654 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
655 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
657 /* no local broadcasts should be sent or received, for now. */
658 if (!atomic_read(&backbone_gw->request_sent)) {
659 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
660 atomic_set(&backbone_gw->request_sent, 1);
665 * batadv_bla_send_announce - Send an announcement frame
666 * @bat_priv: the bat priv with all the soft interface information
667 * @backbone_gw: our backbone gateway which should be announced
669 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
670 struct batadv_bla_backbone_gw *backbone_gw)
675 memcpy(mac, batadv_announce_mac, 4);
676 spin_lock_bh(&backbone_gw->crc_lock);
677 crc = htons(backbone_gw->crc);
678 spin_unlock_bh(&backbone_gw->crc_lock);
679 memcpy(&mac[4], &crc, 2);
681 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
682 BATADV_CLAIM_TYPE_ANNOUNCE);
686 * batadv_bla_add_claim - Adds a claim in the claim hash
687 * @bat_priv: the bat priv with all the soft interface information
688 * @mac: the mac address of the claim
689 * @vid: the VLAN ID of the frame
690 * @backbone_gw: the backbone gateway which claims it
692 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
693 const u8 *mac, const unsigned short vid,
694 struct batadv_bla_backbone_gw *backbone_gw)
696 struct batadv_bla_backbone_gw *old_backbone_gw;
697 struct batadv_bla_claim *claim;
698 struct batadv_bla_claim search_claim;
699 bool remove_crc = false;
702 ether_addr_copy(search_claim.addr, mac);
703 search_claim.vid = vid;
704 claim = batadv_claim_hash_find(bat_priv, &search_claim);
706 /* create a new claim entry if it does not exist yet. */
708 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
712 ether_addr_copy(claim->addr, mac);
713 spin_lock_init(&claim->backbone_lock);
715 claim->lasttime = jiffies;
716 kref_get(&backbone_gw->refcount);
717 claim->backbone_gw = backbone_gw;
718 kref_init(&claim->refcount);
720 batadv_dbg(BATADV_DBG_BLA, bat_priv,
721 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
722 mac, batadv_print_vid(vid));
724 kref_get(&claim->refcount);
725 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
726 batadv_compare_claim,
727 batadv_choose_claim, claim,
730 if (unlikely(hash_added != 0)) {
731 /* only local changes happened. */
736 claim->lasttime = jiffies;
737 if (claim->backbone_gw == backbone_gw)
738 /* no need to register a new backbone */
741 batadv_dbg(BATADV_DBG_BLA, bat_priv,
742 "bla_add_claim(): changing ownership for %pM, vid %d to gw %pM\n",
743 mac, batadv_print_vid(vid), backbone_gw->orig);
748 /* replace backbone_gw atomically and adjust reference counters */
749 spin_lock_bh(&claim->backbone_lock);
750 old_backbone_gw = claim->backbone_gw;
751 kref_get(&backbone_gw->refcount);
752 claim->backbone_gw = backbone_gw;
753 spin_unlock_bh(&claim->backbone_lock);
756 /* remove claim address from old backbone_gw */
757 spin_lock_bh(&old_backbone_gw->crc_lock);
758 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
759 spin_unlock_bh(&old_backbone_gw->crc_lock);
762 batadv_backbone_gw_put(old_backbone_gw);
764 /* add claim address to new backbone_gw */
765 spin_lock_bh(&backbone_gw->crc_lock);
766 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
767 spin_unlock_bh(&backbone_gw->crc_lock);
768 backbone_gw->lasttime = jiffies;
771 batadv_claim_put(claim);
775 * batadv_bla_claim_get_backbone_gw - Get valid reference for backbone_gw of
777 * @claim: claim whose backbone_gw should be returned
779 * Return: valid reference to claim::backbone_gw
781 static struct batadv_bla_backbone_gw *
782 batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
784 struct batadv_bla_backbone_gw *backbone_gw;
786 spin_lock_bh(&claim->backbone_lock);
787 backbone_gw = claim->backbone_gw;
788 kref_get(&backbone_gw->refcount);
789 spin_unlock_bh(&claim->backbone_lock);
795 * batadv_bla_del_claim - delete a claim from the claim hash
796 * @bat_priv: the bat priv with all the soft interface information
797 * @mac: mac address of the claim to be removed
798 * @vid: VLAN id for the claim to be removed
800 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
801 const u8 *mac, const unsigned short vid)
803 struct batadv_bla_claim search_claim, *claim;
805 ether_addr_copy(search_claim.addr, mac);
806 search_claim.vid = vid;
807 claim = batadv_claim_hash_find(bat_priv, &search_claim);
811 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
812 mac, batadv_print_vid(vid));
814 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
815 batadv_choose_claim, claim);
816 batadv_claim_put(claim); /* reference from the hash is gone */
818 /* don't need the reference from hash_find() anymore */
819 batadv_claim_put(claim);
823 * batadv_handle_announce - check for ANNOUNCE frame
824 * @bat_priv: the bat priv with all the soft interface information
825 * @an_addr: announcement mac address (ARP Sender HW address)
826 * @backbone_addr: originator address of the sender (Ethernet source MAC)
827 * @vid: the VLAN ID of the frame
829 * Return: true if handled
831 static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
832 u8 *backbone_addr, unsigned short vid)
834 struct batadv_bla_backbone_gw *backbone_gw;
835 u16 backbone_crc, crc;
837 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
840 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
843 if (unlikely(!backbone_gw))
846 /* handle as ANNOUNCE frame */
847 backbone_gw->lasttime = jiffies;
848 crc = ntohs(*((__be16 *)(&an_addr[4])));
850 batadv_dbg(BATADV_DBG_BLA, bat_priv,
851 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
852 batadv_print_vid(vid), backbone_gw->orig, crc);
854 spin_lock_bh(&backbone_gw->crc_lock);
855 backbone_crc = backbone_gw->crc;
856 spin_unlock_bh(&backbone_gw->crc_lock);
858 if (backbone_crc != crc) {
859 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
860 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
862 batadv_print_vid(backbone_gw->vid),
865 batadv_bla_send_request(backbone_gw);
867 /* if we have sent a request and the crc was OK,
868 * we can allow traffic again.
870 if (atomic_read(&backbone_gw->request_sent)) {
871 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
872 atomic_set(&backbone_gw->request_sent, 0);
876 batadv_backbone_gw_put(backbone_gw);
881 * batadv_handle_request - check for REQUEST frame
882 * @bat_priv: the bat priv with all the soft interface information
883 * @primary_if: the primary hard interface of this batman soft interface
884 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
885 * @ethhdr: ethernet header of a packet
886 * @vid: the VLAN ID of the frame
888 * Return: true if handled
890 static bool batadv_handle_request(struct batadv_priv *bat_priv,
891 struct batadv_hard_iface *primary_if,
892 u8 *backbone_addr, struct ethhdr *ethhdr,
895 /* check for REQUEST frame */
896 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
899 /* sanity check, this should not happen on a normal switch,
900 * we ignore it in this case.
902 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
905 batadv_dbg(BATADV_DBG_BLA, bat_priv,
906 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
907 batadv_print_vid(vid), ethhdr->h_source);
909 batadv_bla_answer_request(bat_priv, primary_if, vid);
914 * batadv_handle_unclaim - check for UNCLAIM frame
915 * @bat_priv: the bat priv with all the soft interface information
916 * @primary_if: the primary hard interface of this batman soft interface
917 * @backbone_addr: originator address of the backbone (Ethernet source)
918 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
919 * @vid: the VLAN ID of the frame
921 * Return: true if handled
923 static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
924 struct batadv_hard_iface *primary_if,
925 u8 *backbone_addr, u8 *claim_addr,
928 struct batadv_bla_backbone_gw *backbone_gw;
930 /* unclaim in any case if it is our own */
931 if (primary_if && batadv_compare_eth(backbone_addr,
932 primary_if->net_dev->dev_addr))
933 batadv_bla_send_claim(bat_priv, claim_addr, vid,
934 BATADV_CLAIM_TYPE_UNCLAIM);
936 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
941 /* this must be an UNCLAIM frame */
942 batadv_dbg(BATADV_DBG_BLA, bat_priv,
943 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
944 claim_addr, batadv_print_vid(vid), backbone_gw->orig);
946 batadv_bla_del_claim(bat_priv, claim_addr, vid);
947 batadv_backbone_gw_put(backbone_gw);
952 * batadv_handle_claim - check for CLAIM frame
953 * @bat_priv: the bat priv with all the soft interface information
954 * @primary_if: the primary hard interface of this batman soft interface
955 * @backbone_addr: originator address of the backbone (Ethernet Source)
956 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
957 * @vid: the VLAN ID of the frame
959 * Return: true if handled
961 static bool batadv_handle_claim(struct batadv_priv *bat_priv,
962 struct batadv_hard_iface *primary_if,
963 u8 *backbone_addr, u8 *claim_addr,
966 struct batadv_bla_backbone_gw *backbone_gw;
968 /* register the gateway if not yet available, and add the claim. */
970 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
973 if (unlikely(!backbone_gw))
976 /* this must be a CLAIM frame */
977 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
978 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
979 batadv_bla_send_claim(bat_priv, claim_addr, vid,
980 BATADV_CLAIM_TYPE_CLAIM);
982 /* TODO: we could call something like tt_local_del() here. */
984 batadv_backbone_gw_put(backbone_gw);
989 * batadv_check_claim_group - check for claim group membership
990 * @bat_priv: the bat priv with all the soft interface information
991 * @primary_if: the primary interface of this batman interface
992 * @hw_src: the Hardware source in the ARP Header
993 * @hw_dst: the Hardware destination in the ARP Header
994 * @ethhdr: pointer to the Ethernet header of the claim frame
996 * checks if it is a claim packet and if its on the same group.
997 * This function also applies the group ID of the sender
998 * if it is in the same mesh.
1001 * 2 - if it is a claim packet and on the same group
1002 * 1 - if is a claim packet from another group
1003 * 0 - if it is not a claim packet
1005 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
1006 struct batadv_hard_iface *primary_if,
1007 u8 *hw_src, u8 *hw_dst,
1008 struct ethhdr *ethhdr)
1011 struct batadv_orig_node *orig_node;
1012 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1014 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1015 bla_dst_own = &bat_priv->bla.claim_dest;
1017 /* if announcement packet, use the source,
1018 * otherwise assume it is in the hw_src
1020 switch (bla_dst->type) {
1021 case BATADV_CLAIM_TYPE_CLAIM:
1022 backbone_addr = hw_src;
1024 case BATADV_CLAIM_TYPE_REQUEST:
1025 case BATADV_CLAIM_TYPE_ANNOUNCE:
1026 case BATADV_CLAIM_TYPE_UNCLAIM:
1027 backbone_addr = ethhdr->h_source;
1033 /* don't accept claim frames from ourselves */
1034 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
1037 /* if its already the same group, it is fine. */
1038 if (bla_dst->group == bla_dst_own->group)
1041 /* lets see if this originator is in our mesh */
1042 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
1044 /* dont accept claims from gateways which are not in
1045 * the same mesh or group.
1050 /* if our mesh friends mac is bigger, use it for ourselves. */
1051 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
1052 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1053 "taking other backbones claim group: %#.4x\n",
1054 ntohs(bla_dst->group));
1055 bla_dst_own->group = bla_dst->group;
1058 batadv_orig_node_put(orig_node);
1064 * batadv_bla_process_claim - Check if this is a claim frame, and process it
1065 * @bat_priv: the bat priv with all the soft interface information
1066 * @primary_if: the primary hard interface of this batman soft interface
1067 * @skb: the frame to be checked
1069 * Return: true if it was a claim frame, otherwise return false to
1070 * tell the callee that it can use the frame on its own.
1072 static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1073 struct batadv_hard_iface *primary_if,
1074 struct sk_buff *skb)
1076 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1077 u8 *hw_src, *hw_dst;
1078 struct vlan_hdr *vhdr, vhdr_buf;
1079 struct ethhdr *ethhdr;
1080 struct arphdr *arphdr;
1087 vid = batadv_get_vid(skb, 0);
1088 ethhdr = eth_hdr(skb);
1090 proto = ethhdr->h_proto;
1092 if (vid & BATADV_VLAN_HAS_TAG) {
1093 /* Traverse the VLAN/Ethertypes.
1095 * At this point it is known that the first protocol is a VLAN
1096 * header, so start checking at the encapsulated protocol.
1098 * The depth of the VLAN headers is recorded to drop BLA claim
1099 * frames encapsulated into multiple VLAN headers (QinQ).
1102 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1107 proto = vhdr->h_vlan_encapsulated_proto;
1108 headlen += VLAN_HLEN;
1110 } while (proto == htons(ETH_P_8021Q));
1113 if (proto != htons(ETH_P_ARP))
1114 return false; /* not a claim frame */
1116 /* this must be a ARP frame. check if it is a claim. */
1118 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1121 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
1122 ethhdr = eth_hdr(skb);
1123 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
1125 /* Check whether the ARP frame carries a valid
1128 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1130 if (arphdr->ar_pro != htons(ETH_P_IP))
1132 if (arphdr->ar_hln != ETH_ALEN)
1134 if (arphdr->ar_pln != 4)
1137 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
1138 hw_dst = hw_src + ETH_ALEN + 4;
1139 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1140 bla_dst_own = &bat_priv->bla.claim_dest;
1142 /* check if it is a claim frame in general */
1143 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1144 sizeof(bla_dst->magic)) != 0)
1147 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1148 * drop that, as this is not supported by BLA but should also not be
1149 * sent via the mesh.
1154 /* Let the loopdetect frames on the mesh in any case. */
1155 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
1158 /* check if it is a claim frame. */
1159 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1162 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1163 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1164 ethhdr->h_source, batadv_print_vid(vid), hw_src,
1170 /* become a backbone gw ourselves on this vlan if not happened yet */
1171 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1173 /* check for the different types of claim frames ... */
1174 switch (bla_dst->type) {
1175 case BATADV_CLAIM_TYPE_CLAIM:
1176 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1177 ethhdr->h_source, vid))
1180 case BATADV_CLAIM_TYPE_UNCLAIM:
1181 if (batadv_handle_unclaim(bat_priv, primary_if,
1182 ethhdr->h_source, hw_src, vid))
1186 case BATADV_CLAIM_TYPE_ANNOUNCE:
1187 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1191 case BATADV_CLAIM_TYPE_REQUEST:
1192 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1198 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1199 "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",
1200 ethhdr->h_source, batadv_print_vid(vid), hw_src, hw_dst);
1205 * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or
1207 * @bat_priv: the bat priv with all the soft interface information
1208 * @now: whether the whole hash shall be wiped now
1210 * Check when we last heard from other nodes, and remove them in case of
1211 * a time out, or clean all backbone gws if now is set.
1213 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1215 struct batadv_bla_backbone_gw *backbone_gw;
1216 struct hlist_node *node_tmp;
1217 struct hlist_head *head;
1218 struct batadv_hashtable *hash;
1219 spinlock_t *list_lock; /* protects write access to the hash lists */
1222 hash = bat_priv->bla.backbone_hash;
1226 for (i = 0; i < hash->size; i++) {
1227 head = &hash->table[i];
1228 list_lock = &hash->list_locks[i];
1230 spin_lock_bh(list_lock);
1231 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1235 if (!batadv_has_timed_out(backbone_gw->lasttime,
1236 BATADV_BLA_BACKBONE_TIMEOUT))
1239 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1240 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1244 /* don't wait for the pending request anymore */
1245 if (atomic_read(&backbone_gw->request_sent))
1246 atomic_dec(&bat_priv->bla.num_requests);
1248 batadv_bla_del_backbone_claims(backbone_gw);
1250 hlist_del_rcu(&backbone_gw->hash_entry);
1251 batadv_backbone_gw_put(backbone_gw);
1253 spin_unlock_bh(list_lock);
1258 * batadv_bla_purge_claims - Remove claims after a timeout or immediately
1259 * @bat_priv: the bat priv with all the soft interface information
1260 * @primary_if: the selected primary interface, may be NULL if now is set
1261 * @now: whether the whole hash shall be wiped now
1263 * Check when we heard last time from our own claims, and remove them in case of
1264 * a time out, or clean all claims if now is set
1266 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1267 struct batadv_hard_iface *primary_if,
1270 struct batadv_bla_backbone_gw *backbone_gw;
1271 struct batadv_bla_claim *claim;
1272 struct hlist_head *head;
1273 struct batadv_hashtable *hash;
1276 hash = bat_priv->bla.claim_hash;
1280 for (i = 0; i < hash->size; i++) {
1281 head = &hash->table[i];
1284 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1285 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1289 if (!batadv_compare_eth(backbone_gw->orig,
1290 primary_if->net_dev->dev_addr))
1293 if (!batadv_has_timed_out(claim->lasttime,
1294 BATADV_BLA_CLAIM_TIMEOUT))
1297 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1298 "bla_purge_claims(): timed out.\n");
1301 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1302 "bla_purge_claims(): %pM, vid %d\n",
1303 claim->addr, claim->vid);
1305 batadv_handle_unclaim(bat_priv, primary_if,
1307 claim->addr, claim->vid);
1309 batadv_backbone_gw_put(backbone_gw);
1316 * batadv_bla_update_orig_address - Update the backbone gateways when the own
1317 * originator address changes
1318 * @bat_priv: the bat priv with all the soft interface information
1319 * @primary_if: the new selected primary_if
1320 * @oldif: the old primary interface, may be NULL
1322 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1323 struct batadv_hard_iface *primary_if,
1324 struct batadv_hard_iface *oldif)
1326 struct batadv_bla_backbone_gw *backbone_gw;
1327 struct hlist_head *head;
1328 struct batadv_hashtable *hash;
1332 /* reset bridge loop avoidance group id */
1333 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1334 bat_priv->bla.claim_dest.group = group;
1336 /* purge everything when bridge loop avoidance is turned off */
1337 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1341 batadv_bla_purge_claims(bat_priv, NULL, 1);
1342 batadv_bla_purge_backbone_gw(bat_priv, 1);
1346 hash = bat_priv->bla.backbone_hash;
1350 for (i = 0; i < hash->size; i++) {
1351 head = &hash->table[i];
1354 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1355 /* own orig still holds the old value. */
1356 if (!batadv_compare_eth(backbone_gw->orig,
1357 oldif->net_dev->dev_addr))
1360 ether_addr_copy(backbone_gw->orig,
1361 primary_if->net_dev->dev_addr);
1362 /* send an announce frame so others will ask for our
1363 * claims and update their tables.
1365 batadv_bla_send_announce(bat_priv, backbone_gw);
1372 * batadv_bla_send_loopdetect - send a loopdetect frame
1373 * @bat_priv: the bat priv with all the soft interface information
1374 * @backbone_gw: the backbone gateway for which a loop should be detected
1376 * To detect loops that the bridge loop avoidance can't handle, send a loop
1377 * detection packet on the backbone. Unlike other BLA frames, this frame will
1378 * be allowed on the mesh by other nodes. If it is received on the mesh, this
1379 * indicates that there is a loop.
1382 batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1383 struct batadv_bla_backbone_gw *backbone_gw)
1385 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1387 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1388 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1392 * batadv_bla_status_update - purge bla interfaces if necessary
1393 * @net_dev: the soft interface net device
1395 void batadv_bla_status_update(struct net_device *net_dev)
1397 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1398 struct batadv_hard_iface *primary_if;
1400 primary_if = batadv_primary_if_get_selected(bat_priv);
1404 /* this function already purges everything when bla is disabled,
1405 * so just call that one.
1407 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1408 batadv_hardif_put(primary_if);
1412 * batadv_bla_periodic_work - performs periodic bla work
1413 * @work: kernel work struct
1415 * periodic work to do:
1416 * * purge structures when they are too old
1417 * * send announcements
1419 static void batadv_bla_periodic_work(struct work_struct *work)
1421 struct delayed_work *delayed_work;
1422 struct batadv_priv *bat_priv;
1423 struct batadv_priv_bla *priv_bla;
1424 struct hlist_head *head;
1425 struct batadv_bla_backbone_gw *backbone_gw;
1426 struct batadv_hashtable *hash;
1427 struct batadv_hard_iface *primary_if;
1428 bool send_loopdetect = false;
1431 delayed_work = to_delayed_work(work);
1432 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1433 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1434 primary_if = batadv_primary_if_get_selected(bat_priv);
1438 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1439 batadv_bla_purge_backbone_gw(bat_priv, 0);
1441 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1444 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1445 /* set a new random mac address for the next bridge loop
1446 * detection frames. Set the locally administered bit to avoid
1447 * collisions with users mac addresses.
1449 random_ether_addr(bat_priv->bla.loopdetect_addr);
1450 bat_priv->bla.loopdetect_addr[0] = 0xba;
1451 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1452 bat_priv->bla.loopdetect_lasttime = jiffies;
1453 atomic_set(&bat_priv->bla.loopdetect_next,
1454 BATADV_BLA_LOOPDETECT_PERIODS);
1456 /* mark for sending loop detect on all VLANs */
1457 send_loopdetect = true;
1460 hash = bat_priv->bla.backbone_hash;
1464 for (i = 0; i < hash->size; i++) {
1465 head = &hash->table[i];
1468 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1469 if (!batadv_compare_eth(backbone_gw->orig,
1470 primary_if->net_dev->dev_addr))
1473 backbone_gw->lasttime = jiffies;
1475 batadv_bla_send_announce(bat_priv, backbone_gw);
1476 if (send_loopdetect)
1477 batadv_bla_send_loopdetect(bat_priv,
1480 /* request_sent is only set after creation to avoid
1481 * problems when we are not yet known as backbone gw
1484 * We can reset this now after we waited some periods
1485 * to give bridge forward delays and bla group forming
1489 if (atomic_read(&backbone_gw->request_sent) == 0)
1492 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1495 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1496 atomic_set(&backbone_gw->request_sent, 0);
1502 batadv_hardif_put(primary_if);
1504 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1505 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1508 /* The hash for claim and backbone hash receive the same key because they
1509 * are getting initialized by hash_new with the same key. Reinitializing
1510 * them with to different keys to allow nested locking without generating
1513 static struct lock_class_key batadv_claim_hash_lock_class_key;
1514 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1517 * batadv_bla_init - initialize all bla structures
1518 * @bat_priv: the bat priv with all the soft interface information
1520 * Return: 0 on success, < 0 on error.
1522 int batadv_bla_init(struct batadv_priv *bat_priv)
1525 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1526 struct batadv_hard_iface *primary_if;
1528 unsigned long entrytime;
1530 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1532 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1534 /* setting claim destination address */
1535 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1536 bat_priv->bla.claim_dest.type = 0;
1537 primary_if = batadv_primary_if_get_selected(bat_priv);
1539 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1540 bat_priv->bla.claim_dest.group = htons(crc);
1541 batadv_hardif_put(primary_if);
1543 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1546 /* initialize the duplicate list */
1547 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1548 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1549 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1550 bat_priv->bla.bcast_duplist_curr = 0;
1552 atomic_set(&bat_priv->bla.loopdetect_next,
1553 BATADV_BLA_LOOPDETECT_PERIODS);
1555 if (bat_priv->bla.claim_hash)
1558 bat_priv->bla.claim_hash = batadv_hash_new(128);
1559 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1561 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1564 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1565 &batadv_claim_hash_lock_class_key);
1566 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1567 &batadv_backbone_hash_lock_class_key);
1569 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1571 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1573 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1574 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1579 * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup.
1580 * @bat_priv: the bat priv with all the soft interface information
1581 * @skb: contains the bcast_packet to be checked
1583 * check if it is on our broadcast list. Another gateway might
1584 * have sent the same packet because it is connected to the same backbone,
1585 * so we have to remove this duplicate.
1587 * This is performed by checking the CRC, which will tell us
1588 * with a good chance that it is the same packet. If it is furthermore
1589 * sent by another host, drop it. We allow equal packets from
1590 * the same host however as this might be intended.
1592 * Return: true if a packet is in the duplicate list, false otherwise.
1594 bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1595 struct sk_buff *skb)
1599 struct batadv_bcast_packet *bcast_packet;
1600 struct batadv_bcast_duplist_entry *entry;
1603 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1605 /* calculate the crc ... */
1606 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1608 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1610 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1611 curr = (bat_priv->bla.bcast_duplist_curr + i);
1612 curr %= BATADV_DUPLIST_SIZE;
1613 entry = &bat_priv->bla.bcast_duplist[curr];
1615 /* we can stop searching if the entry is too old ;
1616 * later entries will be even older
1618 if (batadv_has_timed_out(entry->entrytime,
1619 BATADV_DUPLIST_TIMEOUT))
1622 if (entry->crc != crc)
1625 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1628 /* this entry seems to match: same crc, not too old,
1629 * and from another gw. therefore return true to forbid it.
1634 /* not found, add a new entry (overwrite the oldest entry)
1635 * and allow it, its the first occurrence.
1637 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1638 curr %= BATADV_DUPLIST_SIZE;
1639 entry = &bat_priv->bla.bcast_duplist[curr];
1641 entry->entrytime = jiffies;
1642 ether_addr_copy(entry->orig, bcast_packet->orig);
1643 bat_priv->bla.bcast_duplist_curr = curr;
1646 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1652 * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for
1653 * the VLAN identified by vid.
1654 * @bat_priv: the bat priv with all the soft interface information
1655 * @orig: originator mac address
1656 * @vid: VLAN identifier
1658 * Return: true if orig is a backbone for this vid, false otherwise.
1660 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1663 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1664 struct hlist_head *head;
1665 struct batadv_bla_backbone_gw *backbone_gw;
1668 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1674 for (i = 0; i < hash->size; i++) {
1675 head = &hash->table[i];
1678 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1679 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1680 backbone_gw->vid == vid) {
1692 * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN.
1693 * @skb: the frame to be checked
1694 * @orig_node: the orig_node of the frame
1695 * @hdr_size: maximum length of the frame
1697 * Return: true if the orig_node is also a gateway on the soft interface,
1698 * otherwise it returns false.
1700 bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1701 struct batadv_orig_node *orig_node, int hdr_size)
1703 struct batadv_bla_backbone_gw *backbone_gw;
1706 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1709 /* first, find out the vid. */
1710 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1713 vid = batadv_get_vid(skb, hdr_size);
1715 /* see if this originator is a backbone gw for this VLAN */
1716 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1717 orig_node->orig, vid);
1721 batadv_backbone_gw_put(backbone_gw);
1726 * batadv_bla_free - free all bla structures
1727 * @bat_priv: the bat priv with all the soft interface information
1729 * for softinterface free or module unload
1731 void batadv_bla_free(struct batadv_priv *bat_priv)
1733 struct batadv_hard_iface *primary_if;
1735 cancel_delayed_work_sync(&bat_priv->bla.work);
1736 primary_if = batadv_primary_if_get_selected(bat_priv);
1738 if (bat_priv->bla.claim_hash) {
1739 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1740 batadv_hash_destroy(bat_priv->bla.claim_hash);
1741 bat_priv->bla.claim_hash = NULL;
1743 if (bat_priv->bla.backbone_hash) {
1744 batadv_bla_purge_backbone_gw(bat_priv, 1);
1745 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1746 bat_priv->bla.backbone_hash = NULL;
1749 batadv_hardif_put(primary_if);
1753 * batadv_bla_loopdetect_check - check and handle a detected loop
1754 * @bat_priv: the bat priv with all the soft interface information
1755 * @skb: the packet to check
1756 * @primary_if: interface where the request came on
1757 * @vid: the VLAN ID of the frame
1759 * Checks if this packet is a loop detect frame which has been sent by us,
1760 * throw an uevent and log the event if that is the case.
1762 * Return: true if it is a loop detect frame which is to be dropped, false
1766 batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1767 struct batadv_hard_iface *primary_if,
1770 struct batadv_bla_backbone_gw *backbone_gw;
1771 struct ethhdr *ethhdr;
1773 ethhdr = eth_hdr(skb);
1775 /* Only check for the MAC address and skip more checks here for
1776 * performance reasons - this function is on the hotpath, after all.
1778 if (!batadv_compare_eth(ethhdr->h_source,
1779 bat_priv->bla.loopdetect_addr))
1782 /* If the packet came too late, don't forward it on the mesh
1783 * but don't consider that as loop. It might be a coincidence.
1785 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1786 BATADV_BLA_LOOPDETECT_TIMEOUT))
1789 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1790 primary_if->net_dev->dev_addr,
1792 if (unlikely(!backbone_gw))
1795 queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1796 /* backbone_gw is unreferenced in the report work function function */
1802 * batadv_bla_rx - check packets coming from the mesh.
1803 * @bat_priv: the bat priv with all the soft interface information
1804 * @skb: the frame to be checked
1805 * @vid: the VLAN ID of the frame
1806 * @is_bcast: the packet came in a broadcast packet type.
1808 * batadv_bla_rx avoidance checks if:
1809 * * we have to race for a claim
1810 * * if the frame is allowed on the LAN
1812 * in these cases, the skb is further handled by this function
1814 * Return: true if handled, otherwise it returns false and the caller shall
1815 * further process the skb.
1817 bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1818 unsigned short vid, bool is_bcast)
1820 struct batadv_bla_backbone_gw *backbone_gw;
1821 struct ethhdr *ethhdr;
1822 struct batadv_bla_claim search_claim, *claim = NULL;
1823 struct batadv_hard_iface *primary_if;
1827 ethhdr = eth_hdr(skb);
1829 primary_if = batadv_primary_if_get_selected(bat_priv);
1833 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1836 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1839 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1840 /* don't allow broadcasts while requests are in flight */
1841 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1844 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1845 search_claim.vid = vid;
1846 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1849 /* possible optimization: race for a claim */
1850 /* No claim exists yet, claim it for us!
1853 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1854 "bla_rx(): Unclaimed MAC %pM found. Claim it. Local: %s\n",
1856 batadv_is_my_client(bat_priv,
1857 ethhdr->h_source, vid) ?
1859 batadv_handle_claim(bat_priv, primary_if,
1860 primary_if->net_dev->dev_addr,
1861 ethhdr->h_source, vid);
1865 /* if it is our own claim ... */
1866 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1867 own_claim = batadv_compare_eth(backbone_gw->orig,
1868 primary_if->net_dev->dev_addr);
1869 batadv_backbone_gw_put(backbone_gw);
1872 /* ... allow it in any case */
1873 claim->lasttime = jiffies;
1877 /* if it is a broadcast ... */
1878 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1879 /* ... drop it. the responsible gateway is in charge.
1881 * We need to check is_bcast because with the gateway
1882 * feature, broadcasts (like DHCP requests) may be sent
1883 * using a unicast packet type.
1887 /* seems the client considers us as its best gateway.
1888 * send a claim and update the claim table
1891 batadv_handle_claim(bat_priv, primary_if,
1892 primary_if->net_dev->dev_addr,
1893 ethhdr->h_source, vid);
1897 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1907 batadv_hardif_put(primary_if);
1909 batadv_claim_put(claim);
1914 * batadv_bla_tx - check packets going into the mesh
1915 * @bat_priv: the bat priv with all the soft interface information
1916 * @skb: the frame to be checked
1917 * @vid: the VLAN ID of the frame
1919 * batadv_bla_tx checks if:
1920 * * a claim was received which has to be processed
1921 * * the frame is allowed on the mesh
1923 * in these cases, the skb is further handled by this function.
1925 * This call might reallocate skb data.
1927 * Return: true if handled, otherwise it returns false and the caller shall
1928 * further process the skb.
1930 bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1933 struct ethhdr *ethhdr;
1934 struct batadv_bla_claim search_claim, *claim = NULL;
1935 struct batadv_bla_backbone_gw *backbone_gw;
1936 struct batadv_hard_iface *primary_if;
1940 primary_if = batadv_primary_if_get_selected(bat_priv);
1944 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1947 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1950 ethhdr = eth_hdr(skb);
1952 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1953 /* don't allow broadcasts while requests are in flight */
1954 if (is_multicast_ether_addr(ethhdr->h_dest))
1957 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1958 search_claim.vid = vid;
1960 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1962 /* if no claim exists, allow it. */
1966 /* check if we are responsible. */
1967 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1968 client_roamed = batadv_compare_eth(backbone_gw->orig,
1969 primary_if->net_dev->dev_addr);
1970 batadv_backbone_gw_put(backbone_gw);
1972 if (client_roamed) {
1973 /* if yes, the client has roamed and we have
1976 if (batadv_has_timed_out(claim->lasttime, 100)) {
1977 /* only unclaim if the last claim entry is
1978 * older than 100 ms to make sure we really
1979 * have a roaming client here.
1981 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_tx(): Roaming client %pM detected. Unclaim it.\n",
1983 batadv_handle_unclaim(bat_priv, primary_if,
1984 primary_if->net_dev->dev_addr,
1985 ethhdr->h_source, vid);
1988 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_tx(): Race for claim %pM detected. Drop packet.\n",
1994 /* check if it is a multicast/broadcast frame */
1995 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1996 /* drop it. the responsible gateway has forwarded it into
1997 * the backbone network.
2001 /* we must allow it. at least if we are
2002 * responsible for the DESTINATION.
2007 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
2014 batadv_hardif_put(primary_if);
2016 batadv_claim_put(claim);
2020 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2022 * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file
2023 * @seq: seq file to print on
2028 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
2030 struct net_device *net_dev = (struct net_device *)seq->private;
2031 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2032 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
2033 struct batadv_bla_backbone_gw *backbone_gw;
2034 struct batadv_bla_claim *claim;
2035 struct batadv_hard_iface *primary_if;
2036 struct hlist_head *head;
2042 primary_if = batadv_seq_print_text_primary_if_get(seq);
2046 primary_addr = primary_if->net_dev->dev_addr;
2048 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
2049 net_dev->name, primary_addr,
2050 ntohs(bat_priv->bla.claim_dest.group));
2052 " Client VID Originator [o] (CRC )\n");
2053 for (i = 0; i < hash->size; i++) {
2054 head = &hash->table[i];
2057 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2058 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
2060 is_own = batadv_compare_eth(backbone_gw->orig,
2063 spin_lock_bh(&backbone_gw->crc_lock);
2064 backbone_crc = backbone_gw->crc;
2065 spin_unlock_bh(&backbone_gw->crc_lock);
2066 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
2067 claim->addr, batadv_print_vid(claim->vid),
2069 (is_own ? 'x' : ' '),
2072 batadv_backbone_gw_put(backbone_gw);
2078 batadv_hardif_put(primary_if);
2084 * batadv_bla_claim_dump_entry - dump one entry of the claim table
2085 * to a netlink socket
2086 * @msg: buffer for the message
2087 * @portid: netlink port
2088 * @seq: Sequence number of netlink message
2089 * @primary_if: primary interface
2090 * @claim: entry to dump
2092 * Return: 0 or error code.
2095 batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2096 struct batadv_hard_iface *primary_if,
2097 struct batadv_bla_claim *claim)
2099 u8 *primary_addr = primary_if->net_dev->dev_addr;
2105 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2106 NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
2112 is_own = batadv_compare_eth(claim->backbone_gw->orig,
2115 spin_lock_bh(&claim->backbone_gw->crc_lock);
2116 backbone_crc = claim->backbone_gw->crc;
2117 spin_unlock_bh(&claim->backbone_gw->crc_lock);
2120 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2121 genlmsg_cancel(msg, hdr);
2125 if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
2126 nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
2127 nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2128 claim->backbone_gw->orig) ||
2129 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2131 genlmsg_cancel(msg, hdr);
2135 genlmsg_end(msg, hdr);
2143 * batadv_bla_claim_dump_bucket - dump one bucket of the claim table
2144 * to a netlink socket
2145 * @msg: buffer for the message
2146 * @portid: netlink port
2147 * @seq: Sequence number of netlink message
2148 * @primary_if: primary interface
2149 * @head: bucket to dump
2150 * @idx_skip: How many entries to skip
2155 batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2156 struct batadv_hard_iface *primary_if,
2157 struct hlist_head *head, int *idx_skip)
2159 struct batadv_bla_claim *claim;
2163 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2164 if (idx++ < *idx_skip)
2166 if (batadv_bla_claim_dump_entry(msg, portid, seq,
2167 primary_if, claim)) {
2168 *idx_skip = idx - 1;
2180 * batadv_bla_claim_dump - dump claim table to a netlink socket
2181 * @msg: buffer for the message
2182 * @cb: callback structure containing arguments
2184 * Return: message length.
2186 int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
2188 struct batadv_hard_iface *primary_if = NULL;
2189 int portid = NETLINK_CB(cb->skb).portid;
2190 struct net *net = sock_net(cb->skb->sk);
2191 struct net_device *soft_iface;
2192 struct batadv_hashtable *hash;
2193 struct batadv_priv *bat_priv;
2194 int bucket = cb->args[0];
2195 struct hlist_head *head;
2196 int idx = cb->args[1];
2200 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2201 BATADV_ATTR_MESH_IFINDEX);
2205 soft_iface = dev_get_by_index(net, ifindex);
2206 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2211 bat_priv = netdev_priv(soft_iface);
2212 hash = bat_priv->bla.claim_hash;
2214 primary_if = batadv_primary_if_get_selected(bat_priv);
2215 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2220 while (bucket < hash->size) {
2221 head = &hash->table[bucket];
2223 if (batadv_bla_claim_dump_bucket(msg, portid,
2225 primary_if, head, &idx))
2230 cb->args[0] = bucket;
2237 batadv_hardif_put(primary_if);
2240 dev_put(soft_iface);
2245 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2247 * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq
2249 * @seq: seq file to print on
2254 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
2256 struct net_device *net_dev = (struct net_device *)seq->private;
2257 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2258 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
2259 struct batadv_bla_backbone_gw *backbone_gw;
2260 struct batadv_hard_iface *primary_if;
2261 struct hlist_head *head;
2268 primary_if = batadv_seq_print_text_primary_if_get(seq);
2272 primary_addr = primary_if->net_dev->dev_addr;
2274 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
2275 net_dev->name, primary_addr,
2276 ntohs(bat_priv->bla.claim_dest.group));
2277 seq_puts(seq, " Originator VID last seen (CRC )\n");
2278 for (i = 0; i < hash->size; i++) {
2279 head = &hash->table[i];
2282 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2283 msecs = jiffies_to_msecs(jiffies -
2284 backbone_gw->lasttime);
2285 secs = msecs / 1000;
2286 msecs = msecs % 1000;
2288 is_own = batadv_compare_eth(backbone_gw->orig,
2293 spin_lock_bh(&backbone_gw->crc_lock);
2294 backbone_crc = backbone_gw->crc;
2295 spin_unlock_bh(&backbone_gw->crc_lock);
2297 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
2299 batadv_print_vid(backbone_gw->vid), secs,
2300 msecs, backbone_crc);
2306 batadv_hardif_put(primary_if);
2312 * batadv_bla_backbone_dump_entry - dump one entry of the backbone table
2313 * to a netlink socket
2314 * @msg: buffer for the message
2315 * @portid: netlink port
2316 * @seq: Sequence number of netlink message
2317 * @primary_if: primary interface
2318 * @backbone_gw: entry to dump
2320 * Return: 0 or error code.
2323 batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2324 struct batadv_hard_iface *primary_if,
2325 struct batadv_bla_backbone_gw *backbone_gw)
2327 u8 *primary_addr = primary_if->net_dev->dev_addr;
2334 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2335 NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
2341 is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
2343 spin_lock_bh(&backbone_gw->crc_lock);
2344 backbone_crc = backbone_gw->crc;
2345 spin_unlock_bh(&backbone_gw->crc_lock);
2347 msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
2350 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2351 genlmsg_cancel(msg, hdr);
2355 if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2356 backbone_gw->orig) ||
2357 nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
2358 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2360 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
2361 genlmsg_cancel(msg, hdr);
2365 genlmsg_end(msg, hdr);
2373 * batadv_bla_backbone_dump_bucket - dump one bucket of the backbone table
2374 * to a netlink socket
2375 * @msg: buffer for the message
2376 * @portid: netlink port
2377 * @seq: Sequence number of netlink message
2378 * @primary_if: primary interface
2379 * @head: bucket to dump
2380 * @idx_skip: How many entries to skip
2385 batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2386 struct batadv_hard_iface *primary_if,
2387 struct hlist_head *head, int *idx_skip)
2389 struct batadv_bla_backbone_gw *backbone_gw;
2393 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2394 if (idx++ < *idx_skip)
2396 if (batadv_bla_backbone_dump_entry(msg, portid, seq,
2397 primary_if, backbone_gw)) {
2398 *idx_skip = idx - 1;
2410 * batadv_bla_backbone_dump - dump backbone table to a netlink socket
2411 * @msg: buffer for the message
2412 * @cb: callback structure containing arguments
2414 * Return: message length.
2416 int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
2418 struct batadv_hard_iface *primary_if = NULL;
2419 int portid = NETLINK_CB(cb->skb).portid;
2420 struct net *net = sock_net(cb->skb->sk);
2421 struct net_device *soft_iface;
2422 struct batadv_hashtable *hash;
2423 struct batadv_priv *bat_priv;
2424 int bucket = cb->args[0];
2425 struct hlist_head *head;
2426 int idx = cb->args[1];
2430 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2431 BATADV_ATTR_MESH_IFINDEX);
2435 soft_iface = dev_get_by_index(net, ifindex);
2436 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2441 bat_priv = netdev_priv(soft_iface);
2442 hash = bat_priv->bla.backbone_hash;
2444 primary_if = batadv_primary_if_get_selected(bat_priv);
2445 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2450 while (bucket < hash->size) {
2451 head = &hash->table[bucket];
2453 if (batadv_bla_backbone_dump_bucket(msg, portid,
2455 primary_if, head, &idx))
2460 cb->args[0] = bucket;
2467 batadv_hardif_put(primary_if);
2470 dev_put(soft_iface);
2475 #ifdef CONFIG_BATMAN_ADV_DAT
2477 * batadv_bla_check_claim - check if address is claimed
2479 * @bat_priv: the bat priv with all the soft interface information
2480 * @addr: mac address of which the claim status is checked
2483 * addr is checked if this address is claimed by the local device itself.
2485 * Return: true if bla is disabled or the mac is claimed by the device,
2486 * false if the device addr is already claimed by another gateway
2488 bool batadv_bla_check_claim(struct batadv_priv *bat_priv,
2489 u8 *addr, unsigned short vid)
2491 struct batadv_bla_claim search_claim;
2492 struct batadv_bla_claim *claim = NULL;
2493 struct batadv_hard_iface *primary_if = NULL;
2496 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
2499 primary_if = batadv_primary_if_get_selected(bat_priv);
2503 /* First look if the mac address is claimed */
2504 ether_addr_copy(search_claim.addr, addr);
2505 search_claim.vid = vid;
2507 claim = batadv_claim_hash_find(bat_priv, &search_claim);
2509 /* If there is a claim and we are not owner of the claim,
2513 if (!batadv_compare_eth(claim->backbone_gw->orig,
2514 primary_if->net_dev->dev_addr))
2516 batadv_claim_put(claim);
2519 batadv_hardif_put(primary_if);