1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) B.A.T.M.A.N. contributors:
7 #include "bridge_loop_avoidance.h"
10 #include <linux/atomic.h>
11 #include <linux/byteorder/generic.h>
12 #include <linux/compiler.h>
13 #include <linux/crc16.h>
14 #include <linux/errno.h>
15 #include <linux/etherdevice.h>
16 #include <linux/gfp.h>
17 #include <linux/if_arp.h>
18 #include <linux/if_ether.h>
19 #include <linux/if_vlan.h>
20 #include <linux/jhash.h>
21 #include <linux/jiffies.h>
22 #include <linux/kernel.h>
23 #include <linux/kref.h>
24 #include <linux/list.h>
25 #include <linux/lockdep.h>
26 #include <linux/netdevice.h>
27 #include <linux/netlink.h>
28 #include <linux/rculist.h>
29 #include <linux/rcupdate.h>
30 #include <linux/skbuff.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/stddef.h>
34 #include <linux/string.h>
35 #include <linux/workqueue.h>
37 #include <net/genetlink.h>
38 #include <net/netlink.h>
40 #include <uapi/linux/batadv_packet.h>
41 #include <uapi/linux/batman_adv.h>
43 #include "hard-interface.h"
47 #include "originator.h"
48 #include "soft-interface.h"
49 #include "translation-table.h"
51 static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
53 static void batadv_bla_periodic_work(struct work_struct *work);
55 batadv_bla_send_announce(struct batadv_priv *bat_priv,
56 struct batadv_bla_backbone_gw *backbone_gw);
59 * batadv_choose_claim() - choose the right bucket for a claim.
61 * @size: size of the hash table
63 * Return: the hash index of the claim
65 static inline u32 batadv_choose_claim(const void *data, u32 size)
67 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
70 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
71 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
77 * batadv_choose_backbone_gw() - choose the right bucket for a backbone gateway.
79 * @size: size of the hash table
81 * Return: the hash index of the backbone gateway
83 static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
85 const struct batadv_bla_backbone_gw *gw;
88 gw = (struct batadv_bla_backbone_gw *)data;
89 hash = jhash(&gw->orig, sizeof(gw->orig), hash);
90 hash = jhash(&gw->vid, sizeof(gw->vid), hash);
96 * batadv_compare_backbone_gw() - compare address and vid of two backbone gws
97 * @node: list node of the first entry to compare
98 * @data2: pointer to the second backbone gateway
100 * Return: true if the backbones have the same data, false otherwise
102 static bool batadv_compare_backbone_gw(const struct hlist_node *node,
105 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
107 const struct batadv_bla_backbone_gw *gw1 = data1;
108 const struct batadv_bla_backbone_gw *gw2 = data2;
110 if (!batadv_compare_eth(gw1->orig, gw2->orig))
113 if (gw1->vid != gw2->vid)
120 * batadv_compare_claim() - compare address and vid of two claims
121 * @node: list node of the first entry to compare
122 * @data2: pointer to the second claims
124 * Return: true if the claim have the same data, 0 otherwise
126 static bool batadv_compare_claim(const struct hlist_node *node,
129 const void *data1 = container_of(node, struct batadv_bla_claim,
131 const struct batadv_bla_claim *cl1 = data1;
132 const struct batadv_bla_claim *cl2 = data2;
134 if (!batadv_compare_eth(cl1->addr, cl2->addr))
137 if (cl1->vid != cl2->vid)
144 * batadv_backbone_gw_release() - release backbone gw from lists and queue for
145 * free after rcu grace period
146 * @ref: kref pointer of the backbone gw
148 static void batadv_backbone_gw_release(struct kref *ref)
150 struct batadv_bla_backbone_gw *backbone_gw;
152 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
155 kfree_rcu(backbone_gw, rcu);
159 * batadv_backbone_gw_put() - decrement the backbone gw refcounter and possibly
161 * @backbone_gw: backbone gateway to be free'd
163 static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
168 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
172 * batadv_claim_release() - release claim from lists and queue for free after
174 * @ref: kref pointer of the claim
176 static void batadv_claim_release(struct kref *ref)
178 struct batadv_bla_claim *claim;
179 struct batadv_bla_backbone_gw *old_backbone_gw;
181 claim = container_of(ref, struct batadv_bla_claim, refcount);
183 spin_lock_bh(&claim->backbone_lock);
184 old_backbone_gw = claim->backbone_gw;
185 claim->backbone_gw = NULL;
186 spin_unlock_bh(&claim->backbone_lock);
188 spin_lock_bh(&old_backbone_gw->crc_lock);
189 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
190 spin_unlock_bh(&old_backbone_gw->crc_lock);
192 batadv_backbone_gw_put(old_backbone_gw);
194 kfree_rcu(claim, rcu);
198 * batadv_claim_put() - decrement the claim refcounter and possibly release it
199 * @claim: claim to be free'd
201 static void batadv_claim_put(struct batadv_bla_claim *claim)
206 kref_put(&claim->refcount, batadv_claim_release);
210 * batadv_claim_hash_find() - looks for a claim in the claim hash
211 * @bat_priv: the bat priv with all the soft interface information
212 * @data: search data (may be local/static data)
214 * Return: claim if found or NULL otherwise.
216 static struct batadv_bla_claim *
217 batadv_claim_hash_find(struct batadv_priv *bat_priv,
218 struct batadv_bla_claim *data)
220 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
221 struct hlist_head *head;
222 struct batadv_bla_claim *claim;
223 struct batadv_bla_claim *claim_tmp = NULL;
229 index = batadv_choose_claim(data, hash->size);
230 head = &hash->table[index];
233 hlist_for_each_entry_rcu(claim, head, hash_entry) {
234 if (!batadv_compare_claim(&claim->hash_entry, data))
237 if (!kref_get_unless_zero(&claim->refcount))
249 * batadv_backbone_hash_find() - looks for a backbone gateway in the hash
250 * @bat_priv: the bat priv with all the soft interface information
251 * @addr: the address of the originator
254 * Return: backbone gateway if found or NULL otherwise
256 static struct batadv_bla_backbone_gw *
257 batadv_backbone_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
260 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
261 struct hlist_head *head;
262 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
263 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
269 ether_addr_copy(search_entry.orig, addr);
270 search_entry.vid = vid;
272 index = batadv_choose_backbone_gw(&search_entry, hash->size);
273 head = &hash->table[index];
276 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
277 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
281 if (!kref_get_unless_zero(&backbone_gw->refcount))
284 backbone_gw_tmp = backbone_gw;
289 return backbone_gw_tmp;
293 * batadv_bla_del_backbone_claims() - delete all claims for a backbone
294 * @backbone_gw: backbone gateway where the claims should be removed
297 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
299 struct batadv_hashtable *hash;
300 struct hlist_node *node_tmp;
301 struct hlist_head *head;
302 struct batadv_bla_claim *claim;
304 spinlock_t *list_lock; /* protects write access to the hash lists */
306 hash = backbone_gw->bat_priv->bla.claim_hash;
310 for (i = 0; i < hash->size; i++) {
311 head = &hash->table[i];
312 list_lock = &hash->list_locks[i];
314 spin_lock_bh(list_lock);
315 hlist_for_each_entry_safe(claim, node_tmp,
317 if (claim->backbone_gw != backbone_gw)
320 batadv_claim_put(claim);
321 hlist_del_rcu(&claim->hash_entry);
323 spin_unlock_bh(list_lock);
326 /* all claims gone, initialize CRC */
327 spin_lock_bh(&backbone_gw->crc_lock);
328 backbone_gw->crc = BATADV_BLA_CRC_INIT;
329 spin_unlock_bh(&backbone_gw->crc_lock);
333 * batadv_bla_send_claim() - sends a claim frame according to the provided info
334 * @bat_priv: the bat priv with all the soft interface information
335 * @mac: the mac address to be announced within the claim
337 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
339 static void batadv_bla_send_claim(struct batadv_priv *bat_priv, const u8 *mac,
340 unsigned short vid, int claimtype)
343 struct ethhdr *ethhdr;
344 struct batadv_hard_iface *primary_if;
345 struct net_device *soft_iface;
347 struct batadv_bla_claim_dst local_claim_dest;
350 primary_if = batadv_primary_if_get_selected(bat_priv);
354 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
355 sizeof(local_claim_dest));
356 local_claim_dest.type = claimtype;
358 soft_iface = primary_if->soft_iface;
360 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
361 /* IP DST: 0.0.0.0 */
363 primary_if->soft_iface,
364 /* IP SRC: 0.0.0.0 */
366 /* Ethernet DST: Broadcast */
368 /* Ethernet SRC/HW SRC: originator mac */
369 primary_if->net_dev->dev_addr,
370 /* HW DST: FF:43:05:XX:YY:YY
371 * with XX = claim type
372 * and YY:YY = group id
374 (u8 *)&local_claim_dest);
379 ethhdr = (struct ethhdr *)skb->data;
380 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
382 /* now we pretend that the client would have sent this ... */
384 case BATADV_CLAIM_TYPE_CLAIM:
385 /* normal claim frame
386 * set Ethernet SRC to the clients mac
388 ether_addr_copy(ethhdr->h_source, mac);
389 batadv_dbg(BATADV_DBG_BLA, bat_priv,
390 "%s(): CLAIM %pM on vid %d\n", __func__, mac,
391 batadv_print_vid(vid));
393 case BATADV_CLAIM_TYPE_UNCLAIM:
395 * set HW SRC to the clients mac
397 ether_addr_copy(hw_src, mac);
398 batadv_dbg(BATADV_DBG_BLA, bat_priv,
399 "%s(): UNCLAIM %pM on vid %d\n", __func__, mac,
400 batadv_print_vid(vid));
402 case BATADV_CLAIM_TYPE_ANNOUNCE:
403 /* announcement frame
404 * set HW SRC to the special mac containing the crc
406 ether_addr_copy(hw_src, mac);
407 batadv_dbg(BATADV_DBG_BLA, bat_priv,
408 "%s(): ANNOUNCE of %pM on vid %d\n", __func__,
409 ethhdr->h_source, batadv_print_vid(vid));
411 case BATADV_CLAIM_TYPE_REQUEST:
413 * set HW SRC and header destination to the receiving backbone
416 ether_addr_copy(hw_src, mac);
417 ether_addr_copy(ethhdr->h_dest, mac);
418 batadv_dbg(BATADV_DBG_BLA, bat_priv,
419 "%s(): REQUEST of %pM to %pM on vid %d\n", __func__,
420 ethhdr->h_source, ethhdr->h_dest,
421 batadv_print_vid(vid));
423 case BATADV_CLAIM_TYPE_LOOPDETECT:
424 ether_addr_copy(ethhdr->h_source, mac);
425 batadv_dbg(BATADV_DBG_BLA, bat_priv,
426 "%s(): LOOPDETECT of %pM to %pM on vid %d\n",
427 __func__, ethhdr->h_source, ethhdr->h_dest,
428 batadv_print_vid(vid));
433 if (vid & BATADV_VLAN_HAS_TAG) {
434 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
435 vid & VLAN_VID_MASK);
440 skb_reset_mac_header(skb);
441 skb->protocol = eth_type_trans(skb, soft_iface);
442 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
443 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
444 skb->len + ETH_HLEN);
446 netif_rx_any_context(skb);
448 batadv_hardif_put(primary_if);
452 * batadv_bla_loopdetect_report() - worker for reporting the loop
453 * @work: work queue item
455 * Throws an uevent, as the loopdetect check function can't do that itself
456 * since the kernel may sleep while throwing uevents.
458 static void batadv_bla_loopdetect_report(struct work_struct *work)
460 struct batadv_bla_backbone_gw *backbone_gw;
461 struct batadv_priv *bat_priv;
462 char vid_str[6] = { '\0' };
464 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
466 bat_priv = backbone_gw->bat_priv;
468 batadv_info(bat_priv->soft_iface,
469 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
470 batadv_print_vid(backbone_gw->vid));
471 snprintf(vid_str, sizeof(vid_str), "%d",
472 batadv_print_vid(backbone_gw->vid));
473 vid_str[sizeof(vid_str) - 1] = 0;
475 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
478 batadv_backbone_gw_put(backbone_gw);
482 * batadv_bla_get_backbone_gw() - finds or creates a backbone gateway
483 * @bat_priv: the bat priv with all the soft interface information
484 * @orig: the mac address of the originator
486 * @own_backbone: set if the requested backbone is local
488 * Return: the (possibly created) backbone gateway or NULL on error
490 static struct batadv_bla_backbone_gw *
491 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, const u8 *orig,
492 unsigned short vid, bool own_backbone)
494 struct batadv_bla_backbone_gw *entry;
495 struct batadv_orig_node *orig_node;
498 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
503 batadv_dbg(BATADV_DBG_BLA, bat_priv,
504 "%s(): not found (%pM, %d), creating new entry\n", __func__,
505 orig, batadv_print_vid(vid));
507 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
512 entry->lasttime = jiffies;
513 entry->crc = BATADV_BLA_CRC_INIT;
514 entry->bat_priv = bat_priv;
515 spin_lock_init(&entry->crc_lock);
516 atomic_set(&entry->request_sent, 0);
517 atomic_set(&entry->wait_periods, 0);
518 ether_addr_copy(entry->orig, orig);
519 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
520 kref_init(&entry->refcount);
522 kref_get(&entry->refcount);
523 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
524 batadv_compare_backbone_gw,
525 batadv_choose_backbone_gw, entry,
528 if (unlikely(hash_added != 0)) {
529 /* hash failed, free the structure */
534 /* this is a gateway now, remove any TT entry on this VLAN */
535 orig_node = batadv_orig_hash_find(bat_priv, orig);
537 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
538 "became a backbone gateway");
539 batadv_orig_node_put(orig_node);
543 batadv_bla_send_announce(bat_priv, entry);
545 /* this will be decreased in the worker thread */
546 atomic_inc(&entry->request_sent);
547 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
548 atomic_inc(&bat_priv->bla.num_requests);
555 * batadv_bla_update_own_backbone_gw() - updates the own backbone gw for a VLAN
556 * @bat_priv: the bat priv with all the soft interface information
557 * @primary_if: the selected primary interface
558 * @vid: VLAN identifier
560 * update or add the own backbone gw to make sure we announce
561 * where we receive other backbone gws
564 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
565 struct batadv_hard_iface *primary_if,
568 struct batadv_bla_backbone_gw *backbone_gw;
570 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
571 primary_if->net_dev->dev_addr,
573 if (unlikely(!backbone_gw))
576 backbone_gw->lasttime = jiffies;
577 batadv_backbone_gw_put(backbone_gw);
581 * batadv_bla_answer_request() - answer a bla request by sending own claims
582 * @bat_priv: the bat priv with all the soft interface information
583 * @primary_if: interface where the request came on
584 * @vid: the vid where the request came on
586 * Repeat all of our own claims, and finally send an ANNOUNCE frame
587 * to allow the requester another check if the CRC is correct now.
589 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
590 struct batadv_hard_iface *primary_if,
593 struct hlist_head *head;
594 struct batadv_hashtable *hash;
595 struct batadv_bla_claim *claim;
596 struct batadv_bla_backbone_gw *backbone_gw;
599 batadv_dbg(BATADV_DBG_BLA, bat_priv,
600 "%s(): received a claim request, send all of our own claims again\n",
603 backbone_gw = batadv_backbone_hash_find(bat_priv,
604 primary_if->net_dev->dev_addr,
609 hash = bat_priv->bla.claim_hash;
610 for (i = 0; i < hash->size; i++) {
611 head = &hash->table[i];
614 hlist_for_each_entry_rcu(claim, head, hash_entry) {
615 /* only own claims are interesting */
616 if (claim->backbone_gw != backbone_gw)
619 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
620 BATADV_CLAIM_TYPE_CLAIM);
625 /* finally, send an announcement frame */
626 batadv_bla_send_announce(bat_priv, backbone_gw);
627 batadv_backbone_gw_put(backbone_gw);
631 * batadv_bla_send_request() - send a request to repeat claims
632 * @backbone_gw: the backbone gateway from whom we are out of sync
634 * When the crc is wrong, ask the backbone gateway for a full table update.
635 * After the request, it will repeat all of his own claims and finally
636 * send an announcement claim with which we can check again.
638 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
640 /* first, remove all old entries */
641 batadv_bla_del_backbone_claims(backbone_gw);
643 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
644 "Sending REQUEST to %pM\n", backbone_gw->orig);
647 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
648 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
650 /* no local broadcasts should be sent or received, for now. */
651 if (!atomic_read(&backbone_gw->request_sent)) {
652 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
653 atomic_set(&backbone_gw->request_sent, 1);
658 * batadv_bla_send_announce() - Send an announcement frame
659 * @bat_priv: the bat priv with all the soft interface information
660 * @backbone_gw: our backbone gateway which should be announced
662 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
663 struct batadv_bla_backbone_gw *backbone_gw)
668 memcpy(mac, batadv_announce_mac, 4);
669 spin_lock_bh(&backbone_gw->crc_lock);
670 crc = htons(backbone_gw->crc);
671 spin_unlock_bh(&backbone_gw->crc_lock);
672 memcpy(&mac[4], &crc, 2);
674 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
675 BATADV_CLAIM_TYPE_ANNOUNCE);
679 * batadv_bla_add_claim() - Adds a claim in the claim hash
680 * @bat_priv: the bat priv with all the soft interface information
681 * @mac: the mac address of the claim
682 * @vid: the VLAN ID of the frame
683 * @backbone_gw: the backbone gateway which claims it
685 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
686 const u8 *mac, const unsigned short vid,
687 struct batadv_bla_backbone_gw *backbone_gw)
689 struct batadv_bla_backbone_gw *old_backbone_gw;
690 struct batadv_bla_claim *claim;
691 struct batadv_bla_claim search_claim;
692 bool remove_crc = false;
695 ether_addr_copy(search_claim.addr, mac);
696 search_claim.vid = vid;
697 claim = batadv_claim_hash_find(bat_priv, &search_claim);
699 /* create a new claim entry if it does not exist yet. */
701 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
705 ether_addr_copy(claim->addr, mac);
706 spin_lock_init(&claim->backbone_lock);
708 claim->lasttime = jiffies;
709 kref_get(&backbone_gw->refcount);
710 claim->backbone_gw = backbone_gw;
711 kref_init(&claim->refcount);
713 batadv_dbg(BATADV_DBG_BLA, bat_priv,
714 "%s(): adding new entry %pM, vid %d to hash ...\n",
715 __func__, mac, batadv_print_vid(vid));
717 kref_get(&claim->refcount);
718 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
719 batadv_compare_claim,
720 batadv_choose_claim, claim,
723 if (unlikely(hash_added != 0)) {
724 /* only local changes happened. */
729 claim->lasttime = jiffies;
730 if (claim->backbone_gw == backbone_gw)
731 /* no need to register a new backbone */
734 batadv_dbg(BATADV_DBG_BLA, bat_priv,
735 "%s(): changing ownership for %pM, vid %d to gw %pM\n",
736 __func__, mac, batadv_print_vid(vid),
742 /* replace backbone_gw atomically and adjust reference counters */
743 spin_lock_bh(&claim->backbone_lock);
744 old_backbone_gw = claim->backbone_gw;
745 kref_get(&backbone_gw->refcount);
746 claim->backbone_gw = backbone_gw;
747 spin_unlock_bh(&claim->backbone_lock);
750 /* remove claim address from old backbone_gw */
751 spin_lock_bh(&old_backbone_gw->crc_lock);
752 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
753 spin_unlock_bh(&old_backbone_gw->crc_lock);
756 batadv_backbone_gw_put(old_backbone_gw);
758 /* add claim address to new backbone_gw */
759 spin_lock_bh(&backbone_gw->crc_lock);
760 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
761 spin_unlock_bh(&backbone_gw->crc_lock);
762 backbone_gw->lasttime = jiffies;
765 batadv_claim_put(claim);
769 * batadv_bla_claim_get_backbone_gw() - Get valid reference for backbone_gw of
771 * @claim: claim whose backbone_gw should be returned
773 * Return: valid reference to claim::backbone_gw
775 static struct batadv_bla_backbone_gw *
776 batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
778 struct batadv_bla_backbone_gw *backbone_gw;
780 spin_lock_bh(&claim->backbone_lock);
781 backbone_gw = claim->backbone_gw;
782 kref_get(&backbone_gw->refcount);
783 spin_unlock_bh(&claim->backbone_lock);
789 * batadv_bla_del_claim() - delete a claim from the claim hash
790 * @bat_priv: the bat priv with all the soft interface information
791 * @mac: mac address of the claim to be removed
792 * @vid: VLAN id for the claim to be removed
794 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
795 const u8 *mac, const unsigned short vid)
797 struct batadv_bla_claim search_claim, *claim;
798 struct batadv_bla_claim *claim_removed_entry;
799 struct hlist_node *claim_removed_node;
801 ether_addr_copy(search_claim.addr, mac);
802 search_claim.vid = vid;
803 claim = batadv_claim_hash_find(bat_priv, &search_claim);
807 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): %pM, vid %d\n", __func__,
808 mac, batadv_print_vid(vid));
810 claim_removed_node = batadv_hash_remove(bat_priv->bla.claim_hash,
811 batadv_compare_claim,
812 batadv_choose_claim, claim);
813 if (!claim_removed_node)
816 /* reference from the hash is gone */
817 claim_removed_entry = hlist_entry(claim_removed_node,
818 struct batadv_bla_claim, hash_entry);
819 batadv_claim_put(claim_removed_entry);
822 /* don't need the reference from hash_find() anymore */
823 batadv_claim_put(claim);
827 * batadv_handle_announce() - check for ANNOUNCE frame
828 * @bat_priv: the bat priv with all the soft interface information
829 * @an_addr: announcement mac address (ARP Sender HW address)
830 * @backbone_addr: originator address of the sender (Ethernet source MAC)
831 * @vid: the VLAN ID of the frame
833 * Return: true if handled
835 static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
836 u8 *backbone_addr, unsigned short vid)
838 struct batadv_bla_backbone_gw *backbone_gw;
839 u16 backbone_crc, crc;
841 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
844 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
847 if (unlikely(!backbone_gw))
850 /* handle as ANNOUNCE frame */
851 backbone_gw->lasttime = jiffies;
852 crc = ntohs(*((__force __be16 *)(&an_addr[4])));
854 batadv_dbg(BATADV_DBG_BLA, bat_priv,
855 "%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
856 __func__, batadv_print_vid(vid), backbone_gw->orig, crc);
858 spin_lock_bh(&backbone_gw->crc_lock);
859 backbone_crc = backbone_gw->crc;
860 spin_unlock_bh(&backbone_gw->crc_lock);
862 if (backbone_crc != crc) {
863 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
864 "%s(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
865 __func__, backbone_gw->orig,
866 batadv_print_vid(backbone_gw->vid),
869 batadv_bla_send_request(backbone_gw);
871 /* if we have sent a request and the crc was OK,
872 * we can allow traffic again.
874 if (atomic_read(&backbone_gw->request_sent)) {
875 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
876 atomic_set(&backbone_gw->request_sent, 0);
880 batadv_backbone_gw_put(backbone_gw);
885 * batadv_handle_request() - check for REQUEST frame
886 * @bat_priv: the bat priv with all the soft interface information
887 * @primary_if: the primary hard interface of this batman soft interface
888 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
889 * @ethhdr: ethernet header of a packet
890 * @vid: the VLAN ID of the frame
892 * Return: true if handled
894 static bool batadv_handle_request(struct batadv_priv *bat_priv,
895 struct batadv_hard_iface *primary_if,
896 u8 *backbone_addr, struct ethhdr *ethhdr,
899 /* check for REQUEST frame */
900 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
903 /* sanity check, this should not happen on a normal switch,
904 * we ignore it in this case.
906 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
909 batadv_dbg(BATADV_DBG_BLA, bat_priv,
910 "%s(): REQUEST vid %d (sent by %pM)...\n",
911 __func__, batadv_print_vid(vid), ethhdr->h_source);
913 batadv_bla_answer_request(bat_priv, primary_if, vid);
918 * batadv_handle_unclaim() - check for UNCLAIM frame
919 * @bat_priv: the bat priv with all the soft interface information
920 * @primary_if: the primary hard interface of this batman soft interface
921 * @backbone_addr: originator address of the backbone (Ethernet source)
922 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
923 * @vid: the VLAN ID of the frame
925 * Return: true if handled
927 static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
928 struct batadv_hard_iface *primary_if,
929 const u8 *backbone_addr, const u8 *claim_addr,
932 struct batadv_bla_backbone_gw *backbone_gw;
934 /* unclaim in any case if it is our own */
935 if (primary_if && batadv_compare_eth(backbone_addr,
936 primary_if->net_dev->dev_addr))
937 batadv_bla_send_claim(bat_priv, claim_addr, vid,
938 BATADV_CLAIM_TYPE_UNCLAIM);
940 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
945 /* this must be an UNCLAIM frame */
946 batadv_dbg(BATADV_DBG_BLA, bat_priv,
947 "%s(): UNCLAIM %pM on vid %d (sent by %pM)...\n", __func__,
948 claim_addr, batadv_print_vid(vid), backbone_gw->orig);
950 batadv_bla_del_claim(bat_priv, claim_addr, vid);
951 batadv_backbone_gw_put(backbone_gw);
956 * batadv_handle_claim() - check for CLAIM frame
957 * @bat_priv: the bat priv with all the soft interface information
958 * @primary_if: the primary hard interface of this batman soft interface
959 * @backbone_addr: originator address of the backbone (Ethernet Source)
960 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
961 * @vid: the VLAN ID of the frame
963 * Return: true if handled
965 static bool batadv_handle_claim(struct batadv_priv *bat_priv,
966 struct batadv_hard_iface *primary_if,
967 const u8 *backbone_addr, const u8 *claim_addr,
970 struct batadv_bla_backbone_gw *backbone_gw;
972 /* register the gateway if not yet available, and add the claim. */
974 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
977 if (unlikely(!backbone_gw))
980 /* this must be a CLAIM frame */
981 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
982 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
983 batadv_bla_send_claim(bat_priv, claim_addr, vid,
984 BATADV_CLAIM_TYPE_CLAIM);
986 /* TODO: we could call something like tt_local_del() here. */
988 batadv_backbone_gw_put(backbone_gw);
993 * batadv_check_claim_group() - check for claim group membership
994 * @bat_priv: the bat priv with all the soft interface information
995 * @primary_if: the primary interface of this batman interface
996 * @hw_src: the Hardware source in the ARP Header
997 * @hw_dst: the Hardware destination in the ARP Header
998 * @ethhdr: pointer to the Ethernet header of the claim frame
1000 * checks if it is a claim packet and if it's on the same group.
1001 * This function also applies the group ID of the sender
1002 * if it is in the same mesh.
1005 * 2 - if it is a claim packet and on the same group
1006 * 1 - if is a claim packet from another group
1007 * 0 - if it is not a claim packet
1009 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
1010 struct batadv_hard_iface *primary_if,
1011 u8 *hw_src, u8 *hw_dst,
1012 struct ethhdr *ethhdr)
1015 struct batadv_orig_node *orig_node;
1016 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1018 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1019 bla_dst_own = &bat_priv->bla.claim_dest;
1021 /* if announcement packet, use the source,
1022 * otherwise assume it is in the hw_src
1024 switch (bla_dst->type) {
1025 case BATADV_CLAIM_TYPE_CLAIM:
1026 backbone_addr = hw_src;
1028 case BATADV_CLAIM_TYPE_REQUEST:
1029 case BATADV_CLAIM_TYPE_ANNOUNCE:
1030 case BATADV_CLAIM_TYPE_UNCLAIM:
1031 backbone_addr = ethhdr->h_source;
1037 /* don't accept claim frames from ourselves */
1038 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
1041 /* if its already the same group, it is fine. */
1042 if (bla_dst->group == bla_dst_own->group)
1045 /* lets see if this originator is in our mesh */
1046 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
1048 /* don't accept claims from gateways which are not in
1049 * the same mesh or group.
1054 /* if our mesh friends mac is bigger, use it for ourselves. */
1055 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
1056 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1057 "taking other backbones claim group: %#.4x\n",
1058 ntohs(bla_dst->group));
1059 bla_dst_own->group = bla_dst->group;
1062 batadv_orig_node_put(orig_node);
1068 * batadv_bla_process_claim() - Check if this is a claim frame, and process it
1069 * @bat_priv: the bat priv with all the soft interface information
1070 * @primary_if: the primary hard interface of this batman soft interface
1071 * @skb: the frame to be checked
1073 * Return: true if it was a claim frame, otherwise return false to
1074 * tell the callee that it can use the frame on its own.
1076 static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1077 struct batadv_hard_iface *primary_if,
1078 struct sk_buff *skb)
1080 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1081 u8 *hw_src, *hw_dst;
1082 struct vlan_hdr *vhdr, vhdr_buf;
1083 struct ethhdr *ethhdr;
1084 struct arphdr *arphdr;
1091 vid = batadv_get_vid(skb, 0);
1092 ethhdr = eth_hdr(skb);
1094 proto = ethhdr->h_proto;
1096 if (vid & BATADV_VLAN_HAS_TAG) {
1097 /* Traverse the VLAN/Ethertypes.
1099 * At this point it is known that the first protocol is a VLAN
1100 * header, so start checking at the encapsulated protocol.
1102 * The depth of the VLAN headers is recorded to drop BLA claim
1103 * frames encapsulated into multiple VLAN headers (QinQ).
1106 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1111 proto = vhdr->h_vlan_encapsulated_proto;
1112 headlen += VLAN_HLEN;
1114 } while (proto == htons(ETH_P_8021Q));
1117 if (proto != htons(ETH_P_ARP))
1118 return false; /* not a claim frame */
1120 /* this must be a ARP frame. check if it is a claim. */
1122 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1125 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
1126 ethhdr = eth_hdr(skb);
1127 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
1129 /* Check whether the ARP frame carries a valid
1132 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1134 if (arphdr->ar_pro != htons(ETH_P_IP))
1136 if (arphdr->ar_hln != ETH_ALEN)
1138 if (arphdr->ar_pln != 4)
1141 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
1142 hw_dst = hw_src + ETH_ALEN + 4;
1143 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1144 bla_dst_own = &bat_priv->bla.claim_dest;
1146 /* check if it is a claim frame in general */
1147 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1148 sizeof(bla_dst->magic)) != 0)
1151 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1152 * drop that, as this is not supported by BLA but should also not be
1153 * sent via the mesh.
1158 /* Let the loopdetect frames on the mesh in any case. */
1159 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
1162 /* check if it is a claim frame. */
1163 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1166 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1167 "%s(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1168 __func__, ethhdr->h_source, batadv_print_vid(vid),
1174 /* become a backbone gw ourselves on this vlan if not happened yet */
1175 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1177 /* check for the different types of claim frames ... */
1178 switch (bla_dst->type) {
1179 case BATADV_CLAIM_TYPE_CLAIM:
1180 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1181 ethhdr->h_source, vid))
1184 case BATADV_CLAIM_TYPE_UNCLAIM:
1185 if (batadv_handle_unclaim(bat_priv, primary_if,
1186 ethhdr->h_source, hw_src, vid))
1190 case BATADV_CLAIM_TYPE_ANNOUNCE:
1191 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1195 case BATADV_CLAIM_TYPE_REQUEST:
1196 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1202 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1203 "%s(): ERROR - this looks like a claim frame, but is useless. eth src %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1204 __func__, ethhdr->h_source, batadv_print_vid(vid), hw_src,
1210 * batadv_bla_purge_backbone_gw() - Remove backbone gateways after a timeout or
1212 * @bat_priv: the bat priv with all the soft interface information
1213 * @now: whether the whole hash shall be wiped now
1215 * Check when we last heard from other nodes, and remove them in case of
1216 * a time out, or clean all backbone gws if now is set.
1218 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1220 struct batadv_bla_backbone_gw *backbone_gw;
1221 struct hlist_node *node_tmp;
1222 struct hlist_head *head;
1223 struct batadv_hashtable *hash;
1224 spinlock_t *list_lock; /* protects write access to the hash lists */
1227 hash = bat_priv->bla.backbone_hash;
1231 for (i = 0; i < hash->size; i++) {
1232 head = &hash->table[i];
1233 list_lock = &hash->list_locks[i];
1235 spin_lock_bh(list_lock);
1236 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1240 if (!batadv_has_timed_out(backbone_gw->lasttime,
1241 BATADV_BLA_BACKBONE_TIMEOUT))
1244 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1245 "%s(): backbone gw %pM timed out\n",
1246 __func__, backbone_gw->orig);
1249 /* don't wait for the pending request anymore */
1250 if (atomic_read(&backbone_gw->request_sent))
1251 atomic_dec(&bat_priv->bla.num_requests);
1253 batadv_bla_del_backbone_claims(backbone_gw);
1255 hlist_del_rcu(&backbone_gw->hash_entry);
1256 batadv_backbone_gw_put(backbone_gw);
1258 spin_unlock_bh(list_lock);
1263 * batadv_bla_purge_claims() - Remove claims after a timeout or immediately
1264 * @bat_priv: the bat priv with all the soft interface information
1265 * @primary_if: the selected primary interface, may be NULL if now is set
1266 * @now: whether the whole hash shall be wiped now
1268 * Check when we heard last time from our own claims, and remove them in case of
1269 * a time out, or clean all claims if now is set
1271 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1272 struct batadv_hard_iface *primary_if,
1275 struct batadv_bla_backbone_gw *backbone_gw;
1276 struct batadv_bla_claim *claim;
1277 struct hlist_head *head;
1278 struct batadv_hashtable *hash;
1281 hash = bat_priv->bla.claim_hash;
1285 for (i = 0; i < hash->size; i++) {
1286 head = &hash->table[i];
1289 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1290 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1294 if (!batadv_compare_eth(backbone_gw->orig,
1295 primary_if->net_dev->dev_addr))
1298 if (!batadv_has_timed_out(claim->lasttime,
1299 BATADV_BLA_CLAIM_TIMEOUT))
1302 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1303 "%s(): timed out.\n", __func__);
1306 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1307 "%s(): %pM, vid %d\n", __func__,
1308 claim->addr, claim->vid);
1310 batadv_handle_unclaim(bat_priv, primary_if,
1312 claim->addr, claim->vid);
1314 batadv_backbone_gw_put(backbone_gw);
1321 * batadv_bla_update_orig_address() - Update the backbone gateways when the own
1322 * originator address changes
1323 * @bat_priv: the bat priv with all the soft interface information
1324 * @primary_if: the new selected primary_if
1325 * @oldif: the old primary interface, may be NULL
1327 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1328 struct batadv_hard_iface *primary_if,
1329 struct batadv_hard_iface *oldif)
1331 struct batadv_bla_backbone_gw *backbone_gw;
1332 struct hlist_head *head;
1333 struct batadv_hashtable *hash;
1337 /* reset bridge loop avoidance group id */
1338 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1339 bat_priv->bla.claim_dest.group = group;
1341 /* purge everything when bridge loop avoidance is turned off */
1342 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1346 batadv_bla_purge_claims(bat_priv, NULL, 1);
1347 batadv_bla_purge_backbone_gw(bat_priv, 1);
1351 hash = bat_priv->bla.backbone_hash;
1355 for (i = 0; i < hash->size; i++) {
1356 head = &hash->table[i];
1359 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1360 /* own orig still holds the old value. */
1361 if (!batadv_compare_eth(backbone_gw->orig,
1362 oldif->net_dev->dev_addr))
1365 ether_addr_copy(backbone_gw->orig,
1366 primary_if->net_dev->dev_addr);
1367 /* send an announce frame so others will ask for our
1368 * claims and update their tables.
1370 batadv_bla_send_announce(bat_priv, backbone_gw);
1377 * batadv_bla_send_loopdetect() - send a loopdetect frame
1378 * @bat_priv: the bat priv with all the soft interface information
1379 * @backbone_gw: the backbone gateway for which a loop should be detected
1381 * To detect loops that the bridge loop avoidance can't handle, send a loop
1382 * detection packet on the backbone. Unlike other BLA frames, this frame will
1383 * be allowed on the mesh by other nodes. If it is received on the mesh, this
1384 * indicates that there is a loop.
1387 batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1388 struct batadv_bla_backbone_gw *backbone_gw)
1390 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1392 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1393 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1397 * batadv_bla_status_update() - purge bla interfaces if necessary
1398 * @net_dev: the soft interface net device
1400 void batadv_bla_status_update(struct net_device *net_dev)
1402 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1403 struct batadv_hard_iface *primary_if;
1405 primary_if = batadv_primary_if_get_selected(bat_priv);
1409 /* this function already purges everything when bla is disabled,
1410 * so just call that one.
1412 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1413 batadv_hardif_put(primary_if);
1417 * batadv_bla_periodic_work() - performs periodic bla work
1418 * @work: kernel work struct
1420 * periodic work to do:
1421 * * purge structures when they are too old
1422 * * send announcements
1424 static void batadv_bla_periodic_work(struct work_struct *work)
1426 struct delayed_work *delayed_work;
1427 struct batadv_priv *bat_priv;
1428 struct batadv_priv_bla *priv_bla;
1429 struct hlist_head *head;
1430 struct batadv_bla_backbone_gw *backbone_gw;
1431 struct batadv_hashtable *hash;
1432 struct batadv_hard_iface *primary_if;
1433 bool send_loopdetect = false;
1436 delayed_work = to_delayed_work(work);
1437 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1438 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1439 primary_if = batadv_primary_if_get_selected(bat_priv);
1443 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1444 batadv_bla_purge_backbone_gw(bat_priv, 0);
1446 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1449 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1450 /* set a new random mac address for the next bridge loop
1451 * detection frames. Set the locally administered bit to avoid
1452 * collisions with users mac addresses.
1454 eth_random_addr(bat_priv->bla.loopdetect_addr);
1455 bat_priv->bla.loopdetect_addr[0] = 0xba;
1456 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1457 bat_priv->bla.loopdetect_lasttime = jiffies;
1458 atomic_set(&bat_priv->bla.loopdetect_next,
1459 BATADV_BLA_LOOPDETECT_PERIODS);
1461 /* mark for sending loop detect on all VLANs */
1462 send_loopdetect = true;
1465 hash = bat_priv->bla.backbone_hash;
1469 for (i = 0; i < hash->size; i++) {
1470 head = &hash->table[i];
1473 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1474 if (!batadv_compare_eth(backbone_gw->orig,
1475 primary_if->net_dev->dev_addr))
1478 backbone_gw->lasttime = jiffies;
1480 batadv_bla_send_announce(bat_priv, backbone_gw);
1481 if (send_loopdetect)
1482 batadv_bla_send_loopdetect(bat_priv,
1485 /* request_sent is only set after creation to avoid
1486 * problems when we are not yet known as backbone gw
1489 * We can reset this now after we waited some periods
1490 * to give bridge forward delays and bla group forming
1494 if (atomic_read(&backbone_gw->request_sent) == 0)
1497 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1500 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1501 atomic_set(&backbone_gw->request_sent, 0);
1506 batadv_hardif_put(primary_if);
1508 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1509 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1512 /* The hash for claim and backbone hash receive the same key because they
1513 * are getting initialized by hash_new with the same key. Reinitializing
1514 * them with to different keys to allow nested locking without generating
1517 static struct lock_class_key batadv_claim_hash_lock_class_key;
1518 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1521 * batadv_bla_init() - initialize all bla structures
1522 * @bat_priv: the bat priv with all the soft interface information
1524 * Return: 0 on success, < 0 on error.
1526 int batadv_bla_init(struct batadv_priv *bat_priv)
1529 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1530 struct batadv_hard_iface *primary_if;
1532 unsigned long entrytime;
1534 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1536 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1538 /* setting claim destination address */
1539 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1540 bat_priv->bla.claim_dest.type = 0;
1541 primary_if = batadv_primary_if_get_selected(bat_priv);
1543 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1544 bat_priv->bla.claim_dest.group = htons(crc);
1545 batadv_hardif_put(primary_if);
1547 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1550 /* initialize the duplicate list */
1551 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1552 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1553 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1554 bat_priv->bla.bcast_duplist_curr = 0;
1556 atomic_set(&bat_priv->bla.loopdetect_next,
1557 BATADV_BLA_LOOPDETECT_PERIODS);
1559 if (bat_priv->bla.claim_hash)
1562 bat_priv->bla.claim_hash = batadv_hash_new(128);
1563 if (!bat_priv->bla.claim_hash)
1566 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1567 if (!bat_priv->bla.backbone_hash) {
1568 batadv_hash_destroy(bat_priv->bla.claim_hash);
1572 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1573 &batadv_claim_hash_lock_class_key);
1574 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1575 &batadv_backbone_hash_lock_class_key);
1577 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1579 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1581 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1582 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1587 * batadv_bla_check_duplist() - Check if a frame is in the broadcast dup.
1588 * @bat_priv: the bat priv with all the soft interface information
1589 * @skb: contains the multicast packet to be checked
1590 * @payload_ptr: pointer to position inside the head buffer of the skb
1591 * marking the start of the data to be CRC'ed
1592 * @orig: originator mac address, NULL if unknown
1594 * Check if it is on our broadcast list. Another gateway might have sent the
1595 * same packet because it is connected to the same backbone, so we have to
1596 * remove this duplicate.
1598 * This is performed by checking the CRC, which will tell us
1599 * with a good chance that it is the same packet. If it is furthermore
1600 * sent by another host, drop it. We allow equal packets from
1601 * the same host however as this might be intended.
1603 * Return: true if a packet is in the duplicate list, false otherwise.
1605 static bool batadv_bla_check_duplist(struct batadv_priv *bat_priv,
1606 struct sk_buff *skb, u8 *payload_ptr,
1609 struct batadv_bcast_duplist_entry *entry;
1614 /* calculate the crc ... */
1615 crc = batadv_skb_crc32(skb, payload_ptr);
1617 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1619 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1620 curr = (bat_priv->bla.bcast_duplist_curr + i);
1621 curr %= BATADV_DUPLIST_SIZE;
1622 entry = &bat_priv->bla.bcast_duplist[curr];
1624 /* we can stop searching if the entry is too old ;
1625 * later entries will be even older
1627 if (batadv_has_timed_out(entry->entrytime,
1628 BATADV_DUPLIST_TIMEOUT))
1631 if (entry->crc != crc)
1634 /* are the originators both known and not anonymous? */
1635 if (orig && !is_zero_ether_addr(orig) &&
1636 !is_zero_ether_addr(entry->orig)) {
1637 /* If known, check if the new frame came from
1638 * the same originator:
1639 * We are safe to take identical frames from the
1640 * same orig, if known, as multiplications in
1641 * the mesh are detected via the (orig, seqno) pair.
1642 * So we can be a bit more liberal here and allow
1643 * identical frames from the same orig which the source
1644 * host might have sent multiple times on purpose.
1646 if (batadv_compare_eth(entry->orig, orig))
1650 /* this entry seems to match: same crc, not too old,
1651 * and from another gw. therefore return true to forbid it.
1656 /* not found, add a new entry (overwrite the oldest entry)
1657 * and allow it, its the first occurrence.
1659 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1660 curr %= BATADV_DUPLIST_SIZE;
1661 entry = &bat_priv->bla.bcast_duplist[curr];
1663 entry->entrytime = jiffies;
1665 /* known originator */
1667 ether_addr_copy(entry->orig, orig);
1668 /* anonymous originator */
1670 eth_zero_addr(entry->orig);
1672 bat_priv->bla.bcast_duplist_curr = curr;
1675 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1681 * batadv_bla_check_ucast_duplist() - Check if a frame is in the broadcast dup.
1682 * @bat_priv: the bat priv with all the soft interface information
1683 * @skb: contains the multicast packet to be checked, decapsulated from a
1686 * Check if it is on our broadcast list. Another gateway might have sent the
1687 * same packet because it is connected to the same backbone, so we have to
1688 * remove this duplicate.
1690 * Return: true if a packet is in the duplicate list, false otherwise.
1692 static bool batadv_bla_check_ucast_duplist(struct batadv_priv *bat_priv,
1693 struct sk_buff *skb)
1695 return batadv_bla_check_duplist(bat_priv, skb, (u8 *)skb->data, NULL);
1699 * batadv_bla_check_bcast_duplist() - Check if a frame is in the broadcast dup.
1700 * @bat_priv: the bat priv with all the soft interface information
1701 * @skb: contains the bcast_packet to be checked
1703 * Check if it is on our broadcast list. Another gateway might have sent the
1704 * same packet because it is connected to the same backbone, so we have to
1705 * remove this duplicate.
1707 * Return: true if a packet is in the duplicate list, false otherwise.
1709 bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1710 struct sk_buff *skb)
1712 struct batadv_bcast_packet *bcast_packet;
1715 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1716 payload_ptr = (u8 *)(bcast_packet + 1);
1718 return batadv_bla_check_duplist(bat_priv, skb, payload_ptr,
1719 bcast_packet->orig);
1723 * batadv_bla_is_backbone_gw_orig() - Check if the originator is a gateway for
1724 * the VLAN identified by vid.
1725 * @bat_priv: the bat priv with all the soft interface information
1726 * @orig: originator mac address
1727 * @vid: VLAN identifier
1729 * Return: true if orig is a backbone for this vid, false otherwise.
1731 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1734 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1735 struct hlist_head *head;
1736 struct batadv_bla_backbone_gw *backbone_gw;
1739 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1745 for (i = 0; i < hash->size; i++) {
1746 head = &hash->table[i];
1749 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1750 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1751 backbone_gw->vid == vid) {
1763 * batadv_bla_is_backbone_gw() - check if originator is a backbone gw for a VLAN
1764 * @skb: the frame to be checked
1765 * @orig_node: the orig_node of the frame
1766 * @hdr_size: maximum length of the frame
1768 * Return: true if the orig_node is also a gateway on the soft interface,
1769 * otherwise it returns false.
1771 bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1772 struct batadv_orig_node *orig_node, int hdr_size)
1774 struct batadv_bla_backbone_gw *backbone_gw;
1777 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1780 /* first, find out the vid. */
1781 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1784 vid = batadv_get_vid(skb, hdr_size);
1786 /* see if this originator is a backbone gw for this VLAN */
1787 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1788 orig_node->orig, vid);
1792 batadv_backbone_gw_put(backbone_gw);
1797 * batadv_bla_free() - free all bla structures
1798 * @bat_priv: the bat priv with all the soft interface information
1800 * for softinterface free or module unload
1802 void batadv_bla_free(struct batadv_priv *bat_priv)
1804 struct batadv_hard_iface *primary_if;
1806 cancel_delayed_work_sync(&bat_priv->bla.work);
1807 primary_if = batadv_primary_if_get_selected(bat_priv);
1809 if (bat_priv->bla.claim_hash) {
1810 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1811 batadv_hash_destroy(bat_priv->bla.claim_hash);
1812 bat_priv->bla.claim_hash = NULL;
1814 if (bat_priv->bla.backbone_hash) {
1815 batadv_bla_purge_backbone_gw(bat_priv, 1);
1816 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1817 bat_priv->bla.backbone_hash = NULL;
1819 batadv_hardif_put(primary_if);
1823 * batadv_bla_loopdetect_check() - check and handle a detected loop
1824 * @bat_priv: the bat priv with all the soft interface information
1825 * @skb: the packet to check
1826 * @primary_if: interface where the request came on
1827 * @vid: the VLAN ID of the frame
1829 * Checks if this packet is a loop detect frame which has been sent by us,
1830 * throws an uevent and logs the event if that is the case.
1832 * Return: true if it is a loop detect frame which is to be dropped, false
1836 batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1837 struct batadv_hard_iface *primary_if,
1840 struct batadv_bla_backbone_gw *backbone_gw;
1841 struct ethhdr *ethhdr;
1844 ethhdr = eth_hdr(skb);
1846 /* Only check for the MAC address and skip more checks here for
1847 * performance reasons - this function is on the hotpath, after all.
1849 if (!batadv_compare_eth(ethhdr->h_source,
1850 bat_priv->bla.loopdetect_addr))
1853 /* If the packet came too late, don't forward it on the mesh
1854 * but don't consider that as loop. It might be a coincidence.
1856 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1857 BATADV_BLA_LOOPDETECT_TIMEOUT))
1860 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1861 primary_if->net_dev->dev_addr,
1863 if (unlikely(!backbone_gw))
1866 ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1868 /* backbone_gw is unreferenced in the report work function
1869 * if queue_work() call was successful
1872 batadv_backbone_gw_put(backbone_gw);
1878 * batadv_bla_rx() - check packets coming from the mesh.
1879 * @bat_priv: the bat priv with all the soft interface information
1880 * @skb: the frame to be checked
1881 * @vid: the VLAN ID of the frame
1882 * @packet_type: the batman packet type this frame came in
1884 * batadv_bla_rx avoidance checks if:
1885 * * we have to race for a claim
1886 * * if the frame is allowed on the LAN
1888 * In these cases, the skb is further handled by this function
1890 * Return: true if handled, otherwise it returns false and the caller shall
1891 * further process the skb.
1893 bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1894 unsigned short vid, int packet_type)
1896 struct batadv_bla_backbone_gw *backbone_gw;
1897 struct ethhdr *ethhdr;
1898 struct batadv_bla_claim search_claim, *claim = NULL;
1899 struct batadv_hard_iface *primary_if;
1903 ethhdr = eth_hdr(skb);
1905 primary_if = batadv_primary_if_get_selected(bat_priv);
1909 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1912 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1915 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1916 /* don't allow multicast packets while requests are in flight */
1917 if (is_multicast_ether_addr(ethhdr->h_dest))
1918 /* Both broadcast flooding or multicast-via-unicasts
1919 * delivery might send to multiple backbone gateways
1920 * sharing the same LAN and therefore need to coordinate
1921 * which backbone gateway forwards into the LAN,
1922 * by claiming the payload source address.
1924 * Broadcast flooding and multicast-via-unicasts
1925 * delivery use the following two batman packet types.
1926 * Note: explicitly exclude BATADV_UNICAST_4ADDR,
1927 * as the DHCP gateway feature will send explicitly
1928 * to only one BLA gateway, so the claiming process
1929 * should be avoided there.
1931 if (packet_type == BATADV_BCAST ||
1932 packet_type == BATADV_UNICAST)
1935 /* potential duplicates from foreign BLA backbone gateways via
1936 * multicast-in-unicast packets
1938 if (is_multicast_ether_addr(ethhdr->h_dest) &&
1939 packet_type == BATADV_UNICAST &&
1940 batadv_bla_check_ucast_duplist(bat_priv, skb))
1943 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1944 search_claim.vid = vid;
1945 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1948 /* possible optimization: race for a claim */
1949 /* No claim exists yet, claim it for us!
1952 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1953 "%s(): Unclaimed MAC %pM found. Claim it. Local: %s\n",
1954 __func__, ethhdr->h_source,
1955 batadv_is_my_client(bat_priv,
1956 ethhdr->h_source, vid) ?
1958 batadv_handle_claim(bat_priv, primary_if,
1959 primary_if->net_dev->dev_addr,
1960 ethhdr->h_source, vid);
1964 /* if it is our own claim ... */
1965 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1966 own_claim = batadv_compare_eth(backbone_gw->orig,
1967 primary_if->net_dev->dev_addr);
1968 batadv_backbone_gw_put(backbone_gw);
1971 /* ... allow it in any case */
1972 claim->lasttime = jiffies;
1976 /* if it is a multicast ... */
1977 if (is_multicast_ether_addr(ethhdr->h_dest) &&
1978 (packet_type == BATADV_BCAST || packet_type == BATADV_UNICAST)) {
1979 /* ... drop it. the responsible gateway is in charge.
1981 * We need to check packet type because with the gateway
1982 * feature, broadcasts (like DHCP requests) may be sent
1983 * using a unicast 4 address packet type. See comment above.
1987 /* seems the client considers us as its best gateway.
1988 * send a claim and update the claim table
1991 batadv_handle_claim(bat_priv, primary_if,
1992 primary_if->net_dev->dev_addr,
1993 ethhdr->h_source, vid);
1997 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
2006 batadv_hardif_put(primary_if);
2007 batadv_claim_put(claim);
2012 * batadv_bla_tx() - check packets going into the mesh
2013 * @bat_priv: the bat priv with all the soft interface information
2014 * @skb: the frame to be checked
2015 * @vid: the VLAN ID of the frame
2017 * batadv_bla_tx checks if:
2018 * * a claim was received which has to be processed
2019 * * the frame is allowed on the mesh
2021 * in these cases, the skb is further handled by this function.
2023 * This call might reallocate skb data.
2025 * Return: true if handled, otherwise it returns false and the caller shall
2026 * further process the skb.
2028 bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
2031 struct ethhdr *ethhdr;
2032 struct batadv_bla_claim search_claim, *claim = NULL;
2033 struct batadv_bla_backbone_gw *backbone_gw;
2034 struct batadv_hard_iface *primary_if;
2038 primary_if = batadv_primary_if_get_selected(bat_priv);
2042 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
2045 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
2048 ethhdr = eth_hdr(skb);
2050 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
2051 /* don't allow broadcasts while requests are in flight */
2052 if (is_multicast_ether_addr(ethhdr->h_dest))
2055 ether_addr_copy(search_claim.addr, ethhdr->h_source);
2056 search_claim.vid = vid;
2058 claim = batadv_claim_hash_find(bat_priv, &search_claim);
2060 /* if no claim exists, allow it. */
2064 /* check if we are responsible. */
2065 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
2066 client_roamed = batadv_compare_eth(backbone_gw->orig,
2067 primary_if->net_dev->dev_addr);
2068 batadv_backbone_gw_put(backbone_gw);
2070 if (client_roamed) {
2071 /* if yes, the client has roamed and we have
2074 if (batadv_has_timed_out(claim->lasttime, 100)) {
2075 /* only unclaim if the last claim entry is
2076 * older than 100 ms to make sure we really
2077 * have a roaming client here.
2079 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Roaming client %pM detected. Unclaim it.\n",
2080 __func__, ethhdr->h_source);
2081 batadv_handle_unclaim(bat_priv, primary_if,
2082 primary_if->net_dev->dev_addr,
2083 ethhdr->h_source, vid);
2086 batadv_dbg(BATADV_DBG_BLA, bat_priv, "%s(): Race for claim %pM detected. Drop packet.\n",
2087 __func__, ethhdr->h_source);
2092 /* check if it is a multicast/broadcast frame */
2093 if (is_multicast_ether_addr(ethhdr->h_dest)) {
2094 /* drop it. the responsible gateway has forwarded it into
2095 * the backbone network.
2099 /* we must allow it. at least if we are
2100 * responsible for the DESTINATION.
2105 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
2111 batadv_hardif_put(primary_if);
2112 batadv_claim_put(claim);
2117 * batadv_bla_claim_dump_entry() - dump one entry of the claim table
2118 * to a netlink socket
2119 * @msg: buffer for the message
2120 * @portid: netlink port
2121 * @cb: Control block containing additional options
2122 * @primary_if: primary interface
2123 * @claim: entry to dump
2125 * Return: 0 or error code.
2128 batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid,
2129 struct netlink_callback *cb,
2130 struct batadv_hard_iface *primary_if,
2131 struct batadv_bla_claim *claim)
2133 const u8 *primary_addr = primary_if->net_dev->dev_addr;
2139 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2140 &batadv_netlink_family, NLM_F_MULTI,
2141 BATADV_CMD_GET_BLA_CLAIM);
2147 genl_dump_check_consistent(cb, hdr);
2149 is_own = batadv_compare_eth(claim->backbone_gw->orig,
2152 spin_lock_bh(&claim->backbone_gw->crc_lock);
2153 backbone_crc = claim->backbone_gw->crc;
2154 spin_unlock_bh(&claim->backbone_gw->crc_lock);
2157 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2158 genlmsg_cancel(msg, hdr);
2162 if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
2163 nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
2164 nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2165 claim->backbone_gw->orig) ||
2166 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2168 genlmsg_cancel(msg, hdr);
2172 genlmsg_end(msg, hdr);
2180 * batadv_bla_claim_dump_bucket() - dump one bucket of the claim table
2181 * to a netlink socket
2182 * @msg: buffer for the message
2183 * @portid: netlink port
2184 * @cb: Control block containing additional options
2185 * @primary_if: primary interface
2186 * @hash: hash to dump
2187 * @bucket: bucket index to dump
2188 * @idx_skip: How many entries to skip
2193 batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid,
2194 struct netlink_callback *cb,
2195 struct batadv_hard_iface *primary_if,
2196 struct batadv_hashtable *hash, unsigned int bucket,
2199 struct batadv_bla_claim *claim;
2203 spin_lock_bh(&hash->list_locks[bucket]);
2204 cb->seq = atomic_read(&hash->generation) << 1 | 1;
2206 hlist_for_each_entry(claim, &hash->table[bucket], hash_entry) {
2207 if (idx++ < *idx_skip)
2210 ret = batadv_bla_claim_dump_entry(msg, portid, cb,
2213 *idx_skip = idx - 1;
2220 spin_unlock_bh(&hash->list_locks[bucket]);
2225 * batadv_bla_claim_dump() - dump claim table to a netlink socket
2226 * @msg: buffer for the message
2227 * @cb: callback structure containing arguments
2229 * Return: message length.
2231 int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
2233 struct batadv_hard_iface *primary_if = NULL;
2234 int portid = NETLINK_CB(cb->skb).portid;
2235 struct net *net = sock_net(cb->skb->sk);
2236 struct net_device *soft_iface;
2237 struct batadv_hashtable *hash;
2238 struct batadv_priv *bat_priv;
2239 int bucket = cb->args[0];
2240 int idx = cb->args[1];
2244 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2245 BATADV_ATTR_MESH_IFINDEX);
2249 soft_iface = dev_get_by_index(net, ifindex);
2250 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2255 bat_priv = netdev_priv(soft_iface);
2256 hash = bat_priv->bla.claim_hash;
2258 primary_if = batadv_primary_if_get_selected(bat_priv);
2259 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2264 while (bucket < hash->size) {
2265 if (batadv_bla_claim_dump_bucket(msg, portid, cb, primary_if,
2266 hash, bucket, &idx))
2271 cb->args[0] = bucket;
2277 batadv_hardif_put(primary_if);
2279 dev_put(soft_iface);
2285 * batadv_bla_backbone_dump_entry() - dump one entry of the backbone table to a
2287 * @msg: buffer for the message
2288 * @portid: netlink port
2289 * @cb: Control block containing additional options
2290 * @primary_if: primary interface
2291 * @backbone_gw: entry to dump
2293 * Return: 0 or error code.
2296 batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid,
2297 struct netlink_callback *cb,
2298 struct batadv_hard_iface *primary_if,
2299 struct batadv_bla_backbone_gw *backbone_gw)
2301 const u8 *primary_addr = primary_if->net_dev->dev_addr;
2308 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
2309 &batadv_netlink_family, NLM_F_MULTI,
2310 BATADV_CMD_GET_BLA_BACKBONE);
2316 genl_dump_check_consistent(cb, hdr);
2318 is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
2320 spin_lock_bh(&backbone_gw->crc_lock);
2321 backbone_crc = backbone_gw->crc;
2322 spin_unlock_bh(&backbone_gw->crc_lock);
2324 msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
2327 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2328 genlmsg_cancel(msg, hdr);
2332 if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2333 backbone_gw->orig) ||
2334 nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
2335 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2337 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
2338 genlmsg_cancel(msg, hdr);
2342 genlmsg_end(msg, hdr);
2350 * batadv_bla_backbone_dump_bucket() - dump one bucket of the backbone table to
2352 * @msg: buffer for the message
2353 * @portid: netlink port
2354 * @cb: Control block containing additional options
2355 * @primary_if: primary interface
2356 * @hash: hash to dump
2357 * @bucket: bucket index to dump
2358 * @idx_skip: How many entries to skip
2363 batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid,
2364 struct netlink_callback *cb,
2365 struct batadv_hard_iface *primary_if,
2366 struct batadv_hashtable *hash,
2367 unsigned int bucket, int *idx_skip)
2369 struct batadv_bla_backbone_gw *backbone_gw;
2373 spin_lock_bh(&hash->list_locks[bucket]);
2374 cb->seq = atomic_read(&hash->generation) << 1 | 1;
2376 hlist_for_each_entry(backbone_gw, &hash->table[bucket], hash_entry) {
2377 if (idx++ < *idx_skip)
2380 ret = batadv_bla_backbone_dump_entry(msg, portid, cb,
2381 primary_if, backbone_gw);
2383 *idx_skip = idx - 1;
2390 spin_unlock_bh(&hash->list_locks[bucket]);
2395 * batadv_bla_backbone_dump() - dump backbone table to a netlink socket
2396 * @msg: buffer for the message
2397 * @cb: callback structure containing arguments
2399 * Return: message length.
2401 int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
2403 struct batadv_hard_iface *primary_if = NULL;
2404 int portid = NETLINK_CB(cb->skb).portid;
2405 struct net *net = sock_net(cb->skb->sk);
2406 struct net_device *soft_iface;
2407 struct batadv_hashtable *hash;
2408 struct batadv_priv *bat_priv;
2409 int bucket = cb->args[0];
2410 int idx = cb->args[1];
2414 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2415 BATADV_ATTR_MESH_IFINDEX);
2419 soft_iface = dev_get_by_index(net, ifindex);
2420 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2425 bat_priv = netdev_priv(soft_iface);
2426 hash = bat_priv->bla.backbone_hash;
2428 primary_if = batadv_primary_if_get_selected(bat_priv);
2429 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2434 while (bucket < hash->size) {
2435 if (batadv_bla_backbone_dump_bucket(msg, portid, cb, primary_if,
2436 hash, bucket, &idx))
2441 cb->args[0] = bucket;
2447 batadv_hardif_put(primary_if);
2449 dev_put(soft_iface);
2454 #ifdef CONFIG_BATMAN_ADV_DAT
2456 * batadv_bla_check_claim() - check if address is claimed
2458 * @bat_priv: the bat priv with all the soft interface information
2459 * @addr: mac address of which the claim status is checked
2462 * addr is checked if this address is claimed by the local device itself.
2464 * Return: true if bla is disabled or the mac is claimed by the device,
2465 * false if the device addr is already claimed by another gateway
2467 bool batadv_bla_check_claim(struct batadv_priv *bat_priv,
2468 u8 *addr, unsigned short vid)
2470 struct batadv_bla_claim search_claim;
2471 struct batadv_bla_claim *claim = NULL;
2472 struct batadv_hard_iface *primary_if = NULL;
2475 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
2478 primary_if = batadv_primary_if_get_selected(bat_priv);
2482 /* First look if the mac address is claimed */
2483 ether_addr_copy(search_claim.addr, addr);
2484 search_claim.vid = vid;
2486 claim = batadv_claim_hash_find(bat_priv, &search_claim);
2488 /* If there is a claim and we are not owner of the claim,
2492 if (!batadv_compare_eth(claim->backbone_gw->orig,
2493 primary_if->net_dev->dev_addr))
2495 batadv_claim_put(claim);
2498 batadv_hardif_put(primary_if);