1 /* Copyright (C) 2011-2016 B.A.T.M.A.N. contributors:
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include "bridge_loop_avoidance.h"
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/compiler.h>
24 #include <linux/crc16.h>
25 #include <linux/errno.h>
26 #include <linux/etherdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_vlan.h>
31 #include <linux/jhash.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/kref.h>
35 #include <linux/list.h>
36 #include <linux/lockdep.h>
37 #include <linux/netdevice.h>
38 #include <linux/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);
452 soft_iface->last_rx = jiffies;
457 batadv_hardif_put(primary_if);
461 * batadv_bla_loopdetect_report - worker for reporting the loop
462 * @work: work queue item
464 * Throws an uevent, as the loopdetect check function can't do that itself
465 * since the kernel may sleep while throwing uevents.
467 static void batadv_bla_loopdetect_report(struct work_struct *work)
469 struct batadv_bla_backbone_gw *backbone_gw;
470 struct batadv_priv *bat_priv;
471 char vid_str[6] = { '\0' };
473 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
475 bat_priv = backbone_gw->bat_priv;
477 batadv_info(bat_priv->soft_iface,
478 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
479 BATADV_PRINT_VID(backbone_gw->vid));
480 snprintf(vid_str, sizeof(vid_str), "%d",
481 BATADV_PRINT_VID(backbone_gw->vid));
482 vid_str[sizeof(vid_str) - 1] = 0;
484 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
487 batadv_backbone_gw_put(backbone_gw);
491 * batadv_bla_get_backbone_gw - finds or creates a backbone gateway
492 * @bat_priv: the bat priv with all the soft interface information
493 * @orig: the mac address of the originator
495 * @own_backbone: set if the requested backbone is local
497 * Return: the (possibly created) backbone gateway or NULL on error
499 static struct batadv_bla_backbone_gw *
500 batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
501 unsigned short vid, bool own_backbone)
503 struct batadv_bla_backbone_gw *entry;
504 struct batadv_orig_node *orig_node;
507 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
512 batadv_dbg(BATADV_DBG_BLA, bat_priv,
513 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
514 orig, BATADV_PRINT_VID(vid));
516 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
521 entry->lasttime = jiffies;
522 entry->crc = BATADV_BLA_CRC_INIT;
523 entry->bat_priv = bat_priv;
524 spin_lock_init(&entry->crc_lock);
525 atomic_set(&entry->request_sent, 0);
526 atomic_set(&entry->wait_periods, 0);
527 ether_addr_copy(entry->orig, orig);
528 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
529 kref_init(&entry->refcount);
531 kref_get(&entry->refcount);
532 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
533 batadv_compare_backbone_gw,
534 batadv_choose_backbone_gw, entry,
537 if (unlikely(hash_added != 0)) {
538 /* hash failed, free the structure */
543 /* this is a gateway now, remove any TT entry on this VLAN */
544 orig_node = batadv_orig_hash_find(bat_priv, orig);
546 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
547 "became a backbone gateway");
548 batadv_orig_node_put(orig_node);
552 batadv_bla_send_announce(bat_priv, entry);
554 /* this will be decreased in the worker thread */
555 atomic_inc(&entry->request_sent);
556 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
557 atomic_inc(&bat_priv->bla.num_requests);
564 * batadv_bla_update_own_backbone_gw - updates the own backbone gw for a VLAN
565 * @bat_priv: the bat priv with all the soft interface information
566 * @primary_if: the selected primary interface
567 * @vid: VLAN identifier
569 * update or add the own backbone gw to make sure we announce
570 * where we receive other backbone gws
573 batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
574 struct batadv_hard_iface *primary_if,
577 struct batadv_bla_backbone_gw *backbone_gw;
579 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
580 primary_if->net_dev->dev_addr,
582 if (unlikely(!backbone_gw))
585 backbone_gw->lasttime = jiffies;
586 batadv_backbone_gw_put(backbone_gw);
590 * batadv_bla_answer_request - answer a bla request by sending own claims
591 * @bat_priv: the bat priv with all the soft interface information
592 * @primary_if: interface where the request came on
593 * @vid: the vid where the request came on
595 * Repeat all of our own claims, and finally send an ANNOUNCE frame
596 * to allow the requester another check if the CRC is correct now.
598 static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
599 struct batadv_hard_iface *primary_if,
602 struct hlist_head *head;
603 struct batadv_hashtable *hash;
604 struct batadv_bla_claim *claim;
605 struct batadv_bla_backbone_gw *backbone_gw;
608 batadv_dbg(BATADV_DBG_BLA, bat_priv,
609 "bla_answer_request(): received a claim request, send all of our own claims again\n");
611 backbone_gw = batadv_backbone_hash_find(bat_priv,
612 primary_if->net_dev->dev_addr,
617 hash = bat_priv->bla.claim_hash;
618 for (i = 0; i < hash->size; i++) {
619 head = &hash->table[i];
622 hlist_for_each_entry_rcu(claim, head, hash_entry) {
623 /* only own claims are interesting */
624 if (claim->backbone_gw != backbone_gw)
627 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
628 BATADV_CLAIM_TYPE_CLAIM);
633 /* finally, send an announcement frame */
634 batadv_bla_send_announce(bat_priv, backbone_gw);
635 batadv_backbone_gw_put(backbone_gw);
639 * batadv_bla_send_request - send a request to repeat claims
640 * @backbone_gw: the backbone gateway from whom we are out of sync
642 * When the crc is wrong, ask the backbone gateway for a full table update.
643 * After the request, it will repeat all of his own claims and finally
644 * send an announcement claim with which we can check again.
646 static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
648 /* first, remove all old entries */
649 batadv_bla_del_backbone_claims(backbone_gw);
651 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
652 "Sending REQUEST to %pM\n", backbone_gw->orig);
655 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
656 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
658 /* no local broadcasts should be sent or received, for now. */
659 if (!atomic_read(&backbone_gw->request_sent)) {
660 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
661 atomic_set(&backbone_gw->request_sent, 1);
666 * batadv_bla_send_announce - Send an announcement frame
667 * @bat_priv: the bat priv with all the soft interface information
668 * @backbone_gw: our backbone gateway which should be announced
670 static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
671 struct batadv_bla_backbone_gw *backbone_gw)
676 memcpy(mac, batadv_announce_mac, 4);
677 spin_lock_bh(&backbone_gw->crc_lock);
678 crc = htons(backbone_gw->crc);
679 spin_unlock_bh(&backbone_gw->crc_lock);
680 memcpy(&mac[4], &crc, 2);
682 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
683 BATADV_CLAIM_TYPE_ANNOUNCE);
687 * batadv_bla_add_claim - Adds a claim in the claim hash
688 * @bat_priv: the bat priv with all the soft interface information
689 * @mac: the mac address of the claim
690 * @vid: the VLAN ID of the frame
691 * @backbone_gw: the backbone gateway which claims it
693 static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
694 const u8 *mac, const unsigned short vid,
695 struct batadv_bla_backbone_gw *backbone_gw)
697 struct batadv_bla_backbone_gw *old_backbone_gw;
698 struct batadv_bla_claim *claim;
699 struct batadv_bla_claim search_claim;
700 bool remove_crc = false;
703 ether_addr_copy(search_claim.addr, mac);
704 search_claim.vid = vid;
705 claim = batadv_claim_hash_find(bat_priv, &search_claim);
707 /* create a new claim entry if it does not exist yet. */
709 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
713 ether_addr_copy(claim->addr, mac);
714 spin_lock_init(&claim->backbone_lock);
716 claim->lasttime = jiffies;
717 kref_get(&backbone_gw->refcount);
718 claim->backbone_gw = backbone_gw;
719 kref_init(&claim->refcount);
721 batadv_dbg(BATADV_DBG_BLA, bat_priv,
722 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
723 mac, BATADV_PRINT_VID(vid));
725 kref_get(&claim->refcount);
726 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
727 batadv_compare_claim,
728 batadv_choose_claim, claim,
731 if (unlikely(hash_added != 0)) {
732 /* only local changes happened. */
737 claim->lasttime = jiffies;
738 if (claim->backbone_gw == backbone_gw)
739 /* no need to register a new backbone */
742 batadv_dbg(BATADV_DBG_BLA, bat_priv,
743 "bla_add_claim(): changing ownership for %pM, vid %d\n",
744 mac, BATADV_PRINT_VID(vid));
749 /* replace backbone_gw atomically and adjust reference counters */
750 spin_lock_bh(&claim->backbone_lock);
751 old_backbone_gw = claim->backbone_gw;
752 kref_get(&backbone_gw->refcount);
753 claim->backbone_gw = backbone_gw;
754 spin_unlock_bh(&claim->backbone_lock);
757 /* remove claim address from old backbone_gw */
758 spin_lock_bh(&old_backbone_gw->crc_lock);
759 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
760 spin_unlock_bh(&old_backbone_gw->crc_lock);
763 batadv_backbone_gw_put(old_backbone_gw);
765 /* add claim address to new backbone_gw */
766 spin_lock_bh(&backbone_gw->crc_lock);
767 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
768 spin_unlock_bh(&backbone_gw->crc_lock);
769 backbone_gw->lasttime = jiffies;
772 batadv_claim_put(claim);
776 * batadv_bla_claim_get_backbone_gw - Get valid reference for backbone_gw of
778 * @claim: claim whose backbone_gw should be returned
780 * Return: valid reference to claim::backbone_gw
782 static struct batadv_bla_backbone_gw *
783 batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
785 struct batadv_bla_backbone_gw *backbone_gw;
787 spin_lock_bh(&claim->backbone_lock);
788 backbone_gw = claim->backbone_gw;
789 kref_get(&backbone_gw->refcount);
790 spin_unlock_bh(&claim->backbone_lock);
796 * batadv_bla_del_claim - delete a claim from the claim hash
797 * @bat_priv: the bat priv with all the soft interface information
798 * @mac: mac address of the claim to be removed
799 * @vid: VLAN id for the claim to be removed
801 static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
802 const u8 *mac, const unsigned short vid)
804 struct batadv_bla_claim search_claim, *claim;
806 ether_addr_copy(search_claim.addr, mac);
807 search_claim.vid = vid;
808 claim = batadv_claim_hash_find(bat_priv, &search_claim);
812 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
813 mac, BATADV_PRINT_VID(vid));
815 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
816 batadv_choose_claim, claim);
817 batadv_claim_put(claim); /* reference from the hash is gone */
819 /* don't need the reference from hash_find() anymore */
820 batadv_claim_put(claim);
824 * batadv_handle_announce - check for ANNOUNCE frame
825 * @bat_priv: the bat priv with all the soft interface information
826 * @an_addr: announcement mac address (ARP Sender HW address)
827 * @backbone_addr: originator address of the sender (Ethernet source MAC)
828 * @vid: the VLAN ID of the frame
830 * Return: true if handled
832 static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
833 u8 *backbone_addr, unsigned short vid)
835 struct batadv_bla_backbone_gw *backbone_gw;
836 u16 backbone_crc, crc;
838 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
841 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
844 if (unlikely(!backbone_gw))
847 /* handle as ANNOUNCE frame */
848 backbone_gw->lasttime = jiffies;
849 crc = ntohs(*((__be16 *)(&an_addr[4])));
851 batadv_dbg(BATADV_DBG_BLA, bat_priv,
852 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
853 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
855 spin_lock_bh(&backbone_gw->crc_lock);
856 backbone_crc = backbone_gw->crc;
857 spin_unlock_bh(&backbone_gw->crc_lock);
859 if (backbone_crc != crc) {
860 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
861 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
863 BATADV_PRINT_VID(backbone_gw->vid),
866 batadv_bla_send_request(backbone_gw);
868 /* if we have sent a request and the crc was OK,
869 * we can allow traffic again.
871 if (atomic_read(&backbone_gw->request_sent)) {
872 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
873 atomic_set(&backbone_gw->request_sent, 0);
877 batadv_backbone_gw_put(backbone_gw);
882 * batadv_handle_request - check for REQUEST frame
883 * @bat_priv: the bat priv with all the soft interface information
884 * @primary_if: the primary hard interface of this batman soft interface
885 * @backbone_addr: backbone address to be requested (ARP sender HW MAC)
886 * @ethhdr: ethernet header of a packet
887 * @vid: the VLAN ID of the frame
889 * Return: true if handled
891 static bool batadv_handle_request(struct batadv_priv *bat_priv,
892 struct batadv_hard_iface *primary_if,
893 u8 *backbone_addr, struct ethhdr *ethhdr,
896 /* check for REQUEST frame */
897 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
900 /* sanity check, this should not happen on a normal switch,
901 * we ignore it in this case.
903 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
906 batadv_dbg(BATADV_DBG_BLA, bat_priv,
907 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
908 BATADV_PRINT_VID(vid), ethhdr->h_source);
910 batadv_bla_answer_request(bat_priv, primary_if, vid);
915 * batadv_handle_unclaim - check for UNCLAIM frame
916 * @bat_priv: the bat priv with all the soft interface information
917 * @primary_if: the primary hard interface of this batman soft interface
918 * @backbone_addr: originator address of the backbone (Ethernet source)
919 * @claim_addr: Client to be unclaimed (ARP sender HW MAC)
920 * @vid: the VLAN ID of the frame
922 * Return: true if handled
924 static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
925 struct batadv_hard_iface *primary_if,
926 u8 *backbone_addr, u8 *claim_addr,
929 struct batadv_bla_backbone_gw *backbone_gw;
931 /* unclaim in any case if it is our own */
932 if (primary_if && batadv_compare_eth(backbone_addr,
933 primary_if->net_dev->dev_addr))
934 batadv_bla_send_claim(bat_priv, claim_addr, vid,
935 BATADV_CLAIM_TYPE_UNCLAIM);
937 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
942 /* this must be an UNCLAIM frame */
943 batadv_dbg(BATADV_DBG_BLA, bat_priv,
944 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
945 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
947 batadv_bla_del_claim(bat_priv, claim_addr, vid);
948 batadv_backbone_gw_put(backbone_gw);
953 * batadv_handle_claim - check for CLAIM frame
954 * @bat_priv: the bat priv with all the soft interface information
955 * @primary_if: the primary hard interface of this batman soft interface
956 * @backbone_addr: originator address of the backbone (Ethernet Source)
957 * @claim_addr: client mac address to be claimed (ARP sender HW MAC)
958 * @vid: the VLAN ID of the frame
960 * Return: true if handled
962 static bool batadv_handle_claim(struct batadv_priv *bat_priv,
963 struct batadv_hard_iface *primary_if,
964 u8 *backbone_addr, u8 *claim_addr,
967 struct batadv_bla_backbone_gw *backbone_gw;
969 /* register the gateway if not yet available, and add the claim. */
971 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
974 if (unlikely(!backbone_gw))
977 /* this must be a CLAIM frame */
978 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
979 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
980 batadv_bla_send_claim(bat_priv, claim_addr, vid,
981 BATADV_CLAIM_TYPE_CLAIM);
983 /* TODO: we could call something like tt_local_del() here. */
985 batadv_backbone_gw_put(backbone_gw);
990 * batadv_check_claim_group - check for claim group membership
991 * @bat_priv: the bat priv with all the soft interface information
992 * @primary_if: the primary interface of this batman interface
993 * @hw_src: the Hardware source in the ARP Header
994 * @hw_dst: the Hardware destination in the ARP Header
995 * @ethhdr: pointer to the Ethernet header of the claim frame
997 * checks if it is a claim packet and if its on the same group.
998 * This function also applies the group ID of the sender
999 * if it is in the same mesh.
1002 * 2 - if it is a claim packet and on the same group
1003 * 1 - if is a claim packet from another group
1004 * 0 - if it is not a claim packet
1006 static int batadv_check_claim_group(struct batadv_priv *bat_priv,
1007 struct batadv_hard_iface *primary_if,
1008 u8 *hw_src, u8 *hw_dst,
1009 struct ethhdr *ethhdr)
1012 struct batadv_orig_node *orig_node;
1013 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1015 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1016 bla_dst_own = &bat_priv->bla.claim_dest;
1018 /* if announcement packet, use the source,
1019 * otherwise assume it is in the hw_src
1021 switch (bla_dst->type) {
1022 case BATADV_CLAIM_TYPE_CLAIM:
1023 backbone_addr = hw_src;
1025 case BATADV_CLAIM_TYPE_REQUEST:
1026 case BATADV_CLAIM_TYPE_ANNOUNCE:
1027 case BATADV_CLAIM_TYPE_UNCLAIM:
1028 backbone_addr = ethhdr->h_source;
1034 /* don't accept claim frames from ourselves */
1035 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
1038 /* if its already the same group, it is fine. */
1039 if (bla_dst->group == bla_dst_own->group)
1042 /* lets see if this originator is in our mesh */
1043 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
1045 /* dont accept claims from gateways which are not in
1046 * the same mesh or group.
1051 /* if our mesh friends mac is bigger, use it for ourselves. */
1052 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
1053 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1054 "taking other backbones claim group: %#.4x\n",
1055 ntohs(bla_dst->group));
1056 bla_dst_own->group = bla_dst->group;
1059 batadv_orig_node_put(orig_node);
1065 * batadv_bla_process_claim - Check if this is a claim frame, and process it
1066 * @bat_priv: the bat priv with all the soft interface information
1067 * @primary_if: the primary hard interface of this batman soft interface
1068 * @skb: the frame to be checked
1070 * Return: true if it was a claim frame, otherwise return false to
1071 * tell the callee that it can use the frame on its own.
1073 static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1074 struct batadv_hard_iface *primary_if,
1075 struct sk_buff *skb)
1077 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1078 u8 *hw_src, *hw_dst;
1079 struct vlan_hdr *vhdr, vhdr_buf;
1080 struct ethhdr *ethhdr;
1081 struct arphdr *arphdr;
1088 vid = batadv_get_vid(skb, 0);
1089 ethhdr = eth_hdr(skb);
1091 proto = ethhdr->h_proto;
1093 if (vid & BATADV_VLAN_HAS_TAG) {
1094 /* Traverse the VLAN/Ethertypes.
1096 * At this point it is known that the first protocol is a VLAN
1097 * header, so start checking at the encapsulated protocol.
1099 * The depth of the VLAN headers is recorded to drop BLA claim
1100 * frames encapsulated into multiple VLAN headers (QinQ).
1103 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1108 proto = vhdr->h_vlan_encapsulated_proto;
1109 headlen += VLAN_HLEN;
1111 } while (proto == htons(ETH_P_8021Q));
1114 if (proto != htons(ETH_P_ARP))
1115 return false; /* not a claim frame */
1117 /* this must be a ARP frame. check if it is a claim. */
1119 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1122 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
1123 ethhdr = eth_hdr(skb);
1124 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
1126 /* Check whether the ARP frame carries a valid
1129 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1131 if (arphdr->ar_pro != htons(ETH_P_IP))
1133 if (arphdr->ar_hln != ETH_ALEN)
1135 if (arphdr->ar_pln != 4)
1138 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
1139 hw_dst = hw_src + ETH_ALEN + 4;
1140 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1141 bla_dst_own = &bat_priv->bla.claim_dest;
1143 /* check if it is a claim frame in general */
1144 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1145 sizeof(bla_dst->magic)) != 0)
1148 /* check if there is a claim frame encapsulated deeper in (QinQ) and
1149 * drop that, as this is not supported by BLA but should also not be
1150 * sent via the mesh.
1155 /* Let the loopdetect frames on the mesh in any case. */
1156 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
1159 /* check if it is a claim frame. */
1160 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1163 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1164 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1165 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
1171 /* become a backbone gw ourselves on this vlan if not happened yet */
1172 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1174 /* check for the different types of claim frames ... */
1175 switch (bla_dst->type) {
1176 case BATADV_CLAIM_TYPE_CLAIM:
1177 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1178 ethhdr->h_source, vid))
1181 case BATADV_CLAIM_TYPE_UNCLAIM:
1182 if (batadv_handle_unclaim(bat_priv, primary_if,
1183 ethhdr->h_source, hw_src, vid))
1187 case BATADV_CLAIM_TYPE_ANNOUNCE:
1188 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1192 case BATADV_CLAIM_TYPE_REQUEST:
1193 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1199 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1200 "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",
1201 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
1206 * batadv_bla_purge_backbone_gw - Remove backbone gateways after a timeout or
1208 * @bat_priv: the bat priv with all the soft interface information
1209 * @now: whether the whole hash shall be wiped now
1211 * Check when we last heard from other nodes, and remove them in case of
1212 * a time out, or clean all backbone gws if now is set.
1214 static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1216 struct batadv_bla_backbone_gw *backbone_gw;
1217 struct hlist_node *node_tmp;
1218 struct hlist_head *head;
1219 struct batadv_hashtable *hash;
1220 spinlock_t *list_lock; /* protects write access to the hash lists */
1223 hash = bat_priv->bla.backbone_hash;
1227 for (i = 0; i < hash->size; i++) {
1228 head = &hash->table[i];
1229 list_lock = &hash->list_locks[i];
1231 spin_lock_bh(list_lock);
1232 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1236 if (!batadv_has_timed_out(backbone_gw->lasttime,
1237 BATADV_BLA_BACKBONE_TIMEOUT))
1240 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1241 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1245 /* don't wait for the pending request anymore */
1246 if (atomic_read(&backbone_gw->request_sent))
1247 atomic_dec(&bat_priv->bla.num_requests);
1249 batadv_bla_del_backbone_claims(backbone_gw);
1251 hlist_del_rcu(&backbone_gw->hash_entry);
1252 batadv_backbone_gw_put(backbone_gw);
1254 spin_unlock_bh(list_lock);
1259 * batadv_bla_purge_claims - Remove claims after a timeout or immediately
1260 * @bat_priv: the bat priv with all the soft interface information
1261 * @primary_if: the selected primary interface, may be NULL if now is set
1262 * @now: whether the whole hash shall be wiped now
1264 * Check when we heard last time from our own claims, and remove them in case of
1265 * a time out, or clean all claims if now is set
1267 static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1268 struct batadv_hard_iface *primary_if,
1271 struct batadv_bla_backbone_gw *backbone_gw;
1272 struct batadv_bla_claim *claim;
1273 struct hlist_head *head;
1274 struct batadv_hashtable *hash;
1277 hash = bat_priv->bla.claim_hash;
1281 for (i = 0; i < hash->size; i++) {
1282 head = &hash->table[i];
1285 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1286 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1290 if (!batadv_compare_eth(backbone_gw->orig,
1291 primary_if->net_dev->dev_addr))
1294 if (!batadv_has_timed_out(claim->lasttime,
1295 BATADV_BLA_CLAIM_TIMEOUT))
1298 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1299 "bla_purge_claims(): %pM, vid %d, time out\n",
1300 claim->addr, claim->vid);
1303 batadv_handle_unclaim(bat_priv, primary_if,
1305 claim->addr, claim->vid);
1307 batadv_backbone_gw_put(backbone_gw);
1314 * batadv_bla_update_orig_address - Update the backbone gateways when the own
1315 * originator address changes
1316 * @bat_priv: the bat priv with all the soft interface information
1317 * @primary_if: the new selected primary_if
1318 * @oldif: the old primary interface, may be NULL
1320 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1321 struct batadv_hard_iface *primary_if,
1322 struct batadv_hard_iface *oldif)
1324 struct batadv_bla_backbone_gw *backbone_gw;
1325 struct hlist_head *head;
1326 struct batadv_hashtable *hash;
1330 /* reset bridge loop avoidance group id */
1331 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1332 bat_priv->bla.claim_dest.group = group;
1334 /* purge everything when bridge loop avoidance is turned off */
1335 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1339 batadv_bla_purge_claims(bat_priv, NULL, 1);
1340 batadv_bla_purge_backbone_gw(bat_priv, 1);
1344 hash = bat_priv->bla.backbone_hash;
1348 for (i = 0; i < hash->size; i++) {
1349 head = &hash->table[i];
1352 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1353 /* own orig still holds the old value. */
1354 if (!batadv_compare_eth(backbone_gw->orig,
1355 oldif->net_dev->dev_addr))
1358 ether_addr_copy(backbone_gw->orig,
1359 primary_if->net_dev->dev_addr);
1360 /* send an announce frame so others will ask for our
1361 * claims and update their tables.
1363 batadv_bla_send_announce(bat_priv, backbone_gw);
1370 * batadv_bla_send_loopdetect - send a loopdetect frame
1371 * @bat_priv: the bat priv with all the soft interface information
1372 * @backbone_gw: the backbone gateway for which a loop should be detected
1374 * To detect loops that the bridge loop avoidance can't handle, send a loop
1375 * detection packet on the backbone. Unlike other BLA frames, this frame will
1376 * be allowed on the mesh by other nodes. If it is received on the mesh, this
1377 * indicates that there is a loop.
1380 batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1381 struct batadv_bla_backbone_gw *backbone_gw)
1383 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1385 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1386 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1390 * batadv_bla_status_update - purge bla interfaces if necessary
1391 * @net_dev: the soft interface net device
1393 void batadv_bla_status_update(struct net_device *net_dev)
1395 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1396 struct batadv_hard_iface *primary_if;
1398 primary_if = batadv_primary_if_get_selected(bat_priv);
1402 /* this function already purges everything when bla is disabled,
1403 * so just call that one.
1405 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1406 batadv_hardif_put(primary_if);
1410 * batadv_bla_periodic_work - performs periodic bla work
1411 * @work: kernel work struct
1413 * periodic work to do:
1414 * * purge structures when they are too old
1415 * * send announcements
1417 static void batadv_bla_periodic_work(struct work_struct *work)
1419 struct delayed_work *delayed_work;
1420 struct batadv_priv *bat_priv;
1421 struct batadv_priv_bla *priv_bla;
1422 struct hlist_head *head;
1423 struct batadv_bla_backbone_gw *backbone_gw;
1424 struct batadv_hashtable *hash;
1425 struct batadv_hard_iface *primary_if;
1426 bool send_loopdetect = false;
1429 delayed_work = to_delayed_work(work);
1430 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1431 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1432 primary_if = batadv_primary_if_get_selected(bat_priv);
1436 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1437 batadv_bla_purge_backbone_gw(bat_priv, 0);
1439 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1442 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1443 /* set a new random mac address for the next bridge loop
1444 * detection frames. Set the locally administered bit to avoid
1445 * collisions with users mac addresses.
1447 random_ether_addr(bat_priv->bla.loopdetect_addr);
1448 bat_priv->bla.loopdetect_addr[0] = 0xba;
1449 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1450 bat_priv->bla.loopdetect_lasttime = jiffies;
1451 atomic_set(&bat_priv->bla.loopdetect_next,
1452 BATADV_BLA_LOOPDETECT_PERIODS);
1454 /* mark for sending loop detect on all VLANs */
1455 send_loopdetect = true;
1458 hash = bat_priv->bla.backbone_hash;
1462 for (i = 0; i < hash->size; i++) {
1463 head = &hash->table[i];
1466 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1467 if (!batadv_compare_eth(backbone_gw->orig,
1468 primary_if->net_dev->dev_addr))
1471 backbone_gw->lasttime = jiffies;
1473 batadv_bla_send_announce(bat_priv, backbone_gw);
1474 if (send_loopdetect)
1475 batadv_bla_send_loopdetect(bat_priv,
1478 /* request_sent is only set after creation to avoid
1479 * problems when we are not yet known as backbone gw
1482 * We can reset this now after we waited some periods
1483 * to give bridge forward delays and bla group forming
1487 if (atomic_read(&backbone_gw->request_sent) == 0)
1490 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1493 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1494 atomic_set(&backbone_gw->request_sent, 0);
1500 batadv_hardif_put(primary_if);
1502 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1503 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1506 /* The hash for claim and backbone hash receive the same key because they
1507 * are getting initialized by hash_new with the same key. Reinitializing
1508 * them with to different keys to allow nested locking without generating
1511 static struct lock_class_key batadv_claim_hash_lock_class_key;
1512 static struct lock_class_key batadv_backbone_hash_lock_class_key;
1515 * batadv_bla_init - initialize all bla structures
1516 * @bat_priv: the bat priv with all the soft interface information
1518 * Return: 0 on success, < 0 on error.
1520 int batadv_bla_init(struct batadv_priv *bat_priv)
1523 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1524 struct batadv_hard_iface *primary_if;
1526 unsigned long entrytime;
1528 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1530 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1532 /* setting claim destination address */
1533 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1534 bat_priv->bla.claim_dest.type = 0;
1535 primary_if = batadv_primary_if_get_selected(bat_priv);
1537 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1538 bat_priv->bla.claim_dest.group = htons(crc);
1539 batadv_hardif_put(primary_if);
1541 bat_priv->bla.claim_dest.group = 0; /* will be set later */
1544 /* initialize the duplicate list */
1545 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1546 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1547 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1548 bat_priv->bla.bcast_duplist_curr = 0;
1550 atomic_set(&bat_priv->bla.loopdetect_next,
1551 BATADV_BLA_LOOPDETECT_PERIODS);
1553 if (bat_priv->bla.claim_hash)
1556 bat_priv->bla.claim_hash = batadv_hash_new(128);
1557 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1559 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1562 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1563 &batadv_claim_hash_lock_class_key);
1564 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1565 &batadv_backbone_hash_lock_class_key);
1567 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1569 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1571 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1572 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1577 * batadv_bla_check_bcast_duplist - Check if a frame is in the broadcast dup.
1578 * @bat_priv: the bat priv with all the soft interface information
1579 * @skb: contains the bcast_packet to be checked
1581 * check if it is on our broadcast list. Another gateway might
1582 * have sent the same packet because it is connected to the same backbone,
1583 * so we have to remove this duplicate.
1585 * This is performed by checking the CRC, which will tell us
1586 * with a good chance that it is the same packet. If it is furthermore
1587 * sent by another host, drop it. We allow equal packets from
1588 * the same host however as this might be intended.
1590 * Return: true if a packet is in the duplicate list, false otherwise.
1592 bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1593 struct sk_buff *skb)
1597 struct batadv_bcast_packet *bcast_packet;
1598 struct batadv_bcast_duplist_entry *entry;
1601 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1603 /* calculate the crc ... */
1604 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1606 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1608 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1609 curr = (bat_priv->bla.bcast_duplist_curr + i);
1610 curr %= BATADV_DUPLIST_SIZE;
1611 entry = &bat_priv->bla.bcast_duplist[curr];
1613 /* we can stop searching if the entry is too old ;
1614 * later entries will be even older
1616 if (batadv_has_timed_out(entry->entrytime,
1617 BATADV_DUPLIST_TIMEOUT))
1620 if (entry->crc != crc)
1623 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1626 /* this entry seems to match: same crc, not too old,
1627 * and from another gw. therefore return true to forbid it.
1632 /* not found, add a new entry (overwrite the oldest entry)
1633 * and allow it, its the first occurrence.
1635 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1636 curr %= BATADV_DUPLIST_SIZE;
1637 entry = &bat_priv->bla.bcast_duplist[curr];
1639 entry->entrytime = jiffies;
1640 ether_addr_copy(entry->orig, bcast_packet->orig);
1641 bat_priv->bla.bcast_duplist_curr = curr;
1644 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1650 * batadv_bla_is_backbone_gw_orig - Check if the originator is a gateway for
1651 * the VLAN identified by vid.
1652 * @bat_priv: the bat priv with all the soft interface information
1653 * @orig: originator mac address
1654 * @vid: VLAN identifier
1656 * Return: true if orig is a backbone for this vid, false otherwise.
1658 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1661 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1662 struct hlist_head *head;
1663 struct batadv_bla_backbone_gw *backbone_gw;
1666 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1672 for (i = 0; i < hash->size; i++) {
1673 head = &hash->table[i];
1676 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1677 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1678 backbone_gw->vid == vid) {
1690 * batadv_bla_is_backbone_gw - check if originator is a backbone gw for a VLAN.
1691 * @skb: the frame to be checked
1692 * @orig_node: the orig_node of the frame
1693 * @hdr_size: maximum length of the frame
1695 * Return: true if the orig_node is also a gateway on the soft interface,
1696 * otherwise it returns false.
1698 bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1699 struct batadv_orig_node *orig_node, int hdr_size)
1701 struct batadv_bla_backbone_gw *backbone_gw;
1704 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1707 /* first, find out the vid. */
1708 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1711 vid = batadv_get_vid(skb, hdr_size);
1713 /* see if this originator is a backbone gw for this VLAN */
1714 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1715 orig_node->orig, vid);
1719 batadv_backbone_gw_put(backbone_gw);
1724 * batadv_bla_free - free all bla structures
1725 * @bat_priv: the bat priv with all the soft interface information
1727 * for softinterface free or module unload
1729 void batadv_bla_free(struct batadv_priv *bat_priv)
1731 struct batadv_hard_iface *primary_if;
1733 cancel_delayed_work_sync(&bat_priv->bla.work);
1734 primary_if = batadv_primary_if_get_selected(bat_priv);
1736 if (bat_priv->bla.claim_hash) {
1737 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1738 batadv_hash_destroy(bat_priv->bla.claim_hash);
1739 bat_priv->bla.claim_hash = NULL;
1741 if (bat_priv->bla.backbone_hash) {
1742 batadv_bla_purge_backbone_gw(bat_priv, 1);
1743 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1744 bat_priv->bla.backbone_hash = NULL;
1747 batadv_hardif_put(primary_if);
1751 * batadv_bla_loopdetect_check - check and handle a detected loop
1752 * @bat_priv: the bat priv with all the soft interface information
1753 * @skb: the packet to check
1754 * @primary_if: interface where the request came on
1755 * @vid: the VLAN ID of the frame
1757 * Checks if this packet is a loop detect frame which has been sent by us,
1758 * throw an uevent and log the event if that is the case.
1760 * Return: true if it is a loop detect frame which is to be dropped, false
1764 batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1765 struct batadv_hard_iface *primary_if,
1768 struct batadv_bla_backbone_gw *backbone_gw;
1769 struct ethhdr *ethhdr;
1771 ethhdr = eth_hdr(skb);
1773 /* Only check for the MAC address and skip more checks here for
1774 * performance reasons - this function is on the hotpath, after all.
1776 if (!batadv_compare_eth(ethhdr->h_source,
1777 bat_priv->bla.loopdetect_addr))
1780 /* If the packet came too late, don't forward it on the mesh
1781 * but don't consider that as loop. It might be a coincidence.
1783 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1784 BATADV_BLA_LOOPDETECT_TIMEOUT))
1787 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1788 primary_if->net_dev->dev_addr,
1790 if (unlikely(!backbone_gw))
1793 queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1794 /* backbone_gw is unreferenced in the report work function function */
1800 * batadv_bla_rx - check packets coming from the mesh.
1801 * @bat_priv: the bat priv with all the soft interface information
1802 * @skb: the frame to be checked
1803 * @vid: the VLAN ID of the frame
1804 * @is_bcast: the packet came in a broadcast packet type.
1806 * batadv_bla_rx avoidance checks if:
1807 * * we have to race for a claim
1808 * * if the frame is allowed on the LAN
1810 * in these cases, the skb is further handled by this function
1812 * Return: true if handled, otherwise it returns false and the caller shall
1813 * further process the skb.
1815 bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1816 unsigned short vid, bool is_bcast)
1818 struct batadv_bla_backbone_gw *backbone_gw;
1819 struct ethhdr *ethhdr;
1820 struct batadv_bla_claim search_claim, *claim = NULL;
1821 struct batadv_hard_iface *primary_if;
1825 ethhdr = eth_hdr(skb);
1827 primary_if = batadv_primary_if_get_selected(bat_priv);
1831 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1834 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1837 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1838 /* don't allow broadcasts while requests are in flight */
1839 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1842 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1843 search_claim.vid = vid;
1844 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1847 /* possible optimization: race for a claim */
1848 /* No claim exists yet, claim it for us!
1850 batadv_handle_claim(bat_priv, primary_if,
1851 primary_if->net_dev->dev_addr,
1852 ethhdr->h_source, vid);
1856 /* if it is our own claim ... */
1857 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1858 own_claim = batadv_compare_eth(backbone_gw->orig,
1859 primary_if->net_dev->dev_addr);
1860 batadv_backbone_gw_put(backbone_gw);
1863 /* ... allow it in any case */
1864 claim->lasttime = jiffies;
1868 /* if it is a broadcast ... */
1869 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1870 /* ... drop it. the responsible gateway is in charge.
1872 * We need to check is_bcast because with the gateway
1873 * feature, broadcasts (like DHCP requests) may be sent
1874 * using a unicast packet type.
1878 /* seems the client considers us as its best gateway.
1879 * send a claim and update the claim table
1882 batadv_handle_claim(bat_priv, primary_if,
1883 primary_if->net_dev->dev_addr,
1884 ethhdr->h_source, vid);
1888 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1898 batadv_hardif_put(primary_if);
1900 batadv_claim_put(claim);
1905 * batadv_bla_tx - check packets going into the mesh
1906 * @bat_priv: the bat priv with all the soft interface information
1907 * @skb: the frame to be checked
1908 * @vid: the VLAN ID of the frame
1910 * batadv_bla_tx checks if:
1911 * * a claim was received which has to be processed
1912 * * the frame is allowed on the mesh
1914 * in these cases, the skb is further handled by this function.
1916 * This call might reallocate skb data.
1918 * Return: true if handled, otherwise it returns false and the caller shall
1919 * further process the skb.
1921 bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1924 struct ethhdr *ethhdr;
1925 struct batadv_bla_claim search_claim, *claim = NULL;
1926 struct batadv_bla_backbone_gw *backbone_gw;
1927 struct batadv_hard_iface *primary_if;
1931 primary_if = batadv_primary_if_get_selected(bat_priv);
1935 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1938 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1941 ethhdr = eth_hdr(skb);
1943 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1944 /* don't allow broadcasts while requests are in flight */
1945 if (is_multicast_ether_addr(ethhdr->h_dest))
1948 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1949 search_claim.vid = vid;
1951 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1953 /* if no claim exists, allow it. */
1957 /* check if we are responsible. */
1958 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1959 client_roamed = batadv_compare_eth(backbone_gw->orig,
1960 primary_if->net_dev->dev_addr);
1961 batadv_backbone_gw_put(backbone_gw);
1963 if (client_roamed) {
1964 /* if yes, the client has roamed and we have
1967 batadv_handle_unclaim(bat_priv, primary_if,
1968 primary_if->net_dev->dev_addr,
1969 ethhdr->h_source, vid);
1973 /* check if it is a multicast/broadcast frame */
1974 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1975 /* drop it. the responsible gateway has forwarded it into
1976 * the backbone network.
1980 /* we must allow it. at least if we are
1981 * responsible for the DESTINATION.
1986 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1993 batadv_hardif_put(primary_if);
1995 batadv_claim_put(claim);
1999 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2001 * batadv_bla_claim_table_seq_print_text - print the claim table in a seq file
2002 * @seq: seq file to print on
2007 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
2009 struct net_device *net_dev = (struct net_device *)seq->private;
2010 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2011 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
2012 struct batadv_bla_backbone_gw *backbone_gw;
2013 struct batadv_bla_claim *claim;
2014 struct batadv_hard_iface *primary_if;
2015 struct hlist_head *head;
2021 primary_if = batadv_seq_print_text_primary_if_get(seq);
2025 primary_addr = primary_if->net_dev->dev_addr;
2027 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
2028 net_dev->name, primary_addr,
2029 ntohs(bat_priv->bla.claim_dest.group));
2031 " Client VID Originator [o] (CRC )\n");
2032 for (i = 0; i < hash->size; i++) {
2033 head = &hash->table[i];
2036 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2037 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
2039 is_own = batadv_compare_eth(backbone_gw->orig,
2042 spin_lock_bh(&backbone_gw->crc_lock);
2043 backbone_crc = backbone_gw->crc;
2044 spin_unlock_bh(&backbone_gw->crc_lock);
2045 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
2046 claim->addr, BATADV_PRINT_VID(claim->vid),
2048 (is_own ? 'x' : ' '),
2051 batadv_backbone_gw_put(backbone_gw);
2057 batadv_hardif_put(primary_if);
2063 * batadv_bla_claim_dump_entry - dump one entry of the claim table
2064 * to a netlink socket
2065 * @msg: buffer for the message
2066 * @portid: netlink port
2067 * @seq: Sequence number of netlink message
2068 * @primary_if: primary interface
2069 * @claim: entry to dump
2071 * Return: 0 or error code.
2074 batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2075 struct batadv_hard_iface *primary_if,
2076 struct batadv_bla_claim *claim)
2078 u8 *primary_addr = primary_if->net_dev->dev_addr;
2084 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2085 NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
2091 is_own = batadv_compare_eth(claim->backbone_gw->orig,
2094 spin_lock_bh(&claim->backbone_gw->crc_lock);
2095 backbone_crc = claim->backbone_gw->crc;
2096 spin_unlock_bh(&claim->backbone_gw->crc_lock);
2099 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2100 genlmsg_cancel(msg, hdr);
2104 if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
2105 nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
2106 nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2107 claim->backbone_gw->orig) ||
2108 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2110 genlmsg_cancel(msg, hdr);
2114 genlmsg_end(msg, hdr);
2122 * batadv_bla_claim_dump_bucket - dump one bucket of the claim table
2123 * to a netlink socket
2124 * @msg: buffer for the message
2125 * @portid: netlink port
2126 * @seq: Sequence number of netlink message
2127 * @primary_if: primary interface
2128 * @head: bucket to dump
2129 * @idx_skip: How many entries to skip
2134 batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2135 struct batadv_hard_iface *primary_if,
2136 struct hlist_head *head, int *idx_skip)
2138 struct batadv_bla_claim *claim;
2142 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2143 if (idx++ < *idx_skip)
2145 if (batadv_bla_claim_dump_entry(msg, portid, seq,
2146 primary_if, claim)) {
2147 *idx_skip = idx - 1;
2159 * batadv_bla_claim_dump - dump claim table to a netlink socket
2160 * @msg: buffer for the message
2161 * @cb: callback structure containing arguments
2163 * Return: message length.
2165 int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
2167 struct batadv_hard_iface *primary_if = NULL;
2168 int portid = NETLINK_CB(cb->skb).portid;
2169 struct net *net = sock_net(cb->skb->sk);
2170 struct net_device *soft_iface;
2171 struct batadv_hashtable *hash;
2172 struct batadv_priv *bat_priv;
2173 int bucket = cb->args[0];
2174 struct hlist_head *head;
2175 int idx = cb->args[1];
2179 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2180 BATADV_ATTR_MESH_IFINDEX);
2184 soft_iface = dev_get_by_index(net, ifindex);
2185 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2190 bat_priv = netdev_priv(soft_iface);
2191 hash = bat_priv->bla.claim_hash;
2193 primary_if = batadv_primary_if_get_selected(bat_priv);
2194 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2199 while (bucket < hash->size) {
2200 head = &hash->table[bucket];
2202 if (batadv_bla_claim_dump_bucket(msg, portid,
2204 primary_if, head, &idx))
2209 cb->args[0] = bucket;
2216 batadv_hardif_put(primary_if);
2219 dev_put(soft_iface);
2224 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
2226 * batadv_bla_backbone_table_seq_print_text - print the backbone table in a seq
2228 * @seq: seq file to print on
2233 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
2235 struct net_device *net_dev = (struct net_device *)seq->private;
2236 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2237 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
2238 struct batadv_bla_backbone_gw *backbone_gw;
2239 struct batadv_hard_iface *primary_if;
2240 struct hlist_head *head;
2247 primary_if = batadv_seq_print_text_primary_if_get(seq);
2251 primary_addr = primary_if->net_dev->dev_addr;
2253 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
2254 net_dev->name, primary_addr,
2255 ntohs(bat_priv->bla.claim_dest.group));
2256 seq_puts(seq, " Originator VID last seen (CRC )\n");
2257 for (i = 0; i < hash->size; i++) {
2258 head = &hash->table[i];
2261 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2262 msecs = jiffies_to_msecs(jiffies -
2263 backbone_gw->lasttime);
2264 secs = msecs / 1000;
2265 msecs = msecs % 1000;
2267 is_own = batadv_compare_eth(backbone_gw->orig,
2272 spin_lock_bh(&backbone_gw->crc_lock);
2273 backbone_crc = backbone_gw->crc;
2274 spin_unlock_bh(&backbone_gw->crc_lock);
2276 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
2278 BATADV_PRINT_VID(backbone_gw->vid), secs,
2279 msecs, backbone_crc);
2285 batadv_hardif_put(primary_if);
2291 * batadv_bla_backbone_dump_entry - dump one entry of the backbone table
2292 * to a netlink socket
2293 * @msg: buffer for the message
2294 * @portid: netlink port
2295 * @seq: Sequence number of netlink message
2296 * @primary_if: primary interface
2297 * @backbone_gw: entry to dump
2299 * Return: 0 or error code.
2302 batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2303 struct batadv_hard_iface *primary_if,
2304 struct batadv_bla_backbone_gw *backbone_gw)
2306 u8 *primary_addr = primary_if->net_dev->dev_addr;
2313 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2314 NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
2320 is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
2322 spin_lock_bh(&backbone_gw->crc_lock);
2323 backbone_crc = backbone_gw->crc;
2324 spin_unlock_bh(&backbone_gw->crc_lock);
2326 msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
2329 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2330 genlmsg_cancel(msg, hdr);
2334 if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2335 backbone_gw->orig) ||
2336 nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
2337 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2339 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
2340 genlmsg_cancel(msg, hdr);
2344 genlmsg_end(msg, hdr);
2352 * batadv_bla_backbone_dump_bucket - dump one bucket of the backbone table
2353 * to a netlink socket
2354 * @msg: buffer for the message
2355 * @portid: netlink port
2356 * @seq: Sequence number of netlink message
2357 * @primary_if: primary interface
2358 * @head: bucket to dump
2359 * @idx_skip: How many entries to skip
2364 batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2365 struct batadv_hard_iface *primary_if,
2366 struct hlist_head *head, int *idx_skip)
2368 struct batadv_bla_backbone_gw *backbone_gw;
2372 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2373 if (idx++ < *idx_skip)
2375 if (batadv_bla_backbone_dump_entry(msg, portid, seq,
2376 primary_if, backbone_gw)) {
2377 *idx_skip = idx - 1;
2389 * batadv_bla_backbone_dump - dump backbone table to a netlink socket
2390 * @msg: buffer for the message
2391 * @cb: callback structure containing arguments
2393 * Return: message length.
2395 int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
2397 struct batadv_hard_iface *primary_if = NULL;
2398 int portid = NETLINK_CB(cb->skb).portid;
2399 struct net *net = sock_net(cb->skb->sk);
2400 struct net_device *soft_iface;
2401 struct batadv_hashtable *hash;
2402 struct batadv_priv *bat_priv;
2403 int bucket = cb->args[0];
2404 struct hlist_head *head;
2405 int idx = cb->args[1];
2409 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2410 BATADV_ATTR_MESH_IFINDEX);
2414 soft_iface = dev_get_by_index(net, ifindex);
2415 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2420 bat_priv = netdev_priv(soft_iface);
2421 hash = bat_priv->bla.backbone_hash;
2423 primary_if = batadv_primary_if_get_selected(bat_priv);
2424 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2429 while (bucket < hash->size) {
2430 head = &hash->table[bucket];
2432 if (batadv_bla_backbone_dump_bucket(msg, portid,
2434 primary_if, head, &idx))
2439 cb->args[0] = bucket;
2446 batadv_hardif_put(primary_if);
2449 dev_put(soft_iface);