1 /* Copyright (C) 2011-2012 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, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 #include "hard-interface.h"
23 #include "originator.h"
24 #include "bridge_loop_avoidance.h"
25 #include "translation-table.h"
28 #include <linux/etherdevice.h>
29 #include <linux/crc16.h>
30 #include <linux/if_arp.h>
32 #include <linux/if_vlan.h>
34 static const uint8_t batadv_announce_mac
[4] = {0x43, 0x05, 0x43, 0x05};
36 static void batadv_bla_periodic_work(struct work_struct
*work
);
37 static void batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
38 struct batadv_backbone_gw
*backbone_gw
);
40 /* return the index of the claim */
41 static inline uint32_t batadv_choose_claim(const void *data
, uint32_t size
)
43 const unsigned char *key
= data
;
47 for (i
= 0; i
< ETH_ALEN
+ sizeof(short); i
++) {
60 /* return the index of the backbone gateway */
61 static inline uint32_t batadv_choose_backbone_gw(const void *data
,
64 const unsigned char *key
= data
;
68 for (i
= 0; i
< ETH_ALEN
+ sizeof(short); i
++) {
82 /* compares address and vid of two backbone gws */
83 static int batadv_compare_backbone_gw(const struct hlist_node
*node
,
86 const void *data1
= container_of(node
, struct batadv_backbone_gw
,
89 return (memcmp(data1
, data2
, ETH_ALEN
+ sizeof(short)) == 0 ? 1 : 0);
92 /* compares address and vid of two claims */
93 static int batadv_compare_claim(const struct hlist_node
*node
,
96 const void *data1
= container_of(node
, struct batadv_claim
,
99 return (memcmp(data1
, data2
, ETH_ALEN
+ sizeof(short)) == 0 ? 1 : 0);
102 /* free a backbone gw */
103 static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw
*backbone_gw
)
105 if (atomic_dec_and_test(&backbone_gw
->refcount
))
106 kfree_rcu(backbone_gw
, rcu
);
109 /* finally deinitialize the claim */
110 static void batadv_claim_free_rcu(struct rcu_head
*rcu
)
112 struct batadv_claim
*claim
;
114 claim
= container_of(rcu
, struct batadv_claim
, rcu
);
116 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
120 /* free a claim, call claim_free_rcu if its the last reference */
121 static void batadv_claim_free_ref(struct batadv_claim
*claim
)
123 if (atomic_dec_and_test(&claim
->refcount
))
124 call_rcu(&claim
->rcu
, batadv_claim_free_rcu
);
127 /* @bat_priv: the bat priv with all the soft interface information
128 * @data: search data (may be local/static data)
130 * looks for a claim in the hash, and returns it if found
133 static struct batadv_claim
*batadv_claim_hash_find(struct batadv_priv
*bat_priv
,
134 struct batadv_claim
*data
)
136 struct batadv_hashtable
*hash
= bat_priv
->claim_hash
;
137 struct hlist_head
*head
;
138 struct hlist_node
*node
;
139 struct batadv_claim
*claim
;
140 struct batadv_claim
*claim_tmp
= NULL
;
146 index
= batadv_choose_claim(data
, hash
->size
);
147 head
= &hash
->table
[index
];
150 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
151 if (!batadv_compare_claim(&claim
->hash_entry
, data
))
154 if (!atomic_inc_not_zero(&claim
->refcount
))
166 * batadv_backbone_hash_find - looks for a claim in the hash
167 * @bat_priv: the bat priv with all the soft interface information
168 * @addr: the address of the originator
171 * Returns claim if found or NULL otherwise.
173 static struct batadv_backbone_gw
*
174 batadv_backbone_hash_find(struct batadv_priv
*bat_priv
,
175 uint8_t *addr
, short vid
)
177 struct batadv_hashtable
*hash
= bat_priv
->backbone_hash
;
178 struct hlist_head
*head
;
179 struct hlist_node
*node
;
180 struct batadv_backbone_gw search_entry
, *backbone_gw
;
181 struct batadv_backbone_gw
*backbone_gw_tmp
= NULL
;
187 memcpy(search_entry
.orig
, addr
, ETH_ALEN
);
188 search_entry
.vid
= vid
;
190 index
= batadv_choose_backbone_gw(&search_entry
, hash
->size
);
191 head
= &hash
->table
[index
];
194 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
195 if (!batadv_compare_backbone_gw(&backbone_gw
->hash_entry
,
199 if (!atomic_inc_not_zero(&backbone_gw
->refcount
))
202 backbone_gw_tmp
= backbone_gw
;
207 return backbone_gw_tmp
;
210 /* delete all claims for a backbone */
212 batadv_bla_del_backbone_claims(struct batadv_backbone_gw
*backbone_gw
)
214 struct batadv_hashtable
*hash
;
215 struct hlist_node
*node
, *node_tmp
;
216 struct hlist_head
*head
;
217 struct batadv_claim
*claim
;
219 spinlock_t
*list_lock
; /* protects write access to the hash lists */
221 hash
= backbone_gw
->bat_priv
->claim_hash
;
225 for (i
= 0; i
< hash
->size
; i
++) {
226 head
= &hash
->table
[i
];
227 list_lock
= &hash
->list_locks
[i
];
229 spin_lock_bh(list_lock
);
230 hlist_for_each_entry_safe(claim
, node
, node_tmp
,
233 if (claim
->backbone_gw
!= backbone_gw
)
236 batadv_claim_free_ref(claim
);
239 spin_unlock_bh(list_lock
);
242 /* all claims gone, intialize CRC */
243 backbone_gw
->crc
= BATADV_BLA_CRC_INIT
;
247 * batadv_bla_send_claim - sends a claim frame according to the provided info
248 * @bat_priv: the bat priv with all the soft interface information
249 * @orig: the mac address to be announced within the claim
251 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
253 static void batadv_bla_send_claim(struct batadv_priv
*bat_priv
, uint8_t *mac
,
254 short vid
, int claimtype
)
257 struct ethhdr
*ethhdr
;
258 struct batadv_hard_iface
*primary_if
;
259 struct net_device
*soft_iface
;
261 struct batadv_bla_claim_dst local_claim_dest
;
264 primary_if
= batadv_primary_if_get_selected(bat_priv
);
268 memcpy(&local_claim_dest
, &bat_priv
->claim_dest
,
269 sizeof(local_claim_dest
));
270 local_claim_dest
.type
= claimtype
;
272 soft_iface
= primary_if
->soft_iface
;
274 skb
= arp_create(ARPOP_REPLY
, ETH_P_ARP
,
275 /* IP DST: 0.0.0.0 */
277 primary_if
->soft_iface
,
278 /* IP SRC: 0.0.0.0 */
280 /* Ethernet DST: Broadcast */
282 /* Ethernet SRC/HW SRC: originator mac */
283 primary_if
->net_dev
->dev_addr
,
284 /* HW DST: FF:43:05:XX:00:00
285 * with XX = claim type
286 * and YY:YY = group id
288 (uint8_t *)&local_claim_dest
);
293 ethhdr
= (struct ethhdr
*)skb
->data
;
294 hw_src
= (uint8_t *)ethhdr
+ ETH_HLEN
+ sizeof(struct arphdr
);
296 /* now we pretend that the client would have sent this ... */
298 case BATADV_CLAIM_TYPE_ADD
:
299 /* normal claim frame
300 * set Ethernet SRC to the clients mac
302 memcpy(ethhdr
->h_source
, mac
, ETH_ALEN
);
303 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
304 "bla_send_claim(): CLAIM %pM on vid %d\n", mac
, vid
);
306 case BATADV_CLAIM_TYPE_DEL
:
308 * set HW SRC to the clients mac
310 memcpy(hw_src
, mac
, ETH_ALEN
);
311 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
312 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac
,
315 case BATADV_CLAIM_TYPE_ANNOUNCE
:
316 /* announcement frame
317 * set HW SRC to the special mac containg the crc
319 memcpy(hw_src
, mac
, ETH_ALEN
);
320 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
321 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
322 ethhdr
->h_source
, vid
);
324 case BATADV_CLAIM_TYPE_REQUEST
:
326 * set HW SRC to the special mac containg the crc
328 memcpy(hw_src
, mac
, ETH_ALEN
);
329 memcpy(ethhdr
->h_dest
, mac
, ETH_ALEN
);
330 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
331 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
332 ethhdr
->h_source
, ethhdr
->h_dest
, vid
);
338 skb
= vlan_insert_tag(skb
, vid
);
340 skb_reset_mac_header(skb
);
341 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
342 bat_priv
->stats
.rx_packets
++;
343 bat_priv
->stats
.rx_bytes
+= skb
->len
+ ETH_HLEN
;
344 soft_iface
->last_rx
= jiffies
;
349 batadv_hardif_free_ref(primary_if
);
353 * batadv_bla_get_backbone_gw
354 * @bat_priv: the bat priv with all the soft interface information
355 * @orig: the mac address of the originator
358 * searches for the backbone gw or creates a new one if it could not
361 static struct batadv_backbone_gw
*
362 batadv_bla_get_backbone_gw(struct batadv_priv
*bat_priv
, uint8_t *orig
,
365 struct batadv_backbone_gw
*entry
;
366 struct batadv_orig_node
*orig_node
;
369 entry
= batadv_backbone_hash_find(bat_priv
, orig
, vid
);
374 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
375 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
378 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
383 entry
->lasttime
= jiffies
;
384 entry
->crc
= BATADV_BLA_CRC_INIT
;
385 entry
->bat_priv
= bat_priv
;
386 atomic_set(&entry
->request_sent
, 0);
387 memcpy(entry
->orig
, orig
, ETH_ALEN
);
389 /* one for the hash, one for returning */
390 atomic_set(&entry
->refcount
, 2);
392 hash_added
= batadv_hash_add(bat_priv
->backbone_hash
,
393 batadv_compare_backbone_gw
,
394 batadv_choose_backbone_gw
, entry
,
397 if (unlikely(hash_added
!= 0)) {
398 /* hash failed, free the structure */
403 /* this is a gateway now, remove any tt entries */
404 orig_node
= batadv_orig_hash_find(bat_priv
, orig
);
406 batadv_tt_global_del_orig(bat_priv
, orig_node
,
407 "became a backbone gateway");
408 batadv_orig_node_free_ref(orig_node
);
413 /* update or add the own backbone gw to make sure we announce
414 * where we receive other backbone gws
417 batadv_bla_update_own_backbone_gw(struct batadv_priv
*bat_priv
,
418 struct batadv_hard_iface
*primary_if
,
421 struct batadv_backbone_gw
*backbone_gw
;
423 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
,
424 primary_if
->net_dev
->dev_addr
,
426 if (unlikely(!backbone_gw
))
429 backbone_gw
->lasttime
= jiffies
;
430 batadv_backbone_gw_free_ref(backbone_gw
);
433 /* @bat_priv: the bat priv with all the soft interface information
434 * @vid: the vid where the request came on
436 * Repeat all of our own claims, and finally send an ANNOUNCE frame
437 * to allow the requester another check if the CRC is correct now.
439 static void batadv_bla_answer_request(struct batadv_priv
*bat_priv
,
440 struct batadv_hard_iface
*primary_if
,
443 struct hlist_node
*node
;
444 struct hlist_head
*head
;
445 struct batadv_hashtable
*hash
;
446 struct batadv_claim
*claim
;
447 struct batadv_backbone_gw
*backbone_gw
;
450 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
451 "bla_answer_request(): received a claim request, send all of our own claims again\n");
453 backbone_gw
= batadv_backbone_hash_find(bat_priv
,
454 primary_if
->net_dev
->dev_addr
,
459 hash
= bat_priv
->claim_hash
;
460 for (i
= 0; i
< hash
->size
; i
++) {
461 head
= &hash
->table
[i
];
464 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
465 /* only own claims are interesting */
466 if (claim
->backbone_gw
!= backbone_gw
)
469 batadv_bla_send_claim(bat_priv
, claim
->addr
, claim
->vid
,
470 BATADV_CLAIM_TYPE_ADD
);
475 /* finally, send an announcement frame */
476 batadv_bla_send_announce(bat_priv
, backbone_gw
);
477 batadv_backbone_gw_free_ref(backbone_gw
);
480 /* @backbone_gw: the backbone gateway from whom we are out of sync
482 * When the crc is wrong, ask the backbone gateway for a full table update.
483 * After the request, it will repeat all of his own claims and finally
484 * send an announcement claim with which we can check again.
486 static void batadv_bla_send_request(struct batadv_backbone_gw
*backbone_gw
)
488 /* first, remove all old entries */
489 batadv_bla_del_backbone_claims(backbone_gw
);
491 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
492 "Sending REQUEST to %pM\n", backbone_gw
->orig
);
495 batadv_bla_send_claim(backbone_gw
->bat_priv
, backbone_gw
->orig
,
496 backbone_gw
->vid
, BATADV_CLAIM_TYPE_REQUEST
);
498 /* no local broadcasts should be sent or received, for now. */
499 if (!atomic_read(&backbone_gw
->request_sent
)) {
500 atomic_inc(&backbone_gw
->bat_priv
->bla_num_requests
);
501 atomic_set(&backbone_gw
->request_sent
, 1);
505 /* @bat_priv: the bat priv with all the soft interface information
506 * @backbone_gw: our backbone gateway which should be announced
508 * This function sends an announcement. It is called from multiple
511 static void batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
512 struct batadv_backbone_gw
*backbone_gw
)
514 uint8_t mac
[ETH_ALEN
];
517 memcpy(mac
, batadv_announce_mac
, 4);
518 crc
= htons(backbone_gw
->crc
);
519 memcpy(&mac
[4], &crc
, 2);
521 batadv_bla_send_claim(bat_priv
, mac
, backbone_gw
->vid
,
522 BATADV_CLAIM_TYPE_ANNOUNCE
);
527 * batadv_bla_add_claim - Adds a claim in the claim hash
528 * @bat_priv: the bat priv with all the soft interface information
529 * @mac: the mac address of the claim
530 * @vid: the VLAN ID of the frame
531 * @backbone_gw: the backbone gateway which claims it
533 static void batadv_bla_add_claim(struct batadv_priv
*bat_priv
,
534 const uint8_t *mac
, const short vid
,
535 struct batadv_backbone_gw
*backbone_gw
)
537 struct batadv_claim
*claim
;
538 struct batadv_claim search_claim
;
541 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
542 search_claim
.vid
= vid
;
543 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
545 /* create a new claim entry if it does not exist yet. */
547 claim
= kzalloc(sizeof(*claim
), GFP_ATOMIC
);
551 memcpy(claim
->addr
, mac
, ETH_ALEN
);
553 claim
->lasttime
= jiffies
;
554 claim
->backbone_gw
= backbone_gw
;
556 atomic_set(&claim
->refcount
, 2);
557 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
558 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
560 hash_added
= batadv_hash_add(bat_priv
->claim_hash
,
561 batadv_compare_claim
,
562 batadv_choose_claim
, claim
,
565 if (unlikely(hash_added
!= 0)) {
566 /* only local changes happened. */
571 claim
->lasttime
= jiffies
;
572 if (claim
->backbone_gw
== backbone_gw
)
573 /* no need to register a new backbone */
576 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
577 "bla_add_claim(): changing ownership for %pM, vid %d\n",
580 claim
->backbone_gw
->crc
^=
581 crc16(0, claim
->addr
, ETH_ALEN
);
582 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
585 /* set (new) backbone gw */
586 atomic_inc(&backbone_gw
->refcount
);
587 claim
->backbone_gw
= backbone_gw
;
589 backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
590 backbone_gw
->lasttime
= jiffies
;
593 batadv_claim_free_ref(claim
);
596 /* Delete a claim from the claim hash which has the
597 * given mac address and vid.
599 static void batadv_bla_del_claim(struct batadv_priv
*bat_priv
,
600 const uint8_t *mac
, const short vid
)
602 struct batadv_claim search_claim
, *claim
;
604 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
605 search_claim
.vid
= vid
;
606 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
610 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla_del_claim(): %pM, vid %d\n",
613 batadv_hash_remove(bat_priv
->claim_hash
, batadv_compare_claim
,
614 batadv_choose_claim
, claim
);
615 batadv_claim_free_ref(claim
); /* reference from the hash is gone */
617 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
619 /* don't need the reference from hash_find() anymore */
620 batadv_claim_free_ref(claim
);
623 /* check for ANNOUNCE frame, return 1 if handled */
624 static int batadv_handle_announce(struct batadv_priv
*bat_priv
,
625 uint8_t *an_addr
, uint8_t *backbone_addr
,
628 struct batadv_backbone_gw
*backbone_gw
;
631 if (memcmp(an_addr
, batadv_announce_mac
, 4) != 0)
634 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
);
636 if (unlikely(!backbone_gw
))
640 /* handle as ANNOUNCE frame */
641 backbone_gw
->lasttime
= jiffies
;
642 crc
= ntohs(*((__be16
*)(&an_addr
[4])));
644 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
645 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n",
646 vid
, backbone_gw
->orig
, crc
);
648 if (backbone_gw
->crc
!= crc
) {
649 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
650 "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n",
651 backbone_gw
->orig
, backbone_gw
->vid
,
652 backbone_gw
->crc
, crc
);
654 batadv_bla_send_request(backbone_gw
);
656 /* if we have sent a request and the crc was OK,
657 * we can allow traffic again.
659 if (atomic_read(&backbone_gw
->request_sent
)) {
660 atomic_dec(&backbone_gw
->bat_priv
->bla_num_requests
);
661 atomic_set(&backbone_gw
->request_sent
, 0);
665 batadv_backbone_gw_free_ref(backbone_gw
);
669 /* check for REQUEST frame, return 1 if handled */
670 static int batadv_handle_request(struct batadv_priv
*bat_priv
,
671 struct batadv_hard_iface
*primary_if
,
672 uint8_t *backbone_addr
,
673 struct ethhdr
*ethhdr
, short vid
)
675 /* check for REQUEST frame */
676 if (!batadv_compare_eth(backbone_addr
, ethhdr
->h_dest
))
679 /* sanity check, this should not happen on a normal switch,
680 * we ignore it in this case.
682 if (!batadv_compare_eth(ethhdr
->h_dest
, primary_if
->net_dev
->dev_addr
))
685 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
686 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
687 vid
, ethhdr
->h_source
);
689 batadv_bla_answer_request(bat_priv
, primary_if
, vid
);
693 /* check for UNCLAIM frame, return 1 if handled */
694 static int batadv_handle_unclaim(struct batadv_priv
*bat_priv
,
695 struct batadv_hard_iface
*primary_if
,
696 uint8_t *backbone_addr
,
697 uint8_t *claim_addr
, short vid
)
699 struct batadv_backbone_gw
*backbone_gw
;
701 /* unclaim in any case if it is our own */
702 if (primary_if
&& batadv_compare_eth(backbone_addr
,
703 primary_if
->net_dev
->dev_addr
))
704 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
705 BATADV_CLAIM_TYPE_DEL
);
707 backbone_gw
= batadv_backbone_hash_find(bat_priv
, backbone_addr
, vid
);
712 /* this must be an UNCLAIM frame */
713 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
714 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
715 claim_addr
, vid
, backbone_gw
->orig
);
717 batadv_bla_del_claim(bat_priv
, claim_addr
, vid
);
718 batadv_backbone_gw_free_ref(backbone_gw
);
722 /* check for CLAIM frame, return 1 if handled */
723 static int batadv_handle_claim(struct batadv_priv
*bat_priv
,
724 struct batadv_hard_iface
*primary_if
,
725 uint8_t *backbone_addr
, uint8_t *claim_addr
,
728 struct batadv_backbone_gw
*backbone_gw
;
730 /* register the gateway if not yet available, and add the claim. */
732 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
);
734 if (unlikely(!backbone_gw
))
737 /* this must be a CLAIM frame */
738 batadv_bla_add_claim(bat_priv
, claim_addr
, vid
, backbone_gw
);
739 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
740 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
741 BATADV_CLAIM_TYPE_ADD
);
743 /* TODO: we could call something like tt_local_del() here. */
745 batadv_backbone_gw_free_ref(backbone_gw
);
750 * batadv_check_claim_group
751 * @bat_priv: the bat priv with all the soft interface information
752 * @hw_src: the Hardware source in the ARP Header
753 * @hw_dst: the Hardware destination in the ARP Header
754 * @ethhdr: pointer to the Ethernet header of the claim frame
756 * checks if it is a claim packet and if its on the same group.
757 * This function also applies the group ID of the sender
758 * if it is in the same mesh.
761 * 2 - if it is a claim packet and on the same group
762 * 1 - if is a claim packet from another group
763 * 0 - if it is not a claim packet
765 static int batadv_check_claim_group(struct batadv_priv
*bat_priv
,
766 struct batadv_hard_iface
*primary_if
,
767 uint8_t *hw_src
, uint8_t *hw_dst
,
768 struct ethhdr
*ethhdr
)
770 uint8_t *backbone_addr
;
771 struct batadv_orig_node
*orig_node
;
772 struct batadv_bla_claim_dst
*bla_dst
, *bla_dst_own
;
774 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
775 bla_dst_own
= &bat_priv
->claim_dest
;
777 /* check if it is a claim packet in general */
778 if (memcmp(bla_dst
->magic
, bla_dst_own
->magic
,
779 sizeof(bla_dst
->magic
)) != 0)
782 /* if announcement packet, use the source,
783 * otherwise assume it is in the hw_src
785 switch (bla_dst
->type
) {
786 case BATADV_CLAIM_TYPE_ADD
:
787 backbone_addr
= hw_src
;
789 case BATADV_CLAIM_TYPE_REQUEST
:
790 case BATADV_CLAIM_TYPE_ANNOUNCE
:
791 case BATADV_CLAIM_TYPE_DEL
:
792 backbone_addr
= ethhdr
->h_source
;
798 /* don't accept claim frames from ourselves */
799 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
802 /* if its already the same group, it is fine. */
803 if (bla_dst
->group
== bla_dst_own
->group
)
806 /* lets see if this originator is in our mesh */
807 orig_node
= batadv_orig_hash_find(bat_priv
, backbone_addr
);
809 /* dont accept claims from gateways which are not in
810 * the same mesh or group.
815 /* if our mesh friends mac is bigger, use it for ourselves. */
816 if (ntohs(bla_dst
->group
) > ntohs(bla_dst_own
->group
)) {
817 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
818 "taking other backbones claim group: %04x\n",
819 ntohs(bla_dst
->group
));
820 bla_dst_own
->group
= bla_dst
->group
;
823 batadv_orig_node_free_ref(orig_node
);
829 /* @bat_priv: the bat priv with all the soft interface information
830 * @skb: the frame to be checked
832 * Check if this is a claim frame, and process it accordingly.
834 * returns 1 if it was a claim frame, otherwise return 0 to
835 * tell the callee that it can use the frame on its own.
837 static int batadv_bla_process_claim(struct batadv_priv
*bat_priv
,
838 struct batadv_hard_iface
*primary_if
,
841 struct ethhdr
*ethhdr
;
842 struct vlan_ethhdr
*vhdr
;
843 struct arphdr
*arphdr
;
844 uint8_t *hw_src
, *hw_dst
;
845 struct batadv_bla_claim_dst
*bla_dst
;
851 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
853 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
854 vhdr
= (struct vlan_ethhdr
*)ethhdr
;
855 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
856 proto
= ntohs(vhdr
->h_vlan_encapsulated_proto
);
857 headlen
= sizeof(*vhdr
);
859 proto
= ntohs(ethhdr
->h_proto
);
863 if (proto
!= ETH_P_ARP
)
864 return 0; /* not a claim frame */
866 /* this must be a ARP frame. check if it is a claim. */
868 if (unlikely(!pskb_may_pull(skb
, headlen
+ arp_hdr_len(skb
->dev
))))
871 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
872 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
873 arphdr
= (struct arphdr
*)((uint8_t *)ethhdr
+ headlen
);
875 /* Check whether the ARP frame carries a valid
878 if (arphdr
->ar_hrd
!= htons(ARPHRD_ETHER
))
880 if (arphdr
->ar_pro
!= htons(ETH_P_IP
))
882 if (arphdr
->ar_hln
!= ETH_ALEN
)
884 if (arphdr
->ar_pln
!= 4)
887 hw_src
= (uint8_t *)arphdr
+ sizeof(struct arphdr
);
888 hw_dst
= hw_src
+ ETH_ALEN
+ 4;
889 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
891 /* check if it is a claim frame. */
892 ret
= batadv_check_claim_group(bat_priv
, primary_if
, hw_src
, hw_dst
,
895 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
896 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
897 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
902 /* become a backbone gw ourselves on this vlan if not happened yet */
903 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
905 /* check for the different types of claim frames ... */
906 switch (bla_dst
->type
) {
907 case BATADV_CLAIM_TYPE_ADD
:
908 if (batadv_handle_claim(bat_priv
, primary_if
, hw_src
,
909 ethhdr
->h_source
, vid
))
912 case BATADV_CLAIM_TYPE_DEL
:
913 if (batadv_handle_unclaim(bat_priv
, primary_if
,
914 ethhdr
->h_source
, hw_src
, vid
))
918 case BATADV_CLAIM_TYPE_ANNOUNCE
:
919 if (batadv_handle_announce(bat_priv
, hw_src
, ethhdr
->h_source
,
923 case BATADV_CLAIM_TYPE_REQUEST
:
924 if (batadv_handle_request(bat_priv
, primary_if
, hw_src
, ethhdr
,
930 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
931 "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",
932 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
936 /* Check when we last heard from other nodes, and remove them in case of
937 * a time out, or clean all backbone gws if now is set.
939 static void batadv_bla_purge_backbone_gw(struct batadv_priv
*bat_priv
, int now
)
941 struct batadv_backbone_gw
*backbone_gw
;
942 struct hlist_node
*node
, *node_tmp
;
943 struct hlist_head
*head
;
944 struct batadv_hashtable
*hash
;
945 spinlock_t
*list_lock
; /* protects write access to the hash lists */
948 hash
= bat_priv
->backbone_hash
;
952 for (i
= 0; i
< hash
->size
; i
++) {
953 head
= &hash
->table
[i
];
954 list_lock
= &hash
->list_locks
[i
];
956 spin_lock_bh(list_lock
);
957 hlist_for_each_entry_safe(backbone_gw
, node
, node_tmp
,
961 if (!batadv_has_timed_out(backbone_gw
->lasttime
,
962 BATADV_BLA_BACKBONE_TIMEOUT
))
965 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
966 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
970 /* don't wait for the pending request anymore */
971 if (atomic_read(&backbone_gw
->request_sent
))
972 atomic_dec(&bat_priv
->bla_num_requests
);
974 batadv_bla_del_backbone_claims(backbone_gw
);
977 batadv_backbone_gw_free_ref(backbone_gw
);
979 spin_unlock_bh(list_lock
);
984 * batadv_bla_purge_claims
985 * @bat_priv: the bat priv with all the soft interface information
986 * @primary_if: the selected primary interface, may be NULL if now is set
987 * @now: whether the whole hash shall be wiped now
989 * Check when we heard last time from our own claims, and remove them in case of
990 * a time out, or clean all claims if now is set
992 static void batadv_bla_purge_claims(struct batadv_priv
*bat_priv
,
993 struct batadv_hard_iface
*primary_if
,
996 struct batadv_claim
*claim
;
997 struct hlist_node
*node
;
998 struct hlist_head
*head
;
999 struct batadv_hashtable
*hash
;
1002 hash
= bat_priv
->claim_hash
;
1006 for (i
= 0; i
< hash
->size
; i
++) {
1007 head
= &hash
->table
[i
];
1010 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1013 if (!batadv_compare_eth(claim
->backbone_gw
->orig
,
1014 primary_if
->net_dev
->dev_addr
))
1016 if (!batadv_has_timed_out(claim
->lasttime
,
1017 BATADV_BLA_CLAIM_TIMEOUT
))
1020 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1021 "bla_purge_claims(): %pM, vid %d, time out\n",
1022 claim
->addr
, claim
->vid
);
1025 batadv_handle_unclaim(bat_priv
, primary_if
,
1026 claim
->backbone_gw
->orig
,
1027 claim
->addr
, claim
->vid
);
1034 * batadv_bla_update_orig_address
1035 * @bat_priv: the bat priv with all the soft interface information
1036 * @primary_if: the new selected primary_if
1037 * @oldif: the old primary interface, may be NULL
1039 * Update the backbone gateways when the own orig address changes.
1041 void batadv_bla_update_orig_address(struct batadv_priv
*bat_priv
,
1042 struct batadv_hard_iface
*primary_if
,
1043 struct batadv_hard_iface
*oldif
)
1045 struct batadv_backbone_gw
*backbone_gw
;
1046 struct hlist_node
*node
;
1047 struct hlist_head
*head
;
1048 struct batadv_hashtable
*hash
;
1051 /* reset bridge loop avoidance group id */
1052 bat_priv
->claim_dest
.group
=
1053 htons(crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
));
1056 batadv_bla_purge_claims(bat_priv
, NULL
, 1);
1057 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1061 hash
= bat_priv
->backbone_hash
;
1065 for (i
= 0; i
< hash
->size
; i
++) {
1066 head
= &hash
->table
[i
];
1069 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1070 /* own orig still holds the old value. */
1071 if (!batadv_compare_eth(backbone_gw
->orig
,
1072 oldif
->net_dev
->dev_addr
))
1075 memcpy(backbone_gw
->orig
,
1076 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1077 /* send an announce frame so others will ask for our
1078 * claims and update their tables.
1080 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1088 /* (re)start the timer */
1089 static void batadv_bla_start_timer(struct batadv_priv
*bat_priv
)
1091 INIT_DELAYED_WORK(&bat_priv
->bla_work
, batadv_bla_periodic_work
);
1092 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla_work
,
1093 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1096 /* periodic work to do:
1097 * * purge structures when they are too old
1098 * * send announcements
1100 static void batadv_bla_periodic_work(struct work_struct
*work
)
1102 struct delayed_work
*delayed_work
=
1103 container_of(work
, struct delayed_work
, work
);
1104 struct batadv_priv
*bat_priv
;
1105 struct hlist_node
*node
;
1106 struct hlist_head
*head
;
1107 struct batadv_backbone_gw
*backbone_gw
;
1108 struct batadv_hashtable
*hash
;
1109 struct batadv_hard_iface
*primary_if
;
1112 bat_priv
= container_of(delayed_work
, struct batadv_priv
, bla_work
);
1113 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1117 batadv_bla_purge_claims(bat_priv
, primary_if
, 0);
1118 batadv_bla_purge_backbone_gw(bat_priv
, 0);
1120 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1123 hash
= bat_priv
->backbone_hash
;
1127 for (i
= 0; i
< hash
->size
; i
++) {
1128 head
= &hash
->table
[i
];
1131 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1132 if (!batadv_compare_eth(backbone_gw
->orig
,
1133 primary_if
->net_dev
->dev_addr
))
1136 backbone_gw
->lasttime
= jiffies
;
1138 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1144 batadv_hardif_free_ref(primary_if
);
1146 batadv_bla_start_timer(bat_priv
);
1149 /* The hash for claim and backbone hash receive the same key because they
1150 * are getting initialized by hash_new with the same key. Reinitializing
1151 * them with to different keys to allow nested locking without generating
1154 static struct lock_class_key batadv_claim_hash_lock_class_key
;
1155 static struct lock_class_key batadv_backbone_hash_lock_class_key
;
1157 /* initialize all bla structures */
1158 int batadv_bla_init(struct batadv_priv
*bat_priv
)
1161 uint8_t claim_dest
[ETH_ALEN
] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1162 struct batadv_hard_iface
*primary_if
;
1164 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hash registering\n");
1166 /* setting claim destination address */
1167 memcpy(&bat_priv
->claim_dest
.magic
, claim_dest
, 3);
1168 bat_priv
->claim_dest
.type
= 0;
1169 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1171 bat_priv
->claim_dest
.group
=
1172 htons(crc16(0, primary_if
->net_dev
->dev_addr
,
1174 batadv_hardif_free_ref(primary_if
);
1176 bat_priv
->claim_dest
.group
= 0; /* will be set later */
1179 /* initialize the duplicate list */
1180 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++)
1181 bat_priv
->bcast_duplist
[i
].entrytime
=
1182 jiffies
- msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT
);
1183 bat_priv
->bcast_duplist_curr
= 0;
1185 if (bat_priv
->claim_hash
)
1188 bat_priv
->claim_hash
= batadv_hash_new(128);
1189 bat_priv
->backbone_hash
= batadv_hash_new(32);
1191 if (!bat_priv
->claim_hash
|| !bat_priv
->backbone_hash
)
1194 batadv_hash_set_lock_class(bat_priv
->claim_hash
,
1195 &batadv_claim_hash_lock_class_key
);
1196 batadv_hash_set_lock_class(bat_priv
->backbone_hash
,
1197 &batadv_backbone_hash_lock_class_key
);
1199 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hashes initialized\n");
1201 batadv_bla_start_timer(bat_priv
);
1206 * batadv_bla_check_bcast_duplist
1207 * @bat_priv: the bat priv with all the soft interface information
1208 * @bcast_packet: originator mac address
1209 * @hdr_size: maximum length of the frame
1211 * check if it is on our broadcast list. Another gateway might
1212 * have sent the same packet because it is connected to the same backbone,
1213 * so we have to remove this duplicate.
1215 * This is performed by checking the CRC, which will tell us
1216 * with a good chance that it is the same packet. If it is furthermore
1217 * sent by another host, drop it. We allow equal packets from
1218 * the same host however as this might be intended.
1220 int batadv_bla_check_bcast_duplist(struct batadv_priv
*bat_priv
,
1221 struct batadv_bcast_packet
*bcast_packet
,
1224 int i
, length
, curr
;
1227 struct batadv_bcast_duplist_entry
*entry
;
1229 length
= hdr_size
- sizeof(*bcast_packet
);
1230 content
= (uint8_t *)bcast_packet
;
1231 content
+= sizeof(*bcast_packet
);
1233 /* calculate the crc ... */
1234 crc
= crc16(0, content
, length
);
1236 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++) {
1237 curr
= (bat_priv
->bcast_duplist_curr
+ i
) % BATADV_DUPLIST_SIZE
;
1238 entry
= &bat_priv
->bcast_duplist
[curr
];
1240 /* we can stop searching if the entry is too old ;
1241 * later entries will be even older
1243 if (batadv_has_timed_out(entry
->entrytime
,
1244 BATADV_DUPLIST_TIMEOUT
))
1247 if (entry
->crc
!= crc
)
1250 if (batadv_compare_eth(entry
->orig
, bcast_packet
->orig
))
1253 /* this entry seems to match: same crc, not too old,
1254 * and from another gw. therefore return 1 to forbid it.
1258 /* not found, add a new entry (overwrite the oldest entry) */
1259 curr
= (bat_priv
->bcast_duplist_curr
+ BATADV_DUPLIST_SIZE
- 1);
1260 curr
%= BATADV_DUPLIST_SIZE
;
1261 entry
= &bat_priv
->bcast_duplist
[curr
];
1263 entry
->entrytime
= jiffies
;
1264 memcpy(entry
->orig
, bcast_packet
->orig
, ETH_ALEN
);
1265 bat_priv
->bcast_duplist_curr
= curr
;
1267 /* allow it, its the first occurence. */
1273 /* @bat_priv: the bat priv with all the soft interface information
1274 * @orig: originator mac address
1276 * check if the originator is a gateway for any VLAN ID.
1278 * returns 1 if it is found, 0 otherwise
1280 int batadv_bla_is_backbone_gw_orig(struct batadv_priv
*bat_priv
, uint8_t *orig
)
1282 struct batadv_hashtable
*hash
= bat_priv
->backbone_hash
;
1283 struct hlist_head
*head
;
1284 struct hlist_node
*node
;
1285 struct batadv_backbone_gw
*backbone_gw
;
1288 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1294 for (i
= 0; i
< hash
->size
; i
++) {
1295 head
= &hash
->table
[i
];
1298 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1299 if (batadv_compare_eth(backbone_gw
->orig
, orig
)) {
1312 * batadv_bla_is_backbone_gw
1313 * @skb: the frame to be checked
1314 * @orig_node: the orig_node of the frame
1315 * @hdr_size: maximum length of the frame
1317 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1318 * if the orig_node is also a gateway on the soft interface, otherwise it
1321 int batadv_bla_is_backbone_gw(struct sk_buff
*skb
,
1322 struct batadv_orig_node
*orig_node
, int hdr_size
)
1324 struct ethhdr
*ethhdr
;
1325 struct vlan_ethhdr
*vhdr
;
1326 struct batadv_backbone_gw
*backbone_gw
;
1329 if (!atomic_read(&orig_node
->bat_priv
->bridge_loop_avoidance
))
1332 /* first, find out the vid. */
1333 if (!pskb_may_pull(skb
, hdr_size
+ ETH_HLEN
))
1336 ethhdr
= (struct ethhdr
*)(((uint8_t *)skb
->data
) + hdr_size
);
1338 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
1339 if (!pskb_may_pull(skb
, hdr_size
+ sizeof(struct vlan_ethhdr
)))
1342 vhdr
= (struct vlan_ethhdr
*)(((uint8_t *)skb
->data
) +
1344 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1347 /* see if this originator is a backbone gw for this VLAN */
1348 backbone_gw
= batadv_backbone_hash_find(orig_node
->bat_priv
,
1349 orig_node
->orig
, vid
);
1353 batadv_backbone_gw_free_ref(backbone_gw
);
1357 /* free all bla structures (for softinterface free or module unload) */
1358 void batadv_bla_free(struct batadv_priv
*bat_priv
)
1360 struct batadv_hard_iface
*primary_if
;
1362 cancel_delayed_work_sync(&bat_priv
->bla_work
);
1363 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1365 if (bat_priv
->claim_hash
) {
1366 batadv_bla_purge_claims(bat_priv
, primary_if
, 1);
1367 batadv_hash_destroy(bat_priv
->claim_hash
);
1368 bat_priv
->claim_hash
= NULL
;
1370 if (bat_priv
->backbone_hash
) {
1371 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1372 batadv_hash_destroy(bat_priv
->backbone_hash
);
1373 bat_priv
->backbone_hash
= NULL
;
1376 batadv_hardif_free_ref(primary_if
);
1381 * @bat_priv: the bat priv with all the soft interface information
1382 * @skb: the frame to be checked
1383 * @vid: the VLAN ID of the frame
1384 * @is_bcast: the packet came in a broadcast packet type.
1386 * bla_rx avoidance checks if:
1387 * * we have to race for a claim
1388 * * if the frame is allowed on the LAN
1390 * in these cases, the skb is further handled by this function and
1391 * returns 1, otherwise it returns 0 and the caller shall further
1394 int batadv_bla_rx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
,
1397 struct ethhdr
*ethhdr
;
1398 struct batadv_claim search_claim
, *claim
= NULL
;
1399 struct batadv_hard_iface
*primary_if
;
1402 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1404 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1408 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1412 if (unlikely(atomic_read(&bat_priv
->bla_num_requests
)))
1413 /* don't allow broadcasts while requests are in flight */
1414 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
)
1417 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1418 search_claim
.vid
= vid
;
1419 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1422 /* possible optimization: race for a claim */
1423 /* No claim exists yet, claim it for us!
1425 batadv_handle_claim(bat_priv
, primary_if
,
1426 primary_if
->net_dev
->dev_addr
,
1427 ethhdr
->h_source
, vid
);
1431 /* if it is our own claim ... */
1432 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1433 primary_if
->net_dev
->dev_addr
)) {
1434 /* ... allow it in any case */
1435 claim
->lasttime
= jiffies
;
1439 /* if it is a broadcast ... */
1440 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
) {
1441 /* ... drop it. the responsible gateway is in charge.
1443 * We need to check is_bcast because with the gateway
1444 * feature, broadcasts (like DHCP requests) may be sent
1445 * using a unicast packet type.
1449 /* seems the client considers us as its best gateway.
1450 * send a claim and update the claim table
1453 batadv_handle_claim(bat_priv
, primary_if
,
1454 primary_if
->net_dev
->dev_addr
,
1455 ethhdr
->h_source
, vid
);
1459 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1469 batadv_hardif_free_ref(primary_if
);
1471 batadv_claim_free_ref(claim
);
1477 * @bat_priv: the bat priv with all the soft interface information
1478 * @skb: the frame to be checked
1479 * @vid: the VLAN ID of the frame
1482 * * a claim was received which has to be processed
1483 * * the frame is allowed on the mesh
1485 * in these cases, the skb is further handled by this function and
1486 * returns 1, otherwise it returns 0 and the caller shall further
1489 int batadv_bla_tx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
)
1491 struct ethhdr
*ethhdr
;
1492 struct batadv_claim search_claim
, *claim
= NULL
;
1493 struct batadv_hard_iface
*primary_if
;
1496 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1500 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1503 /* in VLAN case, the mac header might not be set. */
1504 skb_reset_mac_header(skb
);
1506 if (batadv_bla_process_claim(bat_priv
, primary_if
, skb
))
1509 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1511 if (unlikely(atomic_read(&bat_priv
->bla_num_requests
)))
1512 /* don't allow broadcasts while requests are in flight */
1513 if (is_multicast_ether_addr(ethhdr
->h_dest
))
1516 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1517 search_claim
.vid
= vid
;
1519 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1521 /* if no claim exists, allow it. */
1525 /* check if we are responsible. */
1526 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1527 primary_if
->net_dev
->dev_addr
)) {
1528 /* if yes, the client has roamed and we have
1531 batadv_handle_unclaim(bat_priv
, primary_if
,
1532 primary_if
->net_dev
->dev_addr
,
1533 ethhdr
->h_source
, vid
);
1537 /* check if it is a multicast/broadcast frame */
1538 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
1539 /* drop it. the responsible gateway has forwarded it into
1540 * the backbone network.
1544 /* we must allow it. at least if we are
1545 * responsible for the DESTINATION.
1550 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1557 batadv_hardif_free_ref(primary_if
);
1559 batadv_claim_free_ref(claim
);
1563 int batadv_bla_claim_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1565 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1566 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1567 struct batadv_hashtable
*hash
= bat_priv
->claim_hash
;
1568 struct batadv_claim
*claim
;
1569 struct batadv_hard_iface
*primary_if
;
1570 struct hlist_node
*node
;
1571 struct hlist_head
*head
;
1575 uint8_t *primary_addr
;
1577 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1579 ret
= seq_printf(seq
,
1580 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1585 if (primary_if
->if_status
!= BATADV_IF_ACTIVE
) {
1586 ret
= seq_printf(seq
,
1587 "BATMAN mesh %s disabled - primary interface not active\n",
1592 primary_addr
= primary_if
->net_dev
->dev_addr
;
1594 "Claims announced for the mesh %s (orig %pM, group id %04x)\n",
1595 net_dev
->name
, primary_addr
,
1596 ntohs(bat_priv
->claim_dest
.group
));
1597 seq_printf(seq
, " %-17s %-5s %-17s [o] (%-4s)\n",
1598 "Client", "VID", "Originator", "CRC");
1599 for (i
= 0; i
< hash
->size
; i
++) {
1600 head
= &hash
->table
[i
];
1603 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1604 is_own
= batadv_compare_eth(claim
->backbone_gw
->orig
,
1606 seq_printf(seq
, " * %pM on % 5d by %pM [%c] (%04x)\n",
1607 claim
->addr
, claim
->vid
,
1608 claim
->backbone_gw
->orig
,
1609 (is_own
? 'x' : ' '),
1610 claim
->backbone_gw
->crc
);
1616 batadv_hardif_free_ref(primary_if
);