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
->bla
.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
->bla
.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
->bla
.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
->bla
.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:YY:YY
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_CLAIM
:
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_UNCLAIM
:
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 and header destination to the receiving backbone
329 memcpy(hw_src
, mac
, ETH_ALEN
);
330 memcpy(ethhdr
->h_dest
, mac
, ETH_ALEN
);
331 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
332 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
333 ethhdr
->h_source
, ethhdr
->h_dest
, vid
);
339 skb
= vlan_insert_tag(skb
, vid
);
341 skb_reset_mac_header(skb
);
342 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
343 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
344 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
345 skb
->len
+ ETH_HLEN
);
346 soft_iface
->last_rx
= jiffies
;
351 batadv_hardif_free_ref(primary_if
);
355 * batadv_bla_get_backbone_gw
356 * @bat_priv: the bat priv with all the soft interface information
357 * @orig: the mac address of the originator
360 * searches for the backbone gw or creates a new one if it could not
363 static struct batadv_backbone_gw
*
364 batadv_bla_get_backbone_gw(struct batadv_priv
*bat_priv
, uint8_t *orig
,
367 struct batadv_backbone_gw
*entry
;
368 struct batadv_orig_node
*orig_node
;
371 entry
= batadv_backbone_hash_find(bat_priv
, orig
, vid
);
376 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
377 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
380 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
385 entry
->lasttime
= jiffies
;
386 entry
->crc
= BATADV_BLA_CRC_INIT
;
387 entry
->bat_priv
= bat_priv
;
388 atomic_set(&entry
->request_sent
, 0);
389 memcpy(entry
->orig
, orig
, ETH_ALEN
);
391 /* one for the hash, one for returning */
392 atomic_set(&entry
->refcount
, 2);
394 hash_added
= batadv_hash_add(bat_priv
->bla
.backbone_hash
,
395 batadv_compare_backbone_gw
,
396 batadv_choose_backbone_gw
, entry
,
399 if (unlikely(hash_added
!= 0)) {
400 /* hash failed, free the structure */
405 /* this is a gateway now, remove any tt entries */
406 orig_node
= batadv_orig_hash_find(bat_priv
, orig
);
408 batadv_tt_global_del_orig(bat_priv
, orig_node
,
409 "became a backbone gateway");
410 batadv_orig_node_free_ref(orig_node
);
415 /* update or add the own backbone gw to make sure we announce
416 * where we receive other backbone gws
419 batadv_bla_update_own_backbone_gw(struct batadv_priv
*bat_priv
,
420 struct batadv_hard_iface
*primary_if
,
423 struct batadv_backbone_gw
*backbone_gw
;
425 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
,
426 primary_if
->net_dev
->dev_addr
,
428 if (unlikely(!backbone_gw
))
431 backbone_gw
->lasttime
= jiffies
;
432 batadv_backbone_gw_free_ref(backbone_gw
);
435 /* @bat_priv: the bat priv with all the soft interface information
436 * @vid: the vid where the request came on
438 * Repeat all of our own claims, and finally send an ANNOUNCE frame
439 * to allow the requester another check if the CRC is correct now.
441 static void batadv_bla_answer_request(struct batadv_priv
*bat_priv
,
442 struct batadv_hard_iface
*primary_if
,
445 struct hlist_node
*node
;
446 struct hlist_head
*head
;
447 struct batadv_hashtable
*hash
;
448 struct batadv_claim
*claim
;
449 struct batadv_backbone_gw
*backbone_gw
;
452 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
453 "bla_answer_request(): received a claim request, send all of our own claims again\n");
455 backbone_gw
= batadv_backbone_hash_find(bat_priv
,
456 primary_if
->net_dev
->dev_addr
,
461 hash
= bat_priv
->bla
.claim_hash
;
462 for (i
= 0; i
< hash
->size
; i
++) {
463 head
= &hash
->table
[i
];
466 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
467 /* only own claims are interesting */
468 if (claim
->backbone_gw
!= backbone_gw
)
471 batadv_bla_send_claim(bat_priv
, claim
->addr
, claim
->vid
,
472 BATADV_CLAIM_TYPE_CLAIM
);
477 /* finally, send an announcement frame */
478 batadv_bla_send_announce(bat_priv
, backbone_gw
);
479 batadv_backbone_gw_free_ref(backbone_gw
);
482 /* @backbone_gw: the backbone gateway from whom we are out of sync
484 * When the crc is wrong, ask the backbone gateway for a full table update.
485 * After the request, it will repeat all of his own claims and finally
486 * send an announcement claim with which we can check again.
488 static void batadv_bla_send_request(struct batadv_backbone_gw
*backbone_gw
)
490 /* first, remove all old entries */
491 batadv_bla_del_backbone_claims(backbone_gw
);
493 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
494 "Sending REQUEST to %pM\n", backbone_gw
->orig
);
497 batadv_bla_send_claim(backbone_gw
->bat_priv
, backbone_gw
->orig
,
498 backbone_gw
->vid
, BATADV_CLAIM_TYPE_REQUEST
);
500 /* no local broadcasts should be sent or received, for now. */
501 if (!atomic_read(&backbone_gw
->request_sent
)) {
502 atomic_inc(&backbone_gw
->bat_priv
->bla
.num_requests
);
503 atomic_set(&backbone_gw
->request_sent
, 1);
507 /* @bat_priv: the bat priv with all the soft interface information
508 * @backbone_gw: our backbone gateway which should be announced
510 * This function sends an announcement. It is called from multiple
513 static void batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
514 struct batadv_backbone_gw
*backbone_gw
)
516 uint8_t mac
[ETH_ALEN
];
519 memcpy(mac
, batadv_announce_mac
, 4);
520 crc
= htons(backbone_gw
->crc
);
521 memcpy(&mac
[4], &crc
, 2);
523 batadv_bla_send_claim(bat_priv
, mac
, backbone_gw
->vid
,
524 BATADV_CLAIM_TYPE_ANNOUNCE
);
529 * batadv_bla_add_claim - Adds a claim in the claim hash
530 * @bat_priv: the bat priv with all the soft interface information
531 * @mac: the mac address of the claim
532 * @vid: the VLAN ID of the frame
533 * @backbone_gw: the backbone gateway which claims it
535 static void batadv_bla_add_claim(struct batadv_priv
*bat_priv
,
536 const uint8_t *mac
, const short vid
,
537 struct batadv_backbone_gw
*backbone_gw
)
539 struct batadv_claim
*claim
;
540 struct batadv_claim search_claim
;
543 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
544 search_claim
.vid
= vid
;
545 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
547 /* create a new claim entry if it does not exist yet. */
549 claim
= kzalloc(sizeof(*claim
), GFP_ATOMIC
);
553 memcpy(claim
->addr
, mac
, ETH_ALEN
);
555 claim
->lasttime
= jiffies
;
556 claim
->backbone_gw
= backbone_gw
;
558 atomic_set(&claim
->refcount
, 2);
559 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
560 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
562 hash_added
= batadv_hash_add(bat_priv
->bla
.claim_hash
,
563 batadv_compare_claim
,
564 batadv_choose_claim
, claim
,
567 if (unlikely(hash_added
!= 0)) {
568 /* only local changes happened. */
573 claim
->lasttime
= jiffies
;
574 if (claim
->backbone_gw
== backbone_gw
)
575 /* no need to register a new backbone */
578 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
579 "bla_add_claim(): changing ownership for %pM, vid %d\n",
582 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
583 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
586 /* set (new) backbone gw */
587 atomic_inc(&backbone_gw
->refcount
);
588 claim
->backbone_gw
= backbone_gw
;
590 backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
591 backbone_gw
->lasttime
= jiffies
;
594 batadv_claim_free_ref(claim
);
597 /* Delete a claim from the claim hash which has the
598 * given mac address and vid.
600 static void batadv_bla_del_claim(struct batadv_priv
*bat_priv
,
601 const uint8_t *mac
, const short vid
)
603 struct batadv_claim search_claim
, *claim
;
605 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
606 search_claim
.vid
= vid
;
607 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
611 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla_del_claim(): %pM, vid %d\n",
614 batadv_hash_remove(bat_priv
->bla
.claim_hash
, batadv_compare_claim
,
615 batadv_choose_claim
, claim
);
616 batadv_claim_free_ref(claim
); /* reference from the hash is gone */
618 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
620 /* don't need the reference from hash_find() anymore */
621 batadv_claim_free_ref(claim
);
624 /* check for ANNOUNCE frame, return 1 if handled */
625 static int batadv_handle_announce(struct batadv_priv
*bat_priv
,
626 uint8_t *an_addr
, uint8_t *backbone_addr
,
629 struct batadv_backbone_gw
*backbone_gw
;
632 if (memcmp(an_addr
, batadv_announce_mac
, 4) != 0)
635 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
);
637 if (unlikely(!backbone_gw
))
641 /* handle as ANNOUNCE frame */
642 backbone_gw
->lasttime
= jiffies
;
643 crc
= ntohs(*((__be16
*)(&an_addr
[4])));
645 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
646 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %04x\n",
647 vid
, backbone_gw
->orig
, crc
);
649 if (backbone_gw
->crc
!= crc
) {
650 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
651 "handle_announce(): CRC FAILED for %pM/%d (my = %04x, sent = %04x)\n",
652 backbone_gw
->orig
, backbone_gw
->vid
,
653 backbone_gw
->crc
, crc
);
655 batadv_bla_send_request(backbone_gw
);
657 /* if we have sent a request and the crc was OK,
658 * we can allow traffic again.
660 if (atomic_read(&backbone_gw
->request_sent
)) {
661 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
662 atomic_set(&backbone_gw
->request_sent
, 0);
666 batadv_backbone_gw_free_ref(backbone_gw
);
670 /* check for REQUEST frame, return 1 if handled */
671 static int batadv_handle_request(struct batadv_priv
*bat_priv
,
672 struct batadv_hard_iface
*primary_if
,
673 uint8_t *backbone_addr
,
674 struct ethhdr
*ethhdr
, short vid
)
676 /* check for REQUEST frame */
677 if (!batadv_compare_eth(backbone_addr
, ethhdr
->h_dest
))
680 /* sanity check, this should not happen on a normal switch,
681 * we ignore it in this case.
683 if (!batadv_compare_eth(ethhdr
->h_dest
, primary_if
->net_dev
->dev_addr
))
686 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
687 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
688 vid
, ethhdr
->h_source
);
690 batadv_bla_answer_request(bat_priv
, primary_if
, vid
);
694 /* check for UNCLAIM frame, return 1 if handled */
695 static int batadv_handle_unclaim(struct batadv_priv
*bat_priv
,
696 struct batadv_hard_iface
*primary_if
,
697 uint8_t *backbone_addr
,
698 uint8_t *claim_addr
, short vid
)
700 struct batadv_backbone_gw
*backbone_gw
;
702 /* unclaim in any case if it is our own */
703 if (primary_if
&& batadv_compare_eth(backbone_addr
,
704 primary_if
->net_dev
->dev_addr
))
705 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
706 BATADV_CLAIM_TYPE_UNCLAIM
);
708 backbone_gw
= batadv_backbone_hash_find(bat_priv
, backbone_addr
, vid
);
713 /* this must be an UNCLAIM frame */
714 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
715 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
716 claim_addr
, vid
, backbone_gw
->orig
);
718 batadv_bla_del_claim(bat_priv
, claim_addr
, vid
);
719 batadv_backbone_gw_free_ref(backbone_gw
);
723 /* check for CLAIM frame, return 1 if handled */
724 static int batadv_handle_claim(struct batadv_priv
*bat_priv
,
725 struct batadv_hard_iface
*primary_if
,
726 uint8_t *backbone_addr
, uint8_t *claim_addr
,
729 struct batadv_backbone_gw
*backbone_gw
;
731 /* register the gateway if not yet available, and add the claim. */
733 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
);
735 if (unlikely(!backbone_gw
))
738 /* this must be a CLAIM frame */
739 batadv_bla_add_claim(bat_priv
, claim_addr
, vid
, backbone_gw
);
740 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
741 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
742 BATADV_CLAIM_TYPE_CLAIM
);
744 /* TODO: we could call something like tt_local_del() here. */
746 batadv_backbone_gw_free_ref(backbone_gw
);
751 * batadv_check_claim_group
752 * @bat_priv: the bat priv with all the soft interface information
753 * @hw_src: the Hardware source in the ARP Header
754 * @hw_dst: the Hardware destination in the ARP Header
755 * @ethhdr: pointer to the Ethernet header of the claim frame
757 * checks if it is a claim packet and if its on the same group.
758 * This function also applies the group ID of the sender
759 * if it is in the same mesh.
762 * 2 - if it is a claim packet and on the same group
763 * 1 - if is a claim packet from another group
764 * 0 - if it is not a claim packet
766 static int batadv_check_claim_group(struct batadv_priv
*bat_priv
,
767 struct batadv_hard_iface
*primary_if
,
768 uint8_t *hw_src
, uint8_t *hw_dst
,
769 struct ethhdr
*ethhdr
)
771 uint8_t *backbone_addr
;
772 struct batadv_orig_node
*orig_node
;
773 struct batadv_bla_claim_dst
*bla_dst
, *bla_dst_own
;
775 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
776 bla_dst_own
= &bat_priv
->bla
.claim_dest
;
778 /* check if it is a claim packet in general */
779 if (memcmp(bla_dst
->magic
, bla_dst_own
->magic
,
780 sizeof(bla_dst
->magic
)) != 0)
783 /* if announcement packet, use the source,
784 * otherwise assume it is in the hw_src
786 switch (bla_dst
->type
) {
787 case BATADV_CLAIM_TYPE_CLAIM
:
788 backbone_addr
= hw_src
;
790 case BATADV_CLAIM_TYPE_REQUEST
:
791 case BATADV_CLAIM_TYPE_ANNOUNCE
:
792 case BATADV_CLAIM_TYPE_UNCLAIM
:
793 backbone_addr
= ethhdr
->h_source
;
799 /* don't accept claim frames from ourselves */
800 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
803 /* if its already the same group, it is fine. */
804 if (bla_dst
->group
== bla_dst_own
->group
)
807 /* lets see if this originator is in our mesh */
808 orig_node
= batadv_orig_hash_find(bat_priv
, backbone_addr
);
810 /* dont accept claims from gateways which are not in
811 * the same mesh or group.
816 /* if our mesh friends mac is bigger, use it for ourselves. */
817 if (ntohs(bla_dst
->group
) > ntohs(bla_dst_own
->group
)) {
818 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
819 "taking other backbones claim group: %04x\n",
820 ntohs(bla_dst
->group
));
821 bla_dst_own
->group
= bla_dst
->group
;
824 batadv_orig_node_free_ref(orig_node
);
830 /* @bat_priv: the bat priv with all the soft interface information
831 * @skb: the frame to be checked
833 * Check if this is a claim frame, and process it accordingly.
835 * returns 1 if it was a claim frame, otherwise return 0 to
836 * tell the callee that it can use the frame on its own.
838 static int batadv_bla_process_claim(struct batadv_priv
*bat_priv
,
839 struct batadv_hard_iface
*primary_if
,
842 struct ethhdr
*ethhdr
;
843 struct vlan_ethhdr
*vhdr
;
844 struct arphdr
*arphdr
;
845 uint8_t *hw_src
, *hw_dst
;
846 struct batadv_bla_claim_dst
*bla_dst
;
852 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
854 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
855 vhdr
= (struct vlan_ethhdr
*)ethhdr
;
856 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
857 proto
= ntohs(vhdr
->h_vlan_encapsulated_proto
);
858 headlen
= sizeof(*vhdr
);
860 proto
= ntohs(ethhdr
->h_proto
);
864 if (proto
!= ETH_P_ARP
)
865 return 0; /* not a claim frame */
867 /* this must be a ARP frame. check if it is a claim. */
869 if (unlikely(!pskb_may_pull(skb
, headlen
+ arp_hdr_len(skb
->dev
))))
872 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
873 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
874 arphdr
= (struct arphdr
*)((uint8_t *)ethhdr
+ headlen
);
876 /* Check whether the ARP frame carries a valid
879 if (arphdr
->ar_hrd
!= htons(ARPHRD_ETHER
))
881 if (arphdr
->ar_pro
!= htons(ETH_P_IP
))
883 if (arphdr
->ar_hln
!= ETH_ALEN
)
885 if (arphdr
->ar_pln
!= 4)
888 hw_src
= (uint8_t *)arphdr
+ sizeof(struct arphdr
);
889 hw_dst
= hw_src
+ ETH_ALEN
+ 4;
890 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
892 /* check if it is a claim frame. */
893 ret
= batadv_check_claim_group(bat_priv
, primary_if
, hw_src
, hw_dst
,
896 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
897 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
898 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
903 /* become a backbone gw ourselves on this vlan if not happened yet */
904 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
906 /* check for the different types of claim frames ... */
907 switch (bla_dst
->type
) {
908 case BATADV_CLAIM_TYPE_CLAIM
:
909 if (batadv_handle_claim(bat_priv
, primary_if
, hw_src
,
910 ethhdr
->h_source
, vid
))
913 case BATADV_CLAIM_TYPE_UNCLAIM
:
914 if (batadv_handle_unclaim(bat_priv
, primary_if
,
915 ethhdr
->h_source
, hw_src
, vid
))
919 case BATADV_CLAIM_TYPE_ANNOUNCE
:
920 if (batadv_handle_announce(bat_priv
, hw_src
, ethhdr
->h_source
,
924 case BATADV_CLAIM_TYPE_REQUEST
:
925 if (batadv_handle_request(bat_priv
, primary_if
, hw_src
, ethhdr
,
931 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
932 "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",
933 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
937 /* Check when we last heard from other nodes, and remove them in case of
938 * a time out, or clean all backbone gws if now is set.
940 static void batadv_bla_purge_backbone_gw(struct batadv_priv
*bat_priv
, int now
)
942 struct batadv_backbone_gw
*backbone_gw
;
943 struct hlist_node
*node
, *node_tmp
;
944 struct hlist_head
*head
;
945 struct batadv_hashtable
*hash
;
946 spinlock_t
*list_lock
; /* protects write access to the hash lists */
949 hash
= bat_priv
->bla
.backbone_hash
;
953 for (i
= 0; i
< hash
->size
; i
++) {
954 head
= &hash
->table
[i
];
955 list_lock
= &hash
->list_locks
[i
];
957 spin_lock_bh(list_lock
);
958 hlist_for_each_entry_safe(backbone_gw
, node
, node_tmp
,
962 if (!batadv_has_timed_out(backbone_gw
->lasttime
,
963 BATADV_BLA_BACKBONE_TIMEOUT
))
966 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
967 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
971 /* don't wait for the pending request anymore */
972 if (atomic_read(&backbone_gw
->request_sent
))
973 atomic_dec(&bat_priv
->bla
.num_requests
);
975 batadv_bla_del_backbone_claims(backbone_gw
);
978 batadv_backbone_gw_free_ref(backbone_gw
);
980 spin_unlock_bh(list_lock
);
985 * batadv_bla_purge_claims
986 * @bat_priv: the bat priv with all the soft interface information
987 * @primary_if: the selected primary interface, may be NULL if now is set
988 * @now: whether the whole hash shall be wiped now
990 * Check when we heard last time from our own claims, and remove them in case of
991 * a time out, or clean all claims if now is set
993 static void batadv_bla_purge_claims(struct batadv_priv
*bat_priv
,
994 struct batadv_hard_iface
*primary_if
,
997 struct batadv_claim
*claim
;
998 struct hlist_node
*node
;
999 struct hlist_head
*head
;
1000 struct batadv_hashtable
*hash
;
1003 hash
= bat_priv
->bla
.claim_hash
;
1007 for (i
= 0; i
< hash
->size
; i
++) {
1008 head
= &hash
->table
[i
];
1011 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1014 if (!batadv_compare_eth(claim
->backbone_gw
->orig
,
1015 primary_if
->net_dev
->dev_addr
))
1017 if (!batadv_has_timed_out(claim
->lasttime
,
1018 BATADV_BLA_CLAIM_TIMEOUT
))
1021 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1022 "bla_purge_claims(): %pM, vid %d, time out\n",
1023 claim
->addr
, claim
->vid
);
1026 batadv_handle_unclaim(bat_priv
, primary_if
,
1027 claim
->backbone_gw
->orig
,
1028 claim
->addr
, claim
->vid
);
1035 * batadv_bla_update_orig_address
1036 * @bat_priv: the bat priv with all the soft interface information
1037 * @primary_if: the new selected primary_if
1038 * @oldif: the old primary interface, may be NULL
1040 * Update the backbone gateways when the own orig address changes.
1042 void batadv_bla_update_orig_address(struct batadv_priv
*bat_priv
,
1043 struct batadv_hard_iface
*primary_if
,
1044 struct batadv_hard_iface
*oldif
)
1046 struct batadv_backbone_gw
*backbone_gw
;
1047 struct hlist_node
*node
;
1048 struct hlist_head
*head
;
1049 struct batadv_hashtable
*hash
;
1053 /* reset bridge loop avoidance group id */
1054 group
= htons(crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
));
1055 bat_priv
->bla
.claim_dest
.group
= group
;
1058 batadv_bla_purge_claims(bat_priv
, NULL
, 1);
1059 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1063 hash
= bat_priv
->bla
.backbone_hash
;
1067 for (i
= 0; i
< hash
->size
; i
++) {
1068 head
= &hash
->table
[i
];
1071 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1072 /* own orig still holds the old value. */
1073 if (!batadv_compare_eth(backbone_gw
->orig
,
1074 oldif
->net_dev
->dev_addr
))
1077 memcpy(backbone_gw
->orig
,
1078 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1079 /* send an announce frame so others will ask for our
1080 * claims and update their tables.
1082 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1090 /* (re)start the timer */
1091 static void batadv_bla_start_timer(struct batadv_priv
*bat_priv
)
1093 INIT_DELAYED_WORK(&bat_priv
->bla
.work
, batadv_bla_periodic_work
);
1094 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1095 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1098 /* periodic work to do:
1099 * * purge structures when they are too old
1100 * * send announcements
1102 static void batadv_bla_periodic_work(struct work_struct
*work
)
1104 struct delayed_work
*delayed_work
;
1105 struct batadv_priv
*bat_priv
;
1106 struct batadv_priv_bla
*priv_bla
;
1107 struct hlist_node
*node
;
1108 struct hlist_head
*head
;
1109 struct batadv_backbone_gw
*backbone_gw
;
1110 struct batadv_hashtable
*hash
;
1111 struct batadv_hard_iface
*primary_if
;
1114 delayed_work
= container_of(work
, struct delayed_work
, work
);
1115 priv_bla
= container_of(delayed_work
, struct batadv_priv_bla
, work
);
1116 bat_priv
= container_of(priv_bla
, struct batadv_priv
, bla
);
1117 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1121 batadv_bla_purge_claims(bat_priv
, primary_if
, 0);
1122 batadv_bla_purge_backbone_gw(bat_priv
, 0);
1124 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1127 hash
= bat_priv
->bla
.backbone_hash
;
1131 for (i
= 0; i
< hash
->size
; i
++) {
1132 head
= &hash
->table
[i
];
1135 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1136 if (!batadv_compare_eth(backbone_gw
->orig
,
1137 primary_if
->net_dev
->dev_addr
))
1140 backbone_gw
->lasttime
= jiffies
;
1142 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1148 batadv_hardif_free_ref(primary_if
);
1150 batadv_bla_start_timer(bat_priv
);
1153 /* The hash for claim and backbone hash receive the same key because they
1154 * are getting initialized by hash_new with the same key. Reinitializing
1155 * them with to different keys to allow nested locking without generating
1158 static struct lock_class_key batadv_claim_hash_lock_class_key
;
1159 static struct lock_class_key batadv_backbone_hash_lock_class_key
;
1161 /* initialize all bla structures */
1162 int batadv_bla_init(struct batadv_priv
*bat_priv
)
1165 uint8_t claim_dest
[ETH_ALEN
] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1166 struct batadv_hard_iface
*primary_if
;
1168 unsigned long entrytime
;
1170 spin_lock_init(&bat_priv
->bla
.bcast_duplist_lock
);
1172 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hash registering\n");
1174 /* setting claim destination address */
1175 memcpy(&bat_priv
->bla
.claim_dest
.magic
, claim_dest
, 3);
1176 bat_priv
->bla
.claim_dest
.type
= 0;
1177 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1179 crc
= crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1180 bat_priv
->bla
.claim_dest
.group
= htons(crc
);
1181 batadv_hardif_free_ref(primary_if
);
1183 bat_priv
->bla
.claim_dest
.group
= 0; /* will be set later */
1186 /* initialize the duplicate list */
1187 entrytime
= jiffies
- msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT
);
1188 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++)
1189 bat_priv
->bla
.bcast_duplist
[i
].entrytime
= entrytime
;
1190 bat_priv
->bla
.bcast_duplist_curr
= 0;
1192 if (bat_priv
->bla
.claim_hash
)
1195 bat_priv
->bla
.claim_hash
= batadv_hash_new(128);
1196 bat_priv
->bla
.backbone_hash
= batadv_hash_new(32);
1198 if (!bat_priv
->bla
.claim_hash
|| !bat_priv
->bla
.backbone_hash
)
1201 batadv_hash_set_lock_class(bat_priv
->bla
.claim_hash
,
1202 &batadv_claim_hash_lock_class_key
);
1203 batadv_hash_set_lock_class(bat_priv
->bla
.backbone_hash
,
1204 &batadv_backbone_hash_lock_class_key
);
1206 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hashes initialized\n");
1208 batadv_bla_start_timer(bat_priv
);
1213 * batadv_bla_check_bcast_duplist
1214 * @bat_priv: the bat priv with all the soft interface information
1215 * @bcast_packet: encapsulated broadcast frame plus batman header
1216 * @bcast_packet_len: length of encapsulated broadcast frame plus batman header
1218 * check if it is on our broadcast list. Another gateway might
1219 * have sent the same packet because it is connected to the same backbone,
1220 * so we have to remove this duplicate.
1222 * This is performed by checking the CRC, which will tell us
1223 * with a good chance that it is the same packet. If it is furthermore
1224 * sent by another host, drop it. We allow equal packets from
1225 * the same host however as this might be intended.
1227 int batadv_bla_check_bcast_duplist(struct batadv_priv
*bat_priv
,
1228 struct batadv_bcast_packet
*bcast_packet
,
1229 int bcast_packet_len
)
1231 int i
, length
, curr
, ret
= 0;
1234 struct batadv_bcast_duplist_entry
*entry
;
1236 length
= bcast_packet_len
- sizeof(*bcast_packet
);
1237 content
= (uint8_t *)bcast_packet
;
1238 content
+= sizeof(*bcast_packet
);
1240 /* calculate the crc ... */
1241 crc
= crc16(0, content
, length
);
1243 spin_lock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1245 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++) {
1246 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ i
);
1247 curr
%= BATADV_DUPLIST_SIZE
;
1248 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1250 /* we can stop searching if the entry is too old ;
1251 * later entries will be even older
1253 if (batadv_has_timed_out(entry
->entrytime
,
1254 BATADV_DUPLIST_TIMEOUT
))
1257 if (entry
->crc
!= crc
)
1260 if (batadv_compare_eth(entry
->orig
, bcast_packet
->orig
))
1263 /* this entry seems to match: same crc, not too old,
1264 * and from another gw. therefore return 1 to forbid it.
1269 /* not found, add a new entry (overwrite the oldest entry)
1270 * and allow it, its the first occurence.
1272 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ BATADV_DUPLIST_SIZE
- 1);
1273 curr
%= BATADV_DUPLIST_SIZE
;
1274 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1276 entry
->entrytime
= jiffies
;
1277 memcpy(entry
->orig
, bcast_packet
->orig
, ETH_ALEN
);
1278 bat_priv
->bla
.bcast_duplist_curr
= curr
;
1281 spin_unlock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1288 /* @bat_priv: the bat priv with all the soft interface information
1289 * @orig: originator mac address
1291 * check if the originator is a gateway for any VLAN ID.
1293 * returns 1 if it is found, 0 otherwise
1295 int batadv_bla_is_backbone_gw_orig(struct batadv_priv
*bat_priv
, uint8_t *orig
)
1297 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1298 struct hlist_head
*head
;
1299 struct hlist_node
*node
;
1300 struct batadv_backbone_gw
*backbone_gw
;
1303 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1309 for (i
= 0; i
< hash
->size
; i
++) {
1310 head
= &hash
->table
[i
];
1313 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1314 if (batadv_compare_eth(backbone_gw
->orig
, orig
)) {
1327 * batadv_bla_is_backbone_gw
1328 * @skb: the frame to be checked
1329 * @orig_node: the orig_node of the frame
1330 * @hdr_size: maximum length of the frame
1332 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1333 * if the orig_node is also a gateway on the soft interface, otherwise it
1336 int batadv_bla_is_backbone_gw(struct sk_buff
*skb
,
1337 struct batadv_orig_node
*orig_node
, int hdr_size
)
1339 struct ethhdr
*ethhdr
;
1340 struct vlan_ethhdr
*vhdr
;
1341 struct batadv_backbone_gw
*backbone_gw
;
1344 if (!atomic_read(&orig_node
->bat_priv
->bridge_loop_avoidance
))
1347 /* first, find out the vid. */
1348 if (!pskb_may_pull(skb
, hdr_size
+ ETH_HLEN
))
1351 ethhdr
= (struct ethhdr
*)(((uint8_t *)skb
->data
) + hdr_size
);
1353 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
1354 if (!pskb_may_pull(skb
, hdr_size
+ sizeof(struct vlan_ethhdr
)))
1357 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ hdr_size
);
1358 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1361 /* see if this originator is a backbone gw for this VLAN */
1362 backbone_gw
= batadv_backbone_hash_find(orig_node
->bat_priv
,
1363 orig_node
->orig
, vid
);
1367 batadv_backbone_gw_free_ref(backbone_gw
);
1371 /* free all bla structures (for softinterface free or module unload) */
1372 void batadv_bla_free(struct batadv_priv
*bat_priv
)
1374 struct batadv_hard_iface
*primary_if
;
1376 cancel_delayed_work_sync(&bat_priv
->bla
.work
);
1377 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1379 if (bat_priv
->bla
.claim_hash
) {
1380 batadv_bla_purge_claims(bat_priv
, primary_if
, 1);
1381 batadv_hash_destroy(bat_priv
->bla
.claim_hash
);
1382 bat_priv
->bla
.claim_hash
= NULL
;
1384 if (bat_priv
->bla
.backbone_hash
) {
1385 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1386 batadv_hash_destroy(bat_priv
->bla
.backbone_hash
);
1387 bat_priv
->bla
.backbone_hash
= NULL
;
1390 batadv_hardif_free_ref(primary_if
);
1395 * @bat_priv: the bat priv with all the soft interface information
1396 * @skb: the frame to be checked
1397 * @vid: the VLAN ID of the frame
1398 * @is_bcast: the packet came in a broadcast packet type.
1400 * bla_rx avoidance checks if:
1401 * * we have to race for a claim
1402 * * if the frame is allowed on the LAN
1404 * in these cases, the skb is further handled by this function and
1405 * returns 1, otherwise it returns 0 and the caller shall further
1408 int batadv_bla_rx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
,
1411 struct ethhdr
*ethhdr
;
1412 struct batadv_claim search_claim
, *claim
= NULL
;
1413 struct batadv_hard_iface
*primary_if
;
1416 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1418 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1422 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1426 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1427 /* don't allow broadcasts while requests are in flight */
1428 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
)
1431 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1432 search_claim
.vid
= vid
;
1433 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1436 /* possible optimization: race for a claim */
1437 /* No claim exists yet, claim it for us!
1439 batadv_handle_claim(bat_priv
, primary_if
,
1440 primary_if
->net_dev
->dev_addr
,
1441 ethhdr
->h_source
, vid
);
1445 /* if it is our own claim ... */
1446 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1447 primary_if
->net_dev
->dev_addr
)) {
1448 /* ... allow it in any case */
1449 claim
->lasttime
= jiffies
;
1453 /* if it is a broadcast ... */
1454 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
) {
1455 /* ... drop it. the responsible gateway is in charge.
1457 * We need to check is_bcast because with the gateway
1458 * feature, broadcasts (like DHCP requests) may be sent
1459 * using a unicast packet type.
1463 /* seems the client considers us as its best gateway.
1464 * send a claim and update the claim table
1467 batadv_handle_claim(bat_priv
, primary_if
,
1468 primary_if
->net_dev
->dev_addr
,
1469 ethhdr
->h_source
, vid
);
1473 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1483 batadv_hardif_free_ref(primary_if
);
1485 batadv_claim_free_ref(claim
);
1491 * @bat_priv: the bat priv with all the soft interface information
1492 * @skb: the frame to be checked
1493 * @vid: the VLAN ID of the frame
1496 * * a claim was received which has to be processed
1497 * * the frame is allowed on the mesh
1499 * in these cases, the skb is further handled by this function and
1500 * returns 1, otherwise it returns 0 and the caller shall further
1503 int batadv_bla_tx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
)
1505 struct ethhdr
*ethhdr
;
1506 struct batadv_claim search_claim
, *claim
= NULL
;
1507 struct batadv_hard_iface
*primary_if
;
1510 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1514 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1517 /* in VLAN case, the mac header might not be set. */
1518 skb_reset_mac_header(skb
);
1520 if (batadv_bla_process_claim(bat_priv
, primary_if
, skb
))
1523 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1525 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1526 /* don't allow broadcasts while requests are in flight */
1527 if (is_multicast_ether_addr(ethhdr
->h_dest
))
1530 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1531 search_claim
.vid
= vid
;
1533 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1535 /* if no claim exists, allow it. */
1539 /* check if we are responsible. */
1540 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1541 primary_if
->net_dev
->dev_addr
)) {
1542 /* if yes, the client has roamed and we have
1545 batadv_handle_unclaim(bat_priv
, primary_if
,
1546 primary_if
->net_dev
->dev_addr
,
1547 ethhdr
->h_source
, vid
);
1551 /* check if it is a multicast/broadcast frame */
1552 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
1553 /* drop it. the responsible gateway has forwarded it into
1554 * the backbone network.
1558 /* we must allow it. at least if we are
1559 * responsible for the DESTINATION.
1564 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1571 batadv_hardif_free_ref(primary_if
);
1573 batadv_claim_free_ref(claim
);
1577 int batadv_bla_claim_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1579 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1580 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1581 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
1582 struct batadv_claim
*claim
;
1583 struct batadv_hard_iface
*primary_if
;
1584 struct hlist_node
*node
;
1585 struct hlist_head
*head
;
1589 uint8_t *primary_addr
;
1591 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1593 ret
= seq_printf(seq
,
1594 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1599 if (primary_if
->if_status
!= BATADV_IF_ACTIVE
) {
1600 ret
= seq_printf(seq
,
1601 "BATMAN mesh %s disabled - primary interface not active\n",
1606 primary_addr
= primary_if
->net_dev
->dev_addr
;
1608 "Claims announced for the mesh %s (orig %pM, group id %04x)\n",
1609 net_dev
->name
, primary_addr
,
1610 ntohs(bat_priv
->bla
.claim_dest
.group
));
1611 seq_printf(seq
, " %-17s %-5s %-17s [o] (%-4s)\n",
1612 "Client", "VID", "Originator", "CRC");
1613 for (i
= 0; i
< hash
->size
; i
++) {
1614 head
= &hash
->table
[i
];
1617 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1618 is_own
= batadv_compare_eth(claim
->backbone_gw
->orig
,
1620 seq_printf(seq
, " * %pM on % 5d by %pM [%c] (%04x)\n",
1621 claim
->addr
, claim
->vid
,
1622 claim
->backbone_gw
->orig
,
1623 (is_own
? 'x' : ' '),
1624 claim
->backbone_gw
->crc
);
1630 batadv_hardif_free_ref(primary_if
);
1634 int batadv_bla_backbone_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1636 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1637 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1638 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1639 struct batadv_backbone_gw
*backbone_gw
;
1640 struct batadv_hard_iface
*primary_if
;
1641 struct hlist_node
*node
;
1642 struct hlist_head
*head
;
1647 uint8_t *primary_addr
;
1649 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1651 ret
= seq_printf(seq
,
1652 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
1657 if (primary_if
->if_status
!= BATADV_IF_ACTIVE
) {
1658 ret
= seq_printf(seq
,
1659 "BATMAN mesh %s disabled - primary interface not active\n",
1664 primary_addr
= primary_if
->net_dev
->dev_addr
;
1666 "Backbones announced for the mesh %s (orig %pM, group id %04x)\n",
1667 net_dev
->name
, primary_addr
,
1668 ntohs(bat_priv
->bla
.claim_dest
.group
));
1669 seq_printf(seq
, " %-17s %-5s %-9s (%-4s)\n",
1670 "Originator", "VID", "last seen", "CRC");
1671 for (i
= 0; i
< hash
->size
; i
++) {
1672 head
= &hash
->table
[i
];
1675 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1676 msecs
= jiffies_to_msecs(jiffies
-
1677 backbone_gw
->lasttime
);
1678 secs
= msecs
/ 1000;
1679 msecs
= msecs
% 1000;
1681 is_own
= batadv_compare_eth(backbone_gw
->orig
,
1687 " * %pM on % 5d % 4i.%03is (%04x)\n",
1688 backbone_gw
->orig
, backbone_gw
->vid
,
1689 secs
, msecs
, backbone_gw
->crc
);
1695 batadv_hardif_free_ref(primary_if
);