1 /* Copyright (C) 2011-2013 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
);
38 batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
39 struct batadv_bla_backbone_gw
*backbone_gw
);
41 /* return the index of the claim */
42 static inline uint32_t batadv_choose_claim(const void *data
, uint32_t size
)
44 struct batadv_bla_claim
*claim
= (struct batadv_bla_claim
*)data
;
47 hash
= batadv_hash_bytes(hash
, &claim
->addr
, sizeof(claim
->addr
));
48 hash
= batadv_hash_bytes(hash
, &claim
->vid
, sizeof(claim
->vid
));
57 /* return the index of the backbone gateway */
58 static inline uint32_t batadv_choose_backbone_gw(const void *data
,
61 const struct batadv_bla_claim
*claim
= (struct batadv_bla_claim
*)data
;
64 hash
= batadv_hash_bytes(hash
, &claim
->addr
, sizeof(claim
->addr
));
65 hash
= batadv_hash_bytes(hash
, &claim
->vid
, sizeof(claim
->vid
));
75 /* compares address and vid of two backbone gws */
76 static int batadv_compare_backbone_gw(const struct hlist_node
*node
,
79 const void *data1
= container_of(node
, struct batadv_bla_backbone_gw
,
81 const struct batadv_bla_backbone_gw
*gw1
= data1
, *gw2
= data2
;
83 if (!batadv_compare_eth(gw1
->orig
, gw2
->orig
))
86 if (gw1
->vid
!= gw2
->vid
)
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_bla_claim
,
98 const struct batadv_bla_claim
*cl1
= data1
, *cl2
= data2
;
100 if (!batadv_compare_eth(cl1
->addr
, cl2
->addr
))
103 if (cl1
->vid
!= cl2
->vid
)
109 /* free a backbone gw */
111 batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw
*backbone_gw
)
113 if (atomic_dec_and_test(&backbone_gw
->refcount
))
114 kfree_rcu(backbone_gw
, rcu
);
117 /* finally deinitialize the claim */
118 static void batadv_claim_free_rcu(struct rcu_head
*rcu
)
120 struct batadv_bla_claim
*claim
;
122 claim
= container_of(rcu
, struct batadv_bla_claim
, rcu
);
124 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
128 /* free a claim, call claim_free_rcu if its the last reference */
129 static void batadv_claim_free_ref(struct batadv_bla_claim
*claim
)
131 if (atomic_dec_and_test(&claim
->refcount
))
132 call_rcu(&claim
->rcu
, batadv_claim_free_rcu
);
135 /* @bat_priv: the bat priv with all the soft interface information
136 * @data: search data (may be local/static data)
138 * looks for a claim in the hash, and returns it if found
141 static struct batadv_bla_claim
142 *batadv_claim_hash_find(struct batadv_priv
*bat_priv
,
143 struct batadv_bla_claim
*data
)
145 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
146 struct hlist_head
*head
;
147 struct batadv_bla_claim
*claim
;
148 struct batadv_bla_claim
*claim_tmp
= NULL
;
154 index
= batadv_choose_claim(data
, hash
->size
);
155 head
= &hash
->table
[index
];
158 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
159 if (!batadv_compare_claim(&claim
->hash_entry
, data
))
162 if (!atomic_inc_not_zero(&claim
->refcount
))
174 * batadv_backbone_hash_find - looks for a claim in the hash
175 * @bat_priv: the bat priv with all the soft interface information
176 * @addr: the address of the originator
179 * Returns claim if found or NULL otherwise.
181 static struct batadv_bla_backbone_gw
*
182 batadv_backbone_hash_find(struct batadv_priv
*bat_priv
,
183 uint8_t *addr
, short vid
)
185 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
186 struct hlist_head
*head
;
187 struct batadv_bla_backbone_gw search_entry
, *backbone_gw
;
188 struct batadv_bla_backbone_gw
*backbone_gw_tmp
= NULL
;
194 memcpy(search_entry
.orig
, addr
, ETH_ALEN
);
195 search_entry
.vid
= vid
;
197 index
= batadv_choose_backbone_gw(&search_entry
, hash
->size
);
198 head
= &hash
->table
[index
];
201 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
202 if (!batadv_compare_backbone_gw(&backbone_gw
->hash_entry
,
206 if (!atomic_inc_not_zero(&backbone_gw
->refcount
))
209 backbone_gw_tmp
= backbone_gw
;
214 return backbone_gw_tmp
;
217 /* delete all claims for a backbone */
219 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw
*backbone_gw
)
221 struct batadv_hashtable
*hash
;
222 struct hlist_node
*node_tmp
;
223 struct hlist_head
*head
;
224 struct batadv_bla_claim
*claim
;
226 spinlock_t
*list_lock
; /* protects write access to the hash lists */
228 hash
= backbone_gw
->bat_priv
->bla
.claim_hash
;
232 for (i
= 0; i
< hash
->size
; i
++) {
233 head
= &hash
->table
[i
];
234 list_lock
= &hash
->list_locks
[i
];
236 spin_lock_bh(list_lock
);
237 hlist_for_each_entry_safe(claim
, node_tmp
,
239 if (claim
->backbone_gw
!= backbone_gw
)
242 batadv_claim_free_ref(claim
);
243 hlist_del_rcu(&claim
->hash_entry
);
245 spin_unlock_bh(list_lock
);
248 /* all claims gone, intialize CRC */
249 backbone_gw
->crc
= BATADV_BLA_CRC_INIT
;
253 * batadv_bla_send_claim - sends a claim frame according to the provided info
254 * @bat_priv: the bat priv with all the soft interface information
255 * @orig: the mac address to be announced within the claim
257 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
259 static void batadv_bla_send_claim(struct batadv_priv
*bat_priv
, uint8_t *mac
,
260 short vid
, int claimtype
)
263 struct ethhdr
*ethhdr
;
264 struct batadv_hard_iface
*primary_if
;
265 struct net_device
*soft_iface
;
267 struct batadv_bla_claim_dst local_claim_dest
;
270 primary_if
= batadv_primary_if_get_selected(bat_priv
);
274 memcpy(&local_claim_dest
, &bat_priv
->bla
.claim_dest
,
275 sizeof(local_claim_dest
));
276 local_claim_dest
.type
= claimtype
;
278 soft_iface
= primary_if
->soft_iface
;
280 skb
= arp_create(ARPOP_REPLY
, ETH_P_ARP
,
281 /* IP DST: 0.0.0.0 */
283 primary_if
->soft_iface
,
284 /* IP SRC: 0.0.0.0 */
286 /* Ethernet DST: Broadcast */
288 /* Ethernet SRC/HW SRC: originator mac */
289 primary_if
->net_dev
->dev_addr
,
290 /* HW DST: FF:43:05:XX:YY:YY
291 * with XX = claim type
292 * and YY:YY = group id
294 (uint8_t *)&local_claim_dest
);
299 ethhdr
= (struct ethhdr
*)skb
->data
;
300 hw_src
= (uint8_t *)ethhdr
+ ETH_HLEN
+ sizeof(struct arphdr
);
302 /* now we pretend that the client would have sent this ... */
304 case BATADV_CLAIM_TYPE_CLAIM
:
305 /* normal claim frame
306 * set Ethernet SRC to the clients mac
308 memcpy(ethhdr
->h_source
, mac
, ETH_ALEN
);
309 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
310 "bla_send_claim(): CLAIM %pM on vid %d\n", mac
, vid
);
312 case BATADV_CLAIM_TYPE_UNCLAIM
:
314 * set HW SRC to the clients mac
316 memcpy(hw_src
, mac
, ETH_ALEN
);
317 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
318 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac
,
321 case BATADV_CLAIM_TYPE_ANNOUNCE
:
322 /* announcement frame
323 * set HW SRC to the special mac containg the crc
325 memcpy(hw_src
, mac
, ETH_ALEN
);
326 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
327 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
328 ethhdr
->h_source
, vid
);
330 case BATADV_CLAIM_TYPE_REQUEST
:
332 * set HW SRC and header destination to the receiving backbone
335 memcpy(hw_src
, mac
, ETH_ALEN
);
336 memcpy(ethhdr
->h_dest
, mac
, ETH_ALEN
);
337 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
338 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
339 ethhdr
->h_source
, ethhdr
->h_dest
, vid
);
344 skb
= vlan_insert_tag(skb
, htons(ETH_P_8021Q
), vid
);
346 skb_reset_mac_header(skb
);
347 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
348 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
349 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
350 skb
->len
+ ETH_HLEN
);
351 soft_iface
->last_rx
= jiffies
;
356 batadv_hardif_free_ref(primary_if
);
360 * batadv_bla_get_backbone_gw
361 * @bat_priv: the bat priv with all the soft interface information
362 * @orig: the mac address of the originator
365 * searches for the backbone gw or creates a new one if it could not
368 static struct batadv_bla_backbone_gw
*
369 batadv_bla_get_backbone_gw(struct batadv_priv
*bat_priv
, uint8_t *orig
,
370 short vid
, bool own_backbone
)
372 struct batadv_bla_backbone_gw
*entry
;
373 struct batadv_orig_node
*orig_node
;
376 entry
= batadv_backbone_hash_find(bat_priv
, orig
, vid
);
381 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
382 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
385 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
390 entry
->lasttime
= jiffies
;
391 entry
->crc
= BATADV_BLA_CRC_INIT
;
392 entry
->bat_priv
= bat_priv
;
393 atomic_set(&entry
->request_sent
, 0);
394 atomic_set(&entry
->wait_periods
, 0);
395 memcpy(entry
->orig
, orig
, ETH_ALEN
);
397 /* one for the hash, one for returning */
398 atomic_set(&entry
->refcount
, 2);
400 hash_added
= batadv_hash_add(bat_priv
->bla
.backbone_hash
,
401 batadv_compare_backbone_gw
,
402 batadv_choose_backbone_gw
, entry
,
405 if (unlikely(hash_added
!= 0)) {
406 /* hash failed, free the structure */
411 /* this is a gateway now, remove any tt entries */
412 orig_node
= batadv_orig_hash_find(bat_priv
, orig
);
414 batadv_tt_global_del_orig(bat_priv
, orig_node
,
415 "became a backbone gateway");
416 batadv_orig_node_free_ref(orig_node
);
420 batadv_bla_send_announce(bat_priv
, entry
);
422 /* this will be decreased in the worker thread */
423 atomic_inc(&entry
->request_sent
);
424 atomic_set(&entry
->wait_periods
, BATADV_BLA_WAIT_PERIODS
);
425 atomic_inc(&bat_priv
->bla
.num_requests
);
431 /* update or add the own backbone gw to make sure we announce
432 * where we receive other backbone gws
435 batadv_bla_update_own_backbone_gw(struct batadv_priv
*bat_priv
,
436 struct batadv_hard_iface
*primary_if
,
439 struct batadv_bla_backbone_gw
*backbone_gw
;
441 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
,
442 primary_if
->net_dev
->dev_addr
,
444 if (unlikely(!backbone_gw
))
447 backbone_gw
->lasttime
= jiffies
;
448 batadv_backbone_gw_free_ref(backbone_gw
);
451 /* @bat_priv: the bat priv with all the soft interface information
452 * @vid: the vid where the request came on
454 * Repeat all of our own claims, and finally send an ANNOUNCE frame
455 * to allow the requester another check if the CRC is correct now.
457 static void batadv_bla_answer_request(struct batadv_priv
*bat_priv
,
458 struct batadv_hard_iface
*primary_if
,
461 struct hlist_head
*head
;
462 struct batadv_hashtable
*hash
;
463 struct batadv_bla_claim
*claim
;
464 struct batadv_bla_backbone_gw
*backbone_gw
;
467 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
468 "bla_answer_request(): received a claim request, send all of our own claims again\n");
470 backbone_gw
= batadv_backbone_hash_find(bat_priv
,
471 primary_if
->net_dev
->dev_addr
,
476 hash
= bat_priv
->bla
.claim_hash
;
477 for (i
= 0; i
< hash
->size
; i
++) {
478 head
= &hash
->table
[i
];
481 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
482 /* only own claims are interesting */
483 if (claim
->backbone_gw
!= backbone_gw
)
486 batadv_bla_send_claim(bat_priv
, claim
->addr
, claim
->vid
,
487 BATADV_CLAIM_TYPE_CLAIM
);
492 /* finally, send an announcement frame */
493 batadv_bla_send_announce(bat_priv
, backbone_gw
);
494 batadv_backbone_gw_free_ref(backbone_gw
);
497 /* @backbone_gw: the backbone gateway from whom we are out of sync
499 * When the crc is wrong, ask the backbone gateway for a full table update.
500 * After the request, it will repeat all of his own claims and finally
501 * send an announcement claim with which we can check again.
503 static void batadv_bla_send_request(struct batadv_bla_backbone_gw
*backbone_gw
)
505 /* first, remove all old entries */
506 batadv_bla_del_backbone_claims(backbone_gw
);
508 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
509 "Sending REQUEST to %pM\n", backbone_gw
->orig
);
512 batadv_bla_send_claim(backbone_gw
->bat_priv
, backbone_gw
->orig
,
513 backbone_gw
->vid
, BATADV_CLAIM_TYPE_REQUEST
);
515 /* no local broadcasts should be sent or received, for now. */
516 if (!atomic_read(&backbone_gw
->request_sent
)) {
517 atomic_inc(&backbone_gw
->bat_priv
->bla
.num_requests
);
518 atomic_set(&backbone_gw
->request_sent
, 1);
522 /* @bat_priv: the bat priv with all the soft interface information
523 * @backbone_gw: our backbone gateway which should be announced
525 * This function sends an announcement. It is called from multiple
528 static void batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
529 struct batadv_bla_backbone_gw
*backbone_gw
)
531 uint8_t mac
[ETH_ALEN
];
534 memcpy(mac
, batadv_announce_mac
, 4);
535 crc
= htons(backbone_gw
->crc
);
536 memcpy(&mac
[4], &crc
, 2);
538 batadv_bla_send_claim(bat_priv
, mac
, backbone_gw
->vid
,
539 BATADV_CLAIM_TYPE_ANNOUNCE
);
543 * batadv_bla_add_claim - Adds a claim in the claim hash
544 * @bat_priv: the bat priv with all the soft interface information
545 * @mac: the mac address of the claim
546 * @vid: the VLAN ID of the frame
547 * @backbone_gw: the backbone gateway which claims it
549 static void batadv_bla_add_claim(struct batadv_priv
*bat_priv
,
550 const uint8_t *mac
, const short vid
,
551 struct batadv_bla_backbone_gw
*backbone_gw
)
553 struct batadv_bla_claim
*claim
;
554 struct batadv_bla_claim search_claim
;
557 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
558 search_claim
.vid
= vid
;
559 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
561 /* create a new claim entry if it does not exist yet. */
563 claim
= kzalloc(sizeof(*claim
), GFP_ATOMIC
);
567 memcpy(claim
->addr
, mac
, ETH_ALEN
);
569 claim
->lasttime
= jiffies
;
570 claim
->backbone_gw
= backbone_gw
;
572 atomic_set(&claim
->refcount
, 2);
573 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
574 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
576 hash_added
= batadv_hash_add(bat_priv
->bla
.claim_hash
,
577 batadv_compare_claim
,
578 batadv_choose_claim
, claim
,
581 if (unlikely(hash_added
!= 0)) {
582 /* only local changes happened. */
587 claim
->lasttime
= jiffies
;
588 if (claim
->backbone_gw
== backbone_gw
)
589 /* no need to register a new backbone */
592 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
593 "bla_add_claim(): changing ownership for %pM, vid %d\n",
596 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
597 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
599 /* set (new) backbone gw */
600 atomic_inc(&backbone_gw
->refcount
);
601 claim
->backbone_gw
= backbone_gw
;
603 backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
604 backbone_gw
->lasttime
= jiffies
;
607 batadv_claim_free_ref(claim
);
610 /* Delete a claim from the claim hash which has the
611 * given mac address and vid.
613 static void batadv_bla_del_claim(struct batadv_priv
*bat_priv
,
614 const uint8_t *mac
, const short vid
)
616 struct batadv_bla_claim search_claim
, *claim
;
618 memcpy(search_claim
.addr
, mac
, ETH_ALEN
);
619 search_claim
.vid
= vid
;
620 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
624 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla_del_claim(): %pM, vid %d\n",
627 batadv_hash_remove(bat_priv
->bla
.claim_hash
, batadv_compare_claim
,
628 batadv_choose_claim
, claim
);
629 batadv_claim_free_ref(claim
); /* reference from the hash is gone */
631 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
633 /* don't need the reference from hash_find() anymore */
634 batadv_claim_free_ref(claim
);
637 /* check for ANNOUNCE frame, return 1 if handled */
638 static int batadv_handle_announce(struct batadv_priv
*bat_priv
,
639 uint8_t *an_addr
, uint8_t *backbone_addr
,
642 struct batadv_bla_backbone_gw
*backbone_gw
;
645 if (memcmp(an_addr
, batadv_announce_mac
, 4) != 0)
648 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
,
651 if (unlikely(!backbone_gw
))
655 /* handle as ANNOUNCE frame */
656 backbone_gw
->lasttime
= jiffies
;
657 crc
= ntohs(*((__be16
*)(&an_addr
[4])));
659 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
660 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
661 vid
, backbone_gw
->orig
, crc
);
663 if (backbone_gw
->crc
!= crc
) {
664 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
665 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
666 backbone_gw
->orig
, backbone_gw
->vid
,
667 backbone_gw
->crc
, crc
);
669 batadv_bla_send_request(backbone_gw
);
671 /* if we have sent a request and the crc was OK,
672 * we can allow traffic again.
674 if (atomic_read(&backbone_gw
->request_sent
)) {
675 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
676 atomic_set(&backbone_gw
->request_sent
, 0);
680 batadv_backbone_gw_free_ref(backbone_gw
);
684 /* check for REQUEST frame, return 1 if handled */
685 static int batadv_handle_request(struct batadv_priv
*bat_priv
,
686 struct batadv_hard_iface
*primary_if
,
687 uint8_t *backbone_addr
,
688 struct ethhdr
*ethhdr
, short vid
)
690 /* check for REQUEST frame */
691 if (!batadv_compare_eth(backbone_addr
, ethhdr
->h_dest
))
694 /* sanity check, this should not happen on a normal switch,
695 * we ignore it in this case.
697 if (!batadv_compare_eth(ethhdr
->h_dest
, primary_if
->net_dev
->dev_addr
))
700 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
701 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
702 vid
, ethhdr
->h_source
);
704 batadv_bla_answer_request(bat_priv
, primary_if
, vid
);
708 /* check for UNCLAIM frame, return 1 if handled */
709 static int batadv_handle_unclaim(struct batadv_priv
*bat_priv
,
710 struct batadv_hard_iface
*primary_if
,
711 uint8_t *backbone_addr
,
712 uint8_t *claim_addr
, short vid
)
714 struct batadv_bla_backbone_gw
*backbone_gw
;
716 /* unclaim in any case if it is our own */
717 if (primary_if
&& batadv_compare_eth(backbone_addr
,
718 primary_if
->net_dev
->dev_addr
))
719 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
720 BATADV_CLAIM_TYPE_UNCLAIM
);
722 backbone_gw
= batadv_backbone_hash_find(bat_priv
, backbone_addr
, vid
);
727 /* this must be an UNCLAIM frame */
728 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
729 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
730 claim_addr
, vid
, backbone_gw
->orig
);
732 batadv_bla_del_claim(bat_priv
, claim_addr
, vid
);
733 batadv_backbone_gw_free_ref(backbone_gw
);
737 /* check for CLAIM frame, return 1 if handled */
738 static int batadv_handle_claim(struct batadv_priv
*bat_priv
,
739 struct batadv_hard_iface
*primary_if
,
740 uint8_t *backbone_addr
, uint8_t *claim_addr
,
743 struct batadv_bla_backbone_gw
*backbone_gw
;
745 /* register the gateway if not yet available, and add the claim. */
747 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
,
750 if (unlikely(!backbone_gw
))
753 /* this must be a CLAIM frame */
754 batadv_bla_add_claim(bat_priv
, claim_addr
, vid
, backbone_gw
);
755 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
756 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
757 BATADV_CLAIM_TYPE_CLAIM
);
759 /* TODO: we could call something like tt_local_del() here. */
761 batadv_backbone_gw_free_ref(backbone_gw
);
766 * batadv_check_claim_group
767 * @bat_priv: the bat priv with all the soft interface information
768 * @hw_src: the Hardware source in the ARP Header
769 * @hw_dst: the Hardware destination in the ARP Header
770 * @ethhdr: pointer to the Ethernet header of the claim frame
772 * checks if it is a claim packet and if its on the same group.
773 * This function also applies the group ID of the sender
774 * if it is in the same mesh.
777 * 2 - if it is a claim packet and on the same group
778 * 1 - if is a claim packet from another group
779 * 0 - if it is not a claim packet
781 static int batadv_check_claim_group(struct batadv_priv
*bat_priv
,
782 struct batadv_hard_iface
*primary_if
,
783 uint8_t *hw_src
, uint8_t *hw_dst
,
784 struct ethhdr
*ethhdr
)
786 uint8_t *backbone_addr
;
787 struct batadv_orig_node
*orig_node
;
788 struct batadv_bla_claim_dst
*bla_dst
, *bla_dst_own
;
790 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
791 bla_dst_own
= &bat_priv
->bla
.claim_dest
;
793 /* check if it is a claim packet in general */
794 if (memcmp(bla_dst
->magic
, bla_dst_own
->magic
,
795 sizeof(bla_dst
->magic
)) != 0)
798 /* if announcement packet, use the source,
799 * otherwise assume it is in the hw_src
801 switch (bla_dst
->type
) {
802 case BATADV_CLAIM_TYPE_CLAIM
:
803 backbone_addr
= hw_src
;
805 case BATADV_CLAIM_TYPE_REQUEST
:
806 case BATADV_CLAIM_TYPE_ANNOUNCE
:
807 case BATADV_CLAIM_TYPE_UNCLAIM
:
808 backbone_addr
= ethhdr
->h_source
;
814 /* don't accept claim frames from ourselves */
815 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
818 /* if its already the same group, it is fine. */
819 if (bla_dst
->group
== bla_dst_own
->group
)
822 /* lets see if this originator is in our mesh */
823 orig_node
= batadv_orig_hash_find(bat_priv
, backbone_addr
);
825 /* dont accept claims from gateways which are not in
826 * the same mesh or group.
831 /* if our mesh friends mac is bigger, use it for ourselves. */
832 if (ntohs(bla_dst
->group
) > ntohs(bla_dst_own
->group
)) {
833 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
834 "taking other backbones claim group: %#.4x\n",
835 ntohs(bla_dst
->group
));
836 bla_dst_own
->group
= bla_dst
->group
;
839 batadv_orig_node_free_ref(orig_node
);
845 /* @bat_priv: the bat priv with all the soft interface information
846 * @skb: the frame to be checked
848 * Check if this is a claim frame, and process it accordingly.
850 * returns 1 if it was a claim frame, otherwise return 0 to
851 * tell the callee that it can use the frame on its own.
853 static int batadv_bla_process_claim(struct batadv_priv
*bat_priv
,
854 struct batadv_hard_iface
*primary_if
,
857 struct ethhdr
*ethhdr
;
858 struct vlan_ethhdr
*vhdr
;
859 struct arphdr
*arphdr
;
860 uint8_t *hw_src
, *hw_dst
;
861 struct batadv_bla_claim_dst
*bla_dst
;
867 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
869 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
870 vhdr
= (struct vlan_ethhdr
*)ethhdr
;
871 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
872 proto
= ntohs(vhdr
->h_vlan_encapsulated_proto
);
873 headlen
= sizeof(*vhdr
);
875 proto
= ntohs(ethhdr
->h_proto
);
879 if (proto
!= ETH_P_ARP
)
880 return 0; /* not a claim frame */
882 /* this must be a ARP frame. check if it is a claim. */
884 if (unlikely(!pskb_may_pull(skb
, headlen
+ arp_hdr_len(skb
->dev
))))
887 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
888 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
889 arphdr
= (struct arphdr
*)((uint8_t *)ethhdr
+ headlen
);
891 /* Check whether the ARP frame carries a valid
894 if (arphdr
->ar_hrd
!= htons(ARPHRD_ETHER
))
896 if (arphdr
->ar_pro
!= htons(ETH_P_IP
))
898 if (arphdr
->ar_hln
!= ETH_ALEN
)
900 if (arphdr
->ar_pln
!= 4)
903 hw_src
= (uint8_t *)arphdr
+ sizeof(struct arphdr
);
904 hw_dst
= hw_src
+ ETH_ALEN
+ 4;
905 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
907 /* check if it is a claim frame. */
908 ret
= batadv_check_claim_group(bat_priv
, primary_if
, hw_src
, hw_dst
,
911 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
912 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
913 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
918 /* become a backbone gw ourselves on this vlan if not happened yet */
919 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
921 /* check for the different types of claim frames ... */
922 switch (bla_dst
->type
) {
923 case BATADV_CLAIM_TYPE_CLAIM
:
924 if (batadv_handle_claim(bat_priv
, primary_if
, hw_src
,
925 ethhdr
->h_source
, vid
))
928 case BATADV_CLAIM_TYPE_UNCLAIM
:
929 if (batadv_handle_unclaim(bat_priv
, primary_if
,
930 ethhdr
->h_source
, hw_src
, vid
))
934 case BATADV_CLAIM_TYPE_ANNOUNCE
:
935 if (batadv_handle_announce(bat_priv
, hw_src
, ethhdr
->h_source
,
939 case BATADV_CLAIM_TYPE_REQUEST
:
940 if (batadv_handle_request(bat_priv
, primary_if
, hw_src
, ethhdr
,
946 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
947 "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",
948 ethhdr
->h_source
, vid
, hw_src
, hw_dst
);
952 /* Check when we last heard from other nodes, and remove them in case of
953 * a time out, or clean all backbone gws if now is set.
955 static void batadv_bla_purge_backbone_gw(struct batadv_priv
*bat_priv
, int now
)
957 struct batadv_bla_backbone_gw
*backbone_gw
;
958 struct hlist_node
*node_tmp
;
959 struct hlist_head
*head
;
960 struct batadv_hashtable
*hash
;
961 spinlock_t
*list_lock
; /* protects write access to the hash lists */
964 hash
= bat_priv
->bla
.backbone_hash
;
968 for (i
= 0; i
< hash
->size
; i
++) {
969 head
= &hash
->table
[i
];
970 list_lock
= &hash
->list_locks
[i
];
972 spin_lock_bh(list_lock
);
973 hlist_for_each_entry_safe(backbone_gw
, node_tmp
,
977 if (!batadv_has_timed_out(backbone_gw
->lasttime
,
978 BATADV_BLA_BACKBONE_TIMEOUT
))
981 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
982 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
986 /* don't wait for the pending request anymore */
987 if (atomic_read(&backbone_gw
->request_sent
))
988 atomic_dec(&bat_priv
->bla
.num_requests
);
990 batadv_bla_del_backbone_claims(backbone_gw
);
992 hlist_del_rcu(&backbone_gw
->hash_entry
);
993 batadv_backbone_gw_free_ref(backbone_gw
);
995 spin_unlock_bh(list_lock
);
1000 * batadv_bla_purge_claims
1001 * @bat_priv: the bat priv with all the soft interface information
1002 * @primary_if: the selected primary interface, may be NULL if now is set
1003 * @now: whether the whole hash shall be wiped now
1005 * Check when we heard last time from our own claims, and remove them in case of
1006 * a time out, or clean all claims if now is set
1008 static void batadv_bla_purge_claims(struct batadv_priv
*bat_priv
,
1009 struct batadv_hard_iface
*primary_if
,
1012 struct batadv_bla_claim
*claim
;
1013 struct hlist_head
*head
;
1014 struct batadv_hashtable
*hash
;
1017 hash
= bat_priv
->bla
.claim_hash
;
1021 for (i
= 0; i
< hash
->size
; i
++) {
1022 head
= &hash
->table
[i
];
1025 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
1028 if (!batadv_compare_eth(claim
->backbone_gw
->orig
,
1029 primary_if
->net_dev
->dev_addr
))
1031 if (!batadv_has_timed_out(claim
->lasttime
,
1032 BATADV_BLA_CLAIM_TIMEOUT
))
1035 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1036 "bla_purge_claims(): %pM, vid %d, time out\n",
1037 claim
->addr
, claim
->vid
);
1040 batadv_handle_unclaim(bat_priv
, primary_if
,
1041 claim
->backbone_gw
->orig
,
1042 claim
->addr
, claim
->vid
);
1049 * batadv_bla_update_orig_address
1050 * @bat_priv: the bat priv with all the soft interface information
1051 * @primary_if: the new selected primary_if
1052 * @oldif: the old primary interface, may be NULL
1054 * Update the backbone gateways when the own orig address changes.
1056 void batadv_bla_update_orig_address(struct batadv_priv
*bat_priv
,
1057 struct batadv_hard_iface
*primary_if
,
1058 struct batadv_hard_iface
*oldif
)
1060 struct batadv_bla_backbone_gw
*backbone_gw
;
1061 struct hlist_head
*head
;
1062 struct batadv_hashtable
*hash
;
1066 /* reset bridge loop avoidance group id */
1067 group
= htons(crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
));
1068 bat_priv
->bla
.claim_dest
.group
= group
;
1070 /* purge everything when bridge loop avoidance is turned off */
1071 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1075 batadv_bla_purge_claims(bat_priv
, NULL
, 1);
1076 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1080 hash
= bat_priv
->bla
.backbone_hash
;
1084 for (i
= 0; i
< hash
->size
; i
++) {
1085 head
= &hash
->table
[i
];
1088 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1089 /* own orig still holds the old value. */
1090 if (!batadv_compare_eth(backbone_gw
->orig
,
1091 oldif
->net_dev
->dev_addr
))
1094 memcpy(backbone_gw
->orig
,
1095 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1096 /* send an announce frame so others will ask for our
1097 * claims and update their tables.
1099 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1105 /* periodic work to do:
1106 * * purge structures when they are too old
1107 * * send announcements
1109 static void batadv_bla_periodic_work(struct work_struct
*work
)
1111 struct delayed_work
*delayed_work
;
1112 struct batadv_priv
*bat_priv
;
1113 struct batadv_priv_bla
*priv_bla
;
1114 struct hlist_head
*head
;
1115 struct batadv_bla_backbone_gw
*backbone_gw
;
1116 struct batadv_hashtable
*hash
;
1117 struct batadv_hard_iface
*primary_if
;
1120 delayed_work
= container_of(work
, struct delayed_work
, work
);
1121 priv_bla
= container_of(delayed_work
, struct batadv_priv_bla
, work
);
1122 bat_priv
= container_of(priv_bla
, struct batadv_priv
, bla
);
1123 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1127 batadv_bla_purge_claims(bat_priv
, primary_if
, 0);
1128 batadv_bla_purge_backbone_gw(bat_priv
, 0);
1130 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1133 hash
= bat_priv
->bla
.backbone_hash
;
1137 for (i
= 0; i
< hash
->size
; i
++) {
1138 head
= &hash
->table
[i
];
1141 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1142 if (!batadv_compare_eth(backbone_gw
->orig
,
1143 primary_if
->net_dev
->dev_addr
))
1146 backbone_gw
->lasttime
= jiffies
;
1148 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1150 /* request_sent is only set after creation to avoid
1151 * problems when we are not yet known as backbone gw
1154 * We can reset this now after we waited some periods
1155 * to give bridge forward delays and bla group forming
1159 if (atomic_read(&backbone_gw
->request_sent
) == 0)
1162 if (!atomic_dec_and_test(&backbone_gw
->wait_periods
))
1165 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
1166 atomic_set(&backbone_gw
->request_sent
, 0);
1172 batadv_hardif_free_ref(primary_if
);
1174 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1175 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1178 /* The hash for claim and backbone hash receive the same key because they
1179 * are getting initialized by hash_new with the same key. Reinitializing
1180 * them with to different keys to allow nested locking without generating
1183 static struct lock_class_key batadv_claim_hash_lock_class_key
;
1184 static struct lock_class_key batadv_backbone_hash_lock_class_key
;
1186 /* initialize all bla structures */
1187 int batadv_bla_init(struct batadv_priv
*bat_priv
)
1190 uint8_t claim_dest
[ETH_ALEN
] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1191 struct batadv_hard_iface
*primary_if
;
1193 unsigned long entrytime
;
1195 spin_lock_init(&bat_priv
->bla
.bcast_duplist_lock
);
1197 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hash registering\n");
1199 /* setting claim destination address */
1200 memcpy(&bat_priv
->bla
.claim_dest
.magic
, claim_dest
, 3);
1201 bat_priv
->bla
.claim_dest
.type
= 0;
1202 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1204 crc
= crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1205 bat_priv
->bla
.claim_dest
.group
= htons(crc
);
1206 batadv_hardif_free_ref(primary_if
);
1208 bat_priv
->bla
.claim_dest
.group
= 0; /* will be set later */
1211 /* initialize the duplicate list */
1212 entrytime
= jiffies
- msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT
);
1213 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++)
1214 bat_priv
->bla
.bcast_duplist
[i
].entrytime
= entrytime
;
1215 bat_priv
->bla
.bcast_duplist_curr
= 0;
1217 if (bat_priv
->bla
.claim_hash
)
1220 bat_priv
->bla
.claim_hash
= batadv_hash_new(128);
1221 bat_priv
->bla
.backbone_hash
= batadv_hash_new(32);
1223 if (!bat_priv
->bla
.claim_hash
|| !bat_priv
->bla
.backbone_hash
)
1226 batadv_hash_set_lock_class(bat_priv
->bla
.claim_hash
,
1227 &batadv_claim_hash_lock_class_key
);
1228 batadv_hash_set_lock_class(bat_priv
->bla
.backbone_hash
,
1229 &batadv_backbone_hash_lock_class_key
);
1231 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hashes initialized\n");
1233 INIT_DELAYED_WORK(&bat_priv
->bla
.work
, batadv_bla_periodic_work
);
1235 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1236 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1241 * batadv_bla_check_bcast_duplist
1242 * @bat_priv: the bat priv with all the soft interface information
1243 * @skb: contains the bcast_packet to be checked
1245 * check if it is on our broadcast list. Another gateway might
1246 * have sent the same packet because it is connected to the same backbone,
1247 * so we have to remove this duplicate.
1249 * This is performed by checking the CRC, which will tell us
1250 * with a good chance that it is the same packet. If it is furthermore
1251 * sent by another host, drop it. We allow equal packets from
1252 * the same host however as this might be intended.
1254 int batadv_bla_check_bcast_duplist(struct batadv_priv
*bat_priv
,
1255 struct sk_buff
*skb
)
1257 int i
, curr
, ret
= 0;
1259 struct batadv_bcast_packet
*bcast_packet
;
1260 struct batadv_bcast_duplist_entry
*entry
;
1262 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1264 /* calculate the crc ... */
1265 crc
= batadv_skb_crc32(skb
, (u8
*)(bcast_packet
+ 1));
1267 spin_lock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1269 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++) {
1270 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ i
);
1271 curr
%= BATADV_DUPLIST_SIZE
;
1272 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1274 /* we can stop searching if the entry is too old ;
1275 * later entries will be even older
1277 if (batadv_has_timed_out(entry
->entrytime
,
1278 BATADV_DUPLIST_TIMEOUT
))
1281 if (entry
->crc
!= crc
)
1284 if (batadv_compare_eth(entry
->orig
, bcast_packet
->orig
))
1287 /* this entry seems to match: same crc, not too old,
1288 * and from another gw. therefore return 1 to forbid it.
1293 /* not found, add a new entry (overwrite the oldest entry)
1294 * and allow it, its the first occurence.
1296 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ BATADV_DUPLIST_SIZE
- 1);
1297 curr
%= BATADV_DUPLIST_SIZE
;
1298 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1300 entry
->entrytime
= jiffies
;
1301 memcpy(entry
->orig
, bcast_packet
->orig
, ETH_ALEN
);
1302 bat_priv
->bla
.bcast_duplist_curr
= curr
;
1305 spin_unlock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1312 /* @bat_priv: the bat priv with all the soft interface information
1313 * @orig: originator mac address
1315 * check if the originator is a gateway for any VLAN ID.
1317 * returns 1 if it is found, 0 otherwise
1319 int batadv_bla_is_backbone_gw_orig(struct batadv_priv
*bat_priv
, uint8_t *orig
)
1321 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1322 struct hlist_head
*head
;
1323 struct batadv_bla_backbone_gw
*backbone_gw
;
1326 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1332 for (i
= 0; i
< hash
->size
; i
++) {
1333 head
= &hash
->table
[i
];
1336 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1337 if (batadv_compare_eth(backbone_gw
->orig
, orig
)) {
1350 * batadv_bla_is_backbone_gw
1351 * @skb: the frame to be checked
1352 * @orig_node: the orig_node of the frame
1353 * @hdr_size: maximum length of the frame
1355 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1356 * if the orig_node is also a gateway on the soft interface, otherwise it
1359 int batadv_bla_is_backbone_gw(struct sk_buff
*skb
,
1360 struct batadv_orig_node
*orig_node
, int hdr_size
)
1362 struct ethhdr
*ethhdr
;
1363 struct vlan_ethhdr
*vhdr
;
1364 struct batadv_bla_backbone_gw
*backbone_gw
;
1367 if (!atomic_read(&orig_node
->bat_priv
->bridge_loop_avoidance
))
1370 /* first, find out the vid. */
1371 if (!pskb_may_pull(skb
, hdr_size
+ ETH_HLEN
))
1374 ethhdr
= (struct ethhdr
*)(((uint8_t *)skb
->data
) + hdr_size
);
1376 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
1377 if (!pskb_may_pull(skb
, hdr_size
+ sizeof(struct vlan_ethhdr
)))
1380 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ hdr_size
);
1381 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1384 /* see if this originator is a backbone gw for this VLAN */
1385 backbone_gw
= batadv_backbone_hash_find(orig_node
->bat_priv
,
1386 orig_node
->orig
, vid
);
1390 batadv_backbone_gw_free_ref(backbone_gw
);
1394 /* free all bla structures (for softinterface free or module unload) */
1395 void batadv_bla_free(struct batadv_priv
*bat_priv
)
1397 struct batadv_hard_iface
*primary_if
;
1399 cancel_delayed_work_sync(&bat_priv
->bla
.work
);
1400 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1402 if (bat_priv
->bla
.claim_hash
) {
1403 batadv_bla_purge_claims(bat_priv
, primary_if
, 1);
1404 batadv_hash_destroy(bat_priv
->bla
.claim_hash
);
1405 bat_priv
->bla
.claim_hash
= NULL
;
1407 if (bat_priv
->bla
.backbone_hash
) {
1408 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1409 batadv_hash_destroy(bat_priv
->bla
.backbone_hash
);
1410 bat_priv
->bla
.backbone_hash
= NULL
;
1413 batadv_hardif_free_ref(primary_if
);
1418 * @bat_priv: the bat priv with all the soft interface information
1419 * @skb: the frame to be checked
1420 * @vid: the VLAN ID of the frame
1421 * @is_bcast: the packet came in a broadcast packet type.
1423 * bla_rx avoidance checks if:
1424 * * we have to race for a claim
1425 * * if the frame is allowed on the LAN
1427 * in these cases, the skb is further handled by this function and
1428 * returns 1, otherwise it returns 0 and the caller shall further
1431 int batadv_bla_rx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
,
1434 struct ethhdr
*ethhdr
;
1435 struct batadv_bla_claim search_claim
, *claim
= NULL
;
1436 struct batadv_hard_iface
*primary_if
;
1439 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1441 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1445 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1449 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1450 /* don't allow broadcasts while requests are in flight */
1451 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
)
1454 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1455 search_claim
.vid
= vid
;
1456 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1459 /* possible optimization: race for a claim */
1460 /* No claim exists yet, claim it for us!
1462 batadv_handle_claim(bat_priv
, primary_if
,
1463 primary_if
->net_dev
->dev_addr
,
1464 ethhdr
->h_source
, vid
);
1468 /* if it is our own claim ... */
1469 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1470 primary_if
->net_dev
->dev_addr
)) {
1471 /* ... allow it in any case */
1472 claim
->lasttime
= jiffies
;
1476 /* if it is a broadcast ... */
1477 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
) {
1478 /* ... drop it. the responsible gateway is in charge.
1480 * We need to check is_bcast because with the gateway
1481 * feature, broadcasts (like DHCP requests) may be sent
1482 * using a unicast packet type.
1486 /* seems the client considers us as its best gateway.
1487 * send a claim and update the claim table
1490 batadv_handle_claim(bat_priv
, primary_if
,
1491 primary_if
->net_dev
->dev_addr
,
1492 ethhdr
->h_source
, vid
);
1496 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1506 batadv_hardif_free_ref(primary_if
);
1508 batadv_claim_free_ref(claim
);
1514 * @bat_priv: the bat priv with all the soft interface information
1515 * @skb: the frame to be checked
1516 * @vid: the VLAN ID of the frame
1519 * * a claim was received which has to be processed
1520 * * the frame is allowed on the mesh
1522 * in these cases, the skb is further handled by this function and
1523 * returns 1, otherwise it returns 0 and the caller shall further
1526 int batadv_bla_tx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
)
1528 struct ethhdr
*ethhdr
;
1529 struct batadv_bla_claim search_claim
, *claim
= NULL
;
1530 struct batadv_hard_iface
*primary_if
;
1533 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1537 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1540 /* in VLAN case, the mac header might not be set. */
1541 skb_reset_mac_header(skb
);
1543 if (batadv_bla_process_claim(bat_priv
, primary_if
, skb
))
1546 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1548 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1549 /* don't allow broadcasts while requests are in flight */
1550 if (is_multicast_ether_addr(ethhdr
->h_dest
))
1553 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1554 search_claim
.vid
= vid
;
1556 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1558 /* if no claim exists, allow it. */
1562 /* check if we are responsible. */
1563 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1564 primary_if
->net_dev
->dev_addr
)) {
1565 /* if yes, the client has roamed and we have
1568 batadv_handle_unclaim(bat_priv
, primary_if
,
1569 primary_if
->net_dev
->dev_addr
,
1570 ethhdr
->h_source
, vid
);
1574 /* check if it is a multicast/broadcast frame */
1575 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
1576 /* drop it. the responsible gateway has forwarded it into
1577 * the backbone network.
1581 /* we must allow it. at least if we are
1582 * responsible for the DESTINATION.
1587 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1594 batadv_hardif_free_ref(primary_if
);
1596 batadv_claim_free_ref(claim
);
1600 int batadv_bla_claim_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1602 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1603 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1604 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
1605 struct batadv_bla_claim
*claim
;
1606 struct batadv_hard_iface
*primary_if
;
1607 struct hlist_head
*head
;
1610 uint8_t *primary_addr
;
1612 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1616 primary_addr
= primary_if
->net_dev
->dev_addr
;
1618 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1619 net_dev
->name
, primary_addr
,
1620 ntohs(bat_priv
->bla
.claim_dest
.group
));
1621 seq_printf(seq
, " %-17s %-5s %-17s [o] (%-6s)\n",
1622 "Client", "VID", "Originator", "CRC");
1623 for (i
= 0; i
< hash
->size
; i
++) {
1624 head
= &hash
->table
[i
];
1627 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
1628 is_own
= batadv_compare_eth(claim
->backbone_gw
->orig
,
1630 seq_printf(seq
, " * %pM on % 5d by %pM [%c] (%#.4x)\n",
1631 claim
->addr
, claim
->vid
,
1632 claim
->backbone_gw
->orig
,
1633 (is_own
? 'x' : ' '),
1634 claim
->backbone_gw
->crc
);
1640 batadv_hardif_free_ref(primary_if
);
1644 int batadv_bla_backbone_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1646 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1647 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1648 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1649 struct batadv_bla_backbone_gw
*backbone_gw
;
1650 struct batadv_hard_iface
*primary_if
;
1651 struct hlist_head
*head
;
1655 uint8_t *primary_addr
;
1657 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1661 primary_addr
= primary_if
->net_dev
->dev_addr
;
1663 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
1664 net_dev
->name
, primary_addr
,
1665 ntohs(bat_priv
->bla
.claim_dest
.group
));
1666 seq_printf(seq
, " %-17s %-5s %-9s (%-6s)\n",
1667 "Originator", "VID", "last seen", "CRC");
1668 for (i
= 0; i
< hash
->size
; i
++) {
1669 head
= &hash
->table
[i
];
1672 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1673 msecs
= jiffies_to_msecs(jiffies
-
1674 backbone_gw
->lasttime
);
1675 secs
= msecs
/ 1000;
1676 msecs
= msecs
% 1000;
1678 is_own
= batadv_compare_eth(backbone_gw
->orig
,
1684 " * %pM on % 5d % 4i.%03is (%#.4x)\n",
1685 backbone_gw
->orig
, backbone_gw
->vid
,
1686 secs
, msecs
, backbone_gw
->crc
);
1692 batadv_hardif_free_ref(primary_if
);