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 struct batadv_claim
*claim
= (struct batadv_claim
*)data
;
46 hash
= batadv_hash_bytes(hash
, &claim
->addr
, sizeof(claim
->addr
));
47 hash
= batadv_hash_bytes(hash
, &claim
->vid
, sizeof(claim
->vid
));
56 /* return the index of the backbone gateway */
57 static inline uint32_t batadv_choose_backbone_gw(const void *data
,
60 const struct batadv_claim
*claim
= (struct batadv_claim
*)data
;
63 hash
= batadv_hash_bytes(hash
, &claim
->addr
, sizeof(claim
->addr
));
64 hash
= batadv_hash_bytes(hash
, &claim
->vid
, sizeof(claim
->vid
));
74 /* compares address and vid of two backbone gws */
75 static int batadv_compare_backbone_gw(const struct hlist_node
*node
,
78 const void *data1
= container_of(node
, struct batadv_backbone_gw
,
80 const struct batadv_backbone_gw
*gw1
= data1
, *gw2
= data2
;
82 if (!batadv_compare_eth(gw1
->orig
, gw2
->orig
))
85 if (gw1
->vid
!= gw2
->vid
)
91 /* compares address and vid of two claims */
92 static int batadv_compare_claim(const struct hlist_node
*node
,
95 const void *data1
= container_of(node
, struct batadv_claim
,
97 const struct batadv_claim
*cl1
= data1
, *cl2
= data2
;
99 if (!batadv_compare_eth(cl1
->addr
, cl2
->addr
))
102 if (cl1
->vid
!= cl2
->vid
)
108 /* free a backbone gw */
109 static void batadv_backbone_gw_free_ref(struct batadv_backbone_gw
*backbone_gw
)
111 if (atomic_dec_and_test(&backbone_gw
->refcount
))
112 kfree_rcu(backbone_gw
, rcu
);
115 /* finally deinitialize the claim */
116 static void batadv_claim_free_rcu(struct rcu_head
*rcu
)
118 struct batadv_claim
*claim
;
120 claim
= container_of(rcu
, struct batadv_claim
, rcu
);
122 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
126 /* free a claim, call claim_free_rcu if its the last reference */
127 static void batadv_claim_free_ref(struct batadv_claim
*claim
)
129 if (atomic_dec_and_test(&claim
->refcount
))
130 call_rcu(&claim
->rcu
, batadv_claim_free_rcu
);
133 /* @bat_priv: the bat priv with all the soft interface information
134 * @data: search data (may be local/static data)
136 * looks for a claim in the hash, and returns it if found
139 static struct batadv_claim
*batadv_claim_hash_find(struct batadv_priv
*bat_priv
,
140 struct batadv_claim
*data
)
142 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
143 struct hlist_head
*head
;
144 struct hlist_node
*node
;
145 struct batadv_claim
*claim
;
146 struct batadv_claim
*claim_tmp
= NULL
;
152 index
= batadv_choose_claim(data
, hash
->size
);
153 head
= &hash
->table
[index
];
156 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
157 if (!batadv_compare_claim(&claim
->hash_entry
, data
))
160 if (!atomic_inc_not_zero(&claim
->refcount
))
172 * batadv_backbone_hash_find - looks for a claim in the hash
173 * @bat_priv: the bat priv with all the soft interface information
174 * @addr: the address of the originator
177 * Returns claim if found or NULL otherwise.
179 static struct batadv_backbone_gw
*
180 batadv_backbone_hash_find(struct batadv_priv
*bat_priv
,
181 uint8_t *addr
, short vid
)
183 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
184 struct hlist_head
*head
;
185 struct hlist_node
*node
;
186 struct batadv_backbone_gw search_entry
, *backbone_gw
;
187 struct batadv_backbone_gw
*backbone_gw_tmp
= NULL
;
193 memcpy(search_entry
.orig
, addr
, ETH_ALEN
);
194 search_entry
.vid
= vid
;
196 index
= batadv_choose_backbone_gw(&search_entry
, hash
->size
);
197 head
= &hash
->table
[index
];
200 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
201 if (!batadv_compare_backbone_gw(&backbone_gw
->hash_entry
,
205 if (!atomic_inc_not_zero(&backbone_gw
->refcount
))
208 backbone_gw_tmp
= backbone_gw
;
213 return backbone_gw_tmp
;
216 /* delete all claims for a backbone */
218 batadv_bla_del_backbone_claims(struct batadv_backbone_gw
*backbone_gw
)
220 struct batadv_hashtable
*hash
;
221 struct hlist_node
*node
, *node_tmp
;
222 struct hlist_head
*head
;
223 struct batadv_claim
*claim
;
225 spinlock_t
*list_lock
; /* protects write access to the hash lists */
227 hash
= backbone_gw
->bat_priv
->bla
.claim_hash
;
231 for (i
= 0; i
< hash
->size
; i
++) {
232 head
= &hash
->table
[i
];
233 list_lock
= &hash
->list_locks
[i
];
235 spin_lock_bh(list_lock
);
236 hlist_for_each_entry_safe(claim
, node
, node_tmp
,
238 if (claim
->backbone_gw
!= backbone_gw
)
241 batadv_claim_free_ref(claim
);
244 spin_unlock_bh(list_lock
);
247 /* all claims gone, intialize CRC */
248 backbone_gw
->crc
= BATADV_BLA_CRC_INIT
;
252 * batadv_bla_send_claim - sends a claim frame according to the provided info
253 * @bat_priv: the bat priv with all the soft interface information
254 * @orig: the mac address to be announced within the claim
256 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
258 static void batadv_bla_send_claim(struct batadv_priv
*bat_priv
, uint8_t *mac
,
259 short vid
, int claimtype
)
262 struct ethhdr
*ethhdr
;
263 struct batadv_hard_iface
*primary_if
;
264 struct net_device
*soft_iface
;
266 struct batadv_bla_claim_dst local_claim_dest
;
269 primary_if
= batadv_primary_if_get_selected(bat_priv
);
273 memcpy(&local_claim_dest
, &bat_priv
->bla
.claim_dest
,
274 sizeof(local_claim_dest
));
275 local_claim_dest
.type
= claimtype
;
277 soft_iface
= primary_if
->soft_iface
;
279 skb
= arp_create(ARPOP_REPLY
, ETH_P_ARP
,
280 /* IP DST: 0.0.0.0 */
282 primary_if
->soft_iface
,
283 /* IP SRC: 0.0.0.0 */
285 /* Ethernet DST: Broadcast */
287 /* Ethernet SRC/HW SRC: originator mac */
288 primary_if
->net_dev
->dev_addr
,
289 /* HW DST: FF:43:05:XX:YY:YY
290 * with XX = claim type
291 * and YY:YY = group id
293 (uint8_t *)&local_claim_dest
);
298 ethhdr
= (struct ethhdr
*)skb
->data
;
299 hw_src
= (uint8_t *)ethhdr
+ ETH_HLEN
+ sizeof(struct arphdr
);
301 /* now we pretend that the client would have sent this ... */
303 case BATADV_CLAIM_TYPE_CLAIM
:
304 /* normal claim frame
305 * set Ethernet SRC to the clients mac
307 memcpy(ethhdr
->h_source
, mac
, ETH_ALEN
);
308 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
309 "bla_send_claim(): CLAIM %pM on vid %d\n", mac
, vid
);
311 case BATADV_CLAIM_TYPE_UNCLAIM
:
313 * set HW SRC to the clients mac
315 memcpy(hw_src
, mac
, ETH_ALEN
);
316 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
317 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac
,
320 case BATADV_CLAIM_TYPE_ANNOUNCE
:
321 /* announcement frame
322 * set HW SRC to the special mac containg the crc
324 memcpy(hw_src
, mac
, ETH_ALEN
);
325 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
326 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
327 ethhdr
->h_source
, vid
);
329 case BATADV_CLAIM_TYPE_REQUEST
:
331 * set HW SRC and header destination to the receiving backbone
334 memcpy(hw_src
, mac
, ETH_ALEN
);
335 memcpy(ethhdr
->h_dest
, mac
, ETH_ALEN
);
336 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
337 "bla_send_claim(): REQUEST of %pM to %pMon vid %d\n",
338 ethhdr
->h_source
, ethhdr
->h_dest
, vid
);
343 skb
= vlan_insert_tag(skb
, vid
);
345 skb_reset_mac_header(skb
);
346 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
347 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
348 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
349 skb
->len
+ ETH_HLEN
);
350 soft_iface
->last_rx
= jiffies
;
355 batadv_hardif_free_ref(primary_if
);
359 * batadv_bla_get_backbone_gw
360 * @bat_priv: the bat priv with all the soft interface information
361 * @orig: the mac address of the originator
364 * searches for the backbone gw or creates a new one if it could not
367 static struct batadv_backbone_gw
*
368 batadv_bla_get_backbone_gw(struct batadv_priv
*bat_priv
, uint8_t *orig
,
369 short vid
, bool own_backbone
)
371 struct batadv_backbone_gw
*entry
;
372 struct batadv_orig_node
*orig_node
;
375 entry
= batadv_backbone_hash_find(bat_priv
, orig
, vid
);
380 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
381 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
384 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
389 entry
->lasttime
= jiffies
;
390 entry
->crc
= BATADV_BLA_CRC_INIT
;
391 entry
->bat_priv
= bat_priv
;
392 atomic_set(&entry
->request_sent
, 0);
393 atomic_set(&entry
->wait_periods
, 0);
394 memcpy(entry
->orig
, orig
, ETH_ALEN
);
396 /* one for the hash, one for returning */
397 atomic_set(&entry
->refcount
, 2);
399 hash_added
= batadv_hash_add(bat_priv
->bla
.backbone_hash
,
400 batadv_compare_backbone_gw
,
401 batadv_choose_backbone_gw
, entry
,
404 if (unlikely(hash_added
!= 0)) {
405 /* hash failed, free the structure */
410 /* this is a gateway now, remove any tt entries */
411 orig_node
= batadv_orig_hash_find(bat_priv
, orig
);
413 batadv_tt_global_del_orig(bat_priv
, orig_node
,
414 "became a backbone gateway");
415 batadv_orig_node_free_ref(orig_node
);
419 batadv_bla_send_announce(bat_priv
, entry
);
421 /* this will be decreased in the worker thread */
422 atomic_inc(&entry
->request_sent
);
423 atomic_set(&entry
->wait_periods
, BATADV_BLA_WAIT_PERIODS
);
424 atomic_inc(&bat_priv
->bla
.num_requests
);
430 /* update or add the own backbone gw to make sure we announce
431 * where we receive other backbone gws
434 batadv_bla_update_own_backbone_gw(struct batadv_priv
*bat_priv
,
435 struct batadv_hard_iface
*primary_if
,
438 struct batadv_backbone_gw
*backbone_gw
;
440 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
,
441 primary_if
->net_dev
->dev_addr
,
443 if (unlikely(!backbone_gw
))
446 backbone_gw
->lasttime
= jiffies
;
447 batadv_backbone_gw_free_ref(backbone_gw
);
450 /* @bat_priv: the bat priv with all the soft interface information
451 * @vid: the vid where the request came on
453 * Repeat all of our own claims, and finally send an ANNOUNCE frame
454 * to allow the requester another check if the CRC is correct now.
456 static void batadv_bla_answer_request(struct batadv_priv
*bat_priv
,
457 struct batadv_hard_iface
*primary_if
,
460 struct hlist_node
*node
;
461 struct hlist_head
*head
;
462 struct batadv_hashtable
*hash
;
463 struct batadv_claim
*claim
;
464 struct batadv_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
, node
, 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_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_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_backbone_gw
*backbone_gw
)
553 struct batadv_claim
*claim
;
554 struct batadv_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_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_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_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_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_backbone_gw
*backbone_gw
;
958 struct hlist_node
*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
, 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
);
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_claim
*claim
;
1013 struct hlist_node
*node
;
1014 struct hlist_head
*head
;
1015 struct batadv_hashtable
*hash
;
1018 hash
= bat_priv
->bla
.claim_hash
;
1022 for (i
= 0; i
< hash
->size
; i
++) {
1023 head
= &hash
->table
[i
];
1026 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1029 if (!batadv_compare_eth(claim
->backbone_gw
->orig
,
1030 primary_if
->net_dev
->dev_addr
))
1032 if (!batadv_has_timed_out(claim
->lasttime
,
1033 BATADV_BLA_CLAIM_TIMEOUT
))
1036 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1037 "bla_purge_claims(): %pM, vid %d, time out\n",
1038 claim
->addr
, claim
->vid
);
1041 batadv_handle_unclaim(bat_priv
, primary_if
,
1042 claim
->backbone_gw
->orig
,
1043 claim
->addr
, claim
->vid
);
1050 * batadv_bla_update_orig_address
1051 * @bat_priv: the bat priv with all the soft interface information
1052 * @primary_if: the new selected primary_if
1053 * @oldif: the old primary interface, may be NULL
1055 * Update the backbone gateways when the own orig address changes.
1057 void batadv_bla_update_orig_address(struct batadv_priv
*bat_priv
,
1058 struct batadv_hard_iface
*primary_if
,
1059 struct batadv_hard_iface
*oldif
)
1061 struct batadv_backbone_gw
*backbone_gw
;
1062 struct hlist_node
*node
;
1063 struct hlist_head
*head
;
1064 struct batadv_hashtable
*hash
;
1068 /* reset bridge loop avoidance group id */
1069 group
= htons(crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
));
1070 bat_priv
->bla
.claim_dest
.group
= group
;
1073 batadv_bla_purge_claims(bat_priv
, NULL
, 1);
1074 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1078 hash
= bat_priv
->bla
.backbone_hash
;
1082 for (i
= 0; i
< hash
->size
; i
++) {
1083 head
= &hash
->table
[i
];
1086 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1087 /* own orig still holds the old value. */
1088 if (!batadv_compare_eth(backbone_gw
->orig
,
1089 oldif
->net_dev
->dev_addr
))
1092 memcpy(backbone_gw
->orig
,
1093 primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1094 /* send an announce frame so others will ask for our
1095 * claims and update their tables.
1097 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1105 /* (re)start the timer */
1106 static void batadv_bla_start_timer(struct batadv_priv
*bat_priv
)
1108 INIT_DELAYED_WORK(&bat_priv
->bla
.work
, batadv_bla_periodic_work
);
1109 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1110 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1113 /* periodic work to do:
1114 * * purge structures when they are too old
1115 * * send announcements
1117 static void batadv_bla_periodic_work(struct work_struct
*work
)
1119 struct delayed_work
*delayed_work
;
1120 struct batadv_priv
*bat_priv
;
1121 struct batadv_priv_bla
*priv_bla
;
1122 struct hlist_node
*node
;
1123 struct hlist_head
*head
;
1124 struct batadv_backbone_gw
*backbone_gw
;
1125 struct batadv_hashtable
*hash
;
1126 struct batadv_hard_iface
*primary_if
;
1129 delayed_work
= container_of(work
, struct delayed_work
, work
);
1130 priv_bla
= container_of(delayed_work
, struct batadv_priv_bla
, work
);
1131 bat_priv
= container_of(priv_bla
, struct batadv_priv
, bla
);
1132 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1136 batadv_bla_purge_claims(bat_priv
, primary_if
, 0);
1137 batadv_bla_purge_backbone_gw(bat_priv
, 0);
1139 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1142 hash
= bat_priv
->bla
.backbone_hash
;
1146 for (i
= 0; i
< hash
->size
; i
++) {
1147 head
= &hash
->table
[i
];
1150 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1151 if (!batadv_compare_eth(backbone_gw
->orig
,
1152 primary_if
->net_dev
->dev_addr
))
1155 backbone_gw
->lasttime
= jiffies
;
1157 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1159 /* request_sent is only set after creation to avoid
1160 * problems when we are not yet known as backbone gw
1163 * We can reset this now after we waited some periods
1164 * to give bridge forward delays and bla group forming
1168 if (atomic_read(&backbone_gw
->request_sent
) == 0)
1171 if (!atomic_dec_and_test(&backbone_gw
->wait_periods
))
1174 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
1175 atomic_set(&backbone_gw
->request_sent
, 0);
1181 batadv_hardif_free_ref(primary_if
);
1183 batadv_bla_start_timer(bat_priv
);
1186 /* The hash for claim and backbone hash receive the same key because they
1187 * are getting initialized by hash_new with the same key. Reinitializing
1188 * them with to different keys to allow nested locking without generating
1191 static struct lock_class_key batadv_claim_hash_lock_class_key
;
1192 static struct lock_class_key batadv_backbone_hash_lock_class_key
;
1194 /* initialize all bla structures */
1195 int batadv_bla_init(struct batadv_priv
*bat_priv
)
1198 uint8_t claim_dest
[ETH_ALEN
] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1199 struct batadv_hard_iface
*primary_if
;
1201 unsigned long entrytime
;
1203 spin_lock_init(&bat_priv
->bla
.bcast_duplist_lock
);
1205 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hash registering\n");
1207 /* setting claim destination address */
1208 memcpy(&bat_priv
->bla
.claim_dest
.magic
, claim_dest
, 3);
1209 bat_priv
->bla
.claim_dest
.type
= 0;
1210 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1212 crc
= crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1213 bat_priv
->bla
.claim_dest
.group
= htons(crc
);
1214 batadv_hardif_free_ref(primary_if
);
1216 bat_priv
->bla
.claim_dest
.group
= 0; /* will be set later */
1219 /* initialize the duplicate list */
1220 entrytime
= jiffies
- msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT
);
1221 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++)
1222 bat_priv
->bla
.bcast_duplist
[i
].entrytime
= entrytime
;
1223 bat_priv
->bla
.bcast_duplist_curr
= 0;
1225 if (bat_priv
->bla
.claim_hash
)
1228 bat_priv
->bla
.claim_hash
= batadv_hash_new(128);
1229 bat_priv
->bla
.backbone_hash
= batadv_hash_new(32);
1231 if (!bat_priv
->bla
.claim_hash
|| !bat_priv
->bla
.backbone_hash
)
1234 batadv_hash_set_lock_class(bat_priv
->bla
.claim_hash
,
1235 &batadv_claim_hash_lock_class_key
);
1236 batadv_hash_set_lock_class(bat_priv
->bla
.backbone_hash
,
1237 &batadv_backbone_hash_lock_class_key
);
1239 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hashes initialized\n");
1241 batadv_bla_start_timer(bat_priv
);
1246 * batadv_bla_check_bcast_duplist
1247 * @bat_priv: the bat priv with all the soft interface information
1248 * @skb: contains the bcast_packet to be checked
1250 * check if it is on our broadcast list. Another gateway might
1251 * have sent the same packet because it is connected to the same backbone,
1252 * so we have to remove this duplicate.
1254 * This is performed by checking the CRC, which will tell us
1255 * with a good chance that it is the same packet. If it is furthermore
1256 * sent by another host, drop it. We allow equal packets from
1257 * the same host however as this might be intended.
1259 int batadv_bla_check_bcast_duplist(struct batadv_priv
*bat_priv
,
1260 struct sk_buff
*skb
)
1262 int i
, curr
, ret
= 0;
1264 struct batadv_bcast_packet
*bcast_packet
;
1265 struct batadv_bcast_duplist_entry
*entry
;
1267 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1269 /* calculate the crc ... */
1270 crc
= batadv_skb_crc32(skb
, (u8
*)(bcast_packet
+ 1));
1272 spin_lock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1274 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++) {
1275 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ i
);
1276 curr
%= BATADV_DUPLIST_SIZE
;
1277 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1279 /* we can stop searching if the entry is too old ;
1280 * later entries will be even older
1282 if (batadv_has_timed_out(entry
->entrytime
,
1283 BATADV_DUPLIST_TIMEOUT
))
1286 if (entry
->crc
!= crc
)
1289 if (batadv_compare_eth(entry
->orig
, bcast_packet
->orig
))
1292 /* this entry seems to match: same crc, not too old,
1293 * and from another gw. therefore return 1 to forbid it.
1298 /* not found, add a new entry (overwrite the oldest entry)
1299 * and allow it, its the first occurence.
1301 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ BATADV_DUPLIST_SIZE
- 1);
1302 curr
%= BATADV_DUPLIST_SIZE
;
1303 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1305 entry
->entrytime
= jiffies
;
1306 memcpy(entry
->orig
, bcast_packet
->orig
, ETH_ALEN
);
1307 bat_priv
->bla
.bcast_duplist_curr
= curr
;
1310 spin_unlock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1317 /* @bat_priv: the bat priv with all the soft interface information
1318 * @orig: originator mac address
1320 * check if the originator is a gateway for any VLAN ID.
1322 * returns 1 if it is found, 0 otherwise
1324 int batadv_bla_is_backbone_gw_orig(struct batadv_priv
*bat_priv
, uint8_t *orig
)
1326 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1327 struct hlist_head
*head
;
1328 struct hlist_node
*node
;
1329 struct batadv_backbone_gw
*backbone_gw
;
1332 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1338 for (i
= 0; i
< hash
->size
; i
++) {
1339 head
= &hash
->table
[i
];
1342 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1343 if (batadv_compare_eth(backbone_gw
->orig
, orig
)) {
1356 * batadv_bla_is_backbone_gw
1357 * @skb: the frame to be checked
1358 * @orig_node: the orig_node of the frame
1359 * @hdr_size: maximum length of the frame
1361 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1362 * if the orig_node is also a gateway on the soft interface, otherwise it
1365 int batadv_bla_is_backbone_gw(struct sk_buff
*skb
,
1366 struct batadv_orig_node
*orig_node
, int hdr_size
)
1368 struct ethhdr
*ethhdr
;
1369 struct vlan_ethhdr
*vhdr
;
1370 struct batadv_backbone_gw
*backbone_gw
;
1373 if (!atomic_read(&orig_node
->bat_priv
->bridge_loop_avoidance
))
1376 /* first, find out the vid. */
1377 if (!pskb_may_pull(skb
, hdr_size
+ ETH_HLEN
))
1380 ethhdr
= (struct ethhdr
*)(((uint8_t *)skb
->data
) + hdr_size
);
1382 if (ntohs(ethhdr
->h_proto
) == ETH_P_8021Q
) {
1383 if (!pskb_may_pull(skb
, hdr_size
+ sizeof(struct vlan_ethhdr
)))
1386 vhdr
= (struct vlan_ethhdr
*)(skb
->data
+ hdr_size
);
1387 vid
= ntohs(vhdr
->h_vlan_TCI
) & VLAN_VID_MASK
;
1390 /* see if this originator is a backbone gw for this VLAN */
1391 backbone_gw
= batadv_backbone_hash_find(orig_node
->bat_priv
,
1392 orig_node
->orig
, vid
);
1396 batadv_backbone_gw_free_ref(backbone_gw
);
1400 /* free all bla structures (for softinterface free or module unload) */
1401 void batadv_bla_free(struct batadv_priv
*bat_priv
)
1403 struct batadv_hard_iface
*primary_if
;
1405 cancel_delayed_work_sync(&bat_priv
->bla
.work
);
1406 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1408 if (bat_priv
->bla
.claim_hash
) {
1409 batadv_bla_purge_claims(bat_priv
, primary_if
, 1);
1410 batadv_hash_destroy(bat_priv
->bla
.claim_hash
);
1411 bat_priv
->bla
.claim_hash
= NULL
;
1413 if (bat_priv
->bla
.backbone_hash
) {
1414 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1415 batadv_hash_destroy(bat_priv
->bla
.backbone_hash
);
1416 bat_priv
->bla
.backbone_hash
= NULL
;
1419 batadv_hardif_free_ref(primary_if
);
1424 * @bat_priv: the bat priv with all the soft interface information
1425 * @skb: the frame to be checked
1426 * @vid: the VLAN ID of the frame
1427 * @is_bcast: the packet came in a broadcast packet type.
1429 * bla_rx avoidance checks if:
1430 * * we have to race for a claim
1431 * * if the frame is allowed on the LAN
1433 * in these cases, the skb is further handled by this function and
1434 * returns 1, otherwise it returns 0 and the caller shall further
1437 int batadv_bla_rx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
,
1440 struct ethhdr
*ethhdr
;
1441 struct batadv_claim search_claim
, *claim
= NULL
;
1442 struct batadv_hard_iface
*primary_if
;
1445 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1447 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1451 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1455 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1456 /* don't allow broadcasts while requests are in flight */
1457 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
)
1460 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1461 search_claim
.vid
= vid
;
1462 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1465 /* possible optimization: race for a claim */
1466 /* No claim exists yet, claim it for us!
1468 batadv_handle_claim(bat_priv
, primary_if
,
1469 primary_if
->net_dev
->dev_addr
,
1470 ethhdr
->h_source
, vid
);
1474 /* if it is our own claim ... */
1475 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1476 primary_if
->net_dev
->dev_addr
)) {
1477 /* ... allow it in any case */
1478 claim
->lasttime
= jiffies
;
1482 /* if it is a broadcast ... */
1483 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
) {
1484 /* ... drop it. the responsible gateway is in charge.
1486 * We need to check is_bcast because with the gateway
1487 * feature, broadcasts (like DHCP requests) may be sent
1488 * using a unicast packet type.
1492 /* seems the client considers us as its best gateway.
1493 * send a claim and update the claim table
1496 batadv_handle_claim(bat_priv
, primary_if
,
1497 primary_if
->net_dev
->dev_addr
,
1498 ethhdr
->h_source
, vid
);
1502 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1512 batadv_hardif_free_ref(primary_if
);
1514 batadv_claim_free_ref(claim
);
1520 * @bat_priv: the bat priv with all the soft interface information
1521 * @skb: the frame to be checked
1522 * @vid: the VLAN ID of the frame
1525 * * a claim was received which has to be processed
1526 * * the frame is allowed on the mesh
1528 * in these cases, the skb is further handled by this function and
1529 * returns 1, otherwise it returns 0 and the caller shall further
1532 int batadv_bla_tx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
, short vid
)
1534 struct ethhdr
*ethhdr
;
1535 struct batadv_claim search_claim
, *claim
= NULL
;
1536 struct batadv_hard_iface
*primary_if
;
1539 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1543 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1546 /* in VLAN case, the mac header might not be set. */
1547 skb_reset_mac_header(skb
);
1549 if (batadv_bla_process_claim(bat_priv
, primary_if
, skb
))
1552 ethhdr
= (struct ethhdr
*)skb_mac_header(skb
);
1554 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1555 /* don't allow broadcasts while requests are in flight */
1556 if (is_multicast_ether_addr(ethhdr
->h_dest
))
1559 memcpy(search_claim
.addr
, ethhdr
->h_source
, ETH_ALEN
);
1560 search_claim
.vid
= vid
;
1562 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1564 /* if no claim exists, allow it. */
1568 /* check if we are responsible. */
1569 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1570 primary_if
->net_dev
->dev_addr
)) {
1571 /* if yes, the client has roamed and we have
1574 batadv_handle_unclaim(bat_priv
, primary_if
,
1575 primary_if
->net_dev
->dev_addr
,
1576 ethhdr
->h_source
, vid
);
1580 /* check if it is a multicast/broadcast frame */
1581 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
1582 /* drop it. the responsible gateway has forwarded it into
1583 * the backbone network.
1587 /* we must allow it. at least if we are
1588 * responsible for the DESTINATION.
1593 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1600 batadv_hardif_free_ref(primary_if
);
1602 batadv_claim_free_ref(claim
);
1606 int batadv_bla_claim_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1608 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1609 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1610 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
1611 struct batadv_claim
*claim
;
1612 struct batadv_hard_iface
*primary_if
;
1613 struct hlist_node
*node
;
1614 struct hlist_head
*head
;
1617 uint8_t *primary_addr
;
1619 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1623 primary_addr
= primary_if
->net_dev
->dev_addr
;
1625 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1626 net_dev
->name
, primary_addr
,
1627 ntohs(bat_priv
->bla
.claim_dest
.group
));
1628 seq_printf(seq
, " %-17s %-5s %-17s [o] (%-6s)\n",
1629 "Client", "VID", "Originator", "CRC");
1630 for (i
= 0; i
< hash
->size
; i
++) {
1631 head
= &hash
->table
[i
];
1634 hlist_for_each_entry_rcu(claim
, node
, head
, hash_entry
) {
1635 is_own
= batadv_compare_eth(claim
->backbone_gw
->orig
,
1637 seq_printf(seq
, " * %pM on % 5d by %pM [%c] (%#.4x)\n",
1638 claim
->addr
, claim
->vid
,
1639 claim
->backbone_gw
->orig
,
1640 (is_own
? 'x' : ' '),
1641 claim
->backbone_gw
->crc
);
1647 batadv_hardif_free_ref(primary_if
);
1651 int batadv_bla_backbone_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1653 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1654 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1655 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1656 struct batadv_backbone_gw
*backbone_gw
;
1657 struct batadv_hard_iface
*primary_if
;
1658 struct hlist_node
*node
;
1659 struct hlist_head
*head
;
1663 uint8_t *primary_addr
;
1665 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1669 primary_addr
= primary_if
->net_dev
->dev_addr
;
1671 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
1672 net_dev
->name
, primary_addr
,
1673 ntohs(bat_priv
->bla
.claim_dest
.group
));
1674 seq_printf(seq
, " %-17s %-5s %-9s (%-6s)\n",
1675 "Originator", "VID", "last seen", "CRC");
1676 for (i
= 0; i
< hash
->size
; i
++) {
1677 head
= &hash
->table
[i
];
1680 hlist_for_each_entry_rcu(backbone_gw
, node
, head
, hash_entry
) {
1681 msecs
= jiffies_to_msecs(jiffies
-
1682 backbone_gw
->lasttime
);
1683 secs
= msecs
/ 1000;
1684 msecs
= msecs
% 1000;
1686 is_own
= batadv_compare_eth(backbone_gw
->orig
,
1692 " * %pM on % 5d % 4i.%03is (%#.4x)\n",
1693 backbone_gw
->orig
, backbone_gw
->vid
,
1694 secs
, msecs
, backbone_gw
->crc
);
1700 batadv_hardif_free_ref(primary_if
);