1 /* Copyright (C) 2011-2015 B.A.T.M.A.N. contributors:
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 #include "bridge_loop_avoidance.h"
21 #include <linux/atomic.h>
22 #include <linux/byteorder/generic.h>
23 #include <linux/compiler.h>
24 #include <linux/crc16.h>
25 #include <linux/errno.h>
26 #include <linux/etherdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_ether.h>
30 #include <linux/if_vlan.h>
31 #include <linux/jhash.h>
32 #include <linux/jiffies.h>
33 #include <linux/kernel.h>
34 #include <linux/list.h>
35 #include <linux/lockdep.h>
36 #include <linux/netdevice.h>
37 #include <linux/rculist.h>
38 #include <linux/rcupdate.h>
39 #include <linux/seq_file.h>
40 #include <linux/skbuff.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/stddef.h>
44 #include <linux/string.h>
45 #include <linux/workqueue.h>
48 #include "hard-interface.h"
50 #include "originator.h"
52 #include "translation-table.h"
54 static const u8 batadv_announce_mac
[4] = {0x43, 0x05, 0x43, 0x05};
56 static void batadv_bla_periodic_work(struct work_struct
*work
);
58 batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
59 struct batadv_bla_backbone_gw
*backbone_gw
);
61 /* return the index of the claim */
62 static inline u32
batadv_choose_claim(const void *data
, u32 size
)
64 struct batadv_bla_claim
*claim
= (struct batadv_bla_claim
*)data
;
67 hash
= jhash(&claim
->addr
, sizeof(claim
->addr
), hash
);
68 hash
= jhash(&claim
->vid
, sizeof(claim
->vid
), hash
);
73 /* return the index of the backbone gateway */
74 static inline u32
batadv_choose_backbone_gw(const void *data
, u32 size
)
76 const struct batadv_bla_claim
*claim
= (struct batadv_bla_claim
*)data
;
79 hash
= jhash(&claim
->addr
, sizeof(claim
->addr
), hash
);
80 hash
= jhash(&claim
->vid
, sizeof(claim
->vid
), hash
);
85 /* compares address and vid of two backbone gws */
86 static int batadv_compare_backbone_gw(const struct hlist_node
*node
,
89 const void *data1
= container_of(node
, struct batadv_bla_backbone_gw
,
91 const struct batadv_bla_backbone_gw
*gw1
= data1
;
92 const struct batadv_bla_backbone_gw
*gw2
= data2
;
94 if (!batadv_compare_eth(gw1
->orig
, gw2
->orig
))
97 if (gw1
->vid
!= gw2
->vid
)
103 /* compares address and vid of two claims */
104 static int batadv_compare_claim(const struct hlist_node
*node
,
107 const void *data1
= container_of(node
, struct batadv_bla_claim
,
109 const struct batadv_bla_claim
*cl1
= data1
;
110 const struct batadv_bla_claim
*cl2
= data2
;
112 if (!batadv_compare_eth(cl1
->addr
, cl2
->addr
))
115 if (cl1
->vid
!= cl2
->vid
)
121 /* free a backbone gw */
123 batadv_backbone_gw_free_ref(struct batadv_bla_backbone_gw
*backbone_gw
)
125 if (atomic_dec_and_test(&backbone_gw
->refcount
))
126 kfree_rcu(backbone_gw
, rcu
);
129 /* finally deinitialize the claim */
130 static void batadv_claim_free_rcu(struct rcu_head
*rcu
)
132 struct batadv_bla_claim
*claim
;
134 claim
= container_of(rcu
, struct batadv_bla_claim
, rcu
);
136 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
140 /* free a claim, call claim_free_rcu if its the last reference */
141 static void batadv_claim_free_ref(struct batadv_bla_claim
*claim
)
143 if (atomic_dec_and_test(&claim
->refcount
))
144 call_rcu(&claim
->rcu
, batadv_claim_free_rcu
);
148 * batadv_claim_hash_find
149 * @bat_priv: the bat priv with all the soft interface information
150 * @data: search data (may be local/static data)
152 * looks for a claim in the hash, and returns it if found
155 static struct batadv_bla_claim
156 *batadv_claim_hash_find(struct batadv_priv
*bat_priv
,
157 struct batadv_bla_claim
*data
)
159 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
160 struct hlist_head
*head
;
161 struct batadv_bla_claim
*claim
;
162 struct batadv_bla_claim
*claim_tmp
= NULL
;
168 index
= batadv_choose_claim(data
, hash
->size
);
169 head
= &hash
->table
[index
];
172 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
173 if (!batadv_compare_claim(&claim
->hash_entry
, data
))
176 if (!atomic_inc_not_zero(&claim
->refcount
))
188 * batadv_backbone_hash_find - looks for a claim in the hash
189 * @bat_priv: the bat priv with all the soft interface information
190 * @addr: the address of the originator
193 * Returns claim if found or NULL otherwise.
195 static struct batadv_bla_backbone_gw
*
196 batadv_backbone_hash_find(struct batadv_priv
*bat_priv
, u8
*addr
,
199 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
200 struct hlist_head
*head
;
201 struct batadv_bla_backbone_gw search_entry
, *backbone_gw
;
202 struct batadv_bla_backbone_gw
*backbone_gw_tmp
= NULL
;
208 ether_addr_copy(search_entry
.orig
, addr
);
209 search_entry
.vid
= vid
;
211 index
= batadv_choose_backbone_gw(&search_entry
, hash
->size
);
212 head
= &hash
->table
[index
];
215 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
216 if (!batadv_compare_backbone_gw(&backbone_gw
->hash_entry
,
220 if (!atomic_inc_not_zero(&backbone_gw
->refcount
))
223 backbone_gw_tmp
= backbone_gw
;
228 return backbone_gw_tmp
;
231 /* delete all claims for a backbone */
233 batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw
*backbone_gw
)
235 struct batadv_hashtable
*hash
;
236 struct hlist_node
*node_tmp
;
237 struct hlist_head
*head
;
238 struct batadv_bla_claim
*claim
;
240 spinlock_t
*list_lock
; /* protects write access to the hash lists */
242 hash
= backbone_gw
->bat_priv
->bla
.claim_hash
;
246 for (i
= 0; i
< hash
->size
; i
++) {
247 head
= &hash
->table
[i
];
248 list_lock
= &hash
->list_locks
[i
];
250 spin_lock_bh(list_lock
);
251 hlist_for_each_entry_safe(claim
, node_tmp
,
253 if (claim
->backbone_gw
!= backbone_gw
)
256 batadv_claim_free_ref(claim
);
257 hlist_del_rcu(&claim
->hash_entry
);
259 spin_unlock_bh(list_lock
);
262 /* all claims gone, initialize CRC */
263 spin_lock_bh(&backbone_gw
->crc_lock
);
264 backbone_gw
->crc
= BATADV_BLA_CRC_INIT
;
265 spin_unlock_bh(&backbone_gw
->crc_lock
);
269 * batadv_bla_send_claim - sends a claim frame according to the provided info
270 * @bat_priv: the bat priv with all the soft interface information
271 * @mac: the mac address to be announced within the claim
273 * @claimtype: the type of the claim (CLAIM, UNCLAIM, ANNOUNCE, ...)
275 static void batadv_bla_send_claim(struct batadv_priv
*bat_priv
, u8
*mac
,
276 unsigned short vid
, int claimtype
)
279 struct ethhdr
*ethhdr
;
280 struct batadv_hard_iface
*primary_if
;
281 struct net_device
*soft_iface
;
283 struct batadv_bla_claim_dst local_claim_dest
;
286 primary_if
= batadv_primary_if_get_selected(bat_priv
);
290 memcpy(&local_claim_dest
, &bat_priv
->bla
.claim_dest
,
291 sizeof(local_claim_dest
));
292 local_claim_dest
.type
= claimtype
;
294 soft_iface
= primary_if
->soft_iface
;
296 skb
= arp_create(ARPOP_REPLY
, ETH_P_ARP
,
297 /* IP DST: 0.0.0.0 */
299 primary_if
->soft_iface
,
300 /* IP SRC: 0.0.0.0 */
302 /* Ethernet DST: Broadcast */
304 /* Ethernet SRC/HW SRC: originator mac */
305 primary_if
->net_dev
->dev_addr
,
306 /* HW DST: FF:43:05:XX:YY:YY
307 * with XX = claim type
308 * and YY:YY = group id
310 (u8
*)&local_claim_dest
);
315 ethhdr
= (struct ethhdr
*)skb
->data
;
316 hw_src
= (u8
*)ethhdr
+ ETH_HLEN
+ sizeof(struct arphdr
);
318 /* now we pretend that the client would have sent this ... */
320 case BATADV_CLAIM_TYPE_CLAIM
:
321 /* normal claim frame
322 * set Ethernet SRC to the clients mac
324 ether_addr_copy(ethhdr
->h_source
, mac
);
325 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
326 "bla_send_claim(): CLAIM %pM on vid %d\n", mac
,
327 BATADV_PRINT_VID(vid
));
329 case BATADV_CLAIM_TYPE_UNCLAIM
:
331 * set HW SRC to the clients mac
333 ether_addr_copy(hw_src
, mac
);
334 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
335 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac
,
336 BATADV_PRINT_VID(vid
));
338 case BATADV_CLAIM_TYPE_ANNOUNCE
:
339 /* announcement frame
340 * set HW SRC to the special mac containg the crc
342 ether_addr_copy(hw_src
, mac
);
343 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
344 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
345 ethhdr
->h_source
, BATADV_PRINT_VID(vid
));
347 case BATADV_CLAIM_TYPE_REQUEST
:
349 * set HW SRC and header destination to the receiving backbone
352 ether_addr_copy(hw_src
, mac
);
353 ether_addr_copy(ethhdr
->h_dest
, mac
);
354 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
355 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
356 ethhdr
->h_source
, ethhdr
->h_dest
,
357 BATADV_PRINT_VID(vid
));
361 if (vid
& BATADV_VLAN_HAS_TAG
)
362 skb
= vlan_insert_tag(skb
, htons(ETH_P_8021Q
),
363 vid
& VLAN_VID_MASK
);
365 skb_reset_mac_header(skb
);
366 skb
->protocol
= eth_type_trans(skb
, soft_iface
);
367 batadv_inc_counter(bat_priv
, BATADV_CNT_RX
);
368 batadv_add_counter(bat_priv
, BATADV_CNT_RX_BYTES
,
369 skb
->len
+ ETH_HLEN
);
370 soft_iface
->last_rx
= jiffies
;
375 batadv_hardif_free_ref(primary_if
);
379 * batadv_bla_get_backbone_gw
380 * @bat_priv: the bat priv with all the soft interface information
381 * @orig: the mac address of the originator
383 * @own_backbone: set if the requested backbone is local
385 * searches for the backbone gw or creates a new one if it could not
388 static struct batadv_bla_backbone_gw
*
389 batadv_bla_get_backbone_gw(struct batadv_priv
*bat_priv
, u8
*orig
,
390 unsigned short vid
, bool own_backbone
)
392 struct batadv_bla_backbone_gw
*entry
;
393 struct batadv_orig_node
*orig_node
;
396 entry
= batadv_backbone_hash_find(bat_priv
, orig
, vid
);
401 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
402 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
403 orig
, BATADV_PRINT_VID(vid
));
405 entry
= kzalloc(sizeof(*entry
), GFP_ATOMIC
);
410 entry
->lasttime
= jiffies
;
411 entry
->crc
= BATADV_BLA_CRC_INIT
;
412 entry
->bat_priv
= bat_priv
;
413 spin_lock_init(&entry
->crc_lock
);
414 atomic_set(&entry
->request_sent
, 0);
415 atomic_set(&entry
->wait_periods
, 0);
416 ether_addr_copy(entry
->orig
, orig
);
418 /* one for the hash, one for returning */
419 atomic_set(&entry
->refcount
, 2);
421 hash_added
= batadv_hash_add(bat_priv
->bla
.backbone_hash
,
422 batadv_compare_backbone_gw
,
423 batadv_choose_backbone_gw
, entry
,
426 if (unlikely(hash_added
!= 0)) {
427 /* hash failed, free the structure */
432 /* this is a gateway now, remove any TT entry on this VLAN */
433 orig_node
= batadv_orig_hash_find(bat_priv
, orig
);
435 batadv_tt_global_del_orig(bat_priv
, orig_node
, vid
,
436 "became a backbone gateway");
437 batadv_orig_node_free_ref(orig_node
);
441 batadv_bla_send_announce(bat_priv
, entry
);
443 /* this will be decreased in the worker thread */
444 atomic_inc(&entry
->request_sent
);
445 atomic_set(&entry
->wait_periods
, BATADV_BLA_WAIT_PERIODS
);
446 atomic_inc(&bat_priv
->bla
.num_requests
);
452 /* update or add the own backbone gw to make sure we announce
453 * where we receive other backbone gws
456 batadv_bla_update_own_backbone_gw(struct batadv_priv
*bat_priv
,
457 struct batadv_hard_iface
*primary_if
,
460 struct batadv_bla_backbone_gw
*backbone_gw
;
462 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
,
463 primary_if
->net_dev
->dev_addr
,
465 if (unlikely(!backbone_gw
))
468 backbone_gw
->lasttime
= jiffies
;
469 batadv_backbone_gw_free_ref(backbone_gw
);
473 * batadv_bla_answer_request - answer a bla request by sending own claims
474 * @bat_priv: the bat priv with all the soft interface information
475 * @primary_if: interface where the request came on
476 * @vid: the vid where the request came on
478 * Repeat all of our own claims, and finally send an ANNOUNCE frame
479 * to allow the requester another check if the CRC is correct now.
481 static void batadv_bla_answer_request(struct batadv_priv
*bat_priv
,
482 struct batadv_hard_iface
*primary_if
,
485 struct hlist_head
*head
;
486 struct batadv_hashtable
*hash
;
487 struct batadv_bla_claim
*claim
;
488 struct batadv_bla_backbone_gw
*backbone_gw
;
491 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
492 "bla_answer_request(): received a claim request, send all of our own claims again\n");
494 backbone_gw
= batadv_backbone_hash_find(bat_priv
,
495 primary_if
->net_dev
->dev_addr
,
500 hash
= bat_priv
->bla
.claim_hash
;
501 for (i
= 0; i
< hash
->size
; i
++) {
502 head
= &hash
->table
[i
];
505 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
506 /* only own claims are interesting */
507 if (claim
->backbone_gw
!= backbone_gw
)
510 batadv_bla_send_claim(bat_priv
, claim
->addr
, claim
->vid
,
511 BATADV_CLAIM_TYPE_CLAIM
);
516 /* finally, send an announcement frame */
517 batadv_bla_send_announce(bat_priv
, backbone_gw
);
518 batadv_backbone_gw_free_ref(backbone_gw
);
522 * batadv_bla_send_request - send a request to repeat claims
523 * @backbone_gw: the backbone gateway from whom we are out of sync
525 * When the crc is wrong, ask the backbone gateway for a full table update.
526 * After the request, it will repeat all of his own claims and finally
527 * send an announcement claim with which we can check again.
529 static void batadv_bla_send_request(struct batadv_bla_backbone_gw
*backbone_gw
)
531 /* first, remove all old entries */
532 batadv_bla_del_backbone_claims(backbone_gw
);
534 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
535 "Sending REQUEST to %pM\n", backbone_gw
->orig
);
538 batadv_bla_send_claim(backbone_gw
->bat_priv
, backbone_gw
->orig
,
539 backbone_gw
->vid
, BATADV_CLAIM_TYPE_REQUEST
);
541 /* no local broadcasts should be sent or received, for now. */
542 if (!atomic_read(&backbone_gw
->request_sent
)) {
543 atomic_inc(&backbone_gw
->bat_priv
->bla
.num_requests
);
544 atomic_set(&backbone_gw
->request_sent
, 1);
549 * batadv_bla_send_announce
550 * @bat_priv: the bat priv with all the soft interface information
551 * @backbone_gw: our backbone gateway which should be announced
553 * This function sends an announcement. It is called from multiple
556 static void batadv_bla_send_announce(struct batadv_priv
*bat_priv
,
557 struct batadv_bla_backbone_gw
*backbone_gw
)
562 memcpy(mac
, batadv_announce_mac
, 4);
563 spin_lock_bh(&backbone_gw
->crc_lock
);
564 crc
= htons(backbone_gw
->crc
);
565 spin_unlock_bh(&backbone_gw
->crc_lock
);
566 memcpy(&mac
[4], &crc
, 2);
568 batadv_bla_send_claim(bat_priv
, mac
, backbone_gw
->vid
,
569 BATADV_CLAIM_TYPE_ANNOUNCE
);
573 * batadv_bla_add_claim - Adds a claim in the claim hash
574 * @bat_priv: the bat priv with all the soft interface information
575 * @mac: the mac address of the claim
576 * @vid: the VLAN ID of the frame
577 * @backbone_gw: the backbone gateway which claims it
579 static void batadv_bla_add_claim(struct batadv_priv
*bat_priv
,
580 const u8
*mac
, const unsigned short vid
,
581 struct batadv_bla_backbone_gw
*backbone_gw
)
583 struct batadv_bla_claim
*claim
;
584 struct batadv_bla_claim search_claim
;
587 ether_addr_copy(search_claim
.addr
, mac
);
588 search_claim
.vid
= vid
;
589 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
591 /* create a new claim entry if it does not exist yet. */
593 claim
= kzalloc(sizeof(*claim
), GFP_ATOMIC
);
597 ether_addr_copy(claim
->addr
, mac
);
599 claim
->lasttime
= jiffies
;
600 claim
->backbone_gw
= backbone_gw
;
602 atomic_set(&claim
->refcount
, 2);
603 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
604 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
605 mac
, BATADV_PRINT_VID(vid
));
606 hash_added
= batadv_hash_add(bat_priv
->bla
.claim_hash
,
607 batadv_compare_claim
,
608 batadv_choose_claim
, claim
,
611 if (unlikely(hash_added
!= 0)) {
612 /* only local changes happened. */
617 claim
->lasttime
= jiffies
;
618 if (claim
->backbone_gw
== backbone_gw
)
619 /* no need to register a new backbone */
622 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
623 "bla_add_claim(): changing ownership for %pM, vid %d\n",
624 mac
, BATADV_PRINT_VID(vid
));
626 spin_lock_bh(&claim
->backbone_gw
->crc_lock
);
627 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
628 spin_unlock_bh(&claim
->backbone_gw
->crc_lock
);
629 batadv_backbone_gw_free_ref(claim
->backbone_gw
);
631 /* set (new) backbone gw */
632 atomic_inc(&backbone_gw
->refcount
);
633 claim
->backbone_gw
= backbone_gw
;
635 spin_lock_bh(&backbone_gw
->crc_lock
);
636 backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
637 spin_unlock_bh(&backbone_gw
->crc_lock
);
638 backbone_gw
->lasttime
= jiffies
;
641 batadv_claim_free_ref(claim
);
644 /* Delete a claim from the claim hash which has the
645 * given mac address and vid.
647 static void batadv_bla_del_claim(struct batadv_priv
*bat_priv
,
648 const u8
*mac
, const unsigned short vid
)
650 struct batadv_bla_claim search_claim
, *claim
;
652 ether_addr_copy(search_claim
.addr
, mac
);
653 search_claim
.vid
= vid
;
654 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
658 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla_del_claim(): %pM, vid %d\n",
659 mac
, BATADV_PRINT_VID(vid
));
661 batadv_hash_remove(bat_priv
->bla
.claim_hash
, batadv_compare_claim
,
662 batadv_choose_claim
, claim
);
663 batadv_claim_free_ref(claim
); /* reference from the hash is gone */
665 spin_lock_bh(&claim
->backbone_gw
->crc_lock
);
666 claim
->backbone_gw
->crc
^= crc16(0, claim
->addr
, ETH_ALEN
);
667 spin_unlock_bh(&claim
->backbone_gw
->crc_lock
);
669 /* don't need the reference from hash_find() anymore */
670 batadv_claim_free_ref(claim
);
673 /* check for ANNOUNCE frame, return 1 if handled */
674 static int batadv_handle_announce(struct batadv_priv
*bat_priv
, u8
*an_addr
,
675 u8
*backbone_addr
, unsigned short vid
)
677 struct batadv_bla_backbone_gw
*backbone_gw
;
678 u16 backbone_crc
, crc
;
680 if (memcmp(an_addr
, batadv_announce_mac
, 4) != 0)
683 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
,
686 if (unlikely(!backbone_gw
))
689 /* handle as ANNOUNCE frame */
690 backbone_gw
->lasttime
= jiffies
;
691 crc
= ntohs(*((__be16
*)(&an_addr
[4])));
693 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
694 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
695 BATADV_PRINT_VID(vid
), backbone_gw
->orig
, crc
);
697 spin_lock_bh(&backbone_gw
->crc_lock
);
698 backbone_crc
= backbone_gw
->crc
;
699 spin_unlock_bh(&backbone_gw
->crc_lock
);
701 if (backbone_crc
!= crc
) {
702 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
703 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
705 BATADV_PRINT_VID(backbone_gw
->vid
),
708 batadv_bla_send_request(backbone_gw
);
710 /* if we have sent a request and the crc was OK,
711 * we can allow traffic again.
713 if (atomic_read(&backbone_gw
->request_sent
)) {
714 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
715 atomic_set(&backbone_gw
->request_sent
, 0);
719 batadv_backbone_gw_free_ref(backbone_gw
);
723 /* check for REQUEST frame, return 1 if handled */
724 static int batadv_handle_request(struct batadv_priv
*bat_priv
,
725 struct batadv_hard_iface
*primary_if
,
726 u8
*backbone_addr
, struct ethhdr
*ethhdr
,
729 /* check for REQUEST frame */
730 if (!batadv_compare_eth(backbone_addr
, ethhdr
->h_dest
))
733 /* sanity check, this should not happen on a normal switch,
734 * we ignore it in this case.
736 if (!batadv_compare_eth(ethhdr
->h_dest
, primary_if
->net_dev
->dev_addr
))
739 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
740 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
741 BATADV_PRINT_VID(vid
), ethhdr
->h_source
);
743 batadv_bla_answer_request(bat_priv
, primary_if
, vid
);
747 /* check for UNCLAIM frame, return 1 if handled */
748 static int batadv_handle_unclaim(struct batadv_priv
*bat_priv
,
749 struct batadv_hard_iface
*primary_if
,
750 u8
*backbone_addr
, u8
*claim_addr
,
753 struct batadv_bla_backbone_gw
*backbone_gw
;
755 /* unclaim in any case if it is our own */
756 if (primary_if
&& batadv_compare_eth(backbone_addr
,
757 primary_if
->net_dev
->dev_addr
))
758 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
759 BATADV_CLAIM_TYPE_UNCLAIM
);
761 backbone_gw
= batadv_backbone_hash_find(bat_priv
, backbone_addr
, vid
);
766 /* this must be an UNCLAIM frame */
767 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
768 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
769 claim_addr
, BATADV_PRINT_VID(vid
), backbone_gw
->orig
);
771 batadv_bla_del_claim(bat_priv
, claim_addr
, vid
);
772 batadv_backbone_gw_free_ref(backbone_gw
);
776 /* check for CLAIM frame, return 1 if handled */
777 static int batadv_handle_claim(struct batadv_priv
*bat_priv
,
778 struct batadv_hard_iface
*primary_if
,
779 u8
*backbone_addr
, u8
*claim_addr
,
782 struct batadv_bla_backbone_gw
*backbone_gw
;
784 /* register the gateway if not yet available, and add the claim. */
786 backbone_gw
= batadv_bla_get_backbone_gw(bat_priv
, backbone_addr
, vid
,
789 if (unlikely(!backbone_gw
))
792 /* this must be a CLAIM frame */
793 batadv_bla_add_claim(bat_priv
, claim_addr
, vid
, backbone_gw
);
794 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
795 batadv_bla_send_claim(bat_priv
, claim_addr
, vid
,
796 BATADV_CLAIM_TYPE_CLAIM
);
798 /* TODO: we could call something like tt_local_del() here. */
800 batadv_backbone_gw_free_ref(backbone_gw
);
805 * batadv_check_claim_group
806 * @bat_priv: the bat priv with all the soft interface information
807 * @primary_if: the primary interface of this batman interface
808 * @hw_src: the Hardware source in the ARP Header
809 * @hw_dst: the Hardware destination in the ARP Header
810 * @ethhdr: pointer to the Ethernet header of the claim frame
812 * checks if it is a claim packet and if its on the same group.
813 * This function also applies the group ID of the sender
814 * if it is in the same mesh.
817 * 2 - if it is a claim packet and on the same group
818 * 1 - if is a claim packet from another group
819 * 0 - if it is not a claim packet
821 static int batadv_check_claim_group(struct batadv_priv
*bat_priv
,
822 struct batadv_hard_iface
*primary_if
,
823 u8
*hw_src
, u8
*hw_dst
,
824 struct ethhdr
*ethhdr
)
827 struct batadv_orig_node
*orig_node
;
828 struct batadv_bla_claim_dst
*bla_dst
, *bla_dst_own
;
830 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
831 bla_dst_own
= &bat_priv
->bla
.claim_dest
;
833 /* if announcement packet, use the source,
834 * otherwise assume it is in the hw_src
836 switch (bla_dst
->type
) {
837 case BATADV_CLAIM_TYPE_CLAIM
:
838 backbone_addr
= hw_src
;
840 case BATADV_CLAIM_TYPE_REQUEST
:
841 case BATADV_CLAIM_TYPE_ANNOUNCE
:
842 case BATADV_CLAIM_TYPE_UNCLAIM
:
843 backbone_addr
= ethhdr
->h_source
;
849 /* don't accept claim frames from ourselves */
850 if (batadv_compare_eth(backbone_addr
, primary_if
->net_dev
->dev_addr
))
853 /* if its already the same group, it is fine. */
854 if (bla_dst
->group
== bla_dst_own
->group
)
857 /* lets see if this originator is in our mesh */
858 orig_node
= batadv_orig_hash_find(bat_priv
, backbone_addr
);
860 /* dont accept claims from gateways which are not in
861 * the same mesh or group.
866 /* if our mesh friends mac is bigger, use it for ourselves. */
867 if (ntohs(bla_dst
->group
) > ntohs(bla_dst_own
->group
)) {
868 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
869 "taking other backbones claim group: %#.4x\n",
870 ntohs(bla_dst
->group
));
871 bla_dst_own
->group
= bla_dst
->group
;
874 batadv_orig_node_free_ref(orig_node
);
880 * batadv_bla_process_claim
881 * @bat_priv: the bat priv with all the soft interface information
882 * @primary_if: the primary hard interface of this batman soft interface
883 * @skb: the frame to be checked
885 * Check if this is a claim frame, and process it accordingly.
887 * returns 1 if it was a claim frame, otherwise return 0 to
888 * tell the callee that it can use the frame on its own.
890 static int batadv_bla_process_claim(struct batadv_priv
*bat_priv
,
891 struct batadv_hard_iface
*primary_if
,
894 struct batadv_bla_claim_dst
*bla_dst
, *bla_dst_own
;
896 struct vlan_hdr
*vhdr
, vhdr_buf
;
897 struct ethhdr
*ethhdr
;
898 struct arphdr
*arphdr
;
905 vid
= batadv_get_vid(skb
, 0);
906 ethhdr
= eth_hdr(skb
);
908 proto
= ethhdr
->h_proto
;
910 if (vid
& BATADV_VLAN_HAS_TAG
) {
911 /* Traverse the VLAN/Ethertypes.
913 * At this point it is known that the first protocol is a VLAN
914 * header, so start checking at the encapsulated protocol.
916 * The depth of the VLAN headers is recorded to drop BLA claim
917 * frames encapsulated into multiple VLAN headers (QinQ).
920 vhdr
= skb_header_pointer(skb
, headlen
, VLAN_HLEN
,
925 proto
= vhdr
->h_vlan_encapsulated_proto
;
926 headlen
+= VLAN_HLEN
;
928 } while (proto
== htons(ETH_P_8021Q
));
931 if (proto
!= htons(ETH_P_ARP
))
932 return 0; /* not a claim frame */
934 /* this must be a ARP frame. check if it is a claim. */
936 if (unlikely(!pskb_may_pull(skb
, headlen
+ arp_hdr_len(skb
->dev
))))
939 /* pskb_may_pull() may have modified the pointers, get ethhdr again */
940 ethhdr
= eth_hdr(skb
);
941 arphdr
= (struct arphdr
*)((u8
*)ethhdr
+ headlen
);
943 /* Check whether the ARP frame carries a valid
946 if (arphdr
->ar_hrd
!= htons(ARPHRD_ETHER
))
948 if (arphdr
->ar_pro
!= htons(ETH_P_IP
))
950 if (arphdr
->ar_hln
!= ETH_ALEN
)
952 if (arphdr
->ar_pln
!= 4)
955 hw_src
= (u8
*)arphdr
+ sizeof(struct arphdr
);
956 hw_dst
= hw_src
+ ETH_ALEN
+ 4;
957 bla_dst
= (struct batadv_bla_claim_dst
*)hw_dst
;
958 bla_dst_own
= &bat_priv
->bla
.claim_dest
;
960 /* check if it is a claim frame in general */
961 if (memcmp(bla_dst
->magic
, bla_dst_own
->magic
,
962 sizeof(bla_dst
->magic
)) != 0)
965 /* check if there is a claim frame encapsulated deeper in (QinQ) and
966 * drop that, as this is not supported by BLA but should also not be
972 /* check if it is a claim frame. */
973 ret
= batadv_check_claim_group(bat_priv
, primary_if
, hw_src
, hw_dst
,
976 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
977 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
978 ethhdr
->h_source
, BATADV_PRINT_VID(vid
), hw_src
,
984 /* become a backbone gw ourselves on this vlan if not happened yet */
985 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
987 /* check for the different types of claim frames ... */
988 switch (bla_dst
->type
) {
989 case BATADV_CLAIM_TYPE_CLAIM
:
990 if (batadv_handle_claim(bat_priv
, primary_if
, hw_src
,
991 ethhdr
->h_source
, vid
))
994 case BATADV_CLAIM_TYPE_UNCLAIM
:
995 if (batadv_handle_unclaim(bat_priv
, primary_if
,
996 ethhdr
->h_source
, hw_src
, vid
))
1000 case BATADV_CLAIM_TYPE_ANNOUNCE
:
1001 if (batadv_handle_announce(bat_priv
, hw_src
, ethhdr
->h_source
,
1005 case BATADV_CLAIM_TYPE_REQUEST
:
1006 if (batadv_handle_request(bat_priv
, primary_if
, hw_src
, ethhdr
,
1012 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1013 "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",
1014 ethhdr
->h_source
, BATADV_PRINT_VID(vid
), hw_src
, hw_dst
);
1018 /* Check when we last heard from other nodes, and remove them in case of
1019 * a time out, or clean all backbone gws if now is set.
1021 static void batadv_bla_purge_backbone_gw(struct batadv_priv
*bat_priv
, int now
)
1023 struct batadv_bla_backbone_gw
*backbone_gw
;
1024 struct hlist_node
*node_tmp
;
1025 struct hlist_head
*head
;
1026 struct batadv_hashtable
*hash
;
1027 spinlock_t
*list_lock
; /* protects write access to the hash lists */
1030 hash
= bat_priv
->bla
.backbone_hash
;
1034 for (i
= 0; i
< hash
->size
; i
++) {
1035 head
= &hash
->table
[i
];
1036 list_lock
= &hash
->list_locks
[i
];
1038 spin_lock_bh(list_lock
);
1039 hlist_for_each_entry_safe(backbone_gw
, node_tmp
,
1043 if (!batadv_has_timed_out(backbone_gw
->lasttime
,
1044 BATADV_BLA_BACKBONE_TIMEOUT
))
1047 batadv_dbg(BATADV_DBG_BLA
, backbone_gw
->bat_priv
,
1048 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1052 /* don't wait for the pending request anymore */
1053 if (atomic_read(&backbone_gw
->request_sent
))
1054 atomic_dec(&bat_priv
->bla
.num_requests
);
1056 batadv_bla_del_backbone_claims(backbone_gw
);
1058 hlist_del_rcu(&backbone_gw
->hash_entry
);
1059 batadv_backbone_gw_free_ref(backbone_gw
);
1061 spin_unlock_bh(list_lock
);
1066 * batadv_bla_purge_claims
1067 * @bat_priv: the bat priv with all the soft interface information
1068 * @primary_if: the selected primary interface, may be NULL if now is set
1069 * @now: whether the whole hash shall be wiped now
1071 * Check when we heard last time from our own claims, and remove them in case of
1072 * a time out, or clean all claims if now is set
1074 static void batadv_bla_purge_claims(struct batadv_priv
*bat_priv
,
1075 struct batadv_hard_iface
*primary_if
,
1078 struct batadv_bla_claim
*claim
;
1079 struct hlist_head
*head
;
1080 struct batadv_hashtable
*hash
;
1083 hash
= bat_priv
->bla
.claim_hash
;
1087 for (i
= 0; i
< hash
->size
; i
++) {
1088 head
= &hash
->table
[i
];
1091 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
1094 if (!batadv_compare_eth(claim
->backbone_gw
->orig
,
1095 primary_if
->net_dev
->dev_addr
))
1097 if (!batadv_has_timed_out(claim
->lasttime
,
1098 BATADV_BLA_CLAIM_TIMEOUT
))
1101 batadv_dbg(BATADV_DBG_BLA
, bat_priv
,
1102 "bla_purge_claims(): %pM, vid %d, time out\n",
1103 claim
->addr
, claim
->vid
);
1106 batadv_handle_unclaim(bat_priv
, primary_if
,
1107 claim
->backbone_gw
->orig
,
1108 claim
->addr
, claim
->vid
);
1115 * batadv_bla_update_orig_address
1116 * @bat_priv: the bat priv with all the soft interface information
1117 * @primary_if: the new selected primary_if
1118 * @oldif: the old primary interface, may be NULL
1120 * Update the backbone gateways when the own orig address changes.
1122 void batadv_bla_update_orig_address(struct batadv_priv
*bat_priv
,
1123 struct batadv_hard_iface
*primary_if
,
1124 struct batadv_hard_iface
*oldif
)
1126 struct batadv_bla_backbone_gw
*backbone_gw
;
1127 struct hlist_head
*head
;
1128 struct batadv_hashtable
*hash
;
1132 /* reset bridge loop avoidance group id */
1133 group
= htons(crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
));
1134 bat_priv
->bla
.claim_dest
.group
= group
;
1136 /* purge everything when bridge loop avoidance is turned off */
1137 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1141 batadv_bla_purge_claims(bat_priv
, NULL
, 1);
1142 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1146 hash
= bat_priv
->bla
.backbone_hash
;
1150 for (i
= 0; i
< hash
->size
; i
++) {
1151 head
= &hash
->table
[i
];
1154 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1155 /* own orig still holds the old value. */
1156 if (!batadv_compare_eth(backbone_gw
->orig
,
1157 oldif
->net_dev
->dev_addr
))
1160 ether_addr_copy(backbone_gw
->orig
,
1161 primary_if
->net_dev
->dev_addr
);
1162 /* send an announce frame so others will ask for our
1163 * claims and update their tables.
1165 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1172 * batadv_bla_status_update - purge bla interfaces if necessary
1173 * @net_dev: the soft interface net device
1175 void batadv_bla_status_update(struct net_device
*net_dev
)
1177 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1178 struct batadv_hard_iface
*primary_if
;
1180 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1184 /* this function already purges everything when bla is disabled,
1185 * so just call that one.
1187 batadv_bla_update_orig_address(bat_priv
, primary_if
, primary_if
);
1188 batadv_hardif_free_ref(primary_if
);
1191 /* periodic work to do:
1192 * * purge structures when they are too old
1193 * * send announcements
1195 static void batadv_bla_periodic_work(struct work_struct
*work
)
1197 struct delayed_work
*delayed_work
;
1198 struct batadv_priv
*bat_priv
;
1199 struct batadv_priv_bla
*priv_bla
;
1200 struct hlist_head
*head
;
1201 struct batadv_bla_backbone_gw
*backbone_gw
;
1202 struct batadv_hashtable
*hash
;
1203 struct batadv_hard_iface
*primary_if
;
1206 delayed_work
= container_of(work
, struct delayed_work
, work
);
1207 priv_bla
= container_of(delayed_work
, struct batadv_priv_bla
, work
);
1208 bat_priv
= container_of(priv_bla
, struct batadv_priv
, bla
);
1209 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1213 batadv_bla_purge_claims(bat_priv
, primary_if
, 0);
1214 batadv_bla_purge_backbone_gw(bat_priv
, 0);
1216 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1219 hash
= bat_priv
->bla
.backbone_hash
;
1223 for (i
= 0; i
< hash
->size
; i
++) {
1224 head
= &hash
->table
[i
];
1227 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1228 if (!batadv_compare_eth(backbone_gw
->orig
,
1229 primary_if
->net_dev
->dev_addr
))
1232 backbone_gw
->lasttime
= jiffies
;
1234 batadv_bla_send_announce(bat_priv
, backbone_gw
);
1236 /* request_sent is only set after creation to avoid
1237 * problems when we are not yet known as backbone gw
1240 * We can reset this now after we waited some periods
1241 * to give bridge forward delays and bla group forming
1245 if (atomic_read(&backbone_gw
->request_sent
) == 0)
1248 if (!atomic_dec_and_test(&backbone_gw
->wait_periods
))
1251 atomic_dec(&backbone_gw
->bat_priv
->bla
.num_requests
);
1252 atomic_set(&backbone_gw
->request_sent
, 0);
1258 batadv_hardif_free_ref(primary_if
);
1260 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1261 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1264 /* The hash for claim and backbone hash receive the same key because they
1265 * are getting initialized by hash_new with the same key. Reinitializing
1266 * them with to different keys to allow nested locking without generating
1269 static struct lock_class_key batadv_claim_hash_lock_class_key
;
1270 static struct lock_class_key batadv_backbone_hash_lock_class_key
;
1272 /* initialize all bla structures */
1273 int batadv_bla_init(struct batadv_priv
*bat_priv
)
1276 u8 claim_dest
[ETH_ALEN
] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1277 struct batadv_hard_iface
*primary_if
;
1279 unsigned long entrytime
;
1281 spin_lock_init(&bat_priv
->bla
.bcast_duplist_lock
);
1283 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hash registering\n");
1285 /* setting claim destination address */
1286 memcpy(&bat_priv
->bla
.claim_dest
.magic
, claim_dest
, 3);
1287 bat_priv
->bla
.claim_dest
.type
= 0;
1288 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1290 crc
= crc16(0, primary_if
->net_dev
->dev_addr
, ETH_ALEN
);
1291 bat_priv
->bla
.claim_dest
.group
= htons(crc
);
1292 batadv_hardif_free_ref(primary_if
);
1294 bat_priv
->bla
.claim_dest
.group
= 0; /* will be set later */
1297 /* initialize the duplicate list */
1298 entrytime
= jiffies
- msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT
);
1299 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++)
1300 bat_priv
->bla
.bcast_duplist
[i
].entrytime
= entrytime
;
1301 bat_priv
->bla
.bcast_duplist_curr
= 0;
1303 if (bat_priv
->bla
.claim_hash
)
1306 bat_priv
->bla
.claim_hash
= batadv_hash_new(128);
1307 bat_priv
->bla
.backbone_hash
= batadv_hash_new(32);
1309 if (!bat_priv
->bla
.claim_hash
|| !bat_priv
->bla
.backbone_hash
)
1312 batadv_hash_set_lock_class(bat_priv
->bla
.claim_hash
,
1313 &batadv_claim_hash_lock_class_key
);
1314 batadv_hash_set_lock_class(bat_priv
->bla
.backbone_hash
,
1315 &batadv_backbone_hash_lock_class_key
);
1317 batadv_dbg(BATADV_DBG_BLA
, bat_priv
, "bla hashes initialized\n");
1319 INIT_DELAYED_WORK(&bat_priv
->bla
.work
, batadv_bla_periodic_work
);
1321 queue_delayed_work(batadv_event_workqueue
, &bat_priv
->bla
.work
,
1322 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH
));
1327 * batadv_bla_check_bcast_duplist
1328 * @bat_priv: the bat priv with all the soft interface information
1329 * @skb: contains the bcast_packet to be checked
1331 * check if it is on our broadcast list. Another gateway might
1332 * have sent the same packet because it is connected to the same backbone,
1333 * so we have to remove this duplicate.
1335 * This is performed by checking the CRC, which will tell us
1336 * with a good chance that it is the same packet. If it is furthermore
1337 * sent by another host, drop it. We allow equal packets from
1338 * the same host however as this might be intended.
1340 int batadv_bla_check_bcast_duplist(struct batadv_priv
*bat_priv
,
1341 struct sk_buff
*skb
)
1343 int i
, curr
, ret
= 0;
1345 struct batadv_bcast_packet
*bcast_packet
;
1346 struct batadv_bcast_duplist_entry
*entry
;
1348 bcast_packet
= (struct batadv_bcast_packet
*)skb
->data
;
1350 /* calculate the crc ... */
1351 crc
= batadv_skb_crc32(skb
, (u8
*)(bcast_packet
+ 1));
1353 spin_lock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1355 for (i
= 0; i
< BATADV_DUPLIST_SIZE
; i
++) {
1356 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ i
);
1357 curr
%= BATADV_DUPLIST_SIZE
;
1358 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1360 /* we can stop searching if the entry is too old ;
1361 * later entries will be even older
1363 if (batadv_has_timed_out(entry
->entrytime
,
1364 BATADV_DUPLIST_TIMEOUT
))
1367 if (entry
->crc
!= crc
)
1370 if (batadv_compare_eth(entry
->orig
, bcast_packet
->orig
))
1373 /* this entry seems to match: same crc, not too old,
1374 * and from another gw. therefore return 1 to forbid it.
1379 /* not found, add a new entry (overwrite the oldest entry)
1380 * and allow it, its the first occurrence.
1382 curr
= (bat_priv
->bla
.bcast_duplist_curr
+ BATADV_DUPLIST_SIZE
- 1);
1383 curr
%= BATADV_DUPLIST_SIZE
;
1384 entry
= &bat_priv
->bla
.bcast_duplist
[curr
];
1386 entry
->entrytime
= jiffies
;
1387 ether_addr_copy(entry
->orig
, bcast_packet
->orig
);
1388 bat_priv
->bla
.bcast_duplist_curr
= curr
;
1391 spin_unlock_bh(&bat_priv
->bla
.bcast_duplist_lock
);
1397 * batadv_bla_is_backbone_gw_orig
1398 * @bat_priv: the bat priv with all the soft interface information
1399 * @orig: originator mac address
1400 * @vid: VLAN identifier
1402 * Check if the originator is a gateway for the VLAN identified by vid.
1404 * Returns true if orig is a backbone for this vid, false otherwise.
1406 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv
*bat_priv
, u8
*orig
,
1409 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1410 struct hlist_head
*head
;
1411 struct batadv_bla_backbone_gw
*backbone_gw
;
1414 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1420 for (i
= 0; i
< hash
->size
; i
++) {
1421 head
= &hash
->table
[i
];
1424 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1425 if (batadv_compare_eth(backbone_gw
->orig
, orig
) &&
1426 backbone_gw
->vid
== vid
) {
1438 * batadv_bla_is_backbone_gw
1439 * @skb: the frame to be checked
1440 * @orig_node: the orig_node of the frame
1441 * @hdr_size: maximum length of the frame
1443 * bla_is_backbone_gw inspects the skb for the VLAN ID and returns 1
1444 * if the orig_node is also a gateway on the soft interface, otherwise it
1447 int batadv_bla_is_backbone_gw(struct sk_buff
*skb
,
1448 struct batadv_orig_node
*orig_node
, int hdr_size
)
1450 struct batadv_bla_backbone_gw
*backbone_gw
;
1453 if (!atomic_read(&orig_node
->bat_priv
->bridge_loop_avoidance
))
1456 /* first, find out the vid. */
1457 if (!pskb_may_pull(skb
, hdr_size
+ ETH_HLEN
))
1460 vid
= batadv_get_vid(skb
, hdr_size
);
1462 /* see if this originator is a backbone gw for this VLAN */
1463 backbone_gw
= batadv_backbone_hash_find(orig_node
->bat_priv
,
1464 orig_node
->orig
, vid
);
1468 batadv_backbone_gw_free_ref(backbone_gw
);
1472 /* free all bla structures (for softinterface free or module unload) */
1473 void batadv_bla_free(struct batadv_priv
*bat_priv
)
1475 struct batadv_hard_iface
*primary_if
;
1477 cancel_delayed_work_sync(&bat_priv
->bla
.work
);
1478 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1480 if (bat_priv
->bla
.claim_hash
) {
1481 batadv_bla_purge_claims(bat_priv
, primary_if
, 1);
1482 batadv_hash_destroy(bat_priv
->bla
.claim_hash
);
1483 bat_priv
->bla
.claim_hash
= NULL
;
1485 if (bat_priv
->bla
.backbone_hash
) {
1486 batadv_bla_purge_backbone_gw(bat_priv
, 1);
1487 batadv_hash_destroy(bat_priv
->bla
.backbone_hash
);
1488 bat_priv
->bla
.backbone_hash
= NULL
;
1491 batadv_hardif_free_ref(primary_if
);
1496 * @bat_priv: the bat priv with all the soft interface information
1497 * @skb: the frame to be checked
1498 * @vid: the VLAN ID of the frame
1499 * @is_bcast: the packet came in a broadcast packet type.
1501 * bla_rx avoidance checks if:
1502 * * we have to race for a claim
1503 * * if the frame is allowed on the LAN
1505 * in these cases, the skb is further handled by this function and
1506 * returns 1, otherwise it returns 0 and the caller shall further
1509 int batadv_bla_rx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
,
1510 unsigned short vid
, bool is_bcast
)
1512 struct ethhdr
*ethhdr
;
1513 struct batadv_bla_claim search_claim
, *claim
= NULL
;
1514 struct batadv_hard_iface
*primary_if
;
1517 ethhdr
= eth_hdr(skb
);
1519 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1523 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1526 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1527 /* don't allow broadcasts while requests are in flight */
1528 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
)
1531 ether_addr_copy(search_claim
.addr
, ethhdr
->h_source
);
1532 search_claim
.vid
= vid
;
1533 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1536 /* possible optimization: race for a claim */
1537 /* No claim exists yet, claim it for us!
1539 batadv_handle_claim(bat_priv
, primary_if
,
1540 primary_if
->net_dev
->dev_addr
,
1541 ethhdr
->h_source
, vid
);
1545 /* if it is our own claim ... */
1546 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1547 primary_if
->net_dev
->dev_addr
)) {
1548 /* ... allow it in any case */
1549 claim
->lasttime
= jiffies
;
1553 /* if it is a broadcast ... */
1554 if (is_multicast_ether_addr(ethhdr
->h_dest
) && is_bcast
) {
1555 /* ... drop it. the responsible gateway is in charge.
1557 * We need to check is_bcast because with the gateway
1558 * feature, broadcasts (like DHCP requests) may be sent
1559 * using a unicast packet type.
1563 /* seems the client considers us as its best gateway.
1564 * send a claim and update the claim table
1567 batadv_handle_claim(bat_priv
, primary_if
,
1568 primary_if
->net_dev
->dev_addr
,
1569 ethhdr
->h_source
, vid
);
1573 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1583 batadv_hardif_free_ref(primary_if
);
1585 batadv_claim_free_ref(claim
);
1591 * @bat_priv: the bat priv with all the soft interface information
1592 * @skb: the frame to be checked
1593 * @vid: the VLAN ID of the frame
1596 * * a claim was received which has to be processed
1597 * * the frame is allowed on the mesh
1599 * in these cases, the skb is further handled by this function and
1600 * returns 1, otherwise it returns 0 and the caller shall further
1603 * This call might reallocate skb data.
1605 int batadv_bla_tx(struct batadv_priv
*bat_priv
, struct sk_buff
*skb
,
1608 struct ethhdr
*ethhdr
;
1609 struct batadv_bla_claim search_claim
, *claim
= NULL
;
1610 struct batadv_hard_iface
*primary_if
;
1613 primary_if
= batadv_primary_if_get_selected(bat_priv
);
1617 if (!atomic_read(&bat_priv
->bridge_loop_avoidance
))
1620 if (batadv_bla_process_claim(bat_priv
, primary_if
, skb
))
1623 ethhdr
= eth_hdr(skb
);
1625 if (unlikely(atomic_read(&bat_priv
->bla
.num_requests
)))
1626 /* don't allow broadcasts while requests are in flight */
1627 if (is_multicast_ether_addr(ethhdr
->h_dest
))
1630 ether_addr_copy(search_claim
.addr
, ethhdr
->h_source
);
1631 search_claim
.vid
= vid
;
1633 claim
= batadv_claim_hash_find(bat_priv
, &search_claim
);
1635 /* if no claim exists, allow it. */
1639 /* check if we are responsible. */
1640 if (batadv_compare_eth(claim
->backbone_gw
->orig
,
1641 primary_if
->net_dev
->dev_addr
)) {
1642 /* if yes, the client has roamed and we have
1645 batadv_handle_unclaim(bat_priv
, primary_if
,
1646 primary_if
->net_dev
->dev_addr
,
1647 ethhdr
->h_source
, vid
);
1651 /* check if it is a multicast/broadcast frame */
1652 if (is_multicast_ether_addr(ethhdr
->h_dest
)) {
1653 /* drop it. the responsible gateway has forwarded it into
1654 * the backbone network.
1658 /* we must allow it. at least if we are
1659 * responsible for the DESTINATION.
1664 batadv_bla_update_own_backbone_gw(bat_priv
, primary_if
, vid
);
1671 batadv_hardif_free_ref(primary_if
);
1673 batadv_claim_free_ref(claim
);
1677 int batadv_bla_claim_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1679 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1680 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1681 struct batadv_hashtable
*hash
= bat_priv
->bla
.claim_hash
;
1682 struct batadv_bla_claim
*claim
;
1683 struct batadv_hard_iface
*primary_if
;
1684 struct hlist_head
*head
;
1690 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1694 primary_addr
= primary_if
->net_dev
->dev_addr
;
1696 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
1697 net_dev
->name
, primary_addr
,
1698 ntohs(bat_priv
->bla
.claim_dest
.group
));
1699 seq_printf(seq
, " %-17s %-5s %-17s [o] (%-6s)\n",
1700 "Client", "VID", "Originator", "CRC");
1701 for (i
= 0; i
< hash
->size
; i
++) {
1702 head
= &hash
->table
[i
];
1705 hlist_for_each_entry_rcu(claim
, head
, hash_entry
) {
1706 is_own
= batadv_compare_eth(claim
->backbone_gw
->orig
,
1709 spin_lock_bh(&claim
->backbone_gw
->crc_lock
);
1710 backbone_crc
= claim
->backbone_gw
->crc
;
1711 spin_unlock_bh(&claim
->backbone_gw
->crc_lock
);
1712 seq_printf(seq
, " * %pM on %5d by %pM [%c] (%#.4x)\n",
1713 claim
->addr
, BATADV_PRINT_VID(claim
->vid
),
1714 claim
->backbone_gw
->orig
,
1715 (is_own
? 'x' : ' '),
1722 batadv_hardif_free_ref(primary_if
);
1726 int batadv_bla_backbone_table_seq_print_text(struct seq_file
*seq
, void *offset
)
1728 struct net_device
*net_dev
= (struct net_device
*)seq
->private;
1729 struct batadv_priv
*bat_priv
= netdev_priv(net_dev
);
1730 struct batadv_hashtable
*hash
= bat_priv
->bla
.backbone_hash
;
1731 struct batadv_bla_backbone_gw
*backbone_gw
;
1732 struct batadv_hard_iface
*primary_if
;
1733 struct hlist_head
*head
;
1740 primary_if
= batadv_seq_print_text_primary_if_get(seq
);
1744 primary_addr
= primary_if
->net_dev
->dev_addr
;
1746 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
1747 net_dev
->name
, primary_addr
,
1748 ntohs(bat_priv
->bla
.claim_dest
.group
));
1749 seq_printf(seq
, " %-17s %-5s %-9s (%-6s)\n",
1750 "Originator", "VID", "last seen", "CRC");
1751 for (i
= 0; i
< hash
->size
; i
++) {
1752 head
= &hash
->table
[i
];
1755 hlist_for_each_entry_rcu(backbone_gw
, head
, hash_entry
) {
1756 msecs
= jiffies_to_msecs(jiffies
-
1757 backbone_gw
->lasttime
);
1758 secs
= msecs
/ 1000;
1759 msecs
= msecs
% 1000;
1761 is_own
= batadv_compare_eth(backbone_gw
->orig
,
1766 spin_lock_bh(&backbone_gw
->crc_lock
);
1767 backbone_crc
= backbone_gw
->crc
;
1768 spin_unlock_bh(&backbone_gw
->crc_lock
);
1770 seq_printf(seq
, " * %pM on %5d %4i.%03is (%#.4x)\n",
1772 BATADV_PRINT_VID(backbone_gw
->vid
), secs
,
1773 msecs
, backbone_crc
);
1779 batadv_hardif_free_ref(primary_if
);