1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#include "bridge_loop_avoidance.h"
19#include "main.h"
20
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>
27#include <linux/fs.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/kref.h>
35#include <linux/list.h>
36#include <linux/lockdep.h>
37#include <linux/netdevice.h>
38#include <linux/netlink.h>
39#include <linux/rculist.h>
40#include <linux/rcupdate.h>
41#include <linux/seq_file.h>
42#include <linux/skbuff.h>
43#include <linux/slab.h>
44#include <linux/spinlock.h>
45#include <linux/stddef.h>
46#include <linux/string.h>
47#include <linux/workqueue.h>
48#include <net/arp.h>
49#include <net/genetlink.h>
50#include <net/netlink.h>
51#include <net/sock.h>
52#include <uapi/linux/batman_adv.h>
53
54#include "hard-interface.h"
55#include "hash.h"
56#include "log.h"
57#include "netlink.h"
58#include "originator.h"
59#include "packet.h"
60#include "soft-interface.h"
61#include "sysfs.h"
62#include "translation-table.h"
63
64static const u8 batadv_announce_mac[4] = {0x43, 0x05, 0x43, 0x05};
65
66static void batadv_bla_periodic_work(struct work_struct *work);
67static void
68batadv_bla_send_announce(struct batadv_priv *bat_priv,
69 struct batadv_bla_backbone_gw *backbone_gw);
70
71
72
73
74
75
76
77
78static inline u32 batadv_choose_claim(const void *data, u32 size)
79{
80 struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
81 u32 hash = 0;
82
83 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
84 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
85
86 return hash % size;
87}
88
89
90
91
92
93
94
95
96static inline u32 batadv_choose_backbone_gw(const void *data, u32 size)
97{
98 const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data;
99 u32 hash = 0;
100
101 hash = jhash(&claim->addr, sizeof(claim->addr), hash);
102 hash = jhash(&claim->vid, sizeof(claim->vid), hash);
103
104 return hash % size;
105}
106
107
108
109
110
111
112
113
114static bool batadv_compare_backbone_gw(const struct hlist_node *node,
115 const void *data2)
116{
117 const void *data1 = container_of(node, struct batadv_bla_backbone_gw,
118 hash_entry);
119 const struct batadv_bla_backbone_gw *gw1 = data1;
120 const struct batadv_bla_backbone_gw *gw2 = data2;
121
122 if (!batadv_compare_eth(gw1->orig, gw2->orig))
123 return false;
124
125 if (gw1->vid != gw2->vid)
126 return false;
127
128 return true;
129}
130
131
132
133
134
135
136
137
138static bool batadv_compare_claim(const struct hlist_node *node,
139 const void *data2)
140{
141 const void *data1 = container_of(node, struct batadv_bla_claim,
142 hash_entry);
143 const struct batadv_bla_claim *cl1 = data1;
144 const struct batadv_bla_claim *cl2 = data2;
145
146 if (!batadv_compare_eth(cl1->addr, cl2->addr))
147 return false;
148
149 if (cl1->vid != cl2->vid)
150 return false;
151
152 return true;
153}
154
155
156
157
158
159
160static void batadv_backbone_gw_release(struct kref *ref)
161{
162 struct batadv_bla_backbone_gw *backbone_gw;
163
164 backbone_gw = container_of(ref, struct batadv_bla_backbone_gw,
165 refcount);
166
167 kfree_rcu(backbone_gw, rcu);
168}
169
170
171
172
173
174
175static void batadv_backbone_gw_put(struct batadv_bla_backbone_gw *backbone_gw)
176{
177 kref_put(&backbone_gw->refcount, batadv_backbone_gw_release);
178}
179
180
181
182
183
184
185static void batadv_claim_release(struct kref *ref)
186{
187 struct batadv_bla_claim *claim;
188 struct batadv_bla_backbone_gw *old_backbone_gw;
189
190 claim = container_of(ref, struct batadv_bla_claim, refcount);
191
192 spin_lock_bh(&claim->backbone_lock);
193 old_backbone_gw = claim->backbone_gw;
194 claim->backbone_gw = NULL;
195 spin_unlock_bh(&claim->backbone_lock);
196
197 spin_lock_bh(&old_backbone_gw->crc_lock);
198 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
199 spin_unlock_bh(&old_backbone_gw->crc_lock);
200
201 batadv_backbone_gw_put(old_backbone_gw);
202
203 kfree_rcu(claim, rcu);
204}
205
206
207
208
209
210
211static void batadv_claim_put(struct batadv_bla_claim *claim)
212{
213 kref_put(&claim->refcount, batadv_claim_release);
214}
215
216
217
218
219
220
221
222
223static struct batadv_bla_claim *
224batadv_claim_hash_find(struct batadv_priv *bat_priv,
225 struct batadv_bla_claim *data)
226{
227 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
228 struct hlist_head *head;
229 struct batadv_bla_claim *claim;
230 struct batadv_bla_claim *claim_tmp = NULL;
231 int index;
232
233 if (!hash)
234 return NULL;
235
236 index = batadv_choose_claim(data, hash->size);
237 head = &hash->table[index];
238
239 rcu_read_lock();
240 hlist_for_each_entry_rcu(claim, head, hash_entry) {
241 if (!batadv_compare_claim(&claim->hash_entry, data))
242 continue;
243
244 if (!kref_get_unless_zero(&claim->refcount))
245 continue;
246
247 claim_tmp = claim;
248 break;
249 }
250 rcu_read_unlock();
251
252 return claim_tmp;
253}
254
255
256
257
258
259
260
261
262
263static struct batadv_bla_backbone_gw *
264batadv_backbone_hash_find(struct batadv_priv *bat_priv, u8 *addr,
265 unsigned short vid)
266{
267 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
268 struct hlist_head *head;
269 struct batadv_bla_backbone_gw search_entry, *backbone_gw;
270 struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL;
271 int index;
272
273 if (!hash)
274 return NULL;
275
276 ether_addr_copy(search_entry.orig, addr);
277 search_entry.vid = vid;
278
279 index = batadv_choose_backbone_gw(&search_entry, hash->size);
280 head = &hash->table[index];
281
282 rcu_read_lock();
283 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
284 if (!batadv_compare_backbone_gw(&backbone_gw->hash_entry,
285 &search_entry))
286 continue;
287
288 if (!kref_get_unless_zero(&backbone_gw->refcount))
289 continue;
290
291 backbone_gw_tmp = backbone_gw;
292 break;
293 }
294 rcu_read_unlock();
295
296 return backbone_gw_tmp;
297}
298
299
300
301
302
303static void
304batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
305{
306 struct batadv_hashtable *hash;
307 struct hlist_node *node_tmp;
308 struct hlist_head *head;
309 struct batadv_bla_claim *claim;
310 int i;
311 spinlock_t *list_lock;
312
313 hash = backbone_gw->bat_priv->bla.claim_hash;
314 if (!hash)
315 return;
316
317 for (i = 0; i < hash->size; i++) {
318 head = &hash->table[i];
319 list_lock = &hash->list_locks[i];
320
321 spin_lock_bh(list_lock);
322 hlist_for_each_entry_safe(claim, node_tmp,
323 head, hash_entry) {
324 if (claim->backbone_gw != backbone_gw)
325 continue;
326
327 batadv_claim_put(claim);
328 hlist_del_rcu(&claim->hash_entry);
329 }
330 spin_unlock_bh(list_lock);
331 }
332
333
334 spin_lock_bh(&backbone_gw->crc_lock);
335 backbone_gw->crc = BATADV_BLA_CRC_INIT;
336 spin_unlock_bh(&backbone_gw->crc_lock);
337}
338
339
340
341
342
343
344
345
346static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
347 unsigned short vid, int claimtype)
348{
349 struct sk_buff *skb;
350 struct ethhdr *ethhdr;
351 struct batadv_hard_iface *primary_if;
352 struct net_device *soft_iface;
353 u8 *hw_src;
354 struct batadv_bla_claim_dst local_claim_dest;
355 __be32 zeroip = 0;
356
357 primary_if = batadv_primary_if_get_selected(bat_priv);
358 if (!primary_if)
359 return;
360
361 memcpy(&local_claim_dest, &bat_priv->bla.claim_dest,
362 sizeof(local_claim_dest));
363 local_claim_dest.type = claimtype;
364
365 soft_iface = primary_if->soft_iface;
366
367 skb = arp_create(ARPOP_REPLY, ETH_P_ARP,
368
369 zeroip,
370 primary_if->soft_iface,
371
372 zeroip,
373
374 NULL,
375
376 primary_if->net_dev->dev_addr,
377
378
379
380
381 (u8 *)&local_claim_dest);
382
383 if (!skb)
384 goto out;
385
386 ethhdr = (struct ethhdr *)skb->data;
387 hw_src = (u8 *)ethhdr + ETH_HLEN + sizeof(struct arphdr);
388
389
390 switch (claimtype) {
391 case BATADV_CLAIM_TYPE_CLAIM:
392
393
394
395 ether_addr_copy(ethhdr->h_source, mac);
396 batadv_dbg(BATADV_DBG_BLA, bat_priv,
397 "bla_send_claim(): CLAIM %pM on vid %d\n", mac,
398 BATADV_PRINT_VID(vid));
399 break;
400 case BATADV_CLAIM_TYPE_UNCLAIM:
401
402
403
404 ether_addr_copy(hw_src, mac);
405 batadv_dbg(BATADV_DBG_BLA, bat_priv,
406 "bla_send_claim(): UNCLAIM %pM on vid %d\n", mac,
407 BATADV_PRINT_VID(vid));
408 break;
409 case BATADV_CLAIM_TYPE_ANNOUNCE:
410
411
412
413 ether_addr_copy(hw_src, mac);
414 batadv_dbg(BATADV_DBG_BLA, bat_priv,
415 "bla_send_claim(): ANNOUNCE of %pM on vid %d\n",
416 ethhdr->h_source, BATADV_PRINT_VID(vid));
417 break;
418 case BATADV_CLAIM_TYPE_REQUEST:
419
420
421
422
423 ether_addr_copy(hw_src, mac);
424 ether_addr_copy(ethhdr->h_dest, mac);
425 batadv_dbg(BATADV_DBG_BLA, bat_priv,
426 "bla_send_claim(): REQUEST of %pM to %pM on vid %d\n",
427 ethhdr->h_source, ethhdr->h_dest,
428 BATADV_PRINT_VID(vid));
429 break;
430 case BATADV_CLAIM_TYPE_LOOPDETECT:
431 ether_addr_copy(ethhdr->h_source, mac);
432 batadv_dbg(BATADV_DBG_BLA, bat_priv,
433 "bla_send_claim(): LOOPDETECT of %pM to %pM on vid %d\n",
434 ethhdr->h_source, ethhdr->h_dest,
435 BATADV_PRINT_VID(vid));
436
437 break;
438 }
439
440 if (vid & BATADV_VLAN_HAS_TAG) {
441 skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
442 vid & VLAN_VID_MASK);
443 if (!skb)
444 goto out;
445 }
446
447 skb_reset_mac_header(skb);
448 skb->protocol = eth_type_trans(skb, soft_iface);
449 batadv_inc_counter(bat_priv, BATADV_CNT_RX);
450 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES,
451 skb->len + ETH_HLEN);
452 soft_iface->last_rx = jiffies;
453
454 netif_rx(skb);
455out:
456 if (primary_if)
457 batadv_hardif_put(primary_if);
458}
459
460
461
462
463
464
465
466
467static void batadv_bla_loopdetect_report(struct work_struct *work)
468{
469 struct batadv_bla_backbone_gw *backbone_gw;
470 struct batadv_priv *bat_priv;
471 char vid_str[6] = { '\0' };
472
473 backbone_gw = container_of(work, struct batadv_bla_backbone_gw,
474 report_work);
475 bat_priv = backbone_gw->bat_priv;
476
477 batadv_info(bat_priv->soft_iface,
478 "Possible loop on VLAN %d detected which can't be handled by BLA - please check your network setup!\n",
479 BATADV_PRINT_VID(backbone_gw->vid));
480 snprintf(vid_str, sizeof(vid_str), "%d",
481 BATADV_PRINT_VID(backbone_gw->vid));
482 vid_str[sizeof(vid_str) - 1] = 0;
483
484 batadv_throw_uevent(bat_priv, BATADV_UEV_BLA, BATADV_UEV_LOOPDETECT,
485 vid_str);
486
487 batadv_backbone_gw_put(backbone_gw);
488}
489
490
491
492
493
494
495
496
497
498
499static struct batadv_bla_backbone_gw *
500batadv_bla_get_backbone_gw(struct batadv_priv *bat_priv, u8 *orig,
501 unsigned short vid, bool own_backbone)
502{
503 struct batadv_bla_backbone_gw *entry;
504 struct batadv_orig_node *orig_node;
505 int hash_added;
506
507 entry = batadv_backbone_hash_find(bat_priv, orig, vid);
508
509 if (entry)
510 return entry;
511
512 batadv_dbg(BATADV_DBG_BLA, bat_priv,
513 "bla_get_backbone_gw(): not found (%pM, %d), creating new entry\n",
514 orig, BATADV_PRINT_VID(vid));
515
516 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
517 if (!entry)
518 return NULL;
519
520 entry->vid = vid;
521 entry->lasttime = jiffies;
522 entry->crc = BATADV_BLA_CRC_INIT;
523 entry->bat_priv = bat_priv;
524 spin_lock_init(&entry->crc_lock);
525 atomic_set(&entry->request_sent, 0);
526 atomic_set(&entry->wait_periods, 0);
527 ether_addr_copy(entry->orig, orig);
528 INIT_WORK(&entry->report_work, batadv_bla_loopdetect_report);
529 kref_init(&entry->refcount);
530
531 kref_get(&entry->refcount);
532 hash_added = batadv_hash_add(bat_priv->bla.backbone_hash,
533 batadv_compare_backbone_gw,
534 batadv_choose_backbone_gw, entry,
535 &entry->hash_entry);
536
537 if (unlikely(hash_added != 0)) {
538
539 kfree(entry);
540 return NULL;
541 }
542
543
544 orig_node = batadv_orig_hash_find(bat_priv, orig);
545 if (orig_node) {
546 batadv_tt_global_del_orig(bat_priv, orig_node, vid,
547 "became a backbone gateway");
548 batadv_orig_node_put(orig_node);
549 }
550
551 if (own_backbone) {
552 batadv_bla_send_announce(bat_priv, entry);
553
554
555 atomic_inc(&entry->request_sent);
556 atomic_set(&entry->wait_periods, BATADV_BLA_WAIT_PERIODS);
557 atomic_inc(&bat_priv->bla.num_requests);
558 }
559
560 return entry;
561}
562
563
564
565
566
567
568
569
570
571
572static void
573batadv_bla_update_own_backbone_gw(struct batadv_priv *bat_priv,
574 struct batadv_hard_iface *primary_if,
575 unsigned short vid)
576{
577 struct batadv_bla_backbone_gw *backbone_gw;
578
579 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
580 primary_if->net_dev->dev_addr,
581 vid, true);
582 if (unlikely(!backbone_gw))
583 return;
584
585 backbone_gw->lasttime = jiffies;
586 batadv_backbone_gw_put(backbone_gw);
587}
588
589
590
591
592
593
594
595
596
597
598static void batadv_bla_answer_request(struct batadv_priv *bat_priv,
599 struct batadv_hard_iface *primary_if,
600 unsigned short vid)
601{
602 struct hlist_head *head;
603 struct batadv_hashtable *hash;
604 struct batadv_bla_claim *claim;
605 struct batadv_bla_backbone_gw *backbone_gw;
606 int i;
607
608 batadv_dbg(BATADV_DBG_BLA, bat_priv,
609 "bla_answer_request(): received a claim request, send all of our own claims again\n");
610
611 backbone_gw = batadv_backbone_hash_find(bat_priv,
612 primary_if->net_dev->dev_addr,
613 vid);
614 if (!backbone_gw)
615 return;
616
617 hash = bat_priv->bla.claim_hash;
618 for (i = 0; i < hash->size; i++) {
619 head = &hash->table[i];
620
621 rcu_read_lock();
622 hlist_for_each_entry_rcu(claim, head, hash_entry) {
623
624 if (claim->backbone_gw != backbone_gw)
625 continue;
626
627 batadv_bla_send_claim(bat_priv, claim->addr, claim->vid,
628 BATADV_CLAIM_TYPE_CLAIM);
629 }
630 rcu_read_unlock();
631 }
632
633
634 batadv_bla_send_announce(bat_priv, backbone_gw);
635 batadv_backbone_gw_put(backbone_gw);
636}
637
638
639
640
641
642
643
644
645
646static void batadv_bla_send_request(struct batadv_bla_backbone_gw *backbone_gw)
647{
648
649 batadv_bla_del_backbone_claims(backbone_gw);
650
651 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
652 "Sending REQUEST to %pM\n", backbone_gw->orig);
653
654
655 batadv_bla_send_claim(backbone_gw->bat_priv, backbone_gw->orig,
656 backbone_gw->vid, BATADV_CLAIM_TYPE_REQUEST);
657
658
659 if (!atomic_read(&backbone_gw->request_sent)) {
660 atomic_inc(&backbone_gw->bat_priv->bla.num_requests);
661 atomic_set(&backbone_gw->request_sent, 1);
662 }
663}
664
665
666
667
668
669
670static void batadv_bla_send_announce(struct batadv_priv *bat_priv,
671 struct batadv_bla_backbone_gw *backbone_gw)
672{
673 u8 mac[ETH_ALEN];
674 __be16 crc;
675
676 memcpy(mac, batadv_announce_mac, 4);
677 spin_lock_bh(&backbone_gw->crc_lock);
678 crc = htons(backbone_gw->crc);
679 spin_unlock_bh(&backbone_gw->crc_lock);
680 memcpy(&mac[4], &crc, 2);
681
682 batadv_bla_send_claim(bat_priv, mac, backbone_gw->vid,
683 BATADV_CLAIM_TYPE_ANNOUNCE);
684}
685
686
687
688
689
690
691
692
693static void batadv_bla_add_claim(struct batadv_priv *bat_priv,
694 const u8 *mac, const unsigned short vid,
695 struct batadv_bla_backbone_gw *backbone_gw)
696{
697 struct batadv_bla_backbone_gw *old_backbone_gw;
698 struct batadv_bla_claim *claim;
699 struct batadv_bla_claim search_claim;
700 bool remove_crc = false;
701 int hash_added;
702
703 ether_addr_copy(search_claim.addr, mac);
704 search_claim.vid = vid;
705 claim = batadv_claim_hash_find(bat_priv, &search_claim);
706
707
708 if (!claim) {
709 claim = kzalloc(sizeof(*claim), GFP_ATOMIC);
710 if (!claim)
711 return;
712
713 ether_addr_copy(claim->addr, mac);
714 spin_lock_init(&claim->backbone_lock);
715 claim->vid = vid;
716 claim->lasttime = jiffies;
717 kref_get(&backbone_gw->refcount);
718 claim->backbone_gw = backbone_gw;
719 kref_init(&claim->refcount);
720
721 batadv_dbg(BATADV_DBG_BLA, bat_priv,
722 "bla_add_claim(): adding new entry %pM, vid %d to hash ...\n",
723 mac, BATADV_PRINT_VID(vid));
724
725 kref_get(&claim->refcount);
726 hash_added = batadv_hash_add(bat_priv->bla.claim_hash,
727 batadv_compare_claim,
728 batadv_choose_claim, claim,
729 &claim->hash_entry);
730
731 if (unlikely(hash_added != 0)) {
732
733 kfree(claim);
734 return;
735 }
736 } else {
737 claim->lasttime = jiffies;
738 if (claim->backbone_gw == backbone_gw)
739
740 goto claim_free_ref;
741
742 batadv_dbg(BATADV_DBG_BLA, bat_priv,
743 "bla_add_claim(): changing ownership for %pM, vid %d\n",
744 mac, BATADV_PRINT_VID(vid));
745
746 remove_crc = true;
747 }
748
749
750 spin_lock_bh(&claim->backbone_lock);
751 old_backbone_gw = claim->backbone_gw;
752 kref_get(&backbone_gw->refcount);
753 claim->backbone_gw = backbone_gw;
754 spin_unlock_bh(&claim->backbone_lock);
755
756 if (remove_crc) {
757
758 spin_lock_bh(&old_backbone_gw->crc_lock);
759 old_backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
760 spin_unlock_bh(&old_backbone_gw->crc_lock);
761 }
762
763 batadv_backbone_gw_put(old_backbone_gw);
764
765
766 spin_lock_bh(&backbone_gw->crc_lock);
767 backbone_gw->crc ^= crc16(0, claim->addr, ETH_ALEN);
768 spin_unlock_bh(&backbone_gw->crc_lock);
769 backbone_gw->lasttime = jiffies;
770
771claim_free_ref:
772 batadv_claim_put(claim);
773}
774
775
776
777
778
779
780
781
782static struct batadv_bla_backbone_gw *
783batadv_bla_claim_get_backbone_gw(struct batadv_bla_claim *claim)
784{
785 struct batadv_bla_backbone_gw *backbone_gw;
786
787 spin_lock_bh(&claim->backbone_lock);
788 backbone_gw = claim->backbone_gw;
789 kref_get(&backbone_gw->refcount);
790 spin_unlock_bh(&claim->backbone_lock);
791
792 return backbone_gw;
793}
794
795
796
797
798
799
800
801static void batadv_bla_del_claim(struct batadv_priv *bat_priv,
802 const u8 *mac, const unsigned short vid)
803{
804 struct batadv_bla_claim search_claim, *claim;
805
806 ether_addr_copy(search_claim.addr, mac);
807 search_claim.vid = vid;
808 claim = batadv_claim_hash_find(bat_priv, &search_claim);
809 if (!claim)
810 return;
811
812 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla_del_claim(): %pM, vid %d\n",
813 mac, BATADV_PRINT_VID(vid));
814
815 batadv_hash_remove(bat_priv->bla.claim_hash, batadv_compare_claim,
816 batadv_choose_claim, claim);
817 batadv_claim_put(claim);
818
819
820 batadv_claim_put(claim);
821}
822
823
824
825
826
827
828
829
830
831
832static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
833 u8 *backbone_addr, unsigned short vid)
834{
835 struct batadv_bla_backbone_gw *backbone_gw;
836 u16 backbone_crc, crc;
837
838 if (memcmp(an_addr, batadv_announce_mac, 4) != 0)
839 return false;
840
841 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
842 false);
843
844 if (unlikely(!backbone_gw))
845 return true;
846
847
848 backbone_gw->lasttime = jiffies;
849 crc = ntohs(*((__be16 *)(&an_addr[4])));
850
851 batadv_dbg(BATADV_DBG_BLA, bat_priv,
852 "handle_announce(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
853 BATADV_PRINT_VID(vid), backbone_gw->orig, crc);
854
855 spin_lock_bh(&backbone_gw->crc_lock);
856 backbone_crc = backbone_gw->crc;
857 spin_unlock_bh(&backbone_gw->crc_lock);
858
859 if (backbone_crc != crc) {
860 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
861 "handle_announce(): CRC FAILED for %pM/%d (my = %#.4x, sent = %#.4x)\n",
862 backbone_gw->orig,
863 BATADV_PRINT_VID(backbone_gw->vid),
864 backbone_crc, crc);
865
866 batadv_bla_send_request(backbone_gw);
867 } else {
868
869
870
871 if (atomic_read(&backbone_gw->request_sent)) {
872 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
873 atomic_set(&backbone_gw->request_sent, 0);
874 }
875 }
876
877 batadv_backbone_gw_put(backbone_gw);
878 return true;
879}
880
881
882
883
884
885
886
887
888
889
890
891static bool batadv_handle_request(struct batadv_priv *bat_priv,
892 struct batadv_hard_iface *primary_if,
893 u8 *backbone_addr, struct ethhdr *ethhdr,
894 unsigned short vid)
895{
896
897 if (!batadv_compare_eth(backbone_addr, ethhdr->h_dest))
898 return false;
899
900
901
902
903 if (!batadv_compare_eth(ethhdr->h_dest, primary_if->net_dev->dev_addr))
904 return true;
905
906 batadv_dbg(BATADV_DBG_BLA, bat_priv,
907 "handle_request(): REQUEST vid %d (sent by %pM)...\n",
908 BATADV_PRINT_VID(vid), ethhdr->h_source);
909
910 batadv_bla_answer_request(bat_priv, primary_if, vid);
911 return true;
912}
913
914
915
916
917
918
919
920
921
922
923
924static bool batadv_handle_unclaim(struct batadv_priv *bat_priv,
925 struct batadv_hard_iface *primary_if,
926 u8 *backbone_addr, u8 *claim_addr,
927 unsigned short vid)
928{
929 struct batadv_bla_backbone_gw *backbone_gw;
930
931
932 if (primary_if && batadv_compare_eth(backbone_addr,
933 primary_if->net_dev->dev_addr))
934 batadv_bla_send_claim(bat_priv, claim_addr, vid,
935 BATADV_CLAIM_TYPE_UNCLAIM);
936
937 backbone_gw = batadv_backbone_hash_find(bat_priv, backbone_addr, vid);
938
939 if (!backbone_gw)
940 return true;
941
942
943 batadv_dbg(BATADV_DBG_BLA, bat_priv,
944 "handle_unclaim(): UNCLAIM %pM on vid %d (sent by %pM)...\n",
945 claim_addr, BATADV_PRINT_VID(vid), backbone_gw->orig);
946
947 batadv_bla_del_claim(bat_priv, claim_addr, vid);
948 batadv_backbone_gw_put(backbone_gw);
949 return true;
950}
951
952
953
954
955
956
957
958
959
960
961
962static bool batadv_handle_claim(struct batadv_priv *bat_priv,
963 struct batadv_hard_iface *primary_if,
964 u8 *backbone_addr, u8 *claim_addr,
965 unsigned short vid)
966{
967 struct batadv_bla_backbone_gw *backbone_gw;
968
969
970
971 backbone_gw = batadv_bla_get_backbone_gw(bat_priv, backbone_addr, vid,
972 false);
973
974 if (unlikely(!backbone_gw))
975 return true;
976
977
978 batadv_bla_add_claim(bat_priv, claim_addr, vid, backbone_gw);
979 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
980 batadv_bla_send_claim(bat_priv, claim_addr, vid,
981 BATADV_CLAIM_TYPE_CLAIM);
982
983
984
985 batadv_backbone_gw_put(backbone_gw);
986 return true;
987}
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006static int batadv_check_claim_group(struct batadv_priv *bat_priv,
1007 struct batadv_hard_iface *primary_if,
1008 u8 *hw_src, u8 *hw_dst,
1009 struct ethhdr *ethhdr)
1010{
1011 u8 *backbone_addr;
1012 struct batadv_orig_node *orig_node;
1013 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1014
1015 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1016 bla_dst_own = &bat_priv->bla.claim_dest;
1017
1018
1019
1020
1021 switch (bla_dst->type) {
1022 case BATADV_CLAIM_TYPE_CLAIM:
1023 backbone_addr = hw_src;
1024 break;
1025 case BATADV_CLAIM_TYPE_REQUEST:
1026 case BATADV_CLAIM_TYPE_ANNOUNCE:
1027 case BATADV_CLAIM_TYPE_UNCLAIM:
1028 backbone_addr = ethhdr->h_source;
1029 break;
1030 default:
1031 return 0;
1032 }
1033
1034
1035 if (batadv_compare_eth(backbone_addr, primary_if->net_dev->dev_addr))
1036 return 0;
1037
1038
1039 if (bla_dst->group == bla_dst_own->group)
1040 return 2;
1041
1042
1043 orig_node = batadv_orig_hash_find(bat_priv, backbone_addr);
1044
1045
1046
1047
1048 if (!orig_node)
1049 return 1;
1050
1051
1052 if (ntohs(bla_dst->group) > ntohs(bla_dst_own->group)) {
1053 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1054 "taking other backbones claim group: %#.4x\n",
1055 ntohs(bla_dst->group));
1056 bla_dst_own->group = bla_dst->group;
1057 }
1058
1059 batadv_orig_node_put(orig_node);
1060
1061 return 2;
1062}
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073static bool batadv_bla_process_claim(struct batadv_priv *bat_priv,
1074 struct batadv_hard_iface *primary_if,
1075 struct sk_buff *skb)
1076{
1077 struct batadv_bla_claim_dst *bla_dst, *bla_dst_own;
1078 u8 *hw_src, *hw_dst;
1079 struct vlan_hdr *vhdr, vhdr_buf;
1080 struct ethhdr *ethhdr;
1081 struct arphdr *arphdr;
1082 unsigned short vid;
1083 int vlan_depth = 0;
1084 __be16 proto;
1085 int headlen;
1086 int ret;
1087
1088 vid = batadv_get_vid(skb, 0);
1089 ethhdr = eth_hdr(skb);
1090
1091 proto = ethhdr->h_proto;
1092 headlen = ETH_HLEN;
1093 if (vid & BATADV_VLAN_HAS_TAG) {
1094
1095
1096
1097
1098
1099
1100
1101
1102 do {
1103 vhdr = skb_header_pointer(skb, headlen, VLAN_HLEN,
1104 &vhdr_buf);
1105 if (!vhdr)
1106 return false;
1107
1108 proto = vhdr->h_vlan_encapsulated_proto;
1109 headlen += VLAN_HLEN;
1110 vlan_depth++;
1111 } while (proto == htons(ETH_P_8021Q));
1112 }
1113
1114 if (proto != htons(ETH_P_ARP))
1115 return false;
1116
1117
1118
1119 if (unlikely(!pskb_may_pull(skb, headlen + arp_hdr_len(skb->dev))))
1120 return false;
1121
1122
1123 ethhdr = eth_hdr(skb);
1124 arphdr = (struct arphdr *)((u8 *)ethhdr + headlen);
1125
1126
1127
1128
1129 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
1130 return false;
1131 if (arphdr->ar_pro != htons(ETH_P_IP))
1132 return false;
1133 if (arphdr->ar_hln != ETH_ALEN)
1134 return false;
1135 if (arphdr->ar_pln != 4)
1136 return false;
1137
1138 hw_src = (u8 *)arphdr + sizeof(struct arphdr);
1139 hw_dst = hw_src + ETH_ALEN + 4;
1140 bla_dst = (struct batadv_bla_claim_dst *)hw_dst;
1141 bla_dst_own = &bat_priv->bla.claim_dest;
1142
1143
1144 if (memcmp(bla_dst->magic, bla_dst_own->magic,
1145 sizeof(bla_dst->magic)) != 0)
1146 return false;
1147
1148
1149
1150
1151
1152 if (vlan_depth > 1)
1153 return true;
1154
1155
1156 if (bla_dst->type == BATADV_CLAIM_TYPE_LOOPDETECT)
1157 return false;
1158
1159
1160 ret = batadv_check_claim_group(bat_priv, primary_if, hw_src, hw_dst,
1161 ethhdr);
1162 if (ret == 1)
1163 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1164 "bla_process_claim(): received a claim frame from another group. From: %pM on vid %d ...(hw_src %pM, hw_dst %pM)\n",
1165 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src,
1166 hw_dst);
1167
1168 if (ret < 2)
1169 return !!ret;
1170
1171
1172 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1173
1174
1175 switch (bla_dst->type) {
1176 case BATADV_CLAIM_TYPE_CLAIM:
1177 if (batadv_handle_claim(bat_priv, primary_if, hw_src,
1178 ethhdr->h_source, vid))
1179 return true;
1180 break;
1181 case BATADV_CLAIM_TYPE_UNCLAIM:
1182 if (batadv_handle_unclaim(bat_priv, primary_if,
1183 ethhdr->h_source, hw_src, vid))
1184 return true;
1185 break;
1186
1187 case BATADV_CLAIM_TYPE_ANNOUNCE:
1188 if (batadv_handle_announce(bat_priv, hw_src, ethhdr->h_source,
1189 vid))
1190 return true;
1191 break;
1192 case BATADV_CLAIM_TYPE_REQUEST:
1193 if (batadv_handle_request(bat_priv, primary_if, hw_src, ethhdr,
1194 vid))
1195 return true;
1196 break;
1197 }
1198
1199 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1200 "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",
1201 ethhdr->h_source, BATADV_PRINT_VID(vid), hw_src, hw_dst);
1202 return true;
1203}
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now)
1215{
1216 struct batadv_bla_backbone_gw *backbone_gw;
1217 struct hlist_node *node_tmp;
1218 struct hlist_head *head;
1219 struct batadv_hashtable *hash;
1220 spinlock_t *list_lock;
1221 int i;
1222
1223 hash = bat_priv->bla.backbone_hash;
1224 if (!hash)
1225 return;
1226
1227 for (i = 0; i < hash->size; i++) {
1228 head = &hash->table[i];
1229 list_lock = &hash->list_locks[i];
1230
1231 spin_lock_bh(list_lock);
1232 hlist_for_each_entry_safe(backbone_gw, node_tmp,
1233 head, hash_entry) {
1234 if (now)
1235 goto purge_now;
1236 if (!batadv_has_timed_out(backbone_gw->lasttime,
1237 BATADV_BLA_BACKBONE_TIMEOUT))
1238 continue;
1239
1240 batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
1241 "bla_purge_backbone_gw(): backbone gw %pM timed out\n",
1242 backbone_gw->orig);
1243
1244purge_now:
1245
1246 if (atomic_read(&backbone_gw->request_sent))
1247 atomic_dec(&bat_priv->bla.num_requests);
1248
1249 batadv_bla_del_backbone_claims(backbone_gw);
1250
1251 hlist_del_rcu(&backbone_gw->hash_entry);
1252 batadv_backbone_gw_put(backbone_gw);
1253 }
1254 spin_unlock_bh(list_lock);
1255 }
1256}
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267static void batadv_bla_purge_claims(struct batadv_priv *bat_priv,
1268 struct batadv_hard_iface *primary_if,
1269 int now)
1270{
1271 struct batadv_bla_backbone_gw *backbone_gw;
1272 struct batadv_bla_claim *claim;
1273 struct hlist_head *head;
1274 struct batadv_hashtable *hash;
1275 int i;
1276
1277 hash = bat_priv->bla.claim_hash;
1278 if (!hash)
1279 return;
1280
1281 for (i = 0; i < hash->size; i++) {
1282 head = &hash->table[i];
1283
1284 rcu_read_lock();
1285 hlist_for_each_entry_rcu(claim, head, hash_entry) {
1286 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1287 if (now)
1288 goto purge_now;
1289
1290 if (!batadv_compare_eth(backbone_gw->orig,
1291 primary_if->net_dev->dev_addr))
1292 goto skip;
1293
1294 if (!batadv_has_timed_out(claim->lasttime,
1295 BATADV_BLA_CLAIM_TIMEOUT))
1296 goto skip;
1297
1298 batadv_dbg(BATADV_DBG_BLA, bat_priv,
1299 "bla_purge_claims(): %pM, vid %d, time out\n",
1300 claim->addr, claim->vid);
1301
1302purge_now:
1303 batadv_handle_unclaim(bat_priv, primary_if,
1304 backbone_gw->orig,
1305 claim->addr, claim->vid);
1306skip:
1307 batadv_backbone_gw_put(backbone_gw);
1308 }
1309 rcu_read_unlock();
1310 }
1311}
1312
1313
1314
1315
1316
1317
1318
1319
1320void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
1321 struct batadv_hard_iface *primary_if,
1322 struct batadv_hard_iface *oldif)
1323{
1324 struct batadv_bla_backbone_gw *backbone_gw;
1325 struct hlist_head *head;
1326 struct batadv_hashtable *hash;
1327 __be16 group;
1328 int i;
1329
1330
1331 group = htons(crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN));
1332 bat_priv->bla.claim_dest.group = group;
1333
1334
1335 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1336 oldif = NULL;
1337
1338 if (!oldif) {
1339 batadv_bla_purge_claims(bat_priv, NULL, 1);
1340 batadv_bla_purge_backbone_gw(bat_priv, 1);
1341 return;
1342 }
1343
1344 hash = bat_priv->bla.backbone_hash;
1345 if (!hash)
1346 return;
1347
1348 for (i = 0; i < hash->size; i++) {
1349 head = &hash->table[i];
1350
1351 rcu_read_lock();
1352 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1353
1354 if (!batadv_compare_eth(backbone_gw->orig,
1355 oldif->net_dev->dev_addr))
1356 continue;
1357
1358 ether_addr_copy(backbone_gw->orig,
1359 primary_if->net_dev->dev_addr);
1360
1361
1362
1363 batadv_bla_send_announce(bat_priv, backbone_gw);
1364 }
1365 rcu_read_unlock();
1366 }
1367}
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379static void
1380batadv_bla_send_loopdetect(struct batadv_priv *bat_priv,
1381 struct batadv_bla_backbone_gw *backbone_gw)
1382{
1383 batadv_dbg(BATADV_DBG_BLA, bat_priv, "Send loopdetect frame for vid %d\n",
1384 backbone_gw->vid);
1385 batadv_bla_send_claim(bat_priv, bat_priv->bla.loopdetect_addr,
1386 backbone_gw->vid, BATADV_CLAIM_TYPE_LOOPDETECT);
1387}
1388
1389
1390
1391
1392
1393void batadv_bla_status_update(struct net_device *net_dev)
1394{
1395 struct batadv_priv *bat_priv = netdev_priv(net_dev);
1396 struct batadv_hard_iface *primary_if;
1397
1398 primary_if = batadv_primary_if_get_selected(bat_priv);
1399 if (!primary_if)
1400 return;
1401
1402
1403
1404
1405 batadv_bla_update_orig_address(bat_priv, primary_if, primary_if);
1406 batadv_hardif_put(primary_if);
1407}
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417static void batadv_bla_periodic_work(struct work_struct *work)
1418{
1419 struct delayed_work *delayed_work;
1420 struct batadv_priv *bat_priv;
1421 struct batadv_priv_bla *priv_bla;
1422 struct hlist_head *head;
1423 struct batadv_bla_backbone_gw *backbone_gw;
1424 struct batadv_hashtable *hash;
1425 struct batadv_hard_iface *primary_if;
1426 bool send_loopdetect = false;
1427 int i;
1428
1429 delayed_work = to_delayed_work(work);
1430 priv_bla = container_of(delayed_work, struct batadv_priv_bla, work);
1431 bat_priv = container_of(priv_bla, struct batadv_priv, bla);
1432 primary_if = batadv_primary_if_get_selected(bat_priv);
1433 if (!primary_if)
1434 goto out;
1435
1436 batadv_bla_purge_claims(bat_priv, primary_if, 0);
1437 batadv_bla_purge_backbone_gw(bat_priv, 0);
1438
1439 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1440 goto out;
1441
1442 if (atomic_dec_and_test(&bat_priv->bla.loopdetect_next)) {
1443
1444
1445
1446
1447 random_ether_addr(bat_priv->bla.loopdetect_addr);
1448 bat_priv->bla.loopdetect_addr[0] = 0xba;
1449 bat_priv->bla.loopdetect_addr[1] = 0xbe;
1450 bat_priv->bla.loopdetect_lasttime = jiffies;
1451 atomic_set(&bat_priv->bla.loopdetect_next,
1452 BATADV_BLA_LOOPDETECT_PERIODS);
1453
1454
1455 send_loopdetect = true;
1456 }
1457
1458 hash = bat_priv->bla.backbone_hash;
1459 if (!hash)
1460 goto out;
1461
1462 for (i = 0; i < hash->size; i++) {
1463 head = &hash->table[i];
1464
1465 rcu_read_lock();
1466 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1467 if (!batadv_compare_eth(backbone_gw->orig,
1468 primary_if->net_dev->dev_addr))
1469 continue;
1470
1471 backbone_gw->lasttime = jiffies;
1472
1473 batadv_bla_send_announce(bat_priv, backbone_gw);
1474 if (send_loopdetect)
1475 batadv_bla_send_loopdetect(bat_priv,
1476 backbone_gw);
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487 if (atomic_read(&backbone_gw->request_sent) == 0)
1488 continue;
1489
1490 if (!atomic_dec_and_test(&backbone_gw->wait_periods))
1491 continue;
1492
1493 atomic_dec(&backbone_gw->bat_priv->bla.num_requests);
1494 atomic_set(&backbone_gw->request_sent, 0);
1495 }
1496 rcu_read_unlock();
1497 }
1498out:
1499 if (primary_if)
1500 batadv_hardif_put(primary_if);
1501
1502 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1503 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1504}
1505
1506
1507
1508
1509
1510
1511static struct lock_class_key batadv_claim_hash_lock_class_key;
1512static struct lock_class_key batadv_backbone_hash_lock_class_key;
1513
1514
1515
1516
1517
1518
1519
1520int batadv_bla_init(struct batadv_priv *bat_priv)
1521{
1522 int i;
1523 u8 claim_dest[ETH_ALEN] = {0xff, 0x43, 0x05, 0x00, 0x00, 0x00};
1524 struct batadv_hard_iface *primary_if;
1525 u16 crc;
1526 unsigned long entrytime;
1527
1528 spin_lock_init(&bat_priv->bla.bcast_duplist_lock);
1529
1530 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hash registering\n");
1531
1532
1533 memcpy(&bat_priv->bla.claim_dest.magic, claim_dest, 3);
1534 bat_priv->bla.claim_dest.type = 0;
1535 primary_if = batadv_primary_if_get_selected(bat_priv);
1536 if (primary_if) {
1537 crc = crc16(0, primary_if->net_dev->dev_addr, ETH_ALEN);
1538 bat_priv->bla.claim_dest.group = htons(crc);
1539 batadv_hardif_put(primary_if);
1540 } else {
1541 bat_priv->bla.claim_dest.group = 0;
1542 }
1543
1544
1545 entrytime = jiffies - msecs_to_jiffies(BATADV_DUPLIST_TIMEOUT);
1546 for (i = 0; i < BATADV_DUPLIST_SIZE; i++)
1547 bat_priv->bla.bcast_duplist[i].entrytime = entrytime;
1548 bat_priv->bla.bcast_duplist_curr = 0;
1549
1550 atomic_set(&bat_priv->bla.loopdetect_next,
1551 BATADV_BLA_LOOPDETECT_PERIODS);
1552
1553 if (bat_priv->bla.claim_hash)
1554 return 0;
1555
1556 bat_priv->bla.claim_hash = batadv_hash_new(128);
1557 bat_priv->bla.backbone_hash = batadv_hash_new(32);
1558
1559 if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash)
1560 return -ENOMEM;
1561
1562 batadv_hash_set_lock_class(bat_priv->bla.claim_hash,
1563 &batadv_claim_hash_lock_class_key);
1564 batadv_hash_set_lock_class(bat_priv->bla.backbone_hash,
1565 &batadv_backbone_hash_lock_class_key);
1566
1567 batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n");
1568
1569 INIT_DELAYED_WORK(&bat_priv->bla.work, batadv_bla_periodic_work);
1570
1571 queue_delayed_work(batadv_event_workqueue, &bat_priv->bla.work,
1572 msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH));
1573 return 0;
1574}
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
1593 struct sk_buff *skb)
1594{
1595 int i, curr;
1596 __be32 crc;
1597 struct batadv_bcast_packet *bcast_packet;
1598 struct batadv_bcast_duplist_entry *entry;
1599 bool ret = false;
1600
1601 bcast_packet = (struct batadv_bcast_packet *)skb->data;
1602
1603
1604 crc = batadv_skb_crc32(skb, (u8 *)(bcast_packet + 1));
1605
1606 spin_lock_bh(&bat_priv->bla.bcast_duplist_lock);
1607
1608 for (i = 0; i < BATADV_DUPLIST_SIZE; i++) {
1609 curr = (bat_priv->bla.bcast_duplist_curr + i);
1610 curr %= BATADV_DUPLIST_SIZE;
1611 entry = &bat_priv->bla.bcast_duplist[curr];
1612
1613
1614
1615
1616 if (batadv_has_timed_out(entry->entrytime,
1617 BATADV_DUPLIST_TIMEOUT))
1618 break;
1619
1620 if (entry->crc != crc)
1621 continue;
1622
1623 if (batadv_compare_eth(entry->orig, bcast_packet->orig))
1624 continue;
1625
1626
1627
1628
1629 ret = true;
1630 goto out;
1631 }
1632
1633
1634
1635 curr = (bat_priv->bla.bcast_duplist_curr + BATADV_DUPLIST_SIZE - 1);
1636 curr %= BATADV_DUPLIST_SIZE;
1637 entry = &bat_priv->bla.bcast_duplist[curr];
1638 entry->crc = crc;
1639 entry->entrytime = jiffies;
1640 ether_addr_copy(entry->orig, bcast_packet->orig);
1641 bat_priv->bla.bcast_duplist_curr = curr;
1642
1643out:
1644 spin_unlock_bh(&bat_priv->bla.bcast_duplist_lock);
1645
1646 return ret;
1647}
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
1659 unsigned short vid)
1660{
1661 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
1662 struct hlist_head *head;
1663 struct batadv_bla_backbone_gw *backbone_gw;
1664 int i;
1665
1666 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1667 return false;
1668
1669 if (!hash)
1670 return false;
1671
1672 for (i = 0; i < hash->size; i++) {
1673 head = &hash->table[i];
1674
1675 rcu_read_lock();
1676 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
1677 if (batadv_compare_eth(backbone_gw->orig, orig) &&
1678 backbone_gw->vid == vid) {
1679 rcu_read_unlock();
1680 return true;
1681 }
1682 }
1683 rcu_read_unlock();
1684 }
1685
1686 return false;
1687}
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
1699 struct batadv_orig_node *orig_node, int hdr_size)
1700{
1701 struct batadv_bla_backbone_gw *backbone_gw;
1702 unsigned short vid;
1703
1704 if (!atomic_read(&orig_node->bat_priv->bridge_loop_avoidance))
1705 return false;
1706
1707
1708 if (!pskb_may_pull(skb, hdr_size + ETH_HLEN))
1709 return false;
1710
1711 vid = batadv_get_vid(skb, hdr_size);
1712
1713
1714 backbone_gw = batadv_backbone_hash_find(orig_node->bat_priv,
1715 orig_node->orig, vid);
1716 if (!backbone_gw)
1717 return false;
1718
1719 batadv_backbone_gw_put(backbone_gw);
1720 return true;
1721}
1722
1723
1724
1725
1726
1727
1728
1729void batadv_bla_free(struct batadv_priv *bat_priv)
1730{
1731 struct batadv_hard_iface *primary_if;
1732
1733 cancel_delayed_work_sync(&bat_priv->bla.work);
1734 primary_if = batadv_primary_if_get_selected(bat_priv);
1735
1736 if (bat_priv->bla.claim_hash) {
1737 batadv_bla_purge_claims(bat_priv, primary_if, 1);
1738 batadv_hash_destroy(bat_priv->bla.claim_hash);
1739 bat_priv->bla.claim_hash = NULL;
1740 }
1741 if (bat_priv->bla.backbone_hash) {
1742 batadv_bla_purge_backbone_gw(bat_priv, 1);
1743 batadv_hash_destroy(bat_priv->bla.backbone_hash);
1744 bat_priv->bla.backbone_hash = NULL;
1745 }
1746 if (primary_if)
1747 batadv_hardif_put(primary_if);
1748}
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763static bool
1764batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
1765 struct batadv_hard_iface *primary_if,
1766 unsigned short vid)
1767{
1768 struct batadv_bla_backbone_gw *backbone_gw;
1769 struct ethhdr *ethhdr;
1770
1771 ethhdr = eth_hdr(skb);
1772
1773
1774
1775
1776 if (!batadv_compare_eth(ethhdr->h_source,
1777 bat_priv->bla.loopdetect_addr))
1778 return false;
1779
1780
1781
1782
1783 if (batadv_has_timed_out(bat_priv->bla.loopdetect_lasttime,
1784 BATADV_BLA_LOOPDETECT_TIMEOUT))
1785 return true;
1786
1787 backbone_gw = batadv_bla_get_backbone_gw(bat_priv,
1788 primary_if->net_dev->dev_addr,
1789 vid, true);
1790 if (unlikely(!backbone_gw))
1791 return true;
1792
1793 queue_work(batadv_event_workqueue, &backbone_gw->report_work);
1794
1795
1796 return true;
1797}
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1816 unsigned short vid, bool is_bcast)
1817{
1818 struct batadv_bla_backbone_gw *backbone_gw;
1819 struct ethhdr *ethhdr;
1820 struct batadv_bla_claim search_claim, *claim = NULL;
1821 struct batadv_hard_iface *primary_if;
1822 bool own_claim;
1823 bool ret;
1824
1825 ethhdr = eth_hdr(skb);
1826
1827 primary_if = batadv_primary_if_get_selected(bat_priv);
1828 if (!primary_if)
1829 goto handled;
1830
1831 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1832 goto allow;
1833
1834 if (batadv_bla_loopdetect_check(bat_priv, skb, primary_if, vid))
1835 goto handled;
1836
1837 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1838
1839 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast)
1840 goto handled;
1841
1842 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1843 search_claim.vid = vid;
1844 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1845
1846 if (!claim) {
1847
1848
1849
1850 batadv_handle_claim(bat_priv, primary_if,
1851 primary_if->net_dev->dev_addr,
1852 ethhdr->h_source, vid);
1853 goto allow;
1854 }
1855
1856
1857 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1858 own_claim = batadv_compare_eth(backbone_gw->orig,
1859 primary_if->net_dev->dev_addr);
1860 batadv_backbone_gw_put(backbone_gw);
1861
1862 if (own_claim) {
1863
1864 claim->lasttime = jiffies;
1865 goto allow;
1866 }
1867
1868
1869 if (is_multicast_ether_addr(ethhdr->h_dest) && is_bcast) {
1870
1871
1872
1873
1874
1875
1876 goto handled;
1877 } else {
1878
1879
1880
1881
1882 batadv_handle_claim(bat_priv, primary_if,
1883 primary_if->net_dev->dev_addr,
1884 ethhdr->h_source, vid);
1885 goto allow;
1886 }
1887allow:
1888 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1889 ret = false;
1890 goto out;
1891
1892handled:
1893 kfree_skb(skb);
1894 ret = true;
1895
1896out:
1897 if (primary_if)
1898 batadv_hardif_put(primary_if);
1899 if (claim)
1900 batadv_claim_put(claim);
1901 return ret;
1902}
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
1922 unsigned short vid)
1923{
1924 struct ethhdr *ethhdr;
1925 struct batadv_bla_claim search_claim, *claim = NULL;
1926 struct batadv_bla_backbone_gw *backbone_gw;
1927 struct batadv_hard_iface *primary_if;
1928 bool client_roamed;
1929 bool ret = false;
1930
1931 primary_if = batadv_primary_if_get_selected(bat_priv);
1932 if (!primary_if)
1933 goto out;
1934
1935 if (!atomic_read(&bat_priv->bridge_loop_avoidance))
1936 goto allow;
1937
1938 if (batadv_bla_process_claim(bat_priv, primary_if, skb))
1939 goto handled;
1940
1941 ethhdr = eth_hdr(skb);
1942
1943 if (unlikely(atomic_read(&bat_priv->bla.num_requests)))
1944
1945 if (is_multicast_ether_addr(ethhdr->h_dest))
1946 goto handled;
1947
1948 ether_addr_copy(search_claim.addr, ethhdr->h_source);
1949 search_claim.vid = vid;
1950
1951 claim = batadv_claim_hash_find(bat_priv, &search_claim);
1952
1953
1954 if (!claim)
1955 goto allow;
1956
1957
1958 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
1959 client_roamed = batadv_compare_eth(backbone_gw->orig,
1960 primary_if->net_dev->dev_addr);
1961 batadv_backbone_gw_put(backbone_gw);
1962
1963 if (client_roamed) {
1964
1965
1966
1967 batadv_handle_unclaim(bat_priv, primary_if,
1968 primary_if->net_dev->dev_addr,
1969 ethhdr->h_source, vid);
1970 goto allow;
1971 }
1972
1973
1974 if (is_multicast_ether_addr(ethhdr->h_dest)) {
1975
1976
1977
1978 goto handled;
1979 } else {
1980
1981
1982
1983 goto allow;
1984 }
1985allow:
1986 batadv_bla_update_own_backbone_gw(bat_priv, primary_if, vid);
1987 ret = false;
1988 goto out;
1989handled:
1990 ret = true;
1991out:
1992 if (primary_if)
1993 batadv_hardif_put(primary_if);
1994 if (claim)
1995 batadv_claim_put(claim);
1996 return ret;
1997}
1998
1999#ifdef CONFIG_BATMAN_ADV_DEBUGFS
2000
2001
2002
2003
2004
2005
2006
2007int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset)
2008{
2009 struct net_device *net_dev = (struct net_device *)seq->private;
2010 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2011 struct batadv_hashtable *hash = bat_priv->bla.claim_hash;
2012 struct batadv_bla_backbone_gw *backbone_gw;
2013 struct batadv_bla_claim *claim;
2014 struct batadv_hard_iface *primary_if;
2015 struct hlist_head *head;
2016 u16 backbone_crc;
2017 u32 i;
2018 bool is_own;
2019 u8 *primary_addr;
2020
2021 primary_if = batadv_seq_print_text_primary_if_get(seq);
2022 if (!primary_if)
2023 goto out;
2024
2025 primary_addr = primary_if->net_dev->dev_addr;
2026 seq_printf(seq,
2027 "Claims announced for the mesh %s (orig %pM, group id %#.4x)\n",
2028 net_dev->name, primary_addr,
2029 ntohs(bat_priv->bla.claim_dest.group));
2030 seq_puts(seq,
2031 " Client VID Originator [o] (CRC )\n");
2032 for (i = 0; i < hash->size; i++) {
2033 head = &hash->table[i];
2034
2035 rcu_read_lock();
2036 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2037 backbone_gw = batadv_bla_claim_get_backbone_gw(claim);
2038
2039 is_own = batadv_compare_eth(backbone_gw->orig,
2040 primary_addr);
2041
2042 spin_lock_bh(&backbone_gw->crc_lock);
2043 backbone_crc = backbone_gw->crc;
2044 spin_unlock_bh(&backbone_gw->crc_lock);
2045 seq_printf(seq, " * %pM on %5d by %pM [%c] (%#.4x)\n",
2046 claim->addr, BATADV_PRINT_VID(claim->vid),
2047 backbone_gw->orig,
2048 (is_own ? 'x' : ' '),
2049 backbone_crc);
2050
2051 batadv_backbone_gw_put(backbone_gw);
2052 }
2053 rcu_read_unlock();
2054 }
2055out:
2056 if (primary_if)
2057 batadv_hardif_put(primary_if);
2058 return 0;
2059}
2060#endif
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073static int
2074batadv_bla_claim_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2075 struct batadv_hard_iface *primary_if,
2076 struct batadv_bla_claim *claim)
2077{
2078 u8 *primary_addr = primary_if->net_dev->dev_addr;
2079 u16 backbone_crc;
2080 bool is_own;
2081 void *hdr;
2082 int ret = -EINVAL;
2083
2084 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2085 NLM_F_MULTI, BATADV_CMD_GET_BLA_CLAIM);
2086 if (!hdr) {
2087 ret = -ENOBUFS;
2088 goto out;
2089 }
2090
2091 is_own = batadv_compare_eth(claim->backbone_gw->orig,
2092 primary_addr);
2093
2094 spin_lock_bh(&claim->backbone_gw->crc_lock);
2095 backbone_crc = claim->backbone_gw->crc;
2096 spin_unlock_bh(&claim->backbone_gw->crc_lock);
2097
2098 if (is_own)
2099 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2100 genlmsg_cancel(msg, hdr);
2101 goto out;
2102 }
2103
2104 if (nla_put(msg, BATADV_ATTR_BLA_ADDRESS, ETH_ALEN, claim->addr) ||
2105 nla_put_u16(msg, BATADV_ATTR_BLA_VID, claim->vid) ||
2106 nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2107 claim->backbone_gw->orig) ||
2108 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2109 backbone_crc)) {
2110 genlmsg_cancel(msg, hdr);
2111 goto out;
2112 }
2113
2114 genlmsg_end(msg, hdr);
2115 ret = 0;
2116
2117out:
2118 return ret;
2119}
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133static int
2134batadv_bla_claim_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2135 struct batadv_hard_iface *primary_if,
2136 struct hlist_head *head, int *idx_skip)
2137{
2138 struct batadv_bla_claim *claim;
2139 int idx = 0;
2140
2141 rcu_read_lock();
2142 hlist_for_each_entry_rcu(claim, head, hash_entry) {
2143 if (idx++ < *idx_skip)
2144 continue;
2145 if (batadv_bla_claim_dump_entry(msg, portid, seq,
2146 primary_if, claim)) {
2147 *idx_skip = idx - 1;
2148 goto unlock;
2149 }
2150 }
2151
2152 *idx_skip = idx;
2153unlock:
2154 rcu_read_unlock();
2155 return 0;
2156}
2157
2158
2159
2160
2161
2162
2163
2164
2165int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb)
2166{
2167 struct batadv_hard_iface *primary_if = NULL;
2168 int portid = NETLINK_CB(cb->skb).portid;
2169 struct net *net = sock_net(cb->skb->sk);
2170 struct net_device *soft_iface;
2171 struct batadv_hashtable *hash;
2172 struct batadv_priv *bat_priv;
2173 int bucket = cb->args[0];
2174 struct hlist_head *head;
2175 int idx = cb->args[1];
2176 int ifindex;
2177 int ret = 0;
2178
2179 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2180 BATADV_ATTR_MESH_IFINDEX);
2181 if (!ifindex)
2182 return -EINVAL;
2183
2184 soft_iface = dev_get_by_index(net, ifindex);
2185 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2186 ret = -ENODEV;
2187 goto out;
2188 }
2189
2190 bat_priv = netdev_priv(soft_iface);
2191 hash = bat_priv->bla.claim_hash;
2192
2193 primary_if = batadv_primary_if_get_selected(bat_priv);
2194 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2195 ret = -ENOENT;
2196 goto out;
2197 }
2198
2199 while (bucket < hash->size) {
2200 head = &hash->table[bucket];
2201
2202 if (batadv_bla_claim_dump_bucket(msg, portid,
2203 cb->nlh->nlmsg_seq,
2204 primary_if, head, &idx))
2205 break;
2206 bucket++;
2207 }
2208
2209 cb->args[0] = bucket;
2210 cb->args[1] = idx;
2211
2212 ret = msg->len;
2213
2214out:
2215 if (primary_if)
2216 batadv_hardif_put(primary_if);
2217
2218 if (soft_iface)
2219 dev_put(soft_iface);
2220
2221 return ret;
2222}
2223
2224#ifdef CONFIG_BATMAN_ADV_DEBUGFS
2225
2226
2227
2228
2229
2230
2231
2232
2233int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset)
2234{
2235 struct net_device *net_dev = (struct net_device *)seq->private;
2236 struct batadv_priv *bat_priv = netdev_priv(net_dev);
2237 struct batadv_hashtable *hash = bat_priv->bla.backbone_hash;
2238 struct batadv_bla_backbone_gw *backbone_gw;
2239 struct batadv_hard_iface *primary_if;
2240 struct hlist_head *head;
2241 int secs, msecs;
2242 u16 backbone_crc;
2243 u32 i;
2244 bool is_own;
2245 u8 *primary_addr;
2246
2247 primary_if = batadv_seq_print_text_primary_if_get(seq);
2248 if (!primary_if)
2249 goto out;
2250
2251 primary_addr = primary_if->net_dev->dev_addr;
2252 seq_printf(seq,
2253 "Backbones announced for the mesh %s (orig %pM, group id %#.4x)\n",
2254 net_dev->name, primary_addr,
2255 ntohs(bat_priv->bla.claim_dest.group));
2256 seq_puts(seq, " Originator VID last seen (CRC )\n");
2257 for (i = 0; i < hash->size; i++) {
2258 head = &hash->table[i];
2259
2260 rcu_read_lock();
2261 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2262 msecs = jiffies_to_msecs(jiffies -
2263 backbone_gw->lasttime);
2264 secs = msecs / 1000;
2265 msecs = msecs % 1000;
2266
2267 is_own = batadv_compare_eth(backbone_gw->orig,
2268 primary_addr);
2269 if (is_own)
2270 continue;
2271
2272 spin_lock_bh(&backbone_gw->crc_lock);
2273 backbone_crc = backbone_gw->crc;
2274 spin_unlock_bh(&backbone_gw->crc_lock);
2275
2276 seq_printf(seq, " * %pM on %5d %4i.%03is (%#.4x)\n",
2277 backbone_gw->orig,
2278 BATADV_PRINT_VID(backbone_gw->vid), secs,
2279 msecs, backbone_crc);
2280 }
2281 rcu_read_unlock();
2282 }
2283out:
2284 if (primary_if)
2285 batadv_hardif_put(primary_if);
2286 return 0;
2287}
2288#endif
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301static int
2302batadv_bla_backbone_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
2303 struct batadv_hard_iface *primary_if,
2304 struct batadv_bla_backbone_gw *backbone_gw)
2305{
2306 u8 *primary_addr = primary_if->net_dev->dev_addr;
2307 u16 backbone_crc;
2308 bool is_own;
2309 int msecs;
2310 void *hdr;
2311 int ret = -EINVAL;
2312
2313 hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
2314 NLM_F_MULTI, BATADV_CMD_GET_BLA_BACKBONE);
2315 if (!hdr) {
2316 ret = -ENOBUFS;
2317 goto out;
2318 }
2319
2320 is_own = batadv_compare_eth(backbone_gw->orig, primary_addr);
2321
2322 spin_lock_bh(&backbone_gw->crc_lock);
2323 backbone_crc = backbone_gw->crc;
2324 spin_unlock_bh(&backbone_gw->crc_lock);
2325
2326 msecs = jiffies_to_msecs(jiffies - backbone_gw->lasttime);
2327
2328 if (is_own)
2329 if (nla_put_flag(msg, BATADV_ATTR_BLA_OWN)) {
2330 genlmsg_cancel(msg, hdr);
2331 goto out;
2332 }
2333
2334 if (nla_put(msg, BATADV_ATTR_BLA_BACKBONE, ETH_ALEN,
2335 backbone_gw->orig) ||
2336 nla_put_u16(msg, BATADV_ATTR_BLA_VID, backbone_gw->vid) ||
2337 nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
2338 backbone_crc) ||
2339 nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) {
2340 genlmsg_cancel(msg, hdr);
2341 goto out;
2342 }
2343
2344 genlmsg_end(msg, hdr);
2345 ret = 0;
2346
2347out:
2348 return ret;
2349}
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363static int
2364batadv_bla_backbone_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
2365 struct batadv_hard_iface *primary_if,
2366 struct hlist_head *head, int *idx_skip)
2367{
2368 struct batadv_bla_backbone_gw *backbone_gw;
2369 int idx = 0;
2370
2371 rcu_read_lock();
2372 hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) {
2373 if (idx++ < *idx_skip)
2374 continue;
2375 if (batadv_bla_backbone_dump_entry(msg, portid, seq,
2376 primary_if, backbone_gw)) {
2377 *idx_skip = idx - 1;
2378 goto unlock;
2379 }
2380 }
2381
2382 *idx_skip = idx;
2383unlock:
2384 rcu_read_unlock();
2385 return 0;
2386}
2387
2388
2389
2390
2391
2392
2393
2394
2395int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb)
2396{
2397 struct batadv_hard_iface *primary_if = NULL;
2398 int portid = NETLINK_CB(cb->skb).portid;
2399 struct net *net = sock_net(cb->skb->sk);
2400 struct net_device *soft_iface;
2401 struct batadv_hashtable *hash;
2402 struct batadv_priv *bat_priv;
2403 int bucket = cb->args[0];
2404 struct hlist_head *head;
2405 int idx = cb->args[1];
2406 int ifindex;
2407 int ret = 0;
2408
2409 ifindex = batadv_netlink_get_ifindex(cb->nlh,
2410 BATADV_ATTR_MESH_IFINDEX);
2411 if (!ifindex)
2412 return -EINVAL;
2413
2414 soft_iface = dev_get_by_index(net, ifindex);
2415 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
2416 ret = -ENODEV;
2417 goto out;
2418 }
2419
2420 bat_priv = netdev_priv(soft_iface);
2421 hash = bat_priv->bla.backbone_hash;
2422
2423 primary_if = batadv_primary_if_get_selected(bat_priv);
2424 if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
2425 ret = -ENOENT;
2426 goto out;
2427 }
2428
2429 while (bucket < hash->size) {
2430 head = &hash->table[bucket];
2431
2432 if (batadv_bla_backbone_dump_bucket(msg, portid,
2433 cb->nlh->nlmsg_seq,
2434 primary_if, head, &idx))
2435 break;
2436 bucket++;
2437 }
2438
2439 cb->args[0] = bucket;
2440 cb->args[1] = idx;
2441
2442 ret = msg->len;
2443
2444out:
2445 if (primary_if)
2446 batadv_hardif_put(primary_if);
2447
2448 if (soft_iface)
2449 dev_put(soft_iface);
2450
2451 return ret;
2452}
2453