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18#include <linux/if_ether.h>
19#include <linux/if_arp.h>
20#include <linux/if_vlan.h>
21#include <net/arp.h>
22
23#include "main.h"
24#include "hash.h"
25#include "distributed-arp-table.h"
26#include "hard-interface.h"
27#include "originator.h"
28#include "send.h"
29#include "types.h"
30#include "translation-table.h"
31
32static void batadv_dat_purge(struct work_struct *work);
33
34
35
36
37
38static void batadv_dat_start_timer(struct batadv_priv *bat_priv)
39{
40 INIT_DELAYED_WORK(&bat_priv->dat.work, batadv_dat_purge);
41 queue_delayed_work(batadv_event_workqueue, &bat_priv->dat.work,
42 msecs_to_jiffies(10000));
43}
44
45
46
47
48
49
50static void batadv_dat_entry_free_ref(struct batadv_dat_entry *dat_entry)
51{
52 if (atomic_dec_and_test(&dat_entry->refcount))
53 kfree_rcu(dat_entry, rcu);
54}
55
56
57
58
59
60
61
62static bool batadv_dat_to_purge(struct batadv_dat_entry *dat_entry)
63{
64 return batadv_has_timed_out(dat_entry->last_update,
65 BATADV_DAT_ENTRY_TIMEOUT);
66}
67
68
69
70
71
72
73
74
75
76
77
78
79static void __batadv_dat_purge(struct batadv_priv *bat_priv,
80 bool (*to_purge)(struct batadv_dat_entry *))
81{
82 spinlock_t *list_lock;
83 struct batadv_dat_entry *dat_entry;
84 struct hlist_node *node_tmp;
85 struct hlist_head *head;
86 uint32_t i;
87
88 if (!bat_priv->dat.hash)
89 return;
90
91 for (i = 0; i < bat_priv->dat.hash->size; i++) {
92 head = &bat_priv->dat.hash->table[i];
93 list_lock = &bat_priv->dat.hash->list_locks[i];
94
95 spin_lock_bh(list_lock);
96 hlist_for_each_entry_safe(dat_entry, node_tmp, head,
97 hash_entry) {
98
99
100
101 if (to_purge && !to_purge(dat_entry))
102 continue;
103
104 hlist_del_rcu(&dat_entry->hash_entry);
105 batadv_dat_entry_free_ref(dat_entry);
106 }
107 spin_unlock_bh(list_lock);
108 }
109}
110
111
112
113
114
115
116static void batadv_dat_purge(struct work_struct *work)
117{
118 struct delayed_work *delayed_work;
119 struct batadv_priv_dat *priv_dat;
120 struct batadv_priv *bat_priv;
121
122 delayed_work = container_of(work, struct delayed_work, work);
123 priv_dat = container_of(delayed_work, struct batadv_priv_dat, work);
124 bat_priv = container_of(priv_dat, struct batadv_priv, dat);
125
126 __batadv_dat_purge(bat_priv, batadv_dat_to_purge);
127 batadv_dat_start_timer(bat_priv);
128}
129
130
131
132
133
134
135
136
137static int batadv_compare_dat(const struct hlist_node *node, const void *data2)
138{
139 const void *data1 = container_of(node, struct batadv_dat_entry,
140 hash_entry);
141
142 return memcmp(data1, data2, sizeof(__be32)) == 0 ? 1 : 0;
143}
144
145
146
147
148
149
150
151
152static uint8_t *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size)
153{
154 uint8_t *addr;
155
156 addr = (uint8_t *)(skb->data + hdr_size);
157 addr += ETH_HLEN + sizeof(struct arphdr);
158
159 return addr;
160}
161
162
163
164
165
166
167
168
169static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size)
170{
171 return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN);
172}
173
174
175
176
177
178
179
180
181static uint8_t *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size)
182{
183 return batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN + 4;
184}
185
186
187
188
189
190
191
192
193static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size)
194{
195 return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4);
196}
197
198
199
200
201
202
203
204
205static uint32_t batadv_hash_dat(const void *data, uint32_t size)
206{
207 uint32_t hash = 0;
208 const struct batadv_dat_entry *dat = data;
209
210 hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip));
211 hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid));
212
213 hash += (hash << 3);
214 hash ^= (hash >> 11);
215 hash += (hash << 15);
216
217 return hash % size;
218}
219
220
221
222
223
224
225
226
227
228
229static struct batadv_dat_entry *
230batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip,
231 unsigned short vid)
232{
233 struct hlist_head *head;
234 struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL;
235 struct batadv_hashtable *hash = bat_priv->dat.hash;
236 uint32_t index;
237
238 if (!hash)
239 return NULL;
240
241 to_find.ip = ip;
242 to_find.vid = vid;
243
244 index = batadv_hash_dat(&to_find, hash->size);
245 head = &hash->table[index];
246
247 rcu_read_lock();
248 hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
249 if (dat_entry->ip != ip)
250 continue;
251
252 if (!atomic_inc_not_zero(&dat_entry->refcount))
253 continue;
254
255 dat_entry_tmp = dat_entry;
256 break;
257 }
258 rcu_read_unlock();
259
260 return dat_entry_tmp;
261}
262
263
264
265
266
267
268
269
270static void batadv_dat_entry_add(struct batadv_priv *bat_priv, __be32 ip,
271 uint8_t *mac_addr, unsigned short vid)
272{
273 struct batadv_dat_entry *dat_entry;
274 int hash_added;
275
276 dat_entry = batadv_dat_entry_hash_find(bat_priv, ip, vid);
277
278 if (dat_entry) {
279 if (!batadv_compare_eth(dat_entry->mac_addr, mac_addr))
280 ether_addr_copy(dat_entry->mac_addr, mac_addr);
281 dat_entry->last_update = jiffies;
282 batadv_dbg(BATADV_DBG_DAT, bat_priv,
283 "Entry updated: %pI4 %pM (vid: %d)\n",
284 &dat_entry->ip, dat_entry->mac_addr,
285 BATADV_PRINT_VID(vid));
286 goto out;
287 }
288
289 dat_entry = kmalloc(sizeof(*dat_entry), GFP_ATOMIC);
290 if (!dat_entry)
291 goto out;
292
293 dat_entry->ip = ip;
294 dat_entry->vid = vid;
295 ether_addr_copy(dat_entry->mac_addr, mac_addr);
296 dat_entry->last_update = jiffies;
297 atomic_set(&dat_entry->refcount, 2);
298
299 hash_added = batadv_hash_add(bat_priv->dat.hash, batadv_compare_dat,
300 batadv_hash_dat, dat_entry,
301 &dat_entry->hash_entry);
302
303 if (unlikely(hash_added != 0)) {
304
305 batadv_dat_entry_free_ref(dat_entry);
306 goto out;
307 }
308
309 batadv_dbg(BATADV_DBG_DAT, bat_priv, "New entry added: %pI4 %pM (vid: %d)\n",
310 &dat_entry->ip, dat_entry->mac_addr, BATADV_PRINT_VID(vid));
311
312out:
313 if (dat_entry)
314 batadv_dat_entry_free_ref(dat_entry);
315}
316
317#ifdef CONFIG_BATMAN_ADV_DEBUG
318
319
320
321
322
323
324
325
326
327static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
328 uint16_t type, int hdr_size, char *msg)
329{
330 struct batadv_unicast_4addr_packet *unicast_4addr_packet;
331 struct batadv_bcast_packet *bcast_pkt;
332 uint8_t *orig_addr;
333 __be32 ip_src, ip_dst;
334
335 if (msg)
336 batadv_dbg(BATADV_DBG_DAT, bat_priv, "%s\n", msg);
337
338 ip_src = batadv_arp_ip_src(skb, hdr_size);
339 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
340 batadv_dbg(BATADV_DBG_DAT, bat_priv,
341 "ARP MSG = [src: %pM-%pI4 dst: %pM-%pI4]\n",
342 batadv_arp_hw_src(skb, hdr_size), &ip_src,
343 batadv_arp_hw_dst(skb, hdr_size), &ip_dst);
344
345 if (hdr_size == 0)
346 return;
347
348 unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
349
350 switch (unicast_4addr_packet->u.packet_type) {
351 case BATADV_UNICAST:
352 batadv_dbg(BATADV_DBG_DAT, bat_priv,
353 "* encapsulated within a UNICAST packet\n");
354 break;
355 case BATADV_UNICAST_4ADDR:
356 batadv_dbg(BATADV_DBG_DAT, bat_priv,
357 "* encapsulated within a UNICAST_4ADDR packet (src: %pM)\n",
358 unicast_4addr_packet->src);
359 switch (unicast_4addr_packet->subtype) {
360 case BATADV_P_DAT_DHT_PUT:
361 batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_PUT\n");
362 break;
363 case BATADV_P_DAT_DHT_GET:
364 batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DAT_DHT_GET\n");
365 break;
366 case BATADV_P_DAT_CACHE_REPLY:
367 batadv_dbg(BATADV_DBG_DAT, bat_priv,
368 "* type: DAT_CACHE_REPLY\n");
369 break;
370 case BATADV_P_DATA:
371 batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: DATA\n");
372 break;
373 default:
374 batadv_dbg(BATADV_DBG_DAT, bat_priv, "* type: Unknown (%u)!\n",
375 unicast_4addr_packet->u.packet_type);
376 }
377 break;
378 case BATADV_BCAST:
379 bcast_pkt = (struct batadv_bcast_packet *)unicast_4addr_packet;
380 orig_addr = bcast_pkt->orig;
381 batadv_dbg(BATADV_DBG_DAT, bat_priv,
382 "* encapsulated within a BCAST packet (src: %pM)\n",
383 orig_addr);
384 break;
385 default:
386 batadv_dbg(BATADV_DBG_DAT, bat_priv,
387 "* encapsulated within an unknown packet type (0x%x)\n",
388 unicast_4addr_packet->u.packet_type);
389 }
390}
391
392#else
393
394static void batadv_dbg_arp(struct batadv_priv *bat_priv, struct sk_buff *skb,
395 uint16_t type, int hdr_size, char *msg)
396{
397}
398
399#endif
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414static bool batadv_is_orig_node_eligible(struct batadv_dat_candidate *res,
415 int select, batadv_dat_addr_t tmp_max,
416 batadv_dat_addr_t max,
417 batadv_dat_addr_t last_max,
418 struct batadv_orig_node *candidate,
419 struct batadv_orig_node *max_orig_node)
420{
421 bool ret = false;
422 int j;
423
424
425 if (!(candidate->capabilities & BATADV_ORIG_CAPA_HAS_DAT))
426 goto out;
427
428
429 for (j = 0; j < select; j++)
430 if (res[j].orig_node == candidate)
431 break;
432
433 if (j < select)
434 goto out;
435
436 if (tmp_max > last_max)
437 goto out;
438
439
440
441 if (tmp_max < max)
442 goto out;
443
444
445
446 if ((tmp_max == max) && max_orig_node &&
447 (batadv_compare_eth(candidate->orig, max_orig_node->orig) > 0))
448 goto out;
449
450 ret = true;
451out:
452 return ret;
453}
454
455
456
457
458
459
460
461
462
463static void batadv_choose_next_candidate(struct batadv_priv *bat_priv,
464 struct batadv_dat_candidate *cands,
465 int select, batadv_dat_addr_t ip_key,
466 batadv_dat_addr_t *last_max)
467{
468 batadv_dat_addr_t max = 0, tmp_max = 0;
469 struct batadv_orig_node *orig_node, *max_orig_node = NULL;
470 struct batadv_hashtable *hash = bat_priv->orig_hash;
471 struct hlist_head *head;
472 int i;
473
474
475
476
477 cands[select].type = BATADV_DAT_CANDIDATE_NOT_FOUND;
478
479
480
481
482 for (i = 0; i < hash->size; i++) {
483 head = &hash->table[i];
484
485 rcu_read_lock();
486 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
487
488 tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr +
489 ip_key;
490
491 if (!batadv_is_orig_node_eligible(cands, select,
492 tmp_max, max,
493 *last_max, orig_node,
494 max_orig_node))
495 continue;
496
497 if (!atomic_inc_not_zero(&orig_node->refcount))
498 continue;
499
500 max = tmp_max;
501 if (max_orig_node)
502 batadv_orig_node_free_ref(max_orig_node);
503 max_orig_node = orig_node;
504 }
505 rcu_read_unlock();
506 }
507 if (max_orig_node) {
508 cands[select].type = BATADV_DAT_CANDIDATE_ORIG;
509 cands[select].orig_node = max_orig_node;
510 batadv_dbg(BATADV_DBG_DAT, bat_priv,
511 "dat_select_candidates() %d: selected %pM addr=%u dist=%u\n",
512 select, max_orig_node->orig, max_orig_node->dat_addr,
513 max);
514 }
515 *last_max = max;
516}
517
518
519
520
521
522
523
524
525
526
527
528
529
530static struct batadv_dat_candidate *
531batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst)
532{
533 int select;
534 batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key;
535 struct batadv_dat_candidate *res;
536
537 if (!bat_priv->orig_hash)
538 return NULL;
539
540 res = kmalloc_array(BATADV_DAT_CANDIDATES_NUM, sizeof(*res),
541 GFP_ATOMIC);
542 if (!res)
543 return NULL;
544
545 ip_key = (batadv_dat_addr_t)batadv_hash_dat(&ip_dst,
546 BATADV_DAT_ADDR_MAX);
547
548 batadv_dbg(BATADV_DBG_DAT, bat_priv,
549 "dat_select_candidates(): IP=%pI4 hash(IP)=%u\n", &ip_dst,
550 ip_key);
551
552 for (select = 0; select < BATADV_DAT_CANDIDATES_NUM; select++)
553 batadv_choose_next_candidate(bat_priv, res, select, ip_key,
554 &last_max);
555
556 return res;
557}
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572static bool batadv_dat_send_data(struct batadv_priv *bat_priv,
573 struct sk_buff *skb, __be32 ip,
574 int packet_subtype)
575{
576 int i;
577 bool ret = false;
578 int send_status;
579 struct batadv_neigh_node *neigh_node = NULL;
580 struct sk_buff *tmp_skb;
581 struct batadv_dat_candidate *cand;
582
583 cand = batadv_dat_select_candidates(bat_priv, ip);
584 if (!cand)
585 goto out;
586
587 batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip);
588
589 for (i = 0; i < BATADV_DAT_CANDIDATES_NUM; i++) {
590 if (cand[i].type == BATADV_DAT_CANDIDATE_NOT_FOUND)
591 continue;
592
593 neigh_node = batadv_orig_router_get(cand[i].orig_node,
594 BATADV_IF_DEFAULT);
595 if (!neigh_node)
596 goto free_orig;
597
598 tmp_skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
599 if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb,
600 cand[i].orig_node,
601 packet_subtype)) {
602 kfree_skb(tmp_skb);
603 goto free_neigh;
604 }
605
606 send_status = batadv_send_skb_packet(tmp_skb,
607 neigh_node->if_incoming,
608 neigh_node->addr);
609 if (send_status == NET_XMIT_SUCCESS) {
610
611 switch (packet_subtype) {
612 case BATADV_P_DAT_DHT_GET:
613 batadv_inc_counter(bat_priv,
614 BATADV_CNT_DAT_GET_TX);
615 break;
616 case BATADV_P_DAT_DHT_PUT:
617 batadv_inc_counter(bat_priv,
618 BATADV_CNT_DAT_PUT_TX);
619 break;
620 }
621
622
623 ret = true;
624 }
625free_neigh:
626 batadv_neigh_node_free_ref(neigh_node);
627free_orig:
628 batadv_orig_node_free_ref(cand[i].orig_node);
629 }
630
631out:
632 kfree(cand);
633 return ret;
634}
635
636
637
638
639
640
641static void batadv_dat_tvlv_container_update(struct batadv_priv *bat_priv)
642{
643 char dat_mode;
644
645 dat_mode = atomic_read(&bat_priv->distributed_arp_table);
646
647 switch (dat_mode) {
648 case 0:
649 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1);
650 break;
651 case 1:
652 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_DAT, 1,
653 NULL, 0);
654 break;
655 }
656}
657
658
659
660
661
662
663void batadv_dat_status_update(struct net_device *net_dev)
664{
665 struct batadv_priv *bat_priv = netdev_priv(net_dev);
666
667 batadv_dat_tvlv_container_update(bat_priv);
668}
669
670
671
672
673
674
675
676
677
678static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
679 struct batadv_orig_node *orig,
680 uint8_t flags,
681 void *tvlv_value,
682 uint16_t tvlv_value_len)
683{
684 if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND)
685 orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_DAT;
686 else
687 orig->capabilities |= BATADV_ORIG_CAPA_HAS_DAT;
688}
689
690
691
692
693
694static void batadv_dat_hash_free(struct batadv_priv *bat_priv)
695{
696 if (!bat_priv->dat.hash)
697 return;
698
699 __batadv_dat_purge(bat_priv, NULL);
700
701 batadv_hash_destroy(bat_priv->dat.hash);
702
703 bat_priv->dat.hash = NULL;
704}
705
706
707
708
709
710int batadv_dat_init(struct batadv_priv *bat_priv)
711{
712 if (bat_priv->dat.hash)
713 return 0;
714
715 bat_priv->dat.hash = batadv_hash_new(1024);
716
717 if (!bat_priv->dat.hash)
718 return -ENOMEM;
719
720 batadv_dat_start_timer(bat_priv);
721
722 batadv_tvlv_handler_register(bat_priv, batadv_dat_tvlv_ogm_handler_v1,
723 NULL, BATADV_TVLV_DAT, 1,
724 BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
725 batadv_dat_tvlv_container_update(bat_priv);
726 return 0;
727}
728
729
730
731
732
733void batadv_dat_free(struct batadv_priv *bat_priv)
734{
735 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_DAT, 1);
736 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_DAT, 1);
737
738 cancel_delayed_work_sync(&bat_priv->dat.work);
739
740 batadv_dat_hash_free(bat_priv);
741}
742
743
744
745
746
747
748int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset)
749{
750 struct net_device *net_dev = (struct net_device *)seq->private;
751 struct batadv_priv *bat_priv = netdev_priv(net_dev);
752 struct batadv_hashtable *hash = bat_priv->dat.hash;
753 struct batadv_dat_entry *dat_entry;
754 struct batadv_hard_iface *primary_if;
755 struct hlist_head *head;
756 unsigned long last_seen_jiffies;
757 int last_seen_msecs, last_seen_secs, last_seen_mins;
758 uint32_t i;
759
760 primary_if = batadv_seq_print_text_primary_if_get(seq);
761 if (!primary_if)
762 goto out;
763
764 seq_printf(seq, "Distributed ARP Table (%s):\n", net_dev->name);
765 seq_printf(seq, " %-7s %-9s %4s %11s\n", "IPv4",
766 "MAC", "VID", "last-seen");
767
768 for (i = 0; i < hash->size; i++) {
769 head = &hash->table[i];
770
771 rcu_read_lock();
772 hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
773 last_seen_jiffies = jiffies - dat_entry->last_update;
774 last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
775 last_seen_mins = last_seen_msecs / 60000;
776 last_seen_msecs = last_seen_msecs % 60000;
777 last_seen_secs = last_seen_msecs / 1000;
778
779 seq_printf(seq, " * %15pI4 %14pM %4i %6i:%02i\n",
780 &dat_entry->ip, dat_entry->mac_addr,
781 BATADV_PRINT_VID(dat_entry->vid),
782 last_seen_mins, last_seen_secs);
783 }
784 rcu_read_unlock();
785 }
786
787out:
788 if (primary_if)
789 batadv_hardif_free_ref(primary_if);
790 return 0;
791}
792
793
794
795
796
797
798
799
800
801static uint16_t batadv_arp_get_type(struct batadv_priv *bat_priv,
802 struct sk_buff *skb, int hdr_size)
803{
804 struct arphdr *arphdr;
805 struct ethhdr *ethhdr;
806 __be32 ip_src, ip_dst;
807 uint8_t *hw_src, *hw_dst;
808 uint16_t type = 0;
809
810
811 if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN)))
812 goto out;
813
814 ethhdr = (struct ethhdr *)(skb->data + hdr_size);
815
816 if (ethhdr->h_proto != htons(ETH_P_ARP))
817 goto out;
818
819
820 if (unlikely(!pskb_may_pull(skb, hdr_size + ETH_HLEN +
821 arp_hdr_len(skb->dev))))
822 goto out;
823
824 arphdr = (struct arphdr *)(skb->data + hdr_size + ETH_HLEN);
825
826
827 if (arphdr->ar_hrd != htons(ARPHRD_ETHER))
828 goto out;
829
830 if (arphdr->ar_pro != htons(ETH_P_IP))
831 goto out;
832
833 if (arphdr->ar_hln != ETH_ALEN)
834 goto out;
835
836 if (arphdr->ar_pln != 4)
837 goto out;
838
839
840
841
842 ip_src = batadv_arp_ip_src(skb, hdr_size);
843 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
844 if (ipv4_is_loopback(ip_src) || ipv4_is_multicast(ip_src) ||
845 ipv4_is_loopback(ip_dst) || ipv4_is_multicast(ip_dst) ||
846 ipv4_is_zeronet(ip_src) || ipv4_is_lbcast(ip_src) ||
847 ipv4_is_zeronet(ip_dst) || ipv4_is_lbcast(ip_dst))
848 goto out;
849
850 hw_src = batadv_arp_hw_src(skb, hdr_size);
851 if (is_zero_ether_addr(hw_src) || is_multicast_ether_addr(hw_src))
852 goto out;
853
854
855 if (arphdr->ar_op != htons(ARPOP_REQUEST)) {
856 hw_dst = batadv_arp_hw_dst(skb, hdr_size);
857 if (is_zero_ether_addr(hw_dst) ||
858 is_multicast_ether_addr(hw_dst))
859 goto out;
860 }
861
862 type = ntohs(arphdr->ar_op);
863out:
864 return type;
865}
866
867
868
869
870
871
872
873
874
875static unsigned short batadv_dat_get_vid(struct sk_buff *skb, int *hdr_size)
876{
877 unsigned short vid;
878
879 vid = batadv_get_vid(skb, *hdr_size);
880
881
882
883
884
885
886 if (vid & BATADV_VLAN_HAS_TAG)
887 *hdr_size += VLAN_HLEN;
888
889 return vid;
890}
891
892
893
894
895
896
897
898
899
900
901
902bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
903 struct sk_buff *skb)
904{
905 uint16_t type = 0;
906 __be32 ip_dst, ip_src;
907 uint8_t *hw_src;
908 bool ret = false;
909 struct batadv_dat_entry *dat_entry = NULL;
910 struct sk_buff *skb_new;
911 int hdr_size = 0;
912 unsigned short vid;
913
914 if (!atomic_read(&bat_priv->distributed_arp_table))
915 goto out;
916
917 vid = batadv_dat_get_vid(skb, &hdr_size);
918
919 type = batadv_arp_get_type(bat_priv, skb, hdr_size);
920
921
922
923 if (type != ARPOP_REQUEST)
924 goto out;
925
926 batadv_dbg_arp(bat_priv, skb, type, hdr_size,
927 "Parsing outgoing ARP REQUEST");
928
929 ip_src = batadv_arp_ip_src(skb, hdr_size);
930 hw_src = batadv_arp_hw_src(skb, hdr_size);
931 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
932
933 batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid);
934
935 dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid);
936 if (dat_entry) {
937
938
939
940
941
942
943
944
945 if (batadv_is_my_client(bat_priv, dat_entry->mac_addr, vid)) {
946 ret = true;
947 goto out;
948 }
949
950 skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
951 bat_priv->soft_iface, ip_dst, hw_src,
952 dat_entry->mac_addr, hw_src);
953 if (!skb_new)
954 goto out;
955
956 if (vid & BATADV_VLAN_HAS_TAG)
957 skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q),
958 vid & VLAN_VID_MASK);
959
960 skb_reset_mac_header(skb_new);
961 skb_new->protocol = eth_type_trans(skb_new,
962 bat_priv->soft_iface);
963 bat_priv->stats.rx_packets++;
964 bat_priv->stats.rx_bytes += skb->len + ETH_HLEN + hdr_size;
965 bat_priv->soft_iface->last_rx = jiffies;
966
967 netif_rx(skb_new);
968 batadv_dbg(BATADV_DBG_DAT, bat_priv, "ARP request replied locally\n");
969 ret = true;
970 } else {
971
972 ret = batadv_dat_send_data(bat_priv, skb, ip_dst,
973 BATADV_P_DAT_DHT_GET);
974 }
975out:
976 if (dat_entry)
977 batadv_dat_entry_free_ref(dat_entry);
978 return ret;
979}
980
981
982
983
984
985
986
987
988
989
990bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
991 struct sk_buff *skb, int hdr_size)
992{
993 uint16_t type;
994 __be32 ip_src, ip_dst;
995 uint8_t *hw_src;
996 struct sk_buff *skb_new;
997 struct batadv_dat_entry *dat_entry = NULL;
998 bool ret = false;
999 unsigned short vid;
1000 int err;
1001
1002 if (!atomic_read(&bat_priv->distributed_arp_table))
1003 goto out;
1004
1005 vid = batadv_dat_get_vid(skb, &hdr_size);
1006
1007 type = batadv_arp_get_type(bat_priv, skb, hdr_size);
1008 if (type != ARPOP_REQUEST)
1009 goto out;
1010
1011 hw_src = batadv_arp_hw_src(skb, hdr_size);
1012 ip_src = batadv_arp_ip_src(skb, hdr_size);
1013 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
1014
1015 batadv_dbg_arp(bat_priv, skb, type, hdr_size,
1016 "Parsing incoming ARP REQUEST");
1017
1018 batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid);
1019
1020 dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid);
1021 if (!dat_entry)
1022 goto out;
1023
1024 skb_new = arp_create(ARPOP_REPLY, ETH_P_ARP, ip_src,
1025 bat_priv->soft_iface, ip_dst, hw_src,
1026 dat_entry->mac_addr, hw_src);
1027
1028 if (!skb_new)
1029 goto out;
1030
1031
1032
1033
1034 skb_reset_mac_header(skb_new);
1035
1036 if (vid & BATADV_VLAN_HAS_TAG)
1037 skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q),
1038 vid & VLAN_VID_MASK);
1039
1040
1041
1042
1043
1044 if (hdr_size == sizeof(struct batadv_unicast_4addr_packet))
1045 err = batadv_send_skb_via_tt_4addr(bat_priv, skb_new,
1046 BATADV_P_DAT_CACHE_REPLY,
1047 NULL, vid);
1048 else
1049 err = batadv_send_skb_via_tt(bat_priv, skb_new, NULL, vid);
1050
1051 if (err != NET_XMIT_DROP) {
1052 batadv_inc_counter(bat_priv, BATADV_CNT_DAT_CACHED_REPLY_TX);
1053 ret = true;
1054 }
1055out:
1056 if (dat_entry)
1057 batadv_dat_entry_free_ref(dat_entry);
1058 if (ret)
1059 kfree_skb(skb);
1060 return ret;
1061}
1062
1063
1064
1065
1066
1067
1068void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
1069 struct sk_buff *skb)
1070{
1071 uint16_t type;
1072 __be32 ip_src, ip_dst;
1073 uint8_t *hw_src, *hw_dst;
1074 int hdr_size = 0;
1075 unsigned short vid;
1076
1077 if (!atomic_read(&bat_priv->distributed_arp_table))
1078 return;
1079
1080 vid = batadv_dat_get_vid(skb, &hdr_size);
1081
1082 type = batadv_arp_get_type(bat_priv, skb, hdr_size);
1083 if (type != ARPOP_REPLY)
1084 return;
1085
1086 batadv_dbg_arp(bat_priv, skb, type, hdr_size,
1087 "Parsing outgoing ARP REPLY");
1088
1089 hw_src = batadv_arp_hw_src(skb, hdr_size);
1090 ip_src = batadv_arp_ip_src(skb, hdr_size);
1091 hw_dst = batadv_arp_hw_dst(skb, hdr_size);
1092 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
1093
1094 batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid);
1095 batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid);
1096
1097
1098
1099
1100 batadv_dat_send_data(bat_priv, skb, ip_src, BATADV_P_DAT_DHT_PUT);
1101 batadv_dat_send_data(bat_priv, skb, ip_dst, BATADV_P_DAT_DHT_PUT);
1102}
1103
1104
1105
1106
1107
1108
1109
1110
1111bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
1112 struct sk_buff *skb, int hdr_size)
1113{
1114 uint16_t type;
1115 __be32 ip_src, ip_dst;
1116 uint8_t *hw_src, *hw_dst;
1117 bool ret = false;
1118 unsigned short vid;
1119
1120 if (!atomic_read(&bat_priv->distributed_arp_table))
1121 goto out;
1122
1123 vid = batadv_dat_get_vid(skb, &hdr_size);
1124
1125 type = batadv_arp_get_type(bat_priv, skb, hdr_size);
1126 if (type != ARPOP_REPLY)
1127 goto out;
1128
1129 batadv_dbg_arp(bat_priv, skb, type, hdr_size,
1130 "Parsing incoming ARP REPLY");
1131
1132 hw_src = batadv_arp_hw_src(skb, hdr_size);
1133 ip_src = batadv_arp_ip_src(skb, hdr_size);
1134 hw_dst = batadv_arp_hw_dst(skb, hdr_size);
1135 ip_dst = batadv_arp_ip_dst(skb, hdr_size);
1136
1137
1138
1139
1140 batadv_dat_entry_add(bat_priv, ip_src, hw_src, vid);
1141 batadv_dat_entry_add(bat_priv, ip_dst, hw_dst, vid);
1142
1143
1144
1145
1146 ret = !batadv_is_my_client(bat_priv, hw_dst, vid);
1147out:
1148 if (ret)
1149 kfree_skb(skb);
1150
1151 return ret;
1152}
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
1163 struct batadv_forw_packet *forw_packet)
1164{
1165 uint16_t type;
1166 __be32 ip_dst;
1167 struct batadv_dat_entry *dat_entry = NULL;
1168 bool ret = false;
1169 int hdr_size = sizeof(struct batadv_bcast_packet);
1170 unsigned short vid;
1171
1172 if (!atomic_read(&bat_priv->distributed_arp_table))
1173 goto out;
1174
1175
1176
1177
1178 if (forw_packet->num_packets)
1179 goto out;
1180
1181 vid = batadv_dat_get_vid(forw_packet->skb, &hdr_size);
1182
1183 type = batadv_arp_get_type(bat_priv, forw_packet->skb, hdr_size);
1184 if (type != ARPOP_REQUEST)
1185 goto out;
1186
1187 ip_dst = batadv_arp_ip_dst(forw_packet->skb, hdr_size);
1188 dat_entry = batadv_dat_entry_hash_find(bat_priv, ip_dst, vid);
1189
1190 if (!dat_entry) {
1191 batadv_dbg(BATADV_DBG_DAT, bat_priv,
1192 "ARP Request for %pI4: fallback\n", &ip_dst);
1193 goto out;
1194 }
1195
1196 batadv_dbg(BATADV_DBG_DAT, bat_priv,
1197 "ARP Request for %pI4: fallback prevented\n", &ip_dst);
1198 ret = true;
1199
1200out:
1201 if (dat_entry)
1202 batadv_dat_entry_free_ref(dat_entry);
1203 return ret;
1204}
1205