aboutsummaryrefslogtreecommitdiffstats
path: root/net/batman-adv/vis.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/batman-adv/vis.c')
-rw-r--r--net/batman-adv/vis.c938
1 files changed, 0 insertions, 938 deletions
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
deleted file mode 100644
index d8ea31a58457..000000000000
--- a/net/batman-adv/vis.c
+++ /dev/null
@@ -1,938 +0,0 @@
1/* Copyright (C) 2008-2013 B.A.T.M.A.N. contributors:
2 *
3 * Simon Wunderlich
4 *
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.
8 *
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.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
18 */
19
20#include "main.h"
21#include "send.h"
22#include "translation-table.h"
23#include "vis.h"
24#include "soft-interface.h"
25#include "hard-interface.h"
26#include "hash.h"
27#include "originator.h"
28
29#define BATADV_MAX_VIS_PACKET_SIZE 1000
30
31/* hash class keys */
32static struct lock_class_key batadv_vis_hash_lock_class_key;
33
34/* free the info */
35static void batadv_free_info(struct kref *ref)
36{
37 struct batadv_vis_info *info;
38 struct batadv_priv *bat_priv;
39 struct batadv_vis_recvlist_node *entry, *tmp;
40
41 info = container_of(ref, struct batadv_vis_info, refcount);
42 bat_priv = info->bat_priv;
43
44 list_del_init(&info->send_list);
45 spin_lock_bh(&bat_priv->vis.list_lock);
46 list_for_each_entry_safe(entry, tmp, &info->recv_list, list) {
47 list_del(&entry->list);
48 kfree(entry);
49 }
50
51 spin_unlock_bh(&bat_priv->vis.list_lock);
52 kfree_skb(info->skb_packet);
53 kfree(info);
54}
55
56/* Compare two vis packets, used by the hashing algorithm */
57static int batadv_vis_info_cmp(const struct hlist_node *node, const void *data2)
58{
59 const struct batadv_vis_info *d1, *d2;
60 const struct batadv_vis_packet *p1, *p2;
61
62 d1 = container_of(node, struct batadv_vis_info, hash_entry);
63 d2 = data2;
64 p1 = (struct batadv_vis_packet *)d1->skb_packet->data;
65 p2 = (struct batadv_vis_packet *)d2->skb_packet->data;
66 return batadv_compare_eth(p1->vis_orig, p2->vis_orig);
67}
68
69/* hash function to choose an entry in a hash table of given size
70 * hash algorithm from http://en.wikipedia.org/wiki/Hash_table
71 */
72static uint32_t batadv_vis_info_choose(const void *data, uint32_t size)
73{
74 const struct batadv_vis_info *vis_info = data;
75 const struct batadv_vis_packet *packet;
76 const unsigned char *key;
77 uint32_t hash = 0;
78 size_t i;
79
80 packet = (struct batadv_vis_packet *)vis_info->skb_packet->data;
81 key = packet->vis_orig;
82 for (i = 0; i < ETH_ALEN; i++) {
83 hash += key[i];
84 hash += (hash << 10);
85 hash ^= (hash >> 6);
86 }
87
88 hash += (hash << 3);
89 hash ^= (hash >> 11);
90 hash += (hash << 15);
91
92 return hash % size;
93}
94
95static struct batadv_vis_info *
96batadv_vis_hash_find(struct batadv_priv *bat_priv, const void *data)
97{
98 struct batadv_hashtable *hash = bat_priv->vis.hash;
99 struct hlist_head *head;
100 struct batadv_vis_info *vis_info, *vis_info_tmp = NULL;
101 uint32_t index;
102
103 if (!hash)
104 return NULL;
105
106 index = batadv_vis_info_choose(data, hash->size);
107 head = &hash->table[index];
108
109 rcu_read_lock();
110 hlist_for_each_entry_rcu(vis_info, head, hash_entry) {
111 if (!batadv_vis_info_cmp(&vis_info->hash_entry, data))
112 continue;
113
114 vis_info_tmp = vis_info;
115 break;
116 }
117 rcu_read_unlock();
118
119 return vis_info_tmp;
120}
121
122/* insert interface to the list of interfaces of one originator, if it
123 * does not already exist in the list
124 */
125static void batadv_vis_data_insert_interface(const uint8_t *interface,
126 struct hlist_head *if_list,
127 bool primary)
128{
129 struct batadv_vis_if_list_entry *entry;
130
131 hlist_for_each_entry(entry, if_list, list) {
132 if (batadv_compare_eth(entry->addr, interface))
133 return;
134 }
135
136 /* it's a new address, add it to the list */
137 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
138 if (!entry)
139 return;
140 memcpy(entry->addr, interface, ETH_ALEN);
141 entry->primary = primary;
142 hlist_add_head(&entry->list, if_list);
143}
144
145static void batadv_vis_data_read_prim_sec(struct seq_file *seq,
146 const struct hlist_head *if_list)
147{
148 struct batadv_vis_if_list_entry *entry;
149
150 hlist_for_each_entry(entry, if_list, list) {
151 if (entry->primary)
152 seq_puts(seq, "PRIMARY, ");
153 else
154 seq_printf(seq, "SEC %pM, ", entry->addr);
155 }
156}
157
158/* read an entry */
159static ssize_t
160batadv_vis_data_read_entry(struct seq_file *seq,
161 const struct batadv_vis_info_entry *entry,
162 const uint8_t *src, bool primary)
163{
164 if (primary && entry->quality == 0)
165 return seq_printf(seq, "TT %pM, ", entry->dest);
166 else if (batadv_compare_eth(entry->src, src))
167 return seq_printf(seq, "TQ %pM %d, ", entry->dest,
168 entry->quality);
169
170 return 0;
171}
172
173static void
174batadv_vis_data_insert_interfaces(struct hlist_head *list,
175 struct batadv_vis_packet *packet,
176 struct batadv_vis_info_entry *entries)
177{
178 int i;
179
180 for (i = 0; i < packet->entries; i++) {
181 if (entries[i].quality == 0)
182 continue;
183
184 if (batadv_compare_eth(entries[i].src, packet->vis_orig))
185 continue;
186
187 batadv_vis_data_insert_interface(entries[i].src, list, false);
188 }
189}
190
191static void batadv_vis_data_read_entries(struct seq_file *seq,
192 struct hlist_head *list,
193 struct batadv_vis_packet *packet,
194 struct batadv_vis_info_entry *entries)
195{
196 int i;
197 struct batadv_vis_if_list_entry *entry;
198
199 hlist_for_each_entry(entry, list, list) {
200 seq_printf(seq, "%pM,", entry->addr);
201
202 for (i = 0; i < packet->entries; i++)
203 batadv_vis_data_read_entry(seq, &entries[i],
204 entry->addr, entry->primary);
205
206 /* add primary/secondary records */
207 if (batadv_compare_eth(entry->addr, packet->vis_orig))
208 batadv_vis_data_read_prim_sec(seq, list);
209
210 seq_puts(seq, "\n");
211 }
212}
213
214static void batadv_vis_seq_print_text_bucket(struct seq_file *seq,
215 const struct hlist_head *head)
216{
217 struct batadv_vis_info *info;
218 struct batadv_vis_packet *packet;
219 uint8_t *entries_pos;
220 struct batadv_vis_info_entry *entries;
221 struct batadv_vis_if_list_entry *entry;
222 struct hlist_node *n;
223
224 HLIST_HEAD(vis_if_list);
225
226 hlist_for_each_entry_rcu(info, head, hash_entry) {
227 packet = (struct batadv_vis_packet *)info->skb_packet->data;
228 entries_pos = (uint8_t *)packet + sizeof(*packet);
229 entries = (struct batadv_vis_info_entry *)entries_pos;
230
231 batadv_vis_data_insert_interface(packet->vis_orig, &vis_if_list,
232 true);
233 batadv_vis_data_insert_interfaces(&vis_if_list, packet,
234 entries);
235 batadv_vis_data_read_entries(seq, &vis_if_list, packet,
236 entries);
237
238 hlist_for_each_entry_safe(entry, n, &vis_if_list, list) {
239 hlist_del(&entry->list);
240 kfree(entry);
241 }
242 }
243}
244
245int batadv_vis_seq_print_text(struct seq_file *seq, void *offset)
246{
247 struct batadv_hard_iface *primary_if;
248 struct hlist_head *head;
249 struct net_device *net_dev = (struct net_device *)seq->private;
250 struct batadv_priv *bat_priv = netdev_priv(net_dev);
251 struct batadv_hashtable *hash = bat_priv->vis.hash;
252 uint32_t i;
253 int ret = 0;
254 int vis_server = atomic_read(&bat_priv->vis_mode);
255
256 primary_if = batadv_primary_if_get_selected(bat_priv);
257 if (!primary_if)
258 goto out;
259
260 if (vis_server == BATADV_VIS_TYPE_CLIENT_UPDATE)
261 goto out;
262
263 spin_lock_bh(&bat_priv->vis.hash_lock);
264 for (i = 0; i < hash->size; i++) {
265 head = &hash->table[i];
266 batadv_vis_seq_print_text_bucket(seq, head);
267 }
268 spin_unlock_bh(&bat_priv->vis.hash_lock);
269
270out:
271 if (primary_if)
272 batadv_hardif_free_ref(primary_if);
273 return ret;
274}
275
276/* add the info packet to the send list, if it was not
277 * already linked in.
278 */
279static void batadv_send_list_add(struct batadv_priv *bat_priv,
280 struct batadv_vis_info *info)
281{
282 if (list_empty(&info->send_list)) {
283 kref_get(&info->refcount);
284 list_add_tail(&info->send_list, &bat_priv->vis.send_list);
285 }
286}
287
288/* delete the info packet from the send list, if it was
289 * linked in.
290 */
291static void batadv_send_list_del(struct batadv_vis_info *info)
292{
293 if (!list_empty(&info->send_list)) {
294 list_del_init(&info->send_list);
295 kref_put(&info->refcount, batadv_free_info);
296 }
297}
298
299/* tries to add one entry to the receive list. */
300static void batadv_recv_list_add(struct batadv_priv *bat_priv,
301 struct list_head *recv_list, const char *mac)
302{
303 struct batadv_vis_recvlist_node *entry;
304
305 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
306 if (!entry)
307 return;
308
309 memcpy(entry->mac, mac, ETH_ALEN);
310 spin_lock_bh(&bat_priv->vis.list_lock);
311 list_add_tail(&entry->list, recv_list);
312 spin_unlock_bh(&bat_priv->vis.list_lock);
313}
314
315/* returns 1 if this mac is in the recv_list */
316static int batadv_recv_list_is_in(struct batadv_priv *bat_priv,
317 const struct list_head *recv_list,
318 const char *mac)
319{
320 const struct batadv_vis_recvlist_node *entry;
321
322 spin_lock_bh(&bat_priv->vis.list_lock);
323 list_for_each_entry(entry, recv_list, list) {
324 if (batadv_compare_eth(entry->mac, mac)) {
325 spin_unlock_bh(&bat_priv->vis.list_lock);
326 return 1;
327 }
328 }
329 spin_unlock_bh(&bat_priv->vis.list_lock);
330 return 0;
331}
332
333/* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old,
334 * broken.. ). vis hash must be locked outside. is_new is set when the packet
335 * is newer than old entries in the hash.
336 */
337static struct batadv_vis_info *
338batadv_add_packet(struct batadv_priv *bat_priv,
339 struct batadv_vis_packet *vis_packet, int vis_info_len,
340 int *is_new, int make_broadcast)
341{
342 struct batadv_vis_info *info, *old_info;
343 struct batadv_vis_packet *search_packet, *old_packet;
344 struct batadv_vis_info search_elem;
345 struct batadv_vis_packet *packet;
346 struct sk_buff *tmp_skb;
347 int hash_added;
348 size_t len;
349 size_t max_entries;
350
351 *is_new = 0;
352 /* sanity check */
353 if (!bat_priv->vis.hash)
354 return NULL;
355
356 /* see if the packet is already in vis_hash */
357 search_elem.skb_packet = dev_alloc_skb(sizeof(*search_packet));
358 if (!search_elem.skb_packet)
359 return NULL;
360 len = sizeof(*search_packet);
361 tmp_skb = search_elem.skb_packet;
362 search_packet = (struct batadv_vis_packet *)skb_put(tmp_skb, len);
363
364 memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN);
365 old_info = batadv_vis_hash_find(bat_priv, &search_elem);
366 kfree_skb(search_elem.skb_packet);
367
368 if (old_info) {
369 tmp_skb = old_info->skb_packet;
370 old_packet = (struct batadv_vis_packet *)tmp_skb->data;
371 if (!batadv_seq_after(ntohl(vis_packet->seqno),
372 ntohl(old_packet->seqno))) {
373 if (old_packet->seqno == vis_packet->seqno) {
374 batadv_recv_list_add(bat_priv,
375 &old_info->recv_list,
376 vis_packet->sender_orig);
377 return old_info;
378 } else {
379 /* newer packet is already in hash. */
380 return NULL;
381 }
382 }
383 /* remove old entry */
384 batadv_hash_remove(bat_priv->vis.hash, batadv_vis_info_cmp,
385 batadv_vis_info_choose, old_info);
386 batadv_send_list_del(old_info);
387 kref_put(&old_info->refcount, batadv_free_info);
388 }
389
390 info = kmalloc(sizeof(*info), GFP_ATOMIC);
391 if (!info)
392 return NULL;
393
394 len = sizeof(*packet) + vis_info_len;
395 info->skb_packet = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN);
396 if (!info->skb_packet) {
397 kfree(info);
398 return NULL;
399 }
400 info->skb_packet->priority = TC_PRIO_CONTROL;
401 skb_reserve(info->skb_packet, ETH_HLEN);
402 packet = (struct batadv_vis_packet *)skb_put(info->skb_packet, len);
403
404 kref_init(&info->refcount);
405 INIT_LIST_HEAD(&info->send_list);
406 INIT_LIST_HEAD(&info->recv_list);
407 info->first_seen = jiffies;
408 info->bat_priv = bat_priv;
409 memcpy(packet, vis_packet, len);
410
411 /* initialize and add new packet. */
412 *is_new = 1;
413
414 /* Make it a broadcast packet, if required */
415 if (make_broadcast)
416 memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
417
418 /* repair if entries is longer than packet. */
419 max_entries = vis_info_len / sizeof(struct batadv_vis_info_entry);
420 if (packet->entries > max_entries)
421 packet->entries = max_entries;
422
423 batadv_recv_list_add(bat_priv, &info->recv_list, packet->sender_orig);
424
425 /* try to add it */
426 hash_added = batadv_hash_add(bat_priv->vis.hash, batadv_vis_info_cmp,
427 batadv_vis_info_choose, info,
428 &info->hash_entry);
429 if (hash_added != 0) {
430 /* did not work (for some reason) */
431 kref_put(&info->refcount, batadv_free_info);
432 info = NULL;
433 }
434
435 return info;
436}
437
438/* handle the server sync packet, forward if needed. */
439void batadv_receive_server_sync_packet(struct batadv_priv *bat_priv,
440 struct batadv_vis_packet *vis_packet,
441 int vis_info_len)
442{
443 struct batadv_vis_info *info;
444 int is_new, make_broadcast;
445 int vis_server = atomic_read(&bat_priv->vis_mode);
446
447 make_broadcast = (vis_server == BATADV_VIS_TYPE_SERVER_SYNC);
448
449 spin_lock_bh(&bat_priv->vis.hash_lock);
450 info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
451 &is_new, make_broadcast);
452 if (!info)
453 goto end;
454
455 /* only if we are server ourselves and packet is newer than the one in
456 * hash.
457 */
458 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC && is_new)
459 batadv_send_list_add(bat_priv, info);
460end:
461 spin_unlock_bh(&bat_priv->vis.hash_lock);
462}
463
464/* handle an incoming client update packet and schedule forward if needed. */
465void batadv_receive_client_update_packet(struct batadv_priv *bat_priv,
466 struct batadv_vis_packet *vis_packet,
467 int vis_info_len)
468{
469 struct batadv_vis_info *info;
470 struct batadv_vis_packet *packet;
471 int is_new;
472 int vis_server = atomic_read(&bat_priv->vis_mode);
473 int are_target = 0;
474
475 /* clients shall not broadcast. */
476 if (is_broadcast_ether_addr(vis_packet->target_orig))
477 return;
478
479 /* Are we the target for this VIS packet? */
480 if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC &&
481 batadv_is_my_mac(bat_priv, vis_packet->target_orig))
482 are_target = 1;
483
484 spin_lock_bh(&bat_priv->vis.hash_lock);
485 info = batadv_add_packet(bat_priv, vis_packet, vis_info_len,
486 &is_new, are_target);
487
488 if (!info)
489 goto end;
490 /* note that outdated packets will be dropped at this point. */
491
492 packet = (struct batadv_vis_packet *)info->skb_packet->data;
493
494 /* send only if we're the target server or ... */
495 if (are_target && is_new) {
496 packet->vis_type = BATADV_VIS_TYPE_SERVER_SYNC; /* upgrade! */
497 batadv_send_list_add(bat_priv, info);
498
499 /* ... we're not the recipient (and thus need to forward). */
500 } else if (!batadv_is_my_mac(bat_priv, packet->target_orig)) {
501 batadv_send_list_add(bat_priv, info);
502 }
503
504end:
505 spin_unlock_bh(&bat_priv->vis.hash_lock);
506}
507
508/* Walk the originators and find the VIS server with the best tq. Set the packet
509 * address to its address and return the best_tq.
510 *
511 * Must be called with the originator hash locked
512 */
513static int batadv_find_best_vis_server(struct batadv_priv *bat_priv,
514 struct batadv_vis_info *info)
515{
516 struct batadv_hashtable *hash = bat_priv->orig_hash;
517 struct batadv_neigh_node *router;
518 struct hlist_head *head;
519 struct batadv_orig_node *orig_node;
520 struct batadv_vis_packet *packet;
521 int best_tq = -1;
522 uint32_t i;
523
524 packet = (struct batadv_vis_packet *)info->skb_packet->data;
525
526 for (i = 0; i < hash->size; i++) {
527 head = &hash->table[i];
528
529 rcu_read_lock();
530 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
531 router = batadv_orig_node_get_router(orig_node);
532 if (!router)
533 continue;
534
535 if ((orig_node->flags & BATADV_VIS_SERVER) &&
536 (router->tq_avg > best_tq)) {
537 best_tq = router->tq_avg;
538 memcpy(packet->target_orig, orig_node->orig,
539 ETH_ALEN);
540 }
541 batadv_neigh_node_free_ref(router);
542 }
543 rcu_read_unlock();
544 }
545
546 return best_tq;
547}
548
549/* Return true if the vis packet is full. */
550static bool batadv_vis_packet_full(const struct batadv_vis_info *info)
551{
552 const struct batadv_vis_packet *packet;
553 size_t num;
554
555 packet = (struct batadv_vis_packet *)info->skb_packet->data;
556 num = BATADV_MAX_VIS_PACKET_SIZE / sizeof(struct batadv_vis_info_entry);
557
558 if (num < packet->entries + 1)
559 return true;
560 return false;
561}
562
563/* generates a packet of own vis data,
564 * returns 0 on success, -1 if no packet could be generated
565 */
566static int batadv_generate_vis_packet(struct batadv_priv *bat_priv)
567{
568 struct batadv_hashtable *hash = bat_priv->orig_hash;
569 struct hlist_head *head;
570 struct batadv_orig_node *orig_node;
571 struct batadv_neigh_node *router;
572 struct batadv_vis_info *info = bat_priv->vis.my_info;
573 struct batadv_vis_packet *packet;
574 struct batadv_vis_info_entry *entry;
575 struct batadv_tt_common_entry *tt_common_entry;
576 uint8_t *packet_pos;
577 int best_tq = -1;
578 uint32_t i;
579
580 info->first_seen = jiffies;
581 packet = (struct batadv_vis_packet *)info->skb_packet->data;
582 packet->vis_type = atomic_read(&bat_priv->vis_mode);
583
584 memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN);
585 packet->header.ttl = BATADV_TTL;
586 packet->seqno = htonl(ntohl(packet->seqno) + 1);
587 packet->entries = 0;
588 packet->reserved = 0;
589 skb_trim(info->skb_packet, sizeof(*packet));
590
591 if (packet->vis_type == BATADV_VIS_TYPE_CLIENT_UPDATE) {
592 best_tq = batadv_find_best_vis_server(bat_priv, info);
593
594 if (best_tq < 0)
595 return best_tq;
596 }
597
598 for (i = 0; i < hash->size; i++) {
599 head = &hash->table[i];
600
601 rcu_read_lock();
602 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
603 router = batadv_orig_node_get_router(orig_node);
604 if (!router)
605 continue;
606
607 if (!batadv_compare_eth(router->addr, orig_node->orig))
608 goto next;
609
610 if (router->if_incoming->if_status != BATADV_IF_ACTIVE)
611 goto next;
612
613 if (router->tq_avg < 1)
614 goto next;
615
616 /* fill one entry into buffer. */
617 packet_pos = skb_put(info->skb_packet, sizeof(*entry));
618 entry = (struct batadv_vis_info_entry *)packet_pos;
619 memcpy(entry->src,
620 router->if_incoming->net_dev->dev_addr,
621 ETH_ALEN);
622 memcpy(entry->dest, orig_node->orig, ETH_ALEN);
623 entry->quality = router->tq_avg;
624 packet->entries++;
625
626next:
627 batadv_neigh_node_free_ref(router);
628
629 if (batadv_vis_packet_full(info))
630 goto unlock;
631 }
632 rcu_read_unlock();
633 }
634
635 hash = bat_priv->tt.local_hash;
636
637 for (i = 0; i < hash->size; i++) {
638 head = &hash->table[i];
639
640 rcu_read_lock();
641 hlist_for_each_entry_rcu(tt_common_entry, head,
642 hash_entry) {
643 packet_pos = skb_put(info->skb_packet, sizeof(*entry));
644 entry = (struct batadv_vis_info_entry *)packet_pos;
645 memset(entry->src, 0, ETH_ALEN);
646 memcpy(entry->dest, tt_common_entry->addr, ETH_ALEN);
647 entry->quality = 0; /* 0 means TT */
648 packet->entries++;
649
650 if (batadv_vis_packet_full(info))
651 goto unlock;
652 }
653 rcu_read_unlock();
654 }
655
656 return 0;
657
658unlock:
659 rcu_read_unlock();
660 return 0;
661}
662
663/* free old vis packets. Must be called with this vis_hash_lock
664 * held
665 */
666static void batadv_purge_vis_packets(struct batadv_priv *bat_priv)
667{
668 uint32_t i;
669 struct batadv_hashtable *hash = bat_priv->vis.hash;
670 struct hlist_node *node_tmp;
671 struct hlist_head *head;
672 struct batadv_vis_info *info;
673
674 for (i = 0; i < hash->size; i++) {
675 head = &hash->table[i];
676
677 hlist_for_each_entry_safe(info, node_tmp,
678 head, hash_entry) {
679 /* never purge own data. */
680 if (info == bat_priv->vis.my_info)
681 continue;
682
683 if (batadv_has_timed_out(info->first_seen,
684 BATADV_VIS_TIMEOUT)) {
685 hlist_del(&info->hash_entry);
686 batadv_send_list_del(info);
687 kref_put(&info->refcount, batadv_free_info);
688 }
689 }
690 }
691}
692
693static void batadv_broadcast_vis_packet(struct batadv_priv *bat_priv,
694 struct batadv_vis_info *info)
695{
696 struct batadv_hashtable *hash = bat_priv->orig_hash;
697 struct hlist_head *head;
698 struct batadv_orig_node *orig_node;
699 struct batadv_vis_packet *packet;
700 struct sk_buff *skb;
701 uint32_t i, res;
702
703
704 packet = (struct batadv_vis_packet *)info->skb_packet->data;
705
706 /* send to all routers in range. */
707 for (i = 0; i < hash->size; i++) {
708 head = &hash->table[i];
709
710 rcu_read_lock();
711 hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
712 /* if it's a vis server and reachable, send it. */
713 if (!(orig_node->flags & BATADV_VIS_SERVER))
714 continue;
715
716 /* don't send it if we already received the packet from
717 * this node.
718 */
719 if (batadv_recv_list_is_in(bat_priv, &info->recv_list,
720 orig_node->orig))
721 continue;
722
723 memcpy(packet->target_orig, orig_node->orig, ETH_ALEN);
724 skb = skb_clone(info->skb_packet, GFP_ATOMIC);
725 if (!skb)
726 continue;
727
728 res = batadv_send_skb_to_orig(skb, orig_node, NULL);
729 if (res == NET_XMIT_DROP)
730 kfree_skb(skb);
731 }
732 rcu_read_unlock();
733 }
734}
735
736static void batadv_unicast_vis_packet(struct batadv_priv *bat_priv,
737 struct batadv_vis_info *info)
738{
739 struct batadv_orig_node *orig_node;
740 struct sk_buff *skb;
741 struct batadv_vis_packet *packet;
742
743 packet = (struct batadv_vis_packet *)info->skb_packet->data;
744
745 orig_node = batadv_orig_hash_find(bat_priv, packet->target_orig);
746 if (!orig_node)
747 goto out;
748
749 skb = skb_clone(info->skb_packet, GFP_ATOMIC);
750 if (!skb)
751 goto out;
752
753 if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP)
754 kfree_skb(skb);
755
756out:
757 if (orig_node)
758 batadv_orig_node_free_ref(orig_node);
759}
760
761/* only send one vis packet. called from batadv_send_vis_packets() */
762static void batadv_send_vis_packet(struct batadv_priv *bat_priv,
763 struct batadv_vis_info *info)
764{
765 struct batadv_hard_iface *primary_if;
766 struct batadv_vis_packet *packet;
767
768 primary_if = batadv_primary_if_get_selected(bat_priv);
769 if (!primary_if)
770 goto out;
771
772 packet = (struct batadv_vis_packet *)info->skb_packet->data;
773 if (packet->header.ttl < 2) {
774 pr_debug("Error - can't send vis packet: ttl exceeded\n");
775 goto out;
776 }
777
778 memcpy(packet->sender_orig, primary_if->net_dev->dev_addr, ETH_ALEN);
779 packet->header.ttl--;
780
781 if (is_broadcast_ether_addr(packet->target_orig))
782 batadv_broadcast_vis_packet(bat_priv, info);
783 else
784 batadv_unicast_vis_packet(bat_priv, info);
785 packet->header.ttl++; /* restore TTL */
786
787out:
788 if (primary_if)
789 batadv_hardif_free_ref(primary_if);
790}
791
792/* called from timer; send (and maybe generate) vis packet. */
793static void batadv_send_vis_packets(struct work_struct *work)
794{
795 struct delayed_work *delayed_work;
796 struct batadv_priv *bat_priv;
797 struct batadv_priv_vis *priv_vis;
798 struct batadv_vis_info *info;
799
800 delayed_work = container_of(work, struct delayed_work, work);
801 priv_vis = container_of(delayed_work, struct batadv_priv_vis, work);
802 bat_priv = container_of(priv_vis, struct batadv_priv, vis);
803 spin_lock_bh(&bat_priv->vis.hash_lock);
804 batadv_purge_vis_packets(bat_priv);
805
806 if (batadv_generate_vis_packet(bat_priv) == 0) {
807 /* schedule if generation was successful */
808 batadv_send_list_add(bat_priv, bat_priv->vis.my_info);
809 }
810
811 while (!list_empty(&bat_priv->vis.send_list)) {
812 info = list_first_entry(&bat_priv->vis.send_list,
813 typeof(*info), send_list);
814
815 kref_get(&info->refcount);
816 spin_unlock_bh(&bat_priv->vis.hash_lock);
817
818 batadv_send_vis_packet(bat_priv, info);
819
820 spin_lock_bh(&bat_priv->vis.hash_lock);
821 batadv_send_list_del(info);
822 kref_put(&info->refcount, batadv_free_info);
823 }
824 spin_unlock_bh(&bat_priv->vis.hash_lock);
825
826 queue_delayed_work(batadv_event_workqueue, &bat_priv->vis.work,
827 msecs_to_jiffies(BATADV_VIS_INTERVAL));
828}
829
830/* init the vis server. this may only be called when if_list is already
831 * initialized (e.g. bat0 is initialized, interfaces have been added)
832 */
833int batadv_vis_init(struct batadv_priv *bat_priv)
834{
835 struct batadv_vis_packet *packet;
836 int hash_added;
837 unsigned int len;
838 unsigned long first_seen;
839 struct sk_buff *tmp_skb;
840
841 if (bat_priv->vis.hash)
842 return 0;
843
844 spin_lock_bh(&bat_priv->vis.hash_lock);
845
846 bat_priv->vis.hash = batadv_hash_new(256);
847 if (!bat_priv->vis.hash) {
848 pr_err("Can't initialize vis_hash\n");
849 goto err;
850 }
851
852 batadv_hash_set_lock_class(bat_priv->vis.hash,
853 &batadv_vis_hash_lock_class_key);
854
855 bat_priv->vis.my_info = kmalloc(BATADV_MAX_VIS_PACKET_SIZE, GFP_ATOMIC);
856 if (!bat_priv->vis.my_info)
857 goto err;
858
859 len = sizeof(*packet) + BATADV_MAX_VIS_PACKET_SIZE + ETH_HLEN;
860 bat_priv->vis.my_info->skb_packet = netdev_alloc_skb_ip_align(NULL,
861 len);
862 if (!bat_priv->vis.my_info->skb_packet)
863 goto free_info;
864
865 bat_priv->vis.my_info->skb_packet->priority = TC_PRIO_CONTROL;
866 skb_reserve(bat_priv->vis.my_info->skb_packet, ETH_HLEN);
867 tmp_skb = bat_priv->vis.my_info->skb_packet;
868 packet = (struct batadv_vis_packet *)skb_put(tmp_skb, sizeof(*packet));
869
870 /* prefill the vis info */
871 first_seen = jiffies - msecs_to_jiffies(BATADV_VIS_INTERVAL);
872 bat_priv->vis.my_info->first_seen = first_seen;
873 INIT_LIST_HEAD(&bat_priv->vis.my_info->recv_list);
874 INIT_LIST_HEAD(&bat_priv->vis.my_info->send_list);
875 kref_init(&bat_priv->vis.my_info->refcount);
876 bat_priv->vis.my_info->bat_priv = bat_priv;
877 packet->header.version = BATADV_COMPAT_VERSION;
878 packet->header.packet_type = BATADV_VIS;
879 packet->header.ttl = BATADV_TTL;
880 packet->seqno = 0;
881 packet->reserved = 0;
882 packet->entries = 0;
883
884 INIT_LIST_HEAD(&bat_priv->vis.send_list);
885
886 hash_added = batadv_hash_add(bat_priv->vis.hash, batadv_vis_info_cmp,
887 batadv_vis_info_choose,
888 bat_priv->vis.my_info,
889 &bat_priv->vis.my_info->hash_entry);
890 if (hash_added != 0) {
891 pr_err("Can't add own vis packet into hash\n");
892 /* not in hash, need to remove it manually. */
893 kref_put(&bat_priv->vis.my_info->refcount, batadv_free_info);
894 goto err;
895 }
896
897 spin_unlock_bh(&bat_priv->vis.hash_lock);
898
899 INIT_DELAYED_WORK(&bat_priv->vis.work, batadv_send_vis_packets);
900 queue_delayed_work(batadv_event_workqueue, &bat_priv->vis.work,
901 msecs_to_jiffies(BATADV_VIS_INTERVAL));
902
903 return 0;
904
905free_info:
906 kfree(bat_priv->vis.my_info);
907 bat_priv->vis.my_info = NULL;
908err:
909 spin_unlock_bh(&bat_priv->vis.hash_lock);
910 batadv_vis_quit(bat_priv);
911 return -ENOMEM;
912}
913
914/* Decrease the reference count on a hash item info */
915static void batadv_free_info_ref(struct hlist_node *node, void *arg)
916{
917 struct batadv_vis_info *info;
918
919 info = container_of(node, struct batadv_vis_info, hash_entry);
920 batadv_send_list_del(info);
921 kref_put(&info->refcount, batadv_free_info);
922}
923
924/* shutdown vis-server */
925void batadv_vis_quit(struct batadv_priv *bat_priv)
926{
927 if (!bat_priv->vis.hash)
928 return;
929
930 cancel_delayed_work_sync(&bat_priv->vis.work);
931
932 spin_lock_bh(&bat_priv->vis.hash_lock);
933 /* properly remove, kill timers ... */
934 batadv_hash_delete(bat_priv->vis.hash, batadv_free_info_ref, NULL);
935 bat_priv->vis.hash = NULL;
936 bat_priv->vis.my_info = NULL;
937 spin_unlock_bh(&bat_priv->vis.hash_lock);
938}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-26 00:25:39 -0500