Commit | Line | Data |
---|---|---|
9cfc7bd6 | 1 | /* Copyright (C) 2008-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
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 | |
c6c8fea2 SE |
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 MAX_VIS_PACKET_SIZE 1000 | |
30 | ||
eaad8ad9 | 31 | static void batadv_start_vis_timer(struct bat_priv *bat_priv); |
c6c8fea2 SE |
32 | |
33 | /* free the info */ | |
eaad8ad9 | 34 | static void batadv_free_info(struct kref *ref) |
c6c8fea2 SE |
35 | { |
36 | struct vis_info *info = container_of(ref, struct vis_info, refcount); | |
37 | struct bat_priv *bat_priv = info->bat_priv; | |
38 | struct recvlist_node *entry, *tmp; | |
39 | ||
40 | list_del_init(&info->send_list); | |
41 | spin_lock_bh(&bat_priv->vis_list_lock); | |
42 | list_for_each_entry_safe(entry, tmp, &info->recv_list, list) { | |
43 | list_del(&entry->list); | |
44 | kfree(entry); | |
45 | } | |
46 | ||
47 | spin_unlock_bh(&bat_priv->vis_list_lock); | |
48 | kfree_skb(info->skb_packet); | |
dda9fc6b | 49 | kfree(info); |
c6c8fea2 SE |
50 | } |
51 | ||
52 | /* Compare two vis packets, used by the hashing algorithm */ | |
eaad8ad9 | 53 | static int batadv_vis_info_cmp(const struct hlist_node *node, const void *data2) |
c6c8fea2 | 54 | { |
747e4221 SE |
55 | const struct vis_info *d1, *d2; |
56 | const struct vis_packet *p1, *p2; | |
7aadf889 ML |
57 | |
58 | d1 = container_of(node, struct vis_info, hash_entry); | |
c6c8fea2 SE |
59 | d2 = data2; |
60 | p1 = (struct vis_packet *)d1->skb_packet->data; | |
61 | p2 = (struct vis_packet *)d2->skb_packet->data; | |
1eda58bf | 62 | return batadv_compare_eth(p1->vis_orig, p2->vis_orig); |
c6c8fea2 SE |
63 | } |
64 | ||
9cfc7bd6 SE |
65 | /* hash function to choose an entry in a hash table of given size |
66 | * hash algorithm from http://en.wikipedia.org/wiki/Hash_table | |
67 | */ | |
eaad8ad9 | 68 | static uint32_t batadv_vis_info_choose(const void *data, uint32_t size) |
c6c8fea2 | 69 | { |
747e4221 SE |
70 | const struct vis_info *vis_info = data; |
71 | const struct vis_packet *packet; | |
72 | const unsigned char *key; | |
c6c8fea2 SE |
73 | uint32_t hash = 0; |
74 | size_t i; | |
75 | ||
76 | packet = (struct vis_packet *)vis_info->skb_packet->data; | |
77 | key = packet->vis_orig; | |
78 | for (i = 0; i < ETH_ALEN; i++) { | |
79 | hash += key[i]; | |
80 | hash += (hash << 10); | |
81 | hash ^= (hash >> 6); | |
82 | } | |
83 | ||
84 | hash += (hash << 3); | |
85 | hash ^= (hash >> 11); | |
86 | hash += (hash << 15); | |
87 | ||
88 | return hash % size; | |
89 | } | |
90 | ||
eaad8ad9 SE |
91 | static struct vis_info *batadv_vis_hash_find(struct bat_priv *bat_priv, |
92 | const void *data) | |
7aadf889 ML |
93 | { |
94 | struct hashtable_t *hash = bat_priv->vis_hash; | |
95 | struct hlist_head *head; | |
96 | struct hlist_node *node; | |
97 | struct vis_info *vis_info, *vis_info_tmp = NULL; | |
c90681b8 | 98 | uint32_t index; |
7aadf889 ML |
99 | |
100 | if (!hash) | |
101 | return NULL; | |
102 | ||
eaad8ad9 | 103 | index = batadv_vis_info_choose(data, hash->size); |
7aadf889 ML |
104 | head = &hash->table[index]; |
105 | ||
106 | rcu_read_lock(); | |
107 | hlist_for_each_entry_rcu(vis_info, node, head, hash_entry) { | |
eaad8ad9 | 108 | if (!batadv_vis_info_cmp(node, data)) |
7aadf889 ML |
109 | continue; |
110 | ||
111 | vis_info_tmp = vis_info; | |
112 | break; | |
113 | } | |
114 | rcu_read_unlock(); | |
115 | ||
116 | return vis_info_tmp; | |
117 | } | |
118 | ||
c6c8fea2 | 119 | /* insert interface to the list of interfaces of one originator, if it |
9cfc7bd6 SE |
120 | * does not already exist in the list |
121 | */ | |
eaad8ad9 SE |
122 | static void batadv_vis_data_insert_interface(const uint8_t *interface, |
123 | struct hlist_head *if_list, | |
124 | bool primary) | |
c6c8fea2 SE |
125 | { |
126 | struct if_list_entry *entry; | |
127 | struct hlist_node *pos; | |
128 | ||
129 | hlist_for_each_entry(entry, pos, if_list, list) { | |
1eda58bf | 130 | if (batadv_compare_eth(entry->addr, interface)) |
c6c8fea2 SE |
131 | return; |
132 | } | |
133 | ||
015758d0 | 134 | /* it's a new address, add it to the list */ |
c6c8fea2 SE |
135 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
136 | if (!entry) | |
137 | return; | |
138 | memcpy(entry->addr, interface, ETH_ALEN); | |
139 | entry->primary = primary; | |
140 | hlist_add_head(&entry->list, if_list); | |
141 | } | |
142 | ||
eaad8ad9 | 143 | static ssize_t batadv_vis_prim_sec(char *buff, const struct hlist_head *if_list) |
c6c8fea2 SE |
144 | { |
145 | struct if_list_entry *entry; | |
146 | struct hlist_node *pos; | |
147 | size_t len = 0; | |
148 | ||
149 | hlist_for_each_entry(entry, pos, if_list, list) { | |
150 | if (entry->primary) | |
151 | len += sprintf(buff + len, "PRIMARY, "); | |
152 | else | |
153 | len += sprintf(buff + len, "SEC %pM, ", entry->addr); | |
154 | } | |
155 | ||
156 | return len; | |
157 | } | |
158 | ||
eaad8ad9 | 159 | static size_t batadv_vis_cnt_prim_sec(struct hlist_head *if_list) |
c6c8fea2 SE |
160 | { |
161 | struct if_list_entry *entry; | |
162 | struct hlist_node *pos; | |
163 | size_t count = 0; | |
164 | ||
165 | hlist_for_each_entry(entry, pos, if_list, list) { | |
166 | if (entry->primary) | |
167 | count += 9; | |
168 | else | |
169 | count += 23; | |
170 | } | |
171 | ||
172 | return count; | |
173 | } | |
174 | ||
175 | /* read an entry */ | |
eaad8ad9 SE |
176 | static ssize_t batadv_vis_data_read_entry(char *buff, |
177 | const struct vis_info_entry *entry, | |
178 | const uint8_t *src, bool primary) | |
c6c8fea2 SE |
179 | { |
180 | /* maximal length: max(4+17+2, 3+17+1+3+2) == 26 */ | |
181 | if (primary && entry->quality == 0) | |
2dafb49d | 182 | return sprintf(buff, "TT %pM, ", entry->dest); |
1eda58bf | 183 | else if (batadv_compare_eth(entry->src, src)) |
c6c8fea2 SE |
184 | return sprintf(buff, "TQ %pM %d, ", entry->dest, |
185 | entry->quality); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
d0f714f4 | 190 | int batadv_vis_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 | 191 | { |
32ae9b22 | 192 | struct hard_iface *primary_if; |
7aadf889 | 193 | struct hlist_node *node; |
c6c8fea2 | 194 | struct hlist_head *head; |
c6c8fea2 SE |
195 | struct vis_info *info; |
196 | struct vis_packet *packet; | |
197 | struct vis_info_entry *entries; | |
198 | struct net_device *net_dev = (struct net_device *)seq->private; | |
199 | struct bat_priv *bat_priv = netdev_priv(net_dev); | |
200 | struct hashtable_t *hash = bat_priv->vis_hash; | |
201 | HLIST_HEAD(vis_if_list); | |
202 | struct if_list_entry *entry; | |
203 | struct hlist_node *pos, *n; | |
c90681b8 AQ |
204 | uint32_t i; |
205 | int j, ret = 0; | |
c6c8fea2 SE |
206 | int vis_server = atomic_read(&bat_priv->vis_mode); |
207 | size_t buff_pos, buf_size; | |
208 | char *buff; | |
c6c8fea2 | 209 | |
e5d89254 | 210 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
211 | if (!primary_if) |
212 | goto out; | |
213 | ||
214 | if (vis_server == VIS_TYPE_CLIENT_UPDATE) | |
215 | goto out; | |
c6c8fea2 SE |
216 | |
217 | buf_size = 1; | |
218 | /* Estimate length */ | |
219 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
220 | for (i = 0; i < hash->size; i++) { | |
221 | head = &hash->table[i]; | |
222 | ||
7aadf889 ML |
223 | rcu_read_lock(); |
224 | hlist_for_each_entry_rcu(info, node, head, hash_entry) { | |
c6c8fea2 SE |
225 | packet = (struct vis_packet *)info->skb_packet->data; |
226 | entries = (struct vis_info_entry *) | |
704509b8 | 227 | ((char *)packet + sizeof(*packet)); |
c6c8fea2 | 228 | |
eaad8ad9 SE |
229 | batadv_vis_data_insert_interface(packet->vis_orig, |
230 | &vis_if_list, true); | |
beeb96a4 | 231 | |
c6c8fea2 SE |
232 | for (j = 0; j < packet->entries; j++) { |
233 | if (entries[j].quality == 0) | |
234 | continue; | |
1eda58bf SE |
235 | if (batadv_compare_eth(entries[j].src, |
236 | packet->vis_orig)) | |
beeb96a4 | 237 | continue; |
eaad8ad9 SE |
238 | batadv_vis_data_insert_interface(entries[j].src, |
239 | &vis_if_list, | |
240 | false); | |
c6c8fea2 SE |
241 | } |
242 | ||
243 | hlist_for_each_entry(entry, pos, &vis_if_list, list) { | |
244 | buf_size += 18 + 26 * packet->entries; | |
245 | ||
246 | /* add primary/secondary records */ | |
1eda58bf SE |
247 | if (batadv_compare_eth(entry->addr, |
248 | packet->vis_orig)) | |
c6c8fea2 | 249 | buf_size += |
eaad8ad9 | 250 | batadv_vis_cnt_prim_sec(&vis_if_list); |
c6c8fea2 SE |
251 | |
252 | buf_size += 1; | |
253 | } | |
254 | ||
255 | hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, | |
256 | list) { | |
257 | hlist_del(&entry->list); | |
258 | kfree(entry); | |
259 | } | |
260 | } | |
7aadf889 | 261 | rcu_read_unlock(); |
c6c8fea2 SE |
262 | } |
263 | ||
264 | buff = kmalloc(buf_size, GFP_ATOMIC); | |
265 | if (!buff) { | |
266 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
32ae9b22 ML |
267 | ret = -ENOMEM; |
268 | goto out; | |
c6c8fea2 SE |
269 | } |
270 | buff[0] = '\0'; | |
271 | buff_pos = 0; | |
272 | ||
273 | for (i = 0; i < hash->size; i++) { | |
274 | head = &hash->table[i]; | |
275 | ||
7aadf889 ML |
276 | rcu_read_lock(); |
277 | hlist_for_each_entry_rcu(info, node, head, hash_entry) { | |
c6c8fea2 SE |
278 | packet = (struct vis_packet *)info->skb_packet->data; |
279 | entries = (struct vis_info_entry *) | |
704509b8 | 280 | ((char *)packet + sizeof(*packet)); |
c6c8fea2 | 281 | |
eaad8ad9 SE |
282 | batadv_vis_data_insert_interface(packet->vis_orig, |
283 | &vis_if_list, true); | |
beeb96a4 | 284 | |
c6c8fea2 SE |
285 | for (j = 0; j < packet->entries; j++) { |
286 | if (entries[j].quality == 0) | |
287 | continue; | |
1eda58bf SE |
288 | if (batadv_compare_eth(entries[j].src, |
289 | packet->vis_orig)) | |
beeb96a4 | 290 | continue; |
eaad8ad9 SE |
291 | batadv_vis_data_insert_interface(entries[j].src, |
292 | &vis_if_list, | |
293 | false); | |
c6c8fea2 SE |
294 | } |
295 | ||
296 | hlist_for_each_entry(entry, pos, &vis_if_list, list) { | |
297 | buff_pos += sprintf(buff + buff_pos, "%pM,", | |
298 | entry->addr); | |
299 | ||
dd58ddc6 | 300 | for (j = 0; j < packet->entries; j++) |
eaad8ad9 | 301 | buff_pos += batadv_vis_data_read_entry( |
c6c8fea2 | 302 | buff + buff_pos, |
dd58ddc6 | 303 | &entries[j], |
c6c8fea2 SE |
304 | entry->addr, |
305 | entry->primary); | |
306 | ||
307 | /* add primary/secondary records */ | |
1eda58bf SE |
308 | if (batadv_compare_eth(entry->addr, |
309 | packet->vis_orig)) | |
c6c8fea2 | 310 | buff_pos += |
eaad8ad9 SE |
311 | batadv_vis_prim_sec(buff + buff_pos, |
312 | &vis_if_list); | |
c6c8fea2 SE |
313 | |
314 | buff_pos += sprintf(buff + buff_pos, "\n"); | |
315 | } | |
316 | ||
317 | hlist_for_each_entry_safe(entry, pos, n, &vis_if_list, | |
318 | list) { | |
319 | hlist_del(&entry->list); | |
320 | kfree(entry); | |
321 | } | |
322 | } | |
7aadf889 | 323 | rcu_read_unlock(); |
c6c8fea2 SE |
324 | } |
325 | ||
326 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
327 | ||
328 | seq_printf(seq, "%s", buff); | |
329 | kfree(buff); | |
330 | ||
32ae9b22 ML |
331 | out: |
332 | if (primary_if) | |
e5d89254 | 333 | batadv_hardif_free_ref(primary_if); |
32ae9b22 | 334 | return ret; |
c6c8fea2 SE |
335 | } |
336 | ||
337 | /* add the info packet to the send list, if it was not | |
9cfc7bd6 SE |
338 | * already linked in. |
339 | */ | |
eaad8ad9 SE |
340 | static void batadv_send_list_add(struct bat_priv *bat_priv, |
341 | struct vis_info *info) | |
c6c8fea2 SE |
342 | { |
343 | if (list_empty(&info->send_list)) { | |
344 | kref_get(&info->refcount); | |
345 | list_add_tail(&info->send_list, &bat_priv->vis_send_list); | |
346 | } | |
347 | } | |
348 | ||
349 | /* delete the info packet from the send list, if it was | |
9cfc7bd6 SE |
350 | * linked in. |
351 | */ | |
eaad8ad9 | 352 | static void batadv_send_list_del(struct vis_info *info) |
c6c8fea2 SE |
353 | { |
354 | if (!list_empty(&info->send_list)) { | |
355 | list_del_init(&info->send_list); | |
eaad8ad9 | 356 | kref_put(&info->refcount, batadv_free_info); |
c6c8fea2 SE |
357 | } |
358 | } | |
359 | ||
360 | /* tries to add one entry to the receive list. */ | |
eaad8ad9 SE |
361 | static void batadv_recv_list_add(struct bat_priv *bat_priv, |
362 | struct list_head *recv_list, const char *mac) | |
c6c8fea2 SE |
363 | { |
364 | struct recvlist_node *entry; | |
365 | ||
704509b8 | 366 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
c6c8fea2 SE |
367 | if (!entry) |
368 | return; | |
369 | ||
370 | memcpy(entry->mac, mac, ETH_ALEN); | |
371 | spin_lock_bh(&bat_priv->vis_list_lock); | |
372 | list_add_tail(&entry->list, recv_list); | |
373 | spin_unlock_bh(&bat_priv->vis_list_lock); | |
374 | } | |
375 | ||
376 | /* returns 1 if this mac is in the recv_list */ | |
eaad8ad9 SE |
377 | static int batadv_recv_list_is_in(struct bat_priv *bat_priv, |
378 | const struct list_head *recv_list, | |
379 | const char *mac) | |
c6c8fea2 | 380 | { |
747e4221 | 381 | const struct recvlist_node *entry; |
c6c8fea2 SE |
382 | |
383 | spin_lock_bh(&bat_priv->vis_list_lock); | |
384 | list_for_each_entry(entry, recv_list, list) { | |
1eda58bf | 385 | if (batadv_compare_eth(entry->mac, mac)) { |
c6c8fea2 SE |
386 | spin_unlock_bh(&bat_priv->vis_list_lock); |
387 | return 1; | |
388 | } | |
389 | } | |
390 | spin_unlock_bh(&bat_priv->vis_list_lock); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old, | |
395 | * broken.. ). vis hash must be locked outside. is_new is set when the packet | |
9cfc7bd6 SE |
396 | * is newer than old entries in the hash. |
397 | */ | |
eaad8ad9 SE |
398 | static struct vis_info *batadv_add_packet(struct bat_priv *bat_priv, |
399 | struct vis_packet *vis_packet, | |
400 | int vis_info_len, int *is_new, | |
401 | int make_broadcast) | |
c6c8fea2 SE |
402 | { |
403 | struct vis_info *info, *old_info; | |
404 | struct vis_packet *search_packet, *old_packet; | |
405 | struct vis_info search_elem; | |
406 | struct vis_packet *packet; | |
407 | int hash_added; | |
408 | ||
409 | *is_new = 0; | |
410 | /* sanity check */ | |
411 | if (!bat_priv->vis_hash) | |
412 | return NULL; | |
413 | ||
414 | /* see if the packet is already in vis_hash */ | |
704509b8 | 415 | search_elem.skb_packet = dev_alloc_skb(sizeof(*search_packet)); |
c6c8fea2 SE |
416 | if (!search_elem.skb_packet) |
417 | return NULL; | |
418 | search_packet = (struct vis_packet *)skb_put(search_elem.skb_packet, | |
704509b8 | 419 | sizeof(*search_packet)); |
c6c8fea2 SE |
420 | |
421 | memcpy(search_packet->vis_orig, vis_packet->vis_orig, ETH_ALEN); | |
eaad8ad9 | 422 | old_info = batadv_vis_hash_find(bat_priv, &search_elem); |
c6c8fea2 SE |
423 | kfree_skb(search_elem.skb_packet); |
424 | ||
425 | if (old_info) { | |
426 | old_packet = (struct vis_packet *)old_info->skb_packet->data; | |
3e34819e SE |
427 | if (!batadv_seq_after(ntohl(vis_packet->seqno), |
428 | ntohl(old_packet->seqno))) { | |
c6c8fea2 | 429 | if (old_packet->seqno == vis_packet->seqno) { |
eaad8ad9 SE |
430 | batadv_recv_list_add(bat_priv, |
431 | &old_info->recv_list, | |
432 | vis_packet->sender_orig); | |
c6c8fea2 SE |
433 | return old_info; |
434 | } else { | |
435 | /* newer packet is already in hash. */ | |
436 | return NULL; | |
437 | } | |
438 | } | |
439 | /* remove old entry */ | |
eaad8ad9 SE |
440 | batadv_hash_remove(bat_priv->vis_hash, batadv_vis_info_cmp, |
441 | batadv_vis_info_choose, old_info); | |
442 | batadv_send_list_del(old_info); | |
443 | kref_put(&old_info->refcount, batadv_free_info); | |
c6c8fea2 SE |
444 | } |
445 | ||
704509b8 | 446 | info = kmalloc(sizeof(*info), GFP_ATOMIC); |
c6c8fea2 SE |
447 | if (!info) |
448 | return NULL; | |
449 | ||
704509b8 | 450 | info->skb_packet = dev_alloc_skb(sizeof(*packet) + vis_info_len + |
0d125074 | 451 | ETH_HLEN); |
c6c8fea2 SE |
452 | if (!info->skb_packet) { |
453 | kfree(info); | |
454 | return NULL; | |
455 | } | |
0d125074 | 456 | skb_reserve(info->skb_packet, ETH_HLEN); |
704509b8 SE |
457 | packet = (struct vis_packet *)skb_put(info->skb_packet, sizeof(*packet) |
458 | + vis_info_len); | |
c6c8fea2 SE |
459 | |
460 | kref_init(&info->refcount); | |
461 | INIT_LIST_HEAD(&info->send_list); | |
462 | INIT_LIST_HEAD(&info->recv_list); | |
463 | info->first_seen = jiffies; | |
464 | info->bat_priv = bat_priv; | |
704509b8 | 465 | memcpy(packet, vis_packet, sizeof(*packet) + vis_info_len); |
c6c8fea2 SE |
466 | |
467 | /* initialize and add new packet. */ | |
468 | *is_new = 1; | |
469 | ||
470 | /* Make it a broadcast packet, if required */ | |
471 | if (make_broadcast) | |
3193e8fd | 472 | memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN); |
c6c8fea2 SE |
473 | |
474 | /* repair if entries is longer than packet. */ | |
475 | if (packet->entries * sizeof(struct vis_info_entry) > vis_info_len) | |
476 | packet->entries = vis_info_len / sizeof(struct vis_info_entry); | |
477 | ||
eaad8ad9 | 478 | batadv_recv_list_add(bat_priv, &info->recv_list, packet->sender_orig); |
c6c8fea2 SE |
479 | |
480 | /* try to add it */ | |
eaad8ad9 SE |
481 | hash_added = batadv_hash_add(bat_priv->vis_hash, batadv_vis_info_cmp, |
482 | batadv_vis_info_choose, info, | |
483 | &info->hash_entry); | |
1a1f37d9 | 484 | if (hash_added != 0) { |
c6c8fea2 | 485 | /* did not work (for some reason) */ |
eaad8ad9 | 486 | kref_put(&info->refcount, batadv_free_info); |
c6c8fea2 SE |
487 | info = NULL; |
488 | } | |
489 | ||
490 | return info; | |
491 | } | |
492 | ||
493 | /* handle the server sync packet, forward if needed. */ | |
d0f714f4 SE |
494 | void batadv_receive_server_sync_packet(struct bat_priv *bat_priv, |
495 | struct vis_packet *vis_packet, | |
496 | int vis_info_len) | |
c6c8fea2 SE |
497 | { |
498 | struct vis_info *info; | |
499 | int is_new, make_broadcast; | |
500 | int vis_server = atomic_read(&bat_priv->vis_mode); | |
501 | ||
502 | make_broadcast = (vis_server == VIS_TYPE_SERVER_SYNC); | |
503 | ||
504 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 SE |
505 | info = batadv_add_packet(bat_priv, vis_packet, vis_info_len, |
506 | &is_new, make_broadcast); | |
c6c8fea2 SE |
507 | if (!info) |
508 | goto end; | |
509 | ||
510 | /* only if we are server ourselves and packet is newer than the one in | |
9cfc7bd6 SE |
511 | * hash. |
512 | */ | |
c6c8fea2 | 513 | if (vis_server == VIS_TYPE_SERVER_SYNC && is_new) |
eaad8ad9 | 514 | batadv_send_list_add(bat_priv, info); |
c6c8fea2 SE |
515 | end: |
516 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
517 | } | |
518 | ||
519 | /* handle an incoming client update packet and schedule forward if needed. */ | |
d0f714f4 SE |
520 | void batadv_receive_client_update_packet(struct bat_priv *bat_priv, |
521 | struct vis_packet *vis_packet, | |
522 | int vis_info_len) | |
c6c8fea2 SE |
523 | { |
524 | struct vis_info *info; | |
525 | struct vis_packet *packet; | |
526 | int is_new; | |
527 | int vis_server = atomic_read(&bat_priv->vis_mode); | |
528 | int are_target = 0; | |
529 | ||
530 | /* clients shall not broadcast. */ | |
531 | if (is_broadcast_ether_addr(vis_packet->target_orig)) | |
532 | return; | |
533 | ||
534 | /* Are we the target for this VIS packet? */ | |
535 | if (vis_server == VIS_TYPE_SERVER_SYNC && | |
3193e8fd | 536 | batadv_is_my_mac(vis_packet->target_orig)) |
c6c8fea2 SE |
537 | are_target = 1; |
538 | ||
539 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 SE |
540 | info = batadv_add_packet(bat_priv, vis_packet, vis_info_len, |
541 | &is_new, are_target); | |
c6c8fea2 SE |
542 | |
543 | if (!info) | |
544 | goto end; | |
545 | /* note that outdated packets will be dropped at this point. */ | |
546 | ||
547 | packet = (struct vis_packet *)info->skb_packet->data; | |
548 | ||
549 | /* send only if we're the target server or ... */ | |
550 | if (are_target && is_new) { | |
551 | packet->vis_type = VIS_TYPE_SERVER_SYNC; /* upgrade! */ | |
eaad8ad9 | 552 | batadv_send_list_add(bat_priv, info); |
c6c8fea2 SE |
553 | |
554 | /* ... we're not the recipient (and thus need to forward). */ | |
3193e8fd | 555 | } else if (!batadv_is_my_mac(packet->target_orig)) { |
eaad8ad9 | 556 | batadv_send_list_add(bat_priv, info); |
c6c8fea2 SE |
557 | } |
558 | ||
559 | end: | |
560 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
561 | } | |
562 | ||
563 | /* Walk the originators and find the VIS server with the best tq. Set the packet | |
564 | * address to its address and return the best_tq. | |
565 | * | |
9cfc7bd6 SE |
566 | * Must be called with the originator hash locked |
567 | */ | |
eaad8ad9 SE |
568 | static int batadv_find_best_vis_server(struct bat_priv *bat_priv, |
569 | struct vis_info *info) | |
c6c8fea2 SE |
570 | { |
571 | struct hashtable_t *hash = bat_priv->orig_hash; | |
e1a5382f | 572 | struct neigh_node *router; |
7aadf889 | 573 | struct hlist_node *node; |
c6c8fea2 | 574 | struct hlist_head *head; |
c6c8fea2 SE |
575 | struct orig_node *orig_node; |
576 | struct vis_packet *packet; | |
c90681b8 AQ |
577 | int best_tq = -1; |
578 | uint32_t i; | |
c6c8fea2 SE |
579 | |
580 | packet = (struct vis_packet *)info->skb_packet->data; | |
581 | ||
582 | for (i = 0; i < hash->size; i++) { | |
583 | head = &hash->table[i]; | |
584 | ||
fb778ea1 | 585 | rcu_read_lock(); |
7aadf889 | 586 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
7d211efc | 587 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
588 | if (!router) |
589 | continue; | |
590 | ||
591 | if ((orig_node->flags & VIS_SERVER) && | |
592 | (router->tq_avg > best_tq)) { | |
593 | best_tq = router->tq_avg; | |
c6c8fea2 SE |
594 | memcpy(packet->target_orig, orig_node->orig, |
595 | ETH_ALEN); | |
596 | } | |
7d211efc | 597 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 598 | } |
fb778ea1 | 599 | rcu_read_unlock(); |
c6c8fea2 SE |
600 | } |
601 | ||
602 | return best_tq; | |
603 | } | |
604 | ||
605 | /* Return true if the vis packet is full. */ | |
eaad8ad9 | 606 | static bool batadv_vis_packet_full(const struct vis_info *info) |
c6c8fea2 | 607 | { |
747e4221 | 608 | const struct vis_packet *packet; |
c6c8fea2 SE |
609 | packet = (struct vis_packet *)info->skb_packet->data; |
610 | ||
611 | if (MAX_VIS_PACKET_SIZE / sizeof(struct vis_info_entry) | |
612 | < packet->entries + 1) | |
613 | return true; | |
614 | return false; | |
615 | } | |
616 | ||
617 | /* generates a packet of own vis data, | |
9cfc7bd6 SE |
618 | * returns 0 on success, -1 if no packet could be generated |
619 | */ | |
eaad8ad9 | 620 | static int batadv_generate_vis_packet(struct bat_priv *bat_priv) |
c6c8fea2 SE |
621 | { |
622 | struct hashtable_t *hash = bat_priv->orig_hash; | |
7aadf889 | 623 | struct hlist_node *node; |
c6c8fea2 | 624 | struct hlist_head *head; |
c6c8fea2 | 625 | struct orig_node *orig_node; |
e1a5382f | 626 | struct neigh_node *router; |
958ca598 | 627 | struct vis_info *info = bat_priv->my_vis_info; |
c6c8fea2 SE |
628 | struct vis_packet *packet = (struct vis_packet *)info->skb_packet->data; |
629 | struct vis_info_entry *entry; | |
48100bac | 630 | struct tt_common_entry *tt_common_entry; |
c90681b8 AQ |
631 | int best_tq = -1; |
632 | uint32_t i; | |
c6c8fea2 SE |
633 | |
634 | info->first_seen = jiffies; | |
635 | packet->vis_type = atomic_read(&bat_priv->vis_mode); | |
636 | ||
3193e8fd | 637 | memcpy(packet->target_orig, batadv_broadcast_addr, ETH_ALEN); |
76543d14 | 638 | packet->header.ttl = TTL; |
c6c8fea2 SE |
639 | packet->seqno = htonl(ntohl(packet->seqno) + 1); |
640 | packet->entries = 0; | |
704509b8 | 641 | skb_trim(info->skb_packet, sizeof(*packet)); |
c6c8fea2 SE |
642 | |
643 | if (packet->vis_type == VIS_TYPE_CLIENT_UPDATE) { | |
eaad8ad9 | 644 | best_tq = batadv_find_best_vis_server(bat_priv, info); |
c6c8fea2 | 645 | |
d0072609 | 646 | if (best_tq < 0) |
5346c35e | 647 | return best_tq; |
c6c8fea2 SE |
648 | } |
649 | ||
650 | for (i = 0; i < hash->size; i++) { | |
651 | head = &hash->table[i]; | |
652 | ||
fb778ea1 | 653 | rcu_read_lock(); |
7aadf889 | 654 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
7d211efc | 655 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 656 | if (!router) |
c6c8fea2 SE |
657 | continue; |
658 | ||
1eda58bf | 659 | if (!batadv_compare_eth(router->addr, orig_node->orig)) |
e1a5382f | 660 | goto next; |
c6c8fea2 | 661 | |
e1a5382f LL |
662 | if (router->if_incoming->if_status != IF_ACTIVE) |
663 | goto next; | |
c6c8fea2 | 664 | |
e1a5382f LL |
665 | if (router->tq_avg < 1) |
666 | goto next; | |
c6c8fea2 SE |
667 | |
668 | /* fill one entry into buffer. */ | |
669 | entry = (struct vis_info_entry *) | |
670 | skb_put(info->skb_packet, sizeof(*entry)); | |
671 | memcpy(entry->src, | |
e1a5382f | 672 | router->if_incoming->net_dev->dev_addr, |
c6c8fea2 SE |
673 | ETH_ALEN); |
674 | memcpy(entry->dest, orig_node->orig, ETH_ALEN); | |
e1a5382f | 675 | entry->quality = router->tq_avg; |
c6c8fea2 SE |
676 | packet->entries++; |
677 | ||
e1a5382f | 678 | next: |
7d211efc | 679 | batadv_neigh_node_free_ref(router); |
e1a5382f | 680 | |
eaad8ad9 | 681 | if (batadv_vis_packet_full(info)) |
d0072609 | 682 | goto unlock; |
c6c8fea2 | 683 | } |
fb778ea1 | 684 | rcu_read_unlock(); |
c6c8fea2 SE |
685 | } |
686 | ||
2dafb49d | 687 | hash = bat_priv->tt_local_hash; |
c6c8fea2 | 688 | |
c6c8fea2 SE |
689 | for (i = 0; i < hash->size; i++) { |
690 | head = &hash->table[i]; | |
691 | ||
7683fdc1 | 692 | rcu_read_lock(); |
48100bac | 693 | hlist_for_each_entry_rcu(tt_common_entry, node, head, |
7683fdc1 | 694 | hash_entry) { |
c6c8fea2 SE |
695 | entry = (struct vis_info_entry *) |
696 | skb_put(info->skb_packet, | |
697 | sizeof(*entry)); | |
698 | memset(entry->src, 0, ETH_ALEN); | |
48100bac | 699 | memcpy(entry->dest, tt_common_entry->addr, ETH_ALEN); |
2dafb49d | 700 | entry->quality = 0; /* 0 means TT */ |
c6c8fea2 SE |
701 | packet->entries++; |
702 | ||
eaad8ad9 | 703 | if (batadv_vis_packet_full(info)) |
7683fdc1 | 704 | goto unlock; |
c6c8fea2 | 705 | } |
7683fdc1 | 706 | rcu_read_unlock(); |
c6c8fea2 SE |
707 | } |
708 | ||
c6c8fea2 | 709 | return 0; |
d0072609 ML |
710 | |
711 | unlock: | |
712 | rcu_read_unlock(); | |
713 | return 0; | |
c6c8fea2 SE |
714 | } |
715 | ||
716 | /* free old vis packets. Must be called with this vis_hash_lock | |
9cfc7bd6 SE |
717 | * held |
718 | */ | |
eaad8ad9 | 719 | static void batadv_purge_vis_packets(struct bat_priv *bat_priv) |
c6c8fea2 | 720 | { |
c90681b8 | 721 | uint32_t i; |
c6c8fea2 | 722 | struct hashtable_t *hash = bat_priv->vis_hash; |
7aadf889 | 723 | struct hlist_node *node, *node_tmp; |
c6c8fea2 | 724 | struct hlist_head *head; |
c6c8fea2 SE |
725 | struct vis_info *info; |
726 | ||
727 | for (i = 0; i < hash->size; i++) { | |
728 | head = &hash->table[i]; | |
729 | ||
7aadf889 ML |
730 | hlist_for_each_entry_safe(info, node, node_tmp, |
731 | head, hash_entry) { | |
c6c8fea2 SE |
732 | /* never purge own data. */ |
733 | if (info == bat_priv->my_vis_info) | |
734 | continue; | |
735 | ||
1eda58bf SE |
736 | if (batadv_has_timed_out(info->first_seen, |
737 | VIS_TIMEOUT)) { | |
7aadf889 | 738 | hlist_del(node); |
eaad8ad9 SE |
739 | batadv_send_list_del(info); |
740 | kref_put(&info->refcount, batadv_free_info); | |
c6c8fea2 SE |
741 | } |
742 | } | |
743 | } | |
744 | } | |
745 | ||
eaad8ad9 SE |
746 | static void batadv_broadcast_vis_packet(struct bat_priv *bat_priv, |
747 | struct vis_info *info) | |
c6c8fea2 | 748 | { |
e1a5382f | 749 | struct neigh_node *router; |
c6c8fea2 | 750 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 751 | struct hlist_node *node; |
c6c8fea2 | 752 | struct hlist_head *head; |
c6c8fea2 SE |
753 | struct orig_node *orig_node; |
754 | struct vis_packet *packet; | |
755 | struct sk_buff *skb; | |
e6c10f43 | 756 | struct hard_iface *hard_iface; |
c6c8fea2 | 757 | uint8_t dstaddr[ETH_ALEN]; |
c90681b8 | 758 | uint32_t i; |
c6c8fea2 SE |
759 | |
760 | ||
c6c8fea2 SE |
761 | packet = (struct vis_packet *)info->skb_packet->data; |
762 | ||
763 | /* send to all routers in range. */ | |
764 | for (i = 0; i < hash->size; i++) { | |
765 | head = &hash->table[i]; | |
766 | ||
fb778ea1 | 767 | rcu_read_lock(); |
7aadf889 | 768 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
c6c8fea2 | 769 | /* if it's a vis server and reachable, send it. */ |
c6c8fea2 SE |
770 | if (!(orig_node->flags & VIS_SERVER)) |
771 | continue; | |
e1a5382f | 772 | |
7d211efc | 773 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
774 | if (!router) |
775 | continue; | |
776 | ||
c6c8fea2 | 777 | /* don't send it if we already received the packet from |
9cfc7bd6 SE |
778 | * this node. |
779 | */ | |
eaad8ad9 SE |
780 | if (batadv_recv_list_is_in(bat_priv, &info->recv_list, |
781 | orig_node->orig)) { | |
7d211efc | 782 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 783 | continue; |
e1a5382f | 784 | } |
c6c8fea2 SE |
785 | |
786 | memcpy(packet->target_orig, orig_node->orig, ETH_ALEN); | |
e1a5382f LL |
787 | hard_iface = router->if_incoming; |
788 | memcpy(dstaddr, router->addr, ETH_ALEN); | |
789 | ||
7d211efc | 790 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
791 | |
792 | skb = skb_clone(info->skb_packet, GFP_ATOMIC); | |
793 | if (skb) | |
9455e34c SE |
794 | batadv_send_skb_packet(skb, hard_iface, |
795 | dstaddr); | |
c6c8fea2 | 796 | |
c6c8fea2 | 797 | } |
fb778ea1 | 798 | rcu_read_unlock(); |
c6c8fea2 | 799 | } |
c6c8fea2 SE |
800 | } |
801 | ||
eaad8ad9 SE |
802 | static void batadv_unicast_vis_packet(struct bat_priv *bat_priv, |
803 | struct vis_info *info) | |
c6c8fea2 SE |
804 | { |
805 | struct orig_node *orig_node; | |
e1a5382f | 806 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
807 | struct sk_buff *skb; |
808 | struct vis_packet *packet; | |
c6c8fea2 | 809 | |
c6c8fea2 | 810 | packet = (struct vis_packet *)info->skb_packet->data; |
c6c8fea2 | 811 | |
da641193 | 812 | orig_node = batadv_orig_hash_find(bat_priv, packet->target_orig); |
44524fcd | 813 | if (!orig_node) |
e1a5382f | 814 | goto out; |
44524fcd | 815 | |
7d211efc | 816 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
817 | if (!router) |
818 | goto out; | |
c6c8fea2 SE |
819 | |
820 | skb = skb_clone(info->skb_packet, GFP_ATOMIC); | |
821 | if (skb) | |
9455e34c | 822 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
c6c8fea2 SE |
823 | |
824 | out: | |
e1a5382f | 825 | if (router) |
7d211efc | 826 | batadv_neigh_node_free_ref(router); |
44524fcd | 827 | if (orig_node) |
7d211efc | 828 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
829 | } |
830 | ||
eaad8ad9 SE |
831 | /* only send one vis packet. called from batadv_send_vis_packets() */ |
832 | static void batadv_send_vis_packet(struct bat_priv *bat_priv, | |
833 | struct vis_info *info) | |
c6c8fea2 | 834 | { |
32ae9b22 | 835 | struct hard_iface *primary_if; |
c6c8fea2 SE |
836 | struct vis_packet *packet; |
837 | ||
e5d89254 | 838 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 ML |
839 | if (!primary_if) |
840 | goto out; | |
841 | ||
c6c8fea2 | 842 | packet = (struct vis_packet *)info->skb_packet->data; |
76543d14 | 843 | if (packet->header.ttl < 2) { |
c6c8fea2 | 844 | pr_debug("Error - can't send vis packet: ttl exceeded\n"); |
32ae9b22 | 845 | goto out; |
c6c8fea2 SE |
846 | } |
847 | ||
32ae9b22 | 848 | memcpy(packet->sender_orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
76543d14 | 849 | packet->header.ttl--; |
c6c8fea2 SE |
850 | |
851 | if (is_broadcast_ether_addr(packet->target_orig)) | |
eaad8ad9 | 852 | batadv_broadcast_vis_packet(bat_priv, info); |
c6c8fea2 | 853 | else |
eaad8ad9 | 854 | batadv_unicast_vis_packet(bat_priv, info); |
76543d14 | 855 | packet->header.ttl++; /* restore TTL */ |
32ae9b22 ML |
856 | |
857 | out: | |
858 | if (primary_if) | |
e5d89254 | 859 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 SE |
860 | } |
861 | ||
862 | /* called from timer; send (and maybe generate) vis packet. */ | |
eaad8ad9 | 863 | static void batadv_send_vis_packets(struct work_struct *work) |
c6c8fea2 SE |
864 | { |
865 | struct delayed_work *delayed_work = | |
866 | container_of(work, struct delayed_work, work); | |
867 | struct bat_priv *bat_priv = | |
868 | container_of(delayed_work, struct bat_priv, vis_work); | |
1181e1da | 869 | struct vis_info *info; |
c6c8fea2 SE |
870 | |
871 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 | 872 | batadv_purge_vis_packets(bat_priv); |
c6c8fea2 | 873 | |
eaad8ad9 | 874 | if (batadv_generate_vis_packet(bat_priv) == 0) { |
c6c8fea2 | 875 | /* schedule if generation was successful */ |
eaad8ad9 | 876 | batadv_send_list_add(bat_priv, bat_priv->my_vis_info); |
c6c8fea2 SE |
877 | } |
878 | ||
1181e1da SE |
879 | while (!list_empty(&bat_priv->vis_send_list)) { |
880 | info = list_first_entry(&bat_priv->vis_send_list, | |
881 | typeof(*info), send_list); | |
c6c8fea2 SE |
882 | |
883 | kref_get(&info->refcount); | |
884 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
885 | ||
eaad8ad9 | 886 | batadv_send_vis_packet(bat_priv, info); |
c6c8fea2 SE |
887 | |
888 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 SE |
889 | batadv_send_list_del(info); |
890 | kref_put(&info->refcount, batadv_free_info); | |
c6c8fea2 SE |
891 | } |
892 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 | 893 | batadv_start_vis_timer(bat_priv); |
c6c8fea2 SE |
894 | } |
895 | ||
896 | /* init the vis server. this may only be called when if_list is already | |
9cfc7bd6 SE |
897 | * initialized (e.g. bat0 is initialized, interfaces have been added) |
898 | */ | |
d0f714f4 | 899 | int batadv_vis_init(struct bat_priv *bat_priv) |
c6c8fea2 SE |
900 | { |
901 | struct vis_packet *packet; | |
902 | int hash_added; | |
903 | ||
904 | if (bat_priv->vis_hash) | |
5346c35e | 905 | return 0; |
c6c8fea2 SE |
906 | |
907 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
908 | ||
1a8eaf07 | 909 | bat_priv->vis_hash = batadv_hash_new(256); |
c6c8fea2 SE |
910 | if (!bat_priv->vis_hash) { |
911 | pr_err("Can't initialize vis_hash\n"); | |
912 | goto err; | |
913 | } | |
914 | ||
915 | bat_priv->my_vis_info = kmalloc(MAX_VIS_PACKET_SIZE, GFP_ATOMIC); | |
320f422f | 916 | if (!bat_priv->my_vis_info) |
c6c8fea2 | 917 | goto err; |
c6c8fea2 | 918 | |
704509b8 SE |
919 | bat_priv->my_vis_info->skb_packet = dev_alloc_skb(sizeof(*packet) + |
920 | MAX_VIS_PACKET_SIZE + | |
0d125074 | 921 | ETH_HLEN); |
c6c8fea2 SE |
922 | if (!bat_priv->my_vis_info->skb_packet) |
923 | goto free_info; | |
924 | ||
0d125074 | 925 | skb_reserve(bat_priv->my_vis_info->skb_packet, ETH_HLEN); |
704509b8 SE |
926 | packet = (struct vis_packet *)skb_put(bat_priv->my_vis_info->skb_packet, |
927 | sizeof(*packet)); | |
c6c8fea2 SE |
928 | |
929 | /* prefill the vis info */ | |
930 | bat_priv->my_vis_info->first_seen = jiffies - | |
931 | msecs_to_jiffies(VIS_INTERVAL); | |
932 | INIT_LIST_HEAD(&bat_priv->my_vis_info->recv_list); | |
933 | INIT_LIST_HEAD(&bat_priv->my_vis_info->send_list); | |
934 | kref_init(&bat_priv->my_vis_info->refcount); | |
935 | bat_priv->my_vis_info->bat_priv = bat_priv; | |
76543d14 SE |
936 | packet->header.version = COMPAT_VERSION; |
937 | packet->header.packet_type = BAT_VIS; | |
938 | packet->header.ttl = TTL; | |
c6c8fea2 SE |
939 | packet->seqno = 0; |
940 | packet->entries = 0; | |
941 | ||
942 | INIT_LIST_HEAD(&bat_priv->vis_send_list); | |
943 | ||
eaad8ad9 SE |
944 | hash_added = batadv_hash_add(bat_priv->vis_hash, batadv_vis_info_cmp, |
945 | batadv_vis_info_choose, | |
946 | bat_priv->my_vis_info, | |
c0a55929 | 947 | &bat_priv->my_vis_info->hash_entry); |
1a1f37d9 | 948 | if (hash_added != 0) { |
c6c8fea2 SE |
949 | pr_err("Can't add own vis packet into hash\n"); |
950 | /* not in hash, need to remove it manually. */ | |
eaad8ad9 | 951 | kref_put(&bat_priv->my_vis_info->refcount, batadv_free_info); |
c6c8fea2 SE |
952 | goto err; |
953 | } | |
954 | ||
955 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
eaad8ad9 | 956 | batadv_start_vis_timer(bat_priv); |
5346c35e | 957 | return 0; |
c6c8fea2 SE |
958 | |
959 | free_info: | |
960 | kfree(bat_priv->my_vis_info); | |
961 | bat_priv->my_vis_info = NULL; | |
962 | err: | |
963 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
d0f714f4 | 964 | batadv_vis_quit(bat_priv); |
5346c35e | 965 | return -ENOMEM; |
c6c8fea2 SE |
966 | } |
967 | ||
968 | /* Decrease the reference count on a hash item info */ | |
eaad8ad9 | 969 | static void batadv_free_info_ref(struct hlist_node *node, void *arg) |
c6c8fea2 | 970 | { |
7aadf889 | 971 | struct vis_info *info; |
c6c8fea2 | 972 | |
7aadf889 | 973 | info = container_of(node, struct vis_info, hash_entry); |
eaad8ad9 SE |
974 | batadv_send_list_del(info); |
975 | kref_put(&info->refcount, batadv_free_info); | |
c6c8fea2 SE |
976 | } |
977 | ||
978 | /* shutdown vis-server */ | |
d0f714f4 | 979 | void batadv_vis_quit(struct bat_priv *bat_priv) |
c6c8fea2 SE |
980 | { |
981 | if (!bat_priv->vis_hash) | |
982 | return; | |
983 | ||
984 | cancel_delayed_work_sync(&bat_priv->vis_work); | |
985 | ||
986 | spin_lock_bh(&bat_priv->vis_hash_lock); | |
987 | /* properly remove, kill timers ... */ | |
eaad8ad9 | 988 | batadv_hash_delete(bat_priv->vis_hash, batadv_free_info_ref, NULL); |
c6c8fea2 SE |
989 | bat_priv->vis_hash = NULL; |
990 | bat_priv->my_vis_info = NULL; | |
991 | spin_unlock_bh(&bat_priv->vis_hash_lock); | |
992 | } | |
993 | ||
994 | /* schedule packets for (re)transmission */ | |
eaad8ad9 | 995 | static void batadv_start_vis_timer(struct bat_priv *bat_priv) |
c6c8fea2 | 996 | { |
eaad8ad9 | 997 | INIT_DELAYED_WORK(&bat_priv->vis_work, batadv_send_vis_packets); |
3193e8fd | 998 | queue_delayed_work(batadv_event_workqueue, &bat_priv->vis_work, |
c6c8fea2 SE |
999 | msecs_to_jiffies(VIS_INTERVAL)); |
1000 | } |