]>
Commit | Line | Data |
---|---|---|
c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "routing.h" | |
24 | #include "send.h" | |
25 | #include "hash.h" | |
26 | #include "soft-interface.h" | |
27 | #include "hard-interface.h" | |
28 | #include "icmp_socket.h" | |
29 | #include "translation-table.h" | |
30 | #include "originator.h" | |
c6c8fea2 SE |
31 | #include "ring_buffer.h" |
32 | #include "vis.h" | |
33 | #include "aggregation.h" | |
34 | #include "gateway_common.h" | |
35 | #include "gateway_client.h" | |
36 | #include "unicast.h" | |
37 | ||
e6c10f43 | 38 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 39 | { |
e6c10f43 | 40 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 41 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 42 | struct hlist_node *node; |
c6c8fea2 | 43 | struct hlist_head *head; |
c6c8fea2 SE |
44 | struct orig_node *orig_node; |
45 | unsigned long *word; | |
46 | int i; | |
47 | size_t word_index; | |
48 | ||
c6c8fea2 SE |
49 | for (i = 0; i < hash->size; i++) { |
50 | head = &hash->table[i]; | |
51 | ||
fb778ea1 | 52 | rcu_read_lock(); |
7aadf889 | 53 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 54 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
e6c10f43 | 55 | word_index = hard_iface->if_num * NUM_WORDS; |
c6c8fea2 SE |
56 | word = &(orig_node->bcast_own[word_index]); |
57 | ||
58 | bit_get_packet(bat_priv, word, 1, 0); | |
e6c10f43 | 59 | orig_node->bcast_own_sum[hard_iface->if_num] = |
c6c8fea2 | 60 | bit_packet_count(word); |
2ae2daf6 | 61 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 62 | } |
fb778ea1 | 63 | rcu_read_unlock(); |
c6c8fea2 | 64 | } |
c6c8fea2 SE |
65 | } |
66 | ||
67 | static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
68 | unsigned char *hna_buff, int hna_buff_len) | |
69 | { | |
70 | if ((hna_buff_len != orig_node->hna_buff_len) || | |
71 | ((hna_buff_len > 0) && | |
72 | (orig_node->hna_buff_len > 0) && | |
73 | (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { | |
74 | ||
75 | if (orig_node->hna_buff_len > 0) | |
76 | hna_global_del_orig(bat_priv, orig_node, | |
77 | "originator changed hna"); | |
78 | ||
79 | if ((hna_buff_len > 0) && (hna_buff)) | |
80 | hna_global_add_orig(bat_priv, orig_node, | |
81 | hna_buff, hna_buff_len); | |
82 | } | |
83 | } | |
84 | ||
85 | static void update_route(struct bat_priv *bat_priv, | |
86 | struct orig_node *orig_node, | |
87 | struct neigh_node *neigh_node, | |
88 | unsigned char *hna_buff, int hna_buff_len) | |
89 | { | |
a8e7f4bc ML |
90 | struct neigh_node *neigh_node_tmp; |
91 | ||
c6c8fea2 SE |
92 | /* route deleted */ |
93 | if ((orig_node->router) && (!neigh_node)) { | |
94 | ||
95 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", | |
96 | orig_node->orig); | |
97 | hna_global_del_orig(bat_priv, orig_node, | |
98 | "originator timed out"); | |
99 | ||
100 | /* route added */ | |
101 | } else if ((!orig_node->router) && (neigh_node)) { | |
102 | ||
103 | bat_dbg(DBG_ROUTES, bat_priv, | |
104 | "Adding route towards: %pM (via %pM)\n", | |
105 | orig_node->orig, neigh_node->addr); | |
106 | hna_global_add_orig(bat_priv, orig_node, | |
107 | hna_buff, hna_buff_len); | |
108 | ||
109 | /* route changed */ | |
110 | } else { | |
111 | bat_dbg(DBG_ROUTES, bat_priv, | |
112 | "Changing route towards: %pM " | |
113 | "(now via %pM - was via %pM)\n", | |
114 | orig_node->orig, neigh_node->addr, | |
115 | orig_node->router->addr); | |
116 | } | |
117 | ||
44524fcd ML |
118 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
119 | neigh_node = NULL; | |
a8e7f4bc | 120 | neigh_node_tmp = orig_node->router; |
c6c8fea2 | 121 | orig_node->router = neigh_node; |
a8e7f4bc | 122 | if (neigh_node_tmp) |
44524fcd | 123 | neigh_node_free_ref(neigh_node_tmp); |
c6c8fea2 SE |
124 | } |
125 | ||
126 | ||
127 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
128 | struct neigh_node *neigh_node, unsigned char *hna_buff, | |
129 | int hna_buff_len) | |
130 | { | |
131 | ||
132 | if (!orig_node) | |
133 | return; | |
134 | ||
135 | if (orig_node->router != neigh_node) | |
136 | update_route(bat_priv, orig_node, neigh_node, | |
137 | hna_buff, hna_buff_len); | |
138 | /* may be just HNA changed */ | |
139 | else | |
140 | update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len); | |
141 | } | |
142 | ||
143 | static int is_bidirectional_neigh(struct orig_node *orig_node, | |
144 | struct orig_node *orig_neigh_node, | |
145 | struct batman_packet *batman_packet, | |
e6c10f43 | 146 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
147 | { |
148 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1605d0d6 | 149 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; |
9591a79f | 150 | struct hlist_node *node; |
c6c8fea2 | 151 | unsigned char total_count; |
0ede9f41 ML |
152 | uint8_t orig_eq_count, neigh_rq_count, tq_own; |
153 | int tq_asym_penalty, ret = 0; | |
c6c8fea2 SE |
154 | |
155 | if (orig_node == orig_neigh_node) { | |
f987ed6e ML |
156 | rcu_read_lock(); |
157 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
158 | &orig_node->neigh_list, list) { | |
c6c8fea2 | 159 | |
1605d0d6 ML |
160 | if (!compare_eth(tmp_neigh_node->addr, |
161 | orig_neigh_node->orig)) | |
162 | continue; | |
163 | ||
164 | if (tmp_neigh_node->if_incoming != if_incoming) | |
165 | continue; | |
166 | ||
167 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
168 | continue; | |
169 | ||
170 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 171 | } |
1605d0d6 | 172 | rcu_read_unlock(); |
c6c8fea2 SE |
173 | |
174 | if (!neigh_node) | |
175 | neigh_node = create_neighbor(orig_node, | |
176 | orig_neigh_node, | |
177 | orig_neigh_node->orig, | |
178 | if_incoming); | |
c6c8fea2 | 179 | if (!neigh_node) |
1605d0d6 | 180 | goto out; |
c6c8fea2 SE |
181 | |
182 | neigh_node->last_valid = jiffies; | |
183 | } else { | |
184 | /* find packet count of corresponding one hop neighbor */ | |
f987ed6e ML |
185 | rcu_read_lock(); |
186 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
187 | &orig_neigh_node->neigh_list, list) { | |
c6c8fea2 | 188 | |
1605d0d6 ML |
189 | if (!compare_eth(tmp_neigh_node->addr, |
190 | orig_neigh_node->orig)) | |
191 | continue; | |
192 | ||
193 | if (tmp_neigh_node->if_incoming != if_incoming) | |
194 | continue; | |
195 | ||
196 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
197 | continue; | |
198 | ||
199 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 200 | } |
1605d0d6 | 201 | rcu_read_unlock(); |
c6c8fea2 SE |
202 | |
203 | if (!neigh_node) | |
204 | neigh_node = create_neighbor(orig_neigh_node, | |
205 | orig_neigh_node, | |
206 | orig_neigh_node->orig, | |
207 | if_incoming); | |
c6c8fea2 | 208 | if (!neigh_node) |
1605d0d6 | 209 | goto out; |
c6c8fea2 SE |
210 | } |
211 | ||
212 | orig_node->last_valid = jiffies; | |
213 | ||
0ede9f41 ML |
214 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
215 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
216 | neigh_rq_count = neigh_node->real_packet_count; | |
217 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
218 | ||
c6c8fea2 | 219 | /* pay attention to not get a value bigger than 100 % */ |
0ede9f41 ML |
220 | total_count = (orig_eq_count > neigh_rq_count ? |
221 | neigh_rq_count : orig_eq_count); | |
c6c8fea2 SE |
222 | |
223 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
224 | /* if we receive too few packets it is not considered bidirectional */ | |
225 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
0ede9f41 ML |
226 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
227 | tq_own = 0; | |
c6c8fea2 SE |
228 | else |
229 | /* neigh_node->real_packet_count is never zero as we | |
230 | * only purge old information when getting new | |
231 | * information */ | |
0ede9f41 | 232 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
c6c8fea2 SE |
233 | |
234 | /* | |
235 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does | |
236 | * affect the nearly-symmetric links only a little, but | |
237 | * punishes asymmetric links more. This will give a value | |
238 | * between 0 and TQ_MAX_VALUE | |
239 | */ | |
0ede9f41 ML |
240 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
241 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
242 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
243 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
244 | (TQ_LOCAL_WINDOW_SIZE * | |
245 | TQ_LOCAL_WINDOW_SIZE * | |
246 | TQ_LOCAL_WINDOW_SIZE); | |
247 | ||
248 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / | |
249 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
c6c8fea2 SE |
250 | |
251 | bat_dbg(DBG_BATMAN, bat_priv, | |
252 | "bidirectional: " | |
253 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
254 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
255 | "total tq: %3i\n", | |
256 | orig_node->orig, orig_neigh_node->orig, total_count, | |
0ede9f41 | 257 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
c6c8fea2 SE |
258 | |
259 | /* if link has the minimum required transmission quality | |
260 | * consider it bidirectional */ | |
261 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
a775eb84 ML |
262 | ret = 1; |
263 | ||
a775eb84 ML |
264 | out: |
265 | if (neigh_node) | |
44524fcd | 266 | neigh_node_free_ref(neigh_node); |
a775eb84 | 267 | return ret; |
c6c8fea2 SE |
268 | } |
269 | ||
a4c135c5 SW |
270 | /* caller must hold the neigh_list_lock */ |
271 | void bonding_candidate_del(struct orig_node *orig_node, | |
272 | struct neigh_node *neigh_node) | |
273 | { | |
274 | /* this neighbor is not part of our candidate list */ | |
275 | if (list_empty(&neigh_node->bonding_list)) | |
276 | goto out; | |
277 | ||
278 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 279 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 280 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
281 | atomic_dec(&orig_node->bond_candidates); |
282 | ||
283 | out: | |
284 | return; | |
285 | } | |
286 | ||
287 | static void bonding_candidate_add(struct orig_node *orig_node, | |
288 | struct neigh_node *neigh_node) | |
289 | { | |
290 | struct hlist_node *node; | |
291 | struct neigh_node *tmp_neigh_node; | |
292 | uint8_t best_tq, interference_candidate = 0; | |
293 | ||
294 | spin_lock_bh(&orig_node->neigh_list_lock); | |
295 | ||
296 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
297 | if (!compare_eth(orig_node->orig, |
298 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
299 | goto candidate_del; |
300 | ||
301 | if (!orig_node->router) | |
302 | goto candidate_del; | |
303 | ||
304 | best_tq = orig_node->router->tq_avg; | |
305 | ||
306 | /* ... and is good enough to be considered */ | |
307 | if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) | |
308 | goto candidate_del; | |
309 | ||
310 | /** | |
311 | * check if we have another candidate with the same mac address or | |
312 | * interface. If we do, we won't select this candidate because of | |
313 | * possible interference. | |
314 | */ | |
315 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
316 | &orig_node->neigh_list, list) { | |
317 | ||
318 | if (tmp_neigh_node == neigh_node) | |
319 | continue; | |
320 | ||
321 | /* we only care if the other candidate is even | |
322 | * considered as candidate. */ | |
323 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
324 | continue; | |
325 | ||
326 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 327 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
328 | interference_candidate = 1; |
329 | break; | |
330 | } | |
331 | } | |
332 | ||
333 | /* don't care further if it is an interference candidate */ | |
334 | if (interference_candidate) | |
335 | goto candidate_del; | |
336 | ||
337 | /* this neighbor already is part of our candidate list */ | |
338 | if (!list_empty(&neigh_node->bonding_list)) | |
339 | goto out; | |
340 | ||
44524fcd ML |
341 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
342 | goto out; | |
343 | ||
a4c135c5 | 344 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
345 | atomic_inc(&orig_node->bond_candidates); |
346 | goto out; | |
347 | ||
348 | candidate_del: | |
349 | bonding_candidate_del(orig_node, neigh_node); | |
350 | ||
351 | out: | |
352 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
353 | return; | |
354 | } | |
355 | ||
356 | /* copy primary address for bonding */ | |
357 | static void bonding_save_primary(struct orig_node *orig_node, | |
358 | struct orig_node *orig_neigh_node, | |
359 | struct batman_packet *batman_packet) | |
360 | { | |
361 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) | |
362 | return; | |
363 | ||
364 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
365 | } | |
366 | ||
c6c8fea2 SE |
367 | static void update_orig(struct bat_priv *bat_priv, |
368 | struct orig_node *orig_node, | |
369 | struct ethhdr *ethhdr, | |
370 | struct batman_packet *batman_packet, | |
e6c10f43 | 371 | struct hard_iface *if_incoming, |
c6c8fea2 SE |
372 | unsigned char *hna_buff, int hna_buff_len, |
373 | char is_duplicate) | |
374 | { | |
375 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
2ae2daf6 | 376 | struct orig_node *orig_node_tmp; |
9591a79f | 377 | struct hlist_node *node; |
c6c8fea2 | 378 | int tmp_hna_buff_len; |
2ae2daf6 | 379 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
c6c8fea2 SE |
380 | |
381 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " | |
382 | "Searching and updating originator entry of received packet\n"); | |
383 | ||
f987ed6e ML |
384 | rcu_read_lock(); |
385 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
386 | &orig_node->neigh_list, list) { | |
39901e71 | 387 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
44524fcd ML |
388 | (tmp_neigh_node->if_incoming == if_incoming) && |
389 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
390 | if (neigh_node) | |
391 | neigh_node_free_ref(neigh_node); | |
c6c8fea2 SE |
392 | neigh_node = tmp_neigh_node; |
393 | continue; | |
394 | } | |
395 | ||
396 | if (is_duplicate) | |
397 | continue; | |
398 | ||
399 | ring_buffer_set(tmp_neigh_node->tq_recv, | |
400 | &tmp_neigh_node->tq_index, 0); | |
401 | tmp_neigh_node->tq_avg = | |
402 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
403 | } | |
404 | ||
405 | if (!neigh_node) { | |
406 | struct orig_node *orig_tmp; | |
407 | ||
408 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
409 | if (!orig_tmp) | |
a775eb84 | 410 | goto unlock; |
c6c8fea2 SE |
411 | |
412 | neigh_node = create_neighbor(orig_node, orig_tmp, | |
413 | ethhdr->h_source, if_incoming); | |
16b1aba8 | 414 | |
7b36e8ee | 415 | orig_node_free_ref(orig_tmp); |
c6c8fea2 | 416 | if (!neigh_node) |
a775eb84 | 417 | goto unlock; |
c6c8fea2 SE |
418 | } else |
419 | bat_dbg(DBG_BATMAN, bat_priv, | |
420 | "Updating existing last-hop neighbor of originator\n"); | |
421 | ||
a775eb84 ML |
422 | rcu_read_unlock(); |
423 | ||
c6c8fea2 SE |
424 | orig_node->flags = batman_packet->flags; |
425 | neigh_node->last_valid = jiffies; | |
426 | ||
427 | ring_buffer_set(neigh_node->tq_recv, | |
428 | &neigh_node->tq_index, | |
429 | batman_packet->tq); | |
430 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
431 | ||
432 | if (!is_duplicate) { | |
433 | orig_node->last_ttl = batman_packet->ttl; | |
434 | neigh_node->last_ttl = batman_packet->ttl; | |
435 | } | |
436 | ||
a4c135c5 SW |
437 | bonding_candidate_add(orig_node, neigh_node); |
438 | ||
c6c8fea2 SE |
439 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
440 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); | |
441 | ||
442 | /* if this neighbor already is our next hop there is nothing | |
443 | * to change */ | |
444 | if (orig_node->router == neigh_node) | |
445 | goto update_hna; | |
446 | ||
447 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
448 | if ((orig_node->router) && | |
449 | (orig_node->router->tq_avg > neigh_node->tq_avg)) | |
450 | goto update_hna; | |
451 | ||
452 | /* if the TQ is the same and the link not more symetric we | |
453 | * won't consider it either */ | |
454 | if ((orig_node->router) && | |
2ae2daf6 ML |
455 | (neigh_node->tq_avg == orig_node->router->tq_avg)) { |
456 | orig_node_tmp = orig_node->router->orig_node; | |
457 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
458 | bcast_own_sum_orig = | |
459 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
460 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
461 | ||
462 | orig_node_tmp = neigh_node->orig_node; | |
463 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
464 | bcast_own_sum_neigh = | |
465 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
466 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
467 | ||
468 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
469 | goto update_hna; | |
470 | } | |
c6c8fea2 SE |
471 | |
472 | update_routes(bat_priv, orig_node, neigh_node, | |
473 | hna_buff, tmp_hna_buff_len); | |
474 | goto update_gw; | |
475 | ||
476 | update_hna: | |
477 | update_routes(bat_priv, orig_node, orig_node->router, | |
478 | hna_buff, tmp_hna_buff_len); | |
479 | ||
480 | update_gw: | |
481 | if (orig_node->gw_flags != batman_packet->gw_flags) | |
482 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); | |
483 | ||
484 | orig_node->gw_flags = batman_packet->gw_flags; | |
485 | ||
486 | /* restart gateway selection if fast or late switching was enabled */ | |
487 | if ((orig_node->gw_flags) && | |
488 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
489 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
490 | gw_check_election(bat_priv, orig_node); | |
a775eb84 ML |
491 | |
492 | goto out; | |
493 | ||
494 | unlock: | |
495 | rcu_read_unlock(); | |
496 | out: | |
497 | if (neigh_node) | |
44524fcd | 498 | neigh_node_free_ref(neigh_node); |
c6c8fea2 SE |
499 | } |
500 | ||
501 | /* checks whether the host restarted and is in the protection time. | |
502 | * returns: | |
503 | * 0 if the packet is to be accepted | |
504 | * 1 if the packet is to be ignored. | |
505 | */ | |
506 | static int window_protected(struct bat_priv *bat_priv, | |
507 | int32_t seq_num_diff, | |
508 | unsigned long *last_reset) | |
509 | { | |
510 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) | |
511 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
512 | if (time_after(jiffies, *last_reset + | |
513 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
514 | ||
515 | *last_reset = jiffies; | |
516 | bat_dbg(DBG_BATMAN, bat_priv, | |
517 | "old packet received, start protection\n"); | |
518 | ||
519 | return 0; | |
520 | } else | |
521 | return 1; | |
522 | } | |
523 | return 0; | |
524 | } | |
525 | ||
526 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
527 | * finds out whether it is a duplicate. | |
528 | * returns: | |
529 | * 1 the packet is a duplicate | |
530 | * 0 the packet has not yet been received | |
531 | * -1 the packet is old and has been received while the seqno window | |
532 | * was protected. Caller should drop it. | |
533 | */ | |
534 | static char count_real_packets(struct ethhdr *ethhdr, | |
535 | struct batman_packet *batman_packet, | |
e6c10f43 | 536 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
537 | { |
538 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
539 | struct orig_node *orig_node; | |
540 | struct neigh_node *tmp_neigh_node; | |
9591a79f | 541 | struct hlist_node *node; |
c6c8fea2 SE |
542 | char is_duplicate = 0; |
543 | int32_t seq_diff; | |
544 | int need_update = 0; | |
0ede9f41 | 545 | int set_mark, ret = -1; |
c6c8fea2 SE |
546 | |
547 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
548 | if (!orig_node) | |
549 | return 0; | |
550 | ||
0ede9f41 | 551 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 SE |
552 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
553 | ||
554 | /* signalize caller that the packet is to be dropped. */ | |
555 | if (window_protected(bat_priv, seq_diff, | |
556 | &orig_node->batman_seqno_reset)) | |
0ede9f41 | 557 | goto out; |
c6c8fea2 | 558 | |
f987ed6e ML |
559 | rcu_read_lock(); |
560 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
561 | &orig_node->neigh_list, list) { | |
c6c8fea2 SE |
562 | |
563 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, | |
564 | orig_node->last_real_seqno, | |
565 | batman_packet->seqno); | |
566 | ||
39901e71 | 567 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
c6c8fea2 SE |
568 | (tmp_neigh_node->if_incoming == if_incoming)) |
569 | set_mark = 1; | |
570 | else | |
571 | set_mark = 0; | |
572 | ||
573 | /* if the window moved, set the update flag. */ | |
574 | need_update |= bit_get_packet(bat_priv, | |
575 | tmp_neigh_node->real_bits, | |
576 | seq_diff, set_mark); | |
577 | ||
578 | tmp_neigh_node->real_packet_count = | |
579 | bit_packet_count(tmp_neigh_node->real_bits); | |
580 | } | |
f987ed6e | 581 | rcu_read_unlock(); |
c6c8fea2 SE |
582 | |
583 | if (need_update) { | |
584 | bat_dbg(DBG_BATMAN, bat_priv, | |
585 | "updating last_seqno: old %d, new %d\n", | |
586 | orig_node->last_real_seqno, batman_packet->seqno); | |
587 | orig_node->last_real_seqno = batman_packet->seqno; | |
588 | } | |
589 | ||
0ede9f41 | 590 | ret = is_duplicate; |
16b1aba8 | 591 | |
0ede9f41 ML |
592 | out: |
593 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7b36e8ee | 594 | orig_node_free_ref(orig_node); |
0ede9f41 | 595 | return ret; |
c6c8fea2 SE |
596 | } |
597 | ||
c6c8fea2 | 598 | void receive_bat_packet(struct ethhdr *ethhdr, |
a4c135c5 SW |
599 | struct batman_packet *batman_packet, |
600 | unsigned char *hna_buff, int hna_buff_len, | |
e6c10f43 | 601 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
602 | { |
603 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
e6c10f43 | 604 | struct hard_iface *hard_iface; |
c6c8fea2 SE |
605 | struct orig_node *orig_neigh_node, *orig_node; |
606 | char has_directlink_flag; | |
607 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
608 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
609 | char is_duplicate; | |
610 | uint32_t if_incoming_seqno; | |
611 | ||
612 | /* Silently drop when the batman packet is actually not a | |
613 | * correct packet. | |
614 | * | |
615 | * This might happen if a packet is padded (e.g. Ethernet has a | |
616 | * minimum frame length of 64 byte) and the aggregation interprets | |
617 | * it as an additional length. | |
618 | * | |
619 | * TODO: A more sane solution would be to have a bit in the | |
620 | * batman_packet to detect whether the packet is the last | |
621 | * packet in an aggregation. Here we expect that the padding | |
622 | * is always zero (or not 0x01) | |
623 | */ | |
624 | if (batman_packet->packet_type != BAT_PACKET) | |
625 | return; | |
626 | ||
627 | /* could be changed by schedule_own_packet() */ | |
628 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
629 | ||
630 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); | |
631 | ||
39901e71 ML |
632 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
633 | batman_packet->orig) ? 1 : 0); | |
c6c8fea2 SE |
634 | |
635 | bat_dbg(DBG_BATMAN, bat_priv, | |
636 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " | |
637 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " | |
638 | "TTL %d, V %d, IDF %d)\n", | |
639 | ethhdr->h_source, if_incoming->net_dev->name, | |
640 | if_incoming->net_dev->dev_addr, batman_packet->orig, | |
641 | batman_packet->prev_sender, batman_packet->seqno, | |
642 | batman_packet->tq, batman_packet->ttl, batman_packet->version, | |
643 | has_directlink_flag); | |
644 | ||
645 | rcu_read_lock(); | |
e6c10f43 ML |
646 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
647 | if (hard_iface->if_status != IF_ACTIVE) | |
c6c8fea2 SE |
648 | continue; |
649 | ||
e6c10f43 | 650 | if (hard_iface->soft_iface != if_incoming->soft_iface) |
c6c8fea2 SE |
651 | continue; |
652 | ||
39901e71 | 653 | if (compare_eth(ethhdr->h_source, |
e6c10f43 | 654 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
655 | is_my_addr = 1; |
656 | ||
39901e71 | 657 | if (compare_eth(batman_packet->orig, |
e6c10f43 | 658 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
659 | is_my_orig = 1; |
660 | ||
39901e71 | 661 | if (compare_eth(batman_packet->prev_sender, |
e6c10f43 | 662 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
663 | is_my_oldorig = 1; |
664 | ||
39901e71 | 665 | if (compare_eth(ethhdr->h_source, broadcast_addr)) |
c6c8fea2 SE |
666 | is_broadcast = 1; |
667 | } | |
668 | rcu_read_unlock(); | |
669 | ||
670 | if (batman_packet->version != COMPAT_VERSION) { | |
671 | bat_dbg(DBG_BATMAN, bat_priv, | |
672 | "Drop packet: incompatible batman version (%i)\n", | |
673 | batman_packet->version); | |
674 | return; | |
675 | } | |
676 | ||
677 | if (is_my_addr) { | |
678 | bat_dbg(DBG_BATMAN, bat_priv, | |
679 | "Drop packet: received my own broadcast (sender: %pM" | |
680 | ")\n", | |
681 | ethhdr->h_source); | |
682 | return; | |
683 | } | |
684 | ||
685 | if (is_broadcast) { | |
686 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
687 | "ignoring all packets with broadcast source addr (sender: %pM" | |
688 | ")\n", ethhdr->h_source); | |
689 | return; | |
690 | } | |
691 | ||
692 | if (is_my_orig) { | |
693 | unsigned long *word; | |
694 | int offset; | |
695 | ||
696 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
c6c8fea2 SE |
697 | if (!orig_neigh_node) |
698 | return; | |
699 | ||
700 | /* neighbor has to indicate direct link and it has to | |
701 | * come via the corresponding interface */ | |
702 | /* if received seqno equals last send seqno save new | |
703 | * seqno for bidirectional check */ | |
704 | if (has_directlink_flag && | |
39901e71 ML |
705 | compare_eth(if_incoming->net_dev->dev_addr, |
706 | batman_packet->orig) && | |
c6c8fea2 SE |
707 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
708 | offset = if_incoming->if_num * NUM_WORDS; | |
2ae2daf6 ML |
709 | |
710 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
c6c8fea2 SE |
711 | word = &(orig_neigh_node->bcast_own[offset]); |
712 | bit_mark(word, 0); | |
713 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
714 | bit_packet_count(word); | |
2ae2daf6 | 715 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
c6c8fea2 SE |
716 | } |
717 | ||
718 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
719 | "originator packet from myself (via neighbor)\n"); | |
7b36e8ee | 720 | orig_node_free_ref(orig_neigh_node); |
c6c8fea2 SE |
721 | return; |
722 | } | |
723 | ||
724 | if (is_my_oldorig) { | |
725 | bat_dbg(DBG_BATMAN, bat_priv, | |
726 | "Drop packet: ignoring all rebroadcast echos (sender: " | |
727 | "%pM)\n", ethhdr->h_source); | |
728 | return; | |
729 | } | |
730 | ||
731 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
732 | if (!orig_node) | |
733 | return; | |
734 | ||
735 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
736 | ||
737 | if (is_duplicate == -1) { | |
738 | bat_dbg(DBG_BATMAN, bat_priv, | |
739 | "Drop packet: packet within seqno protection time " | |
740 | "(sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 741 | goto out; |
c6c8fea2 SE |
742 | } |
743 | ||
744 | if (batman_packet->tq == 0) { | |
745 | bat_dbg(DBG_BATMAN, bat_priv, | |
746 | "Drop packet: originator packet with tq equal 0\n"); | |
16b1aba8 | 747 | goto out; |
c6c8fea2 SE |
748 | } |
749 | ||
750 | /* avoid temporary routing loops */ | |
751 | if ((orig_node->router) && | |
752 | (orig_node->router->orig_node->router) && | |
39901e71 ML |
753 | (compare_eth(orig_node->router->addr, |
754 | batman_packet->prev_sender)) && | |
755 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && | |
756 | (compare_eth(orig_node->router->addr, | |
757 | orig_node->router->orig_node->router->addr))) { | |
c6c8fea2 SE |
758 | bat_dbg(DBG_BATMAN, bat_priv, |
759 | "Drop packet: ignoring all rebroadcast packets that " | |
760 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 761 | goto out; |
c6c8fea2 SE |
762 | } |
763 | ||
764 | /* if sender is a direct neighbor the sender mac equals | |
765 | * originator mac */ | |
766 | orig_neigh_node = (is_single_hop_neigh ? | |
767 | orig_node : | |
768 | get_orig_node(bat_priv, ethhdr->h_source)); | |
769 | if (!orig_neigh_node) | |
d0072609 | 770 | goto out; |
c6c8fea2 SE |
771 | |
772 | /* drop packet if sender is not a direct neighbor and if we | |
773 | * don't route towards it */ | |
774 | if (!is_single_hop_neigh && (!orig_neigh_node->router)) { | |
775 | bat_dbg(DBG_BATMAN, bat_priv, | |
776 | "Drop packet: OGM via unknown neighbor!\n"); | |
16b1aba8 | 777 | goto out_neigh; |
c6c8fea2 SE |
778 | } |
779 | ||
780 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, | |
781 | batman_packet, if_incoming); | |
782 | ||
a4c135c5 SW |
783 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
784 | ||
c6c8fea2 SE |
785 | /* update ranking if it is not a duplicate or has the same |
786 | * seqno and similar ttl as the non-duplicate */ | |
787 | if (is_bidirectional && | |
788 | (!is_duplicate || | |
789 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
790 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
791 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, | |
792 | if_incoming, hna_buff, hna_buff_len, is_duplicate); | |
793 | ||
c6c8fea2 SE |
794 | /* is single hop (direct) neighbor */ |
795 | if (is_single_hop_neigh) { | |
796 | ||
797 | /* mark direct link on incoming interface */ | |
798 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
799 | 1, hna_buff_len, if_incoming); | |
800 | ||
801 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " | |
802 | "rebroadcast neighbor packet with direct link flag\n"); | |
16b1aba8 | 803 | goto out_neigh; |
c6c8fea2 SE |
804 | } |
805 | ||
806 | /* multihop originator */ | |
807 | if (!is_bidirectional) { | |
808 | bat_dbg(DBG_BATMAN, bat_priv, | |
809 | "Drop packet: not received via bidirectional link\n"); | |
16b1aba8 | 810 | goto out_neigh; |
c6c8fea2 SE |
811 | } |
812 | ||
813 | if (is_duplicate) { | |
814 | bat_dbg(DBG_BATMAN, bat_priv, | |
815 | "Drop packet: duplicate packet received\n"); | |
16b1aba8 | 816 | goto out_neigh; |
c6c8fea2 SE |
817 | } |
818 | ||
819 | bat_dbg(DBG_BATMAN, bat_priv, | |
820 | "Forwarding packet: rebroadcast originator packet\n"); | |
821 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
822 | 0, hna_buff_len, if_incoming); | |
16b1aba8 ML |
823 | |
824 | out_neigh: | |
7b36e8ee ML |
825 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
826 | orig_node_free_ref(orig_neigh_node); | |
16b1aba8 | 827 | out: |
7b36e8ee | 828 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
829 | } |
830 | ||
e6c10f43 | 831 | int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 832 | { |
c6c8fea2 SE |
833 | struct ethhdr *ethhdr; |
834 | ||
835 | /* drop packet if it has not necessary minimum size */ | |
836 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) | |
837 | return NET_RX_DROP; | |
838 | ||
839 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
840 | ||
841 | /* packet with broadcast indication but unicast recipient */ | |
842 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
843 | return NET_RX_DROP; | |
844 | ||
845 | /* packet with broadcast sender address */ | |
846 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
847 | return NET_RX_DROP; | |
848 | ||
849 | /* create a copy of the skb, if needed, to modify it. */ | |
850 | if (skb_cow(skb, 0) < 0) | |
851 | return NET_RX_DROP; | |
852 | ||
853 | /* keep skb linear */ | |
854 | if (skb_linearize(skb) < 0) | |
855 | return NET_RX_DROP; | |
856 | ||
857 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
858 | ||
c6c8fea2 SE |
859 | receive_aggr_bat_packet(ethhdr, |
860 | skb->data, | |
861 | skb_headlen(skb), | |
e6c10f43 | 862 | hard_iface); |
c6c8fea2 SE |
863 | |
864 | kfree_skb(skb); | |
865 | return NET_RX_SUCCESS; | |
866 | } | |
867 | ||
868 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
869 | struct sk_buff *skb, size_t icmp_len) | |
870 | { | |
44524fcd ML |
871 | struct orig_node *orig_node = NULL; |
872 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 873 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 874 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
875 | |
876 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
877 | |
878 | /* add data to device queue */ | |
879 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
880 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 881 | goto out; |
c6c8fea2 SE |
882 | } |
883 | ||
884 | if (!bat_priv->primary_if) | |
44524fcd | 885 | goto out; |
c6c8fea2 SE |
886 | |
887 | /* answer echo request (ping) */ | |
888 | /* get routing information */ | |
fb778ea1 | 889 | rcu_read_lock(); |
7aadf889 | 890 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
c6c8fea2 | 891 | |
44524fcd ML |
892 | if (!orig_node) |
893 | goto unlock; | |
c6c8fea2 | 894 | |
44524fcd | 895 | neigh_node = orig_node->router; |
c6c8fea2 | 896 | |
44524fcd ML |
897 | if (!neigh_node) |
898 | goto unlock; | |
c6c8fea2 | 899 | |
44524fcd ML |
900 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { |
901 | neigh_node = NULL; | |
902 | goto unlock; | |
903 | } | |
c6c8fea2 | 904 | |
44524fcd | 905 | rcu_read_unlock(); |
c6c8fea2 | 906 | |
44524fcd ML |
907 | /* create a copy of the skb, if needed, to modify it. */ |
908 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
909 | goto out; | |
910 | ||
911 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
912 | ||
913 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
914 | memcpy(icmp_packet->orig, | |
915 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
916 | icmp_packet->msg_type = ECHO_REPLY; | |
917 | icmp_packet->ttl = TTL; | |
918 | ||
d0072609 | 919 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
920 | ret = NET_RX_SUCCESS; |
921 | goto out; | |
c6c8fea2 | 922 | |
44524fcd ML |
923 | unlock: |
924 | rcu_read_unlock(); | |
44524fcd ML |
925 | out: |
926 | if (neigh_node) | |
927 | neigh_node_free_ref(neigh_node); | |
928 | if (orig_node) | |
7b36e8ee | 929 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
930 | return ret; |
931 | } | |
932 | ||
933 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 934 | struct sk_buff *skb) |
c6c8fea2 | 935 | { |
44524fcd ML |
936 | struct orig_node *orig_node = NULL; |
937 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 938 | struct icmp_packet *icmp_packet; |
44524fcd | 939 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
940 | |
941 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
942 | |
943 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
944 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
945 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
946 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
947 | icmp_packet->dst); | |
44524fcd | 948 | goto out; |
c6c8fea2 SE |
949 | } |
950 | ||
951 | if (!bat_priv->primary_if) | |
44524fcd | 952 | goto out; |
c6c8fea2 SE |
953 | |
954 | /* get routing information */ | |
fb778ea1 | 955 | rcu_read_lock(); |
7aadf889 | 956 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
c6c8fea2 | 957 | |
44524fcd ML |
958 | if (!orig_node) |
959 | goto unlock; | |
c6c8fea2 | 960 | |
44524fcd ML |
961 | neigh_node = orig_node->router; |
962 | ||
963 | if (!neigh_node) | |
964 | goto unlock; | |
965 | ||
966 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { | |
967 | neigh_node = NULL; | |
968 | goto unlock; | |
969 | } | |
c6c8fea2 | 970 | |
44524fcd | 971 | rcu_read_unlock(); |
c6c8fea2 | 972 | |
44524fcd ML |
973 | /* create a copy of the skb, if needed, to modify it. */ |
974 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
975 | goto out; | |
c6c8fea2 | 976 | |
44524fcd | 977 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 978 | |
44524fcd ML |
979 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
980 | memcpy(icmp_packet->orig, | |
981 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
982 | icmp_packet->msg_type = TTL_EXCEEDED; | |
983 | icmp_packet->ttl = TTL; | |
984 | ||
d0072609 | 985 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
986 | ret = NET_RX_SUCCESS; |
987 | goto out; | |
c6c8fea2 | 988 | |
44524fcd ML |
989 | unlock: |
990 | rcu_read_unlock(); | |
44524fcd ML |
991 | out: |
992 | if (neigh_node) | |
993 | neigh_node_free_ref(neigh_node); | |
994 | if (orig_node) | |
7b36e8ee | 995 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
996 | return ret; |
997 | } | |
998 | ||
999 | ||
e6c10f43 | 1000 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1001 | { |
1002 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1003 | struct icmp_packet_rr *icmp_packet; | |
1004 | struct ethhdr *ethhdr; | |
44524fcd ML |
1005 | struct orig_node *orig_node = NULL; |
1006 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 1007 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 1008 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1009 | |
1010 | /** | |
1011 | * we truncate all incoming icmp packets if they don't match our size | |
1012 | */ | |
1013 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
1014 | hdr_size = sizeof(struct icmp_packet_rr); | |
1015 | ||
1016 | /* drop packet if it has not necessary minimum size */ | |
1017 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 1018 | goto out; |
c6c8fea2 SE |
1019 | |
1020 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1021 | ||
1022 | /* packet with unicast indication but broadcast recipient */ | |
1023 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 1024 | goto out; |
c6c8fea2 SE |
1025 | |
1026 | /* packet with broadcast sender address */ | |
1027 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 1028 | goto out; |
c6c8fea2 SE |
1029 | |
1030 | /* not for me */ | |
1031 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 1032 | goto out; |
c6c8fea2 SE |
1033 | |
1034 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
1035 | ||
1036 | /* add record route information if not full */ | |
1037 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
1038 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
1039 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
1040 | ethhdr->h_dest, ETH_ALEN); | |
1041 | icmp_packet->rr_cur++; | |
1042 | } | |
1043 | ||
1044 | /* packet for me */ | |
1045 | if (is_my_mac(icmp_packet->dst)) | |
1046 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
1047 | ||
1048 | /* TTL exceeded */ | |
1049 | if (icmp_packet->ttl < 2) | |
74ef1153 | 1050 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 1051 | |
c6c8fea2 | 1052 | /* get routing information */ |
fb778ea1 | 1053 | rcu_read_lock(); |
7aadf889 ML |
1054 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
1055 | ||
44524fcd ML |
1056 | if (!orig_node) |
1057 | goto unlock; | |
c6c8fea2 | 1058 | |
44524fcd | 1059 | neigh_node = orig_node->router; |
c6c8fea2 | 1060 | |
44524fcd ML |
1061 | if (!neigh_node) |
1062 | goto unlock; | |
1063 | ||
1064 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { | |
1065 | neigh_node = NULL; | |
1066 | goto unlock; | |
1067 | } | |
c6c8fea2 | 1068 | |
44524fcd | 1069 | rcu_read_unlock(); |
c6c8fea2 | 1070 | |
44524fcd ML |
1071 | /* create a copy of the skb, if needed, to modify it. */ |
1072 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1073 | goto out; | |
c6c8fea2 | 1074 | |
44524fcd | 1075 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 1076 | |
44524fcd ML |
1077 | /* decrement ttl */ |
1078 | icmp_packet->ttl--; | |
1079 | ||
1080 | /* route it */ | |
d0072609 | 1081 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
1082 | ret = NET_RX_SUCCESS; |
1083 | goto out; | |
c6c8fea2 | 1084 | |
44524fcd ML |
1085 | unlock: |
1086 | rcu_read_unlock(); | |
44524fcd ML |
1087 | out: |
1088 | if (neigh_node) | |
1089 | neigh_node_free_ref(neigh_node); | |
1090 | if (orig_node) | |
7b36e8ee | 1091 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1092 | return ret; |
1093 | } | |
1094 | ||
1095 | /* find a suitable router for this originator, and use | |
a4c135c5 SW |
1096 | * bonding if possible. increases the found neighbors |
1097 | * refcount.*/ | |
c6c8fea2 SE |
1098 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
1099 | struct orig_node *orig_node, | |
e6c10f43 | 1100 | struct hard_iface *recv_if) |
c6c8fea2 SE |
1101 | { |
1102 | struct orig_node *primary_orig_node; | |
1103 | struct orig_node *router_orig; | |
a4c135c5 | 1104 | struct neigh_node *router, *first_candidate, *tmp_neigh_node; |
c6c8fea2 SE |
1105 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
1106 | int bonding_enabled; | |
1107 | ||
1108 | if (!orig_node) | |
1109 | return NULL; | |
1110 | ||
1111 | if (!orig_node->router) | |
1112 | return NULL; | |
1113 | ||
1114 | /* without bonding, the first node should | |
1115 | * always choose the default router. */ | |
c6c8fea2 SE |
1116 | bonding_enabled = atomic_read(&bat_priv->bonding); |
1117 | ||
a4c135c5 SW |
1118 | rcu_read_lock(); |
1119 | /* select default router to output */ | |
1120 | router = orig_node->router; | |
c6c8fea2 | 1121 | router_orig = orig_node->router->orig_node; |
44524fcd | 1122 | if (!router_orig || !atomic_inc_not_zero(&router->refcount)) { |
a4c135c5 SW |
1123 | rcu_read_unlock(); |
1124 | return NULL; | |
1125 | } | |
1126 | ||
a4c135c5 SW |
1127 | if ((!recv_if) && (!bonding_enabled)) |
1128 | goto return_router; | |
c6c8fea2 SE |
1129 | |
1130 | /* if we have something in the primary_addr, we can search | |
1131 | * for a potential bonding candidate. */ | |
39901e71 | 1132 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 1133 | goto return_router; |
c6c8fea2 SE |
1134 | |
1135 | /* find the orig_node which has the primary interface. might | |
1136 | * even be the same as our router_orig in many cases */ | |
1137 | ||
39901e71 | 1138 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
1139 | primary_orig_node = router_orig; |
1140 | } else { | |
7aadf889 ML |
1141 | primary_orig_node = orig_hash_find(bat_priv, |
1142 | router_orig->primary_addr); | |
c6c8fea2 | 1143 | if (!primary_orig_node) |
a4c135c5 | 1144 | goto return_router; |
7aadf889 | 1145 | |
7b36e8ee | 1146 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
1147 | } |
1148 | ||
1149 | /* with less than 2 candidates, we can't do any | |
1150 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
1151 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
1152 | goto return_router; | |
c6c8fea2 SE |
1153 | |
1154 | ||
1155 | /* all nodes between should choose a candidate which | |
1156 | * is is not on the interface where the packet came | |
1157 | * in. */ | |
a4c135c5 | 1158 | |
44524fcd | 1159 | neigh_node_free_ref(router); |
a4c135c5 SW |
1160 | first_candidate = NULL; |
1161 | router = NULL; | |
c6c8fea2 SE |
1162 | |
1163 | if (bonding_enabled) { | |
1164 | /* in the bonding case, send the packets in a round | |
1165 | * robin fashion over the remaining interfaces. */ | |
a4c135c5 SW |
1166 | |
1167 | list_for_each_entry_rcu(tmp_neigh_node, | |
1168 | &primary_orig_node->bond_list, bonding_list) { | |
1169 | if (!first_candidate) | |
1170 | first_candidate = tmp_neigh_node; | |
c6c8fea2 | 1171 | /* recv_if == NULL on the first node. */ |
44524fcd ML |
1172 | if (tmp_neigh_node->if_incoming != recv_if && |
1173 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
a4c135c5 | 1174 | router = tmp_neigh_node; |
c6c8fea2 | 1175 | break; |
a4c135c5 SW |
1176 | } |
1177 | } | |
c6c8fea2 | 1178 | |
a4c135c5 | 1179 | /* use the first candidate if nothing was found. */ |
44524fcd ML |
1180 | if (!router && first_candidate && |
1181 | atomic_inc_not_zero(&first_candidate->refcount)) | |
a4c135c5 | 1182 | router = first_candidate; |
c6c8fea2 | 1183 | |
44524fcd ML |
1184 | if (!router) { |
1185 | rcu_read_unlock(); | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
a4c135c5 SW |
1189 | /* selected should point to the next element |
1190 | * after the current router */ | |
1191 | spin_lock_bh(&primary_orig_node->neigh_list_lock); | |
1192 | /* this is a list_move(), which unfortunately | |
1193 | * does not exist as rcu version */ | |
1194 | list_del_rcu(&primary_orig_node->bond_list); | |
1195 | list_add_rcu(&primary_orig_node->bond_list, | |
1196 | &router->bonding_list); | |
1197 | spin_unlock_bh(&primary_orig_node->neigh_list_lock); | |
c6c8fea2 SE |
1198 | |
1199 | } else { | |
1200 | /* if bonding is disabled, use the best of the | |
1201 | * remaining candidates which are not using | |
1202 | * this interface. */ | |
a4c135c5 SW |
1203 | list_for_each_entry_rcu(tmp_neigh_node, |
1204 | &primary_orig_node->bond_list, bonding_list) { | |
1205 | if (!first_candidate) | |
1206 | first_candidate = tmp_neigh_node; | |
c6c8fea2 | 1207 | |
c6c8fea2 | 1208 | /* recv_if == NULL on the first node. */ |
44524fcd ML |
1209 | if (tmp_neigh_node->if_incoming == recv_if) |
1210 | continue; | |
1211 | ||
1212 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1213 | continue; | |
1214 | ||
1215 | /* if we don't have a router yet | |
1216 | * or this one is better, choose it. */ | |
1217 | if ((!router) || | |
1218 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
1219 | /* decrement refcount of | |
1220 | * previously selected router */ | |
1221 | if (router) | |
1222 | neigh_node_free_ref(router); | |
1223 | ||
1224 | router = tmp_neigh_node; | |
1225 | atomic_inc_not_zero(&router->refcount); | |
1226 | } | |
1227 | ||
1228 | neigh_node_free_ref(tmp_neigh_node); | |
a4c135c5 | 1229 | } |
c6c8fea2 | 1230 | |
a4c135c5 | 1231 | /* use the first candidate if nothing was found. */ |
44524fcd ML |
1232 | if (!router && first_candidate && |
1233 | atomic_inc_not_zero(&first_candidate->refcount)) | |
a4c135c5 | 1234 | router = first_candidate; |
c6c8fea2 | 1235 | } |
a4c135c5 | 1236 | return_router: |
a4c135c5 | 1237 | rcu_read_unlock(); |
c6c8fea2 SE |
1238 | return router; |
1239 | } | |
1240 | ||
1241 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
1242 | { | |
1243 | struct ethhdr *ethhdr; | |
1244 | ||
1245 | /* drop packet if it has not necessary minimum size */ | |
1246 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1247 | return -1; | |
1248 | ||
1249 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1250 | ||
1251 | /* packet with unicast indication but broadcast recipient */ | |
1252 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
1253 | return -1; | |
1254 | ||
1255 | /* packet with broadcast sender address */ | |
1256 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1257 | return -1; | |
1258 | ||
1259 | /* not for me */ | |
1260 | if (!is_my_mac(ethhdr->h_dest)) | |
1261 | return -1; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
7cefb149 | 1266 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1267 | { |
1268 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
1269 | struct orig_node *orig_node = NULL; |
1270 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1271 | struct unicast_packet *unicast_packet; |
1272 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 1273 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1274 | struct sk_buff *new_skb; |
1275 | ||
1276 | unicast_packet = (struct unicast_packet *)skb->data; | |
1277 | ||
1278 | /* TTL exceeded */ | |
1279 | if (unicast_packet->ttl < 2) { | |
1280 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
1281 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1282 | unicast_packet->dest); | |
44524fcd | 1283 | goto out; |
c6c8fea2 SE |
1284 | } |
1285 | ||
1286 | /* get routing information */ | |
fb778ea1 | 1287 | rcu_read_lock(); |
7aadf889 ML |
1288 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
1289 | ||
44524fcd ML |
1290 | if (!orig_node) |
1291 | goto unlock; | |
1292 | ||
fb778ea1 | 1293 | rcu_read_unlock(); |
c6c8fea2 | 1294 | |
a4c135c5 | 1295 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 1296 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 1297 | |
d0072609 | 1298 | if (!neigh_node) |
44524fcd | 1299 | goto out; |
c6c8fea2 SE |
1300 | |
1301 | /* create a copy of the skb, if needed, to modify it. */ | |
1302 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 1303 | goto out; |
c6c8fea2 SE |
1304 | |
1305 | unicast_packet = (struct unicast_packet *)skb->data; | |
1306 | ||
1307 | if (unicast_packet->packet_type == BAT_UNICAST && | |
1308 | atomic_read(&bat_priv->fragmentation) && | |
d0072609 ML |
1309 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
1310 | ret = frag_send_skb(skb, bat_priv, | |
1311 | neigh_node->if_incoming, neigh_node->addr); | |
1312 | goto out; | |
1313 | } | |
c6c8fea2 SE |
1314 | |
1315 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
d0072609 | 1316 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
1317 | |
1318 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1319 | ||
1320 | if (ret == NET_RX_DROP) | |
44524fcd | 1321 | goto out; |
c6c8fea2 SE |
1322 | |
1323 | /* packet was buffered for late merge */ | |
44524fcd ML |
1324 | if (!new_skb) { |
1325 | ret = NET_RX_SUCCESS; | |
1326 | goto out; | |
1327 | } | |
c6c8fea2 SE |
1328 | |
1329 | skb = new_skb; | |
1330 | unicast_packet = (struct unicast_packet *)skb->data; | |
1331 | } | |
1332 | ||
1333 | /* decrement ttl */ | |
1334 | unicast_packet->ttl--; | |
1335 | ||
1336 | /* route it */ | |
d0072609 | 1337 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
1338 | ret = NET_RX_SUCCESS; |
1339 | goto out; | |
c6c8fea2 | 1340 | |
44524fcd ML |
1341 | unlock: |
1342 | rcu_read_unlock(); | |
44524fcd ML |
1343 | out: |
1344 | if (neigh_node) | |
1345 | neigh_node_free_ref(neigh_node); | |
1346 | if (orig_node) | |
7b36e8ee | 1347 | orig_node_free_ref(orig_node); |
44524fcd | 1348 | return ret; |
c6c8fea2 SE |
1349 | } |
1350 | ||
e6c10f43 | 1351 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1352 | { |
1353 | struct unicast_packet *unicast_packet; | |
1354 | int hdr_size = sizeof(struct unicast_packet); | |
1355 | ||
1356 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1357 | return NET_RX_DROP; | |
1358 | ||
1359 | unicast_packet = (struct unicast_packet *)skb->data; | |
1360 | ||
1361 | /* packet for me */ | |
1362 | if (is_my_mac(unicast_packet->dest)) { | |
1363 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
1364 | return NET_RX_SUCCESS; | |
1365 | } | |
1366 | ||
7cefb149 | 1367 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1368 | } |
1369 | ||
e6c10f43 | 1370 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1371 | { |
1372 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1373 | struct unicast_frag_packet *unicast_packet; | |
1374 | int hdr_size = sizeof(struct unicast_frag_packet); | |
1375 | struct sk_buff *new_skb = NULL; | |
1376 | int ret; | |
1377 | ||
1378 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1379 | return NET_RX_DROP; | |
1380 | ||
1381 | unicast_packet = (struct unicast_frag_packet *)skb->data; | |
1382 | ||
1383 | /* packet for me */ | |
1384 | if (is_my_mac(unicast_packet->dest)) { | |
1385 | ||
1386 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1387 | ||
1388 | if (ret == NET_RX_DROP) | |
1389 | return NET_RX_DROP; | |
1390 | ||
1391 | /* packet was buffered for late merge */ | |
1392 | if (!new_skb) | |
1393 | return NET_RX_SUCCESS; | |
1394 | ||
1395 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1396 | sizeof(struct unicast_packet)); | |
1397 | return NET_RX_SUCCESS; | |
1398 | } | |
1399 | ||
7cefb149 | 1400 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1401 | } |
1402 | ||
1403 | ||
e6c10f43 | 1404 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1405 | { |
1406 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1407 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1408 | struct bcast_packet *bcast_packet; |
1409 | struct ethhdr *ethhdr; | |
1410 | int hdr_size = sizeof(struct bcast_packet); | |
f3e0008f | 1411 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1412 | int32_t seq_diff; |
1413 | ||
1414 | /* drop packet if it has not necessary minimum size */ | |
1415 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1416 | goto out; |
c6c8fea2 SE |
1417 | |
1418 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1419 | ||
1420 | /* packet with broadcast indication but unicast recipient */ | |
1421 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1422 | goto out; |
c6c8fea2 SE |
1423 | |
1424 | /* packet with broadcast sender address */ | |
1425 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1426 | goto out; |
c6c8fea2 SE |
1427 | |
1428 | /* ignore broadcasts sent by myself */ | |
1429 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1430 | goto out; |
c6c8fea2 SE |
1431 | |
1432 | bcast_packet = (struct bcast_packet *)skb->data; | |
1433 | ||
1434 | /* ignore broadcasts originated by myself */ | |
1435 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1436 | goto out; |
c6c8fea2 SE |
1437 | |
1438 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1439 | goto out; |
c6c8fea2 | 1440 | |
fb778ea1 | 1441 | rcu_read_lock(); |
7aadf889 | 1442 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1443 | |
1444 | if (!orig_node) | |
1445 | goto rcu_unlock; | |
1446 | ||
fb778ea1 | 1447 | rcu_read_unlock(); |
c6c8fea2 | 1448 | |
f3e0008f | 1449 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1450 | |
1451 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1452 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1453 | ntohl(bcast_packet->seqno))) | |
1454 | goto spin_unlock; | |
c6c8fea2 SE |
1455 | |
1456 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1457 | ||
1458 | /* check whether the packet is old and the host just restarted. */ | |
1459 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1460 | &orig_node->bcast_seqno_reset)) |
1461 | goto spin_unlock; | |
c6c8fea2 SE |
1462 | |
1463 | /* mark broadcast in flood history, update window position | |
1464 | * if required. */ | |
1465 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1466 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1467 | ||
f3e0008f | 1468 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1469 | |
c6c8fea2 SE |
1470 | /* rebroadcast packet */ |
1471 | add_bcast_packet_to_list(bat_priv, skb); | |
1472 | ||
1473 | /* broadcast for me */ | |
1474 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1475 | ret = NET_RX_SUCCESS; |
1476 | goto out; | |
c6c8fea2 | 1477 | |
f3e0008f ML |
1478 | rcu_unlock: |
1479 | rcu_read_unlock(); | |
f3e0008f ML |
1480 | goto out; |
1481 | spin_unlock: | |
1482 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1483 | out: |
1484 | if (orig_node) | |
7b36e8ee | 1485 | orig_node_free_ref(orig_node); |
f3e0008f | 1486 | return ret; |
c6c8fea2 SE |
1487 | } |
1488 | ||
e6c10f43 | 1489 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1490 | { |
1491 | struct vis_packet *vis_packet; | |
1492 | struct ethhdr *ethhdr; | |
1493 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1494 | int hdr_size = sizeof(struct vis_packet); | |
1495 | ||
1496 | /* keep skb linear */ | |
1497 | if (skb_linearize(skb) < 0) | |
1498 | return NET_RX_DROP; | |
1499 | ||
1500 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1501 | return NET_RX_DROP; | |
1502 | ||
1503 | vis_packet = (struct vis_packet *)skb->data; | |
1504 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1505 | ||
1506 | /* not for me */ | |
1507 | if (!is_my_mac(ethhdr->h_dest)) | |
1508 | return NET_RX_DROP; | |
1509 | ||
1510 | /* ignore own packets */ | |
1511 | if (is_my_mac(vis_packet->vis_orig)) | |
1512 | return NET_RX_DROP; | |
1513 | ||
1514 | if (is_my_mac(vis_packet->sender_orig)) | |
1515 | return NET_RX_DROP; | |
1516 | ||
1517 | switch (vis_packet->vis_type) { | |
1518 | case VIS_TYPE_SERVER_SYNC: | |
1519 | receive_server_sync_packet(bat_priv, vis_packet, | |
1520 | skb_headlen(skb)); | |
1521 | break; | |
1522 | ||
1523 | case VIS_TYPE_CLIENT_UPDATE: | |
1524 | receive_client_update_packet(bat_priv, vis_packet, | |
1525 | skb_headlen(skb)); | |
1526 | break; | |
1527 | ||
1528 | default: /* ignore unknown packet */ | |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | /* We take a copy of the data in the packet, so we should | |
1533 | always free the skbuf. */ | |
1534 | return NET_RX_DROP; | |
1535 | } |