Commit | Line | Data |
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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 | ||
38 | void slide_own_bcast_window(struct batman_if *batman_if) | |
39 | { | |
40 | struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); | |
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 | ||
49 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
50 | ||
51 | for (i = 0; i < hash->size; i++) { | |
52 | head = &hash->table[i]; | |
53 | ||
fb778ea1 | 54 | rcu_read_lock(); |
7aadf889 | 55 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 56 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 SE |
57 | word_index = batman_if->if_num * NUM_WORDS; |
58 | word = &(orig_node->bcast_own[word_index]); | |
59 | ||
60 | bit_get_packet(bat_priv, word, 1, 0); | |
61 | orig_node->bcast_own_sum[batman_if->if_num] = | |
62 | bit_packet_count(word); | |
2ae2daf6 | 63 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 64 | } |
fb778ea1 | 65 | rcu_read_unlock(); |
c6c8fea2 SE |
66 | } |
67 | ||
68 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
69 | } | |
70 | ||
71 | static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
72 | unsigned char *hna_buff, int hna_buff_len) | |
73 | { | |
74 | if ((hna_buff_len != orig_node->hna_buff_len) || | |
75 | ((hna_buff_len > 0) && | |
76 | (orig_node->hna_buff_len > 0) && | |
77 | (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { | |
78 | ||
79 | if (orig_node->hna_buff_len > 0) | |
80 | hna_global_del_orig(bat_priv, orig_node, | |
81 | "originator changed hna"); | |
82 | ||
83 | if ((hna_buff_len > 0) && (hna_buff)) | |
84 | hna_global_add_orig(bat_priv, orig_node, | |
85 | hna_buff, hna_buff_len); | |
86 | } | |
87 | } | |
88 | ||
89 | static void update_route(struct bat_priv *bat_priv, | |
90 | struct orig_node *orig_node, | |
91 | struct neigh_node *neigh_node, | |
92 | unsigned char *hna_buff, int hna_buff_len) | |
93 | { | |
a8e7f4bc ML |
94 | struct neigh_node *neigh_node_tmp; |
95 | ||
c6c8fea2 SE |
96 | /* route deleted */ |
97 | if ((orig_node->router) && (!neigh_node)) { | |
98 | ||
99 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", | |
100 | orig_node->orig); | |
101 | hna_global_del_orig(bat_priv, orig_node, | |
102 | "originator timed out"); | |
103 | ||
104 | /* route added */ | |
105 | } else if ((!orig_node->router) && (neigh_node)) { | |
106 | ||
107 | bat_dbg(DBG_ROUTES, bat_priv, | |
108 | "Adding route towards: %pM (via %pM)\n", | |
109 | orig_node->orig, neigh_node->addr); | |
110 | hna_global_add_orig(bat_priv, orig_node, | |
111 | hna_buff, hna_buff_len); | |
112 | ||
113 | /* route changed */ | |
114 | } else { | |
115 | bat_dbg(DBG_ROUTES, bat_priv, | |
116 | "Changing route towards: %pM " | |
117 | "(now via %pM - was via %pM)\n", | |
118 | orig_node->orig, neigh_node->addr, | |
119 | orig_node->router->addr); | |
120 | } | |
121 | ||
44524fcd ML |
122 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
123 | neigh_node = NULL; | |
a8e7f4bc | 124 | neigh_node_tmp = orig_node->router; |
c6c8fea2 | 125 | orig_node->router = neigh_node; |
a8e7f4bc | 126 | if (neigh_node_tmp) |
44524fcd | 127 | neigh_node_free_ref(neigh_node_tmp); |
c6c8fea2 SE |
128 | } |
129 | ||
130 | ||
131 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
132 | struct neigh_node *neigh_node, unsigned char *hna_buff, | |
133 | int hna_buff_len) | |
134 | { | |
135 | ||
136 | if (!orig_node) | |
137 | return; | |
138 | ||
139 | if (orig_node->router != neigh_node) | |
140 | update_route(bat_priv, orig_node, neigh_node, | |
141 | hna_buff, hna_buff_len); | |
142 | /* may be just HNA changed */ | |
143 | else | |
144 | update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len); | |
145 | } | |
146 | ||
147 | static int is_bidirectional_neigh(struct orig_node *orig_node, | |
148 | struct orig_node *orig_neigh_node, | |
149 | struct batman_packet *batman_packet, | |
150 | struct batman_if *if_incoming) | |
151 | { | |
152 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1605d0d6 | 153 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; |
9591a79f | 154 | struct hlist_node *node; |
c6c8fea2 | 155 | unsigned char total_count; |
0ede9f41 ML |
156 | uint8_t orig_eq_count, neigh_rq_count, tq_own; |
157 | int tq_asym_penalty, ret = 0; | |
c6c8fea2 SE |
158 | |
159 | if (orig_node == orig_neigh_node) { | |
f987ed6e ML |
160 | rcu_read_lock(); |
161 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
162 | &orig_node->neigh_list, list) { | |
c6c8fea2 | 163 | |
1605d0d6 ML |
164 | if (!compare_eth(tmp_neigh_node->addr, |
165 | orig_neigh_node->orig)) | |
166 | continue; | |
167 | ||
168 | if (tmp_neigh_node->if_incoming != if_incoming) | |
169 | continue; | |
170 | ||
171 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
172 | continue; | |
173 | ||
174 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 175 | } |
1605d0d6 | 176 | rcu_read_unlock(); |
c6c8fea2 SE |
177 | |
178 | if (!neigh_node) | |
179 | neigh_node = create_neighbor(orig_node, | |
180 | orig_neigh_node, | |
181 | orig_neigh_node->orig, | |
182 | if_incoming); | |
c6c8fea2 | 183 | if (!neigh_node) |
1605d0d6 | 184 | goto out; |
c6c8fea2 SE |
185 | |
186 | neigh_node->last_valid = jiffies; | |
187 | } else { | |
188 | /* find packet count of corresponding one hop neighbor */ | |
f987ed6e ML |
189 | rcu_read_lock(); |
190 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
191 | &orig_neigh_node->neigh_list, list) { | |
c6c8fea2 | 192 | |
1605d0d6 ML |
193 | if (!compare_eth(tmp_neigh_node->addr, |
194 | orig_neigh_node->orig)) | |
195 | continue; | |
196 | ||
197 | if (tmp_neigh_node->if_incoming != if_incoming) | |
198 | continue; | |
199 | ||
200 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
201 | continue; | |
202 | ||
203 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 204 | } |
1605d0d6 | 205 | rcu_read_unlock(); |
c6c8fea2 SE |
206 | |
207 | if (!neigh_node) | |
208 | neigh_node = create_neighbor(orig_neigh_node, | |
209 | orig_neigh_node, | |
210 | orig_neigh_node->orig, | |
211 | if_incoming); | |
c6c8fea2 | 212 | if (!neigh_node) |
1605d0d6 | 213 | goto out; |
c6c8fea2 SE |
214 | } |
215 | ||
216 | orig_node->last_valid = jiffies; | |
217 | ||
0ede9f41 ML |
218 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
219 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
220 | neigh_rq_count = neigh_node->real_packet_count; | |
221 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
222 | ||
c6c8fea2 | 223 | /* pay attention to not get a value bigger than 100 % */ |
0ede9f41 ML |
224 | total_count = (orig_eq_count > neigh_rq_count ? |
225 | neigh_rq_count : orig_eq_count); | |
c6c8fea2 SE |
226 | |
227 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
228 | /* if we receive too few packets it is not considered bidirectional */ | |
229 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
0ede9f41 ML |
230 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
231 | tq_own = 0; | |
c6c8fea2 SE |
232 | else |
233 | /* neigh_node->real_packet_count is never zero as we | |
234 | * only purge old information when getting new | |
235 | * information */ | |
0ede9f41 | 236 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
c6c8fea2 SE |
237 | |
238 | /* | |
239 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does | |
240 | * affect the nearly-symmetric links only a little, but | |
241 | * punishes asymmetric links more. This will give a value | |
242 | * between 0 and TQ_MAX_VALUE | |
243 | */ | |
0ede9f41 ML |
244 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
245 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
246 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
247 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
248 | (TQ_LOCAL_WINDOW_SIZE * | |
249 | TQ_LOCAL_WINDOW_SIZE * | |
250 | TQ_LOCAL_WINDOW_SIZE); | |
251 | ||
252 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / | |
253 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
c6c8fea2 SE |
254 | |
255 | bat_dbg(DBG_BATMAN, bat_priv, | |
256 | "bidirectional: " | |
257 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
258 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
259 | "total tq: %3i\n", | |
260 | orig_node->orig, orig_neigh_node->orig, total_count, | |
0ede9f41 | 261 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
c6c8fea2 SE |
262 | |
263 | /* if link has the minimum required transmission quality | |
264 | * consider it bidirectional */ | |
265 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
a775eb84 ML |
266 | ret = 1; |
267 | ||
a775eb84 ML |
268 | out: |
269 | if (neigh_node) | |
44524fcd | 270 | neigh_node_free_ref(neigh_node); |
a775eb84 | 271 | return ret; |
c6c8fea2 SE |
272 | } |
273 | ||
a4c135c5 SW |
274 | /* caller must hold the neigh_list_lock */ |
275 | void bonding_candidate_del(struct orig_node *orig_node, | |
276 | struct neigh_node *neigh_node) | |
277 | { | |
278 | /* this neighbor is not part of our candidate list */ | |
279 | if (list_empty(&neigh_node->bonding_list)) | |
280 | goto out; | |
281 | ||
282 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 283 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 284 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
285 | atomic_dec(&orig_node->bond_candidates); |
286 | ||
287 | out: | |
288 | return; | |
289 | } | |
290 | ||
291 | static void bonding_candidate_add(struct orig_node *orig_node, | |
292 | struct neigh_node *neigh_node) | |
293 | { | |
294 | struct hlist_node *node; | |
295 | struct neigh_node *tmp_neigh_node; | |
296 | uint8_t best_tq, interference_candidate = 0; | |
297 | ||
298 | spin_lock_bh(&orig_node->neigh_list_lock); | |
299 | ||
300 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
301 | if (!compare_eth(orig_node->orig, |
302 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
303 | goto candidate_del; |
304 | ||
305 | if (!orig_node->router) | |
306 | goto candidate_del; | |
307 | ||
308 | best_tq = orig_node->router->tq_avg; | |
309 | ||
310 | /* ... and is good enough to be considered */ | |
311 | if (neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) | |
312 | goto candidate_del; | |
313 | ||
314 | /** | |
315 | * check if we have another candidate with the same mac address or | |
316 | * interface. If we do, we won't select this candidate because of | |
317 | * possible interference. | |
318 | */ | |
319 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
320 | &orig_node->neigh_list, list) { | |
321 | ||
322 | if (tmp_neigh_node == neigh_node) | |
323 | continue; | |
324 | ||
325 | /* we only care if the other candidate is even | |
326 | * considered as candidate. */ | |
327 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
328 | continue; | |
329 | ||
330 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 331 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
332 | interference_candidate = 1; |
333 | break; | |
334 | } | |
335 | } | |
336 | ||
337 | /* don't care further if it is an interference candidate */ | |
338 | if (interference_candidate) | |
339 | goto candidate_del; | |
340 | ||
341 | /* this neighbor already is part of our candidate list */ | |
342 | if (!list_empty(&neigh_node->bonding_list)) | |
343 | goto out; | |
344 | ||
44524fcd ML |
345 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
346 | goto out; | |
347 | ||
a4c135c5 | 348 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
349 | atomic_inc(&orig_node->bond_candidates); |
350 | goto out; | |
351 | ||
352 | candidate_del: | |
353 | bonding_candidate_del(orig_node, neigh_node); | |
354 | ||
355 | out: | |
356 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
357 | return; | |
358 | } | |
359 | ||
360 | /* copy primary address for bonding */ | |
361 | static void bonding_save_primary(struct orig_node *orig_node, | |
362 | struct orig_node *orig_neigh_node, | |
363 | struct batman_packet *batman_packet) | |
364 | { | |
365 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) | |
366 | return; | |
367 | ||
368 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
369 | } | |
370 | ||
c6c8fea2 SE |
371 | static void update_orig(struct bat_priv *bat_priv, |
372 | struct orig_node *orig_node, | |
373 | struct ethhdr *ethhdr, | |
374 | struct batman_packet *batman_packet, | |
375 | struct batman_if *if_incoming, | |
376 | unsigned char *hna_buff, int hna_buff_len, | |
377 | char is_duplicate) | |
378 | { | |
379 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
2ae2daf6 | 380 | struct orig_node *orig_node_tmp; |
9591a79f | 381 | struct hlist_node *node; |
c6c8fea2 | 382 | int tmp_hna_buff_len; |
2ae2daf6 | 383 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
c6c8fea2 SE |
384 | |
385 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " | |
386 | "Searching and updating originator entry of received packet\n"); | |
387 | ||
f987ed6e ML |
388 | rcu_read_lock(); |
389 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
390 | &orig_node->neigh_list, list) { | |
39901e71 | 391 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
44524fcd ML |
392 | (tmp_neigh_node->if_incoming == if_incoming) && |
393 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
394 | if (neigh_node) | |
395 | neigh_node_free_ref(neigh_node); | |
c6c8fea2 SE |
396 | neigh_node = tmp_neigh_node; |
397 | continue; | |
398 | } | |
399 | ||
400 | if (is_duplicate) | |
401 | continue; | |
402 | ||
403 | ring_buffer_set(tmp_neigh_node->tq_recv, | |
404 | &tmp_neigh_node->tq_index, 0); | |
405 | tmp_neigh_node->tq_avg = | |
406 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
407 | } | |
408 | ||
409 | if (!neigh_node) { | |
410 | struct orig_node *orig_tmp; | |
411 | ||
412 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
413 | if (!orig_tmp) | |
a775eb84 | 414 | goto unlock; |
c6c8fea2 SE |
415 | |
416 | neigh_node = create_neighbor(orig_node, orig_tmp, | |
417 | ethhdr->h_source, if_incoming); | |
16b1aba8 | 418 | |
7b36e8ee | 419 | orig_node_free_ref(orig_tmp); |
c6c8fea2 | 420 | if (!neigh_node) |
a775eb84 | 421 | goto unlock; |
c6c8fea2 SE |
422 | } else |
423 | bat_dbg(DBG_BATMAN, bat_priv, | |
424 | "Updating existing last-hop neighbor of originator\n"); | |
425 | ||
a775eb84 ML |
426 | rcu_read_unlock(); |
427 | ||
c6c8fea2 SE |
428 | orig_node->flags = batman_packet->flags; |
429 | neigh_node->last_valid = jiffies; | |
430 | ||
431 | ring_buffer_set(neigh_node->tq_recv, | |
432 | &neigh_node->tq_index, | |
433 | batman_packet->tq); | |
434 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
435 | ||
436 | if (!is_duplicate) { | |
437 | orig_node->last_ttl = batman_packet->ttl; | |
438 | neigh_node->last_ttl = batman_packet->ttl; | |
439 | } | |
440 | ||
a4c135c5 SW |
441 | bonding_candidate_add(orig_node, neigh_node); |
442 | ||
c6c8fea2 SE |
443 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
444 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); | |
445 | ||
446 | /* if this neighbor already is our next hop there is nothing | |
447 | * to change */ | |
448 | if (orig_node->router == neigh_node) | |
449 | goto update_hna; | |
450 | ||
451 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
452 | if ((orig_node->router) && | |
453 | (orig_node->router->tq_avg > neigh_node->tq_avg)) | |
454 | goto update_hna; | |
455 | ||
456 | /* if the TQ is the same and the link not more symetric we | |
457 | * won't consider it either */ | |
458 | if ((orig_node->router) && | |
2ae2daf6 ML |
459 | (neigh_node->tq_avg == orig_node->router->tq_avg)) { |
460 | orig_node_tmp = orig_node->router->orig_node; | |
461 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
462 | bcast_own_sum_orig = | |
463 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
464 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
465 | ||
466 | orig_node_tmp = neigh_node->orig_node; | |
467 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
468 | bcast_own_sum_neigh = | |
469 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
470 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
471 | ||
472 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
473 | goto update_hna; | |
474 | } | |
c6c8fea2 SE |
475 | |
476 | update_routes(bat_priv, orig_node, neigh_node, | |
477 | hna_buff, tmp_hna_buff_len); | |
478 | goto update_gw; | |
479 | ||
480 | update_hna: | |
481 | update_routes(bat_priv, orig_node, orig_node->router, | |
482 | hna_buff, tmp_hna_buff_len); | |
483 | ||
484 | update_gw: | |
485 | if (orig_node->gw_flags != batman_packet->gw_flags) | |
486 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); | |
487 | ||
488 | orig_node->gw_flags = batman_packet->gw_flags; | |
489 | ||
490 | /* restart gateway selection if fast or late switching was enabled */ | |
491 | if ((orig_node->gw_flags) && | |
492 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
493 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
494 | gw_check_election(bat_priv, orig_node); | |
a775eb84 ML |
495 | |
496 | goto out; | |
497 | ||
498 | unlock: | |
499 | rcu_read_unlock(); | |
500 | out: | |
501 | if (neigh_node) | |
44524fcd | 502 | neigh_node_free_ref(neigh_node); |
c6c8fea2 SE |
503 | } |
504 | ||
505 | /* checks whether the host restarted and is in the protection time. | |
506 | * returns: | |
507 | * 0 if the packet is to be accepted | |
508 | * 1 if the packet is to be ignored. | |
509 | */ | |
510 | static int window_protected(struct bat_priv *bat_priv, | |
511 | int32_t seq_num_diff, | |
512 | unsigned long *last_reset) | |
513 | { | |
514 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) | |
515 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
516 | if (time_after(jiffies, *last_reset + | |
517 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
518 | ||
519 | *last_reset = jiffies; | |
520 | bat_dbg(DBG_BATMAN, bat_priv, | |
521 | "old packet received, start protection\n"); | |
522 | ||
523 | return 0; | |
524 | } else | |
525 | return 1; | |
526 | } | |
527 | return 0; | |
528 | } | |
529 | ||
530 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
531 | * finds out whether it is a duplicate. | |
532 | * returns: | |
533 | * 1 the packet is a duplicate | |
534 | * 0 the packet has not yet been received | |
535 | * -1 the packet is old and has been received while the seqno window | |
536 | * was protected. Caller should drop it. | |
537 | */ | |
538 | static char count_real_packets(struct ethhdr *ethhdr, | |
539 | struct batman_packet *batman_packet, | |
540 | struct batman_if *if_incoming) | |
541 | { | |
542 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
543 | struct orig_node *orig_node; | |
544 | struct neigh_node *tmp_neigh_node; | |
9591a79f | 545 | struct hlist_node *node; |
c6c8fea2 SE |
546 | char is_duplicate = 0; |
547 | int32_t seq_diff; | |
548 | int need_update = 0; | |
0ede9f41 | 549 | int set_mark, ret = -1; |
c6c8fea2 SE |
550 | |
551 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
552 | if (!orig_node) | |
553 | return 0; | |
554 | ||
0ede9f41 | 555 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 SE |
556 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
557 | ||
558 | /* signalize caller that the packet is to be dropped. */ | |
559 | if (window_protected(bat_priv, seq_diff, | |
560 | &orig_node->batman_seqno_reset)) | |
0ede9f41 | 561 | goto out; |
c6c8fea2 | 562 | |
f987ed6e ML |
563 | rcu_read_lock(); |
564 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
565 | &orig_node->neigh_list, list) { | |
c6c8fea2 SE |
566 | |
567 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, | |
568 | orig_node->last_real_seqno, | |
569 | batman_packet->seqno); | |
570 | ||
39901e71 | 571 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
c6c8fea2 SE |
572 | (tmp_neigh_node->if_incoming == if_incoming)) |
573 | set_mark = 1; | |
574 | else | |
575 | set_mark = 0; | |
576 | ||
577 | /* if the window moved, set the update flag. */ | |
578 | need_update |= bit_get_packet(bat_priv, | |
579 | tmp_neigh_node->real_bits, | |
580 | seq_diff, set_mark); | |
581 | ||
582 | tmp_neigh_node->real_packet_count = | |
583 | bit_packet_count(tmp_neigh_node->real_bits); | |
584 | } | |
f987ed6e | 585 | rcu_read_unlock(); |
c6c8fea2 SE |
586 | |
587 | if (need_update) { | |
588 | bat_dbg(DBG_BATMAN, bat_priv, | |
589 | "updating last_seqno: old %d, new %d\n", | |
590 | orig_node->last_real_seqno, batman_packet->seqno); | |
591 | orig_node->last_real_seqno = batman_packet->seqno; | |
592 | } | |
593 | ||
0ede9f41 | 594 | ret = is_duplicate; |
16b1aba8 | 595 | |
0ede9f41 ML |
596 | out: |
597 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7b36e8ee | 598 | orig_node_free_ref(orig_node); |
0ede9f41 | 599 | return ret; |
c6c8fea2 SE |
600 | } |
601 | ||
c6c8fea2 | 602 | void receive_bat_packet(struct ethhdr *ethhdr, |
a4c135c5 SW |
603 | struct batman_packet *batman_packet, |
604 | unsigned char *hna_buff, int hna_buff_len, | |
605 | struct batman_if *if_incoming) | |
c6c8fea2 SE |
606 | { |
607 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
608 | struct batman_if *batman_if; | |
609 | struct orig_node *orig_neigh_node, *orig_node; | |
610 | char has_directlink_flag; | |
611 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
612 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
613 | char is_duplicate; | |
614 | uint32_t if_incoming_seqno; | |
615 | ||
616 | /* Silently drop when the batman packet is actually not a | |
617 | * correct packet. | |
618 | * | |
619 | * This might happen if a packet is padded (e.g. Ethernet has a | |
620 | * minimum frame length of 64 byte) and the aggregation interprets | |
621 | * it as an additional length. | |
622 | * | |
623 | * TODO: A more sane solution would be to have a bit in the | |
624 | * batman_packet to detect whether the packet is the last | |
625 | * packet in an aggregation. Here we expect that the padding | |
626 | * is always zero (or not 0x01) | |
627 | */ | |
628 | if (batman_packet->packet_type != BAT_PACKET) | |
629 | return; | |
630 | ||
631 | /* could be changed by schedule_own_packet() */ | |
632 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
633 | ||
634 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); | |
635 | ||
39901e71 ML |
636 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
637 | batman_packet->orig) ? 1 : 0); | |
c6c8fea2 SE |
638 | |
639 | bat_dbg(DBG_BATMAN, bat_priv, | |
640 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " | |
641 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " | |
642 | "TTL %d, V %d, IDF %d)\n", | |
643 | ethhdr->h_source, if_incoming->net_dev->name, | |
644 | if_incoming->net_dev->dev_addr, batman_packet->orig, | |
645 | batman_packet->prev_sender, batman_packet->seqno, | |
646 | batman_packet->tq, batman_packet->ttl, batman_packet->version, | |
647 | has_directlink_flag); | |
648 | ||
649 | rcu_read_lock(); | |
650 | list_for_each_entry_rcu(batman_if, &if_list, list) { | |
651 | if (batman_if->if_status != IF_ACTIVE) | |
652 | continue; | |
653 | ||
654 | if (batman_if->soft_iface != if_incoming->soft_iface) | |
655 | continue; | |
656 | ||
39901e71 ML |
657 | if (compare_eth(ethhdr->h_source, |
658 | batman_if->net_dev->dev_addr)) | |
c6c8fea2 SE |
659 | is_my_addr = 1; |
660 | ||
39901e71 ML |
661 | if (compare_eth(batman_packet->orig, |
662 | batman_if->net_dev->dev_addr)) | |
c6c8fea2 SE |
663 | is_my_orig = 1; |
664 | ||
39901e71 ML |
665 | if (compare_eth(batman_packet->prev_sender, |
666 | batman_if->net_dev->dev_addr)) | |
c6c8fea2 SE |
667 | is_my_oldorig = 1; |
668 | ||
39901e71 | 669 | if (compare_eth(ethhdr->h_source, broadcast_addr)) |
c6c8fea2 SE |
670 | is_broadcast = 1; |
671 | } | |
672 | rcu_read_unlock(); | |
673 | ||
674 | if (batman_packet->version != COMPAT_VERSION) { | |
675 | bat_dbg(DBG_BATMAN, bat_priv, | |
676 | "Drop packet: incompatible batman version (%i)\n", | |
677 | batman_packet->version); | |
678 | return; | |
679 | } | |
680 | ||
681 | if (is_my_addr) { | |
682 | bat_dbg(DBG_BATMAN, bat_priv, | |
683 | "Drop packet: received my own broadcast (sender: %pM" | |
684 | ")\n", | |
685 | ethhdr->h_source); | |
686 | return; | |
687 | } | |
688 | ||
689 | if (is_broadcast) { | |
690 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
691 | "ignoring all packets with broadcast source addr (sender: %pM" | |
692 | ")\n", ethhdr->h_source); | |
693 | return; | |
694 | } | |
695 | ||
696 | if (is_my_orig) { | |
697 | unsigned long *word; | |
698 | int offset; | |
699 | ||
700 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
c6c8fea2 SE |
701 | if (!orig_neigh_node) |
702 | return; | |
703 | ||
704 | /* neighbor has to indicate direct link and it has to | |
705 | * come via the corresponding interface */ | |
706 | /* if received seqno equals last send seqno save new | |
707 | * seqno for bidirectional check */ | |
708 | if (has_directlink_flag && | |
39901e71 ML |
709 | compare_eth(if_incoming->net_dev->dev_addr, |
710 | batman_packet->orig) && | |
c6c8fea2 SE |
711 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
712 | offset = if_incoming->if_num * NUM_WORDS; | |
2ae2daf6 ML |
713 | |
714 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
c6c8fea2 SE |
715 | word = &(orig_neigh_node->bcast_own[offset]); |
716 | bit_mark(word, 0); | |
717 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
718 | bit_packet_count(word); | |
2ae2daf6 | 719 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
c6c8fea2 SE |
720 | } |
721 | ||
722 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
723 | "originator packet from myself (via neighbor)\n"); | |
7b36e8ee | 724 | orig_node_free_ref(orig_neigh_node); |
c6c8fea2 SE |
725 | return; |
726 | } | |
727 | ||
728 | if (is_my_oldorig) { | |
729 | bat_dbg(DBG_BATMAN, bat_priv, | |
730 | "Drop packet: ignoring all rebroadcast echos (sender: " | |
731 | "%pM)\n", ethhdr->h_source); | |
732 | return; | |
733 | } | |
734 | ||
735 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
736 | if (!orig_node) | |
737 | return; | |
738 | ||
739 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
740 | ||
741 | if (is_duplicate == -1) { | |
742 | bat_dbg(DBG_BATMAN, bat_priv, | |
743 | "Drop packet: packet within seqno protection time " | |
744 | "(sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 745 | goto out; |
c6c8fea2 SE |
746 | } |
747 | ||
748 | if (batman_packet->tq == 0) { | |
749 | bat_dbg(DBG_BATMAN, bat_priv, | |
750 | "Drop packet: originator packet with tq equal 0\n"); | |
16b1aba8 | 751 | goto out; |
c6c8fea2 SE |
752 | } |
753 | ||
754 | /* avoid temporary routing loops */ | |
755 | if ((orig_node->router) && | |
756 | (orig_node->router->orig_node->router) && | |
39901e71 ML |
757 | (compare_eth(orig_node->router->addr, |
758 | batman_packet->prev_sender)) && | |
759 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && | |
760 | (compare_eth(orig_node->router->addr, | |
761 | orig_node->router->orig_node->router->addr))) { | |
c6c8fea2 SE |
762 | bat_dbg(DBG_BATMAN, bat_priv, |
763 | "Drop packet: ignoring all rebroadcast packets that " | |
764 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 765 | goto out; |
c6c8fea2 SE |
766 | } |
767 | ||
768 | /* if sender is a direct neighbor the sender mac equals | |
769 | * originator mac */ | |
770 | orig_neigh_node = (is_single_hop_neigh ? | |
771 | orig_node : | |
772 | get_orig_node(bat_priv, ethhdr->h_source)); | |
773 | if (!orig_neigh_node) | |
16b1aba8 | 774 | goto out_neigh; |
c6c8fea2 SE |
775 | |
776 | /* drop packet if sender is not a direct neighbor and if we | |
777 | * don't route towards it */ | |
778 | if (!is_single_hop_neigh && (!orig_neigh_node->router)) { | |
779 | bat_dbg(DBG_BATMAN, bat_priv, | |
780 | "Drop packet: OGM via unknown neighbor!\n"); | |
16b1aba8 | 781 | goto out_neigh; |
c6c8fea2 SE |
782 | } |
783 | ||
784 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, | |
785 | batman_packet, if_incoming); | |
786 | ||
a4c135c5 SW |
787 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
788 | ||
c6c8fea2 SE |
789 | /* update ranking if it is not a duplicate or has the same |
790 | * seqno and similar ttl as the non-duplicate */ | |
791 | if (is_bidirectional && | |
792 | (!is_duplicate || | |
793 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
794 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
795 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, | |
796 | if_incoming, hna_buff, hna_buff_len, is_duplicate); | |
797 | ||
c6c8fea2 SE |
798 | /* is single hop (direct) neighbor */ |
799 | if (is_single_hop_neigh) { | |
800 | ||
801 | /* mark direct link on incoming interface */ | |
802 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
803 | 1, hna_buff_len, if_incoming); | |
804 | ||
805 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " | |
806 | "rebroadcast neighbor packet with direct link flag\n"); | |
16b1aba8 | 807 | goto out_neigh; |
c6c8fea2 SE |
808 | } |
809 | ||
810 | /* multihop originator */ | |
811 | if (!is_bidirectional) { | |
812 | bat_dbg(DBG_BATMAN, bat_priv, | |
813 | "Drop packet: not received via bidirectional link\n"); | |
16b1aba8 | 814 | goto out_neigh; |
c6c8fea2 SE |
815 | } |
816 | ||
817 | if (is_duplicate) { | |
818 | bat_dbg(DBG_BATMAN, bat_priv, | |
819 | "Drop packet: duplicate packet received\n"); | |
16b1aba8 | 820 | goto out_neigh; |
c6c8fea2 SE |
821 | } |
822 | ||
823 | bat_dbg(DBG_BATMAN, bat_priv, | |
824 | "Forwarding packet: rebroadcast originator packet\n"); | |
825 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
826 | 0, hna_buff_len, if_incoming); | |
16b1aba8 ML |
827 | |
828 | out_neigh: | |
7b36e8ee ML |
829 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
830 | orig_node_free_ref(orig_neigh_node); | |
16b1aba8 | 831 | out: |
7b36e8ee | 832 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
833 | } |
834 | ||
835 | int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) | |
836 | { | |
837 | struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); | |
838 | struct ethhdr *ethhdr; | |
839 | ||
840 | /* drop packet if it has not necessary minimum size */ | |
841 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) | |
842 | return NET_RX_DROP; | |
843 | ||
844 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
845 | ||
846 | /* packet with broadcast indication but unicast recipient */ | |
847 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
848 | return NET_RX_DROP; | |
849 | ||
850 | /* packet with broadcast sender address */ | |
851 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
852 | return NET_RX_DROP; | |
853 | ||
854 | /* create a copy of the skb, if needed, to modify it. */ | |
855 | if (skb_cow(skb, 0) < 0) | |
856 | return NET_RX_DROP; | |
857 | ||
858 | /* keep skb linear */ | |
859 | if (skb_linearize(skb) < 0) | |
860 | return NET_RX_DROP; | |
861 | ||
862 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
863 | ||
864 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
865 | receive_aggr_bat_packet(ethhdr, | |
866 | skb->data, | |
867 | skb_headlen(skb), | |
868 | batman_if); | |
869 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
870 | ||
871 | kfree_skb(skb); | |
872 | return NET_RX_SUCCESS; | |
873 | } | |
874 | ||
875 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
876 | struct sk_buff *skb, size_t icmp_len) | |
877 | { | |
44524fcd ML |
878 | struct orig_node *orig_node = NULL; |
879 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 880 | struct icmp_packet_rr *icmp_packet; |
c6c8fea2 | 881 | struct batman_if *batman_if; |
c6c8fea2 | 882 | uint8_t dstaddr[ETH_ALEN]; |
44524fcd | 883 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
884 | |
885 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
886 | |
887 | /* add data to device queue */ | |
888 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
889 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 890 | goto out; |
c6c8fea2 SE |
891 | } |
892 | ||
893 | if (!bat_priv->primary_if) | |
44524fcd | 894 | goto out; |
c6c8fea2 SE |
895 | |
896 | /* answer echo request (ping) */ | |
897 | /* get routing information */ | |
898 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
fb778ea1 | 899 | rcu_read_lock(); |
7aadf889 | 900 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
c6c8fea2 | 901 | |
44524fcd ML |
902 | if (!orig_node) |
903 | goto unlock; | |
c6c8fea2 | 904 | |
44524fcd | 905 | neigh_node = orig_node->router; |
c6c8fea2 | 906 | |
44524fcd ML |
907 | if (!neigh_node) |
908 | goto unlock; | |
c6c8fea2 | 909 | |
44524fcd ML |
910 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { |
911 | neigh_node = NULL; | |
912 | goto unlock; | |
913 | } | |
c6c8fea2 | 914 | |
44524fcd | 915 | rcu_read_unlock(); |
c6c8fea2 | 916 | |
44524fcd ML |
917 | /* don't lock while sending the packets ... we therefore |
918 | * copy the required data before sending */ | |
919 | batman_if = orig_node->router->if_incoming; | |
920 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
921 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
c6c8fea2 | 922 | |
44524fcd ML |
923 | /* create a copy of the skb, if needed, to modify it. */ |
924 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
925 | goto out; | |
926 | ||
927 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
928 | ||
929 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
930 | memcpy(icmp_packet->orig, | |
931 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
932 | icmp_packet->msg_type = ECHO_REPLY; | |
933 | icmp_packet->ttl = TTL; | |
934 | ||
935 | send_skb_packet(skb, batman_if, dstaddr); | |
936 | ret = NET_RX_SUCCESS; | |
937 | goto out; | |
c6c8fea2 | 938 | |
44524fcd ML |
939 | unlock: |
940 | rcu_read_unlock(); | |
941 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
942 | out: | |
943 | if (neigh_node) | |
944 | neigh_node_free_ref(neigh_node); | |
945 | if (orig_node) | |
7b36e8ee | 946 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
947 | return ret; |
948 | } | |
949 | ||
950 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 951 | struct sk_buff *skb) |
c6c8fea2 | 952 | { |
44524fcd ML |
953 | struct orig_node *orig_node = NULL; |
954 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 | 955 | struct icmp_packet *icmp_packet; |
c6c8fea2 | 956 | struct batman_if *batman_if; |
c6c8fea2 | 957 | uint8_t dstaddr[ETH_ALEN]; |
44524fcd | 958 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
959 | |
960 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
961 | |
962 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
963 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
964 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
965 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
966 | icmp_packet->dst); | |
44524fcd | 967 | goto out; |
c6c8fea2 SE |
968 | } |
969 | ||
970 | if (!bat_priv->primary_if) | |
44524fcd | 971 | goto out; |
c6c8fea2 SE |
972 | |
973 | /* get routing information */ | |
974 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
fb778ea1 | 975 | rcu_read_lock(); |
7aadf889 | 976 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
c6c8fea2 | 977 | |
44524fcd ML |
978 | if (!orig_node) |
979 | goto unlock; | |
c6c8fea2 | 980 | |
44524fcd ML |
981 | neigh_node = orig_node->router; |
982 | ||
983 | if (!neigh_node) | |
984 | goto unlock; | |
985 | ||
986 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { | |
987 | neigh_node = NULL; | |
988 | goto unlock; | |
989 | } | |
c6c8fea2 | 990 | |
44524fcd | 991 | rcu_read_unlock(); |
c6c8fea2 | 992 | |
44524fcd ML |
993 | /* don't lock while sending the packets ... we therefore |
994 | * copy the required data before sending */ | |
995 | batman_if = orig_node->router->if_incoming; | |
996 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
997 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
c6c8fea2 | 998 | |
44524fcd ML |
999 | /* create a copy of the skb, if needed, to modify it. */ |
1000 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1001 | goto out; | |
c6c8fea2 | 1002 | |
44524fcd | 1003 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 1004 | |
44524fcd ML |
1005 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
1006 | memcpy(icmp_packet->orig, | |
1007 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
1008 | icmp_packet->msg_type = TTL_EXCEEDED; | |
1009 | icmp_packet->ttl = TTL; | |
1010 | ||
1011 | send_skb_packet(skb, batman_if, dstaddr); | |
1012 | ret = NET_RX_SUCCESS; | |
1013 | goto out; | |
c6c8fea2 | 1014 | |
44524fcd ML |
1015 | unlock: |
1016 | rcu_read_unlock(); | |
1017 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
1018 | out: | |
1019 | if (neigh_node) | |
1020 | neigh_node_free_ref(neigh_node); | |
1021 | if (orig_node) | |
7b36e8ee | 1022 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1023 | return ret; |
1024 | } | |
1025 | ||
1026 | ||
1027 | int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) | |
1028 | { | |
1029 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1030 | struct icmp_packet_rr *icmp_packet; | |
1031 | struct ethhdr *ethhdr; | |
44524fcd ML |
1032 | struct orig_node *orig_node = NULL; |
1033 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1034 | struct batman_if *batman_if; |
1035 | int hdr_size = sizeof(struct icmp_packet); | |
c6c8fea2 | 1036 | uint8_t dstaddr[ETH_ALEN]; |
44524fcd | 1037 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1038 | |
1039 | /** | |
1040 | * we truncate all incoming icmp packets if they don't match our size | |
1041 | */ | |
1042 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
1043 | hdr_size = sizeof(struct icmp_packet_rr); | |
1044 | ||
1045 | /* drop packet if it has not necessary minimum size */ | |
1046 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 1047 | goto out; |
c6c8fea2 SE |
1048 | |
1049 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1050 | ||
1051 | /* packet with unicast indication but broadcast recipient */ | |
1052 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 1053 | goto out; |
c6c8fea2 SE |
1054 | |
1055 | /* packet with broadcast sender address */ | |
1056 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 1057 | goto out; |
c6c8fea2 SE |
1058 | |
1059 | /* not for me */ | |
1060 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 1061 | goto out; |
c6c8fea2 SE |
1062 | |
1063 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
1064 | ||
1065 | /* add record route information if not full */ | |
1066 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
1067 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
1068 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
1069 | ethhdr->h_dest, ETH_ALEN); | |
1070 | icmp_packet->rr_cur++; | |
1071 | } | |
1072 | ||
1073 | /* packet for me */ | |
1074 | if (is_my_mac(icmp_packet->dst)) | |
1075 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
1076 | ||
1077 | /* TTL exceeded */ | |
1078 | if (icmp_packet->ttl < 2) | |
74ef1153 | 1079 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 1080 | |
c6c8fea2 SE |
1081 | /* get routing information */ |
1082 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
fb778ea1 | 1083 | rcu_read_lock(); |
7aadf889 ML |
1084 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
1085 | ||
44524fcd ML |
1086 | if (!orig_node) |
1087 | goto unlock; | |
c6c8fea2 | 1088 | |
44524fcd | 1089 | neigh_node = orig_node->router; |
c6c8fea2 | 1090 | |
44524fcd ML |
1091 | if (!neigh_node) |
1092 | goto unlock; | |
1093 | ||
1094 | if (!atomic_inc_not_zero(&neigh_node->refcount)) { | |
1095 | neigh_node = NULL; | |
1096 | goto unlock; | |
1097 | } | |
c6c8fea2 | 1098 | |
44524fcd | 1099 | rcu_read_unlock(); |
c6c8fea2 | 1100 | |
44524fcd ML |
1101 | /* don't lock while sending the packets ... we therefore |
1102 | * copy the required data before sending */ | |
1103 | batman_if = orig_node->router->if_incoming; | |
1104 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
1105 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
c6c8fea2 | 1106 | |
44524fcd ML |
1107 | /* create a copy of the skb, if needed, to modify it. */ |
1108 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1109 | goto out; | |
c6c8fea2 | 1110 | |
44524fcd | 1111 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 1112 | |
44524fcd ML |
1113 | /* decrement ttl */ |
1114 | icmp_packet->ttl--; | |
1115 | ||
1116 | /* route it */ | |
1117 | send_skb_packet(skb, batman_if, dstaddr); | |
1118 | ret = NET_RX_SUCCESS; | |
1119 | goto out; | |
c6c8fea2 | 1120 | |
44524fcd ML |
1121 | unlock: |
1122 | rcu_read_unlock(); | |
1123 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
1124 | out: | |
1125 | if (neigh_node) | |
1126 | neigh_node_free_ref(neigh_node); | |
1127 | if (orig_node) | |
7b36e8ee | 1128 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1129 | return ret; |
1130 | } | |
1131 | ||
1132 | /* find a suitable router for this originator, and use | |
a4c135c5 SW |
1133 | * bonding if possible. increases the found neighbors |
1134 | * refcount.*/ | |
c6c8fea2 SE |
1135 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
1136 | struct orig_node *orig_node, | |
1137 | struct batman_if *recv_if) | |
1138 | { | |
1139 | struct orig_node *primary_orig_node; | |
1140 | struct orig_node *router_orig; | |
a4c135c5 | 1141 | struct neigh_node *router, *first_candidate, *tmp_neigh_node; |
c6c8fea2 SE |
1142 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
1143 | int bonding_enabled; | |
1144 | ||
1145 | if (!orig_node) | |
1146 | return NULL; | |
1147 | ||
1148 | if (!orig_node->router) | |
1149 | return NULL; | |
1150 | ||
1151 | /* without bonding, the first node should | |
1152 | * always choose the default router. */ | |
c6c8fea2 SE |
1153 | bonding_enabled = atomic_read(&bat_priv->bonding); |
1154 | ||
a4c135c5 SW |
1155 | rcu_read_lock(); |
1156 | /* select default router to output */ | |
1157 | router = orig_node->router; | |
c6c8fea2 | 1158 | router_orig = orig_node->router->orig_node; |
44524fcd | 1159 | if (!router_orig || !atomic_inc_not_zero(&router->refcount)) { |
a4c135c5 SW |
1160 | rcu_read_unlock(); |
1161 | return NULL; | |
1162 | } | |
1163 | ||
a4c135c5 SW |
1164 | if ((!recv_if) && (!bonding_enabled)) |
1165 | goto return_router; | |
c6c8fea2 SE |
1166 | |
1167 | /* if we have something in the primary_addr, we can search | |
1168 | * for a potential bonding candidate. */ | |
39901e71 | 1169 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 1170 | goto return_router; |
c6c8fea2 SE |
1171 | |
1172 | /* find the orig_node which has the primary interface. might | |
1173 | * even be the same as our router_orig in many cases */ | |
1174 | ||
39901e71 | 1175 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
1176 | primary_orig_node = router_orig; |
1177 | } else { | |
7aadf889 ML |
1178 | primary_orig_node = orig_hash_find(bat_priv, |
1179 | router_orig->primary_addr); | |
c6c8fea2 | 1180 | if (!primary_orig_node) |
a4c135c5 | 1181 | goto return_router; |
7aadf889 | 1182 | |
7b36e8ee | 1183 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
1184 | } |
1185 | ||
1186 | /* with less than 2 candidates, we can't do any | |
1187 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
1188 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
1189 | goto return_router; | |
c6c8fea2 SE |
1190 | |
1191 | ||
1192 | /* all nodes between should choose a candidate which | |
1193 | * is is not on the interface where the packet came | |
1194 | * in. */ | |
a4c135c5 | 1195 | |
44524fcd | 1196 | neigh_node_free_ref(router); |
a4c135c5 SW |
1197 | first_candidate = NULL; |
1198 | router = NULL; | |
c6c8fea2 SE |
1199 | |
1200 | if (bonding_enabled) { | |
1201 | /* in the bonding case, send the packets in a round | |
1202 | * robin fashion over the remaining interfaces. */ | |
a4c135c5 SW |
1203 | |
1204 | list_for_each_entry_rcu(tmp_neigh_node, | |
1205 | &primary_orig_node->bond_list, bonding_list) { | |
1206 | if (!first_candidate) | |
1207 | first_candidate = tmp_neigh_node; | |
c6c8fea2 | 1208 | /* recv_if == NULL on the first node. */ |
44524fcd ML |
1209 | if (tmp_neigh_node->if_incoming != recv_if && |
1210 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
a4c135c5 | 1211 | router = tmp_neigh_node; |
c6c8fea2 | 1212 | break; |
a4c135c5 SW |
1213 | } |
1214 | } | |
c6c8fea2 | 1215 | |
a4c135c5 | 1216 | /* use the first candidate if nothing was found. */ |
44524fcd ML |
1217 | if (!router && first_candidate && |
1218 | atomic_inc_not_zero(&first_candidate->refcount)) | |
a4c135c5 | 1219 | router = first_candidate; |
c6c8fea2 | 1220 | |
44524fcd ML |
1221 | if (!router) { |
1222 | rcu_read_unlock(); | |
1223 | return NULL; | |
1224 | } | |
1225 | ||
a4c135c5 SW |
1226 | /* selected should point to the next element |
1227 | * after the current router */ | |
1228 | spin_lock_bh(&primary_orig_node->neigh_list_lock); | |
1229 | /* this is a list_move(), which unfortunately | |
1230 | * does not exist as rcu version */ | |
1231 | list_del_rcu(&primary_orig_node->bond_list); | |
1232 | list_add_rcu(&primary_orig_node->bond_list, | |
1233 | &router->bonding_list); | |
1234 | spin_unlock_bh(&primary_orig_node->neigh_list_lock); | |
c6c8fea2 SE |
1235 | |
1236 | } else { | |
1237 | /* if bonding is disabled, use the best of the | |
1238 | * remaining candidates which are not using | |
1239 | * this interface. */ | |
a4c135c5 SW |
1240 | list_for_each_entry_rcu(tmp_neigh_node, |
1241 | &primary_orig_node->bond_list, bonding_list) { | |
1242 | if (!first_candidate) | |
1243 | first_candidate = tmp_neigh_node; | |
c6c8fea2 | 1244 | |
c6c8fea2 | 1245 | /* recv_if == NULL on the first node. */ |
44524fcd ML |
1246 | if (tmp_neigh_node->if_incoming == recv_if) |
1247 | continue; | |
1248 | ||
1249 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1250 | continue; | |
1251 | ||
1252 | /* if we don't have a router yet | |
1253 | * or this one is better, choose it. */ | |
1254 | if ((!router) || | |
1255 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
1256 | /* decrement refcount of | |
1257 | * previously selected router */ | |
1258 | if (router) | |
1259 | neigh_node_free_ref(router); | |
1260 | ||
1261 | router = tmp_neigh_node; | |
1262 | atomic_inc_not_zero(&router->refcount); | |
1263 | } | |
1264 | ||
1265 | neigh_node_free_ref(tmp_neigh_node); | |
a4c135c5 | 1266 | } |
c6c8fea2 | 1267 | |
a4c135c5 | 1268 | /* use the first candidate if nothing was found. */ |
44524fcd ML |
1269 | if (!router && first_candidate && |
1270 | atomic_inc_not_zero(&first_candidate->refcount)) | |
a4c135c5 | 1271 | router = first_candidate; |
c6c8fea2 | 1272 | } |
a4c135c5 | 1273 | return_router: |
a4c135c5 | 1274 | rcu_read_unlock(); |
c6c8fea2 SE |
1275 | return router; |
1276 | } | |
1277 | ||
1278 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
1279 | { | |
1280 | struct ethhdr *ethhdr; | |
1281 | ||
1282 | /* drop packet if it has not necessary minimum size */ | |
1283 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1284 | return -1; | |
1285 | ||
1286 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1287 | ||
1288 | /* packet with unicast indication but broadcast recipient */ | |
1289 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
1290 | return -1; | |
1291 | ||
1292 | /* packet with broadcast sender address */ | |
1293 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1294 | return -1; | |
1295 | ||
1296 | /* not for me */ | |
1297 | if (!is_my_mac(ethhdr->h_dest)) | |
1298 | return -1; | |
1299 | ||
1300 | return 0; | |
1301 | } | |
1302 | ||
1303 | int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, | |
1304 | int hdr_size) | |
1305 | { | |
1306 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
1307 | struct orig_node *orig_node = NULL; |
1308 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1309 | struct batman_if *batman_if; |
1310 | uint8_t dstaddr[ETH_ALEN]; | |
1311 | struct unicast_packet *unicast_packet; | |
1312 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 1313 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1314 | struct sk_buff *new_skb; |
1315 | ||
1316 | unicast_packet = (struct unicast_packet *)skb->data; | |
1317 | ||
1318 | /* TTL exceeded */ | |
1319 | if (unicast_packet->ttl < 2) { | |
1320 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
1321 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1322 | unicast_packet->dest); | |
44524fcd | 1323 | goto out; |
c6c8fea2 SE |
1324 | } |
1325 | ||
1326 | /* get routing information */ | |
1327 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
fb778ea1 | 1328 | rcu_read_lock(); |
7aadf889 ML |
1329 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
1330 | ||
44524fcd ML |
1331 | if (!orig_node) |
1332 | goto unlock; | |
1333 | ||
fb778ea1 | 1334 | rcu_read_unlock(); |
c6c8fea2 | 1335 | |
a4c135c5 | 1336 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 1337 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 1338 | |
44524fcd | 1339 | if (!neigh_node) { |
c6c8fea2 | 1340 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
44524fcd | 1341 | goto out; |
c6c8fea2 SE |
1342 | } |
1343 | ||
1344 | /* don't lock while sending the packets ... we therefore | |
1345 | * copy the required data before sending */ | |
44524fcd ML |
1346 | batman_if = neigh_node->if_incoming; |
1347 | memcpy(dstaddr, neigh_node->addr, ETH_ALEN); | |
c6c8fea2 SE |
1348 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
1349 | ||
1350 | /* create a copy of the skb, if needed, to modify it. */ | |
1351 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 1352 | goto out; |
c6c8fea2 SE |
1353 | |
1354 | unicast_packet = (struct unicast_packet *)skb->data; | |
1355 | ||
1356 | if (unicast_packet->packet_type == BAT_UNICAST && | |
1357 | atomic_read(&bat_priv->fragmentation) && | |
1358 | skb->len > batman_if->net_dev->mtu) | |
1359 | return frag_send_skb(skb, bat_priv, batman_if, | |
1360 | dstaddr); | |
1361 | ||
1362 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
ae361ce1 | 1363 | frag_can_reassemble(skb, batman_if->net_dev->mtu)) { |
c6c8fea2 SE |
1364 | |
1365 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1366 | ||
1367 | if (ret == NET_RX_DROP) | |
44524fcd | 1368 | goto out; |
c6c8fea2 SE |
1369 | |
1370 | /* packet was buffered for late merge */ | |
44524fcd ML |
1371 | if (!new_skb) { |
1372 | ret = NET_RX_SUCCESS; | |
1373 | goto out; | |
1374 | } | |
c6c8fea2 SE |
1375 | |
1376 | skb = new_skb; | |
1377 | unicast_packet = (struct unicast_packet *)skb->data; | |
1378 | } | |
1379 | ||
1380 | /* decrement ttl */ | |
1381 | unicast_packet->ttl--; | |
1382 | ||
1383 | /* route it */ | |
1384 | send_skb_packet(skb, batman_if, dstaddr); | |
44524fcd ML |
1385 | ret = NET_RX_SUCCESS; |
1386 | goto out; | |
c6c8fea2 | 1387 | |
44524fcd ML |
1388 | unlock: |
1389 | rcu_read_unlock(); | |
1390 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
1391 | out: | |
1392 | if (neigh_node) | |
1393 | neigh_node_free_ref(neigh_node); | |
1394 | if (orig_node) | |
7b36e8ee | 1395 | orig_node_free_ref(orig_node); |
44524fcd | 1396 | return ret; |
c6c8fea2 SE |
1397 | } |
1398 | ||
1399 | int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) | |
1400 | { | |
1401 | struct unicast_packet *unicast_packet; | |
1402 | int hdr_size = sizeof(struct unicast_packet); | |
1403 | ||
1404 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1405 | return NET_RX_DROP; | |
1406 | ||
1407 | unicast_packet = (struct unicast_packet *)skb->data; | |
1408 | ||
1409 | /* packet for me */ | |
1410 | if (is_my_mac(unicast_packet->dest)) { | |
1411 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
1412 | return NET_RX_SUCCESS; | |
1413 | } | |
1414 | ||
1415 | return route_unicast_packet(skb, recv_if, hdr_size); | |
1416 | } | |
1417 | ||
1418 | int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) | |
1419 | { | |
1420 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1421 | struct unicast_frag_packet *unicast_packet; | |
1422 | int hdr_size = sizeof(struct unicast_frag_packet); | |
1423 | struct sk_buff *new_skb = NULL; | |
1424 | int ret; | |
1425 | ||
1426 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1427 | return NET_RX_DROP; | |
1428 | ||
1429 | unicast_packet = (struct unicast_frag_packet *)skb->data; | |
1430 | ||
1431 | /* packet for me */ | |
1432 | if (is_my_mac(unicast_packet->dest)) { | |
1433 | ||
1434 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1435 | ||
1436 | if (ret == NET_RX_DROP) | |
1437 | return NET_RX_DROP; | |
1438 | ||
1439 | /* packet was buffered for late merge */ | |
1440 | if (!new_skb) | |
1441 | return NET_RX_SUCCESS; | |
1442 | ||
1443 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1444 | sizeof(struct unicast_packet)); | |
1445 | return NET_RX_SUCCESS; | |
1446 | } | |
1447 | ||
1448 | return route_unicast_packet(skb, recv_if, hdr_size); | |
1449 | } | |
1450 | ||
1451 | ||
1452 | int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) | |
1453 | { | |
1454 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1455 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1456 | struct bcast_packet *bcast_packet; |
1457 | struct ethhdr *ethhdr; | |
1458 | int hdr_size = sizeof(struct bcast_packet); | |
f3e0008f | 1459 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1460 | int32_t seq_diff; |
1461 | ||
1462 | /* drop packet if it has not necessary minimum size */ | |
1463 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1464 | goto out; |
c6c8fea2 SE |
1465 | |
1466 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1467 | ||
1468 | /* packet with broadcast indication but unicast recipient */ | |
1469 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1470 | goto out; |
c6c8fea2 SE |
1471 | |
1472 | /* packet with broadcast sender address */ | |
1473 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1474 | goto out; |
c6c8fea2 SE |
1475 | |
1476 | /* ignore broadcasts sent by myself */ | |
1477 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1478 | goto out; |
c6c8fea2 SE |
1479 | |
1480 | bcast_packet = (struct bcast_packet *)skb->data; | |
1481 | ||
1482 | /* ignore broadcasts originated by myself */ | |
1483 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1484 | goto out; |
c6c8fea2 SE |
1485 | |
1486 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1487 | goto out; |
c6c8fea2 SE |
1488 | |
1489 | spin_lock_bh(&bat_priv->orig_hash_lock); | |
fb778ea1 | 1490 | rcu_read_lock(); |
7aadf889 | 1491 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1492 | |
1493 | if (!orig_node) | |
1494 | goto rcu_unlock; | |
1495 | ||
fb778ea1 | 1496 | rcu_read_unlock(); |
c6c8fea2 | 1497 | |
f3e0008f | 1498 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1499 | |
1500 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1501 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1502 | ntohl(bcast_packet->seqno))) | |
1503 | goto spin_unlock; | |
c6c8fea2 SE |
1504 | |
1505 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1506 | ||
1507 | /* check whether the packet is old and the host just restarted. */ | |
1508 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1509 | &orig_node->bcast_seqno_reset)) |
1510 | goto spin_unlock; | |
c6c8fea2 SE |
1511 | |
1512 | /* mark broadcast in flood history, update window position | |
1513 | * if required. */ | |
1514 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1515 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1516 | ||
f3e0008f | 1517 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1518 | spin_unlock_bh(&bat_priv->orig_hash_lock); |
f3e0008f | 1519 | |
c6c8fea2 SE |
1520 | /* rebroadcast packet */ |
1521 | add_bcast_packet_to_list(bat_priv, skb); | |
1522 | ||
1523 | /* broadcast for me */ | |
1524 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1525 | ret = NET_RX_SUCCESS; |
1526 | goto out; | |
c6c8fea2 | 1527 | |
f3e0008f ML |
1528 | rcu_unlock: |
1529 | rcu_read_unlock(); | |
1530 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
1531 | goto out; | |
1532 | spin_unlock: | |
1533 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
1534 | spin_unlock_bh(&bat_priv->orig_hash_lock); | |
1535 | out: | |
1536 | if (orig_node) | |
7b36e8ee | 1537 | orig_node_free_ref(orig_node); |
f3e0008f | 1538 | return ret; |
c6c8fea2 SE |
1539 | } |
1540 | ||
1541 | int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if) | |
1542 | { | |
1543 | struct vis_packet *vis_packet; | |
1544 | struct ethhdr *ethhdr; | |
1545 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1546 | int hdr_size = sizeof(struct vis_packet); | |
1547 | ||
1548 | /* keep skb linear */ | |
1549 | if (skb_linearize(skb) < 0) | |
1550 | return NET_RX_DROP; | |
1551 | ||
1552 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1553 | return NET_RX_DROP; | |
1554 | ||
1555 | vis_packet = (struct vis_packet *)skb->data; | |
1556 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1557 | ||
1558 | /* not for me */ | |
1559 | if (!is_my_mac(ethhdr->h_dest)) | |
1560 | return NET_RX_DROP; | |
1561 | ||
1562 | /* ignore own packets */ | |
1563 | if (is_my_mac(vis_packet->vis_orig)) | |
1564 | return NET_RX_DROP; | |
1565 | ||
1566 | if (is_my_mac(vis_packet->sender_orig)) | |
1567 | return NET_RX_DROP; | |
1568 | ||
1569 | switch (vis_packet->vis_type) { | |
1570 | case VIS_TYPE_SERVER_SYNC: | |
1571 | receive_server_sync_packet(bat_priv, vis_packet, | |
1572 | skb_headlen(skb)); | |
1573 | break; | |
1574 | ||
1575 | case VIS_TYPE_CLIENT_UPDATE: | |
1576 | receive_client_update_packet(bat_priv, vis_packet, | |
1577 | skb_headlen(skb)); | |
1578 | break; | |
1579 | ||
1580 | default: /* ignore unknown packet */ | |
1581 | break; | |
1582 | } | |
1583 | ||
1584 | /* We take a copy of the data in the packet, so we should | |
1585 | always free the skbuf. */ | |
1586 | return NET_RX_DROP; | |
1587 | } |