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 | ||
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 | ||
2dafb49d AQ |
67 | static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node, |
68 | unsigned char *tt_buff, int tt_buff_len) | |
c6c8fea2 | 69 | { |
2dafb49d AQ |
70 | if ((tt_buff_len != orig_node->tt_buff_len) || |
71 | ((tt_buff_len > 0) && | |
72 | (orig_node->tt_buff_len > 0) && | |
73 | (memcmp(orig_node->tt_buff, tt_buff, tt_buff_len) != 0))) { | |
74 | ||
75 | if (orig_node->tt_buff_len > 0) | |
76 | tt_global_del_orig(bat_priv, orig_node, | |
77 | "originator changed tt"); | |
78 | ||
79 | if ((tt_buff_len > 0) && (tt_buff)) | |
80 | tt_global_add_orig(bat_priv, orig_node, | |
81 | tt_buff, tt_buff_len); | |
c6c8fea2 SE |
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, | |
2dafb49d | 88 | unsigned char *tt_buff, int tt_buff_len) |
c6c8fea2 | 89 | { |
e1a5382f LL |
90 | struct neigh_node *curr_router; |
91 | ||
92 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 93 | |
c6c8fea2 | 94 | /* route deleted */ |
e1a5382f | 95 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
96 | |
97 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", | |
98 | orig_node->orig); | |
2dafb49d | 99 | tt_global_del_orig(bat_priv, orig_node, |
c6c8fea2 SE |
100 | "originator timed out"); |
101 | ||
e1a5382f LL |
102 | /* route added */ |
103 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
104 | |
105 | bat_dbg(DBG_ROUTES, bat_priv, | |
106 | "Adding route towards: %pM (via %pM)\n", | |
107 | orig_node->orig, neigh_node->addr); | |
2dafb49d AQ |
108 | tt_global_add_orig(bat_priv, orig_node, |
109 | tt_buff, tt_buff_len); | |
c6c8fea2 | 110 | |
e1a5382f | 111 | /* route changed */ |
c6c8fea2 SE |
112 | } else { |
113 | bat_dbg(DBG_ROUTES, bat_priv, | |
114 | "Changing route towards: %pM " | |
115 | "(now via %pM - was via %pM)\n", | |
116 | orig_node->orig, neigh_node->addr, | |
e1a5382f | 117 | curr_router->addr); |
c6c8fea2 SE |
118 | } |
119 | ||
e1a5382f LL |
120 | if (curr_router) |
121 | neigh_node_free_ref(curr_router); | |
122 | ||
123 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
124 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
125 | neigh_node = NULL; | |
e1a5382f LL |
126 | |
127 | spin_lock_bh(&orig_node->neigh_list_lock); | |
128 | rcu_assign_pointer(orig_node->router, neigh_node); | |
129 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
130 | ||
131 | /* decrease refcount of previous best neighbor */ | |
132 | if (curr_router) | |
133 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
134 | } |
135 | ||
136 | ||
137 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
2dafb49d AQ |
138 | struct neigh_node *neigh_node, unsigned char *tt_buff, |
139 | int tt_buff_len) | |
c6c8fea2 | 140 | { |
e1a5382f | 141 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
142 | |
143 | if (!orig_node) | |
e1a5382f LL |
144 | goto out; |
145 | ||
146 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 147 | |
e1a5382f | 148 | if (router != neigh_node) |
c6c8fea2 | 149 | update_route(bat_priv, orig_node, neigh_node, |
2dafb49d AQ |
150 | tt_buff, tt_buff_len); |
151 | /* may be just TT changed */ | |
c6c8fea2 | 152 | else |
2dafb49d | 153 | update_TT(bat_priv, orig_node, tt_buff, tt_buff_len); |
e1a5382f LL |
154 | |
155 | out: | |
156 | if (router) | |
157 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
158 | } |
159 | ||
160 | static int is_bidirectional_neigh(struct orig_node *orig_node, | |
161 | struct orig_node *orig_neigh_node, | |
162 | struct batman_packet *batman_packet, | |
e6c10f43 | 163 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
164 | { |
165 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1605d0d6 | 166 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; |
9591a79f | 167 | struct hlist_node *node; |
c6c8fea2 | 168 | unsigned char total_count; |
0ede9f41 ML |
169 | uint8_t orig_eq_count, neigh_rq_count, tq_own; |
170 | int tq_asym_penalty, ret = 0; | |
c6c8fea2 | 171 | |
27aea212 DF |
172 | /* find corresponding one hop neighbor */ |
173 | rcu_read_lock(); | |
174 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
175 | &orig_neigh_node->neigh_list, list) { | |
1605d0d6 | 176 | |
27aea212 DF |
177 | if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig)) |
178 | continue; | |
c6c8fea2 | 179 | |
27aea212 DF |
180 | if (tmp_neigh_node->if_incoming != if_incoming) |
181 | continue; | |
c6c8fea2 | 182 | |
27aea212 DF |
183 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
184 | continue; | |
1605d0d6 | 185 | |
27aea212 DF |
186 | neigh_node = tmp_neigh_node; |
187 | break; | |
188 | } | |
189 | rcu_read_unlock(); | |
1605d0d6 | 190 | |
27aea212 DF |
191 | if (!neigh_node) |
192 | neigh_node = create_neighbor(orig_neigh_node, | |
193 | orig_neigh_node, | |
194 | orig_neigh_node->orig, | |
195 | if_incoming); | |
1605d0d6 | 196 | |
27aea212 DF |
197 | if (!neigh_node) |
198 | goto out; | |
c6c8fea2 | 199 | |
27aea212 DF |
200 | /* if orig_node is direct neighbour update neigh_node last_valid */ |
201 | if (orig_node == orig_neigh_node) | |
202 | neigh_node->last_valid = jiffies; | |
c6c8fea2 SE |
203 | |
204 | orig_node->last_valid = jiffies; | |
205 | ||
27aea212 | 206 | /* find packet count of corresponding one hop neighbor */ |
0ede9f41 ML |
207 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
208 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
209 | neigh_rq_count = neigh_node->real_packet_count; | |
210 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
211 | ||
c6c8fea2 | 212 | /* pay attention to not get a value bigger than 100 % */ |
0ede9f41 ML |
213 | total_count = (orig_eq_count > neigh_rq_count ? |
214 | neigh_rq_count : orig_eq_count); | |
c6c8fea2 SE |
215 | |
216 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
217 | /* if we receive too few packets it is not considered bidirectional */ | |
218 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
0ede9f41 ML |
219 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
220 | tq_own = 0; | |
c6c8fea2 SE |
221 | else |
222 | /* neigh_node->real_packet_count is never zero as we | |
223 | * only purge old information when getting new | |
224 | * information */ | |
0ede9f41 | 225 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
c6c8fea2 SE |
226 | |
227 | /* | |
228 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does | |
229 | * affect the nearly-symmetric links only a little, but | |
230 | * punishes asymmetric links more. This will give a value | |
231 | * between 0 and TQ_MAX_VALUE | |
232 | */ | |
0ede9f41 ML |
233 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
234 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
235 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
236 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
237 | (TQ_LOCAL_WINDOW_SIZE * | |
238 | TQ_LOCAL_WINDOW_SIZE * | |
239 | TQ_LOCAL_WINDOW_SIZE); | |
240 | ||
241 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / | |
242 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
c6c8fea2 SE |
243 | |
244 | bat_dbg(DBG_BATMAN, bat_priv, | |
245 | "bidirectional: " | |
246 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
247 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
248 | "total tq: %3i\n", | |
249 | orig_node->orig, orig_neigh_node->orig, total_count, | |
0ede9f41 | 250 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
c6c8fea2 SE |
251 | |
252 | /* if link has the minimum required transmission quality | |
253 | * consider it bidirectional */ | |
254 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
a775eb84 ML |
255 | ret = 1; |
256 | ||
a775eb84 ML |
257 | out: |
258 | if (neigh_node) | |
44524fcd | 259 | neigh_node_free_ref(neigh_node); |
a775eb84 | 260 | return ret; |
c6c8fea2 SE |
261 | } |
262 | ||
a4c135c5 SW |
263 | /* caller must hold the neigh_list_lock */ |
264 | void bonding_candidate_del(struct orig_node *orig_node, | |
265 | struct neigh_node *neigh_node) | |
266 | { | |
267 | /* this neighbor is not part of our candidate list */ | |
268 | if (list_empty(&neigh_node->bonding_list)) | |
269 | goto out; | |
270 | ||
271 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 272 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 273 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
274 | atomic_dec(&orig_node->bond_candidates); |
275 | ||
276 | out: | |
277 | return; | |
278 | } | |
279 | ||
280 | static void bonding_candidate_add(struct orig_node *orig_node, | |
281 | struct neigh_node *neigh_node) | |
282 | { | |
283 | struct hlist_node *node; | |
e1a5382f LL |
284 | struct neigh_node *tmp_neigh_node, *router = NULL; |
285 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
286 | |
287 | spin_lock_bh(&orig_node->neigh_list_lock); | |
288 | ||
289 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
290 | if (!compare_eth(orig_node->orig, |
291 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
292 | goto candidate_del; |
293 | ||
e1a5382f LL |
294 | router = orig_node_get_router(orig_node); |
295 | if (!router) | |
a4c135c5 SW |
296 | goto candidate_del; |
297 | ||
a4c135c5 | 298 | /* ... and is good enough to be considered */ |
e1a5382f | 299 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
300 | goto candidate_del; |
301 | ||
302 | /** | |
303 | * check if we have another candidate with the same mac address or | |
304 | * interface. If we do, we won't select this candidate because of | |
305 | * possible interference. | |
306 | */ | |
307 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
308 | &orig_node->neigh_list, list) { | |
309 | ||
310 | if (tmp_neigh_node == neigh_node) | |
311 | continue; | |
312 | ||
313 | /* we only care if the other candidate is even | |
314 | * considered as candidate. */ | |
315 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
316 | continue; | |
317 | ||
318 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 319 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
320 | interference_candidate = 1; |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
325 | /* don't care further if it is an interference candidate */ | |
326 | if (interference_candidate) | |
327 | goto candidate_del; | |
328 | ||
329 | /* this neighbor already is part of our candidate list */ | |
330 | if (!list_empty(&neigh_node->bonding_list)) | |
331 | goto out; | |
332 | ||
44524fcd ML |
333 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
334 | goto out; | |
335 | ||
a4c135c5 | 336 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
337 | atomic_inc(&orig_node->bond_candidates); |
338 | goto out; | |
339 | ||
340 | candidate_del: | |
341 | bonding_candidate_del(orig_node, neigh_node); | |
342 | ||
343 | out: | |
344 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
345 | |
346 | if (router) | |
347 | neigh_node_free_ref(router); | |
a4c135c5 SW |
348 | } |
349 | ||
350 | /* copy primary address for bonding */ | |
351 | static void bonding_save_primary(struct orig_node *orig_node, | |
352 | struct orig_node *orig_neigh_node, | |
353 | struct batman_packet *batman_packet) | |
354 | { | |
355 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) | |
356 | return; | |
357 | ||
358 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
359 | } | |
360 | ||
c6c8fea2 SE |
361 | static void update_orig(struct bat_priv *bat_priv, |
362 | struct orig_node *orig_node, | |
363 | struct ethhdr *ethhdr, | |
364 | struct batman_packet *batman_packet, | |
e6c10f43 | 365 | struct hard_iface *if_incoming, |
2dafb49d | 366 | unsigned char *tt_buff, int tt_buff_len, |
c6c8fea2 SE |
367 | char is_duplicate) |
368 | { | |
369 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
e1a5382f | 370 | struct neigh_node *router = NULL; |
2ae2daf6 | 371 | struct orig_node *orig_node_tmp; |
9591a79f | 372 | struct hlist_node *node; |
2dafb49d | 373 | int tmp_tt_buff_len; |
2ae2daf6 | 374 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
c6c8fea2 SE |
375 | |
376 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " | |
377 | "Searching and updating originator entry of received packet\n"); | |
378 | ||
f987ed6e ML |
379 | rcu_read_lock(); |
380 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
381 | &orig_node->neigh_list, list) { | |
39901e71 | 382 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
44524fcd ML |
383 | (tmp_neigh_node->if_incoming == if_incoming) && |
384 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
385 | if (neigh_node) | |
386 | neigh_node_free_ref(neigh_node); | |
c6c8fea2 SE |
387 | neigh_node = tmp_neigh_node; |
388 | continue; | |
389 | } | |
390 | ||
391 | if (is_duplicate) | |
392 | continue; | |
393 | ||
68003903 | 394 | spin_lock_bh(&tmp_neigh_node->tq_lock); |
c6c8fea2 SE |
395 | ring_buffer_set(tmp_neigh_node->tq_recv, |
396 | &tmp_neigh_node->tq_index, 0); | |
397 | tmp_neigh_node->tq_avg = | |
398 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
68003903 | 399 | spin_unlock_bh(&tmp_neigh_node->tq_lock); |
c6c8fea2 SE |
400 | } |
401 | ||
402 | if (!neigh_node) { | |
403 | struct orig_node *orig_tmp; | |
404 | ||
405 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
406 | if (!orig_tmp) | |
a775eb84 | 407 | goto unlock; |
c6c8fea2 SE |
408 | |
409 | neigh_node = create_neighbor(orig_node, orig_tmp, | |
410 | ethhdr->h_source, if_incoming); | |
16b1aba8 | 411 | |
7b36e8ee | 412 | orig_node_free_ref(orig_tmp); |
c6c8fea2 | 413 | if (!neigh_node) |
a775eb84 | 414 | goto unlock; |
c6c8fea2 SE |
415 | } else |
416 | bat_dbg(DBG_BATMAN, bat_priv, | |
417 | "Updating existing last-hop neighbor of originator\n"); | |
418 | ||
a775eb84 ML |
419 | rcu_read_unlock(); |
420 | ||
c6c8fea2 SE |
421 | orig_node->flags = batman_packet->flags; |
422 | neigh_node->last_valid = jiffies; | |
423 | ||
68003903 | 424 | spin_lock_bh(&neigh_node->tq_lock); |
c6c8fea2 SE |
425 | ring_buffer_set(neigh_node->tq_recv, |
426 | &neigh_node->tq_index, | |
427 | batman_packet->tq); | |
428 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
68003903 | 429 | spin_unlock_bh(&neigh_node->tq_lock); |
c6c8fea2 SE |
430 | |
431 | if (!is_duplicate) { | |
432 | orig_node->last_ttl = batman_packet->ttl; | |
433 | neigh_node->last_ttl = batman_packet->ttl; | |
434 | } | |
435 | ||
a4c135c5 SW |
436 | bonding_candidate_add(orig_node, neigh_node); |
437 | ||
2dafb49d AQ |
438 | tmp_tt_buff_len = (tt_buff_len > batman_packet->num_tt * ETH_ALEN ? |
439 | batman_packet->num_tt * ETH_ALEN : tt_buff_len); | |
c6c8fea2 SE |
440 | |
441 | /* if this neighbor already is our next hop there is nothing | |
442 | * to change */ | |
e1a5382f LL |
443 | router = orig_node_get_router(orig_node); |
444 | if (router == neigh_node) | |
2dafb49d | 445 | goto update_tt; |
c6c8fea2 SE |
446 | |
447 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
e1a5382f | 448 | if (router && (router->tq_avg > neigh_node->tq_avg)) |
2dafb49d | 449 | goto update_tt; |
c6c8fea2 SE |
450 | |
451 | /* if the TQ is the same and the link not more symetric we | |
452 | * won't consider it either */ | |
e1a5382f LL |
453 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
454 | orig_node_tmp = router->orig_node; | |
2ae2daf6 ML |
455 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
456 | bcast_own_sum_orig = | |
457 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
458 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
459 | ||
460 | orig_node_tmp = neigh_node->orig_node; | |
461 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
462 | bcast_own_sum_neigh = | |
463 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
464 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
465 | ||
466 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
2dafb49d | 467 | goto update_tt; |
2ae2daf6 | 468 | } |
c6c8fea2 SE |
469 | |
470 | update_routes(bat_priv, orig_node, neigh_node, | |
2dafb49d | 471 | tt_buff, tmp_tt_buff_len); |
c6c8fea2 SE |
472 | goto update_gw; |
473 | ||
2dafb49d | 474 | update_tt: |
e1a5382f | 475 | update_routes(bat_priv, orig_node, router, |
2dafb49d | 476 | tt_buff, tmp_tt_buff_len); |
c6c8fea2 SE |
477 | |
478 | update_gw: | |
479 | if (orig_node->gw_flags != batman_packet->gw_flags) | |
480 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); | |
481 | ||
482 | orig_node->gw_flags = batman_packet->gw_flags; | |
483 | ||
484 | /* restart gateway selection if fast or late switching was enabled */ | |
485 | if ((orig_node->gw_flags) && | |
486 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
487 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
488 | gw_check_election(bat_priv, orig_node); | |
a775eb84 ML |
489 | |
490 | goto out; | |
491 | ||
492 | unlock: | |
493 | rcu_read_unlock(); | |
494 | out: | |
495 | if (neigh_node) | |
44524fcd | 496 | neigh_node_free_ref(neigh_node); |
e1a5382f LL |
497 | if (router) |
498 | neigh_node_free_ref(router); | |
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 | 599 | struct batman_packet *batman_packet, |
2dafb49d | 600 | unsigned char *tt_buff, int tt_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 | 605 | struct orig_node *orig_neigh_node, *orig_node; |
e1a5382f LL |
606 | struct neigh_node *router = NULL, *router_router = NULL; |
607 | struct neigh_node *orig_neigh_router = NULL; | |
c6c8fea2 SE |
608 | char has_directlink_flag; |
609 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
610 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
611 | char is_duplicate; | |
612 | uint32_t if_incoming_seqno; | |
613 | ||
614 | /* Silently drop when the batman packet is actually not a | |
615 | * correct packet. | |
616 | * | |
617 | * This might happen if a packet is padded (e.g. Ethernet has a | |
618 | * minimum frame length of 64 byte) and the aggregation interprets | |
619 | * it as an additional length. | |
620 | * | |
621 | * TODO: A more sane solution would be to have a bit in the | |
622 | * batman_packet to detect whether the packet is the last | |
623 | * packet in an aggregation. Here we expect that the padding | |
624 | * is always zero (or not 0x01) | |
625 | */ | |
626 | if (batman_packet->packet_type != BAT_PACKET) | |
627 | return; | |
628 | ||
629 | /* could be changed by schedule_own_packet() */ | |
630 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
631 | ||
632 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); | |
633 | ||
39901e71 ML |
634 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
635 | batman_packet->orig) ? 1 : 0); | |
c6c8fea2 SE |
636 | |
637 | bat_dbg(DBG_BATMAN, bat_priv, | |
638 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " | |
639 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " | |
640 | "TTL %d, V %d, IDF %d)\n", | |
641 | ethhdr->h_source, if_incoming->net_dev->name, | |
642 | if_incoming->net_dev->dev_addr, batman_packet->orig, | |
643 | batman_packet->prev_sender, batman_packet->seqno, | |
644 | batman_packet->tq, batman_packet->ttl, batman_packet->version, | |
645 | has_directlink_flag); | |
646 | ||
647 | rcu_read_lock(); | |
e6c10f43 ML |
648 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
649 | if (hard_iface->if_status != IF_ACTIVE) | |
c6c8fea2 SE |
650 | continue; |
651 | ||
e6c10f43 | 652 | if (hard_iface->soft_iface != if_incoming->soft_iface) |
c6c8fea2 SE |
653 | continue; |
654 | ||
39901e71 | 655 | if (compare_eth(ethhdr->h_source, |
e6c10f43 | 656 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
657 | is_my_addr = 1; |
658 | ||
39901e71 | 659 | if (compare_eth(batman_packet->orig, |
e6c10f43 | 660 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
661 | is_my_orig = 1; |
662 | ||
39901e71 | 663 | if (compare_eth(batman_packet->prev_sender, |
e6c10f43 | 664 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
665 | is_my_oldorig = 1; |
666 | ||
39901e71 | 667 | if (compare_eth(ethhdr->h_source, broadcast_addr)) |
c6c8fea2 SE |
668 | is_broadcast = 1; |
669 | } | |
670 | rcu_read_unlock(); | |
671 | ||
672 | if (batman_packet->version != COMPAT_VERSION) { | |
673 | bat_dbg(DBG_BATMAN, bat_priv, | |
674 | "Drop packet: incompatible batman version (%i)\n", | |
675 | batman_packet->version); | |
676 | return; | |
677 | } | |
678 | ||
679 | if (is_my_addr) { | |
680 | bat_dbg(DBG_BATMAN, bat_priv, | |
681 | "Drop packet: received my own broadcast (sender: %pM" | |
682 | ")\n", | |
683 | ethhdr->h_source); | |
684 | return; | |
685 | } | |
686 | ||
687 | if (is_broadcast) { | |
688 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
689 | "ignoring all packets with broadcast source addr (sender: %pM" | |
690 | ")\n", ethhdr->h_source); | |
691 | return; | |
692 | } | |
693 | ||
694 | if (is_my_orig) { | |
695 | unsigned long *word; | |
696 | int offset; | |
697 | ||
698 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
c6c8fea2 SE |
699 | if (!orig_neigh_node) |
700 | return; | |
701 | ||
702 | /* neighbor has to indicate direct link and it has to | |
703 | * come via the corresponding interface */ | |
704 | /* if received seqno equals last send seqno save new | |
705 | * seqno for bidirectional check */ | |
706 | if (has_directlink_flag && | |
39901e71 ML |
707 | compare_eth(if_incoming->net_dev->dev_addr, |
708 | batman_packet->orig) && | |
c6c8fea2 SE |
709 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
710 | offset = if_incoming->if_num * NUM_WORDS; | |
2ae2daf6 ML |
711 | |
712 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
c6c8fea2 SE |
713 | word = &(orig_neigh_node->bcast_own[offset]); |
714 | bit_mark(word, 0); | |
715 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
716 | bit_packet_count(word); | |
2ae2daf6 | 717 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
c6c8fea2 SE |
718 | } |
719 | ||
720 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
721 | "originator packet from myself (via neighbor)\n"); | |
7b36e8ee | 722 | orig_node_free_ref(orig_neigh_node); |
c6c8fea2 SE |
723 | return; |
724 | } | |
725 | ||
726 | if (is_my_oldorig) { | |
727 | bat_dbg(DBG_BATMAN, bat_priv, | |
728 | "Drop packet: ignoring all rebroadcast echos (sender: " | |
729 | "%pM)\n", ethhdr->h_source); | |
730 | return; | |
731 | } | |
732 | ||
733 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
734 | if (!orig_node) | |
735 | return; | |
736 | ||
737 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
738 | ||
739 | if (is_duplicate == -1) { | |
740 | bat_dbg(DBG_BATMAN, bat_priv, | |
741 | "Drop packet: packet within seqno protection time " | |
742 | "(sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 743 | goto out; |
c6c8fea2 SE |
744 | } |
745 | ||
746 | if (batman_packet->tq == 0) { | |
747 | bat_dbg(DBG_BATMAN, bat_priv, | |
748 | "Drop packet: originator packet with tq equal 0\n"); | |
16b1aba8 | 749 | goto out; |
c6c8fea2 SE |
750 | } |
751 | ||
e1a5382f LL |
752 | router = orig_node_get_router(orig_node); |
753 | if (router) | |
754 | router_router = orig_node_get_router(router->orig_node); | |
755 | ||
c6c8fea2 | 756 | /* avoid temporary routing loops */ |
e1a5382f LL |
757 | if (router && router_router && |
758 | (compare_eth(router->addr, batman_packet->prev_sender)) && | |
39901e71 | 759 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && |
e1a5382f | 760 | (compare_eth(router->addr, router_router->addr))) { |
c6c8fea2 SE |
761 | bat_dbg(DBG_BATMAN, bat_priv, |
762 | "Drop packet: ignoring all rebroadcast packets that " | |
763 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 764 | goto out; |
c6c8fea2 SE |
765 | } |
766 | ||
767 | /* if sender is a direct neighbor the sender mac equals | |
768 | * originator mac */ | |
769 | orig_neigh_node = (is_single_hop_neigh ? | |
770 | orig_node : | |
771 | get_orig_node(bat_priv, ethhdr->h_source)); | |
772 | if (!orig_neigh_node) | |
d0072609 | 773 | goto out; |
c6c8fea2 | 774 | |
e1a5382f LL |
775 | orig_neigh_router = orig_node_get_router(orig_neigh_node); |
776 | ||
c6c8fea2 SE |
777 | /* drop packet if sender is not a direct neighbor and if we |
778 | * don't route towards it */ | |
e1a5382f | 779 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
c6c8fea2 SE |
780 | bat_dbg(DBG_BATMAN, bat_priv, |
781 | "Drop packet: OGM via unknown neighbor!\n"); | |
16b1aba8 | 782 | goto out_neigh; |
c6c8fea2 SE |
783 | } |
784 | ||
785 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, | |
786 | batman_packet, if_incoming); | |
787 | ||
a4c135c5 SW |
788 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
789 | ||
c6c8fea2 SE |
790 | /* update ranking if it is not a duplicate or has the same |
791 | * seqno and similar ttl as the non-duplicate */ | |
792 | if (is_bidirectional && | |
793 | (!is_duplicate || | |
794 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
795 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
796 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, | |
2dafb49d | 797 | if_incoming, tt_buff, tt_buff_len, is_duplicate); |
c6c8fea2 | 798 | |
c6c8fea2 SE |
799 | /* is single hop (direct) neighbor */ |
800 | if (is_single_hop_neigh) { | |
801 | ||
802 | /* mark direct link on incoming interface */ | |
803 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
2dafb49d | 804 | 1, tt_buff_len, if_incoming); |
c6c8fea2 SE |
805 | |
806 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " | |
807 | "rebroadcast neighbor packet with direct link flag\n"); | |
16b1aba8 | 808 | goto out_neigh; |
c6c8fea2 SE |
809 | } |
810 | ||
811 | /* multihop originator */ | |
812 | if (!is_bidirectional) { | |
813 | bat_dbg(DBG_BATMAN, bat_priv, | |
814 | "Drop packet: not received via bidirectional link\n"); | |
16b1aba8 | 815 | goto out_neigh; |
c6c8fea2 SE |
816 | } |
817 | ||
818 | if (is_duplicate) { | |
819 | bat_dbg(DBG_BATMAN, bat_priv, | |
820 | "Drop packet: duplicate packet received\n"); | |
16b1aba8 | 821 | goto out_neigh; |
c6c8fea2 SE |
822 | } |
823 | ||
824 | bat_dbg(DBG_BATMAN, bat_priv, | |
825 | "Forwarding packet: rebroadcast originator packet\n"); | |
826 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
2dafb49d | 827 | 0, tt_buff_len, if_incoming); |
16b1aba8 ML |
828 | |
829 | out_neigh: | |
7b36e8ee ML |
830 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
831 | orig_node_free_ref(orig_neigh_node); | |
16b1aba8 | 832 | out: |
e1a5382f LL |
833 | if (router) |
834 | neigh_node_free_ref(router); | |
835 | if (router_router) | |
836 | neigh_node_free_ref(router_router); | |
837 | if (orig_neigh_router) | |
838 | neigh_node_free_ref(orig_neigh_router); | |
839 | ||
7b36e8ee | 840 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
841 | } |
842 | ||
e6c10f43 | 843 | int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 844 | { |
c6c8fea2 SE |
845 | struct ethhdr *ethhdr; |
846 | ||
847 | /* drop packet if it has not necessary minimum size */ | |
848 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) | |
849 | return NET_RX_DROP; | |
850 | ||
851 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
852 | ||
853 | /* packet with broadcast indication but unicast recipient */ | |
854 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
855 | return NET_RX_DROP; | |
856 | ||
857 | /* packet with broadcast sender address */ | |
858 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
859 | return NET_RX_DROP; | |
860 | ||
861 | /* create a copy of the skb, if needed, to modify it. */ | |
862 | if (skb_cow(skb, 0) < 0) | |
863 | return NET_RX_DROP; | |
864 | ||
865 | /* keep skb linear */ | |
866 | if (skb_linearize(skb) < 0) | |
867 | return NET_RX_DROP; | |
868 | ||
869 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
870 | ||
c6c8fea2 SE |
871 | receive_aggr_bat_packet(ethhdr, |
872 | skb->data, | |
873 | skb_headlen(skb), | |
e6c10f43 | 874 | hard_iface); |
c6c8fea2 SE |
875 | |
876 | kfree_skb(skb); | |
877 | return NET_RX_SUCCESS; | |
878 | } | |
879 | ||
880 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
881 | struct sk_buff *skb, size_t icmp_len) | |
882 | { | |
32ae9b22 | 883 | struct hard_iface *primary_if = NULL; |
44524fcd | 884 | struct orig_node *orig_node = NULL; |
e1a5382f | 885 | struct neigh_node *router = NULL; |
c6c8fea2 | 886 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 887 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
888 | |
889 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
890 | |
891 | /* add data to device queue */ | |
892 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
893 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 894 | goto out; |
c6c8fea2 SE |
895 | } |
896 | ||
32ae9b22 ML |
897 | primary_if = primary_if_get_selected(bat_priv); |
898 | if (!primary_if) | |
44524fcd | 899 | goto out; |
c6c8fea2 SE |
900 | |
901 | /* answer echo request (ping) */ | |
902 | /* get routing information */ | |
7aadf889 | 903 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 904 | if (!orig_node) |
e1a5382f | 905 | goto out; |
c6c8fea2 | 906 | |
e1a5382f LL |
907 | router = orig_node_get_router(orig_node); |
908 | if (!router) | |
909 | goto out; | |
c6c8fea2 | 910 | |
44524fcd ML |
911 | /* create a copy of the skb, if needed, to modify it. */ |
912 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
913 | goto out; | |
914 | ||
915 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
916 | ||
917 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 918 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd ML |
919 | icmp_packet->msg_type = ECHO_REPLY; |
920 | icmp_packet->ttl = TTL; | |
921 | ||
e1a5382f | 922 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 923 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 924 | |
44524fcd | 925 | out: |
32ae9b22 ML |
926 | if (primary_if) |
927 | hardif_free_ref(primary_if); | |
e1a5382f LL |
928 | if (router) |
929 | neigh_node_free_ref(router); | |
44524fcd | 930 | if (orig_node) |
7b36e8ee | 931 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
932 | return ret; |
933 | } | |
934 | ||
935 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 936 | struct sk_buff *skb) |
c6c8fea2 | 937 | { |
32ae9b22 | 938 | struct hard_iface *primary_if = NULL; |
44524fcd | 939 | struct orig_node *orig_node = NULL; |
e1a5382f | 940 | struct neigh_node *router = NULL; |
c6c8fea2 | 941 | struct icmp_packet *icmp_packet; |
44524fcd | 942 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
943 | |
944 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
945 | |
946 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
947 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
948 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
949 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
950 | icmp_packet->dst); | |
44524fcd | 951 | goto out; |
c6c8fea2 SE |
952 | } |
953 | ||
32ae9b22 ML |
954 | primary_if = primary_if_get_selected(bat_priv); |
955 | if (!primary_if) | |
44524fcd | 956 | goto out; |
c6c8fea2 SE |
957 | |
958 | /* get routing information */ | |
7aadf889 | 959 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 960 | if (!orig_node) |
e1a5382f | 961 | goto out; |
c6c8fea2 | 962 | |
e1a5382f LL |
963 | router = orig_node_get_router(orig_node); |
964 | if (!router) | |
965 | goto out; | |
c6c8fea2 | 966 | |
44524fcd ML |
967 | /* create a copy of the skb, if needed, to modify it. */ |
968 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
969 | goto out; | |
c6c8fea2 | 970 | |
44524fcd | 971 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 972 | |
44524fcd | 973 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 974 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd ML |
975 | icmp_packet->msg_type = TTL_EXCEEDED; |
976 | icmp_packet->ttl = TTL; | |
977 | ||
e1a5382f | 978 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 979 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 980 | |
44524fcd | 981 | out: |
32ae9b22 ML |
982 | if (primary_if) |
983 | hardif_free_ref(primary_if); | |
e1a5382f LL |
984 | if (router) |
985 | neigh_node_free_ref(router); | |
44524fcd | 986 | if (orig_node) |
7b36e8ee | 987 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
988 | return ret; |
989 | } | |
990 | ||
991 | ||
e6c10f43 | 992 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
993 | { |
994 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
995 | struct icmp_packet_rr *icmp_packet; | |
996 | struct ethhdr *ethhdr; | |
44524fcd | 997 | struct orig_node *orig_node = NULL; |
e1a5382f | 998 | struct neigh_node *router = NULL; |
c6c8fea2 | 999 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 1000 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1001 | |
1002 | /** | |
1003 | * we truncate all incoming icmp packets if they don't match our size | |
1004 | */ | |
1005 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
1006 | hdr_size = sizeof(struct icmp_packet_rr); | |
1007 | ||
1008 | /* drop packet if it has not necessary minimum size */ | |
1009 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 1010 | goto out; |
c6c8fea2 SE |
1011 | |
1012 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1013 | ||
1014 | /* packet with unicast indication but broadcast recipient */ | |
1015 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 1016 | goto out; |
c6c8fea2 SE |
1017 | |
1018 | /* packet with broadcast sender address */ | |
1019 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 1020 | goto out; |
c6c8fea2 SE |
1021 | |
1022 | /* not for me */ | |
1023 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 1024 | goto out; |
c6c8fea2 SE |
1025 | |
1026 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
1027 | ||
1028 | /* add record route information if not full */ | |
1029 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
1030 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
1031 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
1032 | ethhdr->h_dest, ETH_ALEN); | |
1033 | icmp_packet->rr_cur++; | |
1034 | } | |
1035 | ||
1036 | /* packet for me */ | |
1037 | if (is_my_mac(icmp_packet->dst)) | |
1038 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
1039 | ||
1040 | /* TTL exceeded */ | |
1041 | if (icmp_packet->ttl < 2) | |
74ef1153 | 1042 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 1043 | |
c6c8fea2 | 1044 | /* get routing information */ |
7aadf889 | 1045 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 1046 | if (!orig_node) |
e1a5382f | 1047 | goto out; |
c6c8fea2 | 1048 | |
e1a5382f LL |
1049 | router = orig_node_get_router(orig_node); |
1050 | if (!router) | |
1051 | goto out; | |
c6c8fea2 | 1052 | |
44524fcd ML |
1053 | /* create a copy of the skb, if needed, to modify it. */ |
1054 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1055 | goto out; | |
c6c8fea2 | 1056 | |
44524fcd | 1057 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 1058 | |
44524fcd ML |
1059 | /* decrement ttl */ |
1060 | icmp_packet->ttl--; | |
1061 | ||
1062 | /* route it */ | |
e1a5382f | 1063 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 1064 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 1065 | |
44524fcd | 1066 | out: |
e1a5382f LL |
1067 | if (router) |
1068 | neigh_node_free_ref(router); | |
44524fcd | 1069 | if (orig_node) |
7b36e8ee | 1070 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1071 | return ret; |
1072 | } | |
1073 | ||
55158629 LL |
1074 | /* In the bonding case, send the packets in a round |
1075 | * robin fashion over the remaining interfaces. | |
1076 | * | |
1077 | * This method rotates the bonding list and increases the | |
1078 | * returned router's refcount. */ | |
1079 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
1080 | struct hard_iface *recv_if) | |
1081 | { | |
1082 | struct neigh_node *tmp_neigh_node; | |
1083 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1084 | ||
1085 | rcu_read_lock(); | |
1086 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1087 | bonding_list) { | |
1088 | if (!first_candidate) | |
1089 | first_candidate = tmp_neigh_node; | |
1090 | ||
1091 | /* recv_if == NULL on the first node. */ | |
1092 | if (tmp_neigh_node->if_incoming == recv_if) | |
1093 | continue; | |
1094 | ||
1095 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1096 | continue; | |
1097 | ||
1098 | router = tmp_neigh_node; | |
1099 | break; | |
1100 | } | |
1101 | ||
1102 | /* use the first candidate if nothing was found. */ | |
1103 | if (!router && first_candidate && | |
1104 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1105 | router = first_candidate; | |
1106 | ||
1107 | if (!router) | |
1108 | goto out; | |
1109 | ||
1110 | /* selected should point to the next element | |
1111 | * after the current router */ | |
1112 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
1113 | /* this is a list_move(), which unfortunately | |
1114 | * does not exist as rcu version */ | |
1115 | list_del_rcu(&primary_orig->bond_list); | |
1116 | list_add_rcu(&primary_orig->bond_list, | |
1117 | &router->bonding_list); | |
1118 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
1119 | ||
1120 | out: | |
1121 | rcu_read_unlock(); | |
1122 | return router; | |
1123 | } | |
1124 | ||
1125 | /* Interface Alternating: Use the best of the | |
1126 | * remaining candidates which are not using | |
1127 | * this interface. | |
1128 | * | |
1129 | * Increases the returned router's refcount */ | |
1130 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
1131 | struct hard_iface *recv_if) | |
1132 | { | |
1133 | struct neigh_node *tmp_neigh_node; | |
1134 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1135 | ||
1136 | rcu_read_lock(); | |
1137 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1138 | bonding_list) { | |
1139 | if (!first_candidate) | |
1140 | first_candidate = tmp_neigh_node; | |
1141 | ||
1142 | /* recv_if == NULL on the first node. */ | |
1143 | if (tmp_neigh_node->if_incoming == recv_if) | |
1144 | continue; | |
1145 | ||
1146 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1147 | continue; | |
1148 | ||
1149 | /* if we don't have a router yet | |
1150 | * or this one is better, choose it. */ | |
1151 | if ((!router) || | |
1152 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
1153 | /* decrement refcount of | |
1154 | * previously selected router */ | |
1155 | if (router) | |
1156 | neigh_node_free_ref(router); | |
1157 | ||
1158 | router = tmp_neigh_node; | |
1159 | atomic_inc_not_zero(&router->refcount); | |
1160 | } | |
1161 | ||
1162 | neigh_node_free_ref(tmp_neigh_node); | |
1163 | } | |
1164 | ||
1165 | /* use the first candidate if nothing was found. */ | |
1166 | if (!router && first_candidate && | |
1167 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1168 | router = first_candidate; | |
1169 | ||
1170 | rcu_read_unlock(); | |
1171 | return router; | |
1172 | } | |
1173 | ||
c6c8fea2 | 1174 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
1175 | * bonding if possible. increases the found neighbors |
1176 | * refcount.*/ | |
c6c8fea2 SE |
1177 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
1178 | struct orig_node *orig_node, | |
e6c10f43 | 1179 | struct hard_iface *recv_if) |
c6c8fea2 SE |
1180 | { |
1181 | struct orig_node *primary_orig_node; | |
1182 | struct orig_node *router_orig; | |
55158629 | 1183 | struct neigh_node *router; |
c6c8fea2 SE |
1184 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
1185 | int bonding_enabled; | |
1186 | ||
1187 | if (!orig_node) | |
1188 | return NULL; | |
1189 | ||
e1a5382f LL |
1190 | router = orig_node_get_router(orig_node); |
1191 | if (!router) | |
01df2b65 | 1192 | goto err; |
c6c8fea2 SE |
1193 | |
1194 | /* without bonding, the first node should | |
1195 | * always choose the default router. */ | |
c6c8fea2 SE |
1196 | bonding_enabled = atomic_read(&bat_priv->bonding); |
1197 | ||
a4c135c5 SW |
1198 | rcu_read_lock(); |
1199 | /* select default router to output */ | |
e1a5382f | 1200 | router_orig = router->orig_node; |
01df2b65 ML |
1201 | if (!router_orig) |
1202 | goto err_unlock; | |
a4c135c5 | 1203 | |
a4c135c5 SW |
1204 | if ((!recv_if) && (!bonding_enabled)) |
1205 | goto return_router; | |
c6c8fea2 SE |
1206 | |
1207 | /* if we have something in the primary_addr, we can search | |
1208 | * for a potential bonding candidate. */ | |
39901e71 | 1209 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 1210 | goto return_router; |
c6c8fea2 SE |
1211 | |
1212 | /* find the orig_node which has the primary interface. might | |
1213 | * even be the same as our router_orig in many cases */ | |
1214 | ||
39901e71 | 1215 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
1216 | primary_orig_node = router_orig; |
1217 | } else { | |
7aadf889 ML |
1218 | primary_orig_node = orig_hash_find(bat_priv, |
1219 | router_orig->primary_addr); | |
c6c8fea2 | 1220 | if (!primary_orig_node) |
a4c135c5 | 1221 | goto return_router; |
7aadf889 | 1222 | |
7b36e8ee | 1223 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
1224 | } |
1225 | ||
1226 | /* with less than 2 candidates, we can't do any | |
1227 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
1228 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
1229 | goto return_router; | |
c6c8fea2 | 1230 | |
c6c8fea2 SE |
1231 | /* all nodes between should choose a candidate which |
1232 | * is is not on the interface where the packet came | |
1233 | * in. */ | |
a4c135c5 | 1234 | |
44524fcd | 1235 | neigh_node_free_ref(router); |
c6c8fea2 | 1236 | |
55158629 LL |
1237 | if (bonding_enabled) |
1238 | router = find_bond_router(primary_orig_node, recv_if); | |
1239 | else | |
1240 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 1241 | |
a4c135c5 | 1242 | return_router: |
e2cbc11c AQ |
1243 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
1244 | goto err_unlock; | |
1245 | ||
a4c135c5 | 1246 | rcu_read_unlock(); |
c6c8fea2 | 1247 | return router; |
01df2b65 ML |
1248 | err_unlock: |
1249 | rcu_read_unlock(); | |
1250 | err: | |
1251 | if (router) | |
1252 | neigh_node_free_ref(router); | |
1253 | return NULL; | |
c6c8fea2 SE |
1254 | } |
1255 | ||
1256 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
1257 | { | |
1258 | struct ethhdr *ethhdr; | |
1259 | ||
1260 | /* drop packet if it has not necessary minimum size */ | |
1261 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1262 | return -1; | |
1263 | ||
1264 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1265 | ||
1266 | /* packet with unicast indication but broadcast recipient */ | |
1267 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
1268 | return -1; | |
1269 | ||
1270 | /* packet with broadcast sender address */ | |
1271 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1272 | return -1; | |
1273 | ||
1274 | /* not for me */ | |
1275 | if (!is_my_mac(ethhdr->h_dest)) | |
1276 | return -1; | |
1277 | ||
1278 | return 0; | |
1279 | } | |
1280 | ||
7cefb149 | 1281 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1282 | { |
1283 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
1284 | struct orig_node *orig_node = NULL; |
1285 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1286 | struct unicast_packet *unicast_packet; |
1287 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 1288 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1289 | struct sk_buff *new_skb; |
1290 | ||
1291 | unicast_packet = (struct unicast_packet *)skb->data; | |
1292 | ||
1293 | /* TTL exceeded */ | |
1294 | if (unicast_packet->ttl < 2) { | |
1295 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
1296 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1297 | unicast_packet->dest); | |
44524fcd | 1298 | goto out; |
c6c8fea2 SE |
1299 | } |
1300 | ||
1301 | /* get routing information */ | |
7aadf889 ML |
1302 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
1303 | ||
44524fcd | 1304 | if (!orig_node) |
b5a6f69c | 1305 | goto out; |
c6c8fea2 | 1306 | |
a4c135c5 | 1307 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 1308 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 1309 | |
d0072609 | 1310 | if (!neigh_node) |
44524fcd | 1311 | goto out; |
c6c8fea2 SE |
1312 | |
1313 | /* create a copy of the skb, if needed, to modify it. */ | |
1314 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 1315 | goto out; |
c6c8fea2 SE |
1316 | |
1317 | unicast_packet = (struct unicast_packet *)skb->data; | |
1318 | ||
1319 | if (unicast_packet->packet_type == BAT_UNICAST && | |
1320 | atomic_read(&bat_priv->fragmentation) && | |
d0072609 ML |
1321 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
1322 | ret = frag_send_skb(skb, bat_priv, | |
1323 | neigh_node->if_incoming, neigh_node->addr); | |
1324 | goto out; | |
1325 | } | |
c6c8fea2 SE |
1326 | |
1327 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
d0072609 | 1328 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
1329 | |
1330 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1331 | ||
1332 | if (ret == NET_RX_DROP) | |
44524fcd | 1333 | goto out; |
c6c8fea2 SE |
1334 | |
1335 | /* packet was buffered for late merge */ | |
44524fcd ML |
1336 | if (!new_skb) { |
1337 | ret = NET_RX_SUCCESS; | |
1338 | goto out; | |
1339 | } | |
c6c8fea2 SE |
1340 | |
1341 | skb = new_skb; | |
1342 | unicast_packet = (struct unicast_packet *)skb->data; | |
1343 | } | |
1344 | ||
1345 | /* decrement ttl */ | |
1346 | unicast_packet->ttl--; | |
1347 | ||
1348 | /* route it */ | |
d0072609 | 1349 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 1350 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 1351 | |
44524fcd ML |
1352 | out: |
1353 | if (neigh_node) | |
1354 | neigh_node_free_ref(neigh_node); | |
1355 | if (orig_node) | |
7b36e8ee | 1356 | orig_node_free_ref(orig_node); |
44524fcd | 1357 | return ret; |
c6c8fea2 SE |
1358 | } |
1359 | ||
e6c10f43 | 1360 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1361 | { |
1362 | struct unicast_packet *unicast_packet; | |
1363 | int hdr_size = sizeof(struct unicast_packet); | |
1364 | ||
1365 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1366 | return NET_RX_DROP; | |
1367 | ||
1368 | unicast_packet = (struct unicast_packet *)skb->data; | |
1369 | ||
1370 | /* packet for me */ | |
1371 | if (is_my_mac(unicast_packet->dest)) { | |
1372 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
1373 | return NET_RX_SUCCESS; | |
1374 | } | |
1375 | ||
7cefb149 | 1376 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1377 | } |
1378 | ||
e6c10f43 | 1379 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1380 | { |
1381 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1382 | struct unicast_frag_packet *unicast_packet; | |
1383 | int hdr_size = sizeof(struct unicast_frag_packet); | |
1384 | struct sk_buff *new_skb = NULL; | |
1385 | int ret; | |
1386 | ||
1387 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1388 | return NET_RX_DROP; | |
1389 | ||
1390 | unicast_packet = (struct unicast_frag_packet *)skb->data; | |
1391 | ||
1392 | /* packet for me */ | |
1393 | if (is_my_mac(unicast_packet->dest)) { | |
1394 | ||
1395 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1396 | ||
1397 | if (ret == NET_RX_DROP) | |
1398 | return NET_RX_DROP; | |
1399 | ||
1400 | /* packet was buffered for late merge */ | |
1401 | if (!new_skb) | |
1402 | return NET_RX_SUCCESS; | |
1403 | ||
1404 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1405 | sizeof(struct unicast_packet)); | |
1406 | return NET_RX_SUCCESS; | |
1407 | } | |
1408 | ||
7cefb149 | 1409 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1410 | } |
1411 | ||
1412 | ||
e6c10f43 | 1413 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1414 | { |
1415 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1416 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1417 | struct bcast_packet *bcast_packet; |
1418 | struct ethhdr *ethhdr; | |
1419 | int hdr_size = sizeof(struct bcast_packet); | |
f3e0008f | 1420 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1421 | int32_t seq_diff; |
1422 | ||
1423 | /* drop packet if it has not necessary minimum size */ | |
1424 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1425 | goto out; |
c6c8fea2 SE |
1426 | |
1427 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1428 | ||
1429 | /* packet with broadcast indication but unicast recipient */ | |
1430 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1431 | goto out; |
c6c8fea2 SE |
1432 | |
1433 | /* packet with broadcast sender address */ | |
1434 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1435 | goto out; |
c6c8fea2 SE |
1436 | |
1437 | /* ignore broadcasts sent by myself */ | |
1438 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1439 | goto out; |
c6c8fea2 SE |
1440 | |
1441 | bcast_packet = (struct bcast_packet *)skb->data; | |
1442 | ||
1443 | /* ignore broadcasts originated by myself */ | |
1444 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1445 | goto out; |
c6c8fea2 SE |
1446 | |
1447 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1448 | goto out; |
c6c8fea2 | 1449 | |
7aadf889 | 1450 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1451 | |
1452 | if (!orig_node) | |
b5a6f69c | 1453 | goto out; |
c6c8fea2 | 1454 | |
f3e0008f | 1455 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1456 | |
1457 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1458 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1459 | ntohl(bcast_packet->seqno))) | |
1460 | goto spin_unlock; | |
c6c8fea2 SE |
1461 | |
1462 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1463 | ||
1464 | /* check whether the packet is old and the host just restarted. */ | |
1465 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1466 | &orig_node->bcast_seqno_reset)) |
1467 | goto spin_unlock; | |
c6c8fea2 SE |
1468 | |
1469 | /* mark broadcast in flood history, update window position | |
1470 | * if required. */ | |
1471 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1472 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1473 | ||
f3e0008f | 1474 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1475 | |
c6c8fea2 SE |
1476 | /* rebroadcast packet */ |
1477 | add_bcast_packet_to_list(bat_priv, skb); | |
1478 | ||
1479 | /* broadcast for me */ | |
1480 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1481 | ret = NET_RX_SUCCESS; |
1482 | goto out; | |
c6c8fea2 | 1483 | |
f3e0008f ML |
1484 | spin_unlock: |
1485 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1486 | out: |
1487 | if (orig_node) | |
7b36e8ee | 1488 | orig_node_free_ref(orig_node); |
f3e0008f | 1489 | return ret; |
c6c8fea2 SE |
1490 | } |
1491 | ||
e6c10f43 | 1492 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1493 | { |
1494 | struct vis_packet *vis_packet; | |
1495 | struct ethhdr *ethhdr; | |
1496 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1497 | int hdr_size = sizeof(struct vis_packet); | |
1498 | ||
1499 | /* keep skb linear */ | |
1500 | if (skb_linearize(skb) < 0) | |
1501 | return NET_RX_DROP; | |
1502 | ||
1503 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1504 | return NET_RX_DROP; | |
1505 | ||
1506 | vis_packet = (struct vis_packet *)skb->data; | |
1507 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1508 | ||
1509 | /* not for me */ | |
1510 | if (!is_my_mac(ethhdr->h_dest)) | |
1511 | return NET_RX_DROP; | |
1512 | ||
1513 | /* ignore own packets */ | |
1514 | if (is_my_mac(vis_packet->vis_orig)) | |
1515 | return NET_RX_DROP; | |
1516 | ||
1517 | if (is_my_mac(vis_packet->sender_orig)) | |
1518 | return NET_RX_DROP; | |
1519 | ||
1520 | switch (vis_packet->vis_type) { | |
1521 | case VIS_TYPE_SERVER_SYNC: | |
1522 | receive_server_sync_packet(bat_priv, vis_packet, | |
1523 | skb_headlen(skb)); | |
1524 | break; | |
1525 | ||
1526 | case VIS_TYPE_CLIENT_UPDATE: | |
1527 | receive_client_update_packet(bat_priv, vis_packet, | |
1528 | skb_headlen(skb)); | |
1529 | break; | |
1530 | ||
1531 | default: /* ignore unknown packet */ | |
1532 | break; | |
1533 | } | |
1534 | ||
1535 | /* We take a copy of the data in the packet, so we should | |
1536 | always free the skbuf. */ | |
1537 | return NET_RX_DROP; | |
1538 | } |