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 | 67 | static void update_TT(struct bat_priv *bat_priv, struct orig_node *orig_node, |
747e4221 | 68 | const 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 | ||
747e4221 | 85 | static void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
c6c8fea2 | 86 | struct neigh_node *neigh_node, |
747e4221 | 87 | const unsigned char *tt_buff, int tt_buff_len) |
c6c8fea2 | 88 | { |
e1a5382f LL |
89 | struct neigh_node *curr_router; |
90 | ||
91 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 92 | |
c6c8fea2 | 93 | /* route deleted */ |
e1a5382f | 94 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
95 | |
96 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", | |
97 | orig_node->orig); | |
2dafb49d | 98 | tt_global_del_orig(bat_priv, orig_node, |
c6c8fea2 SE |
99 | "originator timed out"); |
100 | ||
e1a5382f LL |
101 | /* route added */ |
102 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
103 | |
104 | bat_dbg(DBG_ROUTES, bat_priv, | |
105 | "Adding route towards: %pM (via %pM)\n", | |
106 | orig_node->orig, neigh_node->addr); | |
2dafb49d AQ |
107 | tt_global_add_orig(bat_priv, orig_node, |
108 | tt_buff, tt_buff_len); | |
c6c8fea2 | 109 | |
e1a5382f | 110 | /* route changed */ |
c6c8fea2 SE |
111 | } else { |
112 | bat_dbg(DBG_ROUTES, bat_priv, | |
113 | "Changing route towards: %pM " | |
114 | "(now via %pM - was via %pM)\n", | |
115 | orig_node->orig, neigh_node->addr, | |
e1a5382f | 116 | curr_router->addr); |
c6c8fea2 SE |
117 | } |
118 | ||
e1a5382f LL |
119 | if (curr_router) |
120 | neigh_node_free_ref(curr_router); | |
121 | ||
122 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
123 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
124 | neigh_node = NULL; | |
e1a5382f LL |
125 | |
126 | spin_lock_bh(&orig_node->neigh_list_lock); | |
127 | rcu_assign_pointer(orig_node->router, neigh_node); | |
128 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
129 | ||
130 | /* decrease refcount of previous best neighbor */ | |
131 | if (curr_router) | |
132 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
133 | } |
134 | ||
c6c8fea2 | 135 | void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, |
747e4221 | 136 | struct neigh_node *neigh_node, const unsigned char *tt_buff, |
2dafb49d | 137 | int tt_buff_len) |
c6c8fea2 | 138 | { |
e1a5382f | 139 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
140 | |
141 | if (!orig_node) | |
e1a5382f LL |
142 | goto out; |
143 | ||
144 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 145 | |
e1a5382f | 146 | if (router != neigh_node) |
c6c8fea2 | 147 | update_route(bat_priv, orig_node, neigh_node, |
2dafb49d AQ |
148 | tt_buff, tt_buff_len); |
149 | /* may be just TT changed */ | |
c6c8fea2 | 150 | else |
2dafb49d | 151 | update_TT(bat_priv, orig_node, tt_buff, tt_buff_len); |
e1a5382f LL |
152 | |
153 | out: | |
154 | if (router) | |
155 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
156 | } |
157 | ||
158 | static int is_bidirectional_neigh(struct orig_node *orig_node, | |
159 | struct orig_node *orig_neigh_node, | |
160 | struct batman_packet *batman_packet, | |
e6c10f43 | 161 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
162 | { |
163 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
1605d0d6 | 164 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node; |
9591a79f | 165 | struct hlist_node *node; |
c6c8fea2 | 166 | unsigned char total_count; |
0ede9f41 ML |
167 | uint8_t orig_eq_count, neigh_rq_count, tq_own; |
168 | int tq_asym_penalty, ret = 0; | |
c6c8fea2 | 169 | |
27aea212 DF |
170 | /* find corresponding one hop neighbor */ |
171 | rcu_read_lock(); | |
172 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
173 | &orig_neigh_node->neigh_list, list) { | |
1605d0d6 | 174 | |
27aea212 DF |
175 | if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig)) |
176 | continue; | |
c6c8fea2 | 177 | |
27aea212 DF |
178 | if (tmp_neigh_node->if_incoming != if_incoming) |
179 | continue; | |
c6c8fea2 | 180 | |
27aea212 DF |
181 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
182 | continue; | |
1605d0d6 | 183 | |
27aea212 DF |
184 | neigh_node = tmp_neigh_node; |
185 | break; | |
186 | } | |
187 | rcu_read_unlock(); | |
1605d0d6 | 188 | |
27aea212 DF |
189 | if (!neigh_node) |
190 | neigh_node = create_neighbor(orig_neigh_node, | |
191 | orig_neigh_node, | |
192 | orig_neigh_node->orig, | |
193 | if_incoming); | |
1605d0d6 | 194 | |
27aea212 DF |
195 | if (!neigh_node) |
196 | goto out; | |
c6c8fea2 | 197 | |
27aea212 DF |
198 | /* if orig_node is direct neighbour update neigh_node last_valid */ |
199 | if (orig_node == orig_neigh_node) | |
200 | neigh_node->last_valid = jiffies; | |
c6c8fea2 SE |
201 | |
202 | orig_node->last_valid = jiffies; | |
203 | ||
27aea212 | 204 | /* find packet count of corresponding one hop neighbor */ |
0ede9f41 ML |
205 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
206 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
207 | neigh_rq_count = neigh_node->real_packet_count; | |
208 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
209 | ||
c6c8fea2 | 210 | /* pay attention to not get a value bigger than 100 % */ |
0ede9f41 ML |
211 | total_count = (orig_eq_count > neigh_rq_count ? |
212 | neigh_rq_count : orig_eq_count); | |
c6c8fea2 SE |
213 | |
214 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
215 | /* if we receive too few packets it is not considered bidirectional */ | |
216 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
0ede9f41 ML |
217 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
218 | tq_own = 0; | |
c6c8fea2 SE |
219 | else |
220 | /* neigh_node->real_packet_count is never zero as we | |
221 | * only purge old information when getting new | |
222 | * information */ | |
0ede9f41 | 223 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
c6c8fea2 SE |
224 | |
225 | /* | |
226 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does | |
227 | * affect the nearly-symmetric links only a little, but | |
228 | * punishes asymmetric links more. This will give a value | |
229 | * between 0 and TQ_MAX_VALUE | |
230 | */ | |
0ede9f41 ML |
231 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
232 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
233 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
234 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
235 | (TQ_LOCAL_WINDOW_SIZE * | |
236 | TQ_LOCAL_WINDOW_SIZE * | |
237 | TQ_LOCAL_WINDOW_SIZE); | |
238 | ||
239 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / | |
240 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
c6c8fea2 SE |
241 | |
242 | bat_dbg(DBG_BATMAN, bat_priv, | |
243 | "bidirectional: " | |
244 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
245 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
246 | "total tq: %3i\n", | |
247 | orig_node->orig, orig_neigh_node->orig, total_count, | |
0ede9f41 | 248 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
c6c8fea2 SE |
249 | |
250 | /* if link has the minimum required transmission quality | |
251 | * consider it bidirectional */ | |
252 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
a775eb84 ML |
253 | ret = 1; |
254 | ||
a775eb84 ML |
255 | out: |
256 | if (neigh_node) | |
44524fcd | 257 | neigh_node_free_ref(neigh_node); |
a775eb84 | 258 | return ret; |
c6c8fea2 SE |
259 | } |
260 | ||
a4c135c5 SW |
261 | /* caller must hold the neigh_list_lock */ |
262 | void bonding_candidate_del(struct orig_node *orig_node, | |
263 | struct neigh_node *neigh_node) | |
264 | { | |
265 | /* this neighbor is not part of our candidate list */ | |
266 | if (list_empty(&neigh_node->bonding_list)) | |
267 | goto out; | |
268 | ||
269 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 270 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 271 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
272 | atomic_dec(&orig_node->bond_candidates); |
273 | ||
274 | out: | |
275 | return; | |
276 | } | |
277 | ||
278 | static void bonding_candidate_add(struct orig_node *orig_node, | |
279 | struct neigh_node *neigh_node) | |
280 | { | |
281 | struct hlist_node *node; | |
e1a5382f LL |
282 | struct neigh_node *tmp_neigh_node, *router = NULL; |
283 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
284 | |
285 | spin_lock_bh(&orig_node->neigh_list_lock); | |
286 | ||
287 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
288 | if (!compare_eth(orig_node->orig, |
289 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
290 | goto candidate_del; |
291 | ||
e1a5382f LL |
292 | router = orig_node_get_router(orig_node); |
293 | if (!router) | |
a4c135c5 SW |
294 | goto candidate_del; |
295 | ||
a4c135c5 | 296 | /* ... and is good enough to be considered */ |
e1a5382f | 297 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
298 | goto candidate_del; |
299 | ||
300 | /** | |
301 | * check if we have another candidate with the same mac address or | |
302 | * interface. If we do, we won't select this candidate because of | |
303 | * possible interference. | |
304 | */ | |
305 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
306 | &orig_node->neigh_list, list) { | |
307 | ||
308 | if (tmp_neigh_node == neigh_node) | |
309 | continue; | |
310 | ||
311 | /* we only care if the other candidate is even | |
312 | * considered as candidate. */ | |
313 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
314 | continue; | |
315 | ||
316 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 317 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
318 | interference_candidate = 1; |
319 | break; | |
320 | } | |
321 | } | |
322 | ||
323 | /* don't care further if it is an interference candidate */ | |
324 | if (interference_candidate) | |
325 | goto candidate_del; | |
326 | ||
327 | /* this neighbor already is part of our candidate list */ | |
328 | if (!list_empty(&neigh_node->bonding_list)) | |
329 | goto out; | |
330 | ||
44524fcd ML |
331 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
332 | goto out; | |
333 | ||
a4c135c5 | 334 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
335 | atomic_inc(&orig_node->bond_candidates); |
336 | goto out; | |
337 | ||
338 | candidate_del: | |
339 | bonding_candidate_del(orig_node, neigh_node); | |
340 | ||
341 | out: | |
342 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
343 | |
344 | if (router) | |
345 | neigh_node_free_ref(router); | |
a4c135c5 SW |
346 | } |
347 | ||
348 | /* copy primary address for bonding */ | |
747e4221 | 349 | static void bonding_save_primary(const struct orig_node *orig_node, |
a4c135c5 | 350 | struct orig_node *orig_neigh_node, |
747e4221 | 351 | const struct batman_packet *batman_packet) |
a4c135c5 SW |
352 | { |
353 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) | |
354 | return; | |
355 | ||
356 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
357 | } | |
358 | ||
747e4221 SE |
359 | static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, |
360 | const struct ethhdr *ethhdr, | |
361 | const struct batman_packet *batman_packet, | |
e6c10f43 | 362 | struct hard_iface *if_incoming, |
747e4221 | 363 | const unsigned char *tt_buff, int tt_buff_len, |
c6c8fea2 SE |
364 | char is_duplicate) |
365 | { | |
366 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
e1a5382f | 367 | struct neigh_node *router = NULL; |
2ae2daf6 | 368 | struct orig_node *orig_node_tmp; |
9591a79f | 369 | struct hlist_node *node; |
2dafb49d | 370 | int tmp_tt_buff_len; |
2ae2daf6 | 371 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
c6c8fea2 SE |
372 | |
373 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " | |
374 | "Searching and updating originator entry of received packet\n"); | |
375 | ||
f987ed6e ML |
376 | rcu_read_lock(); |
377 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
378 | &orig_node->neigh_list, list) { | |
39901e71 | 379 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
44524fcd ML |
380 | (tmp_neigh_node->if_incoming == if_incoming) && |
381 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
382 | if (neigh_node) | |
383 | neigh_node_free_ref(neigh_node); | |
c6c8fea2 SE |
384 | neigh_node = tmp_neigh_node; |
385 | continue; | |
386 | } | |
387 | ||
388 | if (is_duplicate) | |
389 | continue; | |
390 | ||
68003903 | 391 | spin_lock_bh(&tmp_neigh_node->tq_lock); |
c6c8fea2 SE |
392 | ring_buffer_set(tmp_neigh_node->tq_recv, |
393 | &tmp_neigh_node->tq_index, 0); | |
394 | tmp_neigh_node->tq_avg = | |
395 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
68003903 | 396 | spin_unlock_bh(&tmp_neigh_node->tq_lock); |
c6c8fea2 SE |
397 | } |
398 | ||
399 | if (!neigh_node) { | |
400 | struct orig_node *orig_tmp; | |
401 | ||
402 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
403 | if (!orig_tmp) | |
a775eb84 | 404 | goto unlock; |
c6c8fea2 SE |
405 | |
406 | neigh_node = create_neighbor(orig_node, orig_tmp, | |
407 | ethhdr->h_source, if_incoming); | |
16b1aba8 | 408 | |
7b36e8ee | 409 | orig_node_free_ref(orig_tmp); |
c6c8fea2 | 410 | if (!neigh_node) |
a775eb84 | 411 | goto unlock; |
c6c8fea2 SE |
412 | } else |
413 | bat_dbg(DBG_BATMAN, bat_priv, | |
414 | "Updating existing last-hop neighbor of originator\n"); | |
415 | ||
a775eb84 ML |
416 | rcu_read_unlock(); |
417 | ||
c6c8fea2 SE |
418 | orig_node->flags = batman_packet->flags; |
419 | neigh_node->last_valid = jiffies; | |
420 | ||
68003903 | 421 | spin_lock_bh(&neigh_node->tq_lock); |
c6c8fea2 SE |
422 | ring_buffer_set(neigh_node->tq_recv, |
423 | &neigh_node->tq_index, | |
424 | batman_packet->tq); | |
425 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
68003903 | 426 | spin_unlock_bh(&neigh_node->tq_lock); |
c6c8fea2 SE |
427 | |
428 | if (!is_duplicate) { | |
429 | orig_node->last_ttl = batman_packet->ttl; | |
430 | neigh_node->last_ttl = batman_packet->ttl; | |
431 | } | |
432 | ||
a4c135c5 SW |
433 | bonding_candidate_add(orig_node, neigh_node); |
434 | ||
2dafb49d AQ |
435 | tmp_tt_buff_len = (tt_buff_len > batman_packet->num_tt * ETH_ALEN ? |
436 | batman_packet->num_tt * ETH_ALEN : tt_buff_len); | |
c6c8fea2 SE |
437 | |
438 | /* if this neighbor already is our next hop there is nothing | |
439 | * to change */ | |
e1a5382f LL |
440 | router = orig_node_get_router(orig_node); |
441 | if (router == neigh_node) | |
2dafb49d | 442 | goto update_tt; |
c6c8fea2 SE |
443 | |
444 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
e1a5382f | 445 | if (router && (router->tq_avg > neigh_node->tq_avg)) |
2dafb49d | 446 | goto update_tt; |
c6c8fea2 SE |
447 | |
448 | /* if the TQ is the same and the link not more symetric we | |
449 | * won't consider it either */ | |
e1a5382f LL |
450 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
451 | orig_node_tmp = router->orig_node; | |
2ae2daf6 ML |
452 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
453 | bcast_own_sum_orig = | |
454 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
455 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
456 | ||
457 | orig_node_tmp = neigh_node->orig_node; | |
458 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
459 | bcast_own_sum_neigh = | |
460 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
461 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
462 | ||
463 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
2dafb49d | 464 | goto update_tt; |
2ae2daf6 | 465 | } |
c6c8fea2 SE |
466 | |
467 | update_routes(bat_priv, orig_node, neigh_node, | |
2dafb49d | 468 | tt_buff, tmp_tt_buff_len); |
c6c8fea2 SE |
469 | goto update_gw; |
470 | ||
2dafb49d | 471 | update_tt: |
e1a5382f | 472 | update_routes(bat_priv, orig_node, router, |
2dafb49d | 473 | tt_buff, tmp_tt_buff_len); |
c6c8fea2 SE |
474 | |
475 | update_gw: | |
476 | if (orig_node->gw_flags != batman_packet->gw_flags) | |
477 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); | |
478 | ||
479 | orig_node->gw_flags = batman_packet->gw_flags; | |
480 | ||
481 | /* restart gateway selection if fast or late switching was enabled */ | |
482 | if ((orig_node->gw_flags) && | |
483 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
484 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
485 | gw_check_election(bat_priv, orig_node); | |
a775eb84 ML |
486 | |
487 | goto out; | |
488 | ||
489 | unlock: | |
490 | rcu_read_unlock(); | |
491 | out: | |
492 | if (neigh_node) | |
44524fcd | 493 | neigh_node_free_ref(neigh_node); |
e1a5382f LL |
494 | if (router) |
495 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
496 | } |
497 | ||
498 | /* checks whether the host restarted and is in the protection time. | |
499 | * returns: | |
500 | * 0 if the packet is to be accepted | |
501 | * 1 if the packet is to be ignored. | |
502 | */ | |
503 | static int window_protected(struct bat_priv *bat_priv, | |
504 | int32_t seq_num_diff, | |
505 | unsigned long *last_reset) | |
506 | { | |
507 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) | |
508 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
509 | if (time_after(jiffies, *last_reset + | |
510 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
511 | ||
512 | *last_reset = jiffies; | |
513 | bat_dbg(DBG_BATMAN, bat_priv, | |
514 | "old packet received, start protection\n"); | |
515 | ||
516 | return 0; | |
517 | } else | |
518 | return 1; | |
519 | } | |
520 | return 0; | |
521 | } | |
522 | ||
523 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
524 | * finds out whether it is a duplicate. | |
525 | * returns: | |
526 | * 1 the packet is a duplicate | |
527 | * 0 the packet has not yet been received | |
528 | * -1 the packet is old and has been received while the seqno window | |
529 | * was protected. Caller should drop it. | |
530 | */ | |
747e4221 SE |
531 | static char count_real_packets(const struct ethhdr *ethhdr, |
532 | const struct batman_packet *batman_packet, | |
533 | const struct hard_iface *if_incoming) | |
c6c8fea2 SE |
534 | { |
535 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
536 | struct orig_node *orig_node; | |
537 | struct neigh_node *tmp_neigh_node; | |
9591a79f | 538 | struct hlist_node *node; |
c6c8fea2 SE |
539 | char is_duplicate = 0; |
540 | int32_t seq_diff; | |
541 | int need_update = 0; | |
0ede9f41 | 542 | int set_mark, ret = -1; |
c6c8fea2 SE |
543 | |
544 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
545 | if (!orig_node) | |
546 | return 0; | |
547 | ||
0ede9f41 | 548 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 SE |
549 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
550 | ||
551 | /* signalize caller that the packet is to be dropped. */ | |
552 | if (window_protected(bat_priv, seq_diff, | |
553 | &orig_node->batman_seqno_reset)) | |
0ede9f41 | 554 | goto out; |
c6c8fea2 | 555 | |
f987ed6e ML |
556 | rcu_read_lock(); |
557 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
558 | &orig_node->neigh_list, list) { | |
c6c8fea2 SE |
559 | |
560 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, | |
561 | orig_node->last_real_seqno, | |
562 | batman_packet->seqno); | |
563 | ||
39901e71 | 564 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
c6c8fea2 SE |
565 | (tmp_neigh_node->if_incoming == if_incoming)) |
566 | set_mark = 1; | |
567 | else | |
568 | set_mark = 0; | |
569 | ||
570 | /* if the window moved, set the update flag. */ | |
571 | need_update |= bit_get_packet(bat_priv, | |
572 | tmp_neigh_node->real_bits, | |
573 | seq_diff, set_mark); | |
574 | ||
575 | tmp_neigh_node->real_packet_count = | |
576 | bit_packet_count(tmp_neigh_node->real_bits); | |
577 | } | |
f987ed6e | 578 | rcu_read_unlock(); |
c6c8fea2 SE |
579 | |
580 | if (need_update) { | |
581 | bat_dbg(DBG_BATMAN, bat_priv, | |
582 | "updating last_seqno: old %d, new %d\n", | |
583 | orig_node->last_real_seqno, batman_packet->seqno); | |
584 | orig_node->last_real_seqno = batman_packet->seqno; | |
585 | } | |
586 | ||
0ede9f41 | 587 | ret = is_duplicate; |
16b1aba8 | 588 | |
0ede9f41 ML |
589 | out: |
590 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7b36e8ee | 591 | orig_node_free_ref(orig_node); |
0ede9f41 | 592 | return ret; |
c6c8fea2 SE |
593 | } |
594 | ||
747e4221 | 595 | void receive_bat_packet(const struct ethhdr *ethhdr, |
a4c135c5 | 596 | struct batman_packet *batman_packet, |
747e4221 | 597 | const unsigned char *tt_buff, int tt_buff_len, |
e6c10f43 | 598 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
599 | { |
600 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
e6c10f43 | 601 | struct hard_iface *hard_iface; |
c6c8fea2 | 602 | struct orig_node *orig_neigh_node, *orig_node; |
e1a5382f LL |
603 | struct neigh_node *router = NULL, *router_router = NULL; |
604 | struct neigh_node *orig_neigh_router = NULL; | |
c6c8fea2 SE |
605 | char has_directlink_flag; |
606 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
607 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
608 | char is_duplicate; | |
609 | uint32_t if_incoming_seqno; | |
610 | ||
611 | /* Silently drop when the batman packet is actually not a | |
612 | * correct packet. | |
613 | * | |
614 | * This might happen if a packet is padded (e.g. Ethernet has a | |
615 | * minimum frame length of 64 byte) and the aggregation interprets | |
616 | * it as an additional length. | |
617 | * | |
618 | * TODO: A more sane solution would be to have a bit in the | |
619 | * batman_packet to detect whether the packet is the last | |
620 | * packet in an aggregation. Here we expect that the padding | |
621 | * is always zero (or not 0x01) | |
622 | */ | |
623 | if (batman_packet->packet_type != BAT_PACKET) | |
624 | return; | |
625 | ||
626 | /* could be changed by schedule_own_packet() */ | |
627 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
628 | ||
629 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); | |
630 | ||
39901e71 ML |
631 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
632 | batman_packet->orig) ? 1 : 0); | |
c6c8fea2 SE |
633 | |
634 | bat_dbg(DBG_BATMAN, bat_priv, | |
635 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " | |
636 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " | |
637 | "TTL %d, V %d, IDF %d)\n", | |
638 | ethhdr->h_source, if_incoming->net_dev->name, | |
639 | if_incoming->net_dev->dev_addr, batman_packet->orig, | |
640 | batman_packet->prev_sender, batman_packet->seqno, | |
641 | batman_packet->tq, batman_packet->ttl, batman_packet->version, | |
642 | has_directlink_flag); | |
643 | ||
644 | rcu_read_lock(); | |
e6c10f43 ML |
645 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
646 | if (hard_iface->if_status != IF_ACTIVE) | |
c6c8fea2 SE |
647 | continue; |
648 | ||
e6c10f43 | 649 | if (hard_iface->soft_iface != if_incoming->soft_iface) |
c6c8fea2 SE |
650 | continue; |
651 | ||
39901e71 | 652 | if (compare_eth(ethhdr->h_source, |
e6c10f43 | 653 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
654 | is_my_addr = 1; |
655 | ||
39901e71 | 656 | if (compare_eth(batman_packet->orig, |
e6c10f43 | 657 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
658 | is_my_orig = 1; |
659 | ||
39901e71 | 660 | if (compare_eth(batman_packet->prev_sender, |
e6c10f43 | 661 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
662 | is_my_oldorig = 1; |
663 | ||
39901e71 | 664 | if (compare_eth(ethhdr->h_source, broadcast_addr)) |
c6c8fea2 SE |
665 | is_broadcast = 1; |
666 | } | |
667 | rcu_read_unlock(); | |
668 | ||
669 | if (batman_packet->version != COMPAT_VERSION) { | |
670 | bat_dbg(DBG_BATMAN, bat_priv, | |
671 | "Drop packet: incompatible batman version (%i)\n", | |
672 | batman_packet->version); | |
673 | return; | |
674 | } | |
675 | ||
676 | if (is_my_addr) { | |
677 | bat_dbg(DBG_BATMAN, bat_priv, | |
678 | "Drop packet: received my own broadcast (sender: %pM" | |
679 | ")\n", | |
680 | ethhdr->h_source); | |
681 | return; | |
682 | } | |
683 | ||
684 | if (is_broadcast) { | |
685 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
686 | "ignoring all packets with broadcast source addr (sender: %pM" | |
687 | ")\n", ethhdr->h_source); | |
688 | return; | |
689 | } | |
690 | ||
691 | if (is_my_orig) { | |
692 | unsigned long *word; | |
693 | int offset; | |
694 | ||
695 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
c6c8fea2 SE |
696 | if (!orig_neigh_node) |
697 | return; | |
698 | ||
699 | /* neighbor has to indicate direct link and it has to | |
700 | * come via the corresponding interface */ | |
701 | /* if received seqno equals last send seqno save new | |
702 | * seqno for bidirectional check */ | |
703 | if (has_directlink_flag && | |
39901e71 ML |
704 | compare_eth(if_incoming->net_dev->dev_addr, |
705 | batman_packet->orig) && | |
c6c8fea2 SE |
706 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
707 | offset = if_incoming->if_num * NUM_WORDS; | |
2ae2daf6 ML |
708 | |
709 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
c6c8fea2 SE |
710 | word = &(orig_neigh_node->bcast_own[offset]); |
711 | bit_mark(word, 0); | |
712 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
713 | bit_packet_count(word); | |
2ae2daf6 | 714 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
c6c8fea2 SE |
715 | } |
716 | ||
717 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
718 | "originator packet from myself (via neighbor)\n"); | |
7b36e8ee | 719 | orig_node_free_ref(orig_neigh_node); |
c6c8fea2 SE |
720 | return; |
721 | } | |
722 | ||
723 | if (is_my_oldorig) { | |
724 | bat_dbg(DBG_BATMAN, bat_priv, | |
725 | "Drop packet: ignoring all rebroadcast echos (sender: " | |
726 | "%pM)\n", ethhdr->h_source); | |
727 | return; | |
728 | } | |
729 | ||
730 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
731 | if (!orig_node) | |
732 | return; | |
733 | ||
734 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
735 | ||
736 | if (is_duplicate == -1) { | |
737 | bat_dbg(DBG_BATMAN, bat_priv, | |
738 | "Drop packet: packet within seqno protection time " | |
739 | "(sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 740 | goto out; |
c6c8fea2 SE |
741 | } |
742 | ||
743 | if (batman_packet->tq == 0) { | |
744 | bat_dbg(DBG_BATMAN, bat_priv, | |
745 | "Drop packet: originator packet with tq equal 0\n"); | |
16b1aba8 | 746 | goto out; |
c6c8fea2 SE |
747 | } |
748 | ||
e1a5382f LL |
749 | router = orig_node_get_router(orig_node); |
750 | if (router) | |
751 | router_router = orig_node_get_router(router->orig_node); | |
752 | ||
c6c8fea2 | 753 | /* avoid temporary routing loops */ |
e1a5382f LL |
754 | if (router && router_router && |
755 | (compare_eth(router->addr, batman_packet->prev_sender)) && | |
39901e71 | 756 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && |
e1a5382f | 757 | (compare_eth(router->addr, router_router->addr))) { |
c6c8fea2 SE |
758 | bat_dbg(DBG_BATMAN, bat_priv, |
759 | "Drop packet: ignoring all rebroadcast packets that " | |
760 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 761 | goto out; |
c6c8fea2 SE |
762 | } |
763 | ||
764 | /* if sender is a direct neighbor the sender mac equals | |
765 | * originator mac */ | |
766 | orig_neigh_node = (is_single_hop_neigh ? | |
767 | orig_node : | |
768 | get_orig_node(bat_priv, ethhdr->h_source)); | |
769 | if (!orig_neigh_node) | |
d0072609 | 770 | goto out; |
c6c8fea2 | 771 | |
e1a5382f LL |
772 | orig_neigh_router = orig_node_get_router(orig_neigh_node); |
773 | ||
c6c8fea2 SE |
774 | /* drop packet if sender is not a direct neighbor and if we |
775 | * don't route towards it */ | |
e1a5382f | 776 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
c6c8fea2 SE |
777 | bat_dbg(DBG_BATMAN, bat_priv, |
778 | "Drop packet: OGM via unknown neighbor!\n"); | |
16b1aba8 | 779 | goto out_neigh; |
c6c8fea2 SE |
780 | } |
781 | ||
782 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, | |
783 | batman_packet, if_incoming); | |
784 | ||
a4c135c5 SW |
785 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
786 | ||
c6c8fea2 SE |
787 | /* update ranking if it is not a duplicate or has the same |
788 | * seqno and similar ttl as the non-duplicate */ | |
789 | if (is_bidirectional && | |
790 | (!is_duplicate || | |
791 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
792 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
793 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, | |
2dafb49d | 794 | if_incoming, tt_buff, tt_buff_len, is_duplicate); |
c6c8fea2 | 795 | |
c6c8fea2 SE |
796 | /* is single hop (direct) neighbor */ |
797 | if (is_single_hop_neigh) { | |
798 | ||
799 | /* mark direct link on incoming interface */ | |
800 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
2dafb49d | 801 | 1, tt_buff_len, if_incoming); |
c6c8fea2 SE |
802 | |
803 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " | |
804 | "rebroadcast neighbor packet with direct link flag\n"); | |
16b1aba8 | 805 | goto out_neigh; |
c6c8fea2 SE |
806 | } |
807 | ||
808 | /* multihop originator */ | |
809 | if (!is_bidirectional) { | |
810 | bat_dbg(DBG_BATMAN, bat_priv, | |
811 | "Drop packet: not received via bidirectional link\n"); | |
16b1aba8 | 812 | goto out_neigh; |
c6c8fea2 SE |
813 | } |
814 | ||
815 | if (is_duplicate) { | |
816 | bat_dbg(DBG_BATMAN, bat_priv, | |
817 | "Drop packet: duplicate packet received\n"); | |
16b1aba8 | 818 | goto out_neigh; |
c6c8fea2 SE |
819 | } |
820 | ||
821 | bat_dbg(DBG_BATMAN, bat_priv, | |
822 | "Forwarding packet: rebroadcast originator packet\n"); | |
823 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
2dafb49d | 824 | 0, tt_buff_len, if_incoming); |
16b1aba8 ML |
825 | |
826 | out_neigh: | |
7b36e8ee ML |
827 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
828 | orig_node_free_ref(orig_neigh_node); | |
16b1aba8 | 829 | out: |
e1a5382f LL |
830 | if (router) |
831 | neigh_node_free_ref(router); | |
832 | if (router_router) | |
833 | neigh_node_free_ref(router_router); | |
834 | if (orig_neigh_router) | |
835 | neigh_node_free_ref(orig_neigh_router); | |
836 | ||
7b36e8ee | 837 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
838 | } |
839 | ||
e6c10f43 | 840 | int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 841 | { |
c6c8fea2 SE |
842 | struct ethhdr *ethhdr; |
843 | ||
844 | /* drop packet if it has not necessary minimum size */ | |
845 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) | |
846 | return NET_RX_DROP; | |
847 | ||
848 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
849 | ||
850 | /* packet with broadcast indication but unicast recipient */ | |
851 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
852 | return NET_RX_DROP; | |
853 | ||
854 | /* packet with broadcast sender address */ | |
855 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
856 | return NET_RX_DROP; | |
857 | ||
858 | /* create a copy of the skb, if needed, to modify it. */ | |
859 | if (skb_cow(skb, 0) < 0) | |
860 | return NET_RX_DROP; | |
861 | ||
862 | /* keep skb linear */ | |
863 | if (skb_linearize(skb) < 0) | |
864 | return NET_RX_DROP; | |
865 | ||
866 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
867 | ||
c6c8fea2 SE |
868 | receive_aggr_bat_packet(ethhdr, |
869 | skb->data, | |
870 | skb_headlen(skb), | |
e6c10f43 | 871 | hard_iface); |
c6c8fea2 SE |
872 | |
873 | kfree_skb(skb); | |
874 | return NET_RX_SUCCESS; | |
875 | } | |
876 | ||
877 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
878 | struct sk_buff *skb, size_t icmp_len) | |
879 | { | |
32ae9b22 | 880 | struct hard_iface *primary_if = NULL; |
44524fcd | 881 | struct orig_node *orig_node = NULL; |
e1a5382f | 882 | struct neigh_node *router = NULL; |
c6c8fea2 | 883 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 884 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
885 | |
886 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
887 | |
888 | /* add data to device queue */ | |
889 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
890 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 891 | goto out; |
c6c8fea2 SE |
892 | } |
893 | ||
32ae9b22 ML |
894 | primary_if = primary_if_get_selected(bat_priv); |
895 | if (!primary_if) | |
44524fcd | 896 | goto out; |
c6c8fea2 SE |
897 | |
898 | /* answer echo request (ping) */ | |
899 | /* get routing information */ | |
7aadf889 | 900 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 901 | if (!orig_node) |
e1a5382f | 902 | goto out; |
c6c8fea2 | 903 | |
e1a5382f LL |
904 | router = orig_node_get_router(orig_node); |
905 | if (!router) | |
906 | goto out; | |
c6c8fea2 | 907 | |
44524fcd ML |
908 | /* create a copy of the skb, if needed, to modify it. */ |
909 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
910 | goto out; | |
911 | ||
912 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
913 | ||
914 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 915 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd ML |
916 | icmp_packet->msg_type = ECHO_REPLY; |
917 | icmp_packet->ttl = TTL; | |
918 | ||
e1a5382f | 919 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 920 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 921 | |
44524fcd | 922 | out: |
32ae9b22 ML |
923 | if (primary_if) |
924 | hardif_free_ref(primary_if); | |
e1a5382f LL |
925 | if (router) |
926 | neigh_node_free_ref(router); | |
44524fcd | 927 | if (orig_node) |
7b36e8ee | 928 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
929 | return ret; |
930 | } | |
931 | ||
932 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 933 | struct sk_buff *skb) |
c6c8fea2 | 934 | { |
32ae9b22 | 935 | struct hard_iface *primary_if = NULL; |
44524fcd | 936 | struct orig_node *orig_node = NULL; |
e1a5382f | 937 | struct neigh_node *router = NULL; |
c6c8fea2 | 938 | struct icmp_packet *icmp_packet; |
44524fcd | 939 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
940 | |
941 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
942 | |
943 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
944 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
945 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
946 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
947 | icmp_packet->dst); | |
44524fcd | 948 | goto out; |
c6c8fea2 SE |
949 | } |
950 | ||
32ae9b22 ML |
951 | primary_if = primary_if_get_selected(bat_priv); |
952 | if (!primary_if) | |
44524fcd | 953 | goto out; |
c6c8fea2 SE |
954 | |
955 | /* get routing information */ | |
7aadf889 | 956 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 957 | if (!orig_node) |
e1a5382f | 958 | goto out; |
c6c8fea2 | 959 | |
e1a5382f LL |
960 | router = orig_node_get_router(orig_node); |
961 | if (!router) | |
962 | goto out; | |
c6c8fea2 | 963 | |
44524fcd ML |
964 | /* create a copy of the skb, if needed, to modify it. */ |
965 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
966 | goto out; | |
c6c8fea2 | 967 | |
44524fcd | 968 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 969 | |
44524fcd | 970 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 971 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd ML |
972 | icmp_packet->msg_type = TTL_EXCEEDED; |
973 | icmp_packet->ttl = TTL; | |
974 | ||
e1a5382f | 975 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 976 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 977 | |
44524fcd | 978 | out: |
32ae9b22 ML |
979 | if (primary_if) |
980 | hardif_free_ref(primary_if); | |
e1a5382f LL |
981 | if (router) |
982 | neigh_node_free_ref(router); | |
44524fcd | 983 | if (orig_node) |
7b36e8ee | 984 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
985 | return ret; |
986 | } | |
987 | ||
988 | ||
e6c10f43 | 989 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
990 | { |
991 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
992 | struct icmp_packet_rr *icmp_packet; | |
993 | struct ethhdr *ethhdr; | |
44524fcd | 994 | struct orig_node *orig_node = NULL; |
e1a5382f | 995 | struct neigh_node *router = NULL; |
c6c8fea2 | 996 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 997 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
998 | |
999 | /** | |
1000 | * we truncate all incoming icmp packets if they don't match our size | |
1001 | */ | |
1002 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
1003 | hdr_size = sizeof(struct icmp_packet_rr); | |
1004 | ||
1005 | /* drop packet if it has not necessary minimum size */ | |
1006 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 1007 | goto out; |
c6c8fea2 SE |
1008 | |
1009 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1010 | ||
1011 | /* packet with unicast indication but broadcast recipient */ | |
1012 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 1013 | goto out; |
c6c8fea2 SE |
1014 | |
1015 | /* packet with broadcast sender address */ | |
1016 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 1017 | goto out; |
c6c8fea2 SE |
1018 | |
1019 | /* not for me */ | |
1020 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 1021 | goto out; |
c6c8fea2 SE |
1022 | |
1023 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
1024 | ||
1025 | /* add record route information if not full */ | |
1026 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
1027 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
1028 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
1029 | ethhdr->h_dest, ETH_ALEN); | |
1030 | icmp_packet->rr_cur++; | |
1031 | } | |
1032 | ||
1033 | /* packet for me */ | |
1034 | if (is_my_mac(icmp_packet->dst)) | |
1035 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
1036 | ||
1037 | /* TTL exceeded */ | |
1038 | if (icmp_packet->ttl < 2) | |
74ef1153 | 1039 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 1040 | |
c6c8fea2 | 1041 | /* get routing information */ |
7aadf889 | 1042 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 1043 | if (!orig_node) |
e1a5382f | 1044 | goto out; |
c6c8fea2 | 1045 | |
e1a5382f LL |
1046 | router = orig_node_get_router(orig_node); |
1047 | if (!router) | |
1048 | goto out; | |
c6c8fea2 | 1049 | |
44524fcd ML |
1050 | /* create a copy of the skb, if needed, to modify it. */ |
1051 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1052 | goto out; | |
c6c8fea2 | 1053 | |
44524fcd | 1054 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 1055 | |
44524fcd ML |
1056 | /* decrement ttl */ |
1057 | icmp_packet->ttl--; | |
1058 | ||
1059 | /* route it */ | |
e1a5382f | 1060 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 1061 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 1062 | |
44524fcd | 1063 | out: |
e1a5382f LL |
1064 | if (router) |
1065 | neigh_node_free_ref(router); | |
44524fcd | 1066 | if (orig_node) |
7b36e8ee | 1067 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1068 | return ret; |
1069 | } | |
1070 | ||
55158629 LL |
1071 | /* In the bonding case, send the packets in a round |
1072 | * robin fashion over the remaining interfaces. | |
1073 | * | |
1074 | * This method rotates the bonding list and increases the | |
1075 | * returned router's refcount. */ | |
1076 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
747e4221 | 1077 | const struct hard_iface *recv_if) |
55158629 LL |
1078 | { |
1079 | struct neigh_node *tmp_neigh_node; | |
1080 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1081 | ||
1082 | rcu_read_lock(); | |
1083 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1084 | bonding_list) { | |
1085 | if (!first_candidate) | |
1086 | first_candidate = tmp_neigh_node; | |
1087 | ||
1088 | /* recv_if == NULL on the first node. */ | |
1089 | if (tmp_neigh_node->if_incoming == recv_if) | |
1090 | continue; | |
1091 | ||
1092 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1093 | continue; | |
1094 | ||
1095 | router = tmp_neigh_node; | |
1096 | break; | |
1097 | } | |
1098 | ||
1099 | /* use the first candidate if nothing was found. */ | |
1100 | if (!router && first_candidate && | |
1101 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1102 | router = first_candidate; | |
1103 | ||
1104 | if (!router) | |
1105 | goto out; | |
1106 | ||
1107 | /* selected should point to the next element | |
1108 | * after the current router */ | |
1109 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
1110 | /* this is a list_move(), which unfortunately | |
1111 | * does not exist as rcu version */ | |
1112 | list_del_rcu(&primary_orig->bond_list); | |
1113 | list_add_rcu(&primary_orig->bond_list, | |
1114 | &router->bonding_list); | |
1115 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
1116 | ||
1117 | out: | |
1118 | rcu_read_unlock(); | |
1119 | return router; | |
1120 | } | |
1121 | ||
1122 | /* Interface Alternating: Use the best of the | |
1123 | * remaining candidates which are not using | |
1124 | * this interface. | |
1125 | * | |
1126 | * Increases the returned router's refcount */ | |
1127 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
747e4221 | 1128 | const struct hard_iface *recv_if) |
55158629 LL |
1129 | { |
1130 | struct neigh_node *tmp_neigh_node; | |
1131 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1132 | ||
1133 | rcu_read_lock(); | |
1134 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1135 | bonding_list) { | |
1136 | if (!first_candidate) | |
1137 | first_candidate = tmp_neigh_node; | |
1138 | ||
1139 | /* recv_if == NULL on the first node. */ | |
1140 | if (tmp_neigh_node->if_incoming == recv_if) | |
1141 | continue; | |
1142 | ||
1143 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1144 | continue; | |
1145 | ||
1146 | /* if we don't have a router yet | |
1147 | * or this one is better, choose it. */ | |
1148 | if ((!router) || | |
1149 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
1150 | /* decrement refcount of | |
1151 | * previously selected router */ | |
1152 | if (router) | |
1153 | neigh_node_free_ref(router); | |
1154 | ||
1155 | router = tmp_neigh_node; | |
1156 | atomic_inc_not_zero(&router->refcount); | |
1157 | } | |
1158 | ||
1159 | neigh_node_free_ref(tmp_neigh_node); | |
1160 | } | |
1161 | ||
1162 | /* use the first candidate if nothing was found. */ | |
1163 | if (!router && first_candidate && | |
1164 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1165 | router = first_candidate; | |
1166 | ||
1167 | rcu_read_unlock(); | |
1168 | return router; | |
1169 | } | |
1170 | ||
c6c8fea2 | 1171 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
1172 | * bonding if possible. increases the found neighbors |
1173 | * refcount.*/ | |
c6c8fea2 SE |
1174 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
1175 | struct orig_node *orig_node, | |
747e4221 | 1176 | const struct hard_iface *recv_if) |
c6c8fea2 SE |
1177 | { |
1178 | struct orig_node *primary_orig_node; | |
1179 | struct orig_node *router_orig; | |
55158629 | 1180 | struct neigh_node *router; |
c6c8fea2 SE |
1181 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
1182 | int bonding_enabled; | |
1183 | ||
1184 | if (!orig_node) | |
1185 | return NULL; | |
1186 | ||
e1a5382f LL |
1187 | router = orig_node_get_router(orig_node); |
1188 | if (!router) | |
01df2b65 | 1189 | goto err; |
c6c8fea2 SE |
1190 | |
1191 | /* without bonding, the first node should | |
1192 | * always choose the default router. */ | |
c6c8fea2 SE |
1193 | bonding_enabled = atomic_read(&bat_priv->bonding); |
1194 | ||
a4c135c5 SW |
1195 | rcu_read_lock(); |
1196 | /* select default router to output */ | |
e1a5382f | 1197 | router_orig = router->orig_node; |
01df2b65 ML |
1198 | if (!router_orig) |
1199 | goto err_unlock; | |
a4c135c5 | 1200 | |
a4c135c5 SW |
1201 | if ((!recv_if) && (!bonding_enabled)) |
1202 | goto return_router; | |
c6c8fea2 SE |
1203 | |
1204 | /* if we have something in the primary_addr, we can search | |
1205 | * for a potential bonding candidate. */ | |
39901e71 | 1206 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 1207 | goto return_router; |
c6c8fea2 SE |
1208 | |
1209 | /* find the orig_node which has the primary interface. might | |
1210 | * even be the same as our router_orig in many cases */ | |
1211 | ||
39901e71 | 1212 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
1213 | primary_orig_node = router_orig; |
1214 | } else { | |
7aadf889 ML |
1215 | primary_orig_node = orig_hash_find(bat_priv, |
1216 | router_orig->primary_addr); | |
c6c8fea2 | 1217 | if (!primary_orig_node) |
a4c135c5 | 1218 | goto return_router; |
7aadf889 | 1219 | |
7b36e8ee | 1220 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
1221 | } |
1222 | ||
1223 | /* with less than 2 candidates, we can't do any | |
1224 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
1225 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
1226 | goto return_router; | |
c6c8fea2 | 1227 | |
c6c8fea2 SE |
1228 | /* all nodes between should choose a candidate which |
1229 | * is is not on the interface where the packet came | |
1230 | * in. */ | |
a4c135c5 | 1231 | |
44524fcd | 1232 | neigh_node_free_ref(router); |
c6c8fea2 | 1233 | |
55158629 LL |
1234 | if (bonding_enabled) |
1235 | router = find_bond_router(primary_orig_node, recv_if); | |
1236 | else | |
1237 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 1238 | |
a4c135c5 | 1239 | return_router: |
e2cbc11c AQ |
1240 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
1241 | goto err_unlock; | |
1242 | ||
a4c135c5 | 1243 | rcu_read_unlock(); |
c6c8fea2 | 1244 | return router; |
01df2b65 ML |
1245 | err_unlock: |
1246 | rcu_read_unlock(); | |
1247 | err: | |
1248 | if (router) | |
1249 | neigh_node_free_ref(router); | |
1250 | return NULL; | |
c6c8fea2 SE |
1251 | } |
1252 | ||
1253 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
1254 | { | |
1255 | struct ethhdr *ethhdr; | |
1256 | ||
1257 | /* drop packet if it has not necessary minimum size */ | |
1258 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1259 | return -1; | |
1260 | ||
1261 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1262 | ||
1263 | /* packet with unicast indication but broadcast recipient */ | |
1264 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
1265 | return -1; | |
1266 | ||
1267 | /* packet with broadcast sender address */ | |
1268 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1269 | return -1; | |
1270 | ||
1271 | /* not for me */ | |
1272 | if (!is_my_mac(ethhdr->h_dest)) | |
1273 | return -1; | |
1274 | ||
1275 | return 0; | |
1276 | } | |
1277 | ||
7cefb149 | 1278 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1279 | { |
1280 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
1281 | struct orig_node *orig_node = NULL; |
1282 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1283 | struct unicast_packet *unicast_packet; |
1284 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 1285 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1286 | struct sk_buff *new_skb; |
1287 | ||
1288 | unicast_packet = (struct unicast_packet *)skb->data; | |
1289 | ||
1290 | /* TTL exceeded */ | |
1291 | if (unicast_packet->ttl < 2) { | |
1292 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
1293 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1294 | unicast_packet->dest); | |
44524fcd | 1295 | goto out; |
c6c8fea2 SE |
1296 | } |
1297 | ||
1298 | /* get routing information */ | |
7aadf889 ML |
1299 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
1300 | ||
44524fcd | 1301 | if (!orig_node) |
b5a6f69c | 1302 | goto out; |
c6c8fea2 | 1303 | |
a4c135c5 | 1304 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 1305 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 1306 | |
d0072609 | 1307 | if (!neigh_node) |
44524fcd | 1308 | goto out; |
c6c8fea2 SE |
1309 | |
1310 | /* create a copy of the skb, if needed, to modify it. */ | |
1311 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 1312 | goto out; |
c6c8fea2 SE |
1313 | |
1314 | unicast_packet = (struct unicast_packet *)skb->data; | |
1315 | ||
1316 | if (unicast_packet->packet_type == BAT_UNICAST && | |
1317 | atomic_read(&bat_priv->fragmentation) && | |
d0072609 ML |
1318 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
1319 | ret = frag_send_skb(skb, bat_priv, | |
1320 | neigh_node->if_incoming, neigh_node->addr); | |
1321 | goto out; | |
1322 | } | |
c6c8fea2 SE |
1323 | |
1324 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
d0072609 | 1325 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
1326 | |
1327 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1328 | ||
1329 | if (ret == NET_RX_DROP) | |
44524fcd | 1330 | goto out; |
c6c8fea2 SE |
1331 | |
1332 | /* packet was buffered for late merge */ | |
44524fcd ML |
1333 | if (!new_skb) { |
1334 | ret = NET_RX_SUCCESS; | |
1335 | goto out; | |
1336 | } | |
c6c8fea2 SE |
1337 | |
1338 | skb = new_skb; | |
1339 | unicast_packet = (struct unicast_packet *)skb->data; | |
1340 | } | |
1341 | ||
1342 | /* decrement ttl */ | |
1343 | unicast_packet->ttl--; | |
1344 | ||
1345 | /* route it */ | |
d0072609 | 1346 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 1347 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 1348 | |
44524fcd ML |
1349 | out: |
1350 | if (neigh_node) | |
1351 | neigh_node_free_ref(neigh_node); | |
1352 | if (orig_node) | |
7b36e8ee | 1353 | orig_node_free_ref(orig_node); |
44524fcd | 1354 | return ret; |
c6c8fea2 SE |
1355 | } |
1356 | ||
e6c10f43 | 1357 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1358 | { |
1359 | struct unicast_packet *unicast_packet; | |
1360 | int hdr_size = sizeof(struct unicast_packet); | |
1361 | ||
1362 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1363 | return NET_RX_DROP; | |
1364 | ||
1365 | unicast_packet = (struct unicast_packet *)skb->data; | |
1366 | ||
1367 | /* packet for me */ | |
1368 | if (is_my_mac(unicast_packet->dest)) { | |
1369 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
1370 | return NET_RX_SUCCESS; | |
1371 | } | |
1372 | ||
7cefb149 | 1373 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1374 | } |
1375 | ||
e6c10f43 | 1376 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1377 | { |
1378 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1379 | struct unicast_frag_packet *unicast_packet; | |
1380 | int hdr_size = sizeof(struct unicast_frag_packet); | |
1381 | struct sk_buff *new_skb = NULL; | |
1382 | int ret; | |
1383 | ||
1384 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1385 | return NET_RX_DROP; | |
1386 | ||
1387 | unicast_packet = (struct unicast_frag_packet *)skb->data; | |
1388 | ||
1389 | /* packet for me */ | |
1390 | if (is_my_mac(unicast_packet->dest)) { | |
1391 | ||
1392 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1393 | ||
1394 | if (ret == NET_RX_DROP) | |
1395 | return NET_RX_DROP; | |
1396 | ||
1397 | /* packet was buffered for late merge */ | |
1398 | if (!new_skb) | |
1399 | return NET_RX_SUCCESS; | |
1400 | ||
1401 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1402 | sizeof(struct unicast_packet)); | |
1403 | return NET_RX_SUCCESS; | |
1404 | } | |
1405 | ||
7cefb149 | 1406 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1407 | } |
1408 | ||
1409 | ||
e6c10f43 | 1410 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1411 | { |
1412 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1413 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1414 | struct bcast_packet *bcast_packet; |
1415 | struct ethhdr *ethhdr; | |
1416 | int hdr_size = sizeof(struct bcast_packet); | |
f3e0008f | 1417 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1418 | int32_t seq_diff; |
1419 | ||
1420 | /* drop packet if it has not necessary minimum size */ | |
1421 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1422 | goto out; |
c6c8fea2 SE |
1423 | |
1424 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1425 | ||
1426 | /* packet with broadcast indication but unicast recipient */ | |
1427 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1428 | goto out; |
c6c8fea2 SE |
1429 | |
1430 | /* packet with broadcast sender address */ | |
1431 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1432 | goto out; |
c6c8fea2 SE |
1433 | |
1434 | /* ignore broadcasts sent by myself */ | |
1435 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1436 | goto out; |
c6c8fea2 SE |
1437 | |
1438 | bcast_packet = (struct bcast_packet *)skb->data; | |
1439 | ||
1440 | /* ignore broadcasts originated by myself */ | |
1441 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1442 | goto out; |
c6c8fea2 SE |
1443 | |
1444 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1445 | goto out; |
c6c8fea2 | 1446 | |
7aadf889 | 1447 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1448 | |
1449 | if (!orig_node) | |
b5a6f69c | 1450 | goto out; |
c6c8fea2 | 1451 | |
f3e0008f | 1452 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1453 | |
1454 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1455 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1456 | ntohl(bcast_packet->seqno))) | |
1457 | goto spin_unlock; | |
c6c8fea2 SE |
1458 | |
1459 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1460 | ||
1461 | /* check whether the packet is old and the host just restarted. */ | |
1462 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1463 | &orig_node->bcast_seqno_reset)) |
1464 | goto spin_unlock; | |
c6c8fea2 SE |
1465 | |
1466 | /* mark broadcast in flood history, update window position | |
1467 | * if required. */ | |
1468 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1469 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1470 | ||
f3e0008f | 1471 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1472 | |
c6c8fea2 SE |
1473 | /* rebroadcast packet */ |
1474 | add_bcast_packet_to_list(bat_priv, skb); | |
1475 | ||
1476 | /* broadcast for me */ | |
1477 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1478 | ret = NET_RX_SUCCESS; |
1479 | goto out; | |
c6c8fea2 | 1480 | |
f3e0008f ML |
1481 | spin_unlock: |
1482 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1483 | out: |
1484 | if (orig_node) | |
7b36e8ee | 1485 | orig_node_free_ref(orig_node); |
f3e0008f | 1486 | return ret; |
c6c8fea2 SE |
1487 | } |
1488 | ||
e6c10f43 | 1489 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1490 | { |
1491 | struct vis_packet *vis_packet; | |
1492 | struct ethhdr *ethhdr; | |
1493 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1494 | int hdr_size = sizeof(struct vis_packet); | |
1495 | ||
1496 | /* keep skb linear */ | |
1497 | if (skb_linearize(skb) < 0) | |
1498 | return NET_RX_DROP; | |
1499 | ||
1500 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1501 | return NET_RX_DROP; | |
1502 | ||
1503 | vis_packet = (struct vis_packet *)skb->data; | |
1504 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1505 | ||
1506 | /* not for me */ | |
1507 | if (!is_my_mac(ethhdr->h_dest)) | |
1508 | return NET_RX_DROP; | |
1509 | ||
1510 | /* ignore own packets */ | |
1511 | if (is_my_mac(vis_packet->vis_orig)) | |
1512 | return NET_RX_DROP; | |
1513 | ||
1514 | if (is_my_mac(vis_packet->sender_orig)) | |
1515 | return NET_RX_DROP; | |
1516 | ||
1517 | switch (vis_packet->vis_type) { | |
1518 | case VIS_TYPE_SERVER_SYNC: | |
1519 | receive_server_sync_packet(bat_priv, vis_packet, | |
1520 | skb_headlen(skb)); | |
1521 | break; | |
1522 | ||
1523 | case VIS_TYPE_CLIENT_UPDATE: | |
1524 | receive_client_update_packet(bat_priv, vis_packet, | |
1525 | skb_headlen(skb)); | |
1526 | break; | |
1527 | ||
1528 | default: /* ignore unknown packet */ | |
1529 | break; | |
1530 | } | |
1531 | ||
1532 | /* We take a copy of the data in the packet, so we should | |
1533 | always free the skbuf. */ | |
1534 | return NET_RX_DROP; | |
1535 | } |