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 | ||
67 | static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, | |
68 | unsigned char *hna_buff, int hna_buff_len) | |
69 | { | |
70 | if ((hna_buff_len != orig_node->hna_buff_len) || | |
71 | ((hna_buff_len > 0) && | |
72 | (orig_node->hna_buff_len > 0) && | |
73 | (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { | |
74 | ||
75 | if (orig_node->hna_buff_len > 0) | |
76 | hna_global_del_orig(bat_priv, orig_node, | |
77 | "originator changed hna"); | |
78 | ||
79 | if ((hna_buff_len > 0) && (hna_buff)) | |
80 | hna_global_add_orig(bat_priv, orig_node, | |
81 | hna_buff, hna_buff_len); | |
82 | } | |
83 | } | |
84 | ||
85 | static void update_route(struct bat_priv *bat_priv, | |
86 | struct orig_node *orig_node, | |
87 | struct neigh_node *neigh_node, | |
88 | unsigned char *hna_buff, int hna_buff_len) | |
89 | { | |
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); | |
99 | hna_global_del_orig(bat_priv, orig_node, | |
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); | |
108 | hna_global_add_orig(bat_priv, orig_node, | |
109 | hna_buff, hna_buff_len); | |
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, | |
138 | struct neigh_node *neigh_node, unsigned char *hna_buff, | |
139 | int hna_buff_len) | |
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 SE |
149 | update_route(bat_priv, orig_node, neigh_node, |
150 | hna_buff, hna_buff_len); | |
151 | /* may be just HNA changed */ | |
152 | else | |
153 | update_HNA(bat_priv, orig_node, hna_buff, hna_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 SE |
171 | |
172 | if (orig_node == orig_neigh_node) { | |
f987ed6e ML |
173 | rcu_read_lock(); |
174 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
175 | &orig_node->neigh_list, list) { | |
c6c8fea2 | 176 | |
1605d0d6 ML |
177 | if (!compare_eth(tmp_neigh_node->addr, |
178 | orig_neigh_node->orig)) | |
179 | continue; | |
180 | ||
181 | if (tmp_neigh_node->if_incoming != if_incoming) | |
182 | continue; | |
183 | ||
184 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
185 | continue; | |
186 | ||
187 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 188 | } |
1605d0d6 | 189 | rcu_read_unlock(); |
c6c8fea2 SE |
190 | |
191 | if (!neigh_node) | |
192 | neigh_node = create_neighbor(orig_node, | |
193 | orig_neigh_node, | |
194 | orig_neigh_node->orig, | |
195 | if_incoming); | |
c6c8fea2 | 196 | if (!neigh_node) |
1605d0d6 | 197 | goto out; |
c6c8fea2 SE |
198 | |
199 | neigh_node->last_valid = jiffies; | |
200 | } else { | |
201 | /* find packet count of corresponding one hop neighbor */ | |
f987ed6e ML |
202 | rcu_read_lock(); |
203 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
204 | &orig_neigh_node->neigh_list, list) { | |
c6c8fea2 | 205 | |
1605d0d6 ML |
206 | if (!compare_eth(tmp_neigh_node->addr, |
207 | orig_neigh_node->orig)) | |
208 | continue; | |
209 | ||
210 | if (tmp_neigh_node->if_incoming != if_incoming) | |
211 | continue; | |
212 | ||
213 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
214 | continue; | |
215 | ||
216 | neigh_node = tmp_neigh_node; | |
c6c8fea2 | 217 | } |
1605d0d6 | 218 | rcu_read_unlock(); |
c6c8fea2 SE |
219 | |
220 | if (!neigh_node) | |
221 | neigh_node = create_neighbor(orig_neigh_node, | |
222 | orig_neigh_node, | |
223 | orig_neigh_node->orig, | |
224 | if_incoming); | |
c6c8fea2 | 225 | if (!neigh_node) |
1605d0d6 | 226 | goto out; |
c6c8fea2 SE |
227 | } |
228 | ||
229 | orig_node->last_valid = jiffies; | |
230 | ||
0ede9f41 ML |
231 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
232 | orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; | |
233 | neigh_rq_count = neigh_node->real_packet_count; | |
234 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
235 | ||
c6c8fea2 | 236 | /* pay attention to not get a value bigger than 100 % */ |
0ede9f41 ML |
237 | total_count = (orig_eq_count > neigh_rq_count ? |
238 | neigh_rq_count : orig_eq_count); | |
c6c8fea2 SE |
239 | |
240 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
241 | /* if we receive too few packets it is not considered bidirectional */ | |
242 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || | |
0ede9f41 ML |
243 | (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) |
244 | tq_own = 0; | |
c6c8fea2 SE |
245 | else |
246 | /* neigh_node->real_packet_count is never zero as we | |
247 | * only purge old information when getting new | |
248 | * information */ | |
0ede9f41 | 249 | tq_own = (TQ_MAX_VALUE * total_count) / neigh_rq_count; |
c6c8fea2 SE |
250 | |
251 | /* | |
252 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does | |
253 | * affect the nearly-symmetric links only a little, but | |
254 | * punishes asymmetric links more. This will give a value | |
255 | * between 0 and TQ_MAX_VALUE | |
256 | */ | |
0ede9f41 ML |
257 | tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * |
258 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
259 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) * | |
260 | (TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) / | |
261 | (TQ_LOCAL_WINDOW_SIZE * | |
262 | TQ_LOCAL_WINDOW_SIZE * | |
263 | TQ_LOCAL_WINDOW_SIZE); | |
264 | ||
265 | batman_packet->tq = ((batman_packet->tq * tq_own * tq_asym_penalty) / | |
266 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
c6c8fea2 SE |
267 | |
268 | bat_dbg(DBG_BATMAN, bat_priv, | |
269 | "bidirectional: " | |
270 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
271 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
272 | "total tq: %3i\n", | |
273 | orig_node->orig, orig_neigh_node->orig, total_count, | |
0ede9f41 | 274 | neigh_rq_count, tq_own, tq_asym_penalty, batman_packet->tq); |
c6c8fea2 SE |
275 | |
276 | /* if link has the minimum required transmission quality | |
277 | * consider it bidirectional */ | |
278 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) | |
a775eb84 ML |
279 | ret = 1; |
280 | ||
a775eb84 ML |
281 | out: |
282 | if (neigh_node) | |
44524fcd | 283 | neigh_node_free_ref(neigh_node); |
a775eb84 | 284 | return ret; |
c6c8fea2 SE |
285 | } |
286 | ||
a4c135c5 SW |
287 | /* caller must hold the neigh_list_lock */ |
288 | void bonding_candidate_del(struct orig_node *orig_node, | |
289 | struct neigh_node *neigh_node) | |
290 | { | |
291 | /* this neighbor is not part of our candidate list */ | |
292 | if (list_empty(&neigh_node->bonding_list)) | |
293 | goto out; | |
294 | ||
295 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 296 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 297 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
298 | atomic_dec(&orig_node->bond_candidates); |
299 | ||
300 | out: | |
301 | return; | |
302 | } | |
303 | ||
304 | static void bonding_candidate_add(struct orig_node *orig_node, | |
305 | struct neigh_node *neigh_node) | |
306 | { | |
307 | struct hlist_node *node; | |
e1a5382f LL |
308 | struct neigh_node *tmp_neigh_node, *router = NULL; |
309 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
310 | |
311 | spin_lock_bh(&orig_node->neigh_list_lock); | |
312 | ||
313 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
314 | if (!compare_eth(orig_node->orig, |
315 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
316 | goto candidate_del; |
317 | ||
e1a5382f LL |
318 | router = orig_node_get_router(orig_node); |
319 | if (!router) | |
a4c135c5 SW |
320 | goto candidate_del; |
321 | ||
a4c135c5 | 322 | /* ... and is good enough to be considered */ |
e1a5382f | 323 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
324 | goto candidate_del; |
325 | ||
326 | /** | |
327 | * check if we have another candidate with the same mac address or | |
328 | * interface. If we do, we won't select this candidate because of | |
329 | * possible interference. | |
330 | */ | |
331 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
332 | &orig_node->neigh_list, list) { | |
333 | ||
334 | if (tmp_neigh_node == neigh_node) | |
335 | continue; | |
336 | ||
337 | /* we only care if the other candidate is even | |
338 | * considered as candidate. */ | |
339 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
340 | continue; | |
341 | ||
342 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 343 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
344 | interference_candidate = 1; |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | /* don't care further if it is an interference candidate */ | |
350 | if (interference_candidate) | |
351 | goto candidate_del; | |
352 | ||
353 | /* this neighbor already is part of our candidate list */ | |
354 | if (!list_empty(&neigh_node->bonding_list)) | |
355 | goto out; | |
356 | ||
44524fcd ML |
357 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
358 | goto out; | |
359 | ||
a4c135c5 | 360 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
361 | atomic_inc(&orig_node->bond_candidates); |
362 | goto out; | |
363 | ||
364 | candidate_del: | |
365 | bonding_candidate_del(orig_node, neigh_node); | |
366 | ||
367 | out: | |
368 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
369 | |
370 | if (router) | |
371 | neigh_node_free_ref(router); | |
a4c135c5 SW |
372 | } |
373 | ||
374 | /* copy primary address for bonding */ | |
375 | static void bonding_save_primary(struct orig_node *orig_node, | |
376 | struct orig_node *orig_neigh_node, | |
377 | struct batman_packet *batman_packet) | |
378 | { | |
379 | if (!(batman_packet->flags & PRIMARIES_FIRST_HOP)) | |
380 | return; | |
381 | ||
382 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
383 | } | |
384 | ||
c6c8fea2 SE |
385 | static void update_orig(struct bat_priv *bat_priv, |
386 | struct orig_node *orig_node, | |
387 | struct ethhdr *ethhdr, | |
388 | struct batman_packet *batman_packet, | |
e6c10f43 | 389 | struct hard_iface *if_incoming, |
c6c8fea2 SE |
390 | unsigned char *hna_buff, int hna_buff_len, |
391 | char is_duplicate) | |
392 | { | |
393 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
e1a5382f | 394 | struct neigh_node *router = NULL; |
2ae2daf6 | 395 | struct orig_node *orig_node_tmp; |
9591a79f | 396 | struct hlist_node *node; |
c6c8fea2 | 397 | int tmp_hna_buff_len; |
2ae2daf6 | 398 | uint8_t bcast_own_sum_orig, bcast_own_sum_neigh; |
c6c8fea2 SE |
399 | |
400 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " | |
401 | "Searching and updating originator entry of received packet\n"); | |
402 | ||
f987ed6e ML |
403 | rcu_read_lock(); |
404 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
405 | &orig_node->neigh_list, list) { | |
39901e71 | 406 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
44524fcd ML |
407 | (tmp_neigh_node->if_incoming == if_incoming) && |
408 | atomic_inc_not_zero(&tmp_neigh_node->refcount)) { | |
409 | if (neigh_node) | |
410 | neigh_node_free_ref(neigh_node); | |
c6c8fea2 SE |
411 | neigh_node = tmp_neigh_node; |
412 | continue; | |
413 | } | |
414 | ||
415 | if (is_duplicate) | |
416 | continue; | |
417 | ||
418 | ring_buffer_set(tmp_neigh_node->tq_recv, | |
419 | &tmp_neigh_node->tq_index, 0); | |
420 | tmp_neigh_node->tq_avg = | |
421 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
422 | } | |
423 | ||
424 | if (!neigh_node) { | |
425 | struct orig_node *orig_tmp; | |
426 | ||
427 | orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); | |
428 | if (!orig_tmp) | |
a775eb84 | 429 | goto unlock; |
c6c8fea2 SE |
430 | |
431 | neigh_node = create_neighbor(orig_node, orig_tmp, | |
432 | ethhdr->h_source, if_incoming); | |
16b1aba8 | 433 | |
7b36e8ee | 434 | orig_node_free_ref(orig_tmp); |
c6c8fea2 | 435 | if (!neigh_node) |
a775eb84 | 436 | goto unlock; |
c6c8fea2 SE |
437 | } else |
438 | bat_dbg(DBG_BATMAN, bat_priv, | |
439 | "Updating existing last-hop neighbor of originator\n"); | |
440 | ||
a775eb84 ML |
441 | rcu_read_unlock(); |
442 | ||
c6c8fea2 SE |
443 | orig_node->flags = batman_packet->flags; |
444 | neigh_node->last_valid = jiffies; | |
445 | ||
446 | ring_buffer_set(neigh_node->tq_recv, | |
447 | &neigh_node->tq_index, | |
448 | batman_packet->tq); | |
449 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); | |
450 | ||
451 | if (!is_duplicate) { | |
452 | orig_node->last_ttl = batman_packet->ttl; | |
453 | neigh_node->last_ttl = batman_packet->ttl; | |
454 | } | |
455 | ||
a4c135c5 SW |
456 | bonding_candidate_add(orig_node, neigh_node); |
457 | ||
c6c8fea2 SE |
458 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
459 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); | |
460 | ||
461 | /* if this neighbor already is our next hop there is nothing | |
462 | * to change */ | |
e1a5382f LL |
463 | router = orig_node_get_router(orig_node); |
464 | if (router == neigh_node) | |
c6c8fea2 SE |
465 | goto update_hna; |
466 | ||
467 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
e1a5382f | 468 | if (router && (router->tq_avg > neigh_node->tq_avg)) |
c6c8fea2 SE |
469 | goto update_hna; |
470 | ||
471 | /* if the TQ is the same and the link not more symetric we | |
472 | * won't consider it either */ | |
e1a5382f LL |
473 | if (router && (neigh_node->tq_avg == router->tq_avg)) { |
474 | orig_node_tmp = router->orig_node; | |
2ae2daf6 ML |
475 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
476 | bcast_own_sum_orig = | |
477 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
478 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
479 | ||
480 | orig_node_tmp = neigh_node->orig_node; | |
481 | spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); | |
482 | bcast_own_sum_neigh = | |
483 | orig_node_tmp->bcast_own_sum[if_incoming->if_num]; | |
484 | spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); | |
485 | ||
486 | if (bcast_own_sum_orig >= bcast_own_sum_neigh) | |
487 | goto update_hna; | |
488 | } | |
c6c8fea2 SE |
489 | |
490 | update_routes(bat_priv, orig_node, neigh_node, | |
491 | hna_buff, tmp_hna_buff_len); | |
492 | goto update_gw; | |
493 | ||
494 | update_hna: | |
e1a5382f | 495 | update_routes(bat_priv, orig_node, router, |
c6c8fea2 SE |
496 | hna_buff, tmp_hna_buff_len); |
497 | ||
498 | update_gw: | |
499 | if (orig_node->gw_flags != batman_packet->gw_flags) | |
500 | gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); | |
501 | ||
502 | orig_node->gw_flags = batman_packet->gw_flags; | |
503 | ||
504 | /* restart gateway selection if fast or late switching was enabled */ | |
505 | if ((orig_node->gw_flags) && | |
506 | (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && | |
507 | (atomic_read(&bat_priv->gw_sel_class) > 2)) | |
508 | gw_check_election(bat_priv, orig_node); | |
a775eb84 ML |
509 | |
510 | goto out; | |
511 | ||
512 | unlock: | |
513 | rcu_read_unlock(); | |
514 | out: | |
515 | if (neigh_node) | |
44524fcd | 516 | neigh_node_free_ref(neigh_node); |
e1a5382f LL |
517 | if (router) |
518 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
519 | } |
520 | ||
521 | /* checks whether the host restarted and is in the protection time. | |
522 | * returns: | |
523 | * 0 if the packet is to be accepted | |
524 | * 1 if the packet is to be ignored. | |
525 | */ | |
526 | static int window_protected(struct bat_priv *bat_priv, | |
527 | int32_t seq_num_diff, | |
528 | unsigned long *last_reset) | |
529 | { | |
530 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) | |
531 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
532 | if (time_after(jiffies, *last_reset + | |
533 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
534 | ||
535 | *last_reset = jiffies; | |
536 | bat_dbg(DBG_BATMAN, bat_priv, | |
537 | "old packet received, start protection\n"); | |
538 | ||
539 | return 0; | |
540 | } else | |
541 | return 1; | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
547 | * finds out whether it is a duplicate. | |
548 | * returns: | |
549 | * 1 the packet is a duplicate | |
550 | * 0 the packet has not yet been received | |
551 | * -1 the packet is old and has been received while the seqno window | |
552 | * was protected. Caller should drop it. | |
553 | */ | |
554 | static char count_real_packets(struct ethhdr *ethhdr, | |
555 | struct batman_packet *batman_packet, | |
e6c10f43 | 556 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
557 | { |
558 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
559 | struct orig_node *orig_node; | |
560 | struct neigh_node *tmp_neigh_node; | |
9591a79f | 561 | struct hlist_node *node; |
c6c8fea2 SE |
562 | char is_duplicate = 0; |
563 | int32_t seq_diff; | |
564 | int need_update = 0; | |
0ede9f41 | 565 | int set_mark, ret = -1; |
c6c8fea2 SE |
566 | |
567 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
568 | if (!orig_node) | |
569 | return 0; | |
570 | ||
0ede9f41 | 571 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 SE |
572 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
573 | ||
574 | /* signalize caller that the packet is to be dropped. */ | |
575 | if (window_protected(bat_priv, seq_diff, | |
576 | &orig_node->batman_seqno_reset)) | |
0ede9f41 | 577 | goto out; |
c6c8fea2 | 578 | |
f987ed6e ML |
579 | rcu_read_lock(); |
580 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
581 | &orig_node->neigh_list, list) { | |
c6c8fea2 SE |
582 | |
583 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, | |
584 | orig_node->last_real_seqno, | |
585 | batman_packet->seqno); | |
586 | ||
39901e71 | 587 | if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) && |
c6c8fea2 SE |
588 | (tmp_neigh_node->if_incoming == if_incoming)) |
589 | set_mark = 1; | |
590 | else | |
591 | set_mark = 0; | |
592 | ||
593 | /* if the window moved, set the update flag. */ | |
594 | need_update |= bit_get_packet(bat_priv, | |
595 | tmp_neigh_node->real_bits, | |
596 | seq_diff, set_mark); | |
597 | ||
598 | tmp_neigh_node->real_packet_count = | |
599 | bit_packet_count(tmp_neigh_node->real_bits); | |
600 | } | |
f987ed6e | 601 | rcu_read_unlock(); |
c6c8fea2 SE |
602 | |
603 | if (need_update) { | |
604 | bat_dbg(DBG_BATMAN, bat_priv, | |
605 | "updating last_seqno: old %d, new %d\n", | |
606 | orig_node->last_real_seqno, batman_packet->seqno); | |
607 | orig_node->last_real_seqno = batman_packet->seqno; | |
608 | } | |
609 | ||
0ede9f41 | 610 | ret = is_duplicate; |
16b1aba8 | 611 | |
0ede9f41 ML |
612 | out: |
613 | spin_unlock_bh(&orig_node->ogm_cnt_lock); | |
7b36e8ee | 614 | orig_node_free_ref(orig_node); |
0ede9f41 | 615 | return ret; |
c6c8fea2 SE |
616 | } |
617 | ||
c6c8fea2 | 618 | void receive_bat_packet(struct ethhdr *ethhdr, |
a4c135c5 SW |
619 | struct batman_packet *batman_packet, |
620 | unsigned char *hna_buff, int hna_buff_len, | |
e6c10f43 | 621 | struct hard_iface *if_incoming) |
c6c8fea2 SE |
622 | { |
623 | struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); | |
e6c10f43 | 624 | struct hard_iface *hard_iface; |
c6c8fea2 | 625 | struct orig_node *orig_neigh_node, *orig_node; |
e1a5382f LL |
626 | struct neigh_node *router = NULL, *router_router = NULL; |
627 | struct neigh_node *orig_neigh_router = NULL; | |
c6c8fea2 SE |
628 | char has_directlink_flag; |
629 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; | |
630 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
631 | char is_duplicate; | |
632 | uint32_t if_incoming_seqno; | |
633 | ||
634 | /* Silently drop when the batman packet is actually not a | |
635 | * correct packet. | |
636 | * | |
637 | * This might happen if a packet is padded (e.g. Ethernet has a | |
638 | * minimum frame length of 64 byte) and the aggregation interprets | |
639 | * it as an additional length. | |
640 | * | |
641 | * TODO: A more sane solution would be to have a bit in the | |
642 | * batman_packet to detect whether the packet is the last | |
643 | * packet in an aggregation. Here we expect that the padding | |
644 | * is always zero (or not 0x01) | |
645 | */ | |
646 | if (batman_packet->packet_type != BAT_PACKET) | |
647 | return; | |
648 | ||
649 | /* could be changed by schedule_own_packet() */ | |
650 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
651 | ||
652 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); | |
653 | ||
39901e71 ML |
654 | is_single_hop_neigh = (compare_eth(ethhdr->h_source, |
655 | batman_packet->orig) ? 1 : 0); | |
c6c8fea2 SE |
656 | |
657 | bat_dbg(DBG_BATMAN, bat_priv, | |
658 | "Received BATMAN packet via NB: %pM, IF: %s [%pM] " | |
659 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " | |
660 | "TTL %d, V %d, IDF %d)\n", | |
661 | ethhdr->h_source, if_incoming->net_dev->name, | |
662 | if_incoming->net_dev->dev_addr, batman_packet->orig, | |
663 | batman_packet->prev_sender, batman_packet->seqno, | |
664 | batman_packet->tq, batman_packet->ttl, batman_packet->version, | |
665 | has_directlink_flag); | |
666 | ||
667 | rcu_read_lock(); | |
e6c10f43 ML |
668 | list_for_each_entry_rcu(hard_iface, &hardif_list, list) { |
669 | if (hard_iface->if_status != IF_ACTIVE) | |
c6c8fea2 SE |
670 | continue; |
671 | ||
e6c10f43 | 672 | if (hard_iface->soft_iface != if_incoming->soft_iface) |
c6c8fea2 SE |
673 | continue; |
674 | ||
39901e71 | 675 | if (compare_eth(ethhdr->h_source, |
e6c10f43 | 676 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
677 | is_my_addr = 1; |
678 | ||
39901e71 | 679 | if (compare_eth(batman_packet->orig, |
e6c10f43 | 680 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
681 | is_my_orig = 1; |
682 | ||
39901e71 | 683 | if (compare_eth(batman_packet->prev_sender, |
e6c10f43 | 684 | hard_iface->net_dev->dev_addr)) |
c6c8fea2 SE |
685 | is_my_oldorig = 1; |
686 | ||
39901e71 | 687 | if (compare_eth(ethhdr->h_source, broadcast_addr)) |
c6c8fea2 SE |
688 | is_broadcast = 1; |
689 | } | |
690 | rcu_read_unlock(); | |
691 | ||
692 | if (batman_packet->version != COMPAT_VERSION) { | |
693 | bat_dbg(DBG_BATMAN, bat_priv, | |
694 | "Drop packet: incompatible batman version (%i)\n", | |
695 | batman_packet->version); | |
696 | return; | |
697 | } | |
698 | ||
699 | if (is_my_addr) { | |
700 | bat_dbg(DBG_BATMAN, bat_priv, | |
701 | "Drop packet: received my own broadcast (sender: %pM" | |
702 | ")\n", | |
703 | ethhdr->h_source); | |
704 | return; | |
705 | } | |
706 | ||
707 | if (is_broadcast) { | |
708 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
709 | "ignoring all packets with broadcast source addr (sender: %pM" | |
710 | ")\n", ethhdr->h_source); | |
711 | return; | |
712 | } | |
713 | ||
714 | if (is_my_orig) { | |
715 | unsigned long *word; | |
716 | int offset; | |
717 | ||
718 | orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source); | |
c6c8fea2 SE |
719 | if (!orig_neigh_node) |
720 | return; | |
721 | ||
722 | /* neighbor has to indicate direct link and it has to | |
723 | * come via the corresponding interface */ | |
724 | /* if received seqno equals last send seqno save new | |
725 | * seqno for bidirectional check */ | |
726 | if (has_directlink_flag && | |
39901e71 ML |
727 | compare_eth(if_incoming->net_dev->dev_addr, |
728 | batman_packet->orig) && | |
c6c8fea2 SE |
729 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { |
730 | offset = if_incoming->if_num * NUM_WORDS; | |
2ae2daf6 ML |
731 | |
732 | spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); | |
c6c8fea2 SE |
733 | word = &(orig_neigh_node->bcast_own[offset]); |
734 | bit_mark(word, 0); | |
735 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
736 | bit_packet_count(word); | |
2ae2daf6 | 737 | spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
c6c8fea2 SE |
738 | } |
739 | ||
740 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " | |
741 | "originator packet from myself (via neighbor)\n"); | |
7b36e8ee | 742 | orig_node_free_ref(orig_neigh_node); |
c6c8fea2 SE |
743 | return; |
744 | } | |
745 | ||
746 | if (is_my_oldorig) { | |
747 | bat_dbg(DBG_BATMAN, bat_priv, | |
748 | "Drop packet: ignoring all rebroadcast echos (sender: " | |
749 | "%pM)\n", ethhdr->h_source); | |
750 | return; | |
751 | } | |
752 | ||
753 | orig_node = get_orig_node(bat_priv, batman_packet->orig); | |
754 | if (!orig_node) | |
755 | return; | |
756 | ||
757 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
758 | ||
759 | if (is_duplicate == -1) { | |
760 | bat_dbg(DBG_BATMAN, bat_priv, | |
761 | "Drop packet: packet within seqno protection time " | |
762 | "(sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 763 | goto out; |
c6c8fea2 SE |
764 | } |
765 | ||
766 | if (batman_packet->tq == 0) { | |
767 | bat_dbg(DBG_BATMAN, bat_priv, | |
768 | "Drop packet: originator packet with tq equal 0\n"); | |
16b1aba8 | 769 | goto out; |
c6c8fea2 SE |
770 | } |
771 | ||
e1a5382f LL |
772 | router = orig_node_get_router(orig_node); |
773 | if (router) | |
774 | router_router = orig_node_get_router(router->orig_node); | |
775 | ||
c6c8fea2 | 776 | /* avoid temporary routing loops */ |
e1a5382f LL |
777 | if (router && router_router && |
778 | (compare_eth(router->addr, batman_packet->prev_sender)) && | |
39901e71 | 779 | !(compare_eth(batman_packet->orig, batman_packet->prev_sender)) && |
e1a5382f | 780 | (compare_eth(router->addr, router_router->addr))) { |
c6c8fea2 SE |
781 | bat_dbg(DBG_BATMAN, bat_priv, |
782 | "Drop packet: ignoring all rebroadcast packets that " | |
783 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
16b1aba8 | 784 | goto out; |
c6c8fea2 SE |
785 | } |
786 | ||
787 | /* if sender is a direct neighbor the sender mac equals | |
788 | * originator mac */ | |
789 | orig_neigh_node = (is_single_hop_neigh ? | |
790 | orig_node : | |
791 | get_orig_node(bat_priv, ethhdr->h_source)); | |
792 | if (!orig_neigh_node) | |
d0072609 | 793 | goto out; |
c6c8fea2 | 794 | |
e1a5382f LL |
795 | orig_neigh_router = orig_node_get_router(orig_neigh_node); |
796 | ||
c6c8fea2 SE |
797 | /* drop packet if sender is not a direct neighbor and if we |
798 | * don't route towards it */ | |
e1a5382f | 799 | if (!is_single_hop_neigh && (!orig_neigh_router)) { |
c6c8fea2 SE |
800 | bat_dbg(DBG_BATMAN, bat_priv, |
801 | "Drop packet: OGM via unknown neighbor!\n"); | |
16b1aba8 | 802 | goto out_neigh; |
c6c8fea2 SE |
803 | } |
804 | ||
805 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, | |
806 | batman_packet, if_incoming); | |
807 | ||
a4c135c5 SW |
808 | bonding_save_primary(orig_node, orig_neigh_node, batman_packet); |
809 | ||
c6c8fea2 SE |
810 | /* update ranking if it is not a duplicate or has the same |
811 | * seqno and similar ttl as the non-duplicate */ | |
812 | if (is_bidirectional && | |
813 | (!is_duplicate || | |
814 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
815 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
816 | update_orig(bat_priv, orig_node, ethhdr, batman_packet, | |
817 | if_incoming, hna_buff, hna_buff_len, is_duplicate); | |
818 | ||
c6c8fea2 SE |
819 | /* is single hop (direct) neighbor */ |
820 | if (is_single_hop_neigh) { | |
821 | ||
822 | /* mark direct link on incoming interface */ | |
823 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
824 | 1, hna_buff_len, if_incoming); | |
825 | ||
826 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " | |
827 | "rebroadcast neighbor packet with direct link flag\n"); | |
16b1aba8 | 828 | goto out_neigh; |
c6c8fea2 SE |
829 | } |
830 | ||
831 | /* multihop originator */ | |
832 | if (!is_bidirectional) { | |
833 | bat_dbg(DBG_BATMAN, bat_priv, | |
834 | "Drop packet: not received via bidirectional link\n"); | |
16b1aba8 | 835 | goto out_neigh; |
c6c8fea2 SE |
836 | } |
837 | ||
838 | if (is_duplicate) { | |
839 | bat_dbg(DBG_BATMAN, bat_priv, | |
840 | "Drop packet: duplicate packet received\n"); | |
16b1aba8 | 841 | goto out_neigh; |
c6c8fea2 SE |
842 | } |
843 | ||
844 | bat_dbg(DBG_BATMAN, bat_priv, | |
845 | "Forwarding packet: rebroadcast originator packet\n"); | |
846 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
847 | 0, hna_buff_len, if_incoming); | |
16b1aba8 ML |
848 | |
849 | out_neigh: | |
7b36e8ee ML |
850 | if ((orig_neigh_node) && (!is_single_hop_neigh)) |
851 | orig_node_free_ref(orig_neigh_node); | |
16b1aba8 | 852 | out: |
e1a5382f LL |
853 | if (router) |
854 | neigh_node_free_ref(router); | |
855 | if (router_router) | |
856 | neigh_node_free_ref(router_router); | |
857 | if (orig_neigh_router) | |
858 | neigh_node_free_ref(orig_neigh_router); | |
859 | ||
7b36e8ee | 860 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
861 | } |
862 | ||
e6c10f43 | 863 | int recv_bat_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 864 | { |
c6c8fea2 SE |
865 | struct ethhdr *ethhdr; |
866 | ||
867 | /* drop packet if it has not necessary minimum size */ | |
868 | if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) | |
869 | return NET_RX_DROP; | |
870 | ||
871 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
872 | ||
873 | /* packet with broadcast indication but unicast recipient */ | |
874 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
875 | return NET_RX_DROP; | |
876 | ||
877 | /* packet with broadcast sender address */ | |
878 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
879 | return NET_RX_DROP; | |
880 | ||
881 | /* create a copy of the skb, if needed, to modify it. */ | |
882 | if (skb_cow(skb, 0) < 0) | |
883 | return NET_RX_DROP; | |
884 | ||
885 | /* keep skb linear */ | |
886 | if (skb_linearize(skb) < 0) | |
887 | return NET_RX_DROP; | |
888 | ||
889 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
890 | ||
c6c8fea2 SE |
891 | receive_aggr_bat_packet(ethhdr, |
892 | skb->data, | |
893 | skb_headlen(skb), | |
e6c10f43 | 894 | hard_iface); |
c6c8fea2 SE |
895 | |
896 | kfree_skb(skb); | |
897 | return NET_RX_SUCCESS; | |
898 | } | |
899 | ||
900 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
901 | struct sk_buff *skb, size_t icmp_len) | |
902 | { | |
44524fcd | 903 | struct orig_node *orig_node = NULL; |
e1a5382f | 904 | struct neigh_node *router = NULL; |
c6c8fea2 | 905 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 906 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
907 | |
908 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
909 | |
910 | /* add data to device queue */ | |
911 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
912 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 913 | goto out; |
c6c8fea2 SE |
914 | } |
915 | ||
916 | if (!bat_priv->primary_if) | |
44524fcd | 917 | goto out; |
c6c8fea2 SE |
918 | |
919 | /* answer echo request (ping) */ | |
920 | /* get routing information */ | |
7aadf889 | 921 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 922 | if (!orig_node) |
e1a5382f | 923 | goto out; |
c6c8fea2 | 924 | |
e1a5382f LL |
925 | router = orig_node_get_router(orig_node); |
926 | if (!router) | |
927 | goto out; | |
c6c8fea2 | 928 | |
44524fcd ML |
929 | /* create a copy of the skb, if needed, to modify it. */ |
930 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
931 | goto out; | |
932 | ||
933 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
934 | ||
935 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
936 | memcpy(icmp_packet->orig, | |
937 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
938 | icmp_packet->msg_type = ECHO_REPLY; | |
939 | icmp_packet->ttl = TTL; | |
940 | ||
e1a5382f | 941 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 942 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 943 | |
44524fcd | 944 | out: |
e1a5382f LL |
945 | if (router) |
946 | neigh_node_free_ref(router); | |
44524fcd | 947 | if (orig_node) |
7b36e8ee | 948 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
949 | return ret; |
950 | } | |
951 | ||
952 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 953 | struct sk_buff *skb) |
c6c8fea2 | 954 | { |
44524fcd | 955 | struct orig_node *orig_node = NULL; |
e1a5382f | 956 | struct neigh_node *router = NULL; |
c6c8fea2 | 957 | struct icmp_packet *icmp_packet; |
44524fcd | 958 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
959 | |
960 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
961 | |
962 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
963 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
964 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
965 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
966 | icmp_packet->dst); | |
44524fcd | 967 | goto out; |
c6c8fea2 SE |
968 | } |
969 | ||
970 | if (!bat_priv->primary_if) | |
44524fcd | 971 | goto out; |
c6c8fea2 SE |
972 | |
973 | /* get routing information */ | |
7aadf889 | 974 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 975 | if (!orig_node) |
e1a5382f | 976 | goto out; |
c6c8fea2 | 977 | |
e1a5382f LL |
978 | router = orig_node_get_router(orig_node); |
979 | if (!router) | |
980 | goto out; | |
c6c8fea2 | 981 | |
44524fcd ML |
982 | /* create a copy of the skb, if needed, to modify it. */ |
983 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
984 | goto out; | |
c6c8fea2 | 985 | |
44524fcd | 986 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 987 | |
44524fcd ML |
988 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
989 | memcpy(icmp_packet->orig, | |
990 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
991 | icmp_packet->msg_type = TTL_EXCEEDED; | |
992 | icmp_packet->ttl = TTL; | |
993 | ||
e1a5382f | 994 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 995 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 996 | |
44524fcd | 997 | out: |
e1a5382f LL |
998 | if (router) |
999 | neigh_node_free_ref(router); | |
44524fcd | 1000 | if (orig_node) |
7b36e8ee | 1001 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1002 | return ret; |
1003 | } | |
1004 | ||
1005 | ||
e6c10f43 | 1006 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1007 | { |
1008 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1009 | struct icmp_packet_rr *icmp_packet; | |
1010 | struct ethhdr *ethhdr; | |
44524fcd | 1011 | struct orig_node *orig_node = NULL; |
e1a5382f | 1012 | struct neigh_node *router = NULL; |
c6c8fea2 | 1013 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 1014 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1015 | |
1016 | /** | |
1017 | * we truncate all incoming icmp packets if they don't match our size | |
1018 | */ | |
1019 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
1020 | hdr_size = sizeof(struct icmp_packet_rr); | |
1021 | ||
1022 | /* drop packet if it has not necessary minimum size */ | |
1023 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 1024 | goto out; |
c6c8fea2 SE |
1025 | |
1026 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1027 | ||
1028 | /* packet with unicast indication but broadcast recipient */ | |
1029 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 1030 | goto out; |
c6c8fea2 SE |
1031 | |
1032 | /* packet with broadcast sender address */ | |
1033 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 1034 | goto out; |
c6c8fea2 SE |
1035 | |
1036 | /* not for me */ | |
1037 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 1038 | goto out; |
c6c8fea2 SE |
1039 | |
1040 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
1041 | ||
1042 | /* add record route information if not full */ | |
1043 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
1044 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
1045 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
1046 | ethhdr->h_dest, ETH_ALEN); | |
1047 | icmp_packet->rr_cur++; | |
1048 | } | |
1049 | ||
1050 | /* packet for me */ | |
1051 | if (is_my_mac(icmp_packet->dst)) | |
1052 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
1053 | ||
1054 | /* TTL exceeded */ | |
1055 | if (icmp_packet->ttl < 2) | |
74ef1153 | 1056 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 1057 | |
c6c8fea2 | 1058 | /* get routing information */ |
7aadf889 | 1059 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 1060 | if (!orig_node) |
e1a5382f | 1061 | goto out; |
c6c8fea2 | 1062 | |
e1a5382f LL |
1063 | router = orig_node_get_router(orig_node); |
1064 | if (!router) | |
1065 | goto out; | |
c6c8fea2 | 1066 | |
44524fcd ML |
1067 | /* create a copy of the skb, if needed, to modify it. */ |
1068 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
1069 | goto out; | |
c6c8fea2 | 1070 | |
44524fcd | 1071 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 1072 | |
44524fcd ML |
1073 | /* decrement ttl */ |
1074 | icmp_packet->ttl--; | |
1075 | ||
1076 | /* route it */ | |
e1a5382f | 1077 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 1078 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 1079 | |
44524fcd | 1080 | out: |
e1a5382f LL |
1081 | if (router) |
1082 | neigh_node_free_ref(router); | |
44524fcd | 1083 | if (orig_node) |
7b36e8ee | 1084 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
1085 | return ret; |
1086 | } | |
1087 | ||
55158629 LL |
1088 | /* In the bonding case, send the packets in a round |
1089 | * robin fashion over the remaining interfaces. | |
1090 | * | |
1091 | * This method rotates the bonding list and increases the | |
1092 | * returned router's refcount. */ | |
1093 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
1094 | struct hard_iface *recv_if) | |
1095 | { | |
1096 | struct neigh_node *tmp_neigh_node; | |
1097 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1098 | ||
1099 | rcu_read_lock(); | |
1100 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1101 | bonding_list) { | |
1102 | if (!first_candidate) | |
1103 | first_candidate = tmp_neigh_node; | |
1104 | ||
1105 | /* recv_if == NULL on the first node. */ | |
1106 | if (tmp_neigh_node->if_incoming == recv_if) | |
1107 | continue; | |
1108 | ||
1109 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1110 | continue; | |
1111 | ||
1112 | router = tmp_neigh_node; | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | /* use the first candidate if nothing was found. */ | |
1117 | if (!router && first_candidate && | |
1118 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1119 | router = first_candidate; | |
1120 | ||
1121 | if (!router) | |
1122 | goto out; | |
1123 | ||
1124 | /* selected should point to the next element | |
1125 | * after the current router */ | |
1126 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
1127 | /* this is a list_move(), which unfortunately | |
1128 | * does not exist as rcu version */ | |
1129 | list_del_rcu(&primary_orig->bond_list); | |
1130 | list_add_rcu(&primary_orig->bond_list, | |
1131 | &router->bonding_list); | |
1132 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
1133 | ||
1134 | out: | |
1135 | rcu_read_unlock(); | |
1136 | return router; | |
1137 | } | |
1138 | ||
1139 | /* Interface Alternating: Use the best of the | |
1140 | * remaining candidates which are not using | |
1141 | * this interface. | |
1142 | * | |
1143 | * Increases the returned router's refcount */ | |
1144 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
1145 | struct hard_iface *recv_if) | |
1146 | { | |
1147 | struct neigh_node *tmp_neigh_node; | |
1148 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
1149 | ||
1150 | rcu_read_lock(); | |
1151 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
1152 | bonding_list) { | |
1153 | if (!first_candidate) | |
1154 | first_candidate = tmp_neigh_node; | |
1155 | ||
1156 | /* recv_if == NULL on the first node. */ | |
1157 | if (tmp_neigh_node->if_incoming == recv_if) | |
1158 | continue; | |
1159 | ||
1160 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
1161 | continue; | |
1162 | ||
1163 | /* if we don't have a router yet | |
1164 | * or this one is better, choose it. */ | |
1165 | if ((!router) || | |
1166 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
1167 | /* decrement refcount of | |
1168 | * previously selected router */ | |
1169 | if (router) | |
1170 | neigh_node_free_ref(router); | |
1171 | ||
1172 | router = tmp_neigh_node; | |
1173 | atomic_inc_not_zero(&router->refcount); | |
1174 | } | |
1175 | ||
1176 | neigh_node_free_ref(tmp_neigh_node); | |
1177 | } | |
1178 | ||
1179 | /* use the first candidate if nothing was found. */ | |
1180 | if (!router && first_candidate && | |
1181 | atomic_inc_not_zero(&first_candidate->refcount)) | |
1182 | router = first_candidate; | |
1183 | ||
1184 | rcu_read_unlock(); | |
1185 | return router; | |
1186 | } | |
1187 | ||
c6c8fea2 | 1188 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
1189 | * bonding if possible. increases the found neighbors |
1190 | * refcount.*/ | |
c6c8fea2 SE |
1191 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
1192 | struct orig_node *orig_node, | |
e6c10f43 | 1193 | struct hard_iface *recv_if) |
c6c8fea2 SE |
1194 | { |
1195 | struct orig_node *primary_orig_node; | |
1196 | struct orig_node *router_orig; | |
55158629 | 1197 | struct neigh_node *router; |
c6c8fea2 SE |
1198 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
1199 | int bonding_enabled; | |
1200 | ||
1201 | if (!orig_node) | |
1202 | return NULL; | |
1203 | ||
e1a5382f LL |
1204 | router = orig_node_get_router(orig_node); |
1205 | if (!router) | |
c6c8fea2 SE |
1206 | return NULL; |
1207 | ||
1208 | /* without bonding, the first node should | |
1209 | * always choose the default router. */ | |
c6c8fea2 SE |
1210 | bonding_enabled = atomic_read(&bat_priv->bonding); |
1211 | ||
a4c135c5 SW |
1212 | rcu_read_lock(); |
1213 | /* select default router to output */ | |
e1a5382f LL |
1214 | router_orig = router->orig_node; |
1215 | if (!router_orig) { | |
a4c135c5 SW |
1216 | rcu_read_unlock(); |
1217 | return NULL; | |
1218 | } | |
1219 | ||
a4c135c5 SW |
1220 | if ((!recv_if) && (!bonding_enabled)) |
1221 | goto return_router; | |
c6c8fea2 SE |
1222 | |
1223 | /* if we have something in the primary_addr, we can search | |
1224 | * for a potential bonding candidate. */ | |
39901e71 | 1225 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 1226 | goto return_router; |
c6c8fea2 SE |
1227 | |
1228 | /* find the orig_node which has the primary interface. might | |
1229 | * even be the same as our router_orig in many cases */ | |
1230 | ||
39901e71 | 1231 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
1232 | primary_orig_node = router_orig; |
1233 | } else { | |
7aadf889 ML |
1234 | primary_orig_node = orig_hash_find(bat_priv, |
1235 | router_orig->primary_addr); | |
c6c8fea2 | 1236 | if (!primary_orig_node) |
a4c135c5 | 1237 | goto return_router; |
7aadf889 | 1238 | |
7b36e8ee | 1239 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
1240 | } |
1241 | ||
1242 | /* with less than 2 candidates, we can't do any | |
1243 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
1244 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
1245 | goto return_router; | |
c6c8fea2 | 1246 | |
c6c8fea2 SE |
1247 | /* all nodes between should choose a candidate which |
1248 | * is is not on the interface where the packet came | |
1249 | * in. */ | |
a4c135c5 | 1250 | |
44524fcd | 1251 | neigh_node_free_ref(router); |
c6c8fea2 | 1252 | |
55158629 LL |
1253 | if (bonding_enabled) |
1254 | router = find_bond_router(primary_orig_node, recv_if); | |
1255 | else | |
1256 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 1257 | |
a4c135c5 | 1258 | return_router: |
a4c135c5 | 1259 | rcu_read_unlock(); |
c6c8fea2 SE |
1260 | return router; |
1261 | } | |
1262 | ||
1263 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
1264 | { | |
1265 | struct ethhdr *ethhdr; | |
1266 | ||
1267 | /* drop packet if it has not necessary minimum size */ | |
1268 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1269 | return -1; | |
1270 | ||
1271 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1272 | ||
1273 | /* packet with unicast indication but broadcast recipient */ | |
1274 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
1275 | return -1; | |
1276 | ||
1277 | /* packet with broadcast sender address */ | |
1278 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
1279 | return -1; | |
1280 | ||
1281 | /* not for me */ | |
1282 | if (!is_my_mac(ethhdr->h_dest)) | |
1283 | return -1; | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | ||
7cefb149 | 1288 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1289 | { |
1290 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
1291 | struct orig_node *orig_node = NULL; |
1292 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
1293 | struct unicast_packet *unicast_packet; |
1294 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 1295 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1296 | struct sk_buff *new_skb; |
1297 | ||
1298 | unicast_packet = (struct unicast_packet *)skb->data; | |
1299 | ||
1300 | /* TTL exceeded */ | |
1301 | if (unicast_packet->ttl < 2) { | |
1302 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
1303 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1304 | unicast_packet->dest); | |
44524fcd | 1305 | goto out; |
c6c8fea2 SE |
1306 | } |
1307 | ||
1308 | /* get routing information */ | |
fb778ea1 | 1309 | rcu_read_lock(); |
7aadf889 ML |
1310 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
1311 | ||
44524fcd ML |
1312 | if (!orig_node) |
1313 | goto unlock; | |
1314 | ||
fb778ea1 | 1315 | rcu_read_unlock(); |
c6c8fea2 | 1316 | |
a4c135c5 | 1317 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 1318 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 1319 | |
d0072609 | 1320 | if (!neigh_node) |
44524fcd | 1321 | goto out; |
c6c8fea2 SE |
1322 | |
1323 | /* create a copy of the skb, if needed, to modify it. */ | |
1324 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 1325 | goto out; |
c6c8fea2 SE |
1326 | |
1327 | unicast_packet = (struct unicast_packet *)skb->data; | |
1328 | ||
1329 | if (unicast_packet->packet_type == BAT_UNICAST && | |
1330 | atomic_read(&bat_priv->fragmentation) && | |
d0072609 ML |
1331 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
1332 | ret = frag_send_skb(skb, bat_priv, | |
1333 | neigh_node->if_incoming, neigh_node->addr); | |
1334 | goto out; | |
1335 | } | |
c6c8fea2 SE |
1336 | |
1337 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
d0072609 | 1338 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
1339 | |
1340 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1341 | ||
1342 | if (ret == NET_RX_DROP) | |
44524fcd | 1343 | goto out; |
c6c8fea2 SE |
1344 | |
1345 | /* packet was buffered for late merge */ | |
44524fcd ML |
1346 | if (!new_skb) { |
1347 | ret = NET_RX_SUCCESS; | |
1348 | goto out; | |
1349 | } | |
c6c8fea2 SE |
1350 | |
1351 | skb = new_skb; | |
1352 | unicast_packet = (struct unicast_packet *)skb->data; | |
1353 | } | |
1354 | ||
1355 | /* decrement ttl */ | |
1356 | unicast_packet->ttl--; | |
1357 | ||
1358 | /* route it */ | |
d0072609 | 1359 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd ML |
1360 | ret = NET_RX_SUCCESS; |
1361 | goto out; | |
c6c8fea2 | 1362 | |
44524fcd ML |
1363 | unlock: |
1364 | rcu_read_unlock(); | |
44524fcd ML |
1365 | out: |
1366 | if (neigh_node) | |
1367 | neigh_node_free_ref(neigh_node); | |
1368 | if (orig_node) | |
7b36e8ee | 1369 | orig_node_free_ref(orig_node); |
44524fcd | 1370 | return ret; |
c6c8fea2 SE |
1371 | } |
1372 | ||
e6c10f43 | 1373 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1374 | { |
1375 | struct unicast_packet *unicast_packet; | |
1376 | int hdr_size = sizeof(struct unicast_packet); | |
1377 | ||
1378 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1379 | return NET_RX_DROP; | |
1380 | ||
1381 | unicast_packet = (struct unicast_packet *)skb->data; | |
1382 | ||
1383 | /* packet for me */ | |
1384 | if (is_my_mac(unicast_packet->dest)) { | |
1385 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
1386 | return NET_RX_SUCCESS; | |
1387 | } | |
1388 | ||
7cefb149 | 1389 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1390 | } |
1391 | ||
e6c10f43 | 1392 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1393 | { |
1394 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1395 | struct unicast_frag_packet *unicast_packet; | |
1396 | int hdr_size = sizeof(struct unicast_frag_packet); | |
1397 | struct sk_buff *new_skb = NULL; | |
1398 | int ret; | |
1399 | ||
1400 | if (check_unicast_packet(skb, hdr_size) < 0) | |
1401 | return NET_RX_DROP; | |
1402 | ||
1403 | unicast_packet = (struct unicast_frag_packet *)skb->data; | |
1404 | ||
1405 | /* packet for me */ | |
1406 | if (is_my_mac(unicast_packet->dest)) { | |
1407 | ||
1408 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
1409 | ||
1410 | if (ret == NET_RX_DROP) | |
1411 | return NET_RX_DROP; | |
1412 | ||
1413 | /* packet was buffered for late merge */ | |
1414 | if (!new_skb) | |
1415 | return NET_RX_SUCCESS; | |
1416 | ||
1417 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1418 | sizeof(struct unicast_packet)); | |
1419 | return NET_RX_SUCCESS; | |
1420 | } | |
1421 | ||
7cefb149 | 1422 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1423 | } |
1424 | ||
1425 | ||
e6c10f43 | 1426 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1427 | { |
1428 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1429 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1430 | struct bcast_packet *bcast_packet; |
1431 | struct ethhdr *ethhdr; | |
1432 | int hdr_size = sizeof(struct bcast_packet); | |
f3e0008f | 1433 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1434 | int32_t seq_diff; |
1435 | ||
1436 | /* drop packet if it has not necessary minimum size */ | |
1437 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1438 | goto out; |
c6c8fea2 SE |
1439 | |
1440 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1441 | ||
1442 | /* packet with broadcast indication but unicast recipient */ | |
1443 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1444 | goto out; |
c6c8fea2 SE |
1445 | |
1446 | /* packet with broadcast sender address */ | |
1447 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1448 | goto out; |
c6c8fea2 SE |
1449 | |
1450 | /* ignore broadcasts sent by myself */ | |
1451 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1452 | goto out; |
c6c8fea2 SE |
1453 | |
1454 | bcast_packet = (struct bcast_packet *)skb->data; | |
1455 | ||
1456 | /* ignore broadcasts originated by myself */ | |
1457 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1458 | goto out; |
c6c8fea2 SE |
1459 | |
1460 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1461 | goto out; |
c6c8fea2 | 1462 | |
fb778ea1 | 1463 | rcu_read_lock(); |
7aadf889 | 1464 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1465 | |
1466 | if (!orig_node) | |
1467 | goto rcu_unlock; | |
1468 | ||
fb778ea1 | 1469 | rcu_read_unlock(); |
c6c8fea2 | 1470 | |
f3e0008f | 1471 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1472 | |
1473 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1474 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1475 | ntohl(bcast_packet->seqno))) | |
1476 | goto spin_unlock; | |
c6c8fea2 SE |
1477 | |
1478 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1479 | ||
1480 | /* check whether the packet is old and the host just restarted. */ | |
1481 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1482 | &orig_node->bcast_seqno_reset)) |
1483 | goto spin_unlock; | |
c6c8fea2 SE |
1484 | |
1485 | /* mark broadcast in flood history, update window position | |
1486 | * if required. */ | |
1487 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1488 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1489 | ||
f3e0008f | 1490 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1491 | |
c6c8fea2 SE |
1492 | /* rebroadcast packet */ |
1493 | add_bcast_packet_to_list(bat_priv, skb); | |
1494 | ||
1495 | /* broadcast for me */ | |
1496 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1497 | ret = NET_RX_SUCCESS; |
1498 | goto out; | |
c6c8fea2 | 1499 | |
f3e0008f ML |
1500 | rcu_unlock: |
1501 | rcu_read_unlock(); | |
f3e0008f ML |
1502 | goto out; |
1503 | spin_unlock: | |
1504 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1505 | out: |
1506 | if (orig_node) | |
7b36e8ee | 1507 | orig_node_free_ref(orig_node); |
f3e0008f | 1508 | return ret; |
c6c8fea2 SE |
1509 | } |
1510 | ||
e6c10f43 | 1511 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1512 | { |
1513 | struct vis_packet *vis_packet; | |
1514 | struct ethhdr *ethhdr; | |
1515 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1516 | int hdr_size = sizeof(struct vis_packet); | |
1517 | ||
1518 | /* keep skb linear */ | |
1519 | if (skb_linearize(skb) < 0) | |
1520 | return NET_RX_DROP; | |
1521 | ||
1522 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1523 | return NET_RX_DROP; | |
1524 | ||
1525 | vis_packet = (struct vis_packet *)skb->data; | |
1526 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1527 | ||
1528 | /* not for me */ | |
1529 | if (!is_my_mac(ethhdr->h_dest)) | |
1530 | return NET_RX_DROP; | |
1531 | ||
1532 | /* ignore own packets */ | |
1533 | if (is_my_mac(vis_packet->vis_orig)) | |
1534 | return NET_RX_DROP; | |
1535 | ||
1536 | if (is_my_mac(vis_packet->sender_orig)) | |
1537 | return NET_RX_DROP; | |
1538 | ||
1539 | switch (vis_packet->vis_type) { | |
1540 | case VIS_TYPE_SERVER_SYNC: | |
1541 | receive_server_sync_packet(bat_priv, vis_packet, | |
1542 | skb_headlen(skb)); | |
1543 | break; | |
1544 | ||
1545 | case VIS_TYPE_CLIENT_UPDATE: | |
1546 | receive_client_update_packet(bat_priv, vis_packet, | |
1547 | skb_headlen(skb)); | |
1548 | break; | |
1549 | ||
1550 | default: /* ignore unknown packet */ | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | /* We take a copy of the data in the packet, so we should | |
1555 | always free the skbuf. */ | |
1556 | return NET_RX_DROP; | |
1557 | } |