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5beef3c9 | 1 | /* |
9b6d10b7 | 2 | * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors: |
5beef3c9 AL |
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 | ||
5beef3c9 AL |
22 | #include "main.h" |
23 | #include "routing.h" | |
5beef3c9 | 24 | #include "send.h" |
8a2e042c | 25 | #include "hash.h" |
5beef3c9 AL |
26 | #include "soft-interface.h" |
27 | #include "hard-interface.h" | |
c4121432 | 28 | #include "icmp_socket.h" |
5beef3c9 | 29 | #include "translation-table.h" |
8a2e042c | 30 | #include "originator.h" |
5beef3c9 | 31 | #include "types.h" |
5beef3c9 AL |
32 | #include "ring_buffer.h" |
33 | #include "vis.h" | |
34 | #include "aggregation.h" | |
5beef3c9 | 35 | |
42fa1b92 | 36 | static DECLARE_WAIT_QUEUE_HEAD(thread_wait); |
5beef3c9 | 37 | |
5beef3c9 AL |
38 | void slide_own_bcast_window(struct batman_if *batman_if) |
39 | { | |
b6c35976 | 40 | HASHIT(hashit); |
5beef3c9 | 41 | struct orig_node *orig_node; |
4efe0b06 | 42 | TYPE_OF_WORD *word; |
e7017195 | 43 | unsigned long flags; |
5beef3c9 | 44 | |
e7017195 | 45 | spin_lock_irqsave(&orig_hash_lock, flags); |
5beef3c9 | 46 | |
b6c35976 SW |
47 | while (hash_iterate(orig_hash, &hashit)) { |
48 | orig_node = hashit.bucket->data; | |
4efe0b06 | 49 | word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]); |
5beef3c9 | 50 | |
4efe0b06 AL |
51 | bit_get_packet(word, 1, 0); |
52 | orig_node->bcast_own_sum[batman_if->if_num] = | |
53 | bit_packet_count(word); | |
5beef3c9 AL |
54 | } |
55 | ||
e7017195 | 56 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
5beef3c9 AL |
57 | } |
58 | ||
4efe0b06 AL |
59 | static void update_HNA(struct orig_node *orig_node, |
60 | unsigned char *hna_buff, int hna_buff_len) | |
5beef3c9 | 61 | { |
4efe0b06 AL |
62 | if ((hna_buff_len != orig_node->hna_buff_len) || |
63 | ((hna_buff_len > 0) && | |
64 | (orig_node->hna_buff_len > 0) && | |
65 | (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { | |
5beef3c9 | 66 | |
4efe0b06 AL |
67 | if (orig_node->hna_buff_len > 0) |
68 | hna_global_del_orig(orig_node, | |
69 | "originator changed hna"); | |
5beef3c9 | 70 | |
4efe0b06 | 71 | if ((hna_buff_len > 0) && (hna_buff != NULL)) |
5beef3c9 | 72 | hna_global_add_orig(orig_node, hna_buff, hna_buff_len); |
4efe0b06 AL |
73 | } |
74 | } | |
5beef3c9 | 75 | |
4efe0b06 AL |
76 | static void update_route(struct orig_node *orig_node, |
77 | struct neigh_node *neigh_node, | |
78 | unsigned char *hna_buff, int hna_buff_len) | |
79 | { | |
84ec0864 ML |
80 | /* FIXME: each orig_node->batman_if will be attached to a softif */ |
81 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
82 | ||
4efe0b06 AL |
83 | /* route deleted */ |
84 | if ((orig_node->router != NULL) && (neigh_node == NULL)) { | |
5beef3c9 | 85 | |
84ec0864 | 86 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
b9b27e4e | 87 | orig_node->orig); |
4efe0b06 | 88 | hna_global_del_orig(orig_node, "originator timed out"); |
5beef3c9 | 89 | |
4efe0b06 AL |
90 | /* route added */ |
91 | } else if ((orig_node->router == NULL) && (neigh_node != NULL)) { | |
5beef3c9 | 92 | |
84ec0864 | 93 | bat_dbg(DBG_ROUTES, bat_priv, |
b9b27e4e AL |
94 | "Adding route towards: %pM (via %pM)\n", |
95 | orig_node->orig, neigh_node->addr); | |
4efe0b06 AL |
96 | hna_global_add_orig(orig_node, hna_buff, hna_buff_len); |
97 | ||
98 | /* route changed */ | |
5beef3c9 | 99 | } else { |
84ec0864 | 100 | bat_dbg(DBG_ROUTES, bat_priv, |
6d45d8df SE |
101 | "Changing route towards: %pM " |
102 | "(now via %pM - was via %pM)\n", | |
103 | orig_node->orig, neigh_node->addr, | |
104 | orig_node->router->addr); | |
4efe0b06 | 105 | } |
5beef3c9 | 106 | |
4efe0b06 AL |
107 | orig_node->router = neigh_node; |
108 | } | |
5beef3c9 | 109 | |
5beef3c9 | 110 | |
8a2e042c | 111 | void update_routes(struct orig_node *orig_node, |
4efe0b06 AL |
112 | struct neigh_node *neigh_node, |
113 | unsigned char *hna_buff, int hna_buff_len) | |
114 | { | |
5beef3c9 | 115 | |
4efe0b06 AL |
116 | if (orig_node == NULL) |
117 | return; | |
118 | ||
119 | if (orig_node->router != neigh_node) | |
120 | update_route(orig_node, neigh_node, hna_buff, hna_buff_len); | |
121 | /* may be just HNA changed */ | |
122 | else | |
123 | update_HNA(orig_node, hna_buff, hna_buff_len); | |
5beef3c9 AL |
124 | } |
125 | ||
6e0e9388 | 126 | static int is_bidirectional_neigh(struct orig_node *orig_node, |
4efe0b06 AL |
127 | struct orig_node *orig_neigh_node, |
128 | struct batman_packet *batman_packet, | |
129 | struct batman_if *if_incoming) | |
5beef3c9 | 130 | { |
84ec0864 ML |
131 | /* FIXME: each orig_node->batman_if will be attached to a softif */ |
132 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
5beef3c9 | 133 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
5beef3c9 AL |
134 | unsigned char total_count; |
135 | ||
5beef3c9 | 136 | if (orig_node == orig_neigh_node) { |
4efe0b06 AL |
137 | list_for_each_entry(tmp_neigh_node, |
138 | &orig_node->neigh_list, | |
139 | list) { | |
5beef3c9 | 140 | |
4efe0b06 AL |
141 | if (compare_orig(tmp_neigh_node->addr, |
142 | orig_neigh_node->orig) && | |
143 | (tmp_neigh_node->if_incoming == if_incoming)) | |
5beef3c9 AL |
144 | neigh_node = tmp_neigh_node; |
145 | } | |
146 | ||
c4bf05d3 | 147 | if (!neigh_node) |
4efe0b06 AL |
148 | neigh_node = create_neighbor(orig_node, |
149 | orig_neigh_node, | |
150 | orig_neigh_node->orig, | |
151 | if_incoming); | |
c4bf05d3 SW |
152 | /* create_neighbor failed, return 0 */ |
153 | if (!neigh_node) | |
154 | return 0; | |
5beef3c9 AL |
155 | |
156 | neigh_node->last_valid = jiffies; | |
157 | } else { | |
158 | /* find packet count of corresponding one hop neighbor */ | |
4efe0b06 AL |
159 | list_for_each_entry(tmp_neigh_node, |
160 | &orig_neigh_node->neigh_list, list) { | |
5beef3c9 | 161 | |
4efe0b06 AL |
162 | if (compare_orig(tmp_neigh_node->addr, |
163 | orig_neigh_node->orig) && | |
164 | (tmp_neigh_node->if_incoming == if_incoming)) | |
5beef3c9 AL |
165 | neigh_node = tmp_neigh_node; |
166 | } | |
167 | ||
c4bf05d3 | 168 | if (!neigh_node) |
4efe0b06 AL |
169 | neigh_node = create_neighbor(orig_neigh_node, |
170 | orig_neigh_node, | |
171 | orig_neigh_node->orig, | |
172 | if_incoming); | |
c4bf05d3 SW |
173 | /* create_neighbor failed, return 0 */ |
174 | if (!neigh_node) | |
175 | return 0; | |
5beef3c9 AL |
176 | } |
177 | ||
178 | orig_node->last_valid = jiffies; | |
179 | ||
180 | /* pay attention to not get a value bigger than 100 % */ | |
4efe0b06 AL |
181 | total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > |
182 | neigh_node->real_packet_count ? | |
183 | neigh_node->real_packet_count : | |
184 | orig_neigh_node->bcast_own_sum[if_incoming->if_num]); | |
5beef3c9 AL |
185 | |
186 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
187 | /* if we receive too few packets it is not considered bidirectional */ | |
4efe0b06 AL |
188 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || |
189 | (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) | |
5beef3c9 AL |
190 | orig_neigh_node->tq_own = 0; |
191 | else | |
4efe0b06 AL |
192 | /* neigh_node->real_packet_count is never zero as we |
193 | * only purge old information when getting new | |
194 | * information */ | |
195 | orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / | |
196 | neigh_node->real_packet_count; | |
5beef3c9 AL |
197 | |
198 | /* | |
4efe0b06 AL |
199 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
200 | * affect the nearly-symmetric links only a little, but | |
201 | * punishes asymmetric links more. This will give a value | |
202 | * between 0 and TQ_MAX_VALUE | |
5beef3c9 | 203 | */ |
4efe0b06 AL |
204 | orig_neigh_node->tq_asym_penalty = |
205 | TQ_MAX_VALUE - | |
206 | (TQ_MAX_VALUE * | |
207 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * | |
208 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * | |
209 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / | |
210 | (TQ_LOCAL_WINDOW_SIZE * | |
211 | TQ_LOCAL_WINDOW_SIZE * | |
212 | TQ_LOCAL_WINDOW_SIZE); | |
213 | ||
214 | batman_packet->tq = ((batman_packet->tq * | |
215 | orig_neigh_node->tq_own * | |
216 | orig_neigh_node->tq_asym_penalty) / | |
208e13e4 | 217 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); |
5beef3c9 | 218 | |
84ec0864 | 219 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df SE |
220 | "bidirectional: " |
221 | "orig = %-15pM neigh = %-15pM => own_bcast = %2i, " | |
222 | "real recv = %2i, local tq: %3i, asym_penalty: %3i, " | |
223 | "total tq: %3i\n", | |
b9b27e4e | 224 | orig_node->orig, orig_neigh_node->orig, total_count, |
4efe0b06 AL |
225 | neigh_node->real_packet_count, orig_neigh_node->tq_own, |
226 | orig_neigh_node->tq_asym_penalty, batman_packet->tq); | |
5beef3c9 | 227 | |
4efe0b06 AL |
228 | /* if link has the minimum required transmission quality |
229 | * consider it bidirectional */ | |
5beef3c9 AL |
230 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) |
231 | return 1; | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
4efe0b06 AL |
236 | static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, |
237 | struct batman_packet *batman_packet, | |
238 | struct batman_if *if_incoming, | |
239 | unsigned char *hna_buff, int hna_buff_len, | |
240 | char is_duplicate) | |
5beef3c9 | 241 | { |
84ec0864 ML |
242 | /* FIXME: get bat_priv */ |
243 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
5beef3c9 AL |
244 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
245 | int tmp_hna_buff_len; | |
246 | ||
84ec0864 | 247 | bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " |
6d45d8df | 248 | "Searching and updating originator entry of received packet\n"); |
5beef3c9 AL |
249 | |
250 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { | |
4efe0b06 AL |
251 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && |
252 | (tmp_neigh_node->if_incoming == if_incoming)) { | |
5beef3c9 AL |
253 | neigh_node = tmp_neigh_node; |
254 | continue; | |
255 | } | |
256 | ||
257 | if (is_duplicate) | |
258 | continue; | |
259 | ||
4efe0b06 AL |
260 | ring_buffer_set(tmp_neigh_node->tq_recv, |
261 | &tmp_neigh_node->tq_index, 0); | |
262 | tmp_neigh_node->tq_avg = | |
263 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
5beef3c9 AL |
264 | } |
265 | ||
c4bf05d3 SW |
266 | if (!neigh_node) { |
267 | struct orig_node *orig_tmp; | |
268 | ||
269 | orig_tmp = get_orig_node(ethhdr->h_source); | |
270 | if (!orig_tmp) | |
271 | return; | |
272 | ||
4efe0b06 | 273 | neigh_node = create_neighbor(orig_node, |
c4bf05d3 | 274 | orig_tmp, |
4efe0b06 | 275 | ethhdr->h_source, if_incoming); |
c4bf05d3 SW |
276 | if (!neigh_node) |
277 | return; | |
278 | } else | |
84ec0864 | 279 | bat_dbg(DBG_BATMAN, bat_priv, |
5ea84fa3 | 280 | "Updating existing last-hop neighbor of originator\n"); |
5beef3c9 AL |
281 | |
282 | orig_node->flags = batman_packet->flags; | |
283 | neigh_node->last_valid = jiffies; | |
284 | ||
4efe0b06 AL |
285 | ring_buffer_set(neigh_node->tq_recv, |
286 | &neigh_node->tq_index, | |
287 | batman_packet->tq); | |
5beef3c9 AL |
288 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); |
289 | ||
290 | if (!is_duplicate) { | |
291 | orig_node->last_ttl = batman_packet->ttl; | |
292 | neigh_node->last_ttl = batman_packet->ttl; | |
293 | } | |
294 | ||
4efe0b06 AL |
295 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
296 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); | |
5beef3c9 | 297 | |
4efe0b06 AL |
298 | /* if this neighbor already is our next hop there is nothing |
299 | * to change */ | |
5beef3c9 AL |
300 | if (orig_node->router == neigh_node) |
301 | goto update_hna; | |
302 | ||
303 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
304 | if ((orig_node->router) && | |
305 | (orig_node->router->tq_avg > neigh_node->tq_avg)) | |
306 | goto update_hna; | |
307 | ||
4efe0b06 AL |
308 | /* if the TQ is the same and the link not more symetric we |
309 | * won't consider it either */ | |
5beef3c9 AL |
310 | if ((orig_node->router) && |
311 | ((neigh_node->tq_avg == orig_node->router->tq_avg) && | |
4efe0b06 AL |
312 | (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] |
313 | >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) | |
5beef3c9 AL |
314 | goto update_hna; |
315 | ||
316 | update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); | |
317 | return; | |
318 | ||
319 | update_hna: | |
320 | update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); | |
5beef3c9 AL |
321 | } |
322 | ||
f94cee24 SW |
323 | /* checks whether the host restarted and is in the protection time. |
324 | * returns: | |
325 | * 0 if the packet is to be accepted | |
326 | * 1 if the packet is to be ignored. | |
327 | */ | |
cf2d72ec | 328 | static int window_protected(int32_t seq_num_diff, |
f94cee24 SW |
329 | unsigned long *last_reset) |
330 | { | |
84ec0864 ML |
331 | /* FIXME: each orig_node->batman_if will be attached to a softif */ |
332 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
333 | ||
f94cee24 SW |
334 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) |
335 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
336 | if (time_after(jiffies, *last_reset + | |
337 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
338 | ||
339 | *last_reset = jiffies; | |
84ec0864 | 340 | bat_dbg(DBG_BATMAN, bat_priv, |
f94cee24 SW |
341 | "old packet received, start protection\n"); |
342 | ||
343 | return 0; | |
344 | } else | |
345 | return 1; | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
350 | /* processes a batman packet for all interfaces, adjusts the sequence number and | |
351 | * finds out whether it is a duplicate. | |
352 | * returns: | |
353 | * 1 the packet is a duplicate | |
354 | * 0 the packet has not yet been received | |
355 | * -1 the packet is old and has been received while the seqno window | |
356 | * was protected. Caller should drop it. | |
357 | */ | |
4efe0b06 AL |
358 | static char count_real_packets(struct ethhdr *ethhdr, |
359 | struct batman_packet *batman_packet, | |
360 | struct batman_if *if_incoming) | |
5beef3c9 | 361 | { |
84ec0864 ML |
362 | /* FIXME: each orig_node->batman_if will be attached to a softif */ |
363 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
5beef3c9 AL |
364 | struct orig_node *orig_node; |
365 | struct neigh_node *tmp_neigh_node; | |
366 | char is_duplicate = 0; | |
cf2d72ec | 367 | int32_t seq_diff; |
f94cee24 SW |
368 | int need_update = 0; |
369 | int set_mark; | |
5beef3c9 AL |
370 | |
371 | orig_node = get_orig_node(batman_packet->orig); | |
372 | if (orig_node == NULL) | |
373 | return 0; | |
374 | ||
f94cee24 SW |
375 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; |
376 | ||
377 | /* signalize caller that the packet is to be dropped. */ | |
378 | if (window_protected(seq_diff, &orig_node->batman_seqno_reset)) | |
379 | return -1; | |
380 | ||
5beef3c9 AL |
381 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { |
382 | ||
f94cee24 | 383 | is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, |
4efe0b06 AL |
384 | orig_node->last_real_seqno, |
385 | batman_packet->seqno); | |
f94cee24 | 386 | |
4efe0b06 AL |
387 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && |
388 | (tmp_neigh_node->if_incoming == if_incoming)) | |
f94cee24 | 389 | set_mark = 1; |
5beef3c9 | 390 | else |
f94cee24 SW |
391 | set_mark = 0; |
392 | ||
393 | /* if the window moved, set the update flag. */ | |
394 | need_update |= bit_get_packet(tmp_neigh_node->real_bits, | |
395 | seq_diff, set_mark); | |
5beef3c9 | 396 | |
4efe0b06 AL |
397 | tmp_neigh_node->real_packet_count = |
398 | bit_packet_count(tmp_neigh_node->real_bits); | |
5beef3c9 AL |
399 | } |
400 | ||
f94cee24 | 401 | if (need_update) { |
84ec0864 ML |
402 | bat_dbg(DBG_BATMAN, bat_priv, |
403 | "updating last_seqno: old %d, new %d\n", | |
bad2239e | 404 | orig_node->last_real_seqno, batman_packet->seqno); |
5beef3c9 AL |
405 | orig_node->last_real_seqno = batman_packet->seqno; |
406 | } | |
407 | ||
408 | return is_duplicate; | |
409 | } | |
410 | ||
e35fd5ec SW |
411 | /* copy primary address for bonding */ |
412 | static void mark_bonding_address(struct bat_priv *bat_priv, | |
413 | struct orig_node *orig_node, | |
414 | struct orig_node *orig_neigh_node, | |
415 | struct batman_packet *batman_packet) | |
416 | ||
417 | { | |
e35fd5ec SW |
418 | if (batman_packet->flags & PRIMARIES_FIRST_HOP) |
419 | memcpy(orig_neigh_node->primary_addr, | |
420 | orig_node->orig, ETH_ALEN); | |
421 | ||
422 | return; | |
423 | } | |
424 | ||
425 | /* mark possible bond.candidates in the neighbor list */ | |
426 | void update_bonding_candidates(struct bat_priv *bat_priv, | |
427 | struct orig_node *orig_node) | |
428 | { | |
429 | int candidates; | |
430 | int interference_candidate; | |
431 | int best_tq; | |
432 | struct neigh_node *tmp_neigh_node, *tmp_neigh_node2; | |
433 | struct neigh_node *first_candidate, *last_candidate; | |
434 | ||
e35fd5ec SW |
435 | /* update the candidates for this originator */ |
436 | if (!orig_node->router) { | |
437 | orig_node->bond.candidates = 0; | |
438 | return; | |
439 | } | |
440 | ||
441 | best_tq = orig_node->router->tq_avg; | |
442 | ||
443 | /* update bond.candidates */ | |
444 | ||
445 | candidates = 0; | |
446 | ||
447 | /* mark other nodes which also received "PRIMARIES FIRST HOP" packets | |
448 | * as "bonding partner" */ | |
449 | ||
450 | /* first, zero the list */ | |
451 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { | |
452 | tmp_neigh_node->next_bond_candidate = NULL; | |
453 | } | |
454 | ||
455 | first_candidate = NULL; | |
456 | last_candidate = NULL; | |
457 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { | |
458 | ||
459 | /* only consider if it has the same primary address ... */ | |
460 | if (memcmp(orig_node->orig, | |
461 | tmp_neigh_node->orig_node->primary_addr, | |
462 | ETH_ALEN) != 0) | |
463 | continue; | |
464 | ||
465 | /* ... and is good enough to be considered */ | |
466 | if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) | |
467 | continue; | |
468 | ||
469 | /* check if we have another candidate with the same | |
470 | * mac address or interface. If we do, we won't | |
471 | * select this candidate because of possible interference. */ | |
472 | ||
473 | interference_candidate = 0; | |
474 | list_for_each_entry(tmp_neigh_node2, | |
475 | &orig_node->neigh_list, list) { | |
476 | ||
477 | if (tmp_neigh_node2 == tmp_neigh_node) | |
478 | continue; | |
479 | ||
480 | /* we only care if the other candidate is even | |
481 | * considered as candidate. */ | |
482 | if (tmp_neigh_node2->next_bond_candidate == NULL) | |
483 | continue; | |
484 | ||
485 | ||
486 | if ((tmp_neigh_node->if_incoming == | |
487 | tmp_neigh_node2->if_incoming) | |
488 | || (memcmp(tmp_neigh_node->addr, | |
489 | tmp_neigh_node2->addr, ETH_ALEN) == 0)) { | |
490 | ||
491 | interference_candidate = 1; | |
492 | break; | |
493 | } | |
494 | } | |
495 | /* don't care further if it is an interference candidate */ | |
496 | if (interference_candidate) | |
497 | continue; | |
498 | ||
499 | if (first_candidate == NULL) { | |
500 | first_candidate = tmp_neigh_node; | |
501 | tmp_neigh_node->next_bond_candidate = first_candidate; | |
502 | } else | |
503 | tmp_neigh_node->next_bond_candidate = last_candidate; | |
504 | ||
505 | last_candidate = tmp_neigh_node; | |
506 | ||
507 | candidates++; | |
508 | } | |
509 | ||
510 | if (candidates > 0) { | |
511 | first_candidate->next_bond_candidate = last_candidate; | |
512 | orig_node->bond.selected = first_candidate; | |
513 | } | |
514 | ||
515 | orig_node->bond.candidates = candidates; | |
516 | } | |
517 | ||
4efe0b06 | 518 | void receive_bat_packet(struct ethhdr *ethhdr, |
e7017195 SW |
519 | struct batman_packet *batman_packet, |
520 | unsigned char *hna_buff, int hna_buff_len, | |
521 | struct batman_if *if_incoming) | |
5beef3c9 | 522 | { |
e35fd5ec SW |
523 | /* FIXME: each orig_node->batman_if will be attached to a softif */ |
524 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
5beef3c9 AL |
525 | struct batman_if *batman_if; |
526 | struct orig_node *orig_neigh_node, *orig_node; | |
5beef3c9 | 527 | char has_directlink_flag; |
4efe0b06 AL |
528 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; |
529 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
530 | char is_duplicate; | |
cf2d72ec | 531 | uint32_t if_incoming_seqno; |
5beef3c9 | 532 | |
4efe0b06 AL |
533 | /* Silently drop when the batman packet is actually not a |
534 | * correct packet. | |
5beef3c9 AL |
535 | * |
536 | * This might happen if a packet is padded (e.g. Ethernet has a | |
537 | * minimum frame length of 64 byte) and the aggregation interprets | |
538 | * it as an additional length. | |
539 | * | |
4efe0b06 AL |
540 | * TODO: A more sane solution would be to have a bit in the |
541 | * batman_packet to detect whether the packet is the last | |
542 | * packet in an aggregation. Here we expect that the padding | |
543 | * is always zero (or not 0x01) | |
5beef3c9 AL |
544 | */ |
545 | if (batman_packet->packet_type != BAT_PACKET) | |
546 | return; | |
547 | ||
548 | /* could be changed by schedule_own_packet() */ | |
549 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
550 | ||
5beef3c9 AL |
551 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
552 | ||
4efe0b06 AL |
553 | is_single_hop_neigh = (compare_orig(ethhdr->h_source, |
554 | batman_packet->orig) ? 1 : 0); | |
5beef3c9 | 555 | |
84ec0864 ML |
556 | bat_dbg(DBG_BATMAN, bat_priv, |
557 | "Received BATMAN packet via NB: %pM, IF: %s [%s] " | |
6d45d8df SE |
558 | "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " |
559 | "TTL %d, V %d, IDF %d)\n", | |
b9b27e4e AL |
560 | ethhdr->h_source, if_incoming->dev, if_incoming->addr_str, |
561 | batman_packet->orig, batman_packet->prev_sender, | |
562 | batman_packet->seqno, batman_packet->tq, batman_packet->ttl, | |
563 | batman_packet->version, has_directlink_flag); | |
5beef3c9 AL |
564 | |
565 | list_for_each_entry_rcu(batman_if, &if_list, list) { | |
208e13e4 | 566 | if (batman_if->if_status != IF_ACTIVE) |
5beef3c9 AL |
567 | continue; |
568 | ||
4efe0b06 AL |
569 | if (compare_orig(ethhdr->h_source, |
570 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
571 | is_my_addr = 1; |
572 | ||
4efe0b06 AL |
573 | if (compare_orig(batman_packet->orig, |
574 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
575 | is_my_orig = 1; |
576 | ||
4efe0b06 AL |
577 | if (compare_orig(batman_packet->prev_sender, |
578 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
579 | is_my_oldorig = 1; |
580 | ||
6e0e9388 | 581 | if (compare_orig(ethhdr->h_source, broadcast_addr)) |
5beef3c9 AL |
582 | is_broadcast = 1; |
583 | } | |
584 | ||
585 | if (batman_packet->version != COMPAT_VERSION) { | |
84ec0864 | 586 | bat_dbg(DBG_BATMAN, bat_priv, |
4efe0b06 AL |
587 | "Drop packet: incompatible batman version (%i)\n", |
588 | batman_packet->version); | |
5beef3c9 AL |
589 | return; |
590 | } | |
591 | ||
592 | if (is_my_addr) { | |
84ec0864 | 593 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df SE |
594 | "Drop packet: received my own broadcast (sender: %pM" |
595 | ")\n", | |
b9b27e4e | 596 | ethhdr->h_source); |
5beef3c9 AL |
597 | return; |
598 | } | |
599 | ||
600 | if (is_broadcast) { | |
84ec0864 | 601 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
6d45d8df SE |
602 | "ignoring all packets with broadcast source addr (sender: %pM" |
603 | ")\n", ethhdr->h_source); | |
5beef3c9 AL |
604 | return; |
605 | } | |
606 | ||
607 | if (is_my_orig) { | |
4efe0b06 AL |
608 | TYPE_OF_WORD *word; |
609 | int offset; | |
610 | ||
5beef3c9 AL |
611 | orig_neigh_node = get_orig_node(ethhdr->h_source); |
612 | ||
c4bf05d3 SW |
613 | if (!orig_neigh_node) |
614 | return; | |
615 | ||
5ea84fa3 | 616 | /* neighbor has to indicate direct link and it has to |
4efe0b06 AL |
617 | * come via the corresponding interface */ |
618 | /* if received seqno equals last send seqno save new | |
619 | * seqno for bidirectional check */ | |
620 | if (has_directlink_flag && | |
621 | compare_orig(if_incoming->net_dev->dev_addr, | |
622 | batman_packet->orig) && | |
623 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { | |
624 | offset = if_incoming->if_num * NUM_WORDS; | |
625 | word = &(orig_neigh_node->bcast_own[offset]); | |
626 | bit_mark(word, 0); | |
627 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
628 | bit_packet_count(word); | |
5beef3c9 AL |
629 | } |
630 | ||
84ec0864 | 631 | bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " |
6d45d8df | 632 | "originator packet from myself (via neighbor)\n"); |
5beef3c9 AL |
633 | return; |
634 | } | |
635 | ||
5beef3c9 | 636 | if (is_my_oldorig) { |
84ec0864 | 637 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df SE |
638 | "Drop packet: ignoring all rebroadcast echos (sender: " |
639 | "%pM)\n", ethhdr->h_source); | |
5beef3c9 AL |
640 | return; |
641 | } | |
642 | ||
5beef3c9 AL |
643 | orig_node = get_orig_node(batman_packet->orig); |
644 | if (orig_node == NULL) | |
645 | return; | |
646 | ||
f94cee24 SW |
647 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); |
648 | ||
649 | if (is_duplicate == -1) { | |
84ec0864 | 650 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df SE |
651 | "Drop packet: packet within seqno protection time " |
652 | "(sender: %pM)\n", ethhdr->h_source); | |
f94cee24 SW |
653 | return; |
654 | } | |
655 | ||
656 | if (batman_packet->tq == 0) { | |
84ec0864 | 657 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df | 658 | "Drop packet: originator packet with tq equal 0\n"); |
f94cee24 SW |
659 | return; |
660 | } | |
661 | ||
5beef3c9 | 662 | /* avoid temporary routing loops */ |
4efe0b06 AL |
663 | if ((orig_node->router) && |
664 | (orig_node->router->orig_node->router) && | |
665 | (compare_orig(orig_node->router->addr, | |
666 | batman_packet->prev_sender)) && | |
5beef3c9 | 667 | !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && |
4efe0b06 AL |
668 | (compare_orig(orig_node->router->addr, |
669 | orig_node->router->orig_node->router->addr))) { | |
84ec0864 | 670 | bat_dbg(DBG_BATMAN, bat_priv, |
6d45d8df SE |
671 | "Drop packet: ignoring all rebroadcast packets that " |
672 | "may make me loop (sender: %pM)\n", ethhdr->h_source); | |
5beef3c9 AL |
673 | return; |
674 | } | |
675 | ||
4efe0b06 AL |
676 | /* if sender is a direct neighbor the sender mac equals |
677 | * originator mac */ | |
678 | orig_neigh_node = (is_single_hop_neigh ? | |
679 | orig_node : get_orig_node(ethhdr->h_source)); | |
5beef3c9 AL |
680 | if (orig_neigh_node == NULL) |
681 | return; | |
682 | ||
4efe0b06 AL |
683 | /* drop packet if sender is not a direct neighbor and if we |
684 | * don't route towards it */ | |
685 | if (!is_single_hop_neigh && | |
686 | (orig_neigh_node->router == NULL)) { | |
84ec0864 ML |
687 | bat_dbg(DBG_BATMAN, bat_priv, |
688 | "Drop packet: OGM via unknown neighbor!\n"); | |
5beef3c9 AL |
689 | return; |
690 | } | |
691 | ||
6e0e9388 | 692 | is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, |
4efe0b06 | 693 | batman_packet, if_incoming); |
5beef3c9 | 694 | |
4efe0b06 AL |
695 | /* update ranking if it is not a duplicate or has the same |
696 | * seqno and similar ttl as the non-duplicate */ | |
697 | if (is_bidirectional && | |
698 | (!is_duplicate || | |
699 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
700 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
701 | update_orig(orig_node, ethhdr, batman_packet, | |
702 | if_incoming, hna_buff, hna_buff_len, is_duplicate); | |
5beef3c9 | 703 | |
e35fd5ec SW |
704 | mark_bonding_address(bat_priv, orig_node, |
705 | orig_neigh_node, batman_packet); | |
706 | update_bonding_candidates(bat_priv, orig_node); | |
707 | ||
5ea84fa3 | 708 | /* is single hop (direct) neighbor */ |
5beef3c9 AL |
709 | if (is_single_hop_neigh) { |
710 | ||
711 | /* mark direct link on incoming interface */ | |
4efe0b06 AL |
712 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
713 | 1, hna_buff_len, if_incoming); | |
5beef3c9 | 714 | |
84ec0864 | 715 | bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " |
6d45d8df | 716 | "rebroadcast neighbor packet with direct link flag\n"); |
5beef3c9 AL |
717 | return; |
718 | } | |
719 | ||
720 | /* multihop originator */ | |
721 | if (!is_bidirectional) { | |
84ec0864 | 722 | bat_dbg(DBG_BATMAN, bat_priv, |
4efe0b06 | 723 | "Drop packet: not received via bidirectional link\n"); |
5beef3c9 AL |
724 | return; |
725 | } | |
726 | ||
727 | if (is_duplicate) { | |
84ec0864 ML |
728 | bat_dbg(DBG_BATMAN, bat_priv, |
729 | "Drop packet: duplicate packet received\n"); | |
5beef3c9 AL |
730 | return; |
731 | } | |
732 | ||
84ec0864 | 733 | bat_dbg(DBG_BATMAN, bat_priv, |
4efe0b06 AL |
734 | "Forwarding packet: rebroadcast originator packet\n"); |
735 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
736 | 0, hna_buff_len, if_incoming); | |
5beef3c9 AL |
737 | } |
738 | ||
e7017195 SW |
739 | int recv_bat_packet(struct sk_buff *skb, |
740 | struct batman_if *batman_if) | |
5beef3c9 | 741 | { |
e7017195 SW |
742 | struct ethhdr *ethhdr; |
743 | unsigned long flags; | |
f347b873 | 744 | struct sk_buff *skb_old; |
5beef3c9 | 745 | |
e7017195 SW |
746 | /* drop packet if it has not necessary minimum size */ |
747 | if (skb_headlen(skb) < sizeof(struct batman_packet)) | |
748 | return NET_RX_DROP; | |
5beef3c9 | 749 | |
e7017195 | 750 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
5beef3c9 | 751 | |
4efe0b06 AL |
752 | /* packet with broadcast indication but unicast recipient */ |
753 | if (!is_bcast(ethhdr->h_dest)) | |
e7017195 | 754 | return NET_RX_DROP; |
4efe0b06 AL |
755 | |
756 | /* packet with broadcast sender address */ | |
757 | if (is_bcast(ethhdr->h_source)) | |
e7017195 SW |
758 | return NET_RX_DROP; |
759 | ||
e7017195 SW |
760 | /* TODO: we use headlen instead of "length", because |
761 | * only this data is paged in. */ | |
f347b873 SE |
762 | |
763 | /* create a copy of the skb, if needed, to modify it. */ | |
764 | if (!skb_clone_writable(skb, skb_headlen(skb))) { | |
765 | skb_old = skb; | |
766 | skb = skb_copy(skb, GFP_ATOMIC); | |
767 | if (!skb) | |
768 | return NET_RX_DROP; | |
202cfe10 | 769 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
f347b873 SE |
770 | kfree_skb(skb_old); |
771 | } | |
772 | ||
773 | spin_lock_irqsave(&orig_hash_lock, flags); | |
4efe0b06 | 774 | receive_aggr_bat_packet(ethhdr, |
e7017195 SW |
775 | skb->data, |
776 | skb_headlen(skb), | |
4efe0b06 | 777 | batman_if); |
e7017195 SW |
778 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
779 | ||
780 | kfree_skb(skb); | |
781 | return NET_RX_SUCCESS; | |
4efe0b06 AL |
782 | } |
783 | ||
e4cb3720 | 784 | static int recv_my_icmp_packet(struct sk_buff *skb, size_t icmp_len) |
5beef3c9 | 785 | { |
b7a23bce ML |
786 | /* FIXME: each batman_if will be attached to a softif */ |
787 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
5beef3c9 | 788 | struct orig_node *orig_node; |
e4cb3720 | 789 | struct icmp_packet_rr *icmp_packet; |
e7017195 SW |
790 | struct ethhdr *ethhdr; |
791 | struct sk_buff *skb_old; | |
792 | struct batman_if *batman_if; | |
793 | int ret; | |
794 | unsigned long flags; | |
795 | uint8_t dstaddr[ETH_ALEN]; | |
796 | ||
e4cb3720 | 797 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
202cfe10 | 798 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
5beef3c9 | 799 | |
4efe0b06 AL |
800 | /* add data to device queue */ |
801 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
e4cb3720 | 802 | bat_socket_receive_packet(icmp_packet, icmp_len); |
e7017195 | 803 | return NET_RX_DROP; |
5beef3c9 AL |
804 | } |
805 | ||
b7a23bce ML |
806 | if (!bat_priv->primary_if) |
807 | return NET_RX_DROP; | |
808 | ||
4efe0b06 AL |
809 | /* answer echo request (ping) */ |
810 | /* get routing information */ | |
e7017195 | 811 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
812 | orig_node = ((struct orig_node *)hash_find(orig_hash, |
813 | icmp_packet->orig)); | |
e7017195 | 814 | ret = NET_RX_DROP; |
4efe0b06 AL |
815 | |
816 | if ((orig_node != NULL) && | |
4efe0b06 | 817 | (orig_node->router != NULL)) { |
e7017195 SW |
818 | |
819 | /* don't lock while sending the packets ... we therefore | |
820 | * copy the required data before sending */ | |
35bd69d4 | 821 | batman_if = orig_node->router->if_incoming; |
e7017195 SW |
822 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
823 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
824 | ||
825 | /* create a copy of the skb, if needed, to modify it. */ | |
826 | skb_old = NULL; | |
e4cb3720 | 827 | if (!skb_clone_writable(skb, icmp_len)) { |
e7017195 SW |
828 | skb_old = skb; |
829 | skb = skb_copy(skb, GFP_ATOMIC); | |
830 | if (!skb) | |
831 | return NET_RX_DROP; | |
e4cb3720 | 832 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
202cfe10 | 833 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
e7017195 SW |
834 | kfree_skb(skb_old); |
835 | } | |
836 | ||
4efe0b06 | 837 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
b7a23bce ML |
838 | memcpy(icmp_packet->orig, |
839 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
4efe0b06 AL |
840 | icmp_packet->msg_type = ECHO_REPLY; |
841 | icmp_packet->ttl = TTL; | |
842 | ||
e7017195 SW |
843 | send_skb_packet(skb, batman_if, dstaddr); |
844 | ret = NET_RX_SUCCESS; | |
5beef3c9 | 845 | |
e7017195 SW |
846 | } else |
847 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
848 | ||
849 | return ret; | |
4efe0b06 | 850 | } |
5beef3c9 | 851 | |
e4cb3720 | 852 | static int recv_icmp_ttl_exceeded(struct sk_buff *skb, size_t icmp_len) |
4efe0b06 | 853 | { |
b7a23bce ML |
854 | /* FIXME: each batman_if will be attached to a softif */ |
855 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
4efe0b06 | 856 | struct orig_node *orig_node; |
e7017195 SW |
857 | struct icmp_packet *icmp_packet; |
858 | struct ethhdr *ethhdr; | |
859 | struct sk_buff *skb_old; | |
860 | struct batman_if *batman_if; | |
861 | int ret; | |
862 | unsigned long flags; | |
863 | uint8_t dstaddr[ETH_ALEN]; | |
864 | ||
149de2e5 ML |
865 | icmp_packet = (struct icmp_packet *)skb->data; |
866 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 867 | |
4efe0b06 | 868 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
149de2e5 | 869 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
c1641862 SE |
870 | pr_warning("Warning - can't forward icmp packet from %pM to " |
871 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
872 | icmp_packet->dst); | |
e7017195 | 873 | return NET_RX_DROP; |
149de2e5 | 874 | } |
5beef3c9 | 875 | |
b7a23bce ML |
876 | if (!bat_priv->primary_if) |
877 | return NET_RX_DROP; | |
878 | ||
4efe0b06 | 879 | /* get routing information */ |
e7017195 | 880 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
881 | orig_node = ((struct orig_node *) |
882 | hash_find(orig_hash, icmp_packet->orig)); | |
e7017195 | 883 | ret = NET_RX_DROP; |
4efe0b06 AL |
884 | |
885 | if ((orig_node != NULL) && | |
4efe0b06 | 886 | (orig_node->router != NULL)) { |
e7017195 SW |
887 | |
888 | /* don't lock while sending the packets ... we therefore | |
889 | * copy the required data before sending */ | |
35bd69d4 | 890 | batman_if = orig_node->router->if_incoming; |
e7017195 SW |
891 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
892 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
893 | ||
894 | /* create a copy of the skb, if needed, to modify it. */ | |
e4cb3720 | 895 | if (!skb_clone_writable(skb, icmp_len)) { |
e7017195 SW |
896 | skb_old = skb; |
897 | skb = skb_copy(skb, GFP_ATOMIC); | |
898 | if (!skb) | |
899 | return NET_RX_DROP; | |
900 | icmp_packet = (struct icmp_packet *) skb->data; | |
202cfe10 | 901 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
e7017195 SW |
902 | kfree_skb(skb_old); |
903 | } | |
904 | ||
4efe0b06 | 905 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
b7a23bce ML |
906 | memcpy(icmp_packet->orig, |
907 | bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); | |
4efe0b06 AL |
908 | icmp_packet->msg_type = TTL_EXCEEDED; |
909 | icmp_packet->ttl = TTL; | |
910 | ||
e7017195 SW |
911 | send_skb_packet(skb, batman_if, dstaddr); |
912 | ret = NET_RX_SUCCESS; | |
5beef3c9 | 913 | |
e7017195 SW |
914 | } else |
915 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
5beef3c9 | 916 | |
e7017195 | 917 | return ret; |
4efe0b06 | 918 | } |
5beef3c9 | 919 | |
5beef3c9 | 920 | |
e7017195 | 921 | int recv_icmp_packet(struct sk_buff *skb) |
4efe0b06 | 922 | { |
e4cb3720 | 923 | struct icmp_packet_rr *icmp_packet; |
e7017195 | 924 | struct ethhdr *ethhdr; |
4efe0b06 | 925 | struct orig_node *orig_node; |
e7017195 SW |
926 | struct sk_buff *skb_old; |
927 | struct batman_if *batman_if; | |
928 | int hdr_size = sizeof(struct icmp_packet); | |
929 | int ret; | |
930 | unsigned long flags; | |
931 | uint8_t dstaddr[ETH_ALEN]; | |
932 | ||
e4cb3720 DS |
933 | /** |
934 | * we truncate all incoming icmp packets if they don't match our size | |
935 | */ | |
936 | if (skb_headlen(skb) >= sizeof(struct icmp_packet_rr)) | |
937 | hdr_size = sizeof(struct icmp_packet_rr); | |
938 | ||
e7017195 SW |
939 | /* drop packet if it has not necessary minimum size */ |
940 | if (skb_headlen(skb) < hdr_size) | |
941 | return NET_RX_DROP; | |
942 | ||
943 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 944 | |
4efe0b06 AL |
945 | /* packet with unicast indication but broadcast recipient */ |
946 | if (is_bcast(ethhdr->h_dest)) | |
e7017195 | 947 | return NET_RX_DROP; |
5beef3c9 | 948 | |
4efe0b06 AL |
949 | /* packet with broadcast sender address */ |
950 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 951 | return NET_RX_DROP; |
5beef3c9 | 952 | |
4efe0b06 AL |
953 | /* not for me */ |
954 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 955 | return NET_RX_DROP; |
5beef3c9 | 956 | |
e4cb3720 DS |
957 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
958 | ||
959 | /* add record route information if not full */ | |
960 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
961 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
962 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
963 | ethhdr->h_dest, ETH_ALEN); | |
964 | icmp_packet->rr_cur++; | |
965 | } | |
5beef3c9 | 966 | |
4efe0b06 AL |
967 | /* packet for me */ |
968 | if (is_my_mac(icmp_packet->dst)) | |
e4cb3720 | 969 | return recv_my_icmp_packet(skb, hdr_size); |
5beef3c9 | 970 | |
4efe0b06 | 971 | /* TTL exceeded */ |
e7017195 | 972 | if (icmp_packet->ttl < 2) |
e4cb3720 | 973 | return recv_icmp_ttl_exceeded(skb, hdr_size); |
5beef3c9 | 974 | |
e7017195 | 975 | ret = NET_RX_DROP; |
5beef3c9 | 976 | |
4efe0b06 | 977 | /* get routing information */ |
e7017195 | 978 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
979 | orig_node = ((struct orig_node *) |
980 | hash_find(orig_hash, icmp_packet->dst)); | |
5beef3c9 | 981 | |
4efe0b06 | 982 | if ((orig_node != NULL) && |
4efe0b06 | 983 | (orig_node->router != NULL)) { |
5beef3c9 | 984 | |
e7017195 SW |
985 | /* don't lock while sending the packets ... we therefore |
986 | * copy the required data before sending */ | |
35bd69d4 | 987 | batman_if = orig_node->router->if_incoming; |
e7017195 SW |
988 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); |
989 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
990 | ||
991 | /* create a copy of the skb, if needed, to modify it. */ | |
e4cb3720 | 992 | if (!skb_clone_writable(skb, hdr_size)) { |
e7017195 SW |
993 | skb_old = skb; |
994 | skb = skb_copy(skb, GFP_ATOMIC); | |
995 | if (!skb) | |
996 | return NET_RX_DROP; | |
e4cb3720 | 997 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
202cfe10 | 998 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
e7017195 SW |
999 | kfree_skb(skb_old); |
1000 | } | |
1001 | ||
4efe0b06 AL |
1002 | /* decrement ttl */ |
1003 | icmp_packet->ttl--; | |
5beef3c9 | 1004 | |
4efe0b06 | 1005 | /* route it */ |
e7017195 SW |
1006 | send_skb_packet(skb, batman_if, dstaddr); |
1007 | ret = NET_RX_SUCCESS; | |
1008 | ||
1009 | } else | |
1010 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
1011 | ||
1012 | return ret; | |
4efe0b06 | 1013 | } |
5beef3c9 | 1014 | |
e35fd5ec SW |
1015 | /* find a suitable router for this originator, and use |
1016 | * bonding if possible. */ | |
11f79dec SW |
1017 | struct neigh_node *find_router(struct orig_node *orig_node, |
1018 | struct batman_if *recv_if) | |
e35fd5ec SW |
1019 | { |
1020 | /* FIXME: each orig_node->batman_if will be attached to a softif */ | |
1021 | struct bat_priv *bat_priv = netdev_priv(soft_device); | |
1022 | struct orig_node *primary_orig_node; | |
1023 | struct orig_node *router_orig; | |
11f79dec | 1024 | struct neigh_node *router, *first_candidate, *best_router; |
e35fd5ec | 1025 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
11f79dec | 1026 | int bonding_enabled; |
e35fd5ec SW |
1027 | |
1028 | if (!orig_node) | |
1029 | return NULL; | |
1030 | ||
1031 | if (!orig_node->router) | |
1032 | return NULL; | |
1033 | ||
11f79dec SW |
1034 | /* without bonding, the first node should |
1035 | * always choose the default router. */ | |
1036 | ||
1037 | bonding_enabled = atomic_read(&bat_priv->bonding_enabled); | |
1038 | if (!bonding_enabled && (recv_if == NULL)) | |
1039 | return orig_node->router; | |
e35fd5ec SW |
1040 | |
1041 | router_orig = orig_node->router->orig_node; | |
1042 | ||
1043 | /* if we have something in the primary_addr, we can search | |
1044 | * for a potential bonding candidate. */ | |
1045 | if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0) | |
1046 | return orig_node->router; | |
1047 | ||
1048 | /* find the orig_node which has the primary interface. might | |
1049 | * even be the same as our router_orig in many cases */ | |
1050 | ||
1051 | if (memcmp(router_orig->primary_addr, | |
1052 | router_orig->orig, ETH_ALEN) == 0) { | |
1053 | primary_orig_node = router_orig; | |
1054 | } else { | |
1055 | primary_orig_node = hash_find(orig_hash, | |
1056 | router_orig->primary_addr); | |
1057 | if (!primary_orig_node) | |
1058 | return orig_node->router; | |
1059 | } | |
1060 | ||
1061 | /* with less than 2 candidates, we can't do any | |
1062 | * bonding and prefer the original router. */ | |
1063 | ||
1064 | if (primary_orig_node->bond.candidates < 2) | |
1065 | return orig_node->router; | |
1066 | ||
e35fd5ec | 1067 | |
11f79dec SW |
1068 | /* all nodes between should choose a candidate which |
1069 | * is is not on the interface where the packet came | |
1070 | * in. */ | |
1071 | first_candidate = primary_orig_node->bond.selected; | |
1072 | router = first_candidate; | |
1073 | ||
1074 | if (bonding_enabled) { | |
1075 | /* in the bonding case, send the packets in a round | |
1076 | * robin fashion over the remaining interfaces. */ | |
1077 | do { | |
1078 | /* recv_if == NULL on the first node. */ | |
1079 | if (router->if_incoming != recv_if) | |
1080 | break; | |
1081 | ||
1082 | router = router->next_bond_candidate; | |
1083 | } while (router != first_candidate); | |
1084 | ||
1085 | primary_orig_node->bond.selected = router->next_bond_candidate; | |
e35fd5ec | 1086 | |
11f79dec SW |
1087 | } else { |
1088 | /* if bonding is disabled, use the best of the | |
1089 | * remaining candidates which are not using | |
1090 | * this interface. */ | |
1091 | best_router = first_candidate; | |
1092 | ||
1093 | do { | |
1094 | /* recv_if == NULL on the first node. */ | |
1095 | if ((router->if_incoming != recv_if) && | |
1096 | (router->tq_avg > best_router->tq_avg)) | |
1097 | best_router = router; | |
1098 | ||
1099 | router = router->next_bond_candidate; | |
1100 | } while (router != first_candidate); | |
1101 | ||
1102 | router = best_router; | |
1103 | } | |
e35fd5ec SW |
1104 | |
1105 | return router; | |
1106 | } | |
1107 | ||
11f79dec | 1108 | int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) |
4efe0b06 AL |
1109 | { |
1110 | struct unicast_packet *unicast_packet; | |
4efe0b06 | 1111 | struct orig_node *orig_node; |
e35fd5ec | 1112 | struct neigh_node *router; |
e7017195 SW |
1113 | struct ethhdr *ethhdr; |
1114 | struct batman_if *batman_if; | |
1115 | struct sk_buff *skb_old; | |
1116 | uint8_t dstaddr[ETH_ALEN]; | |
1117 | int hdr_size = sizeof(struct unicast_packet); | |
e7017195 SW |
1118 | unsigned long flags; |
1119 | ||
1120 | /* drop packet if it has not necessary minimum size */ | |
1121 | if (skb_headlen(skb) < hdr_size) | |
1122 | return NET_RX_DROP; | |
1123 | ||
1124 | ethhdr = (struct ethhdr *) skb_mac_header(skb); | |
5beef3c9 | 1125 | |
4efe0b06 AL |
1126 | /* packet with unicast indication but broadcast recipient */ |
1127 | if (is_bcast(ethhdr->h_dest)) | |
e7017195 | 1128 | return NET_RX_DROP; |
5beef3c9 | 1129 | |
4efe0b06 AL |
1130 | /* packet with broadcast sender address */ |
1131 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 1132 | return NET_RX_DROP; |
5beef3c9 | 1133 | |
4efe0b06 AL |
1134 | /* not for me */ |
1135 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 1136 | return NET_RX_DROP; |
5beef3c9 | 1137 | |
e7017195 | 1138 | unicast_packet = (struct unicast_packet *) skb->data; |
5beef3c9 | 1139 | |
4efe0b06 AL |
1140 | /* packet for me */ |
1141 | if (is_my_mac(unicast_packet->dest)) { | |
e7017195 SW |
1142 | interface_rx(skb, hdr_size); |
1143 | return NET_RX_SUCCESS; | |
4efe0b06 | 1144 | } |
5beef3c9 | 1145 | |
4efe0b06 AL |
1146 | /* TTL exceeded */ |
1147 | if (unicast_packet->ttl < 2) { | |
c1641862 SE |
1148 | pr_warning("Warning - can't forward unicast packet from %pM to " |
1149 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
1150 | unicast_packet->dest); | |
e7017195 | 1151 | return NET_RX_DROP; |
4efe0b06 | 1152 | } |
5beef3c9 | 1153 | |
4efe0b06 | 1154 | /* get routing information */ |
e7017195 | 1155 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
1156 | orig_node = ((struct orig_node *) |
1157 | hash_find(orig_hash, unicast_packet->dest)); | |
1158 | ||
11f79dec | 1159 | router = find_router(orig_node, recv_if); |
e7017195 | 1160 | |
e35fd5ec | 1161 | if (!router) { |
e7017195 | 1162 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
e35fd5ec SW |
1163 | return NET_RX_DROP; |
1164 | } | |
e7017195 | 1165 | |
e35fd5ec SW |
1166 | /* don't lock while sending the packets ... we therefore |
1167 | * copy the required data before sending */ | |
4efe0b06 | 1168 | |
e35fd5ec SW |
1169 | batman_if = router->if_incoming; |
1170 | memcpy(dstaddr, router->addr, ETH_ALEN); | |
e7017195 | 1171 | |
e35fd5ec | 1172 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
e7017195 | 1173 | |
e35fd5ec SW |
1174 | /* create a copy of the skb, if needed, to modify it. */ |
1175 | if (!skb_clone_writable(skb, sizeof(struct unicast_packet))) { | |
1176 | skb_old = skb; | |
1177 | skb = skb_copy(skb, GFP_ATOMIC); | |
1178 | if (!skb) | |
1179 | return NET_RX_DROP; | |
1180 | unicast_packet = (struct unicast_packet *) skb->data; | |
1181 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1182 | kfree_skb(skb_old); | |
1183 | } | |
1184 | ||
1185 | /* decrement ttl */ | |
1186 | unicast_packet->ttl--; | |
1187 | ||
1188 | /* route it */ | |
1189 | send_skb_packet(skb, batman_if, dstaddr); | |
1190 | ||
1191 | return NET_RX_SUCCESS; | |
4efe0b06 | 1192 | } |
5beef3c9 | 1193 | |
e7017195 | 1194 | int recv_bcast_packet(struct sk_buff *skb) |
4efe0b06 AL |
1195 | { |
1196 | struct orig_node *orig_node; | |
1197 | struct bcast_packet *bcast_packet; | |
e7017195 SW |
1198 | struct ethhdr *ethhdr; |
1199 | int hdr_size = sizeof(struct bcast_packet); | |
cf2d72ec | 1200 | int32_t seq_diff; |
e7017195 SW |
1201 | unsigned long flags; |
1202 | ||
1203 | /* drop packet if it has not necessary minimum size */ | |
1204 | if (skb_headlen(skb) < hdr_size) | |
1205 | return NET_RX_DROP; | |
1206 | ||
1207 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 1208 | |
4efe0b06 AL |
1209 | /* packet with broadcast indication but unicast recipient */ |
1210 | if (!is_bcast(ethhdr->h_dest)) | |
e7017195 | 1211 | return NET_RX_DROP; |
5beef3c9 | 1212 | |
4efe0b06 AL |
1213 | /* packet with broadcast sender address */ |
1214 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 1215 | return NET_RX_DROP; |
5beef3c9 | 1216 | |
4efe0b06 AL |
1217 | /* ignore broadcasts sent by myself */ |
1218 | if (is_my_mac(ethhdr->h_source)) | |
e7017195 | 1219 | return NET_RX_DROP; |
5beef3c9 | 1220 | |
208e13e4 | 1221 | bcast_packet = (struct bcast_packet *)skb->data; |
5beef3c9 | 1222 | |
4efe0b06 AL |
1223 | /* ignore broadcasts originated by myself */ |
1224 | if (is_my_mac(bcast_packet->orig)) | |
e7017195 | 1225 | return NET_RX_DROP; |
5beef3c9 | 1226 | |
cf2d72ec SW |
1227 | if (bcast_packet->ttl < 2) |
1228 | return NET_RX_DROP; | |
1229 | ||
e7017195 | 1230 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
1231 | orig_node = ((struct orig_node *) |
1232 | hash_find(orig_hash, bcast_packet->orig)); | |
5beef3c9 | 1233 | |
4efe0b06 | 1234 | if (orig_node == NULL) { |
e7017195 SW |
1235 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
1236 | return NET_RX_DROP; | |
4efe0b06 | 1237 | } |
5beef3c9 | 1238 | |
f94cee24 | 1239 | /* check whether the packet is a duplicate */ |
4efe0b06 AL |
1240 | if (get_bit_status(orig_node->bcast_bits, |
1241 | orig_node->last_bcast_seqno, | |
cf2d72ec | 1242 | ntohl(bcast_packet->seqno))) { |
e7017195 SW |
1243 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
1244 | return NET_RX_DROP; | |
4efe0b06 | 1245 | } |
5beef3c9 | 1246 | |
cf2d72ec | 1247 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; |
f94cee24 SW |
1248 | |
1249 | /* check whether the packet is old and the host just restarted. */ | |
1250 | if (window_protected(seq_diff, &orig_node->bcast_seqno_reset)) { | |
1251 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
1252 | return NET_RX_DROP; | |
1253 | } | |
1254 | ||
1255 | /* mark broadcast in flood history, update window position | |
1256 | * if required. */ | |
1257 | if (bit_get_packet(orig_node->bcast_bits, seq_diff, 1)) | |
cf2d72ec | 1258 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
5beef3c9 | 1259 | |
e7017195 | 1260 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
e7017195 SW |
1261 | /* rebroadcast packet */ |
1262 | add_bcast_packet_to_list(skb); | |
5beef3c9 | 1263 | |
4efe0b06 | 1264 | /* broadcast for me */ |
e7017195 | 1265 | interface_rx(skb, hdr_size); |
5beef3c9 | 1266 | |
e7017195 | 1267 | return NET_RX_SUCCESS; |
4efe0b06 | 1268 | } |
5beef3c9 | 1269 | |
e7017195 | 1270 | int recv_vis_packet(struct sk_buff *skb) |
4efe0b06 AL |
1271 | { |
1272 | struct vis_packet *vis_packet; | |
e7017195 | 1273 | struct ethhdr *ethhdr; |
14741240 | 1274 | struct bat_priv *bat_priv; |
e7017195 | 1275 | int hdr_size = sizeof(struct vis_packet); |
5beef3c9 | 1276 | |
e7017195 SW |
1277 | if (skb_headlen(skb) < hdr_size) |
1278 | return NET_RX_DROP; | |
1279 | ||
1280 | vis_packet = (struct vis_packet *) skb->data; | |
1281 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 1282 | |
4efe0b06 AL |
1283 | /* not for me */ |
1284 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 1285 | return NET_RX_DROP; |
5beef3c9 | 1286 | |
4efe0b06 AL |
1287 | /* ignore own packets */ |
1288 | if (is_my_mac(vis_packet->vis_orig)) | |
e7017195 | 1289 | return NET_RX_DROP; |
5beef3c9 | 1290 | |
4efe0b06 | 1291 | if (is_my_mac(vis_packet->sender_orig)) |
e7017195 | 1292 | return NET_RX_DROP; |
5beef3c9 | 1293 | |
14741240 ML |
1294 | /* FIXME: each batman_if will be attached to a softif */ |
1295 | bat_priv = netdev_priv(soft_device); | |
1296 | ||
4efe0b06 AL |
1297 | switch (vis_packet->vis_type) { |
1298 | case VIS_TYPE_SERVER_SYNC: | |
e7017195 | 1299 | /* TODO: handle fragmented skbs properly */ |
14741240 ML |
1300 | receive_server_sync_packet(bat_priv, vis_packet, |
1301 | skb_headlen(skb)); | |
4efe0b06 | 1302 | break; |
5beef3c9 | 1303 | |
4efe0b06 | 1304 | case VIS_TYPE_CLIENT_UPDATE: |
e7017195 | 1305 | /* TODO: handle fragmented skbs properly */ |
14741240 ML |
1306 | receive_client_update_packet(bat_priv, vis_packet, |
1307 | skb_headlen(skb)); | |
4efe0b06 | 1308 | break; |
5beef3c9 | 1309 | |
4efe0b06 AL |
1310 | default: /* ignore unknown packet */ |
1311 | break; | |
1312 | } | |
8d03847c AL |
1313 | |
1314 | /* We take a copy of the data in the packet, so we should | |
1315 | always free the skbuf. */ | |
1316 | return NET_RX_DROP; | |
5beef3c9 | 1317 | } |