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5beef3c9 AL |
1 | /* |
2 | * Copyright (C) 2007-2009 B.A.T.M.A.N. contributors: | |
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" | |
28 | #include "device.h" | |
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 | |
5beef3c9 | 36 | 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 | { | |
4efe0b06 AL |
80 | /* route deleted */ |
81 | if ((orig_node->router != NULL) && (neigh_node == NULL)) { | |
5beef3c9 | 82 | |
b9b27e4e AL |
83 | bat_dbg(DBG_ROUTES, "Deleting route towards: %pM\n", |
84 | orig_node->orig); | |
4efe0b06 | 85 | hna_global_del_orig(orig_node, "originator timed out"); |
5beef3c9 | 86 | |
4efe0b06 AL |
87 | /* route added */ |
88 | } else if ((orig_node->router == NULL) && (neigh_node != NULL)) { | |
5beef3c9 | 89 | |
4efe0b06 | 90 | bat_dbg(DBG_ROUTES, |
b9b27e4e AL |
91 | "Adding route towards: %pM (via %pM)\n", |
92 | orig_node->orig, neigh_node->addr); | |
4efe0b06 AL |
93 | hna_global_add_orig(orig_node, hna_buff, hna_buff_len); |
94 | ||
95 | /* route changed */ | |
5beef3c9 | 96 | } else { |
b9b27e4e | 97 | bat_dbg(DBG_ROUTES, "Changing route towards: %pM (now via %pM - was via %pM)\n", orig_node->orig, neigh_node->addr, orig_node->router->addr); |
4efe0b06 | 98 | } |
5beef3c9 | 99 | |
4efe0b06 AL |
100 | if (neigh_node != NULL) |
101 | orig_node->batman_if = neigh_node->if_incoming; | |
102 | else | |
103 | orig_node->batman_if = NULL; | |
5beef3c9 | 104 | |
4efe0b06 AL |
105 | orig_node->router = neigh_node; |
106 | } | |
5beef3c9 | 107 | |
5beef3c9 | 108 | |
8a2e042c | 109 | void update_routes(struct orig_node *orig_node, |
4efe0b06 AL |
110 | struct neigh_node *neigh_node, |
111 | unsigned char *hna_buff, int hna_buff_len) | |
112 | { | |
5beef3c9 | 113 | |
4efe0b06 AL |
114 | if (orig_node == NULL) |
115 | return; | |
116 | ||
117 | if (orig_node->router != neigh_node) | |
118 | update_route(orig_node, neigh_node, hna_buff, hna_buff_len); | |
119 | /* may be just HNA changed */ | |
120 | else | |
121 | update_HNA(orig_node, hna_buff, hna_buff_len); | |
5beef3c9 AL |
122 | } |
123 | ||
4efe0b06 AL |
124 | static int isBidirectionalNeigh(struct orig_node *orig_node, |
125 | struct orig_node *orig_neigh_node, | |
126 | struct batman_packet *batman_packet, | |
127 | struct batman_if *if_incoming) | |
5beef3c9 AL |
128 | { |
129 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
5beef3c9 AL |
130 | unsigned char total_count; |
131 | ||
5beef3c9 | 132 | if (orig_node == orig_neigh_node) { |
4efe0b06 AL |
133 | list_for_each_entry(tmp_neigh_node, |
134 | &orig_node->neigh_list, | |
135 | list) { | |
5beef3c9 | 136 | |
4efe0b06 AL |
137 | if (compare_orig(tmp_neigh_node->addr, |
138 | orig_neigh_node->orig) && | |
139 | (tmp_neigh_node->if_incoming == if_incoming)) | |
5beef3c9 AL |
140 | neigh_node = tmp_neigh_node; |
141 | } | |
142 | ||
c4bf05d3 | 143 | if (!neigh_node) |
4efe0b06 AL |
144 | neigh_node = create_neighbor(orig_node, |
145 | orig_neigh_node, | |
146 | orig_neigh_node->orig, | |
147 | if_incoming); | |
c4bf05d3 SW |
148 | /* create_neighbor failed, return 0 */ |
149 | if (!neigh_node) | |
150 | return 0; | |
5beef3c9 AL |
151 | |
152 | neigh_node->last_valid = jiffies; | |
153 | } else { | |
154 | /* find packet count of corresponding one hop neighbor */ | |
4efe0b06 AL |
155 | list_for_each_entry(tmp_neigh_node, |
156 | &orig_neigh_node->neigh_list, list) { | |
5beef3c9 | 157 | |
4efe0b06 AL |
158 | if (compare_orig(tmp_neigh_node->addr, |
159 | orig_neigh_node->orig) && | |
160 | (tmp_neigh_node->if_incoming == if_incoming)) | |
5beef3c9 AL |
161 | neigh_node = tmp_neigh_node; |
162 | } | |
163 | ||
c4bf05d3 | 164 | if (!neigh_node) |
4efe0b06 AL |
165 | neigh_node = create_neighbor(orig_neigh_node, |
166 | orig_neigh_node, | |
167 | orig_neigh_node->orig, | |
168 | if_incoming); | |
c4bf05d3 SW |
169 | /* create_neighbor failed, return 0 */ |
170 | if (!neigh_node) | |
171 | return 0; | |
5beef3c9 AL |
172 | } |
173 | ||
174 | orig_node->last_valid = jiffies; | |
175 | ||
176 | /* pay attention to not get a value bigger than 100 % */ | |
4efe0b06 AL |
177 | total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > |
178 | neigh_node->real_packet_count ? | |
179 | neigh_node->real_packet_count : | |
180 | orig_neigh_node->bcast_own_sum[if_incoming->if_num]); | |
5beef3c9 AL |
181 | |
182 | /* if we have too few packets (too less data) we set tq_own to zero */ | |
183 | /* if we receive too few packets it is not considered bidirectional */ | |
4efe0b06 AL |
184 | if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || |
185 | (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) | |
5beef3c9 AL |
186 | orig_neigh_node->tq_own = 0; |
187 | else | |
4efe0b06 AL |
188 | /* neigh_node->real_packet_count is never zero as we |
189 | * only purge old information when getting new | |
190 | * information */ | |
191 | orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / | |
192 | neigh_node->real_packet_count; | |
5beef3c9 AL |
193 | |
194 | /* | |
4efe0b06 AL |
195 | * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
196 | * affect the nearly-symmetric links only a little, but | |
197 | * punishes asymmetric links more. This will give a value | |
198 | * between 0 and TQ_MAX_VALUE | |
5beef3c9 | 199 | */ |
4efe0b06 AL |
200 | orig_neigh_node->tq_asym_penalty = |
201 | TQ_MAX_VALUE - | |
202 | (TQ_MAX_VALUE * | |
203 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * | |
204 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * | |
205 | (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / | |
206 | (TQ_LOCAL_WINDOW_SIZE * | |
207 | TQ_LOCAL_WINDOW_SIZE * | |
208 | TQ_LOCAL_WINDOW_SIZE); | |
209 | ||
210 | batman_packet->tq = ((batman_packet->tq * | |
211 | orig_neigh_node->tq_own * | |
212 | orig_neigh_node->tq_asym_penalty) / | |
213 | (TQ_MAX_VALUE * TQ_MAX_VALUE)); | |
5beef3c9 | 214 | |
b9b27e4e AL |
215 | bat_dbg(DBG_BATMAN, "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i \n", |
216 | orig_node->orig, orig_neigh_node->orig, total_count, | |
4efe0b06 AL |
217 | neigh_node->real_packet_count, orig_neigh_node->tq_own, |
218 | orig_neigh_node->tq_asym_penalty, batman_packet->tq); | |
5beef3c9 | 219 | |
4efe0b06 AL |
220 | /* if link has the minimum required transmission quality |
221 | * consider it bidirectional */ | |
5beef3c9 AL |
222 | if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) |
223 | return 1; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
4efe0b06 AL |
228 | static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, |
229 | struct batman_packet *batman_packet, | |
230 | struct batman_if *if_incoming, | |
231 | unsigned char *hna_buff, int hna_buff_len, | |
232 | char is_duplicate) | |
5beef3c9 AL |
233 | { |
234 | struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; | |
235 | int tmp_hna_buff_len; | |
236 | ||
bad2239e | 237 | bat_dbg(DBG_BATMAN, "update_originator(): Searching and updating originator entry of received packet \n"); |
5beef3c9 AL |
238 | |
239 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { | |
4efe0b06 AL |
240 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && |
241 | (tmp_neigh_node->if_incoming == if_incoming)) { | |
5beef3c9 AL |
242 | neigh_node = tmp_neigh_node; |
243 | continue; | |
244 | } | |
245 | ||
246 | if (is_duplicate) | |
247 | continue; | |
248 | ||
4efe0b06 AL |
249 | ring_buffer_set(tmp_neigh_node->tq_recv, |
250 | &tmp_neigh_node->tq_index, 0); | |
251 | tmp_neigh_node->tq_avg = | |
252 | ring_buffer_avg(tmp_neigh_node->tq_recv); | |
5beef3c9 AL |
253 | } |
254 | ||
c4bf05d3 SW |
255 | if (!neigh_node) { |
256 | struct orig_node *orig_tmp; | |
257 | ||
258 | orig_tmp = get_orig_node(ethhdr->h_source); | |
259 | if (!orig_tmp) | |
260 | return; | |
261 | ||
4efe0b06 | 262 | neigh_node = create_neighbor(orig_node, |
c4bf05d3 | 263 | orig_tmp, |
4efe0b06 | 264 | ethhdr->h_source, if_incoming); |
c4bf05d3 SW |
265 | if (!neigh_node) |
266 | return; | |
267 | } else | |
4efe0b06 | 268 | bat_dbg(DBG_BATMAN, |
5ea84fa3 | 269 | "Updating existing last-hop neighbor of originator\n"); |
5beef3c9 AL |
270 | |
271 | orig_node->flags = batman_packet->flags; | |
272 | neigh_node->last_valid = jiffies; | |
273 | ||
4efe0b06 AL |
274 | ring_buffer_set(neigh_node->tq_recv, |
275 | &neigh_node->tq_index, | |
276 | batman_packet->tq); | |
5beef3c9 AL |
277 | neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); |
278 | ||
279 | if (!is_duplicate) { | |
280 | orig_node->last_ttl = batman_packet->ttl; | |
281 | neigh_node->last_ttl = batman_packet->ttl; | |
282 | } | |
283 | ||
4efe0b06 AL |
284 | tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? |
285 | batman_packet->num_hna * ETH_ALEN : hna_buff_len); | |
5beef3c9 | 286 | |
4efe0b06 AL |
287 | /* if this neighbor already is our next hop there is nothing |
288 | * to change */ | |
5beef3c9 AL |
289 | if (orig_node->router == neigh_node) |
290 | goto update_hna; | |
291 | ||
292 | /* if this neighbor does not offer a better TQ we won't consider it */ | |
293 | if ((orig_node->router) && | |
294 | (orig_node->router->tq_avg > neigh_node->tq_avg)) | |
295 | goto update_hna; | |
296 | ||
4efe0b06 AL |
297 | /* if the TQ is the same and the link not more symetric we |
298 | * won't consider it either */ | |
5beef3c9 AL |
299 | if ((orig_node->router) && |
300 | ((neigh_node->tq_avg == orig_node->router->tq_avg) && | |
4efe0b06 AL |
301 | (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] |
302 | >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) | |
5beef3c9 AL |
303 | goto update_hna; |
304 | ||
305 | update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); | |
306 | return; | |
307 | ||
308 | update_hna: | |
309 | update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); | |
5beef3c9 AL |
310 | } |
311 | ||
4efe0b06 AL |
312 | static char count_real_packets(struct ethhdr *ethhdr, |
313 | struct batman_packet *batman_packet, | |
314 | struct batman_if *if_incoming) | |
5beef3c9 AL |
315 | { |
316 | struct orig_node *orig_node; | |
317 | struct neigh_node *tmp_neigh_node; | |
318 | char is_duplicate = 0; | |
4efe0b06 | 319 | uint16_t seq_diff; |
5beef3c9 AL |
320 | |
321 | orig_node = get_orig_node(batman_packet->orig); | |
322 | if (orig_node == NULL) | |
323 | return 0; | |
324 | ||
5beef3c9 AL |
325 | list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { |
326 | ||
327 | if (!is_duplicate) | |
4efe0b06 AL |
328 | is_duplicate = |
329 | get_bit_status(tmp_neigh_node->real_bits, | |
330 | orig_node->last_real_seqno, | |
331 | batman_packet->seqno); | |
332 | seq_diff = batman_packet->seqno - orig_node->last_real_seqno; | |
333 | if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && | |
334 | (tmp_neigh_node->if_incoming == if_incoming)) | |
335 | bit_get_packet(tmp_neigh_node->real_bits, seq_diff, 1); | |
5beef3c9 | 336 | else |
4efe0b06 | 337 | bit_get_packet(tmp_neigh_node->real_bits, seq_diff, 0); |
5beef3c9 | 338 | |
4efe0b06 AL |
339 | tmp_neigh_node->real_packet_count = |
340 | bit_packet_count(tmp_neigh_node->real_bits); | |
5beef3c9 AL |
341 | } |
342 | ||
343 | if (!is_duplicate) { | |
bad2239e AL |
344 | bat_dbg(DBG_BATMAN, "updating last_seqno: old %d, new %d \n", |
345 | orig_node->last_real_seqno, batman_packet->seqno); | |
5beef3c9 AL |
346 | orig_node->last_real_seqno = batman_packet->seqno; |
347 | } | |
348 | ||
349 | return is_duplicate; | |
350 | } | |
351 | ||
4efe0b06 | 352 | void receive_bat_packet(struct ethhdr *ethhdr, |
e7017195 SW |
353 | struct batman_packet *batman_packet, |
354 | unsigned char *hna_buff, int hna_buff_len, | |
355 | struct batman_if *if_incoming) | |
5beef3c9 AL |
356 | { |
357 | struct batman_if *batman_if; | |
358 | struct orig_node *orig_neigh_node, *orig_node; | |
5beef3c9 | 359 | char has_directlink_flag; |
4efe0b06 AL |
360 | char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; |
361 | char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; | |
362 | char is_duplicate; | |
5beef3c9 AL |
363 | unsigned short if_incoming_seqno; |
364 | ||
4efe0b06 AL |
365 | /* Silently drop when the batman packet is actually not a |
366 | * correct packet. | |
5beef3c9 AL |
367 | * |
368 | * This might happen if a packet is padded (e.g. Ethernet has a | |
369 | * minimum frame length of 64 byte) and the aggregation interprets | |
370 | * it as an additional length. | |
371 | * | |
4efe0b06 AL |
372 | * TODO: A more sane solution would be to have a bit in the |
373 | * batman_packet to detect whether the packet is the last | |
374 | * packet in an aggregation. Here we expect that the padding | |
375 | * is always zero (or not 0x01) | |
5beef3c9 AL |
376 | */ |
377 | if (batman_packet->packet_type != BAT_PACKET) | |
378 | return; | |
379 | ||
380 | /* could be changed by schedule_own_packet() */ | |
381 | if_incoming_seqno = atomic_read(&if_incoming->seqno); | |
382 | ||
5beef3c9 AL |
383 | has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); |
384 | ||
4efe0b06 AL |
385 | is_single_hop_neigh = (compare_orig(ethhdr->h_source, |
386 | batman_packet->orig) ? 1 : 0); | |
5beef3c9 | 387 | |
b9b27e4e AL |
388 | bat_dbg(DBG_BATMAN, "Received BATMAN packet via NB: %pM, IF: %s [%s] (from OG: %pM, via prev OG: %pM, seqno %d, tq %d, TTL %d, V %d, IDF %d) \n", |
389 | ethhdr->h_source, if_incoming->dev, if_incoming->addr_str, | |
390 | batman_packet->orig, batman_packet->prev_sender, | |
391 | batman_packet->seqno, batman_packet->tq, batman_packet->ttl, | |
392 | batman_packet->version, has_directlink_flag); | |
5beef3c9 AL |
393 | |
394 | list_for_each_entry_rcu(batman_if, &if_list, list) { | |
395 | if (batman_if->if_active != IF_ACTIVE) | |
396 | continue; | |
397 | ||
4efe0b06 AL |
398 | if (compare_orig(ethhdr->h_source, |
399 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
400 | is_my_addr = 1; |
401 | ||
4efe0b06 AL |
402 | if (compare_orig(batman_packet->orig, |
403 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
404 | is_my_orig = 1; |
405 | ||
4efe0b06 AL |
406 | if (compare_orig(batman_packet->prev_sender, |
407 | batman_if->net_dev->dev_addr)) | |
5beef3c9 AL |
408 | is_my_oldorig = 1; |
409 | ||
410 | if (compare_orig(ethhdr->h_source, broadcastAddr)) | |
411 | is_broadcast = 1; | |
412 | } | |
413 | ||
414 | if (batman_packet->version != COMPAT_VERSION) { | |
4efe0b06 AL |
415 | bat_dbg(DBG_BATMAN, |
416 | "Drop packet: incompatible batman version (%i)\n", | |
417 | batman_packet->version); | |
5beef3c9 AL |
418 | return; |
419 | } | |
420 | ||
421 | if (is_my_addr) { | |
4efe0b06 | 422 | bat_dbg(DBG_BATMAN, |
b9b27e4e AL |
423 | "Drop packet: received my own broadcast (sender: %pM)\n", |
424 | ethhdr->h_source); | |
5beef3c9 AL |
425 | return; |
426 | } | |
427 | ||
428 | if (is_broadcast) { | |
b9b27e4e | 429 | bat_dbg(DBG_BATMAN, "Drop packet: ignoring all packets with broadcast source addr (sender: %pM) \n", ethhdr->h_source); |
5beef3c9 AL |
430 | return; |
431 | } | |
432 | ||
433 | if (is_my_orig) { | |
4efe0b06 AL |
434 | TYPE_OF_WORD *word; |
435 | int offset; | |
436 | ||
5beef3c9 AL |
437 | orig_neigh_node = get_orig_node(ethhdr->h_source); |
438 | ||
c4bf05d3 SW |
439 | if (!orig_neigh_node) |
440 | return; | |
441 | ||
5ea84fa3 | 442 | /* neighbor has to indicate direct link and it has to |
4efe0b06 AL |
443 | * come via the corresponding interface */ |
444 | /* if received seqno equals last send seqno save new | |
445 | * seqno for bidirectional check */ | |
446 | if (has_directlink_flag && | |
447 | compare_orig(if_incoming->net_dev->dev_addr, | |
448 | batman_packet->orig) && | |
449 | (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { | |
450 | offset = if_incoming->if_num * NUM_WORDS; | |
451 | word = &(orig_neigh_node->bcast_own[offset]); | |
452 | bit_mark(word, 0); | |
453 | orig_neigh_node->bcast_own_sum[if_incoming->if_num] = | |
454 | bit_packet_count(word); | |
5beef3c9 AL |
455 | } |
456 | ||
5ea84fa3 | 457 | bat_dbg(DBG_BATMAN, "Drop packet: originator packet from myself (via neighbor) \n"); |
5beef3c9 AL |
458 | return; |
459 | } | |
460 | ||
461 | if (batman_packet->tq == 0) { | |
462 | count_real_packets(ethhdr, batman_packet, if_incoming); | |
463 | ||
bad2239e | 464 | bat_dbg(DBG_BATMAN, "Drop packet: originator packet with tq equal 0 \n"); |
5beef3c9 AL |
465 | return; |
466 | } | |
467 | ||
468 | if (is_my_oldorig) { | |
b9b27e4e | 469 | bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast echos (sender: %pM) \n", ethhdr->h_source); |
5beef3c9 AL |
470 | return; |
471 | } | |
472 | ||
473 | is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); | |
474 | ||
475 | orig_node = get_orig_node(batman_packet->orig); | |
476 | if (orig_node == NULL) | |
477 | return; | |
478 | ||
479 | /* avoid temporary routing loops */ | |
4efe0b06 AL |
480 | if ((orig_node->router) && |
481 | (orig_node->router->orig_node->router) && | |
482 | (compare_orig(orig_node->router->addr, | |
483 | batman_packet->prev_sender)) && | |
5beef3c9 | 484 | !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && |
4efe0b06 AL |
485 | (compare_orig(orig_node->router->addr, |
486 | orig_node->router->orig_node->router->addr))) { | |
b9b27e4e | 487 | bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM) \n", ethhdr->h_source); |
5beef3c9 AL |
488 | return; |
489 | } | |
490 | ||
4efe0b06 AL |
491 | /* if sender is a direct neighbor the sender mac equals |
492 | * originator mac */ | |
493 | orig_neigh_node = (is_single_hop_neigh ? | |
494 | orig_node : get_orig_node(ethhdr->h_source)); | |
5beef3c9 AL |
495 | if (orig_neigh_node == NULL) |
496 | return; | |
497 | ||
4efe0b06 AL |
498 | /* drop packet if sender is not a direct neighbor and if we |
499 | * don't route towards it */ | |
500 | if (!is_single_hop_neigh && | |
501 | (orig_neigh_node->router == NULL)) { | |
bad2239e | 502 | bat_dbg(DBG_BATMAN, "Drop packet: OGM via unknown neighbor!\n"); |
5beef3c9 AL |
503 | return; |
504 | } | |
505 | ||
4efe0b06 AL |
506 | is_bidirectional = isBidirectionalNeigh(orig_node, orig_neigh_node, |
507 | batman_packet, if_incoming); | |
5beef3c9 | 508 | |
4efe0b06 AL |
509 | /* update ranking if it is not a duplicate or has the same |
510 | * seqno and similar ttl as the non-duplicate */ | |
511 | if (is_bidirectional && | |
512 | (!is_duplicate || | |
513 | ((orig_node->last_real_seqno == batman_packet->seqno) && | |
514 | (orig_node->last_ttl - 3 <= batman_packet->ttl)))) | |
515 | update_orig(orig_node, ethhdr, batman_packet, | |
516 | if_incoming, hna_buff, hna_buff_len, is_duplicate); | |
5beef3c9 | 517 | |
5ea84fa3 | 518 | /* is single hop (direct) neighbor */ |
5beef3c9 AL |
519 | if (is_single_hop_neigh) { |
520 | ||
521 | /* mark direct link on incoming interface */ | |
4efe0b06 AL |
522 | schedule_forward_packet(orig_node, ethhdr, batman_packet, |
523 | 1, hna_buff_len, if_incoming); | |
5beef3c9 | 524 | |
5ea84fa3 | 525 | bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
5beef3c9 AL |
526 | return; |
527 | } | |
528 | ||
529 | /* multihop originator */ | |
530 | if (!is_bidirectional) { | |
4efe0b06 AL |
531 | bat_dbg(DBG_BATMAN, |
532 | "Drop packet: not received via bidirectional link\n"); | |
5beef3c9 AL |
533 | return; |
534 | } | |
535 | ||
536 | if (is_duplicate) { | |
bad2239e | 537 | bat_dbg(DBG_BATMAN, "Drop packet: duplicate packet received\n"); |
5beef3c9 AL |
538 | return; |
539 | } | |
540 | ||
4efe0b06 AL |
541 | bat_dbg(DBG_BATMAN, |
542 | "Forwarding packet: rebroadcast originator packet\n"); | |
543 | schedule_forward_packet(orig_node, ethhdr, batman_packet, | |
544 | 0, hna_buff_len, if_incoming); | |
5beef3c9 AL |
545 | } |
546 | ||
e7017195 SW |
547 | int recv_bat_packet(struct sk_buff *skb, |
548 | struct batman_if *batman_if) | |
5beef3c9 | 549 | { |
e7017195 SW |
550 | struct ethhdr *ethhdr; |
551 | unsigned long flags; | |
f347b873 | 552 | struct sk_buff *skb_old; |
5beef3c9 | 553 | |
e7017195 SW |
554 | /* drop packet if it has not necessary minimum size */ |
555 | if (skb_headlen(skb) < sizeof(struct batman_packet)) | |
556 | return NET_RX_DROP; | |
5beef3c9 | 557 | |
e7017195 | 558 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
5beef3c9 | 559 | |
4efe0b06 AL |
560 | /* packet with broadcast indication but unicast recipient */ |
561 | if (!is_bcast(ethhdr->h_dest)) | |
e7017195 | 562 | return NET_RX_DROP; |
4efe0b06 AL |
563 | |
564 | /* packet with broadcast sender address */ | |
565 | if (is_bcast(ethhdr->h_source)) | |
e7017195 SW |
566 | return NET_RX_DROP; |
567 | ||
e7017195 SW |
568 | /* TODO: we use headlen instead of "length", because |
569 | * only this data is paged in. */ | |
f347b873 SE |
570 | |
571 | /* create a copy of the skb, if needed, to modify it. */ | |
572 | if (!skb_clone_writable(skb, skb_headlen(skb))) { | |
573 | skb_old = skb; | |
574 | skb = skb_copy(skb, GFP_ATOMIC); | |
575 | if (!skb) | |
576 | return NET_RX_DROP; | |
577 | kfree_skb(skb_old); | |
578 | } | |
579 | ||
580 | spin_lock_irqsave(&orig_hash_lock, flags); | |
4efe0b06 | 581 | receive_aggr_bat_packet(ethhdr, |
e7017195 SW |
582 | skb->data, |
583 | skb_headlen(skb), | |
4efe0b06 | 584 | batman_if); |
e7017195 SW |
585 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
586 | ||
587 | kfree_skb(skb); | |
588 | return NET_RX_SUCCESS; | |
4efe0b06 AL |
589 | } |
590 | ||
e7017195 | 591 | static int recv_my_icmp_packet(struct sk_buff *skb) |
5beef3c9 | 592 | { |
5beef3c9 | 593 | struct orig_node *orig_node; |
e7017195 SW |
594 | struct icmp_packet *icmp_packet; |
595 | struct ethhdr *ethhdr; | |
596 | struct sk_buff *skb_old; | |
597 | struct batman_if *batman_if; | |
598 | int ret; | |
599 | unsigned long flags; | |
600 | uint8_t dstaddr[ETH_ALEN]; | |
601 | ||
602 | icmp_packet = (struct icmp_packet *) skb->data; | |
603 | ethhdr = (struct ethhdr *) skb_mac_header(skb); | |
5beef3c9 | 604 | |
4efe0b06 AL |
605 | /* add data to device queue */ |
606 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
607 | bat_device_receive_packet(icmp_packet); | |
e7017195 | 608 | return NET_RX_DROP; |
5beef3c9 AL |
609 | } |
610 | ||
4efe0b06 AL |
611 | /* answer echo request (ping) */ |
612 | /* get routing information */ | |
e7017195 | 613 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
614 | orig_node = ((struct orig_node *)hash_find(orig_hash, |
615 | icmp_packet->orig)); | |
e7017195 | 616 | ret = NET_RX_DROP; |
4efe0b06 AL |
617 | |
618 | if ((orig_node != NULL) && | |
619 | (orig_node->batman_if != NULL) && | |
620 | (orig_node->router != NULL)) { | |
e7017195 SW |
621 | |
622 | /* don't lock while sending the packets ... we therefore | |
623 | * copy the required data before sending */ | |
624 | batman_if = orig_node->batman_if; | |
625 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
626 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
627 | ||
628 | /* create a copy of the skb, if needed, to modify it. */ | |
629 | skb_old = NULL; | |
630 | if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { | |
631 | skb_old = skb; | |
632 | skb = skb_copy(skb, GFP_ATOMIC); | |
633 | if (!skb) | |
634 | return NET_RX_DROP; | |
635 | icmp_packet = (struct icmp_packet *) skb->data; | |
636 | kfree_skb(skb_old); | |
637 | } | |
638 | ||
4efe0b06 AL |
639 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
640 | memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); | |
641 | icmp_packet->msg_type = ECHO_REPLY; | |
642 | icmp_packet->ttl = TTL; | |
643 | ||
e7017195 SW |
644 | send_skb_packet(skb, batman_if, dstaddr); |
645 | ret = NET_RX_SUCCESS; | |
5beef3c9 | 646 | |
e7017195 SW |
647 | } else |
648 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
649 | ||
650 | return ret; | |
4efe0b06 | 651 | } |
5beef3c9 | 652 | |
e7017195 | 653 | static int recv_icmp_ttl_exceeded(struct sk_buff *skb) |
4efe0b06 | 654 | { |
4efe0b06 | 655 | struct orig_node *orig_node; |
e7017195 SW |
656 | struct icmp_packet *icmp_packet; |
657 | struct ethhdr *ethhdr; | |
658 | struct sk_buff *skb_old; | |
659 | struct batman_if *batman_if; | |
660 | int ret; | |
661 | unsigned long flags; | |
662 | uint8_t dstaddr[ETH_ALEN]; | |
663 | ||
149de2e5 ML |
664 | icmp_packet = (struct icmp_packet *)skb->data; |
665 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 666 | |
4efe0b06 | 667 | /* send TTL exceeded if packet is an echo request (traceroute) */ |
149de2e5 ML |
668 | if (icmp_packet->msg_type != ECHO_REQUEST) { |
669 | printk(KERN_WARNING "batman-adv:Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", | |
670 | icmp_packet->orig, icmp_packet->dst); | |
e7017195 | 671 | return NET_RX_DROP; |
149de2e5 | 672 | } |
5beef3c9 | 673 | |
4efe0b06 | 674 | /* get routing information */ |
e7017195 | 675 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
676 | orig_node = ((struct orig_node *) |
677 | hash_find(orig_hash, icmp_packet->orig)); | |
e7017195 | 678 | ret = NET_RX_DROP; |
4efe0b06 AL |
679 | |
680 | if ((orig_node != NULL) && | |
681 | (orig_node->batman_if != NULL) && | |
682 | (orig_node->router != NULL)) { | |
e7017195 SW |
683 | |
684 | /* don't lock while sending the packets ... we therefore | |
685 | * copy the required data before sending */ | |
686 | batman_if = orig_node->batman_if; | |
687 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
688 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
689 | ||
690 | /* create a copy of the skb, if needed, to modify it. */ | |
691 | if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { | |
692 | skb_old = skb; | |
693 | skb = skb_copy(skb, GFP_ATOMIC); | |
694 | if (!skb) | |
695 | return NET_RX_DROP; | |
696 | icmp_packet = (struct icmp_packet *) skb->data; | |
697 | kfree_skb(skb_old); | |
698 | } | |
699 | ||
4efe0b06 AL |
700 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
701 | memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); | |
702 | icmp_packet->msg_type = TTL_EXCEEDED; | |
703 | icmp_packet->ttl = TTL; | |
704 | ||
e7017195 SW |
705 | send_skb_packet(skb, batman_if, dstaddr); |
706 | ret = NET_RX_SUCCESS; | |
5beef3c9 | 707 | |
e7017195 SW |
708 | } else |
709 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
5beef3c9 | 710 | |
e7017195 | 711 | return ret; |
4efe0b06 | 712 | } |
5beef3c9 | 713 | |
5beef3c9 | 714 | |
e7017195 | 715 | int recv_icmp_packet(struct sk_buff *skb) |
4efe0b06 AL |
716 | { |
717 | struct icmp_packet *icmp_packet; | |
e7017195 | 718 | struct ethhdr *ethhdr; |
4efe0b06 | 719 | struct orig_node *orig_node; |
e7017195 SW |
720 | struct sk_buff *skb_old; |
721 | struct batman_if *batman_if; | |
722 | int hdr_size = sizeof(struct icmp_packet); | |
723 | int ret; | |
724 | unsigned long flags; | |
725 | uint8_t dstaddr[ETH_ALEN]; | |
726 | ||
727 | /* drop packet if it has not necessary minimum size */ | |
728 | if (skb_headlen(skb) < hdr_size) | |
729 | return NET_RX_DROP; | |
730 | ||
731 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 732 | |
4efe0b06 AL |
733 | /* packet with unicast indication but broadcast recipient */ |
734 | if (is_bcast(ethhdr->h_dest)) | |
e7017195 | 735 | return NET_RX_DROP; |
5beef3c9 | 736 | |
4efe0b06 AL |
737 | /* packet with broadcast sender address */ |
738 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 739 | return NET_RX_DROP; |
5beef3c9 | 740 | |
4efe0b06 AL |
741 | /* not for me */ |
742 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 743 | return NET_RX_DROP; |
5beef3c9 | 744 | |
e7017195 | 745 | icmp_packet = (struct icmp_packet *) skb->data; |
5beef3c9 | 746 | |
4efe0b06 AL |
747 | /* packet for me */ |
748 | if (is_my_mac(icmp_packet->dst)) | |
e7017195 | 749 | return recv_my_icmp_packet(skb); |
5beef3c9 | 750 | |
4efe0b06 | 751 | /* TTL exceeded */ |
e7017195 SW |
752 | if (icmp_packet->ttl < 2) |
753 | return recv_icmp_ttl_exceeded(skb); | |
5beef3c9 | 754 | |
e7017195 | 755 | ret = NET_RX_DROP; |
5beef3c9 | 756 | |
4efe0b06 | 757 | /* get routing information */ |
e7017195 | 758 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
759 | orig_node = ((struct orig_node *) |
760 | hash_find(orig_hash, icmp_packet->dst)); | |
5beef3c9 | 761 | |
4efe0b06 AL |
762 | if ((orig_node != NULL) && |
763 | (orig_node->batman_if != NULL) && | |
764 | (orig_node->router != NULL)) { | |
5beef3c9 | 765 | |
e7017195 SW |
766 | /* don't lock while sending the packets ... we therefore |
767 | * copy the required data before sending */ | |
768 | batman_if = orig_node->batman_if; | |
769 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
770 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
771 | ||
772 | /* create a copy of the skb, if needed, to modify it. */ | |
773 | if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { | |
774 | skb_old = skb; | |
775 | skb = skb_copy(skb, GFP_ATOMIC); | |
776 | if (!skb) | |
777 | return NET_RX_DROP; | |
778 | icmp_packet = (struct icmp_packet *) skb->data; | |
779 | kfree_skb(skb_old); | |
780 | } | |
781 | ||
4efe0b06 AL |
782 | /* decrement ttl */ |
783 | icmp_packet->ttl--; | |
5beef3c9 | 784 | |
4efe0b06 | 785 | /* route it */ |
e7017195 SW |
786 | send_skb_packet(skb, batman_if, dstaddr); |
787 | ret = NET_RX_SUCCESS; | |
788 | ||
789 | } else | |
790 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
791 | ||
792 | return ret; | |
4efe0b06 | 793 | } |
5beef3c9 | 794 | |
e7017195 | 795 | int recv_unicast_packet(struct sk_buff *skb) |
4efe0b06 AL |
796 | { |
797 | struct unicast_packet *unicast_packet; | |
4efe0b06 | 798 | struct orig_node *orig_node; |
e7017195 SW |
799 | struct ethhdr *ethhdr; |
800 | struct batman_if *batman_if; | |
801 | struct sk_buff *skb_old; | |
802 | uint8_t dstaddr[ETH_ALEN]; | |
803 | int hdr_size = sizeof(struct unicast_packet); | |
804 | int ret; | |
805 | unsigned long flags; | |
806 | ||
807 | /* drop packet if it has not necessary minimum size */ | |
808 | if (skb_headlen(skb) < hdr_size) | |
809 | return NET_RX_DROP; | |
810 | ||
811 | ethhdr = (struct ethhdr *) skb_mac_header(skb); | |
5beef3c9 | 812 | |
4efe0b06 AL |
813 | /* packet with unicast indication but broadcast recipient */ |
814 | if (is_bcast(ethhdr->h_dest)) | |
e7017195 | 815 | return NET_RX_DROP; |
5beef3c9 | 816 | |
4efe0b06 AL |
817 | /* packet with broadcast sender address */ |
818 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 819 | return NET_RX_DROP; |
5beef3c9 | 820 | |
4efe0b06 AL |
821 | /* not for me */ |
822 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 823 | return NET_RX_DROP; |
5beef3c9 | 824 | |
e7017195 | 825 | unicast_packet = (struct unicast_packet *) skb->data; |
5beef3c9 | 826 | |
4efe0b06 AL |
827 | /* packet for me */ |
828 | if (is_my_mac(unicast_packet->dest)) { | |
e7017195 SW |
829 | interface_rx(skb, hdr_size); |
830 | return NET_RX_SUCCESS; | |
4efe0b06 | 831 | } |
5beef3c9 | 832 | |
4efe0b06 AL |
833 | /* TTL exceeded */ |
834 | if (unicast_packet->ttl < 2) { | |
149de2e5 ML |
835 | printk(KERN_WARNING "batman-adv:Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
836 | ethhdr->h_source, unicast_packet->dest); | |
e7017195 | 837 | return NET_RX_DROP; |
4efe0b06 | 838 | } |
5beef3c9 | 839 | |
e7017195 | 840 | ret = NET_RX_DROP; |
4efe0b06 | 841 | /* get routing information */ |
e7017195 | 842 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
843 | orig_node = ((struct orig_node *) |
844 | hash_find(orig_hash, unicast_packet->dest)); | |
845 | ||
846 | if ((orig_node != NULL) && | |
847 | (orig_node->batman_if != NULL) && | |
848 | (orig_node->router != NULL)) { | |
e7017195 SW |
849 | |
850 | /* don't lock while sending the packets ... we therefore | |
851 | * copy the required data before sending */ | |
852 | batman_if = orig_node->batman_if; | |
853 | memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); | |
854 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
855 | ||
856 | /* create a copy of the skb, if needed, to modify it. */ | |
857 | if (!skb_clone_writable(skb, sizeof(struct unicast_packet))) { | |
858 | skb_old = skb; | |
859 | skb = skb_copy(skb, GFP_ATOMIC); | |
860 | if (!skb) | |
861 | return NET_RX_DROP; | |
862 | unicast_packet = (struct unicast_packet *) skb->data; | |
863 | kfree_skb(skb_old); | |
864 | } | |
4efe0b06 AL |
865 | /* decrement ttl */ |
866 | unicast_packet->ttl--; | |
867 | ||
868 | /* route it */ | |
e7017195 SW |
869 | send_skb_packet(skb, batman_if, dstaddr); |
870 | ret = NET_RX_SUCCESS; | |
871 | ||
872 | } else | |
873 | spin_unlock_irqrestore(&orig_hash_lock, flags); | |
874 | ||
875 | return ret; | |
4efe0b06 | 876 | } |
5beef3c9 | 877 | |
5beef3c9 | 878 | |
e7017195 | 879 | int recv_bcast_packet(struct sk_buff *skb) |
4efe0b06 AL |
880 | { |
881 | struct orig_node *orig_node; | |
882 | struct bcast_packet *bcast_packet; | |
e7017195 SW |
883 | struct ethhdr *ethhdr; |
884 | int hdr_size = sizeof(struct bcast_packet); | |
885 | unsigned long flags; | |
886 | ||
887 | /* drop packet if it has not necessary minimum size */ | |
888 | if (skb_headlen(skb) < hdr_size) | |
889 | return NET_RX_DROP; | |
890 | ||
891 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 892 | |
4efe0b06 AL |
893 | /* packet with broadcast indication but unicast recipient */ |
894 | if (!is_bcast(ethhdr->h_dest)) | |
e7017195 | 895 | return NET_RX_DROP; |
5beef3c9 | 896 | |
4efe0b06 AL |
897 | /* packet with broadcast sender address */ |
898 | if (is_bcast(ethhdr->h_source)) | |
e7017195 | 899 | return NET_RX_DROP; |
5beef3c9 | 900 | |
4efe0b06 AL |
901 | /* ignore broadcasts sent by myself */ |
902 | if (is_my_mac(ethhdr->h_source)) | |
e7017195 | 903 | return NET_RX_DROP; |
5beef3c9 | 904 | |
e7017195 | 905 | bcast_packet = (struct bcast_packet *) skb->data; |
5beef3c9 | 906 | |
4efe0b06 AL |
907 | /* ignore broadcasts originated by myself */ |
908 | if (is_my_mac(bcast_packet->orig)) | |
e7017195 | 909 | return NET_RX_DROP; |
5beef3c9 | 910 | |
e7017195 | 911 | spin_lock_irqsave(&orig_hash_lock, flags); |
4efe0b06 AL |
912 | orig_node = ((struct orig_node *) |
913 | hash_find(orig_hash, bcast_packet->orig)); | |
5beef3c9 | 914 | |
4efe0b06 | 915 | if (orig_node == NULL) { |
e7017195 SW |
916 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
917 | return NET_RX_DROP; | |
4efe0b06 | 918 | } |
5beef3c9 | 919 | |
4efe0b06 AL |
920 | /* check flood history */ |
921 | if (get_bit_status(orig_node->bcast_bits, | |
922 | orig_node->last_bcast_seqno, | |
923 | ntohs(bcast_packet->seqno))) { | |
e7017195 SW |
924 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
925 | return NET_RX_DROP; | |
4efe0b06 | 926 | } |
5beef3c9 | 927 | |
4efe0b06 AL |
928 | /* mark broadcast in flood history */ |
929 | if (bit_get_packet(orig_node->bcast_bits, | |
930 | ntohs(bcast_packet->seqno) - | |
931 | orig_node->last_bcast_seqno, 1)) | |
932 | orig_node->last_bcast_seqno = ntohs(bcast_packet->seqno); | |
5beef3c9 | 933 | |
e7017195 SW |
934 | spin_unlock_irqrestore(&orig_hash_lock, flags); |
935 | ||
936 | /* rebroadcast packet */ | |
937 | add_bcast_packet_to_list(skb); | |
5beef3c9 | 938 | |
4efe0b06 | 939 | /* broadcast for me */ |
e7017195 | 940 | interface_rx(skb, hdr_size); |
5beef3c9 | 941 | |
e7017195 | 942 | return NET_RX_SUCCESS; |
4efe0b06 | 943 | } |
5beef3c9 | 944 | |
e7017195 | 945 | int recv_vis_packet(struct sk_buff *skb) |
4efe0b06 AL |
946 | { |
947 | struct vis_packet *vis_packet; | |
e7017195 SW |
948 | struct ethhdr *ethhdr; |
949 | int hdr_size = sizeof(struct vis_packet); | |
5beef3c9 | 950 | |
e7017195 SW |
951 | if (skb_headlen(skb) < hdr_size) |
952 | return NET_RX_DROP; | |
953 | ||
954 | vis_packet = (struct vis_packet *) skb->data; | |
955 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
5beef3c9 | 956 | |
4efe0b06 AL |
957 | /* not for me */ |
958 | if (!is_my_mac(ethhdr->h_dest)) | |
e7017195 | 959 | return NET_RX_DROP; |
5beef3c9 | 960 | |
4efe0b06 AL |
961 | /* ignore own packets */ |
962 | if (is_my_mac(vis_packet->vis_orig)) | |
e7017195 | 963 | return NET_RX_DROP; |
5beef3c9 | 964 | |
4efe0b06 | 965 | if (is_my_mac(vis_packet->sender_orig)) |
e7017195 | 966 | return NET_RX_DROP; |
5beef3c9 | 967 | |
4efe0b06 AL |
968 | switch (vis_packet->vis_type) { |
969 | case VIS_TYPE_SERVER_SYNC: | |
e7017195 SW |
970 | /* TODO: handle fragmented skbs properly */ |
971 | receive_server_sync_packet(vis_packet, skb_headlen(skb)); | |
4efe0b06 | 972 | break; |
5beef3c9 | 973 | |
4efe0b06 | 974 | case VIS_TYPE_CLIENT_UPDATE: |
e7017195 SW |
975 | /* TODO: handle fragmented skbs properly */ |
976 | receive_client_update_packet(vis_packet, skb_headlen(skb)); | |
4efe0b06 | 977 | break; |
5beef3c9 | 978 | |
4efe0b06 AL |
979 | default: /* ignore unknown packet */ |
980 | break; | |
981 | } | |
8d03847c AL |
982 | |
983 | /* We take a copy of the data in the packet, so we should | |
984 | always free the skbuf. */ | |
985 | return NET_RX_DROP; | |
5beef3c9 | 986 | } |