Commit | Line | Data |
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c6c8fea2 | 1 | /* |
567db7b0 | 2 | * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "routing.h" | |
24 | #include "send.h" | |
c6c8fea2 SE |
25 | #include "soft-interface.h" |
26 | #include "hard-interface.h" | |
27 | #include "icmp_socket.h" | |
28 | #include "translation-table.h" | |
29 | #include "originator.h" | |
c6c8fea2 | 30 | #include "vis.h" |
c6c8fea2 SE |
31 | #include "unicast.h" |
32 | ||
e6c10f43 | 33 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 34 | { |
e6c10f43 | 35 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 36 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 37 | struct hlist_node *node; |
c6c8fea2 | 38 | struct hlist_head *head; |
c6c8fea2 SE |
39 | struct orig_node *orig_node; |
40 | unsigned long *word; | |
c90681b8 | 41 | uint32_t i; |
c6c8fea2 SE |
42 | size_t word_index; |
43 | ||
c6c8fea2 SE |
44 | for (i = 0; i < hash->size; i++) { |
45 | head = &hash->table[i]; | |
46 | ||
fb778ea1 | 47 | rcu_read_lock(); |
7aadf889 | 48 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 49 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
e6c10f43 | 50 | word_index = hard_iface->if_num * NUM_WORDS; |
c6c8fea2 SE |
51 | word = &(orig_node->bcast_own[word_index]); |
52 | ||
53 | bit_get_packet(bat_priv, word, 1, 0); | |
e6c10f43 | 54 | orig_node->bcast_own_sum[hard_iface->if_num] = |
c6c8fea2 | 55 | bit_packet_count(word); |
2ae2daf6 | 56 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 57 | } |
fb778ea1 | 58 | rcu_read_unlock(); |
c6c8fea2 | 59 | } |
c6c8fea2 SE |
60 | } |
61 | ||
fc957275 ML |
62 | static void _update_route(struct bat_priv *bat_priv, |
63 | struct orig_node *orig_node, | |
64 | struct neigh_node *neigh_node) | |
c6c8fea2 | 65 | { |
e1a5382f LL |
66 | struct neigh_node *curr_router; |
67 | ||
68 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 69 | |
c6c8fea2 | 70 | /* route deleted */ |
e1a5382f | 71 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
72 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
73 | orig_node->orig); | |
2dafb49d | 74 | tt_global_del_orig(bat_priv, orig_node, |
7c64fd98 | 75 | "Deleted route towards originator"); |
c6c8fea2 | 76 | |
e1a5382f LL |
77 | /* route added */ |
78 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
79 | |
80 | bat_dbg(DBG_ROUTES, bat_priv, | |
81 | "Adding route towards: %pM (via %pM)\n", | |
82 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 83 | /* route changed */ |
bb899b89 | 84 | } else if (neigh_node && curr_router) { |
c6c8fea2 | 85 | bat_dbg(DBG_ROUTES, bat_priv, |
86ceb360 | 86 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
c6c8fea2 | 87 | orig_node->orig, neigh_node->addr, |
e1a5382f | 88 | curr_router->addr); |
c6c8fea2 SE |
89 | } |
90 | ||
e1a5382f LL |
91 | if (curr_router) |
92 | neigh_node_free_ref(curr_router); | |
93 | ||
94 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
95 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
96 | neigh_node = NULL; | |
e1a5382f LL |
97 | |
98 | spin_lock_bh(&orig_node->neigh_list_lock); | |
99 | rcu_assign_pointer(orig_node->router, neigh_node); | |
100 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
101 | ||
102 | /* decrease refcount of previous best neighbor */ | |
103 | if (curr_router) | |
104 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
105 | } |
106 | ||
fc957275 ML |
107 | void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
108 | struct neigh_node *neigh_node) | |
c6c8fea2 | 109 | { |
e1a5382f | 110 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
111 | |
112 | if (!orig_node) | |
e1a5382f LL |
113 | goto out; |
114 | ||
115 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 116 | |
e1a5382f | 117 | if (router != neigh_node) |
fc957275 | 118 | _update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
119 | |
120 | out: | |
121 | if (router) | |
122 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
123 | } |
124 | ||
a4c135c5 SW |
125 | /* caller must hold the neigh_list_lock */ |
126 | void bonding_candidate_del(struct orig_node *orig_node, | |
127 | struct neigh_node *neigh_node) | |
128 | { | |
129 | /* this neighbor is not part of our candidate list */ | |
130 | if (list_empty(&neigh_node->bonding_list)) | |
131 | goto out; | |
132 | ||
133 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 134 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 135 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
136 | atomic_dec(&orig_node->bond_candidates); |
137 | ||
138 | out: | |
139 | return; | |
140 | } | |
141 | ||
fc957275 ML |
142 | void bonding_candidate_add(struct orig_node *orig_node, |
143 | struct neigh_node *neigh_node) | |
a4c135c5 SW |
144 | { |
145 | struct hlist_node *node; | |
e1a5382f LL |
146 | struct neigh_node *tmp_neigh_node, *router = NULL; |
147 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
148 | |
149 | spin_lock_bh(&orig_node->neigh_list_lock); | |
150 | ||
151 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
152 | if (!compare_eth(orig_node->orig, |
153 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
154 | goto candidate_del; |
155 | ||
e1a5382f LL |
156 | router = orig_node_get_router(orig_node); |
157 | if (!router) | |
a4c135c5 SW |
158 | goto candidate_del; |
159 | ||
a4c135c5 | 160 | /* ... and is good enough to be considered */ |
e1a5382f | 161 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
162 | goto candidate_del; |
163 | ||
164 | /** | |
165 | * check if we have another candidate with the same mac address or | |
166 | * interface. If we do, we won't select this candidate because of | |
167 | * possible interference. | |
168 | */ | |
169 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
170 | &orig_node->neigh_list, list) { | |
171 | ||
172 | if (tmp_neigh_node == neigh_node) | |
173 | continue; | |
174 | ||
175 | /* we only care if the other candidate is even | |
176 | * considered as candidate. */ | |
177 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
178 | continue; | |
179 | ||
180 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 181 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
182 | interference_candidate = 1; |
183 | break; | |
184 | } | |
185 | } | |
186 | ||
187 | /* don't care further if it is an interference candidate */ | |
188 | if (interference_candidate) | |
189 | goto candidate_del; | |
190 | ||
191 | /* this neighbor already is part of our candidate list */ | |
192 | if (!list_empty(&neigh_node->bonding_list)) | |
193 | goto out; | |
194 | ||
44524fcd ML |
195 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
196 | goto out; | |
197 | ||
a4c135c5 | 198 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
199 | atomic_inc(&orig_node->bond_candidates); |
200 | goto out; | |
201 | ||
202 | candidate_del: | |
203 | bonding_candidate_del(orig_node, neigh_node); | |
204 | ||
205 | out: | |
206 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
207 | |
208 | if (router) | |
209 | neigh_node_free_ref(router); | |
a4c135c5 SW |
210 | } |
211 | ||
212 | /* copy primary address for bonding */ | |
fc957275 ML |
213 | void bonding_save_primary(const struct orig_node *orig_node, |
214 | struct orig_node *orig_neigh_node, | |
215 | const struct batman_ogm_packet *batman_ogm_packet) | |
a4c135c5 | 216 | { |
b6da4bf5 | 217 | if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
218 | return; |
219 | ||
220 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
221 | } | |
222 | ||
c6c8fea2 SE |
223 | /* checks whether the host restarted and is in the protection time. |
224 | * returns: | |
225 | * 0 if the packet is to be accepted | |
226 | * 1 if the packet is to be ignored. | |
227 | */ | |
fc957275 ML |
228 | int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
229 | unsigned long *last_reset) | |
c6c8fea2 | 230 | { |
7c64fd98 SE |
231 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) || |
232 | (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
032b7969 | 233 | if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) { |
c6c8fea2 SE |
234 | |
235 | *last_reset = jiffies; | |
236 | bat_dbg(DBG_BATMAN, bat_priv, | |
237 | "old packet received, start protection\n"); | |
238 | ||
239 | return 0; | |
96741ade | 240 | } else { |
c6c8fea2 | 241 | return 1; |
96741ade | 242 | } |
c6c8fea2 SE |
243 | } |
244 | return 0; | |
245 | } | |
246 | ||
fc957275 | 247 | int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 248 | { |
01c4224b | 249 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 SE |
250 | struct ethhdr *ethhdr; |
251 | ||
252 | /* drop packet if it has not necessary minimum size */ | |
b6da4bf5 | 253 | if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN))) |
c6c8fea2 SE |
254 | return NET_RX_DROP; |
255 | ||
256 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
257 | ||
258 | /* packet with broadcast indication but unicast recipient */ | |
259 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
260 | return NET_RX_DROP; | |
261 | ||
262 | /* packet with broadcast sender address */ | |
263 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
264 | return NET_RX_DROP; | |
265 | ||
266 | /* create a copy of the skb, if needed, to modify it. */ | |
267 | if (skb_cow(skb, 0) < 0) | |
268 | return NET_RX_DROP; | |
269 | ||
270 | /* keep skb linear */ | |
271 | if (skb_linearize(skb) < 0) | |
272 | return NET_RX_DROP; | |
273 | ||
01c4224b | 274 | bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb); |
c6c8fea2 SE |
275 | |
276 | kfree_skb(skb); | |
277 | return NET_RX_SUCCESS; | |
278 | } | |
279 | ||
280 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
281 | struct sk_buff *skb, size_t icmp_len) | |
282 | { | |
32ae9b22 | 283 | struct hard_iface *primary_if = NULL; |
44524fcd | 284 | struct orig_node *orig_node = NULL; |
e1a5382f | 285 | struct neigh_node *router = NULL; |
c6c8fea2 | 286 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 287 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
288 | |
289 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
290 | |
291 | /* add data to device queue */ | |
292 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
293 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 294 | goto out; |
c6c8fea2 SE |
295 | } |
296 | ||
32ae9b22 ML |
297 | primary_if = primary_if_get_selected(bat_priv); |
298 | if (!primary_if) | |
44524fcd | 299 | goto out; |
c6c8fea2 SE |
300 | |
301 | /* answer echo request (ping) */ | |
302 | /* get routing information */ | |
7aadf889 | 303 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 304 | if (!orig_node) |
e1a5382f | 305 | goto out; |
c6c8fea2 | 306 | |
e1a5382f LL |
307 | router = orig_node_get_router(orig_node); |
308 | if (!router) | |
309 | goto out; | |
c6c8fea2 | 310 | |
44524fcd ML |
311 | /* create a copy of the skb, if needed, to modify it. */ |
312 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
313 | goto out; | |
314 | ||
315 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
316 | ||
317 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 318 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 319 | icmp_packet->msg_type = ECHO_REPLY; |
76543d14 | 320 | icmp_packet->header.ttl = TTL; |
44524fcd | 321 | |
e1a5382f | 322 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 323 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 324 | |
44524fcd | 325 | out: |
32ae9b22 ML |
326 | if (primary_if) |
327 | hardif_free_ref(primary_if); | |
e1a5382f LL |
328 | if (router) |
329 | neigh_node_free_ref(router); | |
44524fcd | 330 | if (orig_node) |
7b36e8ee | 331 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
332 | return ret; |
333 | } | |
334 | ||
335 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 336 | struct sk_buff *skb) |
c6c8fea2 | 337 | { |
32ae9b22 | 338 | struct hard_iface *primary_if = NULL; |
44524fcd | 339 | struct orig_node *orig_node = NULL; |
e1a5382f | 340 | struct neigh_node *router = NULL; |
c6c8fea2 | 341 | struct icmp_packet *icmp_packet; |
44524fcd | 342 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
343 | |
344 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
345 | |
346 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
347 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
86ceb360 SE |
348 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
349 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 350 | goto out; |
c6c8fea2 SE |
351 | } |
352 | ||
32ae9b22 ML |
353 | primary_if = primary_if_get_selected(bat_priv); |
354 | if (!primary_if) | |
44524fcd | 355 | goto out; |
c6c8fea2 SE |
356 | |
357 | /* get routing information */ | |
7aadf889 | 358 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 359 | if (!orig_node) |
e1a5382f | 360 | goto out; |
c6c8fea2 | 361 | |
e1a5382f LL |
362 | router = orig_node_get_router(orig_node); |
363 | if (!router) | |
364 | goto out; | |
c6c8fea2 | 365 | |
44524fcd ML |
366 | /* create a copy of the skb, if needed, to modify it. */ |
367 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
368 | goto out; | |
c6c8fea2 | 369 | |
44524fcd | 370 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 371 | |
44524fcd | 372 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 373 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 374 | icmp_packet->msg_type = TTL_EXCEEDED; |
76543d14 | 375 | icmp_packet->header.ttl = TTL; |
44524fcd | 376 | |
e1a5382f | 377 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 378 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 379 | |
44524fcd | 380 | out: |
32ae9b22 ML |
381 | if (primary_if) |
382 | hardif_free_ref(primary_if); | |
e1a5382f LL |
383 | if (router) |
384 | neigh_node_free_ref(router); | |
44524fcd | 385 | if (orig_node) |
7b36e8ee | 386 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
387 | return ret; |
388 | } | |
389 | ||
390 | ||
e6c10f43 | 391 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
392 | { |
393 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
394 | struct icmp_packet_rr *icmp_packet; | |
395 | struct ethhdr *ethhdr; | |
44524fcd | 396 | struct orig_node *orig_node = NULL; |
e1a5382f | 397 | struct neigh_node *router = NULL; |
c6c8fea2 | 398 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 399 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
400 | |
401 | /** | |
402 | * we truncate all incoming icmp packets if they don't match our size | |
403 | */ | |
404 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
405 | hdr_size = sizeof(struct icmp_packet_rr); | |
406 | ||
407 | /* drop packet if it has not necessary minimum size */ | |
408 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 409 | goto out; |
c6c8fea2 SE |
410 | |
411 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
412 | ||
413 | /* packet with unicast indication but broadcast recipient */ | |
414 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 415 | goto out; |
c6c8fea2 SE |
416 | |
417 | /* packet with broadcast sender address */ | |
418 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 419 | goto out; |
c6c8fea2 SE |
420 | |
421 | /* not for me */ | |
422 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 423 | goto out; |
c6c8fea2 SE |
424 | |
425 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
426 | ||
427 | /* add record route information if not full */ | |
428 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
429 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
430 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
7c64fd98 | 431 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
432 | icmp_packet->rr_cur++; |
433 | } | |
434 | ||
435 | /* packet for me */ | |
436 | if (is_my_mac(icmp_packet->dst)) | |
437 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
438 | ||
439 | /* TTL exceeded */ | |
76543d14 | 440 | if (icmp_packet->header.ttl < 2) |
74ef1153 | 441 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 442 | |
c6c8fea2 | 443 | /* get routing information */ |
7aadf889 | 444 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 445 | if (!orig_node) |
e1a5382f | 446 | goto out; |
c6c8fea2 | 447 | |
e1a5382f LL |
448 | router = orig_node_get_router(orig_node); |
449 | if (!router) | |
450 | goto out; | |
c6c8fea2 | 451 | |
44524fcd ML |
452 | /* create a copy of the skb, if needed, to modify it. */ |
453 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
454 | goto out; | |
c6c8fea2 | 455 | |
44524fcd | 456 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 457 | |
44524fcd | 458 | /* decrement ttl */ |
76543d14 | 459 | icmp_packet->header.ttl--; |
44524fcd ML |
460 | |
461 | /* route it */ | |
e1a5382f | 462 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 463 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 464 | |
44524fcd | 465 | out: |
e1a5382f LL |
466 | if (router) |
467 | neigh_node_free_ref(router); | |
44524fcd | 468 | if (orig_node) |
7b36e8ee | 469 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
470 | return ret; |
471 | } | |
472 | ||
55158629 LL |
473 | /* In the bonding case, send the packets in a round |
474 | * robin fashion over the remaining interfaces. | |
475 | * | |
476 | * This method rotates the bonding list and increases the | |
477 | * returned router's refcount. */ | |
478 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
747e4221 | 479 | const struct hard_iface *recv_if) |
55158629 LL |
480 | { |
481 | struct neigh_node *tmp_neigh_node; | |
482 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
483 | ||
484 | rcu_read_lock(); | |
485 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
486 | bonding_list) { | |
487 | if (!first_candidate) | |
488 | first_candidate = tmp_neigh_node; | |
489 | ||
490 | /* recv_if == NULL on the first node. */ | |
491 | if (tmp_neigh_node->if_incoming == recv_if) | |
492 | continue; | |
493 | ||
494 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
495 | continue; | |
496 | ||
497 | router = tmp_neigh_node; | |
498 | break; | |
499 | } | |
500 | ||
501 | /* use the first candidate if nothing was found. */ | |
502 | if (!router && first_candidate && | |
503 | atomic_inc_not_zero(&first_candidate->refcount)) | |
504 | router = first_candidate; | |
505 | ||
506 | if (!router) | |
507 | goto out; | |
508 | ||
509 | /* selected should point to the next element | |
510 | * after the current router */ | |
511 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
512 | /* this is a list_move(), which unfortunately | |
513 | * does not exist as rcu version */ | |
514 | list_del_rcu(&primary_orig->bond_list); | |
515 | list_add_rcu(&primary_orig->bond_list, | |
516 | &router->bonding_list); | |
517 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
518 | ||
519 | out: | |
520 | rcu_read_unlock(); | |
521 | return router; | |
522 | } | |
523 | ||
524 | /* Interface Alternating: Use the best of the | |
525 | * remaining candidates which are not using | |
526 | * this interface. | |
527 | * | |
528 | * Increases the returned router's refcount */ | |
529 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
747e4221 | 530 | const struct hard_iface *recv_if) |
55158629 LL |
531 | { |
532 | struct neigh_node *tmp_neigh_node; | |
533 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
534 | ||
535 | rcu_read_lock(); | |
536 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
537 | bonding_list) { | |
538 | if (!first_candidate) | |
539 | first_candidate = tmp_neigh_node; | |
540 | ||
541 | /* recv_if == NULL on the first node. */ | |
542 | if (tmp_neigh_node->if_incoming == recv_if) | |
543 | continue; | |
544 | ||
545 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
546 | continue; | |
547 | ||
548 | /* if we don't have a router yet | |
549 | * or this one is better, choose it. */ | |
550 | if ((!router) || | |
551 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
552 | /* decrement refcount of | |
553 | * previously selected router */ | |
554 | if (router) | |
555 | neigh_node_free_ref(router); | |
556 | ||
557 | router = tmp_neigh_node; | |
558 | atomic_inc_not_zero(&router->refcount); | |
559 | } | |
560 | ||
561 | neigh_node_free_ref(tmp_neigh_node); | |
562 | } | |
563 | ||
564 | /* use the first candidate if nothing was found. */ | |
565 | if (!router && first_candidate && | |
566 | atomic_inc_not_zero(&first_candidate->refcount)) | |
567 | router = first_candidate; | |
568 | ||
569 | rcu_read_unlock(); | |
570 | return router; | |
571 | } | |
572 | ||
a73105b8 AQ |
573 | int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if) |
574 | { | |
575 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
576 | struct tt_query_packet *tt_query; | |
8b7342d6 | 577 | uint16_t tt_len; |
a73105b8 AQ |
578 | struct ethhdr *ethhdr; |
579 | ||
580 | /* drop packet if it has not necessary minimum size */ | |
581 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) | |
582 | goto out; | |
583 | ||
584 | /* I could need to modify it */ | |
585 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) | |
586 | goto out; | |
587 | ||
588 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
589 | ||
590 | /* packet with unicast indication but broadcast recipient */ | |
591 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
592 | goto out; | |
593 | ||
594 | /* packet with broadcast sender address */ | |
595 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
596 | goto out; | |
597 | ||
598 | tt_query = (struct tt_query_packet *)skb->data; | |
599 | ||
600 | tt_query->tt_data = ntohs(tt_query->tt_data); | |
601 | ||
602 | switch (tt_query->flags & TT_QUERY_TYPE_MASK) { | |
603 | case TT_REQUEST: | |
604 | /* If we cannot provide an answer the tt_request is | |
605 | * forwarded */ | |
606 | if (!send_tt_response(bat_priv, tt_query)) { | |
607 | bat_dbg(DBG_TT, bat_priv, | |
608 | "Routing TT_REQUEST to %pM [%c]\n", | |
609 | tt_query->dst, | |
610 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
611 | tt_query->tt_data = htons(tt_query->tt_data); | |
612 | return route_unicast_packet(skb, recv_if); | |
613 | } | |
614 | break; | |
615 | case TT_RESPONSE: | |
dc58fe32 AQ |
616 | if (is_my_mac(tt_query->dst)) { |
617 | /* packet needs to be linearized to access the TT | |
618 | * changes */ | |
619 | if (skb_linearize(skb) < 0) | |
620 | goto out; | |
a73105b8 | 621 | |
8b7342d6 AQ |
622 | tt_len = tt_query->tt_data * sizeof(struct tt_change); |
623 | ||
624 | /* Ensure we have all the claimed data */ | |
625 | if (unlikely(skb_headlen(skb) < | |
69497c17 | 626 | sizeof(struct tt_query_packet) + tt_len)) |
8b7342d6 AQ |
627 | goto out; |
628 | ||
a73105b8 | 629 | handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 630 | } else { |
a73105b8 AQ |
631 | bat_dbg(DBG_TT, bat_priv, |
632 | "Routing TT_RESPONSE to %pM [%c]\n", | |
633 | tt_query->dst, | |
634 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
635 | tt_query->tt_data = htons(tt_query->tt_data); | |
636 | return route_unicast_packet(skb, recv_if); | |
637 | } | |
638 | break; | |
639 | } | |
640 | ||
641 | out: | |
642 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
643 | return NET_RX_DROP; | |
644 | } | |
645 | ||
cc47f66e AQ |
646 | int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
647 | { | |
648 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
649 | struct roam_adv_packet *roam_adv_packet; | |
650 | struct orig_node *orig_node; | |
651 | struct ethhdr *ethhdr; | |
652 | ||
653 | /* drop packet if it has not necessary minimum size */ | |
654 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) | |
655 | goto out; | |
656 | ||
657 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
658 | ||
659 | /* packet with unicast indication but broadcast recipient */ | |
660 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
661 | goto out; | |
662 | ||
663 | /* packet with broadcast sender address */ | |
664 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
665 | goto out; | |
666 | ||
667 | roam_adv_packet = (struct roam_adv_packet *)skb->data; | |
668 | ||
669 | if (!is_my_mac(roam_adv_packet->dst)) | |
670 | return route_unicast_packet(skb, recv_if); | |
671 | ||
672 | orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); | |
673 | if (!orig_node) | |
674 | goto out; | |
675 | ||
86ceb360 SE |
676 | bat_dbg(DBG_TT, bat_priv, |
677 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
678 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e AQ |
679 | |
680 | tt_global_add(bat_priv, orig_node, roam_adv_packet->client, | |
bc279080 | 681 | atomic_read(&orig_node->last_ttvn) + 1, true, false); |
cc47f66e AQ |
682 | |
683 | /* Roaming phase starts: I have new information but the ttvn has not | |
684 | * been incremented yet. This flag will make me check all the incoming | |
685 | * packets for the correct destination. */ | |
686 | bat_priv->tt_poss_change = true; | |
687 | ||
688 | orig_node_free_ref(orig_node); | |
689 | out: | |
690 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
691 | return NET_RX_DROP; | |
692 | } | |
693 | ||
c6c8fea2 | 694 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
695 | * bonding if possible. increases the found neighbors |
696 | * refcount.*/ | |
c6c8fea2 SE |
697 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
698 | struct orig_node *orig_node, | |
747e4221 | 699 | const struct hard_iface *recv_if) |
c6c8fea2 SE |
700 | { |
701 | struct orig_node *primary_orig_node; | |
702 | struct orig_node *router_orig; | |
55158629 | 703 | struct neigh_node *router; |
c6c8fea2 SE |
704 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
705 | int bonding_enabled; | |
706 | ||
707 | if (!orig_node) | |
708 | return NULL; | |
709 | ||
e1a5382f LL |
710 | router = orig_node_get_router(orig_node); |
711 | if (!router) | |
01df2b65 | 712 | goto err; |
c6c8fea2 SE |
713 | |
714 | /* without bonding, the first node should | |
715 | * always choose the default router. */ | |
c6c8fea2 SE |
716 | bonding_enabled = atomic_read(&bat_priv->bonding); |
717 | ||
a4c135c5 SW |
718 | rcu_read_lock(); |
719 | /* select default router to output */ | |
e1a5382f | 720 | router_orig = router->orig_node; |
01df2b65 ML |
721 | if (!router_orig) |
722 | goto err_unlock; | |
a4c135c5 | 723 | |
a4c135c5 SW |
724 | if ((!recv_if) && (!bonding_enabled)) |
725 | goto return_router; | |
c6c8fea2 SE |
726 | |
727 | /* if we have something in the primary_addr, we can search | |
728 | * for a potential bonding candidate. */ | |
39901e71 | 729 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 730 | goto return_router; |
c6c8fea2 SE |
731 | |
732 | /* find the orig_node which has the primary interface. might | |
733 | * even be the same as our router_orig in many cases */ | |
734 | ||
39901e71 | 735 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
736 | primary_orig_node = router_orig; |
737 | } else { | |
7aadf889 ML |
738 | primary_orig_node = orig_hash_find(bat_priv, |
739 | router_orig->primary_addr); | |
c6c8fea2 | 740 | if (!primary_orig_node) |
a4c135c5 | 741 | goto return_router; |
7aadf889 | 742 | |
7b36e8ee | 743 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
744 | } |
745 | ||
746 | /* with less than 2 candidates, we can't do any | |
747 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
748 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
749 | goto return_router; | |
c6c8fea2 | 750 | |
c6c8fea2 SE |
751 | /* all nodes between should choose a candidate which |
752 | * is is not on the interface where the packet came | |
753 | * in. */ | |
a4c135c5 | 754 | |
44524fcd | 755 | neigh_node_free_ref(router); |
c6c8fea2 | 756 | |
55158629 LL |
757 | if (bonding_enabled) |
758 | router = find_bond_router(primary_orig_node, recv_if); | |
759 | else | |
760 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 761 | |
a4c135c5 | 762 | return_router: |
e2cbc11c AQ |
763 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
764 | goto err_unlock; | |
765 | ||
a4c135c5 | 766 | rcu_read_unlock(); |
c6c8fea2 | 767 | return router; |
01df2b65 ML |
768 | err_unlock: |
769 | rcu_read_unlock(); | |
770 | err: | |
771 | if (router) | |
772 | neigh_node_free_ref(router); | |
773 | return NULL; | |
c6c8fea2 SE |
774 | } |
775 | ||
776 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
777 | { | |
778 | struct ethhdr *ethhdr; | |
779 | ||
780 | /* drop packet if it has not necessary minimum size */ | |
781 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
782 | return -1; | |
783 | ||
784 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
785 | ||
786 | /* packet with unicast indication but broadcast recipient */ | |
787 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
788 | return -1; | |
789 | ||
790 | /* packet with broadcast sender address */ | |
791 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
792 | return -1; | |
793 | ||
794 | /* not for me */ | |
795 | if (!is_my_mac(ethhdr->h_dest)) | |
796 | return -1; | |
797 | ||
798 | return 0; | |
799 | } | |
800 | ||
7cefb149 | 801 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
802 | { |
803 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
804 | struct orig_node *orig_node = NULL; |
805 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
806 | struct unicast_packet *unicast_packet; |
807 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 808 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
809 | struct sk_buff *new_skb; |
810 | ||
811 | unicast_packet = (struct unicast_packet *)skb->data; | |
812 | ||
813 | /* TTL exceeded */ | |
76543d14 | 814 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
815 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
816 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 817 | goto out; |
c6c8fea2 SE |
818 | } |
819 | ||
820 | /* get routing information */ | |
7aadf889 ML |
821 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
822 | ||
44524fcd | 823 | if (!orig_node) |
b5a6f69c | 824 | goto out; |
c6c8fea2 | 825 | |
a4c135c5 | 826 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 827 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 828 | |
d0072609 | 829 | if (!neigh_node) |
44524fcd | 830 | goto out; |
c6c8fea2 SE |
831 | |
832 | /* create a copy of the skb, if needed, to modify it. */ | |
833 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 834 | goto out; |
c6c8fea2 SE |
835 | |
836 | unicast_packet = (struct unicast_packet *)skb->data; | |
837 | ||
76543d14 | 838 | if (unicast_packet->header.packet_type == BAT_UNICAST && |
c6c8fea2 | 839 | atomic_read(&bat_priv->fragmentation) && |
d0072609 ML |
840 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
841 | ret = frag_send_skb(skb, bat_priv, | |
842 | neigh_node->if_incoming, neigh_node->addr); | |
843 | goto out; | |
844 | } | |
c6c8fea2 | 845 | |
76543d14 | 846 | if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG && |
d0072609 | 847 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
848 | |
849 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
850 | ||
851 | if (ret == NET_RX_DROP) | |
44524fcd | 852 | goto out; |
c6c8fea2 SE |
853 | |
854 | /* packet was buffered for late merge */ | |
44524fcd ML |
855 | if (!new_skb) { |
856 | ret = NET_RX_SUCCESS; | |
857 | goto out; | |
858 | } | |
c6c8fea2 SE |
859 | |
860 | skb = new_skb; | |
861 | unicast_packet = (struct unicast_packet *)skb->data; | |
862 | } | |
863 | ||
864 | /* decrement ttl */ | |
76543d14 | 865 | unicast_packet->header.ttl--; |
c6c8fea2 SE |
866 | |
867 | /* route it */ | |
d0072609 | 868 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 869 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 870 | |
44524fcd ML |
871 | out: |
872 | if (neigh_node) | |
873 | neigh_node_free_ref(neigh_node); | |
874 | if (orig_node) | |
7b36e8ee | 875 | orig_node_free_ref(orig_node); |
44524fcd | 876 | return ret; |
c6c8fea2 SE |
877 | } |
878 | ||
a73105b8 AQ |
879 | static int check_unicast_ttvn(struct bat_priv *bat_priv, |
880 | struct sk_buff *skb) { | |
881 | uint8_t curr_ttvn; | |
882 | struct orig_node *orig_node; | |
883 | struct ethhdr *ethhdr; | |
884 | struct hard_iface *primary_if; | |
885 | struct unicast_packet *unicast_packet; | |
cc47f66e | 886 | bool tt_poss_change; |
a73105b8 AQ |
887 | |
888 | /* I could need to modify it */ | |
889 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) | |
890 | return 0; | |
891 | ||
892 | unicast_packet = (struct unicast_packet *)skb->data; | |
893 | ||
cc47f66e AQ |
894 | if (is_my_mac(unicast_packet->dest)) { |
895 | tt_poss_change = bat_priv->tt_poss_change; | |
a73105b8 | 896 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
cc47f66e | 897 | } else { |
a73105b8 AQ |
898 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
899 | ||
900 | if (!orig_node) | |
901 | return 0; | |
902 | ||
903 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 904 | tt_poss_change = orig_node->tt_poss_change; |
a73105b8 AQ |
905 | orig_node_free_ref(orig_node); |
906 | } | |
907 | ||
908 | /* Check whether I have to reroute the packet */ | |
cc47f66e | 909 | if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { |
a73105b8 AQ |
910 | /* Linearize the skb before accessing it */ |
911 | if (skb_linearize(skb) < 0) | |
912 | return 0; | |
913 | ||
914 | ethhdr = (struct ethhdr *)(skb->data + | |
915 | sizeof(struct unicast_packet)); | |
3d393e47 | 916 | orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest); |
a73105b8 AQ |
917 | |
918 | if (!orig_node) { | |
919 | if (!is_my_client(bat_priv, ethhdr->h_dest)) | |
920 | return 0; | |
921 | primary_if = primary_if_get_selected(bat_priv); | |
922 | if (!primary_if) | |
923 | return 0; | |
924 | memcpy(unicast_packet->dest, | |
925 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
926 | hardif_free_ref(primary_if); | |
927 | } else { | |
928 | memcpy(unicast_packet->dest, orig_node->orig, | |
929 | ETH_ALEN); | |
930 | curr_ttvn = (uint8_t) | |
931 | atomic_read(&orig_node->last_ttvn); | |
932 | orig_node_free_ref(orig_node); | |
933 | } | |
934 | ||
86ceb360 SE |
935 | bat_dbg(DBG_ROUTES, bat_priv, |
936 | "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n", | |
937 | unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest, | |
938 | unicast_packet->dest); | |
a73105b8 AQ |
939 | |
940 | unicast_packet->ttvn = curr_ttvn; | |
941 | } | |
942 | return 1; | |
943 | } | |
944 | ||
e6c10f43 | 945 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 | 946 | { |
a73105b8 | 947 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
c6c8fea2 | 948 | struct unicast_packet *unicast_packet; |
704509b8 | 949 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
950 | |
951 | if (check_unicast_packet(skb, hdr_size) < 0) | |
952 | return NET_RX_DROP; | |
953 | ||
a73105b8 AQ |
954 | if (!check_unicast_ttvn(bat_priv, skb)) |
955 | return NET_RX_DROP; | |
956 | ||
c6c8fea2 SE |
957 | unicast_packet = (struct unicast_packet *)skb->data; |
958 | ||
959 | /* packet for me */ | |
960 | if (is_my_mac(unicast_packet->dest)) { | |
961 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
962 | return NET_RX_SUCCESS; | |
963 | } | |
964 | ||
7cefb149 | 965 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
966 | } |
967 | ||
e6c10f43 | 968 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
969 | { |
970 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
971 | struct unicast_frag_packet *unicast_packet; | |
704509b8 | 972 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
973 | struct sk_buff *new_skb = NULL; |
974 | int ret; | |
975 | ||
976 | if (check_unicast_packet(skb, hdr_size) < 0) | |
977 | return NET_RX_DROP; | |
978 | ||
a73105b8 AQ |
979 | if (!check_unicast_ttvn(bat_priv, skb)) |
980 | return NET_RX_DROP; | |
981 | ||
c6c8fea2 SE |
982 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
983 | ||
984 | /* packet for me */ | |
985 | if (is_my_mac(unicast_packet->dest)) { | |
986 | ||
987 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
988 | ||
989 | if (ret == NET_RX_DROP) | |
990 | return NET_RX_DROP; | |
991 | ||
992 | /* packet was buffered for late merge */ | |
993 | if (!new_skb) | |
994 | return NET_RX_SUCCESS; | |
995 | ||
996 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
997 | sizeof(struct unicast_packet)); | |
998 | return NET_RX_SUCCESS; | |
999 | } | |
1000 | ||
7cefb149 | 1001 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1002 | } |
1003 | ||
1004 | ||
e6c10f43 | 1005 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1006 | { |
1007 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1008 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1009 | struct bcast_packet *bcast_packet; |
1010 | struct ethhdr *ethhdr; | |
704509b8 | 1011 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1012 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1013 | int32_t seq_diff; |
1014 | ||
1015 | /* drop packet if it has not necessary minimum size */ | |
1016 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1017 | goto out; |
c6c8fea2 SE |
1018 | |
1019 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1020 | ||
1021 | /* packet with broadcast indication but unicast recipient */ | |
1022 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1023 | goto out; |
c6c8fea2 SE |
1024 | |
1025 | /* packet with broadcast sender address */ | |
1026 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1027 | goto out; |
c6c8fea2 SE |
1028 | |
1029 | /* ignore broadcasts sent by myself */ | |
1030 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1031 | goto out; |
c6c8fea2 SE |
1032 | |
1033 | bcast_packet = (struct bcast_packet *)skb->data; | |
1034 | ||
1035 | /* ignore broadcasts originated by myself */ | |
1036 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1037 | goto out; |
c6c8fea2 | 1038 | |
76543d14 | 1039 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1040 | goto out; |
c6c8fea2 | 1041 | |
7aadf889 | 1042 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1043 | |
1044 | if (!orig_node) | |
b5a6f69c | 1045 | goto out; |
c6c8fea2 | 1046 | |
f3e0008f | 1047 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1048 | |
1049 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1050 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1051 | ntohl(bcast_packet->seqno))) | |
1052 | goto spin_unlock; | |
c6c8fea2 SE |
1053 | |
1054 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1055 | ||
1056 | /* check whether the packet is old and the host just restarted. */ | |
1057 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1058 | &orig_node->bcast_seqno_reset)) |
1059 | goto spin_unlock; | |
c6c8fea2 SE |
1060 | |
1061 | /* mark broadcast in flood history, update window position | |
1062 | * if required. */ | |
1063 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1064 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1065 | ||
f3e0008f | 1066 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1067 | |
c6c8fea2 | 1068 | /* rebroadcast packet */ |
8698529d | 1069 | add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 SE |
1070 | |
1071 | /* broadcast for me */ | |
1072 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1073 | ret = NET_RX_SUCCESS; |
1074 | goto out; | |
c6c8fea2 | 1075 | |
f3e0008f ML |
1076 | spin_unlock: |
1077 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1078 | out: |
1079 | if (orig_node) | |
7b36e8ee | 1080 | orig_node_free_ref(orig_node); |
f3e0008f | 1081 | return ret; |
c6c8fea2 SE |
1082 | } |
1083 | ||
e6c10f43 | 1084 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1085 | { |
1086 | struct vis_packet *vis_packet; | |
1087 | struct ethhdr *ethhdr; | |
1088 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
704509b8 | 1089 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1090 | |
1091 | /* keep skb linear */ | |
1092 | if (skb_linearize(skb) < 0) | |
1093 | return NET_RX_DROP; | |
1094 | ||
1095 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1096 | return NET_RX_DROP; | |
1097 | ||
1098 | vis_packet = (struct vis_packet *)skb->data; | |
1099 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1100 | ||
1101 | /* not for me */ | |
1102 | if (!is_my_mac(ethhdr->h_dest)) | |
1103 | return NET_RX_DROP; | |
1104 | ||
1105 | /* ignore own packets */ | |
1106 | if (is_my_mac(vis_packet->vis_orig)) | |
1107 | return NET_RX_DROP; | |
1108 | ||
1109 | if (is_my_mac(vis_packet->sender_orig)) | |
1110 | return NET_RX_DROP; | |
1111 | ||
1112 | switch (vis_packet->vis_type) { | |
1113 | case VIS_TYPE_SERVER_SYNC: | |
1114 | receive_server_sync_packet(bat_priv, vis_packet, | |
1115 | skb_headlen(skb)); | |
1116 | break; | |
1117 | ||
1118 | case VIS_TYPE_CLIENT_UPDATE: | |
1119 | receive_client_update_packet(bat_priv, vis_packet, | |
1120 | skb_headlen(skb)); | |
1121 | break; | |
1122 | ||
1123 | default: /* ignore unknown packet */ | |
1124 | break; | |
1125 | } | |
1126 | ||
1127 | /* We take a copy of the data in the packet, so we should | |
1128 | always free the skbuf. */ | |
1129 | return NET_RX_DROP; | |
1130 | } |