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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 | 31 | #include "unicast.h" |
23721387 | 32 | #include "bridge_loop_avoidance.h" |
c6c8fea2 | 33 | |
a7f6ee94 SW |
34 | static int route_unicast_packet(struct sk_buff *skb, |
35 | struct hard_iface *recv_if); | |
36 | ||
e6c10f43 | 37 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 38 | { |
e6c10f43 | 39 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 40 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 41 | struct hlist_node *node; |
c6c8fea2 | 42 | struct hlist_head *head; |
c6c8fea2 SE |
43 | struct orig_node *orig_node; |
44 | unsigned long *word; | |
c90681b8 | 45 | uint32_t i; |
c6c8fea2 SE |
46 | size_t word_index; |
47 | ||
c6c8fea2 SE |
48 | for (i = 0; i < hash->size; i++) { |
49 | head = &hash->table[i]; | |
50 | ||
fb778ea1 | 51 | rcu_read_lock(); |
7aadf889 | 52 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 53 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
e6c10f43 | 54 | word_index = hard_iface->if_num * NUM_WORDS; |
c6c8fea2 SE |
55 | word = &(orig_node->bcast_own[word_index]); |
56 | ||
57 | bit_get_packet(bat_priv, word, 1, 0); | |
e6c10f43 | 58 | orig_node->bcast_own_sum[hard_iface->if_num] = |
0079d2ce | 59 | bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE); |
2ae2daf6 | 60 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 61 | } |
fb778ea1 | 62 | rcu_read_unlock(); |
c6c8fea2 | 63 | } |
c6c8fea2 SE |
64 | } |
65 | ||
fc957275 ML |
66 | static void _update_route(struct bat_priv *bat_priv, |
67 | struct orig_node *orig_node, | |
68 | struct neigh_node *neigh_node) | |
c6c8fea2 | 69 | { |
e1a5382f LL |
70 | struct neigh_node *curr_router; |
71 | ||
72 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 73 | |
c6c8fea2 | 74 | /* route deleted */ |
e1a5382f | 75 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
76 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
77 | orig_node->orig); | |
2dafb49d | 78 | tt_global_del_orig(bat_priv, orig_node, |
7c64fd98 | 79 | "Deleted route towards originator"); |
c6c8fea2 | 80 | |
e1a5382f LL |
81 | /* route added */ |
82 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
83 | |
84 | bat_dbg(DBG_ROUTES, bat_priv, | |
85 | "Adding route towards: %pM (via %pM)\n", | |
86 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 87 | /* route changed */ |
bb899b89 | 88 | } else if (neigh_node && curr_router) { |
c6c8fea2 | 89 | bat_dbg(DBG_ROUTES, bat_priv, |
86ceb360 | 90 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
c6c8fea2 | 91 | orig_node->orig, neigh_node->addr, |
e1a5382f | 92 | curr_router->addr); |
c6c8fea2 SE |
93 | } |
94 | ||
e1a5382f LL |
95 | if (curr_router) |
96 | neigh_node_free_ref(curr_router); | |
97 | ||
98 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
99 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
100 | neigh_node = NULL; | |
e1a5382f LL |
101 | |
102 | spin_lock_bh(&orig_node->neigh_list_lock); | |
103 | rcu_assign_pointer(orig_node->router, neigh_node); | |
104 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
105 | ||
106 | /* decrease refcount of previous best neighbor */ | |
107 | if (curr_router) | |
108 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
109 | } |
110 | ||
fc957275 ML |
111 | void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
112 | struct neigh_node *neigh_node) | |
c6c8fea2 | 113 | { |
e1a5382f | 114 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
115 | |
116 | if (!orig_node) | |
e1a5382f LL |
117 | goto out; |
118 | ||
119 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 120 | |
e1a5382f | 121 | if (router != neigh_node) |
fc957275 | 122 | _update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
123 | |
124 | out: | |
125 | if (router) | |
126 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
127 | } |
128 | ||
a4c135c5 SW |
129 | /* caller must hold the neigh_list_lock */ |
130 | void bonding_candidate_del(struct orig_node *orig_node, | |
131 | struct neigh_node *neigh_node) | |
132 | { | |
133 | /* this neighbor is not part of our candidate list */ | |
134 | if (list_empty(&neigh_node->bonding_list)) | |
135 | goto out; | |
136 | ||
137 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 138 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 139 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
140 | atomic_dec(&orig_node->bond_candidates); |
141 | ||
142 | out: | |
143 | return; | |
144 | } | |
145 | ||
fc957275 ML |
146 | void bonding_candidate_add(struct orig_node *orig_node, |
147 | struct neigh_node *neigh_node) | |
a4c135c5 SW |
148 | { |
149 | struct hlist_node *node; | |
e1a5382f LL |
150 | struct neigh_node *tmp_neigh_node, *router = NULL; |
151 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
152 | |
153 | spin_lock_bh(&orig_node->neigh_list_lock); | |
154 | ||
155 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
156 | if (!compare_eth(orig_node->orig, |
157 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
158 | goto candidate_del; |
159 | ||
e1a5382f LL |
160 | router = orig_node_get_router(orig_node); |
161 | if (!router) | |
a4c135c5 SW |
162 | goto candidate_del; |
163 | ||
a4c135c5 | 164 | /* ... and is good enough to be considered */ |
e1a5382f | 165 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
166 | goto candidate_del; |
167 | ||
168 | /** | |
169 | * check if we have another candidate with the same mac address or | |
170 | * interface. If we do, we won't select this candidate because of | |
171 | * possible interference. | |
172 | */ | |
173 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
174 | &orig_node->neigh_list, list) { | |
175 | ||
176 | if (tmp_neigh_node == neigh_node) | |
177 | continue; | |
178 | ||
179 | /* we only care if the other candidate is even | |
180 | * considered as candidate. */ | |
181 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
182 | continue; | |
183 | ||
184 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 185 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
186 | interference_candidate = 1; |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | /* don't care further if it is an interference candidate */ | |
192 | if (interference_candidate) | |
193 | goto candidate_del; | |
194 | ||
195 | /* this neighbor already is part of our candidate list */ | |
196 | if (!list_empty(&neigh_node->bonding_list)) | |
197 | goto out; | |
198 | ||
44524fcd ML |
199 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
200 | goto out; | |
201 | ||
a4c135c5 | 202 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
203 | atomic_inc(&orig_node->bond_candidates); |
204 | goto out; | |
205 | ||
206 | candidate_del: | |
207 | bonding_candidate_del(orig_node, neigh_node); | |
208 | ||
209 | out: | |
210 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
211 | |
212 | if (router) | |
213 | neigh_node_free_ref(router); | |
a4c135c5 SW |
214 | } |
215 | ||
216 | /* copy primary address for bonding */ | |
fc957275 ML |
217 | void bonding_save_primary(const struct orig_node *orig_node, |
218 | struct orig_node *orig_neigh_node, | |
219 | const struct batman_ogm_packet *batman_ogm_packet) | |
a4c135c5 | 220 | { |
b6da4bf5 | 221 | if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
222 | return; |
223 | ||
224 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
225 | } | |
226 | ||
c6c8fea2 SE |
227 | /* checks whether the host restarted and is in the protection time. |
228 | * returns: | |
229 | * 0 if the packet is to be accepted | |
230 | * 1 if the packet is to be ignored. | |
231 | */ | |
fc957275 ML |
232 | int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
233 | unsigned long *last_reset) | |
c6c8fea2 | 234 | { |
7c64fd98 SE |
235 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) || |
236 | (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
032b7969 | 237 | if (has_timed_out(*last_reset, RESET_PROTECTION_MS)) { |
c6c8fea2 SE |
238 | |
239 | *last_reset = jiffies; | |
240 | bat_dbg(DBG_BATMAN, bat_priv, | |
241 | "old packet received, start protection\n"); | |
242 | ||
243 | return 0; | |
96741ade | 244 | } else { |
c6c8fea2 | 245 | return 1; |
96741ade | 246 | } |
c6c8fea2 SE |
247 | } |
248 | return 0; | |
249 | } | |
250 | ||
fc957275 | 251 | int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 252 | { |
01c4224b | 253 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 SE |
254 | struct ethhdr *ethhdr; |
255 | ||
256 | /* drop packet if it has not necessary minimum size */ | |
b6da4bf5 | 257 | if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN))) |
c6c8fea2 SE |
258 | return NET_RX_DROP; |
259 | ||
260 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
261 | ||
262 | /* packet with broadcast indication but unicast recipient */ | |
263 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
264 | return NET_RX_DROP; | |
265 | ||
266 | /* packet with broadcast sender address */ | |
267 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
268 | return NET_RX_DROP; | |
269 | ||
270 | /* create a copy of the skb, if needed, to modify it. */ | |
271 | if (skb_cow(skb, 0) < 0) | |
272 | return NET_RX_DROP; | |
273 | ||
274 | /* keep skb linear */ | |
275 | if (skb_linearize(skb) < 0) | |
276 | return NET_RX_DROP; | |
277 | ||
01c4224b | 278 | bat_priv->bat_algo_ops->bat_ogm_receive(hard_iface, skb); |
c6c8fea2 SE |
279 | |
280 | kfree_skb(skb); | |
281 | return NET_RX_SUCCESS; | |
282 | } | |
283 | ||
284 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
285 | struct sk_buff *skb, size_t icmp_len) | |
286 | { | |
32ae9b22 | 287 | struct hard_iface *primary_if = NULL; |
44524fcd | 288 | struct orig_node *orig_node = NULL; |
e1a5382f | 289 | struct neigh_node *router = NULL; |
c6c8fea2 | 290 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 291 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
292 | |
293 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
294 | |
295 | /* add data to device queue */ | |
296 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
297 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 298 | goto out; |
c6c8fea2 SE |
299 | } |
300 | ||
32ae9b22 ML |
301 | primary_if = primary_if_get_selected(bat_priv); |
302 | if (!primary_if) | |
44524fcd | 303 | goto out; |
c6c8fea2 SE |
304 | |
305 | /* answer echo request (ping) */ | |
306 | /* get routing information */ | |
7aadf889 | 307 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 308 | if (!orig_node) |
e1a5382f | 309 | goto out; |
c6c8fea2 | 310 | |
e1a5382f LL |
311 | router = orig_node_get_router(orig_node); |
312 | if (!router) | |
313 | goto out; | |
c6c8fea2 | 314 | |
44524fcd ML |
315 | /* create a copy of the skb, if needed, to modify it. */ |
316 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
317 | goto out; | |
318 | ||
319 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
320 | ||
321 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 322 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 323 | icmp_packet->msg_type = ECHO_REPLY; |
76543d14 | 324 | icmp_packet->header.ttl = TTL; |
44524fcd | 325 | |
e1a5382f | 326 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 327 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 328 | |
44524fcd | 329 | out: |
32ae9b22 ML |
330 | if (primary_if) |
331 | hardif_free_ref(primary_if); | |
e1a5382f LL |
332 | if (router) |
333 | neigh_node_free_ref(router); | |
44524fcd | 334 | if (orig_node) |
7b36e8ee | 335 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
336 | return ret; |
337 | } | |
338 | ||
339 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 340 | struct sk_buff *skb) |
c6c8fea2 | 341 | { |
32ae9b22 | 342 | struct hard_iface *primary_if = NULL; |
44524fcd | 343 | struct orig_node *orig_node = NULL; |
e1a5382f | 344 | struct neigh_node *router = NULL; |
c6c8fea2 | 345 | struct icmp_packet *icmp_packet; |
44524fcd | 346 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
347 | |
348 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
349 | |
350 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
351 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
86ceb360 SE |
352 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
353 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 354 | goto out; |
c6c8fea2 SE |
355 | } |
356 | ||
32ae9b22 ML |
357 | primary_if = primary_if_get_selected(bat_priv); |
358 | if (!primary_if) | |
44524fcd | 359 | goto out; |
c6c8fea2 SE |
360 | |
361 | /* get routing information */ | |
7aadf889 | 362 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 363 | if (!orig_node) |
e1a5382f | 364 | goto out; |
c6c8fea2 | 365 | |
e1a5382f LL |
366 | router = orig_node_get_router(orig_node); |
367 | if (!router) | |
368 | goto out; | |
c6c8fea2 | 369 | |
44524fcd ML |
370 | /* create a copy of the skb, if needed, to modify it. */ |
371 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
372 | goto out; | |
c6c8fea2 | 373 | |
44524fcd | 374 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 375 | |
44524fcd | 376 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 377 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd | 378 | icmp_packet->msg_type = TTL_EXCEEDED; |
76543d14 | 379 | icmp_packet->header.ttl = TTL; |
44524fcd | 380 | |
e1a5382f | 381 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 382 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 383 | |
44524fcd | 384 | out: |
32ae9b22 ML |
385 | if (primary_if) |
386 | hardif_free_ref(primary_if); | |
e1a5382f LL |
387 | if (router) |
388 | neigh_node_free_ref(router); | |
44524fcd | 389 | if (orig_node) |
7b36e8ee | 390 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
391 | return ret; |
392 | } | |
393 | ||
394 | ||
e6c10f43 | 395 | int recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
396 | { |
397 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
398 | struct icmp_packet_rr *icmp_packet; | |
399 | struct ethhdr *ethhdr; | |
44524fcd | 400 | struct orig_node *orig_node = NULL; |
e1a5382f | 401 | struct neigh_node *router = NULL; |
c6c8fea2 | 402 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 403 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
404 | |
405 | /** | |
406 | * we truncate all incoming icmp packets if they don't match our size | |
407 | */ | |
408 | if (skb->len >= sizeof(struct icmp_packet_rr)) | |
409 | hdr_size = sizeof(struct icmp_packet_rr); | |
410 | ||
411 | /* drop packet if it has not necessary minimum size */ | |
412 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 413 | goto out; |
c6c8fea2 SE |
414 | |
415 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
416 | ||
417 | /* packet with unicast indication but broadcast recipient */ | |
418 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 419 | goto out; |
c6c8fea2 SE |
420 | |
421 | /* packet with broadcast sender address */ | |
422 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 423 | goto out; |
c6c8fea2 SE |
424 | |
425 | /* not for me */ | |
426 | if (!is_my_mac(ethhdr->h_dest)) | |
44524fcd | 427 | goto out; |
c6c8fea2 SE |
428 | |
429 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
430 | ||
431 | /* add record route information if not full */ | |
432 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
433 | (icmp_packet->rr_cur < BAT_RR_LEN)) { | |
434 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), | |
7c64fd98 | 435 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
436 | icmp_packet->rr_cur++; |
437 | } | |
438 | ||
439 | /* packet for me */ | |
440 | if (is_my_mac(icmp_packet->dst)) | |
441 | return recv_my_icmp_packet(bat_priv, skb, hdr_size); | |
442 | ||
443 | /* TTL exceeded */ | |
76543d14 | 444 | if (icmp_packet->header.ttl < 2) |
74ef1153 | 445 | return recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 446 | |
c6c8fea2 | 447 | /* get routing information */ |
7aadf889 | 448 | orig_node = orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 449 | if (!orig_node) |
e1a5382f | 450 | goto out; |
c6c8fea2 | 451 | |
e1a5382f LL |
452 | router = orig_node_get_router(orig_node); |
453 | if (!router) | |
454 | goto out; | |
c6c8fea2 | 455 | |
44524fcd ML |
456 | /* create a copy of the skb, if needed, to modify it. */ |
457 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
458 | goto out; | |
c6c8fea2 | 459 | |
44524fcd | 460 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 461 | |
44524fcd | 462 | /* decrement ttl */ |
76543d14 | 463 | icmp_packet->header.ttl--; |
44524fcd ML |
464 | |
465 | /* route it */ | |
e1a5382f | 466 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 467 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 468 | |
44524fcd | 469 | out: |
e1a5382f LL |
470 | if (router) |
471 | neigh_node_free_ref(router); | |
44524fcd | 472 | if (orig_node) |
7b36e8ee | 473 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
474 | return ret; |
475 | } | |
476 | ||
55158629 LL |
477 | /* In the bonding case, send the packets in a round |
478 | * robin fashion over the remaining interfaces. | |
479 | * | |
480 | * This method rotates the bonding list and increases the | |
481 | * returned router's refcount. */ | |
482 | static struct neigh_node *find_bond_router(struct orig_node *primary_orig, | |
747e4221 | 483 | const struct hard_iface *recv_if) |
55158629 LL |
484 | { |
485 | struct neigh_node *tmp_neigh_node; | |
486 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
487 | ||
488 | rcu_read_lock(); | |
489 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
490 | bonding_list) { | |
491 | if (!first_candidate) | |
492 | first_candidate = tmp_neigh_node; | |
493 | ||
494 | /* recv_if == NULL on the first node. */ | |
495 | if (tmp_neigh_node->if_incoming == recv_if) | |
496 | continue; | |
497 | ||
498 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
499 | continue; | |
500 | ||
501 | router = tmp_neigh_node; | |
502 | break; | |
503 | } | |
504 | ||
505 | /* use the first candidate if nothing was found. */ | |
506 | if (!router && first_candidate && | |
507 | atomic_inc_not_zero(&first_candidate->refcount)) | |
508 | router = first_candidate; | |
509 | ||
510 | if (!router) | |
511 | goto out; | |
512 | ||
513 | /* selected should point to the next element | |
514 | * after the current router */ | |
515 | spin_lock_bh(&primary_orig->neigh_list_lock); | |
516 | /* this is a list_move(), which unfortunately | |
517 | * does not exist as rcu version */ | |
518 | list_del_rcu(&primary_orig->bond_list); | |
519 | list_add_rcu(&primary_orig->bond_list, | |
520 | &router->bonding_list); | |
521 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
522 | ||
523 | out: | |
524 | rcu_read_unlock(); | |
525 | return router; | |
526 | } | |
527 | ||
528 | /* Interface Alternating: Use the best of the | |
529 | * remaining candidates which are not using | |
530 | * this interface. | |
531 | * | |
532 | * Increases the returned router's refcount */ | |
533 | static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig, | |
747e4221 | 534 | const struct hard_iface *recv_if) |
55158629 LL |
535 | { |
536 | struct neigh_node *tmp_neigh_node; | |
537 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
538 | ||
539 | rcu_read_lock(); | |
540 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
541 | bonding_list) { | |
542 | if (!first_candidate) | |
543 | first_candidate = tmp_neigh_node; | |
544 | ||
545 | /* recv_if == NULL on the first node. */ | |
546 | if (tmp_neigh_node->if_incoming == recv_if) | |
547 | continue; | |
548 | ||
549 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
550 | continue; | |
551 | ||
552 | /* if we don't have a router yet | |
553 | * or this one is better, choose it. */ | |
554 | if ((!router) || | |
555 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
556 | /* decrement refcount of | |
557 | * previously selected router */ | |
558 | if (router) | |
559 | neigh_node_free_ref(router); | |
560 | ||
561 | router = tmp_neigh_node; | |
562 | atomic_inc_not_zero(&router->refcount); | |
563 | } | |
564 | ||
565 | neigh_node_free_ref(tmp_neigh_node); | |
566 | } | |
567 | ||
568 | /* use the first candidate if nothing was found. */ | |
569 | if (!router && first_candidate && | |
570 | atomic_inc_not_zero(&first_candidate->refcount)) | |
571 | router = first_candidate; | |
572 | ||
573 | rcu_read_unlock(); | |
574 | return router; | |
575 | } | |
576 | ||
a73105b8 AQ |
577 | int recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if) |
578 | { | |
579 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
580 | struct tt_query_packet *tt_query; | |
8b7342d6 | 581 | uint16_t tt_len; |
a73105b8 AQ |
582 | struct ethhdr *ethhdr; |
583 | ||
584 | /* drop packet if it has not necessary minimum size */ | |
585 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) | |
586 | goto out; | |
587 | ||
588 | /* I could need to modify it */ | |
589 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) | |
590 | goto out; | |
591 | ||
592 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
593 | ||
594 | /* packet with unicast indication but broadcast recipient */ | |
595 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
596 | goto out; | |
597 | ||
598 | /* packet with broadcast sender address */ | |
599 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
600 | goto out; | |
601 | ||
602 | tt_query = (struct tt_query_packet *)skb->data; | |
603 | ||
604 | tt_query->tt_data = ntohs(tt_query->tt_data); | |
605 | ||
606 | switch (tt_query->flags & TT_QUERY_TYPE_MASK) { | |
607 | case TT_REQUEST: | |
608 | /* If we cannot provide an answer the tt_request is | |
609 | * forwarded */ | |
610 | if (!send_tt_response(bat_priv, tt_query)) { | |
611 | bat_dbg(DBG_TT, bat_priv, | |
612 | "Routing TT_REQUEST to %pM [%c]\n", | |
613 | tt_query->dst, | |
614 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
615 | tt_query->tt_data = htons(tt_query->tt_data); | |
616 | return route_unicast_packet(skb, recv_if); | |
617 | } | |
618 | break; | |
619 | case TT_RESPONSE: | |
dc58fe32 AQ |
620 | if (is_my_mac(tt_query->dst)) { |
621 | /* packet needs to be linearized to access the TT | |
622 | * changes */ | |
623 | if (skb_linearize(skb) < 0) | |
624 | goto out; | |
a73105b8 | 625 | |
8b7342d6 AQ |
626 | tt_len = tt_query->tt_data * sizeof(struct tt_change); |
627 | ||
628 | /* Ensure we have all the claimed data */ | |
629 | if (unlikely(skb_headlen(skb) < | |
69497c17 | 630 | sizeof(struct tt_query_packet) + tt_len)) |
8b7342d6 AQ |
631 | goto out; |
632 | ||
a73105b8 | 633 | handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 634 | } else { |
a73105b8 AQ |
635 | bat_dbg(DBG_TT, bat_priv, |
636 | "Routing TT_RESPONSE to %pM [%c]\n", | |
637 | tt_query->dst, | |
638 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
639 | tt_query->tt_data = htons(tt_query->tt_data); | |
640 | return route_unicast_packet(skb, recv_if); | |
641 | } | |
642 | break; | |
643 | } | |
644 | ||
645 | out: | |
646 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
647 | return NET_RX_DROP; | |
648 | } | |
649 | ||
cc47f66e AQ |
650 | int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
651 | { | |
652 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
653 | struct roam_adv_packet *roam_adv_packet; | |
654 | struct orig_node *orig_node; | |
655 | struct ethhdr *ethhdr; | |
656 | ||
657 | /* drop packet if it has not necessary minimum size */ | |
658 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) | |
659 | goto out; | |
660 | ||
661 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
662 | ||
663 | /* packet with unicast indication but broadcast recipient */ | |
664 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
665 | goto out; | |
666 | ||
667 | /* packet with broadcast sender address */ | |
668 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
669 | goto out; | |
670 | ||
671 | roam_adv_packet = (struct roam_adv_packet *)skb->data; | |
672 | ||
673 | if (!is_my_mac(roam_adv_packet->dst)) | |
674 | return route_unicast_packet(skb, recv_if); | |
675 | ||
20ff9d59 SW |
676 | /* check if it is a backbone gateway. we don't accept |
677 | * roaming advertisement from it, as it has the same | |
678 | * entries as we have. | |
679 | */ | |
680 | if (bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) | |
681 | goto out; | |
682 | ||
cc47f66e AQ |
683 | orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); |
684 | if (!orig_node) | |
685 | goto out; | |
686 | ||
86ceb360 SE |
687 | bat_dbg(DBG_TT, bat_priv, |
688 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
689 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e AQ |
690 | |
691 | tt_global_add(bat_priv, orig_node, roam_adv_packet->client, | |
bc279080 | 692 | atomic_read(&orig_node->last_ttvn) + 1, true, false); |
cc47f66e AQ |
693 | |
694 | /* Roaming phase starts: I have new information but the ttvn has not | |
695 | * been incremented yet. This flag will make me check all the incoming | |
696 | * packets for the correct destination. */ | |
697 | bat_priv->tt_poss_change = true; | |
698 | ||
699 | orig_node_free_ref(orig_node); | |
700 | out: | |
701 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
702 | return NET_RX_DROP; | |
703 | } | |
704 | ||
c6c8fea2 | 705 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
706 | * bonding if possible. increases the found neighbors |
707 | * refcount.*/ | |
c6c8fea2 SE |
708 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
709 | struct orig_node *orig_node, | |
747e4221 | 710 | const struct hard_iface *recv_if) |
c6c8fea2 SE |
711 | { |
712 | struct orig_node *primary_orig_node; | |
713 | struct orig_node *router_orig; | |
55158629 | 714 | struct neigh_node *router; |
c6c8fea2 SE |
715 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
716 | int bonding_enabled; | |
717 | ||
718 | if (!orig_node) | |
719 | return NULL; | |
720 | ||
e1a5382f LL |
721 | router = orig_node_get_router(orig_node); |
722 | if (!router) | |
01df2b65 | 723 | goto err; |
c6c8fea2 SE |
724 | |
725 | /* without bonding, the first node should | |
726 | * always choose the default router. */ | |
c6c8fea2 SE |
727 | bonding_enabled = atomic_read(&bat_priv->bonding); |
728 | ||
a4c135c5 SW |
729 | rcu_read_lock(); |
730 | /* select default router to output */ | |
e1a5382f | 731 | router_orig = router->orig_node; |
01df2b65 ML |
732 | if (!router_orig) |
733 | goto err_unlock; | |
a4c135c5 | 734 | |
a4c135c5 SW |
735 | if ((!recv_if) && (!bonding_enabled)) |
736 | goto return_router; | |
c6c8fea2 SE |
737 | |
738 | /* if we have something in the primary_addr, we can search | |
739 | * for a potential bonding candidate. */ | |
39901e71 | 740 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 741 | goto return_router; |
c6c8fea2 SE |
742 | |
743 | /* find the orig_node which has the primary interface. might | |
744 | * even be the same as our router_orig in many cases */ | |
745 | ||
39901e71 | 746 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
747 | primary_orig_node = router_orig; |
748 | } else { | |
7aadf889 ML |
749 | primary_orig_node = orig_hash_find(bat_priv, |
750 | router_orig->primary_addr); | |
c6c8fea2 | 751 | if (!primary_orig_node) |
a4c135c5 | 752 | goto return_router; |
7aadf889 | 753 | |
7b36e8ee | 754 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
755 | } |
756 | ||
757 | /* with less than 2 candidates, we can't do any | |
758 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
759 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
760 | goto return_router; | |
c6c8fea2 | 761 | |
c6c8fea2 SE |
762 | /* all nodes between should choose a candidate which |
763 | * is is not on the interface where the packet came | |
764 | * in. */ | |
a4c135c5 | 765 | |
44524fcd | 766 | neigh_node_free_ref(router); |
c6c8fea2 | 767 | |
55158629 LL |
768 | if (bonding_enabled) |
769 | router = find_bond_router(primary_orig_node, recv_if); | |
770 | else | |
771 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 772 | |
a4c135c5 | 773 | return_router: |
e2cbc11c AQ |
774 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
775 | goto err_unlock; | |
776 | ||
a4c135c5 | 777 | rcu_read_unlock(); |
c6c8fea2 | 778 | return router; |
01df2b65 ML |
779 | err_unlock: |
780 | rcu_read_unlock(); | |
781 | err: | |
782 | if (router) | |
783 | neigh_node_free_ref(router); | |
784 | return NULL; | |
c6c8fea2 SE |
785 | } |
786 | ||
787 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
788 | { | |
789 | struct ethhdr *ethhdr; | |
790 | ||
791 | /* drop packet if it has not necessary minimum size */ | |
792 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
793 | return -1; | |
794 | ||
795 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
796 | ||
797 | /* packet with unicast indication but broadcast recipient */ | |
798 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
799 | return -1; | |
800 | ||
801 | /* packet with broadcast sender address */ | |
802 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
803 | return -1; | |
804 | ||
805 | /* not for me */ | |
806 | if (!is_my_mac(ethhdr->h_dest)) | |
807 | return -1; | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
a7f6ee94 | 812 | static int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
813 | { |
814 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
815 | struct orig_node *orig_node = NULL; |
816 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
817 | struct unicast_packet *unicast_packet; |
818 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 819 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
820 | struct sk_buff *new_skb; |
821 | ||
822 | unicast_packet = (struct unicast_packet *)skb->data; | |
823 | ||
824 | /* TTL exceeded */ | |
76543d14 | 825 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
826 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
827 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 828 | goto out; |
c6c8fea2 SE |
829 | } |
830 | ||
831 | /* get routing information */ | |
7aadf889 ML |
832 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
833 | ||
44524fcd | 834 | if (!orig_node) |
b5a6f69c | 835 | goto out; |
c6c8fea2 | 836 | |
a4c135c5 | 837 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 838 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 839 | |
d0072609 | 840 | if (!neigh_node) |
44524fcd | 841 | goto out; |
c6c8fea2 SE |
842 | |
843 | /* create a copy of the skb, if needed, to modify it. */ | |
844 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 845 | goto out; |
c6c8fea2 SE |
846 | |
847 | unicast_packet = (struct unicast_packet *)skb->data; | |
848 | ||
76543d14 | 849 | if (unicast_packet->header.packet_type == BAT_UNICAST && |
c6c8fea2 | 850 | atomic_read(&bat_priv->fragmentation) && |
d0072609 ML |
851 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
852 | ret = frag_send_skb(skb, bat_priv, | |
853 | neigh_node->if_incoming, neigh_node->addr); | |
854 | goto out; | |
855 | } | |
c6c8fea2 | 856 | |
76543d14 | 857 | if (unicast_packet->header.packet_type == BAT_UNICAST_FRAG && |
d0072609 | 858 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
859 | |
860 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
861 | ||
862 | if (ret == NET_RX_DROP) | |
44524fcd | 863 | goto out; |
c6c8fea2 SE |
864 | |
865 | /* packet was buffered for late merge */ | |
44524fcd ML |
866 | if (!new_skb) { |
867 | ret = NET_RX_SUCCESS; | |
868 | goto out; | |
869 | } | |
c6c8fea2 SE |
870 | |
871 | skb = new_skb; | |
872 | unicast_packet = (struct unicast_packet *)skb->data; | |
873 | } | |
874 | ||
875 | /* decrement ttl */ | |
76543d14 | 876 | unicast_packet->header.ttl--; |
c6c8fea2 SE |
877 | |
878 | /* route it */ | |
d0072609 | 879 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 880 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 881 | |
44524fcd ML |
882 | out: |
883 | if (neigh_node) | |
884 | neigh_node_free_ref(neigh_node); | |
885 | if (orig_node) | |
7b36e8ee | 886 | orig_node_free_ref(orig_node); |
44524fcd | 887 | return ret; |
c6c8fea2 SE |
888 | } |
889 | ||
a73105b8 AQ |
890 | static int check_unicast_ttvn(struct bat_priv *bat_priv, |
891 | struct sk_buff *skb) { | |
892 | uint8_t curr_ttvn; | |
893 | struct orig_node *orig_node; | |
894 | struct ethhdr *ethhdr; | |
895 | struct hard_iface *primary_if; | |
896 | struct unicast_packet *unicast_packet; | |
cc47f66e | 897 | bool tt_poss_change; |
a73105b8 AQ |
898 | |
899 | /* I could need to modify it */ | |
900 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) | |
901 | return 0; | |
902 | ||
903 | unicast_packet = (struct unicast_packet *)skb->data; | |
904 | ||
cc47f66e AQ |
905 | if (is_my_mac(unicast_packet->dest)) { |
906 | tt_poss_change = bat_priv->tt_poss_change; | |
a73105b8 | 907 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
cc47f66e | 908 | } else { |
a73105b8 AQ |
909 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
910 | ||
911 | if (!orig_node) | |
912 | return 0; | |
913 | ||
914 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 915 | tt_poss_change = orig_node->tt_poss_change; |
a73105b8 AQ |
916 | orig_node_free_ref(orig_node); |
917 | } | |
918 | ||
919 | /* Check whether I have to reroute the packet */ | |
cc47f66e | 920 | if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { |
a73105b8 AQ |
921 | /* Linearize the skb before accessing it */ |
922 | if (skb_linearize(skb) < 0) | |
923 | return 0; | |
924 | ||
925 | ethhdr = (struct ethhdr *)(skb->data + | |
926 | sizeof(struct unicast_packet)); | |
3d393e47 | 927 | orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest); |
a73105b8 AQ |
928 | |
929 | if (!orig_node) { | |
930 | if (!is_my_client(bat_priv, ethhdr->h_dest)) | |
931 | return 0; | |
932 | primary_if = primary_if_get_selected(bat_priv); | |
933 | if (!primary_if) | |
934 | return 0; | |
935 | memcpy(unicast_packet->dest, | |
936 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
937 | hardif_free_ref(primary_if); | |
938 | } else { | |
939 | memcpy(unicast_packet->dest, orig_node->orig, | |
940 | ETH_ALEN); | |
941 | curr_ttvn = (uint8_t) | |
942 | atomic_read(&orig_node->last_ttvn); | |
943 | orig_node_free_ref(orig_node); | |
944 | } | |
945 | ||
86ceb360 SE |
946 | bat_dbg(DBG_ROUTES, bat_priv, |
947 | "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n", | |
948 | unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest, | |
949 | unicast_packet->dest); | |
a73105b8 AQ |
950 | |
951 | unicast_packet->ttvn = curr_ttvn; | |
952 | } | |
953 | return 1; | |
954 | } | |
955 | ||
e6c10f43 | 956 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 | 957 | { |
a73105b8 | 958 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
c6c8fea2 | 959 | struct unicast_packet *unicast_packet; |
704509b8 | 960 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
961 | |
962 | if (check_unicast_packet(skb, hdr_size) < 0) | |
963 | return NET_RX_DROP; | |
964 | ||
a73105b8 AQ |
965 | if (!check_unicast_ttvn(bat_priv, skb)) |
966 | return NET_RX_DROP; | |
967 | ||
c6c8fea2 SE |
968 | unicast_packet = (struct unicast_packet *)skb->data; |
969 | ||
970 | /* packet for me */ | |
971 | if (is_my_mac(unicast_packet->dest)) { | |
972 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
973 | return NET_RX_SUCCESS; | |
974 | } | |
975 | ||
7cefb149 | 976 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
977 | } |
978 | ||
e6c10f43 | 979 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
980 | { |
981 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
982 | struct unicast_frag_packet *unicast_packet; | |
704509b8 | 983 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
984 | struct sk_buff *new_skb = NULL; |
985 | int ret; | |
986 | ||
987 | if (check_unicast_packet(skb, hdr_size) < 0) | |
988 | return NET_RX_DROP; | |
989 | ||
a73105b8 AQ |
990 | if (!check_unicast_ttvn(bat_priv, skb)) |
991 | return NET_RX_DROP; | |
992 | ||
c6c8fea2 SE |
993 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
994 | ||
995 | /* packet for me */ | |
996 | if (is_my_mac(unicast_packet->dest)) { | |
997 | ||
998 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
999 | ||
1000 | if (ret == NET_RX_DROP) | |
1001 | return NET_RX_DROP; | |
1002 | ||
1003 | /* packet was buffered for late merge */ | |
1004 | if (!new_skb) | |
1005 | return NET_RX_SUCCESS; | |
1006 | ||
1007 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
1008 | sizeof(struct unicast_packet)); | |
1009 | return NET_RX_SUCCESS; | |
1010 | } | |
1011 | ||
7cefb149 | 1012 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1013 | } |
1014 | ||
1015 | ||
e6c10f43 | 1016 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1017 | { |
1018 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1019 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1020 | struct bcast_packet *bcast_packet; |
1021 | struct ethhdr *ethhdr; | |
704509b8 | 1022 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1023 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1024 | int32_t seq_diff; |
1025 | ||
1026 | /* drop packet if it has not necessary minimum size */ | |
1027 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1028 | goto out; |
c6c8fea2 SE |
1029 | |
1030 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1031 | ||
1032 | /* packet with broadcast indication but unicast recipient */ | |
1033 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1034 | goto out; |
c6c8fea2 SE |
1035 | |
1036 | /* packet with broadcast sender address */ | |
1037 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1038 | goto out; |
c6c8fea2 SE |
1039 | |
1040 | /* ignore broadcasts sent by myself */ | |
1041 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1042 | goto out; |
c6c8fea2 SE |
1043 | |
1044 | bcast_packet = (struct bcast_packet *)skb->data; | |
1045 | ||
1046 | /* ignore broadcasts originated by myself */ | |
1047 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1048 | goto out; |
c6c8fea2 | 1049 | |
76543d14 | 1050 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1051 | goto out; |
c6c8fea2 | 1052 | |
7aadf889 | 1053 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1054 | |
1055 | if (!orig_node) | |
b5a6f69c | 1056 | goto out; |
c6c8fea2 | 1057 | |
f3e0008f | 1058 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1059 | |
1060 | /* check whether the packet is a duplicate */ | |
0079d2ce SE |
1061 | if (bat_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1062 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1063 | goto spin_unlock; |
c6c8fea2 SE |
1064 | |
1065 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1066 | ||
1067 | /* check whether the packet is old and the host just restarted. */ | |
1068 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1069 | &orig_node->bcast_seqno_reset)) |
1070 | goto spin_unlock; | |
c6c8fea2 SE |
1071 | |
1072 | /* mark broadcast in flood history, update window position | |
1073 | * if required. */ | |
1074 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1075 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1076 | ||
f3e0008f | 1077 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1078 | |
c6c8fea2 | 1079 | /* rebroadcast packet */ |
8698529d | 1080 | add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1081 | |
23721387 SW |
1082 | /* don't hand the broadcast up if it is from an originator |
1083 | * from the same backbone. | |
1084 | */ | |
1085 | if (bla_is_backbone_gw(skb, orig_node, hdr_size)) | |
1086 | goto out; | |
1087 | ||
c6c8fea2 SE |
1088 | /* broadcast for me */ |
1089 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1090 | ret = NET_RX_SUCCESS; |
1091 | goto out; | |
c6c8fea2 | 1092 | |
f3e0008f ML |
1093 | spin_unlock: |
1094 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1095 | out: |
1096 | if (orig_node) | |
7b36e8ee | 1097 | orig_node_free_ref(orig_node); |
f3e0008f | 1098 | return ret; |
c6c8fea2 SE |
1099 | } |
1100 | ||
e6c10f43 | 1101 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1102 | { |
1103 | struct vis_packet *vis_packet; | |
1104 | struct ethhdr *ethhdr; | |
1105 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
704509b8 | 1106 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1107 | |
1108 | /* keep skb linear */ | |
1109 | if (skb_linearize(skb) < 0) | |
1110 | return NET_RX_DROP; | |
1111 | ||
1112 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1113 | return NET_RX_DROP; | |
1114 | ||
1115 | vis_packet = (struct vis_packet *)skb->data; | |
1116 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1117 | ||
1118 | /* not for me */ | |
1119 | if (!is_my_mac(ethhdr->h_dest)) | |
1120 | return NET_RX_DROP; | |
1121 | ||
1122 | /* ignore own packets */ | |
1123 | if (is_my_mac(vis_packet->vis_orig)) | |
1124 | return NET_RX_DROP; | |
1125 | ||
1126 | if (is_my_mac(vis_packet->sender_orig)) | |
1127 | return NET_RX_DROP; | |
1128 | ||
1129 | switch (vis_packet->vis_type) { | |
1130 | case VIS_TYPE_SERVER_SYNC: | |
1131 | receive_server_sync_packet(bat_priv, vis_packet, | |
1132 | skb_headlen(skb)); | |
1133 | break; | |
1134 | ||
1135 | case VIS_TYPE_CLIENT_UPDATE: | |
1136 | receive_client_update_packet(bat_priv, vis_packet, | |
1137 | skb_headlen(skb)); | |
1138 | break; | |
1139 | ||
1140 | default: /* ignore unknown packet */ | |
1141 | break; | |
1142 | } | |
1143 | ||
1144 | /* We take a copy of the data in the packet, so we should | |
1145 | always free the skbuf. */ | |
1146 | return NET_RX_DROP; | |
1147 | } |