Commit | Line | Data |
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c6c8fea2 | 1 | /* |
64afe353 | 2 | * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
18 | * 02110-1301, USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "main.h" | |
23 | #include "routing.h" | |
24 | #include "send.h" | |
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" |
fc957275 | 32 | #include "bat_ogm.h" |
c6c8fea2 | 33 | |
e6c10f43 | 34 | void slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 35 | { |
e6c10f43 | 36 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 37 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 38 | struct hlist_node *node; |
c6c8fea2 | 39 | struct hlist_head *head; |
c6c8fea2 SE |
40 | struct orig_node *orig_node; |
41 | unsigned long *word; | |
42 | int i; | |
43 | size_t word_index; | |
44 | ||
c6c8fea2 SE |
45 | for (i = 0; i < hash->size; i++) { |
46 | head = &hash->table[i]; | |
47 | ||
fb778ea1 | 48 | rcu_read_lock(); |
7aadf889 | 49 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 50 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
e6c10f43 | 51 | word_index = hard_iface->if_num * NUM_WORDS; |
c6c8fea2 SE |
52 | word = &(orig_node->bcast_own[word_index]); |
53 | ||
54 | bit_get_packet(bat_priv, word, 1, 0); | |
e6c10f43 | 55 | orig_node->bcast_own_sum[hard_iface->if_num] = |
c6c8fea2 | 56 | bit_packet_count(word); |
2ae2daf6 | 57 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 58 | } |
fb778ea1 | 59 | rcu_read_unlock(); |
c6c8fea2 | 60 | } |
c6c8fea2 SE |
61 | } |
62 | ||
fc957275 ML |
63 | static void _update_route(struct bat_priv *bat_priv, |
64 | struct orig_node *orig_node, | |
65 | struct neigh_node *neigh_node) | |
c6c8fea2 | 66 | { |
e1a5382f LL |
67 | struct neigh_node *curr_router; |
68 | ||
69 | curr_router = orig_node_get_router(orig_node); | |
a8e7f4bc | 70 | |
c6c8fea2 | 71 | /* route deleted */ |
e1a5382f | 72 | if ((curr_router) && (!neigh_node)) { |
c6c8fea2 SE |
73 | bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
74 | orig_node->orig); | |
2dafb49d | 75 | tt_global_del_orig(bat_priv, orig_node, |
a73105b8 | 76 | "Deleted route towards originator"); |
c6c8fea2 | 77 | |
e1a5382f LL |
78 | /* route added */ |
79 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 SE |
80 | |
81 | bat_dbg(DBG_ROUTES, bat_priv, | |
82 | "Adding route towards: %pM (via %pM)\n", | |
83 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 84 | /* route changed */ |
bb899b89 | 85 | } else if (neigh_node && curr_router) { |
c6c8fea2 SE |
86 | bat_dbg(DBG_ROUTES, bat_priv, |
87 | "Changing route towards: %pM " | |
88 | "(now via %pM - was via %pM)\n", | |
89 | orig_node->orig, neigh_node->addr, | |
e1a5382f | 90 | curr_router->addr); |
c6c8fea2 SE |
91 | } |
92 | ||
e1a5382f LL |
93 | if (curr_router) |
94 | neigh_node_free_ref(curr_router); | |
95 | ||
96 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
97 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
98 | neigh_node = NULL; | |
e1a5382f LL |
99 | |
100 | spin_lock_bh(&orig_node->neigh_list_lock); | |
101 | rcu_assign_pointer(orig_node->router, neigh_node); | |
102 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
103 | ||
104 | /* decrease refcount of previous best neighbor */ | |
105 | if (curr_router) | |
106 | neigh_node_free_ref(curr_router); | |
c6c8fea2 SE |
107 | } |
108 | ||
fc957275 ML |
109 | void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
110 | struct neigh_node *neigh_node) | |
c6c8fea2 | 111 | { |
e1a5382f | 112 | struct neigh_node *router = NULL; |
c6c8fea2 SE |
113 | |
114 | if (!orig_node) | |
e1a5382f LL |
115 | goto out; |
116 | ||
117 | router = orig_node_get_router(orig_node); | |
c6c8fea2 | 118 | |
e1a5382f | 119 | if (router != neigh_node) |
fc957275 | 120 | _update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
121 | |
122 | out: | |
123 | if (router) | |
124 | neigh_node_free_ref(router); | |
c6c8fea2 SE |
125 | } |
126 | ||
a4c135c5 SW |
127 | /* caller must hold the neigh_list_lock */ |
128 | void bonding_candidate_del(struct orig_node *orig_node, | |
129 | struct neigh_node *neigh_node) | |
130 | { | |
131 | /* this neighbor is not part of our candidate list */ | |
132 | if (list_empty(&neigh_node->bonding_list)) | |
133 | goto out; | |
134 | ||
135 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 136 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
44524fcd | 137 | neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
138 | atomic_dec(&orig_node->bond_candidates); |
139 | ||
140 | out: | |
141 | return; | |
142 | } | |
143 | ||
fc957275 ML |
144 | void bonding_candidate_add(struct orig_node *orig_node, |
145 | struct neigh_node *neigh_node) | |
a4c135c5 SW |
146 | { |
147 | struct hlist_node *node; | |
e1a5382f LL |
148 | struct neigh_node *tmp_neigh_node, *router = NULL; |
149 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
150 | |
151 | spin_lock_bh(&orig_node->neigh_list_lock); | |
152 | ||
153 | /* only consider if it has the same primary address ... */ | |
39901e71 ML |
154 | if (!compare_eth(orig_node->orig, |
155 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
156 | goto candidate_del; |
157 | ||
e1a5382f LL |
158 | router = orig_node_get_router(orig_node); |
159 | if (!router) | |
a4c135c5 SW |
160 | goto candidate_del; |
161 | ||
a4c135c5 | 162 | /* ... and is good enough to be considered */ |
e1a5382f | 163 | if (neigh_node->tq_avg < router->tq_avg - BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
164 | goto candidate_del; |
165 | ||
166 | /** | |
167 | * check if we have another candidate with the same mac address or | |
168 | * interface. If we do, we won't select this candidate because of | |
169 | * possible interference. | |
170 | */ | |
171 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
172 | &orig_node->neigh_list, list) { | |
173 | ||
174 | if (tmp_neigh_node == neigh_node) | |
175 | continue; | |
176 | ||
177 | /* we only care if the other candidate is even | |
178 | * considered as candidate. */ | |
179 | if (list_empty(&tmp_neigh_node->bonding_list)) | |
180 | continue; | |
181 | ||
182 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
39901e71 | 183 | (compare_eth(neigh_node->addr, tmp_neigh_node->addr))) { |
a4c135c5 SW |
184 | interference_candidate = 1; |
185 | break; | |
186 | } | |
187 | } | |
188 | ||
189 | /* don't care further if it is an interference candidate */ | |
190 | if (interference_candidate) | |
191 | goto candidate_del; | |
192 | ||
193 | /* this neighbor already is part of our candidate list */ | |
194 | if (!list_empty(&neigh_node->bonding_list)) | |
195 | goto out; | |
196 | ||
44524fcd ML |
197 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
198 | goto out; | |
199 | ||
a4c135c5 | 200 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
201 | atomic_inc(&orig_node->bond_candidates); |
202 | goto out; | |
203 | ||
204 | candidate_del: | |
205 | bonding_candidate_del(orig_node, neigh_node); | |
206 | ||
207 | out: | |
208 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
209 | |
210 | if (router) | |
211 | neigh_node_free_ref(router); | |
a4c135c5 SW |
212 | } |
213 | ||
214 | /* copy primary address for bonding */ | |
fc957275 ML |
215 | void bonding_save_primary(const struct orig_node *orig_node, |
216 | struct orig_node *orig_neigh_node, | |
217 | const struct batman_ogm_packet *batman_ogm_packet) | |
a4c135c5 | 218 | { |
b6da4bf5 | 219 | if (!(batman_ogm_packet->flags & PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
220 | return; |
221 | ||
222 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
223 | } | |
224 | ||
c6c8fea2 SE |
225 | /* checks whether the host restarted and is in the protection time. |
226 | * returns: | |
227 | * 0 if the packet is to be accepted | |
228 | * 1 if the packet is to be ignored. | |
229 | */ | |
fc957275 ML |
230 | int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
231 | unsigned long *last_reset) | |
c6c8fea2 SE |
232 | { |
233 | if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) | |
234 | || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { | |
235 | if (time_after(jiffies, *last_reset + | |
236 | msecs_to_jiffies(RESET_PROTECTION_MS))) { | |
237 | ||
238 | *last_reset = jiffies; | |
239 | bat_dbg(DBG_BATMAN, bat_priv, | |
240 | "old packet received, start protection\n"); | |
241 | ||
242 | return 0; | |
243 | } else | |
244 | return 1; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
fc957275 | 249 | int recv_bat_ogm_packet(struct sk_buff *skb, struct hard_iface *hard_iface) |
c6c8fea2 | 250 | { |
c6c8fea2 SE |
251 | struct ethhdr *ethhdr; |
252 | ||
253 | /* drop packet if it has not necessary minimum size */ | |
b6da4bf5 | 254 | if (unlikely(!pskb_may_pull(skb, BATMAN_OGM_LEN))) |
c6c8fea2 SE |
255 | return NET_RX_DROP; |
256 | ||
257 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
258 | ||
259 | /* packet with broadcast indication but unicast recipient */ | |
260 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
261 | return NET_RX_DROP; | |
262 | ||
263 | /* packet with broadcast sender address */ | |
264 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
265 | return NET_RX_DROP; | |
266 | ||
267 | /* create a copy of the skb, if needed, to modify it. */ | |
268 | if (skb_cow(skb, 0) < 0) | |
269 | return NET_RX_DROP; | |
270 | ||
271 | /* keep skb linear */ | |
272 | if (skb_linearize(skb) < 0) | |
273 | return NET_RX_DROP; | |
274 | ||
275 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
276 | ||
fc957275 | 277 | bat_ogm_receive(ethhdr, skb->data, skb_headlen(skb), hard_iface); |
c6c8fea2 SE |
278 | |
279 | kfree_skb(skb); | |
280 | return NET_RX_SUCCESS; | |
281 | } | |
282 | ||
283 | static int recv_my_icmp_packet(struct bat_priv *bat_priv, | |
284 | struct sk_buff *skb, size_t icmp_len) | |
285 | { | |
32ae9b22 | 286 | struct hard_iface *primary_if = NULL; |
44524fcd | 287 | struct orig_node *orig_node = NULL; |
e1a5382f | 288 | struct neigh_node *router = NULL; |
c6c8fea2 | 289 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 290 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
291 | |
292 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
293 | |
294 | /* add data to device queue */ | |
295 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
296 | bat_socket_receive_packet(icmp_packet, icmp_len); | |
44524fcd | 297 | goto out; |
c6c8fea2 SE |
298 | } |
299 | ||
32ae9b22 ML |
300 | primary_if = primary_if_get_selected(bat_priv); |
301 | if (!primary_if) | |
44524fcd | 302 | goto out; |
c6c8fea2 SE |
303 | |
304 | /* answer echo request (ping) */ | |
305 | /* get routing information */ | |
7aadf889 | 306 | orig_node = orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 307 | if (!orig_node) |
e1a5382f | 308 | goto out; |
c6c8fea2 | 309 | |
e1a5382f LL |
310 | router = orig_node_get_router(orig_node); |
311 | if (!router) | |
312 | goto out; | |
c6c8fea2 | 313 | |
44524fcd ML |
314 | /* create a copy of the skb, if needed, to modify it. */ |
315 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
316 | goto out; | |
317 | ||
318 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
319 | ||
320 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 321 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
44524fcd ML |
322 | icmp_packet->msg_type = ECHO_REPLY; |
323 | icmp_packet->ttl = TTL; | |
324 | ||
e1a5382f | 325 | send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 326 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 327 | |
44524fcd | 328 | out: |
32ae9b22 ML |
329 | if (primary_if) |
330 | hardif_free_ref(primary_if); | |
e1a5382f LL |
331 | if (router) |
332 | neigh_node_free_ref(router); | |
44524fcd | 333 | if (orig_node) |
7b36e8ee | 334 | orig_node_free_ref(orig_node); |
c6c8fea2 SE |
335 | return ret; |
336 | } | |
337 | ||
338 | static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, | |
74ef1153 | 339 | struct sk_buff *skb) |
c6c8fea2 | 340 | { |
32ae9b22 | 341 | struct hard_iface *primary_if = NULL; |
44524fcd | 342 | struct orig_node *orig_node = NULL; |
e1a5382f | 343 | struct neigh_node *router = NULL; |
c6c8fea2 | 344 | struct icmp_packet *icmp_packet; |
44524fcd | 345 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
346 | |
347 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
348 | |
349 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
350 | if (icmp_packet->msg_type != ECHO_REQUEST) { | |
351 | pr_debug("Warning - can't forward icmp packet from %pM to " | |
352 | "%pM: ttl exceeded\n", icmp_packet->orig, | |
353 | 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 ML |
378 | icmp_packet->msg_type = TTL_EXCEEDED; |
379 | icmp_packet->ttl = TTL; | |
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]), | |
435 | ethhdr->h_dest, ETH_ALEN); | |
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 */ | |
444 | if (icmp_packet->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 ML |
462 | /* decrement ttl */ |
463 | icmp_packet->ttl--; | |
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; | |
581 | struct ethhdr *ethhdr; | |
582 | ||
583 | /* drop packet if it has not necessary minimum size */ | |
584 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) | |
585 | goto out; | |
586 | ||
587 | /* I could need to modify it */ | |
588 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) | |
589 | goto out; | |
590 | ||
591 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
592 | ||
593 | /* packet with unicast indication but broadcast recipient */ | |
594 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
595 | goto out; | |
596 | ||
597 | /* packet with broadcast sender address */ | |
598 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
599 | goto out; | |
600 | ||
601 | tt_query = (struct tt_query_packet *)skb->data; | |
602 | ||
603 | tt_query->tt_data = ntohs(tt_query->tt_data); | |
604 | ||
605 | switch (tt_query->flags & TT_QUERY_TYPE_MASK) { | |
606 | case TT_REQUEST: | |
607 | /* If we cannot provide an answer the tt_request is | |
608 | * forwarded */ | |
609 | if (!send_tt_response(bat_priv, tt_query)) { | |
610 | bat_dbg(DBG_TT, bat_priv, | |
611 | "Routing TT_REQUEST to %pM [%c]\n", | |
612 | tt_query->dst, | |
613 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
614 | tt_query->tt_data = htons(tt_query->tt_data); | |
615 | return route_unicast_packet(skb, recv_if); | |
616 | } | |
617 | break; | |
618 | case TT_RESPONSE: | |
015758d0 | 619 | /* packet needs to be linearized to access the TT changes */ |
a73105b8 AQ |
620 | if (skb_linearize(skb) < 0) |
621 | goto out; | |
622 | ||
623 | if (is_my_mac(tt_query->dst)) | |
624 | handle_tt_response(bat_priv, tt_query); | |
625 | else { | |
626 | bat_dbg(DBG_TT, bat_priv, | |
627 | "Routing TT_RESPONSE to %pM [%c]\n", | |
628 | tt_query->dst, | |
629 | (tt_query->flags & TT_FULL_TABLE ? 'F' : '.')); | |
630 | tt_query->tt_data = htons(tt_query->tt_data); | |
631 | return route_unicast_packet(skb, recv_if); | |
632 | } | |
633 | break; | |
634 | } | |
635 | ||
636 | out: | |
637 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
638 | return NET_RX_DROP; | |
639 | } | |
640 | ||
cc47f66e AQ |
641 | int recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
642 | { | |
643 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
644 | struct roam_adv_packet *roam_adv_packet; | |
645 | struct orig_node *orig_node; | |
646 | struct ethhdr *ethhdr; | |
647 | ||
648 | /* drop packet if it has not necessary minimum size */ | |
649 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) | |
650 | goto out; | |
651 | ||
652 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
653 | ||
654 | /* packet with unicast indication but broadcast recipient */ | |
655 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
656 | goto out; | |
657 | ||
658 | /* packet with broadcast sender address */ | |
659 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
660 | goto out; | |
661 | ||
662 | roam_adv_packet = (struct roam_adv_packet *)skb->data; | |
663 | ||
664 | if (!is_my_mac(roam_adv_packet->dst)) | |
665 | return route_unicast_packet(skb, recv_if); | |
666 | ||
667 | orig_node = orig_hash_find(bat_priv, roam_adv_packet->src); | |
668 | if (!orig_node) | |
669 | goto out; | |
670 | ||
671 | bat_dbg(DBG_TT, bat_priv, "Received ROAMING_ADV from %pM " | |
672 | "(client %pM)\n", roam_adv_packet->src, | |
673 | roam_adv_packet->client); | |
674 | ||
675 | tt_global_add(bat_priv, orig_node, roam_adv_packet->client, | |
bc279080 | 676 | atomic_read(&orig_node->last_ttvn) + 1, true, false); |
cc47f66e AQ |
677 | |
678 | /* Roaming phase starts: I have new information but the ttvn has not | |
679 | * been incremented yet. This flag will make me check all the incoming | |
680 | * packets for the correct destination. */ | |
681 | bat_priv->tt_poss_change = true; | |
682 | ||
683 | orig_node_free_ref(orig_node); | |
684 | out: | |
685 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
686 | return NET_RX_DROP; | |
687 | } | |
688 | ||
c6c8fea2 | 689 | /* find a suitable router for this originator, and use |
a4c135c5 SW |
690 | * bonding if possible. increases the found neighbors |
691 | * refcount.*/ | |
c6c8fea2 SE |
692 | struct neigh_node *find_router(struct bat_priv *bat_priv, |
693 | struct orig_node *orig_node, | |
747e4221 | 694 | const struct hard_iface *recv_if) |
c6c8fea2 SE |
695 | { |
696 | struct orig_node *primary_orig_node; | |
697 | struct orig_node *router_orig; | |
55158629 | 698 | struct neigh_node *router; |
c6c8fea2 SE |
699 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
700 | int bonding_enabled; | |
701 | ||
702 | if (!orig_node) | |
703 | return NULL; | |
704 | ||
e1a5382f LL |
705 | router = orig_node_get_router(orig_node); |
706 | if (!router) | |
01df2b65 | 707 | goto err; |
c6c8fea2 SE |
708 | |
709 | /* without bonding, the first node should | |
710 | * always choose the default router. */ | |
c6c8fea2 SE |
711 | bonding_enabled = atomic_read(&bat_priv->bonding); |
712 | ||
a4c135c5 SW |
713 | rcu_read_lock(); |
714 | /* select default router to output */ | |
e1a5382f | 715 | router_orig = router->orig_node; |
01df2b65 ML |
716 | if (!router_orig) |
717 | goto err_unlock; | |
a4c135c5 | 718 | |
a4c135c5 SW |
719 | if ((!recv_if) && (!bonding_enabled)) |
720 | goto return_router; | |
c6c8fea2 SE |
721 | |
722 | /* if we have something in the primary_addr, we can search | |
723 | * for a potential bonding candidate. */ | |
39901e71 | 724 | if (compare_eth(router_orig->primary_addr, zero_mac)) |
a4c135c5 | 725 | goto return_router; |
c6c8fea2 SE |
726 | |
727 | /* find the orig_node which has the primary interface. might | |
728 | * even be the same as our router_orig in many cases */ | |
729 | ||
39901e71 | 730 | if (compare_eth(router_orig->primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
731 | primary_orig_node = router_orig; |
732 | } else { | |
7aadf889 ML |
733 | primary_orig_node = orig_hash_find(bat_priv, |
734 | router_orig->primary_addr); | |
c6c8fea2 | 735 | if (!primary_orig_node) |
a4c135c5 | 736 | goto return_router; |
7aadf889 | 737 | |
7b36e8ee | 738 | orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
739 | } |
740 | ||
741 | /* with less than 2 candidates, we can't do any | |
742 | * bonding and prefer the original router. */ | |
a4c135c5 SW |
743 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
744 | goto return_router; | |
c6c8fea2 | 745 | |
c6c8fea2 SE |
746 | /* all nodes between should choose a candidate which |
747 | * is is not on the interface where the packet came | |
748 | * in. */ | |
a4c135c5 | 749 | |
44524fcd | 750 | neigh_node_free_ref(router); |
c6c8fea2 | 751 | |
55158629 LL |
752 | if (bonding_enabled) |
753 | router = find_bond_router(primary_orig_node, recv_if); | |
754 | else | |
755 | router = find_ifalter_router(primary_orig_node, recv_if); | |
c6c8fea2 | 756 | |
a4c135c5 | 757 | return_router: |
e2cbc11c AQ |
758 | if (router && router->if_incoming->if_status != IF_ACTIVE) |
759 | goto err_unlock; | |
760 | ||
a4c135c5 | 761 | rcu_read_unlock(); |
c6c8fea2 | 762 | return router; |
01df2b65 ML |
763 | err_unlock: |
764 | rcu_read_unlock(); | |
765 | err: | |
766 | if (router) | |
767 | neigh_node_free_ref(router); | |
768 | return NULL; | |
c6c8fea2 SE |
769 | } |
770 | ||
771 | static int check_unicast_packet(struct sk_buff *skb, int hdr_size) | |
772 | { | |
773 | struct ethhdr *ethhdr; | |
774 | ||
775 | /* drop packet if it has not necessary minimum size */ | |
776 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
777 | return -1; | |
778 | ||
779 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
780 | ||
781 | /* packet with unicast indication but broadcast recipient */ | |
782 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
783 | return -1; | |
784 | ||
785 | /* packet with broadcast sender address */ | |
786 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
787 | return -1; | |
788 | ||
789 | /* not for me */ | |
790 | if (!is_my_mac(ethhdr->h_dest)) | |
791 | return -1; | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
7cefb149 | 796 | int route_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
797 | { |
798 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
799 | struct orig_node *orig_node = NULL; |
800 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
801 | struct unicast_packet *unicast_packet; |
802 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 803 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
804 | struct sk_buff *new_skb; |
805 | ||
806 | unicast_packet = (struct unicast_packet *)skb->data; | |
807 | ||
808 | /* TTL exceeded */ | |
809 | if (unicast_packet->ttl < 2) { | |
810 | pr_debug("Warning - can't forward unicast packet from %pM to " | |
811 | "%pM: ttl exceeded\n", ethhdr->h_source, | |
812 | unicast_packet->dest); | |
44524fcd | 813 | goto out; |
c6c8fea2 SE |
814 | } |
815 | ||
816 | /* get routing information */ | |
7aadf889 ML |
817 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
818 | ||
44524fcd | 819 | if (!orig_node) |
b5a6f69c | 820 | goto out; |
c6c8fea2 | 821 | |
a4c135c5 | 822 | /* find_router() increases neigh_nodes refcount if found. */ |
44524fcd | 823 | neigh_node = find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 824 | |
d0072609 | 825 | if (!neigh_node) |
44524fcd | 826 | goto out; |
c6c8fea2 SE |
827 | |
828 | /* create a copy of the skb, if needed, to modify it. */ | |
829 | if (skb_cow(skb, sizeof(struct ethhdr)) < 0) | |
44524fcd | 830 | goto out; |
c6c8fea2 SE |
831 | |
832 | unicast_packet = (struct unicast_packet *)skb->data; | |
833 | ||
834 | if (unicast_packet->packet_type == BAT_UNICAST && | |
835 | atomic_read(&bat_priv->fragmentation) && | |
d0072609 ML |
836 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
837 | ret = frag_send_skb(skb, bat_priv, | |
838 | neigh_node->if_incoming, neigh_node->addr); | |
839 | goto out; | |
840 | } | |
c6c8fea2 SE |
841 | |
842 | if (unicast_packet->packet_type == BAT_UNICAST_FRAG && | |
d0072609 | 843 | frag_can_reassemble(skb, neigh_node->if_incoming->net_dev->mtu)) { |
c6c8fea2 SE |
844 | |
845 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
846 | ||
847 | if (ret == NET_RX_DROP) | |
44524fcd | 848 | goto out; |
c6c8fea2 SE |
849 | |
850 | /* packet was buffered for late merge */ | |
44524fcd ML |
851 | if (!new_skb) { |
852 | ret = NET_RX_SUCCESS; | |
853 | goto out; | |
854 | } | |
c6c8fea2 SE |
855 | |
856 | skb = new_skb; | |
857 | unicast_packet = (struct unicast_packet *)skb->data; | |
858 | } | |
859 | ||
860 | /* decrement ttl */ | |
861 | unicast_packet->ttl--; | |
862 | ||
863 | /* route it */ | |
d0072609 | 864 | send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 865 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 866 | |
44524fcd ML |
867 | out: |
868 | if (neigh_node) | |
869 | neigh_node_free_ref(neigh_node); | |
870 | if (orig_node) | |
7b36e8ee | 871 | orig_node_free_ref(orig_node); |
44524fcd | 872 | return ret; |
c6c8fea2 SE |
873 | } |
874 | ||
a73105b8 AQ |
875 | static int check_unicast_ttvn(struct bat_priv *bat_priv, |
876 | struct sk_buff *skb) { | |
877 | uint8_t curr_ttvn; | |
878 | struct orig_node *orig_node; | |
879 | struct ethhdr *ethhdr; | |
880 | struct hard_iface *primary_if; | |
881 | struct unicast_packet *unicast_packet; | |
cc47f66e | 882 | bool tt_poss_change; |
a73105b8 AQ |
883 | |
884 | /* I could need to modify it */ | |
885 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) | |
886 | return 0; | |
887 | ||
888 | unicast_packet = (struct unicast_packet *)skb->data; | |
889 | ||
cc47f66e AQ |
890 | if (is_my_mac(unicast_packet->dest)) { |
891 | tt_poss_change = bat_priv->tt_poss_change; | |
a73105b8 | 892 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
cc47f66e | 893 | } else { |
a73105b8 AQ |
894 | orig_node = orig_hash_find(bat_priv, unicast_packet->dest); |
895 | ||
896 | if (!orig_node) | |
897 | return 0; | |
898 | ||
899 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 900 | tt_poss_change = orig_node->tt_poss_change; |
a73105b8 AQ |
901 | orig_node_free_ref(orig_node); |
902 | } | |
903 | ||
904 | /* Check whether I have to reroute the packet */ | |
cc47f66e | 905 | if (seq_before(unicast_packet->ttvn, curr_ttvn) || tt_poss_change) { |
a73105b8 AQ |
906 | /* Linearize the skb before accessing it */ |
907 | if (skb_linearize(skb) < 0) | |
908 | return 0; | |
909 | ||
910 | ethhdr = (struct ethhdr *)(skb->data + | |
911 | sizeof(struct unicast_packet)); | |
3d393e47 | 912 | orig_node = transtable_search(bat_priv, NULL, ethhdr->h_dest); |
a73105b8 AQ |
913 | |
914 | if (!orig_node) { | |
915 | if (!is_my_client(bat_priv, ethhdr->h_dest)) | |
916 | return 0; | |
917 | primary_if = primary_if_get_selected(bat_priv); | |
918 | if (!primary_if) | |
919 | return 0; | |
920 | memcpy(unicast_packet->dest, | |
921 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
922 | hardif_free_ref(primary_if); | |
923 | } else { | |
924 | memcpy(unicast_packet->dest, orig_node->orig, | |
925 | ETH_ALEN); | |
926 | curr_ttvn = (uint8_t) | |
927 | atomic_read(&orig_node->last_ttvn); | |
928 | orig_node_free_ref(orig_node); | |
929 | } | |
930 | ||
931 | bat_dbg(DBG_ROUTES, bat_priv, "TTVN mismatch (old_ttvn %u " | |
932 | "new_ttvn %u)! Rerouting unicast packet (for %pM) to " | |
933 | "%pM\n", unicast_packet->ttvn, curr_ttvn, | |
934 | ethhdr->h_dest, unicast_packet->dest); | |
935 | ||
936 | unicast_packet->ttvn = curr_ttvn; | |
937 | } | |
938 | return 1; | |
939 | } | |
940 | ||
e6c10f43 | 941 | int recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 | 942 | { |
a73105b8 | 943 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
c6c8fea2 | 944 | struct unicast_packet *unicast_packet; |
704509b8 | 945 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
946 | |
947 | if (check_unicast_packet(skb, hdr_size) < 0) | |
948 | return NET_RX_DROP; | |
949 | ||
a73105b8 AQ |
950 | if (!check_unicast_ttvn(bat_priv, skb)) |
951 | return NET_RX_DROP; | |
952 | ||
c6c8fea2 SE |
953 | unicast_packet = (struct unicast_packet *)skb->data; |
954 | ||
955 | /* packet for me */ | |
956 | if (is_my_mac(unicast_packet->dest)) { | |
957 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
958 | return NET_RX_SUCCESS; | |
959 | } | |
960 | ||
7cefb149 | 961 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
962 | } |
963 | ||
e6c10f43 | 964 | int recv_ucast_frag_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
965 | { |
966 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
967 | struct unicast_frag_packet *unicast_packet; | |
704509b8 | 968 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
969 | struct sk_buff *new_skb = NULL; |
970 | int ret; | |
971 | ||
972 | if (check_unicast_packet(skb, hdr_size) < 0) | |
973 | return NET_RX_DROP; | |
974 | ||
a73105b8 AQ |
975 | if (!check_unicast_ttvn(bat_priv, skb)) |
976 | return NET_RX_DROP; | |
977 | ||
c6c8fea2 SE |
978 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
979 | ||
980 | /* packet for me */ | |
981 | if (is_my_mac(unicast_packet->dest)) { | |
982 | ||
983 | ret = frag_reassemble_skb(skb, bat_priv, &new_skb); | |
984 | ||
985 | if (ret == NET_RX_DROP) | |
986 | return NET_RX_DROP; | |
987 | ||
988 | /* packet was buffered for late merge */ | |
989 | if (!new_skb) | |
990 | return NET_RX_SUCCESS; | |
991 | ||
992 | interface_rx(recv_if->soft_iface, new_skb, recv_if, | |
993 | sizeof(struct unicast_packet)); | |
994 | return NET_RX_SUCCESS; | |
995 | } | |
996 | ||
7cefb149 | 997 | return route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
998 | } |
999 | ||
1000 | ||
e6c10f43 | 1001 | int recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1002 | { |
1003 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1004 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1005 | struct bcast_packet *bcast_packet; |
1006 | struct ethhdr *ethhdr; | |
704509b8 | 1007 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1008 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1009 | int32_t seq_diff; |
1010 | ||
1011 | /* drop packet if it has not necessary minimum size */ | |
1012 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1013 | goto out; |
c6c8fea2 SE |
1014 | |
1015 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1016 | ||
1017 | /* packet with broadcast indication but unicast recipient */ | |
1018 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1019 | goto out; |
c6c8fea2 SE |
1020 | |
1021 | /* packet with broadcast sender address */ | |
1022 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1023 | goto out; |
c6c8fea2 SE |
1024 | |
1025 | /* ignore broadcasts sent by myself */ | |
1026 | if (is_my_mac(ethhdr->h_source)) | |
f3e0008f | 1027 | goto out; |
c6c8fea2 SE |
1028 | |
1029 | bcast_packet = (struct bcast_packet *)skb->data; | |
1030 | ||
1031 | /* ignore broadcasts originated by myself */ | |
1032 | if (is_my_mac(bcast_packet->orig)) | |
f3e0008f | 1033 | goto out; |
c6c8fea2 SE |
1034 | |
1035 | if (bcast_packet->ttl < 2) | |
f3e0008f | 1036 | goto out; |
c6c8fea2 | 1037 | |
7aadf889 | 1038 | orig_node = orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1039 | |
1040 | if (!orig_node) | |
b5a6f69c | 1041 | goto out; |
c6c8fea2 | 1042 | |
f3e0008f | 1043 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1044 | |
1045 | /* check whether the packet is a duplicate */ | |
f3e0008f ML |
1046 | if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1047 | ntohl(bcast_packet->seqno))) | |
1048 | goto spin_unlock; | |
c6c8fea2 SE |
1049 | |
1050 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1051 | ||
1052 | /* check whether the packet is old and the host just restarted. */ | |
1053 | if (window_protected(bat_priv, seq_diff, | |
f3e0008f ML |
1054 | &orig_node->bcast_seqno_reset)) |
1055 | goto spin_unlock; | |
c6c8fea2 SE |
1056 | |
1057 | /* mark broadcast in flood history, update window position | |
1058 | * if required. */ | |
1059 | if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) | |
1060 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); | |
1061 | ||
f3e0008f | 1062 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1063 | |
c6c8fea2 | 1064 | /* rebroadcast packet */ |
8698529d | 1065 | add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 SE |
1066 | |
1067 | /* broadcast for me */ | |
1068 | interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); | |
f3e0008f ML |
1069 | ret = NET_RX_SUCCESS; |
1070 | goto out; | |
c6c8fea2 | 1071 | |
f3e0008f ML |
1072 | spin_unlock: |
1073 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1074 | out: |
1075 | if (orig_node) | |
7b36e8ee | 1076 | orig_node_free_ref(orig_node); |
f3e0008f | 1077 | return ret; |
c6c8fea2 SE |
1078 | } |
1079 | ||
e6c10f43 | 1080 | int recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1081 | { |
1082 | struct vis_packet *vis_packet; | |
1083 | struct ethhdr *ethhdr; | |
1084 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
704509b8 | 1085 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1086 | |
1087 | /* keep skb linear */ | |
1088 | if (skb_linearize(skb) < 0) | |
1089 | return NET_RX_DROP; | |
1090 | ||
1091 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1092 | return NET_RX_DROP; | |
1093 | ||
1094 | vis_packet = (struct vis_packet *)skb->data; | |
1095 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1096 | ||
1097 | /* not for me */ | |
1098 | if (!is_my_mac(ethhdr->h_dest)) | |
1099 | return NET_RX_DROP; | |
1100 | ||
1101 | /* ignore own packets */ | |
1102 | if (is_my_mac(vis_packet->vis_orig)) | |
1103 | return NET_RX_DROP; | |
1104 | ||
1105 | if (is_my_mac(vis_packet->sender_orig)) | |
1106 | return NET_RX_DROP; | |
1107 | ||
1108 | switch (vis_packet->vis_type) { | |
1109 | case VIS_TYPE_SERVER_SYNC: | |
1110 | receive_server_sync_packet(bat_priv, vis_packet, | |
1111 | skb_headlen(skb)); | |
1112 | break; | |
1113 | ||
1114 | case VIS_TYPE_CLIENT_UPDATE: | |
1115 | receive_client_update_packet(bat_priv, vis_packet, | |
1116 | skb_headlen(skb)); | |
1117 | break; | |
1118 | ||
1119 | default: /* ignore unknown packet */ | |
1120 | break; | |
1121 | } | |
1122 | ||
1123 | /* We take a copy of the data in the packet, so we should | |
1124 | always free the skbuf. */ | |
1125 | return NET_RX_DROP; | |
1126 | } |