Commit | Line | Data |
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0b873931 | 1 | /* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
c6c8fea2 SE |
18 | */ |
19 | ||
20 | #include "main.h" | |
21 | #include "routing.h" | |
22 | #include "send.h" | |
c6c8fea2 SE |
23 | #include "soft-interface.h" |
24 | #include "hard-interface.h" | |
25 | #include "icmp_socket.h" | |
26 | #include "translation-table.h" | |
27 | #include "originator.h" | |
c6c8fea2 | 28 | #include "vis.h" |
c6c8fea2 | 29 | #include "unicast.h" |
23721387 | 30 | #include "bridge_loop_avoidance.h" |
c384ea3e | 31 | #include "distributed-arp-table.h" |
95332477 | 32 | #include "network-coding.h" |
c6c8fea2 | 33 | |
63b01037 | 34 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 35 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 36 | |
56303d34 | 37 | void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 38 | { |
56303d34 | 39 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 40 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 41 | struct hlist_head *head; |
56303d34 | 42 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 43 | unsigned long *word; |
c90681b8 | 44 | uint32_t i; |
c6c8fea2 | 45 | size_t word_index; |
42d0b044 | 46 | uint8_t *w; |
c6c8fea2 | 47 | |
c6c8fea2 SE |
48 | for (i = 0; i < hash->size; i++) { |
49 | head = &hash->table[i]; | |
50 | ||
fb778ea1 | 51 | rcu_read_lock(); |
b67bfe0d | 52 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
2ae2daf6 | 53 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
42d0b044 | 54 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
c6c8fea2 SE |
55 | word = &(orig_node->bcast_own[word_index]); |
56 | ||
0f5f9322 | 57 | batadv_bit_get_packet(bat_priv, word, 1, 0); |
42d0b044 SE |
58 | w = &orig_node->bcast_own_sum[hard_iface->if_num]; |
59 | *w = bitmap_weight(word, BATADV_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 | ||
56303d34 SE |
66 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
67 | struct batadv_orig_node *orig_node, | |
68 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 69 | { |
56303d34 | 70 | struct batadv_neigh_node *curr_router; |
e1a5382f | 71 | |
7d211efc | 72 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 73 | |
c6c8fea2 | 74 | /* route deleted */ |
e1a5382f | 75 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
76 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
77 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
78 | batadv_tt_global_del_orig(bat_priv, orig_node, |
79 | "Deleted route towards originator"); | |
c6c8fea2 | 80 | |
e1a5382f LL |
81 | /* route added */ |
82 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 83 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
84 | "Adding route towards: %pM (via %pM)\n", |
85 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 86 | /* route changed */ |
bb899b89 | 87 | } else if (neigh_node && curr_router) { |
39c75a51 | 88 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
89 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
90 | orig_node->orig, neigh_node->addr, | |
91 | curr_router->addr); | |
c6c8fea2 SE |
92 | } |
93 | ||
e1a5382f | 94 | if (curr_router) |
7d211efc | 95 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
96 | |
97 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
98 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
99 | neigh_node = NULL; | |
e1a5382f LL |
100 | |
101 | spin_lock_bh(&orig_node->neigh_list_lock); | |
102 | rcu_assign_pointer(orig_node->router, neigh_node); | |
103 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
104 | ||
105 | /* decrease refcount of previous best neighbor */ | |
106 | if (curr_router) | |
7d211efc | 107 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
108 | } |
109 | ||
56303d34 SE |
110 | void batadv_update_route(struct batadv_priv *bat_priv, |
111 | struct batadv_orig_node *orig_node, | |
112 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 113 | { |
56303d34 | 114 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
115 | |
116 | if (!orig_node) | |
e1a5382f LL |
117 | goto out; |
118 | ||
7d211efc | 119 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 120 | |
e1a5382f | 121 | if (router != neigh_node) |
63b01037 | 122 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
123 | |
124 | out: | |
125 | if (router) | |
7d211efc | 126 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
127 | } |
128 | ||
a4c135c5 | 129 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
130 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
131 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
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); |
7d211efc | 139 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
140 | atomic_dec(&orig_node->bond_candidates); |
141 | ||
142 | out: | |
143 | return; | |
144 | } | |
145 | ||
56303d34 SE |
146 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
147 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 148 | { |
56303d34 | 149 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 150 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
151 | |
152 | spin_lock_bh(&orig_node->neigh_list_lock); | |
153 | ||
154 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
155 | if (!batadv_compare_eth(orig_node->orig, |
156 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
157 | goto candidate_del; |
158 | ||
7d211efc | 159 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 160 | if (!router) |
a4c135c5 SW |
161 | goto candidate_del; |
162 | ||
a4c135c5 | 163 | /* ... and is good enough to be considered */ |
42d0b044 | 164 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
165 | goto candidate_del; |
166 | ||
9cfc7bd6 | 167 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
168 | * interface. If we do, we won't select this candidate because of |
169 | * possible interference. | |
170 | */ | |
b67bfe0d | 171 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 172 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
173 | if (tmp_neigh_node == neigh_node) |
174 | continue; | |
175 | ||
176 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
177 | * considered as candidate. |
178 | */ | |
a4c135c5 SW |
179 | if (list_empty(&tmp_neigh_node->bonding_list)) |
180 | continue; | |
181 | ||
182 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
183 | (batadv_compare_eth(neigh_node->addr, |
184 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
185 | interference_candidate = 1; |
186 | break; | |
187 | } | |
188 | } | |
189 | ||
190 | /* don't care further if it is an interference candidate */ | |
191 | if (interference_candidate) | |
192 | goto candidate_del; | |
193 | ||
194 | /* this neighbor already is part of our candidate list */ | |
195 | if (!list_empty(&neigh_node->bonding_list)) | |
196 | goto out; | |
197 | ||
44524fcd ML |
198 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
199 | goto out; | |
200 | ||
a4c135c5 | 201 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
202 | atomic_inc(&orig_node->bond_candidates); |
203 | goto out; | |
204 | ||
205 | candidate_del: | |
30d3c511 | 206 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
207 | |
208 | out: | |
209 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
210 | |
211 | if (router) | |
7d211efc | 212 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
213 | } |
214 | ||
215 | /* copy primary address for bonding */ | |
30d3c511 | 216 | void |
56303d34 SE |
217 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
218 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 219 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 220 | { |
acd34afa | 221 | if (!(batman_ogm_packet->flags & BATADV_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 | */ | |
56303d34 | 232 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 233 | unsigned long *last_reset) |
c6c8fea2 | 234 | { |
42d0b044 SE |
235 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
236 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
237 | if (!batadv_has_timed_out(*last_reset, | |
238 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 239 | return 1; |
8c7bf248 ML |
240 | |
241 | *last_reset = jiffies; | |
39c75a51 | 242 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 243 | "old packet received, start protection\n"); |
c6c8fea2 | 244 | } |
8c7bf248 | 245 | |
c6c8fea2 SE |
246 | return 0; |
247 | } | |
248 | ||
30d3c511 | 249 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 250 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 251 | int header_len) |
c6c8fea2 | 252 | { |
c6c8fea2 SE |
253 | struct ethhdr *ethhdr; |
254 | ||
255 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
256 | if (unlikely(!pskb_may_pull(skb, header_len))) |
257 | return false; | |
c6c8fea2 | 258 | |
7ed4be95 | 259 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
260 | |
261 | /* packet with broadcast indication but unicast recipient */ | |
262 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 263 | return false; |
c6c8fea2 SE |
264 | |
265 | /* packet with broadcast sender address */ | |
266 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 267 | return false; |
c6c8fea2 SE |
268 | |
269 | /* create a copy of the skb, if needed, to modify it. */ | |
270 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 271 | return false; |
c6c8fea2 SE |
272 | |
273 | /* keep skb linear */ | |
274 | if (skb_linearize(skb) < 0) | |
c3e29312 | 275 | return false; |
c6c8fea2 | 276 | |
c3e29312 | 277 | return true; |
c6c8fea2 SE |
278 | } |
279 | ||
56303d34 | 280 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 281 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 282 | { |
56303d34 SE |
283 | struct batadv_hard_iface *primary_if = NULL; |
284 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 285 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 286 | int ret = NET_RX_DROP; |
c6c8fea2 | 287 | |
96412690 | 288 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
289 | |
290 | /* add data to device queue */ | |
acd34afa | 291 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 292 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 293 | goto out; |
c6c8fea2 SE |
294 | } |
295 | ||
e5d89254 | 296 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 297 | if (!primary_if) |
44524fcd | 298 | goto out; |
c6c8fea2 SE |
299 | |
300 | /* answer echo request (ping) */ | |
301 | /* get routing information */ | |
da641193 | 302 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 303 | if (!orig_node) |
e1a5382f | 304 | goto out; |
c6c8fea2 | 305 | |
44524fcd | 306 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 307 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
308 | goto out; |
309 | ||
96412690 | 310 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
311 | |
312 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 313 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 314 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 315 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 316 | |
bb351ba0 MH |
317 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
318 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 319 | |
44524fcd | 320 | out: |
32ae9b22 | 321 | if (primary_if) |
e5d89254 | 322 | batadv_hardif_free_ref(primary_if); |
44524fcd | 323 | if (orig_node) |
7d211efc | 324 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
325 | return ret; |
326 | } | |
327 | ||
56303d34 | 328 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 329 | struct sk_buff *skb) |
c6c8fea2 | 330 | { |
56303d34 SE |
331 | struct batadv_hard_iface *primary_if = NULL; |
332 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 333 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 334 | int ret = NET_RX_DROP; |
c6c8fea2 | 335 | |
96412690 | 336 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
337 | |
338 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 339 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
340 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
341 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 342 | goto out; |
c6c8fea2 SE |
343 | } |
344 | ||
e5d89254 | 345 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 346 | if (!primary_if) |
44524fcd | 347 | goto out; |
c6c8fea2 SE |
348 | |
349 | /* get routing information */ | |
da641193 | 350 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 351 | if (!orig_node) |
e1a5382f | 352 | goto out; |
c6c8fea2 | 353 | |
44524fcd | 354 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 355 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 356 | goto out; |
c6c8fea2 | 357 | |
96412690 | 358 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 359 | |
44524fcd | 360 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 361 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 362 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 363 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 364 | |
bb351ba0 MH |
365 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
366 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 367 | |
44524fcd | 368 | out: |
32ae9b22 | 369 | if (primary_if) |
e5d89254 | 370 | batadv_hardif_free_ref(primary_if); |
44524fcd | 371 | if (orig_node) |
7d211efc | 372 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
373 | return ret; |
374 | } | |
375 | ||
376 | ||
56303d34 SE |
377 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
378 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 379 | { |
56303d34 | 380 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 381 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 382 | struct ethhdr *ethhdr; |
56303d34 | 383 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 384 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 385 | int ret = NET_RX_DROP; |
c6c8fea2 | 386 | |
9cfc7bd6 | 387 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
388 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
389 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
390 | |
391 | /* drop packet if it has not necessary minimum size */ | |
392 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 393 | goto out; |
c6c8fea2 | 394 | |
7ed4be95 | 395 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
396 | |
397 | /* packet with unicast indication but broadcast recipient */ | |
398 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 399 | goto out; |
c6c8fea2 SE |
400 | |
401 | /* packet with broadcast sender address */ | |
402 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 403 | goto out; |
c6c8fea2 SE |
404 | |
405 | /* not for me */ | |
fe8a93b9 | 406 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 407 | goto out; |
c6c8fea2 | 408 | |
96412690 | 409 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
410 | |
411 | /* add record route information if not full */ | |
96412690 | 412 | if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 413 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 414 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 415 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
416 | icmp_packet->rr_cur++; |
417 | } | |
418 | ||
419 | /* packet for me */ | |
fe8a93b9 | 420 | if (batadv_is_my_mac(bat_priv, icmp_packet->dst)) |
63b01037 | 421 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
422 | |
423 | /* TTL exceeded */ | |
76543d14 | 424 | if (icmp_packet->header.ttl < 2) |
63b01037 | 425 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 426 | |
c6c8fea2 | 427 | /* get routing information */ |
da641193 | 428 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 429 | if (!orig_node) |
e1a5382f | 430 | goto out; |
c6c8fea2 | 431 | |
44524fcd | 432 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 433 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 434 | goto out; |
c6c8fea2 | 435 | |
96412690 | 436 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 437 | |
44524fcd | 438 | /* decrement ttl */ |
76543d14 | 439 | icmp_packet->header.ttl--; |
44524fcd ML |
440 | |
441 | /* route it */ | |
bb351ba0 MH |
442 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) |
443 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 444 | |
44524fcd | 445 | out: |
44524fcd | 446 | if (orig_node) |
7d211efc | 447 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
448 | return ret; |
449 | } | |
450 | ||
55158629 LL |
451 | /* In the bonding case, send the packets in a round |
452 | * robin fashion over the remaining interfaces. | |
453 | * | |
454 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
455 | * returned router's refcount. |
456 | */ | |
56303d34 SE |
457 | static struct batadv_neigh_node * |
458 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
459 | const struct batadv_hard_iface *recv_if) | |
55158629 | 460 | { |
56303d34 SE |
461 | struct batadv_neigh_node *tmp_neigh_node; |
462 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
463 | |
464 | rcu_read_lock(); | |
465 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
466 | bonding_list) { | |
467 | if (!first_candidate) | |
468 | first_candidate = tmp_neigh_node; | |
469 | ||
470 | /* recv_if == NULL on the first node. */ | |
471 | if (tmp_neigh_node->if_incoming == recv_if) | |
472 | continue; | |
473 | ||
474 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
475 | continue; | |
476 | ||
477 | router = tmp_neigh_node; | |
478 | break; | |
479 | } | |
480 | ||
481 | /* use the first candidate if nothing was found. */ | |
482 | if (!router && first_candidate && | |
483 | atomic_inc_not_zero(&first_candidate->refcount)) | |
484 | router = first_candidate; | |
485 | ||
486 | if (!router) | |
487 | goto out; | |
488 | ||
489 | /* selected should point to the next element | |
9cfc7bd6 SE |
490 | * after the current router |
491 | */ | |
55158629 LL |
492 | spin_lock_bh(&primary_orig->neigh_list_lock); |
493 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
494 | * does not exist as rcu version |
495 | */ | |
55158629 LL |
496 | list_del_rcu(&primary_orig->bond_list); |
497 | list_add_rcu(&primary_orig->bond_list, | |
498 | &router->bonding_list); | |
499 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
500 | ||
501 | out: | |
502 | rcu_read_unlock(); | |
503 | return router; | |
504 | } | |
505 | ||
506 | /* Interface Alternating: Use the best of the | |
507 | * remaining candidates which are not using | |
508 | * this interface. | |
509 | * | |
9cfc7bd6 SE |
510 | * Increases the returned router's refcount |
511 | */ | |
56303d34 SE |
512 | static struct batadv_neigh_node * |
513 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
514 | const struct batadv_hard_iface *recv_if) | |
55158629 | 515 | { |
56303d34 SE |
516 | struct batadv_neigh_node *tmp_neigh_node; |
517 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
518 | |
519 | rcu_read_lock(); | |
520 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
521 | bonding_list) { | |
522 | if (!first_candidate) | |
523 | first_candidate = tmp_neigh_node; | |
524 | ||
525 | /* recv_if == NULL on the first node. */ | |
526 | if (tmp_neigh_node->if_incoming == recv_if) | |
527 | continue; | |
528 | ||
fe3f4cfe SE |
529 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
530 | continue; | |
531 | ||
55158629 LL |
532 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
533 | continue; | |
534 | ||
fe3f4cfe SE |
535 | /* decrement refcount of previously selected router */ |
536 | if (router) | |
537 | batadv_neigh_node_free_ref(router); | |
55158629 | 538 | |
fe3f4cfe SE |
539 | /* we found a better router (or at least one valid router) */ |
540 | router = tmp_neigh_node; | |
55158629 LL |
541 | } |
542 | ||
543 | /* use the first candidate if nothing was found. */ | |
544 | if (!router && first_candidate && | |
545 | atomic_inc_not_zero(&first_candidate->refcount)) | |
546 | router = first_candidate; | |
547 | ||
548 | rcu_read_unlock(); | |
549 | return router; | |
550 | } | |
551 | ||
f86ce0ad MH |
552 | /** |
553 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 554 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
555 | * @skb: packet to check |
556 | * @hdr_size: size of header to pull | |
557 | * | |
558 | * Check for short header and bad addresses in given packet. Returns negative | |
559 | * value when check fails and 0 otherwise. The negative value depends on the | |
560 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
561 | * and -EREMOTE for non-local (other host) destination. | |
562 | */ | |
fe8a93b9 AQ |
563 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
564 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
565 | { |
566 | struct ethhdr *ethhdr; | |
567 | ||
568 | /* drop packet if it has not necessary minimum size */ | |
569 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 570 | return -ENODATA; |
ff51fd70 | 571 | |
7ed4be95 | 572 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
573 | |
574 | /* packet with unicast indication but broadcast recipient */ | |
575 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 576 | return -EBADR; |
ff51fd70 MH |
577 | |
578 | /* packet with broadcast sender address */ | |
579 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 580 | return -EBADR; |
ff51fd70 MH |
581 | |
582 | /* not for me */ | |
fe8a93b9 | 583 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 584 | return -EREMOTE; |
ff51fd70 MH |
585 | |
586 | return 0; | |
587 | } | |
588 | ||
56303d34 | 589 | int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
a73105b8 | 590 | { |
56303d34 | 591 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 592 | struct batadv_tt_query_packet *tt_query; |
f25bd58a | 593 | uint16_t tt_size; |
74ee3634 | 594 | int hdr_size = sizeof(*tt_query); |
1eda58bf | 595 | char tt_flag; |
96412690 | 596 | size_t packet_size; |
a73105b8 | 597 | |
fe8a93b9 | 598 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
74ee3634 | 599 | return NET_RX_DROP; |
a73105b8 AQ |
600 | |
601 | /* I could need to modify it */ | |
96412690 | 602 | if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) |
a73105b8 AQ |
603 | goto out; |
604 | ||
96412690 | 605 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 606 | |
7e071c79 | 607 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 608 | case BATADV_TT_REQUEST: |
d69909d2 | 609 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 610 | |
a73105b8 | 611 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
612 | * forwarded |
613 | */ | |
08c36d3e | 614 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
615 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
616 | tt_flag = 'F'; | |
617 | else | |
618 | tt_flag = '.'; | |
619 | ||
39c75a51 | 620 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
621 | "Routing TT_REQUEST to %pM [%c]\n", |
622 | tt_query->dst, | |
623 | tt_flag); | |
63b01037 | 624 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
625 | } |
626 | break; | |
acd34afa | 627 | case BATADV_TT_RESPONSE: |
d69909d2 | 628 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 629 | |
fe8a93b9 | 630 | if (batadv_is_my_mac(bat_priv, tt_query->dst)) { |
dc58fe32 | 631 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
632 | * changes |
633 | */ | |
dc58fe32 AQ |
634 | if (skb_linearize(skb) < 0) |
635 | goto out; | |
d2b6cc8e | 636 | /* skb_linearize() possibly changed skb->data */ |
96412690 | 637 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 638 | |
08c36d3e | 639 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
640 | |
641 | /* Ensure we have all the claimed data */ | |
96412690 SE |
642 | packet_size = sizeof(struct batadv_tt_query_packet); |
643 | packet_size += tt_size; | |
644 | if (unlikely(skb_headlen(skb) < packet_size)) | |
8b7342d6 AQ |
645 | goto out; |
646 | ||
08c36d3e | 647 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 648 | } else { |
acd34afa SE |
649 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
650 | tt_flag = 'F'; | |
651 | else | |
652 | tt_flag = '.'; | |
39c75a51 | 653 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
654 | "Routing TT_RESPONSE to %pM [%c]\n", |
655 | tt_query->dst, | |
656 | tt_flag); | |
63b01037 | 657 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
658 | } |
659 | break; | |
660 | } | |
661 | ||
662 | out: | |
663 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
664 | return NET_RX_DROP; | |
665 | } | |
666 | ||
56303d34 | 667 | int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
cc47f66e | 668 | { |
56303d34 | 669 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 670 | struct batadv_roam_adv_packet *roam_adv_packet; |
56303d34 | 671 | struct batadv_orig_node *orig_node; |
cc47f66e | 672 | |
fe8a93b9 AQ |
673 | if (batadv_check_unicast_packet(bat_priv, skb, |
674 | sizeof(*roam_adv_packet)) < 0) | |
cc47f66e AQ |
675 | goto out; |
676 | ||
d69909d2 | 677 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 678 | |
96412690 | 679 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; |
cc47f66e | 680 | |
fe8a93b9 | 681 | if (!batadv_is_my_mac(bat_priv, roam_adv_packet->dst)) |
63b01037 | 682 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 683 | |
20ff9d59 SW |
684 | /* check if it is a backbone gateway. we don't accept |
685 | * roaming advertisement from it, as it has the same | |
686 | * entries as we have. | |
687 | */ | |
08adf151 | 688 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
689 | goto out; |
690 | ||
da641193 | 691 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
692 | if (!orig_node) |
693 | goto out; | |
694 | ||
39c75a51 | 695 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
696 | "Received ROAMING_ADV from %pM (client %pM)\n", |
697 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 698 | |
08c36d3e | 699 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 700 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 701 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e | 702 | |
7d211efc | 703 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
704 | out: |
705 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
706 | return NET_RX_DROP; | |
707 | } | |
708 | ||
c6c8fea2 | 709 | /* find a suitable router for this originator, and use |
a4c135c5 | 710 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
711 | * refcount. |
712 | */ | |
56303d34 SE |
713 | struct batadv_neigh_node * |
714 | batadv_find_router(struct batadv_priv *bat_priv, | |
715 | struct batadv_orig_node *orig_node, | |
716 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 717 | { |
56303d34 SE |
718 | struct batadv_orig_node *primary_orig_node; |
719 | struct batadv_orig_node *router_orig; | |
720 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
721 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
722 | int bonding_enabled; | |
da641193 | 723 | uint8_t *primary_addr; |
c6c8fea2 SE |
724 | |
725 | if (!orig_node) | |
726 | return NULL; | |
727 | ||
7d211efc | 728 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 729 | if (!router) |
01df2b65 | 730 | goto err; |
c6c8fea2 SE |
731 | |
732 | /* without bonding, the first node should | |
9cfc7bd6 SE |
733 | * always choose the default router. |
734 | */ | |
c6c8fea2 SE |
735 | bonding_enabled = atomic_read(&bat_priv->bonding); |
736 | ||
a4c135c5 SW |
737 | rcu_read_lock(); |
738 | /* select default router to output */ | |
e1a5382f | 739 | router_orig = router->orig_node; |
01df2b65 ML |
740 | if (!router_orig) |
741 | goto err_unlock; | |
a4c135c5 | 742 | |
a4c135c5 SW |
743 | if ((!recv_if) && (!bonding_enabled)) |
744 | goto return_router; | |
c6c8fea2 | 745 | |
da641193 SE |
746 | primary_addr = router_orig->primary_addr; |
747 | ||
c6c8fea2 | 748 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
749 | * for a potential bonding candidate. |
750 | */ | |
1eda58bf | 751 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 752 | goto return_router; |
c6c8fea2 SE |
753 | |
754 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
755 | * even be the same as our router_orig in many cases |
756 | */ | |
1eda58bf | 757 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
758 | primary_orig_node = router_orig; |
759 | } else { | |
da641193 SE |
760 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
761 | primary_addr); | |
c6c8fea2 | 762 | if (!primary_orig_node) |
a4c135c5 | 763 | goto return_router; |
7aadf889 | 764 | |
7d211efc | 765 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
766 | } |
767 | ||
768 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
769 | * bonding and prefer the original router. |
770 | */ | |
a4c135c5 SW |
771 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
772 | goto return_router; | |
c6c8fea2 | 773 | |
c6c8fea2 SE |
774 | /* all nodes between should choose a candidate which |
775 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
776 | * in. |
777 | */ | |
7d211efc | 778 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 779 | |
55158629 | 780 | if (bonding_enabled) |
63b01037 | 781 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 782 | else |
63b01037 | 783 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 784 | |
a4c135c5 | 785 | return_router: |
e9a4f295 | 786 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
787 | goto err_unlock; |
788 | ||
a4c135c5 | 789 | rcu_read_unlock(); |
c6c8fea2 | 790 | return router; |
01df2b65 ML |
791 | err_unlock: |
792 | rcu_read_unlock(); | |
793 | err: | |
794 | if (router) | |
7d211efc | 795 | batadv_neigh_node_free_ref(router); |
01df2b65 | 796 | return NULL; |
c6c8fea2 SE |
797 | } |
798 | ||
63b01037 | 799 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 800 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 801 | { |
56303d34 SE |
802 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
803 | struct batadv_orig_node *orig_node = NULL; | |
804 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 805 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 806 | struct ethhdr *ethhdr = eth_hdr(skb); |
44524fcd | 807 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
808 | struct sk_buff *new_skb; |
809 | ||
96412690 | 810 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
811 | |
812 | /* TTL exceeded */ | |
76543d14 | 813 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
814 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
815 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 816 | goto out; |
c6c8fea2 SE |
817 | } |
818 | ||
819 | /* get routing information */ | |
da641193 | 820 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 821 | |
44524fcd | 822 | if (!orig_node) |
b5a6f69c | 823 | goto out; |
c6c8fea2 | 824 | |
a4c135c5 | 825 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 826 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 827 | |
d0072609 | 828 | if (!neigh_node) |
44524fcd | 829 | goto out; |
c6c8fea2 SE |
830 | |
831 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 832 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 833 | goto out; |
c6c8fea2 | 834 | |
96412690 | 835 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 836 | |
acd34afa | 837 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 838 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 839 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
840 | ret = batadv_frag_send_skb(skb, bat_priv, |
841 | neigh_node->if_incoming, | |
842 | neigh_node->addr); | |
d0072609 ML |
843 | goto out; |
844 | } | |
c6c8fea2 | 845 | |
acd34afa | 846 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
847 | batadv_frag_can_reassemble(skb, |
848 | neigh_node->if_incoming->net_dev->mtu)) { | |
88ed1e77 | 849 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
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; | |
96412690 | 861 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
862 | } |
863 | ||
864 | /* decrement ttl */ | |
76543d14 | 865 | unicast_packet->header.ttl--; |
c6c8fea2 | 866 | |
95332477 MH |
867 | /* network code packet if possible */ |
868 | if (batadv_nc_skb_forward(skb, neigh_node, ethhdr)) { | |
bb351ba0 | 869 | ret = NET_RX_SUCCESS; |
95332477 MH |
870 | } else if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) { |
871 | ret = NET_RX_SUCCESS; | |
872 | ||
873 | /* Update stats counter */ | |
874 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
875 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
876 | skb->len + ETH_HLEN); | |
877 | } | |
c6c8fea2 | 878 | |
44524fcd ML |
879 | out: |
880 | if (neigh_node) | |
7d211efc | 881 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 882 | if (orig_node) |
7d211efc | 883 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 884 | return ret; |
c6c8fea2 SE |
885 | } |
886 | ||
7c1fd91d AQ |
887 | /** |
888 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
889 | * @bat_priv: the bat priv with all the soft interface information | |
890 | * @unicast_packet: the unicast header to be updated | |
891 | * @dst_addr: the payload destination | |
892 | * | |
893 | * Search the translation table for dst_addr and update the unicast header with | |
894 | * the new corresponding information (originator address where the destination | |
895 | * client currently is and its known TTVN) | |
896 | * | |
897 | * Returns true if the packet header has been updated, false otherwise | |
898 | */ | |
899 | static bool | |
900 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
901 | struct batadv_unicast_packet *unicast_packet, | |
902 | uint8_t *dst_addr) | |
903 | { | |
904 | struct batadv_orig_node *orig_node = NULL; | |
905 | struct batadv_hard_iface *primary_if = NULL; | |
906 | bool ret = false; | |
907 | uint8_t *orig_addr, orig_ttvn; | |
908 | ||
909 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
910 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
911 | if (!primary_if) | |
912 | goto out; | |
913 | orig_addr = primary_if->net_dev->dev_addr; | |
914 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
915 | } else { | |
916 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
917 | if (!orig_node) | |
918 | goto out; | |
919 | ||
920 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
921 | goto out; | |
922 | ||
923 | orig_addr = orig_node->orig; | |
924 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
925 | } | |
926 | ||
927 | /* update the packet header */ | |
928 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
929 | unicast_packet->ttvn = orig_ttvn; | |
930 | ||
931 | ret = true; | |
932 | out: | |
933 | if (primary_if) | |
934 | batadv_hardif_free_ref(primary_if); | |
935 | if (orig_node) | |
936 | batadv_orig_node_free_ref(orig_node); | |
937 | ||
938 | return ret; | |
939 | } | |
940 | ||
56303d34 | 941 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 942 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 943 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 944 | struct batadv_orig_node *orig_node; |
a73105b8 | 945 | struct ethhdr *ethhdr; |
56303d34 | 946 | struct batadv_hard_iface *primary_if; |
96412690 | 947 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 948 | int is_old_ttvn; |
a73105b8 | 949 | |
b8fcfa42 | 950 | /* check if there is enough data before accessing it */ |
dd981ab0 | 951 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
952 | return 0; |
953 | ||
954 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
955 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
956 | return 0; |
957 | ||
96412690 | 958 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 959 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 960 | |
7c1fd91d AQ |
961 | /* check if the destination client was served by this node and it is now |
962 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
963 | * message and that it knows the new destination in the mesh to re-route | |
964 | * the packet to | |
965 | */ | |
966 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
967 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
968 | ethhdr->h_dest)) | |
969 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
970 | bat_priv, | |
971 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
972 | unicast_packet->dest, | |
973 | ethhdr->h_dest); | |
974 | /* at this point the mesh destination should have been | |
975 | * substituted with the originator address found in the global | |
976 | * table. If not, let the packet go untouched anyway because | |
977 | * there is nothing the node can do | |
978 | */ | |
979 | return 1; | |
980 | } | |
981 | ||
982 | /* retrieve the TTVN known by this node for the packet destination. This | |
983 | * value is used later to check if the node which sent (or re-routed | |
984 | * last time) the packet had an updated information or not | |
985 | */ | |
986 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 987 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
988 | orig_node = batadv_orig_hash_find(bat_priv, |
989 | unicast_packet->dest); | |
7c1fd91d AQ |
990 | /* if it is not possible to find the orig_node representing the |
991 | * destination, the packet can immediately be dropped as it will | |
992 | * not be possible to deliver it | |
993 | */ | |
a73105b8 AQ |
994 | if (!orig_node) |
995 | return 0; | |
996 | ||
997 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 998 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
999 | } |
1000 | ||
7c1fd91d AQ |
1001 | /* check if the TTVN contained in the packet is fresher than what the |
1002 | * node knows | |
1003 | */ | |
3e34819e | 1004 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
1005 | if (!is_old_ttvn) |
1006 | return 1; | |
a73105b8 | 1007 | |
7c1fd91d AQ |
1008 | old_ttvn = unicast_packet->ttvn; |
1009 | /* the packet was forged based on outdated network information. Its | |
1010 | * destination can possibly be updated and forwarded towards the new | |
1011 | * target host | |
1012 | */ | |
1013 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
1014 | ethhdr->h_dest)) { | |
1015 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
1016 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
1017 | unicast_packet->dest, ethhdr->h_dest, | |
1018 | old_ttvn, curr_ttvn); | |
1019 | return 1; | |
1020 | } | |
3275e7cc | 1021 | |
7c1fd91d AQ |
1022 | /* the packet has not been re-routed: either the destination is |
1023 | * currently served by this node or there is no destination at all and | |
1024 | * it is possible to drop the packet | |
1025 | */ | |
1026 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
1027 | return 0; | |
3275e7cc | 1028 | |
7c1fd91d AQ |
1029 | /* update the header in order to let the packet be delivered to this |
1030 | * node's soft interface | |
1031 | */ | |
1032 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1033 | if (!primary_if) | |
1034 | return 0; | |
a73105b8 | 1035 | |
7c1fd91d AQ |
1036 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
1037 | ||
1038 | batadv_hardif_free_ref(primary_if); | |
1039 | ||
1040 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 1041 | |
a73105b8 AQ |
1042 | return 1; |
1043 | } | |
1044 | ||
56303d34 SE |
1045 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
1046 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1047 | { |
56303d34 | 1048 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1049 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 1050 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
1051 | uint8_t *orig_addr; |
1052 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 1053 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 1054 | bool is4addr; |
c6c8fea2 | 1055 | |
7cdcf6dd | 1056 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 1057 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 1058 | |
c384ea3e | 1059 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 1060 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 1061 | if (is4addr) |
4046b24a | 1062 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 1063 | |
612d2b4f | 1064 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 1065 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
1066 | |
1067 | /* Even though the packet is not for us, we might save it to use for | |
1068 | * decoding a later received coded packet | |
1069 | */ | |
1070 | if (check == -EREMOTE) | |
1071 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
1072 | ||
1073 | if (check < 0) | |
c6c8fea2 | 1074 | return NET_RX_DROP; |
dd981ab0 | 1075 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
1076 | return NET_RX_DROP; |
1077 | ||
c6c8fea2 | 1078 | /* packet for me */ |
fe8a93b9 | 1079 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 1080 | if (is4addr) { |
4046b24a MH |
1081 | batadv_dat_inc_counter(bat_priv, |
1082 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
1083 | orig_addr = unicast_4addr_packet->src; |
1084 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
1085 | } | |
4046b24a | 1086 | |
c384ea3e AQ |
1087 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1088 | hdr_size)) | |
1089 | goto rx_success; | |
1090 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1091 | hdr_size)) | |
1092 | goto rx_success; | |
1093 | ||
37135173 | 1094 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 1095 | orig_node); |
37135173 | 1096 | |
c384ea3e | 1097 | rx_success: |
9affec6b AQ |
1098 | if (orig_node) |
1099 | batadv_orig_node_free_ref(orig_node); | |
1100 | ||
c6c8fea2 SE |
1101 | return NET_RX_SUCCESS; |
1102 | } | |
1103 | ||
63b01037 | 1104 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1105 | } |
1106 | ||
30d3c511 | 1107 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1108 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1109 | { |
56303d34 | 1110 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1111 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1112 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1113 | struct sk_buff *new_skb = NULL; |
1114 | int ret; | |
1115 | ||
fe8a93b9 | 1116 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
c6c8fea2 SE |
1117 | return NET_RX_DROP; |
1118 | ||
dd981ab0 | 1119 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
1120 | return NET_RX_DROP; |
1121 | ||
96412690 | 1122 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1123 | |
1124 | /* packet for me */ | |
fe8a93b9 | 1125 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
88ed1e77 | 1126 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1127 | |
1128 | if (ret == NET_RX_DROP) | |
1129 | return NET_RX_DROP; | |
1130 | ||
1131 | /* packet was buffered for late merge */ | |
1132 | if (!new_skb) | |
1133 | return NET_RX_SUCCESS; | |
1134 | ||
c384ea3e AQ |
1135 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb, |
1136 | hdr_size)) | |
1137 | goto rx_success; | |
1138 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb, | |
1139 | hdr_size)) | |
1140 | goto rx_success; | |
1141 | ||
04b482a2 | 1142 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
37135173 | 1143 | sizeof(struct batadv_unicast_packet), NULL); |
c384ea3e AQ |
1144 | |
1145 | rx_success: | |
c6c8fea2 SE |
1146 | return NET_RX_SUCCESS; |
1147 | } | |
1148 | ||
63b01037 | 1149 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1150 | } |
1151 | ||
1152 | ||
56303d34 SE |
1153 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1154 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1155 | { |
56303d34 SE |
1156 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1157 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1158 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1159 | struct ethhdr *ethhdr; |
704509b8 | 1160 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1161 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1162 | int32_t seq_diff; |
1163 | ||
1164 | /* drop packet if it has not necessary minimum size */ | |
1165 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1166 | goto out; |
c6c8fea2 | 1167 | |
7ed4be95 | 1168 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1169 | |
1170 | /* packet with broadcast indication but unicast recipient */ | |
1171 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1172 | goto out; |
c6c8fea2 SE |
1173 | |
1174 | /* packet with broadcast sender address */ | |
1175 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1176 | goto out; |
c6c8fea2 SE |
1177 | |
1178 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1179 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1180 | goto out; |
c6c8fea2 | 1181 | |
96412690 | 1182 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1183 | |
1184 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1185 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1186 | goto out; |
c6c8fea2 | 1187 | |
76543d14 | 1188 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1189 | goto out; |
c6c8fea2 | 1190 | |
da641193 | 1191 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1192 | |
1193 | if (!orig_node) | |
b5a6f69c | 1194 | goto out; |
c6c8fea2 | 1195 | |
f3e0008f | 1196 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1197 | |
1198 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1199 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1200 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1201 | goto spin_unlock; |
c6c8fea2 SE |
1202 | |
1203 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1204 | ||
1205 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1206 | if (batadv_window_protected(bat_priv, seq_diff, |
1207 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1208 | goto spin_unlock; |
c6c8fea2 SE |
1209 | |
1210 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1211 | * if required. |
1212 | */ | |
0f5f9322 | 1213 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1214 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1215 | ||
f3e0008f | 1216 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1217 | |
fe2da6ff | 1218 | /* check whether this has been sent by another originator before */ |
004e86fc | 1219 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1220 | goto out; |
1221 | ||
c6c8fea2 | 1222 | /* rebroadcast packet */ |
9455e34c | 1223 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1224 | |
23721387 SW |
1225 | /* don't hand the broadcast up if it is from an originator |
1226 | * from the same backbone. | |
1227 | */ | |
08adf151 | 1228 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1229 | goto out; |
1230 | ||
c384ea3e AQ |
1231 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1232 | goto rx_success; | |
1233 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1234 | goto rx_success; | |
1235 | ||
c6c8fea2 | 1236 | /* broadcast for me */ |
37135173 AQ |
1237 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1238 | orig_node); | |
c384ea3e AQ |
1239 | |
1240 | rx_success: | |
f3e0008f ML |
1241 | ret = NET_RX_SUCCESS; |
1242 | goto out; | |
c6c8fea2 | 1243 | |
f3e0008f ML |
1244 | spin_unlock: |
1245 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1246 | out: |
1247 | if (orig_node) | |
7d211efc | 1248 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1249 | return ret; |
c6c8fea2 SE |
1250 | } |
1251 | ||
56303d34 SE |
1252 | int batadv_recv_vis_packet(struct sk_buff *skb, |
1253 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1254 | { |
96412690 | 1255 | struct batadv_vis_packet *vis_packet; |
c6c8fea2 | 1256 | struct ethhdr *ethhdr; |
56303d34 | 1257 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704509b8 | 1258 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1259 | |
1260 | /* keep skb linear */ | |
1261 | if (skb_linearize(skb) < 0) | |
1262 | return NET_RX_DROP; | |
1263 | ||
1264 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1265 | return NET_RX_DROP; | |
1266 | ||
96412690 | 1267 | vis_packet = (struct batadv_vis_packet *)skb->data; |
7ed4be95 | 1268 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1269 | |
1270 | /* not for me */ | |
fe8a93b9 | 1271 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
c6c8fea2 SE |
1272 | return NET_RX_DROP; |
1273 | ||
1274 | /* ignore own packets */ | |
fe8a93b9 | 1275 | if (batadv_is_my_mac(bat_priv, vis_packet->vis_orig)) |
c6c8fea2 SE |
1276 | return NET_RX_DROP; |
1277 | ||
fe8a93b9 | 1278 | if (batadv_is_my_mac(bat_priv, vis_packet->sender_orig)) |
c6c8fea2 SE |
1279 | return NET_RX_DROP; |
1280 | ||
1281 | switch (vis_packet->vis_type) { | |
acd34afa | 1282 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1283 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1284 | skb_headlen(skb)); | |
c6c8fea2 SE |
1285 | break; |
1286 | ||
acd34afa | 1287 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1288 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1289 | skb_headlen(skb)); | |
c6c8fea2 SE |
1290 | break; |
1291 | ||
1292 | default: /* ignore unknown packet */ | |
1293 | break; | |
1294 | } | |
1295 | ||
1296 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1297 | * always free the skbuf. |
1298 | */ | |
c6c8fea2 SE |
1299 | return NET_RX_DROP; |
1300 | } |