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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 SE |
37 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
38 | struct batadv_orig_node *orig_node, | |
39 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 40 | { |
56303d34 | 41 | struct batadv_neigh_node *curr_router; |
e1a5382f | 42 | |
7d211efc | 43 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 44 | |
c6c8fea2 | 45 | /* route deleted */ |
e1a5382f | 46 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
47 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
48 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
49 | batadv_tt_global_del_orig(bat_priv, orig_node, |
50 | "Deleted route towards originator"); | |
c6c8fea2 | 51 | |
e1a5382f LL |
52 | /* route added */ |
53 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 54 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
55 | "Adding route towards: %pM (via %pM)\n", |
56 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 57 | /* route changed */ |
bb899b89 | 58 | } else if (neigh_node && curr_router) { |
39c75a51 | 59 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
60 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
61 | orig_node->orig, neigh_node->addr, | |
62 | curr_router->addr); | |
c6c8fea2 SE |
63 | } |
64 | ||
e1a5382f | 65 | if (curr_router) |
7d211efc | 66 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
67 | |
68 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
69 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
70 | neigh_node = NULL; | |
e1a5382f LL |
71 | |
72 | spin_lock_bh(&orig_node->neigh_list_lock); | |
73 | rcu_assign_pointer(orig_node->router, neigh_node); | |
74 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
75 | ||
76 | /* decrease refcount of previous best neighbor */ | |
77 | if (curr_router) | |
7d211efc | 78 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
79 | } |
80 | ||
56303d34 SE |
81 | void batadv_update_route(struct batadv_priv *bat_priv, |
82 | struct batadv_orig_node *orig_node, | |
83 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 84 | { |
56303d34 | 85 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
86 | |
87 | if (!orig_node) | |
e1a5382f LL |
88 | goto out; |
89 | ||
7d211efc | 90 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 91 | |
e1a5382f | 92 | if (router != neigh_node) |
63b01037 | 93 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
94 | |
95 | out: | |
96 | if (router) | |
7d211efc | 97 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
98 | } |
99 | ||
a4c135c5 | 100 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
101 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
102 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
103 | { |
104 | /* this neighbor is not part of our candidate list */ | |
105 | if (list_empty(&neigh_node->bonding_list)) | |
106 | goto out; | |
107 | ||
108 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 109 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 110 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
111 | atomic_dec(&orig_node->bond_candidates); |
112 | ||
113 | out: | |
114 | return; | |
115 | } | |
116 | ||
56303d34 SE |
117 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
118 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 119 | { |
56303d34 | 120 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 121 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
122 | |
123 | spin_lock_bh(&orig_node->neigh_list_lock); | |
124 | ||
125 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
126 | if (!batadv_compare_eth(orig_node->orig, |
127 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
128 | goto candidate_del; |
129 | ||
7d211efc | 130 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 131 | if (!router) |
a4c135c5 SW |
132 | goto candidate_del; |
133 | ||
a4c135c5 | 134 | /* ... and is good enough to be considered */ |
42d0b044 | 135 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
136 | goto candidate_del; |
137 | ||
9cfc7bd6 | 138 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
139 | * interface. If we do, we won't select this candidate because of |
140 | * possible interference. | |
141 | */ | |
b67bfe0d | 142 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 143 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
144 | if (tmp_neigh_node == neigh_node) |
145 | continue; | |
146 | ||
147 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
148 | * considered as candidate. |
149 | */ | |
a4c135c5 SW |
150 | if (list_empty(&tmp_neigh_node->bonding_list)) |
151 | continue; | |
152 | ||
153 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
154 | (batadv_compare_eth(neigh_node->addr, |
155 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
156 | interference_candidate = 1; |
157 | break; | |
158 | } | |
159 | } | |
160 | ||
161 | /* don't care further if it is an interference candidate */ | |
162 | if (interference_candidate) | |
163 | goto candidate_del; | |
164 | ||
165 | /* this neighbor already is part of our candidate list */ | |
166 | if (!list_empty(&neigh_node->bonding_list)) | |
167 | goto out; | |
168 | ||
44524fcd ML |
169 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
170 | goto out; | |
171 | ||
a4c135c5 | 172 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
173 | atomic_inc(&orig_node->bond_candidates); |
174 | goto out; | |
175 | ||
176 | candidate_del: | |
30d3c511 | 177 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
178 | |
179 | out: | |
180 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
181 | |
182 | if (router) | |
7d211efc | 183 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
184 | } |
185 | ||
186 | /* copy primary address for bonding */ | |
30d3c511 | 187 | void |
56303d34 SE |
188 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
189 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 190 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 191 | { |
acd34afa | 192 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
193 | return; |
194 | ||
195 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
196 | } | |
197 | ||
c6c8fea2 SE |
198 | /* checks whether the host restarted and is in the protection time. |
199 | * returns: | |
200 | * 0 if the packet is to be accepted | |
201 | * 1 if the packet is to be ignored. | |
202 | */ | |
56303d34 | 203 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 204 | unsigned long *last_reset) |
c6c8fea2 | 205 | { |
42d0b044 SE |
206 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
207 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
208 | if (!batadv_has_timed_out(*last_reset, | |
209 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 210 | return 1; |
8c7bf248 ML |
211 | |
212 | *last_reset = jiffies; | |
39c75a51 | 213 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 214 | "old packet received, start protection\n"); |
c6c8fea2 | 215 | } |
8c7bf248 | 216 | |
c6c8fea2 SE |
217 | return 0; |
218 | } | |
219 | ||
30d3c511 | 220 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 221 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 222 | int header_len) |
c6c8fea2 | 223 | { |
c6c8fea2 SE |
224 | struct ethhdr *ethhdr; |
225 | ||
226 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
227 | if (unlikely(!pskb_may_pull(skb, header_len))) |
228 | return false; | |
c6c8fea2 | 229 | |
7ed4be95 | 230 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
231 | |
232 | /* packet with broadcast indication but unicast recipient */ | |
233 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 234 | return false; |
c6c8fea2 SE |
235 | |
236 | /* packet with broadcast sender address */ | |
237 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 238 | return false; |
c6c8fea2 SE |
239 | |
240 | /* create a copy of the skb, if needed, to modify it. */ | |
241 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 242 | return false; |
c6c8fea2 SE |
243 | |
244 | /* keep skb linear */ | |
245 | if (skb_linearize(skb) < 0) | |
c3e29312 | 246 | return false; |
c6c8fea2 | 247 | |
c3e29312 | 248 | return true; |
c6c8fea2 SE |
249 | } |
250 | ||
56303d34 | 251 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 252 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 253 | { |
56303d34 SE |
254 | struct batadv_hard_iface *primary_if = NULL; |
255 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 256 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 257 | int ret = NET_RX_DROP; |
c6c8fea2 | 258 | |
96412690 | 259 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
260 | |
261 | /* add data to device queue */ | |
acd34afa | 262 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 263 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 264 | goto out; |
c6c8fea2 SE |
265 | } |
266 | ||
e5d89254 | 267 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 268 | if (!primary_if) |
44524fcd | 269 | goto out; |
c6c8fea2 SE |
270 | |
271 | /* answer echo request (ping) */ | |
272 | /* get routing information */ | |
da641193 | 273 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 274 | if (!orig_node) |
e1a5382f | 275 | goto out; |
c6c8fea2 | 276 | |
44524fcd | 277 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 278 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
279 | goto out; |
280 | ||
96412690 | 281 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
282 | |
283 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 284 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 285 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 286 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 287 | |
e91ecfc6 | 288 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 289 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 290 | |
44524fcd | 291 | out: |
32ae9b22 | 292 | if (primary_if) |
e5d89254 | 293 | batadv_hardif_free_ref(primary_if); |
44524fcd | 294 | if (orig_node) |
7d211efc | 295 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
296 | return ret; |
297 | } | |
298 | ||
56303d34 | 299 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 300 | struct sk_buff *skb) |
c6c8fea2 | 301 | { |
56303d34 SE |
302 | struct batadv_hard_iface *primary_if = NULL; |
303 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 304 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 305 | int ret = NET_RX_DROP; |
c6c8fea2 | 306 | |
96412690 | 307 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
308 | |
309 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 310 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
311 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
312 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 313 | goto out; |
c6c8fea2 SE |
314 | } |
315 | ||
e5d89254 | 316 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 317 | if (!primary_if) |
44524fcd | 318 | goto out; |
c6c8fea2 SE |
319 | |
320 | /* get routing information */ | |
da641193 | 321 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 322 | if (!orig_node) |
e1a5382f | 323 | goto out; |
c6c8fea2 | 324 | |
44524fcd | 325 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 326 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 327 | goto out; |
c6c8fea2 | 328 | |
96412690 | 329 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 330 | |
44524fcd | 331 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 332 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 333 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 334 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 335 | |
e91ecfc6 | 336 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 337 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 338 | |
44524fcd | 339 | out: |
32ae9b22 | 340 | if (primary_if) |
e5d89254 | 341 | batadv_hardif_free_ref(primary_if); |
44524fcd | 342 | if (orig_node) |
7d211efc | 343 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
344 | return ret; |
345 | } | |
346 | ||
347 | ||
56303d34 SE |
348 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
349 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 350 | { |
56303d34 | 351 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 352 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 353 | struct ethhdr *ethhdr; |
56303d34 | 354 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 355 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 356 | int ret = NET_RX_DROP; |
c6c8fea2 | 357 | |
9cfc7bd6 | 358 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
359 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
360 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
361 | |
362 | /* drop packet if it has not necessary minimum size */ | |
363 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 364 | goto out; |
c6c8fea2 | 365 | |
7ed4be95 | 366 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
367 | |
368 | /* packet with unicast indication but broadcast recipient */ | |
369 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 370 | goto out; |
c6c8fea2 SE |
371 | |
372 | /* packet with broadcast sender address */ | |
373 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 374 | goto out; |
c6c8fea2 SE |
375 | |
376 | /* not for me */ | |
fe8a93b9 | 377 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 378 | goto out; |
c6c8fea2 | 379 | |
96412690 | 380 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
381 | |
382 | /* add record route information if not full */ | |
96412690 | 383 | if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 384 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 385 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 386 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
387 | icmp_packet->rr_cur++; |
388 | } | |
389 | ||
390 | /* packet for me */ | |
fe8a93b9 | 391 | if (batadv_is_my_mac(bat_priv, icmp_packet->dst)) |
63b01037 | 392 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
393 | |
394 | /* TTL exceeded */ | |
76543d14 | 395 | if (icmp_packet->header.ttl < 2) |
63b01037 | 396 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 397 | |
c6c8fea2 | 398 | /* get routing information */ |
da641193 | 399 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 400 | if (!orig_node) |
e1a5382f | 401 | goto out; |
c6c8fea2 | 402 | |
44524fcd | 403 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 404 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 405 | goto out; |
c6c8fea2 | 406 | |
96412690 | 407 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 408 | |
44524fcd | 409 | /* decrement ttl */ |
76543d14 | 410 | icmp_packet->header.ttl--; |
44524fcd ML |
411 | |
412 | /* route it */ | |
e91ecfc6 | 413 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 414 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 415 | |
44524fcd | 416 | out: |
44524fcd | 417 | if (orig_node) |
7d211efc | 418 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
419 | return ret; |
420 | } | |
421 | ||
55158629 LL |
422 | /* In the bonding case, send the packets in a round |
423 | * robin fashion over the remaining interfaces. | |
424 | * | |
425 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
426 | * returned router's refcount. |
427 | */ | |
56303d34 SE |
428 | static struct batadv_neigh_node * |
429 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
430 | const struct batadv_hard_iface *recv_if) | |
55158629 | 431 | { |
56303d34 SE |
432 | struct batadv_neigh_node *tmp_neigh_node; |
433 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
434 | |
435 | rcu_read_lock(); | |
436 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
437 | bonding_list) { | |
438 | if (!first_candidate) | |
439 | first_candidate = tmp_neigh_node; | |
440 | ||
441 | /* recv_if == NULL on the first node. */ | |
442 | if (tmp_neigh_node->if_incoming == recv_if) | |
443 | continue; | |
444 | ||
445 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
446 | continue; | |
447 | ||
448 | router = tmp_neigh_node; | |
449 | break; | |
450 | } | |
451 | ||
452 | /* use the first candidate if nothing was found. */ | |
453 | if (!router && first_candidate && | |
454 | atomic_inc_not_zero(&first_candidate->refcount)) | |
455 | router = first_candidate; | |
456 | ||
457 | if (!router) | |
458 | goto out; | |
459 | ||
460 | /* selected should point to the next element | |
9cfc7bd6 SE |
461 | * after the current router |
462 | */ | |
55158629 LL |
463 | spin_lock_bh(&primary_orig->neigh_list_lock); |
464 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
465 | * does not exist as rcu version |
466 | */ | |
55158629 LL |
467 | list_del_rcu(&primary_orig->bond_list); |
468 | list_add_rcu(&primary_orig->bond_list, | |
469 | &router->bonding_list); | |
470 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
471 | ||
472 | out: | |
473 | rcu_read_unlock(); | |
474 | return router; | |
475 | } | |
476 | ||
477 | /* Interface Alternating: Use the best of the | |
478 | * remaining candidates which are not using | |
479 | * this interface. | |
480 | * | |
9cfc7bd6 SE |
481 | * Increases the returned router's refcount |
482 | */ | |
56303d34 SE |
483 | static struct batadv_neigh_node * |
484 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
485 | const struct batadv_hard_iface *recv_if) | |
55158629 | 486 | { |
56303d34 SE |
487 | struct batadv_neigh_node *tmp_neigh_node; |
488 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
489 | |
490 | rcu_read_lock(); | |
491 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
492 | bonding_list) { | |
493 | if (!first_candidate) | |
494 | first_candidate = tmp_neigh_node; | |
495 | ||
496 | /* recv_if == NULL on the first node. */ | |
497 | if (tmp_neigh_node->if_incoming == recv_if) | |
498 | continue; | |
499 | ||
fe3f4cfe SE |
500 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
501 | continue; | |
502 | ||
55158629 LL |
503 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
504 | continue; | |
505 | ||
fe3f4cfe SE |
506 | /* decrement refcount of previously selected router */ |
507 | if (router) | |
508 | batadv_neigh_node_free_ref(router); | |
55158629 | 509 | |
fe3f4cfe SE |
510 | /* we found a better router (or at least one valid router) */ |
511 | router = tmp_neigh_node; | |
55158629 LL |
512 | } |
513 | ||
514 | /* use the first candidate if nothing was found. */ | |
515 | if (!router && first_candidate && | |
516 | atomic_inc_not_zero(&first_candidate->refcount)) | |
517 | router = first_candidate; | |
518 | ||
519 | rcu_read_unlock(); | |
520 | return router; | |
521 | } | |
522 | ||
f86ce0ad MH |
523 | /** |
524 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 525 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
526 | * @skb: packet to check |
527 | * @hdr_size: size of header to pull | |
528 | * | |
529 | * Check for short header and bad addresses in given packet. Returns negative | |
530 | * value when check fails and 0 otherwise. The negative value depends on the | |
531 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
532 | * and -EREMOTE for non-local (other host) destination. | |
533 | */ | |
fe8a93b9 AQ |
534 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
535 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
536 | { |
537 | struct ethhdr *ethhdr; | |
538 | ||
539 | /* drop packet if it has not necessary minimum size */ | |
540 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 541 | return -ENODATA; |
ff51fd70 | 542 | |
7ed4be95 | 543 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
544 | |
545 | /* packet with unicast indication but broadcast recipient */ | |
546 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 547 | return -EBADR; |
ff51fd70 MH |
548 | |
549 | /* packet with broadcast sender address */ | |
550 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 551 | return -EBADR; |
ff51fd70 MH |
552 | |
553 | /* not for me */ | |
fe8a93b9 | 554 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 555 | return -EREMOTE; |
ff51fd70 MH |
556 | |
557 | return 0; | |
558 | } | |
559 | ||
56303d34 | 560 | int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
a73105b8 | 561 | { |
56303d34 | 562 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 563 | struct batadv_tt_query_packet *tt_query; |
f25bd58a | 564 | uint16_t tt_size; |
74ee3634 | 565 | int hdr_size = sizeof(*tt_query); |
1eda58bf | 566 | char tt_flag; |
96412690 | 567 | size_t packet_size; |
a73105b8 | 568 | |
fe8a93b9 | 569 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
74ee3634 | 570 | return NET_RX_DROP; |
a73105b8 AQ |
571 | |
572 | /* I could need to modify it */ | |
96412690 | 573 | if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) |
a73105b8 AQ |
574 | goto out; |
575 | ||
96412690 | 576 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 577 | |
7e071c79 | 578 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 579 | case BATADV_TT_REQUEST: |
d69909d2 | 580 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 581 | |
a73105b8 | 582 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
583 | * forwarded |
584 | */ | |
08c36d3e | 585 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
586 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
587 | tt_flag = 'F'; | |
588 | else | |
589 | tt_flag = '.'; | |
590 | ||
39c75a51 | 591 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
592 | "Routing TT_REQUEST to %pM [%c]\n", |
593 | tt_query->dst, | |
594 | tt_flag); | |
63b01037 | 595 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
596 | } |
597 | break; | |
acd34afa | 598 | case BATADV_TT_RESPONSE: |
d69909d2 | 599 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 600 | |
fe8a93b9 | 601 | if (batadv_is_my_mac(bat_priv, tt_query->dst)) { |
dc58fe32 | 602 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
603 | * changes |
604 | */ | |
dc58fe32 AQ |
605 | if (skb_linearize(skb) < 0) |
606 | goto out; | |
d2b6cc8e | 607 | /* skb_linearize() possibly changed skb->data */ |
96412690 | 608 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 609 | |
08c36d3e | 610 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
611 | |
612 | /* Ensure we have all the claimed data */ | |
96412690 SE |
613 | packet_size = sizeof(struct batadv_tt_query_packet); |
614 | packet_size += tt_size; | |
615 | if (unlikely(skb_headlen(skb) < packet_size)) | |
8b7342d6 AQ |
616 | goto out; |
617 | ||
08c36d3e | 618 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 619 | } else { |
acd34afa SE |
620 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
621 | tt_flag = 'F'; | |
622 | else | |
623 | tt_flag = '.'; | |
39c75a51 | 624 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
625 | "Routing TT_RESPONSE to %pM [%c]\n", |
626 | tt_query->dst, | |
627 | tt_flag); | |
63b01037 | 628 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
629 | } |
630 | break; | |
631 | } | |
632 | ||
633 | out: | |
634 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
635 | return NET_RX_DROP; | |
636 | } | |
637 | ||
56303d34 | 638 | int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
cc47f66e | 639 | { |
56303d34 | 640 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 641 | struct batadv_roam_adv_packet *roam_adv_packet; |
56303d34 | 642 | struct batadv_orig_node *orig_node; |
cc47f66e | 643 | |
fe8a93b9 AQ |
644 | if (batadv_check_unicast_packet(bat_priv, skb, |
645 | sizeof(*roam_adv_packet)) < 0) | |
cc47f66e AQ |
646 | goto out; |
647 | ||
d69909d2 | 648 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 649 | |
96412690 | 650 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; |
cc47f66e | 651 | |
fe8a93b9 | 652 | if (!batadv_is_my_mac(bat_priv, roam_adv_packet->dst)) |
63b01037 | 653 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 654 | |
20ff9d59 SW |
655 | /* check if it is a backbone gateway. we don't accept |
656 | * roaming advertisement from it, as it has the same | |
657 | * entries as we have. | |
658 | */ | |
08adf151 | 659 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
660 | goto out; |
661 | ||
da641193 | 662 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
663 | if (!orig_node) |
664 | goto out; | |
665 | ||
39c75a51 | 666 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
667 | "Received ROAMING_ADV from %pM (client %pM)\n", |
668 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 669 | |
08c36d3e | 670 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 671 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 672 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e | 673 | |
7d211efc | 674 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
675 | out: |
676 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
677 | return NET_RX_DROP; | |
678 | } | |
679 | ||
c6c8fea2 | 680 | /* find a suitable router for this originator, and use |
a4c135c5 | 681 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
682 | * refcount. |
683 | */ | |
56303d34 SE |
684 | struct batadv_neigh_node * |
685 | batadv_find_router(struct batadv_priv *bat_priv, | |
686 | struct batadv_orig_node *orig_node, | |
687 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 688 | { |
56303d34 SE |
689 | struct batadv_orig_node *primary_orig_node; |
690 | struct batadv_orig_node *router_orig; | |
691 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
692 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
693 | int bonding_enabled; | |
da641193 | 694 | uint8_t *primary_addr; |
c6c8fea2 SE |
695 | |
696 | if (!orig_node) | |
697 | return NULL; | |
698 | ||
7d211efc | 699 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 700 | if (!router) |
01df2b65 | 701 | goto err; |
c6c8fea2 SE |
702 | |
703 | /* without bonding, the first node should | |
9cfc7bd6 SE |
704 | * always choose the default router. |
705 | */ | |
c6c8fea2 SE |
706 | bonding_enabled = atomic_read(&bat_priv->bonding); |
707 | ||
a4c135c5 SW |
708 | rcu_read_lock(); |
709 | /* select default router to output */ | |
e1a5382f | 710 | router_orig = router->orig_node; |
01df2b65 ML |
711 | if (!router_orig) |
712 | goto err_unlock; | |
a4c135c5 | 713 | |
a4c135c5 SW |
714 | if ((!recv_if) && (!bonding_enabled)) |
715 | goto return_router; | |
c6c8fea2 | 716 | |
da641193 SE |
717 | primary_addr = router_orig->primary_addr; |
718 | ||
c6c8fea2 | 719 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
720 | * for a potential bonding candidate. |
721 | */ | |
1eda58bf | 722 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 723 | goto return_router; |
c6c8fea2 SE |
724 | |
725 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
726 | * even be the same as our router_orig in many cases |
727 | */ | |
1eda58bf | 728 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
729 | primary_orig_node = router_orig; |
730 | } else { | |
da641193 SE |
731 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
732 | primary_addr); | |
c6c8fea2 | 733 | if (!primary_orig_node) |
a4c135c5 | 734 | goto return_router; |
7aadf889 | 735 | |
7d211efc | 736 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
737 | } |
738 | ||
739 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
740 | * bonding and prefer the original router. |
741 | */ | |
a4c135c5 SW |
742 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
743 | goto return_router; | |
c6c8fea2 | 744 | |
c6c8fea2 SE |
745 | /* all nodes between should choose a candidate which |
746 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
747 | * in. |
748 | */ | |
7d211efc | 749 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 750 | |
55158629 | 751 | if (bonding_enabled) |
63b01037 | 752 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 753 | else |
63b01037 | 754 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 755 | |
a4c135c5 | 756 | return_router: |
e9a4f295 | 757 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
758 | goto err_unlock; |
759 | ||
a4c135c5 | 760 | rcu_read_unlock(); |
c6c8fea2 | 761 | return router; |
01df2b65 ML |
762 | err_unlock: |
763 | rcu_read_unlock(); | |
764 | err: | |
765 | if (router) | |
7d211efc | 766 | batadv_neigh_node_free_ref(router); |
01df2b65 | 767 | return NULL; |
c6c8fea2 SE |
768 | } |
769 | ||
63b01037 | 770 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 771 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 772 | { |
56303d34 SE |
773 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
774 | struct batadv_orig_node *orig_node = NULL; | |
775 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 776 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 777 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 778 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 SE |
779 | struct sk_buff *new_skb; |
780 | ||
96412690 | 781 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
782 | |
783 | /* TTL exceeded */ | |
76543d14 | 784 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
785 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
786 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 787 | goto out; |
c6c8fea2 SE |
788 | } |
789 | ||
790 | /* get routing information */ | |
da641193 | 791 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 792 | |
44524fcd | 793 | if (!orig_node) |
b5a6f69c | 794 | goto out; |
c6c8fea2 | 795 | |
a4c135c5 | 796 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 797 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 798 | |
d0072609 | 799 | if (!neigh_node) |
44524fcd | 800 | goto out; |
c6c8fea2 SE |
801 | |
802 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 803 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 804 | goto out; |
c6c8fea2 | 805 | |
96412690 | 806 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 807 | |
acd34afa | 808 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 809 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 810 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
811 | ret = batadv_frag_send_skb(skb, bat_priv, |
812 | neigh_node->if_incoming, | |
813 | neigh_node->addr); | |
d0072609 ML |
814 | goto out; |
815 | } | |
c6c8fea2 | 816 | |
acd34afa | 817 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
818 | batadv_frag_can_reassemble(skb, |
819 | neigh_node->if_incoming->net_dev->mtu)) { | |
88ed1e77 | 820 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
821 | |
822 | if (ret == NET_RX_DROP) | |
44524fcd | 823 | goto out; |
c6c8fea2 SE |
824 | |
825 | /* packet was buffered for late merge */ | |
44524fcd ML |
826 | if (!new_skb) { |
827 | ret = NET_RX_SUCCESS; | |
828 | goto out; | |
829 | } | |
c6c8fea2 SE |
830 | |
831 | skb = new_skb; | |
96412690 | 832 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
833 | } |
834 | ||
835 | /* decrement ttl */ | |
76543d14 | 836 | unicast_packet->header.ttl--; |
c6c8fea2 | 837 | |
c54f38c9 SW |
838 | switch (unicast_packet->header.packet_type) { |
839 | case BATADV_UNICAST_4ADDR: | |
840 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
841 | break; | |
842 | case BATADV_UNICAST: | |
843 | hdr_len = sizeof(struct batadv_unicast_packet); | |
844 | break; | |
845 | default: | |
846 | /* other packet types not supported - yet */ | |
847 | hdr_len = -1; | |
848 | break; | |
849 | } | |
850 | ||
851 | if (hdr_len > 0) | |
852 | batadv_skb_set_priority(skb, hdr_len); | |
853 | ||
e91ecfc6 | 854 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 855 | |
e91ecfc6 MH |
856 | /* translate transmit result into receive result */ |
857 | if (res == NET_XMIT_SUCCESS) { | |
858 | /* skb was transmitted and consumed */ | |
95332477 MH |
859 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
860 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
861 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
862 | |
863 | ret = NET_RX_SUCCESS; | |
864 | } else if (res == NET_XMIT_POLICED) { | |
865 | /* skb was buffered and consumed */ | |
866 | ret = NET_RX_SUCCESS; | |
95332477 | 867 | } |
c6c8fea2 | 868 | |
44524fcd ML |
869 | out: |
870 | if (neigh_node) | |
7d211efc | 871 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 872 | if (orig_node) |
7d211efc | 873 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 874 | return ret; |
c6c8fea2 SE |
875 | } |
876 | ||
7c1fd91d AQ |
877 | /** |
878 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
879 | * @bat_priv: the bat priv with all the soft interface information | |
880 | * @unicast_packet: the unicast header to be updated | |
881 | * @dst_addr: the payload destination | |
882 | * | |
883 | * Search the translation table for dst_addr and update the unicast header with | |
884 | * the new corresponding information (originator address where the destination | |
885 | * client currently is and its known TTVN) | |
886 | * | |
887 | * Returns true if the packet header has been updated, false otherwise | |
888 | */ | |
889 | static bool | |
890 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
891 | struct batadv_unicast_packet *unicast_packet, | |
892 | uint8_t *dst_addr) | |
893 | { | |
894 | struct batadv_orig_node *orig_node = NULL; | |
895 | struct batadv_hard_iface *primary_if = NULL; | |
896 | bool ret = false; | |
897 | uint8_t *orig_addr, orig_ttvn; | |
898 | ||
899 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
900 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
901 | if (!primary_if) | |
902 | goto out; | |
903 | orig_addr = primary_if->net_dev->dev_addr; | |
904 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
905 | } else { | |
906 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
907 | if (!orig_node) | |
908 | goto out; | |
909 | ||
910 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
911 | goto out; | |
912 | ||
913 | orig_addr = orig_node->orig; | |
914 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
915 | } | |
916 | ||
917 | /* update the packet header */ | |
918 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
919 | unicast_packet->ttvn = orig_ttvn; | |
920 | ||
921 | ret = true; | |
922 | out: | |
923 | if (primary_if) | |
924 | batadv_hardif_free_ref(primary_if); | |
925 | if (orig_node) | |
926 | batadv_orig_node_free_ref(orig_node); | |
927 | ||
928 | return ret; | |
929 | } | |
930 | ||
56303d34 | 931 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 932 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 933 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 934 | struct batadv_orig_node *orig_node; |
a73105b8 | 935 | struct ethhdr *ethhdr; |
56303d34 | 936 | struct batadv_hard_iface *primary_if; |
96412690 | 937 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 938 | int is_old_ttvn; |
a73105b8 | 939 | |
b8fcfa42 | 940 | /* check if there is enough data before accessing it */ |
dd981ab0 | 941 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
942 | return 0; |
943 | ||
944 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
945 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
946 | return 0; |
947 | ||
96412690 | 948 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 949 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 950 | |
7c1fd91d AQ |
951 | /* check if the destination client was served by this node and it is now |
952 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
953 | * message and that it knows the new destination in the mesh to re-route | |
954 | * the packet to | |
955 | */ | |
956 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
957 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
958 | ethhdr->h_dest)) | |
959 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
960 | bat_priv, | |
961 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
962 | unicast_packet->dest, | |
963 | ethhdr->h_dest); | |
964 | /* at this point the mesh destination should have been | |
965 | * substituted with the originator address found in the global | |
966 | * table. If not, let the packet go untouched anyway because | |
967 | * there is nothing the node can do | |
968 | */ | |
969 | return 1; | |
970 | } | |
971 | ||
972 | /* retrieve the TTVN known by this node for the packet destination. This | |
973 | * value is used later to check if the node which sent (or re-routed | |
974 | * last time) the packet had an updated information or not | |
975 | */ | |
976 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 977 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
978 | orig_node = batadv_orig_hash_find(bat_priv, |
979 | unicast_packet->dest); | |
7c1fd91d AQ |
980 | /* if it is not possible to find the orig_node representing the |
981 | * destination, the packet can immediately be dropped as it will | |
982 | * not be possible to deliver it | |
983 | */ | |
a73105b8 AQ |
984 | if (!orig_node) |
985 | return 0; | |
986 | ||
987 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 988 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
989 | } |
990 | ||
7c1fd91d AQ |
991 | /* check if the TTVN contained in the packet is fresher than what the |
992 | * node knows | |
993 | */ | |
3e34819e | 994 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
995 | if (!is_old_ttvn) |
996 | return 1; | |
a73105b8 | 997 | |
7c1fd91d AQ |
998 | old_ttvn = unicast_packet->ttvn; |
999 | /* the packet was forged based on outdated network information. Its | |
1000 | * destination can possibly be updated and forwarded towards the new | |
1001 | * target host | |
1002 | */ | |
1003 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
1004 | ethhdr->h_dest)) { | |
1005 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
1006 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
1007 | unicast_packet->dest, ethhdr->h_dest, | |
1008 | old_ttvn, curr_ttvn); | |
1009 | return 1; | |
1010 | } | |
3275e7cc | 1011 | |
7c1fd91d AQ |
1012 | /* the packet has not been re-routed: either the destination is |
1013 | * currently served by this node or there is no destination at all and | |
1014 | * it is possible to drop the packet | |
1015 | */ | |
1016 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
1017 | return 0; | |
3275e7cc | 1018 | |
7c1fd91d AQ |
1019 | /* update the header in order to let the packet be delivered to this |
1020 | * node's soft interface | |
1021 | */ | |
1022 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1023 | if (!primary_if) | |
1024 | return 0; | |
a73105b8 | 1025 | |
7c1fd91d AQ |
1026 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
1027 | ||
1028 | batadv_hardif_free_ref(primary_if); | |
1029 | ||
1030 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 1031 | |
a73105b8 AQ |
1032 | return 1; |
1033 | } | |
1034 | ||
56303d34 SE |
1035 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
1036 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1037 | { |
56303d34 | 1038 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1039 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 1040 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
1041 | uint8_t *orig_addr; |
1042 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 1043 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 1044 | bool is4addr; |
c6c8fea2 | 1045 | |
7cdcf6dd | 1046 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 1047 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 1048 | |
c384ea3e | 1049 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 1050 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 1051 | if (is4addr) |
4046b24a | 1052 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 1053 | |
612d2b4f | 1054 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 1055 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
1056 | |
1057 | /* Even though the packet is not for us, we might save it to use for | |
1058 | * decoding a later received coded packet | |
1059 | */ | |
1060 | if (check == -EREMOTE) | |
1061 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
1062 | ||
1063 | if (check < 0) | |
c6c8fea2 | 1064 | return NET_RX_DROP; |
dd981ab0 | 1065 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
1066 | return NET_RX_DROP; |
1067 | ||
c6c8fea2 | 1068 | /* packet for me */ |
fe8a93b9 | 1069 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 1070 | if (is4addr) { |
4046b24a MH |
1071 | batadv_dat_inc_counter(bat_priv, |
1072 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
1073 | orig_addr = unicast_4addr_packet->src; |
1074 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
1075 | } | |
4046b24a | 1076 | |
c384ea3e AQ |
1077 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1078 | hdr_size)) | |
1079 | goto rx_success; | |
1080 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1081 | hdr_size)) | |
1082 | goto rx_success; | |
1083 | ||
37135173 | 1084 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 1085 | orig_node); |
37135173 | 1086 | |
c384ea3e | 1087 | rx_success: |
9affec6b AQ |
1088 | if (orig_node) |
1089 | batadv_orig_node_free_ref(orig_node); | |
1090 | ||
c6c8fea2 SE |
1091 | return NET_RX_SUCCESS; |
1092 | } | |
1093 | ||
63b01037 | 1094 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1095 | } |
1096 | ||
30d3c511 | 1097 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1098 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1099 | { |
56303d34 | 1100 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1101 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1102 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1103 | struct sk_buff *new_skb = NULL; |
1104 | int ret; | |
1105 | ||
fe8a93b9 | 1106 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
c6c8fea2 SE |
1107 | return NET_RX_DROP; |
1108 | ||
dd981ab0 | 1109 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
1110 | return NET_RX_DROP; |
1111 | ||
96412690 | 1112 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1113 | |
1114 | /* packet for me */ | |
fe8a93b9 | 1115 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
88ed1e77 | 1116 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1117 | |
1118 | if (ret == NET_RX_DROP) | |
1119 | return NET_RX_DROP; | |
1120 | ||
1121 | /* packet was buffered for late merge */ | |
1122 | if (!new_skb) | |
1123 | return NET_RX_SUCCESS; | |
1124 | ||
c384ea3e AQ |
1125 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb, |
1126 | hdr_size)) | |
1127 | goto rx_success; | |
1128 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb, | |
1129 | hdr_size)) | |
1130 | goto rx_success; | |
1131 | ||
04b482a2 | 1132 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
37135173 | 1133 | sizeof(struct batadv_unicast_packet), NULL); |
c384ea3e AQ |
1134 | |
1135 | rx_success: | |
c6c8fea2 SE |
1136 | return NET_RX_SUCCESS; |
1137 | } | |
1138 | ||
63b01037 | 1139 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1140 | } |
1141 | ||
1142 | ||
56303d34 SE |
1143 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1144 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1145 | { |
56303d34 SE |
1146 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1147 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1148 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1149 | struct ethhdr *ethhdr; |
704509b8 | 1150 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1151 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1152 | int32_t seq_diff; |
1153 | ||
1154 | /* drop packet if it has not necessary minimum size */ | |
1155 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1156 | goto out; |
c6c8fea2 | 1157 | |
7ed4be95 | 1158 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1159 | |
1160 | /* packet with broadcast indication but unicast recipient */ | |
1161 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1162 | goto out; |
c6c8fea2 SE |
1163 | |
1164 | /* packet with broadcast sender address */ | |
1165 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1166 | goto out; |
c6c8fea2 SE |
1167 | |
1168 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1169 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1170 | goto out; |
c6c8fea2 | 1171 | |
96412690 | 1172 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1173 | |
1174 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1175 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1176 | goto out; |
c6c8fea2 | 1177 | |
76543d14 | 1178 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1179 | goto out; |
c6c8fea2 | 1180 | |
da641193 | 1181 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1182 | |
1183 | if (!orig_node) | |
b5a6f69c | 1184 | goto out; |
c6c8fea2 | 1185 | |
f3e0008f | 1186 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1187 | |
1188 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1189 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1190 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1191 | goto spin_unlock; |
c6c8fea2 SE |
1192 | |
1193 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1194 | ||
1195 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1196 | if (batadv_window_protected(bat_priv, seq_diff, |
1197 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1198 | goto spin_unlock; |
c6c8fea2 SE |
1199 | |
1200 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1201 | * if required. |
1202 | */ | |
0f5f9322 | 1203 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1204 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1205 | ||
f3e0008f | 1206 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1207 | |
fe2da6ff | 1208 | /* check whether this has been sent by another originator before */ |
004e86fc | 1209 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1210 | goto out; |
1211 | ||
c54f38c9 SW |
1212 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1213 | ||
c6c8fea2 | 1214 | /* rebroadcast packet */ |
9455e34c | 1215 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1216 | |
23721387 SW |
1217 | /* don't hand the broadcast up if it is from an originator |
1218 | * from the same backbone. | |
1219 | */ | |
08adf151 | 1220 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1221 | goto out; |
1222 | ||
c384ea3e AQ |
1223 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1224 | goto rx_success; | |
1225 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1226 | goto rx_success; | |
1227 | ||
c6c8fea2 | 1228 | /* broadcast for me */ |
37135173 AQ |
1229 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1230 | orig_node); | |
c384ea3e AQ |
1231 | |
1232 | rx_success: | |
f3e0008f ML |
1233 | ret = NET_RX_SUCCESS; |
1234 | goto out; | |
c6c8fea2 | 1235 | |
f3e0008f ML |
1236 | spin_unlock: |
1237 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1238 | out: |
1239 | if (orig_node) | |
7d211efc | 1240 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1241 | return ret; |
c6c8fea2 SE |
1242 | } |
1243 | ||
56303d34 SE |
1244 | int batadv_recv_vis_packet(struct sk_buff *skb, |
1245 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1246 | { |
96412690 | 1247 | struct batadv_vis_packet *vis_packet; |
c6c8fea2 | 1248 | struct ethhdr *ethhdr; |
56303d34 | 1249 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704509b8 | 1250 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1251 | |
1252 | /* keep skb linear */ | |
1253 | if (skb_linearize(skb) < 0) | |
1254 | return NET_RX_DROP; | |
1255 | ||
1256 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1257 | return NET_RX_DROP; | |
1258 | ||
96412690 | 1259 | vis_packet = (struct batadv_vis_packet *)skb->data; |
7ed4be95 | 1260 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1261 | |
1262 | /* not for me */ | |
fe8a93b9 | 1263 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
c6c8fea2 SE |
1264 | return NET_RX_DROP; |
1265 | ||
1266 | /* ignore own packets */ | |
fe8a93b9 | 1267 | if (batadv_is_my_mac(bat_priv, vis_packet->vis_orig)) |
c6c8fea2 SE |
1268 | return NET_RX_DROP; |
1269 | ||
fe8a93b9 | 1270 | if (batadv_is_my_mac(bat_priv, vis_packet->sender_orig)) |
c6c8fea2 SE |
1271 | return NET_RX_DROP; |
1272 | ||
1273 | switch (vis_packet->vis_type) { | |
acd34afa | 1274 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1275 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1276 | skb_headlen(skb)); | |
c6c8fea2 SE |
1277 | break; |
1278 | ||
acd34afa | 1279 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1280 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1281 | skb_headlen(skb)); | |
c6c8fea2 SE |
1282 | break; |
1283 | ||
1284 | default: /* ignore unknown packet */ | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1289 | * always free the skbuf. |
1290 | */ | |
c6c8fea2 SE |
1291 | return NET_RX_DROP; |
1292 | } |