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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" | |
23721387 | 28 | #include "bridge_loop_avoidance.h" |
c384ea3e | 29 | #include "distributed-arp-table.h" |
95332477 | 30 | #include "network-coding.h" |
c6c8fea2 | 31 | |
63b01037 | 32 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 33 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 34 | |
56303d34 SE |
35 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
36 | struct batadv_orig_node *orig_node, | |
37 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 38 | { |
56303d34 | 39 | struct batadv_neigh_node *curr_router; |
e1a5382f | 40 | |
7d211efc | 41 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 42 | |
c6c8fea2 | 43 | /* route deleted */ |
e1a5382f | 44 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
45 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
46 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
47 | batadv_tt_global_del_orig(bat_priv, orig_node, |
48 | "Deleted route towards originator"); | |
c6c8fea2 | 49 | |
e1a5382f LL |
50 | /* route added */ |
51 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 52 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
53 | "Adding route towards: %pM (via %pM)\n", |
54 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 55 | /* route changed */ |
bb899b89 | 56 | } else if (neigh_node && curr_router) { |
39c75a51 | 57 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
58 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
59 | orig_node->orig, neigh_node->addr, | |
60 | curr_router->addr); | |
c6c8fea2 SE |
61 | } |
62 | ||
e1a5382f | 63 | if (curr_router) |
7d211efc | 64 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
65 | |
66 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
67 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
68 | neigh_node = NULL; | |
e1a5382f LL |
69 | |
70 | spin_lock_bh(&orig_node->neigh_list_lock); | |
71 | rcu_assign_pointer(orig_node->router, neigh_node); | |
72 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
73 | ||
74 | /* decrease refcount of previous best neighbor */ | |
75 | if (curr_router) | |
7d211efc | 76 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
77 | } |
78 | ||
56303d34 SE |
79 | void batadv_update_route(struct batadv_priv *bat_priv, |
80 | struct batadv_orig_node *orig_node, | |
81 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 82 | { |
56303d34 | 83 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
84 | |
85 | if (!orig_node) | |
e1a5382f LL |
86 | goto out; |
87 | ||
7d211efc | 88 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 89 | |
e1a5382f | 90 | if (router != neigh_node) |
63b01037 | 91 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
92 | |
93 | out: | |
94 | if (router) | |
7d211efc | 95 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
96 | } |
97 | ||
a4c135c5 | 98 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
99 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
100 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
101 | { |
102 | /* this neighbor is not part of our candidate list */ | |
103 | if (list_empty(&neigh_node->bonding_list)) | |
104 | goto out; | |
105 | ||
106 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 107 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 108 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
109 | atomic_dec(&orig_node->bond_candidates); |
110 | ||
111 | out: | |
112 | return; | |
113 | } | |
114 | ||
56303d34 SE |
115 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
116 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 117 | { |
56303d34 | 118 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 119 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
120 | |
121 | spin_lock_bh(&orig_node->neigh_list_lock); | |
122 | ||
123 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
124 | if (!batadv_compare_eth(orig_node->orig, |
125 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
126 | goto candidate_del; |
127 | ||
7d211efc | 128 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 129 | if (!router) |
a4c135c5 SW |
130 | goto candidate_del; |
131 | ||
a4c135c5 | 132 | /* ... and is good enough to be considered */ |
42d0b044 | 133 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
134 | goto candidate_del; |
135 | ||
9cfc7bd6 | 136 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
137 | * interface. If we do, we won't select this candidate because of |
138 | * possible interference. | |
139 | */ | |
b67bfe0d | 140 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 141 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
142 | if (tmp_neigh_node == neigh_node) |
143 | continue; | |
144 | ||
145 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
146 | * considered as candidate. |
147 | */ | |
a4c135c5 SW |
148 | if (list_empty(&tmp_neigh_node->bonding_list)) |
149 | continue; | |
150 | ||
151 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
152 | (batadv_compare_eth(neigh_node->addr, |
153 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
154 | interference_candidate = 1; |
155 | break; | |
156 | } | |
157 | } | |
158 | ||
159 | /* don't care further if it is an interference candidate */ | |
160 | if (interference_candidate) | |
161 | goto candidate_del; | |
162 | ||
163 | /* this neighbor already is part of our candidate list */ | |
164 | if (!list_empty(&neigh_node->bonding_list)) | |
165 | goto out; | |
166 | ||
44524fcd ML |
167 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
168 | goto out; | |
169 | ||
a4c135c5 | 170 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
171 | atomic_inc(&orig_node->bond_candidates); |
172 | goto out; | |
173 | ||
174 | candidate_del: | |
30d3c511 | 175 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
176 | |
177 | out: | |
178 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
179 | |
180 | if (router) | |
7d211efc | 181 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
182 | } |
183 | ||
184 | /* copy primary address for bonding */ | |
30d3c511 | 185 | void |
56303d34 SE |
186 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
187 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 188 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 189 | { |
acd34afa | 190 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
191 | return; |
192 | ||
193 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
194 | } | |
195 | ||
c6c8fea2 SE |
196 | /* checks whether the host restarted and is in the protection time. |
197 | * returns: | |
198 | * 0 if the packet is to be accepted | |
199 | * 1 if the packet is to be ignored. | |
200 | */ | |
56303d34 | 201 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 202 | unsigned long *last_reset) |
c6c8fea2 | 203 | { |
42d0b044 SE |
204 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
205 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
206 | if (!batadv_has_timed_out(*last_reset, | |
207 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 208 | return 1; |
8c7bf248 ML |
209 | |
210 | *last_reset = jiffies; | |
39c75a51 | 211 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 212 | "old packet received, start protection\n"); |
c6c8fea2 | 213 | } |
8c7bf248 | 214 | |
c6c8fea2 SE |
215 | return 0; |
216 | } | |
217 | ||
30d3c511 | 218 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 219 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 220 | int header_len) |
c6c8fea2 | 221 | { |
c6c8fea2 SE |
222 | struct ethhdr *ethhdr; |
223 | ||
224 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
225 | if (unlikely(!pskb_may_pull(skb, header_len))) |
226 | return false; | |
c6c8fea2 | 227 | |
7ed4be95 | 228 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
229 | |
230 | /* packet with broadcast indication but unicast recipient */ | |
231 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 232 | return false; |
c6c8fea2 SE |
233 | |
234 | /* packet with broadcast sender address */ | |
235 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 236 | return false; |
c6c8fea2 SE |
237 | |
238 | /* create a copy of the skb, if needed, to modify it. */ | |
239 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 240 | return false; |
c6c8fea2 SE |
241 | |
242 | /* keep skb linear */ | |
243 | if (skb_linearize(skb) < 0) | |
c3e29312 | 244 | return false; |
c6c8fea2 | 245 | |
c3e29312 | 246 | return true; |
c6c8fea2 SE |
247 | } |
248 | ||
56303d34 | 249 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 250 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 251 | { |
56303d34 SE |
252 | struct batadv_hard_iface *primary_if = NULL; |
253 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 254 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 255 | int ret = NET_RX_DROP; |
c6c8fea2 | 256 | |
96412690 | 257 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
258 | |
259 | /* add data to device queue */ | |
acd34afa | 260 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 261 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 262 | goto out; |
c6c8fea2 SE |
263 | } |
264 | ||
e5d89254 | 265 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 266 | if (!primary_if) |
44524fcd | 267 | goto out; |
c6c8fea2 SE |
268 | |
269 | /* answer echo request (ping) */ | |
270 | /* get routing information */ | |
da641193 | 271 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 272 | if (!orig_node) |
e1a5382f | 273 | goto out; |
c6c8fea2 | 274 | |
44524fcd | 275 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 276 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
277 | goto out; |
278 | ||
96412690 | 279 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
280 | |
281 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 282 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 283 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 284 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 285 | |
e91ecfc6 | 286 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 287 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 288 | |
44524fcd | 289 | out: |
32ae9b22 | 290 | if (primary_if) |
e5d89254 | 291 | batadv_hardif_free_ref(primary_if); |
44524fcd | 292 | if (orig_node) |
7d211efc | 293 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
294 | return ret; |
295 | } | |
296 | ||
56303d34 | 297 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 298 | struct sk_buff *skb) |
c6c8fea2 | 299 | { |
56303d34 SE |
300 | struct batadv_hard_iface *primary_if = NULL; |
301 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 302 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 303 | int ret = NET_RX_DROP; |
c6c8fea2 | 304 | |
96412690 | 305 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
306 | |
307 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 308 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
309 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
310 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 311 | goto out; |
c6c8fea2 SE |
312 | } |
313 | ||
e5d89254 | 314 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 315 | if (!primary_if) |
44524fcd | 316 | goto out; |
c6c8fea2 SE |
317 | |
318 | /* get routing information */ | |
da641193 | 319 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 320 | if (!orig_node) |
e1a5382f | 321 | goto out; |
c6c8fea2 | 322 | |
44524fcd | 323 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 324 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 325 | goto out; |
c6c8fea2 | 326 | |
96412690 | 327 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 328 | |
44524fcd | 329 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 330 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 331 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 332 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 333 | |
e91ecfc6 | 334 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 335 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 336 | |
44524fcd | 337 | out: |
32ae9b22 | 338 | if (primary_if) |
e5d89254 | 339 | batadv_hardif_free_ref(primary_if); |
44524fcd | 340 | if (orig_node) |
7d211efc | 341 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
342 | return ret; |
343 | } | |
344 | ||
345 | ||
56303d34 SE |
346 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
347 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 348 | { |
56303d34 | 349 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 350 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 351 | struct ethhdr *ethhdr; |
56303d34 | 352 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 353 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 354 | int ret = NET_RX_DROP; |
c6c8fea2 | 355 | |
9cfc7bd6 | 356 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
357 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
358 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
359 | |
360 | /* drop packet if it has not necessary minimum size */ | |
361 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 362 | goto out; |
c6c8fea2 | 363 | |
7ed4be95 | 364 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
365 | |
366 | /* packet with unicast indication but broadcast recipient */ | |
367 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 368 | goto out; |
c6c8fea2 SE |
369 | |
370 | /* packet with broadcast sender address */ | |
371 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 372 | goto out; |
c6c8fea2 SE |
373 | |
374 | /* not for me */ | |
fe8a93b9 | 375 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 376 | goto out; |
c6c8fea2 | 377 | |
96412690 | 378 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
379 | |
380 | /* add record route information if not full */ | |
97dbc03b SW |
381 | if ((icmp_packet->msg_type == BATADV_ECHO_REPLY || |
382 | icmp_packet->msg_type == BATADV_ECHO_REQUEST) && | |
383 | (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 | ||
c6c8fea2 | 560 | /* find a suitable router for this originator, and use |
a4c135c5 | 561 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
562 | * refcount. |
563 | */ | |
56303d34 SE |
564 | struct batadv_neigh_node * |
565 | batadv_find_router(struct batadv_priv *bat_priv, | |
566 | struct batadv_orig_node *orig_node, | |
567 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 568 | { |
56303d34 SE |
569 | struct batadv_orig_node *primary_orig_node; |
570 | struct batadv_orig_node *router_orig; | |
571 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
572 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
573 | int bonding_enabled; | |
da641193 | 574 | uint8_t *primary_addr; |
c6c8fea2 SE |
575 | |
576 | if (!orig_node) | |
577 | return NULL; | |
578 | ||
7d211efc | 579 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 580 | if (!router) |
01df2b65 | 581 | goto err; |
c6c8fea2 SE |
582 | |
583 | /* without bonding, the first node should | |
9cfc7bd6 SE |
584 | * always choose the default router. |
585 | */ | |
c6c8fea2 SE |
586 | bonding_enabled = atomic_read(&bat_priv->bonding); |
587 | ||
a4c135c5 SW |
588 | rcu_read_lock(); |
589 | /* select default router to output */ | |
e1a5382f | 590 | router_orig = router->orig_node; |
01df2b65 ML |
591 | if (!router_orig) |
592 | goto err_unlock; | |
a4c135c5 | 593 | |
a4c135c5 SW |
594 | if ((!recv_if) && (!bonding_enabled)) |
595 | goto return_router; | |
c6c8fea2 | 596 | |
da641193 SE |
597 | primary_addr = router_orig->primary_addr; |
598 | ||
c6c8fea2 | 599 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
600 | * for a potential bonding candidate. |
601 | */ | |
1eda58bf | 602 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 603 | goto return_router; |
c6c8fea2 SE |
604 | |
605 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
606 | * even be the same as our router_orig in many cases |
607 | */ | |
1eda58bf | 608 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
609 | primary_orig_node = router_orig; |
610 | } else { | |
da641193 SE |
611 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
612 | primary_addr); | |
c6c8fea2 | 613 | if (!primary_orig_node) |
a4c135c5 | 614 | goto return_router; |
7aadf889 | 615 | |
7d211efc | 616 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
617 | } |
618 | ||
619 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
620 | * bonding and prefer the original router. |
621 | */ | |
a4c135c5 SW |
622 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
623 | goto return_router; | |
c6c8fea2 | 624 | |
c6c8fea2 SE |
625 | /* all nodes between should choose a candidate which |
626 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
627 | * in. |
628 | */ | |
7d211efc | 629 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 630 | |
55158629 | 631 | if (bonding_enabled) |
63b01037 | 632 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 633 | else |
63b01037 | 634 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 635 | |
a4c135c5 | 636 | return_router: |
e9a4f295 | 637 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
638 | goto err_unlock; |
639 | ||
a4c135c5 | 640 | rcu_read_unlock(); |
c6c8fea2 | 641 | return router; |
01df2b65 ML |
642 | err_unlock: |
643 | rcu_read_unlock(); | |
644 | err: | |
645 | if (router) | |
7d211efc | 646 | batadv_neigh_node_free_ref(router); |
01df2b65 | 647 | return NULL; |
c6c8fea2 SE |
648 | } |
649 | ||
63b01037 | 650 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 651 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 652 | { |
56303d34 SE |
653 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
654 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 655 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 656 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 657 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 658 | |
96412690 | 659 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
660 | |
661 | /* TTL exceeded */ | |
76543d14 | 662 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
663 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
664 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 665 | goto out; |
c6c8fea2 SE |
666 | } |
667 | ||
668 | /* get routing information */ | |
da641193 | 669 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 670 | |
44524fcd | 671 | if (!orig_node) |
b5a6f69c | 672 | goto out; |
c6c8fea2 | 673 | |
c6c8fea2 | 674 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 675 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 676 | goto out; |
c6c8fea2 | 677 | |
c6c8fea2 | 678 | /* decrement ttl */ |
f097e25d | 679 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 680 | unicast_packet->header.ttl--; |
c6c8fea2 | 681 | |
c54f38c9 SW |
682 | switch (unicast_packet->header.packet_type) { |
683 | case BATADV_UNICAST_4ADDR: | |
684 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
685 | break; | |
686 | case BATADV_UNICAST: | |
687 | hdr_len = sizeof(struct batadv_unicast_packet); | |
688 | break; | |
689 | default: | |
690 | /* other packet types not supported - yet */ | |
691 | hdr_len = -1; | |
692 | break; | |
693 | } | |
694 | ||
695 | if (hdr_len > 0) | |
696 | batadv_skb_set_priority(skb, hdr_len); | |
697 | ||
e91ecfc6 | 698 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 699 | |
e91ecfc6 MH |
700 | /* translate transmit result into receive result */ |
701 | if (res == NET_XMIT_SUCCESS) { | |
702 | /* skb was transmitted and consumed */ | |
95332477 MH |
703 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
704 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
705 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
706 | |
707 | ret = NET_RX_SUCCESS; | |
708 | } else if (res == NET_XMIT_POLICED) { | |
709 | /* skb was buffered and consumed */ | |
710 | ret = NET_RX_SUCCESS; | |
95332477 | 711 | } |
c6c8fea2 | 712 | |
44524fcd | 713 | out: |
44524fcd | 714 | if (orig_node) |
7d211efc | 715 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 716 | return ret; |
c6c8fea2 SE |
717 | } |
718 | ||
7c1fd91d AQ |
719 | /** |
720 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
721 | * @bat_priv: the bat priv with all the soft interface information | |
722 | * @unicast_packet: the unicast header to be updated | |
723 | * @dst_addr: the payload destination | |
724 | * | |
725 | * Search the translation table for dst_addr and update the unicast header with | |
726 | * the new corresponding information (originator address where the destination | |
727 | * client currently is and its known TTVN) | |
728 | * | |
729 | * Returns true if the packet header has been updated, false otherwise | |
730 | */ | |
731 | static bool | |
732 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
733 | struct batadv_unicast_packet *unicast_packet, | |
734 | uint8_t *dst_addr) | |
735 | { | |
736 | struct batadv_orig_node *orig_node = NULL; | |
737 | struct batadv_hard_iface *primary_if = NULL; | |
738 | bool ret = false; | |
739 | uint8_t *orig_addr, orig_ttvn; | |
740 | ||
741 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
742 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
743 | if (!primary_if) | |
744 | goto out; | |
745 | orig_addr = primary_if->net_dev->dev_addr; | |
746 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
747 | } else { | |
748 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
749 | if (!orig_node) | |
750 | goto out; | |
751 | ||
752 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
753 | goto out; | |
754 | ||
755 | orig_addr = orig_node->orig; | |
756 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
757 | } | |
758 | ||
759 | /* update the packet header */ | |
760 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
761 | unicast_packet->ttvn = orig_ttvn; | |
762 | ||
763 | ret = true; | |
764 | out: | |
765 | if (primary_if) | |
766 | batadv_hardif_free_ref(primary_if); | |
767 | if (orig_node) | |
768 | batadv_orig_node_free_ref(orig_node); | |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
56303d34 | 773 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 774 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 775 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 776 | struct batadv_orig_node *orig_node; |
a73105b8 | 777 | struct ethhdr *ethhdr; |
56303d34 | 778 | struct batadv_hard_iface *primary_if; |
96412690 | 779 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 780 | int is_old_ttvn; |
a73105b8 | 781 | |
b8fcfa42 | 782 | /* check if there is enough data before accessing it */ |
dd981ab0 | 783 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
784 | return 0; |
785 | ||
786 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
787 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
788 | return 0; |
789 | ||
96412690 | 790 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 791 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 792 | |
7c1fd91d AQ |
793 | /* check if the destination client was served by this node and it is now |
794 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
795 | * message and that it knows the new destination in the mesh to re-route | |
796 | * the packet to | |
797 | */ | |
798 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
799 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
800 | ethhdr->h_dest)) | |
801 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
802 | bat_priv, | |
803 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
804 | unicast_packet->dest, | |
805 | ethhdr->h_dest); | |
806 | /* at this point the mesh destination should have been | |
807 | * substituted with the originator address found in the global | |
808 | * table. If not, let the packet go untouched anyway because | |
809 | * there is nothing the node can do | |
810 | */ | |
811 | return 1; | |
812 | } | |
813 | ||
814 | /* retrieve the TTVN known by this node for the packet destination. This | |
815 | * value is used later to check if the node which sent (or re-routed | |
816 | * last time) the packet had an updated information or not | |
817 | */ | |
818 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 819 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
820 | orig_node = batadv_orig_hash_find(bat_priv, |
821 | unicast_packet->dest); | |
7c1fd91d AQ |
822 | /* if it is not possible to find the orig_node representing the |
823 | * destination, the packet can immediately be dropped as it will | |
824 | * not be possible to deliver it | |
825 | */ | |
a73105b8 AQ |
826 | if (!orig_node) |
827 | return 0; | |
828 | ||
829 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 830 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
831 | } |
832 | ||
7c1fd91d AQ |
833 | /* check if the TTVN contained in the packet is fresher than what the |
834 | * node knows | |
835 | */ | |
3e34819e | 836 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
837 | if (!is_old_ttvn) |
838 | return 1; | |
a73105b8 | 839 | |
7c1fd91d AQ |
840 | old_ttvn = unicast_packet->ttvn; |
841 | /* the packet was forged based on outdated network information. Its | |
842 | * destination can possibly be updated and forwarded towards the new | |
843 | * target host | |
844 | */ | |
845 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
846 | ethhdr->h_dest)) { | |
847 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
848 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
849 | unicast_packet->dest, ethhdr->h_dest, | |
850 | old_ttvn, curr_ttvn); | |
851 | return 1; | |
852 | } | |
3275e7cc | 853 | |
7c1fd91d AQ |
854 | /* the packet has not been re-routed: either the destination is |
855 | * currently served by this node or there is no destination at all and | |
856 | * it is possible to drop the packet | |
857 | */ | |
858 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
859 | return 0; | |
3275e7cc | 860 | |
7c1fd91d AQ |
861 | /* update the header in order to let the packet be delivered to this |
862 | * node's soft interface | |
863 | */ | |
864 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
865 | if (!primary_if) | |
866 | return 0; | |
a73105b8 | 867 | |
7c1fd91d AQ |
868 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
869 | ||
870 | batadv_hardif_free_ref(primary_if); | |
871 | ||
872 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 873 | |
a73105b8 AQ |
874 | return 1; |
875 | } | |
876 | ||
a1f1ac5c SW |
877 | /** |
878 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
879 | * are in the unicast number space but not yet known to the implementation | |
880 | * @skb: unicast tvlv packet to process | |
881 | * @recv_if: pointer to interface this packet was received on | |
882 | * | |
883 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
884 | * otherwise. | |
885 | */ | |
886 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
887 | struct batadv_hard_iface *recv_if) | |
888 | { | |
889 | struct batadv_unicast_packet *unicast_packet; | |
890 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
891 | int check, hdr_size = sizeof(*unicast_packet); | |
892 | ||
893 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
894 | if (check < 0) | |
895 | return NET_RX_DROP; | |
896 | ||
897 | /* we don't know about this type, drop it. */ | |
898 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
899 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
900 | return NET_RX_DROP; | |
901 | ||
902 | return batadv_route_unicast_packet(skb, recv_if); | |
903 | } | |
904 | ||
56303d34 SE |
905 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
906 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 907 | { |
56303d34 | 908 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 909 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 910 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
911 | uint8_t *orig_addr; |
912 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 913 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 914 | bool is4addr; |
c6c8fea2 | 915 | |
7cdcf6dd | 916 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 917 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 918 | |
c384ea3e | 919 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 920 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 921 | if (is4addr) |
4046b24a | 922 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 923 | |
612d2b4f | 924 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 925 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
926 | |
927 | /* Even though the packet is not for us, we might save it to use for | |
928 | * decoding a later received coded packet | |
929 | */ | |
930 | if (check == -EREMOTE) | |
931 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
932 | ||
933 | if (check < 0) | |
c6c8fea2 | 934 | return NET_RX_DROP; |
dd981ab0 | 935 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
936 | return NET_RX_DROP; |
937 | ||
c6c8fea2 | 938 | /* packet for me */ |
fe8a93b9 | 939 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 940 | if (is4addr) { |
4046b24a MH |
941 | batadv_dat_inc_counter(bat_priv, |
942 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
943 | orig_addr = unicast_4addr_packet->src; |
944 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
945 | } | |
4046b24a | 946 | |
c384ea3e AQ |
947 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
948 | hdr_size)) | |
949 | goto rx_success; | |
950 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
951 | hdr_size)) | |
952 | goto rx_success; | |
953 | ||
37135173 | 954 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 955 | orig_node); |
37135173 | 956 | |
c384ea3e | 957 | rx_success: |
9affec6b AQ |
958 | if (orig_node) |
959 | batadv_orig_node_free_ref(orig_node); | |
960 | ||
c6c8fea2 SE |
961 | return NET_RX_SUCCESS; |
962 | } | |
963 | ||
63b01037 | 964 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
965 | } |
966 | ||
ef261577 ML |
967 | /** |
968 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
969 | * @skb: unicast tvlv packet to process | |
970 | * @recv_if: pointer to interface this packet was received on | |
971 | * @dst_addr: the payload destination | |
972 | * | |
973 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
974 | * otherwise. | |
975 | */ | |
976 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
977 | struct batadv_hard_iface *recv_if) | |
978 | { | |
979 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
980 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
981 | unsigned char *tvlv_buff; | |
982 | uint16_t tvlv_buff_len; | |
983 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
984 | int ret = NET_RX_DROP; | |
985 | ||
986 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
987 | return NET_RX_DROP; | |
988 | ||
989 | /* the header is likely to be modified while forwarding */ | |
990 | if (skb_cow(skb, hdr_size) < 0) | |
991 | return NET_RX_DROP; | |
992 | ||
993 | /* packet needs to be linearized to access the tvlv content */ | |
994 | if (skb_linearize(skb) < 0) | |
995 | return NET_RX_DROP; | |
996 | ||
997 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
998 | ||
999 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1000 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1001 | ||
1002 | if (tvlv_buff_len > skb->len - hdr_size) | |
1003 | return NET_RX_DROP; | |
1004 | ||
1005 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1006 | unicast_tvlv_packet->src, | |
1007 | unicast_tvlv_packet->dst, | |
1008 | tvlv_buff, tvlv_buff_len); | |
1009 | ||
1010 | if (ret != NET_RX_SUCCESS) | |
1011 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1012 | ||
1013 | return ret; | |
1014 | } | |
c6c8fea2 | 1015 | |
56303d34 SE |
1016 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1017 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1018 | { |
56303d34 SE |
1019 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1020 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1021 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1022 | struct ethhdr *ethhdr; |
704509b8 | 1023 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1024 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1025 | int32_t seq_diff; |
1026 | ||
1027 | /* drop packet if it has not necessary minimum size */ | |
1028 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1029 | goto out; |
c6c8fea2 | 1030 | |
7ed4be95 | 1031 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1032 | |
1033 | /* packet with broadcast indication but unicast recipient */ | |
1034 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1035 | goto out; |
c6c8fea2 SE |
1036 | |
1037 | /* packet with broadcast sender address */ | |
1038 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1039 | goto out; |
c6c8fea2 SE |
1040 | |
1041 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1042 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1043 | goto out; |
c6c8fea2 | 1044 | |
96412690 | 1045 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1046 | |
1047 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1048 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1049 | goto out; |
c6c8fea2 | 1050 | |
76543d14 | 1051 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1052 | goto out; |
c6c8fea2 | 1053 | |
da641193 | 1054 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1055 | |
1056 | if (!orig_node) | |
b5a6f69c | 1057 | goto out; |
c6c8fea2 | 1058 | |
f3e0008f | 1059 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1060 | |
1061 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1062 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1063 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1064 | goto spin_unlock; |
c6c8fea2 SE |
1065 | |
1066 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1067 | ||
1068 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1069 | if (batadv_window_protected(bat_priv, seq_diff, |
1070 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1071 | goto spin_unlock; |
c6c8fea2 SE |
1072 | |
1073 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1074 | * if required. |
1075 | */ | |
0f5f9322 | 1076 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1077 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1078 | ||
f3e0008f | 1079 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1080 | |
fe2da6ff | 1081 | /* check whether this has been sent by another originator before */ |
004e86fc | 1082 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1083 | goto out; |
1084 | ||
c54f38c9 SW |
1085 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1086 | ||
c6c8fea2 | 1087 | /* rebroadcast packet */ |
9455e34c | 1088 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1089 | |
23721387 SW |
1090 | /* don't hand the broadcast up if it is from an originator |
1091 | * from the same backbone. | |
1092 | */ | |
08adf151 | 1093 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1094 | goto out; |
1095 | ||
c384ea3e AQ |
1096 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1097 | goto rx_success; | |
1098 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1099 | goto rx_success; | |
1100 | ||
c6c8fea2 | 1101 | /* broadcast for me */ |
37135173 AQ |
1102 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1103 | orig_node); | |
c384ea3e AQ |
1104 | |
1105 | rx_success: | |
f3e0008f ML |
1106 | ret = NET_RX_SUCCESS; |
1107 | goto out; | |
c6c8fea2 | 1108 | |
f3e0008f ML |
1109 | spin_unlock: |
1110 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1111 | out: |
1112 | if (orig_node) | |
7d211efc | 1113 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1114 | return ret; |
c6c8fea2 | 1115 | } |