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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 "unicast.h" |
23721387 | 29 | #include "bridge_loop_avoidance.h" |
c384ea3e | 30 | #include "distributed-arp-table.h" |
95332477 | 31 | #include "network-coding.h" |
c6c8fea2 | 32 | |
63b01037 | 33 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 34 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 35 | |
56303d34 SE |
36 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
37 | struct batadv_orig_node *orig_node, | |
38 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 39 | { |
56303d34 | 40 | struct batadv_neigh_node *curr_router; |
e1a5382f | 41 | |
7d211efc | 42 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 43 | |
c6c8fea2 | 44 | /* route deleted */ |
e1a5382f | 45 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
46 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
47 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
48 | batadv_tt_global_del_orig(bat_priv, orig_node, |
49 | "Deleted route towards originator"); | |
c6c8fea2 | 50 | |
e1a5382f LL |
51 | /* route added */ |
52 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 53 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
54 | "Adding route towards: %pM (via %pM)\n", |
55 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 56 | /* route changed */ |
bb899b89 | 57 | } else if (neigh_node && curr_router) { |
39c75a51 | 58 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
59 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
60 | orig_node->orig, neigh_node->addr, | |
61 | curr_router->addr); | |
c6c8fea2 SE |
62 | } |
63 | ||
e1a5382f | 64 | if (curr_router) |
7d211efc | 65 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
66 | |
67 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
68 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
69 | neigh_node = NULL; | |
e1a5382f LL |
70 | |
71 | spin_lock_bh(&orig_node->neigh_list_lock); | |
72 | rcu_assign_pointer(orig_node->router, neigh_node); | |
73 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
74 | ||
75 | /* decrease refcount of previous best neighbor */ | |
76 | if (curr_router) | |
7d211efc | 77 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
78 | } |
79 | ||
56303d34 SE |
80 | void batadv_update_route(struct batadv_priv *bat_priv, |
81 | struct batadv_orig_node *orig_node, | |
82 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 83 | { |
56303d34 | 84 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
85 | |
86 | if (!orig_node) | |
e1a5382f LL |
87 | goto out; |
88 | ||
7d211efc | 89 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 90 | |
e1a5382f | 91 | if (router != neigh_node) |
63b01037 | 92 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
93 | |
94 | out: | |
95 | if (router) | |
7d211efc | 96 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
97 | } |
98 | ||
a4c135c5 | 99 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
100 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
101 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
102 | { |
103 | /* this neighbor is not part of our candidate list */ | |
104 | if (list_empty(&neigh_node->bonding_list)) | |
105 | goto out; | |
106 | ||
107 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 108 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 109 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
110 | atomic_dec(&orig_node->bond_candidates); |
111 | ||
112 | out: | |
113 | return; | |
114 | } | |
115 | ||
56303d34 SE |
116 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
117 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 118 | { |
56303d34 | 119 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 120 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
121 | |
122 | spin_lock_bh(&orig_node->neigh_list_lock); | |
123 | ||
124 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
125 | if (!batadv_compare_eth(orig_node->orig, |
126 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
127 | goto candidate_del; |
128 | ||
7d211efc | 129 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 130 | if (!router) |
a4c135c5 SW |
131 | goto candidate_del; |
132 | ||
a4c135c5 | 133 | /* ... and is good enough to be considered */ |
42d0b044 | 134 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
135 | goto candidate_del; |
136 | ||
9cfc7bd6 | 137 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
138 | * interface. If we do, we won't select this candidate because of |
139 | * possible interference. | |
140 | */ | |
b67bfe0d | 141 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 142 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
143 | if (tmp_neigh_node == neigh_node) |
144 | continue; | |
145 | ||
146 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
147 | * considered as candidate. |
148 | */ | |
a4c135c5 SW |
149 | if (list_empty(&tmp_neigh_node->bonding_list)) |
150 | continue; | |
151 | ||
152 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
153 | (batadv_compare_eth(neigh_node->addr, |
154 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
155 | interference_candidate = 1; |
156 | break; | |
157 | } | |
158 | } | |
159 | ||
160 | /* don't care further if it is an interference candidate */ | |
161 | if (interference_candidate) | |
162 | goto candidate_del; | |
163 | ||
164 | /* this neighbor already is part of our candidate list */ | |
165 | if (!list_empty(&neigh_node->bonding_list)) | |
166 | goto out; | |
167 | ||
44524fcd ML |
168 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
169 | goto out; | |
170 | ||
a4c135c5 | 171 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
172 | atomic_inc(&orig_node->bond_candidates); |
173 | goto out; | |
174 | ||
175 | candidate_del: | |
30d3c511 | 176 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
177 | |
178 | out: | |
179 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
180 | |
181 | if (router) | |
7d211efc | 182 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
183 | } |
184 | ||
185 | /* copy primary address for bonding */ | |
30d3c511 | 186 | void |
56303d34 SE |
187 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
188 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 189 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 190 | { |
acd34afa | 191 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
192 | return; |
193 | ||
194 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
195 | } | |
196 | ||
c6c8fea2 SE |
197 | /* checks whether the host restarted and is in the protection time. |
198 | * returns: | |
199 | * 0 if the packet is to be accepted | |
200 | * 1 if the packet is to be ignored. | |
201 | */ | |
56303d34 | 202 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 203 | unsigned long *last_reset) |
c6c8fea2 | 204 | { |
42d0b044 SE |
205 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
206 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
207 | if (!batadv_has_timed_out(*last_reset, | |
208 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 209 | return 1; |
8c7bf248 ML |
210 | |
211 | *last_reset = jiffies; | |
39c75a51 | 212 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 213 | "old packet received, start protection\n"); |
c6c8fea2 | 214 | } |
8c7bf248 | 215 | |
c6c8fea2 SE |
216 | return 0; |
217 | } | |
218 | ||
30d3c511 | 219 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 220 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 221 | int header_len) |
c6c8fea2 | 222 | { |
c6c8fea2 SE |
223 | struct ethhdr *ethhdr; |
224 | ||
225 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
226 | if (unlikely(!pskb_may_pull(skb, header_len))) |
227 | return false; | |
c6c8fea2 | 228 | |
7ed4be95 | 229 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
230 | |
231 | /* packet with broadcast indication but unicast recipient */ | |
232 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 233 | return false; |
c6c8fea2 SE |
234 | |
235 | /* packet with broadcast sender address */ | |
236 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 237 | return false; |
c6c8fea2 SE |
238 | |
239 | /* create a copy of the skb, if needed, to modify it. */ | |
240 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 241 | return false; |
c6c8fea2 SE |
242 | |
243 | /* keep skb linear */ | |
244 | if (skb_linearize(skb) < 0) | |
c3e29312 | 245 | return false; |
c6c8fea2 | 246 | |
c3e29312 | 247 | return true; |
c6c8fea2 SE |
248 | } |
249 | ||
56303d34 | 250 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 251 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 252 | { |
56303d34 SE |
253 | struct batadv_hard_iface *primary_if = NULL; |
254 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 255 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 256 | int ret = NET_RX_DROP; |
c6c8fea2 | 257 | |
96412690 | 258 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
259 | |
260 | /* add data to device queue */ | |
acd34afa | 261 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 262 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 263 | goto out; |
c6c8fea2 SE |
264 | } |
265 | ||
e5d89254 | 266 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 267 | if (!primary_if) |
44524fcd | 268 | goto out; |
c6c8fea2 SE |
269 | |
270 | /* answer echo request (ping) */ | |
271 | /* get routing information */ | |
da641193 | 272 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 273 | if (!orig_node) |
e1a5382f | 274 | goto out; |
c6c8fea2 | 275 | |
44524fcd | 276 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 277 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
278 | goto out; |
279 | ||
96412690 | 280 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
281 | |
282 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 283 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 284 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 285 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 286 | |
e91ecfc6 | 287 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 288 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 289 | |
44524fcd | 290 | out: |
32ae9b22 | 291 | if (primary_if) |
e5d89254 | 292 | batadv_hardif_free_ref(primary_if); |
44524fcd | 293 | if (orig_node) |
7d211efc | 294 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
295 | return ret; |
296 | } | |
297 | ||
56303d34 | 298 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 299 | struct sk_buff *skb) |
c6c8fea2 | 300 | { |
56303d34 SE |
301 | struct batadv_hard_iface *primary_if = NULL; |
302 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 303 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 304 | int ret = NET_RX_DROP; |
c6c8fea2 | 305 | |
96412690 | 306 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
307 | |
308 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 309 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
310 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
311 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 312 | goto out; |
c6c8fea2 SE |
313 | } |
314 | ||
e5d89254 | 315 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 316 | if (!primary_if) |
44524fcd | 317 | goto out; |
c6c8fea2 SE |
318 | |
319 | /* get routing information */ | |
da641193 | 320 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 321 | if (!orig_node) |
e1a5382f | 322 | goto out; |
c6c8fea2 | 323 | |
44524fcd | 324 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 325 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 326 | goto out; |
c6c8fea2 | 327 | |
96412690 | 328 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 329 | |
44524fcd | 330 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 331 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 332 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 333 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 334 | |
e91ecfc6 | 335 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 336 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 337 | |
44524fcd | 338 | out: |
32ae9b22 | 339 | if (primary_if) |
e5d89254 | 340 | batadv_hardif_free_ref(primary_if); |
44524fcd | 341 | if (orig_node) |
7d211efc | 342 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
343 | return ret; |
344 | } | |
345 | ||
346 | ||
56303d34 SE |
347 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
348 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 349 | { |
56303d34 | 350 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 351 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 352 | struct ethhdr *ethhdr; |
56303d34 | 353 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 354 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 355 | int ret = NET_RX_DROP; |
c6c8fea2 | 356 | |
9cfc7bd6 | 357 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
358 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
359 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
360 | |
361 | /* drop packet if it has not necessary minimum size */ | |
362 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 363 | goto out; |
c6c8fea2 | 364 | |
7ed4be95 | 365 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
366 | |
367 | /* packet with unicast indication but broadcast recipient */ | |
368 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 369 | goto out; |
c6c8fea2 SE |
370 | |
371 | /* packet with broadcast sender address */ | |
372 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 373 | goto out; |
c6c8fea2 SE |
374 | |
375 | /* not for me */ | |
fe8a93b9 | 376 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 377 | goto out; |
c6c8fea2 | 378 | |
96412690 | 379 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
380 | |
381 | /* add record route information if not full */ | |
97dbc03b SW |
382 | if ((icmp_packet->msg_type == BATADV_ECHO_REPLY || |
383 | icmp_packet->msg_type == BATADV_ECHO_REQUEST) && | |
384 | (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && | |
7e071c79 | 385 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 386 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 387 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
388 | icmp_packet->rr_cur++; |
389 | } | |
390 | ||
391 | /* packet for me */ | |
fe8a93b9 | 392 | if (batadv_is_my_mac(bat_priv, icmp_packet->dst)) |
63b01037 | 393 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
394 | |
395 | /* TTL exceeded */ | |
76543d14 | 396 | if (icmp_packet->header.ttl < 2) |
63b01037 | 397 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 398 | |
c6c8fea2 | 399 | /* get routing information */ |
da641193 | 400 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 401 | if (!orig_node) |
e1a5382f | 402 | goto out; |
c6c8fea2 | 403 | |
44524fcd | 404 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 405 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 406 | goto out; |
c6c8fea2 | 407 | |
96412690 | 408 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 409 | |
44524fcd | 410 | /* decrement ttl */ |
76543d14 | 411 | icmp_packet->header.ttl--; |
44524fcd ML |
412 | |
413 | /* route it */ | |
e91ecfc6 | 414 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 415 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 416 | |
44524fcd | 417 | out: |
44524fcd | 418 | if (orig_node) |
7d211efc | 419 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
420 | return ret; |
421 | } | |
422 | ||
55158629 LL |
423 | /* In the bonding case, send the packets in a round |
424 | * robin fashion over the remaining interfaces. | |
425 | * | |
426 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
427 | * returned router's refcount. |
428 | */ | |
56303d34 SE |
429 | static struct batadv_neigh_node * |
430 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
431 | const struct batadv_hard_iface *recv_if) | |
55158629 | 432 | { |
56303d34 SE |
433 | struct batadv_neigh_node *tmp_neigh_node; |
434 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
435 | |
436 | rcu_read_lock(); | |
437 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
438 | bonding_list) { | |
439 | if (!first_candidate) | |
440 | first_candidate = tmp_neigh_node; | |
441 | ||
442 | /* recv_if == NULL on the first node. */ | |
443 | if (tmp_neigh_node->if_incoming == recv_if) | |
444 | continue; | |
445 | ||
446 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
447 | continue; | |
448 | ||
449 | router = tmp_neigh_node; | |
450 | break; | |
451 | } | |
452 | ||
453 | /* use the first candidate if nothing was found. */ | |
454 | if (!router && first_candidate && | |
455 | atomic_inc_not_zero(&first_candidate->refcount)) | |
456 | router = first_candidate; | |
457 | ||
458 | if (!router) | |
459 | goto out; | |
460 | ||
461 | /* selected should point to the next element | |
9cfc7bd6 SE |
462 | * after the current router |
463 | */ | |
55158629 LL |
464 | spin_lock_bh(&primary_orig->neigh_list_lock); |
465 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
466 | * does not exist as rcu version |
467 | */ | |
55158629 LL |
468 | list_del_rcu(&primary_orig->bond_list); |
469 | list_add_rcu(&primary_orig->bond_list, | |
470 | &router->bonding_list); | |
471 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
472 | ||
473 | out: | |
474 | rcu_read_unlock(); | |
475 | return router; | |
476 | } | |
477 | ||
478 | /* Interface Alternating: Use the best of the | |
479 | * remaining candidates which are not using | |
480 | * this interface. | |
481 | * | |
9cfc7bd6 SE |
482 | * Increases the returned router's refcount |
483 | */ | |
56303d34 SE |
484 | static struct batadv_neigh_node * |
485 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
486 | const struct batadv_hard_iface *recv_if) | |
55158629 | 487 | { |
56303d34 SE |
488 | struct batadv_neigh_node *tmp_neigh_node; |
489 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
490 | |
491 | rcu_read_lock(); | |
492 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
493 | bonding_list) { | |
494 | if (!first_candidate) | |
495 | first_candidate = tmp_neigh_node; | |
496 | ||
497 | /* recv_if == NULL on the first node. */ | |
498 | if (tmp_neigh_node->if_incoming == recv_if) | |
499 | continue; | |
500 | ||
fe3f4cfe SE |
501 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
502 | continue; | |
503 | ||
55158629 LL |
504 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
505 | continue; | |
506 | ||
fe3f4cfe SE |
507 | /* decrement refcount of previously selected router */ |
508 | if (router) | |
509 | batadv_neigh_node_free_ref(router); | |
55158629 | 510 | |
fe3f4cfe SE |
511 | /* we found a better router (or at least one valid router) */ |
512 | router = tmp_neigh_node; | |
55158629 LL |
513 | } |
514 | ||
515 | /* use the first candidate if nothing was found. */ | |
516 | if (!router && first_candidate && | |
517 | atomic_inc_not_zero(&first_candidate->refcount)) | |
518 | router = first_candidate; | |
519 | ||
520 | rcu_read_unlock(); | |
521 | return router; | |
522 | } | |
523 | ||
f86ce0ad MH |
524 | /** |
525 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 526 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
527 | * @skb: packet to check |
528 | * @hdr_size: size of header to pull | |
529 | * | |
530 | * Check for short header and bad addresses in given packet. Returns negative | |
531 | * value when check fails and 0 otherwise. The negative value depends on the | |
532 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
533 | * and -EREMOTE for non-local (other host) destination. | |
534 | */ | |
fe8a93b9 AQ |
535 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
536 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
537 | { |
538 | struct ethhdr *ethhdr; | |
539 | ||
540 | /* drop packet if it has not necessary minimum size */ | |
541 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 542 | return -ENODATA; |
ff51fd70 | 543 | |
7ed4be95 | 544 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
545 | |
546 | /* packet with unicast indication but broadcast recipient */ | |
547 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 548 | return -EBADR; |
ff51fd70 MH |
549 | |
550 | /* packet with broadcast sender address */ | |
551 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 552 | return -EBADR; |
ff51fd70 MH |
553 | |
554 | /* not for me */ | |
fe8a93b9 | 555 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 556 | return -EREMOTE; |
ff51fd70 MH |
557 | |
558 | return 0; | |
559 | } | |
560 | ||
c6c8fea2 | 561 | /* find a suitable router for this originator, and use |
a4c135c5 | 562 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
563 | * refcount. |
564 | */ | |
56303d34 SE |
565 | struct batadv_neigh_node * |
566 | batadv_find_router(struct batadv_priv *bat_priv, | |
567 | struct batadv_orig_node *orig_node, | |
568 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 569 | { |
56303d34 SE |
570 | struct batadv_orig_node *primary_orig_node; |
571 | struct batadv_orig_node *router_orig; | |
572 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
573 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
574 | int bonding_enabled; | |
da641193 | 575 | uint8_t *primary_addr; |
c6c8fea2 SE |
576 | |
577 | if (!orig_node) | |
578 | return NULL; | |
579 | ||
7d211efc | 580 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 581 | if (!router) |
01df2b65 | 582 | goto err; |
c6c8fea2 SE |
583 | |
584 | /* without bonding, the first node should | |
9cfc7bd6 SE |
585 | * always choose the default router. |
586 | */ | |
c6c8fea2 SE |
587 | bonding_enabled = atomic_read(&bat_priv->bonding); |
588 | ||
a4c135c5 SW |
589 | rcu_read_lock(); |
590 | /* select default router to output */ | |
e1a5382f | 591 | router_orig = router->orig_node; |
01df2b65 ML |
592 | if (!router_orig) |
593 | goto err_unlock; | |
a4c135c5 | 594 | |
a4c135c5 SW |
595 | if ((!recv_if) && (!bonding_enabled)) |
596 | goto return_router; | |
c6c8fea2 | 597 | |
da641193 SE |
598 | primary_addr = router_orig->primary_addr; |
599 | ||
c6c8fea2 | 600 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
601 | * for a potential bonding candidate. |
602 | */ | |
1eda58bf | 603 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 604 | goto return_router; |
c6c8fea2 SE |
605 | |
606 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
607 | * even be the same as our router_orig in many cases |
608 | */ | |
1eda58bf | 609 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
610 | primary_orig_node = router_orig; |
611 | } else { | |
da641193 SE |
612 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
613 | primary_addr); | |
c6c8fea2 | 614 | if (!primary_orig_node) |
a4c135c5 | 615 | goto return_router; |
7aadf889 | 616 | |
7d211efc | 617 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
618 | } |
619 | ||
620 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
621 | * bonding and prefer the original router. |
622 | */ | |
a4c135c5 SW |
623 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
624 | goto return_router; | |
c6c8fea2 | 625 | |
c6c8fea2 SE |
626 | /* all nodes between should choose a candidate which |
627 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
628 | * in. |
629 | */ | |
7d211efc | 630 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 631 | |
55158629 | 632 | if (bonding_enabled) |
63b01037 | 633 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 634 | else |
63b01037 | 635 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 636 | |
a4c135c5 | 637 | return_router: |
e9a4f295 | 638 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
639 | goto err_unlock; |
640 | ||
a4c135c5 | 641 | rcu_read_unlock(); |
c6c8fea2 | 642 | return router; |
01df2b65 ML |
643 | err_unlock: |
644 | rcu_read_unlock(); | |
645 | err: | |
646 | if (router) | |
7d211efc | 647 | batadv_neigh_node_free_ref(router); |
01df2b65 | 648 | return NULL; |
c6c8fea2 SE |
649 | } |
650 | ||
63b01037 | 651 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 652 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 653 | { |
56303d34 SE |
654 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
655 | struct batadv_orig_node *orig_node = NULL; | |
656 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 657 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 658 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 659 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 SE |
660 | struct sk_buff *new_skb; |
661 | ||
96412690 | 662 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
663 | |
664 | /* TTL exceeded */ | |
76543d14 | 665 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
666 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
667 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 668 | goto out; |
c6c8fea2 SE |
669 | } |
670 | ||
671 | /* get routing information */ | |
da641193 | 672 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 673 | |
44524fcd | 674 | if (!orig_node) |
b5a6f69c | 675 | goto out; |
c6c8fea2 | 676 | |
a4c135c5 | 677 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 678 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 679 | |
d0072609 | 680 | if (!neigh_node) |
44524fcd | 681 | goto out; |
c6c8fea2 SE |
682 | |
683 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 684 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 685 | goto out; |
c6c8fea2 | 686 | |
96412690 | 687 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 688 | |
acd34afa | 689 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 690 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 691 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
692 | ret = batadv_frag_send_skb(skb, bat_priv, |
693 | neigh_node->if_incoming, | |
694 | neigh_node->addr); | |
d0072609 ML |
695 | goto out; |
696 | } | |
c6c8fea2 | 697 | |
acd34afa | 698 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
699 | batadv_frag_can_reassemble(skb, |
700 | neigh_node->if_incoming->net_dev->mtu)) { | |
88ed1e77 | 701 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
702 | |
703 | if (ret == NET_RX_DROP) | |
44524fcd | 704 | goto out; |
c6c8fea2 SE |
705 | |
706 | /* packet was buffered for late merge */ | |
44524fcd ML |
707 | if (!new_skb) { |
708 | ret = NET_RX_SUCCESS; | |
709 | goto out; | |
710 | } | |
c6c8fea2 SE |
711 | |
712 | skb = new_skb; | |
96412690 | 713 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
714 | } |
715 | ||
716 | /* decrement ttl */ | |
76543d14 | 717 | unicast_packet->header.ttl--; |
c6c8fea2 | 718 | |
c54f38c9 SW |
719 | switch (unicast_packet->header.packet_type) { |
720 | case BATADV_UNICAST_4ADDR: | |
721 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
722 | break; | |
723 | case BATADV_UNICAST: | |
724 | hdr_len = sizeof(struct batadv_unicast_packet); | |
725 | break; | |
726 | default: | |
727 | /* other packet types not supported - yet */ | |
728 | hdr_len = -1; | |
729 | break; | |
730 | } | |
731 | ||
732 | if (hdr_len > 0) | |
733 | batadv_skb_set_priority(skb, hdr_len); | |
734 | ||
e91ecfc6 | 735 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 736 | |
e91ecfc6 MH |
737 | /* translate transmit result into receive result */ |
738 | if (res == NET_XMIT_SUCCESS) { | |
739 | /* skb was transmitted and consumed */ | |
95332477 MH |
740 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
741 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
742 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
743 | |
744 | ret = NET_RX_SUCCESS; | |
745 | } else if (res == NET_XMIT_POLICED) { | |
746 | /* skb was buffered and consumed */ | |
747 | ret = NET_RX_SUCCESS; | |
95332477 | 748 | } |
c6c8fea2 | 749 | |
44524fcd ML |
750 | out: |
751 | if (neigh_node) | |
7d211efc | 752 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 753 | if (orig_node) |
7d211efc | 754 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 755 | return ret; |
c6c8fea2 SE |
756 | } |
757 | ||
7c1fd91d AQ |
758 | /** |
759 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
760 | * @bat_priv: the bat priv with all the soft interface information | |
761 | * @unicast_packet: the unicast header to be updated | |
762 | * @dst_addr: the payload destination | |
763 | * | |
764 | * Search the translation table for dst_addr and update the unicast header with | |
765 | * the new corresponding information (originator address where the destination | |
766 | * client currently is and its known TTVN) | |
767 | * | |
768 | * Returns true if the packet header has been updated, false otherwise | |
769 | */ | |
770 | static bool | |
771 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
772 | struct batadv_unicast_packet *unicast_packet, | |
773 | uint8_t *dst_addr) | |
774 | { | |
775 | struct batadv_orig_node *orig_node = NULL; | |
776 | struct batadv_hard_iface *primary_if = NULL; | |
777 | bool ret = false; | |
778 | uint8_t *orig_addr, orig_ttvn; | |
779 | ||
780 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
781 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
782 | if (!primary_if) | |
783 | goto out; | |
784 | orig_addr = primary_if->net_dev->dev_addr; | |
785 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
786 | } else { | |
787 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
788 | if (!orig_node) | |
789 | goto out; | |
790 | ||
791 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
792 | goto out; | |
793 | ||
794 | orig_addr = orig_node->orig; | |
795 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
796 | } | |
797 | ||
798 | /* update the packet header */ | |
799 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
800 | unicast_packet->ttvn = orig_ttvn; | |
801 | ||
802 | ret = true; | |
803 | out: | |
804 | if (primary_if) | |
805 | batadv_hardif_free_ref(primary_if); | |
806 | if (orig_node) | |
807 | batadv_orig_node_free_ref(orig_node); | |
808 | ||
809 | return ret; | |
810 | } | |
811 | ||
56303d34 | 812 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 813 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 814 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 815 | struct batadv_orig_node *orig_node; |
a73105b8 | 816 | struct ethhdr *ethhdr; |
56303d34 | 817 | struct batadv_hard_iface *primary_if; |
96412690 | 818 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 819 | int is_old_ttvn; |
a73105b8 | 820 | |
b8fcfa42 | 821 | /* check if there is enough data before accessing it */ |
dd981ab0 | 822 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
823 | return 0; |
824 | ||
825 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
826 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
827 | return 0; |
828 | ||
96412690 | 829 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 830 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 831 | |
7c1fd91d AQ |
832 | /* check if the destination client was served by this node and it is now |
833 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
834 | * message and that it knows the new destination in the mesh to re-route | |
835 | * the packet to | |
836 | */ | |
837 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
838 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
839 | ethhdr->h_dest)) | |
840 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
841 | bat_priv, | |
842 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
843 | unicast_packet->dest, | |
844 | ethhdr->h_dest); | |
845 | /* at this point the mesh destination should have been | |
846 | * substituted with the originator address found in the global | |
847 | * table. If not, let the packet go untouched anyway because | |
848 | * there is nothing the node can do | |
849 | */ | |
850 | return 1; | |
851 | } | |
852 | ||
853 | /* retrieve the TTVN known by this node for the packet destination. This | |
854 | * value is used later to check if the node which sent (or re-routed | |
855 | * last time) the packet had an updated information or not | |
856 | */ | |
857 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 858 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
859 | orig_node = batadv_orig_hash_find(bat_priv, |
860 | unicast_packet->dest); | |
7c1fd91d AQ |
861 | /* if it is not possible to find the orig_node representing the |
862 | * destination, the packet can immediately be dropped as it will | |
863 | * not be possible to deliver it | |
864 | */ | |
a73105b8 AQ |
865 | if (!orig_node) |
866 | return 0; | |
867 | ||
868 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 869 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
870 | } |
871 | ||
7c1fd91d AQ |
872 | /* check if the TTVN contained in the packet is fresher than what the |
873 | * node knows | |
874 | */ | |
3e34819e | 875 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
876 | if (!is_old_ttvn) |
877 | return 1; | |
a73105b8 | 878 | |
7c1fd91d AQ |
879 | old_ttvn = unicast_packet->ttvn; |
880 | /* the packet was forged based on outdated network information. Its | |
881 | * destination can possibly be updated and forwarded towards the new | |
882 | * target host | |
883 | */ | |
884 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
885 | ethhdr->h_dest)) { | |
886 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
887 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
888 | unicast_packet->dest, ethhdr->h_dest, | |
889 | old_ttvn, curr_ttvn); | |
890 | return 1; | |
891 | } | |
3275e7cc | 892 | |
7c1fd91d AQ |
893 | /* the packet has not been re-routed: either the destination is |
894 | * currently served by this node or there is no destination at all and | |
895 | * it is possible to drop the packet | |
896 | */ | |
897 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
898 | return 0; | |
3275e7cc | 899 | |
7c1fd91d AQ |
900 | /* update the header in order to let the packet be delivered to this |
901 | * node's soft interface | |
902 | */ | |
903 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
904 | if (!primary_if) | |
905 | return 0; | |
a73105b8 | 906 | |
7c1fd91d AQ |
907 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
908 | ||
909 | batadv_hardif_free_ref(primary_if); | |
910 | ||
911 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 912 | |
a73105b8 AQ |
913 | return 1; |
914 | } | |
915 | ||
a1f1ac5c SW |
916 | /** |
917 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
918 | * are in the unicast number space but not yet known to the implementation | |
919 | * @skb: unicast tvlv packet to process | |
920 | * @recv_if: pointer to interface this packet was received on | |
921 | * | |
922 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
923 | * otherwise. | |
924 | */ | |
925 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
926 | struct batadv_hard_iface *recv_if) | |
927 | { | |
928 | struct batadv_unicast_packet *unicast_packet; | |
929 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
930 | int check, hdr_size = sizeof(*unicast_packet); | |
931 | ||
932 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
933 | if (check < 0) | |
934 | return NET_RX_DROP; | |
935 | ||
936 | /* we don't know about this type, drop it. */ | |
937 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
938 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
939 | return NET_RX_DROP; | |
940 | ||
941 | return batadv_route_unicast_packet(skb, recv_if); | |
942 | } | |
943 | ||
56303d34 SE |
944 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
945 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 946 | { |
56303d34 | 947 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 948 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 949 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
950 | uint8_t *orig_addr; |
951 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 952 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 953 | bool is4addr; |
c6c8fea2 | 954 | |
7cdcf6dd | 955 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 956 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 957 | |
c384ea3e | 958 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 959 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 960 | if (is4addr) |
4046b24a | 961 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 962 | |
612d2b4f | 963 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 964 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
965 | |
966 | /* Even though the packet is not for us, we might save it to use for | |
967 | * decoding a later received coded packet | |
968 | */ | |
969 | if (check == -EREMOTE) | |
970 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
971 | ||
972 | if (check < 0) | |
c6c8fea2 | 973 | return NET_RX_DROP; |
dd981ab0 | 974 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
975 | return NET_RX_DROP; |
976 | ||
c6c8fea2 | 977 | /* packet for me */ |
fe8a93b9 | 978 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 979 | if (is4addr) { |
4046b24a MH |
980 | batadv_dat_inc_counter(bat_priv, |
981 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
982 | orig_addr = unicast_4addr_packet->src; |
983 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
984 | } | |
4046b24a | 985 | |
c384ea3e AQ |
986 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
987 | hdr_size)) | |
988 | goto rx_success; | |
989 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
990 | hdr_size)) | |
991 | goto rx_success; | |
992 | ||
37135173 | 993 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 994 | orig_node); |
37135173 | 995 | |
c384ea3e | 996 | rx_success: |
9affec6b AQ |
997 | if (orig_node) |
998 | batadv_orig_node_free_ref(orig_node); | |
999 | ||
c6c8fea2 SE |
1000 | return NET_RX_SUCCESS; |
1001 | } | |
1002 | ||
63b01037 | 1003 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1004 | } |
1005 | ||
30d3c511 | 1006 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1007 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1008 | { |
56303d34 | 1009 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1010 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1011 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1012 | struct sk_buff *new_skb = NULL; |
1013 | int ret; | |
1014 | ||
fe8a93b9 | 1015 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) |
c6c8fea2 SE |
1016 | return NET_RX_DROP; |
1017 | ||
dd981ab0 | 1018 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
1019 | return NET_RX_DROP; |
1020 | ||
96412690 | 1021 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1022 | |
1023 | /* packet for me */ | |
fe8a93b9 | 1024 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
88ed1e77 | 1025 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1026 | |
1027 | if (ret == NET_RX_DROP) | |
1028 | return NET_RX_DROP; | |
1029 | ||
1030 | /* packet was buffered for late merge */ | |
1031 | if (!new_skb) | |
1032 | return NET_RX_SUCCESS; | |
1033 | ||
c384ea3e AQ |
1034 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb, |
1035 | hdr_size)) | |
1036 | goto rx_success; | |
1037 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb, | |
1038 | hdr_size)) | |
1039 | goto rx_success; | |
1040 | ||
04b482a2 | 1041 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
37135173 | 1042 | sizeof(struct batadv_unicast_packet), NULL); |
c384ea3e AQ |
1043 | |
1044 | rx_success: | |
c6c8fea2 SE |
1045 | return NET_RX_SUCCESS; |
1046 | } | |
1047 | ||
63b01037 | 1048 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1049 | } |
1050 | ||
ef261577 ML |
1051 | /** |
1052 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
1053 | * @skb: unicast tvlv packet to process | |
1054 | * @recv_if: pointer to interface this packet was received on | |
1055 | * @dst_addr: the payload destination | |
1056 | * | |
1057 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1058 | * otherwise. | |
1059 | */ | |
1060 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
1061 | struct batadv_hard_iface *recv_if) | |
1062 | { | |
1063 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1064 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1065 | unsigned char *tvlv_buff; | |
1066 | uint16_t tvlv_buff_len; | |
1067 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
1068 | int ret = NET_RX_DROP; | |
1069 | ||
1070 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
1071 | return NET_RX_DROP; | |
1072 | ||
1073 | /* the header is likely to be modified while forwarding */ | |
1074 | if (skb_cow(skb, hdr_size) < 0) | |
1075 | return NET_RX_DROP; | |
1076 | ||
1077 | /* packet needs to be linearized to access the tvlv content */ | |
1078 | if (skb_linearize(skb) < 0) | |
1079 | return NET_RX_DROP; | |
1080 | ||
1081 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1082 | ||
1083 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1084 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1085 | ||
1086 | if (tvlv_buff_len > skb->len - hdr_size) | |
1087 | return NET_RX_DROP; | |
1088 | ||
1089 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1090 | unicast_tvlv_packet->src, | |
1091 | unicast_tvlv_packet->dst, | |
1092 | tvlv_buff, tvlv_buff_len); | |
1093 | ||
1094 | if (ret != NET_RX_SUCCESS) | |
1095 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1096 | ||
1097 | return ret; | |
1098 | } | |
c6c8fea2 | 1099 | |
56303d34 SE |
1100 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1101 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1102 | { |
56303d34 SE |
1103 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1104 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1105 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1106 | struct ethhdr *ethhdr; |
704509b8 | 1107 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1108 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1109 | int32_t seq_diff; |
1110 | ||
1111 | /* drop packet if it has not necessary minimum size */ | |
1112 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1113 | goto out; |
c6c8fea2 | 1114 | |
7ed4be95 | 1115 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1116 | |
1117 | /* packet with broadcast indication but unicast recipient */ | |
1118 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1119 | goto out; |
c6c8fea2 SE |
1120 | |
1121 | /* packet with broadcast sender address */ | |
1122 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1123 | goto out; |
c6c8fea2 SE |
1124 | |
1125 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1126 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1127 | goto out; |
c6c8fea2 | 1128 | |
96412690 | 1129 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1130 | |
1131 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1132 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1133 | goto out; |
c6c8fea2 | 1134 | |
76543d14 | 1135 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1136 | goto out; |
c6c8fea2 | 1137 | |
da641193 | 1138 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1139 | |
1140 | if (!orig_node) | |
b5a6f69c | 1141 | goto out; |
c6c8fea2 | 1142 | |
f3e0008f | 1143 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1144 | |
1145 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1146 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1147 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1148 | goto spin_unlock; |
c6c8fea2 SE |
1149 | |
1150 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1151 | ||
1152 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1153 | if (batadv_window_protected(bat_priv, seq_diff, |
1154 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1155 | goto spin_unlock; |
c6c8fea2 SE |
1156 | |
1157 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1158 | * if required. |
1159 | */ | |
0f5f9322 | 1160 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1161 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1162 | ||
f3e0008f | 1163 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1164 | |
fe2da6ff | 1165 | /* check whether this has been sent by another originator before */ |
004e86fc | 1166 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1167 | goto out; |
1168 | ||
c54f38c9 SW |
1169 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1170 | ||
c6c8fea2 | 1171 | /* rebroadcast packet */ |
9455e34c | 1172 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1173 | |
23721387 SW |
1174 | /* don't hand the broadcast up if it is from an originator |
1175 | * from the same backbone. | |
1176 | */ | |
08adf151 | 1177 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1178 | goto out; |
1179 | ||
c384ea3e AQ |
1180 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1181 | goto rx_success; | |
1182 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1183 | goto rx_success; | |
1184 | ||
c6c8fea2 | 1185 | /* broadcast for me */ |
37135173 AQ |
1186 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1187 | orig_node); | |
c384ea3e AQ |
1188 | |
1189 | rx_success: | |
f3e0008f ML |
1190 | ret = NET_RX_SUCCESS; |
1191 | goto out; | |
c6c8fea2 | 1192 | |
f3e0008f ML |
1193 | spin_unlock: |
1194 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1195 | out: |
1196 | if (orig_node) | |
7d211efc | 1197 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1198 | return ret; |
c6c8fea2 | 1199 | } |