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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" |
610bfc6b | 31 | #include "fragmentation.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; | |
96412690 | 656 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 657 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 658 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 659 | |
96412690 | 660 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
661 | |
662 | /* TTL exceeded */ | |
76543d14 | 663 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
664 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
665 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 666 | goto out; |
c6c8fea2 SE |
667 | } |
668 | ||
669 | /* get routing information */ | |
da641193 | 670 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 671 | |
44524fcd | 672 | if (!orig_node) |
b5a6f69c | 673 | goto out; |
c6c8fea2 | 674 | |
c6c8fea2 | 675 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 676 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 677 | goto out; |
c6c8fea2 | 678 | |
c6c8fea2 | 679 | /* decrement ttl */ |
f097e25d | 680 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 681 | unicast_packet->header.ttl--; |
c6c8fea2 | 682 | |
c54f38c9 SW |
683 | switch (unicast_packet->header.packet_type) { |
684 | case BATADV_UNICAST_4ADDR: | |
685 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
686 | break; | |
687 | case BATADV_UNICAST: | |
688 | hdr_len = sizeof(struct batadv_unicast_packet); | |
689 | break; | |
690 | default: | |
691 | /* other packet types not supported - yet */ | |
692 | hdr_len = -1; | |
693 | break; | |
694 | } | |
695 | ||
696 | if (hdr_len > 0) | |
697 | batadv_skb_set_priority(skb, hdr_len); | |
698 | ||
e91ecfc6 | 699 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 700 | |
e91ecfc6 MH |
701 | /* translate transmit result into receive result */ |
702 | if (res == NET_XMIT_SUCCESS) { | |
703 | /* skb was transmitted and consumed */ | |
95332477 MH |
704 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
705 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
706 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
707 | |
708 | ret = NET_RX_SUCCESS; | |
709 | } else if (res == NET_XMIT_POLICED) { | |
710 | /* skb was buffered and consumed */ | |
711 | ret = NET_RX_SUCCESS; | |
95332477 | 712 | } |
c6c8fea2 | 713 | |
44524fcd | 714 | out: |
44524fcd | 715 | if (orig_node) |
7d211efc | 716 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 717 | return ret; |
c6c8fea2 SE |
718 | } |
719 | ||
7c1fd91d AQ |
720 | /** |
721 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
722 | * @bat_priv: the bat priv with all the soft interface information | |
723 | * @unicast_packet: the unicast header to be updated | |
724 | * @dst_addr: the payload destination | |
725 | * | |
726 | * Search the translation table for dst_addr and update the unicast header with | |
727 | * the new corresponding information (originator address where the destination | |
728 | * client currently is and its known TTVN) | |
729 | * | |
730 | * Returns true if the packet header has been updated, false otherwise | |
731 | */ | |
732 | static bool | |
733 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
734 | struct batadv_unicast_packet *unicast_packet, | |
735 | uint8_t *dst_addr) | |
736 | { | |
737 | struct batadv_orig_node *orig_node = NULL; | |
738 | struct batadv_hard_iface *primary_if = NULL; | |
739 | bool ret = false; | |
740 | uint8_t *orig_addr, orig_ttvn; | |
741 | ||
742 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
743 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
744 | if (!primary_if) | |
745 | goto out; | |
746 | orig_addr = primary_if->net_dev->dev_addr; | |
747 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
748 | } else { | |
749 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
750 | if (!orig_node) | |
751 | goto out; | |
752 | ||
753 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
754 | goto out; | |
755 | ||
756 | orig_addr = orig_node->orig; | |
757 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
758 | } | |
759 | ||
760 | /* update the packet header */ | |
761 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
762 | unicast_packet->ttvn = orig_ttvn; | |
763 | ||
764 | ret = true; | |
765 | out: | |
766 | if (primary_if) | |
767 | batadv_hardif_free_ref(primary_if); | |
768 | if (orig_node) | |
769 | batadv_orig_node_free_ref(orig_node); | |
770 | ||
771 | return ret; | |
772 | } | |
773 | ||
56303d34 | 774 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 775 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 776 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 777 | struct batadv_orig_node *orig_node; |
a73105b8 | 778 | struct ethhdr *ethhdr; |
56303d34 | 779 | struct batadv_hard_iface *primary_if; |
96412690 | 780 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 781 | int is_old_ttvn; |
a73105b8 | 782 | |
b8fcfa42 | 783 | /* check if there is enough data before accessing it */ |
dd981ab0 | 784 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
785 | return 0; |
786 | ||
787 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
788 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
789 | return 0; |
790 | ||
96412690 | 791 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 792 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 793 | |
7c1fd91d AQ |
794 | /* check if the destination client was served by this node and it is now |
795 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
796 | * message and that it knows the new destination in the mesh to re-route | |
797 | * the packet to | |
798 | */ | |
799 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
800 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
801 | ethhdr->h_dest)) | |
802 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
803 | bat_priv, | |
804 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
805 | unicast_packet->dest, | |
806 | ethhdr->h_dest); | |
807 | /* at this point the mesh destination should have been | |
808 | * substituted with the originator address found in the global | |
809 | * table. If not, let the packet go untouched anyway because | |
810 | * there is nothing the node can do | |
811 | */ | |
812 | return 1; | |
813 | } | |
814 | ||
815 | /* retrieve the TTVN known by this node for the packet destination. This | |
816 | * value is used later to check if the node which sent (or re-routed | |
817 | * last time) the packet had an updated information or not | |
818 | */ | |
819 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 820 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
821 | orig_node = batadv_orig_hash_find(bat_priv, |
822 | unicast_packet->dest); | |
7c1fd91d AQ |
823 | /* if it is not possible to find the orig_node representing the |
824 | * destination, the packet can immediately be dropped as it will | |
825 | * not be possible to deliver it | |
826 | */ | |
a73105b8 AQ |
827 | if (!orig_node) |
828 | return 0; | |
829 | ||
830 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 831 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
832 | } |
833 | ||
7c1fd91d AQ |
834 | /* check if the TTVN contained in the packet is fresher than what the |
835 | * node knows | |
836 | */ | |
3e34819e | 837 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
838 | if (!is_old_ttvn) |
839 | return 1; | |
a73105b8 | 840 | |
7c1fd91d AQ |
841 | old_ttvn = unicast_packet->ttvn; |
842 | /* the packet was forged based on outdated network information. Its | |
843 | * destination can possibly be updated and forwarded towards the new | |
844 | * target host | |
845 | */ | |
846 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
847 | ethhdr->h_dest)) { | |
848 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
849 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
850 | unicast_packet->dest, ethhdr->h_dest, | |
851 | old_ttvn, curr_ttvn); | |
852 | return 1; | |
853 | } | |
3275e7cc | 854 | |
7c1fd91d AQ |
855 | /* the packet has not been re-routed: either the destination is |
856 | * currently served by this node or there is no destination at all and | |
857 | * it is possible to drop the packet | |
858 | */ | |
859 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
860 | return 0; | |
3275e7cc | 861 | |
7c1fd91d AQ |
862 | /* update the header in order to let the packet be delivered to this |
863 | * node's soft interface | |
864 | */ | |
865 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
866 | if (!primary_if) | |
867 | return 0; | |
a73105b8 | 868 | |
7c1fd91d AQ |
869 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
870 | ||
871 | batadv_hardif_free_ref(primary_if); | |
872 | ||
873 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 874 | |
a73105b8 AQ |
875 | return 1; |
876 | } | |
877 | ||
a1f1ac5c SW |
878 | /** |
879 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
880 | * are in the unicast number space but not yet known to the implementation | |
881 | * @skb: unicast tvlv packet to process | |
882 | * @recv_if: pointer to interface this packet was received on | |
883 | * | |
884 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
885 | * otherwise. | |
886 | */ | |
887 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
888 | struct batadv_hard_iface *recv_if) | |
889 | { | |
890 | struct batadv_unicast_packet *unicast_packet; | |
891 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
892 | int check, hdr_size = sizeof(*unicast_packet); | |
893 | ||
894 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
895 | if (check < 0) | |
896 | return NET_RX_DROP; | |
897 | ||
898 | /* we don't know about this type, drop it. */ | |
899 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
900 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
901 | return NET_RX_DROP; | |
902 | ||
903 | return batadv_route_unicast_packet(skb, recv_if); | |
904 | } | |
905 | ||
56303d34 SE |
906 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
907 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 908 | { |
56303d34 | 909 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 910 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 911 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
912 | uint8_t *orig_addr; |
913 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 914 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 915 | bool is4addr; |
c6c8fea2 | 916 | |
7cdcf6dd | 917 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 918 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 919 | |
c384ea3e | 920 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 921 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 922 | if (is4addr) |
4046b24a | 923 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 924 | |
612d2b4f | 925 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 926 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
927 | |
928 | /* Even though the packet is not for us, we might save it to use for | |
929 | * decoding a later received coded packet | |
930 | */ | |
931 | if (check == -EREMOTE) | |
932 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
933 | ||
934 | if (check < 0) | |
c6c8fea2 | 935 | return NET_RX_DROP; |
dd981ab0 | 936 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
937 | return NET_RX_DROP; |
938 | ||
c6c8fea2 | 939 | /* packet for me */ |
fe8a93b9 | 940 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 941 | if (is4addr) { |
4046b24a MH |
942 | batadv_dat_inc_counter(bat_priv, |
943 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
944 | orig_addr = unicast_4addr_packet->src; |
945 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
946 | } | |
4046b24a | 947 | |
c384ea3e AQ |
948 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
949 | hdr_size)) | |
950 | goto rx_success; | |
951 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
952 | hdr_size)) | |
953 | goto rx_success; | |
954 | ||
37135173 | 955 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 956 | orig_node); |
37135173 | 957 | |
c384ea3e | 958 | rx_success: |
9affec6b AQ |
959 | if (orig_node) |
960 | batadv_orig_node_free_ref(orig_node); | |
961 | ||
c6c8fea2 SE |
962 | return NET_RX_SUCCESS; |
963 | } | |
964 | ||
63b01037 | 965 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
966 | } |
967 | ||
ef261577 ML |
968 | /** |
969 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
970 | * @skb: unicast tvlv packet to process | |
971 | * @recv_if: pointer to interface this packet was received on | |
972 | * @dst_addr: the payload destination | |
973 | * | |
974 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
975 | * otherwise. | |
976 | */ | |
977 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
978 | struct batadv_hard_iface *recv_if) | |
979 | { | |
980 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
981 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
982 | unsigned char *tvlv_buff; | |
983 | uint16_t tvlv_buff_len; | |
984 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
985 | int ret = NET_RX_DROP; | |
986 | ||
987 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
988 | return NET_RX_DROP; | |
989 | ||
990 | /* the header is likely to be modified while forwarding */ | |
991 | if (skb_cow(skb, hdr_size) < 0) | |
992 | return NET_RX_DROP; | |
993 | ||
994 | /* packet needs to be linearized to access the tvlv content */ | |
995 | if (skb_linearize(skb) < 0) | |
996 | return NET_RX_DROP; | |
997 | ||
998 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
999 | ||
1000 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1001 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1002 | ||
1003 | if (tvlv_buff_len > skb->len - hdr_size) | |
1004 | return NET_RX_DROP; | |
1005 | ||
1006 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1007 | unicast_tvlv_packet->src, | |
1008 | unicast_tvlv_packet->dst, | |
1009 | tvlv_buff, tvlv_buff_len); | |
1010 | ||
1011 | if (ret != NET_RX_SUCCESS) | |
1012 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1013 | ||
1014 | return ret; | |
1015 | } | |
c6c8fea2 | 1016 | |
610bfc6b MH |
1017 | /** |
1018 | * batadv_recv_frag_packet - process received fragment | |
1019 | * @skb: the received fragment | |
1020 | * @recv_if: interface that the skb is received on | |
1021 | * | |
1022 | * This function does one of the three following things: 1) Forward fragment, if | |
1023 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1024 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1025 | * | |
1026 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
1027 | */ | |
1028 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1029 | struct batadv_hard_iface *recv_if) | |
1030 | { | |
1031 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1032 | struct batadv_orig_node *orig_node_src = NULL; | |
1033 | struct batadv_frag_packet *frag_packet; | |
1034 | int ret = NET_RX_DROP; | |
1035 | ||
1036 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1037 | sizeof(*frag_packet)) < 0) | |
1038 | goto out; | |
1039 | ||
1040 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1041 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1042 | if (!orig_node_src) | |
1043 | goto out; | |
1044 | ||
1045 | /* Route the fragment if it is not for us and too big to be merged. */ | |
1046 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1047 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1048 | ret = NET_RX_SUCCESS; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1053 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1054 | ||
1055 | /* Add fragment to buffer and merge if possible. */ | |
1056 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1057 | goto out; | |
1058 | ||
1059 | /* Deliver merged packet to the appropriate handler, if it was | |
1060 | * merged | |
1061 | */ | |
1062 | if (skb) | |
1063 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1064 | &recv_if->batman_adv_ptype, NULL); | |
1065 | ||
1066 | ret = NET_RX_SUCCESS; | |
1067 | ||
1068 | out: | |
1069 | if (orig_node_src) | |
1070 | batadv_orig_node_free_ref(orig_node_src); | |
1071 | ||
1072 | return ret; | |
1073 | } | |
1074 | ||
56303d34 SE |
1075 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1076 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1077 | { |
56303d34 SE |
1078 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1079 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1080 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1081 | struct ethhdr *ethhdr; |
704509b8 | 1082 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1083 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1084 | int32_t seq_diff; |
1085 | ||
1086 | /* drop packet if it has not necessary minimum size */ | |
1087 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1088 | goto out; |
c6c8fea2 | 1089 | |
7ed4be95 | 1090 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1091 | |
1092 | /* packet with broadcast indication but unicast recipient */ | |
1093 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1094 | goto out; |
c6c8fea2 SE |
1095 | |
1096 | /* packet with broadcast sender address */ | |
1097 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1098 | goto out; |
c6c8fea2 SE |
1099 | |
1100 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1101 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1102 | goto out; |
c6c8fea2 | 1103 | |
96412690 | 1104 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1105 | |
1106 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1107 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1108 | goto out; |
c6c8fea2 | 1109 | |
76543d14 | 1110 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1111 | goto out; |
c6c8fea2 | 1112 | |
da641193 | 1113 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1114 | |
1115 | if (!orig_node) | |
b5a6f69c | 1116 | goto out; |
c6c8fea2 | 1117 | |
f3e0008f | 1118 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1119 | |
1120 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1121 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1122 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1123 | goto spin_unlock; |
c6c8fea2 SE |
1124 | |
1125 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1126 | ||
1127 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1128 | if (batadv_window_protected(bat_priv, seq_diff, |
1129 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1130 | goto spin_unlock; |
c6c8fea2 SE |
1131 | |
1132 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1133 | * if required. |
1134 | */ | |
0f5f9322 | 1135 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1136 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1137 | ||
f3e0008f | 1138 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1139 | |
fe2da6ff | 1140 | /* check whether this has been sent by another originator before */ |
004e86fc | 1141 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1142 | goto out; |
1143 | ||
c54f38c9 SW |
1144 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1145 | ||
c6c8fea2 | 1146 | /* rebroadcast packet */ |
9455e34c | 1147 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1148 | |
23721387 SW |
1149 | /* don't hand the broadcast up if it is from an originator |
1150 | * from the same backbone. | |
1151 | */ | |
08adf151 | 1152 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1153 | goto out; |
1154 | ||
c384ea3e AQ |
1155 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1156 | goto rx_success; | |
1157 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1158 | goto rx_success; | |
1159 | ||
c6c8fea2 | 1160 | /* broadcast for me */ |
37135173 AQ |
1161 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1162 | orig_node); | |
c384ea3e AQ |
1163 | |
1164 | rx_success: | |
f3e0008f ML |
1165 | ret = NET_RX_SUCCESS; |
1166 | goto out; | |
c6c8fea2 | 1167 | |
f3e0008f ML |
1168 | spin_unlock: |
1169 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1170 | out: |
1171 | if (orig_node) | |
7d211efc | 1172 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1173 | return ret; |
c6c8fea2 | 1174 | } |