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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 */ | |
0bf84c16 | 261 | if (icmp_packet->icmph.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 */ | |
0bf84c16 | 272 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.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 | 281 | |
0bf84c16 AQ |
282 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
283 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
284 | ETH_ALEN); | |
285 | icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY; | |
286 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 287 | |
e91ecfc6 | 288 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 289 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 290 | |
44524fcd | 291 | out: |
32ae9b22 | 292 | if (primary_if) |
e5d89254 | 293 | batadv_hardif_free_ref(primary_if); |
44524fcd | 294 | if (orig_node) |
7d211efc | 295 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
296 | return ret; |
297 | } | |
298 | ||
56303d34 | 299 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 300 | struct sk_buff *skb) |
c6c8fea2 | 301 | { |
56303d34 SE |
302 | struct batadv_hard_iface *primary_if = NULL; |
303 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 304 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 305 | int ret = NET_RX_DROP; |
c6c8fea2 | 306 | |
96412690 | 307 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
308 | |
309 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
0bf84c16 | 310 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 311 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
0bf84c16 | 312 | icmp_packet->icmph.orig, icmp_packet->icmph.dst); |
44524fcd | 313 | goto out; |
c6c8fea2 SE |
314 | } |
315 | ||
e5d89254 | 316 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 317 | if (!primary_if) |
44524fcd | 318 | goto out; |
c6c8fea2 SE |
319 | |
320 | /* get routing information */ | |
0bf84c16 | 321 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 322 | if (!orig_node) |
e1a5382f | 323 | goto out; |
c6c8fea2 | 324 | |
44524fcd | 325 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 326 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 327 | goto out; |
c6c8fea2 | 328 | |
96412690 | 329 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 330 | |
0bf84c16 AQ |
331 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
332 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
333 | ETH_ALEN); | |
334 | icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED; | |
335 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 336 | |
e91ecfc6 | 337 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 338 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 339 | |
44524fcd | 340 | out: |
32ae9b22 | 341 | if (primary_if) |
e5d89254 | 342 | batadv_hardif_free_ref(primary_if); |
44524fcd | 343 | if (orig_node) |
7d211efc | 344 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
345 | return ret; |
346 | } | |
347 | ||
348 | ||
56303d34 SE |
349 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
350 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 351 | { |
56303d34 | 352 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 353 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 354 | struct ethhdr *ethhdr; |
56303d34 | 355 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 356 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 357 | int ret = NET_RX_DROP; |
c6c8fea2 | 358 | |
9cfc7bd6 | 359 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
360 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
361 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
362 | |
363 | /* drop packet if it has not necessary minimum size */ | |
364 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 365 | goto out; |
c6c8fea2 | 366 | |
7ed4be95 | 367 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
368 | |
369 | /* packet with unicast indication but broadcast recipient */ | |
370 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 371 | goto out; |
c6c8fea2 SE |
372 | |
373 | /* packet with broadcast sender address */ | |
374 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 375 | goto out; |
c6c8fea2 SE |
376 | |
377 | /* not for me */ | |
fe8a93b9 | 378 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 379 | goto out; |
c6c8fea2 | 380 | |
96412690 | 381 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
382 | |
383 | /* add record route information if not full */ | |
0bf84c16 AQ |
384 | if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY || |
385 | icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) && | |
97dbc03b | 386 | (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 387 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 388 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 389 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
390 | icmp_packet->rr_cur++; |
391 | } | |
392 | ||
393 | /* packet for me */ | |
0bf84c16 | 394 | if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst)) |
63b01037 | 395 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
396 | |
397 | /* TTL exceeded */ | |
0bf84c16 | 398 | if (icmp_packet->icmph.header.ttl < 2) |
63b01037 | 399 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 400 | |
c6c8fea2 | 401 | /* get routing information */ |
0bf84c16 | 402 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst); |
44524fcd | 403 | if (!orig_node) |
e1a5382f | 404 | goto out; |
c6c8fea2 | 405 | |
44524fcd | 406 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 407 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 408 | goto out; |
c6c8fea2 | 409 | |
96412690 | 410 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 411 | |
44524fcd | 412 | /* decrement ttl */ |
0bf84c16 | 413 | icmp_packet->icmph.header.ttl--; |
44524fcd ML |
414 | |
415 | /* route it */ | |
e91ecfc6 | 416 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 417 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 418 | |
44524fcd | 419 | out: |
44524fcd | 420 | if (orig_node) |
7d211efc | 421 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
422 | return ret; |
423 | } | |
424 | ||
55158629 LL |
425 | /* In the bonding case, send the packets in a round |
426 | * robin fashion over the remaining interfaces. | |
427 | * | |
428 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
429 | * returned router's refcount. |
430 | */ | |
56303d34 SE |
431 | static struct batadv_neigh_node * |
432 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
433 | const struct batadv_hard_iface *recv_if) | |
55158629 | 434 | { |
56303d34 SE |
435 | struct batadv_neigh_node *tmp_neigh_node; |
436 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
437 | |
438 | rcu_read_lock(); | |
439 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
440 | bonding_list) { | |
441 | if (!first_candidate) | |
442 | first_candidate = tmp_neigh_node; | |
443 | ||
444 | /* recv_if == NULL on the first node. */ | |
445 | if (tmp_neigh_node->if_incoming == recv_if) | |
446 | continue; | |
447 | ||
448 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
449 | continue; | |
450 | ||
451 | router = tmp_neigh_node; | |
452 | break; | |
453 | } | |
454 | ||
455 | /* use the first candidate if nothing was found. */ | |
456 | if (!router && first_candidate && | |
457 | atomic_inc_not_zero(&first_candidate->refcount)) | |
458 | router = first_candidate; | |
459 | ||
460 | if (!router) | |
461 | goto out; | |
462 | ||
463 | /* selected should point to the next element | |
9cfc7bd6 SE |
464 | * after the current router |
465 | */ | |
55158629 LL |
466 | spin_lock_bh(&primary_orig->neigh_list_lock); |
467 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
468 | * does not exist as rcu version |
469 | */ | |
55158629 LL |
470 | list_del_rcu(&primary_orig->bond_list); |
471 | list_add_rcu(&primary_orig->bond_list, | |
472 | &router->bonding_list); | |
473 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
474 | ||
475 | out: | |
476 | rcu_read_unlock(); | |
477 | return router; | |
478 | } | |
479 | ||
480 | /* Interface Alternating: Use the best of the | |
481 | * remaining candidates which are not using | |
482 | * this interface. | |
483 | * | |
9cfc7bd6 SE |
484 | * Increases the returned router's refcount |
485 | */ | |
56303d34 SE |
486 | static struct batadv_neigh_node * |
487 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
488 | const struct batadv_hard_iface *recv_if) | |
55158629 | 489 | { |
56303d34 SE |
490 | struct batadv_neigh_node *tmp_neigh_node; |
491 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
492 | |
493 | rcu_read_lock(); | |
494 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
495 | bonding_list) { | |
496 | if (!first_candidate) | |
497 | first_candidate = tmp_neigh_node; | |
498 | ||
499 | /* recv_if == NULL on the first node. */ | |
500 | if (tmp_neigh_node->if_incoming == recv_if) | |
501 | continue; | |
502 | ||
fe3f4cfe SE |
503 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
504 | continue; | |
505 | ||
55158629 LL |
506 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
507 | continue; | |
508 | ||
fe3f4cfe SE |
509 | /* decrement refcount of previously selected router */ |
510 | if (router) | |
511 | batadv_neigh_node_free_ref(router); | |
55158629 | 512 | |
fe3f4cfe SE |
513 | /* we found a better router (or at least one valid router) */ |
514 | router = tmp_neigh_node; | |
55158629 LL |
515 | } |
516 | ||
517 | /* use the first candidate if nothing was found. */ | |
518 | if (!router && first_candidate && | |
519 | atomic_inc_not_zero(&first_candidate->refcount)) | |
520 | router = first_candidate; | |
521 | ||
522 | rcu_read_unlock(); | |
523 | return router; | |
524 | } | |
525 | ||
f86ce0ad MH |
526 | /** |
527 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 528 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
529 | * @skb: packet to check |
530 | * @hdr_size: size of header to pull | |
531 | * | |
532 | * Check for short header and bad addresses in given packet. Returns negative | |
533 | * value when check fails and 0 otherwise. The negative value depends on the | |
534 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
535 | * and -EREMOTE for non-local (other host) destination. | |
536 | */ | |
fe8a93b9 AQ |
537 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
538 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
539 | { |
540 | struct ethhdr *ethhdr; | |
541 | ||
542 | /* drop packet if it has not necessary minimum size */ | |
543 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 544 | return -ENODATA; |
ff51fd70 | 545 | |
7ed4be95 | 546 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
547 | |
548 | /* packet with unicast indication but broadcast recipient */ | |
549 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 550 | return -EBADR; |
ff51fd70 MH |
551 | |
552 | /* packet with broadcast sender address */ | |
553 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 554 | return -EBADR; |
ff51fd70 MH |
555 | |
556 | /* not for me */ | |
fe8a93b9 | 557 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 558 | return -EREMOTE; |
ff51fd70 MH |
559 | |
560 | return 0; | |
561 | } | |
562 | ||
c6c8fea2 | 563 | /* find a suitable router for this originator, and use |
a4c135c5 | 564 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
565 | * refcount. |
566 | */ | |
56303d34 SE |
567 | struct batadv_neigh_node * |
568 | batadv_find_router(struct batadv_priv *bat_priv, | |
569 | struct batadv_orig_node *orig_node, | |
570 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 571 | { |
56303d34 SE |
572 | struct batadv_orig_node *primary_orig_node; |
573 | struct batadv_orig_node *router_orig; | |
574 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
575 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
576 | int bonding_enabled; | |
da641193 | 577 | uint8_t *primary_addr; |
c6c8fea2 SE |
578 | |
579 | if (!orig_node) | |
580 | return NULL; | |
581 | ||
7d211efc | 582 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 583 | if (!router) |
01df2b65 | 584 | goto err; |
c6c8fea2 SE |
585 | |
586 | /* without bonding, the first node should | |
9cfc7bd6 SE |
587 | * always choose the default router. |
588 | */ | |
c6c8fea2 SE |
589 | bonding_enabled = atomic_read(&bat_priv->bonding); |
590 | ||
a4c135c5 SW |
591 | rcu_read_lock(); |
592 | /* select default router to output */ | |
e1a5382f | 593 | router_orig = router->orig_node; |
01df2b65 ML |
594 | if (!router_orig) |
595 | goto err_unlock; | |
a4c135c5 | 596 | |
a4c135c5 SW |
597 | if ((!recv_if) && (!bonding_enabled)) |
598 | goto return_router; | |
c6c8fea2 | 599 | |
da641193 SE |
600 | primary_addr = router_orig->primary_addr; |
601 | ||
c6c8fea2 | 602 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
603 | * for a potential bonding candidate. |
604 | */ | |
1eda58bf | 605 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 606 | goto return_router; |
c6c8fea2 SE |
607 | |
608 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
609 | * even be the same as our router_orig in many cases |
610 | */ | |
1eda58bf | 611 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
612 | primary_orig_node = router_orig; |
613 | } else { | |
da641193 SE |
614 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
615 | primary_addr); | |
c6c8fea2 | 616 | if (!primary_orig_node) |
a4c135c5 | 617 | goto return_router; |
7aadf889 | 618 | |
7d211efc | 619 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
620 | } |
621 | ||
622 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
623 | * bonding and prefer the original router. |
624 | */ | |
a4c135c5 SW |
625 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
626 | goto return_router; | |
c6c8fea2 | 627 | |
c6c8fea2 SE |
628 | /* all nodes between should choose a candidate which |
629 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
630 | * in. |
631 | */ | |
7d211efc | 632 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 633 | |
55158629 | 634 | if (bonding_enabled) |
63b01037 | 635 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 636 | else |
63b01037 | 637 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 638 | |
a4c135c5 | 639 | return_router: |
e9a4f295 | 640 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
641 | goto err_unlock; |
642 | ||
a4c135c5 | 643 | rcu_read_unlock(); |
c6c8fea2 | 644 | return router; |
01df2b65 ML |
645 | err_unlock: |
646 | rcu_read_unlock(); | |
647 | err: | |
648 | if (router) | |
7d211efc | 649 | batadv_neigh_node_free_ref(router); |
01df2b65 | 650 | return NULL; |
c6c8fea2 SE |
651 | } |
652 | ||
63b01037 | 653 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 654 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 655 | { |
56303d34 SE |
656 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
657 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 658 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 659 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 660 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 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 | |
c6c8fea2 | 677 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 678 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 679 | goto out; |
c6c8fea2 | 680 | |
c6c8fea2 | 681 | /* decrement ttl */ |
f097e25d | 682 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 683 | unicast_packet->header.ttl--; |
c6c8fea2 | 684 | |
c54f38c9 SW |
685 | switch (unicast_packet->header.packet_type) { |
686 | case BATADV_UNICAST_4ADDR: | |
687 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
688 | break; | |
689 | case BATADV_UNICAST: | |
690 | hdr_len = sizeof(struct batadv_unicast_packet); | |
691 | break; | |
692 | default: | |
693 | /* other packet types not supported - yet */ | |
694 | hdr_len = -1; | |
695 | break; | |
696 | } | |
697 | ||
698 | if (hdr_len > 0) | |
699 | batadv_skb_set_priority(skb, hdr_len); | |
700 | ||
e91ecfc6 | 701 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 702 | |
e91ecfc6 MH |
703 | /* translate transmit result into receive result */ |
704 | if (res == NET_XMIT_SUCCESS) { | |
705 | /* skb was transmitted and consumed */ | |
95332477 MH |
706 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
707 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
708 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
709 | |
710 | ret = NET_RX_SUCCESS; | |
711 | } else if (res == NET_XMIT_POLICED) { | |
712 | /* skb was buffered and consumed */ | |
713 | ret = NET_RX_SUCCESS; | |
95332477 | 714 | } |
c6c8fea2 | 715 | |
44524fcd | 716 | out: |
44524fcd | 717 | if (orig_node) |
7d211efc | 718 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 719 | return ret; |
c6c8fea2 SE |
720 | } |
721 | ||
7c1fd91d AQ |
722 | /** |
723 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
724 | * @bat_priv: the bat priv with all the soft interface information | |
725 | * @unicast_packet: the unicast header to be updated | |
726 | * @dst_addr: the payload destination | |
727 | * | |
728 | * Search the translation table for dst_addr and update the unicast header with | |
729 | * the new corresponding information (originator address where the destination | |
730 | * client currently is and its known TTVN) | |
731 | * | |
732 | * Returns true if the packet header has been updated, false otherwise | |
733 | */ | |
734 | static bool | |
735 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
736 | struct batadv_unicast_packet *unicast_packet, | |
737 | uint8_t *dst_addr) | |
738 | { | |
739 | struct batadv_orig_node *orig_node = NULL; | |
740 | struct batadv_hard_iface *primary_if = NULL; | |
741 | bool ret = false; | |
742 | uint8_t *orig_addr, orig_ttvn; | |
743 | ||
744 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
745 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
746 | if (!primary_if) | |
747 | goto out; | |
748 | orig_addr = primary_if->net_dev->dev_addr; | |
749 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
750 | } else { | |
751 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
752 | if (!orig_node) | |
753 | goto out; | |
754 | ||
755 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
756 | goto out; | |
757 | ||
758 | orig_addr = orig_node->orig; | |
759 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
760 | } | |
761 | ||
762 | /* update the packet header */ | |
763 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
764 | unicast_packet->ttvn = orig_ttvn; | |
765 | ||
766 | ret = true; | |
767 | out: | |
768 | if (primary_if) | |
769 | batadv_hardif_free_ref(primary_if); | |
770 | if (orig_node) | |
771 | batadv_orig_node_free_ref(orig_node); | |
772 | ||
773 | return ret; | |
774 | } | |
775 | ||
56303d34 | 776 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 777 | struct sk_buff *skb, int hdr_len) { |
7c1fd91d | 778 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 779 | struct batadv_orig_node *orig_node; |
a73105b8 | 780 | struct ethhdr *ethhdr; |
56303d34 | 781 | struct batadv_hard_iface *primary_if; |
96412690 | 782 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 783 | int is_old_ttvn; |
a73105b8 | 784 | |
b8fcfa42 | 785 | /* check if there is enough data before accessing it */ |
dd981ab0 | 786 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
787 | return 0; |
788 | ||
789 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
790 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
791 | return 0; |
792 | ||
96412690 | 793 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
dd981ab0 | 794 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 795 | |
7c1fd91d AQ |
796 | /* check if the destination client was served by this node and it is now |
797 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
798 | * message and that it knows the new destination in the mesh to re-route | |
799 | * the packet to | |
800 | */ | |
801 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
802 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
803 | ethhdr->h_dest)) | |
804 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
805 | bat_priv, | |
806 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
807 | unicast_packet->dest, | |
808 | ethhdr->h_dest); | |
809 | /* at this point the mesh destination should have been | |
810 | * substituted with the originator address found in the global | |
811 | * table. If not, let the packet go untouched anyway because | |
812 | * there is nothing the node can do | |
813 | */ | |
814 | return 1; | |
815 | } | |
816 | ||
817 | /* retrieve the TTVN known by this node for the packet destination. This | |
818 | * value is used later to check if the node which sent (or re-routed | |
819 | * last time) the packet had an updated information or not | |
820 | */ | |
821 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 822 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
823 | orig_node = batadv_orig_hash_find(bat_priv, |
824 | unicast_packet->dest); | |
7c1fd91d AQ |
825 | /* if it is not possible to find the orig_node representing the |
826 | * destination, the packet can immediately be dropped as it will | |
827 | * not be possible to deliver it | |
828 | */ | |
a73105b8 AQ |
829 | if (!orig_node) |
830 | return 0; | |
831 | ||
832 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 833 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
834 | } |
835 | ||
7c1fd91d AQ |
836 | /* check if the TTVN contained in the packet is fresher than what the |
837 | * node knows | |
838 | */ | |
3e34819e | 839 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
840 | if (!is_old_ttvn) |
841 | return 1; | |
a73105b8 | 842 | |
7c1fd91d AQ |
843 | old_ttvn = unicast_packet->ttvn; |
844 | /* the packet was forged based on outdated network information. Its | |
845 | * destination can possibly be updated and forwarded towards the new | |
846 | * target host | |
847 | */ | |
848 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
849 | ethhdr->h_dest)) { | |
850 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
851 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
852 | unicast_packet->dest, ethhdr->h_dest, | |
853 | old_ttvn, curr_ttvn); | |
854 | return 1; | |
855 | } | |
3275e7cc | 856 | |
7c1fd91d AQ |
857 | /* the packet has not been re-routed: either the destination is |
858 | * currently served by this node or there is no destination at all and | |
859 | * it is possible to drop the packet | |
860 | */ | |
861 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
862 | return 0; | |
3275e7cc | 863 | |
7c1fd91d AQ |
864 | /* update the header in order to let the packet be delivered to this |
865 | * node's soft interface | |
866 | */ | |
867 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
868 | if (!primary_if) | |
869 | return 0; | |
a73105b8 | 870 | |
7c1fd91d AQ |
871 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
872 | ||
873 | batadv_hardif_free_ref(primary_if); | |
874 | ||
875 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 876 | |
a73105b8 AQ |
877 | return 1; |
878 | } | |
879 | ||
a1f1ac5c SW |
880 | /** |
881 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
882 | * are in the unicast number space but not yet known to the implementation | |
883 | * @skb: unicast tvlv packet to process | |
884 | * @recv_if: pointer to interface this packet was received on | |
885 | * | |
886 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
887 | * otherwise. | |
888 | */ | |
889 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
890 | struct batadv_hard_iface *recv_if) | |
891 | { | |
892 | struct batadv_unicast_packet *unicast_packet; | |
893 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
894 | int check, hdr_size = sizeof(*unicast_packet); | |
895 | ||
896 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
897 | if (check < 0) | |
898 | return NET_RX_DROP; | |
899 | ||
900 | /* we don't know about this type, drop it. */ | |
901 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
902 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
903 | return NET_RX_DROP; | |
904 | ||
905 | return batadv_route_unicast_packet(skb, recv_if); | |
906 | } | |
907 | ||
56303d34 SE |
908 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
909 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 910 | { |
56303d34 | 911 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 912 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 913 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
914 | uint8_t *orig_addr; |
915 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 916 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 917 | bool is4addr; |
c6c8fea2 | 918 | |
7cdcf6dd | 919 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 920 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 921 | |
c384ea3e | 922 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 923 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 924 | if (is4addr) |
4046b24a | 925 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 926 | |
612d2b4f | 927 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 928 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
929 | |
930 | /* Even though the packet is not for us, we might save it to use for | |
931 | * decoding a later received coded packet | |
932 | */ | |
933 | if (check == -EREMOTE) | |
934 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
935 | ||
936 | if (check < 0) | |
c6c8fea2 | 937 | return NET_RX_DROP; |
dd981ab0 | 938 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
939 | return NET_RX_DROP; |
940 | ||
c6c8fea2 | 941 | /* packet for me */ |
fe8a93b9 | 942 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 943 | if (is4addr) { |
4046b24a MH |
944 | batadv_dat_inc_counter(bat_priv, |
945 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
946 | orig_addr = unicast_4addr_packet->src; |
947 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
948 | } | |
4046b24a | 949 | |
c384ea3e AQ |
950 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
951 | hdr_size)) | |
952 | goto rx_success; | |
953 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
954 | hdr_size)) | |
955 | goto rx_success; | |
956 | ||
37135173 | 957 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 958 | orig_node); |
37135173 | 959 | |
c384ea3e | 960 | rx_success: |
9affec6b AQ |
961 | if (orig_node) |
962 | batadv_orig_node_free_ref(orig_node); | |
963 | ||
c6c8fea2 SE |
964 | return NET_RX_SUCCESS; |
965 | } | |
966 | ||
63b01037 | 967 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
968 | } |
969 | ||
ef261577 ML |
970 | /** |
971 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
972 | * @skb: unicast tvlv packet to process | |
973 | * @recv_if: pointer to interface this packet was received on | |
974 | * @dst_addr: the payload destination | |
975 | * | |
976 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
977 | * otherwise. | |
978 | */ | |
979 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
980 | struct batadv_hard_iface *recv_if) | |
981 | { | |
982 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
983 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
984 | unsigned char *tvlv_buff; | |
985 | uint16_t tvlv_buff_len; | |
986 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
987 | int ret = NET_RX_DROP; | |
988 | ||
989 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
990 | return NET_RX_DROP; | |
991 | ||
992 | /* the header is likely to be modified while forwarding */ | |
993 | if (skb_cow(skb, hdr_size) < 0) | |
994 | return NET_RX_DROP; | |
995 | ||
996 | /* packet needs to be linearized to access the tvlv content */ | |
997 | if (skb_linearize(skb) < 0) | |
998 | return NET_RX_DROP; | |
999 | ||
1000 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1001 | ||
1002 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1003 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1004 | ||
1005 | if (tvlv_buff_len > skb->len - hdr_size) | |
1006 | return NET_RX_DROP; | |
1007 | ||
1008 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1009 | unicast_tvlv_packet->src, | |
1010 | unicast_tvlv_packet->dst, | |
1011 | tvlv_buff, tvlv_buff_len); | |
1012 | ||
1013 | if (ret != NET_RX_SUCCESS) | |
1014 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1015 | ||
1016 | return ret; | |
1017 | } | |
c6c8fea2 | 1018 | |
610bfc6b MH |
1019 | /** |
1020 | * batadv_recv_frag_packet - process received fragment | |
1021 | * @skb: the received fragment | |
1022 | * @recv_if: interface that the skb is received on | |
1023 | * | |
1024 | * This function does one of the three following things: 1) Forward fragment, if | |
1025 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1026 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1027 | * | |
1028 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
1029 | */ | |
1030 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1031 | struct batadv_hard_iface *recv_if) | |
1032 | { | |
1033 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1034 | struct batadv_orig_node *orig_node_src = NULL; | |
1035 | struct batadv_frag_packet *frag_packet; | |
1036 | int ret = NET_RX_DROP; | |
1037 | ||
1038 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1039 | sizeof(*frag_packet)) < 0) | |
1040 | goto out; | |
1041 | ||
1042 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1043 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1044 | if (!orig_node_src) | |
1045 | goto out; | |
1046 | ||
1047 | /* Route the fragment if it is not for us and too big to be merged. */ | |
1048 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1049 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1050 | ret = NET_RX_SUCCESS; | |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1055 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1056 | ||
1057 | /* Add fragment to buffer and merge if possible. */ | |
1058 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1059 | goto out; | |
1060 | ||
1061 | /* Deliver merged packet to the appropriate handler, if it was | |
1062 | * merged | |
1063 | */ | |
1064 | if (skb) | |
1065 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1066 | &recv_if->batman_adv_ptype, NULL); | |
1067 | ||
1068 | ret = NET_RX_SUCCESS; | |
1069 | ||
1070 | out: | |
1071 | if (orig_node_src) | |
1072 | batadv_orig_node_free_ref(orig_node_src); | |
1073 | ||
1074 | return ret; | |
1075 | } | |
1076 | ||
56303d34 SE |
1077 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1078 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1079 | { |
56303d34 SE |
1080 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1081 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1082 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1083 | struct ethhdr *ethhdr; |
704509b8 | 1084 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1085 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1086 | int32_t seq_diff; |
1087 | ||
1088 | /* drop packet if it has not necessary minimum size */ | |
1089 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1090 | goto out; |
c6c8fea2 | 1091 | |
7ed4be95 | 1092 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1093 | |
1094 | /* packet with broadcast indication but unicast recipient */ | |
1095 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1096 | goto out; |
c6c8fea2 SE |
1097 | |
1098 | /* packet with broadcast sender address */ | |
1099 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1100 | goto out; |
c6c8fea2 SE |
1101 | |
1102 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1103 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1104 | goto out; |
c6c8fea2 | 1105 | |
96412690 | 1106 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1107 | |
1108 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1109 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1110 | goto out; |
c6c8fea2 | 1111 | |
76543d14 | 1112 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1113 | goto out; |
c6c8fea2 | 1114 | |
da641193 | 1115 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1116 | |
1117 | if (!orig_node) | |
b5a6f69c | 1118 | goto out; |
c6c8fea2 | 1119 | |
f3e0008f | 1120 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1121 | |
1122 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1123 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1124 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1125 | goto spin_unlock; |
c6c8fea2 SE |
1126 | |
1127 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1128 | ||
1129 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1130 | if (batadv_window_protected(bat_priv, seq_diff, |
1131 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1132 | goto spin_unlock; |
c6c8fea2 SE |
1133 | |
1134 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1135 | * if required. |
1136 | */ | |
0f5f9322 | 1137 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1138 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1139 | ||
f3e0008f | 1140 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1141 | |
fe2da6ff | 1142 | /* check whether this has been sent by another originator before */ |
004e86fc | 1143 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1144 | goto out; |
1145 | ||
c54f38c9 SW |
1146 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1147 | ||
c6c8fea2 | 1148 | /* rebroadcast packet */ |
9455e34c | 1149 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1150 | |
23721387 SW |
1151 | /* don't hand the broadcast up if it is from an originator |
1152 | * from the same backbone. | |
1153 | */ | |
08adf151 | 1154 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1155 | goto out; |
1156 | ||
c384ea3e AQ |
1157 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1158 | goto rx_success; | |
1159 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1160 | goto rx_success; | |
1161 | ||
c6c8fea2 | 1162 | /* broadcast for me */ |
37135173 AQ |
1163 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1164 | orig_node); | |
c384ea3e AQ |
1165 | |
1166 | rx_success: | |
f3e0008f ML |
1167 | ret = NET_RX_SUCCESS; |
1168 | goto out; | |
c6c8fea2 | 1169 | |
f3e0008f ML |
1170 | spin_unlock: |
1171 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1172 | out: |
1173 | if (orig_node) | |
7d211efc | 1174 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1175 | return ret; |
c6c8fea2 | 1176 | } |