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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 | |
c018ad3d AQ |
33 | #include <linux/if_vlan.h> |
34 | ||
63b01037 | 35 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 36 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 37 | |
56303d34 SE |
38 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
39 | struct batadv_orig_node *orig_node, | |
40 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 41 | { |
56303d34 | 42 | struct batadv_neigh_node *curr_router; |
e1a5382f | 43 | |
7d211efc | 44 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 45 | |
c6c8fea2 | 46 | /* route deleted */ |
e1a5382f | 47 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
48 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
49 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
50 | batadv_tt_global_del_orig(bat_priv, orig_node, |
51 | "Deleted route towards originator"); | |
c6c8fea2 | 52 | |
e1a5382f LL |
53 | /* route added */ |
54 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 55 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
56 | "Adding route towards: %pM (via %pM)\n", |
57 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 58 | /* route changed */ |
bb899b89 | 59 | } else if (neigh_node && curr_router) { |
39c75a51 | 60 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
61 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
62 | orig_node->orig, neigh_node->addr, | |
63 | curr_router->addr); | |
c6c8fea2 SE |
64 | } |
65 | ||
e1a5382f | 66 | if (curr_router) |
7d211efc | 67 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
68 | |
69 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
70 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
71 | neigh_node = NULL; | |
e1a5382f LL |
72 | |
73 | spin_lock_bh(&orig_node->neigh_list_lock); | |
74 | rcu_assign_pointer(orig_node->router, neigh_node); | |
75 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
76 | ||
77 | /* decrease refcount of previous best neighbor */ | |
78 | if (curr_router) | |
7d211efc | 79 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
80 | } |
81 | ||
56303d34 SE |
82 | void batadv_update_route(struct batadv_priv *bat_priv, |
83 | struct batadv_orig_node *orig_node, | |
84 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 85 | { |
56303d34 | 86 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
87 | |
88 | if (!orig_node) | |
e1a5382f LL |
89 | goto out; |
90 | ||
7d211efc | 91 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 92 | |
e1a5382f | 93 | if (router != neigh_node) |
63b01037 | 94 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
95 | |
96 | out: | |
97 | if (router) | |
7d211efc | 98 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
99 | } |
100 | ||
a4c135c5 | 101 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
102 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
103 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
104 | { |
105 | /* this neighbor is not part of our candidate list */ | |
106 | if (list_empty(&neigh_node->bonding_list)) | |
107 | goto out; | |
108 | ||
109 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 110 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 111 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
112 | atomic_dec(&orig_node->bond_candidates); |
113 | ||
114 | out: | |
115 | return; | |
116 | } | |
117 | ||
56303d34 SE |
118 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
119 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 120 | { |
56303d34 | 121 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 122 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
123 | |
124 | spin_lock_bh(&orig_node->neigh_list_lock); | |
125 | ||
126 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
127 | if (!batadv_compare_eth(orig_node->orig, |
128 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
129 | goto candidate_del; |
130 | ||
7d211efc | 131 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 132 | if (!router) |
a4c135c5 SW |
133 | goto candidate_del; |
134 | ||
a4c135c5 | 135 | /* ... and is good enough to be considered */ |
42d0b044 | 136 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
137 | goto candidate_del; |
138 | ||
9cfc7bd6 | 139 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
140 | * interface. If we do, we won't select this candidate because of |
141 | * possible interference. | |
142 | */ | |
b67bfe0d | 143 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 144 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
145 | if (tmp_neigh_node == neigh_node) |
146 | continue; | |
147 | ||
148 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
149 | * considered as candidate. |
150 | */ | |
a4c135c5 SW |
151 | if (list_empty(&tmp_neigh_node->bonding_list)) |
152 | continue; | |
153 | ||
154 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
155 | (batadv_compare_eth(neigh_node->addr, |
156 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
157 | interference_candidate = 1; |
158 | break; | |
159 | } | |
160 | } | |
161 | ||
162 | /* don't care further if it is an interference candidate */ | |
163 | if (interference_candidate) | |
164 | goto candidate_del; | |
165 | ||
166 | /* this neighbor already is part of our candidate list */ | |
167 | if (!list_empty(&neigh_node->bonding_list)) | |
168 | goto out; | |
169 | ||
44524fcd ML |
170 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
171 | goto out; | |
172 | ||
a4c135c5 | 173 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
174 | atomic_inc(&orig_node->bond_candidates); |
175 | goto out; | |
176 | ||
177 | candidate_del: | |
30d3c511 | 178 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
179 | |
180 | out: | |
181 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
182 | |
183 | if (router) | |
7d211efc | 184 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
185 | } |
186 | ||
187 | /* copy primary address for bonding */ | |
30d3c511 | 188 | void |
56303d34 SE |
189 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
190 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 191 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 192 | { |
acd34afa | 193 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
194 | return; |
195 | ||
196 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
197 | } | |
198 | ||
c6c8fea2 SE |
199 | /* checks whether the host restarted and is in the protection time. |
200 | * returns: | |
201 | * 0 if the packet is to be accepted | |
202 | * 1 if the packet is to be ignored. | |
203 | */ | |
56303d34 | 204 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 205 | unsigned long *last_reset) |
c6c8fea2 | 206 | { |
42d0b044 SE |
207 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
208 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
209 | if (!batadv_has_timed_out(*last_reset, | |
210 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 211 | return 1; |
8c7bf248 ML |
212 | |
213 | *last_reset = jiffies; | |
39c75a51 | 214 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 215 | "old packet received, start protection\n"); |
c6c8fea2 | 216 | } |
8c7bf248 | 217 | |
c6c8fea2 SE |
218 | return 0; |
219 | } | |
220 | ||
30d3c511 | 221 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 222 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 223 | int header_len) |
c6c8fea2 | 224 | { |
c6c8fea2 SE |
225 | struct ethhdr *ethhdr; |
226 | ||
227 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
228 | if (unlikely(!pskb_may_pull(skb, header_len))) |
229 | return false; | |
c6c8fea2 | 230 | |
7ed4be95 | 231 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
232 | |
233 | /* packet with broadcast indication but unicast recipient */ | |
234 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 235 | return false; |
c6c8fea2 SE |
236 | |
237 | /* packet with broadcast sender address */ | |
238 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 239 | return false; |
c6c8fea2 SE |
240 | |
241 | /* create a copy of the skb, if needed, to modify it. */ | |
242 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 243 | return false; |
c6c8fea2 SE |
244 | |
245 | /* keep skb linear */ | |
246 | if (skb_linearize(skb) < 0) | |
c3e29312 | 247 | return false; |
c6c8fea2 | 248 | |
c3e29312 | 249 | return true; |
c6c8fea2 SE |
250 | } |
251 | ||
56303d34 | 252 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 253 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 254 | { |
56303d34 SE |
255 | struct batadv_hard_iface *primary_if = NULL; |
256 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 257 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 258 | int ret = NET_RX_DROP; |
c6c8fea2 | 259 | |
96412690 | 260 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
261 | |
262 | /* add data to device queue */ | |
0bf84c16 | 263 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 264 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 265 | goto out; |
c6c8fea2 SE |
266 | } |
267 | ||
e5d89254 | 268 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 269 | if (!primary_if) |
44524fcd | 270 | goto out; |
c6c8fea2 SE |
271 | |
272 | /* answer echo request (ping) */ | |
273 | /* get routing information */ | |
0bf84c16 | 274 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 275 | if (!orig_node) |
e1a5382f | 276 | goto out; |
c6c8fea2 | 277 | |
44524fcd | 278 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 279 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
280 | goto out; |
281 | ||
96412690 | 282 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd | 283 | |
0bf84c16 AQ |
284 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
285 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
286 | ETH_ALEN); | |
287 | icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY; | |
288 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 289 | |
e91ecfc6 | 290 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 291 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 292 | |
44524fcd | 293 | out: |
32ae9b22 | 294 | if (primary_if) |
e5d89254 | 295 | batadv_hardif_free_ref(primary_if); |
44524fcd | 296 | if (orig_node) |
7d211efc | 297 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
298 | return ret; |
299 | } | |
300 | ||
56303d34 | 301 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 302 | struct sk_buff *skb) |
c6c8fea2 | 303 | { |
56303d34 SE |
304 | struct batadv_hard_iface *primary_if = NULL; |
305 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 306 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 307 | int ret = NET_RX_DROP; |
c6c8fea2 | 308 | |
96412690 | 309 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
310 | |
311 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
0bf84c16 | 312 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 313 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
0bf84c16 | 314 | icmp_packet->icmph.orig, icmp_packet->icmph.dst); |
44524fcd | 315 | goto out; |
c6c8fea2 SE |
316 | } |
317 | ||
e5d89254 | 318 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 319 | if (!primary_if) |
44524fcd | 320 | goto out; |
c6c8fea2 SE |
321 | |
322 | /* get routing information */ | |
0bf84c16 | 323 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 324 | if (!orig_node) |
e1a5382f | 325 | goto out; |
c6c8fea2 | 326 | |
44524fcd | 327 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 328 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 329 | goto out; |
c6c8fea2 | 330 | |
96412690 | 331 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 332 | |
0bf84c16 AQ |
333 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
334 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
335 | ETH_ALEN); | |
336 | icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED; | |
337 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 338 | |
e91ecfc6 | 339 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 340 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 341 | |
44524fcd | 342 | out: |
32ae9b22 | 343 | if (primary_if) |
e5d89254 | 344 | batadv_hardif_free_ref(primary_if); |
44524fcd | 345 | if (orig_node) |
7d211efc | 346 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
347 | return ret; |
348 | } | |
349 | ||
350 | ||
56303d34 SE |
351 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
352 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 353 | { |
56303d34 | 354 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 355 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 356 | struct ethhdr *ethhdr; |
56303d34 | 357 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 358 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 359 | int ret = NET_RX_DROP; |
c6c8fea2 | 360 | |
9cfc7bd6 | 361 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
362 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
363 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
364 | |
365 | /* drop packet if it has not necessary minimum size */ | |
366 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 367 | goto out; |
c6c8fea2 | 368 | |
7ed4be95 | 369 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
370 | |
371 | /* packet with unicast indication but broadcast recipient */ | |
372 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 373 | goto out; |
c6c8fea2 SE |
374 | |
375 | /* packet with broadcast sender address */ | |
376 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 377 | goto out; |
c6c8fea2 SE |
378 | |
379 | /* not for me */ | |
fe8a93b9 | 380 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 381 | goto out; |
c6c8fea2 | 382 | |
96412690 | 383 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
384 | |
385 | /* add record route information if not full */ | |
0bf84c16 AQ |
386 | if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY || |
387 | icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) && | |
97dbc03b | 388 | (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 389 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 390 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 391 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
392 | icmp_packet->rr_cur++; |
393 | } | |
394 | ||
395 | /* packet for me */ | |
0bf84c16 | 396 | if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst)) |
63b01037 | 397 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
398 | |
399 | /* TTL exceeded */ | |
0bf84c16 | 400 | if (icmp_packet->icmph.header.ttl < 2) |
63b01037 | 401 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 402 | |
c6c8fea2 | 403 | /* get routing information */ |
0bf84c16 | 404 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst); |
44524fcd | 405 | if (!orig_node) |
e1a5382f | 406 | goto out; |
c6c8fea2 | 407 | |
44524fcd | 408 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 409 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 410 | goto out; |
c6c8fea2 | 411 | |
96412690 | 412 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 413 | |
44524fcd | 414 | /* decrement ttl */ |
0bf84c16 | 415 | icmp_packet->icmph.header.ttl--; |
44524fcd ML |
416 | |
417 | /* route it */ | |
e91ecfc6 | 418 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 419 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 420 | |
44524fcd | 421 | out: |
44524fcd | 422 | if (orig_node) |
7d211efc | 423 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
424 | return ret; |
425 | } | |
426 | ||
55158629 LL |
427 | /* In the bonding case, send the packets in a round |
428 | * robin fashion over the remaining interfaces. | |
429 | * | |
430 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
431 | * returned router's refcount. |
432 | */ | |
56303d34 SE |
433 | static struct batadv_neigh_node * |
434 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
435 | const struct batadv_hard_iface *recv_if) | |
55158629 | 436 | { |
56303d34 SE |
437 | struct batadv_neigh_node *tmp_neigh_node; |
438 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
439 | |
440 | rcu_read_lock(); | |
441 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
442 | bonding_list) { | |
443 | if (!first_candidate) | |
444 | first_candidate = tmp_neigh_node; | |
445 | ||
446 | /* recv_if == NULL on the first node. */ | |
447 | if (tmp_neigh_node->if_incoming == recv_if) | |
448 | continue; | |
449 | ||
450 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
451 | continue; | |
452 | ||
453 | router = tmp_neigh_node; | |
454 | break; | |
455 | } | |
456 | ||
457 | /* use the first candidate if nothing was found. */ | |
458 | if (!router && first_candidate && | |
459 | atomic_inc_not_zero(&first_candidate->refcount)) | |
460 | router = first_candidate; | |
461 | ||
462 | if (!router) | |
463 | goto out; | |
464 | ||
465 | /* selected should point to the next element | |
9cfc7bd6 SE |
466 | * after the current router |
467 | */ | |
55158629 LL |
468 | spin_lock_bh(&primary_orig->neigh_list_lock); |
469 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
470 | * does not exist as rcu version |
471 | */ | |
55158629 LL |
472 | list_del_rcu(&primary_orig->bond_list); |
473 | list_add_rcu(&primary_orig->bond_list, | |
474 | &router->bonding_list); | |
475 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
476 | ||
477 | out: | |
478 | rcu_read_unlock(); | |
479 | return router; | |
480 | } | |
481 | ||
482 | /* Interface Alternating: Use the best of the | |
483 | * remaining candidates which are not using | |
484 | * this interface. | |
485 | * | |
9cfc7bd6 SE |
486 | * Increases the returned router's refcount |
487 | */ | |
56303d34 SE |
488 | static struct batadv_neigh_node * |
489 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
490 | const struct batadv_hard_iface *recv_if) | |
55158629 | 491 | { |
56303d34 SE |
492 | struct batadv_neigh_node *tmp_neigh_node; |
493 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
494 | |
495 | rcu_read_lock(); | |
496 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
497 | bonding_list) { | |
498 | if (!first_candidate) | |
499 | first_candidate = tmp_neigh_node; | |
500 | ||
501 | /* recv_if == NULL on the first node. */ | |
502 | if (tmp_neigh_node->if_incoming == recv_if) | |
503 | continue; | |
504 | ||
fe3f4cfe SE |
505 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
506 | continue; | |
507 | ||
55158629 LL |
508 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
509 | continue; | |
510 | ||
fe3f4cfe SE |
511 | /* decrement refcount of previously selected router */ |
512 | if (router) | |
513 | batadv_neigh_node_free_ref(router); | |
55158629 | 514 | |
fe3f4cfe SE |
515 | /* we found a better router (or at least one valid router) */ |
516 | router = tmp_neigh_node; | |
55158629 LL |
517 | } |
518 | ||
519 | /* use the first candidate if nothing was found. */ | |
520 | if (!router && first_candidate && | |
521 | atomic_inc_not_zero(&first_candidate->refcount)) | |
522 | router = first_candidate; | |
523 | ||
524 | rcu_read_unlock(); | |
525 | return router; | |
526 | } | |
527 | ||
f86ce0ad MH |
528 | /** |
529 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 530 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
531 | * @skb: packet to check |
532 | * @hdr_size: size of header to pull | |
533 | * | |
534 | * Check for short header and bad addresses in given packet. Returns negative | |
535 | * value when check fails and 0 otherwise. The negative value depends on the | |
536 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
537 | * and -EREMOTE for non-local (other host) destination. | |
538 | */ | |
fe8a93b9 AQ |
539 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
540 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
541 | { |
542 | struct ethhdr *ethhdr; | |
543 | ||
544 | /* drop packet if it has not necessary minimum size */ | |
545 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 546 | return -ENODATA; |
ff51fd70 | 547 | |
7ed4be95 | 548 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
549 | |
550 | /* packet with unicast indication but broadcast recipient */ | |
551 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 552 | return -EBADR; |
ff51fd70 MH |
553 | |
554 | /* packet with broadcast sender address */ | |
555 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 556 | return -EBADR; |
ff51fd70 MH |
557 | |
558 | /* not for me */ | |
fe8a93b9 | 559 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 560 | return -EREMOTE; |
ff51fd70 MH |
561 | |
562 | return 0; | |
563 | } | |
564 | ||
c6c8fea2 | 565 | /* find a suitable router for this originator, and use |
a4c135c5 | 566 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
567 | * refcount. |
568 | */ | |
56303d34 SE |
569 | struct batadv_neigh_node * |
570 | batadv_find_router(struct batadv_priv *bat_priv, | |
571 | struct batadv_orig_node *orig_node, | |
572 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 573 | { |
56303d34 SE |
574 | struct batadv_orig_node *primary_orig_node; |
575 | struct batadv_orig_node *router_orig; | |
576 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
577 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
578 | int bonding_enabled; | |
da641193 | 579 | uint8_t *primary_addr; |
c6c8fea2 SE |
580 | |
581 | if (!orig_node) | |
582 | return NULL; | |
583 | ||
7d211efc | 584 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 585 | if (!router) |
01df2b65 | 586 | goto err; |
c6c8fea2 SE |
587 | |
588 | /* without bonding, the first node should | |
9cfc7bd6 SE |
589 | * always choose the default router. |
590 | */ | |
c6c8fea2 SE |
591 | bonding_enabled = atomic_read(&bat_priv->bonding); |
592 | ||
a4c135c5 SW |
593 | rcu_read_lock(); |
594 | /* select default router to output */ | |
e1a5382f | 595 | router_orig = router->orig_node; |
01df2b65 ML |
596 | if (!router_orig) |
597 | goto err_unlock; | |
a4c135c5 | 598 | |
a4c135c5 SW |
599 | if ((!recv_if) && (!bonding_enabled)) |
600 | goto return_router; | |
c6c8fea2 | 601 | |
da641193 SE |
602 | primary_addr = router_orig->primary_addr; |
603 | ||
c6c8fea2 | 604 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
605 | * for a potential bonding candidate. |
606 | */ | |
1eda58bf | 607 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 608 | goto return_router; |
c6c8fea2 SE |
609 | |
610 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
611 | * even be the same as our router_orig in many cases |
612 | */ | |
1eda58bf | 613 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
614 | primary_orig_node = router_orig; |
615 | } else { | |
da641193 SE |
616 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
617 | primary_addr); | |
c6c8fea2 | 618 | if (!primary_orig_node) |
a4c135c5 | 619 | goto return_router; |
7aadf889 | 620 | |
7d211efc | 621 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
622 | } |
623 | ||
624 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
625 | * bonding and prefer the original router. |
626 | */ | |
a4c135c5 SW |
627 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
628 | goto return_router; | |
c6c8fea2 | 629 | |
c6c8fea2 SE |
630 | /* all nodes between should choose a candidate which |
631 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
632 | * in. |
633 | */ | |
7d211efc | 634 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 635 | |
55158629 | 636 | if (bonding_enabled) |
63b01037 | 637 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 638 | else |
63b01037 | 639 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 640 | |
a4c135c5 | 641 | return_router: |
e9a4f295 | 642 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
643 | goto err_unlock; |
644 | ||
a4c135c5 | 645 | rcu_read_unlock(); |
c6c8fea2 | 646 | return router; |
01df2b65 ML |
647 | err_unlock: |
648 | rcu_read_unlock(); | |
649 | err: | |
650 | if (router) | |
7d211efc | 651 | batadv_neigh_node_free_ref(router); |
01df2b65 | 652 | return NULL; |
c6c8fea2 SE |
653 | } |
654 | ||
63b01037 | 655 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 656 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 657 | { |
56303d34 SE |
658 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
659 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 660 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 661 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 662 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 663 | |
96412690 | 664 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
665 | |
666 | /* TTL exceeded */ | |
76543d14 | 667 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
668 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
669 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 670 | goto out; |
c6c8fea2 SE |
671 | } |
672 | ||
673 | /* get routing information */ | |
da641193 | 674 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 675 | |
44524fcd | 676 | if (!orig_node) |
b5a6f69c | 677 | goto out; |
c6c8fea2 | 678 | |
c6c8fea2 | 679 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 680 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 681 | goto out; |
c6c8fea2 | 682 | |
c6c8fea2 | 683 | /* decrement ttl */ |
f097e25d | 684 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 685 | unicast_packet->header.ttl--; |
c6c8fea2 | 686 | |
c54f38c9 SW |
687 | switch (unicast_packet->header.packet_type) { |
688 | case BATADV_UNICAST_4ADDR: | |
689 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
690 | break; | |
691 | case BATADV_UNICAST: | |
692 | hdr_len = sizeof(struct batadv_unicast_packet); | |
693 | break; | |
694 | default: | |
695 | /* other packet types not supported - yet */ | |
696 | hdr_len = -1; | |
697 | break; | |
698 | } | |
699 | ||
700 | if (hdr_len > 0) | |
701 | batadv_skb_set_priority(skb, hdr_len); | |
702 | ||
e91ecfc6 | 703 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 704 | |
e91ecfc6 MH |
705 | /* translate transmit result into receive result */ |
706 | if (res == NET_XMIT_SUCCESS) { | |
707 | /* skb was transmitted and consumed */ | |
95332477 MH |
708 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
709 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
710 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
711 | |
712 | ret = NET_RX_SUCCESS; | |
713 | } else if (res == NET_XMIT_POLICED) { | |
714 | /* skb was buffered and consumed */ | |
715 | ret = NET_RX_SUCCESS; | |
95332477 | 716 | } |
c6c8fea2 | 717 | |
44524fcd | 718 | out: |
44524fcd | 719 | if (orig_node) |
7d211efc | 720 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 721 | return ret; |
c6c8fea2 SE |
722 | } |
723 | ||
7c1fd91d AQ |
724 | /** |
725 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
726 | * @bat_priv: the bat priv with all the soft interface information | |
727 | * @unicast_packet: the unicast header to be updated | |
728 | * @dst_addr: the payload destination | |
c018ad3d | 729 | * @vid: VLAN identifier |
7c1fd91d AQ |
730 | * |
731 | * Search the translation table for dst_addr and update the unicast header with | |
732 | * the new corresponding information (originator address where the destination | |
733 | * client currently is and its known TTVN) | |
734 | * | |
735 | * Returns true if the packet header has been updated, false otherwise | |
736 | */ | |
737 | static bool | |
738 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
739 | struct batadv_unicast_packet *unicast_packet, | |
c018ad3d | 740 | uint8_t *dst_addr, unsigned short vid) |
7c1fd91d AQ |
741 | { |
742 | struct batadv_orig_node *orig_node = NULL; | |
743 | struct batadv_hard_iface *primary_if = NULL; | |
744 | bool ret = false; | |
745 | uint8_t *orig_addr, orig_ttvn; | |
746 | ||
c018ad3d | 747 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
748 | primary_if = batadv_primary_if_get_selected(bat_priv); |
749 | if (!primary_if) | |
750 | goto out; | |
751 | orig_addr = primary_if->net_dev->dev_addr; | |
752 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
753 | } else { | |
c018ad3d AQ |
754 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
755 | vid); | |
7c1fd91d AQ |
756 | if (!orig_node) |
757 | goto out; | |
758 | ||
759 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
760 | goto out; | |
761 | ||
762 | orig_addr = orig_node->orig; | |
763 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
764 | } | |
765 | ||
766 | /* update the packet header */ | |
767 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
768 | unicast_packet->ttvn = orig_ttvn; | |
769 | ||
770 | ret = true; | |
771 | out: | |
772 | if (primary_if) | |
773 | batadv_hardif_free_ref(primary_if); | |
774 | if (orig_node) | |
775 | batadv_orig_node_free_ref(orig_node); | |
776 | ||
777 | return ret; | |
778 | } | |
779 | ||
56303d34 | 780 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 781 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
782 | struct batadv_unicast_packet *unicast_packet; |
783 | struct batadv_hard_iface *primary_if; | |
56303d34 | 784 | struct batadv_orig_node *orig_node; |
c018ad3d | 785 | uint8_t curr_ttvn, old_ttvn; |
a73105b8 | 786 | struct ethhdr *ethhdr; |
c018ad3d | 787 | unsigned short vid; |
3e34819e | 788 | int is_old_ttvn; |
a73105b8 | 789 | |
b8fcfa42 | 790 | /* check if there is enough data before accessing it */ |
dd981ab0 | 791 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
792 | return 0; |
793 | ||
794 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
795 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
796 | return 0; |
797 | ||
96412690 | 798 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 799 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 800 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 801 | |
7c1fd91d AQ |
802 | /* check if the destination client was served by this node and it is now |
803 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
804 | * message and that it knows the new destination in the mesh to re-route | |
805 | * the packet to | |
806 | */ | |
c018ad3d | 807 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 808 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 809 | ethhdr->h_dest, vid)) |
7c1fd91d AQ |
810 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, |
811 | bat_priv, | |
812 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
813 | unicast_packet->dest, | |
814 | ethhdr->h_dest); | |
815 | /* at this point the mesh destination should have been | |
816 | * substituted with the originator address found in the global | |
817 | * table. If not, let the packet go untouched anyway because | |
818 | * there is nothing the node can do | |
819 | */ | |
820 | return 1; | |
821 | } | |
822 | ||
823 | /* retrieve the TTVN known by this node for the packet destination. This | |
824 | * value is used later to check if the node which sent (or re-routed | |
825 | * last time) the packet had an updated information or not | |
826 | */ | |
827 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 828 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
829 | orig_node = batadv_orig_hash_find(bat_priv, |
830 | unicast_packet->dest); | |
7c1fd91d AQ |
831 | /* if it is not possible to find the orig_node representing the |
832 | * destination, the packet can immediately be dropped as it will | |
833 | * not be possible to deliver it | |
834 | */ | |
a73105b8 AQ |
835 | if (!orig_node) |
836 | return 0; | |
837 | ||
838 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 839 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
840 | } |
841 | ||
7c1fd91d AQ |
842 | /* check if the TTVN contained in the packet is fresher than what the |
843 | * node knows | |
844 | */ | |
3e34819e | 845 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
846 | if (!is_old_ttvn) |
847 | return 1; | |
a73105b8 | 848 | |
7c1fd91d AQ |
849 | old_ttvn = unicast_packet->ttvn; |
850 | /* the packet was forged based on outdated network information. Its | |
851 | * destination can possibly be updated and forwarded towards the new | |
852 | * target host | |
853 | */ | |
854 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 855 | ethhdr->h_dest, vid)) { |
7c1fd91d AQ |
856 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, |
857 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
858 | unicast_packet->dest, ethhdr->h_dest, | |
859 | old_ttvn, curr_ttvn); | |
860 | return 1; | |
861 | } | |
3275e7cc | 862 | |
7c1fd91d AQ |
863 | /* the packet has not been re-routed: either the destination is |
864 | * currently served by this node or there is no destination at all and | |
865 | * it is possible to drop the packet | |
866 | */ | |
c018ad3d | 867 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 868 | return 0; |
3275e7cc | 869 | |
7c1fd91d AQ |
870 | /* update the header in order to let the packet be delivered to this |
871 | * node's soft interface | |
872 | */ | |
873 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
874 | if (!primary_if) | |
875 | return 0; | |
a73105b8 | 876 | |
7c1fd91d AQ |
877 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
878 | ||
879 | batadv_hardif_free_ref(primary_if); | |
880 | ||
881 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 882 | |
a73105b8 AQ |
883 | return 1; |
884 | } | |
885 | ||
a1f1ac5c SW |
886 | /** |
887 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
888 | * are in the unicast number space but not yet known to the implementation | |
889 | * @skb: unicast tvlv packet to process | |
890 | * @recv_if: pointer to interface this packet was received on | |
891 | * | |
892 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
893 | * otherwise. | |
894 | */ | |
895 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
896 | struct batadv_hard_iface *recv_if) | |
897 | { | |
898 | struct batadv_unicast_packet *unicast_packet; | |
899 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
900 | int check, hdr_size = sizeof(*unicast_packet); | |
901 | ||
902 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
903 | if (check < 0) | |
904 | return NET_RX_DROP; | |
905 | ||
906 | /* we don't know about this type, drop it. */ | |
907 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
908 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
909 | return NET_RX_DROP; | |
910 | ||
911 | return batadv_route_unicast_packet(skb, recv_if); | |
912 | } | |
913 | ||
56303d34 SE |
914 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
915 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 916 | { |
56303d34 | 917 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 918 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 919 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
920 | uint8_t *orig_addr; |
921 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 922 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 923 | bool is4addr; |
c6c8fea2 | 924 | |
7cdcf6dd | 925 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 926 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 927 | |
c384ea3e | 928 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 929 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 930 | if (is4addr) |
4046b24a | 931 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 932 | |
612d2b4f | 933 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 934 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
935 | |
936 | /* Even though the packet is not for us, we might save it to use for | |
937 | * decoding a later received coded packet | |
938 | */ | |
939 | if (check == -EREMOTE) | |
940 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
941 | ||
942 | if (check < 0) | |
c6c8fea2 | 943 | return NET_RX_DROP; |
dd981ab0 | 944 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
945 | return NET_RX_DROP; |
946 | ||
c6c8fea2 | 947 | /* packet for me */ |
fe8a93b9 | 948 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 949 | if (is4addr) { |
4046b24a MH |
950 | batadv_dat_inc_counter(bat_priv, |
951 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
952 | orig_addr = unicast_4addr_packet->src; |
953 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
954 | } | |
4046b24a | 955 | |
c384ea3e AQ |
956 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
957 | hdr_size)) | |
958 | goto rx_success; | |
959 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
960 | hdr_size)) | |
961 | goto rx_success; | |
962 | ||
37135173 | 963 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 964 | orig_node); |
37135173 | 965 | |
c384ea3e | 966 | rx_success: |
9affec6b AQ |
967 | if (orig_node) |
968 | batadv_orig_node_free_ref(orig_node); | |
969 | ||
c6c8fea2 SE |
970 | return NET_RX_SUCCESS; |
971 | } | |
972 | ||
63b01037 | 973 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
974 | } |
975 | ||
ef261577 ML |
976 | /** |
977 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
978 | * @skb: unicast tvlv packet to process | |
979 | * @recv_if: pointer to interface this packet was received on | |
980 | * @dst_addr: the payload destination | |
981 | * | |
982 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
983 | * otherwise. | |
984 | */ | |
985 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
986 | struct batadv_hard_iface *recv_if) | |
987 | { | |
988 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
989 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
990 | unsigned char *tvlv_buff; | |
991 | uint16_t tvlv_buff_len; | |
992 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
993 | int ret = NET_RX_DROP; | |
994 | ||
995 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
996 | return NET_RX_DROP; | |
997 | ||
998 | /* the header is likely to be modified while forwarding */ | |
999 | if (skb_cow(skb, hdr_size) < 0) | |
1000 | return NET_RX_DROP; | |
1001 | ||
1002 | /* packet needs to be linearized to access the tvlv content */ | |
1003 | if (skb_linearize(skb) < 0) | |
1004 | return NET_RX_DROP; | |
1005 | ||
1006 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1007 | ||
1008 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1009 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1010 | ||
1011 | if (tvlv_buff_len > skb->len - hdr_size) | |
1012 | return NET_RX_DROP; | |
1013 | ||
1014 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1015 | unicast_tvlv_packet->src, | |
1016 | unicast_tvlv_packet->dst, | |
1017 | tvlv_buff, tvlv_buff_len); | |
1018 | ||
1019 | if (ret != NET_RX_SUCCESS) | |
1020 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1021 | ||
1022 | return ret; | |
1023 | } | |
c6c8fea2 | 1024 | |
610bfc6b MH |
1025 | /** |
1026 | * batadv_recv_frag_packet - process received fragment | |
1027 | * @skb: the received fragment | |
1028 | * @recv_if: interface that the skb is received on | |
1029 | * | |
1030 | * This function does one of the three following things: 1) Forward fragment, if | |
1031 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1032 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1033 | * | |
1034 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
1035 | */ | |
1036 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1037 | struct batadv_hard_iface *recv_if) | |
1038 | { | |
1039 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1040 | struct batadv_orig_node *orig_node_src = NULL; | |
1041 | struct batadv_frag_packet *frag_packet; | |
1042 | int ret = NET_RX_DROP; | |
1043 | ||
1044 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1045 | sizeof(*frag_packet)) < 0) | |
1046 | goto out; | |
1047 | ||
1048 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1049 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1050 | if (!orig_node_src) | |
1051 | goto out; | |
1052 | ||
1053 | /* Route the fragment if it is not for us and too big to be merged. */ | |
1054 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1055 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1056 | ret = NET_RX_SUCCESS; | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1061 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1062 | ||
1063 | /* Add fragment to buffer and merge if possible. */ | |
1064 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1065 | goto out; | |
1066 | ||
1067 | /* Deliver merged packet to the appropriate handler, if it was | |
1068 | * merged | |
1069 | */ | |
1070 | if (skb) | |
1071 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1072 | &recv_if->batman_adv_ptype, NULL); | |
1073 | ||
1074 | ret = NET_RX_SUCCESS; | |
1075 | ||
1076 | out: | |
1077 | if (orig_node_src) | |
1078 | batadv_orig_node_free_ref(orig_node_src); | |
1079 | ||
1080 | return ret; | |
1081 | } | |
1082 | ||
56303d34 SE |
1083 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1084 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1085 | { |
56303d34 SE |
1086 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1087 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1088 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1089 | struct ethhdr *ethhdr; |
704509b8 | 1090 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1091 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1092 | int32_t seq_diff; |
1093 | ||
1094 | /* drop packet if it has not necessary minimum size */ | |
1095 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1096 | goto out; |
c6c8fea2 | 1097 | |
7ed4be95 | 1098 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1099 | |
1100 | /* packet with broadcast indication but unicast recipient */ | |
1101 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1102 | goto out; |
c6c8fea2 SE |
1103 | |
1104 | /* packet with broadcast sender address */ | |
1105 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1106 | goto out; |
c6c8fea2 SE |
1107 | |
1108 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1109 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1110 | goto out; |
c6c8fea2 | 1111 | |
96412690 | 1112 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1113 | |
1114 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1115 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1116 | goto out; |
c6c8fea2 | 1117 | |
76543d14 | 1118 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1119 | goto out; |
c6c8fea2 | 1120 | |
da641193 | 1121 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1122 | |
1123 | if (!orig_node) | |
b5a6f69c | 1124 | goto out; |
c6c8fea2 | 1125 | |
f3e0008f | 1126 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1127 | |
1128 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1129 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1130 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1131 | goto spin_unlock; |
c6c8fea2 SE |
1132 | |
1133 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1134 | ||
1135 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1136 | if (batadv_window_protected(bat_priv, seq_diff, |
1137 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1138 | goto spin_unlock; |
c6c8fea2 SE |
1139 | |
1140 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1141 | * if required. |
1142 | */ | |
0f5f9322 | 1143 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1144 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1145 | ||
f3e0008f | 1146 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1147 | |
fe2da6ff | 1148 | /* check whether this has been sent by another originator before */ |
004e86fc | 1149 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1150 | goto out; |
1151 | ||
c54f38c9 SW |
1152 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1153 | ||
c6c8fea2 | 1154 | /* rebroadcast packet */ |
9455e34c | 1155 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1156 | |
23721387 SW |
1157 | /* don't hand the broadcast up if it is from an originator |
1158 | * from the same backbone. | |
1159 | */ | |
08adf151 | 1160 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1161 | goto out; |
1162 | ||
c384ea3e AQ |
1163 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1164 | goto rx_success; | |
1165 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1166 | goto rx_success; | |
1167 | ||
c6c8fea2 | 1168 | /* broadcast for me */ |
37135173 AQ |
1169 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1170 | orig_node); | |
c384ea3e AQ |
1171 | |
1172 | rx_success: | |
f3e0008f ML |
1173 | ret = NET_RX_SUCCESS; |
1174 | goto out; | |
c6c8fea2 | 1175 | |
f3e0008f ML |
1176 | spin_unlock: |
1177 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1178 | out: |
1179 | if (orig_node) | |
7d211efc | 1180 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1181 | return ret; |
c6c8fea2 | 1182 | } |