Commit | Line | Data |
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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); | |
95fb130d | 50 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 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 | ||
6680a124 AQ |
118 | /** |
119 | * batadv_bonding_candidate_add - consider a new link for bonding mode towards | |
120 | * the given originator | |
121 | * @bat_priv: the bat priv with all the soft interface information | |
122 | * @orig_node: the target node | |
123 | * @neigh_node: the neighbor representing the new link to consider for bonding | |
124 | * mode | |
125 | */ | |
126 | void batadv_bonding_candidate_add(struct batadv_priv *bat_priv, | |
127 | struct batadv_orig_node *orig_node, | |
56303d34 | 128 | struct batadv_neigh_node *neigh_node) |
a4c135c5 | 129 | { |
6680a124 | 130 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
56303d34 | 131 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
6680a124 | 132 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
133 | |
134 | spin_lock_bh(&orig_node->neigh_list_lock); | |
135 | ||
136 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
137 | if (!batadv_compare_eth(orig_node->orig, |
138 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
139 | goto candidate_del; |
140 | ||
7d211efc | 141 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 142 | if (!router) |
a4c135c5 SW |
143 | goto candidate_del; |
144 | ||
0538f759 | 145 | |
a4c135c5 | 146 | /* ... and is good enough to be considered */ |
6680a124 | 147 | if (bao->bat_neigh_is_equiv_or_better(neigh_node, router)) |
a4c135c5 SW |
148 | goto candidate_del; |
149 | ||
9cfc7bd6 | 150 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
151 | * interface. If we do, we won't select this candidate because of |
152 | * possible interference. | |
153 | */ | |
b67bfe0d | 154 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 155 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
156 | if (tmp_neigh_node == neigh_node) |
157 | continue; | |
158 | ||
159 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
160 | * considered as candidate. |
161 | */ | |
a4c135c5 SW |
162 | if (list_empty(&tmp_neigh_node->bonding_list)) |
163 | continue; | |
164 | ||
165 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
166 | (batadv_compare_eth(neigh_node->addr, |
167 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
168 | interference_candidate = 1; |
169 | break; | |
170 | } | |
171 | } | |
172 | ||
173 | /* don't care further if it is an interference candidate */ | |
174 | if (interference_candidate) | |
175 | goto candidate_del; | |
176 | ||
177 | /* this neighbor already is part of our candidate list */ | |
178 | if (!list_empty(&neigh_node->bonding_list)) | |
179 | goto out; | |
180 | ||
44524fcd ML |
181 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
182 | goto out; | |
183 | ||
a4c135c5 | 184 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
185 | atomic_inc(&orig_node->bond_candidates); |
186 | goto out; | |
187 | ||
188 | candidate_del: | |
30d3c511 | 189 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
190 | |
191 | out: | |
192 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
193 | |
194 | if (router) | |
7d211efc | 195 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
196 | } |
197 | ||
198 | /* copy primary address for bonding */ | |
30d3c511 | 199 | void |
56303d34 SE |
200 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
201 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 202 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 203 | { |
acd34afa | 204 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
205 | return; |
206 | ||
207 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
208 | } | |
209 | ||
c6c8fea2 SE |
210 | /* checks whether the host restarted and is in the protection time. |
211 | * returns: | |
212 | * 0 if the packet is to be accepted | |
213 | * 1 if the packet is to be ignored. | |
214 | */ | |
56303d34 | 215 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 216 | unsigned long *last_reset) |
c6c8fea2 | 217 | { |
42d0b044 SE |
218 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
219 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
220 | if (!batadv_has_timed_out(*last_reset, | |
221 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 222 | return 1; |
8c7bf248 ML |
223 | |
224 | *last_reset = jiffies; | |
39c75a51 | 225 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 226 | "old packet received, start protection\n"); |
c6c8fea2 | 227 | } |
8c7bf248 | 228 | |
c6c8fea2 SE |
229 | return 0; |
230 | } | |
231 | ||
30d3c511 | 232 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 233 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 234 | int header_len) |
c6c8fea2 | 235 | { |
c6c8fea2 SE |
236 | struct ethhdr *ethhdr; |
237 | ||
238 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
239 | if (unlikely(!pskb_may_pull(skb, header_len))) |
240 | return false; | |
c6c8fea2 | 241 | |
7ed4be95 | 242 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
243 | |
244 | /* packet with broadcast indication but unicast recipient */ | |
245 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 246 | return false; |
c6c8fea2 SE |
247 | |
248 | /* packet with broadcast sender address */ | |
249 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 250 | return false; |
c6c8fea2 SE |
251 | |
252 | /* create a copy of the skb, if needed, to modify it. */ | |
253 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 254 | return false; |
c6c8fea2 SE |
255 | |
256 | /* keep skb linear */ | |
257 | if (skb_linearize(skb) < 0) | |
c3e29312 | 258 | return false; |
c6c8fea2 | 259 | |
c3e29312 | 260 | return true; |
c6c8fea2 SE |
261 | } |
262 | ||
56303d34 | 263 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 264 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 265 | { |
56303d34 SE |
266 | struct batadv_hard_iface *primary_if = NULL; |
267 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 268 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 269 | int ret = NET_RX_DROP; |
c6c8fea2 | 270 | |
96412690 | 271 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
272 | |
273 | /* add data to device queue */ | |
0bf84c16 | 274 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 275 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 276 | goto out; |
c6c8fea2 SE |
277 | } |
278 | ||
e5d89254 | 279 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 280 | if (!primary_if) |
44524fcd | 281 | goto out; |
c6c8fea2 SE |
282 | |
283 | /* answer echo request (ping) */ | |
284 | /* get routing information */ | |
0bf84c16 | 285 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 286 | if (!orig_node) |
e1a5382f | 287 | goto out; |
c6c8fea2 | 288 | |
44524fcd | 289 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 290 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
291 | goto out; |
292 | ||
96412690 | 293 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd | 294 | |
0bf84c16 AQ |
295 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
296 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
297 | ETH_ALEN); | |
298 | icmp_packet->icmph.msg_type = BATADV_ECHO_REPLY; | |
299 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 300 | |
e91ecfc6 | 301 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 302 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 303 | |
44524fcd | 304 | out: |
32ae9b22 | 305 | if (primary_if) |
e5d89254 | 306 | batadv_hardif_free_ref(primary_if); |
44524fcd | 307 | if (orig_node) |
7d211efc | 308 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
309 | return ret; |
310 | } | |
311 | ||
56303d34 | 312 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 313 | struct sk_buff *skb) |
c6c8fea2 | 314 | { |
56303d34 SE |
315 | struct batadv_hard_iface *primary_if = NULL; |
316 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 317 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 318 | int ret = NET_RX_DROP; |
c6c8fea2 | 319 | |
96412690 | 320 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
321 | |
322 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
0bf84c16 | 323 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 324 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
0bf84c16 | 325 | icmp_packet->icmph.orig, icmp_packet->icmph.dst); |
44524fcd | 326 | goto out; |
c6c8fea2 SE |
327 | } |
328 | ||
e5d89254 | 329 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 330 | if (!primary_if) |
44524fcd | 331 | goto out; |
c6c8fea2 SE |
332 | |
333 | /* get routing information */ | |
0bf84c16 | 334 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 335 | if (!orig_node) |
e1a5382f | 336 | goto out; |
c6c8fea2 | 337 | |
44524fcd | 338 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 339 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 340 | goto out; |
c6c8fea2 | 341 | |
96412690 | 342 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 343 | |
0bf84c16 AQ |
344 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
345 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
346 | ETH_ALEN); | |
347 | icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED; | |
348 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 349 | |
e91ecfc6 | 350 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 351 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 352 | |
44524fcd | 353 | out: |
32ae9b22 | 354 | if (primary_if) |
e5d89254 | 355 | batadv_hardif_free_ref(primary_if); |
44524fcd | 356 | if (orig_node) |
7d211efc | 357 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
358 | return ret; |
359 | } | |
360 | ||
361 | ||
56303d34 SE |
362 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
363 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 364 | { |
56303d34 | 365 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 366 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 367 | struct ethhdr *ethhdr; |
56303d34 | 368 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 369 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 370 | int ret = NET_RX_DROP; |
c6c8fea2 | 371 | |
9cfc7bd6 | 372 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
373 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
374 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
375 | |
376 | /* drop packet if it has not necessary minimum size */ | |
377 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 378 | goto out; |
c6c8fea2 | 379 | |
7ed4be95 | 380 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
381 | |
382 | /* packet with unicast indication but broadcast recipient */ | |
383 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 384 | goto out; |
c6c8fea2 SE |
385 | |
386 | /* packet with broadcast sender address */ | |
387 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 388 | goto out; |
c6c8fea2 SE |
389 | |
390 | /* not for me */ | |
fe8a93b9 | 391 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 392 | goto out; |
c6c8fea2 | 393 | |
96412690 | 394 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
395 | |
396 | /* add record route information if not full */ | |
0bf84c16 AQ |
397 | if ((icmp_packet->icmph.msg_type == BATADV_ECHO_REPLY || |
398 | icmp_packet->icmph.msg_type == BATADV_ECHO_REQUEST) && | |
97dbc03b | 399 | (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 400 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 401 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 402 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
403 | icmp_packet->rr_cur++; |
404 | } | |
405 | ||
406 | /* packet for me */ | |
0bf84c16 | 407 | if (batadv_is_my_mac(bat_priv, icmp_packet->icmph.dst)) |
63b01037 | 408 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
409 | |
410 | /* TTL exceeded */ | |
0bf84c16 | 411 | if (icmp_packet->icmph.header.ttl < 2) |
63b01037 | 412 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 413 | |
c6c8fea2 | 414 | /* get routing information */ |
0bf84c16 | 415 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.dst); |
44524fcd | 416 | if (!orig_node) |
e1a5382f | 417 | goto out; |
c6c8fea2 | 418 | |
44524fcd | 419 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 420 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 421 | goto out; |
c6c8fea2 | 422 | |
96412690 | 423 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 424 | |
44524fcd | 425 | /* decrement ttl */ |
0bf84c16 | 426 | icmp_packet->icmph.header.ttl--; |
44524fcd ML |
427 | |
428 | /* route it */ | |
e91ecfc6 | 429 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 430 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 431 | |
44524fcd | 432 | out: |
44524fcd | 433 | if (orig_node) |
7d211efc | 434 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
435 | return ret; |
436 | } | |
437 | ||
55158629 LL |
438 | /* In the bonding case, send the packets in a round |
439 | * robin fashion over the remaining interfaces. | |
440 | * | |
441 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
442 | * returned router's refcount. |
443 | */ | |
56303d34 SE |
444 | static struct batadv_neigh_node * |
445 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
446 | const struct batadv_hard_iface *recv_if) | |
55158629 | 447 | { |
56303d34 SE |
448 | struct batadv_neigh_node *tmp_neigh_node; |
449 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
450 | |
451 | rcu_read_lock(); | |
452 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
453 | bonding_list) { | |
454 | if (!first_candidate) | |
455 | first_candidate = tmp_neigh_node; | |
456 | ||
457 | /* recv_if == NULL on the first node. */ | |
458 | if (tmp_neigh_node->if_incoming == recv_if) | |
459 | continue; | |
460 | ||
461 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
462 | continue; | |
463 | ||
464 | router = tmp_neigh_node; | |
465 | break; | |
466 | } | |
467 | ||
468 | /* use the first candidate if nothing was found. */ | |
469 | if (!router && first_candidate && | |
470 | atomic_inc_not_zero(&first_candidate->refcount)) | |
471 | router = first_candidate; | |
472 | ||
473 | if (!router) | |
474 | goto out; | |
475 | ||
476 | /* selected should point to the next element | |
9cfc7bd6 SE |
477 | * after the current router |
478 | */ | |
55158629 LL |
479 | spin_lock_bh(&primary_orig->neigh_list_lock); |
480 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
481 | * does not exist as rcu version |
482 | */ | |
55158629 LL |
483 | list_del_rcu(&primary_orig->bond_list); |
484 | list_add_rcu(&primary_orig->bond_list, | |
485 | &router->bonding_list); | |
486 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
487 | ||
488 | out: | |
489 | rcu_read_unlock(); | |
490 | return router; | |
491 | } | |
492 | ||
6680a124 AQ |
493 | /** |
494 | * batadv_find_ifalter_router - find the best of the remaining candidates which | |
495 | * are not using this interface | |
496 | * @bat_priv: the bat priv with all the soft interface information | |
497 | * @primary_orig: the destination | |
498 | * @recv_if: the interface that the router returned by this function has to not | |
499 | * use | |
55158629 | 500 | * |
6680a124 AQ |
501 | * Returns the best candidate towards primary_orig that is not using recv_if. |
502 | * Increases the returned neighbor's refcount | |
9cfc7bd6 | 503 | */ |
56303d34 | 504 | static struct batadv_neigh_node * |
6680a124 AQ |
505 | batadv_find_ifalter_router(struct batadv_priv *bat_priv, |
506 | struct batadv_orig_node *primary_orig, | |
56303d34 | 507 | const struct batadv_hard_iface *recv_if) |
55158629 | 508 | { |
56303d34 | 509 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; |
6680a124 AQ |
510 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
511 | struct batadv_neigh_node *tmp_neigh_node; | |
55158629 LL |
512 | |
513 | rcu_read_lock(); | |
514 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
515 | bonding_list) { | |
516 | if (!first_candidate) | |
517 | first_candidate = tmp_neigh_node; | |
518 | ||
519 | /* recv_if == NULL on the first node. */ | |
520 | if (tmp_neigh_node->if_incoming == recv_if) | |
521 | continue; | |
522 | ||
6680a124 | 523 | if (router && bao->bat_neigh_cmp(tmp_neigh_node, router)) |
fe3f4cfe SE |
524 | continue; |
525 | ||
55158629 LL |
526 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
527 | continue; | |
528 | ||
fe3f4cfe SE |
529 | /* decrement refcount of previously selected router */ |
530 | if (router) | |
531 | batadv_neigh_node_free_ref(router); | |
55158629 | 532 | |
fe3f4cfe SE |
533 | /* we found a better router (or at least one valid router) */ |
534 | router = tmp_neigh_node; | |
55158629 LL |
535 | } |
536 | ||
537 | /* use the first candidate if nothing was found. */ | |
538 | if (!router && first_candidate && | |
539 | atomic_inc_not_zero(&first_candidate->refcount)) | |
540 | router = first_candidate; | |
541 | ||
542 | rcu_read_unlock(); | |
543 | return router; | |
544 | } | |
545 | ||
f86ce0ad MH |
546 | /** |
547 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 548 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
549 | * @skb: packet to check |
550 | * @hdr_size: size of header to pull | |
551 | * | |
552 | * Check for short header and bad addresses in given packet. Returns negative | |
553 | * value when check fails and 0 otherwise. The negative value depends on the | |
554 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
555 | * and -EREMOTE for non-local (other host) destination. | |
556 | */ | |
fe8a93b9 AQ |
557 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
558 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
559 | { |
560 | struct ethhdr *ethhdr; | |
561 | ||
562 | /* drop packet if it has not necessary minimum size */ | |
563 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 564 | return -ENODATA; |
ff51fd70 | 565 | |
7ed4be95 | 566 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
567 | |
568 | /* packet with unicast indication but broadcast recipient */ | |
569 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 570 | return -EBADR; |
ff51fd70 MH |
571 | |
572 | /* packet with broadcast sender address */ | |
573 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 574 | return -EBADR; |
ff51fd70 MH |
575 | |
576 | /* not for me */ | |
fe8a93b9 | 577 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 578 | return -EREMOTE; |
ff51fd70 MH |
579 | |
580 | return 0; | |
581 | } | |
582 | ||
c6c8fea2 | 583 | /* find a suitable router for this originator, and use |
a4c135c5 | 584 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
585 | * refcount. |
586 | */ | |
56303d34 SE |
587 | struct batadv_neigh_node * |
588 | batadv_find_router(struct batadv_priv *bat_priv, | |
589 | struct batadv_orig_node *orig_node, | |
590 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 591 | { |
56303d34 SE |
592 | struct batadv_orig_node *primary_orig_node; |
593 | struct batadv_orig_node *router_orig; | |
594 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
595 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
596 | int bonding_enabled; | |
da641193 | 597 | uint8_t *primary_addr; |
c6c8fea2 SE |
598 | |
599 | if (!orig_node) | |
600 | return NULL; | |
601 | ||
7d211efc | 602 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 603 | if (!router) |
01df2b65 | 604 | goto err; |
c6c8fea2 SE |
605 | |
606 | /* without bonding, the first node should | |
9cfc7bd6 SE |
607 | * always choose the default router. |
608 | */ | |
c6c8fea2 SE |
609 | bonding_enabled = atomic_read(&bat_priv->bonding); |
610 | ||
a4c135c5 SW |
611 | rcu_read_lock(); |
612 | /* select default router to output */ | |
e1a5382f | 613 | router_orig = router->orig_node; |
01df2b65 ML |
614 | if (!router_orig) |
615 | goto err_unlock; | |
a4c135c5 | 616 | |
a4c135c5 SW |
617 | if ((!recv_if) && (!bonding_enabled)) |
618 | goto return_router; | |
c6c8fea2 | 619 | |
da641193 SE |
620 | primary_addr = router_orig->primary_addr; |
621 | ||
c6c8fea2 | 622 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
623 | * for a potential bonding candidate. |
624 | */ | |
1eda58bf | 625 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 626 | goto return_router; |
c6c8fea2 SE |
627 | |
628 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
629 | * even be the same as our router_orig in many cases |
630 | */ | |
1eda58bf | 631 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
632 | primary_orig_node = router_orig; |
633 | } else { | |
da641193 SE |
634 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
635 | primary_addr); | |
c6c8fea2 | 636 | if (!primary_orig_node) |
a4c135c5 | 637 | goto return_router; |
7aadf889 | 638 | |
7d211efc | 639 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
640 | } |
641 | ||
642 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
643 | * bonding and prefer the original router. |
644 | */ | |
a4c135c5 SW |
645 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
646 | goto return_router; | |
c6c8fea2 | 647 | |
c6c8fea2 SE |
648 | /* all nodes between should choose a candidate which |
649 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
650 | * in. |
651 | */ | |
7d211efc | 652 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 653 | |
55158629 | 654 | if (bonding_enabled) |
63b01037 | 655 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 656 | else |
6680a124 AQ |
657 | router = batadv_find_ifalter_router(bat_priv, primary_orig_node, |
658 | recv_if); | |
c6c8fea2 | 659 | |
a4c135c5 | 660 | return_router: |
e9a4f295 | 661 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
662 | goto err_unlock; |
663 | ||
a4c135c5 | 664 | rcu_read_unlock(); |
c6c8fea2 | 665 | return router; |
01df2b65 ML |
666 | err_unlock: |
667 | rcu_read_unlock(); | |
668 | err: | |
669 | if (router) | |
7d211efc | 670 | batadv_neigh_node_free_ref(router); |
01df2b65 | 671 | return NULL; |
c6c8fea2 SE |
672 | } |
673 | ||
63b01037 | 674 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 675 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 676 | { |
56303d34 SE |
677 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
678 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 679 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 680 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 681 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 682 | |
96412690 | 683 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
684 | |
685 | /* TTL exceeded */ | |
76543d14 | 686 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
687 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
688 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 689 | goto out; |
c6c8fea2 SE |
690 | } |
691 | ||
692 | /* get routing information */ | |
da641193 | 693 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 694 | |
44524fcd | 695 | if (!orig_node) |
b5a6f69c | 696 | goto out; |
c6c8fea2 | 697 | |
c6c8fea2 | 698 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 699 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 700 | goto out; |
c6c8fea2 | 701 | |
c6c8fea2 | 702 | /* decrement ttl */ |
f097e25d | 703 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 704 | unicast_packet->header.ttl--; |
c6c8fea2 | 705 | |
c54f38c9 SW |
706 | switch (unicast_packet->header.packet_type) { |
707 | case BATADV_UNICAST_4ADDR: | |
708 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
709 | break; | |
710 | case BATADV_UNICAST: | |
711 | hdr_len = sizeof(struct batadv_unicast_packet); | |
712 | break; | |
713 | default: | |
714 | /* other packet types not supported - yet */ | |
715 | hdr_len = -1; | |
716 | break; | |
717 | } | |
718 | ||
719 | if (hdr_len > 0) | |
720 | batadv_skb_set_priority(skb, hdr_len); | |
721 | ||
e91ecfc6 | 722 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 723 | |
e91ecfc6 MH |
724 | /* translate transmit result into receive result */ |
725 | if (res == NET_XMIT_SUCCESS) { | |
726 | /* skb was transmitted and consumed */ | |
95332477 MH |
727 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
728 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
729 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
730 | |
731 | ret = NET_RX_SUCCESS; | |
732 | } else if (res == NET_XMIT_POLICED) { | |
733 | /* skb was buffered and consumed */ | |
734 | ret = NET_RX_SUCCESS; | |
95332477 | 735 | } |
c6c8fea2 | 736 | |
44524fcd | 737 | out: |
44524fcd | 738 | if (orig_node) |
7d211efc | 739 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 740 | return ret; |
c6c8fea2 SE |
741 | } |
742 | ||
7c1fd91d AQ |
743 | /** |
744 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
745 | * @bat_priv: the bat priv with all the soft interface information | |
746 | * @unicast_packet: the unicast header to be updated | |
747 | * @dst_addr: the payload destination | |
c018ad3d | 748 | * @vid: VLAN identifier |
7c1fd91d AQ |
749 | * |
750 | * Search the translation table for dst_addr and update the unicast header with | |
751 | * the new corresponding information (originator address where the destination | |
752 | * client currently is and its known TTVN) | |
753 | * | |
754 | * Returns true if the packet header has been updated, false otherwise | |
755 | */ | |
756 | static bool | |
757 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
758 | struct batadv_unicast_packet *unicast_packet, | |
c018ad3d | 759 | uint8_t *dst_addr, unsigned short vid) |
7c1fd91d AQ |
760 | { |
761 | struct batadv_orig_node *orig_node = NULL; | |
762 | struct batadv_hard_iface *primary_if = NULL; | |
763 | bool ret = false; | |
764 | uint8_t *orig_addr, orig_ttvn; | |
765 | ||
c018ad3d | 766 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
767 | primary_if = batadv_primary_if_get_selected(bat_priv); |
768 | if (!primary_if) | |
769 | goto out; | |
770 | orig_addr = primary_if->net_dev->dev_addr; | |
771 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
772 | } else { | |
c018ad3d AQ |
773 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
774 | vid); | |
7c1fd91d AQ |
775 | if (!orig_node) |
776 | goto out; | |
777 | ||
778 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
779 | goto out; | |
780 | ||
781 | orig_addr = orig_node->orig; | |
782 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
783 | } | |
784 | ||
785 | /* update the packet header */ | |
786 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
787 | unicast_packet->ttvn = orig_ttvn; | |
788 | ||
789 | ret = true; | |
790 | out: | |
791 | if (primary_if) | |
792 | batadv_hardif_free_ref(primary_if); | |
793 | if (orig_node) | |
794 | batadv_orig_node_free_ref(orig_node); | |
795 | ||
796 | return ret; | |
797 | } | |
798 | ||
56303d34 | 799 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 800 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
801 | struct batadv_unicast_packet *unicast_packet; |
802 | struct batadv_hard_iface *primary_if; | |
56303d34 | 803 | struct batadv_orig_node *orig_node; |
c018ad3d | 804 | uint8_t curr_ttvn, old_ttvn; |
a73105b8 | 805 | struct ethhdr *ethhdr; |
c018ad3d | 806 | unsigned short vid; |
3e34819e | 807 | int is_old_ttvn; |
a73105b8 | 808 | |
b8fcfa42 | 809 | /* check if there is enough data before accessing it */ |
dd981ab0 | 810 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
811 | return 0; |
812 | ||
813 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
814 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
815 | return 0; |
816 | ||
96412690 | 817 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 818 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 819 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 820 | |
7c1fd91d AQ |
821 | /* check if the destination client was served by this node and it is now |
822 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
823 | * message and that it knows the new destination in the mesh to re-route | |
824 | * the packet to | |
825 | */ | |
c018ad3d | 826 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 827 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 828 | ethhdr->h_dest, vid)) |
7c1fd91d AQ |
829 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, |
830 | bat_priv, | |
831 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
832 | unicast_packet->dest, | |
833 | ethhdr->h_dest); | |
834 | /* at this point the mesh destination should have been | |
835 | * substituted with the originator address found in the global | |
836 | * table. If not, let the packet go untouched anyway because | |
837 | * there is nothing the node can do | |
838 | */ | |
839 | return 1; | |
840 | } | |
841 | ||
842 | /* retrieve the TTVN known by this node for the packet destination. This | |
843 | * value is used later to check if the node which sent (or re-routed | |
844 | * last time) the packet had an updated information or not | |
845 | */ | |
846 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 847 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
848 | orig_node = batadv_orig_hash_find(bat_priv, |
849 | unicast_packet->dest); | |
7c1fd91d AQ |
850 | /* if it is not possible to find the orig_node representing the |
851 | * destination, the packet can immediately be dropped as it will | |
852 | * not be possible to deliver it | |
853 | */ | |
a73105b8 AQ |
854 | if (!orig_node) |
855 | return 0; | |
856 | ||
857 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 858 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
859 | } |
860 | ||
7c1fd91d AQ |
861 | /* check if the TTVN contained in the packet is fresher than what the |
862 | * node knows | |
863 | */ | |
3e34819e | 864 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
865 | if (!is_old_ttvn) |
866 | return 1; | |
a73105b8 | 867 | |
7c1fd91d AQ |
868 | old_ttvn = unicast_packet->ttvn; |
869 | /* the packet was forged based on outdated network information. Its | |
870 | * destination can possibly be updated and forwarded towards the new | |
871 | * target host | |
872 | */ | |
873 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 874 | ethhdr->h_dest, vid)) { |
7c1fd91d AQ |
875 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, |
876 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
877 | unicast_packet->dest, ethhdr->h_dest, | |
878 | old_ttvn, curr_ttvn); | |
879 | return 1; | |
880 | } | |
3275e7cc | 881 | |
7c1fd91d AQ |
882 | /* the packet has not been re-routed: either the destination is |
883 | * currently served by this node or there is no destination at all and | |
884 | * it is possible to drop the packet | |
885 | */ | |
c018ad3d | 886 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 887 | return 0; |
3275e7cc | 888 | |
7c1fd91d AQ |
889 | /* update the header in order to let the packet be delivered to this |
890 | * node's soft interface | |
891 | */ | |
892 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
893 | if (!primary_if) | |
894 | return 0; | |
a73105b8 | 895 | |
7c1fd91d AQ |
896 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
897 | ||
898 | batadv_hardif_free_ref(primary_if); | |
899 | ||
900 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 901 | |
a73105b8 AQ |
902 | return 1; |
903 | } | |
904 | ||
a1f1ac5c SW |
905 | /** |
906 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
907 | * are in the unicast number space but not yet known to the implementation | |
908 | * @skb: unicast tvlv packet to process | |
909 | * @recv_if: pointer to interface this packet was received on | |
910 | * | |
911 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
912 | * otherwise. | |
913 | */ | |
914 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
915 | struct batadv_hard_iface *recv_if) | |
916 | { | |
917 | struct batadv_unicast_packet *unicast_packet; | |
918 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
919 | int check, hdr_size = sizeof(*unicast_packet); | |
920 | ||
921 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
922 | if (check < 0) | |
923 | return NET_RX_DROP; | |
924 | ||
925 | /* we don't know about this type, drop it. */ | |
926 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
927 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
928 | return NET_RX_DROP; | |
929 | ||
930 | return batadv_route_unicast_packet(skb, recv_if); | |
931 | } | |
932 | ||
56303d34 SE |
933 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
934 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 935 | { |
56303d34 | 936 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 937 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 938 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
939 | uint8_t *orig_addr; |
940 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 941 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 942 | bool is4addr; |
c6c8fea2 | 943 | |
7cdcf6dd | 944 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 945 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 946 | |
c384ea3e | 947 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 948 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 949 | if (is4addr) |
4046b24a | 950 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 951 | |
612d2b4f | 952 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 953 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
954 | |
955 | /* Even though the packet is not for us, we might save it to use for | |
956 | * decoding a later received coded packet | |
957 | */ | |
958 | if (check == -EREMOTE) | |
959 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
960 | ||
961 | if (check < 0) | |
c6c8fea2 | 962 | return NET_RX_DROP; |
dd981ab0 | 963 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
964 | return NET_RX_DROP; |
965 | ||
c6c8fea2 | 966 | /* packet for me */ |
fe8a93b9 | 967 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 968 | if (is4addr) { |
4046b24a MH |
969 | batadv_dat_inc_counter(bat_priv, |
970 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
971 | orig_addr = unicast_4addr_packet->src; |
972 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
973 | } | |
4046b24a | 974 | |
c384ea3e AQ |
975 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
976 | hdr_size)) | |
977 | goto rx_success; | |
978 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
979 | hdr_size)) | |
980 | goto rx_success; | |
981 | ||
37135173 | 982 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 983 | orig_node); |
37135173 | 984 | |
c384ea3e | 985 | rx_success: |
9affec6b AQ |
986 | if (orig_node) |
987 | batadv_orig_node_free_ref(orig_node); | |
988 | ||
c6c8fea2 SE |
989 | return NET_RX_SUCCESS; |
990 | } | |
991 | ||
63b01037 | 992 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
993 | } |
994 | ||
ef261577 ML |
995 | /** |
996 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
997 | * @skb: unicast tvlv packet to process | |
998 | * @recv_if: pointer to interface this packet was received on | |
999 | * @dst_addr: the payload destination | |
1000 | * | |
1001 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1002 | * otherwise. | |
1003 | */ | |
1004 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
1005 | struct batadv_hard_iface *recv_if) | |
1006 | { | |
1007 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1008 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1009 | unsigned char *tvlv_buff; | |
1010 | uint16_t tvlv_buff_len; | |
1011 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
1012 | int ret = NET_RX_DROP; | |
1013 | ||
1014 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
1015 | return NET_RX_DROP; | |
1016 | ||
1017 | /* the header is likely to be modified while forwarding */ | |
1018 | if (skb_cow(skb, hdr_size) < 0) | |
1019 | return NET_RX_DROP; | |
1020 | ||
1021 | /* packet needs to be linearized to access the tvlv content */ | |
1022 | if (skb_linearize(skb) < 0) | |
1023 | return NET_RX_DROP; | |
1024 | ||
1025 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1026 | ||
1027 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1028 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1029 | ||
1030 | if (tvlv_buff_len > skb->len - hdr_size) | |
1031 | return NET_RX_DROP; | |
1032 | ||
1033 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1034 | unicast_tvlv_packet->src, | |
1035 | unicast_tvlv_packet->dst, | |
1036 | tvlv_buff, tvlv_buff_len); | |
1037 | ||
1038 | if (ret != NET_RX_SUCCESS) | |
1039 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1040 | ||
1041 | return ret; | |
1042 | } | |
c6c8fea2 | 1043 | |
610bfc6b MH |
1044 | /** |
1045 | * batadv_recv_frag_packet - process received fragment | |
1046 | * @skb: the received fragment | |
1047 | * @recv_if: interface that the skb is received on | |
1048 | * | |
1049 | * This function does one of the three following things: 1) Forward fragment, if | |
1050 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1051 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1052 | * | |
1053 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
1054 | */ | |
1055 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1056 | struct batadv_hard_iface *recv_if) | |
1057 | { | |
1058 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1059 | struct batadv_orig_node *orig_node_src = NULL; | |
1060 | struct batadv_frag_packet *frag_packet; | |
1061 | int ret = NET_RX_DROP; | |
1062 | ||
1063 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1064 | sizeof(*frag_packet)) < 0) | |
1065 | goto out; | |
1066 | ||
1067 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1068 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1069 | if (!orig_node_src) | |
1070 | goto out; | |
1071 | ||
1072 | /* Route the fragment if it is not for us and too big to be merged. */ | |
1073 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1074 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1075 | ret = NET_RX_SUCCESS; | |
1076 | goto out; | |
1077 | } | |
1078 | ||
1079 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1080 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1081 | ||
1082 | /* Add fragment to buffer and merge if possible. */ | |
1083 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1084 | goto out; | |
1085 | ||
1086 | /* Deliver merged packet to the appropriate handler, if it was | |
1087 | * merged | |
1088 | */ | |
1089 | if (skb) | |
1090 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1091 | &recv_if->batman_adv_ptype, NULL); | |
1092 | ||
1093 | ret = NET_RX_SUCCESS; | |
1094 | ||
1095 | out: | |
1096 | if (orig_node_src) | |
1097 | batadv_orig_node_free_ref(orig_node_src); | |
1098 | ||
1099 | return ret; | |
1100 | } | |
1101 | ||
56303d34 SE |
1102 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1103 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1104 | { |
56303d34 SE |
1105 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1106 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1107 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1108 | struct ethhdr *ethhdr; |
704509b8 | 1109 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1110 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1111 | int32_t seq_diff; |
1112 | ||
1113 | /* drop packet if it has not necessary minimum size */ | |
1114 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1115 | goto out; |
c6c8fea2 | 1116 | |
7ed4be95 | 1117 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1118 | |
1119 | /* packet with broadcast indication but unicast recipient */ | |
1120 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1121 | goto out; |
c6c8fea2 SE |
1122 | |
1123 | /* packet with broadcast sender address */ | |
1124 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1125 | goto out; |
c6c8fea2 SE |
1126 | |
1127 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1128 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1129 | goto out; |
c6c8fea2 | 1130 | |
96412690 | 1131 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1132 | |
1133 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1134 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1135 | goto out; |
c6c8fea2 | 1136 | |
76543d14 | 1137 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1138 | goto out; |
c6c8fea2 | 1139 | |
da641193 | 1140 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1141 | |
1142 | if (!orig_node) | |
b5a6f69c | 1143 | goto out; |
c6c8fea2 | 1144 | |
f3e0008f | 1145 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1146 | |
1147 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1148 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1149 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1150 | goto spin_unlock; |
c6c8fea2 SE |
1151 | |
1152 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1153 | ||
1154 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1155 | if (batadv_window_protected(bat_priv, seq_diff, |
1156 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1157 | goto spin_unlock; |
c6c8fea2 SE |
1158 | |
1159 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1160 | * if required. |
1161 | */ | |
0f5f9322 | 1162 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1163 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1164 | ||
f3e0008f | 1165 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1166 | |
fe2da6ff | 1167 | /* check whether this has been sent by another originator before */ |
004e86fc | 1168 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1169 | goto out; |
1170 | ||
c54f38c9 SW |
1171 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1172 | ||
c6c8fea2 | 1173 | /* rebroadcast packet */ |
9455e34c | 1174 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1175 | |
23721387 SW |
1176 | /* don't hand the broadcast up if it is from an originator |
1177 | * from the same backbone. | |
1178 | */ | |
08adf151 | 1179 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1180 | goto out; |
1181 | ||
c384ea3e AQ |
1182 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1183 | goto rx_success; | |
1184 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1185 | goto rx_success; | |
1186 | ||
c6c8fea2 | 1187 | /* broadcast for me */ |
37135173 AQ |
1188 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1189 | orig_node); | |
c384ea3e AQ |
1190 | |
1191 | rx_success: | |
f3e0008f ML |
1192 | ret = NET_RX_SUCCESS; |
1193 | goto out; | |
c6c8fea2 | 1194 | |
f3e0008f ML |
1195 | spin_unlock: |
1196 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1197 | out: |
1198 | if (orig_node) | |
7d211efc | 1199 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1200 | return ret; |
c6c8fea2 | 1201 | } |