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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 | ||
da6b8c20 SW |
263 | /** |
264 | * batadv_recv_my_icmp_packet - receive an icmp packet locally | |
265 | * @bat_priv: the bat priv with all the soft interface information | |
266 | * @skb: icmp packet to process | |
267 | * | |
268 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
269 | * otherwise. | |
270 | */ | |
56303d34 | 271 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 272 | struct sk_buff *skb) |
c6c8fea2 | 273 | { |
56303d34 SE |
274 | struct batadv_hard_iface *primary_if = NULL; |
275 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
276 | struct batadv_icmp_header *icmph; |
277 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 278 | |
da6b8c20 | 279 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 280 | |
da6b8c20 SW |
281 | switch (icmph->msg_type) { |
282 | case BATADV_ECHO_REPLY: | |
283 | case BATADV_DESTINATION_UNREACHABLE: | |
284 | case BATADV_TTL_EXCEEDED: | |
285 | /* receive the packet */ | |
286 | if (skb_linearize(skb) < 0) | |
287 | break; | |
c6c8fea2 | 288 | |
da6b8c20 SW |
289 | batadv_socket_receive_packet(icmph, skb->len); |
290 | break; | |
291 | case BATADV_ECHO_REQUEST: | |
292 | /* answer echo request (ping) */ | |
293 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
294 | if (!primary_if) | |
295 | goto out; | |
296 | ||
297 | /* get routing information */ | |
298 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
299 | if (!orig_node) | |
300 | goto out; | |
301 | ||
302 | /* create a copy of the skb, if needed, to modify it. */ | |
303 | if (skb_cow(skb, ETH_HLEN) < 0) | |
304 | goto out; | |
305 | ||
306 | icmph = (struct batadv_icmp_header *)skb->data; | |
307 | ||
308 | memcpy(icmph->dst, icmph->orig, ETH_ALEN); | |
309 | memcpy(icmph->orig, primary_if->net_dev->dev_addr, ETH_ALEN); | |
310 | icmph->msg_type = BATADV_ECHO_REPLY; | |
311 | icmph->header.ttl = BATADV_TTL; | |
312 | ||
313 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
314 | if (res != NET_XMIT_DROP) | |
315 | ret = NET_RX_SUCCESS; | |
316 | ||
317 | break; | |
318 | default: | |
319 | /* drop unknown type */ | |
44524fcd | 320 | goto out; |
da6b8c20 | 321 | } |
44524fcd | 322 | out: |
32ae9b22 | 323 | if (primary_if) |
e5d89254 | 324 | batadv_hardif_free_ref(primary_if); |
44524fcd | 325 | if (orig_node) |
7d211efc | 326 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
327 | return ret; |
328 | } | |
329 | ||
56303d34 | 330 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 331 | struct sk_buff *skb) |
c6c8fea2 | 332 | { |
56303d34 SE |
333 | struct batadv_hard_iface *primary_if = NULL; |
334 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 335 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 336 | int ret = NET_RX_DROP; |
c6c8fea2 | 337 | |
96412690 | 338 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
339 | |
340 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
0bf84c16 | 341 | if (icmp_packet->icmph.msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 342 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
0bf84c16 | 343 | icmp_packet->icmph.orig, icmp_packet->icmph.dst); |
44524fcd | 344 | goto out; |
c6c8fea2 SE |
345 | } |
346 | ||
e5d89254 | 347 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 348 | if (!primary_if) |
44524fcd | 349 | goto out; |
c6c8fea2 SE |
350 | |
351 | /* get routing information */ | |
0bf84c16 | 352 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->icmph.orig); |
44524fcd | 353 | if (!orig_node) |
e1a5382f | 354 | goto out; |
c6c8fea2 | 355 | |
44524fcd | 356 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 357 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 358 | goto out; |
c6c8fea2 | 359 | |
96412690 | 360 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 361 | |
0bf84c16 AQ |
362 | memcpy(icmp_packet->icmph.dst, icmp_packet->icmph.orig, ETH_ALEN); |
363 | memcpy(icmp_packet->icmph.orig, primary_if->net_dev->dev_addr, | |
364 | ETH_ALEN); | |
365 | icmp_packet->icmph.msg_type = BATADV_TTL_EXCEEDED; | |
366 | icmp_packet->icmph.header.ttl = BATADV_TTL; | |
44524fcd | 367 | |
e91ecfc6 | 368 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 369 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 370 | |
44524fcd | 371 | out: |
32ae9b22 | 372 | if (primary_if) |
e5d89254 | 373 | batadv_hardif_free_ref(primary_if); |
44524fcd | 374 | if (orig_node) |
7d211efc | 375 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
376 | return ret; |
377 | } | |
378 | ||
379 | ||
56303d34 SE |
380 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
381 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 382 | { |
56303d34 | 383 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
384 | struct batadv_icmp_header *icmph; |
385 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 386 | struct ethhdr *ethhdr; |
56303d34 | 387 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 388 | int hdr_size = sizeof(struct batadv_icmp_header); |
44524fcd | 389 | int ret = NET_RX_DROP; |
c6c8fea2 | 390 | |
c6c8fea2 SE |
391 | /* drop packet if it has not necessary minimum size */ |
392 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 393 | goto out; |
c6c8fea2 | 394 | |
7ed4be95 | 395 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
396 | |
397 | /* packet with unicast indication but broadcast recipient */ | |
398 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 399 | goto out; |
c6c8fea2 SE |
400 | |
401 | /* packet with broadcast sender address */ | |
402 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 403 | goto out; |
c6c8fea2 SE |
404 | |
405 | /* not for me */ | |
fe8a93b9 | 406 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 407 | goto out; |
c6c8fea2 | 408 | |
da6b8c20 | 409 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
410 | |
411 | /* add record route information if not full */ | |
da6b8c20 SW |
412 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
413 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
414 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { | |
415 | if (skb_linearize(skb) < 0) | |
416 | goto out; | |
417 | ||
418 | /* create a copy of the skb, if needed, to modify it. */ | |
419 | if (skb_cow(skb, ETH_HLEN) < 0) | |
420 | goto out; | |
421 | ||
422 | icmph = (struct batadv_icmp_header *)skb->data; | |
423 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
424 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
425 | goto out; | |
426 | ||
427 | memcpy(&(icmp_packet_rr->rr[icmp_packet_rr->rr_cur]), | |
7c64fd98 | 428 | ethhdr->h_dest, ETH_ALEN); |
da6b8c20 | 429 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
430 | } |
431 | ||
432 | /* packet for me */ | |
da6b8c20 SW |
433 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
434 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
435 | |
436 | /* TTL exceeded */ | |
da6b8c20 | 437 | if (icmph->header.ttl < 2) |
63b01037 | 438 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 439 | |
c6c8fea2 | 440 | /* get routing information */ |
da6b8c20 | 441 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 442 | if (!orig_node) |
e1a5382f | 443 | goto out; |
c6c8fea2 | 444 | |
44524fcd | 445 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 446 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 447 | goto out; |
c6c8fea2 | 448 | |
da6b8c20 | 449 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 450 | |
44524fcd | 451 | /* decrement ttl */ |
da6b8c20 | 452 | icmph->header.ttl--; |
44524fcd ML |
453 | |
454 | /* route it */ | |
e91ecfc6 | 455 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 456 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 457 | |
44524fcd | 458 | out: |
44524fcd | 459 | if (orig_node) |
7d211efc | 460 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
461 | return ret; |
462 | } | |
463 | ||
55158629 LL |
464 | /* In the bonding case, send the packets in a round |
465 | * robin fashion over the remaining interfaces. | |
466 | * | |
467 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
468 | * returned router's refcount. |
469 | */ | |
56303d34 SE |
470 | static struct batadv_neigh_node * |
471 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
472 | const struct batadv_hard_iface *recv_if) | |
55158629 | 473 | { |
56303d34 SE |
474 | struct batadv_neigh_node *tmp_neigh_node; |
475 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
476 | |
477 | rcu_read_lock(); | |
478 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
479 | bonding_list) { | |
480 | if (!first_candidate) | |
481 | first_candidate = tmp_neigh_node; | |
482 | ||
483 | /* recv_if == NULL on the first node. */ | |
484 | if (tmp_neigh_node->if_incoming == recv_if) | |
485 | continue; | |
486 | ||
487 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
488 | continue; | |
489 | ||
490 | router = tmp_neigh_node; | |
491 | break; | |
492 | } | |
493 | ||
494 | /* use the first candidate if nothing was found. */ | |
495 | if (!router && first_candidate && | |
496 | atomic_inc_not_zero(&first_candidate->refcount)) | |
497 | router = first_candidate; | |
498 | ||
499 | if (!router) | |
500 | goto out; | |
501 | ||
502 | /* selected should point to the next element | |
9cfc7bd6 SE |
503 | * after the current router |
504 | */ | |
55158629 LL |
505 | spin_lock_bh(&primary_orig->neigh_list_lock); |
506 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
507 | * does not exist as rcu version |
508 | */ | |
55158629 LL |
509 | list_del_rcu(&primary_orig->bond_list); |
510 | list_add_rcu(&primary_orig->bond_list, | |
511 | &router->bonding_list); | |
512 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
513 | ||
514 | out: | |
515 | rcu_read_unlock(); | |
516 | return router; | |
517 | } | |
518 | ||
6680a124 AQ |
519 | /** |
520 | * batadv_find_ifalter_router - find the best of the remaining candidates which | |
521 | * are not using this interface | |
522 | * @bat_priv: the bat priv with all the soft interface information | |
523 | * @primary_orig: the destination | |
524 | * @recv_if: the interface that the router returned by this function has to not | |
525 | * use | |
55158629 | 526 | * |
6680a124 AQ |
527 | * Returns the best candidate towards primary_orig that is not using recv_if. |
528 | * Increases the returned neighbor's refcount | |
9cfc7bd6 | 529 | */ |
56303d34 | 530 | static struct batadv_neigh_node * |
6680a124 AQ |
531 | batadv_find_ifalter_router(struct batadv_priv *bat_priv, |
532 | struct batadv_orig_node *primary_orig, | |
56303d34 | 533 | const struct batadv_hard_iface *recv_if) |
55158629 | 534 | { |
56303d34 | 535 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; |
6680a124 AQ |
536 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
537 | struct batadv_neigh_node *tmp_neigh_node; | |
55158629 LL |
538 | |
539 | rcu_read_lock(); | |
540 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
541 | bonding_list) { | |
542 | if (!first_candidate) | |
543 | first_candidate = tmp_neigh_node; | |
544 | ||
545 | /* recv_if == NULL on the first node. */ | |
546 | if (tmp_neigh_node->if_incoming == recv_if) | |
547 | continue; | |
548 | ||
6680a124 | 549 | if (router && bao->bat_neigh_cmp(tmp_neigh_node, router)) |
fe3f4cfe SE |
550 | continue; |
551 | ||
55158629 LL |
552 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
553 | continue; | |
554 | ||
fe3f4cfe SE |
555 | /* decrement refcount of previously selected router */ |
556 | if (router) | |
557 | batadv_neigh_node_free_ref(router); | |
55158629 | 558 | |
fe3f4cfe SE |
559 | /* we found a better router (or at least one valid router) */ |
560 | router = tmp_neigh_node; | |
55158629 LL |
561 | } |
562 | ||
563 | /* use the first candidate if nothing was found. */ | |
564 | if (!router && first_candidate && | |
565 | atomic_inc_not_zero(&first_candidate->refcount)) | |
566 | router = first_candidate; | |
567 | ||
568 | rcu_read_unlock(); | |
569 | return router; | |
570 | } | |
571 | ||
f86ce0ad MH |
572 | /** |
573 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 574 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
575 | * @skb: packet to check |
576 | * @hdr_size: size of header to pull | |
577 | * | |
578 | * Check for short header and bad addresses in given packet. Returns negative | |
579 | * value when check fails and 0 otherwise. The negative value depends on the | |
580 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
581 | * and -EREMOTE for non-local (other host) destination. | |
582 | */ | |
fe8a93b9 AQ |
583 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
584 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
585 | { |
586 | struct ethhdr *ethhdr; | |
587 | ||
588 | /* drop packet if it has not necessary minimum size */ | |
589 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 590 | return -ENODATA; |
ff51fd70 | 591 | |
7ed4be95 | 592 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
593 | |
594 | /* packet with unicast indication but broadcast recipient */ | |
595 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 596 | return -EBADR; |
ff51fd70 MH |
597 | |
598 | /* packet with broadcast sender address */ | |
599 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 600 | return -EBADR; |
ff51fd70 MH |
601 | |
602 | /* not for me */ | |
fe8a93b9 | 603 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 604 | return -EREMOTE; |
ff51fd70 MH |
605 | |
606 | return 0; | |
607 | } | |
608 | ||
c6c8fea2 | 609 | /* find a suitable router for this originator, and use |
a4c135c5 | 610 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
611 | * refcount. |
612 | */ | |
56303d34 SE |
613 | struct batadv_neigh_node * |
614 | batadv_find_router(struct batadv_priv *bat_priv, | |
615 | struct batadv_orig_node *orig_node, | |
616 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 617 | { |
56303d34 SE |
618 | struct batadv_orig_node *primary_orig_node; |
619 | struct batadv_orig_node *router_orig; | |
620 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
621 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
622 | int bonding_enabled; | |
da641193 | 623 | uint8_t *primary_addr; |
c6c8fea2 SE |
624 | |
625 | if (!orig_node) | |
626 | return NULL; | |
627 | ||
7d211efc | 628 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 629 | if (!router) |
01df2b65 | 630 | goto err; |
c6c8fea2 SE |
631 | |
632 | /* without bonding, the first node should | |
9cfc7bd6 SE |
633 | * always choose the default router. |
634 | */ | |
c6c8fea2 SE |
635 | bonding_enabled = atomic_read(&bat_priv->bonding); |
636 | ||
a4c135c5 SW |
637 | rcu_read_lock(); |
638 | /* select default router to output */ | |
e1a5382f | 639 | router_orig = router->orig_node; |
01df2b65 ML |
640 | if (!router_orig) |
641 | goto err_unlock; | |
a4c135c5 | 642 | |
a4c135c5 SW |
643 | if ((!recv_if) && (!bonding_enabled)) |
644 | goto return_router; | |
c6c8fea2 | 645 | |
da641193 SE |
646 | primary_addr = router_orig->primary_addr; |
647 | ||
c6c8fea2 | 648 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
649 | * for a potential bonding candidate. |
650 | */ | |
1eda58bf | 651 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 652 | goto return_router; |
c6c8fea2 SE |
653 | |
654 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
655 | * even be the same as our router_orig in many cases |
656 | */ | |
1eda58bf | 657 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
658 | primary_orig_node = router_orig; |
659 | } else { | |
da641193 SE |
660 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
661 | primary_addr); | |
c6c8fea2 | 662 | if (!primary_orig_node) |
a4c135c5 | 663 | goto return_router; |
7aadf889 | 664 | |
7d211efc | 665 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
666 | } |
667 | ||
668 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
669 | * bonding and prefer the original router. |
670 | */ | |
a4c135c5 SW |
671 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
672 | goto return_router; | |
c6c8fea2 | 673 | |
c6c8fea2 SE |
674 | /* all nodes between should choose a candidate which |
675 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
676 | * in. |
677 | */ | |
7d211efc | 678 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 679 | |
55158629 | 680 | if (bonding_enabled) |
63b01037 | 681 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 682 | else |
6680a124 AQ |
683 | router = batadv_find_ifalter_router(bat_priv, primary_orig_node, |
684 | recv_if); | |
c6c8fea2 | 685 | |
a4c135c5 | 686 | return_router: |
e9a4f295 | 687 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
688 | goto err_unlock; |
689 | ||
a4c135c5 | 690 | rcu_read_unlock(); |
c6c8fea2 | 691 | return router; |
01df2b65 ML |
692 | err_unlock: |
693 | rcu_read_unlock(); | |
694 | err: | |
695 | if (router) | |
7d211efc | 696 | batadv_neigh_node_free_ref(router); |
01df2b65 | 697 | return NULL; |
c6c8fea2 SE |
698 | } |
699 | ||
63b01037 | 700 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 701 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 702 | { |
56303d34 SE |
703 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 705 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 706 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 707 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 708 | |
96412690 | 709 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
710 | |
711 | /* TTL exceeded */ | |
76543d14 | 712 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
713 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
714 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 715 | goto out; |
c6c8fea2 SE |
716 | } |
717 | ||
718 | /* get routing information */ | |
da641193 | 719 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 720 | |
44524fcd | 721 | if (!orig_node) |
b5a6f69c | 722 | goto out; |
c6c8fea2 | 723 | |
c6c8fea2 | 724 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 725 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 726 | goto out; |
c6c8fea2 | 727 | |
c6c8fea2 | 728 | /* decrement ttl */ |
f097e25d | 729 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
76543d14 | 730 | unicast_packet->header.ttl--; |
c6c8fea2 | 731 | |
c54f38c9 SW |
732 | switch (unicast_packet->header.packet_type) { |
733 | case BATADV_UNICAST_4ADDR: | |
734 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
735 | break; | |
736 | case BATADV_UNICAST: | |
737 | hdr_len = sizeof(struct batadv_unicast_packet); | |
738 | break; | |
739 | default: | |
740 | /* other packet types not supported - yet */ | |
741 | hdr_len = -1; | |
742 | break; | |
743 | } | |
744 | ||
745 | if (hdr_len > 0) | |
746 | batadv_skb_set_priority(skb, hdr_len); | |
747 | ||
e91ecfc6 | 748 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 749 | |
e91ecfc6 MH |
750 | /* translate transmit result into receive result */ |
751 | if (res == NET_XMIT_SUCCESS) { | |
752 | /* skb was transmitted and consumed */ | |
95332477 MH |
753 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
754 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
755 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
756 | |
757 | ret = NET_RX_SUCCESS; | |
758 | } else if (res == NET_XMIT_POLICED) { | |
759 | /* skb was buffered and consumed */ | |
760 | ret = NET_RX_SUCCESS; | |
95332477 | 761 | } |
c6c8fea2 | 762 | |
44524fcd | 763 | out: |
44524fcd | 764 | if (orig_node) |
7d211efc | 765 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 766 | return ret; |
c6c8fea2 SE |
767 | } |
768 | ||
7c1fd91d AQ |
769 | /** |
770 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
771 | * @bat_priv: the bat priv with all the soft interface information | |
772 | * @unicast_packet: the unicast header to be updated | |
773 | * @dst_addr: the payload destination | |
c018ad3d | 774 | * @vid: VLAN identifier |
7c1fd91d AQ |
775 | * |
776 | * Search the translation table for dst_addr and update the unicast header with | |
777 | * the new corresponding information (originator address where the destination | |
778 | * client currently is and its known TTVN) | |
779 | * | |
780 | * Returns true if the packet header has been updated, false otherwise | |
781 | */ | |
782 | static bool | |
783 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
784 | struct batadv_unicast_packet *unicast_packet, | |
c018ad3d | 785 | uint8_t *dst_addr, unsigned short vid) |
7c1fd91d AQ |
786 | { |
787 | struct batadv_orig_node *orig_node = NULL; | |
788 | struct batadv_hard_iface *primary_if = NULL; | |
789 | bool ret = false; | |
790 | uint8_t *orig_addr, orig_ttvn; | |
791 | ||
c018ad3d | 792 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
793 | primary_if = batadv_primary_if_get_selected(bat_priv); |
794 | if (!primary_if) | |
795 | goto out; | |
796 | orig_addr = primary_if->net_dev->dev_addr; | |
797 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
798 | } else { | |
c018ad3d AQ |
799 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
800 | vid); | |
7c1fd91d AQ |
801 | if (!orig_node) |
802 | goto out; | |
803 | ||
804 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
805 | goto out; | |
806 | ||
807 | orig_addr = orig_node->orig; | |
808 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
809 | } | |
810 | ||
811 | /* update the packet header */ | |
812 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
813 | unicast_packet->ttvn = orig_ttvn; | |
814 | ||
815 | ret = true; | |
816 | out: | |
817 | if (primary_if) | |
818 | batadv_hardif_free_ref(primary_if); | |
819 | if (orig_node) | |
820 | batadv_orig_node_free_ref(orig_node); | |
821 | ||
822 | return ret; | |
823 | } | |
824 | ||
56303d34 | 825 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 826 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
827 | struct batadv_unicast_packet *unicast_packet; |
828 | struct batadv_hard_iface *primary_if; | |
56303d34 | 829 | struct batadv_orig_node *orig_node; |
c018ad3d | 830 | uint8_t curr_ttvn, old_ttvn; |
a73105b8 | 831 | struct ethhdr *ethhdr; |
c018ad3d | 832 | unsigned short vid; |
3e34819e | 833 | int is_old_ttvn; |
a73105b8 | 834 | |
b8fcfa42 | 835 | /* check if there is enough data before accessing it */ |
dd981ab0 | 836 | if (pskb_may_pull(skb, hdr_len + ETH_HLEN) < 0) |
b8fcfa42 AQ |
837 | return 0; |
838 | ||
839 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
840 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
841 | return 0; |
842 | ||
96412690 | 843 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 844 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 845 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 846 | |
7c1fd91d AQ |
847 | /* check if the destination client was served by this node and it is now |
848 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
849 | * message and that it knows the new destination in the mesh to re-route | |
850 | * the packet to | |
851 | */ | |
c018ad3d | 852 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 853 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 854 | ethhdr->h_dest, vid)) |
7c1fd91d AQ |
855 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, |
856 | bat_priv, | |
857 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
858 | unicast_packet->dest, | |
859 | ethhdr->h_dest); | |
860 | /* at this point the mesh destination should have been | |
861 | * substituted with the originator address found in the global | |
862 | * table. If not, let the packet go untouched anyway because | |
863 | * there is nothing the node can do | |
864 | */ | |
865 | return 1; | |
866 | } | |
867 | ||
868 | /* retrieve the TTVN known by this node for the packet destination. This | |
869 | * value is used later to check if the node which sent (or re-routed | |
870 | * last time) the packet had an updated information or not | |
871 | */ | |
872 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 873 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
874 | orig_node = batadv_orig_hash_find(bat_priv, |
875 | unicast_packet->dest); | |
7c1fd91d AQ |
876 | /* if it is not possible to find the orig_node representing the |
877 | * destination, the packet can immediately be dropped as it will | |
878 | * not be possible to deliver it | |
879 | */ | |
a73105b8 AQ |
880 | if (!orig_node) |
881 | return 0; | |
882 | ||
883 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 884 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
885 | } |
886 | ||
7c1fd91d AQ |
887 | /* check if the TTVN contained in the packet is fresher than what the |
888 | * node knows | |
889 | */ | |
3e34819e | 890 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
891 | if (!is_old_ttvn) |
892 | return 1; | |
a73105b8 | 893 | |
7c1fd91d AQ |
894 | old_ttvn = unicast_packet->ttvn; |
895 | /* the packet was forged based on outdated network information. Its | |
896 | * destination can possibly be updated and forwarded towards the new | |
897 | * target host | |
898 | */ | |
899 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 900 | ethhdr->h_dest, vid)) { |
7c1fd91d AQ |
901 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, |
902 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
903 | unicast_packet->dest, ethhdr->h_dest, | |
904 | old_ttvn, curr_ttvn); | |
905 | return 1; | |
906 | } | |
3275e7cc | 907 | |
7c1fd91d AQ |
908 | /* the packet has not been re-routed: either the destination is |
909 | * currently served by this node or there is no destination at all and | |
910 | * it is possible to drop the packet | |
911 | */ | |
c018ad3d | 912 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 913 | return 0; |
3275e7cc | 914 | |
7c1fd91d AQ |
915 | /* update the header in order to let the packet be delivered to this |
916 | * node's soft interface | |
917 | */ | |
918 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
919 | if (!primary_if) | |
920 | return 0; | |
a73105b8 | 921 | |
7c1fd91d AQ |
922 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
923 | ||
924 | batadv_hardif_free_ref(primary_if); | |
925 | ||
926 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 927 | |
a73105b8 AQ |
928 | return 1; |
929 | } | |
930 | ||
a1f1ac5c SW |
931 | /** |
932 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
933 | * are in the unicast number space but not yet known to the implementation | |
934 | * @skb: unicast tvlv packet to process | |
935 | * @recv_if: pointer to interface this packet was received on | |
936 | * | |
937 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
938 | * otherwise. | |
939 | */ | |
940 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
941 | struct batadv_hard_iface *recv_if) | |
942 | { | |
943 | struct batadv_unicast_packet *unicast_packet; | |
944 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
945 | int check, hdr_size = sizeof(*unicast_packet); | |
946 | ||
947 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
948 | if (check < 0) | |
949 | return NET_RX_DROP; | |
950 | ||
951 | /* we don't know about this type, drop it. */ | |
952 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
953 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
954 | return NET_RX_DROP; | |
955 | ||
956 | return batadv_route_unicast_packet(skb, recv_if); | |
957 | } | |
958 | ||
56303d34 SE |
959 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
960 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 961 | { |
56303d34 | 962 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 963 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 964 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
965 | uint8_t *orig_addr; |
966 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 967 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 968 | bool is4addr; |
c6c8fea2 | 969 | |
7cdcf6dd | 970 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 971 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 972 | |
c384ea3e | 973 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 974 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 975 | if (is4addr) |
4046b24a | 976 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 977 | |
612d2b4f | 978 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 979 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
980 | |
981 | /* Even though the packet is not for us, we might save it to use for | |
982 | * decoding a later received coded packet | |
983 | */ | |
984 | if (check == -EREMOTE) | |
985 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
986 | ||
987 | if (check < 0) | |
c6c8fea2 | 988 | return NET_RX_DROP; |
dd981ab0 | 989 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
990 | return NET_RX_DROP; |
991 | ||
c6c8fea2 | 992 | /* packet for me */ |
fe8a93b9 | 993 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 994 | if (is4addr) { |
4046b24a MH |
995 | batadv_dat_inc_counter(bat_priv, |
996 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
997 | orig_addr = unicast_4addr_packet->src; |
998 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
999 | } | |
4046b24a | 1000 | |
c384ea3e AQ |
1001 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1002 | hdr_size)) | |
1003 | goto rx_success; | |
1004 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1005 | hdr_size)) | |
1006 | goto rx_success; | |
1007 | ||
37135173 | 1008 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 1009 | orig_node); |
37135173 | 1010 | |
c384ea3e | 1011 | rx_success: |
9affec6b AQ |
1012 | if (orig_node) |
1013 | batadv_orig_node_free_ref(orig_node); | |
1014 | ||
c6c8fea2 SE |
1015 | return NET_RX_SUCCESS; |
1016 | } | |
1017 | ||
63b01037 | 1018 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1019 | } |
1020 | ||
ef261577 ML |
1021 | /** |
1022 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
1023 | * @skb: unicast tvlv packet to process | |
1024 | * @recv_if: pointer to interface this packet was received on | |
1025 | * @dst_addr: the payload destination | |
1026 | * | |
1027 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1028 | * otherwise. | |
1029 | */ | |
1030 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
1031 | struct batadv_hard_iface *recv_if) | |
1032 | { | |
1033 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1034 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1035 | unsigned char *tvlv_buff; | |
1036 | uint16_t tvlv_buff_len; | |
1037 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
1038 | int ret = NET_RX_DROP; | |
1039 | ||
1040 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
1041 | return NET_RX_DROP; | |
1042 | ||
1043 | /* the header is likely to be modified while forwarding */ | |
1044 | if (skb_cow(skb, hdr_size) < 0) | |
1045 | return NET_RX_DROP; | |
1046 | ||
1047 | /* packet needs to be linearized to access the tvlv content */ | |
1048 | if (skb_linearize(skb) < 0) | |
1049 | return NET_RX_DROP; | |
1050 | ||
1051 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1052 | ||
1053 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1054 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1055 | ||
1056 | if (tvlv_buff_len > skb->len - hdr_size) | |
1057 | return NET_RX_DROP; | |
1058 | ||
1059 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1060 | unicast_tvlv_packet->src, | |
1061 | unicast_tvlv_packet->dst, | |
1062 | tvlv_buff, tvlv_buff_len); | |
1063 | ||
1064 | if (ret != NET_RX_SUCCESS) | |
1065 | ret = batadv_route_unicast_packet(skb, recv_if); | |
1066 | ||
1067 | return ret; | |
1068 | } | |
c6c8fea2 | 1069 | |
610bfc6b MH |
1070 | /** |
1071 | * batadv_recv_frag_packet - process received fragment | |
1072 | * @skb: the received fragment | |
1073 | * @recv_if: interface that the skb is received on | |
1074 | * | |
1075 | * This function does one of the three following things: 1) Forward fragment, if | |
1076 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1077 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1078 | * | |
1079 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
1080 | */ | |
1081 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1082 | struct batadv_hard_iface *recv_if) | |
1083 | { | |
1084 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1085 | struct batadv_orig_node *orig_node_src = NULL; | |
1086 | struct batadv_frag_packet *frag_packet; | |
1087 | int ret = NET_RX_DROP; | |
1088 | ||
1089 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1090 | sizeof(*frag_packet)) < 0) | |
1091 | goto out; | |
1092 | ||
1093 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1094 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1095 | if (!orig_node_src) | |
1096 | goto out; | |
1097 | ||
1098 | /* Route the fragment if it is not for us and too big to be merged. */ | |
1099 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1100 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1101 | ret = NET_RX_SUCCESS; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1106 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1107 | ||
1108 | /* Add fragment to buffer and merge if possible. */ | |
1109 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1110 | goto out; | |
1111 | ||
1112 | /* Deliver merged packet to the appropriate handler, if it was | |
1113 | * merged | |
1114 | */ | |
1115 | if (skb) | |
1116 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1117 | &recv_if->batman_adv_ptype, NULL); | |
1118 | ||
1119 | ret = NET_RX_SUCCESS; | |
1120 | ||
1121 | out: | |
1122 | if (orig_node_src) | |
1123 | batadv_orig_node_free_ref(orig_node_src); | |
1124 | ||
1125 | return ret; | |
1126 | } | |
1127 | ||
56303d34 SE |
1128 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1129 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1130 | { |
56303d34 SE |
1131 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1132 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1133 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1134 | struct ethhdr *ethhdr; |
704509b8 | 1135 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1136 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1137 | int32_t seq_diff; |
1138 | ||
1139 | /* drop packet if it has not necessary minimum size */ | |
1140 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1141 | goto out; |
c6c8fea2 | 1142 | |
7ed4be95 | 1143 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1144 | |
1145 | /* packet with broadcast indication but unicast recipient */ | |
1146 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1147 | goto out; |
c6c8fea2 SE |
1148 | |
1149 | /* packet with broadcast sender address */ | |
1150 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1151 | goto out; |
c6c8fea2 SE |
1152 | |
1153 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1154 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1155 | goto out; |
c6c8fea2 | 1156 | |
96412690 | 1157 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1158 | |
1159 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1160 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1161 | goto out; |
c6c8fea2 | 1162 | |
76543d14 | 1163 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1164 | goto out; |
c6c8fea2 | 1165 | |
da641193 | 1166 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1167 | |
1168 | if (!orig_node) | |
b5a6f69c | 1169 | goto out; |
c6c8fea2 | 1170 | |
f3e0008f | 1171 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1172 | |
1173 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1174 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1175 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1176 | goto spin_unlock; |
c6c8fea2 SE |
1177 | |
1178 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1179 | ||
1180 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1181 | if (batadv_window_protected(bat_priv, seq_diff, |
1182 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1183 | goto spin_unlock; |
c6c8fea2 SE |
1184 | |
1185 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1186 | * if required. |
1187 | */ | |
0f5f9322 | 1188 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1189 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1190 | ||
f3e0008f | 1191 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1192 | |
fe2da6ff | 1193 | /* check whether this has been sent by another originator before */ |
004e86fc | 1194 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1195 | goto out; |
1196 | ||
c54f38c9 SW |
1197 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1198 | ||
c6c8fea2 | 1199 | /* rebroadcast packet */ |
9455e34c | 1200 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1201 | |
23721387 SW |
1202 | /* don't hand the broadcast up if it is from an originator |
1203 | * from the same backbone. | |
1204 | */ | |
08adf151 | 1205 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1206 | goto out; |
1207 | ||
c384ea3e AQ |
1208 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1209 | goto rx_success; | |
1210 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1211 | goto rx_success; | |
1212 | ||
c6c8fea2 | 1213 | /* broadcast for me */ |
37135173 AQ |
1214 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1215 | orig_node); | |
c384ea3e AQ |
1216 | |
1217 | rx_success: | |
f3e0008f ML |
1218 | ret = NET_RX_SUCCESS; |
1219 | goto out; | |
c6c8fea2 | 1220 | |
f3e0008f ML |
1221 | spin_unlock: |
1222 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1223 | out: |
1224 | if (orig_node) | |
7d211efc | 1225 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1226 | return ret; |
c6c8fea2 | 1227 | } |