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" | |
c6c8fea2 | 28 | #include "vis.h" |
c6c8fea2 | 29 | #include "unicast.h" |
23721387 | 30 | #include "bridge_loop_avoidance.h" |
c384ea3e | 31 | #include "distributed-arp-table.h" |
c6c8fea2 | 32 | |
63b01037 | 33 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 34 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 35 | |
56303d34 | 36 | void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 37 | { |
56303d34 | 38 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 39 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 40 | struct hlist_head *head; |
56303d34 | 41 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 42 | unsigned long *word; |
c90681b8 | 43 | uint32_t i; |
c6c8fea2 | 44 | size_t word_index; |
42d0b044 | 45 | uint8_t *w; |
c6c8fea2 | 46 | |
c6c8fea2 SE |
47 | for (i = 0; i < hash->size; i++) { |
48 | head = &hash->table[i]; | |
49 | ||
fb778ea1 | 50 | rcu_read_lock(); |
b67bfe0d | 51 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
2ae2daf6 | 52 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
42d0b044 | 53 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
c6c8fea2 SE |
54 | word = &(orig_node->bcast_own[word_index]); |
55 | ||
0f5f9322 | 56 | batadv_bit_get_packet(bat_priv, word, 1, 0); |
42d0b044 SE |
57 | w = &orig_node->bcast_own_sum[hard_iface->if_num]; |
58 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); | |
2ae2daf6 | 59 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 60 | } |
fb778ea1 | 61 | rcu_read_unlock(); |
c6c8fea2 | 62 | } |
c6c8fea2 SE |
63 | } |
64 | ||
56303d34 SE |
65 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
66 | struct batadv_orig_node *orig_node, | |
67 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 68 | { |
56303d34 | 69 | struct batadv_neigh_node *curr_router; |
e1a5382f | 70 | |
7d211efc | 71 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 72 | |
c6c8fea2 | 73 | /* route deleted */ |
e1a5382f | 74 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
75 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
76 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
77 | batadv_tt_global_del_orig(bat_priv, orig_node, |
78 | "Deleted route towards originator"); | |
c6c8fea2 | 79 | |
e1a5382f LL |
80 | /* route added */ |
81 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 82 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
83 | "Adding route towards: %pM (via %pM)\n", |
84 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 85 | /* route changed */ |
bb899b89 | 86 | } else if (neigh_node && curr_router) { |
39c75a51 | 87 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
88 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
89 | orig_node->orig, neigh_node->addr, | |
90 | curr_router->addr); | |
c6c8fea2 SE |
91 | } |
92 | ||
e1a5382f | 93 | if (curr_router) |
7d211efc | 94 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
95 | |
96 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
97 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
98 | neigh_node = NULL; | |
e1a5382f LL |
99 | |
100 | spin_lock_bh(&orig_node->neigh_list_lock); | |
101 | rcu_assign_pointer(orig_node->router, neigh_node); | |
102 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
103 | ||
104 | /* decrease refcount of previous best neighbor */ | |
105 | if (curr_router) | |
7d211efc | 106 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
107 | } |
108 | ||
56303d34 SE |
109 | void batadv_update_route(struct batadv_priv *bat_priv, |
110 | struct batadv_orig_node *orig_node, | |
111 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 112 | { |
56303d34 | 113 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
114 | |
115 | if (!orig_node) | |
e1a5382f LL |
116 | goto out; |
117 | ||
7d211efc | 118 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 119 | |
e1a5382f | 120 | if (router != neigh_node) |
63b01037 | 121 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
122 | |
123 | out: | |
124 | if (router) | |
7d211efc | 125 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
126 | } |
127 | ||
a4c135c5 | 128 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
129 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
130 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
131 | { |
132 | /* this neighbor is not part of our candidate list */ | |
133 | if (list_empty(&neigh_node->bonding_list)) | |
134 | goto out; | |
135 | ||
136 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 137 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 138 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
139 | atomic_dec(&orig_node->bond_candidates); |
140 | ||
141 | out: | |
142 | return; | |
143 | } | |
144 | ||
56303d34 SE |
145 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
146 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 | 147 | { |
56303d34 | 148 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 149 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
150 | |
151 | spin_lock_bh(&orig_node->neigh_list_lock); | |
152 | ||
153 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
154 | if (!batadv_compare_eth(orig_node->orig, |
155 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
156 | goto candidate_del; |
157 | ||
7d211efc | 158 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 159 | if (!router) |
a4c135c5 SW |
160 | goto candidate_del; |
161 | ||
a4c135c5 | 162 | /* ... and is good enough to be considered */ |
42d0b044 | 163 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
164 | goto candidate_del; |
165 | ||
9cfc7bd6 | 166 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
167 | * interface. If we do, we won't select this candidate because of |
168 | * possible interference. | |
169 | */ | |
b67bfe0d | 170 | hlist_for_each_entry_rcu(tmp_neigh_node, |
a4c135c5 | 171 | &orig_node->neigh_list, list) { |
a4c135c5 SW |
172 | if (tmp_neigh_node == neigh_node) |
173 | continue; | |
174 | ||
175 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
176 | * considered as candidate. |
177 | */ | |
a4c135c5 SW |
178 | if (list_empty(&tmp_neigh_node->bonding_list)) |
179 | continue; | |
180 | ||
181 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
182 | (batadv_compare_eth(neigh_node->addr, |
183 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
184 | interference_candidate = 1; |
185 | break; | |
186 | } | |
187 | } | |
188 | ||
189 | /* don't care further if it is an interference candidate */ | |
190 | if (interference_candidate) | |
191 | goto candidate_del; | |
192 | ||
193 | /* this neighbor already is part of our candidate list */ | |
194 | if (!list_empty(&neigh_node->bonding_list)) | |
195 | goto out; | |
196 | ||
44524fcd ML |
197 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
198 | goto out; | |
199 | ||
a4c135c5 | 200 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
201 | atomic_inc(&orig_node->bond_candidates); |
202 | goto out; | |
203 | ||
204 | candidate_del: | |
30d3c511 | 205 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
206 | |
207 | out: | |
208 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
209 | |
210 | if (router) | |
7d211efc | 211 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
212 | } |
213 | ||
214 | /* copy primary address for bonding */ | |
30d3c511 | 215 | void |
56303d34 SE |
216 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
217 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 218 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 219 | { |
acd34afa | 220 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
221 | return; |
222 | ||
223 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
224 | } | |
225 | ||
c6c8fea2 SE |
226 | /* checks whether the host restarted and is in the protection time. |
227 | * returns: | |
228 | * 0 if the packet is to be accepted | |
229 | * 1 if the packet is to be ignored. | |
230 | */ | |
56303d34 | 231 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 232 | unsigned long *last_reset) |
c6c8fea2 | 233 | { |
42d0b044 SE |
234 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
235 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
236 | if (!batadv_has_timed_out(*last_reset, | |
237 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 238 | return 1; |
8c7bf248 ML |
239 | |
240 | *last_reset = jiffies; | |
39c75a51 | 241 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 242 | "old packet received, start protection\n"); |
c6c8fea2 | 243 | } |
8c7bf248 | 244 | |
c6c8fea2 SE |
245 | return 0; |
246 | } | |
247 | ||
30d3c511 | 248 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 249 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 250 | int header_len) |
c6c8fea2 | 251 | { |
c6c8fea2 SE |
252 | struct ethhdr *ethhdr; |
253 | ||
254 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
255 | if (unlikely(!pskb_may_pull(skb, header_len))) |
256 | return false; | |
c6c8fea2 SE |
257 | |
258 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
259 | ||
260 | /* packet with broadcast indication but unicast recipient */ | |
261 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 262 | return false; |
c6c8fea2 SE |
263 | |
264 | /* packet with broadcast sender address */ | |
265 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 266 | return false; |
c6c8fea2 SE |
267 | |
268 | /* create a copy of the skb, if needed, to modify it. */ | |
269 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 270 | return false; |
c6c8fea2 SE |
271 | |
272 | /* keep skb linear */ | |
273 | if (skb_linearize(skb) < 0) | |
c3e29312 | 274 | return false; |
c6c8fea2 | 275 | |
c3e29312 | 276 | return true; |
c6c8fea2 SE |
277 | } |
278 | ||
56303d34 | 279 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 280 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 281 | { |
56303d34 SE |
282 | struct batadv_hard_iface *primary_if = NULL; |
283 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 284 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 285 | int ret = NET_RX_DROP; |
c6c8fea2 | 286 | |
96412690 | 287 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
288 | |
289 | /* add data to device queue */ | |
acd34afa | 290 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 291 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 292 | goto out; |
c6c8fea2 SE |
293 | } |
294 | ||
e5d89254 | 295 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 296 | if (!primary_if) |
44524fcd | 297 | goto out; |
c6c8fea2 SE |
298 | |
299 | /* answer echo request (ping) */ | |
300 | /* get routing information */ | |
da641193 | 301 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 302 | if (!orig_node) |
e1a5382f | 303 | goto out; |
c6c8fea2 | 304 | |
44524fcd | 305 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 306 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
307 | goto out; |
308 | ||
96412690 | 309 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
310 | |
311 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 312 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 313 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 314 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 315 | |
bb351ba0 MH |
316 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
317 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 318 | |
44524fcd | 319 | out: |
32ae9b22 | 320 | if (primary_if) |
e5d89254 | 321 | batadv_hardif_free_ref(primary_if); |
44524fcd | 322 | if (orig_node) |
7d211efc | 323 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
324 | return ret; |
325 | } | |
326 | ||
56303d34 | 327 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 328 | struct sk_buff *skb) |
c6c8fea2 | 329 | { |
56303d34 SE |
330 | struct batadv_hard_iface *primary_if = NULL; |
331 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 332 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 333 | int ret = NET_RX_DROP; |
c6c8fea2 | 334 | |
96412690 | 335 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
336 | |
337 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 338 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
339 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
340 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 341 | goto out; |
c6c8fea2 SE |
342 | } |
343 | ||
e5d89254 | 344 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 345 | if (!primary_if) |
44524fcd | 346 | goto out; |
c6c8fea2 SE |
347 | |
348 | /* get routing information */ | |
da641193 | 349 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 350 | if (!orig_node) |
e1a5382f | 351 | goto out; |
c6c8fea2 | 352 | |
44524fcd | 353 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 354 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 355 | goto out; |
c6c8fea2 | 356 | |
96412690 | 357 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 358 | |
44524fcd | 359 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 360 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 361 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 362 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 363 | |
bb351ba0 MH |
364 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
365 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 366 | |
44524fcd | 367 | out: |
32ae9b22 | 368 | if (primary_if) |
e5d89254 | 369 | batadv_hardif_free_ref(primary_if); |
44524fcd | 370 | if (orig_node) |
7d211efc | 371 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
372 | return ret; |
373 | } | |
374 | ||
375 | ||
56303d34 SE |
376 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
377 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 378 | { |
56303d34 | 379 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 380 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 381 | struct ethhdr *ethhdr; |
56303d34 | 382 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 383 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 384 | int ret = NET_RX_DROP; |
c6c8fea2 | 385 | |
9cfc7bd6 | 386 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
387 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
388 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
389 | |
390 | /* drop packet if it has not necessary minimum size */ | |
391 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 392 | goto out; |
c6c8fea2 SE |
393 | |
394 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
395 | ||
396 | /* packet with unicast indication but broadcast recipient */ | |
397 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 398 | goto out; |
c6c8fea2 SE |
399 | |
400 | /* packet with broadcast sender address */ | |
401 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 402 | goto out; |
c6c8fea2 SE |
403 | |
404 | /* not for me */ | |
3193e8fd | 405 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
44524fcd | 406 | goto out; |
c6c8fea2 | 407 | |
96412690 | 408 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
409 | |
410 | /* add record route information if not full */ | |
96412690 | 411 | if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 412 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 413 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 414 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
415 | icmp_packet->rr_cur++; |
416 | } | |
417 | ||
418 | /* packet for me */ | |
3193e8fd | 419 | if (batadv_is_my_mac(icmp_packet->dst)) |
63b01037 | 420 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
421 | |
422 | /* TTL exceeded */ | |
76543d14 | 423 | if (icmp_packet->header.ttl < 2) |
63b01037 | 424 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 425 | |
c6c8fea2 | 426 | /* get routing information */ |
da641193 | 427 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 428 | if (!orig_node) |
e1a5382f | 429 | goto out; |
c6c8fea2 | 430 | |
44524fcd | 431 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 432 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 433 | goto out; |
c6c8fea2 | 434 | |
96412690 | 435 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 436 | |
44524fcd | 437 | /* decrement ttl */ |
76543d14 | 438 | icmp_packet->header.ttl--; |
44524fcd ML |
439 | |
440 | /* route it */ | |
bb351ba0 MH |
441 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) |
442 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 443 | |
44524fcd | 444 | out: |
44524fcd | 445 | if (orig_node) |
7d211efc | 446 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
447 | return ret; |
448 | } | |
449 | ||
55158629 LL |
450 | /* In the bonding case, send the packets in a round |
451 | * robin fashion over the remaining interfaces. | |
452 | * | |
453 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
454 | * returned router's refcount. |
455 | */ | |
56303d34 SE |
456 | static struct batadv_neigh_node * |
457 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
458 | const struct batadv_hard_iface *recv_if) | |
55158629 | 459 | { |
56303d34 SE |
460 | struct batadv_neigh_node *tmp_neigh_node; |
461 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
462 | |
463 | rcu_read_lock(); | |
464 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
465 | bonding_list) { | |
466 | if (!first_candidate) | |
467 | first_candidate = tmp_neigh_node; | |
468 | ||
469 | /* recv_if == NULL on the first node. */ | |
470 | if (tmp_neigh_node->if_incoming == recv_if) | |
471 | continue; | |
472 | ||
473 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
474 | continue; | |
475 | ||
476 | router = tmp_neigh_node; | |
477 | break; | |
478 | } | |
479 | ||
480 | /* use the first candidate if nothing was found. */ | |
481 | if (!router && first_candidate && | |
482 | atomic_inc_not_zero(&first_candidate->refcount)) | |
483 | router = first_candidate; | |
484 | ||
485 | if (!router) | |
486 | goto out; | |
487 | ||
488 | /* selected should point to the next element | |
9cfc7bd6 SE |
489 | * after the current router |
490 | */ | |
55158629 LL |
491 | spin_lock_bh(&primary_orig->neigh_list_lock); |
492 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
493 | * does not exist as rcu version |
494 | */ | |
55158629 LL |
495 | list_del_rcu(&primary_orig->bond_list); |
496 | list_add_rcu(&primary_orig->bond_list, | |
497 | &router->bonding_list); | |
498 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
499 | ||
500 | out: | |
501 | rcu_read_unlock(); | |
502 | return router; | |
503 | } | |
504 | ||
505 | /* Interface Alternating: Use the best of the | |
506 | * remaining candidates which are not using | |
507 | * this interface. | |
508 | * | |
9cfc7bd6 SE |
509 | * Increases the returned router's refcount |
510 | */ | |
56303d34 SE |
511 | static struct batadv_neigh_node * |
512 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
513 | const struct batadv_hard_iface *recv_if) | |
55158629 | 514 | { |
56303d34 SE |
515 | struct batadv_neigh_node *tmp_neigh_node; |
516 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
517 | |
518 | rcu_read_lock(); | |
519 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
520 | bonding_list) { | |
521 | if (!first_candidate) | |
522 | first_candidate = tmp_neigh_node; | |
523 | ||
524 | /* recv_if == NULL on the first node. */ | |
525 | if (tmp_neigh_node->if_incoming == recv_if) | |
526 | continue; | |
527 | ||
fe3f4cfe SE |
528 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
529 | continue; | |
530 | ||
55158629 LL |
531 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
532 | continue; | |
533 | ||
fe3f4cfe SE |
534 | /* decrement refcount of previously selected router */ |
535 | if (router) | |
536 | batadv_neigh_node_free_ref(router); | |
55158629 | 537 | |
fe3f4cfe SE |
538 | /* we found a better router (or at least one valid router) */ |
539 | router = tmp_neigh_node; | |
55158629 LL |
540 | } |
541 | ||
542 | /* use the first candidate if nothing was found. */ | |
543 | if (!router && first_candidate && | |
544 | atomic_inc_not_zero(&first_candidate->refcount)) | |
545 | router = first_candidate; | |
546 | ||
547 | rcu_read_unlock(); | |
548 | return router; | |
549 | } | |
550 | ||
f86ce0ad MH |
551 | /** |
552 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
553 | * @skb: packet to check | |
554 | * @hdr_size: size of header to pull | |
555 | * | |
556 | * Check for short header and bad addresses in given packet. Returns negative | |
557 | * value when check fails and 0 otherwise. The negative value depends on the | |
558 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
559 | * and -EREMOTE for non-local (other host) destination. | |
560 | */ | |
ff51fd70 MH |
561 | static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) |
562 | { | |
563 | struct ethhdr *ethhdr; | |
564 | ||
565 | /* drop packet if it has not necessary minimum size */ | |
566 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 567 | return -ENODATA; |
ff51fd70 MH |
568 | |
569 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
570 | ||
571 | /* packet with unicast indication but broadcast recipient */ | |
572 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 573 | return -EBADR; |
ff51fd70 MH |
574 | |
575 | /* packet with broadcast sender address */ | |
576 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 577 | return -EBADR; |
ff51fd70 MH |
578 | |
579 | /* not for me */ | |
580 | if (!batadv_is_my_mac(ethhdr->h_dest)) | |
f86ce0ad | 581 | return -EREMOTE; |
ff51fd70 MH |
582 | |
583 | return 0; | |
584 | } | |
585 | ||
56303d34 | 586 | int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
a73105b8 | 587 | { |
56303d34 | 588 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 589 | struct batadv_tt_query_packet *tt_query; |
f25bd58a | 590 | uint16_t tt_size; |
74ee3634 | 591 | int hdr_size = sizeof(*tt_query); |
1eda58bf | 592 | char tt_flag; |
96412690 | 593 | size_t packet_size; |
a73105b8 | 594 | |
74ee3634 MH |
595 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
596 | return NET_RX_DROP; | |
a73105b8 AQ |
597 | |
598 | /* I could need to modify it */ | |
96412690 | 599 | if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) |
a73105b8 AQ |
600 | goto out; |
601 | ||
96412690 | 602 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 603 | |
7e071c79 | 604 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 605 | case BATADV_TT_REQUEST: |
d69909d2 | 606 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 607 | |
a73105b8 | 608 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
609 | * forwarded |
610 | */ | |
08c36d3e | 611 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
612 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
613 | tt_flag = 'F'; | |
614 | else | |
615 | tt_flag = '.'; | |
616 | ||
39c75a51 | 617 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
618 | "Routing TT_REQUEST to %pM [%c]\n", |
619 | tt_query->dst, | |
620 | tt_flag); | |
63b01037 | 621 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
622 | } |
623 | break; | |
acd34afa | 624 | case BATADV_TT_RESPONSE: |
d69909d2 | 625 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 626 | |
3193e8fd | 627 | if (batadv_is_my_mac(tt_query->dst)) { |
dc58fe32 | 628 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
629 | * changes |
630 | */ | |
dc58fe32 AQ |
631 | if (skb_linearize(skb) < 0) |
632 | goto out; | |
d2b6cc8e | 633 | /* skb_linearize() possibly changed skb->data */ |
96412690 | 634 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 635 | |
08c36d3e | 636 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
637 | |
638 | /* Ensure we have all the claimed data */ | |
96412690 SE |
639 | packet_size = sizeof(struct batadv_tt_query_packet); |
640 | packet_size += tt_size; | |
641 | if (unlikely(skb_headlen(skb) < packet_size)) | |
8b7342d6 AQ |
642 | goto out; |
643 | ||
08c36d3e | 644 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 645 | } else { |
acd34afa SE |
646 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
647 | tt_flag = 'F'; | |
648 | else | |
649 | tt_flag = '.'; | |
39c75a51 | 650 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
651 | "Routing TT_RESPONSE to %pM [%c]\n", |
652 | tt_query->dst, | |
653 | tt_flag); | |
63b01037 | 654 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
655 | } |
656 | break; | |
657 | } | |
658 | ||
659 | out: | |
660 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
661 | return NET_RX_DROP; | |
662 | } | |
663 | ||
56303d34 | 664 | int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
cc47f66e | 665 | { |
56303d34 | 666 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 667 | struct batadv_roam_adv_packet *roam_adv_packet; |
56303d34 | 668 | struct batadv_orig_node *orig_node; |
cc47f66e | 669 | |
d48ddb83 | 670 | if (batadv_check_unicast_packet(skb, sizeof(*roam_adv_packet)) < 0) |
cc47f66e AQ |
671 | goto out; |
672 | ||
d69909d2 | 673 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 674 | |
96412690 | 675 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; |
cc47f66e | 676 | |
3193e8fd | 677 | if (!batadv_is_my_mac(roam_adv_packet->dst)) |
63b01037 | 678 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 679 | |
20ff9d59 SW |
680 | /* check if it is a backbone gateway. we don't accept |
681 | * roaming advertisement from it, as it has the same | |
682 | * entries as we have. | |
683 | */ | |
08adf151 | 684 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
685 | goto out; |
686 | ||
da641193 | 687 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
688 | if (!orig_node) |
689 | goto out; | |
690 | ||
39c75a51 | 691 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
692 | "Received ROAMING_ADV from %pM (client %pM)\n", |
693 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 694 | |
08c36d3e | 695 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 696 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 697 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e | 698 | |
7d211efc | 699 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
700 | out: |
701 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
702 | return NET_RX_DROP; | |
703 | } | |
704 | ||
c6c8fea2 | 705 | /* find a suitable router for this originator, and use |
a4c135c5 | 706 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
707 | * refcount. |
708 | */ | |
56303d34 SE |
709 | struct batadv_neigh_node * |
710 | batadv_find_router(struct batadv_priv *bat_priv, | |
711 | struct batadv_orig_node *orig_node, | |
712 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 713 | { |
56303d34 SE |
714 | struct batadv_orig_node *primary_orig_node; |
715 | struct batadv_orig_node *router_orig; | |
716 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
717 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
718 | int bonding_enabled; | |
da641193 | 719 | uint8_t *primary_addr; |
c6c8fea2 SE |
720 | |
721 | if (!orig_node) | |
722 | return NULL; | |
723 | ||
7d211efc | 724 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 725 | if (!router) |
01df2b65 | 726 | goto err; |
c6c8fea2 SE |
727 | |
728 | /* without bonding, the first node should | |
9cfc7bd6 SE |
729 | * always choose the default router. |
730 | */ | |
c6c8fea2 SE |
731 | bonding_enabled = atomic_read(&bat_priv->bonding); |
732 | ||
a4c135c5 SW |
733 | rcu_read_lock(); |
734 | /* select default router to output */ | |
e1a5382f | 735 | router_orig = router->orig_node; |
01df2b65 ML |
736 | if (!router_orig) |
737 | goto err_unlock; | |
a4c135c5 | 738 | |
a4c135c5 SW |
739 | if ((!recv_if) && (!bonding_enabled)) |
740 | goto return_router; | |
c6c8fea2 | 741 | |
da641193 SE |
742 | primary_addr = router_orig->primary_addr; |
743 | ||
c6c8fea2 | 744 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
745 | * for a potential bonding candidate. |
746 | */ | |
1eda58bf | 747 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 748 | goto return_router; |
c6c8fea2 SE |
749 | |
750 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
751 | * even be the same as our router_orig in many cases |
752 | */ | |
1eda58bf | 753 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
754 | primary_orig_node = router_orig; |
755 | } else { | |
da641193 SE |
756 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
757 | primary_addr); | |
c6c8fea2 | 758 | if (!primary_orig_node) |
a4c135c5 | 759 | goto return_router; |
7aadf889 | 760 | |
7d211efc | 761 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
762 | } |
763 | ||
764 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
765 | * bonding and prefer the original router. |
766 | */ | |
a4c135c5 SW |
767 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
768 | goto return_router; | |
c6c8fea2 | 769 | |
c6c8fea2 SE |
770 | /* all nodes between should choose a candidate which |
771 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
772 | * in. |
773 | */ | |
7d211efc | 774 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 775 | |
55158629 | 776 | if (bonding_enabled) |
63b01037 | 777 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 778 | else |
63b01037 | 779 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 780 | |
a4c135c5 | 781 | return_router: |
e9a4f295 | 782 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
783 | goto err_unlock; |
784 | ||
a4c135c5 | 785 | rcu_read_unlock(); |
c6c8fea2 | 786 | return router; |
01df2b65 ML |
787 | err_unlock: |
788 | rcu_read_unlock(); | |
789 | err: | |
790 | if (router) | |
7d211efc | 791 | batadv_neigh_node_free_ref(router); |
01df2b65 | 792 | return NULL; |
c6c8fea2 SE |
793 | } |
794 | ||
63b01037 | 795 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 796 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 797 | { |
56303d34 SE |
798 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
799 | struct batadv_orig_node *orig_node = NULL; | |
800 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 801 | struct batadv_unicast_packet *unicast_packet; |
c6c8fea2 | 802 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
44524fcd | 803 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
804 | struct sk_buff *new_skb; |
805 | ||
96412690 | 806 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
807 | |
808 | /* TTL exceeded */ | |
76543d14 | 809 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
810 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
811 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 812 | goto out; |
c6c8fea2 SE |
813 | } |
814 | ||
815 | /* get routing information */ | |
da641193 | 816 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 817 | |
44524fcd | 818 | if (!orig_node) |
b5a6f69c | 819 | goto out; |
c6c8fea2 | 820 | |
a4c135c5 | 821 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 822 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 823 | |
d0072609 | 824 | if (!neigh_node) |
44524fcd | 825 | goto out; |
c6c8fea2 SE |
826 | |
827 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 828 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 829 | goto out; |
c6c8fea2 | 830 | |
96412690 | 831 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 832 | |
acd34afa | 833 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 834 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 835 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
836 | ret = batadv_frag_send_skb(skb, bat_priv, |
837 | neigh_node->if_incoming, | |
838 | neigh_node->addr); | |
d0072609 ML |
839 | goto out; |
840 | } | |
c6c8fea2 | 841 | |
acd34afa | 842 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
843 | batadv_frag_can_reassemble(skb, |
844 | neigh_node->if_incoming->net_dev->mtu)) { | |
88ed1e77 | 845 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
846 | |
847 | if (ret == NET_RX_DROP) | |
44524fcd | 848 | goto out; |
c6c8fea2 SE |
849 | |
850 | /* packet was buffered for late merge */ | |
44524fcd ML |
851 | if (!new_skb) { |
852 | ret = NET_RX_SUCCESS; | |
853 | goto out; | |
854 | } | |
c6c8fea2 SE |
855 | |
856 | skb = new_skb; | |
96412690 | 857 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
858 | } |
859 | ||
860 | /* decrement ttl */ | |
76543d14 | 861 | unicast_packet->header.ttl--; |
c6c8fea2 | 862 | |
f8214865 | 863 | /* Update stats counter */ |
d69909d2 SE |
864 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
865 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
f8214865 MH |
866 | skb->len + ETH_HLEN); |
867 | ||
c6c8fea2 | 868 | /* route it */ |
bb351ba0 MH |
869 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) |
870 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 871 | |
44524fcd ML |
872 | out: |
873 | if (neigh_node) | |
7d211efc | 874 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 875 | if (orig_node) |
7d211efc | 876 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 877 | return ret; |
c6c8fea2 SE |
878 | } |
879 | ||
7c1fd91d AQ |
880 | /** |
881 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
882 | * @bat_priv: the bat priv with all the soft interface information | |
883 | * @unicast_packet: the unicast header to be updated | |
884 | * @dst_addr: the payload destination | |
885 | * | |
886 | * Search the translation table for dst_addr and update the unicast header with | |
887 | * the new corresponding information (originator address where the destination | |
888 | * client currently is and its known TTVN) | |
889 | * | |
890 | * Returns true if the packet header has been updated, false otherwise | |
891 | */ | |
892 | static bool | |
893 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
894 | struct batadv_unicast_packet *unicast_packet, | |
895 | uint8_t *dst_addr) | |
896 | { | |
897 | struct batadv_orig_node *orig_node = NULL; | |
898 | struct batadv_hard_iface *primary_if = NULL; | |
899 | bool ret = false; | |
900 | uint8_t *orig_addr, orig_ttvn; | |
901 | ||
902 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
903 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
904 | if (!primary_if) | |
905 | goto out; | |
906 | orig_addr = primary_if->net_dev->dev_addr; | |
907 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
908 | } else { | |
909 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
910 | if (!orig_node) | |
911 | goto out; | |
912 | ||
913 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
914 | goto out; | |
915 | ||
916 | orig_addr = orig_node->orig; | |
917 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
918 | } | |
919 | ||
920 | /* update the packet header */ | |
921 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
922 | unicast_packet->ttvn = orig_ttvn; | |
923 | ||
924 | ret = true; | |
925 | out: | |
926 | if (primary_if) | |
927 | batadv_hardif_free_ref(primary_if); | |
928 | if (orig_node) | |
929 | batadv_orig_node_free_ref(orig_node); | |
930 | ||
931 | return ret; | |
932 | } | |
933 | ||
56303d34 | 934 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
63b01037 | 935 | struct sk_buff *skb) { |
7c1fd91d | 936 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 937 | struct batadv_orig_node *orig_node; |
a73105b8 | 938 | struct ethhdr *ethhdr; |
56303d34 | 939 | struct batadv_hard_iface *primary_if; |
96412690 | 940 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 941 | int is_old_ttvn; |
a73105b8 | 942 | |
b8fcfa42 AQ |
943 | /* check if there is enough data before accessing it */ |
944 | if (pskb_may_pull(skb, sizeof(*unicast_packet) + ETH_HLEN) < 0) | |
945 | return 0; | |
946 | ||
947 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
948 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
949 | return 0; |
950 | ||
96412690 | 951 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
7c1fd91d | 952 | ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet)); |
a73105b8 | 953 | |
7c1fd91d AQ |
954 | /* check if the destination client was served by this node and it is now |
955 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
956 | * message and that it knows the new destination in the mesh to re-route | |
957 | * the packet to | |
958 | */ | |
959 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
960 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
961 | ethhdr->h_dest)) | |
962 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
963 | bat_priv, | |
964 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
965 | unicast_packet->dest, | |
966 | ethhdr->h_dest); | |
967 | /* at this point the mesh destination should have been | |
968 | * substituted with the originator address found in the global | |
969 | * table. If not, let the packet go untouched anyway because | |
970 | * there is nothing the node can do | |
971 | */ | |
972 | return 1; | |
973 | } | |
974 | ||
975 | /* retrieve the TTVN known by this node for the packet destination. This | |
976 | * value is used later to check if the node which sent (or re-routed | |
977 | * last time) the packet had an updated information or not | |
978 | */ | |
979 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
980 | if (!batadv_is_my_mac(unicast_packet->dest)) { | |
da641193 SE |
981 | orig_node = batadv_orig_hash_find(bat_priv, |
982 | unicast_packet->dest); | |
7c1fd91d AQ |
983 | /* if it is not possible to find the orig_node representing the |
984 | * destination, the packet can immediately be dropped as it will | |
985 | * not be possible to deliver it | |
986 | */ | |
a73105b8 AQ |
987 | if (!orig_node) |
988 | return 0; | |
989 | ||
990 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 991 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
992 | } |
993 | ||
7c1fd91d AQ |
994 | /* check if the TTVN contained in the packet is fresher than what the |
995 | * node knows | |
996 | */ | |
3e34819e | 997 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
998 | if (!is_old_ttvn) |
999 | return 1; | |
a73105b8 | 1000 | |
7c1fd91d AQ |
1001 | old_ttvn = unicast_packet->ttvn; |
1002 | /* the packet was forged based on outdated network information. Its | |
1003 | * destination can possibly be updated and forwarded towards the new | |
1004 | * target host | |
1005 | */ | |
1006 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
1007 | ethhdr->h_dest)) { | |
1008 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
1009 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
1010 | unicast_packet->dest, ethhdr->h_dest, | |
1011 | old_ttvn, curr_ttvn); | |
1012 | return 1; | |
1013 | } | |
3275e7cc | 1014 | |
7c1fd91d AQ |
1015 | /* the packet has not been re-routed: either the destination is |
1016 | * currently served by this node or there is no destination at all and | |
1017 | * it is possible to drop the packet | |
1018 | */ | |
1019 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
1020 | return 0; | |
3275e7cc | 1021 | |
7c1fd91d AQ |
1022 | /* update the header in order to let the packet be delivered to this |
1023 | * node's soft interface | |
1024 | */ | |
1025 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1026 | if (!primary_if) | |
1027 | return 0; | |
a73105b8 | 1028 | |
7c1fd91d AQ |
1029 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
1030 | ||
1031 | batadv_hardif_free_ref(primary_if); | |
1032 | ||
1033 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 1034 | |
a73105b8 AQ |
1035 | return 1; |
1036 | } | |
1037 | ||
56303d34 SE |
1038 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
1039 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1040 | { |
56303d34 | 1041 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1042 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 1043 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
1044 | uint8_t *orig_addr; |
1045 | struct batadv_orig_node *orig_node = NULL; | |
704509b8 | 1046 | int hdr_size = sizeof(*unicast_packet); |
c384ea3e | 1047 | bool is4addr; |
c6c8fea2 | 1048 | |
7cdcf6dd | 1049 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 1050 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 1051 | |
c384ea3e | 1052 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 1053 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 1054 | if (is4addr) |
4046b24a | 1055 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 1056 | |
63b01037 | 1057 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1058 | return NET_RX_DROP; |
1059 | ||
63b01037 | 1060 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1061 | return NET_RX_DROP; |
1062 | ||
c6c8fea2 | 1063 | /* packet for me */ |
3193e8fd | 1064 | if (batadv_is_my_mac(unicast_packet->dest)) { |
9affec6b | 1065 | if (is4addr) { |
4046b24a MH |
1066 | batadv_dat_inc_counter(bat_priv, |
1067 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
1068 | orig_addr = unicast_4addr_packet->src; |
1069 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
1070 | } | |
4046b24a | 1071 | |
c384ea3e AQ |
1072 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1073 | hdr_size)) | |
1074 | goto rx_success; | |
1075 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1076 | hdr_size)) | |
1077 | goto rx_success; | |
1078 | ||
37135173 | 1079 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 1080 | orig_node); |
37135173 | 1081 | |
c384ea3e | 1082 | rx_success: |
9affec6b AQ |
1083 | if (orig_node) |
1084 | batadv_orig_node_free_ref(orig_node); | |
1085 | ||
c6c8fea2 SE |
1086 | return NET_RX_SUCCESS; |
1087 | } | |
1088 | ||
63b01037 | 1089 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1090 | } |
1091 | ||
30d3c511 | 1092 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1093 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1094 | { |
56303d34 | 1095 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1096 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1097 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1098 | struct sk_buff *new_skb = NULL; |
1099 | int ret; | |
1100 | ||
63b01037 | 1101 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1102 | return NET_RX_DROP; |
1103 | ||
63b01037 | 1104 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1105 | return NET_RX_DROP; |
1106 | ||
96412690 | 1107 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1108 | |
1109 | /* packet for me */ | |
3193e8fd | 1110 | if (batadv_is_my_mac(unicast_packet->dest)) { |
88ed1e77 | 1111 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1112 | |
1113 | if (ret == NET_RX_DROP) | |
1114 | return NET_RX_DROP; | |
1115 | ||
1116 | /* packet was buffered for late merge */ | |
1117 | if (!new_skb) | |
1118 | return NET_RX_SUCCESS; | |
1119 | ||
c384ea3e AQ |
1120 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb, |
1121 | hdr_size)) | |
1122 | goto rx_success; | |
1123 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb, | |
1124 | hdr_size)) | |
1125 | goto rx_success; | |
1126 | ||
04b482a2 | 1127 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
37135173 | 1128 | sizeof(struct batadv_unicast_packet), NULL); |
c384ea3e AQ |
1129 | |
1130 | rx_success: | |
c6c8fea2 SE |
1131 | return NET_RX_SUCCESS; |
1132 | } | |
1133 | ||
63b01037 | 1134 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1135 | } |
1136 | ||
1137 | ||
56303d34 SE |
1138 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1139 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1140 | { |
56303d34 SE |
1141 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1142 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1143 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1144 | struct ethhdr *ethhdr; |
704509b8 | 1145 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1146 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1147 | int32_t seq_diff; |
1148 | ||
1149 | /* drop packet if it has not necessary minimum size */ | |
1150 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1151 | goto out; |
c6c8fea2 SE |
1152 | |
1153 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1154 | ||
1155 | /* packet with broadcast indication but unicast recipient */ | |
1156 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1157 | goto out; |
c6c8fea2 SE |
1158 | |
1159 | /* packet with broadcast sender address */ | |
1160 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1161 | goto out; |
c6c8fea2 SE |
1162 | |
1163 | /* ignore broadcasts sent by myself */ | |
3193e8fd | 1164 | if (batadv_is_my_mac(ethhdr->h_source)) |
f3e0008f | 1165 | goto out; |
c6c8fea2 | 1166 | |
96412690 | 1167 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1168 | |
1169 | /* ignore broadcasts originated by myself */ | |
3193e8fd | 1170 | if (batadv_is_my_mac(bcast_packet->orig)) |
f3e0008f | 1171 | goto out; |
c6c8fea2 | 1172 | |
76543d14 | 1173 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1174 | goto out; |
c6c8fea2 | 1175 | |
da641193 | 1176 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1177 | |
1178 | if (!orig_node) | |
b5a6f69c | 1179 | goto out; |
c6c8fea2 | 1180 | |
f3e0008f | 1181 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1182 | |
1183 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1184 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1185 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1186 | goto spin_unlock; |
c6c8fea2 SE |
1187 | |
1188 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1189 | ||
1190 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1191 | if (batadv_window_protected(bat_priv, seq_diff, |
1192 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1193 | goto spin_unlock; |
c6c8fea2 SE |
1194 | |
1195 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1196 | * if required. |
1197 | */ | |
0f5f9322 | 1198 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1199 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1200 | ||
f3e0008f | 1201 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1202 | |
fe2da6ff | 1203 | /* check whether this has been sent by another originator before */ |
004e86fc | 1204 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1205 | goto out; |
1206 | ||
c6c8fea2 | 1207 | /* rebroadcast packet */ |
9455e34c | 1208 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1209 | |
23721387 SW |
1210 | /* don't hand the broadcast up if it is from an originator |
1211 | * from the same backbone. | |
1212 | */ | |
08adf151 | 1213 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1214 | goto out; |
1215 | ||
c384ea3e AQ |
1216 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1217 | goto rx_success; | |
1218 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1219 | goto rx_success; | |
1220 | ||
c6c8fea2 | 1221 | /* broadcast for me */ |
37135173 AQ |
1222 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1223 | orig_node); | |
c384ea3e AQ |
1224 | |
1225 | rx_success: | |
f3e0008f ML |
1226 | ret = NET_RX_SUCCESS; |
1227 | goto out; | |
c6c8fea2 | 1228 | |
f3e0008f ML |
1229 | spin_unlock: |
1230 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1231 | out: |
1232 | if (orig_node) | |
7d211efc | 1233 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1234 | return ret; |
c6c8fea2 SE |
1235 | } |
1236 | ||
56303d34 SE |
1237 | int batadv_recv_vis_packet(struct sk_buff *skb, |
1238 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1239 | { |
96412690 | 1240 | struct batadv_vis_packet *vis_packet; |
c6c8fea2 | 1241 | struct ethhdr *ethhdr; |
56303d34 | 1242 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704509b8 | 1243 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1244 | |
1245 | /* keep skb linear */ | |
1246 | if (skb_linearize(skb) < 0) | |
1247 | return NET_RX_DROP; | |
1248 | ||
1249 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1250 | return NET_RX_DROP; | |
1251 | ||
96412690 | 1252 | vis_packet = (struct batadv_vis_packet *)skb->data; |
c6c8fea2 SE |
1253 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
1254 | ||
1255 | /* not for me */ | |
3193e8fd | 1256 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
1257 | return NET_RX_DROP; |
1258 | ||
1259 | /* ignore own packets */ | |
3193e8fd | 1260 | if (batadv_is_my_mac(vis_packet->vis_orig)) |
c6c8fea2 SE |
1261 | return NET_RX_DROP; |
1262 | ||
3193e8fd | 1263 | if (batadv_is_my_mac(vis_packet->sender_orig)) |
c6c8fea2 SE |
1264 | return NET_RX_DROP; |
1265 | ||
1266 | switch (vis_packet->vis_type) { | |
acd34afa | 1267 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1268 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1269 | skb_headlen(skb)); | |
c6c8fea2 SE |
1270 | break; |
1271 | ||
acd34afa | 1272 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1273 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1274 | skb_headlen(skb)); | |
c6c8fea2 SE |
1275 | break; |
1276 | ||
1277 | default: /* ignore unknown packet */ | |
1278 | break; | |
1279 | } | |
1280 | ||
1281 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1282 | * always free the skbuf. |
1283 | */ | |
c6c8fea2 SE |
1284 | return NET_RX_DROP; |
1285 | } |