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9cfc7bd6 | 1 | /* Copyright (C) 2007-2012 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" |
c6c8fea2 | 31 | |
63b01037 | 32 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 33 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 34 | |
56303d34 | 35 | void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 36 | { |
56303d34 | 37 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 38 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
7aadf889 | 39 | struct hlist_node *node; |
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(); |
7aadf889 | 51 | hlist_for_each_entry_rcu(orig_node, 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)) { | |
c6c8fea2 | 82 | |
39c75a51 | 83 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
84 | "Adding route towards: %pM (via %pM)\n", |
85 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 86 | /* route changed */ |
bb899b89 | 87 | } else if (neigh_node && curr_router) { |
39c75a51 | 88 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
89 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
90 | orig_node->orig, neigh_node->addr, | |
91 | curr_router->addr); | |
c6c8fea2 SE |
92 | } |
93 | ||
e1a5382f | 94 | if (curr_router) |
7d211efc | 95 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
96 | |
97 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
98 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
99 | neigh_node = NULL; | |
e1a5382f LL |
100 | |
101 | spin_lock_bh(&orig_node->neigh_list_lock); | |
102 | rcu_assign_pointer(orig_node->router, neigh_node); | |
103 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
104 | ||
105 | /* decrease refcount of previous best neighbor */ | |
106 | if (curr_router) | |
7d211efc | 107 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
108 | } |
109 | ||
56303d34 SE |
110 | void batadv_update_route(struct batadv_priv *bat_priv, |
111 | struct batadv_orig_node *orig_node, | |
112 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 113 | { |
56303d34 | 114 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
115 | |
116 | if (!orig_node) | |
e1a5382f LL |
117 | goto out; |
118 | ||
7d211efc | 119 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 120 | |
e1a5382f | 121 | if (router != neigh_node) |
63b01037 | 122 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
123 | |
124 | out: | |
125 | if (router) | |
7d211efc | 126 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
127 | } |
128 | ||
a4c135c5 | 129 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
130 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
131 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
132 | { |
133 | /* this neighbor is not part of our candidate list */ | |
134 | if (list_empty(&neigh_node->bonding_list)) | |
135 | goto out; | |
136 | ||
137 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 138 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 139 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
140 | atomic_dec(&orig_node->bond_candidates); |
141 | ||
142 | out: | |
143 | return; | |
144 | } | |
145 | ||
56303d34 SE |
146 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
147 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
148 | { |
149 | struct hlist_node *node; | |
56303d34 | 150 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 151 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
152 | |
153 | spin_lock_bh(&orig_node->neigh_list_lock); | |
154 | ||
155 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
156 | if (!batadv_compare_eth(orig_node->orig, |
157 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
158 | goto candidate_del; |
159 | ||
7d211efc | 160 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 161 | if (!router) |
a4c135c5 SW |
162 | goto candidate_del; |
163 | ||
a4c135c5 | 164 | /* ... and is good enough to be considered */ |
42d0b044 | 165 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
166 | goto candidate_del; |
167 | ||
9cfc7bd6 | 168 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
169 | * interface. If we do, we won't select this candidate because of |
170 | * possible interference. | |
171 | */ | |
172 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
173 | &orig_node->neigh_list, list) { | |
174 | ||
175 | if (tmp_neigh_node == neigh_node) | |
176 | continue; | |
177 | ||
178 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
179 | * considered as candidate. |
180 | */ | |
a4c135c5 SW |
181 | if (list_empty(&tmp_neigh_node->bonding_list)) |
182 | continue; | |
183 | ||
184 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
185 | (batadv_compare_eth(neigh_node->addr, |
186 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
187 | interference_candidate = 1; |
188 | break; | |
189 | } | |
190 | } | |
191 | ||
192 | /* don't care further if it is an interference candidate */ | |
193 | if (interference_candidate) | |
194 | goto candidate_del; | |
195 | ||
196 | /* this neighbor already is part of our candidate list */ | |
197 | if (!list_empty(&neigh_node->bonding_list)) | |
198 | goto out; | |
199 | ||
44524fcd ML |
200 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
201 | goto out; | |
202 | ||
a4c135c5 | 203 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
204 | atomic_inc(&orig_node->bond_candidates); |
205 | goto out; | |
206 | ||
207 | candidate_del: | |
30d3c511 | 208 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
209 | |
210 | out: | |
211 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
212 | |
213 | if (router) | |
7d211efc | 214 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
215 | } |
216 | ||
217 | /* copy primary address for bonding */ | |
30d3c511 | 218 | void |
56303d34 SE |
219 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
220 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 221 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 222 | { |
acd34afa | 223 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
224 | return; |
225 | ||
226 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
227 | } | |
228 | ||
c6c8fea2 SE |
229 | /* checks whether the host restarted and is in the protection time. |
230 | * returns: | |
231 | * 0 if the packet is to be accepted | |
232 | * 1 if the packet is to be ignored. | |
233 | */ | |
56303d34 | 234 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 235 | unsigned long *last_reset) |
c6c8fea2 | 236 | { |
42d0b044 SE |
237 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
238 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
239 | if (!batadv_has_timed_out(*last_reset, | |
240 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 241 | return 1; |
8c7bf248 ML |
242 | |
243 | *last_reset = jiffies; | |
39c75a51 | 244 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 245 | "old packet received, start protection\n"); |
c6c8fea2 | 246 | } |
8c7bf248 | 247 | |
c6c8fea2 SE |
248 | return 0; |
249 | } | |
250 | ||
30d3c511 | 251 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 252 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 253 | int header_len) |
c6c8fea2 | 254 | { |
c6c8fea2 SE |
255 | struct ethhdr *ethhdr; |
256 | ||
257 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
258 | if (unlikely(!pskb_may_pull(skb, header_len))) |
259 | return false; | |
c6c8fea2 SE |
260 | |
261 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
262 | ||
263 | /* packet with broadcast indication but unicast recipient */ | |
264 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 265 | return false; |
c6c8fea2 SE |
266 | |
267 | /* packet with broadcast sender address */ | |
268 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 269 | return false; |
c6c8fea2 SE |
270 | |
271 | /* create a copy of the skb, if needed, to modify it. */ | |
272 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 273 | return false; |
c6c8fea2 SE |
274 | |
275 | /* keep skb linear */ | |
276 | if (skb_linearize(skb) < 0) | |
c3e29312 | 277 | return false; |
c6c8fea2 | 278 | |
c3e29312 | 279 | return true; |
c6c8fea2 SE |
280 | } |
281 | ||
56303d34 | 282 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 283 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 284 | { |
56303d34 SE |
285 | struct batadv_hard_iface *primary_if = NULL; |
286 | struct batadv_orig_node *orig_node = NULL; | |
287 | struct batadv_neigh_node *router = NULL; | |
96412690 | 288 | struct batadv_icmp_packet_rr *icmp_packet; |
44524fcd | 289 | int ret = NET_RX_DROP; |
c6c8fea2 | 290 | |
96412690 | 291 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
292 | |
293 | /* add data to device queue */ | |
acd34afa | 294 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 295 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 296 | goto out; |
c6c8fea2 SE |
297 | } |
298 | ||
e5d89254 | 299 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 300 | if (!primary_if) |
44524fcd | 301 | goto out; |
c6c8fea2 SE |
302 | |
303 | /* answer echo request (ping) */ | |
304 | /* get routing information */ | |
da641193 | 305 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 306 | if (!orig_node) |
e1a5382f | 307 | goto out; |
c6c8fea2 | 308 | |
7d211efc | 309 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
310 | if (!router) |
311 | goto out; | |
c6c8fea2 | 312 | |
44524fcd | 313 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 314 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
315 | goto out; |
316 | ||
96412690 | 317 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
318 | |
319 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 320 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 321 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 322 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 323 | |
9455e34c | 324 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 325 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 326 | |
44524fcd | 327 | out: |
32ae9b22 | 328 | if (primary_if) |
e5d89254 | 329 | batadv_hardif_free_ref(primary_if); |
e1a5382f | 330 | if (router) |
7d211efc | 331 | batadv_neigh_node_free_ref(router); |
44524fcd | 332 | if (orig_node) |
7d211efc | 333 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
334 | return ret; |
335 | } | |
336 | ||
56303d34 | 337 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 338 | struct sk_buff *skb) |
c6c8fea2 | 339 | { |
56303d34 SE |
340 | struct batadv_hard_iface *primary_if = NULL; |
341 | struct batadv_orig_node *orig_node = NULL; | |
342 | struct batadv_neigh_node *router = NULL; | |
96412690 | 343 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 344 | int ret = NET_RX_DROP; |
c6c8fea2 | 345 | |
96412690 | 346 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
347 | |
348 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 349 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
350 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
351 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 352 | goto out; |
c6c8fea2 SE |
353 | } |
354 | ||
e5d89254 | 355 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 356 | if (!primary_if) |
44524fcd | 357 | goto out; |
c6c8fea2 SE |
358 | |
359 | /* get routing information */ | |
da641193 | 360 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 361 | if (!orig_node) |
e1a5382f | 362 | goto out; |
c6c8fea2 | 363 | |
7d211efc | 364 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
365 | if (!router) |
366 | goto out; | |
c6c8fea2 | 367 | |
44524fcd | 368 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 369 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 370 | goto out; |
c6c8fea2 | 371 | |
96412690 | 372 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 373 | |
44524fcd | 374 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 375 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 376 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 377 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 378 | |
9455e34c | 379 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 380 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 381 | |
44524fcd | 382 | out: |
32ae9b22 | 383 | if (primary_if) |
e5d89254 | 384 | batadv_hardif_free_ref(primary_if); |
e1a5382f | 385 | if (router) |
7d211efc | 386 | batadv_neigh_node_free_ref(router); |
44524fcd | 387 | if (orig_node) |
7d211efc | 388 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
389 | return ret; |
390 | } | |
391 | ||
392 | ||
56303d34 SE |
393 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
394 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 395 | { |
56303d34 | 396 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 397 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 398 | struct ethhdr *ethhdr; |
56303d34 SE |
399 | struct batadv_orig_node *orig_node = NULL; |
400 | struct batadv_neigh_node *router = NULL; | |
96412690 | 401 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 402 | int ret = NET_RX_DROP; |
c6c8fea2 | 403 | |
9cfc7bd6 | 404 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
405 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
406 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
407 | |
408 | /* drop packet if it has not necessary minimum size */ | |
409 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 410 | goto out; |
c6c8fea2 SE |
411 | |
412 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
413 | ||
414 | /* packet with unicast indication but broadcast recipient */ | |
415 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 416 | goto out; |
c6c8fea2 SE |
417 | |
418 | /* packet with broadcast sender address */ | |
419 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 420 | goto out; |
c6c8fea2 SE |
421 | |
422 | /* not for me */ | |
3193e8fd | 423 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
44524fcd | 424 | goto out; |
c6c8fea2 | 425 | |
96412690 | 426 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
427 | |
428 | /* add record route information if not full */ | |
96412690 | 429 | if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 430 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 431 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 432 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
433 | icmp_packet->rr_cur++; |
434 | } | |
435 | ||
436 | /* packet for me */ | |
3193e8fd | 437 | if (batadv_is_my_mac(icmp_packet->dst)) |
63b01037 | 438 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
439 | |
440 | /* TTL exceeded */ | |
76543d14 | 441 | if (icmp_packet->header.ttl < 2) |
63b01037 | 442 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 443 | |
c6c8fea2 | 444 | /* get routing information */ |
da641193 | 445 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 446 | if (!orig_node) |
e1a5382f | 447 | goto out; |
c6c8fea2 | 448 | |
7d211efc | 449 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
450 | if (!router) |
451 | goto out; | |
c6c8fea2 | 452 | |
44524fcd | 453 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 454 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 455 | goto out; |
c6c8fea2 | 456 | |
96412690 | 457 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 458 | |
44524fcd | 459 | /* decrement ttl */ |
76543d14 | 460 | icmp_packet->header.ttl--; |
44524fcd ML |
461 | |
462 | /* route it */ | |
9455e34c | 463 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 464 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 465 | |
44524fcd | 466 | out: |
e1a5382f | 467 | if (router) |
7d211efc | 468 | batadv_neigh_node_free_ref(router); |
44524fcd | 469 | if (orig_node) |
7d211efc | 470 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
471 | return ret; |
472 | } | |
473 | ||
55158629 LL |
474 | /* In the bonding case, send the packets in a round |
475 | * robin fashion over the remaining interfaces. | |
476 | * | |
477 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
478 | * returned router's refcount. |
479 | */ | |
56303d34 SE |
480 | static struct batadv_neigh_node * |
481 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
482 | const struct batadv_hard_iface *recv_if) | |
55158629 | 483 | { |
56303d34 SE |
484 | struct batadv_neigh_node *tmp_neigh_node; |
485 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
486 | |
487 | rcu_read_lock(); | |
488 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
489 | bonding_list) { | |
490 | if (!first_candidate) | |
491 | first_candidate = tmp_neigh_node; | |
492 | ||
493 | /* recv_if == NULL on the first node. */ | |
494 | if (tmp_neigh_node->if_incoming == recv_if) | |
495 | continue; | |
496 | ||
497 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
498 | continue; | |
499 | ||
500 | router = tmp_neigh_node; | |
501 | break; | |
502 | } | |
503 | ||
504 | /* use the first candidate if nothing was found. */ | |
505 | if (!router && first_candidate && | |
506 | atomic_inc_not_zero(&first_candidate->refcount)) | |
507 | router = first_candidate; | |
508 | ||
509 | if (!router) | |
510 | goto out; | |
511 | ||
512 | /* selected should point to the next element | |
9cfc7bd6 SE |
513 | * after the current router |
514 | */ | |
55158629 LL |
515 | spin_lock_bh(&primary_orig->neigh_list_lock); |
516 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
517 | * does not exist as rcu version |
518 | */ | |
55158629 LL |
519 | list_del_rcu(&primary_orig->bond_list); |
520 | list_add_rcu(&primary_orig->bond_list, | |
521 | &router->bonding_list); | |
522 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
523 | ||
524 | out: | |
525 | rcu_read_unlock(); | |
526 | return router; | |
527 | } | |
528 | ||
529 | /* Interface Alternating: Use the best of the | |
530 | * remaining candidates which are not using | |
531 | * this interface. | |
532 | * | |
9cfc7bd6 SE |
533 | * Increases the returned router's refcount |
534 | */ | |
56303d34 SE |
535 | static struct batadv_neigh_node * |
536 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
537 | const struct batadv_hard_iface *recv_if) | |
55158629 | 538 | { |
56303d34 SE |
539 | struct batadv_neigh_node *tmp_neigh_node; |
540 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
541 | |
542 | rcu_read_lock(); | |
543 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
544 | bonding_list) { | |
545 | if (!first_candidate) | |
546 | first_candidate = tmp_neigh_node; | |
547 | ||
548 | /* recv_if == NULL on the first node. */ | |
549 | if (tmp_neigh_node->if_incoming == recv_if) | |
550 | continue; | |
551 | ||
552 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
553 | continue; | |
554 | ||
555 | /* if we don't have a router yet | |
9cfc7bd6 SE |
556 | * or this one is better, choose it. |
557 | */ | |
55158629 LL |
558 | if ((!router) || |
559 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
560 | /* decrement refcount of | |
9cfc7bd6 SE |
561 | * previously selected router |
562 | */ | |
55158629 | 563 | if (router) |
7d211efc | 564 | batadv_neigh_node_free_ref(router); |
55158629 LL |
565 | |
566 | router = tmp_neigh_node; | |
567 | atomic_inc_not_zero(&router->refcount); | |
568 | } | |
569 | ||
7d211efc | 570 | batadv_neigh_node_free_ref(tmp_neigh_node); |
55158629 LL |
571 | } |
572 | ||
573 | /* use the first candidate if nothing was found. */ | |
574 | if (!router && first_candidate && | |
575 | atomic_inc_not_zero(&first_candidate->refcount)) | |
576 | router = first_candidate; | |
577 | ||
578 | rcu_read_unlock(); | |
579 | return router; | |
580 | } | |
581 | ||
56303d34 | 582 | int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
a73105b8 | 583 | { |
56303d34 | 584 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 585 | struct batadv_tt_query_packet *tt_query; |
f25bd58a | 586 | uint16_t tt_size; |
a73105b8 | 587 | struct ethhdr *ethhdr; |
1eda58bf | 588 | char tt_flag; |
96412690 | 589 | size_t packet_size; |
a73105b8 AQ |
590 | |
591 | /* drop packet if it has not necessary minimum size */ | |
96412690 SE |
592 | if (unlikely(!pskb_may_pull(skb, |
593 | sizeof(struct batadv_tt_query_packet)))) | |
a73105b8 AQ |
594 | goto out; |
595 | ||
596 | /* I could need to modify it */ | |
96412690 | 597 | if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) |
a73105b8 AQ |
598 | goto out; |
599 | ||
600 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
601 | ||
602 | /* packet with unicast indication but broadcast recipient */ | |
603 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
604 | goto out; | |
605 | ||
606 | /* packet with broadcast sender address */ | |
607 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
608 | goto out; | |
609 | ||
96412690 | 610 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 611 | |
7e071c79 | 612 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 613 | case BATADV_TT_REQUEST: |
d69909d2 | 614 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 615 | |
a73105b8 | 616 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
617 | * forwarded |
618 | */ | |
08c36d3e | 619 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
620 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
621 | tt_flag = 'F'; | |
622 | else | |
623 | tt_flag = '.'; | |
624 | ||
39c75a51 | 625 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
626 | "Routing TT_REQUEST to %pM [%c]\n", |
627 | tt_query->dst, | |
628 | tt_flag); | |
63b01037 | 629 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
630 | } |
631 | break; | |
acd34afa | 632 | case BATADV_TT_RESPONSE: |
d69909d2 | 633 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 634 | |
3193e8fd | 635 | if (batadv_is_my_mac(tt_query->dst)) { |
dc58fe32 | 636 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
637 | * changes |
638 | */ | |
dc58fe32 AQ |
639 | if (skb_linearize(skb) < 0) |
640 | goto out; | |
d2b6cc8e | 641 | /* skb_linearize() possibly changed skb->data */ |
96412690 | 642 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 643 | |
08c36d3e | 644 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
645 | |
646 | /* Ensure we have all the claimed data */ | |
96412690 SE |
647 | packet_size = sizeof(struct batadv_tt_query_packet); |
648 | packet_size += tt_size; | |
649 | if (unlikely(skb_headlen(skb) < packet_size)) | |
8b7342d6 AQ |
650 | goto out; |
651 | ||
08c36d3e | 652 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 653 | } else { |
acd34afa SE |
654 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
655 | tt_flag = 'F'; | |
656 | else | |
657 | tt_flag = '.'; | |
39c75a51 | 658 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
659 | "Routing TT_RESPONSE to %pM [%c]\n", |
660 | tt_query->dst, | |
661 | tt_flag); | |
63b01037 | 662 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
663 | } |
664 | break; | |
665 | } | |
666 | ||
667 | out: | |
668 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
669 | return NET_RX_DROP; | |
670 | } | |
671 | ||
56303d34 | 672 | int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
cc47f66e | 673 | { |
56303d34 | 674 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 675 | struct batadv_roam_adv_packet *roam_adv_packet; |
56303d34 | 676 | struct batadv_orig_node *orig_node; |
cc47f66e AQ |
677 | struct ethhdr *ethhdr; |
678 | ||
679 | /* drop packet if it has not necessary minimum size */ | |
96412690 SE |
680 | if (unlikely(!pskb_may_pull(skb, |
681 | sizeof(struct batadv_roam_adv_packet)))) | |
cc47f66e AQ |
682 | goto out; |
683 | ||
684 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
685 | ||
686 | /* packet with unicast indication but broadcast recipient */ | |
687 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
688 | goto out; | |
689 | ||
690 | /* packet with broadcast sender address */ | |
691 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
692 | goto out; | |
693 | ||
d69909d2 | 694 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 695 | |
96412690 | 696 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; |
cc47f66e | 697 | |
3193e8fd | 698 | if (!batadv_is_my_mac(roam_adv_packet->dst)) |
63b01037 | 699 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 700 | |
20ff9d59 SW |
701 | /* check if it is a backbone gateway. we don't accept |
702 | * roaming advertisement from it, as it has the same | |
703 | * entries as we have. | |
704 | */ | |
08adf151 | 705 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
706 | goto out; |
707 | ||
da641193 | 708 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
709 | if (!orig_node) |
710 | goto out; | |
711 | ||
39c75a51 | 712 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
713 | "Received ROAMING_ADV from %pM (client %pM)\n", |
714 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 715 | |
08c36d3e | 716 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 717 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 718 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e AQ |
719 | |
720 | /* Roaming phase starts: I have new information but the ttvn has not | |
721 | * been incremented yet. This flag will make me check all the incoming | |
9cfc7bd6 SE |
722 | * packets for the correct destination. |
723 | */ | |
807736f6 | 724 | bat_priv->tt.poss_change = true; |
cc47f66e | 725 | |
7d211efc | 726 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
727 | out: |
728 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
729 | return NET_RX_DROP; | |
730 | } | |
731 | ||
c6c8fea2 | 732 | /* find a suitable router for this originator, and use |
a4c135c5 | 733 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
734 | * refcount. |
735 | */ | |
56303d34 SE |
736 | struct batadv_neigh_node * |
737 | batadv_find_router(struct batadv_priv *bat_priv, | |
738 | struct batadv_orig_node *orig_node, | |
739 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 740 | { |
56303d34 SE |
741 | struct batadv_orig_node *primary_orig_node; |
742 | struct batadv_orig_node *router_orig; | |
743 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
744 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
745 | int bonding_enabled; | |
da641193 | 746 | uint8_t *primary_addr; |
c6c8fea2 SE |
747 | |
748 | if (!orig_node) | |
749 | return NULL; | |
750 | ||
7d211efc | 751 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 752 | if (!router) |
01df2b65 | 753 | goto err; |
c6c8fea2 SE |
754 | |
755 | /* without bonding, the first node should | |
9cfc7bd6 SE |
756 | * always choose the default router. |
757 | */ | |
c6c8fea2 SE |
758 | bonding_enabled = atomic_read(&bat_priv->bonding); |
759 | ||
a4c135c5 SW |
760 | rcu_read_lock(); |
761 | /* select default router to output */ | |
e1a5382f | 762 | router_orig = router->orig_node; |
01df2b65 ML |
763 | if (!router_orig) |
764 | goto err_unlock; | |
a4c135c5 | 765 | |
a4c135c5 SW |
766 | if ((!recv_if) && (!bonding_enabled)) |
767 | goto return_router; | |
c6c8fea2 | 768 | |
da641193 SE |
769 | primary_addr = router_orig->primary_addr; |
770 | ||
c6c8fea2 | 771 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
772 | * for a potential bonding candidate. |
773 | */ | |
1eda58bf | 774 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 775 | goto return_router; |
c6c8fea2 SE |
776 | |
777 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
778 | * even be the same as our router_orig in many cases |
779 | */ | |
1eda58bf | 780 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
781 | primary_orig_node = router_orig; |
782 | } else { | |
da641193 SE |
783 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
784 | primary_addr); | |
c6c8fea2 | 785 | if (!primary_orig_node) |
a4c135c5 | 786 | goto return_router; |
7aadf889 | 787 | |
7d211efc | 788 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
789 | } |
790 | ||
791 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
792 | * bonding and prefer the original router. |
793 | */ | |
a4c135c5 SW |
794 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
795 | goto return_router; | |
c6c8fea2 | 796 | |
c6c8fea2 SE |
797 | /* all nodes between should choose a candidate which |
798 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
799 | * in. |
800 | */ | |
7d211efc | 801 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 802 | |
55158629 | 803 | if (bonding_enabled) |
63b01037 | 804 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 805 | else |
63b01037 | 806 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 807 | |
a4c135c5 | 808 | return_router: |
e9a4f295 | 809 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
810 | goto err_unlock; |
811 | ||
a4c135c5 | 812 | rcu_read_unlock(); |
c6c8fea2 | 813 | return router; |
01df2b65 ML |
814 | err_unlock: |
815 | rcu_read_unlock(); | |
816 | err: | |
817 | if (router) | |
7d211efc | 818 | batadv_neigh_node_free_ref(router); |
01df2b65 | 819 | return NULL; |
c6c8fea2 SE |
820 | } |
821 | ||
63b01037 | 822 | static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) |
c6c8fea2 SE |
823 | { |
824 | struct ethhdr *ethhdr; | |
825 | ||
826 | /* drop packet if it has not necessary minimum size */ | |
827 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
828 | return -1; | |
829 | ||
830 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
831 | ||
832 | /* packet with unicast indication but broadcast recipient */ | |
833 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
834 | return -1; | |
835 | ||
836 | /* packet with broadcast sender address */ | |
837 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
838 | return -1; | |
839 | ||
840 | /* not for me */ | |
3193e8fd | 841 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
842 | return -1; |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
63b01037 | 847 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 848 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 849 | { |
56303d34 SE |
850 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
851 | struct batadv_orig_node *orig_node = NULL; | |
852 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 853 | struct batadv_unicast_packet *unicast_packet; |
c6c8fea2 | 854 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
44524fcd | 855 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
856 | struct sk_buff *new_skb; |
857 | ||
96412690 | 858 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
859 | |
860 | /* TTL exceeded */ | |
76543d14 | 861 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
862 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
863 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 864 | goto out; |
c6c8fea2 SE |
865 | } |
866 | ||
867 | /* get routing information */ | |
da641193 | 868 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 869 | |
44524fcd | 870 | if (!orig_node) |
b5a6f69c | 871 | goto out; |
c6c8fea2 | 872 | |
a4c135c5 | 873 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 874 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 875 | |
d0072609 | 876 | if (!neigh_node) |
44524fcd | 877 | goto out; |
c6c8fea2 SE |
878 | |
879 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 880 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 881 | goto out; |
c6c8fea2 | 882 | |
96412690 | 883 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 884 | |
acd34afa | 885 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 886 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 887 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
888 | ret = batadv_frag_send_skb(skb, bat_priv, |
889 | neigh_node->if_incoming, | |
890 | neigh_node->addr); | |
d0072609 ML |
891 | goto out; |
892 | } | |
c6c8fea2 | 893 | |
acd34afa | 894 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
895 | batadv_frag_can_reassemble(skb, |
896 | neigh_node->if_incoming->net_dev->mtu)) { | |
c6c8fea2 | 897 | |
88ed1e77 | 898 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
899 | |
900 | if (ret == NET_RX_DROP) | |
44524fcd | 901 | goto out; |
c6c8fea2 SE |
902 | |
903 | /* packet was buffered for late merge */ | |
44524fcd ML |
904 | if (!new_skb) { |
905 | ret = NET_RX_SUCCESS; | |
906 | goto out; | |
907 | } | |
c6c8fea2 SE |
908 | |
909 | skb = new_skb; | |
96412690 | 910 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
911 | } |
912 | ||
913 | /* decrement ttl */ | |
76543d14 | 914 | unicast_packet->header.ttl--; |
c6c8fea2 | 915 | |
f8214865 | 916 | /* Update stats counter */ |
d69909d2 SE |
917 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
918 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
f8214865 MH |
919 | skb->len + ETH_HLEN); |
920 | ||
c6c8fea2 | 921 | /* route it */ |
9455e34c | 922 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 923 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 924 | |
44524fcd ML |
925 | out: |
926 | if (neigh_node) | |
7d211efc | 927 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 928 | if (orig_node) |
7d211efc | 929 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 930 | return ret; |
c6c8fea2 SE |
931 | } |
932 | ||
56303d34 | 933 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
63b01037 | 934 | struct sk_buff *skb) { |
a73105b8 | 935 | uint8_t curr_ttvn; |
56303d34 | 936 | struct batadv_orig_node *orig_node; |
a73105b8 | 937 | struct ethhdr *ethhdr; |
56303d34 | 938 | struct batadv_hard_iface *primary_if; |
96412690 | 939 | struct batadv_unicast_packet *unicast_packet; |
cc47f66e | 940 | bool tt_poss_change; |
3e34819e | 941 | int is_old_ttvn; |
a73105b8 AQ |
942 | |
943 | /* I could need to modify it */ | |
96412690 | 944 | if (skb_cow(skb, sizeof(struct batadv_unicast_packet)) < 0) |
a73105b8 AQ |
945 | return 0; |
946 | ||
96412690 | 947 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a73105b8 | 948 | |
3193e8fd | 949 | if (batadv_is_my_mac(unicast_packet->dest)) { |
807736f6 SE |
950 | tt_poss_change = bat_priv->tt.poss_change; |
951 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
cc47f66e | 952 | } else { |
da641193 SE |
953 | orig_node = batadv_orig_hash_find(bat_priv, |
954 | unicast_packet->dest); | |
a73105b8 AQ |
955 | |
956 | if (!orig_node) | |
957 | return 0; | |
958 | ||
959 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 960 | tt_poss_change = orig_node->tt_poss_change; |
7d211efc | 961 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
962 | } |
963 | ||
964 | /* Check whether I have to reroute the packet */ | |
3e34819e SE |
965 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
966 | if (is_old_ttvn || tt_poss_change) { | |
8710e261 | 967 | /* check if there is enough data before accessing it */ |
96412690 | 968 | if (pskb_may_pull(skb, sizeof(struct batadv_unicast_packet) + |
8710e261 | 969 | ETH_HLEN) < 0) |
a73105b8 AQ |
970 | return 0; |
971 | ||
0aca2369 | 972 | ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet)); |
3275e7cc AQ |
973 | |
974 | /* we don't have an updated route for this client, so we should | |
975 | * not try to reroute the packet!! | |
976 | */ | |
08c36d3e SE |
977 | if (batadv_tt_global_client_is_roaming(bat_priv, |
978 | ethhdr->h_dest)) | |
3275e7cc AQ |
979 | return 1; |
980 | ||
08c36d3e SE |
981 | orig_node = batadv_transtable_search(bat_priv, NULL, |
982 | ethhdr->h_dest); | |
a73105b8 AQ |
983 | |
984 | if (!orig_node) { | |
08c36d3e | 985 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) |
a73105b8 | 986 | return 0; |
e5d89254 | 987 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
988 | if (!primary_if) |
989 | return 0; | |
990 | memcpy(unicast_packet->dest, | |
991 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 992 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
993 | } else { |
994 | memcpy(unicast_packet->dest, orig_node->orig, | |
995 | ETH_ALEN); | |
996 | curr_ttvn = (uint8_t) | |
997 | atomic_read(&orig_node->last_ttvn); | |
7d211efc | 998 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
999 | } |
1000 | ||
39c75a51 | 1001 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
1002 | "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n", |
1003 | unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest, | |
1004 | unicast_packet->dest); | |
a73105b8 AQ |
1005 | |
1006 | unicast_packet->ttvn = curr_ttvn; | |
1007 | } | |
1008 | return 1; | |
1009 | } | |
1010 | ||
56303d34 SE |
1011 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
1012 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1013 | { |
56303d34 | 1014 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1015 | struct batadv_unicast_packet *unicast_packet; |
704509b8 | 1016 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 | 1017 | |
63b01037 | 1018 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1019 | return NET_RX_DROP; |
1020 | ||
63b01037 | 1021 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1022 | return NET_RX_DROP; |
1023 | ||
96412690 | 1024 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
1025 | |
1026 | /* packet for me */ | |
3193e8fd | 1027 | if (batadv_is_my_mac(unicast_packet->dest)) { |
04b482a2 SE |
1028 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, |
1029 | hdr_size); | |
c6c8fea2 SE |
1030 | return NET_RX_SUCCESS; |
1031 | } | |
1032 | ||
63b01037 | 1033 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1034 | } |
1035 | ||
30d3c511 | 1036 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1037 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1038 | { |
56303d34 | 1039 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1040 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1041 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1042 | struct sk_buff *new_skb = NULL; |
1043 | int ret; | |
1044 | ||
63b01037 | 1045 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1046 | return NET_RX_DROP; |
1047 | ||
63b01037 | 1048 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1049 | return NET_RX_DROP; |
1050 | ||
96412690 | 1051 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1052 | |
1053 | /* packet for me */ | |
3193e8fd | 1054 | if (batadv_is_my_mac(unicast_packet->dest)) { |
c6c8fea2 | 1055 | |
88ed1e77 | 1056 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1057 | |
1058 | if (ret == NET_RX_DROP) | |
1059 | return NET_RX_DROP; | |
1060 | ||
1061 | /* packet was buffered for late merge */ | |
1062 | if (!new_skb) | |
1063 | return NET_RX_SUCCESS; | |
1064 | ||
04b482a2 | 1065 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
96412690 | 1066 | sizeof(struct batadv_unicast_packet)); |
c6c8fea2 SE |
1067 | return NET_RX_SUCCESS; |
1068 | } | |
1069 | ||
63b01037 | 1070 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1071 | } |
1072 | ||
1073 | ||
56303d34 SE |
1074 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1075 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1076 | { |
56303d34 SE |
1077 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1078 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1079 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1080 | struct ethhdr *ethhdr; |
704509b8 | 1081 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1082 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1083 | int32_t seq_diff; |
1084 | ||
1085 | /* drop packet if it has not necessary minimum size */ | |
1086 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1087 | goto out; |
c6c8fea2 SE |
1088 | |
1089 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1090 | ||
1091 | /* packet with broadcast indication but unicast recipient */ | |
1092 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1093 | goto out; |
c6c8fea2 SE |
1094 | |
1095 | /* packet with broadcast sender address */ | |
1096 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1097 | goto out; |
c6c8fea2 SE |
1098 | |
1099 | /* ignore broadcasts sent by myself */ | |
3193e8fd | 1100 | if (batadv_is_my_mac(ethhdr->h_source)) |
f3e0008f | 1101 | goto out; |
c6c8fea2 | 1102 | |
96412690 | 1103 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1104 | |
1105 | /* ignore broadcasts originated by myself */ | |
3193e8fd | 1106 | if (batadv_is_my_mac(bcast_packet->orig)) |
f3e0008f | 1107 | goto out; |
c6c8fea2 | 1108 | |
76543d14 | 1109 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1110 | goto out; |
c6c8fea2 | 1111 | |
da641193 | 1112 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1113 | |
1114 | if (!orig_node) | |
b5a6f69c | 1115 | goto out; |
c6c8fea2 | 1116 | |
f3e0008f | 1117 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1118 | |
1119 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1120 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1121 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1122 | goto spin_unlock; |
c6c8fea2 SE |
1123 | |
1124 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1125 | ||
1126 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1127 | if (batadv_window_protected(bat_priv, seq_diff, |
1128 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1129 | goto spin_unlock; |
c6c8fea2 SE |
1130 | |
1131 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1132 | * if required. |
1133 | */ | |
0f5f9322 | 1134 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1135 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1136 | ||
f3e0008f | 1137 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1138 | |
fe2da6ff | 1139 | /* check whether this has been sent by another originator before */ |
08adf151 | 1140 | if (batadv_bla_check_bcast_duplist(bat_priv, bcast_packet, hdr_size)) |
fe2da6ff SW |
1141 | goto out; |
1142 | ||
c6c8fea2 | 1143 | /* rebroadcast packet */ |
9455e34c | 1144 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1145 | |
23721387 SW |
1146 | /* don't hand the broadcast up if it is from an originator |
1147 | * from the same backbone. | |
1148 | */ | |
08adf151 | 1149 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1150 | goto out; |
1151 | ||
c6c8fea2 | 1152 | /* broadcast for me */ |
04b482a2 | 1153 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
f3e0008f ML |
1154 | ret = NET_RX_SUCCESS; |
1155 | goto out; | |
c6c8fea2 | 1156 | |
f3e0008f ML |
1157 | spin_unlock: |
1158 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1159 | out: |
1160 | if (orig_node) | |
7d211efc | 1161 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1162 | return ret; |
c6c8fea2 SE |
1163 | } |
1164 | ||
56303d34 SE |
1165 | int batadv_recv_vis_packet(struct sk_buff *skb, |
1166 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1167 | { |
96412690 | 1168 | struct batadv_vis_packet *vis_packet; |
c6c8fea2 | 1169 | struct ethhdr *ethhdr; |
56303d34 | 1170 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704509b8 | 1171 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1172 | |
1173 | /* keep skb linear */ | |
1174 | if (skb_linearize(skb) < 0) | |
1175 | return NET_RX_DROP; | |
1176 | ||
1177 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1178 | return NET_RX_DROP; | |
1179 | ||
96412690 | 1180 | vis_packet = (struct batadv_vis_packet *)skb->data; |
c6c8fea2 SE |
1181 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
1182 | ||
1183 | /* not for me */ | |
3193e8fd | 1184 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
1185 | return NET_RX_DROP; |
1186 | ||
1187 | /* ignore own packets */ | |
3193e8fd | 1188 | if (batadv_is_my_mac(vis_packet->vis_orig)) |
c6c8fea2 SE |
1189 | return NET_RX_DROP; |
1190 | ||
3193e8fd | 1191 | if (batadv_is_my_mac(vis_packet->sender_orig)) |
c6c8fea2 SE |
1192 | return NET_RX_DROP; |
1193 | ||
1194 | switch (vis_packet->vis_type) { | |
acd34afa | 1195 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1196 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1197 | skb_headlen(skb)); | |
c6c8fea2 SE |
1198 | break; |
1199 | ||
acd34afa | 1200 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1201 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1202 | skb_headlen(skb)); | |
c6c8fea2 SE |
1203 | break; |
1204 | ||
1205 | default: /* ignore unknown packet */ | |
1206 | break; | |
1207 | } | |
1208 | ||
1209 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1210 | * always free the skbuf. |
1211 | */ | |
c6c8fea2 SE |
1212 | return NET_RX_DROP; |
1213 | } |