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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 SE |
32 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
33 | struct hard_iface *recv_if); | |
a7f6ee94 | 34 | |
30d3c511 | 35 | void batadv_slide_own_bcast_window(struct hard_iface *hard_iface) |
c6c8fea2 | 36 | { |
e6c10f43 | 37 | struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
c6c8fea2 | 38 | struct hashtable_t *hash = bat_priv->orig_hash; |
7aadf889 | 39 | struct hlist_node *node; |
c6c8fea2 | 40 | struct hlist_head *head; |
c6c8fea2 SE |
41 | struct orig_node *orig_node; |
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 | ||
63b01037 SE |
65 | static void _batadv_update_route(struct bat_priv *bat_priv, |
66 | struct orig_node *orig_node, | |
67 | struct neigh_node *neigh_node) | |
c6c8fea2 | 68 | { |
e1a5382f LL |
69 | struct neigh_node *curr_router; |
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)) { |
1eda58bf SE |
75 | batadv_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", |
76 | 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 | |
1eda58bf SE |
83 | batadv_dbg(DBG_ROUTES, bat_priv, |
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) { |
1eda58bf SE |
88 | batadv_dbg(DBG_ROUTES, bat_priv, |
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 | ||
30d3c511 SE |
110 | void batadv_update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, |
111 | struct neigh_node *neigh_node) | |
c6c8fea2 | 112 | { |
e1a5382f | 113 | struct 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 */ |
30d3c511 SE |
129 | void batadv_bonding_candidate_del(struct orig_node *orig_node, |
130 | struct 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 | ||
30d3c511 SE |
145 | void batadv_bonding_candidate_add(struct orig_node *orig_node, |
146 | struct neigh_node *neigh_node) | |
a4c135c5 SW |
147 | { |
148 | struct hlist_node *node; | |
e1a5382f LL |
149 | struct neigh_node *tmp_neigh_node, *router = NULL; |
150 | uint8_t interference_candidate = 0; | |
a4c135c5 SW |
151 | |
152 | spin_lock_bh(&orig_node->neigh_list_lock); | |
153 | ||
154 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
155 | if (!batadv_compare_eth(orig_node->orig, |
156 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
157 | goto candidate_del; |
158 | ||
7d211efc | 159 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 160 | if (!router) |
a4c135c5 SW |
161 | goto candidate_del; |
162 | ||
a4c135c5 | 163 | /* ... and is good enough to be considered */ |
42d0b044 | 164 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
165 | goto candidate_del; |
166 | ||
9cfc7bd6 | 167 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
168 | * interface. If we do, we won't select this candidate because of |
169 | * possible interference. | |
170 | */ | |
171 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
172 | &orig_node->neigh_list, list) { | |
173 | ||
174 | if (tmp_neigh_node == neigh_node) | |
175 | continue; | |
176 | ||
177 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
178 | * considered as candidate. |
179 | */ | |
a4c135c5 SW |
180 | if (list_empty(&tmp_neigh_node->bonding_list)) |
181 | continue; | |
182 | ||
183 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
184 | (batadv_compare_eth(neigh_node->addr, |
185 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
186 | interference_candidate = 1; |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | /* don't care further if it is an interference candidate */ | |
192 | if (interference_candidate) | |
193 | goto candidate_del; | |
194 | ||
195 | /* this neighbor already is part of our candidate list */ | |
196 | if (!list_empty(&neigh_node->bonding_list)) | |
197 | goto out; | |
198 | ||
44524fcd ML |
199 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
200 | goto out; | |
201 | ||
a4c135c5 | 202 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
203 | atomic_inc(&orig_node->bond_candidates); |
204 | goto out; | |
205 | ||
206 | candidate_del: | |
30d3c511 | 207 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
208 | |
209 | out: | |
210 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
211 | |
212 | if (router) | |
7d211efc | 213 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
214 | } |
215 | ||
216 | /* copy primary address for bonding */ | |
30d3c511 SE |
217 | void |
218 | batadv_bonding_save_primary(const struct orig_node *orig_node, | |
219 | struct orig_node *orig_neigh_node, | |
220 | const struct batman_ogm_packet *batman_ogm_packet) | |
a4c135c5 | 221 | { |
acd34afa | 222 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
223 | return; |
224 | ||
225 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
226 | } | |
227 | ||
c6c8fea2 SE |
228 | /* checks whether the host restarted and is in the protection time. |
229 | * returns: | |
230 | * 0 if the packet is to be accepted | |
231 | * 1 if the packet is to be ignored. | |
232 | */ | |
30d3c511 SE |
233 | int batadv_window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, |
234 | unsigned long *last_reset) | |
c6c8fea2 | 235 | { |
42d0b044 SE |
236 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
237 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
238 | if (!batadv_has_timed_out(*last_reset, | |
239 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 240 | return 1; |
8c7bf248 ML |
241 | |
242 | *last_reset = jiffies; | |
1eda58bf SE |
243 | batadv_dbg(DBG_BATMAN, bat_priv, |
244 | "old packet received, start protection\n"); | |
c6c8fea2 | 245 | } |
8c7bf248 | 246 | |
c6c8fea2 SE |
247 | return 0; |
248 | } | |
249 | ||
30d3c511 SE |
250 | bool batadv_check_management_packet(struct sk_buff *skb, |
251 | struct hard_iface *hard_iface, | |
252 | int header_len) | |
c6c8fea2 | 253 | { |
c6c8fea2 SE |
254 | struct ethhdr *ethhdr; |
255 | ||
256 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
257 | if (unlikely(!pskb_may_pull(skb, header_len))) |
258 | return false; | |
c6c8fea2 SE |
259 | |
260 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
261 | ||
262 | /* packet with broadcast indication but unicast recipient */ | |
263 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 264 | return false; |
c6c8fea2 SE |
265 | |
266 | /* packet with broadcast sender address */ | |
267 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 268 | return false; |
c6c8fea2 SE |
269 | |
270 | /* create a copy of the skb, if needed, to modify it. */ | |
271 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 272 | return false; |
c6c8fea2 SE |
273 | |
274 | /* keep skb linear */ | |
275 | if (skb_linearize(skb) < 0) | |
c3e29312 | 276 | return false; |
c6c8fea2 | 277 | |
c3e29312 | 278 | return true; |
c6c8fea2 SE |
279 | } |
280 | ||
63b01037 SE |
281 | static int batadv_recv_my_icmp_packet(struct bat_priv *bat_priv, |
282 | struct sk_buff *skb, size_t icmp_len) | |
c6c8fea2 | 283 | { |
32ae9b22 | 284 | struct hard_iface *primary_if = NULL; |
44524fcd | 285 | struct orig_node *orig_node = NULL; |
e1a5382f | 286 | struct neigh_node *router = NULL; |
c6c8fea2 | 287 | struct icmp_packet_rr *icmp_packet; |
44524fcd | 288 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
289 | |
290 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
c6c8fea2 SE |
291 | |
292 | /* add data to device queue */ | |
acd34afa | 293 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
9039dc7e | 294 | batadv_socket_receive_packet(icmp_packet, icmp_len); |
44524fcd | 295 | goto out; |
c6c8fea2 SE |
296 | } |
297 | ||
e5d89254 | 298 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 299 | if (!primary_if) |
44524fcd | 300 | goto out; |
c6c8fea2 SE |
301 | |
302 | /* answer echo request (ping) */ | |
303 | /* get routing information */ | |
da641193 | 304 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 305 | if (!orig_node) |
e1a5382f | 306 | goto out; |
c6c8fea2 | 307 | |
7d211efc | 308 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
309 | if (!router) |
310 | goto out; | |
c6c8fea2 | 311 | |
44524fcd | 312 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 313 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
314 | goto out; |
315 | ||
316 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
317 | ||
318 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 319 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 320 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 321 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 322 | |
9455e34c | 323 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 324 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 325 | |
44524fcd | 326 | out: |
32ae9b22 | 327 | if (primary_if) |
e5d89254 | 328 | batadv_hardif_free_ref(primary_if); |
e1a5382f | 329 | if (router) |
7d211efc | 330 | batadv_neigh_node_free_ref(router); |
44524fcd | 331 | if (orig_node) |
7d211efc | 332 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
333 | return ret; |
334 | } | |
335 | ||
63b01037 SE |
336 | static int batadv_recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, |
337 | struct sk_buff *skb) | |
c6c8fea2 | 338 | { |
32ae9b22 | 339 | struct hard_iface *primary_if = NULL; |
44524fcd | 340 | struct orig_node *orig_node = NULL; |
e1a5382f | 341 | struct neigh_node *router = NULL; |
c6c8fea2 | 342 | struct icmp_packet *icmp_packet; |
44524fcd | 343 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
344 | |
345 | icmp_packet = (struct icmp_packet *)skb->data; | |
c6c8fea2 SE |
346 | |
347 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 348 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
349 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
350 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 351 | goto out; |
c6c8fea2 SE |
352 | } |
353 | ||
e5d89254 | 354 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 355 | if (!primary_if) |
44524fcd | 356 | goto out; |
c6c8fea2 SE |
357 | |
358 | /* get routing information */ | |
da641193 | 359 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 360 | if (!orig_node) |
e1a5382f | 361 | goto out; |
c6c8fea2 | 362 | |
7d211efc | 363 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
364 | if (!router) |
365 | goto out; | |
c6c8fea2 | 366 | |
44524fcd | 367 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 368 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 369 | goto out; |
c6c8fea2 | 370 | |
44524fcd | 371 | icmp_packet = (struct icmp_packet *)skb->data; |
c6c8fea2 | 372 | |
44524fcd | 373 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 374 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 375 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 376 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 377 | |
9455e34c | 378 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 379 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 380 | |
44524fcd | 381 | out: |
32ae9b22 | 382 | if (primary_if) |
e5d89254 | 383 | batadv_hardif_free_ref(primary_if); |
e1a5382f | 384 | if (router) |
7d211efc | 385 | batadv_neigh_node_free_ref(router); |
44524fcd | 386 | if (orig_node) |
7d211efc | 387 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
388 | return ret; |
389 | } | |
390 | ||
391 | ||
30d3c511 | 392 | int batadv_recv_icmp_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
393 | { |
394 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
395 | struct icmp_packet_rr *icmp_packet; | |
396 | struct ethhdr *ethhdr; | |
44524fcd | 397 | struct orig_node *orig_node = NULL; |
e1a5382f | 398 | struct neigh_node *router = NULL; |
c6c8fea2 | 399 | int hdr_size = sizeof(struct icmp_packet); |
44524fcd | 400 | int ret = NET_RX_DROP; |
c6c8fea2 | 401 | |
9cfc7bd6 | 402 | /* we truncate all incoming icmp packets if they don't match our size */ |
c6c8fea2 SE |
403 | if (skb->len >= sizeof(struct icmp_packet_rr)) |
404 | hdr_size = sizeof(struct icmp_packet_rr); | |
405 | ||
406 | /* drop packet if it has not necessary minimum size */ | |
407 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 408 | goto out; |
c6c8fea2 SE |
409 | |
410 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
411 | ||
412 | /* packet with unicast indication but broadcast recipient */ | |
413 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 414 | goto out; |
c6c8fea2 SE |
415 | |
416 | /* packet with broadcast sender address */ | |
417 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 418 | goto out; |
c6c8fea2 SE |
419 | |
420 | /* not for me */ | |
3193e8fd | 421 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
44524fcd | 422 | goto out; |
c6c8fea2 SE |
423 | |
424 | icmp_packet = (struct icmp_packet_rr *)skb->data; | |
425 | ||
426 | /* add record route information if not full */ | |
427 | if ((hdr_size == sizeof(struct icmp_packet_rr)) && | |
7e071c79 | 428 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 429 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 430 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
431 | icmp_packet->rr_cur++; |
432 | } | |
433 | ||
434 | /* packet for me */ | |
3193e8fd | 435 | if (batadv_is_my_mac(icmp_packet->dst)) |
63b01037 | 436 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
437 | |
438 | /* TTL exceeded */ | |
76543d14 | 439 | if (icmp_packet->header.ttl < 2) |
63b01037 | 440 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 441 | |
c6c8fea2 | 442 | /* get routing information */ |
da641193 | 443 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 444 | if (!orig_node) |
e1a5382f | 445 | goto out; |
c6c8fea2 | 446 | |
7d211efc | 447 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f LL |
448 | if (!router) |
449 | goto out; | |
c6c8fea2 | 450 | |
44524fcd | 451 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 452 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 453 | goto out; |
c6c8fea2 | 454 | |
44524fcd | 455 | icmp_packet = (struct icmp_packet_rr *)skb->data; |
c6c8fea2 | 456 | |
44524fcd | 457 | /* decrement ttl */ |
76543d14 | 458 | icmp_packet->header.ttl--; |
44524fcd ML |
459 | |
460 | /* route it */ | |
9455e34c | 461 | batadv_send_skb_packet(skb, router->if_incoming, router->addr); |
44524fcd | 462 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 463 | |
44524fcd | 464 | out: |
e1a5382f | 465 | if (router) |
7d211efc | 466 | batadv_neigh_node_free_ref(router); |
44524fcd | 467 | if (orig_node) |
7d211efc | 468 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
469 | return ret; |
470 | } | |
471 | ||
55158629 LL |
472 | /* In the bonding case, send the packets in a round |
473 | * robin fashion over the remaining interfaces. | |
474 | * | |
475 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
476 | * returned router's refcount. |
477 | */ | |
63b01037 SE |
478 | static struct neigh_node * |
479 | batadv_find_bond_router(struct orig_node *primary_orig, | |
480 | const struct hard_iface *recv_if) | |
55158629 LL |
481 | { |
482 | struct neigh_node *tmp_neigh_node; | |
483 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
484 | ||
485 | rcu_read_lock(); | |
486 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
487 | bonding_list) { | |
488 | if (!first_candidate) | |
489 | first_candidate = tmp_neigh_node; | |
490 | ||
491 | /* recv_if == NULL on the first node. */ | |
492 | if (tmp_neigh_node->if_incoming == recv_if) | |
493 | continue; | |
494 | ||
495 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
496 | continue; | |
497 | ||
498 | router = tmp_neigh_node; | |
499 | break; | |
500 | } | |
501 | ||
502 | /* use the first candidate if nothing was found. */ | |
503 | if (!router && first_candidate && | |
504 | atomic_inc_not_zero(&first_candidate->refcount)) | |
505 | router = first_candidate; | |
506 | ||
507 | if (!router) | |
508 | goto out; | |
509 | ||
510 | /* selected should point to the next element | |
9cfc7bd6 SE |
511 | * after the current router |
512 | */ | |
55158629 LL |
513 | spin_lock_bh(&primary_orig->neigh_list_lock); |
514 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
515 | * does not exist as rcu version |
516 | */ | |
55158629 LL |
517 | list_del_rcu(&primary_orig->bond_list); |
518 | list_add_rcu(&primary_orig->bond_list, | |
519 | &router->bonding_list); | |
520 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
521 | ||
522 | out: | |
523 | rcu_read_unlock(); | |
524 | return router; | |
525 | } | |
526 | ||
527 | /* Interface Alternating: Use the best of the | |
528 | * remaining candidates which are not using | |
529 | * this interface. | |
530 | * | |
9cfc7bd6 SE |
531 | * Increases the returned router's refcount |
532 | */ | |
63b01037 SE |
533 | static struct neigh_node * |
534 | batadv_find_ifalter_router(struct orig_node *primary_orig, | |
535 | const struct hard_iface *recv_if) | |
55158629 LL |
536 | { |
537 | struct neigh_node *tmp_neigh_node; | |
538 | struct neigh_node *router = NULL, *first_candidate = NULL; | |
539 | ||
540 | rcu_read_lock(); | |
541 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
542 | bonding_list) { | |
543 | if (!first_candidate) | |
544 | first_candidate = tmp_neigh_node; | |
545 | ||
546 | /* recv_if == NULL on the first node. */ | |
547 | if (tmp_neigh_node->if_incoming == recv_if) | |
548 | continue; | |
549 | ||
550 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
551 | continue; | |
552 | ||
553 | /* if we don't have a router yet | |
9cfc7bd6 SE |
554 | * or this one is better, choose it. |
555 | */ | |
55158629 LL |
556 | if ((!router) || |
557 | (tmp_neigh_node->tq_avg > router->tq_avg)) { | |
558 | /* decrement refcount of | |
9cfc7bd6 SE |
559 | * previously selected router |
560 | */ | |
55158629 | 561 | if (router) |
7d211efc | 562 | batadv_neigh_node_free_ref(router); |
55158629 LL |
563 | |
564 | router = tmp_neigh_node; | |
565 | atomic_inc_not_zero(&router->refcount); | |
566 | } | |
567 | ||
7d211efc | 568 | batadv_neigh_node_free_ref(tmp_neigh_node); |
55158629 LL |
569 | } |
570 | ||
571 | /* use the first candidate if nothing was found. */ | |
572 | if (!router && first_candidate && | |
573 | atomic_inc_not_zero(&first_candidate->refcount)) | |
574 | router = first_candidate; | |
575 | ||
576 | rcu_read_unlock(); | |
577 | return router; | |
578 | } | |
579 | ||
30d3c511 | 580 | int batadv_recv_tt_query(struct sk_buff *skb, struct hard_iface *recv_if) |
a73105b8 AQ |
581 | { |
582 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
583 | struct tt_query_packet *tt_query; | |
f25bd58a | 584 | uint16_t tt_size; |
a73105b8 | 585 | struct ethhdr *ethhdr; |
1eda58bf | 586 | char tt_flag; |
a73105b8 AQ |
587 | |
588 | /* drop packet if it has not necessary minimum size */ | |
589 | if (unlikely(!pskb_may_pull(skb, sizeof(struct tt_query_packet)))) | |
590 | goto out; | |
591 | ||
592 | /* I could need to modify it */ | |
593 | if (skb_cow(skb, sizeof(struct tt_query_packet)) < 0) | |
594 | goto out; | |
595 | ||
596 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
597 | ||
598 | /* packet with unicast indication but broadcast recipient */ | |
599 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
600 | goto out; | |
601 | ||
602 | /* packet with broadcast sender address */ | |
603 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
604 | goto out; | |
605 | ||
606 | tt_query = (struct tt_query_packet *)skb->data; | |
607 | ||
7e071c79 | 608 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 609 | case BATADV_TT_REQUEST: |
d69909d2 | 610 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 611 | |
a73105b8 | 612 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
613 | * forwarded |
614 | */ | |
08c36d3e | 615 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
616 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
617 | tt_flag = 'F'; | |
618 | else | |
619 | tt_flag = '.'; | |
620 | ||
1eda58bf SE |
621 | batadv_dbg(DBG_TT, bat_priv, |
622 | "Routing TT_REQUEST to %pM [%c]\n", | |
623 | tt_query->dst, | |
624 | tt_flag); | |
63b01037 | 625 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
626 | } |
627 | break; | |
acd34afa | 628 | case BATADV_TT_RESPONSE: |
d69909d2 | 629 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 630 | |
3193e8fd | 631 | if (batadv_is_my_mac(tt_query->dst)) { |
dc58fe32 | 632 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
633 | * changes |
634 | */ | |
dc58fe32 AQ |
635 | if (skb_linearize(skb) < 0) |
636 | goto out; | |
d2b6cc8e AQ |
637 | /* skb_linearize() possibly changed skb->data */ |
638 | tt_query = (struct tt_query_packet *)skb->data; | |
a73105b8 | 639 | |
08c36d3e | 640 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
641 | |
642 | /* Ensure we have all the claimed data */ | |
643 | if (unlikely(skb_headlen(skb) < | |
f25bd58a | 644 | sizeof(struct tt_query_packet) + tt_size)) |
8b7342d6 AQ |
645 | goto out; |
646 | ||
08c36d3e | 647 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 648 | } else { |
acd34afa SE |
649 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
650 | tt_flag = 'F'; | |
651 | else | |
652 | tt_flag = '.'; | |
1eda58bf SE |
653 | batadv_dbg(DBG_TT, bat_priv, |
654 | "Routing TT_RESPONSE to %pM [%c]\n", | |
655 | tt_query->dst, | |
656 | tt_flag); | |
63b01037 | 657 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
658 | } |
659 | break; | |
660 | } | |
661 | ||
662 | out: | |
663 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
664 | return NET_RX_DROP; | |
665 | } | |
666 | ||
30d3c511 | 667 | int batadv_recv_roam_adv(struct sk_buff *skb, struct hard_iface *recv_if) |
cc47f66e AQ |
668 | { |
669 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
670 | struct roam_adv_packet *roam_adv_packet; | |
671 | struct orig_node *orig_node; | |
672 | struct ethhdr *ethhdr; | |
673 | ||
674 | /* drop packet if it has not necessary minimum size */ | |
675 | if (unlikely(!pskb_may_pull(skb, sizeof(struct roam_adv_packet)))) | |
676 | goto out; | |
677 | ||
678 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
679 | ||
680 | /* packet with unicast indication but broadcast recipient */ | |
681 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
682 | goto out; | |
683 | ||
684 | /* packet with broadcast sender address */ | |
685 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
686 | goto out; | |
687 | ||
d69909d2 | 688 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 689 | |
cc47f66e AQ |
690 | roam_adv_packet = (struct roam_adv_packet *)skb->data; |
691 | ||
3193e8fd | 692 | if (!batadv_is_my_mac(roam_adv_packet->dst)) |
63b01037 | 693 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 694 | |
20ff9d59 SW |
695 | /* check if it is a backbone gateway. we don't accept |
696 | * roaming advertisement from it, as it has the same | |
697 | * entries as we have. | |
698 | */ | |
08adf151 | 699 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
700 | goto out; |
701 | ||
da641193 | 702 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
703 | if (!orig_node) |
704 | goto out; | |
705 | ||
1eda58bf SE |
706 | batadv_dbg(DBG_TT, bat_priv, |
707 | "Received ROAMING_ADV from %pM (client %pM)\n", | |
708 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 709 | |
08c36d3e | 710 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 711 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 712 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e AQ |
713 | |
714 | /* Roaming phase starts: I have new information but the ttvn has not | |
715 | * been incremented yet. This flag will make me check all the incoming | |
9cfc7bd6 SE |
716 | * packets for the correct destination. |
717 | */ | |
cc47f66e AQ |
718 | bat_priv->tt_poss_change = true; |
719 | ||
7d211efc | 720 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
721 | out: |
722 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
723 | return NET_RX_DROP; | |
724 | } | |
725 | ||
c6c8fea2 | 726 | /* find a suitable router for this originator, and use |
a4c135c5 | 727 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
728 | * refcount. |
729 | */ | |
30d3c511 SE |
730 | struct neigh_node *batadv_find_router(struct bat_priv *bat_priv, |
731 | struct orig_node *orig_node, | |
732 | const struct hard_iface *recv_if) | |
c6c8fea2 SE |
733 | { |
734 | struct orig_node *primary_orig_node; | |
735 | struct orig_node *router_orig; | |
55158629 | 736 | struct neigh_node *router; |
c6c8fea2 SE |
737 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
738 | int bonding_enabled; | |
da641193 | 739 | uint8_t *primary_addr; |
c6c8fea2 SE |
740 | |
741 | if (!orig_node) | |
742 | return NULL; | |
743 | ||
7d211efc | 744 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 745 | if (!router) |
01df2b65 | 746 | goto err; |
c6c8fea2 SE |
747 | |
748 | /* without bonding, the first node should | |
9cfc7bd6 SE |
749 | * always choose the default router. |
750 | */ | |
c6c8fea2 SE |
751 | bonding_enabled = atomic_read(&bat_priv->bonding); |
752 | ||
a4c135c5 SW |
753 | rcu_read_lock(); |
754 | /* select default router to output */ | |
e1a5382f | 755 | router_orig = router->orig_node; |
01df2b65 ML |
756 | if (!router_orig) |
757 | goto err_unlock; | |
a4c135c5 | 758 | |
a4c135c5 SW |
759 | if ((!recv_if) && (!bonding_enabled)) |
760 | goto return_router; | |
c6c8fea2 | 761 | |
da641193 SE |
762 | primary_addr = router_orig->primary_addr; |
763 | ||
c6c8fea2 | 764 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
765 | * for a potential bonding candidate. |
766 | */ | |
1eda58bf | 767 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 768 | goto return_router; |
c6c8fea2 SE |
769 | |
770 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
771 | * even be the same as our router_orig in many cases |
772 | */ | |
1eda58bf | 773 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
774 | primary_orig_node = router_orig; |
775 | } else { | |
da641193 SE |
776 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
777 | primary_addr); | |
c6c8fea2 | 778 | if (!primary_orig_node) |
a4c135c5 | 779 | goto return_router; |
7aadf889 | 780 | |
7d211efc | 781 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
782 | } |
783 | ||
784 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
785 | * bonding and prefer the original router. |
786 | */ | |
a4c135c5 SW |
787 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
788 | goto return_router; | |
c6c8fea2 | 789 | |
c6c8fea2 SE |
790 | /* all nodes between should choose a candidate which |
791 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
792 | * in. |
793 | */ | |
7d211efc | 794 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 795 | |
55158629 | 796 | if (bonding_enabled) |
63b01037 | 797 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 798 | else |
63b01037 | 799 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 800 | |
a4c135c5 | 801 | return_router: |
e9a4f295 | 802 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
803 | goto err_unlock; |
804 | ||
a4c135c5 | 805 | rcu_read_unlock(); |
c6c8fea2 | 806 | return router; |
01df2b65 ML |
807 | err_unlock: |
808 | rcu_read_unlock(); | |
809 | err: | |
810 | if (router) | |
7d211efc | 811 | batadv_neigh_node_free_ref(router); |
01df2b65 | 812 | return NULL; |
c6c8fea2 SE |
813 | } |
814 | ||
63b01037 | 815 | static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) |
c6c8fea2 SE |
816 | { |
817 | struct ethhdr *ethhdr; | |
818 | ||
819 | /* drop packet if it has not necessary minimum size */ | |
820 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
821 | return -1; | |
822 | ||
823 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
824 | ||
825 | /* packet with unicast indication but broadcast recipient */ | |
826 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
827 | return -1; | |
828 | ||
829 | /* packet with broadcast sender address */ | |
830 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
831 | return -1; | |
832 | ||
833 | /* not for me */ | |
3193e8fd | 834 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
835 | return -1; |
836 | ||
837 | return 0; | |
838 | } | |
839 | ||
63b01037 SE |
840 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
841 | struct hard_iface *recv_if) | |
c6c8fea2 SE |
842 | { |
843 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
44524fcd ML |
844 | struct orig_node *orig_node = NULL; |
845 | struct neigh_node *neigh_node = NULL; | |
c6c8fea2 SE |
846 | struct unicast_packet *unicast_packet; |
847 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
44524fcd | 848 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
849 | struct sk_buff *new_skb; |
850 | ||
851 | unicast_packet = (struct unicast_packet *)skb->data; | |
852 | ||
853 | /* TTL exceeded */ | |
76543d14 | 854 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
855 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
856 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 857 | goto out; |
c6c8fea2 SE |
858 | } |
859 | ||
860 | /* get routing information */ | |
da641193 | 861 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 862 | |
44524fcd | 863 | if (!orig_node) |
b5a6f69c | 864 | goto out; |
c6c8fea2 | 865 | |
a4c135c5 | 866 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 867 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 868 | |
d0072609 | 869 | if (!neigh_node) |
44524fcd | 870 | goto out; |
c6c8fea2 SE |
871 | |
872 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 873 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 874 | goto out; |
c6c8fea2 SE |
875 | |
876 | unicast_packet = (struct unicast_packet *)skb->data; | |
877 | ||
acd34afa | 878 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 879 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 880 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
881 | ret = batadv_frag_send_skb(skb, bat_priv, |
882 | neigh_node->if_incoming, | |
883 | neigh_node->addr); | |
d0072609 ML |
884 | goto out; |
885 | } | |
c6c8fea2 | 886 | |
acd34afa | 887 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
888 | batadv_frag_can_reassemble(skb, |
889 | neigh_node->if_incoming->net_dev->mtu)) { | |
c6c8fea2 | 890 | |
88ed1e77 | 891 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
892 | |
893 | if (ret == NET_RX_DROP) | |
44524fcd | 894 | goto out; |
c6c8fea2 SE |
895 | |
896 | /* packet was buffered for late merge */ | |
44524fcd ML |
897 | if (!new_skb) { |
898 | ret = NET_RX_SUCCESS; | |
899 | goto out; | |
900 | } | |
c6c8fea2 SE |
901 | |
902 | skb = new_skb; | |
903 | unicast_packet = (struct unicast_packet *)skb->data; | |
904 | } | |
905 | ||
906 | /* decrement ttl */ | |
76543d14 | 907 | unicast_packet->header.ttl--; |
c6c8fea2 | 908 | |
f8214865 | 909 | /* Update stats counter */ |
d69909d2 SE |
910 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
911 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
f8214865 MH |
912 | skb->len + ETH_HLEN); |
913 | ||
c6c8fea2 | 914 | /* route it */ |
9455e34c | 915 | batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); |
44524fcd | 916 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 917 | |
44524fcd ML |
918 | out: |
919 | if (neigh_node) | |
7d211efc | 920 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 921 | if (orig_node) |
7d211efc | 922 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 923 | return ret; |
c6c8fea2 SE |
924 | } |
925 | ||
63b01037 SE |
926 | static int batadv_check_unicast_ttvn(struct bat_priv *bat_priv, |
927 | struct sk_buff *skb) { | |
a73105b8 AQ |
928 | uint8_t curr_ttvn; |
929 | struct orig_node *orig_node; | |
930 | struct ethhdr *ethhdr; | |
931 | struct hard_iface *primary_if; | |
932 | struct unicast_packet *unicast_packet; | |
cc47f66e | 933 | bool tt_poss_change; |
3e34819e | 934 | int is_old_ttvn; |
a73105b8 AQ |
935 | |
936 | /* I could need to modify it */ | |
937 | if (skb_cow(skb, sizeof(struct unicast_packet)) < 0) | |
938 | return 0; | |
939 | ||
940 | unicast_packet = (struct unicast_packet *)skb->data; | |
941 | ||
3193e8fd | 942 | if (batadv_is_my_mac(unicast_packet->dest)) { |
cc47f66e | 943 | tt_poss_change = bat_priv->tt_poss_change; |
a73105b8 | 944 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn); |
cc47f66e | 945 | } else { |
da641193 SE |
946 | orig_node = batadv_orig_hash_find(bat_priv, |
947 | unicast_packet->dest); | |
a73105b8 AQ |
948 | |
949 | if (!orig_node) | |
950 | return 0; | |
951 | ||
952 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
cc47f66e | 953 | tt_poss_change = orig_node->tt_poss_change; |
7d211efc | 954 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
955 | } |
956 | ||
957 | /* Check whether I have to reroute the packet */ | |
3e34819e SE |
958 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
959 | if (is_old_ttvn || tt_poss_change) { | |
8710e261 AQ |
960 | /* check if there is enough data before accessing it */ |
961 | if (pskb_may_pull(skb, sizeof(struct unicast_packet) + | |
962 | ETH_HLEN) < 0) | |
a73105b8 AQ |
963 | return 0; |
964 | ||
965 | ethhdr = (struct ethhdr *)(skb->data + | |
966 | sizeof(struct unicast_packet)); | |
3275e7cc AQ |
967 | |
968 | /* we don't have an updated route for this client, so we should | |
969 | * not try to reroute the packet!! | |
970 | */ | |
08c36d3e SE |
971 | if (batadv_tt_global_client_is_roaming(bat_priv, |
972 | ethhdr->h_dest)) | |
3275e7cc AQ |
973 | return 1; |
974 | ||
08c36d3e SE |
975 | orig_node = batadv_transtable_search(bat_priv, NULL, |
976 | ethhdr->h_dest); | |
a73105b8 AQ |
977 | |
978 | if (!orig_node) { | |
08c36d3e | 979 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) |
a73105b8 | 980 | return 0; |
e5d89254 | 981 | primary_if = batadv_primary_if_get_selected(bat_priv); |
a73105b8 AQ |
982 | if (!primary_if) |
983 | return 0; | |
984 | memcpy(unicast_packet->dest, | |
985 | primary_if->net_dev->dev_addr, ETH_ALEN); | |
e5d89254 | 986 | batadv_hardif_free_ref(primary_if); |
a73105b8 AQ |
987 | } else { |
988 | memcpy(unicast_packet->dest, orig_node->orig, | |
989 | ETH_ALEN); | |
990 | curr_ttvn = (uint8_t) | |
991 | atomic_read(&orig_node->last_ttvn); | |
7d211efc | 992 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
993 | } |
994 | ||
1eda58bf SE |
995 | batadv_dbg(DBG_ROUTES, bat_priv, |
996 | "TTVN mismatch (old_ttvn %u new_ttvn %u)! Rerouting unicast packet (for %pM) to %pM\n", | |
997 | unicast_packet->ttvn, curr_ttvn, ethhdr->h_dest, | |
998 | unicast_packet->dest); | |
a73105b8 AQ |
999 | |
1000 | unicast_packet->ttvn = curr_ttvn; | |
1001 | } | |
1002 | return 1; | |
1003 | } | |
1004 | ||
30d3c511 | 1005 | int batadv_recv_unicast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 | 1006 | { |
a73105b8 | 1007 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
c6c8fea2 | 1008 | struct unicast_packet *unicast_packet; |
704509b8 | 1009 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 | 1010 | |
63b01037 | 1011 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1012 | return NET_RX_DROP; |
1013 | ||
63b01037 | 1014 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1015 | return NET_RX_DROP; |
1016 | ||
c6c8fea2 SE |
1017 | unicast_packet = (struct unicast_packet *)skb->data; |
1018 | ||
1019 | /* packet for me */ | |
3193e8fd | 1020 | if (batadv_is_my_mac(unicast_packet->dest)) { |
04b482a2 SE |
1021 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, |
1022 | hdr_size); | |
c6c8fea2 SE |
1023 | return NET_RX_SUCCESS; |
1024 | } | |
1025 | ||
63b01037 | 1026 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1027 | } |
1028 | ||
30d3c511 SE |
1029 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
1030 | struct hard_iface *recv_if) | |
c6c8fea2 SE |
1031 | { |
1032 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1033 | struct unicast_frag_packet *unicast_packet; | |
704509b8 | 1034 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1035 | struct sk_buff *new_skb = NULL; |
1036 | int ret; | |
1037 | ||
63b01037 | 1038 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1039 | return NET_RX_DROP; |
1040 | ||
63b01037 | 1041 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1042 | return NET_RX_DROP; |
1043 | ||
c6c8fea2 SE |
1044 | unicast_packet = (struct unicast_frag_packet *)skb->data; |
1045 | ||
1046 | /* packet for me */ | |
3193e8fd | 1047 | if (batadv_is_my_mac(unicast_packet->dest)) { |
c6c8fea2 | 1048 | |
88ed1e77 | 1049 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1050 | |
1051 | if (ret == NET_RX_DROP) | |
1052 | return NET_RX_DROP; | |
1053 | ||
1054 | /* packet was buffered for late merge */ | |
1055 | if (!new_skb) | |
1056 | return NET_RX_SUCCESS; | |
1057 | ||
04b482a2 SE |
1058 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
1059 | sizeof(struct unicast_packet)); | |
c6c8fea2 SE |
1060 | return NET_RX_SUCCESS; |
1061 | } | |
1062 | ||
63b01037 | 1063 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1064 | } |
1065 | ||
1066 | ||
30d3c511 | 1067 | int batadv_recv_bcast_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1068 | { |
1069 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
f3e0008f | 1070 | struct orig_node *orig_node = NULL; |
c6c8fea2 SE |
1071 | struct bcast_packet *bcast_packet; |
1072 | struct ethhdr *ethhdr; | |
704509b8 | 1073 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1074 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1075 | int32_t seq_diff; |
1076 | ||
1077 | /* drop packet if it has not necessary minimum size */ | |
1078 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1079 | goto out; |
c6c8fea2 SE |
1080 | |
1081 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1082 | ||
1083 | /* packet with broadcast indication but unicast recipient */ | |
1084 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1085 | goto out; |
c6c8fea2 SE |
1086 | |
1087 | /* packet with broadcast sender address */ | |
1088 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1089 | goto out; |
c6c8fea2 SE |
1090 | |
1091 | /* ignore broadcasts sent by myself */ | |
3193e8fd | 1092 | if (batadv_is_my_mac(ethhdr->h_source)) |
f3e0008f | 1093 | goto out; |
c6c8fea2 SE |
1094 | |
1095 | bcast_packet = (struct bcast_packet *)skb->data; | |
1096 | ||
1097 | /* ignore broadcasts originated by myself */ | |
3193e8fd | 1098 | if (batadv_is_my_mac(bcast_packet->orig)) |
f3e0008f | 1099 | goto out; |
c6c8fea2 | 1100 | |
76543d14 | 1101 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1102 | goto out; |
c6c8fea2 | 1103 | |
da641193 | 1104 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1105 | |
1106 | if (!orig_node) | |
b5a6f69c | 1107 | goto out; |
c6c8fea2 | 1108 | |
f3e0008f | 1109 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1110 | |
1111 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1112 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1113 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1114 | goto spin_unlock; |
c6c8fea2 SE |
1115 | |
1116 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1117 | ||
1118 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1119 | if (batadv_window_protected(bat_priv, seq_diff, |
1120 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1121 | goto spin_unlock; |
c6c8fea2 SE |
1122 | |
1123 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1124 | * if required. |
1125 | */ | |
0f5f9322 | 1126 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1127 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1128 | ||
f3e0008f | 1129 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1130 | |
fe2da6ff | 1131 | /* check whether this has been sent by another originator before */ |
08adf151 | 1132 | if (batadv_bla_check_bcast_duplist(bat_priv, bcast_packet, hdr_size)) |
fe2da6ff SW |
1133 | goto out; |
1134 | ||
c6c8fea2 | 1135 | /* rebroadcast packet */ |
9455e34c | 1136 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1137 | |
23721387 SW |
1138 | /* don't hand the broadcast up if it is from an originator |
1139 | * from the same backbone. | |
1140 | */ | |
08adf151 | 1141 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1142 | goto out; |
1143 | ||
c6c8fea2 | 1144 | /* broadcast for me */ |
04b482a2 | 1145 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); |
f3e0008f ML |
1146 | ret = NET_RX_SUCCESS; |
1147 | goto out; | |
c6c8fea2 | 1148 | |
f3e0008f ML |
1149 | spin_unlock: |
1150 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1151 | out: |
1152 | if (orig_node) | |
7d211efc | 1153 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1154 | return ret; |
c6c8fea2 SE |
1155 | } |
1156 | ||
30d3c511 | 1157 | int batadv_recv_vis_packet(struct sk_buff *skb, struct hard_iface *recv_if) |
c6c8fea2 SE |
1158 | { |
1159 | struct vis_packet *vis_packet; | |
1160 | struct ethhdr *ethhdr; | |
1161 | struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
704509b8 | 1162 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1163 | |
1164 | /* keep skb linear */ | |
1165 | if (skb_linearize(skb) < 0) | |
1166 | return NET_RX_DROP; | |
1167 | ||
1168 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1169 | return NET_RX_DROP; | |
1170 | ||
1171 | vis_packet = (struct vis_packet *)skb->data; | |
1172 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1173 | ||
1174 | /* not for me */ | |
3193e8fd | 1175 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
1176 | return NET_RX_DROP; |
1177 | ||
1178 | /* ignore own packets */ | |
3193e8fd | 1179 | if (batadv_is_my_mac(vis_packet->vis_orig)) |
c6c8fea2 SE |
1180 | return NET_RX_DROP; |
1181 | ||
3193e8fd | 1182 | if (batadv_is_my_mac(vis_packet->sender_orig)) |
c6c8fea2 SE |
1183 | return NET_RX_DROP; |
1184 | ||
1185 | switch (vis_packet->vis_type) { | |
acd34afa | 1186 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1187 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1188 | skb_headlen(skb)); | |
c6c8fea2 SE |
1189 | break; |
1190 | ||
acd34afa | 1191 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1192 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1193 | skb_headlen(skb)); | |
c6c8fea2 SE |
1194 | break; |
1195 | ||
1196 | default: /* ignore unknown packet */ | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1201 | * always free the skbuf. |
1202 | */ | |
c6c8fea2 SE |
1203 | return NET_RX_DROP; |
1204 | } |