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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" |
c384ea3e | 31 | #include "distributed-arp-table.h" |
c6c8fea2 | 32 | |
63b01037 | 33 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 34 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 35 | |
56303d34 | 36 | void batadv_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) |
c6c8fea2 | 37 | { |
56303d34 | 38 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 39 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
7aadf889 | 40 | struct hlist_node *node; |
c6c8fea2 | 41 | struct hlist_head *head; |
56303d34 | 42 | struct batadv_orig_node *orig_node; |
c6c8fea2 | 43 | unsigned long *word; |
c90681b8 | 44 | uint32_t i; |
c6c8fea2 | 45 | size_t word_index; |
42d0b044 | 46 | uint8_t *w; |
c6c8fea2 | 47 | |
c6c8fea2 SE |
48 | for (i = 0; i < hash->size; i++) { |
49 | head = &hash->table[i]; | |
50 | ||
fb778ea1 | 51 | rcu_read_lock(); |
7aadf889 | 52 | hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) { |
2ae2daf6 | 53 | spin_lock_bh(&orig_node->ogm_cnt_lock); |
42d0b044 | 54 | word_index = hard_iface->if_num * BATADV_NUM_WORDS; |
c6c8fea2 SE |
55 | word = &(orig_node->bcast_own[word_index]); |
56 | ||
0f5f9322 | 57 | batadv_bit_get_packet(bat_priv, word, 1, 0); |
42d0b044 SE |
58 | w = &orig_node->bcast_own_sum[hard_iface->if_num]; |
59 | *w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE); | |
2ae2daf6 | 60 | spin_unlock_bh(&orig_node->ogm_cnt_lock); |
c6c8fea2 | 61 | } |
fb778ea1 | 62 | rcu_read_unlock(); |
c6c8fea2 | 63 | } |
c6c8fea2 SE |
64 | } |
65 | ||
56303d34 SE |
66 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
67 | struct batadv_orig_node *orig_node, | |
68 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 69 | { |
56303d34 | 70 | struct batadv_neigh_node *curr_router; |
e1a5382f | 71 | |
7d211efc | 72 | curr_router = batadv_orig_node_get_router(orig_node); |
a8e7f4bc | 73 | |
c6c8fea2 | 74 | /* route deleted */ |
e1a5382f | 75 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
76 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
77 | "Deleting route towards: %pM\n", orig_node->orig); | |
08c36d3e SE |
78 | batadv_tt_global_del_orig(bat_priv, orig_node, |
79 | "Deleted route towards originator"); | |
c6c8fea2 | 80 | |
e1a5382f LL |
81 | /* route added */ |
82 | } else if ((!curr_router) && (neigh_node)) { | |
c6c8fea2 | 83 | |
39c75a51 | 84 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
85 | "Adding route towards: %pM (via %pM)\n", |
86 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 87 | /* route changed */ |
bb899b89 | 88 | } else if (neigh_node && curr_router) { |
39c75a51 | 89 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
90 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
91 | orig_node->orig, neigh_node->addr, | |
92 | curr_router->addr); | |
c6c8fea2 SE |
93 | } |
94 | ||
e1a5382f | 95 | if (curr_router) |
7d211efc | 96 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
97 | |
98 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
99 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
100 | neigh_node = NULL; | |
e1a5382f LL |
101 | |
102 | spin_lock_bh(&orig_node->neigh_list_lock); | |
103 | rcu_assign_pointer(orig_node->router, neigh_node); | |
104 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
105 | ||
106 | /* decrease refcount of previous best neighbor */ | |
107 | if (curr_router) | |
7d211efc | 108 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
109 | } |
110 | ||
56303d34 SE |
111 | void batadv_update_route(struct batadv_priv *bat_priv, |
112 | struct batadv_orig_node *orig_node, | |
113 | struct batadv_neigh_node *neigh_node) | |
c6c8fea2 | 114 | { |
56303d34 | 115 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
116 | |
117 | if (!orig_node) | |
e1a5382f LL |
118 | goto out; |
119 | ||
7d211efc | 120 | router = batadv_orig_node_get_router(orig_node); |
c6c8fea2 | 121 | |
e1a5382f | 122 | if (router != neigh_node) |
63b01037 | 123 | _batadv_update_route(bat_priv, orig_node, neigh_node); |
e1a5382f LL |
124 | |
125 | out: | |
126 | if (router) | |
7d211efc | 127 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
128 | } |
129 | ||
a4c135c5 | 130 | /* caller must hold the neigh_list_lock */ |
56303d34 SE |
131 | void batadv_bonding_candidate_del(struct batadv_orig_node *orig_node, |
132 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
133 | { |
134 | /* this neighbor is not part of our candidate list */ | |
135 | if (list_empty(&neigh_node->bonding_list)) | |
136 | goto out; | |
137 | ||
138 | list_del_rcu(&neigh_node->bonding_list); | |
a4c135c5 | 139 | INIT_LIST_HEAD(&neigh_node->bonding_list); |
7d211efc | 140 | batadv_neigh_node_free_ref(neigh_node); |
a4c135c5 SW |
141 | atomic_dec(&orig_node->bond_candidates); |
142 | ||
143 | out: | |
144 | return; | |
145 | } | |
146 | ||
56303d34 SE |
147 | void batadv_bonding_candidate_add(struct batadv_orig_node *orig_node, |
148 | struct batadv_neigh_node *neigh_node) | |
a4c135c5 SW |
149 | { |
150 | struct hlist_node *node; | |
56303d34 | 151 | struct batadv_neigh_node *tmp_neigh_node, *router = NULL; |
e1a5382f | 152 | uint8_t interference_candidate = 0; |
a4c135c5 SW |
153 | |
154 | spin_lock_bh(&orig_node->neigh_list_lock); | |
155 | ||
156 | /* only consider if it has the same primary address ... */ | |
1eda58bf SE |
157 | if (!batadv_compare_eth(orig_node->orig, |
158 | neigh_node->orig_node->primary_addr)) | |
a4c135c5 SW |
159 | goto candidate_del; |
160 | ||
7d211efc | 161 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 162 | if (!router) |
a4c135c5 SW |
163 | goto candidate_del; |
164 | ||
a4c135c5 | 165 | /* ... and is good enough to be considered */ |
42d0b044 | 166 | if (neigh_node->tq_avg < router->tq_avg - BATADV_BONDING_TQ_THRESHOLD) |
a4c135c5 SW |
167 | goto candidate_del; |
168 | ||
9cfc7bd6 | 169 | /* check if we have another candidate with the same mac address or |
a4c135c5 SW |
170 | * interface. If we do, we won't select this candidate because of |
171 | * possible interference. | |
172 | */ | |
173 | hlist_for_each_entry_rcu(tmp_neigh_node, node, | |
174 | &orig_node->neigh_list, list) { | |
175 | ||
176 | if (tmp_neigh_node == neigh_node) | |
177 | continue; | |
178 | ||
179 | /* we only care if the other candidate is even | |
9cfc7bd6 SE |
180 | * considered as candidate. |
181 | */ | |
a4c135c5 SW |
182 | if (list_empty(&tmp_neigh_node->bonding_list)) |
183 | continue; | |
184 | ||
185 | if ((neigh_node->if_incoming == tmp_neigh_node->if_incoming) || | |
1eda58bf SE |
186 | (batadv_compare_eth(neigh_node->addr, |
187 | tmp_neigh_node->addr))) { | |
a4c135c5 SW |
188 | interference_candidate = 1; |
189 | break; | |
190 | } | |
191 | } | |
192 | ||
193 | /* don't care further if it is an interference candidate */ | |
194 | if (interference_candidate) | |
195 | goto candidate_del; | |
196 | ||
197 | /* this neighbor already is part of our candidate list */ | |
198 | if (!list_empty(&neigh_node->bonding_list)) | |
199 | goto out; | |
200 | ||
44524fcd ML |
201 | if (!atomic_inc_not_zero(&neigh_node->refcount)) |
202 | goto out; | |
203 | ||
a4c135c5 | 204 | list_add_rcu(&neigh_node->bonding_list, &orig_node->bond_list); |
a4c135c5 SW |
205 | atomic_inc(&orig_node->bond_candidates); |
206 | goto out; | |
207 | ||
208 | candidate_del: | |
30d3c511 | 209 | batadv_bonding_candidate_del(orig_node, neigh_node); |
a4c135c5 SW |
210 | |
211 | out: | |
212 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
e1a5382f LL |
213 | |
214 | if (router) | |
7d211efc | 215 | batadv_neigh_node_free_ref(router); |
a4c135c5 SW |
216 | } |
217 | ||
218 | /* copy primary address for bonding */ | |
30d3c511 | 219 | void |
56303d34 SE |
220 | batadv_bonding_save_primary(const struct batadv_orig_node *orig_node, |
221 | struct batadv_orig_node *orig_neigh_node, | |
96412690 | 222 | const struct batadv_ogm_packet *batman_ogm_packet) |
a4c135c5 | 223 | { |
acd34afa | 224 | if (!(batman_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
a4c135c5 SW |
225 | return; |
226 | ||
227 | memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); | |
228 | } | |
229 | ||
c6c8fea2 SE |
230 | /* checks whether the host restarted and is in the protection time. |
231 | * returns: | |
232 | * 0 if the packet is to be accepted | |
233 | * 1 if the packet is to be ignored. | |
234 | */ | |
56303d34 | 235 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 236 | unsigned long *last_reset) |
c6c8fea2 | 237 | { |
42d0b044 SE |
238 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
239 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
240 | if (!batadv_has_timed_out(*last_reset, | |
241 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 242 | return 1; |
8c7bf248 ML |
243 | |
244 | *last_reset = jiffies; | |
39c75a51 | 245 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 246 | "old packet received, start protection\n"); |
c6c8fea2 | 247 | } |
8c7bf248 | 248 | |
c6c8fea2 SE |
249 | return 0; |
250 | } | |
251 | ||
30d3c511 | 252 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 253 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 254 | int header_len) |
c6c8fea2 | 255 | { |
c6c8fea2 SE |
256 | struct ethhdr *ethhdr; |
257 | ||
258 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
259 | if (unlikely(!pskb_may_pull(skb, header_len))) |
260 | return false; | |
c6c8fea2 SE |
261 | |
262 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
263 | ||
264 | /* packet with broadcast indication but unicast recipient */ | |
265 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 266 | return false; |
c6c8fea2 SE |
267 | |
268 | /* packet with broadcast sender address */ | |
269 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 270 | return false; |
c6c8fea2 SE |
271 | |
272 | /* create a copy of the skb, if needed, to modify it. */ | |
273 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 274 | return false; |
c6c8fea2 SE |
275 | |
276 | /* keep skb linear */ | |
277 | if (skb_linearize(skb) < 0) | |
c3e29312 | 278 | return false; |
c6c8fea2 | 279 | |
c3e29312 | 280 | return true; |
c6c8fea2 SE |
281 | } |
282 | ||
56303d34 | 283 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
63b01037 | 284 | struct sk_buff *skb, size_t icmp_len) |
c6c8fea2 | 285 | { |
56303d34 SE |
286 | struct batadv_hard_iface *primary_if = NULL; |
287 | struct batadv_orig_node *orig_node = 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 | |
44524fcd | 309 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 310 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd ML |
311 | goto out; |
312 | ||
96412690 | 313 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
44524fcd ML |
314 | |
315 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); | |
32ae9b22 | 316 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 317 | icmp_packet->msg_type = BATADV_ECHO_REPLY; |
42d0b044 | 318 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 319 | |
bb351ba0 MH |
320 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
321 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 322 | |
44524fcd | 323 | out: |
32ae9b22 | 324 | if (primary_if) |
e5d89254 | 325 | batadv_hardif_free_ref(primary_if); |
44524fcd | 326 | if (orig_node) |
7d211efc | 327 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
328 | return ret; |
329 | } | |
330 | ||
56303d34 | 331 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 332 | struct sk_buff *skb) |
c6c8fea2 | 333 | { |
56303d34 SE |
334 | struct batadv_hard_iface *primary_if = NULL; |
335 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 336 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 337 | int ret = NET_RX_DROP; |
c6c8fea2 | 338 | |
96412690 | 339 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
340 | |
341 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
acd34afa | 342 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 SE |
343 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
344 | icmp_packet->orig, icmp_packet->dst); | |
44524fcd | 345 | goto out; |
c6c8fea2 SE |
346 | } |
347 | ||
e5d89254 | 348 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 349 | if (!primary_if) |
44524fcd | 350 | goto out; |
c6c8fea2 SE |
351 | |
352 | /* get routing information */ | |
da641193 | 353 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 354 | if (!orig_node) |
e1a5382f | 355 | goto out; |
c6c8fea2 | 356 | |
44524fcd | 357 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 358 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 359 | goto out; |
c6c8fea2 | 360 | |
96412690 | 361 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 362 | |
44524fcd | 363 | memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); |
32ae9b22 | 364 | memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); |
acd34afa | 365 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
42d0b044 | 366 | icmp_packet->header.ttl = BATADV_TTL; |
44524fcd | 367 | |
bb351ba0 MH |
368 | if (batadv_send_skb_to_orig(skb, orig_node, NULL)) |
369 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 370 | |
44524fcd | 371 | out: |
32ae9b22 | 372 | if (primary_if) |
e5d89254 | 373 | batadv_hardif_free_ref(primary_if); |
44524fcd | 374 | if (orig_node) |
7d211efc | 375 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
376 | return ret; |
377 | } | |
378 | ||
379 | ||
56303d34 SE |
380 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
381 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 382 | { |
56303d34 | 383 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 384 | struct batadv_icmp_packet_rr *icmp_packet; |
c6c8fea2 | 385 | struct ethhdr *ethhdr; |
56303d34 | 386 | struct batadv_orig_node *orig_node = NULL; |
96412690 | 387 | int hdr_size = sizeof(struct batadv_icmp_packet); |
44524fcd | 388 | int ret = NET_RX_DROP; |
c6c8fea2 | 389 | |
9cfc7bd6 | 390 | /* we truncate all incoming icmp packets if they don't match our size */ |
96412690 SE |
391 | if (skb->len >= sizeof(struct batadv_icmp_packet_rr)) |
392 | hdr_size = sizeof(struct batadv_icmp_packet_rr); | |
c6c8fea2 SE |
393 | |
394 | /* drop packet if it has not necessary minimum size */ | |
395 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 396 | goto out; |
c6c8fea2 SE |
397 | |
398 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
399 | ||
400 | /* packet with unicast indication but broadcast recipient */ | |
401 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 402 | goto out; |
c6c8fea2 SE |
403 | |
404 | /* packet with broadcast sender address */ | |
405 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 406 | goto out; |
c6c8fea2 SE |
407 | |
408 | /* not for me */ | |
3193e8fd | 409 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
44524fcd | 410 | goto out; |
c6c8fea2 | 411 | |
96412690 | 412 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 SE |
413 | |
414 | /* add record route information if not full */ | |
96412690 | 415 | if ((hdr_size == sizeof(struct batadv_icmp_packet_rr)) && |
7e071c79 | 416 | (icmp_packet->rr_cur < BATADV_RR_LEN)) { |
c6c8fea2 | 417 | memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), |
7c64fd98 | 418 | ethhdr->h_dest, ETH_ALEN); |
c6c8fea2 SE |
419 | icmp_packet->rr_cur++; |
420 | } | |
421 | ||
422 | /* packet for me */ | |
3193e8fd | 423 | if (batadv_is_my_mac(icmp_packet->dst)) |
63b01037 | 424 | return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size); |
c6c8fea2 SE |
425 | |
426 | /* TTL exceeded */ | |
76543d14 | 427 | if (icmp_packet->header.ttl < 2) |
63b01037 | 428 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 429 | |
c6c8fea2 | 430 | /* get routing information */ |
da641193 | 431 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); |
44524fcd | 432 | if (!orig_node) |
e1a5382f | 433 | goto out; |
c6c8fea2 | 434 | |
44524fcd | 435 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 436 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 437 | goto out; |
c6c8fea2 | 438 | |
96412690 | 439 | icmp_packet = (struct batadv_icmp_packet_rr *)skb->data; |
c6c8fea2 | 440 | |
44524fcd | 441 | /* decrement ttl */ |
76543d14 | 442 | icmp_packet->header.ttl--; |
44524fcd ML |
443 | |
444 | /* route it */ | |
bb351ba0 MH |
445 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) |
446 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 447 | |
44524fcd | 448 | out: |
44524fcd | 449 | if (orig_node) |
7d211efc | 450 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
451 | return ret; |
452 | } | |
453 | ||
55158629 LL |
454 | /* In the bonding case, send the packets in a round |
455 | * robin fashion over the remaining interfaces. | |
456 | * | |
457 | * This method rotates the bonding list and increases the | |
9cfc7bd6 SE |
458 | * returned router's refcount. |
459 | */ | |
56303d34 SE |
460 | static struct batadv_neigh_node * |
461 | batadv_find_bond_router(struct batadv_orig_node *primary_orig, | |
462 | const struct batadv_hard_iface *recv_if) | |
55158629 | 463 | { |
56303d34 SE |
464 | struct batadv_neigh_node *tmp_neigh_node; |
465 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
466 | |
467 | rcu_read_lock(); | |
468 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
469 | bonding_list) { | |
470 | if (!first_candidate) | |
471 | first_candidate = tmp_neigh_node; | |
472 | ||
473 | /* recv_if == NULL on the first node. */ | |
474 | if (tmp_neigh_node->if_incoming == recv_if) | |
475 | continue; | |
476 | ||
477 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
478 | continue; | |
479 | ||
480 | router = tmp_neigh_node; | |
481 | break; | |
482 | } | |
483 | ||
484 | /* use the first candidate if nothing was found. */ | |
485 | if (!router && first_candidate && | |
486 | atomic_inc_not_zero(&first_candidate->refcount)) | |
487 | router = first_candidate; | |
488 | ||
489 | if (!router) | |
490 | goto out; | |
491 | ||
492 | /* selected should point to the next element | |
9cfc7bd6 SE |
493 | * after the current router |
494 | */ | |
55158629 LL |
495 | spin_lock_bh(&primary_orig->neigh_list_lock); |
496 | /* this is a list_move(), which unfortunately | |
9cfc7bd6 SE |
497 | * does not exist as rcu version |
498 | */ | |
55158629 LL |
499 | list_del_rcu(&primary_orig->bond_list); |
500 | list_add_rcu(&primary_orig->bond_list, | |
501 | &router->bonding_list); | |
502 | spin_unlock_bh(&primary_orig->neigh_list_lock); | |
503 | ||
504 | out: | |
505 | rcu_read_unlock(); | |
506 | return router; | |
507 | } | |
508 | ||
509 | /* Interface Alternating: Use the best of the | |
510 | * remaining candidates which are not using | |
511 | * this interface. | |
512 | * | |
9cfc7bd6 SE |
513 | * Increases the returned router's refcount |
514 | */ | |
56303d34 SE |
515 | static struct batadv_neigh_node * |
516 | batadv_find_ifalter_router(struct batadv_orig_node *primary_orig, | |
517 | const struct batadv_hard_iface *recv_if) | |
55158629 | 518 | { |
56303d34 SE |
519 | struct batadv_neigh_node *tmp_neigh_node; |
520 | struct batadv_neigh_node *router = NULL, *first_candidate = NULL; | |
55158629 LL |
521 | |
522 | rcu_read_lock(); | |
523 | list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list, | |
524 | bonding_list) { | |
525 | if (!first_candidate) | |
526 | first_candidate = tmp_neigh_node; | |
527 | ||
528 | /* recv_if == NULL on the first node. */ | |
529 | if (tmp_neigh_node->if_incoming == recv_if) | |
530 | continue; | |
531 | ||
fe3f4cfe SE |
532 | if (router && tmp_neigh_node->tq_avg <= router->tq_avg) |
533 | continue; | |
534 | ||
55158629 LL |
535 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
536 | continue; | |
537 | ||
fe3f4cfe SE |
538 | /* decrement refcount of previously selected router */ |
539 | if (router) | |
540 | batadv_neigh_node_free_ref(router); | |
55158629 | 541 | |
fe3f4cfe SE |
542 | /* we found a better router (or at least one valid router) */ |
543 | router = tmp_neigh_node; | |
55158629 LL |
544 | } |
545 | ||
546 | /* use the first candidate if nothing was found. */ | |
547 | if (!router && first_candidate && | |
548 | atomic_inc_not_zero(&first_candidate->refcount)) | |
549 | router = first_candidate; | |
550 | ||
551 | rcu_read_unlock(); | |
552 | return router; | |
553 | } | |
554 | ||
ff51fd70 MH |
555 | static int batadv_check_unicast_packet(struct sk_buff *skb, int hdr_size) |
556 | { | |
557 | struct ethhdr *ethhdr; | |
558 | ||
559 | /* drop packet if it has not necessary minimum size */ | |
560 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
561 | return -1; | |
562 | ||
563 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
564 | ||
565 | /* packet with unicast indication but broadcast recipient */ | |
566 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
567 | return -1; | |
568 | ||
569 | /* packet with broadcast sender address */ | |
570 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
571 | return -1; | |
572 | ||
573 | /* not for me */ | |
574 | if (!batadv_is_my_mac(ethhdr->h_dest)) | |
575 | return -1; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | ||
56303d34 | 580 | int batadv_recv_tt_query(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
a73105b8 | 581 | { |
56303d34 | 582 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 583 | struct batadv_tt_query_packet *tt_query; |
f25bd58a | 584 | uint16_t tt_size; |
74ee3634 | 585 | int hdr_size = sizeof(*tt_query); |
1eda58bf | 586 | char tt_flag; |
96412690 | 587 | size_t packet_size; |
a73105b8 | 588 | |
74ee3634 MH |
589 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
590 | return NET_RX_DROP; | |
a73105b8 AQ |
591 | |
592 | /* I could need to modify it */ | |
96412690 | 593 | if (skb_cow(skb, sizeof(struct batadv_tt_query_packet)) < 0) |
a73105b8 AQ |
594 | goto out; |
595 | ||
96412690 | 596 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 597 | |
7e071c79 | 598 | switch (tt_query->flags & BATADV_TT_QUERY_TYPE_MASK) { |
acd34afa | 599 | case BATADV_TT_REQUEST: |
d69909d2 | 600 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX); |
f8214865 | 601 | |
a73105b8 | 602 | /* If we cannot provide an answer the tt_request is |
9cfc7bd6 SE |
603 | * forwarded |
604 | */ | |
08c36d3e | 605 | if (!batadv_send_tt_response(bat_priv, tt_query)) { |
acd34afa SE |
606 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
607 | tt_flag = 'F'; | |
608 | else | |
609 | tt_flag = '.'; | |
610 | ||
39c75a51 | 611 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
612 | "Routing TT_REQUEST to %pM [%c]\n", |
613 | tt_query->dst, | |
614 | tt_flag); | |
63b01037 | 615 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
616 | } |
617 | break; | |
acd34afa | 618 | case BATADV_TT_RESPONSE: |
d69909d2 | 619 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX); |
f8214865 | 620 | |
3193e8fd | 621 | if (batadv_is_my_mac(tt_query->dst)) { |
dc58fe32 | 622 | /* packet needs to be linearized to access the TT |
9cfc7bd6 SE |
623 | * changes |
624 | */ | |
dc58fe32 AQ |
625 | if (skb_linearize(skb) < 0) |
626 | goto out; | |
d2b6cc8e | 627 | /* skb_linearize() possibly changed skb->data */ |
96412690 | 628 | tt_query = (struct batadv_tt_query_packet *)skb->data; |
a73105b8 | 629 | |
08c36d3e | 630 | tt_size = batadv_tt_len(ntohs(tt_query->tt_data)); |
8b7342d6 AQ |
631 | |
632 | /* Ensure we have all the claimed data */ | |
96412690 SE |
633 | packet_size = sizeof(struct batadv_tt_query_packet); |
634 | packet_size += tt_size; | |
635 | if (unlikely(skb_headlen(skb) < packet_size)) | |
8b7342d6 AQ |
636 | goto out; |
637 | ||
08c36d3e | 638 | batadv_handle_tt_response(bat_priv, tt_query); |
dc58fe32 | 639 | } else { |
acd34afa SE |
640 | if (tt_query->flags & BATADV_TT_FULL_TABLE) |
641 | tt_flag = 'F'; | |
642 | else | |
643 | tt_flag = '.'; | |
39c75a51 | 644 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
645 | "Routing TT_RESPONSE to %pM [%c]\n", |
646 | tt_query->dst, | |
647 | tt_flag); | |
63b01037 | 648 | return batadv_route_unicast_packet(skb, recv_if); |
a73105b8 AQ |
649 | } |
650 | break; | |
651 | } | |
652 | ||
653 | out: | |
654 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
655 | return NET_RX_DROP; | |
656 | } | |
657 | ||
56303d34 | 658 | int batadv_recv_roam_adv(struct sk_buff *skb, struct batadv_hard_iface *recv_if) |
cc47f66e | 659 | { |
56303d34 | 660 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 661 | struct batadv_roam_adv_packet *roam_adv_packet; |
56303d34 | 662 | struct batadv_orig_node *orig_node; |
cc47f66e | 663 | |
d48ddb83 | 664 | if (batadv_check_unicast_packet(skb, sizeof(*roam_adv_packet)) < 0) |
cc47f66e AQ |
665 | goto out; |
666 | ||
d69909d2 | 667 | batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX); |
f8214865 | 668 | |
96412690 | 669 | roam_adv_packet = (struct batadv_roam_adv_packet *)skb->data; |
cc47f66e | 670 | |
3193e8fd | 671 | if (!batadv_is_my_mac(roam_adv_packet->dst)) |
63b01037 | 672 | return batadv_route_unicast_packet(skb, recv_if); |
cc47f66e | 673 | |
20ff9d59 SW |
674 | /* check if it is a backbone gateway. we don't accept |
675 | * roaming advertisement from it, as it has the same | |
676 | * entries as we have. | |
677 | */ | |
08adf151 | 678 | if (batadv_bla_is_backbone_gw_orig(bat_priv, roam_adv_packet->src)) |
20ff9d59 SW |
679 | goto out; |
680 | ||
da641193 | 681 | orig_node = batadv_orig_hash_find(bat_priv, roam_adv_packet->src); |
cc47f66e AQ |
682 | if (!orig_node) |
683 | goto out; | |
684 | ||
39c75a51 | 685 | batadv_dbg(BATADV_DBG_TT, bat_priv, |
1eda58bf SE |
686 | "Received ROAMING_ADV from %pM (client %pM)\n", |
687 | roam_adv_packet->src, roam_adv_packet->client); | |
cc47f66e | 688 | |
08c36d3e | 689 | batadv_tt_global_add(bat_priv, orig_node, roam_adv_packet->client, |
acd34afa | 690 | BATADV_TT_CLIENT_ROAM, |
d4f44692 | 691 | atomic_read(&orig_node->last_ttvn) + 1); |
cc47f66e | 692 | |
7d211efc | 693 | batadv_orig_node_free_ref(orig_node); |
cc47f66e AQ |
694 | out: |
695 | /* returning NET_RX_DROP will make the caller function kfree the skb */ | |
696 | return NET_RX_DROP; | |
697 | } | |
698 | ||
c6c8fea2 | 699 | /* find a suitable router for this originator, and use |
a4c135c5 | 700 | * bonding if possible. increases the found neighbors |
9cfc7bd6 SE |
701 | * refcount. |
702 | */ | |
56303d34 SE |
703 | struct batadv_neigh_node * |
704 | batadv_find_router(struct batadv_priv *bat_priv, | |
705 | struct batadv_orig_node *orig_node, | |
706 | const struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 707 | { |
56303d34 SE |
708 | struct batadv_orig_node *primary_orig_node; |
709 | struct batadv_orig_node *router_orig; | |
710 | struct batadv_neigh_node *router; | |
c6c8fea2 SE |
711 | static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; |
712 | int bonding_enabled; | |
da641193 | 713 | uint8_t *primary_addr; |
c6c8fea2 SE |
714 | |
715 | if (!orig_node) | |
716 | return NULL; | |
717 | ||
7d211efc | 718 | router = batadv_orig_node_get_router(orig_node); |
e1a5382f | 719 | if (!router) |
01df2b65 | 720 | goto err; |
c6c8fea2 SE |
721 | |
722 | /* without bonding, the first node should | |
9cfc7bd6 SE |
723 | * always choose the default router. |
724 | */ | |
c6c8fea2 SE |
725 | bonding_enabled = atomic_read(&bat_priv->bonding); |
726 | ||
a4c135c5 SW |
727 | rcu_read_lock(); |
728 | /* select default router to output */ | |
e1a5382f | 729 | router_orig = router->orig_node; |
01df2b65 ML |
730 | if (!router_orig) |
731 | goto err_unlock; | |
a4c135c5 | 732 | |
a4c135c5 SW |
733 | if ((!recv_if) && (!bonding_enabled)) |
734 | goto return_router; | |
c6c8fea2 | 735 | |
da641193 SE |
736 | primary_addr = router_orig->primary_addr; |
737 | ||
c6c8fea2 | 738 | /* if we have something in the primary_addr, we can search |
9cfc7bd6 SE |
739 | * for a potential bonding candidate. |
740 | */ | |
1eda58bf | 741 | if (batadv_compare_eth(primary_addr, zero_mac)) |
a4c135c5 | 742 | goto return_router; |
c6c8fea2 SE |
743 | |
744 | /* find the orig_node which has the primary interface. might | |
9cfc7bd6 SE |
745 | * even be the same as our router_orig in many cases |
746 | */ | |
1eda58bf | 747 | if (batadv_compare_eth(primary_addr, router_orig->orig)) { |
c6c8fea2 SE |
748 | primary_orig_node = router_orig; |
749 | } else { | |
da641193 SE |
750 | primary_orig_node = batadv_orig_hash_find(bat_priv, |
751 | primary_addr); | |
c6c8fea2 | 752 | if (!primary_orig_node) |
a4c135c5 | 753 | goto return_router; |
7aadf889 | 754 | |
7d211efc | 755 | batadv_orig_node_free_ref(primary_orig_node); |
c6c8fea2 SE |
756 | } |
757 | ||
758 | /* with less than 2 candidates, we can't do any | |
9cfc7bd6 SE |
759 | * bonding and prefer the original router. |
760 | */ | |
a4c135c5 SW |
761 | if (atomic_read(&primary_orig_node->bond_candidates) < 2) |
762 | goto return_router; | |
c6c8fea2 | 763 | |
c6c8fea2 SE |
764 | /* all nodes between should choose a candidate which |
765 | * is is not on the interface where the packet came | |
9cfc7bd6 SE |
766 | * in. |
767 | */ | |
7d211efc | 768 | batadv_neigh_node_free_ref(router); |
c6c8fea2 | 769 | |
55158629 | 770 | if (bonding_enabled) |
63b01037 | 771 | router = batadv_find_bond_router(primary_orig_node, recv_if); |
55158629 | 772 | else |
63b01037 | 773 | router = batadv_find_ifalter_router(primary_orig_node, recv_if); |
c6c8fea2 | 774 | |
a4c135c5 | 775 | return_router: |
e9a4f295 | 776 | if (router && router->if_incoming->if_status != BATADV_IF_ACTIVE) |
e2cbc11c AQ |
777 | goto err_unlock; |
778 | ||
a4c135c5 | 779 | rcu_read_unlock(); |
c6c8fea2 | 780 | return router; |
01df2b65 ML |
781 | err_unlock: |
782 | rcu_read_unlock(); | |
783 | err: | |
784 | if (router) | |
7d211efc | 785 | batadv_neigh_node_free_ref(router); |
01df2b65 | 786 | return NULL; |
c6c8fea2 SE |
787 | } |
788 | ||
63b01037 | 789 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 790 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 791 | { |
56303d34 SE |
792 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
793 | struct batadv_orig_node *orig_node = NULL; | |
794 | struct batadv_neigh_node *neigh_node = NULL; | |
96412690 | 795 | struct batadv_unicast_packet *unicast_packet; |
c6c8fea2 | 796 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); |
44524fcd | 797 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
798 | struct sk_buff *new_skb; |
799 | ||
96412690 | 800 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
801 | |
802 | /* TTL exceeded */ | |
76543d14 | 803 | if (unicast_packet->header.ttl < 2) { |
86ceb360 SE |
804 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
805 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 806 | goto out; |
c6c8fea2 SE |
807 | } |
808 | ||
809 | /* get routing information */ | |
da641193 | 810 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 811 | |
44524fcd | 812 | if (!orig_node) |
b5a6f69c | 813 | goto out; |
c6c8fea2 | 814 | |
a4c135c5 | 815 | /* find_router() increases neigh_nodes refcount if found. */ |
30d3c511 | 816 | neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); |
c6c8fea2 | 817 | |
d0072609 | 818 | if (!neigh_node) |
44524fcd | 819 | goto out; |
c6c8fea2 SE |
820 | |
821 | /* create a copy of the skb, if needed, to modify it. */ | |
0d125074 | 822 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 823 | goto out; |
c6c8fea2 | 824 | |
96412690 | 825 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 | 826 | |
acd34afa | 827 | if (unicast_packet->header.packet_type == BATADV_UNICAST && |
c6c8fea2 | 828 | atomic_read(&bat_priv->fragmentation) && |
d0072609 | 829 | skb->len > neigh_node->if_incoming->net_dev->mtu) { |
88ed1e77 SE |
830 | ret = batadv_frag_send_skb(skb, bat_priv, |
831 | neigh_node->if_incoming, | |
832 | neigh_node->addr); | |
d0072609 ML |
833 | goto out; |
834 | } | |
c6c8fea2 | 835 | |
acd34afa | 836 | if (unicast_packet->header.packet_type == BATADV_UNICAST_FRAG && |
f0530ee5 SE |
837 | batadv_frag_can_reassemble(skb, |
838 | neigh_node->if_incoming->net_dev->mtu)) { | |
c6c8fea2 | 839 | |
88ed1e77 | 840 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
841 | |
842 | if (ret == NET_RX_DROP) | |
44524fcd | 843 | goto out; |
c6c8fea2 SE |
844 | |
845 | /* packet was buffered for late merge */ | |
44524fcd ML |
846 | if (!new_skb) { |
847 | ret = NET_RX_SUCCESS; | |
848 | goto out; | |
849 | } | |
c6c8fea2 SE |
850 | |
851 | skb = new_skb; | |
96412690 | 852 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
853 | } |
854 | ||
855 | /* decrement ttl */ | |
76543d14 | 856 | unicast_packet->header.ttl--; |
c6c8fea2 | 857 | |
f8214865 | 858 | /* Update stats counter */ |
d69909d2 SE |
859 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
860 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
f8214865 MH |
861 | skb->len + ETH_HLEN); |
862 | ||
c6c8fea2 | 863 | /* route it */ |
bb351ba0 MH |
864 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if)) |
865 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 866 | |
44524fcd ML |
867 | out: |
868 | if (neigh_node) | |
7d211efc | 869 | batadv_neigh_node_free_ref(neigh_node); |
44524fcd | 870 | if (orig_node) |
7d211efc | 871 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 872 | return ret; |
c6c8fea2 SE |
873 | } |
874 | ||
7c1fd91d AQ |
875 | /** |
876 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
877 | * @bat_priv: the bat priv with all the soft interface information | |
878 | * @unicast_packet: the unicast header to be updated | |
879 | * @dst_addr: the payload destination | |
880 | * | |
881 | * Search the translation table for dst_addr and update the unicast header with | |
882 | * the new corresponding information (originator address where the destination | |
883 | * client currently is and its known TTVN) | |
884 | * | |
885 | * Returns true if the packet header has been updated, false otherwise | |
886 | */ | |
887 | static bool | |
888 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
889 | struct batadv_unicast_packet *unicast_packet, | |
890 | uint8_t *dst_addr) | |
891 | { | |
892 | struct batadv_orig_node *orig_node = NULL; | |
893 | struct batadv_hard_iface *primary_if = NULL; | |
894 | bool ret = false; | |
895 | uint8_t *orig_addr, orig_ttvn; | |
896 | ||
897 | if (batadv_is_my_client(bat_priv, dst_addr)) { | |
898 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
899 | if (!primary_if) | |
900 | goto out; | |
901 | orig_addr = primary_if->net_dev->dev_addr; | |
902 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
903 | } else { | |
904 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr); | |
905 | if (!orig_node) | |
906 | goto out; | |
907 | ||
908 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
909 | goto out; | |
910 | ||
911 | orig_addr = orig_node->orig; | |
912 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
913 | } | |
914 | ||
915 | /* update the packet header */ | |
916 | memcpy(unicast_packet->dest, orig_addr, ETH_ALEN); | |
917 | unicast_packet->ttvn = orig_ttvn; | |
918 | ||
919 | ret = true; | |
920 | out: | |
921 | if (primary_if) | |
922 | batadv_hardif_free_ref(primary_if); | |
923 | if (orig_node) | |
924 | batadv_orig_node_free_ref(orig_node); | |
925 | ||
926 | return ret; | |
927 | } | |
928 | ||
56303d34 | 929 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
63b01037 | 930 | struct sk_buff *skb) { |
7c1fd91d | 931 | uint8_t curr_ttvn, old_ttvn; |
56303d34 | 932 | struct batadv_orig_node *orig_node; |
a73105b8 | 933 | struct ethhdr *ethhdr; |
56303d34 | 934 | struct batadv_hard_iface *primary_if; |
96412690 | 935 | struct batadv_unicast_packet *unicast_packet; |
3e34819e | 936 | int is_old_ttvn; |
a73105b8 | 937 | |
b8fcfa42 AQ |
938 | /* check if there is enough data before accessing it */ |
939 | if (pskb_may_pull(skb, sizeof(*unicast_packet) + ETH_HLEN) < 0) | |
940 | return 0; | |
941 | ||
942 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
943 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
944 | return 0; |
945 | ||
96412690 | 946 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
7c1fd91d | 947 | ethhdr = (struct ethhdr *)(skb->data + sizeof(*unicast_packet)); |
a73105b8 | 948 | |
7c1fd91d AQ |
949 | /* check if the destination client was served by this node and it is now |
950 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
951 | * message and that it knows the new destination in the mesh to re-route | |
952 | * the packet to | |
953 | */ | |
954 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest)) { | |
955 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
956 | ethhdr->h_dest)) | |
957 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, | |
958 | bat_priv, | |
959 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
960 | unicast_packet->dest, | |
961 | ethhdr->h_dest); | |
962 | /* at this point the mesh destination should have been | |
963 | * substituted with the originator address found in the global | |
964 | * table. If not, let the packet go untouched anyway because | |
965 | * there is nothing the node can do | |
966 | */ | |
967 | return 1; | |
968 | } | |
969 | ||
970 | /* retrieve the TTVN known by this node for the packet destination. This | |
971 | * value is used later to check if the node which sent (or re-routed | |
972 | * last time) the packet had an updated information or not | |
973 | */ | |
974 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
975 | if (!batadv_is_my_mac(unicast_packet->dest)) { | |
da641193 SE |
976 | orig_node = batadv_orig_hash_find(bat_priv, |
977 | unicast_packet->dest); | |
7c1fd91d AQ |
978 | /* if it is not possible to find the orig_node representing the |
979 | * destination, the packet can immediately be dropped as it will | |
980 | * not be possible to deliver it | |
981 | */ | |
a73105b8 AQ |
982 | if (!orig_node) |
983 | return 0; | |
984 | ||
985 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 986 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
987 | } |
988 | ||
7c1fd91d AQ |
989 | /* check if the TTVN contained in the packet is fresher than what the |
990 | * node knows | |
991 | */ | |
3e34819e | 992 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
993 | if (!is_old_ttvn) |
994 | return 1; | |
a73105b8 | 995 | |
7c1fd91d AQ |
996 | old_ttvn = unicast_packet->ttvn; |
997 | /* the packet was forged based on outdated network information. Its | |
998 | * destination can possibly be updated and forwarded towards the new | |
999 | * target host | |
1000 | */ | |
1001 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
1002 | ethhdr->h_dest)) { | |
1003 | net_ratelimited_function(batadv_dbg, BATADV_DBG_TT, bat_priv, | |
1004 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
1005 | unicast_packet->dest, ethhdr->h_dest, | |
1006 | old_ttvn, curr_ttvn); | |
1007 | return 1; | |
1008 | } | |
3275e7cc | 1009 | |
7c1fd91d AQ |
1010 | /* the packet has not been re-routed: either the destination is |
1011 | * currently served by this node or there is no destination at all and | |
1012 | * it is possible to drop the packet | |
1013 | */ | |
1014 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest)) | |
1015 | return 0; | |
3275e7cc | 1016 | |
7c1fd91d AQ |
1017 | /* update the header in order to let the packet be delivered to this |
1018 | * node's soft interface | |
1019 | */ | |
1020 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
1021 | if (!primary_if) | |
1022 | return 0; | |
a73105b8 | 1023 | |
7c1fd91d AQ |
1024 | memcpy(unicast_packet->dest, primary_if->net_dev->dev_addr, ETH_ALEN); |
1025 | ||
1026 | batadv_hardif_free_ref(primary_if); | |
1027 | ||
1028 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 1029 | |
a73105b8 AQ |
1030 | return 1; |
1031 | } | |
1032 | ||
56303d34 SE |
1033 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
1034 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1035 | { |
56303d34 | 1036 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1037 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 1038 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
1039 | uint8_t *orig_addr; |
1040 | struct batadv_orig_node *orig_node = NULL; | |
704509b8 | 1041 | int hdr_size = sizeof(*unicast_packet); |
c384ea3e | 1042 | bool is4addr; |
c6c8fea2 | 1043 | |
7cdcf6dd | 1044 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 1045 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 1046 | |
c384ea3e | 1047 | is4addr = unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 1048 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 1049 | if (is4addr) |
4046b24a | 1050 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 1051 | |
63b01037 | 1052 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1053 | return NET_RX_DROP; |
1054 | ||
63b01037 | 1055 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1056 | return NET_RX_DROP; |
1057 | ||
c6c8fea2 | 1058 | /* packet for me */ |
3193e8fd | 1059 | if (batadv_is_my_mac(unicast_packet->dest)) { |
9affec6b | 1060 | if (is4addr) { |
4046b24a MH |
1061 | batadv_dat_inc_counter(bat_priv, |
1062 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
1063 | orig_addr = unicast_4addr_packet->src; |
1064 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
1065 | } | |
4046b24a | 1066 | |
c384ea3e AQ |
1067 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1068 | hdr_size)) | |
1069 | goto rx_success; | |
1070 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1071 | hdr_size)) | |
1072 | goto rx_success; | |
1073 | ||
37135173 | 1074 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 1075 | orig_node); |
37135173 | 1076 | |
c384ea3e | 1077 | rx_success: |
9affec6b AQ |
1078 | if (orig_node) |
1079 | batadv_orig_node_free_ref(orig_node); | |
1080 | ||
c6c8fea2 SE |
1081 | return NET_RX_SUCCESS; |
1082 | } | |
1083 | ||
63b01037 | 1084 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1085 | } |
1086 | ||
30d3c511 | 1087 | int batadv_recv_ucast_frag_packet(struct sk_buff *skb, |
56303d34 | 1088 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 1089 | { |
56303d34 | 1090 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 1091 | struct batadv_unicast_frag_packet *unicast_packet; |
704509b8 | 1092 | int hdr_size = sizeof(*unicast_packet); |
c6c8fea2 SE |
1093 | struct sk_buff *new_skb = NULL; |
1094 | int ret; | |
1095 | ||
63b01037 | 1096 | if (batadv_check_unicast_packet(skb, hdr_size) < 0) |
c6c8fea2 SE |
1097 | return NET_RX_DROP; |
1098 | ||
63b01037 | 1099 | if (!batadv_check_unicast_ttvn(bat_priv, skb)) |
a73105b8 AQ |
1100 | return NET_RX_DROP; |
1101 | ||
96412690 | 1102 | unicast_packet = (struct batadv_unicast_frag_packet *)skb->data; |
c6c8fea2 SE |
1103 | |
1104 | /* packet for me */ | |
3193e8fd | 1105 | if (batadv_is_my_mac(unicast_packet->dest)) { |
c6c8fea2 | 1106 | |
88ed1e77 | 1107 | ret = batadv_frag_reassemble_skb(skb, bat_priv, &new_skb); |
c6c8fea2 SE |
1108 | |
1109 | if (ret == NET_RX_DROP) | |
1110 | return NET_RX_DROP; | |
1111 | ||
1112 | /* packet was buffered for late merge */ | |
1113 | if (!new_skb) | |
1114 | return NET_RX_SUCCESS; | |
1115 | ||
c384ea3e AQ |
1116 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, new_skb, |
1117 | hdr_size)) | |
1118 | goto rx_success; | |
1119 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, new_skb, | |
1120 | hdr_size)) | |
1121 | goto rx_success; | |
1122 | ||
04b482a2 | 1123 | batadv_interface_rx(recv_if->soft_iface, new_skb, recv_if, |
37135173 | 1124 | sizeof(struct batadv_unicast_packet), NULL); |
c384ea3e AQ |
1125 | |
1126 | rx_success: | |
c6c8fea2 SE |
1127 | return NET_RX_SUCCESS; |
1128 | } | |
1129 | ||
63b01037 | 1130 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
1131 | } |
1132 | ||
1133 | ||
56303d34 SE |
1134 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1135 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1136 | { |
56303d34 SE |
1137 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1138 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1139 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1140 | struct ethhdr *ethhdr; |
704509b8 | 1141 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1142 | int ret = NET_RX_DROP; |
c6c8fea2 SE |
1143 | int32_t seq_diff; |
1144 | ||
1145 | /* drop packet if it has not necessary minimum size */ | |
1146 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1147 | goto out; |
c6c8fea2 SE |
1148 | |
1149 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1150 | ||
1151 | /* packet with broadcast indication but unicast recipient */ | |
1152 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1153 | goto out; |
c6c8fea2 SE |
1154 | |
1155 | /* packet with broadcast sender address */ | |
1156 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1157 | goto out; |
c6c8fea2 SE |
1158 | |
1159 | /* ignore broadcasts sent by myself */ | |
3193e8fd | 1160 | if (batadv_is_my_mac(ethhdr->h_source)) |
f3e0008f | 1161 | goto out; |
c6c8fea2 | 1162 | |
96412690 | 1163 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1164 | |
1165 | /* ignore broadcasts originated by myself */ | |
3193e8fd | 1166 | if (batadv_is_my_mac(bcast_packet->orig)) |
f3e0008f | 1167 | goto out; |
c6c8fea2 | 1168 | |
76543d14 | 1169 | if (bcast_packet->header.ttl < 2) |
f3e0008f | 1170 | goto out; |
c6c8fea2 | 1171 | |
da641193 | 1172 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1173 | |
1174 | if (!orig_node) | |
b5a6f69c | 1175 | goto out; |
c6c8fea2 | 1176 | |
f3e0008f | 1177 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 SE |
1178 | |
1179 | /* check whether the packet is a duplicate */ | |
9b4a1159 SE |
1180 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
1181 | ntohl(bcast_packet->seqno))) | |
f3e0008f | 1182 | goto spin_unlock; |
c6c8fea2 SE |
1183 | |
1184 | seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; | |
1185 | ||
1186 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1187 | if (batadv_window_protected(bat_priv, seq_diff, |
1188 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1189 | goto spin_unlock; |
c6c8fea2 SE |
1190 | |
1191 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1192 | * if required. |
1193 | */ | |
0f5f9322 | 1194 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
c6c8fea2 SE |
1195 | orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); |
1196 | ||
f3e0008f | 1197 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1198 | |
7f112af4 LL |
1199 | /* keep skb linear for crc calculation */ |
1200 | if (skb_linearize(skb) < 0) | |
1201 | goto out; | |
1202 | ||
1203 | bcast_packet = (struct batadv_bcast_packet *)skb->data; | |
1204 | ||
fe2da6ff | 1205 | /* check whether this has been sent by another originator before */ |
7f112af4 | 1206 | if (batadv_bla_check_bcast_duplist(bat_priv, bcast_packet, skb->len)) |
fe2da6ff SW |
1207 | goto out; |
1208 | ||
c6c8fea2 | 1209 | /* rebroadcast packet */ |
9455e34c | 1210 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1211 | |
23721387 SW |
1212 | /* don't hand the broadcast up if it is from an originator |
1213 | * from the same backbone. | |
1214 | */ | |
08adf151 | 1215 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1216 | goto out; |
1217 | ||
c384ea3e AQ |
1218 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1219 | goto rx_success; | |
1220 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1221 | goto rx_success; | |
1222 | ||
c6c8fea2 | 1223 | /* broadcast for me */ |
37135173 AQ |
1224 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1225 | orig_node); | |
c384ea3e AQ |
1226 | |
1227 | rx_success: | |
f3e0008f ML |
1228 | ret = NET_RX_SUCCESS; |
1229 | goto out; | |
c6c8fea2 | 1230 | |
f3e0008f ML |
1231 | spin_unlock: |
1232 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1233 | out: |
1234 | if (orig_node) | |
7d211efc | 1235 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1236 | return ret; |
c6c8fea2 SE |
1237 | } |
1238 | ||
56303d34 SE |
1239 | int batadv_recv_vis_packet(struct sk_buff *skb, |
1240 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1241 | { |
96412690 | 1242 | struct batadv_vis_packet *vis_packet; |
c6c8fea2 | 1243 | struct ethhdr *ethhdr; |
56303d34 | 1244 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
704509b8 | 1245 | int hdr_size = sizeof(*vis_packet); |
c6c8fea2 SE |
1246 | |
1247 | /* keep skb linear */ | |
1248 | if (skb_linearize(skb) < 0) | |
1249 | return NET_RX_DROP; | |
1250 | ||
1251 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1252 | return NET_RX_DROP; | |
1253 | ||
96412690 | 1254 | vis_packet = (struct batadv_vis_packet *)skb->data; |
c6c8fea2 SE |
1255 | ethhdr = (struct ethhdr *)skb_mac_header(skb); |
1256 | ||
1257 | /* not for me */ | |
3193e8fd | 1258 | if (!batadv_is_my_mac(ethhdr->h_dest)) |
c6c8fea2 SE |
1259 | return NET_RX_DROP; |
1260 | ||
1261 | /* ignore own packets */ | |
3193e8fd | 1262 | if (batadv_is_my_mac(vis_packet->vis_orig)) |
c6c8fea2 SE |
1263 | return NET_RX_DROP; |
1264 | ||
3193e8fd | 1265 | if (batadv_is_my_mac(vis_packet->sender_orig)) |
c6c8fea2 SE |
1266 | return NET_RX_DROP; |
1267 | ||
1268 | switch (vis_packet->vis_type) { | |
acd34afa | 1269 | case BATADV_VIS_TYPE_SERVER_SYNC: |
d0f714f4 SE |
1270 | batadv_receive_server_sync_packet(bat_priv, vis_packet, |
1271 | skb_headlen(skb)); | |
c6c8fea2 SE |
1272 | break; |
1273 | ||
acd34afa | 1274 | case BATADV_VIS_TYPE_CLIENT_UPDATE: |
d0f714f4 SE |
1275 | batadv_receive_client_update_packet(bat_priv, vis_packet, |
1276 | skb_headlen(skb)); | |
c6c8fea2 SE |
1277 | break; |
1278 | ||
1279 | default: /* ignore unknown packet */ | |
1280 | break; | |
1281 | } | |
1282 | ||
1283 | /* We take a copy of the data in the packet, so we should | |
9cfc7bd6 SE |
1284 | * always free the skbuf. |
1285 | */ | |
c6c8fea2 SE |
1286 | return NET_RX_DROP; |
1287 | } |