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9f6446c7 | 1 | /* Copyright (C) 2007-2015 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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
c6c8fea2 | 18 | #include "routing.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/printk.h> | |
30 | #include <linux/rculist.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/skbuff.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/stddef.h> | |
35 | ||
36 | #include "bitarray.h" | |
23721387 | 37 | #include "bridge_loop_avoidance.h" |
c384ea3e | 38 | #include "distributed-arp-table.h" |
610bfc6b | 39 | #include "fragmentation.h" |
1e2c2a4f SE |
40 | #include "hard-interface.h" |
41 | #include "icmp_socket.h" | |
42 | #include "network-coding.h" | |
43 | #include "originator.h" | |
44 | #include "packet.h" | |
45 | #include "send.h" | |
46 | #include "soft-interface.h" | |
47 | #include "translation-table.h" | |
c018ad3d | 48 | |
63b01037 | 49 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 50 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 51 | |
7351a482 SW |
52 | /** |
53 | * _batadv_update_route - set the router for this originator | |
54 | * @bat_priv: the bat priv with all the soft interface information | |
55 | * @orig_node: orig node which is to be configured | |
56 | * @recv_if: the receive interface for which this route is set | |
57 | * @neigh_node: neighbor which should be the next router | |
58 | * | |
59 | * This function does not perform any error checks | |
60 | */ | |
56303d34 SE |
61 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
62 | struct batadv_orig_node *orig_node, | |
7351a482 | 63 | struct batadv_hard_iface *recv_if, |
56303d34 | 64 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 65 | { |
7351a482 | 66 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 67 | struct batadv_neigh_node *curr_router; |
e1a5382f | 68 | |
7351a482 SW |
69 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
70 | if (!orig_ifinfo) | |
71 | return; | |
72 | ||
73 | rcu_read_lock(); | |
74 | curr_router = rcu_dereference(orig_ifinfo->router); | |
75 | if (curr_router && !atomic_inc_not_zero(&curr_router->refcount)) | |
76 | curr_router = NULL; | |
77 | rcu_read_unlock(); | |
a8e7f4bc | 78 | |
c6c8fea2 | 79 | /* route deleted */ |
e1a5382f | 80 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
81 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
82 | "Deleting route towards: %pM\n", orig_node->orig); | |
95fb130d | 83 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 84 | "Deleted route towards originator"); |
c6c8fea2 | 85 | |
e1a5382f LL |
86 | /* route added */ |
87 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 88 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
89 | "Adding route towards: %pM (via %pM)\n", |
90 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 91 | /* route changed */ |
bb899b89 | 92 | } else if (neigh_node && curr_router) { |
39c75a51 | 93 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
94 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
95 | orig_node->orig, neigh_node->addr, | |
96 | curr_router->addr); | |
c6c8fea2 SE |
97 | } |
98 | ||
e1a5382f | 99 | if (curr_router) |
7d211efc | 100 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
101 | |
102 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
103 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
104 | neigh_node = NULL; | |
e1a5382f LL |
105 | |
106 | spin_lock_bh(&orig_node->neigh_list_lock); | |
7351a482 | 107 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
e1a5382f | 108 | spin_unlock_bh(&orig_node->neigh_list_lock); |
7351a482 | 109 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
e1a5382f LL |
110 | |
111 | /* decrease refcount of previous best neighbor */ | |
112 | if (curr_router) | |
7d211efc | 113 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
114 | } |
115 | ||
7351a482 SW |
116 | /** |
117 | * batadv_update_route - set the router for this originator | |
118 | * @bat_priv: the bat priv with all the soft interface information | |
119 | * @orig_node: orig node which is to be configured | |
120 | * @recv_if: the receive interface for which this route is set | |
121 | * @neigh_node: neighbor which should be the next router | |
122 | */ | |
56303d34 SE |
123 | void batadv_update_route(struct batadv_priv *bat_priv, |
124 | struct batadv_orig_node *orig_node, | |
7351a482 | 125 | struct batadv_hard_iface *recv_if, |
56303d34 | 126 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 127 | { |
56303d34 | 128 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
129 | |
130 | if (!orig_node) | |
e1a5382f LL |
131 | goto out; |
132 | ||
7351a482 | 133 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 134 | |
e1a5382f | 135 | if (router != neigh_node) |
7351a482 | 136 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
137 | |
138 | out: | |
139 | if (router) | |
7d211efc | 140 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
141 | } |
142 | ||
62fe710f SE |
143 | /** |
144 | * batadv_window_protected checks whether the host restarted and is in the | |
145 | * protection time. | |
146 | * | |
147 | * Return: | |
148 | * 0 if the packet is to be accepted. | |
c6c8fea2 SE |
149 | * 1 if the packet is to be ignored. |
150 | */ | |
6b5e971a | 151 | int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
30d3c511 | 152 | unsigned long *last_reset) |
c6c8fea2 | 153 | { |
42d0b044 SE |
154 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
155 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
156 | if (!batadv_has_timed_out(*last_reset, | |
157 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 158 | return 1; |
8c7bf248 ML |
159 | |
160 | *last_reset = jiffies; | |
39c75a51 | 161 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 162 | "old packet received, start protection\n"); |
c6c8fea2 | 163 | } |
8c7bf248 | 164 | |
c6c8fea2 SE |
165 | return 0; |
166 | } | |
167 | ||
30d3c511 | 168 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 169 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 170 | int header_len) |
c6c8fea2 | 171 | { |
c6c8fea2 SE |
172 | struct ethhdr *ethhdr; |
173 | ||
174 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
175 | if (unlikely(!pskb_may_pull(skb, header_len))) |
176 | return false; | |
c6c8fea2 | 177 | |
7ed4be95 | 178 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
179 | |
180 | /* packet with broadcast indication but unicast recipient */ | |
181 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 182 | return false; |
c6c8fea2 SE |
183 | |
184 | /* packet with broadcast sender address */ | |
185 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 186 | return false; |
c6c8fea2 SE |
187 | |
188 | /* create a copy of the skb, if needed, to modify it. */ | |
189 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 190 | return false; |
c6c8fea2 SE |
191 | |
192 | /* keep skb linear */ | |
193 | if (skb_linearize(skb) < 0) | |
c3e29312 | 194 | return false; |
c6c8fea2 | 195 | |
c3e29312 | 196 | return true; |
c6c8fea2 SE |
197 | } |
198 | ||
da6b8c20 SW |
199 | /** |
200 | * batadv_recv_my_icmp_packet - receive an icmp packet locally | |
201 | * @bat_priv: the bat priv with all the soft interface information | |
202 | * @skb: icmp packet to process | |
203 | * | |
62fe710f | 204 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
da6b8c20 SW |
205 | * otherwise. |
206 | */ | |
56303d34 | 207 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 208 | struct sk_buff *skb) |
c6c8fea2 | 209 | { |
56303d34 SE |
210 | struct batadv_hard_iface *primary_if = NULL; |
211 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
212 | struct batadv_icmp_header *icmph; |
213 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 214 | |
da6b8c20 | 215 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 216 | |
da6b8c20 SW |
217 | switch (icmph->msg_type) { |
218 | case BATADV_ECHO_REPLY: | |
219 | case BATADV_DESTINATION_UNREACHABLE: | |
220 | case BATADV_TTL_EXCEEDED: | |
221 | /* receive the packet */ | |
222 | if (skb_linearize(skb) < 0) | |
223 | break; | |
c6c8fea2 | 224 | |
da6b8c20 SW |
225 | batadv_socket_receive_packet(icmph, skb->len); |
226 | break; | |
227 | case BATADV_ECHO_REQUEST: | |
228 | /* answer echo request (ping) */ | |
229 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
230 | if (!primary_if) | |
231 | goto out; | |
232 | ||
233 | /* get routing information */ | |
234 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
235 | if (!orig_node) | |
236 | goto out; | |
237 | ||
238 | /* create a copy of the skb, if needed, to modify it. */ | |
239 | if (skb_cow(skb, ETH_HLEN) < 0) | |
240 | goto out; | |
241 | ||
242 | icmph = (struct batadv_icmp_header *)skb->data; | |
243 | ||
8fdd0153 AQ |
244 | ether_addr_copy(icmph->dst, icmph->orig); |
245 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 246 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 247 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
248 | |
249 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
250 | if (res != NET_XMIT_DROP) | |
251 | ret = NET_RX_SUCCESS; | |
252 | ||
253 | break; | |
254 | default: | |
255 | /* drop unknown type */ | |
44524fcd | 256 | goto out; |
da6b8c20 | 257 | } |
44524fcd | 258 | out: |
32ae9b22 | 259 | if (primary_if) |
e5d89254 | 260 | batadv_hardif_free_ref(primary_if); |
44524fcd | 261 | if (orig_node) |
7d211efc | 262 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
263 | return ret; |
264 | } | |
265 | ||
56303d34 | 266 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 267 | struct sk_buff *skb) |
c6c8fea2 | 268 | { |
56303d34 SE |
269 | struct batadv_hard_iface *primary_if = NULL; |
270 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 271 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 272 | int ret = NET_RX_DROP; |
c6c8fea2 | 273 | |
96412690 | 274 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
275 | |
276 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 277 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 278 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 279 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 280 | goto out; |
c6c8fea2 SE |
281 | } |
282 | ||
e5d89254 | 283 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 284 | if (!primary_if) |
44524fcd | 285 | goto out; |
c6c8fea2 SE |
286 | |
287 | /* get routing information */ | |
27a417e6 | 288 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 289 | if (!orig_node) |
e1a5382f | 290 | goto out; |
c6c8fea2 | 291 | |
44524fcd | 292 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 293 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 294 | goto out; |
c6c8fea2 | 295 | |
96412690 | 296 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 297 | |
8fdd0153 AQ |
298 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
299 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
300 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
301 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 302 | |
e91ecfc6 | 303 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 304 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 305 | |
44524fcd | 306 | out: |
32ae9b22 | 307 | if (primary_if) |
e5d89254 | 308 | batadv_hardif_free_ref(primary_if); |
44524fcd | 309 | if (orig_node) |
7d211efc | 310 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
311 | return ret; |
312 | } | |
313 | ||
56303d34 SE |
314 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
315 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 316 | { |
56303d34 | 317 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
318 | struct batadv_icmp_header *icmph; |
319 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 320 | struct ethhdr *ethhdr; |
56303d34 | 321 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 322 | int hdr_size = sizeof(struct batadv_icmp_header); |
44524fcd | 323 | int ret = NET_RX_DROP; |
c6c8fea2 | 324 | |
c6c8fea2 SE |
325 | /* drop packet if it has not necessary minimum size */ |
326 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 327 | goto out; |
c6c8fea2 | 328 | |
7ed4be95 | 329 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
330 | |
331 | /* packet with unicast indication but broadcast recipient */ | |
332 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 333 | goto out; |
c6c8fea2 SE |
334 | |
335 | /* packet with broadcast sender address */ | |
336 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 337 | goto out; |
c6c8fea2 SE |
338 | |
339 | /* not for me */ | |
fe8a93b9 | 340 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 341 | goto out; |
c6c8fea2 | 342 | |
da6b8c20 | 343 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
344 | |
345 | /* add record route information if not full */ | |
da6b8c20 SW |
346 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
347 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
348 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { | |
349 | if (skb_linearize(skb) < 0) | |
350 | goto out; | |
351 | ||
352 | /* create a copy of the skb, if needed, to modify it. */ | |
353 | if (skb_cow(skb, ETH_HLEN) < 0) | |
354 | goto out; | |
355 | ||
356 | icmph = (struct batadv_icmp_header *)skb->data; | |
357 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
358 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
359 | goto out; | |
360 | ||
8fdd0153 AQ |
361 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
362 | ethhdr->h_dest); | |
da6b8c20 | 363 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
364 | } |
365 | ||
366 | /* packet for me */ | |
da6b8c20 SW |
367 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
368 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
369 | |
370 | /* TTL exceeded */ | |
a40d9b07 | 371 | if (icmph->ttl < 2) |
63b01037 | 372 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 373 | |
c6c8fea2 | 374 | /* get routing information */ |
da6b8c20 | 375 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 376 | if (!orig_node) |
e1a5382f | 377 | goto out; |
c6c8fea2 | 378 | |
44524fcd | 379 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 380 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 381 | goto out; |
c6c8fea2 | 382 | |
da6b8c20 | 383 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 384 | |
44524fcd | 385 | /* decrement ttl */ |
a40d9b07 | 386 | icmph->ttl--; |
44524fcd ML |
387 | |
388 | /* route it */ | |
e91ecfc6 | 389 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 390 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 391 | |
44524fcd | 392 | out: |
44524fcd | 393 | if (orig_node) |
7d211efc | 394 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
395 | return ret; |
396 | } | |
397 | ||
f86ce0ad MH |
398 | /** |
399 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 400 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
401 | * @skb: packet to check |
402 | * @hdr_size: size of header to pull | |
403 | * | |
62fe710f SE |
404 | * Check for short header and bad addresses in given packet. |
405 | * | |
406 | * Return: negative value when check fails and 0 otherwise. The negative value | |
407 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
408 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 409 | */ |
fe8a93b9 AQ |
410 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
411 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
412 | { |
413 | struct ethhdr *ethhdr; | |
414 | ||
415 | /* drop packet if it has not necessary minimum size */ | |
416 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 417 | return -ENODATA; |
ff51fd70 | 418 | |
7ed4be95 | 419 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
420 | |
421 | /* packet with unicast indication but broadcast recipient */ | |
422 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 423 | return -EBADR; |
ff51fd70 MH |
424 | |
425 | /* packet with broadcast sender address */ | |
426 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 427 | return -EBADR; |
ff51fd70 MH |
428 | |
429 | /* not for me */ | |
fe8a93b9 | 430 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 431 | return -EREMOTE; |
ff51fd70 MH |
432 | |
433 | return 0; | |
434 | } | |
435 | ||
f6c8b711 SW |
436 | /** |
437 | * batadv_find_router - find a suitable router for this originator | |
438 | * @bat_priv: the bat priv with all the soft interface information | |
439 | * @orig_node: the destination node | |
440 | * @recv_if: pointer to interface this packet was received on | |
441 | * | |
62fe710f | 442 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 443 | * this interface, or NULL if not available. |
9cfc7bd6 | 444 | */ |
56303d34 SE |
445 | struct batadv_neigh_node * |
446 | batadv_find_router(struct batadv_priv *bat_priv, | |
447 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 448 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 449 | { |
f3b3d901 SW |
450 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
451 | struct batadv_neigh_node *first_candidate_router = NULL; | |
452 | struct batadv_neigh_node *next_candidate_router = NULL; | |
453 | struct batadv_neigh_node *router, *cand_router = NULL; | |
454 | struct batadv_neigh_node *last_cand_router = NULL; | |
455 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
456 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
457 | struct batadv_orig_ifinfo *last_candidate; | |
458 | bool last_candidate_found = false; | |
c6c8fea2 SE |
459 | |
460 | if (!orig_node) | |
461 | return NULL; | |
462 | ||
7351a482 | 463 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 464 | |
329887ad SW |
465 | if (!router) |
466 | return router; | |
467 | ||
f3b3d901 SW |
468 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
469 | * and if activated. | |
470 | */ | |
329887ad | 471 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
472 | return router; |
473 | ||
474 | /* bonding: loop through the list of possible routers found | |
475 | * for the various outgoing interfaces and find a candidate after | |
476 | * the last chosen bonding candidate (next_candidate). If no such | |
477 | * router is found, use the first candidate found (the previously | |
478 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 479 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
480 | * router - obviously there are no other candidates. |
481 | */ | |
482 | rcu_read_lock(); | |
483 | last_candidate = orig_node->last_bonding_candidate; | |
484 | if (last_candidate) | |
485 | last_cand_router = rcu_dereference(last_candidate->router); | |
486 | ||
487 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
488 | /* acquire some structures and references ... */ | |
489 | if (!atomic_inc_not_zero(&cand->refcount)) | |
490 | continue; | |
491 | ||
492 | cand_router = rcu_dereference(cand->router); | |
493 | if (!cand_router) | |
494 | goto next; | |
495 | ||
496 | if (!atomic_inc_not_zero(&cand_router->refcount)) { | |
497 | cand_router = NULL; | |
498 | goto next; | |
499 | } | |
500 | ||
501 | /* alternative candidate should be good enough to be | |
502 | * considered | |
503 | */ | |
18165f6f SW |
504 | if (!bao->bat_neigh_is_similar_or_better(cand_router, |
505 | cand->if_outgoing, | |
506 | router, recv_if)) | |
f3b3d901 SW |
507 | goto next; |
508 | ||
509 | /* don't use the same router twice */ | |
510 | if (last_cand_router == cand_router) | |
511 | goto next; | |
512 | ||
513 | /* mark the first possible candidate */ | |
514 | if (!first_candidate) { | |
515 | atomic_inc(&cand_router->refcount); | |
516 | atomic_inc(&cand->refcount); | |
517 | first_candidate = cand; | |
518 | first_candidate_router = cand_router; | |
519 | } | |
520 | ||
521 | /* check if the loop has already passed the previously selected | |
522 | * candidate ... this function should select the next candidate | |
523 | * AFTER the previously used bonding candidate. | |
524 | */ | |
525 | if (!last_candidate || last_candidate_found) { | |
526 | next_candidate = cand; | |
527 | next_candidate_router = cand_router; | |
528 | break; | |
529 | } | |
530 | ||
531 | if (last_candidate == cand) | |
532 | last_candidate_found = true; | |
533 | next: | |
534 | /* free references */ | |
535 | if (cand_router) { | |
536 | batadv_neigh_node_free_ref(cand_router); | |
537 | cand_router = NULL; | |
538 | } | |
539 | batadv_orig_ifinfo_free_ref(cand); | |
540 | } | |
541 | rcu_read_unlock(); | |
542 | ||
543 | /* last_bonding_candidate is reset below, remove the old reference. */ | |
544 | if (orig_node->last_bonding_candidate) | |
545 | batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); | |
546 | ||
547 | /* After finding candidates, handle the three cases: | |
548 | * 1) there is a next candidate, use that | |
549 | * 2) there is no next candidate, use the first of the list | |
550 | * 3) there is no candidate at all, return the default router | |
551 | */ | |
552 | if (next_candidate) { | |
553 | batadv_neigh_node_free_ref(router); | |
554 | ||
555 | /* remove references to first candidate, we don't need it. */ | |
556 | if (first_candidate) { | |
557 | batadv_neigh_node_free_ref(first_candidate_router); | |
558 | batadv_orig_ifinfo_free_ref(first_candidate); | |
559 | } | |
560 | router = next_candidate_router; | |
561 | orig_node->last_bonding_candidate = next_candidate; | |
562 | } else if (first_candidate) { | |
563 | batadv_neigh_node_free_ref(router); | |
564 | ||
565 | /* refcounting has already been done in the loop above. */ | |
566 | router = first_candidate_router; | |
567 | orig_node->last_bonding_candidate = first_candidate; | |
568 | } else { | |
569 | orig_node->last_bonding_candidate = NULL; | |
570 | } | |
f6c8b711 | 571 | |
c6c8fea2 SE |
572 | return router; |
573 | } | |
574 | ||
63b01037 | 575 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 576 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 577 | { |
56303d34 SE |
578 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
579 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 580 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 581 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 582 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 583 | |
96412690 | 584 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
585 | |
586 | /* TTL exceeded */ | |
a40d9b07 | 587 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
588 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
589 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 590 | goto out; |
c6c8fea2 SE |
591 | } |
592 | ||
593 | /* get routing information */ | |
da641193 | 594 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 595 | |
44524fcd | 596 | if (!orig_node) |
b5a6f69c | 597 | goto out; |
c6c8fea2 | 598 | |
c6c8fea2 | 599 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 600 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 601 | goto out; |
c6c8fea2 | 602 | |
c6c8fea2 | 603 | /* decrement ttl */ |
f097e25d | 604 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 605 | unicast_packet->ttl--; |
c6c8fea2 | 606 | |
a40d9b07 | 607 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
608 | case BATADV_UNICAST_4ADDR: |
609 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
610 | break; | |
611 | case BATADV_UNICAST: | |
612 | hdr_len = sizeof(struct batadv_unicast_packet); | |
613 | break; | |
614 | default: | |
615 | /* other packet types not supported - yet */ | |
616 | hdr_len = -1; | |
617 | break; | |
618 | } | |
619 | ||
620 | if (hdr_len > 0) | |
621 | batadv_skb_set_priority(skb, hdr_len); | |
622 | ||
e91ecfc6 | 623 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 624 | |
e91ecfc6 MH |
625 | /* translate transmit result into receive result */ |
626 | if (res == NET_XMIT_SUCCESS) { | |
627 | /* skb was transmitted and consumed */ | |
95332477 MH |
628 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
629 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
630 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
631 | |
632 | ret = NET_RX_SUCCESS; | |
633 | } else if (res == NET_XMIT_POLICED) { | |
634 | /* skb was buffered and consumed */ | |
635 | ret = NET_RX_SUCCESS; | |
95332477 | 636 | } |
c6c8fea2 | 637 | |
44524fcd | 638 | out: |
44524fcd | 639 | if (orig_node) |
7d211efc | 640 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 641 | return ret; |
c6c8fea2 SE |
642 | } |
643 | ||
7c1fd91d AQ |
644 | /** |
645 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
646 | * @bat_priv: the bat priv with all the soft interface information | |
647 | * @unicast_packet: the unicast header to be updated | |
648 | * @dst_addr: the payload destination | |
c018ad3d | 649 | * @vid: VLAN identifier |
7c1fd91d AQ |
650 | * |
651 | * Search the translation table for dst_addr and update the unicast header with | |
652 | * the new corresponding information (originator address where the destination | |
653 | * client currently is and its known TTVN) | |
654 | * | |
62fe710f | 655 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
656 | */ |
657 | static bool | |
658 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
659 | struct batadv_unicast_packet *unicast_packet, | |
6b5e971a | 660 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
661 | { |
662 | struct batadv_orig_node *orig_node = NULL; | |
663 | struct batadv_hard_iface *primary_if = NULL; | |
664 | bool ret = false; | |
6b5e971a | 665 | u8 *orig_addr, orig_ttvn; |
7c1fd91d | 666 | |
c018ad3d | 667 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
668 | primary_if = batadv_primary_if_get_selected(bat_priv); |
669 | if (!primary_if) | |
670 | goto out; | |
671 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 672 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 673 | } else { |
c018ad3d AQ |
674 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
675 | vid); | |
7c1fd91d AQ |
676 | if (!orig_node) |
677 | goto out; | |
678 | ||
679 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
680 | goto out; | |
681 | ||
682 | orig_addr = orig_node->orig; | |
6b5e971a | 683 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
684 | } |
685 | ||
686 | /* update the packet header */ | |
8fdd0153 | 687 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d AQ |
688 | unicast_packet->ttvn = orig_ttvn; |
689 | ||
690 | ret = true; | |
691 | out: | |
692 | if (primary_if) | |
693 | batadv_hardif_free_ref(primary_if); | |
694 | if (orig_node) | |
695 | batadv_orig_node_free_ref(orig_node); | |
696 | ||
697 | return ret; | |
698 | } | |
699 | ||
56303d34 | 700 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 701 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
702 | struct batadv_unicast_packet *unicast_packet; |
703 | struct batadv_hard_iface *primary_if; | |
56303d34 | 704 | struct batadv_orig_node *orig_node; |
6b5e971a | 705 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 706 | struct ethhdr *ethhdr; |
c018ad3d | 707 | unsigned short vid; |
3e34819e | 708 | int is_old_ttvn; |
a73105b8 | 709 | |
b8fcfa42 | 710 | /* check if there is enough data before accessing it */ |
f1791425 | 711 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
b8fcfa42 AQ |
712 | return 0; |
713 | ||
714 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
715 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
716 | return 0; |
717 | ||
96412690 | 718 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 719 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 720 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 721 | |
7c1fd91d AQ |
722 | /* check if the destination client was served by this node and it is now |
723 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
724 | * message and that it knows the new destination in the mesh to re-route | |
725 | * the packet to | |
726 | */ | |
c018ad3d | 727 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 728 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 729 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
730 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
731 | bat_priv, | |
732 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
733 | unicast_packet->dest, | |
734 | ethhdr->h_dest); | |
7c1fd91d AQ |
735 | /* at this point the mesh destination should have been |
736 | * substituted with the originator address found in the global | |
737 | * table. If not, let the packet go untouched anyway because | |
738 | * there is nothing the node can do | |
739 | */ | |
740 | return 1; | |
741 | } | |
742 | ||
743 | /* retrieve the TTVN known by this node for the packet destination. This | |
744 | * value is used later to check if the node which sent (or re-routed | |
745 | * last time) the packet had an updated information or not | |
746 | */ | |
6b5e971a | 747 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 748 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
749 | orig_node = batadv_orig_hash_find(bat_priv, |
750 | unicast_packet->dest); | |
7c1fd91d AQ |
751 | /* if it is not possible to find the orig_node representing the |
752 | * destination, the packet can immediately be dropped as it will | |
753 | * not be possible to deliver it | |
754 | */ | |
a73105b8 AQ |
755 | if (!orig_node) |
756 | return 0; | |
757 | ||
6b5e971a | 758 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7d211efc | 759 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
760 | } |
761 | ||
7c1fd91d AQ |
762 | /* check if the TTVN contained in the packet is fresher than what the |
763 | * node knows | |
764 | */ | |
3e34819e | 765 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
766 | if (!is_old_ttvn) |
767 | return 1; | |
a73105b8 | 768 | |
7c1fd91d AQ |
769 | old_ttvn = unicast_packet->ttvn; |
770 | /* the packet was forged based on outdated network information. Its | |
771 | * destination can possibly be updated and forwarded towards the new | |
772 | * target host | |
773 | */ | |
774 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 775 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
776 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
777 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
778 | unicast_packet->dest, ethhdr->h_dest, | |
779 | old_ttvn, curr_ttvn); | |
7c1fd91d AQ |
780 | return 1; |
781 | } | |
3275e7cc | 782 | |
7c1fd91d AQ |
783 | /* the packet has not been re-routed: either the destination is |
784 | * currently served by this node or there is no destination at all and | |
785 | * it is possible to drop the packet | |
786 | */ | |
c018ad3d | 787 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 788 | return 0; |
3275e7cc | 789 | |
7c1fd91d AQ |
790 | /* update the header in order to let the packet be delivered to this |
791 | * node's soft interface | |
792 | */ | |
793 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
794 | if (!primary_if) | |
795 | return 0; | |
a73105b8 | 796 | |
8fdd0153 | 797 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91d AQ |
798 | |
799 | batadv_hardif_free_ref(primary_if); | |
800 | ||
801 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 802 | |
a73105b8 AQ |
803 | return 1; |
804 | } | |
805 | ||
a1f1ac5c SW |
806 | /** |
807 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
808 | * are in the unicast number space but not yet known to the implementation | |
809 | * @skb: unicast tvlv packet to process | |
810 | * @recv_if: pointer to interface this packet was received on | |
811 | * | |
62fe710f | 812 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
813 | * otherwise. |
814 | */ | |
815 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
816 | struct batadv_hard_iface *recv_if) | |
817 | { | |
818 | struct batadv_unicast_packet *unicast_packet; | |
819 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
820 | int check, hdr_size = sizeof(*unicast_packet); | |
821 | ||
822 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
823 | if (check < 0) | |
824 | return NET_RX_DROP; | |
825 | ||
826 | /* we don't know about this type, drop it. */ | |
827 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
828 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
829 | return NET_RX_DROP; | |
830 | ||
831 | return batadv_route_unicast_packet(skb, recv_if); | |
832 | } | |
833 | ||
56303d34 SE |
834 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
835 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 836 | { |
56303d34 | 837 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 838 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 839 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
6b5e971a | 840 | u8 *orig_addr; |
9affec6b | 841 | struct batadv_orig_node *orig_node = NULL; |
612d2b4f | 842 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 843 | enum batadv_subtype subtype; |
c384ea3e | 844 | bool is4addr; |
c6c8fea2 | 845 | |
7cdcf6dd | 846 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 847 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 848 | |
a40d9b07 | 849 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 850 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 851 | if (is4addr) |
4046b24a | 852 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 853 | |
612d2b4f | 854 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 855 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
856 | |
857 | /* Even though the packet is not for us, we might save it to use for | |
858 | * decoding a later received coded packet | |
859 | */ | |
860 | if (check == -EREMOTE) | |
861 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
862 | ||
863 | if (check < 0) | |
c6c8fea2 | 864 | return NET_RX_DROP; |
dd981ab0 | 865 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
866 | return NET_RX_DROP; |
867 | ||
c6c8fea2 | 868 | /* packet for me */ |
fe8a93b9 | 869 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 870 | if (is4addr) { |
437bb0e6 SW |
871 | subtype = unicast_4addr_packet->subtype; |
872 | batadv_dat_inc_counter(bat_priv, subtype); | |
873 | ||
874 | /* Only payload data should be considered for speedy | |
875 | * join. For example, DAT also uses unicast 4addr | |
876 | * types, but those packets should not be considered | |
877 | * for speedy join, since the clients do not actually | |
878 | * reside at the sending originator. | |
879 | */ | |
880 | if (subtype == BATADV_P_DATA) { | |
881 | orig_addr = unicast_4addr_packet->src; | |
882 | orig_node = batadv_orig_hash_find(bat_priv, | |
883 | orig_addr); | |
884 | } | |
9affec6b | 885 | } |
4046b24a | 886 | |
c384ea3e AQ |
887 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
888 | hdr_size)) | |
889 | goto rx_success; | |
890 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
891 | hdr_size)) | |
892 | goto rx_success; | |
893 | ||
37135173 | 894 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 895 | orig_node); |
37135173 | 896 | |
c384ea3e | 897 | rx_success: |
9affec6b AQ |
898 | if (orig_node) |
899 | batadv_orig_node_free_ref(orig_node); | |
900 | ||
c6c8fea2 SE |
901 | return NET_RX_SUCCESS; |
902 | } | |
903 | ||
63b01037 | 904 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
905 | } |
906 | ||
ef261577 ML |
907 | /** |
908 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
909 | * @skb: unicast tvlv packet to process | |
910 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 911 | * |
62fe710f | 912 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
913 | * otherwise. |
914 | */ | |
915 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
916 | struct batadv_hard_iface *recv_if) | |
917 | { | |
918 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
919 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
920 | unsigned char *tvlv_buff; | |
6b5e971a | 921 | u16 tvlv_buff_len; |
ef261577 ML |
922 | int hdr_size = sizeof(*unicast_tvlv_packet); |
923 | int ret = NET_RX_DROP; | |
924 | ||
925 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
926 | return NET_RX_DROP; | |
927 | ||
928 | /* the header is likely to be modified while forwarding */ | |
929 | if (skb_cow(skb, hdr_size) < 0) | |
930 | return NET_RX_DROP; | |
931 | ||
932 | /* packet needs to be linearized to access the tvlv content */ | |
933 | if (skb_linearize(skb) < 0) | |
934 | return NET_RX_DROP; | |
935 | ||
936 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
937 | ||
938 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
939 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
940 | ||
941 | if (tvlv_buff_len > skb->len - hdr_size) | |
942 | return NET_RX_DROP; | |
943 | ||
944 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
945 | unicast_tvlv_packet->src, | |
946 | unicast_tvlv_packet->dst, | |
947 | tvlv_buff, tvlv_buff_len); | |
948 | ||
949 | if (ret != NET_RX_SUCCESS) | |
950 | ret = batadv_route_unicast_packet(skb, recv_if); | |
05c3c8a6 AQ |
951 | else |
952 | consume_skb(skb); | |
ef261577 ML |
953 | |
954 | return ret; | |
955 | } | |
c6c8fea2 | 956 | |
610bfc6b MH |
957 | /** |
958 | * batadv_recv_frag_packet - process received fragment | |
959 | * @skb: the received fragment | |
960 | * @recv_if: interface that the skb is received on | |
961 | * | |
962 | * This function does one of the three following things: 1) Forward fragment, if | |
963 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
964 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
965 | * | |
62fe710f | 966 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
967 | */ |
968 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
969 | struct batadv_hard_iface *recv_if) | |
970 | { | |
971 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
972 | struct batadv_orig_node *orig_node_src = NULL; | |
973 | struct batadv_frag_packet *frag_packet; | |
974 | int ret = NET_RX_DROP; | |
975 | ||
976 | if (batadv_check_unicast_packet(bat_priv, skb, | |
977 | sizeof(*frag_packet)) < 0) | |
978 | goto out; | |
979 | ||
980 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
981 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
982 | if (!orig_node_src) | |
983 | goto out; | |
984 | ||
985 | /* Route the fragment if it is not for us and too big to be merged. */ | |
986 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
987 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
988 | ret = NET_RX_SUCCESS; | |
989 | goto out; | |
990 | } | |
991 | ||
992 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
993 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
994 | ||
995 | /* Add fragment to buffer and merge if possible. */ | |
996 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
997 | goto out; | |
998 | ||
999 | /* Deliver merged packet to the appropriate handler, if it was | |
1000 | * merged | |
1001 | */ | |
1002 | if (skb) | |
1003 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1004 | &recv_if->batman_adv_ptype, NULL); | |
1005 | ||
1006 | ret = NET_RX_SUCCESS; | |
1007 | ||
1008 | out: | |
1009 | if (orig_node_src) | |
1010 | batadv_orig_node_free_ref(orig_node_src); | |
1011 | ||
1012 | return ret; | |
1013 | } | |
1014 | ||
56303d34 SE |
1015 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1016 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1017 | { |
56303d34 SE |
1018 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1019 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1020 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1021 | struct ethhdr *ethhdr; |
704509b8 | 1022 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1023 | int ret = NET_RX_DROP; |
6b5e971a SE |
1024 | s32 seq_diff; |
1025 | u32 seqno; | |
c6c8fea2 SE |
1026 | |
1027 | /* drop packet if it has not necessary minimum size */ | |
1028 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1029 | goto out; |
c6c8fea2 | 1030 | |
7ed4be95 | 1031 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1032 | |
1033 | /* packet with broadcast indication but unicast recipient */ | |
1034 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1035 | goto out; |
c6c8fea2 SE |
1036 | |
1037 | /* packet with broadcast sender address */ | |
1038 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1039 | goto out; |
c6c8fea2 SE |
1040 | |
1041 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1042 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1043 | goto out; |
c6c8fea2 | 1044 | |
96412690 | 1045 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1046 | |
1047 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1048 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1049 | goto out; |
c6c8fea2 | 1050 | |
a40d9b07 | 1051 | if (bcast_packet->ttl < 2) |
f3e0008f | 1052 | goto out; |
c6c8fea2 | 1053 | |
da641193 | 1054 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1055 | |
1056 | if (!orig_node) | |
b5a6f69c | 1057 | goto out; |
c6c8fea2 | 1058 | |
f3e0008f | 1059 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1060 | |
3fba7325 | 1061 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1062 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1063 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1064 | seqno)) |
f3e0008f | 1065 | goto spin_unlock; |
c6c8fea2 | 1066 | |
3fba7325 | 1067 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1068 | |
1069 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1070 | if (batadv_window_protected(bat_priv, seq_diff, |
1071 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1072 | goto spin_unlock; |
c6c8fea2 SE |
1073 | |
1074 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1075 | * if required. |
1076 | */ | |
0f5f9322 | 1077 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1078 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1079 | |
f3e0008f | 1080 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1081 | |
fe2da6ff | 1082 | /* check whether this has been sent by another originator before */ |
004e86fc | 1083 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1084 | goto out; |
1085 | ||
c54f38c9 SW |
1086 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1087 | ||
c6c8fea2 | 1088 | /* rebroadcast packet */ |
9455e34c | 1089 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1090 | |
23721387 SW |
1091 | /* don't hand the broadcast up if it is from an originator |
1092 | * from the same backbone. | |
1093 | */ | |
08adf151 | 1094 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1095 | goto out; |
1096 | ||
c384ea3e AQ |
1097 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1098 | goto rx_success; | |
1099 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1100 | goto rx_success; | |
1101 | ||
c6c8fea2 | 1102 | /* broadcast for me */ |
37135173 AQ |
1103 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1104 | orig_node); | |
c384ea3e AQ |
1105 | |
1106 | rx_success: | |
f3e0008f ML |
1107 | ret = NET_RX_SUCCESS; |
1108 | goto out; | |
c6c8fea2 | 1109 | |
f3e0008f ML |
1110 | spin_unlock: |
1111 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1112 | out: |
1113 | if (orig_node) | |
7d211efc | 1114 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1115 | return ret; |
c6c8fea2 | 1116 | } |