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