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0046b040 | 1 | /* Copyright (C) 2007-2016 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> | |
a6ba0d34 | 28 | #include <linux/kref.h> |
1e2c2a4f SE |
29 | #include <linux/netdevice.h> |
30 | #include <linux/printk.h> | |
31 | #include <linux/rculist.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/stddef.h> | |
36 | ||
37 | #include "bitarray.h" | |
23721387 | 38 | #include "bridge_loop_avoidance.h" |
c384ea3e | 39 | #include "distributed-arp-table.h" |
610bfc6b | 40 | #include "fragmentation.h" |
1e2c2a4f SE |
41 | #include "hard-interface.h" |
42 | #include "icmp_socket.h" | |
43 | #include "network-coding.h" | |
44 | #include "originator.h" | |
45 | #include "packet.h" | |
46 | #include "send.h" | |
47 | #include "soft-interface.h" | |
48 | #include "translation-table.h" | |
c018ad3d | 49 | |
63b01037 | 50 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 51 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 52 | |
7351a482 SW |
53 | /** |
54 | * _batadv_update_route - set the router for this originator | |
55 | * @bat_priv: the bat priv with all the soft interface information | |
56 | * @orig_node: orig node which is to be configured | |
57 | * @recv_if: the receive interface for which this route is set | |
58 | * @neigh_node: neighbor which should be the next router | |
59 | * | |
60 | * This function does not perform any error checks | |
61 | */ | |
56303d34 SE |
62 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
63 | struct batadv_orig_node *orig_node, | |
7351a482 | 64 | struct batadv_hard_iface *recv_if, |
56303d34 | 65 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 66 | { |
7351a482 | 67 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 68 | struct batadv_neigh_node *curr_router; |
e1a5382f | 69 | |
7351a482 SW |
70 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
71 | if (!orig_ifinfo) | |
72 | return; | |
73 | ||
74 | rcu_read_lock(); | |
75 | curr_router = rcu_dereference(orig_ifinfo->router); | |
77ae32e8 | 76 | if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) |
7351a482 SW |
77 | curr_router = NULL; |
78 | rcu_read_unlock(); | |
a8e7f4bc | 79 | |
c6c8fea2 | 80 | /* route deleted */ |
e1a5382f | 81 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
82 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
83 | "Deleting route towards: %pM\n", orig_node->orig); | |
95fb130d | 84 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 85 | "Deleted route towards originator"); |
c6c8fea2 | 86 | |
e1a5382f LL |
87 | /* route added */ |
88 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 89 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
90 | "Adding route towards: %pM (via %pM)\n", |
91 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 92 | /* route changed */ |
bb899b89 | 93 | } else if (neigh_node && curr_router) { |
39c75a51 | 94 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
95 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
96 | orig_node->orig, neigh_node->addr, | |
97 | curr_router->addr); | |
c6c8fea2 SE |
98 | } |
99 | ||
e1a5382f | 100 | if (curr_router) |
7d211efc | 101 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
102 | |
103 | /* increase refcount of new best neighbor */ | |
77ae32e8 | 104 | if (neigh_node && !kref_get_unless_zero(&neigh_node->refcount)) |
44524fcd | 105 | neigh_node = NULL; |
e1a5382f LL |
106 | |
107 | spin_lock_bh(&orig_node->neigh_list_lock); | |
7351a482 | 108 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
e1a5382f | 109 | spin_unlock_bh(&orig_node->neigh_list_lock); |
7351a482 | 110 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
e1a5382f LL |
111 | |
112 | /* decrease refcount of previous best neighbor */ | |
113 | if (curr_router) | |
7d211efc | 114 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
115 | } |
116 | ||
7351a482 SW |
117 | /** |
118 | * batadv_update_route - set the router for this originator | |
119 | * @bat_priv: the bat priv with all the soft interface information | |
120 | * @orig_node: orig node which is to be configured | |
121 | * @recv_if: the receive interface for which this route is set | |
122 | * @neigh_node: neighbor which should be the next router | |
123 | */ | |
56303d34 SE |
124 | void batadv_update_route(struct batadv_priv *bat_priv, |
125 | struct batadv_orig_node *orig_node, | |
7351a482 | 126 | struct batadv_hard_iface *recv_if, |
56303d34 | 127 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 128 | { |
56303d34 | 129 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
130 | |
131 | if (!orig_node) | |
e1a5382f LL |
132 | goto out; |
133 | ||
7351a482 | 134 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 135 | |
e1a5382f | 136 | if (router != neigh_node) |
7351a482 | 137 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
138 | |
139 | out: | |
140 | if (router) | |
7d211efc | 141 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
142 | } |
143 | ||
62fe710f | 144 | /** |
7afcbbef | 145 | * batadv_window_protected - checks whether the host restarted and is in the |
62fe710f | 146 | * protection time. |
7afcbbef SE |
147 | * @bat_priv: the bat priv with all the soft interface information |
148 | * @seq_num_diff: difference between the current/received sequence number and | |
149 | * the last sequence number | |
81f02683 | 150 | * @seq_old_max_diff: maximum age of sequence number not considered as restart |
7afcbbef SE |
151 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
152 | * is detected | |
81f02683 SW |
153 | * @protection_started: is set to true if the protection window was started, |
154 | * doesn't change otherwise. | |
62fe710f SE |
155 | * |
156 | * Return: | |
157 | * 0 if the packet is to be accepted. | |
c6c8fea2 SE |
158 | * 1 if the packet is to be ignored. |
159 | */ | |
6b5e971a | 160 | int batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
81f02683 SW |
161 | s32 seq_old_max_diff, unsigned long *last_reset, |
162 | bool *protection_started) | |
c6c8fea2 | 163 | { |
81f02683 | 164 | if (seq_num_diff <= -seq_old_max_diff || |
42d0b044 SE |
165 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
166 | if (!batadv_has_timed_out(*last_reset, | |
167 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 168 | return 1; |
8c7bf248 ML |
169 | |
170 | *last_reset = jiffies; | |
81f02683 SW |
171 | if (protection_started) |
172 | *protection_started = true; | |
39c75a51 | 173 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 174 | "old packet received, start protection\n"); |
c6c8fea2 | 175 | } |
8c7bf248 | 176 | |
c6c8fea2 SE |
177 | return 0; |
178 | } | |
179 | ||
30d3c511 | 180 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 181 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 182 | int header_len) |
c6c8fea2 | 183 | { |
c6c8fea2 SE |
184 | struct ethhdr *ethhdr; |
185 | ||
186 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
187 | if (unlikely(!pskb_may_pull(skb, header_len))) |
188 | return false; | |
c6c8fea2 | 189 | |
7ed4be95 | 190 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
191 | |
192 | /* packet with broadcast indication but unicast recipient */ | |
193 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 194 | return false; |
c6c8fea2 SE |
195 | |
196 | /* packet with broadcast sender address */ | |
197 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 198 | return false; |
c6c8fea2 SE |
199 | |
200 | /* create a copy of the skb, if needed, to modify it. */ | |
201 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 202 | return false; |
c6c8fea2 SE |
203 | |
204 | /* keep skb linear */ | |
205 | if (skb_linearize(skb) < 0) | |
c3e29312 | 206 | return false; |
c6c8fea2 | 207 | |
c3e29312 | 208 | return true; |
c6c8fea2 SE |
209 | } |
210 | ||
da6b8c20 SW |
211 | /** |
212 | * batadv_recv_my_icmp_packet - receive an icmp packet locally | |
213 | * @bat_priv: the bat priv with all the soft interface information | |
214 | * @skb: icmp packet to process | |
215 | * | |
62fe710f | 216 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
da6b8c20 SW |
217 | * otherwise. |
218 | */ | |
56303d34 | 219 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 220 | struct sk_buff *skb) |
c6c8fea2 | 221 | { |
56303d34 SE |
222 | struct batadv_hard_iface *primary_if = NULL; |
223 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
224 | struct batadv_icmp_header *icmph; |
225 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 226 | |
da6b8c20 | 227 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 228 | |
da6b8c20 SW |
229 | switch (icmph->msg_type) { |
230 | case BATADV_ECHO_REPLY: | |
231 | case BATADV_DESTINATION_UNREACHABLE: | |
232 | case BATADV_TTL_EXCEEDED: | |
233 | /* receive the packet */ | |
234 | if (skb_linearize(skb) < 0) | |
235 | break; | |
c6c8fea2 | 236 | |
da6b8c20 SW |
237 | batadv_socket_receive_packet(icmph, skb->len); |
238 | break; | |
239 | case BATADV_ECHO_REQUEST: | |
240 | /* answer echo request (ping) */ | |
241 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
242 | if (!primary_if) | |
243 | goto out; | |
244 | ||
245 | /* get routing information */ | |
246 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
247 | if (!orig_node) | |
248 | goto out; | |
249 | ||
250 | /* create a copy of the skb, if needed, to modify it. */ | |
251 | if (skb_cow(skb, ETH_HLEN) < 0) | |
252 | goto out; | |
253 | ||
254 | icmph = (struct batadv_icmp_header *)skb->data; | |
255 | ||
8fdd0153 AQ |
256 | ether_addr_copy(icmph->dst, icmph->orig); |
257 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 258 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 259 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
260 | |
261 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
262 | if (res != NET_XMIT_DROP) | |
263 | ret = NET_RX_SUCCESS; | |
264 | ||
265 | break; | |
266 | default: | |
267 | /* drop unknown type */ | |
44524fcd | 268 | goto out; |
da6b8c20 | 269 | } |
44524fcd | 270 | out: |
32ae9b22 | 271 | if (primary_if) |
82047ad7 | 272 | batadv_hardif_put(primary_if); |
44524fcd | 273 | if (orig_node) |
5d967310 | 274 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
275 | return ret; |
276 | } | |
277 | ||
56303d34 | 278 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 279 | struct sk_buff *skb) |
c6c8fea2 | 280 | { |
56303d34 SE |
281 | struct batadv_hard_iface *primary_if = NULL; |
282 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 283 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 284 | int ret = NET_RX_DROP; |
c6c8fea2 | 285 | |
96412690 | 286 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
287 | |
288 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 289 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 290 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 291 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 292 | goto out; |
c6c8fea2 SE |
293 | } |
294 | ||
e5d89254 | 295 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 296 | if (!primary_if) |
44524fcd | 297 | goto out; |
c6c8fea2 SE |
298 | |
299 | /* get routing information */ | |
27a417e6 | 300 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 301 | if (!orig_node) |
e1a5382f | 302 | goto out; |
c6c8fea2 | 303 | |
44524fcd | 304 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 305 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 306 | goto out; |
c6c8fea2 | 307 | |
96412690 | 308 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 309 | |
8fdd0153 AQ |
310 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
311 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
312 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
313 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 314 | |
e91ecfc6 | 315 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 316 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 317 | |
44524fcd | 318 | out: |
32ae9b22 | 319 | if (primary_if) |
82047ad7 | 320 | batadv_hardif_put(primary_if); |
44524fcd | 321 | if (orig_node) |
5d967310 | 322 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
323 | return ret; |
324 | } | |
325 | ||
56303d34 SE |
326 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
327 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 328 | { |
56303d34 | 329 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
330 | struct batadv_icmp_header *icmph; |
331 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 332 | struct ethhdr *ethhdr; |
56303d34 | 333 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 334 | int hdr_size = sizeof(struct batadv_icmp_header); |
44524fcd | 335 | int ret = NET_RX_DROP; |
c6c8fea2 | 336 | |
c6c8fea2 SE |
337 | /* drop packet if it has not necessary minimum size */ |
338 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 339 | goto out; |
c6c8fea2 | 340 | |
7ed4be95 | 341 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
342 | |
343 | /* packet with unicast indication but broadcast recipient */ | |
344 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 345 | goto out; |
c6c8fea2 SE |
346 | |
347 | /* packet with broadcast sender address */ | |
348 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 349 | goto out; |
c6c8fea2 SE |
350 | |
351 | /* not for me */ | |
fe8a93b9 | 352 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 353 | goto out; |
c6c8fea2 | 354 | |
da6b8c20 | 355 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
356 | |
357 | /* add record route information if not full */ | |
da6b8c20 SW |
358 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
359 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
360 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { | |
361 | if (skb_linearize(skb) < 0) | |
362 | goto out; | |
363 | ||
364 | /* create a copy of the skb, if needed, to modify it. */ | |
365 | if (skb_cow(skb, ETH_HLEN) < 0) | |
366 | goto out; | |
367 | ||
368 | icmph = (struct batadv_icmp_header *)skb->data; | |
369 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
370 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
371 | goto out; | |
372 | ||
8fdd0153 AQ |
373 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
374 | ethhdr->h_dest); | |
da6b8c20 | 375 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
376 | } |
377 | ||
378 | /* packet for me */ | |
da6b8c20 SW |
379 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
380 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
381 | |
382 | /* TTL exceeded */ | |
a40d9b07 | 383 | if (icmph->ttl < 2) |
63b01037 | 384 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 385 | |
c6c8fea2 | 386 | /* get routing information */ |
da6b8c20 | 387 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 388 | if (!orig_node) |
e1a5382f | 389 | goto out; |
c6c8fea2 | 390 | |
44524fcd | 391 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 392 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 393 | goto out; |
c6c8fea2 | 394 | |
da6b8c20 | 395 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 396 | |
44524fcd | 397 | /* decrement ttl */ |
a40d9b07 | 398 | icmph->ttl--; |
44524fcd ML |
399 | |
400 | /* route it */ | |
e91ecfc6 | 401 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 402 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 403 | |
44524fcd | 404 | out: |
44524fcd | 405 | if (orig_node) |
5d967310 | 406 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
407 | return ret; |
408 | } | |
409 | ||
f86ce0ad MH |
410 | /** |
411 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 412 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
413 | * @skb: packet to check |
414 | * @hdr_size: size of header to pull | |
415 | * | |
62fe710f SE |
416 | * Check for short header and bad addresses in given packet. |
417 | * | |
418 | * Return: negative value when check fails and 0 otherwise. The negative value | |
419 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
420 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 421 | */ |
fe8a93b9 AQ |
422 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
423 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
424 | { |
425 | struct ethhdr *ethhdr; | |
426 | ||
427 | /* drop packet if it has not necessary minimum size */ | |
428 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 429 | return -ENODATA; |
ff51fd70 | 430 | |
7ed4be95 | 431 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
432 | |
433 | /* packet with unicast indication but broadcast recipient */ | |
434 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 435 | return -EBADR; |
ff51fd70 MH |
436 | |
437 | /* packet with broadcast sender address */ | |
438 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 439 | return -EBADR; |
ff51fd70 MH |
440 | |
441 | /* not for me */ | |
fe8a93b9 | 442 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 443 | return -EREMOTE; |
ff51fd70 MH |
444 | |
445 | return 0; | |
446 | } | |
447 | ||
f6c8b711 SW |
448 | /** |
449 | * batadv_find_router - find a suitable router for this originator | |
450 | * @bat_priv: the bat priv with all the soft interface information | |
451 | * @orig_node: the destination node | |
452 | * @recv_if: pointer to interface this packet was received on | |
453 | * | |
62fe710f | 454 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 455 | * this interface, or NULL if not available. |
9cfc7bd6 | 456 | */ |
56303d34 SE |
457 | struct batadv_neigh_node * |
458 | batadv_find_router(struct batadv_priv *bat_priv, | |
459 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 460 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 461 | { |
f3b3d901 SW |
462 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
463 | struct batadv_neigh_node *first_candidate_router = NULL; | |
464 | struct batadv_neigh_node *next_candidate_router = NULL; | |
465 | struct batadv_neigh_node *router, *cand_router = NULL; | |
466 | struct batadv_neigh_node *last_cand_router = NULL; | |
467 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
468 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
469 | struct batadv_orig_ifinfo *last_candidate; | |
470 | bool last_candidate_found = false; | |
c6c8fea2 SE |
471 | |
472 | if (!orig_node) | |
473 | return NULL; | |
474 | ||
7351a482 | 475 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 476 | |
329887ad SW |
477 | if (!router) |
478 | return router; | |
479 | ||
f3b3d901 SW |
480 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
481 | * and if activated. | |
482 | */ | |
329887ad | 483 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
484 | return router; |
485 | ||
486 | /* bonding: loop through the list of possible routers found | |
487 | * for the various outgoing interfaces and find a candidate after | |
488 | * the last chosen bonding candidate (next_candidate). If no such | |
489 | * router is found, use the first candidate found (the previously | |
490 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 491 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
492 | * router - obviously there are no other candidates. |
493 | */ | |
494 | rcu_read_lock(); | |
495 | last_candidate = orig_node->last_bonding_candidate; | |
496 | if (last_candidate) | |
497 | last_cand_router = rcu_dereference(last_candidate->router); | |
498 | ||
499 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
500 | /* acquire some structures and references ... */ | |
a6ba0d34 | 501 | if (!kref_get_unless_zero(&cand->refcount)) |
f3b3d901 SW |
502 | continue; |
503 | ||
504 | cand_router = rcu_dereference(cand->router); | |
505 | if (!cand_router) | |
506 | goto next; | |
507 | ||
77ae32e8 | 508 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
f3b3d901 SW |
509 | cand_router = NULL; |
510 | goto next; | |
511 | } | |
512 | ||
513 | /* alternative candidate should be good enough to be | |
514 | * considered | |
515 | */ | |
18165f6f SW |
516 | if (!bao->bat_neigh_is_similar_or_better(cand_router, |
517 | cand->if_outgoing, | |
518 | router, recv_if)) | |
f3b3d901 SW |
519 | goto next; |
520 | ||
521 | /* don't use the same router twice */ | |
522 | if (last_cand_router == cand_router) | |
523 | goto next; | |
524 | ||
525 | /* mark the first possible candidate */ | |
526 | if (!first_candidate) { | |
77ae32e8 | 527 | kref_get(&cand_router->refcount); |
a6ba0d34 | 528 | kref_get(&cand->refcount); |
f3b3d901 SW |
529 | first_candidate = cand; |
530 | first_candidate_router = cand_router; | |
531 | } | |
532 | ||
533 | /* check if the loop has already passed the previously selected | |
534 | * candidate ... this function should select the next candidate | |
535 | * AFTER the previously used bonding candidate. | |
536 | */ | |
537 | if (!last_candidate || last_candidate_found) { | |
538 | next_candidate = cand; | |
539 | next_candidate_router = cand_router; | |
540 | break; | |
541 | } | |
542 | ||
543 | if (last_candidate == cand) | |
544 | last_candidate_found = true; | |
545 | next: | |
546 | /* free references */ | |
547 | if (cand_router) { | |
548 | batadv_neigh_node_free_ref(cand_router); | |
549 | cand_router = NULL; | |
550 | } | |
551 | batadv_orig_ifinfo_free_ref(cand); | |
552 | } | |
553 | rcu_read_unlock(); | |
554 | ||
555 | /* last_bonding_candidate is reset below, remove the old reference. */ | |
556 | if (orig_node->last_bonding_candidate) | |
557 | batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); | |
558 | ||
559 | /* After finding candidates, handle the three cases: | |
560 | * 1) there is a next candidate, use that | |
561 | * 2) there is no next candidate, use the first of the list | |
562 | * 3) there is no candidate at all, return the default router | |
563 | */ | |
564 | if (next_candidate) { | |
565 | batadv_neigh_node_free_ref(router); | |
566 | ||
567 | /* remove references to first candidate, we don't need it. */ | |
568 | if (first_candidate) { | |
569 | batadv_neigh_node_free_ref(first_candidate_router); | |
570 | batadv_orig_ifinfo_free_ref(first_candidate); | |
571 | } | |
572 | router = next_candidate_router; | |
573 | orig_node->last_bonding_candidate = next_candidate; | |
574 | } else if (first_candidate) { | |
575 | batadv_neigh_node_free_ref(router); | |
576 | ||
577 | /* refcounting has already been done in the loop above. */ | |
578 | router = first_candidate_router; | |
579 | orig_node->last_bonding_candidate = first_candidate; | |
580 | } else { | |
581 | orig_node->last_bonding_candidate = NULL; | |
582 | } | |
f6c8b711 | 583 | |
c6c8fea2 SE |
584 | return router; |
585 | } | |
586 | ||
63b01037 | 587 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 588 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 589 | { |
56303d34 SE |
590 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
591 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 592 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 593 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 594 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 595 | |
96412690 | 596 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
597 | |
598 | /* TTL exceeded */ | |
a40d9b07 | 599 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
600 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
601 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 602 | goto out; |
c6c8fea2 SE |
603 | } |
604 | ||
605 | /* get routing information */ | |
da641193 | 606 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 607 | |
44524fcd | 608 | if (!orig_node) |
b5a6f69c | 609 | goto out; |
c6c8fea2 | 610 | |
c6c8fea2 | 611 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 612 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 613 | goto out; |
c6c8fea2 | 614 | |
c6c8fea2 | 615 | /* decrement ttl */ |
f097e25d | 616 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 617 | unicast_packet->ttl--; |
c6c8fea2 | 618 | |
a40d9b07 | 619 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
620 | case BATADV_UNICAST_4ADDR: |
621 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
622 | break; | |
623 | case BATADV_UNICAST: | |
624 | hdr_len = sizeof(struct batadv_unicast_packet); | |
625 | break; | |
626 | default: | |
627 | /* other packet types not supported - yet */ | |
628 | hdr_len = -1; | |
629 | break; | |
630 | } | |
631 | ||
632 | if (hdr_len > 0) | |
633 | batadv_skb_set_priority(skb, hdr_len); | |
634 | ||
e91ecfc6 | 635 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 636 | |
e91ecfc6 MH |
637 | /* translate transmit result into receive result */ |
638 | if (res == NET_XMIT_SUCCESS) { | |
639 | /* skb was transmitted and consumed */ | |
95332477 MH |
640 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
641 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
642 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
643 | |
644 | ret = NET_RX_SUCCESS; | |
645 | } else if (res == NET_XMIT_POLICED) { | |
646 | /* skb was buffered and consumed */ | |
647 | ret = NET_RX_SUCCESS; | |
95332477 | 648 | } |
c6c8fea2 | 649 | |
44524fcd | 650 | out: |
44524fcd | 651 | if (orig_node) |
5d967310 | 652 | batadv_orig_node_put(orig_node); |
44524fcd | 653 | return ret; |
c6c8fea2 SE |
654 | } |
655 | ||
7c1fd91d AQ |
656 | /** |
657 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
658 | * @bat_priv: the bat priv with all the soft interface information | |
659 | * @unicast_packet: the unicast header to be updated | |
660 | * @dst_addr: the payload destination | |
c018ad3d | 661 | * @vid: VLAN identifier |
7c1fd91d AQ |
662 | * |
663 | * Search the translation table for dst_addr and update the unicast header with | |
664 | * the new corresponding information (originator address where the destination | |
665 | * client currently is and its known TTVN) | |
666 | * | |
62fe710f | 667 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
668 | */ |
669 | static bool | |
670 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
671 | struct batadv_unicast_packet *unicast_packet, | |
6b5e971a | 672 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
673 | { |
674 | struct batadv_orig_node *orig_node = NULL; | |
675 | struct batadv_hard_iface *primary_if = NULL; | |
676 | bool ret = false; | |
6b5e971a | 677 | u8 *orig_addr, orig_ttvn; |
7c1fd91d | 678 | |
c018ad3d | 679 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
680 | primary_if = batadv_primary_if_get_selected(bat_priv); |
681 | if (!primary_if) | |
682 | goto out; | |
683 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 684 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 685 | } else { |
c018ad3d AQ |
686 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
687 | vid); | |
7c1fd91d AQ |
688 | if (!orig_node) |
689 | goto out; | |
690 | ||
691 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
692 | goto out; | |
693 | ||
694 | orig_addr = orig_node->orig; | |
6b5e971a | 695 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
696 | } |
697 | ||
698 | /* update the packet header */ | |
8fdd0153 | 699 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d AQ |
700 | unicast_packet->ttvn = orig_ttvn; |
701 | ||
702 | ret = true; | |
703 | out: | |
704 | if (primary_if) | |
82047ad7 | 705 | batadv_hardif_put(primary_if); |
7c1fd91d | 706 | if (orig_node) |
5d967310 | 707 | batadv_orig_node_put(orig_node); |
7c1fd91d AQ |
708 | |
709 | return ret; | |
710 | } | |
711 | ||
56303d34 | 712 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 713 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
714 | struct batadv_unicast_packet *unicast_packet; |
715 | struct batadv_hard_iface *primary_if; | |
56303d34 | 716 | struct batadv_orig_node *orig_node; |
6b5e971a | 717 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 718 | struct ethhdr *ethhdr; |
c018ad3d | 719 | unsigned short vid; |
3e34819e | 720 | int is_old_ttvn; |
a73105b8 | 721 | |
b8fcfa42 | 722 | /* check if there is enough data before accessing it */ |
f1791425 | 723 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
b8fcfa42 AQ |
724 | return 0; |
725 | ||
726 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
727 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
728 | return 0; |
729 | ||
96412690 | 730 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 731 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 732 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 733 | |
7c1fd91d AQ |
734 | /* check if the destination client was served by this node and it is now |
735 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
736 | * message and that it knows the new destination in the mesh to re-route | |
737 | * the packet to | |
738 | */ | |
c018ad3d | 739 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 740 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 741 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
742 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
743 | bat_priv, | |
744 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
745 | unicast_packet->dest, | |
746 | ethhdr->h_dest); | |
7c1fd91d AQ |
747 | /* at this point the mesh destination should have been |
748 | * substituted with the originator address found in the global | |
749 | * table. If not, let the packet go untouched anyway because | |
750 | * there is nothing the node can do | |
751 | */ | |
752 | return 1; | |
753 | } | |
754 | ||
755 | /* retrieve the TTVN known by this node for the packet destination. This | |
756 | * value is used later to check if the node which sent (or re-routed | |
757 | * last time) the packet had an updated information or not | |
758 | */ | |
6b5e971a | 759 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 760 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
761 | orig_node = batadv_orig_hash_find(bat_priv, |
762 | unicast_packet->dest); | |
7c1fd91d AQ |
763 | /* if it is not possible to find the orig_node representing the |
764 | * destination, the packet can immediately be dropped as it will | |
765 | * not be possible to deliver it | |
766 | */ | |
a73105b8 AQ |
767 | if (!orig_node) |
768 | return 0; | |
769 | ||
6b5e971a | 770 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
5d967310 | 771 | batadv_orig_node_put(orig_node); |
a73105b8 AQ |
772 | } |
773 | ||
7c1fd91d AQ |
774 | /* check if the TTVN contained in the packet is fresher than what the |
775 | * node knows | |
776 | */ | |
3e34819e | 777 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
778 | if (!is_old_ttvn) |
779 | return 1; | |
a73105b8 | 780 | |
7c1fd91d AQ |
781 | old_ttvn = unicast_packet->ttvn; |
782 | /* the packet was forged based on outdated network information. Its | |
783 | * destination can possibly be updated and forwarded towards the new | |
784 | * target host | |
785 | */ | |
786 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 787 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
788 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
789 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
790 | unicast_packet->dest, ethhdr->h_dest, | |
791 | old_ttvn, curr_ttvn); | |
7c1fd91d AQ |
792 | return 1; |
793 | } | |
3275e7cc | 794 | |
7c1fd91d AQ |
795 | /* the packet has not been re-routed: either the destination is |
796 | * currently served by this node or there is no destination at all and | |
797 | * it is possible to drop the packet | |
798 | */ | |
c018ad3d | 799 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 800 | return 0; |
3275e7cc | 801 | |
7c1fd91d AQ |
802 | /* update the header in order to let the packet be delivered to this |
803 | * node's soft interface | |
804 | */ | |
805 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
806 | if (!primary_if) | |
807 | return 0; | |
a73105b8 | 808 | |
8fdd0153 | 809 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91d | 810 | |
82047ad7 | 811 | batadv_hardif_put(primary_if); |
7c1fd91d AQ |
812 | |
813 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 814 | |
a73105b8 AQ |
815 | return 1; |
816 | } | |
817 | ||
a1f1ac5c SW |
818 | /** |
819 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
820 | * are in the unicast number space but not yet known to the implementation | |
821 | * @skb: unicast tvlv packet to process | |
822 | * @recv_if: pointer to interface this packet was received on | |
823 | * | |
62fe710f | 824 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
825 | * otherwise. |
826 | */ | |
827 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
828 | struct batadv_hard_iface *recv_if) | |
829 | { | |
830 | struct batadv_unicast_packet *unicast_packet; | |
831 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
832 | int check, hdr_size = sizeof(*unicast_packet); | |
833 | ||
834 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
835 | if (check < 0) | |
836 | return NET_RX_DROP; | |
837 | ||
838 | /* we don't know about this type, drop it. */ | |
839 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
840 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
841 | return NET_RX_DROP; | |
842 | ||
843 | return batadv_route_unicast_packet(skb, recv_if); | |
844 | } | |
845 | ||
56303d34 SE |
846 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
847 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 848 | { |
56303d34 | 849 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 850 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 851 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
6b5e971a | 852 | u8 *orig_addr; |
9affec6b | 853 | struct batadv_orig_node *orig_node = NULL; |
612d2b4f | 854 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 855 | enum batadv_subtype subtype; |
c384ea3e | 856 | bool is4addr; |
c6c8fea2 | 857 | |
7cdcf6dd | 858 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 859 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 860 | |
a40d9b07 | 861 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 862 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 863 | if (is4addr) |
4046b24a | 864 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 865 | |
612d2b4f | 866 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 867 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
868 | |
869 | /* Even though the packet is not for us, we might save it to use for | |
870 | * decoding a later received coded packet | |
871 | */ | |
872 | if (check == -EREMOTE) | |
873 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
874 | ||
875 | if (check < 0) | |
c6c8fea2 | 876 | return NET_RX_DROP; |
dd981ab0 | 877 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
878 | return NET_RX_DROP; |
879 | ||
c6c8fea2 | 880 | /* packet for me */ |
fe8a93b9 | 881 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 882 | if (is4addr) { |
437bb0e6 SW |
883 | subtype = unicast_4addr_packet->subtype; |
884 | batadv_dat_inc_counter(bat_priv, subtype); | |
885 | ||
886 | /* Only payload data should be considered for speedy | |
887 | * join. For example, DAT also uses unicast 4addr | |
888 | * types, but those packets should not be considered | |
889 | * for speedy join, since the clients do not actually | |
890 | * reside at the sending originator. | |
891 | */ | |
892 | if (subtype == BATADV_P_DATA) { | |
893 | orig_addr = unicast_4addr_packet->src; | |
894 | orig_node = batadv_orig_hash_find(bat_priv, | |
895 | orig_addr); | |
896 | } | |
9affec6b | 897 | } |
4046b24a | 898 | |
c384ea3e AQ |
899 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
900 | hdr_size)) | |
901 | goto rx_success; | |
902 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
903 | hdr_size)) | |
904 | goto rx_success; | |
905 | ||
37135173 | 906 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 907 | orig_node); |
37135173 | 908 | |
c384ea3e | 909 | rx_success: |
9affec6b | 910 | if (orig_node) |
5d967310 | 911 | batadv_orig_node_put(orig_node); |
9affec6b | 912 | |
c6c8fea2 SE |
913 | return NET_RX_SUCCESS; |
914 | } | |
915 | ||
63b01037 | 916 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
917 | } |
918 | ||
ef261577 ML |
919 | /** |
920 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
921 | * @skb: unicast tvlv packet to process | |
922 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 923 | * |
62fe710f | 924 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
925 | * otherwise. |
926 | */ | |
927 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
928 | struct batadv_hard_iface *recv_if) | |
929 | { | |
930 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
931 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
932 | unsigned char *tvlv_buff; | |
6b5e971a | 933 | u16 tvlv_buff_len; |
ef261577 ML |
934 | int hdr_size = sizeof(*unicast_tvlv_packet); |
935 | int ret = NET_RX_DROP; | |
936 | ||
937 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
938 | return NET_RX_DROP; | |
939 | ||
940 | /* the header is likely to be modified while forwarding */ | |
941 | if (skb_cow(skb, hdr_size) < 0) | |
942 | return NET_RX_DROP; | |
943 | ||
944 | /* packet needs to be linearized to access the tvlv content */ | |
945 | if (skb_linearize(skb) < 0) | |
946 | return NET_RX_DROP; | |
947 | ||
948 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
949 | ||
950 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
951 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
952 | ||
953 | if (tvlv_buff_len > skb->len - hdr_size) | |
954 | return NET_RX_DROP; | |
955 | ||
956 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
957 | unicast_tvlv_packet->src, | |
958 | unicast_tvlv_packet->dst, | |
959 | tvlv_buff, tvlv_buff_len); | |
960 | ||
961 | if (ret != NET_RX_SUCCESS) | |
962 | ret = batadv_route_unicast_packet(skb, recv_if); | |
05c3c8a6 AQ |
963 | else |
964 | consume_skb(skb); | |
ef261577 ML |
965 | |
966 | return ret; | |
967 | } | |
c6c8fea2 | 968 | |
610bfc6b MH |
969 | /** |
970 | * batadv_recv_frag_packet - process received fragment | |
971 | * @skb: the received fragment | |
972 | * @recv_if: interface that the skb is received on | |
973 | * | |
974 | * This function does one of the three following things: 1) Forward fragment, if | |
975 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
976 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
977 | * | |
62fe710f | 978 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
979 | */ |
980 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
981 | struct batadv_hard_iface *recv_if) | |
982 | { | |
983 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
984 | struct batadv_orig_node *orig_node_src = NULL; | |
985 | struct batadv_frag_packet *frag_packet; | |
986 | int ret = NET_RX_DROP; | |
987 | ||
988 | if (batadv_check_unicast_packet(bat_priv, skb, | |
989 | sizeof(*frag_packet)) < 0) | |
990 | goto out; | |
991 | ||
992 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
993 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
994 | if (!orig_node_src) | |
995 | goto out; | |
996 | ||
997 | /* Route the fragment if it is not for us and too big to be merged. */ | |
998 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
999 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1000 | ret = NET_RX_SUCCESS; | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1005 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1006 | ||
1007 | /* Add fragment to buffer and merge if possible. */ | |
1008 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1009 | goto out; | |
1010 | ||
1011 | /* Deliver merged packet to the appropriate handler, if it was | |
1012 | * merged | |
1013 | */ | |
1014 | if (skb) | |
1015 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1016 | &recv_if->batman_adv_ptype, NULL); | |
1017 | ||
1018 | ret = NET_RX_SUCCESS; | |
1019 | ||
1020 | out: | |
1021 | if (orig_node_src) | |
5d967310 | 1022 | batadv_orig_node_put(orig_node_src); |
610bfc6b MH |
1023 | |
1024 | return ret; | |
1025 | } | |
1026 | ||
56303d34 SE |
1027 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1028 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1029 | { |
56303d34 SE |
1030 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1031 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1032 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1033 | struct ethhdr *ethhdr; |
704509b8 | 1034 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1035 | int ret = NET_RX_DROP; |
6b5e971a SE |
1036 | s32 seq_diff; |
1037 | u32 seqno; | |
c6c8fea2 SE |
1038 | |
1039 | /* drop packet if it has not necessary minimum size */ | |
1040 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1041 | goto out; |
c6c8fea2 | 1042 | |
7ed4be95 | 1043 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1044 | |
1045 | /* packet with broadcast indication but unicast recipient */ | |
1046 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1047 | goto out; |
c6c8fea2 SE |
1048 | |
1049 | /* packet with broadcast sender address */ | |
1050 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1051 | goto out; |
c6c8fea2 SE |
1052 | |
1053 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1054 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1055 | goto out; |
c6c8fea2 | 1056 | |
96412690 | 1057 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1058 | |
1059 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1060 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1061 | goto out; |
c6c8fea2 | 1062 | |
a40d9b07 | 1063 | if (bcast_packet->ttl < 2) |
f3e0008f | 1064 | goto out; |
c6c8fea2 | 1065 | |
da641193 | 1066 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1067 | |
1068 | if (!orig_node) | |
b5a6f69c | 1069 | goto out; |
c6c8fea2 | 1070 | |
f3e0008f | 1071 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1072 | |
3fba7325 | 1073 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1074 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1075 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1076 | seqno)) |
f3e0008f | 1077 | goto spin_unlock; |
c6c8fea2 | 1078 | |
3fba7325 | 1079 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1080 | |
1081 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 | 1082 | if (batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1083 | BATADV_BCAST_MAX_AGE, |
1084 | &orig_node->bcast_seqno_reset, NULL)) | |
f3e0008f | 1085 | goto spin_unlock; |
c6c8fea2 SE |
1086 | |
1087 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1088 | * if required. |
1089 | */ | |
0f5f9322 | 1090 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1091 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1092 | |
f3e0008f | 1093 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1094 | |
fe2da6ff | 1095 | /* check whether this has been sent by another originator before */ |
004e86fc | 1096 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1097 | goto out; |
1098 | ||
c54f38c9 SW |
1099 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1100 | ||
c6c8fea2 | 1101 | /* rebroadcast packet */ |
9455e34c | 1102 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1103 | |
23721387 SW |
1104 | /* don't hand the broadcast up if it is from an originator |
1105 | * from the same backbone. | |
1106 | */ | |
08adf151 | 1107 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1108 | goto out; |
1109 | ||
c384ea3e AQ |
1110 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1111 | goto rx_success; | |
1112 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1113 | goto rx_success; | |
1114 | ||
c6c8fea2 | 1115 | /* broadcast for me */ |
37135173 AQ |
1116 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1117 | orig_node); | |
c384ea3e AQ |
1118 | |
1119 | rx_success: | |
f3e0008f ML |
1120 | ret = NET_RX_SUCCESS; |
1121 | goto out; | |
c6c8fea2 | 1122 | |
f3e0008f ML |
1123 | spin_unlock: |
1124 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1125 | out: |
1126 | if (orig_node) | |
5d967310 | 1127 | batadv_orig_node_put(orig_node); |
f3e0008f | 1128 | return ret; |
c6c8fea2 | 1129 | } |