Commit | Line | Data |
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e19f9759 | 1 | /* Copyright (C) 2007-2014 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 | ||
18 | #include "main.h" | |
19 | #include "routing.h" | |
20 | #include "send.h" | |
c6c8fea2 SE |
21 | #include "soft-interface.h" |
22 | #include "hard-interface.h" | |
23 | #include "icmp_socket.h" | |
24 | #include "translation-table.h" | |
25 | #include "originator.h" | |
23721387 | 26 | #include "bridge_loop_avoidance.h" |
c384ea3e | 27 | #include "distributed-arp-table.h" |
95332477 | 28 | #include "network-coding.h" |
610bfc6b | 29 | #include "fragmentation.h" |
c6c8fea2 | 30 | |
c018ad3d AQ |
31 | #include <linux/if_vlan.h> |
32 | ||
63b01037 | 33 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 34 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 35 | |
7351a482 SW |
36 | /** |
37 | * _batadv_update_route - set the router for this originator | |
38 | * @bat_priv: the bat priv with all the soft interface information | |
39 | * @orig_node: orig node which is to be configured | |
40 | * @recv_if: the receive interface for which this route is set | |
41 | * @neigh_node: neighbor which should be the next router | |
42 | * | |
43 | * This function does not perform any error checks | |
44 | */ | |
56303d34 SE |
45 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
46 | struct batadv_orig_node *orig_node, | |
7351a482 | 47 | struct batadv_hard_iface *recv_if, |
56303d34 | 48 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 49 | { |
7351a482 | 50 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 51 | struct batadv_neigh_node *curr_router; |
e1a5382f | 52 | |
7351a482 SW |
53 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
54 | if (!orig_ifinfo) | |
55 | return; | |
56 | ||
57 | rcu_read_lock(); | |
58 | curr_router = rcu_dereference(orig_ifinfo->router); | |
59 | if (curr_router && !atomic_inc_not_zero(&curr_router->refcount)) | |
60 | curr_router = NULL; | |
61 | rcu_read_unlock(); | |
a8e7f4bc | 62 | |
c6c8fea2 | 63 | /* route deleted */ |
e1a5382f | 64 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
65 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
66 | "Deleting route towards: %pM\n", orig_node->orig); | |
95fb130d | 67 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 68 | "Deleted route towards originator"); |
c6c8fea2 | 69 | |
e1a5382f LL |
70 | /* route added */ |
71 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 72 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
73 | "Adding route towards: %pM (via %pM)\n", |
74 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 75 | /* route changed */ |
bb899b89 | 76 | } else if (neigh_node && curr_router) { |
39c75a51 | 77 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
78 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
79 | orig_node->orig, neigh_node->addr, | |
80 | curr_router->addr); | |
c6c8fea2 SE |
81 | } |
82 | ||
e1a5382f | 83 | if (curr_router) |
7d211efc | 84 | batadv_neigh_node_free_ref(curr_router); |
e1a5382f LL |
85 | |
86 | /* increase refcount of new best neighbor */ | |
44524fcd ML |
87 | if (neigh_node && !atomic_inc_not_zero(&neigh_node->refcount)) |
88 | neigh_node = NULL; | |
e1a5382f LL |
89 | |
90 | spin_lock_bh(&orig_node->neigh_list_lock); | |
7351a482 | 91 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
e1a5382f | 92 | spin_unlock_bh(&orig_node->neigh_list_lock); |
7351a482 | 93 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
e1a5382f LL |
94 | |
95 | /* decrease refcount of previous best neighbor */ | |
96 | if (curr_router) | |
7d211efc | 97 | batadv_neigh_node_free_ref(curr_router); |
c6c8fea2 SE |
98 | } |
99 | ||
7351a482 SW |
100 | /** |
101 | * batadv_update_route - set the router for this originator | |
102 | * @bat_priv: the bat priv with all the soft interface information | |
103 | * @orig_node: orig node which is to be configured | |
104 | * @recv_if: the receive interface for which this route is set | |
105 | * @neigh_node: neighbor which should be the next router | |
106 | */ | |
56303d34 SE |
107 | void batadv_update_route(struct batadv_priv *bat_priv, |
108 | struct batadv_orig_node *orig_node, | |
7351a482 | 109 | struct batadv_hard_iface *recv_if, |
56303d34 | 110 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 111 | { |
56303d34 | 112 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
113 | |
114 | if (!orig_node) | |
e1a5382f LL |
115 | goto out; |
116 | ||
7351a482 | 117 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 118 | |
e1a5382f | 119 | if (router != neigh_node) |
7351a482 | 120 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
121 | |
122 | out: | |
123 | if (router) | |
7d211efc | 124 | batadv_neigh_node_free_ref(router); |
c6c8fea2 SE |
125 | } |
126 | ||
c6c8fea2 SE |
127 | /* checks whether the host restarted and is in the protection time. |
128 | * returns: | |
129 | * 0 if the packet is to be accepted | |
130 | * 1 if the packet is to be ignored. | |
131 | */ | |
56303d34 | 132 | int batadv_window_protected(struct batadv_priv *bat_priv, int32_t seq_num_diff, |
30d3c511 | 133 | unsigned long *last_reset) |
c6c8fea2 | 134 | { |
42d0b044 SE |
135 | if (seq_num_diff <= -BATADV_TQ_LOCAL_WINDOW_SIZE || |
136 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { | |
137 | if (!batadv_has_timed_out(*last_reset, | |
138 | BATADV_RESET_PROTECTION_MS)) | |
c6c8fea2 | 139 | return 1; |
8c7bf248 ML |
140 | |
141 | *last_reset = jiffies; | |
39c75a51 | 142 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 143 | "old packet received, start protection\n"); |
c6c8fea2 | 144 | } |
8c7bf248 | 145 | |
c6c8fea2 SE |
146 | return 0; |
147 | } | |
148 | ||
30d3c511 | 149 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 150 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 151 | int header_len) |
c6c8fea2 | 152 | { |
c6c8fea2 SE |
153 | struct ethhdr *ethhdr; |
154 | ||
155 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
156 | if (unlikely(!pskb_may_pull(skb, header_len))) |
157 | return false; | |
c6c8fea2 | 158 | |
7ed4be95 | 159 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
160 | |
161 | /* packet with broadcast indication but unicast recipient */ | |
162 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 163 | return false; |
c6c8fea2 SE |
164 | |
165 | /* packet with broadcast sender address */ | |
166 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 167 | return false; |
c6c8fea2 SE |
168 | |
169 | /* create a copy of the skb, if needed, to modify it. */ | |
170 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 171 | return false; |
c6c8fea2 SE |
172 | |
173 | /* keep skb linear */ | |
174 | if (skb_linearize(skb) < 0) | |
c3e29312 | 175 | return false; |
c6c8fea2 | 176 | |
c3e29312 | 177 | return true; |
c6c8fea2 SE |
178 | } |
179 | ||
da6b8c20 SW |
180 | /** |
181 | * batadv_recv_my_icmp_packet - receive an icmp packet locally | |
182 | * @bat_priv: the bat priv with all the soft interface information | |
183 | * @skb: icmp packet to process | |
184 | * | |
185 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
186 | * otherwise. | |
187 | */ | |
56303d34 | 188 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 189 | struct sk_buff *skb) |
c6c8fea2 | 190 | { |
56303d34 SE |
191 | struct batadv_hard_iface *primary_if = NULL; |
192 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
193 | struct batadv_icmp_header *icmph; |
194 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 195 | |
da6b8c20 | 196 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 197 | |
da6b8c20 SW |
198 | switch (icmph->msg_type) { |
199 | case BATADV_ECHO_REPLY: | |
200 | case BATADV_DESTINATION_UNREACHABLE: | |
201 | case BATADV_TTL_EXCEEDED: | |
202 | /* receive the packet */ | |
203 | if (skb_linearize(skb) < 0) | |
204 | break; | |
c6c8fea2 | 205 | |
da6b8c20 SW |
206 | batadv_socket_receive_packet(icmph, skb->len); |
207 | break; | |
208 | case BATADV_ECHO_REQUEST: | |
209 | /* answer echo request (ping) */ | |
210 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
211 | if (!primary_if) | |
212 | goto out; | |
213 | ||
214 | /* get routing information */ | |
215 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
216 | if (!orig_node) | |
217 | goto out; | |
218 | ||
219 | /* create a copy of the skb, if needed, to modify it. */ | |
220 | if (skb_cow(skb, ETH_HLEN) < 0) | |
221 | goto out; | |
222 | ||
223 | icmph = (struct batadv_icmp_header *)skb->data; | |
224 | ||
8fdd0153 AQ |
225 | ether_addr_copy(icmph->dst, icmph->orig); |
226 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 227 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 228 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
229 | |
230 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
231 | if (res != NET_XMIT_DROP) | |
232 | ret = NET_RX_SUCCESS; | |
233 | ||
234 | break; | |
235 | default: | |
236 | /* drop unknown type */ | |
44524fcd | 237 | goto out; |
da6b8c20 | 238 | } |
44524fcd | 239 | out: |
32ae9b22 | 240 | if (primary_if) |
e5d89254 | 241 | batadv_hardif_free_ref(primary_if); |
44524fcd | 242 | if (orig_node) |
7d211efc | 243 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
244 | return ret; |
245 | } | |
246 | ||
56303d34 | 247 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 248 | struct sk_buff *skb) |
c6c8fea2 | 249 | { |
56303d34 SE |
250 | struct batadv_hard_iface *primary_if = NULL; |
251 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 252 | struct batadv_icmp_packet *icmp_packet; |
44524fcd | 253 | int ret = NET_RX_DROP; |
c6c8fea2 | 254 | |
96412690 | 255 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
256 | |
257 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 258 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 259 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 260 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 261 | goto out; |
c6c8fea2 SE |
262 | } |
263 | ||
e5d89254 | 264 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 265 | if (!primary_if) |
44524fcd | 266 | goto out; |
c6c8fea2 SE |
267 | |
268 | /* get routing information */ | |
27a417e6 | 269 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 270 | if (!orig_node) |
e1a5382f | 271 | goto out; |
c6c8fea2 | 272 | |
44524fcd | 273 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 274 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 275 | goto out; |
c6c8fea2 | 276 | |
96412690 | 277 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 278 | |
8fdd0153 AQ |
279 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
280 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
281 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
282 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 283 | |
e91ecfc6 | 284 | if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) |
bb351ba0 | 285 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 286 | |
44524fcd | 287 | out: |
32ae9b22 | 288 | if (primary_if) |
e5d89254 | 289 | batadv_hardif_free_ref(primary_if); |
44524fcd | 290 | if (orig_node) |
7d211efc | 291 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
292 | return ret; |
293 | } | |
294 | ||
295 | ||
56303d34 SE |
296 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
297 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 298 | { |
56303d34 | 299 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
300 | struct batadv_icmp_header *icmph; |
301 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 302 | struct ethhdr *ethhdr; |
56303d34 | 303 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 304 | int hdr_size = sizeof(struct batadv_icmp_header); |
44524fcd | 305 | int ret = NET_RX_DROP; |
c6c8fea2 | 306 | |
c6c8fea2 SE |
307 | /* drop packet if it has not necessary minimum size */ |
308 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 309 | goto out; |
c6c8fea2 | 310 | |
7ed4be95 | 311 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
312 | |
313 | /* packet with unicast indication but broadcast recipient */ | |
314 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 315 | goto out; |
c6c8fea2 SE |
316 | |
317 | /* packet with broadcast sender address */ | |
318 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 319 | goto out; |
c6c8fea2 SE |
320 | |
321 | /* not for me */ | |
fe8a93b9 | 322 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 323 | goto out; |
c6c8fea2 | 324 | |
da6b8c20 | 325 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
326 | |
327 | /* add record route information if not full */ | |
da6b8c20 SW |
328 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
329 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
330 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { | |
331 | if (skb_linearize(skb) < 0) | |
332 | goto out; | |
333 | ||
334 | /* create a copy of the skb, if needed, to modify it. */ | |
335 | if (skb_cow(skb, ETH_HLEN) < 0) | |
336 | goto out; | |
337 | ||
338 | icmph = (struct batadv_icmp_header *)skb->data; | |
339 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
340 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
341 | goto out; | |
342 | ||
8fdd0153 AQ |
343 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
344 | ethhdr->h_dest); | |
da6b8c20 | 345 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
346 | } |
347 | ||
348 | /* packet for me */ | |
da6b8c20 SW |
349 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
350 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
351 | |
352 | /* TTL exceeded */ | |
a40d9b07 | 353 | if (icmph->ttl < 2) |
63b01037 | 354 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 355 | |
c6c8fea2 | 356 | /* get routing information */ |
da6b8c20 | 357 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 358 | if (!orig_node) |
e1a5382f | 359 | goto out; |
c6c8fea2 | 360 | |
44524fcd | 361 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 362 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 363 | goto out; |
c6c8fea2 | 364 | |
da6b8c20 | 365 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 366 | |
44524fcd | 367 | /* decrement ttl */ |
a40d9b07 | 368 | icmph->ttl--; |
44524fcd ML |
369 | |
370 | /* route it */ | |
e91ecfc6 | 371 | if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP) |
bb351ba0 | 372 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 373 | |
44524fcd | 374 | out: |
44524fcd | 375 | if (orig_node) |
7d211efc | 376 | batadv_orig_node_free_ref(orig_node); |
c6c8fea2 SE |
377 | return ret; |
378 | } | |
379 | ||
f86ce0ad MH |
380 | /** |
381 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 382 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
383 | * @skb: packet to check |
384 | * @hdr_size: size of header to pull | |
385 | * | |
386 | * Check for short header and bad addresses in given packet. Returns negative | |
387 | * value when check fails and 0 otherwise. The negative value depends on the | |
388 | * reason: -ENODATA for bad header, -EBADR for broadcast destination or source, | |
389 | * and -EREMOTE for non-local (other host) destination. | |
390 | */ | |
fe8a93b9 AQ |
391 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
392 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
393 | { |
394 | struct ethhdr *ethhdr; | |
395 | ||
396 | /* drop packet if it has not necessary minimum size */ | |
397 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 398 | return -ENODATA; |
ff51fd70 | 399 | |
7ed4be95 | 400 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
401 | |
402 | /* packet with unicast indication but broadcast recipient */ | |
403 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 404 | return -EBADR; |
ff51fd70 MH |
405 | |
406 | /* packet with broadcast sender address */ | |
407 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 408 | return -EBADR; |
ff51fd70 MH |
409 | |
410 | /* not for me */ | |
fe8a93b9 | 411 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 412 | return -EREMOTE; |
ff51fd70 MH |
413 | |
414 | return 0; | |
415 | } | |
416 | ||
f6c8b711 SW |
417 | /** |
418 | * batadv_find_router - find a suitable router for this originator | |
419 | * @bat_priv: the bat priv with all the soft interface information | |
420 | * @orig_node: the destination node | |
421 | * @recv_if: pointer to interface this packet was received on | |
422 | * | |
423 | * Returns the router which should be used for this orig_node on | |
424 | * this interface, or NULL if not available. | |
9cfc7bd6 | 425 | */ |
56303d34 SE |
426 | struct batadv_neigh_node * |
427 | batadv_find_router(struct batadv_priv *bat_priv, | |
428 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 429 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 430 | { |
f3b3d901 SW |
431 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
432 | struct batadv_neigh_node *first_candidate_router = NULL; | |
433 | struct batadv_neigh_node *next_candidate_router = NULL; | |
434 | struct batadv_neigh_node *router, *cand_router = NULL; | |
435 | struct batadv_neigh_node *last_cand_router = NULL; | |
436 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
437 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
438 | struct batadv_orig_ifinfo *last_candidate; | |
439 | bool last_candidate_found = false; | |
c6c8fea2 SE |
440 | |
441 | if (!orig_node) | |
442 | return NULL; | |
443 | ||
7351a482 | 444 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 445 | |
f3b3d901 SW |
446 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
447 | * and if activated. | |
448 | */ | |
449 | if (recv_if == BATADV_IF_DEFAULT || !atomic_read(&bat_priv->bonding) || | |
450 | !router) | |
451 | return router; | |
452 | ||
453 | /* bonding: loop through the list of possible routers found | |
454 | * for the various outgoing interfaces and find a candidate after | |
455 | * the last chosen bonding candidate (next_candidate). If no such | |
456 | * router is found, use the first candidate found (the previously | |
457 | * chosen bonding candidate might have been the last one in the list). | |
458 | * If this can't be found either, return the previously choosen | |
459 | * router - obviously there are no other candidates. | |
460 | */ | |
461 | rcu_read_lock(); | |
462 | last_candidate = orig_node->last_bonding_candidate; | |
463 | if (last_candidate) | |
464 | last_cand_router = rcu_dereference(last_candidate->router); | |
465 | ||
466 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
467 | /* acquire some structures and references ... */ | |
468 | if (!atomic_inc_not_zero(&cand->refcount)) | |
469 | continue; | |
470 | ||
471 | cand_router = rcu_dereference(cand->router); | |
472 | if (!cand_router) | |
473 | goto next; | |
474 | ||
475 | if (!atomic_inc_not_zero(&cand_router->refcount)) { | |
476 | cand_router = NULL; | |
477 | goto next; | |
478 | } | |
479 | ||
480 | /* alternative candidate should be good enough to be | |
481 | * considered | |
482 | */ | |
483 | if (!bao->bat_neigh_is_equiv_or_better(cand_router, | |
484 | cand->if_outgoing, | |
485 | router, recv_if)) | |
486 | goto next; | |
487 | ||
488 | /* don't use the same router twice */ | |
489 | if (last_cand_router == cand_router) | |
490 | goto next; | |
491 | ||
492 | /* mark the first possible candidate */ | |
493 | if (!first_candidate) { | |
494 | atomic_inc(&cand_router->refcount); | |
495 | atomic_inc(&cand->refcount); | |
496 | first_candidate = cand; | |
497 | first_candidate_router = cand_router; | |
498 | } | |
499 | ||
500 | /* check if the loop has already passed the previously selected | |
501 | * candidate ... this function should select the next candidate | |
502 | * AFTER the previously used bonding candidate. | |
503 | */ | |
504 | if (!last_candidate || last_candidate_found) { | |
505 | next_candidate = cand; | |
506 | next_candidate_router = cand_router; | |
507 | break; | |
508 | } | |
509 | ||
510 | if (last_candidate == cand) | |
511 | last_candidate_found = true; | |
512 | next: | |
513 | /* free references */ | |
514 | if (cand_router) { | |
515 | batadv_neigh_node_free_ref(cand_router); | |
516 | cand_router = NULL; | |
517 | } | |
518 | batadv_orig_ifinfo_free_ref(cand); | |
519 | } | |
520 | rcu_read_unlock(); | |
521 | ||
522 | /* last_bonding_candidate is reset below, remove the old reference. */ | |
523 | if (orig_node->last_bonding_candidate) | |
524 | batadv_orig_ifinfo_free_ref(orig_node->last_bonding_candidate); | |
525 | ||
526 | /* After finding candidates, handle the three cases: | |
527 | * 1) there is a next candidate, use that | |
528 | * 2) there is no next candidate, use the first of the list | |
529 | * 3) there is no candidate at all, return the default router | |
530 | */ | |
531 | if (next_candidate) { | |
532 | batadv_neigh_node_free_ref(router); | |
533 | ||
534 | /* remove references to first candidate, we don't need it. */ | |
535 | if (first_candidate) { | |
536 | batadv_neigh_node_free_ref(first_candidate_router); | |
537 | batadv_orig_ifinfo_free_ref(first_candidate); | |
538 | } | |
539 | router = next_candidate_router; | |
540 | orig_node->last_bonding_candidate = next_candidate; | |
541 | } else if (first_candidate) { | |
542 | batadv_neigh_node_free_ref(router); | |
543 | ||
544 | /* refcounting has already been done in the loop above. */ | |
545 | router = first_candidate_router; | |
546 | orig_node->last_bonding_candidate = first_candidate; | |
547 | } else { | |
548 | orig_node->last_bonding_candidate = NULL; | |
549 | } | |
f6c8b711 | 550 | |
c6c8fea2 SE |
551 | return router; |
552 | } | |
553 | ||
63b01037 | 554 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 555 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 556 | { |
56303d34 SE |
557 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
558 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 559 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 560 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 561 | int res, hdr_len, ret = NET_RX_DROP; |
c6c8fea2 | 562 | |
96412690 | 563 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
564 | |
565 | /* TTL exceeded */ | |
a40d9b07 | 566 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
567 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
568 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 569 | goto out; |
c6c8fea2 SE |
570 | } |
571 | ||
572 | /* get routing information */ | |
da641193 | 573 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 574 | |
44524fcd | 575 | if (!orig_node) |
b5a6f69c | 576 | goto out; |
c6c8fea2 | 577 | |
c6c8fea2 | 578 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 579 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 580 | goto out; |
c6c8fea2 | 581 | |
c6c8fea2 | 582 | /* decrement ttl */ |
f097e25d | 583 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 584 | unicast_packet->ttl--; |
c6c8fea2 | 585 | |
a40d9b07 | 586 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
587 | case BATADV_UNICAST_4ADDR: |
588 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
589 | break; | |
590 | case BATADV_UNICAST: | |
591 | hdr_len = sizeof(struct batadv_unicast_packet); | |
592 | break; | |
593 | default: | |
594 | /* other packet types not supported - yet */ | |
595 | hdr_len = -1; | |
596 | break; | |
597 | } | |
598 | ||
599 | if (hdr_len > 0) | |
600 | batadv_skb_set_priority(skb, hdr_len); | |
601 | ||
e91ecfc6 | 602 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 603 | |
e91ecfc6 MH |
604 | /* translate transmit result into receive result */ |
605 | if (res == NET_XMIT_SUCCESS) { | |
606 | /* skb was transmitted and consumed */ | |
95332477 MH |
607 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
608 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
609 | skb->len + ETH_HLEN); | |
e91ecfc6 MH |
610 | |
611 | ret = NET_RX_SUCCESS; | |
612 | } else if (res == NET_XMIT_POLICED) { | |
613 | /* skb was buffered and consumed */ | |
614 | ret = NET_RX_SUCCESS; | |
95332477 | 615 | } |
c6c8fea2 | 616 | |
44524fcd | 617 | out: |
44524fcd | 618 | if (orig_node) |
7d211efc | 619 | batadv_orig_node_free_ref(orig_node); |
44524fcd | 620 | return ret; |
c6c8fea2 SE |
621 | } |
622 | ||
7c1fd91d AQ |
623 | /** |
624 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
625 | * @bat_priv: the bat priv with all the soft interface information | |
626 | * @unicast_packet: the unicast header to be updated | |
627 | * @dst_addr: the payload destination | |
c018ad3d | 628 | * @vid: VLAN identifier |
7c1fd91d AQ |
629 | * |
630 | * Search the translation table for dst_addr and update the unicast header with | |
631 | * the new corresponding information (originator address where the destination | |
632 | * client currently is and its known TTVN) | |
633 | * | |
634 | * Returns true if the packet header has been updated, false otherwise | |
635 | */ | |
636 | static bool | |
637 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
638 | struct batadv_unicast_packet *unicast_packet, | |
c018ad3d | 639 | uint8_t *dst_addr, unsigned short vid) |
7c1fd91d AQ |
640 | { |
641 | struct batadv_orig_node *orig_node = NULL; | |
642 | struct batadv_hard_iface *primary_if = NULL; | |
643 | bool ret = false; | |
644 | uint8_t *orig_addr, orig_ttvn; | |
645 | ||
c018ad3d | 646 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
647 | primary_if = batadv_primary_if_get_selected(bat_priv); |
648 | if (!primary_if) | |
649 | goto out; | |
650 | orig_addr = primary_if->net_dev->dev_addr; | |
651 | orig_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
652 | } else { | |
c018ad3d AQ |
653 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
654 | vid); | |
7c1fd91d AQ |
655 | if (!orig_node) |
656 | goto out; | |
657 | ||
658 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
659 | goto out; | |
660 | ||
661 | orig_addr = orig_node->orig; | |
662 | orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
663 | } | |
664 | ||
665 | /* update the packet header */ | |
8fdd0153 | 666 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d AQ |
667 | unicast_packet->ttvn = orig_ttvn; |
668 | ||
669 | ret = true; | |
670 | out: | |
671 | if (primary_if) | |
672 | batadv_hardif_free_ref(primary_if); | |
673 | if (orig_node) | |
674 | batadv_orig_node_free_ref(orig_node); | |
675 | ||
676 | return ret; | |
677 | } | |
678 | ||
56303d34 | 679 | static int batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
dd981ab0 | 680 | struct sk_buff *skb, int hdr_len) { |
c018ad3d AQ |
681 | struct batadv_unicast_packet *unicast_packet; |
682 | struct batadv_hard_iface *primary_if; | |
56303d34 | 683 | struct batadv_orig_node *orig_node; |
c018ad3d | 684 | uint8_t curr_ttvn, old_ttvn; |
a73105b8 | 685 | struct ethhdr *ethhdr; |
c018ad3d | 686 | unsigned short vid; |
3e34819e | 687 | int is_old_ttvn; |
a73105b8 | 688 | |
b8fcfa42 | 689 | /* check if there is enough data before accessing it */ |
f1791425 | 690 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
b8fcfa42 AQ |
691 | return 0; |
692 | ||
693 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
694 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
a73105b8 AQ |
695 | return 0; |
696 | ||
96412690 | 697 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 698 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 699 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 700 | |
7c1fd91d AQ |
701 | /* check if the destination client was served by this node and it is now |
702 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
703 | * message and that it knows the new destination in the mesh to re-route | |
704 | * the packet to | |
705 | */ | |
c018ad3d | 706 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 707 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 708 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
709 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
710 | bat_priv, | |
711 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
712 | unicast_packet->dest, | |
713 | ethhdr->h_dest); | |
7c1fd91d AQ |
714 | /* at this point the mesh destination should have been |
715 | * substituted with the originator address found in the global | |
716 | * table. If not, let the packet go untouched anyway because | |
717 | * there is nothing the node can do | |
718 | */ | |
719 | return 1; | |
720 | } | |
721 | ||
722 | /* retrieve the TTVN known by this node for the packet destination. This | |
723 | * value is used later to check if the node which sent (or re-routed | |
724 | * last time) the packet had an updated information or not | |
725 | */ | |
726 | curr_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn); | |
fe8a93b9 | 727 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
728 | orig_node = batadv_orig_hash_find(bat_priv, |
729 | unicast_packet->dest); | |
7c1fd91d AQ |
730 | /* if it is not possible to find the orig_node representing the |
731 | * destination, the packet can immediately be dropped as it will | |
732 | * not be possible to deliver it | |
733 | */ | |
a73105b8 AQ |
734 | if (!orig_node) |
735 | return 0; | |
736 | ||
737 | curr_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); | |
7d211efc | 738 | batadv_orig_node_free_ref(orig_node); |
a73105b8 AQ |
739 | } |
740 | ||
7c1fd91d AQ |
741 | /* check if the TTVN contained in the packet is fresher than what the |
742 | * node knows | |
743 | */ | |
3e34819e | 744 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d AQ |
745 | if (!is_old_ttvn) |
746 | return 1; | |
a73105b8 | 747 | |
7c1fd91d AQ |
748 | old_ttvn = unicast_packet->ttvn; |
749 | /* the packet was forged based on outdated network information. Its | |
750 | * destination can possibly be updated and forwarded towards the new | |
751 | * target host | |
752 | */ | |
753 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 754 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
755 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
756 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
757 | unicast_packet->dest, ethhdr->h_dest, | |
758 | old_ttvn, curr_ttvn); | |
7c1fd91d AQ |
759 | return 1; |
760 | } | |
3275e7cc | 761 | |
7c1fd91d AQ |
762 | /* the packet has not been re-routed: either the destination is |
763 | * currently served by this node or there is no destination at all and | |
764 | * it is possible to drop the packet | |
765 | */ | |
c018ad3d | 766 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
7c1fd91d | 767 | return 0; |
3275e7cc | 768 | |
7c1fd91d AQ |
769 | /* update the header in order to let the packet be delivered to this |
770 | * node's soft interface | |
771 | */ | |
772 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
773 | if (!primary_if) | |
774 | return 0; | |
a73105b8 | 775 | |
8fdd0153 | 776 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91d AQ |
777 | |
778 | batadv_hardif_free_ref(primary_if); | |
779 | ||
780 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 781 | |
a73105b8 AQ |
782 | return 1; |
783 | } | |
784 | ||
a1f1ac5c SW |
785 | /** |
786 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
787 | * are in the unicast number space but not yet known to the implementation | |
788 | * @skb: unicast tvlv packet to process | |
789 | * @recv_if: pointer to interface this packet was received on | |
790 | * | |
791 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
792 | * otherwise. | |
793 | */ | |
794 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
795 | struct batadv_hard_iface *recv_if) | |
796 | { | |
797 | struct batadv_unicast_packet *unicast_packet; | |
798 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
799 | int check, hdr_size = sizeof(*unicast_packet); | |
800 | ||
801 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
802 | if (check < 0) | |
803 | return NET_RX_DROP; | |
804 | ||
805 | /* we don't know about this type, drop it. */ | |
806 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
807 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
808 | return NET_RX_DROP; | |
809 | ||
810 | return batadv_route_unicast_packet(skb, recv_if); | |
811 | } | |
812 | ||
56303d34 SE |
813 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
814 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 815 | { |
56303d34 | 816 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 817 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 818 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9affec6b AQ |
819 | uint8_t *orig_addr; |
820 | struct batadv_orig_node *orig_node = NULL; | |
612d2b4f | 821 | int check, hdr_size = sizeof(*unicast_packet); |
c384ea3e | 822 | bool is4addr; |
c6c8fea2 | 823 | |
7cdcf6dd | 824 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 825 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 826 | |
a40d9b07 | 827 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 828 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 829 | if (is4addr) |
4046b24a | 830 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 831 | |
612d2b4f | 832 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 833 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
834 | |
835 | /* Even though the packet is not for us, we might save it to use for | |
836 | * decoding a later received coded packet | |
837 | */ | |
838 | if (check == -EREMOTE) | |
839 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
840 | ||
841 | if (check < 0) | |
c6c8fea2 | 842 | return NET_RX_DROP; |
dd981ab0 | 843 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
844 | return NET_RX_DROP; |
845 | ||
c6c8fea2 | 846 | /* packet for me */ |
fe8a93b9 | 847 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 848 | if (is4addr) { |
4046b24a MH |
849 | batadv_dat_inc_counter(bat_priv, |
850 | unicast_4addr_packet->subtype); | |
9affec6b AQ |
851 | orig_addr = unicast_4addr_packet->src; |
852 | orig_node = batadv_orig_hash_find(bat_priv, orig_addr); | |
853 | } | |
4046b24a | 854 | |
c384ea3e AQ |
855 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
856 | hdr_size)) | |
857 | goto rx_success; | |
858 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
859 | hdr_size)) | |
860 | goto rx_success; | |
861 | ||
37135173 | 862 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
9affec6b | 863 | orig_node); |
37135173 | 864 | |
c384ea3e | 865 | rx_success: |
9affec6b AQ |
866 | if (orig_node) |
867 | batadv_orig_node_free_ref(orig_node); | |
868 | ||
c6c8fea2 SE |
869 | return NET_RX_SUCCESS; |
870 | } | |
871 | ||
63b01037 | 872 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
873 | } |
874 | ||
ef261577 ML |
875 | /** |
876 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
877 | * @skb: unicast tvlv packet to process | |
878 | * @recv_if: pointer to interface this packet was received on | |
879 | * @dst_addr: the payload destination | |
880 | * | |
881 | * Returns NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
882 | * otherwise. | |
883 | */ | |
884 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
885 | struct batadv_hard_iface *recv_if) | |
886 | { | |
887 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
888 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
889 | unsigned char *tvlv_buff; | |
890 | uint16_t tvlv_buff_len; | |
891 | int hdr_size = sizeof(*unicast_tvlv_packet); | |
892 | int ret = NET_RX_DROP; | |
893 | ||
894 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
895 | return NET_RX_DROP; | |
896 | ||
897 | /* the header is likely to be modified while forwarding */ | |
898 | if (skb_cow(skb, hdr_size) < 0) | |
899 | return NET_RX_DROP; | |
900 | ||
901 | /* packet needs to be linearized to access the tvlv content */ | |
902 | if (skb_linearize(skb) < 0) | |
903 | return NET_RX_DROP; | |
904 | ||
905 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
906 | ||
907 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
908 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
909 | ||
910 | if (tvlv_buff_len > skb->len - hdr_size) | |
911 | return NET_RX_DROP; | |
912 | ||
913 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
914 | unicast_tvlv_packet->src, | |
915 | unicast_tvlv_packet->dst, | |
916 | tvlv_buff, tvlv_buff_len); | |
917 | ||
918 | if (ret != NET_RX_SUCCESS) | |
919 | ret = batadv_route_unicast_packet(skb, recv_if); | |
05c3c8a6 AQ |
920 | else |
921 | consume_skb(skb); | |
ef261577 ML |
922 | |
923 | return ret; | |
924 | } | |
c6c8fea2 | 925 | |
610bfc6b MH |
926 | /** |
927 | * batadv_recv_frag_packet - process received fragment | |
928 | * @skb: the received fragment | |
929 | * @recv_if: interface that the skb is received on | |
930 | * | |
931 | * This function does one of the three following things: 1) Forward fragment, if | |
932 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
933 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
934 | * | |
935 | * Return NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. | |
936 | */ | |
937 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
938 | struct batadv_hard_iface *recv_if) | |
939 | { | |
940 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
941 | struct batadv_orig_node *orig_node_src = NULL; | |
942 | struct batadv_frag_packet *frag_packet; | |
943 | int ret = NET_RX_DROP; | |
944 | ||
945 | if (batadv_check_unicast_packet(bat_priv, skb, | |
946 | sizeof(*frag_packet)) < 0) | |
947 | goto out; | |
948 | ||
949 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
950 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
951 | if (!orig_node_src) | |
952 | goto out; | |
953 | ||
954 | /* Route the fragment if it is not for us and too big to be merged. */ | |
955 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
956 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
957 | ret = NET_RX_SUCCESS; | |
958 | goto out; | |
959 | } | |
960 | ||
961 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
962 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
963 | ||
964 | /* Add fragment to buffer and merge if possible. */ | |
965 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
966 | goto out; | |
967 | ||
968 | /* Deliver merged packet to the appropriate handler, if it was | |
969 | * merged | |
970 | */ | |
971 | if (skb) | |
972 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
973 | &recv_if->batman_adv_ptype, NULL); | |
974 | ||
975 | ret = NET_RX_SUCCESS; | |
976 | ||
977 | out: | |
978 | if (orig_node_src) | |
979 | batadv_orig_node_free_ref(orig_node_src); | |
980 | ||
981 | return ret; | |
982 | } | |
983 | ||
56303d34 SE |
984 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
985 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 986 | { |
56303d34 SE |
987 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
988 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 989 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 990 | struct ethhdr *ethhdr; |
704509b8 | 991 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 992 | int ret = NET_RX_DROP; |
c6c8fea2 | 993 | int32_t seq_diff; |
3fba7325 | 994 | uint32_t seqno; |
c6c8fea2 SE |
995 | |
996 | /* drop packet if it has not necessary minimum size */ | |
997 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 998 | goto out; |
c6c8fea2 | 999 | |
7ed4be95 | 1000 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1001 | |
1002 | /* packet with broadcast indication but unicast recipient */ | |
1003 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1004 | goto out; |
c6c8fea2 SE |
1005 | |
1006 | /* packet with broadcast sender address */ | |
1007 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1008 | goto out; |
c6c8fea2 SE |
1009 | |
1010 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1011 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1012 | goto out; |
c6c8fea2 | 1013 | |
96412690 | 1014 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1015 | |
1016 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1017 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1018 | goto out; |
c6c8fea2 | 1019 | |
a40d9b07 | 1020 | if (bcast_packet->ttl < 2) |
f3e0008f | 1021 | goto out; |
c6c8fea2 | 1022 | |
da641193 | 1023 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1024 | |
1025 | if (!orig_node) | |
b5a6f69c | 1026 | goto out; |
c6c8fea2 | 1027 | |
f3e0008f | 1028 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1029 | |
3fba7325 | 1030 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1031 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1032 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1033 | seqno)) |
f3e0008f | 1034 | goto spin_unlock; |
c6c8fea2 | 1035 | |
3fba7325 | 1036 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1037 | |
1038 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 SE |
1039 | if (batadv_window_protected(bat_priv, seq_diff, |
1040 | &orig_node->bcast_seqno_reset)) | |
f3e0008f | 1041 | goto spin_unlock; |
c6c8fea2 SE |
1042 | |
1043 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1044 | * if required. |
1045 | */ | |
0f5f9322 | 1046 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1047 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1048 | |
f3e0008f | 1049 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1050 | |
fe2da6ff | 1051 | /* check whether this has been sent by another originator before */ |
004e86fc | 1052 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1053 | goto out; |
1054 | ||
c54f38c9 SW |
1055 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1056 | ||
c6c8fea2 | 1057 | /* rebroadcast packet */ |
9455e34c | 1058 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1059 | |
23721387 SW |
1060 | /* don't hand the broadcast up if it is from an originator |
1061 | * from the same backbone. | |
1062 | */ | |
08adf151 | 1063 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1064 | goto out; |
1065 | ||
c384ea3e AQ |
1066 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1067 | goto rx_success; | |
1068 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1069 | goto rx_success; | |
1070 | ||
c6c8fea2 | 1071 | /* broadcast for me */ |
37135173 AQ |
1072 | batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, |
1073 | orig_node); | |
c384ea3e AQ |
1074 | |
1075 | rx_success: | |
f3e0008f ML |
1076 | ret = NET_RX_SUCCESS; |
1077 | goto out; | |
c6c8fea2 | 1078 | |
f3e0008f ML |
1079 | spin_unlock: |
1080 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1081 | out: |
1082 | if (orig_node) | |
7d211efc | 1083 | batadv_orig_node_free_ref(orig_node); |
f3e0008f | 1084 | return ret; |
c6c8fea2 | 1085 | } |