Commit | Line | Data |
---|---|---|
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" | |
ba412080 | 43 | #include "log.h" |
1e2c2a4f SE |
44 | #include "network-coding.h" |
45 | #include "originator.h" | |
46 | #include "packet.h" | |
47 | #include "send.h" | |
48 | #include "soft-interface.h" | |
33a3bb4a | 49 | #include "tp_meter.h" |
1e2c2a4f | 50 | #include "translation-table.h" |
1f8dce49 | 51 | #include "tvlv.h" |
c018ad3d | 52 | |
63b01037 | 53 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 54 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 55 | |
7351a482 SW |
56 | /** |
57 | * _batadv_update_route - set the router for this originator | |
58 | * @bat_priv: the bat priv with all the soft interface information | |
59 | * @orig_node: orig node which is to be configured | |
60 | * @recv_if: the receive interface for which this route is set | |
61 | * @neigh_node: neighbor which should be the next router | |
62 | * | |
63 | * This function does not perform any error checks | |
64 | */ | |
56303d34 SE |
65 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
66 | struct batadv_orig_node *orig_node, | |
7351a482 | 67 | struct batadv_hard_iface *recv_if, |
56303d34 | 68 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 69 | { |
7351a482 | 70 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 71 | struct batadv_neigh_node *curr_router; |
e1a5382f | 72 | |
7351a482 SW |
73 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
74 | if (!orig_ifinfo) | |
75 | return; | |
76 | ||
77 | rcu_read_lock(); | |
78 | curr_router = rcu_dereference(orig_ifinfo->router); | |
77ae32e8 | 79 | if (curr_router && !kref_get_unless_zero(&curr_router->refcount)) |
7351a482 SW |
80 | curr_router = NULL; |
81 | rcu_read_unlock(); | |
a8e7f4bc | 82 | |
c6c8fea2 | 83 | /* route deleted */ |
e1a5382f | 84 | if ((curr_router) && (!neigh_node)) { |
39c75a51 SE |
85 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
86 | "Deleting route towards: %pM\n", orig_node->orig); | |
95fb130d | 87 | batadv_tt_global_del_orig(bat_priv, orig_node, -1, |
08c36d3e | 88 | "Deleted route towards originator"); |
c6c8fea2 | 89 | |
e1a5382f LL |
90 | /* route added */ |
91 | } else if ((!curr_router) && (neigh_node)) { | |
39c75a51 | 92 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
93 | "Adding route towards: %pM (via %pM)\n", |
94 | orig_node->orig, neigh_node->addr); | |
e1a5382f | 95 | /* route changed */ |
bb899b89 | 96 | } else if (neigh_node && curr_router) { |
39c75a51 | 97 | batadv_dbg(BATADV_DBG_ROUTES, bat_priv, |
1eda58bf SE |
98 | "Changing route towards: %pM (now via %pM - was via %pM)\n", |
99 | orig_node->orig, neigh_node->addr, | |
100 | curr_router->addr); | |
c6c8fea2 SE |
101 | } |
102 | ||
e1a5382f | 103 | if (curr_router) |
25bb2509 | 104 | batadv_neigh_node_put(curr_router); |
e1a5382f | 105 | |
e1a5382f | 106 | spin_lock_bh(&orig_node->neigh_list_lock); |
d1a65f17 SE |
107 | /* curr_router used earlier may not be the current orig_ifinfo->router |
108 | * anymore because it was dereferenced outside of the neigh_list_lock | |
109 | * protected region. After the new best neighbor has replace the current | |
110 | * best neighbor the reference counter needs to decrease. Consequently, | |
111 | * the code needs to ensure the curr_router variable contains a pointer | |
112 | * to the replaced best neighbor. | |
113 | */ | |
114 | curr_router = rcu_dereference_protected(orig_ifinfo->router, true); | |
115 | ||
f0b94ebc SE |
116 | /* increase refcount of new best neighbor */ |
117 | if (neigh_node) | |
118 | kref_get(&neigh_node->refcount); | |
119 | ||
7351a482 | 120 | rcu_assign_pointer(orig_ifinfo->router, neigh_node); |
e1a5382f | 121 | spin_unlock_bh(&orig_node->neigh_list_lock); |
35f94779 | 122 | batadv_orig_ifinfo_put(orig_ifinfo); |
e1a5382f LL |
123 | |
124 | /* decrease refcount of previous best neighbor */ | |
125 | if (curr_router) | |
25bb2509 | 126 | batadv_neigh_node_put(curr_router); |
c6c8fea2 SE |
127 | } |
128 | ||
7351a482 SW |
129 | /** |
130 | * batadv_update_route - set the router for this originator | |
131 | * @bat_priv: the bat priv with all the soft interface information | |
132 | * @orig_node: orig node which is to be configured | |
133 | * @recv_if: the receive interface for which this route is set | |
134 | * @neigh_node: neighbor which should be the next router | |
135 | */ | |
56303d34 SE |
136 | void batadv_update_route(struct batadv_priv *bat_priv, |
137 | struct batadv_orig_node *orig_node, | |
7351a482 | 138 | struct batadv_hard_iface *recv_if, |
56303d34 | 139 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 140 | { |
56303d34 | 141 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
142 | |
143 | if (!orig_node) | |
e1a5382f LL |
144 | goto out; |
145 | ||
7351a482 | 146 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 147 | |
e1a5382f | 148 | if (router != neigh_node) |
7351a482 | 149 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
150 | |
151 | out: | |
152 | if (router) | |
25bb2509 | 153 | batadv_neigh_node_put(router); |
c6c8fea2 SE |
154 | } |
155 | ||
62fe710f | 156 | /** |
7afcbbef | 157 | * batadv_window_protected - checks whether the host restarted and is in the |
62fe710f | 158 | * protection time. |
7afcbbef SE |
159 | * @bat_priv: the bat priv with all the soft interface information |
160 | * @seq_num_diff: difference between the current/received sequence number and | |
161 | * the last sequence number | |
81f02683 | 162 | * @seq_old_max_diff: maximum age of sequence number not considered as restart |
7afcbbef SE |
163 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
164 | * is detected | |
81f02683 SW |
165 | * @protection_started: is set to true if the protection window was started, |
166 | * doesn't change otherwise. | |
62fe710f SE |
167 | * |
168 | * Return: | |
4b426b10 SE |
169 | * false if the packet is to be accepted. |
170 | * true if the packet is to be ignored. | |
c6c8fea2 | 171 | */ |
4b426b10 SE |
172 | bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
173 | s32 seq_old_max_diff, unsigned long *last_reset, | |
174 | bool *protection_started) | |
c6c8fea2 | 175 | { |
81f02683 | 176 | if (seq_num_diff <= -seq_old_max_diff || |
42d0b044 SE |
177 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
178 | if (!batadv_has_timed_out(*last_reset, | |
179 | BATADV_RESET_PROTECTION_MS)) | |
4b426b10 | 180 | return true; |
8c7bf248 ML |
181 | |
182 | *last_reset = jiffies; | |
81f02683 SW |
183 | if (protection_started) |
184 | *protection_started = true; | |
39c75a51 | 185 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 186 | "old packet received, start protection\n"); |
c6c8fea2 | 187 | } |
8c7bf248 | 188 | |
4b426b10 | 189 | return false; |
c6c8fea2 SE |
190 | } |
191 | ||
30d3c511 | 192 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 193 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 194 | int header_len) |
c6c8fea2 | 195 | { |
c6c8fea2 SE |
196 | struct ethhdr *ethhdr; |
197 | ||
198 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
199 | if (unlikely(!pskb_may_pull(skb, header_len))) |
200 | return false; | |
c6c8fea2 | 201 | |
7ed4be95 | 202 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
203 | |
204 | /* packet with broadcast indication but unicast recipient */ | |
205 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 206 | return false; |
c6c8fea2 SE |
207 | |
208 | /* packet with broadcast sender address */ | |
209 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
c3e29312 | 210 | return false; |
c6c8fea2 SE |
211 | |
212 | /* create a copy of the skb, if needed, to modify it. */ | |
213 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 214 | return false; |
c6c8fea2 SE |
215 | |
216 | /* keep skb linear */ | |
217 | if (skb_linearize(skb) < 0) | |
c3e29312 | 218 | return false; |
c6c8fea2 | 219 | |
c3e29312 | 220 | return true; |
c6c8fea2 SE |
221 | } |
222 | ||
da6b8c20 SW |
223 | /** |
224 | * batadv_recv_my_icmp_packet - receive an icmp packet locally | |
225 | * @bat_priv: the bat priv with all the soft interface information | |
226 | * @skb: icmp packet to process | |
227 | * | |
62fe710f | 228 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
da6b8c20 SW |
229 | * otherwise. |
230 | */ | |
56303d34 | 231 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 232 | struct sk_buff *skb) |
c6c8fea2 | 233 | { |
56303d34 SE |
234 | struct batadv_hard_iface *primary_if = NULL; |
235 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
236 | struct batadv_icmp_header *icmph; |
237 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 238 | |
da6b8c20 | 239 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 240 | |
da6b8c20 SW |
241 | switch (icmph->msg_type) { |
242 | case BATADV_ECHO_REPLY: | |
243 | case BATADV_DESTINATION_UNREACHABLE: | |
244 | case BATADV_TTL_EXCEEDED: | |
245 | /* receive the packet */ | |
246 | if (skb_linearize(skb) < 0) | |
247 | break; | |
c6c8fea2 | 248 | |
da6b8c20 SW |
249 | batadv_socket_receive_packet(icmph, skb->len); |
250 | break; | |
251 | case BATADV_ECHO_REQUEST: | |
252 | /* answer echo request (ping) */ | |
253 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
254 | if (!primary_if) | |
255 | goto out; | |
256 | ||
257 | /* get routing information */ | |
258 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
259 | if (!orig_node) | |
260 | goto out; | |
261 | ||
262 | /* create a copy of the skb, if needed, to modify it. */ | |
263 | if (skb_cow(skb, ETH_HLEN) < 0) | |
264 | goto out; | |
265 | ||
266 | icmph = (struct batadv_icmp_header *)skb->data; | |
267 | ||
8fdd0153 AQ |
268 | ether_addr_copy(icmph->dst, icmph->orig); |
269 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 270 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 271 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
272 | |
273 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
f50ca95a AQ |
274 | if (res == -1) |
275 | goto out; | |
276 | ||
277 | ret = NET_RX_SUCCESS; | |
da6b8c20 SW |
278 | |
279 | break; | |
33a3bb4a AQ |
280 | case BATADV_TP: |
281 | if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet))) | |
282 | goto out; | |
283 | ||
284 | batadv_tp_meter_recv(bat_priv, skb); | |
285 | ret = NET_RX_SUCCESS; | |
286 | goto out; | |
da6b8c20 SW |
287 | default: |
288 | /* drop unknown type */ | |
44524fcd | 289 | goto out; |
da6b8c20 | 290 | } |
44524fcd | 291 | out: |
32ae9b22 | 292 | if (primary_if) |
82047ad7 | 293 | batadv_hardif_put(primary_if); |
44524fcd | 294 | if (orig_node) |
5d967310 | 295 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
296 | return ret; |
297 | } | |
298 | ||
56303d34 | 299 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 300 | struct sk_buff *skb) |
c6c8fea2 | 301 | { |
56303d34 SE |
302 | struct batadv_hard_iface *primary_if = NULL; |
303 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 304 | struct batadv_icmp_packet *icmp_packet; |
f50ca95a | 305 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 306 | |
96412690 | 307 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
308 | |
309 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 310 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 311 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 312 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 313 | goto out; |
c6c8fea2 SE |
314 | } |
315 | ||
e5d89254 | 316 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 317 | if (!primary_if) |
44524fcd | 318 | goto out; |
c6c8fea2 SE |
319 | |
320 | /* get routing information */ | |
27a417e6 | 321 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 322 | if (!orig_node) |
e1a5382f | 323 | goto out; |
c6c8fea2 | 324 | |
44524fcd | 325 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 326 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 327 | goto out; |
c6c8fea2 | 328 | |
96412690 | 329 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 330 | |
8fdd0153 AQ |
331 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
332 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
333 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
334 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 335 | |
f50ca95a AQ |
336 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
337 | if (res != -1) | |
bb351ba0 | 338 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 339 | |
44524fcd | 340 | out: |
32ae9b22 | 341 | if (primary_if) |
82047ad7 | 342 | batadv_hardif_put(primary_if); |
44524fcd | 343 | if (orig_node) |
5d967310 | 344 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
345 | return ret; |
346 | } | |
347 | ||
56303d34 SE |
348 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
349 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 350 | { |
56303d34 | 351 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
352 | struct batadv_icmp_header *icmph; |
353 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 354 | struct ethhdr *ethhdr; |
56303d34 | 355 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 356 | int hdr_size = sizeof(struct batadv_icmp_header); |
f50ca95a | 357 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 358 | |
c6c8fea2 SE |
359 | /* drop packet if it has not necessary minimum size */ |
360 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
44524fcd | 361 | goto out; |
c6c8fea2 | 362 | |
7ed4be95 | 363 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
364 | |
365 | /* packet with unicast indication but broadcast recipient */ | |
366 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
44524fcd | 367 | goto out; |
c6c8fea2 SE |
368 | |
369 | /* packet with broadcast sender address */ | |
370 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
44524fcd | 371 | goto out; |
c6c8fea2 SE |
372 | |
373 | /* not for me */ | |
fe8a93b9 | 374 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
44524fcd | 375 | goto out; |
c6c8fea2 | 376 | |
da6b8c20 | 377 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
378 | |
379 | /* add record route information if not full */ | |
da6b8c20 SW |
380 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
381 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
382 | (skb->len >= sizeof(struct batadv_icmp_packet_rr))) { | |
383 | if (skb_linearize(skb) < 0) | |
384 | goto out; | |
385 | ||
386 | /* create a copy of the skb, if needed, to modify it. */ | |
387 | if (skb_cow(skb, ETH_HLEN) < 0) | |
388 | goto out; | |
389 | ||
390 | icmph = (struct batadv_icmp_header *)skb->data; | |
391 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
392 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
393 | goto out; | |
394 | ||
8fdd0153 AQ |
395 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
396 | ethhdr->h_dest); | |
da6b8c20 | 397 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
398 | } |
399 | ||
400 | /* packet for me */ | |
da6b8c20 SW |
401 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
402 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
403 | |
404 | /* TTL exceeded */ | |
a40d9b07 | 405 | if (icmph->ttl < 2) |
63b01037 | 406 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 407 | |
c6c8fea2 | 408 | /* get routing information */ |
da6b8c20 | 409 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 410 | if (!orig_node) |
e1a5382f | 411 | goto out; |
c6c8fea2 | 412 | |
44524fcd | 413 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 414 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 415 | goto out; |
c6c8fea2 | 416 | |
da6b8c20 | 417 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 418 | |
44524fcd | 419 | /* decrement ttl */ |
a40d9b07 | 420 | icmph->ttl--; |
44524fcd ML |
421 | |
422 | /* route it */ | |
f50ca95a AQ |
423 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
424 | if (res != -1) | |
bb351ba0 | 425 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 426 | |
44524fcd | 427 | out: |
44524fcd | 428 | if (orig_node) |
5d967310 | 429 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
430 | return ret; |
431 | } | |
432 | ||
f86ce0ad MH |
433 | /** |
434 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 435 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
436 | * @skb: packet to check |
437 | * @hdr_size: size of header to pull | |
438 | * | |
62fe710f SE |
439 | * Check for short header and bad addresses in given packet. |
440 | * | |
441 | * Return: negative value when check fails and 0 otherwise. The negative value | |
442 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
443 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 444 | */ |
fe8a93b9 AQ |
445 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
446 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
447 | { |
448 | struct ethhdr *ethhdr; | |
449 | ||
450 | /* drop packet if it has not necessary minimum size */ | |
451 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 452 | return -ENODATA; |
ff51fd70 | 453 | |
7ed4be95 | 454 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
455 | |
456 | /* packet with unicast indication but broadcast recipient */ | |
457 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 458 | return -EBADR; |
ff51fd70 MH |
459 | |
460 | /* packet with broadcast sender address */ | |
461 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 462 | return -EBADR; |
ff51fd70 MH |
463 | |
464 | /* not for me */ | |
fe8a93b9 | 465 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 466 | return -EREMOTE; |
ff51fd70 MH |
467 | |
468 | return 0; | |
469 | } | |
470 | ||
f6c8b711 SW |
471 | /** |
472 | * batadv_find_router - find a suitable router for this originator | |
473 | * @bat_priv: the bat priv with all the soft interface information | |
474 | * @orig_node: the destination node | |
475 | * @recv_if: pointer to interface this packet was received on | |
476 | * | |
62fe710f | 477 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 478 | * this interface, or NULL if not available. |
9cfc7bd6 | 479 | */ |
56303d34 SE |
480 | struct batadv_neigh_node * |
481 | batadv_find_router(struct batadv_priv *bat_priv, | |
482 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 483 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 484 | { |
f3b3d901 SW |
485 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
486 | struct batadv_neigh_node *first_candidate_router = NULL; | |
487 | struct batadv_neigh_node *next_candidate_router = NULL; | |
488 | struct batadv_neigh_node *router, *cand_router = NULL; | |
489 | struct batadv_neigh_node *last_cand_router = NULL; | |
490 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
491 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
492 | struct batadv_orig_ifinfo *last_candidate; | |
493 | bool last_candidate_found = false; | |
c6c8fea2 SE |
494 | |
495 | if (!orig_node) | |
496 | return NULL; | |
497 | ||
7351a482 | 498 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 499 | |
329887ad SW |
500 | if (!router) |
501 | return router; | |
502 | ||
f3b3d901 SW |
503 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
504 | * and if activated. | |
505 | */ | |
329887ad | 506 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
507 | return router; |
508 | ||
509 | /* bonding: loop through the list of possible routers found | |
510 | * for the various outgoing interfaces and find a candidate after | |
511 | * the last chosen bonding candidate (next_candidate). If no such | |
512 | * router is found, use the first candidate found (the previously | |
513 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 514 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
515 | * router - obviously there are no other candidates. |
516 | */ | |
517 | rcu_read_lock(); | |
518 | last_candidate = orig_node->last_bonding_candidate; | |
519 | if (last_candidate) | |
520 | last_cand_router = rcu_dereference(last_candidate->router); | |
521 | ||
522 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
523 | /* acquire some structures and references ... */ | |
a6ba0d34 | 524 | if (!kref_get_unless_zero(&cand->refcount)) |
f3b3d901 SW |
525 | continue; |
526 | ||
527 | cand_router = rcu_dereference(cand->router); | |
528 | if (!cand_router) | |
529 | goto next; | |
530 | ||
77ae32e8 | 531 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
f3b3d901 SW |
532 | cand_router = NULL; |
533 | goto next; | |
534 | } | |
535 | ||
536 | /* alternative candidate should be good enough to be | |
537 | * considered | |
538 | */ | |
18165f6f SW |
539 | if (!bao->bat_neigh_is_similar_or_better(cand_router, |
540 | cand->if_outgoing, | |
541 | router, recv_if)) | |
f3b3d901 SW |
542 | goto next; |
543 | ||
544 | /* don't use the same router twice */ | |
545 | if (last_cand_router == cand_router) | |
546 | goto next; | |
547 | ||
548 | /* mark the first possible candidate */ | |
549 | if (!first_candidate) { | |
77ae32e8 | 550 | kref_get(&cand_router->refcount); |
a6ba0d34 | 551 | kref_get(&cand->refcount); |
f3b3d901 SW |
552 | first_candidate = cand; |
553 | first_candidate_router = cand_router; | |
554 | } | |
555 | ||
556 | /* check if the loop has already passed the previously selected | |
557 | * candidate ... this function should select the next candidate | |
558 | * AFTER the previously used bonding candidate. | |
559 | */ | |
560 | if (!last_candidate || last_candidate_found) { | |
561 | next_candidate = cand; | |
562 | next_candidate_router = cand_router; | |
563 | break; | |
564 | } | |
565 | ||
566 | if (last_candidate == cand) | |
567 | last_candidate_found = true; | |
568 | next: | |
569 | /* free references */ | |
570 | if (cand_router) { | |
25bb2509 | 571 | batadv_neigh_node_put(cand_router); |
f3b3d901 SW |
572 | cand_router = NULL; |
573 | } | |
35f94779 | 574 | batadv_orig_ifinfo_put(cand); |
f3b3d901 SW |
575 | } |
576 | rcu_read_unlock(); | |
577 | ||
578 | /* last_bonding_candidate is reset below, remove the old reference. */ | |
579 | if (orig_node->last_bonding_candidate) | |
35f94779 | 580 | batadv_orig_ifinfo_put(orig_node->last_bonding_candidate); |
f3b3d901 SW |
581 | |
582 | /* After finding candidates, handle the three cases: | |
583 | * 1) there is a next candidate, use that | |
584 | * 2) there is no next candidate, use the first of the list | |
585 | * 3) there is no candidate at all, return the default router | |
586 | */ | |
587 | if (next_candidate) { | |
25bb2509 | 588 | batadv_neigh_node_put(router); |
f3b3d901 SW |
589 | |
590 | /* remove references to first candidate, we don't need it. */ | |
591 | if (first_candidate) { | |
25bb2509 | 592 | batadv_neigh_node_put(first_candidate_router); |
35f94779 | 593 | batadv_orig_ifinfo_put(first_candidate); |
f3b3d901 SW |
594 | } |
595 | router = next_candidate_router; | |
596 | orig_node->last_bonding_candidate = next_candidate; | |
597 | } else if (first_candidate) { | |
25bb2509 | 598 | batadv_neigh_node_put(router); |
f3b3d901 SW |
599 | |
600 | /* refcounting has already been done in the loop above. */ | |
601 | router = first_candidate_router; | |
602 | orig_node->last_bonding_candidate = first_candidate; | |
603 | } else { | |
604 | orig_node->last_bonding_candidate = NULL; | |
605 | } | |
f6c8b711 | 606 | |
c6c8fea2 SE |
607 | return router; |
608 | } | |
609 | ||
63b01037 | 610 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 611 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 612 | { |
56303d34 SE |
613 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
614 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 615 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 616 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 617 | int res, hdr_len, ret = NET_RX_DROP; |
63d443ef | 618 | unsigned int len; |
c6c8fea2 | 619 | |
96412690 | 620 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
621 | |
622 | /* TTL exceeded */ | |
a40d9b07 | 623 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
624 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
625 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 626 | goto out; |
c6c8fea2 SE |
627 | } |
628 | ||
629 | /* get routing information */ | |
da641193 | 630 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 631 | |
44524fcd | 632 | if (!orig_node) |
b5a6f69c | 633 | goto out; |
c6c8fea2 | 634 | |
c6c8fea2 | 635 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 636 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 637 | goto out; |
c6c8fea2 | 638 | |
c6c8fea2 | 639 | /* decrement ttl */ |
f097e25d | 640 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 641 | unicast_packet->ttl--; |
c6c8fea2 | 642 | |
a40d9b07 | 643 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
644 | case BATADV_UNICAST_4ADDR: |
645 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
646 | break; | |
647 | case BATADV_UNICAST: | |
648 | hdr_len = sizeof(struct batadv_unicast_packet); | |
649 | break; | |
650 | default: | |
651 | /* other packet types not supported - yet */ | |
652 | hdr_len = -1; | |
653 | break; | |
654 | } | |
655 | ||
656 | if (hdr_len > 0) | |
657 | batadv_skb_set_priority(skb, hdr_len); | |
658 | ||
63d443ef | 659 | len = skb->len; |
e91ecfc6 | 660 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
f50ca95a AQ |
661 | if (res == -1) |
662 | goto out; | |
95332477 | 663 | |
e91ecfc6 MH |
664 | /* translate transmit result into receive result */ |
665 | if (res == NET_XMIT_SUCCESS) { | |
666 | /* skb was transmitted and consumed */ | |
95332477 MH |
667 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
668 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
63d443ef | 669 | len + ETH_HLEN); |
95332477 | 670 | } |
c6c8fea2 | 671 | |
f50ca95a AQ |
672 | ret = NET_RX_SUCCESS; |
673 | ||
44524fcd | 674 | out: |
44524fcd | 675 | if (orig_node) |
5d967310 | 676 | batadv_orig_node_put(orig_node); |
44524fcd | 677 | return ret; |
c6c8fea2 SE |
678 | } |
679 | ||
7c1fd91d AQ |
680 | /** |
681 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
682 | * @bat_priv: the bat priv with all the soft interface information | |
683 | * @unicast_packet: the unicast header to be updated | |
684 | * @dst_addr: the payload destination | |
c018ad3d | 685 | * @vid: VLAN identifier |
7c1fd91d AQ |
686 | * |
687 | * Search the translation table for dst_addr and update the unicast header with | |
688 | * the new corresponding information (originator address where the destination | |
689 | * client currently is and its known TTVN) | |
690 | * | |
62fe710f | 691 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
692 | */ |
693 | static bool | |
694 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
695 | struct batadv_unicast_packet *unicast_packet, | |
6b5e971a | 696 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
697 | { |
698 | struct batadv_orig_node *orig_node = NULL; | |
699 | struct batadv_hard_iface *primary_if = NULL; | |
700 | bool ret = false; | |
6b5e971a | 701 | u8 *orig_addr, orig_ttvn; |
7c1fd91d | 702 | |
c018ad3d | 703 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
704 | primary_if = batadv_primary_if_get_selected(bat_priv); |
705 | if (!primary_if) | |
706 | goto out; | |
707 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 708 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 709 | } else { |
c018ad3d AQ |
710 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
711 | vid); | |
7c1fd91d AQ |
712 | if (!orig_node) |
713 | goto out; | |
714 | ||
715 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
716 | goto out; | |
717 | ||
718 | orig_addr = orig_node->orig; | |
6b5e971a | 719 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
720 | } |
721 | ||
722 | /* update the packet header */ | |
8fdd0153 | 723 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d AQ |
724 | unicast_packet->ttvn = orig_ttvn; |
725 | ||
726 | ret = true; | |
727 | out: | |
728 | if (primary_if) | |
82047ad7 | 729 | batadv_hardif_put(primary_if); |
7c1fd91d | 730 | if (orig_node) |
5d967310 | 731 | batadv_orig_node_put(orig_node); |
7c1fd91d AQ |
732 | |
733 | return ret; | |
734 | } | |
735 | ||
4b426b10 SE |
736 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
737 | struct sk_buff *skb, int hdr_len) | |
738 | { | |
c018ad3d AQ |
739 | struct batadv_unicast_packet *unicast_packet; |
740 | struct batadv_hard_iface *primary_if; | |
56303d34 | 741 | struct batadv_orig_node *orig_node; |
6b5e971a | 742 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 743 | struct ethhdr *ethhdr; |
c018ad3d | 744 | unsigned short vid; |
3e34819e | 745 | int is_old_ttvn; |
a73105b8 | 746 | |
b8fcfa42 | 747 | /* check if there is enough data before accessing it */ |
f1791425 | 748 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
4b426b10 | 749 | return false; |
b8fcfa42 AQ |
750 | |
751 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
752 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
4b426b10 | 753 | return false; |
a73105b8 | 754 | |
96412690 | 755 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 756 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 757 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 758 | |
7c1fd91d AQ |
759 | /* check if the destination client was served by this node and it is now |
760 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
761 | * message and that it knows the new destination in the mesh to re-route | |
762 | * the packet to | |
763 | */ | |
c018ad3d | 764 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 765 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 766 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
767 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
768 | bat_priv, | |
769 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
770 | unicast_packet->dest, | |
771 | ethhdr->h_dest); | |
7c1fd91d AQ |
772 | /* at this point the mesh destination should have been |
773 | * substituted with the originator address found in the global | |
774 | * table. If not, let the packet go untouched anyway because | |
775 | * there is nothing the node can do | |
776 | */ | |
4b426b10 | 777 | return true; |
7c1fd91d AQ |
778 | } |
779 | ||
780 | /* retrieve the TTVN known by this node for the packet destination. This | |
781 | * value is used later to check if the node which sent (or re-routed | |
782 | * last time) the packet had an updated information or not | |
783 | */ | |
6b5e971a | 784 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 785 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
786 | orig_node = batadv_orig_hash_find(bat_priv, |
787 | unicast_packet->dest); | |
7c1fd91d AQ |
788 | /* if it is not possible to find the orig_node representing the |
789 | * destination, the packet can immediately be dropped as it will | |
790 | * not be possible to deliver it | |
791 | */ | |
a73105b8 | 792 | if (!orig_node) |
4b426b10 | 793 | return false; |
a73105b8 | 794 | |
6b5e971a | 795 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
5d967310 | 796 | batadv_orig_node_put(orig_node); |
a73105b8 AQ |
797 | } |
798 | ||
7c1fd91d AQ |
799 | /* check if the TTVN contained in the packet is fresher than what the |
800 | * node knows | |
801 | */ | |
3e34819e | 802 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d | 803 | if (!is_old_ttvn) |
4b426b10 | 804 | return true; |
a73105b8 | 805 | |
7c1fd91d AQ |
806 | old_ttvn = unicast_packet->ttvn; |
807 | /* the packet was forged based on outdated network information. Its | |
808 | * destination can possibly be updated and forwarded towards the new | |
809 | * target host | |
810 | */ | |
811 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 812 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
813 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
814 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
815 | unicast_packet->dest, ethhdr->h_dest, | |
816 | old_ttvn, curr_ttvn); | |
4b426b10 | 817 | return true; |
7c1fd91d | 818 | } |
3275e7cc | 819 | |
7c1fd91d AQ |
820 | /* the packet has not been re-routed: either the destination is |
821 | * currently served by this node or there is no destination at all and | |
822 | * it is possible to drop the packet | |
823 | */ | |
c018ad3d | 824 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
4b426b10 | 825 | return false; |
3275e7cc | 826 | |
7c1fd91d AQ |
827 | /* update the header in order to let the packet be delivered to this |
828 | * node's soft interface | |
829 | */ | |
830 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
831 | if (!primary_if) | |
4b426b10 | 832 | return false; |
a73105b8 | 833 | |
8fdd0153 | 834 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91d | 835 | |
82047ad7 | 836 | batadv_hardif_put(primary_if); |
7c1fd91d AQ |
837 | |
838 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 839 | |
4b426b10 | 840 | return true; |
a73105b8 AQ |
841 | } |
842 | ||
a1f1ac5c SW |
843 | /** |
844 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
845 | * are in the unicast number space but not yet known to the implementation | |
846 | * @skb: unicast tvlv packet to process | |
847 | * @recv_if: pointer to interface this packet was received on | |
848 | * | |
62fe710f | 849 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
850 | * otherwise. |
851 | */ | |
852 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
853 | struct batadv_hard_iface *recv_if) | |
854 | { | |
855 | struct batadv_unicast_packet *unicast_packet; | |
856 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
857 | int check, hdr_size = sizeof(*unicast_packet); | |
858 | ||
859 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
860 | if (check < 0) | |
861 | return NET_RX_DROP; | |
862 | ||
863 | /* we don't know about this type, drop it. */ | |
864 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
865 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
866 | return NET_RX_DROP; | |
867 | ||
868 | return batadv_route_unicast_packet(skb, recv_if); | |
869 | } | |
870 | ||
56303d34 SE |
871 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
872 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 873 | { |
56303d34 | 874 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 875 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 876 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
6b5e971a | 877 | u8 *orig_addr; |
9affec6b | 878 | struct batadv_orig_node *orig_node = NULL; |
612d2b4f | 879 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 880 | enum batadv_subtype subtype; |
c384ea3e | 881 | bool is4addr; |
c6c8fea2 | 882 | |
7cdcf6dd | 883 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 884 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 885 | |
a40d9b07 | 886 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 887 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 888 | if (is4addr) |
4046b24a | 889 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 890 | |
612d2b4f | 891 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 892 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
893 | |
894 | /* Even though the packet is not for us, we might save it to use for | |
895 | * decoding a later received coded packet | |
896 | */ | |
897 | if (check == -EREMOTE) | |
898 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
899 | ||
900 | if (check < 0) | |
c6c8fea2 | 901 | return NET_RX_DROP; |
dd981ab0 | 902 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
903 | return NET_RX_DROP; |
904 | ||
c6c8fea2 | 905 | /* packet for me */ |
fe8a93b9 | 906 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 907 | if (is4addr) { |
437bb0e6 SW |
908 | subtype = unicast_4addr_packet->subtype; |
909 | batadv_dat_inc_counter(bat_priv, subtype); | |
910 | ||
911 | /* Only payload data should be considered for speedy | |
912 | * join. For example, DAT also uses unicast 4addr | |
913 | * types, but those packets should not be considered | |
914 | * for speedy join, since the clients do not actually | |
915 | * reside at the sending originator. | |
916 | */ | |
917 | if (subtype == BATADV_P_DATA) { | |
918 | orig_addr = unicast_4addr_packet->src; | |
919 | orig_node = batadv_orig_hash_find(bat_priv, | |
920 | orig_addr); | |
921 | } | |
9affec6b | 922 | } |
4046b24a | 923 | |
c384ea3e AQ |
924 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
925 | hdr_size)) | |
926 | goto rx_success; | |
927 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
928 | hdr_size)) | |
929 | goto rx_success; | |
930 | ||
6535db56 | 931 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
9affec6b | 932 | orig_node); |
37135173 | 933 | |
c384ea3e | 934 | rx_success: |
9affec6b | 935 | if (orig_node) |
5d967310 | 936 | batadv_orig_node_put(orig_node); |
9affec6b | 937 | |
c6c8fea2 SE |
938 | return NET_RX_SUCCESS; |
939 | } | |
940 | ||
63b01037 | 941 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
942 | } |
943 | ||
ef261577 ML |
944 | /** |
945 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
946 | * @skb: unicast tvlv packet to process | |
947 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 948 | * |
62fe710f | 949 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
950 | * otherwise. |
951 | */ | |
952 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
953 | struct batadv_hard_iface *recv_if) | |
954 | { | |
955 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
956 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
957 | unsigned char *tvlv_buff; | |
6b5e971a | 958 | u16 tvlv_buff_len; |
ef261577 ML |
959 | int hdr_size = sizeof(*unicast_tvlv_packet); |
960 | int ret = NET_RX_DROP; | |
961 | ||
962 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
963 | return NET_RX_DROP; | |
964 | ||
965 | /* the header is likely to be modified while forwarding */ | |
966 | if (skb_cow(skb, hdr_size) < 0) | |
967 | return NET_RX_DROP; | |
968 | ||
969 | /* packet needs to be linearized to access the tvlv content */ | |
970 | if (skb_linearize(skb) < 0) | |
971 | return NET_RX_DROP; | |
972 | ||
973 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
974 | ||
975 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
976 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
977 | ||
978 | if (tvlv_buff_len > skb->len - hdr_size) | |
979 | return NET_RX_DROP; | |
980 | ||
981 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
982 | unicast_tvlv_packet->src, | |
983 | unicast_tvlv_packet->dst, | |
984 | tvlv_buff, tvlv_buff_len); | |
985 | ||
986 | if (ret != NET_RX_SUCCESS) | |
987 | ret = batadv_route_unicast_packet(skb, recv_if); | |
05c3c8a6 AQ |
988 | else |
989 | consume_skb(skb); | |
ef261577 ML |
990 | |
991 | return ret; | |
992 | } | |
c6c8fea2 | 993 | |
610bfc6b MH |
994 | /** |
995 | * batadv_recv_frag_packet - process received fragment | |
996 | * @skb: the received fragment | |
997 | * @recv_if: interface that the skb is received on | |
998 | * | |
999 | * This function does one of the three following things: 1) Forward fragment, if | |
1000 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1001 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1002 | * | |
62fe710f | 1003 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
1004 | */ |
1005 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1006 | struct batadv_hard_iface *recv_if) | |
1007 | { | |
1008 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1009 | struct batadv_orig_node *orig_node_src = NULL; | |
1010 | struct batadv_frag_packet *frag_packet; | |
1011 | int ret = NET_RX_DROP; | |
1012 | ||
1013 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1014 | sizeof(*frag_packet)) < 0) | |
1015 | goto out; | |
1016 | ||
1017 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1018 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1019 | if (!orig_node_src) | |
1020 | goto out; | |
1021 | ||
c0f25c80 AL |
1022 | skb->priority = frag_packet->priority + 256; |
1023 | ||
610bfc6b MH |
1024 | /* Route the fragment if it is not for us and too big to be merged. */ |
1025 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1026 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1027 | ret = NET_RX_SUCCESS; | |
1028 | goto out; | |
1029 | } | |
1030 | ||
1031 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1032 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1033 | ||
1034 | /* Add fragment to buffer and merge if possible. */ | |
1035 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1036 | goto out; | |
1037 | ||
1038 | /* Deliver merged packet to the appropriate handler, if it was | |
1039 | * merged | |
1040 | */ | |
1041 | if (skb) | |
1042 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1043 | &recv_if->batman_adv_ptype, NULL); | |
1044 | ||
1045 | ret = NET_RX_SUCCESS; | |
1046 | ||
1047 | out: | |
1048 | if (orig_node_src) | |
5d967310 | 1049 | batadv_orig_node_put(orig_node_src); |
610bfc6b MH |
1050 | |
1051 | return ret; | |
1052 | } | |
1053 | ||
56303d34 SE |
1054 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1055 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1056 | { |
56303d34 SE |
1057 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1058 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1059 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1060 | struct ethhdr *ethhdr; |
704509b8 | 1061 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1062 | int ret = NET_RX_DROP; |
6b5e971a SE |
1063 | s32 seq_diff; |
1064 | u32 seqno; | |
c6c8fea2 SE |
1065 | |
1066 | /* drop packet if it has not necessary minimum size */ | |
1067 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1068 | goto out; |
c6c8fea2 | 1069 | |
7ed4be95 | 1070 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1071 | |
1072 | /* packet with broadcast indication but unicast recipient */ | |
1073 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1074 | goto out; |
c6c8fea2 SE |
1075 | |
1076 | /* packet with broadcast sender address */ | |
1077 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1078 | goto out; |
c6c8fea2 SE |
1079 | |
1080 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1081 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1082 | goto out; |
c6c8fea2 | 1083 | |
96412690 | 1084 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1085 | |
1086 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1087 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1088 | goto out; |
c6c8fea2 | 1089 | |
a40d9b07 | 1090 | if (bcast_packet->ttl < 2) |
f3e0008f | 1091 | goto out; |
c6c8fea2 | 1092 | |
da641193 | 1093 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1094 | |
1095 | if (!orig_node) | |
b5a6f69c | 1096 | goto out; |
c6c8fea2 | 1097 | |
f3e0008f | 1098 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1099 | |
3fba7325 | 1100 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1101 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1102 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1103 | seqno)) |
f3e0008f | 1104 | goto spin_unlock; |
c6c8fea2 | 1105 | |
3fba7325 | 1106 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1107 | |
1108 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 | 1109 | if (batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1110 | BATADV_BCAST_MAX_AGE, |
1111 | &orig_node->bcast_seqno_reset, NULL)) | |
f3e0008f | 1112 | goto spin_unlock; |
c6c8fea2 SE |
1113 | |
1114 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1115 | * if required. |
1116 | */ | |
0f5f9322 | 1117 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1118 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1119 | |
f3e0008f | 1120 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1121 | |
fe2da6ff | 1122 | /* check whether this has been sent by another originator before */ |
004e86fc | 1123 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1124 | goto out; |
1125 | ||
c54f38c9 SW |
1126 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1127 | ||
c6c8fea2 | 1128 | /* rebroadcast packet */ |
9455e34c | 1129 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1130 | |
23721387 SW |
1131 | /* don't hand the broadcast up if it is from an originator |
1132 | * from the same backbone. | |
1133 | */ | |
08adf151 | 1134 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1135 | goto out; |
1136 | ||
c384ea3e AQ |
1137 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1138 | goto rx_success; | |
1139 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1140 | goto rx_success; | |
1141 | ||
c6c8fea2 | 1142 | /* broadcast for me */ |
6535db56 | 1143 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
c384ea3e AQ |
1144 | |
1145 | rx_success: | |
f3e0008f ML |
1146 | ret = NET_RX_SUCCESS; |
1147 | goto out; | |
c6c8fea2 | 1148 | |
f3e0008f ML |
1149 | spin_unlock: |
1150 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1151 | out: |
1152 | if (orig_node) | |
5d967310 | 1153 | batadv_orig_node_put(orig_node); |
f3e0008f | 1154 | return ret; |
c6c8fea2 | 1155 | } |