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0046b040 | 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
c6c8fea2 | 18 | #include "routing.h" |
1e2c2a4f SE |
19 | #include "main.h" |
20 | ||
21 | #include <linux/atomic.h> | |
22 | #include <linux/byteorder/generic.h> | |
23 | #include <linux/compiler.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/etherdevice.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/jiffies.h> | |
a6ba0d34 | 28 | #include <linux/kref.h> |
1e2c2a4f SE |
29 | #include <linux/netdevice.h> |
30 | #include <linux/printk.h> | |
31 | #include <linux/rculist.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/skbuff.h> | |
34 | #include <linux/spinlock.h> | |
35 | #include <linux/stddef.h> | |
36 | ||
37 | #include "bitarray.h" | |
23721387 | 38 | #include "bridge_loop_avoidance.h" |
c384ea3e | 39 | #include "distributed-arp-table.h" |
610bfc6b | 40 | #include "fragmentation.h" |
1e2c2a4f SE |
41 | #include "hard-interface.h" |
42 | #include "icmp_socket.h" | |
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 | ||
3b55e442 | 390 | ethhdr = eth_hdr(skb); |
da6b8c20 SW |
391 | icmph = (struct batadv_icmp_header *)skb->data; |
392 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
393 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
394 | goto out; | |
395 | ||
8fdd0153 AQ |
396 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
397 | ethhdr->h_dest); | |
da6b8c20 | 398 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
399 | } |
400 | ||
401 | /* packet for me */ | |
da6b8c20 SW |
402 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
403 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
404 | |
405 | /* TTL exceeded */ | |
a40d9b07 | 406 | if (icmph->ttl < 2) |
63b01037 | 407 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 408 | |
c6c8fea2 | 409 | /* get routing information */ |
da6b8c20 | 410 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 411 | if (!orig_node) |
e1a5382f | 412 | goto out; |
c6c8fea2 | 413 | |
44524fcd | 414 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 415 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 416 | goto out; |
c6c8fea2 | 417 | |
da6b8c20 | 418 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 419 | |
44524fcd | 420 | /* decrement ttl */ |
a40d9b07 | 421 | icmph->ttl--; |
44524fcd ML |
422 | |
423 | /* route it */ | |
f50ca95a AQ |
424 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
425 | if (res != -1) | |
bb351ba0 | 426 | ret = NET_RX_SUCCESS; |
c6c8fea2 | 427 | |
44524fcd | 428 | out: |
44524fcd | 429 | if (orig_node) |
5d967310 | 430 | batadv_orig_node_put(orig_node); |
c6c8fea2 SE |
431 | return ret; |
432 | } | |
433 | ||
f86ce0ad MH |
434 | /** |
435 | * batadv_check_unicast_packet - Check for malformed unicast packets | |
6e0895c2 | 436 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
437 | * @skb: packet to check |
438 | * @hdr_size: size of header to pull | |
439 | * | |
62fe710f SE |
440 | * Check for short header and bad addresses in given packet. |
441 | * | |
442 | * Return: negative value when check fails and 0 otherwise. The negative value | |
443 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
444 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 445 | */ |
fe8a93b9 AQ |
446 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
447 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
448 | { |
449 | struct ethhdr *ethhdr; | |
450 | ||
451 | /* drop packet if it has not necessary minimum size */ | |
452 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 453 | return -ENODATA; |
ff51fd70 | 454 | |
7ed4be95 | 455 | ethhdr = eth_hdr(skb); |
ff51fd70 MH |
456 | |
457 | /* packet with unicast indication but broadcast recipient */ | |
458 | if (is_broadcast_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 459 | return -EBADR; |
ff51fd70 MH |
460 | |
461 | /* packet with broadcast sender address */ | |
462 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 463 | return -EBADR; |
ff51fd70 MH |
464 | |
465 | /* not for me */ | |
fe8a93b9 | 466 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 467 | return -EREMOTE; |
ff51fd70 MH |
468 | |
469 | return 0; | |
470 | } | |
471 | ||
15c2ed75 SE |
472 | /** |
473 | * batadv_last_bonding_replace - Replace last_bonding_candidate of orig_node | |
474 | * @orig_node: originator node whose bonding candidates should be replaced | |
475 | * @new_candidate: new bonding candidate or NULL | |
476 | */ | |
477 | static void | |
478 | batadv_last_bonding_replace(struct batadv_orig_node *orig_node, | |
479 | struct batadv_orig_ifinfo *new_candidate) | |
480 | { | |
481 | struct batadv_orig_ifinfo *old_candidate; | |
482 | ||
483 | spin_lock_bh(&orig_node->neigh_list_lock); | |
484 | old_candidate = orig_node->last_bonding_candidate; | |
485 | ||
486 | if (new_candidate) | |
487 | kref_get(&new_candidate->refcount); | |
488 | orig_node->last_bonding_candidate = new_candidate; | |
489 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
490 | ||
491 | if (old_candidate) | |
492 | batadv_orig_ifinfo_put(old_candidate); | |
493 | } | |
494 | ||
f6c8b711 SW |
495 | /** |
496 | * batadv_find_router - find a suitable router for this originator | |
497 | * @bat_priv: the bat priv with all the soft interface information | |
498 | * @orig_node: the destination node | |
499 | * @recv_if: pointer to interface this packet was received on | |
500 | * | |
62fe710f | 501 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 502 | * this interface, or NULL if not available. |
9cfc7bd6 | 503 | */ |
56303d34 SE |
504 | struct batadv_neigh_node * |
505 | batadv_find_router(struct batadv_priv *bat_priv, | |
506 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 507 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 508 | { |
29824a55 | 509 | struct batadv_algo_ops *bao = bat_priv->algo_ops; |
f3b3d901 SW |
510 | struct batadv_neigh_node *first_candidate_router = NULL; |
511 | struct batadv_neigh_node *next_candidate_router = NULL; | |
512 | struct batadv_neigh_node *router, *cand_router = NULL; | |
513 | struct batadv_neigh_node *last_cand_router = NULL; | |
514 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
515 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
516 | struct batadv_orig_ifinfo *last_candidate; | |
517 | bool last_candidate_found = false; | |
c6c8fea2 SE |
518 | |
519 | if (!orig_node) | |
520 | return NULL; | |
521 | ||
7351a482 | 522 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 523 | |
329887ad SW |
524 | if (!router) |
525 | return router; | |
526 | ||
f3b3d901 SW |
527 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
528 | * and if activated. | |
529 | */ | |
329887ad | 530 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
531 | return router; |
532 | ||
533 | /* bonding: loop through the list of possible routers found | |
534 | * for the various outgoing interfaces and find a candidate after | |
535 | * the last chosen bonding candidate (next_candidate). If no such | |
536 | * router is found, use the first candidate found (the previously | |
537 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 538 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
539 | * router - obviously there are no other candidates. |
540 | */ | |
541 | rcu_read_lock(); | |
542 | last_candidate = orig_node->last_bonding_candidate; | |
543 | if (last_candidate) | |
544 | last_cand_router = rcu_dereference(last_candidate->router); | |
545 | ||
546 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
547 | /* acquire some structures and references ... */ | |
a6ba0d34 | 548 | if (!kref_get_unless_zero(&cand->refcount)) |
f3b3d901 SW |
549 | continue; |
550 | ||
551 | cand_router = rcu_dereference(cand->router); | |
552 | if (!cand_router) | |
553 | goto next; | |
554 | ||
77ae32e8 | 555 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
f3b3d901 SW |
556 | cand_router = NULL; |
557 | goto next; | |
558 | } | |
559 | ||
560 | /* alternative candidate should be good enough to be | |
561 | * considered | |
562 | */ | |
29824a55 AQ |
563 | if (!bao->neigh.is_similar_or_better(cand_router, |
564 | cand->if_outgoing, router, | |
565 | recv_if)) | |
f3b3d901 SW |
566 | goto next; |
567 | ||
568 | /* don't use the same router twice */ | |
569 | if (last_cand_router == cand_router) | |
570 | goto next; | |
571 | ||
572 | /* mark the first possible candidate */ | |
573 | if (!first_candidate) { | |
77ae32e8 | 574 | kref_get(&cand_router->refcount); |
a6ba0d34 | 575 | kref_get(&cand->refcount); |
f3b3d901 SW |
576 | first_candidate = cand; |
577 | first_candidate_router = cand_router; | |
578 | } | |
579 | ||
580 | /* check if the loop has already passed the previously selected | |
581 | * candidate ... this function should select the next candidate | |
582 | * AFTER the previously used bonding candidate. | |
583 | */ | |
584 | if (!last_candidate || last_candidate_found) { | |
585 | next_candidate = cand; | |
586 | next_candidate_router = cand_router; | |
587 | break; | |
588 | } | |
589 | ||
590 | if (last_candidate == cand) | |
591 | last_candidate_found = true; | |
592 | next: | |
593 | /* free references */ | |
594 | if (cand_router) { | |
25bb2509 | 595 | batadv_neigh_node_put(cand_router); |
f3b3d901 SW |
596 | cand_router = NULL; |
597 | } | |
35f94779 | 598 | batadv_orig_ifinfo_put(cand); |
f3b3d901 SW |
599 | } |
600 | rcu_read_unlock(); | |
601 | ||
f3b3d901 SW |
602 | /* After finding candidates, handle the three cases: |
603 | * 1) there is a next candidate, use that | |
604 | * 2) there is no next candidate, use the first of the list | |
605 | * 3) there is no candidate at all, return the default router | |
606 | */ | |
607 | if (next_candidate) { | |
25bb2509 | 608 | batadv_neigh_node_put(router); |
f3b3d901 | 609 | |
15c2ed75 | 610 | kref_get(&next_candidate_router->refcount); |
f3b3d901 | 611 | router = next_candidate_router; |
15c2ed75 | 612 | batadv_last_bonding_replace(orig_node, next_candidate); |
f3b3d901 | 613 | } else if (first_candidate) { |
25bb2509 | 614 | batadv_neigh_node_put(router); |
f3b3d901 | 615 | |
15c2ed75 | 616 | kref_get(&first_candidate_router->refcount); |
f3b3d901 | 617 | router = first_candidate_router; |
15c2ed75 | 618 | batadv_last_bonding_replace(orig_node, first_candidate); |
f3b3d901 | 619 | } else { |
15c2ed75 SE |
620 | batadv_last_bonding_replace(orig_node, NULL); |
621 | } | |
622 | ||
623 | /* cleanup of candidates */ | |
624 | if (first_candidate) { | |
625 | batadv_neigh_node_put(first_candidate_router); | |
626 | batadv_orig_ifinfo_put(first_candidate); | |
627 | } | |
628 | ||
629 | if (next_candidate) { | |
630 | batadv_neigh_node_put(next_candidate_router); | |
631 | batadv_orig_ifinfo_put(next_candidate); | |
f3b3d901 | 632 | } |
f6c8b711 | 633 | |
c6c8fea2 SE |
634 | return router; |
635 | } | |
636 | ||
63b01037 | 637 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 638 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 639 | { |
56303d34 SE |
640 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
641 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 642 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 643 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 644 | int res, hdr_len, ret = NET_RX_DROP; |
63d443ef | 645 | unsigned int len; |
c6c8fea2 | 646 | |
96412690 | 647 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
648 | |
649 | /* TTL exceeded */ | |
a40d9b07 | 650 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
651 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
652 | ethhdr->h_source, unicast_packet->dest); | |
44524fcd | 653 | goto out; |
c6c8fea2 SE |
654 | } |
655 | ||
656 | /* get routing information */ | |
da641193 | 657 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 658 | |
44524fcd | 659 | if (!orig_node) |
b5a6f69c | 660 | goto out; |
c6c8fea2 | 661 | |
c6c8fea2 | 662 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 663 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 664 | goto out; |
c6c8fea2 | 665 | |
c6c8fea2 | 666 | /* decrement ttl */ |
f097e25d | 667 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 668 | unicast_packet->ttl--; |
c6c8fea2 | 669 | |
a40d9b07 | 670 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
671 | case BATADV_UNICAST_4ADDR: |
672 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
673 | break; | |
674 | case BATADV_UNICAST: | |
675 | hdr_len = sizeof(struct batadv_unicast_packet); | |
676 | break; | |
677 | default: | |
678 | /* other packet types not supported - yet */ | |
679 | hdr_len = -1; | |
680 | break; | |
681 | } | |
682 | ||
683 | if (hdr_len > 0) | |
684 | batadv_skb_set_priority(skb, hdr_len); | |
685 | ||
63d443ef | 686 | len = skb->len; |
e91ecfc6 | 687 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
f50ca95a AQ |
688 | if (res == -1) |
689 | goto out; | |
95332477 | 690 | |
e91ecfc6 MH |
691 | /* translate transmit result into receive result */ |
692 | if (res == NET_XMIT_SUCCESS) { | |
693 | /* skb was transmitted and consumed */ | |
95332477 MH |
694 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
695 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
63d443ef | 696 | len + ETH_HLEN); |
95332477 | 697 | } |
c6c8fea2 | 698 | |
f50ca95a AQ |
699 | ret = NET_RX_SUCCESS; |
700 | ||
44524fcd | 701 | out: |
44524fcd | 702 | if (orig_node) |
5d967310 | 703 | batadv_orig_node_put(orig_node); |
44524fcd | 704 | return ret; |
c6c8fea2 SE |
705 | } |
706 | ||
7c1fd91d AQ |
707 | /** |
708 | * batadv_reroute_unicast_packet - update the unicast header for re-routing | |
709 | * @bat_priv: the bat priv with all the soft interface information | |
710 | * @unicast_packet: the unicast header to be updated | |
711 | * @dst_addr: the payload destination | |
c018ad3d | 712 | * @vid: VLAN identifier |
7c1fd91d AQ |
713 | * |
714 | * Search the translation table for dst_addr and update the unicast header with | |
715 | * the new corresponding information (originator address where the destination | |
716 | * client currently is and its known TTVN) | |
717 | * | |
62fe710f | 718 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
719 | */ |
720 | static bool | |
721 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, | |
722 | struct batadv_unicast_packet *unicast_packet, | |
6b5e971a | 723 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
724 | { |
725 | struct batadv_orig_node *orig_node = NULL; | |
726 | struct batadv_hard_iface *primary_if = NULL; | |
727 | bool ret = false; | |
6b5e971a | 728 | u8 *orig_addr, orig_ttvn; |
7c1fd91d | 729 | |
c018ad3d | 730 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
731 | primary_if = batadv_primary_if_get_selected(bat_priv); |
732 | if (!primary_if) | |
733 | goto out; | |
734 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 735 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 736 | } else { |
c018ad3d AQ |
737 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
738 | vid); | |
7c1fd91d AQ |
739 | if (!orig_node) |
740 | goto out; | |
741 | ||
742 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
743 | goto out; | |
744 | ||
745 | orig_addr = orig_node->orig; | |
6b5e971a | 746 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
747 | } |
748 | ||
749 | /* update the packet header */ | |
8fdd0153 | 750 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d AQ |
751 | unicast_packet->ttvn = orig_ttvn; |
752 | ||
753 | ret = true; | |
754 | out: | |
755 | if (primary_if) | |
82047ad7 | 756 | batadv_hardif_put(primary_if); |
7c1fd91d | 757 | if (orig_node) |
5d967310 | 758 | batadv_orig_node_put(orig_node); |
7c1fd91d AQ |
759 | |
760 | return ret; | |
761 | } | |
762 | ||
4b426b10 SE |
763 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
764 | struct sk_buff *skb, int hdr_len) | |
765 | { | |
c018ad3d AQ |
766 | struct batadv_unicast_packet *unicast_packet; |
767 | struct batadv_hard_iface *primary_if; | |
56303d34 | 768 | struct batadv_orig_node *orig_node; |
6b5e971a | 769 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 770 | struct ethhdr *ethhdr; |
c018ad3d | 771 | unsigned short vid; |
3e34819e | 772 | int is_old_ttvn; |
a73105b8 | 773 | |
b8fcfa42 | 774 | /* check if there is enough data before accessing it */ |
f1791425 | 775 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
4b426b10 | 776 | return false; |
b8fcfa42 AQ |
777 | |
778 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
779 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
4b426b10 | 780 | return false; |
a73105b8 | 781 | |
96412690 | 782 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 783 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 784 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 785 | |
7c1fd91d AQ |
786 | /* check if the destination client was served by this node and it is now |
787 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
788 | * message and that it knows the new destination in the mesh to re-route | |
789 | * the packet to | |
790 | */ | |
c018ad3d | 791 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
7c1fd91d | 792 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, |
c018ad3d | 793 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
794 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
795 | bat_priv, | |
796 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
797 | unicast_packet->dest, | |
798 | ethhdr->h_dest); | |
7c1fd91d AQ |
799 | /* at this point the mesh destination should have been |
800 | * substituted with the originator address found in the global | |
801 | * table. If not, let the packet go untouched anyway because | |
802 | * there is nothing the node can do | |
803 | */ | |
4b426b10 | 804 | return true; |
7c1fd91d AQ |
805 | } |
806 | ||
807 | /* retrieve the TTVN known by this node for the packet destination. This | |
808 | * value is used later to check if the node which sent (or re-routed | |
809 | * last time) the packet had an updated information or not | |
810 | */ | |
6b5e971a | 811 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 812 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
813 | orig_node = batadv_orig_hash_find(bat_priv, |
814 | unicast_packet->dest); | |
7c1fd91d AQ |
815 | /* if it is not possible to find the orig_node representing the |
816 | * destination, the packet can immediately be dropped as it will | |
817 | * not be possible to deliver it | |
818 | */ | |
a73105b8 | 819 | if (!orig_node) |
4b426b10 | 820 | return false; |
a73105b8 | 821 | |
6b5e971a | 822 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
5d967310 | 823 | batadv_orig_node_put(orig_node); |
a73105b8 AQ |
824 | } |
825 | ||
7c1fd91d AQ |
826 | /* check if the TTVN contained in the packet is fresher than what the |
827 | * node knows | |
828 | */ | |
3e34819e | 829 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d | 830 | if (!is_old_ttvn) |
4b426b10 | 831 | return true; |
a73105b8 | 832 | |
7c1fd91d AQ |
833 | old_ttvn = unicast_packet->ttvn; |
834 | /* the packet was forged based on outdated network information. Its | |
835 | * destination can possibly be updated and forwarded towards the new | |
836 | * target host | |
837 | */ | |
838 | if (batadv_reroute_unicast_packet(bat_priv, unicast_packet, | |
c018ad3d | 839 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
840 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
841 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
842 | unicast_packet->dest, ethhdr->h_dest, | |
843 | old_ttvn, curr_ttvn); | |
4b426b10 | 844 | return true; |
7c1fd91d | 845 | } |
3275e7cc | 846 | |
7c1fd91d AQ |
847 | /* the packet has not been re-routed: either the destination is |
848 | * currently served by this node or there is no destination at all and | |
849 | * it is possible to drop the packet | |
850 | */ | |
c018ad3d | 851 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
4b426b10 | 852 | return false; |
3275e7cc | 853 | |
7c1fd91d AQ |
854 | /* update the header in order to let the packet be delivered to this |
855 | * node's soft interface | |
856 | */ | |
857 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
858 | if (!primary_if) | |
4b426b10 | 859 | return false; |
a73105b8 | 860 | |
8fdd0153 | 861 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
7c1fd91d | 862 | |
82047ad7 | 863 | batadv_hardif_put(primary_if); |
7c1fd91d AQ |
864 | |
865 | unicast_packet->ttvn = curr_ttvn; | |
a73105b8 | 866 | |
4b426b10 | 867 | return true; |
a73105b8 AQ |
868 | } |
869 | ||
a1f1ac5c SW |
870 | /** |
871 | * batadv_recv_unhandled_unicast_packet - receive and process packets which | |
872 | * are in the unicast number space but not yet known to the implementation | |
873 | * @skb: unicast tvlv packet to process | |
874 | * @recv_if: pointer to interface this packet was received on | |
875 | * | |
62fe710f | 876 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
877 | * otherwise. |
878 | */ | |
879 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
880 | struct batadv_hard_iface *recv_if) | |
881 | { | |
882 | struct batadv_unicast_packet *unicast_packet; | |
883 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
884 | int check, hdr_size = sizeof(*unicast_packet); | |
885 | ||
886 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
887 | if (check < 0) | |
888 | return NET_RX_DROP; | |
889 | ||
890 | /* we don't know about this type, drop it. */ | |
891 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
892 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
893 | return NET_RX_DROP; | |
894 | ||
895 | return batadv_route_unicast_packet(skb, recv_if); | |
896 | } | |
897 | ||
56303d34 SE |
898 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
899 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 900 | { |
56303d34 | 901 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 902 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 903 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
6b5e971a | 904 | u8 *orig_addr; |
9affec6b | 905 | struct batadv_orig_node *orig_node = NULL; |
612d2b4f | 906 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 907 | enum batadv_subtype subtype; |
c384ea3e | 908 | bool is4addr; |
c6c8fea2 | 909 | |
7cdcf6dd | 910 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
4046b24a | 911 | unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; |
7cdcf6dd | 912 | |
a40d9b07 | 913 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 914 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 915 | if (is4addr) |
4046b24a | 916 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 917 | |
612d2b4f | 918 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 919 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
920 | |
921 | /* Even though the packet is not for us, we might save it to use for | |
922 | * decoding a later received coded packet | |
923 | */ | |
924 | if (check == -EREMOTE) | |
925 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
926 | ||
927 | if (check < 0) | |
c6c8fea2 | 928 | return NET_RX_DROP; |
dd981ab0 | 929 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
a73105b8 AQ |
930 | return NET_RX_DROP; |
931 | ||
c6c8fea2 | 932 | /* packet for me */ |
fe8a93b9 | 933 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9affec6b | 934 | if (is4addr) { |
437bb0e6 SW |
935 | subtype = unicast_4addr_packet->subtype; |
936 | batadv_dat_inc_counter(bat_priv, subtype); | |
937 | ||
938 | /* Only payload data should be considered for speedy | |
939 | * join. For example, DAT also uses unicast 4addr | |
940 | * types, but those packets should not be considered | |
941 | * for speedy join, since the clients do not actually | |
942 | * reside at the sending originator. | |
943 | */ | |
944 | if (subtype == BATADV_P_DATA) { | |
945 | orig_addr = unicast_4addr_packet->src; | |
946 | orig_node = batadv_orig_hash_find(bat_priv, | |
947 | orig_addr); | |
948 | } | |
9affec6b | 949 | } |
4046b24a | 950 | |
c384ea3e AQ |
951 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
952 | hdr_size)) | |
953 | goto rx_success; | |
954 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
955 | hdr_size)) | |
956 | goto rx_success; | |
957 | ||
6535db56 | 958 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
9affec6b | 959 | orig_node); |
37135173 | 960 | |
c384ea3e | 961 | rx_success: |
9affec6b | 962 | if (orig_node) |
5d967310 | 963 | batadv_orig_node_put(orig_node); |
9affec6b | 964 | |
c6c8fea2 SE |
965 | return NET_RX_SUCCESS; |
966 | } | |
967 | ||
63b01037 | 968 | return batadv_route_unicast_packet(skb, recv_if); |
c6c8fea2 SE |
969 | } |
970 | ||
ef261577 ML |
971 | /** |
972 | * batadv_recv_unicast_tvlv - receive and process unicast tvlv packets | |
973 | * @skb: unicast tvlv packet to process | |
974 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 975 | * |
62fe710f | 976 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
977 | * otherwise. |
978 | */ | |
979 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
980 | struct batadv_hard_iface *recv_if) | |
981 | { | |
982 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
983 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
984 | unsigned char *tvlv_buff; | |
6b5e971a | 985 | u16 tvlv_buff_len; |
ef261577 ML |
986 | int hdr_size = sizeof(*unicast_tvlv_packet); |
987 | int ret = NET_RX_DROP; | |
988 | ||
989 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
990 | return NET_RX_DROP; | |
991 | ||
992 | /* the header is likely to be modified while forwarding */ | |
993 | if (skb_cow(skb, hdr_size) < 0) | |
994 | return NET_RX_DROP; | |
995 | ||
996 | /* packet needs to be linearized to access the tvlv content */ | |
997 | if (skb_linearize(skb) < 0) | |
998 | return NET_RX_DROP; | |
999 | ||
1000 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1001 | ||
1002 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1003 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1004 | ||
1005 | if (tvlv_buff_len > skb->len - hdr_size) | |
1006 | return NET_RX_DROP; | |
1007 | ||
1008 | ret = batadv_tvlv_containers_process(bat_priv, false, NULL, | |
1009 | unicast_tvlv_packet->src, | |
1010 | unicast_tvlv_packet->dst, | |
1011 | tvlv_buff, tvlv_buff_len); | |
1012 | ||
1013 | if (ret != NET_RX_SUCCESS) | |
1014 | ret = batadv_route_unicast_packet(skb, recv_if); | |
05c3c8a6 AQ |
1015 | else |
1016 | consume_skb(skb); | |
ef261577 ML |
1017 | |
1018 | return ret; | |
1019 | } | |
c6c8fea2 | 1020 | |
610bfc6b MH |
1021 | /** |
1022 | * batadv_recv_frag_packet - process received fragment | |
1023 | * @skb: the received fragment | |
1024 | * @recv_if: interface that the skb is received on | |
1025 | * | |
1026 | * This function does one of the three following things: 1) Forward fragment, if | |
1027 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we till | |
1028 | * lack further fragments; 3) Merge fragments, if we have all needed parts. | |
1029 | * | |
62fe710f | 1030 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
1031 | */ |
1032 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1033 | struct batadv_hard_iface *recv_if) | |
1034 | { | |
1035 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1036 | struct batadv_orig_node *orig_node_src = NULL; | |
1037 | struct batadv_frag_packet *frag_packet; | |
1038 | int ret = NET_RX_DROP; | |
1039 | ||
1040 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1041 | sizeof(*frag_packet)) < 0) | |
1042 | goto out; | |
1043 | ||
1044 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1045 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1046 | if (!orig_node_src) | |
1047 | goto out; | |
1048 | ||
c0f25c80 AL |
1049 | skb->priority = frag_packet->priority + 256; |
1050 | ||
610bfc6b MH |
1051 | /* Route the fragment if it is not for us and too big to be merged. */ |
1052 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1053 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
1054 | ret = NET_RX_SUCCESS; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1059 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1060 | ||
1061 | /* Add fragment to buffer and merge if possible. */ | |
1062 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
1063 | goto out; | |
1064 | ||
1065 | /* Deliver merged packet to the appropriate handler, if it was | |
1066 | * merged | |
1067 | */ | |
1068 | if (skb) | |
1069 | batadv_batman_skb_recv(skb, recv_if->net_dev, | |
1070 | &recv_if->batman_adv_ptype, NULL); | |
1071 | ||
1072 | ret = NET_RX_SUCCESS; | |
1073 | ||
1074 | out: | |
1075 | if (orig_node_src) | |
5d967310 | 1076 | batadv_orig_node_put(orig_node_src); |
610bfc6b MH |
1077 | |
1078 | return ret; | |
1079 | } | |
1080 | ||
56303d34 SE |
1081 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1082 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1083 | { |
56303d34 SE |
1084 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1085 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1086 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1087 | struct ethhdr *ethhdr; |
704509b8 | 1088 | int hdr_size = sizeof(*bcast_packet); |
f3e0008f | 1089 | int ret = NET_RX_DROP; |
6b5e971a SE |
1090 | s32 seq_diff; |
1091 | u32 seqno; | |
c6c8fea2 SE |
1092 | |
1093 | /* drop packet if it has not necessary minimum size */ | |
1094 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f3e0008f | 1095 | goto out; |
c6c8fea2 | 1096 | |
7ed4be95 | 1097 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1098 | |
1099 | /* packet with broadcast indication but unicast recipient */ | |
1100 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
f3e0008f | 1101 | goto out; |
c6c8fea2 SE |
1102 | |
1103 | /* packet with broadcast sender address */ | |
1104 | if (is_broadcast_ether_addr(ethhdr->h_source)) | |
f3e0008f | 1105 | goto out; |
c6c8fea2 SE |
1106 | |
1107 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1108 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
f3e0008f | 1109 | goto out; |
c6c8fea2 | 1110 | |
96412690 | 1111 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1112 | |
1113 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1114 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
f3e0008f | 1115 | goto out; |
c6c8fea2 | 1116 | |
a40d9b07 | 1117 | if (bcast_packet->ttl < 2) |
f3e0008f | 1118 | goto out; |
c6c8fea2 | 1119 | |
da641193 | 1120 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1121 | |
1122 | if (!orig_node) | |
b5a6f69c | 1123 | goto out; |
c6c8fea2 | 1124 | |
f3e0008f | 1125 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1126 | |
3fba7325 | 1127 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1128 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1129 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1130 | seqno)) |
f3e0008f | 1131 | goto spin_unlock; |
c6c8fea2 | 1132 | |
3fba7325 | 1133 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1134 | |
1135 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 | 1136 | if (batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1137 | BATADV_BCAST_MAX_AGE, |
1138 | &orig_node->bcast_seqno_reset, NULL)) | |
f3e0008f | 1139 | goto spin_unlock; |
c6c8fea2 SE |
1140 | |
1141 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1142 | * if required. |
1143 | */ | |
0f5f9322 | 1144 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1145 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1146 | |
f3e0008f | 1147 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1148 | |
fe2da6ff | 1149 | /* check whether this has been sent by another originator before */ |
004e86fc | 1150 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
fe2da6ff SW |
1151 | goto out; |
1152 | ||
c54f38c9 SW |
1153 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1154 | ||
c6c8fea2 | 1155 | /* rebroadcast packet */ |
9455e34c | 1156 | batadv_add_bcast_packet_to_list(bat_priv, skb, 1); |
c6c8fea2 | 1157 | |
23721387 SW |
1158 | /* don't hand the broadcast up if it is from an originator |
1159 | * from the same backbone. | |
1160 | */ | |
08adf151 | 1161 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
23721387 SW |
1162 | goto out; |
1163 | ||
c384ea3e AQ |
1164 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1165 | goto rx_success; | |
1166 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1167 | goto rx_success; | |
1168 | ||
c6c8fea2 | 1169 | /* broadcast for me */ |
6535db56 | 1170 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
c384ea3e AQ |
1171 | |
1172 | rx_success: | |
f3e0008f ML |
1173 | ret = NET_RX_SUCCESS; |
1174 | goto out; | |
c6c8fea2 | 1175 | |
f3e0008f ML |
1176 | spin_unlock: |
1177 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
f3e0008f ML |
1178 | out: |
1179 | if (orig_node) | |
5d967310 | 1180 | batadv_orig_node_put(orig_node); |
f3e0008f | 1181 | return ret; |
c6c8fea2 | 1182 | } |