Commit | Line | Data |
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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
cfa55c6d | 2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
3 | * |
4 | * Marek Lindner, Simon Wunderlich | |
c6c8fea2 SE |
5 | */ |
6 | ||
c6c8fea2 | 7 | #include "routing.h" |
1e2c2a4f SE |
8 | #include "main.h" |
9 | ||
10 | #include <linux/atomic.h> | |
11 | #include <linux/byteorder/generic.h> | |
12 | #include <linux/compiler.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/if_ether.h> | |
16 | #include <linux/jiffies.h> | |
a6ba0d34 | 17 | #include <linux/kref.h> |
1e2c2a4f SE |
18 | #include <linux/netdevice.h> |
19 | #include <linux/printk.h> | |
20 | #include <linux/rculist.h> | |
21 | #include <linux/rcupdate.h> | |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/stddef.h> | |
fec149f5 | 25 | #include <uapi/linux/batadv_packet.h> |
1e2c2a4f SE |
26 | |
27 | #include "bitarray.h" | |
23721387 | 28 | #include "bridge_loop_avoidance.h" |
c384ea3e | 29 | #include "distributed-arp-table.h" |
610bfc6b | 30 | #include "fragmentation.h" |
1e2c2a4f | 31 | #include "hard-interface.h" |
ba412080 | 32 | #include "log.h" |
1e2c2a4f SE |
33 | #include "network-coding.h" |
34 | #include "originator.h" | |
1e2c2a4f SE |
35 | #include "send.h" |
36 | #include "soft-interface.h" | |
33a3bb4a | 37 | #include "tp_meter.h" |
1e2c2a4f | 38 | #include "translation-table.h" |
1f8dce49 | 39 | #include "tvlv.h" |
c018ad3d | 40 | |
63b01037 | 41 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 42 | struct batadv_hard_iface *recv_if); |
a7f6ee94 | 43 | |
7351a482 | 44 | /** |
7e9a8c2c | 45 | * _batadv_update_route() - set the router for this originator |
7351a482 SW |
46 | * @bat_priv: the bat priv with all the soft interface information |
47 | * @orig_node: orig node which is to be configured | |
48 | * @recv_if: the receive interface for which this route is set | |
49 | * @neigh_node: neighbor which should be the next router | |
50 | * | |
51 | * This function does not perform any error checks | |
52 | */ | |
56303d34 SE |
53 | static void _batadv_update_route(struct batadv_priv *bat_priv, |
54 | struct batadv_orig_node *orig_node, | |
7351a482 | 55 | struct batadv_hard_iface *recv_if, |
56303d34 | 56 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 57 | { |
7351a482 | 58 | struct batadv_orig_ifinfo *orig_ifinfo; |
56303d34 | 59 | struct batadv_neigh_node *curr_router; |
e1a5382f | 60 | |
7351a482 SW |
61 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, recv_if); |
62 | if (!orig_ifinfo) | |
63 | return; | |
64 | ||
b5dcbad2 SE |
65 | spin_lock_bh(&orig_node->neigh_list_lock); |
66 | /* curr_router used earlier may not be the current orig_ifinfo->router | |
67 | * anymore because it was dereferenced outside of the neigh_list_lock | |
68 | * protected region. After the new best neighbor has replace the current | |
69 | * best neighbor the reference counter needs to decrease. Consequently, | |
70 | * the code needs to ensure the curr_router variable contains a pointer | |
71 | * to the replaced best neighbor. | |
72 | */ | |
b5dcbad2 SE |
73 | |
74 | /* increase refcount of new best neighbor */ | |
75 | if (neigh_node) | |
76 | kref_get(&neigh_node->refcount); | |
77 | ||
cf78bb0b AQ |
78 | curr_router = rcu_replace_pointer(orig_ifinfo->router, neigh_node, |
79 | true); | |
b5dcbad2 SE |
80 | spin_unlock_bh(&orig_node->neigh_list_lock); |
81 | batadv_orig_ifinfo_put(orig_ifinfo); | |
a8e7f4bc | 82 | |
c6c8fea2 | 83 | /* route deleted */ |
825ffe1f | 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 | 90 | /* route added */ |
825ffe1f | 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 | /* decrease refcount of previous best neighbor */ |
79a0bffb | 104 | batadv_neigh_node_put(curr_router); |
c6c8fea2 SE |
105 | } |
106 | ||
7351a482 | 107 | /** |
7e9a8c2c | 108 | * batadv_update_route() - set the router for this originator |
7351a482 SW |
109 | * @bat_priv: the bat priv with all the soft interface information |
110 | * @orig_node: orig node which is to be configured | |
111 | * @recv_if: the receive interface for which this route is set | |
112 | * @neigh_node: neighbor which should be the next router | |
113 | */ | |
56303d34 SE |
114 | void batadv_update_route(struct batadv_priv *bat_priv, |
115 | struct batadv_orig_node *orig_node, | |
7351a482 | 116 | struct batadv_hard_iface *recv_if, |
56303d34 | 117 | struct batadv_neigh_node *neigh_node) |
c6c8fea2 | 118 | { |
56303d34 | 119 | struct batadv_neigh_node *router = NULL; |
c6c8fea2 SE |
120 | |
121 | if (!orig_node) | |
e1a5382f LL |
122 | goto out; |
123 | ||
7351a482 | 124 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 125 | |
e1a5382f | 126 | if (router != neigh_node) |
7351a482 | 127 | _batadv_update_route(bat_priv, orig_node, recv_if, neigh_node); |
e1a5382f LL |
128 | |
129 | out: | |
79a0bffb | 130 | batadv_neigh_node_put(router); |
c6c8fea2 SE |
131 | } |
132 | ||
62fe710f | 133 | /** |
7e9a8c2c | 134 | * batadv_window_protected() - checks whether the host restarted and is in the |
62fe710f | 135 | * protection time. |
7afcbbef SE |
136 | * @bat_priv: the bat priv with all the soft interface information |
137 | * @seq_num_diff: difference between the current/received sequence number and | |
138 | * the last sequence number | |
81f02683 | 139 | * @seq_old_max_diff: maximum age of sequence number not considered as restart |
7afcbbef SE |
140 | * @last_reset: jiffies timestamp of the last reset, will be updated when reset |
141 | * is detected | |
81f02683 SW |
142 | * @protection_started: is set to true if the protection window was started, |
143 | * doesn't change otherwise. | |
62fe710f SE |
144 | * |
145 | * Return: | |
4b426b10 SE |
146 | * false if the packet is to be accepted. |
147 | * true if the packet is to be ignored. | |
c6c8fea2 | 148 | */ |
4b426b10 SE |
149 | bool batadv_window_protected(struct batadv_priv *bat_priv, s32 seq_num_diff, |
150 | s32 seq_old_max_diff, unsigned long *last_reset, | |
151 | bool *protection_started) | |
c6c8fea2 | 152 | { |
81f02683 | 153 | if (seq_num_diff <= -seq_old_max_diff || |
42d0b044 SE |
154 | seq_num_diff >= BATADV_EXPECTED_SEQNO_RANGE) { |
155 | if (!batadv_has_timed_out(*last_reset, | |
156 | BATADV_RESET_PROTECTION_MS)) | |
4b426b10 | 157 | return true; |
8c7bf248 ML |
158 | |
159 | *last_reset = jiffies; | |
81f02683 SW |
160 | if (protection_started) |
161 | *protection_started = true; | |
39c75a51 | 162 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf | 163 | "old packet received, start protection\n"); |
c6c8fea2 | 164 | } |
8c7bf248 | 165 | |
4b426b10 | 166 | return false; |
c6c8fea2 SE |
167 | } |
168 | ||
ff15c27c SE |
169 | /** |
170 | * batadv_check_management_packet() - Check preconditions for management packets | |
171 | * @skb: incoming packet buffer | |
172 | * @hard_iface: incoming hard interface | |
173 | * @header_len: minimal header length of packet type | |
174 | * | |
175 | * Return: true when management preconditions are met, false otherwise | |
176 | */ | |
30d3c511 | 177 | bool batadv_check_management_packet(struct sk_buff *skb, |
56303d34 | 178 | struct batadv_hard_iface *hard_iface, |
30d3c511 | 179 | int header_len) |
c6c8fea2 | 180 | { |
c6c8fea2 SE |
181 | struct ethhdr *ethhdr; |
182 | ||
183 | /* drop packet if it has not necessary minimum size */ | |
c3e29312 ML |
184 | if (unlikely(!pskb_may_pull(skb, header_len))) |
185 | return false; | |
c6c8fea2 | 186 | |
7ed4be95 | 187 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
188 | |
189 | /* packet with broadcast indication but unicast recipient */ | |
190 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
c3e29312 | 191 | return false; |
c6c8fea2 | 192 | |
92eef520 SE |
193 | /* packet with invalid sender address */ |
194 | if (!is_valid_ether_addr(ethhdr->h_source)) | |
c3e29312 | 195 | return false; |
c6c8fea2 SE |
196 | |
197 | /* create a copy of the skb, if needed, to modify it. */ | |
198 | if (skb_cow(skb, 0) < 0) | |
c3e29312 | 199 | return false; |
c6c8fea2 SE |
200 | |
201 | /* keep skb linear */ | |
202 | if (skb_linearize(skb) < 0) | |
c3e29312 | 203 | return false; |
c6c8fea2 | 204 | |
c3e29312 | 205 | return true; |
c6c8fea2 SE |
206 | } |
207 | ||
da6b8c20 | 208 | /** |
7e9a8c2c | 209 | * batadv_recv_my_icmp_packet() - receive an icmp packet locally |
da6b8c20 SW |
210 | * @bat_priv: the bat priv with all the soft interface information |
211 | * @skb: icmp packet to process | |
212 | * | |
62fe710f | 213 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
da6b8c20 SW |
214 | * otherwise. |
215 | */ | |
56303d34 | 216 | static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, |
da6b8c20 | 217 | struct sk_buff *skb) |
c6c8fea2 | 218 | { |
56303d34 SE |
219 | struct batadv_hard_iface *primary_if = NULL; |
220 | struct batadv_orig_node *orig_node = NULL; | |
da6b8c20 SW |
221 | struct batadv_icmp_header *icmph; |
222 | int res, ret = NET_RX_DROP; | |
c6c8fea2 | 223 | |
da6b8c20 | 224 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 225 | |
da6b8c20 | 226 | switch (icmph->msg_type) { |
da6b8c20 SW |
227 | case BATADV_ECHO_REQUEST: |
228 | /* answer echo request (ping) */ | |
229 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
230 | if (!primary_if) | |
231 | goto out; | |
232 | ||
233 | /* get routing information */ | |
234 | orig_node = batadv_orig_hash_find(bat_priv, icmph->orig); | |
235 | if (!orig_node) | |
236 | goto out; | |
237 | ||
238 | /* create a copy of the skb, if needed, to modify it. */ | |
239 | if (skb_cow(skb, ETH_HLEN) < 0) | |
240 | goto out; | |
241 | ||
242 | icmph = (struct batadv_icmp_header *)skb->data; | |
243 | ||
8fdd0153 AQ |
244 | ether_addr_copy(icmph->dst, icmph->orig); |
245 | ether_addr_copy(icmph->orig, primary_if->net_dev->dev_addr); | |
da6b8c20 | 246 | icmph->msg_type = BATADV_ECHO_REPLY; |
a40d9b07 | 247 | icmph->ttl = BATADV_TTL; |
da6b8c20 SW |
248 | |
249 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); | |
b91a2543 SE |
250 | if (res == NET_XMIT_SUCCESS) |
251 | ret = NET_RX_SUCCESS; | |
da6b8c20 | 252 | |
b91a2543 SE |
253 | /* skb was consumed */ |
254 | skb = NULL; | |
da6b8c20 | 255 | break; |
33a3bb4a AQ |
256 | case BATADV_TP: |
257 | if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet))) | |
258 | goto out; | |
259 | ||
260 | batadv_tp_meter_recv(bat_priv, skb); | |
261 | ret = NET_RX_SUCCESS; | |
b91a2543 SE |
262 | /* skb was consumed */ |
263 | skb = NULL; | |
33a3bb4a | 264 | goto out; |
da6b8c20 SW |
265 | default: |
266 | /* drop unknown type */ | |
44524fcd | 267 | goto out; |
da6b8c20 | 268 | } |
44524fcd | 269 | out: |
79a0bffb SE |
270 | batadv_hardif_put(primary_if); |
271 | batadv_orig_node_put(orig_node); | |
b91a2543 SE |
272 | |
273 | kfree_skb(skb); | |
274 | ||
c6c8fea2 SE |
275 | return ret; |
276 | } | |
277 | ||
56303d34 | 278 | static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, |
63b01037 | 279 | struct sk_buff *skb) |
c6c8fea2 | 280 | { |
56303d34 SE |
281 | struct batadv_hard_iface *primary_if = NULL; |
282 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 283 | struct batadv_icmp_packet *icmp_packet; |
f50ca95a | 284 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 285 | |
96412690 | 286 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 SE |
287 | |
288 | /* send TTL exceeded if packet is an echo request (traceroute) */ | |
27a417e6 | 289 | if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { |
86ceb360 | 290 | pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", |
27a417e6 | 291 | icmp_packet->orig, icmp_packet->dst); |
44524fcd | 292 | goto out; |
c6c8fea2 SE |
293 | } |
294 | ||
e5d89254 | 295 | primary_if = batadv_primary_if_get_selected(bat_priv); |
32ae9b22 | 296 | if (!primary_if) |
44524fcd | 297 | goto out; |
c6c8fea2 SE |
298 | |
299 | /* get routing information */ | |
27a417e6 | 300 | orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); |
44524fcd | 301 | if (!orig_node) |
e1a5382f | 302 | goto out; |
c6c8fea2 | 303 | |
44524fcd | 304 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 305 | if (skb_cow(skb, ETH_HLEN) < 0) |
44524fcd | 306 | goto out; |
c6c8fea2 | 307 | |
96412690 | 308 | icmp_packet = (struct batadv_icmp_packet *)skb->data; |
c6c8fea2 | 309 | |
8fdd0153 AQ |
310 | ether_addr_copy(icmp_packet->dst, icmp_packet->orig); |
311 | ether_addr_copy(icmp_packet->orig, primary_if->net_dev->dev_addr); | |
27a417e6 AQ |
312 | icmp_packet->msg_type = BATADV_TTL_EXCEEDED; |
313 | icmp_packet->ttl = BATADV_TTL; | |
44524fcd | 314 | |
f50ca95a | 315 | res = batadv_send_skb_to_orig(skb, orig_node, NULL); |
b91a2543 SE |
316 | if (res == NET_RX_SUCCESS) |
317 | ret = NET_XMIT_SUCCESS; | |
318 | ||
319 | /* skb was consumed */ | |
320 | skb = NULL; | |
c6c8fea2 | 321 | |
44524fcd | 322 | out: |
79a0bffb SE |
323 | batadv_hardif_put(primary_if); |
324 | batadv_orig_node_put(orig_node); | |
b91a2543 SE |
325 | |
326 | kfree_skb(skb); | |
327 | ||
c6c8fea2 SE |
328 | return ret; |
329 | } | |
330 | ||
ff15c27c SE |
331 | /** |
332 | * batadv_recv_icmp_packet() - Process incoming icmp packet | |
333 | * @skb: incoming packet buffer | |
334 | * @recv_if: incoming hard interface | |
335 | * | |
336 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
337 | */ | |
56303d34 SE |
338 | int batadv_recv_icmp_packet(struct sk_buff *skb, |
339 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 340 | { |
56303d34 | 341 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
da6b8c20 SW |
342 | struct batadv_icmp_header *icmph; |
343 | struct batadv_icmp_packet_rr *icmp_packet_rr; | |
c6c8fea2 | 344 | struct ethhdr *ethhdr; |
56303d34 | 345 | struct batadv_orig_node *orig_node = NULL; |
da6b8c20 | 346 | int hdr_size = sizeof(struct batadv_icmp_header); |
f50ca95a | 347 | int res, ret = NET_RX_DROP; |
c6c8fea2 | 348 | |
c6c8fea2 SE |
349 | /* drop packet if it has not necessary minimum size */ |
350 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 351 | goto free_skb; |
c6c8fea2 | 352 | |
7ed4be95 | 353 | ethhdr = eth_hdr(skb); |
c6c8fea2 | 354 | |
93bbaab4 SE |
355 | /* packet with unicast indication but non-unicast recipient */ |
356 | if (!is_valid_ether_addr(ethhdr->h_dest)) | |
b91a2543 | 357 | goto free_skb; |
c6c8fea2 | 358 | |
9f75c8e1 SE |
359 | /* packet with broadcast/multicast sender address */ |
360 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
b91a2543 | 361 | goto free_skb; |
c6c8fea2 SE |
362 | |
363 | /* not for me */ | |
fe8a93b9 | 364 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
b91a2543 | 365 | goto free_skb; |
c6c8fea2 | 366 | |
da6b8c20 | 367 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 SE |
368 | |
369 | /* add record route information if not full */ | |
da6b8c20 SW |
370 | if ((icmph->msg_type == BATADV_ECHO_REPLY || |
371 | icmph->msg_type == BATADV_ECHO_REQUEST) && | |
825ffe1f | 372 | skb->len >= sizeof(struct batadv_icmp_packet_rr)) { |
da6b8c20 | 373 | if (skb_linearize(skb) < 0) |
b91a2543 | 374 | goto free_skb; |
da6b8c20 SW |
375 | |
376 | /* create a copy of the skb, if needed, to modify it. */ | |
377 | if (skb_cow(skb, ETH_HLEN) < 0) | |
b91a2543 | 378 | goto free_skb; |
da6b8c20 | 379 | |
3b55e442 | 380 | ethhdr = eth_hdr(skb); |
da6b8c20 SW |
381 | icmph = (struct batadv_icmp_header *)skb->data; |
382 | icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmph; | |
383 | if (icmp_packet_rr->rr_cur >= BATADV_RR_LEN) | |
b91a2543 | 384 | goto free_skb; |
da6b8c20 | 385 | |
8fdd0153 AQ |
386 | ether_addr_copy(icmp_packet_rr->rr[icmp_packet_rr->rr_cur], |
387 | ethhdr->h_dest); | |
da6b8c20 | 388 | icmp_packet_rr->rr_cur++; |
c6c8fea2 SE |
389 | } |
390 | ||
391 | /* packet for me */ | |
da6b8c20 SW |
392 | if (batadv_is_my_mac(bat_priv, icmph->dst)) |
393 | return batadv_recv_my_icmp_packet(bat_priv, skb); | |
c6c8fea2 SE |
394 | |
395 | /* TTL exceeded */ | |
a40d9b07 | 396 | if (icmph->ttl < 2) |
63b01037 | 397 | return batadv_recv_icmp_ttl_exceeded(bat_priv, skb); |
c6c8fea2 | 398 | |
c6c8fea2 | 399 | /* get routing information */ |
da6b8c20 | 400 | orig_node = batadv_orig_hash_find(bat_priv, icmph->dst); |
44524fcd | 401 | if (!orig_node) |
b91a2543 | 402 | goto free_skb; |
c6c8fea2 | 403 | |
44524fcd | 404 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 405 | if (skb_cow(skb, ETH_HLEN) < 0) |
b91a2543 | 406 | goto put_orig_node; |
c6c8fea2 | 407 | |
da6b8c20 | 408 | icmph = (struct batadv_icmp_header *)skb->data; |
c6c8fea2 | 409 | |
44524fcd | 410 | /* decrement ttl */ |
a40d9b07 | 411 | icmph->ttl--; |
44524fcd ML |
412 | |
413 | /* route it */ | |
f50ca95a | 414 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
b91a2543 SE |
415 | if (res == NET_XMIT_SUCCESS) |
416 | ret = NET_RX_SUCCESS; | |
c6c8fea2 | 417 | |
b91a2543 SE |
418 | /* skb was consumed */ |
419 | skb = NULL; | |
420 | ||
421 | put_orig_node: | |
79a0bffb | 422 | batadv_orig_node_put(orig_node); |
b91a2543 SE |
423 | free_skb: |
424 | kfree_skb(skb); | |
425 | ||
c6c8fea2 SE |
426 | return ret; |
427 | } | |
428 | ||
f86ce0ad | 429 | /** |
7e9a8c2c | 430 | * batadv_check_unicast_packet() - Check for malformed unicast packets |
6e0895c2 | 431 | * @bat_priv: the bat priv with all the soft interface information |
f86ce0ad MH |
432 | * @skb: packet to check |
433 | * @hdr_size: size of header to pull | |
434 | * | |
bccb48c8 | 435 | * Checks for short header and bad addresses in the given packet. |
62fe710f SE |
436 | * |
437 | * Return: negative value when check fails and 0 otherwise. The negative value | |
438 | * depends on the reason: -ENODATA for bad header, -EBADR for broadcast | |
439 | * destination or source, and -EREMOTE for non-local (other host) destination. | |
f86ce0ad | 440 | */ |
fe8a93b9 AQ |
441 | static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, |
442 | struct sk_buff *skb, int hdr_size) | |
ff51fd70 MH |
443 | { |
444 | struct ethhdr *ethhdr; | |
445 | ||
446 | /* drop packet if it has not necessary minimum size */ | |
447 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
f86ce0ad | 448 | return -ENODATA; |
ff51fd70 | 449 | |
7ed4be95 | 450 | ethhdr = eth_hdr(skb); |
ff51fd70 | 451 | |
93bbaab4 SE |
452 | /* packet with unicast indication but non-unicast recipient */ |
453 | if (!is_valid_ether_addr(ethhdr->h_dest)) | |
f86ce0ad | 454 | return -EBADR; |
ff51fd70 | 455 | |
9f75c8e1 SE |
456 | /* packet with broadcast/multicast sender address */ |
457 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
f86ce0ad | 458 | return -EBADR; |
ff51fd70 MH |
459 | |
460 | /* not for me */ | |
fe8a93b9 | 461 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
f86ce0ad | 462 | return -EREMOTE; |
ff51fd70 MH |
463 | |
464 | return 0; | |
465 | } | |
466 | ||
93652344 | 467 | /** |
7e9a8c2c | 468 | * batadv_last_bonding_get() - Get last_bonding_candidate of orig_node |
93652344 SE |
469 | * @orig_node: originator node whose last bonding candidate should be retrieved |
470 | * | |
471 | * Return: last bonding candidate of router or NULL if not found | |
472 | * | |
473 | * The object is returned with refcounter increased by 1. | |
474 | */ | |
475 | static struct batadv_orig_ifinfo * | |
476 | batadv_last_bonding_get(struct batadv_orig_node *orig_node) | |
477 | { | |
478 | struct batadv_orig_ifinfo *last_bonding_candidate; | |
479 | ||
480 | spin_lock_bh(&orig_node->neigh_list_lock); | |
481 | last_bonding_candidate = orig_node->last_bonding_candidate; | |
482 | ||
483 | if (last_bonding_candidate) | |
484 | kref_get(&last_bonding_candidate->refcount); | |
485 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
486 | ||
487 | return last_bonding_candidate; | |
488 | } | |
489 | ||
15c2ed75 | 490 | /** |
7e9a8c2c | 491 | * batadv_last_bonding_replace() - Replace last_bonding_candidate of orig_node |
15c2ed75 SE |
492 | * @orig_node: originator node whose bonding candidates should be replaced |
493 | * @new_candidate: new bonding candidate or NULL | |
494 | */ | |
495 | static void | |
496 | batadv_last_bonding_replace(struct batadv_orig_node *orig_node, | |
497 | struct batadv_orig_ifinfo *new_candidate) | |
498 | { | |
499 | struct batadv_orig_ifinfo *old_candidate; | |
500 | ||
501 | spin_lock_bh(&orig_node->neigh_list_lock); | |
502 | old_candidate = orig_node->last_bonding_candidate; | |
503 | ||
504 | if (new_candidate) | |
505 | kref_get(&new_candidate->refcount); | |
506 | orig_node->last_bonding_candidate = new_candidate; | |
507 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
508 | ||
79a0bffb | 509 | batadv_orig_ifinfo_put(old_candidate); |
15c2ed75 SE |
510 | } |
511 | ||
f6c8b711 | 512 | /** |
7e9a8c2c | 513 | * batadv_find_router() - find a suitable router for this originator |
f6c8b711 SW |
514 | * @bat_priv: the bat priv with all the soft interface information |
515 | * @orig_node: the destination node | |
516 | * @recv_if: pointer to interface this packet was received on | |
517 | * | |
62fe710f | 518 | * Return: the router which should be used for this orig_node on |
f6c8b711 | 519 | * this interface, or NULL if not available. |
9cfc7bd6 | 520 | */ |
56303d34 SE |
521 | struct batadv_neigh_node * |
522 | batadv_find_router(struct batadv_priv *bat_priv, | |
523 | struct batadv_orig_node *orig_node, | |
f3b3d901 | 524 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 525 | { |
29824a55 | 526 | struct batadv_algo_ops *bao = bat_priv->algo_ops; |
f3b3d901 SW |
527 | struct batadv_neigh_node *first_candidate_router = NULL; |
528 | struct batadv_neigh_node *next_candidate_router = NULL; | |
529 | struct batadv_neigh_node *router, *cand_router = NULL; | |
530 | struct batadv_neigh_node *last_cand_router = NULL; | |
531 | struct batadv_orig_ifinfo *cand, *first_candidate = NULL; | |
532 | struct batadv_orig_ifinfo *next_candidate = NULL; | |
533 | struct batadv_orig_ifinfo *last_candidate; | |
534 | bool last_candidate_found = false; | |
c6c8fea2 SE |
535 | |
536 | if (!orig_node) | |
537 | return NULL; | |
538 | ||
7351a482 | 539 | router = batadv_orig_router_get(orig_node, recv_if); |
c6c8fea2 | 540 | |
329887ad SW |
541 | if (!router) |
542 | return router; | |
543 | ||
f3b3d901 SW |
544 | /* only consider bonding for recv_if == BATADV_IF_DEFAULT (first hop) |
545 | * and if activated. | |
546 | */ | |
329887ad | 547 | if (!(recv_if == BATADV_IF_DEFAULT && atomic_read(&bat_priv->bonding))) |
f3b3d901 SW |
548 | return router; |
549 | ||
550 | /* bonding: loop through the list of possible routers found | |
551 | * for the various outgoing interfaces and find a candidate after | |
552 | * the last chosen bonding candidate (next_candidate). If no such | |
553 | * router is found, use the first candidate found (the previously | |
554 | * chosen bonding candidate might have been the last one in the list). | |
3f68785e | 555 | * If this can't be found either, return the previously chosen |
f3b3d901 SW |
556 | * router - obviously there are no other candidates. |
557 | */ | |
558 | rcu_read_lock(); | |
93652344 | 559 | last_candidate = batadv_last_bonding_get(orig_node); |
f3b3d901 SW |
560 | if (last_candidate) |
561 | last_cand_router = rcu_dereference(last_candidate->router); | |
562 | ||
563 | hlist_for_each_entry_rcu(cand, &orig_node->ifinfo_list, list) { | |
564 | /* acquire some structures and references ... */ | |
a6ba0d34 | 565 | if (!kref_get_unless_zero(&cand->refcount)) |
f3b3d901 SW |
566 | continue; |
567 | ||
568 | cand_router = rcu_dereference(cand->router); | |
569 | if (!cand_router) | |
570 | goto next; | |
571 | ||
77ae32e8 | 572 | if (!kref_get_unless_zero(&cand_router->refcount)) { |
f3b3d901 SW |
573 | cand_router = NULL; |
574 | goto next; | |
575 | } | |
576 | ||
577 | /* alternative candidate should be good enough to be | |
578 | * considered | |
579 | */ | |
29824a55 AQ |
580 | if (!bao->neigh.is_similar_or_better(cand_router, |
581 | cand->if_outgoing, router, | |
582 | recv_if)) | |
f3b3d901 SW |
583 | goto next; |
584 | ||
585 | /* don't use the same router twice */ | |
586 | if (last_cand_router == cand_router) | |
587 | goto next; | |
588 | ||
589 | /* mark the first possible candidate */ | |
590 | if (!first_candidate) { | |
77ae32e8 | 591 | kref_get(&cand_router->refcount); |
a6ba0d34 | 592 | kref_get(&cand->refcount); |
f3b3d901 SW |
593 | first_candidate = cand; |
594 | first_candidate_router = cand_router; | |
595 | } | |
596 | ||
597 | /* check if the loop has already passed the previously selected | |
598 | * candidate ... this function should select the next candidate | |
599 | * AFTER the previously used bonding candidate. | |
600 | */ | |
601 | if (!last_candidate || last_candidate_found) { | |
602 | next_candidate = cand; | |
603 | next_candidate_router = cand_router; | |
604 | break; | |
605 | } | |
606 | ||
607 | if (last_candidate == cand) | |
608 | last_candidate_found = true; | |
609 | next: | |
610 | /* free references */ | |
611 | if (cand_router) { | |
25bb2509 | 612 | batadv_neigh_node_put(cand_router); |
f3b3d901 SW |
613 | cand_router = NULL; |
614 | } | |
35f94779 | 615 | batadv_orig_ifinfo_put(cand); |
f3b3d901 SW |
616 | } |
617 | rcu_read_unlock(); | |
618 | ||
f3b3d901 SW |
619 | /* After finding candidates, handle the three cases: |
620 | * 1) there is a next candidate, use that | |
621 | * 2) there is no next candidate, use the first of the list | |
622 | * 3) there is no candidate at all, return the default router | |
623 | */ | |
624 | if (next_candidate) { | |
25bb2509 | 625 | batadv_neigh_node_put(router); |
f3b3d901 | 626 | |
15c2ed75 | 627 | kref_get(&next_candidate_router->refcount); |
f3b3d901 | 628 | router = next_candidate_router; |
15c2ed75 | 629 | batadv_last_bonding_replace(orig_node, next_candidate); |
f3b3d901 | 630 | } else if (first_candidate) { |
25bb2509 | 631 | batadv_neigh_node_put(router); |
f3b3d901 | 632 | |
15c2ed75 | 633 | kref_get(&first_candidate_router->refcount); |
f3b3d901 | 634 | router = first_candidate_router; |
15c2ed75 | 635 | batadv_last_bonding_replace(orig_node, first_candidate); |
f3b3d901 | 636 | } else { |
15c2ed75 SE |
637 | batadv_last_bonding_replace(orig_node, NULL); |
638 | } | |
639 | ||
640 | /* cleanup of candidates */ | |
641 | if (first_candidate) { | |
642 | batadv_neigh_node_put(first_candidate_router); | |
643 | batadv_orig_ifinfo_put(first_candidate); | |
644 | } | |
645 | ||
646 | if (next_candidate) { | |
647 | batadv_neigh_node_put(next_candidate_router); | |
648 | batadv_orig_ifinfo_put(next_candidate); | |
f3b3d901 | 649 | } |
f6c8b711 | 650 | |
79a0bffb | 651 | batadv_orig_ifinfo_put(last_candidate); |
93652344 | 652 | |
c6c8fea2 SE |
653 | return router; |
654 | } | |
655 | ||
63b01037 | 656 | static int batadv_route_unicast_packet(struct sk_buff *skb, |
56303d34 | 657 | struct batadv_hard_iface *recv_if) |
c6c8fea2 | 658 | { |
56303d34 SE |
659 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
660 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 661 | struct batadv_unicast_packet *unicast_packet; |
7ed4be95 | 662 | struct ethhdr *ethhdr = eth_hdr(skb); |
c54f38c9 | 663 | int res, hdr_len, ret = NET_RX_DROP; |
63d443ef | 664 | unsigned int len; |
c6c8fea2 | 665 | |
96412690 | 666 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c6c8fea2 SE |
667 | |
668 | /* TTL exceeded */ | |
a40d9b07 | 669 | if (unicast_packet->ttl < 2) { |
86ceb360 SE |
670 | pr_debug("Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", |
671 | ethhdr->h_source, unicast_packet->dest); | |
b91a2543 | 672 | goto free_skb; |
c6c8fea2 SE |
673 | } |
674 | ||
675 | /* get routing information */ | |
da641193 | 676 | orig_node = batadv_orig_hash_find(bat_priv, unicast_packet->dest); |
7aadf889 | 677 | |
44524fcd | 678 | if (!orig_node) |
b91a2543 | 679 | goto free_skb; |
c6c8fea2 | 680 | |
c6c8fea2 | 681 | /* create a copy of the skb, if needed, to modify it. */ |
0d125074 | 682 | if (skb_cow(skb, ETH_HLEN) < 0) |
b91a2543 | 683 | goto put_orig_node; |
c6c8fea2 | 684 | |
c6c8fea2 | 685 | /* decrement ttl */ |
f097e25d | 686 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 687 | unicast_packet->ttl--; |
c6c8fea2 | 688 | |
a40d9b07 | 689 | switch (unicast_packet->packet_type) { |
c54f38c9 SW |
690 | case BATADV_UNICAST_4ADDR: |
691 | hdr_len = sizeof(struct batadv_unicast_4addr_packet); | |
692 | break; | |
693 | case BATADV_UNICAST: | |
694 | hdr_len = sizeof(struct batadv_unicast_packet); | |
695 | break; | |
696 | default: | |
697 | /* other packet types not supported - yet */ | |
698 | hdr_len = -1; | |
699 | break; | |
700 | } | |
701 | ||
702 | if (hdr_len > 0) | |
703 | batadv_skb_set_priority(skb, hdr_len); | |
704 | ||
63d443ef | 705 | len = skb->len; |
e91ecfc6 | 706 | res = batadv_send_skb_to_orig(skb, orig_node, recv_if); |
95332477 | 707 | |
e91ecfc6 MH |
708 | /* translate transmit result into receive result */ |
709 | if (res == NET_XMIT_SUCCESS) { | |
0843f197 | 710 | ret = NET_RX_SUCCESS; |
e91ecfc6 | 711 | /* skb was transmitted and consumed */ |
95332477 MH |
712 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); |
713 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
63d443ef | 714 | len + ETH_HLEN); |
95332477 | 715 | } |
c6c8fea2 | 716 | |
0843f197 GF |
717 | /* skb was consumed */ |
718 | skb = NULL; | |
719 | ||
b91a2543 SE |
720 | put_orig_node: |
721 | batadv_orig_node_put(orig_node); | |
722 | free_skb: | |
723 | kfree_skb(skb); | |
f50ca95a | 724 | |
44524fcd | 725 | return ret; |
c6c8fea2 SE |
726 | } |
727 | ||
7c1fd91d | 728 | /** |
7e9a8c2c | 729 | * batadv_reroute_unicast_packet() - update the unicast header for re-routing |
7c1fd91d | 730 | * @bat_priv: the bat priv with all the soft interface information |
fc04fdb2 | 731 | * @skb: unicast packet to process |
7c1fd91d AQ |
732 | * @unicast_packet: the unicast header to be updated |
733 | * @dst_addr: the payload destination | |
c018ad3d | 734 | * @vid: VLAN identifier |
7c1fd91d AQ |
735 | * |
736 | * Search the translation table for dst_addr and update the unicast header with | |
737 | * the new corresponding information (originator address where the destination | |
738 | * client currently is and its known TTVN) | |
739 | * | |
62fe710f | 740 | * Return: true if the packet header has been updated, false otherwise |
7c1fd91d AQ |
741 | */ |
742 | static bool | |
fc04fdb2 | 743 | batadv_reroute_unicast_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
7c1fd91d | 744 | struct batadv_unicast_packet *unicast_packet, |
6b5e971a | 745 | u8 *dst_addr, unsigned short vid) |
7c1fd91d AQ |
746 | { |
747 | struct batadv_orig_node *orig_node = NULL; | |
748 | struct batadv_hard_iface *primary_if = NULL; | |
749 | bool ret = false; | |
47ce5f1e JK |
750 | const u8 *orig_addr; |
751 | u8 orig_ttvn; | |
7c1fd91d | 752 | |
c018ad3d | 753 | if (batadv_is_my_client(bat_priv, dst_addr, vid)) { |
7c1fd91d AQ |
754 | primary_if = batadv_primary_if_get_selected(bat_priv); |
755 | if (!primary_if) | |
756 | goto out; | |
757 | orig_addr = primary_if->net_dev->dev_addr; | |
6b5e971a | 758 | orig_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
7c1fd91d | 759 | } else { |
c018ad3d AQ |
760 | orig_node = batadv_transtable_search(bat_priv, NULL, dst_addr, |
761 | vid); | |
7c1fd91d AQ |
762 | if (!orig_node) |
763 | goto out; | |
764 | ||
765 | if (batadv_compare_eth(orig_node->orig, unicast_packet->dest)) | |
766 | goto out; | |
767 | ||
768 | orig_addr = orig_node->orig; | |
6b5e971a | 769 | orig_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
7c1fd91d AQ |
770 | } |
771 | ||
772 | /* update the packet header */ | |
fc04fdb2 | 773 | skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
8fdd0153 | 774 | ether_addr_copy(unicast_packet->dest, orig_addr); |
7c1fd91d | 775 | unicast_packet->ttvn = orig_ttvn; |
fc04fdb2 | 776 | skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); |
7c1fd91d AQ |
777 | |
778 | ret = true; | |
779 | out: | |
79a0bffb SE |
780 | batadv_hardif_put(primary_if); |
781 | batadv_orig_node_put(orig_node); | |
7c1fd91d AQ |
782 | |
783 | return ret; | |
784 | } | |
785 | ||
4b426b10 SE |
786 | static bool batadv_check_unicast_ttvn(struct batadv_priv *bat_priv, |
787 | struct sk_buff *skb, int hdr_len) | |
788 | { | |
c018ad3d AQ |
789 | struct batadv_unicast_packet *unicast_packet; |
790 | struct batadv_hard_iface *primary_if; | |
56303d34 | 791 | struct batadv_orig_node *orig_node; |
6b5e971a | 792 | u8 curr_ttvn, old_ttvn; |
a73105b8 | 793 | struct ethhdr *ethhdr; |
c018ad3d | 794 | unsigned short vid; |
3e34819e | 795 | int is_old_ttvn; |
a73105b8 | 796 | |
b8fcfa42 | 797 | /* check if there is enough data before accessing it */ |
f1791425 | 798 | if (!pskb_may_pull(skb, hdr_len + ETH_HLEN)) |
4b426b10 | 799 | return false; |
b8fcfa42 AQ |
800 | |
801 | /* create a copy of the skb (in case of for re-routing) to modify it. */ | |
802 | if (skb_cow(skb, sizeof(*unicast_packet)) < 0) | |
4b426b10 | 803 | return false; |
a73105b8 | 804 | |
96412690 | 805 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
c018ad3d | 806 | vid = batadv_get_vid(skb, hdr_len); |
dd981ab0 | 807 | ethhdr = (struct ethhdr *)(skb->data + hdr_len); |
a73105b8 | 808 | |
7dda5b33 LL |
809 | /* do not reroute multicast frames in a unicast header */ |
810 | if (is_multicast_ether_addr(ethhdr->h_dest)) | |
811 | return true; | |
812 | ||
7c1fd91d AQ |
813 | /* check if the destination client was served by this node and it is now |
814 | * roaming. In this case, it means that the node has got a ROAM_ADV | |
815 | * message and that it knows the new destination in the mesh to re-route | |
816 | * the packet to | |
817 | */ | |
c018ad3d | 818 | if (batadv_tt_local_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) { |
fc04fdb2 | 819 | if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, |
c018ad3d | 820 | ethhdr->h_dest, vid)) |
23c4ec10 AG |
821 | batadv_dbg_ratelimited(BATADV_DBG_TT, |
822 | bat_priv, | |
823 | "Rerouting unicast packet to %pM (dst=%pM): Local Roaming\n", | |
824 | unicast_packet->dest, | |
825 | ethhdr->h_dest); | |
7c1fd91d AQ |
826 | /* at this point the mesh destination should have been |
827 | * substituted with the originator address found in the global | |
828 | * table. If not, let the packet go untouched anyway because | |
829 | * there is nothing the node can do | |
830 | */ | |
4b426b10 | 831 | return true; |
7c1fd91d AQ |
832 | } |
833 | ||
834 | /* retrieve the TTVN known by this node for the packet destination. This | |
835 | * value is used later to check if the node which sent (or re-routed | |
836 | * last time) the packet had an updated information or not | |
837 | */ | |
6b5e971a | 838 | curr_ttvn = (u8)atomic_read(&bat_priv->tt.vn); |
fe8a93b9 | 839 | if (!batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
da641193 SE |
840 | orig_node = batadv_orig_hash_find(bat_priv, |
841 | unicast_packet->dest); | |
7c1fd91d AQ |
842 | /* if it is not possible to find the orig_node representing the |
843 | * destination, the packet can immediately be dropped as it will | |
844 | * not be possible to deliver it | |
845 | */ | |
a73105b8 | 846 | if (!orig_node) |
4b426b10 | 847 | return false; |
a73105b8 | 848 | |
6b5e971a | 849 | curr_ttvn = (u8)atomic_read(&orig_node->last_ttvn); |
5d967310 | 850 | batadv_orig_node_put(orig_node); |
a73105b8 AQ |
851 | } |
852 | ||
7c1fd91d AQ |
853 | /* check if the TTVN contained in the packet is fresher than what the |
854 | * node knows | |
855 | */ | |
3e34819e | 856 | is_old_ttvn = batadv_seq_before(unicast_packet->ttvn, curr_ttvn); |
7c1fd91d | 857 | if (!is_old_ttvn) |
4b426b10 | 858 | return true; |
a73105b8 | 859 | |
7c1fd91d AQ |
860 | old_ttvn = unicast_packet->ttvn; |
861 | /* the packet was forged based on outdated network information. Its | |
862 | * destination can possibly be updated and forwarded towards the new | |
863 | * target host | |
864 | */ | |
fc04fdb2 | 865 | if (batadv_reroute_unicast_packet(bat_priv, skb, unicast_packet, |
c018ad3d | 866 | ethhdr->h_dest, vid)) { |
23c4ec10 AG |
867 | batadv_dbg_ratelimited(BATADV_DBG_TT, bat_priv, |
868 | "Rerouting unicast packet to %pM (dst=%pM): TTVN mismatch old_ttvn=%u new_ttvn=%u\n", | |
869 | unicast_packet->dest, ethhdr->h_dest, | |
870 | old_ttvn, curr_ttvn); | |
4b426b10 | 871 | return true; |
7c1fd91d | 872 | } |
3275e7cc | 873 | |
7c1fd91d AQ |
874 | /* the packet has not been re-routed: either the destination is |
875 | * currently served by this node or there is no destination at all and | |
876 | * it is possible to drop the packet | |
877 | */ | |
c018ad3d | 878 | if (!batadv_is_my_client(bat_priv, ethhdr->h_dest, vid)) |
4b426b10 | 879 | return false; |
3275e7cc | 880 | |
7c1fd91d AQ |
881 | /* update the header in order to let the packet be delivered to this |
882 | * node's soft interface | |
883 | */ | |
884 | primary_if = batadv_primary_if_get_selected(bat_priv); | |
885 | if (!primary_if) | |
4b426b10 | 886 | return false; |
a73105b8 | 887 | |
fc04fdb2 SE |
888 | /* update the packet header */ |
889 | skb_postpull_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); | |
8fdd0153 | 890 | ether_addr_copy(unicast_packet->dest, primary_if->net_dev->dev_addr); |
fc04fdb2 SE |
891 | unicast_packet->ttvn = curr_ttvn; |
892 | skb_postpush_rcsum(skb, unicast_packet, sizeof(*unicast_packet)); | |
7c1fd91d | 893 | |
82047ad7 | 894 | batadv_hardif_put(primary_if); |
7c1fd91d | 895 | |
4b426b10 | 896 | return true; |
a73105b8 AQ |
897 | } |
898 | ||
a1f1ac5c | 899 | /** |
7e9a8c2c | 900 | * batadv_recv_unhandled_unicast_packet() - receive and process packets which |
a1f1ac5c SW |
901 | * are in the unicast number space but not yet known to the implementation |
902 | * @skb: unicast tvlv packet to process | |
903 | * @recv_if: pointer to interface this packet was received on | |
904 | * | |
62fe710f | 905 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
a1f1ac5c SW |
906 | * otherwise. |
907 | */ | |
908 | int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb, | |
909 | struct batadv_hard_iface *recv_if) | |
910 | { | |
911 | struct batadv_unicast_packet *unicast_packet; | |
912 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
913 | int check, hdr_size = sizeof(*unicast_packet); | |
914 | ||
915 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); | |
916 | if (check < 0) | |
b91a2543 | 917 | goto free_skb; |
a1f1ac5c SW |
918 | |
919 | /* we don't know about this type, drop it. */ | |
920 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
921 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) | |
b91a2543 | 922 | goto free_skb; |
a1f1ac5c SW |
923 | |
924 | return batadv_route_unicast_packet(skb, recv_if); | |
b91a2543 SE |
925 | |
926 | free_skb: | |
927 | kfree_skb(skb); | |
928 | return NET_RX_DROP; | |
a1f1ac5c SW |
929 | } |
930 | ||
ff15c27c SE |
931 | /** |
932 | * batadv_recv_unicast_packet() - Process incoming unicast packet | |
933 | * @skb: incoming packet buffer | |
934 | * @recv_if: incoming hard interface | |
935 | * | |
936 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
937 | */ | |
56303d34 SE |
938 | int batadv_recv_unicast_packet(struct sk_buff *skb, |
939 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 940 | { |
56303d34 | 941 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
96412690 | 942 | struct batadv_unicast_packet *unicast_packet; |
4046b24a | 943 | struct batadv_unicast_4addr_packet *unicast_4addr_packet; |
9e794b6b AP |
944 | u8 *orig_addr, *orig_addr_gw; |
945 | struct batadv_orig_node *orig_node = NULL, *orig_node_gw = NULL; | |
612d2b4f | 946 | int check, hdr_size = sizeof(*unicast_packet); |
437bb0e6 | 947 | enum batadv_subtype subtype; |
b91a2543 | 948 | int ret = NET_RX_DROP; |
9e794b6b | 949 | bool is4addr, is_gw; |
c6c8fea2 | 950 | |
7cdcf6dd | 951 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
a40d9b07 | 952 | is4addr = unicast_packet->packet_type == BATADV_UNICAST_4ADDR; |
7cdcf6dd | 953 | /* the caller function should have already pulled 2 bytes */ |
c384ea3e | 954 | if (is4addr) |
4046b24a | 955 | hdr_size = sizeof(*unicast_4addr_packet); |
7cdcf6dd | 956 | |
612d2b4f | 957 | /* function returns -EREMOTE for promiscuous packets */ |
6e0895c2 | 958 | check = batadv_check_unicast_packet(bat_priv, skb, hdr_size); |
612d2b4f MH |
959 | |
960 | /* Even though the packet is not for us, we might save it to use for | |
961 | * decoding a later received coded packet | |
962 | */ | |
963 | if (check == -EREMOTE) | |
964 | batadv_nc_skb_store_sniffed_unicast(bat_priv, skb); | |
965 | ||
966 | if (check < 0) | |
b91a2543 | 967 | goto free_skb; |
dd981ab0 | 968 | if (!batadv_check_unicast_ttvn(bat_priv, skb, hdr_size)) |
b91a2543 | 969 | goto free_skb; |
a73105b8 | 970 | |
bc44b781 MS |
971 | unicast_packet = (struct batadv_unicast_packet *)skb->data; |
972 | ||
c6c8fea2 | 973 | /* packet for me */ |
fe8a93b9 | 974 | if (batadv_is_my_mac(bat_priv, unicast_packet->dest)) { |
9e794b6b AP |
975 | /* If this is a unicast packet from another backgone gw, |
976 | * drop it. | |
977 | */ | |
bc44b781 | 978 | orig_addr_gw = eth_hdr(skb)->h_source; |
9e794b6b AP |
979 | orig_node_gw = batadv_orig_hash_find(bat_priv, orig_addr_gw); |
980 | if (orig_node_gw) { | |
981 | is_gw = batadv_bla_is_backbone_gw(skb, orig_node_gw, | |
982 | hdr_size); | |
983 | batadv_orig_node_put(orig_node_gw); | |
984 | if (is_gw) { | |
985 | batadv_dbg(BATADV_DBG_BLA, bat_priv, | |
22f0502e SE |
986 | "%s(): Dropped unicast pkt received from another backbone gw %pM.\n", |
987 | __func__, orig_addr_gw); | |
a1a745ef | 988 | goto free_skb; |
9e794b6b AP |
989 | } |
990 | } | |
991 | ||
9affec6b | 992 | if (is4addr) { |
bc44b781 MS |
993 | unicast_4addr_packet = |
994 | (struct batadv_unicast_4addr_packet *)skb->data; | |
437bb0e6 SW |
995 | subtype = unicast_4addr_packet->subtype; |
996 | batadv_dat_inc_counter(bat_priv, subtype); | |
997 | ||
998 | /* Only payload data should be considered for speedy | |
999 | * join. For example, DAT also uses unicast 4addr | |
1000 | * types, but those packets should not be considered | |
1001 | * for speedy join, since the clients do not actually | |
1002 | * reside at the sending originator. | |
1003 | */ | |
1004 | if (subtype == BATADV_P_DATA) { | |
1005 | orig_addr = unicast_4addr_packet->src; | |
1006 | orig_node = batadv_orig_hash_find(bat_priv, | |
1007 | orig_addr); | |
1008 | } | |
9affec6b | 1009 | } |
4046b24a | 1010 | |
c384ea3e AQ |
1011 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, |
1012 | hdr_size)) | |
1013 | goto rx_success; | |
1014 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, | |
1015 | hdr_size)) | |
1016 | goto rx_success; | |
1017 | ||
b61ec31c LL |
1018 | batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
1019 | ||
6535db56 | 1020 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, |
9affec6b | 1021 | orig_node); |
37135173 | 1022 | |
c384ea3e | 1023 | rx_success: |
79a0bffb | 1024 | batadv_orig_node_put(orig_node); |
9affec6b | 1025 | |
c6c8fea2 SE |
1026 | return NET_RX_SUCCESS; |
1027 | } | |
1028 | ||
b91a2543 SE |
1029 | ret = batadv_route_unicast_packet(skb, recv_if); |
1030 | /* skb was consumed */ | |
1031 | skb = NULL; | |
1032 | ||
1033 | free_skb: | |
1034 | kfree_skb(skb); | |
1035 | ||
1036 | return ret; | |
c6c8fea2 SE |
1037 | } |
1038 | ||
ef261577 | 1039 | /** |
7e9a8c2c | 1040 | * batadv_recv_unicast_tvlv() - receive and process unicast tvlv packets |
ef261577 ML |
1041 | * @skb: unicast tvlv packet to process |
1042 | * @recv_if: pointer to interface this packet was received on | |
ef261577 | 1043 | * |
62fe710f | 1044 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP |
ef261577 ML |
1045 | * otherwise. |
1046 | */ | |
1047 | int batadv_recv_unicast_tvlv(struct sk_buff *skb, | |
1048 | struct batadv_hard_iface *recv_if) | |
1049 | { | |
1050 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1051 | struct batadv_unicast_tvlv_packet *unicast_tvlv_packet; | |
1052 | unsigned char *tvlv_buff; | |
6b5e971a | 1053 | u16 tvlv_buff_len; |
ef261577 ML |
1054 | int hdr_size = sizeof(*unicast_tvlv_packet); |
1055 | int ret = NET_RX_DROP; | |
1056 | ||
1057 | if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0) | |
b91a2543 | 1058 | goto free_skb; |
ef261577 ML |
1059 | |
1060 | /* the header is likely to be modified while forwarding */ | |
1061 | if (skb_cow(skb, hdr_size) < 0) | |
b91a2543 | 1062 | goto free_skb; |
ef261577 ML |
1063 | |
1064 | /* packet needs to be linearized to access the tvlv content */ | |
1065 | if (skb_linearize(skb) < 0) | |
b91a2543 | 1066 | goto free_skb; |
ef261577 ML |
1067 | |
1068 | unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)skb->data; | |
1069 | ||
1070 | tvlv_buff = (unsigned char *)(skb->data + hdr_size); | |
1071 | tvlv_buff_len = ntohs(unicast_tvlv_packet->tvlv_len); | |
1072 | ||
1073 | if (tvlv_buff_len > skb->len - hdr_size) | |
b91a2543 | 1074 | goto free_skb; |
ef261577 | 1075 | |
0c4061c0 LL |
1076 | ret = batadv_tvlv_containers_process(bat_priv, BATADV_UNICAST_TVLV, |
1077 | NULL, skb, tvlv_buff, | |
1078 | tvlv_buff_len); | |
ef261577 | 1079 | |
b91a2543 | 1080 | if (ret != NET_RX_SUCCESS) { |
ef261577 | 1081 | ret = batadv_route_unicast_packet(skb, recv_if); |
b91a2543 SE |
1082 | /* skb was consumed */ |
1083 | skb = NULL; | |
1084 | } | |
1085 | ||
1086 | free_skb: | |
1087 | kfree_skb(skb); | |
ef261577 ML |
1088 | |
1089 | return ret; | |
1090 | } | |
c6c8fea2 | 1091 | |
610bfc6b | 1092 | /** |
7e9a8c2c | 1093 | * batadv_recv_frag_packet() - process received fragment |
610bfc6b MH |
1094 | * @skb: the received fragment |
1095 | * @recv_if: interface that the skb is received on | |
1096 | * | |
1097 | * This function does one of the three following things: 1) Forward fragment, if | |
bccb48c8 | 1098 | * the assembled packet will exceed our MTU; 2) Buffer fragment, if we still |
610bfc6b MH |
1099 | * lack further fragments; 3) Merge fragments, if we have all needed parts. |
1100 | * | |
62fe710f | 1101 | * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise. |
610bfc6b MH |
1102 | */ |
1103 | int batadv_recv_frag_packet(struct sk_buff *skb, | |
1104 | struct batadv_hard_iface *recv_if) | |
1105 | { | |
1106 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1107 | struct batadv_orig_node *orig_node_src = NULL; | |
1108 | struct batadv_frag_packet *frag_packet; | |
1109 | int ret = NET_RX_DROP; | |
1110 | ||
1111 | if (batadv_check_unicast_packet(bat_priv, skb, | |
1112 | sizeof(*frag_packet)) < 0) | |
b91a2543 | 1113 | goto free_skb; |
610bfc6b MH |
1114 | |
1115 | frag_packet = (struct batadv_frag_packet *)skb->data; | |
1116 | orig_node_src = batadv_orig_hash_find(bat_priv, frag_packet->orig); | |
1117 | if (!orig_node_src) | |
b91a2543 | 1118 | goto free_skb; |
610bfc6b | 1119 | |
c0f25c80 AL |
1120 | skb->priority = frag_packet->priority + 256; |
1121 | ||
610bfc6b MH |
1122 | /* Route the fragment if it is not for us and too big to be merged. */ |
1123 | if (!batadv_is_my_mac(bat_priv, frag_packet->dest) && | |
1124 | batadv_frag_skb_fwd(skb, recv_if, orig_node_src)) { | |
b91a2543 SE |
1125 | /* skb was consumed */ |
1126 | skb = NULL; | |
610bfc6b | 1127 | ret = NET_RX_SUCCESS; |
b91a2543 | 1128 | goto put_orig_node; |
610bfc6b MH |
1129 | } |
1130 | ||
1131 | batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_RX); | |
1132 | batadv_add_counter(bat_priv, BATADV_CNT_FRAG_RX_BYTES, skb->len); | |
1133 | ||
1134 | /* Add fragment to buffer and merge if possible. */ | |
1135 | if (!batadv_frag_skb_buffer(&skb, orig_node_src)) | |
b91a2543 | 1136 | goto put_orig_node; |
610bfc6b MH |
1137 | |
1138 | /* Deliver merged packet to the appropriate handler, if it was | |
1139 | * merged | |
1140 | */ | |
b91a2543 | 1141 | if (skb) { |
610bfc6b MH |
1142 | batadv_batman_skb_recv(skb, recv_if->net_dev, |
1143 | &recv_if->batman_adv_ptype, NULL); | |
b91a2543 SE |
1144 | /* skb was consumed */ |
1145 | skb = NULL; | |
1146 | } | |
610bfc6b MH |
1147 | |
1148 | ret = NET_RX_SUCCESS; | |
1149 | ||
b91a2543 SE |
1150 | put_orig_node: |
1151 | batadv_orig_node_put(orig_node_src); | |
1152 | free_skb: | |
1153 | kfree_skb(skb); | |
610bfc6b MH |
1154 | |
1155 | return ret; | |
1156 | } | |
1157 | ||
ff15c27c SE |
1158 | /** |
1159 | * batadv_recv_bcast_packet() - Process incoming broadcast packet | |
1160 | * @skb: incoming packet buffer | |
1161 | * @recv_if: incoming hard interface | |
1162 | * | |
1163 | * Return: NET_RX_SUCCESS on success or NET_RX_DROP in case of failure | |
1164 | */ | |
56303d34 SE |
1165 | int batadv_recv_bcast_packet(struct sk_buff *skb, |
1166 | struct batadv_hard_iface *recv_if) | |
c6c8fea2 | 1167 | { |
56303d34 SE |
1168 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); |
1169 | struct batadv_orig_node *orig_node = NULL; | |
96412690 | 1170 | struct batadv_bcast_packet *bcast_packet; |
c6c8fea2 | 1171 | struct ethhdr *ethhdr; |
704509b8 | 1172 | int hdr_size = sizeof(*bcast_packet); |
6b5e971a SE |
1173 | s32 seq_diff; |
1174 | u32 seqno; | |
3f693390 | 1175 | int ret; |
c6c8fea2 SE |
1176 | |
1177 | /* drop packet if it has not necessary minimum size */ | |
1178 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 1179 | goto free_skb; |
c6c8fea2 | 1180 | |
7ed4be95 | 1181 | ethhdr = eth_hdr(skb); |
c6c8fea2 SE |
1182 | |
1183 | /* packet with broadcast indication but unicast recipient */ | |
1184 | if (!is_broadcast_ether_addr(ethhdr->h_dest)) | |
b91a2543 | 1185 | goto free_skb; |
c6c8fea2 | 1186 | |
9f75c8e1 SE |
1187 | /* packet with broadcast/multicast sender address */ |
1188 | if (is_multicast_ether_addr(ethhdr->h_source)) | |
b91a2543 | 1189 | goto free_skb; |
c6c8fea2 SE |
1190 | |
1191 | /* ignore broadcasts sent by myself */ | |
fe8a93b9 | 1192 | if (batadv_is_my_mac(bat_priv, ethhdr->h_source)) |
b91a2543 | 1193 | goto free_skb; |
c6c8fea2 | 1194 | |
96412690 | 1195 | bcast_packet = (struct batadv_bcast_packet *)skb->data; |
c6c8fea2 SE |
1196 | |
1197 | /* ignore broadcasts originated by myself */ | |
fe8a93b9 | 1198 | if (batadv_is_my_mac(bat_priv, bcast_packet->orig)) |
b91a2543 | 1199 | goto free_skb; |
c6c8fea2 | 1200 | |
3f693390 | 1201 | if (bcast_packet->ttl-- < 2) |
b91a2543 | 1202 | goto free_skb; |
c6c8fea2 | 1203 | |
da641193 | 1204 | orig_node = batadv_orig_hash_find(bat_priv, bcast_packet->orig); |
f3e0008f ML |
1205 | |
1206 | if (!orig_node) | |
b91a2543 | 1207 | goto free_skb; |
c6c8fea2 | 1208 | |
f3e0008f | 1209 | spin_lock_bh(&orig_node->bcast_seqno_lock); |
c6c8fea2 | 1210 | |
3fba7325 | 1211 | seqno = ntohl(bcast_packet->seqno); |
c6c8fea2 | 1212 | /* check whether the packet is a duplicate */ |
9b4a1159 | 1213 | if (batadv_test_bit(orig_node->bcast_bits, orig_node->last_bcast_seqno, |
3fba7325 | 1214 | seqno)) |
f3e0008f | 1215 | goto spin_unlock; |
c6c8fea2 | 1216 | |
3fba7325 | 1217 | seq_diff = seqno - orig_node->last_bcast_seqno; |
c6c8fea2 SE |
1218 | |
1219 | /* check whether the packet is old and the host just restarted. */ | |
30d3c511 | 1220 | if (batadv_window_protected(bat_priv, seq_diff, |
81f02683 SW |
1221 | BATADV_BCAST_MAX_AGE, |
1222 | &orig_node->bcast_seqno_reset, NULL)) | |
f3e0008f | 1223 | goto spin_unlock; |
c6c8fea2 SE |
1224 | |
1225 | /* mark broadcast in flood history, update window position | |
9cfc7bd6 SE |
1226 | * if required. |
1227 | */ | |
0f5f9322 | 1228 | if (batadv_bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) |
3fba7325 | 1229 | orig_node->last_bcast_seqno = seqno; |
c6c8fea2 | 1230 | |
f3e0008f | 1231 | spin_unlock_bh(&orig_node->bcast_seqno_lock); |
f3e0008f | 1232 | |
fe2da6ff | 1233 | /* check whether this has been sent by another originator before */ |
004e86fc | 1234 | if (batadv_bla_check_bcast_duplist(bat_priv, skb)) |
b91a2543 | 1235 | goto free_skb; |
fe2da6ff | 1236 | |
c54f38c9 SW |
1237 | batadv_skb_set_priority(skb, sizeof(struct batadv_bcast_packet)); |
1238 | ||
c6c8fea2 | 1239 | /* rebroadcast packet */ |
3f693390 LL |
1240 | ret = batadv_forw_bcast_packet(bat_priv, skb, 0, false); |
1241 | if (ret == NETDEV_TX_BUSY) | |
1242 | goto free_skb; | |
c6c8fea2 | 1243 | |
23721387 SW |
1244 | /* don't hand the broadcast up if it is from an originator |
1245 | * from the same backbone. | |
1246 | */ | |
08adf151 | 1247 | if (batadv_bla_is_backbone_gw(skb, orig_node, hdr_size)) |
b91a2543 | 1248 | goto free_skb; |
23721387 | 1249 | |
c384ea3e AQ |
1250 | if (batadv_dat_snoop_incoming_arp_request(bat_priv, skb, hdr_size)) |
1251 | goto rx_success; | |
1252 | if (batadv_dat_snoop_incoming_arp_reply(bat_priv, skb, hdr_size)) | |
1253 | goto rx_success; | |
1254 | ||
b61ec31c LL |
1255 | batadv_dat_snoop_incoming_dhcp_ack(bat_priv, skb, hdr_size); |
1256 | ||
c6c8fea2 | 1257 | /* broadcast for me */ |
6535db56 | 1258 | batadv_interface_rx(recv_if->soft_iface, skb, hdr_size, orig_node); |
c384ea3e AQ |
1259 | |
1260 | rx_success: | |
f3e0008f ML |
1261 | ret = NET_RX_SUCCESS; |
1262 | goto out; | |
c6c8fea2 | 1263 | |
f3e0008f ML |
1264 | spin_unlock: |
1265 | spin_unlock_bh(&orig_node->bcast_seqno_lock); | |
b91a2543 SE |
1266 | free_skb: |
1267 | kfree_skb(skb); | |
3f693390 | 1268 | ret = NET_RX_DROP; |
f3e0008f | 1269 | out: |
79a0bffb | 1270 | batadv_orig_node_put(orig_node); |
f3e0008f | 1271 | return ret; |
c6c8fea2 | 1272 | } |