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Commit | Line | Data |
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1da177e4 | 1 | /* |
e905a9ed | 2 | * Linux NET3: GRE over IP protocol decoder. |
1da177e4 LT |
3 | * |
4 | * Authors: Alexey Kuznetsov (kuznet@ms2.inr.ac.ru) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | */ | |
12 | ||
afd46503 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
4fc268d2 | 15 | #include <linux/capability.h> |
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/types.h> | |
1da177e4 | 18 | #include <linux/kernel.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/in.h> | |
24 | #include <linux/tcp.h> | |
25 | #include <linux/udp.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/mroute.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/inetdevice.h> | |
31 | #include <linux/igmp.h> | |
32 | #include <linux/netfilter_ipv4.h> | |
e1a80002 | 33 | #include <linux/etherdevice.h> |
46f25dff | 34 | #include <linux/if_ether.h> |
1da177e4 LT |
35 | |
36 | #include <net/sock.h> | |
37 | #include <net/ip.h> | |
38 | #include <net/icmp.h> | |
39 | #include <net/protocol.h> | |
40 | #include <net/ipip.h> | |
41 | #include <net/arp.h> | |
42 | #include <net/checksum.h> | |
43 | #include <net/dsfield.h> | |
44 | #include <net/inet_ecn.h> | |
45 | #include <net/xfrm.h> | |
59a4c759 PE |
46 | #include <net/net_namespace.h> |
47 | #include <net/netns/generic.h> | |
c19e654d | 48 | #include <net/rtnetlink.h> |
00959ade | 49 | #include <net/gre.h> |
1da177e4 | 50 | |
dfd56b8b | 51 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
52 | #include <net/ipv6.h> |
53 | #include <net/ip6_fib.h> | |
54 | #include <net/ip6_route.h> | |
55 | #endif | |
56 | ||
57 | /* | |
58 | Problems & solutions | |
59 | -------------------- | |
60 | ||
61 | 1. The most important issue is detecting local dead loops. | |
62 | They would cause complete host lockup in transmit, which | |
63 | would be "resolved" by stack overflow or, if queueing is enabled, | |
64 | with infinite looping in net_bh. | |
65 | ||
66 | We cannot track such dead loops during route installation, | |
67 | it is infeasible task. The most general solutions would be | |
68 | to keep skb->encapsulation counter (sort of local ttl), | |
6d0722a2 | 69 | and silently drop packet when it expires. It is a good |
bff52857 | 70 | solution, but it supposes maintaining new variable in ALL |
1da177e4 LT |
71 | skb, even if no tunneling is used. |
72 | ||
6d0722a2 ED |
73 | Current solution: xmit_recursion breaks dead loops. This is a percpu |
74 | counter, since when we enter the first ndo_xmit(), cpu migration is | |
75 | forbidden. We force an exit if this counter reaches RECURSION_LIMIT | |
1da177e4 LT |
76 | |
77 | 2. Networking dead loops would not kill routers, but would really | |
78 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
79 | if we copy it from packet being encapsulated to upper header. | |
80 | It is very good solution, but it introduces two problems: | |
81 | ||
82 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
83 | do not work over tunnels. | |
84 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
85 | so that this problem would be solved and traceroute output | |
86 | would even more informative. This idea appeared to be wrong: | |
87 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
88 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
89 | return only 8 bytes of payload. It is the end. | |
90 | ||
91 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
92 | we should search for another solution. | |
93 | ||
94 | One of them is to parse packet trying to detect inner encapsulation | |
95 | made by our node. It is difficult or even impossible, especially, | |
bff52857 | 96 | taking into account fragmentation. TO be short, ttl is not solution at all. |
1da177e4 LT |
97 | |
98 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
99 | We force DF flag on tunnels with preconfigured hop limit, | |
100 | that is ALL. :-) Well, it does not remove the problem completely, | |
101 | but exponential growth of network traffic is changed to linear | |
102 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
bff52857 | 103 | rapidly degrades to value <68, where looping stops. |
1da177e4 LT |
104 | Yes, it is not good if there exists a router in the loop, |
105 | which does not force DF, even when encapsulating packets have DF set. | |
106 | But it is not our problem! Nobody could accuse us, we made | |
107 | all that we could make. Even if it is your gated who injected | |
108 | fatal route to network, even if it were you who configured | |
109 | fatal static route: you are innocent. :-) | |
110 | ||
111 | ||
112 | ||
113 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
114 | practically identical code. It would be good to glue them | |
115 | together, but it is not very evident, how to make them modular. | |
116 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
117 | We could extract common parts (hash table, ioctl etc) | |
118 | to a separate module (ip_tunnel.c). | |
119 | ||
120 | Alexey Kuznetsov. | |
121 | */ | |
122 | ||
c19e654d | 123 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
124 | static int ipgre_tunnel_init(struct net_device *dev); |
125 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 126 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
127 | |
128 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
129 | ||
eb8ce741 PE |
130 | #define HASH_SIZE 16 |
131 | ||
f99189b1 | 132 | static int ipgre_net_id __read_mostly; |
59a4c759 | 133 | struct ipgre_net { |
1507850b | 134 | struct ip_tunnel __rcu *tunnels[4][HASH_SIZE]; |
eb8ce741 | 135 | |
7daa0004 | 136 | struct net_device *fb_tunnel_dev; |
59a4c759 PE |
137 | }; |
138 | ||
1da177e4 LT |
139 | /* Tunnel hash table */ |
140 | ||
141 | /* | |
142 | 4 hash tables: | |
143 | ||
144 | 3: (remote,local) | |
145 | 2: (remote,*) | |
146 | 1: (*,local) | |
147 | 0: (*,*) | |
148 | ||
149 | We require exact key match i.e. if a key is present in packet | |
150 | it will match only tunnel with the same key; if it is not present, | |
151 | it will match only keyless tunnel. | |
152 | ||
153 | All keysless packets, if not matched configured keyless tunnels | |
154 | will match fallback tunnel. | |
155 | */ | |
156 | ||
d5a0a1e3 | 157 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 158 | |
eb8ce741 PE |
159 | #define tunnels_r_l tunnels[3] |
160 | #define tunnels_r tunnels[2] | |
161 | #define tunnels_l tunnels[1] | |
162 | #define tunnels_wc tunnels[0] | |
8d5b2c08 | 163 | /* |
1507850b | 164 | * Locking : hash tables are protected by RCU and RTNL |
8d5b2c08 | 165 | */ |
1da177e4 | 166 | |
8d5b2c08 ED |
167 | #define for_each_ip_tunnel_rcu(start) \ |
168 | for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) | |
1da177e4 | 169 | |
e985aad7 ED |
170 | /* often modified stats are per cpu, other are shared (netdev->stats) */ |
171 | struct pcpu_tstats { | |
172 | unsigned long rx_packets; | |
173 | unsigned long rx_bytes; | |
174 | unsigned long tx_packets; | |
175 | unsigned long tx_bytes; | |
8ce120f1 | 176 | } __attribute__((aligned(4*sizeof(unsigned long)))); |
e985aad7 ED |
177 | |
178 | static struct net_device_stats *ipgre_get_stats(struct net_device *dev) | |
179 | { | |
180 | struct pcpu_tstats sum = { 0 }; | |
181 | int i; | |
182 | ||
183 | for_each_possible_cpu(i) { | |
184 | const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); | |
185 | ||
186 | sum.rx_packets += tstats->rx_packets; | |
187 | sum.rx_bytes += tstats->rx_bytes; | |
188 | sum.tx_packets += tstats->tx_packets; | |
189 | sum.tx_bytes += tstats->tx_bytes; | |
190 | } | |
191 | dev->stats.rx_packets = sum.rx_packets; | |
192 | dev->stats.rx_bytes = sum.rx_bytes; | |
193 | dev->stats.tx_packets = sum.tx_packets; | |
194 | dev->stats.tx_bytes = sum.tx_bytes; | |
195 | return &dev->stats; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | /* Given src, dst and key, find appropriate for input tunnel. */ |
199 | ||
749c10f9 | 200 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev, |
e1a80002 HX |
201 | __be32 remote, __be32 local, |
202 | __be32 key, __be16 gre_proto) | |
1da177e4 | 203 | { |
749c10f9 TT |
204 | struct net *net = dev_net(dev); |
205 | int link = dev->ifindex; | |
1507850b ED |
206 | unsigned int h0 = HASH(remote); |
207 | unsigned int h1 = HASH(key); | |
afcf1242 | 208 | struct ip_tunnel *t, *cand = NULL; |
7daa0004 | 209 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
e1a80002 HX |
210 | int dev_type = (gre_proto == htons(ETH_P_TEB)) ? |
211 | ARPHRD_ETHER : ARPHRD_IPGRE; | |
afcf1242 | 212 | int score, cand_score = 4; |
1da177e4 | 213 | |
8d5b2c08 | 214 | for_each_ip_tunnel_rcu(ign->tunnels_r_l[h0 ^ h1]) { |
749c10f9 TT |
215 | if (local != t->parms.iph.saddr || |
216 | remote != t->parms.iph.daddr || | |
217 | key != t->parms.i_key || | |
218 | !(t->dev->flags & IFF_UP)) | |
219 | continue; | |
220 | ||
221 | if (t->dev->type != ARPHRD_IPGRE && | |
222 | t->dev->type != dev_type) | |
223 | continue; | |
224 | ||
afcf1242 | 225 | score = 0; |
749c10f9 | 226 | if (t->parms.link != link) |
afcf1242 | 227 | score |= 1; |
749c10f9 | 228 | if (t->dev->type != dev_type) |
afcf1242 TT |
229 | score |= 2; |
230 | if (score == 0) | |
749c10f9 | 231 | return t; |
afcf1242 TT |
232 | |
233 | if (score < cand_score) { | |
234 | cand = t; | |
235 | cand_score = score; | |
236 | } | |
1da177e4 | 237 | } |
e1a80002 | 238 | |
8d5b2c08 | 239 | for_each_ip_tunnel_rcu(ign->tunnels_r[h0 ^ h1]) { |
749c10f9 TT |
240 | if (remote != t->parms.iph.daddr || |
241 | key != t->parms.i_key || | |
242 | !(t->dev->flags & IFF_UP)) | |
243 | continue; | |
244 | ||
245 | if (t->dev->type != ARPHRD_IPGRE && | |
246 | t->dev->type != dev_type) | |
247 | continue; | |
248 | ||
afcf1242 | 249 | score = 0; |
749c10f9 | 250 | if (t->parms.link != link) |
afcf1242 | 251 | score |= 1; |
749c10f9 | 252 | if (t->dev->type != dev_type) |
afcf1242 TT |
253 | score |= 2; |
254 | if (score == 0) | |
749c10f9 | 255 | return t; |
afcf1242 TT |
256 | |
257 | if (score < cand_score) { | |
258 | cand = t; | |
259 | cand_score = score; | |
260 | } | |
1da177e4 | 261 | } |
e1a80002 | 262 | |
8d5b2c08 | 263 | for_each_ip_tunnel_rcu(ign->tunnels_l[h1]) { |
749c10f9 TT |
264 | if ((local != t->parms.iph.saddr && |
265 | (local != t->parms.iph.daddr || | |
266 | !ipv4_is_multicast(local))) || | |
267 | key != t->parms.i_key || | |
268 | !(t->dev->flags & IFF_UP)) | |
269 | continue; | |
270 | ||
271 | if (t->dev->type != ARPHRD_IPGRE && | |
272 | t->dev->type != dev_type) | |
273 | continue; | |
274 | ||
afcf1242 | 275 | score = 0; |
749c10f9 | 276 | if (t->parms.link != link) |
afcf1242 | 277 | score |= 1; |
749c10f9 | 278 | if (t->dev->type != dev_type) |
afcf1242 TT |
279 | score |= 2; |
280 | if (score == 0) | |
749c10f9 | 281 | return t; |
afcf1242 TT |
282 | |
283 | if (score < cand_score) { | |
284 | cand = t; | |
285 | cand_score = score; | |
286 | } | |
1da177e4 | 287 | } |
e1a80002 | 288 | |
8d5b2c08 | 289 | for_each_ip_tunnel_rcu(ign->tunnels_wc[h1]) { |
749c10f9 TT |
290 | if (t->parms.i_key != key || |
291 | !(t->dev->flags & IFF_UP)) | |
292 | continue; | |
293 | ||
294 | if (t->dev->type != ARPHRD_IPGRE && | |
295 | t->dev->type != dev_type) | |
296 | continue; | |
297 | ||
afcf1242 | 298 | score = 0; |
749c10f9 | 299 | if (t->parms.link != link) |
afcf1242 | 300 | score |= 1; |
749c10f9 | 301 | if (t->dev->type != dev_type) |
afcf1242 TT |
302 | score |= 2; |
303 | if (score == 0) | |
749c10f9 | 304 | return t; |
afcf1242 TT |
305 | |
306 | if (score < cand_score) { | |
307 | cand = t; | |
308 | cand_score = score; | |
309 | } | |
1da177e4 LT |
310 | } |
311 | ||
afcf1242 TT |
312 | if (cand != NULL) |
313 | return cand; | |
e1a80002 | 314 | |
8d5b2c08 ED |
315 | dev = ign->fb_tunnel_dev; |
316 | if (dev->flags & IFF_UP) | |
317 | return netdev_priv(dev); | |
749c10f9 | 318 | |
1da177e4 LT |
319 | return NULL; |
320 | } | |
321 | ||
1507850b | 322 | static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 323 | struct ip_tunnel_parm *parms) |
1da177e4 | 324 | { |
5056a1ef YH |
325 | __be32 remote = parms->iph.daddr; |
326 | __be32 local = parms->iph.saddr; | |
327 | __be32 key = parms->i_key; | |
1507850b | 328 | unsigned int h = HASH(key); |
1da177e4 LT |
329 | int prio = 0; |
330 | ||
331 | if (local) | |
332 | prio |= 1; | |
f97c1e0c | 333 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
334 | prio |= 2; |
335 | h ^= HASH(remote); | |
336 | } | |
337 | ||
eb8ce741 | 338 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
339 | } |
340 | ||
1507850b | 341 | static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign, |
f57e7d5a | 342 | struct ip_tunnel *t) |
5056a1ef | 343 | { |
f57e7d5a | 344 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
345 | } |
346 | ||
f57e7d5a | 347 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 348 | { |
1507850b | 349 | struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t); |
1da177e4 | 350 | |
1507850b | 351 | rcu_assign_pointer(t->next, rtnl_dereference(*tp)); |
8d5b2c08 | 352 | rcu_assign_pointer(*tp, t); |
1da177e4 LT |
353 | } |
354 | ||
f57e7d5a | 355 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 356 | { |
1507850b ED |
357 | struct ip_tunnel __rcu **tp; |
358 | struct ip_tunnel *iter; | |
359 | ||
360 | for (tp = ipgre_bucket(ign, t); | |
361 | (iter = rtnl_dereference(*tp)) != NULL; | |
362 | tp = &iter->next) { | |
363 | if (t == iter) { | |
364 | rcu_assign_pointer(*tp, t->next); | |
1da177e4 LT |
365 | break; |
366 | } | |
367 | } | |
368 | } | |
369 | ||
e1a80002 HX |
370 | static struct ip_tunnel *ipgre_tunnel_find(struct net *net, |
371 | struct ip_tunnel_parm *parms, | |
372 | int type) | |
1da177e4 | 373 | { |
d5a0a1e3 AV |
374 | __be32 remote = parms->iph.daddr; |
375 | __be32 local = parms->iph.saddr; | |
376 | __be32 key = parms->i_key; | |
749c10f9 | 377 | int link = parms->link; |
1507850b ED |
378 | struct ip_tunnel *t; |
379 | struct ip_tunnel __rcu **tp; | |
e1a80002 HX |
380 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
381 | ||
1507850b ED |
382 | for (tp = __ipgre_bucket(ign, parms); |
383 | (t = rtnl_dereference(*tp)) != NULL; | |
384 | tp = &t->next) | |
e1a80002 HX |
385 | if (local == t->parms.iph.saddr && |
386 | remote == t->parms.iph.daddr && | |
387 | key == t->parms.i_key && | |
749c10f9 | 388 | link == t->parms.link && |
e1a80002 HX |
389 | type == t->dev->type) |
390 | break; | |
391 | ||
392 | return t; | |
393 | } | |
394 | ||
1507850b | 395 | static struct ip_tunnel *ipgre_tunnel_locate(struct net *net, |
e1a80002 HX |
396 | struct ip_tunnel_parm *parms, int create) |
397 | { | |
398 | struct ip_tunnel *t, *nt; | |
1da177e4 | 399 | struct net_device *dev; |
1da177e4 | 400 | char name[IFNAMSIZ]; |
f57e7d5a | 401 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 402 | |
e1a80002 HX |
403 | t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE); |
404 | if (t || !create) | |
405 | return t; | |
1da177e4 LT |
406 | |
407 | if (parms->name[0]) | |
408 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 | 409 | else |
407d6fcb | 410 | strcpy(name, "gre%d"); |
1da177e4 LT |
411 | |
412 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
413 | if (!dev) | |
407d6fcb | 414 | return NULL; |
1da177e4 | 415 | |
0b67eceb PE |
416 | dev_net_set(dev, net); |
417 | ||
2941a486 | 418 | nt = netdev_priv(dev); |
1da177e4 | 419 | nt->parms = *parms; |
c19e654d | 420 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 421 | |
42aa9162 HX |
422 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
423 | ||
b37d428b PE |
424 | if (register_netdevice(dev) < 0) |
425 | goto failed_free; | |
1da177e4 | 426 | |
f2b3ee9e WB |
427 | /* Can use a lockless transmit, unless we generate output sequences */ |
428 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
429 | dev->features |= NETIF_F_LLTX; | |
430 | ||
1da177e4 | 431 | dev_hold(dev); |
f57e7d5a | 432 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
433 | return nt; |
434 | ||
b37d428b PE |
435 | failed_free: |
436 | free_netdev(dev); | |
1da177e4 LT |
437 | return NULL; |
438 | } | |
439 | ||
440 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
441 | { | |
f57e7d5a PE |
442 | struct net *net = dev_net(dev); |
443 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
444 | ||
445 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
446 | dev_put(dev); |
447 | } | |
448 | ||
449 | ||
450 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
451 | { | |
1da177e4 | 452 | |
071f92d0 | 453 | /* All the routers (except for Linux) return only |
1da177e4 LT |
454 | 8 bytes of packet payload. It means, that precise relaying of |
455 | ICMP in the real Internet is absolutely infeasible. | |
456 | ||
457 | Moreover, Cisco "wise men" put GRE key to the third word | |
458 | in GRE header. It makes impossible maintaining even soft state for keyed | |
459 | GRE tunnels with enabled checksum. Tell them "thank you". | |
460 | ||
461 | Well, I wonder, rfc1812 was written by Cisco employee, | |
bff52857 | 462 | what the hell these idiots break standards established |
463 | by themselves??? | |
1da177e4 LT |
464 | */ |
465 | ||
b71d1d42 | 466 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
d5a0a1e3 | 467 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 468 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
469 | const int type = icmp_hdr(skb)->type; |
470 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 471 | struct ip_tunnel *t; |
d5a0a1e3 | 472 | __be16 flags; |
1da177e4 LT |
473 | |
474 | flags = p[0]; | |
475 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
476 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
477 | return; | |
478 | if (flags&GRE_KEY) { | |
479 | grehlen += 4; | |
480 | if (flags&GRE_CSUM) | |
481 | grehlen += 4; | |
482 | } | |
483 | } | |
484 | ||
485 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
486 | if (skb_headlen(skb) < grehlen) | |
487 | return; | |
488 | ||
489 | switch (type) { | |
490 | default: | |
491 | case ICMP_PARAMETERPROB: | |
492 | return; | |
493 | ||
494 | case ICMP_DEST_UNREACH: | |
495 | switch (code) { | |
496 | case ICMP_SR_FAILED: | |
497 | case ICMP_PORT_UNREACH: | |
498 | /* Impossible event. */ | |
499 | return; | |
500 | case ICMP_FRAG_NEEDED: | |
501 | /* Soft state for pmtu is maintained by IP core. */ | |
502 | return; | |
503 | default: | |
504 | /* All others are translated to HOST_UNREACH. | |
505 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
506 | I believe they are just ether pollution. --ANK | |
507 | */ | |
508 | break; | |
509 | } | |
510 | break; | |
511 | case ICMP_TIME_EXCEEDED: | |
512 | if (code != ICMP_EXC_TTL) | |
513 | return; | |
514 | break; | |
515 | } | |
516 | ||
8d5b2c08 | 517 | rcu_read_lock(); |
749c10f9 | 518 | t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr, |
e1a80002 HX |
519 | flags & GRE_KEY ? |
520 | *(((__be32 *)p) + (grehlen / 4) - 1) : 0, | |
521 | p[1]); | |
f97c1e0c JP |
522 | if (t == NULL || t->parms.iph.daddr == 0 || |
523 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
524 | goto out; |
525 | ||
526 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
527 | goto out; | |
528 | ||
da6185d8 | 529 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
530 | t->err_count++; |
531 | else | |
532 | t->err_count = 1; | |
533 | t->err_time = jiffies; | |
534 | out: | |
8d5b2c08 | 535 | rcu_read_unlock(); |
1da177e4 LT |
536 | } |
537 | ||
b71d1d42 | 538 | static inline void ipgre_ecn_decapsulate(const struct iphdr *iph, struct sk_buff *skb) |
1da177e4 LT |
539 | { |
540 | if (INET_ECN_is_ce(iph->tos)) { | |
541 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 542 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 543 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 544 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
545 | } |
546 | } | |
547 | } | |
548 | ||
549 | static inline u8 | |
b71d1d42 | 550 | ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb) |
1da177e4 LT |
551 | { |
552 | u8 inner = 0; | |
553 | if (skb->protocol == htons(ETH_P_IP)) | |
554 | inner = old_iph->tos; | |
555 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
b71d1d42 | 556 | inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
557 | return INET_ECN_encapsulate(tos, inner); |
558 | } | |
559 | ||
560 | static int ipgre_rcv(struct sk_buff *skb) | |
561 | { | |
b71d1d42 | 562 | const struct iphdr *iph; |
1da177e4 | 563 | u8 *h; |
d5a0a1e3 | 564 | __be16 flags; |
d3bc23e7 | 565 | __sum16 csum = 0; |
d5a0a1e3 | 566 | __be32 key = 0; |
1da177e4 LT |
567 | u32 seqno = 0; |
568 | struct ip_tunnel *tunnel; | |
569 | int offset = 4; | |
e1a80002 | 570 | __be16 gre_proto; |
1da177e4 LT |
571 | |
572 | if (!pskb_may_pull(skb, 16)) | |
573 | goto drop_nolock; | |
574 | ||
eddc9ec5 | 575 | iph = ip_hdr(skb); |
1da177e4 | 576 | h = skb->data; |
d5a0a1e3 | 577 | flags = *(__be16*)h; |
1da177e4 LT |
578 | |
579 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
580 | /* - Version must be 0. | |
581 | - We do not support routing headers. | |
582 | */ | |
583 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
584 | goto drop_nolock; | |
585 | ||
586 | if (flags&GRE_CSUM) { | |
fb286bb2 | 587 | switch (skb->ip_summed) { |
84fa7933 | 588 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 589 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
590 | if (!csum) |
591 | break; | |
592 | /* fall through */ | |
593 | case CHECKSUM_NONE: | |
594 | skb->csum = 0; | |
595 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 596 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
597 | } |
598 | offset += 4; | |
599 | } | |
600 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 601 | key = *(__be32*)(h + offset); |
1da177e4 LT |
602 | offset += 4; |
603 | } | |
604 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 605 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
606 | offset += 4; |
607 | } | |
608 | } | |
609 | ||
e1a80002 HX |
610 | gre_proto = *(__be16 *)(h + 2); |
611 | ||
8d5b2c08 | 612 | rcu_read_lock(); |
749c10f9 | 613 | if ((tunnel = ipgre_tunnel_lookup(skb->dev, |
e1a80002 HX |
614 | iph->saddr, iph->daddr, key, |
615 | gre_proto))) { | |
e985aad7 | 616 | struct pcpu_tstats *tstats; |
addd68eb | 617 | |
1da177e4 LT |
618 | secpath_reset(skb); |
619 | ||
e1a80002 | 620 | skb->protocol = gre_proto; |
1da177e4 LT |
621 | /* WCCP version 1 and 2 protocol decoding. |
622 | * - Change protocol to IP | |
623 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
624 | */ | |
e1a80002 | 625 | if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) { |
496c98df | 626 | skb->protocol = htons(ETH_P_IP); |
e905a9ed | 627 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
628 | offset += 4; |
629 | } | |
630 | ||
1d069167 | 631 | skb->mac_header = skb->network_header; |
4209fb60 | 632 | __pskb_pull(skb, offset); |
9c70220b | 633 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
634 | skb->pkt_type = PACKET_HOST; |
635 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 636 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 637 | /* Looped back packet, drop it! */ |
c7537967 | 638 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 639 | goto drop; |
e985aad7 | 640 | tunnel->dev->stats.multicast++; |
1da177e4 LT |
641 | skb->pkt_type = PACKET_BROADCAST; |
642 | } | |
643 | #endif | |
644 | ||
645 | if (((flags&GRE_CSUM) && csum) || | |
646 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
e985aad7 ED |
647 | tunnel->dev->stats.rx_crc_errors++; |
648 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
649 | goto drop; |
650 | } | |
651 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
652 | if (!(flags&GRE_SEQ) || | |
653 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
e985aad7 ED |
654 | tunnel->dev->stats.rx_fifo_errors++; |
655 | tunnel->dev->stats.rx_errors++; | |
1da177e4 LT |
656 | goto drop; |
657 | } | |
658 | tunnel->i_seqno = seqno + 1; | |
659 | } | |
e1a80002 HX |
660 | |
661 | /* Warning: All skb pointers will be invalidated! */ | |
662 | if (tunnel->dev->type == ARPHRD_ETHER) { | |
663 | if (!pskb_may_pull(skb, ETH_HLEN)) { | |
e985aad7 ED |
664 | tunnel->dev->stats.rx_length_errors++; |
665 | tunnel->dev->stats.rx_errors++; | |
e1a80002 HX |
666 | goto drop; |
667 | } | |
668 | ||
669 | iph = ip_hdr(skb); | |
670 | skb->protocol = eth_type_trans(skb, tunnel->dev); | |
671 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
672 | } | |
673 | ||
e985aad7 ED |
674 | tstats = this_cpu_ptr(tunnel->dev->tstats); |
675 | tstats->rx_packets++; | |
676 | tstats->rx_bytes += skb->len; | |
677 | ||
678 | __skb_tunnel_rx(skb, tunnel->dev); | |
e1a80002 HX |
679 | |
680 | skb_reset_network_header(skb); | |
1da177e4 | 681 | ipgre_ecn_decapsulate(iph, skb); |
e1a80002 | 682 | |
caf586e5 | 683 | netif_rx(skb); |
8990f468 | 684 | |
8d5b2c08 | 685 | rcu_read_unlock(); |
8990f468 | 686 | return 0; |
1da177e4 | 687 | } |
45af08be | 688 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
689 | |
690 | drop: | |
8d5b2c08 | 691 | rcu_read_unlock(); |
1da177e4 LT |
692 | drop_nolock: |
693 | kfree_skb(skb); | |
a02cec21 | 694 | return 0; |
1da177e4 LT |
695 | } |
696 | ||
6fef4c0c | 697 | static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 698 | { |
2941a486 | 699 | struct ip_tunnel *tunnel = netdev_priv(dev); |
e985aad7 | 700 | struct pcpu_tstats *tstats; |
b71d1d42 ED |
701 | const struct iphdr *old_iph = ip_hdr(skb); |
702 | const struct iphdr *tiph; | |
cbb1e85f | 703 | struct flowi4 fl4; |
1da177e4 | 704 | u8 tos; |
d5a0a1e3 | 705 | __be16 df; |
1da177e4 | 706 | struct rtable *rt; /* Route to the other host */ |
1507850b | 707 | struct net_device *tdev; /* Device to other host */ |
1da177e4 | 708 | struct iphdr *iph; /* Our new IP header */ |
c2636b4d | 709 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 710 | int gre_hlen; |
d5a0a1e3 | 711 | __be32 dst; |
1da177e4 LT |
712 | int mtu; |
713 | ||
e1a80002 HX |
714 | if (dev->type == ARPHRD_ETHER) |
715 | IPCB(skb)->flags = 0; | |
716 | ||
717 | if (dev->header_ops && dev->type == ARPHRD_IPGRE) { | |
1da177e4 | 718 | gre_hlen = 0; |
b71d1d42 | 719 | tiph = (const struct iphdr *)skb->data; |
1da177e4 LT |
720 | } else { |
721 | gre_hlen = tunnel->hlen; | |
722 | tiph = &tunnel->parms.iph; | |
723 | } | |
724 | ||
725 | if ((dst = tiph->daddr) == 0) { | |
726 | /* NBMA tunnel */ | |
727 | ||
adf30907 | 728 | if (skb_dst(skb) == NULL) { |
e985aad7 | 729 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
730 | goto tx_error; |
731 | } | |
732 | ||
61d57f87 | 733 | if (skb->protocol == htons(ETH_P_IP)) { |
511c3f92 | 734 | rt = skb_rtable(skb); |
61d57f87 DM |
735 | dst = rt->rt_gateway; |
736 | } | |
dfd56b8b | 737 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 738 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
b71d1d42 | 739 | const struct in6_addr *addr6; |
0ec88662 DM |
740 | struct neighbour *neigh; |
741 | bool do_tx_error_icmp; | |
1da177e4 | 742 | int addr_type; |
1da177e4 | 743 | |
0ec88662 | 744 | neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
745 | if (neigh == NULL) |
746 | goto tx_error; | |
747 | ||
b71d1d42 | 748 | addr6 = (const struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
749 | addr_type = ipv6_addr_type(addr6); |
750 | ||
751 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 752 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
753 | addr_type = ipv6_addr_type(addr6); |
754 | } | |
755 | ||
756 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
0ec88662 DM |
757 | do_tx_error_icmp = true; |
758 | else { | |
759 | do_tx_error_icmp = false; | |
760 | dst = addr6->s6_addr32[3]; | |
761 | } | |
762 | neigh_release(neigh); | |
763 | if (do_tx_error_icmp) | |
1da177e4 | 764 | goto tx_error_icmp; |
1da177e4 LT |
765 | } |
766 | #endif | |
767 | else | |
768 | goto tx_error; | |
769 | } | |
770 | ||
771 | tos = tiph->tos; | |
ee686ca9 AJ |
772 | if (tos == 1) { |
773 | tos = 0; | |
1da177e4 LT |
774 | if (skb->protocol == htons(ETH_P_IP)) |
775 | tos = old_iph->tos; | |
dd4ba83d | 776 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 777 | tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph); |
1da177e4 LT |
778 | } |
779 | ||
cbb1e85f | 780 | rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr, |
78fbfd8a DM |
781 | tunnel->parms.o_key, RT_TOS(tos), |
782 | tunnel->parms.link); | |
783 | if (IS_ERR(rt)) { | |
784 | dev->stats.tx_carrier_errors++; | |
785 | goto tx_error; | |
1da177e4 | 786 | } |
d8d1f30b | 787 | tdev = rt->dst.dev; |
1da177e4 LT |
788 | |
789 | if (tdev == dev) { | |
790 | ip_rt_put(rt); | |
e985aad7 | 791 | dev->stats.collisions++; |
1da177e4 LT |
792 | goto tx_error; |
793 | } | |
794 | ||
795 | df = tiph->frag_off; | |
796 | if (df) | |
d8d1f30b | 797 | mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 | 798 | else |
adf30907 | 799 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 | 800 | |
adf30907 ED |
801 | if (skb_dst(skb)) |
802 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
803 | |
804 | if (skb->protocol == htons(ETH_P_IP)) { | |
805 | df |= (old_iph->frag_off&htons(IP_DF)); | |
806 | ||
807 | if ((old_iph->frag_off&htons(IP_DF)) && | |
808 | mtu < ntohs(old_iph->tot_len)) { | |
809 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
810 | ip_rt_put(rt); | |
811 | goto tx_error; | |
812 | } | |
813 | } | |
dfd56b8b | 814 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 815 | else if (skb->protocol == htons(ETH_P_IPV6)) { |
adf30907 | 816 | struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb); |
1da177e4 | 817 | |
adf30907 | 818 | if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) { |
f97c1e0c JP |
819 | if ((tunnel->parms.iph.daddr && |
820 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
821 | rt6->rt6i_dst.plen == 128) { |
822 | rt6->rt6i_flags |= RTF_MODIFIED; | |
defb3519 | 823 | dst_metric_set(skb_dst(skb), RTAX_MTU, mtu); |
1da177e4 LT |
824 | } |
825 | } | |
826 | ||
827 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
3ffe533c | 828 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
1da177e4 LT |
829 | ip_rt_put(rt); |
830 | goto tx_error; | |
831 | } | |
832 | } | |
833 | #endif | |
834 | ||
835 | if (tunnel->err_count > 0) { | |
da6185d8 WY |
836 | if (time_before(jiffies, |
837 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
838 | tunnel->err_count--; |
839 | ||
840 | dst_link_failure(skb); | |
841 | } else | |
842 | tunnel->err_count = 0; | |
843 | } | |
844 | ||
d8d1f30b | 845 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len; |
1da177e4 | 846 | |
cfbba49d PM |
847 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
848 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 | 849 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
805dc1d6 HX |
850 | if (max_headroom > dev->needed_headroom) |
851 | dev->needed_headroom = max_headroom; | |
1da177e4 LT |
852 | if (!new_skb) { |
853 | ip_rt_put(rt); | |
e985aad7 | 854 | dev->stats.tx_dropped++; |
1da177e4 | 855 | dev_kfree_skb(skb); |
6ed10654 | 856 | return NETDEV_TX_OK; |
1da177e4 LT |
857 | } |
858 | if (skb->sk) | |
859 | skb_set_owner_w(new_skb, skb->sk); | |
860 | dev_kfree_skb(skb); | |
861 | skb = new_skb; | |
eddc9ec5 | 862 | old_iph = ip_hdr(skb); |
1da177e4 LT |
863 | } |
864 | ||
64194c31 | 865 | skb_reset_transport_header(skb); |
e2d1bca7 ACM |
866 | skb_push(skb, gre_hlen); |
867 | skb_reset_network_header(skb); | |
1da177e4 | 868 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
869 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
870 | IPSKB_REROUTED); | |
adf30907 | 871 | skb_dst_drop(skb); |
d8d1f30b | 872 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
873 | |
874 | /* | |
875 | * Push down and install the IPIP header. | |
876 | */ | |
877 | ||
eddc9ec5 | 878 | iph = ip_hdr(skb); |
1da177e4 LT |
879 | iph->version = 4; |
880 | iph->ihl = sizeof(struct iphdr) >> 2; | |
881 | iph->frag_off = df; | |
882 | iph->protocol = IPPROTO_GRE; | |
883 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
cbb1e85f DM |
884 | iph->daddr = fl4.daddr; |
885 | iph->saddr = fl4.saddr; | |
1da177e4 LT |
886 | |
887 | if ((iph->ttl = tiph->ttl) == 0) { | |
888 | if (skb->protocol == htons(ETH_P_IP)) | |
889 | iph->ttl = old_iph->ttl; | |
dfd56b8b | 890 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 | 891 | else if (skb->protocol == htons(ETH_P_IPV6)) |
b71d1d42 | 892 | iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit; |
1da177e4 LT |
893 | #endif |
894 | else | |
323e126f | 895 | iph->ttl = ip4_dst_hoplimit(&rt->dst); |
1da177e4 LT |
896 | } |
897 | ||
e1a80002 HX |
898 | ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags; |
899 | ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ? | |
900 | htons(ETH_P_TEB) : skb->protocol; | |
1da177e4 LT |
901 | |
902 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 903 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
904 | |
905 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
906 | ++tunnel->o_seqno; | |
907 | *ptr = htonl(tunnel->o_seqno); | |
908 | ptr--; | |
909 | } | |
910 | if (tunnel->parms.o_flags&GRE_KEY) { | |
911 | *ptr = tunnel->parms.o_key; | |
912 | ptr--; | |
913 | } | |
914 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
915 | *ptr = 0; | |
5f92a738 | 916 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
917 | } |
918 | } | |
919 | ||
920 | nf_reset(skb); | |
e985aad7 ED |
921 | tstats = this_cpu_ptr(dev->tstats); |
922 | __IPTUNNEL_XMIT(tstats, &dev->stats); | |
6ed10654 | 923 | return NETDEV_TX_OK; |
1da177e4 | 924 | |
496053f4 | 925 | #if IS_ENABLED(CONFIG_IPV6) |
1da177e4 LT |
926 | tx_error_icmp: |
927 | dst_link_failure(skb); | |
496053f4 | 928 | #endif |
1da177e4 | 929 | tx_error: |
e985aad7 | 930 | dev->stats.tx_errors++; |
1da177e4 | 931 | dev_kfree_skb(skb); |
6ed10654 | 932 | return NETDEV_TX_OK; |
1da177e4 LT |
933 | } |
934 | ||
42aa9162 | 935 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
936 | { |
937 | struct net_device *tdev = NULL; | |
938 | struct ip_tunnel *tunnel; | |
b71d1d42 | 939 | const struct iphdr *iph; |
ee34c1eb MS |
940 | int hlen = LL_MAX_HEADER; |
941 | int mtu = ETH_DATA_LEN; | |
942 | int addend = sizeof(struct iphdr) + 4; | |
943 | ||
944 | tunnel = netdev_priv(dev); | |
945 | iph = &tunnel->parms.iph; | |
946 | ||
c95b819a | 947 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
948 | |
949 | if (iph->daddr) { | |
cbb1e85f DM |
950 | struct flowi4 fl4; |
951 | struct rtable *rt; | |
952 | ||
953 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
954 | iph->daddr, iph->saddr, | |
955 | tunnel->parms.o_key, | |
956 | RT_TOS(iph->tos), | |
957 | tunnel->parms.link); | |
b23dd4fe | 958 | if (!IS_ERR(rt)) { |
d8d1f30b | 959 | tdev = rt->dst.dev; |
ee34c1eb MS |
960 | ip_rt_put(rt); |
961 | } | |
e1a80002 HX |
962 | |
963 | if (dev->type != ARPHRD_ETHER) | |
964 | dev->flags |= IFF_POINTOPOINT; | |
ee34c1eb MS |
965 | } |
966 | ||
967 | if (!tdev && tunnel->parms.link) | |
96635522 | 968 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
969 | |
970 | if (tdev) { | |
c95b819a | 971 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
972 | mtu = tdev->mtu; |
973 | } | |
974 | dev->iflink = tunnel->parms.link; | |
975 | ||
976 | /* Precalculate GRE options length */ | |
977 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
978 | if (tunnel->parms.o_flags&GRE_CSUM) | |
979 | addend += 4; | |
980 | if (tunnel->parms.o_flags&GRE_KEY) | |
981 | addend += 4; | |
982 | if (tunnel->parms.o_flags&GRE_SEQ) | |
983 | addend += 4; | |
984 | } | |
c95b819a | 985 | dev->needed_headroom = addend + hlen; |
8cdb0456 | 986 | mtu -= dev->hard_header_len + addend; |
42aa9162 HX |
987 | |
988 | if (mtu < 68) | |
989 | mtu = 68; | |
990 | ||
ee34c1eb MS |
991 | tunnel->hlen = addend; |
992 | ||
42aa9162 | 993 | return mtu; |
ee34c1eb MS |
994 | } |
995 | ||
1da177e4 LT |
996 | static int |
997 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
998 | { | |
999 | int err = 0; | |
1000 | struct ip_tunnel_parm p; | |
1001 | struct ip_tunnel *t; | |
f57e7d5a PE |
1002 | struct net *net = dev_net(dev); |
1003 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
1004 | |
1005 | switch (cmd) { | |
1006 | case SIOCGETTUNNEL: | |
1007 | t = NULL; | |
7daa0004 | 1008 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1009 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
1010 | err = -EFAULT; | |
1011 | break; | |
1012 | } | |
f57e7d5a | 1013 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
1014 | } |
1015 | if (t == NULL) | |
2941a486 | 1016 | t = netdev_priv(dev); |
1da177e4 LT |
1017 | memcpy(&p, &t->parms, sizeof(p)); |
1018 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
1019 | err = -EFAULT; | |
1020 | break; | |
1021 | ||
1022 | case SIOCADDTUNNEL: | |
1023 | case SIOCCHGTUNNEL: | |
1024 | err = -EPERM; | |
1025 | if (!capable(CAP_NET_ADMIN)) | |
1026 | goto done; | |
1027 | ||
1028 | err = -EFAULT; | |
1029 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1030 | goto done; | |
1031 | ||
1032 | err = -EINVAL; | |
1033 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
1034 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
1035 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
1036 | goto done; | |
1037 | if (p.iph.ttl) | |
1038 | p.iph.frag_off |= htons(IP_DF); | |
1039 | ||
1040 | if (!(p.i_flags&GRE_KEY)) | |
1041 | p.i_key = 0; | |
1042 | if (!(p.o_flags&GRE_KEY)) | |
1043 | p.o_key = 0; | |
1044 | ||
f57e7d5a | 1045 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 1046 | |
7daa0004 | 1047 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
1048 | if (t != NULL) { |
1049 | if (t->dev != dev) { | |
1050 | err = -EEXIST; | |
1051 | break; | |
1052 | } | |
1053 | } else { | |
1507850b | 1054 | unsigned int nflags = 0; |
1da177e4 | 1055 | |
2941a486 | 1056 | t = netdev_priv(dev); |
1da177e4 | 1057 | |
f97c1e0c | 1058 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
1059 | nflags = IFF_BROADCAST; |
1060 | else if (p.iph.daddr) | |
1061 | nflags = IFF_POINTOPOINT; | |
1062 | ||
1063 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
1064 | err = -EINVAL; | |
1065 | break; | |
1066 | } | |
f57e7d5a | 1067 | ipgre_tunnel_unlink(ign, t); |
74b0b85b | 1068 | synchronize_net(); |
1da177e4 LT |
1069 | t->parms.iph.saddr = p.iph.saddr; |
1070 | t->parms.iph.daddr = p.iph.daddr; | |
1071 | t->parms.i_key = p.i_key; | |
1072 | t->parms.o_key = p.o_key; | |
1073 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1074 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 1075 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
1076 | netdev_state_change(dev); |
1077 | } | |
1078 | } | |
1079 | ||
1080 | if (t) { | |
1081 | err = 0; | |
1082 | if (cmd == SIOCCHGTUNNEL) { | |
1083 | t->parms.iph.ttl = p.iph.ttl; | |
1084 | t->parms.iph.tos = p.iph.tos; | |
1085 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
1086 | if (t->parms.link != p.link) { |
1087 | t->parms.link = p.link; | |
42aa9162 | 1088 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
1089 | netdev_state_change(dev); |
1090 | } | |
1da177e4 LT |
1091 | } |
1092 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
1093 | err = -EFAULT; | |
1094 | } else | |
1095 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1096 | break; | |
1097 | ||
1098 | case SIOCDELTUNNEL: | |
1099 | err = -EPERM; | |
1100 | if (!capable(CAP_NET_ADMIN)) | |
1101 | goto done; | |
1102 | ||
7daa0004 | 1103 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
1104 | err = -EFAULT; |
1105 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
1106 | goto done; | |
1107 | err = -ENOENT; | |
f57e7d5a | 1108 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
1109 | goto done; |
1110 | err = -EPERM; | |
7daa0004 | 1111 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
1112 | goto done; |
1113 | dev = t->dev; | |
1114 | } | |
22f8cde5 SH |
1115 | unregister_netdevice(dev); |
1116 | err = 0; | |
1da177e4 LT |
1117 | break; |
1118 | ||
1119 | default: | |
1120 | err = -EINVAL; | |
1121 | } | |
1122 | ||
1123 | done: | |
1124 | return err; | |
1125 | } | |
1126 | ||
1da177e4 LT |
1127 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1128 | { | |
2941a486 | 1129 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
1130 | if (new_mtu < 68 || |
1131 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
1132 | return -EINVAL; |
1133 | dev->mtu = new_mtu; | |
1134 | return 0; | |
1135 | } | |
1136 | ||
1da177e4 LT |
1137 | /* Nice toy. Unfortunately, useless in real life :-) |
1138 | It allows to construct virtual multiprotocol broadcast "LAN" | |
1139 | over the Internet, provided multicast routing is tuned. | |
1140 | ||
1141 | ||
1142 | I have no idea was this bicycle invented before me, | |
1143 | so that I had to set ARPHRD_IPGRE to a random value. | |
1144 | I have an impression, that Cisco could make something similar, | |
1145 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 1146 | |
1da177e4 LT |
1147 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
1148 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
1149 | ||
1150 | ping -t 255 224.66.66.66 | |
1151 | ||
1152 | If nobody answers, mbone does not work. | |
1153 | ||
1154 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
1155 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
1156 | ifconfig Universe up | |
1157 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1158 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1159 | ftp 10.66.66.66 | |
1160 | ... | |
1161 | ftp fec0:6666:6666::193.233.7.65 | |
1162 | ... | |
1163 | ||
1164 | */ | |
1165 | ||
3b04ddde SH |
1166 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1167 | unsigned short type, | |
1507850b | 1168 | const void *daddr, const void *saddr, unsigned int len) |
1da177e4 | 1169 | { |
2941a486 | 1170 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1171 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1172 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1173 | |
1174 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1175 | p[0] = t->parms.o_flags; | |
1176 | p[1] = htons(type); | |
1177 | ||
1178 | /* | |
e905a9ed | 1179 | * Set the source hardware address. |
1da177e4 | 1180 | */ |
e905a9ed | 1181 | |
1da177e4 LT |
1182 | if (saddr) |
1183 | memcpy(&iph->saddr, saddr, 4); | |
6d55cb91 | 1184 | if (daddr) |
1da177e4 | 1185 | memcpy(&iph->daddr, daddr, 4); |
6d55cb91 | 1186 | if (iph->daddr) |
1da177e4 | 1187 | return t->hlen; |
e905a9ed | 1188 | |
1da177e4 LT |
1189 | return -t->hlen; |
1190 | } | |
1191 | ||
6a5f44d7 TT |
1192 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1193 | { | |
b71d1d42 | 1194 | const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb); |
6a5f44d7 TT |
1195 | memcpy(haddr, &iph->saddr, 4); |
1196 | return 4; | |
1197 | } | |
1198 | ||
3b04ddde SH |
1199 | static const struct header_ops ipgre_header_ops = { |
1200 | .create = ipgre_header, | |
6a5f44d7 | 1201 | .parse = ipgre_header_parse, |
3b04ddde SH |
1202 | }; |
1203 | ||
6a5f44d7 | 1204 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1205 | static int ipgre_open(struct net_device *dev) |
1206 | { | |
2941a486 | 1207 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1208 | |
f97c1e0c | 1209 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
cbb1e85f DM |
1210 | struct flowi4 fl4; |
1211 | struct rtable *rt; | |
1212 | ||
1213 | rt = ip_route_output_gre(dev_net(dev), &fl4, | |
1214 | t->parms.iph.daddr, | |
1215 | t->parms.iph.saddr, | |
1216 | t->parms.o_key, | |
1217 | RT_TOS(t->parms.iph.tos), | |
1218 | t->parms.link); | |
b23dd4fe | 1219 | if (IS_ERR(rt)) |
1da177e4 | 1220 | return -EADDRNOTAVAIL; |
d8d1f30b | 1221 | dev = rt->dst.dev; |
1da177e4 | 1222 | ip_rt_put(rt); |
e5ed6399 | 1223 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1224 | return -EADDRNOTAVAIL; |
1225 | t->mlink = dev->ifindex; | |
e5ed6399 | 1226 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1227 | } |
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | static int ipgre_close(struct net_device *dev) | |
1232 | { | |
2941a486 | 1233 | struct ip_tunnel *t = netdev_priv(dev); |
b8c26a33 | 1234 | |
f97c1e0c | 1235 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1236 | struct in_device *in_dev; |
c346dca1 | 1237 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
8723e1b4 | 1238 | if (in_dev) |
1da177e4 | 1239 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); |
1da177e4 LT |
1240 | } |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | #endif | |
1245 | ||
b8c26a33 SH |
1246 | static const struct net_device_ops ipgre_netdev_ops = { |
1247 | .ndo_init = ipgre_tunnel_init, | |
1248 | .ndo_uninit = ipgre_tunnel_uninit, | |
1249 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
1250 | .ndo_open = ipgre_open, | |
1251 | .ndo_stop = ipgre_close, | |
1252 | #endif | |
1253 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1254 | .ndo_do_ioctl = ipgre_tunnel_ioctl, | |
1255 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1256 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1257 | }; |
1258 | ||
e985aad7 ED |
1259 | static void ipgre_dev_free(struct net_device *dev) |
1260 | { | |
1261 | free_percpu(dev->tstats); | |
1262 | free_netdev(dev); | |
1263 | } | |
1264 | ||
1da177e4 LT |
1265 | static void ipgre_tunnel_setup(struct net_device *dev) |
1266 | { | |
b8c26a33 | 1267 | dev->netdev_ops = &ipgre_netdev_ops; |
e985aad7 | 1268 | dev->destructor = ipgre_dev_free; |
1da177e4 LT |
1269 | |
1270 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1271 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1272 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1273 | dev->flags = IFF_NOARP; |
1274 | dev->iflink = 0; | |
1275 | dev->addr_len = 4; | |
0b67eceb | 1276 | dev->features |= NETIF_F_NETNS_LOCAL; |
108bfa89 | 1277 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | static int ipgre_tunnel_init(struct net_device *dev) | |
1281 | { | |
1da177e4 LT |
1282 | struct ip_tunnel *tunnel; |
1283 | struct iphdr *iph; | |
1da177e4 | 1284 | |
2941a486 | 1285 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1286 | iph = &tunnel->parms.iph; |
1287 | ||
1288 | tunnel->dev = dev; | |
1289 | strcpy(tunnel->parms.name, dev->name); | |
1290 | ||
1291 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1292 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1293 | ||
1da177e4 | 1294 | if (iph->daddr) { |
1da177e4 | 1295 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1296 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1297 | if (!iph->saddr) |
1298 | return -EINVAL; | |
1299 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1300 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1301 | } |
1302 | #endif | |
ee34c1eb | 1303 | } else |
6a5f44d7 | 1304 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1305 | |
e985aad7 ED |
1306 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1307 | if (!dev->tstats) | |
1308 | return -ENOMEM; | |
1309 | ||
1da177e4 LT |
1310 | return 0; |
1311 | } | |
1312 | ||
b8c26a33 | 1313 | static void ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1314 | { |
2941a486 | 1315 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1316 | struct iphdr *iph = &tunnel->parms.iph; |
1317 | ||
1318 | tunnel->dev = dev; | |
1319 | strcpy(tunnel->parms.name, dev->name); | |
1320 | ||
1321 | iph->version = 4; | |
1322 | iph->protocol = IPPROTO_GRE; | |
1323 | iph->ihl = 5; | |
1324 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1325 | ||
1326 | dev_hold(dev); | |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | ||
00959ade DK |
1330 | static const struct gre_protocol ipgre_protocol = { |
1331 | .handler = ipgre_rcv, | |
1332 | .err_handler = ipgre_err, | |
1da177e4 LT |
1333 | }; |
1334 | ||
eef6dd65 | 1335 | static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head) |
eb8ce741 PE |
1336 | { |
1337 | int prio; | |
1338 | ||
1339 | for (prio = 0; prio < 4; prio++) { | |
1340 | int h; | |
1341 | for (h = 0; h < HASH_SIZE; h++) { | |
1507850b ED |
1342 | struct ip_tunnel *t; |
1343 | ||
1344 | t = rtnl_dereference(ign->tunnels[prio][h]); | |
eef6dd65 ED |
1345 | |
1346 | while (t != NULL) { | |
1347 | unregister_netdevice_queue(t->dev, head); | |
1507850b | 1348 | t = rtnl_dereference(t->next); |
eef6dd65 | 1349 | } |
eb8ce741 PE |
1350 | } |
1351 | } | |
1352 | } | |
1353 | ||
2c8c1e72 | 1354 | static int __net_init ipgre_init_net(struct net *net) |
59a4c759 | 1355 | { |
cfb8fbf2 | 1356 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
59a4c759 | 1357 | int err; |
59a4c759 | 1358 | |
7daa0004 PE |
1359 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1360 | ipgre_tunnel_setup); | |
1361 | if (!ign->fb_tunnel_dev) { | |
1362 | err = -ENOMEM; | |
1363 | goto err_alloc_dev; | |
1364 | } | |
be77e593 | 1365 | dev_net_set(ign->fb_tunnel_dev, net); |
7daa0004 | 1366 | |
b8c26a33 | 1367 | ipgre_fb_tunnel_init(ign->fb_tunnel_dev); |
c19e654d | 1368 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1369 | |
1370 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1371 | goto err_reg_dev; | |
1372 | ||
3285ee3b ED |
1373 | rcu_assign_pointer(ign->tunnels_wc[0], |
1374 | netdev_priv(ign->fb_tunnel_dev)); | |
59a4c759 PE |
1375 | return 0; |
1376 | ||
7daa0004 | 1377 | err_reg_dev: |
3285ee3b | 1378 | ipgre_dev_free(ign->fb_tunnel_dev); |
7daa0004 | 1379 | err_alloc_dev: |
59a4c759 PE |
1380 | return err; |
1381 | } | |
1382 | ||
2c8c1e72 | 1383 | static void __net_exit ipgre_exit_net(struct net *net) |
59a4c759 PE |
1384 | { |
1385 | struct ipgre_net *ign; | |
eef6dd65 | 1386 | LIST_HEAD(list); |
59a4c759 PE |
1387 | |
1388 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1389 | rtnl_lock(); |
eef6dd65 ED |
1390 | ipgre_destroy_tunnels(ign, &list); |
1391 | unregister_netdevice_many(&list); | |
7daa0004 | 1392 | rtnl_unlock(); |
59a4c759 PE |
1393 | } |
1394 | ||
1395 | static struct pernet_operations ipgre_net_ops = { | |
1396 | .init = ipgre_init_net, | |
1397 | .exit = ipgre_exit_net, | |
cfb8fbf2 EB |
1398 | .id = &ipgre_net_id, |
1399 | .size = sizeof(struct ipgre_net), | |
59a4c759 | 1400 | }; |
1da177e4 | 1401 | |
c19e654d HX |
1402 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1403 | { | |
1404 | __be16 flags; | |
1405 | ||
1406 | if (!data) | |
1407 | return 0; | |
1408 | ||
1409 | flags = 0; | |
1410 | if (data[IFLA_GRE_IFLAGS]) | |
1411 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1412 | if (data[IFLA_GRE_OFLAGS]) | |
1413 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1414 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1415 | return -EINVAL; | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
e1a80002 HX |
1420 | static int ipgre_tap_validate(struct nlattr *tb[], struct nlattr *data[]) |
1421 | { | |
1422 | __be32 daddr; | |
1423 | ||
1424 | if (tb[IFLA_ADDRESS]) { | |
1425 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) | |
1426 | return -EINVAL; | |
1427 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) | |
1428 | return -EADDRNOTAVAIL; | |
1429 | } | |
1430 | ||
1431 | if (!data) | |
1432 | goto out; | |
1433 | ||
1434 | if (data[IFLA_GRE_REMOTE]) { | |
1435 | memcpy(&daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1436 | if (!daddr) | |
1437 | return -EINVAL; | |
1438 | } | |
1439 | ||
1440 | out: | |
1441 | return ipgre_tunnel_validate(tb, data); | |
1442 | } | |
1443 | ||
c19e654d HX |
1444 | static void ipgre_netlink_parms(struct nlattr *data[], |
1445 | struct ip_tunnel_parm *parms) | |
1446 | { | |
7bb82d92 | 1447 | memset(parms, 0, sizeof(*parms)); |
c19e654d HX |
1448 | |
1449 | parms->iph.protocol = IPPROTO_GRE; | |
1450 | ||
1451 | if (!data) | |
1452 | return; | |
1453 | ||
1454 | if (data[IFLA_GRE_LINK]) | |
1455 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1456 | ||
1457 | if (data[IFLA_GRE_IFLAGS]) | |
1458 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1459 | ||
1460 | if (data[IFLA_GRE_OFLAGS]) | |
1461 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1462 | ||
1463 | if (data[IFLA_GRE_IKEY]) | |
1464 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1465 | ||
1466 | if (data[IFLA_GRE_OKEY]) | |
1467 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1468 | ||
1469 | if (data[IFLA_GRE_LOCAL]) | |
4d74f8ba | 1470 | parms->iph.saddr = nla_get_be32(data[IFLA_GRE_LOCAL]); |
c19e654d HX |
1471 | |
1472 | if (data[IFLA_GRE_REMOTE]) | |
4d74f8ba | 1473 | parms->iph.daddr = nla_get_be32(data[IFLA_GRE_REMOTE]); |
c19e654d HX |
1474 | |
1475 | if (data[IFLA_GRE_TTL]) | |
1476 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1477 | ||
1478 | if (data[IFLA_GRE_TOS]) | |
1479 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1480 | ||
1481 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1482 | parms->iph.frag_off = htons(IP_DF); | |
1483 | } | |
1484 | ||
e1a80002 HX |
1485 | static int ipgre_tap_init(struct net_device *dev) |
1486 | { | |
1487 | struct ip_tunnel *tunnel; | |
1488 | ||
1489 | tunnel = netdev_priv(dev); | |
1490 | ||
1491 | tunnel->dev = dev; | |
1492 | strcpy(tunnel->parms.name, dev->name); | |
1493 | ||
1494 | ipgre_tunnel_bind_dev(dev); | |
1495 | ||
e985aad7 ED |
1496 | dev->tstats = alloc_percpu(struct pcpu_tstats); |
1497 | if (!dev->tstats) | |
1498 | return -ENOMEM; | |
1499 | ||
e1a80002 HX |
1500 | return 0; |
1501 | } | |
1502 | ||
b8c26a33 SH |
1503 | static const struct net_device_ops ipgre_tap_netdev_ops = { |
1504 | .ndo_init = ipgre_tap_init, | |
1505 | .ndo_uninit = ipgre_tunnel_uninit, | |
1506 | .ndo_start_xmit = ipgre_tunnel_xmit, | |
1507 | .ndo_set_mac_address = eth_mac_addr, | |
1508 | .ndo_validate_addr = eth_validate_addr, | |
1509 | .ndo_change_mtu = ipgre_tunnel_change_mtu, | |
e985aad7 | 1510 | .ndo_get_stats = ipgre_get_stats, |
b8c26a33 SH |
1511 | }; |
1512 | ||
e1a80002 HX |
1513 | static void ipgre_tap_setup(struct net_device *dev) |
1514 | { | |
1515 | ||
1516 | ether_setup(dev); | |
1517 | ||
2e9526b3 | 1518 | dev->netdev_ops = &ipgre_tap_netdev_ops; |
e985aad7 | 1519 | dev->destructor = ipgre_dev_free; |
e1a80002 HX |
1520 | |
1521 | dev->iflink = 0; | |
1522 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1523 | } | |
1524 | ||
81adee47 | 1525 | static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], |
c19e654d HX |
1526 | struct nlattr *data[]) |
1527 | { | |
1528 | struct ip_tunnel *nt; | |
1529 | struct net *net = dev_net(dev); | |
1530 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1531 | int mtu; | |
1532 | int err; | |
1533 | ||
1534 | nt = netdev_priv(dev); | |
1535 | ipgre_netlink_parms(data, &nt->parms); | |
1536 | ||
e1a80002 | 1537 | if (ipgre_tunnel_find(net, &nt->parms, dev->type)) |
c19e654d HX |
1538 | return -EEXIST; |
1539 | ||
e1a80002 | 1540 | if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS]) |
f2cedb63 | 1541 | eth_hw_addr_random(dev); |
e1a80002 | 1542 | |
c19e654d HX |
1543 | mtu = ipgre_tunnel_bind_dev(dev); |
1544 | if (!tb[IFLA_MTU]) | |
1545 | dev->mtu = mtu; | |
1546 | ||
b790e01a ED |
1547 | /* Can use a lockless transmit, unless we generate output sequences */ |
1548 | if (!(nt->parms.o_flags & GRE_SEQ)) | |
1549 | dev->features |= NETIF_F_LLTX; | |
1550 | ||
c19e654d HX |
1551 | err = register_netdevice(dev); |
1552 | if (err) | |
1553 | goto out; | |
1554 | ||
1555 | dev_hold(dev); | |
1556 | ipgre_tunnel_link(ign, nt); | |
1557 | ||
1558 | out: | |
1559 | return err; | |
1560 | } | |
1561 | ||
1562 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1563 | struct nlattr *data[]) | |
1564 | { | |
1565 | struct ip_tunnel *t, *nt; | |
1566 | struct net *net = dev_net(dev); | |
1567 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1568 | struct ip_tunnel_parm p; | |
1569 | int mtu; | |
1570 | ||
1571 | if (dev == ign->fb_tunnel_dev) | |
1572 | return -EINVAL; | |
1573 | ||
1574 | nt = netdev_priv(dev); | |
1575 | ipgre_netlink_parms(data, &p); | |
1576 | ||
1577 | t = ipgre_tunnel_locate(net, &p, 0); | |
1578 | ||
1579 | if (t) { | |
1580 | if (t->dev != dev) | |
1581 | return -EEXIST; | |
1582 | } else { | |
c19e654d HX |
1583 | t = nt; |
1584 | ||
2e9526b3 | 1585 | if (dev->type != ARPHRD_ETHER) { |
1507850b | 1586 | unsigned int nflags = 0; |
c19e654d | 1587 | |
2e9526b3 HX |
1588 | if (ipv4_is_multicast(p.iph.daddr)) |
1589 | nflags = IFF_BROADCAST; | |
1590 | else if (p.iph.daddr) | |
1591 | nflags = IFF_POINTOPOINT; | |
1592 | ||
1593 | if ((dev->flags ^ nflags) & | |
1594 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1595 | return -EINVAL; | |
1596 | } | |
c19e654d HX |
1597 | |
1598 | ipgre_tunnel_unlink(ign, t); | |
1599 | t->parms.iph.saddr = p.iph.saddr; | |
1600 | t->parms.iph.daddr = p.iph.daddr; | |
1601 | t->parms.i_key = p.i_key; | |
2e9526b3 HX |
1602 | if (dev->type != ARPHRD_ETHER) { |
1603 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1604 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1605 | } | |
c19e654d HX |
1606 | ipgre_tunnel_link(ign, t); |
1607 | netdev_state_change(dev); | |
1608 | } | |
1609 | ||
1610 | t->parms.o_key = p.o_key; | |
1611 | t->parms.iph.ttl = p.iph.ttl; | |
1612 | t->parms.iph.tos = p.iph.tos; | |
1613 | t->parms.iph.frag_off = p.iph.frag_off; | |
1614 | ||
1615 | if (t->parms.link != p.link) { | |
1616 | t->parms.link = p.link; | |
1617 | mtu = ipgre_tunnel_bind_dev(dev); | |
1618 | if (!tb[IFLA_MTU]) | |
1619 | dev->mtu = mtu; | |
1620 | netdev_state_change(dev); | |
1621 | } | |
1622 | ||
1623 | return 0; | |
1624 | } | |
1625 | ||
1626 | static size_t ipgre_get_size(const struct net_device *dev) | |
1627 | { | |
1628 | return | |
1629 | /* IFLA_GRE_LINK */ | |
1630 | nla_total_size(4) + | |
1631 | /* IFLA_GRE_IFLAGS */ | |
1632 | nla_total_size(2) + | |
1633 | /* IFLA_GRE_OFLAGS */ | |
1634 | nla_total_size(2) + | |
1635 | /* IFLA_GRE_IKEY */ | |
1636 | nla_total_size(4) + | |
1637 | /* IFLA_GRE_OKEY */ | |
1638 | nla_total_size(4) + | |
1639 | /* IFLA_GRE_LOCAL */ | |
1640 | nla_total_size(4) + | |
1641 | /* IFLA_GRE_REMOTE */ | |
1642 | nla_total_size(4) + | |
1643 | /* IFLA_GRE_TTL */ | |
1644 | nla_total_size(1) + | |
1645 | /* IFLA_GRE_TOS */ | |
1646 | nla_total_size(1) + | |
1647 | /* IFLA_GRE_PMTUDISC */ | |
1648 | nla_total_size(1) + | |
1649 | 0; | |
1650 | } | |
1651 | ||
1652 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1653 | { | |
1654 | struct ip_tunnel *t = netdev_priv(dev); | |
1655 | struct ip_tunnel_parm *p = &t->parms; | |
1656 | ||
1657 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1658 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1659 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
ba9e64b1 PM |
1660 | NLA_PUT_BE32(skb, IFLA_GRE_IKEY, p->i_key); |
1661 | NLA_PUT_BE32(skb, IFLA_GRE_OKEY, p->o_key); | |
4d74f8ba PM |
1662 | NLA_PUT_BE32(skb, IFLA_GRE_LOCAL, p->iph.saddr); |
1663 | NLA_PUT_BE32(skb, IFLA_GRE_REMOTE, p->iph.daddr); | |
c19e654d HX |
1664 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); |
1665 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1666 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1667 | ||
1668 | return 0; | |
1669 | ||
1670 | nla_put_failure: | |
1671 | return -EMSGSIZE; | |
1672 | } | |
1673 | ||
1674 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1675 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1676 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1677 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1678 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1679 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
4d74f8ba PM |
1680 | [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) }, |
1681 | [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
c19e654d HX |
1682 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, |
1683 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1684 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1685 | }; | |
1686 | ||
1687 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1688 | .kind = "gre", | |
1689 | .maxtype = IFLA_GRE_MAX, | |
1690 | .policy = ipgre_policy, | |
1691 | .priv_size = sizeof(struct ip_tunnel), | |
1692 | .setup = ipgre_tunnel_setup, | |
1693 | .validate = ipgre_tunnel_validate, | |
1694 | .newlink = ipgre_newlink, | |
1695 | .changelink = ipgre_changelink, | |
1696 | .get_size = ipgre_get_size, | |
1697 | .fill_info = ipgre_fill_info, | |
1698 | }; | |
1699 | ||
e1a80002 HX |
1700 | static struct rtnl_link_ops ipgre_tap_ops __read_mostly = { |
1701 | .kind = "gretap", | |
1702 | .maxtype = IFLA_GRE_MAX, | |
1703 | .policy = ipgre_policy, | |
1704 | .priv_size = sizeof(struct ip_tunnel), | |
1705 | .setup = ipgre_tap_setup, | |
1706 | .validate = ipgre_tap_validate, | |
1707 | .newlink = ipgre_newlink, | |
1708 | .changelink = ipgre_changelink, | |
1709 | .get_size = ipgre_get_size, | |
1710 | .fill_info = ipgre_fill_info, | |
1711 | }; | |
1712 | ||
1da177e4 LT |
1713 | /* |
1714 | * And now the modules code and kernel interface. | |
1715 | */ | |
1716 | ||
1717 | static int __init ipgre_init(void) | |
1718 | { | |
1719 | int err; | |
1720 | ||
058bd4d2 | 1721 | pr_info("GRE over IPv4 tunneling driver\n"); |
1da177e4 | 1722 | |
cfb8fbf2 | 1723 | err = register_pernet_device(&ipgre_net_ops); |
59a4c759 | 1724 | if (err < 0) |
c2892f02 AD |
1725 | return err; |
1726 | ||
00959ade | 1727 | err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 | 1728 | if (err < 0) { |
058bd4d2 | 1729 | pr_info("%s: can't add protocol\n", __func__); |
c2892f02 AD |
1730 | goto add_proto_failed; |
1731 | } | |
7daa0004 | 1732 | |
c19e654d HX |
1733 | err = rtnl_link_register(&ipgre_link_ops); |
1734 | if (err < 0) | |
1735 | goto rtnl_link_failed; | |
1736 | ||
e1a80002 HX |
1737 | err = rtnl_link_register(&ipgre_tap_ops); |
1738 | if (err < 0) | |
1739 | goto tap_ops_failed; | |
1740 | ||
c19e654d | 1741 | out: |
1da177e4 | 1742 | return err; |
c19e654d | 1743 | |
e1a80002 HX |
1744 | tap_ops_failed: |
1745 | rtnl_link_unregister(&ipgre_link_ops); | |
c19e654d | 1746 | rtnl_link_failed: |
00959ade | 1747 | gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO); |
c2892f02 AD |
1748 | add_proto_failed: |
1749 | unregister_pernet_device(&ipgre_net_ops); | |
c19e654d | 1750 | goto out; |
1da177e4 LT |
1751 | } |
1752 | ||
db44575f | 1753 | static void __exit ipgre_fini(void) |
1da177e4 | 1754 | { |
e1a80002 | 1755 | rtnl_link_unregister(&ipgre_tap_ops); |
c19e654d | 1756 | rtnl_link_unregister(&ipgre_link_ops); |
00959ade | 1757 | if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) |
058bd4d2 | 1758 | pr_info("%s: can't remove protocol\n", __func__); |
c2892f02 | 1759 | unregister_pernet_device(&ipgre_net_ops); |
1da177e4 LT |
1760 | } |
1761 | ||
1762 | module_init(ipgre_init); | |
1763 | module_exit(ipgre_fini); | |
1764 | MODULE_LICENSE("GPL"); | |
4d74f8ba PM |
1765 | MODULE_ALIAS_RTNL_LINK("gre"); |
1766 | MODULE_ALIAS_RTNL_LINK("gretap"); | |
8909c9ad | 1767 | MODULE_ALIAS_NETDEV("gre0"); |