Commit | Line | Data |
---|---|---|
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 | ||
4fc268d2 | 13 | #include <linux/capability.h> |
1da177e4 LT |
14 | #include <linux/module.h> |
15 | #include <linux/types.h> | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <asm/uaccess.h> | |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/in.h> | |
21 | #include <linux/tcp.h> | |
22 | #include <linux/udp.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/mroute.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/in6.h> | |
27 | #include <linux/inetdevice.h> | |
28 | #include <linux/igmp.h> | |
29 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 30 | #include <linux/if_ether.h> |
1da177e4 LT |
31 | |
32 | #include <net/sock.h> | |
33 | #include <net/ip.h> | |
34 | #include <net/icmp.h> | |
35 | #include <net/protocol.h> | |
36 | #include <net/ipip.h> | |
37 | #include <net/arp.h> | |
38 | #include <net/checksum.h> | |
39 | #include <net/dsfield.h> | |
40 | #include <net/inet_ecn.h> | |
41 | #include <net/xfrm.h> | |
59a4c759 PE |
42 | #include <net/net_namespace.h> |
43 | #include <net/netns/generic.h> | |
c19e654d | 44 | #include <net/rtnetlink.h> |
1da177e4 LT |
45 | |
46 | #ifdef CONFIG_IPV6 | |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #endif | |
51 | ||
52 | /* | |
53 | Problems & solutions | |
54 | -------------------- | |
55 | ||
56 | 1. The most important issue is detecting local dead loops. | |
57 | They would cause complete host lockup in transmit, which | |
58 | would be "resolved" by stack overflow or, if queueing is enabled, | |
59 | with infinite looping in net_bh. | |
60 | ||
61 | We cannot track such dead loops during route installation, | |
62 | it is infeasible task. The most general solutions would be | |
63 | to keep skb->encapsulation counter (sort of local ttl), | |
64 | and silently drop packet when it expires. It is the best | |
65 | solution, but it supposes maintaing new variable in ALL | |
66 | skb, even if no tunneling is used. | |
67 | ||
e905a9ed | 68 | Current solution: t->recursion lock breaks dead loops. It looks |
1da177e4 LT |
69 | like dev->tbusy flag, but I preferred new variable, because |
70 | the semantics is different. One day, when hard_start_xmit | |
71 | will be multithreaded we will have to use skb->encapsulation. | |
72 | ||
73 | ||
74 | ||
75 | 2. Networking dead loops would not kill routers, but would really | |
76 | kill network. IP hop limit plays role of "t->recursion" in this case, | |
77 | if we copy it from packet being encapsulated to upper header. | |
78 | It is very good solution, but it introduces two problems: | |
79 | ||
80 | - Routing protocols, using packets with ttl=1 (OSPF, RIP2), | |
81 | do not work over tunnels. | |
82 | - traceroute does not work. I planned to relay ICMP from tunnel, | |
83 | so that this problem would be solved and traceroute output | |
84 | would even more informative. This idea appeared to be wrong: | |
85 | only Linux complies to rfc1812 now (yes, guys, Linux is the only | |
86 | true router now :-)), all routers (at least, in neighbourhood of mine) | |
87 | return only 8 bytes of payload. It is the end. | |
88 | ||
89 | Hence, if we want that OSPF worked or traceroute said something reasonable, | |
90 | we should search for another solution. | |
91 | ||
92 | One of them is to parse packet trying to detect inner encapsulation | |
93 | made by our node. It is difficult or even impossible, especially, | |
94 | taking into account fragmentation. TO be short, tt is not solution at all. | |
95 | ||
96 | Current solution: The solution was UNEXPECTEDLY SIMPLE. | |
97 | We force DF flag on tunnels with preconfigured hop limit, | |
98 | that is ALL. :-) Well, it does not remove the problem completely, | |
99 | but exponential growth of network traffic is changed to linear | |
100 | (branches, that exceed pmtu are pruned) and tunnel mtu | |
101 | fastly degrades to value <68, where looping stops. | |
102 | Yes, it is not good if there exists a router in the loop, | |
103 | which does not force DF, even when encapsulating packets have DF set. | |
104 | But it is not our problem! Nobody could accuse us, we made | |
105 | all that we could make. Even if it is your gated who injected | |
106 | fatal route to network, even if it were you who configured | |
107 | fatal static route: you are innocent. :-) | |
108 | ||
109 | ||
110 | ||
111 | 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain | |
112 | practically identical code. It would be good to glue them | |
113 | together, but it is not very evident, how to make them modular. | |
114 | sit is integral part of IPv6, ipip and gre are naturally modular. | |
115 | We could extract common parts (hash table, ioctl etc) | |
116 | to a separate module (ip_tunnel.c). | |
117 | ||
118 | Alexey Kuznetsov. | |
119 | */ | |
120 | ||
c19e654d | 121 | static struct rtnl_link_ops ipgre_link_ops __read_mostly; |
1da177e4 LT |
122 | static int ipgre_tunnel_init(struct net_device *dev); |
123 | static void ipgre_tunnel_setup(struct net_device *dev); | |
42aa9162 | 124 | static int ipgre_tunnel_bind_dev(struct net_device *dev); |
1da177e4 LT |
125 | |
126 | /* Fallback tunnel: no source, no destination, no key, no options */ | |
127 | ||
128 | static int ipgre_fb_tunnel_init(struct net_device *dev); | |
129 | ||
eb8ce741 PE |
130 | #define HASH_SIZE 16 |
131 | ||
59a4c759 PE |
132 | static int ipgre_net_id; |
133 | struct ipgre_net { | |
eb8ce741 PE |
134 | struct ip_tunnel *tunnels[4][HASH_SIZE]; |
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] | |
1da177e4 LT |
163 | |
164 | static DEFINE_RWLOCK(ipgre_lock); | |
165 | ||
166 | /* Given src, dst and key, find appropriate for input tunnel. */ | |
167 | ||
f57e7d5a PE |
168 | static struct ip_tunnel * ipgre_tunnel_lookup(struct net *net, |
169 | __be32 remote, __be32 local, __be32 key) | |
1da177e4 LT |
170 | { |
171 | unsigned h0 = HASH(remote); | |
172 | unsigned h1 = HASH(key); | |
173 | struct ip_tunnel *t; | |
7daa0004 | 174 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 175 | |
eb8ce741 | 176 | for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 LT |
177 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
178 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) | |
179 | return t; | |
180 | } | |
181 | } | |
eb8ce741 | 182 | for (t = ign->tunnels_r[h0^h1]; t; t = t->next) { |
1da177e4 LT |
183 | if (remote == t->parms.iph.daddr) { |
184 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) | |
185 | return t; | |
186 | } | |
187 | } | |
eb8ce741 | 188 | for (t = ign->tunnels_l[h1]; t; t = t->next) { |
1da177e4 | 189 | if (local == t->parms.iph.saddr || |
f97c1e0c JP |
190 | (local == t->parms.iph.daddr && |
191 | ipv4_is_multicast(local))) { | |
1da177e4 LT |
192 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
193 | return t; | |
194 | } | |
195 | } | |
eb8ce741 | 196 | for (t = ign->tunnels_wc[h1]; t; t = t->next) { |
1da177e4 LT |
197 | if (t->parms.i_key == key && (t->dev->flags&IFF_UP)) |
198 | return t; | |
199 | } | |
200 | ||
7daa0004 PE |
201 | if (ign->fb_tunnel_dev->flags&IFF_UP) |
202 | return netdev_priv(ign->fb_tunnel_dev); | |
1da177e4 LT |
203 | return NULL; |
204 | } | |
205 | ||
f57e7d5a PE |
206 | static struct ip_tunnel **__ipgre_bucket(struct ipgre_net *ign, |
207 | struct ip_tunnel_parm *parms) | |
1da177e4 | 208 | { |
5056a1ef YH |
209 | __be32 remote = parms->iph.daddr; |
210 | __be32 local = parms->iph.saddr; | |
211 | __be32 key = parms->i_key; | |
1da177e4 LT |
212 | unsigned h = HASH(key); |
213 | int prio = 0; | |
214 | ||
215 | if (local) | |
216 | prio |= 1; | |
f97c1e0c | 217 | if (remote && !ipv4_is_multicast(remote)) { |
1da177e4 LT |
218 | prio |= 2; |
219 | h ^= HASH(remote); | |
220 | } | |
221 | ||
eb8ce741 | 222 | return &ign->tunnels[prio][h]; |
1da177e4 LT |
223 | } |
224 | ||
f57e7d5a PE |
225 | static inline struct ip_tunnel **ipgre_bucket(struct ipgre_net *ign, |
226 | struct ip_tunnel *t) | |
5056a1ef | 227 | { |
f57e7d5a | 228 | return __ipgre_bucket(ign, &t->parms); |
5056a1ef YH |
229 | } |
230 | ||
f57e7d5a | 231 | static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 | 232 | { |
f57e7d5a | 233 | struct ip_tunnel **tp = ipgre_bucket(ign, t); |
1da177e4 LT |
234 | |
235 | t->next = *tp; | |
236 | write_lock_bh(&ipgre_lock); | |
237 | *tp = t; | |
238 | write_unlock_bh(&ipgre_lock); | |
239 | } | |
240 | ||
f57e7d5a | 241 | static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t) |
1da177e4 LT |
242 | { |
243 | struct ip_tunnel **tp; | |
244 | ||
f57e7d5a | 245 | for (tp = ipgre_bucket(ign, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
246 | if (t == *tp) { |
247 | write_lock_bh(&ipgre_lock); | |
248 | *tp = t->next; | |
249 | write_unlock_bh(&ipgre_lock); | |
250 | break; | |
251 | } | |
252 | } | |
253 | } | |
254 | ||
f57e7d5a PE |
255 | static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, |
256 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 257 | { |
d5a0a1e3 AV |
258 | __be32 remote = parms->iph.daddr; |
259 | __be32 local = parms->iph.saddr; | |
260 | __be32 key = parms->i_key; | |
1da177e4 LT |
261 | struct ip_tunnel *t, **tp, *nt; |
262 | struct net_device *dev; | |
1da177e4 | 263 | char name[IFNAMSIZ]; |
f57e7d5a | 264 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); |
1da177e4 | 265 | |
f57e7d5a | 266 | for (tp = __ipgre_bucket(ign, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
267 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) { |
268 | if (key == t->parms.i_key) | |
269 | return t; | |
270 | } | |
271 | } | |
272 | if (!create) | |
273 | return NULL; | |
274 | ||
275 | if (parms->name[0]) | |
276 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
277 | else |
278 | sprintf(name, "gre%%d"); | |
1da177e4 LT |
279 | |
280 | dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup); | |
281 | if (!dev) | |
282 | return NULL; | |
283 | ||
0b67eceb PE |
284 | dev_net_set(dev, net); |
285 | ||
b37d428b PE |
286 | if (strchr(name, '%')) { |
287 | if (dev_alloc_name(dev, name) < 0) | |
288 | goto failed_free; | |
289 | } | |
290 | ||
2941a486 | 291 | nt = netdev_priv(dev); |
1da177e4 | 292 | nt->parms = *parms; |
c19e654d | 293 | dev->rtnl_link_ops = &ipgre_link_ops; |
1da177e4 | 294 | |
42aa9162 HX |
295 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
296 | ||
b37d428b PE |
297 | if (register_netdevice(dev) < 0) |
298 | goto failed_free; | |
1da177e4 | 299 | |
1da177e4 | 300 | dev_hold(dev); |
f57e7d5a | 301 | ipgre_tunnel_link(ign, nt); |
1da177e4 LT |
302 | return nt; |
303 | ||
b37d428b PE |
304 | failed_free: |
305 | free_netdev(dev); | |
1da177e4 LT |
306 | return NULL; |
307 | } | |
308 | ||
309 | static void ipgre_tunnel_uninit(struct net_device *dev) | |
310 | { | |
f57e7d5a PE |
311 | struct net *net = dev_net(dev); |
312 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
313 | ||
314 | ipgre_tunnel_unlink(ign, netdev_priv(dev)); | |
1da177e4 LT |
315 | dev_put(dev); |
316 | } | |
317 | ||
318 | ||
319 | static void ipgre_err(struct sk_buff *skb, u32 info) | |
320 | { | |
1da177e4 | 321 | |
071f92d0 | 322 | /* All the routers (except for Linux) return only |
1da177e4 LT |
323 | 8 bytes of packet payload. It means, that precise relaying of |
324 | ICMP in the real Internet is absolutely infeasible. | |
325 | ||
326 | Moreover, Cisco "wise men" put GRE key to the third word | |
327 | in GRE header. It makes impossible maintaining even soft state for keyed | |
328 | GRE tunnels with enabled checksum. Tell them "thank you". | |
329 | ||
330 | Well, I wonder, rfc1812 was written by Cisco employee, | |
331 | what the hell these idiots break standrads established | |
332 | by themself??? | |
333 | */ | |
334 | ||
335 | struct iphdr *iph = (struct iphdr*)skb->data; | |
d5a0a1e3 | 336 | __be16 *p = (__be16*)(skb->data+(iph->ihl<<2)); |
1da177e4 | 337 | int grehlen = (iph->ihl<<2) + 4; |
88c7664f ACM |
338 | const int type = icmp_hdr(skb)->type; |
339 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 340 | struct ip_tunnel *t; |
d5a0a1e3 | 341 | __be16 flags; |
1da177e4 LT |
342 | |
343 | flags = p[0]; | |
344 | if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) { | |
345 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
346 | return; | |
347 | if (flags&GRE_KEY) { | |
348 | grehlen += 4; | |
349 | if (flags&GRE_CSUM) | |
350 | grehlen += 4; | |
351 | } | |
352 | } | |
353 | ||
354 | /* If only 8 bytes returned, keyed message will be dropped here */ | |
355 | if (skb_headlen(skb) < grehlen) | |
356 | return; | |
357 | ||
358 | switch (type) { | |
359 | default: | |
360 | case ICMP_PARAMETERPROB: | |
361 | return; | |
362 | ||
363 | case ICMP_DEST_UNREACH: | |
364 | switch (code) { | |
365 | case ICMP_SR_FAILED: | |
366 | case ICMP_PORT_UNREACH: | |
367 | /* Impossible event. */ | |
368 | return; | |
369 | case ICMP_FRAG_NEEDED: | |
370 | /* Soft state for pmtu is maintained by IP core. */ | |
371 | return; | |
372 | default: | |
373 | /* All others are translated to HOST_UNREACH. | |
374 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
375 | I believe they are just ether pollution. --ANK | |
376 | */ | |
377 | break; | |
378 | } | |
379 | break; | |
380 | case ICMP_TIME_EXCEEDED: | |
381 | if (code != ICMP_EXC_TTL) | |
382 | return; | |
383 | break; | |
384 | } | |
385 | ||
386 | read_lock(&ipgre_lock); | |
3b4667f3 | 387 | t = ipgre_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr, |
f57e7d5a PE |
388 | (flags&GRE_KEY) ? |
389 | *(((__be32*)p) + (grehlen>>2) - 1) : 0); | |
f97c1e0c JP |
390 | if (t == NULL || t->parms.iph.daddr == 0 || |
391 | ipv4_is_multicast(t->parms.iph.daddr)) | |
1da177e4 LT |
392 | goto out; |
393 | ||
394 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
395 | goto out; | |
396 | ||
397 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
398 | t->err_count++; | |
399 | else | |
400 | t->err_count = 1; | |
401 | t->err_time = jiffies; | |
402 | out: | |
403 | read_unlock(&ipgre_lock); | |
404 | return; | |
1da177e4 LT |
405 | } |
406 | ||
407 | static inline void ipgre_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
408 | { | |
409 | if (INET_ECN_is_ce(iph->tos)) { | |
410 | if (skb->protocol == htons(ETH_P_IP)) { | |
eddc9ec5 | 411 | IP_ECN_set_ce(ip_hdr(skb)); |
1da177e4 | 412 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
0660e03f | 413 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
414 | } |
415 | } | |
416 | } | |
417 | ||
418 | static inline u8 | |
419 | ipgre_ecn_encapsulate(u8 tos, struct iphdr *old_iph, struct sk_buff *skb) | |
420 | { | |
421 | u8 inner = 0; | |
422 | if (skb->protocol == htons(ETH_P_IP)) | |
423 | inner = old_iph->tos; | |
424 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
425 | inner = ipv6_get_dsfield((struct ipv6hdr *)old_iph); | |
426 | return INET_ECN_encapsulate(tos, inner); | |
427 | } | |
428 | ||
429 | static int ipgre_rcv(struct sk_buff *skb) | |
430 | { | |
431 | struct iphdr *iph; | |
432 | u8 *h; | |
d5a0a1e3 | 433 | __be16 flags; |
d3bc23e7 | 434 | __sum16 csum = 0; |
d5a0a1e3 | 435 | __be32 key = 0; |
1da177e4 LT |
436 | u32 seqno = 0; |
437 | struct ip_tunnel *tunnel; | |
438 | int offset = 4; | |
439 | ||
440 | if (!pskb_may_pull(skb, 16)) | |
441 | goto drop_nolock; | |
442 | ||
eddc9ec5 | 443 | iph = ip_hdr(skb); |
1da177e4 | 444 | h = skb->data; |
d5a0a1e3 | 445 | flags = *(__be16*)h; |
1da177e4 LT |
446 | |
447 | if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) { | |
448 | /* - Version must be 0. | |
449 | - We do not support routing headers. | |
450 | */ | |
451 | if (flags&(GRE_VERSION|GRE_ROUTING)) | |
452 | goto drop_nolock; | |
453 | ||
454 | if (flags&GRE_CSUM) { | |
fb286bb2 | 455 | switch (skb->ip_summed) { |
84fa7933 | 456 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 457 | csum = csum_fold(skb->csum); |
fb286bb2 HX |
458 | if (!csum) |
459 | break; | |
460 | /* fall through */ | |
461 | case CHECKSUM_NONE: | |
462 | skb->csum = 0; | |
463 | csum = __skb_checksum_complete(skb); | |
84fa7933 | 464 | skb->ip_summed = CHECKSUM_COMPLETE; |
1da177e4 LT |
465 | } |
466 | offset += 4; | |
467 | } | |
468 | if (flags&GRE_KEY) { | |
d5a0a1e3 | 469 | key = *(__be32*)(h + offset); |
1da177e4 LT |
470 | offset += 4; |
471 | } | |
472 | if (flags&GRE_SEQ) { | |
d5a0a1e3 | 473 | seqno = ntohl(*(__be32*)(h + offset)); |
1da177e4 LT |
474 | offset += 4; |
475 | } | |
476 | } | |
477 | ||
478 | read_lock(&ipgre_lock); | |
3b4667f3 | 479 | if ((tunnel = ipgre_tunnel_lookup(dev_net(skb->dev), |
f57e7d5a | 480 | iph->saddr, iph->daddr, key)) != NULL) { |
addd68eb PE |
481 | struct net_device_stats *stats = &tunnel->dev->stats; |
482 | ||
1da177e4 LT |
483 | secpath_reset(skb); |
484 | ||
d5a0a1e3 | 485 | skb->protocol = *(__be16*)(h + 2); |
1da177e4 LT |
486 | /* WCCP version 1 and 2 protocol decoding. |
487 | * - Change protocol to IP | |
488 | * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header | |
489 | */ | |
490 | if (flags == 0 && | |
496c98df YH |
491 | skb->protocol == htons(ETH_P_WCCP)) { |
492 | skb->protocol = htons(ETH_P_IP); | |
e905a9ed | 493 | if ((*(h + offset) & 0xF0) != 0x40) |
1da177e4 LT |
494 | offset += 4; |
495 | } | |
496 | ||
1d069167 | 497 | skb->mac_header = skb->network_header; |
4209fb60 ACM |
498 | __pskb_pull(skb, offset); |
499 | skb_reset_network_header(skb); | |
9c70220b | 500 | skb_postpull_rcsum(skb, skb_transport_header(skb), offset); |
1da177e4 LT |
501 | skb->pkt_type = PACKET_HOST; |
502 | #ifdef CONFIG_NET_IPGRE_BROADCAST | |
f97c1e0c | 503 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 | 504 | /* Looped back packet, drop it! */ |
ee6b9673 | 505 | if (skb->rtable->fl.iif == 0) |
1da177e4 | 506 | goto drop; |
addd68eb | 507 | stats->multicast++; |
1da177e4 LT |
508 | skb->pkt_type = PACKET_BROADCAST; |
509 | } | |
510 | #endif | |
511 | ||
512 | if (((flags&GRE_CSUM) && csum) || | |
513 | (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) { | |
addd68eb PE |
514 | stats->rx_crc_errors++; |
515 | stats->rx_errors++; | |
1da177e4 LT |
516 | goto drop; |
517 | } | |
518 | if (tunnel->parms.i_flags&GRE_SEQ) { | |
519 | if (!(flags&GRE_SEQ) || | |
520 | (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) { | |
addd68eb PE |
521 | stats->rx_fifo_errors++; |
522 | stats->rx_errors++; | |
1da177e4 LT |
523 | goto drop; |
524 | } | |
525 | tunnel->i_seqno = seqno + 1; | |
526 | } | |
addd68eb PE |
527 | stats->rx_packets++; |
528 | stats->rx_bytes += skb->len; | |
1da177e4 LT |
529 | skb->dev = tunnel->dev; |
530 | dst_release(skb->dst); | |
531 | skb->dst = NULL; | |
532 | nf_reset(skb); | |
533 | ipgre_ecn_decapsulate(iph, skb); | |
534 | netif_rx(skb); | |
535 | read_unlock(&ipgre_lock); | |
536 | return(0); | |
537 | } | |
45af08be | 538 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
539 | |
540 | drop: | |
541 | read_unlock(&ipgre_lock); | |
542 | drop_nolock: | |
543 | kfree_skb(skb); | |
544 | return(0); | |
545 | } | |
546 | ||
547 | static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
548 | { | |
2941a486 | 549 | struct ip_tunnel *tunnel = netdev_priv(dev); |
addd68eb | 550 | struct net_device_stats *stats = &tunnel->dev->stats; |
eddc9ec5 | 551 | struct iphdr *old_iph = ip_hdr(skb); |
1da177e4 LT |
552 | struct iphdr *tiph; |
553 | u8 tos; | |
d5a0a1e3 | 554 | __be16 df; |
1da177e4 LT |
555 | struct rtable *rt; /* Route to the other host */ |
556 | struct net_device *tdev; /* Device to other host */ | |
557 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 558 | unsigned int max_headroom; /* The extra header space needed */ |
1da177e4 | 559 | int gre_hlen; |
d5a0a1e3 | 560 | __be32 dst; |
1da177e4 LT |
561 | int mtu; |
562 | ||
563 | if (tunnel->recursion++) { | |
addd68eb | 564 | stats->collisions++; |
1da177e4 LT |
565 | goto tx_error; |
566 | } | |
567 | ||
3b04ddde | 568 | if (dev->header_ops) { |
1da177e4 LT |
569 | gre_hlen = 0; |
570 | tiph = (struct iphdr*)skb->data; | |
571 | } else { | |
572 | gre_hlen = tunnel->hlen; | |
573 | tiph = &tunnel->parms.iph; | |
574 | } | |
575 | ||
576 | if ((dst = tiph->daddr) == 0) { | |
577 | /* NBMA tunnel */ | |
578 | ||
579 | if (skb->dst == NULL) { | |
addd68eb | 580 | stats->tx_fifo_errors++; |
1da177e4 LT |
581 | goto tx_error; |
582 | } | |
583 | ||
584 | if (skb->protocol == htons(ETH_P_IP)) { | |
ee6b9673 | 585 | rt = skb->rtable; |
1da177e4 LT |
586 | if ((dst = rt->rt_gateway) == 0) |
587 | goto tx_error_icmp; | |
588 | } | |
589 | #ifdef CONFIG_IPV6 | |
590 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
591 | struct in6_addr *addr6; | |
592 | int addr_type; | |
593 | struct neighbour *neigh = skb->dst->neighbour; | |
594 | ||
595 | if (neigh == NULL) | |
596 | goto tx_error; | |
597 | ||
598 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
599 | addr_type = ipv6_addr_type(addr6); | |
600 | ||
601 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 602 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
603 | addr_type = ipv6_addr_type(addr6); |
604 | } | |
605 | ||
606 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
607 | goto tx_error_icmp; | |
608 | ||
609 | dst = addr6->s6_addr32[3]; | |
610 | } | |
611 | #endif | |
612 | else | |
613 | goto tx_error; | |
614 | } | |
615 | ||
616 | tos = tiph->tos; | |
617 | if (tos&1) { | |
618 | if (skb->protocol == htons(ETH_P_IP)) | |
619 | tos = old_iph->tos; | |
620 | tos &= ~1; | |
621 | } | |
622 | ||
623 | { | |
624 | struct flowi fl = { .oif = tunnel->parms.link, | |
625 | .nl_u = { .ip4_u = | |
626 | { .daddr = dst, | |
627 | .saddr = tiph->saddr, | |
628 | .tos = RT_TOS(tos) } }, | |
629 | .proto = IPPROTO_GRE }; | |
96635522 | 630 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
addd68eb | 631 | stats->tx_carrier_errors++; |
1da177e4 LT |
632 | goto tx_error; |
633 | } | |
634 | } | |
635 | tdev = rt->u.dst.dev; | |
636 | ||
637 | if (tdev == dev) { | |
638 | ip_rt_put(rt); | |
addd68eb | 639 | stats->collisions++; |
1da177e4 LT |
640 | goto tx_error; |
641 | } | |
642 | ||
643 | df = tiph->frag_off; | |
644 | if (df) | |
c95b819a | 645 | mtu = dst_mtu(&rt->u.dst) - dev->hard_header_len - tunnel->hlen; |
1da177e4 LT |
646 | else |
647 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
648 | ||
649 | if (skb->dst) | |
650 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
651 | ||
652 | if (skb->protocol == htons(ETH_P_IP)) { | |
653 | df |= (old_iph->frag_off&htons(IP_DF)); | |
654 | ||
655 | if ((old_iph->frag_off&htons(IP_DF)) && | |
656 | mtu < ntohs(old_iph->tot_len)) { | |
657 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
658 | ip_rt_put(rt); | |
659 | goto tx_error; | |
660 | } | |
661 | } | |
662 | #ifdef CONFIG_IPV6 | |
663 | else if (skb->protocol == htons(ETH_P_IPV6)) { | |
664 | struct rt6_info *rt6 = (struct rt6_info*)skb->dst; | |
665 | ||
666 | if (rt6 && mtu < dst_mtu(skb->dst) && mtu >= IPV6_MIN_MTU) { | |
f97c1e0c JP |
667 | if ((tunnel->parms.iph.daddr && |
668 | !ipv4_is_multicast(tunnel->parms.iph.daddr)) || | |
1da177e4 LT |
669 | rt6->rt6i_dst.plen == 128) { |
670 | rt6->rt6i_flags |= RTF_MODIFIED; | |
671 | skb->dst->metrics[RTAX_MTU-1] = mtu; | |
672 | } | |
673 | } | |
674 | ||
675 | if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) { | |
676 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
677 | ip_rt_put(rt); | |
678 | goto tx_error; | |
679 | } | |
680 | } | |
681 | #endif | |
682 | ||
683 | if (tunnel->err_count > 0) { | |
684 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
685 | tunnel->err_count--; | |
686 | ||
687 | dst_link_failure(skb); | |
688 | } else | |
689 | tunnel->err_count = 0; | |
690 | } | |
691 | ||
692 | max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; | |
693 | ||
cfbba49d PM |
694 | if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| |
695 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
696 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
697 | if (!new_skb) { | |
698 | ip_rt_put(rt); | |
e905a9ed | 699 | stats->tx_dropped++; |
1da177e4 LT |
700 | dev_kfree_skb(skb); |
701 | tunnel->recursion--; | |
702 | return 0; | |
703 | } | |
704 | if (skb->sk) | |
705 | skb_set_owner_w(new_skb, skb->sk); | |
706 | dev_kfree_skb(skb); | |
707 | skb = new_skb; | |
eddc9ec5 | 708 | old_iph = ip_hdr(skb); |
1da177e4 LT |
709 | } |
710 | ||
b0e380b1 | 711 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
712 | skb_push(skb, gre_hlen); |
713 | skb_reset_network_header(skb); | |
1da177e4 | 714 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
48d5cad8 PM |
715 | IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED | |
716 | IPSKB_REROUTED); | |
1da177e4 LT |
717 | dst_release(skb->dst); |
718 | skb->dst = &rt->u.dst; | |
719 | ||
720 | /* | |
721 | * Push down and install the IPIP header. | |
722 | */ | |
723 | ||
eddc9ec5 | 724 | iph = ip_hdr(skb); |
1da177e4 LT |
725 | iph->version = 4; |
726 | iph->ihl = sizeof(struct iphdr) >> 2; | |
727 | iph->frag_off = df; | |
728 | iph->protocol = IPPROTO_GRE; | |
729 | iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb); | |
730 | iph->daddr = rt->rt_dst; | |
731 | iph->saddr = rt->rt_src; | |
732 | ||
733 | if ((iph->ttl = tiph->ttl) == 0) { | |
734 | if (skb->protocol == htons(ETH_P_IP)) | |
735 | iph->ttl = old_iph->ttl; | |
736 | #ifdef CONFIG_IPV6 | |
737 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
738 | iph->ttl = ((struct ipv6hdr*)old_iph)->hop_limit; | |
739 | #endif | |
740 | else | |
741 | iph->ttl = dst_metric(&rt->u.dst, RTAX_HOPLIMIT); | |
742 | } | |
743 | ||
d5a0a1e3 AV |
744 | ((__be16*)(iph+1))[0] = tunnel->parms.o_flags; |
745 | ((__be16*)(iph+1))[1] = skb->protocol; | |
1da177e4 LT |
746 | |
747 | if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) { | |
d5a0a1e3 | 748 | __be32 *ptr = (__be32*)(((u8*)iph) + tunnel->hlen - 4); |
1da177e4 LT |
749 | |
750 | if (tunnel->parms.o_flags&GRE_SEQ) { | |
751 | ++tunnel->o_seqno; | |
752 | *ptr = htonl(tunnel->o_seqno); | |
753 | ptr--; | |
754 | } | |
755 | if (tunnel->parms.o_flags&GRE_KEY) { | |
756 | *ptr = tunnel->parms.o_key; | |
757 | ptr--; | |
758 | } | |
759 | if (tunnel->parms.o_flags&GRE_CSUM) { | |
760 | *ptr = 0; | |
5f92a738 | 761 | *(__sum16*)ptr = ip_compute_csum((void*)(iph+1), skb->len - sizeof(struct iphdr)); |
1da177e4 LT |
762 | } |
763 | } | |
764 | ||
765 | nf_reset(skb); | |
766 | ||
767 | IPTUNNEL_XMIT(); | |
768 | tunnel->recursion--; | |
769 | return 0; | |
770 | ||
771 | tx_error_icmp: | |
772 | dst_link_failure(skb); | |
773 | ||
774 | tx_error: | |
775 | stats->tx_errors++; | |
776 | dev_kfree_skb(skb); | |
777 | tunnel->recursion--; | |
778 | return 0; | |
779 | } | |
780 | ||
42aa9162 | 781 | static int ipgre_tunnel_bind_dev(struct net_device *dev) |
ee34c1eb MS |
782 | { |
783 | struct net_device *tdev = NULL; | |
784 | struct ip_tunnel *tunnel; | |
785 | struct iphdr *iph; | |
786 | int hlen = LL_MAX_HEADER; | |
787 | int mtu = ETH_DATA_LEN; | |
788 | int addend = sizeof(struct iphdr) + 4; | |
789 | ||
790 | tunnel = netdev_priv(dev); | |
791 | iph = &tunnel->parms.iph; | |
792 | ||
c95b819a | 793 | /* Guess output device to choose reasonable mtu and needed_headroom */ |
ee34c1eb MS |
794 | |
795 | if (iph->daddr) { | |
796 | struct flowi fl = { .oif = tunnel->parms.link, | |
797 | .nl_u = { .ip4_u = | |
798 | { .daddr = iph->daddr, | |
799 | .saddr = iph->saddr, | |
800 | .tos = RT_TOS(iph->tos) } }, | |
801 | .proto = IPPROTO_GRE }; | |
802 | struct rtable *rt; | |
96635522 | 803 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
ee34c1eb MS |
804 | tdev = rt->u.dst.dev; |
805 | ip_rt_put(rt); | |
806 | } | |
807 | dev->flags |= IFF_POINTOPOINT; | |
808 | } | |
809 | ||
810 | if (!tdev && tunnel->parms.link) | |
96635522 | 811 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
ee34c1eb MS |
812 | |
813 | if (tdev) { | |
c95b819a | 814 | hlen = tdev->hard_header_len + tdev->needed_headroom; |
ee34c1eb MS |
815 | mtu = tdev->mtu; |
816 | } | |
817 | dev->iflink = tunnel->parms.link; | |
818 | ||
819 | /* Precalculate GRE options length */ | |
820 | if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) { | |
821 | if (tunnel->parms.o_flags&GRE_CSUM) | |
822 | addend += 4; | |
823 | if (tunnel->parms.o_flags&GRE_KEY) | |
824 | addend += 4; | |
825 | if (tunnel->parms.o_flags&GRE_SEQ) | |
826 | addend += 4; | |
827 | } | |
c95b819a | 828 | dev->needed_headroom = addend + hlen; |
42aa9162 HX |
829 | mtu -= dev->hard_header_len - addend; |
830 | ||
831 | if (mtu < 68) | |
832 | mtu = 68; | |
833 | ||
ee34c1eb MS |
834 | tunnel->hlen = addend; |
835 | ||
42aa9162 | 836 | return mtu; |
ee34c1eb MS |
837 | } |
838 | ||
1da177e4 LT |
839 | static int |
840 | ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
841 | { | |
842 | int err = 0; | |
843 | struct ip_tunnel_parm p; | |
844 | struct ip_tunnel *t; | |
f57e7d5a PE |
845 | struct net *net = dev_net(dev); |
846 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1da177e4 LT |
847 | |
848 | switch (cmd) { | |
849 | case SIOCGETTUNNEL: | |
850 | t = NULL; | |
7daa0004 | 851 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
852 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
853 | err = -EFAULT; | |
854 | break; | |
855 | } | |
f57e7d5a | 856 | t = ipgre_tunnel_locate(net, &p, 0); |
1da177e4 LT |
857 | } |
858 | if (t == NULL) | |
2941a486 | 859 | t = netdev_priv(dev); |
1da177e4 LT |
860 | memcpy(&p, &t->parms, sizeof(p)); |
861 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
862 | err = -EFAULT; | |
863 | break; | |
864 | ||
865 | case SIOCADDTUNNEL: | |
866 | case SIOCCHGTUNNEL: | |
867 | err = -EPERM; | |
868 | if (!capable(CAP_NET_ADMIN)) | |
869 | goto done; | |
870 | ||
871 | err = -EFAULT; | |
872 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
873 | goto done; | |
874 | ||
875 | err = -EINVAL; | |
876 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE || | |
877 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) || | |
878 | ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) | |
879 | goto done; | |
880 | if (p.iph.ttl) | |
881 | p.iph.frag_off |= htons(IP_DF); | |
882 | ||
883 | if (!(p.i_flags&GRE_KEY)) | |
884 | p.i_key = 0; | |
885 | if (!(p.o_flags&GRE_KEY)) | |
886 | p.o_key = 0; | |
887 | ||
f57e7d5a | 888 | t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 889 | |
7daa0004 | 890 | if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
891 | if (t != NULL) { |
892 | if (t->dev != dev) { | |
893 | err = -EEXIST; | |
894 | break; | |
895 | } | |
896 | } else { | |
897 | unsigned nflags=0; | |
898 | ||
2941a486 | 899 | t = netdev_priv(dev); |
1da177e4 | 900 | |
f97c1e0c | 901 | if (ipv4_is_multicast(p.iph.daddr)) |
1da177e4 LT |
902 | nflags = IFF_BROADCAST; |
903 | else if (p.iph.daddr) | |
904 | nflags = IFF_POINTOPOINT; | |
905 | ||
906 | if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) { | |
907 | err = -EINVAL; | |
908 | break; | |
909 | } | |
f57e7d5a | 910 | ipgre_tunnel_unlink(ign, t); |
1da177e4 LT |
911 | t->parms.iph.saddr = p.iph.saddr; |
912 | t->parms.iph.daddr = p.iph.daddr; | |
913 | t->parms.i_key = p.i_key; | |
914 | t->parms.o_key = p.o_key; | |
915 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
916 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
f57e7d5a | 917 | ipgre_tunnel_link(ign, t); |
1da177e4 LT |
918 | netdev_state_change(dev); |
919 | } | |
920 | } | |
921 | ||
922 | if (t) { | |
923 | err = 0; | |
924 | if (cmd == SIOCCHGTUNNEL) { | |
925 | t->parms.iph.ttl = p.iph.ttl; | |
926 | t->parms.iph.tos = p.iph.tos; | |
927 | t->parms.iph.frag_off = p.iph.frag_off; | |
ee34c1eb MS |
928 | if (t->parms.link != p.link) { |
929 | t->parms.link = p.link; | |
42aa9162 | 930 | dev->mtu = ipgre_tunnel_bind_dev(dev); |
ee34c1eb MS |
931 | netdev_state_change(dev); |
932 | } | |
1da177e4 LT |
933 | } |
934 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
935 | err = -EFAULT; | |
936 | } else | |
937 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
938 | break; | |
939 | ||
940 | case SIOCDELTUNNEL: | |
941 | err = -EPERM; | |
942 | if (!capable(CAP_NET_ADMIN)) | |
943 | goto done; | |
944 | ||
7daa0004 | 945 | if (dev == ign->fb_tunnel_dev) { |
1da177e4 LT |
946 | err = -EFAULT; |
947 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
948 | goto done; | |
949 | err = -ENOENT; | |
f57e7d5a | 950 | if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
951 | goto done; |
952 | err = -EPERM; | |
7daa0004 | 953 | if (t == netdev_priv(ign->fb_tunnel_dev)) |
1da177e4 LT |
954 | goto done; |
955 | dev = t->dev; | |
956 | } | |
22f8cde5 SH |
957 | unregister_netdevice(dev); |
958 | err = 0; | |
1da177e4 LT |
959 | break; |
960 | ||
961 | default: | |
962 | err = -EINVAL; | |
963 | } | |
964 | ||
965 | done: | |
966 | return err; | |
967 | } | |
968 | ||
1da177e4 LT |
969 | static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
970 | { | |
2941a486 | 971 | struct ip_tunnel *tunnel = netdev_priv(dev); |
c95b819a HX |
972 | if (new_mtu < 68 || |
973 | new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen) | |
1da177e4 LT |
974 | return -EINVAL; |
975 | dev->mtu = new_mtu; | |
976 | return 0; | |
977 | } | |
978 | ||
1da177e4 LT |
979 | /* Nice toy. Unfortunately, useless in real life :-) |
980 | It allows to construct virtual multiprotocol broadcast "LAN" | |
981 | over the Internet, provided multicast routing is tuned. | |
982 | ||
983 | ||
984 | I have no idea was this bicycle invented before me, | |
985 | so that I had to set ARPHRD_IPGRE to a random value. | |
986 | I have an impression, that Cisco could make something similar, | |
987 | but this feature is apparently missing in IOS<=11.2(8). | |
e905a9ed | 988 | |
1da177e4 LT |
989 | I set up 10.66.66/24 and fec0:6666:6666::0/96 as virtual networks |
990 | with broadcast 224.66.66.66. If you have access to mbone, play with me :-) | |
991 | ||
992 | ping -t 255 224.66.66.66 | |
993 | ||
994 | If nobody answers, mbone does not work. | |
995 | ||
996 | ip tunnel add Universe mode gre remote 224.66.66.66 local <Your_real_addr> ttl 255 | |
997 | ip addr add 10.66.66.<somewhat>/24 dev Universe | |
998 | ifconfig Universe up | |
999 | ifconfig Universe add fe80::<Your_real_addr>/10 | |
1000 | ifconfig Universe add fec0:6666:6666::<Your_real_addr>/96 | |
1001 | ftp 10.66.66.66 | |
1002 | ... | |
1003 | ftp fec0:6666:6666::193.233.7.65 | |
1004 | ... | |
1005 | ||
1006 | */ | |
1007 | ||
3b04ddde SH |
1008 | static int ipgre_header(struct sk_buff *skb, struct net_device *dev, |
1009 | unsigned short type, | |
1010 | const void *daddr, const void *saddr, unsigned len) | |
1da177e4 | 1011 | { |
2941a486 | 1012 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1013 | struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen); |
d5a0a1e3 | 1014 | __be16 *p = (__be16*)(iph+1); |
1da177e4 LT |
1015 | |
1016 | memcpy(iph, &t->parms.iph, sizeof(struct iphdr)); | |
1017 | p[0] = t->parms.o_flags; | |
1018 | p[1] = htons(type); | |
1019 | ||
1020 | /* | |
e905a9ed | 1021 | * Set the source hardware address. |
1da177e4 | 1022 | */ |
e905a9ed | 1023 | |
1da177e4 LT |
1024 | if (saddr) |
1025 | memcpy(&iph->saddr, saddr, 4); | |
1026 | ||
1027 | if (daddr) { | |
1028 | memcpy(&iph->daddr, daddr, 4); | |
1029 | return t->hlen; | |
1030 | } | |
f97c1e0c | 1031 | if (iph->daddr && !ipv4_is_multicast(iph->daddr)) |
1da177e4 | 1032 | return t->hlen; |
e905a9ed | 1033 | |
1da177e4 LT |
1034 | return -t->hlen; |
1035 | } | |
1036 | ||
6a5f44d7 TT |
1037 | static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr) |
1038 | { | |
1039 | struct iphdr *iph = (struct iphdr*) skb_mac_header(skb); | |
1040 | memcpy(haddr, &iph->saddr, 4); | |
1041 | return 4; | |
1042 | } | |
1043 | ||
3b04ddde SH |
1044 | static const struct header_ops ipgre_header_ops = { |
1045 | .create = ipgre_header, | |
6a5f44d7 | 1046 | .parse = ipgre_header_parse, |
3b04ddde SH |
1047 | }; |
1048 | ||
6a5f44d7 | 1049 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
1da177e4 LT |
1050 | static int ipgre_open(struct net_device *dev) |
1051 | { | |
2941a486 | 1052 | struct ip_tunnel *t = netdev_priv(dev); |
1da177e4 | 1053 | |
f97c1e0c | 1054 | if (ipv4_is_multicast(t->parms.iph.daddr)) { |
1da177e4 LT |
1055 | struct flowi fl = { .oif = t->parms.link, |
1056 | .nl_u = { .ip4_u = | |
1057 | { .daddr = t->parms.iph.daddr, | |
1058 | .saddr = t->parms.iph.saddr, | |
1059 | .tos = RT_TOS(t->parms.iph.tos) } }, | |
1060 | .proto = IPPROTO_GRE }; | |
1061 | struct rtable *rt; | |
96635522 | 1062 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) |
1da177e4 LT |
1063 | return -EADDRNOTAVAIL; |
1064 | dev = rt->u.dst.dev; | |
1065 | ip_rt_put(rt); | |
e5ed6399 | 1066 | if (__in_dev_get_rtnl(dev) == NULL) |
1da177e4 LT |
1067 | return -EADDRNOTAVAIL; |
1068 | t->mlink = dev->ifindex; | |
e5ed6399 | 1069 | ip_mc_inc_group(__in_dev_get_rtnl(dev), t->parms.iph.daddr); |
1da177e4 LT |
1070 | } |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | static int ipgre_close(struct net_device *dev) | |
1075 | { | |
2941a486 | 1076 | struct ip_tunnel *t = netdev_priv(dev); |
f97c1e0c | 1077 | if (ipv4_is_multicast(t->parms.iph.daddr) && t->mlink) { |
7fee0ca2 | 1078 | struct in_device *in_dev; |
c346dca1 | 1079 | in_dev = inetdev_by_index(dev_net(dev), t->mlink); |
1da177e4 LT |
1080 | if (in_dev) { |
1081 | ip_mc_dec_group(in_dev, t->parms.iph.daddr); | |
1082 | in_dev_put(in_dev); | |
1083 | } | |
1084 | } | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | #endif | |
1089 | ||
1090 | static void ipgre_tunnel_setup(struct net_device *dev) | |
1091 | { | |
c19e654d | 1092 | dev->init = ipgre_tunnel_init; |
1da177e4 LT |
1093 | dev->uninit = ipgre_tunnel_uninit; |
1094 | dev->destructor = free_netdev; | |
1095 | dev->hard_start_xmit = ipgre_tunnel_xmit; | |
1da177e4 LT |
1096 | dev->do_ioctl = ipgre_tunnel_ioctl; |
1097 | dev->change_mtu = ipgre_tunnel_change_mtu; | |
1098 | ||
1099 | dev->type = ARPHRD_IPGRE; | |
c95b819a | 1100 | dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4; |
46f25dff | 1101 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4; |
1da177e4 LT |
1102 | dev->flags = IFF_NOARP; |
1103 | dev->iflink = 0; | |
1104 | dev->addr_len = 4; | |
0b67eceb | 1105 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | static int ipgre_tunnel_init(struct net_device *dev) | |
1109 | { | |
1da177e4 LT |
1110 | struct ip_tunnel *tunnel; |
1111 | struct iphdr *iph; | |
1da177e4 | 1112 | |
2941a486 | 1113 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1114 | iph = &tunnel->parms.iph; |
1115 | ||
1116 | tunnel->dev = dev; | |
1117 | strcpy(tunnel->parms.name, dev->name); | |
1118 | ||
1119 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1120 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1121 | ||
1da177e4 | 1122 | if (iph->daddr) { |
1da177e4 | 1123 | #ifdef CONFIG_NET_IPGRE_BROADCAST |
f97c1e0c | 1124 | if (ipv4_is_multicast(iph->daddr)) { |
1da177e4 LT |
1125 | if (!iph->saddr) |
1126 | return -EINVAL; | |
1127 | dev->flags = IFF_BROADCAST; | |
3b04ddde | 1128 | dev->header_ops = &ipgre_header_ops; |
1da177e4 LT |
1129 | dev->open = ipgre_open; |
1130 | dev->stop = ipgre_close; | |
1131 | } | |
1132 | #endif | |
ee34c1eb | 1133 | } else |
6a5f44d7 | 1134 | dev->header_ops = &ipgre_header_ops; |
1da177e4 | 1135 | |
1da177e4 LT |
1136 | return 0; |
1137 | } | |
1138 | ||
7daa0004 | 1139 | static int ipgre_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1140 | { |
2941a486 | 1141 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1142 | struct iphdr *iph = &tunnel->parms.iph; |
eb8ce741 | 1143 | struct ipgre_net *ign = net_generic(dev_net(dev), ipgre_net_id); |
1da177e4 LT |
1144 | |
1145 | tunnel->dev = dev; | |
1146 | strcpy(tunnel->parms.name, dev->name); | |
1147 | ||
1148 | iph->version = 4; | |
1149 | iph->protocol = IPPROTO_GRE; | |
1150 | iph->ihl = 5; | |
1151 | tunnel->hlen = sizeof(struct iphdr) + 4; | |
1152 | ||
1153 | dev_hold(dev); | |
eb8ce741 | 1154 | ign->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1155 | return 0; |
1156 | } | |
1157 | ||
1158 | ||
1159 | static struct net_protocol ipgre_protocol = { | |
1160 | .handler = ipgre_rcv, | |
1161 | .err_handler = ipgre_err, | |
f96c148f | 1162 | .netns_ok = 1, |
1da177e4 LT |
1163 | }; |
1164 | ||
eb8ce741 PE |
1165 | static void ipgre_destroy_tunnels(struct ipgre_net *ign) |
1166 | { | |
1167 | int prio; | |
1168 | ||
1169 | for (prio = 0; prio < 4; prio++) { | |
1170 | int h; | |
1171 | for (h = 0; h < HASH_SIZE; h++) { | |
1172 | struct ip_tunnel *t; | |
1173 | while ((t = ign->tunnels[prio][h]) != NULL) | |
1174 | unregister_netdevice(t->dev); | |
1175 | } | |
1176 | } | |
1177 | } | |
1178 | ||
59a4c759 PE |
1179 | static int ipgre_init_net(struct net *net) |
1180 | { | |
1181 | int err; | |
1182 | struct ipgre_net *ign; | |
1183 | ||
1184 | err = -ENOMEM; | |
eb8ce741 | 1185 | ign = kzalloc(sizeof(struct ipgre_net), GFP_KERNEL); |
59a4c759 PE |
1186 | if (ign == NULL) |
1187 | goto err_alloc; | |
1188 | ||
1189 | err = net_assign_generic(net, ipgre_net_id, ign); | |
1190 | if (err < 0) | |
1191 | goto err_assign; | |
1192 | ||
7daa0004 PE |
1193 | ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0", |
1194 | ipgre_tunnel_setup); | |
1195 | if (!ign->fb_tunnel_dev) { | |
1196 | err = -ENOMEM; | |
1197 | goto err_alloc_dev; | |
1198 | } | |
1199 | ||
1200 | ign->fb_tunnel_dev->init = ipgre_fb_tunnel_init; | |
1201 | dev_net_set(ign->fb_tunnel_dev, net); | |
c19e654d | 1202 | ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops; |
7daa0004 PE |
1203 | |
1204 | if ((err = register_netdev(ign->fb_tunnel_dev))) | |
1205 | goto err_reg_dev; | |
1206 | ||
59a4c759 PE |
1207 | return 0; |
1208 | ||
7daa0004 PE |
1209 | err_reg_dev: |
1210 | free_netdev(ign->fb_tunnel_dev); | |
1211 | err_alloc_dev: | |
1212 | /* nothing */ | |
59a4c759 PE |
1213 | err_assign: |
1214 | kfree(ign); | |
1215 | err_alloc: | |
1216 | return err; | |
1217 | } | |
1218 | ||
1219 | static void ipgre_exit_net(struct net *net) | |
1220 | { | |
1221 | struct ipgre_net *ign; | |
1222 | ||
1223 | ign = net_generic(net, ipgre_net_id); | |
7daa0004 | 1224 | rtnl_lock(); |
eb8ce741 | 1225 | ipgre_destroy_tunnels(ign); |
7daa0004 | 1226 | rtnl_unlock(); |
59a4c759 PE |
1227 | kfree(ign); |
1228 | } | |
1229 | ||
1230 | static struct pernet_operations ipgre_net_ops = { | |
1231 | .init = ipgre_init_net, | |
1232 | .exit = ipgre_exit_net, | |
1233 | }; | |
1da177e4 | 1234 | |
c19e654d HX |
1235 | static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[]) |
1236 | { | |
1237 | __be16 flags; | |
1238 | ||
1239 | if (!data) | |
1240 | return 0; | |
1241 | ||
1242 | flags = 0; | |
1243 | if (data[IFLA_GRE_IFLAGS]) | |
1244 | flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1245 | if (data[IFLA_GRE_OFLAGS]) | |
1246 | flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1247 | if (flags & (GRE_VERSION|GRE_ROUTING)) | |
1248 | return -EINVAL; | |
1249 | ||
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | static void ipgre_netlink_parms(struct nlattr *data[], | |
1254 | struct ip_tunnel_parm *parms) | |
1255 | { | |
1256 | memset(parms, 0, sizeof(parms)); | |
1257 | ||
1258 | parms->iph.protocol = IPPROTO_GRE; | |
1259 | ||
1260 | if (!data) | |
1261 | return; | |
1262 | ||
1263 | if (data[IFLA_GRE_LINK]) | |
1264 | parms->link = nla_get_u32(data[IFLA_GRE_LINK]); | |
1265 | ||
1266 | if (data[IFLA_GRE_IFLAGS]) | |
1267 | parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]); | |
1268 | ||
1269 | if (data[IFLA_GRE_OFLAGS]) | |
1270 | parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]); | |
1271 | ||
1272 | if (data[IFLA_GRE_IKEY]) | |
1273 | parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]); | |
1274 | ||
1275 | if (data[IFLA_GRE_OKEY]) | |
1276 | parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]); | |
1277 | ||
1278 | if (data[IFLA_GRE_LOCAL]) | |
1279 | memcpy(&parms->iph.saddr, nla_data(data[IFLA_GRE_LOCAL]), 4); | |
1280 | ||
1281 | if (data[IFLA_GRE_REMOTE]) | |
1282 | memcpy(&parms->iph.daddr, nla_data(data[IFLA_GRE_REMOTE]), 4); | |
1283 | ||
1284 | if (data[IFLA_GRE_TTL]) | |
1285 | parms->iph.ttl = nla_get_u8(data[IFLA_GRE_TTL]); | |
1286 | ||
1287 | if (data[IFLA_GRE_TOS]) | |
1288 | parms->iph.tos = nla_get_u8(data[IFLA_GRE_TOS]); | |
1289 | ||
1290 | if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC])) | |
1291 | parms->iph.frag_off = htons(IP_DF); | |
1292 | } | |
1293 | ||
1294 | static int ipgre_newlink(struct net_device *dev, struct nlattr *tb[], | |
1295 | struct nlattr *data[]) | |
1296 | { | |
1297 | struct ip_tunnel *nt; | |
1298 | struct net *net = dev_net(dev); | |
1299 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1300 | int mtu; | |
1301 | int err; | |
1302 | ||
1303 | nt = netdev_priv(dev); | |
1304 | ipgre_netlink_parms(data, &nt->parms); | |
1305 | ||
1306 | if (ipgre_tunnel_locate(net, &nt->parms, 0)) | |
1307 | return -EEXIST; | |
1308 | ||
1309 | mtu = ipgre_tunnel_bind_dev(dev); | |
1310 | if (!tb[IFLA_MTU]) | |
1311 | dev->mtu = mtu; | |
1312 | ||
1313 | err = register_netdevice(dev); | |
1314 | if (err) | |
1315 | goto out; | |
1316 | ||
1317 | dev_hold(dev); | |
1318 | ipgre_tunnel_link(ign, nt); | |
1319 | ||
1320 | out: | |
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[], | |
1325 | struct nlattr *data[]) | |
1326 | { | |
1327 | struct ip_tunnel *t, *nt; | |
1328 | struct net *net = dev_net(dev); | |
1329 | struct ipgre_net *ign = net_generic(net, ipgre_net_id); | |
1330 | struct ip_tunnel_parm p; | |
1331 | int mtu; | |
1332 | ||
1333 | if (dev == ign->fb_tunnel_dev) | |
1334 | return -EINVAL; | |
1335 | ||
1336 | nt = netdev_priv(dev); | |
1337 | ipgre_netlink_parms(data, &p); | |
1338 | ||
1339 | t = ipgre_tunnel_locate(net, &p, 0); | |
1340 | ||
1341 | if (t) { | |
1342 | if (t->dev != dev) | |
1343 | return -EEXIST; | |
1344 | } else { | |
1345 | unsigned nflags = 0; | |
1346 | ||
1347 | t = nt; | |
1348 | ||
1349 | if (ipv4_is_multicast(p.iph.daddr)) | |
1350 | nflags = IFF_BROADCAST; | |
1351 | else if (p.iph.daddr) | |
1352 | nflags = IFF_POINTOPOINT; | |
1353 | ||
1354 | if ((dev->flags ^ nflags) & | |
1355 | (IFF_POINTOPOINT | IFF_BROADCAST)) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | ipgre_tunnel_unlink(ign, t); | |
1359 | t->parms.iph.saddr = p.iph.saddr; | |
1360 | t->parms.iph.daddr = p.iph.daddr; | |
1361 | t->parms.i_key = p.i_key; | |
1362 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
1363 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
1364 | ipgre_tunnel_link(ign, t); | |
1365 | netdev_state_change(dev); | |
1366 | } | |
1367 | ||
1368 | t->parms.o_key = p.o_key; | |
1369 | t->parms.iph.ttl = p.iph.ttl; | |
1370 | t->parms.iph.tos = p.iph.tos; | |
1371 | t->parms.iph.frag_off = p.iph.frag_off; | |
1372 | ||
1373 | if (t->parms.link != p.link) { | |
1374 | t->parms.link = p.link; | |
1375 | mtu = ipgre_tunnel_bind_dev(dev); | |
1376 | if (!tb[IFLA_MTU]) | |
1377 | dev->mtu = mtu; | |
1378 | netdev_state_change(dev); | |
1379 | } | |
1380 | ||
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static size_t ipgre_get_size(const struct net_device *dev) | |
1385 | { | |
1386 | return | |
1387 | /* IFLA_GRE_LINK */ | |
1388 | nla_total_size(4) + | |
1389 | /* IFLA_GRE_IFLAGS */ | |
1390 | nla_total_size(2) + | |
1391 | /* IFLA_GRE_OFLAGS */ | |
1392 | nla_total_size(2) + | |
1393 | /* IFLA_GRE_IKEY */ | |
1394 | nla_total_size(4) + | |
1395 | /* IFLA_GRE_OKEY */ | |
1396 | nla_total_size(4) + | |
1397 | /* IFLA_GRE_LOCAL */ | |
1398 | nla_total_size(4) + | |
1399 | /* IFLA_GRE_REMOTE */ | |
1400 | nla_total_size(4) + | |
1401 | /* IFLA_GRE_TTL */ | |
1402 | nla_total_size(1) + | |
1403 | /* IFLA_GRE_TOS */ | |
1404 | nla_total_size(1) + | |
1405 | /* IFLA_GRE_PMTUDISC */ | |
1406 | nla_total_size(1) + | |
1407 | 0; | |
1408 | } | |
1409 | ||
1410 | static int ipgre_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1411 | { | |
1412 | struct ip_tunnel *t = netdev_priv(dev); | |
1413 | struct ip_tunnel_parm *p = &t->parms; | |
1414 | ||
1415 | NLA_PUT_U32(skb, IFLA_GRE_LINK, p->link); | |
1416 | NLA_PUT_BE16(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1417 | NLA_PUT_BE16(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
1418 | NLA_PUT_BE32(skb, IFLA_GRE_IFLAGS, p->i_flags); | |
1419 | NLA_PUT_BE32(skb, IFLA_GRE_OFLAGS, p->o_flags); | |
1420 | NLA_PUT(skb, IFLA_GRE_LOCAL, 4, &p->iph.saddr); | |
1421 | NLA_PUT(skb, IFLA_GRE_REMOTE, 4, &p->iph.daddr); | |
1422 | NLA_PUT_U8(skb, IFLA_GRE_TTL, p->iph.ttl); | |
1423 | NLA_PUT_U8(skb, IFLA_GRE_TOS, p->iph.tos); | |
1424 | NLA_PUT_U8(skb, IFLA_GRE_PMTUDISC, !!(p->iph.frag_off & htons(IP_DF))); | |
1425 | ||
1426 | return 0; | |
1427 | ||
1428 | nla_put_failure: | |
1429 | return -EMSGSIZE; | |
1430 | } | |
1431 | ||
1432 | static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = { | |
1433 | [IFLA_GRE_LINK] = { .type = NLA_U32 }, | |
1434 | [IFLA_GRE_IFLAGS] = { .type = NLA_U16 }, | |
1435 | [IFLA_GRE_OFLAGS] = { .type = NLA_U16 }, | |
1436 | [IFLA_GRE_IKEY] = { .type = NLA_U32 }, | |
1437 | [IFLA_GRE_OKEY] = { .type = NLA_U32 }, | |
1438 | [IFLA_GRE_LOCAL] = { .len = 4 }, | |
1439 | [IFLA_GRE_REMOTE] = { .len = 4 }, | |
1440 | [IFLA_GRE_TTL] = { .type = NLA_U8 }, | |
1441 | [IFLA_GRE_TOS] = { .type = NLA_U8 }, | |
1442 | [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 }, | |
1443 | }; | |
1444 | ||
1445 | static struct rtnl_link_ops ipgre_link_ops __read_mostly = { | |
1446 | .kind = "gre", | |
1447 | .maxtype = IFLA_GRE_MAX, | |
1448 | .policy = ipgre_policy, | |
1449 | .priv_size = sizeof(struct ip_tunnel), | |
1450 | .setup = ipgre_tunnel_setup, | |
1451 | .validate = ipgre_tunnel_validate, | |
1452 | .newlink = ipgre_newlink, | |
1453 | .changelink = ipgre_changelink, | |
1454 | .get_size = ipgre_get_size, | |
1455 | .fill_info = ipgre_fill_info, | |
1456 | }; | |
1457 | ||
1da177e4 LT |
1458 | /* |
1459 | * And now the modules code and kernel interface. | |
1460 | */ | |
1461 | ||
1462 | static int __init ipgre_init(void) | |
1463 | { | |
1464 | int err; | |
1465 | ||
1466 | printk(KERN_INFO "GRE over IPv4 tunneling driver\n"); | |
1467 | ||
1468 | if (inet_add_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) { | |
1469 | printk(KERN_INFO "ipgre init: can't add protocol\n"); | |
1470 | return -EAGAIN; | |
1471 | } | |
1472 | ||
59a4c759 PE |
1473 | err = register_pernet_gen_device(&ipgre_net_id, &ipgre_net_ops); |
1474 | if (err < 0) | |
c19e654d | 1475 | goto gen_device_failed; |
7daa0004 | 1476 | |
c19e654d HX |
1477 | err = rtnl_link_register(&ipgre_link_ops); |
1478 | if (err < 0) | |
1479 | goto rtnl_link_failed; | |
1480 | ||
1481 | out: | |
1da177e4 | 1482 | return err; |
c19e654d HX |
1483 | |
1484 | rtnl_link_failed: | |
1485 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1486 | gen_device_failed: | |
1487 | inet_del_protocol(&ipgre_protocol, IPPROTO_GRE); | |
1488 | goto out; | |
1da177e4 LT |
1489 | } |
1490 | ||
db44575f | 1491 | static void __exit ipgre_fini(void) |
1da177e4 | 1492 | { |
c19e654d HX |
1493 | rtnl_link_unregister(&ipgre_link_ops); |
1494 | unregister_pernet_gen_device(ipgre_net_id, &ipgre_net_ops); | |
1da177e4 LT |
1495 | if (inet_del_protocol(&ipgre_protocol, IPPROTO_GRE) < 0) |
1496 | printk(KERN_INFO "ipgre close: can't remove protocol\n"); | |
1da177e4 LT |
1497 | } |
1498 | ||
1499 | module_init(ipgre_init); | |
1500 | module_exit(ipgre_fini); | |
1501 | MODULE_LICENSE("GPL"); | |
c19e654d | 1502 | MODULE_ALIAS("rtnl-link-gre"); |