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1 | /* | |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
8 | * | |
9 | * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $ | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * Changes: | |
17 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
18 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
19 | * Fred Templin <fred.l.templin@boeing.com>: isatap support | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/capability.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/netfilter_ipv4.h> | |
36 | #include <linux/if_ether.h> | |
37 | ||
38 | #include <net/sock.h> | |
39 | #include <net/snmp.h> | |
40 | ||
41 | #include <net/ipv6.h> | |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_fib.h> | |
45 | #include <net/ip6_route.h> | |
46 | #include <net/ndisc.h> | |
47 | #include <net/addrconf.h> | |
48 | #include <net/ip.h> | |
49 | #include <net/udp.h> | |
50 | #include <net/icmp.h> | |
51 | #include <net/ipip.h> | |
52 | #include <net/inet_ecn.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/dsfield.h> | |
55 | #include <net/net_namespace.h> | |
56 | #include <net/netns/generic.h> | |
57 | ||
58 | /* | |
59 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
60 | ||
61 | For comments look at net/ipv4/ip_gre.c --ANK | |
62 | */ | |
63 | ||
64 | #define HASH_SIZE 16 | |
65 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) | |
66 | ||
67 | static int ipip6_fb_tunnel_init(struct net_device *dev); | |
68 | static int ipip6_tunnel_init(struct net_device *dev); | |
69 | static void ipip6_tunnel_setup(struct net_device *dev); | |
70 | ||
71 | static int sit_net_id; | |
72 | struct sit_net { | |
73 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; | |
74 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
75 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
76 | struct ip_tunnel *tunnels_wc[1]; | |
77 | struct ip_tunnel **tunnels[4]; | |
78 | ||
79 | struct net_device *fb_tunnel_dev; | |
80 | }; | |
81 | ||
82 | static DEFINE_RWLOCK(ipip6_lock); | |
83 | ||
84 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, | |
85 | __be32 remote, __be32 local) | |
86 | { | |
87 | unsigned h0 = HASH(remote); | |
88 | unsigned h1 = HASH(local); | |
89 | struct ip_tunnel *t; | |
90 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
91 | ||
92 | for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { | |
93 | if (local == t->parms.iph.saddr && | |
94 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
95 | return t; | |
96 | } | |
97 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { | |
98 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
99 | return t; | |
100 | } | |
101 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { | |
102 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
103 | return t; | |
104 | } | |
105 | if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) | |
106 | return t; | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, | |
111 | struct ip_tunnel_parm *parms) | |
112 | { | |
113 | __be32 remote = parms->iph.daddr; | |
114 | __be32 local = parms->iph.saddr; | |
115 | unsigned h = 0; | |
116 | int prio = 0; | |
117 | ||
118 | if (remote) { | |
119 | prio |= 2; | |
120 | h ^= HASH(remote); | |
121 | } | |
122 | if (local) { | |
123 | prio |= 1; | |
124 | h ^= HASH(local); | |
125 | } | |
126 | return &sitn->tunnels[prio][h]; | |
127 | } | |
128 | ||
129 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, | |
130 | struct ip_tunnel *t) | |
131 | { | |
132 | return __ipip6_bucket(sitn, &t->parms); | |
133 | } | |
134 | ||
135 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) | |
136 | { | |
137 | struct ip_tunnel **tp; | |
138 | ||
139 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { | |
140 | if (t == *tp) { | |
141 | write_lock_bh(&ipip6_lock); | |
142 | *tp = t->next; | |
143 | write_unlock_bh(&ipip6_lock); | |
144 | break; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) | |
150 | { | |
151 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); | |
152 | ||
153 | t->next = *tp; | |
154 | write_lock_bh(&ipip6_lock); | |
155 | *tp = t; | |
156 | write_unlock_bh(&ipip6_lock); | |
157 | } | |
158 | ||
159 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, | |
160 | struct ip_tunnel_parm *parms, int create) | |
161 | { | |
162 | __be32 remote = parms->iph.daddr; | |
163 | __be32 local = parms->iph.saddr; | |
164 | struct ip_tunnel *t, **tp, *nt; | |
165 | struct net_device *dev; | |
166 | char name[IFNAMSIZ]; | |
167 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
168 | ||
169 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { | |
170 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) | |
171 | return t; | |
172 | } | |
173 | if (!create) | |
174 | goto failed; | |
175 | ||
176 | if (parms->name[0]) | |
177 | strlcpy(name, parms->name, IFNAMSIZ); | |
178 | else | |
179 | sprintf(name, "sit%%d"); | |
180 | ||
181 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
182 | if (dev == NULL) | |
183 | return NULL; | |
184 | ||
185 | dev_net_set(dev, net); | |
186 | ||
187 | if (strchr(name, '%')) { | |
188 | if (dev_alloc_name(dev, name) < 0) | |
189 | goto failed_free; | |
190 | } | |
191 | ||
192 | nt = netdev_priv(dev); | |
193 | dev->init = ipip6_tunnel_init; | |
194 | nt->parms = *parms; | |
195 | ||
196 | if (parms->i_flags & SIT_ISATAP) | |
197 | dev->priv_flags |= IFF_ISATAP; | |
198 | ||
199 | if (register_netdevice(dev) < 0) | |
200 | goto failed_free; | |
201 | ||
202 | dev_hold(dev); | |
203 | ||
204 | ipip6_tunnel_link(sitn, nt); | |
205 | return nt; | |
206 | ||
207 | failed_free: | |
208 | free_netdev(dev); | |
209 | failed: | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | static struct ip_tunnel_prl_entry * | |
214 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) | |
215 | { | |
216 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
217 | ||
218 | for (p = t->prl; p; p = p->next) | |
219 | if (p->addr == addr) | |
220 | break; | |
221 | return p; | |
222 | ||
223 | } | |
224 | ||
225 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
226 | { | |
227 | struct ip_tunnel_prl *kp; | |
228 | struct ip_tunnel_prl_entry *prl; | |
229 | unsigned int cmax, c = 0, ca, len; | |
230 | int ret = 0; | |
231 | ||
232 | cmax = a->datalen / sizeof(*a); | |
233 | if (cmax > 1 && a->addr != htonl(INADDR_ANY)) | |
234 | cmax = 1; | |
235 | ||
236 | /* For simple GET or for root users, | |
237 | * we try harder to allocate. | |
238 | */ | |
239 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
240 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
241 | NULL; | |
242 | ||
243 | read_lock(&ipip6_lock); | |
244 | ||
245 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
246 | ||
247 | if (!kp) { | |
248 | /* We don't try hard to allocate much memory for | |
249 | * non-root users. | |
250 | * For root users, retry allocating enough memory for | |
251 | * the answer. | |
252 | */ | |
253 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
254 | if (!kp) { | |
255 | ret = -ENOMEM; | |
256 | goto out; | |
257 | } | |
258 | } | |
259 | ||
260 | c = 0; | |
261 | for (prl = t->prl; prl; prl = prl->next) { | |
262 | if (c > cmax) | |
263 | break; | |
264 | if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr) | |
265 | continue; | |
266 | kp[c].addr = prl->addr; | |
267 | kp[c].flags = prl->flags; | |
268 | c++; | |
269 | if (a->addr != htonl(INADDR_ANY)) | |
270 | break; | |
271 | } | |
272 | out: | |
273 | read_unlock(&ipip6_lock); | |
274 | ||
275 | len = sizeof(*kp) * c; | |
276 | ret = len ? copy_to_user(a->data, kp, len) : 0; | |
277 | ||
278 | kfree(kp); | |
279 | if (ret) | |
280 | return -EFAULT; | |
281 | ||
282 | a->datalen = len; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static int | |
287 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
288 | { | |
289 | struct ip_tunnel_prl_entry *p; | |
290 | int err = 0; | |
291 | ||
292 | if (a->addr == htonl(INADDR_ANY)) | |
293 | return -EINVAL; | |
294 | ||
295 | write_lock(&ipip6_lock); | |
296 | ||
297 | for (p = t->prl; p; p = p->next) { | |
298 | if (p->addr == a->addr) { | |
299 | if (chg) | |
300 | goto update; | |
301 | err = -EEXIST; | |
302 | goto out; | |
303 | } | |
304 | } | |
305 | ||
306 | if (chg) { | |
307 | err = -ENXIO; | |
308 | goto out; | |
309 | } | |
310 | ||
311 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
312 | if (!p) { | |
313 | err = -ENOBUFS; | |
314 | goto out; | |
315 | } | |
316 | ||
317 | p->next = t->prl; | |
318 | t->prl = p; | |
319 | t->prl_count++; | |
320 | update: | |
321 | p->addr = a->addr; | |
322 | p->flags = a->flags; | |
323 | out: | |
324 | write_unlock(&ipip6_lock); | |
325 | return err; | |
326 | } | |
327 | ||
328 | static int | |
329 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
330 | { | |
331 | struct ip_tunnel_prl_entry *x, **p; | |
332 | int err = 0; | |
333 | ||
334 | write_lock(&ipip6_lock); | |
335 | ||
336 | if (a && a->addr != htonl(INADDR_ANY)) { | |
337 | for (p = &t->prl; *p; p = &(*p)->next) { | |
338 | if ((*p)->addr == a->addr) { | |
339 | x = *p; | |
340 | *p = x->next; | |
341 | kfree(x); | |
342 | t->prl_count--; | |
343 | goto out; | |
344 | } | |
345 | } | |
346 | err = -ENXIO; | |
347 | } else { | |
348 | while (t->prl) { | |
349 | x = t->prl; | |
350 | t->prl = t->prl->next; | |
351 | kfree(x); | |
352 | t->prl_count--; | |
353 | } | |
354 | } | |
355 | out: | |
356 | write_unlock(&ipip6_lock); | |
357 | return 0; | |
358 | } | |
359 | ||
360 | static int | |
361 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
362 | { | |
363 | struct ip_tunnel_prl_entry *p; | |
364 | int ok = 1; | |
365 | ||
366 | read_lock(&ipip6_lock); | |
367 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
368 | if (p) { | |
369 | if (p->flags & PRL_DEFAULT) | |
370 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; | |
371 | else | |
372 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
373 | } else { | |
374 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
375 | if (ipv6_addr_is_isatap(addr6) && | |
376 | (addr6->s6_addr32[3] == iph->saddr) && | |
377 | ipv6_chk_prefix(addr6, t->dev)) | |
378 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; | |
379 | else | |
380 | ok = 0; | |
381 | } | |
382 | read_unlock(&ipip6_lock); | |
383 | return ok; | |
384 | } | |
385 | ||
386 | static void ipip6_tunnel_uninit(struct net_device *dev) | |
387 | { | |
388 | struct net *net = dev_net(dev); | |
389 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
390 | ||
391 | if (dev == sitn->fb_tunnel_dev) { | |
392 | write_lock_bh(&ipip6_lock); | |
393 | sitn->tunnels_wc[0] = NULL; | |
394 | write_unlock_bh(&ipip6_lock); | |
395 | dev_put(dev); | |
396 | } else { | |
397 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); | |
398 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); | |
399 | dev_put(dev); | |
400 | } | |
401 | } | |
402 | ||
403 | ||
404 | static int ipip6_err(struct sk_buff *skb, u32 info) | |
405 | { | |
406 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
407 | ||
408 | /* It is not :-( All the routers (except for Linux) return only | |
409 | 8 bytes of packet payload. It means, that precise relaying of | |
410 | ICMP in the real Internet is absolutely infeasible. | |
411 | */ | |
412 | struct iphdr *iph = (struct iphdr*)skb->data; | |
413 | const int type = icmp_hdr(skb)->type; | |
414 | const int code = icmp_hdr(skb)->code; | |
415 | struct ip_tunnel *t; | |
416 | int err; | |
417 | ||
418 | switch (type) { | |
419 | default: | |
420 | case ICMP_PARAMETERPROB: | |
421 | return 0; | |
422 | ||
423 | case ICMP_DEST_UNREACH: | |
424 | switch (code) { | |
425 | case ICMP_SR_FAILED: | |
426 | case ICMP_PORT_UNREACH: | |
427 | /* Impossible event. */ | |
428 | return 0; | |
429 | case ICMP_FRAG_NEEDED: | |
430 | /* Soft state for pmtu is maintained by IP core. */ | |
431 | return 0; | |
432 | default: | |
433 | /* All others are translated to HOST_UNREACH. | |
434 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
435 | I believe they are just ether pollution. --ANK | |
436 | */ | |
437 | break; | |
438 | } | |
439 | break; | |
440 | case ICMP_TIME_EXCEEDED: | |
441 | if (code != ICMP_EXC_TTL) | |
442 | return 0; | |
443 | break; | |
444 | } | |
445 | ||
446 | err = -ENOENT; | |
447 | ||
448 | read_lock(&ipip6_lock); | |
449 | t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); | |
450 | if (t == NULL || t->parms.iph.daddr == 0) | |
451 | goto out; | |
452 | ||
453 | err = 0; | |
454 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) | |
455 | goto out; | |
456 | ||
457 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
458 | t->err_count++; | |
459 | else | |
460 | t->err_count = 1; | |
461 | t->err_time = jiffies; | |
462 | out: | |
463 | read_unlock(&ipip6_lock); | |
464 | return err; | |
465 | #else | |
466 | struct iphdr *iph = (struct iphdr*)dp; | |
467 | int hlen = iph->ihl<<2; | |
468 | struct ipv6hdr *iph6; | |
469 | const int type = icmp_hdr(skb)->type; | |
470 | const int code = icmp_hdr(skb)->code; | |
471 | int rel_type = 0; | |
472 | int rel_code = 0; | |
473 | int rel_info = 0; | |
474 | struct sk_buff *skb2; | |
475 | struct rt6_info *rt6i; | |
476 | ||
477 | if (len < hlen + sizeof(struct ipv6hdr)) | |
478 | return; | |
479 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
480 | ||
481 | switch (type) { | |
482 | default: | |
483 | return; | |
484 | case ICMP_PARAMETERPROB: | |
485 | if (icmp_hdr(skb)->un.gateway < hlen) | |
486 | return; | |
487 | ||
488 | /* So... This guy found something strange INSIDE encapsulated | |
489 | packet. Well, he is fool, but what can we do ? | |
490 | */ | |
491 | rel_type = ICMPV6_PARAMPROB; | |
492 | rel_info = icmp_hdr(skb)->un.gateway - hlen; | |
493 | break; | |
494 | ||
495 | case ICMP_DEST_UNREACH: | |
496 | switch (code) { | |
497 | case ICMP_SR_FAILED: | |
498 | case ICMP_PORT_UNREACH: | |
499 | /* Impossible event. */ | |
500 | return; | |
501 | case ICMP_FRAG_NEEDED: | |
502 | /* Too complicated case ... */ | |
503 | return; | |
504 | default: | |
505 | /* All others are translated to HOST_UNREACH. | |
506 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
507 | I believe, it is just ether pollution. --ANK | |
508 | */ | |
509 | rel_type = ICMPV6_DEST_UNREACH; | |
510 | rel_code = ICMPV6_ADDR_UNREACH; | |
511 | break; | |
512 | } | |
513 | break; | |
514 | case ICMP_TIME_EXCEEDED: | |
515 | if (code != ICMP_EXC_TTL) | |
516 | return; | |
517 | rel_type = ICMPV6_TIME_EXCEED; | |
518 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
519 | break; | |
520 | } | |
521 | ||
522 | /* Prepare fake skb to feed it to icmpv6_send */ | |
523 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
524 | if (skb2 == NULL) | |
525 | return 0; | |
526 | dst_release(skb2->dst); | |
527 | skb2->dst = NULL; | |
528 | skb_pull(skb2, skb->data - (u8*)iph6); | |
529 | skb_reset_network_header(skb2); | |
530 | ||
531 | /* Try to guess incoming interface */ | |
532 | rt6i = rt6_lookup(dev_net(skb->dev), &iph6->saddr, NULL, NULL, 0); | |
533 | if (rt6i && rt6i->rt6i_dev) { | |
534 | skb2->dev = rt6i->rt6i_dev; | |
535 | ||
536 | rt6i = rt6_lookup(dev_net(skb->dev), | |
537 | &iph6->daddr, &iph6->saddr, NULL, 0); | |
538 | ||
539 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
540 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); | |
541 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { | |
542 | rel_type = ICMPV6_DEST_UNREACH; | |
543 | rel_code = ICMPV6_ADDR_UNREACH; | |
544 | } | |
545 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
546 | } | |
547 | } | |
548 | kfree_skb(skb2); | |
549 | return 0; | |
550 | #endif | |
551 | } | |
552 | ||
553 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
554 | { | |
555 | if (INET_ECN_is_ce(iph->tos)) | |
556 | IP6_ECN_set_ce(ipv6_hdr(skb)); | |
557 | } | |
558 | ||
559 | static int ipip6_rcv(struct sk_buff *skb) | |
560 | { | |
561 | struct iphdr *iph; | |
562 | struct ip_tunnel *tunnel; | |
563 | ||
564 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
565 | goto out; | |
566 | ||
567 | iph = ip_hdr(skb); | |
568 | ||
569 | read_lock(&ipip6_lock); | |
570 | if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), | |
571 | iph->saddr, iph->daddr)) != NULL) { | |
572 | secpath_reset(skb); | |
573 | skb->mac_header = skb->network_header; | |
574 | skb_reset_network_header(skb); | |
575 | IPCB(skb)->flags = 0; | |
576 | skb->protocol = htons(ETH_P_IPV6); | |
577 | skb->pkt_type = PACKET_HOST; | |
578 | ||
579 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
580 | !isatap_chksrc(skb, iph, tunnel)) { | |
581 | tunnel->stat.rx_errors++; | |
582 | read_unlock(&ipip6_lock); | |
583 | kfree_skb(skb); | |
584 | return 0; | |
585 | } | |
586 | tunnel->stat.rx_packets++; | |
587 | tunnel->stat.rx_bytes += skb->len; | |
588 | skb->dev = tunnel->dev; | |
589 | dst_release(skb->dst); | |
590 | skb->dst = NULL; | |
591 | nf_reset(skb); | |
592 | ipip6_ecn_decapsulate(iph, skb); | |
593 | netif_rx(skb); | |
594 | read_unlock(&ipip6_lock); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
599 | kfree_skb(skb); | |
600 | read_unlock(&ipip6_lock); | |
601 | out: | |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* Returns the embedded IPv4 address if the IPv6 address | |
606 | comes from 6to4 (RFC 3056) addr space */ | |
607 | ||
608 | static inline __be32 try_6to4(struct in6_addr *v6dst) | |
609 | { | |
610 | __be32 dst = 0; | |
611 | ||
612 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
613 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ | |
614 | memcpy(&dst, &v6dst->s6_addr16[1], 4); | |
615 | } | |
616 | return dst; | |
617 | } | |
618 | ||
619 | /* | |
620 | * This function assumes it is being called from dev_queue_xmit() | |
621 | * and that skb is filled properly by that function. | |
622 | */ | |
623 | ||
624 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
625 | { | |
626 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
627 | struct net_device_stats *stats = &tunnel->stat; | |
628 | struct iphdr *tiph = &tunnel->parms.iph; | |
629 | struct ipv6hdr *iph6 = ipv6_hdr(skb); | |
630 | u8 tos = tunnel->parms.iph.tos; | |
631 | struct rtable *rt; /* Route to the other host */ | |
632 | struct net_device *tdev; /* Device to other host */ | |
633 | struct iphdr *iph; /* Our new IP header */ | |
634 | unsigned int max_headroom; /* The extra header space needed */ | |
635 | __be32 dst = tiph->daddr; | |
636 | int mtu; | |
637 | struct in6_addr *addr6; | |
638 | int addr_type; | |
639 | ||
640 | if (tunnel->recursion++) { | |
641 | tunnel->stat.collisions++; | |
642 | goto tx_error; | |
643 | } | |
644 | ||
645 | if (skb->protocol != htons(ETH_P_IPV6)) | |
646 | goto tx_error; | |
647 | ||
648 | /* ISATAP (RFC4214) - must come before 6to4 */ | |
649 | if (dev->priv_flags & IFF_ISATAP) { | |
650 | struct neighbour *neigh = NULL; | |
651 | ||
652 | if (skb->dst) | |
653 | neigh = skb->dst->neighbour; | |
654 | ||
655 | if (neigh == NULL) { | |
656 | if (net_ratelimit()) | |
657 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
658 | goto tx_error; | |
659 | } | |
660 | ||
661 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
662 | addr_type = ipv6_addr_type(addr6); | |
663 | ||
664 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
665 | ipv6_addr_is_isatap(addr6)) | |
666 | dst = addr6->s6_addr32[3]; | |
667 | else | |
668 | goto tx_error; | |
669 | } | |
670 | ||
671 | if (!dst) | |
672 | dst = try_6to4(&iph6->daddr); | |
673 | ||
674 | if (!dst) { | |
675 | struct neighbour *neigh = NULL; | |
676 | ||
677 | if (skb->dst) | |
678 | neigh = skb->dst->neighbour; | |
679 | ||
680 | if (neigh == NULL) { | |
681 | if (net_ratelimit()) | |
682 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
683 | goto tx_error; | |
684 | } | |
685 | ||
686 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
687 | addr_type = ipv6_addr_type(addr6); | |
688 | ||
689 | if (addr_type == IPV6_ADDR_ANY) { | |
690 | addr6 = &ipv6_hdr(skb)->daddr; | |
691 | addr_type = ipv6_addr_type(addr6); | |
692 | } | |
693 | ||
694 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
695 | goto tx_error_icmp; | |
696 | ||
697 | dst = addr6->s6_addr32[3]; | |
698 | } | |
699 | ||
700 | { | |
701 | struct flowi fl = { .nl_u = { .ip4_u = | |
702 | { .daddr = dst, | |
703 | .saddr = tiph->saddr, | |
704 | .tos = RT_TOS(tos) } }, | |
705 | .oif = tunnel->parms.link, | |
706 | .proto = IPPROTO_IPV6 }; | |
707 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
708 | tunnel->stat.tx_carrier_errors++; | |
709 | goto tx_error_icmp; | |
710 | } | |
711 | } | |
712 | if (rt->rt_type != RTN_UNICAST) { | |
713 | ip_rt_put(rt); | |
714 | tunnel->stat.tx_carrier_errors++; | |
715 | goto tx_error_icmp; | |
716 | } | |
717 | tdev = rt->u.dst.dev; | |
718 | ||
719 | if (tdev == dev) { | |
720 | ip_rt_put(rt); | |
721 | tunnel->stat.collisions++; | |
722 | goto tx_error; | |
723 | } | |
724 | ||
725 | if (tiph->frag_off) | |
726 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
727 | else | |
728 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
729 | ||
730 | if (mtu < 68) { | |
731 | tunnel->stat.collisions++; | |
732 | ip_rt_put(rt); | |
733 | goto tx_error; | |
734 | } | |
735 | if (mtu < IPV6_MIN_MTU) | |
736 | mtu = IPV6_MIN_MTU; | |
737 | if (tunnel->parms.iph.daddr && skb->dst) | |
738 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
739 | ||
740 | if (skb->len > mtu) { | |
741 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
742 | ip_rt_put(rt); | |
743 | goto tx_error; | |
744 | } | |
745 | ||
746 | if (tunnel->err_count > 0) { | |
747 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
748 | tunnel->err_count--; | |
749 | dst_link_failure(skb); | |
750 | } else | |
751 | tunnel->err_count = 0; | |
752 | } | |
753 | ||
754 | /* | |
755 | * Okay, now see if we can stuff it in the buffer as-is. | |
756 | */ | |
757 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
758 | ||
759 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || | |
760 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
761 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); | |
762 | if (!new_skb) { | |
763 | ip_rt_put(rt); | |
764 | stats->tx_dropped++; | |
765 | dev_kfree_skb(skb); | |
766 | tunnel->recursion--; | |
767 | return 0; | |
768 | } | |
769 | if (skb->sk) | |
770 | skb_set_owner_w(new_skb, skb->sk); | |
771 | dev_kfree_skb(skb); | |
772 | skb = new_skb; | |
773 | iph6 = ipv6_hdr(skb); | |
774 | } | |
775 | ||
776 | skb->transport_header = skb->network_header; | |
777 | skb_push(skb, sizeof(struct iphdr)); | |
778 | skb_reset_network_header(skb); | |
779 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
780 | IPCB(skb)->flags = 0; | |
781 | dst_release(skb->dst); | |
782 | skb->dst = &rt->u.dst; | |
783 | ||
784 | /* | |
785 | * Push down and install the IPIP header. | |
786 | */ | |
787 | ||
788 | iph = ip_hdr(skb); | |
789 | iph->version = 4; | |
790 | iph->ihl = sizeof(struct iphdr)>>2; | |
791 | if (mtu > IPV6_MIN_MTU) | |
792 | iph->frag_off = htons(IP_DF); | |
793 | else | |
794 | iph->frag_off = 0; | |
795 | ||
796 | iph->protocol = IPPROTO_IPV6; | |
797 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
798 | iph->daddr = rt->rt_dst; | |
799 | iph->saddr = rt->rt_src; | |
800 | ||
801 | if ((iph->ttl = tiph->ttl) == 0) | |
802 | iph->ttl = iph6->hop_limit; | |
803 | ||
804 | nf_reset(skb); | |
805 | ||
806 | IPTUNNEL_XMIT(); | |
807 | tunnel->recursion--; | |
808 | return 0; | |
809 | ||
810 | tx_error_icmp: | |
811 | dst_link_failure(skb); | |
812 | tx_error: | |
813 | stats->tx_errors++; | |
814 | dev_kfree_skb(skb); | |
815 | tunnel->recursion--; | |
816 | return 0; | |
817 | } | |
818 | ||
819 | static void ipip6_tunnel_bind_dev(struct net_device *dev) | |
820 | { | |
821 | struct net_device *tdev = NULL; | |
822 | struct ip_tunnel *tunnel; | |
823 | struct iphdr *iph; | |
824 | ||
825 | tunnel = netdev_priv(dev); | |
826 | iph = &tunnel->parms.iph; | |
827 | ||
828 | if (iph->daddr) { | |
829 | struct flowi fl = { .nl_u = { .ip4_u = | |
830 | { .daddr = iph->daddr, | |
831 | .saddr = iph->saddr, | |
832 | .tos = RT_TOS(iph->tos) } }, | |
833 | .oif = tunnel->parms.link, | |
834 | .proto = IPPROTO_IPV6 }; | |
835 | struct rtable *rt; | |
836 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { | |
837 | tdev = rt->u.dst.dev; | |
838 | ip_rt_put(rt); | |
839 | } | |
840 | dev->flags |= IFF_POINTOPOINT; | |
841 | } | |
842 | ||
843 | if (!tdev && tunnel->parms.link) | |
844 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); | |
845 | ||
846 | if (tdev) { | |
847 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
848 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
849 | if (dev->mtu < IPV6_MIN_MTU) | |
850 | dev->mtu = IPV6_MIN_MTU; | |
851 | } | |
852 | dev->iflink = tunnel->parms.link; | |
853 | } | |
854 | ||
855 | static int | |
856 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
857 | { | |
858 | int err = 0; | |
859 | struct ip_tunnel_parm p; | |
860 | struct ip_tunnel_prl prl; | |
861 | struct ip_tunnel *t; | |
862 | struct net *net = dev_net(dev); | |
863 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
864 | ||
865 | switch (cmd) { | |
866 | case SIOCGETTUNNEL: | |
867 | t = NULL; | |
868 | if (dev == sitn->fb_tunnel_dev) { | |
869 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
870 | err = -EFAULT; | |
871 | break; | |
872 | } | |
873 | t = ipip6_tunnel_locate(net, &p, 0); | |
874 | } | |
875 | if (t == NULL) | |
876 | t = netdev_priv(dev); | |
877 | memcpy(&p, &t->parms, sizeof(p)); | |
878 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
879 | err = -EFAULT; | |
880 | break; | |
881 | ||
882 | case SIOCADDTUNNEL: | |
883 | case SIOCCHGTUNNEL: | |
884 | err = -EPERM; | |
885 | if (!capable(CAP_NET_ADMIN)) | |
886 | goto done; | |
887 | ||
888 | err = -EFAULT; | |
889 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
890 | goto done; | |
891 | ||
892 | err = -EINVAL; | |
893 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
894 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
895 | goto done; | |
896 | if (p.iph.ttl) | |
897 | p.iph.frag_off |= htons(IP_DF); | |
898 | ||
899 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); | |
900 | ||
901 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
902 | if (t != NULL) { | |
903 | if (t->dev != dev) { | |
904 | err = -EEXIST; | |
905 | break; | |
906 | } | |
907 | } else { | |
908 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
909 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
910 | err = -EINVAL; | |
911 | break; | |
912 | } | |
913 | t = netdev_priv(dev); | |
914 | ipip6_tunnel_unlink(sitn, t); | |
915 | t->parms.iph.saddr = p.iph.saddr; | |
916 | t->parms.iph.daddr = p.iph.daddr; | |
917 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
918 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
919 | ipip6_tunnel_link(sitn, t); | |
920 | netdev_state_change(dev); | |
921 | } | |
922 | } | |
923 | ||
924 | if (t) { | |
925 | err = 0; | |
926 | if (cmd == SIOCCHGTUNNEL) { | |
927 | t->parms.iph.ttl = p.iph.ttl; | |
928 | t->parms.iph.tos = p.iph.tos; | |
929 | if (t->parms.link != p.link) { | |
930 | t->parms.link = p.link; | |
931 | ipip6_tunnel_bind_dev(dev); | |
932 | netdev_state_change(dev); | |
933 | } | |
934 | } | |
935 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
936 | err = -EFAULT; | |
937 | } else | |
938 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
939 | break; | |
940 | ||
941 | case SIOCDELTUNNEL: | |
942 | err = -EPERM; | |
943 | if (!capable(CAP_NET_ADMIN)) | |
944 | goto done; | |
945 | ||
946 | if (dev == sitn->fb_tunnel_dev) { | |
947 | err = -EFAULT; | |
948 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
949 | goto done; | |
950 | err = -ENOENT; | |
951 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) | |
952 | goto done; | |
953 | err = -EPERM; | |
954 | if (t == netdev_priv(sitn->fb_tunnel_dev)) | |
955 | goto done; | |
956 | dev = t->dev; | |
957 | } | |
958 | unregister_netdevice(dev); | |
959 | err = 0; | |
960 | break; | |
961 | ||
962 | case SIOCGETPRL: | |
963 | case SIOCADDPRL: | |
964 | case SIOCDELPRL: | |
965 | case SIOCCHGPRL: | |
966 | err = -EPERM; | |
967 | if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN)) | |
968 | goto done; | |
969 | err = -EINVAL; | |
970 | if (dev == sitn->fb_tunnel_dev) | |
971 | goto done; | |
972 | err = -EFAULT; | |
973 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
974 | goto done; | |
975 | err = -ENOENT; | |
976 | if (!(t = netdev_priv(dev))) | |
977 | goto done; | |
978 | ||
979 | switch (cmd) { | |
980 | case SIOCGETPRL: | |
981 | err = ipip6_tunnel_get_prl(t, &prl); | |
982 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, | |
983 | &prl, sizeof(prl))) | |
984 | err = -EFAULT; | |
985 | break; | |
986 | case SIOCDELPRL: | |
987 | err = ipip6_tunnel_del_prl(t, &prl); | |
988 | break; | |
989 | case SIOCADDPRL: | |
990 | case SIOCCHGPRL: | |
991 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); | |
992 | break; | |
993 | } | |
994 | if (cmd != SIOCGETPRL) | |
995 | netdev_state_change(dev); | |
996 | break; | |
997 | ||
998 | default: | |
999 | err = -EINVAL; | |
1000 | } | |
1001 | ||
1002 | done: | |
1003 | return err; | |
1004 | } | |
1005 | ||
1006 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
1007 | { | |
1008 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); | |
1009 | } | |
1010 | ||
1011 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1012 | { | |
1013 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1014 | return -EINVAL; | |
1015 | dev->mtu = new_mtu; | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1020 | { | |
1021 | dev->uninit = ipip6_tunnel_uninit; | |
1022 | dev->destructor = free_netdev; | |
1023 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
1024 | dev->get_stats = ipip6_tunnel_get_stats; | |
1025 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
1026 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
1027 | ||
1028 | dev->type = ARPHRD_SIT; | |
1029 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
1030 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); | |
1031 | dev->flags = IFF_NOARP; | |
1032 | dev->iflink = 0; | |
1033 | dev->addr_len = 4; | |
1034 | dev->features |= NETIF_F_NETNS_LOCAL; | |
1035 | } | |
1036 | ||
1037 | static int ipip6_tunnel_init(struct net_device *dev) | |
1038 | { | |
1039 | struct ip_tunnel *tunnel; | |
1040 | ||
1041 | tunnel = netdev_priv(dev); | |
1042 | ||
1043 | tunnel->dev = dev; | |
1044 | strcpy(tunnel->parms.name, dev->name); | |
1045 | ||
1046 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1047 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1048 | ||
1049 | ipip6_tunnel_bind_dev(dev); | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static int ipip6_fb_tunnel_init(struct net_device *dev) | |
1055 | { | |
1056 | struct ip_tunnel *tunnel = netdev_priv(dev); | |
1057 | struct iphdr *iph = &tunnel->parms.iph; | |
1058 | struct net *net = dev_net(dev); | |
1059 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1060 | ||
1061 | tunnel->dev = dev; | |
1062 | strcpy(tunnel->parms.name, dev->name); | |
1063 | ||
1064 | iph->version = 4; | |
1065 | iph->protocol = IPPROTO_IPV6; | |
1066 | iph->ihl = 5; | |
1067 | iph->ttl = 64; | |
1068 | ||
1069 | dev_hold(dev); | |
1070 | sitn->tunnels_wc[0] = tunnel; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | static struct xfrm_tunnel sit_handler = { | |
1075 | .handler = ipip6_rcv, | |
1076 | .err_handler = ipip6_err, | |
1077 | .priority = 1, | |
1078 | }; | |
1079 | ||
1080 | static void sit_destroy_tunnels(struct sit_net *sitn) | |
1081 | { | |
1082 | int prio; | |
1083 | ||
1084 | for (prio = 1; prio < 4; prio++) { | |
1085 | int h; | |
1086 | for (h = 0; h < HASH_SIZE; h++) { | |
1087 | struct ip_tunnel *t; | |
1088 | while ((t = sitn->tunnels[prio][h]) != NULL) | |
1089 | unregister_netdevice(t->dev); | |
1090 | } | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | static int sit_init_net(struct net *net) | |
1095 | { | |
1096 | int err; | |
1097 | struct sit_net *sitn; | |
1098 | ||
1099 | err = -ENOMEM; | |
1100 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); | |
1101 | if (sitn == NULL) | |
1102 | goto err_alloc; | |
1103 | ||
1104 | err = net_assign_generic(net, sit_net_id, sitn); | |
1105 | if (err < 0) | |
1106 | goto err_assign; | |
1107 | ||
1108 | sitn->tunnels[0] = sitn->tunnels_wc; | |
1109 | sitn->tunnels[1] = sitn->tunnels_l; | |
1110 | sitn->tunnels[2] = sitn->tunnels_r; | |
1111 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1112 | ||
1113 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", | |
1114 | ipip6_tunnel_setup); | |
1115 | if (!sitn->fb_tunnel_dev) { | |
1116 | err = -ENOMEM; | |
1117 | goto err_alloc_dev; | |
1118 | } | |
1119 | ||
1120 | sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
1121 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1122 | ||
1123 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1124 | goto err_reg_dev; | |
1125 | ||
1126 | return 0; | |
1127 | ||
1128 | err_reg_dev: | |
1129 | free_netdev(sitn->fb_tunnel_dev); | |
1130 | err_alloc_dev: | |
1131 | /* nothing */ | |
1132 | err_assign: | |
1133 | kfree(sitn); | |
1134 | err_alloc: | |
1135 | return err; | |
1136 | } | |
1137 | ||
1138 | static void sit_exit_net(struct net *net) | |
1139 | { | |
1140 | struct sit_net *sitn; | |
1141 | ||
1142 | sitn = net_generic(net, sit_net_id); | |
1143 | rtnl_lock(); | |
1144 | sit_destroy_tunnels(sitn); | |
1145 | unregister_netdevice(sitn->fb_tunnel_dev); | |
1146 | rtnl_unlock(); | |
1147 | kfree(sitn); | |
1148 | } | |
1149 | ||
1150 | static struct pernet_operations sit_net_ops = { | |
1151 | .init = sit_init_net, | |
1152 | .exit = sit_exit_net, | |
1153 | }; | |
1154 | ||
1155 | static void __exit sit_cleanup(void) | |
1156 | { | |
1157 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1158 | ||
1159 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); | |
1160 | } | |
1161 | ||
1162 | static int __init sit_init(void) | |
1163 | { | |
1164 | int err; | |
1165 | ||
1166 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1167 | ||
1168 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { | |
1169 | printk(KERN_INFO "sit init: Can't add protocol\n"); | |
1170 | return -EAGAIN; | |
1171 | } | |
1172 | ||
1173 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); | |
1174 | if (err < 0) | |
1175 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); | |
1176 | ||
1177 | return err; | |
1178 | } | |
1179 | ||
1180 | module_init(sit_init); | |
1181 | module_exit(sit_cleanup); | |
1182 | MODULE_LICENSE("GPL"); | |
1183 | MODULE_ALIAS("sit0"); |