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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
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 | |
fadf6bf0 | 19 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
20 | */ |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
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> | |
46f25dff | 36 | #include <linux/if_ether.h> |
1da177e4 LT |
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> | |
8190d900 PE |
55 | #include <net/net_namespace.h> |
56 | #include <net/netns/generic.h> | |
1da177e4 LT |
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 | |
e69a4adc | 65 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 LT |
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 | ||
8190d900 PE |
71 | static int sit_net_id; |
72 | struct sit_net { | |
73 | }; | |
74 | ||
1da177e4 LT |
75 | static struct net_device *ipip6_fb_tunnel_dev; |
76 | ||
77 | static struct ip_tunnel *tunnels_r_l[HASH_SIZE]; | |
78 | static struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
79 | static struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
80 | static struct ip_tunnel *tunnels_wc[1]; | |
81 | static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l }; | |
82 | ||
83 | static DEFINE_RWLOCK(ipip6_lock); | |
84 | ||
e69a4adc | 85 | static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local) |
1da177e4 LT |
86 | { |
87 | unsigned h0 = HASH(remote); | |
88 | unsigned h1 = HASH(local); | |
89 | struct ip_tunnel *t; | |
90 | ||
91 | for (t = tunnels_r_l[h0^h1]; t; t = t->next) { | |
92 | if (local == t->parms.iph.saddr && | |
93 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
94 | return t; | |
95 | } | |
96 | for (t = tunnels_r[h0]; t; t = t->next) { | |
97 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
98 | return t; | |
99 | } | |
100 | for (t = tunnels_l[h1]; t; t = t->next) { | |
101 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
102 | return t; | |
103 | } | |
104 | if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) | |
105 | return t; | |
106 | return NULL; | |
107 | } | |
108 | ||
420fe234 | 109 | static struct ip_tunnel **__ipip6_bucket(struct ip_tunnel_parm *parms) |
1da177e4 | 110 | { |
420fe234 YH |
111 | __be32 remote = parms->iph.daddr; |
112 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
113 | unsigned h = 0; |
114 | int prio = 0; | |
115 | ||
116 | if (remote) { | |
117 | prio |= 2; | |
118 | h ^= HASH(remote); | |
119 | } | |
120 | if (local) { | |
121 | prio |= 1; | |
122 | h ^= HASH(local); | |
123 | } | |
124 | return &tunnels[prio][h]; | |
125 | } | |
126 | ||
420fe234 YH |
127 | static inline struct ip_tunnel **ipip6_bucket(struct ip_tunnel *t) |
128 | { | |
129 | return __ipip6_bucket(&t->parms); | |
130 | } | |
131 | ||
1da177e4 LT |
132 | static void ipip6_tunnel_unlink(struct ip_tunnel *t) |
133 | { | |
134 | struct ip_tunnel **tp; | |
135 | ||
136 | for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) { | |
137 | if (t == *tp) { | |
138 | write_lock_bh(&ipip6_lock); | |
139 | *tp = t->next; | |
140 | write_unlock_bh(&ipip6_lock); | |
141 | break; | |
142 | } | |
143 | } | |
144 | } | |
145 | ||
146 | static void ipip6_tunnel_link(struct ip_tunnel *t) | |
147 | { | |
148 | struct ip_tunnel **tp = ipip6_bucket(t); | |
149 | ||
150 | t->next = *tp; | |
151 | write_lock_bh(&ipip6_lock); | |
152 | *tp = t; | |
153 | write_unlock_bh(&ipip6_lock); | |
154 | } | |
155 | ||
156 | static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create) | |
157 | { | |
e69a4adc AV |
158 | __be32 remote = parms->iph.daddr; |
159 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
160 | struct ip_tunnel *t, **tp, *nt; |
161 | struct net_device *dev; | |
1da177e4 LT |
162 | char name[IFNAMSIZ]; |
163 | ||
420fe234 | 164 | for (tp = __ipip6_bucket(parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
165 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
166 | return t; | |
167 | } | |
168 | if (!create) | |
169 | goto failed; | |
170 | ||
171 | if (parms->name[0]) | |
172 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
173 | else |
174 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
175 | |
176 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
177 | if (dev == NULL) | |
178 | return NULL; | |
179 | ||
b37d428b PE |
180 | if (strchr(name, '%')) { |
181 | if (dev_alloc_name(dev, name) < 0) | |
182 | goto failed_free; | |
183 | } | |
184 | ||
2941a486 | 185 | nt = netdev_priv(dev); |
1da177e4 LT |
186 | dev->init = ipip6_tunnel_init; |
187 | nt->parms = *parms; | |
188 | ||
c7dc89c0 FT |
189 | if (parms->i_flags & SIT_ISATAP) |
190 | dev->priv_flags |= IFF_ISATAP; | |
191 | ||
b37d428b PE |
192 | if (register_netdevice(dev) < 0) |
193 | goto failed_free; | |
1da177e4 LT |
194 | |
195 | dev_hold(dev); | |
196 | ||
197 | ipip6_tunnel_link(nt); | |
1da177e4 LT |
198 | return nt; |
199 | ||
b37d428b PE |
200 | failed_free: |
201 | free_netdev(dev); | |
1da177e4 LT |
202 | failed: |
203 | return NULL; | |
204 | } | |
205 | ||
fadf6bf0 | 206 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 207 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
208 | { |
209 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
210 | ||
211 | for (p = t->prl; p; p = p->next) | |
300aaeea | 212 | if (p->addr == addr) |
fadf6bf0 TF |
213 | break; |
214 | return p; | |
215 | ||
216 | } | |
217 | ||
300aaeea YH |
218 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) |
219 | { | |
220 | struct ip_tunnel_prl *kp; | |
221 | struct ip_tunnel_prl_entry *prl; | |
222 | unsigned int cmax, c = 0, ca, len; | |
223 | int ret = 0; | |
224 | ||
225 | cmax = a->datalen / sizeof(*a); | |
226 | if (cmax > 1 && a->addr != htonl(INADDR_ANY)) | |
227 | cmax = 1; | |
228 | ||
229 | /* For simple GET or for root users, | |
230 | * we try harder to allocate. | |
231 | */ | |
232 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
233 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
234 | NULL; | |
235 | ||
236 | read_lock(&ipip6_lock); | |
237 | ||
238 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
239 | ||
240 | if (!kp) { | |
241 | /* We don't try hard to allocate much memory for | |
242 | * non-root users. | |
243 | * For root users, retry allocating enough memory for | |
244 | * the answer. | |
245 | */ | |
246 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
247 | if (!kp) { | |
248 | ret = -ENOMEM; | |
249 | goto out; | |
250 | } | |
251 | } | |
252 | ||
253 | c = 0; | |
254 | for (prl = t->prl; prl; prl = prl->next) { | |
255 | if (c > cmax) | |
256 | break; | |
257 | if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr) | |
258 | continue; | |
259 | kp[c].addr = prl->addr; | |
260 | kp[c].flags = prl->flags; | |
261 | c++; | |
262 | if (a->addr != htonl(INADDR_ANY)) | |
263 | break; | |
264 | } | |
265 | out: | |
266 | read_unlock(&ipip6_lock); | |
267 | ||
268 | len = sizeof(*kp) * c; | |
269 | ret = len ? copy_to_user(a->data, kp, len) : 0; | |
270 | ||
271 | kfree(kp); | |
272 | if (ret) | |
273 | return -EFAULT; | |
274 | ||
275 | a->datalen = len; | |
276 | return 0; | |
277 | } | |
278 | ||
fadf6bf0 TF |
279 | static int |
280 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
281 | { | |
282 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
283 | int err = 0; |
284 | ||
0009ae1f YH |
285 | if (a->addr == htonl(INADDR_ANY)) |
286 | return -EINVAL; | |
287 | ||
3fcfa129 | 288 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
289 | |
290 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 291 | if (p->addr == a->addr) { |
3fcfa129 YH |
292 | if (chg) |
293 | goto update; | |
294 | err = -EEXIST; | |
295 | goto out; | |
fadf6bf0 TF |
296 | } |
297 | } | |
298 | ||
3fcfa129 YH |
299 | if (chg) { |
300 | err = -ENXIO; | |
301 | goto out; | |
302 | } | |
fadf6bf0 TF |
303 | |
304 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
305 | if (!p) { |
306 | err = -ENOBUFS; | |
307 | goto out; | |
308 | } | |
fadf6bf0 | 309 | |
fadf6bf0 TF |
310 | p->next = t->prl; |
311 | t->prl = p; | |
300aaeea | 312 | t->prl_count++; |
3fcfa129 | 313 | update: |
300aaeea YH |
314 | p->addr = a->addr; |
315 | p->flags = a->flags; | |
3fcfa129 YH |
316 | out: |
317 | write_unlock(&ipip6_lock); | |
318 | return err; | |
fadf6bf0 TF |
319 | } |
320 | ||
321 | static int | |
322 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
323 | { | |
324 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
325 | int err = 0; |
326 | ||
327 | write_lock(&ipip6_lock); | |
fadf6bf0 | 328 | |
0009ae1f | 329 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 330 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 331 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
332 | x = *p; |
333 | *p = x->next; | |
334 | kfree(x); | |
300aaeea | 335 | t->prl_count--; |
3fcfa129 | 336 | goto out; |
fadf6bf0 TF |
337 | } |
338 | } | |
3fcfa129 | 339 | err = -ENXIO; |
fadf6bf0 TF |
340 | } else { |
341 | while (t->prl) { | |
342 | x = t->prl; | |
343 | t->prl = t->prl->next; | |
344 | kfree(x); | |
300aaeea | 345 | t->prl_count--; |
fadf6bf0 TF |
346 | } |
347 | } | |
3fcfa129 YH |
348 | out: |
349 | write_unlock(&ipip6_lock); | |
fadf6bf0 TF |
350 | return 0; |
351 | } | |
352 | ||
fadf6bf0 TF |
353 | static int |
354 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
355 | { | |
3fcfa129 | 356 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
357 | int ok = 1; |
358 | ||
3fcfa129 YH |
359 | read_lock(&ipip6_lock); |
360 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 361 | if (p) { |
300aaeea | 362 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
363 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
364 | else | |
365 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
366 | } else { | |
367 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
368 | if (ipv6_addr_is_isatap(addr6) && | |
369 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 370 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
371 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
372 | else | |
373 | ok = 0; | |
374 | } | |
3fcfa129 | 375 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
376 | return ok; |
377 | } | |
378 | ||
1da177e4 LT |
379 | static void ipip6_tunnel_uninit(struct net_device *dev) |
380 | { | |
381 | if (dev == ipip6_fb_tunnel_dev) { | |
382 | write_lock_bh(&ipip6_lock); | |
383 | tunnels_wc[0] = NULL; | |
384 | write_unlock_bh(&ipip6_lock); | |
385 | dev_put(dev); | |
386 | } else { | |
2941a486 | 387 | ipip6_tunnel_unlink(netdev_priv(dev)); |
02e10b90 | 388 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
389 | dev_put(dev); |
390 | } | |
391 | } | |
392 | ||
393 | ||
c73cb5a2 | 394 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 LT |
395 | { |
396 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
397 | ||
398 | /* It is not :-( All the routers (except for Linux) return only | |
399 | 8 bytes of packet payload. It means, that precise relaying of | |
400 | ICMP in the real Internet is absolutely infeasible. | |
401 | */ | |
402 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
403 | const int type = icmp_hdr(skb)->type; |
404 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 405 | struct ip_tunnel *t; |
c73cb5a2 | 406 | int err; |
1da177e4 LT |
407 | |
408 | switch (type) { | |
409 | default: | |
410 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 411 | return 0; |
1da177e4 LT |
412 | |
413 | case ICMP_DEST_UNREACH: | |
414 | switch (code) { | |
415 | case ICMP_SR_FAILED: | |
416 | case ICMP_PORT_UNREACH: | |
417 | /* Impossible event. */ | |
c73cb5a2 | 418 | return 0; |
1da177e4 LT |
419 | case ICMP_FRAG_NEEDED: |
420 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 421 | return 0; |
1da177e4 LT |
422 | default: |
423 | /* All others are translated to HOST_UNREACH. | |
424 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
425 | I believe they are just ether pollution. --ANK | |
426 | */ | |
427 | break; | |
428 | } | |
429 | break; | |
430 | case ICMP_TIME_EXCEEDED: | |
431 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 432 | return 0; |
1da177e4 LT |
433 | break; |
434 | } | |
435 | ||
c73cb5a2 KM |
436 | err = -ENOENT; |
437 | ||
1da177e4 LT |
438 | read_lock(&ipip6_lock); |
439 | t = ipip6_tunnel_lookup(iph->daddr, iph->saddr); | |
440 | if (t == NULL || t->parms.iph.daddr == 0) | |
441 | goto out; | |
c73cb5a2 KM |
442 | |
443 | err = 0; | |
1da177e4 LT |
444 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
445 | goto out; | |
446 | ||
447 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
448 | t->err_count++; | |
449 | else | |
450 | t->err_count = 1; | |
451 | t->err_time = jiffies; | |
452 | out: | |
453 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 454 | return err; |
1da177e4 LT |
455 | #else |
456 | struct iphdr *iph = (struct iphdr*)dp; | |
457 | int hlen = iph->ihl<<2; | |
458 | struct ipv6hdr *iph6; | |
88c7664f ACM |
459 | const int type = icmp_hdr(skb)->type; |
460 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
461 | int rel_type = 0; |
462 | int rel_code = 0; | |
463 | int rel_info = 0; | |
464 | struct sk_buff *skb2; | |
465 | struct rt6_info *rt6i; | |
466 | ||
467 | if (len < hlen + sizeof(struct ipv6hdr)) | |
468 | return; | |
469 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
470 | ||
471 | switch (type) { | |
472 | default: | |
473 | return; | |
474 | case ICMP_PARAMETERPROB: | |
88c7664f | 475 | if (icmp_hdr(skb)->un.gateway < hlen) |
1da177e4 LT |
476 | return; |
477 | ||
478 | /* So... This guy found something strange INSIDE encapsulated | |
479 | packet. Well, he is fool, but what can we do ? | |
480 | */ | |
481 | rel_type = ICMPV6_PARAMPROB; | |
88c7664f | 482 | rel_info = icmp_hdr(skb)->un.gateway - hlen; |
1da177e4 LT |
483 | break; |
484 | ||
485 | case ICMP_DEST_UNREACH: | |
486 | switch (code) { | |
487 | case ICMP_SR_FAILED: | |
488 | case ICMP_PORT_UNREACH: | |
489 | /* Impossible event. */ | |
490 | return; | |
491 | case ICMP_FRAG_NEEDED: | |
492 | /* Too complicated case ... */ | |
493 | return; | |
494 | default: | |
495 | /* All others are translated to HOST_UNREACH. | |
496 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
497 | I believe, it is just ether pollution. --ANK | |
498 | */ | |
499 | rel_type = ICMPV6_DEST_UNREACH; | |
500 | rel_code = ICMPV6_ADDR_UNREACH; | |
501 | break; | |
502 | } | |
503 | break; | |
504 | case ICMP_TIME_EXCEEDED: | |
505 | if (code != ICMP_EXC_TTL) | |
506 | return; | |
507 | rel_type = ICMPV6_TIME_EXCEED; | |
508 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
509 | break; | |
510 | } | |
511 | ||
512 | /* Prepare fake skb to feed it to icmpv6_send */ | |
513 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
514 | if (skb2 == NULL) | |
c73cb5a2 | 515 | return 0; |
1da177e4 LT |
516 | dst_release(skb2->dst); |
517 | skb2->dst = NULL; | |
518 | skb_pull(skb2, skb->data - (u8*)iph6); | |
c1d2bbe1 | 519 | skb_reset_network_header(skb2); |
1da177e4 LT |
520 | |
521 | /* Try to guess incoming interface */ | |
606a2b48 | 522 | rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0); |
1da177e4 LT |
523 | if (rt6i && rt6i->rt6i_dev) { |
524 | skb2->dev = rt6i->rt6i_dev; | |
525 | ||
606a2b48 | 526 | rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0); |
1da177e4 LT |
527 | |
528 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
2941a486 | 529 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); |
1da177e4 LT |
530 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { |
531 | rel_type = ICMPV6_DEST_UNREACH; | |
532 | rel_code = ICMPV6_ADDR_UNREACH; | |
533 | } | |
534 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
535 | } | |
536 | } | |
537 | kfree_skb(skb2); | |
c73cb5a2 | 538 | return 0; |
1da177e4 LT |
539 | #endif |
540 | } | |
541 | ||
542 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
543 | { | |
544 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 545 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
546 | } |
547 | ||
548 | static int ipip6_rcv(struct sk_buff *skb) | |
549 | { | |
550 | struct iphdr *iph; | |
551 | struct ip_tunnel *tunnel; | |
552 | ||
553 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
554 | goto out; | |
555 | ||
eddc9ec5 | 556 | iph = ip_hdr(skb); |
1da177e4 LT |
557 | |
558 | read_lock(&ipip6_lock); | |
559 | if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) { | |
560 | secpath_reset(skb); | |
b0e380b1 | 561 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 562 | skb_reset_network_header(skb); |
8cdfab8a | 563 | IPCB(skb)->flags = 0; |
1da177e4 LT |
564 | skb->protocol = htons(ETH_P_IPV6); |
565 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
566 | |
567 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 568 | !isatap_chksrc(skb, iph, tunnel)) { |
c7dc89c0 FT |
569 | tunnel->stat.rx_errors++; |
570 | read_unlock(&ipip6_lock); | |
571 | kfree_skb(skb); | |
572 | return 0; | |
573 | } | |
1da177e4 LT |
574 | tunnel->stat.rx_packets++; |
575 | tunnel->stat.rx_bytes += skb->len; | |
576 | skb->dev = tunnel->dev; | |
577 | dst_release(skb->dst); | |
578 | skb->dst = NULL; | |
579 | nf_reset(skb); | |
580 | ipip6_ecn_decapsulate(iph, skb); | |
581 | netif_rx(skb); | |
582 | read_unlock(&ipip6_lock); | |
583 | return 0; | |
584 | } | |
585 | ||
45af08be | 586 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
587 | kfree_skb(skb); |
588 | read_unlock(&ipip6_lock); | |
589 | out: | |
590 | return 0; | |
591 | } | |
592 | ||
593 | /* Returns the embedded IPv4 address if the IPv6 address | |
594 | comes from 6to4 (RFC 3056) addr space */ | |
595 | ||
e69a4adc | 596 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 597 | { |
e69a4adc | 598 | __be32 dst = 0; |
1da177e4 LT |
599 | |
600 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 601 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
602 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
603 | } | |
604 | return dst; | |
605 | } | |
606 | ||
607 | /* | |
608 | * This function assumes it is being called from dev_queue_xmit() | |
609 | * and that skb is filled properly by that function. | |
610 | */ | |
611 | ||
612 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
613 | { | |
2941a486 | 614 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
615 | struct net_device_stats *stats = &tunnel->stat; |
616 | struct iphdr *tiph = &tunnel->parms.iph; | |
0660e03f | 617 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
618 | u8 tos = tunnel->parms.iph.tos; |
619 | struct rtable *rt; /* Route to the other host */ | |
620 | struct net_device *tdev; /* Device to other host */ | |
621 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 622 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 623 | __be32 dst = tiph->daddr; |
1da177e4 | 624 | int mtu; |
1ab1457c | 625 | struct in6_addr *addr6; |
1da177e4 LT |
626 | int addr_type; |
627 | ||
628 | if (tunnel->recursion++) { | |
629 | tunnel->stat.collisions++; | |
630 | goto tx_error; | |
631 | } | |
632 | ||
633 | if (skb->protocol != htons(ETH_P_IPV6)) | |
634 | goto tx_error; | |
635 | ||
c7dc89c0 FT |
636 | /* ISATAP (RFC4214) - must come before 6to4 */ |
637 | if (dev->priv_flags & IFF_ISATAP) { | |
638 | struct neighbour *neigh = NULL; | |
639 | ||
640 | if (skb->dst) | |
641 | neigh = skb->dst->neighbour; | |
642 | ||
643 | if (neigh == NULL) { | |
644 | if (net_ratelimit()) | |
645 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
646 | goto tx_error; | |
647 | } | |
648 | ||
649 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
650 | addr_type = ipv6_addr_type(addr6); | |
651 | ||
652 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
653 | ipv6_addr_is_isatap(addr6)) | |
654 | dst = addr6->s6_addr32[3]; | |
655 | else | |
656 | goto tx_error; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | if (!dst) |
660 | dst = try_6to4(&iph6->daddr); | |
661 | ||
662 | if (!dst) { | |
663 | struct neighbour *neigh = NULL; | |
664 | ||
665 | if (skb->dst) | |
666 | neigh = skb->dst->neighbour; | |
667 | ||
668 | if (neigh == NULL) { | |
669 | if (net_ratelimit()) | |
670 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
671 | goto tx_error; | |
672 | } | |
673 | ||
674 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
675 | addr_type = ipv6_addr_type(addr6); | |
676 | ||
677 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 678 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
679 | addr_type = ipv6_addr_type(addr6); |
680 | } | |
681 | ||
682 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
683 | goto tx_error_icmp; | |
684 | ||
685 | dst = addr6->s6_addr32[3]; | |
686 | } | |
687 | ||
688 | { | |
689 | struct flowi fl = { .nl_u = { .ip4_u = | |
690 | { .daddr = dst, | |
691 | .saddr = tiph->saddr, | |
692 | .tos = RT_TOS(tos) } }, | |
693 | .oif = tunnel->parms.link, | |
694 | .proto = IPPROTO_IPV6 }; | |
f206351a | 695 | if (ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
696 | tunnel->stat.tx_carrier_errors++; |
697 | goto tx_error_icmp; | |
698 | } | |
699 | } | |
700 | if (rt->rt_type != RTN_UNICAST) { | |
701 | ip_rt_put(rt); | |
702 | tunnel->stat.tx_carrier_errors++; | |
703 | goto tx_error_icmp; | |
704 | } | |
705 | tdev = rt->u.dst.dev; | |
706 | ||
707 | if (tdev == dev) { | |
708 | ip_rt_put(rt); | |
709 | tunnel->stat.collisions++; | |
710 | goto tx_error; | |
711 | } | |
712 | ||
713 | if (tiph->frag_off) | |
714 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
715 | else | |
716 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
717 | ||
718 | if (mtu < 68) { | |
719 | tunnel->stat.collisions++; | |
720 | ip_rt_put(rt); | |
721 | goto tx_error; | |
722 | } | |
723 | if (mtu < IPV6_MIN_MTU) | |
724 | mtu = IPV6_MIN_MTU; | |
725 | if (tunnel->parms.iph.daddr && skb->dst) | |
726 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
727 | ||
728 | if (skb->len > mtu) { | |
729 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
730 | ip_rt_put(rt); | |
731 | goto tx_error; | |
732 | } | |
733 | ||
734 | if (tunnel->err_count > 0) { | |
735 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
736 | tunnel->err_count--; | |
737 | dst_link_failure(skb); | |
738 | } else | |
739 | tunnel->err_count = 0; | |
740 | } | |
741 | ||
742 | /* | |
743 | * Okay, now see if we can stuff it in the buffer as-is. | |
744 | */ | |
745 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
746 | ||
cfbba49d PM |
747 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
748 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
749 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
750 | if (!new_skb) { | |
751 | ip_rt_put(rt); | |
1ab1457c | 752 | stats->tx_dropped++; |
1da177e4 LT |
753 | dev_kfree_skb(skb); |
754 | tunnel->recursion--; | |
755 | return 0; | |
756 | } | |
757 | if (skb->sk) | |
758 | skb_set_owner_w(new_skb, skb->sk); | |
759 | dev_kfree_skb(skb); | |
760 | skb = new_skb; | |
0660e03f | 761 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
762 | } |
763 | ||
b0e380b1 | 764 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
765 | skb_push(skb, sizeof(struct iphdr)); |
766 | skb_reset_network_header(skb); | |
1da177e4 | 767 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 768 | IPCB(skb)->flags = 0; |
1da177e4 LT |
769 | dst_release(skb->dst); |
770 | skb->dst = &rt->u.dst; | |
771 | ||
772 | /* | |
773 | * Push down and install the IPIP header. | |
774 | */ | |
775 | ||
eddc9ec5 | 776 | iph = ip_hdr(skb); |
1da177e4 LT |
777 | iph->version = 4; |
778 | iph->ihl = sizeof(struct iphdr)>>2; | |
779 | if (mtu > IPV6_MIN_MTU) | |
780 | iph->frag_off = htons(IP_DF); | |
781 | else | |
782 | iph->frag_off = 0; | |
783 | ||
784 | iph->protocol = IPPROTO_IPV6; | |
785 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
786 | iph->daddr = rt->rt_dst; | |
787 | iph->saddr = rt->rt_src; | |
788 | ||
789 | if ((iph->ttl = tiph->ttl) == 0) | |
790 | iph->ttl = iph6->hop_limit; | |
791 | ||
792 | nf_reset(skb); | |
793 | ||
794 | IPTUNNEL_XMIT(); | |
795 | tunnel->recursion--; | |
796 | return 0; | |
797 | ||
798 | tx_error_icmp: | |
799 | dst_link_failure(skb); | |
800 | tx_error: | |
801 | stats->tx_errors++; | |
802 | dev_kfree_skb(skb); | |
803 | tunnel->recursion--; | |
804 | return 0; | |
805 | } | |
806 | ||
8a4a50f9 MS |
807 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
808 | { | |
809 | struct net_device *tdev = NULL; | |
810 | struct ip_tunnel *tunnel; | |
811 | struct iphdr *iph; | |
812 | ||
813 | tunnel = netdev_priv(dev); | |
814 | iph = &tunnel->parms.iph; | |
815 | ||
816 | if (iph->daddr) { | |
817 | struct flowi fl = { .nl_u = { .ip4_u = | |
818 | { .daddr = iph->daddr, | |
819 | .saddr = iph->saddr, | |
820 | .tos = RT_TOS(iph->tos) } }, | |
821 | .oif = tunnel->parms.link, | |
822 | .proto = IPPROTO_IPV6 }; | |
823 | struct rtable *rt; | |
f206351a | 824 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
8a4a50f9 MS |
825 | tdev = rt->u.dst.dev; |
826 | ip_rt_put(rt); | |
827 | } | |
828 | dev->flags |= IFF_POINTOPOINT; | |
829 | } | |
830 | ||
831 | if (!tdev && tunnel->parms.link) | |
832 | tdev = __dev_get_by_index(&init_net, tunnel->parms.link); | |
833 | ||
834 | if (tdev) { | |
835 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
836 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
837 | if (dev->mtu < IPV6_MIN_MTU) | |
838 | dev->mtu = IPV6_MIN_MTU; | |
839 | } | |
840 | dev->iflink = tunnel->parms.link; | |
841 | } | |
842 | ||
1da177e4 LT |
843 | static int |
844 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
845 | { | |
846 | int err = 0; | |
847 | struct ip_tunnel_parm p; | |
fadf6bf0 | 848 | struct ip_tunnel_prl prl; |
1da177e4 LT |
849 | struct ip_tunnel *t; |
850 | ||
851 | switch (cmd) { | |
852 | case SIOCGETTUNNEL: | |
853 | t = NULL; | |
854 | if (dev == ipip6_fb_tunnel_dev) { | |
855 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { | |
856 | err = -EFAULT; | |
857 | break; | |
858 | } | |
859 | t = ipip6_tunnel_locate(&p, 0); | |
860 | } | |
861 | if (t == NULL) | |
2941a486 | 862 | t = netdev_priv(dev); |
1da177e4 LT |
863 | memcpy(&p, &t->parms, sizeof(p)); |
864 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
865 | err = -EFAULT; | |
866 | break; | |
867 | ||
868 | case SIOCADDTUNNEL: | |
869 | case SIOCCHGTUNNEL: | |
870 | err = -EPERM; | |
871 | if (!capable(CAP_NET_ADMIN)) | |
872 | goto done; | |
873 | ||
874 | err = -EFAULT; | |
875 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
876 | goto done; | |
877 | ||
878 | err = -EINVAL; | |
879 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
880 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
881 | goto done; | |
882 | if (p.iph.ttl) | |
883 | p.iph.frag_off |= htons(IP_DF); | |
884 | ||
885 | t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL); | |
886 | ||
887 | if (dev != ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { | |
888 | if (t != NULL) { | |
889 | if (t->dev != dev) { | |
890 | err = -EEXIST; | |
891 | break; | |
892 | } | |
893 | } else { | |
894 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
895 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
896 | err = -EINVAL; | |
897 | break; | |
898 | } | |
2941a486 | 899 | t = netdev_priv(dev); |
1da177e4 LT |
900 | ipip6_tunnel_unlink(t); |
901 | t->parms.iph.saddr = p.iph.saddr; | |
902 | t->parms.iph.daddr = p.iph.daddr; | |
903 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
904 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
905 | ipip6_tunnel_link(t); | |
906 | netdev_state_change(dev); | |
907 | } | |
908 | } | |
909 | ||
910 | if (t) { | |
911 | err = 0; | |
912 | if (cmd == SIOCCHGTUNNEL) { | |
913 | t->parms.iph.ttl = p.iph.ttl; | |
914 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
915 | if (t->parms.link != p.link) { |
916 | t->parms.link = p.link; | |
917 | ipip6_tunnel_bind_dev(dev); | |
918 | netdev_state_change(dev); | |
919 | } | |
1da177e4 LT |
920 | } |
921 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
922 | err = -EFAULT; | |
923 | } else | |
924 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
925 | break; | |
926 | ||
927 | case SIOCDELTUNNEL: | |
928 | err = -EPERM; | |
929 | if (!capable(CAP_NET_ADMIN)) | |
930 | goto done; | |
931 | ||
932 | if (dev == ipip6_fb_tunnel_dev) { | |
933 | err = -EFAULT; | |
934 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
935 | goto done; | |
936 | err = -ENOENT; | |
937 | if ((t = ipip6_tunnel_locate(&p, 0)) == NULL) | |
938 | goto done; | |
939 | err = -EPERM; | |
2941a486 | 940 | if (t == netdev_priv(ipip6_fb_tunnel_dev)) |
1da177e4 LT |
941 | goto done; |
942 | dev = t->dev; | |
943 | } | |
22f8cde5 SH |
944 | unregister_netdevice(dev); |
945 | err = 0; | |
1da177e4 LT |
946 | break; |
947 | ||
300aaeea | 948 | case SIOCGETPRL: |
fadf6bf0 TF |
949 | case SIOCADDPRL: |
950 | case SIOCDELPRL: | |
951 | case SIOCCHGPRL: | |
952 | err = -EPERM; | |
300aaeea | 953 | if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
954 | goto done; |
955 | err = -EINVAL; | |
956 | if (dev == ipip6_fb_tunnel_dev) | |
957 | goto done; | |
958 | err = -EFAULT; | |
959 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
960 | goto done; | |
961 | err = -ENOENT; | |
962 | if (!(t = netdev_priv(dev))) | |
963 | goto done; | |
964 | ||
300aaeea YH |
965 | switch (cmd) { |
966 | case SIOCGETPRL: | |
967 | err = ipip6_tunnel_get_prl(t, &prl); | |
968 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, | |
969 | &prl, sizeof(prl))) | |
970 | err = -EFAULT; | |
971 | break; | |
972 | case SIOCDELPRL: | |
fadf6bf0 | 973 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
974 | break; |
975 | case SIOCADDPRL: | |
976 | case SIOCCHGPRL: | |
fadf6bf0 | 977 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
978 | break; |
979 | } | |
980 | if (cmd != SIOCGETPRL) | |
981 | netdev_state_change(dev); | |
fadf6bf0 TF |
982 | break; |
983 | ||
1da177e4 LT |
984 | default: |
985 | err = -EINVAL; | |
986 | } | |
987 | ||
988 | done: | |
989 | return err; | |
990 | } | |
991 | ||
992 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
993 | { | |
2941a486 | 994 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
995 | } |
996 | ||
997 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
998 | { | |
999 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1000 | return -EINVAL; | |
1001 | dev->mtu = new_mtu; | |
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1006 | { | |
1da177e4 LT |
1007 | dev->uninit = ipip6_tunnel_uninit; |
1008 | dev->destructor = free_netdev; | |
1009 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
1010 | dev->get_stats = ipip6_tunnel_get_stats; | |
1011 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
1012 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
1013 | ||
1014 | dev->type = ARPHRD_SIT; | |
1015 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1016 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
1017 | dev->flags = IFF_NOARP; |
1018 | dev->iflink = 0; | |
1019 | dev->addr_len = 4; | |
1020 | } | |
1021 | ||
1022 | static int ipip6_tunnel_init(struct net_device *dev) | |
1023 | { | |
1da177e4 | 1024 | struct ip_tunnel *tunnel; |
1da177e4 | 1025 | |
2941a486 | 1026 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1027 | |
1028 | tunnel->dev = dev; | |
1029 | strcpy(tunnel->parms.name, dev->name); | |
1030 | ||
1031 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1032 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1033 | ||
8a4a50f9 | 1034 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1035 | |
1036 | return 0; | |
1037 | } | |
1038 | ||
20380731 | 1039 | static int __init ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1040 | { |
2941a486 | 1041 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1042 | struct iphdr *iph = &tunnel->parms.iph; |
1043 | ||
1044 | tunnel->dev = dev; | |
1045 | strcpy(tunnel->parms.name, dev->name); | |
1046 | ||
1047 | iph->version = 4; | |
1048 | iph->protocol = IPPROTO_IPV6; | |
1049 | iph->ihl = 5; | |
1050 | iph->ttl = 64; | |
1051 | ||
1052 | dev_hold(dev); | |
1053 | tunnels_wc[0] = tunnel; | |
1054 | return 0; | |
1055 | } | |
1056 | ||
c73cb5a2 | 1057 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1058 | .handler = ipip6_rcv, |
1059 | .err_handler = ipip6_err, | |
c73cb5a2 | 1060 | .priority = 1, |
1da177e4 LT |
1061 | }; |
1062 | ||
db44575f AK |
1063 | static void __exit sit_destroy_tunnels(void) |
1064 | { | |
1065 | int prio; | |
1066 | ||
1067 | for (prio = 1; prio < 4; prio++) { | |
1068 | int h; | |
1069 | for (h = 0; h < HASH_SIZE; h++) { | |
1070 | struct ip_tunnel *t; | |
1071 | while ((t = tunnels[prio][h]) != NULL) | |
1072 | unregister_netdevice(t->dev); | |
1073 | } | |
1074 | } | |
1075 | } | |
1076 | ||
8190d900 PE |
1077 | static int sit_init_net(struct net *net) |
1078 | { | |
1079 | int err; | |
1080 | struct sit_net *sitn; | |
1081 | ||
1082 | err = -ENOMEM; | |
1083 | sitn = kmalloc(sizeof(struct sit_net), GFP_KERNEL); | |
1084 | if (sitn == NULL) | |
1085 | goto err_alloc; | |
1086 | ||
1087 | err = net_assign_generic(net, sit_net_id, sitn); | |
1088 | if (err < 0) | |
1089 | goto err_assign; | |
1090 | ||
1091 | return 0; | |
1092 | ||
1093 | err_assign: | |
1094 | kfree(sitn); | |
1095 | err_alloc: | |
1096 | return err; | |
1097 | } | |
1098 | ||
1099 | static void sit_exit_net(struct net *net) | |
1100 | { | |
1101 | struct sit_net *sitn; | |
1102 | ||
1103 | sitn = net_generic(net, sit_net_id); | |
1104 | kfree(sitn); | |
1105 | } | |
1106 | ||
1107 | static struct pernet_operations sit_net_ops = { | |
1108 | .init = sit_init_net, | |
1109 | .exit = sit_exit_net, | |
1110 | }; | |
1111 | ||
89c89458 | 1112 | static void __exit sit_cleanup(void) |
1da177e4 | 1113 | { |
c73cb5a2 | 1114 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f AK |
1115 | |
1116 | rtnl_lock(); | |
1117 | sit_destroy_tunnels(); | |
1118 | unregister_netdevice(ipip6_fb_tunnel_dev); | |
1119 | rtnl_unlock(); | |
8190d900 PE |
1120 | |
1121 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); | |
1da177e4 LT |
1122 | } |
1123 | ||
89c89458 | 1124 | static int __init sit_init(void) |
1da177e4 LT |
1125 | { |
1126 | int err; | |
1127 | ||
1128 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1129 | ||
c73cb5a2 | 1130 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1131 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1132 | return -EAGAIN; | |
1133 | } | |
1134 | ||
1ab1457c | 1135 | ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1da177e4 LT |
1136 | ipip6_tunnel_setup); |
1137 | if (!ipip6_fb_tunnel_dev) { | |
1138 | err = -ENOMEM; | |
1139 | goto err1; | |
1140 | } | |
1141 | ||
1142 | ipip6_fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
1143 | ||
1144 | if ((err = register_netdev(ipip6_fb_tunnel_dev))) | |
1145 | goto err2; | |
1146 | ||
8190d900 PE |
1147 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1148 | if (err < 0) | |
1149 | goto err3; | |
1150 | ||
1da177e4 LT |
1151 | out: |
1152 | return err; | |
1153 | err2: | |
1154 | free_netdev(ipip6_fb_tunnel_dev); | |
1155 | err1: | |
c73cb5a2 | 1156 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
1da177e4 | 1157 | goto out; |
8190d900 PE |
1158 | err3: |
1159 | unregister_netdevice(ipip6_fb_tunnel_dev); | |
1160 | goto err1; | |
1da177e4 | 1161 | } |
989e5b96 JR |
1162 | |
1163 | module_init(sit_init); | |
1164 | module_exit(sit_cleanup); | |
39c85086 | 1165 | MODULE_LICENSE("GPL"); |
daccff02 | 1166 | MODULE_ALIAS("sit0"); |