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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 { | |
29182176 PE |
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 | ||
cd3dbc19 | 79 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
80 | }; |
81 | ||
1da177e4 LT |
82 | static DEFINE_RWLOCK(ipip6_lock); |
83 | ||
ca8def14 PE |
84 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
85 | __be32 remote, __be32 local) | |
1da177e4 LT |
86 | { |
87 | unsigned h0 = HASH(remote); | |
88 | unsigned h1 = HASH(local); | |
89 | struct ip_tunnel *t; | |
29182176 | 90 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 91 | |
29182176 | 92 | for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 LT |
93 | if (local == t->parms.iph.saddr && |
94 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
95 | return t; | |
96 | } | |
29182176 | 97 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { |
1da177e4 LT |
98 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
99 | return t; | |
100 | } | |
29182176 | 101 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { |
1da177e4 LT |
102 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
103 | return t; | |
104 | } | |
29182176 | 105 | if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) |
1da177e4 LT |
106 | return t; |
107 | return NULL; | |
108 | } | |
109 | ||
ca8def14 PE |
110 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
111 | struct ip_tunnel_parm *parms) | |
1da177e4 | 112 | { |
420fe234 YH |
113 | __be32 remote = parms->iph.daddr; |
114 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
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 | } | |
29182176 | 126 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
127 | } |
128 | ||
ca8def14 PE |
129 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
130 | struct ip_tunnel *t) | |
420fe234 | 131 | { |
ca8def14 | 132 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
133 | } |
134 | ||
ca8def14 | 135 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
136 | { |
137 | struct ip_tunnel **tp; | |
138 | ||
ca8def14 | 139 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
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 | ||
ca8def14 | 149 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 150 | { |
ca8def14 | 151 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
152 | |
153 | t->next = *tp; | |
154 | write_lock_bh(&ipip6_lock); | |
155 | *tp = t; | |
156 | write_unlock_bh(&ipip6_lock); | |
157 | } | |
158 | ||
ca8def14 PE |
159 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
160 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 161 | { |
e69a4adc AV |
162 | __be32 remote = parms->iph.daddr; |
163 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
164 | struct ip_tunnel *t, **tp, *nt; |
165 | struct net_device *dev; | |
1da177e4 | 166 | char name[IFNAMSIZ]; |
ca8def14 | 167 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 168 | |
ca8def14 | 169 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
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); | |
34cc7ba6 PE |
178 | else |
179 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
180 | |
181 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
182 | if (dev == NULL) | |
183 | return NULL; | |
184 | ||
7a97146c PE |
185 | dev_net_set(dev, net); |
186 | ||
b37d428b PE |
187 | if (strchr(name, '%')) { |
188 | if (dev_alloc_name(dev, name) < 0) | |
189 | goto failed_free; | |
190 | } | |
191 | ||
2941a486 | 192 | nt = netdev_priv(dev); |
1da177e4 LT |
193 | dev->init = ipip6_tunnel_init; |
194 | nt->parms = *parms; | |
195 | ||
c7dc89c0 FT |
196 | if (parms->i_flags & SIT_ISATAP) |
197 | dev->priv_flags |= IFF_ISATAP; | |
198 | ||
b37d428b PE |
199 | if (register_netdevice(dev) < 0) |
200 | goto failed_free; | |
1da177e4 LT |
201 | |
202 | dev_hold(dev); | |
203 | ||
ca8def14 | 204 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
205 | return nt; |
206 | ||
b37d428b PE |
207 | failed_free: |
208 | free_netdev(dev); | |
1da177e4 LT |
209 | failed: |
210 | return NULL; | |
211 | } | |
212 | ||
fadf6bf0 | 213 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 214 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
215 | { |
216 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
217 | ||
218 | for (p = t->prl; p; p = p->next) | |
300aaeea | 219 | if (p->addr == addr) |
fadf6bf0 TF |
220 | break; |
221 | return p; | |
222 | ||
223 | } | |
224 | ||
300aaeea YH |
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 | ||
fadf6bf0 TF |
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; | |
3fcfa129 YH |
290 | int err = 0; |
291 | ||
0009ae1f YH |
292 | if (a->addr == htonl(INADDR_ANY)) |
293 | return -EINVAL; | |
294 | ||
3fcfa129 | 295 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
296 | |
297 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 298 | if (p->addr == a->addr) { |
3fcfa129 YH |
299 | if (chg) |
300 | goto update; | |
301 | err = -EEXIST; | |
302 | goto out; | |
fadf6bf0 TF |
303 | } |
304 | } | |
305 | ||
3fcfa129 YH |
306 | if (chg) { |
307 | err = -ENXIO; | |
308 | goto out; | |
309 | } | |
fadf6bf0 TF |
310 | |
311 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
312 | if (!p) { |
313 | err = -ENOBUFS; | |
314 | goto out; | |
315 | } | |
fadf6bf0 | 316 | |
fadf6bf0 TF |
317 | p->next = t->prl; |
318 | t->prl = p; | |
300aaeea | 319 | t->prl_count++; |
3fcfa129 | 320 | update: |
300aaeea YH |
321 | p->addr = a->addr; |
322 | p->flags = a->flags; | |
3fcfa129 YH |
323 | out: |
324 | write_unlock(&ipip6_lock); | |
325 | return err; | |
fadf6bf0 TF |
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; | |
3fcfa129 YH |
332 | int err = 0; |
333 | ||
334 | write_lock(&ipip6_lock); | |
fadf6bf0 | 335 | |
0009ae1f | 336 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 337 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 338 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
339 | x = *p; |
340 | *p = x->next; | |
341 | kfree(x); | |
300aaeea | 342 | t->prl_count--; |
3fcfa129 | 343 | goto out; |
fadf6bf0 TF |
344 | } |
345 | } | |
3fcfa129 | 346 | err = -ENXIO; |
fadf6bf0 TF |
347 | } else { |
348 | while (t->prl) { | |
349 | x = t->prl; | |
350 | t->prl = t->prl->next; | |
351 | kfree(x); | |
300aaeea | 352 | t->prl_count--; |
fadf6bf0 TF |
353 | } |
354 | } | |
3fcfa129 YH |
355 | out: |
356 | write_unlock(&ipip6_lock); | |
fadf6bf0 TF |
357 | return 0; |
358 | } | |
359 | ||
fadf6bf0 TF |
360 | static int |
361 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
362 | { | |
3fcfa129 | 363 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
364 | int ok = 1; |
365 | ||
3fcfa129 YH |
366 | read_lock(&ipip6_lock); |
367 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 368 | if (p) { |
300aaeea | 369 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
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) && | |
52eeeb84 | 377 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
378 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
379 | else | |
380 | ok = 0; | |
381 | } | |
3fcfa129 | 382 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
383 | return ok; |
384 | } | |
385 | ||
1da177e4 LT |
386 | static void ipip6_tunnel_uninit(struct net_device *dev) |
387 | { | |
ca8def14 PE |
388 | struct net *net = dev_net(dev); |
389 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
390 | ||
cd3dbc19 | 391 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 | 392 | write_lock_bh(&ipip6_lock); |
29182176 | 393 | sitn->tunnels_wc[0] = NULL; |
1da177e4 LT |
394 | write_unlock_bh(&ipip6_lock); |
395 | dev_put(dev); | |
396 | } else { | |
ca8def14 | 397 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 398 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
399 | dev_put(dev); |
400 | } | |
401 | } | |
402 | ||
403 | ||
c73cb5a2 | 404 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 405 | { |
1da177e4 | 406 | |
071f92d0 | 407 | /* All the routers (except for Linux) return only |
1da177e4 LT |
408 | 8 bytes of packet payload. It means, that precise relaying of |
409 | ICMP in the real Internet is absolutely infeasible. | |
410 | */ | |
411 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
412 | const int type = icmp_hdr(skb)->type; |
413 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 414 | struct ip_tunnel *t; |
c73cb5a2 | 415 | int err; |
1da177e4 LT |
416 | |
417 | switch (type) { | |
418 | default: | |
419 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 420 | return 0; |
1da177e4 LT |
421 | |
422 | case ICMP_DEST_UNREACH: | |
423 | switch (code) { | |
424 | case ICMP_SR_FAILED: | |
425 | case ICMP_PORT_UNREACH: | |
426 | /* Impossible event. */ | |
c73cb5a2 | 427 | return 0; |
1da177e4 LT |
428 | case ICMP_FRAG_NEEDED: |
429 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 430 | return 0; |
1da177e4 LT |
431 | default: |
432 | /* All others are translated to HOST_UNREACH. | |
433 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
434 | I believe they are just ether pollution. --ANK | |
435 | */ | |
436 | break; | |
437 | } | |
438 | break; | |
439 | case ICMP_TIME_EXCEEDED: | |
440 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 441 | return 0; |
1da177e4 LT |
442 | break; |
443 | } | |
444 | ||
c73cb5a2 KM |
445 | err = -ENOENT; |
446 | ||
1da177e4 | 447 | read_lock(&ipip6_lock); |
fcee5ec9 | 448 | t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
449 | if (t == NULL || t->parms.iph.daddr == 0) |
450 | goto out; | |
c73cb5a2 KM |
451 | |
452 | err = 0; | |
1da177e4 LT |
453 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
454 | goto out; | |
455 | ||
456 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
457 | t->err_count++; | |
458 | else | |
459 | t->err_count = 1; | |
460 | t->err_time = jiffies; | |
461 | out: | |
462 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 463 | return err; |
1da177e4 LT |
464 | } |
465 | ||
466 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
467 | { | |
468 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 469 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
470 | } |
471 | ||
472 | static int ipip6_rcv(struct sk_buff *skb) | |
473 | { | |
474 | struct iphdr *iph; | |
475 | struct ip_tunnel *tunnel; | |
476 | ||
477 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
478 | goto out; | |
479 | ||
eddc9ec5 | 480 | iph = ip_hdr(skb); |
1da177e4 LT |
481 | |
482 | read_lock(&ipip6_lock); | |
fcee5ec9 | 483 | if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), |
ca8def14 | 484 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 | 485 | secpath_reset(skb); |
b0e380b1 | 486 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 487 | skb_reset_network_header(skb); |
8cdfab8a | 488 | IPCB(skb)->flags = 0; |
1da177e4 LT |
489 | skb->protocol = htons(ETH_P_IPV6); |
490 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
491 | |
492 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 493 | !isatap_chksrc(skb, iph, tunnel)) { |
c7dc89c0 FT |
494 | tunnel->stat.rx_errors++; |
495 | read_unlock(&ipip6_lock); | |
496 | kfree_skb(skb); | |
497 | return 0; | |
498 | } | |
1da177e4 LT |
499 | tunnel->stat.rx_packets++; |
500 | tunnel->stat.rx_bytes += skb->len; | |
501 | skb->dev = tunnel->dev; | |
502 | dst_release(skb->dst); | |
503 | skb->dst = NULL; | |
504 | nf_reset(skb); | |
505 | ipip6_ecn_decapsulate(iph, skb); | |
506 | netif_rx(skb); | |
507 | read_unlock(&ipip6_lock); | |
508 | return 0; | |
509 | } | |
510 | ||
45af08be | 511 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
512 | read_unlock(&ipip6_lock); |
513 | out: | |
36ca34cc | 514 | kfree_skb(skb); |
1da177e4 LT |
515 | return 0; |
516 | } | |
517 | ||
518 | /* Returns the embedded IPv4 address if the IPv6 address | |
519 | comes from 6to4 (RFC 3056) addr space */ | |
520 | ||
e69a4adc | 521 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 522 | { |
e69a4adc | 523 | __be32 dst = 0; |
1da177e4 LT |
524 | |
525 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 526 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
527 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
528 | } | |
529 | return dst; | |
530 | } | |
531 | ||
532 | /* | |
533 | * This function assumes it is being called from dev_queue_xmit() | |
534 | * and that skb is filled properly by that function. | |
535 | */ | |
536 | ||
537 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
538 | { | |
2941a486 | 539 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
540 | struct net_device_stats *stats = &tunnel->stat; |
541 | struct iphdr *tiph = &tunnel->parms.iph; | |
0660e03f | 542 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
543 | u8 tos = tunnel->parms.iph.tos; |
544 | struct rtable *rt; /* Route to the other host */ | |
545 | struct net_device *tdev; /* Device to other host */ | |
546 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 547 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 548 | __be32 dst = tiph->daddr; |
1da177e4 | 549 | int mtu; |
1ab1457c | 550 | struct in6_addr *addr6; |
1da177e4 LT |
551 | int addr_type; |
552 | ||
553 | if (tunnel->recursion++) { | |
554 | tunnel->stat.collisions++; | |
555 | goto tx_error; | |
556 | } | |
557 | ||
558 | if (skb->protocol != htons(ETH_P_IPV6)) | |
559 | goto tx_error; | |
560 | ||
c7dc89c0 FT |
561 | /* ISATAP (RFC4214) - must come before 6to4 */ |
562 | if (dev->priv_flags & IFF_ISATAP) { | |
563 | struct neighbour *neigh = NULL; | |
564 | ||
565 | if (skb->dst) | |
566 | neigh = skb->dst->neighbour; | |
567 | ||
568 | if (neigh == NULL) { | |
569 | if (net_ratelimit()) | |
570 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
571 | goto tx_error; | |
572 | } | |
573 | ||
574 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
575 | addr_type = ipv6_addr_type(addr6); | |
576 | ||
577 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
578 | ipv6_addr_is_isatap(addr6)) | |
579 | dst = addr6->s6_addr32[3]; | |
580 | else | |
581 | goto tx_error; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | if (!dst) |
585 | dst = try_6to4(&iph6->daddr); | |
586 | ||
587 | if (!dst) { | |
588 | struct neighbour *neigh = NULL; | |
589 | ||
590 | if (skb->dst) | |
591 | neigh = skb->dst->neighbour; | |
592 | ||
593 | if (neigh == NULL) { | |
594 | if (net_ratelimit()) | |
595 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
596 | goto tx_error; | |
597 | } | |
598 | ||
599 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
600 | addr_type = ipv6_addr_type(addr6); | |
601 | ||
602 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 603 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
604 | addr_type = ipv6_addr_type(addr6); |
605 | } | |
606 | ||
607 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
608 | goto tx_error_icmp; | |
609 | ||
610 | dst = addr6->s6_addr32[3]; | |
611 | } | |
612 | ||
613 | { | |
614 | struct flowi fl = { .nl_u = { .ip4_u = | |
615 | { .daddr = dst, | |
616 | .saddr = tiph->saddr, | |
617 | .tos = RT_TOS(tos) } }, | |
618 | .oif = tunnel->parms.link, | |
619 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 620 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1da177e4 LT |
621 | tunnel->stat.tx_carrier_errors++; |
622 | goto tx_error_icmp; | |
623 | } | |
624 | } | |
625 | if (rt->rt_type != RTN_UNICAST) { | |
626 | ip_rt_put(rt); | |
627 | tunnel->stat.tx_carrier_errors++; | |
628 | goto tx_error_icmp; | |
629 | } | |
630 | tdev = rt->u.dst.dev; | |
631 | ||
632 | if (tdev == dev) { | |
633 | ip_rt_put(rt); | |
634 | tunnel->stat.collisions++; | |
635 | goto tx_error; | |
636 | } | |
637 | ||
638 | if (tiph->frag_off) | |
639 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
640 | else | |
641 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
642 | ||
643 | if (mtu < 68) { | |
644 | tunnel->stat.collisions++; | |
645 | ip_rt_put(rt); | |
646 | goto tx_error; | |
647 | } | |
648 | if (mtu < IPV6_MIN_MTU) | |
649 | mtu = IPV6_MIN_MTU; | |
650 | if (tunnel->parms.iph.daddr && skb->dst) | |
651 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
652 | ||
653 | if (skb->len > mtu) { | |
654 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
655 | ip_rt_put(rt); | |
656 | goto tx_error; | |
657 | } | |
658 | ||
659 | if (tunnel->err_count > 0) { | |
660 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
661 | tunnel->err_count--; | |
662 | dst_link_failure(skb); | |
663 | } else | |
664 | tunnel->err_count = 0; | |
665 | } | |
666 | ||
667 | /* | |
668 | * Okay, now see if we can stuff it in the buffer as-is. | |
669 | */ | |
670 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
671 | ||
cfbba49d PM |
672 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
673 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
674 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
675 | if (!new_skb) { | |
676 | ip_rt_put(rt); | |
1ab1457c | 677 | stats->tx_dropped++; |
1da177e4 LT |
678 | dev_kfree_skb(skb); |
679 | tunnel->recursion--; | |
680 | return 0; | |
681 | } | |
682 | if (skb->sk) | |
683 | skb_set_owner_w(new_skb, skb->sk); | |
684 | dev_kfree_skb(skb); | |
685 | skb = new_skb; | |
0660e03f | 686 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
687 | } |
688 | ||
b0e380b1 | 689 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
690 | skb_push(skb, sizeof(struct iphdr)); |
691 | skb_reset_network_header(skb); | |
1da177e4 | 692 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 693 | IPCB(skb)->flags = 0; |
1da177e4 LT |
694 | dst_release(skb->dst); |
695 | skb->dst = &rt->u.dst; | |
696 | ||
697 | /* | |
698 | * Push down and install the IPIP header. | |
699 | */ | |
700 | ||
eddc9ec5 | 701 | iph = ip_hdr(skb); |
1da177e4 LT |
702 | iph->version = 4; |
703 | iph->ihl = sizeof(struct iphdr)>>2; | |
704 | if (mtu > IPV6_MIN_MTU) | |
705 | iph->frag_off = htons(IP_DF); | |
706 | else | |
707 | iph->frag_off = 0; | |
708 | ||
709 | iph->protocol = IPPROTO_IPV6; | |
710 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
711 | iph->daddr = rt->rt_dst; | |
712 | iph->saddr = rt->rt_src; | |
713 | ||
714 | if ((iph->ttl = tiph->ttl) == 0) | |
715 | iph->ttl = iph6->hop_limit; | |
716 | ||
717 | nf_reset(skb); | |
718 | ||
719 | IPTUNNEL_XMIT(); | |
720 | tunnel->recursion--; | |
721 | return 0; | |
722 | ||
723 | tx_error_icmp: | |
724 | dst_link_failure(skb); | |
725 | tx_error: | |
726 | stats->tx_errors++; | |
727 | dev_kfree_skb(skb); | |
728 | tunnel->recursion--; | |
729 | return 0; | |
730 | } | |
731 | ||
8a4a50f9 MS |
732 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
733 | { | |
734 | struct net_device *tdev = NULL; | |
735 | struct ip_tunnel *tunnel; | |
736 | struct iphdr *iph; | |
737 | ||
738 | tunnel = netdev_priv(dev); | |
739 | iph = &tunnel->parms.iph; | |
740 | ||
741 | if (iph->daddr) { | |
742 | struct flowi fl = { .nl_u = { .ip4_u = | |
743 | { .daddr = iph->daddr, | |
744 | .saddr = iph->saddr, | |
745 | .tos = RT_TOS(iph->tos) } }, | |
746 | .oif = tunnel->parms.link, | |
747 | .proto = IPPROTO_IPV6 }; | |
748 | struct rtable *rt; | |
907a08c4 | 749 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
750 | tdev = rt->u.dst.dev; |
751 | ip_rt_put(rt); | |
752 | } | |
753 | dev->flags |= IFF_POINTOPOINT; | |
754 | } | |
755 | ||
756 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 757 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
758 | |
759 | if (tdev) { | |
760 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
761 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
762 | if (dev->mtu < IPV6_MIN_MTU) | |
763 | dev->mtu = IPV6_MIN_MTU; | |
764 | } | |
765 | dev->iflink = tunnel->parms.link; | |
766 | } | |
767 | ||
1da177e4 LT |
768 | static int |
769 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
770 | { | |
771 | int err = 0; | |
772 | struct ip_tunnel_parm p; | |
fadf6bf0 | 773 | struct ip_tunnel_prl prl; |
1da177e4 | 774 | struct ip_tunnel *t; |
ca8def14 PE |
775 | struct net *net = dev_net(dev); |
776 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
777 | |
778 | switch (cmd) { | |
779 | case SIOCGETTUNNEL: | |
780 | t = NULL; | |
cd3dbc19 | 781 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
782 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
783 | err = -EFAULT; | |
784 | break; | |
785 | } | |
ca8def14 | 786 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
787 | } |
788 | if (t == NULL) | |
2941a486 | 789 | t = netdev_priv(dev); |
1da177e4 LT |
790 | memcpy(&p, &t->parms, sizeof(p)); |
791 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
792 | err = -EFAULT; | |
793 | break; | |
794 | ||
795 | case SIOCADDTUNNEL: | |
796 | case SIOCCHGTUNNEL: | |
797 | err = -EPERM; | |
798 | if (!capable(CAP_NET_ADMIN)) | |
799 | goto done; | |
800 | ||
801 | err = -EFAULT; | |
802 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
803 | goto done; | |
804 | ||
805 | err = -EINVAL; | |
806 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
807 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
808 | goto done; | |
809 | if (p.iph.ttl) | |
810 | p.iph.frag_off |= htons(IP_DF); | |
811 | ||
ca8def14 | 812 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 813 | |
cd3dbc19 | 814 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
815 | if (t != NULL) { |
816 | if (t->dev != dev) { | |
817 | err = -EEXIST; | |
818 | break; | |
819 | } | |
820 | } else { | |
821 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
822 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
823 | err = -EINVAL; | |
824 | break; | |
825 | } | |
2941a486 | 826 | t = netdev_priv(dev); |
ca8def14 | 827 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
828 | t->parms.iph.saddr = p.iph.saddr; |
829 | t->parms.iph.daddr = p.iph.daddr; | |
830 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
831 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 832 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
833 | netdev_state_change(dev); |
834 | } | |
835 | } | |
836 | ||
837 | if (t) { | |
838 | err = 0; | |
839 | if (cmd == SIOCCHGTUNNEL) { | |
840 | t->parms.iph.ttl = p.iph.ttl; | |
841 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
842 | if (t->parms.link != p.link) { |
843 | t->parms.link = p.link; | |
844 | ipip6_tunnel_bind_dev(dev); | |
845 | netdev_state_change(dev); | |
846 | } | |
1da177e4 LT |
847 | } |
848 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
849 | err = -EFAULT; | |
850 | } else | |
851 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
852 | break; | |
853 | ||
854 | case SIOCDELTUNNEL: | |
855 | err = -EPERM; | |
856 | if (!capable(CAP_NET_ADMIN)) | |
857 | goto done; | |
858 | ||
cd3dbc19 | 859 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
860 | err = -EFAULT; |
861 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
862 | goto done; | |
863 | err = -ENOENT; | |
ca8def14 | 864 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
865 | goto done; |
866 | err = -EPERM; | |
cd3dbc19 | 867 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
868 | goto done; |
869 | dev = t->dev; | |
870 | } | |
22f8cde5 SH |
871 | unregister_netdevice(dev); |
872 | err = 0; | |
1da177e4 LT |
873 | break; |
874 | ||
300aaeea | 875 | case SIOCGETPRL: |
fadf6bf0 TF |
876 | case SIOCADDPRL: |
877 | case SIOCDELPRL: | |
878 | case SIOCCHGPRL: | |
879 | err = -EPERM; | |
300aaeea | 880 | if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
881 | goto done; |
882 | err = -EINVAL; | |
cd3dbc19 | 883 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
884 | goto done; |
885 | err = -EFAULT; | |
886 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
887 | goto done; | |
888 | err = -ENOENT; | |
889 | if (!(t = netdev_priv(dev))) | |
890 | goto done; | |
891 | ||
300aaeea YH |
892 | switch (cmd) { |
893 | case SIOCGETPRL: | |
894 | err = ipip6_tunnel_get_prl(t, &prl); | |
895 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, | |
896 | &prl, sizeof(prl))) | |
897 | err = -EFAULT; | |
898 | break; | |
899 | case SIOCDELPRL: | |
fadf6bf0 | 900 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
901 | break; |
902 | case SIOCADDPRL: | |
903 | case SIOCCHGPRL: | |
fadf6bf0 | 904 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
905 | break; |
906 | } | |
907 | if (cmd != SIOCGETPRL) | |
908 | netdev_state_change(dev); | |
fadf6bf0 TF |
909 | break; |
910 | ||
1da177e4 LT |
911 | default: |
912 | err = -EINVAL; | |
913 | } | |
914 | ||
915 | done: | |
916 | return err; | |
917 | } | |
918 | ||
919 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
920 | { | |
2941a486 | 921 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
922 | } |
923 | ||
924 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
925 | { | |
926 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
927 | return -EINVAL; | |
928 | dev->mtu = new_mtu; | |
929 | return 0; | |
930 | } | |
931 | ||
932 | static void ipip6_tunnel_setup(struct net_device *dev) | |
933 | { | |
1da177e4 LT |
934 | dev->uninit = ipip6_tunnel_uninit; |
935 | dev->destructor = free_netdev; | |
936 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
937 | dev->get_stats = ipip6_tunnel_get_stats; | |
938 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
939 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
940 | ||
941 | dev->type = ARPHRD_SIT; | |
942 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 943 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
944 | dev->flags = IFF_NOARP; |
945 | dev->iflink = 0; | |
946 | dev->addr_len = 4; | |
7a97146c | 947 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
948 | } |
949 | ||
950 | static int ipip6_tunnel_init(struct net_device *dev) | |
951 | { | |
1da177e4 | 952 | struct ip_tunnel *tunnel; |
1da177e4 | 953 | |
2941a486 | 954 | tunnel = netdev_priv(dev); |
1da177e4 LT |
955 | |
956 | tunnel->dev = dev; | |
957 | strcpy(tunnel->parms.name, dev->name); | |
958 | ||
959 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
960 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
961 | ||
8a4a50f9 | 962 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
963 | |
964 | return 0; | |
965 | } | |
966 | ||
cd3dbc19 | 967 | static int ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 968 | { |
2941a486 | 969 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 970 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
971 | struct net *net = dev_net(dev); |
972 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
973 | |
974 | tunnel->dev = dev; | |
975 | strcpy(tunnel->parms.name, dev->name); | |
976 | ||
977 | iph->version = 4; | |
978 | iph->protocol = IPPROTO_IPV6; | |
979 | iph->ihl = 5; | |
980 | iph->ttl = 64; | |
981 | ||
982 | dev_hold(dev); | |
29182176 | 983 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
984 | return 0; |
985 | } | |
986 | ||
c73cb5a2 | 987 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
988 | .handler = ipip6_rcv, |
989 | .err_handler = ipip6_err, | |
c73cb5a2 | 990 | .priority = 1, |
1da177e4 LT |
991 | }; |
992 | ||
29182176 | 993 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
994 | { |
995 | int prio; | |
996 | ||
997 | for (prio = 1; prio < 4; prio++) { | |
998 | int h; | |
999 | for (h = 0; h < HASH_SIZE; h++) { | |
1000 | struct ip_tunnel *t; | |
29182176 | 1001 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1002 | unregister_netdevice(t->dev); |
1003 | } | |
1004 | } | |
1005 | } | |
1006 | ||
8190d900 PE |
1007 | static int sit_init_net(struct net *net) |
1008 | { | |
1009 | int err; | |
1010 | struct sit_net *sitn; | |
1011 | ||
1012 | err = -ENOMEM; | |
29182176 | 1013 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1014 | if (sitn == NULL) |
1015 | goto err_alloc; | |
1016 | ||
1017 | err = net_assign_generic(net, sit_net_id, sitn); | |
1018 | if (err < 0) | |
1019 | goto err_assign; | |
1020 | ||
29182176 PE |
1021 | sitn->tunnels[0] = sitn->tunnels_wc; |
1022 | sitn->tunnels[1] = sitn->tunnels_l; | |
1023 | sitn->tunnels[2] = sitn->tunnels_r; | |
1024 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1025 | ||
cd3dbc19 PE |
1026 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1027 | ipip6_tunnel_setup); | |
1028 | if (!sitn->fb_tunnel_dev) { | |
1029 | err = -ENOMEM; | |
1030 | goto err_alloc_dev; | |
1031 | } | |
1032 | ||
1033 | sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
1034 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1035 | ||
1036 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1037 | goto err_reg_dev; | |
1038 | ||
8190d900 PE |
1039 | return 0; |
1040 | ||
cd3dbc19 PE |
1041 | err_reg_dev: |
1042 | free_netdev(sitn->fb_tunnel_dev); | |
1043 | err_alloc_dev: | |
1044 | /* nothing */ | |
8190d900 PE |
1045 | err_assign: |
1046 | kfree(sitn); | |
1047 | err_alloc: | |
1048 | return err; | |
1049 | } | |
1050 | ||
1051 | static void sit_exit_net(struct net *net) | |
1052 | { | |
1053 | struct sit_net *sitn; | |
1054 | ||
1055 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1056 | rtnl_lock(); |
29182176 | 1057 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1058 | unregister_netdevice(sitn->fb_tunnel_dev); |
1059 | rtnl_unlock(); | |
8190d900 PE |
1060 | kfree(sitn); |
1061 | } | |
1062 | ||
1063 | static struct pernet_operations sit_net_ops = { | |
1064 | .init = sit_init_net, | |
1065 | .exit = sit_exit_net, | |
1066 | }; | |
1067 | ||
89c89458 | 1068 | static void __exit sit_cleanup(void) |
1da177e4 | 1069 | { |
c73cb5a2 | 1070 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1071 | |
8190d900 | 1072 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1073 | } |
1074 | ||
89c89458 | 1075 | static int __init sit_init(void) |
1da177e4 LT |
1076 | { |
1077 | int err; | |
1078 | ||
1079 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1080 | ||
c73cb5a2 | 1081 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1082 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1083 | return -EAGAIN; | |
1084 | } | |
1085 | ||
8190d900 PE |
1086 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1087 | if (err < 0) | |
cd3dbc19 | 1088 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1089 | |
1da177e4 | 1090 | return err; |
1da177e4 | 1091 | } |
989e5b96 JR |
1092 | |
1093 | module_init(sit_init); | |
1094 | module_exit(sit_cleanup); | |
39c85086 | 1095 | MODULE_LICENSE("GPL"); |
daccff02 | 1096 | MODULE_ALIAS("sit0"); |