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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 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | * | |
14 | * Changes: | |
15 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
16 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 17 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/module.h> |
4fc268d2 | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
1da177e4 LT |
26 | #include <linux/net.h> |
27 | #include <linux/in6.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/icmp.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 34 | #include <linux/if_ether.h> |
1da177e4 LT |
35 | |
36 | #include <net/sock.h> | |
37 | #include <net/snmp.h> | |
38 | ||
39 | #include <net/ipv6.h> | |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/ip6_fib.h> | |
43 | #include <net/ip6_route.h> | |
44 | #include <net/ndisc.h> | |
45 | #include <net/addrconf.h> | |
46 | #include <net/ip.h> | |
47 | #include <net/udp.h> | |
48 | #include <net/icmp.h> | |
49 | #include <net/ipip.h> | |
50 | #include <net/inet_ecn.h> | |
51 | #include <net/xfrm.h> | |
52 | #include <net/dsfield.h> | |
8190d900 PE |
53 | #include <net/net_namespace.h> |
54 | #include <net/netns/generic.h> | |
1da177e4 LT |
55 | |
56 | /* | |
57 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
58 | ||
59 | For comments look at net/ipv4/ip_gre.c --ANK | |
60 | */ | |
61 | ||
62 | #define HASH_SIZE 16 | |
e69a4adc | 63 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 | 64 | |
1326c3d5 SH |
65 | static void ipip6_fb_tunnel_init(struct net_device *dev); |
66 | static void ipip6_tunnel_init(struct net_device *dev); | |
1da177e4 LT |
67 | static void ipip6_tunnel_setup(struct net_device *dev); |
68 | ||
8190d900 PE |
69 | static int sit_net_id; |
70 | struct sit_net { | |
29182176 PE |
71 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
72 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
73 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
74 | struct ip_tunnel *tunnels_wc[1]; | |
75 | struct ip_tunnel **tunnels[4]; | |
76 | ||
cd3dbc19 | 77 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
78 | }; |
79 | ||
1da177e4 LT |
80 | static DEFINE_RWLOCK(ipip6_lock); |
81 | ||
ca8def14 PE |
82 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
83 | __be32 remote, __be32 local) | |
1da177e4 LT |
84 | { |
85 | unsigned h0 = HASH(remote); | |
86 | unsigned h1 = HASH(local); | |
87 | struct ip_tunnel *t; | |
29182176 | 88 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 89 | |
29182176 | 90 | for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 LT |
91 | if (local == t->parms.iph.saddr && |
92 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
93 | return t; | |
94 | } | |
29182176 | 95 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { |
1da177e4 LT |
96 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
97 | return t; | |
98 | } | |
29182176 | 99 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { |
1da177e4 LT |
100 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
101 | return t; | |
102 | } | |
29182176 | 103 | if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) |
1da177e4 LT |
104 | return t; |
105 | return NULL; | |
106 | } | |
107 | ||
ca8def14 PE |
108 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
109 | 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 | } | |
29182176 | 124 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
125 | } |
126 | ||
ca8def14 PE |
127 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
128 | struct ip_tunnel *t) | |
420fe234 | 129 | { |
ca8def14 | 130 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
131 | } |
132 | ||
ca8def14 | 133 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
134 | { |
135 | struct ip_tunnel **tp; | |
136 | ||
ca8def14 | 137 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
138 | if (t == *tp) { |
139 | write_lock_bh(&ipip6_lock); | |
140 | *tp = t->next; | |
141 | write_unlock_bh(&ipip6_lock); | |
142 | break; | |
143 | } | |
144 | } | |
145 | } | |
146 | ||
ca8def14 | 147 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 148 | { |
ca8def14 | 149 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
150 | |
151 | t->next = *tp; | |
152 | write_lock_bh(&ipip6_lock); | |
153 | *tp = t; | |
154 | write_unlock_bh(&ipip6_lock); | |
155 | } | |
156 | ||
ca8def14 PE |
157 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
158 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 159 | { |
e69a4adc AV |
160 | __be32 remote = parms->iph.daddr; |
161 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
162 | struct ip_tunnel *t, **tp, *nt; |
163 | struct net_device *dev; | |
1da177e4 | 164 | char name[IFNAMSIZ]; |
ca8def14 | 165 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 166 | |
ca8def14 | 167 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 SH |
168 | if (local == t->parms.iph.saddr && |
169 | remote == t->parms.iph.daddr) { | |
170 | if (create) | |
171 | return NULL; | |
172 | else | |
173 | return t; | |
174 | } | |
1da177e4 LT |
175 | } |
176 | if (!create) | |
177 | goto failed; | |
178 | ||
179 | if (parms->name[0]) | |
180 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
181 | else |
182 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
183 | |
184 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
185 | if (dev == NULL) | |
186 | return NULL; | |
187 | ||
7a97146c PE |
188 | dev_net_set(dev, net); |
189 | ||
b37d428b PE |
190 | if (strchr(name, '%')) { |
191 | if (dev_alloc_name(dev, name) < 0) | |
192 | goto failed_free; | |
193 | } | |
194 | ||
2941a486 | 195 | nt = netdev_priv(dev); |
1326c3d5 | 196 | |
1da177e4 | 197 | nt->parms = *parms; |
1b1d8f73 | 198 | ipip6_tunnel_init(dev); |
1da177e4 | 199 | |
c7dc89c0 FT |
200 | if (parms->i_flags & SIT_ISATAP) |
201 | dev->priv_flags |= IFF_ISATAP; | |
202 | ||
b37d428b PE |
203 | if (register_netdevice(dev) < 0) |
204 | goto failed_free; | |
1da177e4 LT |
205 | |
206 | dev_hold(dev); | |
207 | ||
ca8def14 | 208 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
209 | return nt; |
210 | ||
b37d428b PE |
211 | failed_free: |
212 | free_netdev(dev); | |
1da177e4 LT |
213 | failed: |
214 | return NULL; | |
215 | } | |
216 | ||
fadf6bf0 | 217 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 218 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
219 | { |
220 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
221 | ||
222 | for (p = t->prl; p; p = p->next) | |
300aaeea | 223 | if (p->addr == addr) |
fadf6bf0 TF |
224 | break; |
225 | return p; | |
226 | ||
227 | } | |
228 | ||
2b4743bd YH |
229 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
230 | struct ip_tunnel_prl __user *a) | |
300aaeea | 231 | { |
2b4743bd | 232 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
233 | struct ip_tunnel_prl_entry *prl; |
234 | unsigned int cmax, c = 0, ca, len; | |
235 | int ret = 0; | |
236 | ||
2b4743bd YH |
237 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
238 | return -EFAULT; | |
239 | cmax = kprl.datalen / sizeof(kprl); | |
240 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
241 | cmax = 1; |
242 | ||
243 | /* For simple GET or for root users, | |
244 | * we try harder to allocate. | |
245 | */ | |
246 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
247 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
248 | NULL; | |
249 | ||
250 | read_lock(&ipip6_lock); | |
251 | ||
252 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
253 | ||
254 | if (!kp) { | |
255 | /* We don't try hard to allocate much memory for | |
256 | * non-root users. | |
257 | * For root users, retry allocating enough memory for | |
258 | * the answer. | |
259 | */ | |
260 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
261 | if (!kp) { | |
262 | ret = -ENOMEM; | |
263 | goto out; | |
264 | } | |
265 | } | |
266 | ||
267 | c = 0; | |
268 | for (prl = t->prl; prl; prl = prl->next) { | |
269 | if (c > cmax) | |
270 | break; | |
2b4743bd | 271 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
272 | continue; |
273 | kp[c].addr = prl->addr; | |
274 | kp[c].flags = prl->flags; | |
275 | c++; | |
2b4743bd | 276 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
277 | break; |
278 | } | |
279 | out: | |
280 | read_unlock(&ipip6_lock); | |
281 | ||
282 | len = sizeof(*kp) * c; | |
2b4743bd YH |
283 | ret = 0; |
284 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
285 | ret = -EFAULT; | |
300aaeea YH |
286 | |
287 | kfree(kp); | |
300aaeea | 288 | |
2b4743bd | 289 | return ret; |
300aaeea YH |
290 | } |
291 | ||
fadf6bf0 TF |
292 | static int |
293 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
294 | { | |
295 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
296 | int err = 0; |
297 | ||
0009ae1f YH |
298 | if (a->addr == htonl(INADDR_ANY)) |
299 | return -EINVAL; | |
300 | ||
3fcfa129 | 301 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
302 | |
303 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 304 | if (p->addr == a->addr) { |
3fcfa129 YH |
305 | if (chg) |
306 | goto update; | |
307 | err = -EEXIST; | |
308 | goto out; | |
fadf6bf0 TF |
309 | } |
310 | } | |
311 | ||
3fcfa129 YH |
312 | if (chg) { |
313 | err = -ENXIO; | |
314 | goto out; | |
315 | } | |
fadf6bf0 TF |
316 | |
317 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
318 | if (!p) { |
319 | err = -ENOBUFS; | |
320 | goto out; | |
321 | } | |
fadf6bf0 | 322 | |
fadf6bf0 TF |
323 | p->next = t->prl; |
324 | t->prl = p; | |
300aaeea | 325 | t->prl_count++; |
3fcfa129 | 326 | update: |
300aaeea YH |
327 | p->addr = a->addr; |
328 | p->flags = a->flags; | |
3fcfa129 YH |
329 | out: |
330 | write_unlock(&ipip6_lock); | |
331 | return err; | |
fadf6bf0 TF |
332 | } |
333 | ||
334 | static int | |
335 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
336 | { | |
337 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
338 | int err = 0; |
339 | ||
340 | write_lock(&ipip6_lock); | |
fadf6bf0 | 341 | |
0009ae1f | 342 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 343 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 344 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
345 | x = *p; |
346 | *p = x->next; | |
347 | kfree(x); | |
300aaeea | 348 | t->prl_count--; |
3fcfa129 | 349 | goto out; |
fadf6bf0 TF |
350 | } |
351 | } | |
3fcfa129 | 352 | err = -ENXIO; |
fadf6bf0 TF |
353 | } else { |
354 | while (t->prl) { | |
355 | x = t->prl; | |
356 | t->prl = t->prl->next; | |
357 | kfree(x); | |
300aaeea | 358 | t->prl_count--; |
fadf6bf0 TF |
359 | } |
360 | } | |
3fcfa129 YH |
361 | out: |
362 | write_unlock(&ipip6_lock); | |
fadf6bf0 TF |
363 | return 0; |
364 | } | |
365 | ||
fadf6bf0 TF |
366 | static int |
367 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
368 | { | |
3fcfa129 | 369 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
370 | int ok = 1; |
371 | ||
3fcfa129 YH |
372 | read_lock(&ipip6_lock); |
373 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 374 | if (p) { |
300aaeea | 375 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
376 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
377 | else | |
378 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
379 | } else { | |
380 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
381 | if (ipv6_addr_is_isatap(addr6) && | |
382 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 383 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
384 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
385 | else | |
386 | ok = 0; | |
387 | } | |
3fcfa129 | 388 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
389 | return ok; |
390 | } | |
391 | ||
1da177e4 LT |
392 | static void ipip6_tunnel_uninit(struct net_device *dev) |
393 | { | |
ca8def14 PE |
394 | struct net *net = dev_net(dev); |
395 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
396 | ||
cd3dbc19 | 397 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 | 398 | write_lock_bh(&ipip6_lock); |
29182176 | 399 | sitn->tunnels_wc[0] = NULL; |
1da177e4 LT |
400 | write_unlock_bh(&ipip6_lock); |
401 | dev_put(dev); | |
402 | } else { | |
ca8def14 | 403 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 404 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
405 | dev_put(dev); |
406 | } | |
407 | } | |
408 | ||
409 | ||
c73cb5a2 | 410 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 411 | { |
1da177e4 | 412 | |
071f92d0 | 413 | /* All the routers (except for Linux) return only |
1da177e4 LT |
414 | 8 bytes of packet payload. It means, that precise relaying of |
415 | ICMP in the real Internet is absolutely infeasible. | |
416 | */ | |
417 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
418 | const int type = icmp_hdr(skb)->type; |
419 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 420 | struct ip_tunnel *t; |
c73cb5a2 | 421 | int err; |
1da177e4 LT |
422 | |
423 | switch (type) { | |
424 | default: | |
425 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 426 | return 0; |
1da177e4 LT |
427 | |
428 | case ICMP_DEST_UNREACH: | |
429 | switch (code) { | |
430 | case ICMP_SR_FAILED: | |
431 | case ICMP_PORT_UNREACH: | |
432 | /* Impossible event. */ | |
c73cb5a2 | 433 | return 0; |
1da177e4 LT |
434 | case ICMP_FRAG_NEEDED: |
435 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 436 | return 0; |
1da177e4 LT |
437 | default: |
438 | /* All others are translated to HOST_UNREACH. | |
439 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
440 | I believe they are just ether pollution. --ANK | |
441 | */ | |
442 | break; | |
443 | } | |
444 | break; | |
445 | case ICMP_TIME_EXCEEDED: | |
446 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 447 | return 0; |
1da177e4 LT |
448 | break; |
449 | } | |
450 | ||
c73cb5a2 KM |
451 | err = -ENOENT; |
452 | ||
1da177e4 | 453 | read_lock(&ipip6_lock); |
fcee5ec9 | 454 | t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
455 | if (t == NULL || t->parms.iph.daddr == 0) |
456 | goto out; | |
c73cb5a2 KM |
457 | |
458 | err = 0; | |
1da177e4 LT |
459 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
460 | goto out; | |
461 | ||
bb80087a | 462 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
463 | t->err_count++; |
464 | else | |
465 | t->err_count = 1; | |
466 | t->err_time = jiffies; | |
467 | out: | |
468 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 469 | return err; |
1da177e4 LT |
470 | } |
471 | ||
472 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
473 | { | |
474 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 475 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
476 | } |
477 | ||
478 | static int ipip6_rcv(struct sk_buff *skb) | |
479 | { | |
480 | struct iphdr *iph; | |
481 | struct ip_tunnel *tunnel; | |
482 | ||
483 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
484 | goto out; | |
485 | ||
eddc9ec5 | 486 | iph = ip_hdr(skb); |
1da177e4 LT |
487 | |
488 | read_lock(&ipip6_lock); | |
fcee5ec9 | 489 | if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), |
ca8def14 | 490 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 | 491 | secpath_reset(skb); |
b0e380b1 | 492 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 493 | skb_reset_network_header(skb); |
8cdfab8a | 494 | IPCB(skb)->flags = 0; |
1da177e4 LT |
495 | skb->protocol = htons(ETH_P_IPV6); |
496 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
497 | |
498 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 499 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 500 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
501 | read_unlock(&ipip6_lock); |
502 | kfree_skb(skb); | |
503 | return 0; | |
504 | } | |
4eecc107 PE |
505 | tunnel->dev->stats.rx_packets++; |
506 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
507 | skb->dev = tunnel->dev; |
508 | dst_release(skb->dst); | |
509 | skb->dst = NULL; | |
510 | nf_reset(skb); | |
511 | ipip6_ecn_decapsulate(iph, skb); | |
512 | netif_rx(skb); | |
513 | read_unlock(&ipip6_lock); | |
514 | return 0; | |
515 | } | |
516 | ||
45af08be | 517 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
518 | read_unlock(&ipip6_lock); |
519 | out: | |
36ca34cc | 520 | kfree_skb(skb); |
1da177e4 LT |
521 | return 0; |
522 | } | |
523 | ||
524 | /* Returns the embedded IPv4 address if the IPv6 address | |
525 | comes from 6to4 (RFC 3056) addr space */ | |
526 | ||
e69a4adc | 527 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 528 | { |
e69a4adc | 529 | __be32 dst = 0; |
1da177e4 LT |
530 | |
531 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 532 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
533 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
534 | } | |
535 | return dst; | |
536 | } | |
537 | ||
538 | /* | |
539 | * This function assumes it is being called from dev_queue_xmit() | |
540 | * and that skb is filled properly by that function. | |
541 | */ | |
542 | ||
543 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
544 | { | |
2941a486 | 545 | struct ip_tunnel *tunnel = netdev_priv(dev); |
4eecc107 | 546 | struct net_device_stats *stats = &tunnel->dev->stats; |
1da177e4 | 547 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 548 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
549 | u8 tos = tunnel->parms.iph.tos; |
550 | struct rtable *rt; /* Route to the other host */ | |
551 | struct net_device *tdev; /* Device to other host */ | |
552 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 553 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 554 | __be32 dst = tiph->daddr; |
1da177e4 | 555 | int mtu; |
1ab1457c | 556 | struct in6_addr *addr6; |
1da177e4 LT |
557 | int addr_type; |
558 | ||
559 | if (tunnel->recursion++) { | |
4eecc107 | 560 | stats->collisions++; |
1da177e4 LT |
561 | goto tx_error; |
562 | } | |
563 | ||
564 | if (skb->protocol != htons(ETH_P_IPV6)) | |
565 | goto tx_error; | |
566 | ||
c7dc89c0 FT |
567 | /* ISATAP (RFC4214) - must come before 6to4 */ |
568 | if (dev->priv_flags & IFF_ISATAP) { | |
569 | struct neighbour *neigh = NULL; | |
570 | ||
571 | if (skb->dst) | |
572 | neigh = skb->dst->neighbour; | |
573 | ||
574 | if (neigh == NULL) { | |
575 | if (net_ratelimit()) | |
576 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
577 | goto tx_error; | |
578 | } | |
579 | ||
580 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
581 | addr_type = ipv6_addr_type(addr6); | |
582 | ||
583 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
584 | ipv6_addr_is_isatap(addr6)) | |
585 | dst = addr6->s6_addr32[3]; | |
586 | else | |
587 | goto tx_error; | |
588 | } | |
589 | ||
1da177e4 LT |
590 | if (!dst) |
591 | dst = try_6to4(&iph6->daddr); | |
592 | ||
593 | if (!dst) { | |
594 | struct neighbour *neigh = NULL; | |
595 | ||
596 | if (skb->dst) | |
597 | neigh = skb->dst->neighbour; | |
598 | ||
599 | if (neigh == NULL) { | |
600 | if (net_ratelimit()) | |
601 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
602 | goto tx_error; | |
603 | } | |
604 | ||
605 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
606 | addr_type = ipv6_addr_type(addr6); | |
607 | ||
608 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 609 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
610 | addr_type = ipv6_addr_type(addr6); |
611 | } | |
612 | ||
613 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
614 | goto tx_error_icmp; | |
615 | ||
616 | dst = addr6->s6_addr32[3]; | |
617 | } | |
618 | ||
619 | { | |
620 | struct flowi fl = { .nl_u = { .ip4_u = | |
621 | { .daddr = dst, | |
622 | .saddr = tiph->saddr, | |
623 | .tos = RT_TOS(tos) } }, | |
624 | .oif = tunnel->parms.link, | |
625 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 626 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 627 | stats->tx_carrier_errors++; |
1da177e4 LT |
628 | goto tx_error_icmp; |
629 | } | |
630 | } | |
631 | if (rt->rt_type != RTN_UNICAST) { | |
632 | ip_rt_put(rt); | |
4eecc107 | 633 | stats->tx_carrier_errors++; |
1da177e4 LT |
634 | goto tx_error_icmp; |
635 | } | |
636 | tdev = rt->u.dst.dev; | |
637 | ||
638 | if (tdev == dev) { | |
639 | ip_rt_put(rt); | |
4eecc107 | 640 | stats->collisions++; |
1da177e4 LT |
641 | goto tx_error; |
642 | } | |
643 | ||
644 | if (tiph->frag_off) | |
645 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
646 | else | |
647 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
648 | ||
649 | if (mtu < 68) { | |
4eecc107 | 650 | stats->collisions++; |
1da177e4 LT |
651 | ip_rt_put(rt); |
652 | goto tx_error; | |
653 | } | |
654 | if (mtu < IPV6_MIN_MTU) | |
655 | mtu = IPV6_MIN_MTU; | |
656 | if (tunnel->parms.iph.daddr && skb->dst) | |
657 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
658 | ||
659 | if (skb->len > mtu) { | |
660 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
661 | ip_rt_put(rt); | |
662 | goto tx_error; | |
663 | } | |
664 | ||
665 | if (tunnel->err_count > 0) { | |
bb80087a WY |
666 | if (time_before(jiffies, |
667 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
668 | tunnel->err_count--; |
669 | dst_link_failure(skb); | |
670 | } else | |
671 | tunnel->err_count = 0; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Okay, now see if we can stuff it in the buffer as-is. | |
676 | */ | |
677 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
678 | ||
cfbba49d PM |
679 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
680 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
681 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
682 | if (!new_skb) { | |
683 | ip_rt_put(rt); | |
1ab1457c | 684 | stats->tx_dropped++; |
1da177e4 LT |
685 | dev_kfree_skb(skb); |
686 | tunnel->recursion--; | |
687 | return 0; | |
688 | } | |
689 | if (skb->sk) | |
690 | skb_set_owner_w(new_skb, skb->sk); | |
691 | dev_kfree_skb(skb); | |
692 | skb = new_skb; | |
0660e03f | 693 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
694 | } |
695 | ||
b0e380b1 | 696 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
697 | skb_push(skb, sizeof(struct iphdr)); |
698 | skb_reset_network_header(skb); | |
1da177e4 | 699 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 700 | IPCB(skb)->flags = 0; |
1da177e4 LT |
701 | dst_release(skb->dst); |
702 | skb->dst = &rt->u.dst; | |
703 | ||
704 | /* | |
705 | * Push down and install the IPIP header. | |
706 | */ | |
707 | ||
eddc9ec5 | 708 | iph = ip_hdr(skb); |
1da177e4 LT |
709 | iph->version = 4; |
710 | iph->ihl = sizeof(struct iphdr)>>2; | |
711 | if (mtu > IPV6_MIN_MTU) | |
712 | iph->frag_off = htons(IP_DF); | |
713 | else | |
714 | iph->frag_off = 0; | |
715 | ||
716 | iph->protocol = IPPROTO_IPV6; | |
717 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
718 | iph->daddr = rt->rt_dst; | |
719 | iph->saddr = rt->rt_src; | |
720 | ||
721 | if ((iph->ttl = tiph->ttl) == 0) | |
722 | iph->ttl = iph6->hop_limit; | |
723 | ||
724 | nf_reset(skb); | |
725 | ||
726 | IPTUNNEL_XMIT(); | |
727 | tunnel->recursion--; | |
728 | return 0; | |
729 | ||
730 | tx_error_icmp: | |
731 | dst_link_failure(skb); | |
732 | tx_error: | |
733 | stats->tx_errors++; | |
734 | dev_kfree_skb(skb); | |
735 | tunnel->recursion--; | |
736 | return 0; | |
737 | } | |
738 | ||
8a4a50f9 MS |
739 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
740 | { | |
741 | struct net_device *tdev = NULL; | |
742 | struct ip_tunnel *tunnel; | |
743 | struct iphdr *iph; | |
744 | ||
745 | tunnel = netdev_priv(dev); | |
746 | iph = &tunnel->parms.iph; | |
747 | ||
748 | if (iph->daddr) { | |
749 | struct flowi fl = { .nl_u = { .ip4_u = | |
750 | { .daddr = iph->daddr, | |
751 | .saddr = iph->saddr, | |
752 | .tos = RT_TOS(iph->tos) } }, | |
753 | .oif = tunnel->parms.link, | |
754 | .proto = IPPROTO_IPV6 }; | |
755 | struct rtable *rt; | |
907a08c4 | 756 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
757 | tdev = rt->u.dst.dev; |
758 | ip_rt_put(rt); | |
759 | } | |
760 | dev->flags |= IFF_POINTOPOINT; | |
761 | } | |
762 | ||
763 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 764 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
765 | |
766 | if (tdev) { | |
767 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
768 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
769 | if (dev->mtu < IPV6_MIN_MTU) | |
770 | dev->mtu = IPV6_MIN_MTU; | |
771 | } | |
772 | dev->iflink = tunnel->parms.link; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | static int |
776 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
777 | { | |
778 | int err = 0; | |
779 | struct ip_tunnel_parm p; | |
fadf6bf0 | 780 | struct ip_tunnel_prl prl; |
1da177e4 | 781 | struct ip_tunnel *t; |
ca8def14 PE |
782 | struct net *net = dev_net(dev); |
783 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
784 | |
785 | switch (cmd) { | |
786 | case SIOCGETTUNNEL: | |
787 | t = NULL; | |
cd3dbc19 | 788 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
789 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
790 | err = -EFAULT; | |
791 | break; | |
792 | } | |
ca8def14 | 793 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
794 | } |
795 | if (t == NULL) | |
2941a486 | 796 | t = netdev_priv(dev); |
1da177e4 LT |
797 | memcpy(&p, &t->parms, sizeof(p)); |
798 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
799 | err = -EFAULT; | |
800 | break; | |
801 | ||
802 | case SIOCADDTUNNEL: | |
803 | case SIOCCHGTUNNEL: | |
804 | err = -EPERM; | |
805 | if (!capable(CAP_NET_ADMIN)) | |
806 | goto done; | |
807 | ||
808 | err = -EFAULT; | |
809 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
810 | goto done; | |
811 | ||
812 | err = -EINVAL; | |
813 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
814 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
815 | goto done; | |
816 | if (p.iph.ttl) | |
817 | p.iph.frag_off |= htons(IP_DF); | |
818 | ||
ca8def14 | 819 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 820 | |
cd3dbc19 | 821 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
822 | if (t != NULL) { |
823 | if (t->dev != dev) { | |
824 | err = -EEXIST; | |
825 | break; | |
826 | } | |
827 | } else { | |
828 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
829 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
830 | err = -EINVAL; | |
831 | break; | |
832 | } | |
2941a486 | 833 | t = netdev_priv(dev); |
ca8def14 | 834 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
835 | t->parms.iph.saddr = p.iph.saddr; |
836 | t->parms.iph.daddr = p.iph.daddr; | |
837 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
838 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 839 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
840 | netdev_state_change(dev); |
841 | } | |
842 | } | |
843 | ||
844 | if (t) { | |
845 | err = 0; | |
846 | if (cmd == SIOCCHGTUNNEL) { | |
847 | t->parms.iph.ttl = p.iph.ttl; | |
848 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
849 | if (t->parms.link != p.link) { |
850 | t->parms.link = p.link; | |
851 | ipip6_tunnel_bind_dev(dev); | |
852 | netdev_state_change(dev); | |
853 | } | |
1da177e4 LT |
854 | } |
855 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
856 | err = -EFAULT; | |
857 | } else | |
858 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
859 | break; | |
860 | ||
861 | case SIOCDELTUNNEL: | |
862 | err = -EPERM; | |
863 | if (!capable(CAP_NET_ADMIN)) | |
864 | goto done; | |
865 | ||
cd3dbc19 | 866 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
867 | err = -EFAULT; |
868 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
869 | goto done; | |
870 | err = -ENOENT; | |
ca8def14 | 871 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
872 | goto done; |
873 | err = -EPERM; | |
cd3dbc19 | 874 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
875 | goto done; |
876 | dev = t->dev; | |
877 | } | |
22f8cde5 SH |
878 | unregister_netdevice(dev); |
879 | err = 0; | |
1da177e4 LT |
880 | break; |
881 | ||
300aaeea | 882 | case SIOCGETPRL: |
2b4743bd YH |
883 | err = -EINVAL; |
884 | if (dev == sitn->fb_tunnel_dev) | |
885 | goto done; | |
886 | err = -ENOENT; | |
887 | if (!(t = netdev_priv(dev))) | |
888 | goto done; | |
889 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
890 | break; | |
891 | ||
fadf6bf0 TF |
892 | case SIOCADDPRL: |
893 | case SIOCDELPRL: | |
894 | case SIOCCHGPRL: | |
895 | err = -EPERM; | |
2b4743bd | 896 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
897 | goto done; |
898 | err = -EINVAL; | |
cd3dbc19 | 899 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
900 | goto done; |
901 | err = -EFAULT; | |
902 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
903 | goto done; | |
904 | err = -ENOENT; | |
905 | if (!(t = netdev_priv(dev))) | |
906 | goto done; | |
907 | ||
300aaeea | 908 | switch (cmd) { |
300aaeea | 909 | case SIOCDELPRL: |
fadf6bf0 | 910 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
911 | break; |
912 | case SIOCADDPRL: | |
913 | case SIOCCHGPRL: | |
fadf6bf0 | 914 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
915 | break; |
916 | } | |
2b4743bd | 917 | netdev_state_change(dev); |
fadf6bf0 TF |
918 | break; |
919 | ||
1da177e4 LT |
920 | default: |
921 | err = -EINVAL; | |
922 | } | |
923 | ||
924 | done: | |
925 | return err; | |
926 | } | |
927 | ||
1da177e4 LT |
928 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
929 | { | |
930 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
931 | return -EINVAL; | |
932 | dev->mtu = new_mtu; | |
933 | return 0; | |
934 | } | |
935 | ||
1326c3d5 SH |
936 | static const struct net_device_ops ipip6_netdev_ops = { |
937 | .ndo_uninit = ipip6_tunnel_uninit, | |
938 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
939 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
940 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
941 | }; | |
942 | ||
1da177e4 LT |
943 | static void ipip6_tunnel_setup(struct net_device *dev) |
944 | { | |
1326c3d5 | 945 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 946 | dev->destructor = free_netdev; |
1da177e4 LT |
947 | |
948 | dev->type = ARPHRD_SIT; | |
949 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 950 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
951 | dev->flags = IFF_NOARP; |
952 | dev->iflink = 0; | |
953 | dev->addr_len = 4; | |
7a97146c | 954 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
955 | } |
956 | ||
1326c3d5 | 957 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 958 | { |
1326c3d5 | 959 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
960 | |
961 | tunnel->dev = dev; | |
962 | strcpy(tunnel->parms.name, dev->name); | |
963 | ||
964 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
965 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
966 | ||
8a4a50f9 | 967 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
968 | } |
969 | ||
1326c3d5 | 970 | static void ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 971 | { |
2941a486 | 972 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 973 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
974 | struct net *net = dev_net(dev); |
975 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
976 | |
977 | tunnel->dev = dev; | |
978 | strcpy(tunnel->parms.name, dev->name); | |
979 | ||
980 | iph->version = 4; | |
981 | iph->protocol = IPPROTO_IPV6; | |
982 | iph->ihl = 5; | |
983 | iph->ttl = 64; | |
984 | ||
985 | dev_hold(dev); | |
29182176 | 986 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
987 | } |
988 | ||
c73cb5a2 | 989 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
990 | .handler = ipip6_rcv, |
991 | .err_handler = ipip6_err, | |
c73cb5a2 | 992 | .priority = 1, |
1da177e4 LT |
993 | }; |
994 | ||
29182176 | 995 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
996 | { |
997 | int prio; | |
998 | ||
999 | for (prio = 1; prio < 4; prio++) { | |
1000 | int h; | |
1001 | for (h = 0; h < HASH_SIZE; h++) { | |
1002 | struct ip_tunnel *t; | |
29182176 | 1003 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1004 | unregister_netdevice(t->dev); |
1005 | } | |
1006 | } | |
1007 | } | |
1008 | ||
8190d900 PE |
1009 | static int sit_init_net(struct net *net) |
1010 | { | |
1011 | int err; | |
1012 | struct sit_net *sitn; | |
1013 | ||
1014 | err = -ENOMEM; | |
29182176 | 1015 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1016 | if (sitn == NULL) |
1017 | goto err_alloc; | |
1018 | ||
1019 | err = net_assign_generic(net, sit_net_id, sitn); | |
1020 | if (err < 0) | |
1021 | goto err_assign; | |
1022 | ||
29182176 PE |
1023 | sitn->tunnels[0] = sitn->tunnels_wc; |
1024 | sitn->tunnels[1] = sitn->tunnels_l; | |
1025 | sitn->tunnels[2] = sitn->tunnels_r; | |
1026 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1027 | ||
cd3dbc19 PE |
1028 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1029 | ipip6_tunnel_setup); | |
1030 | if (!sitn->fb_tunnel_dev) { | |
1031 | err = -ENOMEM; | |
1032 | goto err_alloc_dev; | |
1033 | } | |
be77e593 | 1034 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1035 | |
1326c3d5 | 1036 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1037 | |
1038 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1039 | goto err_reg_dev; | |
1040 | ||
8190d900 PE |
1041 | return 0; |
1042 | ||
cd3dbc19 | 1043 | err_reg_dev: |
1326c3d5 | 1044 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1045 | free_netdev(sitn->fb_tunnel_dev); |
1046 | err_alloc_dev: | |
1047 | /* nothing */ | |
8190d900 PE |
1048 | err_assign: |
1049 | kfree(sitn); | |
1050 | err_alloc: | |
1051 | return err; | |
1052 | } | |
1053 | ||
1054 | static void sit_exit_net(struct net *net) | |
1055 | { | |
1056 | struct sit_net *sitn; | |
1057 | ||
1058 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1059 | rtnl_lock(); |
29182176 | 1060 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1061 | unregister_netdevice(sitn->fb_tunnel_dev); |
1062 | rtnl_unlock(); | |
8190d900 PE |
1063 | kfree(sitn); |
1064 | } | |
1065 | ||
1066 | static struct pernet_operations sit_net_ops = { | |
1067 | .init = sit_init_net, | |
1068 | .exit = sit_exit_net, | |
1069 | }; | |
1070 | ||
89c89458 | 1071 | static void __exit sit_cleanup(void) |
1da177e4 | 1072 | { |
c73cb5a2 | 1073 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1074 | |
8190d900 | 1075 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1076 | } |
1077 | ||
89c89458 | 1078 | static int __init sit_init(void) |
1da177e4 LT |
1079 | { |
1080 | int err; | |
1081 | ||
1082 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1083 | ||
c73cb5a2 | 1084 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1085 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1086 | return -EAGAIN; | |
1087 | } | |
1088 | ||
8190d900 PE |
1089 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1090 | if (err < 0) | |
cd3dbc19 | 1091 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1092 | |
1da177e4 | 1093 | return err; |
1da177e4 | 1094 | } |
989e5b96 JR |
1095 | |
1096 | module_init(sit_init); | |
1097 | module_exit(sit_cleanup); | |
39c85086 | 1098 | MODULE_LICENSE("GPL"); |
daccff02 | 1099 | MODULE_ALIAS("sit0"); |