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