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 | 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 | 82 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
4fddbf5d | 83 | struct net_device *dev, __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 | 91 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
92 | remote == t->parms.iph.daddr && |
93 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
94 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
95 | return t; |
96 | } | |
29182176 | 97 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { |
4fddbf5d SH |
98 | if (remote == t->parms.iph.daddr && |
99 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
100 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
101 | return t; |
102 | } | |
29182176 | 103 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { |
4fddbf5d SH |
104 | if (local == t->parms.iph.saddr && |
105 | (!dev || !t->parms.link || dev->iflink == t->parms.link) && | |
106 | (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
107 | return t; |
108 | } | |
4fddbf5d SH |
109 | t = sitn->tunnels_wc[0]; |
110 | if ((t != NULL) && (t->dev->flags & IFF_UP)) | |
1da177e4 LT |
111 | return t; |
112 | return NULL; | |
113 | } | |
114 | ||
ca8def14 PE |
115 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
116 | struct ip_tunnel_parm *parms) | |
1da177e4 | 117 | { |
420fe234 YH |
118 | __be32 remote = parms->iph.daddr; |
119 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
120 | unsigned h = 0; |
121 | int prio = 0; | |
122 | ||
123 | if (remote) { | |
124 | prio |= 2; | |
125 | h ^= HASH(remote); | |
126 | } | |
127 | if (local) { | |
128 | prio |= 1; | |
129 | h ^= HASH(local); | |
130 | } | |
29182176 | 131 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
132 | } |
133 | ||
ca8def14 PE |
134 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
135 | struct ip_tunnel *t) | |
420fe234 | 136 | { |
ca8def14 | 137 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
138 | } |
139 | ||
ca8def14 | 140 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
141 | { |
142 | struct ip_tunnel **tp; | |
143 | ||
ca8def14 | 144 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
145 | if (t == *tp) { |
146 | write_lock_bh(&ipip6_lock); | |
147 | *tp = t->next; | |
148 | write_unlock_bh(&ipip6_lock); | |
149 | break; | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
ca8def14 | 154 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 155 | { |
ca8def14 | 156 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
157 | |
158 | t->next = *tp; | |
159 | write_lock_bh(&ipip6_lock); | |
160 | *tp = t; | |
161 | write_unlock_bh(&ipip6_lock); | |
162 | } | |
163 | ||
ca8def14 PE |
164 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
165 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 166 | { |
e69a4adc AV |
167 | __be32 remote = parms->iph.daddr; |
168 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
169 | struct ip_tunnel *t, **tp, *nt; |
170 | struct net_device *dev; | |
1da177e4 | 171 | char name[IFNAMSIZ]; |
ca8def14 | 172 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 173 | |
ca8def14 | 174 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 | 175 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
176 | remote == t->parms.iph.daddr && |
177 | parms->link == t->parms.link) { | |
8db99e57 SH |
178 | if (create) |
179 | return NULL; | |
180 | else | |
181 | return t; | |
182 | } | |
1da177e4 LT |
183 | } |
184 | if (!create) | |
185 | goto failed; | |
186 | ||
187 | if (parms->name[0]) | |
188 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
189 | else |
190 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
191 | |
192 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
193 | if (dev == NULL) | |
194 | return NULL; | |
195 | ||
7a97146c PE |
196 | dev_net_set(dev, net); |
197 | ||
b37d428b PE |
198 | if (strchr(name, '%')) { |
199 | if (dev_alloc_name(dev, name) < 0) | |
200 | goto failed_free; | |
201 | } | |
202 | ||
2941a486 | 203 | nt = netdev_priv(dev); |
1326c3d5 | 204 | |
1da177e4 | 205 | nt->parms = *parms; |
1b1d8f73 | 206 | ipip6_tunnel_init(dev); |
1da177e4 | 207 | |
c7dc89c0 FT |
208 | if (parms->i_flags & SIT_ISATAP) |
209 | dev->priv_flags |= IFF_ISATAP; | |
210 | ||
b37d428b PE |
211 | if (register_netdevice(dev) < 0) |
212 | goto failed_free; | |
1da177e4 LT |
213 | |
214 | dev_hold(dev); | |
215 | ||
ca8def14 | 216 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
217 | return nt; |
218 | ||
b37d428b PE |
219 | failed_free: |
220 | free_netdev(dev); | |
1da177e4 LT |
221 | failed: |
222 | return NULL; | |
223 | } | |
224 | ||
fadf6bf0 | 225 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 226 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
227 | { |
228 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
229 | ||
230 | for (p = t->prl; p; p = p->next) | |
300aaeea | 231 | if (p->addr == addr) |
fadf6bf0 TF |
232 | break; |
233 | return p; | |
234 | ||
235 | } | |
236 | ||
2b4743bd YH |
237 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
238 | struct ip_tunnel_prl __user *a) | |
300aaeea | 239 | { |
2b4743bd | 240 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
241 | struct ip_tunnel_prl_entry *prl; |
242 | unsigned int cmax, c = 0, ca, len; | |
243 | int ret = 0; | |
244 | ||
2b4743bd YH |
245 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
246 | return -EFAULT; | |
247 | cmax = kprl.datalen / sizeof(kprl); | |
248 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
249 | cmax = 1; |
250 | ||
251 | /* For simple GET or for root users, | |
252 | * we try harder to allocate. | |
253 | */ | |
254 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
255 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
256 | NULL; | |
257 | ||
258 | read_lock(&ipip6_lock); | |
259 | ||
260 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
261 | ||
262 | if (!kp) { | |
263 | /* We don't try hard to allocate much memory for | |
264 | * non-root users. | |
265 | * For root users, retry allocating enough memory for | |
266 | * the answer. | |
267 | */ | |
268 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
269 | if (!kp) { | |
270 | ret = -ENOMEM; | |
271 | goto out; | |
272 | } | |
273 | } | |
274 | ||
275 | c = 0; | |
276 | for (prl = t->prl; prl; prl = prl->next) { | |
277 | if (c > cmax) | |
278 | break; | |
2b4743bd | 279 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
280 | continue; |
281 | kp[c].addr = prl->addr; | |
282 | kp[c].flags = prl->flags; | |
283 | c++; | |
2b4743bd | 284 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
285 | break; |
286 | } | |
287 | out: | |
288 | read_unlock(&ipip6_lock); | |
289 | ||
290 | len = sizeof(*kp) * c; | |
2b4743bd YH |
291 | ret = 0; |
292 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
293 | ret = -EFAULT; | |
300aaeea YH |
294 | |
295 | kfree(kp); | |
300aaeea | 296 | |
2b4743bd | 297 | return ret; |
300aaeea YH |
298 | } |
299 | ||
fadf6bf0 TF |
300 | static int |
301 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
302 | { | |
303 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
304 | int err = 0; |
305 | ||
0009ae1f YH |
306 | if (a->addr == htonl(INADDR_ANY)) |
307 | return -EINVAL; | |
308 | ||
3fcfa129 | 309 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
310 | |
311 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 312 | if (p->addr == a->addr) { |
3fcfa129 YH |
313 | if (chg) |
314 | goto update; | |
315 | err = -EEXIST; | |
316 | goto out; | |
fadf6bf0 TF |
317 | } |
318 | } | |
319 | ||
3fcfa129 YH |
320 | if (chg) { |
321 | err = -ENXIO; | |
322 | goto out; | |
323 | } | |
fadf6bf0 TF |
324 | |
325 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
326 | if (!p) { |
327 | err = -ENOBUFS; | |
328 | goto out; | |
329 | } | |
fadf6bf0 | 330 | |
fadf6bf0 TF |
331 | p->next = t->prl; |
332 | t->prl = p; | |
300aaeea | 333 | t->prl_count++; |
3fcfa129 | 334 | update: |
300aaeea YH |
335 | p->addr = a->addr; |
336 | p->flags = a->flags; | |
3fcfa129 YH |
337 | out: |
338 | write_unlock(&ipip6_lock); | |
339 | return err; | |
fadf6bf0 TF |
340 | } |
341 | ||
342 | static int | |
343 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
344 | { | |
345 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
346 | int err = 0; |
347 | ||
348 | write_lock(&ipip6_lock); | |
fadf6bf0 | 349 | |
0009ae1f | 350 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 351 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 352 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
353 | x = *p; |
354 | *p = x->next; | |
355 | kfree(x); | |
300aaeea | 356 | t->prl_count--; |
3fcfa129 | 357 | goto out; |
fadf6bf0 TF |
358 | } |
359 | } | |
3fcfa129 | 360 | err = -ENXIO; |
fadf6bf0 TF |
361 | } else { |
362 | while (t->prl) { | |
363 | x = t->prl; | |
364 | t->prl = t->prl->next; | |
365 | kfree(x); | |
300aaeea | 366 | t->prl_count--; |
fadf6bf0 TF |
367 | } |
368 | } | |
3fcfa129 YH |
369 | out: |
370 | write_unlock(&ipip6_lock); | |
4b279601 | 371 | return err; |
fadf6bf0 TF |
372 | } |
373 | ||
fadf6bf0 TF |
374 | static int |
375 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
376 | { | |
3fcfa129 | 377 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
378 | int ok = 1; |
379 | ||
3fcfa129 YH |
380 | read_lock(&ipip6_lock); |
381 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 382 | if (p) { |
300aaeea | 383 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
384 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
385 | else | |
386 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
387 | } else { | |
388 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
389 | if (ipv6_addr_is_isatap(addr6) && | |
390 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 391 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
392 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
393 | else | |
394 | ok = 0; | |
395 | } | |
3fcfa129 | 396 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
397 | return ok; |
398 | } | |
399 | ||
1da177e4 LT |
400 | static void ipip6_tunnel_uninit(struct net_device *dev) |
401 | { | |
ca8def14 PE |
402 | struct net *net = dev_net(dev); |
403 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
404 | ||
cd3dbc19 | 405 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 | 406 | write_lock_bh(&ipip6_lock); |
29182176 | 407 | sitn->tunnels_wc[0] = NULL; |
1da177e4 LT |
408 | write_unlock_bh(&ipip6_lock); |
409 | dev_put(dev); | |
410 | } else { | |
ca8def14 | 411 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 412 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
413 | dev_put(dev); |
414 | } | |
415 | } | |
416 | ||
417 | ||
c73cb5a2 | 418 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 419 | { |
1da177e4 | 420 | |
071f92d0 | 421 | /* All the routers (except for Linux) return only |
1da177e4 LT |
422 | 8 bytes of packet payload. It means, that precise relaying of |
423 | ICMP in the real Internet is absolutely infeasible. | |
424 | */ | |
425 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
426 | const int type = icmp_hdr(skb)->type; |
427 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 428 | struct ip_tunnel *t; |
c73cb5a2 | 429 | int err; |
1da177e4 LT |
430 | |
431 | switch (type) { | |
432 | default: | |
433 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 434 | return 0; |
1da177e4 LT |
435 | |
436 | case ICMP_DEST_UNREACH: | |
437 | switch (code) { | |
438 | case ICMP_SR_FAILED: | |
439 | case ICMP_PORT_UNREACH: | |
440 | /* Impossible event. */ | |
c73cb5a2 | 441 | return 0; |
1da177e4 LT |
442 | case ICMP_FRAG_NEEDED: |
443 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 444 | return 0; |
1da177e4 LT |
445 | default: |
446 | /* All others are translated to HOST_UNREACH. | |
447 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
448 | I believe they are just ether pollution. --ANK | |
449 | */ | |
450 | break; | |
451 | } | |
452 | break; | |
453 | case ICMP_TIME_EXCEEDED: | |
454 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 455 | return 0; |
1da177e4 LT |
456 | break; |
457 | } | |
458 | ||
c73cb5a2 KM |
459 | err = -ENOENT; |
460 | ||
1da177e4 | 461 | read_lock(&ipip6_lock); |
4fddbf5d SH |
462 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
463 | skb->dev, | |
464 | iph->daddr, | |
465 | iph->saddr); | |
1da177e4 LT |
466 | if (t == NULL || t->parms.iph.daddr == 0) |
467 | goto out; | |
c73cb5a2 KM |
468 | |
469 | err = 0; | |
1da177e4 LT |
470 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
471 | goto out; | |
472 | ||
bb80087a | 473 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
474 | t->err_count++; |
475 | else | |
476 | t->err_count = 1; | |
477 | t->err_time = jiffies; | |
478 | out: | |
479 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 480 | return err; |
1da177e4 LT |
481 | } |
482 | ||
483 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
484 | { | |
485 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 486 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
487 | } |
488 | ||
489 | static int ipip6_rcv(struct sk_buff *skb) | |
490 | { | |
491 | struct iphdr *iph; | |
492 | struct ip_tunnel *tunnel; | |
493 | ||
494 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
495 | goto out; | |
496 | ||
eddc9ec5 | 497 | iph = ip_hdr(skb); |
1da177e4 LT |
498 | |
499 | read_lock(&ipip6_lock); | |
4fddbf5d SH |
500 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
501 | iph->saddr, iph->daddr); | |
502 | if (tunnel != NULL) { | |
1da177e4 | 503 | secpath_reset(skb); |
b0e380b1 | 504 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 505 | skb_reset_network_header(skb); |
8cdfab8a | 506 | IPCB(skb)->flags = 0; |
1da177e4 LT |
507 | skb->protocol = htons(ETH_P_IPV6); |
508 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
509 | |
510 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 511 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 512 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
513 | read_unlock(&ipip6_lock); |
514 | kfree_skb(skb); | |
515 | return 0; | |
516 | } | |
4eecc107 PE |
517 | tunnel->dev->stats.rx_packets++; |
518 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
519 | skb->dev = tunnel->dev; |
520 | dst_release(skb->dst); | |
521 | skb->dst = NULL; | |
522 | nf_reset(skb); | |
523 | ipip6_ecn_decapsulate(iph, skb); | |
524 | netif_rx(skb); | |
525 | read_unlock(&ipip6_lock); | |
526 | return 0; | |
527 | } | |
528 | ||
45af08be | 529 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
530 | read_unlock(&ipip6_lock); |
531 | out: | |
36ca34cc | 532 | kfree_skb(skb); |
1da177e4 LT |
533 | return 0; |
534 | } | |
535 | ||
536 | /* Returns the embedded IPv4 address if the IPv6 address | |
537 | comes from 6to4 (RFC 3056) addr space */ | |
538 | ||
e69a4adc | 539 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 540 | { |
e69a4adc | 541 | __be32 dst = 0; |
1da177e4 LT |
542 | |
543 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 544 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
545 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
546 | } | |
547 | return dst; | |
548 | } | |
549 | ||
550 | /* | |
551 | * This function assumes it is being called from dev_queue_xmit() | |
552 | * and that skb is filled properly by that function. | |
553 | */ | |
554 | ||
555 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
556 | { | |
2941a486 | 557 | struct ip_tunnel *tunnel = netdev_priv(dev); |
4eecc107 | 558 | struct net_device_stats *stats = &tunnel->dev->stats; |
1da177e4 | 559 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 560 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
561 | u8 tos = tunnel->parms.iph.tos; |
562 | struct rtable *rt; /* Route to the other host */ | |
563 | struct net_device *tdev; /* Device to other host */ | |
564 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 565 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 566 | __be32 dst = tiph->daddr; |
1da177e4 | 567 | int mtu; |
1ab1457c | 568 | struct in6_addr *addr6; |
1da177e4 LT |
569 | int addr_type; |
570 | ||
571 | if (tunnel->recursion++) { | |
4eecc107 | 572 | stats->collisions++; |
1da177e4 LT |
573 | goto tx_error; |
574 | } | |
575 | ||
576 | if (skb->protocol != htons(ETH_P_IPV6)) | |
577 | goto tx_error; | |
578 | ||
c7dc89c0 FT |
579 | /* ISATAP (RFC4214) - must come before 6to4 */ |
580 | if (dev->priv_flags & IFF_ISATAP) { | |
581 | struct neighbour *neigh = NULL; | |
582 | ||
583 | if (skb->dst) | |
584 | neigh = skb->dst->neighbour; | |
585 | ||
586 | if (neigh == NULL) { | |
587 | if (net_ratelimit()) | |
588 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
589 | goto tx_error; | |
590 | } | |
591 | ||
592 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
593 | addr_type = ipv6_addr_type(addr6); | |
594 | ||
595 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
596 | ipv6_addr_is_isatap(addr6)) | |
597 | dst = addr6->s6_addr32[3]; | |
598 | else | |
599 | goto tx_error; | |
600 | } | |
601 | ||
1da177e4 LT |
602 | if (!dst) |
603 | dst = try_6to4(&iph6->daddr); | |
604 | ||
605 | if (!dst) { | |
606 | struct neighbour *neigh = NULL; | |
607 | ||
608 | if (skb->dst) | |
609 | neigh = skb->dst->neighbour; | |
610 | ||
611 | if (neigh == NULL) { | |
612 | if (net_ratelimit()) | |
613 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
614 | goto tx_error; | |
615 | } | |
616 | ||
617 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
618 | addr_type = ipv6_addr_type(addr6); | |
619 | ||
620 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 621 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
622 | addr_type = ipv6_addr_type(addr6); |
623 | } | |
624 | ||
625 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
626 | goto tx_error_icmp; | |
627 | ||
628 | dst = addr6->s6_addr32[3]; | |
629 | } | |
630 | ||
631 | { | |
632 | struct flowi fl = { .nl_u = { .ip4_u = | |
633 | { .daddr = dst, | |
634 | .saddr = tiph->saddr, | |
635 | .tos = RT_TOS(tos) } }, | |
636 | .oif = tunnel->parms.link, | |
637 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 638 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 639 | stats->tx_carrier_errors++; |
1da177e4 LT |
640 | goto tx_error_icmp; |
641 | } | |
642 | } | |
643 | if (rt->rt_type != RTN_UNICAST) { | |
644 | ip_rt_put(rt); | |
4eecc107 | 645 | stats->tx_carrier_errors++; |
1da177e4 LT |
646 | goto tx_error_icmp; |
647 | } | |
648 | tdev = rt->u.dst.dev; | |
649 | ||
650 | if (tdev == dev) { | |
651 | ip_rt_put(rt); | |
4eecc107 | 652 | stats->collisions++; |
1da177e4 LT |
653 | goto tx_error; |
654 | } | |
655 | ||
656 | if (tiph->frag_off) | |
657 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
658 | else | |
659 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
660 | ||
661 | if (mtu < 68) { | |
4eecc107 | 662 | stats->collisions++; |
1da177e4 LT |
663 | ip_rt_put(rt); |
664 | goto tx_error; | |
665 | } | |
666 | if (mtu < IPV6_MIN_MTU) | |
667 | mtu = IPV6_MIN_MTU; | |
668 | if (tunnel->parms.iph.daddr && skb->dst) | |
669 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
670 | ||
671 | if (skb->len > mtu) { | |
672 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
673 | ip_rt_put(rt); | |
674 | goto tx_error; | |
675 | } | |
676 | ||
677 | if (tunnel->err_count > 0) { | |
bb80087a WY |
678 | if (time_before(jiffies, |
679 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
680 | tunnel->err_count--; |
681 | dst_link_failure(skb); | |
682 | } else | |
683 | tunnel->err_count = 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Okay, now see if we can stuff it in the buffer as-is. | |
688 | */ | |
689 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
690 | ||
cfbba49d PM |
691 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
692 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
693 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
694 | if (!new_skb) { | |
695 | ip_rt_put(rt); | |
1ab1457c | 696 | stats->tx_dropped++; |
1da177e4 LT |
697 | dev_kfree_skb(skb); |
698 | tunnel->recursion--; | |
699 | return 0; | |
700 | } | |
701 | if (skb->sk) | |
702 | skb_set_owner_w(new_skb, skb->sk); | |
703 | dev_kfree_skb(skb); | |
704 | skb = new_skb; | |
0660e03f | 705 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
706 | } |
707 | ||
b0e380b1 | 708 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
709 | skb_push(skb, sizeof(struct iphdr)); |
710 | skb_reset_network_header(skb); | |
1da177e4 | 711 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 712 | IPCB(skb)->flags = 0; |
1da177e4 LT |
713 | dst_release(skb->dst); |
714 | skb->dst = &rt->u.dst; | |
715 | ||
716 | /* | |
717 | * Push down and install the IPIP header. | |
718 | */ | |
719 | ||
eddc9ec5 | 720 | iph = ip_hdr(skb); |
1da177e4 LT |
721 | iph->version = 4; |
722 | iph->ihl = sizeof(struct iphdr)>>2; | |
723 | if (mtu > IPV6_MIN_MTU) | |
724 | iph->frag_off = htons(IP_DF); | |
725 | else | |
726 | iph->frag_off = 0; | |
727 | ||
728 | iph->protocol = IPPROTO_IPV6; | |
729 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
730 | iph->daddr = rt->rt_dst; | |
731 | iph->saddr = rt->rt_src; | |
732 | ||
733 | if ((iph->ttl = tiph->ttl) == 0) | |
734 | iph->ttl = iph6->hop_limit; | |
735 | ||
736 | nf_reset(skb); | |
737 | ||
738 | IPTUNNEL_XMIT(); | |
739 | tunnel->recursion--; | |
740 | return 0; | |
741 | ||
742 | tx_error_icmp: | |
743 | dst_link_failure(skb); | |
744 | tx_error: | |
745 | stats->tx_errors++; | |
746 | dev_kfree_skb(skb); | |
747 | tunnel->recursion--; | |
748 | return 0; | |
749 | } | |
750 | ||
8a4a50f9 MS |
751 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
752 | { | |
753 | struct net_device *tdev = NULL; | |
754 | struct ip_tunnel *tunnel; | |
755 | struct iphdr *iph; | |
756 | ||
757 | tunnel = netdev_priv(dev); | |
758 | iph = &tunnel->parms.iph; | |
759 | ||
760 | if (iph->daddr) { | |
761 | struct flowi fl = { .nl_u = { .ip4_u = | |
762 | { .daddr = iph->daddr, | |
763 | .saddr = iph->saddr, | |
764 | .tos = RT_TOS(iph->tos) } }, | |
765 | .oif = tunnel->parms.link, | |
766 | .proto = IPPROTO_IPV6 }; | |
767 | struct rtable *rt; | |
907a08c4 | 768 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
769 | tdev = rt->u.dst.dev; |
770 | ip_rt_put(rt); | |
771 | } | |
772 | dev->flags |= IFF_POINTOPOINT; | |
773 | } | |
774 | ||
775 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 776 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
777 | |
778 | if (tdev) { | |
779 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
780 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
781 | if (dev->mtu < IPV6_MIN_MTU) | |
782 | dev->mtu = IPV6_MIN_MTU; | |
783 | } | |
784 | dev->iflink = tunnel->parms.link; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | static int |
788 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
789 | { | |
790 | int err = 0; | |
791 | struct ip_tunnel_parm p; | |
fadf6bf0 | 792 | struct ip_tunnel_prl prl; |
1da177e4 | 793 | struct ip_tunnel *t; |
ca8def14 PE |
794 | struct net *net = dev_net(dev); |
795 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
796 | |
797 | switch (cmd) { | |
798 | case SIOCGETTUNNEL: | |
799 | t = NULL; | |
cd3dbc19 | 800 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
801 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
802 | err = -EFAULT; | |
803 | break; | |
804 | } | |
ca8def14 | 805 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
806 | } |
807 | if (t == NULL) | |
2941a486 | 808 | t = netdev_priv(dev); |
1da177e4 LT |
809 | memcpy(&p, &t->parms, sizeof(p)); |
810 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
811 | err = -EFAULT; | |
812 | break; | |
813 | ||
814 | case SIOCADDTUNNEL: | |
815 | case SIOCCHGTUNNEL: | |
816 | err = -EPERM; | |
817 | if (!capable(CAP_NET_ADMIN)) | |
818 | goto done; | |
819 | ||
820 | err = -EFAULT; | |
821 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
822 | goto done; | |
823 | ||
824 | err = -EINVAL; | |
825 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
826 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
827 | goto done; | |
828 | if (p.iph.ttl) | |
829 | p.iph.frag_off |= htons(IP_DF); | |
830 | ||
ca8def14 | 831 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 832 | |
cd3dbc19 | 833 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
834 | if (t != NULL) { |
835 | if (t->dev != dev) { | |
836 | err = -EEXIST; | |
837 | break; | |
838 | } | |
839 | } else { | |
840 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
841 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
842 | err = -EINVAL; | |
843 | break; | |
844 | } | |
2941a486 | 845 | t = netdev_priv(dev); |
ca8def14 | 846 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
847 | t->parms.iph.saddr = p.iph.saddr; |
848 | t->parms.iph.daddr = p.iph.daddr; | |
849 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
850 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 851 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
852 | netdev_state_change(dev); |
853 | } | |
854 | } | |
855 | ||
856 | if (t) { | |
857 | err = 0; | |
858 | if (cmd == SIOCCHGTUNNEL) { | |
859 | t->parms.iph.ttl = p.iph.ttl; | |
860 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
861 | if (t->parms.link != p.link) { |
862 | t->parms.link = p.link; | |
863 | ipip6_tunnel_bind_dev(dev); | |
864 | netdev_state_change(dev); | |
865 | } | |
1da177e4 LT |
866 | } |
867 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
868 | err = -EFAULT; | |
869 | } else | |
870 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
871 | break; | |
872 | ||
873 | case SIOCDELTUNNEL: | |
874 | err = -EPERM; | |
875 | if (!capable(CAP_NET_ADMIN)) | |
876 | goto done; | |
877 | ||
cd3dbc19 | 878 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
879 | err = -EFAULT; |
880 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
881 | goto done; | |
882 | err = -ENOENT; | |
ca8def14 | 883 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
884 | goto done; |
885 | err = -EPERM; | |
cd3dbc19 | 886 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
887 | goto done; |
888 | dev = t->dev; | |
889 | } | |
22f8cde5 SH |
890 | unregister_netdevice(dev); |
891 | err = 0; | |
1da177e4 LT |
892 | break; |
893 | ||
300aaeea | 894 | case SIOCGETPRL: |
2b4743bd YH |
895 | err = -EINVAL; |
896 | if (dev == sitn->fb_tunnel_dev) | |
897 | goto done; | |
898 | err = -ENOENT; | |
899 | if (!(t = netdev_priv(dev))) | |
900 | goto done; | |
901 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
902 | break; | |
903 | ||
fadf6bf0 TF |
904 | case SIOCADDPRL: |
905 | case SIOCDELPRL: | |
906 | case SIOCCHGPRL: | |
907 | err = -EPERM; | |
2b4743bd | 908 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
909 | goto done; |
910 | err = -EINVAL; | |
cd3dbc19 | 911 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
912 | goto done; |
913 | err = -EFAULT; | |
914 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
915 | goto done; | |
916 | err = -ENOENT; | |
917 | if (!(t = netdev_priv(dev))) | |
918 | goto done; | |
919 | ||
300aaeea | 920 | switch (cmd) { |
300aaeea | 921 | case SIOCDELPRL: |
fadf6bf0 | 922 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
923 | break; |
924 | case SIOCADDPRL: | |
925 | case SIOCCHGPRL: | |
fadf6bf0 | 926 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
927 | break; |
928 | } | |
2b4743bd | 929 | netdev_state_change(dev); |
fadf6bf0 TF |
930 | break; |
931 | ||
1da177e4 LT |
932 | default: |
933 | err = -EINVAL; | |
934 | } | |
935 | ||
936 | done: | |
937 | return err; | |
938 | } | |
939 | ||
1da177e4 LT |
940 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
941 | { | |
942 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
943 | return -EINVAL; | |
944 | dev->mtu = new_mtu; | |
945 | return 0; | |
946 | } | |
947 | ||
1326c3d5 SH |
948 | static const struct net_device_ops ipip6_netdev_ops = { |
949 | .ndo_uninit = ipip6_tunnel_uninit, | |
950 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
951 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
952 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
953 | }; | |
954 | ||
1da177e4 LT |
955 | static void ipip6_tunnel_setup(struct net_device *dev) |
956 | { | |
1326c3d5 | 957 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 958 | dev->destructor = free_netdev; |
1da177e4 LT |
959 | |
960 | dev->type = ARPHRD_SIT; | |
961 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 962 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
963 | dev->flags = IFF_NOARP; |
964 | dev->iflink = 0; | |
965 | dev->addr_len = 4; | |
7a97146c | 966 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
967 | } |
968 | ||
1326c3d5 | 969 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 970 | { |
1326c3d5 | 971 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
972 | |
973 | tunnel->dev = dev; | |
974 | strcpy(tunnel->parms.name, dev->name); | |
975 | ||
976 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
977 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
978 | ||
8a4a50f9 | 979 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
980 | } |
981 | ||
1326c3d5 | 982 | static void ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 983 | { |
2941a486 | 984 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 985 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
986 | struct net *net = dev_net(dev); |
987 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
988 | |
989 | tunnel->dev = dev; | |
990 | strcpy(tunnel->parms.name, dev->name); | |
991 | ||
992 | iph->version = 4; | |
993 | iph->protocol = IPPROTO_IPV6; | |
994 | iph->ihl = 5; | |
995 | iph->ttl = 64; | |
996 | ||
997 | dev_hold(dev); | |
29182176 | 998 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
999 | } |
1000 | ||
c73cb5a2 | 1001 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1002 | .handler = ipip6_rcv, |
1003 | .err_handler = ipip6_err, | |
c73cb5a2 | 1004 | .priority = 1, |
1da177e4 LT |
1005 | }; |
1006 | ||
29182176 | 1007 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
1008 | { |
1009 | int prio; | |
1010 | ||
1011 | for (prio = 1; prio < 4; prio++) { | |
1012 | int h; | |
1013 | for (h = 0; h < HASH_SIZE; h++) { | |
1014 | struct ip_tunnel *t; | |
29182176 | 1015 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1016 | unregister_netdevice(t->dev); |
1017 | } | |
1018 | } | |
1019 | } | |
1020 | ||
8190d900 PE |
1021 | static int sit_init_net(struct net *net) |
1022 | { | |
1023 | int err; | |
1024 | struct sit_net *sitn; | |
1025 | ||
1026 | err = -ENOMEM; | |
29182176 | 1027 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1028 | if (sitn == NULL) |
1029 | goto err_alloc; | |
1030 | ||
1031 | err = net_assign_generic(net, sit_net_id, sitn); | |
1032 | if (err < 0) | |
1033 | goto err_assign; | |
1034 | ||
29182176 PE |
1035 | sitn->tunnels[0] = sitn->tunnels_wc; |
1036 | sitn->tunnels[1] = sitn->tunnels_l; | |
1037 | sitn->tunnels[2] = sitn->tunnels_r; | |
1038 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1039 | ||
cd3dbc19 PE |
1040 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1041 | ipip6_tunnel_setup); | |
1042 | if (!sitn->fb_tunnel_dev) { | |
1043 | err = -ENOMEM; | |
1044 | goto err_alloc_dev; | |
1045 | } | |
be77e593 | 1046 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1047 | |
1326c3d5 | 1048 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1049 | |
1050 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1051 | goto err_reg_dev; | |
1052 | ||
8190d900 PE |
1053 | return 0; |
1054 | ||
cd3dbc19 | 1055 | err_reg_dev: |
1326c3d5 | 1056 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1057 | free_netdev(sitn->fb_tunnel_dev); |
1058 | err_alloc_dev: | |
1059 | /* nothing */ | |
8190d900 PE |
1060 | err_assign: |
1061 | kfree(sitn); | |
1062 | err_alloc: | |
1063 | return err; | |
1064 | } | |
1065 | ||
1066 | static void sit_exit_net(struct net *net) | |
1067 | { | |
1068 | struct sit_net *sitn; | |
1069 | ||
1070 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1071 | rtnl_lock(); |
29182176 | 1072 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1073 | unregister_netdevice(sitn->fb_tunnel_dev); |
1074 | rtnl_unlock(); | |
8190d900 PE |
1075 | kfree(sitn); |
1076 | } | |
1077 | ||
1078 | static struct pernet_operations sit_net_ops = { | |
1079 | .init = sit_init_net, | |
1080 | .exit = sit_exit_net, | |
1081 | }; | |
1082 | ||
89c89458 | 1083 | static void __exit sit_cleanup(void) |
1da177e4 | 1084 | { |
c73cb5a2 | 1085 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1086 | |
8190d900 | 1087 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1088 | } |
1089 | ||
89c89458 | 1090 | static int __init sit_init(void) |
1da177e4 LT |
1091 | { |
1092 | int err; | |
1093 | ||
1094 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1095 | ||
c73cb5a2 | 1096 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1097 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1098 | return -EAGAIN; | |
1099 | } | |
1100 | ||
8190d900 PE |
1101 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1102 | if (err < 0) | |
cd3dbc19 | 1103 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1104 | |
1da177e4 | 1105 | return err; |
1da177e4 | 1106 | } |
989e5b96 JR |
1107 | |
1108 | module_init(sit_init); | |
1109 | module_exit(sit_cleanup); | |
39c85086 | 1110 | MODULE_LICENSE("GPL"); |
daccff02 | 1111 | MODULE_ALIAS("sit0"); |