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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 | 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 | ||
fa857afc YH |
164 | static void ipip6_tunnel_clone_6rd(struct ip_tunnel *t, struct sit_net *sitn) |
165 | { | |
166 | #ifdef CONFIG_IPV6_SIT_6RD | |
167 | if (t->dev == sitn->fb_tunnel_dev) { | |
168 | ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); | |
169 | t->ip6rd.relay_prefix = 0; | |
170 | t->ip6rd.prefixlen = 16; | |
171 | t->ip6rd.relay_prefixlen = 0; | |
172 | } else { | |
173 | struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); | |
174 | memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); | |
175 | } | |
176 | #endif | |
177 | } | |
178 | ||
ca8def14 PE |
179 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
180 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 181 | { |
e69a4adc AV |
182 | __be32 remote = parms->iph.daddr; |
183 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
184 | struct ip_tunnel *t, **tp, *nt; |
185 | struct net_device *dev; | |
1da177e4 | 186 | char name[IFNAMSIZ]; |
ca8def14 | 187 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 188 | |
ca8def14 | 189 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
8db99e57 | 190 | if (local == t->parms.iph.saddr && |
4fddbf5d SH |
191 | remote == t->parms.iph.daddr && |
192 | parms->link == t->parms.link) { | |
8db99e57 SH |
193 | if (create) |
194 | return NULL; | |
195 | else | |
196 | return t; | |
197 | } | |
1da177e4 LT |
198 | } |
199 | if (!create) | |
200 | goto failed; | |
201 | ||
202 | if (parms->name[0]) | |
203 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
204 | else |
205 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
206 | |
207 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
208 | if (dev == NULL) | |
209 | return NULL; | |
210 | ||
7a97146c PE |
211 | dev_net_set(dev, net); |
212 | ||
b37d428b PE |
213 | if (strchr(name, '%')) { |
214 | if (dev_alloc_name(dev, name) < 0) | |
215 | goto failed_free; | |
216 | } | |
217 | ||
2941a486 | 218 | nt = netdev_priv(dev); |
1326c3d5 | 219 | |
1da177e4 | 220 | nt->parms = *parms; |
1b1d8f73 | 221 | ipip6_tunnel_init(dev); |
1da177e4 | 222 | |
c7dc89c0 FT |
223 | if (parms->i_flags & SIT_ISATAP) |
224 | dev->priv_flags |= IFF_ISATAP; | |
225 | ||
b37d428b PE |
226 | if (register_netdevice(dev) < 0) |
227 | goto failed_free; | |
1da177e4 LT |
228 | |
229 | dev_hold(dev); | |
230 | ||
fa857afc YH |
231 | ipip6_tunnel_clone_6rd(t, sitn); |
232 | ||
ca8def14 | 233 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
234 | return nt; |
235 | ||
b37d428b PE |
236 | failed_free: |
237 | free_netdev(dev); | |
1da177e4 LT |
238 | failed: |
239 | return NULL; | |
240 | } | |
241 | ||
fadf6bf0 | 242 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 243 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
244 | { |
245 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
246 | ||
247 | for (p = t->prl; p; p = p->next) | |
300aaeea | 248 | if (p->addr == addr) |
fadf6bf0 TF |
249 | break; |
250 | return p; | |
251 | ||
252 | } | |
253 | ||
2b4743bd YH |
254 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, |
255 | struct ip_tunnel_prl __user *a) | |
300aaeea | 256 | { |
2b4743bd | 257 | struct ip_tunnel_prl kprl, *kp; |
300aaeea YH |
258 | struct ip_tunnel_prl_entry *prl; |
259 | unsigned int cmax, c = 0, ca, len; | |
260 | int ret = 0; | |
261 | ||
2b4743bd YH |
262 | if (copy_from_user(&kprl, a, sizeof(kprl))) |
263 | return -EFAULT; | |
264 | cmax = kprl.datalen / sizeof(kprl); | |
265 | if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) | |
300aaeea YH |
266 | cmax = 1; |
267 | ||
268 | /* For simple GET or for root users, | |
269 | * we try harder to allocate. | |
270 | */ | |
271 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
272 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
273 | NULL; | |
274 | ||
275 | read_lock(&ipip6_lock); | |
276 | ||
277 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
278 | ||
279 | if (!kp) { | |
280 | /* We don't try hard to allocate much memory for | |
281 | * non-root users. | |
282 | * For root users, retry allocating enough memory for | |
283 | * the answer. | |
284 | */ | |
285 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
286 | if (!kp) { | |
287 | ret = -ENOMEM; | |
288 | goto out; | |
289 | } | |
290 | } | |
291 | ||
292 | c = 0; | |
293 | for (prl = t->prl; prl; prl = prl->next) { | |
298bf12d | 294 | if (c >= cmax) |
300aaeea | 295 | break; |
2b4743bd | 296 | if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) |
300aaeea YH |
297 | continue; |
298 | kp[c].addr = prl->addr; | |
299 | kp[c].flags = prl->flags; | |
300 | c++; | |
2b4743bd | 301 | if (kprl.addr != htonl(INADDR_ANY)) |
300aaeea YH |
302 | break; |
303 | } | |
304 | out: | |
305 | read_unlock(&ipip6_lock); | |
306 | ||
307 | len = sizeof(*kp) * c; | |
2b4743bd YH |
308 | ret = 0; |
309 | if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) | |
310 | ret = -EFAULT; | |
300aaeea YH |
311 | |
312 | kfree(kp); | |
300aaeea | 313 | |
2b4743bd | 314 | return ret; |
300aaeea YH |
315 | } |
316 | ||
fadf6bf0 TF |
317 | static int |
318 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
319 | { | |
320 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
321 | int err = 0; |
322 | ||
0009ae1f YH |
323 | if (a->addr == htonl(INADDR_ANY)) |
324 | return -EINVAL; | |
325 | ||
3fcfa129 | 326 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
327 | |
328 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 329 | if (p->addr == a->addr) { |
3fcfa129 YH |
330 | if (chg) |
331 | goto update; | |
332 | err = -EEXIST; | |
333 | goto out; | |
fadf6bf0 TF |
334 | } |
335 | } | |
336 | ||
3fcfa129 YH |
337 | if (chg) { |
338 | err = -ENXIO; | |
339 | goto out; | |
340 | } | |
fadf6bf0 TF |
341 | |
342 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
343 | if (!p) { |
344 | err = -ENOBUFS; | |
345 | goto out; | |
346 | } | |
fadf6bf0 | 347 | |
fadf6bf0 TF |
348 | p->next = t->prl; |
349 | t->prl = p; | |
300aaeea | 350 | t->prl_count++; |
3fcfa129 | 351 | update: |
300aaeea YH |
352 | p->addr = a->addr; |
353 | p->flags = a->flags; | |
3fcfa129 YH |
354 | out: |
355 | write_unlock(&ipip6_lock); | |
356 | return err; | |
fadf6bf0 TF |
357 | } |
358 | ||
359 | static int | |
360 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
361 | { | |
362 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
363 | int err = 0; |
364 | ||
365 | write_lock(&ipip6_lock); | |
fadf6bf0 | 366 | |
0009ae1f | 367 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 368 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 369 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
370 | x = *p; |
371 | *p = x->next; | |
372 | kfree(x); | |
300aaeea | 373 | t->prl_count--; |
3fcfa129 | 374 | goto out; |
fadf6bf0 TF |
375 | } |
376 | } | |
3fcfa129 | 377 | err = -ENXIO; |
fadf6bf0 TF |
378 | } else { |
379 | while (t->prl) { | |
380 | x = t->prl; | |
381 | t->prl = t->prl->next; | |
382 | kfree(x); | |
300aaeea | 383 | t->prl_count--; |
fadf6bf0 TF |
384 | } |
385 | } | |
3fcfa129 YH |
386 | out: |
387 | write_unlock(&ipip6_lock); | |
4b279601 | 388 | return err; |
fadf6bf0 TF |
389 | } |
390 | ||
fadf6bf0 TF |
391 | static int |
392 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
393 | { | |
3fcfa129 | 394 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
395 | int ok = 1; |
396 | ||
3fcfa129 YH |
397 | read_lock(&ipip6_lock); |
398 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 399 | if (p) { |
300aaeea | 400 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
401 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
402 | else | |
403 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
404 | } else { | |
405 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
406 | if (ipv6_addr_is_isatap(addr6) && | |
407 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 408 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
409 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
410 | else | |
411 | ok = 0; | |
412 | } | |
3fcfa129 | 413 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
414 | return ok; |
415 | } | |
416 | ||
1da177e4 LT |
417 | static void ipip6_tunnel_uninit(struct net_device *dev) |
418 | { | |
ca8def14 PE |
419 | struct net *net = dev_net(dev); |
420 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
421 | ||
cd3dbc19 | 422 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 | 423 | write_lock_bh(&ipip6_lock); |
29182176 | 424 | sitn->tunnels_wc[0] = NULL; |
1da177e4 LT |
425 | write_unlock_bh(&ipip6_lock); |
426 | dev_put(dev); | |
427 | } else { | |
ca8def14 | 428 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 429 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
430 | dev_put(dev); |
431 | } | |
432 | } | |
433 | ||
434 | ||
c73cb5a2 | 435 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 | 436 | { |
1da177e4 | 437 | |
071f92d0 | 438 | /* All the routers (except for Linux) return only |
1da177e4 LT |
439 | 8 bytes of packet payload. It means, that precise relaying of |
440 | ICMP in the real Internet is absolutely infeasible. | |
441 | */ | |
442 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
443 | const int type = icmp_hdr(skb)->type; |
444 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 445 | struct ip_tunnel *t; |
c73cb5a2 | 446 | int err; |
1da177e4 LT |
447 | |
448 | switch (type) { | |
449 | default: | |
450 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 451 | return 0; |
1da177e4 LT |
452 | |
453 | case ICMP_DEST_UNREACH: | |
454 | switch (code) { | |
455 | case ICMP_SR_FAILED: | |
456 | case ICMP_PORT_UNREACH: | |
457 | /* Impossible event. */ | |
c73cb5a2 | 458 | return 0; |
1da177e4 LT |
459 | case ICMP_FRAG_NEEDED: |
460 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 461 | return 0; |
1da177e4 LT |
462 | default: |
463 | /* All others are translated to HOST_UNREACH. | |
464 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
465 | I believe they are just ether pollution. --ANK | |
466 | */ | |
467 | break; | |
468 | } | |
469 | break; | |
470 | case ICMP_TIME_EXCEEDED: | |
471 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 472 | return 0; |
1da177e4 LT |
473 | break; |
474 | } | |
475 | ||
c73cb5a2 KM |
476 | err = -ENOENT; |
477 | ||
1da177e4 | 478 | read_lock(&ipip6_lock); |
4fddbf5d SH |
479 | t = ipip6_tunnel_lookup(dev_net(skb->dev), |
480 | skb->dev, | |
481 | iph->daddr, | |
482 | iph->saddr); | |
1da177e4 LT |
483 | if (t == NULL || t->parms.iph.daddr == 0) |
484 | goto out; | |
c73cb5a2 KM |
485 | |
486 | err = 0; | |
1da177e4 LT |
487 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
488 | goto out; | |
489 | ||
bb80087a | 490 | if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) |
1da177e4 LT |
491 | t->err_count++; |
492 | else | |
493 | t->err_count = 1; | |
494 | t->err_time = jiffies; | |
495 | out: | |
496 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 497 | return err; |
1da177e4 LT |
498 | } |
499 | ||
500 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
501 | { | |
502 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 503 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
504 | } |
505 | ||
506 | static int ipip6_rcv(struct sk_buff *skb) | |
507 | { | |
508 | struct iphdr *iph; | |
509 | struct ip_tunnel *tunnel; | |
510 | ||
511 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
512 | goto out; | |
513 | ||
eddc9ec5 | 514 | iph = ip_hdr(skb); |
1da177e4 LT |
515 | |
516 | read_lock(&ipip6_lock); | |
4fddbf5d SH |
517 | tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, |
518 | iph->saddr, iph->daddr); | |
519 | if (tunnel != NULL) { | |
1da177e4 | 520 | secpath_reset(skb); |
b0e380b1 | 521 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 522 | skb_reset_network_header(skb); |
8cdfab8a | 523 | IPCB(skb)->flags = 0; |
1da177e4 LT |
524 | skb->protocol = htons(ETH_P_IPV6); |
525 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
526 | |
527 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 528 | !isatap_chksrc(skb, iph, tunnel)) { |
4eecc107 | 529 | tunnel->dev->stats.rx_errors++; |
c7dc89c0 FT |
530 | read_unlock(&ipip6_lock); |
531 | kfree_skb(skb); | |
532 | return 0; | |
533 | } | |
4eecc107 PE |
534 | tunnel->dev->stats.rx_packets++; |
535 | tunnel->dev->stats.rx_bytes += skb->len; | |
1da177e4 | 536 | skb->dev = tunnel->dev; |
adf30907 | 537 | skb_dst_drop(skb); |
1da177e4 LT |
538 | nf_reset(skb); |
539 | ipip6_ecn_decapsulate(iph, skb); | |
540 | netif_rx(skb); | |
541 | read_unlock(&ipip6_lock); | |
542 | return 0; | |
543 | } | |
544 | ||
45af08be | 545 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
546 | read_unlock(&ipip6_lock); |
547 | out: | |
36ca34cc | 548 | kfree_skb(skb); |
1da177e4 LT |
549 | return 0; |
550 | } | |
551 | ||
fa857afc YH |
552 | /* |
553 | * Returns the embedded IPv4 address if the IPv6 address | |
554 | * comes from 6rd / 6to4 (RFC 3056) addr space. | |
555 | */ | |
556 | static inline | |
557 | __be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel) | |
1da177e4 | 558 | { |
e69a4adc | 559 | __be32 dst = 0; |
1da177e4 | 560 | |
fa857afc YH |
561 | #ifdef CONFIG_IPV6_SIT_6RD |
562 | if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, | |
563 | tunnel->ip6rd.prefixlen)) { | |
564 | unsigned pbw0, pbi0; | |
565 | int pbi1; | |
566 | u32 d; | |
567 | ||
568 | pbw0 = tunnel->ip6rd.prefixlen >> 5; | |
569 | pbi0 = tunnel->ip6rd.prefixlen & 0x1f; | |
570 | ||
571 | d = (ntohl(tunnel->ip6rd.prefix.s6_addr32[pbw0]) << pbi0) >> | |
572 | tunnel->ip6rd.relay_prefixlen; | |
573 | ||
574 | pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; | |
575 | if (pbi1 > 0) | |
576 | d |= ntohl(tunnel->ip6rd.prefix.s6_addr32[pbw0 + 1]) >> | |
577 | (32 - pbi1); | |
578 | ||
579 | dst = tunnel->ip6rd.relay_prefix | htonl(d); | |
580 | } | |
581 | #else | |
1da177e4 | 582 | if (v6dst->s6_addr16[0] == htons(0x2002)) { |
1ab1457c | 583 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
584 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
585 | } | |
fa857afc | 586 | #endif |
1da177e4 LT |
587 | return dst; |
588 | } | |
589 | ||
590 | /* | |
591 | * This function assumes it is being called from dev_queue_xmit() | |
592 | * and that skb is filled properly by that function. | |
593 | */ | |
594 | ||
6fef4c0c SH |
595 | static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, |
596 | struct net_device *dev) | |
1da177e4 | 597 | { |
2941a486 | 598 | struct ip_tunnel *tunnel = netdev_priv(dev); |
0bfbedb1 ED |
599 | struct net_device_stats *stats = &dev->stats; |
600 | struct netdev_queue *txq = netdev_get_tx_queue(dev, 0); | |
1da177e4 | 601 | struct iphdr *tiph = &tunnel->parms.iph; |
0660e03f | 602 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
603 | u8 tos = tunnel->parms.iph.tos; |
604 | struct rtable *rt; /* Route to the other host */ | |
605 | struct net_device *tdev; /* Device to other host */ | |
606 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 607 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 608 | __be32 dst = tiph->daddr; |
1da177e4 | 609 | int mtu; |
1ab1457c | 610 | struct in6_addr *addr6; |
1da177e4 LT |
611 | int addr_type; |
612 | ||
1da177e4 LT |
613 | if (skb->protocol != htons(ETH_P_IPV6)) |
614 | goto tx_error; | |
615 | ||
c7dc89c0 FT |
616 | /* ISATAP (RFC4214) - must come before 6to4 */ |
617 | if (dev->priv_flags & IFF_ISATAP) { | |
618 | struct neighbour *neigh = NULL; | |
619 | ||
adf30907 ED |
620 | if (skb_dst(skb)) |
621 | neigh = skb_dst(skb)->neighbour; | |
c7dc89c0 FT |
622 | |
623 | if (neigh == NULL) { | |
624 | if (net_ratelimit()) | |
625 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
626 | goto tx_error; | |
627 | } | |
628 | ||
629 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
630 | addr_type = ipv6_addr_type(addr6); | |
631 | ||
632 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
633 | ipv6_addr_is_isatap(addr6)) | |
634 | dst = addr6->s6_addr32[3]; | |
635 | else | |
636 | goto tx_error; | |
637 | } | |
638 | ||
1da177e4 | 639 | if (!dst) |
fa857afc | 640 | dst = try_6rd(&iph6->daddr, tunnel); |
1da177e4 LT |
641 | |
642 | if (!dst) { | |
643 | struct neighbour *neigh = NULL; | |
644 | ||
adf30907 ED |
645 | if (skb_dst(skb)) |
646 | neigh = skb_dst(skb)->neighbour; | |
1da177e4 LT |
647 | |
648 | if (neigh == NULL) { | |
649 | if (net_ratelimit()) | |
650 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
651 | goto tx_error; | |
652 | } | |
653 | ||
654 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
655 | addr_type = ipv6_addr_type(addr6); | |
656 | ||
657 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 658 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
659 | addr_type = ipv6_addr_type(addr6); |
660 | } | |
661 | ||
662 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
663 | goto tx_error_icmp; | |
664 | ||
665 | dst = addr6->s6_addr32[3]; | |
666 | } | |
667 | ||
668 | { | |
669 | struct flowi fl = { .nl_u = { .ip4_u = | |
670 | { .daddr = dst, | |
671 | .saddr = tiph->saddr, | |
672 | .tos = RT_TOS(tos) } }, | |
673 | .oif = tunnel->parms.link, | |
674 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 675 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
4eecc107 | 676 | stats->tx_carrier_errors++; |
1da177e4 LT |
677 | goto tx_error_icmp; |
678 | } | |
679 | } | |
680 | if (rt->rt_type != RTN_UNICAST) { | |
681 | ip_rt_put(rt); | |
4eecc107 | 682 | stats->tx_carrier_errors++; |
1da177e4 LT |
683 | goto tx_error_icmp; |
684 | } | |
685 | tdev = rt->u.dst.dev; | |
686 | ||
687 | if (tdev == dev) { | |
688 | ip_rt_put(rt); | |
4eecc107 | 689 | stats->collisions++; |
1da177e4 LT |
690 | goto tx_error; |
691 | } | |
692 | ||
693 | if (tiph->frag_off) | |
694 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
695 | else | |
adf30907 | 696 | mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu; |
1da177e4 LT |
697 | |
698 | if (mtu < 68) { | |
4eecc107 | 699 | stats->collisions++; |
1da177e4 LT |
700 | ip_rt_put(rt); |
701 | goto tx_error; | |
702 | } | |
703 | if (mtu < IPV6_MIN_MTU) | |
704 | mtu = IPV6_MIN_MTU; | |
adf30907 ED |
705 | if (tunnel->parms.iph.daddr && skb_dst(skb)) |
706 | skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); | |
1da177e4 LT |
707 | |
708 | if (skb->len > mtu) { | |
709 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
710 | ip_rt_put(rt); | |
711 | goto tx_error; | |
712 | } | |
713 | ||
714 | if (tunnel->err_count > 0) { | |
bb80087a WY |
715 | if (time_before(jiffies, |
716 | tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { | |
1da177e4 LT |
717 | tunnel->err_count--; |
718 | dst_link_failure(skb); | |
719 | } else | |
720 | tunnel->err_count = 0; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Okay, now see if we can stuff it in the buffer as-is. | |
725 | */ | |
726 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
727 | ||
cfbba49d PM |
728 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
729 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
730 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
731 | if (!new_skb) { | |
732 | ip_rt_put(rt); | |
0bfbedb1 | 733 | txq->tx_dropped++; |
1da177e4 | 734 | dev_kfree_skb(skb); |
6ed10654 | 735 | return NETDEV_TX_OK; |
1da177e4 LT |
736 | } |
737 | if (skb->sk) | |
738 | skb_set_owner_w(new_skb, skb->sk); | |
739 | dev_kfree_skb(skb); | |
740 | skb = new_skb; | |
0660e03f | 741 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
742 | } |
743 | ||
b0e380b1 | 744 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
745 | skb_push(skb, sizeof(struct iphdr)); |
746 | skb_reset_network_header(skb); | |
1da177e4 | 747 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 748 | IPCB(skb)->flags = 0; |
adf30907 ED |
749 | skb_dst_drop(skb); |
750 | skb_dst_set(skb, &rt->u.dst); | |
1da177e4 LT |
751 | |
752 | /* | |
753 | * Push down and install the IPIP header. | |
754 | */ | |
755 | ||
eddc9ec5 | 756 | iph = ip_hdr(skb); |
1da177e4 LT |
757 | iph->version = 4; |
758 | iph->ihl = sizeof(struct iphdr)>>2; | |
759 | if (mtu > IPV6_MIN_MTU) | |
8945a808 | 760 | iph->frag_off = tiph->frag_off; |
1da177e4 LT |
761 | else |
762 | iph->frag_off = 0; | |
763 | ||
764 | iph->protocol = IPPROTO_IPV6; | |
765 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
766 | iph->daddr = rt->rt_dst; | |
767 | iph->saddr = rt->rt_src; | |
768 | ||
769 | if ((iph->ttl = tiph->ttl) == 0) | |
770 | iph->ttl = iph6->hop_limit; | |
771 | ||
772 | nf_reset(skb); | |
773 | ||
774 | IPTUNNEL_XMIT(); | |
6ed10654 | 775 | return NETDEV_TX_OK; |
1da177e4 LT |
776 | |
777 | tx_error_icmp: | |
778 | dst_link_failure(skb); | |
779 | tx_error: | |
780 | stats->tx_errors++; | |
781 | dev_kfree_skb(skb); | |
6ed10654 | 782 | return NETDEV_TX_OK; |
1da177e4 LT |
783 | } |
784 | ||
8a4a50f9 MS |
785 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
786 | { | |
787 | struct net_device *tdev = NULL; | |
788 | struct ip_tunnel *tunnel; | |
789 | struct iphdr *iph; | |
790 | ||
791 | tunnel = netdev_priv(dev); | |
792 | iph = &tunnel->parms.iph; | |
793 | ||
794 | if (iph->daddr) { | |
795 | struct flowi fl = { .nl_u = { .ip4_u = | |
796 | { .daddr = iph->daddr, | |
797 | .saddr = iph->saddr, | |
798 | .tos = RT_TOS(iph->tos) } }, | |
799 | .oif = tunnel->parms.link, | |
800 | .proto = IPPROTO_IPV6 }; | |
801 | struct rtable *rt; | |
907a08c4 | 802 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
803 | tdev = rt->u.dst.dev; |
804 | ip_rt_put(rt); | |
805 | } | |
806 | dev->flags |= IFF_POINTOPOINT; | |
807 | } | |
808 | ||
809 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 810 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
811 | |
812 | if (tdev) { | |
813 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
814 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
815 | if (dev->mtu < IPV6_MIN_MTU) | |
816 | dev->mtu = IPV6_MIN_MTU; | |
817 | } | |
818 | dev->iflink = tunnel->parms.link; | |
819 | } | |
820 | ||
1da177e4 LT |
821 | static int |
822 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
823 | { | |
824 | int err = 0; | |
825 | struct ip_tunnel_parm p; | |
fadf6bf0 | 826 | struct ip_tunnel_prl prl; |
1da177e4 | 827 | struct ip_tunnel *t; |
ca8def14 PE |
828 | struct net *net = dev_net(dev); |
829 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
fa857afc YH |
830 | #ifdef CONFIG_IPV6_SIT_6RD |
831 | struct ip_tunnel_6rd ip6rd; | |
832 | #endif | |
1da177e4 LT |
833 | |
834 | switch (cmd) { | |
835 | case SIOCGETTUNNEL: | |
fa857afc YH |
836 | #ifdef CONFIG_IPV6_SIT_6RD |
837 | case SIOCGET6RD: | |
838 | #endif | |
1da177e4 | 839 | t = NULL; |
cd3dbc19 | 840 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
841 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
842 | err = -EFAULT; | |
843 | break; | |
844 | } | |
ca8def14 | 845 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
846 | } |
847 | if (t == NULL) | |
2941a486 | 848 | t = netdev_priv(dev); |
fa857afc YH |
849 | |
850 | err = -EFAULT; | |
851 | if (cmd == SIOCGETTUNNEL) { | |
852 | memcpy(&p, &t->parms, sizeof(p)); | |
853 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, | |
854 | sizeof(p))) | |
855 | goto done; | |
856 | #ifdef CONFIG_IPV6_SIT_6RD | |
857 | } else { | |
858 | ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix); | |
859 | ip6rd.relay_prefix = t->ip6rd.relay_prefix; | |
860 | ip6rd.prefixlen = t->ip6rd.prefixlen; | |
861 | ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; | |
862 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, | |
863 | sizeof(ip6rd))) | |
864 | goto done; | |
865 | #endif | |
866 | } | |
867 | err = 0; | |
1da177e4 LT |
868 | break; |
869 | ||
870 | case SIOCADDTUNNEL: | |
871 | case SIOCCHGTUNNEL: | |
872 | err = -EPERM; | |
873 | if (!capable(CAP_NET_ADMIN)) | |
874 | goto done; | |
875 | ||
876 | err = -EFAULT; | |
877 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
878 | goto done; | |
879 | ||
880 | err = -EINVAL; | |
881 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
882 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
883 | goto done; | |
884 | if (p.iph.ttl) | |
885 | p.iph.frag_off |= htons(IP_DF); | |
886 | ||
ca8def14 | 887 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 888 | |
cd3dbc19 | 889 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
890 | if (t != NULL) { |
891 | if (t->dev != dev) { | |
892 | err = -EEXIST; | |
893 | break; | |
894 | } | |
895 | } else { | |
896 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
897 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
898 | err = -EINVAL; | |
899 | break; | |
900 | } | |
2941a486 | 901 | t = netdev_priv(dev); |
ca8def14 | 902 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
903 | t->parms.iph.saddr = p.iph.saddr; |
904 | t->parms.iph.daddr = p.iph.daddr; | |
905 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
906 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 907 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
908 | netdev_state_change(dev); |
909 | } | |
910 | } | |
911 | ||
912 | if (t) { | |
913 | err = 0; | |
914 | if (cmd == SIOCCHGTUNNEL) { | |
915 | t->parms.iph.ttl = p.iph.ttl; | |
916 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
917 | if (t->parms.link != p.link) { |
918 | t->parms.link = p.link; | |
919 | ipip6_tunnel_bind_dev(dev); | |
920 | netdev_state_change(dev); | |
921 | } | |
1da177e4 LT |
922 | } |
923 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
924 | err = -EFAULT; | |
925 | } else | |
926 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
927 | break; | |
928 | ||
929 | case SIOCDELTUNNEL: | |
930 | err = -EPERM; | |
931 | if (!capable(CAP_NET_ADMIN)) | |
932 | goto done; | |
933 | ||
cd3dbc19 | 934 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
935 | err = -EFAULT; |
936 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
937 | goto done; | |
938 | err = -ENOENT; | |
ca8def14 | 939 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
940 | goto done; |
941 | err = -EPERM; | |
cd3dbc19 | 942 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
943 | goto done; |
944 | dev = t->dev; | |
945 | } | |
22f8cde5 SH |
946 | unregister_netdevice(dev); |
947 | err = 0; | |
1da177e4 LT |
948 | break; |
949 | ||
300aaeea | 950 | case SIOCGETPRL: |
2b4743bd YH |
951 | err = -EINVAL; |
952 | if (dev == sitn->fb_tunnel_dev) | |
953 | goto done; | |
954 | err = -ENOENT; | |
955 | if (!(t = netdev_priv(dev))) | |
956 | goto done; | |
957 | err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); | |
958 | break; | |
959 | ||
fadf6bf0 TF |
960 | case SIOCADDPRL: |
961 | case SIOCDELPRL: | |
962 | case SIOCCHGPRL: | |
963 | err = -EPERM; | |
2b4743bd | 964 | if (!capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
965 | goto done; |
966 | err = -EINVAL; | |
cd3dbc19 | 967 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
968 | goto done; |
969 | err = -EFAULT; | |
970 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
971 | goto done; | |
972 | err = -ENOENT; | |
973 | if (!(t = netdev_priv(dev))) | |
974 | goto done; | |
975 | ||
300aaeea | 976 | switch (cmd) { |
300aaeea | 977 | case SIOCDELPRL: |
fadf6bf0 | 978 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
979 | break; |
980 | case SIOCADDPRL: | |
981 | case SIOCCHGPRL: | |
fadf6bf0 | 982 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
983 | break; |
984 | } | |
2b4743bd | 985 | netdev_state_change(dev); |
fadf6bf0 TF |
986 | break; |
987 | ||
fa857afc YH |
988 | #ifdef CONFIG_IPV6_SIT_6RD |
989 | case SIOCADD6RD: | |
990 | case SIOCCHG6RD: | |
991 | case SIOCDEL6RD: | |
992 | err = -EPERM; | |
993 | if (!capable(CAP_NET_ADMIN)) | |
994 | goto done; | |
995 | ||
996 | err = -EFAULT; | |
997 | if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, | |
998 | sizeof(ip6rd))) | |
999 | goto done; | |
1000 | ||
1001 | t = netdev_priv(dev); | |
1002 | ||
1003 | if (cmd != SIOCDEL6RD) { | |
1004 | struct in6_addr prefix; | |
1005 | __be32 relay_prefix; | |
1006 | ||
1007 | err = -EINVAL; | |
1008 | if (ip6rd.relay_prefixlen > 32 || | |
1009 | ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64) | |
1010 | goto done; | |
1011 | ||
1012 | ipv6_addr_prefix(&prefix, &ip6rd.prefix, | |
1013 | ip6rd.prefixlen); | |
1014 | if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) | |
1015 | goto done; | |
1016 | relay_prefix = ip6rd.relay_prefix & | |
1017 | htonl(0xffffffffUL << | |
1018 | (32 - ip6rd.relay_prefixlen)); | |
1019 | if (relay_prefix != ip6rd.relay_prefix) | |
1020 | goto done; | |
1021 | ||
1022 | ipv6_addr_copy(&t->ip6rd.prefix, &prefix); | |
1023 | t->ip6rd.relay_prefix = relay_prefix; | |
1024 | t->ip6rd.prefixlen = ip6rd.prefixlen; | |
1025 | t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen; | |
1026 | } else | |
1027 | ipip6_tunnel_clone_6rd(t, sitn); | |
1028 | ||
1029 | err = 0; | |
1030 | break; | |
1031 | #endif | |
1032 | ||
1da177e4 LT |
1033 | default: |
1034 | err = -EINVAL; | |
1035 | } | |
1036 | ||
1037 | done: | |
1038 | return err; | |
1039 | } | |
1040 | ||
1da177e4 LT |
1041 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) |
1042 | { | |
1043 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1044 | return -EINVAL; | |
1045 | dev->mtu = new_mtu; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1326c3d5 SH |
1049 | static const struct net_device_ops ipip6_netdev_ops = { |
1050 | .ndo_uninit = ipip6_tunnel_uninit, | |
1051 | .ndo_start_xmit = ipip6_tunnel_xmit, | |
1052 | .ndo_do_ioctl = ipip6_tunnel_ioctl, | |
1053 | .ndo_change_mtu = ipip6_tunnel_change_mtu, | |
1054 | }; | |
1055 | ||
1da177e4 LT |
1056 | static void ipip6_tunnel_setup(struct net_device *dev) |
1057 | { | |
1326c3d5 | 1058 | dev->netdev_ops = &ipip6_netdev_ops; |
1da177e4 | 1059 | dev->destructor = free_netdev; |
1da177e4 LT |
1060 | |
1061 | dev->type = ARPHRD_SIT; | |
1062 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1063 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 | 1064 | dev->flags = IFF_NOARP; |
f2ba025b | 1065 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
1066 | dev->iflink = 0; |
1067 | dev->addr_len = 4; | |
7a97146c | 1068 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
1069 | } |
1070 | ||
1326c3d5 | 1071 | static void ipip6_tunnel_init(struct net_device *dev) |
1da177e4 | 1072 | { |
1326c3d5 | 1073 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1074 | |
1075 | tunnel->dev = dev; | |
1076 | strcpy(tunnel->parms.name, dev->name); | |
1077 | ||
1078 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1079 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1080 | ||
8a4a50f9 | 1081 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1082 | } |
1083 | ||
1326c3d5 | 1084 | static void ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1085 | { |
2941a486 | 1086 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1087 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1088 | struct net *net = dev_net(dev); |
1089 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1090 | |
1091 | tunnel->dev = dev; | |
1092 | strcpy(tunnel->parms.name, dev->name); | |
1093 | ||
1094 | iph->version = 4; | |
1095 | iph->protocol = IPPROTO_IPV6; | |
1096 | iph->ihl = 5; | |
1097 | iph->ttl = 64; | |
1098 | ||
1099 | dev_hold(dev); | |
29182176 | 1100 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1101 | } |
1102 | ||
c73cb5a2 | 1103 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1104 | .handler = ipip6_rcv, |
1105 | .err_handler = ipip6_err, | |
c73cb5a2 | 1106 | .priority = 1, |
1da177e4 LT |
1107 | }; |
1108 | ||
29182176 | 1109 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
1110 | { |
1111 | int prio; | |
1112 | ||
1113 | for (prio = 1; prio < 4; prio++) { | |
1114 | int h; | |
1115 | for (h = 0; h < HASH_SIZE; h++) { | |
1116 | struct ip_tunnel *t; | |
29182176 | 1117 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1118 | unregister_netdevice(t->dev); |
1119 | } | |
1120 | } | |
1121 | } | |
1122 | ||
8190d900 PE |
1123 | static int sit_init_net(struct net *net) |
1124 | { | |
1125 | int err; | |
1126 | struct sit_net *sitn; | |
1127 | ||
1128 | err = -ENOMEM; | |
29182176 | 1129 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1130 | if (sitn == NULL) |
1131 | goto err_alloc; | |
1132 | ||
1133 | err = net_assign_generic(net, sit_net_id, sitn); | |
1134 | if (err < 0) | |
1135 | goto err_assign; | |
1136 | ||
29182176 PE |
1137 | sitn->tunnels[0] = sitn->tunnels_wc; |
1138 | sitn->tunnels[1] = sitn->tunnels_l; | |
1139 | sitn->tunnels[2] = sitn->tunnels_r; | |
1140 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1141 | ||
cd3dbc19 PE |
1142 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1143 | ipip6_tunnel_setup); | |
1144 | if (!sitn->fb_tunnel_dev) { | |
1145 | err = -ENOMEM; | |
1146 | goto err_alloc_dev; | |
1147 | } | |
be77e593 | 1148 | dev_net_set(sitn->fb_tunnel_dev, net); |
cd3dbc19 | 1149 | |
1326c3d5 | 1150 | ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1151 | |
1152 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1153 | goto err_reg_dev; | |
1154 | ||
8190d900 PE |
1155 | return 0; |
1156 | ||
cd3dbc19 | 1157 | err_reg_dev: |
1326c3d5 | 1158 | dev_put(sitn->fb_tunnel_dev); |
cd3dbc19 PE |
1159 | free_netdev(sitn->fb_tunnel_dev); |
1160 | err_alloc_dev: | |
1161 | /* nothing */ | |
8190d900 PE |
1162 | err_assign: |
1163 | kfree(sitn); | |
1164 | err_alloc: | |
1165 | return err; | |
1166 | } | |
1167 | ||
1168 | static void sit_exit_net(struct net *net) | |
1169 | { | |
1170 | struct sit_net *sitn; | |
1171 | ||
1172 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1173 | rtnl_lock(); |
29182176 | 1174 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1175 | unregister_netdevice(sitn->fb_tunnel_dev); |
1176 | rtnl_unlock(); | |
8190d900 PE |
1177 | kfree(sitn); |
1178 | } | |
1179 | ||
1180 | static struct pernet_operations sit_net_ops = { | |
1181 | .init = sit_init_net, | |
1182 | .exit = sit_exit_net, | |
1183 | }; | |
1184 | ||
89c89458 | 1185 | static void __exit sit_cleanup(void) |
1da177e4 | 1186 | { |
c73cb5a2 | 1187 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1188 | |
8190d900 | 1189 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1190 | } |
1191 | ||
89c89458 | 1192 | static int __init sit_init(void) |
1da177e4 LT |
1193 | { |
1194 | int err; | |
1195 | ||
1196 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1197 | ||
c73cb5a2 | 1198 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1199 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1200 | return -EAGAIN; | |
1201 | } | |
1202 | ||
8190d900 PE |
1203 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1204 | if (err < 0) | |
cd3dbc19 | 1205 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1206 | |
1da177e4 | 1207 | return err; |
1da177e4 | 1208 | } |
989e5b96 JR |
1209 | |
1210 | module_init(sit_init); | |
1211 | module_exit(sit_cleanup); | |
39c85086 | 1212 | MODULE_LICENSE("GPL"); |
daccff02 | 1213 | MODULE_ALIAS("sit0"); |