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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
8 | * | |
9 | * $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $ | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * Changes: | |
17 | * Roger Venning <r.venning@telstra.com>: 6to4 support | |
18 | * Nate Thompson <nate@thebog.net>: 6to4 support | |
fadf6bf0 | 19 | * Fred Templin <fred.l.templin@boeing.com>: isatap support |
1da177e4 LT |
20 | */ |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
4fc268d2 | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/icmp.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/netfilter_ipv4.h> | |
46f25dff | 36 | #include <linux/if_ether.h> |
1da177e4 LT |
37 | |
38 | #include <net/sock.h> | |
39 | #include <net/snmp.h> | |
40 | ||
41 | #include <net/ipv6.h> | |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_fib.h> | |
45 | #include <net/ip6_route.h> | |
46 | #include <net/ndisc.h> | |
47 | #include <net/addrconf.h> | |
48 | #include <net/ip.h> | |
49 | #include <net/udp.h> | |
50 | #include <net/icmp.h> | |
51 | #include <net/ipip.h> | |
52 | #include <net/inet_ecn.h> | |
53 | #include <net/xfrm.h> | |
54 | #include <net/dsfield.h> | |
8190d900 PE |
55 | #include <net/net_namespace.h> |
56 | #include <net/netns/generic.h> | |
1da177e4 LT |
57 | |
58 | /* | |
59 | This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c | |
60 | ||
61 | For comments look at net/ipv4/ip_gre.c --ANK | |
62 | */ | |
63 | ||
64 | #define HASH_SIZE 16 | |
e69a4adc | 65 | #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) |
1da177e4 LT |
66 | |
67 | static int ipip6_fb_tunnel_init(struct net_device *dev); | |
68 | static int ipip6_tunnel_init(struct net_device *dev); | |
69 | static void ipip6_tunnel_setup(struct net_device *dev); | |
70 | ||
8190d900 PE |
71 | static int sit_net_id; |
72 | struct sit_net { | |
29182176 PE |
73 | struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
74 | struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
75 | struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
76 | struct ip_tunnel *tunnels_wc[1]; | |
77 | struct ip_tunnel **tunnels[4]; | |
78 | ||
cd3dbc19 | 79 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
80 | }; |
81 | ||
1da177e4 LT |
82 | static DEFINE_RWLOCK(ipip6_lock); |
83 | ||
ca8def14 PE |
84 | static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net, |
85 | __be32 remote, __be32 local) | |
1da177e4 LT |
86 | { |
87 | unsigned h0 = HASH(remote); | |
88 | unsigned h1 = HASH(local); | |
89 | struct ip_tunnel *t; | |
29182176 | 90 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 91 | |
29182176 | 92 | for (t = sitn->tunnels_r_l[h0^h1]; t; t = t->next) { |
1da177e4 LT |
93 | if (local == t->parms.iph.saddr && |
94 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
95 | return t; | |
96 | } | |
29182176 | 97 | for (t = sitn->tunnels_r[h0]; t; t = t->next) { |
1da177e4 LT |
98 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) |
99 | return t; | |
100 | } | |
29182176 | 101 | for (t = sitn->tunnels_l[h1]; t; t = t->next) { |
1da177e4 LT |
102 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) |
103 | return t; | |
104 | } | |
29182176 | 105 | if ((t = sitn->tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) |
1da177e4 LT |
106 | return t; |
107 | return NULL; | |
108 | } | |
109 | ||
ca8def14 PE |
110 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
111 | struct ip_tunnel_parm *parms) | |
1da177e4 | 112 | { |
420fe234 YH |
113 | __be32 remote = parms->iph.daddr; |
114 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
115 | unsigned h = 0; |
116 | int prio = 0; | |
117 | ||
118 | if (remote) { | |
119 | prio |= 2; | |
120 | h ^= HASH(remote); | |
121 | } | |
122 | if (local) { | |
123 | prio |= 1; | |
124 | h ^= HASH(local); | |
125 | } | |
29182176 | 126 | return &sitn->tunnels[prio][h]; |
1da177e4 LT |
127 | } |
128 | ||
ca8def14 PE |
129 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
130 | struct ip_tunnel *t) | |
420fe234 | 131 | { |
ca8def14 | 132 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
133 | } |
134 | ||
ca8def14 | 135 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
136 | { |
137 | struct ip_tunnel **tp; | |
138 | ||
ca8def14 | 139 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
140 | if (t == *tp) { |
141 | write_lock_bh(&ipip6_lock); | |
142 | *tp = t->next; | |
143 | write_unlock_bh(&ipip6_lock); | |
144 | break; | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
ca8def14 | 149 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 150 | { |
ca8def14 | 151 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
152 | |
153 | t->next = *tp; | |
154 | write_lock_bh(&ipip6_lock); | |
155 | *tp = t; | |
156 | write_unlock_bh(&ipip6_lock); | |
157 | } | |
158 | ||
ca8def14 PE |
159 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
160 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 161 | { |
e69a4adc AV |
162 | __be32 remote = parms->iph.daddr; |
163 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
164 | struct ip_tunnel *t, **tp, *nt; |
165 | struct net_device *dev; | |
1da177e4 | 166 | char name[IFNAMSIZ]; |
ca8def14 | 167 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 168 | |
ca8def14 | 169 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
170 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
171 | return t; | |
172 | } | |
173 | if (!create) | |
174 | goto failed; | |
175 | ||
176 | if (parms->name[0]) | |
177 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
178 | else |
179 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
180 | |
181 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
182 | if (dev == NULL) | |
183 | return NULL; | |
184 | ||
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 LT |
403 | { |
404 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
405 | ||
406 | /* It is not :-( All the routers (except for Linux) return only | |
407 | 8 bytes of packet payload. It means, that precise relaying of | |
408 | ICMP in the real Internet is absolutely infeasible. | |
409 | */ | |
410 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
411 | const int type = icmp_hdr(skb)->type; |
412 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 413 | struct ip_tunnel *t; |
c73cb5a2 | 414 | int err; |
1da177e4 LT |
415 | |
416 | switch (type) { | |
417 | default: | |
418 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 419 | return 0; |
1da177e4 LT |
420 | |
421 | case ICMP_DEST_UNREACH: | |
422 | switch (code) { | |
423 | case ICMP_SR_FAILED: | |
424 | case ICMP_PORT_UNREACH: | |
425 | /* Impossible event. */ | |
c73cb5a2 | 426 | return 0; |
1da177e4 LT |
427 | case ICMP_FRAG_NEEDED: |
428 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 429 | return 0; |
1da177e4 LT |
430 | default: |
431 | /* All others are translated to HOST_UNREACH. | |
432 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
433 | I believe they are just ether pollution. --ANK | |
434 | */ | |
435 | break; | |
436 | } | |
437 | break; | |
438 | case ICMP_TIME_EXCEEDED: | |
439 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 440 | return 0; |
1da177e4 LT |
441 | break; |
442 | } | |
443 | ||
c73cb5a2 KM |
444 | err = -ENOENT; |
445 | ||
1da177e4 | 446 | read_lock(&ipip6_lock); |
fcee5ec9 | 447 | t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
448 | if (t == NULL || t->parms.iph.daddr == 0) |
449 | goto out; | |
c73cb5a2 KM |
450 | |
451 | err = 0; | |
1da177e4 LT |
452 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
453 | goto out; | |
454 | ||
455 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
456 | t->err_count++; | |
457 | else | |
458 | t->err_count = 1; | |
459 | t->err_time = jiffies; | |
460 | out: | |
461 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 462 | return err; |
1da177e4 LT |
463 | #else |
464 | struct iphdr *iph = (struct iphdr*)dp; | |
465 | int hlen = iph->ihl<<2; | |
466 | struct ipv6hdr *iph6; | |
88c7664f ACM |
467 | const int type = icmp_hdr(skb)->type; |
468 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
469 | int rel_type = 0; |
470 | int rel_code = 0; | |
471 | int rel_info = 0; | |
472 | struct sk_buff *skb2; | |
473 | struct rt6_info *rt6i; | |
474 | ||
475 | if (len < hlen + sizeof(struct ipv6hdr)) | |
476 | return; | |
477 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
478 | ||
479 | switch (type) { | |
480 | default: | |
481 | return; | |
482 | case ICMP_PARAMETERPROB: | |
88c7664f | 483 | if (icmp_hdr(skb)->un.gateway < hlen) |
1da177e4 LT |
484 | return; |
485 | ||
486 | /* So... This guy found something strange INSIDE encapsulated | |
487 | packet. Well, he is fool, but what can we do ? | |
488 | */ | |
489 | rel_type = ICMPV6_PARAMPROB; | |
88c7664f | 490 | rel_info = icmp_hdr(skb)->un.gateway - hlen; |
1da177e4 LT |
491 | break; |
492 | ||
493 | case ICMP_DEST_UNREACH: | |
494 | switch (code) { | |
495 | case ICMP_SR_FAILED: | |
496 | case ICMP_PORT_UNREACH: | |
497 | /* Impossible event. */ | |
498 | return; | |
499 | case ICMP_FRAG_NEEDED: | |
500 | /* Too complicated case ... */ | |
501 | return; | |
502 | default: | |
503 | /* All others are translated to HOST_UNREACH. | |
504 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
505 | I believe, it is just ether pollution. --ANK | |
506 | */ | |
507 | rel_type = ICMPV6_DEST_UNREACH; | |
508 | rel_code = ICMPV6_ADDR_UNREACH; | |
509 | break; | |
510 | } | |
511 | break; | |
512 | case ICMP_TIME_EXCEEDED: | |
513 | if (code != ICMP_EXC_TTL) | |
514 | return; | |
515 | rel_type = ICMPV6_TIME_EXCEED; | |
516 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
517 | break; | |
518 | } | |
519 | ||
520 | /* Prepare fake skb to feed it to icmpv6_send */ | |
521 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
522 | if (skb2 == NULL) | |
c73cb5a2 | 523 | return 0; |
1da177e4 LT |
524 | dst_release(skb2->dst); |
525 | skb2->dst = NULL; | |
526 | skb_pull(skb2, skb->data - (u8*)iph6); | |
c1d2bbe1 | 527 | skb_reset_network_header(skb2); |
1da177e4 LT |
528 | |
529 | /* Try to guess incoming interface */ | |
907a08c4 | 530 | rt6i = rt6_lookup(dev_net(skb->dev), &iph6->saddr, NULL, NULL, 0); |
1da177e4 LT |
531 | if (rt6i && rt6i->rt6i_dev) { |
532 | skb2->dev = rt6i->rt6i_dev; | |
533 | ||
907a08c4 PE |
534 | rt6i = rt6_lookup(dev_net(skb->dev), |
535 | &iph6->daddr, &iph6->saddr, NULL, 0); | |
1da177e4 LT |
536 | |
537 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
2941a486 | 538 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); |
1da177e4 LT |
539 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { |
540 | rel_type = ICMPV6_DEST_UNREACH; | |
541 | rel_code = ICMPV6_ADDR_UNREACH; | |
542 | } | |
543 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
544 | } | |
545 | } | |
546 | kfree_skb(skb2); | |
c73cb5a2 | 547 | return 0; |
1da177e4 LT |
548 | #endif |
549 | } | |
550 | ||
551 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
552 | { | |
553 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 554 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
555 | } |
556 | ||
557 | static int ipip6_rcv(struct sk_buff *skb) | |
558 | { | |
559 | struct iphdr *iph; | |
560 | struct ip_tunnel *tunnel; | |
561 | ||
562 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
563 | goto out; | |
564 | ||
eddc9ec5 | 565 | iph = ip_hdr(skb); |
1da177e4 LT |
566 | |
567 | read_lock(&ipip6_lock); | |
fcee5ec9 | 568 | if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), |
ca8def14 | 569 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 | 570 | secpath_reset(skb); |
b0e380b1 | 571 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 572 | skb_reset_network_header(skb); |
8cdfab8a | 573 | IPCB(skb)->flags = 0; |
1da177e4 LT |
574 | skb->protocol = htons(ETH_P_IPV6); |
575 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
576 | |
577 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 578 | !isatap_chksrc(skb, iph, tunnel)) { |
c7dc89c0 FT |
579 | tunnel->stat.rx_errors++; |
580 | read_unlock(&ipip6_lock); | |
581 | kfree_skb(skb); | |
582 | return 0; | |
583 | } | |
1da177e4 LT |
584 | tunnel->stat.rx_packets++; |
585 | tunnel->stat.rx_bytes += skb->len; | |
586 | skb->dev = tunnel->dev; | |
587 | dst_release(skb->dst); | |
588 | skb->dst = NULL; | |
589 | nf_reset(skb); | |
590 | ipip6_ecn_decapsulate(iph, skb); | |
591 | netif_rx(skb); | |
592 | read_unlock(&ipip6_lock); | |
593 | return 0; | |
594 | } | |
595 | ||
45af08be | 596 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
597 | kfree_skb(skb); |
598 | read_unlock(&ipip6_lock); | |
599 | out: | |
600 | return 0; | |
601 | } | |
602 | ||
603 | /* Returns the embedded IPv4 address if the IPv6 address | |
604 | comes from 6to4 (RFC 3056) addr space */ | |
605 | ||
e69a4adc | 606 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 607 | { |
e69a4adc | 608 | __be32 dst = 0; |
1da177e4 LT |
609 | |
610 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 611 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
612 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
613 | } | |
614 | return dst; | |
615 | } | |
616 | ||
617 | /* | |
618 | * This function assumes it is being called from dev_queue_xmit() | |
619 | * and that skb is filled properly by that function. | |
620 | */ | |
621 | ||
622 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
623 | { | |
2941a486 | 624 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
625 | struct net_device_stats *stats = &tunnel->stat; |
626 | struct iphdr *tiph = &tunnel->parms.iph; | |
0660e03f | 627 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
628 | u8 tos = tunnel->parms.iph.tos; |
629 | struct rtable *rt; /* Route to the other host */ | |
630 | struct net_device *tdev; /* Device to other host */ | |
631 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 632 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 633 | __be32 dst = tiph->daddr; |
1da177e4 | 634 | int mtu; |
1ab1457c | 635 | struct in6_addr *addr6; |
1da177e4 LT |
636 | int addr_type; |
637 | ||
638 | if (tunnel->recursion++) { | |
639 | tunnel->stat.collisions++; | |
640 | goto tx_error; | |
641 | } | |
642 | ||
643 | if (skb->protocol != htons(ETH_P_IPV6)) | |
644 | goto tx_error; | |
645 | ||
c7dc89c0 FT |
646 | /* ISATAP (RFC4214) - must come before 6to4 */ |
647 | if (dev->priv_flags & IFF_ISATAP) { | |
648 | struct neighbour *neigh = NULL; | |
649 | ||
650 | if (skb->dst) | |
651 | neigh = skb->dst->neighbour; | |
652 | ||
653 | if (neigh == NULL) { | |
654 | if (net_ratelimit()) | |
655 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
656 | goto tx_error; | |
657 | } | |
658 | ||
659 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
660 | addr_type = ipv6_addr_type(addr6); | |
661 | ||
662 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
663 | ipv6_addr_is_isatap(addr6)) | |
664 | dst = addr6->s6_addr32[3]; | |
665 | else | |
666 | goto tx_error; | |
667 | } | |
668 | ||
1da177e4 LT |
669 | if (!dst) |
670 | dst = try_6to4(&iph6->daddr); | |
671 | ||
672 | if (!dst) { | |
673 | struct neighbour *neigh = NULL; | |
674 | ||
675 | if (skb->dst) | |
676 | neigh = skb->dst->neighbour; | |
677 | ||
678 | if (neigh == NULL) { | |
679 | if (net_ratelimit()) | |
680 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
681 | goto tx_error; | |
682 | } | |
683 | ||
684 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
685 | addr_type = ipv6_addr_type(addr6); | |
686 | ||
687 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 688 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
689 | addr_type = ipv6_addr_type(addr6); |
690 | } | |
691 | ||
692 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
693 | goto tx_error_icmp; | |
694 | ||
695 | dst = addr6->s6_addr32[3]; | |
696 | } | |
697 | ||
698 | { | |
699 | struct flowi fl = { .nl_u = { .ip4_u = | |
700 | { .daddr = dst, | |
701 | .saddr = tiph->saddr, | |
702 | .tos = RT_TOS(tos) } }, | |
703 | .oif = tunnel->parms.link, | |
704 | .proto = IPPROTO_IPV6 }; | |
907a08c4 | 705 | if (ip_route_output_key(dev_net(dev), &rt, &fl)) { |
1da177e4 LT |
706 | tunnel->stat.tx_carrier_errors++; |
707 | goto tx_error_icmp; | |
708 | } | |
709 | } | |
710 | if (rt->rt_type != RTN_UNICAST) { | |
711 | ip_rt_put(rt); | |
712 | tunnel->stat.tx_carrier_errors++; | |
713 | goto tx_error_icmp; | |
714 | } | |
715 | tdev = rt->u.dst.dev; | |
716 | ||
717 | if (tdev == dev) { | |
718 | ip_rt_put(rt); | |
719 | tunnel->stat.collisions++; | |
720 | goto tx_error; | |
721 | } | |
722 | ||
723 | if (tiph->frag_off) | |
724 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
725 | else | |
726 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
727 | ||
728 | if (mtu < 68) { | |
729 | tunnel->stat.collisions++; | |
730 | ip_rt_put(rt); | |
731 | goto tx_error; | |
732 | } | |
733 | if (mtu < IPV6_MIN_MTU) | |
734 | mtu = IPV6_MIN_MTU; | |
735 | if (tunnel->parms.iph.daddr && skb->dst) | |
736 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
737 | ||
738 | if (skb->len > mtu) { | |
739 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
740 | ip_rt_put(rt); | |
741 | goto tx_error; | |
742 | } | |
743 | ||
744 | if (tunnel->err_count > 0) { | |
745 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
746 | tunnel->err_count--; | |
747 | dst_link_failure(skb); | |
748 | } else | |
749 | tunnel->err_count = 0; | |
750 | } | |
751 | ||
752 | /* | |
753 | * Okay, now see if we can stuff it in the buffer as-is. | |
754 | */ | |
755 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
756 | ||
cfbba49d PM |
757 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
758 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
759 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
760 | if (!new_skb) { | |
761 | ip_rt_put(rt); | |
1ab1457c | 762 | stats->tx_dropped++; |
1da177e4 LT |
763 | dev_kfree_skb(skb); |
764 | tunnel->recursion--; | |
765 | return 0; | |
766 | } | |
767 | if (skb->sk) | |
768 | skb_set_owner_w(new_skb, skb->sk); | |
769 | dev_kfree_skb(skb); | |
770 | skb = new_skb; | |
0660e03f | 771 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
772 | } |
773 | ||
b0e380b1 | 774 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
775 | skb_push(skb, sizeof(struct iphdr)); |
776 | skb_reset_network_header(skb); | |
1da177e4 | 777 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 778 | IPCB(skb)->flags = 0; |
1da177e4 LT |
779 | dst_release(skb->dst); |
780 | skb->dst = &rt->u.dst; | |
781 | ||
782 | /* | |
783 | * Push down and install the IPIP header. | |
784 | */ | |
785 | ||
eddc9ec5 | 786 | iph = ip_hdr(skb); |
1da177e4 LT |
787 | iph->version = 4; |
788 | iph->ihl = sizeof(struct iphdr)>>2; | |
789 | if (mtu > IPV6_MIN_MTU) | |
790 | iph->frag_off = htons(IP_DF); | |
791 | else | |
792 | iph->frag_off = 0; | |
793 | ||
794 | iph->protocol = IPPROTO_IPV6; | |
795 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
796 | iph->daddr = rt->rt_dst; | |
797 | iph->saddr = rt->rt_src; | |
798 | ||
799 | if ((iph->ttl = tiph->ttl) == 0) | |
800 | iph->ttl = iph6->hop_limit; | |
801 | ||
802 | nf_reset(skb); | |
803 | ||
804 | IPTUNNEL_XMIT(); | |
805 | tunnel->recursion--; | |
806 | return 0; | |
807 | ||
808 | tx_error_icmp: | |
809 | dst_link_failure(skb); | |
810 | tx_error: | |
811 | stats->tx_errors++; | |
812 | dev_kfree_skb(skb); | |
813 | tunnel->recursion--; | |
814 | return 0; | |
815 | } | |
816 | ||
8a4a50f9 MS |
817 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
818 | { | |
819 | struct net_device *tdev = NULL; | |
820 | struct ip_tunnel *tunnel; | |
821 | struct iphdr *iph; | |
822 | ||
823 | tunnel = netdev_priv(dev); | |
824 | iph = &tunnel->parms.iph; | |
825 | ||
826 | if (iph->daddr) { | |
827 | struct flowi fl = { .nl_u = { .ip4_u = | |
828 | { .daddr = iph->daddr, | |
829 | .saddr = iph->saddr, | |
830 | .tos = RT_TOS(iph->tos) } }, | |
831 | .oif = tunnel->parms.link, | |
832 | .proto = IPPROTO_IPV6 }; | |
833 | struct rtable *rt; | |
907a08c4 | 834 | if (!ip_route_output_key(dev_net(dev), &rt, &fl)) { |
8a4a50f9 MS |
835 | tdev = rt->u.dst.dev; |
836 | ip_rt_put(rt); | |
837 | } | |
838 | dev->flags |= IFF_POINTOPOINT; | |
839 | } | |
840 | ||
841 | if (!tdev && tunnel->parms.link) | |
907a08c4 | 842 | tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); |
8a4a50f9 MS |
843 | |
844 | if (tdev) { | |
845 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
846 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
847 | if (dev->mtu < IPV6_MIN_MTU) | |
848 | dev->mtu = IPV6_MIN_MTU; | |
849 | } | |
850 | dev->iflink = tunnel->parms.link; | |
851 | } | |
852 | ||
1da177e4 LT |
853 | static int |
854 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
855 | { | |
856 | int err = 0; | |
857 | struct ip_tunnel_parm p; | |
fadf6bf0 | 858 | struct ip_tunnel_prl prl; |
1da177e4 | 859 | struct ip_tunnel *t; |
ca8def14 PE |
860 | struct net *net = dev_net(dev); |
861 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
862 | |
863 | switch (cmd) { | |
864 | case SIOCGETTUNNEL: | |
865 | t = NULL; | |
cd3dbc19 | 866 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
867 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
868 | err = -EFAULT; | |
869 | break; | |
870 | } | |
ca8def14 | 871 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
872 | } |
873 | if (t == NULL) | |
2941a486 | 874 | t = netdev_priv(dev); |
1da177e4 LT |
875 | memcpy(&p, &t->parms, sizeof(p)); |
876 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
877 | err = -EFAULT; | |
878 | break; | |
879 | ||
880 | case SIOCADDTUNNEL: | |
881 | case SIOCCHGTUNNEL: | |
882 | err = -EPERM; | |
883 | if (!capable(CAP_NET_ADMIN)) | |
884 | goto done; | |
885 | ||
886 | err = -EFAULT; | |
887 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
888 | goto done; | |
889 | ||
890 | err = -EINVAL; | |
891 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
892 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
893 | goto done; | |
894 | if (p.iph.ttl) | |
895 | p.iph.frag_off |= htons(IP_DF); | |
896 | ||
ca8def14 | 897 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 898 | |
cd3dbc19 | 899 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
900 | if (t != NULL) { |
901 | if (t->dev != dev) { | |
902 | err = -EEXIST; | |
903 | break; | |
904 | } | |
905 | } else { | |
906 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
907 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
908 | err = -EINVAL; | |
909 | break; | |
910 | } | |
2941a486 | 911 | t = netdev_priv(dev); |
ca8def14 | 912 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
913 | t->parms.iph.saddr = p.iph.saddr; |
914 | t->parms.iph.daddr = p.iph.daddr; | |
915 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
916 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 917 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
918 | netdev_state_change(dev); |
919 | } | |
920 | } | |
921 | ||
922 | if (t) { | |
923 | err = 0; | |
924 | if (cmd == SIOCCHGTUNNEL) { | |
925 | t->parms.iph.ttl = p.iph.ttl; | |
926 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
927 | if (t->parms.link != p.link) { |
928 | t->parms.link = p.link; | |
929 | ipip6_tunnel_bind_dev(dev); | |
930 | netdev_state_change(dev); | |
931 | } | |
1da177e4 LT |
932 | } |
933 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
934 | err = -EFAULT; | |
935 | } else | |
936 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
937 | break; | |
938 | ||
939 | case SIOCDELTUNNEL: | |
940 | err = -EPERM; | |
941 | if (!capable(CAP_NET_ADMIN)) | |
942 | goto done; | |
943 | ||
cd3dbc19 | 944 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
945 | err = -EFAULT; |
946 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
947 | goto done; | |
948 | err = -ENOENT; | |
ca8def14 | 949 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
950 | goto done; |
951 | err = -EPERM; | |
cd3dbc19 | 952 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
953 | goto done; |
954 | dev = t->dev; | |
955 | } | |
22f8cde5 SH |
956 | unregister_netdevice(dev); |
957 | err = 0; | |
1da177e4 LT |
958 | break; |
959 | ||
300aaeea | 960 | case SIOCGETPRL: |
fadf6bf0 TF |
961 | case SIOCADDPRL: |
962 | case SIOCDELPRL: | |
963 | case SIOCCHGPRL: | |
964 | err = -EPERM; | |
300aaeea | 965 | if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
966 | goto done; |
967 | err = -EINVAL; | |
cd3dbc19 | 968 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
969 | goto done; |
970 | err = -EFAULT; | |
971 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
972 | goto done; | |
973 | err = -ENOENT; | |
974 | if (!(t = netdev_priv(dev))) | |
975 | goto done; | |
976 | ||
300aaeea YH |
977 | switch (cmd) { |
978 | case SIOCGETPRL: | |
979 | err = ipip6_tunnel_get_prl(t, &prl); | |
980 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, | |
981 | &prl, sizeof(prl))) | |
982 | err = -EFAULT; | |
983 | break; | |
984 | case SIOCDELPRL: | |
fadf6bf0 | 985 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
986 | break; |
987 | case SIOCADDPRL: | |
988 | case SIOCCHGPRL: | |
fadf6bf0 | 989 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
990 | break; |
991 | } | |
992 | if (cmd != SIOCGETPRL) | |
993 | netdev_state_change(dev); | |
fadf6bf0 TF |
994 | break; |
995 | ||
1da177e4 LT |
996 | default: |
997 | err = -EINVAL; | |
998 | } | |
999 | ||
1000 | done: | |
1001 | return err; | |
1002 | } | |
1003 | ||
1004 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
1005 | { | |
2941a486 | 1006 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1010 | { | |
1011 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1012 | return -EINVAL; | |
1013 | dev->mtu = new_mtu; | |
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1018 | { | |
1da177e4 LT |
1019 | dev->uninit = ipip6_tunnel_uninit; |
1020 | dev->destructor = free_netdev; | |
1021 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
1022 | dev->get_stats = ipip6_tunnel_get_stats; | |
1023 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
1024 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
1025 | ||
1026 | dev->type = ARPHRD_SIT; | |
1027 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1028 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
1029 | dev->flags = IFF_NOARP; |
1030 | dev->iflink = 0; | |
1031 | dev->addr_len = 4; | |
1032 | } | |
1033 | ||
1034 | static int ipip6_tunnel_init(struct net_device *dev) | |
1035 | { | |
1da177e4 | 1036 | struct ip_tunnel *tunnel; |
1da177e4 | 1037 | |
2941a486 | 1038 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1039 | |
1040 | tunnel->dev = dev; | |
1041 | strcpy(tunnel->parms.name, dev->name); | |
1042 | ||
1043 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1044 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1045 | ||
8a4a50f9 | 1046 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1047 | |
1048 | return 0; | |
1049 | } | |
1050 | ||
cd3dbc19 | 1051 | static int ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1052 | { |
2941a486 | 1053 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 | 1054 | struct iphdr *iph = &tunnel->parms.iph; |
29182176 PE |
1055 | struct net *net = dev_net(dev); |
1056 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
1057 | |
1058 | tunnel->dev = dev; | |
1059 | strcpy(tunnel->parms.name, dev->name); | |
1060 | ||
1061 | iph->version = 4; | |
1062 | iph->protocol = IPPROTO_IPV6; | |
1063 | iph->ihl = 5; | |
1064 | iph->ttl = 64; | |
1065 | ||
1066 | dev_hold(dev); | |
29182176 | 1067 | sitn->tunnels_wc[0] = tunnel; |
1da177e4 LT |
1068 | return 0; |
1069 | } | |
1070 | ||
c73cb5a2 | 1071 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1072 | .handler = ipip6_rcv, |
1073 | .err_handler = ipip6_err, | |
c73cb5a2 | 1074 | .priority = 1, |
1da177e4 LT |
1075 | }; |
1076 | ||
29182176 | 1077 | static void sit_destroy_tunnels(struct sit_net *sitn) |
db44575f AK |
1078 | { |
1079 | int prio; | |
1080 | ||
1081 | for (prio = 1; prio < 4; prio++) { | |
1082 | int h; | |
1083 | for (h = 0; h < HASH_SIZE; h++) { | |
1084 | struct ip_tunnel *t; | |
29182176 | 1085 | while ((t = sitn->tunnels[prio][h]) != NULL) |
db44575f AK |
1086 | unregister_netdevice(t->dev); |
1087 | } | |
1088 | } | |
1089 | } | |
1090 | ||
8190d900 PE |
1091 | static int sit_init_net(struct net *net) |
1092 | { | |
1093 | int err; | |
1094 | struct sit_net *sitn; | |
1095 | ||
1096 | err = -ENOMEM; | |
29182176 | 1097 | sitn = kzalloc(sizeof(struct sit_net), GFP_KERNEL); |
8190d900 PE |
1098 | if (sitn == NULL) |
1099 | goto err_alloc; | |
1100 | ||
1101 | err = net_assign_generic(net, sit_net_id, sitn); | |
1102 | if (err < 0) | |
1103 | goto err_assign; | |
1104 | ||
29182176 PE |
1105 | sitn->tunnels[0] = sitn->tunnels_wc; |
1106 | sitn->tunnels[1] = sitn->tunnels_l; | |
1107 | sitn->tunnels[2] = sitn->tunnels_r; | |
1108 | sitn->tunnels[3] = sitn->tunnels_r_l; | |
1109 | ||
cd3dbc19 PE |
1110 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1111 | ipip6_tunnel_setup); | |
1112 | if (!sitn->fb_tunnel_dev) { | |
1113 | err = -ENOMEM; | |
1114 | goto err_alloc_dev; | |
1115 | } | |
1116 | ||
1117 | sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
1118 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1119 | ||
1120 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1121 | goto err_reg_dev; | |
1122 | ||
8190d900 PE |
1123 | return 0; |
1124 | ||
cd3dbc19 PE |
1125 | err_reg_dev: |
1126 | free_netdev(sitn->fb_tunnel_dev); | |
1127 | err_alloc_dev: | |
1128 | /* nothing */ | |
8190d900 PE |
1129 | err_assign: |
1130 | kfree(sitn); | |
1131 | err_alloc: | |
1132 | return err; | |
1133 | } | |
1134 | ||
1135 | static void sit_exit_net(struct net *net) | |
1136 | { | |
1137 | struct sit_net *sitn; | |
1138 | ||
1139 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 | 1140 | rtnl_lock(); |
29182176 | 1141 | sit_destroy_tunnels(sitn); |
cd3dbc19 PE |
1142 | unregister_netdevice(sitn->fb_tunnel_dev); |
1143 | rtnl_unlock(); | |
8190d900 PE |
1144 | kfree(sitn); |
1145 | } | |
1146 | ||
1147 | static struct pernet_operations sit_net_ops = { | |
1148 | .init = sit_init_net, | |
1149 | .exit = sit_exit_net, | |
1150 | }; | |
1151 | ||
89c89458 | 1152 | static void __exit sit_cleanup(void) |
1da177e4 | 1153 | { |
c73cb5a2 | 1154 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f | 1155 | |
8190d900 | 1156 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); |
1da177e4 LT |
1157 | } |
1158 | ||
89c89458 | 1159 | static int __init sit_init(void) |
1da177e4 LT |
1160 | { |
1161 | int err; | |
1162 | ||
1163 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1164 | ||
c73cb5a2 | 1165 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1166 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1167 | return -EAGAIN; | |
1168 | } | |
1169 | ||
8190d900 PE |
1170 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1171 | if (err < 0) | |
cd3dbc19 | 1172 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1173 | |
1da177e4 | 1174 | return err; |
1da177e4 | 1175 | } |
989e5b96 JR |
1176 | |
1177 | module_init(sit_init); | |
1178 | module_exit(sit_cleanup); | |
39c85086 | 1179 | MODULE_LICENSE("GPL"); |
daccff02 | 1180 | MODULE_ALIAS("sit0"); |