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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 { | |
cd3dbc19 | 73 | struct net_device *fb_tunnel_dev; |
8190d900 PE |
74 | }; |
75 | ||
1da177e4 LT |
76 | static struct ip_tunnel *tunnels_r_l[HASH_SIZE]; |
77 | static struct ip_tunnel *tunnels_r[HASH_SIZE]; | |
78 | static struct ip_tunnel *tunnels_l[HASH_SIZE]; | |
79 | static struct ip_tunnel *tunnels_wc[1]; | |
80 | static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l }; | |
81 | ||
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; | |
90 | ||
91 | for (t = tunnels_r_l[h0^h1]; t; t = t->next) { | |
92 | if (local == t->parms.iph.saddr && | |
93 | remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
94 | return t; | |
95 | } | |
96 | for (t = tunnels_r[h0]; t; t = t->next) { | |
97 | if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP)) | |
98 | return t; | |
99 | } | |
100 | for (t = tunnels_l[h1]; t; t = t->next) { | |
101 | if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP)) | |
102 | return t; | |
103 | } | |
104 | if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP)) | |
105 | return t; | |
106 | return NULL; | |
107 | } | |
108 | ||
ca8def14 PE |
109 | static struct ip_tunnel **__ipip6_bucket(struct sit_net *sitn, |
110 | struct ip_tunnel_parm *parms) | |
1da177e4 | 111 | { |
420fe234 YH |
112 | __be32 remote = parms->iph.daddr; |
113 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
114 | unsigned h = 0; |
115 | int prio = 0; | |
116 | ||
117 | if (remote) { | |
118 | prio |= 2; | |
119 | h ^= HASH(remote); | |
120 | } | |
121 | if (local) { | |
122 | prio |= 1; | |
123 | h ^= HASH(local); | |
124 | } | |
125 | return &tunnels[prio][h]; | |
126 | } | |
127 | ||
ca8def14 PE |
128 | static inline struct ip_tunnel **ipip6_bucket(struct sit_net *sitn, |
129 | struct ip_tunnel *t) | |
420fe234 | 130 | { |
ca8def14 | 131 | return __ipip6_bucket(sitn, &t->parms); |
420fe234 YH |
132 | } |
133 | ||
ca8def14 | 134 | static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 LT |
135 | { |
136 | struct ip_tunnel **tp; | |
137 | ||
ca8def14 | 138 | for (tp = ipip6_bucket(sitn, t); *tp; tp = &(*tp)->next) { |
1da177e4 LT |
139 | if (t == *tp) { |
140 | write_lock_bh(&ipip6_lock); | |
141 | *tp = t->next; | |
142 | write_unlock_bh(&ipip6_lock); | |
143 | break; | |
144 | } | |
145 | } | |
146 | } | |
147 | ||
ca8def14 | 148 | static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) |
1da177e4 | 149 | { |
ca8def14 | 150 | struct ip_tunnel **tp = ipip6_bucket(sitn, t); |
1da177e4 LT |
151 | |
152 | t->next = *tp; | |
153 | write_lock_bh(&ipip6_lock); | |
154 | *tp = t; | |
155 | write_unlock_bh(&ipip6_lock); | |
156 | } | |
157 | ||
ca8def14 PE |
158 | static struct ip_tunnel * ipip6_tunnel_locate(struct net *net, |
159 | struct ip_tunnel_parm *parms, int create) | |
1da177e4 | 160 | { |
e69a4adc AV |
161 | __be32 remote = parms->iph.daddr; |
162 | __be32 local = parms->iph.saddr; | |
1da177e4 LT |
163 | struct ip_tunnel *t, **tp, *nt; |
164 | struct net_device *dev; | |
1da177e4 | 165 | char name[IFNAMSIZ]; |
ca8def14 | 166 | struct sit_net *sitn = net_generic(net, sit_net_id); |
1da177e4 | 167 | |
ca8def14 | 168 | for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) { |
1da177e4 LT |
169 | if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr) |
170 | return t; | |
171 | } | |
172 | if (!create) | |
173 | goto failed; | |
174 | ||
175 | if (parms->name[0]) | |
176 | strlcpy(name, parms->name, IFNAMSIZ); | |
34cc7ba6 PE |
177 | else |
178 | sprintf(name, "sit%%d"); | |
1da177e4 LT |
179 | |
180 | dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); | |
181 | if (dev == NULL) | |
182 | return NULL; | |
183 | ||
b37d428b PE |
184 | if (strchr(name, '%')) { |
185 | if (dev_alloc_name(dev, name) < 0) | |
186 | goto failed_free; | |
187 | } | |
188 | ||
2941a486 | 189 | nt = netdev_priv(dev); |
1da177e4 LT |
190 | dev->init = ipip6_tunnel_init; |
191 | nt->parms = *parms; | |
192 | ||
c7dc89c0 FT |
193 | if (parms->i_flags & SIT_ISATAP) |
194 | dev->priv_flags |= IFF_ISATAP; | |
195 | ||
b37d428b PE |
196 | if (register_netdevice(dev) < 0) |
197 | goto failed_free; | |
1da177e4 LT |
198 | |
199 | dev_hold(dev); | |
200 | ||
ca8def14 | 201 | ipip6_tunnel_link(sitn, nt); |
1da177e4 LT |
202 | return nt; |
203 | ||
b37d428b PE |
204 | failed_free: |
205 | free_netdev(dev); | |
1da177e4 LT |
206 | failed: |
207 | return NULL; | |
208 | } | |
209 | ||
fadf6bf0 | 210 | static struct ip_tunnel_prl_entry * |
3fcfa129 | 211 | __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) |
fadf6bf0 TF |
212 | { |
213 | struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *)NULL; | |
214 | ||
215 | for (p = t->prl; p; p = p->next) | |
300aaeea | 216 | if (p->addr == addr) |
fadf6bf0 TF |
217 | break; |
218 | return p; | |
219 | ||
220 | } | |
221 | ||
300aaeea YH |
222 | static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) |
223 | { | |
224 | struct ip_tunnel_prl *kp; | |
225 | struct ip_tunnel_prl_entry *prl; | |
226 | unsigned int cmax, c = 0, ca, len; | |
227 | int ret = 0; | |
228 | ||
229 | cmax = a->datalen / sizeof(*a); | |
230 | if (cmax > 1 && a->addr != htonl(INADDR_ANY)) | |
231 | cmax = 1; | |
232 | ||
233 | /* For simple GET or for root users, | |
234 | * we try harder to allocate. | |
235 | */ | |
236 | kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? | |
237 | kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : | |
238 | NULL; | |
239 | ||
240 | read_lock(&ipip6_lock); | |
241 | ||
242 | ca = t->prl_count < cmax ? t->prl_count : cmax; | |
243 | ||
244 | if (!kp) { | |
245 | /* We don't try hard to allocate much memory for | |
246 | * non-root users. | |
247 | * For root users, retry allocating enough memory for | |
248 | * the answer. | |
249 | */ | |
250 | kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); | |
251 | if (!kp) { | |
252 | ret = -ENOMEM; | |
253 | goto out; | |
254 | } | |
255 | } | |
256 | ||
257 | c = 0; | |
258 | for (prl = t->prl; prl; prl = prl->next) { | |
259 | if (c > cmax) | |
260 | break; | |
261 | if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr) | |
262 | continue; | |
263 | kp[c].addr = prl->addr; | |
264 | kp[c].flags = prl->flags; | |
265 | c++; | |
266 | if (a->addr != htonl(INADDR_ANY)) | |
267 | break; | |
268 | } | |
269 | out: | |
270 | read_unlock(&ipip6_lock); | |
271 | ||
272 | len = sizeof(*kp) * c; | |
273 | ret = len ? copy_to_user(a->data, kp, len) : 0; | |
274 | ||
275 | kfree(kp); | |
276 | if (ret) | |
277 | return -EFAULT; | |
278 | ||
279 | a->datalen = len; | |
280 | return 0; | |
281 | } | |
282 | ||
fadf6bf0 TF |
283 | static int |
284 | ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) | |
285 | { | |
286 | struct ip_tunnel_prl_entry *p; | |
3fcfa129 YH |
287 | int err = 0; |
288 | ||
0009ae1f YH |
289 | if (a->addr == htonl(INADDR_ANY)) |
290 | return -EINVAL; | |
291 | ||
3fcfa129 | 292 | write_lock(&ipip6_lock); |
fadf6bf0 TF |
293 | |
294 | for (p = t->prl; p; p = p->next) { | |
300aaeea | 295 | if (p->addr == a->addr) { |
3fcfa129 YH |
296 | if (chg) |
297 | goto update; | |
298 | err = -EEXIST; | |
299 | goto out; | |
fadf6bf0 TF |
300 | } |
301 | } | |
302 | ||
3fcfa129 YH |
303 | if (chg) { |
304 | err = -ENXIO; | |
305 | goto out; | |
306 | } | |
fadf6bf0 TF |
307 | |
308 | p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); | |
3fcfa129 YH |
309 | if (!p) { |
310 | err = -ENOBUFS; | |
311 | goto out; | |
312 | } | |
fadf6bf0 | 313 | |
fadf6bf0 TF |
314 | p->next = t->prl; |
315 | t->prl = p; | |
300aaeea | 316 | t->prl_count++; |
3fcfa129 | 317 | update: |
300aaeea YH |
318 | p->addr = a->addr; |
319 | p->flags = a->flags; | |
3fcfa129 YH |
320 | out: |
321 | write_unlock(&ipip6_lock); | |
322 | return err; | |
fadf6bf0 TF |
323 | } |
324 | ||
325 | static int | |
326 | ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) | |
327 | { | |
328 | struct ip_tunnel_prl_entry *x, **p; | |
3fcfa129 YH |
329 | int err = 0; |
330 | ||
331 | write_lock(&ipip6_lock); | |
fadf6bf0 | 332 | |
0009ae1f | 333 | if (a && a->addr != htonl(INADDR_ANY)) { |
fadf6bf0 | 334 | for (p = &t->prl; *p; p = &(*p)->next) { |
300aaeea | 335 | if ((*p)->addr == a->addr) { |
fadf6bf0 TF |
336 | x = *p; |
337 | *p = x->next; | |
338 | kfree(x); | |
300aaeea | 339 | t->prl_count--; |
3fcfa129 | 340 | goto out; |
fadf6bf0 TF |
341 | } |
342 | } | |
3fcfa129 | 343 | err = -ENXIO; |
fadf6bf0 TF |
344 | } else { |
345 | while (t->prl) { | |
346 | x = t->prl; | |
347 | t->prl = t->prl->next; | |
348 | kfree(x); | |
300aaeea | 349 | t->prl_count--; |
fadf6bf0 TF |
350 | } |
351 | } | |
3fcfa129 YH |
352 | out: |
353 | write_unlock(&ipip6_lock); | |
fadf6bf0 TF |
354 | return 0; |
355 | } | |
356 | ||
fadf6bf0 TF |
357 | static int |
358 | isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t) | |
359 | { | |
3fcfa129 | 360 | struct ip_tunnel_prl_entry *p; |
fadf6bf0 TF |
361 | int ok = 1; |
362 | ||
3fcfa129 YH |
363 | read_lock(&ipip6_lock); |
364 | p = __ipip6_tunnel_locate_prl(t, iph->saddr); | |
fadf6bf0 | 365 | if (p) { |
300aaeea | 366 | if (p->flags & PRL_DEFAULT) |
fadf6bf0 TF |
367 | skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; |
368 | else | |
369 | skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; | |
370 | } else { | |
371 | struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; | |
372 | if (ipv6_addr_is_isatap(addr6) && | |
373 | (addr6->s6_addr32[3] == iph->saddr) && | |
52eeeb84 | 374 | ipv6_chk_prefix(addr6, t->dev)) |
fadf6bf0 TF |
375 | skb->ndisc_nodetype = NDISC_NODETYPE_HOST; |
376 | else | |
377 | ok = 0; | |
378 | } | |
3fcfa129 | 379 | read_unlock(&ipip6_lock); |
fadf6bf0 TF |
380 | return ok; |
381 | } | |
382 | ||
1da177e4 LT |
383 | static void ipip6_tunnel_uninit(struct net_device *dev) |
384 | { | |
ca8def14 PE |
385 | struct net *net = dev_net(dev); |
386 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
387 | ||
cd3dbc19 | 388 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
389 | write_lock_bh(&ipip6_lock); |
390 | tunnels_wc[0] = NULL; | |
391 | write_unlock_bh(&ipip6_lock); | |
392 | dev_put(dev); | |
393 | } else { | |
ca8def14 | 394 | ipip6_tunnel_unlink(sitn, netdev_priv(dev)); |
02e10b90 | 395 | ipip6_tunnel_del_prl(netdev_priv(dev), NULL); |
1da177e4 LT |
396 | dev_put(dev); |
397 | } | |
398 | } | |
399 | ||
400 | ||
c73cb5a2 | 401 | static int ipip6_err(struct sk_buff *skb, u32 info) |
1da177e4 LT |
402 | { |
403 | #ifndef I_WISH_WORLD_WERE_PERFECT | |
404 | ||
405 | /* It is not :-( All the routers (except for Linux) return only | |
406 | 8 bytes of packet payload. It means, that precise relaying of | |
407 | ICMP in the real Internet is absolutely infeasible. | |
408 | */ | |
409 | struct iphdr *iph = (struct iphdr*)skb->data; | |
88c7664f ACM |
410 | const int type = icmp_hdr(skb)->type; |
411 | const int code = icmp_hdr(skb)->code; | |
1da177e4 | 412 | struct ip_tunnel *t; |
c73cb5a2 | 413 | int err; |
1da177e4 LT |
414 | |
415 | switch (type) { | |
416 | default: | |
417 | case ICMP_PARAMETERPROB: | |
c73cb5a2 | 418 | return 0; |
1da177e4 LT |
419 | |
420 | case ICMP_DEST_UNREACH: | |
421 | switch (code) { | |
422 | case ICMP_SR_FAILED: | |
423 | case ICMP_PORT_UNREACH: | |
424 | /* Impossible event. */ | |
c73cb5a2 | 425 | return 0; |
1da177e4 LT |
426 | case ICMP_FRAG_NEEDED: |
427 | /* Soft state for pmtu is maintained by IP core. */ | |
c73cb5a2 | 428 | return 0; |
1da177e4 LT |
429 | default: |
430 | /* All others are translated to HOST_UNREACH. | |
431 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
432 | I believe they are just ether pollution. --ANK | |
433 | */ | |
434 | break; | |
435 | } | |
436 | break; | |
437 | case ICMP_TIME_EXCEEDED: | |
438 | if (code != ICMP_EXC_TTL) | |
c73cb5a2 | 439 | return 0; |
1da177e4 LT |
440 | break; |
441 | } | |
442 | ||
c73cb5a2 KM |
443 | err = -ENOENT; |
444 | ||
1da177e4 | 445 | read_lock(&ipip6_lock); |
fcee5ec9 | 446 | t = ipip6_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr); |
1da177e4 LT |
447 | if (t == NULL || t->parms.iph.daddr == 0) |
448 | goto out; | |
c73cb5a2 KM |
449 | |
450 | err = 0; | |
1da177e4 LT |
451 | if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) |
452 | goto out; | |
453 | ||
454 | if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO) | |
455 | t->err_count++; | |
456 | else | |
457 | t->err_count = 1; | |
458 | t->err_time = jiffies; | |
459 | out: | |
460 | read_unlock(&ipip6_lock); | |
c73cb5a2 | 461 | return err; |
1da177e4 LT |
462 | #else |
463 | struct iphdr *iph = (struct iphdr*)dp; | |
464 | int hlen = iph->ihl<<2; | |
465 | struct ipv6hdr *iph6; | |
88c7664f ACM |
466 | const int type = icmp_hdr(skb)->type; |
467 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
468 | int rel_type = 0; |
469 | int rel_code = 0; | |
470 | int rel_info = 0; | |
471 | struct sk_buff *skb2; | |
472 | struct rt6_info *rt6i; | |
473 | ||
474 | if (len < hlen + sizeof(struct ipv6hdr)) | |
475 | return; | |
476 | iph6 = (struct ipv6hdr*)(dp + hlen); | |
477 | ||
478 | switch (type) { | |
479 | default: | |
480 | return; | |
481 | case ICMP_PARAMETERPROB: | |
88c7664f | 482 | if (icmp_hdr(skb)->un.gateway < hlen) |
1da177e4 LT |
483 | return; |
484 | ||
485 | /* So... This guy found something strange INSIDE encapsulated | |
486 | packet. Well, he is fool, but what can we do ? | |
487 | */ | |
488 | rel_type = ICMPV6_PARAMPROB; | |
88c7664f | 489 | rel_info = icmp_hdr(skb)->un.gateway - hlen; |
1da177e4 LT |
490 | break; |
491 | ||
492 | case ICMP_DEST_UNREACH: | |
493 | switch (code) { | |
494 | case ICMP_SR_FAILED: | |
495 | case ICMP_PORT_UNREACH: | |
496 | /* Impossible event. */ | |
497 | return; | |
498 | case ICMP_FRAG_NEEDED: | |
499 | /* Too complicated case ... */ | |
500 | return; | |
501 | default: | |
502 | /* All others are translated to HOST_UNREACH. | |
503 | rfc2003 contains "deep thoughts" about NET_UNREACH, | |
504 | I believe, it is just ether pollution. --ANK | |
505 | */ | |
506 | rel_type = ICMPV6_DEST_UNREACH; | |
507 | rel_code = ICMPV6_ADDR_UNREACH; | |
508 | break; | |
509 | } | |
510 | break; | |
511 | case ICMP_TIME_EXCEEDED: | |
512 | if (code != ICMP_EXC_TTL) | |
513 | return; | |
514 | rel_type = ICMPV6_TIME_EXCEED; | |
515 | rel_code = ICMPV6_EXC_HOPLIMIT; | |
516 | break; | |
517 | } | |
518 | ||
519 | /* Prepare fake skb to feed it to icmpv6_send */ | |
520 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
521 | if (skb2 == NULL) | |
c73cb5a2 | 522 | return 0; |
1da177e4 LT |
523 | dst_release(skb2->dst); |
524 | skb2->dst = NULL; | |
525 | skb_pull(skb2, skb->data - (u8*)iph6); | |
c1d2bbe1 | 526 | skb_reset_network_header(skb2); |
1da177e4 LT |
527 | |
528 | /* Try to guess incoming interface */ | |
606a2b48 | 529 | rt6i = rt6_lookup(&init_net, &iph6->saddr, NULL, NULL, 0); |
1da177e4 LT |
530 | if (rt6i && rt6i->rt6i_dev) { |
531 | skb2->dev = rt6i->rt6i_dev; | |
532 | ||
606a2b48 | 533 | rt6i = rt6_lookup(&init_net, &iph6->daddr, &iph6->saddr, NULL, 0); |
1da177e4 LT |
534 | |
535 | if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) { | |
2941a486 | 536 | struct ip_tunnel *t = netdev_priv(rt6i->rt6i_dev); |
1da177e4 LT |
537 | if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) { |
538 | rel_type = ICMPV6_DEST_UNREACH; | |
539 | rel_code = ICMPV6_ADDR_UNREACH; | |
540 | } | |
541 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
542 | } | |
543 | } | |
544 | kfree_skb(skb2); | |
c73cb5a2 | 545 | return 0; |
1da177e4 LT |
546 | #endif |
547 | } | |
548 | ||
549 | static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb) | |
550 | { | |
551 | if (INET_ECN_is_ce(iph->tos)) | |
0660e03f | 552 | IP6_ECN_set_ce(ipv6_hdr(skb)); |
1da177e4 LT |
553 | } |
554 | ||
555 | static int ipip6_rcv(struct sk_buff *skb) | |
556 | { | |
557 | struct iphdr *iph; | |
558 | struct ip_tunnel *tunnel; | |
559 | ||
560 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
561 | goto out; | |
562 | ||
eddc9ec5 | 563 | iph = ip_hdr(skb); |
1da177e4 LT |
564 | |
565 | read_lock(&ipip6_lock); | |
fcee5ec9 | 566 | if ((tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), |
ca8def14 | 567 | iph->saddr, iph->daddr)) != NULL) { |
1da177e4 | 568 | secpath_reset(skb); |
b0e380b1 | 569 | skb->mac_header = skb->network_header; |
c1d2bbe1 | 570 | skb_reset_network_header(skb); |
8cdfab8a | 571 | IPCB(skb)->flags = 0; |
1da177e4 LT |
572 | skb->protocol = htons(ETH_P_IPV6); |
573 | skb->pkt_type = PACKET_HOST; | |
c7dc89c0 FT |
574 | |
575 | if ((tunnel->dev->priv_flags & IFF_ISATAP) && | |
fadf6bf0 | 576 | !isatap_chksrc(skb, iph, tunnel)) { |
c7dc89c0 FT |
577 | tunnel->stat.rx_errors++; |
578 | read_unlock(&ipip6_lock); | |
579 | kfree_skb(skb); | |
580 | return 0; | |
581 | } | |
1da177e4 LT |
582 | tunnel->stat.rx_packets++; |
583 | tunnel->stat.rx_bytes += skb->len; | |
584 | skb->dev = tunnel->dev; | |
585 | dst_release(skb->dst); | |
586 | skb->dst = NULL; | |
587 | nf_reset(skb); | |
588 | ipip6_ecn_decapsulate(iph, skb); | |
589 | netif_rx(skb); | |
590 | read_unlock(&ipip6_lock); | |
591 | return 0; | |
592 | } | |
593 | ||
45af08be | 594 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1da177e4 LT |
595 | kfree_skb(skb); |
596 | read_unlock(&ipip6_lock); | |
597 | out: | |
598 | return 0; | |
599 | } | |
600 | ||
601 | /* Returns the embedded IPv4 address if the IPv6 address | |
602 | comes from 6to4 (RFC 3056) addr space */ | |
603 | ||
e69a4adc | 604 | static inline __be32 try_6to4(struct in6_addr *v6dst) |
1da177e4 | 605 | { |
e69a4adc | 606 | __be32 dst = 0; |
1da177e4 LT |
607 | |
608 | if (v6dst->s6_addr16[0] == htons(0x2002)) { | |
1ab1457c | 609 | /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ |
1da177e4 LT |
610 | memcpy(&dst, &v6dst->s6_addr16[1], 4); |
611 | } | |
612 | return dst; | |
613 | } | |
614 | ||
615 | /* | |
616 | * This function assumes it is being called from dev_queue_xmit() | |
617 | * and that skb is filled properly by that function. | |
618 | */ | |
619 | ||
620 | static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) | |
621 | { | |
2941a486 | 622 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
623 | struct net_device_stats *stats = &tunnel->stat; |
624 | struct iphdr *tiph = &tunnel->parms.iph; | |
0660e03f | 625 | struct ipv6hdr *iph6 = ipv6_hdr(skb); |
1da177e4 LT |
626 | u8 tos = tunnel->parms.iph.tos; |
627 | struct rtable *rt; /* Route to the other host */ | |
628 | struct net_device *tdev; /* Device to other host */ | |
629 | struct iphdr *iph; /* Our new IP header */ | |
c2636b4d | 630 | unsigned int max_headroom; /* The extra header space needed */ |
e69a4adc | 631 | __be32 dst = tiph->daddr; |
1da177e4 | 632 | int mtu; |
1ab1457c | 633 | struct in6_addr *addr6; |
1da177e4 LT |
634 | int addr_type; |
635 | ||
636 | if (tunnel->recursion++) { | |
637 | tunnel->stat.collisions++; | |
638 | goto tx_error; | |
639 | } | |
640 | ||
641 | if (skb->protocol != htons(ETH_P_IPV6)) | |
642 | goto tx_error; | |
643 | ||
c7dc89c0 FT |
644 | /* ISATAP (RFC4214) - must come before 6to4 */ |
645 | if (dev->priv_flags & IFF_ISATAP) { | |
646 | struct neighbour *neigh = NULL; | |
647 | ||
648 | if (skb->dst) | |
649 | neigh = skb->dst->neighbour; | |
650 | ||
651 | if (neigh == NULL) { | |
652 | if (net_ratelimit()) | |
653 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
654 | goto tx_error; | |
655 | } | |
656 | ||
657 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
658 | addr_type = ipv6_addr_type(addr6); | |
659 | ||
660 | if ((addr_type & IPV6_ADDR_UNICAST) && | |
661 | ipv6_addr_is_isatap(addr6)) | |
662 | dst = addr6->s6_addr32[3]; | |
663 | else | |
664 | goto tx_error; | |
665 | } | |
666 | ||
1da177e4 LT |
667 | if (!dst) |
668 | dst = try_6to4(&iph6->daddr); | |
669 | ||
670 | if (!dst) { | |
671 | struct neighbour *neigh = NULL; | |
672 | ||
673 | if (skb->dst) | |
674 | neigh = skb->dst->neighbour; | |
675 | ||
676 | if (neigh == NULL) { | |
677 | if (net_ratelimit()) | |
678 | printk(KERN_DEBUG "sit: nexthop == NULL\n"); | |
679 | goto tx_error; | |
680 | } | |
681 | ||
682 | addr6 = (struct in6_addr*)&neigh->primary_key; | |
683 | addr_type = ipv6_addr_type(addr6); | |
684 | ||
685 | if (addr_type == IPV6_ADDR_ANY) { | |
0660e03f | 686 | addr6 = &ipv6_hdr(skb)->daddr; |
1da177e4 LT |
687 | addr_type = ipv6_addr_type(addr6); |
688 | } | |
689 | ||
690 | if ((addr_type & IPV6_ADDR_COMPATv4) == 0) | |
691 | goto tx_error_icmp; | |
692 | ||
693 | dst = addr6->s6_addr32[3]; | |
694 | } | |
695 | ||
696 | { | |
697 | struct flowi fl = { .nl_u = { .ip4_u = | |
698 | { .daddr = dst, | |
699 | .saddr = tiph->saddr, | |
700 | .tos = RT_TOS(tos) } }, | |
701 | .oif = tunnel->parms.link, | |
702 | .proto = IPPROTO_IPV6 }; | |
f206351a | 703 | if (ip_route_output_key(&init_net, &rt, &fl)) { |
1da177e4 LT |
704 | tunnel->stat.tx_carrier_errors++; |
705 | goto tx_error_icmp; | |
706 | } | |
707 | } | |
708 | if (rt->rt_type != RTN_UNICAST) { | |
709 | ip_rt_put(rt); | |
710 | tunnel->stat.tx_carrier_errors++; | |
711 | goto tx_error_icmp; | |
712 | } | |
713 | tdev = rt->u.dst.dev; | |
714 | ||
715 | if (tdev == dev) { | |
716 | ip_rt_put(rt); | |
717 | tunnel->stat.collisions++; | |
718 | goto tx_error; | |
719 | } | |
720 | ||
721 | if (tiph->frag_off) | |
722 | mtu = dst_mtu(&rt->u.dst) - sizeof(struct iphdr); | |
723 | else | |
724 | mtu = skb->dst ? dst_mtu(skb->dst) : dev->mtu; | |
725 | ||
726 | if (mtu < 68) { | |
727 | tunnel->stat.collisions++; | |
728 | ip_rt_put(rt); | |
729 | goto tx_error; | |
730 | } | |
731 | if (mtu < IPV6_MIN_MTU) | |
732 | mtu = IPV6_MIN_MTU; | |
733 | if (tunnel->parms.iph.daddr && skb->dst) | |
734 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
735 | ||
736 | if (skb->len > mtu) { | |
737 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
738 | ip_rt_put(rt); | |
739 | goto tx_error; | |
740 | } | |
741 | ||
742 | if (tunnel->err_count > 0) { | |
743 | if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) { | |
744 | tunnel->err_count--; | |
745 | dst_link_failure(skb); | |
746 | } else | |
747 | tunnel->err_count = 0; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Okay, now see if we can stuff it in the buffer as-is. | |
752 | */ | |
753 | max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); | |
754 | ||
cfbba49d PM |
755 | if (skb_headroom(skb) < max_headroom || skb_shared(skb) || |
756 | (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { | |
1da177e4 LT |
757 | struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); |
758 | if (!new_skb) { | |
759 | ip_rt_put(rt); | |
1ab1457c | 760 | stats->tx_dropped++; |
1da177e4 LT |
761 | dev_kfree_skb(skb); |
762 | tunnel->recursion--; | |
763 | return 0; | |
764 | } | |
765 | if (skb->sk) | |
766 | skb_set_owner_w(new_skb, skb->sk); | |
767 | dev_kfree_skb(skb); | |
768 | skb = new_skb; | |
0660e03f | 769 | iph6 = ipv6_hdr(skb); |
1da177e4 LT |
770 | } |
771 | ||
b0e380b1 | 772 | skb->transport_header = skb->network_header; |
e2d1bca7 ACM |
773 | skb_push(skb, sizeof(struct iphdr)); |
774 | skb_reset_network_header(skb); | |
1da177e4 | 775 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
8cdfab8a | 776 | IPCB(skb)->flags = 0; |
1da177e4 LT |
777 | dst_release(skb->dst); |
778 | skb->dst = &rt->u.dst; | |
779 | ||
780 | /* | |
781 | * Push down and install the IPIP header. | |
782 | */ | |
783 | ||
eddc9ec5 | 784 | iph = ip_hdr(skb); |
1da177e4 LT |
785 | iph->version = 4; |
786 | iph->ihl = sizeof(struct iphdr)>>2; | |
787 | if (mtu > IPV6_MIN_MTU) | |
788 | iph->frag_off = htons(IP_DF); | |
789 | else | |
790 | iph->frag_off = 0; | |
791 | ||
792 | iph->protocol = IPPROTO_IPV6; | |
793 | iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); | |
794 | iph->daddr = rt->rt_dst; | |
795 | iph->saddr = rt->rt_src; | |
796 | ||
797 | if ((iph->ttl = tiph->ttl) == 0) | |
798 | iph->ttl = iph6->hop_limit; | |
799 | ||
800 | nf_reset(skb); | |
801 | ||
802 | IPTUNNEL_XMIT(); | |
803 | tunnel->recursion--; | |
804 | return 0; | |
805 | ||
806 | tx_error_icmp: | |
807 | dst_link_failure(skb); | |
808 | tx_error: | |
809 | stats->tx_errors++; | |
810 | dev_kfree_skb(skb); | |
811 | tunnel->recursion--; | |
812 | return 0; | |
813 | } | |
814 | ||
8a4a50f9 MS |
815 | static void ipip6_tunnel_bind_dev(struct net_device *dev) |
816 | { | |
817 | struct net_device *tdev = NULL; | |
818 | struct ip_tunnel *tunnel; | |
819 | struct iphdr *iph; | |
820 | ||
821 | tunnel = netdev_priv(dev); | |
822 | iph = &tunnel->parms.iph; | |
823 | ||
824 | if (iph->daddr) { | |
825 | struct flowi fl = { .nl_u = { .ip4_u = | |
826 | { .daddr = iph->daddr, | |
827 | .saddr = iph->saddr, | |
828 | .tos = RT_TOS(iph->tos) } }, | |
829 | .oif = tunnel->parms.link, | |
830 | .proto = IPPROTO_IPV6 }; | |
831 | struct rtable *rt; | |
f206351a | 832 | if (!ip_route_output_key(&init_net, &rt, &fl)) { |
8a4a50f9 MS |
833 | tdev = rt->u.dst.dev; |
834 | ip_rt_put(rt); | |
835 | } | |
836 | dev->flags |= IFF_POINTOPOINT; | |
837 | } | |
838 | ||
839 | if (!tdev && tunnel->parms.link) | |
840 | tdev = __dev_get_by_index(&init_net, tunnel->parms.link); | |
841 | ||
842 | if (tdev) { | |
843 | dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); | |
844 | dev->mtu = tdev->mtu - sizeof(struct iphdr); | |
845 | if (dev->mtu < IPV6_MIN_MTU) | |
846 | dev->mtu = IPV6_MIN_MTU; | |
847 | } | |
848 | dev->iflink = tunnel->parms.link; | |
849 | } | |
850 | ||
1da177e4 LT |
851 | static int |
852 | ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) | |
853 | { | |
854 | int err = 0; | |
855 | struct ip_tunnel_parm p; | |
fadf6bf0 | 856 | struct ip_tunnel_prl prl; |
1da177e4 | 857 | struct ip_tunnel *t; |
ca8def14 PE |
858 | struct net *net = dev_net(dev); |
859 | struct sit_net *sitn = net_generic(net, sit_net_id); | |
1da177e4 LT |
860 | |
861 | switch (cmd) { | |
862 | case SIOCGETTUNNEL: | |
863 | t = NULL; | |
cd3dbc19 | 864 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
865 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { |
866 | err = -EFAULT; | |
867 | break; | |
868 | } | |
ca8def14 | 869 | t = ipip6_tunnel_locate(net, &p, 0); |
1da177e4 LT |
870 | } |
871 | if (t == NULL) | |
2941a486 | 872 | t = netdev_priv(dev); |
1da177e4 LT |
873 | memcpy(&p, &t->parms, sizeof(p)); |
874 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) | |
875 | err = -EFAULT; | |
876 | break; | |
877 | ||
878 | case SIOCADDTUNNEL: | |
879 | case SIOCCHGTUNNEL: | |
880 | err = -EPERM; | |
881 | if (!capable(CAP_NET_ADMIN)) | |
882 | goto done; | |
883 | ||
884 | err = -EFAULT; | |
885 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
886 | goto done; | |
887 | ||
888 | err = -EINVAL; | |
889 | if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || | |
890 | p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) | |
891 | goto done; | |
892 | if (p.iph.ttl) | |
893 | p.iph.frag_off |= htons(IP_DF); | |
894 | ||
ca8def14 | 895 | t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); |
1da177e4 | 896 | |
cd3dbc19 | 897 | if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { |
1da177e4 LT |
898 | if (t != NULL) { |
899 | if (t->dev != dev) { | |
900 | err = -EEXIST; | |
901 | break; | |
902 | } | |
903 | } else { | |
904 | if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || | |
905 | (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { | |
906 | err = -EINVAL; | |
907 | break; | |
908 | } | |
2941a486 | 909 | t = netdev_priv(dev); |
ca8def14 | 910 | ipip6_tunnel_unlink(sitn, t); |
1da177e4 LT |
911 | t->parms.iph.saddr = p.iph.saddr; |
912 | t->parms.iph.daddr = p.iph.daddr; | |
913 | memcpy(dev->dev_addr, &p.iph.saddr, 4); | |
914 | memcpy(dev->broadcast, &p.iph.daddr, 4); | |
ca8def14 | 915 | ipip6_tunnel_link(sitn, t); |
1da177e4 LT |
916 | netdev_state_change(dev); |
917 | } | |
918 | } | |
919 | ||
920 | if (t) { | |
921 | err = 0; | |
922 | if (cmd == SIOCCHGTUNNEL) { | |
923 | t->parms.iph.ttl = p.iph.ttl; | |
924 | t->parms.iph.tos = p.iph.tos; | |
8a4a50f9 MS |
925 | if (t->parms.link != p.link) { |
926 | t->parms.link = p.link; | |
927 | ipip6_tunnel_bind_dev(dev); | |
928 | netdev_state_change(dev); | |
929 | } | |
1da177e4 LT |
930 | } |
931 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) | |
932 | err = -EFAULT; | |
933 | } else | |
934 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
935 | break; | |
936 | ||
937 | case SIOCDELTUNNEL: | |
938 | err = -EPERM; | |
939 | if (!capable(CAP_NET_ADMIN)) | |
940 | goto done; | |
941 | ||
cd3dbc19 | 942 | if (dev == sitn->fb_tunnel_dev) { |
1da177e4 LT |
943 | err = -EFAULT; |
944 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) | |
945 | goto done; | |
946 | err = -ENOENT; | |
ca8def14 | 947 | if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) |
1da177e4 LT |
948 | goto done; |
949 | err = -EPERM; | |
cd3dbc19 | 950 | if (t == netdev_priv(sitn->fb_tunnel_dev)) |
1da177e4 LT |
951 | goto done; |
952 | dev = t->dev; | |
953 | } | |
22f8cde5 SH |
954 | unregister_netdevice(dev); |
955 | err = 0; | |
1da177e4 LT |
956 | break; |
957 | ||
300aaeea | 958 | case SIOCGETPRL: |
fadf6bf0 TF |
959 | case SIOCADDPRL: |
960 | case SIOCDELPRL: | |
961 | case SIOCCHGPRL: | |
962 | err = -EPERM; | |
300aaeea | 963 | if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN)) |
fadf6bf0 TF |
964 | goto done; |
965 | err = -EINVAL; | |
cd3dbc19 | 966 | if (dev == sitn->fb_tunnel_dev) |
fadf6bf0 TF |
967 | goto done; |
968 | err = -EFAULT; | |
969 | if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) | |
970 | goto done; | |
971 | err = -ENOENT; | |
972 | if (!(t = netdev_priv(dev))) | |
973 | goto done; | |
974 | ||
300aaeea YH |
975 | switch (cmd) { |
976 | case SIOCGETPRL: | |
977 | err = ipip6_tunnel_get_prl(t, &prl); | |
978 | if (!err && copy_to_user(ifr->ifr_ifru.ifru_data, | |
979 | &prl, sizeof(prl))) | |
980 | err = -EFAULT; | |
981 | break; | |
982 | case SIOCDELPRL: | |
fadf6bf0 | 983 | err = ipip6_tunnel_del_prl(t, &prl); |
300aaeea YH |
984 | break; |
985 | case SIOCADDPRL: | |
986 | case SIOCCHGPRL: | |
fadf6bf0 | 987 | err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); |
300aaeea YH |
988 | break; |
989 | } | |
990 | if (cmd != SIOCGETPRL) | |
991 | netdev_state_change(dev); | |
fadf6bf0 TF |
992 | break; |
993 | ||
1da177e4 LT |
994 | default: |
995 | err = -EINVAL; | |
996 | } | |
997 | ||
998 | done: | |
999 | return err; | |
1000 | } | |
1001 | ||
1002 | static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev) | |
1003 | { | |
2941a486 | 1004 | return &(((struct ip_tunnel*)netdev_priv(dev))->stat); |
1da177e4 LT |
1005 | } |
1006 | ||
1007 | static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) | |
1008 | { | |
1009 | if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) | |
1010 | return -EINVAL; | |
1011 | dev->mtu = new_mtu; | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static void ipip6_tunnel_setup(struct net_device *dev) | |
1016 | { | |
1da177e4 LT |
1017 | dev->uninit = ipip6_tunnel_uninit; |
1018 | dev->destructor = free_netdev; | |
1019 | dev->hard_start_xmit = ipip6_tunnel_xmit; | |
1020 | dev->get_stats = ipip6_tunnel_get_stats; | |
1021 | dev->do_ioctl = ipip6_tunnel_ioctl; | |
1022 | dev->change_mtu = ipip6_tunnel_change_mtu; | |
1023 | ||
1024 | dev->type = ARPHRD_SIT; | |
1025 | dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); | |
46f25dff | 1026 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); |
1da177e4 LT |
1027 | dev->flags = IFF_NOARP; |
1028 | dev->iflink = 0; | |
1029 | dev->addr_len = 4; | |
1030 | } | |
1031 | ||
1032 | static int ipip6_tunnel_init(struct net_device *dev) | |
1033 | { | |
1da177e4 | 1034 | struct ip_tunnel *tunnel; |
1da177e4 | 1035 | |
2941a486 | 1036 | tunnel = netdev_priv(dev); |
1da177e4 LT |
1037 | |
1038 | tunnel->dev = dev; | |
1039 | strcpy(tunnel->parms.name, dev->name); | |
1040 | ||
1041 | memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); | |
1042 | memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); | |
1043 | ||
8a4a50f9 | 1044 | ipip6_tunnel_bind_dev(dev); |
1da177e4 LT |
1045 | |
1046 | return 0; | |
1047 | } | |
1048 | ||
cd3dbc19 | 1049 | static int ipip6_fb_tunnel_init(struct net_device *dev) |
1da177e4 | 1050 | { |
2941a486 | 1051 | struct ip_tunnel *tunnel = netdev_priv(dev); |
1da177e4 LT |
1052 | struct iphdr *iph = &tunnel->parms.iph; |
1053 | ||
1054 | tunnel->dev = dev; | |
1055 | strcpy(tunnel->parms.name, dev->name); | |
1056 | ||
1057 | iph->version = 4; | |
1058 | iph->protocol = IPPROTO_IPV6; | |
1059 | iph->ihl = 5; | |
1060 | iph->ttl = 64; | |
1061 | ||
1062 | dev_hold(dev); | |
1063 | tunnels_wc[0] = tunnel; | |
1064 | return 0; | |
1065 | } | |
1066 | ||
c73cb5a2 | 1067 | static struct xfrm_tunnel sit_handler = { |
1da177e4 LT |
1068 | .handler = ipip6_rcv, |
1069 | .err_handler = ipip6_err, | |
c73cb5a2 | 1070 | .priority = 1, |
1da177e4 LT |
1071 | }; |
1072 | ||
db44575f AK |
1073 | static void __exit sit_destroy_tunnels(void) |
1074 | { | |
1075 | int prio; | |
1076 | ||
1077 | for (prio = 1; prio < 4; prio++) { | |
1078 | int h; | |
1079 | for (h = 0; h < HASH_SIZE; h++) { | |
1080 | struct ip_tunnel *t; | |
1081 | while ((t = tunnels[prio][h]) != NULL) | |
1082 | unregister_netdevice(t->dev); | |
1083 | } | |
1084 | } | |
1085 | } | |
1086 | ||
8190d900 PE |
1087 | static int sit_init_net(struct net *net) |
1088 | { | |
1089 | int err; | |
1090 | struct sit_net *sitn; | |
1091 | ||
1092 | err = -ENOMEM; | |
1093 | sitn = kmalloc(sizeof(struct sit_net), GFP_KERNEL); | |
1094 | if (sitn == NULL) | |
1095 | goto err_alloc; | |
1096 | ||
1097 | err = net_assign_generic(net, sit_net_id, sitn); | |
1098 | if (err < 0) | |
1099 | goto err_assign; | |
1100 | ||
cd3dbc19 PE |
1101 | sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", |
1102 | ipip6_tunnel_setup); | |
1103 | if (!sitn->fb_tunnel_dev) { | |
1104 | err = -ENOMEM; | |
1105 | goto err_alloc_dev; | |
1106 | } | |
1107 | ||
1108 | sitn->fb_tunnel_dev->init = ipip6_fb_tunnel_init; | |
1109 | dev_net_set(sitn->fb_tunnel_dev, net); | |
1110 | ||
1111 | if ((err = register_netdev(sitn->fb_tunnel_dev))) | |
1112 | goto err_reg_dev; | |
1113 | ||
8190d900 PE |
1114 | return 0; |
1115 | ||
cd3dbc19 PE |
1116 | err_reg_dev: |
1117 | free_netdev(sitn->fb_tunnel_dev); | |
1118 | err_alloc_dev: | |
1119 | /* nothing */ | |
8190d900 PE |
1120 | err_assign: |
1121 | kfree(sitn); | |
1122 | err_alloc: | |
1123 | return err; | |
1124 | } | |
1125 | ||
1126 | static void sit_exit_net(struct net *net) | |
1127 | { | |
1128 | struct sit_net *sitn; | |
1129 | ||
1130 | sitn = net_generic(net, sit_net_id); | |
cd3dbc19 PE |
1131 | rtnl_lock(); |
1132 | unregister_netdevice(sitn->fb_tunnel_dev); | |
1133 | rtnl_unlock(); | |
8190d900 PE |
1134 | kfree(sitn); |
1135 | } | |
1136 | ||
1137 | static struct pernet_operations sit_net_ops = { | |
1138 | .init = sit_init_net, | |
1139 | .exit = sit_exit_net, | |
1140 | }; | |
1141 | ||
89c89458 | 1142 | static void __exit sit_cleanup(void) |
1da177e4 | 1143 | { |
c73cb5a2 | 1144 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
db44575f AK |
1145 | |
1146 | rtnl_lock(); | |
1147 | sit_destroy_tunnels(); | |
db44575f | 1148 | rtnl_unlock(); |
8190d900 PE |
1149 | |
1150 | unregister_pernet_gen_device(sit_net_id, &sit_net_ops); | |
1da177e4 LT |
1151 | } |
1152 | ||
89c89458 | 1153 | static int __init sit_init(void) |
1da177e4 LT |
1154 | { |
1155 | int err; | |
1156 | ||
1157 | printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n"); | |
1158 | ||
c73cb5a2 | 1159 | if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) { |
1da177e4 LT |
1160 | printk(KERN_INFO "sit init: Can't add protocol\n"); |
1161 | return -EAGAIN; | |
1162 | } | |
1163 | ||
8190d900 PE |
1164 | err = register_pernet_gen_device(&sit_net_id, &sit_net_ops); |
1165 | if (err < 0) | |
cd3dbc19 | 1166 | xfrm4_tunnel_deregister(&sit_handler, AF_INET6); |
8190d900 | 1167 | |
1da177e4 | 1168 | return err; |
1da177e4 | 1169 | } |
989e5b96 JR |
1170 | |
1171 | module_init(sit_init); | |
1172 | module_exit(sit_cleanup); | |
39c85086 | 1173 | MODULE_LICENSE("GPL"); |
daccff02 | 1174 | MODULE_ALIAS("sit0"); |