Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv6 tunnel device | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> |
1da177e4 LT |
7 | * |
8 | * $Id$ | |
9 | * | |
10 | * Based on: | |
11 | * linux/net/ipv6/sit.c | |
12 | * | |
13 | * RFC 2473 | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
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/sockios.h> | |
27 | #include <linux/if.h> | |
28 | #include <linux/in.h> | |
29 | #include <linux/ip.h> | |
30 | #include <linux/if_tunnel.h> | |
31 | #include <linux/net.h> | |
32 | #include <linux/in6.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/if_arp.h> | |
35 | #include <linux/icmpv6.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/rtnetlink.h> | |
39 | #include <linux/netfilter_ipv6.h> | |
40 | ||
41 | #include <asm/uaccess.h> | |
42 | #include <asm/atomic.h> | |
43 | ||
44 | #include <net/ip.h> | |
45 | #include <net/ipv6.h> | |
1da177e4 LT |
46 | #include <net/ip6_route.h> |
47 | #include <net/addrconf.h> | |
48 | #include <net/ip6_tunnel.h> | |
49 | #include <net/xfrm.h> | |
50 | #include <net/dsfield.h> | |
51 | #include <net/inet_ecn.h> | |
52 | ||
53 | MODULE_AUTHOR("Ville Nuorvala"); | |
54 | MODULE_DESCRIPTION("IPv6-in-IPv6 tunnel"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | #define IPV6_TLV_TEL_DST_SIZE 8 | |
58 | ||
59 | #ifdef IP6_TNL_DEBUG | |
60 | #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __FUNCTION__) | |
61 | #else | |
62 | #define IP6_TNL_TRACE(x...) do {;} while(0) | |
63 | #endif | |
64 | ||
65 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) | |
66 | ||
67 | #define HASH_SIZE 32 | |
68 | ||
e69a4adc | 69 | #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ |
1ab1457c YH |
70 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
71 | (HASH_SIZE - 1)) | |
1da177e4 LT |
72 | |
73 | static int ip6ip6_fb_tnl_dev_init(struct net_device *dev); | |
74 | static int ip6ip6_tnl_dev_init(struct net_device *dev); | |
75 | static void ip6ip6_tnl_dev_setup(struct net_device *dev); | |
76 | ||
77 | /* the IPv6 tunnel fallback device */ | |
78 | static struct net_device *ip6ip6_fb_tnl_dev; | |
79 | ||
80 | ||
81 | /* lists for storing tunnels in use */ | |
82 | static struct ip6_tnl *tnls_r_l[HASH_SIZE]; | |
83 | static struct ip6_tnl *tnls_wc[1]; | |
84 | static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l }; | |
85 | ||
86 | /* lock for the tunnel lists */ | |
87 | static DEFINE_RWLOCK(ip6ip6_lock); | |
88 | ||
89 | static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) | |
90 | { | |
91 | struct dst_entry *dst = t->dst_cache; | |
92 | ||
1ab1457c | 93 | if (dst && dst->obsolete && |
1da177e4 LT |
94 | dst->ops->check(dst, t->dst_cookie) == NULL) { |
95 | t->dst_cache = NULL; | |
96 | dst_release(dst); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | return dst; | |
101 | } | |
102 | ||
103 | static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) | |
104 | { | |
105 | dst_release(t->dst_cache); | |
106 | t->dst_cache = NULL; | |
107 | } | |
108 | ||
109 | static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) | |
110 | { | |
111 | struct rt6_info *rt = (struct rt6_info *) dst; | |
112 | t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
113 | dst_release(t->dst_cache); | |
114 | t->dst_cache = dst; | |
115 | } | |
116 | ||
117 | /** | |
118 | * ip6ip6_tnl_lookup - fetch tunnel matching the end-point addresses | |
1ab1457c YH |
119 | * @remote: the address of the tunnel exit-point |
120 | * @local: the address of the tunnel entry-point | |
1da177e4 | 121 | * |
1ab1457c | 122 | * Return: |
1da177e4 | 123 | * tunnel matching given end-points if found, |
1ab1457c | 124 | * else fallback tunnel if its device is up, |
1da177e4 LT |
125 | * else %NULL |
126 | **/ | |
127 | ||
128 | static struct ip6_tnl * | |
129 | ip6ip6_tnl_lookup(struct in6_addr *remote, struct in6_addr *local) | |
130 | { | |
131 | unsigned h0 = HASH(remote); | |
132 | unsigned h1 = HASH(local); | |
133 | struct ip6_tnl *t; | |
134 | ||
135 | for (t = tnls_r_l[h0 ^ h1]; t; t = t->next) { | |
136 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
137 | ipv6_addr_equal(remote, &t->parms.raddr) && | |
138 | (t->dev->flags & IFF_UP)) | |
139 | return t; | |
140 | } | |
141 | if ((t = tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) | |
142 | return t; | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | /** | |
148 | * ip6ip6_bucket - get head of list matching given tunnel parameters | |
1ab1457c | 149 | * @p: parameters containing tunnel end-points |
1da177e4 LT |
150 | * |
151 | * Description: | |
1ab1457c | 152 | * ip6ip6_bucket() returns the head of the list matching the |
1da177e4 LT |
153 | * &struct in6_addr entries laddr and raddr in @p. |
154 | * | |
1ab1457c | 155 | * Return: head of IPv6 tunnel list |
1da177e4 LT |
156 | **/ |
157 | ||
158 | static struct ip6_tnl ** | |
159 | ip6ip6_bucket(struct ip6_tnl_parm *p) | |
160 | { | |
161 | struct in6_addr *remote = &p->raddr; | |
162 | struct in6_addr *local = &p->laddr; | |
163 | unsigned h = 0; | |
164 | int prio = 0; | |
165 | ||
166 | if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { | |
167 | prio = 1; | |
168 | h = HASH(remote) ^ HASH(local); | |
169 | } | |
170 | return &tnls[prio][h]; | |
171 | } | |
172 | ||
173 | /** | |
174 | * ip6ip6_tnl_link - add tunnel to hash table | |
175 | * @t: tunnel to be added | |
176 | **/ | |
177 | ||
178 | static void | |
179 | ip6ip6_tnl_link(struct ip6_tnl *t) | |
180 | { | |
181 | struct ip6_tnl **tp = ip6ip6_bucket(&t->parms); | |
182 | ||
183 | t->next = *tp; | |
184 | write_lock_bh(&ip6ip6_lock); | |
185 | *tp = t; | |
186 | write_unlock_bh(&ip6ip6_lock); | |
187 | } | |
188 | ||
189 | /** | |
190 | * ip6ip6_tnl_unlink - remove tunnel from hash table | |
191 | * @t: tunnel to be removed | |
192 | **/ | |
193 | ||
194 | static void | |
195 | ip6ip6_tnl_unlink(struct ip6_tnl *t) | |
196 | { | |
197 | struct ip6_tnl **tp; | |
198 | ||
199 | for (tp = ip6ip6_bucket(&t->parms); *tp; tp = &(*tp)->next) { | |
200 | if (t == *tp) { | |
201 | write_lock_bh(&ip6ip6_lock); | |
202 | *tp = t->next; | |
203 | write_unlock_bh(&ip6ip6_lock); | |
204 | break; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | /** | |
210 | * ip6_tnl_create() - create a new tunnel | |
211 | * @p: tunnel parameters | |
212 | * @pt: pointer to new tunnel | |
213 | * | |
214 | * Description: | |
215 | * Create tunnel matching given parameters. | |
1ab1457c YH |
216 | * |
217 | * Return: | |
567131a7 | 218 | * created tunnel or NULL |
1da177e4 LT |
219 | **/ |
220 | ||
567131a7 | 221 | static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p) |
1da177e4 LT |
222 | { |
223 | struct net_device *dev; | |
224 | struct ip6_tnl *t; | |
225 | char name[IFNAMSIZ]; | |
226 | int err; | |
227 | ||
228 | if (p->name[0]) { | |
229 | strlcpy(name, p->name, IFNAMSIZ); | |
230 | } else { | |
231 | int i; | |
232 | for (i = 1; i < IP6_TNL_MAX; i++) { | |
233 | sprintf(name, "ip6tnl%d", i); | |
234 | if (__dev_get_by_name(name) == NULL) | |
235 | break; | |
236 | } | |
1ab1457c | 237 | if (i == IP6_TNL_MAX) |
567131a7 | 238 | goto failed; |
1da177e4 LT |
239 | } |
240 | dev = alloc_netdev(sizeof (*t), name, ip6ip6_tnl_dev_setup); | |
241 | if (dev == NULL) | |
567131a7 | 242 | goto failed; |
1da177e4 | 243 | |
2941a486 | 244 | t = netdev_priv(dev); |
1da177e4 LT |
245 | dev->init = ip6ip6_tnl_dev_init; |
246 | t->parms = *p; | |
247 | ||
248 | if ((err = register_netdevice(dev)) < 0) { | |
249 | free_netdev(dev); | |
567131a7 | 250 | goto failed; |
1da177e4 LT |
251 | } |
252 | dev_hold(dev); | |
1da177e4 | 253 | ip6ip6_tnl_link(t); |
567131a7 VN |
254 | return t; |
255 | failed: | |
256 | return NULL; | |
1da177e4 LT |
257 | } |
258 | ||
259 | /** | |
260 | * ip6ip6_tnl_locate - find or create tunnel matching given parameters | |
1ab1457c | 261 | * @p: tunnel parameters |
1da177e4 LT |
262 | * @create: != 0 if allowed to create new tunnel if no match found |
263 | * | |
264 | * Description: | |
265 | * ip6ip6_tnl_locate() first tries to locate an existing tunnel | |
266 | * based on @parms. If this is unsuccessful, but @create is set a new | |
267 | * tunnel device is created and registered for use. | |
268 | * | |
269 | * Return: | |
567131a7 | 270 | * matching tunnel or NULL |
1da177e4 LT |
271 | **/ |
272 | ||
567131a7 | 273 | static struct ip6_tnl *ip6ip6_tnl_locate(struct ip6_tnl_parm *p, int create) |
1da177e4 LT |
274 | { |
275 | struct in6_addr *remote = &p->raddr; | |
276 | struct in6_addr *local = &p->laddr; | |
277 | struct ip6_tnl *t; | |
278 | ||
1da177e4 LT |
279 | for (t = *ip6ip6_bucket(p); t; t = t->next) { |
280 | if (ipv6_addr_equal(local, &t->parms.laddr) && | |
567131a7 VN |
281 | ipv6_addr_equal(remote, &t->parms.raddr)) |
282 | return t; | |
1da177e4 LT |
283 | } |
284 | if (!create) | |
567131a7 VN |
285 | return NULL; |
286 | return ip6_tnl_create(p); | |
1da177e4 LT |
287 | } |
288 | ||
289 | /** | |
290 | * ip6ip6_tnl_dev_uninit - tunnel device uninitializer | |
291 | * @dev: the device to be destroyed | |
1ab1457c | 292 | * |
1da177e4 LT |
293 | * Description: |
294 | * ip6ip6_tnl_dev_uninit() removes tunnel from its list | |
295 | **/ | |
296 | ||
297 | static void | |
298 | ip6ip6_tnl_dev_uninit(struct net_device *dev) | |
299 | { | |
2941a486 | 300 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
301 | |
302 | if (dev == ip6ip6_fb_tnl_dev) { | |
303 | write_lock_bh(&ip6ip6_lock); | |
304 | tnls_wc[0] = NULL; | |
305 | write_unlock_bh(&ip6ip6_lock); | |
306 | } else { | |
307 | ip6ip6_tnl_unlink(t); | |
308 | } | |
309 | ip6_tnl_dst_reset(t); | |
310 | dev_put(dev); | |
311 | } | |
312 | ||
313 | /** | |
314 | * parse_tvl_tnl_enc_lim - handle encapsulation limit option | |
315 | * @skb: received socket buffer | |
316 | * | |
1ab1457c YH |
317 | * Return: |
318 | * 0 if none was found, | |
1da177e4 LT |
319 | * else index to encapsulation limit |
320 | **/ | |
321 | ||
322 | static __u16 | |
323 | parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) | |
324 | { | |
325 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; | |
326 | __u8 nexthdr = ipv6h->nexthdr; | |
327 | __u16 off = sizeof (*ipv6h); | |
328 | ||
329 | while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { | |
330 | __u16 optlen = 0; | |
331 | struct ipv6_opt_hdr *hdr; | |
332 | if (raw + off + sizeof (*hdr) > skb->data && | |
333 | !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) | |
334 | break; | |
335 | ||
336 | hdr = (struct ipv6_opt_hdr *) (raw + off); | |
337 | if (nexthdr == NEXTHDR_FRAGMENT) { | |
338 | struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; | |
339 | if (frag_hdr->frag_off) | |
340 | break; | |
341 | optlen = 8; | |
342 | } else if (nexthdr == NEXTHDR_AUTH) { | |
343 | optlen = (hdr->hdrlen + 2) << 2; | |
344 | } else { | |
345 | optlen = ipv6_optlen(hdr); | |
346 | } | |
347 | if (nexthdr == NEXTHDR_DEST) { | |
348 | __u16 i = off + 2; | |
349 | while (1) { | |
350 | struct ipv6_tlv_tnl_enc_lim *tel; | |
351 | ||
352 | /* No more room for encapsulation limit */ | |
353 | if (i + sizeof (*tel) > off + optlen) | |
354 | break; | |
355 | ||
356 | tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; | |
357 | /* return index of option if found and valid */ | |
358 | if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && | |
359 | tel->length == 1) | |
360 | return i; | |
361 | /* else jump to next option */ | |
362 | if (tel->type) | |
363 | i += tel->length + 2; | |
364 | else | |
365 | i++; | |
366 | } | |
367 | } | |
368 | nexthdr = hdr->nexthdr; | |
369 | off += optlen; | |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
374 | /** | |
e490d1d8 | 375 | * ip6_tnl_err - tunnel error handler |
1da177e4 LT |
376 | * |
377 | * Description: | |
e490d1d8 | 378 | * ip6_tnl_err() should handle errors in the tunnel according |
1da177e4 LT |
379 | * to the specifications in RFC 2473. |
380 | **/ | |
381 | ||
d2acc347 | 382 | static int |
e490d1d8 YK |
383 | ip6_tnl_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
384 | int *type, int *code, int *msg, __be32 *info, int offset) | |
1da177e4 LT |
385 | { |
386 | struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; | |
387 | struct ip6_tnl *t; | |
388 | int rel_msg = 0; | |
389 | int rel_type = ICMPV6_DEST_UNREACH; | |
390 | int rel_code = ICMPV6_ADDR_UNREACH; | |
391 | __u32 rel_info = 0; | |
392 | __u16 len; | |
d2acc347 | 393 | int err = -ENOENT; |
1da177e4 | 394 | |
1ab1457c YH |
395 | /* If the packet doesn't contain the original IPv6 header we are |
396 | in trouble since we might need the source address for further | |
1da177e4 LT |
397 | processing of the error. */ |
398 | ||
399 | read_lock(&ip6ip6_lock); | |
400 | if ((t = ip6ip6_tnl_lookup(&ipv6h->daddr, &ipv6h->saddr)) == NULL) | |
401 | goto out; | |
402 | ||
d2acc347 HX |
403 | err = 0; |
404 | ||
e490d1d8 | 405 | switch (*type) { |
1da177e4 LT |
406 | __u32 teli; |
407 | struct ipv6_tlv_tnl_enc_lim *tel; | |
408 | __u32 mtu; | |
409 | case ICMPV6_DEST_UNREACH: | |
410 | if (net_ratelimit()) | |
411 | printk(KERN_WARNING | |
412 | "%s: Path to destination invalid " | |
413 | "or inactive!\n", t->parms.name); | |
414 | rel_msg = 1; | |
415 | break; | |
416 | case ICMPV6_TIME_EXCEED: | |
e490d1d8 | 417 | if ((*code) == ICMPV6_EXC_HOPLIMIT) { |
1da177e4 LT |
418 | if (net_ratelimit()) |
419 | printk(KERN_WARNING | |
420 | "%s: Too small hop limit or " | |
1ab1457c | 421 | "routing loop in tunnel!\n", |
1da177e4 LT |
422 | t->parms.name); |
423 | rel_msg = 1; | |
424 | } | |
425 | break; | |
426 | case ICMPV6_PARAMPROB: | |
107a5fe6 | 427 | teli = 0; |
e490d1d8 | 428 | if ((*code) == ICMPV6_HDR_FIELD) |
107a5fe6 | 429 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); |
1da177e4 | 430 | |
e490d1d8 | 431 | if (teli && teli == ntohl(*info) - 2) { |
1da177e4 LT |
432 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; |
433 | if (tel->encap_limit == 0) { | |
434 | if (net_ratelimit()) | |
435 | printk(KERN_WARNING | |
436 | "%s: Too small encapsulation " | |
437 | "limit or routing loop in " | |
438 | "tunnel!\n", t->parms.name); | |
439 | rel_msg = 1; | |
440 | } | |
107a5fe6 VN |
441 | } else if (net_ratelimit()) { |
442 | printk(KERN_WARNING | |
443 | "%s: Recipient unable to parse tunneled " | |
444 | "packet!\n ", t->parms.name); | |
1da177e4 LT |
445 | } |
446 | break; | |
447 | case ICMPV6_PKT_TOOBIG: | |
e490d1d8 | 448 | mtu = ntohl(*info) - offset; |
1da177e4 LT |
449 | if (mtu < IPV6_MIN_MTU) |
450 | mtu = IPV6_MIN_MTU; | |
451 | t->dev->mtu = mtu; | |
452 | ||
cc6cdac0 | 453 | if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { |
1da177e4 LT |
454 | rel_type = ICMPV6_PKT_TOOBIG; |
455 | rel_code = 0; | |
456 | rel_info = mtu; | |
457 | rel_msg = 1; | |
458 | } | |
459 | break; | |
460 | } | |
e490d1d8 YK |
461 | |
462 | *type = rel_type; | |
463 | *code = rel_code; | |
464 | *info = rel_info; | |
465 | *msg = rel_msg; | |
466 | ||
467 | out: | |
468 | read_unlock(&ip6ip6_lock); | |
469 | return err; | |
470 | } | |
471 | ||
472 | static int | |
473 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
474 | int type, int code, int offset, __u32 info) | |
475 | { | |
476 | int rel_msg = 0; | |
477 | int rel_type = type; | |
478 | int rel_code = code; | |
479 | __u32 rel_info = info; | |
480 | int err; | |
481 | ||
482 | err = ip6_tnl_err(skb, opt, &rel_type, &rel_code, &rel_msg, &rel_info, | |
483 | offset); | |
484 | if (err < 0) | |
485 | return err; | |
486 | ||
487 | if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { | |
1da177e4 LT |
488 | struct rt6_info *rt; |
489 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 490 | |
1da177e4 | 491 | if (!skb2) |
e490d1d8 | 492 | return 0; |
1da177e4 LT |
493 | |
494 | dst_release(skb2->dst); | |
495 | skb2->dst = NULL; | |
496 | skb_pull(skb2, offset); | |
497 | skb2->nh.raw = skb2->data; | |
498 | ||
499 | /* Try to guess incoming interface */ | |
500 | rt = rt6_lookup(&skb2->nh.ipv6h->saddr, NULL, 0, 0); | |
501 | ||
502 | if (rt && rt->rt6i_dev) | |
503 | skb2->dev = rt->rt6i_dev; | |
504 | ||
505 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
506 | ||
507 | if (rt) | |
508 | dst_release(&rt->u.dst); | |
509 | ||
510 | kfree_skb(skb2); | |
511 | } | |
e490d1d8 YK |
512 | |
513 | return 0; | |
1da177e4 LT |
514 | } |
515 | ||
8359925b YK |
516 | static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, |
517 | struct ipv6hdr *ipv6h, | |
518 | struct sk_buff *skb) | |
1da177e4 | 519 | { |
8359925b YK |
520 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
521 | ipv6_copy_dscp(ipv6h, skb->nh.ipv6h); | |
1da177e4 | 522 | |
8359925b YK |
523 | if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) |
524 | IP6_ECN_set_ce(skb->nh.ipv6h); | |
1da177e4 | 525 | } |
8359925b | 526 | |
09c6bbf0 VN |
527 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
528 | { | |
529 | struct ip6_tnl_parm *p = &t->parms; | |
530 | int ret = 0; | |
531 | ||
532 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
1ab1457c | 533 | struct net_device *ldev = NULL; |
09c6bbf0 VN |
534 | |
535 | if (p->link) | |
536 | ldev = dev_get_by_index(p->link); | |
537 | ||
538 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
539 | likely(ipv6_chk_addr(&p->laddr, ldev, 0))) && | |
540 | likely(!ipv6_chk_addr(&p->raddr, NULL, 0))) | |
541 | ret = 1; | |
542 | ||
543 | if (ldev) | |
544 | dev_put(ldev); | |
545 | } | |
546 | return ret; | |
547 | } | |
1da177e4 LT |
548 | |
549 | /** | |
550 | * ip6ip6_rcv - decapsulate IPv6 packet and retransmit it locally | |
551 | * @skb: received socket buffer | |
8359925b YK |
552 | * @protocol: ethernet protocol ID |
553 | * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN | |
1da177e4 LT |
554 | * |
555 | * Return: 0 | |
556 | **/ | |
557 | ||
8359925b YK |
558 | static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, |
559 | void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, | |
560 | struct ipv6hdr *ipv6h, | |
561 | struct sk_buff *skb)) | |
1da177e4 | 562 | { |
1da177e4 LT |
563 | struct ipv6hdr *ipv6h; |
564 | struct ip6_tnl *t; | |
565 | ||
1da177e4 LT |
566 | ipv6h = skb->nh.ipv6h; |
567 | ||
568 | read_lock(&ip6ip6_lock); | |
569 | ||
570 | if ((t = ip6ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) { | |
571 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9f0ede52 | 572 | read_unlock(&ip6ip6_lock); |
50fba2aa | 573 | goto discard; |
1da177e4 LT |
574 | } |
575 | ||
09c6bbf0 | 576 | if (!ip6_tnl_rcv_ctl(t)) { |
1da177e4 LT |
577 | t->stat.rx_dropped++; |
578 | read_unlock(&ip6ip6_lock); | |
579 | goto discard; | |
580 | } | |
581 | secpath_reset(skb); | |
582 | skb->mac.raw = skb->nh.raw; | |
583 | skb->nh.raw = skb->data; | |
8359925b | 584 | skb->protocol = htons(protocol); |
1da177e4 LT |
585 | skb->pkt_type = PACKET_HOST; |
586 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
587 | skb->dev = t->dev; | |
588 | dst_release(skb->dst); | |
589 | skb->dst = NULL; | |
53ab61c6 | 590 | nf_reset(skb); |
8359925b YK |
591 | |
592 | dscp_ecn_decapsulate(t, ipv6h, skb); | |
593 | ||
1da177e4 LT |
594 | t->stat.rx_packets++; |
595 | t->stat.rx_bytes += skb->len; | |
596 | netif_rx(skb); | |
597 | read_unlock(&ip6ip6_lock); | |
598 | return 0; | |
599 | } | |
600 | read_unlock(&ip6ip6_lock); | |
1da177e4 | 601 | return 1; |
50fba2aa HX |
602 | |
603 | discard: | |
604 | kfree_skb(skb); | |
605 | return 0; | |
1da177e4 LT |
606 | } |
607 | ||
8359925b YK |
608 | static int ip6ip6_rcv(struct sk_buff *skb) |
609 | { | |
610 | return ip6_tnl_rcv(skb, ETH_P_IPV6, ip6ip6_dscp_ecn_decapsulate); | |
611 | } | |
612 | ||
6fb32dde VN |
613 | struct ipv6_tel_txoption { |
614 | struct ipv6_txoptions ops; | |
615 | __u8 dst_opt[8]; | |
616 | }; | |
1da177e4 | 617 | |
6fb32dde VN |
618 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
619 | { | |
620 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 621 | |
6fb32dde VN |
622 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
623 | opt->dst_opt[3] = 1; | |
624 | opt->dst_opt[4] = encap_limit; | |
625 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
626 | opt->dst_opt[6] = 1; | |
1da177e4 | 627 | |
6fb32dde VN |
628 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
629 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
630 | } |
631 | ||
632 | /** | |
633 | * ip6ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
634 | * @t: the outgoing tunnel device | |
1ab1457c | 635 | * @hdr: IPv6 header from the incoming packet |
1da177e4 LT |
636 | * |
637 | * Description: | |
1ab1457c | 638 | * Avoid trivial tunneling loop by checking that tunnel exit-point |
1da177e4 LT |
639 | * doesn't match source of incoming packet. |
640 | * | |
1ab1457c | 641 | * Return: |
1da177e4 LT |
642 | * 1 if conflict, |
643 | * 0 else | |
644 | **/ | |
645 | ||
646 | static inline int | |
647 | ip6ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) | |
648 | { | |
649 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
650 | } | |
651 | ||
09c6bbf0 VN |
652 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
653 | { | |
654 | struct ip6_tnl_parm *p = &t->parms; | |
655 | int ret = 0; | |
656 | ||
1ab1457c | 657 | if (p->flags & IP6_TNL_F_CAP_XMIT) { |
09c6bbf0 VN |
658 | struct net_device *ldev = NULL; |
659 | ||
660 | if (p->link) | |
661 | ldev = dev_get_by_index(p->link); | |
662 | ||
663 | if (unlikely(!ipv6_chk_addr(&p->laddr, ldev, 0))) | |
664 | printk(KERN_WARNING | |
665 | "%s xmit: Local address not yet configured!\n", | |
666 | p->name); | |
667 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
668 | unlikely(ipv6_chk_addr(&p->raddr, NULL, 0))) | |
669 | printk(KERN_WARNING | |
670 | "%s xmit: Routing loop! " | |
671 | "Remote address found on this node!\n", | |
672 | p->name); | |
673 | else | |
674 | ret = 1; | |
675 | if (ldev) | |
676 | dev_put(ldev); | |
677 | } | |
678 | return ret; | |
679 | } | |
1da177e4 | 680 | /** |
61ec2aec | 681 | * ip6_tnl_xmit2 - encapsulate packet and send |
1da177e4 | 682 | * @skb: the outgoing socket buffer |
1ab1457c | 683 | * @dev: the outgoing tunnel device |
61ec2aec YK |
684 | * @dsfield: dscp code for outer header |
685 | * @fl: flow of tunneled packet | |
686 | * @encap_limit: encapsulation limit | |
687 | * @pmtu: Path MTU is stored if packet is too big | |
1da177e4 LT |
688 | * |
689 | * Description: | |
690 | * Build new header and do some sanity checks on the packet before sending | |
691 | * it. | |
692 | * | |
1ab1457c | 693 | * Return: |
1da177e4 | 694 | * 0 |
61ec2aec YK |
695 | * -1 fail |
696 | * %-EMSGSIZE message too big. return mtu in this case. | |
1da177e4 LT |
697 | **/ |
698 | ||
61ec2aec YK |
699 | static int ip6_tnl_xmit2(struct sk_buff *skb, |
700 | struct net_device *dev, | |
701 | __u8 dsfield, | |
702 | struct flowi *fl, | |
703 | int encap_limit, | |
704 | __u32 *pmtu) | |
1da177e4 | 705 | { |
2941a486 | 706 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
707 | struct net_device_stats *stats = &t->stat; |
708 | struct ipv6hdr *ipv6h = skb->nh.ipv6h; | |
6fb32dde | 709 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
710 | struct dst_entry *dst; |
711 | struct net_device *tdev; | |
712 | int mtu; | |
713 | int max_headroom = sizeof(struct ipv6hdr); | |
714 | u8 proto; | |
61ec2aec | 715 | int err = -1; |
1da177e4 | 716 | int pkt_len; |
1da177e4 | 717 | |
1da177e4 LT |
718 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
719 | dst_hold(dst); | |
a57ebc90 | 720 | else { |
61ec2aec | 721 | dst = ip6_route_output(NULL, fl); |
1da177e4 | 722 | |
61ec2aec | 723 | if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) |
a57ebc90 PM |
724 | goto tx_err_link_failure; |
725 | } | |
1da177e4 LT |
726 | |
727 | tdev = dst->dev; | |
728 | ||
729 | if (tdev == dev) { | |
730 | stats->collisions++; | |
731 | if (net_ratelimit()) | |
1ab1457c | 732 | printk(KERN_WARNING |
1da177e4 LT |
733 | "%s: Local routing loop detected!\n", |
734 | t->parms.name); | |
735 | goto tx_err_dst_release; | |
736 | } | |
737 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 738 | if (encap_limit >= 0) { |
1da177e4 LT |
739 | max_headroom += 8; |
740 | mtu -= 8; | |
741 | } | |
742 | if (mtu < IPV6_MIN_MTU) | |
743 | mtu = IPV6_MIN_MTU; | |
26892058 YK |
744 | if (skb->dst) |
745 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1da177e4 | 746 | if (skb->len > mtu) { |
61ec2aec YK |
747 | *pmtu = mtu; |
748 | err = -EMSGSIZE; | |
1da177e4 LT |
749 | goto tx_err_dst_release; |
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); | |
1ab1457c YH |
756 | |
757 | if (skb_headroom(skb) < max_headroom || | |
1da177e4 LT |
758 | skb_cloned(skb) || skb_shared(skb)) { |
759 | struct sk_buff *new_skb; | |
1ab1457c | 760 | |
1da177e4 LT |
761 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) |
762 | goto tx_err_dst_release; | |
763 | ||
764 | if (skb->sk) | |
765 | skb_set_owner_w(new_skb, skb->sk); | |
766 | kfree_skb(skb); | |
767 | skb = new_skb; | |
768 | } | |
769 | dst_release(skb->dst); | |
770 | skb->dst = dst_clone(dst); | |
771 | ||
772 | skb->h.raw = skb->nh.raw; | |
773 | ||
61ec2aec | 774 | proto = fl->proto; |
6fb32dde VN |
775 | if (encap_limit >= 0) { |
776 | init_tel_txopt(&opt, encap_limit); | |
777 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
778 | } | |
1da177e4 LT |
779 | skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr)); |
780 | ipv6h = skb->nh.ipv6h; | |
61ec2aec | 781 | *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
782 | dsfield = INET_ECN_encapsulate(0, dsfield); |
783 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
784 | ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
785 | ipv6h->hop_limit = t->parms.hop_limit; | |
786 | ipv6h->nexthdr = proto; | |
61ec2aec YK |
787 | ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); |
788 | ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); | |
1da177e4 LT |
789 | nf_reset(skb); |
790 | pkt_len = skb->len; | |
1ab1457c | 791 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, |
1da177e4 LT |
792 | skb->dst->dev, dst_output); |
793 | ||
b9df3cb8 | 794 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
795 | stats->tx_bytes += pkt_len; |
796 | stats->tx_packets++; | |
797 | } else { | |
798 | stats->tx_errors++; | |
799 | stats->tx_aborted_errors++; | |
800 | } | |
801 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
802 | return 0; |
803 | tx_err_link_failure: | |
804 | stats->tx_carrier_errors++; | |
805 | dst_link_failure(skb); | |
806 | tx_err_dst_release: | |
807 | dst_release(dst); | |
61ec2aec YK |
808 | return err; |
809 | } | |
810 | ||
811 | static inline int | |
812 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
813 | { | |
814 | struct ip6_tnl *t = netdev_priv(dev); | |
815 | struct ipv6hdr *ipv6h = skb->nh.ipv6h; | |
816 | int encap_limit = -1; | |
817 | __u16 offset; | |
818 | struct flowi fl; | |
819 | __u8 dsfield; | |
820 | __u32 mtu; | |
821 | int err; | |
822 | ||
823 | if (!ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h)) | |
824 | return -1; | |
825 | ||
826 | if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) { | |
827 | struct ipv6_tlv_tnl_enc_lim *tel; | |
828 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset]; | |
829 | if (tel->encap_limit == 0) { | |
830 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
831 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
832 | return -1; | |
833 | } | |
834 | encap_limit = tel->encap_limit - 1; | |
835 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) | |
836 | encap_limit = t->parms.encap_limit; | |
837 | ||
838 | memcpy(&fl, &t->fl, sizeof (fl)); | |
839 | fl.proto = IPPROTO_IPV6; | |
840 | ||
841 | dsfield = ipv6_get_dsfield(ipv6h); | |
842 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
843 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); | |
844 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
845 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); | |
846 | ||
847 | err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); | |
848 | if (err != 0) { | |
849 | if (err == -EMSGSIZE) | |
850 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
851 | return -1; | |
852 | } | |
853 | ||
854 | return 0; | |
855 | } | |
856 | ||
857 | static int | |
858 | ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
859 | { | |
860 | struct ip6_tnl *t = netdev_priv(dev); | |
861 | struct net_device_stats *stats = &t->stat; | |
862 | int ret; | |
863 | ||
864 | if (t->recursion++) { | |
865 | t->stat.collisions++; | |
866 | goto tx_err; | |
867 | } | |
868 | ||
869 | switch (skb->protocol) { | |
870 | case __constant_htons(ETH_P_IPV6): | |
871 | ret = ip6ip6_tnl_xmit(skb, dev); | |
872 | break; | |
873 | default: | |
874 | goto tx_err; | |
875 | } | |
876 | ||
877 | if (ret < 0) | |
878 | goto tx_err; | |
879 | ||
880 | t->recursion--; | |
881 | return 0; | |
882 | ||
1da177e4 LT |
883 | tx_err: |
884 | stats->tx_errors++; | |
885 | stats->tx_dropped++; | |
886 | kfree_skb(skb); | |
887 | t->recursion--; | |
888 | return 0; | |
889 | } | |
890 | ||
891 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
892 | { | |
893 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
894 | int ltype = ipv6_addr_type(&p->laddr); |
895 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
896 | |
897 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
898 | ||
09c6bbf0 VN |
899 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
900 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
901 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 902 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
903 | if (ltype&IPV6_ADDR_UNICAST) |
904 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
905 | if (rtype&IPV6_ADDR_UNICAST) | |
906 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
907 | } |
908 | } | |
909 | ||
910 | static void ip6ip6_tnl_link_config(struct ip6_tnl *t) | |
911 | { | |
912 | struct net_device *dev = t->dev; | |
913 | struct ip6_tnl_parm *p = &t->parms; | |
914 | struct flowi *fl = &t->fl; | |
915 | ||
916 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
917 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
918 | ||
919 | /* Set up flowi template */ | |
920 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
921 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
922 | fl->oif = p->link; | |
923 | fl->fl6_flowlabel = 0; | |
924 | ||
925 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
926 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
927 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
928 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
929 | ||
930 | ip6_tnl_set_cap(t); | |
931 | ||
932 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
933 | dev->flags |= IFF_POINTOPOINT; | |
934 | else | |
935 | dev->flags &= ~IFF_POINTOPOINT; | |
936 | ||
937 | dev->iflink = p->link; | |
938 | ||
939 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
940 | int strict = (ipv6_addr_type(&p->raddr) & |
941 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
942 | ||
1da177e4 | 943 | struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr, |
305d4b3c | 944 | p->link, strict); |
1da177e4 LT |
945 | |
946 | if (rt == NULL) | |
947 | return; | |
948 | ||
949 | if (rt->rt6i_dev) { | |
950 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
951 | sizeof (struct ipv6hdr); | |
952 | ||
953 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
954 | ||
955 | if (dev->mtu < IPV6_MIN_MTU) | |
956 | dev->mtu = IPV6_MIN_MTU; | |
957 | } | |
958 | dst_release(&rt->u.dst); | |
959 | } | |
960 | } | |
961 | ||
962 | /** | |
963 | * ip6ip6_tnl_change - update the tunnel parameters | |
964 | * @t: tunnel to be changed | |
965 | * @p: tunnel configuration parameters | |
966 | * @active: != 0 if tunnel is ready for use | |
967 | * | |
968 | * Description: | |
969 | * ip6ip6_tnl_change() updates the tunnel parameters | |
970 | **/ | |
971 | ||
972 | static int | |
973 | ip6ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) | |
974 | { | |
975 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
976 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
977 | t->parms.flags = p->flags; | |
978 | t->parms.hop_limit = p->hop_limit; | |
979 | t->parms.encap_limit = p->encap_limit; | |
980 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 981 | t->parms.link = p->link; |
0c088890 | 982 | ip6_tnl_dst_reset(t); |
1da177e4 LT |
983 | ip6ip6_tnl_link_config(t); |
984 | return 0; | |
985 | } | |
986 | ||
987 | /** | |
1ab1457c | 988 | * ip6ip6_tnl_ioctl - configure ipv6 tunnels from userspace |
1da177e4 LT |
989 | * @dev: virtual device associated with tunnel |
990 | * @ifr: parameters passed from userspace | |
991 | * @cmd: command to be performed | |
992 | * | |
993 | * Description: | |
1ab1457c YH |
994 | * ip6ip6_tnl_ioctl() is used for managing IPv6 tunnels |
995 | * from userspace. | |
1da177e4 LT |
996 | * |
997 | * The possible commands are the following: | |
998 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
999 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
1000 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
1001 | * %SIOCDELTUNNEL: delete tunnel | |
1002 | * | |
1ab1457c | 1003 | * The fallback device "ip6tnl0", created during module |
1da177e4 LT |
1004 | * initialization, can be used for creating other tunnel devices. |
1005 | * | |
1006 | * Return: | |
1007 | * 0 on success, | |
1008 | * %-EFAULT if unable to copy data to or from userspace, | |
1009 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
1010 | * %-EINVAL if passed tunnel parameters are invalid, | |
1011 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
1012 | * %-ENODEV if attempting to change or delete a nonexisting device | |
1013 | **/ | |
1014 | ||
1015 | static int | |
1016 | ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
1017 | { | |
1018 | int err = 0; | |
1da177e4 LT |
1019 | struct ip6_tnl_parm p; |
1020 | struct ip6_tnl *t = NULL; | |
1021 | ||
1022 | switch (cmd) { | |
1023 | case SIOCGETTUNNEL: | |
1024 | if (dev == ip6ip6_fb_tnl_dev) { | |
567131a7 | 1025 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
1026 | err = -EFAULT; |
1027 | break; | |
1028 | } | |
567131a7 VN |
1029 | t = ip6ip6_tnl_locate(&p, 0); |
1030 | } | |
1031 | if (t == NULL) | |
2941a486 | 1032 | t = netdev_priv(dev); |
1da177e4 LT |
1033 | memcpy(&p, &t->parms, sizeof (p)); |
1034 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
1035 | err = -EFAULT; | |
1036 | } | |
1037 | break; | |
1038 | case SIOCADDTUNNEL: | |
1039 | case SIOCCHGTUNNEL: | |
1040 | err = -EPERM; | |
1da177e4 LT |
1041 | if (!capable(CAP_NET_ADMIN)) |
1042 | break; | |
567131a7 VN |
1043 | err = -EFAULT; |
1044 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1045 | break; |
567131a7 VN |
1046 | err = -EINVAL; |
1047 | if (p.proto != IPPROTO_IPV6) | |
1da177e4 | 1048 | break; |
567131a7 VN |
1049 | t = ip6ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); |
1050 | if (dev != ip6ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
1051 | if (t != NULL) { | |
1052 | if (t->dev != dev) { | |
1053 | err = -EEXIST; | |
1054 | break; | |
1055 | } | |
1056 | } else | |
1057 | t = netdev_priv(dev); | |
1058 | ||
1da177e4 LT |
1059 | ip6ip6_tnl_unlink(t); |
1060 | err = ip6ip6_tnl_change(t, &p); | |
1061 | ip6ip6_tnl_link(t); | |
1062 | netdev_state_change(dev); | |
1063 | } | |
567131a7 | 1064 | if (t) { |
1da177e4 | 1065 | err = 0; |
567131a7 VN |
1066 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
1067 | err = -EFAULT; | |
1068 | ||
1069 | } else | |
1070 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
1071 | break; |
1072 | case SIOCDELTUNNEL: | |
1073 | err = -EPERM; | |
1074 | if (!capable(CAP_NET_ADMIN)) | |
1075 | break; | |
1076 | ||
1077 | if (dev == ip6ip6_fb_tnl_dev) { | |
567131a7 VN |
1078 | err = -EFAULT; |
1079 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 1080 | break; |
567131a7 VN |
1081 | err = -ENOENT; |
1082 | if ((t = ip6ip6_tnl_locate(&p, 0)) == NULL) | |
1da177e4 | 1083 | break; |
567131a7 VN |
1084 | err = -EPERM; |
1085 | if (t->dev == ip6ip6_fb_tnl_dev) | |
1da177e4 | 1086 | break; |
567131a7 | 1087 | dev = t->dev; |
1da177e4 | 1088 | } |
22f8cde5 SH |
1089 | err = 0; |
1090 | unregister_netdevice(dev); | |
1da177e4 LT |
1091 | break; |
1092 | default: | |
1093 | err = -EINVAL; | |
1094 | } | |
1095 | return err; | |
1096 | } | |
1097 | ||
1098 | /** | |
1ab1457c | 1099 | * ip6ip6_tnl_get_stats - return the stats for tunnel device |
1da177e4 LT |
1100 | * @dev: virtual device associated with tunnel |
1101 | * | |
1102 | * Return: stats for device | |
1103 | **/ | |
1104 | ||
1105 | static struct net_device_stats * | |
1106 | ip6ip6_tnl_get_stats(struct net_device *dev) | |
1107 | { | |
2941a486 | 1108 | return &(((struct ip6_tnl *)netdev_priv(dev))->stat); |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | /** | |
1112 | * ip6ip6_tnl_change_mtu - change mtu manually for tunnel device | |
1113 | * @dev: virtual device associated with tunnel | |
1114 | * @new_mtu: the new mtu | |
1115 | * | |
1116 | * Return: | |
1117 | * 0 on success, | |
1118 | * %-EINVAL if mtu too small | |
1119 | **/ | |
1120 | ||
1121 | static int | |
1122 | ip6ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) | |
1123 | { | |
1124 | if (new_mtu < IPV6_MIN_MTU) { | |
1125 | return -EINVAL; | |
1126 | } | |
1127 | dev->mtu = new_mtu; | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * ip6ip6_tnl_dev_setup - setup virtual tunnel device | |
1133 | * @dev: virtual device associated with tunnel | |
1134 | * | |
1135 | * Description: | |
1136 | * Initialize function pointers and device parameters | |
1137 | **/ | |
1138 | ||
1139 | static void ip6ip6_tnl_dev_setup(struct net_device *dev) | |
1140 | { | |
1141 | SET_MODULE_OWNER(dev); | |
1142 | dev->uninit = ip6ip6_tnl_dev_uninit; | |
1143 | dev->destructor = free_netdev; | |
61ec2aec | 1144 | dev->hard_start_xmit = ip6_tnl_xmit; |
1da177e4 LT |
1145 | dev->get_stats = ip6ip6_tnl_get_stats; |
1146 | dev->do_ioctl = ip6ip6_tnl_ioctl; | |
1147 | dev->change_mtu = ip6ip6_tnl_change_mtu; | |
1148 | ||
1149 | dev->type = ARPHRD_TUNNEL6; | |
1150 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1151 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1152 | dev->flags |= IFF_NOARP; | |
1153 | dev->addr_len = sizeof(struct in6_addr); | |
1154 | } | |
1155 | ||
1156 | ||
1157 | /** | |
1158 | * ip6ip6_tnl_dev_init_gen - general initializer for all tunnel devices | |
1159 | * @dev: virtual device associated with tunnel | |
1160 | **/ | |
1161 | ||
1162 | static inline void | |
1163 | ip6ip6_tnl_dev_init_gen(struct net_device *dev) | |
1164 | { | |
2941a486 | 1165 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1166 | t->fl.proto = IPPROTO_IPV6; |
1167 | t->dev = dev; | |
1168 | strcpy(t->parms.name, dev->name); | |
1169 | } | |
1170 | ||
1171 | /** | |
1172 | * ip6ip6_tnl_dev_init - initializer for all non fallback tunnel devices | |
1173 | * @dev: virtual device associated with tunnel | |
1174 | **/ | |
1175 | ||
1176 | static int | |
1177 | ip6ip6_tnl_dev_init(struct net_device *dev) | |
1178 | { | |
2941a486 | 1179 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1180 | ip6ip6_tnl_dev_init_gen(dev); |
1181 | ip6ip6_tnl_link_config(t); | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * ip6ip6_fb_tnl_dev_init - initializer for fallback tunnel device | |
1187 | * @dev: fallback device | |
1188 | * | |
1189 | * Return: 0 | |
1190 | **/ | |
1191 | ||
1ab1457c | 1192 | static int |
1da177e4 LT |
1193 | ip6ip6_fb_tnl_dev_init(struct net_device *dev) |
1194 | { | |
2941a486 | 1195 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1196 | ip6ip6_tnl_dev_init_gen(dev); |
1197 | dev_hold(dev); | |
1198 | tnls_wc[0] = t; | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static struct xfrm6_tunnel ip6ip6_handler = { | |
0303770d PM |
1203 | .handler = ip6ip6_rcv, |
1204 | .err_handler = ip6ip6_err, | |
d2acc347 | 1205 | .priority = 1, |
1da177e4 LT |
1206 | }; |
1207 | ||
1208 | /** | |
1209 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1210 | * | |
1211 | * Return: 0 on success | |
1212 | **/ | |
1213 | ||
1214 | static int __init ip6_tunnel_init(void) | |
1215 | { | |
1216 | int err; | |
1217 | ||
73d605d1 | 1218 | if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { |
1da177e4 LT |
1219 | printk(KERN_ERR "ip6ip6 init: can't register tunnel\n"); |
1220 | return -EAGAIN; | |
1221 | } | |
1222 | ip6ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1223 | ip6ip6_tnl_dev_setup); | |
1224 | ||
1225 | if (!ip6ip6_fb_tnl_dev) { | |
1226 | err = -ENOMEM; | |
1227 | goto fail; | |
1228 | } | |
1229 | ip6ip6_fb_tnl_dev->init = ip6ip6_fb_tnl_dev_init; | |
1230 | ||
1231 | if ((err = register_netdev(ip6ip6_fb_tnl_dev))) { | |
1232 | free_netdev(ip6ip6_fb_tnl_dev); | |
1233 | goto fail; | |
1234 | } | |
1235 | return 0; | |
1236 | fail: | |
73d605d1 | 1237 | xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); |
1da177e4 LT |
1238 | return err; |
1239 | } | |
1240 | ||
b3fdd9f1 YK |
1241 | static void __exit ip6ip6_destroy_tunnels(void) |
1242 | { | |
1243 | int h; | |
1244 | struct ip6_tnl *t; | |
1245 | ||
1246 | for (h = 0; h < HASH_SIZE; h++) { | |
1247 | while ((t = tnls_r_l[h]) != NULL) | |
1248 | unregister_netdevice(t->dev); | |
1249 | } | |
1250 | ||
1251 | t = tnls_wc[0]; | |
1252 | unregister_netdevice(t->dev); | |
1253 | } | |
1254 | ||
1da177e4 LT |
1255 | /** |
1256 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1257 | **/ | |
1258 | ||
1259 | static void __exit ip6_tunnel_cleanup(void) | |
1260 | { | |
73d605d1 | 1261 | if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) |
1da177e4 LT |
1262 | printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n"); |
1263 | ||
b3fdd9f1 YK |
1264 | rtnl_lock(); |
1265 | ip6ip6_destroy_tunnels(); | |
1266 | rtnl_unlock(); | |
1da177e4 LT |
1267 | } |
1268 | ||
1269 | module_init(ip6_tunnel_init); | |
1270 | module_exit(ip6_tunnel_cleanup); |