Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IPv6 over IPv6 tunnel device | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Ville Nuorvala <vnuorval@tcs.hut.fi> | |
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] ^ \ |
1da177e4 LT |
70 | (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ |
71 | (HASH_SIZE - 1)) | |
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 | ||
93 | if (dst && dst->obsolete && | |
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 | |
119 | * @remote: the address of the tunnel exit-point | |
120 | * @local: the address of the tunnel entry-point | |
121 | * | |
122 | * Return: | |
123 | * tunnel matching given end-points if found, | |
124 | * else fallback tunnel if its device is up, | |
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 | |
149 | * @p: parameters containing tunnel end-points | |
150 | * | |
151 | * Description: | |
152 | * ip6ip6_bucket() returns the head of the list matching the | |
153 | * &struct in6_addr entries laddr and raddr in @p. | |
154 | * | |
155 | * Return: head of IPv6 tunnel list | |
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. | |
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 | } | |
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 | |
261 | * @p: tunnel parameters | |
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 | |
292 | * | |
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 | * | |
317 | * Return: | |
318 | * 0 if none was found, | |
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 | /** | |
375 | * ip6ip6_err - tunnel error handler | |
376 | * | |
377 | * Description: | |
378 | * ip6ip6_err() should handle errors in the tunnel according | |
379 | * to the specifications in RFC 2473. | |
380 | **/ | |
381 | ||
d2acc347 | 382 | static int |
1da177e4 | 383 | ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
04ce6909 | 384 | int type, int code, int offset, __be32 info) |
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 LT |
394 | |
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 | |
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 | ||
1da177e4 LT |
405 | switch (type) { |
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: | |
417 | if (code == ICMPV6_EXC_HOPLIMIT) { | |
418 | if (net_ratelimit()) | |
419 | printk(KERN_WARNING | |
420 | "%s: Too small hop limit or " | |
421 | "routing loop in tunnel!\n", | |
422 | t->parms.name); | |
423 | rel_msg = 1; | |
424 | } | |
425 | break; | |
426 | case ICMPV6_PARAMPROB: | |
107a5fe6 VN |
427 | teli = 0; |
428 | if (code == ICMPV6_HDR_FIELD) | |
429 | teli = parse_tlv_tnl_enc_lim(skb, skb->data); | |
1da177e4 LT |
430 | |
431 | if (teli && teli == ntohl(info) - 2) { | |
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: | |
448 | mtu = ntohl(info) - offset; | |
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 | } | |
461 | if (rel_msg && pskb_may_pull(skb, offset + sizeof (*ipv6h))) { | |
462 | struct rt6_info *rt; | |
463 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
305d4b3c | 464 | |
1da177e4 LT |
465 | if (!skb2) |
466 | goto out; | |
467 | ||
468 | dst_release(skb2->dst); | |
469 | skb2->dst = NULL; | |
470 | skb_pull(skb2, offset); | |
471 | skb2->nh.raw = skb2->data; | |
472 | ||
473 | /* Try to guess incoming interface */ | |
474 | rt = rt6_lookup(&skb2->nh.ipv6h->saddr, NULL, 0, 0); | |
475 | ||
476 | if (rt && rt->rt6i_dev) | |
477 | skb2->dev = rt->rt6i_dev; | |
478 | ||
479 | icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); | |
480 | ||
481 | if (rt) | |
482 | dst_release(&rt->u.dst); | |
483 | ||
484 | kfree_skb(skb2); | |
485 | } | |
486 | out: | |
487 | read_unlock(&ip6ip6_lock); | |
d2acc347 | 488 | return err; |
1da177e4 LT |
489 | } |
490 | ||
491 | static inline void ip6ip6_ecn_decapsulate(struct ipv6hdr *outer_iph, | |
492 | struct sk_buff *skb) | |
493 | { | |
494 | struct ipv6hdr *inner_iph = skb->nh.ipv6h; | |
495 | ||
496 | if (INET_ECN_is_ce(ipv6_get_dsfield(outer_iph))) | |
497 | IP6_ECN_set_ce(inner_iph); | |
498 | } | |
09c6bbf0 VN |
499 | static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) |
500 | { | |
501 | struct ip6_tnl_parm *p = &t->parms; | |
502 | int ret = 0; | |
503 | ||
504 | if (p->flags & IP6_TNL_F_CAP_RCV) { | |
505 | struct net_device *ldev = NULL; | |
506 | ||
507 | if (p->link) | |
508 | ldev = dev_get_by_index(p->link); | |
509 | ||
510 | if ((ipv6_addr_is_multicast(&p->laddr) || | |
511 | likely(ipv6_chk_addr(&p->laddr, ldev, 0))) && | |
512 | likely(!ipv6_chk_addr(&p->raddr, NULL, 0))) | |
513 | ret = 1; | |
514 | ||
515 | if (ldev) | |
516 | dev_put(ldev); | |
517 | } | |
518 | return ret; | |
519 | } | |
1da177e4 LT |
520 | |
521 | /** | |
522 | * ip6ip6_rcv - decapsulate IPv6 packet and retransmit it locally | |
523 | * @skb: received socket buffer | |
524 | * | |
525 | * Return: 0 | |
526 | **/ | |
527 | ||
528 | static int | |
d2acc347 | 529 | ip6ip6_rcv(struct sk_buff *skb) |
1da177e4 | 530 | { |
1da177e4 LT |
531 | struct ipv6hdr *ipv6h; |
532 | struct ip6_tnl *t; | |
533 | ||
1da177e4 LT |
534 | ipv6h = skb->nh.ipv6h; |
535 | ||
536 | read_lock(&ip6ip6_lock); | |
537 | ||
538 | if ((t = ip6ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) { | |
539 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9f0ede52 | 540 | read_unlock(&ip6ip6_lock); |
50fba2aa | 541 | goto discard; |
1da177e4 LT |
542 | } |
543 | ||
09c6bbf0 | 544 | if (!ip6_tnl_rcv_ctl(t)) { |
1da177e4 LT |
545 | t->stat.rx_dropped++; |
546 | read_unlock(&ip6ip6_lock); | |
547 | goto discard; | |
548 | } | |
549 | secpath_reset(skb); | |
550 | skb->mac.raw = skb->nh.raw; | |
551 | skb->nh.raw = skb->data; | |
552 | skb->protocol = htons(ETH_P_IPV6); | |
553 | skb->pkt_type = PACKET_HOST; | |
554 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); | |
555 | skb->dev = t->dev; | |
556 | dst_release(skb->dst); | |
557 | skb->dst = NULL; | |
53ab61c6 | 558 | nf_reset(skb); |
1da177e4 LT |
559 | if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) |
560 | ipv6_copy_dscp(ipv6h, skb->nh.ipv6h); | |
561 | ip6ip6_ecn_decapsulate(ipv6h, skb); | |
562 | t->stat.rx_packets++; | |
563 | t->stat.rx_bytes += skb->len; | |
564 | netif_rx(skb); | |
565 | read_unlock(&ip6ip6_lock); | |
566 | return 0; | |
567 | } | |
568 | read_unlock(&ip6ip6_lock); | |
1da177e4 | 569 | return 1; |
50fba2aa HX |
570 | |
571 | discard: | |
572 | kfree_skb(skb); | |
573 | return 0; | |
1da177e4 LT |
574 | } |
575 | ||
6fb32dde VN |
576 | struct ipv6_tel_txoption { |
577 | struct ipv6_txoptions ops; | |
578 | __u8 dst_opt[8]; | |
579 | }; | |
1da177e4 | 580 | |
6fb32dde VN |
581 | static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) |
582 | { | |
583 | memset(opt, 0, sizeof(struct ipv6_tel_txoption)); | |
1da177e4 | 584 | |
6fb32dde VN |
585 | opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; |
586 | opt->dst_opt[3] = 1; | |
587 | opt->dst_opt[4] = encap_limit; | |
588 | opt->dst_opt[5] = IPV6_TLV_PADN; | |
589 | opt->dst_opt[6] = 1; | |
1da177e4 | 590 | |
6fb32dde VN |
591 | opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; |
592 | opt->ops.opt_nflen = 8; | |
1da177e4 LT |
593 | } |
594 | ||
595 | /** | |
596 | * ip6ip6_tnl_addr_conflict - compare packet addresses to tunnel's own | |
597 | * @t: the outgoing tunnel device | |
598 | * @hdr: IPv6 header from the incoming packet | |
599 | * | |
600 | * Description: | |
601 | * Avoid trivial tunneling loop by checking that tunnel exit-point | |
602 | * doesn't match source of incoming packet. | |
603 | * | |
604 | * Return: | |
605 | * 1 if conflict, | |
606 | * 0 else | |
607 | **/ | |
608 | ||
609 | static inline int | |
610 | ip6ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) | |
611 | { | |
612 | return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); | |
613 | } | |
614 | ||
09c6bbf0 VN |
615 | static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) |
616 | { | |
617 | struct ip6_tnl_parm *p = &t->parms; | |
618 | int ret = 0; | |
619 | ||
620 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
621 | struct net_device *ldev = NULL; | |
622 | ||
623 | if (p->link) | |
624 | ldev = dev_get_by_index(p->link); | |
625 | ||
626 | if (unlikely(!ipv6_chk_addr(&p->laddr, ldev, 0))) | |
627 | printk(KERN_WARNING | |
628 | "%s xmit: Local address not yet configured!\n", | |
629 | p->name); | |
630 | else if (!ipv6_addr_is_multicast(&p->raddr) && | |
631 | unlikely(ipv6_chk_addr(&p->raddr, NULL, 0))) | |
632 | printk(KERN_WARNING | |
633 | "%s xmit: Routing loop! " | |
634 | "Remote address found on this node!\n", | |
635 | p->name); | |
636 | else | |
637 | ret = 1; | |
638 | if (ldev) | |
639 | dev_put(ldev); | |
640 | } | |
641 | return ret; | |
642 | } | |
1da177e4 LT |
643 | /** |
644 | * ip6ip6_tnl_xmit - encapsulate packet and send | |
645 | * @skb: the outgoing socket buffer | |
646 | * @dev: the outgoing tunnel device | |
647 | * | |
648 | * Description: | |
649 | * Build new header and do some sanity checks on the packet before sending | |
650 | * it. | |
651 | * | |
652 | * Return: | |
653 | * 0 | |
654 | **/ | |
655 | ||
656 | static int | |
657 | ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) | |
658 | { | |
2941a486 | 659 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
660 | struct net_device_stats *stats = &t->stat; |
661 | struct ipv6hdr *ipv6h = skb->nh.ipv6h; | |
1da177e4 | 662 | int encap_limit = -1; |
6fb32dde | 663 | struct ipv6_tel_txoption opt; |
1da177e4 LT |
664 | __u16 offset; |
665 | struct flowi fl; | |
666 | struct dst_entry *dst; | |
667 | struct net_device *tdev; | |
668 | int mtu; | |
669 | int max_headroom = sizeof(struct ipv6hdr); | |
670 | u8 proto; | |
671 | int err; | |
672 | int pkt_len; | |
673 | int dsfield; | |
674 | ||
675 | if (t->recursion++) { | |
676 | stats->collisions++; | |
677 | goto tx_err; | |
678 | } | |
679 | if (skb->protocol != htons(ETH_P_IPV6) || | |
09c6bbf0 | 680 | !ip6_tnl_xmit_ctl(t) || ip6ip6_tnl_addr_conflict(t, ipv6h)) |
1da177e4 | 681 | goto tx_err; |
09c6bbf0 | 682 | |
1da177e4 LT |
683 | if ((offset = parse_tlv_tnl_enc_lim(skb, skb->nh.raw)) > 0) { |
684 | struct ipv6_tlv_tnl_enc_lim *tel; | |
685 | tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->nh.raw[offset]; | |
686 | if (tel->encap_limit == 0) { | |
687 | icmpv6_send(skb, ICMPV6_PARAMPROB, | |
688 | ICMPV6_HDR_FIELD, offset + 2, skb->dev); | |
689 | goto tx_err; | |
690 | } | |
691 | encap_limit = tel->encap_limit - 1; | |
6fb32dde | 692 | } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
1da177e4 | 693 | encap_limit = t->parms.encap_limit; |
6fb32dde | 694 | |
1da177e4 LT |
695 | memcpy(&fl, &t->fl, sizeof (fl)); |
696 | proto = fl.proto; | |
697 | ||
698 | dsfield = ipv6_get_dsfield(ipv6h); | |
699 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) | |
90bcaf7b | 700 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); |
1da177e4 | 701 | if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) |
90bcaf7b | 702 | fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); |
1da177e4 | 703 | |
1da177e4 LT |
704 | if ((dst = ip6_tnl_dst_check(t)) != NULL) |
705 | dst_hold(dst); | |
a57ebc90 | 706 | else { |
1da177e4 LT |
707 | dst = ip6_route_output(NULL, &fl); |
708 | ||
a57ebc90 PM |
709 | if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0) < 0) |
710 | goto tx_err_link_failure; | |
711 | } | |
1da177e4 LT |
712 | |
713 | tdev = dst->dev; | |
714 | ||
715 | if (tdev == dev) { | |
716 | stats->collisions++; | |
717 | if (net_ratelimit()) | |
718 | printk(KERN_WARNING | |
719 | "%s: Local routing loop detected!\n", | |
720 | t->parms.name); | |
721 | goto tx_err_dst_release; | |
722 | } | |
723 | mtu = dst_mtu(dst) - sizeof (*ipv6h); | |
6fb32dde | 724 | if (encap_limit >= 0) { |
1da177e4 LT |
725 | max_headroom += 8; |
726 | mtu -= 8; | |
727 | } | |
728 | if (mtu < IPV6_MIN_MTU) | |
729 | mtu = IPV6_MIN_MTU; | |
730 | if (skb->dst && mtu < dst_mtu(skb->dst)) { | |
731 | struct rt6_info *rt = (struct rt6_info *) skb->dst; | |
732 | rt->rt6i_flags |= RTF_MODIFIED; | |
733 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
734 | } | |
735 | if (skb->len > mtu) { | |
736 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
737 | goto tx_err_dst_release; | |
738 | } | |
739 | ||
740 | /* | |
741 | * Okay, now see if we can stuff it in the buffer as-is. | |
742 | */ | |
743 | max_headroom += LL_RESERVED_SPACE(tdev); | |
744 | ||
745 | if (skb_headroom(skb) < max_headroom || | |
746 | skb_cloned(skb) || skb_shared(skb)) { | |
747 | struct sk_buff *new_skb; | |
748 | ||
749 | if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) | |
750 | goto tx_err_dst_release; | |
751 | ||
752 | if (skb->sk) | |
753 | skb_set_owner_w(new_skb, skb->sk); | |
754 | kfree_skb(skb); | |
755 | skb = new_skb; | |
756 | } | |
757 | dst_release(skb->dst); | |
758 | skb->dst = dst_clone(dst); | |
759 | ||
760 | skb->h.raw = skb->nh.raw; | |
761 | ||
6fb32dde VN |
762 | if (encap_limit >= 0) { |
763 | init_tel_txopt(&opt, encap_limit); | |
764 | ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); | |
765 | } | |
1da177e4 LT |
766 | skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr)); |
767 | ipv6h = skb->nh.ipv6h; | |
90bcaf7b | 768 | *(__be32*)ipv6h = fl.fl6_flowlabel | htonl(0x60000000); |
1da177e4 LT |
769 | dsfield = INET_ECN_encapsulate(0, dsfield); |
770 | ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); | |
771 | ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
772 | ipv6h->hop_limit = t->parms.hop_limit; | |
773 | ipv6h->nexthdr = proto; | |
774 | ipv6_addr_copy(&ipv6h->saddr, &fl.fl6_src); | |
775 | ipv6_addr_copy(&ipv6h->daddr, &fl.fl6_dst); | |
776 | nf_reset(skb); | |
777 | pkt_len = skb->len; | |
778 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, | |
779 | skb->dst->dev, dst_output); | |
780 | ||
b9df3cb8 | 781 | if (net_xmit_eval(err) == 0) { |
1da177e4 LT |
782 | stats->tx_bytes += pkt_len; |
783 | stats->tx_packets++; | |
784 | } else { | |
785 | stats->tx_errors++; | |
786 | stats->tx_aborted_errors++; | |
787 | } | |
788 | ip6_tnl_dst_store(t, dst); | |
1da177e4 LT |
789 | t->recursion--; |
790 | return 0; | |
791 | tx_err_link_failure: | |
792 | stats->tx_carrier_errors++; | |
793 | dst_link_failure(skb); | |
794 | tx_err_dst_release: | |
795 | dst_release(dst); | |
1da177e4 LT |
796 | tx_err: |
797 | stats->tx_errors++; | |
798 | stats->tx_dropped++; | |
799 | kfree_skb(skb); | |
800 | t->recursion--; | |
801 | return 0; | |
802 | } | |
803 | ||
804 | static void ip6_tnl_set_cap(struct ip6_tnl *t) | |
805 | { | |
806 | struct ip6_tnl_parm *p = &t->parms; | |
09c6bbf0 VN |
807 | int ltype = ipv6_addr_type(&p->laddr); |
808 | int rtype = ipv6_addr_type(&p->raddr); | |
1da177e4 LT |
809 | |
810 | p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); | |
811 | ||
09c6bbf0 VN |
812 | if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && |
813 | rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && | |
814 | !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && | |
305d4b3c | 815 | (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { |
09c6bbf0 VN |
816 | if (ltype&IPV6_ADDR_UNICAST) |
817 | p->flags |= IP6_TNL_F_CAP_XMIT; | |
818 | if (rtype&IPV6_ADDR_UNICAST) | |
819 | p->flags |= IP6_TNL_F_CAP_RCV; | |
1da177e4 LT |
820 | } |
821 | } | |
822 | ||
823 | static void ip6ip6_tnl_link_config(struct ip6_tnl *t) | |
824 | { | |
825 | struct net_device *dev = t->dev; | |
826 | struct ip6_tnl_parm *p = &t->parms; | |
827 | struct flowi *fl = &t->fl; | |
828 | ||
829 | memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); | |
830 | memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); | |
831 | ||
832 | /* Set up flowi template */ | |
833 | ipv6_addr_copy(&fl->fl6_src, &p->laddr); | |
834 | ipv6_addr_copy(&fl->fl6_dst, &p->raddr); | |
835 | fl->oif = p->link; | |
836 | fl->fl6_flowlabel = 0; | |
837 | ||
838 | if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) | |
839 | fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; | |
840 | if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) | |
841 | fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; | |
842 | ||
843 | ip6_tnl_set_cap(t); | |
844 | ||
845 | if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) | |
846 | dev->flags |= IFF_POINTOPOINT; | |
847 | else | |
848 | dev->flags &= ~IFF_POINTOPOINT; | |
849 | ||
850 | dev->iflink = p->link; | |
851 | ||
852 | if (p->flags & IP6_TNL_F_CAP_XMIT) { | |
305d4b3c VN |
853 | int strict = (ipv6_addr_type(&p->raddr) & |
854 | (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); | |
855 | ||
1da177e4 | 856 | struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr, |
305d4b3c | 857 | p->link, strict); |
1da177e4 LT |
858 | |
859 | if (rt == NULL) | |
860 | return; | |
861 | ||
862 | if (rt->rt6i_dev) { | |
863 | dev->hard_header_len = rt->rt6i_dev->hard_header_len + | |
864 | sizeof (struct ipv6hdr); | |
865 | ||
866 | dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); | |
867 | ||
868 | if (dev->mtu < IPV6_MIN_MTU) | |
869 | dev->mtu = IPV6_MIN_MTU; | |
870 | } | |
871 | dst_release(&rt->u.dst); | |
872 | } | |
873 | } | |
874 | ||
875 | /** | |
876 | * ip6ip6_tnl_change - update the tunnel parameters | |
877 | * @t: tunnel to be changed | |
878 | * @p: tunnel configuration parameters | |
879 | * @active: != 0 if tunnel is ready for use | |
880 | * | |
881 | * Description: | |
882 | * ip6ip6_tnl_change() updates the tunnel parameters | |
883 | **/ | |
884 | ||
885 | static int | |
886 | ip6ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) | |
887 | { | |
888 | ipv6_addr_copy(&t->parms.laddr, &p->laddr); | |
889 | ipv6_addr_copy(&t->parms.raddr, &p->raddr); | |
890 | t->parms.flags = p->flags; | |
891 | t->parms.hop_limit = p->hop_limit; | |
892 | t->parms.encap_limit = p->encap_limit; | |
893 | t->parms.flowinfo = p->flowinfo; | |
8181b8c1 | 894 | t->parms.link = p->link; |
0c088890 | 895 | ip6_tnl_dst_reset(t); |
1da177e4 LT |
896 | ip6ip6_tnl_link_config(t); |
897 | return 0; | |
898 | } | |
899 | ||
900 | /** | |
901 | * ip6ip6_tnl_ioctl - configure ipv6 tunnels from userspace | |
902 | * @dev: virtual device associated with tunnel | |
903 | * @ifr: parameters passed from userspace | |
904 | * @cmd: command to be performed | |
905 | * | |
906 | * Description: | |
907 | * ip6ip6_tnl_ioctl() is used for managing IPv6 tunnels | |
908 | * from userspace. | |
909 | * | |
910 | * The possible commands are the following: | |
911 | * %SIOCGETTUNNEL: get tunnel parameters for device | |
912 | * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters | |
913 | * %SIOCCHGTUNNEL: change tunnel parameters to those given | |
914 | * %SIOCDELTUNNEL: delete tunnel | |
915 | * | |
916 | * The fallback device "ip6tnl0", created during module | |
917 | * initialization, can be used for creating other tunnel devices. | |
918 | * | |
919 | * Return: | |
920 | * 0 on success, | |
921 | * %-EFAULT if unable to copy data to or from userspace, | |
922 | * %-EPERM if current process hasn't %CAP_NET_ADMIN set | |
923 | * %-EINVAL if passed tunnel parameters are invalid, | |
924 | * %-EEXIST if changing a tunnel's parameters would cause a conflict | |
925 | * %-ENODEV if attempting to change or delete a nonexisting device | |
926 | **/ | |
927 | ||
928 | static int | |
929 | ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
930 | { | |
931 | int err = 0; | |
1da177e4 LT |
932 | struct ip6_tnl_parm p; |
933 | struct ip6_tnl *t = NULL; | |
934 | ||
935 | switch (cmd) { | |
936 | case SIOCGETTUNNEL: | |
937 | if (dev == ip6ip6_fb_tnl_dev) { | |
567131a7 | 938 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { |
1da177e4 LT |
939 | err = -EFAULT; |
940 | break; | |
941 | } | |
567131a7 VN |
942 | t = ip6ip6_tnl_locate(&p, 0); |
943 | } | |
944 | if (t == NULL) | |
2941a486 | 945 | t = netdev_priv(dev); |
1da177e4 LT |
946 | memcpy(&p, &t->parms, sizeof (p)); |
947 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { | |
948 | err = -EFAULT; | |
949 | } | |
950 | break; | |
951 | case SIOCADDTUNNEL: | |
952 | case SIOCCHGTUNNEL: | |
953 | err = -EPERM; | |
1da177e4 LT |
954 | if (!capable(CAP_NET_ADMIN)) |
955 | break; | |
567131a7 VN |
956 | err = -EFAULT; |
957 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 958 | break; |
567131a7 VN |
959 | err = -EINVAL; |
960 | if (p.proto != IPPROTO_IPV6) | |
1da177e4 | 961 | break; |
567131a7 VN |
962 | t = ip6ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); |
963 | if (dev != ip6ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { | |
964 | if (t != NULL) { | |
965 | if (t->dev != dev) { | |
966 | err = -EEXIST; | |
967 | break; | |
968 | } | |
969 | } else | |
970 | t = netdev_priv(dev); | |
971 | ||
1da177e4 LT |
972 | ip6ip6_tnl_unlink(t); |
973 | err = ip6ip6_tnl_change(t, &p); | |
974 | ip6ip6_tnl_link(t); | |
975 | netdev_state_change(dev); | |
976 | } | |
567131a7 | 977 | if (t) { |
1da177e4 | 978 | err = 0; |
567131a7 VN |
979 | if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) |
980 | err = -EFAULT; | |
981 | ||
982 | } else | |
983 | err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); | |
1da177e4 LT |
984 | break; |
985 | case SIOCDELTUNNEL: | |
986 | err = -EPERM; | |
987 | if (!capable(CAP_NET_ADMIN)) | |
988 | break; | |
989 | ||
990 | if (dev == ip6ip6_fb_tnl_dev) { | |
567131a7 VN |
991 | err = -EFAULT; |
992 | if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) | |
1da177e4 | 993 | break; |
567131a7 VN |
994 | err = -ENOENT; |
995 | if ((t = ip6ip6_tnl_locate(&p, 0)) == NULL) | |
1da177e4 | 996 | break; |
567131a7 VN |
997 | err = -EPERM; |
998 | if (t->dev == ip6ip6_fb_tnl_dev) | |
1da177e4 | 999 | break; |
567131a7 | 1000 | dev = t->dev; |
1da177e4 | 1001 | } |
567131a7 | 1002 | err = unregister_netdevice(dev); |
1da177e4 LT |
1003 | break; |
1004 | default: | |
1005 | err = -EINVAL; | |
1006 | } | |
1007 | return err; | |
1008 | } | |
1009 | ||
1010 | /** | |
1011 | * ip6ip6_tnl_get_stats - return the stats for tunnel device | |
1012 | * @dev: virtual device associated with tunnel | |
1013 | * | |
1014 | * Return: stats for device | |
1015 | **/ | |
1016 | ||
1017 | static struct net_device_stats * | |
1018 | ip6ip6_tnl_get_stats(struct net_device *dev) | |
1019 | { | |
2941a486 | 1020 | return &(((struct ip6_tnl *)netdev_priv(dev))->stat); |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | /** | |
1024 | * ip6ip6_tnl_change_mtu - change mtu manually for tunnel device | |
1025 | * @dev: virtual device associated with tunnel | |
1026 | * @new_mtu: the new mtu | |
1027 | * | |
1028 | * Return: | |
1029 | * 0 on success, | |
1030 | * %-EINVAL if mtu too small | |
1031 | **/ | |
1032 | ||
1033 | static int | |
1034 | ip6ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) | |
1035 | { | |
1036 | if (new_mtu < IPV6_MIN_MTU) { | |
1037 | return -EINVAL; | |
1038 | } | |
1039 | dev->mtu = new_mtu; | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * ip6ip6_tnl_dev_setup - setup virtual tunnel device | |
1045 | * @dev: virtual device associated with tunnel | |
1046 | * | |
1047 | * Description: | |
1048 | * Initialize function pointers and device parameters | |
1049 | **/ | |
1050 | ||
1051 | static void ip6ip6_tnl_dev_setup(struct net_device *dev) | |
1052 | { | |
1053 | SET_MODULE_OWNER(dev); | |
1054 | dev->uninit = ip6ip6_tnl_dev_uninit; | |
1055 | dev->destructor = free_netdev; | |
1056 | dev->hard_start_xmit = ip6ip6_tnl_xmit; | |
1057 | dev->get_stats = ip6ip6_tnl_get_stats; | |
1058 | dev->do_ioctl = ip6ip6_tnl_ioctl; | |
1059 | dev->change_mtu = ip6ip6_tnl_change_mtu; | |
1060 | ||
1061 | dev->type = ARPHRD_TUNNEL6; | |
1062 | dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); | |
1063 | dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); | |
1064 | dev->flags |= IFF_NOARP; | |
1065 | dev->addr_len = sizeof(struct in6_addr); | |
1066 | } | |
1067 | ||
1068 | ||
1069 | /** | |
1070 | * ip6ip6_tnl_dev_init_gen - general initializer for all tunnel devices | |
1071 | * @dev: virtual device associated with tunnel | |
1072 | **/ | |
1073 | ||
1074 | static inline void | |
1075 | ip6ip6_tnl_dev_init_gen(struct net_device *dev) | |
1076 | { | |
2941a486 | 1077 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1078 | t->fl.proto = IPPROTO_IPV6; |
1079 | t->dev = dev; | |
1080 | strcpy(t->parms.name, dev->name); | |
1081 | } | |
1082 | ||
1083 | /** | |
1084 | * ip6ip6_tnl_dev_init - initializer for all non fallback tunnel devices | |
1085 | * @dev: virtual device associated with tunnel | |
1086 | **/ | |
1087 | ||
1088 | static int | |
1089 | ip6ip6_tnl_dev_init(struct net_device *dev) | |
1090 | { | |
2941a486 | 1091 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1092 | ip6ip6_tnl_dev_init_gen(dev); |
1093 | ip6ip6_tnl_link_config(t); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | /** | |
1098 | * ip6ip6_fb_tnl_dev_init - initializer for fallback tunnel device | |
1099 | * @dev: fallback device | |
1100 | * | |
1101 | * Return: 0 | |
1102 | **/ | |
1103 | ||
1104 | static int | |
1105 | ip6ip6_fb_tnl_dev_init(struct net_device *dev) | |
1106 | { | |
2941a486 | 1107 | struct ip6_tnl *t = netdev_priv(dev); |
1da177e4 LT |
1108 | ip6ip6_tnl_dev_init_gen(dev); |
1109 | dev_hold(dev); | |
1110 | tnls_wc[0] = t; | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | static struct xfrm6_tunnel ip6ip6_handler = { | |
0303770d PM |
1115 | .handler = ip6ip6_rcv, |
1116 | .err_handler = ip6ip6_err, | |
d2acc347 | 1117 | .priority = 1, |
1da177e4 LT |
1118 | }; |
1119 | ||
1120 | /** | |
1121 | * ip6_tunnel_init - register protocol and reserve needed resources | |
1122 | * | |
1123 | * Return: 0 on success | |
1124 | **/ | |
1125 | ||
1126 | static int __init ip6_tunnel_init(void) | |
1127 | { | |
1128 | int err; | |
1129 | ||
d2acc347 | 1130 | if (xfrm6_tunnel_register(&ip6ip6_handler)) { |
1da177e4 LT |
1131 | printk(KERN_ERR "ip6ip6 init: can't register tunnel\n"); |
1132 | return -EAGAIN; | |
1133 | } | |
1134 | ip6ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", | |
1135 | ip6ip6_tnl_dev_setup); | |
1136 | ||
1137 | if (!ip6ip6_fb_tnl_dev) { | |
1138 | err = -ENOMEM; | |
1139 | goto fail; | |
1140 | } | |
1141 | ip6ip6_fb_tnl_dev->init = ip6ip6_fb_tnl_dev_init; | |
1142 | ||
1143 | if ((err = register_netdev(ip6ip6_fb_tnl_dev))) { | |
1144 | free_netdev(ip6ip6_fb_tnl_dev); | |
1145 | goto fail; | |
1146 | } | |
1147 | return 0; | |
1148 | fail: | |
d2acc347 | 1149 | xfrm6_tunnel_deregister(&ip6ip6_handler); |
1da177e4 LT |
1150 | return err; |
1151 | } | |
1152 | ||
b3fdd9f1 YK |
1153 | static void __exit ip6ip6_destroy_tunnels(void) |
1154 | { | |
1155 | int h; | |
1156 | struct ip6_tnl *t; | |
1157 | ||
1158 | for (h = 0; h < HASH_SIZE; h++) { | |
1159 | while ((t = tnls_r_l[h]) != NULL) | |
1160 | unregister_netdevice(t->dev); | |
1161 | } | |
1162 | ||
1163 | t = tnls_wc[0]; | |
1164 | unregister_netdevice(t->dev); | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | /** |
1168 | * ip6_tunnel_cleanup - free resources and unregister protocol | |
1169 | **/ | |
1170 | ||
1171 | static void __exit ip6_tunnel_cleanup(void) | |
1172 | { | |
d2acc347 | 1173 | if (xfrm6_tunnel_deregister(&ip6ip6_handler)) |
1da177e4 LT |
1174 | printk(KERN_INFO "ip6ip6 close: can't deregister tunnel\n"); |
1175 | ||
b3fdd9f1 YK |
1176 | rtnl_lock(); |
1177 | ip6ip6_destroy_tunnels(); | |
1178 | rtnl_unlock(); | |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | module_init(ip6_tunnel_init); | |
1182 | module_exit(ip6_tunnel_cleanup); |