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Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh64-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ip6_tunnel.c
1 /*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * $Id$
10 *
11 * Based on:
12 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
13 *
14 * RFC 2473
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 */
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/sockios.h>
28 #include <linux/icmp.h>
29 #include <linux/if.h>
30 #include <linux/in.h>
31 #include <linux/ip.h>
32 #include <linux/if_tunnel.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/if_arp.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <linux/route.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/netfilter_ipv6.h>
42
43 #include <asm/uaccess.h>
44 #include <asm/atomic.h>
45
46 #include <net/icmp.h>
47 #include <net/ip.h>
48 #include <net/ipv6.h>
49 #include <net/ip6_route.h>
50 #include <net/addrconf.h>
51 #include <net/ip6_tunnel.h>
52 #include <net/xfrm.h>
53 #include <net/dsfield.h>
54 #include <net/inet_ecn.h>
55
56 MODULE_AUTHOR("Ville Nuorvala");
57 MODULE_DESCRIPTION("IPv6 tunneling device");
58 MODULE_LICENSE("GPL");
59
60 #define IPV6_TLV_TEL_DST_SIZE 8
61
62 #ifdef IP6_TNL_DEBUG
63 #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __FUNCTION__)
64 #else
65 #define IP6_TNL_TRACE(x...) do {;} while(0)
66 #endif
67
68 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
69 #define IPV6_TCLASS_SHIFT 20
70
71 #define HASH_SIZE 32
72
73 #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
74 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
75 (HASH_SIZE - 1))
76
77 static int ip6_fb_tnl_dev_init(struct net_device *dev);
78 static int ip6_tnl_dev_init(struct net_device *dev);
79 static void ip6_tnl_dev_setup(struct net_device *dev);
80
81 /* the IPv6 tunnel fallback device */
82 static struct net_device *ip6_fb_tnl_dev;
83
84
85 /* lists for storing tunnels in use */
86 static struct ip6_tnl *tnls_r_l[HASH_SIZE];
87 static struct ip6_tnl *tnls_wc[1];
88 static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l };
89
90 /* lock for the tunnel lists */
91 static DEFINE_RWLOCK(ip6_tnl_lock);
92
93 static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
94 {
95 struct dst_entry *dst = t->dst_cache;
96
97 if (dst && dst->obsolete &&
98 dst->ops->check(dst, t->dst_cookie) == NULL) {
99 t->dst_cache = NULL;
100 dst_release(dst);
101 return NULL;
102 }
103
104 return dst;
105 }
106
107 static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
108 {
109 dst_release(t->dst_cache);
110 t->dst_cache = NULL;
111 }
112
113 static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
114 {
115 struct rt6_info *rt = (struct rt6_info *) dst;
116 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
117 dst_release(t->dst_cache);
118 t->dst_cache = dst;
119 }
120
121 /**
122 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
123 * @remote: the address of the tunnel exit-point
124 * @local: the address of the tunnel entry-point
125 *
126 * Return:
127 * tunnel matching given end-points if found,
128 * else fallback tunnel if its device is up,
129 * else %NULL
130 **/
131
132 static struct ip6_tnl *
133 ip6_tnl_lookup(struct in6_addr *remote, struct in6_addr *local)
134 {
135 unsigned h0 = HASH(remote);
136 unsigned h1 = HASH(local);
137 struct ip6_tnl *t;
138
139 for (t = tnls_r_l[h0 ^ h1]; t; t = t->next) {
140 if (ipv6_addr_equal(local, &t->parms.laddr) &&
141 ipv6_addr_equal(remote, &t->parms.raddr) &&
142 (t->dev->flags & IFF_UP))
143 return t;
144 }
145 if ((t = tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP))
146 return t;
147
148 return NULL;
149 }
150
151 /**
152 * ip6_tnl_bucket - get head of list matching given tunnel parameters
153 * @p: parameters containing tunnel end-points
154 *
155 * Description:
156 * ip6_tnl_bucket() returns the head of the list matching the
157 * &struct in6_addr entries laddr and raddr in @p.
158 *
159 * Return: head of IPv6 tunnel list
160 **/
161
162 static struct ip6_tnl **
163 ip6_tnl_bucket(struct ip6_tnl_parm *p)
164 {
165 struct in6_addr *remote = &p->raddr;
166 struct in6_addr *local = &p->laddr;
167 unsigned h = 0;
168 int prio = 0;
169
170 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
171 prio = 1;
172 h = HASH(remote) ^ HASH(local);
173 }
174 return &tnls[prio][h];
175 }
176
177 /**
178 * ip6_tnl_link - add tunnel to hash table
179 * @t: tunnel to be added
180 **/
181
182 static void
183 ip6_tnl_link(struct ip6_tnl *t)
184 {
185 struct ip6_tnl **tp = ip6_tnl_bucket(&t->parms);
186
187 t->next = *tp;
188 write_lock_bh(&ip6_tnl_lock);
189 *tp = t;
190 write_unlock_bh(&ip6_tnl_lock);
191 }
192
193 /**
194 * ip6_tnl_unlink - remove tunnel from hash table
195 * @t: tunnel to be removed
196 **/
197
198 static void
199 ip6_tnl_unlink(struct ip6_tnl *t)
200 {
201 struct ip6_tnl **tp;
202
203 for (tp = ip6_tnl_bucket(&t->parms); *tp; tp = &(*tp)->next) {
204 if (t == *tp) {
205 write_lock_bh(&ip6_tnl_lock);
206 *tp = t->next;
207 write_unlock_bh(&ip6_tnl_lock);
208 break;
209 }
210 }
211 }
212
213 /**
214 * ip6_tnl_create() - create a new tunnel
215 * @p: tunnel parameters
216 * @pt: pointer to new tunnel
217 *
218 * Description:
219 * Create tunnel matching given parameters.
220 *
221 * Return:
222 * created tunnel or NULL
223 **/
224
225 static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p)
226 {
227 struct net_device *dev;
228 struct ip6_tnl *t;
229 char name[IFNAMSIZ];
230 int err;
231
232 if (p->name[0]) {
233 strlcpy(name, p->name, IFNAMSIZ);
234 } else {
235 int i;
236 for (i = 1; i < IP6_TNL_MAX; i++) {
237 sprintf(name, "ip6tnl%d", i);
238 if (__dev_get_by_name(&init_net, name) == NULL)
239 break;
240 }
241 if (i == IP6_TNL_MAX)
242 goto failed;
243 }
244 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
245 if (dev == NULL)
246 goto failed;
247
248 t = netdev_priv(dev);
249 dev->init = ip6_tnl_dev_init;
250 t->parms = *p;
251
252 if ((err = register_netdevice(dev)) < 0) {
253 free_netdev(dev);
254 goto failed;
255 }
256 dev_hold(dev);
257 ip6_tnl_link(t);
258 return t;
259 failed:
260 return NULL;
261 }
262
263 /**
264 * ip6_tnl_locate - find or create tunnel matching given parameters
265 * @p: tunnel parameters
266 * @create: != 0 if allowed to create new tunnel if no match found
267 *
268 * Description:
269 * ip6_tnl_locate() first tries to locate an existing tunnel
270 * based on @parms. If this is unsuccessful, but @create is set a new
271 * tunnel device is created and registered for use.
272 *
273 * Return:
274 * matching tunnel or NULL
275 **/
276
277 static struct ip6_tnl *ip6_tnl_locate(struct ip6_tnl_parm *p, int create)
278 {
279 struct in6_addr *remote = &p->raddr;
280 struct in6_addr *local = &p->laddr;
281 struct ip6_tnl *t;
282
283 for (t = *ip6_tnl_bucket(p); t; t = t->next) {
284 if (ipv6_addr_equal(local, &t->parms.laddr) &&
285 ipv6_addr_equal(remote, &t->parms.raddr))
286 return t;
287 }
288 if (!create)
289 return NULL;
290 return ip6_tnl_create(p);
291 }
292
293 /**
294 * ip6_tnl_dev_uninit - tunnel device uninitializer
295 * @dev: the device to be destroyed
296 *
297 * Description:
298 * ip6_tnl_dev_uninit() removes tunnel from its list
299 **/
300
301 static void
302 ip6_tnl_dev_uninit(struct net_device *dev)
303 {
304 struct ip6_tnl *t = netdev_priv(dev);
305
306 if (dev == ip6_fb_tnl_dev) {
307 write_lock_bh(&ip6_tnl_lock);
308 tnls_wc[0] = NULL;
309 write_unlock_bh(&ip6_tnl_lock);
310 } else {
311 ip6_tnl_unlink(t);
312 }
313 ip6_tnl_dst_reset(t);
314 dev_put(dev);
315 }
316
317 /**
318 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
319 * @skb: received socket buffer
320 *
321 * Return:
322 * 0 if none was found,
323 * else index to encapsulation limit
324 **/
325
326 static __u16
327 parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
328 {
329 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
330 __u8 nexthdr = ipv6h->nexthdr;
331 __u16 off = sizeof (*ipv6h);
332
333 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
334 __u16 optlen = 0;
335 struct ipv6_opt_hdr *hdr;
336 if (raw + off + sizeof (*hdr) > skb->data &&
337 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
338 break;
339
340 hdr = (struct ipv6_opt_hdr *) (raw + off);
341 if (nexthdr == NEXTHDR_FRAGMENT) {
342 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
343 if (frag_hdr->frag_off)
344 break;
345 optlen = 8;
346 } else if (nexthdr == NEXTHDR_AUTH) {
347 optlen = (hdr->hdrlen + 2) << 2;
348 } else {
349 optlen = ipv6_optlen(hdr);
350 }
351 if (nexthdr == NEXTHDR_DEST) {
352 __u16 i = off + 2;
353 while (1) {
354 struct ipv6_tlv_tnl_enc_lim *tel;
355
356 /* No more room for encapsulation limit */
357 if (i + sizeof (*tel) > off + optlen)
358 break;
359
360 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
361 /* return index of option if found and valid */
362 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
363 tel->length == 1)
364 return i;
365 /* else jump to next option */
366 if (tel->type)
367 i += tel->length + 2;
368 else
369 i++;
370 }
371 }
372 nexthdr = hdr->nexthdr;
373 off += optlen;
374 }
375 return 0;
376 }
377
378 /**
379 * ip6_tnl_err - tunnel error handler
380 *
381 * Description:
382 * ip6_tnl_err() should handle errors in the tunnel according
383 * to the specifications in RFC 2473.
384 **/
385
386 static int
387 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
388 int *type, int *code, int *msg, __u32 *info, int offset)
389 {
390 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
391 struct ip6_tnl *t;
392 int rel_msg = 0;
393 int rel_type = ICMPV6_DEST_UNREACH;
394 int rel_code = ICMPV6_ADDR_UNREACH;
395 __u32 rel_info = 0;
396 __u16 len;
397 int err = -ENOENT;
398
399 /* If the packet doesn't contain the original IPv6 header we are
400 in trouble since we might need the source address for further
401 processing of the error. */
402
403 read_lock(&ip6_tnl_lock);
404 if ((t = ip6_tnl_lookup(&ipv6h->daddr, &ipv6h->saddr)) == NULL)
405 goto out;
406
407 if (t->parms.proto != ipproto && t->parms.proto != 0)
408 goto out;
409
410 err = 0;
411
412 switch (*type) {
413 __u32 teli;
414 struct ipv6_tlv_tnl_enc_lim *tel;
415 __u32 mtu;
416 case ICMPV6_DEST_UNREACH:
417 if (net_ratelimit())
418 printk(KERN_WARNING
419 "%s: Path to destination invalid "
420 "or inactive!\n", t->parms.name);
421 rel_msg = 1;
422 break;
423 case ICMPV6_TIME_EXCEED:
424 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
425 if (net_ratelimit())
426 printk(KERN_WARNING
427 "%s: Too small hop limit or "
428 "routing loop in tunnel!\n",
429 t->parms.name);
430 rel_msg = 1;
431 }
432 break;
433 case ICMPV6_PARAMPROB:
434 teli = 0;
435 if ((*code) == ICMPV6_HDR_FIELD)
436 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
437
438 if (teli && teli == *info - 2) {
439 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
440 if (tel->encap_limit == 0) {
441 if (net_ratelimit())
442 printk(KERN_WARNING
443 "%s: Too small encapsulation "
444 "limit or routing loop in "
445 "tunnel!\n", t->parms.name);
446 rel_msg = 1;
447 }
448 } else if (net_ratelimit()) {
449 printk(KERN_WARNING
450 "%s: Recipient unable to parse tunneled "
451 "packet!\n ", t->parms.name);
452 }
453 break;
454 case ICMPV6_PKT_TOOBIG:
455 mtu = *info - offset;
456 if (mtu < IPV6_MIN_MTU)
457 mtu = IPV6_MIN_MTU;
458 t->dev->mtu = mtu;
459
460 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
461 rel_type = ICMPV6_PKT_TOOBIG;
462 rel_code = 0;
463 rel_info = mtu;
464 rel_msg = 1;
465 }
466 break;
467 }
468
469 *type = rel_type;
470 *code = rel_code;
471 *info = rel_info;
472 *msg = rel_msg;
473
474 out:
475 read_unlock(&ip6_tnl_lock);
476 return err;
477 }
478
479 static int
480 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
481 int type, int code, int offset, __be32 info)
482 {
483 int rel_msg = 0;
484 int rel_type = type;
485 int rel_code = code;
486 __u32 rel_info = ntohl(info);
487 int err;
488 struct sk_buff *skb2;
489 struct iphdr *eiph;
490 struct flowi fl;
491 struct rtable *rt;
492
493 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
494 &rel_msg, &rel_info, offset);
495 if (err < 0)
496 return err;
497
498 if (rel_msg == 0)
499 return 0;
500
501 switch (rel_type) {
502 case ICMPV6_DEST_UNREACH:
503 if (rel_code != ICMPV6_ADDR_UNREACH)
504 return 0;
505 rel_type = ICMP_DEST_UNREACH;
506 rel_code = ICMP_HOST_UNREACH;
507 break;
508 case ICMPV6_PKT_TOOBIG:
509 if (rel_code != 0)
510 return 0;
511 rel_type = ICMP_DEST_UNREACH;
512 rel_code = ICMP_FRAG_NEEDED;
513 break;
514 default:
515 return 0;
516 }
517
518 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
519 return 0;
520
521 skb2 = skb_clone(skb, GFP_ATOMIC);
522 if (!skb2)
523 return 0;
524
525 dst_release(skb2->dst);
526 skb2->dst = NULL;
527 skb_pull(skb2, offset);
528 skb_reset_network_header(skb2);
529 eiph = ip_hdr(skb2);
530
531 /* Try to guess incoming interface */
532 memset(&fl, 0, sizeof(fl));
533 fl.fl4_dst = eiph->saddr;
534 fl.fl4_tos = RT_TOS(eiph->tos);
535 fl.proto = IPPROTO_IPIP;
536 if (ip_route_output_key(&rt, &fl))
537 goto out;
538
539 skb2->dev = rt->u.dst.dev;
540
541 /* route "incoming" packet */
542 if (rt->rt_flags & RTCF_LOCAL) {
543 ip_rt_put(rt);
544 rt = NULL;
545 fl.fl4_dst = eiph->daddr;
546 fl.fl4_src = eiph->saddr;
547 fl.fl4_tos = eiph->tos;
548 if (ip_route_output_key(&rt, &fl) ||
549 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
550 ip_rt_put(rt);
551 goto out;
552 }
553 } else {
554 ip_rt_put(rt);
555 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
556 skb2->dev) ||
557 skb2->dst->dev->type != ARPHRD_TUNNEL)
558 goto out;
559 }
560
561 /* change mtu on this route */
562 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
563 if (rel_info > dst_mtu(skb2->dst))
564 goto out;
565
566 skb2->dst->ops->update_pmtu(skb2->dst, rel_info);
567 }
568
569 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
570
571 out:
572 kfree_skb(skb2);
573 return 0;
574 }
575
576 static int
577 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
578 int type, int code, int offset, __be32 info)
579 {
580 int rel_msg = 0;
581 int rel_type = type;
582 int rel_code = code;
583 __u32 rel_info = ntohl(info);
584 int err;
585
586 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
587 &rel_msg, &rel_info, offset);
588 if (err < 0)
589 return err;
590
591 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
592 struct rt6_info *rt;
593 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
594
595 if (!skb2)
596 return 0;
597
598 dst_release(skb2->dst);
599 skb2->dst = NULL;
600 skb_pull(skb2, offset);
601 skb_reset_network_header(skb2);
602
603 /* Try to guess incoming interface */
604 rt = rt6_lookup(&ipv6_hdr(skb2)->saddr, NULL, 0, 0);
605
606 if (rt && rt->rt6i_dev)
607 skb2->dev = rt->rt6i_dev;
608
609 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
610
611 if (rt)
612 dst_release(&rt->u.dst);
613
614 kfree_skb(skb2);
615 }
616
617 return 0;
618 }
619
620 static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
621 struct ipv6hdr *ipv6h,
622 struct sk_buff *skb)
623 {
624 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
625
626 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
627 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
628
629 if (INET_ECN_is_ce(dsfield))
630 IP_ECN_set_ce(ip_hdr(skb));
631 }
632
633 static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
634 struct ipv6hdr *ipv6h,
635 struct sk_buff *skb)
636 {
637 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
638 ipv6_copy_dscp(ipv6h, ipv6_hdr(skb));
639
640 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
641 IP6_ECN_set_ce(ipv6_hdr(skb));
642 }
643
644 static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
645 {
646 struct ip6_tnl_parm *p = &t->parms;
647 int ret = 0;
648
649 if (p->flags & IP6_TNL_F_CAP_RCV) {
650 struct net_device *ldev = NULL;
651
652 if (p->link)
653 ldev = dev_get_by_index(&init_net, p->link);
654
655 if ((ipv6_addr_is_multicast(&p->laddr) ||
656 likely(ipv6_chk_addr(&p->laddr, ldev, 0))) &&
657 likely(!ipv6_chk_addr(&p->raddr, NULL, 0)))
658 ret = 1;
659
660 if (ldev)
661 dev_put(ldev);
662 }
663 return ret;
664 }
665
666 /**
667 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
668 * @skb: received socket buffer
669 * @protocol: ethernet protocol ID
670 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
671 *
672 * Return: 0
673 **/
674
675 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
676 __u8 ipproto,
677 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
678 struct ipv6hdr *ipv6h,
679 struct sk_buff *skb))
680 {
681 struct ip6_tnl *t;
682 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
683
684 read_lock(&ip6_tnl_lock);
685
686 if ((t = ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) {
687 if (t->parms.proto != ipproto && t->parms.proto != 0) {
688 read_unlock(&ip6_tnl_lock);
689 goto discard;
690 }
691
692 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
693 read_unlock(&ip6_tnl_lock);
694 goto discard;
695 }
696
697 if (!ip6_tnl_rcv_ctl(t)) {
698 t->stat.rx_dropped++;
699 read_unlock(&ip6_tnl_lock);
700 goto discard;
701 }
702 secpath_reset(skb);
703 skb->mac_header = skb->network_header;
704 skb_reset_network_header(skb);
705 skb->protocol = htons(protocol);
706 skb->pkt_type = PACKET_HOST;
707 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
708 skb->dev = t->dev;
709 dst_release(skb->dst);
710 skb->dst = NULL;
711 nf_reset(skb);
712
713 dscp_ecn_decapsulate(t, ipv6h, skb);
714
715 t->stat.rx_packets++;
716 t->stat.rx_bytes += skb->len;
717 netif_rx(skb);
718 read_unlock(&ip6_tnl_lock);
719 return 0;
720 }
721 read_unlock(&ip6_tnl_lock);
722 return 1;
723
724 discard:
725 kfree_skb(skb);
726 return 0;
727 }
728
729 static int ip4ip6_rcv(struct sk_buff *skb)
730 {
731 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
732 ip4ip6_dscp_ecn_decapsulate);
733 }
734
735 static int ip6ip6_rcv(struct sk_buff *skb)
736 {
737 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
738 ip6ip6_dscp_ecn_decapsulate);
739 }
740
741 struct ipv6_tel_txoption {
742 struct ipv6_txoptions ops;
743 __u8 dst_opt[8];
744 };
745
746 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
747 {
748 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
749
750 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
751 opt->dst_opt[3] = 1;
752 opt->dst_opt[4] = encap_limit;
753 opt->dst_opt[5] = IPV6_TLV_PADN;
754 opt->dst_opt[6] = 1;
755
756 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
757 opt->ops.opt_nflen = 8;
758 }
759
760 /**
761 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
762 * @t: the outgoing tunnel device
763 * @hdr: IPv6 header from the incoming packet
764 *
765 * Description:
766 * Avoid trivial tunneling loop by checking that tunnel exit-point
767 * doesn't match source of incoming packet.
768 *
769 * Return:
770 * 1 if conflict,
771 * 0 else
772 **/
773
774 static inline int
775 ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
776 {
777 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
778 }
779
780 static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
781 {
782 struct ip6_tnl_parm *p = &t->parms;
783 int ret = 0;
784
785 if (p->flags & IP6_TNL_F_CAP_XMIT) {
786 struct net_device *ldev = NULL;
787
788 if (p->link)
789 ldev = dev_get_by_index(&init_net, p->link);
790
791 if (unlikely(!ipv6_chk_addr(&p->laddr, ldev, 0)))
792 printk(KERN_WARNING
793 "%s xmit: Local address not yet configured!\n",
794 p->name);
795 else if (!ipv6_addr_is_multicast(&p->raddr) &&
796 unlikely(ipv6_chk_addr(&p->raddr, NULL, 0)))
797 printk(KERN_WARNING
798 "%s xmit: Routing loop! "
799 "Remote address found on this node!\n",
800 p->name);
801 else
802 ret = 1;
803 if (ldev)
804 dev_put(ldev);
805 }
806 return ret;
807 }
808 /**
809 * ip6_tnl_xmit2 - encapsulate packet and send
810 * @skb: the outgoing socket buffer
811 * @dev: the outgoing tunnel device
812 * @dsfield: dscp code for outer header
813 * @fl: flow of tunneled packet
814 * @encap_limit: encapsulation limit
815 * @pmtu: Path MTU is stored if packet is too big
816 *
817 * Description:
818 * Build new header and do some sanity checks on the packet before sending
819 * it.
820 *
821 * Return:
822 * 0 on success
823 * -1 fail
824 * %-EMSGSIZE message too big. return mtu in this case.
825 **/
826
827 static int ip6_tnl_xmit2(struct sk_buff *skb,
828 struct net_device *dev,
829 __u8 dsfield,
830 struct flowi *fl,
831 int encap_limit,
832 __u32 *pmtu)
833 {
834 struct ip6_tnl *t = netdev_priv(dev);
835 struct net_device_stats *stats = &t->stat;
836 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
837 struct ipv6_tel_txoption opt;
838 struct dst_entry *dst;
839 struct net_device *tdev;
840 int mtu;
841 int max_headroom = sizeof(struct ipv6hdr);
842 u8 proto;
843 int err = -1;
844 int pkt_len;
845
846 if ((dst = ip6_tnl_dst_check(t)) != NULL)
847 dst_hold(dst);
848 else {
849 dst = ip6_route_output(NULL, fl);
850
851 if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0)
852 goto tx_err_link_failure;
853 }
854
855 tdev = dst->dev;
856
857 if (tdev == dev) {
858 stats->collisions++;
859 if (net_ratelimit())
860 printk(KERN_WARNING
861 "%s: Local routing loop detected!\n",
862 t->parms.name);
863 goto tx_err_dst_release;
864 }
865 mtu = dst_mtu(dst) - sizeof (*ipv6h);
866 if (encap_limit >= 0) {
867 max_headroom += 8;
868 mtu -= 8;
869 }
870 if (mtu < IPV6_MIN_MTU)
871 mtu = IPV6_MIN_MTU;
872 if (skb->dst)
873 skb->dst->ops->update_pmtu(skb->dst, mtu);
874 if (skb->len > mtu) {
875 *pmtu = mtu;
876 err = -EMSGSIZE;
877 goto tx_err_dst_release;
878 }
879
880 /*
881 * Okay, now see if we can stuff it in the buffer as-is.
882 */
883 max_headroom += LL_RESERVED_SPACE(tdev);
884
885 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
886 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
887 struct sk_buff *new_skb;
888
889 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
890 goto tx_err_dst_release;
891
892 if (skb->sk)
893 skb_set_owner_w(new_skb, skb->sk);
894 kfree_skb(skb);
895 skb = new_skb;
896 }
897 dst_release(skb->dst);
898 skb->dst = dst_clone(dst);
899
900 skb->transport_header = skb->network_header;
901
902 proto = fl->proto;
903 if (encap_limit >= 0) {
904 init_tel_txopt(&opt, encap_limit);
905 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
906 }
907 skb_push(skb, sizeof(struct ipv6hdr));
908 skb_reset_network_header(skb);
909 ipv6h = ipv6_hdr(skb);
910 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
911 dsfield = INET_ECN_encapsulate(0, dsfield);
912 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
913 ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
914 ipv6h->hop_limit = t->parms.hop_limit;
915 ipv6h->nexthdr = proto;
916 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
917 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
918 nf_reset(skb);
919 pkt_len = skb->len;
920 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL,
921 skb->dst->dev, dst_output);
922
923 if (net_xmit_eval(err) == 0) {
924 stats->tx_bytes += pkt_len;
925 stats->tx_packets++;
926 } else {
927 stats->tx_errors++;
928 stats->tx_aborted_errors++;
929 }
930 ip6_tnl_dst_store(t, dst);
931 return 0;
932 tx_err_link_failure:
933 stats->tx_carrier_errors++;
934 dst_link_failure(skb);
935 tx_err_dst_release:
936 dst_release(dst);
937 return err;
938 }
939
940 static inline int
941 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
942 {
943 struct ip6_tnl *t = netdev_priv(dev);
944 struct iphdr *iph = ip_hdr(skb);
945 int encap_limit = -1;
946 struct flowi fl;
947 __u8 dsfield;
948 __u32 mtu;
949 int err;
950
951 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
952 !ip6_tnl_xmit_ctl(t))
953 return -1;
954
955 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
956 encap_limit = t->parms.encap_limit;
957
958 memcpy(&fl, &t->fl, sizeof (fl));
959 fl.proto = IPPROTO_IPIP;
960
961 dsfield = ipv4_get_dsfield(iph);
962
963 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
964 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
965 & IPV6_TCLASS_MASK;
966
967 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
968 if (err != 0) {
969 /* XXX: send ICMP error even if DF is not set. */
970 if (err == -EMSGSIZE)
971 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
972 htonl(mtu));
973 return -1;
974 }
975
976 return 0;
977 }
978
979 static inline int
980 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
981 {
982 struct ip6_tnl *t = netdev_priv(dev);
983 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
984 int encap_limit = -1;
985 __u16 offset;
986 struct flowi fl;
987 __u8 dsfield;
988 __u32 mtu;
989 int err;
990
991 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
992 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
993 return -1;
994
995 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
996 if (offset > 0) {
997 struct ipv6_tlv_tnl_enc_lim *tel;
998 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
999 if (tel->encap_limit == 0) {
1000 icmpv6_send(skb, ICMPV6_PARAMPROB,
1001 ICMPV6_HDR_FIELD, offset + 2, skb->dev);
1002 return -1;
1003 }
1004 encap_limit = tel->encap_limit - 1;
1005 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1006 encap_limit = t->parms.encap_limit;
1007
1008 memcpy(&fl, &t->fl, sizeof (fl));
1009 fl.proto = IPPROTO_IPV6;
1010
1011 dsfield = ipv6_get_dsfield(ipv6h);
1012 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1013 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1014 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1015 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1016
1017 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
1018 if (err != 0) {
1019 if (err == -EMSGSIZE)
1020 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1021 return -1;
1022 }
1023
1024 return 0;
1025 }
1026
1027 static int
1028 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1029 {
1030 struct ip6_tnl *t = netdev_priv(dev);
1031 struct net_device_stats *stats = &t->stat;
1032 int ret;
1033
1034 if (t->recursion++) {
1035 t->stat.collisions++;
1036 goto tx_err;
1037 }
1038
1039 switch (skb->protocol) {
1040 case __constant_htons(ETH_P_IP):
1041 ret = ip4ip6_tnl_xmit(skb, dev);
1042 break;
1043 case __constant_htons(ETH_P_IPV6):
1044 ret = ip6ip6_tnl_xmit(skb, dev);
1045 break;
1046 default:
1047 goto tx_err;
1048 }
1049
1050 if (ret < 0)
1051 goto tx_err;
1052
1053 t->recursion--;
1054 return 0;
1055
1056 tx_err:
1057 stats->tx_errors++;
1058 stats->tx_dropped++;
1059 kfree_skb(skb);
1060 t->recursion--;
1061 return 0;
1062 }
1063
1064 static void ip6_tnl_set_cap(struct ip6_tnl *t)
1065 {
1066 struct ip6_tnl_parm *p = &t->parms;
1067 int ltype = ipv6_addr_type(&p->laddr);
1068 int rtype = ipv6_addr_type(&p->raddr);
1069
1070 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1071
1072 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1073 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1074 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
1075 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
1076 if (ltype&IPV6_ADDR_UNICAST)
1077 p->flags |= IP6_TNL_F_CAP_XMIT;
1078 if (rtype&IPV6_ADDR_UNICAST)
1079 p->flags |= IP6_TNL_F_CAP_RCV;
1080 }
1081 }
1082
1083 static void ip6_tnl_link_config(struct ip6_tnl *t)
1084 {
1085 struct net_device *dev = t->dev;
1086 struct ip6_tnl_parm *p = &t->parms;
1087 struct flowi *fl = &t->fl;
1088
1089 memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1090 memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1091
1092 /* Set up flowi template */
1093 ipv6_addr_copy(&fl->fl6_src, &p->laddr);
1094 ipv6_addr_copy(&fl->fl6_dst, &p->raddr);
1095 fl->oif = p->link;
1096 fl->fl6_flowlabel = 0;
1097
1098 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1099 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1100 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1101 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1102
1103 ip6_tnl_set_cap(t);
1104
1105 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1106 dev->flags |= IFF_POINTOPOINT;
1107 else
1108 dev->flags &= ~IFF_POINTOPOINT;
1109
1110 dev->iflink = p->link;
1111
1112 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1113 int strict = (ipv6_addr_type(&p->raddr) &
1114 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1115
1116 struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr,
1117 p->link, strict);
1118
1119 if (rt == NULL)
1120 return;
1121
1122 if (rt->rt6i_dev) {
1123 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1124 sizeof (struct ipv6hdr);
1125
1126 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1127
1128 if (dev->mtu < IPV6_MIN_MTU)
1129 dev->mtu = IPV6_MIN_MTU;
1130 }
1131 dst_release(&rt->u.dst);
1132 }
1133 }
1134
1135 /**
1136 * ip6_tnl_change - update the tunnel parameters
1137 * @t: tunnel to be changed
1138 * @p: tunnel configuration parameters
1139 * @active: != 0 if tunnel is ready for use
1140 *
1141 * Description:
1142 * ip6_tnl_change() updates the tunnel parameters
1143 **/
1144
1145 static int
1146 ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
1147 {
1148 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1149 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1150 t->parms.flags = p->flags;
1151 t->parms.hop_limit = p->hop_limit;
1152 t->parms.encap_limit = p->encap_limit;
1153 t->parms.flowinfo = p->flowinfo;
1154 t->parms.link = p->link;
1155 t->parms.proto = p->proto;
1156 ip6_tnl_dst_reset(t);
1157 ip6_tnl_link_config(t);
1158 return 0;
1159 }
1160
1161 /**
1162 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1163 * @dev: virtual device associated with tunnel
1164 * @ifr: parameters passed from userspace
1165 * @cmd: command to be performed
1166 *
1167 * Description:
1168 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1169 * from userspace.
1170 *
1171 * The possible commands are the following:
1172 * %SIOCGETTUNNEL: get tunnel parameters for device
1173 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1174 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1175 * %SIOCDELTUNNEL: delete tunnel
1176 *
1177 * The fallback device "ip6tnl0", created during module
1178 * initialization, can be used for creating other tunnel devices.
1179 *
1180 * Return:
1181 * 0 on success,
1182 * %-EFAULT if unable to copy data to or from userspace,
1183 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1184 * %-EINVAL if passed tunnel parameters are invalid,
1185 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1186 * %-ENODEV if attempting to change or delete a nonexisting device
1187 **/
1188
1189 static int
1190 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1191 {
1192 int err = 0;
1193 struct ip6_tnl_parm p;
1194 struct ip6_tnl *t = NULL;
1195
1196 switch (cmd) {
1197 case SIOCGETTUNNEL:
1198 if (dev == ip6_fb_tnl_dev) {
1199 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1200 err = -EFAULT;
1201 break;
1202 }
1203 t = ip6_tnl_locate(&p, 0);
1204 }
1205 if (t == NULL)
1206 t = netdev_priv(dev);
1207 memcpy(&p, &t->parms, sizeof (p));
1208 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1209 err = -EFAULT;
1210 }
1211 break;
1212 case SIOCADDTUNNEL:
1213 case SIOCCHGTUNNEL:
1214 err = -EPERM;
1215 if (!capable(CAP_NET_ADMIN))
1216 break;
1217 err = -EFAULT;
1218 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1219 break;
1220 err = -EINVAL;
1221 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1222 p.proto != 0)
1223 break;
1224 t = ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL);
1225 if (dev != ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1226 if (t != NULL) {
1227 if (t->dev != dev) {
1228 err = -EEXIST;
1229 break;
1230 }
1231 } else
1232 t = netdev_priv(dev);
1233
1234 ip6_tnl_unlink(t);
1235 err = ip6_tnl_change(t, &p);
1236 ip6_tnl_link(t);
1237 netdev_state_change(dev);
1238 }
1239 if (t) {
1240 err = 0;
1241 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1242 err = -EFAULT;
1243
1244 } else
1245 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1246 break;
1247 case SIOCDELTUNNEL:
1248 err = -EPERM;
1249 if (!capable(CAP_NET_ADMIN))
1250 break;
1251
1252 if (dev == ip6_fb_tnl_dev) {
1253 err = -EFAULT;
1254 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1255 break;
1256 err = -ENOENT;
1257 if ((t = ip6_tnl_locate(&p, 0)) == NULL)
1258 break;
1259 err = -EPERM;
1260 if (t->dev == ip6_fb_tnl_dev)
1261 break;
1262 dev = t->dev;
1263 }
1264 err = 0;
1265 unregister_netdevice(dev);
1266 break;
1267 default:
1268 err = -EINVAL;
1269 }
1270 return err;
1271 }
1272
1273 /**
1274 * ip6_tnl_get_stats - return the stats for tunnel device
1275 * @dev: virtual device associated with tunnel
1276 *
1277 * Return: stats for device
1278 **/
1279
1280 static struct net_device_stats *
1281 ip6_tnl_get_stats(struct net_device *dev)
1282 {
1283 return &(((struct ip6_tnl *)netdev_priv(dev))->stat);
1284 }
1285
1286 /**
1287 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1288 * @dev: virtual device associated with tunnel
1289 * @new_mtu: the new mtu
1290 *
1291 * Return:
1292 * 0 on success,
1293 * %-EINVAL if mtu too small
1294 **/
1295
1296 static int
1297 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1298 {
1299 if (new_mtu < IPV6_MIN_MTU) {
1300 return -EINVAL;
1301 }
1302 dev->mtu = new_mtu;
1303 return 0;
1304 }
1305
1306 /**
1307 * ip6_tnl_dev_setup - setup virtual tunnel device
1308 * @dev: virtual device associated with tunnel
1309 *
1310 * Description:
1311 * Initialize function pointers and device parameters
1312 **/
1313
1314 static void ip6_tnl_dev_setup(struct net_device *dev)
1315 {
1316 dev->uninit = ip6_tnl_dev_uninit;
1317 dev->destructor = free_netdev;
1318 dev->hard_start_xmit = ip6_tnl_xmit;
1319 dev->get_stats = ip6_tnl_get_stats;
1320 dev->do_ioctl = ip6_tnl_ioctl;
1321 dev->change_mtu = ip6_tnl_change_mtu;
1322
1323 dev->type = ARPHRD_TUNNEL6;
1324 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1325 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1326 dev->flags |= IFF_NOARP;
1327 dev->addr_len = sizeof(struct in6_addr);
1328 }
1329
1330
1331 /**
1332 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1333 * @dev: virtual device associated with tunnel
1334 **/
1335
1336 static inline void
1337 ip6_tnl_dev_init_gen(struct net_device *dev)
1338 {
1339 struct ip6_tnl *t = netdev_priv(dev);
1340 t->dev = dev;
1341 strcpy(t->parms.name, dev->name);
1342 }
1343
1344 /**
1345 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1346 * @dev: virtual device associated with tunnel
1347 **/
1348
1349 static int
1350 ip6_tnl_dev_init(struct net_device *dev)
1351 {
1352 struct ip6_tnl *t = netdev_priv(dev);
1353 ip6_tnl_dev_init_gen(dev);
1354 ip6_tnl_link_config(t);
1355 return 0;
1356 }
1357
1358 /**
1359 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1360 * @dev: fallback device
1361 *
1362 * Return: 0
1363 **/
1364
1365 static int
1366 ip6_fb_tnl_dev_init(struct net_device *dev)
1367 {
1368 struct ip6_tnl *t = netdev_priv(dev);
1369 ip6_tnl_dev_init_gen(dev);
1370 t->parms.proto = IPPROTO_IPV6;
1371 dev_hold(dev);
1372 tnls_wc[0] = t;
1373 return 0;
1374 }
1375
1376 static struct xfrm6_tunnel ip4ip6_handler = {
1377 .handler = ip4ip6_rcv,
1378 .err_handler = ip4ip6_err,
1379 .priority = 1,
1380 };
1381
1382 static struct xfrm6_tunnel ip6ip6_handler = {
1383 .handler = ip6ip6_rcv,
1384 .err_handler = ip6ip6_err,
1385 .priority = 1,
1386 };
1387
1388 /**
1389 * ip6_tunnel_init - register protocol and reserve needed resources
1390 *
1391 * Return: 0 on success
1392 **/
1393
1394 static int __init ip6_tunnel_init(void)
1395 {
1396 int err;
1397
1398 if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) {
1399 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1400 err = -EAGAIN;
1401 goto out;
1402 }
1403
1404 if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) {
1405 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1406 err = -EAGAIN;
1407 goto unreg_ip4ip6;
1408 }
1409 ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1410 ip6_tnl_dev_setup);
1411
1412 if (!ip6_fb_tnl_dev) {
1413 err = -ENOMEM;
1414 goto fail;
1415 }
1416 ip6_fb_tnl_dev->init = ip6_fb_tnl_dev_init;
1417
1418 if ((err = register_netdev(ip6_fb_tnl_dev))) {
1419 free_netdev(ip6_fb_tnl_dev);
1420 goto fail;
1421 }
1422 return 0;
1423 fail:
1424 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1425 unreg_ip4ip6:
1426 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1427 out:
1428 return err;
1429 }
1430
1431 static void __exit ip6_tnl_destroy_tunnels(void)
1432 {
1433 int h;
1434 struct ip6_tnl *t;
1435
1436 for (h = 0; h < HASH_SIZE; h++) {
1437 while ((t = tnls_r_l[h]) != NULL)
1438 unregister_netdevice(t->dev);
1439 }
1440
1441 t = tnls_wc[0];
1442 unregister_netdevice(t->dev);
1443 }
1444
1445 /**
1446 * ip6_tunnel_cleanup - free resources and unregister protocol
1447 **/
1448
1449 static void __exit ip6_tunnel_cleanup(void)
1450 {
1451 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1452 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
1453
1454 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1455 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
1456
1457 rtnl_lock();
1458 ip6_tnl_destroy_tunnels();
1459 rtnl_unlock();
1460 }
1461
1462 module_init(ip6_tunnel_init);
1463 module_exit(ip6_tunnel_cleanup);
kernel source for telekom puls (alcatel/mediatek)