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 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21 #include <linux/module.h>
22 #include <linux/capability.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/sockios.h>
26 #include <linux/icmp.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/icmp.h>
45 #include <net/ip.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/xfrm.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55
56 MODULE_AUTHOR("Ville Nuorvala");
57 MODULE_DESCRIPTION("IPv6 tunneling device");
58 MODULE_LICENSE("GPL");
59 MODULE_ALIAS_NETDEV("ip6tnl0");
60
61 #define IPV6_TLV_TEL_DST_SIZE 8
62
63 #ifdef IP6_TNL_DEBUG
64 #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
65 #else
66 #define IP6_TNL_TRACE(x...) do {;} while(0)
67 #endif
68
69 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
70 #define IPV6_TCLASS_SHIFT 20
71
72 #define HASH_SIZE 32
73
74 #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
75 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
76 (HASH_SIZE - 1))
77
78 static void ip6_fb_tnl_dev_init(struct net_device *dev);
79 static void ip6_tnl_dev_init(struct net_device *dev);
80 static void ip6_tnl_dev_setup(struct net_device *dev);
81
82 static int ip6_tnl_net_id;
83 struct ip6_tnl_net {
84 /* the IPv6 tunnel fallback device */
85 struct net_device *fb_tnl_dev;
86 /* lists for storing tunnels in use */
87 struct ip6_tnl *tnls_r_l[HASH_SIZE];
88 struct ip6_tnl *tnls_wc[1];
89 struct ip6_tnl **tnls[2];
90 };
91
92 /* lock for the tunnel lists */
93 static DEFINE_RWLOCK(ip6_tnl_lock);
94
95 static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
96 {
97 struct dst_entry *dst = t->dst_cache;
98
99 if (dst && dst->obsolete &&
100 dst->ops->check(dst, t->dst_cookie) == NULL) {
101 t->dst_cache = NULL;
102 dst_release(dst);
103 return NULL;
104 }
105
106 return dst;
107 }
108
109 static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
110 {
111 dst_release(t->dst_cache);
112 t->dst_cache = NULL;
113 }
114
115 static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
116 {
117 struct rt6_info *rt = (struct rt6_info *) dst;
118 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
119 dst_release(t->dst_cache);
120 t->dst_cache = dst;
121 }
122
123 /**
124 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
125 * @remote: the address of the tunnel exit-point
126 * @local: the address of the tunnel entry-point
127 *
128 * Return:
129 * tunnel matching given end-points if found,
130 * else fallback tunnel if its device is up,
131 * else %NULL
132 **/
133
134 static struct ip6_tnl *
135 ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local)
136 {
137 unsigned h0 = HASH(remote);
138 unsigned h1 = HASH(local);
139 struct ip6_tnl *t;
140 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
141
142 for (t = ip6n->tnls_r_l[h0 ^ h1]; t; t = t->next) {
143 if (ipv6_addr_equal(local, &t->parms.laddr) &&
144 ipv6_addr_equal(remote, &t->parms.raddr) &&
145 (t->dev->flags & IFF_UP))
146 return t;
147 }
148 if ((t = ip6n->tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP))
149 return t;
150
151 return NULL;
152 }
153
154 /**
155 * ip6_tnl_bucket - get head of list matching given tunnel parameters
156 * @p: parameters containing tunnel end-points
157 *
158 * Description:
159 * ip6_tnl_bucket() returns the head of the list matching the
160 * &struct in6_addr entries laddr and raddr in @p.
161 *
162 * Return: head of IPv6 tunnel list
163 **/
164
165 static struct ip6_tnl **
166 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p)
167 {
168 struct in6_addr *remote = &p->raddr;
169 struct in6_addr *local = &p->laddr;
170 unsigned h = 0;
171 int prio = 0;
172
173 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
174 prio = 1;
175 h = HASH(remote) ^ HASH(local);
176 }
177 return &ip6n->tnls[prio][h];
178 }
179
180 /**
181 * ip6_tnl_link - add tunnel to hash table
182 * @t: tunnel to be added
183 **/
184
185 static void
186 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
187 {
188 struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms);
189
190 t->next = *tp;
191 write_lock_bh(&ip6_tnl_lock);
192 *tp = t;
193 write_unlock_bh(&ip6_tnl_lock);
194 }
195
196 /**
197 * ip6_tnl_unlink - remove tunnel from hash table
198 * @t: tunnel to be removed
199 **/
200
201 static void
202 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
203 {
204 struct ip6_tnl **tp;
205
206 for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) {
207 if (t == *tp) {
208 write_lock_bh(&ip6_tnl_lock);
209 *tp = t->next;
210 write_unlock_bh(&ip6_tnl_lock);
211 break;
212 }
213 }
214 }
215
216 /**
217 * ip6_tnl_create() - create a new tunnel
218 * @p: tunnel parameters
219 * @pt: pointer to new tunnel
220 *
221 * Description:
222 * Create tunnel matching given parameters.
223 *
224 * Return:
225 * created tunnel or NULL
226 **/
227
228 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
229 {
230 struct net_device *dev;
231 struct ip6_tnl *t;
232 char name[IFNAMSIZ];
233 int err;
234 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
235
236 if (p->name[0])
237 strlcpy(name, p->name, IFNAMSIZ);
238 else
239 sprintf(name, "ip6tnl%%d");
240
241 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
242 if (dev == NULL)
243 goto failed;
244
245 dev_net_set(dev, net);
246
247 if (strchr(name, '%')) {
248 if (dev_alloc_name(dev, name) < 0)
249 goto failed_free;
250 }
251
252 t = netdev_priv(dev);
253 t->parms = *p;
254 ip6_tnl_dev_init(dev);
255
256 if ((err = register_netdevice(dev)) < 0)
257 goto failed_free;
258
259 dev_hold(dev);
260 ip6_tnl_link(ip6n, t);
261 return t;
262
263 failed_free:
264 free_netdev(dev);
265 failed:
266 return NULL;
267 }
268
269 /**
270 * ip6_tnl_locate - find or create tunnel matching given parameters
271 * @p: tunnel parameters
272 * @create: != 0 if allowed to create new tunnel if no match found
273 *
274 * Description:
275 * ip6_tnl_locate() first tries to locate an existing tunnel
276 * based on @parms. If this is unsuccessful, but @create is set a new
277 * tunnel device is created and registered for use.
278 *
279 * Return:
280 * matching tunnel or NULL
281 **/
282
283 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
284 struct ip6_tnl_parm *p, int create)
285 {
286 struct in6_addr *remote = &p->raddr;
287 struct in6_addr *local = &p->laddr;
288 struct ip6_tnl *t;
289 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
290
291 for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) {
292 if (ipv6_addr_equal(local, &t->parms.laddr) &&
293 ipv6_addr_equal(remote, &t->parms.raddr))
294 return t;
295 }
296 if (!create)
297 return NULL;
298 return ip6_tnl_create(net, p);
299 }
300
301 /**
302 * ip6_tnl_dev_uninit - tunnel device uninitializer
303 * @dev: the device to be destroyed
304 *
305 * Description:
306 * ip6_tnl_dev_uninit() removes tunnel from its list
307 **/
308
309 static void
310 ip6_tnl_dev_uninit(struct net_device *dev)
311 {
312 struct ip6_tnl *t = netdev_priv(dev);
313 struct net *net = dev_net(dev);
314 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
315
316 if (dev == ip6n->fb_tnl_dev) {
317 write_lock_bh(&ip6_tnl_lock);
318 ip6n->tnls_wc[0] = NULL;
319 write_unlock_bh(&ip6_tnl_lock);
320 } else {
321 ip6_tnl_unlink(ip6n, t);
322 }
323 ip6_tnl_dst_reset(t);
324 dev_put(dev);
325 }
326
327 /**
328 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
329 * @skb: received socket buffer
330 *
331 * Return:
332 * 0 if none was found,
333 * else index to encapsulation limit
334 **/
335
336 static __u16
337 parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
338 {
339 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw;
340 __u8 nexthdr = ipv6h->nexthdr;
341 __u16 off = sizeof (*ipv6h);
342
343 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
344 __u16 optlen = 0;
345 struct ipv6_opt_hdr *hdr;
346 if (raw + off + sizeof (*hdr) > skb->data &&
347 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
348 break;
349
350 hdr = (struct ipv6_opt_hdr *) (raw + off);
351 if (nexthdr == NEXTHDR_FRAGMENT) {
352 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
353 if (frag_hdr->frag_off)
354 break;
355 optlen = 8;
356 } else if (nexthdr == NEXTHDR_AUTH) {
357 optlen = (hdr->hdrlen + 2) << 2;
358 } else {
359 optlen = ipv6_optlen(hdr);
360 }
361 if (nexthdr == NEXTHDR_DEST) {
362 __u16 i = off + 2;
363 while (1) {
364 struct ipv6_tlv_tnl_enc_lim *tel;
365
366 /* No more room for encapsulation limit */
367 if (i + sizeof (*tel) > off + optlen)
368 break;
369
370 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
371 /* return index of option if found and valid */
372 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
373 tel->length == 1)
374 return i;
375 /* else jump to next option */
376 if (tel->type)
377 i += tel->length + 2;
378 else
379 i++;
380 }
381 }
382 nexthdr = hdr->nexthdr;
383 off += optlen;
384 }
385 return 0;
386 }
387
388 /**
389 * ip6_tnl_err - tunnel error handler
390 *
391 * Description:
392 * ip6_tnl_err() should handle errors in the tunnel according
393 * to the specifications in RFC 2473.
394 **/
395
396 static int
397 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
398 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
399 {
400 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data;
401 struct ip6_tnl *t;
402 int rel_msg = 0;
403 u8 rel_type = ICMPV6_DEST_UNREACH;
404 u8 rel_code = ICMPV6_ADDR_UNREACH;
405 __u32 rel_info = 0;
406 __u16 len;
407 int err = -ENOENT;
408
409 /* If the packet doesn't contain the original IPv6 header we are
410 in trouble since we might need the source address for further
411 processing of the error. */
412
413 read_lock(&ip6_tnl_lock);
414 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
415 &ipv6h->saddr)) == NULL)
416 goto out;
417
418 if (t->parms.proto != ipproto && t->parms.proto != 0)
419 goto out;
420
421 err = 0;
422
423 switch (*type) {
424 __u32 teli;
425 struct ipv6_tlv_tnl_enc_lim *tel;
426 __u32 mtu;
427 case ICMPV6_DEST_UNREACH:
428 if (net_ratelimit())
429 printk(KERN_WARNING
430 "%s: Path to destination invalid "
431 "or inactive!\n", t->parms.name);
432 rel_msg = 1;
433 break;
434 case ICMPV6_TIME_EXCEED:
435 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
436 if (net_ratelimit())
437 printk(KERN_WARNING
438 "%s: Too small hop limit or "
439 "routing loop in tunnel!\n",
440 t->parms.name);
441 rel_msg = 1;
442 }
443 break;
444 case ICMPV6_PARAMPROB:
445 teli = 0;
446 if ((*code) == ICMPV6_HDR_FIELD)
447 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
448
449 if (teli && teli == *info - 2) {
450 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
451 if (tel->encap_limit == 0) {
452 if (net_ratelimit())
453 printk(KERN_WARNING
454 "%s: Too small encapsulation "
455 "limit or routing loop in "
456 "tunnel!\n", t->parms.name);
457 rel_msg = 1;
458 }
459 } else if (net_ratelimit()) {
460 printk(KERN_WARNING
461 "%s: Recipient unable to parse tunneled "
462 "packet!\n ", t->parms.name);
463 }
464 break;
465 case ICMPV6_PKT_TOOBIG:
466 mtu = *info - offset;
467 if (mtu < IPV6_MIN_MTU)
468 mtu = IPV6_MIN_MTU;
469 t->dev->mtu = mtu;
470
471 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
472 rel_type = ICMPV6_PKT_TOOBIG;
473 rel_code = 0;
474 rel_info = mtu;
475 rel_msg = 1;
476 }
477 break;
478 }
479
480 *type = rel_type;
481 *code = rel_code;
482 *info = rel_info;
483 *msg = rel_msg;
484
485 out:
486 read_unlock(&ip6_tnl_lock);
487 return err;
488 }
489
490 static int
491 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
492 u8 type, u8 code, int offset, __be32 info)
493 {
494 int rel_msg = 0;
495 u8 rel_type = type;
496 u8 rel_code = code;
497 __u32 rel_info = ntohl(info);
498 int err;
499 struct sk_buff *skb2;
500 struct iphdr *eiph;
501 struct flowi fl;
502 struct rtable *rt;
503
504 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
505 &rel_msg, &rel_info, offset);
506 if (err < 0)
507 return err;
508
509 if (rel_msg == 0)
510 return 0;
511
512 switch (rel_type) {
513 case ICMPV6_DEST_UNREACH:
514 if (rel_code != ICMPV6_ADDR_UNREACH)
515 return 0;
516 rel_type = ICMP_DEST_UNREACH;
517 rel_code = ICMP_HOST_UNREACH;
518 break;
519 case ICMPV6_PKT_TOOBIG:
520 if (rel_code != 0)
521 return 0;
522 rel_type = ICMP_DEST_UNREACH;
523 rel_code = ICMP_FRAG_NEEDED;
524 break;
525 default:
526 return 0;
527 }
528
529 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
530 return 0;
531
532 skb2 = skb_clone(skb, GFP_ATOMIC);
533 if (!skb2)
534 return 0;
535
536 skb_dst_drop(skb2);
537
538 skb_pull(skb2, offset);
539 skb_reset_network_header(skb2);
540 eiph = ip_hdr(skb2);
541
542 /* Try to guess incoming interface */
543 memset(&fl, 0, sizeof(fl));
544 fl.fl4_dst = eiph->saddr;
545 fl.fl4_tos = RT_TOS(eiph->tos);
546 fl.proto = IPPROTO_IPIP;
547 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl))
548 goto out;
549
550 skb2->dev = rt->u.dst.dev;
551
552 /* route "incoming" packet */
553 if (rt->rt_flags & RTCF_LOCAL) {
554 ip_rt_put(rt);
555 rt = NULL;
556 fl.fl4_dst = eiph->daddr;
557 fl.fl4_src = eiph->saddr;
558 fl.fl4_tos = eiph->tos;
559 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) ||
560 rt->u.dst.dev->type != ARPHRD_TUNNEL) {
561 ip_rt_put(rt);
562 goto out;
563 }
564 skb_dst_set(skb2, (struct dst_entry *)rt);
565 } else {
566 ip_rt_put(rt);
567 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
568 skb2->dev) ||
569 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
570 goto out;
571 }
572
573 /* change mtu on this route */
574 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
575 if (rel_info > dst_mtu(skb_dst(skb2)))
576 goto out;
577
578 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
579 }
580
581 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
582
583 out:
584 kfree_skb(skb2);
585 return 0;
586 }
587
588 static int
589 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
590 u8 type, u8 code, int offset, __be32 info)
591 {
592 int rel_msg = 0;
593 u8 rel_type = type;
594 u8 rel_code = code;
595 __u32 rel_info = ntohl(info);
596 int err;
597
598 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
599 &rel_msg, &rel_info, offset);
600 if (err < 0)
601 return err;
602
603 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
604 struct rt6_info *rt;
605 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
606
607 if (!skb2)
608 return 0;
609
610 skb_dst_drop(skb2);
611 skb_pull(skb2, offset);
612 skb_reset_network_header(skb2);
613
614 /* Try to guess incoming interface */
615 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
616 NULL, 0, 0);
617
618 if (rt && rt->rt6i_dev)
619 skb2->dev = rt->rt6i_dev;
620
621 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
622
623 if (rt)
624 dst_release(&rt->u.dst);
625
626 kfree_skb(skb2);
627 }
628
629 return 0;
630 }
631
632 static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
633 struct ipv6hdr *ipv6h,
634 struct sk_buff *skb)
635 {
636 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
637
638 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
639 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
640
641 if (INET_ECN_is_ce(dsfield))
642 IP_ECN_set_ce(ip_hdr(skb));
643 }
644
645 static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
646 struct ipv6hdr *ipv6h,
647 struct sk_buff *skb)
648 {
649 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
650 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
651
652 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
653 IP6_ECN_set_ce(ipv6_hdr(skb));
654 }
655
656 static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
657 {
658 struct ip6_tnl_parm *p = &t->parms;
659 int ret = 0;
660 struct net *net = dev_net(t->dev);
661
662 if (p->flags & IP6_TNL_F_CAP_RCV) {
663 struct net_device *ldev = NULL;
664
665 if (p->link)
666 ldev = dev_get_by_index(net, p->link);
667
668 if ((ipv6_addr_is_multicast(&p->laddr) ||
669 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
670 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
671 ret = 1;
672
673 if (ldev)
674 dev_put(ldev);
675 }
676 return ret;
677 }
678
679 /**
680 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
681 * @skb: received socket buffer
682 * @protocol: ethernet protocol ID
683 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
684 *
685 * Return: 0
686 **/
687
688 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
689 __u8 ipproto,
690 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t,
691 struct ipv6hdr *ipv6h,
692 struct sk_buff *skb))
693 {
694 struct ip6_tnl *t;
695 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
696
697 read_lock(&ip6_tnl_lock);
698
699 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
700 &ipv6h->daddr)) != NULL) {
701 if (t->parms.proto != ipproto && t->parms.proto != 0) {
702 read_unlock(&ip6_tnl_lock);
703 goto discard;
704 }
705
706 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
707 read_unlock(&ip6_tnl_lock);
708 goto discard;
709 }
710
711 if (!ip6_tnl_rcv_ctl(t)) {
712 t->dev->stats.rx_dropped++;
713 read_unlock(&ip6_tnl_lock);
714 goto discard;
715 }
716 secpath_reset(skb);
717 skb->mac_header = skb->network_header;
718 skb_reset_network_header(skb);
719 skb->protocol = htons(protocol);
720 skb->pkt_type = PACKET_HOST;
721 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
722 skb->dev = t->dev;
723 skb_dst_drop(skb);
724 nf_reset(skb);
725
726 dscp_ecn_decapsulate(t, ipv6h, skb);
727
728 t->dev->stats.rx_packets++;
729 t->dev->stats.rx_bytes += skb->len;
730 netif_rx(skb);
731 read_unlock(&ip6_tnl_lock);
732 return 0;
733 }
734 read_unlock(&ip6_tnl_lock);
735 return 1;
736
737 discard:
738 kfree_skb(skb);
739 return 0;
740 }
741
742 static int ip4ip6_rcv(struct sk_buff *skb)
743 {
744 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
745 ip4ip6_dscp_ecn_decapsulate);
746 }
747
748 static int ip6ip6_rcv(struct sk_buff *skb)
749 {
750 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
751 ip6ip6_dscp_ecn_decapsulate);
752 }
753
754 struct ipv6_tel_txoption {
755 struct ipv6_txoptions ops;
756 __u8 dst_opt[8];
757 };
758
759 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
760 {
761 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
762
763 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
764 opt->dst_opt[3] = 1;
765 opt->dst_opt[4] = encap_limit;
766 opt->dst_opt[5] = IPV6_TLV_PADN;
767 opt->dst_opt[6] = 1;
768
769 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
770 opt->ops.opt_nflen = 8;
771 }
772
773 /**
774 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
775 * @t: the outgoing tunnel device
776 * @hdr: IPv6 header from the incoming packet
777 *
778 * Description:
779 * Avoid trivial tunneling loop by checking that tunnel exit-point
780 * doesn't match source of incoming packet.
781 *
782 * Return:
783 * 1 if conflict,
784 * 0 else
785 **/
786
787 static inline int
788 ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr)
789 {
790 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
791 }
792
793 static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
794 {
795 struct ip6_tnl_parm *p = &t->parms;
796 int ret = 0;
797 struct net *net = dev_net(t->dev);
798
799 if (p->flags & IP6_TNL_F_CAP_XMIT) {
800 struct net_device *ldev = NULL;
801
802 if (p->link)
803 ldev = dev_get_by_index(net, p->link);
804
805 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
806 printk(KERN_WARNING
807 "%s xmit: Local address not yet configured!\n",
808 p->name);
809 else if (!ipv6_addr_is_multicast(&p->raddr) &&
810 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
811 printk(KERN_WARNING
812 "%s xmit: Routing loop! "
813 "Remote address found on this node!\n",
814 p->name);
815 else
816 ret = 1;
817 if (ldev)
818 dev_put(ldev);
819 }
820 return ret;
821 }
822 /**
823 * ip6_tnl_xmit2 - encapsulate packet and send
824 * @skb: the outgoing socket buffer
825 * @dev: the outgoing tunnel device
826 * @dsfield: dscp code for outer header
827 * @fl: flow of tunneled packet
828 * @encap_limit: encapsulation limit
829 * @pmtu: Path MTU is stored if packet is too big
830 *
831 * Description:
832 * Build new header and do some sanity checks on the packet before sending
833 * it.
834 *
835 * Return:
836 * 0 on success
837 * -1 fail
838 * %-EMSGSIZE message too big. return mtu in this case.
839 **/
840
841 static int ip6_tnl_xmit2(struct sk_buff *skb,
842 struct net_device *dev,
843 __u8 dsfield,
844 struct flowi *fl,
845 int encap_limit,
846 __u32 *pmtu)
847 {
848 struct net *net = dev_net(dev);
849 struct ip6_tnl *t = netdev_priv(dev);
850 struct net_device_stats *stats = &t->dev->stats;
851 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
852 struct ipv6_tel_txoption opt;
853 struct dst_entry *dst;
854 struct net_device *tdev;
855 int mtu;
856 unsigned int max_headroom = sizeof(struct ipv6hdr);
857 u8 proto;
858 int err = -1;
859 int pkt_len;
860
861 if ((dst = ip6_tnl_dst_check(t)) != NULL)
862 dst_hold(dst);
863 else {
864 dst = ip6_route_output(net, NULL, fl);
865
866 if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0)
867 goto tx_err_link_failure;
868 }
869
870 tdev = dst->dev;
871
872 if (tdev == dev) {
873 stats->collisions++;
874 if (net_ratelimit())
875 printk(KERN_WARNING
876 "%s: Local routing loop detected!\n",
877 t->parms.name);
878 goto tx_err_dst_release;
879 }
880 mtu = dst_mtu(dst) - sizeof (*ipv6h);
881 if (encap_limit >= 0) {
882 max_headroom += 8;
883 mtu -= 8;
884 }
885 if (mtu < IPV6_MIN_MTU)
886 mtu = IPV6_MIN_MTU;
887 if (skb_dst(skb))
888 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
889 if (skb->len > mtu) {
890 *pmtu = mtu;
891 err = -EMSGSIZE;
892 goto tx_err_dst_release;
893 }
894
895 /*
896 * Okay, now see if we can stuff it in the buffer as-is.
897 */
898 max_headroom += LL_RESERVED_SPACE(tdev);
899
900 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
901 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
902 struct sk_buff *new_skb;
903
904 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
905 goto tx_err_dst_release;
906
907 if (skb->sk)
908 skb_set_owner_w(new_skb, skb->sk);
909 kfree_skb(skb);
910 skb = new_skb;
911 }
912 skb_dst_drop(skb);
913 skb_dst_set(skb, dst_clone(dst));
914
915 skb->transport_header = skb->network_header;
916
917 proto = fl->proto;
918 if (encap_limit >= 0) {
919 init_tel_txopt(&opt, encap_limit);
920 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
921 }
922 skb_push(skb, sizeof(struct ipv6hdr));
923 skb_reset_network_header(skb);
924 ipv6h = ipv6_hdr(skb);
925 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000);
926 dsfield = INET_ECN_encapsulate(0, dsfield);
927 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
928 ipv6h->hop_limit = t->parms.hop_limit;
929 ipv6h->nexthdr = proto;
930 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src);
931 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst);
932 nf_reset(skb);
933 pkt_len = skb->len;
934 err = ip6_local_out(skb);
935
936 if (net_xmit_eval(err) == 0) {
937 stats->tx_bytes += pkt_len;
938 stats->tx_packets++;
939 } else {
940 stats->tx_errors++;
941 stats->tx_aborted_errors++;
942 }
943 ip6_tnl_dst_store(t, dst);
944 return 0;
945 tx_err_link_failure:
946 stats->tx_carrier_errors++;
947 dst_link_failure(skb);
948 tx_err_dst_release:
949 dst_release(dst);
950 return err;
951 }
952
953 static inline int
954 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
955 {
956 struct ip6_tnl *t = netdev_priv(dev);
957 struct iphdr *iph = ip_hdr(skb);
958 int encap_limit = -1;
959 struct flowi fl;
960 __u8 dsfield;
961 __u32 mtu;
962 int err;
963
964 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
965 !ip6_tnl_xmit_ctl(t))
966 return -1;
967
968 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
969 encap_limit = t->parms.encap_limit;
970
971 memcpy(&fl, &t->fl, sizeof (fl));
972 fl.proto = IPPROTO_IPIP;
973
974 dsfield = ipv4_get_dsfield(iph);
975
976 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
977 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
978 & IPV6_TCLASS_MASK;
979
980 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
981 if (err != 0) {
982 /* XXX: send ICMP error even if DF is not set. */
983 if (err == -EMSGSIZE)
984 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
985 htonl(mtu));
986 return -1;
987 }
988
989 return 0;
990 }
991
992 static inline int
993 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
994 {
995 struct ip6_tnl *t = netdev_priv(dev);
996 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
997 int encap_limit = -1;
998 __u16 offset;
999 struct flowi fl;
1000 __u8 dsfield;
1001 __u32 mtu;
1002 int err;
1003
1004 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1005 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1006 return -1;
1007
1008 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1009 if (offset > 0) {
1010 struct ipv6_tlv_tnl_enc_lim *tel;
1011 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1012 if (tel->encap_limit == 0) {
1013 icmpv6_send(skb, ICMPV6_PARAMPROB,
1014 ICMPV6_HDR_FIELD, offset + 2, skb->dev);
1015 return -1;
1016 }
1017 encap_limit = tel->encap_limit - 1;
1018 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1019 encap_limit = t->parms.encap_limit;
1020
1021 memcpy(&fl, &t->fl, sizeof (fl));
1022 fl.proto = IPPROTO_IPV6;
1023
1024 dsfield = ipv6_get_dsfield(ipv6h);
1025 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1026 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1027 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1028 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1029
1030 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu);
1031 if (err != 0) {
1032 if (err == -EMSGSIZE)
1033 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1034 return -1;
1035 }
1036
1037 return 0;
1038 }
1039
1040 static netdev_tx_t
1041 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1042 {
1043 struct ip6_tnl *t = netdev_priv(dev);
1044 struct net_device_stats *stats = &t->dev->stats;
1045 int ret;
1046
1047 switch (skb->protocol) {
1048 case htons(ETH_P_IP):
1049 ret = ip4ip6_tnl_xmit(skb, dev);
1050 break;
1051 case htons(ETH_P_IPV6):
1052 ret = ip6ip6_tnl_xmit(skb, dev);
1053 break;
1054 default:
1055 goto tx_err;
1056 }
1057
1058 if (ret < 0)
1059 goto tx_err;
1060
1061 return NETDEV_TX_OK;
1062
1063 tx_err:
1064 stats->tx_errors++;
1065 stats->tx_dropped++;
1066 kfree_skb(skb);
1067 return NETDEV_TX_OK;
1068 }
1069
1070 static void ip6_tnl_set_cap(struct ip6_tnl *t)
1071 {
1072 struct ip6_tnl_parm *p = &t->parms;
1073 int ltype = ipv6_addr_type(&p->laddr);
1074 int rtype = ipv6_addr_type(&p->raddr);
1075
1076 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1077
1078 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1079 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1080 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
1081 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
1082 if (ltype&IPV6_ADDR_UNICAST)
1083 p->flags |= IP6_TNL_F_CAP_XMIT;
1084 if (rtype&IPV6_ADDR_UNICAST)
1085 p->flags |= IP6_TNL_F_CAP_RCV;
1086 }
1087 }
1088
1089 static void ip6_tnl_link_config(struct ip6_tnl *t)
1090 {
1091 struct net_device *dev = t->dev;
1092 struct ip6_tnl_parm *p = &t->parms;
1093 struct flowi *fl = &t->fl;
1094
1095 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1096 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1097
1098 /* Set up flowi template */
1099 ipv6_addr_copy(&fl->fl6_src, &p->laddr);
1100 ipv6_addr_copy(&fl->fl6_dst, &p->raddr);
1101 fl->oif = p->link;
1102 fl->fl6_flowlabel = 0;
1103
1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1105 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1107 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1108
1109 ip6_tnl_set_cap(t);
1110
1111 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1112 dev->flags |= IFF_POINTOPOINT;
1113 else
1114 dev->flags &= ~IFF_POINTOPOINT;
1115
1116 dev->iflink = p->link;
1117
1118 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1119 int strict = (ipv6_addr_type(&p->raddr) &
1120 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1121
1122 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1123 &p->raddr, &p->laddr,
1124 p->link, strict);
1125
1126 if (rt == NULL)
1127 return;
1128
1129 if (rt->rt6i_dev) {
1130 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1131 sizeof (struct ipv6hdr);
1132
1133 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1134
1135 if (dev->mtu < IPV6_MIN_MTU)
1136 dev->mtu = IPV6_MIN_MTU;
1137 }
1138 dst_release(&rt->u.dst);
1139 }
1140 }
1141
1142 /**
1143 * ip6_tnl_change - update the tunnel parameters
1144 * @t: tunnel to be changed
1145 * @p: tunnel configuration parameters
1146 *
1147 * Description:
1148 * ip6_tnl_change() updates the tunnel parameters
1149 **/
1150
1151 static int
1152 ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
1153 {
1154 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1155 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1156 t->parms.flags = p->flags;
1157 t->parms.hop_limit = p->hop_limit;
1158 t->parms.encap_limit = p->encap_limit;
1159 t->parms.flowinfo = p->flowinfo;
1160 t->parms.link = p->link;
1161 t->parms.proto = p->proto;
1162 ip6_tnl_dst_reset(t);
1163 ip6_tnl_link_config(t);
1164 return 0;
1165 }
1166
1167 /**
1168 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1169 * @dev: virtual device associated with tunnel
1170 * @ifr: parameters passed from userspace
1171 * @cmd: command to be performed
1172 *
1173 * Description:
1174 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1175 * from userspace.
1176 *
1177 * The possible commands are the following:
1178 * %SIOCGETTUNNEL: get tunnel parameters for device
1179 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1180 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1181 * %SIOCDELTUNNEL: delete tunnel
1182 *
1183 * The fallback device "ip6tnl0", created during module
1184 * initialization, can be used for creating other tunnel devices.
1185 *
1186 * Return:
1187 * 0 on success,
1188 * %-EFAULT if unable to copy data to or from userspace,
1189 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1190 * %-EINVAL if passed tunnel parameters are invalid,
1191 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1192 * %-ENODEV if attempting to change or delete a nonexisting device
1193 **/
1194
1195 static int
1196 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1197 {
1198 int err = 0;
1199 struct ip6_tnl_parm p;
1200 struct ip6_tnl *t = NULL;
1201 struct net *net = dev_net(dev);
1202 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1203
1204 switch (cmd) {
1205 case SIOCGETTUNNEL:
1206 if (dev == ip6n->fb_tnl_dev) {
1207 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1208 err = -EFAULT;
1209 break;
1210 }
1211 t = ip6_tnl_locate(net, &p, 0);
1212 }
1213 if (t == NULL)
1214 t = netdev_priv(dev);
1215 memcpy(&p, &t->parms, sizeof (p));
1216 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1217 err = -EFAULT;
1218 }
1219 break;
1220 case SIOCADDTUNNEL:
1221 case SIOCCHGTUNNEL:
1222 err = -EPERM;
1223 if (!capable(CAP_NET_ADMIN))
1224 break;
1225 err = -EFAULT;
1226 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1227 break;
1228 err = -EINVAL;
1229 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1230 p.proto != 0)
1231 break;
1232 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
1233 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1234 if (t != NULL) {
1235 if (t->dev != dev) {
1236 err = -EEXIST;
1237 break;
1238 }
1239 } else
1240 t = netdev_priv(dev);
1241
1242 ip6_tnl_unlink(ip6n, t);
1243 err = ip6_tnl_change(t, &p);
1244 ip6_tnl_link(ip6n, t);
1245 netdev_state_change(dev);
1246 }
1247 if (t) {
1248 err = 0;
1249 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1250 err = -EFAULT;
1251
1252 } else
1253 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1254 break;
1255 case SIOCDELTUNNEL:
1256 err = -EPERM;
1257 if (!capable(CAP_NET_ADMIN))
1258 break;
1259
1260 if (dev == ip6n->fb_tnl_dev) {
1261 err = -EFAULT;
1262 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1263 break;
1264 err = -ENOENT;
1265 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
1266 break;
1267 err = -EPERM;
1268 if (t->dev == ip6n->fb_tnl_dev)
1269 break;
1270 dev = t->dev;
1271 }
1272 err = 0;
1273 unregister_netdevice(dev);
1274 break;
1275 default:
1276 err = -EINVAL;
1277 }
1278 return err;
1279 }
1280
1281 /**
1282 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1283 * @dev: virtual device associated with tunnel
1284 * @new_mtu: the new mtu
1285 *
1286 * Return:
1287 * 0 on success,
1288 * %-EINVAL if mtu too small
1289 **/
1290
1291 static int
1292 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1293 {
1294 if (new_mtu < IPV6_MIN_MTU) {
1295 return -EINVAL;
1296 }
1297 dev->mtu = new_mtu;
1298 return 0;
1299 }
1300
1301
1302 static const struct net_device_ops ip6_tnl_netdev_ops = {
1303 .ndo_uninit = ip6_tnl_dev_uninit,
1304 .ndo_start_xmit = ip6_tnl_xmit,
1305 .ndo_do_ioctl = ip6_tnl_ioctl,
1306 .ndo_change_mtu = ip6_tnl_change_mtu,
1307 };
1308
1309 /**
1310 * ip6_tnl_dev_setup - setup virtual tunnel device
1311 * @dev: virtual device associated with tunnel
1312 *
1313 * Description:
1314 * Initialize function pointers and device parameters
1315 **/
1316
1317 static void ip6_tnl_dev_setup(struct net_device *dev)
1318 {
1319 dev->netdev_ops = &ip6_tnl_netdev_ops;
1320 dev->destructor = free_netdev;
1321
1322 dev->type = ARPHRD_TUNNEL6;
1323 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1324 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1325 dev->flags |= IFF_NOARP;
1326 dev->addr_len = sizeof(struct in6_addr);
1327 dev->features |= NETIF_F_NETNS_LOCAL;
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 void ip6_tnl_dev_init(struct net_device *dev)
1350 {
1351 struct ip6_tnl *t = netdev_priv(dev);
1352 ip6_tnl_dev_init_gen(dev);
1353 ip6_tnl_link_config(t);
1354 }
1355
1356 /**
1357 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1358 * @dev: fallback device
1359 *
1360 * Return: 0
1361 **/
1362
1363 static void ip6_fb_tnl_dev_init(struct net_device *dev)
1364 {
1365 struct ip6_tnl *t = netdev_priv(dev);
1366 struct net *net = dev_net(dev);
1367 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1368
1369 ip6_tnl_dev_init_gen(dev);
1370 t->parms.proto = IPPROTO_IPV6;
1371 dev_hold(dev);
1372 ip6n->tnls_wc[0] = t;
1373 }
1374
1375 static struct xfrm6_tunnel ip4ip6_handler = {
1376 .handler = ip4ip6_rcv,
1377 .err_handler = ip4ip6_err,
1378 .priority = 1,
1379 };
1380
1381 static struct xfrm6_tunnel ip6ip6_handler = {
1382 .handler = ip6ip6_rcv,
1383 .err_handler = ip6ip6_err,
1384 .priority = 1,
1385 };
1386
1387 static void ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
1388 {
1389 int h;
1390 struct ip6_tnl *t;
1391
1392 for (h = 0; h < HASH_SIZE; h++) {
1393 while ((t = ip6n->tnls_r_l[h]) != NULL)
1394 unregister_netdevice(t->dev);
1395 }
1396
1397 t = ip6n->tnls_wc[0];
1398 unregister_netdevice(t->dev);
1399 }
1400
1401 static int ip6_tnl_init_net(struct net *net)
1402 {
1403 int err;
1404 struct ip6_tnl_net *ip6n;
1405
1406 err = -ENOMEM;
1407 ip6n = kzalloc(sizeof(struct ip6_tnl_net), GFP_KERNEL);
1408 if (ip6n == NULL)
1409 goto err_alloc;
1410
1411 err = net_assign_generic(net, ip6_tnl_net_id, ip6n);
1412 if (err < 0)
1413 goto err_assign;
1414
1415 ip6n->tnls[0] = ip6n->tnls_wc;
1416 ip6n->tnls[1] = ip6n->tnls_r_l;
1417
1418 err = -ENOMEM;
1419 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1420 ip6_tnl_dev_setup);
1421
1422 if (!ip6n->fb_tnl_dev)
1423 goto err_alloc_dev;
1424 dev_net_set(ip6n->fb_tnl_dev, net);
1425
1426 ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1427
1428 err = register_netdev(ip6n->fb_tnl_dev);
1429 if (err < 0)
1430 goto err_register;
1431 return 0;
1432
1433 err_register:
1434 free_netdev(ip6n->fb_tnl_dev);
1435 err_alloc_dev:
1436 /* nothing */
1437 err_assign:
1438 kfree(ip6n);
1439 err_alloc:
1440 return err;
1441 }
1442
1443 static void ip6_tnl_exit_net(struct net *net)
1444 {
1445 struct ip6_tnl_net *ip6n;
1446
1447 ip6n = net_generic(net, ip6_tnl_net_id);
1448 rtnl_lock();
1449 ip6_tnl_destroy_tunnels(ip6n);
1450 rtnl_unlock();
1451 kfree(ip6n);
1452 }
1453
1454 static struct pernet_operations ip6_tnl_net_ops = {
1455 .init = ip6_tnl_init_net,
1456 .exit = ip6_tnl_exit_net,
1457 };
1458
1459 /**
1460 * ip6_tunnel_init - register protocol and reserve needed resources
1461 *
1462 * Return: 0 on success
1463 **/
1464
1465 static int __init ip6_tunnel_init(void)
1466 {
1467 int err;
1468
1469 err = register_pernet_gen_device(&ip6_tnl_net_id, &ip6_tnl_net_ops);
1470 if (err < 0)
1471 goto out_pernet;
1472
1473 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1474 if (err < 0) {
1475 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1476 goto out_ip4ip6;
1477 }
1478
1479 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1480 if (err < 0) {
1481 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1482 goto out_ip6ip6;
1483 }
1484
1485 return 0;
1486
1487 out_ip6ip6:
1488 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1489 out_ip4ip6:
1490 unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops);
1491 out_pernet:
1492 return err;
1493 }
1494
1495 /**
1496 * ip6_tunnel_cleanup - free resources and unregister protocol
1497 **/
1498
1499 static void __exit ip6_tunnel_cleanup(void)
1500 {
1501 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1502 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
1503
1504 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1505 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
1506
1507 unregister_pernet_gen_device(ip6_tnl_net_id, &ip6_tnl_net_ops);
1508 }
1509
1510 module_init(ip6_tunnel_init);
1511 module_exit(ip6_tunnel_cleanup);
1512
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