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Linux 4.1.16
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blob5cafd92c231270703af5bf948d131d99c5e9c193
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/route.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/netfilter_ipv6.h>
41 #include <linux/slab.h>
42 #include <linux/hash.h>
43 #include <linux/etherdevice.h>
44
45 #include <asm/uaccess.h>
46 #include <linux/atomic.h>
47
48 #include <net/icmp.h>
49 #include <net/ip.h>
50 #include <net/ip_tunnels.h>
51 #include <net/ipv6.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_tunnel.h>
55 #include <net/xfrm.h>
56 #include <net/dsfield.h>
57 #include <net/inet_ecn.h>
58 #include <net/net_namespace.h>
59 #include <net/netns/generic.h>
60
61 MODULE_AUTHOR("Ville Nuorvala");
62 MODULE_DESCRIPTION("IPv6 tunneling device");
63 MODULE_LICENSE("GPL");
64 MODULE_ALIAS_RTNL_LINK("ip6tnl");
65 MODULE_ALIAS_NETDEV("ip6tnl0");
66
67 #define HASH_SIZE_SHIFT 5
68 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69
70 static bool log_ecn_error = true;
71 module_param(log_ecn_error, bool, 0644);
72 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73
74 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
75 {
76 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
77
78 return hash_32(hash, HASH_SIZE_SHIFT);
79 }
80
81 static int ip6_tnl_dev_init(struct net_device *dev);
82 static void ip6_tnl_dev_setup(struct net_device *dev);
83 static struct rtnl_link_ops ip6_link_ops __read_mostly;
84
85 static int ip6_tnl_net_id __read_mostly;
86 struct ip6_tnl_net {
87 /* the IPv6 tunnel fallback device */
88 struct net_device *fb_tnl_dev;
89 /* lists for storing tunnels in use */
90 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
91 struct ip6_tnl __rcu *tnls_wc[1];
92 struct ip6_tnl __rcu **tnls[2];
93 };
94
95 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
96 {
97 struct pcpu_sw_netstats tmp, sum = { 0 };
98 int i;
99
100 for_each_possible_cpu(i) {
101 unsigned int start;
102 const struct pcpu_sw_netstats *tstats =
103 per_cpu_ptr(dev->tstats, i);
104
105 do {
106 start = u64_stats_fetch_begin_irq(&tstats->syncp);
107 tmp.rx_packets = tstats->rx_packets;
108 tmp.rx_bytes = tstats->rx_bytes;
109 tmp.tx_packets = tstats->tx_packets;
110 tmp.tx_bytes = tstats->tx_bytes;
111 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
112
113 sum.rx_packets += tmp.rx_packets;
114 sum.rx_bytes += tmp.rx_bytes;
115 sum.tx_packets += tmp.tx_packets;
116 sum.tx_bytes += tmp.tx_bytes;
117 }
118 dev->stats.rx_packets = sum.rx_packets;
119 dev->stats.rx_bytes = sum.rx_bytes;
120 dev->stats.tx_packets = sum.tx_packets;
121 dev->stats.tx_bytes = sum.tx_bytes;
122 return &dev->stats;
123 }
124
125 /*
126 * Locking : hash tables are protected by RCU and RTNL
127 */
128
129 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
130 {
131 struct dst_entry *dst = t->dst_cache;
132
133 if (dst && dst->obsolete &&
134 !dst->ops->check(dst, t->dst_cookie)) {
135 t->dst_cache = NULL;
136 dst_release(dst);
137 return NULL;
138 }
139
140 return dst;
141 }
142 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
143
144 void ip6_tnl_dst_reset(struct ip6_tnl *t)
145 {
146 dst_release(t->dst_cache);
147 t->dst_cache = NULL;
148 }
149 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
150
151 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
152 {
153 struct rt6_info *rt = (struct rt6_info *) dst;
154 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
155 dst_release(t->dst_cache);
156 t->dst_cache = dst;
157 }
158 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
159
160 /**
161 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
162 * @remote: the address of the tunnel exit-point
163 * @local: the address of the tunnel entry-point
164 *
165 * Return:
166 * tunnel matching given end-points if found,
167 * else fallback tunnel if its device is up,
168 * else %NULL
169 **/
170
171 #define for_each_ip6_tunnel_rcu(start) \
172 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
173
174 static struct ip6_tnl *
175 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
176 {
177 unsigned int hash = HASH(remote, local);
178 struct ip6_tnl *t;
179 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
180 struct in6_addr any;
181
182 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
183 if (ipv6_addr_equal(local, &t->parms.laddr) &&
184 ipv6_addr_equal(remote, &t->parms.raddr) &&
185 (t->dev->flags & IFF_UP))
186 return t;
187 }
188
189 memset(&any, 0, sizeof(any));
190 hash = HASH(&any, local);
191 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
192 if (ipv6_addr_equal(local, &t->parms.laddr) &&
193 (t->dev->flags & IFF_UP))
194 return t;
195 }
196
197 hash = HASH(remote, &any);
198 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
199 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
200 (t->dev->flags & IFF_UP))
201 return t;
202 }
203
204 t = rcu_dereference(ip6n->tnls_wc[0]);
205 if (t && (t->dev->flags & IFF_UP))
206 return t;
207
208 return NULL;
209 }
210
211 /**
212 * ip6_tnl_bucket - get head of list matching given tunnel parameters
213 * @p: parameters containing tunnel end-points
214 *
215 * Description:
216 * ip6_tnl_bucket() returns the head of the list matching the
217 * &struct in6_addr entries laddr and raddr in @p.
218 *
219 * Return: head of IPv6 tunnel list
220 **/
221
222 static struct ip6_tnl __rcu **
223 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
224 {
225 const struct in6_addr *remote = &p->raddr;
226 const struct in6_addr *local = &p->laddr;
227 unsigned int h = 0;
228 int prio = 0;
229
230 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
231 prio = 1;
232 h = HASH(remote, local);
233 }
234 return &ip6n->tnls[prio][h];
235 }
236
237 /**
238 * ip6_tnl_link - add tunnel to hash table
239 * @t: tunnel to be added
240 **/
241
242 static void
243 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
244 {
245 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
246
247 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
248 rcu_assign_pointer(*tp, t);
249 }
250
251 /**
252 * ip6_tnl_unlink - remove tunnel from hash table
253 * @t: tunnel to be removed
254 **/
255
256 static void
257 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
258 {
259 struct ip6_tnl __rcu **tp;
260 struct ip6_tnl *iter;
261
262 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
263 (iter = rtnl_dereference(*tp)) != NULL;
264 tp = &iter->next) {
265 if (t == iter) {
266 rcu_assign_pointer(*tp, t->next);
267 break;
268 }
269 }
270 }
271
272 static void ip6_dev_free(struct net_device *dev)
273 {
274 free_percpu(dev->tstats);
275 free_netdev(dev);
276 }
277
278 static int ip6_tnl_create2(struct net_device *dev)
279 {
280 struct ip6_tnl *t = netdev_priv(dev);
281 struct net *net = dev_net(dev);
282 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
283 int err;
284
285 t = netdev_priv(dev);
286
287 err = register_netdevice(dev);
288 if (err < 0)
289 goto out;
290
291 strcpy(t->parms.name, dev->name);
292 dev->rtnl_link_ops = &ip6_link_ops;
293
294 dev_hold(dev);
295 ip6_tnl_link(ip6n, t);
296 return 0;
297
298 out:
299 return err;
300 }
301
302 /**
303 * ip6_tnl_create - create a new tunnel
304 * @p: tunnel parameters
305 * @pt: pointer to new tunnel
306 *
307 * Description:
308 * Create tunnel matching given parameters.
309 *
310 * Return:
311 * created tunnel or error pointer
312 **/
313
314 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
315 {
316 struct net_device *dev;
317 struct ip6_tnl *t;
318 char name[IFNAMSIZ];
319 int err = -ENOMEM;
320
321 if (p->name[0])
322 strlcpy(name, p->name, IFNAMSIZ);
323 else
324 sprintf(name, "ip6tnl%%d");
325
326 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
327 ip6_tnl_dev_setup);
328 if (!dev)
329 goto failed;
330
331 dev_net_set(dev, net);
332
333 t = netdev_priv(dev);
334 t->parms = *p;
335 t->net = dev_net(dev);
336 err = ip6_tnl_create2(dev);
337 if (err < 0)
338 goto failed_free;
339
340 return t;
341
342 failed_free:
343 ip6_dev_free(dev);
344 failed:
345 return ERR_PTR(err);
346 }
347
348 /**
349 * ip6_tnl_locate - find or create tunnel matching given parameters
350 * @p: tunnel parameters
351 * @create: != 0 if allowed to create new tunnel if no match found
352 *
353 * Description:
354 * ip6_tnl_locate() first tries to locate an existing tunnel
355 * based on @parms. If this is unsuccessful, but @create is set a new
356 * tunnel device is created and registered for use.
357 *
358 * Return:
359 * matching tunnel or error pointer
360 **/
361
362 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
363 struct __ip6_tnl_parm *p, int create)
364 {
365 const struct in6_addr *remote = &p->raddr;
366 const struct in6_addr *local = &p->laddr;
367 struct ip6_tnl __rcu **tp;
368 struct ip6_tnl *t;
369 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
370
371 for (tp = ip6_tnl_bucket(ip6n, p);
372 (t = rtnl_dereference(*tp)) != NULL;
373 tp = &t->next) {
374 if (ipv6_addr_equal(local, &t->parms.laddr) &&
375 ipv6_addr_equal(remote, &t->parms.raddr)) {
376 if (create)
377 return ERR_PTR(-EEXIST);
378
379 return t;
380 }
381 }
382 if (!create)
383 return ERR_PTR(-ENODEV);
384 return ip6_tnl_create(net, p);
385 }
386
387 /**
388 * ip6_tnl_dev_uninit - tunnel device uninitializer
389 * @dev: the device to be destroyed
390 *
391 * Description:
392 * ip6_tnl_dev_uninit() removes tunnel from its list
393 **/
394
395 static void
396 ip6_tnl_dev_uninit(struct net_device *dev)
397 {
398 struct ip6_tnl *t = netdev_priv(dev);
399 struct net *net = t->net;
400 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
401
402 if (dev == ip6n->fb_tnl_dev)
403 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
404 else
405 ip6_tnl_unlink(ip6n, t);
406 ip6_tnl_dst_reset(t);
407 dev_put(dev);
408 }
409
410 /**
411 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
412 * @skb: received socket buffer
413 *
414 * Return:
415 * 0 if none was found,
416 * else index to encapsulation limit
417 **/
418
419 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
420 {
421 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
422 __u8 nexthdr = ipv6h->nexthdr;
423 __u16 off = sizeof(*ipv6h);
424
425 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
426 __u16 optlen = 0;
427 struct ipv6_opt_hdr *hdr;
428 if (raw + off + sizeof(*hdr) > skb->data &&
429 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
430 break;
431
432 hdr = (struct ipv6_opt_hdr *) (raw + off);
433 if (nexthdr == NEXTHDR_FRAGMENT) {
434 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
435 if (frag_hdr->frag_off)
436 break;
437 optlen = 8;
438 } else if (nexthdr == NEXTHDR_AUTH) {
439 optlen = (hdr->hdrlen + 2) << 2;
440 } else {
441 optlen = ipv6_optlen(hdr);
442 }
443 if (nexthdr == NEXTHDR_DEST) {
444 __u16 i = off + 2;
445 while (1) {
446 struct ipv6_tlv_tnl_enc_lim *tel;
447
448 /* No more room for encapsulation limit */
449 if (i + sizeof (*tel) > off + optlen)
450 break;
451
452 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
453 /* return index of option if found and valid */
454 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
455 tel->length == 1)
456 return i;
457 /* else jump to next option */
458 if (tel->type)
459 i += tel->length + 2;
460 else
461 i++;
462 }
463 }
464 nexthdr = hdr->nexthdr;
465 off += optlen;
466 }
467 return 0;
468 }
469 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
470
471 /**
472 * ip6_tnl_err - tunnel error handler
473 *
474 * Description:
475 * ip6_tnl_err() should handle errors in the tunnel according
476 * to the specifications in RFC 2473.
477 **/
478
479 static int
480 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
481 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
482 {
483 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
484 struct ip6_tnl *t;
485 int rel_msg = 0;
486 u8 rel_type = ICMPV6_DEST_UNREACH;
487 u8 rel_code = ICMPV6_ADDR_UNREACH;
488 u8 tproto;
489 __u32 rel_info = 0;
490 __u16 len;
491 int err = -ENOENT;
492
493 /* If the packet doesn't contain the original IPv6 header we are
494 in trouble since we might need the source address for further
495 processing of the error. */
496
497 rcu_read_lock();
498 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
499 if (!t)
500 goto out;
501
502 tproto = ACCESS_ONCE(t->parms.proto);
503 if (tproto != ipproto && tproto != 0)
504 goto out;
505
506 err = 0;
507
508 switch (*type) {
509 __u32 teli;
510 struct ipv6_tlv_tnl_enc_lim *tel;
511 __u32 mtu;
512 case ICMPV6_DEST_UNREACH:
513 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
514 t->parms.name);
515 rel_msg = 1;
516 break;
517 case ICMPV6_TIME_EXCEED:
518 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
519 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
520 t->parms.name);
521 rel_msg = 1;
522 }
523 break;
524 case ICMPV6_PARAMPROB:
525 teli = 0;
526 if ((*code) == ICMPV6_HDR_FIELD)
527 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
528
529 if (teli && teli == *info - 2) {
530 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
531 if (tel->encap_limit == 0) {
532 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
533 t->parms.name);
534 rel_msg = 1;
535 }
536 } else {
537 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
538 t->parms.name);
539 }
540 break;
541 case ICMPV6_PKT_TOOBIG:
542 mtu = *info - offset;
543 if (mtu < IPV6_MIN_MTU)
544 mtu = IPV6_MIN_MTU;
545 t->dev->mtu = mtu;
546
547 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
548 if (len > mtu) {
549 rel_type = ICMPV6_PKT_TOOBIG;
550 rel_code = 0;
551 rel_info = mtu;
552 rel_msg = 1;
553 }
554 break;
555 }
556
557 *type = rel_type;
558 *code = rel_code;
559 *info = rel_info;
560 *msg = rel_msg;
561
562 out:
563 rcu_read_unlock();
564 return err;
565 }
566
567 static int
568 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
569 u8 type, u8 code, int offset, __be32 info)
570 {
571 int rel_msg = 0;
572 u8 rel_type = type;
573 u8 rel_code = code;
574 __u32 rel_info = ntohl(info);
575 int err;
576 struct sk_buff *skb2;
577 const struct iphdr *eiph;
578 struct rtable *rt;
579 struct flowi4 fl4;
580
581 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
582 &rel_msg, &rel_info, offset);
583 if (err < 0)
584 return err;
585
586 if (rel_msg == 0)
587 return 0;
588
589 switch (rel_type) {
590 case ICMPV6_DEST_UNREACH:
591 if (rel_code != ICMPV6_ADDR_UNREACH)
592 return 0;
593 rel_type = ICMP_DEST_UNREACH;
594 rel_code = ICMP_HOST_UNREACH;
595 break;
596 case ICMPV6_PKT_TOOBIG:
597 if (rel_code != 0)
598 return 0;
599 rel_type = ICMP_DEST_UNREACH;
600 rel_code = ICMP_FRAG_NEEDED;
601 break;
602 case NDISC_REDIRECT:
603 rel_type = ICMP_REDIRECT;
604 rel_code = ICMP_REDIR_HOST;
605 default:
606 return 0;
607 }
608
609 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
610 return 0;
611
612 skb2 = skb_clone(skb, GFP_ATOMIC);
613 if (!skb2)
614 return 0;
615
616 skb_dst_drop(skb2);
617
618 skb_pull(skb2, offset);
619 skb_reset_network_header(skb2);
620 eiph = ip_hdr(skb2);
621
622 /* Try to guess incoming interface */
623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
624 eiph->saddr, 0,
625 0, 0,
626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
627 if (IS_ERR(rt))
628 goto out;
629
630 skb2->dev = rt->dst.dev;
631
632 /* route "incoming" packet */
633 if (rt->rt_flags & RTCF_LOCAL) {
634 ip_rt_put(rt);
635 rt = NULL;
636 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
637 eiph->daddr, eiph->saddr,
638 0, 0,
639 IPPROTO_IPIP,
640 RT_TOS(eiph->tos), 0);
641 if (IS_ERR(rt) ||
642 rt->dst.dev->type != ARPHRD_TUNNEL) {
643 if (!IS_ERR(rt))
644 ip_rt_put(rt);
645 goto out;
646 }
647 skb_dst_set(skb2, &rt->dst);
648 } else {
649 ip_rt_put(rt);
650 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
651 skb2->dev) ||
652 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
653 goto out;
654 }
655
656 /* change mtu on this route */
657 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
658 if (rel_info > dst_mtu(skb_dst(skb2)))
659 goto out;
660
661 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
662 }
663 if (rel_type == ICMP_REDIRECT)
664 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
665
666 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
667
668 out:
669 kfree_skb(skb2);
670 return 0;
671 }
672
673 static int
674 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
675 u8 type, u8 code, int offset, __be32 info)
676 {
677 int rel_msg = 0;
678 u8 rel_type = type;
679 u8 rel_code = code;
680 __u32 rel_info = ntohl(info);
681 int err;
682
683 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
684 &rel_msg, &rel_info, offset);
685 if (err < 0)
686 return err;
687
688 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
689 struct rt6_info *rt;
690 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
691
692 if (!skb2)
693 return 0;
694
695 skb_dst_drop(skb2);
696 skb_pull(skb2, offset);
697 skb_reset_network_header(skb2);
698
699 /* Try to guess incoming interface */
700 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
701 NULL, 0, 0);
702
703 if (rt && rt->dst.dev)
704 skb2->dev = rt->dst.dev;
705
706 icmpv6_send(skb2, rel_type, rel_code, rel_info);
707
708 ip6_rt_put(rt);
709
710 kfree_skb(skb2);
711 }
712
713 return 0;
714 }
715
716 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
717 const struct ipv6hdr *ipv6h,
718 struct sk_buff *skb)
719 {
720 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
721
722 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
723 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
724
725 return IP6_ECN_decapsulate(ipv6h, skb);
726 }
727
728 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
729 const struct ipv6hdr *ipv6h,
730 struct sk_buff *skb)
731 {
732 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
733 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
734
735 return IP6_ECN_decapsulate(ipv6h, skb);
736 }
737
738 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
739 const struct in6_addr *laddr,
740 const struct in6_addr *raddr)
741 {
742 struct __ip6_tnl_parm *p = &t->parms;
743 int ltype = ipv6_addr_type(laddr);
744 int rtype = ipv6_addr_type(raddr);
745 __u32 flags = 0;
746
747 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
748 flags = IP6_TNL_F_CAP_PER_PACKET;
749 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
750 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
751 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
752 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
753 if (ltype&IPV6_ADDR_UNICAST)
754 flags |= IP6_TNL_F_CAP_XMIT;
755 if (rtype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_RCV;
757 }
758 return flags;
759 }
760 EXPORT_SYMBOL(ip6_tnl_get_cap);
761
762 /* called with rcu_read_lock() */
763 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
764 const struct in6_addr *laddr,
765 const struct in6_addr *raddr)
766 {
767 struct __ip6_tnl_parm *p = &t->parms;
768 int ret = 0;
769 struct net *net = t->net;
770
771 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
772 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
773 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
774 struct net_device *ldev = NULL;
775
776 if (p->link)
777 ldev = dev_get_by_index_rcu(net, p->link);
778
779 if ((ipv6_addr_is_multicast(laddr) ||
780 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
781 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
782 ret = 1;
783 }
784 return ret;
785 }
786 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
787
788 /**
789 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
790 * @skb: received socket buffer
791 * @protocol: ethernet protocol ID
792 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
793 *
794 * Return: 0
795 **/
796
797 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
798 __u8 ipproto,
799 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
800 const struct ipv6hdr *ipv6h,
801 struct sk_buff *skb))
802 {
803 struct ip6_tnl *t;
804 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
805 u8 tproto;
806 int err;
807
808 rcu_read_lock();
809 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
810 if (t) {
811 struct pcpu_sw_netstats *tstats;
812
813 tproto = ACCESS_ONCE(t->parms.proto);
814 if (tproto != ipproto && tproto != 0) {
815 rcu_read_unlock();
816 goto discard;
817 }
818
819 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
820 rcu_read_unlock();
821 goto discard;
822 }
823
824 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
825 t->dev->stats.rx_dropped++;
826 rcu_read_unlock();
827 goto discard;
828 }
829 skb->mac_header = skb->network_header;
830 skb_reset_network_header(skb);
831 skb->protocol = htons(protocol);
832 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
833
834 __skb_tunnel_rx(skb, t->dev, t->net);
835
836 err = dscp_ecn_decapsulate(t, ipv6h, skb);
837 if (unlikely(err)) {
838 if (log_ecn_error)
839 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
840 &ipv6h->saddr,
841 ipv6_get_dsfield(ipv6h));
842 if (err > 1) {
843 ++t->dev->stats.rx_frame_errors;
844 ++t->dev->stats.rx_errors;
845 rcu_read_unlock();
846 goto discard;
847 }
848 }
849
850 tstats = this_cpu_ptr(t->dev->tstats);
851 u64_stats_update_begin(&tstats->syncp);
852 tstats->rx_packets++;
853 tstats->rx_bytes += skb->len;
854 u64_stats_update_end(&tstats->syncp);
855
856 netif_rx(skb);
857
858 rcu_read_unlock();
859 return 0;
860 }
861 rcu_read_unlock();
862 return 1;
863
864 discard:
865 kfree_skb(skb);
866 return 0;
867 }
868
869 static int ip4ip6_rcv(struct sk_buff *skb)
870 {
871 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
872 ip4ip6_dscp_ecn_decapsulate);
873 }
874
875 static int ip6ip6_rcv(struct sk_buff *skb)
876 {
877 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
878 ip6ip6_dscp_ecn_decapsulate);
879 }
880
881 struct ipv6_tel_txoption {
882 struct ipv6_txoptions ops;
883 __u8 dst_opt[8];
884 };
885
886 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
887 {
888 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
889
890 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
891 opt->dst_opt[3] = 1;
892 opt->dst_opt[4] = encap_limit;
893 opt->dst_opt[5] = IPV6_TLV_PADN;
894 opt->dst_opt[6] = 1;
895
896 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
897 opt->ops.opt_nflen = 8;
898 }
899
900 /**
901 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
902 * @t: the outgoing tunnel device
903 * @hdr: IPv6 header from the incoming packet
904 *
905 * Description:
906 * Avoid trivial tunneling loop by checking that tunnel exit-point
907 * doesn't match source of incoming packet.
908 *
909 * Return:
910 * 1 if conflict,
911 * 0 else
912 **/
913
914 static inline bool
915 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
916 {
917 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
918 }
919
920 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
921 const struct in6_addr *laddr,
922 const struct in6_addr *raddr)
923 {
924 struct __ip6_tnl_parm *p = &t->parms;
925 int ret = 0;
926 struct net *net = t->net;
927
928 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
929 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
930 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
931 struct net_device *ldev = NULL;
932
933 rcu_read_lock();
934 if (p->link)
935 ldev = dev_get_by_index_rcu(net, p->link);
936
937 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
938 pr_warn("%s xmit: Local address not yet configured!\n",
939 p->name);
940 else if (!ipv6_addr_is_multicast(raddr) &&
941 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
942 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
943 p->name);
944 else
945 ret = 1;
946 rcu_read_unlock();
947 }
948 return ret;
949 }
950 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
951
952 /**
953 * ip6_tnl_xmit2 - encapsulate packet and send
954 * @skb: the outgoing socket buffer
955 * @dev: the outgoing tunnel device
956 * @dsfield: dscp code for outer header
957 * @fl: flow of tunneled packet
958 * @encap_limit: encapsulation limit
959 * @pmtu: Path MTU is stored if packet is too big
960 *
961 * Description:
962 * Build new header and do some sanity checks on the packet before sending
963 * it.
964 *
965 * Return:
966 * 0 on success
967 * -1 fail
968 * %-EMSGSIZE message too big. return mtu in this case.
969 **/
970
971 static int ip6_tnl_xmit2(struct sk_buff *skb,
972 struct net_device *dev,
973 __u8 dsfield,
974 struct flowi6 *fl6,
975 int encap_limit,
976 __u32 *pmtu)
977 {
978 struct ip6_tnl *t = netdev_priv(dev);
979 struct net *net = t->net;
980 struct net_device_stats *stats = &t->dev->stats;
981 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
982 struct ipv6_tel_txoption opt;
983 struct dst_entry *dst = NULL, *ndst = NULL;
984 struct net_device *tdev;
985 int mtu;
986 unsigned int max_headroom = sizeof(struct ipv6hdr);
987 u8 proto;
988 int err = -1;
989
990 /* NBMA tunnel */
991 if (ipv6_addr_any(&t->parms.raddr)) {
992 struct in6_addr *addr6;
993 struct neighbour *neigh;
994 int addr_type;
995
996 if (!skb_dst(skb))
997 goto tx_err_link_failure;
998
999 neigh = dst_neigh_lookup(skb_dst(skb),
1000 &ipv6_hdr(skb)->daddr);
1001 if (!neigh)
1002 goto tx_err_link_failure;
1003
1004 addr6 = (struct in6_addr *)&neigh->primary_key;
1005 addr_type = ipv6_addr_type(addr6);
1006
1007 if (addr_type == IPV6_ADDR_ANY)
1008 addr6 = &ipv6_hdr(skb)->daddr;
1009
1010 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1011 neigh_release(neigh);
1012 } else if (!fl6->flowi6_mark)
1013 dst = ip6_tnl_dst_check(t);
1014
1015 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1016 goto tx_err_link_failure;
1017
1018 if (!dst) {
1019 ndst = ip6_route_output(net, NULL, fl6);
1020
1021 if (ndst->error)
1022 goto tx_err_link_failure;
1023 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
1024 if (IS_ERR(ndst)) {
1025 err = PTR_ERR(ndst);
1026 ndst = NULL;
1027 goto tx_err_link_failure;
1028 }
1029 dst = ndst;
1030 }
1031
1032 tdev = dst->dev;
1033
1034 if (tdev == dev) {
1035 stats->collisions++;
1036 net_warn_ratelimited("%s: Local routing loop detected!\n",
1037 t->parms.name);
1038 goto tx_err_dst_release;
1039 }
1040 mtu = dst_mtu(dst) - sizeof(*ipv6h);
1041 if (encap_limit >= 0) {
1042 max_headroom += 8;
1043 mtu -= 8;
1044 }
1045 if (mtu < IPV6_MIN_MTU)
1046 mtu = IPV6_MIN_MTU;
1047 if (skb_dst(skb))
1048 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1049 if (skb->len > mtu) {
1050 *pmtu = mtu;
1051 err = -EMSGSIZE;
1052 goto tx_err_dst_release;
1053 }
1054
1055 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1056
1057 /*
1058 * Okay, now see if we can stuff it in the buffer as-is.
1059 */
1060 max_headroom += LL_RESERVED_SPACE(tdev);
1061
1062 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1063 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1064 struct sk_buff *new_skb;
1065
1066 new_skb = skb_realloc_headroom(skb, max_headroom);
1067 if (!new_skb)
1068 goto tx_err_dst_release;
1069
1070 if (skb->sk)
1071 skb_set_owner_w(new_skb, skb->sk);
1072 consume_skb(skb);
1073 skb = new_skb;
1074 }
1075 if (fl6->flowi6_mark) {
1076 skb_dst_set(skb, dst);
1077 ndst = NULL;
1078 } else {
1079 skb_dst_set_noref(skb, dst);
1080 }
1081 skb->transport_header = skb->network_header;
1082
1083 proto = fl6->flowi6_proto;
1084 if (encap_limit >= 0) {
1085 init_tel_txopt(&opt, encap_limit);
1086 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1087 }
1088
1089 if (likely(!skb->encapsulation)) {
1090 skb_reset_inner_headers(skb);
1091 skb->encapsulation = 1;
1092 }
1093
1094 skb_push(skb, sizeof(struct ipv6hdr));
1095 skb_reset_network_header(skb);
1096 ipv6h = ipv6_hdr(skb);
1097 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1098 ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
1099 ipv6h->hop_limit = t->parms.hop_limit;
1100 ipv6h->nexthdr = proto;
1101 ipv6h->saddr = fl6->saddr;
1102 ipv6h->daddr = fl6->daddr;
1103 ip6tunnel_xmit(NULL, skb, dev);
1104 if (ndst)
1105 ip6_tnl_dst_store(t, ndst);
1106 return 0;
1107 tx_err_link_failure:
1108 stats->tx_carrier_errors++;
1109 dst_link_failure(skb);
1110 tx_err_dst_release:
1111 dst_release(ndst);
1112 return err;
1113 }
1114
1115 static inline int
1116 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1117 {
1118 struct ip6_tnl *t = netdev_priv(dev);
1119 const struct iphdr *iph = ip_hdr(skb);
1120 int encap_limit = -1;
1121 struct flowi6 fl6;
1122 __u8 dsfield;
1123 __u32 mtu;
1124 u8 tproto;
1125 int err;
1126
1127 tproto = ACCESS_ONCE(t->parms.proto);
1128 if (tproto != IPPROTO_IPIP && tproto != 0)
1129 return -1;
1130
1131 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1132 encap_limit = t->parms.encap_limit;
1133
1134 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1135 fl6.flowi6_proto = IPPROTO_IPIP;
1136
1137 dsfield = ipv4_get_dsfield(iph);
1138
1139 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1140 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1141 & IPV6_TCLASS_MASK;
1142 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1143 fl6.flowi6_mark = skb->mark;
1144
1145 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1146 if (err != 0) {
1147 /* XXX: send ICMP error even if DF is not set. */
1148 if (err == -EMSGSIZE)
1149 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1150 htonl(mtu));
1151 return -1;
1152 }
1153
1154 return 0;
1155 }
1156
1157 static inline int
1158 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1159 {
1160 struct ip6_tnl *t = netdev_priv(dev);
1161 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1162 int encap_limit = -1;
1163 __u16 offset;
1164 struct flowi6 fl6;
1165 __u8 dsfield;
1166 __u32 mtu;
1167 u8 tproto;
1168 int err;
1169
1170 tproto = ACCESS_ONCE(t->parms.proto);
1171 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1172 ip6_tnl_addr_conflict(t, ipv6h))
1173 return -1;
1174
1175 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1176 if (offset > 0) {
1177 struct ipv6_tlv_tnl_enc_lim *tel;
1178 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1179 if (tel->encap_limit == 0) {
1180 icmpv6_send(skb, ICMPV6_PARAMPROB,
1181 ICMPV6_HDR_FIELD, offset + 2);
1182 return -1;
1183 }
1184 encap_limit = tel->encap_limit - 1;
1185 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1186 encap_limit = t->parms.encap_limit;
1187
1188 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1189 fl6.flowi6_proto = IPPROTO_IPV6;
1190
1191 dsfield = ipv6_get_dsfield(ipv6h);
1192 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1193 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1194 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1195 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1196 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1197 fl6.flowi6_mark = skb->mark;
1198
1199 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1200 if (err != 0) {
1201 if (err == -EMSGSIZE)
1202 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1203 return -1;
1204 }
1205
1206 return 0;
1207 }
1208
1209 static netdev_tx_t
1210 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1211 {
1212 struct ip6_tnl *t = netdev_priv(dev);
1213 struct net_device_stats *stats = &t->dev->stats;
1214 int ret;
1215
1216 switch (skb->protocol) {
1217 case htons(ETH_P_IP):
1218 ret = ip4ip6_tnl_xmit(skb, dev);
1219 break;
1220 case htons(ETH_P_IPV6):
1221 ret = ip6ip6_tnl_xmit(skb, dev);
1222 break;
1223 default:
1224 goto tx_err;
1225 }
1226
1227 if (ret < 0)
1228 goto tx_err;
1229
1230 return NETDEV_TX_OK;
1231
1232 tx_err:
1233 stats->tx_errors++;
1234 stats->tx_dropped++;
1235 kfree_skb(skb);
1236 return NETDEV_TX_OK;
1237 }
1238
1239 static void ip6_tnl_link_config(struct ip6_tnl *t)
1240 {
1241 struct net_device *dev = t->dev;
1242 struct __ip6_tnl_parm *p = &t->parms;
1243 struct flowi6 *fl6 = &t->fl.u.ip6;
1244
1245 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1246 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1247
1248 /* Set up flowi template */
1249 fl6->saddr = p->laddr;
1250 fl6->daddr = p->raddr;
1251 fl6->flowi6_oif = p->link;
1252 fl6->flowlabel = 0;
1253
1254 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1255 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1256 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1257 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1258
1259 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1260 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1261
1262 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1263 dev->flags |= IFF_POINTOPOINT;
1264 else
1265 dev->flags &= ~IFF_POINTOPOINT;
1266
1267 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1268 int strict = (ipv6_addr_type(&p->raddr) &
1269 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1270
1271 struct rt6_info *rt = rt6_lookup(t->net,
1272 &p->raddr, &p->laddr,
1273 p->link, strict);
1274
1275 if (!rt)
1276 return;
1277
1278 if (rt->dst.dev) {
1279 dev->hard_header_len = rt->dst.dev->hard_header_len +
1280 sizeof(struct ipv6hdr);
1281
1282 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
1283 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1284 dev->mtu -= 8;
1285
1286 if (dev->mtu < IPV6_MIN_MTU)
1287 dev->mtu = IPV6_MIN_MTU;
1288 }
1289 ip6_rt_put(rt);
1290 }
1291 }
1292
1293 /**
1294 * ip6_tnl_change - update the tunnel parameters
1295 * @t: tunnel to be changed
1296 * @p: tunnel configuration parameters
1297 *
1298 * Description:
1299 * ip6_tnl_change() updates the tunnel parameters
1300 **/
1301
1302 static int
1303 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1304 {
1305 t->parms.laddr = p->laddr;
1306 t->parms.raddr = p->raddr;
1307 t->parms.flags = p->flags;
1308 t->parms.hop_limit = p->hop_limit;
1309 t->parms.encap_limit = p->encap_limit;
1310 t->parms.flowinfo = p->flowinfo;
1311 t->parms.link = p->link;
1312 t->parms.proto = p->proto;
1313 ip6_tnl_dst_reset(t);
1314 ip6_tnl_link_config(t);
1315 return 0;
1316 }
1317
1318 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1319 {
1320 struct net *net = t->net;
1321 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1322 int err;
1323
1324 ip6_tnl_unlink(ip6n, t);
1325 synchronize_net();
1326 err = ip6_tnl_change(t, p);
1327 ip6_tnl_link(ip6n, t);
1328 netdev_state_change(t->dev);
1329 return err;
1330 }
1331
1332 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1333 {
1334 /* for default tnl0 device allow to change only the proto */
1335 t->parms.proto = p->proto;
1336 netdev_state_change(t->dev);
1337 return 0;
1338 }
1339
1340 static void
1341 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1342 {
1343 p->laddr = u->laddr;
1344 p->raddr = u->raddr;
1345 p->flags = u->flags;
1346 p->hop_limit = u->hop_limit;
1347 p->encap_limit = u->encap_limit;
1348 p->flowinfo = u->flowinfo;
1349 p->link = u->link;
1350 p->proto = u->proto;
1351 memcpy(p->name, u->name, sizeof(u->name));
1352 }
1353
1354 static void
1355 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1356 {
1357 u->laddr = p->laddr;
1358 u->raddr = p->raddr;
1359 u->flags = p->flags;
1360 u->hop_limit = p->hop_limit;
1361 u->encap_limit = p->encap_limit;
1362 u->flowinfo = p->flowinfo;
1363 u->link = p->link;
1364 u->proto = p->proto;
1365 memcpy(u->name, p->name, sizeof(u->name));
1366 }
1367
1368 /**
1369 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1370 * @dev: virtual device associated with tunnel
1371 * @ifr: parameters passed from userspace
1372 * @cmd: command to be performed
1373 *
1374 * Description:
1375 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1376 * from userspace.
1377 *
1378 * The possible commands are the following:
1379 * %SIOCGETTUNNEL: get tunnel parameters for device
1380 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1381 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1382 * %SIOCDELTUNNEL: delete tunnel
1383 *
1384 * The fallback device "ip6tnl0", created during module
1385 * initialization, can be used for creating other tunnel devices.
1386 *
1387 * Return:
1388 * 0 on success,
1389 * %-EFAULT if unable to copy data to or from userspace,
1390 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1391 * %-EINVAL if passed tunnel parameters are invalid,
1392 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1393 * %-ENODEV if attempting to change or delete a nonexisting device
1394 **/
1395
1396 static int
1397 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1398 {
1399 int err = 0;
1400 struct ip6_tnl_parm p;
1401 struct __ip6_tnl_parm p1;
1402 struct ip6_tnl *t = netdev_priv(dev);
1403 struct net *net = t->net;
1404 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1405
1406 switch (cmd) {
1407 case SIOCGETTUNNEL:
1408 if (dev == ip6n->fb_tnl_dev) {
1409 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1410 err = -EFAULT;
1411 break;
1412 }
1413 ip6_tnl_parm_from_user(&p1, &p);
1414 t = ip6_tnl_locate(net, &p1, 0);
1415 if (IS_ERR(t))
1416 t = netdev_priv(dev);
1417 } else {
1418 memset(&p, 0, sizeof(p));
1419 }
1420 ip6_tnl_parm_to_user(&p, &t->parms);
1421 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1422 err = -EFAULT;
1423 }
1424 break;
1425 case SIOCADDTUNNEL:
1426 case SIOCCHGTUNNEL:
1427 err = -EPERM;
1428 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1429 break;
1430 err = -EFAULT;
1431 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1432 break;
1433 err = -EINVAL;
1434 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1435 p.proto != 0)
1436 break;
1437 ip6_tnl_parm_from_user(&p1, &p);
1438 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1439 if (cmd == SIOCCHGTUNNEL) {
1440 if (!IS_ERR(t)) {
1441 if (t->dev != dev) {
1442 err = -EEXIST;
1443 break;
1444 }
1445 } else
1446 t = netdev_priv(dev);
1447 if (dev == ip6n->fb_tnl_dev)
1448 err = ip6_tnl0_update(t, &p1);
1449 else
1450 err = ip6_tnl_update(t, &p1);
1451 }
1452 if (!IS_ERR(t)) {
1453 err = 0;
1454 ip6_tnl_parm_to_user(&p, &t->parms);
1455 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1456 err = -EFAULT;
1457
1458 } else {
1459 err = PTR_ERR(t);
1460 }
1461 break;
1462 case SIOCDELTUNNEL:
1463 err = -EPERM;
1464 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1465 break;
1466
1467 if (dev == ip6n->fb_tnl_dev) {
1468 err = -EFAULT;
1469 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1470 break;
1471 err = -ENOENT;
1472 ip6_tnl_parm_from_user(&p1, &p);
1473 t = ip6_tnl_locate(net, &p1, 0);
1474 if (IS_ERR(t))
1475 break;
1476 err = -EPERM;
1477 if (t->dev == ip6n->fb_tnl_dev)
1478 break;
1479 dev = t->dev;
1480 }
1481 err = 0;
1482 unregister_netdevice(dev);
1483 break;
1484 default:
1485 err = -EINVAL;
1486 }
1487 return err;
1488 }
1489
1490 /**
1491 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1492 * @dev: virtual device associated with tunnel
1493 * @new_mtu: the new mtu
1494 *
1495 * Return:
1496 * 0 on success,
1497 * %-EINVAL if mtu too small
1498 **/
1499
1500 static int
1501 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1502 {
1503 struct ip6_tnl *tnl = netdev_priv(dev);
1504
1505 if (tnl->parms.proto == IPPROTO_IPIP) {
1506 if (new_mtu < 68)
1507 return -EINVAL;
1508 } else {
1509 if (new_mtu < IPV6_MIN_MTU)
1510 return -EINVAL;
1511 }
1512 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1513 return -EINVAL;
1514 dev->mtu = new_mtu;
1515 return 0;
1516 }
1517
1518 int ip6_tnl_get_iflink(const struct net_device *dev)
1519 {
1520 struct ip6_tnl *t = netdev_priv(dev);
1521
1522 return t->parms.link;
1523 }
1524 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1525
1526 static const struct net_device_ops ip6_tnl_netdev_ops = {
1527 .ndo_init = ip6_tnl_dev_init,
1528 .ndo_uninit = ip6_tnl_dev_uninit,
1529 .ndo_start_xmit = ip6_tnl_xmit,
1530 .ndo_do_ioctl = ip6_tnl_ioctl,
1531 .ndo_change_mtu = ip6_tnl_change_mtu,
1532 .ndo_get_stats = ip6_get_stats,
1533 .ndo_get_iflink = ip6_tnl_get_iflink,
1534 };
1535
1536
1537 /**
1538 * ip6_tnl_dev_setup - setup virtual tunnel device
1539 * @dev: virtual device associated with tunnel
1540 *
1541 * Description:
1542 * Initialize function pointers and device parameters
1543 **/
1544
1545 static void ip6_tnl_dev_setup(struct net_device *dev)
1546 {
1547 struct ip6_tnl *t;
1548
1549 dev->netdev_ops = &ip6_tnl_netdev_ops;
1550 dev->destructor = ip6_dev_free;
1551
1552 dev->type = ARPHRD_TUNNEL6;
1553 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1554 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
1555 t = netdev_priv(dev);
1556 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1557 dev->mtu -= 8;
1558 dev->flags |= IFF_NOARP;
1559 dev->addr_len = sizeof(struct in6_addr);
1560 netif_keep_dst(dev);
1561 /* This perm addr will be used as interface identifier by IPv6 */
1562 dev->addr_assign_type = NET_ADDR_RANDOM;
1563 eth_random_addr(dev->perm_addr);
1564 }
1565
1566
1567 /**
1568 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1569 * @dev: virtual device associated with tunnel
1570 **/
1571
1572 static inline int
1573 ip6_tnl_dev_init_gen(struct net_device *dev)
1574 {
1575 struct ip6_tnl *t = netdev_priv(dev);
1576
1577 t->dev = dev;
1578 t->net = dev_net(dev);
1579 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1580 if (!dev->tstats)
1581 return -ENOMEM;
1582 return 0;
1583 }
1584
1585 /**
1586 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1587 * @dev: virtual device associated with tunnel
1588 **/
1589
1590 static int ip6_tnl_dev_init(struct net_device *dev)
1591 {
1592 struct ip6_tnl *t = netdev_priv(dev);
1593 int err = ip6_tnl_dev_init_gen(dev);
1594
1595 if (err)
1596 return err;
1597 ip6_tnl_link_config(t);
1598 return 0;
1599 }
1600
1601 /**
1602 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1603 * @dev: fallback device
1604 *
1605 * Return: 0
1606 **/
1607
1608 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1609 {
1610 struct ip6_tnl *t = netdev_priv(dev);
1611 struct net *net = dev_net(dev);
1612 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1613
1614 t->parms.proto = IPPROTO_IPV6;
1615 dev_hold(dev);
1616
1617 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1618 return 0;
1619 }
1620
1621 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1622 {
1623 u8 proto;
1624
1625 if (!data || !data[IFLA_IPTUN_PROTO])
1626 return 0;
1627
1628 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1629 if (proto != IPPROTO_IPV6 &&
1630 proto != IPPROTO_IPIP &&
1631 proto != 0)
1632 return -EINVAL;
1633
1634 return 0;
1635 }
1636
1637 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1638 struct __ip6_tnl_parm *parms)
1639 {
1640 memset(parms, 0, sizeof(*parms));
1641
1642 if (!data)
1643 return;
1644
1645 if (data[IFLA_IPTUN_LINK])
1646 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1647
1648 if (data[IFLA_IPTUN_LOCAL])
1649 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1650
1651 if (data[IFLA_IPTUN_REMOTE])
1652 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1653
1654 if (data[IFLA_IPTUN_TTL])
1655 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1656
1657 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1658 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1659
1660 if (data[IFLA_IPTUN_FLOWINFO])
1661 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1662
1663 if (data[IFLA_IPTUN_FLAGS])
1664 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1665
1666 if (data[IFLA_IPTUN_PROTO])
1667 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1668 }
1669
1670 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1671 struct nlattr *tb[], struct nlattr *data[])
1672 {
1673 struct net *net = dev_net(dev);
1674 struct ip6_tnl *nt, *t;
1675
1676 nt = netdev_priv(dev);
1677 ip6_tnl_netlink_parms(data, &nt->parms);
1678
1679 t = ip6_tnl_locate(net, &nt->parms, 0);
1680 if (!IS_ERR(t))
1681 return -EEXIST;
1682
1683 return ip6_tnl_create2(dev);
1684 }
1685
1686 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1687 struct nlattr *data[])
1688 {
1689 struct ip6_tnl *t = netdev_priv(dev);
1690 struct __ip6_tnl_parm p;
1691 struct net *net = t->net;
1692 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1693
1694 if (dev == ip6n->fb_tnl_dev)
1695 return -EINVAL;
1696
1697 ip6_tnl_netlink_parms(data, &p);
1698
1699 t = ip6_tnl_locate(net, &p, 0);
1700 if (!IS_ERR(t)) {
1701 if (t->dev != dev)
1702 return -EEXIST;
1703 } else
1704 t = netdev_priv(dev);
1705
1706 return ip6_tnl_update(t, &p);
1707 }
1708
1709 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1710 {
1711 struct net *net = dev_net(dev);
1712 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1713
1714 if (dev != ip6n->fb_tnl_dev)
1715 unregister_netdevice_queue(dev, head);
1716 }
1717
1718 static size_t ip6_tnl_get_size(const struct net_device *dev)
1719 {
1720 return
1721 /* IFLA_IPTUN_LINK */
1722 nla_total_size(4) +
1723 /* IFLA_IPTUN_LOCAL */
1724 nla_total_size(sizeof(struct in6_addr)) +
1725 /* IFLA_IPTUN_REMOTE */
1726 nla_total_size(sizeof(struct in6_addr)) +
1727 /* IFLA_IPTUN_TTL */
1728 nla_total_size(1) +
1729 /* IFLA_IPTUN_ENCAP_LIMIT */
1730 nla_total_size(1) +
1731 /* IFLA_IPTUN_FLOWINFO */
1732 nla_total_size(4) +
1733 /* IFLA_IPTUN_FLAGS */
1734 nla_total_size(4) +
1735 /* IFLA_IPTUN_PROTO */
1736 nla_total_size(1) +
1737 0;
1738 }
1739
1740 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1741 {
1742 struct ip6_tnl *tunnel = netdev_priv(dev);
1743 struct __ip6_tnl_parm *parm = &tunnel->parms;
1744
1745 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1746 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1747 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
1748 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1749 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1750 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1751 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1752 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1753 goto nla_put_failure;
1754 return 0;
1755
1756 nla_put_failure:
1757 return -EMSGSIZE;
1758 }
1759
1760 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1761 {
1762 struct ip6_tnl *tunnel = netdev_priv(dev);
1763
1764 return tunnel->net;
1765 }
1766 EXPORT_SYMBOL(ip6_tnl_get_link_net);
1767
1768 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1769 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1770 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1771 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1772 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1773 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1774 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1775 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1776 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1777 };
1778
1779 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1780 .kind = "ip6tnl",
1781 .maxtype = IFLA_IPTUN_MAX,
1782 .policy = ip6_tnl_policy,
1783 .priv_size = sizeof(struct ip6_tnl),
1784 .setup = ip6_tnl_dev_setup,
1785 .validate = ip6_tnl_validate,
1786 .newlink = ip6_tnl_newlink,
1787 .changelink = ip6_tnl_changelink,
1788 .dellink = ip6_tnl_dellink,
1789 .get_size = ip6_tnl_get_size,
1790 .fill_info = ip6_tnl_fill_info,
1791 .get_link_net = ip6_tnl_get_link_net,
1792 };
1793
1794 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1795 .handler = ip4ip6_rcv,
1796 .err_handler = ip4ip6_err,
1797 .priority = 1,
1798 };
1799
1800 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1801 .handler = ip6ip6_rcv,
1802 .err_handler = ip6ip6_err,
1803 .priority = 1,
1804 };
1805
1806 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1807 {
1808 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1809 struct net_device *dev, *aux;
1810 int h;
1811 struct ip6_tnl *t;
1812 LIST_HEAD(list);
1813
1814 for_each_netdev_safe(net, dev, aux)
1815 if (dev->rtnl_link_ops == &ip6_link_ops)
1816 unregister_netdevice_queue(dev, &list);
1817
1818 for (h = 0; h < HASH_SIZE; h++) {
1819 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1820 while (t) {
1821 /* If dev is in the same netns, it has already
1822 * been added to the list by the previous loop.
1823 */
1824 if (!net_eq(dev_net(t->dev), net))
1825 unregister_netdevice_queue(t->dev, &list);
1826 t = rtnl_dereference(t->next);
1827 }
1828 }
1829
1830 unregister_netdevice_many(&list);
1831 }
1832
1833 static int __net_init ip6_tnl_init_net(struct net *net)
1834 {
1835 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1836 struct ip6_tnl *t = NULL;
1837 int err;
1838
1839 ip6n->tnls[0] = ip6n->tnls_wc;
1840 ip6n->tnls[1] = ip6n->tnls_r_l;
1841
1842 err = -ENOMEM;
1843 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1844 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1845
1846 if (!ip6n->fb_tnl_dev)
1847 goto err_alloc_dev;
1848 dev_net_set(ip6n->fb_tnl_dev, net);
1849 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1850 /* FB netdevice is special: we have one, and only one per netns.
1851 * Allowing to move it to another netns is clearly unsafe.
1852 */
1853 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1854
1855 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1856 if (err < 0)
1857 goto err_register;
1858
1859 err = register_netdev(ip6n->fb_tnl_dev);
1860 if (err < 0)
1861 goto err_register;
1862
1863 t = netdev_priv(ip6n->fb_tnl_dev);
1864
1865 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1866 return 0;
1867
1868 err_register:
1869 ip6_dev_free(ip6n->fb_tnl_dev);
1870 err_alloc_dev:
1871 return err;
1872 }
1873
1874 static void __net_exit ip6_tnl_exit_net(struct net *net)
1875 {
1876 rtnl_lock();
1877 ip6_tnl_destroy_tunnels(net);
1878 rtnl_unlock();
1879 }
1880
1881 static struct pernet_operations ip6_tnl_net_ops = {
1882 .init = ip6_tnl_init_net,
1883 .exit = ip6_tnl_exit_net,
1884 .id = &ip6_tnl_net_id,
1885 .size = sizeof(struct ip6_tnl_net),
1886 };
1887
1888 /**
1889 * ip6_tunnel_init - register protocol and reserve needed resources
1890 *
1891 * Return: 0 on success
1892 **/
1893
1894 static int __init ip6_tunnel_init(void)
1895 {
1896 int err;
1897
1898 err = register_pernet_device(&ip6_tnl_net_ops);
1899 if (err < 0)
1900 goto out_pernet;
1901
1902 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1903 if (err < 0) {
1904 pr_err("%s: can't register ip4ip6\n", __func__);
1905 goto out_ip4ip6;
1906 }
1907
1908 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1909 if (err < 0) {
1910 pr_err("%s: can't register ip6ip6\n", __func__);
1911 goto out_ip6ip6;
1912 }
1913 err = rtnl_link_register(&ip6_link_ops);
1914 if (err < 0)
1915 goto rtnl_link_failed;
1916
1917 return 0;
1918
1919 rtnl_link_failed:
1920 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1921 out_ip6ip6:
1922 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1923 out_ip4ip6:
1924 unregister_pernet_device(&ip6_tnl_net_ops);
1925 out_pernet:
1926 return err;
1927 }
1928
1929 /**
1930 * ip6_tunnel_cleanup - free resources and unregister protocol
1931 **/
1932
1933 static void __exit ip6_tunnel_cleanup(void)
1934 {
1935 rtnl_link_unregister(&ip6_link_ops);
1936 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1937 pr_info("%s: can't deregister ip4ip6\n", __func__);
1938
1939 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1940 pr_info("%s: can't deregister ip6ip6\n", __func__);
1941
1942 unregister_pernet_device(&ip6_tnl_net_ops);
1943 }
1944
1945 module_init(ip6_tunnel_init);
1946 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support