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Linux/net/ipv6/ip6_tunnel.c

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  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 #ifdef IP6_TNL_DEBUG
 68 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
 69 #else
 70 #define IP6_TNL_TRACE(x...) do {;} while(0)
 71 #endif
 72 
 73 #define HASH_SIZE_SHIFT  5
 74 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
 75 
 76 static bool log_ecn_error = true;
 77 module_param(log_ecn_error, bool, 0644);
 78 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
 79 
 80 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
 81 {
 82         u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
 83 
 84         return hash_32(hash, HASH_SIZE_SHIFT);
 85 }
 86 
 87 static int ip6_tnl_dev_init(struct net_device *dev);
 88 static void ip6_tnl_dev_setup(struct net_device *dev);
 89 static struct rtnl_link_ops ip6_link_ops __read_mostly;
 90 
 91 static int ip6_tnl_net_id __read_mostly;
 92 struct ip6_tnl_net {
 93         /* the IPv6 tunnel fallback device */
 94         struct net_device *fb_tnl_dev;
 95         /* lists for storing tunnels in use */
 96         struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
 97         struct ip6_tnl __rcu *tnls_wc[1];
 98         struct ip6_tnl __rcu **tnls[2];
 99 };
100 
101 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
102 {
103         struct pcpu_sw_netstats tmp, sum = { 0 };
104         int i;
105 
106         for_each_possible_cpu(i) {
107                 unsigned int start;
108                 const struct pcpu_sw_netstats *tstats =
109                                                    per_cpu_ptr(dev->tstats, i);
110 
111                 do {
112                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
113                         tmp.rx_packets = tstats->rx_packets;
114                         tmp.rx_bytes = tstats->rx_bytes;
115                         tmp.tx_packets = tstats->tx_packets;
116                         tmp.tx_bytes =  tstats->tx_bytes;
117                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
118 
119                 sum.rx_packets += tmp.rx_packets;
120                 sum.rx_bytes   += tmp.rx_bytes;
121                 sum.tx_packets += tmp.tx_packets;
122                 sum.tx_bytes   += tmp.tx_bytes;
123         }
124         dev->stats.rx_packets = sum.rx_packets;
125         dev->stats.rx_bytes   = sum.rx_bytes;
126         dev->stats.tx_packets = sum.tx_packets;
127         dev->stats.tx_bytes   = sum.tx_bytes;
128         return &dev->stats;
129 }
130 
131 /*
132  * Locking : hash tables are protected by RCU and RTNL
133  */
134 
135 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
136 {
137         struct dst_entry *dst = t->dst_cache;
138 
139         if (dst && dst->obsolete &&
140             dst->ops->check(dst, t->dst_cookie) == NULL) {
141                 t->dst_cache = NULL;
142                 dst_release(dst);
143                 return NULL;
144         }
145 
146         return dst;
147 }
148 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
149 
150 void ip6_tnl_dst_reset(struct ip6_tnl *t)
151 {
152         dst_release(t->dst_cache);
153         t->dst_cache = NULL;
154 }
155 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
156 
157 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
158 {
159         struct rt6_info *rt = (struct rt6_info *) dst;
160         t->dst_cookie = rt6_get_cookie(rt);
161         dst_release(t->dst_cache);
162         t->dst_cache = dst;
163 }
164 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
165 
166 /**
167  * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
168  *   @remote: the address of the tunnel exit-point
169  *   @local: the address of the tunnel entry-point
170  *
171  * Return:
172  *   tunnel matching given end-points if found,
173  *   else fallback tunnel if its device is up,
174  *   else %NULL
175  **/
176 
177 #define for_each_ip6_tunnel_rcu(start) \
178         for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
179 
180 static struct ip6_tnl *
181 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
182 {
183         unsigned int hash = HASH(remote, local);
184         struct ip6_tnl *t;
185         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
186 
187         for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
188                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
189                     ipv6_addr_equal(remote, &t->parms.raddr) &&
190                     (t->dev->flags & IFF_UP))
191                         return t;
192         }
193         t = rcu_dereference(ip6n->tnls_wc[0]);
194         if (t && (t->dev->flags & IFF_UP))
195                 return t;
196 
197         return NULL;
198 }
199 
200 /**
201  * ip6_tnl_bucket - get head of list matching given tunnel parameters
202  *   @p: parameters containing tunnel end-points
203  *
204  * Description:
205  *   ip6_tnl_bucket() returns the head of the list matching the
206  *   &struct in6_addr entries laddr and raddr in @p.
207  *
208  * Return: head of IPv6 tunnel list
209  **/
210 
211 static struct ip6_tnl __rcu **
212 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
213 {
214         const struct in6_addr *remote = &p->raddr;
215         const struct in6_addr *local = &p->laddr;
216         unsigned int h = 0;
217         int prio = 0;
218 
219         if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
220                 prio = 1;
221                 h = HASH(remote, local);
222         }
223         return &ip6n->tnls[prio][h];
224 }
225 
226 /**
227  * ip6_tnl_link - add tunnel to hash table
228  *   @t: tunnel to be added
229  **/
230 
231 static void
232 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
233 {
234         struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
235 
236         rcu_assign_pointer(t->next , rtnl_dereference(*tp));
237         rcu_assign_pointer(*tp, t);
238 }
239 
240 /**
241  * ip6_tnl_unlink - remove tunnel from hash table
242  *   @t: tunnel to be removed
243  **/
244 
245 static void
246 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
247 {
248         struct ip6_tnl __rcu **tp;
249         struct ip6_tnl *iter;
250 
251         for (tp = ip6_tnl_bucket(ip6n, &t->parms);
252              (iter = rtnl_dereference(*tp)) != NULL;
253              tp = &iter->next) {
254                 if (t == iter) {
255                         rcu_assign_pointer(*tp, t->next);
256                         break;
257                 }
258         }
259 }
260 
261 static void ip6_dev_free(struct net_device *dev)
262 {
263         free_percpu(dev->tstats);
264         free_netdev(dev);
265 }
266 
267 static int ip6_tnl_create2(struct net_device *dev)
268 {
269         struct ip6_tnl *t = netdev_priv(dev);
270         struct net *net = dev_net(dev);
271         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
272         int err;
273 
274         t = netdev_priv(dev);
275 
276         dev->rtnl_link_ops = &ip6_link_ops;
277         err = register_netdevice(dev);
278         if (err < 0)
279                 goto out;
280 
281         strcpy(t->parms.name, dev->name);
282 
283         dev_hold(dev);
284         ip6_tnl_link(ip6n, t);
285         return 0;
286 
287 out:
288         return err;
289 }
290 
291 /**
292  * ip6_tnl_create - create a new tunnel
293  *   @p: tunnel parameters
294  *   @pt: pointer to new tunnel
295  *
296  * Description:
297  *   Create tunnel matching given parameters.
298  *
299  * Return:
300  *   created tunnel or NULL
301  **/
302 
303 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
304 {
305         struct net_device *dev;
306         struct ip6_tnl *t;
307         char name[IFNAMSIZ];
308         int err;
309 
310         if (p->name[0]) {
311                 if (!dev_valid_name(p->name))
312                         goto failed;
313                 strlcpy(name, p->name, IFNAMSIZ);
314         } else {
315                 sprintf(name, "ip6tnl%%d");
316         }
317         dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
318         if (dev == NULL)
319                 goto failed;
320 
321         dev_net_set(dev, net);
322 
323         t = netdev_priv(dev);
324         t->parms = *p;
325         t->net = dev_net(dev);
326         err = ip6_tnl_create2(dev);
327         if (err < 0)
328                 goto failed_free;
329 
330         return t;
331 
332 failed_free:
333         ip6_dev_free(dev);
334 failed:
335         return NULL;
336 }
337 
338 /**
339  * ip6_tnl_locate - find or create tunnel matching given parameters
340  *   @p: tunnel parameters
341  *   @create: != 0 if allowed to create new tunnel if no match found
342  *
343  * Description:
344  *   ip6_tnl_locate() first tries to locate an existing tunnel
345  *   based on @parms. If this is unsuccessful, but @create is set a new
346  *   tunnel device is created and registered for use.
347  *
348  * Return:
349  *   matching tunnel or NULL
350  **/
351 
352 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
353                 struct __ip6_tnl_parm *p, int create)
354 {
355         const struct in6_addr *remote = &p->raddr;
356         const struct in6_addr *local = &p->laddr;
357         struct ip6_tnl __rcu **tp;
358         struct ip6_tnl *t;
359         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
360 
361         for (tp = ip6_tnl_bucket(ip6n, p);
362              (t = rtnl_dereference(*tp)) != NULL;
363              tp = &t->next) {
364                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
365                     ipv6_addr_equal(remote, &t->parms.raddr))
366                         return t;
367         }
368         if (!create)
369                 return NULL;
370         return ip6_tnl_create(net, p);
371 }
372 
373 /**
374  * ip6_tnl_dev_uninit - tunnel device uninitializer
375  *   @dev: the device to be destroyed
376  *
377  * Description:
378  *   ip6_tnl_dev_uninit() removes tunnel from its list
379  **/
380 
381 static void
382 ip6_tnl_dev_uninit(struct net_device *dev)
383 {
384         struct ip6_tnl *t = netdev_priv(dev);
385         struct net *net = t->net;
386         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
387 
388         if (dev == ip6n->fb_tnl_dev)
389                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
390         else
391                 ip6_tnl_unlink(ip6n, t);
392         ip6_tnl_dst_reset(t);
393         dev_put(dev);
394 }
395 
396 /**
397  * parse_tvl_tnl_enc_lim - handle encapsulation limit option
398  *   @skb: received socket buffer
399  *
400  * Return:
401  *   0 if none was found,
402  *   else index to encapsulation limit
403  **/
404 
405 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
406 {
407         const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
408         unsigned int nhoff = raw - skb->data;
409         unsigned int off = nhoff + sizeof(*ipv6h);
410         u8 next, nexthdr = ipv6h->nexthdr;
411 
412         while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
413                 struct ipv6_opt_hdr *hdr;
414                 u16 optlen;
415 
416                 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
417                         break;
418 
419                 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
420                 if (nexthdr == NEXTHDR_FRAGMENT) {
421                         struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
422                         if (frag_hdr->frag_off)
423                                 break;
424                         optlen = 8;
425                 } else if (nexthdr == NEXTHDR_AUTH) {
426                         optlen = (hdr->hdrlen + 2) << 2;
427                 } else {
428                         optlen = ipv6_optlen(hdr);
429                 }
430                 /* cache hdr->nexthdr, since pskb_may_pull() might
431                  * invalidate hdr
432                  */
433                 next = hdr->nexthdr;
434                 if (nexthdr == NEXTHDR_DEST) {
435                         u16 i = 2;
436 
437                         /* Remember : hdr is no longer valid at this point. */
438                         if (!pskb_may_pull(skb, off + optlen))
439                                 break;
440 
441                         while (1) {
442                                 struct ipv6_tlv_tnl_enc_lim *tel;
443 
444                                 /* No more room for encapsulation limit */
445                                 if (i + sizeof(*tel) > optlen)
446                                         break;
447 
448                                 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
449                                 /* return index of option if found and valid */
450                                 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
451                                     tel->length == 1)
452                                         return i + off - nhoff;
453                                 /* else jump to next option */
454                                 if (tel->type)
455                                         i += tel->length + 2;
456                                 else
457                                         i++;
458                         }
459                 }
460                 nexthdr = next;
461                 off += optlen;
462         }
463         return 0;
464 }
465 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
466 
467 /**
468  * ip6_tnl_err - tunnel error handler
469  *
470  * Description:
471  *   ip6_tnl_err() should handle errors in the tunnel according
472  *   to the specifications in RFC 2473.
473  **/
474 
475 static int
476 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
477             u8 *type, u8 *code, int *msg, __u32 *info, int offset)
478 {
479         const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
480         struct ip6_tnl *t;
481         int rel_msg = 0;
482         u8 rel_type = ICMPV6_DEST_UNREACH;
483         u8 rel_code = ICMPV6_ADDR_UNREACH;
484         __u32 rel_info = 0;
485         __u16 len;
486         int err = -ENOENT;
487 
488         /* If the packet doesn't contain the original IPv6 header we are
489            in trouble since we might need the source address for further
490            processing of the error. */
491 
492         rcu_read_lock();
493         if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
494                                         &ipv6h->saddr)) == NULL)
495                 goto out;
496 
497         if (t->parms.proto != ipproto && t->parms.proto != 0)
498                 goto out;
499 
500         err = 0;
501 
502         switch (*type) {
503                 __u32 teli;
504                 struct ipv6_tlv_tnl_enc_lim *tel;
505                 __u32 mtu;
506         case ICMPV6_DEST_UNREACH:
507                 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
508                                      t->parms.name);
509                 rel_msg = 1;
510                 break;
511         case ICMPV6_TIME_EXCEED:
512                 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
513                         net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
514                                              t->parms.name);
515                         rel_msg = 1;
516                 }
517                 break;
518         case ICMPV6_PARAMPROB:
519                 teli = 0;
520                 if ((*code) == ICMPV6_HDR_FIELD)
521                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
522 
523                 if (teli && teli == *info - 2) {
524                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
525                         if (tel->encap_limit == 0) {
526                                 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
527                                                      t->parms.name);
528                                 rel_msg = 1;
529                         }
530                 } else {
531                         net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
532                                              t->parms.name);
533                 }
534                 break;
535         case ICMPV6_PKT_TOOBIG:
536                 mtu = *info - offset;
537                 if (mtu < IPV6_MIN_MTU)
538                         mtu = IPV6_MIN_MTU;
539                 t->dev->mtu = mtu;
540 
541                 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
542                         rel_type = ICMPV6_PKT_TOOBIG;
543                         rel_code = 0;
544                         rel_info = mtu;
545                         rel_msg = 1;
546                 }
547                 break;
548         }
549 
550         *type = rel_type;
551         *code = rel_code;
552         *info = rel_info;
553         *msg = rel_msg;
554 
555 out:
556         rcu_read_unlock();
557         return err;
558 }
559 
560 static int
561 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
562            u8 type, u8 code, int offset, __be32 info)
563 {
564         int rel_msg = 0;
565         u8 rel_type = type;
566         u8 rel_code = code;
567         __u32 rel_info = ntohl(info);
568         int err;
569         struct sk_buff *skb2;
570         const struct iphdr *eiph;
571         struct rtable *rt;
572         struct flowi4 fl4;
573 
574         err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
575                           &rel_msg, &rel_info, offset);
576         if (err < 0)
577                 return err;
578 
579         if (rel_msg == 0)
580                 return 0;
581 
582         switch (rel_type) {
583         case ICMPV6_DEST_UNREACH:
584                 if (rel_code != ICMPV6_ADDR_UNREACH)
585                         return 0;
586                 rel_type = ICMP_DEST_UNREACH;
587                 rel_code = ICMP_HOST_UNREACH;
588                 break;
589         case ICMPV6_PKT_TOOBIG:
590                 if (rel_code != 0)
591                         return 0;
592                 rel_type = ICMP_DEST_UNREACH;
593                 rel_code = ICMP_FRAG_NEEDED;
594                 break;
595         case NDISC_REDIRECT:
596                 rel_type = ICMP_REDIRECT;
597                 rel_code = ICMP_REDIR_HOST;
598         default:
599                 return 0;
600         }
601 
602         if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
603                 return 0;
604 
605         skb2 = skb_clone(skb, GFP_ATOMIC);
606         if (!skb2)
607                 return 0;
608 
609         skb_dst_drop(skb2);
610 
611         skb_pull(skb2, offset);
612         skb_reset_network_header(skb2);
613         eiph = ip_hdr(skb2);
614 
615         /* Try to guess incoming interface */
616         rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
617                                    eiph->saddr, 0,
618                                    0, 0,
619                                    IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
620         if (IS_ERR(rt))
621                 goto out;
622 
623         skb2->dev = rt->dst.dev;
624 
625         /* route "incoming" packet */
626         if (rt->rt_flags & RTCF_LOCAL) {
627                 ip_rt_put(rt);
628                 rt = NULL;
629                 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
630                                            eiph->daddr, eiph->saddr,
631                                            0, 0,
632                                            IPPROTO_IPIP,
633                                            RT_TOS(eiph->tos), 0);
634                 if (IS_ERR(rt) ||
635                     rt->dst.dev->type != ARPHRD_TUNNEL) {
636                         if (!IS_ERR(rt))
637                                 ip_rt_put(rt);
638                         goto out;
639                 }
640                 skb_dst_set(skb2, &rt->dst);
641         } else {
642                 ip_rt_put(rt);
643                 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
644                                    skb2->dev) ||
645                     skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
646                         goto out;
647         }
648 
649         /* change mtu on this route */
650         if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
651                 if (rel_info > dst_mtu(skb_dst(skb2)))
652                         goto out;
653 
654                 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
655         }
656         if (rel_type == ICMP_REDIRECT)
657                 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
658 
659         icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
660 
661 out:
662         kfree_skb(skb2);
663         return 0;
664 }
665 
666 static int
667 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
668            u8 type, u8 code, int offset, __be32 info)
669 {
670         int rel_msg = 0;
671         u8 rel_type = type;
672         u8 rel_code = code;
673         __u32 rel_info = ntohl(info);
674         int err;
675 
676         err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
677                           &rel_msg, &rel_info, offset);
678         if (err < 0)
679                 return err;
680 
681         if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
682                 struct rt6_info *rt;
683                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
684 
685                 if (!skb2)
686                         return 0;
687 
688                 skb_dst_drop(skb2);
689                 skb_pull(skb2, offset);
690                 skb_reset_network_header(skb2);
691 
692                 /* Try to guess incoming interface */
693                 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
694                                 NULL, 0, 0);
695 
696                 if (rt && rt->dst.dev)
697                         skb2->dev = rt->dst.dev;
698 
699                 icmpv6_send(skb2, rel_type, rel_code, rel_info);
700 
701                 ip6_rt_put(rt);
702 
703                 kfree_skb(skb2);
704         }
705 
706         return 0;
707 }
708 
709 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
710                                        const struct ipv6hdr *ipv6h,
711                                        struct sk_buff *skb)
712 {
713         __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
714 
715         if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
716                 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
717 
718         return IP6_ECN_decapsulate(ipv6h, skb);
719 }
720 
721 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
722                                        const struct ipv6hdr *ipv6h,
723                                        struct sk_buff *skb)
724 {
725         if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
726                 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
727 
728         return IP6_ECN_decapsulate(ipv6h, skb);
729 }
730 
731 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
732                              const struct in6_addr *laddr,
733                              const struct in6_addr *raddr)
734 {
735         struct __ip6_tnl_parm *p = &t->parms;
736         int ltype = ipv6_addr_type(laddr);
737         int rtype = ipv6_addr_type(raddr);
738         __u32 flags = 0;
739 
740         if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
741                 flags = IP6_TNL_F_CAP_PER_PACKET;
742         } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
743                    rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
744                    !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
745                    (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
746                 if (ltype&IPV6_ADDR_UNICAST)
747                         flags |= IP6_TNL_F_CAP_XMIT;
748                 if (rtype&IPV6_ADDR_UNICAST)
749                         flags |= IP6_TNL_F_CAP_RCV;
750         }
751         return flags;
752 }
753 EXPORT_SYMBOL(ip6_tnl_get_cap);
754 
755 /* called with rcu_read_lock() */
756 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
757                                   const struct in6_addr *laddr,
758                                   const struct in6_addr *raddr)
759 {
760         struct __ip6_tnl_parm *p = &t->parms;
761         int ret = 0;
762         struct net *net = t->net;
763 
764         if ((p->flags & IP6_TNL_F_CAP_RCV) ||
765             ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
766              (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
767                 struct net_device *ldev = NULL;
768 
769                 if (p->link)
770                         ldev = dev_get_by_index_rcu(net, p->link);
771 
772                 if ((ipv6_addr_is_multicast(laddr) ||
773                      likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
774                     likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
775                         ret = 1;
776         }
777         return ret;
778 }
779 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
780 
781 /**
782  * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
783  *   @skb: received socket buffer
784  *   @protocol: ethernet protocol ID
785  *   @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
786  *
787  * Return: 0
788  **/
789 
790 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
791                        __u8 ipproto,
792                        int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
793                                                    const struct ipv6hdr *ipv6h,
794                                                    struct sk_buff *skb))
795 {
796         struct ip6_tnl *t;
797         const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
798         int err;
799 
800         rcu_read_lock();
801 
802         if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
803                                         &ipv6h->daddr)) != NULL) {
804                 struct pcpu_sw_netstats *tstats;
805 
806                 if (t->parms.proto != ipproto && t->parms.proto != 0) {
807                         rcu_read_unlock();
808                         goto discard;
809                 }
810 
811                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
812                         rcu_read_unlock();
813                         goto discard;
814                 }
815 
816                 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
817                         t->dev->stats.rx_dropped++;
818                         rcu_read_unlock();
819                         goto discard;
820                 }
821                 skb->mac_header = skb->network_header;
822                 skb_reset_network_header(skb);
823                 skb->protocol = htons(protocol);
824                 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
825 
826                 __skb_tunnel_rx(skb, t->dev, t->net);
827 
828                 err = dscp_ecn_decapsulate(t, ipv6h, skb);
829                 if (unlikely(err)) {
830                         if (log_ecn_error)
831                                 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
832                                                      &ipv6h->saddr,
833                                                      ipv6_get_dsfield(ipv6h));
834                         if (err > 1) {
835                                 ++t->dev->stats.rx_frame_errors;
836                                 ++t->dev->stats.rx_errors;
837                                 rcu_read_unlock();
838                                 goto discard;
839                         }
840                 }
841 
842                 tstats = this_cpu_ptr(t->dev->tstats);
843                 u64_stats_update_begin(&tstats->syncp);
844                 tstats->rx_packets++;
845                 tstats->rx_bytes += skb->len;
846                 u64_stats_update_end(&tstats->syncp);
847 
848                 netif_rx(skb);
849 
850                 rcu_read_unlock();
851                 return 0;
852         }
853         rcu_read_unlock();
854         return 1;
855 
856 discard:
857         kfree_skb(skb);
858         return 0;
859 }
860 
861 static int ip4ip6_rcv(struct sk_buff *skb)
862 {
863         return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
864                            ip4ip6_dscp_ecn_decapsulate);
865 }
866 
867 static int ip6ip6_rcv(struct sk_buff *skb)
868 {
869         return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
870                            ip6ip6_dscp_ecn_decapsulate);
871 }
872 
873 struct ipv6_tel_txoption {
874         struct ipv6_txoptions ops;
875         __u8 dst_opt[8];
876 };
877 
878 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
879 {
880         memset(opt, 0, sizeof(struct ipv6_tel_txoption));
881 
882         opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
883         opt->dst_opt[3] = 1;
884         opt->dst_opt[4] = encap_limit;
885         opt->dst_opt[5] = IPV6_TLV_PADN;
886         opt->dst_opt[6] = 1;
887 
888         opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
889         opt->ops.opt_nflen = 8;
890 }
891 
892 /**
893  * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
894  *   @t: the outgoing tunnel device
895  *   @hdr: IPv6 header from the incoming packet
896  *
897  * Description:
898  *   Avoid trivial tunneling loop by checking that tunnel exit-point
899  *   doesn't match source of incoming packet.
900  *
901  * Return:
902  *   1 if conflict,
903  *   0 else
904  **/
905 
906 static inline bool
907 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
908 {
909         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
910 }
911 
912 int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
913 {
914         struct __ip6_tnl_parm *p = &t->parms;
915         int ret = 0;
916         struct net *net = t->net;
917 
918         if (p->flags & IP6_TNL_F_CAP_XMIT) {
919                 struct net_device *ldev = NULL;
920 
921                 rcu_read_lock();
922                 if (p->link)
923                         ldev = dev_get_by_index_rcu(net, p->link);
924 
925                 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
926                         pr_warn("%s xmit: Local address not yet configured!\n",
927                                 p->name);
928                 else if (!ipv6_addr_is_multicast(&p->raddr) &&
929                          unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
930                         pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
931                                 p->name);
932                 else
933                         ret = 1;
934                 rcu_read_unlock();
935         }
936         return ret;
937 }
938 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
939 
940 /**
941  * ip6_tnl_xmit2 - encapsulate packet and send
942  *   @skb: the outgoing socket buffer
943  *   @dev: the outgoing tunnel device
944  *   @dsfield: dscp code for outer header
945  *   @fl: flow of tunneled packet
946  *   @encap_limit: encapsulation limit
947  *   @pmtu: Path MTU is stored if packet is too big
948  *
949  * Description:
950  *   Build new header and do some sanity checks on the packet before sending
951  *   it.
952  *
953  * Return:
954  *   0 on success
955  *   -1 fail
956  *   %-EMSGSIZE message too big. return mtu in this case.
957  **/
958 
959 static int ip6_tnl_xmit2(struct sk_buff *skb,
960                          struct net_device *dev,
961                          __u8 dsfield,
962                          struct flowi6 *fl6,
963                          int encap_limit,
964                          __u32 *pmtu)
965 {
966         struct ip6_tnl *t = netdev_priv(dev);
967         struct net *net = t->net;
968         struct net_device_stats *stats = &t->dev->stats;
969         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
970         struct ipv6_tel_txoption opt;
971         struct dst_entry *dst = NULL, *ndst = NULL;
972         struct net_device *tdev;
973         bool use_cache = false;
974         int mtu;
975         unsigned int max_headroom = sizeof(struct ipv6hdr);
976         u8 proto;
977         int err = -1;
978 
979         if (!(t->parms.flags &
980                      (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) {
981                 /* enable the cache only only if the routing decision does
982                  * not depend on the current inner header value
983                  */
984                 use_cache = true;
985         }
986 
987         if (use_cache)
988                 dst = ip6_tnl_dst_check(t);
989         if (!dst) {
990                 ndst = ip6_route_output(net, NULL, fl6);
991 
992                 if (ndst->error)
993                         goto tx_err_link_failure;
994                 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
995                 if (IS_ERR(ndst)) {
996                         err = PTR_ERR(ndst);
997                         ndst = NULL;
998                         goto tx_err_link_failure;
999                 }
1000                 dst = ndst;
1001         }
1002 
1003         tdev = dst->dev;
1004 
1005         if (tdev == dev) {
1006                 stats->collisions++;
1007                 net_warn_ratelimited("%s: Local routing loop detected!\n",
1008                                      t->parms.name);
1009                 goto tx_err_dst_release;
1010         }
1011         mtu = dst_mtu(dst) - sizeof (*ipv6h);
1012         if (encap_limit >= 0) {
1013                 max_headroom += 8;
1014                 mtu -= 8;
1015         }
1016         if (mtu < IPV6_MIN_MTU)
1017                 mtu = IPV6_MIN_MTU;
1018         if (skb_dst(skb))
1019                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1020         if (skb->len > mtu) {
1021                 *pmtu = mtu;
1022                 err = -EMSGSIZE;
1023                 goto tx_err_dst_release;
1024         }
1025 
1026         skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1027 
1028         /*
1029          * Okay, now see if we can stuff it in the buffer as-is.
1030          */
1031         max_headroom += LL_RESERVED_SPACE(tdev);
1032 
1033         if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1034             (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1035                 struct sk_buff *new_skb;
1036 
1037                 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1038                         goto tx_err_dst_release;
1039 
1040                 if (skb->sk)
1041                         skb_set_owner_w(new_skb, skb->sk);
1042                 consume_skb(skb);
1043                 skb = new_skb;
1044         }
1045         if (!use_cache) {
1046                 skb_dst_set(skb, dst);
1047                 ndst = NULL;
1048         } else {
1049                 skb_dst_set_noref(skb, dst);
1050         }
1051         skb->transport_header = skb->network_header;
1052 
1053         proto = fl6->flowi6_proto;
1054         if (encap_limit >= 0) {
1055                 init_tel_txopt(&opt, encap_limit);
1056                 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1057         }
1058 
1059         if (likely(!skb->encapsulation)) {
1060                 skb_reset_inner_headers(skb);
1061                 skb->encapsulation = 1;
1062         }
1063 
1064         skb_push(skb, sizeof(struct ipv6hdr));
1065         skb_reset_network_header(skb);
1066         ipv6h = ipv6_hdr(skb);
1067         ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
1068         ipv6h->hop_limit = t->parms.hop_limit;
1069         ipv6h->nexthdr = proto;
1070         ipv6h->saddr = fl6->saddr;
1071         ipv6h->daddr = fl6->daddr;
1072         ip6tunnel_xmit(skb, dev);
1073         if (ndst)
1074                 ip6_tnl_dst_store(t, ndst);
1075         return 0;
1076 tx_err_link_failure:
1077         stats->tx_carrier_errors++;
1078         dst_link_failure(skb);
1079 tx_err_dst_release:
1080         dst_release(ndst);
1081         return err;
1082 }
1083 
1084 static inline int
1085 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1086 {
1087         struct ip6_tnl *t = netdev_priv(dev);
1088         const struct iphdr  *iph;
1089         int encap_limit = -1;
1090         struct flowi6 fl6;
1091         __u8 dsfield;
1092         __u32 mtu;
1093         int err;
1094 
1095         /* ensure we can access the full inner ip header */
1096         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
1097                 return -1;
1098 
1099         iph = ip_hdr(skb);
1100         if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1101             !ip6_tnl_xmit_ctl(t))
1102                 return -1;
1103 
1104         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1105                 encap_limit = t->parms.encap_limit;
1106 
1107         memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1108         fl6.flowi6_proto = IPPROTO_IPIP;
1109 
1110         dsfield = ipv4_get_dsfield(iph);
1111 
1112         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1113                 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1114                                           & IPV6_TCLASS_MASK;
1115         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1116                 fl6.flowi6_mark = skb->mark;
1117 
1118         err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1119         if (err != 0) {
1120                 /* XXX: send ICMP error even if DF is not set. */
1121                 if (err == -EMSGSIZE)
1122                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1123                                   htonl(mtu));
1124                 return -1;
1125         }
1126 
1127         return 0;
1128 }
1129 
1130 static inline int
1131 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1132 {
1133         struct ip6_tnl *t = netdev_priv(dev);
1134         struct ipv6hdr *ipv6h;
1135         int encap_limit = -1;
1136         __u16 offset;
1137         struct flowi6 fl6;
1138         __u8 dsfield;
1139         __u32 mtu;
1140         int err;
1141 
1142         if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
1143                 return -1;
1144 
1145         ipv6h = ipv6_hdr(skb);
1146         if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1147             !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1148                 return -1;
1149 
1150         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1151         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1152         ipv6h = ipv6_hdr(skb);
1153         if (offset > 0) {
1154                 struct ipv6_tlv_tnl_enc_lim *tel;
1155                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1156                 if (tel->encap_limit == 0) {
1157                         icmpv6_send(skb, ICMPV6_PARAMPROB,
1158                                     ICMPV6_HDR_FIELD, offset + 2);
1159                         return -1;
1160                 }
1161                 encap_limit = tel->encap_limit - 1;
1162         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1163                 encap_limit = t->parms.encap_limit;
1164 
1165         memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1166         fl6.flowi6_proto = IPPROTO_IPV6;
1167 
1168         dsfield = ipv6_get_dsfield(ipv6h);
1169         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1170                 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1171         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1172                 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1173         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1174                 fl6.flowi6_mark = skb->mark;
1175 
1176         err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1177         if (err != 0) {
1178                 if (err == -EMSGSIZE)
1179                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1180                 return -1;
1181         }
1182 
1183         return 0;
1184 }
1185 
1186 static netdev_tx_t
1187 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1188 {
1189         struct ip6_tnl *t = netdev_priv(dev);
1190         struct net_device_stats *stats = &t->dev->stats;
1191         int ret;
1192 
1193         switch (skb->protocol) {
1194         case htons(ETH_P_IP):
1195                 ret = ip4ip6_tnl_xmit(skb, dev);
1196                 break;
1197         case htons(ETH_P_IPV6):
1198                 ret = ip6ip6_tnl_xmit(skb, dev);
1199                 break;
1200         default:
1201                 goto tx_err;
1202         }
1203 
1204         if (ret < 0)
1205                 goto tx_err;
1206 
1207         return NETDEV_TX_OK;
1208 
1209 tx_err:
1210         stats->tx_errors++;
1211         stats->tx_dropped++;
1212         kfree_skb(skb);
1213         return NETDEV_TX_OK;
1214 }
1215 
1216 static void ip6_tnl_link_config(struct ip6_tnl *t)
1217 {
1218         struct net_device *dev = t->dev;
1219         struct __ip6_tnl_parm *p = &t->parms;
1220         struct flowi6 *fl6 = &t->fl.u.ip6;
1221 
1222         memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1223         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1224 
1225         /* Set up flowi template */
1226         fl6->saddr = p->laddr;
1227         fl6->daddr = p->raddr;
1228         fl6->flowi6_oif = p->link;
1229         fl6->flowlabel = 0;
1230 
1231         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1232                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1233         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1234                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1235 
1236         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1237         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1238 
1239         if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1240                 dev->flags |= IFF_POINTOPOINT;
1241         else
1242                 dev->flags &= ~IFF_POINTOPOINT;
1243 
1244         dev->iflink = p->link;
1245 
1246         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1247                 int strict = (ipv6_addr_type(&p->raddr) &
1248                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1249 
1250                 struct rt6_info *rt = rt6_lookup(t->net,
1251                                                  &p->raddr, &p->laddr,
1252                                                  p->link, strict);
1253 
1254                 if (rt == NULL)
1255                         return;
1256 
1257                 if (rt->dst.dev) {
1258                         dev->hard_header_len = rt->dst.dev->hard_header_len +
1259                                 sizeof (struct ipv6hdr);
1260 
1261                         dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
1262                         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1263                                 dev->mtu-=8;
1264 
1265                         if (dev->mtu < IPV6_MIN_MTU)
1266                                 dev->mtu = IPV6_MIN_MTU;
1267                 }
1268                 ip6_rt_put(rt);
1269         }
1270 }
1271 
1272 /**
1273  * ip6_tnl_change - update the tunnel parameters
1274  *   @t: tunnel to be changed
1275  *   @p: tunnel configuration parameters
1276  *
1277  * Description:
1278  *   ip6_tnl_change() updates the tunnel parameters
1279  **/
1280 
1281 static int
1282 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1283 {
1284         t->parms.laddr = p->laddr;
1285         t->parms.raddr = p->raddr;
1286         t->parms.flags = p->flags;
1287         t->parms.hop_limit = p->hop_limit;
1288         t->parms.encap_limit = p->encap_limit;
1289         t->parms.flowinfo = p->flowinfo;
1290         t->parms.link = p->link;
1291         t->parms.proto = p->proto;
1292         ip6_tnl_dst_reset(t);
1293         ip6_tnl_link_config(t);
1294         return 0;
1295 }
1296 
1297 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1298 {
1299         struct net *net = t->net;
1300         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1301         int err;
1302 
1303         ip6_tnl_unlink(ip6n, t);
1304         synchronize_net();
1305         err = ip6_tnl_change(t, p);
1306         ip6_tnl_link(ip6n, t);
1307         netdev_state_change(t->dev);
1308         return err;
1309 }
1310 
1311 static void
1312 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1313 {
1314         p->laddr = u->laddr;
1315         p->raddr = u->raddr;
1316         p->flags = u->flags;
1317         p->hop_limit = u->hop_limit;
1318         p->encap_limit = u->encap_limit;
1319         p->flowinfo = u->flowinfo;
1320         p->link = u->link;
1321         p->proto = u->proto;
1322         memcpy(p->name, u->name, sizeof(u->name));
1323 }
1324 
1325 static void
1326 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1327 {
1328         u->laddr = p->laddr;
1329         u->raddr = p->raddr;
1330         u->flags = p->flags;
1331         u->hop_limit = p->hop_limit;
1332         u->encap_limit = p->encap_limit;
1333         u->flowinfo = p->flowinfo;
1334         u->link = p->link;
1335         u->proto = p->proto;
1336         memcpy(u->name, p->name, sizeof(u->name));
1337 }
1338 
1339 /**
1340  * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1341  *   @dev: virtual device associated with tunnel
1342  *   @ifr: parameters passed from userspace
1343  *   @cmd: command to be performed
1344  *
1345  * Description:
1346  *   ip6_tnl_ioctl() is used for managing IPv6 tunnels
1347  *   from userspace.
1348  *
1349  *   The possible commands are the following:
1350  *     %SIOCGETTUNNEL: get tunnel parameters for device
1351  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1352  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
1353  *     %SIOCDELTUNNEL: delete tunnel
1354  *
1355  *   The fallback device "ip6tnl0", created during module
1356  *   initialization, can be used for creating other tunnel devices.
1357  *
1358  * Return:
1359  *   0 on success,
1360  *   %-EFAULT if unable to copy data to or from userspace,
1361  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
1362  *   %-EINVAL if passed tunnel parameters are invalid,
1363  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
1364  *   %-ENODEV if attempting to change or delete a nonexisting device
1365  **/
1366 
1367 static int
1368 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1369 {
1370         int err = 0;
1371         struct ip6_tnl_parm p;
1372         struct __ip6_tnl_parm p1;
1373         struct ip6_tnl *t = netdev_priv(dev);
1374         struct net *net = t->net;
1375         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1376 
1377         switch (cmd) {
1378         case SIOCGETTUNNEL:
1379                 if (dev == ip6n->fb_tnl_dev) {
1380                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1381                                 err = -EFAULT;
1382                                 break;
1383                         }
1384                         ip6_tnl_parm_from_user(&p1, &p);
1385                         t = ip6_tnl_locate(net, &p1, 0);
1386                         if (t == NULL)
1387                                 t = netdev_priv(dev);
1388                 } else {
1389                         memset(&p, 0, sizeof(p));
1390                 }
1391                 ip6_tnl_parm_to_user(&p, &t->parms);
1392                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1393                         err = -EFAULT;
1394                 }
1395                 break;
1396         case SIOCADDTUNNEL:
1397         case SIOCCHGTUNNEL:
1398                 err = -EPERM;
1399                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1400                         break;
1401                 err = -EFAULT;
1402                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1403                         break;
1404                 err = -EINVAL;
1405                 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1406                     p.proto != 0)
1407                         break;
1408                 ip6_tnl_parm_from_user(&p1, &p);
1409                 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1410                 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1411                         if (t != NULL) {
1412                                 if (t->dev != dev) {
1413                                         err = -EEXIST;
1414                                         break;
1415                                 }
1416                         } else
1417                                 t = netdev_priv(dev);
1418 
1419                         err = ip6_tnl_update(t, &p1);
1420                 }
1421                 if (t) {
1422                         err = 0;
1423                         ip6_tnl_parm_to_user(&p, &t->parms);
1424                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1425                                 err = -EFAULT;
1426 
1427                 } else
1428                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1429                 break;
1430         case SIOCDELTUNNEL:
1431                 err = -EPERM;
1432                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1433                         break;
1434 
1435                 if (dev == ip6n->fb_tnl_dev) {
1436                         err = -EFAULT;
1437                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1438                                 break;
1439                         err = -ENOENT;
1440                         ip6_tnl_parm_from_user(&p1, &p);
1441                         t = ip6_tnl_locate(net, &p1, 0);
1442                         if (t == NULL)
1443                                 break;
1444                         err = -EPERM;
1445                         if (t->dev == ip6n->fb_tnl_dev)
1446                                 break;
1447                         dev = t->dev;
1448                 }
1449                 err = 0;
1450                 unregister_netdevice(dev);
1451                 break;
1452         default:
1453                 err = -EINVAL;
1454         }
1455         return err;
1456 }
1457 
1458 /**
1459  * ip6_tnl_change_mtu - change mtu manually for tunnel device
1460  *   @dev: virtual device associated with tunnel
1461  *   @new_mtu: the new mtu
1462  *
1463  * Return:
1464  *   0 on success,
1465  *   %-EINVAL if mtu too small
1466  **/
1467 
1468 static int
1469 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1470 {
1471         struct ip6_tnl *tnl = netdev_priv(dev);
1472 
1473         if (tnl->parms.proto == IPPROTO_IPIP) {
1474                 if (new_mtu < 68)
1475                         return -EINVAL;
1476         } else {
1477                 if (new_mtu < IPV6_MIN_MTU)
1478                         return -EINVAL;
1479         }
1480         if (new_mtu > 0xFFF8 - dev->hard_header_len)
1481                 return -EINVAL;
1482         dev->mtu = new_mtu;
1483         return 0;
1484 }
1485 
1486 
1487 static const struct net_device_ops ip6_tnl_netdev_ops = {
1488         .ndo_init       = ip6_tnl_dev_init,
1489         .ndo_uninit     = ip6_tnl_dev_uninit,
1490         .ndo_start_xmit = ip6_tnl_xmit,
1491         .ndo_do_ioctl   = ip6_tnl_ioctl,
1492         .ndo_change_mtu = ip6_tnl_change_mtu,
1493         .ndo_get_stats  = ip6_get_stats,
1494 };
1495 
1496 
1497 /**
1498  * ip6_tnl_dev_setup - setup virtual tunnel device
1499  *   @dev: virtual device associated with tunnel
1500  *
1501  * Description:
1502  *   Initialize function pointers and device parameters
1503  **/
1504 
1505 static void ip6_tnl_dev_setup(struct net_device *dev)
1506 {
1507         struct ip6_tnl *t;
1508 
1509         dev->netdev_ops = &ip6_tnl_netdev_ops;
1510         dev->destructor = ip6_dev_free;
1511 
1512         dev->type = ARPHRD_TUNNEL6;
1513         dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1514         dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1515         t = netdev_priv(dev);
1516         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1517                 dev->mtu-=8;
1518         dev->flags |= IFF_NOARP;
1519         dev->addr_len = sizeof(struct in6_addr);
1520         dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1521         /* This perm addr will be used as interface identifier by IPv6 */
1522         dev->addr_assign_type = NET_ADDR_RANDOM;
1523         eth_random_addr(dev->perm_addr);
1524 }
1525 
1526 
1527 /**
1528  * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1529  *   @dev: virtual device associated with tunnel
1530  **/
1531 
1532 static inline int
1533 ip6_tnl_dev_init_gen(struct net_device *dev)
1534 {
1535         struct ip6_tnl *t = netdev_priv(dev);
1536 
1537         t->dev = dev;
1538         t->net = dev_net(dev);
1539         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1540         if (!dev->tstats)
1541                 return -ENOMEM;
1542         return 0;
1543 }
1544 
1545 /**
1546  * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1547  *   @dev: virtual device associated with tunnel
1548  **/
1549 
1550 static int ip6_tnl_dev_init(struct net_device *dev)
1551 {
1552         struct ip6_tnl *t = netdev_priv(dev);
1553         int err = ip6_tnl_dev_init_gen(dev);
1554 
1555         if (err)
1556                 return err;
1557         ip6_tnl_link_config(t);
1558         return 0;
1559 }
1560 
1561 /**
1562  * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1563  *   @dev: fallback device
1564  *
1565  * Return: 0
1566  **/
1567 
1568 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1569 {
1570         struct ip6_tnl *t = netdev_priv(dev);
1571         struct net *net = dev_net(dev);
1572         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1573 
1574         t->parms.proto = IPPROTO_IPV6;
1575         dev_hold(dev);
1576 
1577         rcu_assign_pointer(ip6n->tnls_wc[0], t);
1578         return 0;
1579 }
1580 
1581 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1582 {
1583         u8 proto;
1584 
1585         if (!data || !data[IFLA_IPTUN_PROTO])
1586                 return 0;
1587 
1588         proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1589         if (proto != IPPROTO_IPV6 &&
1590             proto != IPPROTO_IPIP &&
1591             proto != 0)
1592                 return -EINVAL;
1593 
1594         return 0;
1595 }
1596 
1597 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1598                                   struct __ip6_tnl_parm *parms)
1599 {
1600         memset(parms, 0, sizeof(*parms));
1601 
1602         if (!data)
1603                 return;
1604 
1605         if (data[IFLA_IPTUN_LINK])
1606                 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1607 
1608         if (data[IFLA_IPTUN_LOCAL])
1609                 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1610                            sizeof(struct in6_addr));
1611 
1612         if (data[IFLA_IPTUN_REMOTE])
1613                 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1614                            sizeof(struct in6_addr));
1615 
1616         if (data[IFLA_IPTUN_TTL])
1617                 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1618 
1619         if (data[IFLA_IPTUN_ENCAP_LIMIT])
1620                 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1621 
1622         if (data[IFLA_IPTUN_FLOWINFO])
1623                 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1624 
1625         if (data[IFLA_IPTUN_FLAGS])
1626                 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1627 
1628         if (data[IFLA_IPTUN_PROTO])
1629                 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1630 }
1631 
1632 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1633                            struct nlattr *tb[], struct nlattr *data[])
1634 {
1635         struct net *net = dev_net(dev);
1636         struct ip6_tnl *nt;
1637 
1638         nt = netdev_priv(dev);
1639         ip6_tnl_netlink_parms(data, &nt->parms);
1640 
1641         if (ip6_tnl_locate(net, &nt->parms, 0))
1642                 return -EEXIST;
1643 
1644         return ip6_tnl_create2(dev);
1645 }
1646 
1647 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1648                               struct nlattr *data[])
1649 {
1650         struct ip6_tnl *t = netdev_priv(dev);
1651         struct __ip6_tnl_parm p;
1652         struct net *net = t->net;
1653         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1654 
1655         if (dev == ip6n->fb_tnl_dev)
1656                 return -EINVAL;
1657 
1658         ip6_tnl_netlink_parms(data, &p);
1659 
1660         t = ip6_tnl_locate(net, &p, 0);
1661 
1662         if (t) {
1663                 if (t->dev != dev)
1664                         return -EEXIST;
1665         } else
1666                 t = netdev_priv(dev);
1667 
1668         return ip6_tnl_update(t, &p);
1669 }
1670 
1671 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1672 {
1673         struct net *net = dev_net(dev);
1674         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1675 
1676         if (dev != ip6n->fb_tnl_dev)
1677                 unregister_netdevice_queue(dev, head);
1678 }
1679 
1680 static size_t ip6_tnl_get_size(const struct net_device *dev)
1681 {
1682         return
1683                 /* IFLA_IPTUN_LINK */
1684                 nla_total_size(4) +
1685                 /* IFLA_IPTUN_LOCAL */
1686                 nla_total_size(sizeof(struct in6_addr)) +
1687                 /* IFLA_IPTUN_REMOTE */
1688                 nla_total_size(sizeof(struct in6_addr)) +
1689                 /* IFLA_IPTUN_TTL */
1690                 nla_total_size(1) +
1691                 /* IFLA_IPTUN_ENCAP_LIMIT */
1692                 nla_total_size(1) +
1693                 /* IFLA_IPTUN_FLOWINFO */
1694                 nla_total_size(4) +
1695                 /* IFLA_IPTUN_FLAGS */
1696                 nla_total_size(4) +
1697                 /* IFLA_IPTUN_PROTO */
1698                 nla_total_size(1) +
1699                 0;
1700 }
1701 
1702 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1703 {
1704         struct ip6_tnl *tunnel = netdev_priv(dev);
1705         struct __ip6_tnl_parm *parm = &tunnel->parms;
1706 
1707         if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1708             nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1709                     &parm->laddr) ||
1710             nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1711                     &parm->raddr) ||
1712             nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1713             nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1714             nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1715             nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1716             nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1717                 goto nla_put_failure;
1718         return 0;
1719 
1720 nla_put_failure:
1721         return -EMSGSIZE;
1722 }
1723 
1724 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1725         [IFLA_IPTUN_LINK]               = { .type = NLA_U32 },
1726         [IFLA_IPTUN_LOCAL]              = { .len = sizeof(struct in6_addr) },
1727         [IFLA_IPTUN_REMOTE]             = { .len = sizeof(struct in6_addr) },
1728         [IFLA_IPTUN_TTL]                = { .type = NLA_U8 },
1729         [IFLA_IPTUN_ENCAP_LIMIT]        = { .type = NLA_U8 },
1730         [IFLA_IPTUN_FLOWINFO]           = { .type = NLA_U32 },
1731         [IFLA_IPTUN_FLAGS]              = { .type = NLA_U32 },
1732         [IFLA_IPTUN_PROTO]              = { .type = NLA_U8 },
1733 };
1734 
1735 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1736         .kind           = "ip6tnl",
1737         .maxtype        = IFLA_IPTUN_MAX,
1738         .policy         = ip6_tnl_policy,
1739         .priv_size      = sizeof(struct ip6_tnl),
1740         .setup          = ip6_tnl_dev_setup,
1741         .validate       = ip6_tnl_validate,
1742         .newlink        = ip6_tnl_newlink,
1743         .changelink     = ip6_tnl_changelink,
1744         .dellink        = ip6_tnl_dellink,
1745         .get_size       = ip6_tnl_get_size,
1746         .fill_info      = ip6_tnl_fill_info,
1747 };
1748 
1749 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1750         .handler        = ip4ip6_rcv,
1751         .err_handler    = ip4ip6_err,
1752         .priority       =       1,
1753 };
1754 
1755 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1756         .handler        = ip6ip6_rcv,
1757         .err_handler    = ip6ip6_err,
1758         .priority       =       1,
1759 };
1760 
1761 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1762 {
1763         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1764         struct net_device *dev, *aux;
1765         int h;
1766         struct ip6_tnl *t;
1767         LIST_HEAD(list);
1768 
1769         for_each_netdev_safe(net, dev, aux)
1770                 if (dev->rtnl_link_ops == &ip6_link_ops)
1771                         unregister_netdevice_queue(dev, &list);
1772 
1773         for (h = 0; h < HASH_SIZE; h++) {
1774                 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1775                 while (t != NULL) {
1776                         /* If dev is in the same netns, it has already
1777                          * been added to the list by the previous loop.
1778                          */
1779                         if (!net_eq(dev_net(t->dev), net))
1780                                 unregister_netdevice_queue(t->dev, &list);
1781                         t = rtnl_dereference(t->next);
1782                 }
1783         }
1784 
1785         unregister_netdevice_many(&list);
1786 }
1787 
1788 static int __net_init ip6_tnl_init_net(struct net *net)
1789 {
1790         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1791         struct ip6_tnl *t = NULL;
1792         int err;
1793 
1794         ip6n->tnls[0] = ip6n->tnls_wc;
1795         ip6n->tnls[1] = ip6n->tnls_r_l;
1796 
1797         err = -ENOMEM;
1798         ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1799                                       ip6_tnl_dev_setup);
1800 
1801         if (!ip6n->fb_tnl_dev)
1802                 goto err_alloc_dev;
1803         dev_net_set(ip6n->fb_tnl_dev, net);
1804         ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1805         /* FB netdevice is special: we have one, and only one per netns.
1806          * Allowing to move it to another netns is clearly unsafe.
1807          */
1808         ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1809 
1810         err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1811         if (err < 0)
1812                 goto err_register;
1813 
1814         err = register_netdev(ip6n->fb_tnl_dev);
1815         if (err < 0)
1816                 goto err_register;
1817 
1818         t = netdev_priv(ip6n->fb_tnl_dev);
1819 
1820         strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1821         return 0;
1822 
1823 err_register:
1824         ip6_dev_free(ip6n->fb_tnl_dev);
1825 err_alloc_dev:
1826         return err;
1827 }
1828 
1829 static void __net_exit ip6_tnl_exit_net(struct net *net)
1830 {
1831         rtnl_lock();
1832         ip6_tnl_destroy_tunnels(net);
1833         rtnl_unlock();
1834 }
1835 
1836 static struct pernet_operations ip6_tnl_net_ops = {
1837         .init = ip6_tnl_init_net,
1838         .exit = ip6_tnl_exit_net,
1839         .id   = &ip6_tnl_net_id,
1840         .size = sizeof(struct ip6_tnl_net),
1841 };
1842 
1843 /**
1844  * ip6_tunnel_init - register protocol and reserve needed resources
1845  *
1846  * Return: 0 on success
1847  **/
1848 
1849 static int __init ip6_tunnel_init(void)
1850 {
1851         int  err;
1852 
1853         err = register_pernet_device(&ip6_tnl_net_ops);
1854         if (err < 0)
1855                 goto out_pernet;
1856 
1857         err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1858         if (err < 0) {
1859                 pr_err("%s: can't register ip4ip6\n", __func__);
1860                 goto out_ip4ip6;
1861         }
1862 
1863         err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1864         if (err < 0) {
1865                 pr_err("%s: can't register ip6ip6\n", __func__);
1866                 goto out_ip6ip6;
1867         }
1868         err = rtnl_link_register(&ip6_link_ops);
1869         if (err < 0)
1870                 goto rtnl_link_failed;
1871 
1872         return 0;
1873 
1874 rtnl_link_failed:
1875         xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1876 out_ip6ip6:
1877         xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1878 out_ip4ip6:
1879         unregister_pernet_device(&ip6_tnl_net_ops);
1880 out_pernet:
1881         return err;
1882 }
1883 
1884 /**
1885  * ip6_tunnel_cleanup - free resources and unregister protocol
1886  **/
1887 
1888 static void __exit ip6_tunnel_cleanup(void)
1889 {
1890         rtnl_link_unregister(&ip6_link_ops);
1891         if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1892                 pr_info("%s: can't deregister ip4ip6\n", __func__);
1893 
1894         if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1895                 pr_info("%s: can't deregister ip6ip6\n", __func__);
1896 
1897         unregister_pernet_device(&ip6_tnl_net_ops);
1898 }
1899 
1900 module_init(ip6_tunnel_init);
1901 module_exit(ip6_tunnel_cleanup);
1902 

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