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tunnel: Clear IPCB(skb)->opt before dst_link_failure called
[deliverable/linux.git] / net / ipv6 / ip6_tunnel.c
1 /*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * 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 static void ip6_tnl_per_cpu_dst_set(struct ip6_tnl_dst *idst,
130 struct dst_entry *dst)
131 {
132 write_seqlock_bh(&idst->lock);
133 dst_release(rcu_dereference_protected(
134 idst->dst,
135 lockdep_is_held(&idst->lock.lock)));
136 if (dst) {
137 dst_hold(dst);
138 idst->cookie = rt6_get_cookie((struct rt6_info *)dst);
139 } else {
140 idst->cookie = 0;
141 }
142 rcu_assign_pointer(idst->dst, dst);
143 write_sequnlock_bh(&idst->lock);
144 }
145
146 struct dst_entry *ip6_tnl_dst_get(struct ip6_tnl *t)
147 {
148 struct ip6_tnl_dst *idst;
149 struct dst_entry *dst;
150 unsigned int seq;
151 u32 cookie;
152
153 idst = raw_cpu_ptr(t->dst_cache);
154
155 rcu_read_lock();
156 do {
157 seq = read_seqbegin(&idst->lock);
158 dst = rcu_dereference(idst->dst);
159 cookie = idst->cookie;
160 } while (read_seqretry(&idst->lock, seq));
161
162 if (dst && !atomic_inc_not_zero(&dst->__refcnt))
163 dst = NULL;
164 rcu_read_unlock();
165
166 if (dst && dst->obsolete && !dst->ops->check(dst, cookie)) {
167 ip6_tnl_per_cpu_dst_set(idst, NULL);
168 dst_release(dst);
169 dst = NULL;
170 }
171 return dst;
172 }
173 EXPORT_SYMBOL_GPL(ip6_tnl_dst_get);
174
175 void ip6_tnl_dst_reset(struct ip6_tnl *t)
176 {
177 int i;
178
179 for_each_possible_cpu(i)
180 ip6_tnl_per_cpu_dst_set(per_cpu_ptr(t->dst_cache, i), NULL);
181 }
182 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
183
184 void ip6_tnl_dst_set(struct ip6_tnl *t, struct dst_entry *dst)
185 {
186 ip6_tnl_per_cpu_dst_set(raw_cpu_ptr(t->dst_cache), dst);
187
188 }
189 EXPORT_SYMBOL_GPL(ip6_tnl_dst_set);
190
191 void ip6_tnl_dst_destroy(struct ip6_tnl *t)
192 {
193 if (!t->dst_cache)
194 return;
195
196 ip6_tnl_dst_reset(t);
197 free_percpu(t->dst_cache);
198 }
199 EXPORT_SYMBOL_GPL(ip6_tnl_dst_destroy);
200
201 int ip6_tnl_dst_init(struct ip6_tnl *t)
202 {
203 int i;
204
205 t->dst_cache = alloc_percpu(struct ip6_tnl_dst);
206 if (!t->dst_cache)
207 return -ENOMEM;
208
209 for_each_possible_cpu(i)
210 seqlock_init(&per_cpu_ptr(t->dst_cache, i)->lock);
211
212 return 0;
213 }
214 EXPORT_SYMBOL_GPL(ip6_tnl_dst_init);
215
216 /**
217 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
218 * @remote: the address of the tunnel exit-point
219 * @local: the address of the tunnel entry-point
220 *
221 * Return:
222 * tunnel matching given end-points if found,
223 * else fallback tunnel if its device is up,
224 * else %NULL
225 **/
226
227 #define for_each_ip6_tunnel_rcu(start) \
228 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
229
230 static struct ip6_tnl *
231 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
232 {
233 unsigned int hash = HASH(remote, local);
234 struct ip6_tnl *t;
235 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
236 struct in6_addr any;
237
238 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
239 if (ipv6_addr_equal(local, &t->parms.laddr) &&
240 ipv6_addr_equal(remote, &t->parms.raddr) &&
241 (t->dev->flags & IFF_UP))
242 return t;
243 }
244
245 memset(&any, 0, sizeof(any));
246 hash = HASH(&any, local);
247 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
248 if (ipv6_addr_equal(local, &t->parms.laddr) &&
249 (t->dev->flags & IFF_UP))
250 return t;
251 }
252
253 hash = HASH(remote, &any);
254 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
255 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
256 (t->dev->flags & IFF_UP))
257 return t;
258 }
259
260 t = rcu_dereference(ip6n->tnls_wc[0]);
261 if (t && (t->dev->flags & IFF_UP))
262 return t;
263
264 return NULL;
265 }
266
267 /**
268 * ip6_tnl_bucket - get head of list matching given tunnel parameters
269 * @p: parameters containing tunnel end-points
270 *
271 * Description:
272 * ip6_tnl_bucket() returns the head of the list matching the
273 * &struct in6_addr entries laddr and raddr in @p.
274 *
275 * Return: head of IPv6 tunnel list
276 **/
277
278 static struct ip6_tnl __rcu **
279 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
280 {
281 const struct in6_addr *remote = &p->raddr;
282 const struct in6_addr *local = &p->laddr;
283 unsigned int h = 0;
284 int prio = 0;
285
286 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
287 prio = 1;
288 h = HASH(remote, local);
289 }
290 return &ip6n->tnls[prio][h];
291 }
292
293 /**
294 * ip6_tnl_link - add tunnel to hash table
295 * @t: tunnel to be added
296 **/
297
298 static void
299 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
300 {
301 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
302
303 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
304 rcu_assign_pointer(*tp, t);
305 }
306
307 /**
308 * ip6_tnl_unlink - remove tunnel from hash table
309 * @t: tunnel to be removed
310 **/
311
312 static void
313 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
314 {
315 struct ip6_tnl __rcu **tp;
316 struct ip6_tnl *iter;
317
318 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
319 (iter = rtnl_dereference(*tp)) != NULL;
320 tp = &iter->next) {
321 if (t == iter) {
322 rcu_assign_pointer(*tp, t->next);
323 break;
324 }
325 }
326 }
327
328 static void ip6_dev_free(struct net_device *dev)
329 {
330 struct ip6_tnl *t = netdev_priv(dev);
331
332 ip6_tnl_dst_destroy(t);
333 free_percpu(dev->tstats);
334 free_netdev(dev);
335 }
336
337 static int ip6_tnl_create2(struct net_device *dev)
338 {
339 struct ip6_tnl *t = netdev_priv(dev);
340 struct net *net = dev_net(dev);
341 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
342 int err;
343
344 t = netdev_priv(dev);
345
346 err = register_netdevice(dev);
347 if (err < 0)
348 goto out;
349
350 strcpy(t->parms.name, dev->name);
351 dev->rtnl_link_ops = &ip6_link_ops;
352
353 dev_hold(dev);
354 ip6_tnl_link(ip6n, t);
355 return 0;
356
357 out:
358 return err;
359 }
360
361 /**
362 * ip6_tnl_create - create a new tunnel
363 * @p: tunnel parameters
364 * @pt: pointer to new tunnel
365 *
366 * Description:
367 * Create tunnel matching given parameters.
368 *
369 * Return:
370 * created tunnel or error pointer
371 **/
372
373 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
374 {
375 struct net_device *dev;
376 struct ip6_tnl *t;
377 char name[IFNAMSIZ];
378 int err = -ENOMEM;
379
380 if (p->name[0])
381 strlcpy(name, p->name, IFNAMSIZ);
382 else
383 sprintf(name, "ip6tnl%%d");
384
385 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
386 ip6_tnl_dev_setup);
387 if (!dev)
388 goto failed;
389
390 dev_net_set(dev, net);
391
392 t = netdev_priv(dev);
393 t->parms = *p;
394 t->net = dev_net(dev);
395 err = ip6_tnl_create2(dev);
396 if (err < 0)
397 goto failed_free;
398
399 return t;
400
401 failed_free:
402 ip6_dev_free(dev);
403 failed:
404 return ERR_PTR(err);
405 }
406
407 /**
408 * ip6_tnl_locate - find or create tunnel matching given parameters
409 * @p: tunnel parameters
410 * @create: != 0 if allowed to create new tunnel if no match found
411 *
412 * Description:
413 * ip6_tnl_locate() first tries to locate an existing tunnel
414 * based on @parms. If this is unsuccessful, but @create is set a new
415 * tunnel device is created and registered for use.
416 *
417 * Return:
418 * matching tunnel or error pointer
419 **/
420
421 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
422 struct __ip6_tnl_parm *p, int create)
423 {
424 const struct in6_addr *remote = &p->raddr;
425 const struct in6_addr *local = &p->laddr;
426 struct ip6_tnl __rcu **tp;
427 struct ip6_tnl *t;
428 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
429
430 for (tp = ip6_tnl_bucket(ip6n, p);
431 (t = rtnl_dereference(*tp)) != NULL;
432 tp = &t->next) {
433 if (ipv6_addr_equal(local, &t->parms.laddr) &&
434 ipv6_addr_equal(remote, &t->parms.raddr)) {
435 if (create)
436 return ERR_PTR(-EEXIST);
437
438 return t;
439 }
440 }
441 if (!create)
442 return ERR_PTR(-ENODEV);
443 return ip6_tnl_create(net, p);
444 }
445
446 /**
447 * ip6_tnl_dev_uninit - tunnel device uninitializer
448 * @dev: the device to be destroyed
449 *
450 * Description:
451 * ip6_tnl_dev_uninit() removes tunnel from its list
452 **/
453
454 static void
455 ip6_tnl_dev_uninit(struct net_device *dev)
456 {
457 struct ip6_tnl *t = netdev_priv(dev);
458 struct net *net = t->net;
459 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
460
461 if (dev == ip6n->fb_tnl_dev)
462 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
463 else
464 ip6_tnl_unlink(ip6n, t);
465 ip6_tnl_dst_reset(t);
466 dev_put(dev);
467 }
468
469 /**
470 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
471 * @skb: received socket buffer
472 *
473 * Return:
474 * 0 if none was found,
475 * else index to encapsulation limit
476 **/
477
478 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
479 {
480 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
481 __u8 nexthdr = ipv6h->nexthdr;
482 __u16 off = sizeof(*ipv6h);
483
484 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
485 __u16 optlen = 0;
486 struct ipv6_opt_hdr *hdr;
487 if (raw + off + sizeof(*hdr) > skb->data &&
488 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
489 break;
490
491 hdr = (struct ipv6_opt_hdr *) (raw + off);
492 if (nexthdr == NEXTHDR_FRAGMENT) {
493 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
494 if (frag_hdr->frag_off)
495 break;
496 optlen = 8;
497 } else if (nexthdr == NEXTHDR_AUTH) {
498 optlen = (hdr->hdrlen + 2) << 2;
499 } else {
500 optlen = ipv6_optlen(hdr);
501 }
502 if (nexthdr == NEXTHDR_DEST) {
503 __u16 i = off + 2;
504 while (1) {
505 struct ipv6_tlv_tnl_enc_lim *tel;
506
507 /* No more room for encapsulation limit */
508 if (i + sizeof (*tel) > off + optlen)
509 break;
510
511 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
512 /* return index of option if found and valid */
513 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
514 tel->length == 1)
515 return i;
516 /* else jump to next option */
517 if (tel->type)
518 i += tel->length + 2;
519 else
520 i++;
521 }
522 }
523 nexthdr = hdr->nexthdr;
524 off += optlen;
525 }
526 return 0;
527 }
528 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
529
530 /**
531 * ip6_tnl_err - tunnel error handler
532 *
533 * Description:
534 * ip6_tnl_err() should handle errors in the tunnel according
535 * to the specifications in RFC 2473.
536 **/
537
538 static int
539 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
540 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
541 {
542 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
543 struct ip6_tnl *t;
544 int rel_msg = 0;
545 u8 rel_type = ICMPV6_DEST_UNREACH;
546 u8 rel_code = ICMPV6_ADDR_UNREACH;
547 u8 tproto;
548 __u32 rel_info = 0;
549 __u16 len;
550 int err = -ENOENT;
551
552 /* If the packet doesn't contain the original IPv6 header we are
553 in trouble since we might need the source address for further
554 processing of the error. */
555
556 rcu_read_lock();
557 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
558 if (!t)
559 goto out;
560
561 tproto = ACCESS_ONCE(t->parms.proto);
562 if (tproto != ipproto && tproto != 0)
563 goto out;
564
565 err = 0;
566
567 switch (*type) {
568 __u32 teli;
569 struct ipv6_tlv_tnl_enc_lim *tel;
570 __u32 mtu;
571 case ICMPV6_DEST_UNREACH:
572 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
573 t->parms.name);
574 rel_msg = 1;
575 break;
576 case ICMPV6_TIME_EXCEED:
577 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
578 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
579 t->parms.name);
580 rel_msg = 1;
581 }
582 break;
583 case ICMPV6_PARAMPROB:
584 teli = 0;
585 if ((*code) == ICMPV6_HDR_FIELD)
586 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
587
588 if (teli && teli == *info - 2) {
589 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
590 if (tel->encap_limit == 0) {
591 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
592 t->parms.name);
593 rel_msg = 1;
594 }
595 } else {
596 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
597 t->parms.name);
598 }
599 break;
600 case ICMPV6_PKT_TOOBIG:
601 mtu = *info - offset;
602 if (mtu < IPV6_MIN_MTU)
603 mtu = IPV6_MIN_MTU;
604 t->dev->mtu = mtu;
605
606 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
607 if (len > mtu) {
608 rel_type = ICMPV6_PKT_TOOBIG;
609 rel_code = 0;
610 rel_info = mtu;
611 rel_msg = 1;
612 }
613 break;
614 }
615
616 *type = rel_type;
617 *code = rel_code;
618 *info = rel_info;
619 *msg = rel_msg;
620
621 out:
622 rcu_read_unlock();
623 return err;
624 }
625
626 static int
627 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
628 u8 type, u8 code, int offset, __be32 info)
629 {
630 int rel_msg = 0;
631 u8 rel_type = type;
632 u8 rel_code = code;
633 __u32 rel_info = ntohl(info);
634 int err;
635 struct sk_buff *skb2;
636 const struct iphdr *eiph;
637 struct rtable *rt;
638 struct flowi4 fl4;
639
640 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
641 &rel_msg, &rel_info, offset);
642 if (err < 0)
643 return err;
644
645 if (rel_msg == 0)
646 return 0;
647
648 switch (rel_type) {
649 case ICMPV6_DEST_UNREACH:
650 if (rel_code != ICMPV6_ADDR_UNREACH)
651 return 0;
652 rel_type = ICMP_DEST_UNREACH;
653 rel_code = ICMP_HOST_UNREACH;
654 break;
655 case ICMPV6_PKT_TOOBIG:
656 if (rel_code != 0)
657 return 0;
658 rel_type = ICMP_DEST_UNREACH;
659 rel_code = ICMP_FRAG_NEEDED;
660 break;
661 case NDISC_REDIRECT:
662 rel_type = ICMP_REDIRECT;
663 rel_code = ICMP_REDIR_HOST;
664 default:
665 return 0;
666 }
667
668 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
669 return 0;
670
671 skb2 = skb_clone(skb, GFP_ATOMIC);
672 if (!skb2)
673 return 0;
674
675 skb_dst_drop(skb2);
676
677 skb_pull(skb2, offset);
678 skb_reset_network_header(skb2);
679 eiph = ip_hdr(skb2);
680
681 /* Try to guess incoming interface */
682 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
683 eiph->saddr, 0,
684 0, 0,
685 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
686 if (IS_ERR(rt))
687 goto out;
688
689 skb2->dev = rt->dst.dev;
690
691 /* route "incoming" packet */
692 if (rt->rt_flags & RTCF_LOCAL) {
693 ip_rt_put(rt);
694 rt = NULL;
695 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
696 eiph->daddr, eiph->saddr,
697 0, 0,
698 IPPROTO_IPIP,
699 RT_TOS(eiph->tos), 0);
700 if (IS_ERR(rt) ||
701 rt->dst.dev->type != ARPHRD_TUNNEL) {
702 if (!IS_ERR(rt))
703 ip_rt_put(rt);
704 goto out;
705 }
706 skb_dst_set(skb2, &rt->dst);
707 } else {
708 ip_rt_put(rt);
709 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
710 skb2->dev) ||
711 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
712 goto out;
713 }
714
715 /* change mtu on this route */
716 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
717 if (rel_info > dst_mtu(skb_dst(skb2)))
718 goto out;
719
720 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
721 }
722 if (rel_type == ICMP_REDIRECT)
723 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
724
725 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
726
727 out:
728 kfree_skb(skb2);
729 return 0;
730 }
731
732 static int
733 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
734 u8 type, u8 code, int offset, __be32 info)
735 {
736 int rel_msg = 0;
737 u8 rel_type = type;
738 u8 rel_code = code;
739 __u32 rel_info = ntohl(info);
740 int err;
741
742 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
743 &rel_msg, &rel_info, offset);
744 if (err < 0)
745 return err;
746
747 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
748 struct rt6_info *rt;
749 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
750
751 if (!skb2)
752 return 0;
753
754 skb_dst_drop(skb2);
755 skb_pull(skb2, offset);
756 skb_reset_network_header(skb2);
757
758 /* Try to guess incoming interface */
759 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
760 NULL, 0, 0);
761
762 if (rt && rt->dst.dev)
763 skb2->dev = rt->dst.dev;
764
765 icmpv6_send(skb2, rel_type, rel_code, rel_info);
766
767 ip6_rt_put(rt);
768
769 kfree_skb(skb2);
770 }
771
772 return 0;
773 }
774
775 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
776 const struct ipv6hdr *ipv6h,
777 struct sk_buff *skb)
778 {
779 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
780
781 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
782 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
783
784 return IP6_ECN_decapsulate(ipv6h, skb);
785 }
786
787 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
788 const struct ipv6hdr *ipv6h,
789 struct sk_buff *skb)
790 {
791 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
792 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
793
794 return IP6_ECN_decapsulate(ipv6h, skb);
795 }
796
797 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
798 const struct in6_addr *laddr,
799 const struct in6_addr *raddr)
800 {
801 struct __ip6_tnl_parm *p = &t->parms;
802 int ltype = ipv6_addr_type(laddr);
803 int rtype = ipv6_addr_type(raddr);
804 __u32 flags = 0;
805
806 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
807 flags = IP6_TNL_F_CAP_PER_PACKET;
808 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
809 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
810 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
811 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
812 if (ltype&IPV6_ADDR_UNICAST)
813 flags |= IP6_TNL_F_CAP_XMIT;
814 if (rtype&IPV6_ADDR_UNICAST)
815 flags |= IP6_TNL_F_CAP_RCV;
816 }
817 return flags;
818 }
819 EXPORT_SYMBOL(ip6_tnl_get_cap);
820
821 /* called with rcu_read_lock() */
822 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
823 const struct in6_addr *laddr,
824 const struct in6_addr *raddr)
825 {
826 struct __ip6_tnl_parm *p = &t->parms;
827 int ret = 0;
828 struct net *net = t->net;
829
830 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
831 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
832 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
833 struct net_device *ldev = NULL;
834
835 if (p->link)
836 ldev = dev_get_by_index_rcu(net, p->link);
837
838 if ((ipv6_addr_is_multicast(laddr) ||
839 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
840 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
841 ret = 1;
842 }
843 return ret;
844 }
845 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
846
847 /**
848 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
849 * @skb: received socket buffer
850 * @protocol: ethernet protocol ID
851 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
852 *
853 * Return: 0
854 **/
855
856 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
857 __u8 ipproto,
858 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
859 const struct ipv6hdr *ipv6h,
860 struct sk_buff *skb))
861 {
862 struct ip6_tnl *t;
863 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
864 u8 tproto;
865 int err;
866
867 rcu_read_lock();
868 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
869 if (t) {
870 struct pcpu_sw_netstats *tstats;
871
872 tproto = ACCESS_ONCE(t->parms.proto);
873 if (tproto != ipproto && tproto != 0) {
874 rcu_read_unlock();
875 goto discard;
876 }
877
878 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
879 rcu_read_unlock();
880 goto discard;
881 }
882
883 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
884 t->dev->stats.rx_dropped++;
885 rcu_read_unlock();
886 goto discard;
887 }
888 skb->mac_header = skb->network_header;
889 skb_reset_network_header(skb);
890 skb->protocol = htons(protocol);
891 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
892
893 __skb_tunnel_rx(skb, t->dev, t->net);
894
895 err = dscp_ecn_decapsulate(t, ipv6h, skb);
896 if (unlikely(err)) {
897 if (log_ecn_error)
898 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
899 &ipv6h->saddr,
900 ipv6_get_dsfield(ipv6h));
901 if (err > 1) {
902 ++t->dev->stats.rx_frame_errors;
903 ++t->dev->stats.rx_errors;
904 rcu_read_unlock();
905 goto discard;
906 }
907 }
908
909 tstats = this_cpu_ptr(t->dev->tstats);
910 u64_stats_update_begin(&tstats->syncp);
911 tstats->rx_packets++;
912 tstats->rx_bytes += skb->len;
913 u64_stats_update_end(&tstats->syncp);
914
915 netif_rx(skb);
916
917 rcu_read_unlock();
918 return 0;
919 }
920 rcu_read_unlock();
921 return 1;
922
923 discard:
924 kfree_skb(skb);
925 return 0;
926 }
927
928 static int ip4ip6_rcv(struct sk_buff *skb)
929 {
930 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
931 ip4ip6_dscp_ecn_decapsulate);
932 }
933
934 static int ip6ip6_rcv(struct sk_buff *skb)
935 {
936 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
937 ip6ip6_dscp_ecn_decapsulate);
938 }
939
940 struct ipv6_tel_txoption {
941 struct ipv6_txoptions ops;
942 __u8 dst_opt[8];
943 };
944
945 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
946 {
947 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
948
949 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
950 opt->dst_opt[3] = 1;
951 opt->dst_opt[4] = encap_limit;
952 opt->dst_opt[5] = IPV6_TLV_PADN;
953 opt->dst_opt[6] = 1;
954
955 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
956 opt->ops.opt_nflen = 8;
957 }
958
959 /**
960 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
961 * @t: the outgoing tunnel device
962 * @hdr: IPv6 header from the incoming packet
963 *
964 * Description:
965 * Avoid trivial tunneling loop by checking that tunnel exit-point
966 * doesn't match source of incoming packet.
967 *
968 * Return:
969 * 1 if conflict,
970 * 0 else
971 **/
972
973 static inline bool
974 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
975 {
976 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
977 }
978
979 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
980 const struct in6_addr *laddr,
981 const struct in6_addr *raddr)
982 {
983 struct __ip6_tnl_parm *p = &t->parms;
984 int ret = 0;
985 struct net *net = t->net;
986
987 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
988 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
989 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
990 struct net_device *ldev = NULL;
991
992 rcu_read_lock();
993 if (p->link)
994 ldev = dev_get_by_index_rcu(net, p->link);
995
996 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
997 pr_warn("%s xmit: Local address not yet configured!\n",
998 p->name);
999 else if (!ipv6_addr_is_multicast(raddr) &&
1000 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
1001 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1002 p->name);
1003 else
1004 ret = 1;
1005 rcu_read_unlock();
1006 }
1007 return ret;
1008 }
1009 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1010
1011 /**
1012 * ip6_tnl_xmit2 - encapsulate packet and send
1013 * @skb: the outgoing socket buffer
1014 * @dev: the outgoing tunnel device
1015 * @dsfield: dscp code for outer header
1016 * @fl: flow of tunneled packet
1017 * @encap_limit: encapsulation limit
1018 * @pmtu: Path MTU is stored if packet is too big
1019 *
1020 * Description:
1021 * Build new header and do some sanity checks on the packet before sending
1022 * it.
1023 *
1024 * Return:
1025 * 0 on success
1026 * -1 fail
1027 * %-EMSGSIZE message too big. return mtu in this case.
1028 **/
1029
1030 static int ip6_tnl_xmit2(struct sk_buff *skb,
1031 struct net_device *dev,
1032 __u8 dsfield,
1033 struct flowi6 *fl6,
1034 int encap_limit,
1035 __u32 *pmtu)
1036 {
1037 struct ip6_tnl *t = netdev_priv(dev);
1038 struct net *net = t->net;
1039 struct net_device_stats *stats = &t->dev->stats;
1040 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1041 struct ipv6_tel_txoption opt;
1042 struct dst_entry *dst = NULL, *ndst = NULL;
1043 struct net_device *tdev;
1044 int mtu;
1045 unsigned int max_headroom = sizeof(struct ipv6hdr);
1046 u8 proto;
1047 int err = -1;
1048
1049 /* NBMA tunnel */
1050 if (ipv6_addr_any(&t->parms.raddr)) {
1051 struct in6_addr *addr6;
1052 struct neighbour *neigh;
1053 int addr_type;
1054
1055 if (!skb_dst(skb))
1056 goto tx_err_link_failure;
1057
1058 neigh = dst_neigh_lookup(skb_dst(skb),
1059 &ipv6_hdr(skb)->daddr);
1060 if (!neigh)
1061 goto tx_err_link_failure;
1062
1063 addr6 = (struct in6_addr *)&neigh->primary_key;
1064 addr_type = ipv6_addr_type(addr6);
1065
1066 if (addr_type == IPV6_ADDR_ANY)
1067 addr6 = &ipv6_hdr(skb)->daddr;
1068
1069 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1070 neigh_release(neigh);
1071 } else if (!fl6->flowi6_mark)
1072 dst = ip6_tnl_dst_get(t);
1073
1074 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1075 goto tx_err_link_failure;
1076
1077 if (!dst) {
1078 dst = ip6_route_output(net, NULL, fl6);
1079
1080 if (dst->error)
1081 goto tx_err_link_failure;
1082 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1083 if (IS_ERR(dst)) {
1084 err = PTR_ERR(dst);
1085 dst = NULL;
1086 goto tx_err_link_failure;
1087 }
1088 ndst = dst;
1089 }
1090
1091 tdev = dst->dev;
1092
1093 if (tdev == dev) {
1094 stats->collisions++;
1095 net_warn_ratelimited("%s: Local routing loop detected!\n",
1096 t->parms.name);
1097 goto tx_err_dst_release;
1098 }
1099 mtu = dst_mtu(dst) - sizeof(*ipv6h);
1100 if (encap_limit >= 0) {
1101 max_headroom += 8;
1102 mtu -= 8;
1103 }
1104 if (mtu < IPV6_MIN_MTU)
1105 mtu = IPV6_MIN_MTU;
1106 if (skb_dst(skb))
1107 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1108 if (skb->len > mtu) {
1109 *pmtu = mtu;
1110 err = -EMSGSIZE;
1111 goto tx_err_dst_release;
1112 }
1113
1114 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1115
1116 /*
1117 * Okay, now see if we can stuff it in the buffer as-is.
1118 */
1119 max_headroom += LL_RESERVED_SPACE(tdev);
1120
1121 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1122 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1123 struct sk_buff *new_skb;
1124
1125 new_skb = skb_realloc_headroom(skb, max_headroom);
1126 if (!new_skb)
1127 goto tx_err_dst_release;
1128
1129 if (skb->sk)
1130 skb_set_owner_w(new_skb, skb->sk);
1131 consume_skb(skb);
1132 skb = new_skb;
1133 }
1134
1135 if (!fl6->flowi6_mark && ndst)
1136 ip6_tnl_dst_set(t, ndst);
1137 skb_dst_set(skb, dst);
1138
1139 skb->transport_header = skb->network_header;
1140
1141 proto = fl6->flowi6_proto;
1142 if (encap_limit >= 0) {
1143 init_tel_txopt(&opt, encap_limit);
1144 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1145 }
1146
1147 if (likely(!skb->encapsulation)) {
1148 skb_reset_inner_headers(skb);
1149 skb->encapsulation = 1;
1150 }
1151
1152 skb_push(skb, sizeof(struct ipv6hdr));
1153 skb_reset_network_header(skb);
1154 ipv6h = ipv6_hdr(skb);
1155 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1156 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1157 ipv6h->hop_limit = t->parms.hop_limit;
1158 ipv6h->nexthdr = proto;
1159 ipv6h->saddr = fl6->saddr;
1160 ipv6h->daddr = fl6->daddr;
1161 ip6tunnel_xmit(NULL, skb, dev);
1162 return 0;
1163 tx_err_link_failure:
1164 stats->tx_carrier_errors++;
1165 dst_link_failure(skb);
1166 tx_err_dst_release:
1167 dst_release(dst);
1168 return err;
1169 }
1170
1171 static inline int
1172 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1173 {
1174 struct ip6_tnl *t = netdev_priv(dev);
1175 const struct iphdr *iph = ip_hdr(skb);
1176 int encap_limit = -1;
1177 struct flowi6 fl6;
1178 __u8 dsfield;
1179 __u32 mtu;
1180 u8 tproto;
1181 int err;
1182
1183 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1184
1185 tproto = ACCESS_ONCE(t->parms.proto);
1186 if (tproto != IPPROTO_IPIP && tproto != 0)
1187 return -1;
1188
1189 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1190 encap_limit = t->parms.encap_limit;
1191
1192 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1193 fl6.flowi6_proto = IPPROTO_IPIP;
1194
1195 dsfield = ipv4_get_dsfield(iph);
1196
1197 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1198 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1199 & IPV6_TCLASS_MASK;
1200 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1201 fl6.flowi6_mark = skb->mark;
1202
1203 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1204 if (err != 0) {
1205 /* XXX: send ICMP error even if DF is not set. */
1206 if (err == -EMSGSIZE)
1207 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1208 htonl(mtu));
1209 return -1;
1210 }
1211
1212 return 0;
1213 }
1214
1215 static inline int
1216 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1217 {
1218 struct ip6_tnl *t = netdev_priv(dev);
1219 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1220 int encap_limit = -1;
1221 __u16 offset;
1222 struct flowi6 fl6;
1223 __u8 dsfield;
1224 __u32 mtu;
1225 u8 tproto;
1226 int err;
1227
1228 tproto = ACCESS_ONCE(t->parms.proto);
1229 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1230 ip6_tnl_addr_conflict(t, ipv6h))
1231 return -1;
1232
1233 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1234 if (offset > 0) {
1235 struct ipv6_tlv_tnl_enc_lim *tel;
1236 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1237 if (tel->encap_limit == 0) {
1238 icmpv6_send(skb, ICMPV6_PARAMPROB,
1239 ICMPV6_HDR_FIELD, offset + 2);
1240 return -1;
1241 }
1242 encap_limit = tel->encap_limit - 1;
1243 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1244 encap_limit = t->parms.encap_limit;
1245
1246 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1247 fl6.flowi6_proto = IPPROTO_IPV6;
1248
1249 dsfield = ipv6_get_dsfield(ipv6h);
1250 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1251 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1252 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1253 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1254 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1255 fl6.flowi6_mark = skb->mark;
1256
1257 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1258 if (err != 0) {
1259 if (err == -EMSGSIZE)
1260 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1261 return -1;
1262 }
1263
1264 return 0;
1265 }
1266
1267 static netdev_tx_t
1268 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1269 {
1270 struct ip6_tnl *t = netdev_priv(dev);
1271 struct net_device_stats *stats = &t->dev->stats;
1272 int ret;
1273
1274 switch (skb->protocol) {
1275 case htons(ETH_P_IP):
1276 ret = ip4ip6_tnl_xmit(skb, dev);
1277 break;
1278 case htons(ETH_P_IPV6):
1279 ret = ip6ip6_tnl_xmit(skb, dev);
1280 break;
1281 default:
1282 goto tx_err;
1283 }
1284
1285 if (ret < 0)
1286 goto tx_err;
1287
1288 return NETDEV_TX_OK;
1289
1290 tx_err:
1291 stats->tx_errors++;
1292 stats->tx_dropped++;
1293 kfree_skb(skb);
1294 return NETDEV_TX_OK;
1295 }
1296
1297 static void ip6_tnl_link_config(struct ip6_tnl *t)
1298 {
1299 struct net_device *dev = t->dev;
1300 struct __ip6_tnl_parm *p = &t->parms;
1301 struct flowi6 *fl6 = &t->fl.u.ip6;
1302
1303 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1304 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1305
1306 /* Set up flowi template */
1307 fl6->saddr = p->laddr;
1308 fl6->daddr = p->raddr;
1309 fl6->flowi6_oif = p->link;
1310 fl6->flowlabel = 0;
1311
1312 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1313 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1314 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1315 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1316
1317 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1318 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1319
1320 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1321 dev->flags |= IFF_POINTOPOINT;
1322 else
1323 dev->flags &= ~IFF_POINTOPOINT;
1324
1325 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1326 int strict = (ipv6_addr_type(&p->raddr) &
1327 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1328
1329 struct rt6_info *rt = rt6_lookup(t->net,
1330 &p->raddr, &p->laddr,
1331 p->link, strict);
1332
1333 if (!rt)
1334 return;
1335
1336 if (rt->dst.dev) {
1337 dev->hard_header_len = rt->dst.dev->hard_header_len +
1338 sizeof(struct ipv6hdr);
1339
1340 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
1341 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1342 dev->mtu -= 8;
1343
1344 if (dev->mtu < IPV6_MIN_MTU)
1345 dev->mtu = IPV6_MIN_MTU;
1346 }
1347 ip6_rt_put(rt);
1348 }
1349 }
1350
1351 /**
1352 * ip6_tnl_change - update the tunnel parameters
1353 * @t: tunnel to be changed
1354 * @p: tunnel configuration parameters
1355 *
1356 * Description:
1357 * ip6_tnl_change() updates the tunnel parameters
1358 **/
1359
1360 static int
1361 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1362 {
1363 t->parms.laddr = p->laddr;
1364 t->parms.raddr = p->raddr;
1365 t->parms.flags = p->flags;
1366 t->parms.hop_limit = p->hop_limit;
1367 t->parms.encap_limit = p->encap_limit;
1368 t->parms.flowinfo = p->flowinfo;
1369 t->parms.link = p->link;
1370 t->parms.proto = p->proto;
1371 ip6_tnl_dst_reset(t);
1372 ip6_tnl_link_config(t);
1373 return 0;
1374 }
1375
1376 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1377 {
1378 struct net *net = t->net;
1379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1380 int err;
1381
1382 ip6_tnl_unlink(ip6n, t);
1383 synchronize_net();
1384 err = ip6_tnl_change(t, p);
1385 ip6_tnl_link(ip6n, t);
1386 netdev_state_change(t->dev);
1387 return err;
1388 }
1389
1390 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1391 {
1392 /* for default tnl0 device allow to change only the proto */
1393 t->parms.proto = p->proto;
1394 netdev_state_change(t->dev);
1395 return 0;
1396 }
1397
1398 static void
1399 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1400 {
1401 p->laddr = u->laddr;
1402 p->raddr = u->raddr;
1403 p->flags = u->flags;
1404 p->hop_limit = u->hop_limit;
1405 p->encap_limit = u->encap_limit;
1406 p->flowinfo = u->flowinfo;
1407 p->link = u->link;
1408 p->proto = u->proto;
1409 memcpy(p->name, u->name, sizeof(u->name));
1410 }
1411
1412 static void
1413 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1414 {
1415 u->laddr = p->laddr;
1416 u->raddr = p->raddr;
1417 u->flags = p->flags;
1418 u->hop_limit = p->hop_limit;
1419 u->encap_limit = p->encap_limit;
1420 u->flowinfo = p->flowinfo;
1421 u->link = p->link;
1422 u->proto = p->proto;
1423 memcpy(u->name, p->name, sizeof(u->name));
1424 }
1425
1426 /**
1427 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1428 * @dev: virtual device associated with tunnel
1429 * @ifr: parameters passed from userspace
1430 * @cmd: command to be performed
1431 *
1432 * Description:
1433 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1434 * from userspace.
1435 *
1436 * The possible commands are the following:
1437 * %SIOCGETTUNNEL: get tunnel parameters for device
1438 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1439 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1440 * %SIOCDELTUNNEL: delete tunnel
1441 *
1442 * The fallback device "ip6tnl0", created during module
1443 * initialization, can be used for creating other tunnel devices.
1444 *
1445 * Return:
1446 * 0 on success,
1447 * %-EFAULT if unable to copy data to or from userspace,
1448 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1449 * %-EINVAL if passed tunnel parameters are invalid,
1450 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1451 * %-ENODEV if attempting to change or delete a nonexisting device
1452 **/
1453
1454 static int
1455 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1456 {
1457 int err = 0;
1458 struct ip6_tnl_parm p;
1459 struct __ip6_tnl_parm p1;
1460 struct ip6_tnl *t = netdev_priv(dev);
1461 struct net *net = t->net;
1462 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1463
1464 switch (cmd) {
1465 case SIOCGETTUNNEL:
1466 if (dev == ip6n->fb_tnl_dev) {
1467 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1468 err = -EFAULT;
1469 break;
1470 }
1471 ip6_tnl_parm_from_user(&p1, &p);
1472 t = ip6_tnl_locate(net, &p1, 0);
1473 if (IS_ERR(t))
1474 t = netdev_priv(dev);
1475 } else {
1476 memset(&p, 0, sizeof(p));
1477 }
1478 ip6_tnl_parm_to_user(&p, &t->parms);
1479 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1480 err = -EFAULT;
1481 }
1482 break;
1483 case SIOCADDTUNNEL:
1484 case SIOCCHGTUNNEL:
1485 err = -EPERM;
1486 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1487 break;
1488 err = -EFAULT;
1489 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1490 break;
1491 err = -EINVAL;
1492 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1493 p.proto != 0)
1494 break;
1495 ip6_tnl_parm_from_user(&p1, &p);
1496 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1497 if (cmd == SIOCCHGTUNNEL) {
1498 if (!IS_ERR(t)) {
1499 if (t->dev != dev) {
1500 err = -EEXIST;
1501 break;
1502 }
1503 } else
1504 t = netdev_priv(dev);
1505 if (dev == ip6n->fb_tnl_dev)
1506 err = ip6_tnl0_update(t, &p1);
1507 else
1508 err = ip6_tnl_update(t, &p1);
1509 }
1510 if (!IS_ERR(t)) {
1511 err = 0;
1512 ip6_tnl_parm_to_user(&p, &t->parms);
1513 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1514 err = -EFAULT;
1515
1516 } else {
1517 err = PTR_ERR(t);
1518 }
1519 break;
1520 case SIOCDELTUNNEL:
1521 err = -EPERM;
1522 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1523 break;
1524
1525 if (dev == ip6n->fb_tnl_dev) {
1526 err = -EFAULT;
1527 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1528 break;
1529 err = -ENOENT;
1530 ip6_tnl_parm_from_user(&p1, &p);
1531 t = ip6_tnl_locate(net, &p1, 0);
1532 if (IS_ERR(t))
1533 break;
1534 err = -EPERM;
1535 if (t->dev == ip6n->fb_tnl_dev)
1536 break;
1537 dev = t->dev;
1538 }
1539 err = 0;
1540 unregister_netdevice(dev);
1541 break;
1542 default:
1543 err = -EINVAL;
1544 }
1545 return err;
1546 }
1547
1548 /**
1549 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1550 * @dev: virtual device associated with tunnel
1551 * @new_mtu: the new mtu
1552 *
1553 * Return:
1554 * 0 on success,
1555 * %-EINVAL if mtu too small
1556 **/
1557
1558 static int
1559 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1560 {
1561 struct ip6_tnl *tnl = netdev_priv(dev);
1562
1563 if (tnl->parms.proto == IPPROTO_IPIP) {
1564 if (new_mtu < 68)
1565 return -EINVAL;
1566 } else {
1567 if (new_mtu < IPV6_MIN_MTU)
1568 return -EINVAL;
1569 }
1570 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1571 return -EINVAL;
1572 dev->mtu = new_mtu;
1573 return 0;
1574 }
1575
1576 int ip6_tnl_get_iflink(const struct net_device *dev)
1577 {
1578 struct ip6_tnl *t = netdev_priv(dev);
1579
1580 return t->parms.link;
1581 }
1582 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1583
1584 static const struct net_device_ops ip6_tnl_netdev_ops = {
1585 .ndo_init = ip6_tnl_dev_init,
1586 .ndo_uninit = ip6_tnl_dev_uninit,
1587 .ndo_start_xmit = ip6_tnl_xmit,
1588 .ndo_do_ioctl = ip6_tnl_ioctl,
1589 .ndo_change_mtu = ip6_tnl_change_mtu,
1590 .ndo_get_stats = ip6_get_stats,
1591 .ndo_get_iflink = ip6_tnl_get_iflink,
1592 };
1593
1594
1595 /**
1596 * ip6_tnl_dev_setup - setup virtual tunnel device
1597 * @dev: virtual device associated with tunnel
1598 *
1599 * Description:
1600 * Initialize function pointers and device parameters
1601 **/
1602
1603 static void ip6_tnl_dev_setup(struct net_device *dev)
1604 {
1605 struct ip6_tnl *t;
1606
1607 dev->netdev_ops = &ip6_tnl_netdev_ops;
1608 dev->destructor = ip6_dev_free;
1609
1610 dev->type = ARPHRD_TUNNEL6;
1611 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1612 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
1613 t = netdev_priv(dev);
1614 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1615 dev->mtu -= 8;
1616 dev->flags |= IFF_NOARP;
1617 dev->addr_len = sizeof(struct in6_addr);
1618 netif_keep_dst(dev);
1619 /* This perm addr will be used as interface identifier by IPv6 */
1620 dev->addr_assign_type = NET_ADDR_RANDOM;
1621 eth_random_addr(dev->perm_addr);
1622 }
1623
1624
1625 /**
1626 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1627 * @dev: virtual device associated with tunnel
1628 **/
1629
1630 static inline int
1631 ip6_tnl_dev_init_gen(struct net_device *dev)
1632 {
1633 struct ip6_tnl *t = netdev_priv(dev);
1634 int ret;
1635
1636 t->dev = dev;
1637 t->net = dev_net(dev);
1638 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1639 if (!dev->tstats)
1640 return -ENOMEM;
1641
1642 ret = ip6_tnl_dst_init(t);
1643 if (ret) {
1644 free_percpu(dev->tstats);
1645 dev->tstats = NULL;
1646 return ret;
1647 }
1648
1649 return 0;
1650 }
1651
1652 /**
1653 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1654 * @dev: virtual device associated with tunnel
1655 **/
1656
1657 static int ip6_tnl_dev_init(struct net_device *dev)
1658 {
1659 struct ip6_tnl *t = netdev_priv(dev);
1660 int err = ip6_tnl_dev_init_gen(dev);
1661
1662 if (err)
1663 return err;
1664 ip6_tnl_link_config(t);
1665 return 0;
1666 }
1667
1668 /**
1669 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1670 * @dev: fallback device
1671 *
1672 * Return: 0
1673 **/
1674
1675 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1676 {
1677 struct ip6_tnl *t = netdev_priv(dev);
1678 struct net *net = dev_net(dev);
1679 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1680
1681 t->parms.proto = IPPROTO_IPV6;
1682 dev_hold(dev);
1683
1684 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1685 return 0;
1686 }
1687
1688 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1689 {
1690 u8 proto;
1691
1692 if (!data || !data[IFLA_IPTUN_PROTO])
1693 return 0;
1694
1695 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1696 if (proto != IPPROTO_IPV6 &&
1697 proto != IPPROTO_IPIP &&
1698 proto != 0)
1699 return -EINVAL;
1700
1701 return 0;
1702 }
1703
1704 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1705 struct __ip6_tnl_parm *parms)
1706 {
1707 memset(parms, 0, sizeof(*parms));
1708
1709 if (!data)
1710 return;
1711
1712 if (data[IFLA_IPTUN_LINK])
1713 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1714
1715 if (data[IFLA_IPTUN_LOCAL])
1716 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1717
1718 if (data[IFLA_IPTUN_REMOTE])
1719 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1720
1721 if (data[IFLA_IPTUN_TTL])
1722 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1723
1724 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1725 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1726
1727 if (data[IFLA_IPTUN_FLOWINFO])
1728 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1729
1730 if (data[IFLA_IPTUN_FLAGS])
1731 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1732
1733 if (data[IFLA_IPTUN_PROTO])
1734 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1735 }
1736
1737 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1738 struct nlattr *tb[], struct nlattr *data[])
1739 {
1740 struct net *net = dev_net(dev);
1741 struct ip6_tnl *nt, *t;
1742
1743 nt = netdev_priv(dev);
1744 ip6_tnl_netlink_parms(data, &nt->parms);
1745
1746 t = ip6_tnl_locate(net, &nt->parms, 0);
1747 if (!IS_ERR(t))
1748 return -EEXIST;
1749
1750 return ip6_tnl_create2(dev);
1751 }
1752
1753 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1754 struct nlattr *data[])
1755 {
1756 struct ip6_tnl *t = netdev_priv(dev);
1757 struct __ip6_tnl_parm p;
1758 struct net *net = t->net;
1759 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1760
1761 if (dev == ip6n->fb_tnl_dev)
1762 return -EINVAL;
1763
1764 ip6_tnl_netlink_parms(data, &p);
1765
1766 t = ip6_tnl_locate(net, &p, 0);
1767 if (!IS_ERR(t)) {
1768 if (t->dev != dev)
1769 return -EEXIST;
1770 } else
1771 t = netdev_priv(dev);
1772
1773 return ip6_tnl_update(t, &p);
1774 }
1775
1776 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1777 {
1778 struct net *net = dev_net(dev);
1779 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1780
1781 if (dev != ip6n->fb_tnl_dev)
1782 unregister_netdevice_queue(dev, head);
1783 }
1784
1785 static size_t ip6_tnl_get_size(const struct net_device *dev)
1786 {
1787 return
1788 /* IFLA_IPTUN_LINK */
1789 nla_total_size(4) +
1790 /* IFLA_IPTUN_LOCAL */
1791 nla_total_size(sizeof(struct in6_addr)) +
1792 /* IFLA_IPTUN_REMOTE */
1793 nla_total_size(sizeof(struct in6_addr)) +
1794 /* IFLA_IPTUN_TTL */
1795 nla_total_size(1) +
1796 /* IFLA_IPTUN_ENCAP_LIMIT */
1797 nla_total_size(1) +
1798 /* IFLA_IPTUN_FLOWINFO */
1799 nla_total_size(4) +
1800 /* IFLA_IPTUN_FLAGS */
1801 nla_total_size(4) +
1802 /* IFLA_IPTUN_PROTO */
1803 nla_total_size(1) +
1804 0;
1805 }
1806
1807 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1808 {
1809 struct ip6_tnl *tunnel = netdev_priv(dev);
1810 struct __ip6_tnl_parm *parm = &tunnel->parms;
1811
1812 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1813 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1814 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
1815 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1816 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1817 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1818 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1819 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1820 goto nla_put_failure;
1821 return 0;
1822
1823 nla_put_failure:
1824 return -EMSGSIZE;
1825 }
1826
1827 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1828 {
1829 struct ip6_tnl *tunnel = netdev_priv(dev);
1830
1831 return tunnel->net;
1832 }
1833 EXPORT_SYMBOL(ip6_tnl_get_link_net);
1834
1835 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1836 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1837 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1838 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1839 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1840 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1841 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1842 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1843 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1844 };
1845
1846 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1847 .kind = "ip6tnl",
1848 .maxtype = IFLA_IPTUN_MAX,
1849 .policy = ip6_tnl_policy,
1850 .priv_size = sizeof(struct ip6_tnl),
1851 .setup = ip6_tnl_dev_setup,
1852 .validate = ip6_tnl_validate,
1853 .newlink = ip6_tnl_newlink,
1854 .changelink = ip6_tnl_changelink,
1855 .dellink = ip6_tnl_dellink,
1856 .get_size = ip6_tnl_get_size,
1857 .fill_info = ip6_tnl_fill_info,
1858 .get_link_net = ip6_tnl_get_link_net,
1859 };
1860
1861 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1862 .handler = ip4ip6_rcv,
1863 .err_handler = ip4ip6_err,
1864 .priority = 1,
1865 };
1866
1867 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1868 .handler = ip6ip6_rcv,
1869 .err_handler = ip6ip6_err,
1870 .priority = 1,
1871 };
1872
1873 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1874 {
1875 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1876 struct net_device *dev, *aux;
1877 int h;
1878 struct ip6_tnl *t;
1879 LIST_HEAD(list);
1880
1881 for_each_netdev_safe(net, dev, aux)
1882 if (dev->rtnl_link_ops == &ip6_link_ops)
1883 unregister_netdevice_queue(dev, &list);
1884
1885 for (h = 0; h < HASH_SIZE; h++) {
1886 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1887 while (t) {
1888 /* If dev is in the same netns, it has already
1889 * been added to the list by the previous loop.
1890 */
1891 if (!net_eq(dev_net(t->dev), net))
1892 unregister_netdevice_queue(t->dev, &list);
1893 t = rtnl_dereference(t->next);
1894 }
1895 }
1896
1897 unregister_netdevice_many(&list);
1898 }
1899
1900 static int __net_init ip6_tnl_init_net(struct net *net)
1901 {
1902 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1903 struct ip6_tnl *t = NULL;
1904 int err;
1905
1906 ip6n->tnls[0] = ip6n->tnls_wc;
1907 ip6n->tnls[1] = ip6n->tnls_r_l;
1908
1909 err = -ENOMEM;
1910 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1911 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1912
1913 if (!ip6n->fb_tnl_dev)
1914 goto err_alloc_dev;
1915 dev_net_set(ip6n->fb_tnl_dev, net);
1916 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1917 /* FB netdevice is special: we have one, and only one per netns.
1918 * Allowing to move it to another netns is clearly unsafe.
1919 */
1920 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1921
1922 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1923 if (err < 0)
1924 goto err_register;
1925
1926 err = register_netdev(ip6n->fb_tnl_dev);
1927 if (err < 0)
1928 goto err_register;
1929
1930 t = netdev_priv(ip6n->fb_tnl_dev);
1931
1932 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1933 return 0;
1934
1935 err_register:
1936 ip6_dev_free(ip6n->fb_tnl_dev);
1937 err_alloc_dev:
1938 return err;
1939 }
1940
1941 static void __net_exit ip6_tnl_exit_net(struct net *net)
1942 {
1943 rtnl_lock();
1944 ip6_tnl_destroy_tunnels(net);
1945 rtnl_unlock();
1946 }
1947
1948 static struct pernet_operations ip6_tnl_net_ops = {
1949 .init = ip6_tnl_init_net,
1950 .exit = ip6_tnl_exit_net,
1951 .id = &ip6_tnl_net_id,
1952 .size = sizeof(struct ip6_tnl_net),
1953 };
1954
1955 /**
1956 * ip6_tunnel_init - register protocol and reserve needed resources
1957 *
1958 * Return: 0 on success
1959 **/
1960
1961 static int __init ip6_tunnel_init(void)
1962 {
1963 int err;
1964
1965 err = register_pernet_device(&ip6_tnl_net_ops);
1966 if (err < 0)
1967 goto out_pernet;
1968
1969 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1970 if (err < 0) {
1971 pr_err("%s: can't register ip4ip6\n", __func__);
1972 goto out_ip4ip6;
1973 }
1974
1975 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1976 if (err < 0) {
1977 pr_err("%s: can't register ip6ip6\n", __func__);
1978 goto out_ip6ip6;
1979 }
1980 err = rtnl_link_register(&ip6_link_ops);
1981 if (err < 0)
1982 goto rtnl_link_failed;
1983
1984 return 0;
1985
1986 rtnl_link_failed:
1987 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1988 out_ip6ip6:
1989 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1990 out_ip4ip6:
1991 unregister_pernet_device(&ip6_tnl_net_ops);
1992 out_pernet:
1993 return err;
1994 }
1995
1996 /**
1997 * ip6_tunnel_cleanup - free resources and unregister protocol
1998 **/
1999
2000 static void __exit ip6_tunnel_cleanup(void)
2001 {
2002 rtnl_link_unregister(&ip6_link_ops);
2003 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2004 pr_info("%s: can't deregister ip4ip6\n", __func__);
2005
2006 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2007 pr_info("%s: can't deregister ip6ip6\n", __func__);
2008
2009 unregister_pernet_device(&ip6_tnl_net_ops);
2010 }
2011
2012 module_init(ip6_tunnel_init);
2013 module_exit(ip6_tunnel_cleanup);
Linux kernel - Deliverables
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