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[mirror_ubuntu-hirsute-kernel.git] / net / ipv6 / ip6_tunnel.c
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CommitLineData
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
61MODULE_AUTHOR("Ville Nuorvala");
62MODULE_DESCRIPTION("IPv6 tunneling device");
63MODULE_LICENSE("GPL");
64MODULE_ALIAS_RTNL_LINK("ip6tnl");
65MODULE_ALIAS_NETDEV("ip6tnl0");
66
67#define HASH_SIZE_SHIFT 5
68#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
69
70static bool log_ecn_error = true;
71module_param(log_ecn_error, bool, 0644);
72MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73
74static 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
81static int ip6_tnl_dev_init(struct net_device *dev);
82static void ip6_tnl_dev_setup(struct net_device *dev);
83static struct rtnl_link_ops ip6_link_ops __read_mostly;
84
85static int ip6_tnl_net_id __read_mostly;
86struct 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
95static 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 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
127 * @remote: the address of the tunnel exit-point
128 * @local: the address of the tunnel entry-point
129 *
130 * Return:
131 * tunnel matching given end-points if found,
132 * else fallback tunnel if its device is up,
133 * else %NULL
134 **/
135
136#define for_each_ip6_tunnel_rcu(start) \
137 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
138
139static struct ip6_tnl *
140ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
141{
142 unsigned int hash = HASH(remote, local);
143 struct ip6_tnl *t;
144 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
145 struct in6_addr any;
146
147 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
148 if (ipv6_addr_equal(local, &t->parms.laddr) &&
149 ipv6_addr_equal(remote, &t->parms.raddr) &&
150 (t->dev->flags & IFF_UP))
151 return t;
152 }
153
154 memset(&any, 0, sizeof(any));
155 hash = HASH(&any, local);
156 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
157 if (ipv6_addr_equal(local, &t->parms.laddr) &&
158 (t->dev->flags & IFF_UP))
159 return t;
160 }
161
162 hash = HASH(remote, &any);
163 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
164 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
165 (t->dev->flags & IFF_UP))
166 return t;
167 }
168
169 t = rcu_dereference(ip6n->tnls_wc[0]);
170 if (t && (t->dev->flags & IFF_UP))
171 return t;
172
173 return NULL;
174}
175
176/**
177 * ip6_tnl_bucket - get head of list matching given tunnel parameters
178 * @p: parameters containing tunnel end-points
179 *
180 * Description:
181 * ip6_tnl_bucket() returns the head of the list matching the
182 * &struct in6_addr entries laddr and raddr in @p.
183 *
184 * Return: head of IPv6 tunnel list
185 **/
186
187static struct ip6_tnl __rcu **
188ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
189{
190 const struct in6_addr *remote = &p->raddr;
191 const struct in6_addr *local = &p->laddr;
192 unsigned int h = 0;
193 int prio = 0;
194
195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
196 prio = 1;
197 h = HASH(remote, local);
198 }
199 return &ip6n->tnls[prio][h];
200}
201
202/**
203 * ip6_tnl_link - add tunnel to hash table
204 * @t: tunnel to be added
205 **/
206
207static void
208ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
209{
210 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
211
212 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
213 rcu_assign_pointer(*tp, t);
214}
215
216/**
217 * ip6_tnl_unlink - remove tunnel from hash table
218 * @t: tunnel to be removed
219 **/
220
221static void
222ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
223{
224 struct ip6_tnl __rcu **tp;
225 struct ip6_tnl *iter;
226
227 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
228 (iter = rtnl_dereference(*tp)) != NULL;
229 tp = &iter->next) {
230 if (t == iter) {
231 rcu_assign_pointer(*tp, t->next);
232 break;
233 }
234 }
235}
236
237static void ip6_dev_free(struct net_device *dev)
238{
239 struct ip6_tnl *t = netdev_priv(dev);
240
241 gro_cells_destroy(&t->gro_cells);
242 dst_cache_destroy(&t->dst_cache);
243 free_percpu(dev->tstats);
244 free_netdev(dev);
245}
246
247static int ip6_tnl_create2(struct net_device *dev)
248{
249 struct ip6_tnl *t = netdev_priv(dev);
250 struct net *net = dev_net(dev);
251 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
252 int err;
253
254 t = netdev_priv(dev);
255
256 dev->rtnl_link_ops = &ip6_link_ops;
257 err = register_netdevice(dev);
258 if (err < 0)
259 goto out;
260
261 strcpy(t->parms.name, dev->name);
262
263 dev_hold(dev);
264 ip6_tnl_link(ip6n, t);
265 return 0;
266
267out:
268 return err;
269}
270
271/**
272 * ip6_tnl_create - create a new tunnel
273 * @p: tunnel parameters
274 * @pt: pointer to new tunnel
275 *
276 * Description:
277 * Create tunnel matching given parameters.
278 *
279 * Return:
280 * created tunnel or error pointer
281 **/
282
283static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
284{
285 struct net_device *dev;
286 struct ip6_tnl *t;
287 char name[IFNAMSIZ];
288 int err = -ENOMEM;
289
290 if (p->name[0])
291 strlcpy(name, p->name, IFNAMSIZ);
292 else
293 sprintf(name, "ip6tnl%%d");
294
295 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
296 ip6_tnl_dev_setup);
297 if (!dev)
298 goto failed;
299
300 dev_net_set(dev, net);
301
302 t = netdev_priv(dev);
303 t->parms = *p;
304 t->net = dev_net(dev);
305 err = ip6_tnl_create2(dev);
306 if (err < 0)
307 goto failed_free;
308
309 return t;
310
311failed_free:
312 ip6_dev_free(dev);
313failed:
314 return ERR_PTR(err);
315}
316
317/**
318 * ip6_tnl_locate - find or create tunnel matching given parameters
319 * @p: tunnel parameters
320 * @create: != 0 if allowed to create new tunnel if no match found
321 *
322 * Description:
323 * ip6_tnl_locate() first tries to locate an existing tunnel
324 * based on @parms. If this is unsuccessful, but @create is set a new
325 * tunnel device is created and registered for use.
326 *
327 * Return:
328 * matching tunnel or error pointer
329 **/
330
331static struct ip6_tnl *ip6_tnl_locate(struct net *net,
332 struct __ip6_tnl_parm *p, int create)
333{
334 const struct in6_addr *remote = &p->raddr;
335 const struct in6_addr *local = &p->laddr;
336 struct ip6_tnl __rcu **tp;
337 struct ip6_tnl *t;
338 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
339
340 for (tp = ip6_tnl_bucket(ip6n, p);
341 (t = rtnl_dereference(*tp)) != NULL;
342 tp = &t->next) {
343 if (ipv6_addr_equal(local, &t->parms.laddr) &&
344 ipv6_addr_equal(remote, &t->parms.raddr)) {
345 if (create)
346 return ERR_PTR(-EEXIST);
347
348 return t;
349 }
350 }
351 if (!create)
352 return ERR_PTR(-ENODEV);
353 return ip6_tnl_create(net, p);
354}
355
356/**
357 * ip6_tnl_dev_uninit - tunnel device uninitializer
358 * @dev: the device to be destroyed
359 *
360 * Description:
361 * ip6_tnl_dev_uninit() removes tunnel from its list
362 **/
363
364static void
365ip6_tnl_dev_uninit(struct net_device *dev)
366{
367 struct ip6_tnl *t = netdev_priv(dev);
368 struct net *net = t->net;
369 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
370
371 if (dev == ip6n->fb_tnl_dev)
372 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
373 else
374 ip6_tnl_unlink(ip6n, t);
375 dst_cache_reset(&t->dst_cache);
376 dev_put(dev);
377}
378
379/**
380 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
381 * @skb: received socket buffer
382 *
383 * Return:
384 * 0 if none was found,
385 * else index to encapsulation limit
386 **/
387
388__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
389{
390 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
391 __u8 nexthdr = ipv6h->nexthdr;
392 __u16 off = sizeof(*ipv6h);
393
394 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
395 __u16 optlen = 0;
396 struct ipv6_opt_hdr *hdr;
397 if (raw + off + sizeof(*hdr) > skb->data &&
398 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
399 break;
400
401 hdr = (struct ipv6_opt_hdr *) (raw + off);
402 if (nexthdr == NEXTHDR_FRAGMENT) {
403 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
404 if (frag_hdr->frag_off)
405 break;
406 optlen = 8;
407 } else if (nexthdr == NEXTHDR_AUTH) {
408 optlen = (hdr->hdrlen + 2) << 2;
409 } else {
410 optlen = ipv6_optlen(hdr);
411 }
412 if (nexthdr == NEXTHDR_DEST) {
413 __u16 i = off + 2;
414 while (1) {
415 struct ipv6_tlv_tnl_enc_lim *tel;
416
417 /* No more room for encapsulation limit */
418 if (i + sizeof (*tel) > off + optlen)
419 break;
420
421 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
422 /* return index of option if found and valid */
423 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
424 tel->length == 1)
425 return i;
426 /* else jump to next option */
427 if (tel->type)
428 i += tel->length + 2;
429 else
430 i++;
431 }
432 }
433 nexthdr = hdr->nexthdr;
434 off += optlen;
435 }
436 return 0;
437}
438EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
439
440/**
441 * ip6_tnl_err - tunnel error handler
442 *
443 * Description:
444 * ip6_tnl_err() should handle errors in the tunnel according
445 * to the specifications in RFC 2473.
446 **/
447
448static int
449ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
450 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
451{
452 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
453 struct ip6_tnl *t;
454 int rel_msg = 0;
455 u8 rel_type = ICMPV6_DEST_UNREACH;
456 u8 rel_code = ICMPV6_ADDR_UNREACH;
457 u8 tproto;
458 __u32 rel_info = 0;
459 __u16 len;
460 int err = -ENOENT;
461
462 /* If the packet doesn't contain the original IPv6 header we are
463 in trouble since we might need the source address for further
464 processing of the error. */
465
466 rcu_read_lock();
467 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
468 if (!t)
469 goto out;
470
471 tproto = ACCESS_ONCE(t->parms.proto);
472 if (tproto != ipproto && tproto != 0)
473 goto out;
474
475 err = 0;
476
477 switch (*type) {
478 __u32 teli;
479 struct ipv6_tlv_tnl_enc_lim *tel;
480 __u32 mtu;
481 case ICMPV6_DEST_UNREACH:
482 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
483 t->parms.name);
484 rel_msg = 1;
485 break;
486 case ICMPV6_TIME_EXCEED:
487 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
488 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
489 t->parms.name);
490 rel_msg = 1;
491 }
492 break;
493 case ICMPV6_PARAMPROB:
494 teli = 0;
495 if ((*code) == ICMPV6_HDR_FIELD)
496 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
497
498 if (teli && teli == *info - 2) {
499 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
500 if (tel->encap_limit == 0) {
501 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
502 t->parms.name);
503 rel_msg = 1;
504 }
505 } else {
506 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
507 t->parms.name);
508 }
509 break;
510 case ICMPV6_PKT_TOOBIG:
511 mtu = *info - offset;
512 if (mtu < IPV6_MIN_MTU)
513 mtu = IPV6_MIN_MTU;
514 t->dev->mtu = mtu;
515
516 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
517 if (len > mtu) {
518 rel_type = ICMPV6_PKT_TOOBIG;
519 rel_code = 0;
520 rel_info = mtu;
521 rel_msg = 1;
522 }
523 break;
524 }
525
526 *type = rel_type;
527 *code = rel_code;
528 *info = rel_info;
529 *msg = rel_msg;
530
531out:
532 rcu_read_unlock();
533 return err;
534}
535
536static int
537ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
538 u8 type, u8 code, int offset, __be32 info)
539{
540 int rel_msg = 0;
541 u8 rel_type = type;
542 u8 rel_code = code;
543 __u32 rel_info = ntohl(info);
544 int err;
545 struct sk_buff *skb2;
546 const struct iphdr *eiph;
547 struct rtable *rt;
548 struct flowi4 fl4;
549
550 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
551 &rel_msg, &rel_info, offset);
552 if (err < 0)
553 return err;
554
555 if (rel_msg == 0)
556 return 0;
557
558 switch (rel_type) {
559 case ICMPV6_DEST_UNREACH:
560 if (rel_code != ICMPV6_ADDR_UNREACH)
561 return 0;
562 rel_type = ICMP_DEST_UNREACH;
563 rel_code = ICMP_HOST_UNREACH;
564 break;
565 case ICMPV6_PKT_TOOBIG:
566 if (rel_code != 0)
567 return 0;
568 rel_type = ICMP_DEST_UNREACH;
569 rel_code = ICMP_FRAG_NEEDED;
570 break;
571 case NDISC_REDIRECT:
572 rel_type = ICMP_REDIRECT;
573 rel_code = ICMP_REDIR_HOST;
574 default:
575 return 0;
576 }
577
578 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
579 return 0;
580
581 skb2 = skb_clone(skb, GFP_ATOMIC);
582 if (!skb2)
583 return 0;
584
585 skb_dst_drop(skb2);
586
587 skb_pull(skb2, offset);
588 skb_reset_network_header(skb2);
589 eiph = ip_hdr(skb2);
590
591 /* Try to guess incoming interface */
592 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
593 eiph->saddr, 0,
594 0, 0,
595 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
596 if (IS_ERR(rt))
597 goto out;
598
599 skb2->dev = rt->dst.dev;
600
601 /* route "incoming" packet */
602 if (rt->rt_flags & RTCF_LOCAL) {
603 ip_rt_put(rt);
604 rt = NULL;
605 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
606 eiph->daddr, eiph->saddr,
607 0, 0,
608 IPPROTO_IPIP,
609 RT_TOS(eiph->tos), 0);
610 if (IS_ERR(rt) ||
611 rt->dst.dev->type != ARPHRD_TUNNEL) {
612 if (!IS_ERR(rt))
613 ip_rt_put(rt);
614 goto out;
615 }
616 skb_dst_set(skb2, &rt->dst);
617 } else {
618 ip_rt_put(rt);
619 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
620 skb2->dev) ||
621 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
622 goto out;
623 }
624
625 /* change mtu on this route */
626 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
627 if (rel_info > dst_mtu(skb_dst(skb2)))
628 goto out;
629
630 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
631 }
632 if (rel_type == ICMP_REDIRECT)
633 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
634
635 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
636
637out:
638 kfree_skb(skb2);
639 return 0;
640}
641
642static int
643ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
644 u8 type, u8 code, int offset, __be32 info)
645{
646 int rel_msg = 0;
647 u8 rel_type = type;
648 u8 rel_code = code;
649 __u32 rel_info = ntohl(info);
650 int err;
651
652 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
653 &rel_msg, &rel_info, offset);
654 if (err < 0)
655 return err;
656
657 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
658 struct rt6_info *rt;
659 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
660
661 if (!skb2)
662 return 0;
663
664 skb_dst_drop(skb2);
665 skb_pull(skb2, offset);
666 skb_reset_network_header(skb2);
667
668 /* Try to guess incoming interface */
669 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
670 NULL, 0, 0);
671
672 if (rt && rt->dst.dev)
673 skb2->dev = rt->dst.dev;
674
675 icmpv6_send(skb2, rel_type, rel_code, rel_info);
676
677 ip6_rt_put(rt);
678
679 kfree_skb(skb2);
680 }
681
682 return 0;
683}
684
685static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
686 const struct ipv6hdr *ipv6h,
687 struct sk_buff *skb)
688{
689 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
690
691 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
692 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
693
694 return IP6_ECN_decapsulate(ipv6h, skb);
695}
696
697static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
698 const struct ipv6hdr *ipv6h,
699 struct sk_buff *skb)
700{
701 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
702 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
703
704 return IP6_ECN_decapsulate(ipv6h, skb);
705}
706
707__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
708 const struct in6_addr *laddr,
709 const struct in6_addr *raddr)
710{
711 struct __ip6_tnl_parm *p = &t->parms;
712 int ltype = ipv6_addr_type(laddr);
713 int rtype = ipv6_addr_type(raddr);
714 __u32 flags = 0;
715
716 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
717 flags = IP6_TNL_F_CAP_PER_PACKET;
718 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
719 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
720 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
721 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
722 if (ltype&IPV6_ADDR_UNICAST)
723 flags |= IP6_TNL_F_CAP_XMIT;
724 if (rtype&IPV6_ADDR_UNICAST)
725 flags |= IP6_TNL_F_CAP_RCV;
726 }
727 return flags;
728}
729EXPORT_SYMBOL(ip6_tnl_get_cap);
730
731/* called with rcu_read_lock() */
732int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
733 const struct in6_addr *laddr,
734 const struct in6_addr *raddr)
735{
736 struct __ip6_tnl_parm *p = &t->parms;
737 int ret = 0;
738 struct net *net = t->net;
739
740 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
741 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
742 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
743 struct net_device *ldev = NULL;
744
745 if (p->link)
746 ldev = dev_get_by_index_rcu(net, p->link);
747
748 if ((ipv6_addr_is_multicast(laddr) ||
749 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
750 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
751 ret = 1;
752 }
753 return ret;
754}
755EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
756
757static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
758 const struct tnl_ptk_info *tpi,
759 struct metadata_dst *tun_dst,
760 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
761 const struct ipv6hdr *ipv6h,
762 struct sk_buff *skb),
763 bool log_ecn_err)
764{
765 struct pcpu_sw_netstats *tstats;
766 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
767 int err;
768
769 if ((!(tpi->flags & TUNNEL_CSUM) &&
770 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
771 ((tpi->flags & TUNNEL_CSUM) &&
772 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
773 tunnel->dev->stats.rx_crc_errors++;
774 tunnel->dev->stats.rx_errors++;
775 goto drop;
776 }
777
778 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
779 if (!(tpi->flags & TUNNEL_SEQ) ||
780 (tunnel->i_seqno &&
781 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
782 tunnel->dev->stats.rx_fifo_errors++;
783 tunnel->dev->stats.rx_errors++;
784 goto drop;
785 }
786 tunnel->i_seqno = ntohl(tpi->seq) + 1;
787 }
788
789 skb->protocol = tpi->proto;
790
791 /* Warning: All skb pointers will be invalidated! */
792 if (tunnel->dev->type == ARPHRD_ETHER) {
793 if (!pskb_may_pull(skb, ETH_HLEN)) {
794 tunnel->dev->stats.rx_length_errors++;
795 tunnel->dev->stats.rx_errors++;
796 goto drop;
797 }
798
799 ipv6h = ipv6_hdr(skb);
800 skb->protocol = eth_type_trans(skb, tunnel->dev);
801 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
802 } else {
803 skb->dev = tunnel->dev;
804 }
805
806 skb_reset_network_header(skb);
807 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
808
809 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
810
811 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
812 if (unlikely(err)) {
813 if (log_ecn_err)
814 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
815 &ipv6h->saddr,
816 ipv6_get_dsfield(ipv6h));
817 if (err > 1) {
818 ++tunnel->dev->stats.rx_frame_errors;
819 ++tunnel->dev->stats.rx_errors;
820 goto drop;
821 }
822 }
823
824 tstats = this_cpu_ptr(tunnel->dev->tstats);
825 u64_stats_update_begin(&tstats->syncp);
826 tstats->rx_packets++;
827 tstats->rx_bytes += skb->len;
828 u64_stats_update_end(&tstats->syncp);
829
830 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
831
832 gro_cells_receive(&tunnel->gro_cells, skb);
833 return 0;
834
835drop:
836 kfree_skb(skb);
837 return 0;
838}
839
840int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
841 const struct tnl_ptk_info *tpi,
842 struct metadata_dst *tun_dst,
843 bool log_ecn_err)
844{
845 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
846 log_ecn_err);
847}
848EXPORT_SYMBOL(ip6_tnl_rcv);
849
850static const struct tnl_ptk_info tpi_v6 = {
851 /* no tunnel info required for ipxip6. */
852 .proto = htons(ETH_P_IPV6),
853};
854
855static const struct tnl_ptk_info tpi_v4 = {
856 /* no tunnel info required for ipxip6. */
857 .proto = htons(ETH_P_IP),
858};
859
860static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
861 const struct tnl_ptk_info *tpi,
862 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
863 const struct ipv6hdr *ipv6h,
864 struct sk_buff *skb))
865{
866 struct ip6_tnl *t;
867 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
868 int ret = -1;
869
870 rcu_read_lock();
871 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
872
873 if (t) {
874 u8 tproto = ACCESS_ONCE(t->parms.proto);
875
876 if (tproto != ipproto && tproto != 0)
877 goto drop;
878 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
879 goto drop;
880 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
881 goto drop;
882 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
883 goto drop;
884 ret = __ip6_tnl_rcv(t, skb, tpi, NULL, dscp_ecn_decapsulate,
885 log_ecn_error);
886 }
887
888 rcu_read_unlock();
889
890 return ret;
891
892drop:
893 rcu_read_unlock();
894 kfree_skb(skb);
895 return 0;
896}
897
898static int ip4ip6_rcv(struct sk_buff *skb)
899{
900 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
901 ip4ip6_dscp_ecn_decapsulate);
902}
903
904static int ip6ip6_rcv(struct sk_buff *skb)
905{
906 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
907 ip6ip6_dscp_ecn_decapsulate);
908}
909
910struct ipv6_tel_txoption {
911 struct ipv6_txoptions ops;
912 __u8 dst_opt[8];
913};
914
915static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
916{
917 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
918
919 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
920 opt->dst_opt[3] = 1;
921 opt->dst_opt[4] = encap_limit;
922 opt->dst_opt[5] = IPV6_TLV_PADN;
923 opt->dst_opt[6] = 1;
924
925 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
926 opt->ops.opt_nflen = 8;
927}
928
929/**
930 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
931 * @t: the outgoing tunnel device
932 * @hdr: IPv6 header from the incoming packet
933 *
934 * Description:
935 * Avoid trivial tunneling loop by checking that tunnel exit-point
936 * doesn't match source of incoming packet.
937 *
938 * Return:
939 * 1 if conflict,
940 * 0 else
941 **/
942
943static inline bool
944ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
945{
946 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
947}
948
949int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
950 const struct in6_addr *laddr,
951 const struct in6_addr *raddr)
952{
953 struct __ip6_tnl_parm *p = &t->parms;
954 int ret = 0;
955 struct net *net = t->net;
956
957 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
958 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
959 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
960 struct net_device *ldev = NULL;
961
962 rcu_read_lock();
963 if (p->link)
964 ldev = dev_get_by_index_rcu(net, p->link);
965
966 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
967 pr_warn("%s xmit: Local address not yet configured!\n",
968 p->name);
969 else if (!ipv6_addr_is_multicast(raddr) &&
970 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
971 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
972 p->name);
973 else
974 ret = 1;
975 rcu_read_unlock();
976 }
977 return ret;
978}
979EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
980
981/**
982 * ip6_tnl_xmit - encapsulate packet and send
983 * @skb: the outgoing socket buffer
984 * @dev: the outgoing tunnel device
985 * @dsfield: dscp code for outer header
986 * @fl6: flow of tunneled packet
987 * @encap_limit: encapsulation limit
988 * @pmtu: Path MTU is stored if packet is too big
989 * @proto: next header value
990 *
991 * Description:
992 * Build new header and do some sanity checks on the packet before sending
993 * it.
994 *
995 * Return:
996 * 0 on success
997 * -1 fail
998 * %-EMSGSIZE message too big. return mtu in this case.
999 **/
1000
1001int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1002 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1003 __u8 proto)
1004{
1005 struct ip6_tnl *t = netdev_priv(dev);
1006 struct net *net = t->net;
1007 struct net_device_stats *stats = &t->dev->stats;
1008 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1009 struct ipv6_tel_txoption opt;
1010 struct dst_entry *dst = NULL, *ndst = NULL;
1011 struct net_device *tdev;
1012 int mtu;
1013 unsigned int max_headroom = sizeof(struct ipv6hdr);
1014 int err = -1;
1015
1016 /* NBMA tunnel */
1017 if (ipv6_addr_any(&t->parms.raddr)) {
1018 struct in6_addr *addr6;
1019 struct neighbour *neigh;
1020 int addr_type;
1021
1022 if (!skb_dst(skb))
1023 goto tx_err_link_failure;
1024
1025 neigh = dst_neigh_lookup(skb_dst(skb),
1026 &ipv6_hdr(skb)->daddr);
1027 if (!neigh)
1028 goto tx_err_link_failure;
1029
1030 addr6 = (struct in6_addr *)&neigh->primary_key;
1031 addr_type = ipv6_addr_type(addr6);
1032
1033 if (addr_type == IPV6_ADDR_ANY)
1034 addr6 = &ipv6_hdr(skb)->daddr;
1035
1036 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1037 neigh_release(neigh);
1038 } else if (!fl6->flowi6_mark)
1039 dst = dst_cache_get(&t->dst_cache);
1040
1041 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1042 goto tx_err_link_failure;
1043
1044 if (!dst) {
1045 dst = ip6_route_output(net, NULL, fl6);
1046
1047 if (dst->error)
1048 goto tx_err_link_failure;
1049 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1050 if (IS_ERR(dst)) {
1051 err = PTR_ERR(dst);
1052 dst = NULL;
1053 goto tx_err_link_failure;
1054 }
1055 ndst = dst;
1056 }
1057
1058 tdev = dst->dev;
1059
1060 if (tdev == dev) {
1061 stats->collisions++;
1062 net_warn_ratelimited("%s: Local routing loop detected!\n",
1063 t->parms.name);
1064 goto tx_err_dst_release;
1065 }
1066 mtu = dst_mtu(dst) - sizeof(*ipv6h);
1067 if (encap_limit >= 0) {
1068 max_headroom += 8;
1069 mtu -= 8;
1070 }
1071 if (mtu < IPV6_MIN_MTU)
1072 mtu = IPV6_MIN_MTU;
1073 if (skb_dst(skb))
1074 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1075 if (skb->len > mtu && !skb_is_gso(skb)) {
1076 *pmtu = mtu;
1077 err = -EMSGSIZE;
1078 goto tx_err_dst_release;
1079 }
1080
1081 if (t->err_count > 0) {
1082 if (time_before(jiffies,
1083 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1084 t->err_count--;
1085
1086 dst_link_failure(skb);
1087 } else {
1088 t->err_count = 0;
1089 }
1090 }
1091
1092 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1093
1094 /*
1095 * Okay, now see if we can stuff it in the buffer as-is.
1096 */
1097 max_headroom += LL_RESERVED_SPACE(tdev);
1098
1099 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1100 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1101 struct sk_buff *new_skb;
1102
1103 new_skb = skb_realloc_headroom(skb, max_headroom);
1104 if (!new_skb)
1105 goto tx_err_dst_release;
1106
1107 if (skb->sk)
1108 skb_set_owner_w(new_skb, skb->sk);
1109 consume_skb(skb);
1110 skb = new_skb;
1111 }
1112
1113 if (!fl6->flowi6_mark && ndst)
1114 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1115 skb_dst_set(skb, dst);
1116
1117 if (encap_limit >= 0) {
1118 init_tel_txopt(&opt, encap_limit);
1119 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1120 }
1121
1122 if (likely(!skb->encapsulation)) {
1123 skb_reset_inner_headers(skb);
1124 skb->encapsulation = 1;
1125 }
1126
1127 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1128 + dst->header_len;
1129 if (max_headroom > dev->needed_headroom)
1130 dev->needed_headroom = max_headroom;
1131
1132 skb_push(skb, sizeof(struct ipv6hdr));
1133 skb_reset_network_header(skb);
1134 ipv6h = ipv6_hdr(skb);
1135 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1136 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1137 ipv6h->hop_limit = t->parms.hop_limit;
1138 ipv6h->nexthdr = proto;
1139 ipv6h->saddr = fl6->saddr;
1140 ipv6h->daddr = fl6->daddr;
1141 ip6tunnel_xmit(NULL, skb, dev);
1142 return 0;
1143tx_err_link_failure:
1144 stats->tx_carrier_errors++;
1145 dst_link_failure(skb);
1146tx_err_dst_release:
1147 dst_release(dst);
1148 return err;
1149}
1150EXPORT_SYMBOL(ip6_tnl_xmit);
1151
1152static inline int
1153ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1154{
1155 struct ip6_tnl *t = netdev_priv(dev);
1156 const struct iphdr *iph = ip_hdr(skb);
1157 int encap_limit = -1;
1158 struct flowi6 fl6;
1159 __u8 dsfield;
1160 __u32 mtu;
1161 u8 tproto;
1162 int err;
1163
1164 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1165
1166 tproto = ACCESS_ONCE(t->parms.proto);
1167 if (tproto != IPPROTO_IPIP && tproto != 0)
1168 return -1;
1169
1170 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1171 encap_limit = t->parms.encap_limit;
1172
1173 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1174
1175 dsfield = ipv4_get_dsfield(iph);
1176
1177 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1178 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1179 & IPV6_TCLASS_MASK;
1180 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1181 fl6.flowi6_mark = skb->mark;
1182
1183 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1184 IPPROTO_IPIP);
1185 if (err != 0) {
1186 /* XXX: send ICMP error even if DF is not set. */
1187 if (err == -EMSGSIZE)
1188 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1189 htonl(mtu));
1190 return -1;
1191 }
1192
1193 return 0;
1194}
1195
1196static inline int
1197ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1198{
1199 struct ip6_tnl *t = netdev_priv(dev);
1200 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1201 int encap_limit = -1;
1202 __u16 offset;
1203 struct flowi6 fl6;
1204 __u8 dsfield;
1205 __u32 mtu;
1206 u8 tproto;
1207 int err;
1208
1209 tproto = ACCESS_ONCE(t->parms.proto);
1210 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1211 ip6_tnl_addr_conflict(t, ipv6h))
1212 return -1;
1213
1214 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1215 if (offset > 0) {
1216 struct ipv6_tlv_tnl_enc_lim *tel;
1217 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1218 if (tel->encap_limit == 0) {
1219 icmpv6_send(skb, ICMPV6_PARAMPROB,
1220 ICMPV6_HDR_FIELD, offset + 2);
1221 return -1;
1222 }
1223 encap_limit = tel->encap_limit - 1;
1224 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1225 encap_limit = t->parms.encap_limit;
1226
1227 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1228
1229 dsfield = ipv6_get_dsfield(ipv6h);
1230 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1231 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1232 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1233 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1234 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1235 fl6.flowi6_mark = skb->mark;
1236
1237 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1238 IPPROTO_IPV6);
1239 if (err != 0) {
1240 if (err == -EMSGSIZE)
1241 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1242 return -1;
1243 }
1244
1245 return 0;
1246}
1247
1248static netdev_tx_t
1249ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1250{
1251 struct ip6_tnl *t = netdev_priv(dev);
1252 struct net_device_stats *stats = &t->dev->stats;
1253 int ret;
1254
1255 switch (skb->protocol) {
1256 case htons(ETH_P_IP):
1257 ret = ip4ip6_tnl_xmit(skb, dev);
1258 break;
1259 case htons(ETH_P_IPV6):
1260 ret = ip6ip6_tnl_xmit(skb, dev);
1261 break;
1262 default:
1263 goto tx_err;
1264 }
1265
1266 if (ret < 0)
1267 goto tx_err;
1268
1269 return NETDEV_TX_OK;
1270
1271tx_err:
1272 stats->tx_errors++;
1273 stats->tx_dropped++;
1274 kfree_skb(skb);
1275 return NETDEV_TX_OK;
1276}
1277
1278static void ip6_tnl_link_config(struct ip6_tnl *t)
1279{
1280 struct net_device *dev = t->dev;
1281 struct __ip6_tnl_parm *p = &t->parms;
1282 struct flowi6 *fl6 = &t->fl.u.ip6;
1283
1284 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1285 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1286
1287 /* Set up flowi template */
1288 fl6->saddr = p->laddr;
1289 fl6->daddr = p->raddr;
1290 fl6->flowi6_oif = p->link;
1291 fl6->flowlabel = 0;
1292
1293 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1294 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1295 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1296 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1297
1298 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1299 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1300
1301 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1302 dev->flags |= IFF_POINTOPOINT;
1303 else
1304 dev->flags &= ~IFF_POINTOPOINT;
1305
1306 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1307 int strict = (ipv6_addr_type(&p->raddr) &
1308 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1309
1310 struct rt6_info *rt = rt6_lookup(t->net,
1311 &p->raddr, &p->laddr,
1312 p->link, strict);
1313
1314 if (!rt)
1315 return;
1316
1317 if (rt->dst.dev) {
1318 dev->hard_header_len = rt->dst.dev->hard_header_len +
1319 sizeof(struct ipv6hdr);
1320
1321 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr);
1322 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1323 dev->mtu -= 8;
1324
1325 if (dev->mtu < IPV6_MIN_MTU)
1326 dev->mtu = IPV6_MIN_MTU;
1327 }
1328 ip6_rt_put(rt);
1329 }
1330}
1331
1332/**
1333 * ip6_tnl_change - update the tunnel parameters
1334 * @t: tunnel to be changed
1335 * @p: tunnel configuration parameters
1336 *
1337 * Description:
1338 * ip6_tnl_change() updates the tunnel parameters
1339 **/
1340
1341static int
1342ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1343{
1344 t->parms.laddr = p->laddr;
1345 t->parms.raddr = p->raddr;
1346 t->parms.flags = p->flags;
1347 t->parms.hop_limit = p->hop_limit;
1348 t->parms.encap_limit = p->encap_limit;
1349 t->parms.flowinfo = p->flowinfo;
1350 t->parms.link = p->link;
1351 t->parms.proto = p->proto;
1352 dst_cache_reset(&t->dst_cache);
1353 ip6_tnl_link_config(t);
1354 return 0;
1355}
1356
1357static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1358{
1359 struct net *net = t->net;
1360 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1361 int err;
1362
1363 ip6_tnl_unlink(ip6n, t);
1364 synchronize_net();
1365 err = ip6_tnl_change(t, p);
1366 ip6_tnl_link(ip6n, t);
1367 netdev_state_change(t->dev);
1368 return err;
1369}
1370
1371static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1372{
1373 /* for default tnl0 device allow to change only the proto */
1374 t->parms.proto = p->proto;
1375 netdev_state_change(t->dev);
1376 return 0;
1377}
1378
1379static void
1380ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1381{
1382 p->laddr = u->laddr;
1383 p->raddr = u->raddr;
1384 p->flags = u->flags;
1385 p->hop_limit = u->hop_limit;
1386 p->encap_limit = u->encap_limit;
1387 p->flowinfo = u->flowinfo;
1388 p->link = u->link;
1389 p->proto = u->proto;
1390 memcpy(p->name, u->name, sizeof(u->name));
1391}
1392
1393static void
1394ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1395{
1396 u->laddr = p->laddr;
1397 u->raddr = p->raddr;
1398 u->flags = p->flags;
1399 u->hop_limit = p->hop_limit;
1400 u->encap_limit = p->encap_limit;
1401 u->flowinfo = p->flowinfo;
1402 u->link = p->link;
1403 u->proto = p->proto;
1404 memcpy(u->name, p->name, sizeof(u->name));
1405}
1406
1407/**
1408 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1409 * @dev: virtual device associated with tunnel
1410 * @ifr: parameters passed from userspace
1411 * @cmd: command to be performed
1412 *
1413 * Description:
1414 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1415 * from userspace.
1416 *
1417 * The possible commands are the following:
1418 * %SIOCGETTUNNEL: get tunnel parameters for device
1419 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1420 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1421 * %SIOCDELTUNNEL: delete tunnel
1422 *
1423 * The fallback device "ip6tnl0", created during module
1424 * initialization, can be used for creating other tunnel devices.
1425 *
1426 * Return:
1427 * 0 on success,
1428 * %-EFAULT if unable to copy data to or from userspace,
1429 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1430 * %-EINVAL if passed tunnel parameters are invalid,
1431 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1432 * %-ENODEV if attempting to change or delete a nonexisting device
1433 **/
1434
1435static int
1436ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1437{
1438 int err = 0;
1439 struct ip6_tnl_parm p;
1440 struct __ip6_tnl_parm p1;
1441 struct ip6_tnl *t = netdev_priv(dev);
1442 struct net *net = t->net;
1443 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1444
1445 memset(&p1, 0, sizeof(p1));
1446
1447 switch (cmd) {
1448 case SIOCGETTUNNEL:
1449 if (dev == ip6n->fb_tnl_dev) {
1450 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1451 err = -EFAULT;
1452 break;
1453 }
1454 ip6_tnl_parm_from_user(&p1, &p);
1455 t = ip6_tnl_locate(net, &p1, 0);
1456 if (IS_ERR(t))
1457 t = netdev_priv(dev);
1458 } else {
1459 memset(&p, 0, sizeof(p));
1460 }
1461 ip6_tnl_parm_to_user(&p, &t->parms);
1462 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1463 err = -EFAULT;
1464 }
1465 break;
1466 case SIOCADDTUNNEL:
1467 case SIOCCHGTUNNEL:
1468 err = -EPERM;
1469 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1470 break;
1471 err = -EFAULT;
1472 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1473 break;
1474 err = -EINVAL;
1475 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1476 p.proto != 0)
1477 break;
1478 ip6_tnl_parm_from_user(&p1, &p);
1479 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1480 if (cmd == SIOCCHGTUNNEL) {
1481 if (!IS_ERR(t)) {
1482 if (t->dev != dev) {
1483 err = -EEXIST;
1484 break;
1485 }
1486 } else
1487 t = netdev_priv(dev);
1488 if (dev == ip6n->fb_tnl_dev)
1489 err = ip6_tnl0_update(t, &p1);
1490 else
1491 err = ip6_tnl_update(t, &p1);
1492 }
1493 if (!IS_ERR(t)) {
1494 err = 0;
1495 ip6_tnl_parm_to_user(&p, &t->parms);
1496 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1497 err = -EFAULT;
1498
1499 } else {
1500 err = PTR_ERR(t);
1501 }
1502 break;
1503 case SIOCDELTUNNEL:
1504 err = -EPERM;
1505 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1506 break;
1507
1508 if (dev == ip6n->fb_tnl_dev) {
1509 err = -EFAULT;
1510 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1511 break;
1512 err = -ENOENT;
1513 ip6_tnl_parm_from_user(&p1, &p);
1514 t = ip6_tnl_locate(net, &p1, 0);
1515 if (IS_ERR(t))
1516 break;
1517 err = -EPERM;
1518 if (t->dev == ip6n->fb_tnl_dev)
1519 break;
1520 dev = t->dev;
1521 }
1522 err = 0;
1523 unregister_netdevice(dev);
1524 break;
1525 default:
1526 err = -EINVAL;
1527 }
1528 return err;
1529}
1530
1531/**
1532 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1533 * @dev: virtual device associated with tunnel
1534 * @new_mtu: the new mtu
1535 *
1536 * Return:
1537 * 0 on success,
1538 * %-EINVAL if mtu too small
1539 **/
1540
1541int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1542{
1543 struct ip6_tnl *tnl = netdev_priv(dev);
1544
1545 if (tnl->parms.proto == IPPROTO_IPIP) {
1546 if (new_mtu < 68)
1547 return -EINVAL;
1548 } else {
1549 if (new_mtu < IPV6_MIN_MTU)
1550 return -EINVAL;
1551 }
1552 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1553 return -EINVAL;
1554 dev->mtu = new_mtu;
1555 return 0;
1556}
1557EXPORT_SYMBOL(ip6_tnl_change_mtu);
1558
1559int ip6_tnl_get_iflink(const struct net_device *dev)
1560{
1561 struct ip6_tnl *t = netdev_priv(dev);
1562
1563 return t->parms.link;
1564}
1565EXPORT_SYMBOL(ip6_tnl_get_iflink);
1566
1567static const struct net_device_ops ip6_tnl_netdev_ops = {
1568 .ndo_init = ip6_tnl_dev_init,
1569 .ndo_uninit = ip6_tnl_dev_uninit,
1570 .ndo_start_xmit = ip6_tnl_start_xmit,
1571 .ndo_do_ioctl = ip6_tnl_ioctl,
1572 .ndo_change_mtu = ip6_tnl_change_mtu,
1573 .ndo_get_stats = ip6_get_stats,
1574 .ndo_get_iflink = ip6_tnl_get_iflink,
1575};
1576
1577
1578/**
1579 * ip6_tnl_dev_setup - setup virtual tunnel device
1580 * @dev: virtual device associated with tunnel
1581 *
1582 * Description:
1583 * Initialize function pointers and device parameters
1584 **/
1585
1586static void ip6_tnl_dev_setup(struct net_device *dev)
1587{
1588 struct ip6_tnl *t;
1589
1590 dev->netdev_ops = &ip6_tnl_netdev_ops;
1591 dev->destructor = ip6_dev_free;
1592
1593 dev->type = ARPHRD_TUNNEL6;
1594 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
1595 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr);
1596 t = netdev_priv(dev);
1597 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1598 dev->mtu -= 8;
1599 dev->flags |= IFF_NOARP;
1600 dev->addr_len = sizeof(struct in6_addr);
1601 netif_keep_dst(dev);
1602 /* This perm addr will be used as interface identifier by IPv6 */
1603 dev->addr_assign_type = NET_ADDR_RANDOM;
1604 eth_random_addr(dev->perm_addr);
1605}
1606
1607
1608/**
1609 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1610 * @dev: virtual device associated with tunnel
1611 **/
1612
1613static inline int
1614ip6_tnl_dev_init_gen(struct net_device *dev)
1615{
1616 struct ip6_tnl *t = netdev_priv(dev);
1617 int ret;
1618
1619 t->dev = dev;
1620 t->net = dev_net(dev);
1621 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1622 if (!dev->tstats)
1623 return -ENOMEM;
1624
1625 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1626 if (ret)
1627 goto free_stats;
1628
1629 ret = gro_cells_init(&t->gro_cells, dev);
1630 if (ret)
1631 goto destroy_dst;
1632
1633 t->hlen = 0;
1634 t->tun_hlen = 0;
1635
1636 return 0;
1637
1638destroy_dst:
1639 dst_cache_destroy(&t->dst_cache);
1640free_stats:
1641 free_percpu(dev->tstats);
1642 dev->tstats = NULL;
1643
1644 return ret;
1645}
1646
1647/**
1648 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1649 * @dev: virtual device associated with tunnel
1650 **/
1651
1652static int ip6_tnl_dev_init(struct net_device *dev)
1653{
1654 struct ip6_tnl *t = netdev_priv(dev);
1655 int err = ip6_tnl_dev_init_gen(dev);
1656
1657 if (err)
1658 return err;
1659 ip6_tnl_link_config(t);
1660 return 0;
1661}
1662
1663/**
1664 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1665 * @dev: fallback device
1666 *
1667 * Return: 0
1668 **/
1669
1670static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1671{
1672 struct ip6_tnl *t = netdev_priv(dev);
1673 struct net *net = dev_net(dev);
1674 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1675
1676 t->parms.proto = IPPROTO_IPV6;
1677 dev_hold(dev);
1678
1679 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1680 return 0;
1681}
1682
1683static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1684{
1685 u8 proto;
1686
1687 if (!data || !data[IFLA_IPTUN_PROTO])
1688 return 0;
1689
1690 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1691 if (proto != IPPROTO_IPV6 &&
1692 proto != IPPROTO_IPIP &&
1693 proto != 0)
1694 return -EINVAL;
1695
1696 return 0;
1697}
1698
1699static void ip6_tnl_netlink_parms(struct nlattr *data[],
1700 struct __ip6_tnl_parm *parms)
1701{
1702 memset(parms, 0, sizeof(*parms));
1703
1704 if (!data)
1705 return;
1706
1707 if (data[IFLA_IPTUN_LINK])
1708 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1709
1710 if (data[IFLA_IPTUN_LOCAL])
1711 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1712
1713 if (data[IFLA_IPTUN_REMOTE])
1714 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1715
1716 if (data[IFLA_IPTUN_TTL])
1717 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1718
1719 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1720 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1721
1722 if (data[IFLA_IPTUN_FLOWINFO])
1723 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1724
1725 if (data[IFLA_IPTUN_FLAGS])
1726 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1727
1728 if (data[IFLA_IPTUN_PROTO])
1729 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1730}
1731
1732static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1733 struct nlattr *tb[], struct nlattr *data[])
1734{
1735 struct net *net = dev_net(dev);
1736 struct ip6_tnl *nt, *t;
1737
1738 nt = netdev_priv(dev);
1739 ip6_tnl_netlink_parms(data, &nt->parms);
1740
1741 t = ip6_tnl_locate(net, &nt->parms, 0);
1742 if (!IS_ERR(t))
1743 return -EEXIST;
1744
1745 return ip6_tnl_create2(dev);
1746}
1747
1748static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1749 struct nlattr *data[])
1750{
1751 struct ip6_tnl *t = netdev_priv(dev);
1752 struct __ip6_tnl_parm p;
1753 struct net *net = t->net;
1754 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1755
1756 if (dev == ip6n->fb_tnl_dev)
1757 return -EINVAL;
1758
1759 ip6_tnl_netlink_parms(data, &p);
1760
1761 t = ip6_tnl_locate(net, &p, 0);
1762 if (!IS_ERR(t)) {
1763 if (t->dev != dev)
1764 return -EEXIST;
1765 } else
1766 t = netdev_priv(dev);
1767
1768 return ip6_tnl_update(t, &p);
1769}
1770
1771static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1772{
1773 struct net *net = dev_net(dev);
1774 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1775
1776 if (dev != ip6n->fb_tnl_dev)
1777 unregister_netdevice_queue(dev, head);
1778}
1779
1780static size_t ip6_tnl_get_size(const struct net_device *dev)
1781{
1782 return
1783 /* IFLA_IPTUN_LINK */
1784 nla_total_size(4) +
1785 /* IFLA_IPTUN_LOCAL */
1786 nla_total_size(sizeof(struct in6_addr)) +
1787 /* IFLA_IPTUN_REMOTE */
1788 nla_total_size(sizeof(struct in6_addr)) +
1789 /* IFLA_IPTUN_TTL */
1790 nla_total_size(1) +
1791 /* IFLA_IPTUN_ENCAP_LIMIT */
1792 nla_total_size(1) +
1793 /* IFLA_IPTUN_FLOWINFO */
1794 nla_total_size(4) +
1795 /* IFLA_IPTUN_FLAGS */
1796 nla_total_size(4) +
1797 /* IFLA_IPTUN_PROTO */
1798 nla_total_size(1) +
1799 0;
1800}
1801
1802static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1803{
1804 struct ip6_tnl *tunnel = netdev_priv(dev);
1805 struct __ip6_tnl_parm *parm = &tunnel->parms;
1806
1807 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1808 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
1809 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
1810 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1811 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1812 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1813 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1814 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1815 goto nla_put_failure;
1816 return 0;
1817
1818nla_put_failure:
1819 return -EMSGSIZE;
1820}
1821
1822struct net *ip6_tnl_get_link_net(const struct net_device *dev)
1823{
1824 struct ip6_tnl *tunnel = netdev_priv(dev);
1825
1826 return tunnel->net;
1827}
1828EXPORT_SYMBOL(ip6_tnl_get_link_net);
1829
1830static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1831 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1832 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1833 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1834 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1835 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1836 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1837 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1838 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1839};
1840
1841static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1842 .kind = "ip6tnl",
1843 .maxtype = IFLA_IPTUN_MAX,
1844 .policy = ip6_tnl_policy,
1845 .priv_size = sizeof(struct ip6_tnl),
1846 .setup = ip6_tnl_dev_setup,
1847 .validate = ip6_tnl_validate,
1848 .newlink = ip6_tnl_newlink,
1849 .changelink = ip6_tnl_changelink,
1850 .dellink = ip6_tnl_dellink,
1851 .get_size = ip6_tnl_get_size,
1852 .fill_info = ip6_tnl_fill_info,
1853 .get_link_net = ip6_tnl_get_link_net,
1854};
1855
1856static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1857 .handler = ip4ip6_rcv,
1858 .err_handler = ip4ip6_err,
1859 .priority = 1,
1860};
1861
1862static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1863 .handler = ip6ip6_rcv,
1864 .err_handler = ip6ip6_err,
1865 .priority = 1,
1866};
1867
1868static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1869{
1870 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1871 struct net_device *dev, *aux;
1872 int h;
1873 struct ip6_tnl *t;
1874 LIST_HEAD(list);
1875
1876 for_each_netdev_safe(net, dev, aux)
1877 if (dev->rtnl_link_ops == &ip6_link_ops)
1878 unregister_netdevice_queue(dev, &list);
1879
1880 for (h = 0; h < HASH_SIZE; h++) {
1881 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1882 while (t) {
1883 /* If dev is in the same netns, it has already
1884 * been added to the list by the previous loop.
1885 */
1886 if (!net_eq(dev_net(t->dev), net))
1887 unregister_netdevice_queue(t->dev, &list);
1888 t = rtnl_dereference(t->next);
1889 }
1890 }
1891
1892 unregister_netdevice_many(&list);
1893}
1894
1895static int __net_init ip6_tnl_init_net(struct net *net)
1896{
1897 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1898 struct ip6_tnl *t = NULL;
1899 int err;
1900
1901 ip6n->tnls[0] = ip6n->tnls_wc;
1902 ip6n->tnls[1] = ip6n->tnls_r_l;
1903
1904 err = -ENOMEM;
1905 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1906 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
1907
1908 if (!ip6n->fb_tnl_dev)
1909 goto err_alloc_dev;
1910 dev_net_set(ip6n->fb_tnl_dev, net);
1911 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1912 /* FB netdevice is special: we have one, and only one per netns.
1913 * Allowing to move it to another netns is clearly unsafe.
1914 */
1915 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1916
1917 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1918 if (err < 0)
1919 goto err_register;
1920
1921 err = register_netdev(ip6n->fb_tnl_dev);
1922 if (err < 0)
1923 goto err_register;
1924
1925 t = netdev_priv(ip6n->fb_tnl_dev);
1926
1927 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1928 return 0;
1929
1930err_register:
1931 ip6_dev_free(ip6n->fb_tnl_dev);
1932err_alloc_dev:
1933 return err;
1934}
1935
1936static void __net_exit ip6_tnl_exit_net(struct net *net)
1937{
1938 rtnl_lock();
1939 ip6_tnl_destroy_tunnels(net);
1940 rtnl_unlock();
1941}
1942
1943static struct pernet_operations ip6_tnl_net_ops = {
1944 .init = ip6_tnl_init_net,
1945 .exit = ip6_tnl_exit_net,
1946 .id = &ip6_tnl_net_id,
1947 .size = sizeof(struct ip6_tnl_net),
1948};
1949
1950/**
1951 * ip6_tunnel_init - register protocol and reserve needed resources
1952 *
1953 * Return: 0 on success
1954 **/
1955
1956static int __init ip6_tunnel_init(void)
1957{
1958 int err;
1959
1960 err = register_pernet_device(&ip6_tnl_net_ops);
1961 if (err < 0)
1962 goto out_pernet;
1963
1964 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1965 if (err < 0) {
1966 pr_err("%s: can't register ip4ip6\n", __func__);
1967 goto out_ip4ip6;
1968 }
1969
1970 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1971 if (err < 0) {
1972 pr_err("%s: can't register ip6ip6\n", __func__);
1973 goto out_ip6ip6;
1974 }
1975 err = rtnl_link_register(&ip6_link_ops);
1976 if (err < 0)
1977 goto rtnl_link_failed;
1978
1979 return 0;
1980
1981rtnl_link_failed:
1982 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1983out_ip6ip6:
1984 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1985out_ip4ip6:
1986 unregister_pernet_device(&ip6_tnl_net_ops);
1987out_pernet:
1988 return err;
1989}
1990
1991/**
1992 * ip6_tunnel_cleanup - free resources and unregister protocol
1993 **/
1994
1995static void __exit ip6_tunnel_cleanup(void)
1996{
1997 rtnl_link_unregister(&ip6_link_ops);
1998 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1999 pr_info("%s: can't deregister ip4ip6\n", __func__);
2000
2001 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2002 pr_info("%s: can't deregister ip6ip6\n", __func__);
2003
2004 unregister_pernet_device(&ip6_tnl_net_ops);
2005}
2006
2007module_init(ip6_tunnel_init);
2008module_exit(ip6_tunnel_cleanup);
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