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1/*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21#include <linux/module.h>
22#include <linux/capability.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/sockios.h>
26#include <linux/icmp.h>
27#include <linux/if.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/if_tunnel.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/netdevice.h>
34#include <linux/if_arp.h>
35#include <linux/icmpv6.h>
36#include <linux/init.h>
37#include <linux/route.h>
38#include <linux/rtnetlink.h>
39#include <linux/netfilter_ipv6.h>
40#include <linux/slab.h>
41
42#include <asm/uaccess.h>
43#include <linux/atomic.h>
44
45#include <net/icmp.h>
46#include <net/ip.h>
47#include <net/ipv6.h>
48#include <net/ip6_route.h>
49#include <net/addrconf.h>
50#include <net/ip6_tunnel.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
53#include <net/inet_ecn.h>
54#include <net/net_namespace.h>
55#include <net/netns/generic.h>
56
57MODULE_AUTHOR("Ville Nuorvala");
58MODULE_DESCRIPTION("IPv6 tunneling device");
59MODULE_LICENSE("GPL");
60MODULE_ALIAS_NETDEV("ip6tnl0");
61
62#ifdef IP6_TNL_DEBUG
63#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
64#else
65#define IP6_TNL_TRACE(x...) do {;} while(0)
66#endif
67
68#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
69#define IPV6_TCLASS_SHIFT 20
70
71#define HASH_SIZE 32
72
73#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
74 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
75 (HASH_SIZE - 1))
76
77static int ip6_tnl_dev_init(struct net_device *dev);
78static void ip6_tnl_dev_setup(struct net_device *dev);
79
80static int ip6_tnl_net_id __read_mostly;
81struct ip6_tnl_net {
82 /* the IPv6 tunnel fallback device */
83 struct net_device *fb_tnl_dev;
84 /* lists for storing tunnels in use */
85 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
86 struct ip6_tnl __rcu *tnls_wc[1];
87 struct ip6_tnl __rcu **tnls[2];
88};
89
90/* often modified stats are per cpu, other are shared (netdev->stats) */
91struct pcpu_tstats {
92 unsigned long rx_packets;
93 unsigned long rx_bytes;
94 unsigned long tx_packets;
95 unsigned long tx_bytes;
96};
97
98static struct net_device_stats *ip6_get_stats(struct net_device *dev)
99{
100 struct pcpu_tstats sum = { 0 };
101 int i;
102
103 for_each_possible_cpu(i) {
104 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
105
106 sum.rx_packets += tstats->rx_packets;
107 sum.rx_bytes += tstats->rx_bytes;
108 sum.tx_packets += tstats->tx_packets;
109 sum.tx_bytes += tstats->tx_bytes;
110 }
111 dev->stats.rx_packets = sum.rx_packets;
112 dev->stats.rx_bytes = sum.rx_bytes;
113 dev->stats.tx_packets = sum.tx_packets;
114 dev->stats.tx_bytes = sum.tx_bytes;
115 return &dev->stats;
116}
117
118/*
119 * Locking : hash tables are protected by RCU and RTNL
120 */
121
122static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
123{
124 struct dst_entry *dst = t->dst_cache;
125
126 if (dst && dst->obsolete &&
127 dst->ops->check(dst, t->dst_cookie) == NULL) {
128 t->dst_cache = NULL;
129 dst_release(dst);
130 return NULL;
131 }
132
133 return dst;
134}
135
136static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
137{
138 dst_release(t->dst_cache);
139 t->dst_cache = NULL;
140}
141
142static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
143{
144 struct rt6_info *rt = (struct rt6_info *) dst;
145 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
146 dst_release(t->dst_cache);
147 t->dst_cache = dst;
148}
149
150/**
151 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
152 * @remote: the address of the tunnel exit-point
153 * @local: the address of the tunnel entry-point
154 *
155 * Return:
156 * tunnel matching given end-points if found,
157 * else fallback tunnel if its device is up,
158 * else %NULL
159 **/
160
161#define for_each_ip6_tunnel_rcu(start) \
162 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
163
164static struct ip6_tnl *
165ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
166{
167 unsigned int h0 = HASH(remote);
168 unsigned int h1 = HASH(local);
169 struct ip6_tnl *t;
170 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
171
172 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
173 if (ipv6_addr_equal(local, &t->parms.laddr) &&
174 ipv6_addr_equal(remote, &t->parms.raddr) &&
175 (t->dev->flags & IFF_UP))
176 return t;
177 }
178 t = rcu_dereference(ip6n->tnls_wc[0]);
179 if (t && (t->dev->flags & IFF_UP))
180 return t;
181
182 return NULL;
183}
184
185/**
186 * ip6_tnl_bucket - get head of list matching given tunnel parameters
187 * @p: parameters containing tunnel end-points
188 *
189 * Description:
190 * ip6_tnl_bucket() returns the head of the list matching the
191 * &struct in6_addr entries laddr and raddr in @p.
192 *
193 * Return: head of IPv6 tunnel list
194 **/
195
196static struct ip6_tnl __rcu **
197ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p)
198{
199 const struct in6_addr *remote = &p->raddr;
200 const struct in6_addr *local = &p->laddr;
201 unsigned h = 0;
202 int prio = 0;
203
204 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
205 prio = 1;
206 h = HASH(remote) ^ HASH(local);
207 }
208 return &ip6n->tnls[prio][h];
209}
210
211/**
212 * ip6_tnl_link - add tunnel to hash table
213 * @t: tunnel to be added
214 **/
215
216static void
217ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
218{
219 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
220
221 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
222 rcu_assign_pointer(*tp, t);
223}
224
225/**
226 * ip6_tnl_unlink - remove tunnel from hash table
227 * @t: tunnel to be removed
228 **/
229
230static void
231ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
232{
233 struct ip6_tnl __rcu **tp;
234 struct ip6_tnl *iter;
235
236 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
237 (iter = rtnl_dereference(*tp)) != NULL;
238 tp = &iter->next) {
239 if (t == iter) {
240 rcu_assign_pointer(*tp, t->next);
241 break;
242 }
243 }
244}
245
246static void ip6_dev_free(struct net_device *dev)
247{
248 free_percpu(dev->tstats);
249 free_netdev(dev);
250}
251
252/**
253 * ip6_tnl_create() - create a new tunnel
254 * @p: tunnel parameters
255 * @pt: pointer to new tunnel
256 *
257 * Description:
258 * Create tunnel matching given parameters.
259 *
260 * Return:
261 * created tunnel or NULL
262 **/
263
264static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
265{
266 struct net_device *dev;
267 struct ip6_tnl *t;
268 char name[IFNAMSIZ];
269 int err;
270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
271
272 if (p->name[0])
273 strlcpy(name, p->name, IFNAMSIZ);
274 else
275 sprintf(name, "ip6tnl%%d");
276
277 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
278 if (dev == NULL)
279 goto failed;
280
281 dev_net_set(dev, net);
282
283 t = netdev_priv(dev);
284 t->parms = *p;
285 err = ip6_tnl_dev_init(dev);
286 if (err < 0)
287 goto failed_free;
288
289 if ((err = register_netdevice(dev)) < 0)
290 goto failed_free;
291
292 dev_hold(dev);
293 ip6_tnl_link(ip6n, t);
294 return t;
295
296failed_free:
297 ip6_dev_free(dev);
298failed:
299 return NULL;
300}
301
302/**
303 * ip6_tnl_locate - find or create tunnel matching given parameters
304 * @p: tunnel parameters
305 * @create: != 0 if allowed to create new tunnel if no match found
306 *
307 * Description:
308 * ip6_tnl_locate() first tries to locate an existing tunnel
309 * based on @parms. If this is unsuccessful, but @create is set a new
310 * tunnel device is created and registered for use.
311 *
312 * Return:
313 * matching tunnel or NULL
314 **/
315
316static struct ip6_tnl *ip6_tnl_locate(struct net *net,
317 struct ip6_tnl_parm *p, int create)
318{
319 const struct in6_addr *remote = &p->raddr;
320 const struct in6_addr *local = &p->laddr;
321 struct ip6_tnl __rcu **tp;
322 struct ip6_tnl *t;
323 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
324
325 for (tp = ip6_tnl_bucket(ip6n, p);
326 (t = rtnl_dereference(*tp)) != NULL;
327 tp = &t->next) {
328 if (ipv6_addr_equal(local, &t->parms.laddr) &&
329 ipv6_addr_equal(remote, &t->parms.raddr))
330 return t;
331 }
332 if (!create)
333 return NULL;
334 return ip6_tnl_create(net, p);
335}
336
337/**
338 * ip6_tnl_dev_uninit - tunnel device uninitializer
339 * @dev: the device to be destroyed
340 *
341 * Description:
342 * ip6_tnl_dev_uninit() removes tunnel from its list
343 **/
344
345static void
346ip6_tnl_dev_uninit(struct net_device *dev)
347{
348 struct ip6_tnl *t = netdev_priv(dev);
349 struct net *net = dev_net(dev);
350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
351
352 if (dev == ip6n->fb_tnl_dev)
353 rcu_assign_pointer(ip6n->tnls_wc[0], NULL);
354 else
355 ip6_tnl_unlink(ip6n, t);
356 ip6_tnl_dst_reset(t);
357 dev_put(dev);
358}
359
360/**
361 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
362 * @skb: received socket buffer
363 *
364 * Return:
365 * 0 if none was found,
366 * else index to encapsulation limit
367 **/
368
369static __u16
370parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
371{
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
373 __u8 nexthdr = ipv6h->nexthdr;
374 __u16 off = sizeof (*ipv6h);
375
376 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
377 __u16 optlen = 0;
378 struct ipv6_opt_hdr *hdr;
379 if (raw + off + sizeof (*hdr) > skb->data &&
380 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
381 break;
382
383 hdr = (struct ipv6_opt_hdr *) (raw + off);
384 if (nexthdr == NEXTHDR_FRAGMENT) {
385 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
386 if (frag_hdr->frag_off)
387 break;
388 optlen = 8;
389 } else if (nexthdr == NEXTHDR_AUTH) {
390 optlen = (hdr->hdrlen + 2) << 2;
391 } else {
392 optlen = ipv6_optlen(hdr);
393 }
394 if (nexthdr == NEXTHDR_DEST) {
395 __u16 i = off + 2;
396 while (1) {
397 struct ipv6_tlv_tnl_enc_lim *tel;
398
399 /* No more room for encapsulation limit */
400 if (i + sizeof (*tel) > off + optlen)
401 break;
402
403 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
404 /* return index of option if found and valid */
405 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
406 tel->length == 1)
407 return i;
408 /* else jump to next option */
409 if (tel->type)
410 i += tel->length + 2;
411 else
412 i++;
413 }
414 }
415 nexthdr = hdr->nexthdr;
416 off += optlen;
417 }
418 return 0;
419}
420
421/**
422 * ip6_tnl_err - tunnel error handler
423 *
424 * Description:
425 * ip6_tnl_err() should handle errors in the tunnel according
426 * to the specifications in RFC 2473.
427 **/
428
429static int
430ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
431 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
432{
433 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
434 struct ip6_tnl *t;
435 int rel_msg = 0;
436 u8 rel_type = ICMPV6_DEST_UNREACH;
437 u8 rel_code = ICMPV6_ADDR_UNREACH;
438 __u32 rel_info = 0;
439 __u16 len;
440 int err = -ENOENT;
441
442 /* If the packet doesn't contain the original IPv6 header we are
443 in trouble since we might need the source address for further
444 processing of the error. */
445
446 rcu_read_lock();
447 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
448 &ipv6h->saddr)) == NULL)
449 goto out;
450
451 if (t->parms.proto != ipproto && t->parms.proto != 0)
452 goto out;
453
454 err = 0;
455
456 switch (*type) {
457 __u32 teli;
458 struct ipv6_tlv_tnl_enc_lim *tel;
459 __u32 mtu;
460 case ICMPV6_DEST_UNREACH:
461 if (net_ratelimit())
462 printk(KERN_WARNING
463 "%s: Path to destination invalid "
464 "or inactive!\n", t->parms.name);
465 rel_msg = 1;
466 break;
467 case ICMPV6_TIME_EXCEED:
468 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
469 if (net_ratelimit())
470 printk(KERN_WARNING
471 "%s: Too small hop limit or "
472 "routing loop in tunnel!\n",
473 t->parms.name);
474 rel_msg = 1;
475 }
476 break;
477 case ICMPV6_PARAMPROB:
478 teli = 0;
479 if ((*code) == ICMPV6_HDR_FIELD)
480 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
481
482 if (teli && teli == *info - 2) {
483 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
484 if (tel->encap_limit == 0) {
485 if (net_ratelimit())
486 printk(KERN_WARNING
487 "%s: Too small encapsulation "
488 "limit or routing loop in "
489 "tunnel!\n", t->parms.name);
490 rel_msg = 1;
491 }
492 } else if (net_ratelimit()) {
493 printk(KERN_WARNING
494 "%s: Recipient unable to parse tunneled "
495 "packet!\n ", t->parms.name);
496 }
497 break;
498 case ICMPV6_PKT_TOOBIG:
499 mtu = *info - offset;
500 if (mtu < IPV6_MIN_MTU)
501 mtu = IPV6_MIN_MTU;
502 t->dev->mtu = mtu;
503
504 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
505 rel_type = ICMPV6_PKT_TOOBIG;
506 rel_code = 0;
507 rel_info = mtu;
508 rel_msg = 1;
509 }
510 break;
511 }
512
513 *type = rel_type;
514 *code = rel_code;
515 *info = rel_info;
516 *msg = rel_msg;
517
518out:
519 rcu_read_unlock();
520 return err;
521}
522
523static int
524ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
525 u8 type, u8 code, int offset, __be32 info)
526{
527 int rel_msg = 0;
528 u8 rel_type = type;
529 u8 rel_code = code;
530 __u32 rel_info = ntohl(info);
531 int err;
532 struct sk_buff *skb2;
533 const struct iphdr *eiph;
534 struct rtable *rt;
535 struct flowi4 fl4;
536
537 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
538 &rel_msg, &rel_info, offset);
539 if (err < 0)
540 return err;
541
542 if (rel_msg == 0)
543 return 0;
544
545 switch (rel_type) {
546 case ICMPV6_DEST_UNREACH:
547 if (rel_code != ICMPV6_ADDR_UNREACH)
548 return 0;
549 rel_type = ICMP_DEST_UNREACH;
550 rel_code = ICMP_HOST_UNREACH;
551 break;
552 case ICMPV6_PKT_TOOBIG:
553 if (rel_code != 0)
554 return 0;
555 rel_type = ICMP_DEST_UNREACH;
556 rel_code = ICMP_FRAG_NEEDED;
557 break;
558 default:
559 return 0;
560 }
561
562 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
563 return 0;
564
565 skb2 = skb_clone(skb, GFP_ATOMIC);
566 if (!skb2)
567 return 0;
568
569 skb_dst_drop(skb2);
570
571 skb_pull(skb2, offset);
572 skb_reset_network_header(skb2);
573 eiph = ip_hdr(skb2);
574
575 /* Try to guess incoming interface */
576 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
577 eiph->saddr, 0,
578 0, 0,
579 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
580 if (IS_ERR(rt))
581 goto out;
582
583 skb2->dev = rt->dst.dev;
584
585 /* route "incoming" packet */
586 if (rt->rt_flags & RTCF_LOCAL) {
587 ip_rt_put(rt);
588 rt = NULL;
589 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
590 eiph->daddr, eiph->saddr,
591 0, 0,
592 IPPROTO_IPIP,
593 RT_TOS(eiph->tos), 0);
594 if (IS_ERR(rt) ||
595 rt->dst.dev->type != ARPHRD_TUNNEL) {
596 if (!IS_ERR(rt))
597 ip_rt_put(rt);
598 goto out;
599 }
600 skb_dst_set(skb2, &rt->dst);
601 } else {
602 ip_rt_put(rt);
603 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
604 skb2->dev) ||
605 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
606 goto out;
607 }
608
609 /* change mtu on this route */
610 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
611 if (rel_info > dst_mtu(skb_dst(skb2)))
612 goto out;
613
614 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
615 }
616
617 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
618
619out:
620 kfree_skb(skb2);
621 return 0;
622}
623
624static int
625ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
626 u8 type, u8 code, int offset, __be32 info)
627{
628 int rel_msg = 0;
629 u8 rel_type = type;
630 u8 rel_code = code;
631 __u32 rel_info = ntohl(info);
632 int err;
633
634 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
635 &rel_msg, &rel_info, offset);
636 if (err < 0)
637 return err;
638
639 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
640 struct rt6_info *rt;
641 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
642
643 if (!skb2)
644 return 0;
645
646 skb_dst_drop(skb2);
647 skb_pull(skb2, offset);
648 skb_reset_network_header(skb2);
649
650 /* Try to guess incoming interface */
651 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
652 NULL, 0, 0);
653
654 if (rt && rt->rt6i_dev)
655 skb2->dev = rt->rt6i_dev;
656
657 icmpv6_send(skb2, rel_type, rel_code, rel_info);
658
659 if (rt)
660 dst_release(&rt->dst);
661
662 kfree_skb(skb2);
663 }
664
665 return 0;
666}
667
668static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
669 const struct ipv6hdr *ipv6h,
670 struct sk_buff *skb)
671{
672 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
673
674 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
675 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
676
677 if (INET_ECN_is_ce(dsfield))
678 IP_ECN_set_ce(ip_hdr(skb));
679}
680
681static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
682 const struct ipv6hdr *ipv6h,
683 struct sk_buff *skb)
684{
685 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
686 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
687
688 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
689 IP6_ECN_set_ce(ipv6_hdr(skb));
690}
691
692/* called with rcu_read_lock() */
693static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
694{
695 struct ip6_tnl_parm *p = &t->parms;
696 int ret = 0;
697 struct net *net = dev_net(t->dev);
698
699 if (p->flags & IP6_TNL_F_CAP_RCV) {
700 struct net_device *ldev = NULL;
701
702 if (p->link)
703 ldev = dev_get_by_index_rcu(net, p->link);
704
705 if ((ipv6_addr_is_multicast(&p->laddr) ||
706 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
707 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
708 ret = 1;
709
710 }
711 return ret;
712}
713
714/**
715 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
716 * @skb: received socket buffer
717 * @protocol: ethernet protocol ID
718 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
719 *
720 * Return: 0
721 **/
722
723static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
724 __u8 ipproto,
725 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
726 const struct ipv6hdr *ipv6h,
727 struct sk_buff *skb))
728{
729 struct ip6_tnl *t;
730 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
731
732 rcu_read_lock();
733
734 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
735 &ipv6h->daddr)) != NULL) {
736 struct pcpu_tstats *tstats;
737
738 if (t->parms.proto != ipproto && t->parms.proto != 0) {
739 rcu_read_unlock();
740 goto discard;
741 }
742
743 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
744 rcu_read_unlock();
745 goto discard;
746 }
747
748 if (!ip6_tnl_rcv_ctl(t)) {
749 t->dev->stats.rx_dropped++;
750 rcu_read_unlock();
751 goto discard;
752 }
753 secpath_reset(skb);
754 skb->mac_header = skb->network_header;
755 skb_reset_network_header(skb);
756 skb->protocol = htons(protocol);
757 skb->pkt_type = PACKET_HOST;
758 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
759
760 tstats = this_cpu_ptr(t->dev->tstats);
761 tstats->rx_packets++;
762 tstats->rx_bytes += skb->len;
763
764 __skb_tunnel_rx(skb, t->dev);
765
766 dscp_ecn_decapsulate(t, ipv6h, skb);
767
768 netif_rx(skb);
769
770 rcu_read_unlock();
771 return 0;
772 }
773 rcu_read_unlock();
774 return 1;
775
776discard:
777 kfree_skb(skb);
778 return 0;
779}
780
781static int ip4ip6_rcv(struct sk_buff *skb)
782{
783 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
784 ip4ip6_dscp_ecn_decapsulate);
785}
786
787static int ip6ip6_rcv(struct sk_buff *skb)
788{
789 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
790 ip6ip6_dscp_ecn_decapsulate);
791}
792
793struct ipv6_tel_txoption {
794 struct ipv6_txoptions ops;
795 __u8 dst_opt[8];
796};
797
798static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
799{
800 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
801
802 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
803 opt->dst_opt[3] = 1;
804 opt->dst_opt[4] = encap_limit;
805 opt->dst_opt[5] = IPV6_TLV_PADN;
806 opt->dst_opt[6] = 1;
807
808 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
809 opt->ops.opt_nflen = 8;
810}
811
812/**
813 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
814 * @t: the outgoing tunnel device
815 * @hdr: IPv6 header from the incoming packet
816 *
817 * Description:
818 * Avoid trivial tunneling loop by checking that tunnel exit-point
819 * doesn't match source of incoming packet.
820 *
821 * Return:
822 * 1 if conflict,
823 * 0 else
824 **/
825
826static inline int
827ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
828{
829 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
830}
831
832static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
833{
834 struct ip6_tnl_parm *p = &t->parms;
835 int ret = 0;
836 struct net *net = dev_net(t->dev);
837
838 if (p->flags & IP6_TNL_F_CAP_XMIT) {
839 struct net_device *ldev = NULL;
840
841 rcu_read_lock();
842 if (p->link)
843 ldev = dev_get_by_index_rcu(net, p->link);
844
845 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
846 printk(KERN_WARNING
847 "%s xmit: Local address not yet configured!\n",
848 p->name);
849 else if (!ipv6_addr_is_multicast(&p->raddr) &&
850 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
851 printk(KERN_WARNING
852 "%s xmit: Routing loop! "
853 "Remote address found on this node!\n",
854 p->name);
855 else
856 ret = 1;
857 rcu_read_unlock();
858 }
859 return ret;
860}
861/**
862 * ip6_tnl_xmit2 - encapsulate packet and send
863 * @skb: the outgoing socket buffer
864 * @dev: the outgoing tunnel device
865 * @dsfield: dscp code for outer header
866 * @fl: flow of tunneled packet
867 * @encap_limit: encapsulation limit
868 * @pmtu: Path MTU is stored if packet is too big
869 *
870 * Description:
871 * Build new header and do some sanity checks on the packet before sending
872 * it.
873 *
874 * Return:
875 * 0 on success
876 * -1 fail
877 * %-EMSGSIZE message too big. return mtu in this case.
878 **/
879
880static int ip6_tnl_xmit2(struct sk_buff *skb,
881 struct net_device *dev,
882 __u8 dsfield,
883 struct flowi6 *fl6,
884 int encap_limit,
885 __u32 *pmtu)
886{
887 struct net *net = dev_net(dev);
888 struct ip6_tnl *t = netdev_priv(dev);
889 struct net_device_stats *stats = &t->dev->stats;
890 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
891 struct ipv6_tel_txoption opt;
892 struct dst_entry *dst;
893 struct net_device *tdev;
894 int mtu;
895 unsigned int max_headroom = sizeof(struct ipv6hdr);
896 u8 proto;
897 int err = -1;
898 int pkt_len;
899
900 if ((dst = ip6_tnl_dst_check(t)) != NULL)
901 dst_hold(dst);
902 else {
903 dst = ip6_route_output(net, NULL, fl6);
904
905 if (dst->error)
906 goto tx_err_link_failure;
907 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
908 if (IS_ERR(dst)) {
909 err = PTR_ERR(dst);
910 dst = NULL;
911 goto tx_err_link_failure;
912 }
913 }
914
915 tdev = dst->dev;
916
917 if (tdev == dev) {
918 stats->collisions++;
919 if (net_ratelimit())
920 printk(KERN_WARNING
921 "%s: Local routing loop detected!\n",
922 t->parms.name);
923 goto tx_err_dst_release;
924 }
925 mtu = dst_mtu(dst) - sizeof (*ipv6h);
926 if (encap_limit >= 0) {
927 max_headroom += 8;
928 mtu -= 8;
929 }
930 if (mtu < IPV6_MIN_MTU)
931 mtu = IPV6_MIN_MTU;
932 if (skb_dst(skb))
933 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
934 if (skb->len > mtu) {
935 *pmtu = mtu;
936 err = -EMSGSIZE;
937 goto tx_err_dst_release;
938 }
939
940 /*
941 * Okay, now see if we can stuff it in the buffer as-is.
942 */
943 max_headroom += LL_RESERVED_SPACE(tdev);
944
945 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
946 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
947 struct sk_buff *new_skb;
948
949 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
950 goto tx_err_dst_release;
951
952 if (skb->sk)
953 skb_set_owner_w(new_skb, skb->sk);
954 kfree_skb(skb);
955 skb = new_skb;
956 }
957 skb_dst_drop(skb);
958 skb_dst_set(skb, dst_clone(dst));
959
960 skb->transport_header = skb->network_header;
961
962 proto = fl6->flowi6_proto;
963 if (encap_limit >= 0) {
964 init_tel_txopt(&opt, encap_limit);
965 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
966 }
967 skb_push(skb, sizeof(struct ipv6hdr));
968 skb_reset_network_header(skb);
969 ipv6h = ipv6_hdr(skb);
970 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
971 dsfield = INET_ECN_encapsulate(0, dsfield);
972 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
973 ipv6h->hop_limit = t->parms.hop_limit;
974 ipv6h->nexthdr = proto;
975 ipv6_addr_copy(&ipv6h->saddr, &fl6->saddr);
976 ipv6_addr_copy(&ipv6h->daddr, &fl6->daddr);
977 nf_reset(skb);
978 pkt_len = skb->len;
979 err = ip6_local_out(skb);
980
981 if (net_xmit_eval(err) == 0) {
982 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
983
984 tstats->tx_bytes += pkt_len;
985 tstats->tx_packets++;
986 } else {
987 stats->tx_errors++;
988 stats->tx_aborted_errors++;
989 }
990 ip6_tnl_dst_store(t, dst);
991 return 0;
992tx_err_link_failure:
993 stats->tx_carrier_errors++;
994 dst_link_failure(skb);
995tx_err_dst_release:
996 dst_release(dst);
997 return err;
998}
999
1000static inline int
1001ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1002{
1003 struct ip6_tnl *t = netdev_priv(dev);
1004 const struct iphdr *iph = ip_hdr(skb);
1005 int encap_limit = -1;
1006 struct flowi6 fl6;
1007 __u8 dsfield;
1008 __u32 mtu;
1009 int err;
1010
1011 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1012 !ip6_tnl_xmit_ctl(t))
1013 return -1;
1014
1015 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1016 encap_limit = t->parms.encap_limit;
1017
1018 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1019 fl6.flowi6_proto = IPPROTO_IPIP;
1020
1021 dsfield = ipv4_get_dsfield(iph);
1022
1023 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1024 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1025 & IPV6_TCLASS_MASK;
1026
1027 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1028 if (err != 0) {
1029 /* XXX: send ICMP error even if DF is not set. */
1030 if (err == -EMSGSIZE)
1031 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1032 htonl(mtu));
1033 return -1;
1034 }
1035
1036 return 0;
1037}
1038
1039static inline int
1040ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1041{
1042 struct ip6_tnl *t = netdev_priv(dev);
1043 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1044 int encap_limit = -1;
1045 __u16 offset;
1046 struct flowi6 fl6;
1047 __u8 dsfield;
1048 __u32 mtu;
1049 int err;
1050
1051 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1052 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1053 return -1;
1054
1055 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1056 if (offset > 0) {
1057 struct ipv6_tlv_tnl_enc_lim *tel;
1058 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1059 if (tel->encap_limit == 0) {
1060 icmpv6_send(skb, ICMPV6_PARAMPROB,
1061 ICMPV6_HDR_FIELD, offset + 2);
1062 return -1;
1063 }
1064 encap_limit = tel->encap_limit - 1;
1065 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1066 encap_limit = t->parms.encap_limit;
1067
1068 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1069 fl6.flowi6_proto = IPPROTO_IPV6;
1070
1071 dsfield = ipv6_get_dsfield(ipv6h);
1072 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1073 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1074 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1075 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1076
1077 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1078 if (err != 0) {
1079 if (err == -EMSGSIZE)
1080 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1081 return -1;
1082 }
1083
1084 return 0;
1085}
1086
1087static netdev_tx_t
1088ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1089{
1090 struct ip6_tnl *t = netdev_priv(dev);
1091 struct net_device_stats *stats = &t->dev->stats;
1092 int ret;
1093
1094 switch (skb->protocol) {
1095 case htons(ETH_P_IP):
1096 ret = ip4ip6_tnl_xmit(skb, dev);
1097 break;
1098 case htons(ETH_P_IPV6):
1099 ret = ip6ip6_tnl_xmit(skb, dev);
1100 break;
1101 default:
1102 goto tx_err;
1103 }
1104
1105 if (ret < 0)
1106 goto tx_err;
1107
1108 return NETDEV_TX_OK;
1109
1110tx_err:
1111 stats->tx_errors++;
1112 stats->tx_dropped++;
1113 kfree_skb(skb);
1114 return NETDEV_TX_OK;
1115}
1116
1117static void ip6_tnl_set_cap(struct ip6_tnl *t)
1118{
1119 struct ip6_tnl_parm *p = &t->parms;
1120 int ltype = ipv6_addr_type(&p->laddr);
1121 int rtype = ipv6_addr_type(&p->raddr);
1122
1123 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1124
1125 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1126 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1127 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
1128 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
1129 if (ltype&IPV6_ADDR_UNICAST)
1130 p->flags |= IP6_TNL_F_CAP_XMIT;
1131 if (rtype&IPV6_ADDR_UNICAST)
1132 p->flags |= IP6_TNL_F_CAP_RCV;
1133 }
1134}
1135
1136static void ip6_tnl_link_config(struct ip6_tnl *t)
1137{
1138 struct net_device *dev = t->dev;
1139 struct ip6_tnl_parm *p = &t->parms;
1140 struct flowi6 *fl6 = &t->fl.u.ip6;
1141
1142 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1143 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1144
1145 /* Set up flowi template */
1146 ipv6_addr_copy(&fl6->saddr, &p->laddr);
1147 ipv6_addr_copy(&fl6->daddr, &p->raddr);
1148 fl6->flowi6_oif = p->link;
1149 fl6->flowlabel = 0;
1150
1151 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1152 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1153 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1154 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1155
1156 ip6_tnl_set_cap(t);
1157
1158 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1159 dev->flags |= IFF_POINTOPOINT;
1160 else
1161 dev->flags &= ~IFF_POINTOPOINT;
1162
1163 dev->iflink = p->link;
1164
1165 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1166 int strict = (ipv6_addr_type(&p->raddr) &
1167 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1168
1169 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1170 &p->raddr, &p->laddr,
1171 p->link, strict);
1172
1173 if (rt == NULL)
1174 return;
1175
1176 if (rt->rt6i_dev) {
1177 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1178 sizeof (struct ipv6hdr);
1179
1180 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1181 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1182 dev->mtu-=8;
1183
1184 if (dev->mtu < IPV6_MIN_MTU)
1185 dev->mtu = IPV6_MIN_MTU;
1186 }
1187 dst_release(&rt->dst);
1188 }
1189}
1190
1191/**
1192 * ip6_tnl_change - update the tunnel parameters
1193 * @t: tunnel to be changed
1194 * @p: tunnel configuration parameters
1195 *
1196 * Description:
1197 * ip6_tnl_change() updates the tunnel parameters
1198 **/
1199
1200static int
1201ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
1202{
1203 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1204 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1205 t->parms.flags = p->flags;
1206 t->parms.hop_limit = p->hop_limit;
1207 t->parms.encap_limit = p->encap_limit;
1208 t->parms.flowinfo = p->flowinfo;
1209 t->parms.link = p->link;
1210 t->parms.proto = p->proto;
1211 ip6_tnl_dst_reset(t);
1212 ip6_tnl_link_config(t);
1213 return 0;
1214}
1215
1216/**
1217 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1218 * @dev: virtual device associated with tunnel
1219 * @ifr: parameters passed from userspace
1220 * @cmd: command to be performed
1221 *
1222 * Description:
1223 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1224 * from userspace.
1225 *
1226 * The possible commands are the following:
1227 * %SIOCGETTUNNEL: get tunnel parameters for device
1228 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1229 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1230 * %SIOCDELTUNNEL: delete tunnel
1231 *
1232 * The fallback device "ip6tnl0", created during module
1233 * initialization, can be used for creating other tunnel devices.
1234 *
1235 * Return:
1236 * 0 on success,
1237 * %-EFAULT if unable to copy data to or from userspace,
1238 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1239 * %-EINVAL if passed tunnel parameters are invalid,
1240 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1241 * %-ENODEV if attempting to change or delete a nonexisting device
1242 **/
1243
1244static int
1245ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1246{
1247 int err = 0;
1248 struct ip6_tnl_parm p;
1249 struct ip6_tnl *t = NULL;
1250 struct net *net = dev_net(dev);
1251 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1252
1253 switch (cmd) {
1254 case SIOCGETTUNNEL:
1255 if (dev == ip6n->fb_tnl_dev) {
1256 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1257 err = -EFAULT;
1258 break;
1259 }
1260 t = ip6_tnl_locate(net, &p, 0);
1261 }
1262 if (t == NULL)
1263 t = netdev_priv(dev);
1264 memcpy(&p, &t->parms, sizeof (p));
1265 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1266 err = -EFAULT;
1267 }
1268 break;
1269 case SIOCADDTUNNEL:
1270 case SIOCCHGTUNNEL:
1271 err = -EPERM;
1272 if (!capable(CAP_NET_ADMIN))
1273 break;
1274 err = -EFAULT;
1275 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1276 break;
1277 err = -EINVAL;
1278 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1279 p.proto != 0)
1280 break;
1281 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
1282 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1283 if (t != NULL) {
1284 if (t->dev != dev) {
1285 err = -EEXIST;
1286 break;
1287 }
1288 } else
1289 t = netdev_priv(dev);
1290
1291 ip6_tnl_unlink(ip6n, t);
1292 synchronize_net();
1293 err = ip6_tnl_change(t, &p);
1294 ip6_tnl_link(ip6n, t);
1295 netdev_state_change(dev);
1296 }
1297 if (t) {
1298 err = 0;
1299 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1300 err = -EFAULT;
1301
1302 } else
1303 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1304 break;
1305 case SIOCDELTUNNEL:
1306 err = -EPERM;
1307 if (!capable(CAP_NET_ADMIN))
1308 break;
1309
1310 if (dev == ip6n->fb_tnl_dev) {
1311 err = -EFAULT;
1312 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1313 break;
1314 err = -ENOENT;
1315 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
1316 break;
1317 err = -EPERM;
1318 if (t->dev == ip6n->fb_tnl_dev)
1319 break;
1320 dev = t->dev;
1321 }
1322 err = 0;
1323 unregister_netdevice(dev);
1324 break;
1325 default:
1326 err = -EINVAL;
1327 }
1328 return err;
1329}
1330
1331/**
1332 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1333 * @dev: virtual device associated with tunnel
1334 * @new_mtu: the new mtu
1335 *
1336 * Return:
1337 * 0 on success,
1338 * %-EINVAL if mtu too small
1339 **/
1340
1341static int
1342ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1343{
1344 if (new_mtu < IPV6_MIN_MTU) {
1345 return -EINVAL;
1346 }
1347 dev->mtu = new_mtu;
1348 return 0;
1349}
1350
1351
1352static const struct net_device_ops ip6_tnl_netdev_ops = {
1353 .ndo_uninit = ip6_tnl_dev_uninit,
1354 .ndo_start_xmit = ip6_tnl_xmit,
1355 .ndo_do_ioctl = ip6_tnl_ioctl,
1356 .ndo_change_mtu = ip6_tnl_change_mtu,
1357 .ndo_get_stats = ip6_get_stats,
1358};
1359
1360
1361/**
1362 * ip6_tnl_dev_setup - setup virtual tunnel device
1363 * @dev: virtual device associated with tunnel
1364 *
1365 * Description:
1366 * Initialize function pointers and device parameters
1367 **/
1368
1369static void ip6_tnl_dev_setup(struct net_device *dev)
1370{
1371 struct ip6_tnl *t;
1372
1373 dev->netdev_ops = &ip6_tnl_netdev_ops;
1374 dev->destructor = ip6_dev_free;
1375
1376 dev->type = ARPHRD_TUNNEL6;
1377 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1378 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1379 t = netdev_priv(dev);
1380 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1381 dev->mtu-=8;
1382 dev->flags |= IFF_NOARP;
1383 dev->addr_len = sizeof(struct in6_addr);
1384 dev->features |= NETIF_F_NETNS_LOCAL;
1385 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1386}
1387
1388
1389/**
1390 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1391 * @dev: virtual device associated with tunnel
1392 **/
1393
1394static inline int
1395ip6_tnl_dev_init_gen(struct net_device *dev)
1396{
1397 struct ip6_tnl *t = netdev_priv(dev);
1398
1399 t->dev = dev;
1400 strcpy(t->parms.name, dev->name);
1401 dev->tstats = alloc_percpu(struct pcpu_tstats);
1402 if (!dev->tstats)
1403 return -ENOMEM;
1404 return 0;
1405}
1406
1407/**
1408 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1409 * @dev: virtual device associated with tunnel
1410 **/
1411
1412static int ip6_tnl_dev_init(struct net_device *dev)
1413{
1414 struct ip6_tnl *t = netdev_priv(dev);
1415 int err = ip6_tnl_dev_init_gen(dev);
1416
1417 if (err)
1418 return err;
1419 ip6_tnl_link_config(t);
1420 return 0;
1421}
1422
1423/**
1424 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1425 * @dev: fallback device
1426 *
1427 * Return: 0
1428 **/
1429
1430static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1431{
1432 struct ip6_tnl *t = netdev_priv(dev);
1433 struct net *net = dev_net(dev);
1434 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1435 int err = ip6_tnl_dev_init_gen(dev);
1436
1437 if (err)
1438 return err;
1439
1440 t->parms.proto = IPPROTO_IPV6;
1441 dev_hold(dev);
1442 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1443 return 0;
1444}
1445
1446static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1447 .handler = ip4ip6_rcv,
1448 .err_handler = ip4ip6_err,
1449 .priority = 1,
1450};
1451
1452static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1453 .handler = ip6ip6_rcv,
1454 .err_handler = ip6ip6_err,
1455 .priority = 1,
1456};
1457
1458static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
1459{
1460 int h;
1461 struct ip6_tnl *t;
1462 LIST_HEAD(list);
1463
1464 for (h = 0; h < HASH_SIZE; h++) {
1465 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1466 while (t != NULL) {
1467 unregister_netdevice_queue(t->dev, &list);
1468 t = rtnl_dereference(t->next);
1469 }
1470 }
1471
1472 t = rtnl_dereference(ip6n->tnls_wc[0]);
1473 unregister_netdevice_queue(t->dev, &list);
1474 unregister_netdevice_many(&list);
1475}
1476
1477static int __net_init ip6_tnl_init_net(struct net *net)
1478{
1479 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1480 int err;
1481
1482 ip6n->tnls[0] = ip6n->tnls_wc;
1483 ip6n->tnls[1] = ip6n->tnls_r_l;
1484
1485 err = -ENOMEM;
1486 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1487 ip6_tnl_dev_setup);
1488
1489 if (!ip6n->fb_tnl_dev)
1490 goto err_alloc_dev;
1491 dev_net_set(ip6n->fb_tnl_dev, net);
1492
1493 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1494 if (err < 0)
1495 goto err_register;
1496
1497 err = register_netdev(ip6n->fb_tnl_dev);
1498 if (err < 0)
1499 goto err_register;
1500 return 0;
1501
1502err_register:
1503 ip6_dev_free(ip6n->fb_tnl_dev);
1504err_alloc_dev:
1505 return err;
1506}
1507
1508static void __net_exit ip6_tnl_exit_net(struct net *net)
1509{
1510 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1511
1512 rtnl_lock();
1513 ip6_tnl_destroy_tunnels(ip6n);
1514 rtnl_unlock();
1515}
1516
1517static struct pernet_operations ip6_tnl_net_ops = {
1518 .init = ip6_tnl_init_net,
1519 .exit = ip6_tnl_exit_net,
1520 .id = &ip6_tnl_net_id,
1521 .size = sizeof(struct ip6_tnl_net),
1522};
1523
1524/**
1525 * ip6_tunnel_init - register protocol and reserve needed resources
1526 *
1527 * Return: 0 on success
1528 **/
1529
1530static int __init ip6_tunnel_init(void)
1531{
1532 int err;
1533
1534 err = register_pernet_device(&ip6_tnl_net_ops);
1535 if (err < 0)
1536 goto out_pernet;
1537
1538 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1539 if (err < 0) {
1540 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1541 goto out_ip4ip6;
1542 }
1543
1544 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1545 if (err < 0) {
1546 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1547 goto out_ip6ip6;
1548 }
1549
1550 return 0;
1551
1552out_ip6ip6:
1553 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1554out_ip4ip6:
1555 unregister_pernet_device(&ip6_tnl_net_ops);
1556out_pernet:
1557 return err;
1558}
1559
1560/**
1561 * ip6_tunnel_cleanup - free resources and unregister protocol
1562 **/
1563
1564static void __exit ip6_tunnel_cleanup(void)
1565{
1566 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1567 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
1568
1569 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1570 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
1571
1572 unregister_pernet_device(&ip6_tnl_net_ops);
1573}
1574
1575module_init(ip6_tunnel_init);
1576module_exit(ip6_tunnel_cleanup);
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 <linux/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#include <net/dst_metadata.h>
61
62MODULE_AUTHOR("Ville Nuorvala");
63MODULE_DESCRIPTION("IPv6 tunneling device");
64MODULE_LICENSE("GPL");
65MODULE_ALIAS_RTNL_LINK("ip6tnl");
66MODULE_ALIAS_NETDEV("ip6tnl0");
67
68#define IP6_TUNNEL_HASH_SIZE_SHIFT 5
69#define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
70
71static bool log_ecn_error = true;
72module_param(log_ecn_error, bool, 0644);
73MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
74
75static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
76{
77 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
78
79 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
80}
81
82static int ip6_tnl_dev_init(struct net_device *dev);
83static void ip6_tnl_dev_setup(struct net_device *dev);
84static struct rtnl_link_ops ip6_link_ops __read_mostly;
85
86static unsigned int ip6_tnl_net_id __read_mostly;
87struct ip6_tnl_net {
88 /* the IPv6 tunnel fallback device */
89 struct net_device *fb_tnl_dev;
90 /* lists for storing tunnels in use */
91 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
92 struct ip6_tnl __rcu *tnls_wc[1];
93 struct ip6_tnl __rcu **tnls[2];
94 struct ip6_tnl __rcu *collect_md_tun;
95};
96
97static struct net_device_stats *ip6_get_stats(struct net_device *dev)
98{
99 struct pcpu_sw_netstats tmp, sum = { 0 };
100 int i;
101
102 for_each_possible_cpu(i) {
103 unsigned int start;
104 const struct pcpu_sw_netstats *tstats =
105 per_cpu_ptr(dev->tstats, i);
106
107 do {
108 start = u64_stats_fetch_begin_irq(&tstats->syncp);
109 tmp.rx_packets = tstats->rx_packets;
110 tmp.rx_bytes = tstats->rx_bytes;
111 tmp.tx_packets = tstats->tx_packets;
112 tmp.tx_bytes = tstats->tx_bytes;
113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
114
115 sum.rx_packets += tmp.rx_packets;
116 sum.rx_bytes += tmp.rx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.tx_bytes += tmp.tx_bytes;
119 }
120 dev->stats.rx_packets = sum.rx_packets;
121 dev->stats.rx_bytes = sum.rx_bytes;
122 dev->stats.tx_packets = sum.tx_packets;
123 dev->stats.tx_bytes = sum.tx_bytes;
124 return &dev->stats;
125}
126
127/**
128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
129 * @remote: the address of the tunnel exit-point
130 * @local: the address of the tunnel entry-point
131 *
132 * Return:
133 * tunnel matching given end-points if found,
134 * else fallback tunnel if its device is up,
135 * else %NULL
136 **/
137
138#define for_each_ip6_tunnel_rcu(start) \
139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
140
141static struct ip6_tnl *
142ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
143{
144 unsigned int hash = HASH(remote, local);
145 struct ip6_tnl *t;
146 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
147 struct in6_addr any;
148
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (ipv6_addr_equal(local, &t->parms.laddr) &&
151 ipv6_addr_equal(remote, &t->parms.raddr) &&
152 (t->dev->flags & IFF_UP))
153 return t;
154 }
155
156 memset(&any, 0, sizeof(any));
157 hash = HASH(&any, local);
158 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
159 if (ipv6_addr_equal(local, &t->parms.laddr) &&
160 ipv6_addr_any(&t->parms.raddr) &&
161 (t->dev->flags & IFF_UP))
162 return t;
163 }
164
165 hash = HASH(remote, &any);
166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
168 ipv6_addr_any(&t->parms.laddr) &&
169 (t->dev->flags & IFF_UP))
170 return t;
171 }
172
173 t = rcu_dereference(ip6n->collect_md_tun);
174 if (t && t->dev->flags & IFF_UP)
175 return t;
176
177 t = rcu_dereference(ip6n->tnls_wc[0]);
178 if (t && (t->dev->flags & IFF_UP))
179 return t;
180
181 return NULL;
182}
183
184/**
185 * ip6_tnl_bucket - get head of list matching given tunnel parameters
186 * @p: parameters containing tunnel end-points
187 *
188 * Description:
189 * ip6_tnl_bucket() returns the head of the list matching the
190 * &struct in6_addr entries laddr and raddr in @p.
191 *
192 * Return: head of IPv6 tunnel list
193 **/
194
195static struct ip6_tnl __rcu **
196ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
197{
198 const struct in6_addr *remote = &p->raddr;
199 const struct in6_addr *local = &p->laddr;
200 unsigned int h = 0;
201 int prio = 0;
202
203 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
204 prio = 1;
205 h = HASH(remote, local);
206 }
207 return &ip6n->tnls[prio][h];
208}
209
210/**
211 * ip6_tnl_link - add tunnel to hash table
212 * @t: tunnel to be added
213 **/
214
215static void
216ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
217{
218 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
219
220 if (t->parms.collect_md)
221 rcu_assign_pointer(ip6n->collect_md_tun, t);
222 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
223 rcu_assign_pointer(*tp, t);
224}
225
226/**
227 * ip6_tnl_unlink - remove tunnel from hash table
228 * @t: tunnel to be removed
229 **/
230
231static void
232ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
233{
234 struct ip6_tnl __rcu **tp;
235 struct ip6_tnl *iter;
236
237 if (t->parms.collect_md)
238 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
239
240 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
241 (iter = rtnl_dereference(*tp)) != NULL;
242 tp = &iter->next) {
243 if (t == iter) {
244 rcu_assign_pointer(*tp, t->next);
245 break;
246 }
247 }
248}
249
250static void ip6_dev_free(struct net_device *dev)
251{
252 struct ip6_tnl *t = netdev_priv(dev);
253
254 gro_cells_destroy(&t->gro_cells);
255 dst_cache_destroy(&t->dst_cache);
256 free_percpu(dev->tstats);
257}
258
259static int ip6_tnl_create2(struct net_device *dev)
260{
261 struct ip6_tnl *t = netdev_priv(dev);
262 struct net *net = dev_net(dev);
263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
264 int err;
265
266 t = netdev_priv(dev);
267
268 dev->rtnl_link_ops = &ip6_link_ops;
269 err = register_netdevice(dev);
270 if (err < 0)
271 goto out;
272
273 strcpy(t->parms.name, dev->name);
274
275 dev_hold(dev);
276 ip6_tnl_link(ip6n, t);
277 return 0;
278
279out:
280 return err;
281}
282
283/**
284 * ip6_tnl_create - create a new tunnel
285 * @p: tunnel parameters
286 * @pt: pointer to new tunnel
287 *
288 * Description:
289 * Create tunnel matching given parameters.
290 *
291 * Return:
292 * created tunnel or error pointer
293 **/
294
295static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
296{
297 struct net_device *dev;
298 struct ip6_tnl *t;
299 char name[IFNAMSIZ];
300 int err = -E2BIG;
301
302 if (p->name[0]) {
303 if (!dev_valid_name(p->name))
304 goto failed;
305 strlcpy(name, p->name, IFNAMSIZ);
306 } else {
307 sprintf(name, "ip6tnl%%d");
308 }
309 err = -ENOMEM;
310 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
311 ip6_tnl_dev_setup);
312 if (!dev)
313 goto failed;
314
315 dev_net_set(dev, net);
316
317 t = netdev_priv(dev);
318 t->parms = *p;
319 t->net = dev_net(dev);
320 err = ip6_tnl_create2(dev);
321 if (err < 0)
322 goto failed_free;
323
324 return t;
325
326failed_free:
327 free_netdev(dev);
328failed:
329 return ERR_PTR(err);
330}
331
332/**
333 * ip6_tnl_locate - find or create tunnel matching given parameters
334 * @p: tunnel parameters
335 * @create: != 0 if allowed to create new tunnel if no match found
336 *
337 * Description:
338 * ip6_tnl_locate() first tries to locate an existing tunnel
339 * based on @parms. If this is unsuccessful, but @create is set a new
340 * tunnel device is created and registered for use.
341 *
342 * Return:
343 * matching tunnel or error pointer
344 **/
345
346static struct ip6_tnl *ip6_tnl_locate(struct net *net,
347 struct __ip6_tnl_parm *p, int create)
348{
349 const struct in6_addr *remote = &p->raddr;
350 const struct in6_addr *local = &p->laddr;
351 struct ip6_tnl __rcu **tp;
352 struct ip6_tnl *t;
353 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
354
355 for (tp = ip6_tnl_bucket(ip6n, p);
356 (t = rtnl_dereference(*tp)) != NULL;
357 tp = &t->next) {
358 if (ipv6_addr_equal(local, &t->parms.laddr) &&
359 ipv6_addr_equal(remote, &t->parms.raddr)) {
360 if (create)
361 return ERR_PTR(-EEXIST);
362
363 return t;
364 }
365 }
366 if (!create)
367 return ERR_PTR(-ENODEV);
368 return ip6_tnl_create(net, p);
369}
370
371/**
372 * ip6_tnl_dev_uninit - tunnel device uninitializer
373 * @dev: the device to be destroyed
374 *
375 * Description:
376 * ip6_tnl_dev_uninit() removes tunnel from its list
377 **/
378
379static void
380ip6_tnl_dev_uninit(struct net_device *dev)
381{
382 struct ip6_tnl *t = netdev_priv(dev);
383 struct net *net = t->net;
384 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
385
386 if (dev == ip6n->fb_tnl_dev)
387 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
388 else
389 ip6_tnl_unlink(ip6n, t);
390 dst_cache_reset(&t->dst_cache);
391 dev_put(dev);
392}
393
394/**
395 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
396 * @skb: received socket buffer
397 *
398 * Return:
399 * 0 if none was found,
400 * else index to encapsulation limit
401 **/
402
403__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
404{
405 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
406 unsigned int nhoff = raw - skb->data;
407 unsigned int off = nhoff + sizeof(*ipv6h);
408 u8 next, nexthdr = ipv6h->nexthdr;
409
410 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
411 struct ipv6_opt_hdr *hdr;
412 u16 optlen;
413
414 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
415 break;
416
417 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
418 if (nexthdr == NEXTHDR_FRAGMENT) {
419 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
420 if (frag_hdr->frag_off)
421 break;
422 optlen = 8;
423 } else if (nexthdr == NEXTHDR_AUTH) {
424 optlen = (hdr->hdrlen + 2) << 2;
425 } else {
426 optlen = ipv6_optlen(hdr);
427 }
428 /* cache hdr->nexthdr, since pskb_may_pull() might
429 * invalidate hdr
430 */
431 next = hdr->nexthdr;
432 if (nexthdr == NEXTHDR_DEST) {
433 u16 i = 2;
434
435 /* Remember : hdr is no longer valid at this point. */
436 if (!pskb_may_pull(skb, off + optlen))
437 break;
438
439 while (1) {
440 struct ipv6_tlv_tnl_enc_lim *tel;
441
442 /* No more room for encapsulation limit */
443 if (i + sizeof(*tel) > optlen)
444 break;
445
446 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
447 /* return index of option if found and valid */
448 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
449 tel->length == 1)
450 return i + off - nhoff;
451 /* else jump to next option */
452 if (tel->type)
453 i += tel->length + 2;
454 else
455 i++;
456 }
457 }
458 nexthdr = next;
459 off += optlen;
460 }
461 return 0;
462}
463EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
464
465/**
466 * ip6_tnl_err - tunnel error handler
467 *
468 * Description:
469 * ip6_tnl_err() should handle errors in the tunnel according
470 * to the specifications in RFC 2473.
471 **/
472
473static int
474ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
475 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
476{
477 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
478 struct net *net = dev_net(skb->dev);
479 u8 rel_type = ICMPV6_DEST_UNREACH;
480 u8 rel_code = ICMPV6_ADDR_UNREACH;
481 __u32 rel_info = 0;
482 struct ip6_tnl *t;
483 int err = -ENOENT;
484 int rel_msg = 0;
485 u8 tproto;
486 __u16 len;
487
488 /* If the packet doesn't contain the original IPv6 header we are
489 in trouble since we might need the source address for further
490 processing of the error. */
491
492 rcu_read_lock();
493 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
494 if (!t)
495 goto out;
496
497 tproto = READ_ONCE(t->parms.proto);
498 if (tproto != ipproto && tproto != 0)
499 goto out;
500
501 err = 0;
502
503 switch (*type) {
504 struct ipv6_tlv_tnl_enc_lim *tel;
505 __u32 mtu, teli;
506 case ICMPV6_DEST_UNREACH:
507 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
508 t->parms.name);
509 rel_msg = 1;
510 break;
511 case ICMPV6_TIME_EXCEED:
512 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
513 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
514 t->parms.name);
515 rel_msg = 1;
516 }
517 break;
518 case ICMPV6_PARAMPROB:
519 teli = 0;
520 if ((*code) == ICMPV6_HDR_FIELD)
521 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
522
523 if (teli && teli == *info - 2) {
524 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
525 if (tel->encap_limit == 0) {
526 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
527 t->parms.name);
528 rel_msg = 1;
529 }
530 } else {
531 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
532 t->parms.name);
533 }
534 break;
535 case ICMPV6_PKT_TOOBIG:
536 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
537 sock_net_uid(net, NULL));
538 mtu = *info - offset;
539 if (mtu < IPV6_MIN_MTU)
540 mtu = IPV6_MIN_MTU;
541 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
542 if (len > mtu) {
543 rel_type = ICMPV6_PKT_TOOBIG;
544 rel_code = 0;
545 rel_info = mtu;
546 rel_msg = 1;
547 }
548 break;
549 case NDISC_REDIRECT:
550 ip6_redirect(skb, net, skb->dev->ifindex, 0,
551 sock_net_uid(net, NULL));
552 break;
553 }
554
555 *type = rel_type;
556 *code = rel_code;
557 *info = rel_info;
558 *msg = rel_msg;
559
560out:
561 rcu_read_unlock();
562 return err;
563}
564
565static int
566ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
567 u8 type, u8 code, int offset, __be32 info)
568{
569 __u32 rel_info = ntohl(info);
570 const struct iphdr *eiph;
571 struct sk_buff *skb2;
572 int err, rel_msg = 0;
573 u8 rel_type = type;
574 u8 rel_code = code;
575 struct rtable *rt;
576 struct flowi4 fl4;
577
578 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
579 &rel_msg, &rel_info, offset);
580 if (err < 0)
581 return err;
582
583 if (rel_msg == 0)
584 return 0;
585
586 switch (rel_type) {
587 case ICMPV6_DEST_UNREACH:
588 if (rel_code != ICMPV6_ADDR_UNREACH)
589 return 0;
590 rel_type = ICMP_DEST_UNREACH;
591 rel_code = ICMP_HOST_UNREACH;
592 break;
593 case ICMPV6_PKT_TOOBIG:
594 if (rel_code != 0)
595 return 0;
596 rel_type = ICMP_DEST_UNREACH;
597 rel_code = ICMP_FRAG_NEEDED;
598 break;
599 default:
600 return 0;
601 }
602
603 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
604 return 0;
605
606 skb2 = skb_clone(skb, GFP_ATOMIC);
607 if (!skb2)
608 return 0;
609
610 skb_dst_drop(skb2);
611
612 skb_pull(skb2, offset);
613 skb_reset_network_header(skb2);
614 eiph = ip_hdr(skb2);
615
616 /* Try to guess incoming interface */
617 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
618 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
619 if (IS_ERR(rt))
620 goto out;
621
622 skb2->dev = rt->dst.dev;
623 ip_rt_put(rt);
624
625 /* route "incoming" packet */
626 if (rt->rt_flags & RTCF_LOCAL) {
627 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
628 eiph->daddr, eiph->saddr, 0, 0,
629 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
630 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) {
631 if (!IS_ERR(rt))
632 ip_rt_put(rt);
633 goto out;
634 }
635 skb_dst_set(skb2, &rt->dst);
636 } else {
637 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
638 skb2->dev) ||
639 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
640 goto out;
641 }
642
643 /* change mtu on this route */
644 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
645 if (rel_info > dst_mtu(skb_dst(skb2)))
646 goto out;
647
648 skb_dst_update_pmtu(skb2, rel_info);
649 }
650
651 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
652
653out:
654 kfree_skb(skb2);
655 return 0;
656}
657
658static int
659ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
660 u8 type, u8 code, int offset, __be32 info)
661{
662 __u32 rel_info = ntohl(info);
663 int err, rel_msg = 0;
664 u8 rel_type = type;
665 u8 rel_code = code;
666
667 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
668 &rel_msg, &rel_info, offset);
669 if (err < 0)
670 return err;
671
672 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
673 struct rt6_info *rt;
674 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
675
676 if (!skb2)
677 return 0;
678
679 skb_dst_drop(skb2);
680 skb_pull(skb2, offset);
681 skb_reset_network_header(skb2);
682
683 /* Try to guess incoming interface */
684 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
685 NULL, 0, skb2, 0);
686
687 if (rt && rt->dst.dev)
688 skb2->dev = rt->dst.dev;
689
690 icmpv6_send(skb2, rel_type, rel_code, rel_info);
691
692 ip6_rt_put(rt);
693
694 kfree_skb(skb2);
695 }
696
697 return 0;
698}
699
700static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
701 const struct ipv6hdr *ipv6h,
702 struct sk_buff *skb)
703{
704 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
705
706 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
707 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
708
709 return IP6_ECN_decapsulate(ipv6h, skb);
710}
711
712static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
713 const struct ipv6hdr *ipv6h,
714 struct sk_buff *skb)
715{
716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
717 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
718
719 return IP6_ECN_decapsulate(ipv6h, skb);
720}
721
722__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
723 const struct in6_addr *laddr,
724 const struct in6_addr *raddr)
725{
726 struct __ip6_tnl_parm *p = &t->parms;
727 int ltype = ipv6_addr_type(laddr);
728 int rtype = ipv6_addr_type(raddr);
729 __u32 flags = 0;
730
731 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
732 flags = IP6_TNL_F_CAP_PER_PACKET;
733 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
734 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
735 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
736 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
737 if (ltype&IPV6_ADDR_UNICAST)
738 flags |= IP6_TNL_F_CAP_XMIT;
739 if (rtype&IPV6_ADDR_UNICAST)
740 flags |= IP6_TNL_F_CAP_RCV;
741 }
742 return flags;
743}
744EXPORT_SYMBOL(ip6_tnl_get_cap);
745
746/* called with rcu_read_lock() */
747int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
748 const struct in6_addr *laddr,
749 const struct in6_addr *raddr)
750{
751 struct __ip6_tnl_parm *p = &t->parms;
752 int ret = 0;
753 struct net *net = t->net;
754
755 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
756 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
757 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
758 struct net_device *ldev = NULL;
759
760 if (p->link)
761 ldev = dev_get_by_index_rcu(net, p->link);
762
763 if ((ipv6_addr_is_multicast(laddr) ||
764 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
765 0, IFA_F_TENTATIVE))) &&
766 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
767 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
768 0, IFA_F_TENTATIVE))))
769 ret = 1;
770 }
771 return ret;
772}
773EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
774
775static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
776 const struct tnl_ptk_info *tpi,
777 struct metadata_dst *tun_dst,
778 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
779 const struct ipv6hdr *ipv6h,
780 struct sk_buff *skb),
781 bool log_ecn_err)
782{
783 struct pcpu_sw_netstats *tstats;
784 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
785 int err;
786
787 if ((!(tpi->flags & TUNNEL_CSUM) &&
788 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
789 ((tpi->flags & TUNNEL_CSUM) &&
790 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
791 tunnel->dev->stats.rx_crc_errors++;
792 tunnel->dev->stats.rx_errors++;
793 goto drop;
794 }
795
796 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
797 if (!(tpi->flags & TUNNEL_SEQ) ||
798 (tunnel->i_seqno &&
799 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
800 tunnel->dev->stats.rx_fifo_errors++;
801 tunnel->dev->stats.rx_errors++;
802 goto drop;
803 }
804 tunnel->i_seqno = ntohl(tpi->seq) + 1;
805 }
806
807 skb->protocol = tpi->proto;
808
809 /* Warning: All skb pointers will be invalidated! */
810 if (tunnel->dev->type == ARPHRD_ETHER) {
811 if (!pskb_may_pull(skb, ETH_HLEN)) {
812 tunnel->dev->stats.rx_length_errors++;
813 tunnel->dev->stats.rx_errors++;
814 goto drop;
815 }
816
817 ipv6h = ipv6_hdr(skb);
818 skb->protocol = eth_type_trans(skb, tunnel->dev);
819 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
820 } else {
821 skb->dev = tunnel->dev;
822 }
823
824 skb_reset_network_header(skb);
825 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
826
827 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
828
829 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
830 if (unlikely(err)) {
831 if (log_ecn_err)
832 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
833 &ipv6h->saddr,
834 ipv6_get_dsfield(ipv6h));
835 if (err > 1) {
836 ++tunnel->dev->stats.rx_frame_errors;
837 ++tunnel->dev->stats.rx_errors;
838 goto drop;
839 }
840 }
841
842 tstats = this_cpu_ptr(tunnel->dev->tstats);
843 u64_stats_update_begin(&tstats->syncp);
844 tstats->rx_packets++;
845 tstats->rx_bytes += skb->len;
846 u64_stats_update_end(&tstats->syncp);
847
848 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
849
850 if (tun_dst)
851 skb_dst_set(skb, (struct dst_entry *)tun_dst);
852
853 gro_cells_receive(&tunnel->gro_cells, skb);
854 return 0;
855
856drop:
857 if (tun_dst)
858 dst_release((struct dst_entry *)tun_dst);
859 kfree_skb(skb);
860 return 0;
861}
862
863int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
864 const struct tnl_ptk_info *tpi,
865 struct metadata_dst *tun_dst,
866 bool log_ecn_err)
867{
868 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
869 log_ecn_err);
870}
871EXPORT_SYMBOL(ip6_tnl_rcv);
872
873static const struct tnl_ptk_info tpi_v6 = {
874 /* no tunnel info required for ipxip6. */
875 .proto = htons(ETH_P_IPV6),
876};
877
878static const struct tnl_ptk_info tpi_v4 = {
879 /* no tunnel info required for ipxip6. */
880 .proto = htons(ETH_P_IP),
881};
882
883static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
884 const struct tnl_ptk_info *tpi,
885 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
886 const struct ipv6hdr *ipv6h,
887 struct sk_buff *skb))
888{
889 struct ip6_tnl *t;
890 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
891 struct metadata_dst *tun_dst = NULL;
892 int ret = -1;
893
894 rcu_read_lock();
895 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
896
897 if (t) {
898 u8 tproto = READ_ONCE(t->parms.proto);
899
900 if (tproto != ipproto && tproto != 0)
901 goto drop;
902 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
903 goto drop;
904 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
905 goto drop;
906 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
907 goto drop;
908 if (t->parms.collect_md) {
909 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
910 if (!tun_dst)
911 goto drop;
912 }
913 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
914 log_ecn_error);
915 }
916
917 rcu_read_unlock();
918
919 return ret;
920
921drop:
922 rcu_read_unlock();
923 kfree_skb(skb);
924 return 0;
925}
926
927static int ip4ip6_rcv(struct sk_buff *skb)
928{
929 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
930 ip4ip6_dscp_ecn_decapsulate);
931}
932
933static int ip6ip6_rcv(struct sk_buff *skb)
934{
935 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
936 ip6ip6_dscp_ecn_decapsulate);
937}
938
939struct ipv6_tel_txoption {
940 struct ipv6_txoptions ops;
941 __u8 dst_opt[8];
942};
943
944static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
945{
946 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
947
948 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
949 opt->dst_opt[3] = 1;
950 opt->dst_opt[4] = encap_limit;
951 opt->dst_opt[5] = IPV6_TLV_PADN;
952 opt->dst_opt[6] = 1;
953
954 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
955 opt->ops.opt_nflen = 8;
956}
957
958/**
959 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
960 * @t: the outgoing tunnel device
961 * @hdr: IPv6 header from the incoming packet
962 *
963 * Description:
964 * Avoid trivial tunneling loop by checking that tunnel exit-point
965 * doesn't match source of incoming packet.
966 *
967 * Return:
968 * 1 if conflict,
969 * 0 else
970 **/
971
972static inline bool
973ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
974{
975 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
976}
977
978int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
979 const struct in6_addr *laddr,
980 const struct in6_addr *raddr)
981{
982 struct __ip6_tnl_parm *p = &t->parms;
983 int ret = 0;
984 struct net *net = t->net;
985
986 if (t->parms.collect_md)
987 return 1;
988
989 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
990 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
991 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
992 struct net_device *ldev = NULL;
993
994 rcu_read_lock();
995 if (p->link)
996 ldev = dev_get_by_index_rcu(net, p->link);
997
998 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
999 0, IFA_F_TENTATIVE)))
1000 pr_warn("%s xmit: Local address not yet configured!\n",
1001 p->name);
1002 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1003 !ipv6_addr_is_multicast(raddr) &&
1004 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1005 true, 0, IFA_F_TENTATIVE)))
1006 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1007 p->name);
1008 else
1009 ret = 1;
1010 rcu_read_unlock();
1011 }
1012 return ret;
1013}
1014EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1015
1016/**
1017 * ip6_tnl_xmit - encapsulate packet and send
1018 * @skb: the outgoing socket buffer
1019 * @dev: the outgoing tunnel device
1020 * @dsfield: dscp code for outer header
1021 * @fl6: flow of tunneled packet
1022 * @encap_limit: encapsulation limit
1023 * @pmtu: Path MTU is stored if packet is too big
1024 * @proto: next header value
1025 *
1026 * Description:
1027 * Build new header and do some sanity checks on the packet before sending
1028 * it.
1029 *
1030 * Return:
1031 * 0 on success
1032 * -1 fail
1033 * %-EMSGSIZE message too big. return mtu in this case.
1034 **/
1035
1036int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1037 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1038 __u8 proto)
1039{
1040 struct ip6_tnl *t = netdev_priv(dev);
1041 struct net *net = t->net;
1042 struct net_device_stats *stats = &t->dev->stats;
1043 struct ipv6hdr *ipv6h;
1044 struct ipv6_tel_txoption opt;
1045 struct dst_entry *dst = NULL, *ndst = NULL;
1046 struct net_device *tdev;
1047 int mtu;
1048 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1049 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1050 unsigned int max_headroom = psh_hlen;
1051 bool use_cache = false;
1052 u8 hop_limit;
1053 int err = -1;
1054
1055 if (t->parms.collect_md) {
1056 hop_limit = skb_tunnel_info(skb)->key.ttl;
1057 goto route_lookup;
1058 } else {
1059 hop_limit = t->parms.hop_limit;
1060 }
1061
1062 /* NBMA tunnel */
1063 if (ipv6_addr_any(&t->parms.raddr)) {
1064 if (skb->protocol == htons(ETH_P_IPV6)) {
1065 struct in6_addr *addr6;
1066 struct neighbour *neigh;
1067 int addr_type;
1068
1069 if (!skb_dst(skb))
1070 goto tx_err_link_failure;
1071
1072 neigh = dst_neigh_lookup(skb_dst(skb),
1073 &ipv6_hdr(skb)->daddr);
1074 if (!neigh)
1075 goto tx_err_link_failure;
1076
1077 addr6 = (struct in6_addr *)&neigh->primary_key;
1078 addr_type = ipv6_addr_type(addr6);
1079
1080 if (addr_type == IPV6_ADDR_ANY)
1081 addr6 = &ipv6_hdr(skb)->daddr;
1082
1083 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1084 neigh_release(neigh);
1085 }
1086 } else if (t->parms.proto != 0 && !(t->parms.flags &
1087 (IP6_TNL_F_USE_ORIG_TCLASS |
1088 IP6_TNL_F_USE_ORIG_FWMARK))) {
1089 /* enable the cache only if neither the outer protocol nor the
1090 * routing decision depends on the current inner header value
1091 */
1092 use_cache = true;
1093 }
1094
1095 if (use_cache)
1096 dst = dst_cache_get(&t->dst_cache);
1097
1098 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1099 goto tx_err_link_failure;
1100
1101 if (!dst) {
1102route_lookup:
1103 /* add dsfield to flowlabel for route lookup */
1104 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1105
1106 dst = ip6_route_output(net, NULL, fl6);
1107
1108 if (dst->error)
1109 goto tx_err_link_failure;
1110 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1111 if (IS_ERR(dst)) {
1112 err = PTR_ERR(dst);
1113 dst = NULL;
1114 goto tx_err_link_failure;
1115 }
1116 if (t->parms.collect_md &&
1117 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1118 &fl6->daddr, 0, &fl6->saddr))
1119 goto tx_err_link_failure;
1120 ndst = dst;
1121 }
1122
1123 tdev = dst->dev;
1124
1125 if (tdev == dev) {
1126 stats->collisions++;
1127 net_warn_ratelimited("%s: Local routing loop detected!\n",
1128 t->parms.name);
1129 goto tx_err_dst_release;
1130 }
1131 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1132 if (encap_limit >= 0) {
1133 max_headroom += 8;
1134 mtu -= 8;
1135 }
1136 if (skb->protocol == htons(ETH_P_IPV6)) {
1137 if (mtu < IPV6_MIN_MTU)
1138 mtu = IPV6_MIN_MTU;
1139 } else if (mtu < 576) {
1140 mtu = 576;
1141 }
1142
1143 skb_dst_update_pmtu(skb, mtu);
1144 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1145 *pmtu = mtu;
1146 err = -EMSGSIZE;
1147 goto tx_err_dst_release;
1148 }
1149
1150 if (t->err_count > 0) {
1151 if (time_before(jiffies,
1152 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1153 t->err_count--;
1154
1155 dst_link_failure(skb);
1156 } else {
1157 t->err_count = 0;
1158 }
1159 }
1160
1161 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1162
1163 /*
1164 * Okay, now see if we can stuff it in the buffer as-is.
1165 */
1166 max_headroom += LL_RESERVED_SPACE(tdev);
1167
1168 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1169 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1170 struct sk_buff *new_skb;
1171
1172 new_skb = skb_realloc_headroom(skb, max_headroom);
1173 if (!new_skb)
1174 goto tx_err_dst_release;
1175
1176 if (skb->sk)
1177 skb_set_owner_w(new_skb, skb->sk);
1178 consume_skb(skb);
1179 skb = new_skb;
1180 }
1181
1182 if (t->parms.collect_md) {
1183 if (t->encap.type != TUNNEL_ENCAP_NONE)
1184 goto tx_err_dst_release;
1185 } else {
1186 if (use_cache && ndst)
1187 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1188 }
1189 skb_dst_set(skb, dst);
1190
1191 if (encap_limit >= 0) {
1192 init_tel_txopt(&opt, encap_limit);
1193 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1194 }
1195 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst);
1196
1197 /* Calculate max headroom for all the headers and adjust
1198 * needed_headroom if necessary.
1199 */
1200 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1201 + dst->header_len + t->hlen;
1202 if (max_headroom > dev->needed_headroom)
1203 dev->needed_headroom = max_headroom;
1204
1205 err = ip6_tnl_encap(skb, t, &proto, fl6);
1206 if (err)
1207 return err;
1208
1209 skb_push(skb, sizeof(struct ipv6hdr));
1210 skb_reset_network_header(skb);
1211 ipv6h = ipv6_hdr(skb);
1212 ip6_flow_hdr(ipv6h, dsfield,
1213 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1214 ipv6h->hop_limit = hop_limit;
1215 ipv6h->nexthdr = proto;
1216 ipv6h->saddr = fl6->saddr;
1217 ipv6h->daddr = fl6->daddr;
1218 ip6tunnel_xmit(NULL, skb, dev);
1219 return 0;
1220tx_err_link_failure:
1221 stats->tx_carrier_errors++;
1222 dst_link_failure(skb);
1223tx_err_dst_release:
1224 dst_release(dst);
1225 return err;
1226}
1227EXPORT_SYMBOL(ip6_tnl_xmit);
1228
1229static inline int
1230ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1231{
1232 struct ip6_tnl *t = netdev_priv(dev);
1233 const struct iphdr *iph = ip_hdr(skb);
1234 int encap_limit = -1;
1235 struct flowi6 fl6;
1236 __u8 dsfield;
1237 __u32 mtu;
1238 u8 tproto;
1239 int err;
1240
1241 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1242
1243 tproto = READ_ONCE(t->parms.proto);
1244 if (tproto != IPPROTO_IPIP && tproto != 0)
1245 return -1;
1246
1247 if (t->parms.collect_md) {
1248 struct ip_tunnel_info *tun_info;
1249 const struct ip_tunnel_key *key;
1250
1251 tun_info = skb_tunnel_info(skb);
1252 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1253 ip_tunnel_info_af(tun_info) != AF_INET6))
1254 return -1;
1255 key = &tun_info->key;
1256 memset(&fl6, 0, sizeof(fl6));
1257 fl6.flowi6_proto = IPPROTO_IPIP;
1258 fl6.daddr = key->u.ipv6.dst;
1259 fl6.flowlabel = key->label;
1260 dsfield = key->tos;
1261 } else {
1262 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1263 encap_limit = t->parms.encap_limit;
1264
1265 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1266 fl6.flowi6_proto = IPPROTO_IPIP;
1267
1268 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1269 dsfield = ipv4_get_dsfield(iph);
1270 else
1271 dsfield = ip6_tclass(t->parms.flowinfo);
1272 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1273 fl6.flowi6_mark = skb->mark;
1274 else
1275 fl6.flowi6_mark = t->parms.fwmark;
1276 }
1277
1278 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1279
1280 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1281 return -1;
1282
1283 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1284
1285 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1286
1287 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1288 IPPROTO_IPIP);
1289 if (err != 0) {
1290 /* XXX: send ICMP error even if DF is not set. */
1291 if (err == -EMSGSIZE)
1292 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1293 htonl(mtu));
1294 return -1;
1295 }
1296
1297 return 0;
1298}
1299
1300static inline int
1301ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1302{
1303 struct ip6_tnl *t = netdev_priv(dev);
1304 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1305 int encap_limit = -1;
1306 __u16 offset;
1307 struct flowi6 fl6;
1308 __u8 dsfield;
1309 __u32 mtu;
1310 u8 tproto;
1311 int err;
1312
1313 tproto = READ_ONCE(t->parms.proto);
1314 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1315 ip6_tnl_addr_conflict(t, ipv6h))
1316 return -1;
1317
1318 if (t->parms.collect_md) {
1319 struct ip_tunnel_info *tun_info;
1320 const struct ip_tunnel_key *key;
1321
1322 tun_info = skb_tunnel_info(skb);
1323 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1324 ip_tunnel_info_af(tun_info) != AF_INET6))
1325 return -1;
1326 key = &tun_info->key;
1327 memset(&fl6, 0, sizeof(fl6));
1328 fl6.flowi6_proto = IPPROTO_IPV6;
1329 fl6.daddr = key->u.ipv6.dst;
1330 fl6.flowlabel = key->label;
1331 dsfield = key->tos;
1332 } else {
1333 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1334 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1335 ipv6h = ipv6_hdr(skb);
1336 if (offset > 0) {
1337 struct ipv6_tlv_tnl_enc_lim *tel;
1338
1339 tel = (void *)&skb_network_header(skb)[offset];
1340 if (tel->encap_limit == 0) {
1341 icmpv6_send(skb, ICMPV6_PARAMPROB,
1342 ICMPV6_HDR_FIELD, offset + 2);
1343 return -1;
1344 }
1345 encap_limit = tel->encap_limit - 1;
1346 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1347 encap_limit = t->parms.encap_limit;
1348 }
1349
1350 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1351 fl6.flowi6_proto = IPPROTO_IPV6;
1352
1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1354 dsfield = ipv6_get_dsfield(ipv6h);
1355 else
1356 dsfield = ip6_tclass(t->parms.flowinfo);
1357 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1358 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1359 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1360 fl6.flowi6_mark = skb->mark;
1361 else
1362 fl6.flowi6_mark = t->parms.fwmark;
1363 }
1364
1365 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1366
1367 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1368 return -1;
1369
1370 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1371
1372 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1373
1374 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1375 IPPROTO_IPV6);
1376 if (err != 0) {
1377 if (err == -EMSGSIZE)
1378 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1379 return -1;
1380 }
1381
1382 return 0;
1383}
1384
1385static netdev_tx_t
1386ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1387{
1388 struct ip6_tnl *t = netdev_priv(dev);
1389 struct net_device_stats *stats = &t->dev->stats;
1390 int ret;
1391
1392 switch (skb->protocol) {
1393 case htons(ETH_P_IP):
1394 ret = ip4ip6_tnl_xmit(skb, dev);
1395 break;
1396 case htons(ETH_P_IPV6):
1397 ret = ip6ip6_tnl_xmit(skb, dev);
1398 break;
1399 default:
1400 goto tx_err;
1401 }
1402
1403 if (ret < 0)
1404 goto tx_err;
1405
1406 return NETDEV_TX_OK;
1407
1408tx_err:
1409 stats->tx_errors++;
1410 stats->tx_dropped++;
1411 kfree_skb(skb);
1412 return NETDEV_TX_OK;
1413}
1414
1415static void ip6_tnl_link_config(struct ip6_tnl *t)
1416{
1417 struct net_device *dev = t->dev;
1418 struct __ip6_tnl_parm *p = &t->parms;
1419 struct flowi6 *fl6 = &t->fl.u.ip6;
1420 int t_hlen;
1421
1422 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1423 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1424
1425 /* Set up flowi template */
1426 fl6->saddr = p->laddr;
1427 fl6->daddr = p->raddr;
1428 fl6->flowi6_oif = p->link;
1429 fl6->flowlabel = 0;
1430
1431 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1432 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1433 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1434 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1435
1436 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1437 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1438
1439 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1440 dev->flags |= IFF_POINTOPOINT;
1441 else
1442 dev->flags &= ~IFF_POINTOPOINT;
1443
1444 t->tun_hlen = 0;
1445 t->hlen = t->encap_hlen + t->tun_hlen;
1446 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1447
1448 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1449 int strict = (ipv6_addr_type(&p->raddr) &
1450 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1451
1452 struct rt6_info *rt = rt6_lookup(t->net,
1453 &p->raddr, &p->laddr,
1454 p->link, NULL, strict);
1455
1456 if (!rt)
1457 return;
1458
1459 if (rt->dst.dev) {
1460 dev->hard_header_len = rt->dst.dev->hard_header_len +
1461 t_hlen;
1462
1463 dev->mtu = rt->dst.dev->mtu - t_hlen;
1464 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1465 dev->mtu -= 8;
1466
1467 if (dev->mtu < IPV6_MIN_MTU)
1468 dev->mtu = IPV6_MIN_MTU;
1469 }
1470 ip6_rt_put(rt);
1471 }
1472}
1473
1474/**
1475 * ip6_tnl_change - update the tunnel parameters
1476 * @t: tunnel to be changed
1477 * @p: tunnel configuration parameters
1478 *
1479 * Description:
1480 * ip6_tnl_change() updates the tunnel parameters
1481 **/
1482
1483static int
1484ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1485{
1486 t->parms.laddr = p->laddr;
1487 t->parms.raddr = p->raddr;
1488 t->parms.flags = p->flags;
1489 t->parms.hop_limit = p->hop_limit;
1490 t->parms.encap_limit = p->encap_limit;
1491 t->parms.flowinfo = p->flowinfo;
1492 t->parms.link = p->link;
1493 t->parms.proto = p->proto;
1494 t->parms.fwmark = p->fwmark;
1495 dst_cache_reset(&t->dst_cache);
1496 ip6_tnl_link_config(t);
1497 return 0;
1498}
1499
1500static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1501{
1502 struct net *net = t->net;
1503 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1504 int err;
1505
1506 ip6_tnl_unlink(ip6n, t);
1507 synchronize_net();
1508 err = ip6_tnl_change(t, p);
1509 ip6_tnl_link(ip6n, t);
1510 netdev_state_change(t->dev);
1511 return err;
1512}
1513
1514static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1515{
1516 /* for default tnl0 device allow to change only the proto */
1517 t->parms.proto = p->proto;
1518 netdev_state_change(t->dev);
1519 return 0;
1520}
1521
1522static void
1523ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1524{
1525 p->laddr = u->laddr;
1526 p->raddr = u->raddr;
1527 p->flags = u->flags;
1528 p->hop_limit = u->hop_limit;
1529 p->encap_limit = u->encap_limit;
1530 p->flowinfo = u->flowinfo;
1531 p->link = u->link;
1532 p->proto = u->proto;
1533 memcpy(p->name, u->name, sizeof(u->name));
1534}
1535
1536static void
1537ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1538{
1539 u->laddr = p->laddr;
1540 u->raddr = p->raddr;
1541 u->flags = p->flags;
1542 u->hop_limit = p->hop_limit;
1543 u->encap_limit = p->encap_limit;
1544 u->flowinfo = p->flowinfo;
1545 u->link = p->link;
1546 u->proto = p->proto;
1547 memcpy(u->name, p->name, sizeof(u->name));
1548}
1549
1550/**
1551 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1552 * @dev: virtual device associated with tunnel
1553 * @ifr: parameters passed from userspace
1554 * @cmd: command to be performed
1555 *
1556 * Description:
1557 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1558 * from userspace.
1559 *
1560 * The possible commands are the following:
1561 * %SIOCGETTUNNEL: get tunnel parameters for device
1562 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1563 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1564 * %SIOCDELTUNNEL: delete tunnel
1565 *
1566 * The fallback device "ip6tnl0", created during module
1567 * initialization, can be used for creating other tunnel devices.
1568 *
1569 * Return:
1570 * 0 on success,
1571 * %-EFAULT if unable to copy data to or from userspace,
1572 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1573 * %-EINVAL if passed tunnel parameters are invalid,
1574 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1575 * %-ENODEV if attempting to change or delete a nonexisting device
1576 **/
1577
1578static int
1579ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1580{
1581 int err = 0;
1582 struct ip6_tnl_parm p;
1583 struct __ip6_tnl_parm p1;
1584 struct ip6_tnl *t = netdev_priv(dev);
1585 struct net *net = t->net;
1586 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1587
1588 memset(&p1, 0, sizeof(p1));
1589
1590 switch (cmd) {
1591 case SIOCGETTUNNEL:
1592 if (dev == ip6n->fb_tnl_dev) {
1593 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1594 err = -EFAULT;
1595 break;
1596 }
1597 ip6_tnl_parm_from_user(&p1, &p);
1598 t = ip6_tnl_locate(net, &p1, 0);
1599 if (IS_ERR(t))
1600 t = netdev_priv(dev);
1601 } else {
1602 memset(&p, 0, sizeof(p));
1603 }
1604 ip6_tnl_parm_to_user(&p, &t->parms);
1605 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1606 err = -EFAULT;
1607 }
1608 break;
1609 case SIOCADDTUNNEL:
1610 case SIOCCHGTUNNEL:
1611 err = -EPERM;
1612 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1613 break;
1614 err = -EFAULT;
1615 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1616 break;
1617 err = -EINVAL;
1618 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1619 p.proto != 0)
1620 break;
1621 ip6_tnl_parm_from_user(&p1, &p);
1622 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1623 if (cmd == SIOCCHGTUNNEL) {
1624 if (!IS_ERR(t)) {
1625 if (t->dev != dev) {
1626 err = -EEXIST;
1627 break;
1628 }
1629 } else
1630 t = netdev_priv(dev);
1631 if (dev == ip6n->fb_tnl_dev)
1632 err = ip6_tnl0_update(t, &p1);
1633 else
1634 err = ip6_tnl_update(t, &p1);
1635 }
1636 if (!IS_ERR(t)) {
1637 err = 0;
1638 ip6_tnl_parm_to_user(&p, &t->parms);
1639 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1640 err = -EFAULT;
1641
1642 } else {
1643 err = PTR_ERR(t);
1644 }
1645 break;
1646 case SIOCDELTUNNEL:
1647 err = -EPERM;
1648 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1649 break;
1650
1651 if (dev == ip6n->fb_tnl_dev) {
1652 err = -EFAULT;
1653 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1654 break;
1655 err = -ENOENT;
1656 ip6_tnl_parm_from_user(&p1, &p);
1657 t = ip6_tnl_locate(net, &p1, 0);
1658 if (IS_ERR(t))
1659 break;
1660 err = -EPERM;
1661 if (t->dev == ip6n->fb_tnl_dev)
1662 break;
1663 dev = t->dev;
1664 }
1665 err = 0;
1666 unregister_netdevice(dev);
1667 break;
1668 default:
1669 err = -EINVAL;
1670 }
1671 return err;
1672}
1673
1674/**
1675 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1676 * @dev: virtual device associated with tunnel
1677 * @new_mtu: the new mtu
1678 *
1679 * Return:
1680 * 0 on success,
1681 * %-EINVAL if mtu too small
1682 **/
1683
1684int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1685{
1686 struct ip6_tnl *tnl = netdev_priv(dev);
1687
1688 if (tnl->parms.proto == IPPROTO_IPV6) {
1689 if (new_mtu < IPV6_MIN_MTU)
1690 return -EINVAL;
1691 } else {
1692 if (new_mtu < ETH_MIN_MTU)
1693 return -EINVAL;
1694 }
1695 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1696 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1697 return -EINVAL;
1698 } else {
1699 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1700 return -EINVAL;
1701 }
1702 dev->mtu = new_mtu;
1703 return 0;
1704}
1705EXPORT_SYMBOL(ip6_tnl_change_mtu);
1706
1707int ip6_tnl_get_iflink(const struct net_device *dev)
1708{
1709 struct ip6_tnl *t = netdev_priv(dev);
1710
1711 return t->parms.link;
1712}
1713EXPORT_SYMBOL(ip6_tnl_get_iflink);
1714
1715int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1716 unsigned int num)
1717{
1718 if (num >= MAX_IPTUN_ENCAP_OPS)
1719 return -ERANGE;
1720
1721 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1722 &ip6tun_encaps[num],
1723 NULL, ops) ? 0 : -1;
1724}
1725EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1726
1727int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1728 unsigned int num)
1729{
1730 int ret;
1731
1732 if (num >= MAX_IPTUN_ENCAP_OPS)
1733 return -ERANGE;
1734
1735 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1736 &ip6tun_encaps[num],
1737 ops, NULL) == ops) ? 0 : -1;
1738
1739 synchronize_net();
1740
1741 return ret;
1742}
1743EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1744
1745int ip6_tnl_encap_setup(struct ip6_tnl *t,
1746 struct ip_tunnel_encap *ipencap)
1747{
1748 int hlen;
1749
1750 memset(&t->encap, 0, sizeof(t->encap));
1751
1752 hlen = ip6_encap_hlen(ipencap);
1753 if (hlen < 0)
1754 return hlen;
1755
1756 t->encap.type = ipencap->type;
1757 t->encap.sport = ipencap->sport;
1758 t->encap.dport = ipencap->dport;
1759 t->encap.flags = ipencap->flags;
1760
1761 t->encap_hlen = hlen;
1762 t->hlen = t->encap_hlen + t->tun_hlen;
1763
1764 return 0;
1765}
1766EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1767
1768static const struct net_device_ops ip6_tnl_netdev_ops = {
1769 .ndo_init = ip6_tnl_dev_init,
1770 .ndo_uninit = ip6_tnl_dev_uninit,
1771 .ndo_start_xmit = ip6_tnl_start_xmit,
1772 .ndo_do_ioctl = ip6_tnl_ioctl,
1773 .ndo_change_mtu = ip6_tnl_change_mtu,
1774 .ndo_get_stats = ip6_get_stats,
1775 .ndo_get_iflink = ip6_tnl_get_iflink,
1776};
1777
1778#define IPXIPX_FEATURES (NETIF_F_SG | \
1779 NETIF_F_FRAGLIST | \
1780 NETIF_F_HIGHDMA | \
1781 NETIF_F_GSO_SOFTWARE | \
1782 NETIF_F_HW_CSUM)
1783
1784/**
1785 * ip6_tnl_dev_setup - setup virtual tunnel device
1786 * @dev: virtual device associated with tunnel
1787 *
1788 * Description:
1789 * Initialize function pointers and device parameters
1790 **/
1791
1792static void ip6_tnl_dev_setup(struct net_device *dev)
1793{
1794 dev->netdev_ops = &ip6_tnl_netdev_ops;
1795 dev->needs_free_netdev = true;
1796 dev->priv_destructor = ip6_dev_free;
1797
1798 dev->type = ARPHRD_TUNNEL6;
1799 dev->flags |= IFF_NOARP;
1800 dev->addr_len = sizeof(struct in6_addr);
1801 dev->features |= NETIF_F_LLTX;
1802 netif_keep_dst(dev);
1803
1804 dev->features |= IPXIPX_FEATURES;
1805 dev->hw_features |= IPXIPX_FEATURES;
1806
1807 /* This perm addr will be used as interface identifier by IPv6 */
1808 dev->addr_assign_type = NET_ADDR_RANDOM;
1809 eth_random_addr(dev->perm_addr);
1810}
1811
1812
1813/**
1814 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1815 * @dev: virtual device associated with tunnel
1816 **/
1817
1818static inline int
1819ip6_tnl_dev_init_gen(struct net_device *dev)
1820{
1821 struct ip6_tnl *t = netdev_priv(dev);
1822 int ret;
1823 int t_hlen;
1824
1825 t->dev = dev;
1826 t->net = dev_net(dev);
1827 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1828 if (!dev->tstats)
1829 return -ENOMEM;
1830
1831 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1832 if (ret)
1833 goto free_stats;
1834
1835 ret = gro_cells_init(&t->gro_cells, dev);
1836 if (ret)
1837 goto destroy_dst;
1838
1839 t->tun_hlen = 0;
1840 t->hlen = t->encap_hlen + t->tun_hlen;
1841 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1842
1843 dev->type = ARPHRD_TUNNEL6;
1844 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1845 dev->mtu = ETH_DATA_LEN - t_hlen;
1846 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1847 dev->mtu -= 8;
1848 dev->min_mtu = ETH_MIN_MTU;
1849 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1850
1851 return 0;
1852
1853destroy_dst:
1854 dst_cache_destroy(&t->dst_cache);
1855free_stats:
1856 free_percpu(dev->tstats);
1857 dev->tstats = NULL;
1858
1859 return ret;
1860}
1861
1862/**
1863 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1864 * @dev: virtual device associated with tunnel
1865 **/
1866
1867static int ip6_tnl_dev_init(struct net_device *dev)
1868{
1869 struct ip6_tnl *t = netdev_priv(dev);
1870 int err = ip6_tnl_dev_init_gen(dev);
1871
1872 if (err)
1873 return err;
1874 ip6_tnl_link_config(t);
1875 if (t->parms.collect_md) {
1876 dev->features |= NETIF_F_NETNS_LOCAL;
1877 netif_keep_dst(dev);
1878 }
1879 return 0;
1880}
1881
1882/**
1883 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1884 * @dev: fallback device
1885 *
1886 * Return: 0
1887 **/
1888
1889static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1890{
1891 struct ip6_tnl *t = netdev_priv(dev);
1892 struct net *net = dev_net(dev);
1893 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1894
1895 t->parms.proto = IPPROTO_IPV6;
1896 dev_hold(dev);
1897
1898 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1899 return 0;
1900}
1901
1902static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1903 struct netlink_ext_ack *extack)
1904{
1905 u8 proto;
1906
1907 if (!data || !data[IFLA_IPTUN_PROTO])
1908 return 0;
1909
1910 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1911 if (proto != IPPROTO_IPV6 &&
1912 proto != IPPROTO_IPIP &&
1913 proto != 0)
1914 return -EINVAL;
1915
1916 return 0;
1917}
1918
1919static void ip6_tnl_netlink_parms(struct nlattr *data[],
1920 struct __ip6_tnl_parm *parms)
1921{
1922 memset(parms, 0, sizeof(*parms));
1923
1924 if (!data)
1925 return;
1926
1927 if (data[IFLA_IPTUN_LINK])
1928 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1929
1930 if (data[IFLA_IPTUN_LOCAL])
1931 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1932
1933 if (data[IFLA_IPTUN_REMOTE])
1934 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1935
1936 if (data[IFLA_IPTUN_TTL])
1937 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1938
1939 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1940 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1941
1942 if (data[IFLA_IPTUN_FLOWINFO])
1943 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1944
1945 if (data[IFLA_IPTUN_FLAGS])
1946 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1947
1948 if (data[IFLA_IPTUN_PROTO])
1949 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1950
1951 if (data[IFLA_IPTUN_COLLECT_METADATA])
1952 parms->collect_md = true;
1953
1954 if (data[IFLA_IPTUN_FWMARK])
1955 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1956}
1957
1958static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1959 struct ip_tunnel_encap *ipencap)
1960{
1961 bool ret = false;
1962
1963 memset(ipencap, 0, sizeof(*ipencap));
1964
1965 if (!data)
1966 return ret;
1967
1968 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1969 ret = true;
1970 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1971 }
1972
1973 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1974 ret = true;
1975 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1976 }
1977
1978 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1979 ret = true;
1980 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1981 }
1982
1983 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1984 ret = true;
1985 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1986 }
1987
1988 return ret;
1989}
1990
1991static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1992 struct nlattr *tb[], struct nlattr *data[],
1993 struct netlink_ext_ack *extack)
1994{
1995 struct net *net = dev_net(dev);
1996 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1997 struct ip_tunnel_encap ipencap;
1998 struct ip6_tnl *nt, *t;
1999 int err;
2000
2001 nt = netdev_priv(dev);
2002
2003 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2004 err = ip6_tnl_encap_setup(nt, &ipencap);
2005 if (err < 0)
2006 return err;
2007 }
2008
2009 ip6_tnl_netlink_parms(data, &nt->parms);
2010
2011 if (nt->parms.collect_md) {
2012 if (rtnl_dereference(ip6n->collect_md_tun))
2013 return -EEXIST;
2014 } else {
2015 t = ip6_tnl_locate(net, &nt->parms, 0);
2016 if (!IS_ERR(t))
2017 return -EEXIST;
2018 }
2019
2020 err = ip6_tnl_create2(dev);
2021 if (!err && tb[IFLA_MTU])
2022 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2023
2024 return err;
2025}
2026
2027static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2028 struct nlattr *data[],
2029 struct netlink_ext_ack *extack)
2030{
2031 struct ip6_tnl *t = netdev_priv(dev);
2032 struct __ip6_tnl_parm p;
2033 struct net *net = t->net;
2034 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2035 struct ip_tunnel_encap ipencap;
2036
2037 if (dev == ip6n->fb_tnl_dev)
2038 return -EINVAL;
2039
2040 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2041 int err = ip6_tnl_encap_setup(t, &ipencap);
2042
2043 if (err < 0)
2044 return err;
2045 }
2046 ip6_tnl_netlink_parms(data, &p);
2047 if (p.collect_md)
2048 return -EINVAL;
2049
2050 t = ip6_tnl_locate(net, &p, 0);
2051 if (!IS_ERR(t)) {
2052 if (t->dev != dev)
2053 return -EEXIST;
2054 } else
2055 t = netdev_priv(dev);
2056
2057 return ip6_tnl_update(t, &p);
2058}
2059
2060static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2061{
2062 struct net *net = dev_net(dev);
2063 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2064
2065 if (dev != ip6n->fb_tnl_dev)
2066 unregister_netdevice_queue(dev, head);
2067}
2068
2069static size_t ip6_tnl_get_size(const struct net_device *dev)
2070{
2071 return
2072 /* IFLA_IPTUN_LINK */
2073 nla_total_size(4) +
2074 /* IFLA_IPTUN_LOCAL */
2075 nla_total_size(sizeof(struct in6_addr)) +
2076 /* IFLA_IPTUN_REMOTE */
2077 nla_total_size(sizeof(struct in6_addr)) +
2078 /* IFLA_IPTUN_TTL */
2079 nla_total_size(1) +
2080 /* IFLA_IPTUN_ENCAP_LIMIT */
2081 nla_total_size(1) +
2082 /* IFLA_IPTUN_FLOWINFO */
2083 nla_total_size(4) +
2084 /* IFLA_IPTUN_FLAGS */
2085 nla_total_size(4) +
2086 /* IFLA_IPTUN_PROTO */
2087 nla_total_size(1) +
2088 /* IFLA_IPTUN_ENCAP_TYPE */
2089 nla_total_size(2) +
2090 /* IFLA_IPTUN_ENCAP_FLAGS */
2091 nla_total_size(2) +
2092 /* IFLA_IPTUN_ENCAP_SPORT */
2093 nla_total_size(2) +
2094 /* IFLA_IPTUN_ENCAP_DPORT */
2095 nla_total_size(2) +
2096 /* IFLA_IPTUN_COLLECT_METADATA */
2097 nla_total_size(0) +
2098 /* IFLA_IPTUN_FWMARK */
2099 nla_total_size(4) +
2100 0;
2101}
2102
2103static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2104{
2105 struct ip6_tnl *tunnel = netdev_priv(dev);
2106 struct __ip6_tnl_parm *parm = &tunnel->parms;
2107
2108 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2109 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2110 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2111 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2112 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2113 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2114 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2115 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2116 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2117 goto nla_put_failure;
2118
2119 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2120 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2121 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2122 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2123 goto nla_put_failure;
2124
2125 if (parm->collect_md)
2126 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2127 goto nla_put_failure;
2128
2129 return 0;
2130
2131nla_put_failure:
2132 return -EMSGSIZE;
2133}
2134
2135struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2136{
2137 struct ip6_tnl *tunnel = netdev_priv(dev);
2138
2139 return tunnel->net;
2140}
2141EXPORT_SYMBOL(ip6_tnl_get_link_net);
2142
2143static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2144 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2145 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2146 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2147 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2148 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2149 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2150 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2151 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2152 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2153 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2154 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2155 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2156 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2157 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2158};
2159
2160static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2161 .kind = "ip6tnl",
2162 .maxtype = IFLA_IPTUN_MAX,
2163 .policy = ip6_tnl_policy,
2164 .priv_size = sizeof(struct ip6_tnl),
2165 .setup = ip6_tnl_dev_setup,
2166 .validate = ip6_tnl_validate,
2167 .newlink = ip6_tnl_newlink,
2168 .changelink = ip6_tnl_changelink,
2169 .dellink = ip6_tnl_dellink,
2170 .get_size = ip6_tnl_get_size,
2171 .fill_info = ip6_tnl_fill_info,
2172 .get_link_net = ip6_tnl_get_link_net,
2173};
2174
2175static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2176 .handler = ip4ip6_rcv,
2177 .err_handler = ip4ip6_err,
2178 .priority = 1,
2179};
2180
2181static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2182 .handler = ip6ip6_rcv,
2183 .err_handler = ip6ip6_err,
2184 .priority = 1,
2185};
2186
2187static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2188{
2189 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2190 struct net_device *dev, *aux;
2191 int h;
2192 struct ip6_tnl *t;
2193
2194 for_each_netdev_safe(net, dev, aux)
2195 if (dev->rtnl_link_ops == &ip6_link_ops)
2196 unregister_netdevice_queue(dev, list);
2197
2198 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2199 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2200 while (t) {
2201 /* If dev is in the same netns, it has already
2202 * been added to the list by the previous loop.
2203 */
2204 if (!net_eq(dev_net(t->dev), net))
2205 unregister_netdevice_queue(t->dev, list);
2206 t = rtnl_dereference(t->next);
2207 }
2208 }
2209}
2210
2211static int __net_init ip6_tnl_init_net(struct net *net)
2212{
2213 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2214 struct ip6_tnl *t = NULL;
2215 int err;
2216
2217 ip6n->tnls[0] = ip6n->tnls_wc;
2218 ip6n->tnls[1] = ip6n->tnls_r_l;
2219
2220 if (!net_has_fallback_tunnels(net))
2221 return 0;
2222 err = -ENOMEM;
2223 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2224 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2225
2226 if (!ip6n->fb_tnl_dev)
2227 goto err_alloc_dev;
2228 dev_net_set(ip6n->fb_tnl_dev, net);
2229 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2230 /* FB netdevice is special: we have one, and only one per netns.
2231 * Allowing to move it to another netns is clearly unsafe.
2232 */
2233 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2234
2235 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2236 if (err < 0)
2237 goto err_register;
2238
2239 err = register_netdev(ip6n->fb_tnl_dev);
2240 if (err < 0)
2241 goto err_register;
2242
2243 t = netdev_priv(ip6n->fb_tnl_dev);
2244
2245 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2246 return 0;
2247
2248err_register:
2249 free_netdev(ip6n->fb_tnl_dev);
2250err_alloc_dev:
2251 return err;
2252}
2253
2254static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2255{
2256 struct net *net;
2257 LIST_HEAD(list);
2258
2259 rtnl_lock();
2260 list_for_each_entry(net, net_list, exit_list)
2261 ip6_tnl_destroy_tunnels(net, &list);
2262 unregister_netdevice_many(&list);
2263 rtnl_unlock();
2264}
2265
2266static struct pernet_operations ip6_tnl_net_ops = {
2267 .init = ip6_tnl_init_net,
2268 .exit_batch = ip6_tnl_exit_batch_net,
2269 .id = &ip6_tnl_net_id,
2270 .size = sizeof(struct ip6_tnl_net),
2271};
2272
2273/**
2274 * ip6_tunnel_init - register protocol and reserve needed resources
2275 *
2276 * Return: 0 on success
2277 **/
2278
2279static int __init ip6_tunnel_init(void)
2280{
2281 int err;
2282
2283 if (!ipv6_mod_enabled())
2284 return -EOPNOTSUPP;
2285
2286 err = register_pernet_device(&ip6_tnl_net_ops);
2287 if (err < 0)
2288 goto out_pernet;
2289
2290 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2291 if (err < 0) {
2292 pr_err("%s: can't register ip4ip6\n", __func__);
2293 goto out_ip4ip6;
2294 }
2295
2296 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2297 if (err < 0) {
2298 pr_err("%s: can't register ip6ip6\n", __func__);
2299 goto out_ip6ip6;
2300 }
2301 err = rtnl_link_register(&ip6_link_ops);
2302 if (err < 0)
2303 goto rtnl_link_failed;
2304
2305 return 0;
2306
2307rtnl_link_failed:
2308 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2309out_ip6ip6:
2310 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2311out_ip4ip6:
2312 unregister_pernet_device(&ip6_tnl_net_ops);
2313out_pernet:
2314 return err;
2315}
2316
2317/**
2318 * ip6_tunnel_cleanup - free resources and unregister protocol
2319 **/
2320
2321static void __exit ip6_tunnel_cleanup(void)
2322{
2323 rtnl_link_unregister(&ip6_link_ops);
2324 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2325 pr_info("%s: can't deregister ip4ip6\n", __func__);
2326
2327 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2328 pr_info("%s: can't deregister ip6ip6\n", __func__);
2329
2330 unregister_pernet_device(&ip6_tnl_net_ops);
2331}
2332
2333module_init(ip6_tunnel_init);
2334module_exit(ip6_tunnel_cleanup);