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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 tunneling device
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Ville Nuorvala <vnuorval@tcs.hut.fi>
8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
9 *
10 * Based on:
11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
12 *
13 * RFC 2473
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/module.h>
19#include <linux/capability.h>
20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/sockios.h>
23#include <linux/icmp.h>
24#include <linux/if.h>
25#include <linux/in.h>
26#include <linux/ip.h>
27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/netdevice.h>
30#include <linux/if_arp.h>
31#include <linux/icmpv6.h>
32#include <linux/init.h>
33#include <linux/route.h>
34#include <linux/rtnetlink.h>
35#include <linux/netfilter_ipv6.h>
36#include <linux/slab.h>
37#include <linux/hash.h>
38#include <linux/etherdevice.h>
39
40#include <linux/uaccess.h>
41#include <linux/atomic.h>
42
43#include <net/icmp.h>
44#include <net/ip.h>
45#include <net/ip_tunnels.h>
46#include <net/ipv6.h>
47#include <net/ip6_route.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
50#include <net/xfrm.h>
51#include <net/dsfield.h>
52#include <net/inet_ecn.h>
53#include <net/net_namespace.h>
54#include <net/netns/generic.h>
55#include <net/dst_metadata.h>
56
57MODULE_AUTHOR("Ville Nuorvala");
58MODULE_DESCRIPTION("IPv6 tunneling device");
59MODULE_LICENSE("GPL");
60MODULE_ALIAS_RTNL_LINK("ip6tnl");
61MODULE_ALIAS_NETDEV("ip6tnl0");
62
63#define IP6_TUNNEL_HASH_SIZE_SHIFT 5
64#define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
65
66static bool log_ecn_error = true;
67module_param(log_ecn_error, bool, 0644);
68MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
69
70static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
71{
72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
73
74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
75}
76
77static int ip6_tnl_dev_init(struct net_device *dev);
78static void ip6_tnl_dev_setup(struct net_device *dev);
79static struct rtnl_link_ops ip6_link_ops __read_mostly;
80
81static unsigned int ip6_tnl_net_id __read_mostly;
82struct ip6_tnl_net {
83 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
85 /* lists for storing tunnels in use */
86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
87 struct ip6_tnl __rcu *tnls_wc[1];
88 struct ip6_tnl __rcu **tnls[2];
89 struct ip6_tnl __rcu *collect_md_tun;
90};
91
92static inline int ip6_tnl_mpls_supported(void)
93{
94 return IS_ENABLED(CONFIG_MPLS);
95}
96
97#define for_each_ip6_tunnel_rcu(start) \
98 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
99
100/**
101 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
102 * @net: network namespace
103 * @link: ifindex of underlying interface
104 * @remote: the address of the tunnel exit-point
105 * @local: the address of the tunnel entry-point
106 *
107 * Return:
108 * tunnel matching given end-points if found,
109 * else fallback tunnel if its device is up,
110 * else %NULL
111 **/
112
113static struct ip6_tnl *
114ip6_tnl_lookup(struct net *net, int link,
115 const struct in6_addr *remote, const struct in6_addr *local)
116{
117 unsigned int hash = HASH(remote, local);
118 struct ip6_tnl *t, *cand = NULL;
119 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
120 struct in6_addr any;
121
122 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
123 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
124 !ipv6_addr_equal(remote, &t->parms.raddr) ||
125 !(t->dev->flags & IFF_UP))
126 continue;
127
128 if (link == t->parms.link)
129 return t;
130 else
131 cand = t;
132 }
133
134 memset(&any, 0, sizeof(any));
135 hash = HASH(&any, local);
136 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_any(&t->parms.raddr) ||
139 !(t->dev->flags & IFF_UP))
140 continue;
141
142 if (link == t->parms.link)
143 return t;
144 else if (!cand)
145 cand = t;
146 }
147
148 hash = HASH(remote, &any);
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
151 !ipv6_addr_any(&t->parms.laddr) ||
152 !(t->dev->flags & IFF_UP))
153 continue;
154
155 if (link == t->parms.link)
156 return t;
157 else if (!cand)
158 cand = t;
159 }
160
161 if (cand)
162 return cand;
163
164 t = rcu_dereference(ip6n->collect_md_tun);
165 if (t && t->dev->flags & IFF_UP)
166 return t;
167
168 t = rcu_dereference(ip6n->tnls_wc[0]);
169 if (t && (t->dev->flags & IFF_UP))
170 return t;
171
172 return NULL;
173}
174
175/**
176 * ip6_tnl_bucket - get head of list matching given tunnel parameters
177 * @ip6n: the private data for ip6_vti in the netns
178 * @p: parameters containing tunnel end-points
179 *
180 * Description:
181 * ip6_tnl_bucket() returns the head of the list matching the
182 * &struct in6_addr entries laddr and raddr in @p.
183 *
184 * Return: head of IPv6 tunnel list
185 **/
186
187static struct ip6_tnl __rcu **
188ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
189{
190 const struct in6_addr *remote = &p->raddr;
191 const struct in6_addr *local = &p->laddr;
192 unsigned int h = 0;
193 int prio = 0;
194
195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
196 prio = 1;
197 h = HASH(remote, local);
198 }
199 return &ip6n->tnls[prio][h];
200}
201
202/**
203 * ip6_tnl_link - add tunnel to hash table
204 * @ip6n: the private data for ip6_vti in the netns
205 * @t: tunnel to be added
206 **/
207
208static void
209ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
210{
211 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
212
213 if (t->parms.collect_md)
214 rcu_assign_pointer(ip6n->collect_md_tun, t);
215 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
216 rcu_assign_pointer(*tp, t);
217}
218
219/**
220 * ip6_tnl_unlink - remove tunnel from hash table
221 * @ip6n: the private data for ip6_vti in the netns
222 * @t: tunnel to be removed
223 **/
224
225static void
226ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
227{
228 struct ip6_tnl __rcu **tp;
229 struct ip6_tnl *iter;
230
231 if (t->parms.collect_md)
232 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
233
234 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
235 (iter = rtnl_dereference(*tp)) != NULL;
236 tp = &iter->next) {
237 if (t == iter) {
238 rcu_assign_pointer(*tp, t->next);
239 break;
240 }
241 }
242}
243
244static void ip6_dev_free(struct net_device *dev)
245{
246 struct ip6_tnl *t = netdev_priv(dev);
247
248 gro_cells_destroy(&t->gro_cells);
249 dst_cache_destroy(&t->dst_cache);
250 free_percpu(dev->tstats);
251}
252
253static int ip6_tnl_create2(struct net_device *dev)
254{
255 struct ip6_tnl *t = netdev_priv(dev);
256 struct net *net = dev_net(dev);
257 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
258 int err;
259
260 t = netdev_priv(dev);
261
262 dev->rtnl_link_ops = &ip6_link_ops;
263 err = register_netdevice(dev);
264 if (err < 0)
265 goto out;
266
267 strcpy(t->parms.name, dev->name);
268
269 ip6_tnl_link(ip6n, t);
270 return 0;
271
272out:
273 return err;
274}
275
276/**
277 * ip6_tnl_create - create a new tunnel
278 * @net: network namespace
279 * @p: tunnel parameters
280 *
281 * Description:
282 * Create tunnel matching given parameters.
283 *
284 * Return:
285 * created tunnel or error pointer
286 **/
287
288static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
289{
290 struct net_device *dev;
291 struct ip6_tnl *t;
292 char name[IFNAMSIZ];
293 int err = -E2BIG;
294
295 if (p->name[0]) {
296 if (!dev_valid_name(p->name))
297 goto failed;
298 strlcpy(name, p->name, IFNAMSIZ);
299 } else {
300 sprintf(name, "ip6tnl%%d");
301 }
302 err = -ENOMEM;
303 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
304 ip6_tnl_dev_setup);
305 if (!dev)
306 goto failed;
307
308 dev_net_set(dev, net);
309
310 t = netdev_priv(dev);
311 t->parms = *p;
312 t->net = dev_net(dev);
313 err = ip6_tnl_create2(dev);
314 if (err < 0)
315 goto failed_free;
316
317 return t;
318
319failed_free:
320 free_netdev(dev);
321failed:
322 return ERR_PTR(err);
323}
324
325/**
326 * ip6_tnl_locate - find or create tunnel matching given parameters
327 * @net: network namespace
328 * @p: tunnel parameters
329 * @create: != 0 if allowed to create new tunnel if no match found
330 *
331 * Description:
332 * ip6_tnl_locate() first tries to locate an existing tunnel
333 * based on @parms. If this is unsuccessful, but @create is set a new
334 * tunnel device is created and registered for use.
335 *
336 * Return:
337 * matching tunnel or error pointer
338 **/
339
340static struct ip6_tnl *ip6_tnl_locate(struct net *net,
341 struct __ip6_tnl_parm *p, int create)
342{
343 const struct in6_addr *remote = &p->raddr;
344 const struct in6_addr *local = &p->laddr;
345 struct ip6_tnl __rcu **tp;
346 struct ip6_tnl *t;
347 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
348
349 for (tp = ip6_tnl_bucket(ip6n, p);
350 (t = rtnl_dereference(*tp)) != NULL;
351 tp = &t->next) {
352 if (ipv6_addr_equal(local, &t->parms.laddr) &&
353 ipv6_addr_equal(remote, &t->parms.raddr) &&
354 p->link == t->parms.link) {
355 if (create)
356 return ERR_PTR(-EEXIST);
357
358 return t;
359 }
360 }
361 if (!create)
362 return ERR_PTR(-ENODEV);
363 return ip6_tnl_create(net, p);
364}
365
366/**
367 * ip6_tnl_dev_uninit - tunnel device uninitializer
368 * @dev: the device to be destroyed
369 *
370 * Description:
371 * ip6_tnl_dev_uninit() removes tunnel from its list
372 **/
373
374static void
375ip6_tnl_dev_uninit(struct net_device *dev)
376{
377 struct ip6_tnl *t = netdev_priv(dev);
378 struct net *net = t->net;
379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
380
381 if (dev == ip6n->fb_tnl_dev)
382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
383 else
384 ip6_tnl_unlink(ip6n, t);
385 dst_cache_reset(&t->dst_cache);
386 dev_put(dev);
387}
388
389/**
390 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
391 * @skb: received socket buffer
392 * @raw: the ICMPv6 error message data
393 *
394 * Return:
395 * 0 if none was found,
396 * else index to encapsulation limit
397 **/
398
399__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
400{
401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
402 unsigned int nhoff = raw - skb->data;
403 unsigned int off = nhoff + sizeof(*ipv6h);
404 u8 next, nexthdr = ipv6h->nexthdr;
405
406 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
407 struct ipv6_opt_hdr *hdr;
408 u16 optlen;
409
410 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
411 break;
412
413 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
414 if (nexthdr == NEXTHDR_FRAGMENT) {
415 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
416 if (frag_hdr->frag_off)
417 break;
418 optlen = 8;
419 } else if (nexthdr == NEXTHDR_AUTH) {
420 optlen = ipv6_authlen(hdr);
421 } else {
422 optlen = ipv6_optlen(hdr);
423 }
424 /* cache hdr->nexthdr, since pskb_may_pull() might
425 * invalidate hdr
426 */
427 next = hdr->nexthdr;
428 if (nexthdr == NEXTHDR_DEST) {
429 u16 i = 2;
430
431 /* Remember : hdr is no longer valid at this point. */
432 if (!pskb_may_pull(skb, off + optlen))
433 break;
434
435 while (1) {
436 struct ipv6_tlv_tnl_enc_lim *tel;
437
438 /* No more room for encapsulation limit */
439 if (i + sizeof(*tel) > optlen)
440 break;
441
442 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
443 /* return index of option if found and valid */
444 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
445 tel->length == 1)
446 return i + off - nhoff;
447 /* else jump to next option */
448 if (tel->type)
449 i += tel->length + 2;
450 else
451 i++;
452 }
453 }
454 nexthdr = next;
455 off += optlen;
456 }
457 return 0;
458}
459EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
460
461/* ip6_tnl_err() should handle errors in the tunnel according to the
462 * specifications in RFC 2473.
463 */
464static int
465ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
466 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
467{
468 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
469 struct net *net = dev_net(skb->dev);
470 u8 rel_type = ICMPV6_DEST_UNREACH;
471 u8 rel_code = ICMPV6_ADDR_UNREACH;
472 __u32 rel_info = 0;
473 struct ip6_tnl *t;
474 int err = -ENOENT;
475 int rel_msg = 0;
476 u8 tproto;
477 __u16 len;
478
479 /* If the packet doesn't contain the original IPv6 header we are
480 in trouble since we might need the source address for further
481 processing of the error. */
482
483 rcu_read_lock();
484 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
485 if (!t)
486 goto out;
487
488 tproto = READ_ONCE(t->parms.proto);
489 if (tproto != ipproto && tproto != 0)
490 goto out;
491
492 err = 0;
493
494 switch (*type) {
495 case ICMPV6_DEST_UNREACH:
496 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
497 t->parms.name);
498 rel_msg = 1;
499 break;
500 case ICMPV6_TIME_EXCEED:
501 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
502 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
503 t->parms.name);
504 rel_msg = 1;
505 }
506 break;
507 case ICMPV6_PARAMPROB: {
508 struct ipv6_tlv_tnl_enc_lim *tel;
509 __u32 teli;
510
511 teli = 0;
512 if ((*code) == ICMPV6_HDR_FIELD)
513 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
514
515 if (teli && teli == *info - 2) {
516 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
517 if (tel->encap_limit == 0) {
518 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
519 t->parms.name);
520 rel_msg = 1;
521 }
522 } else {
523 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
524 t->parms.name);
525 }
526 break;
527 }
528 case ICMPV6_PKT_TOOBIG: {
529 __u32 mtu;
530
531 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
532 sock_net_uid(net, NULL));
533 mtu = *info - offset;
534 if (mtu < IPV6_MIN_MTU)
535 mtu = IPV6_MIN_MTU;
536 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
537 if (len > mtu) {
538 rel_type = ICMPV6_PKT_TOOBIG;
539 rel_code = 0;
540 rel_info = mtu;
541 rel_msg = 1;
542 }
543 break;
544 }
545 case NDISC_REDIRECT:
546 ip6_redirect(skb, net, skb->dev->ifindex, 0,
547 sock_net_uid(net, NULL));
548 break;
549 }
550
551 *type = rel_type;
552 *code = rel_code;
553 *info = rel_info;
554 *msg = rel_msg;
555
556out:
557 rcu_read_unlock();
558 return err;
559}
560
561static int
562ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
563 u8 type, u8 code, int offset, __be32 info)
564{
565 __u32 rel_info = ntohl(info);
566 const struct iphdr *eiph;
567 struct sk_buff *skb2;
568 int err, rel_msg = 0;
569 u8 rel_type = type;
570 u8 rel_code = code;
571 struct rtable *rt;
572 struct flowi4 fl4;
573
574 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
575 &rel_msg, &rel_info, offset);
576 if (err < 0)
577 return err;
578
579 if (rel_msg == 0)
580 return 0;
581
582 switch (rel_type) {
583 case ICMPV6_DEST_UNREACH:
584 if (rel_code != ICMPV6_ADDR_UNREACH)
585 return 0;
586 rel_type = ICMP_DEST_UNREACH;
587 rel_code = ICMP_HOST_UNREACH;
588 break;
589 case ICMPV6_PKT_TOOBIG:
590 if (rel_code != 0)
591 return 0;
592 rel_type = ICMP_DEST_UNREACH;
593 rel_code = ICMP_FRAG_NEEDED;
594 break;
595 default:
596 return 0;
597 }
598
599 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
600 return 0;
601
602 skb2 = skb_clone(skb, GFP_ATOMIC);
603 if (!skb2)
604 return 0;
605
606 skb_dst_drop(skb2);
607
608 skb_pull(skb2, offset);
609 skb_reset_network_header(skb2);
610 eiph = ip_hdr(skb2);
611
612 /* Try to guess incoming interface */
613 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
614 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
615 if (IS_ERR(rt))
616 goto out;
617
618 skb2->dev = rt->dst.dev;
619 ip_rt_put(rt);
620
621 /* route "incoming" packet */
622 if (rt->rt_flags & RTCF_LOCAL) {
623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
624 eiph->daddr, eiph->saddr, 0, 0,
625 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
626 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
627 if (!IS_ERR(rt))
628 ip_rt_put(rt);
629 goto out;
630 }
631 skb_dst_set(skb2, &rt->dst);
632 } else {
633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
634 skb2->dev) ||
635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
636 goto out;
637 }
638
639 /* change mtu on this route */
640 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
641 if (rel_info > dst_mtu(skb_dst(skb2)))
642 goto out;
643
644 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
645 }
646
647 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
648
649out:
650 kfree_skb(skb2);
651 return 0;
652}
653
654static int
655ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
656 u8 type, u8 code, int offset, __be32 info)
657{
658 __u32 rel_info = ntohl(info);
659 int err, rel_msg = 0;
660 u8 rel_type = type;
661 u8 rel_code = code;
662
663 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
664 &rel_msg, &rel_info, offset);
665 if (err < 0)
666 return err;
667
668 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
669 struct rt6_info *rt;
670 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
671
672 if (!skb2)
673 return 0;
674
675 skb_dst_drop(skb2);
676 skb_pull(skb2, offset);
677 skb_reset_network_header(skb2);
678
679 /* Try to guess incoming interface */
680 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
681 NULL, 0, skb2, 0);
682
683 if (rt && rt->dst.dev)
684 skb2->dev = rt->dst.dev;
685
686 icmpv6_send(skb2, rel_type, rel_code, rel_info);
687
688 ip6_rt_put(rt);
689
690 kfree_skb(skb2);
691 }
692
693 return 0;
694}
695
696static int
697mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
698 u8 type, u8 code, int offset, __be32 info)
699{
700 __u32 rel_info = ntohl(info);
701 int err, rel_msg = 0;
702 u8 rel_type = type;
703 u8 rel_code = code;
704
705 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
706 &rel_msg, &rel_info, offset);
707 return err;
708}
709
710static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
711 const struct ipv6hdr *ipv6h,
712 struct sk_buff *skb)
713{
714 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
715
716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
717 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
718
719 return IP6_ECN_decapsulate(ipv6h, skb);
720}
721
722static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
723 const struct ipv6hdr *ipv6h,
724 struct sk_buff *skb)
725{
726 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
727 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
728
729 return IP6_ECN_decapsulate(ipv6h, skb);
730}
731
732static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
733 const struct ipv6hdr *ipv6h,
734 struct sk_buff *skb)
735{
736 /* ECN is not supported in AF_MPLS */
737 return 0;
738}
739
740__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
741 const struct in6_addr *laddr,
742 const struct in6_addr *raddr)
743{
744 struct __ip6_tnl_parm *p = &t->parms;
745 int ltype = ipv6_addr_type(laddr);
746 int rtype = ipv6_addr_type(raddr);
747 __u32 flags = 0;
748
749 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
750 flags = IP6_TNL_F_CAP_PER_PACKET;
751 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
752 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
753 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
754 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
755 if (ltype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_XMIT;
757 if (rtype&IPV6_ADDR_UNICAST)
758 flags |= IP6_TNL_F_CAP_RCV;
759 }
760 return flags;
761}
762EXPORT_SYMBOL(ip6_tnl_get_cap);
763
764/* called with rcu_read_lock() */
765int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
766 const struct in6_addr *laddr,
767 const struct in6_addr *raddr)
768{
769 struct __ip6_tnl_parm *p = &t->parms;
770 int ret = 0;
771 struct net *net = t->net;
772
773 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
774 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
775 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
776 struct net_device *ldev = NULL;
777
778 if (p->link)
779 ldev = dev_get_by_index_rcu(net, p->link);
780
781 if ((ipv6_addr_is_multicast(laddr) ||
782 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
783 0, IFA_F_TENTATIVE))) &&
784 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
785 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
786 0, IFA_F_TENTATIVE))))
787 ret = 1;
788 }
789 return ret;
790}
791EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
792
793static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
794 const struct tnl_ptk_info *tpi,
795 struct metadata_dst *tun_dst,
796 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
797 const struct ipv6hdr *ipv6h,
798 struct sk_buff *skb),
799 bool log_ecn_err)
800{
801 struct pcpu_sw_netstats *tstats;
802 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
803 int err;
804
805 if ((!(tpi->flags & TUNNEL_CSUM) &&
806 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
807 ((tpi->flags & TUNNEL_CSUM) &&
808 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
809 tunnel->dev->stats.rx_crc_errors++;
810 tunnel->dev->stats.rx_errors++;
811 goto drop;
812 }
813
814 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
815 if (!(tpi->flags & TUNNEL_SEQ) ||
816 (tunnel->i_seqno &&
817 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
818 tunnel->dev->stats.rx_fifo_errors++;
819 tunnel->dev->stats.rx_errors++;
820 goto drop;
821 }
822 tunnel->i_seqno = ntohl(tpi->seq) + 1;
823 }
824
825 skb->protocol = tpi->proto;
826
827 /* Warning: All skb pointers will be invalidated! */
828 if (tunnel->dev->type == ARPHRD_ETHER) {
829 if (!pskb_may_pull(skb, ETH_HLEN)) {
830 tunnel->dev->stats.rx_length_errors++;
831 tunnel->dev->stats.rx_errors++;
832 goto drop;
833 }
834
835 ipv6h = ipv6_hdr(skb);
836 skb->protocol = eth_type_trans(skb, tunnel->dev);
837 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
838 } else {
839 skb->dev = tunnel->dev;
840 skb_reset_mac_header(skb);
841 }
842
843 skb_reset_network_header(skb);
844 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
845
846 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
847
848 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
849 if (unlikely(err)) {
850 if (log_ecn_err)
851 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
852 &ipv6h->saddr,
853 ipv6_get_dsfield(ipv6h));
854 if (err > 1) {
855 ++tunnel->dev->stats.rx_frame_errors;
856 ++tunnel->dev->stats.rx_errors;
857 goto drop;
858 }
859 }
860
861 tstats = this_cpu_ptr(tunnel->dev->tstats);
862 u64_stats_update_begin(&tstats->syncp);
863 tstats->rx_packets++;
864 tstats->rx_bytes += skb->len;
865 u64_stats_update_end(&tstats->syncp);
866
867 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
868
869 if (tun_dst)
870 skb_dst_set(skb, (struct dst_entry *)tun_dst);
871
872 gro_cells_receive(&tunnel->gro_cells, skb);
873 return 0;
874
875drop:
876 if (tun_dst)
877 dst_release((struct dst_entry *)tun_dst);
878 kfree_skb(skb);
879 return 0;
880}
881
882int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
883 const struct tnl_ptk_info *tpi,
884 struct metadata_dst *tun_dst,
885 bool log_ecn_err)
886{
887 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
888 const struct ipv6hdr *ipv6h,
889 struct sk_buff *skb);
890
891 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
892 if (tpi->proto == htons(ETH_P_IP))
893 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
894
895 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
896 log_ecn_err);
897}
898EXPORT_SYMBOL(ip6_tnl_rcv);
899
900static const struct tnl_ptk_info tpi_v6 = {
901 /* no tunnel info required for ipxip6. */
902 .proto = htons(ETH_P_IPV6),
903};
904
905static const struct tnl_ptk_info tpi_v4 = {
906 /* no tunnel info required for ipxip6. */
907 .proto = htons(ETH_P_IP),
908};
909
910static const struct tnl_ptk_info tpi_mpls = {
911 /* no tunnel info required for mplsip6. */
912 .proto = htons(ETH_P_MPLS_UC),
913};
914
915static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
916 const struct tnl_ptk_info *tpi,
917 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
918 const struct ipv6hdr *ipv6h,
919 struct sk_buff *skb))
920{
921 struct ip6_tnl *t;
922 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
923 struct metadata_dst *tun_dst = NULL;
924 int ret = -1;
925
926 rcu_read_lock();
927 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
928
929 if (t) {
930 u8 tproto = READ_ONCE(t->parms.proto);
931
932 if (tproto != ipproto && tproto != 0)
933 goto drop;
934 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
935 goto drop;
936 ipv6h = ipv6_hdr(skb);
937 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
938 goto drop;
939 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
940 goto drop;
941 if (t->parms.collect_md) {
942 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
943 if (!tun_dst)
944 goto drop;
945 }
946 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
947 log_ecn_error);
948 }
949
950 rcu_read_unlock();
951
952 return ret;
953
954drop:
955 rcu_read_unlock();
956 kfree_skb(skb);
957 return 0;
958}
959
960static int ip4ip6_rcv(struct sk_buff *skb)
961{
962 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
963 ip4ip6_dscp_ecn_decapsulate);
964}
965
966static int ip6ip6_rcv(struct sk_buff *skb)
967{
968 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
969 ip6ip6_dscp_ecn_decapsulate);
970}
971
972static int mplsip6_rcv(struct sk_buff *skb)
973{
974 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
975 mplsip6_dscp_ecn_decapsulate);
976}
977
978struct ipv6_tel_txoption {
979 struct ipv6_txoptions ops;
980 __u8 dst_opt[8];
981};
982
983static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
984{
985 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
986
987 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
988 opt->dst_opt[3] = 1;
989 opt->dst_opt[4] = encap_limit;
990 opt->dst_opt[5] = IPV6_TLV_PADN;
991 opt->dst_opt[6] = 1;
992
993 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
994 opt->ops.opt_nflen = 8;
995}
996
997/**
998 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
999 * @t: the outgoing tunnel device
1000 * @hdr: IPv6 header from the incoming packet
1001 *
1002 * Description:
1003 * Avoid trivial tunneling loop by checking that tunnel exit-point
1004 * doesn't match source of incoming packet.
1005 *
1006 * Return:
1007 * 1 if conflict,
1008 * 0 else
1009 **/
1010
1011static inline bool
1012ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1013{
1014 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1015}
1016
1017int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1018 const struct in6_addr *laddr,
1019 const struct in6_addr *raddr)
1020{
1021 struct __ip6_tnl_parm *p = &t->parms;
1022 int ret = 0;
1023 struct net *net = t->net;
1024
1025 if (t->parms.collect_md)
1026 return 1;
1027
1028 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1029 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1030 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1031 struct net_device *ldev = NULL;
1032
1033 rcu_read_lock();
1034 if (p->link)
1035 ldev = dev_get_by_index_rcu(net, p->link);
1036
1037 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1038 0, IFA_F_TENTATIVE)))
1039 pr_warn("%s xmit: Local address not yet configured!\n",
1040 p->name);
1041 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1042 !ipv6_addr_is_multicast(raddr) &&
1043 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1044 true, 0, IFA_F_TENTATIVE)))
1045 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1046 p->name);
1047 else
1048 ret = 1;
1049 rcu_read_unlock();
1050 }
1051 return ret;
1052}
1053EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1054
1055/**
1056 * ip6_tnl_xmit - encapsulate packet and send
1057 * @skb: the outgoing socket buffer
1058 * @dev: the outgoing tunnel device
1059 * @dsfield: dscp code for outer header
1060 * @fl6: flow of tunneled packet
1061 * @encap_limit: encapsulation limit
1062 * @pmtu: Path MTU is stored if packet is too big
1063 * @proto: next header value
1064 *
1065 * Description:
1066 * Build new header and do some sanity checks on the packet before sending
1067 * it.
1068 *
1069 * Return:
1070 * 0 on success
1071 * -1 fail
1072 * %-EMSGSIZE message too big. return mtu in this case.
1073 **/
1074
1075int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1076 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1077 __u8 proto)
1078{
1079 struct ip6_tnl *t = netdev_priv(dev);
1080 struct net *net = t->net;
1081 struct net_device_stats *stats = &t->dev->stats;
1082 struct ipv6hdr *ipv6h;
1083 struct ipv6_tel_txoption opt;
1084 struct dst_entry *dst = NULL, *ndst = NULL;
1085 struct net_device *tdev;
1086 int mtu;
1087 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1088 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1089 unsigned int max_headroom = psh_hlen;
1090 bool use_cache = false;
1091 u8 hop_limit;
1092 int err = -1;
1093
1094 if (t->parms.collect_md) {
1095 hop_limit = skb_tunnel_info(skb)->key.ttl;
1096 goto route_lookup;
1097 } else {
1098 hop_limit = t->parms.hop_limit;
1099 }
1100
1101 /* NBMA tunnel */
1102 if (ipv6_addr_any(&t->parms.raddr)) {
1103 if (skb->protocol == htons(ETH_P_IPV6)) {
1104 struct in6_addr *addr6;
1105 struct neighbour *neigh;
1106 int addr_type;
1107
1108 if (!skb_dst(skb))
1109 goto tx_err_link_failure;
1110
1111 neigh = dst_neigh_lookup(skb_dst(skb),
1112 &ipv6_hdr(skb)->daddr);
1113 if (!neigh)
1114 goto tx_err_link_failure;
1115
1116 addr6 = (struct in6_addr *)&neigh->primary_key;
1117 addr_type = ipv6_addr_type(addr6);
1118
1119 if (addr_type == IPV6_ADDR_ANY)
1120 addr6 = &ipv6_hdr(skb)->daddr;
1121
1122 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1123 neigh_release(neigh);
1124 }
1125 } else if (t->parms.proto != 0 && !(t->parms.flags &
1126 (IP6_TNL_F_USE_ORIG_TCLASS |
1127 IP6_TNL_F_USE_ORIG_FWMARK))) {
1128 /* enable the cache only if neither the outer protocol nor the
1129 * routing decision depends on the current inner header value
1130 */
1131 use_cache = true;
1132 }
1133
1134 if (use_cache)
1135 dst = dst_cache_get(&t->dst_cache);
1136
1137 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1138 goto tx_err_link_failure;
1139
1140 if (!dst) {
1141route_lookup:
1142 /* add dsfield to flowlabel for route lookup */
1143 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1144
1145 dst = ip6_route_output(net, NULL, fl6);
1146
1147 if (dst->error)
1148 goto tx_err_link_failure;
1149 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1150 if (IS_ERR(dst)) {
1151 err = PTR_ERR(dst);
1152 dst = NULL;
1153 goto tx_err_link_failure;
1154 }
1155 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1156 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1157 &fl6->daddr, 0, &fl6->saddr))
1158 goto tx_err_link_failure;
1159 ndst = dst;
1160 }
1161
1162 tdev = dst->dev;
1163
1164 if (tdev == dev) {
1165 stats->collisions++;
1166 net_warn_ratelimited("%s: Local routing loop detected!\n",
1167 t->parms.name);
1168 goto tx_err_dst_release;
1169 }
1170 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1171 if (encap_limit >= 0) {
1172 max_headroom += 8;
1173 mtu -= 8;
1174 }
1175 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1176 IPV6_MIN_MTU : IPV4_MIN_MTU);
1177
1178 skb_dst_update_pmtu_no_confirm(skb, mtu);
1179 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1180 *pmtu = mtu;
1181 err = -EMSGSIZE;
1182 goto tx_err_dst_release;
1183 }
1184
1185 if (t->err_count > 0) {
1186 if (time_before(jiffies,
1187 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1188 t->err_count--;
1189
1190 dst_link_failure(skb);
1191 } else {
1192 t->err_count = 0;
1193 }
1194 }
1195
1196 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1197
1198 /*
1199 * Okay, now see if we can stuff it in the buffer as-is.
1200 */
1201 max_headroom += LL_RESERVED_SPACE(tdev);
1202
1203 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1204 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1205 struct sk_buff *new_skb;
1206
1207 new_skb = skb_realloc_headroom(skb, max_headroom);
1208 if (!new_skb)
1209 goto tx_err_dst_release;
1210
1211 if (skb->sk)
1212 skb_set_owner_w(new_skb, skb->sk);
1213 consume_skb(skb);
1214 skb = new_skb;
1215 }
1216
1217 if (t->parms.collect_md) {
1218 if (t->encap.type != TUNNEL_ENCAP_NONE)
1219 goto tx_err_dst_release;
1220 } else {
1221 if (use_cache && ndst)
1222 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1223 }
1224 skb_dst_set(skb, dst);
1225
1226 if (hop_limit == 0) {
1227 if (skb->protocol == htons(ETH_P_IP))
1228 hop_limit = ip_hdr(skb)->ttl;
1229 else if (skb->protocol == htons(ETH_P_IPV6))
1230 hop_limit = ipv6_hdr(skb)->hop_limit;
1231 else
1232 hop_limit = ip6_dst_hoplimit(dst);
1233 }
1234
1235 /* Calculate max headroom for all the headers and adjust
1236 * needed_headroom if necessary.
1237 */
1238 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1239 + dst->header_len + t->hlen;
1240 if (max_headroom > dev->needed_headroom)
1241 dev->needed_headroom = max_headroom;
1242
1243 err = ip6_tnl_encap(skb, t, &proto, fl6);
1244 if (err)
1245 return err;
1246
1247 if (encap_limit >= 0) {
1248 init_tel_txopt(&opt, encap_limit);
1249 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1250 }
1251
1252 skb_push(skb, sizeof(struct ipv6hdr));
1253 skb_reset_network_header(skb);
1254 ipv6h = ipv6_hdr(skb);
1255 ip6_flow_hdr(ipv6h, dsfield,
1256 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1257 ipv6h->hop_limit = hop_limit;
1258 ipv6h->nexthdr = proto;
1259 ipv6h->saddr = fl6->saddr;
1260 ipv6h->daddr = fl6->daddr;
1261 ip6tunnel_xmit(NULL, skb, dev);
1262 return 0;
1263tx_err_link_failure:
1264 stats->tx_carrier_errors++;
1265 dst_link_failure(skb);
1266tx_err_dst_release:
1267 dst_release(dst);
1268 return err;
1269}
1270EXPORT_SYMBOL(ip6_tnl_xmit);
1271
1272static inline int
1273ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1274 u8 protocol)
1275{
1276 struct ip6_tnl *t = netdev_priv(dev);
1277 struct ipv6hdr *ipv6h;
1278 const struct iphdr *iph;
1279 int encap_limit = -1;
1280 __u16 offset;
1281 struct flowi6 fl6;
1282 __u8 dsfield, orig_dsfield;
1283 __u32 mtu;
1284 u8 tproto;
1285 int err;
1286
1287 tproto = READ_ONCE(t->parms.proto);
1288 if (tproto != protocol && tproto != 0)
1289 return -1;
1290
1291 if (t->parms.collect_md) {
1292 struct ip_tunnel_info *tun_info;
1293 const struct ip_tunnel_key *key;
1294
1295 tun_info = skb_tunnel_info(skb);
1296 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1297 ip_tunnel_info_af(tun_info) != AF_INET6))
1298 return -1;
1299 key = &tun_info->key;
1300 memset(&fl6, 0, sizeof(fl6));
1301 fl6.flowi6_proto = protocol;
1302 fl6.saddr = key->u.ipv6.src;
1303 fl6.daddr = key->u.ipv6.dst;
1304 fl6.flowlabel = key->label;
1305 dsfield = key->tos;
1306 switch (protocol) {
1307 case IPPROTO_IPIP:
1308 iph = ip_hdr(skb);
1309 orig_dsfield = ipv4_get_dsfield(iph);
1310 break;
1311 case IPPROTO_IPV6:
1312 ipv6h = ipv6_hdr(skb);
1313 orig_dsfield = ipv6_get_dsfield(ipv6h);
1314 break;
1315 default:
1316 orig_dsfield = dsfield;
1317 break;
1318 }
1319 } else {
1320 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1321 encap_limit = t->parms.encap_limit;
1322 if (protocol == IPPROTO_IPV6) {
1323 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1324 skb_network_header(skb));
1325 /* ip6_tnl_parse_tlv_enc_lim() might have
1326 * reallocated skb->head
1327 */
1328 if (offset > 0) {
1329 struct ipv6_tlv_tnl_enc_lim *tel;
1330
1331 tel = (void *)&skb_network_header(skb)[offset];
1332 if (tel->encap_limit == 0) {
1333 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1334 ICMPV6_HDR_FIELD, offset + 2);
1335 return -1;
1336 }
1337 encap_limit = tel->encap_limit - 1;
1338 }
1339 }
1340
1341 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1342 fl6.flowi6_proto = protocol;
1343
1344 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1345 fl6.flowi6_mark = skb->mark;
1346 else
1347 fl6.flowi6_mark = t->parms.fwmark;
1348 switch (protocol) {
1349 case IPPROTO_IPIP:
1350 iph = ip_hdr(skb);
1351 orig_dsfield = ipv4_get_dsfield(iph);
1352 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1353 dsfield = orig_dsfield;
1354 else
1355 dsfield = ip6_tclass(t->parms.flowinfo);
1356 break;
1357 case IPPROTO_IPV6:
1358 ipv6h = ipv6_hdr(skb);
1359 orig_dsfield = ipv6_get_dsfield(ipv6h);
1360 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1361 dsfield = orig_dsfield;
1362 else
1363 dsfield = ip6_tclass(t->parms.flowinfo);
1364 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1365 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1366 break;
1367 default:
1368 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1369 break;
1370 }
1371 }
1372
1373 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1374 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1375
1376 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1377 return -1;
1378
1379 skb_set_inner_ipproto(skb, protocol);
1380
1381 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1382 protocol);
1383 if (err != 0) {
1384 /* XXX: send ICMP error even if DF is not set. */
1385 if (err == -EMSGSIZE)
1386 switch (protocol) {
1387 case IPPROTO_IPIP:
1388 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1389 ICMP_FRAG_NEEDED, htonl(mtu));
1390 break;
1391 case IPPROTO_IPV6:
1392 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1393 break;
1394 default:
1395 break;
1396 }
1397 return -1;
1398 }
1399
1400 return 0;
1401}
1402
1403static netdev_tx_t
1404ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1405{
1406 struct ip6_tnl *t = netdev_priv(dev);
1407 struct net_device_stats *stats = &t->dev->stats;
1408 u8 ipproto;
1409 int ret;
1410
1411 if (!pskb_inet_may_pull(skb))
1412 goto tx_err;
1413
1414 switch (skb->protocol) {
1415 case htons(ETH_P_IP):
1416 ipproto = IPPROTO_IPIP;
1417 break;
1418 case htons(ETH_P_IPV6):
1419 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1420 goto tx_err;
1421 ipproto = IPPROTO_IPV6;
1422 break;
1423 case htons(ETH_P_MPLS_UC):
1424 ipproto = IPPROTO_MPLS;
1425 break;
1426 default:
1427 goto tx_err;
1428 }
1429
1430 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1431 if (ret < 0)
1432 goto tx_err;
1433
1434 return NETDEV_TX_OK;
1435
1436tx_err:
1437 stats->tx_errors++;
1438 stats->tx_dropped++;
1439 kfree_skb(skb);
1440 return NETDEV_TX_OK;
1441}
1442
1443static void ip6_tnl_link_config(struct ip6_tnl *t)
1444{
1445 struct net_device *dev = t->dev;
1446 struct net_device *tdev = NULL;
1447 struct __ip6_tnl_parm *p = &t->parms;
1448 struct flowi6 *fl6 = &t->fl.u.ip6;
1449 unsigned int mtu;
1450 int t_hlen;
1451
1452 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1453 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1454
1455 /* Set up flowi template */
1456 fl6->saddr = p->laddr;
1457 fl6->daddr = p->raddr;
1458 fl6->flowi6_oif = p->link;
1459 fl6->flowlabel = 0;
1460
1461 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1462 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1463 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1464 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1465
1466 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1467 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1468
1469 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1470 dev->flags |= IFF_POINTOPOINT;
1471 else
1472 dev->flags &= ~IFF_POINTOPOINT;
1473
1474 t->tun_hlen = 0;
1475 t->hlen = t->encap_hlen + t->tun_hlen;
1476 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1477
1478 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1479 int strict = (ipv6_addr_type(&p->raddr) &
1480 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1481
1482 struct rt6_info *rt = rt6_lookup(t->net,
1483 &p->raddr, &p->laddr,
1484 p->link, NULL, strict);
1485 if (rt) {
1486 tdev = rt->dst.dev;
1487 ip6_rt_put(rt);
1488 }
1489
1490 if (!tdev && p->link)
1491 tdev = __dev_get_by_index(t->net, p->link);
1492
1493 if (tdev) {
1494 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1495 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1496
1497 dev->mtu = mtu - t_hlen;
1498 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1499 dev->mtu -= 8;
1500
1501 if (dev->mtu < IPV6_MIN_MTU)
1502 dev->mtu = IPV6_MIN_MTU;
1503 }
1504 }
1505}
1506
1507/**
1508 * ip6_tnl_change - update the tunnel parameters
1509 * @t: tunnel to be changed
1510 * @p: tunnel configuration parameters
1511 *
1512 * Description:
1513 * ip6_tnl_change() updates the tunnel parameters
1514 **/
1515
1516static int
1517ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1518{
1519 t->parms.laddr = p->laddr;
1520 t->parms.raddr = p->raddr;
1521 t->parms.flags = p->flags;
1522 t->parms.hop_limit = p->hop_limit;
1523 t->parms.encap_limit = p->encap_limit;
1524 t->parms.flowinfo = p->flowinfo;
1525 t->parms.link = p->link;
1526 t->parms.proto = p->proto;
1527 t->parms.fwmark = p->fwmark;
1528 dst_cache_reset(&t->dst_cache);
1529 ip6_tnl_link_config(t);
1530 return 0;
1531}
1532
1533static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1534{
1535 struct net *net = t->net;
1536 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1537 int err;
1538
1539 ip6_tnl_unlink(ip6n, t);
1540 synchronize_net();
1541 err = ip6_tnl_change(t, p);
1542 ip6_tnl_link(ip6n, t);
1543 netdev_state_change(t->dev);
1544 return err;
1545}
1546
1547static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1548{
1549 /* for default tnl0 device allow to change only the proto */
1550 t->parms.proto = p->proto;
1551 netdev_state_change(t->dev);
1552 return 0;
1553}
1554
1555static void
1556ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1557{
1558 p->laddr = u->laddr;
1559 p->raddr = u->raddr;
1560 p->flags = u->flags;
1561 p->hop_limit = u->hop_limit;
1562 p->encap_limit = u->encap_limit;
1563 p->flowinfo = u->flowinfo;
1564 p->link = u->link;
1565 p->proto = u->proto;
1566 memcpy(p->name, u->name, sizeof(u->name));
1567}
1568
1569static void
1570ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1571{
1572 u->laddr = p->laddr;
1573 u->raddr = p->raddr;
1574 u->flags = p->flags;
1575 u->hop_limit = p->hop_limit;
1576 u->encap_limit = p->encap_limit;
1577 u->flowinfo = p->flowinfo;
1578 u->link = p->link;
1579 u->proto = p->proto;
1580 memcpy(u->name, p->name, sizeof(u->name));
1581}
1582
1583/**
1584 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1585 * @dev: virtual device associated with tunnel
1586 * @ifr: parameters passed from userspace
1587 * @cmd: command to be performed
1588 *
1589 * Description:
1590 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1591 * from userspace.
1592 *
1593 * The possible commands are the following:
1594 * %SIOCGETTUNNEL: get tunnel parameters for device
1595 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1596 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1597 * %SIOCDELTUNNEL: delete tunnel
1598 *
1599 * The fallback device "ip6tnl0", created during module
1600 * initialization, can be used for creating other tunnel devices.
1601 *
1602 * Return:
1603 * 0 on success,
1604 * %-EFAULT if unable to copy data to or from userspace,
1605 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1606 * %-EINVAL if passed tunnel parameters are invalid,
1607 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1608 * %-ENODEV if attempting to change or delete a nonexisting device
1609 **/
1610
1611static int
1612ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1613{
1614 int err = 0;
1615 struct ip6_tnl_parm p;
1616 struct __ip6_tnl_parm p1;
1617 struct ip6_tnl *t = netdev_priv(dev);
1618 struct net *net = t->net;
1619 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1620
1621 memset(&p1, 0, sizeof(p1));
1622
1623 switch (cmd) {
1624 case SIOCGETTUNNEL:
1625 if (dev == ip6n->fb_tnl_dev) {
1626 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1627 err = -EFAULT;
1628 break;
1629 }
1630 ip6_tnl_parm_from_user(&p1, &p);
1631 t = ip6_tnl_locate(net, &p1, 0);
1632 if (IS_ERR(t))
1633 t = netdev_priv(dev);
1634 } else {
1635 memset(&p, 0, sizeof(p));
1636 }
1637 ip6_tnl_parm_to_user(&p, &t->parms);
1638 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1639 err = -EFAULT;
1640 }
1641 break;
1642 case SIOCADDTUNNEL:
1643 case SIOCCHGTUNNEL:
1644 err = -EPERM;
1645 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1646 break;
1647 err = -EFAULT;
1648 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1649 break;
1650 err = -EINVAL;
1651 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1652 p.proto != 0)
1653 break;
1654 ip6_tnl_parm_from_user(&p1, &p);
1655 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1656 if (cmd == SIOCCHGTUNNEL) {
1657 if (!IS_ERR(t)) {
1658 if (t->dev != dev) {
1659 err = -EEXIST;
1660 break;
1661 }
1662 } else
1663 t = netdev_priv(dev);
1664 if (dev == ip6n->fb_tnl_dev)
1665 err = ip6_tnl0_update(t, &p1);
1666 else
1667 err = ip6_tnl_update(t, &p1);
1668 }
1669 if (!IS_ERR(t)) {
1670 err = 0;
1671 ip6_tnl_parm_to_user(&p, &t->parms);
1672 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1673 err = -EFAULT;
1674
1675 } else {
1676 err = PTR_ERR(t);
1677 }
1678 break;
1679 case SIOCDELTUNNEL:
1680 err = -EPERM;
1681 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1682 break;
1683
1684 if (dev == ip6n->fb_tnl_dev) {
1685 err = -EFAULT;
1686 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1687 break;
1688 err = -ENOENT;
1689 ip6_tnl_parm_from_user(&p1, &p);
1690 t = ip6_tnl_locate(net, &p1, 0);
1691 if (IS_ERR(t))
1692 break;
1693 err = -EPERM;
1694 if (t->dev == ip6n->fb_tnl_dev)
1695 break;
1696 dev = t->dev;
1697 }
1698 err = 0;
1699 unregister_netdevice(dev);
1700 break;
1701 default:
1702 err = -EINVAL;
1703 }
1704 return err;
1705}
1706
1707/**
1708 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1709 * @dev: virtual device associated with tunnel
1710 * @new_mtu: the new mtu
1711 *
1712 * Return:
1713 * 0 on success,
1714 * %-EINVAL if mtu too small
1715 **/
1716
1717int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1718{
1719 struct ip6_tnl *tnl = netdev_priv(dev);
1720
1721 if (tnl->parms.proto == IPPROTO_IPV6) {
1722 if (new_mtu < IPV6_MIN_MTU)
1723 return -EINVAL;
1724 } else {
1725 if (new_mtu < ETH_MIN_MTU)
1726 return -EINVAL;
1727 }
1728 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1729 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1730 return -EINVAL;
1731 } else {
1732 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1733 return -EINVAL;
1734 }
1735 dev->mtu = new_mtu;
1736 return 0;
1737}
1738EXPORT_SYMBOL(ip6_tnl_change_mtu);
1739
1740int ip6_tnl_get_iflink(const struct net_device *dev)
1741{
1742 struct ip6_tnl *t = netdev_priv(dev);
1743
1744 return t->parms.link;
1745}
1746EXPORT_SYMBOL(ip6_tnl_get_iflink);
1747
1748int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1749 unsigned int num)
1750{
1751 if (num >= MAX_IPTUN_ENCAP_OPS)
1752 return -ERANGE;
1753
1754 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1755 &ip6tun_encaps[num],
1756 NULL, ops) ? 0 : -1;
1757}
1758EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1759
1760int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1761 unsigned int num)
1762{
1763 int ret;
1764
1765 if (num >= MAX_IPTUN_ENCAP_OPS)
1766 return -ERANGE;
1767
1768 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1769 &ip6tun_encaps[num],
1770 ops, NULL) == ops) ? 0 : -1;
1771
1772 synchronize_net();
1773
1774 return ret;
1775}
1776EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1777
1778int ip6_tnl_encap_setup(struct ip6_tnl *t,
1779 struct ip_tunnel_encap *ipencap)
1780{
1781 int hlen;
1782
1783 memset(&t->encap, 0, sizeof(t->encap));
1784
1785 hlen = ip6_encap_hlen(ipencap);
1786 if (hlen < 0)
1787 return hlen;
1788
1789 t->encap.type = ipencap->type;
1790 t->encap.sport = ipencap->sport;
1791 t->encap.dport = ipencap->dport;
1792 t->encap.flags = ipencap->flags;
1793
1794 t->encap_hlen = hlen;
1795 t->hlen = t->encap_hlen + t->tun_hlen;
1796
1797 return 0;
1798}
1799EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1800
1801static const struct net_device_ops ip6_tnl_netdev_ops = {
1802 .ndo_init = ip6_tnl_dev_init,
1803 .ndo_uninit = ip6_tnl_dev_uninit,
1804 .ndo_start_xmit = ip6_tnl_start_xmit,
1805 .ndo_do_ioctl = ip6_tnl_ioctl,
1806 .ndo_change_mtu = ip6_tnl_change_mtu,
1807 .ndo_get_stats64 = dev_get_tstats64,
1808 .ndo_get_iflink = ip6_tnl_get_iflink,
1809};
1810
1811#define IPXIPX_FEATURES (NETIF_F_SG | \
1812 NETIF_F_FRAGLIST | \
1813 NETIF_F_HIGHDMA | \
1814 NETIF_F_GSO_SOFTWARE | \
1815 NETIF_F_HW_CSUM)
1816
1817/**
1818 * ip6_tnl_dev_setup - setup virtual tunnel device
1819 * @dev: virtual device associated with tunnel
1820 *
1821 * Description:
1822 * Initialize function pointers and device parameters
1823 **/
1824
1825static void ip6_tnl_dev_setup(struct net_device *dev)
1826{
1827 dev->netdev_ops = &ip6_tnl_netdev_ops;
1828 dev->header_ops = &ip_tunnel_header_ops;
1829 dev->needs_free_netdev = true;
1830 dev->priv_destructor = ip6_dev_free;
1831
1832 dev->type = ARPHRD_TUNNEL6;
1833 dev->flags |= IFF_NOARP;
1834 dev->addr_len = sizeof(struct in6_addr);
1835 dev->features |= NETIF_F_LLTX;
1836 netif_keep_dst(dev);
1837
1838 dev->features |= IPXIPX_FEATURES;
1839 dev->hw_features |= IPXIPX_FEATURES;
1840
1841 /* This perm addr will be used as interface identifier by IPv6 */
1842 dev->addr_assign_type = NET_ADDR_RANDOM;
1843 eth_random_addr(dev->perm_addr);
1844}
1845
1846
1847/**
1848 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1849 * @dev: virtual device associated with tunnel
1850 **/
1851
1852static inline int
1853ip6_tnl_dev_init_gen(struct net_device *dev)
1854{
1855 struct ip6_tnl *t = netdev_priv(dev);
1856 int ret;
1857 int t_hlen;
1858
1859 t->dev = dev;
1860 t->net = dev_net(dev);
1861 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1862 if (!dev->tstats)
1863 return -ENOMEM;
1864
1865 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1866 if (ret)
1867 goto free_stats;
1868
1869 ret = gro_cells_init(&t->gro_cells, dev);
1870 if (ret)
1871 goto destroy_dst;
1872
1873 t->tun_hlen = 0;
1874 t->hlen = t->encap_hlen + t->tun_hlen;
1875 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1876
1877 dev->type = ARPHRD_TUNNEL6;
1878 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1879 dev->mtu = ETH_DATA_LEN - t_hlen;
1880 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1881 dev->mtu -= 8;
1882 dev->min_mtu = ETH_MIN_MTU;
1883 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1884
1885 dev_hold(dev);
1886 return 0;
1887
1888destroy_dst:
1889 dst_cache_destroy(&t->dst_cache);
1890free_stats:
1891 free_percpu(dev->tstats);
1892 dev->tstats = NULL;
1893
1894 return ret;
1895}
1896
1897/**
1898 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1899 * @dev: virtual device associated with tunnel
1900 **/
1901
1902static int ip6_tnl_dev_init(struct net_device *dev)
1903{
1904 struct ip6_tnl *t = netdev_priv(dev);
1905 int err = ip6_tnl_dev_init_gen(dev);
1906
1907 if (err)
1908 return err;
1909 ip6_tnl_link_config(t);
1910 if (t->parms.collect_md)
1911 netif_keep_dst(dev);
1912 return 0;
1913}
1914
1915/**
1916 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1917 * @dev: fallback device
1918 *
1919 * Return: 0
1920 **/
1921
1922static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1923{
1924 struct ip6_tnl *t = netdev_priv(dev);
1925 struct net *net = dev_net(dev);
1926 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1927
1928 t->parms.proto = IPPROTO_IPV6;
1929
1930 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1931 return 0;
1932}
1933
1934static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1935 struct netlink_ext_ack *extack)
1936{
1937 u8 proto;
1938
1939 if (!data || !data[IFLA_IPTUN_PROTO])
1940 return 0;
1941
1942 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1943 if (proto != IPPROTO_IPV6 &&
1944 proto != IPPROTO_IPIP &&
1945 proto != 0)
1946 return -EINVAL;
1947
1948 return 0;
1949}
1950
1951static void ip6_tnl_netlink_parms(struct nlattr *data[],
1952 struct __ip6_tnl_parm *parms)
1953{
1954 memset(parms, 0, sizeof(*parms));
1955
1956 if (!data)
1957 return;
1958
1959 if (data[IFLA_IPTUN_LINK])
1960 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1961
1962 if (data[IFLA_IPTUN_LOCAL])
1963 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1964
1965 if (data[IFLA_IPTUN_REMOTE])
1966 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1967
1968 if (data[IFLA_IPTUN_TTL])
1969 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1970
1971 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1972 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1973
1974 if (data[IFLA_IPTUN_FLOWINFO])
1975 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1976
1977 if (data[IFLA_IPTUN_FLAGS])
1978 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1979
1980 if (data[IFLA_IPTUN_PROTO])
1981 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1982
1983 if (data[IFLA_IPTUN_COLLECT_METADATA])
1984 parms->collect_md = true;
1985
1986 if (data[IFLA_IPTUN_FWMARK])
1987 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1988}
1989
1990static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1991 struct ip_tunnel_encap *ipencap)
1992{
1993 bool ret = false;
1994
1995 memset(ipencap, 0, sizeof(*ipencap));
1996
1997 if (!data)
1998 return ret;
1999
2000 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2001 ret = true;
2002 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2003 }
2004
2005 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2006 ret = true;
2007 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2008 }
2009
2010 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2011 ret = true;
2012 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2013 }
2014
2015 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2016 ret = true;
2017 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2018 }
2019
2020 return ret;
2021}
2022
2023static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2024 struct nlattr *tb[], struct nlattr *data[],
2025 struct netlink_ext_ack *extack)
2026{
2027 struct net *net = dev_net(dev);
2028 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2029 struct ip_tunnel_encap ipencap;
2030 struct ip6_tnl *nt, *t;
2031 int err;
2032
2033 nt = netdev_priv(dev);
2034
2035 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2036 err = ip6_tnl_encap_setup(nt, &ipencap);
2037 if (err < 0)
2038 return err;
2039 }
2040
2041 ip6_tnl_netlink_parms(data, &nt->parms);
2042
2043 if (nt->parms.collect_md) {
2044 if (rtnl_dereference(ip6n->collect_md_tun))
2045 return -EEXIST;
2046 } else {
2047 t = ip6_tnl_locate(net, &nt->parms, 0);
2048 if (!IS_ERR(t))
2049 return -EEXIST;
2050 }
2051
2052 err = ip6_tnl_create2(dev);
2053 if (!err && tb[IFLA_MTU])
2054 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2055
2056 return err;
2057}
2058
2059static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2060 struct nlattr *data[],
2061 struct netlink_ext_ack *extack)
2062{
2063 struct ip6_tnl *t = netdev_priv(dev);
2064 struct __ip6_tnl_parm p;
2065 struct net *net = t->net;
2066 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2067 struct ip_tunnel_encap ipencap;
2068
2069 if (dev == ip6n->fb_tnl_dev)
2070 return -EINVAL;
2071
2072 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2073 int err = ip6_tnl_encap_setup(t, &ipencap);
2074
2075 if (err < 0)
2076 return err;
2077 }
2078 ip6_tnl_netlink_parms(data, &p);
2079 if (p.collect_md)
2080 return -EINVAL;
2081
2082 t = ip6_tnl_locate(net, &p, 0);
2083 if (!IS_ERR(t)) {
2084 if (t->dev != dev)
2085 return -EEXIST;
2086 } else
2087 t = netdev_priv(dev);
2088
2089 return ip6_tnl_update(t, &p);
2090}
2091
2092static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2093{
2094 struct net *net = dev_net(dev);
2095 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2096
2097 if (dev != ip6n->fb_tnl_dev)
2098 unregister_netdevice_queue(dev, head);
2099}
2100
2101static size_t ip6_tnl_get_size(const struct net_device *dev)
2102{
2103 return
2104 /* IFLA_IPTUN_LINK */
2105 nla_total_size(4) +
2106 /* IFLA_IPTUN_LOCAL */
2107 nla_total_size(sizeof(struct in6_addr)) +
2108 /* IFLA_IPTUN_REMOTE */
2109 nla_total_size(sizeof(struct in6_addr)) +
2110 /* IFLA_IPTUN_TTL */
2111 nla_total_size(1) +
2112 /* IFLA_IPTUN_ENCAP_LIMIT */
2113 nla_total_size(1) +
2114 /* IFLA_IPTUN_FLOWINFO */
2115 nla_total_size(4) +
2116 /* IFLA_IPTUN_FLAGS */
2117 nla_total_size(4) +
2118 /* IFLA_IPTUN_PROTO */
2119 nla_total_size(1) +
2120 /* IFLA_IPTUN_ENCAP_TYPE */
2121 nla_total_size(2) +
2122 /* IFLA_IPTUN_ENCAP_FLAGS */
2123 nla_total_size(2) +
2124 /* IFLA_IPTUN_ENCAP_SPORT */
2125 nla_total_size(2) +
2126 /* IFLA_IPTUN_ENCAP_DPORT */
2127 nla_total_size(2) +
2128 /* IFLA_IPTUN_COLLECT_METADATA */
2129 nla_total_size(0) +
2130 /* IFLA_IPTUN_FWMARK */
2131 nla_total_size(4) +
2132 0;
2133}
2134
2135static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2136{
2137 struct ip6_tnl *tunnel = netdev_priv(dev);
2138 struct __ip6_tnl_parm *parm = &tunnel->parms;
2139
2140 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2141 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2142 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2143 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2144 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2145 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2146 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2147 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2148 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2149 goto nla_put_failure;
2150
2151 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2152 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2153 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2154 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2155 goto nla_put_failure;
2156
2157 if (parm->collect_md)
2158 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2159 goto nla_put_failure;
2160
2161 return 0;
2162
2163nla_put_failure:
2164 return -EMSGSIZE;
2165}
2166
2167struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2168{
2169 struct ip6_tnl *tunnel = netdev_priv(dev);
2170
2171 return tunnel->net;
2172}
2173EXPORT_SYMBOL(ip6_tnl_get_link_net);
2174
2175static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2176 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2177 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2178 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2179 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2180 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2181 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2182 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2183 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2184 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2185 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2186 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2187 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2188 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2189 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2190};
2191
2192static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2193 .kind = "ip6tnl",
2194 .maxtype = IFLA_IPTUN_MAX,
2195 .policy = ip6_tnl_policy,
2196 .priv_size = sizeof(struct ip6_tnl),
2197 .setup = ip6_tnl_dev_setup,
2198 .validate = ip6_tnl_validate,
2199 .newlink = ip6_tnl_newlink,
2200 .changelink = ip6_tnl_changelink,
2201 .dellink = ip6_tnl_dellink,
2202 .get_size = ip6_tnl_get_size,
2203 .fill_info = ip6_tnl_fill_info,
2204 .get_link_net = ip6_tnl_get_link_net,
2205};
2206
2207static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2208 .handler = ip4ip6_rcv,
2209 .err_handler = ip4ip6_err,
2210 .priority = 1,
2211};
2212
2213static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2214 .handler = ip6ip6_rcv,
2215 .err_handler = ip6ip6_err,
2216 .priority = 1,
2217};
2218
2219static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2220 .handler = mplsip6_rcv,
2221 .err_handler = mplsip6_err,
2222 .priority = 1,
2223};
2224
2225static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2226{
2227 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2228 struct net_device *dev, *aux;
2229 int h;
2230 struct ip6_tnl *t;
2231
2232 for_each_netdev_safe(net, dev, aux)
2233 if (dev->rtnl_link_ops == &ip6_link_ops)
2234 unregister_netdevice_queue(dev, list);
2235
2236 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2237 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2238 while (t) {
2239 /* If dev is in the same netns, it has already
2240 * been added to the list by the previous loop.
2241 */
2242 if (!net_eq(dev_net(t->dev), net))
2243 unregister_netdevice_queue(t->dev, list);
2244 t = rtnl_dereference(t->next);
2245 }
2246 }
2247
2248 t = rtnl_dereference(ip6n->tnls_wc[0]);
2249 while (t) {
2250 /* If dev is in the same netns, it has already
2251 * been added to the list by the previous loop.
2252 */
2253 if (!net_eq(dev_net(t->dev), net))
2254 unregister_netdevice_queue(t->dev, list);
2255 t = rtnl_dereference(t->next);
2256 }
2257}
2258
2259static int __net_init ip6_tnl_init_net(struct net *net)
2260{
2261 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2262 struct ip6_tnl *t = NULL;
2263 int err;
2264
2265 ip6n->tnls[0] = ip6n->tnls_wc;
2266 ip6n->tnls[1] = ip6n->tnls_r_l;
2267
2268 if (!net_has_fallback_tunnels(net))
2269 return 0;
2270 err = -ENOMEM;
2271 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2272 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2273
2274 if (!ip6n->fb_tnl_dev)
2275 goto err_alloc_dev;
2276 dev_net_set(ip6n->fb_tnl_dev, net);
2277 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2278 /* FB netdevice is special: we have one, and only one per netns.
2279 * Allowing to move it to another netns is clearly unsafe.
2280 */
2281 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2282
2283 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2284 if (err < 0)
2285 goto err_register;
2286
2287 err = register_netdev(ip6n->fb_tnl_dev);
2288 if (err < 0)
2289 goto err_register;
2290
2291 t = netdev_priv(ip6n->fb_tnl_dev);
2292
2293 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2294 return 0;
2295
2296err_register:
2297 free_netdev(ip6n->fb_tnl_dev);
2298err_alloc_dev:
2299 return err;
2300}
2301
2302static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2303{
2304 struct net *net;
2305 LIST_HEAD(list);
2306
2307 rtnl_lock();
2308 list_for_each_entry(net, net_list, exit_list)
2309 ip6_tnl_destroy_tunnels(net, &list);
2310 unregister_netdevice_many(&list);
2311 rtnl_unlock();
2312}
2313
2314static struct pernet_operations ip6_tnl_net_ops = {
2315 .init = ip6_tnl_init_net,
2316 .exit_batch = ip6_tnl_exit_batch_net,
2317 .id = &ip6_tnl_net_id,
2318 .size = sizeof(struct ip6_tnl_net),
2319};
2320
2321/**
2322 * ip6_tunnel_init - register protocol and reserve needed resources
2323 *
2324 * Return: 0 on success
2325 **/
2326
2327static int __init ip6_tunnel_init(void)
2328{
2329 int err;
2330
2331 if (!ipv6_mod_enabled())
2332 return -EOPNOTSUPP;
2333
2334 err = register_pernet_device(&ip6_tnl_net_ops);
2335 if (err < 0)
2336 goto out_pernet;
2337
2338 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2339 if (err < 0) {
2340 pr_err("%s: can't register ip4ip6\n", __func__);
2341 goto out_ip4ip6;
2342 }
2343
2344 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2345 if (err < 0) {
2346 pr_err("%s: can't register ip6ip6\n", __func__);
2347 goto out_ip6ip6;
2348 }
2349
2350 if (ip6_tnl_mpls_supported()) {
2351 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2352 if (err < 0) {
2353 pr_err("%s: can't register mplsip6\n", __func__);
2354 goto out_mplsip6;
2355 }
2356 }
2357
2358 err = rtnl_link_register(&ip6_link_ops);
2359 if (err < 0)
2360 goto rtnl_link_failed;
2361
2362 return 0;
2363
2364rtnl_link_failed:
2365 if (ip6_tnl_mpls_supported())
2366 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2367out_mplsip6:
2368 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2369out_ip6ip6:
2370 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2371out_ip4ip6:
2372 unregister_pernet_device(&ip6_tnl_net_ops);
2373out_pernet:
2374 return err;
2375}
2376
2377/**
2378 * ip6_tunnel_cleanup - free resources and unregister protocol
2379 **/
2380
2381static void __exit ip6_tunnel_cleanup(void)
2382{
2383 rtnl_link_unregister(&ip6_link_ops);
2384 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2385 pr_info("%s: can't deregister ip4ip6\n", __func__);
2386
2387 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2388 pr_info("%s: can't deregister ip6ip6\n", __func__);
2389
2390 if (ip6_tnl_mpls_supported() &&
2391 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2392 pr_info("%s: can't deregister mplsip6\n", __func__);
2393 unregister_pernet_device(&ip6_tnl_net_ops);
2394}
2395
2396module_init(ip6_tunnel_init);
2397module_exit(ip6_tunnel_cleanup);