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1/*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21#include <linux/module.h>
22#include <linux/capability.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/sockios.h>
26#include <linux/icmp.h>
27#include <linux/if.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/if_tunnel.h>
31#include <linux/net.h>
32#include <linux/in6.h>
33#include <linux/netdevice.h>
34#include <linux/if_arp.h>
35#include <linux/icmpv6.h>
36#include <linux/init.h>
37#include <linux/route.h>
38#include <linux/rtnetlink.h>
39#include <linux/netfilter_ipv6.h>
40#include <linux/slab.h>
41
42#include <asm/uaccess.h>
43#include <linux/atomic.h>
44
45#include <net/icmp.h>
46#include <net/ip.h>
47#include <net/ipv6.h>
48#include <net/ip6_route.h>
49#include <net/addrconf.h>
50#include <net/ip6_tunnel.h>
51#include <net/xfrm.h>
52#include <net/dsfield.h>
53#include <net/inet_ecn.h>
54#include <net/net_namespace.h>
55#include <net/netns/generic.h>
56
57MODULE_AUTHOR("Ville Nuorvala");
58MODULE_DESCRIPTION("IPv6 tunneling device");
59MODULE_LICENSE("GPL");
60MODULE_ALIAS_NETDEV("ip6tnl0");
61
62#ifdef IP6_TNL_DEBUG
63#define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__)
64#else
65#define IP6_TNL_TRACE(x...) do {;} while(0)
66#endif
67
68#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
69#define IPV6_TCLASS_SHIFT 20
70
71#define HASH_SIZE 32
72
73#define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \
74 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \
75 (HASH_SIZE - 1))
76
77static int ip6_tnl_dev_init(struct net_device *dev);
78static void ip6_tnl_dev_setup(struct net_device *dev);
79
80static int ip6_tnl_net_id __read_mostly;
81struct ip6_tnl_net {
82 /* the IPv6 tunnel fallback device */
83 struct net_device *fb_tnl_dev;
84 /* lists for storing tunnels in use */
85 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
86 struct ip6_tnl __rcu *tnls_wc[1];
87 struct ip6_tnl __rcu **tnls[2];
88};
89
90/* often modified stats are per cpu, other are shared (netdev->stats) */
91struct pcpu_tstats {
92 unsigned long rx_packets;
93 unsigned long rx_bytes;
94 unsigned long tx_packets;
95 unsigned long tx_bytes;
96};
97
98static struct net_device_stats *ip6_get_stats(struct net_device *dev)
99{
100 struct pcpu_tstats sum = { 0 };
101 int i;
102
103 for_each_possible_cpu(i) {
104 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
105
106 sum.rx_packets += tstats->rx_packets;
107 sum.rx_bytes += tstats->rx_bytes;
108 sum.tx_packets += tstats->tx_packets;
109 sum.tx_bytes += tstats->tx_bytes;
110 }
111 dev->stats.rx_packets = sum.rx_packets;
112 dev->stats.rx_bytes = sum.rx_bytes;
113 dev->stats.tx_packets = sum.tx_packets;
114 dev->stats.tx_bytes = sum.tx_bytes;
115 return &dev->stats;
116}
117
118/*
119 * Locking : hash tables are protected by RCU and RTNL
120 */
121
122static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
123{
124 struct dst_entry *dst = t->dst_cache;
125
126 if (dst && dst->obsolete &&
127 dst->ops->check(dst, t->dst_cookie) == NULL) {
128 t->dst_cache = NULL;
129 dst_release(dst);
130 return NULL;
131 }
132
133 return dst;
134}
135
136static inline void ip6_tnl_dst_reset(struct ip6_tnl *t)
137{
138 dst_release(t->dst_cache);
139 t->dst_cache = NULL;
140}
141
142static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
143{
144 struct rt6_info *rt = (struct rt6_info *) dst;
145 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
146 dst_release(t->dst_cache);
147 t->dst_cache = dst;
148}
149
150/**
151 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
152 * @remote: the address of the tunnel exit-point
153 * @local: the address of the tunnel entry-point
154 *
155 * Return:
156 * tunnel matching given end-points if found,
157 * else fallback tunnel if its device is up,
158 * else %NULL
159 **/
160
161#define for_each_ip6_tunnel_rcu(start) \
162 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
163
164static struct ip6_tnl *
165ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
166{
167 unsigned int h0 = HASH(remote);
168 unsigned int h1 = HASH(local);
169 struct ip6_tnl *t;
170 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
171
172 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) {
173 if (ipv6_addr_equal(local, &t->parms.laddr) &&
174 ipv6_addr_equal(remote, &t->parms.raddr) &&
175 (t->dev->flags & IFF_UP))
176 return t;
177 }
178 t = rcu_dereference(ip6n->tnls_wc[0]);
179 if (t && (t->dev->flags & IFF_UP))
180 return t;
181
182 return NULL;
183}
184
185/**
186 * ip6_tnl_bucket - get head of list matching given tunnel parameters
187 * @p: parameters containing tunnel end-points
188 *
189 * Description:
190 * ip6_tnl_bucket() returns the head of the list matching the
191 * &struct in6_addr entries laddr and raddr in @p.
192 *
193 * Return: head of IPv6 tunnel list
194 **/
195
196static struct ip6_tnl __rcu **
197ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct ip6_tnl_parm *p)
198{
199 const struct in6_addr *remote = &p->raddr;
200 const struct in6_addr *local = &p->laddr;
201 unsigned h = 0;
202 int prio = 0;
203
204 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
205 prio = 1;
206 h = HASH(remote) ^ HASH(local);
207 }
208 return &ip6n->tnls[prio][h];
209}
210
211/**
212 * ip6_tnl_link - add tunnel to hash table
213 * @t: tunnel to be added
214 **/
215
216static void
217ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
218{
219 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
220
221 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
222 rcu_assign_pointer(*tp, t);
223}
224
225/**
226 * ip6_tnl_unlink - remove tunnel from hash table
227 * @t: tunnel to be removed
228 **/
229
230static void
231ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
232{
233 struct ip6_tnl __rcu **tp;
234 struct ip6_tnl *iter;
235
236 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
237 (iter = rtnl_dereference(*tp)) != NULL;
238 tp = &iter->next) {
239 if (t == iter) {
240 rcu_assign_pointer(*tp, t->next);
241 break;
242 }
243 }
244}
245
246static void ip6_dev_free(struct net_device *dev)
247{
248 free_percpu(dev->tstats);
249 free_netdev(dev);
250}
251
252/**
253 * ip6_tnl_create() - create a new tunnel
254 * @p: tunnel parameters
255 * @pt: pointer to new tunnel
256 *
257 * Description:
258 * Create tunnel matching given parameters.
259 *
260 * Return:
261 * created tunnel or NULL
262 **/
263
264static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p)
265{
266 struct net_device *dev;
267 struct ip6_tnl *t;
268 char name[IFNAMSIZ];
269 int err;
270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
271
272 if (p->name[0])
273 strlcpy(name, p->name, IFNAMSIZ);
274 else
275 sprintf(name, "ip6tnl%%d");
276
277 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
278 if (dev == NULL)
279 goto failed;
280
281 dev_net_set(dev, net);
282
283 t = netdev_priv(dev);
284 t->parms = *p;
285 err = ip6_tnl_dev_init(dev);
286 if (err < 0)
287 goto failed_free;
288
289 if ((err = register_netdevice(dev)) < 0)
290 goto failed_free;
291
292 dev_hold(dev);
293 ip6_tnl_link(ip6n, t);
294 return t;
295
296failed_free:
297 ip6_dev_free(dev);
298failed:
299 return NULL;
300}
301
302/**
303 * ip6_tnl_locate - find or create tunnel matching given parameters
304 * @p: tunnel parameters
305 * @create: != 0 if allowed to create new tunnel if no match found
306 *
307 * Description:
308 * ip6_tnl_locate() first tries to locate an existing tunnel
309 * based on @parms. If this is unsuccessful, but @create is set a new
310 * tunnel device is created and registered for use.
311 *
312 * Return:
313 * matching tunnel or NULL
314 **/
315
316static struct ip6_tnl *ip6_tnl_locate(struct net *net,
317 struct ip6_tnl_parm *p, int create)
318{
319 const struct in6_addr *remote = &p->raddr;
320 const struct in6_addr *local = &p->laddr;
321 struct ip6_tnl __rcu **tp;
322 struct ip6_tnl *t;
323 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
324
325 for (tp = ip6_tnl_bucket(ip6n, p);
326 (t = rtnl_dereference(*tp)) != NULL;
327 tp = &t->next) {
328 if (ipv6_addr_equal(local, &t->parms.laddr) &&
329 ipv6_addr_equal(remote, &t->parms.raddr))
330 return t;
331 }
332 if (!create)
333 return NULL;
334 return ip6_tnl_create(net, p);
335}
336
337/**
338 * ip6_tnl_dev_uninit - tunnel device uninitializer
339 * @dev: the device to be destroyed
340 *
341 * Description:
342 * ip6_tnl_dev_uninit() removes tunnel from its list
343 **/
344
345static void
346ip6_tnl_dev_uninit(struct net_device *dev)
347{
348 struct ip6_tnl *t = netdev_priv(dev);
349 struct net *net = dev_net(dev);
350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
351
352 if (dev == ip6n->fb_tnl_dev)
353 rcu_assign_pointer(ip6n->tnls_wc[0], NULL);
354 else
355 ip6_tnl_unlink(ip6n, t);
356 ip6_tnl_dst_reset(t);
357 dev_put(dev);
358}
359
360/**
361 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
362 * @skb: received socket buffer
363 *
364 * Return:
365 * 0 if none was found,
366 * else index to encapsulation limit
367 **/
368
369static __u16
370parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw)
371{
372 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
373 __u8 nexthdr = ipv6h->nexthdr;
374 __u16 off = sizeof (*ipv6h);
375
376 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
377 __u16 optlen = 0;
378 struct ipv6_opt_hdr *hdr;
379 if (raw + off + sizeof (*hdr) > skb->data &&
380 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
381 break;
382
383 hdr = (struct ipv6_opt_hdr *) (raw + off);
384 if (nexthdr == NEXTHDR_FRAGMENT) {
385 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
386 if (frag_hdr->frag_off)
387 break;
388 optlen = 8;
389 } else if (nexthdr == NEXTHDR_AUTH) {
390 optlen = (hdr->hdrlen + 2) << 2;
391 } else {
392 optlen = ipv6_optlen(hdr);
393 }
394 if (nexthdr == NEXTHDR_DEST) {
395 __u16 i = off + 2;
396 while (1) {
397 struct ipv6_tlv_tnl_enc_lim *tel;
398
399 /* No more room for encapsulation limit */
400 if (i + sizeof (*tel) > off + optlen)
401 break;
402
403 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
404 /* return index of option if found and valid */
405 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
406 tel->length == 1)
407 return i;
408 /* else jump to next option */
409 if (tel->type)
410 i += tel->length + 2;
411 else
412 i++;
413 }
414 }
415 nexthdr = hdr->nexthdr;
416 off += optlen;
417 }
418 return 0;
419}
420
421/**
422 * ip6_tnl_err - tunnel error handler
423 *
424 * Description:
425 * ip6_tnl_err() should handle errors in the tunnel according
426 * to the specifications in RFC 2473.
427 **/
428
429static int
430ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
431 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
432{
433 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
434 struct ip6_tnl *t;
435 int rel_msg = 0;
436 u8 rel_type = ICMPV6_DEST_UNREACH;
437 u8 rel_code = ICMPV6_ADDR_UNREACH;
438 __u32 rel_info = 0;
439 __u16 len;
440 int err = -ENOENT;
441
442 /* If the packet doesn't contain the original IPv6 header we are
443 in trouble since we might need the source address for further
444 processing of the error. */
445
446 rcu_read_lock();
447 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
448 &ipv6h->saddr)) == NULL)
449 goto out;
450
451 if (t->parms.proto != ipproto && t->parms.proto != 0)
452 goto out;
453
454 err = 0;
455
456 switch (*type) {
457 __u32 teli;
458 struct ipv6_tlv_tnl_enc_lim *tel;
459 __u32 mtu;
460 case ICMPV6_DEST_UNREACH:
461 if (net_ratelimit())
462 printk(KERN_WARNING
463 "%s: Path to destination invalid "
464 "or inactive!\n", t->parms.name);
465 rel_msg = 1;
466 break;
467 case ICMPV6_TIME_EXCEED:
468 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
469 if (net_ratelimit())
470 printk(KERN_WARNING
471 "%s: Too small hop limit or "
472 "routing loop in tunnel!\n",
473 t->parms.name);
474 rel_msg = 1;
475 }
476 break;
477 case ICMPV6_PARAMPROB:
478 teli = 0;
479 if ((*code) == ICMPV6_HDR_FIELD)
480 teli = parse_tlv_tnl_enc_lim(skb, skb->data);
481
482 if (teli && teli == *info - 2) {
483 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
484 if (tel->encap_limit == 0) {
485 if (net_ratelimit())
486 printk(KERN_WARNING
487 "%s: Too small encapsulation "
488 "limit or routing loop in "
489 "tunnel!\n", t->parms.name);
490 rel_msg = 1;
491 }
492 } else if (net_ratelimit()) {
493 printk(KERN_WARNING
494 "%s: Recipient unable to parse tunneled "
495 "packet!\n ", t->parms.name);
496 }
497 break;
498 case ICMPV6_PKT_TOOBIG:
499 mtu = *info - offset;
500 if (mtu < IPV6_MIN_MTU)
501 mtu = IPV6_MIN_MTU;
502 t->dev->mtu = mtu;
503
504 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
505 rel_type = ICMPV6_PKT_TOOBIG;
506 rel_code = 0;
507 rel_info = mtu;
508 rel_msg = 1;
509 }
510 break;
511 }
512
513 *type = rel_type;
514 *code = rel_code;
515 *info = rel_info;
516 *msg = rel_msg;
517
518out:
519 rcu_read_unlock();
520 return err;
521}
522
523static int
524ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
525 u8 type, u8 code, int offset, __be32 info)
526{
527 int rel_msg = 0;
528 u8 rel_type = type;
529 u8 rel_code = code;
530 __u32 rel_info = ntohl(info);
531 int err;
532 struct sk_buff *skb2;
533 const struct iphdr *eiph;
534 struct rtable *rt;
535 struct flowi4 fl4;
536
537 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
538 &rel_msg, &rel_info, offset);
539 if (err < 0)
540 return err;
541
542 if (rel_msg == 0)
543 return 0;
544
545 switch (rel_type) {
546 case ICMPV6_DEST_UNREACH:
547 if (rel_code != ICMPV6_ADDR_UNREACH)
548 return 0;
549 rel_type = ICMP_DEST_UNREACH;
550 rel_code = ICMP_HOST_UNREACH;
551 break;
552 case ICMPV6_PKT_TOOBIG:
553 if (rel_code != 0)
554 return 0;
555 rel_type = ICMP_DEST_UNREACH;
556 rel_code = ICMP_FRAG_NEEDED;
557 break;
558 default:
559 return 0;
560 }
561
562 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
563 return 0;
564
565 skb2 = skb_clone(skb, GFP_ATOMIC);
566 if (!skb2)
567 return 0;
568
569 skb_dst_drop(skb2);
570
571 skb_pull(skb2, offset);
572 skb_reset_network_header(skb2);
573 eiph = ip_hdr(skb2);
574
575 /* Try to guess incoming interface */
576 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
577 eiph->saddr, 0,
578 0, 0,
579 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
580 if (IS_ERR(rt))
581 goto out;
582
583 skb2->dev = rt->dst.dev;
584
585 /* route "incoming" packet */
586 if (rt->rt_flags & RTCF_LOCAL) {
587 ip_rt_put(rt);
588 rt = NULL;
589 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
590 eiph->daddr, eiph->saddr,
591 0, 0,
592 IPPROTO_IPIP,
593 RT_TOS(eiph->tos), 0);
594 if (IS_ERR(rt) ||
595 rt->dst.dev->type != ARPHRD_TUNNEL) {
596 if (!IS_ERR(rt))
597 ip_rt_put(rt);
598 goto out;
599 }
600 skb_dst_set(skb2, &rt->dst);
601 } else {
602 ip_rt_put(rt);
603 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
604 skb2->dev) ||
605 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
606 goto out;
607 }
608
609 /* change mtu on this route */
610 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
611 if (rel_info > dst_mtu(skb_dst(skb2)))
612 goto out;
613
614 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
615 }
616
617 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
618
619out:
620 kfree_skb(skb2);
621 return 0;
622}
623
624static int
625ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
626 u8 type, u8 code, int offset, __be32 info)
627{
628 int rel_msg = 0;
629 u8 rel_type = type;
630 u8 rel_code = code;
631 __u32 rel_info = ntohl(info);
632 int err;
633
634 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
635 &rel_msg, &rel_info, offset);
636 if (err < 0)
637 return err;
638
639 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
640 struct rt6_info *rt;
641 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
642
643 if (!skb2)
644 return 0;
645
646 skb_dst_drop(skb2);
647 skb_pull(skb2, offset);
648 skb_reset_network_header(skb2);
649
650 /* Try to guess incoming interface */
651 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
652 NULL, 0, 0);
653
654 if (rt && rt->rt6i_dev)
655 skb2->dev = rt->rt6i_dev;
656
657 icmpv6_send(skb2, rel_type, rel_code, rel_info);
658
659 if (rt)
660 dst_release(&rt->dst);
661
662 kfree_skb(skb2);
663 }
664
665 return 0;
666}
667
668static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
669 const struct ipv6hdr *ipv6h,
670 struct sk_buff *skb)
671{
672 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
673
674 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
675 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
676
677 if (INET_ECN_is_ce(dsfield))
678 IP_ECN_set_ce(ip_hdr(skb));
679}
680
681static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
682 const struct ipv6hdr *ipv6h,
683 struct sk_buff *skb)
684{
685 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
686 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
687
688 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
689 IP6_ECN_set_ce(ipv6_hdr(skb));
690}
691
692/* called with rcu_read_lock() */
693static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
694{
695 struct ip6_tnl_parm *p = &t->parms;
696 int ret = 0;
697 struct net *net = dev_net(t->dev);
698
699 if (p->flags & IP6_TNL_F_CAP_RCV) {
700 struct net_device *ldev = NULL;
701
702 if (p->link)
703 ldev = dev_get_by_index_rcu(net, p->link);
704
705 if ((ipv6_addr_is_multicast(&p->laddr) ||
706 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
707 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
708 ret = 1;
709
710 }
711 return ret;
712}
713
714/**
715 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
716 * @skb: received socket buffer
717 * @protocol: ethernet protocol ID
718 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
719 *
720 * Return: 0
721 **/
722
723static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
724 __u8 ipproto,
725 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
726 const struct ipv6hdr *ipv6h,
727 struct sk_buff *skb))
728{
729 struct ip6_tnl *t;
730 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
731
732 rcu_read_lock();
733
734 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
735 &ipv6h->daddr)) != NULL) {
736 struct pcpu_tstats *tstats;
737
738 if (t->parms.proto != ipproto && t->parms.proto != 0) {
739 rcu_read_unlock();
740 goto discard;
741 }
742
743 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
744 rcu_read_unlock();
745 goto discard;
746 }
747
748 if (!ip6_tnl_rcv_ctl(t)) {
749 t->dev->stats.rx_dropped++;
750 rcu_read_unlock();
751 goto discard;
752 }
753 secpath_reset(skb);
754 skb->mac_header = skb->network_header;
755 skb_reset_network_header(skb);
756 skb->protocol = htons(protocol);
757 skb->pkt_type = PACKET_HOST;
758 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
759
760 tstats = this_cpu_ptr(t->dev->tstats);
761 tstats->rx_packets++;
762 tstats->rx_bytes += skb->len;
763
764 __skb_tunnel_rx(skb, t->dev);
765
766 dscp_ecn_decapsulate(t, ipv6h, skb);
767
768 netif_rx(skb);
769
770 rcu_read_unlock();
771 return 0;
772 }
773 rcu_read_unlock();
774 return 1;
775
776discard:
777 kfree_skb(skb);
778 return 0;
779}
780
781static int ip4ip6_rcv(struct sk_buff *skb)
782{
783 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
784 ip4ip6_dscp_ecn_decapsulate);
785}
786
787static int ip6ip6_rcv(struct sk_buff *skb)
788{
789 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
790 ip6ip6_dscp_ecn_decapsulate);
791}
792
793struct ipv6_tel_txoption {
794 struct ipv6_txoptions ops;
795 __u8 dst_opt[8];
796};
797
798static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
799{
800 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
801
802 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
803 opt->dst_opt[3] = 1;
804 opt->dst_opt[4] = encap_limit;
805 opt->dst_opt[5] = IPV6_TLV_PADN;
806 opt->dst_opt[6] = 1;
807
808 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
809 opt->ops.opt_nflen = 8;
810}
811
812/**
813 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
814 * @t: the outgoing tunnel device
815 * @hdr: IPv6 header from the incoming packet
816 *
817 * Description:
818 * Avoid trivial tunneling loop by checking that tunnel exit-point
819 * doesn't match source of incoming packet.
820 *
821 * Return:
822 * 1 if conflict,
823 * 0 else
824 **/
825
826static inline int
827ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
828{
829 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
830}
831
832static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
833{
834 struct ip6_tnl_parm *p = &t->parms;
835 int ret = 0;
836 struct net *net = dev_net(t->dev);
837
838 if (p->flags & IP6_TNL_F_CAP_XMIT) {
839 struct net_device *ldev = NULL;
840
841 rcu_read_lock();
842 if (p->link)
843 ldev = dev_get_by_index_rcu(net, p->link);
844
845 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
846 printk(KERN_WARNING
847 "%s xmit: Local address not yet configured!\n",
848 p->name);
849 else if (!ipv6_addr_is_multicast(&p->raddr) &&
850 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
851 printk(KERN_WARNING
852 "%s xmit: Routing loop! "
853 "Remote address found on this node!\n",
854 p->name);
855 else
856 ret = 1;
857 rcu_read_unlock();
858 }
859 return ret;
860}
861/**
862 * ip6_tnl_xmit2 - encapsulate packet and send
863 * @skb: the outgoing socket buffer
864 * @dev: the outgoing tunnel device
865 * @dsfield: dscp code for outer header
866 * @fl: flow of tunneled packet
867 * @encap_limit: encapsulation limit
868 * @pmtu: Path MTU is stored if packet is too big
869 *
870 * Description:
871 * Build new header and do some sanity checks on the packet before sending
872 * it.
873 *
874 * Return:
875 * 0 on success
876 * -1 fail
877 * %-EMSGSIZE message too big. return mtu in this case.
878 **/
879
880static int ip6_tnl_xmit2(struct sk_buff *skb,
881 struct net_device *dev,
882 __u8 dsfield,
883 struct flowi6 *fl6,
884 int encap_limit,
885 __u32 *pmtu)
886{
887 struct net *net = dev_net(dev);
888 struct ip6_tnl *t = netdev_priv(dev);
889 struct net_device_stats *stats = &t->dev->stats;
890 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
891 struct ipv6_tel_txoption opt;
892 struct dst_entry *dst;
893 struct net_device *tdev;
894 int mtu;
895 unsigned int max_headroom = sizeof(struct ipv6hdr);
896 u8 proto;
897 int err = -1;
898 int pkt_len;
899
900 if ((dst = ip6_tnl_dst_check(t)) != NULL)
901 dst_hold(dst);
902 else {
903 dst = ip6_route_output(net, NULL, fl6);
904
905 if (dst->error)
906 goto tx_err_link_failure;
907 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
908 if (IS_ERR(dst)) {
909 err = PTR_ERR(dst);
910 dst = NULL;
911 goto tx_err_link_failure;
912 }
913 }
914
915 tdev = dst->dev;
916
917 if (tdev == dev) {
918 stats->collisions++;
919 if (net_ratelimit())
920 printk(KERN_WARNING
921 "%s: Local routing loop detected!\n",
922 t->parms.name);
923 goto tx_err_dst_release;
924 }
925 mtu = dst_mtu(dst) - sizeof (*ipv6h);
926 if (encap_limit >= 0) {
927 max_headroom += 8;
928 mtu -= 8;
929 }
930 if (mtu < IPV6_MIN_MTU)
931 mtu = IPV6_MIN_MTU;
932 if (skb_dst(skb))
933 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
934 if (skb->len > mtu) {
935 *pmtu = mtu;
936 err = -EMSGSIZE;
937 goto tx_err_dst_release;
938 }
939
940 /*
941 * Okay, now see if we can stuff it in the buffer as-is.
942 */
943 max_headroom += LL_RESERVED_SPACE(tdev);
944
945 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
946 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
947 struct sk_buff *new_skb;
948
949 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
950 goto tx_err_dst_release;
951
952 if (skb->sk)
953 skb_set_owner_w(new_skb, skb->sk);
954 kfree_skb(skb);
955 skb = new_skb;
956 }
957 skb_dst_drop(skb);
958 skb_dst_set(skb, dst_clone(dst));
959
960 skb->transport_header = skb->network_header;
961
962 proto = fl6->flowi6_proto;
963 if (encap_limit >= 0) {
964 init_tel_txopt(&opt, encap_limit);
965 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
966 }
967 skb_push(skb, sizeof(struct ipv6hdr));
968 skb_reset_network_header(skb);
969 ipv6h = ipv6_hdr(skb);
970 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
971 dsfield = INET_ECN_encapsulate(0, dsfield);
972 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
973 ipv6h->hop_limit = t->parms.hop_limit;
974 ipv6h->nexthdr = proto;
975 ipv6_addr_copy(&ipv6h->saddr, &fl6->saddr);
976 ipv6_addr_copy(&ipv6h->daddr, &fl6->daddr);
977 nf_reset(skb);
978 pkt_len = skb->len;
979 err = ip6_local_out(skb);
980
981 if (net_xmit_eval(err) == 0) {
982 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
983
984 tstats->tx_bytes += pkt_len;
985 tstats->tx_packets++;
986 } else {
987 stats->tx_errors++;
988 stats->tx_aborted_errors++;
989 }
990 ip6_tnl_dst_store(t, dst);
991 return 0;
992tx_err_link_failure:
993 stats->tx_carrier_errors++;
994 dst_link_failure(skb);
995tx_err_dst_release:
996 dst_release(dst);
997 return err;
998}
999
1000static inline int
1001ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1002{
1003 struct ip6_tnl *t = netdev_priv(dev);
1004 const struct iphdr *iph = ip_hdr(skb);
1005 int encap_limit = -1;
1006 struct flowi6 fl6;
1007 __u8 dsfield;
1008 __u32 mtu;
1009 int err;
1010
1011 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1012 !ip6_tnl_xmit_ctl(t))
1013 return -1;
1014
1015 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1016 encap_limit = t->parms.encap_limit;
1017
1018 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1019 fl6.flowi6_proto = IPPROTO_IPIP;
1020
1021 dsfield = ipv4_get_dsfield(iph);
1022
1023 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1024 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1025 & IPV6_TCLASS_MASK;
1026
1027 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1028 if (err != 0) {
1029 /* XXX: send ICMP error even if DF is not set. */
1030 if (err == -EMSGSIZE)
1031 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1032 htonl(mtu));
1033 return -1;
1034 }
1035
1036 return 0;
1037}
1038
1039static inline int
1040ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1041{
1042 struct ip6_tnl *t = netdev_priv(dev);
1043 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1044 int encap_limit = -1;
1045 __u16 offset;
1046 struct flowi6 fl6;
1047 __u8 dsfield;
1048 __u32 mtu;
1049 int err;
1050
1051 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1052 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1053 return -1;
1054
1055 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb));
1056 if (offset > 0) {
1057 struct ipv6_tlv_tnl_enc_lim *tel;
1058 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1059 if (tel->encap_limit == 0) {
1060 icmpv6_send(skb, ICMPV6_PARAMPROB,
1061 ICMPV6_HDR_FIELD, offset + 2);
1062 return -1;
1063 }
1064 encap_limit = tel->encap_limit - 1;
1065 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1066 encap_limit = t->parms.encap_limit;
1067
1068 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1069 fl6.flowi6_proto = IPPROTO_IPV6;
1070
1071 dsfield = ipv6_get_dsfield(ipv6h);
1072 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS))
1073 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1074 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
1075 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1076
1077 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1078 if (err != 0) {
1079 if (err == -EMSGSIZE)
1080 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1081 return -1;
1082 }
1083
1084 return 0;
1085}
1086
1087static netdev_tx_t
1088ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1089{
1090 struct ip6_tnl *t = netdev_priv(dev);
1091 struct net_device_stats *stats = &t->dev->stats;
1092 int ret;
1093
1094 switch (skb->protocol) {
1095 case htons(ETH_P_IP):
1096 ret = ip4ip6_tnl_xmit(skb, dev);
1097 break;
1098 case htons(ETH_P_IPV6):
1099 ret = ip6ip6_tnl_xmit(skb, dev);
1100 break;
1101 default:
1102 goto tx_err;
1103 }
1104
1105 if (ret < 0)
1106 goto tx_err;
1107
1108 return NETDEV_TX_OK;
1109
1110tx_err:
1111 stats->tx_errors++;
1112 stats->tx_dropped++;
1113 kfree_skb(skb);
1114 return NETDEV_TX_OK;
1115}
1116
1117static void ip6_tnl_set_cap(struct ip6_tnl *t)
1118{
1119 struct ip6_tnl_parm *p = &t->parms;
1120 int ltype = ipv6_addr_type(&p->laddr);
1121 int rtype = ipv6_addr_type(&p->raddr);
1122
1123 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV);
1124
1125 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1126 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
1127 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
1128 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
1129 if (ltype&IPV6_ADDR_UNICAST)
1130 p->flags |= IP6_TNL_F_CAP_XMIT;
1131 if (rtype&IPV6_ADDR_UNICAST)
1132 p->flags |= IP6_TNL_F_CAP_RCV;
1133 }
1134}
1135
1136static void ip6_tnl_link_config(struct ip6_tnl *t)
1137{
1138 struct net_device *dev = t->dev;
1139 struct ip6_tnl_parm *p = &t->parms;
1140 struct flowi6 *fl6 = &t->fl.u.ip6;
1141
1142 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1143 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1144
1145 /* Set up flowi template */
1146 ipv6_addr_copy(&fl6->saddr, &p->laddr);
1147 ipv6_addr_copy(&fl6->daddr, &p->raddr);
1148 fl6->flowi6_oif = p->link;
1149 fl6->flowlabel = 0;
1150
1151 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1152 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1153 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1154 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1155
1156 ip6_tnl_set_cap(t);
1157
1158 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1159 dev->flags |= IFF_POINTOPOINT;
1160 else
1161 dev->flags &= ~IFF_POINTOPOINT;
1162
1163 dev->iflink = p->link;
1164
1165 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1166 int strict = (ipv6_addr_type(&p->raddr) &
1167 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1168
1169 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1170 &p->raddr, &p->laddr,
1171 p->link, strict);
1172
1173 if (rt == NULL)
1174 return;
1175
1176 if (rt->rt6i_dev) {
1177 dev->hard_header_len = rt->rt6i_dev->hard_header_len +
1178 sizeof (struct ipv6hdr);
1179
1180 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr);
1181 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1182 dev->mtu-=8;
1183
1184 if (dev->mtu < IPV6_MIN_MTU)
1185 dev->mtu = IPV6_MIN_MTU;
1186 }
1187 dst_release(&rt->dst);
1188 }
1189}
1190
1191/**
1192 * ip6_tnl_change - update the tunnel parameters
1193 * @t: tunnel to be changed
1194 * @p: tunnel configuration parameters
1195 *
1196 * Description:
1197 * ip6_tnl_change() updates the tunnel parameters
1198 **/
1199
1200static int
1201ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p)
1202{
1203 ipv6_addr_copy(&t->parms.laddr, &p->laddr);
1204 ipv6_addr_copy(&t->parms.raddr, &p->raddr);
1205 t->parms.flags = p->flags;
1206 t->parms.hop_limit = p->hop_limit;
1207 t->parms.encap_limit = p->encap_limit;
1208 t->parms.flowinfo = p->flowinfo;
1209 t->parms.link = p->link;
1210 t->parms.proto = p->proto;
1211 ip6_tnl_dst_reset(t);
1212 ip6_tnl_link_config(t);
1213 return 0;
1214}
1215
1216/**
1217 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1218 * @dev: virtual device associated with tunnel
1219 * @ifr: parameters passed from userspace
1220 * @cmd: command to be performed
1221 *
1222 * Description:
1223 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1224 * from userspace.
1225 *
1226 * The possible commands are the following:
1227 * %SIOCGETTUNNEL: get tunnel parameters for device
1228 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1229 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1230 * %SIOCDELTUNNEL: delete tunnel
1231 *
1232 * The fallback device "ip6tnl0", created during module
1233 * initialization, can be used for creating other tunnel devices.
1234 *
1235 * Return:
1236 * 0 on success,
1237 * %-EFAULT if unable to copy data to or from userspace,
1238 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1239 * %-EINVAL if passed tunnel parameters are invalid,
1240 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1241 * %-ENODEV if attempting to change or delete a nonexisting device
1242 **/
1243
1244static int
1245ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1246{
1247 int err = 0;
1248 struct ip6_tnl_parm p;
1249 struct ip6_tnl *t = NULL;
1250 struct net *net = dev_net(dev);
1251 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1252
1253 switch (cmd) {
1254 case SIOCGETTUNNEL:
1255 if (dev == ip6n->fb_tnl_dev) {
1256 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1257 err = -EFAULT;
1258 break;
1259 }
1260 t = ip6_tnl_locate(net, &p, 0);
1261 }
1262 if (t == NULL)
1263 t = netdev_priv(dev);
1264 memcpy(&p, &t->parms, sizeof (p));
1265 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1266 err = -EFAULT;
1267 }
1268 break;
1269 case SIOCADDTUNNEL:
1270 case SIOCCHGTUNNEL:
1271 err = -EPERM;
1272 if (!capable(CAP_NET_ADMIN))
1273 break;
1274 err = -EFAULT;
1275 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1276 break;
1277 err = -EINVAL;
1278 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1279 p.proto != 0)
1280 break;
1281 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL);
1282 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1283 if (t != NULL) {
1284 if (t->dev != dev) {
1285 err = -EEXIST;
1286 break;
1287 }
1288 } else
1289 t = netdev_priv(dev);
1290
1291 ip6_tnl_unlink(ip6n, t);
1292 synchronize_net();
1293 err = ip6_tnl_change(t, &p);
1294 ip6_tnl_link(ip6n, t);
1295 netdev_state_change(dev);
1296 }
1297 if (t) {
1298 err = 0;
1299 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p)))
1300 err = -EFAULT;
1301
1302 } else
1303 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1304 break;
1305 case SIOCDELTUNNEL:
1306 err = -EPERM;
1307 if (!capable(CAP_NET_ADMIN))
1308 break;
1309
1310 if (dev == ip6n->fb_tnl_dev) {
1311 err = -EFAULT;
1312 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1313 break;
1314 err = -ENOENT;
1315 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL)
1316 break;
1317 err = -EPERM;
1318 if (t->dev == ip6n->fb_tnl_dev)
1319 break;
1320 dev = t->dev;
1321 }
1322 err = 0;
1323 unregister_netdevice(dev);
1324 break;
1325 default:
1326 err = -EINVAL;
1327 }
1328 return err;
1329}
1330
1331/**
1332 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1333 * @dev: virtual device associated with tunnel
1334 * @new_mtu: the new mtu
1335 *
1336 * Return:
1337 * 0 on success,
1338 * %-EINVAL if mtu too small
1339 **/
1340
1341static int
1342ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1343{
1344 if (new_mtu < IPV6_MIN_MTU) {
1345 return -EINVAL;
1346 }
1347 dev->mtu = new_mtu;
1348 return 0;
1349}
1350
1351
1352static const struct net_device_ops ip6_tnl_netdev_ops = {
1353 .ndo_uninit = ip6_tnl_dev_uninit,
1354 .ndo_start_xmit = ip6_tnl_xmit,
1355 .ndo_do_ioctl = ip6_tnl_ioctl,
1356 .ndo_change_mtu = ip6_tnl_change_mtu,
1357 .ndo_get_stats = ip6_get_stats,
1358};
1359
1360
1361/**
1362 * ip6_tnl_dev_setup - setup virtual tunnel device
1363 * @dev: virtual device associated with tunnel
1364 *
1365 * Description:
1366 * Initialize function pointers and device parameters
1367 **/
1368
1369static void ip6_tnl_dev_setup(struct net_device *dev)
1370{
1371 struct ip6_tnl *t;
1372
1373 dev->netdev_ops = &ip6_tnl_netdev_ops;
1374 dev->destructor = ip6_dev_free;
1375
1376 dev->type = ARPHRD_TUNNEL6;
1377 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1378 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1379 t = netdev_priv(dev);
1380 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1381 dev->mtu-=8;
1382 dev->flags |= IFF_NOARP;
1383 dev->addr_len = sizeof(struct in6_addr);
1384 dev->features |= NETIF_F_NETNS_LOCAL;
1385 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1386}
1387
1388
1389/**
1390 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1391 * @dev: virtual device associated with tunnel
1392 **/
1393
1394static inline int
1395ip6_tnl_dev_init_gen(struct net_device *dev)
1396{
1397 struct ip6_tnl *t = netdev_priv(dev);
1398
1399 t->dev = dev;
1400 strcpy(t->parms.name, dev->name);
1401 dev->tstats = alloc_percpu(struct pcpu_tstats);
1402 if (!dev->tstats)
1403 return -ENOMEM;
1404 return 0;
1405}
1406
1407/**
1408 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1409 * @dev: virtual device associated with tunnel
1410 **/
1411
1412static int ip6_tnl_dev_init(struct net_device *dev)
1413{
1414 struct ip6_tnl *t = netdev_priv(dev);
1415 int err = ip6_tnl_dev_init_gen(dev);
1416
1417 if (err)
1418 return err;
1419 ip6_tnl_link_config(t);
1420 return 0;
1421}
1422
1423/**
1424 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1425 * @dev: fallback device
1426 *
1427 * Return: 0
1428 **/
1429
1430static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1431{
1432 struct ip6_tnl *t = netdev_priv(dev);
1433 struct net *net = dev_net(dev);
1434 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1435 int err = ip6_tnl_dev_init_gen(dev);
1436
1437 if (err)
1438 return err;
1439
1440 t->parms.proto = IPPROTO_IPV6;
1441 dev_hold(dev);
1442 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1443 return 0;
1444}
1445
1446static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1447 .handler = ip4ip6_rcv,
1448 .err_handler = ip4ip6_err,
1449 .priority = 1,
1450};
1451
1452static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1453 .handler = ip6ip6_rcv,
1454 .err_handler = ip6ip6_err,
1455 .priority = 1,
1456};
1457
1458static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
1459{
1460 int h;
1461 struct ip6_tnl *t;
1462 LIST_HEAD(list);
1463
1464 for (h = 0; h < HASH_SIZE; h++) {
1465 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1466 while (t != NULL) {
1467 unregister_netdevice_queue(t->dev, &list);
1468 t = rtnl_dereference(t->next);
1469 }
1470 }
1471
1472 t = rtnl_dereference(ip6n->tnls_wc[0]);
1473 unregister_netdevice_queue(t->dev, &list);
1474 unregister_netdevice_many(&list);
1475}
1476
1477static int __net_init ip6_tnl_init_net(struct net *net)
1478{
1479 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1480 int err;
1481
1482 ip6n->tnls[0] = ip6n->tnls_wc;
1483 ip6n->tnls[1] = ip6n->tnls_r_l;
1484
1485 err = -ENOMEM;
1486 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1487 ip6_tnl_dev_setup);
1488
1489 if (!ip6n->fb_tnl_dev)
1490 goto err_alloc_dev;
1491 dev_net_set(ip6n->fb_tnl_dev, net);
1492
1493 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1494 if (err < 0)
1495 goto err_register;
1496
1497 err = register_netdev(ip6n->fb_tnl_dev);
1498 if (err < 0)
1499 goto err_register;
1500 return 0;
1501
1502err_register:
1503 ip6_dev_free(ip6n->fb_tnl_dev);
1504err_alloc_dev:
1505 return err;
1506}
1507
1508static void __net_exit ip6_tnl_exit_net(struct net *net)
1509{
1510 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1511
1512 rtnl_lock();
1513 ip6_tnl_destroy_tunnels(ip6n);
1514 rtnl_unlock();
1515}
1516
1517static struct pernet_operations ip6_tnl_net_ops = {
1518 .init = ip6_tnl_init_net,
1519 .exit = ip6_tnl_exit_net,
1520 .id = &ip6_tnl_net_id,
1521 .size = sizeof(struct ip6_tnl_net),
1522};
1523
1524/**
1525 * ip6_tunnel_init - register protocol and reserve needed resources
1526 *
1527 * Return: 0 on success
1528 **/
1529
1530static int __init ip6_tunnel_init(void)
1531{
1532 int err;
1533
1534 err = register_pernet_device(&ip6_tnl_net_ops);
1535 if (err < 0)
1536 goto out_pernet;
1537
1538 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1539 if (err < 0) {
1540 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n");
1541 goto out_ip4ip6;
1542 }
1543
1544 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1545 if (err < 0) {
1546 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n");
1547 goto out_ip6ip6;
1548 }
1549
1550 return 0;
1551
1552out_ip6ip6:
1553 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1554out_ip4ip6:
1555 unregister_pernet_device(&ip6_tnl_net_ops);
1556out_pernet:
1557 return err;
1558}
1559
1560/**
1561 * ip6_tunnel_cleanup - free resources and unregister protocol
1562 **/
1563
1564static void __exit ip6_tunnel_cleanup(void)
1565{
1566 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1567 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n");
1568
1569 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1570 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n");
1571
1572 unregister_pernet_device(&ip6_tnl_net_ops);
1573}
1574
1575module_init(ip6_tunnel_init);
1576module_exit(ip6_tunnel_cleanup);
1/*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/module.h>
24#include <linux/capability.h>
25#include <linux/errno.h>
26#include <linux/types.h>
27#include <linux/sockios.h>
28#include <linux/icmp.h>
29#include <linux/if.h>
30#include <linux/in.h>
31#include <linux/ip.h>
32#include <linux/net.h>
33#include <linux/in6.h>
34#include <linux/netdevice.h>
35#include <linux/if_arp.h>
36#include <linux/icmpv6.h>
37#include <linux/init.h>
38#include <linux/route.h>
39#include <linux/rtnetlink.h>
40#include <linux/netfilter_ipv6.h>
41#include <linux/slab.h>
42#include <linux/hash.h>
43#include <linux/etherdevice.h>
44
45#include <asm/uaccess.h>
46#include <linux/atomic.h>
47
48#include <net/icmp.h>
49#include <net/ip.h>
50#include <net/ip_tunnels.h>
51#include <net/ipv6.h>
52#include <net/ip6_route.h>
53#include <net/addrconf.h>
54#include <net/ip6_tunnel.h>
55#include <net/xfrm.h>
56#include <net/dsfield.h>
57#include <net/inet_ecn.h>
58#include <net/net_namespace.h>
59#include <net/netns/generic.h>
60
61MODULE_AUTHOR("Ville Nuorvala");
62MODULE_DESCRIPTION("IPv6 tunneling device");
63MODULE_LICENSE("GPL");
64MODULE_ALIAS_NETDEV("ip6tnl0");
65
66#ifdef IP6_TNL_DEBUG
67#define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
68#else
69#define IP6_TNL_TRACE(x...) do {;} while(0)
70#endif
71
72#define HASH_SIZE_SHIFT 5
73#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
74
75static bool log_ecn_error = true;
76module_param(log_ecn_error, bool, 0644);
77MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
78
79static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
80{
81 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
82
83 return hash_32(hash, HASH_SIZE_SHIFT);
84}
85
86static int ip6_tnl_dev_init(struct net_device *dev);
87static void ip6_tnl_dev_setup(struct net_device *dev);
88static struct rtnl_link_ops ip6_link_ops __read_mostly;
89
90static int ip6_tnl_net_id __read_mostly;
91struct ip6_tnl_net {
92 /* the IPv6 tunnel fallback device */
93 struct net_device *fb_tnl_dev;
94 /* lists for storing tunnels in use */
95 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
96 struct ip6_tnl __rcu *tnls_wc[1];
97 struct ip6_tnl __rcu **tnls[2];
98};
99
100static struct net_device_stats *ip6_get_stats(struct net_device *dev)
101{
102 struct pcpu_sw_netstats tmp, sum = { 0 };
103 int i;
104
105 for_each_possible_cpu(i) {
106 unsigned int start;
107 const struct pcpu_sw_netstats *tstats =
108 per_cpu_ptr(dev->tstats, i);
109
110 do {
111 start = u64_stats_fetch_begin_irq(&tstats->syncp);
112 tmp.rx_packets = tstats->rx_packets;
113 tmp.rx_bytes = tstats->rx_bytes;
114 tmp.tx_packets = tstats->tx_packets;
115 tmp.tx_bytes = tstats->tx_bytes;
116 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
117
118 sum.rx_packets += tmp.rx_packets;
119 sum.rx_bytes += tmp.rx_bytes;
120 sum.tx_packets += tmp.tx_packets;
121 sum.tx_bytes += tmp.tx_bytes;
122 }
123 dev->stats.rx_packets = sum.rx_packets;
124 dev->stats.rx_bytes = sum.rx_bytes;
125 dev->stats.tx_packets = sum.tx_packets;
126 dev->stats.tx_bytes = sum.tx_bytes;
127 return &dev->stats;
128}
129
130/*
131 * Locking : hash tables are protected by RCU and RTNL
132 */
133
134struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
135{
136 struct dst_entry *dst = t->dst_cache;
137
138 if (dst && dst->obsolete &&
139 dst->ops->check(dst, t->dst_cookie) == NULL) {
140 t->dst_cache = NULL;
141 dst_release(dst);
142 return NULL;
143 }
144
145 return dst;
146}
147EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
148
149void ip6_tnl_dst_reset(struct ip6_tnl *t)
150{
151 dst_release(t->dst_cache);
152 t->dst_cache = NULL;
153}
154EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
155
156void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
157{
158 struct rt6_info *rt = (struct rt6_info *) dst;
159 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
160 dst_release(t->dst_cache);
161 t->dst_cache = dst;
162}
163EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
164
165/**
166 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
167 * @remote: the address of the tunnel exit-point
168 * @local: the address of the tunnel entry-point
169 *
170 * Return:
171 * tunnel matching given end-points if found,
172 * else fallback tunnel if its device is up,
173 * else %NULL
174 **/
175
176#define for_each_ip6_tunnel_rcu(start) \
177 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
178
179static struct ip6_tnl *
180ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
181{
182 unsigned int hash = HASH(remote, local);
183 struct ip6_tnl *t;
184 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
185
186 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
187 if (ipv6_addr_equal(local, &t->parms.laddr) &&
188 ipv6_addr_equal(remote, &t->parms.raddr) &&
189 (t->dev->flags & IFF_UP))
190 return t;
191 }
192 t = rcu_dereference(ip6n->tnls_wc[0]);
193 if (t && (t->dev->flags & IFF_UP))
194 return t;
195
196 return NULL;
197}
198
199/**
200 * ip6_tnl_bucket - get head of list matching given tunnel parameters
201 * @p: parameters containing tunnel end-points
202 *
203 * Description:
204 * ip6_tnl_bucket() returns the head of the list matching the
205 * &struct in6_addr entries laddr and raddr in @p.
206 *
207 * Return: head of IPv6 tunnel list
208 **/
209
210static struct ip6_tnl __rcu **
211ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
212{
213 const struct in6_addr *remote = &p->raddr;
214 const struct in6_addr *local = &p->laddr;
215 unsigned int h = 0;
216 int prio = 0;
217
218 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
219 prio = 1;
220 h = HASH(remote, local);
221 }
222 return &ip6n->tnls[prio][h];
223}
224
225/**
226 * ip6_tnl_link - add tunnel to hash table
227 * @t: tunnel to be added
228 **/
229
230static void
231ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
232{
233 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
234
235 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
236 rcu_assign_pointer(*tp, t);
237}
238
239/**
240 * ip6_tnl_unlink - remove tunnel from hash table
241 * @t: tunnel to be removed
242 **/
243
244static void
245ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
246{
247 struct ip6_tnl __rcu **tp;
248 struct ip6_tnl *iter;
249
250 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
251 (iter = rtnl_dereference(*tp)) != NULL;
252 tp = &iter->next) {
253 if (t == iter) {
254 rcu_assign_pointer(*tp, t->next);
255 break;
256 }
257 }
258}
259
260static void ip6_dev_free(struct net_device *dev)
261{
262 free_percpu(dev->tstats);
263 free_netdev(dev);
264}
265
266static int ip6_tnl_create2(struct net_device *dev)
267{
268 struct ip6_tnl *t = netdev_priv(dev);
269 struct net *net = dev_net(dev);
270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
271 int err;
272
273 t = netdev_priv(dev);
274 err = ip6_tnl_dev_init(dev);
275 if (err < 0)
276 goto out;
277
278 err = register_netdevice(dev);
279 if (err < 0)
280 goto out;
281
282 strcpy(t->parms.name, dev->name);
283 dev->rtnl_link_ops = &ip6_link_ops;
284
285 dev_hold(dev);
286 ip6_tnl_link(ip6n, t);
287 return 0;
288
289out:
290 return err;
291}
292
293/**
294 * ip6_tnl_create - create a new tunnel
295 * @p: tunnel parameters
296 * @pt: pointer to new tunnel
297 *
298 * Description:
299 * Create tunnel matching given parameters.
300 *
301 * Return:
302 * created tunnel or NULL
303 **/
304
305static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
306{
307 struct net_device *dev;
308 struct ip6_tnl *t;
309 char name[IFNAMSIZ];
310 int err;
311
312 if (p->name[0])
313 strlcpy(name, p->name, IFNAMSIZ);
314 else
315 sprintf(name, "ip6tnl%%d");
316
317 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
318 if (dev == NULL)
319 goto failed;
320
321 dev_net_set(dev, net);
322
323 t = netdev_priv(dev);
324 t->parms = *p;
325 t->net = dev_net(dev);
326 err = ip6_tnl_create2(dev);
327 if (err < 0)
328 goto failed_free;
329
330 return t;
331
332failed_free:
333 ip6_dev_free(dev);
334failed:
335 return NULL;
336}
337
338/**
339 * ip6_tnl_locate - find or create tunnel matching given parameters
340 * @p: tunnel parameters
341 * @create: != 0 if allowed to create new tunnel if no match found
342 *
343 * Description:
344 * ip6_tnl_locate() first tries to locate an existing tunnel
345 * based on @parms. If this is unsuccessful, but @create is set a new
346 * tunnel device is created and registered for use.
347 *
348 * Return:
349 * matching tunnel or NULL
350 **/
351
352static struct ip6_tnl *ip6_tnl_locate(struct net *net,
353 struct __ip6_tnl_parm *p, int create)
354{
355 const struct in6_addr *remote = &p->raddr;
356 const struct in6_addr *local = &p->laddr;
357 struct ip6_tnl __rcu **tp;
358 struct ip6_tnl *t;
359 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
360
361 for (tp = ip6_tnl_bucket(ip6n, p);
362 (t = rtnl_dereference(*tp)) != NULL;
363 tp = &t->next) {
364 if (ipv6_addr_equal(local, &t->parms.laddr) &&
365 ipv6_addr_equal(remote, &t->parms.raddr))
366 return t;
367 }
368 if (!create)
369 return NULL;
370 return ip6_tnl_create(net, p);
371}
372
373/**
374 * ip6_tnl_dev_uninit - tunnel device uninitializer
375 * @dev: the device to be destroyed
376 *
377 * Description:
378 * ip6_tnl_dev_uninit() removes tunnel from its list
379 **/
380
381static void
382ip6_tnl_dev_uninit(struct net_device *dev)
383{
384 struct ip6_tnl *t = netdev_priv(dev);
385 struct net *net = t->net;
386 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
387
388 if (dev == ip6n->fb_tnl_dev)
389 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
390 else
391 ip6_tnl_unlink(ip6n, t);
392 ip6_tnl_dst_reset(t);
393 dev_put(dev);
394}
395
396/**
397 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
398 * @skb: received socket buffer
399 *
400 * Return:
401 * 0 if none was found,
402 * else index to encapsulation limit
403 **/
404
405__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
406{
407 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
408 __u8 nexthdr = ipv6h->nexthdr;
409 __u16 off = sizeof (*ipv6h);
410
411 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
412 __u16 optlen = 0;
413 struct ipv6_opt_hdr *hdr;
414 if (raw + off + sizeof (*hdr) > skb->data &&
415 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
416 break;
417
418 hdr = (struct ipv6_opt_hdr *) (raw + off);
419 if (nexthdr == NEXTHDR_FRAGMENT) {
420 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
421 if (frag_hdr->frag_off)
422 break;
423 optlen = 8;
424 } else if (nexthdr == NEXTHDR_AUTH) {
425 optlen = (hdr->hdrlen + 2) << 2;
426 } else {
427 optlen = ipv6_optlen(hdr);
428 }
429 if (nexthdr == NEXTHDR_DEST) {
430 __u16 i = off + 2;
431 while (1) {
432 struct ipv6_tlv_tnl_enc_lim *tel;
433
434 /* No more room for encapsulation limit */
435 if (i + sizeof (*tel) > off + optlen)
436 break;
437
438 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
439 /* return index of option if found and valid */
440 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
441 tel->length == 1)
442 return i;
443 /* else jump to next option */
444 if (tel->type)
445 i += tel->length + 2;
446 else
447 i++;
448 }
449 }
450 nexthdr = hdr->nexthdr;
451 off += optlen;
452 }
453 return 0;
454}
455EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
456
457/**
458 * ip6_tnl_err - tunnel error handler
459 *
460 * Description:
461 * ip6_tnl_err() should handle errors in the tunnel according
462 * to the specifications in RFC 2473.
463 **/
464
465static int
466ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
467 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
468{
469 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
470 struct ip6_tnl *t;
471 int rel_msg = 0;
472 u8 rel_type = ICMPV6_DEST_UNREACH;
473 u8 rel_code = ICMPV6_ADDR_UNREACH;
474 __u32 rel_info = 0;
475 __u16 len;
476 int err = -ENOENT;
477
478 /* If the packet doesn't contain the original IPv6 header we are
479 in trouble since we might need the source address for further
480 processing of the error. */
481
482 rcu_read_lock();
483 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
484 &ipv6h->saddr)) == NULL)
485 goto out;
486
487 if (t->parms.proto != ipproto && t->parms.proto != 0)
488 goto out;
489
490 err = 0;
491
492 switch (*type) {
493 __u32 teli;
494 struct ipv6_tlv_tnl_enc_lim *tel;
495 __u32 mtu;
496 case ICMPV6_DEST_UNREACH:
497 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
498 t->parms.name);
499 rel_msg = 1;
500 break;
501 case ICMPV6_TIME_EXCEED:
502 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
503 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
504 t->parms.name);
505 rel_msg = 1;
506 }
507 break;
508 case ICMPV6_PARAMPROB:
509 teli = 0;
510 if ((*code) == ICMPV6_HDR_FIELD)
511 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
512
513 if (teli && teli == *info - 2) {
514 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
515 if (tel->encap_limit == 0) {
516 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
517 t->parms.name);
518 rel_msg = 1;
519 }
520 } else {
521 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
522 t->parms.name);
523 }
524 break;
525 case ICMPV6_PKT_TOOBIG:
526 mtu = *info - offset;
527 if (mtu < IPV6_MIN_MTU)
528 mtu = IPV6_MIN_MTU;
529 t->dev->mtu = mtu;
530
531 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
532 rel_type = ICMPV6_PKT_TOOBIG;
533 rel_code = 0;
534 rel_info = mtu;
535 rel_msg = 1;
536 }
537 break;
538 }
539
540 *type = rel_type;
541 *code = rel_code;
542 *info = rel_info;
543 *msg = rel_msg;
544
545out:
546 rcu_read_unlock();
547 return err;
548}
549
550static int
551ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
552 u8 type, u8 code, int offset, __be32 info)
553{
554 int rel_msg = 0;
555 u8 rel_type = type;
556 u8 rel_code = code;
557 __u32 rel_info = ntohl(info);
558 int err;
559 struct sk_buff *skb2;
560 const struct iphdr *eiph;
561 struct rtable *rt;
562 struct flowi4 fl4;
563
564 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
565 &rel_msg, &rel_info, offset);
566 if (err < 0)
567 return err;
568
569 if (rel_msg == 0)
570 return 0;
571
572 switch (rel_type) {
573 case ICMPV6_DEST_UNREACH:
574 if (rel_code != ICMPV6_ADDR_UNREACH)
575 return 0;
576 rel_type = ICMP_DEST_UNREACH;
577 rel_code = ICMP_HOST_UNREACH;
578 break;
579 case ICMPV6_PKT_TOOBIG:
580 if (rel_code != 0)
581 return 0;
582 rel_type = ICMP_DEST_UNREACH;
583 rel_code = ICMP_FRAG_NEEDED;
584 break;
585 case NDISC_REDIRECT:
586 rel_type = ICMP_REDIRECT;
587 rel_code = ICMP_REDIR_HOST;
588 default:
589 return 0;
590 }
591
592 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
593 return 0;
594
595 skb2 = skb_clone(skb, GFP_ATOMIC);
596 if (!skb2)
597 return 0;
598
599 skb_dst_drop(skb2);
600
601 skb_pull(skb2, offset);
602 skb_reset_network_header(skb2);
603 eiph = ip_hdr(skb2);
604
605 /* Try to guess incoming interface */
606 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
607 eiph->saddr, 0,
608 0, 0,
609 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
610 if (IS_ERR(rt))
611 goto out;
612
613 skb2->dev = rt->dst.dev;
614
615 /* route "incoming" packet */
616 if (rt->rt_flags & RTCF_LOCAL) {
617 ip_rt_put(rt);
618 rt = NULL;
619 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
620 eiph->daddr, eiph->saddr,
621 0, 0,
622 IPPROTO_IPIP,
623 RT_TOS(eiph->tos), 0);
624 if (IS_ERR(rt) ||
625 rt->dst.dev->type != ARPHRD_TUNNEL) {
626 if (!IS_ERR(rt))
627 ip_rt_put(rt);
628 goto out;
629 }
630 skb_dst_set(skb2, &rt->dst);
631 } else {
632 ip_rt_put(rt);
633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
634 skb2->dev) ||
635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
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(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
645 }
646 if (rel_type == ICMP_REDIRECT)
647 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
648
649 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
650
651out:
652 kfree_skb(skb2);
653 return 0;
654}
655
656static int
657ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
658 u8 type, u8 code, int offset, __be32 info)
659{
660 int rel_msg = 0;
661 u8 rel_type = type;
662 u8 rel_code = code;
663 __u32 rel_info = ntohl(info);
664 int err;
665
666 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
667 &rel_msg, &rel_info, offset);
668 if (err < 0)
669 return err;
670
671 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
672 struct rt6_info *rt;
673 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
674
675 if (!skb2)
676 return 0;
677
678 skb_dst_drop(skb2);
679 skb_pull(skb2, offset);
680 skb_reset_network_header(skb2);
681
682 /* Try to guess incoming interface */
683 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
684 NULL, 0, 0);
685
686 if (rt && rt->dst.dev)
687 skb2->dev = rt->dst.dev;
688
689 icmpv6_send(skb2, rel_type, rel_code, rel_info);
690
691 ip6_rt_put(rt);
692
693 kfree_skb(skb2);
694 }
695
696 return 0;
697}
698
699static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
700 const struct ipv6hdr *ipv6h,
701 struct sk_buff *skb)
702{
703 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
704
705 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
706 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
707
708 return IP6_ECN_decapsulate(ipv6h, skb);
709}
710
711static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
712 const struct ipv6hdr *ipv6h,
713 struct sk_buff *skb)
714{
715 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
716 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
717
718 return IP6_ECN_decapsulate(ipv6h, skb);
719}
720
721__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
722 const struct in6_addr *laddr,
723 const struct in6_addr *raddr)
724{
725 struct __ip6_tnl_parm *p = &t->parms;
726 int ltype = ipv6_addr_type(laddr);
727 int rtype = ipv6_addr_type(raddr);
728 __u32 flags = 0;
729
730 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
731 flags = IP6_TNL_F_CAP_PER_PACKET;
732 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
733 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
734 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
735 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
736 if (ltype&IPV6_ADDR_UNICAST)
737 flags |= IP6_TNL_F_CAP_XMIT;
738 if (rtype&IPV6_ADDR_UNICAST)
739 flags |= IP6_TNL_F_CAP_RCV;
740 }
741 return flags;
742}
743EXPORT_SYMBOL(ip6_tnl_get_cap);
744
745/* called with rcu_read_lock() */
746int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
747 const struct in6_addr *laddr,
748 const struct in6_addr *raddr)
749{
750 struct __ip6_tnl_parm *p = &t->parms;
751 int ret = 0;
752 struct net *net = t->net;
753
754 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
755 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
756 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
757 struct net_device *ldev = NULL;
758
759 if (p->link)
760 ldev = dev_get_by_index_rcu(net, p->link);
761
762 if ((ipv6_addr_is_multicast(laddr) ||
763 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
764 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
765 ret = 1;
766 }
767 return ret;
768}
769EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
770
771/**
772 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
773 * @skb: received socket buffer
774 * @protocol: ethernet protocol ID
775 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
776 *
777 * Return: 0
778 **/
779
780static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
781 __u8 ipproto,
782 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
783 const struct ipv6hdr *ipv6h,
784 struct sk_buff *skb))
785{
786 struct ip6_tnl *t;
787 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
788 int err;
789
790 rcu_read_lock();
791
792 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
793 &ipv6h->daddr)) != NULL) {
794 struct pcpu_sw_netstats *tstats;
795
796 if (t->parms.proto != ipproto && t->parms.proto != 0) {
797 rcu_read_unlock();
798 goto discard;
799 }
800
801 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
802 rcu_read_unlock();
803 goto discard;
804 }
805
806 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
807 t->dev->stats.rx_dropped++;
808 rcu_read_unlock();
809 goto discard;
810 }
811 skb->mac_header = skb->network_header;
812 skb_reset_network_header(skb);
813 skb->protocol = htons(protocol);
814 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
815
816 __skb_tunnel_rx(skb, t->dev, t->net);
817
818 err = dscp_ecn_decapsulate(t, ipv6h, skb);
819 if (unlikely(err)) {
820 if (log_ecn_error)
821 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
822 &ipv6h->saddr,
823 ipv6_get_dsfield(ipv6h));
824 if (err > 1) {
825 ++t->dev->stats.rx_frame_errors;
826 ++t->dev->stats.rx_errors;
827 rcu_read_unlock();
828 goto discard;
829 }
830 }
831
832 tstats = this_cpu_ptr(t->dev->tstats);
833 u64_stats_update_begin(&tstats->syncp);
834 tstats->rx_packets++;
835 tstats->rx_bytes += skb->len;
836 u64_stats_update_end(&tstats->syncp);
837
838 netif_rx(skb);
839
840 rcu_read_unlock();
841 return 0;
842 }
843 rcu_read_unlock();
844 return 1;
845
846discard:
847 kfree_skb(skb);
848 return 0;
849}
850
851static int ip4ip6_rcv(struct sk_buff *skb)
852{
853 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
854 ip4ip6_dscp_ecn_decapsulate);
855}
856
857static int ip6ip6_rcv(struct sk_buff *skb)
858{
859 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
860 ip6ip6_dscp_ecn_decapsulate);
861}
862
863struct ipv6_tel_txoption {
864 struct ipv6_txoptions ops;
865 __u8 dst_opt[8];
866};
867
868static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
869{
870 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
871
872 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
873 opt->dst_opt[3] = 1;
874 opt->dst_opt[4] = encap_limit;
875 opt->dst_opt[5] = IPV6_TLV_PADN;
876 opt->dst_opt[6] = 1;
877
878 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
879 opt->ops.opt_nflen = 8;
880}
881
882/**
883 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
884 * @t: the outgoing tunnel device
885 * @hdr: IPv6 header from the incoming packet
886 *
887 * Description:
888 * Avoid trivial tunneling loop by checking that tunnel exit-point
889 * doesn't match source of incoming packet.
890 *
891 * Return:
892 * 1 if conflict,
893 * 0 else
894 **/
895
896static inline bool
897ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
898{
899 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
900}
901
902int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
903{
904 struct __ip6_tnl_parm *p = &t->parms;
905 int ret = 0;
906 struct net *net = t->net;
907
908 if (p->flags & IP6_TNL_F_CAP_XMIT) {
909 struct net_device *ldev = NULL;
910
911 rcu_read_lock();
912 if (p->link)
913 ldev = dev_get_by_index_rcu(net, p->link);
914
915 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
916 pr_warn("%s xmit: Local address not yet configured!\n",
917 p->name);
918 else if (!ipv6_addr_is_multicast(&p->raddr) &&
919 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
920 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
921 p->name);
922 else
923 ret = 1;
924 rcu_read_unlock();
925 }
926 return ret;
927}
928EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
929
930/**
931 * ip6_tnl_xmit2 - encapsulate packet and send
932 * @skb: the outgoing socket buffer
933 * @dev: the outgoing tunnel device
934 * @dsfield: dscp code for outer header
935 * @fl: flow of tunneled packet
936 * @encap_limit: encapsulation limit
937 * @pmtu: Path MTU is stored if packet is too big
938 *
939 * Description:
940 * Build new header and do some sanity checks on the packet before sending
941 * it.
942 *
943 * Return:
944 * 0 on success
945 * -1 fail
946 * %-EMSGSIZE message too big. return mtu in this case.
947 **/
948
949static int ip6_tnl_xmit2(struct sk_buff *skb,
950 struct net_device *dev,
951 __u8 dsfield,
952 struct flowi6 *fl6,
953 int encap_limit,
954 __u32 *pmtu)
955{
956 struct ip6_tnl *t = netdev_priv(dev);
957 struct net *net = t->net;
958 struct net_device_stats *stats = &t->dev->stats;
959 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
960 struct ipv6_tel_txoption opt;
961 struct dst_entry *dst = NULL, *ndst = NULL;
962 struct net_device *tdev;
963 int mtu;
964 unsigned int max_headroom = sizeof(struct ipv6hdr);
965 u8 proto;
966 int err = -1;
967
968 if (!fl6->flowi6_mark)
969 dst = ip6_tnl_dst_check(t);
970 if (!dst) {
971 ndst = ip6_route_output(net, NULL, fl6);
972
973 if (ndst->error)
974 goto tx_err_link_failure;
975 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
976 if (IS_ERR(ndst)) {
977 err = PTR_ERR(ndst);
978 ndst = NULL;
979 goto tx_err_link_failure;
980 }
981 dst = ndst;
982 }
983
984 tdev = dst->dev;
985
986 if (tdev == dev) {
987 stats->collisions++;
988 net_warn_ratelimited("%s: Local routing loop detected!\n",
989 t->parms.name);
990 goto tx_err_dst_release;
991 }
992 mtu = dst_mtu(dst) - sizeof (*ipv6h);
993 if (encap_limit >= 0) {
994 max_headroom += 8;
995 mtu -= 8;
996 }
997 if (mtu < IPV6_MIN_MTU)
998 mtu = IPV6_MIN_MTU;
999 if (skb_dst(skb))
1000 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1001 if (skb->len > mtu) {
1002 *pmtu = mtu;
1003 err = -EMSGSIZE;
1004 goto tx_err_dst_release;
1005 }
1006
1007 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1008
1009 /*
1010 * Okay, now see if we can stuff it in the buffer as-is.
1011 */
1012 max_headroom += LL_RESERVED_SPACE(tdev);
1013
1014 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1015 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1016 struct sk_buff *new_skb;
1017
1018 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
1019 goto tx_err_dst_release;
1020
1021 if (skb->sk)
1022 skb_set_owner_w(new_skb, skb->sk);
1023 consume_skb(skb);
1024 skb = new_skb;
1025 }
1026 if (fl6->flowi6_mark) {
1027 skb_dst_set(skb, dst);
1028 ndst = NULL;
1029 } else {
1030 skb_dst_set_noref(skb, dst);
1031 }
1032 skb->transport_header = skb->network_header;
1033
1034 proto = fl6->flowi6_proto;
1035 if (encap_limit >= 0) {
1036 init_tel_txopt(&opt, encap_limit);
1037 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1038 }
1039
1040 if (likely(!skb->encapsulation)) {
1041 skb_reset_inner_headers(skb);
1042 skb->encapsulation = 1;
1043 }
1044
1045 skb_push(skb, sizeof(struct ipv6hdr));
1046 skb_reset_network_header(skb);
1047 ipv6h = ipv6_hdr(skb);
1048 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
1049 ipv6h->hop_limit = t->parms.hop_limit;
1050 ipv6h->nexthdr = proto;
1051 ipv6h->saddr = fl6->saddr;
1052 ipv6h->daddr = fl6->daddr;
1053 ip6tunnel_xmit(skb, dev);
1054 if (ndst)
1055 ip6_tnl_dst_store(t, ndst);
1056 return 0;
1057tx_err_link_failure:
1058 stats->tx_carrier_errors++;
1059 dst_link_failure(skb);
1060tx_err_dst_release:
1061 dst_release(ndst);
1062 return err;
1063}
1064
1065static inline int
1066ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1067{
1068 struct ip6_tnl *t = netdev_priv(dev);
1069 const struct iphdr *iph = ip_hdr(skb);
1070 int encap_limit = -1;
1071 struct flowi6 fl6;
1072 __u8 dsfield;
1073 __u32 mtu;
1074 int err;
1075
1076 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1077 !ip6_tnl_xmit_ctl(t))
1078 return -1;
1079
1080 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1081 encap_limit = t->parms.encap_limit;
1082
1083 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1084 fl6.flowi6_proto = IPPROTO_IPIP;
1085
1086 dsfield = ipv4_get_dsfield(iph);
1087
1088 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1089 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1090 & IPV6_TCLASS_MASK;
1091 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1092 fl6.flowi6_mark = skb->mark;
1093
1094 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1095 if (err != 0) {
1096 /* XXX: send ICMP error even if DF is not set. */
1097 if (err == -EMSGSIZE)
1098 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1099 htonl(mtu));
1100 return -1;
1101 }
1102
1103 return 0;
1104}
1105
1106static inline int
1107ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1108{
1109 struct ip6_tnl *t = netdev_priv(dev);
1110 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1111 int encap_limit = -1;
1112 __u16 offset;
1113 struct flowi6 fl6;
1114 __u8 dsfield;
1115 __u32 mtu;
1116 int err;
1117
1118 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1119 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1120 return -1;
1121
1122 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1123 if (offset > 0) {
1124 struct ipv6_tlv_tnl_enc_lim *tel;
1125 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1126 if (tel->encap_limit == 0) {
1127 icmpv6_send(skb, ICMPV6_PARAMPROB,
1128 ICMPV6_HDR_FIELD, offset + 2);
1129 return -1;
1130 }
1131 encap_limit = tel->encap_limit - 1;
1132 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1133 encap_limit = t->parms.encap_limit;
1134
1135 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1136 fl6.flowi6_proto = IPPROTO_IPV6;
1137
1138 dsfield = ipv6_get_dsfield(ipv6h);
1139 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1140 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1141 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1142 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1143 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1144 fl6.flowi6_mark = skb->mark;
1145
1146 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1147 if (err != 0) {
1148 if (err == -EMSGSIZE)
1149 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1150 return -1;
1151 }
1152
1153 return 0;
1154}
1155
1156static netdev_tx_t
1157ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1158{
1159 struct ip6_tnl *t = netdev_priv(dev);
1160 struct net_device_stats *stats = &t->dev->stats;
1161 int ret;
1162
1163 switch (skb->protocol) {
1164 case htons(ETH_P_IP):
1165 ret = ip4ip6_tnl_xmit(skb, dev);
1166 break;
1167 case htons(ETH_P_IPV6):
1168 ret = ip6ip6_tnl_xmit(skb, dev);
1169 break;
1170 default:
1171 goto tx_err;
1172 }
1173
1174 if (ret < 0)
1175 goto tx_err;
1176
1177 return NETDEV_TX_OK;
1178
1179tx_err:
1180 stats->tx_errors++;
1181 stats->tx_dropped++;
1182 kfree_skb(skb);
1183 return NETDEV_TX_OK;
1184}
1185
1186static void ip6_tnl_link_config(struct ip6_tnl *t)
1187{
1188 struct net_device *dev = t->dev;
1189 struct __ip6_tnl_parm *p = &t->parms;
1190 struct flowi6 *fl6 = &t->fl.u.ip6;
1191
1192 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1193 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1194
1195 /* Set up flowi template */
1196 fl6->saddr = p->laddr;
1197 fl6->daddr = p->raddr;
1198 fl6->flowi6_oif = p->link;
1199 fl6->flowlabel = 0;
1200
1201 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1202 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1203 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1204 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1205
1206 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1207 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1208
1209 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1210 dev->flags |= IFF_POINTOPOINT;
1211 else
1212 dev->flags &= ~IFF_POINTOPOINT;
1213
1214 dev->iflink = p->link;
1215
1216 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1217 int strict = (ipv6_addr_type(&p->raddr) &
1218 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1219
1220 struct rt6_info *rt = rt6_lookup(t->net,
1221 &p->raddr, &p->laddr,
1222 p->link, strict);
1223
1224 if (rt == NULL)
1225 return;
1226
1227 if (rt->dst.dev) {
1228 dev->hard_header_len = rt->dst.dev->hard_header_len +
1229 sizeof (struct ipv6hdr);
1230
1231 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
1232 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1233 dev->mtu-=8;
1234
1235 if (dev->mtu < IPV6_MIN_MTU)
1236 dev->mtu = IPV6_MIN_MTU;
1237 }
1238 ip6_rt_put(rt);
1239 }
1240}
1241
1242/**
1243 * ip6_tnl_change - update the tunnel parameters
1244 * @t: tunnel to be changed
1245 * @p: tunnel configuration parameters
1246 *
1247 * Description:
1248 * ip6_tnl_change() updates the tunnel parameters
1249 **/
1250
1251static int
1252ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1253{
1254 t->parms.laddr = p->laddr;
1255 t->parms.raddr = p->raddr;
1256 t->parms.flags = p->flags;
1257 t->parms.hop_limit = p->hop_limit;
1258 t->parms.encap_limit = p->encap_limit;
1259 t->parms.flowinfo = p->flowinfo;
1260 t->parms.link = p->link;
1261 t->parms.proto = p->proto;
1262 ip6_tnl_dst_reset(t);
1263 ip6_tnl_link_config(t);
1264 return 0;
1265}
1266
1267static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1268{
1269 struct net *net = t->net;
1270 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1271 int err;
1272
1273 ip6_tnl_unlink(ip6n, t);
1274 synchronize_net();
1275 err = ip6_tnl_change(t, p);
1276 ip6_tnl_link(ip6n, t);
1277 netdev_state_change(t->dev);
1278 return err;
1279}
1280
1281static void
1282ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1283{
1284 p->laddr = u->laddr;
1285 p->raddr = u->raddr;
1286 p->flags = u->flags;
1287 p->hop_limit = u->hop_limit;
1288 p->encap_limit = u->encap_limit;
1289 p->flowinfo = u->flowinfo;
1290 p->link = u->link;
1291 p->proto = u->proto;
1292 memcpy(p->name, u->name, sizeof(u->name));
1293}
1294
1295static void
1296ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1297{
1298 u->laddr = p->laddr;
1299 u->raddr = p->raddr;
1300 u->flags = p->flags;
1301 u->hop_limit = p->hop_limit;
1302 u->encap_limit = p->encap_limit;
1303 u->flowinfo = p->flowinfo;
1304 u->link = p->link;
1305 u->proto = p->proto;
1306 memcpy(u->name, p->name, sizeof(u->name));
1307}
1308
1309/**
1310 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1311 * @dev: virtual device associated with tunnel
1312 * @ifr: parameters passed from userspace
1313 * @cmd: command to be performed
1314 *
1315 * Description:
1316 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1317 * from userspace.
1318 *
1319 * The possible commands are the following:
1320 * %SIOCGETTUNNEL: get tunnel parameters for device
1321 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1322 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1323 * %SIOCDELTUNNEL: delete tunnel
1324 *
1325 * The fallback device "ip6tnl0", created during module
1326 * initialization, can be used for creating other tunnel devices.
1327 *
1328 * Return:
1329 * 0 on success,
1330 * %-EFAULT if unable to copy data to or from userspace,
1331 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1332 * %-EINVAL if passed tunnel parameters are invalid,
1333 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1334 * %-ENODEV if attempting to change or delete a nonexisting device
1335 **/
1336
1337static int
1338ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1339{
1340 int err = 0;
1341 struct ip6_tnl_parm p;
1342 struct __ip6_tnl_parm p1;
1343 struct ip6_tnl *t = netdev_priv(dev);
1344 struct net *net = t->net;
1345 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1346
1347 switch (cmd) {
1348 case SIOCGETTUNNEL:
1349 if (dev == ip6n->fb_tnl_dev) {
1350 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1351 err = -EFAULT;
1352 break;
1353 }
1354 ip6_tnl_parm_from_user(&p1, &p);
1355 t = ip6_tnl_locate(net, &p1, 0);
1356 if (t == NULL)
1357 t = netdev_priv(dev);
1358 } else {
1359 memset(&p, 0, sizeof(p));
1360 }
1361 ip6_tnl_parm_to_user(&p, &t->parms);
1362 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1363 err = -EFAULT;
1364 }
1365 break;
1366 case SIOCADDTUNNEL:
1367 case SIOCCHGTUNNEL:
1368 err = -EPERM;
1369 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1370 break;
1371 err = -EFAULT;
1372 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1373 break;
1374 err = -EINVAL;
1375 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1376 p.proto != 0)
1377 break;
1378 ip6_tnl_parm_from_user(&p1, &p);
1379 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1380 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1381 if (t != NULL) {
1382 if (t->dev != dev) {
1383 err = -EEXIST;
1384 break;
1385 }
1386 } else
1387 t = netdev_priv(dev);
1388
1389 err = ip6_tnl_update(t, &p1);
1390 }
1391 if (t) {
1392 err = 0;
1393 ip6_tnl_parm_to_user(&p, &t->parms);
1394 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1395 err = -EFAULT;
1396
1397 } else
1398 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1399 break;
1400 case SIOCDELTUNNEL:
1401 err = -EPERM;
1402 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1403 break;
1404
1405 if (dev == ip6n->fb_tnl_dev) {
1406 err = -EFAULT;
1407 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1408 break;
1409 err = -ENOENT;
1410 ip6_tnl_parm_from_user(&p1, &p);
1411 t = ip6_tnl_locate(net, &p1, 0);
1412 if (t == NULL)
1413 break;
1414 err = -EPERM;
1415 if (t->dev == ip6n->fb_tnl_dev)
1416 break;
1417 dev = t->dev;
1418 }
1419 err = 0;
1420 unregister_netdevice(dev);
1421 break;
1422 default:
1423 err = -EINVAL;
1424 }
1425 return err;
1426}
1427
1428/**
1429 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1430 * @dev: virtual device associated with tunnel
1431 * @new_mtu: the new mtu
1432 *
1433 * Return:
1434 * 0 on success,
1435 * %-EINVAL if mtu too small
1436 **/
1437
1438static int
1439ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1440{
1441 struct ip6_tnl *tnl = netdev_priv(dev);
1442
1443 if (tnl->parms.proto == IPPROTO_IPIP) {
1444 if (new_mtu < 68)
1445 return -EINVAL;
1446 } else {
1447 if (new_mtu < IPV6_MIN_MTU)
1448 return -EINVAL;
1449 }
1450 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1451 return -EINVAL;
1452 dev->mtu = new_mtu;
1453 return 0;
1454}
1455
1456
1457static const struct net_device_ops ip6_tnl_netdev_ops = {
1458 .ndo_uninit = ip6_tnl_dev_uninit,
1459 .ndo_start_xmit = ip6_tnl_xmit,
1460 .ndo_do_ioctl = ip6_tnl_ioctl,
1461 .ndo_change_mtu = ip6_tnl_change_mtu,
1462 .ndo_get_stats = ip6_get_stats,
1463};
1464
1465
1466/**
1467 * ip6_tnl_dev_setup - setup virtual tunnel device
1468 * @dev: virtual device associated with tunnel
1469 *
1470 * Description:
1471 * Initialize function pointers and device parameters
1472 **/
1473
1474static void ip6_tnl_dev_setup(struct net_device *dev)
1475{
1476 struct ip6_tnl *t;
1477
1478 dev->netdev_ops = &ip6_tnl_netdev_ops;
1479 dev->destructor = ip6_dev_free;
1480
1481 dev->type = ARPHRD_TUNNEL6;
1482 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1483 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1484 t = netdev_priv(dev);
1485 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1486 dev->mtu-=8;
1487 dev->flags |= IFF_NOARP;
1488 dev->addr_len = sizeof(struct in6_addr);
1489 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1490 /* This perm addr will be used as interface identifier by IPv6 */
1491 dev->addr_assign_type = NET_ADDR_RANDOM;
1492 eth_random_addr(dev->perm_addr);
1493}
1494
1495
1496/**
1497 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1498 * @dev: virtual device associated with tunnel
1499 **/
1500
1501static inline int
1502ip6_tnl_dev_init_gen(struct net_device *dev)
1503{
1504 struct ip6_tnl *t = netdev_priv(dev);
1505
1506 t->dev = dev;
1507 t->net = dev_net(dev);
1508 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1509 if (!dev->tstats)
1510 return -ENOMEM;
1511 return 0;
1512}
1513
1514/**
1515 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1516 * @dev: virtual device associated with tunnel
1517 **/
1518
1519static int ip6_tnl_dev_init(struct net_device *dev)
1520{
1521 struct ip6_tnl *t = netdev_priv(dev);
1522 int err = ip6_tnl_dev_init_gen(dev);
1523
1524 if (err)
1525 return err;
1526 ip6_tnl_link_config(t);
1527 return 0;
1528}
1529
1530/**
1531 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1532 * @dev: fallback device
1533 *
1534 * Return: 0
1535 **/
1536
1537static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1538{
1539 struct ip6_tnl *t = netdev_priv(dev);
1540 struct net *net = dev_net(dev);
1541 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1542 int err = ip6_tnl_dev_init_gen(dev);
1543
1544 if (err)
1545 return err;
1546
1547 t->parms.proto = IPPROTO_IPV6;
1548 dev_hold(dev);
1549
1550 ip6_tnl_link_config(t);
1551
1552 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1553 return 0;
1554}
1555
1556static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1557{
1558 u8 proto;
1559
1560 if (!data || !data[IFLA_IPTUN_PROTO])
1561 return 0;
1562
1563 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1564 if (proto != IPPROTO_IPV6 &&
1565 proto != IPPROTO_IPIP &&
1566 proto != 0)
1567 return -EINVAL;
1568
1569 return 0;
1570}
1571
1572static void ip6_tnl_netlink_parms(struct nlattr *data[],
1573 struct __ip6_tnl_parm *parms)
1574{
1575 memset(parms, 0, sizeof(*parms));
1576
1577 if (!data)
1578 return;
1579
1580 if (data[IFLA_IPTUN_LINK])
1581 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1582
1583 if (data[IFLA_IPTUN_LOCAL])
1584 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1585 sizeof(struct in6_addr));
1586
1587 if (data[IFLA_IPTUN_REMOTE])
1588 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1589 sizeof(struct in6_addr));
1590
1591 if (data[IFLA_IPTUN_TTL])
1592 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1593
1594 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1595 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1596
1597 if (data[IFLA_IPTUN_FLOWINFO])
1598 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1599
1600 if (data[IFLA_IPTUN_FLAGS])
1601 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1602
1603 if (data[IFLA_IPTUN_PROTO])
1604 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1605}
1606
1607static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1608 struct nlattr *tb[], struct nlattr *data[])
1609{
1610 struct net *net = dev_net(dev);
1611 struct ip6_tnl *nt;
1612
1613 nt = netdev_priv(dev);
1614 ip6_tnl_netlink_parms(data, &nt->parms);
1615
1616 if (ip6_tnl_locate(net, &nt->parms, 0))
1617 return -EEXIST;
1618
1619 return ip6_tnl_create2(dev);
1620}
1621
1622static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1623 struct nlattr *data[])
1624{
1625 struct ip6_tnl *t = netdev_priv(dev);
1626 struct __ip6_tnl_parm p;
1627 struct net *net = t->net;
1628 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1629
1630 if (dev == ip6n->fb_tnl_dev)
1631 return -EINVAL;
1632
1633 ip6_tnl_netlink_parms(data, &p);
1634
1635 t = ip6_tnl_locate(net, &p, 0);
1636
1637 if (t) {
1638 if (t->dev != dev)
1639 return -EEXIST;
1640 } else
1641 t = netdev_priv(dev);
1642
1643 return ip6_tnl_update(t, &p);
1644}
1645
1646static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1647{
1648 struct net *net = dev_net(dev);
1649 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1650
1651 if (dev != ip6n->fb_tnl_dev)
1652 unregister_netdevice_queue(dev, head);
1653}
1654
1655static size_t ip6_tnl_get_size(const struct net_device *dev)
1656{
1657 return
1658 /* IFLA_IPTUN_LINK */
1659 nla_total_size(4) +
1660 /* IFLA_IPTUN_LOCAL */
1661 nla_total_size(sizeof(struct in6_addr)) +
1662 /* IFLA_IPTUN_REMOTE */
1663 nla_total_size(sizeof(struct in6_addr)) +
1664 /* IFLA_IPTUN_TTL */
1665 nla_total_size(1) +
1666 /* IFLA_IPTUN_ENCAP_LIMIT */
1667 nla_total_size(1) +
1668 /* IFLA_IPTUN_FLOWINFO */
1669 nla_total_size(4) +
1670 /* IFLA_IPTUN_FLAGS */
1671 nla_total_size(4) +
1672 /* IFLA_IPTUN_PROTO */
1673 nla_total_size(1) +
1674 0;
1675}
1676
1677static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1678{
1679 struct ip6_tnl *tunnel = netdev_priv(dev);
1680 struct __ip6_tnl_parm *parm = &tunnel->parms;
1681
1682 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1683 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1684 &parm->laddr) ||
1685 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1686 &parm->raddr) ||
1687 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1688 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1689 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1690 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1691 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1692 goto nla_put_failure;
1693 return 0;
1694
1695nla_put_failure:
1696 return -EMSGSIZE;
1697}
1698
1699static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1700 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1701 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1702 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1703 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1704 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1705 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1706 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1707 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1708};
1709
1710static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1711 .kind = "ip6tnl",
1712 .maxtype = IFLA_IPTUN_MAX,
1713 .policy = ip6_tnl_policy,
1714 .priv_size = sizeof(struct ip6_tnl),
1715 .setup = ip6_tnl_dev_setup,
1716 .validate = ip6_tnl_validate,
1717 .newlink = ip6_tnl_newlink,
1718 .changelink = ip6_tnl_changelink,
1719 .dellink = ip6_tnl_dellink,
1720 .get_size = ip6_tnl_get_size,
1721 .fill_info = ip6_tnl_fill_info,
1722};
1723
1724static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1725 .handler = ip4ip6_rcv,
1726 .err_handler = ip4ip6_err,
1727 .priority = 1,
1728};
1729
1730static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1731 .handler = ip6ip6_rcv,
1732 .err_handler = ip6ip6_err,
1733 .priority = 1,
1734};
1735
1736static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1737{
1738 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1739 struct net_device *dev, *aux;
1740 int h;
1741 struct ip6_tnl *t;
1742 LIST_HEAD(list);
1743
1744 for_each_netdev_safe(net, dev, aux)
1745 if (dev->rtnl_link_ops == &ip6_link_ops)
1746 unregister_netdevice_queue(dev, &list);
1747
1748 for (h = 0; h < HASH_SIZE; h++) {
1749 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1750 while (t != NULL) {
1751 /* If dev is in the same netns, it has already
1752 * been added to the list by the previous loop.
1753 */
1754 if (!net_eq(dev_net(t->dev), net))
1755 unregister_netdevice_queue(t->dev, &list);
1756 t = rtnl_dereference(t->next);
1757 }
1758 }
1759
1760 unregister_netdevice_many(&list);
1761}
1762
1763static int __net_init ip6_tnl_init_net(struct net *net)
1764{
1765 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1766 struct ip6_tnl *t = NULL;
1767 int err;
1768
1769 ip6n->tnls[0] = ip6n->tnls_wc;
1770 ip6n->tnls[1] = ip6n->tnls_r_l;
1771
1772 err = -ENOMEM;
1773 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1774 ip6_tnl_dev_setup);
1775
1776 if (!ip6n->fb_tnl_dev)
1777 goto err_alloc_dev;
1778 dev_net_set(ip6n->fb_tnl_dev, net);
1779 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1780 /* FB netdevice is special: we have one, and only one per netns.
1781 * Allowing to move it to another netns is clearly unsafe.
1782 */
1783 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1784
1785 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1786 if (err < 0)
1787 goto err_register;
1788
1789 err = register_netdev(ip6n->fb_tnl_dev);
1790 if (err < 0)
1791 goto err_register;
1792
1793 t = netdev_priv(ip6n->fb_tnl_dev);
1794
1795 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1796 return 0;
1797
1798err_register:
1799 ip6_dev_free(ip6n->fb_tnl_dev);
1800err_alloc_dev:
1801 return err;
1802}
1803
1804static void __net_exit ip6_tnl_exit_net(struct net *net)
1805{
1806 rtnl_lock();
1807 ip6_tnl_destroy_tunnels(net);
1808 rtnl_unlock();
1809}
1810
1811static struct pernet_operations ip6_tnl_net_ops = {
1812 .init = ip6_tnl_init_net,
1813 .exit = ip6_tnl_exit_net,
1814 .id = &ip6_tnl_net_id,
1815 .size = sizeof(struct ip6_tnl_net),
1816};
1817
1818/**
1819 * ip6_tunnel_init - register protocol and reserve needed resources
1820 *
1821 * Return: 0 on success
1822 **/
1823
1824static int __init ip6_tunnel_init(void)
1825{
1826 int err;
1827
1828 err = register_pernet_device(&ip6_tnl_net_ops);
1829 if (err < 0)
1830 goto out_pernet;
1831
1832 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1833 if (err < 0) {
1834 pr_err("%s: can't register ip4ip6\n", __func__);
1835 goto out_ip4ip6;
1836 }
1837
1838 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1839 if (err < 0) {
1840 pr_err("%s: can't register ip6ip6\n", __func__);
1841 goto out_ip6ip6;
1842 }
1843 err = rtnl_link_register(&ip6_link_ops);
1844 if (err < 0)
1845 goto rtnl_link_failed;
1846
1847 return 0;
1848
1849rtnl_link_failed:
1850 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1851out_ip6ip6:
1852 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1853out_ip4ip6:
1854 unregister_pernet_device(&ip6_tnl_net_ops);
1855out_pernet:
1856 return err;
1857}
1858
1859/**
1860 * ip6_tunnel_cleanup - free resources and unregister protocol
1861 **/
1862
1863static void __exit ip6_tunnel_cleanup(void)
1864{
1865 rtnl_link_unregister(&ip6_link_ops);
1866 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1867 pr_info("%s: can't deregister ip4ip6\n", __func__);
1868
1869 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1870 pr_info("%s: can't deregister ip6ip6\n", __func__);
1871
1872 unregister_pernet_device(&ip6_tnl_net_ops);
1873}
1874
1875module_init(ip6_tunnel_init);
1876module_exit(ip6_tunnel_cleanup);