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Linux 3.7.4
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blobcb7e2ded6f08cce17f8fb11a7e7e119e8564d661
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/if_tunnel.h>
33 #include <linux/net.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/if_arp.h>
37 #include <linux/icmpv6.h>
38 #include <linux/init.h>
39 #include <linux/route.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/netfilter_ipv6.h>
42 #include <linux/slab.h>
43 #include <linux/hash.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/ipv6.h>
51 #include <net/ip6_route.h>
52 #include <net/addrconf.h>
53 #include <net/ip6_tunnel.h>
54 #include <net/xfrm.h>
55 #include <net/dsfield.h>
56 #include <net/inet_ecn.h>
57 #include <net/net_namespace.h>
58 #include <net/netns/generic.h>
59
60 MODULE_AUTHOR("Ville Nuorvala");
61 MODULE_DESCRIPTION("IPv6 tunneling device");
62 MODULE_LICENSE("GPL");
63 MODULE_ALIAS_NETDEV("ip6tnl0");
64
65 #ifdef IP6_TNL_DEBUG
66 #define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
67 #else
68 #define IP6_TNL_TRACE(x...) do {;} while(0)
69 #endif
70
71 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
72 #define IPV6_TCLASS_SHIFT 20
73
74 #define HASH_SIZE_SHIFT 5
75 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
76
77 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
78 {
79 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
80
81 return hash_32(hash, HASH_SIZE_SHIFT);
82 }
83
84 static int ip6_tnl_dev_init(struct net_device *dev);
85 static void ip6_tnl_dev_setup(struct net_device *dev);
86
87 static int ip6_tnl_net_id __read_mostly;
88 struct ip6_tnl_net {
89 /* the IPv6 tunnel fallback device */
90 struct net_device *fb_tnl_dev;
91 /* lists for storing tunnels in use */
92 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
93 struct ip6_tnl __rcu *tnls_wc[1];
94 struct ip6_tnl __rcu **tnls[2];
95 };
96
97 /* often modified stats are per cpu, other are shared (netdev->stats) */
98 struct pcpu_tstats {
99 unsigned long rx_packets;
100 unsigned long rx_bytes;
101 unsigned long tx_packets;
102 unsigned long tx_bytes;
103 } __attribute__((aligned(4*sizeof(unsigned long))));
104
105 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
106 {
107 struct pcpu_tstats sum = { 0 };
108 int i;
109
110 for_each_possible_cpu(i) {
111 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
112
113 sum.rx_packets += tstats->rx_packets;
114 sum.rx_bytes += tstats->rx_bytes;
115 sum.tx_packets += tstats->tx_packets;
116 sum.tx_bytes += tstats->tx_bytes;
117 }
118 dev->stats.rx_packets = sum.rx_packets;
119 dev->stats.rx_bytes = sum.rx_bytes;
120 dev->stats.tx_packets = sum.tx_packets;
121 dev->stats.tx_bytes = sum.tx_bytes;
122 return &dev->stats;
123 }
124
125 /*
126 * Locking : hash tables are protected by RCU and RTNL
127 */
128
129 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t)
130 {
131 struct dst_entry *dst = t->dst_cache;
132
133 if (dst && dst->obsolete &&
134 dst->ops->check(dst, t->dst_cookie) == NULL) {
135 t->dst_cache = NULL;
136 dst_release(dst);
137 return NULL;
138 }
139
140 return dst;
141 }
142 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
143
144 void ip6_tnl_dst_reset(struct ip6_tnl *t)
145 {
146 dst_release(t->dst_cache);
147 t->dst_cache = NULL;
148 }
149 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
150
151 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst)
152 {
153 struct rt6_info *rt = (struct rt6_info *) dst;
154 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
155 dst_release(t->dst_cache);
156 t->dst_cache = dst;
157 }
158 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store);
159
160 /**
161 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
162 * @remote: the address of the tunnel exit-point
163 * @local: the address of the tunnel entry-point
164 *
165 * Return:
166 * tunnel matching given end-points if found,
167 * else fallback tunnel if its device is up,
168 * else %NULL
169 **/
170
171 #define for_each_ip6_tunnel_rcu(start) \
172 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
173
174 static struct ip6_tnl *
175 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
176 {
177 unsigned int hash = HASH(remote, local);
178 struct ip6_tnl *t;
179 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
180
181 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
182 if (ipv6_addr_equal(local, &t->parms.laddr) &&
183 ipv6_addr_equal(remote, &t->parms.raddr) &&
184 (t->dev->flags & IFF_UP))
185 return t;
186 }
187 t = rcu_dereference(ip6n->tnls_wc[0]);
188 if (t && (t->dev->flags & IFF_UP))
189 return t;
190
191 return NULL;
192 }
193
194 /**
195 * ip6_tnl_bucket - get head of list matching given tunnel parameters
196 * @p: parameters containing tunnel end-points
197 *
198 * Description:
199 * ip6_tnl_bucket() returns the head of the list matching the
200 * &struct in6_addr entries laddr and raddr in @p.
201 *
202 * Return: head of IPv6 tunnel list
203 **/
204
205 static struct ip6_tnl __rcu **
206 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
207 {
208 const struct in6_addr *remote = &p->raddr;
209 const struct in6_addr *local = &p->laddr;
210 unsigned int h = 0;
211 int prio = 0;
212
213 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
214 prio = 1;
215 h = HASH(remote, local);
216 }
217 return &ip6n->tnls[prio][h];
218 }
219
220 /**
221 * ip6_tnl_link - add tunnel to hash table
222 * @t: tunnel to be added
223 **/
224
225 static void
226 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
227 {
228 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
229
230 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
231 rcu_assign_pointer(*tp, t);
232 }
233
234 /**
235 * ip6_tnl_unlink - remove tunnel from hash table
236 * @t: tunnel to be removed
237 **/
238
239 static void
240 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
241 {
242 struct ip6_tnl __rcu **tp;
243 struct ip6_tnl *iter;
244
245 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
246 (iter = rtnl_dereference(*tp)) != NULL;
247 tp = &iter->next) {
248 if (t == iter) {
249 rcu_assign_pointer(*tp, t->next);
250 break;
251 }
252 }
253 }
254
255 static void ip6_dev_free(struct net_device *dev)
256 {
257 free_percpu(dev->tstats);
258 free_netdev(dev);
259 }
260
261 /**
262 * ip6_tnl_create - create a new tunnel
263 * @p: tunnel parameters
264 * @pt: pointer to new tunnel
265 *
266 * Description:
267 * Create tunnel matching given parameters.
268 *
269 * Return:
270 * created tunnel or NULL
271 **/
272
273 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
274 {
275 struct net_device *dev;
276 struct ip6_tnl *t;
277 char name[IFNAMSIZ];
278 int err;
279 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
280
281 if (p->name[0])
282 strlcpy(name, p->name, IFNAMSIZ);
283 else
284 sprintf(name, "ip6tnl%%d");
285
286 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup);
287 if (dev == NULL)
288 goto failed;
289
290 dev_net_set(dev, net);
291
292 t = netdev_priv(dev);
293 t->parms = *p;
294 err = ip6_tnl_dev_init(dev);
295 if (err < 0)
296 goto failed_free;
297
298 if ((err = register_netdevice(dev)) < 0)
299 goto failed_free;
300
301 strcpy(t->parms.name, dev->name);
302
303 dev_hold(dev);
304 ip6_tnl_link(ip6n, t);
305 return t;
306
307 failed_free:
308 ip6_dev_free(dev);
309 failed:
310 return NULL;
311 }
312
313 /**
314 * ip6_tnl_locate - find or create tunnel matching given parameters
315 * @p: tunnel parameters
316 * @create: != 0 if allowed to create new tunnel if no match found
317 *
318 * Description:
319 * ip6_tnl_locate() first tries to locate an existing tunnel
320 * based on @parms. If this is unsuccessful, but @create is set a new
321 * tunnel device is created and registered for use.
322 *
323 * Return:
324 * matching tunnel or NULL
325 **/
326
327 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
328 struct __ip6_tnl_parm *p, int create)
329 {
330 const struct in6_addr *remote = &p->raddr;
331 const struct in6_addr *local = &p->laddr;
332 struct ip6_tnl __rcu **tp;
333 struct ip6_tnl *t;
334 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
335
336 for (tp = ip6_tnl_bucket(ip6n, p);
337 (t = rtnl_dereference(*tp)) != NULL;
338 tp = &t->next) {
339 if (ipv6_addr_equal(local, &t->parms.laddr) &&
340 ipv6_addr_equal(remote, &t->parms.raddr))
341 return t;
342 }
343 if (!create)
344 return NULL;
345 return ip6_tnl_create(net, p);
346 }
347
348 /**
349 * ip6_tnl_dev_uninit - tunnel device uninitializer
350 * @dev: the device to be destroyed
351 *
352 * Description:
353 * ip6_tnl_dev_uninit() removes tunnel from its list
354 **/
355
356 static void
357 ip6_tnl_dev_uninit(struct net_device *dev)
358 {
359 struct ip6_tnl *t = netdev_priv(dev);
360 struct net *net = dev_net(dev);
361 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
362
363 if (dev == ip6n->fb_tnl_dev)
364 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
365 else
366 ip6_tnl_unlink(ip6n, t);
367 ip6_tnl_dst_reset(t);
368 dev_put(dev);
369 }
370
371 /**
372 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
373 * @skb: received socket buffer
374 *
375 * Return:
376 * 0 if none was found,
377 * else index to encapsulation limit
378 **/
379
380 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
381 {
382 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
383 __u8 nexthdr = ipv6h->nexthdr;
384 __u16 off = sizeof (*ipv6h);
385
386 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
387 __u16 optlen = 0;
388 struct ipv6_opt_hdr *hdr;
389 if (raw + off + sizeof (*hdr) > skb->data &&
390 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
391 break;
392
393 hdr = (struct ipv6_opt_hdr *) (raw + off);
394 if (nexthdr == NEXTHDR_FRAGMENT) {
395 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
396 if (frag_hdr->frag_off)
397 break;
398 optlen = 8;
399 } else if (nexthdr == NEXTHDR_AUTH) {
400 optlen = (hdr->hdrlen + 2) << 2;
401 } else {
402 optlen = ipv6_optlen(hdr);
403 }
404 if (nexthdr == NEXTHDR_DEST) {
405 __u16 i = off + 2;
406 while (1) {
407 struct ipv6_tlv_tnl_enc_lim *tel;
408
409 /* No more room for encapsulation limit */
410 if (i + sizeof (*tel) > off + optlen)
411 break;
412
413 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
414 /* return index of option if found and valid */
415 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
416 tel->length == 1)
417 return i;
418 /* else jump to next option */
419 if (tel->type)
420 i += tel->length + 2;
421 else
422 i++;
423 }
424 }
425 nexthdr = hdr->nexthdr;
426 off += optlen;
427 }
428 return 0;
429 }
430 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
431
432 /**
433 * ip6_tnl_err - tunnel error handler
434 *
435 * Description:
436 * ip6_tnl_err() should handle errors in the tunnel according
437 * to the specifications in RFC 2473.
438 **/
439
440 static int
441 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
442 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
443 {
444 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
445 struct ip6_tnl *t;
446 int rel_msg = 0;
447 u8 rel_type = ICMPV6_DEST_UNREACH;
448 u8 rel_code = ICMPV6_ADDR_UNREACH;
449 __u32 rel_info = 0;
450 __u16 len;
451 int err = -ENOENT;
452
453 /* If the packet doesn't contain the original IPv6 header we are
454 in trouble since we might need the source address for further
455 processing of the error. */
456
457 rcu_read_lock();
458 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr,
459 &ipv6h->saddr)) == NULL)
460 goto out;
461
462 if (t->parms.proto != ipproto && t->parms.proto != 0)
463 goto out;
464
465 err = 0;
466
467 switch (*type) {
468 __u32 teli;
469 struct ipv6_tlv_tnl_enc_lim *tel;
470 __u32 mtu;
471 case ICMPV6_DEST_UNREACH:
472 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
473 t->parms.name);
474 rel_msg = 1;
475 break;
476 case ICMPV6_TIME_EXCEED:
477 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
478 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
479 t->parms.name);
480 rel_msg = 1;
481 }
482 break;
483 case ICMPV6_PARAMPROB:
484 teli = 0;
485 if ((*code) == ICMPV6_HDR_FIELD)
486 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
487
488 if (teli && teli == *info - 2) {
489 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
490 if (tel->encap_limit == 0) {
491 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
492 t->parms.name);
493 rel_msg = 1;
494 }
495 } else {
496 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
497 t->parms.name);
498 }
499 break;
500 case ICMPV6_PKT_TOOBIG:
501 mtu = *info - offset;
502 if (mtu < IPV6_MIN_MTU)
503 mtu = IPV6_MIN_MTU;
504 t->dev->mtu = mtu;
505
506 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) {
507 rel_type = ICMPV6_PKT_TOOBIG;
508 rel_code = 0;
509 rel_info = mtu;
510 rel_msg = 1;
511 }
512 break;
513 }
514
515 *type = rel_type;
516 *code = rel_code;
517 *info = rel_info;
518 *msg = rel_msg;
519
520 out:
521 rcu_read_unlock();
522 return err;
523 }
524
525 static int
526 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
527 u8 type, u8 code, int offset, __be32 info)
528 {
529 int rel_msg = 0;
530 u8 rel_type = type;
531 u8 rel_code = code;
532 __u32 rel_info = ntohl(info);
533 int err;
534 struct sk_buff *skb2;
535 const struct iphdr *eiph;
536 struct rtable *rt;
537 struct flowi4 fl4;
538
539 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
540 &rel_msg, &rel_info, offset);
541 if (err < 0)
542 return err;
543
544 if (rel_msg == 0)
545 return 0;
546
547 switch (rel_type) {
548 case ICMPV6_DEST_UNREACH:
549 if (rel_code != ICMPV6_ADDR_UNREACH)
550 return 0;
551 rel_type = ICMP_DEST_UNREACH;
552 rel_code = ICMP_HOST_UNREACH;
553 break;
554 case ICMPV6_PKT_TOOBIG:
555 if (rel_code != 0)
556 return 0;
557 rel_type = ICMP_DEST_UNREACH;
558 rel_code = ICMP_FRAG_NEEDED;
559 break;
560 case NDISC_REDIRECT:
561 rel_type = ICMP_REDIRECT;
562 rel_code = ICMP_REDIR_HOST;
563 default:
564 return 0;
565 }
566
567 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
568 return 0;
569
570 skb2 = skb_clone(skb, GFP_ATOMIC);
571 if (!skb2)
572 return 0;
573
574 skb_dst_drop(skb2);
575
576 skb_pull(skb2, offset);
577 skb_reset_network_header(skb2);
578 eiph = ip_hdr(skb2);
579
580 /* Try to guess incoming interface */
581 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
582 eiph->saddr, 0,
583 0, 0,
584 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
585 if (IS_ERR(rt))
586 goto out;
587
588 skb2->dev = rt->dst.dev;
589
590 /* route "incoming" packet */
591 if (rt->rt_flags & RTCF_LOCAL) {
592 ip_rt_put(rt);
593 rt = NULL;
594 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
595 eiph->daddr, eiph->saddr,
596 0, 0,
597 IPPROTO_IPIP,
598 RT_TOS(eiph->tos), 0);
599 if (IS_ERR(rt) ||
600 rt->dst.dev->type != ARPHRD_TUNNEL) {
601 if (!IS_ERR(rt))
602 ip_rt_put(rt);
603 goto out;
604 }
605 skb_dst_set(skb2, &rt->dst);
606 } else {
607 ip_rt_put(rt);
608 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
609 skb2->dev) ||
610 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
611 goto out;
612 }
613
614 /* change mtu on this route */
615 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
616 if (rel_info > dst_mtu(skb_dst(skb2)))
617 goto out;
618
619 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
620 }
621 if (rel_type == ICMP_REDIRECT)
622 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
623
624 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
625
626 out:
627 kfree_skb(skb2);
628 return 0;
629 }
630
631 static int
632 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
633 u8 type, u8 code, int offset, __be32 info)
634 {
635 int rel_msg = 0;
636 u8 rel_type = type;
637 u8 rel_code = code;
638 __u32 rel_info = ntohl(info);
639 int err;
640
641 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
642 &rel_msg, &rel_info, offset);
643 if (err < 0)
644 return err;
645
646 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
647 struct rt6_info *rt;
648 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
649
650 if (!skb2)
651 return 0;
652
653 skb_dst_drop(skb2);
654 skb_pull(skb2, offset);
655 skb_reset_network_header(skb2);
656
657 /* Try to guess incoming interface */
658 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
659 NULL, 0, 0);
660
661 if (rt && rt->dst.dev)
662 skb2->dev = rt->dst.dev;
663
664 icmpv6_send(skb2, rel_type, rel_code, rel_info);
665
666 if (rt)
667 dst_release(&rt->dst);
668
669 kfree_skb(skb2);
670 }
671
672 return 0;
673 }
674
675 static void ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
676 const struct ipv6hdr *ipv6h,
677 struct sk_buff *skb)
678 {
679 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
680
681 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
682 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
683
684 if (INET_ECN_is_ce(dsfield))
685 IP_ECN_set_ce(ip_hdr(skb));
686 }
687
688 static void ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
689 const struct ipv6hdr *ipv6h,
690 struct sk_buff *skb)
691 {
692 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
693 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
694
695 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h)))
696 IP6_ECN_set_ce(ipv6_hdr(skb));
697 }
698
699 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
700 const struct in6_addr *laddr,
701 const struct in6_addr *raddr)
702 {
703 struct __ip6_tnl_parm *p = &t->parms;
704 int ltype = ipv6_addr_type(laddr);
705 int rtype = ipv6_addr_type(raddr);
706 __u32 flags = 0;
707
708 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
709 flags = IP6_TNL_F_CAP_PER_PACKET;
710 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
711 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
712 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
713 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
714 if (ltype&IPV6_ADDR_UNICAST)
715 flags |= IP6_TNL_F_CAP_XMIT;
716 if (rtype&IPV6_ADDR_UNICAST)
717 flags |= IP6_TNL_F_CAP_RCV;
718 }
719 return flags;
720 }
721 EXPORT_SYMBOL(ip6_tnl_get_cap);
722
723 /* called with rcu_read_lock() */
724 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
725 const struct in6_addr *laddr,
726 const struct in6_addr *raddr)
727 {
728 struct __ip6_tnl_parm *p = &t->parms;
729 int ret = 0;
730 struct net *net = dev_net(t->dev);
731
732 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
733 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
734 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
735 struct net_device *ldev = NULL;
736
737 if (p->link)
738 ldev = dev_get_by_index_rcu(net, p->link);
739
740 if ((ipv6_addr_is_multicast(laddr) ||
741 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
742 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
743 ret = 1;
744 }
745 return ret;
746 }
747 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
748
749 /**
750 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally
751 * @skb: received socket buffer
752 * @protocol: ethernet protocol ID
753 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN
754 *
755 * Return: 0
756 **/
757
758 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
759 __u8 ipproto,
760 void (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
761 const struct ipv6hdr *ipv6h,
762 struct sk_buff *skb))
763 {
764 struct ip6_tnl *t;
765 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
766
767 rcu_read_lock();
768
769 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
770 &ipv6h->daddr)) != NULL) {
771 struct pcpu_tstats *tstats;
772
773 if (t->parms.proto != ipproto && t->parms.proto != 0) {
774 rcu_read_unlock();
775 goto discard;
776 }
777
778 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
779 rcu_read_unlock();
780 goto discard;
781 }
782
783 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
784 t->dev->stats.rx_dropped++;
785 rcu_read_unlock();
786 goto discard;
787 }
788 secpath_reset(skb);
789 skb->mac_header = skb->network_header;
790 skb_reset_network_header(skb);
791 skb->protocol = htons(protocol);
792 skb->pkt_type = PACKET_HOST;
793 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
794
795 tstats = this_cpu_ptr(t->dev->tstats);
796 tstats->rx_packets++;
797 tstats->rx_bytes += skb->len;
798
799 __skb_tunnel_rx(skb, t->dev);
800
801 dscp_ecn_decapsulate(t, ipv6h, skb);
802
803 netif_rx(skb);
804
805 rcu_read_unlock();
806 return 0;
807 }
808 rcu_read_unlock();
809 return 1;
810
811 discard:
812 kfree_skb(skb);
813 return 0;
814 }
815
816 static int ip4ip6_rcv(struct sk_buff *skb)
817 {
818 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP,
819 ip4ip6_dscp_ecn_decapsulate);
820 }
821
822 static int ip6ip6_rcv(struct sk_buff *skb)
823 {
824 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6,
825 ip6ip6_dscp_ecn_decapsulate);
826 }
827
828 struct ipv6_tel_txoption {
829 struct ipv6_txoptions ops;
830 __u8 dst_opt[8];
831 };
832
833 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
834 {
835 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
836
837 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
838 opt->dst_opt[3] = 1;
839 opt->dst_opt[4] = encap_limit;
840 opt->dst_opt[5] = IPV6_TLV_PADN;
841 opt->dst_opt[6] = 1;
842
843 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
844 opt->ops.opt_nflen = 8;
845 }
846
847 /**
848 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
849 * @t: the outgoing tunnel device
850 * @hdr: IPv6 header from the incoming packet
851 *
852 * Description:
853 * Avoid trivial tunneling loop by checking that tunnel exit-point
854 * doesn't match source of incoming packet.
855 *
856 * Return:
857 * 1 if conflict,
858 * 0 else
859 **/
860
861 static inline bool
862 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
863 {
864 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
865 }
866
867 int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
868 {
869 struct __ip6_tnl_parm *p = &t->parms;
870 int ret = 0;
871 struct net *net = dev_net(t->dev);
872
873 if (p->flags & IP6_TNL_F_CAP_XMIT) {
874 struct net_device *ldev = NULL;
875
876 rcu_read_lock();
877 if (p->link)
878 ldev = dev_get_by_index_rcu(net, p->link);
879
880 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
881 pr_warn("%s xmit: Local address not yet configured!\n",
882 p->name);
883 else if (!ipv6_addr_is_multicast(&p->raddr) &&
884 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0)))
885 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
886 p->name);
887 else
888 ret = 1;
889 rcu_read_unlock();
890 }
891 return ret;
892 }
893 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
894
895 /**
896 * ip6_tnl_xmit2 - encapsulate packet and send
897 * @skb: the outgoing socket buffer
898 * @dev: the outgoing tunnel device
899 * @dsfield: dscp code for outer header
900 * @fl: flow of tunneled packet
901 * @encap_limit: encapsulation limit
902 * @pmtu: Path MTU is stored if packet is too big
903 *
904 * Description:
905 * Build new header and do some sanity checks on the packet before sending
906 * it.
907 *
908 * Return:
909 * 0 on success
910 * -1 fail
911 * %-EMSGSIZE message too big. return mtu in this case.
912 **/
913
914 static int ip6_tnl_xmit2(struct sk_buff *skb,
915 struct net_device *dev,
916 __u8 dsfield,
917 struct flowi6 *fl6,
918 int encap_limit,
919 __u32 *pmtu)
920 {
921 struct net *net = dev_net(dev);
922 struct ip6_tnl *t = netdev_priv(dev);
923 struct net_device_stats *stats = &t->dev->stats;
924 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
925 struct ipv6_tel_txoption opt;
926 struct dst_entry *dst = NULL, *ndst = NULL;
927 struct net_device *tdev;
928 int mtu;
929 unsigned int max_headroom = sizeof(struct ipv6hdr);
930 u8 proto;
931 int err = -1;
932 int pkt_len;
933
934 if (!fl6->flowi6_mark)
935 dst = ip6_tnl_dst_check(t);
936 if (!dst) {
937 ndst = ip6_route_output(net, NULL, fl6);
938
939 if (ndst->error)
940 goto tx_err_link_failure;
941 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
942 if (IS_ERR(ndst)) {
943 err = PTR_ERR(ndst);
944 ndst = NULL;
945 goto tx_err_link_failure;
946 }
947 dst = ndst;
948 }
949
950 tdev = dst->dev;
951
952 if (tdev == dev) {
953 stats->collisions++;
954 net_warn_ratelimited("%s: Local routing loop detected!\n",
955 t->parms.name);
956 goto tx_err_dst_release;
957 }
958 mtu = dst_mtu(dst) - sizeof (*ipv6h);
959 if (encap_limit >= 0) {
960 max_headroom += 8;
961 mtu -= 8;
962 }
963 if (mtu < IPV6_MIN_MTU)
964 mtu = IPV6_MIN_MTU;
965 if (skb_dst(skb))
966 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
967 if (skb->len > mtu) {
968 *pmtu = mtu;
969 err = -EMSGSIZE;
970 goto tx_err_dst_release;
971 }
972
973 /*
974 * Okay, now see if we can stuff it in the buffer as-is.
975 */
976 max_headroom += LL_RESERVED_SPACE(tdev);
977
978 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
979 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
980 struct sk_buff *new_skb;
981
982 if (!(new_skb = skb_realloc_headroom(skb, max_headroom)))
983 goto tx_err_dst_release;
984
985 if (skb->sk)
986 skb_set_owner_w(new_skb, skb->sk);
987 consume_skb(skb);
988 skb = new_skb;
989 }
990 skb_dst_drop(skb);
991 if (fl6->flowi6_mark) {
992 skb_dst_set(skb, dst);
993 ndst = NULL;
994 } else {
995 skb_dst_set_noref(skb, dst);
996 }
997 skb->transport_header = skb->network_header;
998
999 proto = fl6->flowi6_proto;
1000 if (encap_limit >= 0) {
1001 init_tel_txopt(&opt, encap_limit);
1002 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
1003 }
1004 skb_push(skb, sizeof(struct ipv6hdr));
1005 skb_reset_network_header(skb);
1006 ipv6h = ipv6_hdr(skb);
1007 *(__be32*)ipv6h = fl6->flowlabel | htonl(0x60000000);
1008 dsfield = INET_ECN_encapsulate(0, dsfield);
1009 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield);
1010 ipv6h->hop_limit = t->parms.hop_limit;
1011 ipv6h->nexthdr = proto;
1012 ipv6h->saddr = fl6->saddr;
1013 ipv6h->daddr = fl6->daddr;
1014 nf_reset(skb);
1015 pkt_len = skb->len;
1016 err = ip6_local_out(skb);
1017
1018 if (net_xmit_eval(err) == 0) {
1019 struct pcpu_tstats *tstats = this_cpu_ptr(t->dev->tstats);
1020
1021 tstats->tx_bytes += pkt_len;
1022 tstats->tx_packets++;
1023 } else {
1024 stats->tx_errors++;
1025 stats->tx_aborted_errors++;
1026 }
1027 if (ndst)
1028 ip6_tnl_dst_store(t, ndst);
1029 return 0;
1030 tx_err_link_failure:
1031 stats->tx_carrier_errors++;
1032 dst_link_failure(skb);
1033 tx_err_dst_release:
1034 dst_release(ndst);
1035 return err;
1036 }
1037
1038 static inline int
1039 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1040 {
1041 struct ip6_tnl *t = netdev_priv(dev);
1042 const struct iphdr *iph = ip_hdr(skb);
1043 int encap_limit = -1;
1044 struct flowi6 fl6;
1045 __u8 dsfield;
1046 __u32 mtu;
1047 int err;
1048
1049 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) ||
1050 !ip6_tnl_xmit_ctl(t))
1051 return -1;
1052
1053 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1054 encap_limit = t->parms.encap_limit;
1055
1056 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1057 fl6.flowi6_proto = IPPROTO_IPIP;
1058
1059 dsfield = ipv4_get_dsfield(iph);
1060
1061 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1062 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1063 & IPV6_TCLASS_MASK;
1064 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1065 fl6.flowi6_mark = skb->mark;
1066
1067 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1068 if (err != 0) {
1069 /* XXX: send ICMP error even if DF is not set. */
1070 if (err == -EMSGSIZE)
1071 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1072 htonl(mtu));
1073 return -1;
1074 }
1075
1076 return 0;
1077 }
1078
1079 static inline int
1080 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1081 {
1082 struct ip6_tnl *t = netdev_priv(dev);
1083 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1084 int encap_limit = -1;
1085 __u16 offset;
1086 struct flowi6 fl6;
1087 __u8 dsfield;
1088 __u32 mtu;
1089 int err;
1090
1091 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
1092 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h))
1093 return -1;
1094
1095 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1096 if (offset > 0) {
1097 struct ipv6_tlv_tnl_enc_lim *tel;
1098 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
1099 if (tel->encap_limit == 0) {
1100 icmpv6_send(skb, ICMPV6_PARAMPROB,
1101 ICMPV6_HDR_FIELD, offset + 2);
1102 return -1;
1103 }
1104 encap_limit = tel->encap_limit - 1;
1105 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1106 encap_limit = t->parms.encap_limit;
1107
1108 memcpy(&fl6, &t->fl.u.ip6, sizeof (fl6));
1109 fl6.flowi6_proto = IPPROTO_IPV6;
1110
1111 dsfield = ipv6_get_dsfield(ipv6h);
1112 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1113 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
1114 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1115 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
1116 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1117 fl6.flowi6_mark = skb->mark;
1118
1119 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
1120 if (err != 0) {
1121 if (err == -EMSGSIZE)
1122 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1123 return -1;
1124 }
1125
1126 return 0;
1127 }
1128
1129 static netdev_tx_t
1130 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1131 {
1132 struct ip6_tnl *t = netdev_priv(dev);
1133 struct net_device_stats *stats = &t->dev->stats;
1134 int ret;
1135
1136 switch (skb->protocol) {
1137 case htons(ETH_P_IP):
1138 ret = ip4ip6_tnl_xmit(skb, dev);
1139 break;
1140 case htons(ETH_P_IPV6):
1141 ret = ip6ip6_tnl_xmit(skb, dev);
1142 break;
1143 default:
1144 goto tx_err;
1145 }
1146
1147 if (ret < 0)
1148 goto tx_err;
1149
1150 return NETDEV_TX_OK;
1151
1152 tx_err:
1153 stats->tx_errors++;
1154 stats->tx_dropped++;
1155 kfree_skb(skb);
1156 return NETDEV_TX_OK;
1157 }
1158
1159 static void ip6_tnl_link_config(struct ip6_tnl *t)
1160 {
1161 struct net_device *dev = t->dev;
1162 struct __ip6_tnl_parm *p = &t->parms;
1163 struct flowi6 *fl6 = &t->fl.u.ip6;
1164
1165 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1166 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1167
1168 /* Set up flowi template */
1169 fl6->saddr = p->laddr;
1170 fl6->daddr = p->raddr;
1171 fl6->flowi6_oif = p->link;
1172 fl6->flowlabel = 0;
1173
1174 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1175 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1176 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1177 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1178
1179 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1180 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1181
1182 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1183 dev->flags |= IFF_POINTOPOINT;
1184 else
1185 dev->flags &= ~IFF_POINTOPOINT;
1186
1187 dev->iflink = p->link;
1188
1189 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1190 int strict = (ipv6_addr_type(&p->raddr) &
1191 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1192
1193 struct rt6_info *rt = rt6_lookup(dev_net(dev),
1194 &p->raddr, &p->laddr,
1195 p->link, strict);
1196
1197 if (rt == NULL)
1198 return;
1199
1200 if (rt->dst.dev) {
1201 dev->hard_header_len = rt->dst.dev->hard_header_len +
1202 sizeof (struct ipv6hdr);
1203
1204 dev->mtu = rt->dst.dev->mtu - sizeof (struct ipv6hdr);
1205 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1206 dev->mtu-=8;
1207
1208 if (dev->mtu < IPV6_MIN_MTU)
1209 dev->mtu = IPV6_MIN_MTU;
1210 }
1211 dst_release(&rt->dst);
1212 }
1213 }
1214
1215 /**
1216 * ip6_tnl_change - update the tunnel parameters
1217 * @t: tunnel to be changed
1218 * @p: tunnel configuration parameters
1219 *
1220 * Description:
1221 * ip6_tnl_change() updates the tunnel parameters
1222 **/
1223
1224 static int
1225 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1226 {
1227 t->parms.laddr = p->laddr;
1228 t->parms.raddr = p->raddr;
1229 t->parms.flags = p->flags;
1230 t->parms.hop_limit = p->hop_limit;
1231 t->parms.encap_limit = p->encap_limit;
1232 t->parms.flowinfo = p->flowinfo;
1233 t->parms.link = p->link;
1234 t->parms.proto = p->proto;
1235 ip6_tnl_dst_reset(t);
1236 ip6_tnl_link_config(t);
1237 return 0;
1238 }
1239
1240 static void
1241 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1242 {
1243 p->laddr = u->laddr;
1244 p->raddr = u->raddr;
1245 p->flags = u->flags;
1246 p->hop_limit = u->hop_limit;
1247 p->encap_limit = u->encap_limit;
1248 p->flowinfo = u->flowinfo;
1249 p->link = u->link;
1250 p->proto = u->proto;
1251 memcpy(p->name, u->name, sizeof(u->name));
1252 }
1253
1254 static void
1255 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1256 {
1257 u->laddr = p->laddr;
1258 u->raddr = p->raddr;
1259 u->flags = p->flags;
1260 u->hop_limit = p->hop_limit;
1261 u->encap_limit = p->encap_limit;
1262 u->flowinfo = p->flowinfo;
1263 u->link = p->link;
1264 u->proto = p->proto;
1265 memcpy(u->name, p->name, sizeof(u->name));
1266 }
1267
1268 /**
1269 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1270 * @dev: virtual device associated with tunnel
1271 * @ifr: parameters passed from userspace
1272 * @cmd: command to be performed
1273 *
1274 * Description:
1275 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1276 * from userspace.
1277 *
1278 * The possible commands are the following:
1279 * %SIOCGETTUNNEL: get tunnel parameters for device
1280 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1281 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1282 * %SIOCDELTUNNEL: delete tunnel
1283 *
1284 * The fallback device "ip6tnl0", created during module
1285 * initialization, can be used for creating other tunnel devices.
1286 *
1287 * Return:
1288 * 0 on success,
1289 * %-EFAULT if unable to copy data to or from userspace,
1290 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1291 * %-EINVAL if passed tunnel parameters are invalid,
1292 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1293 * %-ENODEV if attempting to change or delete a nonexisting device
1294 **/
1295
1296 static int
1297 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1298 {
1299 int err = 0;
1300 struct ip6_tnl_parm p;
1301 struct __ip6_tnl_parm p1;
1302 struct ip6_tnl *t = NULL;
1303 struct net *net = dev_net(dev);
1304 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1305
1306 switch (cmd) {
1307 case SIOCGETTUNNEL:
1308 if (dev == ip6n->fb_tnl_dev) {
1309 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) {
1310 err = -EFAULT;
1311 break;
1312 }
1313 ip6_tnl_parm_from_user(&p1, &p);
1314 t = ip6_tnl_locate(net, &p1, 0);
1315 } else {
1316 memset(&p, 0, sizeof(p));
1317 }
1318 if (t == NULL)
1319 t = netdev_priv(dev);
1320 ip6_tnl_parm_to_user(&p, &t->parms);
1321 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) {
1322 err = -EFAULT;
1323 }
1324 break;
1325 case SIOCADDTUNNEL:
1326 case SIOCCHGTUNNEL:
1327 err = -EPERM;
1328 if (!capable(CAP_NET_ADMIN))
1329 break;
1330 err = -EFAULT;
1331 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1332 break;
1333 err = -EINVAL;
1334 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1335 p.proto != 0)
1336 break;
1337 ip6_tnl_parm_from_user(&p1, &p);
1338 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1339 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
1340 if (t != NULL) {
1341 if (t->dev != dev) {
1342 err = -EEXIST;
1343 break;
1344 }
1345 } else
1346 t = netdev_priv(dev);
1347
1348 ip6_tnl_unlink(ip6n, t);
1349 synchronize_net();
1350 err = ip6_tnl_change(t, &p1);
1351 ip6_tnl_link(ip6n, t);
1352 netdev_state_change(dev);
1353 }
1354 if (t) {
1355 err = 0;
1356 ip6_tnl_parm_to_user(&p, &t->parms);
1357 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1358 err = -EFAULT;
1359
1360 } else
1361 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1362 break;
1363 case SIOCDELTUNNEL:
1364 err = -EPERM;
1365 if (!capable(CAP_NET_ADMIN))
1366 break;
1367
1368 if (dev == ip6n->fb_tnl_dev) {
1369 err = -EFAULT;
1370 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p)))
1371 break;
1372 err = -ENOENT;
1373 ip6_tnl_parm_from_user(&p1, &p);
1374 t = ip6_tnl_locate(net, &p1, 0);
1375 if (t == NULL)
1376 break;
1377 err = -EPERM;
1378 if (t->dev == ip6n->fb_tnl_dev)
1379 break;
1380 dev = t->dev;
1381 }
1382 err = 0;
1383 unregister_netdevice(dev);
1384 break;
1385 default:
1386 err = -EINVAL;
1387 }
1388 return err;
1389 }
1390
1391 /**
1392 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1393 * @dev: virtual device associated with tunnel
1394 * @new_mtu: the new mtu
1395 *
1396 * Return:
1397 * 0 on success,
1398 * %-EINVAL if mtu too small
1399 **/
1400
1401 static int
1402 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1403 {
1404 if (new_mtu < IPV6_MIN_MTU) {
1405 return -EINVAL;
1406 }
1407 dev->mtu = new_mtu;
1408 return 0;
1409 }
1410
1411
1412 static const struct net_device_ops ip6_tnl_netdev_ops = {
1413 .ndo_uninit = ip6_tnl_dev_uninit,
1414 .ndo_start_xmit = ip6_tnl_xmit,
1415 .ndo_do_ioctl = ip6_tnl_ioctl,
1416 .ndo_change_mtu = ip6_tnl_change_mtu,
1417 .ndo_get_stats = ip6_get_stats,
1418 };
1419
1420
1421 /**
1422 * ip6_tnl_dev_setup - setup virtual tunnel device
1423 * @dev: virtual device associated with tunnel
1424 *
1425 * Description:
1426 * Initialize function pointers and device parameters
1427 **/
1428
1429 static void ip6_tnl_dev_setup(struct net_device *dev)
1430 {
1431 struct ip6_tnl *t;
1432
1433 dev->netdev_ops = &ip6_tnl_netdev_ops;
1434 dev->destructor = ip6_dev_free;
1435
1436 dev->type = ARPHRD_TUNNEL6;
1437 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr);
1438 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr);
1439 t = netdev_priv(dev);
1440 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1441 dev->mtu-=8;
1442 dev->flags |= IFF_NOARP;
1443 dev->addr_len = sizeof(struct in6_addr);
1444 dev->features |= NETIF_F_NETNS_LOCAL;
1445 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1446 }
1447
1448
1449 /**
1450 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1451 * @dev: virtual device associated with tunnel
1452 **/
1453
1454 static inline int
1455 ip6_tnl_dev_init_gen(struct net_device *dev)
1456 {
1457 struct ip6_tnl *t = netdev_priv(dev);
1458
1459 t->dev = dev;
1460 dev->tstats = alloc_percpu(struct pcpu_tstats);
1461 if (!dev->tstats)
1462 return -ENOMEM;
1463 return 0;
1464 }
1465
1466 /**
1467 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1468 * @dev: virtual device associated with tunnel
1469 **/
1470
1471 static int ip6_tnl_dev_init(struct net_device *dev)
1472 {
1473 struct ip6_tnl *t = netdev_priv(dev);
1474 int err = ip6_tnl_dev_init_gen(dev);
1475
1476 if (err)
1477 return err;
1478 ip6_tnl_link_config(t);
1479 return 0;
1480 }
1481
1482 /**
1483 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1484 * @dev: fallback device
1485 *
1486 * Return: 0
1487 **/
1488
1489 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1490 {
1491 struct ip6_tnl *t = netdev_priv(dev);
1492 struct net *net = dev_net(dev);
1493 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1494 int err = ip6_tnl_dev_init_gen(dev);
1495
1496 if (err)
1497 return err;
1498
1499 t->parms.proto = IPPROTO_IPV6;
1500 dev_hold(dev);
1501
1502 ip6_tnl_link_config(t);
1503
1504 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1505 return 0;
1506 }
1507
1508 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1509 .handler = ip4ip6_rcv,
1510 .err_handler = ip4ip6_err,
1511 .priority = 1,
1512 };
1513
1514 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1515 .handler = ip6ip6_rcv,
1516 .err_handler = ip6ip6_err,
1517 .priority = 1,
1518 };
1519
1520 static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n)
1521 {
1522 int h;
1523 struct ip6_tnl *t;
1524 LIST_HEAD(list);
1525
1526 for (h = 0; h < HASH_SIZE; h++) {
1527 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1528 while (t != NULL) {
1529 unregister_netdevice_queue(t->dev, &list);
1530 t = rtnl_dereference(t->next);
1531 }
1532 }
1533
1534 t = rtnl_dereference(ip6n->tnls_wc[0]);
1535 unregister_netdevice_queue(t->dev, &list);
1536 unregister_netdevice_many(&list);
1537 }
1538
1539 static int __net_init ip6_tnl_init_net(struct net *net)
1540 {
1541 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1542 struct ip6_tnl *t = NULL;
1543 int err;
1544
1545 ip6n->tnls[0] = ip6n->tnls_wc;
1546 ip6n->tnls[1] = ip6n->tnls_r_l;
1547
1548 err = -ENOMEM;
1549 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1550 ip6_tnl_dev_setup);
1551
1552 if (!ip6n->fb_tnl_dev)
1553 goto err_alloc_dev;
1554 dev_net_set(ip6n->fb_tnl_dev, net);
1555
1556 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1557 if (err < 0)
1558 goto err_register;
1559
1560 err = register_netdev(ip6n->fb_tnl_dev);
1561 if (err < 0)
1562 goto err_register;
1563
1564 t = netdev_priv(ip6n->fb_tnl_dev);
1565
1566 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1567 return 0;
1568
1569 err_register:
1570 ip6_dev_free(ip6n->fb_tnl_dev);
1571 err_alloc_dev:
1572 return err;
1573 }
1574
1575 static void __net_exit ip6_tnl_exit_net(struct net *net)
1576 {
1577 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1578
1579 rtnl_lock();
1580 ip6_tnl_destroy_tunnels(ip6n);
1581 rtnl_unlock();
1582 }
1583
1584 static struct pernet_operations ip6_tnl_net_ops = {
1585 .init = ip6_tnl_init_net,
1586 .exit = ip6_tnl_exit_net,
1587 .id = &ip6_tnl_net_id,
1588 .size = sizeof(struct ip6_tnl_net),
1589 };
1590
1591 /**
1592 * ip6_tunnel_init - register protocol and reserve needed resources
1593 *
1594 * Return: 0 on success
1595 **/
1596
1597 static int __init ip6_tunnel_init(void)
1598 {
1599 int err;
1600
1601 err = register_pernet_device(&ip6_tnl_net_ops);
1602 if (err < 0)
1603 goto out_pernet;
1604
1605 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1606 if (err < 0) {
1607 pr_err("%s: can't register ip4ip6\n", __func__);
1608 goto out_ip4ip6;
1609 }
1610
1611 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1612 if (err < 0) {
1613 pr_err("%s: can't register ip6ip6\n", __func__);
1614 goto out_ip6ip6;
1615 }
1616
1617 return 0;
1618
1619 out_ip6ip6:
1620 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1621 out_ip4ip6:
1622 unregister_pernet_device(&ip6_tnl_net_ops);
1623 out_pernet:
1624 return err;
1625 }
1626
1627 /**
1628 * ip6_tunnel_cleanup - free resources and unregister protocol
1629 **/
1630
1631 static void __exit ip6_tunnel_cleanup(void)
1632 {
1633 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1634 pr_info("%s: can't deregister ip4ip6\n", __func__);
1635
1636 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1637 pr_info("%s: can't deregister ip6ip6\n", __func__);
1638
1639 unregister_pernet_device(&ip6_tnl_net_ops);
1640 }
1641
1642 module_init(ip6_tunnel_init);
1643 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support