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tracing: Use helper functions in event assignment to shrink macro size
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blob5db8d310f9c07adc656dff9e3e909f611dbc1b1b
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
61 MODULE_AUTHOR("Ville Nuorvala");
62 MODULE_DESCRIPTION("IPv6 tunneling device");
63 MODULE_LICENSE("GPL");
64 MODULE_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
75 static bool log_ecn_error = true;
76 module_param(log_ecn_error, bool, 0644);
77 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
78
79 static 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
86 static int ip6_tnl_dev_init(struct net_device *dev);
87 static void ip6_tnl_dev_setup(struct net_device *dev);
88 static struct rtnl_link_ops ip6_link_ops __read_mostly;
89
90 static int ip6_tnl_net_id __read_mostly;
91 struct 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
100 static 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_bh(&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_bh(&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
134 struct 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 }
147 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check);
148
149 void ip6_tnl_dst_reset(struct ip6_tnl *t)
150 {
151 dst_release(t->dst_cache);
152 t->dst_cache = NULL;
153 }
154 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset);
155
156 void 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 }
163 EXPORT_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
179 static struct ip6_tnl *
180 ip6_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
210 static struct ip6_tnl __rcu **
211 ip6_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
230 static void
231 ip6_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
244 static void
245 ip6_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
260 static void ip6_dev_free(struct net_device *dev)
261 {
262 free_percpu(dev->tstats);
263 free_netdev(dev);
264 }
265
266 static 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
289 out:
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
305 static 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
332 failed_free:
333 ip6_dev_free(dev);
334 failed:
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
352 static 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
381 static void
382 ip6_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 }
455 EXPORT_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
465 static int
466 ip6_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
545 out:
546 rcu_read_unlock();
547 return err;
548 }
549
550 static int
551 ip4ip6_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
651 out:
652 kfree_skb(skb2);
653 return 0;
654 }
655
656 static int
657 ip6ip6_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
699 static 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
711 static 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 }
743 EXPORT_SYMBOL(ip6_tnl_get_cap);
744
745 /* called with rcu_read_lock() */
746 int 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 }
769 EXPORT_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
780 static 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
846 discard:
847 kfree_skb(skb);
848 return 0;
849 }
850
851 static 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
857 static 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
863 struct ipv6_tel_txoption {
864 struct ipv6_txoptions ops;
865 __u8 dst_opt[8];
866 };
867
868 static 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
896 static inline bool
897 ip6_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
902 int 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 }
928 EXPORT_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
949 static 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;
1057 tx_err_link_failure:
1058 stats->tx_carrier_errors++;
1059 dst_link_failure(skb);
1060 tx_err_dst_release:
1061 dst_release(ndst);
1062 return err;
1063 }
1064
1065 static inline int
1066 ip4ip6_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
1106 static inline int
1107 ip6ip6_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
1156 static netdev_tx_t
1157 ip6_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
1179 tx_err:
1180 stats->tx_errors++;
1181 stats->tx_dropped++;
1182 kfree_skb(skb);
1183 return NETDEV_TX_OK;
1184 }
1185
1186 static 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
1251 static int
1252 ip6_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
1267 static 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
1281 static void
1282 ip6_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
1295 static void
1296 ip6_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
1337 static int
1338 ip6_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 = NULL;
1344 struct net *net = dev_net(dev);
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 } else {
1357 memset(&p, 0, sizeof(p));
1358 }
1359 if (t == NULL)
1360 t = netdev_priv(dev);
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
1438 static int
1439 ip6_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
1457 static 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
1474 static 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
1501 static inline int
1502 ip6_tnl_dev_init_gen(struct net_device *dev)
1503 {
1504 struct ip6_tnl *t = netdev_priv(dev);
1505 int i;
1506
1507 t->dev = dev;
1508 t->net = dev_net(dev);
1509 dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
1510 if (!dev->tstats)
1511 return -ENOMEM;
1512
1513 for_each_possible_cpu(i) {
1514 struct pcpu_sw_netstats *ip6_tnl_stats;
1515 ip6_tnl_stats = per_cpu_ptr(dev->tstats, i);
1516 u64_stats_init(&ip6_tnl_stats->syncp);
1517 }
1518 return 0;
1519 }
1520
1521 /**
1522 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1523 * @dev: virtual device associated with tunnel
1524 **/
1525
1526 static int ip6_tnl_dev_init(struct net_device *dev)
1527 {
1528 struct ip6_tnl *t = netdev_priv(dev);
1529 int err = ip6_tnl_dev_init_gen(dev);
1530
1531 if (err)
1532 return err;
1533 ip6_tnl_link_config(t);
1534 return 0;
1535 }
1536
1537 /**
1538 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1539 * @dev: fallback device
1540 *
1541 * Return: 0
1542 **/
1543
1544 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1545 {
1546 struct ip6_tnl *t = netdev_priv(dev);
1547 struct net *net = dev_net(dev);
1548 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1549 int err = ip6_tnl_dev_init_gen(dev);
1550
1551 if (err)
1552 return err;
1553
1554 t->parms.proto = IPPROTO_IPV6;
1555 dev_hold(dev);
1556
1557 ip6_tnl_link_config(t);
1558
1559 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1560 return 0;
1561 }
1562
1563 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1564 {
1565 u8 proto;
1566
1567 if (!data)
1568 return 0;
1569
1570 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1571 if (proto != IPPROTO_IPV6 &&
1572 proto != IPPROTO_IPIP &&
1573 proto != 0)
1574 return -EINVAL;
1575
1576 return 0;
1577 }
1578
1579 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1580 struct __ip6_tnl_parm *parms)
1581 {
1582 memset(parms, 0, sizeof(*parms));
1583
1584 if (!data)
1585 return;
1586
1587 if (data[IFLA_IPTUN_LINK])
1588 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1589
1590 if (data[IFLA_IPTUN_LOCAL])
1591 nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],
1592 sizeof(struct in6_addr));
1593
1594 if (data[IFLA_IPTUN_REMOTE])
1595 nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],
1596 sizeof(struct in6_addr));
1597
1598 if (data[IFLA_IPTUN_TTL])
1599 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1600
1601 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1602 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1603
1604 if (data[IFLA_IPTUN_FLOWINFO])
1605 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1606
1607 if (data[IFLA_IPTUN_FLAGS])
1608 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1609
1610 if (data[IFLA_IPTUN_PROTO])
1611 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1612 }
1613
1614 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1615 struct nlattr *tb[], struct nlattr *data[])
1616 {
1617 struct net *net = dev_net(dev);
1618 struct ip6_tnl *nt;
1619
1620 nt = netdev_priv(dev);
1621 ip6_tnl_netlink_parms(data, &nt->parms);
1622
1623 if (ip6_tnl_locate(net, &nt->parms, 0))
1624 return -EEXIST;
1625
1626 return ip6_tnl_create2(dev);
1627 }
1628
1629 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1630 struct nlattr *data[])
1631 {
1632 struct ip6_tnl *t = netdev_priv(dev);
1633 struct __ip6_tnl_parm p;
1634 struct net *net = t->net;
1635 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1636
1637 if (dev == ip6n->fb_tnl_dev)
1638 return -EINVAL;
1639
1640 ip6_tnl_netlink_parms(data, &p);
1641
1642 t = ip6_tnl_locate(net, &p, 0);
1643
1644 if (t) {
1645 if (t->dev != dev)
1646 return -EEXIST;
1647 } else
1648 t = netdev_priv(dev);
1649
1650 return ip6_tnl_update(t, &p);
1651 }
1652
1653 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
1654 {
1655 struct net *net = dev_net(dev);
1656 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1657
1658 if (dev != ip6n->fb_tnl_dev)
1659 unregister_netdevice_queue(dev, head);
1660 }
1661
1662 static size_t ip6_tnl_get_size(const struct net_device *dev)
1663 {
1664 return
1665 /* IFLA_IPTUN_LINK */
1666 nla_total_size(4) +
1667 /* IFLA_IPTUN_LOCAL */
1668 nla_total_size(sizeof(struct in6_addr)) +
1669 /* IFLA_IPTUN_REMOTE */
1670 nla_total_size(sizeof(struct in6_addr)) +
1671 /* IFLA_IPTUN_TTL */
1672 nla_total_size(1) +
1673 /* IFLA_IPTUN_ENCAP_LIMIT */
1674 nla_total_size(1) +
1675 /* IFLA_IPTUN_FLOWINFO */
1676 nla_total_size(4) +
1677 /* IFLA_IPTUN_FLAGS */
1678 nla_total_size(4) +
1679 /* IFLA_IPTUN_PROTO */
1680 nla_total_size(1) +
1681 0;
1682 }
1683
1684 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
1685 {
1686 struct ip6_tnl *tunnel = netdev_priv(dev);
1687 struct __ip6_tnl_parm *parm = &tunnel->parms;
1688
1689 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
1690 nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
1691 &parm->laddr) ||
1692 nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
1693 &parm->raddr) ||
1694 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
1695 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
1696 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
1697 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
1698 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
1699 goto nla_put_failure;
1700 return 0;
1701
1702 nla_put_failure:
1703 return -EMSGSIZE;
1704 }
1705
1706 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
1707 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
1708 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
1709 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
1710 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
1711 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
1712 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
1713 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
1714 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
1715 };
1716
1717 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
1718 .kind = "ip6tnl",
1719 .maxtype = IFLA_IPTUN_MAX,
1720 .policy = ip6_tnl_policy,
1721 .priv_size = sizeof(struct ip6_tnl),
1722 .setup = ip6_tnl_dev_setup,
1723 .validate = ip6_tnl_validate,
1724 .newlink = ip6_tnl_newlink,
1725 .changelink = ip6_tnl_changelink,
1726 .dellink = ip6_tnl_dellink,
1727 .get_size = ip6_tnl_get_size,
1728 .fill_info = ip6_tnl_fill_info,
1729 };
1730
1731 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
1732 .handler = ip4ip6_rcv,
1733 .err_handler = ip4ip6_err,
1734 .priority = 1,
1735 };
1736
1737 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
1738 .handler = ip6ip6_rcv,
1739 .err_handler = ip6ip6_err,
1740 .priority = 1,
1741 };
1742
1743 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
1744 {
1745 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1746 struct net_device *dev, *aux;
1747 int h;
1748 struct ip6_tnl *t;
1749 LIST_HEAD(list);
1750
1751 for_each_netdev_safe(net, dev, aux)
1752 if (dev->rtnl_link_ops == &ip6_link_ops)
1753 unregister_netdevice_queue(dev, &list);
1754
1755 for (h = 0; h < HASH_SIZE; h++) {
1756 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1757 while (t != NULL) {
1758 /* If dev is in the same netns, it has already
1759 * been added to the list by the previous loop.
1760 */
1761 if (!net_eq(dev_net(t->dev), net))
1762 unregister_netdevice_queue(t->dev, &list);
1763 t = rtnl_dereference(t->next);
1764 }
1765 }
1766
1767 unregister_netdevice_many(&list);
1768 }
1769
1770 static int __net_init ip6_tnl_init_net(struct net *net)
1771 {
1772 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1773 struct ip6_tnl *t = NULL;
1774 int err;
1775
1776 ip6n->tnls[0] = ip6n->tnls_wc;
1777 ip6n->tnls[1] = ip6n->tnls_r_l;
1778
1779 err = -ENOMEM;
1780 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
1781 ip6_tnl_dev_setup);
1782
1783 if (!ip6n->fb_tnl_dev)
1784 goto err_alloc_dev;
1785 dev_net_set(ip6n->fb_tnl_dev, net);
1786 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
1787 /* FB netdevice is special: we have one, and only one per netns.
1788 * Allowing to move it to another netns is clearly unsafe.
1789 */
1790 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
1791
1792 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1793 if (err < 0)
1794 goto err_register;
1795
1796 err = register_netdev(ip6n->fb_tnl_dev);
1797 if (err < 0)
1798 goto err_register;
1799
1800 t = netdev_priv(ip6n->fb_tnl_dev);
1801
1802 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1803 return 0;
1804
1805 err_register:
1806 ip6_dev_free(ip6n->fb_tnl_dev);
1807 err_alloc_dev:
1808 return err;
1809 }
1810
1811 static void __net_exit ip6_tnl_exit_net(struct net *net)
1812 {
1813 rtnl_lock();
1814 ip6_tnl_destroy_tunnels(net);
1815 rtnl_unlock();
1816 }
1817
1818 static struct pernet_operations ip6_tnl_net_ops = {
1819 .init = ip6_tnl_init_net,
1820 .exit = ip6_tnl_exit_net,
1821 .id = &ip6_tnl_net_id,
1822 .size = sizeof(struct ip6_tnl_net),
1823 };
1824
1825 /**
1826 * ip6_tunnel_init - register protocol and reserve needed resources
1827 *
1828 * Return: 0 on success
1829 **/
1830
1831 static int __init ip6_tunnel_init(void)
1832 {
1833 int err;
1834
1835 err = register_pernet_device(&ip6_tnl_net_ops);
1836 if (err < 0)
1837 goto out_pernet;
1838
1839 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
1840 if (err < 0) {
1841 pr_err("%s: can't register ip4ip6\n", __func__);
1842 goto out_ip4ip6;
1843 }
1844
1845 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
1846 if (err < 0) {
1847 pr_err("%s: can't register ip6ip6\n", __func__);
1848 goto out_ip6ip6;
1849 }
1850 err = rtnl_link_register(&ip6_link_ops);
1851 if (err < 0)
1852 goto rtnl_link_failed;
1853
1854 return 0;
1855
1856 rtnl_link_failed:
1857 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
1858 out_ip6ip6:
1859 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
1860 out_ip4ip6:
1861 unregister_pernet_device(&ip6_tnl_net_ops);
1862 out_pernet:
1863 return err;
1864 }
1865
1866 /**
1867 * ip6_tunnel_cleanup - free resources and unregister protocol
1868 **/
1869
1870 static void __exit ip6_tunnel_cleanup(void)
1871 {
1872 rtnl_link_unregister(&ip6_link_ops);
1873 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
1874 pr_info("%s: can't deregister ip4ip6\n", __func__);
1875
1876 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
1877 pr_info("%s: can't deregister ip6ip6\n", __func__);
1878
1879 unregister_pernet_device(&ip6_tnl_net_ops);
1880 }
1881
1882 module_init(ip6_tunnel_init);
1883 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support