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[mirror_ubuntu-artful-kernel.git] / net / ipv6 / ip6_tunnel.c
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 #include <net/dst_metadata.h>
61
62 MODULE_AUTHOR("Ville Nuorvala");
63 MODULE_DESCRIPTION("IPv6 tunneling device");
64 MODULE_LICENSE("GPL");
65 MODULE_ALIAS_RTNL_LINK("ip6tnl");
66 MODULE_ALIAS_NETDEV("ip6tnl0");
67
68 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
69 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
70
71 static bool log_ecn_error = true;
72 module_param(log_ecn_error, bool, 0644);
73 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
74
75 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
76 {
77 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
78
79 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
80 }
81
82 static int ip6_tnl_dev_init(struct net_device *dev);
83 static void ip6_tnl_dev_setup(struct net_device *dev);
84 static struct rtnl_link_ops ip6_link_ops __read_mostly;
85
86 static unsigned int ip6_tnl_net_id __read_mostly;
87 struct ip6_tnl_net {
88 /* the IPv6 tunnel fallback device */
89 struct net_device *fb_tnl_dev;
90 /* lists for storing tunnels in use */
91 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
92 struct ip6_tnl __rcu *tnls_wc[1];
93 struct ip6_tnl __rcu **tnls[2];
94 struct ip6_tnl __rcu *collect_md_tun;
95 };
96
97 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
98 {
99 struct pcpu_sw_netstats tmp, sum = { 0 };
100 int i;
101
102 for_each_possible_cpu(i) {
103 unsigned int start;
104 const struct pcpu_sw_netstats *tstats =
105 per_cpu_ptr(dev->tstats, i);
106
107 do {
108 start = u64_stats_fetch_begin_irq(&tstats->syncp);
109 tmp.rx_packets = tstats->rx_packets;
110 tmp.rx_bytes = tstats->rx_bytes;
111 tmp.tx_packets = tstats->tx_packets;
112 tmp.tx_bytes = tstats->tx_bytes;
113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
114
115 sum.rx_packets += tmp.rx_packets;
116 sum.rx_bytes += tmp.rx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.tx_bytes += tmp.tx_bytes;
119 }
120 dev->stats.rx_packets = sum.rx_packets;
121 dev->stats.rx_bytes = sum.rx_bytes;
122 dev->stats.tx_packets = sum.tx_packets;
123 dev->stats.tx_bytes = sum.tx_bytes;
124 return &dev->stats;
125 }
126
127 /**
128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
129 * @remote: the address of the tunnel exit-point
130 * @local: the address of the tunnel entry-point
131 *
132 * Return:
133 * tunnel matching given end-points if found,
134 * else fallback tunnel if its device is up,
135 * else %NULL
136 **/
137
138 #define for_each_ip6_tunnel_rcu(start) \
139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
140
141 static struct ip6_tnl *
142 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
143 {
144 unsigned int hash = HASH(remote, local);
145 struct ip6_tnl *t;
146 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
147 struct in6_addr any;
148
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (ipv6_addr_equal(local, &t->parms.laddr) &&
151 ipv6_addr_equal(remote, &t->parms.raddr) &&
152 (t->dev->flags & IFF_UP))
153 return t;
154 }
155
156 memset(&any, 0, sizeof(any));
157 hash = HASH(&any, local);
158 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
159 if (ipv6_addr_equal(local, &t->parms.laddr) &&
160 ipv6_addr_any(&t->parms.raddr) &&
161 (t->dev->flags & IFF_UP))
162 return t;
163 }
164
165 hash = HASH(remote, &any);
166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
168 ipv6_addr_any(&t->parms.laddr) &&
169 (t->dev->flags & IFF_UP))
170 return t;
171 }
172
173 t = rcu_dereference(ip6n->collect_md_tun);
174 if (t)
175 return t;
176
177 t = rcu_dereference(ip6n->tnls_wc[0]);
178 if (t && (t->dev->flags & IFF_UP))
179 return t;
180
181 return NULL;
182 }
183
184 /**
185 * ip6_tnl_bucket - get head of list matching given tunnel parameters
186 * @p: parameters containing tunnel end-points
187 *
188 * Description:
189 * ip6_tnl_bucket() returns the head of the list matching the
190 * &struct in6_addr entries laddr and raddr in @p.
191 *
192 * Return: head of IPv6 tunnel list
193 **/
194
195 static struct ip6_tnl __rcu **
196 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
197 {
198 const struct in6_addr *remote = &p->raddr;
199 const struct in6_addr *local = &p->laddr;
200 unsigned int h = 0;
201 int prio = 0;
202
203 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
204 prio = 1;
205 h = HASH(remote, local);
206 }
207 return &ip6n->tnls[prio][h];
208 }
209
210 /**
211 * ip6_tnl_link - add tunnel to hash table
212 * @t: tunnel to be added
213 **/
214
215 static void
216 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
217 {
218 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
219
220 if (t->parms.collect_md)
221 rcu_assign_pointer(ip6n->collect_md_tun, t);
222 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
223 rcu_assign_pointer(*tp, t);
224 }
225
226 /**
227 * ip6_tnl_unlink - remove tunnel from hash table
228 * @t: tunnel to be removed
229 **/
230
231 static void
232 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
233 {
234 struct ip6_tnl __rcu **tp;
235 struct ip6_tnl *iter;
236
237 if (t->parms.collect_md)
238 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
239
240 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
241 (iter = rtnl_dereference(*tp)) != NULL;
242 tp = &iter->next) {
243 if (t == iter) {
244 rcu_assign_pointer(*tp, t->next);
245 break;
246 }
247 }
248 }
249
250 static void ip6_dev_free(struct net_device *dev)
251 {
252 struct ip6_tnl *t = netdev_priv(dev);
253
254 gro_cells_destroy(&t->gro_cells);
255 dst_cache_destroy(&t->dst_cache);
256 free_percpu(dev->tstats);
257 free_netdev(dev);
258 }
259
260 static int ip6_tnl_create2(struct net_device *dev)
261 {
262 struct ip6_tnl *t = netdev_priv(dev);
263 struct net *net = dev_net(dev);
264 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
265 int err;
266
267 t = netdev_priv(dev);
268
269 dev->rtnl_link_ops = &ip6_link_ops;
270 err = register_netdevice(dev);
271 if (err < 0)
272 goto out;
273
274 strcpy(t->parms.name, dev->name);
275
276 dev_hold(dev);
277 ip6_tnl_link(ip6n, t);
278 return 0;
279
280 out:
281 return err;
282 }
283
284 /**
285 * ip6_tnl_create - create a new tunnel
286 * @p: tunnel parameters
287 * @pt: pointer to new tunnel
288 *
289 * Description:
290 * Create tunnel matching given parameters.
291 *
292 * Return:
293 * created tunnel or error pointer
294 **/
295
296 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
297 {
298 struct net_device *dev;
299 struct ip6_tnl *t;
300 char name[IFNAMSIZ];
301 int err = -ENOMEM;
302
303 if (p->name[0])
304 strlcpy(name, p->name, IFNAMSIZ);
305 else
306 sprintf(name, "ip6tnl%%d");
307
308 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
309 ip6_tnl_dev_setup);
310 if (!dev)
311 goto failed;
312
313 dev_net_set(dev, net);
314
315 t = netdev_priv(dev);
316 t->parms = *p;
317 t->net = dev_net(dev);
318 err = ip6_tnl_create2(dev);
319 if (err < 0)
320 goto failed_free;
321
322 return t;
323
324 failed_free:
325 ip6_dev_free(dev);
326 failed:
327 return ERR_PTR(err);
328 }
329
330 /**
331 * ip6_tnl_locate - find or create tunnel matching given parameters
332 * @p: tunnel parameters
333 * @create: != 0 if allowed to create new tunnel if no match found
334 *
335 * Description:
336 * ip6_tnl_locate() first tries to locate an existing tunnel
337 * based on @parms. If this is unsuccessful, but @create is set a new
338 * tunnel device is created and registered for use.
339 *
340 * Return:
341 * matching tunnel or error pointer
342 **/
343
344 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
345 struct __ip6_tnl_parm *p, int create)
346 {
347 const struct in6_addr *remote = &p->raddr;
348 const struct in6_addr *local = &p->laddr;
349 struct ip6_tnl __rcu **tp;
350 struct ip6_tnl *t;
351 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
352
353 for (tp = ip6_tnl_bucket(ip6n, p);
354 (t = rtnl_dereference(*tp)) != NULL;
355 tp = &t->next) {
356 if (ipv6_addr_equal(local, &t->parms.laddr) &&
357 ipv6_addr_equal(remote, &t->parms.raddr)) {
358 if (create)
359 return ERR_PTR(-EEXIST);
360
361 return t;
362 }
363 }
364 if (!create)
365 return ERR_PTR(-ENODEV);
366 return ip6_tnl_create(net, p);
367 }
368
369 /**
370 * ip6_tnl_dev_uninit - tunnel device uninitializer
371 * @dev: the device to be destroyed
372 *
373 * Description:
374 * ip6_tnl_dev_uninit() removes tunnel from its list
375 **/
376
377 static void
378 ip6_tnl_dev_uninit(struct net_device *dev)
379 {
380 struct ip6_tnl *t = netdev_priv(dev);
381 struct net *net = t->net;
382 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
383
384 if (dev == ip6n->fb_tnl_dev)
385 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
386 else
387 ip6_tnl_unlink(ip6n, t);
388 dst_cache_reset(&t->dst_cache);
389 dev_put(dev);
390 }
391
392 /**
393 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
394 * @skb: received socket buffer
395 *
396 * Return:
397 * 0 if none was found,
398 * else index to encapsulation limit
399 **/
400
401 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
402 {
403 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw;
404 __u8 nexthdr = ipv6h->nexthdr;
405 __u16 off = sizeof(*ipv6h);
406
407 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
408 __u16 optlen = 0;
409 struct ipv6_opt_hdr *hdr;
410 if (raw + off + sizeof(*hdr) > skb->data &&
411 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr)))
412 break;
413
414 hdr = (struct ipv6_opt_hdr *) (raw + off);
415 if (nexthdr == NEXTHDR_FRAGMENT) {
416 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
417 if (frag_hdr->frag_off)
418 break;
419 optlen = 8;
420 } else if (nexthdr == NEXTHDR_AUTH) {
421 optlen = (hdr->hdrlen + 2) << 2;
422 } else {
423 optlen = ipv6_optlen(hdr);
424 }
425 if (nexthdr == NEXTHDR_DEST) {
426 __u16 i = off + 2;
427 while (1) {
428 struct ipv6_tlv_tnl_enc_lim *tel;
429
430 /* No more room for encapsulation limit */
431 if (i + sizeof (*tel) > off + optlen)
432 break;
433
434 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i];
435 /* return index of option if found and valid */
436 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
437 tel->length == 1)
438 return i;
439 /* else jump to next option */
440 if (tel->type)
441 i += tel->length + 2;
442 else
443 i++;
444 }
445 }
446 nexthdr = hdr->nexthdr;
447 off += optlen;
448 }
449 return 0;
450 }
451 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
452
453 /**
454 * ip6_tnl_err - tunnel error handler
455 *
456 * Description:
457 * ip6_tnl_err() should handle errors in the tunnel according
458 * to the specifications in RFC 2473.
459 **/
460
461 static int
462 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
463 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
464 {
465 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
466 struct ip6_tnl *t;
467 int rel_msg = 0;
468 u8 rel_type = ICMPV6_DEST_UNREACH;
469 u8 rel_code = ICMPV6_ADDR_UNREACH;
470 u8 tproto;
471 __u32 rel_info = 0;
472 __u16 len;
473 int err = -ENOENT;
474
475 /* If the packet doesn't contain the original IPv6 header we are
476 in trouble since we might need the source address for further
477 processing of the error. */
478
479 rcu_read_lock();
480 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
481 if (!t)
482 goto out;
483
484 tproto = ACCESS_ONCE(t->parms.proto);
485 if (tproto != ipproto && tproto != 0)
486 goto out;
487
488 err = 0;
489
490 switch (*type) {
491 __u32 teli;
492 struct ipv6_tlv_tnl_enc_lim *tel;
493 __u32 mtu;
494 case ICMPV6_DEST_UNREACH:
495 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
496 t->parms.name);
497 rel_msg = 1;
498 break;
499 case ICMPV6_TIME_EXCEED:
500 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
501 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
502 t->parms.name);
503 rel_msg = 1;
504 }
505 break;
506 case ICMPV6_PARAMPROB:
507 teli = 0;
508 if ((*code) == ICMPV6_HDR_FIELD)
509 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
510
511 if (teli && teli == *info - 2) {
512 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
513 if (tel->encap_limit == 0) {
514 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
515 t->parms.name);
516 rel_msg = 1;
517 }
518 } else {
519 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
520 t->parms.name);
521 }
522 break;
523 case ICMPV6_PKT_TOOBIG:
524 mtu = *info - offset;
525 if (mtu < IPV6_MIN_MTU)
526 mtu = IPV6_MIN_MTU;
527 t->dev->mtu = mtu;
528
529 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
530 if (len > mtu) {
531 rel_type = ICMPV6_PKT_TOOBIG;
532 rel_code = 0;
533 rel_info = mtu;
534 rel_msg = 1;
535 }
536 break;
537 }
538
539 *type = rel_type;
540 *code = rel_code;
541 *info = rel_info;
542 *msg = rel_msg;
543
544 out:
545 rcu_read_unlock();
546 return err;
547 }
548
549 static int
550 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
551 u8 type, u8 code, int offset, __be32 info)
552 {
553 int rel_msg = 0;
554 u8 rel_type = type;
555 u8 rel_code = code;
556 __u32 rel_info = ntohl(info);
557 int err;
558 struct sk_buff *skb2;
559 const struct iphdr *eiph;
560 struct rtable *rt;
561 struct flowi4 fl4;
562
563 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
564 &rel_msg, &rel_info, offset);
565 if (err < 0)
566 return err;
567
568 if (rel_msg == 0)
569 return 0;
570
571 switch (rel_type) {
572 case ICMPV6_DEST_UNREACH:
573 if (rel_code != ICMPV6_ADDR_UNREACH)
574 return 0;
575 rel_type = ICMP_DEST_UNREACH;
576 rel_code = ICMP_HOST_UNREACH;
577 break;
578 case ICMPV6_PKT_TOOBIG:
579 if (rel_code != 0)
580 return 0;
581 rel_type = ICMP_DEST_UNREACH;
582 rel_code = ICMP_FRAG_NEEDED;
583 break;
584 case NDISC_REDIRECT:
585 rel_type = ICMP_REDIRECT;
586 rel_code = ICMP_REDIR_HOST;
587 default:
588 return 0;
589 }
590
591 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
592 return 0;
593
594 skb2 = skb_clone(skb, GFP_ATOMIC);
595 if (!skb2)
596 return 0;
597
598 skb_dst_drop(skb2);
599
600 skb_pull(skb2, offset);
601 skb_reset_network_header(skb2);
602 eiph = ip_hdr(skb2);
603
604 /* Try to guess incoming interface */
605 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
606 eiph->saddr, 0,
607 0, 0,
608 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
609 if (IS_ERR(rt))
610 goto out;
611
612 skb2->dev = rt->dst.dev;
613
614 /* route "incoming" packet */
615 if (rt->rt_flags & RTCF_LOCAL) {
616 ip_rt_put(rt);
617 rt = NULL;
618 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
619 eiph->daddr, eiph->saddr,
620 0, 0,
621 IPPROTO_IPIP,
622 RT_TOS(eiph->tos), 0);
623 if (IS_ERR(rt) ||
624 rt->dst.dev->type != ARPHRD_TUNNEL) {
625 if (!IS_ERR(rt))
626 ip_rt_put(rt);
627 goto out;
628 }
629 skb_dst_set(skb2, &rt->dst);
630 } else {
631 ip_rt_put(rt);
632 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
633 skb2->dev) ||
634 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
635 goto out;
636 }
637
638 /* change mtu on this route */
639 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
640 if (rel_info > dst_mtu(skb_dst(skb2)))
641 goto out;
642
643 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
644 }
645 if (rel_type == ICMP_REDIRECT)
646 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
647
648 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
649
650 out:
651 kfree_skb(skb2);
652 return 0;
653 }
654
655 static int
656 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
657 u8 type, u8 code, int offset, __be32 info)
658 {
659 int rel_msg = 0;
660 u8 rel_type = type;
661 u8 rel_code = code;
662 __u32 rel_info = ntohl(info);
663 int err;
664
665 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
666 &rel_msg, &rel_info, offset);
667 if (err < 0)
668 return err;
669
670 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
671 struct rt6_info *rt;
672 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
673
674 if (!skb2)
675 return 0;
676
677 skb_dst_drop(skb2);
678 skb_pull(skb2, offset);
679 skb_reset_network_header(skb2);
680
681 /* Try to guess incoming interface */
682 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
683 NULL, 0, 0);
684
685 if (rt && rt->dst.dev)
686 skb2->dev = rt->dst.dev;
687
688 icmpv6_send(skb2, rel_type, rel_code, rel_info);
689
690 ip6_rt_put(rt);
691
692 kfree_skb(skb2);
693 }
694
695 return 0;
696 }
697
698 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
699 const struct ipv6hdr *ipv6h,
700 struct sk_buff *skb)
701 {
702 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
703
704 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
705 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
706
707 return IP6_ECN_decapsulate(ipv6h, skb);
708 }
709
710 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
711 const struct ipv6hdr *ipv6h,
712 struct sk_buff *skb)
713 {
714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
715 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
716
717 return IP6_ECN_decapsulate(ipv6h, skb);
718 }
719
720 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
721 const struct in6_addr *laddr,
722 const struct in6_addr *raddr)
723 {
724 struct __ip6_tnl_parm *p = &t->parms;
725 int ltype = ipv6_addr_type(laddr);
726 int rtype = ipv6_addr_type(raddr);
727 __u32 flags = 0;
728
729 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
730 flags = IP6_TNL_F_CAP_PER_PACKET;
731 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
732 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
733 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
734 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
735 if (ltype&IPV6_ADDR_UNICAST)
736 flags |= IP6_TNL_F_CAP_XMIT;
737 if (rtype&IPV6_ADDR_UNICAST)
738 flags |= IP6_TNL_F_CAP_RCV;
739 }
740 return flags;
741 }
742 EXPORT_SYMBOL(ip6_tnl_get_cap);
743
744 /* called with rcu_read_lock() */
745 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
746 const struct in6_addr *laddr,
747 const struct in6_addr *raddr)
748 {
749 struct __ip6_tnl_parm *p = &t->parms;
750 int ret = 0;
751 struct net *net = t->net;
752
753 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
754 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
755 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
756 struct net_device *ldev = NULL;
757
758 if (p->link)
759 ldev = dev_get_by_index_rcu(net, p->link);
760
761 if ((ipv6_addr_is_multicast(laddr) ||
762 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
763 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
764 ret = 1;
765 }
766 return ret;
767 }
768 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
769
770 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
771 const struct tnl_ptk_info *tpi,
772 struct metadata_dst *tun_dst,
773 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
774 const struct ipv6hdr *ipv6h,
775 struct sk_buff *skb),
776 bool log_ecn_err)
777 {
778 struct pcpu_sw_netstats *tstats;
779 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
780 int err;
781
782 if ((!(tpi->flags & TUNNEL_CSUM) &&
783 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
784 ((tpi->flags & TUNNEL_CSUM) &&
785 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
786 tunnel->dev->stats.rx_crc_errors++;
787 tunnel->dev->stats.rx_errors++;
788 goto drop;
789 }
790
791 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
792 if (!(tpi->flags & TUNNEL_SEQ) ||
793 (tunnel->i_seqno &&
794 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
795 tunnel->dev->stats.rx_fifo_errors++;
796 tunnel->dev->stats.rx_errors++;
797 goto drop;
798 }
799 tunnel->i_seqno = ntohl(tpi->seq) + 1;
800 }
801
802 skb->protocol = tpi->proto;
803
804 /* Warning: All skb pointers will be invalidated! */
805 if (tunnel->dev->type == ARPHRD_ETHER) {
806 if (!pskb_may_pull(skb, ETH_HLEN)) {
807 tunnel->dev->stats.rx_length_errors++;
808 tunnel->dev->stats.rx_errors++;
809 goto drop;
810 }
811
812 ipv6h = ipv6_hdr(skb);
813 skb->protocol = eth_type_trans(skb, tunnel->dev);
814 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
815 } else {
816 skb->dev = tunnel->dev;
817 }
818
819 skb_reset_network_header(skb);
820 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
821
822 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
823
824 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
825 if (unlikely(err)) {
826 if (log_ecn_err)
827 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
828 &ipv6h->saddr,
829 ipv6_get_dsfield(ipv6h));
830 if (err > 1) {
831 ++tunnel->dev->stats.rx_frame_errors;
832 ++tunnel->dev->stats.rx_errors;
833 goto drop;
834 }
835 }
836
837 tstats = this_cpu_ptr(tunnel->dev->tstats);
838 u64_stats_update_begin(&tstats->syncp);
839 tstats->rx_packets++;
840 tstats->rx_bytes += skb->len;
841 u64_stats_update_end(&tstats->syncp);
842
843 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
844
845 if (tun_dst)
846 skb_dst_set(skb, (struct dst_entry *)tun_dst);
847
848 gro_cells_receive(&tunnel->gro_cells, skb);
849 return 0;
850
851 drop:
852 kfree_skb(skb);
853 return 0;
854 }
855
856 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
857 const struct tnl_ptk_info *tpi,
858 struct metadata_dst *tun_dst,
859 bool log_ecn_err)
860 {
861 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
862 log_ecn_err);
863 }
864 EXPORT_SYMBOL(ip6_tnl_rcv);
865
866 static const struct tnl_ptk_info tpi_v6 = {
867 /* no tunnel info required for ipxip6. */
868 .proto = htons(ETH_P_IPV6),
869 };
870
871 static const struct tnl_ptk_info tpi_v4 = {
872 /* no tunnel info required for ipxip6. */
873 .proto = htons(ETH_P_IP),
874 };
875
876 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
877 const struct tnl_ptk_info *tpi,
878 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
879 const struct ipv6hdr *ipv6h,
880 struct sk_buff *skb))
881 {
882 struct ip6_tnl *t;
883 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
884 struct metadata_dst *tun_dst = NULL;
885 int ret = -1;
886
887 rcu_read_lock();
888 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
889
890 if (t) {
891 u8 tproto = ACCESS_ONCE(t->parms.proto);
892
893 if (tproto != ipproto && tproto != 0)
894 goto drop;
895 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
896 goto drop;
897 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
898 goto drop;
899 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
900 goto drop;
901 if (t->parms.collect_md) {
902 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
903 if (!tun_dst)
904 return 0;
905 }
906 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
907 log_ecn_error);
908 }
909
910 rcu_read_unlock();
911
912 return ret;
913
914 drop:
915 rcu_read_unlock();
916 kfree_skb(skb);
917 return 0;
918 }
919
920 static int ip4ip6_rcv(struct sk_buff *skb)
921 {
922 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
923 ip4ip6_dscp_ecn_decapsulate);
924 }
925
926 static int ip6ip6_rcv(struct sk_buff *skb)
927 {
928 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
929 ip6ip6_dscp_ecn_decapsulate);
930 }
931
932 struct ipv6_tel_txoption {
933 struct ipv6_txoptions ops;
934 __u8 dst_opt[8];
935 };
936
937 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
938 {
939 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
940
941 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
942 opt->dst_opt[3] = 1;
943 opt->dst_opt[4] = encap_limit;
944 opt->dst_opt[5] = IPV6_TLV_PADN;
945 opt->dst_opt[6] = 1;
946
947 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
948 opt->ops.opt_nflen = 8;
949 }
950
951 /**
952 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
953 * @t: the outgoing tunnel device
954 * @hdr: IPv6 header from the incoming packet
955 *
956 * Description:
957 * Avoid trivial tunneling loop by checking that tunnel exit-point
958 * doesn't match source of incoming packet.
959 *
960 * Return:
961 * 1 if conflict,
962 * 0 else
963 **/
964
965 static inline bool
966 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
967 {
968 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
969 }
970
971 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
972 const struct in6_addr *laddr,
973 const struct in6_addr *raddr)
974 {
975 struct __ip6_tnl_parm *p = &t->parms;
976 int ret = 0;
977 struct net *net = t->net;
978
979 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
980 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
981 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
982 struct net_device *ldev = NULL;
983
984 rcu_read_lock();
985 if (p->link)
986 ldev = dev_get_by_index_rcu(net, p->link);
987
988 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
989 pr_warn("%s xmit: Local address not yet configured!\n",
990 p->name);
991 else if (!ipv6_addr_is_multicast(raddr) &&
992 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
993 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
994 p->name);
995 else
996 ret = 1;
997 rcu_read_unlock();
998 }
999 return ret;
1000 }
1001 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1002
1003 /**
1004 * ip6_tnl_xmit - encapsulate packet and send
1005 * @skb: the outgoing socket buffer
1006 * @dev: the outgoing tunnel device
1007 * @dsfield: dscp code for outer header
1008 * @fl6: flow of tunneled packet
1009 * @encap_limit: encapsulation limit
1010 * @pmtu: Path MTU is stored if packet is too big
1011 * @proto: next header value
1012 *
1013 * Description:
1014 * Build new header and do some sanity checks on the packet before sending
1015 * it.
1016 *
1017 * Return:
1018 * 0 on success
1019 * -1 fail
1020 * %-EMSGSIZE message too big. return mtu in this case.
1021 **/
1022
1023 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1024 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1025 __u8 proto)
1026 {
1027 struct ip6_tnl *t = netdev_priv(dev);
1028 struct net *net = t->net;
1029 struct net_device_stats *stats = &t->dev->stats;
1030 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1031 struct ipv6_tel_txoption opt;
1032 struct dst_entry *dst = NULL, *ndst = NULL;
1033 struct net_device *tdev;
1034 int mtu;
1035 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1036 unsigned int max_headroom = psh_hlen;
1037 bool use_cache = false;
1038 u8 hop_limit;
1039 int err = -1;
1040
1041 if (t->parms.collect_md) {
1042 hop_limit = skb_tunnel_info(skb)->key.ttl;
1043 goto route_lookup;
1044 } else {
1045 hop_limit = t->parms.hop_limit;
1046 }
1047
1048 /* NBMA tunnel */
1049 if (ipv6_addr_any(&t->parms.raddr)) {
1050 struct in6_addr *addr6;
1051 struct neighbour *neigh;
1052 int addr_type;
1053
1054 if (!skb_dst(skb))
1055 goto tx_err_link_failure;
1056
1057 neigh = dst_neigh_lookup(skb_dst(skb),
1058 &ipv6_hdr(skb)->daddr);
1059 if (!neigh)
1060 goto tx_err_link_failure;
1061
1062 addr6 = (struct in6_addr *)&neigh->primary_key;
1063 addr_type = ipv6_addr_type(addr6);
1064
1065 if (addr_type == IPV6_ADDR_ANY)
1066 addr6 = &ipv6_hdr(skb)->daddr;
1067
1068 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1069 neigh_release(neigh);
1070 } else if (!(t->parms.flags &
1071 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) {
1072 /* enable the cache only only if the routing decision does
1073 * not depend on the current inner header value
1074 */
1075 use_cache = true;
1076 }
1077
1078 if (use_cache)
1079 dst = dst_cache_get(&t->dst_cache);
1080
1081 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1082 goto tx_err_link_failure;
1083
1084 if (!dst) {
1085 route_lookup:
1086 dst = ip6_route_output(net, NULL, fl6);
1087
1088 if (dst->error)
1089 goto tx_err_link_failure;
1090 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1091 if (IS_ERR(dst)) {
1092 err = PTR_ERR(dst);
1093 dst = NULL;
1094 goto tx_err_link_failure;
1095 }
1096 if (t->parms.collect_md &&
1097 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1098 &fl6->daddr, 0, &fl6->saddr))
1099 goto tx_err_link_failure;
1100 ndst = dst;
1101 }
1102
1103 tdev = dst->dev;
1104
1105 if (tdev == dev) {
1106 stats->collisions++;
1107 net_warn_ratelimited("%s: Local routing loop detected!\n",
1108 t->parms.name);
1109 goto tx_err_dst_release;
1110 }
1111 mtu = dst_mtu(dst) - psh_hlen;
1112 if (encap_limit >= 0) {
1113 max_headroom += 8;
1114 mtu -= 8;
1115 }
1116 if (mtu < IPV6_MIN_MTU)
1117 mtu = IPV6_MIN_MTU;
1118 if (skb_dst(skb) && !t->parms.collect_md)
1119 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1120 if (skb->len > mtu && !skb_is_gso(skb)) {
1121 *pmtu = mtu;
1122 err = -EMSGSIZE;
1123 goto tx_err_dst_release;
1124 }
1125
1126 if (t->err_count > 0) {
1127 if (time_before(jiffies,
1128 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1129 t->err_count--;
1130
1131 dst_link_failure(skb);
1132 } else {
1133 t->err_count = 0;
1134 }
1135 }
1136
1137 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1138
1139 /*
1140 * Okay, now see if we can stuff it in the buffer as-is.
1141 */
1142 max_headroom += LL_RESERVED_SPACE(tdev);
1143
1144 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1145 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1146 struct sk_buff *new_skb;
1147
1148 new_skb = skb_realloc_headroom(skb, max_headroom);
1149 if (!new_skb)
1150 goto tx_err_dst_release;
1151
1152 if (skb->sk)
1153 skb_set_owner_w(new_skb, skb->sk);
1154 consume_skb(skb);
1155 skb = new_skb;
1156 }
1157
1158 if (t->parms.collect_md) {
1159 if (t->encap.type != TUNNEL_ENCAP_NONE)
1160 goto tx_err_dst_release;
1161 } else {
1162 if (use_cache && ndst)
1163 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1164 }
1165 skb_dst_set(skb, dst);
1166
1167 if (encap_limit >= 0) {
1168 init_tel_txopt(&opt, encap_limit);
1169 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL, NULL);
1170 }
1171
1172 /* Calculate max headroom for all the headers and adjust
1173 * needed_headroom if necessary.
1174 */
1175 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1176 + dst->header_len + t->hlen;
1177 if (max_headroom > dev->needed_headroom)
1178 dev->needed_headroom = max_headroom;
1179
1180 err = ip6_tnl_encap(skb, t, &proto, fl6);
1181 if (err)
1182 return err;
1183
1184 skb_push(skb, sizeof(struct ipv6hdr));
1185 skb_reset_network_header(skb);
1186 ipv6h = ipv6_hdr(skb);
1187 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1188 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1189 ipv6h->hop_limit = hop_limit;
1190 ipv6h->nexthdr = proto;
1191 ipv6h->saddr = fl6->saddr;
1192 ipv6h->daddr = fl6->daddr;
1193 ip6tunnel_xmit(NULL, skb, dev);
1194 return 0;
1195 tx_err_link_failure:
1196 stats->tx_carrier_errors++;
1197 dst_link_failure(skb);
1198 tx_err_dst_release:
1199 dst_release(dst);
1200 return err;
1201 }
1202 EXPORT_SYMBOL(ip6_tnl_xmit);
1203
1204 static inline int
1205 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1206 {
1207 struct ip6_tnl *t = netdev_priv(dev);
1208 const struct iphdr *iph = ip_hdr(skb);
1209 int encap_limit = -1;
1210 struct flowi6 fl6;
1211 __u8 dsfield;
1212 __u32 mtu;
1213 u8 tproto;
1214 int err;
1215
1216 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1217
1218 tproto = ACCESS_ONCE(t->parms.proto);
1219 if (tproto != IPPROTO_IPIP && tproto != 0)
1220 return -1;
1221
1222 dsfield = ipv4_get_dsfield(iph);
1223
1224 if (t->parms.collect_md) {
1225 struct ip_tunnel_info *tun_info;
1226 const struct ip_tunnel_key *key;
1227
1228 tun_info = skb_tunnel_info(skb);
1229 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1230 ip_tunnel_info_af(tun_info) != AF_INET6))
1231 return -1;
1232 key = &tun_info->key;
1233 memset(&fl6, 0, sizeof(fl6));
1234 fl6.flowi6_proto = IPPROTO_IPIP;
1235 fl6.daddr = key->u.ipv6.dst;
1236 fl6.flowlabel = key->label;
1237 } else {
1238 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1239 encap_limit = t->parms.encap_limit;
1240
1241 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1242 fl6.flowi6_proto = IPPROTO_IPIP;
1243
1244 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1245 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1246 & IPV6_TCLASS_MASK;
1247 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1248 fl6.flowi6_mark = skb->mark;
1249 }
1250
1251 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1252
1253 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1254 return -1;
1255
1256 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1257
1258 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1259 IPPROTO_IPIP);
1260 if (err != 0) {
1261 /* XXX: send ICMP error even if DF is not set. */
1262 if (err == -EMSGSIZE)
1263 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1264 htonl(mtu));
1265 return -1;
1266 }
1267
1268 return 0;
1269 }
1270
1271 static inline int
1272 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1273 {
1274 struct ip6_tnl *t = netdev_priv(dev);
1275 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1276 int encap_limit = -1;
1277 __u16 offset;
1278 struct flowi6 fl6;
1279 __u8 dsfield;
1280 __u32 mtu;
1281 u8 tproto;
1282 int err;
1283
1284 tproto = ACCESS_ONCE(t->parms.proto);
1285 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1286 ip6_tnl_addr_conflict(t, ipv6h))
1287 return -1;
1288
1289 dsfield = ipv6_get_dsfield(ipv6h);
1290
1291 if (t->parms.collect_md) {
1292 struct ip_tunnel_info *tun_info;
1293 const struct ip_tunnel_key *key;
1294
1295 tun_info = skb_tunnel_info(skb);
1296 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1297 ip_tunnel_info_af(tun_info) != AF_INET6))
1298 return -1;
1299 key = &tun_info->key;
1300 memset(&fl6, 0, sizeof(fl6));
1301 fl6.flowi6_proto = IPPROTO_IPV6;
1302 fl6.daddr = key->u.ipv6.dst;
1303 fl6.flowlabel = key->label;
1304 } else {
1305 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1306 if (offset > 0) {
1307 struct ipv6_tlv_tnl_enc_lim *tel;
1308
1309 tel = (void *)&skb_network_header(skb)[offset];
1310 if (tel->encap_limit == 0) {
1311 icmpv6_send(skb, ICMPV6_PARAMPROB,
1312 ICMPV6_HDR_FIELD, offset + 2);
1313 return -1;
1314 }
1315 encap_limit = tel->encap_limit - 1;
1316 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1317 encap_limit = t->parms.encap_limit;
1318 }
1319
1320 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1321 fl6.flowi6_proto = IPPROTO_IPV6;
1322
1323 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1324 fl6.flowlabel |= (*(__be32 *)ipv6h & IPV6_TCLASS_MASK);
1325 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1326 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1327 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1328 fl6.flowi6_mark = skb->mark;
1329 }
1330
1331 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1332
1333 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1334 return -1;
1335
1336 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1337
1338 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1339 IPPROTO_IPV6);
1340 if (err != 0) {
1341 if (err == -EMSGSIZE)
1342 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1343 return -1;
1344 }
1345
1346 return 0;
1347 }
1348
1349 static netdev_tx_t
1350 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1351 {
1352 struct ip6_tnl *t = netdev_priv(dev);
1353 struct net_device_stats *stats = &t->dev->stats;
1354 int ret;
1355
1356 switch (skb->protocol) {
1357 case htons(ETH_P_IP):
1358 ret = ip4ip6_tnl_xmit(skb, dev);
1359 break;
1360 case htons(ETH_P_IPV6):
1361 ret = ip6ip6_tnl_xmit(skb, dev);
1362 break;
1363 default:
1364 goto tx_err;
1365 }
1366
1367 if (ret < 0)
1368 goto tx_err;
1369
1370 return NETDEV_TX_OK;
1371
1372 tx_err:
1373 stats->tx_errors++;
1374 stats->tx_dropped++;
1375 kfree_skb(skb);
1376 return NETDEV_TX_OK;
1377 }
1378
1379 static void ip6_tnl_link_config(struct ip6_tnl *t)
1380 {
1381 struct net_device *dev = t->dev;
1382 struct __ip6_tnl_parm *p = &t->parms;
1383 struct flowi6 *fl6 = &t->fl.u.ip6;
1384 int t_hlen;
1385
1386 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1387 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1388
1389 /* Set up flowi template */
1390 fl6->saddr = p->laddr;
1391 fl6->daddr = p->raddr;
1392 fl6->flowi6_oif = p->link;
1393 fl6->flowlabel = 0;
1394
1395 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1396 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1397 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1398 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1399
1400 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1401 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1402
1403 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1404 dev->flags |= IFF_POINTOPOINT;
1405 else
1406 dev->flags &= ~IFF_POINTOPOINT;
1407
1408 t->tun_hlen = 0;
1409 t->hlen = t->encap_hlen + t->tun_hlen;
1410 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1411
1412 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1413 int strict = (ipv6_addr_type(&p->raddr) &
1414 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1415
1416 struct rt6_info *rt = rt6_lookup(t->net,
1417 &p->raddr, &p->laddr,
1418 p->link, strict);
1419
1420 if (!rt)
1421 return;
1422
1423 if (rt->dst.dev) {
1424 dev->hard_header_len = rt->dst.dev->hard_header_len +
1425 t_hlen;
1426
1427 dev->mtu = rt->dst.dev->mtu - t_hlen;
1428 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1429 dev->mtu -= 8;
1430
1431 if (dev->mtu < IPV6_MIN_MTU)
1432 dev->mtu = IPV6_MIN_MTU;
1433 }
1434 ip6_rt_put(rt);
1435 }
1436 }
1437
1438 /**
1439 * ip6_tnl_change - update the tunnel parameters
1440 * @t: tunnel to be changed
1441 * @p: tunnel configuration parameters
1442 *
1443 * Description:
1444 * ip6_tnl_change() updates the tunnel parameters
1445 **/
1446
1447 static int
1448 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1449 {
1450 t->parms.laddr = p->laddr;
1451 t->parms.raddr = p->raddr;
1452 t->parms.flags = p->flags;
1453 t->parms.hop_limit = p->hop_limit;
1454 t->parms.encap_limit = p->encap_limit;
1455 t->parms.flowinfo = p->flowinfo;
1456 t->parms.link = p->link;
1457 t->parms.proto = p->proto;
1458 dst_cache_reset(&t->dst_cache);
1459 ip6_tnl_link_config(t);
1460 return 0;
1461 }
1462
1463 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1464 {
1465 struct net *net = t->net;
1466 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1467 int err;
1468
1469 ip6_tnl_unlink(ip6n, t);
1470 synchronize_net();
1471 err = ip6_tnl_change(t, p);
1472 ip6_tnl_link(ip6n, t);
1473 netdev_state_change(t->dev);
1474 return err;
1475 }
1476
1477 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1478 {
1479 /* for default tnl0 device allow to change only the proto */
1480 t->parms.proto = p->proto;
1481 netdev_state_change(t->dev);
1482 return 0;
1483 }
1484
1485 static void
1486 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1487 {
1488 p->laddr = u->laddr;
1489 p->raddr = u->raddr;
1490 p->flags = u->flags;
1491 p->hop_limit = u->hop_limit;
1492 p->encap_limit = u->encap_limit;
1493 p->flowinfo = u->flowinfo;
1494 p->link = u->link;
1495 p->proto = u->proto;
1496 memcpy(p->name, u->name, sizeof(u->name));
1497 }
1498
1499 static void
1500 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1501 {
1502 u->laddr = p->laddr;
1503 u->raddr = p->raddr;
1504 u->flags = p->flags;
1505 u->hop_limit = p->hop_limit;
1506 u->encap_limit = p->encap_limit;
1507 u->flowinfo = p->flowinfo;
1508 u->link = p->link;
1509 u->proto = p->proto;
1510 memcpy(u->name, p->name, sizeof(u->name));
1511 }
1512
1513 /**
1514 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1515 * @dev: virtual device associated with tunnel
1516 * @ifr: parameters passed from userspace
1517 * @cmd: command to be performed
1518 *
1519 * Description:
1520 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1521 * from userspace.
1522 *
1523 * The possible commands are the following:
1524 * %SIOCGETTUNNEL: get tunnel parameters for device
1525 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1526 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1527 * %SIOCDELTUNNEL: delete tunnel
1528 *
1529 * The fallback device "ip6tnl0", created during module
1530 * initialization, can be used for creating other tunnel devices.
1531 *
1532 * Return:
1533 * 0 on success,
1534 * %-EFAULT if unable to copy data to or from userspace,
1535 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1536 * %-EINVAL if passed tunnel parameters are invalid,
1537 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1538 * %-ENODEV if attempting to change or delete a nonexisting device
1539 **/
1540
1541 static int
1542 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1543 {
1544 int err = 0;
1545 struct ip6_tnl_parm p;
1546 struct __ip6_tnl_parm p1;
1547 struct ip6_tnl *t = netdev_priv(dev);
1548 struct net *net = t->net;
1549 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1550
1551 memset(&p1, 0, sizeof(p1));
1552
1553 switch (cmd) {
1554 case SIOCGETTUNNEL:
1555 if (dev == ip6n->fb_tnl_dev) {
1556 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1557 err = -EFAULT;
1558 break;
1559 }
1560 ip6_tnl_parm_from_user(&p1, &p);
1561 t = ip6_tnl_locate(net, &p1, 0);
1562 if (IS_ERR(t))
1563 t = netdev_priv(dev);
1564 } else {
1565 memset(&p, 0, sizeof(p));
1566 }
1567 ip6_tnl_parm_to_user(&p, &t->parms);
1568 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1569 err = -EFAULT;
1570 }
1571 break;
1572 case SIOCADDTUNNEL:
1573 case SIOCCHGTUNNEL:
1574 err = -EPERM;
1575 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1576 break;
1577 err = -EFAULT;
1578 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1579 break;
1580 err = -EINVAL;
1581 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1582 p.proto != 0)
1583 break;
1584 ip6_tnl_parm_from_user(&p1, &p);
1585 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1586 if (cmd == SIOCCHGTUNNEL) {
1587 if (!IS_ERR(t)) {
1588 if (t->dev != dev) {
1589 err = -EEXIST;
1590 break;
1591 }
1592 } else
1593 t = netdev_priv(dev);
1594 if (dev == ip6n->fb_tnl_dev)
1595 err = ip6_tnl0_update(t, &p1);
1596 else
1597 err = ip6_tnl_update(t, &p1);
1598 }
1599 if (!IS_ERR(t)) {
1600 err = 0;
1601 ip6_tnl_parm_to_user(&p, &t->parms);
1602 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1603 err = -EFAULT;
1604
1605 } else {
1606 err = PTR_ERR(t);
1607 }
1608 break;
1609 case SIOCDELTUNNEL:
1610 err = -EPERM;
1611 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1612 break;
1613
1614 if (dev == ip6n->fb_tnl_dev) {
1615 err = -EFAULT;
1616 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1617 break;
1618 err = -ENOENT;
1619 ip6_tnl_parm_from_user(&p1, &p);
1620 t = ip6_tnl_locate(net, &p1, 0);
1621 if (IS_ERR(t))
1622 break;
1623 err = -EPERM;
1624 if (t->dev == ip6n->fb_tnl_dev)
1625 break;
1626 dev = t->dev;
1627 }
1628 err = 0;
1629 unregister_netdevice(dev);
1630 break;
1631 default:
1632 err = -EINVAL;
1633 }
1634 return err;
1635 }
1636
1637 /**
1638 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1639 * @dev: virtual device associated with tunnel
1640 * @new_mtu: the new mtu
1641 *
1642 * Return:
1643 * 0 on success,
1644 * %-EINVAL if mtu too small
1645 **/
1646
1647 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1648 {
1649 struct ip6_tnl *tnl = netdev_priv(dev);
1650
1651 if (tnl->parms.proto == IPPROTO_IPIP) {
1652 if (new_mtu < ETH_MIN_MTU)
1653 return -EINVAL;
1654 } else {
1655 if (new_mtu < IPV6_MIN_MTU)
1656 return -EINVAL;
1657 }
1658 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1659 return -EINVAL;
1660 dev->mtu = new_mtu;
1661 return 0;
1662 }
1663 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1664
1665 int ip6_tnl_get_iflink(const struct net_device *dev)
1666 {
1667 struct ip6_tnl *t = netdev_priv(dev);
1668
1669 return t->parms.link;
1670 }
1671 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1672
1673 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1674 unsigned int num)
1675 {
1676 if (num >= MAX_IPTUN_ENCAP_OPS)
1677 return -ERANGE;
1678
1679 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1680 &ip6tun_encaps[num],
1681 NULL, ops) ? 0 : -1;
1682 }
1683 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1684
1685 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1686 unsigned int num)
1687 {
1688 int ret;
1689
1690 if (num >= MAX_IPTUN_ENCAP_OPS)
1691 return -ERANGE;
1692
1693 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1694 &ip6tun_encaps[num],
1695 ops, NULL) == ops) ? 0 : -1;
1696
1697 synchronize_net();
1698
1699 return ret;
1700 }
1701 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1702
1703 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1704 struct ip_tunnel_encap *ipencap)
1705 {
1706 int hlen;
1707
1708 memset(&t->encap, 0, sizeof(t->encap));
1709
1710 hlen = ip6_encap_hlen(ipencap);
1711 if (hlen < 0)
1712 return hlen;
1713
1714 t->encap.type = ipencap->type;
1715 t->encap.sport = ipencap->sport;
1716 t->encap.dport = ipencap->dport;
1717 t->encap.flags = ipencap->flags;
1718
1719 t->encap_hlen = hlen;
1720 t->hlen = t->encap_hlen + t->tun_hlen;
1721
1722 return 0;
1723 }
1724 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1725
1726 static const struct net_device_ops ip6_tnl_netdev_ops = {
1727 .ndo_init = ip6_tnl_dev_init,
1728 .ndo_uninit = ip6_tnl_dev_uninit,
1729 .ndo_start_xmit = ip6_tnl_start_xmit,
1730 .ndo_do_ioctl = ip6_tnl_ioctl,
1731 .ndo_change_mtu = ip6_tnl_change_mtu,
1732 .ndo_get_stats = ip6_get_stats,
1733 .ndo_get_iflink = ip6_tnl_get_iflink,
1734 };
1735
1736 #define IPXIPX_FEATURES (NETIF_F_SG | \
1737 NETIF_F_FRAGLIST | \
1738 NETIF_F_HIGHDMA | \
1739 NETIF_F_GSO_SOFTWARE | \
1740 NETIF_F_HW_CSUM)
1741
1742 /**
1743 * ip6_tnl_dev_setup - setup virtual tunnel device
1744 * @dev: virtual device associated with tunnel
1745 *
1746 * Description:
1747 * Initialize function pointers and device parameters
1748 **/
1749
1750 static void ip6_tnl_dev_setup(struct net_device *dev)
1751 {
1752 dev->netdev_ops = &ip6_tnl_netdev_ops;
1753 dev->destructor = ip6_dev_free;
1754
1755 dev->type = ARPHRD_TUNNEL6;
1756 dev->flags |= IFF_NOARP;
1757 dev->addr_len = sizeof(struct in6_addr);
1758 dev->features |= NETIF_F_LLTX;
1759 netif_keep_dst(dev);
1760
1761 dev->features |= IPXIPX_FEATURES;
1762 dev->hw_features |= IPXIPX_FEATURES;
1763
1764 /* This perm addr will be used as interface identifier by IPv6 */
1765 dev->addr_assign_type = NET_ADDR_RANDOM;
1766 eth_random_addr(dev->perm_addr);
1767 }
1768
1769
1770 /**
1771 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1772 * @dev: virtual device associated with tunnel
1773 **/
1774
1775 static inline int
1776 ip6_tnl_dev_init_gen(struct net_device *dev)
1777 {
1778 struct ip6_tnl *t = netdev_priv(dev);
1779 int ret;
1780 int t_hlen;
1781
1782 t->dev = dev;
1783 t->net = dev_net(dev);
1784 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1785 if (!dev->tstats)
1786 return -ENOMEM;
1787
1788 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1789 if (ret)
1790 goto free_stats;
1791
1792 ret = gro_cells_init(&t->gro_cells, dev);
1793 if (ret)
1794 goto destroy_dst;
1795
1796 t->tun_hlen = 0;
1797 t->hlen = t->encap_hlen + t->tun_hlen;
1798 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1799
1800 dev->type = ARPHRD_TUNNEL6;
1801 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1802 dev->mtu = ETH_DATA_LEN - t_hlen;
1803 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1804 dev->mtu -= 8;
1805 dev->min_mtu = ETH_MIN_MTU;
1806 dev->max_mtu = 0xFFF8 - dev->hard_header_len;
1807
1808 return 0;
1809
1810 destroy_dst:
1811 dst_cache_destroy(&t->dst_cache);
1812 free_stats:
1813 free_percpu(dev->tstats);
1814 dev->tstats = NULL;
1815
1816 return ret;
1817 }
1818
1819 /**
1820 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1821 * @dev: virtual device associated with tunnel
1822 **/
1823
1824 static int ip6_tnl_dev_init(struct net_device *dev)
1825 {
1826 struct ip6_tnl *t = netdev_priv(dev);
1827 int err = ip6_tnl_dev_init_gen(dev);
1828
1829 if (err)
1830 return err;
1831 ip6_tnl_link_config(t);
1832 if (t->parms.collect_md) {
1833 dev->features |= NETIF_F_NETNS_LOCAL;
1834 netif_keep_dst(dev);
1835 }
1836 return 0;
1837 }
1838
1839 /**
1840 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1841 * @dev: fallback device
1842 *
1843 * Return: 0
1844 **/
1845
1846 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1847 {
1848 struct ip6_tnl *t = netdev_priv(dev);
1849 struct net *net = dev_net(dev);
1850 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1851
1852 t->parms.proto = IPPROTO_IPV6;
1853 dev_hold(dev);
1854
1855 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1856 return 0;
1857 }
1858
1859 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1860 {
1861 u8 proto;
1862
1863 if (!data || !data[IFLA_IPTUN_PROTO])
1864 return 0;
1865
1866 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1867 if (proto != IPPROTO_IPV6 &&
1868 proto != IPPROTO_IPIP &&
1869 proto != 0)
1870 return -EINVAL;
1871
1872 return 0;
1873 }
1874
1875 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1876 struct __ip6_tnl_parm *parms)
1877 {
1878 memset(parms, 0, sizeof(*parms));
1879
1880 if (!data)
1881 return;
1882
1883 if (data[IFLA_IPTUN_LINK])
1884 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1885
1886 if (data[IFLA_IPTUN_LOCAL])
1887 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1888
1889 if (data[IFLA_IPTUN_REMOTE])
1890 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1891
1892 if (data[IFLA_IPTUN_TTL])
1893 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1894
1895 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1896 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1897
1898 if (data[IFLA_IPTUN_FLOWINFO])
1899 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1900
1901 if (data[IFLA_IPTUN_FLAGS])
1902 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1903
1904 if (data[IFLA_IPTUN_PROTO])
1905 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1906
1907 if (data[IFLA_IPTUN_COLLECT_METADATA])
1908 parms->collect_md = true;
1909 }
1910
1911 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1912 struct ip_tunnel_encap *ipencap)
1913 {
1914 bool ret = false;
1915
1916 memset(ipencap, 0, sizeof(*ipencap));
1917
1918 if (!data)
1919 return ret;
1920
1921 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1922 ret = true;
1923 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1924 }
1925
1926 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1927 ret = true;
1928 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1929 }
1930
1931 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1932 ret = true;
1933 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1934 }
1935
1936 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1937 ret = true;
1938 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1939 }
1940
1941 return ret;
1942 }
1943
1944 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1945 struct nlattr *tb[], struct nlattr *data[])
1946 {
1947 struct net *net = dev_net(dev);
1948 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1949 struct ip6_tnl *nt, *t;
1950 struct ip_tunnel_encap ipencap;
1951
1952 nt = netdev_priv(dev);
1953
1954 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1955 int err = ip6_tnl_encap_setup(nt, &ipencap);
1956
1957 if (err < 0)
1958 return err;
1959 }
1960
1961 ip6_tnl_netlink_parms(data, &nt->parms);
1962
1963 if (nt->parms.collect_md) {
1964 if (rtnl_dereference(ip6n->collect_md_tun))
1965 return -EEXIST;
1966 } else {
1967 t = ip6_tnl_locate(net, &nt->parms, 0);
1968 if (!IS_ERR(t))
1969 return -EEXIST;
1970 }
1971
1972 return ip6_tnl_create2(dev);
1973 }
1974
1975 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1976 struct nlattr *data[])
1977 {
1978 struct ip6_tnl *t = netdev_priv(dev);
1979 struct __ip6_tnl_parm p;
1980 struct net *net = t->net;
1981 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1982 struct ip_tunnel_encap ipencap;
1983
1984 if (dev == ip6n->fb_tnl_dev)
1985 return -EINVAL;
1986
1987 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1988 int err = ip6_tnl_encap_setup(t, &ipencap);
1989
1990 if (err < 0)
1991 return err;
1992 }
1993 ip6_tnl_netlink_parms(data, &p);
1994 if (p.collect_md)
1995 return -EINVAL;
1996
1997 t = ip6_tnl_locate(net, &p, 0);
1998 if (!IS_ERR(t)) {
1999 if (t->dev != dev)
2000 return -EEXIST;
2001 } else
2002 t = netdev_priv(dev);
2003
2004 return ip6_tnl_update(t, &p);
2005 }
2006
2007 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2008 {
2009 struct net *net = dev_net(dev);
2010 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2011
2012 if (dev != ip6n->fb_tnl_dev)
2013 unregister_netdevice_queue(dev, head);
2014 }
2015
2016 static size_t ip6_tnl_get_size(const struct net_device *dev)
2017 {
2018 return
2019 /* IFLA_IPTUN_LINK */
2020 nla_total_size(4) +
2021 /* IFLA_IPTUN_LOCAL */
2022 nla_total_size(sizeof(struct in6_addr)) +
2023 /* IFLA_IPTUN_REMOTE */
2024 nla_total_size(sizeof(struct in6_addr)) +
2025 /* IFLA_IPTUN_TTL */
2026 nla_total_size(1) +
2027 /* IFLA_IPTUN_ENCAP_LIMIT */
2028 nla_total_size(1) +
2029 /* IFLA_IPTUN_FLOWINFO */
2030 nla_total_size(4) +
2031 /* IFLA_IPTUN_FLAGS */
2032 nla_total_size(4) +
2033 /* IFLA_IPTUN_PROTO */
2034 nla_total_size(1) +
2035 /* IFLA_IPTUN_ENCAP_TYPE */
2036 nla_total_size(2) +
2037 /* IFLA_IPTUN_ENCAP_FLAGS */
2038 nla_total_size(2) +
2039 /* IFLA_IPTUN_ENCAP_SPORT */
2040 nla_total_size(2) +
2041 /* IFLA_IPTUN_ENCAP_DPORT */
2042 nla_total_size(2) +
2043 /* IFLA_IPTUN_COLLECT_METADATA */
2044 nla_total_size(0) +
2045 0;
2046 }
2047
2048 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2049 {
2050 struct ip6_tnl *tunnel = netdev_priv(dev);
2051 struct __ip6_tnl_parm *parm = &tunnel->parms;
2052
2053 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2054 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2055 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2056 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2057 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2058 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2059 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2060 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
2061 goto nla_put_failure;
2062
2063 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2064 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2065 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2066 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2067 goto nla_put_failure;
2068
2069 if (parm->collect_md)
2070 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2071 goto nla_put_failure;
2072 return 0;
2073
2074 nla_put_failure:
2075 return -EMSGSIZE;
2076 }
2077
2078 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2079 {
2080 struct ip6_tnl *tunnel = netdev_priv(dev);
2081
2082 return tunnel->net;
2083 }
2084 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2085
2086 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2087 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2088 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2089 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2090 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2091 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2092 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2093 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2094 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2095 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2096 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2097 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2098 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2099 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2100 };
2101
2102 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2103 .kind = "ip6tnl",
2104 .maxtype = IFLA_IPTUN_MAX,
2105 .policy = ip6_tnl_policy,
2106 .priv_size = sizeof(struct ip6_tnl),
2107 .setup = ip6_tnl_dev_setup,
2108 .validate = ip6_tnl_validate,
2109 .newlink = ip6_tnl_newlink,
2110 .changelink = ip6_tnl_changelink,
2111 .dellink = ip6_tnl_dellink,
2112 .get_size = ip6_tnl_get_size,
2113 .fill_info = ip6_tnl_fill_info,
2114 .get_link_net = ip6_tnl_get_link_net,
2115 };
2116
2117 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2118 .handler = ip4ip6_rcv,
2119 .err_handler = ip4ip6_err,
2120 .priority = 1,
2121 };
2122
2123 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2124 .handler = ip6ip6_rcv,
2125 .err_handler = ip6ip6_err,
2126 .priority = 1,
2127 };
2128
2129 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
2130 {
2131 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2132 struct net_device *dev, *aux;
2133 int h;
2134 struct ip6_tnl *t;
2135 LIST_HEAD(list);
2136
2137 for_each_netdev_safe(net, dev, aux)
2138 if (dev->rtnl_link_ops == &ip6_link_ops)
2139 unregister_netdevice_queue(dev, &list);
2140
2141 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2142 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2143 while (t) {
2144 /* If dev is in the same netns, it has already
2145 * been added to the list by the previous loop.
2146 */
2147 if (!net_eq(dev_net(t->dev), net))
2148 unregister_netdevice_queue(t->dev, &list);
2149 t = rtnl_dereference(t->next);
2150 }
2151 }
2152
2153 unregister_netdevice_many(&list);
2154 }
2155
2156 static int __net_init ip6_tnl_init_net(struct net *net)
2157 {
2158 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2159 struct ip6_tnl *t = NULL;
2160 int err;
2161
2162 ip6n->tnls[0] = ip6n->tnls_wc;
2163 ip6n->tnls[1] = ip6n->tnls_r_l;
2164
2165 err = -ENOMEM;
2166 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2167 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2168
2169 if (!ip6n->fb_tnl_dev)
2170 goto err_alloc_dev;
2171 dev_net_set(ip6n->fb_tnl_dev, net);
2172 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2173 /* FB netdevice is special: we have one, and only one per netns.
2174 * Allowing to move it to another netns is clearly unsafe.
2175 */
2176 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2177
2178 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2179 if (err < 0)
2180 goto err_register;
2181
2182 err = register_netdev(ip6n->fb_tnl_dev);
2183 if (err < 0)
2184 goto err_register;
2185
2186 t = netdev_priv(ip6n->fb_tnl_dev);
2187
2188 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2189 return 0;
2190
2191 err_register:
2192 ip6_dev_free(ip6n->fb_tnl_dev);
2193 err_alloc_dev:
2194 return err;
2195 }
2196
2197 static void __net_exit ip6_tnl_exit_net(struct net *net)
2198 {
2199 rtnl_lock();
2200 ip6_tnl_destroy_tunnels(net);
2201 rtnl_unlock();
2202 }
2203
2204 static struct pernet_operations ip6_tnl_net_ops = {
2205 .init = ip6_tnl_init_net,
2206 .exit = ip6_tnl_exit_net,
2207 .id = &ip6_tnl_net_id,
2208 .size = sizeof(struct ip6_tnl_net),
2209 };
2210
2211 /**
2212 * ip6_tunnel_init - register protocol and reserve needed resources
2213 *
2214 * Return: 0 on success
2215 **/
2216
2217 static int __init ip6_tunnel_init(void)
2218 {
2219 int err;
2220
2221 err = register_pernet_device(&ip6_tnl_net_ops);
2222 if (err < 0)
2223 goto out_pernet;
2224
2225 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2226 if (err < 0) {
2227 pr_err("%s: can't register ip4ip6\n", __func__);
2228 goto out_ip4ip6;
2229 }
2230
2231 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2232 if (err < 0) {
2233 pr_err("%s: can't register ip6ip6\n", __func__);
2234 goto out_ip6ip6;
2235 }
2236 err = rtnl_link_register(&ip6_link_ops);
2237 if (err < 0)
2238 goto rtnl_link_failed;
2239
2240 return 0;
2241
2242 rtnl_link_failed:
2243 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2244 out_ip6ip6:
2245 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2246 out_ip4ip6:
2247 unregister_pernet_device(&ip6_tnl_net_ops);
2248 out_pernet:
2249 return err;
2250 }
2251
2252 /**
2253 * ip6_tunnel_cleanup - free resources and unregister protocol
2254 **/
2255
2256 static void __exit ip6_tunnel_cleanup(void)
2257 {
2258 rtnl_link_unregister(&ip6_link_ops);
2259 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2260 pr_info("%s: can't deregister ip4ip6\n", __func__);
2261
2262 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2263 pr_info("%s: can't deregister ip6ip6\n", __func__);
2264
2265 unregister_pernet_device(&ip6_tnl_net_ops);
2266 }
2267
2268 module_init(ip6_tunnel_init);
2269 module_exit(ip6_tunnel_cleanup);
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