1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 tunneling device
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Ville Nuorvala <vnuorval@tcs.hut.fi>
8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
9 *
10 * Based on:
11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
12 *
13 * RFC 2473
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/sockios.h>
23 #include <linux/icmp.h>
24 #include <linux/if.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/icmpv6.h>
32 #include <linux/init.h>
33 #include <linux/route.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/netfilter_ipv6.h>
36 #include <linux/slab.h>
37 #include <linux/hash.h>
38 #include <linux/etherdevice.h>
39
40 #include <linux/uaccess.h>
41 #include <linux/atomic.h>
42
43 #include <net/icmp.h>
44 #include <net/ip.h>
45 #include <net/ip_tunnels.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/xfrm.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55 #include <net/dst_metadata.h>
56
57 MODULE_AUTHOR("Ville Nuorvala");
58 MODULE_DESCRIPTION("IPv6 tunneling device");
59 MODULE_LICENSE("GPL");
60 MODULE_ALIAS_RTNL_LINK("ip6tnl");
61 MODULE_ALIAS_NETDEV("ip6tnl0");
62
63 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
64 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
65
66 static bool log_ecn_error = true;
67 module_param(log_ecn_error, bool, 0644);
68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
69
HASH(const struct in6_addr * addr1,const struct in6_addr * addr2)70 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
71 {
72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
73
74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
75 }
76
77 static int ip6_tnl_dev_init(struct net_device *dev);
78 static void ip6_tnl_dev_setup(struct net_device *dev);
79 static struct rtnl_link_ops ip6_link_ops __read_mostly;
80
81 static unsigned int ip6_tnl_net_id __read_mostly;
82 struct ip6_tnl_net {
83 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
85 /* lists for storing tunnels in use */
86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
87 struct ip6_tnl __rcu *tnls_wc[1];
88 struct ip6_tnl __rcu **tnls[2];
89 struct ip6_tnl __rcu *collect_md_tun;
90 };
91
ip6_tnl_mpls_supported(void)92 static inline int ip6_tnl_mpls_supported(void)
93 {
94 return IS_ENABLED(CONFIG_MPLS);
95 }
96
97 #define for_each_ip6_tunnel_rcu(start) \
98 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
99
100 /**
101 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
102 * @net: network namespace
103 * @link: ifindex of underlying interface
104 * @remote: the address of the tunnel exit-point
105 * @local: the address of the tunnel entry-point
106 *
107 * Return:
108 * tunnel matching given end-points if found,
109 * else fallback tunnel if its device is up,
110 * else %NULL
111 **/
112
113 static struct ip6_tnl *
ip6_tnl_lookup(struct net * net,int link,const struct in6_addr * remote,const struct in6_addr * local)114 ip6_tnl_lookup(struct net *net, int link,
115 const struct in6_addr *remote, const struct in6_addr *local)
116 {
117 unsigned int hash = HASH(remote, local);
118 struct ip6_tnl *t, *cand = NULL;
119 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
120 struct in6_addr any;
121
122 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
123 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
124 !ipv6_addr_equal(remote, &t->parms.raddr) ||
125 !(t->dev->flags & IFF_UP))
126 continue;
127
128 if (link == t->parms.link)
129 return t;
130 else
131 cand = t;
132 }
133
134 memset(&any, 0, sizeof(any));
135 hash = HASH(&any, local);
136 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_any(&t->parms.raddr) ||
139 !(t->dev->flags & IFF_UP))
140 continue;
141
142 if (link == t->parms.link)
143 return t;
144 else if (!cand)
145 cand = t;
146 }
147
148 hash = HASH(remote, &any);
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
151 !ipv6_addr_any(&t->parms.laddr) ||
152 !(t->dev->flags & IFF_UP))
153 continue;
154
155 if (link == t->parms.link)
156 return t;
157 else if (!cand)
158 cand = t;
159 }
160
161 if (cand)
162 return cand;
163
164 t = rcu_dereference(ip6n->collect_md_tun);
165 if (t && t->dev->flags & IFF_UP)
166 return t;
167
168 t = rcu_dereference(ip6n->tnls_wc[0]);
169 if (t && (t->dev->flags & IFF_UP))
170 return t;
171
172 return NULL;
173 }
174
175 /**
176 * ip6_tnl_bucket - get head of list matching given tunnel parameters
177 * @ip6n: the private data for ip6_vti in the netns
178 * @p: parameters containing tunnel end-points
179 *
180 * Description:
181 * ip6_tnl_bucket() returns the head of the list matching the
182 * &struct in6_addr entries laddr and raddr in @p.
183 *
184 * Return: head of IPv6 tunnel list
185 **/
186
187 static struct ip6_tnl __rcu **
ip6_tnl_bucket(struct ip6_tnl_net * ip6n,const struct __ip6_tnl_parm * p)188 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
189 {
190 const struct in6_addr *remote = &p->raddr;
191 const struct in6_addr *local = &p->laddr;
192 unsigned int h = 0;
193 int prio = 0;
194
195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
196 prio = 1;
197 h = HASH(remote, local);
198 }
199 return &ip6n->tnls[prio][h];
200 }
201
202 /**
203 * ip6_tnl_link - add tunnel to hash table
204 * @ip6n: the private data for ip6_vti in the netns
205 * @t: tunnel to be added
206 **/
207
208 static void
ip6_tnl_link(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)209 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
210 {
211 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
212
213 if (t->parms.collect_md)
214 rcu_assign_pointer(ip6n->collect_md_tun, t);
215 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
216 rcu_assign_pointer(*tp, t);
217 }
218
219 /**
220 * ip6_tnl_unlink - remove tunnel from hash table
221 * @ip6n: the private data for ip6_vti in the netns
222 * @t: tunnel to be removed
223 **/
224
225 static void
ip6_tnl_unlink(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)226 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
227 {
228 struct ip6_tnl __rcu **tp;
229 struct ip6_tnl *iter;
230
231 if (t->parms.collect_md)
232 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
233
234 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
235 (iter = rtnl_dereference(*tp)) != NULL;
236 tp = &iter->next) {
237 if (t == iter) {
238 rcu_assign_pointer(*tp, t->next);
239 break;
240 }
241 }
242 }
243
ip6_dev_free(struct net_device * dev)244 static void ip6_dev_free(struct net_device *dev)
245 {
246 struct ip6_tnl *t = netdev_priv(dev);
247
248 gro_cells_destroy(&t->gro_cells);
249 dst_cache_destroy(&t->dst_cache);
250 free_percpu(dev->tstats);
251 }
252
ip6_tnl_create2(struct net_device * dev)253 static int ip6_tnl_create2(struct net_device *dev)
254 {
255 struct ip6_tnl *t = netdev_priv(dev);
256 struct net *net = dev_net(dev);
257 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
258 int err;
259
260 dev->rtnl_link_ops = &ip6_link_ops;
261 err = register_netdevice(dev);
262 if (err < 0)
263 goto out;
264
265 strcpy(t->parms.name, dev->name);
266
267 ip6_tnl_link(ip6n, t);
268 return 0;
269
270 out:
271 return err;
272 }
273
274 /**
275 * ip6_tnl_create - create a new tunnel
276 * @net: network namespace
277 * @p: tunnel parameters
278 *
279 * Description:
280 * Create tunnel matching given parameters.
281 *
282 * Return:
283 * created tunnel or error pointer
284 **/
285
ip6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)286 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
287 {
288 struct net_device *dev;
289 struct ip6_tnl *t;
290 char name[IFNAMSIZ];
291 int err = -E2BIG;
292
293 if (p->name[0]) {
294 if (!dev_valid_name(p->name))
295 goto failed;
296 strscpy(name, p->name, IFNAMSIZ);
297 } else {
298 sprintf(name, "ip6tnl%%d");
299 }
300 err = -ENOMEM;
301 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
302 ip6_tnl_dev_setup);
303 if (!dev)
304 goto failed;
305
306 dev_net_set(dev, net);
307
308 t = netdev_priv(dev);
309 t->parms = *p;
310 t->net = dev_net(dev);
311 err = ip6_tnl_create2(dev);
312 if (err < 0)
313 goto failed_free;
314
315 return t;
316
317 failed_free:
318 free_netdev(dev);
319 failed:
320 return ERR_PTR(err);
321 }
322
323 /**
324 * ip6_tnl_locate - find or create tunnel matching given parameters
325 * @net: network namespace
326 * @p: tunnel parameters
327 * @create: != 0 if allowed to create new tunnel if no match found
328 *
329 * Description:
330 * ip6_tnl_locate() first tries to locate an existing tunnel
331 * based on @parms. If this is unsuccessful, but @create is set a new
332 * tunnel device is created and registered for use.
333 *
334 * Return:
335 * matching tunnel or error pointer
336 **/
337
ip6_tnl_locate(struct net * net,struct __ip6_tnl_parm * p,int create)338 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
339 struct __ip6_tnl_parm *p, int create)
340 {
341 const struct in6_addr *remote = &p->raddr;
342 const struct in6_addr *local = &p->laddr;
343 struct ip6_tnl __rcu **tp;
344 struct ip6_tnl *t;
345 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
346
347 for (tp = ip6_tnl_bucket(ip6n, p);
348 (t = rtnl_dereference(*tp)) != NULL;
349 tp = &t->next) {
350 if (ipv6_addr_equal(local, &t->parms.laddr) &&
351 ipv6_addr_equal(remote, &t->parms.raddr) &&
352 p->link == t->parms.link) {
353 if (create)
354 return ERR_PTR(-EEXIST);
355
356 return t;
357 }
358 }
359 if (!create)
360 return ERR_PTR(-ENODEV);
361 return ip6_tnl_create(net, p);
362 }
363
364 /**
365 * ip6_tnl_dev_uninit - tunnel device uninitializer
366 * @dev: the device to be destroyed
367 *
368 * Description:
369 * ip6_tnl_dev_uninit() removes tunnel from its list
370 **/
371
372 static void
ip6_tnl_dev_uninit(struct net_device * dev)373 ip6_tnl_dev_uninit(struct net_device *dev)
374 {
375 struct ip6_tnl *t = netdev_priv(dev);
376 struct net *net = t->net;
377 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
378
379 if (dev == ip6n->fb_tnl_dev)
380 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
381 else
382 ip6_tnl_unlink(ip6n, t);
383 dst_cache_reset(&t->dst_cache);
384 netdev_put(dev, &t->dev_tracker);
385 }
386
387 /**
388 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
389 * @skb: received socket buffer
390 * @raw: the ICMPv6 error message data
391 *
392 * Return:
393 * 0 if none was found,
394 * else index to encapsulation limit
395 **/
396
ip6_tnl_parse_tlv_enc_lim(struct sk_buff * skb,__u8 * raw)397 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
398 {
399 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
400 unsigned int nhoff = raw - skb->data;
401 unsigned int off = nhoff + sizeof(*ipv6h);
402 u8 nexthdr = ipv6h->nexthdr;
403
404 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
405 struct ipv6_opt_hdr *hdr;
406 u16 optlen;
407
408 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
409 break;
410
411 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
412 if (nexthdr == NEXTHDR_FRAGMENT) {
413 optlen = 8;
414 } else if (nexthdr == NEXTHDR_AUTH) {
415 optlen = ipv6_authlen(hdr);
416 } else {
417 optlen = ipv6_optlen(hdr);
418 }
419
420 if (!pskb_may_pull(skb, off + optlen))
421 break;
422
423 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
424 if (nexthdr == NEXTHDR_FRAGMENT) {
425 struct frag_hdr *frag_hdr = (struct frag_hdr *)hdr;
426
427 if (frag_hdr->frag_off)
428 break;
429 }
430 if (nexthdr == NEXTHDR_DEST) {
431 u16 i = 2;
432
433 while (1) {
434 struct ipv6_tlv_tnl_enc_lim *tel;
435
436 /* No more room for encapsulation limit */
437 if (i + sizeof(*tel) > optlen)
438 break;
439
440 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
441 /* return index of option if found and valid */
442 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
443 tel->length == 1)
444 return i + off - nhoff;
445 /* else jump to next option */
446 if (tel->type)
447 i += tel->length + 2;
448 else
449 i++;
450 }
451 }
452 nexthdr = hdr->nexthdr;
453 off += optlen;
454 }
455 return 0;
456 }
457 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
458
459 /* ip6_tnl_err() should handle errors in the tunnel according to the
460 * specifications in RFC 2473.
461 */
462 static int
ip6_tnl_err(struct sk_buff * skb,__u8 ipproto,struct inet6_skb_parm * opt,u8 * type,u8 * code,int * msg,__u32 * info,int offset)463 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
464 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
465 {
466 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
467 struct net *net = dev_net(skb->dev);
468 u8 rel_type = ICMPV6_DEST_UNREACH;
469 u8 rel_code = ICMPV6_ADDR_UNREACH;
470 __u32 rel_info = 0;
471 struct ip6_tnl *t;
472 int err = -ENOENT;
473 int rel_msg = 0;
474 u8 tproto;
475 __u16 len;
476
477 /* If the packet doesn't contain the original IPv6 header we are
478 in trouble since we might need the source address for further
479 processing of the error. */
480
481 rcu_read_lock();
482 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
483 if (!t)
484 goto out;
485
486 tproto = READ_ONCE(t->parms.proto);
487 if (tproto != ipproto && tproto != 0)
488 goto out;
489
490 err = 0;
491
492 switch (*type) {
493 case ICMPV6_DEST_UNREACH:
494 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
495 t->parms.name);
496 rel_msg = 1;
497 break;
498 case ICMPV6_TIME_EXCEED:
499 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
500 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
501 t->parms.name);
502 rel_msg = 1;
503 }
504 break;
505 case ICMPV6_PARAMPROB: {
506 struct ipv6_tlv_tnl_enc_lim *tel;
507 __u32 teli;
508
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_dbg_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_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
522 t->parms.name);
523 }
524 break;
525 }
526 case ICMPV6_PKT_TOOBIG: {
527 __u32 mtu;
528
529 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
530 sock_net_uid(net, NULL));
531 mtu = *info - offset;
532 if (mtu < IPV6_MIN_MTU)
533 mtu = IPV6_MIN_MTU;
534 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
535 if (len > mtu) {
536 rel_type = ICMPV6_PKT_TOOBIG;
537 rel_code = 0;
538 rel_info = mtu;
539 rel_msg = 1;
540 }
541 break;
542 }
543 case NDISC_REDIRECT:
544 ip6_redirect(skb, net, skb->dev->ifindex, 0,
545 sock_net_uid(net, NULL));
546 break;
547 }
548
549 *type = rel_type;
550 *code = rel_code;
551 *info = rel_info;
552 *msg = rel_msg;
553
554 out:
555 rcu_read_unlock();
556 return err;
557 }
558
559 static int
ip4ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)560 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
561 u8 type, u8 code, int offset, __be32 info)
562 {
563 __u32 rel_info = ntohl(info);
564 const struct iphdr *eiph;
565 struct sk_buff *skb2;
566 int err, rel_msg = 0;
567 u8 rel_type = type;
568 u8 rel_code = code;
569 struct rtable *rt;
570 struct flowi4 fl4;
571
572 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
573 &rel_msg, &rel_info, offset);
574 if (err < 0)
575 return err;
576
577 if (rel_msg == 0)
578 return 0;
579
580 switch (rel_type) {
581 case ICMPV6_DEST_UNREACH:
582 if (rel_code != ICMPV6_ADDR_UNREACH)
583 return 0;
584 rel_type = ICMP_DEST_UNREACH;
585 rel_code = ICMP_HOST_UNREACH;
586 break;
587 case ICMPV6_PKT_TOOBIG:
588 if (rel_code != 0)
589 return 0;
590 rel_type = ICMP_DEST_UNREACH;
591 rel_code = ICMP_FRAG_NEEDED;
592 break;
593 default:
594 return 0;
595 }
596
597 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
598 return 0;
599
600 skb2 = skb_clone(skb, GFP_ATOMIC);
601 if (!skb2)
602 return 0;
603
604 skb_dst_drop(skb2);
605
606 skb_pull(skb2, offset);
607 skb_reset_network_header(skb2);
608 eiph = ip_hdr(skb2);
609
610 /* Try to guess incoming interface */
611 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
612 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
613 if (IS_ERR(rt))
614 goto out;
615
616 skb2->dev = rt->dst.dev;
617 ip_rt_put(rt);
618
619 /* route "incoming" packet */
620 if (rt->rt_flags & RTCF_LOCAL) {
621 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
622 eiph->daddr, eiph->saddr, 0, 0,
623 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
624 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
625 if (!IS_ERR(rt))
626 ip_rt_put(rt);
627 goto out;
628 }
629 skb_dst_set(skb2, &rt->dst);
630 } else {
631 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
632 skb2->dev) ||
633 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
634 goto out;
635 }
636
637 /* change mtu on this route */
638 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
639 if (rel_info > dst_mtu(skb_dst(skb2)))
640 goto out;
641
642 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
643 }
644
645 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
646
647 out:
648 kfree_skb(skb2);
649 return 0;
650 }
651
652 static int
ip6ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)653 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
654 u8 type, u8 code, int offset, __be32 info)
655 {
656 __u32 rel_info = ntohl(info);
657 int err, rel_msg = 0;
658 u8 rel_type = type;
659 u8 rel_code = code;
660
661 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
662 &rel_msg, &rel_info, offset);
663 if (err < 0)
664 return err;
665
666 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
667 struct rt6_info *rt;
668 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
669
670 if (!skb2)
671 return 0;
672
673 skb_dst_drop(skb2);
674 skb_pull(skb2, offset);
675 skb_reset_network_header(skb2);
676
677 /* Try to guess incoming interface */
678 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
679 NULL, 0, skb2, 0);
680
681 if (rt && rt->dst.dev)
682 skb2->dev = rt->dst.dev;
683
684 icmpv6_send(skb2, rel_type, rel_code, rel_info);
685
686 ip6_rt_put(rt);
687
688 kfree_skb(skb2);
689 }
690
691 return 0;
692 }
693
694 static int
mplsip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)695 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
696 u8 type, u8 code, int offset, __be32 info)
697 {
698 __u32 rel_info = ntohl(info);
699 int err, rel_msg = 0;
700 u8 rel_type = type;
701 u8 rel_code = code;
702
703 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
704 &rel_msg, &rel_info, offset);
705 return err;
706 }
707
ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)708 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
709 const struct ipv6hdr *ipv6h,
710 struct sk_buff *skb)
711 {
712 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
713
714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
715 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
716
717 return IP6_ECN_decapsulate(ipv6h, skb);
718 }
719
ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)720 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
721 const struct ipv6hdr *ipv6h,
722 struct sk_buff *skb)
723 {
724 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
725 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
726
727 return IP6_ECN_decapsulate(ipv6h, skb);
728 }
729
mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)730 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
731 const struct ipv6hdr *ipv6h,
732 struct sk_buff *skb)
733 {
734 /* ECN is not supported in AF_MPLS */
735 return 0;
736 }
737
ip6_tnl_get_cap(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)738 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
739 const struct in6_addr *laddr,
740 const struct in6_addr *raddr)
741 {
742 struct __ip6_tnl_parm *p = &t->parms;
743 int ltype = ipv6_addr_type(laddr);
744 int rtype = ipv6_addr_type(raddr);
745 __u32 flags = 0;
746
747 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
748 flags = IP6_TNL_F_CAP_PER_PACKET;
749 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
750 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
751 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
752 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
753 if (ltype&IPV6_ADDR_UNICAST)
754 flags |= IP6_TNL_F_CAP_XMIT;
755 if (rtype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_RCV;
757 }
758 return flags;
759 }
760 EXPORT_SYMBOL(ip6_tnl_get_cap);
761
762 /* called with rcu_read_lock() */
ip6_tnl_rcv_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)763 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
764 const struct in6_addr *laddr,
765 const struct in6_addr *raddr)
766 {
767 struct __ip6_tnl_parm *p = &t->parms;
768 int ret = 0;
769 struct net *net = t->net;
770
771 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
772 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
773 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
774 struct net_device *ldev = NULL;
775
776 if (p->link)
777 ldev = dev_get_by_index_rcu(net, p->link);
778
779 if ((ipv6_addr_is_multicast(laddr) ||
780 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
781 0, IFA_F_TENTATIVE))) &&
782 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
783 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
784 0, IFA_F_TENTATIVE))))
785 ret = 1;
786 }
787 return ret;
788 }
789 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
790
__ip6_tnl_rcv(struct ip6_tnl * tunnel,struct sk_buff * skb,const struct tnl_ptk_info * tpi,struct metadata_dst * tun_dst,int (* dscp_ecn_decapsulate)(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb),bool log_ecn_err)791 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
792 const struct tnl_ptk_info *tpi,
793 struct metadata_dst *tun_dst,
794 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
795 const struct ipv6hdr *ipv6h,
796 struct sk_buff *skb),
797 bool log_ecn_err)
798 {
799 const struct ipv6hdr *ipv6h;
800 int nh, err;
801
802 if ((!(tpi->flags & TUNNEL_CSUM) &&
803 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
804 ((tpi->flags & TUNNEL_CSUM) &&
805 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
806 DEV_STATS_INC(tunnel->dev, rx_crc_errors);
807 DEV_STATS_INC(tunnel->dev, rx_errors);
808 goto drop;
809 }
810
811 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
812 if (!(tpi->flags & TUNNEL_SEQ) ||
813 (tunnel->i_seqno &&
814 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
815 DEV_STATS_INC(tunnel->dev, rx_fifo_errors);
816 DEV_STATS_INC(tunnel->dev, rx_errors);
817 goto drop;
818 }
819 tunnel->i_seqno = ntohl(tpi->seq) + 1;
820 }
821
822 skb->protocol = tpi->proto;
823
824 /* Warning: All skb pointers will be invalidated! */
825 if (tunnel->dev->type == ARPHRD_ETHER) {
826 if (!pskb_may_pull(skb, ETH_HLEN)) {
827 DEV_STATS_INC(tunnel->dev, rx_length_errors);
828 DEV_STATS_INC(tunnel->dev, rx_errors);
829 goto drop;
830 }
831
832 skb->protocol = eth_type_trans(skb, tunnel->dev);
833 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
834 } else {
835 skb->dev = tunnel->dev;
836 skb_reset_mac_header(skb);
837 }
838
839 /* Save offset of outer header relative to skb->head,
840 * because we are going to reset the network header to the inner header
841 * and might change skb->head.
842 */
843 nh = skb_network_header(skb) - skb->head;
844
845 skb_reset_network_header(skb);
846
847 if (!pskb_inet_may_pull(skb)) {
848 DEV_STATS_INC(tunnel->dev, rx_length_errors);
849 DEV_STATS_INC(tunnel->dev, rx_errors);
850 goto drop;
851 }
852
853 /* Get the outer header. */
854 ipv6h = (struct ipv6hdr *)(skb->head + nh);
855
856 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
857
858 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
859
860 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
861 if (unlikely(err)) {
862 if (log_ecn_err)
863 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
864 &ipv6h->saddr,
865 ipv6_get_dsfield(ipv6h));
866 if (err > 1) {
867 DEV_STATS_INC(tunnel->dev, rx_frame_errors);
868 DEV_STATS_INC(tunnel->dev, rx_errors);
869 goto drop;
870 }
871 }
872
873 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
874
875 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
876
877 if (tun_dst)
878 skb_dst_set(skb, (struct dst_entry *)tun_dst);
879
880 gro_cells_receive(&tunnel->gro_cells, skb);
881 return 0;
882
883 drop:
884 if (tun_dst)
885 dst_release((struct dst_entry *)tun_dst);
886 kfree_skb(skb);
887 return 0;
888 }
889
ip6_tnl_rcv(struct ip6_tnl * t,struct sk_buff * skb,const struct tnl_ptk_info * tpi,struct metadata_dst * tun_dst,bool log_ecn_err)890 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
891 const struct tnl_ptk_info *tpi,
892 struct metadata_dst *tun_dst,
893 bool log_ecn_err)
894 {
895 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
896 const struct ipv6hdr *ipv6h,
897 struct sk_buff *skb);
898
899 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
900 if (tpi->proto == htons(ETH_P_IP))
901 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
902
903 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
904 log_ecn_err);
905 }
906 EXPORT_SYMBOL(ip6_tnl_rcv);
907
908 static const struct tnl_ptk_info tpi_v6 = {
909 /* no tunnel info required for ipxip6. */
910 .proto = htons(ETH_P_IPV6),
911 };
912
913 static const struct tnl_ptk_info tpi_v4 = {
914 /* no tunnel info required for ipxip6. */
915 .proto = htons(ETH_P_IP),
916 };
917
918 static const struct tnl_ptk_info tpi_mpls = {
919 /* no tunnel info required for mplsip6. */
920 .proto = htons(ETH_P_MPLS_UC),
921 };
922
ipxip6_rcv(struct sk_buff * skb,u8 ipproto,const struct tnl_ptk_info * tpi,int (* dscp_ecn_decapsulate)(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb))923 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
924 const struct tnl_ptk_info *tpi,
925 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
926 const struct ipv6hdr *ipv6h,
927 struct sk_buff *skb))
928 {
929 struct ip6_tnl *t;
930 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
931 struct metadata_dst *tun_dst = NULL;
932 int ret = -1;
933
934 rcu_read_lock();
935 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
936
937 if (t) {
938 u8 tproto = READ_ONCE(t->parms.proto);
939
940 if (tproto != ipproto && tproto != 0)
941 goto drop;
942 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
943 goto drop;
944 ipv6h = ipv6_hdr(skb);
945 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
946 goto drop;
947 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
948 goto drop;
949 if (t->parms.collect_md) {
950 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
951 if (!tun_dst)
952 goto drop;
953 }
954 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
955 log_ecn_error);
956 }
957
958 rcu_read_unlock();
959
960 return ret;
961
962 drop:
963 rcu_read_unlock();
964 kfree_skb(skb);
965 return 0;
966 }
967
ip4ip6_rcv(struct sk_buff * skb)968 static int ip4ip6_rcv(struct sk_buff *skb)
969 {
970 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
971 ip4ip6_dscp_ecn_decapsulate);
972 }
973
ip6ip6_rcv(struct sk_buff * skb)974 static int ip6ip6_rcv(struct sk_buff *skb)
975 {
976 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
977 ip6ip6_dscp_ecn_decapsulate);
978 }
979
mplsip6_rcv(struct sk_buff * skb)980 static int mplsip6_rcv(struct sk_buff *skb)
981 {
982 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
983 mplsip6_dscp_ecn_decapsulate);
984 }
985
986 struct ipv6_tel_txoption {
987 struct ipv6_txoptions ops;
988 __u8 dst_opt[8];
989 };
990
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)991 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
992 {
993 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
994
995 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
996 opt->dst_opt[3] = 1;
997 opt->dst_opt[4] = encap_limit;
998 opt->dst_opt[5] = IPV6_TLV_PADN;
999 opt->dst_opt[6] = 1;
1000
1001 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1002 opt->ops.opt_nflen = 8;
1003 }
1004
1005 /**
1006 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1007 * @t: the outgoing tunnel device
1008 * @hdr: IPv6 header from the incoming packet
1009 *
1010 * Description:
1011 * Avoid trivial tunneling loop by checking that tunnel exit-point
1012 * doesn't match source of incoming packet.
1013 *
1014 * Return:
1015 * 1 if conflict,
1016 * 0 else
1017 **/
1018
1019 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1020 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1021 {
1022 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1023 }
1024
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1025 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1026 const struct in6_addr *laddr,
1027 const struct in6_addr *raddr)
1028 {
1029 struct __ip6_tnl_parm *p = &t->parms;
1030 int ret = 0;
1031 struct net *net = t->net;
1032
1033 if (t->parms.collect_md)
1034 return 1;
1035
1036 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1037 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1038 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1039 struct net_device *ldev = NULL;
1040
1041 rcu_read_lock();
1042 if (p->link)
1043 ldev = dev_get_by_index_rcu(net, p->link);
1044
1045 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1046 0, IFA_F_TENTATIVE)))
1047 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1048 p->name);
1049 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1050 !ipv6_addr_is_multicast(raddr) &&
1051 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1052 true, 0, IFA_F_TENTATIVE)))
1053 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1054 p->name);
1055 else
1056 ret = 1;
1057 rcu_read_unlock();
1058 }
1059 return ret;
1060 }
1061 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1062
1063 /**
1064 * ip6_tnl_xmit - encapsulate packet and send
1065 * @skb: the outgoing socket buffer
1066 * @dev: the outgoing tunnel device
1067 * @dsfield: dscp code for outer header
1068 * @fl6: flow of tunneled packet
1069 * @encap_limit: encapsulation limit
1070 * @pmtu: Path MTU is stored if packet is too big
1071 * @proto: next header value
1072 *
1073 * Description:
1074 * Build new header and do some sanity checks on the packet before sending
1075 * it.
1076 *
1077 * Return:
1078 * 0 on success
1079 * -1 fail
1080 * %-EMSGSIZE message too big. return mtu in this case.
1081 **/
1082
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1083 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1084 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1085 __u8 proto)
1086 {
1087 struct ip6_tnl *t = netdev_priv(dev);
1088 struct net *net = t->net;
1089 struct ipv6hdr *ipv6h;
1090 struct ipv6_tel_txoption opt;
1091 struct dst_entry *dst = NULL, *ndst = NULL;
1092 struct net_device *tdev;
1093 int mtu;
1094 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1095 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1096 unsigned int max_headroom = psh_hlen;
1097 __be16 payload_protocol;
1098 bool use_cache = false;
1099 u8 hop_limit;
1100 int err = -1;
1101
1102 payload_protocol = skb_protocol(skb, true);
1103
1104 if (t->parms.collect_md) {
1105 hop_limit = skb_tunnel_info(skb)->key.ttl;
1106 goto route_lookup;
1107 } else {
1108 hop_limit = t->parms.hop_limit;
1109 }
1110
1111 /* NBMA tunnel */
1112 if (ipv6_addr_any(&t->parms.raddr)) {
1113 if (payload_protocol == htons(ETH_P_IPV6)) {
1114 struct in6_addr *addr6;
1115 struct neighbour *neigh;
1116 int addr_type;
1117
1118 if (!skb_dst(skb))
1119 goto tx_err_link_failure;
1120
1121 neigh = dst_neigh_lookup(skb_dst(skb),
1122 &ipv6_hdr(skb)->daddr);
1123 if (!neigh)
1124 goto tx_err_link_failure;
1125
1126 addr6 = (struct in6_addr *)&neigh->primary_key;
1127 addr_type = ipv6_addr_type(addr6);
1128
1129 if (addr_type == IPV6_ADDR_ANY)
1130 addr6 = &ipv6_hdr(skb)->daddr;
1131
1132 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1133 neigh_release(neigh);
1134 } else if (payload_protocol == htons(ETH_P_IP)) {
1135 const struct rtable *rt = skb_rtable(skb);
1136
1137 if (!rt)
1138 goto tx_err_link_failure;
1139
1140 if (rt->rt_gw_family == AF_INET6)
1141 memcpy(&fl6->daddr, &rt->rt_gw6, sizeof(fl6->daddr));
1142 }
1143 } else if (t->parms.proto != 0 && !(t->parms.flags &
1144 (IP6_TNL_F_USE_ORIG_TCLASS |
1145 IP6_TNL_F_USE_ORIG_FWMARK))) {
1146 /* enable the cache only if neither the outer protocol nor the
1147 * routing decision depends on the current inner header value
1148 */
1149 use_cache = true;
1150 }
1151
1152 if (use_cache)
1153 dst = dst_cache_get(&t->dst_cache);
1154
1155 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1156 goto tx_err_link_failure;
1157
1158 if (!dst) {
1159 route_lookup:
1160 /* add dsfield to flowlabel for route lookup */
1161 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1162
1163 dst = ip6_route_output(net, NULL, fl6);
1164
1165 if (dst->error)
1166 goto tx_err_link_failure;
1167 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1168 if (IS_ERR(dst)) {
1169 err = PTR_ERR(dst);
1170 dst = NULL;
1171 goto tx_err_link_failure;
1172 }
1173 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1174 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1175 &fl6->daddr, 0, &fl6->saddr))
1176 goto tx_err_link_failure;
1177 ndst = dst;
1178 }
1179
1180 tdev = dst->dev;
1181
1182 if (tdev == dev) {
1183 DEV_STATS_INC(dev, collisions);
1184 net_warn_ratelimited("%s: Local routing loop detected!\n",
1185 t->parms.name);
1186 goto tx_err_dst_release;
1187 }
1188 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1189 if (encap_limit >= 0) {
1190 max_headroom += 8;
1191 mtu -= 8;
1192 }
1193 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1194 IPV6_MIN_MTU : IPV4_MIN_MTU);
1195
1196 skb_dst_update_pmtu_no_confirm(skb, mtu);
1197 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1198 *pmtu = mtu;
1199 err = -EMSGSIZE;
1200 goto tx_err_dst_release;
1201 }
1202
1203 if (t->err_count > 0) {
1204 if (time_before(jiffies,
1205 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1206 t->err_count--;
1207
1208 dst_link_failure(skb);
1209 } else {
1210 t->err_count = 0;
1211 }
1212 }
1213
1214 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1215
1216 /*
1217 * Okay, now see if we can stuff it in the buffer as-is.
1218 */
1219 max_headroom += LL_RESERVED_SPACE(tdev);
1220
1221 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1222 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1223 struct sk_buff *new_skb;
1224
1225 new_skb = skb_realloc_headroom(skb, max_headroom);
1226 if (!new_skb)
1227 goto tx_err_dst_release;
1228
1229 if (skb->sk)
1230 skb_set_owner_w(new_skb, skb->sk);
1231 consume_skb(skb);
1232 skb = new_skb;
1233 }
1234
1235 if (t->parms.collect_md) {
1236 if (t->encap.type != TUNNEL_ENCAP_NONE)
1237 goto tx_err_dst_release;
1238 } else {
1239 if (use_cache && ndst)
1240 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1241 }
1242 skb_dst_set(skb, dst);
1243
1244 if (hop_limit == 0) {
1245 if (payload_protocol == htons(ETH_P_IP))
1246 hop_limit = ip_hdr(skb)->ttl;
1247 else if (payload_protocol == htons(ETH_P_IPV6))
1248 hop_limit = ipv6_hdr(skb)->hop_limit;
1249 else
1250 hop_limit = ip6_dst_hoplimit(dst);
1251 }
1252
1253 /* Calculate max headroom for all the headers and adjust
1254 * needed_headroom if necessary.
1255 */
1256 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1257 + dst->header_len + t->hlen;
1258 if (max_headroom > READ_ONCE(dev->needed_headroom))
1259 WRITE_ONCE(dev->needed_headroom, max_headroom);
1260
1261 err = ip6_tnl_encap(skb, t, &proto, fl6);
1262 if (err)
1263 return err;
1264
1265 if (encap_limit >= 0) {
1266 init_tel_txopt(&opt, encap_limit);
1267 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1268 }
1269
1270 skb_push(skb, sizeof(struct ipv6hdr));
1271 skb_reset_network_header(skb);
1272 ipv6h = ipv6_hdr(skb);
1273 ip6_flow_hdr(ipv6h, dsfield,
1274 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1275 ipv6h->hop_limit = hop_limit;
1276 ipv6h->nexthdr = proto;
1277 ipv6h->saddr = fl6->saddr;
1278 ipv6h->daddr = fl6->daddr;
1279 ip6tunnel_xmit(NULL, skb, dev);
1280 return 0;
1281 tx_err_link_failure:
1282 DEV_STATS_INC(dev, tx_carrier_errors);
1283 dst_link_failure(skb);
1284 tx_err_dst_release:
1285 dst_release(dst);
1286 return err;
1287 }
1288 EXPORT_SYMBOL(ip6_tnl_xmit);
1289
1290 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1291 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1292 u8 protocol)
1293 {
1294 struct ip6_tnl *t = netdev_priv(dev);
1295 struct ipv6hdr *ipv6h;
1296 const struct iphdr *iph;
1297 int encap_limit = -1;
1298 __u16 offset;
1299 struct flowi6 fl6;
1300 __u8 dsfield, orig_dsfield;
1301 __u32 mtu;
1302 u8 tproto;
1303 int err;
1304
1305 tproto = READ_ONCE(t->parms.proto);
1306 if (tproto != protocol && tproto != 0)
1307 return -1;
1308
1309 if (t->parms.collect_md) {
1310 struct ip_tunnel_info *tun_info;
1311 const struct ip_tunnel_key *key;
1312
1313 tun_info = skb_tunnel_info(skb);
1314 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1315 ip_tunnel_info_af(tun_info) != AF_INET6))
1316 return -1;
1317 key = &tun_info->key;
1318 memset(&fl6, 0, sizeof(fl6));
1319 fl6.flowi6_proto = protocol;
1320 fl6.saddr = key->u.ipv6.src;
1321 fl6.daddr = key->u.ipv6.dst;
1322 fl6.flowlabel = key->label;
1323 dsfield = key->tos;
1324 switch (protocol) {
1325 case IPPROTO_IPIP:
1326 iph = ip_hdr(skb);
1327 orig_dsfield = ipv4_get_dsfield(iph);
1328 break;
1329 case IPPROTO_IPV6:
1330 ipv6h = ipv6_hdr(skb);
1331 orig_dsfield = ipv6_get_dsfield(ipv6h);
1332 break;
1333 default:
1334 orig_dsfield = dsfield;
1335 break;
1336 }
1337 } else {
1338 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1339 encap_limit = t->parms.encap_limit;
1340 if (protocol == IPPROTO_IPV6) {
1341 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1342 skb_network_header(skb));
1343 /* ip6_tnl_parse_tlv_enc_lim() might have
1344 * reallocated skb->head
1345 */
1346 if (offset > 0) {
1347 struct ipv6_tlv_tnl_enc_lim *tel;
1348
1349 tel = (void *)&skb_network_header(skb)[offset];
1350 if (tel->encap_limit == 0) {
1351 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1352 ICMPV6_HDR_FIELD, offset + 2);
1353 return -1;
1354 }
1355 encap_limit = tel->encap_limit - 1;
1356 }
1357 }
1358
1359 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1360 fl6.flowi6_proto = protocol;
1361
1362 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1363 fl6.flowi6_mark = skb->mark;
1364 else
1365 fl6.flowi6_mark = t->parms.fwmark;
1366 switch (protocol) {
1367 case IPPROTO_IPIP:
1368 iph = ip_hdr(skb);
1369 orig_dsfield = ipv4_get_dsfield(iph);
1370 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1371 dsfield = orig_dsfield;
1372 else
1373 dsfield = ip6_tclass(t->parms.flowinfo);
1374 break;
1375 case IPPROTO_IPV6:
1376 ipv6h = ipv6_hdr(skb);
1377 orig_dsfield = ipv6_get_dsfield(ipv6h);
1378 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1379 dsfield = orig_dsfield;
1380 else
1381 dsfield = ip6_tclass(t->parms.flowinfo);
1382 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1383 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1384 break;
1385 default:
1386 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1387 break;
1388 }
1389 }
1390
1391 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1392 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1393
1394 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1395 return -1;
1396
1397 skb_set_inner_ipproto(skb, protocol);
1398
1399 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1400 protocol);
1401 if (err != 0) {
1402 /* XXX: send ICMP error even if DF is not set. */
1403 if (err == -EMSGSIZE)
1404 switch (protocol) {
1405 case IPPROTO_IPIP:
1406 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1407 ICMP_FRAG_NEEDED, htonl(mtu));
1408 break;
1409 case IPPROTO_IPV6:
1410 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1411 break;
1412 default:
1413 break;
1414 }
1415 return -1;
1416 }
1417
1418 return 0;
1419 }
1420
1421 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1422 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1423 {
1424 struct ip6_tnl *t = netdev_priv(dev);
1425 u8 ipproto;
1426 int ret;
1427
1428 if (!pskb_inet_may_pull(skb))
1429 goto tx_err;
1430
1431 switch (skb->protocol) {
1432 case htons(ETH_P_IP):
1433 ipproto = IPPROTO_IPIP;
1434 break;
1435 case htons(ETH_P_IPV6):
1436 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1437 goto tx_err;
1438 ipproto = IPPROTO_IPV6;
1439 break;
1440 case htons(ETH_P_MPLS_UC):
1441 ipproto = IPPROTO_MPLS;
1442 break;
1443 default:
1444 goto tx_err;
1445 }
1446
1447 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1448 if (ret < 0)
1449 goto tx_err;
1450
1451 return NETDEV_TX_OK;
1452
1453 tx_err:
1454 DEV_STATS_INC(dev, tx_errors);
1455 DEV_STATS_INC(dev, tx_dropped);
1456 kfree_skb(skb);
1457 return NETDEV_TX_OK;
1458 }
1459
ip6_tnl_link_config(struct ip6_tnl * t)1460 static void ip6_tnl_link_config(struct ip6_tnl *t)
1461 {
1462 struct net_device *dev = t->dev;
1463 struct net_device *tdev = NULL;
1464 struct __ip6_tnl_parm *p = &t->parms;
1465 struct flowi6 *fl6 = &t->fl.u.ip6;
1466 int t_hlen;
1467 int mtu;
1468
1469 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1470 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1471
1472 /* Set up flowi template */
1473 fl6->saddr = p->laddr;
1474 fl6->daddr = p->raddr;
1475 fl6->flowi6_oif = p->link;
1476 fl6->flowlabel = 0;
1477
1478 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1479 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1480 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1481 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1482
1483 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1484 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1485
1486 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1487 dev->flags |= IFF_POINTOPOINT;
1488 else
1489 dev->flags &= ~IFF_POINTOPOINT;
1490
1491 t->tun_hlen = 0;
1492 t->hlen = t->encap_hlen + t->tun_hlen;
1493 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1494
1495 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1496 int strict = (ipv6_addr_type(&p->raddr) &
1497 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1498
1499 struct rt6_info *rt = rt6_lookup(t->net,
1500 &p->raddr, &p->laddr,
1501 p->link, NULL, strict);
1502 if (rt) {
1503 tdev = rt->dst.dev;
1504 ip6_rt_put(rt);
1505 }
1506
1507 if (!tdev && p->link)
1508 tdev = __dev_get_by_index(t->net, p->link);
1509
1510 if (tdev) {
1511 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1512 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1513
1514 mtu = mtu - t_hlen;
1515 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1516 mtu -= 8;
1517
1518 if (mtu < IPV6_MIN_MTU)
1519 mtu = IPV6_MIN_MTU;
1520 WRITE_ONCE(dev->mtu, mtu);
1521 }
1522 }
1523 }
1524
1525 /**
1526 * ip6_tnl_change - update the tunnel parameters
1527 * @t: tunnel to be changed
1528 * @p: tunnel configuration parameters
1529 *
1530 * Description:
1531 * ip6_tnl_change() updates the tunnel parameters
1532 **/
1533
1534 static void
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1535 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1536 {
1537 t->parms.laddr = p->laddr;
1538 t->parms.raddr = p->raddr;
1539 t->parms.flags = p->flags;
1540 t->parms.hop_limit = p->hop_limit;
1541 t->parms.encap_limit = p->encap_limit;
1542 t->parms.flowinfo = p->flowinfo;
1543 t->parms.link = p->link;
1544 t->parms.proto = p->proto;
1545 t->parms.fwmark = p->fwmark;
1546 dst_cache_reset(&t->dst_cache);
1547 ip6_tnl_link_config(t);
1548 }
1549
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1550 static void ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1551 {
1552 struct net *net = t->net;
1553 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1554
1555 ip6_tnl_unlink(ip6n, t);
1556 synchronize_net();
1557 ip6_tnl_change(t, p);
1558 ip6_tnl_link(ip6n, t);
1559 netdev_state_change(t->dev);
1560 }
1561
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1562 static void ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1563 {
1564 /* for default tnl0 device allow to change only the proto */
1565 t->parms.proto = p->proto;
1566 netdev_state_change(t->dev);
1567 }
1568
1569 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1570 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1571 {
1572 p->laddr = u->laddr;
1573 p->raddr = u->raddr;
1574 p->flags = u->flags;
1575 p->hop_limit = u->hop_limit;
1576 p->encap_limit = u->encap_limit;
1577 p->flowinfo = u->flowinfo;
1578 p->link = u->link;
1579 p->proto = u->proto;
1580 memcpy(p->name, u->name, sizeof(u->name));
1581 }
1582
1583 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1584 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1585 {
1586 u->laddr = p->laddr;
1587 u->raddr = p->raddr;
1588 u->flags = p->flags;
1589 u->hop_limit = p->hop_limit;
1590 u->encap_limit = p->encap_limit;
1591 u->flowinfo = p->flowinfo;
1592 u->link = p->link;
1593 u->proto = p->proto;
1594 memcpy(u->name, p->name, sizeof(u->name));
1595 }
1596
1597 /**
1598 * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace
1599 * @dev: virtual device associated with tunnel
1600 * @ifr: unused
1601 * @data: parameters passed from userspace
1602 * @cmd: command to be performed
1603 *
1604 * Description:
1605 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1606 * from userspace.
1607 *
1608 * The possible commands are the following:
1609 * %SIOCGETTUNNEL: get tunnel parameters for device
1610 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1611 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1612 * %SIOCDELTUNNEL: delete tunnel
1613 *
1614 * The fallback device "ip6tnl0", created during module
1615 * initialization, can be used for creating other tunnel devices.
1616 *
1617 * Return:
1618 * 0 on success,
1619 * %-EFAULT if unable to copy data to or from userspace,
1620 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1621 * %-EINVAL if passed tunnel parameters are invalid,
1622 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1623 * %-ENODEV if attempting to change or delete a nonexisting device
1624 **/
1625
1626 static int
ip6_tnl_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1627 ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1628 void __user *data, int cmd)
1629 {
1630 int err = 0;
1631 struct ip6_tnl_parm p;
1632 struct __ip6_tnl_parm p1;
1633 struct ip6_tnl *t = netdev_priv(dev);
1634 struct net *net = t->net;
1635 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1636
1637 memset(&p1, 0, sizeof(p1));
1638
1639 switch (cmd) {
1640 case SIOCGETTUNNEL:
1641 if (dev == ip6n->fb_tnl_dev) {
1642 if (copy_from_user(&p, data, sizeof(p))) {
1643 err = -EFAULT;
1644 break;
1645 }
1646 ip6_tnl_parm_from_user(&p1, &p);
1647 t = ip6_tnl_locate(net, &p1, 0);
1648 if (IS_ERR(t))
1649 t = netdev_priv(dev);
1650 } else {
1651 memset(&p, 0, sizeof(p));
1652 }
1653 ip6_tnl_parm_to_user(&p, &t->parms);
1654 if (copy_to_user(data, &p, sizeof(p)))
1655 err = -EFAULT;
1656 break;
1657 case SIOCADDTUNNEL:
1658 case SIOCCHGTUNNEL:
1659 err = -EPERM;
1660 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1661 break;
1662 err = -EFAULT;
1663 if (copy_from_user(&p, data, sizeof(p)))
1664 break;
1665 err = -EINVAL;
1666 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1667 p.proto != 0)
1668 break;
1669 ip6_tnl_parm_from_user(&p1, &p);
1670 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1671 if (cmd == SIOCCHGTUNNEL) {
1672 if (!IS_ERR(t)) {
1673 if (t->dev != dev) {
1674 err = -EEXIST;
1675 break;
1676 }
1677 } else
1678 t = netdev_priv(dev);
1679 if (dev == ip6n->fb_tnl_dev)
1680 ip6_tnl0_update(t, &p1);
1681 else
1682 ip6_tnl_update(t, &p1);
1683 }
1684 if (!IS_ERR(t)) {
1685 err = 0;
1686 ip6_tnl_parm_to_user(&p, &t->parms);
1687 if (copy_to_user(data, &p, sizeof(p)))
1688 err = -EFAULT;
1689
1690 } else {
1691 err = PTR_ERR(t);
1692 }
1693 break;
1694 case SIOCDELTUNNEL:
1695 err = -EPERM;
1696 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1697 break;
1698
1699 if (dev == ip6n->fb_tnl_dev) {
1700 err = -EFAULT;
1701 if (copy_from_user(&p, data, sizeof(p)))
1702 break;
1703 err = -ENOENT;
1704 ip6_tnl_parm_from_user(&p1, &p);
1705 t = ip6_tnl_locate(net, &p1, 0);
1706 if (IS_ERR(t))
1707 break;
1708 err = -EPERM;
1709 if (t->dev == ip6n->fb_tnl_dev)
1710 break;
1711 dev = t->dev;
1712 }
1713 err = 0;
1714 unregister_netdevice(dev);
1715 break;
1716 default:
1717 err = -EINVAL;
1718 }
1719 return err;
1720 }
1721
1722 /**
1723 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1724 * @dev: virtual device associated with tunnel
1725 * @new_mtu: the new mtu
1726 *
1727 * Return:
1728 * 0 on success,
1729 * %-EINVAL if mtu too small
1730 **/
1731
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1732 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1733 {
1734 struct ip6_tnl *tnl = netdev_priv(dev);
1735
1736 if (tnl->parms.proto == IPPROTO_IPV6) {
1737 if (new_mtu < IPV6_MIN_MTU)
1738 return -EINVAL;
1739 } else {
1740 if (new_mtu < ETH_MIN_MTU)
1741 return -EINVAL;
1742 }
1743 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1744 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1745 return -EINVAL;
1746 } else {
1747 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1748 return -EINVAL;
1749 }
1750 dev->mtu = new_mtu;
1751 return 0;
1752 }
1753 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1754
ip6_tnl_get_iflink(const struct net_device * dev)1755 int ip6_tnl_get_iflink(const struct net_device *dev)
1756 {
1757 struct ip6_tnl *t = netdev_priv(dev);
1758
1759 return t->parms.link;
1760 }
1761 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1762
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1763 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1764 unsigned int num)
1765 {
1766 if (num >= MAX_IPTUN_ENCAP_OPS)
1767 return -ERANGE;
1768
1769 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1770 &ip6tun_encaps[num],
1771 NULL, ops) ? 0 : -1;
1772 }
1773 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1774
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1775 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1776 unsigned int num)
1777 {
1778 int ret;
1779
1780 if (num >= MAX_IPTUN_ENCAP_OPS)
1781 return -ERANGE;
1782
1783 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1784 &ip6tun_encaps[num],
1785 ops, NULL) == ops) ? 0 : -1;
1786
1787 synchronize_net();
1788
1789 return ret;
1790 }
1791 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1792
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1793 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1794 struct ip_tunnel_encap *ipencap)
1795 {
1796 int hlen;
1797
1798 memset(&t->encap, 0, sizeof(t->encap));
1799
1800 hlen = ip6_encap_hlen(ipencap);
1801 if (hlen < 0)
1802 return hlen;
1803
1804 t->encap.type = ipencap->type;
1805 t->encap.sport = ipencap->sport;
1806 t->encap.dport = ipencap->dport;
1807 t->encap.flags = ipencap->flags;
1808
1809 t->encap_hlen = hlen;
1810 t->hlen = t->encap_hlen + t->tun_hlen;
1811
1812 return 0;
1813 }
1814 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1815
1816 static const struct net_device_ops ip6_tnl_netdev_ops = {
1817 .ndo_init = ip6_tnl_dev_init,
1818 .ndo_uninit = ip6_tnl_dev_uninit,
1819 .ndo_start_xmit = ip6_tnl_start_xmit,
1820 .ndo_siocdevprivate = ip6_tnl_siocdevprivate,
1821 .ndo_change_mtu = ip6_tnl_change_mtu,
1822 .ndo_get_stats64 = dev_get_tstats64,
1823 .ndo_get_iflink = ip6_tnl_get_iflink,
1824 };
1825
1826 #define IPXIPX_FEATURES (NETIF_F_SG | \
1827 NETIF_F_FRAGLIST | \
1828 NETIF_F_HIGHDMA | \
1829 NETIF_F_GSO_SOFTWARE | \
1830 NETIF_F_HW_CSUM)
1831
1832 /**
1833 * ip6_tnl_dev_setup - setup virtual tunnel device
1834 * @dev: virtual device associated with tunnel
1835 *
1836 * Description:
1837 * Initialize function pointers and device parameters
1838 **/
1839
ip6_tnl_dev_setup(struct net_device * dev)1840 static void ip6_tnl_dev_setup(struct net_device *dev)
1841 {
1842 dev->netdev_ops = &ip6_tnl_netdev_ops;
1843 dev->header_ops = &ip_tunnel_header_ops;
1844 dev->needs_free_netdev = true;
1845 dev->priv_destructor = ip6_dev_free;
1846
1847 dev->type = ARPHRD_TUNNEL6;
1848 dev->flags |= IFF_NOARP;
1849 dev->addr_len = sizeof(struct in6_addr);
1850 dev->features |= NETIF_F_LLTX;
1851 netif_keep_dst(dev);
1852
1853 dev->features |= IPXIPX_FEATURES;
1854 dev->hw_features |= IPXIPX_FEATURES;
1855
1856 /* This perm addr will be used as interface identifier by IPv6 */
1857 dev->addr_assign_type = NET_ADDR_RANDOM;
1858 eth_random_addr(dev->perm_addr);
1859 }
1860
1861
1862 /**
1863 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1864 * @dev: virtual device associated with tunnel
1865 **/
1866
1867 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1868 ip6_tnl_dev_init_gen(struct net_device *dev)
1869 {
1870 struct ip6_tnl *t = netdev_priv(dev);
1871 int ret;
1872 int t_hlen;
1873
1874 t->dev = dev;
1875 t->net = dev_net(dev);
1876 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1877 if (!dev->tstats)
1878 return -ENOMEM;
1879
1880 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1881 if (ret)
1882 goto free_stats;
1883
1884 ret = gro_cells_init(&t->gro_cells, dev);
1885 if (ret)
1886 goto destroy_dst;
1887
1888 t->tun_hlen = 0;
1889 t->hlen = t->encap_hlen + t->tun_hlen;
1890 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1891
1892 dev->type = ARPHRD_TUNNEL6;
1893 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1894 dev->mtu = ETH_DATA_LEN - t_hlen;
1895 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1896 dev->mtu -= 8;
1897 dev->min_mtu = ETH_MIN_MTU;
1898 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1899
1900 netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
1901 return 0;
1902
1903 destroy_dst:
1904 dst_cache_destroy(&t->dst_cache);
1905 free_stats:
1906 free_percpu(dev->tstats);
1907 dev->tstats = NULL;
1908
1909 return ret;
1910 }
1911
1912 /**
1913 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1914 * @dev: virtual device associated with tunnel
1915 **/
1916
ip6_tnl_dev_init(struct net_device * dev)1917 static int ip6_tnl_dev_init(struct net_device *dev)
1918 {
1919 struct ip6_tnl *t = netdev_priv(dev);
1920 int err = ip6_tnl_dev_init_gen(dev);
1921
1922 if (err)
1923 return err;
1924 ip6_tnl_link_config(t);
1925 if (t->parms.collect_md)
1926 netif_keep_dst(dev);
1927 return 0;
1928 }
1929
1930 /**
1931 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1932 * @dev: fallback device
1933 *
1934 * Return: 0
1935 **/
1936
ip6_fb_tnl_dev_init(struct net_device * dev)1937 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1938 {
1939 struct ip6_tnl *t = netdev_priv(dev);
1940 struct net *net = dev_net(dev);
1941 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1942
1943 t->parms.proto = IPPROTO_IPV6;
1944
1945 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1946 return 0;
1947 }
1948
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1949 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1950 struct netlink_ext_ack *extack)
1951 {
1952 u8 proto;
1953
1954 if (!data || !data[IFLA_IPTUN_PROTO])
1955 return 0;
1956
1957 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1958 if (proto != IPPROTO_IPV6 &&
1959 proto != IPPROTO_IPIP &&
1960 proto != 0)
1961 return -EINVAL;
1962
1963 return 0;
1964 }
1965
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1966 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1967 struct __ip6_tnl_parm *parms)
1968 {
1969 memset(parms, 0, sizeof(*parms));
1970
1971 if (!data)
1972 return;
1973
1974 if (data[IFLA_IPTUN_LINK])
1975 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1976
1977 if (data[IFLA_IPTUN_LOCAL])
1978 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1979
1980 if (data[IFLA_IPTUN_REMOTE])
1981 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1982
1983 if (data[IFLA_IPTUN_TTL])
1984 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1985
1986 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1987 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1988
1989 if (data[IFLA_IPTUN_FLOWINFO])
1990 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1991
1992 if (data[IFLA_IPTUN_FLAGS])
1993 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1994
1995 if (data[IFLA_IPTUN_PROTO])
1996 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1997
1998 if (data[IFLA_IPTUN_COLLECT_METADATA])
1999 parms->collect_md = true;
2000
2001 if (data[IFLA_IPTUN_FWMARK])
2002 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2003 }
2004
ip6_tnl_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2005 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2006 struct nlattr *tb[], struct nlattr *data[],
2007 struct netlink_ext_ack *extack)
2008 {
2009 struct net *net = dev_net(dev);
2010 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2011 struct ip_tunnel_encap ipencap;
2012 struct ip6_tnl *nt, *t;
2013 int err;
2014
2015 nt = netdev_priv(dev);
2016
2017 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2018 err = ip6_tnl_encap_setup(nt, &ipencap);
2019 if (err < 0)
2020 return err;
2021 }
2022
2023 ip6_tnl_netlink_parms(data, &nt->parms);
2024
2025 if (nt->parms.collect_md) {
2026 if (rtnl_dereference(ip6n->collect_md_tun))
2027 return -EEXIST;
2028 } else {
2029 t = ip6_tnl_locate(net, &nt->parms, 0);
2030 if (!IS_ERR(t))
2031 return -EEXIST;
2032 }
2033
2034 err = ip6_tnl_create2(dev);
2035 if (!err && tb[IFLA_MTU])
2036 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2037
2038 return err;
2039 }
2040
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2041 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2042 struct nlattr *data[],
2043 struct netlink_ext_ack *extack)
2044 {
2045 struct ip6_tnl *t = netdev_priv(dev);
2046 struct __ip6_tnl_parm p;
2047 struct net *net = t->net;
2048 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2049 struct ip_tunnel_encap ipencap;
2050
2051 if (dev == ip6n->fb_tnl_dev)
2052 return -EINVAL;
2053
2054 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2055 int err = ip6_tnl_encap_setup(t, &ipencap);
2056
2057 if (err < 0)
2058 return err;
2059 }
2060 ip6_tnl_netlink_parms(data, &p);
2061 if (p.collect_md)
2062 return -EINVAL;
2063
2064 t = ip6_tnl_locate(net, &p, 0);
2065 if (!IS_ERR(t)) {
2066 if (t->dev != dev)
2067 return -EEXIST;
2068 } else
2069 t = netdev_priv(dev);
2070
2071 ip6_tnl_update(t, &p);
2072 return 0;
2073 }
2074
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2075 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2076 {
2077 struct net *net = dev_net(dev);
2078 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2079
2080 if (dev != ip6n->fb_tnl_dev)
2081 unregister_netdevice_queue(dev, head);
2082 }
2083
ip6_tnl_get_size(const struct net_device * dev)2084 static size_t ip6_tnl_get_size(const struct net_device *dev)
2085 {
2086 return
2087 /* IFLA_IPTUN_LINK */
2088 nla_total_size(4) +
2089 /* IFLA_IPTUN_LOCAL */
2090 nla_total_size(sizeof(struct in6_addr)) +
2091 /* IFLA_IPTUN_REMOTE */
2092 nla_total_size(sizeof(struct in6_addr)) +
2093 /* IFLA_IPTUN_TTL */
2094 nla_total_size(1) +
2095 /* IFLA_IPTUN_ENCAP_LIMIT */
2096 nla_total_size(1) +
2097 /* IFLA_IPTUN_FLOWINFO */
2098 nla_total_size(4) +
2099 /* IFLA_IPTUN_FLAGS */
2100 nla_total_size(4) +
2101 /* IFLA_IPTUN_PROTO */
2102 nla_total_size(1) +
2103 /* IFLA_IPTUN_ENCAP_TYPE */
2104 nla_total_size(2) +
2105 /* IFLA_IPTUN_ENCAP_FLAGS */
2106 nla_total_size(2) +
2107 /* IFLA_IPTUN_ENCAP_SPORT */
2108 nla_total_size(2) +
2109 /* IFLA_IPTUN_ENCAP_DPORT */
2110 nla_total_size(2) +
2111 /* IFLA_IPTUN_COLLECT_METADATA */
2112 nla_total_size(0) +
2113 /* IFLA_IPTUN_FWMARK */
2114 nla_total_size(4) +
2115 0;
2116 }
2117
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2118 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2119 {
2120 struct ip6_tnl *tunnel = netdev_priv(dev);
2121 struct __ip6_tnl_parm *parm = &tunnel->parms;
2122
2123 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2124 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2125 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2126 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2127 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2128 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2129 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2130 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2131 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2132 goto nla_put_failure;
2133
2134 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2135 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2136 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2137 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2138 goto nla_put_failure;
2139
2140 if (parm->collect_md)
2141 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2142 goto nla_put_failure;
2143
2144 return 0;
2145
2146 nla_put_failure:
2147 return -EMSGSIZE;
2148 }
2149
ip6_tnl_get_link_net(const struct net_device * dev)2150 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2151 {
2152 struct ip6_tnl *tunnel = netdev_priv(dev);
2153
2154 return tunnel->net;
2155 }
2156 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2157
2158 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2159 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2160 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2161 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2162 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2163 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2164 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2165 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2166 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2167 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2168 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2169 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2170 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2171 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2172 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2173 };
2174
2175 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2176 .kind = "ip6tnl",
2177 .maxtype = IFLA_IPTUN_MAX,
2178 .policy = ip6_tnl_policy,
2179 .priv_size = sizeof(struct ip6_tnl),
2180 .setup = ip6_tnl_dev_setup,
2181 .validate = ip6_tnl_validate,
2182 .newlink = ip6_tnl_newlink,
2183 .changelink = ip6_tnl_changelink,
2184 .dellink = ip6_tnl_dellink,
2185 .get_size = ip6_tnl_get_size,
2186 .fill_info = ip6_tnl_fill_info,
2187 .get_link_net = ip6_tnl_get_link_net,
2188 };
2189
2190 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2191 .handler = ip4ip6_rcv,
2192 .err_handler = ip4ip6_err,
2193 .priority = 1,
2194 };
2195
2196 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2197 .handler = ip6ip6_rcv,
2198 .err_handler = ip6ip6_err,
2199 .priority = 1,
2200 };
2201
2202 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2203 .handler = mplsip6_rcv,
2204 .err_handler = mplsip6_err,
2205 .priority = 1,
2206 };
2207
ip6_tnl_destroy_tunnels(struct net * net,struct list_head * list)2208 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2209 {
2210 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2211 struct net_device *dev, *aux;
2212 int h;
2213 struct ip6_tnl *t;
2214
2215 for_each_netdev_safe(net, dev, aux)
2216 if (dev->rtnl_link_ops == &ip6_link_ops)
2217 unregister_netdevice_queue(dev, list);
2218
2219 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2220 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2221 while (t) {
2222 /* If dev is in the same netns, it has already
2223 * been added to the list by the previous loop.
2224 */
2225 if (!net_eq(dev_net(t->dev), net))
2226 unregister_netdevice_queue(t->dev, list);
2227 t = rtnl_dereference(t->next);
2228 }
2229 }
2230
2231 t = rtnl_dereference(ip6n->tnls_wc[0]);
2232 while (t) {
2233 /* If dev is in the same netns, it has already
2234 * been added to the list by the previous loop.
2235 */
2236 if (!net_eq(dev_net(t->dev), net))
2237 unregister_netdevice_queue(t->dev, list);
2238 t = rtnl_dereference(t->next);
2239 }
2240 }
2241
ip6_tnl_init_net(struct net * net)2242 static int __net_init ip6_tnl_init_net(struct net *net)
2243 {
2244 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2245 struct ip6_tnl *t = NULL;
2246 int err;
2247
2248 ip6n->tnls[0] = ip6n->tnls_wc;
2249 ip6n->tnls[1] = ip6n->tnls_r_l;
2250
2251 if (!net_has_fallback_tunnels(net))
2252 return 0;
2253 err = -ENOMEM;
2254 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2255 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2256
2257 if (!ip6n->fb_tnl_dev)
2258 goto err_alloc_dev;
2259 dev_net_set(ip6n->fb_tnl_dev, net);
2260 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2261 /* FB netdevice is special: we have one, and only one per netns.
2262 * Allowing to move it to another netns is clearly unsafe.
2263 */
2264 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2265
2266 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2267 if (err < 0)
2268 goto err_register;
2269
2270 err = register_netdev(ip6n->fb_tnl_dev);
2271 if (err < 0)
2272 goto err_register;
2273
2274 t = netdev_priv(ip6n->fb_tnl_dev);
2275
2276 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2277 return 0;
2278
2279 err_register:
2280 free_netdev(ip6n->fb_tnl_dev);
2281 err_alloc_dev:
2282 return err;
2283 }
2284
ip6_tnl_exit_batch_net(struct list_head * net_list)2285 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2286 {
2287 struct net *net;
2288 LIST_HEAD(list);
2289
2290 rtnl_lock();
2291 list_for_each_entry(net, net_list, exit_list)
2292 ip6_tnl_destroy_tunnels(net, &list);
2293 unregister_netdevice_many(&list);
2294 rtnl_unlock();
2295 }
2296
2297 static struct pernet_operations ip6_tnl_net_ops = {
2298 .init = ip6_tnl_init_net,
2299 .exit_batch = ip6_tnl_exit_batch_net,
2300 .id = &ip6_tnl_net_id,
2301 .size = sizeof(struct ip6_tnl_net),
2302 };
2303
2304 /**
2305 * ip6_tunnel_init - register protocol and reserve needed resources
2306 *
2307 * Return: 0 on success
2308 **/
2309
ip6_tunnel_init(void)2310 static int __init ip6_tunnel_init(void)
2311 {
2312 int err;
2313
2314 if (!ipv6_mod_enabled())
2315 return -EOPNOTSUPP;
2316
2317 err = register_pernet_device(&ip6_tnl_net_ops);
2318 if (err < 0)
2319 goto out_pernet;
2320
2321 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2322 if (err < 0) {
2323 pr_err("%s: can't register ip4ip6\n", __func__);
2324 goto out_ip4ip6;
2325 }
2326
2327 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2328 if (err < 0) {
2329 pr_err("%s: can't register ip6ip6\n", __func__);
2330 goto out_ip6ip6;
2331 }
2332
2333 if (ip6_tnl_mpls_supported()) {
2334 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2335 if (err < 0) {
2336 pr_err("%s: can't register mplsip6\n", __func__);
2337 goto out_mplsip6;
2338 }
2339 }
2340
2341 err = rtnl_link_register(&ip6_link_ops);
2342 if (err < 0)
2343 goto rtnl_link_failed;
2344
2345 return 0;
2346
2347 rtnl_link_failed:
2348 if (ip6_tnl_mpls_supported())
2349 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2350 out_mplsip6:
2351 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2352 out_ip6ip6:
2353 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2354 out_ip4ip6:
2355 unregister_pernet_device(&ip6_tnl_net_ops);
2356 out_pernet:
2357 return err;
2358 }
2359
2360 /**
2361 * ip6_tunnel_cleanup - free resources and unregister protocol
2362 **/
2363
ip6_tunnel_cleanup(void)2364 static void __exit ip6_tunnel_cleanup(void)
2365 {
2366 rtnl_link_unregister(&ip6_link_ops);
2367 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2368 pr_info("%s: can't deregister ip4ip6\n", __func__);
2369
2370 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2371 pr_info("%s: can't deregister ip6ip6\n", __func__);
2372
2373 if (ip6_tnl_mpls_supported() &&
2374 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2375 pr_info("%s: can't deregister mplsip6\n", __func__);
2376 unregister_pernet_device(&ip6_tnl_net_ops);
2377 }
2378
2379 module_init(ip6_tunnel_init);
2380 module_exit(ip6_tunnel_cleanup);
2381