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 t = netdev_priv(dev);
261
262 dev->rtnl_link_ops = &ip6_link_ops;
263 err = register_netdevice(dev);
264 if (err < 0)
265 goto out;
266
267 strcpy(t->parms.name, dev->name);
268
269 ip6_tnl_link(ip6n, t);
270 return 0;
271
272 out:
273 return err;
274 }
275
276 /**
277 * ip6_tnl_create - create a new tunnel
278 * @net: network namespace
279 * @p: tunnel parameters
280 *
281 * Description:
282 * Create tunnel matching given parameters.
283 *
284 * Return:
285 * created tunnel or error pointer
286 **/
287
ip6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)288 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
289 {
290 struct net_device *dev;
291 struct ip6_tnl *t;
292 char name[IFNAMSIZ];
293 int err = -E2BIG;
294
295 if (p->name[0]) {
296 if (!dev_valid_name(p->name))
297 goto failed;
298 strlcpy(name, p->name, IFNAMSIZ);
299 } else {
300 sprintf(name, "ip6tnl%%d");
301 }
302 err = -ENOMEM;
303 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
304 ip6_tnl_dev_setup);
305 if (!dev)
306 goto failed;
307
308 dev_net_set(dev, net);
309
310 t = netdev_priv(dev);
311 t->parms = *p;
312 t->net = dev_net(dev);
313 err = ip6_tnl_create2(dev);
314 if (err < 0)
315 goto failed_free;
316
317 return t;
318
319 failed_free:
320 free_netdev(dev);
321 failed:
322 return ERR_PTR(err);
323 }
324
325 /**
326 * ip6_tnl_locate - find or create tunnel matching given parameters
327 * @net: network namespace
328 * @p: tunnel parameters
329 * @create: != 0 if allowed to create new tunnel if no match found
330 *
331 * Description:
332 * ip6_tnl_locate() first tries to locate an existing tunnel
333 * based on @parms. If this is unsuccessful, but @create is set a new
334 * tunnel device is created and registered for use.
335 *
336 * Return:
337 * matching tunnel or error pointer
338 **/
339
ip6_tnl_locate(struct net * net,struct __ip6_tnl_parm * p,int create)340 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
341 struct __ip6_tnl_parm *p, int create)
342 {
343 const struct in6_addr *remote = &p->raddr;
344 const struct in6_addr *local = &p->laddr;
345 struct ip6_tnl __rcu **tp;
346 struct ip6_tnl *t;
347 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
348
349 for (tp = ip6_tnl_bucket(ip6n, p);
350 (t = rtnl_dereference(*tp)) != NULL;
351 tp = &t->next) {
352 if (ipv6_addr_equal(local, &t->parms.laddr) &&
353 ipv6_addr_equal(remote, &t->parms.raddr) &&
354 p->link == t->parms.link) {
355 if (create)
356 return ERR_PTR(-EEXIST);
357
358 return t;
359 }
360 }
361 if (!create)
362 return ERR_PTR(-ENODEV);
363 return ip6_tnl_create(net, p);
364 }
365
366 /**
367 * ip6_tnl_dev_uninit - tunnel device uninitializer
368 * @dev: the device to be destroyed
369 *
370 * Description:
371 * ip6_tnl_dev_uninit() removes tunnel from its list
372 **/
373
374 static void
ip6_tnl_dev_uninit(struct net_device * dev)375 ip6_tnl_dev_uninit(struct net_device *dev)
376 {
377 struct ip6_tnl *t = netdev_priv(dev);
378 struct net *net = t->net;
379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
380
381 if (dev == ip6n->fb_tnl_dev)
382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
383 else
384 ip6_tnl_unlink(ip6n, t);
385 dst_cache_reset(&t->dst_cache);
386 dev_put(dev);
387 }
388
389 /**
390 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
391 * @skb: received socket buffer
392 * @raw: the ICMPv6 error message data
393 *
394 * Return:
395 * 0 if none was found,
396 * else index to encapsulation limit
397 **/
398
ip6_tnl_parse_tlv_enc_lim(struct sk_buff * skb,__u8 * raw)399 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
400 {
401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
402 unsigned int nhoff = raw - skb->data;
403 unsigned int off = nhoff + sizeof(*ipv6h);
404 u8 next, nexthdr = ipv6h->nexthdr;
405
406 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
407 struct ipv6_opt_hdr *hdr;
408 u16 optlen;
409
410 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
411 break;
412
413 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
414 if (nexthdr == NEXTHDR_FRAGMENT) {
415 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
416 if (frag_hdr->frag_off)
417 break;
418 optlen = 8;
419 } else if (nexthdr == NEXTHDR_AUTH) {
420 optlen = ipv6_authlen(hdr);
421 } else {
422 optlen = ipv6_optlen(hdr);
423 }
424 /* cache hdr->nexthdr, since pskb_may_pull() might
425 * invalidate hdr
426 */
427 next = hdr->nexthdr;
428 if (nexthdr == NEXTHDR_DEST) {
429 u16 i = 2;
430
431 /* Remember : hdr is no longer valid at this point. */
432 if (!pskb_may_pull(skb, off + optlen))
433 break;
434
435 while (1) {
436 struct ipv6_tlv_tnl_enc_lim *tel;
437
438 /* No more room for encapsulation limit */
439 if (i + sizeof(*tel) > optlen)
440 break;
441
442 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
443 /* return index of option if found and valid */
444 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
445 tel->length == 1)
446 return i + off - nhoff;
447 /* else jump to next option */
448 if (tel->type)
449 i += tel->length + 2;
450 else
451 i++;
452 }
453 }
454 nexthdr = next;
455 off += optlen;
456 }
457 return 0;
458 }
459 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
460
461 /* ip6_tnl_err() should handle errors in the tunnel according to the
462 * specifications in RFC 2473.
463 */
464 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)465 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
466 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
467 {
468 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
469 struct net *net = dev_net(skb->dev);
470 u8 rel_type = ICMPV6_DEST_UNREACH;
471 u8 rel_code = ICMPV6_ADDR_UNREACH;
472 __u32 rel_info = 0;
473 struct ip6_tnl *t;
474 int err = -ENOENT;
475 int rel_msg = 0;
476 u8 tproto;
477 __u16 len;
478
479 /* If the packet doesn't contain the original IPv6 header we are
480 in trouble since we might need the source address for further
481 processing of the error. */
482
483 rcu_read_lock();
484 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
485 if (!t)
486 goto out;
487
488 tproto = READ_ONCE(t->parms.proto);
489 if (tproto != ipproto && tproto != 0)
490 goto out;
491
492 err = 0;
493
494 switch (*type) {
495 case ICMPV6_DEST_UNREACH:
496 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
497 t->parms.name);
498 rel_msg = 1;
499 break;
500 case ICMPV6_TIME_EXCEED:
501 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
502 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
503 t->parms.name);
504 rel_msg = 1;
505 }
506 break;
507 case ICMPV6_PARAMPROB: {
508 struct ipv6_tlv_tnl_enc_lim *tel;
509 __u32 teli;
510
511 teli = 0;
512 if ((*code) == ICMPV6_HDR_FIELD)
513 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
514
515 if (teli && teli == *info - 2) {
516 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
517 if (tel->encap_limit == 0) {
518 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
519 t->parms.name);
520 rel_msg = 1;
521 }
522 } else {
523 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
524 t->parms.name);
525 }
526 break;
527 }
528 case ICMPV6_PKT_TOOBIG: {
529 __u32 mtu;
530
531 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
532 sock_net_uid(net, NULL));
533 mtu = *info - offset;
534 if (mtu < IPV6_MIN_MTU)
535 mtu = IPV6_MIN_MTU;
536 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
537 if (len > mtu) {
538 rel_type = ICMPV6_PKT_TOOBIG;
539 rel_code = 0;
540 rel_info = mtu;
541 rel_msg = 1;
542 }
543 break;
544 }
545 case NDISC_REDIRECT:
546 ip6_redirect(skb, net, skb->dev->ifindex, 0,
547 sock_net_uid(net, NULL));
548 break;
549 }
550
551 *type = rel_type;
552 *code = rel_code;
553 *info = rel_info;
554 *msg = rel_msg;
555
556 out:
557 rcu_read_unlock();
558 return err;
559 }
560
561 static int
ip4ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)562 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
563 u8 type, u8 code, int offset, __be32 info)
564 {
565 __u32 rel_info = ntohl(info);
566 const struct iphdr *eiph;
567 struct sk_buff *skb2;
568 int err, rel_msg = 0;
569 u8 rel_type = type;
570 u8 rel_code = code;
571 struct rtable *rt;
572 struct flowi4 fl4;
573
574 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
575 &rel_msg, &rel_info, offset);
576 if (err < 0)
577 return err;
578
579 if (rel_msg == 0)
580 return 0;
581
582 switch (rel_type) {
583 case ICMPV6_DEST_UNREACH:
584 if (rel_code != ICMPV6_ADDR_UNREACH)
585 return 0;
586 rel_type = ICMP_DEST_UNREACH;
587 rel_code = ICMP_HOST_UNREACH;
588 break;
589 case ICMPV6_PKT_TOOBIG:
590 if (rel_code != 0)
591 return 0;
592 rel_type = ICMP_DEST_UNREACH;
593 rel_code = ICMP_FRAG_NEEDED;
594 break;
595 default:
596 return 0;
597 }
598
599 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
600 return 0;
601
602 skb2 = skb_clone(skb, GFP_ATOMIC);
603 if (!skb2)
604 return 0;
605
606 skb_dst_drop(skb2);
607
608 skb_pull(skb2, offset);
609 skb_reset_network_header(skb2);
610 eiph = ip_hdr(skb2);
611
612 /* Try to guess incoming interface */
613 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
614 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
615 if (IS_ERR(rt))
616 goto out;
617
618 skb2->dev = rt->dst.dev;
619 ip_rt_put(rt);
620
621 /* route "incoming" packet */
622 if (rt->rt_flags & RTCF_LOCAL) {
623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
624 eiph->daddr, eiph->saddr, 0, 0,
625 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
626 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
627 if (!IS_ERR(rt))
628 ip_rt_put(rt);
629 goto out;
630 }
631 skb_dst_set(skb2, &rt->dst);
632 } else {
633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
634 skb2->dev) ||
635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
636 goto out;
637 }
638
639 /* change mtu on this route */
640 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
641 if (rel_info > dst_mtu(skb_dst(skb2)))
642 goto out;
643
644 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
645 }
646
647 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
648
649 out:
650 kfree_skb(skb2);
651 return 0;
652 }
653
654 static int
ip6ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)655 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
656 u8 type, u8 code, int offset, __be32 info)
657 {
658 __u32 rel_info = ntohl(info);
659 int err, rel_msg = 0;
660 u8 rel_type = type;
661 u8 rel_code = code;
662
663 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
664 &rel_msg, &rel_info, offset);
665 if (err < 0)
666 return err;
667
668 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
669 struct rt6_info *rt;
670 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
671
672 if (!skb2)
673 return 0;
674
675 skb_dst_drop(skb2);
676 skb_pull(skb2, offset);
677 skb_reset_network_header(skb2);
678
679 /* Try to guess incoming interface */
680 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
681 NULL, 0, skb2, 0);
682
683 if (rt && rt->dst.dev)
684 skb2->dev = rt->dst.dev;
685
686 icmpv6_send(skb2, rel_type, rel_code, rel_info);
687
688 ip6_rt_put(rt);
689
690 kfree_skb(skb2);
691 }
692
693 return 0;
694 }
695
696 static int
mplsip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)697 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
698 u8 type, u8 code, int offset, __be32 info)
699 {
700 __u32 rel_info = ntohl(info);
701 int err, rel_msg = 0;
702 u8 rel_type = type;
703 u8 rel_code = code;
704
705 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
706 &rel_msg, &rel_info, offset);
707 return err;
708 }
709
ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)710 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
711 const struct ipv6hdr *ipv6h,
712 struct sk_buff *skb)
713 {
714 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
715
716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
717 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
718
719 return IP6_ECN_decapsulate(ipv6h, skb);
720 }
721
ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)722 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
723 const struct ipv6hdr *ipv6h,
724 struct sk_buff *skb)
725 {
726 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
727 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
728
729 return IP6_ECN_decapsulate(ipv6h, skb);
730 }
731
mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)732 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
733 const struct ipv6hdr *ipv6h,
734 struct sk_buff *skb)
735 {
736 /* ECN is not supported in AF_MPLS */
737 return 0;
738 }
739
ip6_tnl_get_cap(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)740 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
741 const struct in6_addr *laddr,
742 const struct in6_addr *raddr)
743 {
744 struct __ip6_tnl_parm *p = &t->parms;
745 int ltype = ipv6_addr_type(laddr);
746 int rtype = ipv6_addr_type(raddr);
747 __u32 flags = 0;
748
749 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
750 flags = IP6_TNL_F_CAP_PER_PACKET;
751 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
752 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
753 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
754 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
755 if (ltype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_XMIT;
757 if (rtype&IPV6_ADDR_UNICAST)
758 flags |= IP6_TNL_F_CAP_RCV;
759 }
760 return flags;
761 }
762 EXPORT_SYMBOL(ip6_tnl_get_cap);
763
764 /* called with rcu_read_lock() */
ip6_tnl_rcv_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)765 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
766 const struct in6_addr *laddr,
767 const struct in6_addr *raddr)
768 {
769 struct __ip6_tnl_parm *p = &t->parms;
770 int ret = 0;
771 struct net *net = t->net;
772
773 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
774 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
775 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
776 struct net_device *ldev = NULL;
777
778 if (p->link)
779 ldev = dev_get_by_index_rcu(net, p->link);
780
781 if ((ipv6_addr_is_multicast(laddr) ||
782 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
783 0, IFA_F_TENTATIVE))) &&
784 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
785 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
786 0, IFA_F_TENTATIVE))))
787 ret = 1;
788 }
789 return ret;
790 }
791 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
792
__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)793 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
794 const struct tnl_ptk_info *tpi,
795 struct metadata_dst *tun_dst,
796 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
797 const struct ipv6hdr *ipv6h,
798 struct sk_buff *skb),
799 bool log_ecn_err)
800 {
801 struct pcpu_sw_netstats *tstats;
802 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
803 int err;
804
805 if ((!(tpi->flags & TUNNEL_CSUM) &&
806 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
807 ((tpi->flags & TUNNEL_CSUM) &&
808 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
809 tunnel->dev->stats.rx_crc_errors++;
810 tunnel->dev->stats.rx_errors++;
811 goto drop;
812 }
813
814 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
815 if (!(tpi->flags & TUNNEL_SEQ) ||
816 (tunnel->i_seqno &&
817 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
818 tunnel->dev->stats.rx_fifo_errors++;
819 tunnel->dev->stats.rx_errors++;
820 goto drop;
821 }
822 tunnel->i_seqno = ntohl(tpi->seq) + 1;
823 }
824
825 skb->protocol = tpi->proto;
826
827 /* Warning: All skb pointers will be invalidated! */
828 if (tunnel->dev->type == ARPHRD_ETHER) {
829 if (!pskb_may_pull(skb, ETH_HLEN)) {
830 tunnel->dev->stats.rx_length_errors++;
831 tunnel->dev->stats.rx_errors++;
832 goto drop;
833 }
834
835 ipv6h = ipv6_hdr(skb);
836 skb->protocol = eth_type_trans(skb, tunnel->dev);
837 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
838 } else {
839 skb->dev = tunnel->dev;
840 }
841
842 skb_reset_network_header(skb);
843 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
844
845 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
846
847 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
848 if (unlikely(err)) {
849 if (log_ecn_err)
850 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
851 &ipv6h->saddr,
852 ipv6_get_dsfield(ipv6h));
853 if (err > 1) {
854 ++tunnel->dev->stats.rx_frame_errors;
855 ++tunnel->dev->stats.rx_errors;
856 goto drop;
857 }
858 }
859
860 tstats = this_cpu_ptr(tunnel->dev->tstats);
861 u64_stats_update_begin(&tstats->syncp);
862 tstats->rx_packets++;
863 tstats->rx_bytes += skb->len;
864 u64_stats_update_end(&tstats->syncp);
865
866 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
867
868 if (tun_dst)
869 skb_dst_set(skb, (struct dst_entry *)tun_dst);
870
871 gro_cells_receive(&tunnel->gro_cells, skb);
872 return 0;
873
874 drop:
875 if (tun_dst)
876 dst_release((struct dst_entry *)tun_dst);
877 kfree_skb(skb);
878 return 0;
879 }
880
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)881 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
882 const struct tnl_ptk_info *tpi,
883 struct metadata_dst *tun_dst,
884 bool log_ecn_err)
885 {
886 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
887 const struct ipv6hdr *ipv6h,
888 struct sk_buff *skb);
889
890 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
891 if (tpi->proto == htons(ETH_P_IP))
892 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
893
894 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
895 log_ecn_err);
896 }
897 EXPORT_SYMBOL(ip6_tnl_rcv);
898
899 static const struct tnl_ptk_info tpi_v6 = {
900 /* no tunnel info required for ipxip6. */
901 .proto = htons(ETH_P_IPV6),
902 };
903
904 static const struct tnl_ptk_info tpi_v4 = {
905 /* no tunnel info required for ipxip6. */
906 .proto = htons(ETH_P_IP),
907 };
908
909 static const struct tnl_ptk_info tpi_mpls = {
910 /* no tunnel info required for mplsip6. */
911 .proto = htons(ETH_P_MPLS_UC),
912 };
913
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))914 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
915 const struct tnl_ptk_info *tpi,
916 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
917 const struct ipv6hdr *ipv6h,
918 struct sk_buff *skb))
919 {
920 struct ip6_tnl *t;
921 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
922 struct metadata_dst *tun_dst = NULL;
923 int ret = -1;
924
925 rcu_read_lock();
926 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
927
928 if (t) {
929 u8 tproto = READ_ONCE(t->parms.proto);
930
931 if (tproto != ipproto && tproto != 0)
932 goto drop;
933 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
934 goto drop;
935 ipv6h = ipv6_hdr(skb);
936 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
937 goto drop;
938 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
939 goto drop;
940 if (t->parms.collect_md) {
941 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
942 if (!tun_dst)
943 goto drop;
944 }
945 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
946 log_ecn_error);
947 }
948
949 rcu_read_unlock();
950
951 return ret;
952
953 drop:
954 rcu_read_unlock();
955 kfree_skb(skb);
956 return 0;
957 }
958
ip4ip6_rcv(struct sk_buff * skb)959 static int ip4ip6_rcv(struct sk_buff *skb)
960 {
961 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
962 ip4ip6_dscp_ecn_decapsulate);
963 }
964
ip6ip6_rcv(struct sk_buff * skb)965 static int ip6ip6_rcv(struct sk_buff *skb)
966 {
967 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
968 ip6ip6_dscp_ecn_decapsulate);
969 }
970
mplsip6_rcv(struct sk_buff * skb)971 static int mplsip6_rcv(struct sk_buff *skb)
972 {
973 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
974 mplsip6_dscp_ecn_decapsulate);
975 }
976
977 struct ipv6_tel_txoption {
978 struct ipv6_txoptions ops;
979 __u8 dst_opt[8];
980 };
981
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)982 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
983 {
984 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
985
986 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
987 opt->dst_opt[3] = 1;
988 opt->dst_opt[4] = encap_limit;
989 opt->dst_opt[5] = IPV6_TLV_PADN;
990 opt->dst_opt[6] = 1;
991
992 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
993 opt->ops.opt_nflen = 8;
994 }
995
996 /**
997 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
998 * @t: the outgoing tunnel device
999 * @hdr: IPv6 header from the incoming packet
1000 *
1001 * Description:
1002 * Avoid trivial tunneling loop by checking that tunnel exit-point
1003 * doesn't match source of incoming packet.
1004 *
1005 * Return:
1006 * 1 if conflict,
1007 * 0 else
1008 **/
1009
1010 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1011 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1012 {
1013 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1014 }
1015
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1016 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1017 const struct in6_addr *laddr,
1018 const struct in6_addr *raddr)
1019 {
1020 struct __ip6_tnl_parm *p = &t->parms;
1021 int ret = 0;
1022 struct net *net = t->net;
1023
1024 if (t->parms.collect_md)
1025 return 1;
1026
1027 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1028 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1029 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1030 struct net_device *ldev = NULL;
1031
1032 rcu_read_lock();
1033 if (p->link)
1034 ldev = dev_get_by_index_rcu(net, p->link);
1035
1036 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1037 0, IFA_F_TENTATIVE)))
1038 pr_warn("%s xmit: Local address not yet configured!\n",
1039 p->name);
1040 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1041 !ipv6_addr_is_multicast(raddr) &&
1042 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1043 true, 0, IFA_F_TENTATIVE)))
1044 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1045 p->name);
1046 else
1047 ret = 1;
1048 rcu_read_unlock();
1049 }
1050 return ret;
1051 }
1052 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1053
1054 /**
1055 * ip6_tnl_xmit - encapsulate packet and send
1056 * @skb: the outgoing socket buffer
1057 * @dev: the outgoing tunnel device
1058 * @dsfield: dscp code for outer header
1059 * @fl6: flow of tunneled packet
1060 * @encap_limit: encapsulation limit
1061 * @pmtu: Path MTU is stored if packet is too big
1062 * @proto: next header value
1063 *
1064 * Description:
1065 * Build new header and do some sanity checks on the packet before sending
1066 * it.
1067 *
1068 * Return:
1069 * 0 on success
1070 * -1 fail
1071 * %-EMSGSIZE message too big. return mtu in this case.
1072 **/
1073
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1074 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1075 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1076 __u8 proto)
1077 {
1078 struct ip6_tnl *t = netdev_priv(dev);
1079 struct net *net = t->net;
1080 struct net_device_stats *stats = &t->dev->stats;
1081 struct ipv6hdr *ipv6h;
1082 struct ipv6_tel_txoption opt;
1083 struct dst_entry *dst = NULL, *ndst = NULL;
1084 struct net_device *tdev;
1085 int mtu;
1086 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1087 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1088 unsigned int max_headroom = psh_hlen;
1089 bool use_cache = false;
1090 u8 hop_limit;
1091 int err = -1;
1092
1093 if (t->parms.collect_md) {
1094 hop_limit = skb_tunnel_info(skb)->key.ttl;
1095 goto route_lookup;
1096 } else {
1097 hop_limit = t->parms.hop_limit;
1098 }
1099
1100 /* NBMA tunnel */
1101 if (ipv6_addr_any(&t->parms.raddr)) {
1102 if (skb->protocol == htons(ETH_P_IPV6)) {
1103 struct in6_addr *addr6;
1104 struct neighbour *neigh;
1105 int addr_type;
1106
1107 if (!skb_dst(skb))
1108 goto tx_err_link_failure;
1109
1110 neigh = dst_neigh_lookup(skb_dst(skb),
1111 &ipv6_hdr(skb)->daddr);
1112 if (!neigh)
1113 goto tx_err_link_failure;
1114
1115 addr6 = (struct in6_addr *)&neigh->primary_key;
1116 addr_type = ipv6_addr_type(addr6);
1117
1118 if (addr_type == IPV6_ADDR_ANY)
1119 addr6 = &ipv6_hdr(skb)->daddr;
1120
1121 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1122 neigh_release(neigh);
1123 }
1124 } else if (t->parms.proto != 0 && !(t->parms.flags &
1125 (IP6_TNL_F_USE_ORIG_TCLASS |
1126 IP6_TNL_F_USE_ORIG_FWMARK))) {
1127 /* enable the cache only if neither the outer protocol nor the
1128 * routing decision depends on the current inner header value
1129 */
1130 use_cache = true;
1131 }
1132
1133 if (use_cache)
1134 dst = dst_cache_get(&t->dst_cache);
1135
1136 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1137 goto tx_err_link_failure;
1138
1139 if (!dst) {
1140 route_lookup:
1141 /* add dsfield to flowlabel for route lookup */
1142 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1143
1144 dst = ip6_route_output(net, NULL, fl6);
1145
1146 if (dst->error)
1147 goto tx_err_link_failure;
1148 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1149 if (IS_ERR(dst)) {
1150 err = PTR_ERR(dst);
1151 dst = NULL;
1152 goto tx_err_link_failure;
1153 }
1154 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1155 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1156 &fl6->daddr, 0, &fl6->saddr))
1157 goto tx_err_link_failure;
1158 ndst = dst;
1159 }
1160
1161 tdev = dst->dev;
1162
1163 if (tdev == dev) {
1164 stats->collisions++;
1165 net_warn_ratelimited("%s: Local routing loop detected!\n",
1166 t->parms.name);
1167 goto tx_err_dst_release;
1168 }
1169 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1170 if (encap_limit >= 0) {
1171 max_headroom += 8;
1172 mtu -= 8;
1173 }
1174 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1175 IPV6_MIN_MTU : IPV4_MIN_MTU);
1176
1177 skb_dst_update_pmtu_no_confirm(skb, mtu);
1178 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1179 *pmtu = mtu;
1180 err = -EMSGSIZE;
1181 goto tx_err_dst_release;
1182 }
1183
1184 if (t->err_count > 0) {
1185 if (time_before(jiffies,
1186 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1187 t->err_count--;
1188
1189 dst_link_failure(skb);
1190 } else {
1191 t->err_count = 0;
1192 }
1193 }
1194
1195 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1196
1197 /*
1198 * Okay, now see if we can stuff it in the buffer as-is.
1199 */
1200 max_headroom += LL_RESERVED_SPACE(tdev);
1201
1202 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1203 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1204 struct sk_buff *new_skb;
1205
1206 new_skb = skb_realloc_headroom(skb, max_headroom);
1207 if (!new_skb)
1208 goto tx_err_dst_release;
1209
1210 if (skb->sk)
1211 skb_set_owner_w(new_skb, skb->sk);
1212 consume_skb(skb);
1213 skb = new_skb;
1214 }
1215
1216 if (t->parms.collect_md) {
1217 if (t->encap.type != TUNNEL_ENCAP_NONE)
1218 goto tx_err_dst_release;
1219 } else {
1220 if (use_cache && ndst)
1221 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1222 }
1223 skb_dst_set(skb, dst);
1224
1225 if (hop_limit == 0) {
1226 if (skb->protocol == htons(ETH_P_IP))
1227 hop_limit = ip_hdr(skb)->ttl;
1228 else if (skb->protocol == htons(ETH_P_IPV6))
1229 hop_limit = ipv6_hdr(skb)->hop_limit;
1230 else
1231 hop_limit = ip6_dst_hoplimit(dst);
1232 }
1233
1234 /* Calculate max headroom for all the headers and adjust
1235 * needed_headroom if necessary.
1236 */
1237 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1238 + dst->header_len + t->hlen;
1239 if (max_headroom > dev->needed_headroom)
1240 dev->needed_headroom = max_headroom;
1241
1242 skb_set_inner_ipproto(skb, proto);
1243
1244 err = ip6_tnl_encap(skb, t, &proto, fl6);
1245 if (err)
1246 return err;
1247
1248 if (encap_limit >= 0) {
1249 init_tel_txopt(&opt, encap_limit);
1250 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1251 }
1252
1253 skb_push(skb, sizeof(struct ipv6hdr));
1254 skb_reset_network_header(skb);
1255 ipv6h = ipv6_hdr(skb);
1256 ip6_flow_hdr(ipv6h, dsfield,
1257 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1258 ipv6h->hop_limit = hop_limit;
1259 ipv6h->nexthdr = proto;
1260 ipv6h->saddr = fl6->saddr;
1261 ipv6h->daddr = fl6->daddr;
1262 ip6tunnel_xmit(NULL, skb, dev);
1263 return 0;
1264 tx_err_link_failure:
1265 stats->tx_carrier_errors++;
1266 dst_link_failure(skb);
1267 tx_err_dst_release:
1268 dst_release(dst);
1269 return err;
1270 }
1271 EXPORT_SYMBOL(ip6_tnl_xmit);
1272
1273 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1274 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1275 u8 protocol)
1276 {
1277 struct ip6_tnl *t = netdev_priv(dev);
1278 struct ipv6hdr *ipv6h;
1279 const struct iphdr *iph;
1280 int encap_limit = -1;
1281 __u16 offset;
1282 struct flowi6 fl6;
1283 __u8 dsfield, orig_dsfield;
1284 __u32 mtu;
1285 u8 tproto;
1286 int err;
1287
1288 tproto = READ_ONCE(t->parms.proto);
1289 if (tproto != protocol && tproto != 0)
1290 return -1;
1291
1292 if (t->parms.collect_md) {
1293 struct ip_tunnel_info *tun_info;
1294 const struct ip_tunnel_key *key;
1295
1296 tun_info = skb_tunnel_info(skb);
1297 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1298 ip_tunnel_info_af(tun_info) != AF_INET6))
1299 return -1;
1300 key = &tun_info->key;
1301 memset(&fl6, 0, sizeof(fl6));
1302 fl6.flowi6_proto = protocol;
1303 fl6.saddr = key->u.ipv6.src;
1304 fl6.daddr = key->u.ipv6.dst;
1305 fl6.flowlabel = key->label;
1306 dsfield = key->tos;
1307 switch (protocol) {
1308 case IPPROTO_IPIP:
1309 iph = ip_hdr(skb);
1310 orig_dsfield = ipv4_get_dsfield(iph);
1311 break;
1312 case IPPROTO_IPV6:
1313 ipv6h = ipv6_hdr(skb);
1314 orig_dsfield = ipv6_get_dsfield(ipv6h);
1315 break;
1316 default:
1317 orig_dsfield = dsfield;
1318 break;
1319 }
1320 } else {
1321 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1322 encap_limit = t->parms.encap_limit;
1323 if (protocol == IPPROTO_IPV6) {
1324 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1325 skb_network_header(skb));
1326 /* ip6_tnl_parse_tlv_enc_lim() might have
1327 * reallocated skb->head
1328 */
1329 if (offset > 0) {
1330 struct ipv6_tlv_tnl_enc_lim *tel;
1331
1332 tel = (void *)&skb_network_header(skb)[offset];
1333 if (tel->encap_limit == 0) {
1334 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1335 ICMPV6_HDR_FIELD, offset + 2);
1336 return -1;
1337 }
1338 encap_limit = tel->encap_limit - 1;
1339 }
1340 }
1341
1342 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1343 fl6.flowi6_proto = protocol;
1344
1345 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1346 fl6.flowi6_mark = skb->mark;
1347 else
1348 fl6.flowi6_mark = t->parms.fwmark;
1349 switch (protocol) {
1350 case IPPROTO_IPIP:
1351 iph = ip_hdr(skb);
1352 orig_dsfield = ipv4_get_dsfield(iph);
1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1354 dsfield = orig_dsfield;
1355 else
1356 dsfield = ip6_tclass(t->parms.flowinfo);
1357 break;
1358 case IPPROTO_IPV6:
1359 ipv6h = ipv6_hdr(skb);
1360 orig_dsfield = ipv6_get_dsfield(ipv6h);
1361 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1362 dsfield = orig_dsfield;
1363 else
1364 dsfield = ip6_tclass(t->parms.flowinfo);
1365 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1366 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1367 break;
1368 default:
1369 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1370 break;
1371 }
1372 }
1373
1374 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1375 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1376
1377 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1378 return -1;
1379
1380 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1381 protocol);
1382 if (err != 0) {
1383 /* XXX: send ICMP error even if DF is not set. */
1384 if (err == -EMSGSIZE)
1385 switch (protocol) {
1386 case IPPROTO_IPIP:
1387 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1388 ICMP_FRAG_NEEDED, htonl(mtu));
1389 break;
1390 case IPPROTO_IPV6:
1391 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1392 break;
1393 default:
1394 break;
1395 }
1396 return -1;
1397 }
1398
1399 return 0;
1400 }
1401
1402 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1403 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1404 {
1405 struct ip6_tnl *t = netdev_priv(dev);
1406 struct net_device_stats *stats = &t->dev->stats;
1407 u8 ipproto;
1408 int ret;
1409
1410 if (!pskb_inet_may_pull(skb))
1411 goto tx_err;
1412
1413 switch (skb->protocol) {
1414 case htons(ETH_P_IP):
1415 ipproto = IPPROTO_IPIP;
1416 break;
1417 case htons(ETH_P_IPV6):
1418 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1419 goto tx_err;
1420 ipproto = IPPROTO_IPV6;
1421 break;
1422 case htons(ETH_P_MPLS_UC):
1423 ipproto = IPPROTO_MPLS;
1424 break;
1425 default:
1426 goto tx_err;
1427 }
1428
1429 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1430 if (ret < 0)
1431 goto tx_err;
1432
1433 return NETDEV_TX_OK;
1434
1435 tx_err:
1436 stats->tx_errors++;
1437 stats->tx_dropped++;
1438 kfree_skb(skb);
1439 return NETDEV_TX_OK;
1440 }
1441
ip6_tnl_link_config(struct ip6_tnl * t)1442 static void ip6_tnl_link_config(struct ip6_tnl *t)
1443 {
1444 struct net_device *dev = t->dev;
1445 struct net_device *tdev = NULL;
1446 struct __ip6_tnl_parm *p = &t->parms;
1447 struct flowi6 *fl6 = &t->fl.u.ip6;
1448 unsigned int mtu;
1449 int t_hlen;
1450
1451 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1452 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1453
1454 /* Set up flowi template */
1455 fl6->saddr = p->laddr;
1456 fl6->daddr = p->raddr;
1457 fl6->flowi6_oif = p->link;
1458 fl6->flowlabel = 0;
1459
1460 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1461 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1462 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1463 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1464
1465 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1466 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1467
1468 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1469 dev->flags |= IFF_POINTOPOINT;
1470 else
1471 dev->flags &= ~IFF_POINTOPOINT;
1472
1473 t->tun_hlen = 0;
1474 t->hlen = t->encap_hlen + t->tun_hlen;
1475 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1476
1477 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1478 int strict = (ipv6_addr_type(&p->raddr) &
1479 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1480
1481 struct rt6_info *rt = rt6_lookup(t->net,
1482 &p->raddr, &p->laddr,
1483 p->link, NULL, strict);
1484 if (rt) {
1485 tdev = rt->dst.dev;
1486 ip6_rt_put(rt);
1487 }
1488
1489 if (!tdev && p->link)
1490 tdev = __dev_get_by_index(t->net, p->link);
1491
1492 if (tdev) {
1493 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1494 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1495
1496 dev->mtu = mtu - t_hlen;
1497 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1498 dev->mtu -= 8;
1499
1500 if (dev->mtu < IPV6_MIN_MTU)
1501 dev->mtu = IPV6_MIN_MTU;
1502 }
1503 }
1504 }
1505
1506 /**
1507 * ip6_tnl_change - update the tunnel parameters
1508 * @t: tunnel to be changed
1509 * @p: tunnel configuration parameters
1510 *
1511 * Description:
1512 * ip6_tnl_change() updates the tunnel parameters
1513 **/
1514
1515 static int
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1516 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1517 {
1518 t->parms.laddr = p->laddr;
1519 t->parms.raddr = p->raddr;
1520 t->parms.flags = p->flags;
1521 t->parms.hop_limit = p->hop_limit;
1522 t->parms.encap_limit = p->encap_limit;
1523 t->parms.flowinfo = p->flowinfo;
1524 t->parms.link = p->link;
1525 t->parms.proto = p->proto;
1526 t->parms.fwmark = p->fwmark;
1527 dst_cache_reset(&t->dst_cache);
1528 ip6_tnl_link_config(t);
1529 return 0;
1530 }
1531
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1532 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1533 {
1534 struct net *net = t->net;
1535 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1536 int err;
1537
1538 ip6_tnl_unlink(ip6n, t);
1539 synchronize_net();
1540 err = ip6_tnl_change(t, p);
1541 ip6_tnl_link(ip6n, t);
1542 netdev_state_change(t->dev);
1543 return err;
1544 }
1545
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1546 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1547 {
1548 /* for default tnl0 device allow to change only the proto */
1549 t->parms.proto = p->proto;
1550 netdev_state_change(t->dev);
1551 return 0;
1552 }
1553
1554 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1555 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1556 {
1557 p->laddr = u->laddr;
1558 p->raddr = u->raddr;
1559 p->flags = u->flags;
1560 p->hop_limit = u->hop_limit;
1561 p->encap_limit = u->encap_limit;
1562 p->flowinfo = u->flowinfo;
1563 p->link = u->link;
1564 p->proto = u->proto;
1565 memcpy(p->name, u->name, sizeof(u->name));
1566 }
1567
1568 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1569 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1570 {
1571 u->laddr = p->laddr;
1572 u->raddr = p->raddr;
1573 u->flags = p->flags;
1574 u->hop_limit = p->hop_limit;
1575 u->encap_limit = p->encap_limit;
1576 u->flowinfo = p->flowinfo;
1577 u->link = p->link;
1578 u->proto = p->proto;
1579 memcpy(u->name, p->name, sizeof(u->name));
1580 }
1581
1582 /**
1583 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1584 * @dev: virtual device associated with tunnel
1585 * @ifr: parameters passed from userspace
1586 * @cmd: command to be performed
1587 *
1588 * Description:
1589 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1590 * from userspace.
1591 *
1592 * The possible commands are the following:
1593 * %SIOCGETTUNNEL: get tunnel parameters for device
1594 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1595 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1596 * %SIOCDELTUNNEL: delete tunnel
1597 *
1598 * The fallback device "ip6tnl0", created during module
1599 * initialization, can be used for creating other tunnel devices.
1600 *
1601 * Return:
1602 * 0 on success,
1603 * %-EFAULT if unable to copy data to or from userspace,
1604 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1605 * %-EINVAL if passed tunnel parameters are invalid,
1606 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1607 * %-ENODEV if attempting to change or delete a nonexisting device
1608 **/
1609
1610 static int
ip6_tnl_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1611 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1612 {
1613 int err = 0;
1614 struct ip6_tnl_parm p;
1615 struct __ip6_tnl_parm p1;
1616 struct ip6_tnl *t = netdev_priv(dev);
1617 struct net *net = t->net;
1618 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1619
1620 memset(&p1, 0, sizeof(p1));
1621
1622 switch (cmd) {
1623 case SIOCGETTUNNEL:
1624 if (dev == ip6n->fb_tnl_dev) {
1625 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1626 err = -EFAULT;
1627 break;
1628 }
1629 ip6_tnl_parm_from_user(&p1, &p);
1630 t = ip6_tnl_locate(net, &p1, 0);
1631 if (IS_ERR(t))
1632 t = netdev_priv(dev);
1633 } else {
1634 memset(&p, 0, sizeof(p));
1635 }
1636 ip6_tnl_parm_to_user(&p, &t->parms);
1637 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1638 err = -EFAULT;
1639 }
1640 break;
1641 case SIOCADDTUNNEL:
1642 case SIOCCHGTUNNEL:
1643 err = -EPERM;
1644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1645 break;
1646 err = -EFAULT;
1647 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1648 break;
1649 err = -EINVAL;
1650 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1651 p.proto != 0)
1652 break;
1653 ip6_tnl_parm_from_user(&p1, &p);
1654 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1655 if (cmd == SIOCCHGTUNNEL) {
1656 if (!IS_ERR(t)) {
1657 if (t->dev != dev) {
1658 err = -EEXIST;
1659 break;
1660 }
1661 } else
1662 t = netdev_priv(dev);
1663 if (dev == ip6n->fb_tnl_dev)
1664 err = ip6_tnl0_update(t, &p1);
1665 else
1666 err = ip6_tnl_update(t, &p1);
1667 }
1668 if (!IS_ERR(t)) {
1669 err = 0;
1670 ip6_tnl_parm_to_user(&p, &t->parms);
1671 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1672 err = -EFAULT;
1673
1674 } else {
1675 err = PTR_ERR(t);
1676 }
1677 break;
1678 case SIOCDELTUNNEL:
1679 err = -EPERM;
1680 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1681 break;
1682
1683 if (dev == ip6n->fb_tnl_dev) {
1684 err = -EFAULT;
1685 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1686 break;
1687 err = -ENOENT;
1688 ip6_tnl_parm_from_user(&p1, &p);
1689 t = ip6_tnl_locate(net, &p1, 0);
1690 if (IS_ERR(t))
1691 break;
1692 err = -EPERM;
1693 if (t->dev == ip6n->fb_tnl_dev)
1694 break;
1695 dev = t->dev;
1696 }
1697 err = 0;
1698 unregister_netdevice(dev);
1699 break;
1700 default:
1701 err = -EINVAL;
1702 }
1703 return err;
1704 }
1705
1706 /**
1707 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1708 * @dev: virtual device associated with tunnel
1709 * @new_mtu: the new mtu
1710 *
1711 * Return:
1712 * 0 on success,
1713 * %-EINVAL if mtu too small
1714 **/
1715
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1716 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1717 {
1718 struct ip6_tnl *tnl = netdev_priv(dev);
1719
1720 if (tnl->parms.proto == IPPROTO_IPV6) {
1721 if (new_mtu < IPV6_MIN_MTU)
1722 return -EINVAL;
1723 } else {
1724 if (new_mtu < ETH_MIN_MTU)
1725 return -EINVAL;
1726 }
1727 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1728 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1729 return -EINVAL;
1730 } else {
1731 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1732 return -EINVAL;
1733 }
1734 dev->mtu = new_mtu;
1735 return 0;
1736 }
1737 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1738
ip6_tnl_get_iflink(const struct net_device * dev)1739 int ip6_tnl_get_iflink(const struct net_device *dev)
1740 {
1741 struct ip6_tnl *t = netdev_priv(dev);
1742
1743 return t->parms.link;
1744 }
1745 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1746
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1747 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1748 unsigned int num)
1749 {
1750 if (num >= MAX_IPTUN_ENCAP_OPS)
1751 return -ERANGE;
1752
1753 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1754 &ip6tun_encaps[num],
1755 NULL, ops) ? 0 : -1;
1756 }
1757 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1758
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1759 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1760 unsigned int num)
1761 {
1762 int ret;
1763
1764 if (num >= MAX_IPTUN_ENCAP_OPS)
1765 return -ERANGE;
1766
1767 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1768 &ip6tun_encaps[num],
1769 ops, NULL) == ops) ? 0 : -1;
1770
1771 synchronize_net();
1772
1773 return ret;
1774 }
1775 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1776
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1777 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1778 struct ip_tunnel_encap *ipencap)
1779 {
1780 int hlen;
1781
1782 memset(&t->encap, 0, sizeof(t->encap));
1783
1784 hlen = ip6_encap_hlen(ipencap);
1785 if (hlen < 0)
1786 return hlen;
1787
1788 t->encap.type = ipencap->type;
1789 t->encap.sport = ipencap->sport;
1790 t->encap.dport = ipencap->dport;
1791 t->encap.flags = ipencap->flags;
1792
1793 t->encap_hlen = hlen;
1794 t->hlen = t->encap_hlen + t->tun_hlen;
1795
1796 return 0;
1797 }
1798 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1799
1800 static const struct net_device_ops ip6_tnl_netdev_ops = {
1801 .ndo_init = ip6_tnl_dev_init,
1802 .ndo_uninit = ip6_tnl_dev_uninit,
1803 .ndo_start_xmit = ip6_tnl_start_xmit,
1804 .ndo_do_ioctl = ip6_tnl_ioctl,
1805 .ndo_change_mtu = ip6_tnl_change_mtu,
1806 .ndo_get_stats64 = dev_get_tstats64,
1807 .ndo_get_iflink = ip6_tnl_get_iflink,
1808 };
1809
1810 #define IPXIPX_FEATURES (NETIF_F_SG | \
1811 NETIF_F_FRAGLIST | \
1812 NETIF_F_HIGHDMA | \
1813 NETIF_F_GSO_SOFTWARE | \
1814 NETIF_F_HW_CSUM)
1815
1816 /**
1817 * ip6_tnl_dev_setup - setup virtual tunnel device
1818 * @dev: virtual device associated with tunnel
1819 *
1820 * Description:
1821 * Initialize function pointers and device parameters
1822 **/
1823
ip6_tnl_dev_setup(struct net_device * dev)1824 static void ip6_tnl_dev_setup(struct net_device *dev)
1825 {
1826 dev->netdev_ops = &ip6_tnl_netdev_ops;
1827 dev->header_ops = &ip_tunnel_header_ops;
1828 dev->needs_free_netdev = true;
1829 dev->priv_destructor = ip6_dev_free;
1830
1831 dev->type = ARPHRD_TUNNEL6;
1832 dev->flags |= IFF_NOARP;
1833 dev->addr_len = sizeof(struct in6_addr);
1834 dev->features |= NETIF_F_LLTX;
1835 netif_keep_dst(dev);
1836
1837 dev->features |= IPXIPX_FEATURES;
1838 dev->hw_features |= IPXIPX_FEATURES;
1839
1840 /* This perm addr will be used as interface identifier by IPv6 */
1841 dev->addr_assign_type = NET_ADDR_RANDOM;
1842 eth_random_addr(dev->perm_addr);
1843 }
1844
1845
1846 /**
1847 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1848 * @dev: virtual device associated with tunnel
1849 **/
1850
1851 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1852 ip6_tnl_dev_init_gen(struct net_device *dev)
1853 {
1854 struct ip6_tnl *t = netdev_priv(dev);
1855 int ret;
1856 int t_hlen;
1857
1858 t->dev = dev;
1859 t->net = dev_net(dev);
1860 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1861 if (!dev->tstats)
1862 return -ENOMEM;
1863
1864 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1865 if (ret)
1866 goto free_stats;
1867
1868 ret = gro_cells_init(&t->gro_cells, dev);
1869 if (ret)
1870 goto destroy_dst;
1871
1872 t->tun_hlen = 0;
1873 t->hlen = t->encap_hlen + t->tun_hlen;
1874 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1875
1876 dev->type = ARPHRD_TUNNEL6;
1877 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1878 dev->mtu = ETH_DATA_LEN - t_hlen;
1879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1880 dev->mtu -= 8;
1881 dev->min_mtu = ETH_MIN_MTU;
1882 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1883
1884 dev_hold(dev);
1885 return 0;
1886
1887 destroy_dst:
1888 dst_cache_destroy(&t->dst_cache);
1889 free_stats:
1890 free_percpu(dev->tstats);
1891 dev->tstats = NULL;
1892
1893 return ret;
1894 }
1895
1896 /**
1897 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1898 * @dev: virtual device associated with tunnel
1899 **/
1900
ip6_tnl_dev_init(struct net_device * dev)1901 static int ip6_tnl_dev_init(struct net_device *dev)
1902 {
1903 struct ip6_tnl *t = netdev_priv(dev);
1904 int err = ip6_tnl_dev_init_gen(dev);
1905
1906 if (err)
1907 return err;
1908 ip6_tnl_link_config(t);
1909 if (t->parms.collect_md)
1910 netif_keep_dst(dev);
1911 return 0;
1912 }
1913
1914 /**
1915 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1916 * @dev: fallback device
1917 *
1918 * Return: 0
1919 **/
1920
ip6_fb_tnl_dev_init(struct net_device * dev)1921 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1922 {
1923 struct ip6_tnl *t = netdev_priv(dev);
1924 struct net *net = dev_net(dev);
1925 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1926
1927 t->parms.proto = IPPROTO_IPV6;
1928
1929 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1930 return 0;
1931 }
1932
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1933 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1934 struct netlink_ext_ack *extack)
1935 {
1936 u8 proto;
1937
1938 if (!data || !data[IFLA_IPTUN_PROTO])
1939 return 0;
1940
1941 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1942 if (proto != IPPROTO_IPV6 &&
1943 proto != IPPROTO_IPIP &&
1944 proto != 0)
1945 return -EINVAL;
1946
1947 return 0;
1948 }
1949
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1950 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1951 struct __ip6_tnl_parm *parms)
1952 {
1953 memset(parms, 0, sizeof(*parms));
1954
1955 if (!data)
1956 return;
1957
1958 if (data[IFLA_IPTUN_LINK])
1959 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1960
1961 if (data[IFLA_IPTUN_LOCAL])
1962 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1963
1964 if (data[IFLA_IPTUN_REMOTE])
1965 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1966
1967 if (data[IFLA_IPTUN_TTL])
1968 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1969
1970 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1971 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1972
1973 if (data[IFLA_IPTUN_FLOWINFO])
1974 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1975
1976 if (data[IFLA_IPTUN_FLAGS])
1977 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1978
1979 if (data[IFLA_IPTUN_PROTO])
1980 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1981
1982 if (data[IFLA_IPTUN_COLLECT_METADATA])
1983 parms->collect_md = true;
1984
1985 if (data[IFLA_IPTUN_FWMARK])
1986 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1987 }
1988
ip6_tnl_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1989 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1990 struct ip_tunnel_encap *ipencap)
1991 {
1992 bool ret = false;
1993
1994 memset(ipencap, 0, sizeof(*ipencap));
1995
1996 if (!data)
1997 return ret;
1998
1999 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2000 ret = true;
2001 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2002 }
2003
2004 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2005 ret = true;
2006 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2007 }
2008
2009 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2010 ret = true;
2011 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2012 }
2013
2014 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2015 ret = true;
2016 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2017 }
2018
2019 return ret;
2020 }
2021
ip6_tnl_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2022 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2023 struct nlattr *tb[], struct nlattr *data[],
2024 struct netlink_ext_ack *extack)
2025 {
2026 struct net *net = dev_net(dev);
2027 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2028 struct ip_tunnel_encap ipencap;
2029 struct ip6_tnl *nt, *t;
2030 int err;
2031
2032 nt = netdev_priv(dev);
2033
2034 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2035 err = ip6_tnl_encap_setup(nt, &ipencap);
2036 if (err < 0)
2037 return err;
2038 }
2039
2040 ip6_tnl_netlink_parms(data, &nt->parms);
2041
2042 if (nt->parms.collect_md) {
2043 if (rtnl_dereference(ip6n->collect_md_tun))
2044 return -EEXIST;
2045 } else {
2046 t = ip6_tnl_locate(net, &nt->parms, 0);
2047 if (!IS_ERR(t))
2048 return -EEXIST;
2049 }
2050
2051 err = ip6_tnl_create2(dev);
2052 if (!err && tb[IFLA_MTU])
2053 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2054
2055 return err;
2056 }
2057
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2058 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2059 struct nlattr *data[],
2060 struct netlink_ext_ack *extack)
2061 {
2062 struct ip6_tnl *t = netdev_priv(dev);
2063 struct __ip6_tnl_parm p;
2064 struct net *net = t->net;
2065 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2066 struct ip_tunnel_encap ipencap;
2067
2068 if (dev == ip6n->fb_tnl_dev)
2069 return -EINVAL;
2070
2071 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2072 int err = ip6_tnl_encap_setup(t, &ipencap);
2073
2074 if (err < 0)
2075 return err;
2076 }
2077 ip6_tnl_netlink_parms(data, &p);
2078 if (p.collect_md)
2079 return -EINVAL;
2080
2081 t = ip6_tnl_locate(net, &p, 0);
2082 if (!IS_ERR(t)) {
2083 if (t->dev != dev)
2084 return -EEXIST;
2085 } else
2086 t = netdev_priv(dev);
2087
2088 return ip6_tnl_update(t, &p);
2089 }
2090
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2091 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2092 {
2093 struct net *net = dev_net(dev);
2094 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2095
2096 if (dev != ip6n->fb_tnl_dev)
2097 unregister_netdevice_queue(dev, head);
2098 }
2099
ip6_tnl_get_size(const struct net_device * dev)2100 static size_t ip6_tnl_get_size(const struct net_device *dev)
2101 {
2102 return
2103 /* IFLA_IPTUN_LINK */
2104 nla_total_size(4) +
2105 /* IFLA_IPTUN_LOCAL */
2106 nla_total_size(sizeof(struct in6_addr)) +
2107 /* IFLA_IPTUN_REMOTE */
2108 nla_total_size(sizeof(struct in6_addr)) +
2109 /* IFLA_IPTUN_TTL */
2110 nla_total_size(1) +
2111 /* IFLA_IPTUN_ENCAP_LIMIT */
2112 nla_total_size(1) +
2113 /* IFLA_IPTUN_FLOWINFO */
2114 nla_total_size(4) +
2115 /* IFLA_IPTUN_FLAGS */
2116 nla_total_size(4) +
2117 /* IFLA_IPTUN_PROTO */
2118 nla_total_size(1) +
2119 /* IFLA_IPTUN_ENCAP_TYPE */
2120 nla_total_size(2) +
2121 /* IFLA_IPTUN_ENCAP_FLAGS */
2122 nla_total_size(2) +
2123 /* IFLA_IPTUN_ENCAP_SPORT */
2124 nla_total_size(2) +
2125 /* IFLA_IPTUN_ENCAP_DPORT */
2126 nla_total_size(2) +
2127 /* IFLA_IPTUN_COLLECT_METADATA */
2128 nla_total_size(0) +
2129 /* IFLA_IPTUN_FWMARK */
2130 nla_total_size(4) +
2131 0;
2132 }
2133
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2134 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2135 {
2136 struct ip6_tnl *tunnel = netdev_priv(dev);
2137 struct __ip6_tnl_parm *parm = &tunnel->parms;
2138
2139 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2140 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2141 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2142 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2143 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2144 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2145 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2146 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2147 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2148 goto nla_put_failure;
2149
2150 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2151 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2152 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2153 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2154 goto nla_put_failure;
2155
2156 if (parm->collect_md)
2157 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2158 goto nla_put_failure;
2159
2160 return 0;
2161
2162 nla_put_failure:
2163 return -EMSGSIZE;
2164 }
2165
ip6_tnl_get_link_net(const struct net_device * dev)2166 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2167 {
2168 struct ip6_tnl *tunnel = netdev_priv(dev);
2169
2170 return tunnel->net;
2171 }
2172 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2173
2174 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2175 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2176 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2177 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2178 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2179 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2180 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2181 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2182 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2183 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2184 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2185 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2186 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2187 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2188 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2189 };
2190
2191 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2192 .kind = "ip6tnl",
2193 .maxtype = IFLA_IPTUN_MAX,
2194 .policy = ip6_tnl_policy,
2195 .priv_size = sizeof(struct ip6_tnl),
2196 .setup = ip6_tnl_dev_setup,
2197 .validate = ip6_tnl_validate,
2198 .newlink = ip6_tnl_newlink,
2199 .changelink = ip6_tnl_changelink,
2200 .dellink = ip6_tnl_dellink,
2201 .get_size = ip6_tnl_get_size,
2202 .fill_info = ip6_tnl_fill_info,
2203 .get_link_net = ip6_tnl_get_link_net,
2204 };
2205
2206 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2207 .handler = ip4ip6_rcv,
2208 .err_handler = ip4ip6_err,
2209 .priority = 1,
2210 };
2211
2212 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2213 .handler = ip6ip6_rcv,
2214 .err_handler = ip6ip6_err,
2215 .priority = 1,
2216 };
2217
2218 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2219 .handler = mplsip6_rcv,
2220 .err_handler = mplsip6_err,
2221 .priority = 1,
2222 };
2223
ip6_tnl_destroy_tunnels(struct net * net,struct list_head * list)2224 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2225 {
2226 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2227 struct net_device *dev, *aux;
2228 int h;
2229 struct ip6_tnl *t;
2230
2231 for_each_netdev_safe(net, dev, aux)
2232 if (dev->rtnl_link_ops == &ip6_link_ops)
2233 unregister_netdevice_queue(dev, list);
2234
2235 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2236 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2237 while (t) {
2238 /* If dev is in the same netns, it has already
2239 * been added to the list by the previous loop.
2240 */
2241 if (!net_eq(dev_net(t->dev), net))
2242 unregister_netdevice_queue(t->dev, list);
2243 t = rtnl_dereference(t->next);
2244 }
2245 }
2246
2247 t = rtnl_dereference(ip6n->tnls_wc[0]);
2248 while (t) {
2249 /* If dev is in the same netns, it has already
2250 * been added to the list by the previous loop.
2251 */
2252 if (!net_eq(dev_net(t->dev), net))
2253 unregister_netdevice_queue(t->dev, list);
2254 t = rtnl_dereference(t->next);
2255 }
2256 }
2257
ip6_tnl_init_net(struct net * net)2258 static int __net_init ip6_tnl_init_net(struct net *net)
2259 {
2260 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2261 struct ip6_tnl *t = NULL;
2262 int err;
2263
2264 ip6n->tnls[0] = ip6n->tnls_wc;
2265 ip6n->tnls[1] = ip6n->tnls_r_l;
2266
2267 if (!net_has_fallback_tunnels(net))
2268 return 0;
2269 err = -ENOMEM;
2270 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2271 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2272
2273 if (!ip6n->fb_tnl_dev)
2274 goto err_alloc_dev;
2275 dev_net_set(ip6n->fb_tnl_dev, net);
2276 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2277 /* FB netdevice is special: we have one, and only one per netns.
2278 * Allowing to move it to another netns is clearly unsafe.
2279 */
2280 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2281
2282 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2283 if (err < 0)
2284 goto err_register;
2285
2286 err = register_netdev(ip6n->fb_tnl_dev);
2287 if (err < 0)
2288 goto err_register;
2289
2290 t = netdev_priv(ip6n->fb_tnl_dev);
2291
2292 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2293 return 0;
2294
2295 err_register:
2296 free_netdev(ip6n->fb_tnl_dev);
2297 err_alloc_dev:
2298 return err;
2299 }
2300
ip6_tnl_exit_batch_net(struct list_head * net_list)2301 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2302 {
2303 struct net *net;
2304 LIST_HEAD(list);
2305
2306 rtnl_lock();
2307 list_for_each_entry(net, net_list, exit_list)
2308 ip6_tnl_destroy_tunnels(net, &list);
2309 unregister_netdevice_many(&list);
2310 rtnl_unlock();
2311 }
2312
2313 static struct pernet_operations ip6_tnl_net_ops = {
2314 .init = ip6_tnl_init_net,
2315 .exit_batch = ip6_tnl_exit_batch_net,
2316 .id = &ip6_tnl_net_id,
2317 .size = sizeof(struct ip6_tnl_net),
2318 };
2319
2320 /**
2321 * ip6_tunnel_init - register protocol and reserve needed resources
2322 *
2323 * Return: 0 on success
2324 **/
2325
ip6_tunnel_init(void)2326 static int __init ip6_tunnel_init(void)
2327 {
2328 int err;
2329
2330 if (!ipv6_mod_enabled())
2331 return -EOPNOTSUPP;
2332
2333 err = register_pernet_device(&ip6_tnl_net_ops);
2334 if (err < 0)
2335 goto out_pernet;
2336
2337 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2338 if (err < 0) {
2339 pr_err("%s: can't register ip4ip6\n", __func__);
2340 goto out_ip4ip6;
2341 }
2342
2343 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2344 if (err < 0) {
2345 pr_err("%s: can't register ip6ip6\n", __func__);
2346 goto out_ip6ip6;
2347 }
2348
2349 if (ip6_tnl_mpls_supported()) {
2350 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2351 if (err < 0) {
2352 pr_err("%s: can't register mplsip6\n", __func__);
2353 goto out_mplsip6;
2354 }
2355 }
2356
2357 err = rtnl_link_register(&ip6_link_ops);
2358 if (err < 0)
2359 goto rtnl_link_failed;
2360
2361 return 0;
2362
2363 rtnl_link_failed:
2364 if (ip6_tnl_mpls_supported())
2365 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2366 out_mplsip6:
2367 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2368 out_ip6ip6:
2369 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2370 out_ip4ip6:
2371 unregister_pernet_device(&ip6_tnl_net_ops);
2372 out_pernet:
2373 return err;
2374 }
2375
2376 /**
2377 * ip6_tunnel_cleanup - free resources and unregister protocol
2378 **/
2379
ip6_tunnel_cleanup(void)2380 static void __exit ip6_tunnel_cleanup(void)
2381 {
2382 rtnl_link_unregister(&ip6_link_ops);
2383 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2384 pr_info("%s: can't deregister ip4ip6\n", __func__);
2385
2386 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2387 pr_info("%s: can't deregister ip6ip6\n", __func__);
2388
2389 if (ip6_tnl_mpls_supported() &&
2390 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2391 pr_info("%s: can't deregister mplsip6\n", __func__);
2392 unregister_pernet_device(&ip6_tnl_net_ops);
2393 }
2394
2395 module_init(ip6_tunnel_init);
2396 module_exit(ip6_tunnel_cleanup);
2397