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 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 optlen = 8;
416 } else if (nexthdr == NEXTHDR_AUTH) {
417 optlen = ipv6_authlen(hdr);
418 } else {
419 optlen = ipv6_optlen(hdr);
420 }
421
422 if (!pskb_may_pull(skb, off + optlen))
423 break;
424
425 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
426 if (nexthdr == NEXTHDR_FRAGMENT) {
427 struct frag_hdr *frag_hdr = (struct frag_hdr *)hdr;
428
429 if (frag_hdr->frag_off)
430 break;
431 }
432 if (nexthdr == NEXTHDR_DEST) {
433 u16 i = 2;
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 = hdr->nexthdr;
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 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
802 int err;
803
804 if ((!(tpi->flags & TUNNEL_CSUM) &&
805 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
806 ((tpi->flags & TUNNEL_CSUM) &&
807 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
808 tunnel->dev->stats.rx_crc_errors++;
809 tunnel->dev->stats.rx_errors++;
810 goto drop;
811 }
812
813 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
814 if (!(tpi->flags & TUNNEL_SEQ) ||
815 (tunnel->i_seqno &&
816 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
817 tunnel->dev->stats.rx_fifo_errors++;
818 tunnel->dev->stats.rx_errors++;
819 goto drop;
820 }
821 tunnel->i_seqno = ntohl(tpi->seq) + 1;
822 }
823
824 skb->protocol = tpi->proto;
825
826 /* Warning: All skb pointers will be invalidated! */
827 if (tunnel->dev->type == ARPHRD_ETHER) {
828 if (!pskb_may_pull(skb, ETH_HLEN)) {
829 tunnel->dev->stats.rx_length_errors++;
830 tunnel->dev->stats.rx_errors++;
831 goto drop;
832 }
833
834 ipv6h = ipv6_hdr(skb);
835 skb->protocol = eth_type_trans(skb, tunnel->dev);
836 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
837 } else {
838 skb->dev = tunnel->dev;
839 skb_reset_mac_header(skb);
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 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
861
862 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
863
864 if (tun_dst)
865 skb_dst_set(skb, (struct dst_entry *)tun_dst);
866
867 gro_cells_receive(&tunnel->gro_cells, skb);
868 return 0;
869
870 drop:
871 if (tun_dst)
872 dst_release((struct dst_entry *)tun_dst);
873 kfree_skb(skb);
874 return 0;
875 }
876
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)877 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
878 const struct tnl_ptk_info *tpi,
879 struct metadata_dst *tun_dst,
880 bool log_ecn_err)
881 {
882 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
883 const struct ipv6hdr *ipv6h,
884 struct sk_buff *skb);
885
886 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
887 if (tpi->proto == htons(ETH_P_IP))
888 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
889
890 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
891 log_ecn_err);
892 }
893 EXPORT_SYMBOL(ip6_tnl_rcv);
894
895 static const struct tnl_ptk_info tpi_v6 = {
896 /* no tunnel info required for ipxip6. */
897 .proto = htons(ETH_P_IPV6),
898 };
899
900 static const struct tnl_ptk_info tpi_v4 = {
901 /* no tunnel info required for ipxip6. */
902 .proto = htons(ETH_P_IP),
903 };
904
905 static const struct tnl_ptk_info tpi_mpls = {
906 /* no tunnel info required for mplsip6. */
907 .proto = htons(ETH_P_MPLS_UC),
908 };
909
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))910 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
911 const struct tnl_ptk_info *tpi,
912 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
913 const struct ipv6hdr *ipv6h,
914 struct sk_buff *skb))
915 {
916 struct ip6_tnl *t;
917 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
918 struct metadata_dst *tun_dst = NULL;
919 int ret = -1;
920
921 rcu_read_lock();
922 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
923
924 if (t) {
925 u8 tproto = READ_ONCE(t->parms.proto);
926
927 if (tproto != ipproto && tproto != 0)
928 goto drop;
929 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
930 goto drop;
931 ipv6h = ipv6_hdr(skb);
932 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
933 goto drop;
934 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
935 goto drop;
936 if (t->parms.collect_md) {
937 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
938 if (!tun_dst)
939 goto drop;
940 }
941 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
942 log_ecn_error);
943 }
944
945 rcu_read_unlock();
946
947 return ret;
948
949 drop:
950 rcu_read_unlock();
951 kfree_skb(skb);
952 return 0;
953 }
954
ip4ip6_rcv(struct sk_buff * skb)955 static int ip4ip6_rcv(struct sk_buff *skb)
956 {
957 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
958 ip4ip6_dscp_ecn_decapsulate);
959 }
960
ip6ip6_rcv(struct sk_buff * skb)961 static int ip6ip6_rcv(struct sk_buff *skb)
962 {
963 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
964 ip6ip6_dscp_ecn_decapsulate);
965 }
966
mplsip6_rcv(struct sk_buff * skb)967 static int mplsip6_rcv(struct sk_buff *skb)
968 {
969 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
970 mplsip6_dscp_ecn_decapsulate);
971 }
972
973 struct ipv6_tel_txoption {
974 struct ipv6_txoptions ops;
975 __u8 dst_opt[8];
976 };
977
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)978 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
979 {
980 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
981
982 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
983 opt->dst_opt[3] = 1;
984 opt->dst_opt[4] = encap_limit;
985 opt->dst_opt[5] = IPV6_TLV_PADN;
986 opt->dst_opt[6] = 1;
987
988 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
989 opt->ops.opt_nflen = 8;
990 }
991
992 /**
993 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
994 * @t: the outgoing tunnel device
995 * @hdr: IPv6 header from the incoming packet
996 *
997 * Description:
998 * Avoid trivial tunneling loop by checking that tunnel exit-point
999 * doesn't match source of incoming packet.
1000 *
1001 * Return:
1002 * 1 if conflict,
1003 * 0 else
1004 **/
1005
1006 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1007 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1008 {
1009 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1010 }
1011
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1012 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1013 const struct in6_addr *laddr,
1014 const struct in6_addr *raddr)
1015 {
1016 struct __ip6_tnl_parm *p = &t->parms;
1017 int ret = 0;
1018 struct net *net = t->net;
1019
1020 if (t->parms.collect_md)
1021 return 1;
1022
1023 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1024 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1025 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1026 struct net_device *ldev = NULL;
1027
1028 rcu_read_lock();
1029 if (p->link)
1030 ldev = dev_get_by_index_rcu(net, p->link);
1031
1032 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1033 0, IFA_F_TENTATIVE)))
1034 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1035 p->name);
1036 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1037 !ipv6_addr_is_multicast(raddr) &&
1038 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1039 true, 0, IFA_F_TENTATIVE)))
1040 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1041 p->name);
1042 else
1043 ret = 1;
1044 rcu_read_unlock();
1045 }
1046 return ret;
1047 }
1048 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1049
1050 /**
1051 * ip6_tnl_xmit - encapsulate packet and send
1052 * @skb: the outgoing socket buffer
1053 * @dev: the outgoing tunnel device
1054 * @dsfield: dscp code for outer header
1055 * @fl6: flow of tunneled packet
1056 * @encap_limit: encapsulation limit
1057 * @pmtu: Path MTU is stored if packet is too big
1058 * @proto: next header value
1059 *
1060 * Description:
1061 * Build new header and do some sanity checks on the packet before sending
1062 * it.
1063 *
1064 * Return:
1065 * 0 on success
1066 * -1 fail
1067 * %-EMSGSIZE message too big. return mtu in this case.
1068 **/
1069
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1070 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1071 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1072 __u8 proto)
1073 {
1074 struct ip6_tnl *t = netdev_priv(dev);
1075 struct net *net = t->net;
1076 struct net_device_stats *stats = &t->dev->stats;
1077 struct ipv6hdr *ipv6h;
1078 struct ipv6_tel_txoption opt;
1079 struct dst_entry *dst = NULL, *ndst = NULL;
1080 struct net_device *tdev;
1081 int mtu;
1082 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1083 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1084 unsigned int max_headroom = psh_hlen;
1085 bool use_cache = false;
1086 u8 hop_limit;
1087 int err = -1;
1088
1089 if (t->parms.collect_md) {
1090 hop_limit = skb_tunnel_info(skb)->key.ttl;
1091 goto route_lookup;
1092 } else {
1093 hop_limit = t->parms.hop_limit;
1094 }
1095
1096 /* NBMA tunnel */
1097 if (ipv6_addr_any(&t->parms.raddr)) {
1098 if (skb->protocol == htons(ETH_P_IPV6)) {
1099 struct in6_addr *addr6;
1100 struct neighbour *neigh;
1101 int addr_type;
1102
1103 if (!skb_dst(skb))
1104 goto tx_err_link_failure;
1105
1106 neigh = dst_neigh_lookup(skb_dst(skb),
1107 &ipv6_hdr(skb)->daddr);
1108 if (!neigh)
1109 goto tx_err_link_failure;
1110
1111 addr6 = (struct in6_addr *)&neigh->primary_key;
1112 addr_type = ipv6_addr_type(addr6);
1113
1114 if (addr_type == IPV6_ADDR_ANY)
1115 addr6 = &ipv6_hdr(skb)->daddr;
1116
1117 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1118 neigh_release(neigh);
1119 }
1120 } else if (t->parms.proto != 0 && !(t->parms.flags &
1121 (IP6_TNL_F_USE_ORIG_TCLASS |
1122 IP6_TNL_F_USE_ORIG_FWMARK))) {
1123 /* enable the cache only if neither the outer protocol nor the
1124 * routing decision depends on the current inner header value
1125 */
1126 use_cache = true;
1127 }
1128
1129 if (use_cache)
1130 dst = dst_cache_get(&t->dst_cache);
1131
1132 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1133 goto tx_err_link_failure;
1134
1135 if (!dst) {
1136 route_lookup:
1137 /* add dsfield to flowlabel for route lookup */
1138 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1139
1140 dst = ip6_route_output(net, NULL, fl6);
1141
1142 if (dst->error)
1143 goto tx_err_link_failure;
1144 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1145 if (IS_ERR(dst)) {
1146 err = PTR_ERR(dst);
1147 dst = NULL;
1148 goto tx_err_link_failure;
1149 }
1150 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1151 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1152 &fl6->daddr, 0, &fl6->saddr))
1153 goto tx_err_link_failure;
1154 ndst = dst;
1155 }
1156
1157 tdev = dst->dev;
1158
1159 if (tdev == dev) {
1160 stats->collisions++;
1161 net_warn_ratelimited("%s: Local routing loop detected!\n",
1162 t->parms.name);
1163 goto tx_err_dst_release;
1164 }
1165 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1166 if (encap_limit >= 0) {
1167 max_headroom += 8;
1168 mtu -= 8;
1169 }
1170 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1171 IPV6_MIN_MTU : IPV4_MIN_MTU);
1172
1173 skb_dst_update_pmtu_no_confirm(skb, mtu);
1174 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1175 *pmtu = mtu;
1176 err = -EMSGSIZE;
1177 goto tx_err_dst_release;
1178 }
1179
1180 if (t->err_count > 0) {
1181 if (time_before(jiffies,
1182 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1183 t->err_count--;
1184
1185 dst_link_failure(skb);
1186 } else {
1187 t->err_count = 0;
1188 }
1189 }
1190
1191 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1192
1193 /*
1194 * Okay, now see if we can stuff it in the buffer as-is.
1195 */
1196 max_headroom += LL_RESERVED_SPACE(tdev);
1197
1198 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1199 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1200 struct sk_buff *new_skb;
1201
1202 new_skb = skb_realloc_headroom(skb, max_headroom);
1203 if (!new_skb)
1204 goto tx_err_dst_release;
1205
1206 if (skb->sk)
1207 skb_set_owner_w(new_skb, skb->sk);
1208 consume_skb(skb);
1209 skb = new_skb;
1210 }
1211
1212 if (t->parms.collect_md) {
1213 if (t->encap.type != TUNNEL_ENCAP_NONE)
1214 goto tx_err_dst_release;
1215 } else {
1216 if (use_cache && ndst)
1217 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1218 }
1219 skb_dst_set(skb, dst);
1220
1221 if (hop_limit == 0) {
1222 if (skb->protocol == htons(ETH_P_IP))
1223 hop_limit = ip_hdr(skb)->ttl;
1224 else if (skb->protocol == htons(ETH_P_IPV6))
1225 hop_limit = ipv6_hdr(skb)->hop_limit;
1226 else
1227 hop_limit = ip6_dst_hoplimit(dst);
1228 }
1229
1230 /* Calculate max headroom for all the headers and adjust
1231 * needed_headroom if necessary.
1232 */
1233 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1234 + dst->header_len + t->hlen;
1235 if (max_headroom > READ_ONCE(dev->needed_headroom))
1236 WRITE_ONCE(dev->needed_headroom, max_headroom);
1237
1238 err = ip6_tnl_encap(skb, t, &proto, fl6);
1239 if (err)
1240 return err;
1241
1242 if (encap_limit >= 0) {
1243 init_tel_txopt(&opt, encap_limit);
1244 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1245 }
1246
1247 skb_push(skb, sizeof(struct ipv6hdr));
1248 skb_reset_network_header(skb);
1249 ipv6h = ipv6_hdr(skb);
1250 ip6_flow_hdr(ipv6h, dsfield,
1251 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1252 ipv6h->hop_limit = hop_limit;
1253 ipv6h->nexthdr = proto;
1254 ipv6h->saddr = fl6->saddr;
1255 ipv6h->daddr = fl6->daddr;
1256 ip6tunnel_xmit(NULL, skb, dev);
1257 return 0;
1258 tx_err_link_failure:
1259 stats->tx_carrier_errors++;
1260 dst_link_failure(skb);
1261 tx_err_dst_release:
1262 dst_release(dst);
1263 return err;
1264 }
1265 EXPORT_SYMBOL(ip6_tnl_xmit);
1266
1267 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1268 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1269 u8 protocol)
1270 {
1271 struct ip6_tnl *t = netdev_priv(dev);
1272 struct ipv6hdr *ipv6h;
1273 const struct iphdr *iph;
1274 int encap_limit = -1;
1275 __u16 offset;
1276 struct flowi6 fl6;
1277 __u8 dsfield, orig_dsfield;
1278 __u32 mtu;
1279 u8 tproto;
1280 int err;
1281
1282 tproto = READ_ONCE(t->parms.proto);
1283 if (tproto != protocol && tproto != 0)
1284 return -1;
1285
1286 if (t->parms.collect_md) {
1287 struct ip_tunnel_info *tun_info;
1288 const struct ip_tunnel_key *key;
1289
1290 tun_info = skb_tunnel_info(skb);
1291 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1292 ip_tunnel_info_af(tun_info) != AF_INET6))
1293 return -1;
1294 key = &tun_info->key;
1295 memset(&fl6, 0, sizeof(fl6));
1296 fl6.flowi6_proto = protocol;
1297 fl6.saddr = key->u.ipv6.src;
1298 fl6.daddr = key->u.ipv6.dst;
1299 fl6.flowlabel = key->label;
1300 dsfield = key->tos;
1301 switch (protocol) {
1302 case IPPROTO_IPIP:
1303 iph = ip_hdr(skb);
1304 orig_dsfield = ipv4_get_dsfield(iph);
1305 break;
1306 case IPPROTO_IPV6:
1307 ipv6h = ipv6_hdr(skb);
1308 orig_dsfield = ipv6_get_dsfield(ipv6h);
1309 break;
1310 default:
1311 orig_dsfield = dsfield;
1312 break;
1313 }
1314 } else {
1315 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1316 encap_limit = t->parms.encap_limit;
1317 if (protocol == IPPROTO_IPV6) {
1318 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1319 skb_network_header(skb));
1320 /* ip6_tnl_parse_tlv_enc_lim() might have
1321 * reallocated skb->head
1322 */
1323 if (offset > 0) {
1324 struct ipv6_tlv_tnl_enc_lim *tel;
1325
1326 tel = (void *)&skb_network_header(skb)[offset];
1327 if (tel->encap_limit == 0) {
1328 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1329 ICMPV6_HDR_FIELD, offset + 2);
1330 return -1;
1331 }
1332 encap_limit = tel->encap_limit - 1;
1333 }
1334 }
1335
1336 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1337 fl6.flowi6_proto = protocol;
1338
1339 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1340 fl6.flowi6_mark = skb->mark;
1341 else
1342 fl6.flowi6_mark = t->parms.fwmark;
1343 switch (protocol) {
1344 case IPPROTO_IPIP:
1345 iph = ip_hdr(skb);
1346 orig_dsfield = ipv4_get_dsfield(iph);
1347 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1348 dsfield = orig_dsfield;
1349 else
1350 dsfield = ip6_tclass(t->parms.flowinfo);
1351 break;
1352 case IPPROTO_IPV6:
1353 ipv6h = ipv6_hdr(skb);
1354 orig_dsfield = ipv6_get_dsfield(ipv6h);
1355 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1356 dsfield = orig_dsfield;
1357 else
1358 dsfield = ip6_tclass(t->parms.flowinfo);
1359 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1360 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1361 break;
1362 default:
1363 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1364 break;
1365 }
1366 }
1367
1368 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1369 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1370
1371 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1372 return -1;
1373
1374 skb_set_inner_ipproto(skb, protocol);
1375
1376 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1377 protocol);
1378 if (err != 0) {
1379 /* XXX: send ICMP error even if DF is not set. */
1380 if (err == -EMSGSIZE)
1381 switch (protocol) {
1382 case IPPROTO_IPIP:
1383 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1384 ICMP_FRAG_NEEDED, htonl(mtu));
1385 break;
1386 case IPPROTO_IPV6:
1387 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1388 break;
1389 default:
1390 break;
1391 }
1392 return -1;
1393 }
1394
1395 return 0;
1396 }
1397
1398 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1399 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1400 {
1401 struct ip6_tnl *t = netdev_priv(dev);
1402 struct net_device_stats *stats = &t->dev->stats;
1403 u8 ipproto;
1404 int ret;
1405
1406 if (!pskb_inet_may_pull(skb))
1407 goto tx_err;
1408
1409 switch (skb->protocol) {
1410 case htons(ETH_P_IP):
1411 ipproto = IPPROTO_IPIP;
1412 break;
1413 case htons(ETH_P_IPV6):
1414 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1415 goto tx_err;
1416 ipproto = IPPROTO_IPV6;
1417 break;
1418 case htons(ETH_P_MPLS_UC):
1419 ipproto = IPPROTO_MPLS;
1420 break;
1421 default:
1422 goto tx_err;
1423 }
1424
1425 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1426 if (ret < 0)
1427 goto tx_err;
1428
1429 return NETDEV_TX_OK;
1430
1431 tx_err:
1432 stats->tx_errors++;
1433 stats->tx_dropped++;
1434 kfree_skb(skb);
1435 return NETDEV_TX_OK;
1436 }
1437
ip6_tnl_link_config(struct ip6_tnl * t)1438 static void ip6_tnl_link_config(struct ip6_tnl *t)
1439 {
1440 struct net_device *dev = t->dev;
1441 struct net_device *tdev = NULL;
1442 struct __ip6_tnl_parm *p = &t->parms;
1443 struct flowi6 *fl6 = &t->fl.u.ip6;
1444 int t_hlen;
1445 int mtu;
1446
1447 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1448 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1449
1450 /* Set up flowi template */
1451 fl6->saddr = p->laddr;
1452 fl6->daddr = p->raddr;
1453 fl6->flowi6_oif = p->link;
1454 fl6->flowlabel = 0;
1455
1456 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1457 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1458 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1459 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1460
1461 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1462 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1463
1464 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1465 dev->flags |= IFF_POINTOPOINT;
1466 else
1467 dev->flags &= ~IFF_POINTOPOINT;
1468
1469 t->tun_hlen = 0;
1470 t->hlen = t->encap_hlen + t->tun_hlen;
1471 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1472
1473 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1474 int strict = (ipv6_addr_type(&p->raddr) &
1475 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1476
1477 struct rt6_info *rt = rt6_lookup(t->net,
1478 &p->raddr, &p->laddr,
1479 p->link, NULL, strict);
1480 if (rt) {
1481 tdev = rt->dst.dev;
1482 ip6_rt_put(rt);
1483 }
1484
1485 if (!tdev && p->link)
1486 tdev = __dev_get_by_index(t->net, p->link);
1487
1488 if (tdev) {
1489 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1490 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1491
1492 mtu = mtu - t_hlen;
1493 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1494 mtu -= 8;
1495
1496 if (mtu < IPV6_MIN_MTU)
1497 mtu = IPV6_MIN_MTU;
1498 WRITE_ONCE(dev->mtu, mtu);
1499 }
1500 }
1501 }
1502
1503 /**
1504 * ip6_tnl_change - update the tunnel parameters
1505 * @t: tunnel to be changed
1506 * @p: tunnel configuration parameters
1507 *
1508 * Description:
1509 * ip6_tnl_change() updates the tunnel parameters
1510 **/
1511
1512 static int
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1513 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1514 {
1515 t->parms.laddr = p->laddr;
1516 t->parms.raddr = p->raddr;
1517 t->parms.flags = p->flags;
1518 t->parms.hop_limit = p->hop_limit;
1519 t->parms.encap_limit = p->encap_limit;
1520 t->parms.flowinfo = p->flowinfo;
1521 t->parms.link = p->link;
1522 t->parms.proto = p->proto;
1523 t->parms.fwmark = p->fwmark;
1524 dst_cache_reset(&t->dst_cache);
1525 ip6_tnl_link_config(t);
1526 return 0;
1527 }
1528
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1529 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1530 {
1531 struct net *net = t->net;
1532 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1533 int err;
1534
1535 ip6_tnl_unlink(ip6n, t);
1536 synchronize_net();
1537 err = ip6_tnl_change(t, p);
1538 ip6_tnl_link(ip6n, t);
1539 netdev_state_change(t->dev);
1540 return err;
1541 }
1542
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1543 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1544 {
1545 /* for default tnl0 device allow to change only the proto */
1546 t->parms.proto = p->proto;
1547 netdev_state_change(t->dev);
1548 return 0;
1549 }
1550
1551 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1552 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1553 {
1554 p->laddr = u->laddr;
1555 p->raddr = u->raddr;
1556 p->flags = u->flags;
1557 p->hop_limit = u->hop_limit;
1558 p->encap_limit = u->encap_limit;
1559 p->flowinfo = u->flowinfo;
1560 p->link = u->link;
1561 p->proto = u->proto;
1562 memcpy(p->name, u->name, sizeof(u->name));
1563 }
1564
1565 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1566 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1567 {
1568 u->laddr = p->laddr;
1569 u->raddr = p->raddr;
1570 u->flags = p->flags;
1571 u->hop_limit = p->hop_limit;
1572 u->encap_limit = p->encap_limit;
1573 u->flowinfo = p->flowinfo;
1574 u->link = p->link;
1575 u->proto = p->proto;
1576 memcpy(u->name, p->name, sizeof(u->name));
1577 }
1578
1579 /**
1580 * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace
1581 * @dev: virtual device associated with tunnel
1582 * @ifr: unused
1583 * @data: parameters passed from userspace
1584 * @cmd: command to be performed
1585 *
1586 * Description:
1587 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1588 * from userspace.
1589 *
1590 * The possible commands are the following:
1591 * %SIOCGETTUNNEL: get tunnel parameters for device
1592 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1593 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1594 * %SIOCDELTUNNEL: delete tunnel
1595 *
1596 * The fallback device "ip6tnl0", created during module
1597 * initialization, can be used for creating other tunnel devices.
1598 *
1599 * Return:
1600 * 0 on success,
1601 * %-EFAULT if unable to copy data to or from userspace,
1602 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1603 * %-EINVAL if passed tunnel parameters are invalid,
1604 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1605 * %-ENODEV if attempting to change or delete a nonexisting device
1606 **/
1607
1608 static int
ip6_tnl_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1609 ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1610 void __user *data, int cmd)
1611 {
1612 int err = 0;
1613 struct ip6_tnl_parm p;
1614 struct __ip6_tnl_parm p1;
1615 struct ip6_tnl *t = netdev_priv(dev);
1616 struct net *net = t->net;
1617 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1618
1619 memset(&p1, 0, sizeof(p1));
1620
1621 switch (cmd) {
1622 case SIOCGETTUNNEL:
1623 if (dev == ip6n->fb_tnl_dev) {
1624 if (copy_from_user(&p, data, sizeof(p))) {
1625 err = -EFAULT;
1626 break;
1627 }
1628 ip6_tnl_parm_from_user(&p1, &p);
1629 t = ip6_tnl_locate(net, &p1, 0);
1630 if (IS_ERR(t))
1631 t = netdev_priv(dev);
1632 } else {
1633 memset(&p, 0, sizeof(p));
1634 }
1635 ip6_tnl_parm_to_user(&p, &t->parms);
1636 if (copy_to_user(data, &p, sizeof(p)))
1637 err = -EFAULT;
1638 break;
1639 case SIOCADDTUNNEL:
1640 case SIOCCHGTUNNEL:
1641 err = -EPERM;
1642 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1643 break;
1644 err = -EFAULT;
1645 if (copy_from_user(&p, data, sizeof(p)))
1646 break;
1647 err = -EINVAL;
1648 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1649 p.proto != 0)
1650 break;
1651 ip6_tnl_parm_from_user(&p1, &p);
1652 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1653 if (cmd == SIOCCHGTUNNEL) {
1654 if (!IS_ERR(t)) {
1655 if (t->dev != dev) {
1656 err = -EEXIST;
1657 break;
1658 }
1659 } else
1660 t = netdev_priv(dev);
1661 if (dev == ip6n->fb_tnl_dev)
1662 err = ip6_tnl0_update(t, &p1);
1663 else
1664 err = ip6_tnl_update(t, &p1);
1665 }
1666 if (!IS_ERR(t)) {
1667 err = 0;
1668 ip6_tnl_parm_to_user(&p, &t->parms);
1669 if (copy_to_user(data, &p, sizeof(p)))
1670 err = -EFAULT;
1671
1672 } else {
1673 err = PTR_ERR(t);
1674 }
1675 break;
1676 case SIOCDELTUNNEL:
1677 err = -EPERM;
1678 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1679 break;
1680
1681 if (dev == ip6n->fb_tnl_dev) {
1682 err = -EFAULT;
1683 if (copy_from_user(&p, data, sizeof(p)))
1684 break;
1685 err = -ENOENT;
1686 ip6_tnl_parm_from_user(&p1, &p);
1687 t = ip6_tnl_locate(net, &p1, 0);
1688 if (IS_ERR(t))
1689 break;
1690 err = -EPERM;
1691 if (t->dev == ip6n->fb_tnl_dev)
1692 break;
1693 dev = t->dev;
1694 }
1695 err = 0;
1696 unregister_netdevice(dev);
1697 break;
1698 default:
1699 err = -EINVAL;
1700 }
1701 return err;
1702 }
1703
1704 /**
1705 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1706 * @dev: virtual device associated with tunnel
1707 * @new_mtu: the new mtu
1708 *
1709 * Return:
1710 * 0 on success,
1711 * %-EINVAL if mtu too small
1712 **/
1713
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1714 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1715 {
1716 struct ip6_tnl *tnl = netdev_priv(dev);
1717
1718 if (tnl->parms.proto == IPPROTO_IPV6) {
1719 if (new_mtu < IPV6_MIN_MTU)
1720 return -EINVAL;
1721 } else {
1722 if (new_mtu < ETH_MIN_MTU)
1723 return -EINVAL;
1724 }
1725 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1726 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1727 return -EINVAL;
1728 } else {
1729 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1730 return -EINVAL;
1731 }
1732 dev->mtu = new_mtu;
1733 return 0;
1734 }
1735 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1736
ip6_tnl_get_iflink(const struct net_device * dev)1737 int ip6_tnl_get_iflink(const struct net_device *dev)
1738 {
1739 struct ip6_tnl *t = netdev_priv(dev);
1740
1741 return t->parms.link;
1742 }
1743 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1744
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1745 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1746 unsigned int num)
1747 {
1748 if (num >= MAX_IPTUN_ENCAP_OPS)
1749 return -ERANGE;
1750
1751 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1752 &ip6tun_encaps[num],
1753 NULL, ops) ? 0 : -1;
1754 }
1755 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1756
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1757 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1758 unsigned int num)
1759 {
1760 int ret;
1761
1762 if (num >= MAX_IPTUN_ENCAP_OPS)
1763 return -ERANGE;
1764
1765 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1766 &ip6tun_encaps[num],
1767 ops, NULL) == ops) ? 0 : -1;
1768
1769 synchronize_net();
1770
1771 return ret;
1772 }
1773 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1774
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1775 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1776 struct ip_tunnel_encap *ipencap)
1777 {
1778 int hlen;
1779
1780 memset(&t->encap, 0, sizeof(t->encap));
1781
1782 hlen = ip6_encap_hlen(ipencap);
1783 if (hlen < 0)
1784 return hlen;
1785
1786 t->encap.type = ipencap->type;
1787 t->encap.sport = ipencap->sport;
1788 t->encap.dport = ipencap->dport;
1789 t->encap.flags = ipencap->flags;
1790
1791 t->encap_hlen = hlen;
1792 t->hlen = t->encap_hlen + t->tun_hlen;
1793
1794 return 0;
1795 }
1796 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1797
1798 static const struct net_device_ops ip6_tnl_netdev_ops = {
1799 .ndo_init = ip6_tnl_dev_init,
1800 .ndo_uninit = ip6_tnl_dev_uninit,
1801 .ndo_start_xmit = ip6_tnl_start_xmit,
1802 .ndo_siocdevprivate = ip6_tnl_siocdevprivate,
1803 .ndo_change_mtu = ip6_tnl_change_mtu,
1804 .ndo_get_stats64 = dev_get_tstats64,
1805 .ndo_get_iflink = ip6_tnl_get_iflink,
1806 };
1807
1808 #define IPXIPX_FEATURES (NETIF_F_SG | \
1809 NETIF_F_FRAGLIST | \
1810 NETIF_F_HIGHDMA | \
1811 NETIF_F_GSO_SOFTWARE | \
1812 NETIF_F_HW_CSUM)
1813
1814 /**
1815 * ip6_tnl_dev_setup - setup virtual tunnel device
1816 * @dev: virtual device associated with tunnel
1817 *
1818 * Description:
1819 * Initialize function pointers and device parameters
1820 **/
1821
ip6_tnl_dev_setup(struct net_device * dev)1822 static void ip6_tnl_dev_setup(struct net_device *dev)
1823 {
1824 dev->netdev_ops = &ip6_tnl_netdev_ops;
1825 dev->header_ops = &ip_tunnel_header_ops;
1826 dev->needs_free_netdev = true;
1827 dev->priv_destructor = ip6_dev_free;
1828
1829 dev->type = ARPHRD_TUNNEL6;
1830 dev->flags |= IFF_NOARP;
1831 dev->addr_len = sizeof(struct in6_addr);
1832 dev->features |= NETIF_F_LLTX;
1833 netif_keep_dst(dev);
1834
1835 dev->features |= IPXIPX_FEATURES;
1836 dev->hw_features |= IPXIPX_FEATURES;
1837
1838 /* This perm addr will be used as interface identifier by IPv6 */
1839 dev->addr_assign_type = NET_ADDR_RANDOM;
1840 eth_random_addr(dev->perm_addr);
1841 }
1842
1843
1844 /**
1845 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1846 * @dev: virtual device associated with tunnel
1847 **/
1848
1849 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1850 ip6_tnl_dev_init_gen(struct net_device *dev)
1851 {
1852 struct ip6_tnl *t = netdev_priv(dev);
1853 int ret;
1854 int t_hlen;
1855
1856 t->dev = dev;
1857 t->net = dev_net(dev);
1858 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1859 if (!dev->tstats)
1860 return -ENOMEM;
1861
1862 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1863 if (ret)
1864 goto free_stats;
1865
1866 ret = gro_cells_init(&t->gro_cells, dev);
1867 if (ret)
1868 goto destroy_dst;
1869
1870 t->tun_hlen = 0;
1871 t->hlen = t->encap_hlen + t->tun_hlen;
1872 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1873
1874 dev->type = ARPHRD_TUNNEL6;
1875 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1876 dev->mtu = ETH_DATA_LEN - t_hlen;
1877 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1878 dev->mtu -= 8;
1879 dev->min_mtu = ETH_MIN_MTU;
1880 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1881
1882 dev_hold(dev);
1883 return 0;
1884
1885 destroy_dst:
1886 dst_cache_destroy(&t->dst_cache);
1887 free_stats:
1888 free_percpu(dev->tstats);
1889 dev->tstats = NULL;
1890
1891 return ret;
1892 }
1893
1894 /**
1895 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1896 * @dev: virtual device associated with tunnel
1897 **/
1898
ip6_tnl_dev_init(struct net_device * dev)1899 static int ip6_tnl_dev_init(struct net_device *dev)
1900 {
1901 struct ip6_tnl *t = netdev_priv(dev);
1902 int err = ip6_tnl_dev_init_gen(dev);
1903
1904 if (err)
1905 return err;
1906 ip6_tnl_link_config(t);
1907 if (t->parms.collect_md)
1908 netif_keep_dst(dev);
1909 return 0;
1910 }
1911
1912 /**
1913 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1914 * @dev: fallback device
1915 *
1916 * Return: 0
1917 **/
1918
ip6_fb_tnl_dev_init(struct net_device * dev)1919 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1920 {
1921 struct ip6_tnl *t = netdev_priv(dev);
1922 struct net *net = dev_net(dev);
1923 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1924
1925 t->parms.proto = IPPROTO_IPV6;
1926
1927 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1928 return 0;
1929 }
1930
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1931 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1932 struct netlink_ext_ack *extack)
1933 {
1934 u8 proto;
1935
1936 if (!data || !data[IFLA_IPTUN_PROTO])
1937 return 0;
1938
1939 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1940 if (proto != IPPROTO_IPV6 &&
1941 proto != IPPROTO_IPIP &&
1942 proto != 0)
1943 return -EINVAL;
1944
1945 return 0;
1946 }
1947
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1948 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1949 struct __ip6_tnl_parm *parms)
1950 {
1951 memset(parms, 0, sizeof(*parms));
1952
1953 if (!data)
1954 return;
1955
1956 if (data[IFLA_IPTUN_LINK])
1957 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1958
1959 if (data[IFLA_IPTUN_LOCAL])
1960 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1961
1962 if (data[IFLA_IPTUN_REMOTE])
1963 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1964
1965 if (data[IFLA_IPTUN_TTL])
1966 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1967
1968 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1969 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1970
1971 if (data[IFLA_IPTUN_FLOWINFO])
1972 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1973
1974 if (data[IFLA_IPTUN_FLAGS])
1975 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1976
1977 if (data[IFLA_IPTUN_PROTO])
1978 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1979
1980 if (data[IFLA_IPTUN_COLLECT_METADATA])
1981 parms->collect_md = true;
1982
1983 if (data[IFLA_IPTUN_FWMARK])
1984 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1985 }
1986
ip6_tnl_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)1987 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1988 struct ip_tunnel_encap *ipencap)
1989 {
1990 bool ret = false;
1991
1992 memset(ipencap, 0, sizeof(*ipencap));
1993
1994 if (!data)
1995 return ret;
1996
1997 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1998 ret = true;
1999 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2000 }
2001
2002 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2003 ret = true;
2004 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2005 }
2006
2007 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2008 ret = true;
2009 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2010 }
2011
2012 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2013 ret = true;
2014 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2015 }
2016
2017 return ret;
2018 }
2019
ip6_tnl_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2020 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2021 struct nlattr *tb[], struct nlattr *data[],
2022 struct netlink_ext_ack *extack)
2023 {
2024 struct net *net = dev_net(dev);
2025 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2026 struct ip_tunnel_encap ipencap;
2027 struct ip6_tnl *nt, *t;
2028 int err;
2029
2030 nt = netdev_priv(dev);
2031
2032 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2033 err = ip6_tnl_encap_setup(nt, &ipencap);
2034 if (err < 0)
2035 return err;
2036 }
2037
2038 ip6_tnl_netlink_parms(data, &nt->parms);
2039
2040 if (nt->parms.collect_md) {
2041 if (rtnl_dereference(ip6n->collect_md_tun))
2042 return -EEXIST;
2043 } else {
2044 t = ip6_tnl_locate(net, &nt->parms, 0);
2045 if (!IS_ERR(t))
2046 return -EEXIST;
2047 }
2048
2049 err = ip6_tnl_create2(dev);
2050 if (!err && tb[IFLA_MTU])
2051 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2052
2053 return err;
2054 }
2055
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2056 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2057 struct nlattr *data[],
2058 struct netlink_ext_ack *extack)
2059 {
2060 struct ip6_tnl *t = netdev_priv(dev);
2061 struct __ip6_tnl_parm p;
2062 struct net *net = t->net;
2063 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2064 struct ip_tunnel_encap ipencap;
2065
2066 if (dev == ip6n->fb_tnl_dev)
2067 return -EINVAL;
2068
2069 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2070 int err = ip6_tnl_encap_setup(t, &ipencap);
2071
2072 if (err < 0)
2073 return err;
2074 }
2075 ip6_tnl_netlink_parms(data, &p);
2076 if (p.collect_md)
2077 return -EINVAL;
2078
2079 t = ip6_tnl_locate(net, &p, 0);
2080 if (!IS_ERR(t)) {
2081 if (t->dev != dev)
2082 return -EEXIST;
2083 } else
2084 t = netdev_priv(dev);
2085
2086 return ip6_tnl_update(t, &p);
2087 }
2088
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2089 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2090 {
2091 struct net *net = dev_net(dev);
2092 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2093
2094 if (dev != ip6n->fb_tnl_dev)
2095 unregister_netdevice_queue(dev, head);
2096 }
2097
ip6_tnl_get_size(const struct net_device * dev)2098 static size_t ip6_tnl_get_size(const struct net_device *dev)
2099 {
2100 return
2101 /* IFLA_IPTUN_LINK */
2102 nla_total_size(4) +
2103 /* IFLA_IPTUN_LOCAL */
2104 nla_total_size(sizeof(struct in6_addr)) +
2105 /* IFLA_IPTUN_REMOTE */
2106 nla_total_size(sizeof(struct in6_addr)) +
2107 /* IFLA_IPTUN_TTL */
2108 nla_total_size(1) +
2109 /* IFLA_IPTUN_ENCAP_LIMIT */
2110 nla_total_size(1) +
2111 /* IFLA_IPTUN_FLOWINFO */
2112 nla_total_size(4) +
2113 /* IFLA_IPTUN_FLAGS */
2114 nla_total_size(4) +
2115 /* IFLA_IPTUN_PROTO */
2116 nla_total_size(1) +
2117 /* IFLA_IPTUN_ENCAP_TYPE */
2118 nla_total_size(2) +
2119 /* IFLA_IPTUN_ENCAP_FLAGS */
2120 nla_total_size(2) +
2121 /* IFLA_IPTUN_ENCAP_SPORT */
2122 nla_total_size(2) +
2123 /* IFLA_IPTUN_ENCAP_DPORT */
2124 nla_total_size(2) +
2125 /* IFLA_IPTUN_COLLECT_METADATA */
2126 nla_total_size(0) +
2127 /* IFLA_IPTUN_FWMARK */
2128 nla_total_size(4) +
2129 0;
2130 }
2131
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2132 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2133 {
2134 struct ip6_tnl *tunnel = netdev_priv(dev);
2135 struct __ip6_tnl_parm *parm = &tunnel->parms;
2136
2137 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2138 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2139 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2140 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2141 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2142 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2143 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2144 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2145 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2146 goto nla_put_failure;
2147
2148 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2149 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2150 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2151 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2152 goto nla_put_failure;
2153
2154 if (parm->collect_md)
2155 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2156 goto nla_put_failure;
2157
2158 return 0;
2159
2160 nla_put_failure:
2161 return -EMSGSIZE;
2162 }
2163
ip6_tnl_get_link_net(const struct net_device * dev)2164 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2165 {
2166 struct ip6_tnl *tunnel = netdev_priv(dev);
2167
2168 return tunnel->net;
2169 }
2170 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2171
2172 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2173 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2174 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2175 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2176 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2177 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2178 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2179 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2180 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2181 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2182 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2183 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2184 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2185 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2186 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2187 };
2188
2189 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2190 .kind = "ip6tnl",
2191 .maxtype = IFLA_IPTUN_MAX,
2192 .policy = ip6_tnl_policy,
2193 .priv_size = sizeof(struct ip6_tnl),
2194 .setup = ip6_tnl_dev_setup,
2195 .validate = ip6_tnl_validate,
2196 .newlink = ip6_tnl_newlink,
2197 .changelink = ip6_tnl_changelink,
2198 .dellink = ip6_tnl_dellink,
2199 .get_size = ip6_tnl_get_size,
2200 .fill_info = ip6_tnl_fill_info,
2201 .get_link_net = ip6_tnl_get_link_net,
2202 };
2203
2204 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2205 .handler = ip4ip6_rcv,
2206 .err_handler = ip4ip6_err,
2207 .priority = 1,
2208 };
2209
2210 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2211 .handler = ip6ip6_rcv,
2212 .err_handler = ip6ip6_err,
2213 .priority = 1,
2214 };
2215
2216 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2217 .handler = mplsip6_rcv,
2218 .err_handler = mplsip6_err,
2219 .priority = 1,
2220 };
2221
ip6_tnl_destroy_tunnels(struct net * net,struct list_head * list)2222 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2223 {
2224 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2225 struct net_device *dev, *aux;
2226 int h;
2227 struct ip6_tnl *t;
2228
2229 for_each_netdev_safe(net, dev, aux)
2230 if (dev->rtnl_link_ops == &ip6_link_ops)
2231 unregister_netdevice_queue(dev, list);
2232
2233 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2234 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2235 while (t) {
2236 /* If dev is in the same netns, it has already
2237 * been added to the list by the previous loop.
2238 */
2239 if (!net_eq(dev_net(t->dev), net))
2240 unregister_netdevice_queue(t->dev, list);
2241 t = rtnl_dereference(t->next);
2242 }
2243 }
2244
2245 t = rtnl_dereference(ip6n->tnls_wc[0]);
2246 while (t) {
2247 /* If dev is in the same netns, it has already
2248 * been added to the list by the previous loop.
2249 */
2250 if (!net_eq(dev_net(t->dev), net))
2251 unregister_netdevice_queue(t->dev, list);
2252 t = rtnl_dereference(t->next);
2253 }
2254 }
2255
ip6_tnl_init_net(struct net * net)2256 static int __net_init ip6_tnl_init_net(struct net *net)
2257 {
2258 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2259 struct ip6_tnl *t = NULL;
2260 int err;
2261
2262 ip6n->tnls[0] = ip6n->tnls_wc;
2263 ip6n->tnls[1] = ip6n->tnls_r_l;
2264
2265 if (!net_has_fallback_tunnels(net))
2266 return 0;
2267 err = -ENOMEM;
2268 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2269 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2270
2271 if (!ip6n->fb_tnl_dev)
2272 goto err_alloc_dev;
2273 dev_net_set(ip6n->fb_tnl_dev, net);
2274 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2275 /* FB netdevice is special: we have one, and only one per netns.
2276 * Allowing to move it to another netns is clearly unsafe.
2277 */
2278 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2279
2280 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2281 if (err < 0)
2282 goto err_register;
2283
2284 err = register_netdev(ip6n->fb_tnl_dev);
2285 if (err < 0)
2286 goto err_register;
2287
2288 t = netdev_priv(ip6n->fb_tnl_dev);
2289
2290 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2291 return 0;
2292
2293 err_register:
2294 free_netdev(ip6n->fb_tnl_dev);
2295 err_alloc_dev:
2296 return err;
2297 }
2298
ip6_tnl_exit_batch_net(struct list_head * net_list)2299 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2300 {
2301 struct net *net;
2302 LIST_HEAD(list);
2303
2304 rtnl_lock();
2305 list_for_each_entry(net, net_list, exit_list)
2306 ip6_tnl_destroy_tunnels(net, &list);
2307 unregister_netdevice_many(&list);
2308 rtnl_unlock();
2309 }
2310
2311 static struct pernet_operations ip6_tnl_net_ops = {
2312 .init = ip6_tnl_init_net,
2313 .exit_batch = ip6_tnl_exit_batch_net,
2314 .id = &ip6_tnl_net_id,
2315 .size = sizeof(struct ip6_tnl_net),
2316 };
2317
2318 /**
2319 * ip6_tunnel_init - register protocol and reserve needed resources
2320 *
2321 * Return: 0 on success
2322 **/
2323
ip6_tunnel_init(void)2324 static int __init ip6_tunnel_init(void)
2325 {
2326 int err;
2327
2328 if (!ipv6_mod_enabled())
2329 return -EOPNOTSUPP;
2330
2331 err = register_pernet_device(&ip6_tnl_net_ops);
2332 if (err < 0)
2333 goto out_pernet;
2334
2335 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2336 if (err < 0) {
2337 pr_err("%s: can't register ip4ip6\n", __func__);
2338 goto out_ip4ip6;
2339 }
2340
2341 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2342 if (err < 0) {
2343 pr_err("%s: can't register ip6ip6\n", __func__);
2344 goto out_ip6ip6;
2345 }
2346
2347 if (ip6_tnl_mpls_supported()) {
2348 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2349 if (err < 0) {
2350 pr_err("%s: can't register mplsip6\n", __func__);
2351 goto out_mplsip6;
2352 }
2353 }
2354
2355 err = rtnl_link_register(&ip6_link_ops);
2356 if (err < 0)
2357 goto rtnl_link_failed;
2358
2359 return 0;
2360
2361 rtnl_link_failed:
2362 if (ip6_tnl_mpls_supported())
2363 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2364 out_mplsip6:
2365 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2366 out_ip6ip6:
2367 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2368 out_ip4ip6:
2369 unregister_pernet_device(&ip6_tnl_net_ops);
2370 out_pernet:
2371 return err;
2372 }
2373
2374 /**
2375 * ip6_tunnel_cleanup - free resources and unregister protocol
2376 **/
2377
ip6_tunnel_cleanup(void)2378 static void __exit ip6_tunnel_cleanup(void)
2379 {
2380 rtnl_link_unregister(&ip6_link_ops);
2381 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2382 pr_info("%s: can't deregister ip4ip6\n", __func__);
2383
2384 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2385 pr_info("%s: can't deregister ip6ip6\n", __func__);
2386
2387 if (ip6_tnl_mpls_supported() &&
2388 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2389 pr_info("%s: can't deregister mplsip6\n", __func__);
2390 unregister_pernet_device(&ip6_tnl_net_ops);
2391 }
2392
2393 module_init(ip6_tunnel_init);
2394 module_exit(ip6_tunnel_cleanup);
2395