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/netdev_lock.h>
56 #include <net/dst_metadata.h>
57 #include <net/inet_dscp.h>
58
59 MODULE_AUTHOR("Ville Nuorvala");
60 MODULE_DESCRIPTION("IPv6 tunneling device");
61 MODULE_LICENSE("GPL");
62 MODULE_ALIAS_RTNL_LINK("ip6tnl");
63 MODULE_ALIAS_NETDEV("ip6tnl0");
64
65 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
66 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
67
68 static bool log_ecn_error = true;
69 module_param(log_ecn_error, bool, 0644);
70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
71
HASH(const struct in6_addr * addr1,const struct in6_addr * addr2)72 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
73 {
74 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
75
76 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
77 }
78
79 static int ip6_tnl_dev_init(struct net_device *dev);
80 static void ip6_tnl_dev_setup(struct net_device *dev);
81 static struct rtnl_link_ops ip6_link_ops __read_mostly;
82
83 static unsigned int ip6_tnl_net_id __read_mostly;
84 struct ip6_tnl_net {
85 /* the IPv6 tunnel fallback device */
86 struct net_device *fb_tnl_dev;
87 /* lists for storing tunnels in use */
88 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
89 struct ip6_tnl __rcu *tnls_wc[1];
90 struct ip6_tnl __rcu **tnls[2];
91 struct ip6_tnl __rcu *collect_md_tun;
92 };
93
ip6_tnl_mpls_supported(void)94 static inline int ip6_tnl_mpls_supported(void)
95 {
96 return IS_ENABLED(CONFIG_MPLS);
97 }
98
99 #define for_each_ip6_tunnel_rcu(start) \
100 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
101
102 /**
103 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
104 * @net: network namespace
105 * @link: ifindex of underlying interface
106 * @remote: the address of the tunnel exit-point
107 * @local: the address of the tunnel entry-point
108 *
109 * Return:
110 * tunnel matching given end-points if found,
111 * else fallback tunnel if its device is up,
112 * else %NULL
113 **/
114
115 static struct ip6_tnl *
ip6_tnl_lookup(struct net * net,int link,const struct in6_addr * remote,const struct in6_addr * local)116 ip6_tnl_lookup(struct net *net, int link,
117 const struct in6_addr *remote, const struct in6_addr *local)
118 {
119 unsigned int hash = HASH(remote, local);
120 struct ip6_tnl *t, *cand = NULL;
121 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
122 struct in6_addr any;
123
124 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
125 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
126 !ipv6_addr_equal(remote, &t->parms.raddr) ||
127 !(t->dev->flags & IFF_UP))
128 continue;
129
130 if (link == t->parms.link)
131 return t;
132 else
133 cand = t;
134 }
135
136 memset(&any, 0, sizeof(any));
137 hash = HASH(&any, local);
138 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
139 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
140 !ipv6_addr_any(&t->parms.raddr) ||
141 !(t->dev->flags & IFF_UP))
142 continue;
143
144 if (link == t->parms.link)
145 return t;
146 else if (!cand)
147 cand = t;
148 }
149
150 hash = HASH(remote, &any);
151 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
152 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
153 !ipv6_addr_any(&t->parms.laddr) ||
154 !(t->dev->flags & IFF_UP))
155 continue;
156
157 if (link == t->parms.link)
158 return t;
159 else if (!cand)
160 cand = t;
161 }
162
163 if (cand)
164 return cand;
165
166 t = rcu_dereference(ip6n->collect_md_tun);
167 if (t && t->dev->flags & IFF_UP)
168 return t;
169
170 t = rcu_dereference(ip6n->tnls_wc[0]);
171 if (t && (t->dev->flags & IFF_UP))
172 return t;
173
174 return NULL;
175 }
176
177 /**
178 * ip6_tnl_bucket - get head of list matching given tunnel parameters
179 * @ip6n: the private data for ip6_vti in the netns
180 * @p: parameters containing tunnel end-points
181 *
182 * Description:
183 * ip6_tnl_bucket() returns the head of the list matching the
184 * &struct in6_addr entries laddr and raddr in @p.
185 *
186 * Return: head of IPv6 tunnel list
187 **/
188
189 static struct ip6_tnl __rcu **
ip6_tnl_bucket(struct ip6_tnl_net * ip6n,const struct __ip6_tnl_parm * p)190 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
191 {
192 const struct in6_addr *remote = &p->raddr;
193 const struct in6_addr *local = &p->laddr;
194 unsigned int h = 0;
195 int prio = 0;
196
197 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
198 prio = 1;
199 h = HASH(remote, local);
200 }
201 return &ip6n->tnls[prio][h];
202 }
203
204 /**
205 * ip6_tnl_link - add tunnel to hash table
206 * @ip6n: the private data for ip6_vti in the netns
207 * @t: tunnel to be added
208 **/
209
210 static void
ip6_tnl_link(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)211 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
212 {
213 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
214
215 if (t->parms.collect_md)
216 rcu_assign_pointer(ip6n->collect_md_tun, t);
217 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
218 rcu_assign_pointer(*tp, t);
219 }
220
221 /**
222 * ip6_tnl_unlink - remove tunnel from hash table
223 * @ip6n: the private data for ip6_vti in the netns
224 * @t: tunnel to be removed
225 **/
226
227 static void
ip6_tnl_unlink(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)228 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
229 {
230 struct ip6_tnl __rcu **tp;
231 struct ip6_tnl *iter;
232
233 if (t->parms.collect_md)
234 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
235
236 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
237 (iter = rtnl_dereference(*tp)) != NULL;
238 tp = &iter->next) {
239 if (t == iter) {
240 rcu_assign_pointer(*tp, t->next);
241 break;
242 }
243 }
244 }
245
ip6_dev_free(struct net_device * dev)246 static void ip6_dev_free(struct net_device *dev)
247 {
248 struct ip6_tnl *t = netdev_priv(dev);
249
250 gro_cells_destroy(&t->gro_cells);
251 dst_cache_destroy(&t->dst_cache);
252 }
253
ip6_tnl_create2(struct net_device * dev)254 static int ip6_tnl_create2(struct net_device *dev)
255 {
256 struct ip6_tnl *t = netdev_priv(dev);
257 struct ip6_tnl_net *ip6n = net_generic(t->net, ip6_tnl_net_id);
258 int err;
259
260 dev->rtnl_link_ops = &ip6_link_ops;
261 err = register_netdevice(dev);
262 if (err < 0)
263 goto out;
264
265 strcpy(t->parms.name, dev->name);
266
267 ip6_tnl_link(ip6n, t);
268 return 0;
269
270 out:
271 return err;
272 }
273
274 /**
275 * ip6_tnl_create - create a new tunnel
276 * @net: network namespace
277 * @p: tunnel parameters
278 *
279 * Description:
280 * Create tunnel matching given parameters.
281 *
282 * Return:
283 * created tunnel or error pointer
284 **/
285
ip6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)286 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
287 {
288 struct net_device *dev;
289 struct ip6_tnl *t;
290 char name[IFNAMSIZ];
291 int err = -E2BIG;
292
293 if (p->name[0]) {
294 if (!dev_valid_name(p->name))
295 goto failed;
296 strscpy(name, p->name, IFNAMSIZ);
297 } else {
298 sprintf(name, "ip6tnl%%d");
299 }
300 err = -ENOMEM;
301 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
302 ip6_tnl_dev_setup);
303 if (!dev)
304 goto failed;
305
306 dev_net_set(dev, net);
307
308 t = netdev_priv(dev);
309 t->parms = *p;
310 t->net = dev_net(dev);
311 err = ip6_tnl_create2(dev);
312 if (err < 0)
313 goto failed_free;
314
315 return t;
316
317 failed_free:
318 free_netdev(dev);
319 failed:
320 return ERR_PTR(err);
321 }
322
323 /**
324 * ip6_tnl_locate - find or create tunnel matching given parameters
325 * @net: network namespace
326 * @p: tunnel parameters
327 * @create: != 0 if allowed to create new tunnel if no match found
328 *
329 * Description:
330 * ip6_tnl_locate() first tries to locate an existing tunnel
331 * based on @parms. If this is unsuccessful, but @create is set a new
332 * tunnel device is created and registered for use.
333 *
334 * Return:
335 * matching tunnel or error pointer
336 **/
337
ip6_tnl_locate(struct net * net,struct __ip6_tnl_parm * p,int create)338 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
339 struct __ip6_tnl_parm *p, int create)
340 {
341 const struct in6_addr *remote = &p->raddr;
342 const struct in6_addr *local = &p->laddr;
343 struct ip6_tnl __rcu **tp;
344 struct ip6_tnl *t;
345 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
346
347 for (tp = ip6_tnl_bucket(ip6n, p);
348 (t = rtnl_dereference(*tp)) != NULL;
349 tp = &t->next) {
350 if (ipv6_addr_equal(local, &t->parms.laddr) &&
351 ipv6_addr_equal(remote, &t->parms.raddr) &&
352 p->link == t->parms.link) {
353 if (create)
354 return ERR_PTR(-EEXIST);
355
356 return t;
357 }
358 }
359 if (!create)
360 return ERR_PTR(-ENODEV);
361 return ip6_tnl_create(net, p);
362 }
363
364 /**
365 * ip6_tnl_dev_uninit - tunnel device uninitializer
366 * @dev: the device to be destroyed
367 *
368 * Description:
369 * ip6_tnl_dev_uninit() removes tunnel from its list
370 **/
371
372 static void
ip6_tnl_dev_uninit(struct net_device * dev)373 ip6_tnl_dev_uninit(struct net_device *dev)
374 {
375 struct ip6_tnl *t = netdev_priv(dev);
376 struct net *net = t->net;
377 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
378
379 if (dev == ip6n->fb_tnl_dev)
380 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
381 else
382 ip6_tnl_unlink(ip6n, t);
383 dst_cache_reset(&t->dst_cache);
384 netdev_put(dev, &t->dev_tracker);
385 }
386
387 /**
388 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
389 * @skb: received socket buffer
390 * @raw: the ICMPv6 error message data
391 *
392 * Return:
393 * 0 if none was found,
394 * else index to encapsulation limit
395 **/
396
ip6_tnl_parse_tlv_enc_lim(struct sk_buff * skb,__u8 * raw)397 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
398 {
399 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
400 unsigned int nhoff = raw - skb->data;
401 unsigned int off = nhoff + sizeof(*ipv6h);
402 u8 nexthdr = ipv6h->nexthdr;
403
404 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
405 struct ipv6_opt_hdr *hdr;
406 u16 optlen;
407
408 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
409 break;
410
411 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
412 if (nexthdr == NEXTHDR_FRAGMENT) {
413 optlen = 8;
414 } else if (nexthdr == NEXTHDR_AUTH) {
415 optlen = ipv6_authlen(hdr);
416 } else {
417 optlen = ipv6_optlen(hdr);
418 }
419
420 if (!pskb_may_pull(skb, off + optlen))
421 break;
422
423 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
424 if (nexthdr == NEXTHDR_FRAGMENT) {
425 struct frag_hdr *frag_hdr = (struct frag_hdr *)hdr;
426
427 if (frag_hdr->frag_off)
428 break;
429 }
430 if (nexthdr == NEXTHDR_DEST) {
431 u16 i = 2;
432
433 while (1) {
434 struct ipv6_tlv_tnl_enc_lim *tel;
435
436 /* No more room for encapsulation limit */
437 if (i + sizeof(*tel) > optlen)
438 break;
439
440 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
441 /* return index of option if found and valid */
442 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
443 tel->length == 1)
444 return i + off - nhoff;
445 /* else jump to next option */
446 if (tel->type)
447 i += tel->length + 2;
448 else
449 i++;
450 }
451 }
452 nexthdr = hdr->nexthdr;
453 off += optlen;
454 }
455 return 0;
456 }
457 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
458
459 /* ip6_tnl_err() should handle errors in the tunnel according to the
460 * specifications in RFC 2473.
461 */
462 static int
ip6_tnl_err(struct sk_buff * skb,__u8 ipproto,struct inet6_skb_parm * opt,u8 * type,u8 * code,int * msg,__u32 * info,int offset)463 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
464 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
465 {
466 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
467 struct net *net = dev_net(skb->dev);
468 u8 rel_type = ICMPV6_DEST_UNREACH;
469 u8 rel_code = ICMPV6_ADDR_UNREACH;
470 __u32 rel_info = 0;
471 struct ip6_tnl *t;
472 int err = -ENOENT;
473 int rel_msg = 0;
474 u8 tproto;
475 __u16 len;
476
477 /* If the packet doesn't contain the original IPv6 header we are
478 in trouble since we might need the source address for further
479 processing of the error. */
480
481 rcu_read_lock();
482 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
483 if (!t)
484 goto out;
485
486 tproto = READ_ONCE(t->parms.proto);
487 if (tproto != ipproto && tproto != 0)
488 goto out;
489
490 err = 0;
491
492 switch (*type) {
493 case ICMPV6_DEST_UNREACH:
494 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
495 t->parms.name);
496 rel_msg = 1;
497 break;
498 case ICMPV6_TIME_EXCEED:
499 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
500 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
501 t->parms.name);
502 rel_msg = 1;
503 }
504 break;
505 case ICMPV6_PARAMPROB: {
506 struct ipv6_tlv_tnl_enc_lim *tel;
507 __u32 teli;
508
509 teli = 0;
510 if ((*code) == ICMPV6_HDR_FIELD)
511 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
512
513 if (teli && teli == *info - 2) {
514 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
515 if (tel->encap_limit == 0) {
516 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
517 t->parms.name);
518 rel_msg = 1;
519 }
520 } else {
521 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
522 t->parms.name);
523 }
524 break;
525 }
526 case ICMPV6_PKT_TOOBIG: {
527 __u32 mtu;
528
529 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
530 sock_net_uid(net, NULL));
531 mtu = *info - offset;
532 if (mtu < IPV6_MIN_MTU)
533 mtu = IPV6_MIN_MTU;
534 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
535 if (len > mtu) {
536 rel_type = ICMPV6_PKT_TOOBIG;
537 rel_code = 0;
538 rel_info = mtu;
539 rel_msg = 1;
540 }
541 break;
542 }
543 case NDISC_REDIRECT:
544 ip6_redirect(skb, net, skb->dev->ifindex, 0,
545 sock_net_uid(net, NULL));
546 break;
547 }
548
549 *type = rel_type;
550 *code = rel_code;
551 *info = rel_info;
552 *msg = rel_msg;
553
554 out:
555 rcu_read_unlock();
556 return err;
557 }
558
559 static int
ip4ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)560 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
561 u8 type, u8 code, int offset, __be32 info)
562 {
563 __u32 rel_info = ntohl(info);
564 const struct iphdr *eiph;
565 struct sk_buff *skb2;
566 int err, rel_msg = 0;
567 u8 rel_type = type;
568 u8 rel_code = code;
569 struct rtable *rt;
570 struct flowi4 fl4;
571
572 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
573 &rel_msg, &rel_info, offset);
574 if (err < 0)
575 return err;
576
577 if (rel_msg == 0)
578 return 0;
579
580 switch (rel_type) {
581 case ICMPV6_DEST_UNREACH:
582 if (rel_code != ICMPV6_ADDR_UNREACH)
583 return 0;
584 rel_type = ICMP_DEST_UNREACH;
585 rel_code = ICMP_HOST_UNREACH;
586 break;
587 case ICMPV6_PKT_TOOBIG:
588 if (rel_code != 0)
589 return 0;
590 rel_type = ICMP_DEST_UNREACH;
591 rel_code = ICMP_FRAG_NEEDED;
592 break;
593 default:
594 return 0;
595 }
596
597 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
598 return 0;
599
600 skb2 = skb_clone(skb, GFP_ATOMIC);
601 if (!skb2)
602 return 0;
603
604 /* Remove debris left by IPv6 stack. */
605 memset(IPCB(skb2), 0, sizeof(*IPCB(skb2)));
606
607 skb_dst_drop(skb2);
608
609 skb_pull(skb2, offset);
610 skb_reset_network_header(skb2);
611 eiph = ip_hdr(skb2);
612 if (eiph->version != 4 || eiph->ihl < 5)
613 goto out;
614
615 /* Try to guess incoming interface */
616 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
617 0, 0, 0, IPPROTO_IPIP,
618 eiph->tos & INET_DSCP_MASK, 0);
619 if (IS_ERR(rt))
620 goto out;
621
622 skb2->dev = rt->dst.dev;
623 ip_rt_put(rt);
624
625 /* route "incoming" packet */
626 if (rt->rt_flags & RTCF_LOCAL) {
627 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
628 eiph->daddr, eiph->saddr, 0, 0,
629 IPPROTO_IPIP,
630 eiph->tos & INET_DSCP_MASK, 0);
631 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
632 if (!IS_ERR(rt))
633 ip_rt_put(rt);
634 goto out;
635 }
636 skb_dst_set(skb2, &rt->dst);
637 } else {
638 if (ip_route_input(skb2, eiph->daddr, eiph->saddr,
639 ip4h_dscp(eiph), skb2->dev) ||
640 skb_dst_dev(skb2)->type != ARPHRD_TUNNEL6)
641 goto out;
642 }
643
644 /* change mtu on this route */
645 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
646 if (rel_info > dst6_mtu(skb_dst(skb2)))
647 goto out;
648
649 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
650 }
651
652 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
653
654 out:
655 kfree_skb(skb2);
656 return 0;
657 }
658
659 static int
ip6ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)660 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
661 u8 type, u8 code, int offset, __be32 info)
662 {
663 __u32 rel_info = ntohl(info);
664 int err, rel_msg = 0;
665 u8 rel_type = type;
666 u8 rel_code = code;
667
668 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
669 &rel_msg, &rel_info, offset);
670 if (err < 0)
671 return err;
672
673 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
674 struct rt6_info *rt;
675 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
676
677 if (!skb2)
678 return 0;
679
680 skb_dst_drop(skb2);
681 skb_pull(skb2, offset);
682 skb_reset_network_header(skb2);
683
684 /* Try to guess incoming interface */
685 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
686 NULL, 0, skb2, 0);
687
688 if (rt && rt->dst.dev)
689 skb2->dev = rt->dst.dev;
690
691 icmpv6_send(skb2, rel_type, rel_code, rel_info);
692
693 ip6_rt_put(rt);
694
695 kfree_skb(skb2);
696 }
697
698 return 0;
699 }
700
701 static int
mplsip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)702 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
703 u8 type, u8 code, int offset, __be32 info)
704 {
705 __u32 rel_info = ntohl(info);
706 int err, rel_msg = 0;
707 u8 rel_type = type;
708 u8 rel_code = code;
709
710 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
711 &rel_msg, &rel_info, offset);
712 return err;
713 }
714
ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)715 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
716 const struct ipv6hdr *ipv6h,
717 struct sk_buff *skb)
718 {
719 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
720
721 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
722 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
723
724 return IP6_ECN_decapsulate(ipv6h, skb);
725 }
726
ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)727 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
728 const struct ipv6hdr *ipv6h,
729 struct sk_buff *skb)
730 {
731 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
732 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
733
734 return IP6_ECN_decapsulate(ipv6h, skb);
735 }
736
mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)737 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
738 const struct ipv6hdr *ipv6h,
739 struct sk_buff *skb)
740 {
741 /* ECN is not supported in AF_MPLS */
742 return 0;
743 }
744
ip6_tnl_get_cap(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)745 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
746 const struct in6_addr *laddr,
747 const struct in6_addr *raddr)
748 {
749 struct __ip6_tnl_parm *p = &t->parms;
750 int ltype = ipv6_addr_type(laddr);
751 int rtype = ipv6_addr_type(raddr);
752 __u32 flags = 0;
753
754 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
755 flags = IP6_TNL_F_CAP_PER_PACKET;
756 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
757 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
758 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
759 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
760 if (ltype&IPV6_ADDR_UNICAST)
761 flags |= IP6_TNL_F_CAP_XMIT;
762 if (rtype&IPV6_ADDR_UNICAST)
763 flags |= IP6_TNL_F_CAP_RCV;
764 }
765 return flags;
766 }
767 EXPORT_SYMBOL(ip6_tnl_get_cap);
768
769 /* called with rcu_read_lock() */
ip6_tnl_rcv_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)770 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
771 const struct in6_addr *laddr,
772 const struct in6_addr *raddr)
773 {
774 struct __ip6_tnl_parm *p = &t->parms;
775 int ret = 0;
776 struct net *net = t->net;
777
778 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
779 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
780 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
781 struct net_device *ldev = NULL;
782
783 if (p->link)
784 ldev = dev_get_by_index_rcu(net, p->link);
785
786 if ((ipv6_addr_is_multicast(laddr) ||
787 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
788 0, IFA_F_TENTATIVE))) &&
789 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
790 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
791 0, IFA_F_TENTATIVE))))
792 ret = 1;
793 }
794 return ret;
795 }
796 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
797
__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)798 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
799 const struct tnl_ptk_info *tpi,
800 struct metadata_dst *tun_dst,
801 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
802 const struct ipv6hdr *ipv6h,
803 struct sk_buff *skb),
804 bool log_ecn_err)
805 {
806 const struct ipv6hdr *ipv6h;
807 int nh, err;
808
809 if (test_bit(IP_TUNNEL_CSUM_BIT, tunnel->parms.i_flags) !=
810 test_bit(IP_TUNNEL_CSUM_BIT, tpi->flags)) {
811 DEV_STATS_INC(tunnel->dev, rx_crc_errors);
812 DEV_STATS_INC(tunnel->dev, rx_errors);
813 goto drop;
814 }
815
816 if (test_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.i_flags)) {
817 if (!test_bit(IP_TUNNEL_SEQ_BIT, tpi->flags) ||
818 (tunnel->i_seqno &&
819 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
820 DEV_STATS_INC(tunnel->dev, rx_fifo_errors);
821 DEV_STATS_INC(tunnel->dev, rx_errors);
822 goto drop;
823 }
824 tunnel->i_seqno = ntohl(tpi->seq) + 1;
825 }
826
827 skb->protocol = tpi->proto;
828
829 /* Warning: All skb pointers will be invalidated! */
830 if (tunnel->dev->type == ARPHRD_ETHER) {
831 if (!pskb_may_pull(skb, ETH_HLEN)) {
832 DEV_STATS_INC(tunnel->dev, rx_length_errors);
833 DEV_STATS_INC(tunnel->dev, rx_errors);
834 goto drop;
835 }
836
837 skb->protocol = eth_type_trans(skb, tunnel->dev);
838 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
839 } else {
840 skb->dev = tunnel->dev;
841 skb_reset_mac_header(skb);
842 }
843
844 /* Save offset of outer header relative to skb->head,
845 * because we are going to reset the network header to the inner header
846 * and might change skb->head.
847 */
848 nh = skb_network_header(skb) - skb->head;
849
850 skb_reset_network_header(skb);
851
852 if (skb_vlan_inet_prepare(skb, true)) {
853 DEV_STATS_INC(tunnel->dev, rx_length_errors);
854 DEV_STATS_INC(tunnel->dev, rx_errors);
855 goto drop;
856 }
857
858 /* Get the outer header. */
859 ipv6h = (struct ipv6hdr *)(skb->head + nh);
860
861 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
862
863 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
864
865 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
866 if (unlikely(err)) {
867 if (log_ecn_err)
868 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
869 &ipv6h->saddr,
870 ipv6_get_dsfield(ipv6h));
871 if (err > 1) {
872 DEV_STATS_INC(tunnel->dev, rx_frame_errors);
873 DEV_STATS_INC(tunnel->dev, rx_errors);
874 goto drop;
875 }
876 }
877
878 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
879
880 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
881
882 if (tun_dst)
883 skb_dst_set(skb, (struct dst_entry *)tun_dst);
884
885 gro_cells_receive(&tunnel->gro_cells, skb);
886 return 0;
887
888 drop:
889 if (tun_dst)
890 dst_release((struct dst_entry *)tun_dst);
891 kfree_skb(skb);
892 return 0;
893 }
894
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)895 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
896 const struct tnl_ptk_info *tpi,
897 struct metadata_dst *tun_dst,
898 bool log_ecn_err)
899 {
900 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
901 const struct ipv6hdr *ipv6h,
902 struct sk_buff *skb);
903
904 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
905 if (tpi->proto == htons(ETH_P_IP))
906 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
907
908 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
909 log_ecn_err);
910 }
911 EXPORT_SYMBOL(ip6_tnl_rcv);
912
913 static const struct tnl_ptk_info tpi_v6 = {
914 /* no tunnel info required for ipxip6. */
915 .proto = htons(ETH_P_IPV6),
916 };
917
918 static const struct tnl_ptk_info tpi_v4 = {
919 /* no tunnel info required for ipxip6. */
920 .proto = htons(ETH_P_IP),
921 };
922
923 static const struct tnl_ptk_info tpi_mpls = {
924 /* no tunnel info required for mplsip6. */
925 .proto = htons(ETH_P_MPLS_UC),
926 };
927
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))928 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
929 const struct tnl_ptk_info *tpi,
930 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
931 const struct ipv6hdr *ipv6h,
932 struct sk_buff *skb))
933 {
934 struct ip6_tnl *t;
935 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
936 struct metadata_dst *tun_dst = NULL;
937 int ret = -1;
938
939 rcu_read_lock();
940 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
941
942 if (t) {
943 u8 tproto = READ_ONCE(t->parms.proto);
944
945 if (tproto != ipproto && tproto != 0)
946 goto drop;
947 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
948 goto drop;
949 ipv6h = ipv6_hdr(skb);
950 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
951 goto drop;
952 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
953 goto drop;
954 if (t->parms.collect_md) {
955 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
956
957 tun_dst = ipv6_tun_rx_dst(skb, flags, 0, 0);
958 if (!tun_dst)
959 goto drop;
960 }
961 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
962 log_ecn_error);
963 }
964
965 rcu_read_unlock();
966
967 return ret;
968
969 drop:
970 rcu_read_unlock();
971 kfree_skb(skb);
972 return 0;
973 }
974
ip4ip6_rcv(struct sk_buff * skb)975 static int ip4ip6_rcv(struct sk_buff *skb)
976 {
977 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
978 ip4ip6_dscp_ecn_decapsulate);
979 }
980
ip6ip6_rcv(struct sk_buff * skb)981 static int ip6ip6_rcv(struct sk_buff *skb)
982 {
983 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
984 ip6ip6_dscp_ecn_decapsulate);
985 }
986
mplsip6_rcv(struct sk_buff * skb)987 static int mplsip6_rcv(struct sk_buff *skb)
988 {
989 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
990 mplsip6_dscp_ecn_decapsulate);
991 }
992
993 struct ipv6_tel_txoption {
994 struct ipv6_txoptions ops;
995 __u8 dst_opt[8];
996 };
997
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)998 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
999 {
1000 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
1001
1002 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
1003 opt->dst_opt[3] = 1;
1004 opt->dst_opt[4] = encap_limit;
1005 opt->dst_opt[5] = IPV6_TLV_PADN;
1006 opt->dst_opt[6] = 1;
1007
1008 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1009 opt->ops.opt_nflen = 8;
1010 }
1011
1012 /**
1013 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1014 * @t: the outgoing tunnel device
1015 * @hdr: IPv6 header from the incoming packet
1016 *
1017 * Description:
1018 * Avoid trivial tunneling loop by checking that tunnel exit-point
1019 * doesn't match source of incoming packet.
1020 *
1021 * Return:
1022 * 1 if conflict,
1023 * 0 else
1024 **/
1025
1026 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1027 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1028 {
1029 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1030 }
1031
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1032 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1033 const struct in6_addr *laddr,
1034 const struct in6_addr *raddr)
1035 {
1036 struct __ip6_tnl_parm *p = &t->parms;
1037 int ret = 0;
1038 struct net *net = t->net;
1039
1040 if (t->parms.collect_md)
1041 return 1;
1042
1043 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1044 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1045 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1046 struct net_device *ldev = NULL;
1047
1048 rcu_read_lock();
1049 if (p->link)
1050 ldev = dev_get_by_index_rcu(net, p->link);
1051
1052 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1053 0, IFA_F_TENTATIVE)))
1054 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1055 p->name);
1056 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1057 !ipv6_addr_is_multicast(raddr) &&
1058 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1059 true, 0, IFA_F_TENTATIVE)))
1060 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1061 p->name);
1062 else
1063 ret = 1;
1064 rcu_read_unlock();
1065 }
1066 return ret;
1067 }
1068 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1069
1070 /**
1071 * ip6_tnl_xmit - encapsulate packet and send
1072 * @skb: the outgoing socket buffer
1073 * @dev: the outgoing tunnel device
1074 * @dsfield: dscp code for outer header
1075 * @fl6: flow of tunneled packet
1076 * @encap_limit: encapsulation limit
1077 * @pmtu: Path MTU is stored if packet is too big
1078 * @proto: next header value
1079 *
1080 * Description:
1081 * Build new header and do some sanity checks on the packet before sending
1082 * it.
1083 *
1084 * Return:
1085 * 0 on success
1086 * -1 fail
1087 * %-EMSGSIZE message too big. return mtu in this case.
1088 **/
1089
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1090 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1091 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1092 __u8 proto)
1093 {
1094 struct ip6_tnl *t = netdev_priv(dev);
1095 struct net *net = t->net;
1096 struct ipv6hdr *ipv6h;
1097 struct ipv6_tel_txoption opt;
1098 struct dst_entry *dst = NULL, *ndst = NULL;
1099 struct net_device *tdev;
1100 int mtu;
1101 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1102 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1103 unsigned int max_headroom = psh_hlen;
1104 __be16 payload_protocol;
1105 bool use_cache = false;
1106 u8 hop_limit;
1107 int err = -1;
1108
1109 payload_protocol = skb_protocol(skb, true);
1110
1111 if (t->parms.collect_md) {
1112 hop_limit = skb_tunnel_info(skb)->key.ttl;
1113 goto route_lookup;
1114 } else {
1115 hop_limit = t->parms.hop_limit;
1116 }
1117
1118 /* NBMA tunnel */
1119 if (ipv6_addr_any(&t->parms.raddr)) {
1120 if (payload_protocol == htons(ETH_P_IPV6)) {
1121 struct in6_addr *addr6;
1122 struct neighbour *neigh;
1123 int addr_type;
1124
1125 if (!skb_dst(skb))
1126 goto tx_err_link_failure;
1127
1128 neigh = dst_neigh_lookup(skb_dst(skb),
1129 &ipv6_hdr(skb)->daddr);
1130 if (!neigh)
1131 goto tx_err_link_failure;
1132
1133 addr6 = (struct in6_addr *)&neigh->primary_key;
1134 addr_type = ipv6_addr_type(addr6);
1135
1136 if (addr_type == IPV6_ADDR_ANY)
1137 addr6 = &ipv6_hdr(skb)->daddr;
1138
1139 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1140 neigh_release(neigh);
1141 } else if (payload_protocol == htons(ETH_P_IP)) {
1142 const struct rtable *rt = skb_rtable(skb);
1143
1144 if (!rt)
1145 goto tx_err_link_failure;
1146
1147 if (rt->rt_gw_family == AF_INET6)
1148 memcpy(&fl6->daddr, &rt->rt_gw6, sizeof(fl6->daddr));
1149 }
1150 } else if (t->parms.proto != 0 && !(t->parms.flags &
1151 (IP6_TNL_F_USE_ORIG_TCLASS |
1152 IP6_TNL_F_USE_ORIG_FWMARK))) {
1153 /* enable the cache only if neither the outer protocol nor the
1154 * routing decision depends on the current inner header value
1155 */
1156 use_cache = true;
1157 }
1158
1159 if (use_cache)
1160 dst = dst_cache_get(&t->dst_cache);
1161
1162 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1163 goto tx_err_link_failure;
1164
1165 if (!dst) {
1166 route_lookup:
1167 /* add dsfield to flowlabel for route lookup */
1168 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1169
1170 dst = ip6_route_output(net, NULL, fl6);
1171
1172 if (dst->error)
1173 goto tx_err_link_failure;
1174 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1175 if (IS_ERR(dst)) {
1176 err = PTR_ERR(dst);
1177 dst = NULL;
1178 goto tx_err_link_failure;
1179 }
1180 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1181 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1182 &fl6->daddr, 0, &fl6->saddr))
1183 goto tx_err_link_failure;
1184 ndst = dst;
1185 }
1186
1187 tdev = dst_dev(dst);
1188
1189 if (tdev == dev) {
1190 DEV_STATS_INC(dev, collisions);
1191 net_warn_ratelimited("%s: Local routing loop detected!\n",
1192 t->parms.name);
1193 goto tx_err_dst_release;
1194 }
1195 mtu = dst6_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1196 if (encap_limit >= 0) {
1197 max_headroom += 8;
1198 mtu -= 8;
1199 }
1200 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1201 IPV6_MIN_MTU : IPV4_MIN_MTU);
1202
1203 skb_dst_update_pmtu_no_confirm(skb, mtu);
1204 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1205 *pmtu = mtu;
1206 err = -EMSGSIZE;
1207 goto tx_err_dst_release;
1208 }
1209
1210 if (t->err_count > 0) {
1211 if (time_before(jiffies,
1212 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1213 t->err_count--;
1214
1215 dst_link_failure(skb);
1216 } else {
1217 t->err_count = 0;
1218 }
1219 }
1220
1221 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1222
1223 /*
1224 * Okay, now see if we can stuff it in the buffer as-is.
1225 */
1226 max_headroom += LL_RESERVED_SPACE(tdev);
1227
1228 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1229 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1230 struct sk_buff *new_skb;
1231
1232 new_skb = skb_realloc_headroom(skb, max_headroom);
1233 if (!new_skb)
1234 goto tx_err_dst_release;
1235
1236 if (skb->sk)
1237 skb_set_owner_w(new_skb, skb->sk);
1238 consume_skb(skb);
1239 skb = new_skb;
1240 }
1241
1242 if (t->parms.collect_md) {
1243 if (t->encap.type != TUNNEL_ENCAP_NONE)
1244 goto tx_err_dst_release;
1245 } else {
1246 if (use_cache && ndst)
1247 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1248 }
1249 skb_dst_set(skb, dst);
1250
1251 if (hop_limit == 0) {
1252 if (payload_protocol == htons(ETH_P_IP))
1253 hop_limit = ip_hdr(skb)->ttl;
1254 else if (payload_protocol == htons(ETH_P_IPV6))
1255 hop_limit = ipv6_hdr(skb)->hop_limit;
1256 else
1257 hop_limit = ip6_dst_hoplimit(dst);
1258 }
1259
1260 /* Calculate max headroom for all the headers and adjust
1261 * needed_headroom if necessary.
1262 */
1263 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr)
1264 + dst->header_len + t->hlen;
1265 ip_tunnel_adj_headroom(dev, max_headroom);
1266
1267 err = ip6_tnl_encap(skb, t, &proto, fl6);
1268 if (err)
1269 return err;
1270
1271 if (encap_limit >= 0) {
1272 init_tel_txopt(&opt, encap_limit);
1273 proto = ipv6_push_frag_opts(skb, &opt.ops, proto);
1274 }
1275
1276 skb_push(skb, sizeof(struct ipv6hdr));
1277 skb_reset_network_header(skb);
1278 ipv6h = ipv6_hdr(skb);
1279 ip6_flow_hdr(ipv6h, dsfield,
1280 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1281 ipv6h->hop_limit = hop_limit;
1282 ipv6h->nexthdr = proto;
1283 ipv6h->saddr = fl6->saddr;
1284 ipv6h->daddr = fl6->daddr;
1285 ip6tunnel_xmit(NULL, skb, dev, 0);
1286 return 0;
1287 tx_err_link_failure:
1288 DEV_STATS_INC(dev, tx_carrier_errors);
1289 dst_link_failure(skb);
1290 tx_err_dst_release:
1291 dst_release(dst);
1292 return err;
1293 }
1294 EXPORT_SYMBOL(ip6_tnl_xmit);
1295
1296 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1297 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1298 u8 protocol)
1299 {
1300 struct ip6_tnl *t = netdev_priv(dev);
1301 struct ipv6hdr *ipv6h;
1302 const struct iphdr *iph;
1303 int encap_limit = -1;
1304 __u16 offset;
1305 struct flowi6 fl6;
1306 __u8 dsfield, orig_dsfield;
1307 __u32 mtu;
1308 u8 tproto;
1309 int err;
1310
1311 tproto = READ_ONCE(t->parms.proto);
1312 if (tproto != protocol && tproto != 0)
1313 return -1;
1314
1315 if (t->parms.collect_md) {
1316 struct ip_tunnel_info *tun_info;
1317 const struct ip_tunnel_key *key;
1318
1319 tun_info = skb_tunnel_info(skb);
1320 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1321 ip_tunnel_info_af(tun_info) != AF_INET6))
1322 return -1;
1323 key = &tun_info->key;
1324 memset(&fl6, 0, sizeof(fl6));
1325 fl6.flowi6_proto = protocol;
1326 fl6.saddr = key->u.ipv6.src;
1327 fl6.daddr = key->u.ipv6.dst;
1328 fl6.flowlabel = key->label;
1329 dsfield = key->tos;
1330 switch (protocol) {
1331 case IPPROTO_IPIP:
1332 iph = ip_hdr(skb);
1333 orig_dsfield = ipv4_get_dsfield(iph);
1334 break;
1335 case IPPROTO_IPV6:
1336 ipv6h = ipv6_hdr(skb);
1337 orig_dsfield = ipv6_get_dsfield(ipv6h);
1338 break;
1339 default:
1340 orig_dsfield = dsfield;
1341 break;
1342 }
1343 } else {
1344 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1345 encap_limit = t->parms.encap_limit;
1346 if (protocol == IPPROTO_IPV6) {
1347 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1348 skb_network_header(skb));
1349 /* ip6_tnl_parse_tlv_enc_lim() might have
1350 * reallocated skb->head
1351 */
1352 if (offset > 0) {
1353 struct ipv6_tlv_tnl_enc_lim *tel;
1354
1355 tel = (void *)&skb_network_header(skb)[offset];
1356 if (tel->encap_limit == 0) {
1357 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1358 ICMPV6_HDR_FIELD, offset + 2);
1359 return -1;
1360 }
1361 encap_limit = tel->encap_limit - 1;
1362 }
1363 }
1364
1365 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1366 fl6.flowi6_proto = protocol;
1367
1368 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1369 fl6.flowi6_mark = skb->mark;
1370 else
1371 fl6.flowi6_mark = t->parms.fwmark;
1372 switch (protocol) {
1373 case IPPROTO_IPIP:
1374 iph = ip_hdr(skb);
1375 orig_dsfield = ipv4_get_dsfield(iph);
1376 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1377 dsfield = orig_dsfield;
1378 else
1379 dsfield = ip6_tclass(t->parms.flowinfo);
1380 break;
1381 case IPPROTO_IPV6:
1382 ipv6h = ipv6_hdr(skb);
1383 orig_dsfield = ipv6_get_dsfield(ipv6h);
1384 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1385 dsfield = orig_dsfield;
1386 else
1387 dsfield = ip6_tclass(t->parms.flowinfo);
1388 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1389 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1390 break;
1391 default:
1392 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1393 break;
1394 }
1395 }
1396
1397 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1398 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1399
1400 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1401 return -1;
1402
1403 skb_set_inner_ipproto(skb, protocol);
1404
1405 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1406 protocol);
1407 if (err != 0) {
1408 /* XXX: send ICMP error even if DF is not set. */
1409 if (err == -EMSGSIZE)
1410 switch (protocol) {
1411 case IPPROTO_IPIP:
1412 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1413 ICMP_FRAG_NEEDED, htonl(mtu));
1414 break;
1415 case IPPROTO_IPV6:
1416 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1417 break;
1418 default:
1419 break;
1420 }
1421 return -1;
1422 }
1423
1424 return 0;
1425 }
1426
1427 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1428 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1429 {
1430 struct ip6_tnl *t = netdev_priv(dev);
1431 u8 ipproto;
1432 int ret;
1433
1434 if (!pskb_inet_may_pull(skb))
1435 goto tx_err;
1436
1437 switch (skb->protocol) {
1438 case htons(ETH_P_IP):
1439 ipproto = IPPROTO_IPIP;
1440 break;
1441 case htons(ETH_P_IPV6):
1442 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1443 goto tx_err;
1444 ipproto = IPPROTO_IPV6;
1445 break;
1446 case htons(ETH_P_MPLS_UC):
1447 ipproto = IPPROTO_MPLS;
1448 break;
1449 default:
1450 goto tx_err;
1451 }
1452
1453 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1454 if (ret < 0)
1455 goto tx_err;
1456
1457 return NETDEV_TX_OK;
1458
1459 tx_err:
1460 DEV_STATS_INC(dev, tx_errors);
1461 DEV_STATS_INC(dev, tx_dropped);
1462 kfree_skb(skb);
1463 return NETDEV_TX_OK;
1464 }
1465
ip6_tnl_link_config(struct ip6_tnl * t)1466 static void ip6_tnl_link_config(struct ip6_tnl *t)
1467 {
1468 struct net_device *dev = t->dev;
1469 struct net_device *tdev = NULL;
1470 struct __ip6_tnl_parm *p = &t->parms;
1471 struct flowi6 *fl6 = &t->fl.u.ip6;
1472 int t_hlen;
1473 int mtu;
1474
1475 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1476 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1477
1478 /* Set up flowi template */
1479 fl6->saddr = p->laddr;
1480 fl6->daddr = p->raddr;
1481 fl6->flowi6_oif = p->link;
1482 fl6->flowlabel = 0;
1483
1484 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1485 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1486 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1487 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1488
1489 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1490 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1491
1492 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1493 dev->flags |= IFF_POINTOPOINT;
1494 else
1495 dev->flags &= ~IFF_POINTOPOINT;
1496
1497 t->tun_hlen = 0;
1498 t->hlen = t->encap_hlen + t->tun_hlen;
1499 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1500
1501 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1502 int strict = (ipv6_addr_type(&p->raddr) &
1503 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1504
1505 struct rt6_info *rt = rt6_lookup(t->net,
1506 &p->raddr, &p->laddr,
1507 p->link, NULL, strict);
1508 if (rt) {
1509 tdev = rt->dst.dev;
1510 ip6_rt_put(rt);
1511 }
1512
1513 if (!tdev && p->link)
1514 tdev = __dev_get_by_index(t->net, p->link);
1515
1516 if (tdev) {
1517 dev->needed_headroom = tdev->hard_header_len +
1518 tdev->needed_headroom + t_hlen;
1519 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1520
1521 mtu = mtu - t_hlen;
1522 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1523 mtu -= 8;
1524
1525 if (mtu < IPV6_MIN_MTU)
1526 mtu = IPV6_MIN_MTU;
1527 WRITE_ONCE(dev->mtu, mtu);
1528 }
1529 }
1530 }
1531
1532 /**
1533 * ip6_tnl_change - update the tunnel parameters
1534 * @t: tunnel to be changed
1535 * @p: tunnel configuration parameters
1536 *
1537 * Description:
1538 * ip6_tnl_change() updates the tunnel parameters
1539 **/
1540
1541 static void
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1542 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1543 {
1544 t->parms.laddr = p->laddr;
1545 t->parms.raddr = p->raddr;
1546 t->parms.flags = p->flags;
1547 t->parms.hop_limit = p->hop_limit;
1548 t->parms.encap_limit = p->encap_limit;
1549 t->parms.flowinfo = p->flowinfo;
1550 t->parms.link = p->link;
1551 t->parms.proto = p->proto;
1552 t->parms.fwmark = p->fwmark;
1553 dst_cache_reset(&t->dst_cache);
1554 ip6_tnl_link_config(t);
1555 }
1556
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1557 static void ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1558 {
1559 struct net *net = t->net;
1560 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1561
1562 ip6_tnl_unlink(ip6n, t);
1563 synchronize_net();
1564 ip6_tnl_change(t, p);
1565 ip6_tnl_link(ip6n, t);
1566 netdev_state_change(t->dev);
1567 }
1568
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p,bool strict)1569 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
1570 bool strict)
1571 {
1572 /* For the default ip6tnl0 device, allow changing only the protocol
1573 * (the IP6_TNL_F_CAP_PER_PACKET flag is set on ip6tnl0, and all other
1574 * parameters are 0).
1575 */
1576 if (strict &&
1577 (!ipv6_addr_any(&p->laddr) || !ipv6_addr_any(&p->raddr) ||
1578 p->flags != t->parms.flags || p->hop_limit || p->encap_limit ||
1579 p->flowinfo || p->link || p->fwmark || p->collect_md))
1580 return -EINVAL;
1581
1582 t->parms.proto = p->proto;
1583 netdev_state_change(t->dev);
1584 return 0;
1585 }
1586
1587 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1588 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1589 {
1590 p->laddr = u->laddr;
1591 p->raddr = u->raddr;
1592 p->flags = u->flags;
1593 p->hop_limit = u->hop_limit;
1594 p->encap_limit = u->encap_limit;
1595 p->flowinfo = u->flowinfo;
1596 p->link = u->link;
1597 p->proto = u->proto;
1598 memcpy(p->name, u->name, sizeof(u->name));
1599 }
1600
1601 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1602 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1603 {
1604 u->laddr = p->laddr;
1605 u->raddr = p->raddr;
1606 u->flags = p->flags;
1607 u->hop_limit = p->hop_limit;
1608 u->encap_limit = p->encap_limit;
1609 u->flowinfo = p->flowinfo;
1610 u->link = p->link;
1611 u->proto = p->proto;
1612 memcpy(u->name, p->name, sizeof(u->name));
1613 }
1614
1615 /**
1616 * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace
1617 * @dev: virtual device associated with tunnel
1618 * @ifr: unused
1619 * @data: parameters passed from userspace
1620 * @cmd: command to be performed
1621 *
1622 * Description:
1623 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1624 * from userspace.
1625 *
1626 * The possible commands are the following:
1627 * %SIOCGETTUNNEL: get tunnel parameters for device
1628 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1629 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1630 * %SIOCDELTUNNEL: delete tunnel
1631 *
1632 * The fallback device "ip6tnl0", created during module
1633 * initialization, can be used for creating other tunnel devices.
1634 *
1635 * Return:
1636 * 0 on success,
1637 * %-EFAULT if unable to copy data to or from userspace,
1638 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1639 * %-EINVAL if passed tunnel parameters are invalid,
1640 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1641 * %-ENODEV if attempting to change or delete a nonexisting device
1642 **/
1643
1644 static int
ip6_tnl_siocdevprivate(struct net_device * dev,struct ifreq * ifr,void __user * data,int cmd)1645 ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1646 void __user *data, int cmd)
1647 {
1648 int err = 0;
1649 struct ip6_tnl_parm p;
1650 struct __ip6_tnl_parm p1;
1651 struct ip6_tnl *t = netdev_priv(dev);
1652 struct net *net = t->net;
1653 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1654
1655 memset(&p1, 0, sizeof(p1));
1656
1657 switch (cmd) {
1658 case SIOCGETTUNNEL:
1659 if (dev == ip6n->fb_tnl_dev) {
1660 if (copy_from_user(&p, data, sizeof(p))) {
1661 err = -EFAULT;
1662 break;
1663 }
1664 ip6_tnl_parm_from_user(&p1, &p);
1665 t = ip6_tnl_locate(net, &p1, 0);
1666 if (IS_ERR(t))
1667 t = netdev_priv(dev);
1668 } else {
1669 memset(&p, 0, sizeof(p));
1670 }
1671 ip6_tnl_parm_to_user(&p, &t->parms);
1672 if (copy_to_user(data, &p, sizeof(p)))
1673 err = -EFAULT;
1674 break;
1675 case SIOCADDTUNNEL:
1676 case SIOCCHGTUNNEL:
1677 err = -EPERM;
1678 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1679 break;
1680 err = -EFAULT;
1681 if (copy_from_user(&p, data, sizeof(p)))
1682 break;
1683 err = -EINVAL;
1684 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1685 p.proto != 0)
1686 break;
1687 ip6_tnl_parm_from_user(&p1, &p);
1688 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1689 if (cmd == SIOCCHGTUNNEL) {
1690 if (!IS_ERR(t)) {
1691 if (t->dev != dev) {
1692 err = -EEXIST;
1693 break;
1694 }
1695 } else
1696 t = netdev_priv(dev);
1697 if (dev == ip6n->fb_tnl_dev)
1698 ip6_tnl0_update(t, &p1, false);
1699 else
1700 ip6_tnl_update(t, &p1);
1701 }
1702 if (!IS_ERR(t)) {
1703 err = 0;
1704 ip6_tnl_parm_to_user(&p, &t->parms);
1705 if (copy_to_user(data, &p, sizeof(p)))
1706 err = -EFAULT;
1707
1708 } else {
1709 err = PTR_ERR(t);
1710 }
1711 break;
1712 case SIOCDELTUNNEL:
1713 err = -EPERM;
1714 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1715 break;
1716
1717 if (dev == ip6n->fb_tnl_dev) {
1718 err = -EFAULT;
1719 if (copy_from_user(&p, data, sizeof(p)))
1720 break;
1721 err = -ENOENT;
1722 ip6_tnl_parm_from_user(&p1, &p);
1723 t = ip6_tnl_locate(net, &p1, 0);
1724 if (IS_ERR(t))
1725 break;
1726 err = -EPERM;
1727 if (t->dev == ip6n->fb_tnl_dev)
1728 break;
1729 dev = t->dev;
1730 }
1731 err = 0;
1732 unregister_netdevice(dev);
1733 break;
1734 default:
1735 err = -EINVAL;
1736 }
1737 return err;
1738 }
1739
1740 /**
1741 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1742 * @dev: virtual device associated with tunnel
1743 * @new_mtu: the new mtu
1744 *
1745 * Return:
1746 * 0 on success,
1747 * %-EINVAL if mtu too small
1748 **/
1749
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1750 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1751 {
1752 struct ip6_tnl *tnl = netdev_priv(dev);
1753 int t_hlen;
1754
1755 t_hlen = tnl->hlen + sizeof(struct ipv6hdr);
1756 if (tnl->parms.proto == IPPROTO_IPV6) {
1757 if (new_mtu < IPV6_MIN_MTU)
1758 return -EINVAL;
1759 } else {
1760 if (new_mtu < ETH_MIN_MTU)
1761 return -EINVAL;
1762 }
1763 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1764 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len - t_hlen)
1765 return -EINVAL;
1766 } else {
1767 if (new_mtu > IP_MAX_MTU - dev->hard_header_len - t_hlen)
1768 return -EINVAL;
1769 }
1770 WRITE_ONCE(dev->mtu, new_mtu);
1771 return 0;
1772 }
1773 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1774
ip6_tnl_get_iflink(const struct net_device * dev)1775 int ip6_tnl_get_iflink(const struct net_device *dev)
1776 {
1777 struct ip6_tnl *t = netdev_priv(dev);
1778
1779 return READ_ONCE(t->parms.link);
1780 }
1781 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1782
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1783 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1784 unsigned int num)
1785 {
1786 if (num >= MAX_IPTUN_ENCAP_OPS)
1787 return -ERANGE;
1788
1789 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1790 &ip6tun_encaps[num],
1791 NULL, ops) ? 0 : -1;
1792 }
1793 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1794
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1795 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1796 unsigned int num)
1797 {
1798 int ret;
1799
1800 if (num >= MAX_IPTUN_ENCAP_OPS)
1801 return -ERANGE;
1802
1803 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1804 &ip6tun_encaps[num],
1805 ops, NULL) == ops) ? 0 : -1;
1806
1807 synchronize_net();
1808
1809 return ret;
1810 }
1811 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1812
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1813 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1814 struct ip_tunnel_encap *ipencap)
1815 {
1816 int hlen;
1817
1818 memset(&t->encap, 0, sizeof(t->encap));
1819
1820 hlen = ip6_encap_hlen(ipencap);
1821 if (hlen < 0)
1822 return hlen;
1823
1824 t->encap.type = ipencap->type;
1825 t->encap.sport = ipencap->sport;
1826 t->encap.dport = ipencap->dport;
1827 t->encap.flags = ipencap->flags;
1828
1829 t->encap_hlen = hlen;
1830 t->hlen = t->encap_hlen + t->tun_hlen;
1831
1832 return 0;
1833 }
1834 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1835
ip6_tnl_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)1836 static int ip6_tnl_fill_forward_path(struct net_device_path_ctx *ctx,
1837 struct net_device_path *path)
1838 {
1839 struct ip6_tnl *t = netdev_priv(ctx->dev);
1840 struct flowi6 fl6 = {
1841 .daddr = t->parms.raddr,
1842 };
1843 struct dst_entry *dst;
1844 int err;
1845
1846 dst = ip6_route_output(dev_net(ctx->dev), NULL, &fl6);
1847 if (!dst->error) {
1848 path->type = DEV_PATH_TUN;
1849 path->tun.src_v6 = t->parms.laddr;
1850 path->tun.dst_v6 = t->parms.raddr;
1851 path->tun.l3_proto = IPPROTO_IPV6;
1852 path->dev = ctx->dev;
1853 ctx->dev = dst->dev;
1854 }
1855
1856 err = dst->error;
1857 dst_release(dst);
1858
1859 return err;
1860 }
1861
1862 static const struct net_device_ops ip6_tnl_netdev_ops = {
1863 .ndo_init = ip6_tnl_dev_init,
1864 .ndo_uninit = ip6_tnl_dev_uninit,
1865 .ndo_start_xmit = ip6_tnl_start_xmit,
1866 .ndo_siocdevprivate = ip6_tnl_siocdevprivate,
1867 .ndo_change_mtu = ip6_tnl_change_mtu,
1868 .ndo_get_stats64 = dev_get_tstats64,
1869 .ndo_get_iflink = ip6_tnl_get_iflink,
1870 .ndo_fill_forward_path = ip6_tnl_fill_forward_path,
1871 };
1872
1873 #define IPXIPX_FEATURES (NETIF_F_SG | \
1874 NETIF_F_FRAGLIST | \
1875 NETIF_F_HIGHDMA | \
1876 NETIF_F_GSO_SOFTWARE | \
1877 NETIF_F_HW_CSUM)
1878
1879 /**
1880 * ip6_tnl_dev_setup - setup virtual tunnel device
1881 * @dev: virtual device associated with tunnel
1882 *
1883 * Description:
1884 * Initialize function pointers and device parameters
1885 **/
1886
ip6_tnl_dev_setup(struct net_device * dev)1887 static void ip6_tnl_dev_setup(struct net_device *dev)
1888 {
1889 dev->netdev_ops = &ip6_tnl_netdev_ops;
1890 dev->header_ops = &ip_tunnel_header_ops;
1891 dev->needs_free_netdev = true;
1892 dev->priv_destructor = ip6_dev_free;
1893
1894 dev->type = ARPHRD_TUNNEL6;
1895 dev->flags |= IFF_NOARP;
1896 dev->addr_len = sizeof(struct in6_addr);
1897 dev->lltx = true;
1898 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1899 netif_keep_dst(dev);
1900
1901 dev->features |= IPXIPX_FEATURES;
1902 dev->hw_features |= IPXIPX_FEATURES;
1903
1904 /* This perm addr will be used as interface identifier by IPv6 */
1905 dev->addr_assign_type = NET_ADDR_RANDOM;
1906 eth_random_addr(dev->perm_addr);
1907 }
1908
1909
1910 /**
1911 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1912 * @dev: virtual device associated with tunnel
1913 **/
1914
1915 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1916 ip6_tnl_dev_init_gen(struct net_device *dev)
1917 {
1918 struct ip6_tnl *t = netdev_priv(dev);
1919 int ret;
1920 int t_hlen;
1921
1922 t->dev = dev;
1923
1924 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1925 if (ret)
1926 return ret;
1927
1928 ret = gro_cells_init(&t->gro_cells, dev);
1929 if (ret)
1930 goto destroy_dst;
1931
1932 t->tun_hlen = 0;
1933 t->hlen = t->encap_hlen + t->tun_hlen;
1934 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1935
1936 dev->type = ARPHRD_TUNNEL6;
1937 dev->mtu = ETH_DATA_LEN - t_hlen;
1938 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1939 dev->mtu -= 8;
1940 dev->min_mtu = ETH_MIN_MTU;
1941 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len - t_hlen;
1942
1943 netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
1944 netdev_lockdep_set_classes(dev);
1945 return 0;
1946
1947 destroy_dst:
1948 dst_cache_destroy(&t->dst_cache);
1949
1950 return ret;
1951 }
1952
1953 /**
1954 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1955 * @dev: virtual device associated with tunnel
1956 **/
1957
ip6_tnl_dev_init(struct net_device * dev)1958 static int ip6_tnl_dev_init(struct net_device *dev)
1959 {
1960 struct ip6_tnl *t = netdev_priv(dev);
1961 int err = ip6_tnl_dev_init_gen(dev);
1962
1963 if (err)
1964 return err;
1965 ip6_tnl_link_config(t);
1966 if (t->parms.collect_md)
1967 netif_keep_dst(dev);
1968 return 0;
1969 }
1970
1971 /**
1972 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1973 * @dev: fallback device
1974 *
1975 * Return: 0
1976 **/
1977
ip6_fb_tnl_dev_init(struct net_device * dev)1978 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1979 {
1980 struct ip6_tnl *t = netdev_priv(dev);
1981 struct net *net = dev_net(dev);
1982 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1983
1984 t->net = net;
1985 t->parms.proto = IPPROTO_IPV6;
1986
1987 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1988 return 0;
1989 }
1990
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1991 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1992 struct netlink_ext_ack *extack)
1993 {
1994 u8 proto;
1995
1996 if (!data || !data[IFLA_IPTUN_PROTO])
1997 return 0;
1998
1999 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2000 if (proto != IPPROTO_IPV6 &&
2001 proto != IPPROTO_IPIP &&
2002 proto != 0)
2003 return -EINVAL;
2004
2005 return 0;
2006 }
2007
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)2008 static void ip6_tnl_netlink_parms(struct nlattr *data[],
2009 struct __ip6_tnl_parm *parms)
2010 {
2011 memset(parms, 0, sizeof(*parms));
2012
2013 if (!data)
2014 return;
2015
2016 if (data[IFLA_IPTUN_LINK])
2017 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
2018
2019 if (data[IFLA_IPTUN_LOCAL])
2020 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
2021
2022 if (data[IFLA_IPTUN_REMOTE])
2023 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
2024
2025 if (data[IFLA_IPTUN_TTL])
2026 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
2027
2028 if (data[IFLA_IPTUN_ENCAP_LIMIT])
2029 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
2030
2031 if (data[IFLA_IPTUN_FLOWINFO])
2032 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
2033
2034 if (data[IFLA_IPTUN_FLAGS])
2035 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
2036
2037 if (data[IFLA_IPTUN_PROTO])
2038 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2039
2040 if (data[IFLA_IPTUN_COLLECT_METADATA])
2041 parms->collect_md = true;
2042
2043 if (data[IFLA_IPTUN_FWMARK])
2044 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2045 }
2046
ip6_tnl_newlink(struct net_device * dev,struct rtnl_newlink_params * params,struct netlink_ext_ack * extack)2047 static int ip6_tnl_newlink(struct net_device *dev,
2048 struct rtnl_newlink_params *params,
2049 struct netlink_ext_ack *extack)
2050 {
2051 struct nlattr **data = params->data;
2052 struct nlattr **tb = params->tb;
2053 struct ip_tunnel_encap ipencap;
2054 struct ip6_tnl_net *ip6n;
2055 struct ip6_tnl *nt, *t;
2056 struct net *net;
2057 int err;
2058
2059 net = params->link_net ? : dev_net(dev);
2060 ip6n = net_generic(net, ip6_tnl_net_id);
2061 nt = netdev_priv(dev);
2062 nt->net = net;
2063
2064 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2065 err = ip6_tnl_encap_setup(nt, &ipencap);
2066 if (err < 0)
2067 return err;
2068 }
2069
2070 ip6_tnl_netlink_parms(data, &nt->parms);
2071
2072 if (nt->parms.collect_md) {
2073 if (rtnl_dereference(ip6n->collect_md_tun))
2074 return -EEXIST;
2075 } else {
2076 t = ip6_tnl_locate(net, &nt->parms, 0);
2077 if (!IS_ERR(t))
2078 return -EEXIST;
2079 }
2080
2081 err = ip6_tnl_create2(dev);
2082 if (!err && tb[IFLA_MTU])
2083 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2084
2085 return err;
2086 }
2087
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2088 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2089 struct nlattr *data[],
2090 struct netlink_ext_ack *extack)
2091 {
2092 struct ip6_tnl *t = netdev_priv(dev);
2093 struct __ip6_tnl_parm p;
2094 struct net *net = t->net;
2095 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2096 struct ip_tunnel_encap ipencap;
2097
2098 if (dev == ip6n->fb_tnl_dev) {
2099 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2100 /* iproute2 always sets TUNNEL_ENCAP_FLAG_CSUM6, so
2101 * let's ignore this flag.
2102 */
2103 ipencap.flags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
2104 if (memchr_inv(&ipencap, 0, sizeof(ipencap))) {
2105 NL_SET_ERR_MSG(extack,
2106 "Only protocol can be changed for fallback tunnel, not encap params");
2107 return -EINVAL;
2108 }
2109 }
2110
2111 ip6_tnl_netlink_parms(data, &p);
2112 if (ip6_tnl0_update(t, &p, true) < 0) {
2113 NL_SET_ERR_MSG(extack,
2114 "Only protocol can be changed for fallback tunnel");
2115 return -EINVAL;
2116 }
2117
2118 return 0;
2119 }
2120
2121 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2122 int err = ip6_tnl_encap_setup(t, &ipencap);
2123
2124 if (err < 0)
2125 return err;
2126 }
2127 ip6_tnl_netlink_parms(data, &p);
2128 if (p.collect_md)
2129 return -EINVAL;
2130
2131 t = ip6_tnl_locate(net, &p, 0);
2132 if (!IS_ERR(t)) {
2133 if (t->dev != dev)
2134 return -EEXIST;
2135 } else
2136 t = netdev_priv(dev);
2137
2138 ip6_tnl_update(t, &p);
2139 return 0;
2140 }
2141
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2142 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2143 {
2144 struct net *net = dev_net(dev);
2145 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2146
2147 if (dev != ip6n->fb_tnl_dev)
2148 unregister_netdevice_queue(dev, head);
2149 }
2150
ip6_tnl_get_size(const struct net_device * dev)2151 static size_t ip6_tnl_get_size(const struct net_device *dev)
2152 {
2153 return
2154 /* IFLA_IPTUN_LINK */
2155 nla_total_size(4) +
2156 /* IFLA_IPTUN_LOCAL */
2157 nla_total_size(sizeof(struct in6_addr)) +
2158 /* IFLA_IPTUN_REMOTE */
2159 nla_total_size(sizeof(struct in6_addr)) +
2160 /* IFLA_IPTUN_TTL */
2161 nla_total_size(1) +
2162 /* IFLA_IPTUN_ENCAP_LIMIT */
2163 nla_total_size(1) +
2164 /* IFLA_IPTUN_FLOWINFO */
2165 nla_total_size(4) +
2166 /* IFLA_IPTUN_FLAGS */
2167 nla_total_size(4) +
2168 /* IFLA_IPTUN_PROTO */
2169 nla_total_size(1) +
2170 /* IFLA_IPTUN_ENCAP_TYPE */
2171 nla_total_size(2) +
2172 /* IFLA_IPTUN_ENCAP_FLAGS */
2173 nla_total_size(2) +
2174 /* IFLA_IPTUN_ENCAP_SPORT */
2175 nla_total_size(2) +
2176 /* IFLA_IPTUN_ENCAP_DPORT */
2177 nla_total_size(2) +
2178 /* IFLA_IPTUN_COLLECT_METADATA */
2179 nla_total_size(0) +
2180 /* IFLA_IPTUN_FWMARK */
2181 nla_total_size(4) +
2182 0;
2183 }
2184
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2185 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2186 {
2187 struct ip6_tnl *tunnel = netdev_priv(dev);
2188 struct __ip6_tnl_parm *parm = &tunnel->parms;
2189
2190 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2191 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2192 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2193 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2194 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2195 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2196 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2197 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2198 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2199 goto nla_put_failure;
2200
2201 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2202 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2203 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2204 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2205 goto nla_put_failure;
2206
2207 if (parm->collect_md)
2208 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2209 goto nla_put_failure;
2210
2211 return 0;
2212
2213 nla_put_failure:
2214 return -EMSGSIZE;
2215 }
2216
ip6_tnl_get_link_net(const struct net_device * dev)2217 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2218 {
2219 struct ip6_tnl *tunnel = netdev_priv(dev);
2220
2221 return READ_ONCE(tunnel->net);
2222 }
2223 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2224
2225 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2226 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2227 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2228 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2229 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2230 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2231 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2232 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2233 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2234 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2235 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2236 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2237 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2238 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2239 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2240 };
2241
2242 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2243 .kind = "ip6tnl",
2244 .maxtype = IFLA_IPTUN_MAX,
2245 .policy = ip6_tnl_policy,
2246 .priv_size = sizeof(struct ip6_tnl),
2247 .setup = ip6_tnl_dev_setup,
2248 .validate = ip6_tnl_validate,
2249 .newlink = ip6_tnl_newlink,
2250 .changelink = ip6_tnl_changelink,
2251 .dellink = ip6_tnl_dellink,
2252 .get_size = ip6_tnl_get_size,
2253 .fill_info = ip6_tnl_fill_info,
2254 .get_link_net = ip6_tnl_get_link_net,
2255 };
2256
2257 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2258 .handler = ip4ip6_rcv,
2259 .err_handler = ip4ip6_err,
2260 .priority = 1,
2261 };
2262
2263 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2264 .handler = ip6ip6_rcv,
2265 .err_handler = ip6ip6_err,
2266 .priority = 1,
2267 };
2268
2269 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2270 .handler = mplsip6_rcv,
2271 .err_handler = mplsip6_err,
2272 .priority = 1,
2273 };
2274
ip6_tnl_exit_rtnl_net(struct net * net,struct list_head * list)2275 static void __net_exit ip6_tnl_exit_rtnl_net(struct net *net, struct list_head *list)
2276 {
2277 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2278 struct net_device *dev, *aux;
2279 int h;
2280 struct ip6_tnl *t;
2281
2282 for_each_netdev_safe(net, dev, aux)
2283 if (dev->rtnl_link_ops == &ip6_link_ops)
2284 unregister_netdevice_queue(dev, list);
2285
2286 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2287 t = rtnl_net_dereference(net, ip6n->tnls_r_l[h]);
2288 while (t) {
2289 /* If dev is in the same netns, it has already
2290 * been added to the list by the previous loop.
2291 */
2292 if (!net_eq(dev_net(t->dev), net))
2293 unregister_netdevice_queue(t->dev, list);
2294
2295 t = rtnl_net_dereference(net, t->next);
2296 }
2297 }
2298
2299 t = rtnl_net_dereference(net, ip6n->tnls_wc[0]);
2300 while (t) {
2301 /* If dev is in the same netns, it has already
2302 * been added to the list by the previous loop.
2303 */
2304 if (!net_eq(dev_net(t->dev), net))
2305 unregister_netdevice_queue(t->dev, list);
2306
2307 t = rtnl_net_dereference(net, t->next);
2308 }
2309 }
2310
ip6_tnl_init_net(struct net * net)2311 static int __net_init ip6_tnl_init_net(struct net *net)
2312 {
2313 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2314 struct ip6_tnl *t = NULL;
2315 int err;
2316
2317 ip6n->tnls[0] = ip6n->tnls_wc;
2318 ip6n->tnls[1] = ip6n->tnls_r_l;
2319
2320 if (!net_has_fallback_tunnels(net))
2321 return 0;
2322 err = -ENOMEM;
2323 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2324 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2325
2326 if (!ip6n->fb_tnl_dev)
2327 goto err_alloc_dev;
2328 dev_net_set(ip6n->fb_tnl_dev, net);
2329 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2330 /* FB netdevice is special: we have one, and only one per netns.
2331 * Allowing to move it to another netns is clearly unsafe.
2332 */
2333 ip6n->fb_tnl_dev->netns_immutable = true;
2334
2335 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2336 if (err < 0)
2337 goto err_register;
2338
2339 err = register_netdev(ip6n->fb_tnl_dev);
2340 if (err < 0)
2341 goto err_register;
2342
2343 t = netdev_priv(ip6n->fb_tnl_dev);
2344
2345 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2346 return 0;
2347
2348 err_register:
2349 free_netdev(ip6n->fb_tnl_dev);
2350 err_alloc_dev:
2351 return err;
2352 }
2353
2354 static struct pernet_operations ip6_tnl_net_ops = {
2355 .init = ip6_tnl_init_net,
2356 .exit_rtnl = ip6_tnl_exit_rtnl_net,
2357 .id = &ip6_tnl_net_id,
2358 .size = sizeof(struct ip6_tnl_net),
2359 };
2360
2361 /**
2362 * ip6_tunnel_init - register protocol and reserve needed resources
2363 *
2364 * Return: 0 on success
2365 **/
2366
ip6_tunnel_init(void)2367 static int __init ip6_tunnel_init(void)
2368 {
2369 int err;
2370
2371 if (!ipv6_mod_enabled())
2372 return -EOPNOTSUPP;
2373
2374 err = register_pernet_device(&ip6_tnl_net_ops);
2375 if (err < 0)
2376 goto out_pernet;
2377
2378 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2379 if (err < 0) {
2380 pr_err("%s: can't register ip4ip6\n", __func__);
2381 goto out_ip4ip6;
2382 }
2383
2384 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2385 if (err < 0) {
2386 pr_err("%s: can't register ip6ip6\n", __func__);
2387 goto out_ip6ip6;
2388 }
2389
2390 if (ip6_tnl_mpls_supported()) {
2391 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2392 if (err < 0) {
2393 pr_err("%s: can't register mplsip6\n", __func__);
2394 goto out_mplsip6;
2395 }
2396 }
2397
2398 err = rtnl_link_register(&ip6_link_ops);
2399 if (err < 0)
2400 goto rtnl_link_failed;
2401
2402 return 0;
2403
2404 rtnl_link_failed:
2405 if (ip6_tnl_mpls_supported())
2406 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2407 out_mplsip6:
2408 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2409 out_ip6ip6:
2410 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2411 out_ip4ip6:
2412 unregister_pernet_device(&ip6_tnl_net_ops);
2413 out_pernet:
2414 return err;
2415 }
2416
2417 /**
2418 * ip6_tunnel_cleanup - free resources and unregister protocol
2419 **/
2420
ip6_tunnel_cleanup(void)2421 static void __exit ip6_tunnel_cleanup(void)
2422 {
2423 rtnl_link_unregister(&ip6_link_ops);
2424 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2425 pr_info("%s: can't deregister ip4ip6\n", __func__);
2426
2427 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2428 pr_info("%s: can't deregister ip6ip6\n", __func__);
2429
2430 if (ip6_tnl_mpls_supported() &&
2431 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2432 pr_info("%s: can't deregister mplsip6\n", __func__);
2433 unregister_pernet_device(&ip6_tnl_net_ops);
2434 }
2435
2436 module_init(ip6_tunnel_init);
2437 module_exit(ip6_tunnel_cleanup);
2438