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
ip6_get_stats(struct net_device * dev)97 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
98 {
99 struct pcpu_sw_netstats tmp, sum = { 0 };
100 int i;
101
102 for_each_possible_cpu(i) {
103 unsigned int start;
104 const struct pcpu_sw_netstats *tstats =
105 per_cpu_ptr(dev->tstats, i);
106
107 do {
108 start = u64_stats_fetch_begin_irq(&tstats->syncp);
109 tmp.rx_packets = tstats->rx_packets;
110 tmp.rx_bytes = tstats->rx_bytes;
111 tmp.tx_packets = tstats->tx_packets;
112 tmp.tx_bytes = tstats->tx_bytes;
113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
114
115 sum.rx_packets += tmp.rx_packets;
116 sum.rx_bytes += tmp.rx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.tx_bytes += tmp.tx_bytes;
119 }
120 dev->stats.rx_packets = sum.rx_packets;
121 dev->stats.rx_bytes = sum.rx_bytes;
122 dev->stats.tx_packets = sum.tx_packets;
123 dev->stats.tx_bytes = sum.tx_bytes;
124 return &dev->stats;
125 }
126
127 #define for_each_ip6_tunnel_rcu(start) \
128 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
129
130 /**
131 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
132 * @net: network namespace
133 * @link: ifindex of underlying interface
134 * @remote: the address of the tunnel exit-point
135 * @local: the address of the tunnel entry-point
136 *
137 * Return:
138 * tunnel matching given end-points if found,
139 * else fallback tunnel if its device is up,
140 * else %NULL
141 **/
142
143 static struct ip6_tnl *
ip6_tnl_lookup(struct net * net,int link,const struct in6_addr * remote,const struct in6_addr * local)144 ip6_tnl_lookup(struct net *net, int link,
145 const struct in6_addr *remote, const struct in6_addr *local)
146 {
147 unsigned int hash = HASH(remote, local);
148 struct ip6_tnl *t, *cand = NULL;
149 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
150 struct in6_addr any;
151
152 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
153 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
154 !ipv6_addr_equal(remote, &t->parms.raddr) ||
155 !(t->dev->flags & IFF_UP))
156 continue;
157
158 if (link == t->parms.link)
159 return t;
160 else
161 cand = t;
162 }
163
164 memset(&any, 0, sizeof(any));
165 hash = HASH(&any, local);
166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
168 !ipv6_addr_any(&t->parms.raddr) ||
169 !(t->dev->flags & IFF_UP))
170 continue;
171
172 if (link == t->parms.link)
173 return t;
174 else if (!cand)
175 cand = t;
176 }
177
178 hash = HASH(remote, &any);
179 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
180 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
181 !ipv6_addr_any(&t->parms.laddr) ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (link == t->parms.link)
186 return t;
187 else if (!cand)
188 cand = t;
189 }
190
191 if (cand)
192 return cand;
193
194 t = rcu_dereference(ip6n->collect_md_tun);
195 if (t && t->dev->flags & IFF_UP)
196 return t;
197
198 t = rcu_dereference(ip6n->tnls_wc[0]);
199 if (t && (t->dev->flags & IFF_UP))
200 return t;
201
202 return NULL;
203 }
204
205 /**
206 * ip6_tnl_bucket - get head of list matching given tunnel parameters
207 * @p: parameters containing tunnel end-points
208 *
209 * Description:
210 * ip6_tnl_bucket() returns the head of the list matching the
211 * &struct in6_addr entries laddr and raddr in @p.
212 *
213 * Return: head of IPv6 tunnel list
214 **/
215
216 static struct ip6_tnl __rcu **
ip6_tnl_bucket(struct ip6_tnl_net * ip6n,const struct __ip6_tnl_parm * p)217 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
218 {
219 const struct in6_addr *remote = &p->raddr;
220 const struct in6_addr *local = &p->laddr;
221 unsigned int h = 0;
222 int prio = 0;
223
224 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
225 prio = 1;
226 h = HASH(remote, local);
227 }
228 return &ip6n->tnls[prio][h];
229 }
230
231 /**
232 * ip6_tnl_link - add tunnel to hash table
233 * @t: tunnel to be added
234 **/
235
236 static void
ip6_tnl_link(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)237 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
238 {
239 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
240
241 if (t->parms.collect_md)
242 rcu_assign_pointer(ip6n->collect_md_tun, t);
243 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
244 rcu_assign_pointer(*tp, t);
245 }
246
247 /**
248 * ip6_tnl_unlink - remove tunnel from hash table
249 * @t: tunnel to be removed
250 **/
251
252 static void
ip6_tnl_unlink(struct ip6_tnl_net * ip6n,struct ip6_tnl * t)253 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
254 {
255 struct ip6_tnl __rcu **tp;
256 struct ip6_tnl *iter;
257
258 if (t->parms.collect_md)
259 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
260
261 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
262 (iter = rtnl_dereference(*tp)) != NULL;
263 tp = &iter->next) {
264 if (t == iter) {
265 rcu_assign_pointer(*tp, t->next);
266 break;
267 }
268 }
269 }
270
ip6_dev_free(struct net_device * dev)271 static void ip6_dev_free(struct net_device *dev)
272 {
273 struct ip6_tnl *t = netdev_priv(dev);
274
275 gro_cells_destroy(&t->gro_cells);
276 dst_cache_destroy(&t->dst_cache);
277 free_percpu(dev->tstats);
278 }
279
ip6_tnl_create2(struct net_device * dev)280 static int ip6_tnl_create2(struct net_device *dev)
281 {
282 struct ip6_tnl *t = netdev_priv(dev);
283 struct net *net = dev_net(dev);
284 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
285 int err;
286
287 t = netdev_priv(dev);
288
289 dev->rtnl_link_ops = &ip6_link_ops;
290 err = register_netdevice(dev);
291 if (err < 0)
292 goto out;
293
294 strcpy(t->parms.name, dev->name);
295
296 ip6_tnl_link(ip6n, t);
297 return 0;
298
299 out:
300 return err;
301 }
302
303 /**
304 * ip6_tnl_create - create a new tunnel
305 * @net: network namespace
306 * @p: tunnel parameters
307 *
308 * Description:
309 * Create tunnel matching given parameters.
310 *
311 * Return:
312 * created tunnel or error pointer
313 **/
314
ip6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)315 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
316 {
317 struct net_device *dev;
318 struct ip6_tnl *t;
319 char name[IFNAMSIZ];
320 int err = -E2BIG;
321
322 if (p->name[0]) {
323 if (!dev_valid_name(p->name))
324 goto failed;
325 strlcpy(name, p->name, IFNAMSIZ);
326 } else {
327 sprintf(name, "ip6tnl%%d");
328 }
329 err = -ENOMEM;
330 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
331 ip6_tnl_dev_setup);
332 if (!dev)
333 goto failed;
334
335 dev_net_set(dev, net);
336
337 t = netdev_priv(dev);
338 t->parms = *p;
339 t->net = dev_net(dev);
340 err = ip6_tnl_create2(dev);
341 if (err < 0)
342 goto failed_free;
343
344 return t;
345
346 failed_free:
347 free_netdev(dev);
348 failed:
349 return ERR_PTR(err);
350 }
351
352 /**
353 * ip6_tnl_locate - find or create tunnel matching given parameters
354 * @net: network namespace
355 * @p: tunnel parameters
356 * @create: != 0 if allowed to create new tunnel if no match found
357 *
358 * Description:
359 * ip6_tnl_locate() first tries to locate an existing tunnel
360 * based on @parms. If this is unsuccessful, but @create is set a new
361 * tunnel device is created and registered for use.
362 *
363 * Return:
364 * matching tunnel or error pointer
365 **/
366
ip6_tnl_locate(struct net * net,struct __ip6_tnl_parm * p,int create)367 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
368 struct __ip6_tnl_parm *p, int create)
369 {
370 const struct in6_addr *remote = &p->raddr;
371 const struct in6_addr *local = &p->laddr;
372 struct ip6_tnl __rcu **tp;
373 struct ip6_tnl *t;
374 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
375
376 for (tp = ip6_tnl_bucket(ip6n, p);
377 (t = rtnl_dereference(*tp)) != NULL;
378 tp = &t->next) {
379 if (ipv6_addr_equal(local, &t->parms.laddr) &&
380 ipv6_addr_equal(remote, &t->parms.raddr) &&
381 p->link == t->parms.link) {
382 if (create)
383 return ERR_PTR(-EEXIST);
384
385 return t;
386 }
387 }
388 if (!create)
389 return ERR_PTR(-ENODEV);
390 return ip6_tnl_create(net, p);
391 }
392
393 /**
394 * ip6_tnl_dev_uninit - tunnel device uninitializer
395 * @dev: the device to be destroyed
396 *
397 * Description:
398 * ip6_tnl_dev_uninit() removes tunnel from its list
399 **/
400
401 static void
ip6_tnl_dev_uninit(struct net_device * dev)402 ip6_tnl_dev_uninit(struct net_device *dev)
403 {
404 struct ip6_tnl *t = netdev_priv(dev);
405 struct net *net = t->net;
406 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
407
408 if (dev == ip6n->fb_tnl_dev)
409 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
410 else
411 ip6_tnl_unlink(ip6n, t);
412 dst_cache_reset(&t->dst_cache);
413 dev_put(dev);
414 }
415
416 /**
417 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
418 * @skb: received socket buffer
419 *
420 * Return:
421 * 0 if none was found,
422 * else index to encapsulation limit
423 **/
424
ip6_tnl_parse_tlv_enc_lim(struct sk_buff * skb,__u8 * raw)425 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
426 {
427 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
428 unsigned int nhoff = raw - skb->data;
429 unsigned int off = nhoff + sizeof(*ipv6h);
430 u8 nexthdr = ipv6h->nexthdr;
431
432 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
433 struct ipv6_opt_hdr *hdr;
434 u16 optlen;
435
436 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
437 break;
438
439 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
440 if (nexthdr == NEXTHDR_FRAGMENT) {
441 optlen = 8;
442 } else if (nexthdr == NEXTHDR_AUTH) {
443 optlen = ipv6_authlen(hdr);
444 } else {
445 optlen = ipv6_optlen(hdr);
446 }
447
448 if (!pskb_may_pull(skb, off + optlen))
449 break;
450
451 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
452 if (nexthdr == NEXTHDR_FRAGMENT) {
453 struct frag_hdr *frag_hdr = (struct frag_hdr *)hdr;
454
455 if (frag_hdr->frag_off)
456 break;
457 }
458 if (nexthdr == NEXTHDR_DEST) {
459 u16 i = 2;
460
461 while (1) {
462 struct ipv6_tlv_tnl_enc_lim *tel;
463
464 /* No more room for encapsulation limit */
465 if (i + sizeof(*tel) > optlen)
466 break;
467
468 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
469 /* return index of option if found and valid */
470 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
471 tel->length == 1)
472 return i + off - nhoff;
473 /* else jump to next option */
474 if (tel->type)
475 i += tel->length + 2;
476 else
477 i++;
478 }
479 }
480 nexthdr = hdr->nexthdr;
481 off += optlen;
482 }
483 return 0;
484 }
485 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
486
487 /**
488 * ip6_tnl_err - tunnel error handler
489 *
490 * Description:
491 * ip6_tnl_err() should handle errors in the tunnel according
492 * to the specifications in RFC 2473.
493 **/
494
495 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)496 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
497 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
498 {
499 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
500 struct net *net = dev_net(skb->dev);
501 u8 rel_type = ICMPV6_DEST_UNREACH;
502 u8 rel_code = ICMPV6_ADDR_UNREACH;
503 __u32 rel_info = 0;
504 struct ip6_tnl *t;
505 int err = -ENOENT;
506 int rel_msg = 0;
507 u8 tproto;
508 __u16 len;
509
510 /* If the packet doesn't contain the original IPv6 header we are
511 in trouble since we might need the source address for further
512 processing of the error. */
513
514 rcu_read_lock();
515 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
516 if (!t)
517 goto out;
518
519 tproto = READ_ONCE(t->parms.proto);
520 if (tproto != ipproto && tproto != 0)
521 goto out;
522
523 err = 0;
524
525 switch (*type) {
526 case ICMPV6_DEST_UNREACH:
527 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
528 t->parms.name);
529 rel_msg = 1;
530 break;
531 case ICMPV6_TIME_EXCEED:
532 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
533 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
534 t->parms.name);
535 rel_msg = 1;
536 }
537 break;
538 case ICMPV6_PARAMPROB: {
539 struct ipv6_tlv_tnl_enc_lim *tel;
540 __u32 teli;
541
542 teli = 0;
543 if ((*code) == ICMPV6_HDR_FIELD)
544 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
545
546 if (teli && teli == *info - 2) {
547 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
548 if (tel->encap_limit == 0) {
549 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
550 t->parms.name);
551 rel_msg = 1;
552 }
553 } else {
554 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
555 t->parms.name);
556 }
557 break;
558 }
559 case ICMPV6_PKT_TOOBIG: {
560 __u32 mtu;
561
562 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
563 sock_net_uid(net, NULL));
564 mtu = *info - offset;
565 if (mtu < IPV6_MIN_MTU)
566 mtu = IPV6_MIN_MTU;
567 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
568 if (len > mtu) {
569 rel_type = ICMPV6_PKT_TOOBIG;
570 rel_code = 0;
571 rel_info = mtu;
572 rel_msg = 1;
573 }
574 break;
575 }
576 case NDISC_REDIRECT:
577 ip6_redirect(skb, net, skb->dev->ifindex, 0,
578 sock_net_uid(net, NULL));
579 break;
580 }
581
582 *type = rel_type;
583 *code = rel_code;
584 *info = rel_info;
585 *msg = rel_msg;
586
587 out:
588 rcu_read_unlock();
589 return err;
590 }
591
592 static int
ip4ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)593 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
594 u8 type, u8 code, int offset, __be32 info)
595 {
596 __u32 rel_info = ntohl(info);
597 const struct iphdr *eiph;
598 struct sk_buff *skb2;
599 int err, rel_msg = 0;
600 u8 rel_type = type;
601 u8 rel_code = code;
602 struct rtable *rt;
603 struct flowi4 fl4;
604
605 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
606 &rel_msg, &rel_info, offset);
607 if (err < 0)
608 return err;
609
610 if (rel_msg == 0)
611 return 0;
612
613 switch (rel_type) {
614 case ICMPV6_DEST_UNREACH:
615 if (rel_code != ICMPV6_ADDR_UNREACH)
616 return 0;
617 rel_type = ICMP_DEST_UNREACH;
618 rel_code = ICMP_HOST_UNREACH;
619 break;
620 case ICMPV6_PKT_TOOBIG:
621 if (rel_code != 0)
622 return 0;
623 rel_type = ICMP_DEST_UNREACH;
624 rel_code = ICMP_FRAG_NEEDED;
625 break;
626 default:
627 return 0;
628 }
629
630 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
631 return 0;
632
633 skb2 = skb_clone(skb, GFP_ATOMIC);
634 if (!skb2)
635 return 0;
636
637 skb_dst_drop(skb2);
638
639 skb_pull(skb2, offset);
640 skb_reset_network_header(skb2);
641 eiph = ip_hdr(skb2);
642
643 /* Try to guess incoming interface */
644 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
645 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
646 if (IS_ERR(rt))
647 goto out;
648
649 skb2->dev = rt->dst.dev;
650 ip_rt_put(rt);
651
652 /* route "incoming" packet */
653 if (rt->rt_flags & RTCF_LOCAL) {
654 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
655 eiph->daddr, eiph->saddr, 0, 0,
656 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
657 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
658 if (!IS_ERR(rt))
659 ip_rt_put(rt);
660 goto out;
661 }
662 skb_dst_set(skb2, &rt->dst);
663 } else {
664 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
665 skb2->dev) ||
666 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
667 goto out;
668 }
669
670 /* change mtu on this route */
671 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
672 if (rel_info > dst_mtu(skb_dst(skb2)))
673 goto out;
674
675 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
676 }
677
678 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
679
680 out:
681 kfree_skb(skb2);
682 return 0;
683 }
684
685 static int
ip6ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)686 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
687 u8 type, u8 code, int offset, __be32 info)
688 {
689 __u32 rel_info = ntohl(info);
690 int err, rel_msg = 0;
691 u8 rel_type = type;
692 u8 rel_code = code;
693
694 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
695 &rel_msg, &rel_info, offset);
696 if (err < 0)
697 return err;
698
699 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
700 struct rt6_info *rt;
701 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
702
703 if (!skb2)
704 return 0;
705
706 skb_dst_drop(skb2);
707 skb_pull(skb2, offset);
708 skb_reset_network_header(skb2);
709
710 /* Try to guess incoming interface */
711 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
712 NULL, 0, skb2, 0);
713
714 if (rt && rt->dst.dev)
715 skb2->dev = rt->dst.dev;
716
717 icmpv6_send(skb2, rel_type, rel_code, rel_info);
718
719 ip6_rt_put(rt);
720
721 kfree_skb(skb2);
722 }
723
724 return 0;
725 }
726
727 static int
mplsip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)728 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
729 u8 type, u8 code, int offset, __be32 info)
730 {
731 __u32 rel_info = ntohl(info);
732 int err, rel_msg = 0;
733 u8 rel_type = type;
734 u8 rel_code = code;
735
736 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
737 &rel_msg, &rel_info, offset);
738 return err;
739 }
740
ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)741 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
742 const struct ipv6hdr *ipv6h,
743 struct sk_buff *skb)
744 {
745 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
746
747 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
748 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
749
750 return IP6_ECN_decapsulate(ipv6h, skb);
751 }
752
ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)753 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
754 const struct ipv6hdr *ipv6h,
755 struct sk_buff *skb)
756 {
757 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
758 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
759
760 return IP6_ECN_decapsulate(ipv6h, skb);
761 }
762
mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)763 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
764 const struct ipv6hdr *ipv6h,
765 struct sk_buff *skb)
766 {
767 /* ECN is not supported in AF_MPLS */
768 return 0;
769 }
770
ip6_tnl_get_cap(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)771 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
772 const struct in6_addr *laddr,
773 const struct in6_addr *raddr)
774 {
775 struct __ip6_tnl_parm *p = &t->parms;
776 int ltype = ipv6_addr_type(laddr);
777 int rtype = ipv6_addr_type(raddr);
778 __u32 flags = 0;
779
780 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
781 flags = IP6_TNL_F_CAP_PER_PACKET;
782 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
783 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
784 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
785 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
786 if (ltype&IPV6_ADDR_UNICAST)
787 flags |= IP6_TNL_F_CAP_XMIT;
788 if (rtype&IPV6_ADDR_UNICAST)
789 flags |= IP6_TNL_F_CAP_RCV;
790 }
791 return flags;
792 }
793 EXPORT_SYMBOL(ip6_tnl_get_cap);
794
795 /* called with rcu_read_lock() */
ip6_tnl_rcv_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)796 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
797 const struct in6_addr *laddr,
798 const struct in6_addr *raddr)
799 {
800 struct __ip6_tnl_parm *p = &t->parms;
801 int ret = 0;
802 struct net *net = t->net;
803
804 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
805 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
806 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
807 struct net_device *ldev = NULL;
808
809 if (p->link)
810 ldev = dev_get_by_index_rcu(net, p->link);
811
812 if ((ipv6_addr_is_multicast(laddr) ||
813 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
814 0, IFA_F_TENTATIVE))) &&
815 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
816 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
817 0, IFA_F_TENTATIVE))))
818 ret = 1;
819 }
820 return ret;
821 }
822 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
823
__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)824 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
825 const struct tnl_ptk_info *tpi,
826 struct metadata_dst *tun_dst,
827 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
828 const struct ipv6hdr *ipv6h,
829 struct sk_buff *skb),
830 bool log_ecn_err)
831 {
832 const struct ipv6hdr *ipv6h;
833 int nh, err;
834
835 if ((!(tpi->flags & TUNNEL_CSUM) &&
836 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
837 ((tpi->flags & TUNNEL_CSUM) &&
838 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
839 tunnel->dev->stats.rx_crc_errors++;
840 tunnel->dev->stats.rx_errors++;
841 goto drop;
842 }
843
844 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
845 if (!(tpi->flags & TUNNEL_SEQ) ||
846 (tunnel->i_seqno &&
847 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
848 tunnel->dev->stats.rx_fifo_errors++;
849 tunnel->dev->stats.rx_errors++;
850 goto drop;
851 }
852 tunnel->i_seqno = ntohl(tpi->seq) + 1;
853 }
854
855 skb->protocol = tpi->proto;
856
857 /* Warning: All skb pointers will be invalidated! */
858 if (tunnel->dev->type == ARPHRD_ETHER) {
859 if (!pskb_may_pull(skb, ETH_HLEN)) {
860 tunnel->dev->stats.rx_length_errors++;
861 tunnel->dev->stats.rx_errors++;
862 goto drop;
863 }
864
865 skb->protocol = eth_type_trans(skb, tunnel->dev);
866 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
867 } else {
868 skb->dev = tunnel->dev;
869 }
870
871 /* Save offset of outer header relative to skb->head,
872 * because we are going to reset the network header to the inner header
873 * and might change skb->head.
874 */
875 nh = skb_network_header(skb) - skb->head;
876
877 skb_reset_network_header(skb);
878
879 if (!pskb_inet_may_pull(skb)) {
880 DEV_STATS_INC(tunnel->dev, rx_length_errors);
881 DEV_STATS_INC(tunnel->dev, rx_errors);
882 goto drop;
883 }
884
885 /* Get the outer header. */
886 ipv6h = (struct ipv6hdr *)(skb->head + nh);
887
888 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
889
890 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
891
892 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
893 if (unlikely(err)) {
894 if (log_ecn_err)
895 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
896 &ipv6h->saddr,
897 ipv6_get_dsfield(ipv6h));
898 if (err > 1) {
899 ++tunnel->dev->stats.rx_frame_errors;
900 ++tunnel->dev->stats.rx_errors;
901 goto drop;
902 }
903 }
904
905 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
906
907 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
908
909 if (tun_dst)
910 skb_dst_set(skb, (struct dst_entry *)tun_dst);
911
912 gro_cells_receive(&tunnel->gro_cells, skb);
913 return 0;
914
915 drop:
916 if (tun_dst)
917 dst_release((struct dst_entry *)tun_dst);
918 kfree_skb(skb);
919 return 0;
920 }
921
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)922 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
923 const struct tnl_ptk_info *tpi,
924 struct metadata_dst *tun_dst,
925 bool log_ecn_err)
926 {
927 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
928 const struct ipv6hdr *ipv6h,
929 struct sk_buff *skb);
930
931 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
932 if (tpi->proto == htons(ETH_P_IP))
933 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
934
935 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
936 log_ecn_err);
937 }
938 EXPORT_SYMBOL(ip6_tnl_rcv);
939
940 static const struct tnl_ptk_info tpi_v6 = {
941 /* no tunnel info required for ipxip6. */
942 .proto = htons(ETH_P_IPV6),
943 };
944
945 static const struct tnl_ptk_info tpi_v4 = {
946 /* no tunnel info required for ipxip6. */
947 .proto = htons(ETH_P_IP),
948 };
949
950 static const struct tnl_ptk_info tpi_mpls = {
951 /* no tunnel info required for mplsip6. */
952 .proto = htons(ETH_P_MPLS_UC),
953 };
954
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))955 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
956 const struct tnl_ptk_info *tpi,
957 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
958 const struct ipv6hdr *ipv6h,
959 struct sk_buff *skb))
960 {
961 struct ip6_tnl *t;
962 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
963 struct metadata_dst *tun_dst = NULL;
964 int ret = -1;
965
966 rcu_read_lock();
967 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
968
969 if (t) {
970 u8 tproto = READ_ONCE(t->parms.proto);
971
972 if (tproto != ipproto && tproto != 0)
973 goto drop;
974 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
975 goto drop;
976 ipv6h = ipv6_hdr(skb);
977 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
978 goto drop;
979 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
980 goto drop;
981 if (t->parms.collect_md) {
982 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
983 if (!tun_dst)
984 goto drop;
985 }
986 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
987 log_ecn_error);
988 }
989
990 rcu_read_unlock();
991
992 return ret;
993
994 drop:
995 rcu_read_unlock();
996 kfree_skb(skb);
997 return 0;
998 }
999
ip4ip6_rcv(struct sk_buff * skb)1000 static int ip4ip6_rcv(struct sk_buff *skb)
1001 {
1002 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
1003 ip4ip6_dscp_ecn_decapsulate);
1004 }
1005
ip6ip6_rcv(struct sk_buff * skb)1006 static int ip6ip6_rcv(struct sk_buff *skb)
1007 {
1008 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
1009 ip6ip6_dscp_ecn_decapsulate);
1010 }
1011
mplsip6_rcv(struct sk_buff * skb)1012 static int mplsip6_rcv(struct sk_buff *skb)
1013 {
1014 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
1015 mplsip6_dscp_ecn_decapsulate);
1016 }
1017
1018 struct ipv6_tel_txoption {
1019 struct ipv6_txoptions ops;
1020 __u8 dst_opt[8];
1021 };
1022
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)1023 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
1024 {
1025 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
1026
1027 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
1028 opt->dst_opt[3] = 1;
1029 opt->dst_opt[4] = encap_limit;
1030 opt->dst_opt[5] = IPV6_TLV_PADN;
1031 opt->dst_opt[6] = 1;
1032
1033 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1034 opt->ops.opt_nflen = 8;
1035 }
1036
1037 /**
1038 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1039 * @t: the outgoing tunnel device
1040 * @hdr: IPv6 header from the incoming packet
1041 *
1042 * Description:
1043 * Avoid trivial tunneling loop by checking that tunnel exit-point
1044 * doesn't match source of incoming packet.
1045 *
1046 * Return:
1047 * 1 if conflict,
1048 * 0 else
1049 **/
1050
1051 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1052 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1053 {
1054 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1055 }
1056
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1057 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1058 const struct in6_addr *laddr,
1059 const struct in6_addr *raddr)
1060 {
1061 struct __ip6_tnl_parm *p = &t->parms;
1062 int ret = 0;
1063 struct net *net = t->net;
1064
1065 if (t->parms.collect_md)
1066 return 1;
1067
1068 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1069 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1070 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1071 struct net_device *ldev = NULL;
1072
1073 rcu_read_lock();
1074 if (p->link)
1075 ldev = dev_get_by_index_rcu(net, p->link);
1076
1077 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1078 0, IFA_F_TENTATIVE)))
1079 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1080 p->name);
1081 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1082 !ipv6_addr_is_multicast(raddr) &&
1083 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1084 true, 0, IFA_F_TENTATIVE)))
1085 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1086 p->name);
1087 else
1088 ret = 1;
1089 rcu_read_unlock();
1090 }
1091 return ret;
1092 }
1093 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1094
1095 /**
1096 * ip6_tnl_xmit - encapsulate packet and send
1097 * @skb: the outgoing socket buffer
1098 * @dev: the outgoing tunnel device
1099 * @dsfield: dscp code for outer header
1100 * @fl6: flow of tunneled packet
1101 * @encap_limit: encapsulation limit
1102 * @pmtu: Path MTU is stored if packet is too big
1103 * @proto: next header value
1104 *
1105 * Description:
1106 * Build new header and do some sanity checks on the packet before sending
1107 * it.
1108 *
1109 * Return:
1110 * 0 on success
1111 * -1 fail
1112 * %-EMSGSIZE message too big. return mtu in this case.
1113 **/
1114
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1115 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1116 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1117 __u8 proto)
1118 {
1119 struct ip6_tnl *t = netdev_priv(dev);
1120 struct net *net = t->net;
1121 struct net_device_stats *stats = &t->dev->stats;
1122 struct ipv6hdr *ipv6h;
1123 struct ipv6_tel_txoption opt;
1124 struct dst_entry *dst = NULL, *ndst = NULL;
1125 struct net_device *tdev;
1126 int mtu;
1127 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1128 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1129 unsigned int max_headroom = psh_hlen;
1130 bool use_cache = false;
1131 u8 hop_limit;
1132 int err = -1;
1133
1134 if (t->parms.collect_md) {
1135 hop_limit = skb_tunnel_info(skb)->key.ttl;
1136 goto route_lookup;
1137 } else {
1138 hop_limit = t->parms.hop_limit;
1139 }
1140
1141 /* NBMA tunnel */
1142 if (ipv6_addr_any(&t->parms.raddr)) {
1143 if (skb->protocol == htons(ETH_P_IPV6)) {
1144 struct in6_addr *addr6;
1145 struct neighbour *neigh;
1146 int addr_type;
1147
1148 if (!skb_dst(skb))
1149 goto tx_err_link_failure;
1150
1151 neigh = dst_neigh_lookup(skb_dst(skb),
1152 &ipv6_hdr(skb)->daddr);
1153 if (!neigh)
1154 goto tx_err_link_failure;
1155
1156 addr6 = (struct in6_addr *)&neigh->primary_key;
1157 addr_type = ipv6_addr_type(addr6);
1158
1159 if (addr_type == IPV6_ADDR_ANY)
1160 addr6 = &ipv6_hdr(skb)->daddr;
1161
1162 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1163 neigh_release(neigh);
1164 }
1165 } else if (t->parms.proto != 0 && !(t->parms.flags &
1166 (IP6_TNL_F_USE_ORIG_TCLASS |
1167 IP6_TNL_F_USE_ORIG_FWMARK))) {
1168 /* enable the cache only if neither the outer protocol nor the
1169 * routing decision depends on the current inner header value
1170 */
1171 use_cache = true;
1172 }
1173
1174 if (use_cache)
1175 dst = dst_cache_get(&t->dst_cache);
1176
1177 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1178 goto tx_err_link_failure;
1179
1180 if (!dst) {
1181 route_lookup:
1182 /* add dsfield to flowlabel for route lookup */
1183 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1184
1185 dst = ip6_route_output(net, NULL, fl6);
1186
1187 if (dst->error)
1188 goto tx_err_link_failure;
1189 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1190 if (IS_ERR(dst)) {
1191 err = PTR_ERR(dst);
1192 dst = NULL;
1193 goto tx_err_link_failure;
1194 }
1195 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1196 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1197 &fl6->daddr, 0, &fl6->saddr))
1198 goto tx_err_link_failure;
1199 ndst = dst;
1200 }
1201
1202 tdev = dst->dev;
1203
1204 if (tdev == dev) {
1205 stats->collisions++;
1206 net_warn_ratelimited("%s: Local routing loop detected!\n",
1207 t->parms.name);
1208 goto tx_err_dst_release;
1209 }
1210 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1211 if (encap_limit >= 0) {
1212 max_headroom += 8;
1213 mtu -= 8;
1214 }
1215 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1216 IPV6_MIN_MTU : IPV4_MIN_MTU);
1217
1218 skb_dst_update_pmtu_no_confirm(skb, mtu);
1219 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1220 *pmtu = mtu;
1221 err = -EMSGSIZE;
1222 goto tx_err_dst_release;
1223 }
1224
1225 if (t->err_count > 0) {
1226 if (time_before(jiffies,
1227 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1228 t->err_count--;
1229
1230 dst_link_failure(skb);
1231 } else {
1232 t->err_count = 0;
1233 }
1234 }
1235
1236 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1237
1238 /*
1239 * Okay, now see if we can stuff it in the buffer as-is.
1240 */
1241 max_headroom += LL_RESERVED_SPACE(tdev);
1242
1243 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1244 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1245 struct sk_buff *new_skb;
1246
1247 new_skb = skb_realloc_headroom(skb, max_headroom);
1248 if (!new_skb)
1249 goto tx_err_dst_release;
1250
1251 if (skb->sk)
1252 skb_set_owner_w(new_skb, skb->sk);
1253 consume_skb(skb);
1254 skb = new_skb;
1255 }
1256
1257 if (t->parms.collect_md) {
1258 if (t->encap.type != TUNNEL_ENCAP_NONE)
1259 goto tx_err_dst_release;
1260 } else {
1261 if (use_cache && ndst)
1262 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1263 }
1264 skb_dst_set(skb, dst);
1265
1266 if (hop_limit == 0) {
1267 if (skb->protocol == htons(ETH_P_IP))
1268 hop_limit = ip_hdr(skb)->ttl;
1269 else if (skb->protocol == htons(ETH_P_IPV6))
1270 hop_limit = ipv6_hdr(skb)->hop_limit;
1271 else
1272 hop_limit = ip6_dst_hoplimit(dst);
1273 }
1274
1275 /* Calculate max headroom for all the headers and adjust
1276 * needed_headroom if necessary.
1277 */
1278 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1279 + dst->header_len + t->hlen;
1280 if (max_headroom > READ_ONCE(dev->needed_headroom))
1281 WRITE_ONCE(dev->needed_headroom, max_headroom);
1282
1283 err = ip6_tnl_encap(skb, t, &proto, fl6);
1284 if (err)
1285 return err;
1286
1287 if (encap_limit >= 0) {
1288 init_tel_txopt(&opt, encap_limit);
1289 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1290 }
1291
1292 skb_push(skb, sizeof(struct ipv6hdr));
1293 skb_reset_network_header(skb);
1294 ipv6h = ipv6_hdr(skb);
1295 ip6_flow_hdr(ipv6h, dsfield,
1296 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1297 ipv6h->hop_limit = hop_limit;
1298 ipv6h->nexthdr = proto;
1299 ipv6h->saddr = fl6->saddr;
1300 ipv6h->daddr = fl6->daddr;
1301 ip6tunnel_xmit(NULL, skb, dev);
1302 return 0;
1303 tx_err_link_failure:
1304 stats->tx_carrier_errors++;
1305 dst_link_failure(skb);
1306 tx_err_dst_release:
1307 dst_release(dst);
1308 return err;
1309 }
1310 EXPORT_SYMBOL(ip6_tnl_xmit);
1311
1312 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1313 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1314 u8 protocol)
1315 {
1316 struct ip6_tnl *t = netdev_priv(dev);
1317 struct ipv6hdr *ipv6h;
1318 const struct iphdr *iph;
1319 int encap_limit = -1;
1320 __u16 offset;
1321 struct flowi6 fl6;
1322 __u8 dsfield, orig_dsfield;
1323 __u32 mtu;
1324 u8 tproto;
1325 int err;
1326
1327 tproto = READ_ONCE(t->parms.proto);
1328 if (tproto != protocol && tproto != 0)
1329 return -1;
1330
1331 if (t->parms.collect_md) {
1332 struct ip_tunnel_info *tun_info;
1333 const struct ip_tunnel_key *key;
1334
1335 tun_info = skb_tunnel_info(skb);
1336 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1337 ip_tunnel_info_af(tun_info) != AF_INET6))
1338 return -1;
1339 key = &tun_info->key;
1340 memset(&fl6, 0, sizeof(fl6));
1341 fl6.flowi6_proto = protocol;
1342 fl6.saddr = key->u.ipv6.src;
1343 fl6.daddr = key->u.ipv6.dst;
1344 fl6.flowlabel = key->label;
1345 dsfield = key->tos;
1346 switch (protocol) {
1347 case IPPROTO_IPIP:
1348 iph = ip_hdr(skb);
1349 orig_dsfield = ipv4_get_dsfield(iph);
1350 break;
1351 case IPPROTO_IPV6:
1352 ipv6h = ipv6_hdr(skb);
1353 orig_dsfield = ipv6_get_dsfield(ipv6h);
1354 break;
1355 default:
1356 orig_dsfield = dsfield;
1357 break;
1358 }
1359 } else {
1360 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1361 encap_limit = t->parms.encap_limit;
1362 if (protocol == IPPROTO_IPV6) {
1363 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1364 skb_network_header(skb));
1365 /* ip6_tnl_parse_tlv_enc_lim() might have
1366 * reallocated skb->head
1367 */
1368 if (offset > 0) {
1369 struct ipv6_tlv_tnl_enc_lim *tel;
1370
1371 tel = (void *)&skb_network_header(skb)[offset];
1372 if (tel->encap_limit == 0) {
1373 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1374 ICMPV6_HDR_FIELD, offset + 2);
1375 return -1;
1376 }
1377 encap_limit = tel->encap_limit - 1;
1378 }
1379 }
1380
1381 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1382 fl6.flowi6_proto = protocol;
1383
1384 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1385 fl6.flowi6_mark = skb->mark;
1386 else
1387 fl6.flowi6_mark = t->parms.fwmark;
1388 switch (protocol) {
1389 case IPPROTO_IPIP:
1390 iph = ip_hdr(skb);
1391 orig_dsfield = ipv4_get_dsfield(iph);
1392 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1393 dsfield = orig_dsfield;
1394 else
1395 dsfield = ip6_tclass(t->parms.flowinfo);
1396 break;
1397 case IPPROTO_IPV6:
1398 ipv6h = ipv6_hdr(skb);
1399 orig_dsfield = ipv6_get_dsfield(ipv6h);
1400 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1401 dsfield = orig_dsfield;
1402 else
1403 dsfield = ip6_tclass(t->parms.flowinfo);
1404 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1405 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1406 break;
1407 default:
1408 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1409 break;
1410 }
1411 }
1412
1413 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1414 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1415
1416 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1417 return -1;
1418
1419 skb_set_inner_ipproto(skb, protocol);
1420
1421 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1422 protocol);
1423 if (err != 0) {
1424 /* XXX: send ICMP error even if DF is not set. */
1425 if (err == -EMSGSIZE)
1426 switch (protocol) {
1427 case IPPROTO_IPIP:
1428 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1429 ICMP_FRAG_NEEDED, htonl(mtu));
1430 break;
1431 case IPPROTO_IPV6:
1432 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1433 break;
1434 default:
1435 break;
1436 }
1437 return -1;
1438 }
1439
1440 return 0;
1441 }
1442
1443 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1444 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1445 {
1446 struct ip6_tnl *t = netdev_priv(dev);
1447 struct net_device_stats *stats = &t->dev->stats;
1448 u8 ipproto;
1449 int ret;
1450
1451 if (!pskb_inet_may_pull(skb))
1452 goto tx_err;
1453
1454 switch (skb->protocol) {
1455 case htons(ETH_P_IP):
1456 ipproto = IPPROTO_IPIP;
1457 break;
1458 case htons(ETH_P_IPV6):
1459 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1460 goto tx_err;
1461 ipproto = IPPROTO_IPV6;
1462 break;
1463 case htons(ETH_P_MPLS_UC):
1464 ipproto = IPPROTO_MPLS;
1465 break;
1466 default:
1467 goto tx_err;
1468 }
1469
1470 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1471 if (ret < 0)
1472 goto tx_err;
1473
1474 return NETDEV_TX_OK;
1475
1476 tx_err:
1477 stats->tx_errors++;
1478 stats->tx_dropped++;
1479 kfree_skb(skb);
1480 return NETDEV_TX_OK;
1481 }
1482
ip6_tnl_link_config(struct ip6_tnl * t)1483 static void ip6_tnl_link_config(struct ip6_tnl *t)
1484 {
1485 struct net_device *dev = t->dev;
1486 struct net_device *tdev = NULL;
1487 struct __ip6_tnl_parm *p = &t->parms;
1488 struct flowi6 *fl6 = &t->fl.u.ip6;
1489 int t_hlen;
1490 int mtu;
1491
1492 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1493 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1494
1495 /* Set up flowi template */
1496 fl6->saddr = p->laddr;
1497 fl6->daddr = p->raddr;
1498 fl6->flowi6_oif = p->link;
1499 fl6->flowlabel = 0;
1500
1501 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1502 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1503 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1504 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1505
1506 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1507 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1508
1509 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1510 dev->flags |= IFF_POINTOPOINT;
1511 else
1512 dev->flags &= ~IFF_POINTOPOINT;
1513
1514 t->tun_hlen = 0;
1515 t->hlen = t->encap_hlen + t->tun_hlen;
1516 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1517
1518 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1519 int strict = (ipv6_addr_type(&p->raddr) &
1520 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1521
1522 struct rt6_info *rt = rt6_lookup(t->net,
1523 &p->raddr, &p->laddr,
1524 p->link, NULL, strict);
1525 if (rt) {
1526 tdev = rt->dst.dev;
1527 ip6_rt_put(rt);
1528 }
1529
1530 if (!tdev && p->link)
1531 tdev = __dev_get_by_index(t->net, p->link);
1532
1533 if (tdev) {
1534 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1535 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1536
1537 mtu = mtu - t_hlen;
1538 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1539 mtu -= 8;
1540
1541 if (mtu < IPV6_MIN_MTU)
1542 mtu = IPV6_MIN_MTU;
1543 WRITE_ONCE(dev->mtu, mtu);
1544 }
1545 }
1546 }
1547
1548 /**
1549 * ip6_tnl_change - update the tunnel parameters
1550 * @t: tunnel to be changed
1551 * @p: tunnel configuration parameters
1552 *
1553 * Description:
1554 * ip6_tnl_change() updates the tunnel parameters
1555 **/
1556
1557 static int
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1558 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1559 {
1560 t->parms.laddr = p->laddr;
1561 t->parms.raddr = p->raddr;
1562 t->parms.flags = p->flags;
1563 t->parms.hop_limit = p->hop_limit;
1564 t->parms.encap_limit = p->encap_limit;
1565 t->parms.flowinfo = p->flowinfo;
1566 t->parms.link = p->link;
1567 t->parms.proto = p->proto;
1568 t->parms.fwmark = p->fwmark;
1569 dst_cache_reset(&t->dst_cache);
1570 ip6_tnl_link_config(t);
1571 return 0;
1572 }
1573
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1574 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1575 {
1576 struct net *net = t->net;
1577 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1578 int err;
1579
1580 ip6_tnl_unlink(ip6n, t);
1581 synchronize_net();
1582 err = ip6_tnl_change(t, p);
1583 ip6_tnl_link(ip6n, t);
1584 netdev_state_change(t->dev);
1585 return err;
1586 }
1587
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1588 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1589 {
1590 /* for default tnl0 device allow to change only the proto */
1591 t->parms.proto = p->proto;
1592 netdev_state_change(t->dev);
1593 return 0;
1594 }
1595
1596 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1597 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1598 {
1599 p->laddr = u->laddr;
1600 p->raddr = u->raddr;
1601 p->flags = u->flags;
1602 p->hop_limit = u->hop_limit;
1603 p->encap_limit = u->encap_limit;
1604 p->flowinfo = u->flowinfo;
1605 p->link = u->link;
1606 p->proto = u->proto;
1607 memcpy(p->name, u->name, sizeof(u->name));
1608 }
1609
1610 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1611 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1612 {
1613 u->laddr = p->laddr;
1614 u->raddr = p->raddr;
1615 u->flags = p->flags;
1616 u->hop_limit = p->hop_limit;
1617 u->encap_limit = p->encap_limit;
1618 u->flowinfo = p->flowinfo;
1619 u->link = p->link;
1620 u->proto = p->proto;
1621 memcpy(u->name, p->name, sizeof(u->name));
1622 }
1623
1624 /**
1625 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1626 * @dev: virtual device associated with tunnel
1627 * @ifr: parameters passed from userspace
1628 * @cmd: command to be performed
1629 *
1630 * Description:
1631 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1632 * from userspace.
1633 *
1634 * The possible commands are the following:
1635 * %SIOCGETTUNNEL: get tunnel parameters for device
1636 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1637 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1638 * %SIOCDELTUNNEL: delete tunnel
1639 *
1640 * The fallback device "ip6tnl0", created during module
1641 * initialization, can be used for creating other tunnel devices.
1642 *
1643 * Return:
1644 * 0 on success,
1645 * %-EFAULT if unable to copy data to or from userspace,
1646 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1647 * %-EINVAL if passed tunnel parameters are invalid,
1648 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1649 * %-ENODEV if attempting to change or delete a nonexisting device
1650 **/
1651
1652 static int
ip6_tnl_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1653 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1654 {
1655 int err = 0;
1656 struct ip6_tnl_parm p;
1657 struct __ip6_tnl_parm p1;
1658 struct ip6_tnl *t = netdev_priv(dev);
1659 struct net *net = t->net;
1660 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1661
1662 memset(&p1, 0, sizeof(p1));
1663
1664 switch (cmd) {
1665 case SIOCGETTUNNEL:
1666 if (dev == ip6n->fb_tnl_dev) {
1667 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1668 err = -EFAULT;
1669 break;
1670 }
1671 ip6_tnl_parm_from_user(&p1, &p);
1672 t = ip6_tnl_locate(net, &p1, 0);
1673 if (IS_ERR(t))
1674 t = netdev_priv(dev);
1675 } else {
1676 memset(&p, 0, sizeof(p));
1677 }
1678 ip6_tnl_parm_to_user(&p, &t->parms);
1679 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1680 err = -EFAULT;
1681 }
1682 break;
1683 case SIOCADDTUNNEL:
1684 case SIOCCHGTUNNEL:
1685 err = -EPERM;
1686 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1687 break;
1688 err = -EFAULT;
1689 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1690 break;
1691 err = -EINVAL;
1692 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1693 p.proto != 0)
1694 break;
1695 ip6_tnl_parm_from_user(&p1, &p);
1696 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1697 if (cmd == SIOCCHGTUNNEL) {
1698 if (!IS_ERR(t)) {
1699 if (t->dev != dev) {
1700 err = -EEXIST;
1701 break;
1702 }
1703 } else
1704 t = netdev_priv(dev);
1705 if (dev == ip6n->fb_tnl_dev)
1706 err = ip6_tnl0_update(t, &p1);
1707 else
1708 err = ip6_tnl_update(t, &p1);
1709 }
1710 if (!IS_ERR(t)) {
1711 err = 0;
1712 ip6_tnl_parm_to_user(&p, &t->parms);
1713 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1714 err = -EFAULT;
1715
1716 } else {
1717 err = PTR_ERR(t);
1718 }
1719 break;
1720 case SIOCDELTUNNEL:
1721 err = -EPERM;
1722 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1723 break;
1724
1725 if (dev == ip6n->fb_tnl_dev) {
1726 err = -EFAULT;
1727 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1728 break;
1729 err = -ENOENT;
1730 ip6_tnl_parm_from_user(&p1, &p);
1731 t = ip6_tnl_locate(net, &p1, 0);
1732 if (IS_ERR(t))
1733 break;
1734 err = -EPERM;
1735 if (t->dev == ip6n->fb_tnl_dev)
1736 break;
1737 dev = t->dev;
1738 }
1739 err = 0;
1740 unregister_netdevice(dev);
1741 break;
1742 default:
1743 err = -EINVAL;
1744 }
1745 return err;
1746 }
1747
1748 /**
1749 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1750 * @dev: virtual device associated with tunnel
1751 * @new_mtu: the new mtu
1752 *
1753 * Return:
1754 * 0 on success,
1755 * %-EINVAL if mtu too small
1756 **/
1757
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1758 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1759 {
1760 struct ip6_tnl *tnl = netdev_priv(dev);
1761
1762 if (tnl->parms.proto == IPPROTO_IPV6) {
1763 if (new_mtu < IPV6_MIN_MTU)
1764 return -EINVAL;
1765 } else {
1766 if (new_mtu < ETH_MIN_MTU)
1767 return -EINVAL;
1768 }
1769 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1770 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1771 return -EINVAL;
1772 } else {
1773 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1774 return -EINVAL;
1775 }
1776 dev->mtu = new_mtu;
1777 return 0;
1778 }
1779 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1780
ip6_tnl_get_iflink(const struct net_device * dev)1781 int ip6_tnl_get_iflink(const struct net_device *dev)
1782 {
1783 struct ip6_tnl *t = netdev_priv(dev);
1784
1785 return t->parms.link;
1786 }
1787 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1788
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1789 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1790 unsigned int num)
1791 {
1792 if (num >= MAX_IPTUN_ENCAP_OPS)
1793 return -ERANGE;
1794
1795 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1796 &ip6tun_encaps[num],
1797 NULL, ops) ? 0 : -1;
1798 }
1799 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1800
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1801 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1802 unsigned int num)
1803 {
1804 int ret;
1805
1806 if (num >= MAX_IPTUN_ENCAP_OPS)
1807 return -ERANGE;
1808
1809 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1810 &ip6tun_encaps[num],
1811 ops, NULL) == ops) ? 0 : -1;
1812
1813 synchronize_net();
1814
1815 return ret;
1816 }
1817 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1818
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1819 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1820 struct ip_tunnel_encap *ipencap)
1821 {
1822 int hlen;
1823
1824 memset(&t->encap, 0, sizeof(t->encap));
1825
1826 hlen = ip6_encap_hlen(ipencap);
1827 if (hlen < 0)
1828 return hlen;
1829
1830 t->encap.type = ipencap->type;
1831 t->encap.sport = ipencap->sport;
1832 t->encap.dport = ipencap->dport;
1833 t->encap.flags = ipencap->flags;
1834
1835 t->encap_hlen = hlen;
1836 t->hlen = t->encap_hlen + t->tun_hlen;
1837
1838 return 0;
1839 }
1840 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1841
1842 static const struct net_device_ops ip6_tnl_netdev_ops = {
1843 .ndo_init = ip6_tnl_dev_init,
1844 .ndo_uninit = ip6_tnl_dev_uninit,
1845 .ndo_start_xmit = ip6_tnl_start_xmit,
1846 .ndo_do_ioctl = ip6_tnl_ioctl,
1847 .ndo_change_mtu = ip6_tnl_change_mtu,
1848 .ndo_get_stats = ip6_get_stats,
1849 .ndo_get_iflink = ip6_tnl_get_iflink,
1850 };
1851
1852 #define IPXIPX_FEATURES (NETIF_F_SG | \
1853 NETIF_F_FRAGLIST | \
1854 NETIF_F_HIGHDMA | \
1855 NETIF_F_GSO_SOFTWARE | \
1856 NETIF_F_HW_CSUM)
1857
1858 /**
1859 * ip6_tnl_dev_setup - setup virtual tunnel device
1860 * @dev: virtual device associated with tunnel
1861 *
1862 * Description:
1863 * Initialize function pointers and device parameters
1864 **/
1865
ip6_tnl_dev_setup(struct net_device * dev)1866 static void ip6_tnl_dev_setup(struct net_device *dev)
1867 {
1868 dev->netdev_ops = &ip6_tnl_netdev_ops;
1869 dev->header_ops = &ip_tunnel_header_ops;
1870 dev->needs_free_netdev = true;
1871 dev->priv_destructor = ip6_dev_free;
1872
1873 dev->type = ARPHRD_TUNNEL6;
1874 dev->flags |= IFF_NOARP;
1875 dev->addr_len = sizeof(struct in6_addr);
1876 dev->features |= NETIF_F_LLTX;
1877 netif_keep_dst(dev);
1878
1879 dev->features |= IPXIPX_FEATURES;
1880 dev->hw_features |= IPXIPX_FEATURES;
1881
1882 /* This perm addr will be used as interface identifier by IPv6 */
1883 dev->addr_assign_type = NET_ADDR_RANDOM;
1884 eth_random_addr(dev->perm_addr);
1885 }
1886
1887
1888 /**
1889 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1890 * @dev: virtual device associated with tunnel
1891 **/
1892
1893 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1894 ip6_tnl_dev_init_gen(struct net_device *dev)
1895 {
1896 struct ip6_tnl *t = netdev_priv(dev);
1897 int ret;
1898 int t_hlen;
1899
1900 t->dev = dev;
1901 t->net = dev_net(dev);
1902 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1903 if (!dev->tstats)
1904 return -ENOMEM;
1905
1906 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1907 if (ret)
1908 goto free_stats;
1909
1910 ret = gro_cells_init(&t->gro_cells, dev);
1911 if (ret)
1912 goto destroy_dst;
1913
1914 t->tun_hlen = 0;
1915 t->hlen = t->encap_hlen + t->tun_hlen;
1916 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1917
1918 dev->type = ARPHRD_TUNNEL6;
1919 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1920 dev->mtu = ETH_DATA_LEN - t_hlen;
1921 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1922 dev->mtu -= 8;
1923 dev->min_mtu = ETH_MIN_MTU;
1924 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1925
1926 dev_hold(dev);
1927 return 0;
1928
1929 destroy_dst:
1930 dst_cache_destroy(&t->dst_cache);
1931 free_stats:
1932 free_percpu(dev->tstats);
1933 dev->tstats = NULL;
1934
1935 return ret;
1936 }
1937
1938 /**
1939 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1940 * @dev: virtual device associated with tunnel
1941 **/
1942
ip6_tnl_dev_init(struct net_device * dev)1943 static int ip6_tnl_dev_init(struct net_device *dev)
1944 {
1945 struct ip6_tnl *t = netdev_priv(dev);
1946 int err = ip6_tnl_dev_init_gen(dev);
1947
1948 if (err)
1949 return err;
1950 ip6_tnl_link_config(t);
1951 if (t->parms.collect_md)
1952 netif_keep_dst(dev);
1953 return 0;
1954 }
1955
1956 /**
1957 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1958 * @dev: fallback device
1959 *
1960 * Return: 0
1961 **/
1962
ip6_fb_tnl_dev_init(struct net_device * dev)1963 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1964 {
1965 struct ip6_tnl *t = netdev_priv(dev);
1966 struct net *net = dev_net(dev);
1967 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1968
1969 t->parms.proto = IPPROTO_IPV6;
1970
1971 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1972 return 0;
1973 }
1974
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1975 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1976 struct netlink_ext_ack *extack)
1977 {
1978 u8 proto;
1979
1980 if (!data || !data[IFLA_IPTUN_PROTO])
1981 return 0;
1982
1983 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1984 if (proto != IPPROTO_IPV6 &&
1985 proto != IPPROTO_IPIP &&
1986 proto != 0)
1987 return -EINVAL;
1988
1989 return 0;
1990 }
1991
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1992 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1993 struct __ip6_tnl_parm *parms)
1994 {
1995 memset(parms, 0, sizeof(*parms));
1996
1997 if (!data)
1998 return;
1999
2000 if (data[IFLA_IPTUN_LINK])
2001 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
2002
2003 if (data[IFLA_IPTUN_LOCAL])
2004 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
2005
2006 if (data[IFLA_IPTUN_REMOTE])
2007 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
2008
2009 if (data[IFLA_IPTUN_TTL])
2010 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
2011
2012 if (data[IFLA_IPTUN_ENCAP_LIMIT])
2013 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
2014
2015 if (data[IFLA_IPTUN_FLOWINFO])
2016 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
2017
2018 if (data[IFLA_IPTUN_FLAGS])
2019 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
2020
2021 if (data[IFLA_IPTUN_PROTO])
2022 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2023
2024 if (data[IFLA_IPTUN_COLLECT_METADATA])
2025 parms->collect_md = true;
2026
2027 if (data[IFLA_IPTUN_FWMARK])
2028 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2029 }
2030
ip6_tnl_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)2031 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
2032 struct ip_tunnel_encap *ipencap)
2033 {
2034 bool ret = false;
2035
2036 memset(ipencap, 0, sizeof(*ipencap));
2037
2038 if (!data)
2039 return ret;
2040
2041 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2042 ret = true;
2043 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2044 }
2045
2046 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2047 ret = true;
2048 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2049 }
2050
2051 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2052 ret = true;
2053 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2054 }
2055
2056 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2057 ret = true;
2058 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2059 }
2060
2061 return ret;
2062 }
2063
ip6_tnl_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2064 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2065 struct nlattr *tb[], struct nlattr *data[],
2066 struct netlink_ext_ack *extack)
2067 {
2068 struct net *net = dev_net(dev);
2069 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2070 struct ip_tunnel_encap ipencap;
2071 struct ip6_tnl *nt, *t;
2072 int err;
2073
2074 nt = netdev_priv(dev);
2075
2076 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2077 err = ip6_tnl_encap_setup(nt, &ipencap);
2078 if (err < 0)
2079 return err;
2080 }
2081
2082 ip6_tnl_netlink_parms(data, &nt->parms);
2083
2084 if (nt->parms.collect_md) {
2085 if (rtnl_dereference(ip6n->collect_md_tun))
2086 return -EEXIST;
2087 } else {
2088 t = ip6_tnl_locate(net, &nt->parms, 0);
2089 if (!IS_ERR(t))
2090 return -EEXIST;
2091 }
2092
2093 err = ip6_tnl_create2(dev);
2094 if (!err && tb[IFLA_MTU])
2095 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2096
2097 return err;
2098 }
2099
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2100 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2101 struct nlattr *data[],
2102 struct netlink_ext_ack *extack)
2103 {
2104 struct ip6_tnl *t = netdev_priv(dev);
2105 struct __ip6_tnl_parm p;
2106 struct net *net = t->net;
2107 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2108 struct ip_tunnel_encap ipencap;
2109
2110 if (dev == ip6n->fb_tnl_dev)
2111 return -EINVAL;
2112
2113 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2114 int err = ip6_tnl_encap_setup(t, &ipencap);
2115
2116 if (err < 0)
2117 return err;
2118 }
2119 ip6_tnl_netlink_parms(data, &p);
2120 if (p.collect_md)
2121 return -EINVAL;
2122
2123 t = ip6_tnl_locate(net, &p, 0);
2124 if (!IS_ERR(t)) {
2125 if (t->dev != dev)
2126 return -EEXIST;
2127 } else
2128 t = netdev_priv(dev);
2129
2130 return ip6_tnl_update(t, &p);
2131 }
2132
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2133 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2134 {
2135 struct net *net = dev_net(dev);
2136 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2137
2138 if (dev != ip6n->fb_tnl_dev)
2139 unregister_netdevice_queue(dev, head);
2140 }
2141
ip6_tnl_get_size(const struct net_device * dev)2142 static size_t ip6_tnl_get_size(const struct net_device *dev)
2143 {
2144 return
2145 /* IFLA_IPTUN_LINK */
2146 nla_total_size(4) +
2147 /* IFLA_IPTUN_LOCAL */
2148 nla_total_size(sizeof(struct in6_addr)) +
2149 /* IFLA_IPTUN_REMOTE */
2150 nla_total_size(sizeof(struct in6_addr)) +
2151 /* IFLA_IPTUN_TTL */
2152 nla_total_size(1) +
2153 /* IFLA_IPTUN_ENCAP_LIMIT */
2154 nla_total_size(1) +
2155 /* IFLA_IPTUN_FLOWINFO */
2156 nla_total_size(4) +
2157 /* IFLA_IPTUN_FLAGS */
2158 nla_total_size(4) +
2159 /* IFLA_IPTUN_PROTO */
2160 nla_total_size(1) +
2161 /* IFLA_IPTUN_ENCAP_TYPE */
2162 nla_total_size(2) +
2163 /* IFLA_IPTUN_ENCAP_FLAGS */
2164 nla_total_size(2) +
2165 /* IFLA_IPTUN_ENCAP_SPORT */
2166 nla_total_size(2) +
2167 /* IFLA_IPTUN_ENCAP_DPORT */
2168 nla_total_size(2) +
2169 /* IFLA_IPTUN_COLLECT_METADATA */
2170 nla_total_size(0) +
2171 /* IFLA_IPTUN_FWMARK */
2172 nla_total_size(4) +
2173 0;
2174 }
2175
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2176 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2177 {
2178 struct ip6_tnl *tunnel = netdev_priv(dev);
2179 struct __ip6_tnl_parm *parm = &tunnel->parms;
2180
2181 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2182 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2183 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2184 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2185 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2186 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2187 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2188 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2189 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2190 goto nla_put_failure;
2191
2192 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2193 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2194 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2195 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2196 goto nla_put_failure;
2197
2198 if (parm->collect_md)
2199 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2200 goto nla_put_failure;
2201
2202 return 0;
2203
2204 nla_put_failure:
2205 return -EMSGSIZE;
2206 }
2207
ip6_tnl_get_link_net(const struct net_device * dev)2208 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2209 {
2210 struct ip6_tnl *tunnel = netdev_priv(dev);
2211
2212 return tunnel->net;
2213 }
2214 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2215
2216 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2217 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2218 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2219 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2220 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2221 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2222 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2223 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2224 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2225 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2226 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2227 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2228 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2229 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2230 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2231 };
2232
2233 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2234 .kind = "ip6tnl",
2235 .maxtype = IFLA_IPTUN_MAX,
2236 .policy = ip6_tnl_policy,
2237 .priv_size = sizeof(struct ip6_tnl),
2238 .setup = ip6_tnl_dev_setup,
2239 .validate = ip6_tnl_validate,
2240 .newlink = ip6_tnl_newlink,
2241 .changelink = ip6_tnl_changelink,
2242 .dellink = ip6_tnl_dellink,
2243 .get_size = ip6_tnl_get_size,
2244 .fill_info = ip6_tnl_fill_info,
2245 .get_link_net = ip6_tnl_get_link_net,
2246 };
2247
2248 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2249 .handler = ip4ip6_rcv,
2250 .err_handler = ip4ip6_err,
2251 .priority = 1,
2252 };
2253
2254 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2255 .handler = ip6ip6_rcv,
2256 .err_handler = ip6ip6_err,
2257 .priority = 1,
2258 };
2259
2260 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2261 .handler = mplsip6_rcv,
2262 .err_handler = mplsip6_err,
2263 .priority = 1,
2264 };
2265
ip6_tnl_destroy_tunnels(struct net * net,struct list_head * list)2266 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2267 {
2268 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2269 struct net_device *dev, *aux;
2270 int h;
2271 struct ip6_tnl *t;
2272
2273 for_each_netdev_safe(net, dev, aux)
2274 if (dev->rtnl_link_ops == &ip6_link_ops)
2275 unregister_netdevice_queue(dev, list);
2276
2277 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2278 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2279 while (t) {
2280 /* If dev is in the same netns, it has already
2281 * been added to the list by the previous loop.
2282 */
2283 if (!net_eq(dev_net(t->dev), net))
2284 unregister_netdevice_queue(t->dev, list);
2285 t = rtnl_dereference(t->next);
2286 }
2287 }
2288
2289 t = rtnl_dereference(ip6n->tnls_wc[0]);
2290 while (t) {
2291 /* If dev is in the same netns, it has already
2292 * been added to the list by the previous loop.
2293 */
2294 if (!net_eq(dev_net(t->dev), net))
2295 unregister_netdevice_queue(t->dev, list);
2296 t = rtnl_dereference(t->next);
2297 }
2298 }
2299
ip6_tnl_init_net(struct net * net)2300 static int __net_init ip6_tnl_init_net(struct net *net)
2301 {
2302 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2303 struct ip6_tnl *t = NULL;
2304 int err;
2305
2306 ip6n->tnls[0] = ip6n->tnls_wc;
2307 ip6n->tnls[1] = ip6n->tnls_r_l;
2308
2309 if (!net_has_fallback_tunnels(net))
2310 return 0;
2311 err = -ENOMEM;
2312 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2313 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2314
2315 if (!ip6n->fb_tnl_dev)
2316 goto err_alloc_dev;
2317 dev_net_set(ip6n->fb_tnl_dev, net);
2318 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2319 /* FB netdevice is special: we have one, and only one per netns.
2320 * Allowing to move it to another netns is clearly unsafe.
2321 */
2322 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2323
2324 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2325 if (err < 0)
2326 goto err_register;
2327
2328 err = register_netdev(ip6n->fb_tnl_dev);
2329 if (err < 0)
2330 goto err_register;
2331
2332 t = netdev_priv(ip6n->fb_tnl_dev);
2333
2334 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2335 return 0;
2336
2337 err_register:
2338 free_netdev(ip6n->fb_tnl_dev);
2339 err_alloc_dev:
2340 return err;
2341 }
2342
ip6_tnl_exit_batch_net(struct list_head * net_list)2343 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2344 {
2345 struct net *net;
2346 LIST_HEAD(list);
2347
2348 rtnl_lock();
2349 list_for_each_entry(net, net_list, exit_list)
2350 ip6_tnl_destroy_tunnels(net, &list);
2351 unregister_netdevice_many(&list);
2352 rtnl_unlock();
2353 }
2354
2355 static struct pernet_operations ip6_tnl_net_ops = {
2356 .init = ip6_tnl_init_net,
2357 .exit_batch = ip6_tnl_exit_batch_net,
2358 .id = &ip6_tnl_net_id,
2359 .size = sizeof(struct ip6_tnl_net),
2360 };
2361
2362 /**
2363 * ip6_tunnel_init - register protocol and reserve needed resources
2364 *
2365 * Return: 0 on success
2366 **/
2367
ip6_tunnel_init(void)2368 static int __init ip6_tunnel_init(void)
2369 {
2370 int err;
2371
2372 if (!ipv6_mod_enabled())
2373 return -EOPNOTSUPP;
2374
2375 err = register_pernet_device(&ip6_tnl_net_ops);
2376 if (err < 0)
2377 goto out_pernet;
2378
2379 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2380 if (err < 0) {
2381 pr_err("%s: can't register ip4ip6\n", __func__);
2382 goto out_ip4ip6;
2383 }
2384
2385 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2386 if (err < 0) {
2387 pr_err("%s: can't register ip6ip6\n", __func__);
2388 goto out_ip6ip6;
2389 }
2390
2391 if (ip6_tnl_mpls_supported()) {
2392 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2393 if (err < 0) {
2394 pr_err("%s: can't register mplsip6\n", __func__);
2395 goto out_mplsip6;
2396 }
2397 }
2398
2399 err = rtnl_link_register(&ip6_link_ops);
2400 if (err < 0)
2401 goto rtnl_link_failed;
2402
2403 return 0;
2404
2405 rtnl_link_failed:
2406 if (ip6_tnl_mpls_supported())
2407 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2408 out_mplsip6:
2409 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2410 out_ip6ip6:
2411 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2412 out_ip4ip6:
2413 unregister_pernet_device(&ip6_tnl_net_ops);
2414 out_pernet:
2415 return err;
2416 }
2417
2418 /**
2419 * ip6_tunnel_cleanup - free resources and unregister protocol
2420 **/
2421
ip6_tunnel_cleanup(void)2422 static void __exit ip6_tunnel_cleanup(void)
2423 {
2424 rtnl_link_unregister(&ip6_link_ops);
2425 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2426 pr_info("%s: can't deregister ip4ip6\n", __func__);
2427
2428 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2429 pr_info("%s: can't deregister ip6ip6\n", __func__);
2430
2431 if (ip6_tnl_mpls_supported() &&
2432 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2433 pr_info("%s: can't deregister mplsip6\n", __func__);
2434 unregister_pernet_device(&ip6_tnl_net_ops);
2435 }
2436
2437 module_init(ip6_tunnel_init);
2438 module_exit(ip6_tunnel_cleanup);
2439