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 dev_hold(dev);
297 ip6_tnl_link(ip6n, t);
298 return 0;
299
300 out:
301 return err;
302 }
303
304 /**
305 * ip6_tnl_create - create a new tunnel
306 * @net: network namespace
307 * @p: tunnel parameters
308 *
309 * Description:
310 * Create tunnel matching given parameters.
311 *
312 * Return:
313 * created tunnel or error pointer
314 **/
315
ip6_tnl_create(struct net * net,struct __ip6_tnl_parm * p)316 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
317 {
318 struct net_device *dev;
319 struct ip6_tnl *t;
320 char name[IFNAMSIZ];
321 int err = -E2BIG;
322
323 if (p->name[0]) {
324 if (!dev_valid_name(p->name))
325 goto failed;
326 strlcpy(name, p->name, IFNAMSIZ);
327 } else {
328 sprintf(name, "ip6tnl%%d");
329 }
330 err = -ENOMEM;
331 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
332 ip6_tnl_dev_setup);
333 if (!dev)
334 goto failed;
335
336 dev_net_set(dev, net);
337
338 t = netdev_priv(dev);
339 t->parms = *p;
340 t->net = dev_net(dev);
341 err = ip6_tnl_create2(dev);
342 if (err < 0)
343 goto failed_free;
344
345 return t;
346
347 failed_free:
348 free_netdev(dev);
349 failed:
350 return ERR_PTR(err);
351 }
352
353 /**
354 * ip6_tnl_locate - find or create tunnel matching given parameters
355 * @net: network namespace
356 * @p: tunnel parameters
357 * @create: != 0 if allowed to create new tunnel if no match found
358 *
359 * Description:
360 * ip6_tnl_locate() first tries to locate an existing tunnel
361 * based on @parms. If this is unsuccessful, but @create is set a new
362 * tunnel device is created and registered for use.
363 *
364 * Return:
365 * matching tunnel or error pointer
366 **/
367
ip6_tnl_locate(struct net * net,struct __ip6_tnl_parm * p,int create)368 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
369 struct __ip6_tnl_parm *p, int create)
370 {
371 const struct in6_addr *remote = &p->raddr;
372 const struct in6_addr *local = &p->laddr;
373 struct ip6_tnl __rcu **tp;
374 struct ip6_tnl *t;
375 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
376
377 for (tp = ip6_tnl_bucket(ip6n, p);
378 (t = rtnl_dereference(*tp)) != NULL;
379 tp = &t->next) {
380 if (ipv6_addr_equal(local, &t->parms.laddr) &&
381 ipv6_addr_equal(remote, &t->parms.raddr) &&
382 p->link == t->parms.link) {
383 if (create)
384 return ERR_PTR(-EEXIST);
385
386 return t;
387 }
388 }
389 if (!create)
390 return ERR_PTR(-ENODEV);
391 return ip6_tnl_create(net, p);
392 }
393
394 /**
395 * ip6_tnl_dev_uninit - tunnel device uninitializer
396 * @dev: the device to be destroyed
397 *
398 * Description:
399 * ip6_tnl_dev_uninit() removes tunnel from its list
400 **/
401
402 static void
ip6_tnl_dev_uninit(struct net_device * dev)403 ip6_tnl_dev_uninit(struct net_device *dev)
404 {
405 struct ip6_tnl *t = netdev_priv(dev);
406 struct net *net = t->net;
407 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
408
409 if (dev == ip6n->fb_tnl_dev)
410 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
411 else
412 ip6_tnl_unlink(ip6n, t);
413 dst_cache_reset(&t->dst_cache);
414 dev_put(dev);
415 }
416
417 /**
418 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
419 * @skb: received socket buffer
420 *
421 * Return:
422 * 0 if none was found,
423 * else index to encapsulation limit
424 **/
425
ip6_tnl_parse_tlv_enc_lim(struct sk_buff * skb,__u8 * raw)426 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
427 {
428 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
429 unsigned int nhoff = raw - skb->data;
430 unsigned int off = nhoff + sizeof(*ipv6h);
431 u8 next, nexthdr = ipv6h->nexthdr;
432
433 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
434 struct ipv6_opt_hdr *hdr;
435 u16 optlen;
436
437 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
438 break;
439
440 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
441 if (nexthdr == NEXTHDR_FRAGMENT) {
442 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
443 if (frag_hdr->frag_off)
444 break;
445 optlen = 8;
446 } else if (nexthdr == NEXTHDR_AUTH) {
447 optlen = ipv6_authlen(hdr);
448 } else {
449 optlen = ipv6_optlen(hdr);
450 }
451 /* cache hdr->nexthdr, since pskb_may_pull() might
452 * invalidate hdr
453 */
454 next = hdr->nexthdr;
455 if (nexthdr == NEXTHDR_DEST) {
456 u16 i = 2;
457
458 /* Remember : hdr is no longer valid at this point. */
459 if (!pskb_may_pull(skb, off + optlen))
460 break;
461
462 while (1) {
463 struct ipv6_tlv_tnl_enc_lim *tel;
464
465 /* No more room for encapsulation limit */
466 if (i + sizeof(*tel) > optlen)
467 break;
468
469 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
470 /* return index of option if found and valid */
471 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
472 tel->length == 1)
473 return i + off - nhoff;
474 /* else jump to next option */
475 if (tel->type)
476 i += tel->length + 2;
477 else
478 i++;
479 }
480 }
481 nexthdr = next;
482 off += optlen;
483 }
484 return 0;
485 }
486 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
487
488 /**
489 * ip6_tnl_err - tunnel error handler
490 *
491 * Description:
492 * ip6_tnl_err() should handle errors in the tunnel according
493 * to the specifications in RFC 2473.
494 **/
495
496 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)497 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
498 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
499 {
500 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
501 struct net *net = dev_net(skb->dev);
502 u8 rel_type = ICMPV6_DEST_UNREACH;
503 u8 rel_code = ICMPV6_ADDR_UNREACH;
504 __u32 rel_info = 0;
505 struct ip6_tnl *t;
506 int err = -ENOENT;
507 int rel_msg = 0;
508 u8 tproto;
509 __u16 len;
510
511 /* If the packet doesn't contain the original IPv6 header we are
512 in trouble since we might need the source address for further
513 processing of the error. */
514
515 rcu_read_lock();
516 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
517 if (!t)
518 goto out;
519
520 tproto = READ_ONCE(t->parms.proto);
521 if (tproto != ipproto && tproto != 0)
522 goto out;
523
524 err = 0;
525
526 switch (*type) {
527 case ICMPV6_DEST_UNREACH:
528 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
529 t->parms.name);
530 rel_msg = 1;
531 break;
532 case ICMPV6_TIME_EXCEED:
533 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
534 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
535 t->parms.name);
536 rel_msg = 1;
537 }
538 break;
539 case ICMPV6_PARAMPROB: {
540 struct ipv6_tlv_tnl_enc_lim *tel;
541 __u32 teli;
542
543 teli = 0;
544 if ((*code) == ICMPV6_HDR_FIELD)
545 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
546
547 if (teli && teli == *info - 2) {
548 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
549 if (tel->encap_limit == 0) {
550 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
551 t->parms.name);
552 rel_msg = 1;
553 }
554 } else {
555 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
556 t->parms.name);
557 }
558 break;
559 }
560 case ICMPV6_PKT_TOOBIG: {
561 __u32 mtu;
562
563 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
564 sock_net_uid(net, NULL));
565 mtu = *info - offset;
566 if (mtu < IPV6_MIN_MTU)
567 mtu = IPV6_MIN_MTU;
568 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
569 if (len > mtu) {
570 rel_type = ICMPV6_PKT_TOOBIG;
571 rel_code = 0;
572 rel_info = mtu;
573 rel_msg = 1;
574 }
575 break;
576 }
577 case NDISC_REDIRECT:
578 ip6_redirect(skb, net, skb->dev->ifindex, 0,
579 sock_net_uid(net, NULL));
580 break;
581 }
582
583 *type = rel_type;
584 *code = rel_code;
585 *info = rel_info;
586 *msg = rel_msg;
587
588 out:
589 rcu_read_unlock();
590 return err;
591 }
592
593 static int
ip4ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)594 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
595 u8 type, u8 code, int offset, __be32 info)
596 {
597 __u32 rel_info = ntohl(info);
598 const struct iphdr *eiph;
599 struct sk_buff *skb2;
600 int err, rel_msg = 0;
601 u8 rel_type = type;
602 u8 rel_code = code;
603 struct rtable *rt;
604 struct flowi4 fl4;
605
606 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
607 &rel_msg, &rel_info, offset);
608 if (err < 0)
609 return err;
610
611 if (rel_msg == 0)
612 return 0;
613
614 switch (rel_type) {
615 case ICMPV6_DEST_UNREACH:
616 if (rel_code != ICMPV6_ADDR_UNREACH)
617 return 0;
618 rel_type = ICMP_DEST_UNREACH;
619 rel_code = ICMP_HOST_UNREACH;
620 break;
621 case ICMPV6_PKT_TOOBIG:
622 if (rel_code != 0)
623 return 0;
624 rel_type = ICMP_DEST_UNREACH;
625 rel_code = ICMP_FRAG_NEEDED;
626 break;
627 default:
628 return 0;
629 }
630
631 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
632 return 0;
633
634 skb2 = skb_clone(skb, GFP_ATOMIC);
635 if (!skb2)
636 return 0;
637
638 skb_dst_drop(skb2);
639
640 skb_pull(skb2, offset);
641 skb_reset_network_header(skb2);
642 eiph = ip_hdr(skb2);
643
644 /* Try to guess incoming interface */
645 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
646 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
647 if (IS_ERR(rt))
648 goto out;
649
650 skb2->dev = rt->dst.dev;
651 ip_rt_put(rt);
652
653 /* route "incoming" packet */
654 if (rt->rt_flags & RTCF_LOCAL) {
655 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
656 eiph->daddr, eiph->saddr, 0, 0,
657 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
658 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
659 if (!IS_ERR(rt))
660 ip_rt_put(rt);
661 goto out;
662 }
663 skb_dst_set(skb2, &rt->dst);
664 } else {
665 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
666 skb2->dev) ||
667 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
668 goto out;
669 }
670
671 /* change mtu on this route */
672 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
673 if (rel_info > dst_mtu(skb_dst(skb2)))
674 goto out;
675
676 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
677 }
678
679 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
680
681 out:
682 kfree_skb(skb2);
683 return 0;
684 }
685
686 static int
ip6ip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)687 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
688 u8 type, u8 code, int offset, __be32 info)
689 {
690 __u32 rel_info = ntohl(info);
691 int err, rel_msg = 0;
692 u8 rel_type = type;
693 u8 rel_code = code;
694
695 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
696 &rel_msg, &rel_info, offset);
697 if (err < 0)
698 return err;
699
700 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
701 struct rt6_info *rt;
702 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
703
704 if (!skb2)
705 return 0;
706
707 skb_dst_drop(skb2);
708 skb_pull(skb2, offset);
709 skb_reset_network_header(skb2);
710
711 /* Try to guess incoming interface */
712 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
713 NULL, 0, skb2, 0);
714
715 if (rt && rt->dst.dev)
716 skb2->dev = rt->dst.dev;
717
718 icmpv6_send(skb2, rel_type, rel_code, rel_info);
719
720 ip6_rt_put(rt);
721
722 kfree_skb(skb2);
723 }
724
725 return 0;
726 }
727
728 static int
mplsip6_err(struct sk_buff * skb,struct inet6_skb_parm * opt,u8 type,u8 code,int offset,__be32 info)729 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
730 u8 type, u8 code, int offset, __be32 info)
731 {
732 __u32 rel_info = ntohl(info);
733 int err, rel_msg = 0;
734 u8 rel_type = type;
735 u8 rel_code = code;
736
737 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
738 &rel_msg, &rel_info, offset);
739 return err;
740 }
741
ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)742 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
743 const struct ipv6hdr *ipv6h,
744 struct sk_buff *skb)
745 {
746 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
747
748 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
749 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
750
751 return IP6_ECN_decapsulate(ipv6h, skb);
752 }
753
ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)754 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
755 const struct ipv6hdr *ipv6h,
756 struct sk_buff *skb)
757 {
758 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
759 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
760
761 return IP6_ECN_decapsulate(ipv6h, skb);
762 }
763
mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl * t,const struct ipv6hdr * ipv6h,struct sk_buff * skb)764 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
765 const struct ipv6hdr *ipv6h,
766 struct sk_buff *skb)
767 {
768 /* ECN is not supported in AF_MPLS */
769 return 0;
770 }
771
ip6_tnl_get_cap(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)772 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
773 const struct in6_addr *laddr,
774 const struct in6_addr *raddr)
775 {
776 struct __ip6_tnl_parm *p = &t->parms;
777 int ltype = ipv6_addr_type(laddr);
778 int rtype = ipv6_addr_type(raddr);
779 __u32 flags = 0;
780
781 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
782 flags = IP6_TNL_F_CAP_PER_PACKET;
783 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
784 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
785 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
786 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
787 if (ltype&IPV6_ADDR_UNICAST)
788 flags |= IP6_TNL_F_CAP_XMIT;
789 if (rtype&IPV6_ADDR_UNICAST)
790 flags |= IP6_TNL_F_CAP_RCV;
791 }
792 return flags;
793 }
794 EXPORT_SYMBOL(ip6_tnl_get_cap);
795
796 /* called with rcu_read_lock() */
ip6_tnl_rcv_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)797 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
798 const struct in6_addr *laddr,
799 const struct in6_addr *raddr)
800 {
801 struct __ip6_tnl_parm *p = &t->parms;
802 int ret = 0;
803 struct net *net = t->net;
804
805 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
806 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
807 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
808 struct net_device *ldev = NULL;
809
810 if (p->link)
811 ldev = dev_get_by_index_rcu(net, p->link);
812
813 if ((ipv6_addr_is_multicast(laddr) ||
814 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
815 0, IFA_F_TENTATIVE))) &&
816 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
817 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
818 0, IFA_F_TENTATIVE))))
819 ret = 1;
820 }
821 return ret;
822 }
823 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
824
__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)825 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
826 const struct tnl_ptk_info *tpi,
827 struct metadata_dst *tun_dst,
828 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
829 const struct ipv6hdr *ipv6h,
830 struct sk_buff *skb),
831 bool log_ecn_err)
832 {
833 struct pcpu_sw_netstats *tstats;
834 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
835 int err;
836
837 if ((!(tpi->flags & TUNNEL_CSUM) &&
838 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
839 ((tpi->flags & TUNNEL_CSUM) &&
840 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
841 tunnel->dev->stats.rx_crc_errors++;
842 tunnel->dev->stats.rx_errors++;
843 goto drop;
844 }
845
846 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
847 if (!(tpi->flags & TUNNEL_SEQ) ||
848 (tunnel->i_seqno &&
849 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
850 tunnel->dev->stats.rx_fifo_errors++;
851 tunnel->dev->stats.rx_errors++;
852 goto drop;
853 }
854 tunnel->i_seqno = ntohl(tpi->seq) + 1;
855 }
856
857 skb->protocol = tpi->proto;
858
859 /* Warning: All skb pointers will be invalidated! */
860 if (tunnel->dev->type == ARPHRD_ETHER) {
861 if (!pskb_may_pull(skb, ETH_HLEN)) {
862 tunnel->dev->stats.rx_length_errors++;
863 tunnel->dev->stats.rx_errors++;
864 goto drop;
865 }
866
867 ipv6h = ipv6_hdr(skb);
868 skb->protocol = eth_type_trans(skb, tunnel->dev);
869 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
870 } else {
871 skb->dev = tunnel->dev;
872 }
873
874 skb_reset_network_header(skb);
875 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
876
877 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
878
879 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
880 if (unlikely(err)) {
881 if (log_ecn_err)
882 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
883 &ipv6h->saddr,
884 ipv6_get_dsfield(ipv6h));
885 if (err > 1) {
886 ++tunnel->dev->stats.rx_frame_errors;
887 ++tunnel->dev->stats.rx_errors;
888 goto drop;
889 }
890 }
891
892 tstats = this_cpu_ptr(tunnel->dev->tstats);
893 u64_stats_update_begin(&tstats->syncp);
894 tstats->rx_packets++;
895 tstats->rx_bytes += skb->len;
896 u64_stats_update_end(&tstats->syncp);
897
898 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
899
900 if (tun_dst)
901 skb_dst_set(skb, (struct dst_entry *)tun_dst);
902
903 gro_cells_receive(&tunnel->gro_cells, skb);
904 return 0;
905
906 drop:
907 if (tun_dst)
908 dst_release((struct dst_entry *)tun_dst);
909 kfree_skb(skb);
910 return 0;
911 }
912
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)913 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
914 const struct tnl_ptk_info *tpi,
915 struct metadata_dst *tun_dst,
916 bool log_ecn_err)
917 {
918 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
919 const struct ipv6hdr *ipv6h,
920 struct sk_buff *skb);
921
922 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
923 if (tpi->proto == htons(ETH_P_IP))
924 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
925
926 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
927 log_ecn_err);
928 }
929 EXPORT_SYMBOL(ip6_tnl_rcv);
930
931 static const struct tnl_ptk_info tpi_v6 = {
932 /* no tunnel info required for ipxip6. */
933 .proto = htons(ETH_P_IPV6),
934 };
935
936 static const struct tnl_ptk_info tpi_v4 = {
937 /* no tunnel info required for ipxip6. */
938 .proto = htons(ETH_P_IP),
939 };
940
941 static const struct tnl_ptk_info tpi_mpls = {
942 /* no tunnel info required for mplsip6. */
943 .proto = htons(ETH_P_MPLS_UC),
944 };
945
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))946 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
947 const struct tnl_ptk_info *tpi,
948 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
949 const struct ipv6hdr *ipv6h,
950 struct sk_buff *skb))
951 {
952 struct ip6_tnl *t;
953 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
954 struct metadata_dst *tun_dst = NULL;
955 int ret = -1;
956
957 rcu_read_lock();
958 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
959
960 if (t) {
961 u8 tproto = READ_ONCE(t->parms.proto);
962
963 if (tproto != ipproto && tproto != 0)
964 goto drop;
965 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
966 goto drop;
967 ipv6h = ipv6_hdr(skb);
968 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
969 goto drop;
970 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
971 goto drop;
972 if (t->parms.collect_md) {
973 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
974 if (!tun_dst)
975 goto drop;
976 }
977 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
978 log_ecn_error);
979 }
980
981 rcu_read_unlock();
982
983 return ret;
984
985 drop:
986 rcu_read_unlock();
987 kfree_skb(skb);
988 return 0;
989 }
990
ip4ip6_rcv(struct sk_buff * skb)991 static int ip4ip6_rcv(struct sk_buff *skb)
992 {
993 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
994 ip4ip6_dscp_ecn_decapsulate);
995 }
996
ip6ip6_rcv(struct sk_buff * skb)997 static int ip6ip6_rcv(struct sk_buff *skb)
998 {
999 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
1000 ip6ip6_dscp_ecn_decapsulate);
1001 }
1002
mplsip6_rcv(struct sk_buff * skb)1003 static int mplsip6_rcv(struct sk_buff *skb)
1004 {
1005 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
1006 mplsip6_dscp_ecn_decapsulate);
1007 }
1008
1009 struct ipv6_tel_txoption {
1010 struct ipv6_txoptions ops;
1011 __u8 dst_opt[8];
1012 };
1013
init_tel_txopt(struct ipv6_tel_txoption * opt,__u8 encap_limit)1014 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
1015 {
1016 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
1017
1018 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
1019 opt->dst_opt[3] = 1;
1020 opt->dst_opt[4] = encap_limit;
1021 opt->dst_opt[5] = IPV6_TLV_PADN;
1022 opt->dst_opt[6] = 1;
1023
1024 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1025 opt->ops.opt_nflen = 8;
1026 }
1027
1028 /**
1029 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1030 * @t: the outgoing tunnel device
1031 * @hdr: IPv6 header from the incoming packet
1032 *
1033 * Description:
1034 * Avoid trivial tunneling loop by checking that tunnel exit-point
1035 * doesn't match source of incoming packet.
1036 *
1037 * Return:
1038 * 1 if conflict,
1039 * 0 else
1040 **/
1041
1042 static inline bool
ip6_tnl_addr_conflict(const struct ip6_tnl * t,const struct ipv6hdr * hdr)1043 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1044 {
1045 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1046 }
1047
ip6_tnl_xmit_ctl(struct ip6_tnl * t,const struct in6_addr * laddr,const struct in6_addr * raddr)1048 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1049 const struct in6_addr *laddr,
1050 const struct in6_addr *raddr)
1051 {
1052 struct __ip6_tnl_parm *p = &t->parms;
1053 int ret = 0;
1054 struct net *net = t->net;
1055
1056 if (t->parms.collect_md)
1057 return 1;
1058
1059 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1060 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1061 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1062 struct net_device *ldev = NULL;
1063
1064 rcu_read_lock();
1065 if (p->link)
1066 ldev = dev_get_by_index_rcu(net, p->link);
1067
1068 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1069 0, IFA_F_TENTATIVE)))
1070 pr_warn("%s xmit: Local address not yet configured!\n",
1071 p->name);
1072 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1073 !ipv6_addr_is_multicast(raddr) &&
1074 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1075 true, 0, IFA_F_TENTATIVE)))
1076 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1077 p->name);
1078 else
1079 ret = 1;
1080 rcu_read_unlock();
1081 }
1082 return ret;
1083 }
1084 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1085
1086 /**
1087 * ip6_tnl_xmit - encapsulate packet and send
1088 * @skb: the outgoing socket buffer
1089 * @dev: the outgoing tunnel device
1090 * @dsfield: dscp code for outer header
1091 * @fl6: flow of tunneled packet
1092 * @encap_limit: encapsulation limit
1093 * @pmtu: Path MTU is stored if packet is too big
1094 * @proto: next header value
1095 *
1096 * Description:
1097 * Build new header and do some sanity checks on the packet before sending
1098 * it.
1099 *
1100 * Return:
1101 * 0 on success
1102 * -1 fail
1103 * %-EMSGSIZE message too big. return mtu in this case.
1104 **/
1105
ip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,__u8 dsfield,struct flowi6 * fl6,int encap_limit,__u32 * pmtu,__u8 proto)1106 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1107 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1108 __u8 proto)
1109 {
1110 struct ip6_tnl *t = netdev_priv(dev);
1111 struct net *net = t->net;
1112 struct net_device_stats *stats = &t->dev->stats;
1113 struct ipv6hdr *ipv6h;
1114 struct ipv6_tel_txoption opt;
1115 struct dst_entry *dst = NULL, *ndst = NULL;
1116 struct net_device *tdev;
1117 int mtu;
1118 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1119 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1120 unsigned int max_headroom = psh_hlen;
1121 bool use_cache = false;
1122 u8 hop_limit;
1123 int err = -1;
1124
1125 if (t->parms.collect_md) {
1126 hop_limit = skb_tunnel_info(skb)->key.ttl;
1127 goto route_lookup;
1128 } else {
1129 hop_limit = t->parms.hop_limit;
1130 }
1131
1132 /* NBMA tunnel */
1133 if (ipv6_addr_any(&t->parms.raddr)) {
1134 if (skb->protocol == htons(ETH_P_IPV6)) {
1135 struct in6_addr *addr6;
1136 struct neighbour *neigh;
1137 int addr_type;
1138
1139 if (!skb_dst(skb))
1140 goto tx_err_link_failure;
1141
1142 neigh = dst_neigh_lookup(skb_dst(skb),
1143 &ipv6_hdr(skb)->daddr);
1144 if (!neigh)
1145 goto tx_err_link_failure;
1146
1147 addr6 = (struct in6_addr *)&neigh->primary_key;
1148 addr_type = ipv6_addr_type(addr6);
1149
1150 if (addr_type == IPV6_ADDR_ANY)
1151 addr6 = &ipv6_hdr(skb)->daddr;
1152
1153 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1154 neigh_release(neigh);
1155 }
1156 } else if (t->parms.proto != 0 && !(t->parms.flags &
1157 (IP6_TNL_F_USE_ORIG_TCLASS |
1158 IP6_TNL_F_USE_ORIG_FWMARK))) {
1159 /* enable the cache only if neither the outer protocol nor the
1160 * routing decision depends on the current inner header value
1161 */
1162 use_cache = true;
1163 }
1164
1165 if (use_cache)
1166 dst = dst_cache_get(&t->dst_cache);
1167
1168 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1169 goto tx_err_link_failure;
1170
1171 if (!dst) {
1172 route_lookup:
1173 /* add dsfield to flowlabel for route lookup */
1174 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1175
1176 dst = ip6_route_output(net, NULL, fl6);
1177
1178 if (dst->error)
1179 goto tx_err_link_failure;
1180 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1181 if (IS_ERR(dst)) {
1182 err = PTR_ERR(dst);
1183 dst = NULL;
1184 goto tx_err_link_failure;
1185 }
1186 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1187 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1188 &fl6->daddr, 0, &fl6->saddr))
1189 goto tx_err_link_failure;
1190 ndst = dst;
1191 }
1192
1193 tdev = dst->dev;
1194
1195 if (tdev == dev) {
1196 stats->collisions++;
1197 net_warn_ratelimited("%s: Local routing loop detected!\n",
1198 t->parms.name);
1199 goto tx_err_dst_release;
1200 }
1201 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1202 if (encap_limit >= 0) {
1203 max_headroom += 8;
1204 mtu -= 8;
1205 }
1206 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1207 IPV6_MIN_MTU : IPV4_MIN_MTU);
1208
1209 skb_dst_update_pmtu_no_confirm(skb, mtu);
1210 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1211 *pmtu = mtu;
1212 err = -EMSGSIZE;
1213 goto tx_err_dst_release;
1214 }
1215
1216 if (t->err_count > 0) {
1217 if (time_before(jiffies,
1218 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1219 t->err_count--;
1220
1221 dst_link_failure(skb);
1222 } else {
1223 t->err_count = 0;
1224 }
1225 }
1226
1227 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1228
1229 /*
1230 * Okay, now see if we can stuff it in the buffer as-is.
1231 */
1232 max_headroom += LL_RESERVED_SPACE(tdev);
1233
1234 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1235 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1236 struct sk_buff *new_skb;
1237
1238 new_skb = skb_realloc_headroom(skb, max_headroom);
1239 if (!new_skb)
1240 goto tx_err_dst_release;
1241
1242 if (skb->sk)
1243 skb_set_owner_w(new_skb, skb->sk);
1244 consume_skb(skb);
1245 skb = new_skb;
1246 }
1247
1248 if (t->parms.collect_md) {
1249 if (t->encap.type != TUNNEL_ENCAP_NONE)
1250 goto tx_err_dst_release;
1251 } else {
1252 if (use_cache && ndst)
1253 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1254 }
1255 skb_dst_set(skb, dst);
1256
1257 if (hop_limit == 0) {
1258 if (skb->protocol == htons(ETH_P_IP))
1259 hop_limit = ip_hdr(skb)->ttl;
1260 else if (skb->protocol == htons(ETH_P_IPV6))
1261 hop_limit = ipv6_hdr(skb)->hop_limit;
1262 else
1263 hop_limit = ip6_dst_hoplimit(dst);
1264 }
1265
1266 /* Calculate max headroom for all the headers and adjust
1267 * needed_headroom if necessary.
1268 */
1269 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1270 + dst->header_len + t->hlen;
1271 if (max_headroom > dev->needed_headroom)
1272 dev->needed_headroom = max_headroom;
1273
1274 skb_set_inner_ipproto(skb, proto);
1275
1276 err = ip6_tnl_encap(skb, t, &proto, fl6);
1277 if (err)
1278 return err;
1279
1280 if (encap_limit >= 0) {
1281 init_tel_txopt(&opt, encap_limit);
1282 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1283 }
1284
1285 skb_push(skb, sizeof(struct ipv6hdr));
1286 skb_reset_network_header(skb);
1287 ipv6h = ipv6_hdr(skb);
1288 ip6_flow_hdr(ipv6h, dsfield,
1289 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1290 ipv6h->hop_limit = hop_limit;
1291 ipv6h->nexthdr = proto;
1292 ipv6h->saddr = fl6->saddr;
1293 ipv6h->daddr = fl6->daddr;
1294 ip6tunnel_xmit(NULL, skb, dev);
1295 return 0;
1296 tx_err_link_failure:
1297 stats->tx_carrier_errors++;
1298 dst_link_failure(skb);
1299 tx_err_dst_release:
1300 dst_release(dst);
1301 return err;
1302 }
1303 EXPORT_SYMBOL(ip6_tnl_xmit);
1304
1305 static inline int
ipxip6_tnl_xmit(struct sk_buff * skb,struct net_device * dev,u8 protocol)1306 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1307 u8 protocol)
1308 {
1309 struct ip6_tnl *t = netdev_priv(dev);
1310 struct ipv6hdr *ipv6h;
1311 const struct iphdr *iph;
1312 int encap_limit = -1;
1313 __u16 offset;
1314 struct flowi6 fl6;
1315 __u8 dsfield, orig_dsfield;
1316 __u32 mtu;
1317 u8 tproto;
1318 int err;
1319
1320 tproto = READ_ONCE(t->parms.proto);
1321 if (tproto != protocol && tproto != 0)
1322 return -1;
1323
1324 if (t->parms.collect_md) {
1325 struct ip_tunnel_info *tun_info;
1326 const struct ip_tunnel_key *key;
1327
1328 tun_info = skb_tunnel_info(skb);
1329 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1330 ip_tunnel_info_af(tun_info) != AF_INET6))
1331 return -1;
1332 key = &tun_info->key;
1333 memset(&fl6, 0, sizeof(fl6));
1334 fl6.flowi6_proto = protocol;
1335 fl6.saddr = key->u.ipv6.src;
1336 fl6.daddr = key->u.ipv6.dst;
1337 fl6.flowlabel = key->label;
1338 dsfield = key->tos;
1339 switch (protocol) {
1340 case IPPROTO_IPIP:
1341 iph = ip_hdr(skb);
1342 orig_dsfield = ipv4_get_dsfield(iph);
1343 break;
1344 case IPPROTO_IPV6:
1345 ipv6h = ipv6_hdr(skb);
1346 orig_dsfield = ipv6_get_dsfield(ipv6h);
1347 break;
1348 default:
1349 orig_dsfield = dsfield;
1350 break;
1351 }
1352 } else {
1353 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1354 encap_limit = t->parms.encap_limit;
1355 if (protocol == IPPROTO_IPV6) {
1356 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1357 skb_network_header(skb));
1358 /* ip6_tnl_parse_tlv_enc_lim() might have
1359 * reallocated skb->head
1360 */
1361 if (offset > 0) {
1362 struct ipv6_tlv_tnl_enc_lim *tel;
1363
1364 tel = (void *)&skb_network_header(skb)[offset];
1365 if (tel->encap_limit == 0) {
1366 icmpv6_send(skb, ICMPV6_PARAMPROB,
1367 ICMPV6_HDR_FIELD, offset + 2);
1368 return -1;
1369 }
1370 encap_limit = tel->encap_limit - 1;
1371 }
1372 }
1373
1374 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1375 fl6.flowi6_proto = protocol;
1376
1377 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1378 fl6.flowi6_mark = skb->mark;
1379 else
1380 fl6.flowi6_mark = t->parms.fwmark;
1381 switch (protocol) {
1382 case IPPROTO_IPIP:
1383 iph = ip_hdr(skb);
1384 orig_dsfield = ipv4_get_dsfield(iph);
1385 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1386 dsfield = orig_dsfield;
1387 else
1388 dsfield = ip6_tclass(t->parms.flowinfo);
1389 break;
1390 case IPPROTO_IPV6:
1391 ipv6h = ipv6_hdr(skb);
1392 orig_dsfield = ipv6_get_dsfield(ipv6h);
1393 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1394 dsfield = orig_dsfield;
1395 else
1396 dsfield = ip6_tclass(t->parms.flowinfo);
1397 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1398 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1399 break;
1400 default:
1401 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1402 break;
1403 }
1404 }
1405
1406 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1407 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1408
1409 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1410 return -1;
1411
1412 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1413 protocol);
1414 if (err != 0) {
1415 /* XXX: send ICMP error even if DF is not set. */
1416 if (err == -EMSGSIZE)
1417 switch (protocol) {
1418 case IPPROTO_IPIP:
1419 icmp_send(skb, ICMP_DEST_UNREACH,
1420 ICMP_FRAG_NEEDED, htonl(mtu));
1421 break;
1422 case IPPROTO_IPV6:
1423 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1424 break;
1425 default:
1426 break;
1427 }
1428 return -1;
1429 }
1430
1431 return 0;
1432 }
1433
1434 static netdev_tx_t
ip6_tnl_start_xmit(struct sk_buff * skb,struct net_device * dev)1435 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1436 {
1437 struct ip6_tnl *t = netdev_priv(dev);
1438 struct net_device_stats *stats = &t->dev->stats;
1439 u8 ipproto;
1440 int ret;
1441
1442 if (!pskb_inet_may_pull(skb))
1443 goto tx_err;
1444
1445 switch (skb->protocol) {
1446 case htons(ETH_P_IP):
1447 ipproto = IPPROTO_IPIP;
1448 break;
1449 case htons(ETH_P_IPV6):
1450 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1451 goto tx_err;
1452 ipproto = IPPROTO_IPV6;
1453 break;
1454 case htons(ETH_P_MPLS_UC):
1455 ipproto = IPPROTO_MPLS;
1456 break;
1457 default:
1458 goto tx_err;
1459 }
1460
1461 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1462 if (ret < 0)
1463 goto tx_err;
1464
1465 return NETDEV_TX_OK;
1466
1467 tx_err:
1468 stats->tx_errors++;
1469 stats->tx_dropped++;
1470 kfree_skb(skb);
1471 return NETDEV_TX_OK;
1472 }
1473
ip6_tnl_link_config(struct ip6_tnl * t)1474 static void ip6_tnl_link_config(struct ip6_tnl *t)
1475 {
1476 struct net_device *dev = t->dev;
1477 struct net_device *tdev = NULL;
1478 struct __ip6_tnl_parm *p = &t->parms;
1479 struct flowi6 *fl6 = &t->fl.u.ip6;
1480 unsigned int mtu;
1481 int t_hlen;
1482
1483 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1484 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1485
1486 /* Set up flowi template */
1487 fl6->saddr = p->laddr;
1488 fl6->daddr = p->raddr;
1489 fl6->flowi6_oif = p->link;
1490 fl6->flowlabel = 0;
1491
1492 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1493 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1494 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1495 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1496
1497 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1498 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1499
1500 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1501 dev->flags |= IFF_POINTOPOINT;
1502 else
1503 dev->flags &= ~IFF_POINTOPOINT;
1504
1505 t->tun_hlen = 0;
1506 t->hlen = t->encap_hlen + t->tun_hlen;
1507 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1508
1509 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1510 int strict = (ipv6_addr_type(&p->raddr) &
1511 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1512
1513 struct rt6_info *rt = rt6_lookup(t->net,
1514 &p->raddr, &p->laddr,
1515 p->link, NULL, strict);
1516 if (rt) {
1517 tdev = rt->dst.dev;
1518 ip6_rt_put(rt);
1519 }
1520
1521 if (!tdev && p->link)
1522 tdev = __dev_get_by_index(t->net, p->link);
1523
1524 if (tdev) {
1525 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1526 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1527
1528 dev->mtu = mtu - t_hlen;
1529 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1530 dev->mtu -= 8;
1531
1532 if (dev->mtu < IPV6_MIN_MTU)
1533 dev->mtu = IPV6_MIN_MTU;
1534 }
1535 }
1536 }
1537
1538 /**
1539 * ip6_tnl_change - update the tunnel parameters
1540 * @t: tunnel to be changed
1541 * @p: tunnel configuration parameters
1542 *
1543 * Description:
1544 * ip6_tnl_change() updates the tunnel parameters
1545 **/
1546
1547 static int
ip6_tnl_change(struct ip6_tnl * t,const struct __ip6_tnl_parm * p)1548 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1549 {
1550 t->parms.laddr = p->laddr;
1551 t->parms.raddr = p->raddr;
1552 t->parms.flags = p->flags;
1553 t->parms.hop_limit = p->hop_limit;
1554 t->parms.encap_limit = p->encap_limit;
1555 t->parms.flowinfo = p->flowinfo;
1556 t->parms.link = p->link;
1557 t->parms.proto = p->proto;
1558 t->parms.fwmark = p->fwmark;
1559 dst_cache_reset(&t->dst_cache);
1560 ip6_tnl_link_config(t);
1561 return 0;
1562 }
1563
ip6_tnl_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1564 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1565 {
1566 struct net *net = t->net;
1567 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1568 int err;
1569
1570 ip6_tnl_unlink(ip6n, t);
1571 synchronize_net();
1572 err = ip6_tnl_change(t, p);
1573 ip6_tnl_link(ip6n, t);
1574 netdev_state_change(t->dev);
1575 return err;
1576 }
1577
ip6_tnl0_update(struct ip6_tnl * t,struct __ip6_tnl_parm * p)1578 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1579 {
1580 /* for default tnl0 device allow to change only the proto */
1581 t->parms.proto = p->proto;
1582 netdev_state_change(t->dev);
1583 return 0;
1584 }
1585
1586 static void
ip6_tnl_parm_from_user(struct __ip6_tnl_parm * p,const struct ip6_tnl_parm * u)1587 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1588 {
1589 p->laddr = u->laddr;
1590 p->raddr = u->raddr;
1591 p->flags = u->flags;
1592 p->hop_limit = u->hop_limit;
1593 p->encap_limit = u->encap_limit;
1594 p->flowinfo = u->flowinfo;
1595 p->link = u->link;
1596 p->proto = u->proto;
1597 memcpy(p->name, u->name, sizeof(u->name));
1598 }
1599
1600 static void
ip6_tnl_parm_to_user(struct ip6_tnl_parm * u,const struct __ip6_tnl_parm * p)1601 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1602 {
1603 u->laddr = p->laddr;
1604 u->raddr = p->raddr;
1605 u->flags = p->flags;
1606 u->hop_limit = p->hop_limit;
1607 u->encap_limit = p->encap_limit;
1608 u->flowinfo = p->flowinfo;
1609 u->link = p->link;
1610 u->proto = p->proto;
1611 memcpy(u->name, p->name, sizeof(u->name));
1612 }
1613
1614 /**
1615 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1616 * @dev: virtual device associated with tunnel
1617 * @ifr: parameters passed from userspace
1618 * @cmd: command to be performed
1619 *
1620 * Description:
1621 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1622 * from userspace.
1623 *
1624 * The possible commands are the following:
1625 * %SIOCGETTUNNEL: get tunnel parameters for device
1626 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1627 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1628 * %SIOCDELTUNNEL: delete tunnel
1629 *
1630 * The fallback device "ip6tnl0", created during module
1631 * initialization, can be used for creating other tunnel devices.
1632 *
1633 * Return:
1634 * 0 on success,
1635 * %-EFAULT if unable to copy data to or from userspace,
1636 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1637 * %-EINVAL if passed tunnel parameters are invalid,
1638 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1639 * %-ENODEV if attempting to change or delete a nonexisting device
1640 **/
1641
1642 static int
ip6_tnl_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)1643 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1644 {
1645 int err = 0;
1646 struct ip6_tnl_parm p;
1647 struct __ip6_tnl_parm p1;
1648 struct ip6_tnl *t = netdev_priv(dev);
1649 struct net *net = t->net;
1650 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1651
1652 memset(&p1, 0, sizeof(p1));
1653
1654 switch (cmd) {
1655 case SIOCGETTUNNEL:
1656 if (dev == ip6n->fb_tnl_dev) {
1657 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1658 err = -EFAULT;
1659 break;
1660 }
1661 ip6_tnl_parm_from_user(&p1, &p);
1662 t = ip6_tnl_locate(net, &p1, 0);
1663 if (IS_ERR(t))
1664 t = netdev_priv(dev);
1665 } else {
1666 memset(&p, 0, sizeof(p));
1667 }
1668 ip6_tnl_parm_to_user(&p, &t->parms);
1669 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1670 err = -EFAULT;
1671 }
1672 break;
1673 case SIOCADDTUNNEL:
1674 case SIOCCHGTUNNEL:
1675 err = -EPERM;
1676 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1677 break;
1678 err = -EFAULT;
1679 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1680 break;
1681 err = -EINVAL;
1682 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1683 p.proto != 0)
1684 break;
1685 ip6_tnl_parm_from_user(&p1, &p);
1686 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1687 if (cmd == SIOCCHGTUNNEL) {
1688 if (!IS_ERR(t)) {
1689 if (t->dev != dev) {
1690 err = -EEXIST;
1691 break;
1692 }
1693 } else
1694 t = netdev_priv(dev);
1695 if (dev == ip6n->fb_tnl_dev)
1696 err = ip6_tnl0_update(t, &p1);
1697 else
1698 err = ip6_tnl_update(t, &p1);
1699 }
1700 if (!IS_ERR(t)) {
1701 err = 0;
1702 ip6_tnl_parm_to_user(&p, &t->parms);
1703 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1704 err = -EFAULT;
1705
1706 } else {
1707 err = PTR_ERR(t);
1708 }
1709 break;
1710 case SIOCDELTUNNEL:
1711 err = -EPERM;
1712 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1713 break;
1714
1715 if (dev == ip6n->fb_tnl_dev) {
1716 err = -EFAULT;
1717 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1718 break;
1719 err = -ENOENT;
1720 ip6_tnl_parm_from_user(&p1, &p);
1721 t = ip6_tnl_locate(net, &p1, 0);
1722 if (IS_ERR(t))
1723 break;
1724 err = -EPERM;
1725 if (t->dev == ip6n->fb_tnl_dev)
1726 break;
1727 dev = t->dev;
1728 }
1729 err = 0;
1730 unregister_netdevice(dev);
1731 break;
1732 default:
1733 err = -EINVAL;
1734 }
1735 return err;
1736 }
1737
1738 /**
1739 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1740 * @dev: virtual device associated with tunnel
1741 * @new_mtu: the new mtu
1742 *
1743 * Return:
1744 * 0 on success,
1745 * %-EINVAL if mtu too small
1746 **/
1747
ip6_tnl_change_mtu(struct net_device * dev,int new_mtu)1748 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1749 {
1750 struct ip6_tnl *tnl = netdev_priv(dev);
1751
1752 if (tnl->parms.proto == IPPROTO_IPV6) {
1753 if (new_mtu < IPV6_MIN_MTU)
1754 return -EINVAL;
1755 } else {
1756 if (new_mtu < ETH_MIN_MTU)
1757 return -EINVAL;
1758 }
1759 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1760 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1761 return -EINVAL;
1762 } else {
1763 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1764 return -EINVAL;
1765 }
1766 dev->mtu = new_mtu;
1767 return 0;
1768 }
1769 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1770
ip6_tnl_get_iflink(const struct net_device * dev)1771 int ip6_tnl_get_iflink(const struct net_device *dev)
1772 {
1773 struct ip6_tnl *t = netdev_priv(dev);
1774
1775 return t->parms.link;
1776 }
1777 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1778
ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1779 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1780 unsigned int num)
1781 {
1782 if (num >= MAX_IPTUN_ENCAP_OPS)
1783 return -ERANGE;
1784
1785 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1786 &ip6tun_encaps[num],
1787 NULL, ops) ? 0 : -1;
1788 }
1789 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1790
ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops * ops,unsigned int num)1791 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1792 unsigned int num)
1793 {
1794 int ret;
1795
1796 if (num >= MAX_IPTUN_ENCAP_OPS)
1797 return -ERANGE;
1798
1799 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1800 &ip6tun_encaps[num],
1801 ops, NULL) == ops) ? 0 : -1;
1802
1803 synchronize_net();
1804
1805 return ret;
1806 }
1807 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1808
ip6_tnl_encap_setup(struct ip6_tnl * t,struct ip_tunnel_encap * ipencap)1809 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1810 struct ip_tunnel_encap *ipencap)
1811 {
1812 int hlen;
1813
1814 memset(&t->encap, 0, sizeof(t->encap));
1815
1816 hlen = ip6_encap_hlen(ipencap);
1817 if (hlen < 0)
1818 return hlen;
1819
1820 t->encap.type = ipencap->type;
1821 t->encap.sport = ipencap->sport;
1822 t->encap.dport = ipencap->dport;
1823 t->encap.flags = ipencap->flags;
1824
1825 t->encap_hlen = hlen;
1826 t->hlen = t->encap_hlen + t->tun_hlen;
1827
1828 return 0;
1829 }
1830 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1831
1832 static const struct net_device_ops ip6_tnl_netdev_ops = {
1833 .ndo_init = ip6_tnl_dev_init,
1834 .ndo_uninit = ip6_tnl_dev_uninit,
1835 .ndo_start_xmit = ip6_tnl_start_xmit,
1836 .ndo_do_ioctl = ip6_tnl_ioctl,
1837 .ndo_change_mtu = ip6_tnl_change_mtu,
1838 .ndo_get_stats = ip6_get_stats,
1839 .ndo_get_iflink = ip6_tnl_get_iflink,
1840 };
1841
1842 #define IPXIPX_FEATURES (NETIF_F_SG | \
1843 NETIF_F_FRAGLIST | \
1844 NETIF_F_HIGHDMA | \
1845 NETIF_F_GSO_SOFTWARE | \
1846 NETIF_F_HW_CSUM)
1847
1848 /**
1849 * ip6_tnl_dev_setup - setup virtual tunnel device
1850 * @dev: virtual device associated with tunnel
1851 *
1852 * Description:
1853 * Initialize function pointers and device parameters
1854 **/
1855
ip6_tnl_dev_setup(struct net_device * dev)1856 static void ip6_tnl_dev_setup(struct net_device *dev)
1857 {
1858 dev->netdev_ops = &ip6_tnl_netdev_ops;
1859 dev->header_ops = &ip_tunnel_header_ops;
1860 dev->needs_free_netdev = true;
1861 dev->priv_destructor = ip6_dev_free;
1862
1863 dev->type = ARPHRD_TUNNEL6;
1864 dev->flags |= IFF_NOARP;
1865 dev->addr_len = sizeof(struct in6_addr);
1866 dev->features |= NETIF_F_LLTX;
1867 netif_keep_dst(dev);
1868
1869 dev->features |= IPXIPX_FEATURES;
1870 dev->hw_features |= IPXIPX_FEATURES;
1871
1872 /* This perm addr will be used as interface identifier by IPv6 */
1873 dev->addr_assign_type = NET_ADDR_RANDOM;
1874 eth_random_addr(dev->perm_addr);
1875 }
1876
1877
1878 /**
1879 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1880 * @dev: virtual device associated with tunnel
1881 **/
1882
1883 static inline int
ip6_tnl_dev_init_gen(struct net_device * dev)1884 ip6_tnl_dev_init_gen(struct net_device *dev)
1885 {
1886 struct ip6_tnl *t = netdev_priv(dev);
1887 int ret;
1888 int t_hlen;
1889
1890 t->dev = dev;
1891 t->net = dev_net(dev);
1892 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1893 if (!dev->tstats)
1894 return -ENOMEM;
1895
1896 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1897 if (ret)
1898 goto free_stats;
1899
1900 ret = gro_cells_init(&t->gro_cells, dev);
1901 if (ret)
1902 goto destroy_dst;
1903
1904 t->tun_hlen = 0;
1905 t->hlen = t->encap_hlen + t->tun_hlen;
1906 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1907
1908 dev->type = ARPHRD_TUNNEL6;
1909 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1910 dev->mtu = ETH_DATA_LEN - t_hlen;
1911 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1912 dev->mtu -= 8;
1913 dev->min_mtu = ETH_MIN_MTU;
1914 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1915
1916 return 0;
1917
1918 destroy_dst:
1919 dst_cache_destroy(&t->dst_cache);
1920 free_stats:
1921 free_percpu(dev->tstats);
1922 dev->tstats = NULL;
1923
1924 return ret;
1925 }
1926
1927 /**
1928 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1929 * @dev: virtual device associated with tunnel
1930 **/
1931
ip6_tnl_dev_init(struct net_device * dev)1932 static int ip6_tnl_dev_init(struct net_device *dev)
1933 {
1934 struct ip6_tnl *t = netdev_priv(dev);
1935 int err = ip6_tnl_dev_init_gen(dev);
1936
1937 if (err)
1938 return err;
1939 ip6_tnl_link_config(t);
1940 if (t->parms.collect_md)
1941 netif_keep_dst(dev);
1942 return 0;
1943 }
1944
1945 /**
1946 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1947 * @dev: fallback device
1948 *
1949 * Return: 0
1950 **/
1951
ip6_fb_tnl_dev_init(struct net_device * dev)1952 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1953 {
1954 struct ip6_tnl *t = netdev_priv(dev);
1955 struct net *net = dev_net(dev);
1956 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1957
1958 t->parms.proto = IPPROTO_IPV6;
1959 dev_hold(dev);
1960
1961 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1962 return 0;
1963 }
1964
ip6_tnl_validate(struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)1965 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1966 struct netlink_ext_ack *extack)
1967 {
1968 u8 proto;
1969
1970 if (!data || !data[IFLA_IPTUN_PROTO])
1971 return 0;
1972
1973 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1974 if (proto != IPPROTO_IPV6 &&
1975 proto != IPPROTO_IPIP &&
1976 proto != 0)
1977 return -EINVAL;
1978
1979 return 0;
1980 }
1981
ip6_tnl_netlink_parms(struct nlattr * data[],struct __ip6_tnl_parm * parms)1982 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1983 struct __ip6_tnl_parm *parms)
1984 {
1985 memset(parms, 0, sizeof(*parms));
1986
1987 if (!data)
1988 return;
1989
1990 if (data[IFLA_IPTUN_LINK])
1991 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1992
1993 if (data[IFLA_IPTUN_LOCAL])
1994 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1995
1996 if (data[IFLA_IPTUN_REMOTE])
1997 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1998
1999 if (data[IFLA_IPTUN_TTL])
2000 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
2001
2002 if (data[IFLA_IPTUN_ENCAP_LIMIT])
2003 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
2004
2005 if (data[IFLA_IPTUN_FLOWINFO])
2006 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
2007
2008 if (data[IFLA_IPTUN_FLAGS])
2009 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
2010
2011 if (data[IFLA_IPTUN_PROTO])
2012 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2013
2014 if (data[IFLA_IPTUN_COLLECT_METADATA])
2015 parms->collect_md = true;
2016
2017 if (data[IFLA_IPTUN_FWMARK])
2018 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2019 }
2020
ip6_tnl_netlink_encap_parms(struct nlattr * data[],struct ip_tunnel_encap * ipencap)2021 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
2022 struct ip_tunnel_encap *ipencap)
2023 {
2024 bool ret = false;
2025
2026 memset(ipencap, 0, sizeof(*ipencap));
2027
2028 if (!data)
2029 return ret;
2030
2031 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2032 ret = true;
2033 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2034 }
2035
2036 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2037 ret = true;
2038 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2039 }
2040
2041 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2042 ret = true;
2043 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2044 }
2045
2046 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2047 ret = true;
2048 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2049 }
2050
2051 return ret;
2052 }
2053
ip6_tnl_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2054 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2055 struct nlattr *tb[], struct nlattr *data[],
2056 struct netlink_ext_ack *extack)
2057 {
2058 struct net *net = dev_net(dev);
2059 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2060 struct ip_tunnel_encap ipencap;
2061 struct ip6_tnl *nt, *t;
2062 int err;
2063
2064 nt = netdev_priv(dev);
2065
2066 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2067 err = ip6_tnl_encap_setup(nt, &ipencap);
2068 if (err < 0)
2069 return err;
2070 }
2071
2072 ip6_tnl_netlink_parms(data, &nt->parms);
2073
2074 if (nt->parms.collect_md) {
2075 if (rtnl_dereference(ip6n->collect_md_tun))
2076 return -EEXIST;
2077 } else {
2078 t = ip6_tnl_locate(net, &nt->parms, 0);
2079 if (!IS_ERR(t))
2080 return -EEXIST;
2081 }
2082
2083 err = ip6_tnl_create2(dev);
2084 if (!err && tb[IFLA_MTU])
2085 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2086
2087 return err;
2088 }
2089
ip6_tnl_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[],struct netlink_ext_ack * extack)2090 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2091 struct nlattr *data[],
2092 struct netlink_ext_ack *extack)
2093 {
2094 struct ip6_tnl *t = netdev_priv(dev);
2095 struct __ip6_tnl_parm p;
2096 struct net *net = t->net;
2097 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2098 struct ip_tunnel_encap ipencap;
2099
2100 if (dev == ip6n->fb_tnl_dev)
2101 return -EINVAL;
2102
2103 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2104 int err = ip6_tnl_encap_setup(t, &ipencap);
2105
2106 if (err < 0)
2107 return err;
2108 }
2109 ip6_tnl_netlink_parms(data, &p);
2110 if (p.collect_md)
2111 return -EINVAL;
2112
2113 t = ip6_tnl_locate(net, &p, 0);
2114 if (!IS_ERR(t)) {
2115 if (t->dev != dev)
2116 return -EEXIST;
2117 } else
2118 t = netdev_priv(dev);
2119
2120 return ip6_tnl_update(t, &p);
2121 }
2122
ip6_tnl_dellink(struct net_device * dev,struct list_head * head)2123 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2124 {
2125 struct net *net = dev_net(dev);
2126 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2127
2128 if (dev != ip6n->fb_tnl_dev)
2129 unregister_netdevice_queue(dev, head);
2130 }
2131
ip6_tnl_get_size(const struct net_device * dev)2132 static size_t ip6_tnl_get_size(const struct net_device *dev)
2133 {
2134 return
2135 /* IFLA_IPTUN_LINK */
2136 nla_total_size(4) +
2137 /* IFLA_IPTUN_LOCAL */
2138 nla_total_size(sizeof(struct in6_addr)) +
2139 /* IFLA_IPTUN_REMOTE */
2140 nla_total_size(sizeof(struct in6_addr)) +
2141 /* IFLA_IPTUN_TTL */
2142 nla_total_size(1) +
2143 /* IFLA_IPTUN_ENCAP_LIMIT */
2144 nla_total_size(1) +
2145 /* IFLA_IPTUN_FLOWINFO */
2146 nla_total_size(4) +
2147 /* IFLA_IPTUN_FLAGS */
2148 nla_total_size(4) +
2149 /* IFLA_IPTUN_PROTO */
2150 nla_total_size(1) +
2151 /* IFLA_IPTUN_ENCAP_TYPE */
2152 nla_total_size(2) +
2153 /* IFLA_IPTUN_ENCAP_FLAGS */
2154 nla_total_size(2) +
2155 /* IFLA_IPTUN_ENCAP_SPORT */
2156 nla_total_size(2) +
2157 /* IFLA_IPTUN_ENCAP_DPORT */
2158 nla_total_size(2) +
2159 /* IFLA_IPTUN_COLLECT_METADATA */
2160 nla_total_size(0) +
2161 /* IFLA_IPTUN_FWMARK */
2162 nla_total_size(4) +
2163 0;
2164 }
2165
ip6_tnl_fill_info(struct sk_buff * skb,const struct net_device * dev)2166 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2167 {
2168 struct ip6_tnl *tunnel = netdev_priv(dev);
2169 struct __ip6_tnl_parm *parm = &tunnel->parms;
2170
2171 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2172 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2173 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2174 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2175 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2176 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2177 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2178 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2179 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2180 goto nla_put_failure;
2181
2182 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2183 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2184 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2185 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2186 goto nla_put_failure;
2187
2188 if (parm->collect_md)
2189 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2190 goto nla_put_failure;
2191
2192 return 0;
2193
2194 nla_put_failure:
2195 return -EMSGSIZE;
2196 }
2197
ip6_tnl_get_link_net(const struct net_device * dev)2198 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2199 {
2200 struct ip6_tnl *tunnel = netdev_priv(dev);
2201
2202 return tunnel->net;
2203 }
2204 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2205
2206 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2207 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2208 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2209 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2210 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2211 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2212 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2213 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2214 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2215 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2216 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2217 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2218 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2219 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2220 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2221 };
2222
2223 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2224 .kind = "ip6tnl",
2225 .maxtype = IFLA_IPTUN_MAX,
2226 .policy = ip6_tnl_policy,
2227 .priv_size = sizeof(struct ip6_tnl),
2228 .setup = ip6_tnl_dev_setup,
2229 .validate = ip6_tnl_validate,
2230 .newlink = ip6_tnl_newlink,
2231 .changelink = ip6_tnl_changelink,
2232 .dellink = ip6_tnl_dellink,
2233 .get_size = ip6_tnl_get_size,
2234 .fill_info = ip6_tnl_fill_info,
2235 .get_link_net = ip6_tnl_get_link_net,
2236 };
2237
2238 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2239 .handler = ip4ip6_rcv,
2240 .err_handler = ip4ip6_err,
2241 .priority = 1,
2242 };
2243
2244 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2245 .handler = ip6ip6_rcv,
2246 .err_handler = ip6ip6_err,
2247 .priority = 1,
2248 };
2249
2250 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2251 .handler = mplsip6_rcv,
2252 .err_handler = mplsip6_err,
2253 .priority = 1,
2254 };
2255
ip6_tnl_destroy_tunnels(struct net * net,struct list_head * list)2256 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2257 {
2258 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2259 struct net_device *dev, *aux;
2260 int h;
2261 struct ip6_tnl *t;
2262
2263 for_each_netdev_safe(net, dev, aux)
2264 if (dev->rtnl_link_ops == &ip6_link_ops)
2265 unregister_netdevice_queue(dev, list);
2266
2267 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2268 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2269 while (t) {
2270 /* If dev is in the same netns, it has already
2271 * been added to the list by the previous loop.
2272 */
2273 if (!net_eq(dev_net(t->dev), net))
2274 unregister_netdevice_queue(t->dev, list);
2275 t = rtnl_dereference(t->next);
2276 }
2277 }
2278 }
2279
ip6_tnl_init_net(struct net * net)2280 static int __net_init ip6_tnl_init_net(struct net *net)
2281 {
2282 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2283 struct ip6_tnl *t = NULL;
2284 int err;
2285
2286 ip6n->tnls[0] = ip6n->tnls_wc;
2287 ip6n->tnls[1] = ip6n->tnls_r_l;
2288
2289 if (!net_has_fallback_tunnels(net))
2290 return 0;
2291 err = -ENOMEM;
2292 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2293 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2294
2295 if (!ip6n->fb_tnl_dev)
2296 goto err_alloc_dev;
2297 dev_net_set(ip6n->fb_tnl_dev, net);
2298 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2299 /* FB netdevice is special: we have one, and only one per netns.
2300 * Allowing to move it to another netns is clearly unsafe.
2301 */
2302 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2303
2304 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2305 if (err < 0)
2306 goto err_register;
2307
2308 err = register_netdev(ip6n->fb_tnl_dev);
2309 if (err < 0)
2310 goto err_register;
2311
2312 t = netdev_priv(ip6n->fb_tnl_dev);
2313
2314 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2315 return 0;
2316
2317 err_register:
2318 free_netdev(ip6n->fb_tnl_dev);
2319 err_alloc_dev:
2320 return err;
2321 }
2322
ip6_tnl_exit_batch_net(struct list_head * net_list)2323 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2324 {
2325 struct net *net;
2326 LIST_HEAD(list);
2327
2328 rtnl_lock();
2329 list_for_each_entry(net, net_list, exit_list)
2330 ip6_tnl_destroy_tunnels(net, &list);
2331 unregister_netdevice_many(&list);
2332 rtnl_unlock();
2333 }
2334
2335 static struct pernet_operations ip6_tnl_net_ops = {
2336 .init = ip6_tnl_init_net,
2337 .exit_batch = ip6_tnl_exit_batch_net,
2338 .id = &ip6_tnl_net_id,
2339 .size = sizeof(struct ip6_tnl_net),
2340 };
2341
2342 /**
2343 * ip6_tunnel_init - register protocol and reserve needed resources
2344 *
2345 * Return: 0 on success
2346 **/
2347
ip6_tunnel_init(void)2348 static int __init ip6_tunnel_init(void)
2349 {
2350 int err;
2351
2352 if (!ipv6_mod_enabled())
2353 return -EOPNOTSUPP;
2354
2355 err = register_pernet_device(&ip6_tnl_net_ops);
2356 if (err < 0)
2357 goto out_pernet;
2358
2359 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2360 if (err < 0) {
2361 pr_err("%s: can't register ip4ip6\n", __func__);
2362 goto out_ip4ip6;
2363 }
2364
2365 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2366 if (err < 0) {
2367 pr_err("%s: can't register ip6ip6\n", __func__);
2368 goto out_ip6ip6;
2369 }
2370
2371 if (ip6_tnl_mpls_supported()) {
2372 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2373 if (err < 0) {
2374 pr_err("%s: can't register mplsip6\n", __func__);
2375 goto out_mplsip6;
2376 }
2377 }
2378
2379 err = rtnl_link_register(&ip6_link_ops);
2380 if (err < 0)
2381 goto rtnl_link_failed;
2382
2383 return 0;
2384
2385 rtnl_link_failed:
2386 if (ip6_tnl_mpls_supported())
2387 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2388 out_mplsip6:
2389 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2390 out_ip6ip6:
2391 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2392 out_ip4ip6:
2393 unregister_pernet_device(&ip6_tnl_net_ops);
2394 out_pernet:
2395 return err;
2396 }
2397
2398 /**
2399 * ip6_tunnel_cleanup - free resources and unregister protocol
2400 **/
2401
ip6_tunnel_cleanup(void)2402 static void __exit ip6_tunnel_cleanup(void)
2403 {
2404 rtnl_link_unregister(&ip6_link_ops);
2405 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2406 pr_info("%s: can't deregister ip4ip6\n", __func__);
2407
2408 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2409 pr_info("%s: can't deregister ip6ip6\n", __func__);
2410
2411 if (ip6_tnl_mpls_supported() &&
2412 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2413 pr_info("%s: can't deregister mplsip6\n", __func__);
2414 unregister_pernet_device(&ip6_tnl_net_ops);
2415 }
2416
2417 module_init(ip6_tunnel_init);
2418 module_exit(ip6_tunnel_cleanup);
2419
