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[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / ip6_tunnel.c
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
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
92 static inline int ip6_tnl_mpls_supported(void)
93 {
94 return IS_ENABLED(CONFIG_MPLS);
95 }
96
97 #define for_each_ip6_tunnel_rcu(start) \
98 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
99
100 /**
101 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
102 * @net: network namespace
103 * @link: ifindex of underlying interface
104 * @remote: the address of the tunnel exit-point
105 * @local: the address of the tunnel entry-point
106 *
107 * Return:
108 * tunnel matching given end-points if found,
109 * else fallback tunnel if its device is up,
110 * else %NULL
111 **/
112
113 static struct ip6_tnl *
114 ip6_tnl_lookup(struct net *net, int link,
115 const struct in6_addr *remote, const struct in6_addr *local)
116 {
117 unsigned int hash = HASH(remote, local);
118 struct ip6_tnl *t, *cand = NULL;
119 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
120 struct in6_addr any;
121
122 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
123 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
124 !ipv6_addr_equal(remote, &t->parms.raddr) ||
125 !(t->dev->flags & IFF_UP))
126 continue;
127
128 if (link == t->parms.link)
129 return t;
130 else
131 cand = t;
132 }
133
134 memset(&any, 0, sizeof(any));
135 hash = HASH(&any, local);
136 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
137 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
138 !ipv6_addr_any(&t->parms.raddr) ||
139 !(t->dev->flags & IFF_UP))
140 continue;
141
142 if (link == t->parms.link)
143 return t;
144 else if (!cand)
145 cand = t;
146 }
147
148 hash = HASH(remote, &any);
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
151 !ipv6_addr_any(&t->parms.laddr) ||
152 !(t->dev->flags & IFF_UP))
153 continue;
154
155 if (link == t->parms.link)
156 return t;
157 else if (!cand)
158 cand = t;
159 }
160
161 if (cand)
162 return cand;
163
164 t = rcu_dereference(ip6n->collect_md_tun);
165 if (t && t->dev->flags & IFF_UP)
166 return t;
167
168 t = rcu_dereference(ip6n->tnls_wc[0]);
169 if (t && (t->dev->flags & IFF_UP))
170 return t;
171
172 return NULL;
173 }
174
175 /**
176 * ip6_tnl_bucket - get head of list matching given tunnel parameters
177 * @ip6n: the private data for ip6_vti in the netns
178 * @p: parameters containing tunnel end-points
179 *
180 * Description:
181 * ip6_tnl_bucket() returns the head of the list matching the
182 * &struct in6_addr entries laddr and raddr in @p.
183 *
184 * Return: head of IPv6 tunnel list
185 **/
186
187 static struct ip6_tnl __rcu **
188 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
189 {
190 const struct in6_addr *remote = &p->raddr;
191 const struct in6_addr *local = &p->laddr;
192 unsigned int h = 0;
193 int prio = 0;
194
195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
196 prio = 1;
197 h = HASH(remote, local);
198 }
199 return &ip6n->tnls[prio][h];
200 }
201
202 /**
203 * ip6_tnl_link - add tunnel to hash table
204 * @ip6n: the private data for ip6_vti in the netns
205 * @t: tunnel to be added
206 **/
207
208 static void
209 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
210 {
211 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
212
213 if (t->parms.collect_md)
214 rcu_assign_pointer(ip6n->collect_md_tun, t);
215 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
216 rcu_assign_pointer(*tp, t);
217 }
218
219 /**
220 * ip6_tnl_unlink - remove tunnel from hash table
221 * @ip6n: the private data for ip6_vti in the netns
222 * @t: tunnel to be removed
223 **/
224
225 static void
226 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
227 {
228 struct ip6_tnl __rcu **tp;
229 struct ip6_tnl *iter;
230
231 if (t->parms.collect_md)
232 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
233
234 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
235 (iter = rtnl_dereference(*tp)) != NULL;
236 tp = &iter->next) {
237 if (t == iter) {
238 rcu_assign_pointer(*tp, t->next);
239 break;
240 }
241 }
242 }
243
244 static void ip6_dev_free(struct net_device *dev)
245 {
246 struct ip6_tnl *t = netdev_priv(dev);
247
248 gro_cells_destroy(&t->gro_cells);
249 dst_cache_destroy(&t->dst_cache);
250 free_percpu(dev->tstats);
251 }
252
253 static int ip6_tnl_create2(struct net_device *dev)
254 {
255 struct ip6_tnl *t = netdev_priv(dev);
256 struct net *net = dev_net(dev);
257 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
258 int err;
259
260 t = netdev_priv(dev);
261
262 dev->rtnl_link_ops = &ip6_link_ops;
263 err = register_netdevice(dev);
264 if (err < 0)
265 goto out;
266
267 strcpy(t->parms.name, dev->name);
268
269 ip6_tnl_link(ip6n, t);
270 return 0;
271
272 out:
273 return err;
274 }
275
276 /**
277 * ip6_tnl_create - create a new tunnel
278 * @net: network namespace
279 * @p: tunnel parameters
280 *
281 * Description:
282 * Create tunnel matching given parameters.
283 *
284 * Return:
285 * created tunnel or error pointer
286 **/
287
288 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
289 {
290 struct net_device *dev;
291 struct ip6_tnl *t;
292 char name[IFNAMSIZ];
293 int err = -E2BIG;
294
295 if (p->name[0]) {
296 if (!dev_valid_name(p->name))
297 goto failed;
298 strlcpy(name, p->name, IFNAMSIZ);
299 } else {
300 sprintf(name, "ip6tnl%%d");
301 }
302 err = -ENOMEM;
303 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
304 ip6_tnl_dev_setup);
305 if (!dev)
306 goto failed;
307
308 dev_net_set(dev, net);
309
310 t = netdev_priv(dev);
311 t->parms = *p;
312 t->net = dev_net(dev);
313 err = ip6_tnl_create2(dev);
314 if (err < 0)
315 goto failed_free;
316
317 return t;
318
319 failed_free:
320 free_netdev(dev);
321 failed:
322 return ERR_PTR(err);
323 }
324
325 /**
326 * ip6_tnl_locate - find or create tunnel matching given parameters
327 * @net: network namespace
328 * @p: tunnel parameters
329 * @create: != 0 if allowed to create new tunnel if no match found
330 *
331 * Description:
332 * ip6_tnl_locate() first tries to locate an existing tunnel
333 * based on @parms. If this is unsuccessful, but @create is set a new
334 * tunnel device is created and registered for use.
335 *
336 * Return:
337 * matching tunnel or error pointer
338 **/
339
340 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
341 struct __ip6_tnl_parm *p, int create)
342 {
343 const struct in6_addr *remote = &p->raddr;
344 const struct in6_addr *local = &p->laddr;
345 struct ip6_tnl __rcu **tp;
346 struct ip6_tnl *t;
347 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
348
349 for (tp = ip6_tnl_bucket(ip6n, p);
350 (t = rtnl_dereference(*tp)) != NULL;
351 tp = &t->next) {
352 if (ipv6_addr_equal(local, &t->parms.laddr) &&
353 ipv6_addr_equal(remote, &t->parms.raddr) &&
354 p->link == t->parms.link) {
355 if (create)
356 return ERR_PTR(-EEXIST);
357
358 return t;
359 }
360 }
361 if (!create)
362 return ERR_PTR(-ENODEV);
363 return ip6_tnl_create(net, p);
364 }
365
366 /**
367 * ip6_tnl_dev_uninit - tunnel device uninitializer
368 * @dev: the device to be destroyed
369 *
370 * Description:
371 * ip6_tnl_dev_uninit() removes tunnel from its list
372 **/
373
374 static void
375 ip6_tnl_dev_uninit(struct net_device *dev)
376 {
377 struct ip6_tnl *t = netdev_priv(dev);
378 struct net *net = t->net;
379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
380
381 if (dev == ip6n->fb_tnl_dev)
382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
383 else
384 ip6_tnl_unlink(ip6n, t);
385 dst_cache_reset(&t->dst_cache);
386 dev_put(dev);
387 }
388
389 /**
390 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
391 * @skb: received socket buffer
392 * @raw: the ICMPv6 error message data
393 *
394 * Return:
395 * 0 if none was found,
396 * else index to encapsulation limit
397 **/
398
399 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
400 {
401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
402 unsigned int nhoff = raw - skb->data;
403 unsigned int off = nhoff + sizeof(*ipv6h);
404 u8 next, nexthdr = ipv6h->nexthdr;
405
406 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
407 struct ipv6_opt_hdr *hdr;
408 u16 optlen;
409
410 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
411 break;
412
413 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
414 if (nexthdr == NEXTHDR_FRAGMENT) {
415 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
416 if (frag_hdr->frag_off)
417 break;
418 optlen = 8;
419 } else if (nexthdr == NEXTHDR_AUTH) {
420 optlen = ipv6_authlen(hdr);
421 } else {
422 optlen = ipv6_optlen(hdr);
423 }
424 /* cache hdr->nexthdr, since pskb_may_pull() might
425 * invalidate hdr
426 */
427 next = hdr->nexthdr;
428 if (nexthdr == NEXTHDR_DEST) {
429 u16 i = 2;
430
431 /* Remember : hdr is no longer valid at this point. */
432 if (!pskb_may_pull(skb, off + optlen))
433 break;
434
435 while (1) {
436 struct ipv6_tlv_tnl_enc_lim *tel;
437
438 /* No more room for encapsulation limit */
439 if (i + sizeof(*tel) > optlen)
440 break;
441
442 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
443 /* return index of option if found and valid */
444 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
445 tel->length == 1)
446 return i + off - nhoff;
447 /* else jump to next option */
448 if (tel->type)
449 i += tel->length + 2;
450 else
451 i++;
452 }
453 }
454 nexthdr = next;
455 off += optlen;
456 }
457 return 0;
458 }
459 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
460
461 /* ip6_tnl_err() should handle errors in the tunnel according to the
462 * specifications in RFC 2473.
463 */
464 static int
465 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
466 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
467 {
468 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
469 struct net *net = dev_net(skb->dev);
470 u8 rel_type = ICMPV6_DEST_UNREACH;
471 u8 rel_code = ICMPV6_ADDR_UNREACH;
472 __u32 rel_info = 0;
473 struct ip6_tnl *t;
474 int err = -ENOENT;
475 int rel_msg = 0;
476 u8 tproto;
477 __u16 len;
478
479 /* If the packet doesn't contain the original IPv6 header we are
480 in trouble since we might need the source address for further
481 processing of the error. */
482
483 rcu_read_lock();
484 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
485 if (!t)
486 goto out;
487
488 tproto = READ_ONCE(t->parms.proto);
489 if (tproto != ipproto && tproto != 0)
490 goto out;
491
492 err = 0;
493
494 switch (*type) {
495 case ICMPV6_DEST_UNREACH:
496 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
497 t->parms.name);
498 rel_msg = 1;
499 break;
500 case ICMPV6_TIME_EXCEED:
501 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
502 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
503 t->parms.name);
504 rel_msg = 1;
505 }
506 break;
507 case ICMPV6_PARAMPROB: {
508 struct ipv6_tlv_tnl_enc_lim *tel;
509 __u32 teli;
510
511 teli = 0;
512 if ((*code) == ICMPV6_HDR_FIELD)
513 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
514
515 if (teli && teli == *info - 2) {
516 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
517 if (tel->encap_limit == 0) {
518 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
519 t->parms.name);
520 rel_msg = 1;
521 }
522 } else {
523 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
524 t->parms.name);
525 }
526 break;
527 }
528 case ICMPV6_PKT_TOOBIG: {
529 __u32 mtu;
530
531 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
532 sock_net_uid(net, NULL));
533 mtu = *info - offset;
534 if (mtu < IPV6_MIN_MTU)
535 mtu = IPV6_MIN_MTU;
536 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
537 if (len > mtu) {
538 rel_type = ICMPV6_PKT_TOOBIG;
539 rel_code = 0;
540 rel_info = mtu;
541 rel_msg = 1;
542 }
543 break;
544 }
545 case NDISC_REDIRECT:
546 ip6_redirect(skb, net, skb->dev->ifindex, 0,
547 sock_net_uid(net, NULL));
548 break;
549 }
550
551 *type = rel_type;
552 *code = rel_code;
553 *info = rel_info;
554 *msg = rel_msg;
555
556 out:
557 rcu_read_unlock();
558 return err;
559 }
560
561 static int
562 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
563 u8 type, u8 code, int offset, __be32 info)
564 {
565 __u32 rel_info = ntohl(info);
566 const struct iphdr *eiph;
567 struct sk_buff *skb2;
568 int err, rel_msg = 0;
569 u8 rel_type = type;
570 u8 rel_code = code;
571 struct rtable *rt;
572 struct flowi4 fl4;
573
574 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
575 &rel_msg, &rel_info, offset);
576 if (err < 0)
577 return err;
578
579 if (rel_msg == 0)
580 return 0;
581
582 switch (rel_type) {
583 case ICMPV6_DEST_UNREACH:
584 if (rel_code != ICMPV6_ADDR_UNREACH)
585 return 0;
586 rel_type = ICMP_DEST_UNREACH;
587 rel_code = ICMP_HOST_UNREACH;
588 break;
589 case ICMPV6_PKT_TOOBIG:
590 if (rel_code != 0)
591 return 0;
592 rel_type = ICMP_DEST_UNREACH;
593 rel_code = ICMP_FRAG_NEEDED;
594 break;
595 default:
596 return 0;
597 }
598
599 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
600 return 0;
601
602 skb2 = skb_clone(skb, GFP_ATOMIC);
603 if (!skb2)
604 return 0;
605
606 skb_dst_drop(skb2);
607
608 skb_pull(skb2, offset);
609 skb_reset_network_header(skb2);
610 eiph = ip_hdr(skb2);
611
612 /* Try to guess incoming interface */
613 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
614 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
615 if (IS_ERR(rt))
616 goto out;
617
618 skb2->dev = rt->dst.dev;
619 ip_rt_put(rt);
620
621 /* route "incoming" packet */
622 if (rt->rt_flags & RTCF_LOCAL) {
623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
624 eiph->daddr, eiph->saddr, 0, 0,
625 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
626 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
627 if (!IS_ERR(rt))
628 ip_rt_put(rt);
629 goto out;
630 }
631 skb_dst_set(skb2, &rt->dst);
632 } else {
633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
634 skb2->dev) ||
635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
636 goto out;
637 }
638
639 /* change mtu on this route */
640 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
641 if (rel_info > dst_mtu(skb_dst(skb2)))
642 goto out;
643
644 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
645 }
646
647 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
648
649 out:
650 kfree_skb(skb2);
651 return 0;
652 }
653
654 static int
655 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
656 u8 type, u8 code, int offset, __be32 info)
657 {
658 __u32 rel_info = ntohl(info);
659 int err, rel_msg = 0;
660 u8 rel_type = type;
661 u8 rel_code = code;
662
663 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
664 &rel_msg, &rel_info, offset);
665 if (err < 0)
666 return err;
667
668 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
669 struct rt6_info *rt;
670 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
671
672 if (!skb2)
673 return 0;
674
675 skb_dst_drop(skb2);
676 skb_pull(skb2, offset);
677 skb_reset_network_header(skb2);
678
679 /* Try to guess incoming interface */
680 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
681 NULL, 0, skb2, 0);
682
683 if (rt && rt->dst.dev)
684 skb2->dev = rt->dst.dev;
685
686 icmpv6_send(skb2, rel_type, rel_code, rel_info);
687
688 ip6_rt_put(rt);
689
690 kfree_skb(skb2);
691 }
692
693 return 0;
694 }
695
696 static int
697 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
698 u8 type, u8 code, int offset, __be32 info)
699 {
700 __u32 rel_info = ntohl(info);
701 int err, rel_msg = 0;
702 u8 rel_type = type;
703 u8 rel_code = code;
704
705 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
706 &rel_msg, &rel_info, offset);
707 return err;
708 }
709
710 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
711 const struct ipv6hdr *ipv6h,
712 struct sk_buff *skb)
713 {
714 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
715
716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
717 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
718
719 return IP6_ECN_decapsulate(ipv6h, skb);
720 }
721
722 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
723 const struct ipv6hdr *ipv6h,
724 struct sk_buff *skb)
725 {
726 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
727 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
728
729 return IP6_ECN_decapsulate(ipv6h, skb);
730 }
731
732 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
733 const struct ipv6hdr *ipv6h,
734 struct sk_buff *skb)
735 {
736 /* ECN is not supported in AF_MPLS */
737 return 0;
738 }
739
740 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
741 const struct in6_addr *laddr,
742 const struct in6_addr *raddr)
743 {
744 struct __ip6_tnl_parm *p = &t->parms;
745 int ltype = ipv6_addr_type(laddr);
746 int rtype = ipv6_addr_type(raddr);
747 __u32 flags = 0;
748
749 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
750 flags = IP6_TNL_F_CAP_PER_PACKET;
751 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
752 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
753 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
754 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
755 if (ltype&IPV6_ADDR_UNICAST)
756 flags |= IP6_TNL_F_CAP_XMIT;
757 if (rtype&IPV6_ADDR_UNICAST)
758 flags |= IP6_TNL_F_CAP_RCV;
759 }
760 return flags;
761 }
762 EXPORT_SYMBOL(ip6_tnl_get_cap);
763
764 /* called with rcu_read_lock() */
765 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
766 const struct in6_addr *laddr,
767 const struct in6_addr *raddr)
768 {
769 struct __ip6_tnl_parm *p = &t->parms;
770 int ret = 0;
771 struct net *net = t->net;
772
773 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
774 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
775 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
776 struct net_device *ldev = NULL;
777
778 if (p->link)
779 ldev = dev_get_by_index_rcu(net, p->link);
780
781 if ((ipv6_addr_is_multicast(laddr) ||
782 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
783 0, IFA_F_TENTATIVE))) &&
784 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
785 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
786 0, IFA_F_TENTATIVE))))
787 ret = 1;
788 }
789 return ret;
790 }
791 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
792
793 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
794 const struct tnl_ptk_info *tpi,
795 struct metadata_dst *tun_dst,
796 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
797 const struct ipv6hdr *ipv6h,
798 struct sk_buff *skb),
799 bool log_ecn_err)
800 {
801 struct pcpu_sw_netstats *tstats;
802 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
803 int err;
804
805 if ((!(tpi->flags & TUNNEL_CSUM) &&
806 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
807 ((tpi->flags & TUNNEL_CSUM) &&
808 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
809 tunnel->dev->stats.rx_crc_errors++;
810 tunnel->dev->stats.rx_errors++;
811 goto drop;
812 }
813
814 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
815 if (!(tpi->flags & TUNNEL_SEQ) ||
816 (tunnel->i_seqno &&
817 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
818 tunnel->dev->stats.rx_fifo_errors++;
819 tunnel->dev->stats.rx_errors++;
820 goto drop;
821 }
822 tunnel->i_seqno = ntohl(tpi->seq) + 1;
823 }
824
825 skb->protocol = tpi->proto;
826
827 /* Warning: All skb pointers will be invalidated! */
828 if (tunnel->dev->type == ARPHRD_ETHER) {
829 if (!pskb_may_pull(skb, ETH_HLEN)) {
830 tunnel->dev->stats.rx_length_errors++;
831 tunnel->dev->stats.rx_errors++;
832 goto drop;
833 }
834
835 ipv6h = ipv6_hdr(skb);
836 skb->protocol = eth_type_trans(skb, tunnel->dev);
837 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
838 } else {
839 skb->dev = tunnel->dev;
840 skb_reset_mac_header(skb);
841 }
842
843 skb_reset_network_header(skb);
844 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
845
846 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
847
848 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
849 if (unlikely(err)) {
850 if (log_ecn_err)
851 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
852 &ipv6h->saddr,
853 ipv6_get_dsfield(ipv6h));
854 if (err > 1) {
855 ++tunnel->dev->stats.rx_frame_errors;
856 ++tunnel->dev->stats.rx_errors;
857 goto drop;
858 }
859 }
860
861 tstats = this_cpu_ptr(tunnel->dev->tstats);
862 u64_stats_update_begin(&tstats->syncp);
863 tstats->rx_packets++;
864 tstats->rx_bytes += skb->len;
865 u64_stats_update_end(&tstats->syncp);
866
867 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
868
869 if (tun_dst)
870 skb_dst_set(skb, (struct dst_entry *)tun_dst);
871
872 gro_cells_receive(&tunnel->gro_cells, skb);
873 return 0;
874
875 drop:
876 if (tun_dst)
877 dst_release((struct dst_entry *)tun_dst);
878 kfree_skb(skb);
879 return 0;
880 }
881
882 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
883 const struct tnl_ptk_info *tpi,
884 struct metadata_dst *tun_dst,
885 bool log_ecn_err)
886 {
887 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
888 const struct ipv6hdr *ipv6h,
889 struct sk_buff *skb);
890
891 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
892 if (tpi->proto == htons(ETH_P_IP))
893 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
894
895 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
896 log_ecn_err);
897 }
898 EXPORT_SYMBOL(ip6_tnl_rcv);
899
900 static const struct tnl_ptk_info tpi_v6 = {
901 /* no tunnel info required for ipxip6. */
902 .proto = htons(ETH_P_IPV6),
903 };
904
905 static const struct tnl_ptk_info tpi_v4 = {
906 /* no tunnel info required for ipxip6. */
907 .proto = htons(ETH_P_IP),
908 };
909
910 static const struct tnl_ptk_info tpi_mpls = {
911 /* no tunnel info required for mplsip6. */
912 .proto = htons(ETH_P_MPLS_UC),
913 };
914
915 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
916 const struct tnl_ptk_info *tpi,
917 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
918 const struct ipv6hdr *ipv6h,
919 struct sk_buff *skb))
920 {
921 struct ip6_tnl *t;
922 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
923 struct metadata_dst *tun_dst = NULL;
924 int ret = -1;
925
926 rcu_read_lock();
927 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
928
929 if (t) {
930 u8 tproto = READ_ONCE(t->parms.proto);
931
932 if (tproto != ipproto && tproto != 0)
933 goto drop;
934 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
935 goto drop;
936 ipv6h = ipv6_hdr(skb);
937 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
938 goto drop;
939 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
940 goto drop;
941 if (t->parms.collect_md) {
942 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
943 if (!tun_dst)
944 goto drop;
945 }
946 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
947 log_ecn_error);
948 }
949
950 rcu_read_unlock();
951
952 return ret;
953
954 drop:
955 rcu_read_unlock();
956 kfree_skb(skb);
957 return 0;
958 }
959
960 static int ip4ip6_rcv(struct sk_buff *skb)
961 {
962 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
963 ip4ip6_dscp_ecn_decapsulate);
964 }
965
966 static int ip6ip6_rcv(struct sk_buff *skb)
967 {
968 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
969 ip6ip6_dscp_ecn_decapsulate);
970 }
971
972 static int mplsip6_rcv(struct sk_buff *skb)
973 {
974 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
975 mplsip6_dscp_ecn_decapsulate);
976 }
977
978 struct ipv6_tel_txoption {
979 struct ipv6_txoptions ops;
980 __u8 dst_opt[8];
981 };
982
983 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
984 {
985 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
986
987 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
988 opt->dst_opt[3] = 1;
989 opt->dst_opt[4] = encap_limit;
990 opt->dst_opt[5] = IPV6_TLV_PADN;
991 opt->dst_opt[6] = 1;
992
993 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
994 opt->ops.opt_nflen = 8;
995 }
996
997 /**
998 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
999 * @t: the outgoing tunnel device
1000 * @hdr: IPv6 header from the incoming packet
1001 *
1002 * Description:
1003 * Avoid trivial tunneling loop by checking that tunnel exit-point
1004 * doesn't match source of incoming packet.
1005 *
1006 * Return:
1007 * 1 if conflict,
1008 * 0 else
1009 **/
1010
1011 static inline bool
1012 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1013 {
1014 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1015 }
1016
1017 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1018 const struct in6_addr *laddr,
1019 const struct in6_addr *raddr)
1020 {
1021 struct __ip6_tnl_parm *p = &t->parms;
1022 int ret = 0;
1023 struct net *net = t->net;
1024
1025 if (t->parms.collect_md)
1026 return 1;
1027
1028 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1029 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1030 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1031 struct net_device *ldev = NULL;
1032
1033 rcu_read_lock();
1034 if (p->link)
1035 ldev = dev_get_by_index_rcu(net, p->link);
1036
1037 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1038 0, IFA_F_TENTATIVE)))
1039 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1040 p->name);
1041 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1042 !ipv6_addr_is_multicast(raddr) &&
1043 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1044 true, 0, IFA_F_TENTATIVE)))
1045 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1046 p->name);
1047 else
1048 ret = 1;
1049 rcu_read_unlock();
1050 }
1051 return ret;
1052 }
1053 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1054
1055 /**
1056 * ip6_tnl_xmit - encapsulate packet and send
1057 * @skb: the outgoing socket buffer
1058 * @dev: the outgoing tunnel device
1059 * @dsfield: dscp code for outer header
1060 * @fl6: flow of tunneled packet
1061 * @encap_limit: encapsulation limit
1062 * @pmtu: Path MTU is stored if packet is too big
1063 * @proto: next header value
1064 *
1065 * Description:
1066 * Build new header and do some sanity checks on the packet before sending
1067 * it.
1068 *
1069 * Return:
1070 * 0 on success
1071 * -1 fail
1072 * %-EMSGSIZE message too big. return mtu in this case.
1073 **/
1074
1075 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1076 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1077 __u8 proto)
1078 {
1079 struct ip6_tnl *t = netdev_priv(dev);
1080 struct net *net = t->net;
1081 struct net_device_stats *stats = &t->dev->stats;
1082 struct ipv6hdr *ipv6h;
1083 struct ipv6_tel_txoption opt;
1084 struct dst_entry *dst = NULL, *ndst = NULL;
1085 struct net_device *tdev;
1086 int mtu;
1087 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1088 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1089 unsigned int max_headroom = psh_hlen;
1090 bool use_cache = false;
1091 u8 hop_limit;
1092 int err = -1;
1093
1094 if (t->parms.collect_md) {
1095 hop_limit = skb_tunnel_info(skb)->key.ttl;
1096 goto route_lookup;
1097 } else {
1098 hop_limit = t->parms.hop_limit;
1099 }
1100
1101 /* NBMA tunnel */
1102 if (ipv6_addr_any(&t->parms.raddr)) {
1103 if (skb->protocol == htons(ETH_P_IPV6)) {
1104 struct in6_addr *addr6;
1105 struct neighbour *neigh;
1106 int addr_type;
1107
1108 if (!skb_dst(skb))
1109 goto tx_err_link_failure;
1110
1111 neigh = dst_neigh_lookup(skb_dst(skb),
1112 &ipv6_hdr(skb)->daddr);
1113 if (!neigh)
1114 goto tx_err_link_failure;
1115
1116 addr6 = (struct in6_addr *)&neigh->primary_key;
1117 addr_type = ipv6_addr_type(addr6);
1118
1119 if (addr_type == IPV6_ADDR_ANY)
1120 addr6 = &ipv6_hdr(skb)->daddr;
1121
1122 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1123 neigh_release(neigh);
1124 }
1125 } else if (t->parms.proto != 0 && !(t->parms.flags &
1126 (IP6_TNL_F_USE_ORIG_TCLASS |
1127 IP6_TNL_F_USE_ORIG_FWMARK))) {
1128 /* enable the cache only if neither the outer protocol nor the
1129 * routing decision depends on the current inner header value
1130 */
1131 use_cache = true;
1132 }
1133
1134 if (use_cache)
1135 dst = dst_cache_get(&t->dst_cache);
1136
1137 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1138 goto tx_err_link_failure;
1139
1140 if (!dst) {
1141 route_lookup:
1142 /* add dsfield to flowlabel for route lookup */
1143 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1144
1145 dst = ip6_route_output(net, NULL, fl6);
1146
1147 if (dst->error)
1148 goto tx_err_link_failure;
1149 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1150 if (IS_ERR(dst)) {
1151 err = PTR_ERR(dst);
1152 dst = NULL;
1153 goto tx_err_link_failure;
1154 }
1155 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1156 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1157 &fl6->daddr, 0, &fl6->saddr))
1158 goto tx_err_link_failure;
1159 ndst = dst;
1160 }
1161
1162 tdev = dst->dev;
1163
1164 if (tdev == dev) {
1165 stats->collisions++;
1166 net_warn_ratelimited("%s: Local routing loop detected!\n",
1167 t->parms.name);
1168 goto tx_err_dst_release;
1169 }
1170 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1171 if (encap_limit >= 0) {
1172 max_headroom += 8;
1173 mtu -= 8;
1174 }
1175 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1176 IPV6_MIN_MTU : IPV4_MIN_MTU);
1177
1178 skb_dst_update_pmtu_no_confirm(skb, mtu);
1179 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1180 *pmtu = mtu;
1181 err = -EMSGSIZE;
1182 goto tx_err_dst_release;
1183 }
1184
1185 if (t->err_count > 0) {
1186 if (time_before(jiffies,
1187 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1188 t->err_count--;
1189
1190 dst_link_failure(skb);
1191 } else {
1192 t->err_count = 0;
1193 }
1194 }
1195
1196 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1197
1198 /*
1199 * Okay, now see if we can stuff it in the buffer as-is.
1200 */
1201 max_headroom += LL_RESERVED_SPACE(tdev);
1202
1203 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1204 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1205 struct sk_buff *new_skb;
1206
1207 new_skb = skb_realloc_headroom(skb, max_headroom);
1208 if (!new_skb)
1209 goto tx_err_dst_release;
1210
1211 if (skb->sk)
1212 skb_set_owner_w(new_skb, skb->sk);
1213 consume_skb(skb);
1214 skb = new_skb;
1215 }
1216
1217 if (t->parms.collect_md) {
1218 if (t->encap.type != TUNNEL_ENCAP_NONE)
1219 goto tx_err_dst_release;
1220 } else {
1221 if (use_cache && ndst)
1222 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1223 }
1224 skb_dst_set(skb, dst);
1225
1226 if (hop_limit == 0) {
1227 if (skb->protocol == htons(ETH_P_IP))
1228 hop_limit = ip_hdr(skb)->ttl;
1229 else if (skb->protocol == htons(ETH_P_IPV6))
1230 hop_limit = ipv6_hdr(skb)->hop_limit;
1231 else
1232 hop_limit = ip6_dst_hoplimit(dst);
1233 }
1234
1235 /* Calculate max headroom for all the headers and adjust
1236 * needed_headroom if necessary.
1237 */
1238 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1239 + dst->header_len + t->hlen;
1240 if (max_headroom > dev->needed_headroom)
1241 dev->needed_headroom = max_headroom;
1242
1243 err = ip6_tnl_encap(skb, t, &proto, fl6);
1244 if (err)
1245 return err;
1246
1247 if (encap_limit >= 0) {
1248 init_tel_txopt(&opt, encap_limit);
1249 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1250 }
1251
1252 skb_push(skb, sizeof(struct ipv6hdr));
1253 skb_reset_network_header(skb);
1254 ipv6h = ipv6_hdr(skb);
1255 ip6_flow_hdr(ipv6h, dsfield,
1256 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1257 ipv6h->hop_limit = hop_limit;
1258 ipv6h->nexthdr = proto;
1259 ipv6h->saddr = fl6->saddr;
1260 ipv6h->daddr = fl6->daddr;
1261 ip6tunnel_xmit(NULL, skb, dev);
1262 return 0;
1263 tx_err_link_failure:
1264 stats->tx_carrier_errors++;
1265 dst_link_failure(skb);
1266 tx_err_dst_release:
1267 dst_release(dst);
1268 return err;
1269 }
1270 EXPORT_SYMBOL(ip6_tnl_xmit);
1271
1272 static inline int
1273 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1274 u8 protocol)
1275 {
1276 struct ip6_tnl *t = netdev_priv(dev);
1277 struct ipv6hdr *ipv6h;
1278 const struct iphdr *iph;
1279 int encap_limit = -1;
1280 __u16 offset;
1281 struct flowi6 fl6;
1282 __u8 dsfield, orig_dsfield;
1283 __u32 mtu;
1284 u8 tproto;
1285 int err;
1286
1287 tproto = READ_ONCE(t->parms.proto);
1288 if (tproto != protocol && tproto != 0)
1289 return -1;
1290
1291 if (t->parms.collect_md) {
1292 struct ip_tunnel_info *tun_info;
1293 const struct ip_tunnel_key *key;
1294
1295 tun_info = skb_tunnel_info(skb);
1296 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1297 ip_tunnel_info_af(tun_info) != AF_INET6))
1298 return -1;
1299 key = &tun_info->key;
1300 memset(&fl6, 0, sizeof(fl6));
1301 fl6.flowi6_proto = protocol;
1302 fl6.saddr = key->u.ipv6.src;
1303 fl6.daddr = key->u.ipv6.dst;
1304 fl6.flowlabel = key->label;
1305 dsfield = key->tos;
1306 switch (protocol) {
1307 case IPPROTO_IPIP:
1308 iph = ip_hdr(skb);
1309 orig_dsfield = ipv4_get_dsfield(iph);
1310 break;
1311 case IPPROTO_IPV6:
1312 ipv6h = ipv6_hdr(skb);
1313 orig_dsfield = ipv6_get_dsfield(ipv6h);
1314 break;
1315 default:
1316 orig_dsfield = dsfield;
1317 break;
1318 }
1319 } else {
1320 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1321 encap_limit = t->parms.encap_limit;
1322 if (protocol == IPPROTO_IPV6) {
1323 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1324 skb_network_header(skb));
1325 /* ip6_tnl_parse_tlv_enc_lim() might have
1326 * reallocated skb->head
1327 */
1328 if (offset > 0) {
1329 struct ipv6_tlv_tnl_enc_lim *tel;
1330
1331 tel = (void *)&skb_network_header(skb)[offset];
1332 if (tel->encap_limit == 0) {
1333 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1334 ICMPV6_HDR_FIELD, offset + 2);
1335 return -1;
1336 }
1337 encap_limit = tel->encap_limit - 1;
1338 }
1339 }
1340
1341 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1342 fl6.flowi6_proto = protocol;
1343
1344 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1345 fl6.flowi6_mark = skb->mark;
1346 else
1347 fl6.flowi6_mark = t->parms.fwmark;
1348 switch (protocol) {
1349 case IPPROTO_IPIP:
1350 iph = ip_hdr(skb);
1351 orig_dsfield = ipv4_get_dsfield(iph);
1352 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1353 dsfield = orig_dsfield;
1354 else
1355 dsfield = ip6_tclass(t->parms.flowinfo);
1356 break;
1357 case IPPROTO_IPV6:
1358 ipv6h = ipv6_hdr(skb);
1359 orig_dsfield = ipv6_get_dsfield(ipv6h);
1360 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1361 dsfield = orig_dsfield;
1362 else
1363 dsfield = ip6_tclass(t->parms.flowinfo);
1364 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1365 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1366 break;
1367 default:
1368 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1369 break;
1370 }
1371 }
1372
1373 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1374 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1375
1376 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1377 return -1;
1378
1379 skb_set_inner_ipproto(skb, protocol);
1380
1381 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1382 protocol);
1383 if (err != 0) {
1384 /* XXX: send ICMP error even if DF is not set. */
1385 if (err == -EMSGSIZE)
1386 switch (protocol) {
1387 case IPPROTO_IPIP:
1388 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1389 ICMP_FRAG_NEEDED, htonl(mtu));
1390 break;
1391 case IPPROTO_IPV6:
1392 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1393 break;
1394 default:
1395 break;
1396 }
1397 return -1;
1398 }
1399
1400 return 0;
1401 }
1402
1403 static netdev_tx_t
1404 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1405 {
1406 struct ip6_tnl *t = netdev_priv(dev);
1407 struct net_device_stats *stats = &t->dev->stats;
1408 u8 ipproto;
1409 int ret;
1410
1411 if (!pskb_inet_may_pull(skb))
1412 goto tx_err;
1413
1414 switch (skb->protocol) {
1415 case htons(ETH_P_IP):
1416 ipproto = IPPROTO_IPIP;
1417 break;
1418 case htons(ETH_P_IPV6):
1419 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1420 goto tx_err;
1421 ipproto = IPPROTO_IPV6;
1422 break;
1423 case htons(ETH_P_MPLS_UC):
1424 ipproto = IPPROTO_MPLS;
1425 break;
1426 default:
1427 goto tx_err;
1428 }
1429
1430 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1431 if (ret < 0)
1432 goto tx_err;
1433
1434 return NETDEV_TX_OK;
1435
1436 tx_err:
1437 stats->tx_errors++;
1438 stats->tx_dropped++;
1439 kfree_skb(skb);
1440 return NETDEV_TX_OK;
1441 }
1442
1443 static void ip6_tnl_link_config(struct ip6_tnl *t)
1444 {
1445 struct net_device *dev = t->dev;
1446 struct net_device *tdev = NULL;
1447 struct __ip6_tnl_parm *p = &t->parms;
1448 struct flowi6 *fl6 = &t->fl.u.ip6;
1449 unsigned int mtu;
1450 int t_hlen;
1451
1452 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1453 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1454
1455 /* Set up flowi template */
1456 fl6->saddr = p->laddr;
1457 fl6->daddr = p->raddr;
1458 fl6->flowi6_oif = p->link;
1459 fl6->flowlabel = 0;
1460
1461 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1462 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1463 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1464 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1465
1466 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1467 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1468
1469 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1470 dev->flags |= IFF_POINTOPOINT;
1471 else
1472 dev->flags &= ~IFF_POINTOPOINT;
1473
1474 t->tun_hlen = 0;
1475 t->hlen = t->encap_hlen + t->tun_hlen;
1476 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1477
1478 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1479 int strict = (ipv6_addr_type(&p->raddr) &
1480 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1481
1482 struct rt6_info *rt = rt6_lookup(t->net,
1483 &p->raddr, &p->laddr,
1484 p->link, NULL, strict);
1485 if (rt) {
1486 tdev = rt->dst.dev;
1487 ip6_rt_put(rt);
1488 }
1489
1490 if (!tdev && p->link)
1491 tdev = __dev_get_by_index(t->net, p->link);
1492
1493 if (tdev) {
1494 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1495 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1496
1497 dev->mtu = mtu - t_hlen;
1498 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1499 dev->mtu -= 8;
1500
1501 if (dev->mtu < IPV6_MIN_MTU)
1502 dev->mtu = IPV6_MIN_MTU;
1503 }
1504 }
1505 }
1506
1507 /**
1508 * ip6_tnl_change - update the tunnel parameters
1509 * @t: tunnel to be changed
1510 * @p: tunnel configuration parameters
1511 *
1512 * Description:
1513 * ip6_tnl_change() updates the tunnel parameters
1514 **/
1515
1516 static int
1517 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1518 {
1519 t->parms.laddr = p->laddr;
1520 t->parms.raddr = p->raddr;
1521 t->parms.flags = p->flags;
1522 t->parms.hop_limit = p->hop_limit;
1523 t->parms.encap_limit = p->encap_limit;
1524 t->parms.flowinfo = p->flowinfo;
1525 t->parms.link = p->link;
1526 t->parms.proto = p->proto;
1527 t->parms.fwmark = p->fwmark;
1528 dst_cache_reset(&t->dst_cache);
1529 ip6_tnl_link_config(t);
1530 return 0;
1531 }
1532
1533 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1534 {
1535 struct net *net = t->net;
1536 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1537 int err;
1538
1539 ip6_tnl_unlink(ip6n, t);
1540 synchronize_net();
1541 err = ip6_tnl_change(t, p);
1542 ip6_tnl_link(ip6n, t);
1543 netdev_state_change(t->dev);
1544 return err;
1545 }
1546
1547 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1548 {
1549 /* for default tnl0 device allow to change only the proto */
1550 t->parms.proto = p->proto;
1551 netdev_state_change(t->dev);
1552 return 0;
1553 }
1554
1555 static void
1556 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1557 {
1558 p->laddr = u->laddr;
1559 p->raddr = u->raddr;
1560 p->flags = u->flags;
1561 p->hop_limit = u->hop_limit;
1562 p->encap_limit = u->encap_limit;
1563 p->flowinfo = u->flowinfo;
1564 p->link = u->link;
1565 p->proto = u->proto;
1566 memcpy(p->name, u->name, sizeof(u->name));
1567 }
1568
1569 static void
1570 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1571 {
1572 u->laddr = p->laddr;
1573 u->raddr = p->raddr;
1574 u->flags = p->flags;
1575 u->hop_limit = p->hop_limit;
1576 u->encap_limit = p->encap_limit;
1577 u->flowinfo = p->flowinfo;
1578 u->link = p->link;
1579 u->proto = p->proto;
1580 memcpy(u->name, p->name, sizeof(u->name));
1581 }
1582
1583 /**
1584 * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace
1585 * @dev: virtual device associated with tunnel
1586 * @ifr: unused
1587 * @data: parameters passed from userspace
1588 * @cmd: command to be performed
1589 *
1590 * Description:
1591 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1592 * from userspace.
1593 *
1594 * The possible commands are the following:
1595 * %SIOCGETTUNNEL: get tunnel parameters for device
1596 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1597 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1598 * %SIOCDELTUNNEL: delete tunnel
1599 *
1600 * The fallback device "ip6tnl0", created during module
1601 * initialization, can be used for creating other tunnel devices.
1602 *
1603 * Return:
1604 * 0 on success,
1605 * %-EFAULT if unable to copy data to or from userspace,
1606 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1607 * %-EINVAL if passed tunnel parameters are invalid,
1608 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1609 * %-ENODEV if attempting to change or delete a nonexisting device
1610 **/
1611
1612 static int
1613 ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1614 void __user *data, int cmd)
1615 {
1616 int err = 0;
1617 struct ip6_tnl_parm p;
1618 struct __ip6_tnl_parm p1;
1619 struct ip6_tnl *t = netdev_priv(dev);
1620 struct net *net = t->net;
1621 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1622
1623 memset(&p1, 0, sizeof(p1));
1624
1625 switch (cmd) {
1626 case SIOCGETTUNNEL:
1627 if (dev == ip6n->fb_tnl_dev) {
1628 if (copy_from_user(&p, data, sizeof(p))) {
1629 err = -EFAULT;
1630 break;
1631 }
1632 ip6_tnl_parm_from_user(&p1, &p);
1633 t = ip6_tnl_locate(net, &p1, 0);
1634 if (IS_ERR(t))
1635 t = netdev_priv(dev);
1636 } else {
1637 memset(&p, 0, sizeof(p));
1638 }
1639 ip6_tnl_parm_to_user(&p, &t->parms);
1640 if (copy_to_user(data, &p, sizeof(p)))
1641 err = -EFAULT;
1642 break;
1643 case SIOCADDTUNNEL:
1644 case SIOCCHGTUNNEL:
1645 err = -EPERM;
1646 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1647 break;
1648 err = -EFAULT;
1649 if (copy_from_user(&p, data, sizeof(p)))
1650 break;
1651 err = -EINVAL;
1652 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1653 p.proto != 0)
1654 break;
1655 ip6_tnl_parm_from_user(&p1, &p);
1656 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1657 if (cmd == SIOCCHGTUNNEL) {
1658 if (!IS_ERR(t)) {
1659 if (t->dev != dev) {
1660 err = -EEXIST;
1661 break;
1662 }
1663 } else
1664 t = netdev_priv(dev);
1665 if (dev == ip6n->fb_tnl_dev)
1666 err = ip6_tnl0_update(t, &p1);
1667 else
1668 err = ip6_tnl_update(t, &p1);
1669 }
1670 if (!IS_ERR(t)) {
1671 err = 0;
1672 ip6_tnl_parm_to_user(&p, &t->parms);
1673 if (copy_to_user(data, &p, sizeof(p)))
1674 err = -EFAULT;
1675
1676 } else {
1677 err = PTR_ERR(t);
1678 }
1679 break;
1680 case SIOCDELTUNNEL:
1681 err = -EPERM;
1682 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1683 break;
1684
1685 if (dev == ip6n->fb_tnl_dev) {
1686 err = -EFAULT;
1687 if (copy_from_user(&p, data, sizeof(p)))
1688 break;
1689 err = -ENOENT;
1690 ip6_tnl_parm_from_user(&p1, &p);
1691 t = ip6_tnl_locate(net, &p1, 0);
1692 if (IS_ERR(t))
1693 break;
1694 err = -EPERM;
1695 if (t->dev == ip6n->fb_tnl_dev)
1696 break;
1697 dev = t->dev;
1698 }
1699 err = 0;
1700 unregister_netdevice(dev);
1701 break;
1702 default:
1703 err = -EINVAL;
1704 }
1705 return err;
1706 }
1707
1708 /**
1709 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1710 * @dev: virtual device associated with tunnel
1711 * @new_mtu: the new mtu
1712 *
1713 * Return:
1714 * 0 on success,
1715 * %-EINVAL if mtu too small
1716 **/
1717
1718 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1719 {
1720 struct ip6_tnl *tnl = netdev_priv(dev);
1721
1722 if (tnl->parms.proto == IPPROTO_IPV6) {
1723 if (new_mtu < IPV6_MIN_MTU)
1724 return -EINVAL;
1725 } else {
1726 if (new_mtu < ETH_MIN_MTU)
1727 return -EINVAL;
1728 }
1729 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1730 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1731 return -EINVAL;
1732 } else {
1733 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1734 return -EINVAL;
1735 }
1736 dev->mtu = new_mtu;
1737 return 0;
1738 }
1739 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1740
1741 int ip6_tnl_get_iflink(const struct net_device *dev)
1742 {
1743 struct ip6_tnl *t = netdev_priv(dev);
1744
1745 return t->parms.link;
1746 }
1747 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1748
1749 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1750 unsigned int num)
1751 {
1752 if (num >= MAX_IPTUN_ENCAP_OPS)
1753 return -ERANGE;
1754
1755 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1756 &ip6tun_encaps[num],
1757 NULL, ops) ? 0 : -1;
1758 }
1759 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1760
1761 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1762 unsigned int num)
1763 {
1764 int ret;
1765
1766 if (num >= MAX_IPTUN_ENCAP_OPS)
1767 return -ERANGE;
1768
1769 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1770 &ip6tun_encaps[num],
1771 ops, NULL) == ops) ? 0 : -1;
1772
1773 synchronize_net();
1774
1775 return ret;
1776 }
1777 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1778
1779 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1780 struct ip_tunnel_encap *ipencap)
1781 {
1782 int hlen;
1783
1784 memset(&t->encap, 0, sizeof(t->encap));
1785
1786 hlen = ip6_encap_hlen(ipencap);
1787 if (hlen < 0)
1788 return hlen;
1789
1790 t->encap.type = ipencap->type;
1791 t->encap.sport = ipencap->sport;
1792 t->encap.dport = ipencap->dport;
1793 t->encap.flags = ipencap->flags;
1794
1795 t->encap_hlen = hlen;
1796 t->hlen = t->encap_hlen + t->tun_hlen;
1797
1798 return 0;
1799 }
1800 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1801
1802 static const struct net_device_ops ip6_tnl_netdev_ops = {
1803 .ndo_init = ip6_tnl_dev_init,
1804 .ndo_uninit = ip6_tnl_dev_uninit,
1805 .ndo_start_xmit = ip6_tnl_start_xmit,
1806 .ndo_siocdevprivate = ip6_tnl_siocdevprivate,
1807 .ndo_change_mtu = ip6_tnl_change_mtu,
1808 .ndo_get_stats64 = dev_get_tstats64,
1809 .ndo_get_iflink = ip6_tnl_get_iflink,
1810 };
1811
1812 #define IPXIPX_FEATURES (NETIF_F_SG | \
1813 NETIF_F_FRAGLIST | \
1814 NETIF_F_HIGHDMA | \
1815 NETIF_F_GSO_SOFTWARE | \
1816 NETIF_F_HW_CSUM)
1817
1818 /**
1819 * ip6_tnl_dev_setup - setup virtual tunnel device
1820 * @dev: virtual device associated with tunnel
1821 *
1822 * Description:
1823 * Initialize function pointers and device parameters
1824 **/
1825
1826 static void ip6_tnl_dev_setup(struct net_device *dev)
1827 {
1828 dev->netdev_ops = &ip6_tnl_netdev_ops;
1829 dev->header_ops = &ip_tunnel_header_ops;
1830 dev->needs_free_netdev = true;
1831 dev->priv_destructor = ip6_dev_free;
1832
1833 dev->type = ARPHRD_TUNNEL6;
1834 dev->flags |= IFF_NOARP;
1835 dev->addr_len = sizeof(struct in6_addr);
1836 dev->features |= NETIF_F_LLTX;
1837 netif_keep_dst(dev);
1838
1839 dev->features |= IPXIPX_FEATURES;
1840 dev->hw_features |= IPXIPX_FEATURES;
1841
1842 /* This perm addr will be used as interface identifier by IPv6 */
1843 dev->addr_assign_type = NET_ADDR_RANDOM;
1844 eth_random_addr(dev->perm_addr);
1845 }
1846
1847
1848 /**
1849 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1850 * @dev: virtual device associated with tunnel
1851 **/
1852
1853 static inline int
1854 ip6_tnl_dev_init_gen(struct net_device *dev)
1855 {
1856 struct ip6_tnl *t = netdev_priv(dev);
1857 int ret;
1858 int t_hlen;
1859
1860 t->dev = dev;
1861 t->net = dev_net(dev);
1862 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1863 if (!dev->tstats)
1864 return -ENOMEM;
1865
1866 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1867 if (ret)
1868 goto free_stats;
1869
1870 ret = gro_cells_init(&t->gro_cells, dev);
1871 if (ret)
1872 goto destroy_dst;
1873
1874 t->tun_hlen = 0;
1875 t->hlen = t->encap_hlen + t->tun_hlen;
1876 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1877
1878 dev->type = ARPHRD_TUNNEL6;
1879 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1880 dev->mtu = ETH_DATA_LEN - t_hlen;
1881 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1882 dev->mtu -= 8;
1883 dev->min_mtu = ETH_MIN_MTU;
1884 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1885
1886 dev_hold(dev);
1887 return 0;
1888
1889 destroy_dst:
1890 dst_cache_destroy(&t->dst_cache);
1891 free_stats:
1892 free_percpu(dev->tstats);
1893 dev->tstats = NULL;
1894
1895 return ret;
1896 }
1897
1898 /**
1899 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1900 * @dev: virtual device associated with tunnel
1901 **/
1902
1903 static int ip6_tnl_dev_init(struct net_device *dev)
1904 {
1905 struct ip6_tnl *t = netdev_priv(dev);
1906 int err = ip6_tnl_dev_init_gen(dev);
1907
1908 if (err)
1909 return err;
1910 ip6_tnl_link_config(t);
1911 if (t->parms.collect_md)
1912 netif_keep_dst(dev);
1913 return 0;
1914 }
1915
1916 /**
1917 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1918 * @dev: fallback device
1919 *
1920 * Return: 0
1921 **/
1922
1923 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1924 {
1925 struct ip6_tnl *t = netdev_priv(dev);
1926 struct net *net = dev_net(dev);
1927 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1928
1929 t->parms.proto = IPPROTO_IPV6;
1930
1931 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1932 return 0;
1933 }
1934
1935 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1936 struct netlink_ext_ack *extack)
1937 {
1938 u8 proto;
1939
1940 if (!data || !data[IFLA_IPTUN_PROTO])
1941 return 0;
1942
1943 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1944 if (proto != IPPROTO_IPV6 &&
1945 proto != IPPROTO_IPIP &&
1946 proto != 0)
1947 return -EINVAL;
1948
1949 return 0;
1950 }
1951
1952 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1953 struct __ip6_tnl_parm *parms)
1954 {
1955 memset(parms, 0, sizeof(*parms));
1956
1957 if (!data)
1958 return;
1959
1960 if (data[IFLA_IPTUN_LINK])
1961 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1962
1963 if (data[IFLA_IPTUN_LOCAL])
1964 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1965
1966 if (data[IFLA_IPTUN_REMOTE])
1967 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1968
1969 if (data[IFLA_IPTUN_TTL])
1970 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1971
1972 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1973 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1974
1975 if (data[IFLA_IPTUN_FLOWINFO])
1976 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1977
1978 if (data[IFLA_IPTUN_FLAGS])
1979 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1980
1981 if (data[IFLA_IPTUN_PROTO])
1982 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1983
1984 if (data[IFLA_IPTUN_COLLECT_METADATA])
1985 parms->collect_md = true;
1986
1987 if (data[IFLA_IPTUN_FWMARK])
1988 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1989 }
1990
1991 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1992 struct ip_tunnel_encap *ipencap)
1993 {
1994 bool ret = false;
1995
1996 memset(ipencap, 0, sizeof(*ipencap));
1997
1998 if (!data)
1999 return ret;
2000
2001 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2002 ret = true;
2003 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2004 }
2005
2006 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2007 ret = true;
2008 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2009 }
2010
2011 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2012 ret = true;
2013 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2014 }
2015
2016 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2017 ret = true;
2018 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2019 }
2020
2021 return ret;
2022 }
2023
2024 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2025 struct nlattr *tb[], struct nlattr *data[],
2026 struct netlink_ext_ack *extack)
2027 {
2028 struct net *net = dev_net(dev);
2029 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2030 struct ip_tunnel_encap ipencap;
2031 struct ip6_tnl *nt, *t;
2032 int err;
2033
2034 nt = netdev_priv(dev);
2035
2036 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2037 err = ip6_tnl_encap_setup(nt, &ipencap);
2038 if (err < 0)
2039 return err;
2040 }
2041
2042 ip6_tnl_netlink_parms(data, &nt->parms);
2043
2044 if (nt->parms.collect_md) {
2045 if (rtnl_dereference(ip6n->collect_md_tun))
2046 return -EEXIST;
2047 } else {
2048 t = ip6_tnl_locate(net, &nt->parms, 0);
2049 if (!IS_ERR(t))
2050 return -EEXIST;
2051 }
2052
2053 err = ip6_tnl_create2(dev);
2054 if (!err && tb[IFLA_MTU])
2055 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2056
2057 return err;
2058 }
2059
2060 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2061 struct nlattr *data[],
2062 struct netlink_ext_ack *extack)
2063 {
2064 struct ip6_tnl *t = netdev_priv(dev);
2065 struct __ip6_tnl_parm p;
2066 struct net *net = t->net;
2067 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2068 struct ip_tunnel_encap ipencap;
2069
2070 if (dev == ip6n->fb_tnl_dev)
2071 return -EINVAL;
2072
2073 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2074 int err = ip6_tnl_encap_setup(t, &ipencap);
2075
2076 if (err < 0)
2077 return err;
2078 }
2079 ip6_tnl_netlink_parms(data, &p);
2080 if (p.collect_md)
2081 return -EINVAL;
2082
2083 t = ip6_tnl_locate(net, &p, 0);
2084 if (!IS_ERR(t)) {
2085 if (t->dev != dev)
2086 return -EEXIST;
2087 } else
2088 t = netdev_priv(dev);
2089
2090 return ip6_tnl_update(t, &p);
2091 }
2092
2093 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2094 {
2095 struct net *net = dev_net(dev);
2096 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2097
2098 if (dev != ip6n->fb_tnl_dev)
2099 unregister_netdevice_queue(dev, head);
2100 }
2101
2102 static size_t ip6_tnl_get_size(const struct net_device *dev)
2103 {
2104 return
2105 /* IFLA_IPTUN_LINK */
2106 nla_total_size(4) +
2107 /* IFLA_IPTUN_LOCAL */
2108 nla_total_size(sizeof(struct in6_addr)) +
2109 /* IFLA_IPTUN_REMOTE */
2110 nla_total_size(sizeof(struct in6_addr)) +
2111 /* IFLA_IPTUN_TTL */
2112 nla_total_size(1) +
2113 /* IFLA_IPTUN_ENCAP_LIMIT */
2114 nla_total_size(1) +
2115 /* IFLA_IPTUN_FLOWINFO */
2116 nla_total_size(4) +
2117 /* IFLA_IPTUN_FLAGS */
2118 nla_total_size(4) +
2119 /* IFLA_IPTUN_PROTO */
2120 nla_total_size(1) +
2121 /* IFLA_IPTUN_ENCAP_TYPE */
2122 nla_total_size(2) +
2123 /* IFLA_IPTUN_ENCAP_FLAGS */
2124 nla_total_size(2) +
2125 /* IFLA_IPTUN_ENCAP_SPORT */
2126 nla_total_size(2) +
2127 /* IFLA_IPTUN_ENCAP_DPORT */
2128 nla_total_size(2) +
2129 /* IFLA_IPTUN_COLLECT_METADATA */
2130 nla_total_size(0) +
2131 /* IFLA_IPTUN_FWMARK */
2132 nla_total_size(4) +
2133 0;
2134 }
2135
2136 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2137 {
2138 struct ip6_tnl *tunnel = netdev_priv(dev);
2139 struct __ip6_tnl_parm *parm = &tunnel->parms;
2140
2141 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2142 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2143 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2144 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2145 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2146 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2147 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2148 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2149 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2150 goto nla_put_failure;
2151
2152 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2153 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2154 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2155 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2156 goto nla_put_failure;
2157
2158 if (parm->collect_md)
2159 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2160 goto nla_put_failure;
2161
2162 return 0;
2163
2164 nla_put_failure:
2165 return -EMSGSIZE;
2166 }
2167
2168 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2169 {
2170 struct ip6_tnl *tunnel = netdev_priv(dev);
2171
2172 return tunnel->net;
2173 }
2174 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2175
2176 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2177 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2178 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2179 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2180 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2181 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2182 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2183 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2184 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2185 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2186 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2187 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2188 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2189 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2190 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2191 };
2192
2193 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2194 .kind = "ip6tnl",
2195 .maxtype = IFLA_IPTUN_MAX,
2196 .policy = ip6_tnl_policy,
2197 .priv_size = sizeof(struct ip6_tnl),
2198 .setup = ip6_tnl_dev_setup,
2199 .validate = ip6_tnl_validate,
2200 .newlink = ip6_tnl_newlink,
2201 .changelink = ip6_tnl_changelink,
2202 .dellink = ip6_tnl_dellink,
2203 .get_size = ip6_tnl_get_size,
2204 .fill_info = ip6_tnl_fill_info,
2205 .get_link_net = ip6_tnl_get_link_net,
2206 };
2207
2208 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2209 .handler = ip4ip6_rcv,
2210 .err_handler = ip4ip6_err,
2211 .priority = 1,
2212 };
2213
2214 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2215 .handler = ip6ip6_rcv,
2216 .err_handler = ip6ip6_err,
2217 .priority = 1,
2218 };
2219
2220 static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2221 .handler = mplsip6_rcv,
2222 .err_handler = mplsip6_err,
2223 .priority = 1,
2224 };
2225
2226 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2227 {
2228 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2229 struct net_device *dev, *aux;
2230 int h;
2231 struct ip6_tnl *t;
2232
2233 for_each_netdev_safe(net, dev, aux)
2234 if (dev->rtnl_link_ops == &ip6_link_ops)
2235 unregister_netdevice_queue(dev, list);
2236
2237 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2238 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2239 while (t) {
2240 /* If dev is in the same netns, it has already
2241 * been added to the list by the previous loop.
2242 */
2243 if (!net_eq(dev_net(t->dev), net))
2244 unregister_netdevice_queue(t->dev, list);
2245 t = rtnl_dereference(t->next);
2246 }
2247 }
2248
2249 t = rtnl_dereference(ip6n->tnls_wc[0]);
2250 while (t) {
2251 /* If dev is in the same netns, it has already
2252 * been added to the list by the previous loop.
2253 */
2254 if (!net_eq(dev_net(t->dev), net))
2255 unregister_netdevice_queue(t->dev, list);
2256 t = rtnl_dereference(t->next);
2257 }
2258 }
2259
2260 static int __net_init ip6_tnl_init_net(struct net *net)
2261 {
2262 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2263 struct ip6_tnl *t = NULL;
2264 int err;
2265
2266 ip6n->tnls[0] = ip6n->tnls_wc;
2267 ip6n->tnls[1] = ip6n->tnls_r_l;
2268
2269 if (!net_has_fallback_tunnels(net))
2270 return 0;
2271 err = -ENOMEM;
2272 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2273 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2274
2275 if (!ip6n->fb_tnl_dev)
2276 goto err_alloc_dev;
2277 dev_net_set(ip6n->fb_tnl_dev, net);
2278 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2279 /* FB netdevice is special: we have one, and only one per netns.
2280 * Allowing to move it to another netns is clearly unsafe.
2281 */
2282 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2283
2284 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2285 if (err < 0)
2286 goto err_register;
2287
2288 err = register_netdev(ip6n->fb_tnl_dev);
2289 if (err < 0)
2290 goto err_register;
2291
2292 t = netdev_priv(ip6n->fb_tnl_dev);
2293
2294 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2295 return 0;
2296
2297 err_register:
2298 free_netdev(ip6n->fb_tnl_dev);
2299 err_alloc_dev:
2300 return err;
2301 }
2302
2303 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2304 {
2305 struct net *net;
2306 LIST_HEAD(list);
2307
2308 rtnl_lock();
2309 list_for_each_entry(net, net_list, exit_list)
2310 ip6_tnl_destroy_tunnels(net, &list);
2311 unregister_netdevice_many(&list);
2312 rtnl_unlock();
2313 }
2314
2315 static struct pernet_operations ip6_tnl_net_ops = {
2316 .init = ip6_tnl_init_net,
2317 .exit_batch = ip6_tnl_exit_batch_net,
2318 .id = &ip6_tnl_net_id,
2319 .size = sizeof(struct ip6_tnl_net),
2320 };
2321
2322 /**
2323 * ip6_tunnel_init - register protocol and reserve needed resources
2324 *
2325 * Return: 0 on success
2326 **/
2327
2328 static int __init ip6_tunnel_init(void)
2329 {
2330 int err;
2331
2332 if (!ipv6_mod_enabled())
2333 return -EOPNOTSUPP;
2334
2335 err = register_pernet_device(&ip6_tnl_net_ops);
2336 if (err < 0)
2337 goto out_pernet;
2338
2339 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2340 if (err < 0) {
2341 pr_err("%s: can't register ip4ip6\n", __func__);
2342 goto out_ip4ip6;
2343 }
2344
2345 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2346 if (err < 0) {
2347 pr_err("%s: can't register ip6ip6\n", __func__);
2348 goto out_ip6ip6;
2349 }
2350
2351 if (ip6_tnl_mpls_supported()) {
2352 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2353 if (err < 0) {
2354 pr_err("%s: can't register mplsip6\n", __func__);
2355 goto out_mplsip6;
2356 }
2357 }
2358
2359 err = rtnl_link_register(&ip6_link_ops);
2360 if (err < 0)
2361 goto rtnl_link_failed;
2362
2363 return 0;
2364
2365 rtnl_link_failed:
2366 if (ip6_tnl_mpls_supported())
2367 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2368 out_mplsip6:
2369 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2370 out_ip6ip6:
2371 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2372 out_ip4ip6:
2373 unregister_pernet_device(&ip6_tnl_net_ops);
2374 out_pernet:
2375 return err;
2376 }
2377
2378 /**
2379 * ip6_tunnel_cleanup - free resources and unregister protocol
2380 **/
2381
2382 static void __exit ip6_tunnel_cleanup(void)
2383 {
2384 rtnl_link_unregister(&ip6_link_ops);
2385 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2386 pr_info("%s: can't deregister ip4ip6\n", __func__);
2387
2388 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2389 pr_info("%s: can't deregister ip6ip6\n", __func__);
2390
2391 if (ip6_tnl_mpls_supported() &&
2392 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2393 pr_info("%s: can't deregister mplsip6\n", __func__);
2394 unregister_pernet_device(&ip6_tnl_net_ops);
2395 }
2396
2397 module_init(ip6_tunnel_init);
2398 module_exit(ip6_tunnel_cleanup);
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