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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 tunneling device
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Ville Nuorvala <[email protected]>
8 * Yasuyuki Kozakai <[email protected]>
9 *
10 * Based on:
11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
12 *
13 * RFC 2473
14 */
15
16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/module.h>
19#include <linux/capability.h>
20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/sockios.h>
23#include <linux/icmp.h>
24#include <linux/if.h>
25#include <linux/in.h>
26#include <linux/ip.h>
27#include <linux/net.h>
28#include <linux/in6.h>
29#include <linux/netdevice.h>
30#include <linux/if_arp.h>
31#include <linux/icmpv6.h>
32#include <linux/init.h>
33#include <linux/route.h>
34#include <linux/rtnetlink.h>
35#include <linux/netfilter_ipv6.h>
36#include <linux/slab.h>
37#include <linux/hash.h>
38#include <linux/etherdevice.h>
39
40#include <linux/uaccess.h>
41#include <linux/atomic.h>
42
43#include <net/icmp.h>
44#include <net/ip.h>
45#include <net/ip_tunnels.h>
46#include <net/ipv6.h>
47#include <net/ip6_route.h>
48#include <net/addrconf.h>
49#include <net/ip6_tunnel.h>
50#include <net/xfrm.h>
51#include <net/dsfield.h>
52#include <net/inet_ecn.h>
53#include <net/net_namespace.h>
54#include <net/netns/generic.h>
55#include <net/netdev_lock.h>
56#include <net/dst_metadata.h>
57#include <net/inet_dscp.h>
58
59MODULE_AUTHOR("Ville Nuorvala");
60MODULE_DESCRIPTION("IPv6 tunneling device");
61MODULE_LICENSE("GPL");
62MODULE_ALIAS_RTNL_LINK("ip6tnl");
63MODULE_ALIAS_NETDEV("ip6tnl0");
64
65#define IP6_TUNNEL_MAX_DEST_TLVS 8
66
67#define IP6_TUNNEL_HASH_SIZE_SHIFT 5
68#define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
69
70static bool log_ecn_error = true;
71module_param(log_ecn_error, bool, 0644);
72MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
73
74static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
75{
76 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
77
78 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
79}
80
81static int ip6_tnl_dev_init(struct net_device *dev);
82static void ip6_tnl_dev_setup(struct net_device *dev);
83static struct rtnl_link_ops ip6_link_ops __read_mostly;
84
85static unsigned int ip6_tnl_net_id __read_mostly;
86struct ip6_tnl_net {
87 /* the IPv6 tunnel fallback device */
88 struct net_device *fb_tnl_dev;
89 /* lists for storing tunnels in use */
90 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
91 struct ip6_tnl __rcu *tnls_wc[1];
92 struct ip6_tnl __rcu **tnls[2];
93 struct ip6_tnl __rcu *collect_md_tun;
94};
95
96static inline int ip6_tnl_mpls_supported(void)
97{
98 return IS_ENABLED(CONFIG_MPLS);
99}
100
101/**
102 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
103 * @net: network namespace
104 * @link: ifindex of underlying interface
105 * @remote: the address of the tunnel exit-point
106 * @local: the address of the tunnel entry-point
107 *
108 * Return:
109 * tunnel matching given end-points if found,
110 * else fallback tunnel if its device is up,
111 * else %NULL
112 **/
113
114static struct ip6_tnl *
115ip6_tnl_lookup(struct net *net, int link,
116 const struct in6_addr *remote, const struct in6_addr *local)
117{
118 unsigned int hash = HASH(remote, local);
119 struct ip6_tnl *t, *cand = NULL;
120 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
121 struct in6_addr any;
122
123 for_each_ip_tunnel_rcu(t, ip6n->tnls_r_l[hash]) {
124 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
125 !ipv6_addr_equal(remote, &t->parms.raddr) ||
126 !(t->dev->flags & IFF_UP))
127 continue;
128
129 if (link == t->parms.link)
130 return t;
131 else
132 cand = t;
133 }
134
135 memset(&any, 0, sizeof(any));
136 hash = HASH(&any, local);
137 for_each_ip_tunnel_rcu(t, ip6n->tnls_r_l[hash]) {
138 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
139 !ipv6_addr_any(&t->parms.raddr) ||
140 !(t->dev->flags & IFF_UP))
141 continue;
142
143 if (link == t->parms.link)
144 return t;
145 else if (!cand)
146 cand = t;
147 }
148
149 hash = HASH(remote, &any);
150 for_each_ip_tunnel_rcu(t, ip6n->tnls_r_l[hash]) {
151 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
152 !ipv6_addr_any(&t->parms.laddr) ||
153 !(t->dev->flags & IFF_UP))
154 continue;
155
156 if (link == t->parms.link)
157 return t;
158 else if (!cand)
159 cand = t;
160 }
161
162 if (cand)
163 return cand;
164
165 t = rcu_dereference(ip6n->collect_md_tun);
166 if (t && t->dev->flags & IFF_UP)
167 return t;
168
169 t = rcu_dereference(ip6n->tnls_wc[0]);
170 if (t && (t->dev->flags & IFF_UP))
171 return t;
172
173 return NULL;
174}
175
176/**
177 * ip6_tnl_bucket - get head of list matching given tunnel parameters
178 * @ip6n: the private data for ip6_vti in the netns
179 * @p: parameters containing tunnel end-points
180 *
181 * Description:
182 * ip6_tnl_bucket() returns the head of the list matching the
183 * &struct in6_addr entries laddr and raddr in @p.
184 *
185 * Return: head of IPv6 tunnel list
186 **/
187
188static struct ip6_tnl __rcu **
189ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
190{
191 const struct in6_addr *remote = &p->raddr;
192 const struct in6_addr *local = &p->laddr;
193 unsigned int h = 0;
194 int prio = 0;
195
196 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
197 prio = 1;
198 h = HASH(remote, local);
199 }
200 return &ip6n->tnls[prio][h];
201}
202
203/**
204 * ip6_tnl_link - add tunnel to hash table
205 * @ip6n: the private data for ip6_vti in the netns
206 * @t: tunnel to be added
207 **/
208
209static void
210ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
211{
212 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
213
214 if (t->parms.collect_md)
215 rcu_assign_pointer(ip6n->collect_md_tun, t);
216 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
217 rcu_assign_pointer(*tp, t);
218}
219
220/**
221 * ip6_tnl_unlink - remove tunnel from hash table
222 * @ip6n: the private data for ip6_vti in the netns
223 * @t: tunnel to be removed
224 **/
225
226static void
227ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
228{
229 struct ip6_tnl __rcu **tp;
230 struct ip6_tnl *iter;
231
232 if (t->parms.collect_md)
233 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
234
235 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
236 (iter = rtnl_dereference(*tp)) != NULL;
237 tp = &iter->next) {
238 if (t == iter) {
239 rcu_assign_pointer(*tp, t->next);
240 break;
241 }
242 }
243}
244
245static void ip6_dev_free(struct net_device *dev)
246{
247 struct ip6_tnl *t = netdev_priv(dev);
248
249 gro_cells_destroy(&t->gro_cells);
250 dst_cache_destroy(&t->dst_cache);
251}
252
253static int ip6_tnl_create2(struct net_device *dev)
254{
255 struct ip6_tnl *t = netdev_priv(dev);
256 struct ip6_tnl_net *ip6n = net_generic(t->net, ip6_tnl_net_id);
257 int err;
258
259 dev->rtnl_link_ops = &ip6_link_ops;
260 err = register_netdevice(dev);
261 if (err < 0)
262 goto out;
263
264 strcpy(t->parms.name, dev->name);
265
266 ip6_tnl_link(ip6n, t);
267 return 0;
268
269out:
270 return err;
271}
272
273/**
274 * ip6_tnl_create - create a new tunnel
275 * @net: network namespace
276 * @p: tunnel parameters
277 *
278 * Description:
279 * Create tunnel matching given parameters.
280 *
281 * Return:
282 * created tunnel or error pointer
283 **/
284
285static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
286{
287 struct net_device *dev;
288 struct ip6_tnl *t;
289 char name[IFNAMSIZ];
290 int err = -E2BIG;
291
292 if (p->name[0]) {
293 if (!dev_valid_name(p->name))
294 goto failed;
295 strscpy(name, p->name, IFNAMSIZ);
296 } else {
297 sprintf(name, "ip6tnl%%d");
298 }
299 err = -ENOMEM;
300 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
301 ip6_tnl_dev_setup);
302 if (!dev)
303 goto failed;
304
305 dev_net_set(dev, net);
306
307 t = netdev_priv(dev);
308 t->parms = *p;
309 t->net = dev_net(dev);
310 err = ip6_tnl_create2(dev);
311 if (err < 0)
312 goto failed_free;
313
314 return t;
315
316failed_free:
317 free_netdev(dev);
318failed:
319 return ERR_PTR(err);
320}
321
322/**
323 * ip6_tnl_locate - find or create tunnel matching given parameters
324 * @net: network namespace
325 * @p: tunnel parameters
326 * @create: != 0 if allowed to create new tunnel if no match found
327 *
328 * Description:
329 * ip6_tnl_locate() first tries to locate an existing tunnel
330 * based on @parms. If this is unsuccessful, but @create is set a new
331 * tunnel device is created and registered for use.
332 *
333 * Return:
334 * matching tunnel or error pointer
335 **/
336
337static struct ip6_tnl *ip6_tnl_locate(struct net *net,
338 struct __ip6_tnl_parm *p, int create)
339{
340 const struct in6_addr *remote = &p->raddr;
341 const struct in6_addr *local = &p->laddr;
342 struct ip6_tnl __rcu **tp;
343 struct ip6_tnl *t;
344 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
345
346 for (tp = ip6_tnl_bucket(ip6n, p);
347 (t = rtnl_dereference(*tp)) != NULL;
348 tp = &t->next) {
349 if (ipv6_addr_equal(local, &t->parms.laddr) &&
350 ipv6_addr_equal(remote, &t->parms.raddr) &&
351 p->link == t->parms.link) {
352 if (create)
353 return ERR_PTR(-EEXIST);
354
355 return t;
356 }
357 }
358 if (!create)
359 return ERR_PTR(-ENODEV);
360 return ip6_tnl_create(net, p);
361}
362
363/**
364 * ip6_tnl_dev_uninit - tunnel device uninitializer
365 * @dev: the device to be destroyed
366 *
367 * Description:
368 * ip6_tnl_dev_uninit() removes tunnel from its list
369 **/
370
371static void
372ip6_tnl_dev_uninit(struct net_device *dev)
373{
374 struct ip6_tnl *t = netdev_priv(dev);
375 struct net *net = t->net;
376 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
377
378 if (dev == ip6n->fb_tnl_dev)
379 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
380 else
381 ip6_tnl_unlink(ip6n, t);
382 dst_cache_reset(&t->dst_cache);
383 netdev_put(dev, &t->dev_tracker);
384}
385
386/**
387 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option
388 * @skb: received socket buffer
389 * @raw: the ICMPv6 error message data
390 *
391 * Return:
392 * 0 if none was found,
393 * else index to encapsulation limit
394 **/
395
396__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
397{
398 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
399 unsigned int nhoff = raw - skb->data;
400 unsigned int off = nhoff + sizeof(*ipv6h);
401 u8 nexthdr = ipv6h->nexthdr;
402 int exthdr_cnt = 0;
403
404 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
405 struct ipv6_opt_hdr *hdr;
406 u16 optlen;
407
408 if (unlikely(exthdr_cnt++ >= IP6_MAX_EXT_HDRS_CNT))
409 break;
410
411 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
412 break;
413
414 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
415 if (nexthdr == NEXTHDR_FRAGMENT) {
416 optlen = 8;
417 } else if (nexthdr == NEXTHDR_AUTH) {
418 optlen = ipv6_authlen(hdr);
419 } else {
420 optlen = ipv6_optlen(hdr);
421 }
422
423 if (!pskb_may_pull(skb, off + optlen))
424 break;
425
426 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
427 if (nexthdr == NEXTHDR_FRAGMENT) {
428 struct frag_hdr *frag_hdr = (struct frag_hdr *)hdr;
429
430 if (frag_hdr->frag_off)
431 break;
432 }
433 if (nexthdr == NEXTHDR_DEST) {
434 int tlv_cnt = 0;
435 u16 i = 2;
436
437 while (1) {
438 struct ipv6_tlv_tnl_enc_lim *tel;
439
440 if (unlikely(tlv_cnt++ >= IP6_TUNNEL_MAX_DEST_TLVS))
441 break;
442
443 /* No more room for encapsulation limit */
444 if (i + sizeof(*tel) > optlen)
445 break;
446
447 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
448 /* return index of option if found and valid */
449 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
450 tel->length == 1)
451 return i + off - nhoff;
452 /* else jump to next option */
453 if (tel->type)
454 i += tel->length + 2;
455 else
456 i++;
457 }
458 }
459 nexthdr = hdr->nexthdr;
460 off += optlen;
461 }
462 return 0;
463}
464EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
465
466/* ip6_tnl_err() should handle errors in the tunnel according to the
467 * specifications in RFC 2473.
468 */
469static int
470ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
471 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
472{
473 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
474 struct net *net = dev_net(skb->dev);
475 u8 rel_type = ICMPV6_DEST_UNREACH;
476 u8 rel_code = ICMPV6_ADDR_UNREACH;
477 __u32 rel_info = 0;
478 struct ip6_tnl *t;
479 int err = -ENOENT;
480 int rel_msg = 0;
481 u8 tproto;
482 __u16 len;
483
484 /* If the packet doesn't contain the original IPv6 header we are
485 in trouble since we might need the source address for further
486 processing of the error. */
487
488 rcu_read_lock();
489 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
490 if (!t)
491 goto out;
492
493 tproto = READ_ONCE(t->parms.proto);
494 if (tproto != ipproto && tproto != 0)
495 goto out;
496
497 err = 0;
498
499 switch (*type) {
500 case ICMPV6_DEST_UNREACH:
501 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
502 t->parms.name);
503 rel_msg = 1;
504 break;
505 case ICMPV6_TIME_EXCEED:
506 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
507 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
508 t->parms.name);
509 rel_msg = 1;
510 }
511 break;
512 case ICMPV6_PARAMPROB: {
513 struct ipv6_tlv_tnl_enc_lim *tel;
514 __u32 teli;
515
516 teli = 0;
517 if ((*code) == ICMPV6_HDR_FIELD)
518 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
519
520 if (teli && teli == *info - 2) {
521 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
522 if (tel->encap_limit == 0) {
523 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
524 t->parms.name);
525 rel_msg = 1;
526 }
527 } else {
528 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
529 t->parms.name);
530 }
531 break;
532 }
533 case ICMPV6_PKT_TOOBIG: {
534 __u32 mtu;
535
536 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
537 sock_net_uid(net, NULL));
538 mtu = *info - offset;
539 if (mtu < IPV6_MIN_MTU)
540 mtu = IPV6_MIN_MTU;
541 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
542 if (len > mtu) {
543 rel_type = ICMPV6_PKT_TOOBIG;
544 rel_code = 0;
545 rel_info = mtu;
546 rel_msg = 1;
547 }
548 break;
549 }
550 case NDISC_REDIRECT:
551 ip6_redirect(skb, net, skb->dev->ifindex, 0,
552 sock_net_uid(net, NULL));
553 break;
554 }
555
556 *type = rel_type;
557 *code = rel_code;
558 *info = rel_info;
559 *msg = rel_msg;
560
561out:
562 rcu_read_unlock();
563 return err;
564}
565
566static int
567ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
568 u8 type, u8 code, int offset, __be32 info)
569{
570 __u32 rel_info = ntohl(info);
571 const struct iphdr *eiph;
572 struct sk_buff *skb2;
573 int err, rel_msg = 0;
574 u8 rel_type = type;
575 u8 rel_code = code;
576 struct rtable *rt;
577 struct flowi4 fl4;
578
579 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
580 &rel_msg, &rel_info, offset);
581 if (err < 0)
582 return err;
583
584 if (rel_msg == 0)
585 return 0;
586
587 switch (rel_type) {
588 case ICMPV6_DEST_UNREACH:
589 if (rel_code != ICMPV6_ADDR_UNREACH)
590 return 0;
591 rel_type = ICMP_DEST_UNREACH;
592 rel_code = ICMP_HOST_UNREACH;
593 break;
594 case ICMPV6_PKT_TOOBIG:
595 if (rel_code != 0)
596 return 0;
597 rel_type = ICMP_DEST_UNREACH;
598 rel_code = ICMP_FRAG_NEEDED;
599 break;
600 default:
601 return 0;
602 }
603
604 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
605 return 0;
606
607 skb2 = skb_clone(skb, GFP_ATOMIC);
608 if (!skb2)
609 return 0;
610
611 /* Remove debris left by IPv6 stack. */
612 memset(IPCB(skb2), 0, sizeof(*IPCB(skb2)));
613
614 skb_dst_drop(skb2);
615
616 skb_pull(skb2, offset);
617 skb_reset_network_header(skb2);
618 eiph = ip_hdr(skb2);
619 if (eiph->version != 4 || eiph->ihl < 5)
620 goto out;
621
622 /* Try to guess incoming interface */
623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
624 0, 0, 0, IPPROTO_IPIP,
625 eiph->tos & INET_DSCP_MASK, 0);
626 if (IS_ERR(rt))
627 goto out;
628
629 skb2->dev = rt->dst.dev;
630 ip_rt_put(rt);
631
632 /* route "incoming" packet */
633 if (rt->rt_flags & RTCF_LOCAL) {
634 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
635 eiph->daddr, eiph->saddr, 0, 0,
636 IPPROTO_IPIP,
637 eiph->tos & INET_DSCP_MASK, 0);
638 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
639 if (!IS_ERR(rt))
640 ip_rt_put(rt);
641 goto out;
642 }
643 skb_dst_set(skb2, &rt->dst);
644 } else {
645 if (ip_route_input(skb2, eiph->daddr, eiph->saddr,
646 ip4h_dscp(eiph), skb2->dev) ||
647 skb_dst_dev(skb2)->type != ARPHRD_TUNNEL6)
648 goto out;
649 }
650
651 /* change mtu on this route */
652 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
653 if (rel_info > dst4_mtu(skb_dst(skb2)))
654 goto out;
655
656 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
657 }
658
659 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
660
661out:
662 kfree_skb(skb2);
663 return 0;
664}
665
666static int
667ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
668 u8 type, u8 code, int offset, __be32 info)
669{
670 __u32 rel_info = ntohl(info);
671 int err, rel_msg = 0;
672 u8 rel_type = type;
673 u8 rel_code = code;
674
675 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
676 &rel_msg, &rel_info, offset);
677 if (err < 0)
678 return err;
679
680 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
681 struct rt6_info *rt;
682 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
683
684 if (!skb2)
685 return 0;
686
687 /* Remove debris left by outer IPv6 stack. */
688 memset(IP6CB(skb2), 0, sizeof(*IP6CB(skb2)));
689
690 skb_dst_drop(skb2);
691 skb_pull(skb2, offset);
692 skb_reset_network_header(skb2);
693
694 /* Try to guess incoming interface */
695 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
696 NULL, 0, skb2, 0);
697
698 if (rt && rt->dst.dev)
699 skb2->dev = rt->dst.dev;
700
701 icmpv6_send(skb2, rel_type, rel_code, rel_info);
702
703 ip6_rt_put(rt);
704
705 kfree_skb(skb2);
706 }
707
708 return 0;
709}
710
711static int
712mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
713 u8 type, u8 code, int offset, __be32 info)
714{
715 __u32 rel_info = ntohl(info);
716 int err, rel_msg = 0;
717 u8 rel_type = type;
718 u8 rel_code = code;
719
720 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code,
721 &rel_msg, &rel_info, offset);
722 return err;
723}
724
725static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
726 const struct ipv6hdr *ipv6h,
727 struct sk_buff *skb)
728{
729 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
730
731 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
732 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
733
734 return IP6_ECN_decapsulate(ipv6h, skb);
735}
736
737static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
738 const struct ipv6hdr *ipv6h,
739 struct sk_buff *skb)
740{
741 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
742 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
743
744 return IP6_ECN_decapsulate(ipv6h, skb);
745}
746
747static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
748 const struct ipv6hdr *ipv6h,
749 struct sk_buff *skb)
750{
751 /* ECN is not supported in AF_MPLS */
752 return 0;
753}
754
755__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
756 const struct in6_addr *laddr,
757 const struct in6_addr *raddr)
758{
759 struct __ip6_tnl_parm *p = &t->parms;
760 int ltype = ipv6_addr_type(laddr);
761 int rtype = ipv6_addr_type(raddr);
762 __u32 flags = 0;
763
764 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
765 flags = IP6_TNL_F_CAP_PER_PACKET;
766 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
767 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
768 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
769 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
770 if (ltype&IPV6_ADDR_UNICAST)
771 flags |= IP6_TNL_F_CAP_XMIT;
772 if (rtype&IPV6_ADDR_UNICAST)
773 flags |= IP6_TNL_F_CAP_RCV;
774 }
775 return flags;
776}
777EXPORT_SYMBOL(ip6_tnl_get_cap);
778
779/* called with rcu_read_lock() */
780int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
781 const struct in6_addr *laddr,
782 const struct in6_addr *raddr)
783{
784 struct __ip6_tnl_parm *p = &t->parms;
785 int ret = 0;
786 struct net *net = t->net;
787
788 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
789 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
790 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
791 struct net_device *ldev = NULL;
792
793 if (p->link)
794 ldev = dev_get_by_index_rcu(net, p->link);
795
796 if ((ipv6_addr_is_multicast(laddr) ||
797 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
798 0, IFA_F_TENTATIVE))) &&
799 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
800 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
801 0, IFA_F_TENTATIVE))))
802 ret = 1;
803 }
804 return ret;
805}
806EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
807
808static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
809 const struct tnl_ptk_info *tpi,
810 struct metadata_dst *tun_dst,
811 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
812 const struct ipv6hdr *ipv6h,
813 struct sk_buff *skb),
814 bool log_ecn_err)
815{
816 const struct ipv6hdr *ipv6h;
817 int nh, err;
818
819 if (test_bit(IP_TUNNEL_CSUM_BIT, tunnel->parms.i_flags) !=
820 test_bit(IP_TUNNEL_CSUM_BIT, tpi->flags)) {
821 DEV_STATS_INC(tunnel->dev, rx_crc_errors);
822 DEV_STATS_INC(tunnel->dev, rx_errors);
823 goto drop;
824 }
825
826 if (test_bit(IP_TUNNEL_SEQ_BIT, tunnel->parms.i_flags)) {
827 if (!test_bit(IP_TUNNEL_SEQ_BIT, tpi->flags) ||
828 (tunnel->i_seqno &&
829 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
830 DEV_STATS_INC(tunnel->dev, rx_fifo_errors);
831 DEV_STATS_INC(tunnel->dev, rx_errors);
832 goto drop;
833 }
834 tunnel->i_seqno = ntohl(tpi->seq) + 1;
835 }
836
837 skb->protocol = tpi->proto;
838
839 /* Warning: All skb pointers will be invalidated! */
840 if (tunnel->dev->type == ARPHRD_ETHER) {
841 if (!pskb_may_pull(skb, ETH_HLEN)) {
842 DEV_STATS_INC(tunnel->dev, rx_length_errors);
843 DEV_STATS_INC(tunnel->dev, rx_errors);
844 goto drop;
845 }
846
847 skb->protocol = eth_type_trans(skb, tunnel->dev);
848 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
849 } else {
850 skb->dev = tunnel->dev;
851 skb_reset_mac_header(skb);
852 }
853
854 /* Save offset of outer header relative to skb->head,
855 * because we are going to reset the network header to the inner header
856 * and might change skb->head.
857 */
858 nh = skb_network_header(skb) - skb->head;
859
860 skb_reset_network_header(skb);
861
862 if (skb_vlan_inet_prepare(skb, true)) {
863 DEV_STATS_INC(tunnel->dev, rx_length_errors);
864 DEV_STATS_INC(tunnel->dev, rx_errors);
865 goto drop;
866 }
867
868 /* Get the outer header. */
869 ipv6h = (struct ipv6hdr *)(skb->head + nh);
870
871 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
872
873 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
874
875 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
876 if (unlikely(err)) {
877 if (log_ecn_err)
878 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
879 &ipv6h->saddr,
880 ipv6_get_dsfield(ipv6h));
881 if (err > 1) {
882 DEV_STATS_INC(tunnel->dev, rx_frame_errors);
883 DEV_STATS_INC(tunnel->dev, rx_errors);
884 goto drop;
885 }
886 }
887
888 dev_sw_netstats_rx_add(tunnel->dev, skb->len);
889
890 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
891
892 if (tun_dst)
893 skb_dst_set(skb, (struct dst_entry *)tun_dst);
894
895 gro_cells_receive(&tunnel->gro_cells, skb);
896 return 0;
897
898drop:
899 if (tun_dst)
900 dst_release((struct dst_entry *)tun_dst);
901 kfree_skb(skb);
902 return 0;
903}
904
905int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
906 const struct tnl_ptk_info *tpi,
907 struct metadata_dst *tun_dst,
908 bool log_ecn_err)
909{
910 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
911 const struct ipv6hdr *ipv6h,
912 struct sk_buff *skb);
913
914 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
915 if (tpi->proto == htons(ETH_P_IP))
916 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
917
918 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
919 log_ecn_err);
920}
921EXPORT_SYMBOL(ip6_tnl_rcv);
922
923static const struct tnl_ptk_info tpi_v6 = {
924 /* no tunnel info required for ipxip6. */
925 .proto = htons(ETH_P_IPV6),
926};
927
928static const struct tnl_ptk_info tpi_v4 = {
929 /* no tunnel info required for ipxip6. */
930 .proto = htons(ETH_P_IP),
931};
932
933static const struct tnl_ptk_info tpi_mpls = {
934 /* no tunnel info required for mplsip6. */
935 .proto = htons(ETH_P_MPLS_UC),
936};
937
938static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
939 const struct tnl_ptk_info *tpi,
940 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
941 const struct ipv6hdr *ipv6h,
942 struct sk_buff *skb))
943{
944 struct ip6_tnl *t;
945 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
946 struct metadata_dst *tun_dst = NULL;
947 int ret = -1;
948
949 rcu_read_lock();
950 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
951
952 if (t) {
953 u8 tproto = READ_ONCE(t->parms.proto);
954
955 if (tproto != ipproto && tproto != 0)
956 goto drop;
957 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
958 goto drop;
959 ipv6h = ipv6_hdr(skb);
960 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
961 goto drop;
962 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
963 goto drop;
964 if (t->parms.collect_md) {
965 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
966
967 tun_dst = ipv6_tun_rx_dst(skb, flags, 0, 0);
968 if (!tun_dst)
969 goto drop;
970 }
971 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
972 log_ecn_error);
973 }
974
975 rcu_read_unlock();
976
977 return ret;
978
979drop:
980 rcu_read_unlock();
981 kfree_skb(skb);
982 return 0;
983}
984
985static int ip4ip6_rcv(struct sk_buff *skb)
986{
987 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
988 ip4ip6_dscp_ecn_decapsulate);
989}
990
991static int ip6ip6_rcv(struct sk_buff *skb)
992{
993 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
994 ip6ip6_dscp_ecn_decapsulate);
995}
996
997static int mplsip6_rcv(struct sk_buff *skb)
998{
999 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls,
1000 mplsip6_dscp_ecn_decapsulate);
1001}
1002
1003struct ipv6_tel_txoption {
1004 struct ipv6_txoptions ops;
1005 __u8 dst_opt[8];
1006};
1007
1008static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
1009{
1010 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
1011
1012 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
1013 opt->dst_opt[3] = 1;
1014 opt->dst_opt[4] = encap_limit;
1015 opt->dst_opt[5] = IPV6_TLV_PADN;
1016 opt->dst_opt[6] = 1;
1017
1018 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
1019 opt->ops.opt_nflen = 8;
1020}
1021
1022/**
1023 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
1024 * @t: the outgoing tunnel device
1025 * @hdr: IPv6 header from the incoming packet
1026 *
1027 * Description:
1028 * Avoid trivial tunneling loop by checking that tunnel exit-point
1029 * doesn't match source of incoming packet.
1030 *
1031 * Return:
1032 * 1 if conflict,
1033 * 0 else
1034 **/
1035
1036static inline bool
1037ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
1038{
1039 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
1040}
1041
1042int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1043 const struct in6_addr *laddr,
1044 const struct in6_addr *raddr)
1045{
1046 struct __ip6_tnl_parm *p = &t->parms;
1047 int ret = 0;
1048 struct net *net = t->net;
1049
1050 if (t->parms.collect_md)
1051 return 1;
1052
1053 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1054 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1055 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1056 struct net_device *ldev = NULL;
1057
1058 rcu_read_lock();
1059 if (p->link)
1060 ldev = dev_get_by_index_rcu(net, p->link);
1061
1062 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1063 0, IFA_F_TENTATIVE)))
1064 pr_warn_ratelimited("%s xmit: Local address not yet configured!\n",
1065 p->name);
1066 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1067 !ipv6_addr_is_multicast(raddr) &&
1068 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1069 true, 0, IFA_F_TENTATIVE)))
1070 pr_warn_ratelimited("%s xmit: Routing loop! Remote address found on this node!\n",
1071 p->name);
1072 else
1073 ret = 1;
1074 rcu_read_unlock();
1075 }
1076 return ret;
1077}
1078EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1079
1080/**
1081 * ip6_tnl_xmit - encapsulate packet and send
1082 * @skb: the outgoing socket buffer
1083 * @dev: the outgoing tunnel device
1084 * @dsfield: dscp code for outer header
1085 * @fl6: flow of tunneled packet
1086 * @encap_limit: encapsulation limit
1087 * @pmtu: Path MTU is stored if packet is too big
1088 * @proto: next header value
1089 *
1090 * Description:
1091 * Build new header and do some sanity checks on the packet before sending
1092 * it.
1093 *
1094 * Return:
1095 * 0 on success
1096 * -1 fail
1097 * %-EMSGSIZE message too big. return mtu in this case.
1098 **/
1099
1100int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1101 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1102 __u8 proto)
1103{
1104 struct ip6_tnl *t = netdev_priv(dev);
1105 struct net *net = t->net;
1106 struct ipv6hdr *ipv6h;
1107 struct ipv6_tel_txoption opt;
1108 struct dst_entry *dst = NULL, *ndst = NULL;
1109 struct net_device *tdev;
1110 int err_count, mtu;
1111 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1112 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1113 unsigned int max_headroom = psh_hlen;
1114 __be16 payload_protocol;
1115 bool use_cache = false;
1116 u8 hop_limit;
1117 int err = -1;
1118
1119 payload_protocol = skb_protocol(skb, true);
1120
1121 if (t->parms.collect_md) {
1122 hop_limit = skb_tunnel_info(skb)->key.ttl;
1123 goto route_lookup;
1124 } else {
1125 hop_limit = t->parms.hop_limit;
1126 }
1127
1128 /* NBMA tunnel */
1129 if (ipv6_addr_any(&t->parms.raddr)) {
1130 if (payload_protocol == htons(ETH_P_IPV6)) {
1131 struct in6_addr *addr6;
1132 struct neighbour *neigh;
1133 int addr_type;
1134
1135 if (!skb_dst(skb))
1136 goto tx_err_link_failure;
1137
1138 neigh = dst_neigh_lookup(skb_dst(skb),
1139 &ipv6_hdr(skb)->daddr);
1140 if (!neigh)
1141 goto tx_err_link_failure;
1142
1143 addr6 = (struct in6_addr *)&neigh->primary_key;
1144 addr_type = ipv6_addr_type(addr6);
1145
1146 if (addr_type == IPV6_ADDR_ANY)
1147 addr6 = &ipv6_hdr(skb)->daddr;
1148
1149 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1150 neigh_release(neigh);
1151 } else if (payload_protocol == htons(ETH_P_IP)) {
1152 const struct rtable *rt = skb_rtable(skb);
1153
1154 if (!rt)
1155 goto tx_err_link_failure;
1156
1157 if (rt->rt_gw_family == AF_INET6)
1158 memcpy(&fl6->daddr, &rt->rt_gw6, sizeof(fl6->daddr));
1159 }
1160 } else if (t->parms.proto != 0 && !(t->parms.flags &
1161 (IP6_TNL_F_USE_ORIG_TCLASS |
1162 IP6_TNL_F_USE_ORIG_FWMARK))) {
1163 /* enable the cache only if neither the outer protocol nor the
1164 * routing decision depends on the current inner header value
1165 */
1166 use_cache = true;
1167 }
1168
1169 if (use_cache)
1170 dst = dst_cache_get(&t->dst_cache);
1171
1172 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1173 goto tx_err_link_failure;
1174
1175 if (!dst) {
1176route_lookup:
1177 /* add dsfield to flowlabel for route lookup */
1178 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1179
1180 dst = ip6_route_output(net, NULL, fl6);
1181
1182 if (dst->error)
1183 goto tx_err_link_failure;
1184 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1185 if (IS_ERR(dst)) {
1186 err = PTR_ERR(dst);
1187 dst = NULL;
1188 goto tx_err_link_failure;
1189 }
1190 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1191 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1192 &fl6->daddr, 0, &fl6->saddr))
1193 goto tx_err_link_failure;
1194 ndst = dst;
1195 }
1196
1197 tdev = dst_dev(dst);
1198
1199 if (tdev == dev) {
1200 DEV_STATS_INC(dev, collisions);
1201 net_warn_ratelimited("%s: Local routing loop detected!\n",
1202 t->parms.name);
1203 goto tx_err_dst_release;
1204 }
1205 mtu = dst6_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1206 if (encap_limit >= 0) {
1207 max_headroom += 8;
1208 mtu -= 8;
1209 }
1210 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1211 IPV6_MIN_MTU : IPV4_MIN_MTU);
1212
1213 skb_dst_update_pmtu_no_confirm(skb, mtu);
1214 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1215 *pmtu = mtu;
1216 err = -EMSGSIZE;
1217 goto tx_err_dst_release;
1218 }
1219
1220 err_count = READ_ONCE(t->err_count);
1221 if (err_count > 0) {
1222 if (time_before(jiffies,
1223 READ_ONCE(t->err_time) + IP6TUNNEL_ERR_TIMEO)) {
1224 WRITE_ONCE(t->err_count, err_count - 1);
1225
1226 dst_link_failure(skb);
1227 } else {
1228 WRITE_ONCE(t->err_count, 0);
1229 }
1230 }
1231
1232 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1233
1234 /*
1235 * Okay, now see if we can stuff it in the buffer as-is.
1236 */
1237 max_headroom += LL_RESERVED_SPACE(tdev);
1238
1239 if (skb_cow_head(skb, max_headroom))
1240 goto tx_err_dst_release;
1241
1242 if (t->parms.collect_md) {
1243 if (t->encap.type != TUNNEL_ENCAP_NONE)
1244 goto tx_err_dst_release;
1245 } else {
1246 if (use_cache && ndst)
1247 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1248 }
1249 skb_dst_set(skb, dst);
1250
1251 if (hop_limit == 0) {
1252 if (payload_protocol == htons(ETH_P_IP))
1253 hop_limit = ip_hdr(skb)->ttl;
1254 else if (payload_protocol == htons(ETH_P_IPV6))
1255 hop_limit = ipv6_hdr(skb)->hop_limit;
1256 else
1257 hop_limit = ip6_dst_hoplimit(dst);
1258 }
1259
1260 /* Calculate max headroom for all the headers and adjust
1261 * needed_headroom if necessary.
1262 */
1263 max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct ipv6hdr)
1264 + dst->header_len + t->hlen;
1265 ip_tunnel_adj_headroom(dev, max_headroom);
1266
1267 err = ip6_tnl_encap(skb, t, &proto, fl6);
1268 if (err)
1269 return err;
1270
1271 if (encap_limit >= 0) {
1272 init_tel_txopt(&opt, encap_limit);
1273 proto = ipv6_push_frag_opts(skb, &opt.ops, proto);
1274 }
1275
1276 skb_push(skb, sizeof(struct ipv6hdr));
1277 skb_reset_network_header(skb);
1278 ipv6h = ipv6_hdr(skb);
1279 ip6_flow_hdr(ipv6h, dsfield,
1280 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1281 ipv6h->hop_limit = hop_limit;
1282 ipv6h->nexthdr = proto;
1283 ipv6h->saddr = fl6->saddr;
1284 ipv6h->daddr = fl6->daddr;
1285 ip6tunnel_xmit(NULL, skb, dev, 0);
1286 return 0;
1287tx_err_link_failure:
1288 DEV_STATS_INC(dev, tx_carrier_errors);
1289 dst_link_failure(skb);
1290tx_err_dst_release:
1291 dst_release(dst);
1292 return err;
1293}
1294EXPORT_SYMBOL(ip6_tnl_xmit);
1295
1296static inline int
1297ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev,
1298 u8 protocol)
1299{
1300 struct ip6_tnl *t = netdev_priv(dev);
1301 struct ipv6hdr *ipv6h;
1302 const struct iphdr *iph;
1303 int encap_limit = -1;
1304 __u16 offset;
1305 struct flowi6 fl6;
1306 __u8 dsfield, orig_dsfield;
1307 __u32 mtu;
1308 u8 tproto;
1309 int err;
1310
1311 tproto = READ_ONCE(t->parms.proto);
1312 if (tproto != protocol && tproto != 0)
1313 return -1;
1314
1315 if (t->parms.collect_md) {
1316 struct ip_tunnel_info *tun_info;
1317 const struct ip_tunnel_key *key;
1318
1319 tun_info = skb_tunnel_info(skb);
1320 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1321 ip_tunnel_info_af(tun_info) != AF_INET6))
1322 return -1;
1323 key = &tun_info->key;
1324 memset(&fl6, 0, sizeof(fl6));
1325 fl6.flowi6_proto = protocol;
1326 fl6.saddr = key->u.ipv6.src;
1327 fl6.daddr = key->u.ipv6.dst;
1328 fl6.flowlabel = key->label;
1329 dsfield = key->tos;
1330 switch (protocol) {
1331 case IPPROTO_IPIP:
1332 iph = ip_hdr(skb);
1333 orig_dsfield = ipv4_get_dsfield(iph);
1334 break;
1335 case IPPROTO_IPV6:
1336 ipv6h = ipv6_hdr(skb);
1337 orig_dsfield = ipv6_get_dsfield(ipv6h);
1338 break;
1339 default:
1340 orig_dsfield = dsfield;
1341 break;
1342 }
1343 } else {
1344 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1345 encap_limit = t->parms.encap_limit;
1346 if (protocol == IPPROTO_IPV6) {
1347 offset = ip6_tnl_parse_tlv_enc_lim(skb,
1348 skb_network_header(skb));
1349 /* ip6_tnl_parse_tlv_enc_lim() might have
1350 * reallocated skb->head
1351 */
1352 if (offset > 0) {
1353 struct ipv6_tlv_tnl_enc_lim *tel;
1354
1355 tel = (void *)&skb_network_header(skb)[offset];
1356 if (tel->encap_limit == 0) {
1357 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
1358 ICMPV6_HDR_FIELD, offset + 2);
1359 return -1;
1360 }
1361 encap_limit = tel->encap_limit - 1;
1362 }
1363 }
1364
1365 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1366 fl6.flowi6_proto = protocol;
1367
1368 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1369 fl6.flowi6_mark = skb->mark;
1370 else
1371 fl6.flowi6_mark = t->parms.fwmark;
1372 switch (protocol) {
1373 case IPPROTO_IPIP:
1374 iph = ip_hdr(skb);
1375 orig_dsfield = ipv4_get_dsfield(iph);
1376 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1377 dsfield = orig_dsfield;
1378 else
1379 dsfield = ip6_tclass(t->parms.flowinfo);
1380 break;
1381 case IPPROTO_IPV6:
1382 ipv6h = ipv6_hdr(skb);
1383 orig_dsfield = ipv6_get_dsfield(ipv6h);
1384 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1385 dsfield = orig_dsfield;
1386 else
1387 dsfield = ip6_tclass(t->parms.flowinfo);
1388 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1389 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1390 break;
1391 default:
1392 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo);
1393 break;
1394 }
1395 }
1396
1397 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1398 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield);
1399
1400 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1401 return -1;
1402
1403 skb_set_inner_ipproto(skb, protocol);
1404
1405 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1406 protocol);
1407 if (err != 0) {
1408 /* XXX: send ICMP error even if DF is not set. */
1409 if (err == -EMSGSIZE)
1410 switch (protocol) {
1411 case IPPROTO_IPIP:
1412 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1413 ICMP_FRAG_NEEDED, htonl(mtu));
1414 break;
1415 case IPPROTO_IPV6:
1416 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1417 break;
1418 default:
1419 break;
1420 }
1421 return -1;
1422 }
1423
1424 return 0;
1425}
1426
1427static netdev_tx_t
1428ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1429{
1430 struct ip6_tnl *t = netdev_priv(dev);
1431 u8 ipproto;
1432 int ret;
1433
1434 if (!pskb_inet_may_pull(skb))
1435 goto tx_err;
1436
1437 switch (skb->protocol) {
1438 case htons(ETH_P_IP):
1439 ipproto = IPPROTO_IPIP;
1440 break;
1441 case htons(ETH_P_IPV6):
1442 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb)))
1443 goto tx_err;
1444 ipproto = IPPROTO_IPV6;
1445 break;
1446 case htons(ETH_P_MPLS_UC):
1447 ipproto = IPPROTO_MPLS;
1448 break;
1449 default:
1450 goto tx_err;
1451 }
1452
1453 ret = ipxip6_tnl_xmit(skb, dev, ipproto);
1454 if (ret < 0)
1455 goto tx_err;
1456
1457 return NETDEV_TX_OK;
1458
1459tx_err:
1460 DEV_STATS_INC(dev, tx_errors);
1461 DEV_STATS_INC(dev, tx_dropped);
1462 kfree_skb(skb);
1463 return NETDEV_TX_OK;
1464}
1465
1466static void ip6_tnl_link_config(struct ip6_tnl *t)
1467{
1468 struct net_device *dev = t->dev;
1469 struct net_device *tdev = NULL;
1470 struct __ip6_tnl_parm *p = &t->parms;
1471 struct flowi6 *fl6 = &t->fl.u.ip6;
1472 int t_hlen;
1473 int mtu;
1474
1475 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1476 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1477
1478 /* Set up flowi template */
1479 fl6->saddr = p->laddr;
1480 fl6->daddr = p->raddr;
1481 fl6->flowi6_oif = p->link;
1482 fl6->flowlabel = 0;
1483
1484 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1485 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1486 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1487 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1488
1489 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1490 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1491
1492 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1493 dev->flags |= IFF_POINTOPOINT;
1494 else
1495 dev->flags &= ~IFF_POINTOPOINT;
1496
1497 t->tun_hlen = 0;
1498 t->hlen = t->encap_hlen + t->tun_hlen;
1499 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1500
1501 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1502 int strict = (ipv6_addr_type(&p->raddr) &
1503 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1504
1505 struct rt6_info *rt = rt6_lookup(t->net,
1506 &p->raddr, &p->laddr,
1507 p->link, NULL, strict);
1508 if (rt) {
1509 tdev = rt->dst.dev;
1510 ip6_rt_put(rt);
1511 }
1512
1513 if (!tdev && p->link)
1514 tdev = __dev_get_by_index(t->net, p->link);
1515
1516 if (tdev) {
1517 unsigned int headroom;
1518
1519 headroom = tdev->hard_header_len + tdev->needed_headroom;
1520 headroom += t_hlen;
1521 dev->needed_headroom = ip_tunnel_limit_headroom(headroom);
1522 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1523
1524 mtu = mtu - t_hlen;
1525 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1526 mtu -= 8;
1527
1528 if (mtu < IPV6_MIN_MTU)
1529 mtu = IPV6_MIN_MTU;
1530 WRITE_ONCE(dev->mtu, mtu);
1531 }
1532 }
1533}
1534
1535/**
1536 * ip6_tnl_change - update the tunnel parameters
1537 * @t: tunnel to be changed
1538 * @p: tunnel configuration parameters
1539 *
1540 * Description:
1541 * ip6_tnl_change() updates the tunnel parameters
1542 **/
1543
1544static void
1545ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1546{
1547 t->parms.laddr = p->laddr;
1548 t->parms.raddr = p->raddr;
1549 t->parms.flags = p->flags;
1550 t->parms.hop_limit = p->hop_limit;
1551 t->parms.encap_limit = p->encap_limit;
1552 t->parms.flowinfo = p->flowinfo;
1553 t->parms.link = p->link;
1554 t->parms.proto = p->proto;
1555 t->parms.fwmark = p->fwmark;
1556 dst_cache_reset(&t->dst_cache);
1557 ip6_tnl_link_config(t);
1558}
1559
1560static void ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1561{
1562 struct net *net = t->net;
1563 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1564
1565 ip6_tnl_unlink(ip6n, t);
1566 synchronize_net();
1567 ip6_tnl_change(t, p);
1568 ip6_tnl_link(ip6n, t);
1569 netdev_state_change(t->dev);
1570}
1571
1572static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
1573 bool strict)
1574{
1575 /* For the default ip6tnl0 device, allow changing only the protocol
1576 * (the IP6_TNL_F_CAP_PER_PACKET flag is set on ip6tnl0, and all other
1577 * parameters are 0).
1578 */
1579 if (strict &&
1580 (!ipv6_addr_any(&p->laddr) || !ipv6_addr_any(&p->raddr) ||
1581 p->flags != t->parms.flags || p->hop_limit || p->encap_limit ||
1582 p->flowinfo || p->link || p->fwmark || p->collect_md))
1583 return -EINVAL;
1584
1585 t->parms.proto = p->proto;
1586 netdev_state_change(t->dev);
1587 return 0;
1588}
1589
1590static void
1591ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1592{
1593 p->laddr = u->laddr;
1594 p->raddr = u->raddr;
1595 p->flags = u->flags;
1596 p->hop_limit = u->hop_limit;
1597 p->encap_limit = u->encap_limit;
1598 p->flowinfo = u->flowinfo;
1599 p->link = u->link;
1600 p->proto = u->proto;
1601 memcpy(p->name, u->name, sizeof(u->name));
1602}
1603
1604static void
1605ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1606{
1607 u->laddr = p->laddr;
1608 u->raddr = p->raddr;
1609 u->flags = p->flags;
1610 u->hop_limit = p->hop_limit;
1611 u->encap_limit = p->encap_limit;
1612 u->flowinfo = p->flowinfo;
1613 u->link = p->link;
1614 u->proto = p->proto;
1615 memcpy(u->name, p->name, sizeof(u->name));
1616}
1617
1618/**
1619 * ip6_tnl_siocdevprivate - configure ipv6 tunnels from userspace
1620 * @dev: virtual device associated with tunnel
1621 * @ifr: unused
1622 * @data: parameters passed from userspace
1623 * @cmd: command to be performed
1624 *
1625 * Description:
1626 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1627 * from userspace.
1628 *
1629 * The possible commands are the following:
1630 * %SIOCGETTUNNEL: get tunnel parameters for device
1631 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1632 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1633 * %SIOCDELTUNNEL: delete tunnel
1634 *
1635 * The fallback device "ip6tnl0", created during module
1636 * initialization, can be used for creating other tunnel devices.
1637 *
1638 * Return:
1639 * 0 on success,
1640 * %-EFAULT if unable to copy data to or from userspace,
1641 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1642 * %-EINVAL if passed tunnel parameters are invalid,
1643 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1644 * %-ENODEV if attempting to change or delete a nonexisting device
1645 **/
1646
1647static int
1648ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
1649 void __user *data, int cmd)
1650{
1651 int err = 0;
1652 struct ip6_tnl_parm p;
1653 struct __ip6_tnl_parm p1;
1654 struct ip6_tnl *t = netdev_priv(dev);
1655 struct net *net = t->net;
1656 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1657
1658 memset(&p1, 0, sizeof(p1));
1659
1660 switch (cmd) {
1661 case SIOCGETTUNNEL:
1662 if (dev == ip6n->fb_tnl_dev) {
1663 if (copy_from_user(&p, data, sizeof(p))) {
1664 err = -EFAULT;
1665 break;
1666 }
1667 ip6_tnl_parm_from_user(&p1, &p);
1668 t = ip6_tnl_locate(net, &p1, 0);
1669 if (IS_ERR(t))
1670 t = netdev_priv(dev);
1671 } else {
1672 memset(&p, 0, sizeof(p));
1673 }
1674 ip6_tnl_parm_to_user(&p, &t->parms);
1675 if (copy_to_user(data, &p, sizeof(p)))
1676 err = -EFAULT;
1677 break;
1678 case SIOCADDTUNNEL:
1679 case SIOCCHGTUNNEL:
1680 err = -EPERM;
1681 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1682 break;
1683 err = -EFAULT;
1684 if (copy_from_user(&p, data, sizeof(p)))
1685 break;
1686 err = -EINVAL;
1687 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1688 p.proto != 0)
1689 break;
1690 ip6_tnl_parm_from_user(&p1, &p);
1691 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1692 if (cmd == SIOCCHGTUNNEL) {
1693 if (!IS_ERR(t)) {
1694 if (t->dev != dev) {
1695 err = -EEXIST;
1696 break;
1697 }
1698 } else
1699 t = netdev_priv(dev);
1700 if (dev == ip6n->fb_tnl_dev)
1701 ip6_tnl0_update(t, &p1, false);
1702 else
1703 ip6_tnl_update(t, &p1);
1704 }
1705 if (!IS_ERR(t)) {
1706 err = 0;
1707 ip6_tnl_parm_to_user(&p, &t->parms);
1708 if (copy_to_user(data, &p, sizeof(p)))
1709 err = -EFAULT;
1710
1711 } else {
1712 err = PTR_ERR(t);
1713 }
1714 break;
1715 case SIOCDELTUNNEL:
1716 err = -EPERM;
1717 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1718 break;
1719
1720 if (dev == ip6n->fb_tnl_dev) {
1721 err = -EFAULT;
1722 if (copy_from_user(&p, data, sizeof(p)))
1723 break;
1724 err = -ENOENT;
1725 ip6_tnl_parm_from_user(&p1, &p);
1726 t = ip6_tnl_locate(net, &p1, 0);
1727 if (IS_ERR(t))
1728 break;
1729 err = -EPERM;
1730 if (t->dev == ip6n->fb_tnl_dev)
1731 break;
1732 dev = t->dev;
1733 }
1734 err = 0;
1735 unregister_netdevice(dev);
1736 break;
1737 default:
1738 err = -EINVAL;
1739 }
1740 return err;
1741}
1742
1743/**
1744 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1745 * @dev: virtual device associated with tunnel
1746 * @new_mtu: the new mtu
1747 *
1748 * Return:
1749 * 0 on success,
1750 * %-EINVAL if mtu too small
1751 **/
1752
1753int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1754{
1755 struct ip6_tnl *tnl = netdev_priv(dev);
1756 int t_hlen;
1757
1758 t_hlen = tnl->hlen + sizeof(struct ipv6hdr);
1759 if (tnl->parms.proto == IPPROTO_IPV6) {
1760 if (new_mtu < IPV6_MIN_MTU)
1761 return -EINVAL;
1762 } else {
1763 if (new_mtu < ETH_MIN_MTU)
1764 return -EINVAL;
1765 }
1766 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1767 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len - t_hlen)
1768 return -EINVAL;
1769 } else {
1770 if (new_mtu > IP_MAX_MTU - dev->hard_header_len - t_hlen)
1771 return -EINVAL;
1772 }
1773 WRITE_ONCE(dev->mtu, new_mtu);
1774 return 0;
1775}
1776EXPORT_SYMBOL(ip6_tnl_change_mtu);
1777
1778int ip6_tnl_get_iflink(const struct net_device *dev)
1779{
1780 struct ip6_tnl *t = netdev_priv(dev);
1781
1782 return READ_ONCE(t->parms.link);
1783}
1784EXPORT_SYMBOL(ip6_tnl_get_iflink);
1785
1786int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1787 unsigned int num)
1788{
1789 if (num >= MAX_IPTUN_ENCAP_OPS)
1790 return -ERANGE;
1791
1792 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1793 &ip6tun_encaps[num],
1794 NULL, ops) ? 0 : -1;
1795}
1796EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1797
1798int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1799 unsigned int num)
1800{
1801 int ret;
1802
1803 if (num >= MAX_IPTUN_ENCAP_OPS)
1804 return -ERANGE;
1805
1806 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1807 &ip6tun_encaps[num],
1808 ops, NULL) == ops) ? 0 : -1;
1809
1810 synchronize_net();
1811
1812 return ret;
1813}
1814EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1815
1816int ip6_tnl_encap_setup(struct ip6_tnl *t,
1817 struct ip_tunnel_encap *ipencap)
1818{
1819 int hlen;
1820
1821 memset(&t->encap, 0, sizeof(t->encap));
1822
1823 hlen = ip6_encap_hlen(ipencap);
1824 if (hlen < 0)
1825 return hlen;
1826
1827 t->encap.type = ipencap->type;
1828 t->encap.sport = ipencap->sport;
1829 t->encap.dport = ipencap->dport;
1830 t->encap.flags = ipencap->flags;
1831
1832 t->encap_hlen = hlen;
1833 t->hlen = t->encap_hlen + t->tun_hlen;
1834
1835 return 0;
1836}
1837EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1838
1839static int ip6_tnl_fill_forward_path(struct net_device_path_ctx *ctx,
1840 struct net_device_path *path)
1841{
1842 struct ip6_tnl *t = netdev_priv(ctx->dev);
1843 struct dst_entry *dst;
1844 struct flowi6 fl6;
1845 int err;
1846
1847 if (ctx->ether_type != cpu_to_be16(ETH_P_IPV6))
1848 return -EOPNOTSUPP;
1849
1850 if (t->parms.flags & (IP6_TNL_F_USE_ORIG_TCLASS |
1851 IP6_TNL_F_USE_ORIG_FLOWLABEL |
1852 IP6_TNL_F_USE_ORIG_FWMARK))
1853 return -EOPNOTSUPP;
1854
1855 if (t->parms.collect_md)
1856 return -EOPNOTSUPP;
1857
1858 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1859 return -EOPNOTSUPP;
1860
1861 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1862 fl6.flowi6_mark = t->parms.fwmark;
1863 fl6.flowi6_proto = 0;
1864
1865 dst = ip6_route_output(dev_net(ctx->dev), NULL, &fl6);
1866 if (!dst->error) {
1867 path->type = DEV_PATH_TUN;
1868 path->tun.src_v6 = fl6.saddr;
1869 path->tun.dst_v6 = fl6.daddr;
1870 path->tun.inner_proto = IPPROTO_IPV6;
1871 path->tun.dst = dst;
1872 path->dev = ctx->dev;
1873 ctx->dev = dst->dev;
1874 }
1875
1876 err = dst->error;
1877 if (err)
1878 dst_release(dst);
1879
1880 return err;
1881}
1882
1883static const struct net_device_ops ip6_tnl_netdev_ops = {
1884 .ndo_init = ip6_tnl_dev_init,
1885 .ndo_uninit = ip6_tnl_dev_uninit,
1886 .ndo_start_xmit = ip6_tnl_start_xmit,
1887 .ndo_siocdevprivate = ip6_tnl_siocdevprivate,
1888 .ndo_change_mtu = ip6_tnl_change_mtu,
1889 .ndo_get_stats64 = dev_get_tstats64,
1890 .ndo_get_iflink = ip6_tnl_get_iflink,
1891 .ndo_fill_forward_path = ip6_tnl_fill_forward_path,
1892};
1893
1894#define IPXIPX_FEATURES (NETIF_F_SG | \
1895 NETIF_F_FRAGLIST | \
1896 NETIF_F_HIGHDMA | \
1897 NETIF_F_GSO_SOFTWARE | \
1898 NETIF_F_HW_CSUM)
1899
1900/**
1901 * ip6_tnl_dev_setup - setup virtual tunnel device
1902 * @dev: virtual device associated with tunnel
1903 *
1904 * Description:
1905 * Initialize function pointers and device parameters
1906 **/
1907
1908static void ip6_tnl_dev_setup(struct net_device *dev)
1909{
1910 dev->netdev_ops = &ip6_tnl_netdev_ops;
1911 dev->header_ops = &ip_tunnel_header_ops;
1912 dev->needs_free_netdev = true;
1913 dev->priv_destructor = ip6_dev_free;
1914
1915 dev->type = ARPHRD_TUNNEL6;
1916 dev->flags |= IFF_NOARP;
1917 dev->addr_len = sizeof(struct in6_addr);
1918 dev->lltx = true;
1919 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1920 netif_keep_dst(dev);
1921
1922 dev->features |= IPXIPX_FEATURES;
1923 dev->hw_features |= IPXIPX_FEATURES;
1924
1925 /* This perm addr will be used as interface identifier by IPv6 */
1926 dev->addr_assign_type = NET_ADDR_RANDOM;
1927 eth_random_addr(dev->perm_addr);
1928}
1929
1930
1931/**
1932 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1933 * @dev: virtual device associated with tunnel
1934 **/
1935
1936static inline int
1937ip6_tnl_dev_init_gen(struct net_device *dev)
1938{
1939 struct ip6_tnl *t = netdev_priv(dev);
1940 int ret;
1941 int t_hlen;
1942
1943 t->dev = dev;
1944
1945 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1946 if (ret)
1947 return ret;
1948
1949 ret = gro_cells_init(&t->gro_cells, dev);
1950 if (ret)
1951 goto destroy_dst;
1952
1953 t->tun_hlen = 0;
1954 t->hlen = t->encap_hlen + t->tun_hlen;
1955 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1956
1957 dev->type = ARPHRD_TUNNEL6;
1958 dev->mtu = ETH_DATA_LEN - t_hlen;
1959 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1960 dev->mtu -= 8;
1961 dev->min_mtu = ETH_MIN_MTU;
1962 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len - t_hlen;
1963
1964 netdev_hold(dev, &t->dev_tracker, GFP_KERNEL);
1965 netdev_lockdep_set_classes(dev);
1966 return 0;
1967
1968destroy_dst:
1969 dst_cache_destroy(&t->dst_cache);
1970
1971 return ret;
1972}
1973
1974/**
1975 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1976 * @dev: virtual device associated with tunnel
1977 **/
1978
1979static int ip6_tnl_dev_init(struct net_device *dev)
1980{
1981 struct ip6_tnl *t = netdev_priv(dev);
1982 int err = ip6_tnl_dev_init_gen(dev);
1983
1984 if (err)
1985 return err;
1986 ip6_tnl_link_config(t);
1987 if (t->parms.collect_md)
1988 netif_keep_dst(dev);
1989 return 0;
1990}
1991
1992/**
1993 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1994 * @dev: fallback device
1995 *
1996 * Return: 0
1997 **/
1998
1999static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
2000{
2001 struct ip6_tnl *t = netdev_priv(dev);
2002 struct net *net = dev_net(dev);
2003 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2004
2005 t->net = net;
2006 t->parms.proto = IPPROTO_IPV6;
2007
2008 rcu_assign_pointer(ip6n->tnls_wc[0], t);
2009 return 0;
2010}
2011
2012static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
2013 struct netlink_ext_ack *extack)
2014{
2015 u8 proto;
2016
2017 if (!data || !data[IFLA_IPTUN_PROTO])
2018 return 0;
2019
2020 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2021 if (proto != IPPROTO_IPV6 &&
2022 proto != IPPROTO_IPIP &&
2023 proto != 0)
2024 return -EINVAL;
2025
2026 return 0;
2027}
2028
2029static void ip6_tnl_netlink_parms(struct nlattr *data[],
2030 struct __ip6_tnl_parm *parms)
2031{
2032 memset(parms, 0, sizeof(*parms));
2033
2034 if (!data)
2035 return;
2036
2037 if (data[IFLA_IPTUN_LINK])
2038 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
2039
2040 if (data[IFLA_IPTUN_LOCAL])
2041 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
2042
2043 if (data[IFLA_IPTUN_REMOTE])
2044 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
2045
2046 if (data[IFLA_IPTUN_TTL])
2047 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
2048
2049 if (data[IFLA_IPTUN_ENCAP_LIMIT])
2050 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
2051
2052 if (data[IFLA_IPTUN_FLOWINFO])
2053 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
2054
2055 if (data[IFLA_IPTUN_FLAGS])
2056 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
2057
2058 if (data[IFLA_IPTUN_PROTO])
2059 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
2060
2061 if (data[IFLA_IPTUN_COLLECT_METADATA])
2062 parms->collect_md = true;
2063
2064 if (data[IFLA_IPTUN_FWMARK])
2065 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
2066}
2067
2068static int ip6_tnl_newlink(struct net_device *dev,
2069 struct rtnl_newlink_params *params,
2070 struct netlink_ext_ack *extack)
2071{
2072 struct nlattr **data = params->data;
2073 struct nlattr **tb = params->tb;
2074 struct ip_tunnel_encap ipencap;
2075 struct ip6_tnl_net *ip6n;
2076 struct ip6_tnl *nt, *t;
2077 struct net *net;
2078 int err;
2079
2080 net = params->link_net ? : dev_net(dev);
2081 ip6n = net_generic(net, ip6_tnl_net_id);
2082 nt = netdev_priv(dev);
2083 nt->net = net;
2084
2085 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2086 err = ip6_tnl_encap_setup(nt, &ipencap);
2087 if (err < 0)
2088 return err;
2089 }
2090
2091 ip6_tnl_netlink_parms(data, &nt->parms);
2092
2093 if (nt->parms.collect_md) {
2094 if (rtnl_dereference(ip6n->collect_md_tun))
2095 return -EEXIST;
2096 } else {
2097 t = ip6_tnl_locate(net, &nt->parms, 0);
2098 if (!IS_ERR(t))
2099 return -EEXIST;
2100 }
2101
2102 err = ip6_tnl_create2(dev);
2103 if (!err && tb[IFLA_MTU])
2104 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2105
2106 return err;
2107}
2108
2109static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2110 struct nlattr *data[],
2111 struct netlink_ext_ack *extack)
2112{
2113 struct ip6_tnl *t = netdev_priv(dev);
2114 struct __ip6_tnl_parm p;
2115 struct net *net = t->net;
2116 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2117 struct ip_tunnel_encap ipencap;
2118
2119 if (!rtnl_dev_link_net_capable(dev, net))
2120 return -EPERM;
2121
2122 if (dev == ip6n->fb_tnl_dev) {
2123 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2124 /* iproute2 always sets TUNNEL_ENCAP_FLAG_CSUM6, so
2125 * let's ignore this flag.
2126 */
2127 ipencap.flags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
2128 if (memchr_inv(&ipencap, 0, sizeof(ipencap))) {
2129 NL_SET_ERR_MSG(extack,
2130 "Only protocol can be changed for fallback tunnel, not encap params");
2131 return -EINVAL;
2132 }
2133 }
2134
2135 ip6_tnl_netlink_parms(data, &p);
2136 if (ip6_tnl0_update(t, &p, true) < 0) {
2137 NL_SET_ERR_MSG(extack,
2138 "Only protocol can be changed for fallback tunnel");
2139 return -EINVAL;
2140 }
2141
2142 return 0;
2143 }
2144
2145 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
2146 int err = ip6_tnl_encap_setup(t, &ipencap);
2147
2148 if (err < 0)
2149 return err;
2150 }
2151 ip6_tnl_netlink_parms(data, &p);
2152 if (p.collect_md)
2153 return -EINVAL;
2154
2155 t = ip6_tnl_locate(net, &p, 0);
2156 if (!IS_ERR(t)) {
2157 if (t->dev != dev)
2158 return -EEXIST;
2159 } else
2160 t = netdev_priv(dev);
2161
2162 ip6_tnl_update(t, &p);
2163 return 0;
2164}
2165
2166static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2167{
2168 struct net *net = dev_net(dev);
2169 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2170
2171 if (dev != ip6n->fb_tnl_dev)
2172 unregister_netdevice_queue(dev, head);
2173}
2174
2175static size_t ip6_tnl_get_size(const struct net_device *dev)
2176{
2177 return
2178 /* IFLA_IPTUN_LINK */
2179 nla_total_size(4) +
2180 /* IFLA_IPTUN_LOCAL */
2181 nla_total_size(sizeof(struct in6_addr)) +
2182 /* IFLA_IPTUN_REMOTE */
2183 nla_total_size(sizeof(struct in6_addr)) +
2184 /* IFLA_IPTUN_TTL */
2185 nla_total_size(1) +
2186 /* IFLA_IPTUN_ENCAP_LIMIT */
2187 nla_total_size(1) +
2188 /* IFLA_IPTUN_FLOWINFO */
2189 nla_total_size(4) +
2190 /* IFLA_IPTUN_FLAGS */
2191 nla_total_size(4) +
2192 /* IFLA_IPTUN_PROTO */
2193 nla_total_size(1) +
2194 /* IFLA_IPTUN_ENCAP_TYPE */
2195 nla_total_size(2) +
2196 /* IFLA_IPTUN_ENCAP_FLAGS */
2197 nla_total_size(2) +
2198 /* IFLA_IPTUN_ENCAP_SPORT */
2199 nla_total_size(2) +
2200 /* IFLA_IPTUN_ENCAP_DPORT */
2201 nla_total_size(2) +
2202 /* IFLA_IPTUN_COLLECT_METADATA */
2203 nla_total_size(0) +
2204 /* IFLA_IPTUN_FWMARK */
2205 nla_total_size(4) +
2206 0;
2207}
2208
2209static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2210{
2211 struct ip6_tnl *tunnel = netdev_priv(dev);
2212 struct __ip6_tnl_parm *parm = &tunnel->parms;
2213
2214 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2215 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2216 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2217 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2218 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2219 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2220 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2221 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2222 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2223 goto nla_put_failure;
2224
2225 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2226 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2227 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2228 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2229 goto nla_put_failure;
2230
2231 if (parm->collect_md)
2232 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2233 goto nla_put_failure;
2234
2235 return 0;
2236
2237nla_put_failure:
2238 return -EMSGSIZE;
2239}
2240
2241struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2242{
2243 struct ip6_tnl *tunnel = netdev_priv(dev);
2244
2245 return READ_ONCE(tunnel->net);
2246}
2247EXPORT_SYMBOL(ip6_tnl_get_link_net);
2248
2249static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2250 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2251 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2252 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2253 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2254 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2255 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2256 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2257 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2258 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2259 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2260 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2261 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2262 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2263 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2264};
2265
2266static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2267 .kind = "ip6tnl",
2268 .maxtype = IFLA_IPTUN_MAX,
2269 .policy = ip6_tnl_policy,
2270 .priv_size = sizeof(struct ip6_tnl),
2271 .setup = ip6_tnl_dev_setup,
2272 .validate = ip6_tnl_validate,
2273 .newlink = ip6_tnl_newlink,
2274 .changelink = ip6_tnl_changelink,
2275 .dellink = ip6_tnl_dellink,
2276 .get_size = ip6_tnl_get_size,
2277 .fill_info = ip6_tnl_fill_info,
2278 .get_link_net = ip6_tnl_get_link_net,
2279};
2280
2281static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2282 .handler = ip4ip6_rcv,
2283 .err_handler = ip4ip6_err,
2284 .priority = 1,
2285};
2286
2287static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2288 .handler = ip6ip6_rcv,
2289 .err_handler = ip6ip6_err,
2290 .priority = 1,
2291};
2292
2293static struct xfrm6_tunnel mplsip6_handler __read_mostly = {
2294 .handler = mplsip6_rcv,
2295 .err_handler = mplsip6_err,
2296 .priority = 1,
2297};
2298
2299static void __net_exit ip6_tnl_exit_rtnl_net(struct net *net, struct list_head *list)
2300{
2301 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2302 struct net_device *dev, *aux;
2303 int h;
2304 struct ip6_tnl *t;
2305
2306 for_each_netdev_safe(net, dev, aux)
2307 if (dev->rtnl_link_ops == &ip6_link_ops)
2308 unregister_netdevice_queue(dev, list);
2309
2310 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2311 t = rtnl_net_dereference(net, ip6n->tnls_r_l[h]);
2312 while (t) {
2313 /* If dev is in the same netns, it has already
2314 * been added to the list by the previous loop.
2315 */
2316 if (!net_eq(dev_net(t->dev), net))
2317 unregister_netdevice_queue(t->dev, list);
2318
2319 t = rtnl_net_dereference(net, t->next);
2320 }
2321 }
2322
2323 t = rtnl_net_dereference(net, ip6n->tnls_wc[0]);
2324 while (t) {
2325 /* If dev is in the same netns, it has already
2326 * been added to the list by the previous loop.
2327 */
2328 if (!net_eq(dev_net(t->dev), net))
2329 unregister_netdevice_queue(t->dev, list);
2330
2331 t = rtnl_net_dereference(net, t->next);
2332 }
2333}
2334
2335static int __net_init ip6_tnl_init_net(struct net *net)
2336{
2337 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2338 struct ip6_tnl *t = NULL;
2339 int err;
2340
2341 ip6n->tnls[0] = ip6n->tnls_wc;
2342 ip6n->tnls[1] = ip6n->tnls_r_l;
2343
2344 if (!net_has_fallback_tunnels(net))
2345 return 0;
2346 err = -ENOMEM;
2347 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2348 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2349
2350 if (!ip6n->fb_tnl_dev)
2351 goto err_alloc_dev;
2352 dev_net_set(ip6n->fb_tnl_dev, net);
2353 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2354 /* FB netdevice is special: we have one, and only one per netns.
2355 * Allowing to move it to another netns is clearly unsafe.
2356 */
2357 ip6n->fb_tnl_dev->netns_immutable = true;
2358
2359 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2360 if (err < 0)
2361 goto err_register;
2362
2363 err = register_netdev(ip6n->fb_tnl_dev);
2364 if (err < 0)
2365 goto err_register;
2366
2367 t = netdev_priv(ip6n->fb_tnl_dev);
2368
2369 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2370 return 0;
2371
2372err_register:
2373 free_netdev(ip6n->fb_tnl_dev);
2374err_alloc_dev:
2375 return err;
2376}
2377
2378static struct pernet_operations ip6_tnl_net_ops = {
2379 .init = ip6_tnl_init_net,
2380 .exit_rtnl = ip6_tnl_exit_rtnl_net,
2381 .id = &ip6_tnl_net_id,
2382 .size = sizeof(struct ip6_tnl_net),
2383};
2384
2385/**
2386 * ip6_tunnel_init - register protocol and reserve needed resources
2387 *
2388 * Return: 0 on success
2389 **/
2390
2391static int __init ip6_tunnel_init(void)
2392{
2393 int err;
2394
2395 if (!ipv6_mod_enabled())
2396 return -EOPNOTSUPP;
2397
2398 err = register_pernet_device(&ip6_tnl_net_ops);
2399 if (err < 0)
2400 goto out_pernet;
2401
2402 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2403 if (err < 0) {
2404 pr_err("%s: can't register ip4ip6\n", __func__);
2405 goto out_ip4ip6;
2406 }
2407
2408 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2409 if (err < 0) {
2410 pr_err("%s: can't register ip6ip6\n", __func__);
2411 goto out_ip6ip6;
2412 }
2413
2414 if (ip6_tnl_mpls_supported()) {
2415 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS);
2416 if (err < 0) {
2417 pr_err("%s: can't register mplsip6\n", __func__);
2418 goto out_mplsip6;
2419 }
2420 }
2421
2422 err = rtnl_link_register(&ip6_link_ops);
2423 if (err < 0)
2424 goto rtnl_link_failed;
2425
2426 return 0;
2427
2428rtnl_link_failed:
2429 if (ip6_tnl_mpls_supported())
2430 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS);
2431out_mplsip6:
2432 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2433out_ip6ip6:
2434 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2435out_ip4ip6:
2436 unregister_pernet_device(&ip6_tnl_net_ops);
2437out_pernet:
2438 return err;
2439}
2440
2441/**
2442 * ip6_tunnel_cleanup - free resources and unregister protocol
2443 **/
2444
2445static void __exit ip6_tunnel_cleanup(void)
2446{
2447 rtnl_link_unregister(&ip6_link_ops);
2448 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2449 pr_info("%s: can't deregister ip4ip6\n", __func__);
2450
2451 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2452 pr_info("%s: can't deregister ip6ip6\n", __func__);
2453
2454 if (ip6_tnl_mpls_supported() &&
2455 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS))
2456 pr_info("%s: can't deregister mplsip6\n", __func__);
2457 unregister_pernet_device(&ip6_tnl_net_ops);
2458}
2459
2460module_init(ip6_tunnel_init);
2461module_exit(ip6_tunnel_cleanup);