?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blobdb84f523656ddf876e1971c416ee03a6a1794d9d
1 /*
2 * IPv6 tunneling device
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Ville Nuorvala <vnuorval@tcs.hut.fi>
7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
8 *
9 * Based on:
10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
11 *
12 * RFC 2473
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/errno.h>
26 #include <linux/types.h>
27 #include <linux/sockios.h>
28 #include <linux/icmp.h>
29 #include <linux/if.h>
30 #include <linux/in.h>
31 #include <linux/ip.h>
32 #include <linux/net.h>
33 #include <linux/in6.h>
34 #include <linux/netdevice.h>
35 #include <linux/if_arp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/init.h>
38 #include <linux/route.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/netfilter_ipv6.h>
41 #include <linux/slab.h>
42 #include <linux/hash.h>
43 #include <linux/etherdevice.h>
44
45 #include <linux/uaccess.h>
46 #include <linux/atomic.h>
47
48 #include <net/icmp.h>
49 #include <net/ip.h>
50 #include <net/ip_tunnels.h>
51 #include <net/ipv6.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_tunnel.h>
55 #include <net/xfrm.h>
56 #include <net/dsfield.h>
57 #include <net/inet_ecn.h>
58 #include <net/net_namespace.h>
59 #include <net/netns/generic.h>
60 #include <net/dst_metadata.h>
61
62 MODULE_AUTHOR("Ville Nuorvala");
63 MODULE_DESCRIPTION("IPv6 tunneling device");
64 MODULE_LICENSE("GPL");
65 MODULE_ALIAS_RTNL_LINK("ip6tnl");
66 MODULE_ALIAS_NETDEV("ip6tnl0");
67
68 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
69 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
70
71 static bool log_ecn_error = true;
72 module_param(log_ecn_error, bool, 0644);
73 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
74
75 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
76 {
77 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
78
79 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
80 }
81
82 static int ip6_tnl_dev_init(struct net_device *dev);
83 static void ip6_tnl_dev_setup(struct net_device *dev);
84 static struct rtnl_link_ops ip6_link_ops __read_mostly;
85
86 static unsigned int ip6_tnl_net_id __read_mostly;
87 struct ip6_tnl_net {
88 /* the IPv6 tunnel fallback device */
89 struct net_device *fb_tnl_dev;
90 /* lists for storing tunnels in use */
91 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
92 struct ip6_tnl __rcu *tnls_wc[1];
93 struct ip6_tnl __rcu **tnls[2];
94 struct ip6_tnl __rcu *collect_md_tun;
95 };
96
97 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
98 {
99 struct pcpu_sw_netstats tmp, sum = { 0 };
100 int i;
101
102 for_each_possible_cpu(i) {
103 unsigned int start;
104 const struct pcpu_sw_netstats *tstats =
105 per_cpu_ptr(dev->tstats, i);
106
107 do {
108 start = u64_stats_fetch_begin_irq(&tstats->syncp);
109 tmp.rx_packets = tstats->rx_packets;
110 tmp.rx_bytes = tstats->rx_bytes;
111 tmp.tx_packets = tstats->tx_packets;
112 tmp.tx_bytes = tstats->tx_bytes;
113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
114
115 sum.rx_packets += tmp.rx_packets;
116 sum.rx_bytes += tmp.rx_bytes;
117 sum.tx_packets += tmp.tx_packets;
118 sum.tx_bytes += tmp.tx_bytes;
119 }
120 dev->stats.rx_packets = sum.rx_packets;
121 dev->stats.rx_bytes = sum.rx_bytes;
122 dev->stats.tx_packets = sum.tx_packets;
123 dev->stats.tx_bytes = sum.tx_bytes;
124 return &dev->stats;
125 }
126
127 /**
128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
129 * @remote: the address of the tunnel exit-point
130 * @local: the address of the tunnel entry-point
131 *
132 * Return:
133 * tunnel matching given end-points if found,
134 * else fallback tunnel if its device is up,
135 * else %NULL
136 **/
137
138 #define for_each_ip6_tunnel_rcu(start) \
139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
140
141 static struct ip6_tnl *
142 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
143 {
144 unsigned int hash = HASH(remote, local);
145 struct ip6_tnl *t;
146 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
147 struct in6_addr any;
148
149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
150 if (ipv6_addr_equal(local, &t->parms.laddr) &&
151 ipv6_addr_equal(remote, &t->parms.raddr) &&
152 (t->dev->flags & IFF_UP))
153 return t;
154 }
155
156 memset(&any, 0, sizeof(any));
157 hash = HASH(&any, local);
158 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
159 if (ipv6_addr_equal(local, &t->parms.laddr) &&
160 ipv6_addr_any(&t->parms.raddr) &&
161 (t->dev->flags & IFF_UP))
162 return t;
163 }
164
165 hash = HASH(remote, &any);
166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
167 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
168 ipv6_addr_any(&t->parms.laddr) &&
169 (t->dev->flags & IFF_UP))
170 return t;
171 }
172
173 t = rcu_dereference(ip6n->collect_md_tun);
174 if (t && t->dev->flags & IFF_UP)
175 return t;
176
177 t = rcu_dereference(ip6n->tnls_wc[0]);
178 if (t && (t->dev->flags & IFF_UP))
179 return t;
180
181 return NULL;
182 }
183
184 /**
185 * ip6_tnl_bucket - get head of list matching given tunnel parameters
186 * @p: parameters containing tunnel end-points
187 *
188 * Description:
189 * ip6_tnl_bucket() returns the head of the list matching the
190 * &struct in6_addr entries laddr and raddr in @p.
191 *
192 * Return: head of IPv6 tunnel list
193 **/
194
195 static struct ip6_tnl __rcu **
196 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
197 {
198 const struct in6_addr *remote = &p->raddr;
199 const struct in6_addr *local = &p->laddr;
200 unsigned int h = 0;
201 int prio = 0;
202
203 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
204 prio = 1;
205 h = HASH(remote, local);
206 }
207 return &ip6n->tnls[prio][h];
208 }
209
210 /**
211 * ip6_tnl_link - add tunnel to hash table
212 * @t: tunnel to be added
213 **/
214
215 static void
216 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
217 {
218 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
219
220 if (t->parms.collect_md)
221 rcu_assign_pointer(ip6n->collect_md_tun, t);
222 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
223 rcu_assign_pointer(*tp, t);
224 }
225
226 /**
227 * ip6_tnl_unlink - remove tunnel from hash table
228 * @t: tunnel to be removed
229 **/
230
231 static void
232 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
233 {
234 struct ip6_tnl __rcu **tp;
235 struct ip6_tnl *iter;
236
237 if (t->parms.collect_md)
238 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
239
240 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
241 (iter = rtnl_dereference(*tp)) != NULL;
242 tp = &iter->next) {
243 if (t == iter) {
244 rcu_assign_pointer(*tp, t->next);
245 break;
246 }
247 }
248 }
249
250 static void ip6_dev_free(struct net_device *dev)
251 {
252 struct ip6_tnl *t = netdev_priv(dev);
253
254 gro_cells_destroy(&t->gro_cells);
255 dst_cache_destroy(&t->dst_cache);
256 free_percpu(dev->tstats);
257 }
258
259 static int ip6_tnl_create2(struct net_device *dev)
260 {
261 struct ip6_tnl *t = netdev_priv(dev);
262 struct net *net = dev_net(dev);
263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
264 int err;
265
266 t = netdev_priv(dev);
267
268 dev->rtnl_link_ops = &ip6_link_ops;
269 err = register_netdevice(dev);
270 if (err < 0)
271 goto out;
272
273 strcpy(t->parms.name, dev->name);
274
275 dev_hold(dev);
276 ip6_tnl_link(ip6n, t);
277 return 0;
278
279 out:
280 return err;
281 }
282
283 /**
284 * ip6_tnl_create - create a new tunnel
285 * @p: tunnel parameters
286 * @pt: pointer to new tunnel
287 *
288 * Description:
289 * Create tunnel matching given parameters.
290 *
291 * Return:
292 * created tunnel or error pointer
293 **/
294
295 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
296 {
297 struct net_device *dev;
298 struct ip6_tnl *t;
299 char name[IFNAMSIZ];
300 int err = -ENOMEM;
301
302 if (p->name[0])
303 strlcpy(name, p->name, IFNAMSIZ);
304 else
305 sprintf(name, "ip6tnl%%d");
306
307 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
308 ip6_tnl_dev_setup);
309 if (!dev)
310 goto failed;
311
312 dev_net_set(dev, net);
313
314 t = netdev_priv(dev);
315 t->parms = *p;
316 t->net = dev_net(dev);
317 err = ip6_tnl_create2(dev);
318 if (err < 0)
319 goto failed_free;
320
321 return t;
322
323 failed_free:
324 free_netdev(dev);
325 failed:
326 return ERR_PTR(err);
327 }
328
329 /**
330 * ip6_tnl_locate - find or create tunnel matching given parameters
331 * @p: tunnel parameters
332 * @create: != 0 if allowed to create new tunnel if no match found
333 *
334 * Description:
335 * ip6_tnl_locate() first tries to locate an existing tunnel
336 * based on @parms. If this is unsuccessful, but @create is set a new
337 * tunnel device is created and registered for use.
338 *
339 * Return:
340 * matching tunnel or error pointer
341 **/
342
343 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
344 struct __ip6_tnl_parm *p, int create)
345 {
346 const struct in6_addr *remote = &p->raddr;
347 const struct in6_addr *local = &p->laddr;
348 struct ip6_tnl __rcu **tp;
349 struct ip6_tnl *t;
350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
351
352 for (tp = ip6_tnl_bucket(ip6n, p);
353 (t = rtnl_dereference(*tp)) != NULL;
354 tp = &t->next) {
355 if (ipv6_addr_equal(local, &t->parms.laddr) &&
356 ipv6_addr_equal(remote, &t->parms.raddr)) {
357 if (create)
358 return ERR_PTR(-EEXIST);
359
360 return t;
361 }
362 }
363 if (!create)
364 return ERR_PTR(-ENODEV);
365 return ip6_tnl_create(net, p);
366 }
367
368 /**
369 * ip6_tnl_dev_uninit - tunnel device uninitializer
370 * @dev: the device to be destroyed
371 *
372 * Description:
373 * ip6_tnl_dev_uninit() removes tunnel from its list
374 **/
375
376 static void
377 ip6_tnl_dev_uninit(struct net_device *dev)
378 {
379 struct ip6_tnl *t = netdev_priv(dev);
380 struct net *net = t->net;
381 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
382
383 if (dev == ip6n->fb_tnl_dev)
384 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
385 else
386 ip6_tnl_unlink(ip6n, t);
387 dst_cache_reset(&t->dst_cache);
388 dev_put(dev);
389 }
390
391 /**
392 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
393 * @skb: received socket buffer
394 *
395 * Return:
396 * 0 if none was found,
397 * else index to encapsulation limit
398 **/
399
400 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
401 {
402 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
403 unsigned int nhoff = raw - skb->data;
404 unsigned int off = nhoff + sizeof(*ipv6h);
405 u8 next, nexthdr = ipv6h->nexthdr;
406
407 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
408 struct ipv6_opt_hdr *hdr;
409 u16 optlen;
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 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
417 if (frag_hdr->frag_off)
418 break;
419 optlen = 8;
420 } else if (nexthdr == NEXTHDR_AUTH) {
421 optlen = (hdr->hdrlen + 2) << 2;
422 } else {
423 optlen = ipv6_optlen(hdr);
424 }
425 /* cache hdr->nexthdr, since pskb_may_pull() might
426 * invalidate hdr
427 */
428 next = hdr->nexthdr;
429 if (nexthdr == NEXTHDR_DEST) {
430 u16 i = 2;
431
432 /* Remember : hdr is no longer valid at this point. */
433 if (!pskb_may_pull(skb, off + optlen))
434 break;
435
436 while (1) {
437 struct ipv6_tlv_tnl_enc_lim *tel;
438
439 /* No more room for encapsulation limit */
440 if (i + sizeof(*tel) > optlen)
441 break;
442
443 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
444 /* return index of option if found and valid */
445 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
446 tel->length == 1)
447 return i + off - nhoff;
448 /* else jump to next option */
449 if (tel->type)
450 i += tel->length + 2;
451 else
452 i++;
453 }
454 }
455 nexthdr = next;
456 off += optlen;
457 }
458 return 0;
459 }
460 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
461
462 /**
463 * ip6_tnl_err - tunnel error handler
464 *
465 * Description:
466 * ip6_tnl_err() should handle errors in the tunnel according
467 * to the specifications in RFC 2473.
468 **/
469
470 static int
471 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
472 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
473 {
474 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
475 struct net *net = dev_net(skb->dev);
476 u8 rel_type = ICMPV6_DEST_UNREACH;
477 u8 rel_code = ICMPV6_ADDR_UNREACH;
478 __u32 rel_info = 0;
479 struct ip6_tnl *t;
480 int err = -ENOENT;
481 int rel_msg = 0;
482 u8 tproto;
483 __u16 len;
484
485 /* If the packet doesn't contain the original IPv6 header we are
486 in trouble since we might need the source address for further
487 processing of the error. */
488
489 rcu_read_lock();
490 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
491 if (!t)
492 goto out;
493
494 tproto = READ_ONCE(t->parms.proto);
495 if (tproto != ipproto && tproto != 0)
496 goto out;
497
498 err = 0;
499
500 switch (*type) {
501 struct ipv6_tlv_tnl_enc_lim *tel;
502 __u32 mtu, teli;
503 case ICMPV6_DEST_UNREACH:
504 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
505 t->parms.name);
506 rel_msg = 1;
507 break;
508 case ICMPV6_TIME_EXCEED:
509 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
510 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
511 t->parms.name);
512 rel_msg = 1;
513 }
514 break;
515 case ICMPV6_PARAMPROB:
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 case ICMPV6_PKT_TOOBIG:
533 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
534 sock_net_uid(net, NULL));
535 mtu = *info - offset;
536 if (mtu < IPV6_MIN_MTU)
537 mtu = IPV6_MIN_MTU;
538 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
539 if (len > mtu) {
540 rel_type = ICMPV6_PKT_TOOBIG;
541 rel_code = 0;
542 rel_info = mtu;
543 rel_msg = 1;
544 }
545 break;
546 case NDISC_REDIRECT:
547 ip6_redirect(skb, net, skb->dev->ifindex, 0,
548 sock_net_uid(net, NULL));
549 break;
550 }
551
552 *type = rel_type;
553 *code = rel_code;
554 *info = rel_info;
555 *msg = rel_msg;
556
557 out:
558 rcu_read_unlock();
559 return err;
560 }
561
562 static int
563 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
564 u8 type, u8 code, int offset, __be32 info)
565 {
566 __u32 rel_info = ntohl(info);
567 const struct iphdr *eiph;
568 struct sk_buff *skb2;
569 int err, rel_msg = 0;
570 u8 rel_type = type;
571 u8 rel_code = code;
572 struct rtable *rt;
573 struct flowi4 fl4;
574
575 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
576 &rel_msg, &rel_info, offset);
577 if (err < 0)
578 return err;
579
580 if (rel_msg == 0)
581 return 0;
582
583 switch (rel_type) {
584 case ICMPV6_DEST_UNREACH:
585 if (rel_code != ICMPV6_ADDR_UNREACH)
586 return 0;
587 rel_type = ICMP_DEST_UNREACH;
588 rel_code = ICMP_HOST_UNREACH;
589 break;
590 case ICMPV6_PKT_TOOBIG:
591 if (rel_code != 0)
592 return 0;
593 rel_type = ICMP_DEST_UNREACH;
594 rel_code = ICMP_FRAG_NEEDED;
595 break;
596 default:
597 return 0;
598 }
599
600 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
601 return 0;
602
603 skb2 = skb_clone(skb, GFP_ATOMIC);
604 if (!skb2)
605 return 0;
606
607 skb_dst_drop(skb2);
608
609 skb_pull(skb2, offset);
610 skb_reset_network_header(skb2);
611 eiph = ip_hdr(skb2);
612
613 /* Try to guess incoming interface */
614 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
615 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
616 if (IS_ERR(rt))
617 goto out;
618
619 skb2->dev = rt->dst.dev;
620 ip_rt_put(rt);
621
622 /* route "incoming" packet */
623 if (rt->rt_flags & RTCF_LOCAL) {
624 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
625 eiph->daddr, eiph->saddr, 0, 0,
626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
627 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) {
628 if (!IS_ERR(rt))
629 ip_rt_put(rt);
630 goto out;
631 }
632 skb_dst_set(skb2, &rt->dst);
633 } else {
634 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
635 skb2->dev) ||
636 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
637 goto out;
638 }
639
640 /* change mtu on this route */
641 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
642 if (rel_info > dst_mtu(skb_dst(skb2)))
643 goto out;
644
645 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2,
646 rel_info);
647 }
648
649 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
650
651 out:
652 kfree_skb(skb2);
653 return 0;
654 }
655
656 static int
657 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
658 u8 type, u8 code, int offset, __be32 info)
659 {
660 __u32 rel_info = ntohl(info);
661 int err, rel_msg = 0;
662 u8 rel_type = type;
663 u8 rel_code = code;
664
665 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
666 &rel_msg, &rel_info, offset);
667 if (err < 0)
668 return err;
669
670 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
671 struct rt6_info *rt;
672 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
673
674 if (!skb2)
675 return 0;
676
677 skb_dst_drop(skb2);
678 skb_pull(skb2, offset);
679 skb_reset_network_header(skb2);
680
681 /* Try to guess incoming interface */
682 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
683 NULL, 0, 0);
684
685 if (rt && rt->dst.dev)
686 skb2->dev = rt->dst.dev;
687
688 icmpv6_send(skb2, rel_type, rel_code, rel_info);
689
690 ip6_rt_put(rt);
691
692 kfree_skb(skb2);
693 }
694
695 return 0;
696 }
697
698 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
699 const struct ipv6hdr *ipv6h,
700 struct sk_buff *skb)
701 {
702 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
703
704 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
705 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
706
707 return IP6_ECN_decapsulate(ipv6h, skb);
708 }
709
710 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
711 const struct ipv6hdr *ipv6h,
712 struct sk_buff *skb)
713 {
714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
715 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
716
717 return IP6_ECN_decapsulate(ipv6h, skb);
718 }
719
720 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
721 const struct in6_addr *laddr,
722 const struct in6_addr *raddr)
723 {
724 struct __ip6_tnl_parm *p = &t->parms;
725 int ltype = ipv6_addr_type(laddr);
726 int rtype = ipv6_addr_type(raddr);
727 __u32 flags = 0;
728
729 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
730 flags = IP6_TNL_F_CAP_PER_PACKET;
731 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
732 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
733 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
734 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
735 if (ltype&IPV6_ADDR_UNICAST)
736 flags |= IP6_TNL_F_CAP_XMIT;
737 if (rtype&IPV6_ADDR_UNICAST)
738 flags |= IP6_TNL_F_CAP_RCV;
739 }
740 return flags;
741 }
742 EXPORT_SYMBOL(ip6_tnl_get_cap);
743
744 /* called with rcu_read_lock() */
745 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
746 const struct in6_addr *laddr,
747 const struct in6_addr *raddr)
748 {
749 struct __ip6_tnl_parm *p = &t->parms;
750 int ret = 0;
751 struct net *net = t->net;
752
753 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
754 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
755 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
756 struct net_device *ldev = NULL;
757
758 if (p->link)
759 ldev = dev_get_by_index_rcu(net, p->link);
760
761 if ((ipv6_addr_is_multicast(laddr) ||
762 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
763 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
764 likely(!ipv6_chk_addr(net, raddr, NULL, 0))))
765 ret = 1;
766 }
767 return ret;
768 }
769 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
770
771 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
772 const struct tnl_ptk_info *tpi,
773 struct metadata_dst *tun_dst,
774 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
775 const struct ipv6hdr *ipv6h,
776 struct sk_buff *skb),
777 bool log_ecn_err)
778 {
779 struct pcpu_sw_netstats *tstats;
780 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
781 int err;
782
783 if ((!(tpi->flags & TUNNEL_CSUM) &&
784 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
785 ((tpi->flags & TUNNEL_CSUM) &&
786 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
787 tunnel->dev->stats.rx_crc_errors++;
788 tunnel->dev->stats.rx_errors++;
789 goto drop;
790 }
791
792 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
793 if (!(tpi->flags & TUNNEL_SEQ) ||
794 (tunnel->i_seqno &&
795 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
796 tunnel->dev->stats.rx_fifo_errors++;
797 tunnel->dev->stats.rx_errors++;
798 goto drop;
799 }
800 tunnel->i_seqno = ntohl(tpi->seq) + 1;
801 }
802
803 skb->protocol = tpi->proto;
804
805 /* Warning: All skb pointers will be invalidated! */
806 if (tunnel->dev->type == ARPHRD_ETHER) {
807 if (!pskb_may_pull(skb, ETH_HLEN)) {
808 tunnel->dev->stats.rx_length_errors++;
809 tunnel->dev->stats.rx_errors++;
810 goto drop;
811 }
812
813 ipv6h = ipv6_hdr(skb);
814 skb->protocol = eth_type_trans(skb, tunnel->dev);
815 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
816 } else {
817 skb->dev = tunnel->dev;
818 }
819
820 skb_reset_network_header(skb);
821 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
822
823 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
824
825 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
826 if (unlikely(err)) {
827 if (log_ecn_err)
828 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
829 &ipv6h->saddr,
830 ipv6_get_dsfield(ipv6h));
831 if (err > 1) {
832 ++tunnel->dev->stats.rx_frame_errors;
833 ++tunnel->dev->stats.rx_errors;
834 goto drop;
835 }
836 }
837
838 tstats = this_cpu_ptr(tunnel->dev->tstats);
839 u64_stats_update_begin(&tstats->syncp);
840 tstats->rx_packets++;
841 tstats->rx_bytes += skb->len;
842 u64_stats_update_end(&tstats->syncp);
843
844 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
845
846 if (tun_dst)
847 skb_dst_set(skb, (struct dst_entry *)tun_dst);
848
849 gro_cells_receive(&tunnel->gro_cells, skb);
850 return 0;
851
852 drop:
853 if (tun_dst)
854 dst_release((struct dst_entry *)tun_dst);
855 kfree_skb(skb);
856 return 0;
857 }
858
859 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
860 const struct tnl_ptk_info *tpi,
861 struct metadata_dst *tun_dst,
862 bool log_ecn_err)
863 {
864 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
865 log_ecn_err);
866 }
867 EXPORT_SYMBOL(ip6_tnl_rcv);
868
869 static const struct tnl_ptk_info tpi_v6 = {
870 /* no tunnel info required for ipxip6. */
871 .proto = htons(ETH_P_IPV6),
872 };
873
874 static const struct tnl_ptk_info tpi_v4 = {
875 /* no tunnel info required for ipxip6. */
876 .proto = htons(ETH_P_IP),
877 };
878
879 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
880 const struct tnl_ptk_info *tpi,
881 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
882 const struct ipv6hdr *ipv6h,
883 struct sk_buff *skb))
884 {
885 struct ip6_tnl *t;
886 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
887 struct metadata_dst *tun_dst = NULL;
888 int ret = -1;
889
890 rcu_read_lock();
891 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
892
893 if (t) {
894 u8 tproto = READ_ONCE(t->parms.proto);
895
896 if (tproto != ipproto && tproto != 0)
897 goto drop;
898 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
899 goto drop;
900 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
901 goto drop;
902 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
903 goto drop;
904 if (t->parms.collect_md) {
905 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
906 if (!tun_dst)
907 goto drop;
908 }
909 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
910 log_ecn_error);
911 }
912
913 rcu_read_unlock();
914
915 return ret;
916
917 drop:
918 rcu_read_unlock();
919 kfree_skb(skb);
920 return 0;
921 }
922
923 static int ip4ip6_rcv(struct sk_buff *skb)
924 {
925 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
926 ip4ip6_dscp_ecn_decapsulate);
927 }
928
929 static int ip6ip6_rcv(struct sk_buff *skb)
930 {
931 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
932 ip6ip6_dscp_ecn_decapsulate);
933 }
934
935 struct ipv6_tel_txoption {
936 struct ipv6_txoptions ops;
937 __u8 dst_opt[8];
938 };
939
940 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
941 {
942 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
943
944 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
945 opt->dst_opt[3] = 1;
946 opt->dst_opt[4] = encap_limit;
947 opt->dst_opt[5] = IPV6_TLV_PADN;
948 opt->dst_opt[6] = 1;
949
950 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
951 opt->ops.opt_nflen = 8;
952 }
953
954 /**
955 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
956 * @t: the outgoing tunnel device
957 * @hdr: IPv6 header from the incoming packet
958 *
959 * Description:
960 * Avoid trivial tunneling loop by checking that tunnel exit-point
961 * doesn't match source of incoming packet.
962 *
963 * Return:
964 * 1 if conflict,
965 * 0 else
966 **/
967
968 static inline bool
969 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
970 {
971 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
972 }
973
974 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
975 const struct in6_addr *laddr,
976 const struct in6_addr *raddr)
977 {
978 struct __ip6_tnl_parm *p = &t->parms;
979 int ret = 0;
980 struct net *net = t->net;
981
982 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
983 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
984 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
985 struct net_device *ldev = NULL;
986
987 rcu_read_lock();
988 if (p->link)
989 ldev = dev_get_by_index_rcu(net, p->link);
990
991 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
992 pr_warn("%s xmit: Local address not yet configured!\n",
993 p->name);
994 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
995 !ipv6_addr_is_multicast(raddr) &&
996 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
997 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
998 p->name);
999 else
1000 ret = 1;
1001 rcu_read_unlock();
1002 }
1003 return ret;
1004 }
1005 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1006
1007 /**
1008 * ip6_tnl_xmit - encapsulate packet and send
1009 * @skb: the outgoing socket buffer
1010 * @dev: the outgoing tunnel device
1011 * @dsfield: dscp code for outer header
1012 * @fl6: flow of tunneled packet
1013 * @encap_limit: encapsulation limit
1014 * @pmtu: Path MTU is stored if packet is too big
1015 * @proto: next header value
1016 *
1017 * Description:
1018 * Build new header and do some sanity checks on the packet before sending
1019 * it.
1020 *
1021 * Return:
1022 * 0 on success
1023 * -1 fail
1024 * %-EMSGSIZE message too big. return mtu in this case.
1025 **/
1026
1027 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1028 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1029 __u8 proto)
1030 {
1031 struct ip6_tnl *t = netdev_priv(dev);
1032 struct net *net = t->net;
1033 struct net_device_stats *stats = &t->dev->stats;
1034 struct ipv6hdr *ipv6h;
1035 struct ipv6_tel_txoption opt;
1036 struct dst_entry *dst = NULL, *ndst = NULL;
1037 struct net_device *tdev;
1038 int mtu;
1039 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1040 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1041 unsigned int max_headroom = psh_hlen;
1042 bool use_cache = false;
1043 u8 hop_limit;
1044 int err = -1;
1045
1046 if (t->parms.collect_md) {
1047 hop_limit = skb_tunnel_info(skb)->key.ttl;
1048 goto route_lookup;
1049 } else {
1050 hop_limit = t->parms.hop_limit;
1051 }
1052
1053 /* NBMA tunnel */
1054 if (ipv6_addr_any(&t->parms.raddr)) {
1055 if (skb->protocol == htons(ETH_P_IPV6)) {
1056 struct in6_addr *addr6;
1057 struct neighbour *neigh;
1058 int addr_type;
1059
1060 if (!skb_dst(skb))
1061 goto tx_err_link_failure;
1062
1063 neigh = dst_neigh_lookup(skb_dst(skb),
1064 &ipv6_hdr(skb)->daddr);
1065 if (!neigh)
1066 goto tx_err_link_failure;
1067
1068 addr6 = (struct in6_addr *)&neigh->primary_key;
1069 addr_type = ipv6_addr_type(addr6);
1070
1071 if (addr_type == IPV6_ADDR_ANY)
1072 addr6 = &ipv6_hdr(skb)->daddr;
1073
1074 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1075 neigh_release(neigh);
1076 }
1077 } else if (!(t->parms.flags &
1078 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) {
1079 /* enable the cache only only if the routing decision does
1080 * not depend on the current inner header value
1081 */
1082 use_cache = true;
1083 }
1084
1085 if (use_cache)
1086 dst = dst_cache_get(&t->dst_cache);
1087
1088 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1089 goto tx_err_link_failure;
1090
1091 if (!dst) {
1092 route_lookup:
1093 /* add dsfield to flowlabel for route lookup */
1094 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1095
1096 dst = ip6_route_output(net, NULL, fl6);
1097
1098 if (dst->error)
1099 goto tx_err_link_failure;
1100 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1101 if (IS_ERR(dst)) {
1102 err = PTR_ERR(dst);
1103 dst = NULL;
1104 goto tx_err_link_failure;
1105 }
1106 if (t->parms.collect_md &&
1107 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1108 &fl6->daddr, 0, &fl6->saddr))
1109 goto tx_err_link_failure;
1110 ndst = dst;
1111 }
1112
1113 tdev = dst->dev;
1114
1115 if (tdev == dev) {
1116 stats->collisions++;
1117 net_warn_ratelimited("%s: Local routing loop detected!\n",
1118 t->parms.name);
1119 goto tx_err_dst_release;
1120 }
1121 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1122 if (encap_limit >= 0) {
1123 max_headroom += 8;
1124 mtu -= 8;
1125 }
1126 if (mtu < IPV6_MIN_MTU)
1127 mtu = IPV6_MIN_MTU;
1128 if (skb_dst(skb) && !t->parms.collect_md)
1129 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1130 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1131 *pmtu = mtu;
1132 err = -EMSGSIZE;
1133 goto tx_err_dst_release;
1134 }
1135
1136 if (t->err_count > 0) {
1137 if (time_before(jiffies,
1138 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1139 t->err_count--;
1140
1141 dst_link_failure(skb);
1142 } else {
1143 t->err_count = 0;
1144 }
1145 }
1146
1147 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1148
1149 /*
1150 * Okay, now see if we can stuff it in the buffer as-is.
1151 */
1152 max_headroom += LL_RESERVED_SPACE(tdev);
1153
1154 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1155 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1156 struct sk_buff *new_skb;
1157
1158 new_skb = skb_realloc_headroom(skb, max_headroom);
1159 if (!new_skb)
1160 goto tx_err_dst_release;
1161
1162 if (skb->sk)
1163 skb_set_owner_w(new_skb, skb->sk);
1164 consume_skb(skb);
1165 skb = new_skb;
1166 }
1167
1168 if (t->parms.collect_md) {
1169 if (t->encap.type != TUNNEL_ENCAP_NONE)
1170 goto tx_err_dst_release;
1171 } else {
1172 if (use_cache && ndst)
1173 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1174 }
1175 skb_dst_set(skb, dst);
1176
1177 if (encap_limit >= 0) {
1178 init_tel_txopt(&opt, encap_limit);
1179 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1180 }
1181 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst);
1182
1183 /* Calculate max headroom for all the headers and adjust
1184 * needed_headroom if necessary.
1185 */
1186 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1187 + dst->header_len + t->hlen;
1188 if (max_headroom > dev->needed_headroom)
1189 dev->needed_headroom = max_headroom;
1190
1191 err = ip6_tnl_encap(skb, t, &proto, fl6);
1192 if (err)
1193 return err;
1194
1195 skb_push(skb, sizeof(struct ipv6hdr));
1196 skb_reset_network_header(skb);
1197 ipv6h = ipv6_hdr(skb);
1198 ip6_flow_hdr(ipv6h, dsfield,
1199 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1200 ipv6h->hop_limit = hop_limit;
1201 ipv6h->nexthdr = proto;
1202 ipv6h->saddr = fl6->saddr;
1203 ipv6h->daddr = fl6->daddr;
1204 ip6tunnel_xmit(NULL, skb, dev);
1205 return 0;
1206 tx_err_link_failure:
1207 stats->tx_carrier_errors++;
1208 dst_link_failure(skb);
1209 tx_err_dst_release:
1210 dst_release(dst);
1211 return err;
1212 }
1213 EXPORT_SYMBOL(ip6_tnl_xmit);
1214
1215 static inline int
1216 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1217 {
1218 struct ip6_tnl *t = netdev_priv(dev);
1219 const struct iphdr *iph = ip_hdr(skb);
1220 int encap_limit = -1;
1221 struct flowi6 fl6;
1222 __u8 dsfield;
1223 __u32 mtu;
1224 u8 tproto;
1225 int err;
1226
1227 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1228
1229 tproto = READ_ONCE(t->parms.proto);
1230 if (tproto != IPPROTO_IPIP && tproto != 0)
1231 return -1;
1232
1233 if (t->parms.collect_md) {
1234 struct ip_tunnel_info *tun_info;
1235 const struct ip_tunnel_key *key;
1236
1237 tun_info = skb_tunnel_info(skb);
1238 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1239 ip_tunnel_info_af(tun_info) != AF_INET6))
1240 return -1;
1241 key = &tun_info->key;
1242 memset(&fl6, 0, sizeof(fl6));
1243 fl6.flowi6_proto = IPPROTO_IPIP;
1244 fl6.daddr = key->u.ipv6.dst;
1245 fl6.flowlabel = key->label;
1246 dsfield = key->tos;
1247 } else {
1248 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1249 encap_limit = t->parms.encap_limit;
1250
1251 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1252 fl6.flowi6_proto = IPPROTO_IPIP;
1253
1254 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1255 dsfield = ipv4_get_dsfield(iph);
1256 else
1257 dsfield = ip6_tclass(t->parms.flowinfo);
1258 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1259 fl6.flowi6_mark = skb->mark;
1260 else
1261 fl6.flowi6_mark = t->parms.fwmark;
1262 }
1263
1264 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1265
1266 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1267 return -1;
1268
1269 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1270
1271 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1272
1273 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1274 IPPROTO_IPIP);
1275 if (err != 0) {
1276 /* XXX: send ICMP error even if DF is not set. */
1277 if (err == -EMSGSIZE)
1278 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1279 htonl(mtu));
1280 return -1;
1281 }
1282
1283 return 0;
1284 }
1285
1286 static inline int
1287 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1288 {
1289 struct ip6_tnl *t = netdev_priv(dev);
1290 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1291 int encap_limit = -1;
1292 __u16 offset;
1293 struct flowi6 fl6;
1294 __u8 dsfield;
1295 __u32 mtu;
1296 u8 tproto;
1297 int err;
1298
1299 tproto = READ_ONCE(t->parms.proto);
1300 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1301 ip6_tnl_addr_conflict(t, ipv6h))
1302 return -1;
1303
1304 if (t->parms.collect_md) {
1305 struct ip_tunnel_info *tun_info;
1306 const struct ip_tunnel_key *key;
1307
1308 tun_info = skb_tunnel_info(skb);
1309 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1310 ip_tunnel_info_af(tun_info) != AF_INET6))
1311 return -1;
1312 key = &tun_info->key;
1313 memset(&fl6, 0, sizeof(fl6));
1314 fl6.flowi6_proto = IPPROTO_IPV6;
1315 fl6.daddr = key->u.ipv6.dst;
1316 fl6.flowlabel = key->label;
1317 dsfield = key->tos;
1318 } else {
1319 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1320 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1321 ipv6h = ipv6_hdr(skb);
1322 if (offset > 0) {
1323 struct ipv6_tlv_tnl_enc_lim *tel;
1324
1325 tel = (void *)&skb_network_header(skb)[offset];
1326 if (tel->encap_limit == 0) {
1327 icmpv6_send(skb, ICMPV6_PARAMPROB,
1328 ICMPV6_HDR_FIELD, offset + 2);
1329 return -1;
1330 }
1331 encap_limit = tel->encap_limit - 1;
1332 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1333 encap_limit = t->parms.encap_limit;
1334 }
1335
1336 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1337 fl6.flowi6_proto = IPPROTO_IPV6;
1338
1339 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1340 dsfield = ipv6_get_dsfield(ipv6h);
1341 else
1342 dsfield = ip6_tclass(t->parms.flowinfo);
1343 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1344 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1345 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1346 fl6.flowi6_mark = skb->mark;
1347 else
1348 fl6.flowi6_mark = t->parms.fwmark;
1349 }
1350
1351 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1352
1353 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1354 return -1;
1355
1356 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1357
1358 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1359
1360 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1361 IPPROTO_IPV6);
1362 if (err != 0) {
1363 if (err == -EMSGSIZE)
1364 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1365 return -1;
1366 }
1367
1368 return 0;
1369 }
1370
1371 static netdev_tx_t
1372 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1373 {
1374 struct ip6_tnl *t = netdev_priv(dev);
1375 struct net_device_stats *stats = &t->dev->stats;
1376 int ret;
1377
1378 switch (skb->protocol) {
1379 case htons(ETH_P_IP):
1380 ret = ip4ip6_tnl_xmit(skb, dev);
1381 break;
1382 case htons(ETH_P_IPV6):
1383 ret = ip6ip6_tnl_xmit(skb, dev);
1384 break;
1385 default:
1386 goto tx_err;
1387 }
1388
1389 if (ret < 0)
1390 goto tx_err;
1391
1392 return NETDEV_TX_OK;
1393
1394 tx_err:
1395 stats->tx_errors++;
1396 stats->tx_dropped++;
1397 kfree_skb(skb);
1398 return NETDEV_TX_OK;
1399 }
1400
1401 static void ip6_tnl_link_config(struct ip6_tnl *t)
1402 {
1403 struct net_device *dev = t->dev;
1404 struct __ip6_tnl_parm *p = &t->parms;
1405 struct flowi6 *fl6 = &t->fl.u.ip6;
1406 int t_hlen;
1407
1408 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1409 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1410
1411 /* Set up flowi template */
1412 fl6->saddr = p->laddr;
1413 fl6->daddr = p->raddr;
1414 fl6->flowi6_oif = p->link;
1415 fl6->flowlabel = 0;
1416
1417 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1418 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1419 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1420 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1421
1422 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1423 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1424
1425 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1426 dev->flags |= IFF_POINTOPOINT;
1427 else
1428 dev->flags &= ~IFF_POINTOPOINT;
1429
1430 t->tun_hlen = 0;
1431 t->hlen = t->encap_hlen + t->tun_hlen;
1432 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1433
1434 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1435 int strict = (ipv6_addr_type(&p->raddr) &
1436 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1437
1438 struct rt6_info *rt = rt6_lookup(t->net,
1439 &p->raddr, &p->laddr,
1440 p->link, strict);
1441
1442 if (!rt)
1443 return;
1444
1445 if (rt->dst.dev) {
1446 dev->hard_header_len = rt->dst.dev->hard_header_len +
1447 t_hlen;
1448
1449 dev->mtu = rt->dst.dev->mtu - t_hlen;
1450 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1451 dev->mtu -= 8;
1452
1453 if (dev->mtu < IPV6_MIN_MTU)
1454 dev->mtu = IPV6_MIN_MTU;
1455 }
1456 ip6_rt_put(rt);
1457 }
1458 }
1459
1460 /**
1461 * ip6_tnl_change - update the tunnel parameters
1462 * @t: tunnel to be changed
1463 * @p: tunnel configuration parameters
1464 *
1465 * Description:
1466 * ip6_tnl_change() updates the tunnel parameters
1467 **/
1468
1469 static int
1470 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1471 {
1472 t->parms.laddr = p->laddr;
1473 t->parms.raddr = p->raddr;
1474 t->parms.flags = p->flags;
1475 t->parms.hop_limit = p->hop_limit;
1476 t->parms.encap_limit = p->encap_limit;
1477 t->parms.flowinfo = p->flowinfo;
1478 t->parms.link = p->link;
1479 t->parms.proto = p->proto;
1480 t->parms.fwmark = p->fwmark;
1481 dst_cache_reset(&t->dst_cache);
1482 ip6_tnl_link_config(t);
1483 return 0;
1484 }
1485
1486 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1487 {
1488 struct net *net = t->net;
1489 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1490 int err;
1491
1492 ip6_tnl_unlink(ip6n, t);
1493 synchronize_net();
1494 err = ip6_tnl_change(t, p);
1495 ip6_tnl_link(ip6n, t);
1496 netdev_state_change(t->dev);
1497 return err;
1498 }
1499
1500 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1501 {
1502 /* for default tnl0 device allow to change only the proto */
1503 t->parms.proto = p->proto;
1504 netdev_state_change(t->dev);
1505 return 0;
1506 }
1507
1508 static void
1509 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1510 {
1511 p->laddr = u->laddr;
1512 p->raddr = u->raddr;
1513 p->flags = u->flags;
1514 p->hop_limit = u->hop_limit;
1515 p->encap_limit = u->encap_limit;
1516 p->flowinfo = u->flowinfo;
1517 p->link = u->link;
1518 p->proto = u->proto;
1519 memcpy(p->name, u->name, sizeof(u->name));
1520 }
1521
1522 static void
1523 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1524 {
1525 u->laddr = p->laddr;
1526 u->raddr = p->raddr;
1527 u->flags = p->flags;
1528 u->hop_limit = p->hop_limit;
1529 u->encap_limit = p->encap_limit;
1530 u->flowinfo = p->flowinfo;
1531 u->link = p->link;
1532 u->proto = p->proto;
1533 memcpy(u->name, p->name, sizeof(u->name));
1534 }
1535
1536 /**
1537 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1538 * @dev: virtual device associated with tunnel
1539 * @ifr: parameters passed from userspace
1540 * @cmd: command to be performed
1541 *
1542 * Description:
1543 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1544 * from userspace.
1545 *
1546 * The possible commands are the following:
1547 * %SIOCGETTUNNEL: get tunnel parameters for device
1548 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1549 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1550 * %SIOCDELTUNNEL: delete tunnel
1551 *
1552 * The fallback device "ip6tnl0", created during module
1553 * initialization, can be used for creating other tunnel devices.
1554 *
1555 * Return:
1556 * 0 on success,
1557 * %-EFAULT if unable to copy data to or from userspace,
1558 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1559 * %-EINVAL if passed tunnel parameters are invalid,
1560 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1561 * %-ENODEV if attempting to change or delete a nonexisting device
1562 **/
1563
1564 static int
1565 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1566 {
1567 int err = 0;
1568 struct ip6_tnl_parm p;
1569 struct __ip6_tnl_parm p1;
1570 struct ip6_tnl *t = netdev_priv(dev);
1571 struct net *net = t->net;
1572 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1573
1574 memset(&p1, 0, sizeof(p1));
1575
1576 switch (cmd) {
1577 case SIOCGETTUNNEL:
1578 if (dev == ip6n->fb_tnl_dev) {
1579 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1580 err = -EFAULT;
1581 break;
1582 }
1583 ip6_tnl_parm_from_user(&p1, &p);
1584 t = ip6_tnl_locate(net, &p1, 0);
1585 if (IS_ERR(t))
1586 t = netdev_priv(dev);
1587 } else {
1588 memset(&p, 0, sizeof(p));
1589 }
1590 ip6_tnl_parm_to_user(&p, &t->parms);
1591 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1592 err = -EFAULT;
1593 }
1594 break;
1595 case SIOCADDTUNNEL:
1596 case SIOCCHGTUNNEL:
1597 err = -EPERM;
1598 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1599 break;
1600 err = -EFAULT;
1601 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1602 break;
1603 err = -EINVAL;
1604 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1605 p.proto != 0)
1606 break;
1607 ip6_tnl_parm_from_user(&p1, &p);
1608 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1609 if (cmd == SIOCCHGTUNNEL) {
1610 if (!IS_ERR(t)) {
1611 if (t->dev != dev) {
1612 err = -EEXIST;
1613 break;
1614 }
1615 } else
1616 t = netdev_priv(dev);
1617 if (dev == ip6n->fb_tnl_dev)
1618 err = ip6_tnl0_update(t, &p1);
1619 else
1620 err = ip6_tnl_update(t, &p1);
1621 }
1622 if (!IS_ERR(t)) {
1623 err = 0;
1624 ip6_tnl_parm_to_user(&p, &t->parms);
1625 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1626 err = -EFAULT;
1627
1628 } else {
1629 err = PTR_ERR(t);
1630 }
1631 break;
1632 case SIOCDELTUNNEL:
1633 err = -EPERM;
1634 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1635 break;
1636
1637 if (dev == ip6n->fb_tnl_dev) {
1638 err = -EFAULT;
1639 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1640 break;
1641 err = -ENOENT;
1642 ip6_tnl_parm_from_user(&p1, &p);
1643 t = ip6_tnl_locate(net, &p1, 0);
1644 if (IS_ERR(t))
1645 break;
1646 err = -EPERM;
1647 if (t->dev == ip6n->fb_tnl_dev)
1648 break;
1649 dev = t->dev;
1650 }
1651 err = 0;
1652 unregister_netdevice(dev);
1653 break;
1654 default:
1655 err = -EINVAL;
1656 }
1657 return err;
1658 }
1659
1660 /**
1661 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1662 * @dev: virtual device associated with tunnel
1663 * @new_mtu: the new mtu
1664 *
1665 * Return:
1666 * 0 on success,
1667 * %-EINVAL if mtu too small
1668 **/
1669
1670 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1671 {
1672 struct ip6_tnl *tnl = netdev_priv(dev);
1673
1674 if (tnl->parms.proto == IPPROTO_IPIP) {
1675 if (new_mtu < ETH_MIN_MTU)
1676 return -EINVAL;
1677 } else {
1678 if (new_mtu < IPV6_MIN_MTU)
1679 return -EINVAL;
1680 }
1681 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1682 return -EINVAL;
1683 dev->mtu = new_mtu;
1684 return 0;
1685 }
1686 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1687
1688 int ip6_tnl_get_iflink(const struct net_device *dev)
1689 {
1690 struct ip6_tnl *t = netdev_priv(dev);
1691
1692 return t->parms.link;
1693 }
1694 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1695
1696 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1697 unsigned int num)
1698 {
1699 if (num >= MAX_IPTUN_ENCAP_OPS)
1700 return -ERANGE;
1701
1702 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1703 &ip6tun_encaps[num],
1704 NULL, ops) ? 0 : -1;
1705 }
1706 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1707
1708 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1709 unsigned int num)
1710 {
1711 int ret;
1712
1713 if (num >= MAX_IPTUN_ENCAP_OPS)
1714 return -ERANGE;
1715
1716 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1717 &ip6tun_encaps[num],
1718 ops, NULL) == ops) ? 0 : -1;
1719
1720 synchronize_net();
1721
1722 return ret;
1723 }
1724 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1725
1726 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1727 struct ip_tunnel_encap *ipencap)
1728 {
1729 int hlen;
1730
1731 memset(&t->encap, 0, sizeof(t->encap));
1732
1733 hlen = ip6_encap_hlen(ipencap);
1734 if (hlen < 0)
1735 return hlen;
1736
1737 t->encap.type = ipencap->type;
1738 t->encap.sport = ipencap->sport;
1739 t->encap.dport = ipencap->dport;
1740 t->encap.flags = ipencap->flags;
1741
1742 t->encap_hlen = hlen;
1743 t->hlen = t->encap_hlen + t->tun_hlen;
1744
1745 return 0;
1746 }
1747 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1748
1749 static const struct net_device_ops ip6_tnl_netdev_ops = {
1750 .ndo_init = ip6_tnl_dev_init,
1751 .ndo_uninit = ip6_tnl_dev_uninit,
1752 .ndo_start_xmit = ip6_tnl_start_xmit,
1753 .ndo_do_ioctl = ip6_tnl_ioctl,
1754 .ndo_change_mtu = ip6_tnl_change_mtu,
1755 .ndo_get_stats = ip6_get_stats,
1756 .ndo_get_iflink = ip6_tnl_get_iflink,
1757 };
1758
1759 #define IPXIPX_FEATURES (NETIF_F_SG | \
1760 NETIF_F_FRAGLIST | \
1761 NETIF_F_HIGHDMA | \
1762 NETIF_F_GSO_SOFTWARE | \
1763 NETIF_F_HW_CSUM)
1764
1765 /**
1766 * ip6_tnl_dev_setup - setup virtual tunnel device
1767 * @dev: virtual device associated with tunnel
1768 *
1769 * Description:
1770 * Initialize function pointers and device parameters
1771 **/
1772
1773 static void ip6_tnl_dev_setup(struct net_device *dev)
1774 {
1775 dev->netdev_ops = &ip6_tnl_netdev_ops;
1776 dev->needs_free_netdev = true;
1777 dev->priv_destructor = ip6_dev_free;
1778
1779 dev->type = ARPHRD_TUNNEL6;
1780 dev->flags |= IFF_NOARP;
1781 dev->addr_len = sizeof(struct in6_addr);
1782 dev->features |= NETIF_F_LLTX;
1783 netif_keep_dst(dev);
1784
1785 dev->features |= IPXIPX_FEATURES;
1786 dev->hw_features |= IPXIPX_FEATURES;
1787
1788 /* This perm addr will be used as interface identifier by IPv6 */
1789 dev->addr_assign_type = NET_ADDR_RANDOM;
1790 eth_random_addr(dev->perm_addr);
1791 }
1792
1793
1794 /**
1795 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1796 * @dev: virtual device associated with tunnel
1797 **/
1798
1799 static inline int
1800 ip6_tnl_dev_init_gen(struct net_device *dev)
1801 {
1802 struct ip6_tnl *t = netdev_priv(dev);
1803 int ret;
1804 int t_hlen;
1805
1806 t->dev = dev;
1807 t->net = dev_net(dev);
1808 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1809 if (!dev->tstats)
1810 return -ENOMEM;
1811
1812 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1813 if (ret)
1814 goto free_stats;
1815
1816 ret = gro_cells_init(&t->gro_cells, dev);
1817 if (ret)
1818 goto destroy_dst;
1819
1820 t->tun_hlen = 0;
1821 t->hlen = t->encap_hlen + t->tun_hlen;
1822 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1823
1824 dev->type = ARPHRD_TUNNEL6;
1825 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1826 dev->mtu = ETH_DATA_LEN - t_hlen;
1827 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1828 dev->mtu -= 8;
1829 dev->min_mtu = ETH_MIN_MTU;
1830 dev->max_mtu = 0xFFF8 - dev->hard_header_len;
1831
1832 return 0;
1833
1834 destroy_dst:
1835 dst_cache_destroy(&t->dst_cache);
1836 free_stats:
1837 free_percpu(dev->tstats);
1838 dev->tstats = NULL;
1839
1840 return ret;
1841 }
1842
1843 /**
1844 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1845 * @dev: virtual device associated with tunnel
1846 **/
1847
1848 static int ip6_tnl_dev_init(struct net_device *dev)
1849 {
1850 struct ip6_tnl *t = netdev_priv(dev);
1851 int err = ip6_tnl_dev_init_gen(dev);
1852
1853 if (err)
1854 return err;
1855 ip6_tnl_link_config(t);
1856 if (t->parms.collect_md) {
1857 dev->features |= NETIF_F_NETNS_LOCAL;
1858 netif_keep_dst(dev);
1859 }
1860 return 0;
1861 }
1862
1863 /**
1864 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1865 * @dev: fallback device
1866 *
1867 * Return: 0
1868 **/
1869
1870 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1871 {
1872 struct ip6_tnl *t = netdev_priv(dev);
1873 struct net *net = dev_net(dev);
1874 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1875
1876 t->parms.proto = IPPROTO_IPV6;
1877 dev_hold(dev);
1878
1879 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1880 return 0;
1881 }
1882
1883 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1884 struct netlink_ext_ack *extack)
1885 {
1886 u8 proto;
1887
1888 if (!data || !data[IFLA_IPTUN_PROTO])
1889 return 0;
1890
1891 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1892 if (proto != IPPROTO_IPV6 &&
1893 proto != IPPROTO_IPIP &&
1894 proto != 0)
1895 return -EINVAL;
1896
1897 return 0;
1898 }
1899
1900 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1901 struct __ip6_tnl_parm *parms)
1902 {
1903 memset(parms, 0, sizeof(*parms));
1904
1905 if (!data)
1906 return;
1907
1908 if (data[IFLA_IPTUN_LINK])
1909 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1910
1911 if (data[IFLA_IPTUN_LOCAL])
1912 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1913
1914 if (data[IFLA_IPTUN_REMOTE])
1915 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1916
1917 if (data[IFLA_IPTUN_TTL])
1918 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1919
1920 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1921 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1922
1923 if (data[IFLA_IPTUN_FLOWINFO])
1924 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1925
1926 if (data[IFLA_IPTUN_FLAGS])
1927 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1928
1929 if (data[IFLA_IPTUN_PROTO])
1930 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1931
1932 if (data[IFLA_IPTUN_COLLECT_METADATA])
1933 parms->collect_md = true;
1934
1935 if (data[IFLA_IPTUN_FWMARK])
1936 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1937 }
1938
1939 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1940 struct ip_tunnel_encap *ipencap)
1941 {
1942 bool ret = false;
1943
1944 memset(ipencap, 0, sizeof(*ipencap));
1945
1946 if (!data)
1947 return ret;
1948
1949 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1950 ret = true;
1951 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1952 }
1953
1954 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1955 ret = true;
1956 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1957 }
1958
1959 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1960 ret = true;
1961 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1962 }
1963
1964 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1965 ret = true;
1966 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1967 }
1968
1969 return ret;
1970 }
1971
1972 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1973 struct nlattr *tb[], struct nlattr *data[],
1974 struct netlink_ext_ack *extack)
1975 {
1976 struct net *net = dev_net(dev);
1977 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1978 struct ip6_tnl *nt, *t;
1979 struct ip_tunnel_encap ipencap;
1980
1981 nt = netdev_priv(dev);
1982
1983 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1984 int err = ip6_tnl_encap_setup(nt, &ipencap);
1985
1986 if (err < 0)
1987 return err;
1988 }
1989
1990 ip6_tnl_netlink_parms(data, &nt->parms);
1991
1992 if (nt->parms.collect_md) {
1993 if (rtnl_dereference(ip6n->collect_md_tun))
1994 return -EEXIST;
1995 } else {
1996 t = ip6_tnl_locate(net, &nt->parms, 0);
1997 if (!IS_ERR(t))
1998 return -EEXIST;
1999 }
2000
2001 return ip6_tnl_create2(dev);
2002 }
2003
2004 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2005 struct nlattr *data[],
2006 struct netlink_ext_ack *extack)
2007 {
2008 struct ip6_tnl *t = netdev_priv(dev);
2009 struct __ip6_tnl_parm p;
2010 struct net *net = t->net;
2011 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2012 struct ip_tunnel_encap ipencap;
2013
2014 if (dev == ip6n->fb_tnl_dev)
2015 return -EINVAL;
2016
2017 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2018 int err = ip6_tnl_encap_setup(t, &ipencap);
2019
2020 if (err < 0)
2021 return err;
2022 }
2023 ip6_tnl_netlink_parms(data, &p);
2024 if (p.collect_md)
2025 return -EINVAL;
2026
2027 t = ip6_tnl_locate(net, &p, 0);
2028 if (!IS_ERR(t)) {
2029 if (t->dev != dev)
2030 return -EEXIST;
2031 } else
2032 t = netdev_priv(dev);
2033
2034 return ip6_tnl_update(t, &p);
2035 }
2036
2037 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2038 {
2039 struct net *net = dev_net(dev);
2040 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2041
2042 if (dev != ip6n->fb_tnl_dev)
2043 unregister_netdevice_queue(dev, head);
2044 }
2045
2046 static size_t ip6_tnl_get_size(const struct net_device *dev)
2047 {
2048 return
2049 /* IFLA_IPTUN_LINK */
2050 nla_total_size(4) +
2051 /* IFLA_IPTUN_LOCAL */
2052 nla_total_size(sizeof(struct in6_addr)) +
2053 /* IFLA_IPTUN_REMOTE */
2054 nla_total_size(sizeof(struct in6_addr)) +
2055 /* IFLA_IPTUN_TTL */
2056 nla_total_size(1) +
2057 /* IFLA_IPTUN_ENCAP_LIMIT */
2058 nla_total_size(1) +
2059 /* IFLA_IPTUN_FLOWINFO */
2060 nla_total_size(4) +
2061 /* IFLA_IPTUN_FLAGS */
2062 nla_total_size(4) +
2063 /* IFLA_IPTUN_PROTO */
2064 nla_total_size(1) +
2065 /* IFLA_IPTUN_ENCAP_TYPE */
2066 nla_total_size(2) +
2067 /* IFLA_IPTUN_ENCAP_FLAGS */
2068 nla_total_size(2) +
2069 /* IFLA_IPTUN_ENCAP_SPORT */
2070 nla_total_size(2) +
2071 /* IFLA_IPTUN_ENCAP_DPORT */
2072 nla_total_size(2) +
2073 /* IFLA_IPTUN_COLLECT_METADATA */
2074 nla_total_size(0) +
2075 /* IFLA_IPTUN_FWMARK */
2076 nla_total_size(4) +
2077 0;
2078 }
2079
2080 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2081 {
2082 struct ip6_tnl *tunnel = netdev_priv(dev);
2083 struct __ip6_tnl_parm *parm = &tunnel->parms;
2084
2085 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2086 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2087 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2088 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2089 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2090 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2091 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2092 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2093 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2094 goto nla_put_failure;
2095
2096 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2097 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2098 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2099 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2100 goto nla_put_failure;
2101
2102 if (parm->collect_md)
2103 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2104 goto nla_put_failure;
2105
2106 return 0;
2107
2108 nla_put_failure:
2109 return -EMSGSIZE;
2110 }
2111
2112 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2113 {
2114 struct ip6_tnl *tunnel = netdev_priv(dev);
2115
2116 return tunnel->net;
2117 }
2118 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2119
2120 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2121 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2122 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2123 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2124 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2125 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2126 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2127 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2128 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2129 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2130 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2131 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2132 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2133 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2134 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2135 };
2136
2137 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2138 .kind = "ip6tnl",
2139 .maxtype = IFLA_IPTUN_MAX,
2140 .policy = ip6_tnl_policy,
2141 .priv_size = sizeof(struct ip6_tnl),
2142 .setup = ip6_tnl_dev_setup,
2143 .validate = ip6_tnl_validate,
2144 .newlink = ip6_tnl_newlink,
2145 .changelink = ip6_tnl_changelink,
2146 .dellink = ip6_tnl_dellink,
2147 .get_size = ip6_tnl_get_size,
2148 .fill_info = ip6_tnl_fill_info,
2149 .get_link_net = ip6_tnl_get_link_net,
2150 };
2151
2152 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2153 .handler = ip4ip6_rcv,
2154 .err_handler = ip4ip6_err,
2155 .priority = 1,
2156 };
2157
2158 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2159 .handler = ip6ip6_rcv,
2160 .err_handler = ip6ip6_err,
2161 .priority = 1,
2162 };
2163
2164 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2165 {
2166 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2167 struct net_device *dev, *aux;
2168 int h;
2169 struct ip6_tnl *t;
2170
2171 for_each_netdev_safe(net, dev, aux)
2172 if (dev->rtnl_link_ops == &ip6_link_ops)
2173 unregister_netdevice_queue(dev, list);
2174
2175 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2176 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2177 while (t) {
2178 /* If dev is in the same netns, it has already
2179 * been added to the list by the previous loop.
2180 */
2181 if (!net_eq(dev_net(t->dev), net))
2182 unregister_netdevice_queue(t->dev, list);
2183 t = rtnl_dereference(t->next);
2184 }
2185 }
2186 }
2187
2188 static int __net_init ip6_tnl_init_net(struct net *net)
2189 {
2190 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2191 struct ip6_tnl *t = NULL;
2192 int err;
2193
2194 ip6n->tnls[0] = ip6n->tnls_wc;
2195 ip6n->tnls[1] = ip6n->tnls_r_l;
2196
2197 err = -ENOMEM;
2198 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2199 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2200
2201 if (!ip6n->fb_tnl_dev)
2202 goto err_alloc_dev;
2203 dev_net_set(ip6n->fb_tnl_dev, net);
2204 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2205 /* FB netdevice is special: we have one, and only one per netns.
2206 * Allowing to move it to another netns is clearly unsafe.
2207 */
2208 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2209
2210 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2211 if (err < 0)
2212 goto err_register;
2213
2214 err = register_netdev(ip6n->fb_tnl_dev);
2215 if (err < 0)
2216 goto err_register;
2217
2218 t = netdev_priv(ip6n->fb_tnl_dev);
2219
2220 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2221 return 0;
2222
2223 err_register:
2224 free_netdev(ip6n->fb_tnl_dev);
2225 err_alloc_dev:
2226 return err;
2227 }
2228
2229 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2230 {
2231 struct net *net;
2232 LIST_HEAD(list);
2233
2234 rtnl_lock();
2235 list_for_each_entry(net, net_list, exit_list)
2236 ip6_tnl_destroy_tunnels(net, &list);
2237 unregister_netdevice_many(&list);
2238 rtnl_unlock();
2239 }
2240
2241 static struct pernet_operations ip6_tnl_net_ops = {
2242 .init = ip6_tnl_init_net,
2243 .exit_batch = ip6_tnl_exit_batch_net,
2244 .id = &ip6_tnl_net_id,
2245 .size = sizeof(struct ip6_tnl_net),
2246 };
2247
2248 /**
2249 * ip6_tunnel_init - register protocol and reserve needed resources
2250 *
2251 * Return: 0 on success
2252 **/
2253
2254 static int __init ip6_tunnel_init(void)
2255 {
2256 int err;
2257
2258 if (!ipv6_mod_enabled())
2259 return -EOPNOTSUPP;
2260
2261 err = register_pernet_device(&ip6_tnl_net_ops);
2262 if (err < 0)
2263 goto out_pernet;
2264
2265 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2266 if (err < 0) {
2267 pr_err("%s: can't register ip4ip6\n", __func__);
2268 goto out_ip4ip6;
2269 }
2270
2271 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2272 if (err < 0) {
2273 pr_err("%s: can't register ip6ip6\n", __func__);
2274 goto out_ip6ip6;
2275 }
2276 err = rtnl_link_register(&ip6_link_ops);
2277 if (err < 0)
2278 goto rtnl_link_failed;
2279
2280 return 0;
2281
2282 rtnl_link_failed:
2283 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2284 out_ip6ip6:
2285 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2286 out_ip4ip6:
2287 unregister_pernet_device(&ip6_tnl_net_ops);
2288 out_pernet:
2289 return err;
2290 }
2291
2292 /**
2293 * ip6_tunnel_cleanup - free resources and unregister protocol
2294 **/
2295
2296 static void __exit ip6_tunnel_cleanup(void)
2297 {
2298 rtnl_link_unregister(&ip6_link_ops);
2299 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2300 pr_info("%s: can't deregister ip4ip6\n", __func__);
2301
2302 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2303 pr_info("%s: can't deregister ip6ip6\n", __func__);
2304
2305 unregister_pernet_device(&ip6_tnl_net_ops);
2306 }
2307
2308 module_init(ip6_tunnel_init);
2309 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support