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[mirror_ubuntu-artful-kernel.git] / net / ipv6 / ip6_tunnel.c
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)
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 free_netdev(dev);
258 }
259
260 static int ip6_tnl_create2(struct net_device *dev)
261 {
262 struct ip6_tnl *t = netdev_priv(dev);
263 struct net *net = dev_net(dev);
264 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
265 int err;
266
267 t = netdev_priv(dev);
268
269 dev->rtnl_link_ops = &ip6_link_ops;
270 err = register_netdevice(dev);
271 if (err < 0)
272 goto out;
273
274 strcpy(t->parms.name, dev->name);
275
276 dev_hold(dev);
277 ip6_tnl_link(ip6n, t);
278 return 0;
279
280 out:
281 return err;
282 }
283
284 /**
285 * ip6_tnl_create - create a new tunnel
286 * @p: tunnel parameters
287 * @pt: pointer to new tunnel
288 *
289 * Description:
290 * Create tunnel matching given parameters.
291 *
292 * Return:
293 * created tunnel or error pointer
294 **/
295
296 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
297 {
298 struct net_device *dev;
299 struct ip6_tnl *t;
300 char name[IFNAMSIZ];
301 int err = -ENOMEM;
302
303 if (p->name[0])
304 strlcpy(name, p->name, IFNAMSIZ);
305 else
306 sprintf(name, "ip6tnl%%d");
307
308 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
309 ip6_tnl_dev_setup);
310 if (!dev)
311 goto failed;
312
313 dev_net_set(dev, net);
314
315 t = netdev_priv(dev);
316 t->parms = *p;
317 t->net = dev_net(dev);
318 err = ip6_tnl_create2(dev);
319 if (err < 0)
320 goto failed_free;
321
322 return t;
323
324 failed_free:
325 ip6_dev_free(dev);
326 failed:
327 return ERR_PTR(err);
328 }
329
330 /**
331 * ip6_tnl_locate - find or create tunnel matching given parameters
332 * @p: tunnel parameters
333 * @create: != 0 if allowed to create new tunnel if no match found
334 *
335 * Description:
336 * ip6_tnl_locate() first tries to locate an existing tunnel
337 * based on @parms. If this is unsuccessful, but @create is set a new
338 * tunnel device is created and registered for use.
339 *
340 * Return:
341 * matching tunnel or error pointer
342 **/
343
344 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
345 struct __ip6_tnl_parm *p, int create)
346 {
347 const struct in6_addr *remote = &p->raddr;
348 const struct in6_addr *local = &p->laddr;
349 struct ip6_tnl __rcu **tp;
350 struct ip6_tnl *t;
351 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
352
353 for (tp = ip6_tnl_bucket(ip6n, p);
354 (t = rtnl_dereference(*tp)) != NULL;
355 tp = &t->next) {
356 if (ipv6_addr_equal(local, &t->parms.laddr) &&
357 ipv6_addr_equal(remote, &t->parms.raddr)) {
358 if (create)
359 return ERR_PTR(-EEXIST);
360
361 return t;
362 }
363 }
364 if (!create)
365 return ERR_PTR(-ENODEV);
366 return ip6_tnl_create(net, p);
367 }
368
369 /**
370 * ip6_tnl_dev_uninit - tunnel device uninitializer
371 * @dev: the device to be destroyed
372 *
373 * Description:
374 * ip6_tnl_dev_uninit() removes tunnel from its list
375 **/
376
377 static void
378 ip6_tnl_dev_uninit(struct net_device *dev)
379 {
380 struct ip6_tnl *t = netdev_priv(dev);
381 struct net *net = t->net;
382 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
383
384 if (dev == ip6n->fb_tnl_dev)
385 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
386 else
387 ip6_tnl_unlink(ip6n, t);
388 dst_cache_reset(&t->dst_cache);
389 dev_put(dev);
390 }
391
392 /**
393 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
394 * @skb: received socket buffer
395 *
396 * Return:
397 * 0 if none was found,
398 * else index to encapsulation limit
399 **/
400
401 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
402 {
403 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
404 unsigned int nhoff = raw - skb->data;
405 unsigned int off = nhoff + sizeof(*ipv6h);
406 u8 next, nexthdr = ipv6h->nexthdr;
407
408 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
409 struct ipv6_opt_hdr *hdr;
410 u16 optlen;
411
412 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
413 break;
414
415 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
416 if (nexthdr == NEXTHDR_FRAGMENT) {
417 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
418 if (frag_hdr->frag_off)
419 break;
420 optlen = 8;
421 } else if (nexthdr == NEXTHDR_AUTH) {
422 optlen = (hdr->hdrlen + 2) << 2;
423 } else {
424 optlen = ipv6_optlen(hdr);
425 }
426 /* cache hdr->nexthdr, since pskb_may_pull() might
427 * invalidate hdr
428 */
429 next = hdr->nexthdr;
430 if (nexthdr == NEXTHDR_DEST) {
431 u16 i = 2;
432
433 /* Remember : hdr is no longer valid at this point. */
434 if (!pskb_may_pull(skb, off + optlen))
435 break;
436
437 while (1) {
438 struct ipv6_tlv_tnl_enc_lim *tel;
439
440 /* No more room for encapsulation limit */
441 if (i + sizeof(*tel) > optlen)
442 break;
443
444 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
445 /* return index of option if found and valid */
446 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
447 tel->length == 1)
448 return i + off - nhoff;
449 /* else jump to next option */
450 if (tel->type)
451 i += tel->length + 2;
452 else
453 i++;
454 }
455 }
456 nexthdr = next;
457 off += optlen;
458 }
459 return 0;
460 }
461 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
462
463 /**
464 * ip6_tnl_err - tunnel error handler
465 *
466 * Description:
467 * ip6_tnl_err() should handle errors in the tunnel according
468 * to the specifications in RFC 2473.
469 **/
470
471 static int
472 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
473 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
474 {
475 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data;
476 struct ip6_tnl *t;
477 int rel_msg = 0;
478 u8 rel_type = ICMPV6_DEST_UNREACH;
479 u8 rel_code = ICMPV6_ADDR_UNREACH;
480 u8 tproto;
481 __u32 rel_info = 0;
482 __u16 len;
483 int err = -ENOENT;
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 = ACCESS_ONCE(t->parms.proto);
495 if (tproto != ipproto && tproto != 0)
496 goto out;
497
498 err = 0;
499
500 switch (*type) {
501 __u32 teli;
502 struct ipv6_tlv_tnl_enc_lim *tel;
503 __u32 mtu;
504 case ICMPV6_DEST_UNREACH:
505 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
506 t->parms.name);
507 rel_msg = 1;
508 break;
509 case ICMPV6_TIME_EXCEED:
510 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
511 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
512 t->parms.name);
513 rel_msg = 1;
514 }
515 break;
516 case ICMPV6_PARAMPROB:
517 teli = 0;
518 if ((*code) == ICMPV6_HDR_FIELD)
519 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
520
521 if (teli && teli == *info - 2) {
522 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
523 if (tel->encap_limit == 0) {
524 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
525 t->parms.name);
526 rel_msg = 1;
527 }
528 } else {
529 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
530 t->parms.name);
531 }
532 break;
533 case ICMPV6_PKT_TOOBIG:
534 mtu = *info - offset;
535 if (mtu < IPV6_MIN_MTU)
536 mtu = IPV6_MIN_MTU;
537 t->dev->mtu = mtu;
538
539 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
540 if (len > mtu) {
541 rel_type = ICMPV6_PKT_TOOBIG;
542 rel_code = 0;
543 rel_info = mtu;
544 rel_msg = 1;
545 }
546 break;
547 }
548
549 *type = rel_type;
550 *code = rel_code;
551 *info = rel_info;
552 *msg = rel_msg;
553
554 out:
555 rcu_read_unlock();
556 return err;
557 }
558
559 static int
560 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
561 u8 type, u8 code, int offset, __be32 info)
562 {
563 int rel_msg = 0;
564 u8 rel_type = type;
565 u8 rel_code = code;
566 __u32 rel_info = ntohl(info);
567 int err;
568 struct sk_buff *skb2;
569 const struct iphdr *eiph;
570 struct rtable *rt;
571 struct flowi4 fl4;
572
573 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
574 &rel_msg, &rel_info, offset);
575 if (err < 0)
576 return err;
577
578 if (rel_msg == 0)
579 return 0;
580
581 switch (rel_type) {
582 case ICMPV6_DEST_UNREACH:
583 if (rel_code != ICMPV6_ADDR_UNREACH)
584 return 0;
585 rel_type = ICMP_DEST_UNREACH;
586 rel_code = ICMP_HOST_UNREACH;
587 break;
588 case ICMPV6_PKT_TOOBIG:
589 if (rel_code != 0)
590 return 0;
591 rel_type = ICMP_DEST_UNREACH;
592 rel_code = ICMP_FRAG_NEEDED;
593 break;
594 case NDISC_REDIRECT:
595 rel_type = ICMP_REDIRECT;
596 rel_code = ICMP_REDIR_HOST;
597 default:
598 return 0;
599 }
600
601 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
602 return 0;
603
604 skb2 = skb_clone(skb, GFP_ATOMIC);
605 if (!skb2)
606 return 0;
607
608 skb_dst_drop(skb2);
609
610 skb_pull(skb2, offset);
611 skb_reset_network_header(skb2);
612 eiph = ip_hdr(skb2);
613
614 /* Try to guess incoming interface */
615 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
616 eiph->saddr, 0,
617 0, 0,
618 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
619 if (IS_ERR(rt))
620 goto out;
621
622 skb2->dev = rt->dst.dev;
623
624 /* route "incoming" packet */
625 if (rt->rt_flags & RTCF_LOCAL) {
626 ip_rt_put(rt);
627 rt = NULL;
628 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
629 eiph->daddr, eiph->saddr,
630 0, 0,
631 IPPROTO_IPIP,
632 RT_TOS(eiph->tos), 0);
633 if (IS_ERR(rt) ||
634 rt->dst.dev->type != ARPHRD_TUNNEL) {
635 if (!IS_ERR(rt))
636 ip_rt_put(rt);
637 goto out;
638 }
639 skb_dst_set(skb2, &rt->dst);
640 } else {
641 ip_rt_put(rt);
642 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
643 skb2->dev) ||
644 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
645 goto out;
646 }
647
648 /* change mtu on this route */
649 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
650 if (rel_info > dst_mtu(skb_dst(skb2)))
651 goto out;
652
653 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info);
654 }
655 if (rel_type == ICMP_REDIRECT)
656 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2);
657
658 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
659
660 out:
661 kfree_skb(skb2);
662 return 0;
663 }
664
665 static int
666 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
667 u8 type, u8 code, int offset, __be32 info)
668 {
669 int rel_msg = 0;
670 u8 rel_type = type;
671 u8 rel_code = code;
672 __u32 rel_info = ntohl(info);
673 int err;
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 skb_dst_drop(skb2);
688 skb_pull(skb2, offset);
689 skb_reset_network_header(skb2);
690
691 /* Try to guess incoming interface */
692 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
693 NULL, 0, 0);
694
695 if (rt && rt->dst.dev)
696 skb2->dev = rt->dst.dev;
697
698 icmpv6_send(skb2, rel_type, rel_code, rel_info);
699
700 ip6_rt_put(rt);
701
702 kfree_skb(skb2);
703 }
704
705 return 0;
706 }
707
708 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
709 const struct ipv6hdr *ipv6h,
710 struct sk_buff *skb)
711 {
712 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
713
714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
715 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
716
717 return IP6_ECN_decapsulate(ipv6h, skb);
718 }
719
720 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
721 const struct ipv6hdr *ipv6h,
722 struct sk_buff *skb)
723 {
724 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
725 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
726
727 return IP6_ECN_decapsulate(ipv6h, skb);
728 }
729
730 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
731 const struct in6_addr *laddr,
732 const struct in6_addr *raddr)
733 {
734 struct __ip6_tnl_parm *p = &t->parms;
735 int ltype = ipv6_addr_type(laddr);
736 int rtype = ipv6_addr_type(raddr);
737 __u32 flags = 0;
738
739 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
740 flags = IP6_TNL_F_CAP_PER_PACKET;
741 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
742 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
743 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
744 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
745 if (ltype&IPV6_ADDR_UNICAST)
746 flags |= IP6_TNL_F_CAP_XMIT;
747 if (rtype&IPV6_ADDR_UNICAST)
748 flags |= IP6_TNL_F_CAP_RCV;
749 }
750 return flags;
751 }
752 EXPORT_SYMBOL(ip6_tnl_get_cap);
753
754 /* called with rcu_read_lock() */
755 int ip6_tnl_rcv_ctl(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 ret = 0;
761 struct net *net = t->net;
762
763 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
764 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
765 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
766 struct net_device *ldev = NULL;
767
768 if (p->link)
769 ldev = dev_get_by_index_rcu(net, p->link);
770
771 if ((ipv6_addr_is_multicast(laddr) ||
772 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
773 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))
774 ret = 1;
775 }
776 return ret;
777 }
778 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
779
780 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
781 const struct tnl_ptk_info *tpi,
782 struct metadata_dst *tun_dst,
783 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
784 const struct ipv6hdr *ipv6h,
785 struct sk_buff *skb),
786 bool log_ecn_err)
787 {
788 struct pcpu_sw_netstats *tstats;
789 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
790 int err;
791
792 if ((!(tpi->flags & TUNNEL_CSUM) &&
793 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
794 ((tpi->flags & TUNNEL_CSUM) &&
795 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
796 tunnel->dev->stats.rx_crc_errors++;
797 tunnel->dev->stats.rx_errors++;
798 goto drop;
799 }
800
801 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
802 if (!(tpi->flags & TUNNEL_SEQ) ||
803 (tunnel->i_seqno &&
804 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
805 tunnel->dev->stats.rx_fifo_errors++;
806 tunnel->dev->stats.rx_errors++;
807 goto drop;
808 }
809 tunnel->i_seqno = ntohl(tpi->seq) + 1;
810 }
811
812 skb->protocol = tpi->proto;
813
814 /* Warning: All skb pointers will be invalidated! */
815 if (tunnel->dev->type == ARPHRD_ETHER) {
816 if (!pskb_may_pull(skb, ETH_HLEN)) {
817 tunnel->dev->stats.rx_length_errors++;
818 tunnel->dev->stats.rx_errors++;
819 goto drop;
820 }
821
822 ipv6h = ipv6_hdr(skb);
823 skb->protocol = eth_type_trans(skb, tunnel->dev);
824 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
825 } else {
826 skb->dev = tunnel->dev;
827 }
828
829 skb_reset_network_header(skb);
830 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
831
832 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
833
834 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
835 if (unlikely(err)) {
836 if (log_ecn_err)
837 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
838 &ipv6h->saddr,
839 ipv6_get_dsfield(ipv6h));
840 if (err > 1) {
841 ++tunnel->dev->stats.rx_frame_errors;
842 ++tunnel->dev->stats.rx_errors;
843 goto drop;
844 }
845 }
846
847 tstats = this_cpu_ptr(tunnel->dev->tstats);
848 u64_stats_update_begin(&tstats->syncp);
849 tstats->rx_packets++;
850 tstats->rx_bytes += skb->len;
851 u64_stats_update_end(&tstats->syncp);
852
853 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
854
855 if (tun_dst)
856 skb_dst_set(skb, (struct dst_entry *)tun_dst);
857
858 gro_cells_receive(&tunnel->gro_cells, skb);
859 return 0;
860
861 drop:
862 kfree_skb(skb);
863 return 0;
864 }
865
866 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
867 const struct tnl_ptk_info *tpi,
868 struct metadata_dst *tun_dst,
869 bool log_ecn_err)
870 {
871 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
872 log_ecn_err);
873 }
874 EXPORT_SYMBOL(ip6_tnl_rcv);
875
876 static const struct tnl_ptk_info tpi_v6 = {
877 /* no tunnel info required for ipxip6. */
878 .proto = htons(ETH_P_IPV6),
879 };
880
881 static const struct tnl_ptk_info tpi_v4 = {
882 /* no tunnel info required for ipxip6. */
883 .proto = htons(ETH_P_IP),
884 };
885
886 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
887 const struct tnl_ptk_info *tpi,
888 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
889 const struct ipv6hdr *ipv6h,
890 struct sk_buff *skb))
891 {
892 struct ip6_tnl *t;
893 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
894 struct metadata_dst *tun_dst = NULL;
895 int ret = -1;
896
897 rcu_read_lock();
898 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
899
900 if (t) {
901 u8 tproto = ACCESS_ONCE(t->parms.proto);
902
903 if (tproto != ipproto && tproto != 0)
904 goto drop;
905 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
906 goto drop;
907 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
908 goto drop;
909 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
910 goto drop;
911 if (t->parms.collect_md) {
912 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
913 if (!tun_dst)
914 return 0;
915 }
916 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
917 log_ecn_error);
918 }
919
920 rcu_read_unlock();
921
922 return ret;
923
924 drop:
925 rcu_read_unlock();
926 kfree_skb(skb);
927 return 0;
928 }
929
930 static int ip4ip6_rcv(struct sk_buff *skb)
931 {
932 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
933 ip4ip6_dscp_ecn_decapsulate);
934 }
935
936 static int ip6ip6_rcv(struct sk_buff *skb)
937 {
938 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
939 ip6ip6_dscp_ecn_decapsulate);
940 }
941
942 struct ipv6_tel_txoption {
943 struct ipv6_txoptions ops;
944 __u8 dst_opt[8];
945 };
946
947 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
948 {
949 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
950
951 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
952 opt->dst_opt[3] = 1;
953 opt->dst_opt[4] = encap_limit;
954 opt->dst_opt[5] = IPV6_TLV_PADN;
955 opt->dst_opt[6] = 1;
956
957 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
958 opt->ops.opt_nflen = 8;
959 }
960
961 /**
962 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
963 * @t: the outgoing tunnel device
964 * @hdr: IPv6 header from the incoming packet
965 *
966 * Description:
967 * Avoid trivial tunneling loop by checking that tunnel exit-point
968 * doesn't match source of incoming packet.
969 *
970 * Return:
971 * 1 if conflict,
972 * 0 else
973 **/
974
975 static inline bool
976 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
977 {
978 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
979 }
980
981 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
982 const struct in6_addr *laddr,
983 const struct in6_addr *raddr)
984 {
985 struct __ip6_tnl_parm *p = &t->parms;
986 int ret = 0;
987 struct net *net = t->net;
988
989 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
990 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
991 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
992 struct net_device *ldev = NULL;
993
994 rcu_read_lock();
995 if (p->link)
996 ldev = dev_get_by_index_rcu(net, p->link);
997
998 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
999 pr_warn("%s xmit: Local address not yet configured!\n",
1000 p->name);
1001 else if (!ipv6_addr_is_multicast(raddr) &&
1002 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
1003 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1004 p->name);
1005 else
1006 ret = 1;
1007 rcu_read_unlock();
1008 }
1009 return ret;
1010 }
1011 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1012
1013 /**
1014 * ip6_tnl_xmit - encapsulate packet and send
1015 * @skb: the outgoing socket buffer
1016 * @dev: the outgoing tunnel device
1017 * @dsfield: dscp code for outer header
1018 * @fl6: flow of tunneled packet
1019 * @encap_limit: encapsulation limit
1020 * @pmtu: Path MTU is stored if packet is too big
1021 * @proto: next header value
1022 *
1023 * Description:
1024 * Build new header and do some sanity checks on the packet before sending
1025 * it.
1026 *
1027 * Return:
1028 * 0 on success
1029 * -1 fail
1030 * %-EMSGSIZE message too big. return mtu in this case.
1031 **/
1032
1033 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1034 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1035 __u8 proto)
1036 {
1037 struct ip6_tnl *t = netdev_priv(dev);
1038 struct net *net = t->net;
1039 struct net_device_stats *stats = &t->dev->stats;
1040 struct ipv6hdr *ipv6h;
1041 struct ipv6_tel_txoption opt;
1042 struct dst_entry *dst = NULL, *ndst = NULL;
1043 struct net_device *tdev;
1044 int mtu;
1045 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1046 unsigned int max_headroom = psh_hlen;
1047 bool use_cache = false;
1048 u8 hop_limit;
1049 int err = -1;
1050
1051 if (t->parms.collect_md) {
1052 hop_limit = skb_tunnel_info(skb)->key.ttl;
1053 goto route_lookup;
1054 } else {
1055 hop_limit = t->parms.hop_limit;
1056 }
1057
1058 /* NBMA tunnel */
1059 if (ipv6_addr_any(&t->parms.raddr)) {
1060 if (skb->protocol == htons(ETH_P_IPV6)) {
1061 struct in6_addr *addr6;
1062 struct neighbour *neigh;
1063 int addr_type;
1064
1065 if (!skb_dst(skb))
1066 goto tx_err_link_failure;
1067
1068 neigh = dst_neigh_lookup(skb_dst(skb),
1069 &ipv6_hdr(skb)->daddr);
1070 if (!neigh)
1071 goto tx_err_link_failure;
1072
1073 addr6 = (struct in6_addr *)&neigh->primary_key;
1074 addr_type = ipv6_addr_type(addr6);
1075
1076 if (addr_type == IPV6_ADDR_ANY)
1077 addr6 = &ipv6_hdr(skb)->daddr;
1078
1079 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1080 neigh_release(neigh);
1081 }
1082 } else if (!(t->parms.flags &
1083 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) {
1084 /* enable the cache only only if the routing decision does
1085 * not depend on the current inner header value
1086 */
1087 use_cache = true;
1088 }
1089
1090 if (use_cache)
1091 dst = dst_cache_get(&t->dst_cache);
1092
1093 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1094 goto tx_err_link_failure;
1095
1096 if (!dst) {
1097 route_lookup:
1098 dst = ip6_route_output(net, NULL, fl6);
1099
1100 if (dst->error)
1101 goto tx_err_link_failure;
1102 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1103 if (IS_ERR(dst)) {
1104 err = PTR_ERR(dst);
1105 dst = NULL;
1106 goto tx_err_link_failure;
1107 }
1108 if (t->parms.collect_md &&
1109 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1110 &fl6->daddr, 0, &fl6->saddr))
1111 goto tx_err_link_failure;
1112 ndst = dst;
1113 }
1114
1115 tdev = dst->dev;
1116
1117 if (tdev == dev) {
1118 stats->collisions++;
1119 net_warn_ratelimited("%s: Local routing loop detected!\n",
1120 t->parms.name);
1121 goto tx_err_dst_release;
1122 }
1123 mtu = dst_mtu(dst) - psh_hlen - t->tun_hlen;
1124 if (encap_limit >= 0) {
1125 max_headroom += 8;
1126 mtu -= 8;
1127 }
1128 if (mtu < IPV6_MIN_MTU)
1129 mtu = IPV6_MIN_MTU;
1130 if (skb_dst(skb) && !t->parms.collect_md)
1131 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1132 if (skb->len - t->tun_hlen > mtu && !skb_is_gso(skb)) {
1133 *pmtu = mtu;
1134 err = -EMSGSIZE;
1135 goto tx_err_dst_release;
1136 }
1137
1138 if (t->err_count > 0) {
1139 if (time_before(jiffies,
1140 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1141 t->err_count--;
1142
1143 dst_link_failure(skb);
1144 } else {
1145 t->err_count = 0;
1146 }
1147 }
1148
1149 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1150
1151 /*
1152 * Okay, now see if we can stuff it in the buffer as-is.
1153 */
1154 max_headroom += LL_RESERVED_SPACE(tdev);
1155
1156 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1157 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1158 struct sk_buff *new_skb;
1159
1160 new_skb = skb_realloc_headroom(skb, max_headroom);
1161 if (!new_skb)
1162 goto tx_err_dst_release;
1163
1164 if (skb->sk)
1165 skb_set_owner_w(new_skb, skb->sk);
1166 consume_skb(skb);
1167 skb = new_skb;
1168 }
1169
1170 if (t->parms.collect_md) {
1171 if (t->encap.type != TUNNEL_ENCAP_NONE)
1172 goto tx_err_dst_release;
1173 } else {
1174 if (use_cache && ndst)
1175 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1176 }
1177 skb_dst_set(skb, dst);
1178
1179 if (encap_limit >= 0) {
1180 init_tel_txopt(&opt, encap_limit);
1181 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1182 }
1183
1184 /* Calculate max headroom for all the headers and adjust
1185 * needed_headroom if necessary.
1186 */
1187 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1188 + dst->header_len + t->hlen;
1189 if (max_headroom > dev->needed_headroom)
1190 dev->needed_headroom = max_headroom;
1191
1192 err = ip6_tnl_encap(skb, t, &proto, fl6);
1193 if (err)
1194 return err;
1195
1196 skb_push(skb, sizeof(struct ipv6hdr));
1197 skb_reset_network_header(skb);
1198 ipv6h = ipv6_hdr(skb);
1199 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
1200 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1201 ipv6h->hop_limit = hop_limit;
1202 ipv6h->nexthdr = proto;
1203 ipv6h->saddr = fl6->saddr;
1204 ipv6h->daddr = fl6->daddr;
1205 ip6tunnel_xmit(NULL, skb, dev);
1206 return 0;
1207 tx_err_link_failure:
1208 stats->tx_carrier_errors++;
1209 dst_link_failure(skb);
1210 tx_err_dst_release:
1211 dst_release(dst);
1212 return err;
1213 }
1214 EXPORT_SYMBOL(ip6_tnl_xmit);
1215
1216 static inline int
1217 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1218 {
1219 struct ip6_tnl *t = netdev_priv(dev);
1220 const struct iphdr *iph = ip_hdr(skb);
1221 int encap_limit = -1;
1222 struct flowi6 fl6;
1223 __u8 dsfield;
1224 __u32 mtu;
1225 u8 tproto;
1226 int err;
1227
1228 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1229
1230 tproto = ACCESS_ONCE(t->parms.proto);
1231 if (tproto != IPPROTO_IPIP && tproto != 0)
1232 return -1;
1233
1234 dsfield = ipv4_get_dsfield(iph);
1235
1236 if (t->parms.collect_md) {
1237 struct ip_tunnel_info *tun_info;
1238 const struct ip_tunnel_key *key;
1239
1240 tun_info = skb_tunnel_info(skb);
1241 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1242 ip_tunnel_info_af(tun_info) != AF_INET6))
1243 return -1;
1244 key = &tun_info->key;
1245 memset(&fl6, 0, sizeof(fl6));
1246 fl6.flowi6_proto = IPPROTO_IPIP;
1247 fl6.daddr = key->u.ipv6.dst;
1248 fl6.flowlabel = key->label;
1249 } else {
1250 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1251 encap_limit = t->parms.encap_limit;
1252
1253 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1254 fl6.flowi6_proto = IPPROTO_IPIP;
1255
1256 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1257 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
1258 & IPV6_TCLASS_MASK;
1259 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1260 fl6.flowi6_mark = skb->mark;
1261 else
1262 fl6.flowi6_mark = t->parms.fwmark;
1263 }
1264
1265 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1266
1267 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1268 return -1;
1269
1270 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1271
1272 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1273 IPPROTO_IPIP);
1274 if (err != 0) {
1275 /* XXX: send ICMP error even if DF is not set. */
1276 if (err == -EMSGSIZE)
1277 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1278 htonl(mtu));
1279 return -1;
1280 }
1281
1282 return 0;
1283 }
1284
1285 static inline int
1286 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1287 {
1288 struct ip6_tnl *t = netdev_priv(dev);
1289 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1290 int encap_limit = -1;
1291 __u16 offset;
1292 struct flowi6 fl6;
1293 __u8 dsfield;
1294 __u32 mtu;
1295 u8 tproto;
1296 int err;
1297
1298 tproto = ACCESS_ONCE(t->parms.proto);
1299 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1300 ip6_tnl_addr_conflict(t, ipv6h))
1301 return -1;
1302
1303 dsfield = ipv6_get_dsfield(ipv6h);
1304
1305 if (t->parms.collect_md) {
1306 struct ip_tunnel_info *tun_info;
1307 const struct ip_tunnel_key *key;
1308
1309 tun_info = skb_tunnel_info(skb);
1310 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1311 ip_tunnel_info_af(tun_info) != AF_INET6))
1312 return -1;
1313 key = &tun_info->key;
1314 memset(&fl6, 0, sizeof(fl6));
1315 fl6.flowi6_proto = IPPROTO_IPV6;
1316 fl6.daddr = key->u.ipv6.dst;
1317 fl6.flowlabel = key->label;
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 fl6.flowlabel |= (*(__be32 *)ipv6h & IPV6_TCLASS_MASK);
1341 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1342 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1343 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1344 fl6.flowi6_mark = skb->mark;
1345 else
1346 fl6.flowi6_mark = t->parms.fwmark;
1347 }
1348
1349 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1350
1351 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1352 return -1;
1353
1354 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1355
1356 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1357 IPPROTO_IPV6);
1358 if (err != 0) {
1359 if (err == -EMSGSIZE)
1360 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1361 return -1;
1362 }
1363
1364 return 0;
1365 }
1366
1367 static netdev_tx_t
1368 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1369 {
1370 struct ip6_tnl *t = netdev_priv(dev);
1371 struct net_device_stats *stats = &t->dev->stats;
1372 int ret;
1373
1374 switch (skb->protocol) {
1375 case htons(ETH_P_IP):
1376 ret = ip4ip6_tnl_xmit(skb, dev);
1377 break;
1378 case htons(ETH_P_IPV6):
1379 ret = ip6ip6_tnl_xmit(skb, dev);
1380 break;
1381 default:
1382 goto tx_err;
1383 }
1384
1385 if (ret < 0)
1386 goto tx_err;
1387
1388 return NETDEV_TX_OK;
1389
1390 tx_err:
1391 stats->tx_errors++;
1392 stats->tx_dropped++;
1393 kfree_skb(skb);
1394 return NETDEV_TX_OK;
1395 }
1396
1397 static void ip6_tnl_link_config(struct ip6_tnl *t)
1398 {
1399 struct net_device *dev = t->dev;
1400 struct __ip6_tnl_parm *p = &t->parms;
1401 struct flowi6 *fl6 = &t->fl.u.ip6;
1402 int t_hlen;
1403
1404 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1405 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1406
1407 /* Set up flowi template */
1408 fl6->saddr = p->laddr;
1409 fl6->daddr = p->raddr;
1410 fl6->flowi6_oif = p->link;
1411 fl6->flowlabel = 0;
1412
1413 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1414 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1415 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1416 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1417
1418 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1419 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1420
1421 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1422 dev->flags |= IFF_POINTOPOINT;
1423 else
1424 dev->flags &= ~IFF_POINTOPOINT;
1425
1426 t->tun_hlen = 0;
1427 t->hlen = t->encap_hlen + t->tun_hlen;
1428 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1429
1430 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1431 int strict = (ipv6_addr_type(&p->raddr) &
1432 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1433
1434 struct rt6_info *rt = rt6_lookup(t->net,
1435 &p->raddr, &p->laddr,
1436 p->link, strict);
1437
1438 if (!rt)
1439 return;
1440
1441 if (rt->dst.dev) {
1442 dev->hard_header_len = rt->dst.dev->hard_header_len +
1443 t_hlen;
1444
1445 dev->mtu = rt->dst.dev->mtu - t_hlen;
1446 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1447 dev->mtu -= 8;
1448
1449 if (dev->mtu < IPV6_MIN_MTU)
1450 dev->mtu = IPV6_MIN_MTU;
1451 }
1452 ip6_rt_put(rt);
1453 }
1454 }
1455
1456 /**
1457 * ip6_tnl_change - update the tunnel parameters
1458 * @t: tunnel to be changed
1459 * @p: tunnel configuration parameters
1460 *
1461 * Description:
1462 * ip6_tnl_change() updates the tunnel parameters
1463 **/
1464
1465 static int
1466 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1467 {
1468 t->parms.laddr = p->laddr;
1469 t->parms.raddr = p->raddr;
1470 t->parms.flags = p->flags;
1471 t->parms.hop_limit = p->hop_limit;
1472 t->parms.encap_limit = p->encap_limit;
1473 t->parms.flowinfo = p->flowinfo;
1474 t->parms.link = p->link;
1475 t->parms.proto = p->proto;
1476 t->parms.fwmark = p->fwmark;
1477 dst_cache_reset(&t->dst_cache);
1478 ip6_tnl_link_config(t);
1479 return 0;
1480 }
1481
1482 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1483 {
1484 struct net *net = t->net;
1485 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1486 int err;
1487
1488 ip6_tnl_unlink(ip6n, t);
1489 synchronize_net();
1490 err = ip6_tnl_change(t, p);
1491 ip6_tnl_link(ip6n, t);
1492 netdev_state_change(t->dev);
1493 return err;
1494 }
1495
1496 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1497 {
1498 /* for default tnl0 device allow to change only the proto */
1499 t->parms.proto = p->proto;
1500 netdev_state_change(t->dev);
1501 return 0;
1502 }
1503
1504 static void
1505 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1506 {
1507 p->laddr = u->laddr;
1508 p->raddr = u->raddr;
1509 p->flags = u->flags;
1510 p->hop_limit = u->hop_limit;
1511 p->encap_limit = u->encap_limit;
1512 p->flowinfo = u->flowinfo;
1513 p->link = u->link;
1514 p->proto = u->proto;
1515 memcpy(p->name, u->name, sizeof(u->name));
1516 }
1517
1518 static void
1519 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1520 {
1521 u->laddr = p->laddr;
1522 u->raddr = p->raddr;
1523 u->flags = p->flags;
1524 u->hop_limit = p->hop_limit;
1525 u->encap_limit = p->encap_limit;
1526 u->flowinfo = p->flowinfo;
1527 u->link = p->link;
1528 u->proto = p->proto;
1529 memcpy(u->name, p->name, sizeof(u->name));
1530 }
1531
1532 /**
1533 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1534 * @dev: virtual device associated with tunnel
1535 * @ifr: parameters passed from userspace
1536 * @cmd: command to be performed
1537 *
1538 * Description:
1539 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1540 * from userspace.
1541 *
1542 * The possible commands are the following:
1543 * %SIOCGETTUNNEL: get tunnel parameters for device
1544 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1545 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1546 * %SIOCDELTUNNEL: delete tunnel
1547 *
1548 * The fallback device "ip6tnl0", created during module
1549 * initialization, can be used for creating other tunnel devices.
1550 *
1551 * Return:
1552 * 0 on success,
1553 * %-EFAULT if unable to copy data to or from userspace,
1554 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1555 * %-EINVAL if passed tunnel parameters are invalid,
1556 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1557 * %-ENODEV if attempting to change or delete a nonexisting device
1558 **/
1559
1560 static int
1561 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1562 {
1563 int err = 0;
1564 struct ip6_tnl_parm p;
1565 struct __ip6_tnl_parm p1;
1566 struct ip6_tnl *t = netdev_priv(dev);
1567 struct net *net = t->net;
1568 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1569
1570 memset(&p1, 0, sizeof(p1));
1571
1572 switch (cmd) {
1573 case SIOCGETTUNNEL:
1574 if (dev == ip6n->fb_tnl_dev) {
1575 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1576 err = -EFAULT;
1577 break;
1578 }
1579 ip6_tnl_parm_from_user(&p1, &p);
1580 t = ip6_tnl_locate(net, &p1, 0);
1581 if (IS_ERR(t))
1582 t = netdev_priv(dev);
1583 } else {
1584 memset(&p, 0, sizeof(p));
1585 }
1586 ip6_tnl_parm_to_user(&p, &t->parms);
1587 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1588 err = -EFAULT;
1589 }
1590 break;
1591 case SIOCADDTUNNEL:
1592 case SIOCCHGTUNNEL:
1593 err = -EPERM;
1594 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1595 break;
1596 err = -EFAULT;
1597 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1598 break;
1599 err = -EINVAL;
1600 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1601 p.proto != 0)
1602 break;
1603 ip6_tnl_parm_from_user(&p1, &p);
1604 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1605 if (cmd == SIOCCHGTUNNEL) {
1606 if (!IS_ERR(t)) {
1607 if (t->dev != dev) {
1608 err = -EEXIST;
1609 break;
1610 }
1611 } else
1612 t = netdev_priv(dev);
1613 if (dev == ip6n->fb_tnl_dev)
1614 err = ip6_tnl0_update(t, &p1);
1615 else
1616 err = ip6_tnl_update(t, &p1);
1617 }
1618 if (!IS_ERR(t)) {
1619 err = 0;
1620 ip6_tnl_parm_to_user(&p, &t->parms);
1621 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1622 err = -EFAULT;
1623
1624 } else {
1625 err = PTR_ERR(t);
1626 }
1627 break;
1628 case SIOCDELTUNNEL:
1629 err = -EPERM;
1630 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1631 break;
1632
1633 if (dev == ip6n->fb_tnl_dev) {
1634 err = -EFAULT;
1635 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1636 break;
1637 err = -ENOENT;
1638 ip6_tnl_parm_from_user(&p1, &p);
1639 t = ip6_tnl_locate(net, &p1, 0);
1640 if (IS_ERR(t))
1641 break;
1642 err = -EPERM;
1643 if (t->dev == ip6n->fb_tnl_dev)
1644 break;
1645 dev = t->dev;
1646 }
1647 err = 0;
1648 unregister_netdevice(dev);
1649 break;
1650 default:
1651 err = -EINVAL;
1652 }
1653 return err;
1654 }
1655
1656 /**
1657 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1658 * @dev: virtual device associated with tunnel
1659 * @new_mtu: the new mtu
1660 *
1661 * Return:
1662 * 0 on success,
1663 * %-EINVAL if mtu too small
1664 **/
1665
1666 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1667 {
1668 struct ip6_tnl *tnl = netdev_priv(dev);
1669
1670 if (tnl->parms.proto == IPPROTO_IPIP) {
1671 if (new_mtu < ETH_MIN_MTU)
1672 return -EINVAL;
1673 } else {
1674 if (new_mtu < IPV6_MIN_MTU)
1675 return -EINVAL;
1676 }
1677 if (new_mtu > 0xFFF8 - dev->hard_header_len)
1678 return -EINVAL;
1679 dev->mtu = new_mtu;
1680 return 0;
1681 }
1682 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1683
1684 int ip6_tnl_get_iflink(const struct net_device *dev)
1685 {
1686 struct ip6_tnl *t = netdev_priv(dev);
1687
1688 return t->parms.link;
1689 }
1690 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1691
1692 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1693 unsigned int num)
1694 {
1695 if (num >= MAX_IPTUN_ENCAP_OPS)
1696 return -ERANGE;
1697
1698 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1699 &ip6tun_encaps[num],
1700 NULL, ops) ? 0 : -1;
1701 }
1702 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1703
1704 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1705 unsigned int num)
1706 {
1707 int ret;
1708
1709 if (num >= MAX_IPTUN_ENCAP_OPS)
1710 return -ERANGE;
1711
1712 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1713 &ip6tun_encaps[num],
1714 ops, NULL) == ops) ? 0 : -1;
1715
1716 synchronize_net();
1717
1718 return ret;
1719 }
1720 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1721
1722 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1723 struct ip_tunnel_encap *ipencap)
1724 {
1725 int hlen;
1726
1727 memset(&t->encap, 0, sizeof(t->encap));
1728
1729 hlen = ip6_encap_hlen(ipencap);
1730 if (hlen < 0)
1731 return hlen;
1732
1733 t->encap.type = ipencap->type;
1734 t->encap.sport = ipencap->sport;
1735 t->encap.dport = ipencap->dport;
1736 t->encap.flags = ipencap->flags;
1737
1738 t->encap_hlen = hlen;
1739 t->hlen = t->encap_hlen + t->tun_hlen;
1740
1741 return 0;
1742 }
1743 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1744
1745 static const struct net_device_ops ip6_tnl_netdev_ops = {
1746 .ndo_init = ip6_tnl_dev_init,
1747 .ndo_uninit = ip6_tnl_dev_uninit,
1748 .ndo_start_xmit = ip6_tnl_start_xmit,
1749 .ndo_do_ioctl = ip6_tnl_ioctl,
1750 .ndo_change_mtu = ip6_tnl_change_mtu,
1751 .ndo_get_stats = ip6_get_stats,
1752 .ndo_get_iflink = ip6_tnl_get_iflink,
1753 };
1754
1755 #define IPXIPX_FEATURES (NETIF_F_SG | \
1756 NETIF_F_FRAGLIST | \
1757 NETIF_F_HIGHDMA | \
1758 NETIF_F_GSO_SOFTWARE | \
1759 NETIF_F_HW_CSUM)
1760
1761 /**
1762 * ip6_tnl_dev_setup - setup virtual tunnel device
1763 * @dev: virtual device associated with tunnel
1764 *
1765 * Description:
1766 * Initialize function pointers and device parameters
1767 **/
1768
1769 static void ip6_tnl_dev_setup(struct net_device *dev)
1770 {
1771 dev->netdev_ops = &ip6_tnl_netdev_ops;
1772 dev->destructor = ip6_dev_free;
1773
1774 dev->type = ARPHRD_TUNNEL6;
1775 dev->flags |= IFF_NOARP;
1776 dev->addr_len = sizeof(struct in6_addr);
1777 dev->features |= NETIF_F_LLTX;
1778 netif_keep_dst(dev);
1779
1780 dev->features |= IPXIPX_FEATURES;
1781 dev->hw_features |= IPXIPX_FEATURES;
1782
1783 /* This perm addr will be used as interface identifier by IPv6 */
1784 dev->addr_assign_type = NET_ADDR_RANDOM;
1785 eth_random_addr(dev->perm_addr);
1786 }
1787
1788
1789 /**
1790 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1791 * @dev: virtual device associated with tunnel
1792 **/
1793
1794 static inline int
1795 ip6_tnl_dev_init_gen(struct net_device *dev)
1796 {
1797 struct ip6_tnl *t = netdev_priv(dev);
1798 int ret;
1799 int t_hlen;
1800
1801 t->dev = dev;
1802 t->net = dev_net(dev);
1803 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1804 if (!dev->tstats)
1805 return -ENOMEM;
1806
1807 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1808 if (ret)
1809 goto free_stats;
1810
1811 ret = gro_cells_init(&t->gro_cells, dev);
1812 if (ret)
1813 goto destroy_dst;
1814
1815 t->tun_hlen = 0;
1816 t->hlen = t->encap_hlen + t->tun_hlen;
1817 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1818
1819 dev->type = ARPHRD_TUNNEL6;
1820 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1821 dev->mtu = ETH_DATA_LEN - t_hlen;
1822 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1823 dev->mtu -= 8;
1824 dev->min_mtu = ETH_MIN_MTU;
1825 dev->max_mtu = 0xFFF8 - dev->hard_header_len;
1826
1827 return 0;
1828
1829 destroy_dst:
1830 dst_cache_destroy(&t->dst_cache);
1831 free_stats:
1832 free_percpu(dev->tstats);
1833 dev->tstats = NULL;
1834
1835 return ret;
1836 }
1837
1838 /**
1839 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1840 * @dev: virtual device associated with tunnel
1841 **/
1842
1843 static int ip6_tnl_dev_init(struct net_device *dev)
1844 {
1845 struct ip6_tnl *t = netdev_priv(dev);
1846 int err = ip6_tnl_dev_init_gen(dev);
1847
1848 if (err)
1849 return err;
1850 ip6_tnl_link_config(t);
1851 if (t->parms.collect_md) {
1852 dev->features |= NETIF_F_NETNS_LOCAL;
1853 netif_keep_dst(dev);
1854 }
1855 return 0;
1856 }
1857
1858 /**
1859 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1860 * @dev: fallback device
1861 *
1862 * Return: 0
1863 **/
1864
1865 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1866 {
1867 struct ip6_tnl *t = netdev_priv(dev);
1868 struct net *net = dev_net(dev);
1869 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1870
1871 t->parms.proto = IPPROTO_IPV6;
1872 dev_hold(dev);
1873
1874 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1875 return 0;
1876 }
1877
1878 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
1879 {
1880 u8 proto;
1881
1882 if (!data || !data[IFLA_IPTUN_PROTO])
1883 return 0;
1884
1885 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1886 if (proto != IPPROTO_IPV6 &&
1887 proto != IPPROTO_IPIP &&
1888 proto != 0)
1889 return -EINVAL;
1890
1891 return 0;
1892 }
1893
1894 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1895 struct __ip6_tnl_parm *parms)
1896 {
1897 memset(parms, 0, sizeof(*parms));
1898
1899 if (!data)
1900 return;
1901
1902 if (data[IFLA_IPTUN_LINK])
1903 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1904
1905 if (data[IFLA_IPTUN_LOCAL])
1906 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1907
1908 if (data[IFLA_IPTUN_REMOTE])
1909 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1910
1911 if (data[IFLA_IPTUN_TTL])
1912 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1913
1914 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1915 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1916
1917 if (data[IFLA_IPTUN_FLOWINFO])
1918 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1919
1920 if (data[IFLA_IPTUN_FLAGS])
1921 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1922
1923 if (data[IFLA_IPTUN_PROTO])
1924 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1925
1926 if (data[IFLA_IPTUN_COLLECT_METADATA])
1927 parms->collect_md = true;
1928
1929 if (data[IFLA_IPTUN_FWMARK])
1930 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1931 }
1932
1933 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1934 struct ip_tunnel_encap *ipencap)
1935 {
1936 bool ret = false;
1937
1938 memset(ipencap, 0, sizeof(*ipencap));
1939
1940 if (!data)
1941 return ret;
1942
1943 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1944 ret = true;
1945 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1946 }
1947
1948 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1949 ret = true;
1950 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1951 }
1952
1953 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1954 ret = true;
1955 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1956 }
1957
1958 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1959 ret = true;
1960 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1961 }
1962
1963 return ret;
1964 }
1965
1966 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1967 struct nlattr *tb[], struct nlattr *data[])
1968 {
1969 struct net *net = dev_net(dev);
1970 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1971 struct ip6_tnl *nt, *t;
1972 struct ip_tunnel_encap ipencap;
1973
1974 nt = netdev_priv(dev);
1975
1976 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1977 int err = ip6_tnl_encap_setup(nt, &ipencap);
1978
1979 if (err < 0)
1980 return err;
1981 }
1982
1983 ip6_tnl_netlink_parms(data, &nt->parms);
1984
1985 if (nt->parms.collect_md) {
1986 if (rtnl_dereference(ip6n->collect_md_tun))
1987 return -EEXIST;
1988 } else {
1989 t = ip6_tnl_locate(net, &nt->parms, 0);
1990 if (!IS_ERR(t))
1991 return -EEXIST;
1992 }
1993
1994 return ip6_tnl_create2(dev);
1995 }
1996
1997 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
1998 struct nlattr *data[])
1999 {
2000 struct ip6_tnl *t = netdev_priv(dev);
2001 struct __ip6_tnl_parm p;
2002 struct net *net = t->net;
2003 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2004 struct ip_tunnel_encap ipencap;
2005
2006 if (dev == ip6n->fb_tnl_dev)
2007 return -EINVAL;
2008
2009 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2010 int err = ip6_tnl_encap_setup(t, &ipencap);
2011
2012 if (err < 0)
2013 return err;
2014 }
2015 ip6_tnl_netlink_parms(data, &p);
2016 if (p.collect_md)
2017 return -EINVAL;
2018
2019 t = ip6_tnl_locate(net, &p, 0);
2020 if (!IS_ERR(t)) {
2021 if (t->dev != dev)
2022 return -EEXIST;
2023 } else
2024 t = netdev_priv(dev);
2025
2026 return ip6_tnl_update(t, &p);
2027 }
2028
2029 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2030 {
2031 struct net *net = dev_net(dev);
2032 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2033
2034 if (dev != ip6n->fb_tnl_dev)
2035 unregister_netdevice_queue(dev, head);
2036 }
2037
2038 static size_t ip6_tnl_get_size(const struct net_device *dev)
2039 {
2040 return
2041 /* IFLA_IPTUN_LINK */
2042 nla_total_size(4) +
2043 /* IFLA_IPTUN_LOCAL */
2044 nla_total_size(sizeof(struct in6_addr)) +
2045 /* IFLA_IPTUN_REMOTE */
2046 nla_total_size(sizeof(struct in6_addr)) +
2047 /* IFLA_IPTUN_TTL */
2048 nla_total_size(1) +
2049 /* IFLA_IPTUN_ENCAP_LIMIT */
2050 nla_total_size(1) +
2051 /* IFLA_IPTUN_FLOWINFO */
2052 nla_total_size(4) +
2053 /* IFLA_IPTUN_FLAGS */
2054 nla_total_size(4) +
2055 /* IFLA_IPTUN_PROTO */
2056 nla_total_size(1) +
2057 /* IFLA_IPTUN_ENCAP_TYPE */
2058 nla_total_size(2) +
2059 /* IFLA_IPTUN_ENCAP_FLAGS */
2060 nla_total_size(2) +
2061 /* IFLA_IPTUN_ENCAP_SPORT */
2062 nla_total_size(2) +
2063 /* IFLA_IPTUN_ENCAP_DPORT */
2064 nla_total_size(2) +
2065 /* IFLA_IPTUN_COLLECT_METADATA */
2066 nla_total_size(0) +
2067 /* IFLA_IPTUN_FWMARK */
2068 nla_total_size(4) +
2069 0;
2070 }
2071
2072 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2073 {
2074 struct ip6_tnl *tunnel = netdev_priv(dev);
2075 struct __ip6_tnl_parm *parm = &tunnel->parms;
2076
2077 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2078 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2079 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2080 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2081 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2082 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2083 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2084 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2085 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2086 goto nla_put_failure;
2087
2088 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2089 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2090 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2091 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2092 goto nla_put_failure;
2093
2094 if (parm->collect_md)
2095 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2096 goto nla_put_failure;
2097
2098 return 0;
2099
2100 nla_put_failure:
2101 return -EMSGSIZE;
2102 }
2103
2104 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2105 {
2106 struct ip6_tnl *tunnel = netdev_priv(dev);
2107
2108 return tunnel->net;
2109 }
2110 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2111
2112 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2113 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2114 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2115 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2116 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2117 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2118 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2119 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2120 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2121 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2122 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2123 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2124 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2125 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2126 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2127 };
2128
2129 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2130 .kind = "ip6tnl",
2131 .maxtype = IFLA_IPTUN_MAX,
2132 .policy = ip6_tnl_policy,
2133 .priv_size = sizeof(struct ip6_tnl),
2134 .setup = ip6_tnl_dev_setup,
2135 .validate = ip6_tnl_validate,
2136 .newlink = ip6_tnl_newlink,
2137 .changelink = ip6_tnl_changelink,
2138 .dellink = ip6_tnl_dellink,
2139 .get_size = ip6_tnl_get_size,
2140 .fill_info = ip6_tnl_fill_info,
2141 .get_link_net = ip6_tnl_get_link_net,
2142 };
2143
2144 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2145 .handler = ip4ip6_rcv,
2146 .err_handler = ip4ip6_err,
2147 .priority = 1,
2148 };
2149
2150 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2151 .handler = ip6ip6_rcv,
2152 .err_handler = ip6ip6_err,
2153 .priority = 1,
2154 };
2155
2156 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net)
2157 {
2158 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2159 struct net_device *dev, *aux;
2160 int h;
2161 struct ip6_tnl *t;
2162 LIST_HEAD(list);
2163
2164 for_each_netdev_safe(net, dev, aux)
2165 if (dev->rtnl_link_ops == &ip6_link_ops)
2166 unregister_netdevice_queue(dev, &list);
2167
2168 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2169 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2170 while (t) {
2171 /* If dev is in the same netns, it has already
2172 * been added to the list by the previous loop.
2173 */
2174 if (!net_eq(dev_net(t->dev), net))
2175 unregister_netdevice_queue(t->dev, &list);
2176 t = rtnl_dereference(t->next);
2177 }
2178 }
2179
2180 unregister_netdevice_many(&list);
2181 }
2182
2183 static int __net_init ip6_tnl_init_net(struct net *net)
2184 {
2185 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2186 struct ip6_tnl *t = NULL;
2187 int err;
2188
2189 ip6n->tnls[0] = ip6n->tnls_wc;
2190 ip6n->tnls[1] = ip6n->tnls_r_l;
2191
2192 err = -ENOMEM;
2193 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2194 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2195
2196 if (!ip6n->fb_tnl_dev)
2197 goto err_alloc_dev;
2198 dev_net_set(ip6n->fb_tnl_dev, net);
2199 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2200 /* FB netdevice is special: we have one, and only one per netns.
2201 * Allowing to move it to another netns is clearly unsafe.
2202 */
2203 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2204
2205 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2206 if (err < 0)
2207 goto err_register;
2208
2209 err = register_netdev(ip6n->fb_tnl_dev);
2210 if (err < 0)
2211 goto err_register;
2212
2213 t = netdev_priv(ip6n->fb_tnl_dev);
2214
2215 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2216 return 0;
2217
2218 err_register:
2219 ip6_dev_free(ip6n->fb_tnl_dev);
2220 err_alloc_dev:
2221 return err;
2222 }
2223
2224 static void __net_exit ip6_tnl_exit_net(struct net *net)
2225 {
2226 rtnl_lock();
2227 ip6_tnl_destroy_tunnels(net);
2228 rtnl_unlock();
2229 }
2230
2231 static struct pernet_operations ip6_tnl_net_ops = {
2232 .init = ip6_tnl_init_net,
2233 .exit = ip6_tnl_exit_net,
2234 .id = &ip6_tnl_net_id,
2235 .size = sizeof(struct ip6_tnl_net),
2236 };
2237
2238 /**
2239 * ip6_tunnel_init - register protocol and reserve needed resources
2240 *
2241 * Return: 0 on success
2242 **/
2243
2244 static int __init ip6_tunnel_init(void)
2245 {
2246 int err;
2247
2248 err = register_pernet_device(&ip6_tnl_net_ops);
2249 if (err < 0)
2250 goto out_pernet;
2251
2252 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2253 if (err < 0) {
2254 pr_err("%s: can't register ip4ip6\n", __func__);
2255 goto out_ip4ip6;
2256 }
2257
2258 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2259 if (err < 0) {
2260 pr_err("%s: can't register ip6ip6\n", __func__);
2261 goto out_ip6ip6;
2262 }
2263 err = rtnl_link_register(&ip6_link_ops);
2264 if (err < 0)
2265 goto rtnl_link_failed;
2266
2267 return 0;
2268
2269 rtnl_link_failed:
2270 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2271 out_ip6ip6:
2272 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2273 out_ip4ip6:
2274 unregister_pernet_device(&ip6_tnl_net_ops);
2275 out_pernet:
2276 return err;
2277 }
2278
2279 /**
2280 * ip6_tunnel_cleanup - free resources and unregister protocol
2281 **/
2282
2283 static void __exit ip6_tunnel_cleanup(void)
2284 {
2285 rtnl_link_unregister(&ip6_link_ops);
2286 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2287 pr_info("%s: can't deregister ip4ip6\n", __func__);
2288
2289 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2290 pr_info("%s: can't deregister ip6ip6\n", __func__);
2291
2292 unregister_pernet_device(&ip6_tnl_net_ops);
2293 }
2294
2295 module_init(ip6_tunnel_init);
2296 module_exit(ip6_tunnel_cleanup);
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