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[mirror_ubuntu-bionic-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 && 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 = -E2BIG;
301
302 if (p->name[0]) {
303 if (!dev_valid_name(p->name))
304 goto failed;
305 strlcpy(name, p->name, IFNAMSIZ);
306 } else {
307 sprintf(name, "ip6tnl%%d");
308 }
309 err = -ENOMEM;
310 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
311 ip6_tnl_dev_setup);
312 if (!dev)
313 goto failed;
314
315 dev_net_set(dev, net);
316
317 t = netdev_priv(dev);
318 t->parms = *p;
319 t->net = dev_net(dev);
320 err = ip6_tnl_create2(dev);
321 if (err < 0)
322 goto failed_free;
323
324 return t;
325
326 failed_free:
327 free_netdev(dev);
328 failed:
329 return ERR_PTR(err);
330 }
331
332 /**
333 * ip6_tnl_locate - find or create tunnel matching given parameters
334 * @p: tunnel parameters
335 * @create: != 0 if allowed to create new tunnel if no match found
336 *
337 * Description:
338 * ip6_tnl_locate() first tries to locate an existing tunnel
339 * based on @parms. If this is unsuccessful, but @create is set a new
340 * tunnel device is created and registered for use.
341 *
342 * Return:
343 * matching tunnel or error pointer
344 **/
345
346 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
347 struct __ip6_tnl_parm *p, int create)
348 {
349 const struct in6_addr *remote = &p->raddr;
350 const struct in6_addr *local = &p->laddr;
351 struct ip6_tnl __rcu **tp;
352 struct ip6_tnl *t;
353 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
354
355 for (tp = ip6_tnl_bucket(ip6n, p);
356 (t = rtnl_dereference(*tp)) != NULL;
357 tp = &t->next) {
358 if (ipv6_addr_equal(local, &t->parms.laddr) &&
359 ipv6_addr_equal(remote, &t->parms.raddr)) {
360 if (create)
361 return ERR_PTR(-EEXIST);
362
363 return t;
364 }
365 }
366 if (!create)
367 return ERR_PTR(-ENODEV);
368 return ip6_tnl_create(net, p);
369 }
370
371 /**
372 * ip6_tnl_dev_uninit - tunnel device uninitializer
373 * @dev: the device to be destroyed
374 *
375 * Description:
376 * ip6_tnl_dev_uninit() removes tunnel from its list
377 **/
378
379 static void
380 ip6_tnl_dev_uninit(struct net_device *dev)
381 {
382 struct ip6_tnl *t = netdev_priv(dev);
383 struct net *net = t->net;
384 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
385
386 if (dev == ip6n->fb_tnl_dev)
387 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
388 else
389 ip6_tnl_unlink(ip6n, t);
390 dst_cache_reset(&t->dst_cache);
391 dev_put(dev);
392 }
393
394 /**
395 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
396 * @skb: received socket buffer
397 *
398 * Return:
399 * 0 if none was found,
400 * else index to encapsulation limit
401 **/
402
403 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
404 {
405 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
406 unsigned int nhoff = raw - skb->data;
407 unsigned int off = nhoff + sizeof(*ipv6h);
408 u8 next, nexthdr = ipv6h->nexthdr;
409
410 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
411 struct ipv6_opt_hdr *hdr;
412 u16 optlen;
413
414 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
415 break;
416
417 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
418 if (nexthdr == NEXTHDR_FRAGMENT) {
419 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
420 if (frag_hdr->frag_off)
421 break;
422 optlen = 8;
423 } else if (nexthdr == NEXTHDR_AUTH) {
424 optlen = (hdr->hdrlen + 2) << 2;
425 } else {
426 optlen = ipv6_optlen(hdr);
427 }
428 /* cache hdr->nexthdr, since pskb_may_pull() might
429 * invalidate hdr
430 */
431 next = hdr->nexthdr;
432 if (nexthdr == NEXTHDR_DEST) {
433 u16 i = 2;
434
435 /* Remember : hdr is no longer valid at this point. */
436 if (!pskb_may_pull(skb, off + optlen))
437 break;
438
439 while (1) {
440 struct ipv6_tlv_tnl_enc_lim *tel;
441
442 /* No more room for encapsulation limit */
443 if (i + sizeof(*tel) > optlen)
444 break;
445
446 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
447 /* return index of option if found and valid */
448 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
449 tel->length == 1)
450 return i + off - nhoff;
451 /* else jump to next option */
452 if (tel->type)
453 i += tel->length + 2;
454 else
455 i++;
456 }
457 }
458 nexthdr = next;
459 off += optlen;
460 }
461 return 0;
462 }
463 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
464
465 /**
466 * ip6_tnl_err - tunnel error handler
467 *
468 * Description:
469 * ip6_tnl_err() should handle errors in the tunnel according
470 * to the specifications in RFC 2473.
471 **/
472
473 static int
474 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
475 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
476 {
477 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
478 struct net *net = dev_net(skb->dev);
479 u8 rel_type = ICMPV6_DEST_UNREACH;
480 u8 rel_code = ICMPV6_ADDR_UNREACH;
481 __u32 rel_info = 0;
482 struct ip6_tnl *t;
483 int err = -ENOENT;
484 int rel_msg = 0;
485 u8 tproto;
486 __u16 len;
487
488 /* If the packet doesn't contain the original IPv6 header we are
489 in trouble since we might need the source address for further
490 processing of the error. */
491
492 rcu_read_lock();
493 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
494 if (!t)
495 goto out;
496
497 tproto = READ_ONCE(t->parms.proto);
498 if (tproto != ipproto && tproto != 0)
499 goto out;
500
501 err = 0;
502
503 switch (*type) {
504 struct ipv6_tlv_tnl_enc_lim *tel;
505 __u32 mtu, teli;
506 case ICMPV6_DEST_UNREACH:
507 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
508 t->parms.name);
509 rel_msg = 1;
510 break;
511 case ICMPV6_TIME_EXCEED:
512 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
513 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
514 t->parms.name);
515 rel_msg = 1;
516 }
517 break;
518 case ICMPV6_PARAMPROB:
519 teli = 0;
520 if ((*code) == ICMPV6_HDR_FIELD)
521 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
522
523 if (teli && teli == *info - 2) {
524 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
525 if (tel->encap_limit == 0) {
526 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
527 t->parms.name);
528 rel_msg = 1;
529 }
530 } else {
531 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
532 t->parms.name);
533 }
534 break;
535 case ICMPV6_PKT_TOOBIG:
536 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
537 sock_net_uid(net, NULL));
538 mtu = *info - offset;
539 if (mtu < IPV6_MIN_MTU)
540 mtu = IPV6_MIN_MTU;
541 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
542 if (len > mtu) {
543 rel_type = ICMPV6_PKT_TOOBIG;
544 rel_code = 0;
545 rel_info = mtu;
546 rel_msg = 1;
547 }
548 break;
549 case NDISC_REDIRECT:
550 ip6_redirect(skb, net, skb->dev->ifindex, 0,
551 sock_net_uid(net, NULL));
552 break;
553 }
554
555 *type = rel_type;
556 *code = rel_code;
557 *info = rel_info;
558 *msg = rel_msg;
559
560 out:
561 rcu_read_unlock();
562 return err;
563 }
564
565 static int
566 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
567 u8 type, u8 code, int offset, __be32 info)
568 {
569 __u32 rel_info = ntohl(info);
570 const struct iphdr *eiph;
571 struct sk_buff *skb2;
572 int err, rel_msg = 0;
573 u8 rel_type = type;
574 u8 rel_code = code;
575 struct rtable *rt;
576 struct flowi4 fl4;
577
578 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
579 &rel_msg, &rel_info, offset);
580 if (err < 0)
581 return err;
582
583 if (rel_msg == 0)
584 return 0;
585
586 switch (rel_type) {
587 case ICMPV6_DEST_UNREACH:
588 if (rel_code != ICMPV6_ADDR_UNREACH)
589 return 0;
590 rel_type = ICMP_DEST_UNREACH;
591 rel_code = ICMP_HOST_UNREACH;
592 break;
593 case ICMPV6_PKT_TOOBIG:
594 if (rel_code != 0)
595 return 0;
596 rel_type = ICMP_DEST_UNREACH;
597 rel_code = ICMP_FRAG_NEEDED;
598 break;
599 default:
600 return 0;
601 }
602
603 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
604 return 0;
605
606 skb2 = skb_clone(skb, GFP_ATOMIC);
607 if (!skb2)
608 return 0;
609
610 skb_dst_drop(skb2);
611
612 skb_pull(skb2, offset);
613 skb_reset_network_header(skb2);
614 eiph = ip_hdr(skb2);
615
616 /* Try to guess incoming interface */
617 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
618 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
619 if (IS_ERR(rt))
620 goto out;
621
622 skb2->dev = rt->dst.dev;
623 ip_rt_put(rt);
624
625 /* route "incoming" packet */
626 if (rt->rt_flags & RTCF_LOCAL) {
627 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
628 eiph->daddr, eiph->saddr, 0, 0,
629 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
630 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) {
631 if (!IS_ERR(rt))
632 ip_rt_put(rt);
633 goto out;
634 }
635 skb_dst_set(skb2, &rt->dst);
636 } else {
637 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
638 skb2->dev) ||
639 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
640 goto out;
641 }
642
643 /* change mtu on this route */
644 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
645 if (rel_info > dst_mtu(skb_dst(skb2)))
646 goto out;
647
648 skb_dst_update_pmtu(skb2, rel_info);
649 }
650
651 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
652
653 out:
654 kfree_skb(skb2);
655 return 0;
656 }
657
658 static int
659 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
660 u8 type, u8 code, int offset, __be32 info)
661 {
662 __u32 rel_info = ntohl(info);
663 int err, rel_msg = 0;
664 u8 rel_type = type;
665 u8 rel_code = code;
666
667 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
668 &rel_msg, &rel_info, offset);
669 if (err < 0)
670 return err;
671
672 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
673 struct rt6_info *rt;
674 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
675
676 if (!skb2)
677 return 0;
678
679 skb_dst_drop(skb2);
680 skb_pull(skb2, offset);
681 skb_reset_network_header(skb2);
682
683 /* Try to guess incoming interface */
684 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
685 NULL, 0, 0);
686
687 if (rt && rt->dst.dev)
688 skb2->dev = rt->dst.dev;
689
690 icmpv6_send(skb2, rel_type, rel_code, rel_info);
691
692 ip6_rt_put(rt);
693
694 kfree_skb(skb2);
695 }
696
697 return 0;
698 }
699
700 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
701 const struct ipv6hdr *ipv6h,
702 struct sk_buff *skb)
703 {
704 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
705
706 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
707 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
708
709 return IP6_ECN_decapsulate(ipv6h, skb);
710 }
711
712 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
713 const struct ipv6hdr *ipv6h,
714 struct sk_buff *skb)
715 {
716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
717 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
718
719 return IP6_ECN_decapsulate(ipv6h, skb);
720 }
721
722 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
723 const struct in6_addr *laddr,
724 const struct in6_addr *raddr)
725 {
726 struct __ip6_tnl_parm *p = &t->parms;
727 int ltype = ipv6_addr_type(laddr);
728 int rtype = ipv6_addr_type(raddr);
729 __u32 flags = 0;
730
731 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
732 flags = IP6_TNL_F_CAP_PER_PACKET;
733 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
734 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
735 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
736 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
737 if (ltype&IPV6_ADDR_UNICAST)
738 flags |= IP6_TNL_F_CAP_XMIT;
739 if (rtype&IPV6_ADDR_UNICAST)
740 flags |= IP6_TNL_F_CAP_RCV;
741 }
742 return flags;
743 }
744 EXPORT_SYMBOL(ip6_tnl_get_cap);
745
746 /* called with rcu_read_lock() */
747 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
748 const struct in6_addr *laddr,
749 const struct in6_addr *raddr)
750 {
751 struct __ip6_tnl_parm *p = &t->parms;
752 int ret = 0;
753 struct net *net = t->net;
754
755 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
756 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
757 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
758 struct net_device *ldev = NULL;
759
760 if (p->link)
761 ldev = dev_get_by_index_rcu(net, p->link);
762
763 if ((ipv6_addr_is_multicast(laddr) ||
764 likely(ipv6_chk_addr(net, laddr, ldev, 0))) &&
765 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
766 likely(!ipv6_chk_addr(net, raddr, NULL, 0))))
767 ret = 1;
768 }
769 return ret;
770 }
771 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
772
773 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
774 const struct tnl_ptk_info *tpi,
775 struct metadata_dst *tun_dst,
776 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
777 const struct ipv6hdr *ipv6h,
778 struct sk_buff *skb),
779 bool log_ecn_err)
780 {
781 struct pcpu_sw_netstats *tstats;
782 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
783 int err;
784
785 if ((!(tpi->flags & TUNNEL_CSUM) &&
786 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
787 ((tpi->flags & TUNNEL_CSUM) &&
788 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
789 tunnel->dev->stats.rx_crc_errors++;
790 tunnel->dev->stats.rx_errors++;
791 goto drop;
792 }
793
794 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
795 if (!(tpi->flags & TUNNEL_SEQ) ||
796 (tunnel->i_seqno &&
797 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
798 tunnel->dev->stats.rx_fifo_errors++;
799 tunnel->dev->stats.rx_errors++;
800 goto drop;
801 }
802 tunnel->i_seqno = ntohl(tpi->seq) + 1;
803 }
804
805 skb->protocol = tpi->proto;
806
807 /* Warning: All skb pointers will be invalidated! */
808 if (tunnel->dev->type == ARPHRD_ETHER) {
809 if (!pskb_may_pull(skb, ETH_HLEN)) {
810 tunnel->dev->stats.rx_length_errors++;
811 tunnel->dev->stats.rx_errors++;
812 goto drop;
813 }
814
815 ipv6h = ipv6_hdr(skb);
816 skb->protocol = eth_type_trans(skb, tunnel->dev);
817 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
818 } else {
819 skb->dev = tunnel->dev;
820 }
821
822 skb_reset_network_header(skb);
823 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
824
825 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
826
827 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
828 if (unlikely(err)) {
829 if (log_ecn_err)
830 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
831 &ipv6h->saddr,
832 ipv6_get_dsfield(ipv6h));
833 if (err > 1) {
834 ++tunnel->dev->stats.rx_frame_errors;
835 ++tunnel->dev->stats.rx_errors;
836 goto drop;
837 }
838 }
839
840 tstats = this_cpu_ptr(tunnel->dev->tstats);
841 u64_stats_update_begin(&tstats->syncp);
842 tstats->rx_packets++;
843 tstats->rx_bytes += skb->len;
844 u64_stats_update_end(&tstats->syncp);
845
846 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
847
848 if (tun_dst)
849 skb_dst_set(skb, (struct dst_entry *)tun_dst);
850
851 gro_cells_receive(&tunnel->gro_cells, skb);
852 return 0;
853
854 drop:
855 if (tun_dst)
856 dst_release((struct dst_entry *)tun_dst);
857 kfree_skb(skb);
858 return 0;
859 }
860
861 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
862 const struct tnl_ptk_info *tpi,
863 struct metadata_dst *tun_dst,
864 bool log_ecn_err)
865 {
866 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate,
867 log_ecn_err);
868 }
869 EXPORT_SYMBOL(ip6_tnl_rcv);
870
871 static const struct tnl_ptk_info tpi_v6 = {
872 /* no tunnel info required for ipxip6. */
873 .proto = htons(ETH_P_IPV6),
874 };
875
876 static const struct tnl_ptk_info tpi_v4 = {
877 /* no tunnel info required for ipxip6. */
878 .proto = htons(ETH_P_IP),
879 };
880
881 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
882 const struct tnl_ptk_info *tpi,
883 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
884 const struct ipv6hdr *ipv6h,
885 struct sk_buff *skb))
886 {
887 struct ip6_tnl *t;
888 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
889 struct metadata_dst *tun_dst = NULL;
890 int ret = -1;
891
892 rcu_read_lock();
893 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
894
895 if (t) {
896 u8 tproto = READ_ONCE(t->parms.proto);
897
898 if (tproto != ipproto && tproto != 0)
899 goto drop;
900 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
901 goto drop;
902 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
903 goto drop;
904 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
905 goto drop;
906 if (t->parms.collect_md) {
907 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
908 if (!tun_dst)
909 goto drop;
910 }
911 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
912 log_ecn_error);
913 }
914
915 rcu_read_unlock();
916
917 return ret;
918
919 drop:
920 rcu_read_unlock();
921 kfree_skb(skb);
922 return 0;
923 }
924
925 static int ip4ip6_rcv(struct sk_buff *skb)
926 {
927 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
928 ip4ip6_dscp_ecn_decapsulate);
929 }
930
931 static int ip6ip6_rcv(struct sk_buff *skb)
932 {
933 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
934 ip6ip6_dscp_ecn_decapsulate);
935 }
936
937 struct ipv6_tel_txoption {
938 struct ipv6_txoptions ops;
939 __u8 dst_opt[8];
940 };
941
942 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
943 {
944 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
945
946 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
947 opt->dst_opt[3] = 1;
948 opt->dst_opt[4] = encap_limit;
949 opt->dst_opt[5] = IPV6_TLV_PADN;
950 opt->dst_opt[6] = 1;
951
952 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
953 opt->ops.opt_nflen = 8;
954 }
955
956 /**
957 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
958 * @t: the outgoing tunnel device
959 * @hdr: IPv6 header from the incoming packet
960 *
961 * Description:
962 * Avoid trivial tunneling loop by checking that tunnel exit-point
963 * doesn't match source of incoming packet.
964 *
965 * Return:
966 * 1 if conflict,
967 * 0 else
968 **/
969
970 static inline bool
971 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
972 {
973 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
974 }
975
976 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
977 const struct in6_addr *laddr,
978 const struct in6_addr *raddr)
979 {
980 struct __ip6_tnl_parm *p = &t->parms;
981 int ret = 0;
982 struct net *net = t->net;
983
984 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
985 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
986 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
987 struct net_device *ldev = NULL;
988
989 rcu_read_lock();
990 if (p->link)
991 ldev = dev_get_by_index_rcu(net, p->link);
992
993 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0)))
994 pr_warn("%s xmit: Local address not yet configured!\n",
995 p->name);
996 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
997 !ipv6_addr_is_multicast(raddr) &&
998 unlikely(ipv6_chk_addr(net, raddr, NULL, 0)))
999 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1000 p->name);
1001 else
1002 ret = 1;
1003 rcu_read_unlock();
1004 }
1005 return ret;
1006 }
1007 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1008
1009 /**
1010 * ip6_tnl_xmit - encapsulate packet and send
1011 * @skb: the outgoing socket buffer
1012 * @dev: the outgoing tunnel device
1013 * @dsfield: dscp code for outer header
1014 * @fl6: flow of tunneled packet
1015 * @encap_limit: encapsulation limit
1016 * @pmtu: Path MTU is stored if packet is too big
1017 * @proto: next header value
1018 *
1019 * Description:
1020 * Build new header and do some sanity checks on the packet before sending
1021 * it.
1022 *
1023 * Return:
1024 * 0 on success
1025 * -1 fail
1026 * %-EMSGSIZE message too big. return mtu in this case.
1027 **/
1028
1029 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1030 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1031 __u8 proto)
1032 {
1033 struct ip6_tnl *t = netdev_priv(dev);
1034 struct net *net = t->net;
1035 struct net_device_stats *stats = &t->dev->stats;
1036 struct ipv6hdr *ipv6h;
1037 struct ipv6_tel_txoption opt;
1038 struct dst_entry *dst = NULL, *ndst = NULL;
1039 struct net_device *tdev;
1040 int mtu;
1041 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1042 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1043 unsigned int max_headroom = psh_hlen;
1044 bool use_cache = false;
1045 u8 hop_limit;
1046 int err = -1;
1047
1048 if (t->parms.collect_md) {
1049 hop_limit = skb_tunnel_info(skb)->key.ttl;
1050 goto route_lookup;
1051 } else {
1052 hop_limit = t->parms.hop_limit;
1053 }
1054
1055 /* NBMA tunnel */
1056 if (ipv6_addr_any(&t->parms.raddr)) {
1057 if (skb->protocol == htons(ETH_P_IPV6)) {
1058 struct in6_addr *addr6;
1059 struct neighbour *neigh;
1060 int addr_type;
1061
1062 if (!skb_dst(skb))
1063 goto tx_err_link_failure;
1064
1065 neigh = dst_neigh_lookup(skb_dst(skb),
1066 &ipv6_hdr(skb)->daddr);
1067 if (!neigh)
1068 goto tx_err_link_failure;
1069
1070 addr6 = (struct in6_addr *)&neigh->primary_key;
1071 addr_type = ipv6_addr_type(addr6);
1072
1073 if (addr_type == IPV6_ADDR_ANY)
1074 addr6 = &ipv6_hdr(skb)->daddr;
1075
1076 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1077 neigh_release(neigh);
1078 }
1079 } else if (t->parms.proto != 0 && !(t->parms.flags &
1080 (IP6_TNL_F_USE_ORIG_TCLASS |
1081 IP6_TNL_F_USE_ORIG_FWMARK))) {
1082 /* enable the cache only if neither the outer protocol nor the
1083 * routing decision depends on the current inner header value
1084 */
1085 use_cache = true;
1086 }
1087
1088 if (use_cache)
1089 dst = dst_cache_get(&t->dst_cache);
1090
1091 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1092 goto tx_err_link_failure;
1093
1094 if (!dst) {
1095 route_lookup:
1096 /* add dsfield to flowlabel for route lookup */
1097 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1098
1099 dst = ip6_route_output(net, NULL, fl6);
1100
1101 if (dst->error)
1102 goto tx_err_link_failure;
1103 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1104 if (IS_ERR(dst)) {
1105 err = PTR_ERR(dst);
1106 dst = NULL;
1107 goto tx_err_link_failure;
1108 }
1109 if (t->parms.collect_md &&
1110 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1111 &fl6->daddr, 0, &fl6->saddr))
1112 goto tx_err_link_failure;
1113 ndst = dst;
1114 }
1115
1116 tdev = dst->dev;
1117
1118 if (tdev == dev) {
1119 stats->collisions++;
1120 net_warn_ratelimited("%s: Local routing loop detected!\n",
1121 t->parms.name);
1122 goto tx_err_dst_release;
1123 }
1124 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1125 if (encap_limit >= 0) {
1126 max_headroom += 8;
1127 mtu -= 8;
1128 }
1129 if (skb->protocol == htons(ETH_P_IPV6)) {
1130 if (mtu < IPV6_MIN_MTU)
1131 mtu = IPV6_MIN_MTU;
1132 } else if (mtu < 576) {
1133 mtu = 576;
1134 }
1135
1136 skb_dst_update_pmtu(skb, mtu);
1137 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1138 *pmtu = mtu;
1139 err = -EMSGSIZE;
1140 goto tx_err_dst_release;
1141 }
1142
1143 if (t->err_count > 0) {
1144 if (time_before(jiffies,
1145 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1146 t->err_count--;
1147
1148 dst_link_failure(skb);
1149 } else {
1150 t->err_count = 0;
1151 }
1152 }
1153
1154 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1155
1156 /*
1157 * Okay, now see if we can stuff it in the buffer as-is.
1158 */
1159 max_headroom += LL_RESERVED_SPACE(tdev);
1160
1161 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1162 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1163 struct sk_buff *new_skb;
1164
1165 new_skb = skb_realloc_headroom(skb, max_headroom);
1166 if (!new_skb)
1167 goto tx_err_dst_release;
1168
1169 if (skb->sk)
1170 skb_set_owner_w(new_skb, skb->sk);
1171 consume_skb(skb);
1172 skb = new_skb;
1173 }
1174
1175 if (t->parms.collect_md) {
1176 if (t->encap.type != TUNNEL_ENCAP_NONE)
1177 goto tx_err_dst_release;
1178 } else {
1179 if (use_cache && ndst)
1180 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1181 }
1182 skb_dst_set(skb, dst);
1183
1184 if (encap_limit >= 0) {
1185 init_tel_txopt(&opt, encap_limit);
1186 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1187 }
1188 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst);
1189
1190 /* Calculate max headroom for all the headers and adjust
1191 * needed_headroom if necessary.
1192 */
1193 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1194 + dst->header_len + t->hlen;
1195 if (max_headroom > dev->needed_headroom)
1196 dev->needed_headroom = max_headroom;
1197
1198 err = ip6_tnl_encap(skb, t, &proto, fl6);
1199 if (err)
1200 return err;
1201
1202 skb_push(skb, sizeof(struct ipv6hdr));
1203 skb_reset_network_header(skb);
1204 ipv6h = ipv6_hdr(skb);
1205 ip6_flow_hdr(ipv6h, dsfield,
1206 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1207 ipv6h->hop_limit = hop_limit;
1208 ipv6h->nexthdr = proto;
1209 ipv6h->saddr = fl6->saddr;
1210 ipv6h->daddr = fl6->daddr;
1211 ip6tunnel_xmit(NULL, skb, dev);
1212 return 0;
1213 tx_err_link_failure:
1214 stats->tx_carrier_errors++;
1215 dst_link_failure(skb);
1216 tx_err_dst_release:
1217 dst_release(dst);
1218 return err;
1219 }
1220 EXPORT_SYMBOL(ip6_tnl_xmit);
1221
1222 static inline int
1223 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1224 {
1225 struct ip6_tnl *t = netdev_priv(dev);
1226 const struct iphdr *iph = ip_hdr(skb);
1227 int encap_limit = -1;
1228 struct flowi6 fl6;
1229 __u8 dsfield;
1230 __u32 mtu;
1231 u8 tproto;
1232 int err;
1233
1234 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1235
1236 tproto = READ_ONCE(t->parms.proto);
1237 if (tproto != IPPROTO_IPIP && tproto != 0)
1238 return -1;
1239
1240 if (t->parms.collect_md) {
1241 struct ip_tunnel_info *tun_info;
1242 const struct ip_tunnel_key *key;
1243
1244 tun_info = skb_tunnel_info(skb);
1245 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1246 ip_tunnel_info_af(tun_info) != AF_INET6))
1247 return -1;
1248 key = &tun_info->key;
1249 memset(&fl6, 0, sizeof(fl6));
1250 fl6.flowi6_proto = IPPROTO_IPIP;
1251 fl6.daddr = key->u.ipv6.dst;
1252 fl6.flowlabel = key->label;
1253 dsfield = key->tos;
1254 } else {
1255 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1256 encap_limit = t->parms.encap_limit;
1257
1258 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1259 fl6.flowi6_proto = IPPROTO_IPIP;
1260
1261 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1262 dsfield = ipv4_get_dsfield(iph);
1263 else
1264 dsfield = ip6_tclass(t->parms.flowinfo);
1265 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1266 fl6.flowi6_mark = skb->mark;
1267 else
1268 fl6.flowi6_mark = t->parms.fwmark;
1269 }
1270
1271 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1272
1273 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1274 return -1;
1275
1276 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1277
1278 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1279
1280 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1281 IPPROTO_IPIP);
1282 if (err != 0) {
1283 /* XXX: send ICMP error even if DF is not set. */
1284 if (err == -EMSGSIZE)
1285 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1286 htonl(mtu));
1287 return -1;
1288 }
1289
1290 return 0;
1291 }
1292
1293 static inline int
1294 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1295 {
1296 struct ip6_tnl *t = netdev_priv(dev);
1297 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1298 int encap_limit = -1;
1299 __u16 offset;
1300 struct flowi6 fl6;
1301 __u8 dsfield;
1302 __u32 mtu;
1303 u8 tproto;
1304 int err;
1305
1306 tproto = READ_ONCE(t->parms.proto);
1307 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1308 ip6_tnl_addr_conflict(t, ipv6h))
1309 return -1;
1310
1311 if (t->parms.collect_md) {
1312 struct ip_tunnel_info *tun_info;
1313 const struct ip_tunnel_key *key;
1314
1315 tun_info = skb_tunnel_info(skb);
1316 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1317 ip_tunnel_info_af(tun_info) != AF_INET6))
1318 return -1;
1319 key = &tun_info->key;
1320 memset(&fl6, 0, sizeof(fl6));
1321 fl6.flowi6_proto = IPPROTO_IPV6;
1322 fl6.daddr = key->u.ipv6.dst;
1323 fl6.flowlabel = key->label;
1324 dsfield = key->tos;
1325 } else {
1326 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1327 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1328 ipv6h = ipv6_hdr(skb);
1329 if (offset > 0) {
1330 struct ipv6_tlv_tnl_enc_lim *tel;
1331
1332 tel = (void *)&skb_network_header(skb)[offset];
1333 if (tel->encap_limit == 0) {
1334 icmpv6_send(skb, ICMPV6_PARAMPROB,
1335 ICMPV6_HDR_FIELD, offset + 2);
1336 return -1;
1337 }
1338 encap_limit = tel->encap_limit - 1;
1339 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1340 encap_limit = t->parms.encap_limit;
1341 }
1342
1343 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1344 fl6.flowi6_proto = IPPROTO_IPV6;
1345
1346 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1347 dsfield = ipv6_get_dsfield(ipv6h);
1348 else
1349 dsfield = ip6_tclass(t->parms.flowinfo);
1350 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1351 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1352 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1353 fl6.flowi6_mark = skb->mark;
1354 else
1355 fl6.flowi6_mark = t->parms.fwmark;
1356 }
1357
1358 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1359
1360 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1361 return -1;
1362
1363 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1364
1365 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1366
1367 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1368 IPPROTO_IPV6);
1369 if (err != 0) {
1370 if (err == -EMSGSIZE)
1371 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1372 return -1;
1373 }
1374
1375 return 0;
1376 }
1377
1378 static netdev_tx_t
1379 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1380 {
1381 struct ip6_tnl *t = netdev_priv(dev);
1382 struct net_device_stats *stats = &t->dev->stats;
1383 int ret;
1384
1385 switch (skb->protocol) {
1386 case htons(ETH_P_IP):
1387 ret = ip4ip6_tnl_xmit(skb, dev);
1388 break;
1389 case htons(ETH_P_IPV6):
1390 ret = ip6ip6_tnl_xmit(skb, dev);
1391 break;
1392 default:
1393 goto tx_err;
1394 }
1395
1396 if (ret < 0)
1397 goto tx_err;
1398
1399 return NETDEV_TX_OK;
1400
1401 tx_err:
1402 stats->tx_errors++;
1403 stats->tx_dropped++;
1404 kfree_skb(skb);
1405 return NETDEV_TX_OK;
1406 }
1407
1408 static void ip6_tnl_link_config(struct ip6_tnl *t)
1409 {
1410 struct net_device *dev = t->dev;
1411 struct __ip6_tnl_parm *p = &t->parms;
1412 struct flowi6 *fl6 = &t->fl.u.ip6;
1413 int t_hlen;
1414
1415 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1416 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1417
1418 /* Set up flowi template */
1419 fl6->saddr = p->laddr;
1420 fl6->daddr = p->raddr;
1421 fl6->flowi6_oif = p->link;
1422 fl6->flowlabel = 0;
1423
1424 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1425 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1426 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1427 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1428
1429 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1430 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1431
1432 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1433 dev->flags |= IFF_POINTOPOINT;
1434 else
1435 dev->flags &= ~IFF_POINTOPOINT;
1436
1437 t->tun_hlen = 0;
1438 t->hlen = t->encap_hlen + t->tun_hlen;
1439 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1440
1441 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1442 int strict = (ipv6_addr_type(&p->raddr) &
1443 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1444
1445 struct rt6_info *rt = rt6_lookup(t->net,
1446 &p->raddr, &p->laddr,
1447 p->link, strict);
1448
1449 if (!rt)
1450 return;
1451
1452 if (rt->dst.dev) {
1453 dev->hard_header_len = rt->dst.dev->hard_header_len +
1454 t_hlen;
1455
1456 dev->mtu = rt->dst.dev->mtu - t_hlen;
1457 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1458 dev->mtu -= 8;
1459
1460 if (dev->mtu < IPV6_MIN_MTU)
1461 dev->mtu = IPV6_MIN_MTU;
1462 }
1463 ip6_rt_put(rt);
1464 }
1465 }
1466
1467 /**
1468 * ip6_tnl_change - update the tunnel parameters
1469 * @t: tunnel to be changed
1470 * @p: tunnel configuration parameters
1471 *
1472 * Description:
1473 * ip6_tnl_change() updates the tunnel parameters
1474 **/
1475
1476 static int
1477 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1478 {
1479 t->parms.laddr = p->laddr;
1480 t->parms.raddr = p->raddr;
1481 t->parms.flags = p->flags;
1482 t->parms.hop_limit = p->hop_limit;
1483 t->parms.encap_limit = p->encap_limit;
1484 t->parms.flowinfo = p->flowinfo;
1485 t->parms.link = p->link;
1486 t->parms.proto = p->proto;
1487 t->parms.fwmark = p->fwmark;
1488 dst_cache_reset(&t->dst_cache);
1489 ip6_tnl_link_config(t);
1490 return 0;
1491 }
1492
1493 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1494 {
1495 struct net *net = t->net;
1496 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1497 int err;
1498
1499 ip6_tnl_unlink(ip6n, t);
1500 synchronize_net();
1501 err = ip6_tnl_change(t, p);
1502 ip6_tnl_link(ip6n, t);
1503 netdev_state_change(t->dev);
1504 return err;
1505 }
1506
1507 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1508 {
1509 /* for default tnl0 device allow to change only the proto */
1510 t->parms.proto = p->proto;
1511 netdev_state_change(t->dev);
1512 return 0;
1513 }
1514
1515 static void
1516 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1517 {
1518 p->laddr = u->laddr;
1519 p->raddr = u->raddr;
1520 p->flags = u->flags;
1521 p->hop_limit = u->hop_limit;
1522 p->encap_limit = u->encap_limit;
1523 p->flowinfo = u->flowinfo;
1524 p->link = u->link;
1525 p->proto = u->proto;
1526 memcpy(p->name, u->name, sizeof(u->name));
1527 }
1528
1529 static void
1530 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1531 {
1532 u->laddr = p->laddr;
1533 u->raddr = p->raddr;
1534 u->flags = p->flags;
1535 u->hop_limit = p->hop_limit;
1536 u->encap_limit = p->encap_limit;
1537 u->flowinfo = p->flowinfo;
1538 u->link = p->link;
1539 u->proto = p->proto;
1540 memcpy(u->name, p->name, sizeof(u->name));
1541 }
1542
1543 /**
1544 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1545 * @dev: virtual device associated with tunnel
1546 * @ifr: parameters passed from userspace
1547 * @cmd: command to be performed
1548 *
1549 * Description:
1550 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1551 * from userspace.
1552 *
1553 * The possible commands are the following:
1554 * %SIOCGETTUNNEL: get tunnel parameters for device
1555 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1556 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1557 * %SIOCDELTUNNEL: delete tunnel
1558 *
1559 * The fallback device "ip6tnl0", created during module
1560 * initialization, can be used for creating other tunnel devices.
1561 *
1562 * Return:
1563 * 0 on success,
1564 * %-EFAULT if unable to copy data to or from userspace,
1565 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1566 * %-EINVAL if passed tunnel parameters are invalid,
1567 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1568 * %-ENODEV if attempting to change or delete a nonexisting device
1569 **/
1570
1571 static int
1572 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1573 {
1574 int err = 0;
1575 struct ip6_tnl_parm p;
1576 struct __ip6_tnl_parm p1;
1577 struct ip6_tnl *t = netdev_priv(dev);
1578 struct net *net = t->net;
1579 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1580
1581 memset(&p1, 0, sizeof(p1));
1582
1583 switch (cmd) {
1584 case SIOCGETTUNNEL:
1585 if (dev == ip6n->fb_tnl_dev) {
1586 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1587 err = -EFAULT;
1588 break;
1589 }
1590 ip6_tnl_parm_from_user(&p1, &p);
1591 t = ip6_tnl_locate(net, &p1, 0);
1592 if (IS_ERR(t))
1593 t = netdev_priv(dev);
1594 } else {
1595 memset(&p, 0, sizeof(p));
1596 }
1597 ip6_tnl_parm_to_user(&p, &t->parms);
1598 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1599 err = -EFAULT;
1600 }
1601 break;
1602 case SIOCADDTUNNEL:
1603 case SIOCCHGTUNNEL:
1604 err = -EPERM;
1605 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1606 break;
1607 err = -EFAULT;
1608 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1609 break;
1610 err = -EINVAL;
1611 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1612 p.proto != 0)
1613 break;
1614 ip6_tnl_parm_from_user(&p1, &p);
1615 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1616 if (cmd == SIOCCHGTUNNEL) {
1617 if (!IS_ERR(t)) {
1618 if (t->dev != dev) {
1619 err = -EEXIST;
1620 break;
1621 }
1622 } else
1623 t = netdev_priv(dev);
1624 if (dev == ip6n->fb_tnl_dev)
1625 err = ip6_tnl0_update(t, &p1);
1626 else
1627 err = ip6_tnl_update(t, &p1);
1628 }
1629 if (!IS_ERR(t)) {
1630 err = 0;
1631 ip6_tnl_parm_to_user(&p, &t->parms);
1632 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1633 err = -EFAULT;
1634
1635 } else {
1636 err = PTR_ERR(t);
1637 }
1638 break;
1639 case SIOCDELTUNNEL:
1640 err = -EPERM;
1641 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1642 break;
1643
1644 if (dev == ip6n->fb_tnl_dev) {
1645 err = -EFAULT;
1646 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1647 break;
1648 err = -ENOENT;
1649 ip6_tnl_parm_from_user(&p1, &p);
1650 t = ip6_tnl_locate(net, &p1, 0);
1651 if (IS_ERR(t))
1652 break;
1653 err = -EPERM;
1654 if (t->dev == ip6n->fb_tnl_dev)
1655 break;
1656 dev = t->dev;
1657 }
1658 err = 0;
1659 unregister_netdevice(dev);
1660 break;
1661 default:
1662 err = -EINVAL;
1663 }
1664 return err;
1665 }
1666
1667 /**
1668 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1669 * @dev: virtual device associated with tunnel
1670 * @new_mtu: the new mtu
1671 *
1672 * Return:
1673 * 0 on success,
1674 * %-EINVAL if mtu too small
1675 **/
1676
1677 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1678 {
1679 struct ip6_tnl *tnl = netdev_priv(dev);
1680
1681 if (tnl->parms.proto == IPPROTO_IPV6) {
1682 if (new_mtu < IPV6_MIN_MTU)
1683 return -EINVAL;
1684 } else {
1685 if (new_mtu < ETH_MIN_MTU)
1686 return -EINVAL;
1687 }
1688 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1689 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1690 return -EINVAL;
1691 } else {
1692 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1693 return -EINVAL;
1694 }
1695 dev->mtu = new_mtu;
1696 return 0;
1697 }
1698 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1699
1700 int ip6_tnl_get_iflink(const struct net_device *dev)
1701 {
1702 struct ip6_tnl *t = netdev_priv(dev);
1703
1704 return t->parms.link;
1705 }
1706 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1707
1708 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1709 unsigned int num)
1710 {
1711 if (num >= MAX_IPTUN_ENCAP_OPS)
1712 return -ERANGE;
1713
1714 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1715 &ip6tun_encaps[num],
1716 NULL, ops) ? 0 : -1;
1717 }
1718 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1719
1720 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1721 unsigned int num)
1722 {
1723 int ret;
1724
1725 if (num >= MAX_IPTUN_ENCAP_OPS)
1726 return -ERANGE;
1727
1728 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1729 &ip6tun_encaps[num],
1730 ops, NULL) == ops) ? 0 : -1;
1731
1732 synchronize_net();
1733
1734 return ret;
1735 }
1736 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1737
1738 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1739 struct ip_tunnel_encap *ipencap)
1740 {
1741 int hlen;
1742
1743 memset(&t->encap, 0, sizeof(t->encap));
1744
1745 hlen = ip6_encap_hlen(ipencap);
1746 if (hlen < 0)
1747 return hlen;
1748
1749 t->encap.type = ipencap->type;
1750 t->encap.sport = ipencap->sport;
1751 t->encap.dport = ipencap->dport;
1752 t->encap.flags = ipencap->flags;
1753
1754 t->encap_hlen = hlen;
1755 t->hlen = t->encap_hlen + t->tun_hlen;
1756
1757 return 0;
1758 }
1759 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1760
1761 static const struct net_device_ops ip6_tnl_netdev_ops = {
1762 .ndo_init = ip6_tnl_dev_init,
1763 .ndo_uninit = ip6_tnl_dev_uninit,
1764 .ndo_start_xmit = ip6_tnl_start_xmit,
1765 .ndo_do_ioctl = ip6_tnl_ioctl,
1766 .ndo_change_mtu = ip6_tnl_change_mtu,
1767 .ndo_get_stats = ip6_get_stats,
1768 .ndo_get_iflink = ip6_tnl_get_iflink,
1769 };
1770
1771 #define IPXIPX_FEATURES (NETIF_F_SG | \
1772 NETIF_F_FRAGLIST | \
1773 NETIF_F_HIGHDMA | \
1774 NETIF_F_GSO_SOFTWARE | \
1775 NETIF_F_HW_CSUM)
1776
1777 /**
1778 * ip6_tnl_dev_setup - setup virtual tunnel device
1779 * @dev: virtual device associated with tunnel
1780 *
1781 * Description:
1782 * Initialize function pointers and device parameters
1783 **/
1784
1785 static void ip6_tnl_dev_setup(struct net_device *dev)
1786 {
1787 dev->netdev_ops = &ip6_tnl_netdev_ops;
1788 dev->needs_free_netdev = true;
1789 dev->priv_destructor = ip6_dev_free;
1790
1791 dev->type = ARPHRD_TUNNEL6;
1792 dev->flags |= IFF_NOARP;
1793 dev->addr_len = sizeof(struct in6_addr);
1794 dev->features |= NETIF_F_LLTX;
1795 netif_keep_dst(dev);
1796
1797 dev->features |= IPXIPX_FEATURES;
1798 dev->hw_features |= IPXIPX_FEATURES;
1799
1800 /* This perm addr will be used as interface identifier by IPv6 */
1801 dev->addr_assign_type = NET_ADDR_RANDOM;
1802 eth_random_addr(dev->perm_addr);
1803 }
1804
1805
1806 /**
1807 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1808 * @dev: virtual device associated with tunnel
1809 **/
1810
1811 static inline int
1812 ip6_tnl_dev_init_gen(struct net_device *dev)
1813 {
1814 struct ip6_tnl *t = netdev_priv(dev);
1815 int ret;
1816 int t_hlen;
1817
1818 t->dev = dev;
1819 t->net = dev_net(dev);
1820 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1821 if (!dev->tstats)
1822 return -ENOMEM;
1823
1824 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1825 if (ret)
1826 goto free_stats;
1827
1828 ret = gro_cells_init(&t->gro_cells, dev);
1829 if (ret)
1830 goto destroy_dst;
1831
1832 t->tun_hlen = 0;
1833 t->hlen = t->encap_hlen + t->tun_hlen;
1834 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1835
1836 dev->type = ARPHRD_TUNNEL6;
1837 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1838 dev->mtu = ETH_DATA_LEN - t_hlen;
1839 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1840 dev->mtu -= 8;
1841 dev->min_mtu = ETH_MIN_MTU;
1842 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1843
1844 return 0;
1845
1846 destroy_dst:
1847 dst_cache_destroy(&t->dst_cache);
1848 free_stats:
1849 free_percpu(dev->tstats);
1850 dev->tstats = NULL;
1851
1852 return ret;
1853 }
1854
1855 /**
1856 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1857 * @dev: virtual device associated with tunnel
1858 **/
1859
1860 static int ip6_tnl_dev_init(struct net_device *dev)
1861 {
1862 struct ip6_tnl *t = netdev_priv(dev);
1863 int err = ip6_tnl_dev_init_gen(dev);
1864
1865 if (err)
1866 return err;
1867 ip6_tnl_link_config(t);
1868 if (t->parms.collect_md) {
1869 dev->features |= NETIF_F_NETNS_LOCAL;
1870 netif_keep_dst(dev);
1871 }
1872 return 0;
1873 }
1874
1875 /**
1876 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1877 * @dev: fallback device
1878 *
1879 * Return: 0
1880 **/
1881
1882 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1883 {
1884 struct ip6_tnl *t = netdev_priv(dev);
1885 struct net *net = dev_net(dev);
1886 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1887
1888 t->parms.proto = IPPROTO_IPV6;
1889 dev_hold(dev);
1890
1891 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1892 return 0;
1893 }
1894
1895 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1896 struct netlink_ext_ack *extack)
1897 {
1898 u8 proto;
1899
1900 if (!data || !data[IFLA_IPTUN_PROTO])
1901 return 0;
1902
1903 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1904 if (proto != IPPROTO_IPV6 &&
1905 proto != IPPROTO_IPIP &&
1906 proto != 0)
1907 return -EINVAL;
1908
1909 return 0;
1910 }
1911
1912 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1913 struct __ip6_tnl_parm *parms)
1914 {
1915 memset(parms, 0, sizeof(*parms));
1916
1917 if (!data)
1918 return;
1919
1920 if (data[IFLA_IPTUN_LINK])
1921 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1922
1923 if (data[IFLA_IPTUN_LOCAL])
1924 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1925
1926 if (data[IFLA_IPTUN_REMOTE])
1927 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1928
1929 if (data[IFLA_IPTUN_TTL])
1930 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1931
1932 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1933 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1934
1935 if (data[IFLA_IPTUN_FLOWINFO])
1936 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1937
1938 if (data[IFLA_IPTUN_FLAGS])
1939 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1940
1941 if (data[IFLA_IPTUN_PROTO])
1942 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1943
1944 if (data[IFLA_IPTUN_COLLECT_METADATA])
1945 parms->collect_md = true;
1946
1947 if (data[IFLA_IPTUN_FWMARK])
1948 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1949 }
1950
1951 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1952 struct ip_tunnel_encap *ipencap)
1953 {
1954 bool ret = false;
1955
1956 memset(ipencap, 0, sizeof(*ipencap));
1957
1958 if (!data)
1959 return ret;
1960
1961 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1962 ret = true;
1963 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1964 }
1965
1966 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1967 ret = true;
1968 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1969 }
1970
1971 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1972 ret = true;
1973 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1974 }
1975
1976 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1977 ret = true;
1978 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1979 }
1980
1981 return ret;
1982 }
1983
1984 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
1985 struct nlattr *tb[], struct nlattr *data[],
1986 struct netlink_ext_ack *extack)
1987 {
1988 struct net *net = dev_net(dev);
1989 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1990 struct ip_tunnel_encap ipencap;
1991 struct ip6_tnl *nt, *t;
1992 int err;
1993
1994 nt = netdev_priv(dev);
1995
1996 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
1997 err = ip6_tnl_encap_setup(nt, &ipencap);
1998 if (err < 0)
1999 return err;
2000 }
2001
2002 ip6_tnl_netlink_parms(data, &nt->parms);
2003
2004 if (nt->parms.collect_md) {
2005 if (rtnl_dereference(ip6n->collect_md_tun))
2006 return -EEXIST;
2007 } else {
2008 t = ip6_tnl_locate(net, &nt->parms, 0);
2009 if (!IS_ERR(t))
2010 return -EEXIST;
2011 }
2012
2013 err = ip6_tnl_create2(dev);
2014 if (!err && tb[IFLA_MTU])
2015 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2016
2017 return err;
2018 }
2019
2020 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2021 struct nlattr *data[],
2022 struct netlink_ext_ack *extack)
2023 {
2024 struct ip6_tnl *t = netdev_priv(dev);
2025 struct __ip6_tnl_parm p;
2026 struct net *net = t->net;
2027 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2028 struct ip_tunnel_encap ipencap;
2029
2030 if (dev == ip6n->fb_tnl_dev)
2031 return -EINVAL;
2032
2033 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2034 int err = ip6_tnl_encap_setup(t, &ipencap);
2035
2036 if (err < 0)
2037 return err;
2038 }
2039 ip6_tnl_netlink_parms(data, &p);
2040 if (p.collect_md)
2041 return -EINVAL;
2042
2043 t = ip6_tnl_locate(net, &p, 0);
2044 if (!IS_ERR(t)) {
2045 if (t->dev != dev)
2046 return -EEXIST;
2047 } else
2048 t = netdev_priv(dev);
2049
2050 return ip6_tnl_update(t, &p);
2051 }
2052
2053 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2054 {
2055 struct net *net = dev_net(dev);
2056 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2057
2058 if (dev != ip6n->fb_tnl_dev)
2059 unregister_netdevice_queue(dev, head);
2060 }
2061
2062 static size_t ip6_tnl_get_size(const struct net_device *dev)
2063 {
2064 return
2065 /* IFLA_IPTUN_LINK */
2066 nla_total_size(4) +
2067 /* IFLA_IPTUN_LOCAL */
2068 nla_total_size(sizeof(struct in6_addr)) +
2069 /* IFLA_IPTUN_REMOTE */
2070 nla_total_size(sizeof(struct in6_addr)) +
2071 /* IFLA_IPTUN_TTL */
2072 nla_total_size(1) +
2073 /* IFLA_IPTUN_ENCAP_LIMIT */
2074 nla_total_size(1) +
2075 /* IFLA_IPTUN_FLOWINFO */
2076 nla_total_size(4) +
2077 /* IFLA_IPTUN_FLAGS */
2078 nla_total_size(4) +
2079 /* IFLA_IPTUN_PROTO */
2080 nla_total_size(1) +
2081 /* IFLA_IPTUN_ENCAP_TYPE */
2082 nla_total_size(2) +
2083 /* IFLA_IPTUN_ENCAP_FLAGS */
2084 nla_total_size(2) +
2085 /* IFLA_IPTUN_ENCAP_SPORT */
2086 nla_total_size(2) +
2087 /* IFLA_IPTUN_ENCAP_DPORT */
2088 nla_total_size(2) +
2089 /* IFLA_IPTUN_COLLECT_METADATA */
2090 nla_total_size(0) +
2091 /* IFLA_IPTUN_FWMARK */
2092 nla_total_size(4) +
2093 0;
2094 }
2095
2096 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2097 {
2098 struct ip6_tnl *tunnel = netdev_priv(dev);
2099 struct __ip6_tnl_parm *parm = &tunnel->parms;
2100
2101 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2102 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2103 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2104 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2105 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2106 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2107 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2108 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2109 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2110 goto nla_put_failure;
2111
2112 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2113 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2114 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2115 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2116 goto nla_put_failure;
2117
2118 if (parm->collect_md)
2119 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2120 goto nla_put_failure;
2121
2122 return 0;
2123
2124 nla_put_failure:
2125 return -EMSGSIZE;
2126 }
2127
2128 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2129 {
2130 struct ip6_tnl *tunnel = netdev_priv(dev);
2131
2132 return tunnel->net;
2133 }
2134 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2135
2136 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2137 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2138 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2139 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2140 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2141 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2142 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2143 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2144 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2145 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2146 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2147 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2148 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2149 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2150 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2151 };
2152
2153 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2154 .kind = "ip6tnl",
2155 .maxtype = IFLA_IPTUN_MAX,
2156 .policy = ip6_tnl_policy,
2157 .priv_size = sizeof(struct ip6_tnl),
2158 .setup = ip6_tnl_dev_setup,
2159 .validate = ip6_tnl_validate,
2160 .newlink = ip6_tnl_newlink,
2161 .changelink = ip6_tnl_changelink,
2162 .dellink = ip6_tnl_dellink,
2163 .get_size = ip6_tnl_get_size,
2164 .fill_info = ip6_tnl_fill_info,
2165 .get_link_net = ip6_tnl_get_link_net,
2166 };
2167
2168 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2169 .handler = ip4ip6_rcv,
2170 .err_handler = ip4ip6_err,
2171 .priority = 1,
2172 };
2173
2174 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2175 .handler = ip6ip6_rcv,
2176 .err_handler = ip6ip6_err,
2177 .priority = 1,
2178 };
2179
2180 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2181 {
2182 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2183 struct net_device *dev, *aux;
2184 int h;
2185 struct ip6_tnl *t;
2186
2187 for_each_netdev_safe(net, dev, aux)
2188 if (dev->rtnl_link_ops == &ip6_link_ops)
2189 unregister_netdevice_queue(dev, list);
2190
2191 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2192 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2193 while (t) {
2194 /* If dev is in the same netns, it has already
2195 * been added to the list by the previous loop.
2196 */
2197 if (!net_eq(dev_net(t->dev), net))
2198 unregister_netdevice_queue(t->dev, list);
2199 t = rtnl_dereference(t->next);
2200 }
2201 }
2202 }
2203
2204 static int __net_init ip6_tnl_init_net(struct net *net)
2205 {
2206 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2207 struct ip6_tnl *t = NULL;
2208 int err;
2209
2210 ip6n->tnls[0] = ip6n->tnls_wc;
2211 ip6n->tnls[1] = ip6n->tnls_r_l;
2212
2213 err = -ENOMEM;
2214 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2215 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2216
2217 if (!ip6n->fb_tnl_dev)
2218 goto err_alloc_dev;
2219 dev_net_set(ip6n->fb_tnl_dev, net);
2220 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2221 /* FB netdevice is special: we have one, and only one per netns.
2222 * Allowing to move it to another netns is clearly unsafe.
2223 */
2224 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2225
2226 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2227 if (err < 0)
2228 goto err_register;
2229
2230 err = register_netdev(ip6n->fb_tnl_dev);
2231 if (err < 0)
2232 goto err_register;
2233
2234 t = netdev_priv(ip6n->fb_tnl_dev);
2235
2236 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2237 return 0;
2238
2239 err_register:
2240 free_netdev(ip6n->fb_tnl_dev);
2241 err_alloc_dev:
2242 return err;
2243 }
2244
2245 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2246 {
2247 struct net *net;
2248 LIST_HEAD(list);
2249
2250 rtnl_lock();
2251 list_for_each_entry(net, net_list, exit_list)
2252 ip6_tnl_destroy_tunnels(net, &list);
2253 unregister_netdevice_many(&list);
2254 rtnl_unlock();
2255 }
2256
2257 static struct pernet_operations ip6_tnl_net_ops = {
2258 .init = ip6_tnl_init_net,
2259 .exit_batch = ip6_tnl_exit_batch_net,
2260 .id = &ip6_tnl_net_id,
2261 .size = sizeof(struct ip6_tnl_net),
2262 };
2263
2264 /**
2265 * ip6_tunnel_init - register protocol and reserve needed resources
2266 *
2267 * Return: 0 on success
2268 **/
2269
2270 static int __init ip6_tunnel_init(void)
2271 {
2272 int err;
2273
2274 if (!ipv6_mod_enabled())
2275 return -EOPNOTSUPP;
2276
2277 err = register_pernet_device(&ip6_tnl_net_ops);
2278 if (err < 0)
2279 goto out_pernet;
2280
2281 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2282 if (err < 0) {
2283 pr_err("%s: can't register ip4ip6\n", __func__);
2284 goto out_ip4ip6;
2285 }
2286
2287 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2288 if (err < 0) {
2289 pr_err("%s: can't register ip6ip6\n", __func__);
2290 goto out_ip6ip6;
2291 }
2292 err = rtnl_link_register(&ip6_link_ops);
2293 if (err < 0)
2294 goto rtnl_link_failed;
2295
2296 return 0;
2297
2298 rtnl_link_failed:
2299 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2300 out_ip6ip6:
2301 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2302 out_ip4ip6:
2303 unregister_pernet_device(&ip6_tnl_net_ops);
2304 out_pernet:
2305 return err;
2306 }
2307
2308 /**
2309 * ip6_tunnel_cleanup - free resources and unregister protocol
2310 **/
2311
2312 static void __exit ip6_tunnel_cleanup(void)
2313 {
2314 rtnl_link_unregister(&ip6_link_ops);
2315 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2316 pr_info("%s: can't deregister ip4ip6\n", __func__);
2317
2318 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2319 pr_info("%s: can't deregister ip6ip6\n", __func__);
2320
2321 unregister_pernet_device(&ip6_tnl_net_ops);
2322 }
2323
2324 module_init(ip6_tunnel_init);
2325 module_exit(ip6_tunnel_cleanup);
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