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Linux 5.1.15
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blobade1390c63488a60b405ca70052b3493fecc67d5
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_TUNNEL6) {
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_TUNNEL6)
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, skb2, 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_and_flags(net, laddr, ldev, false,
765 0, IFA_F_TENTATIVE))) &&
766 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
767 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
768 0, IFA_F_TENTATIVE))))
769 ret = 1;
770 }
771 return ret;
772 }
773 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
774
775 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
776 const struct tnl_ptk_info *tpi,
777 struct metadata_dst *tun_dst,
778 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
779 const struct ipv6hdr *ipv6h,
780 struct sk_buff *skb),
781 bool log_ecn_err)
782 {
783 struct pcpu_sw_netstats *tstats;
784 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
785 int err;
786
787 if ((!(tpi->flags & TUNNEL_CSUM) &&
788 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
789 ((tpi->flags & TUNNEL_CSUM) &&
790 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
791 tunnel->dev->stats.rx_crc_errors++;
792 tunnel->dev->stats.rx_errors++;
793 goto drop;
794 }
795
796 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
797 if (!(tpi->flags & TUNNEL_SEQ) ||
798 (tunnel->i_seqno &&
799 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
800 tunnel->dev->stats.rx_fifo_errors++;
801 tunnel->dev->stats.rx_errors++;
802 goto drop;
803 }
804 tunnel->i_seqno = ntohl(tpi->seq) + 1;
805 }
806
807 skb->protocol = tpi->proto;
808
809 /* Warning: All skb pointers will be invalidated! */
810 if (tunnel->dev->type == ARPHRD_ETHER) {
811 if (!pskb_may_pull(skb, ETH_HLEN)) {
812 tunnel->dev->stats.rx_length_errors++;
813 tunnel->dev->stats.rx_errors++;
814 goto drop;
815 }
816
817 ipv6h = ipv6_hdr(skb);
818 skb->protocol = eth_type_trans(skb, tunnel->dev);
819 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
820 } else {
821 skb->dev = tunnel->dev;
822 }
823
824 skb_reset_network_header(skb);
825 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
826
827 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
828
829 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
830 if (unlikely(err)) {
831 if (log_ecn_err)
832 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
833 &ipv6h->saddr,
834 ipv6_get_dsfield(ipv6h));
835 if (err > 1) {
836 ++tunnel->dev->stats.rx_frame_errors;
837 ++tunnel->dev->stats.rx_errors;
838 goto drop;
839 }
840 }
841
842 tstats = this_cpu_ptr(tunnel->dev->tstats);
843 u64_stats_update_begin(&tstats->syncp);
844 tstats->rx_packets++;
845 tstats->rx_bytes += skb->len;
846 u64_stats_update_end(&tstats->syncp);
847
848 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
849
850 if (tun_dst)
851 skb_dst_set(skb, (struct dst_entry *)tun_dst);
852
853 gro_cells_receive(&tunnel->gro_cells, skb);
854 return 0;
855
856 drop:
857 if (tun_dst)
858 dst_release((struct dst_entry *)tun_dst);
859 kfree_skb(skb);
860 return 0;
861 }
862
863 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
864 const struct tnl_ptk_info *tpi,
865 struct metadata_dst *tun_dst,
866 bool log_ecn_err)
867 {
868 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
869 log_ecn_err);
870 }
871 EXPORT_SYMBOL(ip6_tnl_rcv);
872
873 static const struct tnl_ptk_info tpi_v6 = {
874 /* no tunnel info required for ipxip6. */
875 .proto = htons(ETH_P_IPV6),
876 };
877
878 static const struct tnl_ptk_info tpi_v4 = {
879 /* no tunnel info required for ipxip6. */
880 .proto = htons(ETH_P_IP),
881 };
882
883 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
884 const struct tnl_ptk_info *tpi,
885 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
886 const struct ipv6hdr *ipv6h,
887 struct sk_buff *skb))
888 {
889 struct ip6_tnl *t;
890 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
891 struct metadata_dst *tun_dst = NULL;
892 int ret = -1;
893
894 rcu_read_lock();
895 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
896
897 if (t) {
898 u8 tproto = READ_ONCE(t->parms.proto);
899
900 if (tproto != ipproto && tproto != 0)
901 goto drop;
902 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
903 goto drop;
904 ipv6h = ipv6_hdr(skb);
905 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
906 goto drop;
907 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
908 goto drop;
909 if (t->parms.collect_md) {
910 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
911 if (!tun_dst)
912 goto drop;
913 }
914 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
915 log_ecn_error);
916 }
917
918 rcu_read_unlock();
919
920 return ret;
921
922 drop:
923 rcu_read_unlock();
924 kfree_skb(skb);
925 return 0;
926 }
927
928 static int ip4ip6_rcv(struct sk_buff *skb)
929 {
930 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
931 ip4ip6_dscp_ecn_decapsulate);
932 }
933
934 static int ip6ip6_rcv(struct sk_buff *skb)
935 {
936 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
937 ip6ip6_dscp_ecn_decapsulate);
938 }
939
940 struct ipv6_tel_txoption {
941 struct ipv6_txoptions ops;
942 __u8 dst_opt[8];
943 };
944
945 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
946 {
947 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
948
949 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
950 opt->dst_opt[3] = 1;
951 opt->dst_opt[4] = encap_limit;
952 opt->dst_opt[5] = IPV6_TLV_PADN;
953 opt->dst_opt[6] = 1;
954
955 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
956 opt->ops.opt_nflen = 8;
957 }
958
959 /**
960 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
961 * @t: the outgoing tunnel device
962 * @hdr: IPv6 header from the incoming packet
963 *
964 * Description:
965 * Avoid trivial tunneling loop by checking that tunnel exit-point
966 * doesn't match source of incoming packet.
967 *
968 * Return:
969 * 1 if conflict,
970 * 0 else
971 **/
972
973 static inline bool
974 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
975 {
976 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
977 }
978
979 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
980 const struct in6_addr *laddr,
981 const struct in6_addr *raddr)
982 {
983 struct __ip6_tnl_parm *p = &t->parms;
984 int ret = 0;
985 struct net *net = t->net;
986
987 if (t->parms.collect_md)
988 return 1;
989
990 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
991 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
992 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
993 struct net_device *ldev = NULL;
994
995 rcu_read_lock();
996 if (p->link)
997 ldev = dev_get_by_index_rcu(net, p->link);
998
999 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1000 0, IFA_F_TENTATIVE)))
1001 pr_warn("%s xmit: Local address not yet configured!\n",
1002 p->name);
1003 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1004 !ipv6_addr_is_multicast(raddr) &&
1005 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1006 true, 0, IFA_F_TENTATIVE)))
1007 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1008 p->name);
1009 else
1010 ret = 1;
1011 rcu_read_unlock();
1012 }
1013 return ret;
1014 }
1015 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1016
1017 /**
1018 * ip6_tnl_xmit - encapsulate packet and send
1019 * @skb: the outgoing socket buffer
1020 * @dev: the outgoing tunnel device
1021 * @dsfield: dscp code for outer header
1022 * @fl6: flow of tunneled packet
1023 * @encap_limit: encapsulation limit
1024 * @pmtu: Path MTU is stored if packet is too big
1025 * @proto: next header value
1026 *
1027 * Description:
1028 * Build new header and do some sanity checks on the packet before sending
1029 * it.
1030 *
1031 * Return:
1032 * 0 on success
1033 * -1 fail
1034 * %-EMSGSIZE message too big. return mtu in this case.
1035 **/
1036
1037 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1038 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1039 __u8 proto)
1040 {
1041 struct ip6_tnl *t = netdev_priv(dev);
1042 struct net *net = t->net;
1043 struct net_device_stats *stats = &t->dev->stats;
1044 struct ipv6hdr *ipv6h;
1045 struct ipv6_tel_txoption opt;
1046 struct dst_entry *dst = NULL, *ndst = NULL;
1047 struct net_device *tdev;
1048 int mtu;
1049 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1050 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1051 unsigned int max_headroom = psh_hlen;
1052 bool use_cache = false;
1053 u8 hop_limit;
1054 int err = -1;
1055
1056 if (t->parms.collect_md) {
1057 hop_limit = skb_tunnel_info(skb)->key.ttl;
1058 goto route_lookup;
1059 } else {
1060 hop_limit = t->parms.hop_limit;
1061 }
1062
1063 /* NBMA tunnel */
1064 if (ipv6_addr_any(&t->parms.raddr)) {
1065 if (skb->protocol == htons(ETH_P_IPV6)) {
1066 struct in6_addr *addr6;
1067 struct neighbour *neigh;
1068 int addr_type;
1069
1070 if (!skb_dst(skb))
1071 goto tx_err_link_failure;
1072
1073 neigh = dst_neigh_lookup(skb_dst(skb),
1074 &ipv6_hdr(skb)->daddr);
1075 if (!neigh)
1076 goto tx_err_link_failure;
1077
1078 addr6 = (struct in6_addr *)&neigh->primary_key;
1079 addr_type = ipv6_addr_type(addr6);
1080
1081 if (addr_type == IPV6_ADDR_ANY)
1082 addr6 = &ipv6_hdr(skb)->daddr;
1083
1084 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1085 neigh_release(neigh);
1086 }
1087 } else if (t->parms.proto != 0 && !(t->parms.flags &
1088 (IP6_TNL_F_USE_ORIG_TCLASS |
1089 IP6_TNL_F_USE_ORIG_FWMARK))) {
1090 /* enable the cache only if neither the outer protocol nor the
1091 * routing decision depends on the current inner header value
1092 */
1093 use_cache = true;
1094 }
1095
1096 if (use_cache)
1097 dst = dst_cache_get(&t->dst_cache);
1098
1099 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1100 goto tx_err_link_failure;
1101
1102 if (!dst) {
1103 route_lookup:
1104 /* add dsfield to flowlabel for route lookup */
1105 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1106
1107 dst = ip6_route_output(net, NULL, fl6);
1108
1109 if (dst->error)
1110 goto tx_err_link_failure;
1111 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1112 if (IS_ERR(dst)) {
1113 err = PTR_ERR(dst);
1114 dst = NULL;
1115 goto tx_err_link_failure;
1116 }
1117 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1118 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1119 &fl6->daddr, 0, &fl6->saddr))
1120 goto tx_err_link_failure;
1121 ndst = dst;
1122 }
1123
1124 tdev = dst->dev;
1125
1126 if (tdev == dev) {
1127 stats->collisions++;
1128 net_warn_ratelimited("%s: Local routing loop detected!\n",
1129 t->parms.name);
1130 goto tx_err_dst_release;
1131 }
1132 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1133 if (encap_limit >= 0) {
1134 max_headroom += 8;
1135 mtu -= 8;
1136 }
1137 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1138 IPV6_MIN_MTU : IPV4_MIN_MTU);
1139
1140 skb_dst_update_pmtu(skb, mtu);
1141 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1142 *pmtu = mtu;
1143 err = -EMSGSIZE;
1144 goto tx_err_dst_release;
1145 }
1146
1147 if (t->err_count > 0) {
1148 if (time_before(jiffies,
1149 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1150 t->err_count--;
1151
1152 dst_link_failure(skb);
1153 } else {
1154 t->err_count = 0;
1155 }
1156 }
1157
1158 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1159
1160 /*
1161 * Okay, now see if we can stuff it in the buffer as-is.
1162 */
1163 max_headroom += LL_RESERVED_SPACE(tdev);
1164
1165 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1166 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1167 struct sk_buff *new_skb;
1168
1169 new_skb = skb_realloc_headroom(skb, max_headroom);
1170 if (!new_skb)
1171 goto tx_err_dst_release;
1172
1173 if (skb->sk)
1174 skb_set_owner_w(new_skb, skb->sk);
1175 consume_skb(skb);
1176 skb = new_skb;
1177 }
1178
1179 if (t->parms.collect_md) {
1180 if (t->encap.type != TUNNEL_ENCAP_NONE)
1181 goto tx_err_dst_release;
1182 } else {
1183 if (use_cache && ndst)
1184 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1185 }
1186 skb_dst_set(skb, dst);
1187
1188 if (hop_limit == 0) {
1189 if (skb->protocol == htons(ETH_P_IP))
1190 hop_limit = ip_hdr(skb)->ttl;
1191 else if (skb->protocol == htons(ETH_P_IPV6))
1192 hop_limit = ipv6_hdr(skb)->hop_limit;
1193 else
1194 hop_limit = ip6_dst_hoplimit(dst);
1195 }
1196
1197 /* Calculate max headroom for all the headers and adjust
1198 * needed_headroom if necessary.
1199 */
1200 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1201 + dst->header_len + t->hlen;
1202 if (max_headroom > dev->needed_headroom)
1203 dev->needed_headroom = max_headroom;
1204
1205 err = ip6_tnl_encap(skb, t, &proto, fl6);
1206 if (err)
1207 return err;
1208
1209 if (encap_limit >= 0) {
1210 init_tel_txopt(&opt, encap_limit);
1211 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1212 }
1213
1214 skb_push(skb, sizeof(struct ipv6hdr));
1215 skb_reset_network_header(skb);
1216 ipv6h = ipv6_hdr(skb);
1217 ip6_flow_hdr(ipv6h, dsfield,
1218 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1219 ipv6h->hop_limit = hop_limit;
1220 ipv6h->nexthdr = proto;
1221 ipv6h->saddr = fl6->saddr;
1222 ipv6h->daddr = fl6->daddr;
1223 ip6tunnel_xmit(NULL, skb, dev);
1224 return 0;
1225 tx_err_link_failure:
1226 stats->tx_carrier_errors++;
1227 dst_link_failure(skb);
1228 tx_err_dst_release:
1229 dst_release(dst);
1230 return err;
1231 }
1232 EXPORT_SYMBOL(ip6_tnl_xmit);
1233
1234 static inline int
1235 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1236 {
1237 struct ip6_tnl *t = netdev_priv(dev);
1238 const struct iphdr *iph;
1239 int encap_limit = -1;
1240 struct flowi6 fl6;
1241 __u8 dsfield;
1242 __u32 mtu;
1243 u8 tproto;
1244 int err;
1245
1246 iph = ip_hdr(skb);
1247 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1248
1249 tproto = READ_ONCE(t->parms.proto);
1250 if (tproto != IPPROTO_IPIP && tproto != 0)
1251 return -1;
1252
1253 if (t->parms.collect_md) {
1254 struct ip_tunnel_info *tun_info;
1255 const struct ip_tunnel_key *key;
1256
1257 tun_info = skb_tunnel_info(skb);
1258 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1259 ip_tunnel_info_af(tun_info) != AF_INET6))
1260 return -1;
1261 key = &tun_info->key;
1262 memset(&fl6, 0, sizeof(fl6));
1263 fl6.flowi6_proto = IPPROTO_IPIP;
1264 fl6.saddr = key->u.ipv6.src;
1265 fl6.daddr = key->u.ipv6.dst;
1266 fl6.flowlabel = key->label;
1267 dsfield = key->tos;
1268 } else {
1269 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1270 encap_limit = t->parms.encap_limit;
1271
1272 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1273 fl6.flowi6_proto = IPPROTO_IPIP;
1274
1275 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1276 dsfield = ipv4_get_dsfield(iph);
1277 else
1278 dsfield = ip6_tclass(t->parms.flowinfo);
1279 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1280 fl6.flowi6_mark = skb->mark;
1281 else
1282 fl6.flowi6_mark = t->parms.fwmark;
1283 }
1284
1285 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1286
1287 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1288 return -1;
1289
1290 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1291
1292 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1293
1294 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1295 IPPROTO_IPIP);
1296 if (err != 0) {
1297 /* XXX: send ICMP error even if DF is not set. */
1298 if (err == -EMSGSIZE)
1299 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1300 htonl(mtu));
1301 return -1;
1302 }
1303
1304 return 0;
1305 }
1306
1307 static inline int
1308 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1309 {
1310 struct ip6_tnl *t = netdev_priv(dev);
1311 struct ipv6hdr *ipv6h;
1312 int encap_limit = -1;
1313 __u16 offset;
1314 struct flowi6 fl6;
1315 __u8 dsfield;
1316 __u32 mtu;
1317 u8 tproto;
1318 int err;
1319
1320 ipv6h = ipv6_hdr(skb);
1321 tproto = READ_ONCE(t->parms.proto);
1322 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1323 ip6_tnl_addr_conflict(t, ipv6h))
1324 return -1;
1325
1326 if (t->parms.collect_md) {
1327 struct ip_tunnel_info *tun_info;
1328 const struct ip_tunnel_key *key;
1329
1330 tun_info = skb_tunnel_info(skb);
1331 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1332 ip_tunnel_info_af(tun_info) != AF_INET6))
1333 return -1;
1334 key = &tun_info->key;
1335 memset(&fl6, 0, sizeof(fl6));
1336 fl6.flowi6_proto = IPPROTO_IPV6;
1337 fl6.saddr = key->u.ipv6.src;
1338 fl6.daddr = key->u.ipv6.dst;
1339 fl6.flowlabel = key->label;
1340 dsfield = key->tos;
1341 } else {
1342 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1343 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1344 ipv6h = ipv6_hdr(skb);
1345 if (offset > 0) {
1346 struct ipv6_tlv_tnl_enc_lim *tel;
1347
1348 tel = (void *)&skb_network_header(skb)[offset];
1349 if (tel->encap_limit == 0) {
1350 icmpv6_send(skb, ICMPV6_PARAMPROB,
1351 ICMPV6_HDR_FIELD, offset + 2);
1352 return -1;
1353 }
1354 encap_limit = tel->encap_limit - 1;
1355 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1356 encap_limit = t->parms.encap_limit;
1357 }
1358
1359 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1360 fl6.flowi6_proto = IPPROTO_IPV6;
1361
1362 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1363 dsfield = ipv6_get_dsfield(ipv6h);
1364 else
1365 dsfield = ip6_tclass(t->parms.flowinfo);
1366 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1367 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1368 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1369 fl6.flowi6_mark = skb->mark;
1370 else
1371 fl6.flowi6_mark = t->parms.fwmark;
1372 }
1373
1374 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1375
1376 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1377 return -1;
1378
1379 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1380
1381 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1382
1383 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1384 IPPROTO_IPV6);
1385 if (err != 0) {
1386 if (err == -EMSGSIZE)
1387 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1388 return -1;
1389 }
1390
1391 return 0;
1392 }
1393
1394 static netdev_tx_t
1395 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1396 {
1397 struct ip6_tnl *t = netdev_priv(dev);
1398 struct net_device_stats *stats = &t->dev->stats;
1399 int ret;
1400
1401 if (!pskb_inet_may_pull(skb))
1402 goto tx_err;
1403
1404 switch (skb->protocol) {
1405 case htons(ETH_P_IP):
1406 ret = ip4ip6_tnl_xmit(skb, dev);
1407 break;
1408 case htons(ETH_P_IPV6):
1409 ret = ip6ip6_tnl_xmit(skb, dev);
1410 break;
1411 default:
1412 goto tx_err;
1413 }
1414
1415 if (ret < 0)
1416 goto tx_err;
1417
1418 return NETDEV_TX_OK;
1419
1420 tx_err:
1421 stats->tx_errors++;
1422 stats->tx_dropped++;
1423 kfree_skb(skb);
1424 return NETDEV_TX_OK;
1425 }
1426
1427 static void ip6_tnl_link_config(struct ip6_tnl *t)
1428 {
1429 struct net_device *dev = t->dev;
1430 struct __ip6_tnl_parm *p = &t->parms;
1431 struct flowi6 *fl6 = &t->fl.u.ip6;
1432 int t_hlen;
1433
1434 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1435 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1436
1437 /* Set up flowi template */
1438 fl6->saddr = p->laddr;
1439 fl6->daddr = p->raddr;
1440 fl6->flowi6_oif = p->link;
1441 fl6->flowlabel = 0;
1442
1443 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1444 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1445 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1446 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1447
1448 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1449 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1450
1451 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1452 dev->flags |= IFF_POINTOPOINT;
1453 else
1454 dev->flags &= ~IFF_POINTOPOINT;
1455
1456 t->tun_hlen = 0;
1457 t->hlen = t->encap_hlen + t->tun_hlen;
1458 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1459
1460 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1461 int strict = (ipv6_addr_type(&p->raddr) &
1462 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1463
1464 struct rt6_info *rt = rt6_lookup(t->net,
1465 &p->raddr, &p->laddr,
1466 p->link, NULL, strict);
1467
1468 if (!rt)
1469 return;
1470
1471 if (rt->dst.dev) {
1472 dev->hard_header_len = rt->dst.dev->hard_header_len +
1473 t_hlen;
1474
1475 dev->mtu = rt->dst.dev->mtu - t_hlen;
1476 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1477 dev->mtu -= 8;
1478
1479 if (dev->mtu < IPV6_MIN_MTU)
1480 dev->mtu = IPV6_MIN_MTU;
1481 }
1482 ip6_rt_put(rt);
1483 }
1484 }
1485
1486 /**
1487 * ip6_tnl_change - update the tunnel parameters
1488 * @t: tunnel to be changed
1489 * @p: tunnel configuration parameters
1490 *
1491 * Description:
1492 * ip6_tnl_change() updates the tunnel parameters
1493 **/
1494
1495 static int
1496 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1497 {
1498 t->parms.laddr = p->laddr;
1499 t->parms.raddr = p->raddr;
1500 t->parms.flags = p->flags;
1501 t->parms.hop_limit = p->hop_limit;
1502 t->parms.encap_limit = p->encap_limit;
1503 t->parms.flowinfo = p->flowinfo;
1504 t->parms.link = p->link;
1505 t->parms.proto = p->proto;
1506 t->parms.fwmark = p->fwmark;
1507 dst_cache_reset(&t->dst_cache);
1508 ip6_tnl_link_config(t);
1509 return 0;
1510 }
1511
1512 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1513 {
1514 struct net *net = t->net;
1515 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1516 int err;
1517
1518 ip6_tnl_unlink(ip6n, t);
1519 synchronize_net();
1520 err = ip6_tnl_change(t, p);
1521 ip6_tnl_link(ip6n, t);
1522 netdev_state_change(t->dev);
1523 return err;
1524 }
1525
1526 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1527 {
1528 /* for default tnl0 device allow to change only the proto */
1529 t->parms.proto = p->proto;
1530 netdev_state_change(t->dev);
1531 return 0;
1532 }
1533
1534 static void
1535 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1536 {
1537 p->laddr = u->laddr;
1538 p->raddr = u->raddr;
1539 p->flags = u->flags;
1540 p->hop_limit = u->hop_limit;
1541 p->encap_limit = u->encap_limit;
1542 p->flowinfo = u->flowinfo;
1543 p->link = u->link;
1544 p->proto = u->proto;
1545 memcpy(p->name, u->name, sizeof(u->name));
1546 }
1547
1548 static void
1549 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1550 {
1551 u->laddr = p->laddr;
1552 u->raddr = p->raddr;
1553 u->flags = p->flags;
1554 u->hop_limit = p->hop_limit;
1555 u->encap_limit = p->encap_limit;
1556 u->flowinfo = p->flowinfo;
1557 u->link = p->link;
1558 u->proto = p->proto;
1559 memcpy(u->name, p->name, sizeof(u->name));
1560 }
1561
1562 /**
1563 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1564 * @dev: virtual device associated with tunnel
1565 * @ifr: parameters passed from userspace
1566 * @cmd: command to be performed
1567 *
1568 * Description:
1569 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1570 * from userspace.
1571 *
1572 * The possible commands are the following:
1573 * %SIOCGETTUNNEL: get tunnel parameters for device
1574 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1575 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1576 * %SIOCDELTUNNEL: delete tunnel
1577 *
1578 * The fallback device "ip6tnl0", created during module
1579 * initialization, can be used for creating other tunnel devices.
1580 *
1581 * Return:
1582 * 0 on success,
1583 * %-EFAULT if unable to copy data to or from userspace,
1584 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1585 * %-EINVAL if passed tunnel parameters are invalid,
1586 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1587 * %-ENODEV if attempting to change or delete a nonexisting device
1588 **/
1589
1590 static int
1591 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1592 {
1593 int err = 0;
1594 struct ip6_tnl_parm p;
1595 struct __ip6_tnl_parm p1;
1596 struct ip6_tnl *t = netdev_priv(dev);
1597 struct net *net = t->net;
1598 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1599
1600 memset(&p1, 0, sizeof(p1));
1601
1602 switch (cmd) {
1603 case SIOCGETTUNNEL:
1604 if (dev == ip6n->fb_tnl_dev) {
1605 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1606 err = -EFAULT;
1607 break;
1608 }
1609 ip6_tnl_parm_from_user(&p1, &p);
1610 t = ip6_tnl_locate(net, &p1, 0);
1611 if (IS_ERR(t))
1612 t = netdev_priv(dev);
1613 } else {
1614 memset(&p, 0, sizeof(p));
1615 }
1616 ip6_tnl_parm_to_user(&p, &t->parms);
1617 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1618 err = -EFAULT;
1619 }
1620 break;
1621 case SIOCADDTUNNEL:
1622 case SIOCCHGTUNNEL:
1623 err = -EPERM;
1624 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1625 break;
1626 err = -EFAULT;
1627 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1628 break;
1629 err = -EINVAL;
1630 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1631 p.proto != 0)
1632 break;
1633 ip6_tnl_parm_from_user(&p1, &p);
1634 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1635 if (cmd == SIOCCHGTUNNEL) {
1636 if (!IS_ERR(t)) {
1637 if (t->dev != dev) {
1638 err = -EEXIST;
1639 break;
1640 }
1641 } else
1642 t = netdev_priv(dev);
1643 if (dev == ip6n->fb_tnl_dev)
1644 err = ip6_tnl0_update(t, &p1);
1645 else
1646 err = ip6_tnl_update(t, &p1);
1647 }
1648 if (!IS_ERR(t)) {
1649 err = 0;
1650 ip6_tnl_parm_to_user(&p, &t->parms);
1651 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1652 err = -EFAULT;
1653
1654 } else {
1655 err = PTR_ERR(t);
1656 }
1657 break;
1658 case SIOCDELTUNNEL:
1659 err = -EPERM;
1660 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1661 break;
1662
1663 if (dev == ip6n->fb_tnl_dev) {
1664 err = -EFAULT;
1665 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1666 break;
1667 err = -ENOENT;
1668 ip6_tnl_parm_from_user(&p1, &p);
1669 t = ip6_tnl_locate(net, &p1, 0);
1670 if (IS_ERR(t))
1671 break;
1672 err = -EPERM;
1673 if (t->dev == ip6n->fb_tnl_dev)
1674 break;
1675 dev = t->dev;
1676 }
1677 err = 0;
1678 unregister_netdevice(dev);
1679 break;
1680 default:
1681 err = -EINVAL;
1682 }
1683 return err;
1684 }
1685
1686 /**
1687 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1688 * @dev: virtual device associated with tunnel
1689 * @new_mtu: the new mtu
1690 *
1691 * Return:
1692 * 0 on success,
1693 * %-EINVAL if mtu too small
1694 **/
1695
1696 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1697 {
1698 struct ip6_tnl *tnl = netdev_priv(dev);
1699
1700 if (tnl->parms.proto == IPPROTO_IPV6) {
1701 if (new_mtu < IPV6_MIN_MTU)
1702 return -EINVAL;
1703 } else {
1704 if (new_mtu < ETH_MIN_MTU)
1705 return -EINVAL;
1706 }
1707 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1708 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1709 return -EINVAL;
1710 } else {
1711 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1712 return -EINVAL;
1713 }
1714 dev->mtu = new_mtu;
1715 return 0;
1716 }
1717 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1718
1719 int ip6_tnl_get_iflink(const struct net_device *dev)
1720 {
1721 struct ip6_tnl *t = netdev_priv(dev);
1722
1723 return t->parms.link;
1724 }
1725 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1726
1727 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1728 unsigned int num)
1729 {
1730 if (num >= MAX_IPTUN_ENCAP_OPS)
1731 return -ERANGE;
1732
1733 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1734 &ip6tun_encaps[num],
1735 NULL, ops) ? 0 : -1;
1736 }
1737 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1738
1739 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1740 unsigned int num)
1741 {
1742 int ret;
1743
1744 if (num >= MAX_IPTUN_ENCAP_OPS)
1745 return -ERANGE;
1746
1747 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1748 &ip6tun_encaps[num],
1749 ops, NULL) == ops) ? 0 : -1;
1750
1751 synchronize_net();
1752
1753 return ret;
1754 }
1755 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1756
1757 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1758 struct ip_tunnel_encap *ipencap)
1759 {
1760 int hlen;
1761
1762 memset(&t->encap, 0, sizeof(t->encap));
1763
1764 hlen = ip6_encap_hlen(ipencap);
1765 if (hlen < 0)
1766 return hlen;
1767
1768 t->encap.type = ipencap->type;
1769 t->encap.sport = ipencap->sport;
1770 t->encap.dport = ipencap->dport;
1771 t->encap.flags = ipencap->flags;
1772
1773 t->encap_hlen = hlen;
1774 t->hlen = t->encap_hlen + t->tun_hlen;
1775
1776 return 0;
1777 }
1778 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1779
1780 static const struct net_device_ops ip6_tnl_netdev_ops = {
1781 .ndo_init = ip6_tnl_dev_init,
1782 .ndo_uninit = ip6_tnl_dev_uninit,
1783 .ndo_start_xmit = ip6_tnl_start_xmit,
1784 .ndo_do_ioctl = ip6_tnl_ioctl,
1785 .ndo_change_mtu = ip6_tnl_change_mtu,
1786 .ndo_get_stats = ip6_get_stats,
1787 .ndo_get_iflink = ip6_tnl_get_iflink,
1788 };
1789
1790 #define IPXIPX_FEATURES (NETIF_F_SG | \
1791 NETIF_F_FRAGLIST | \
1792 NETIF_F_HIGHDMA | \
1793 NETIF_F_GSO_SOFTWARE | \
1794 NETIF_F_HW_CSUM)
1795
1796 /**
1797 * ip6_tnl_dev_setup - setup virtual tunnel device
1798 * @dev: virtual device associated with tunnel
1799 *
1800 * Description:
1801 * Initialize function pointers and device parameters
1802 **/
1803
1804 static void ip6_tnl_dev_setup(struct net_device *dev)
1805 {
1806 dev->netdev_ops = &ip6_tnl_netdev_ops;
1807 dev->needs_free_netdev = true;
1808 dev->priv_destructor = ip6_dev_free;
1809
1810 dev->type = ARPHRD_TUNNEL6;
1811 dev->flags |= IFF_NOARP;
1812 dev->addr_len = sizeof(struct in6_addr);
1813 dev->features |= NETIF_F_LLTX;
1814 netif_keep_dst(dev);
1815
1816 dev->features |= IPXIPX_FEATURES;
1817 dev->hw_features |= IPXIPX_FEATURES;
1818
1819 /* This perm addr will be used as interface identifier by IPv6 */
1820 dev->addr_assign_type = NET_ADDR_RANDOM;
1821 eth_random_addr(dev->perm_addr);
1822 }
1823
1824
1825 /**
1826 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1827 * @dev: virtual device associated with tunnel
1828 **/
1829
1830 static inline int
1831 ip6_tnl_dev_init_gen(struct net_device *dev)
1832 {
1833 struct ip6_tnl *t = netdev_priv(dev);
1834 int ret;
1835 int t_hlen;
1836
1837 t->dev = dev;
1838 t->net = dev_net(dev);
1839 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1840 if (!dev->tstats)
1841 return -ENOMEM;
1842
1843 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1844 if (ret)
1845 goto free_stats;
1846
1847 ret = gro_cells_init(&t->gro_cells, dev);
1848 if (ret)
1849 goto destroy_dst;
1850
1851 t->tun_hlen = 0;
1852 t->hlen = t->encap_hlen + t->tun_hlen;
1853 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1854
1855 dev->type = ARPHRD_TUNNEL6;
1856 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1857 dev->mtu = ETH_DATA_LEN - t_hlen;
1858 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1859 dev->mtu -= 8;
1860 dev->min_mtu = ETH_MIN_MTU;
1861 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1862
1863 return 0;
1864
1865 destroy_dst:
1866 dst_cache_destroy(&t->dst_cache);
1867 free_stats:
1868 free_percpu(dev->tstats);
1869 dev->tstats = NULL;
1870
1871 return ret;
1872 }
1873
1874 /**
1875 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1876 * @dev: virtual device associated with tunnel
1877 **/
1878
1879 static int ip6_tnl_dev_init(struct net_device *dev)
1880 {
1881 struct ip6_tnl *t = netdev_priv(dev);
1882 int err = ip6_tnl_dev_init_gen(dev);
1883
1884 if (err)
1885 return err;
1886 ip6_tnl_link_config(t);
1887 if (t->parms.collect_md) {
1888 dev->features |= NETIF_F_NETNS_LOCAL;
1889 netif_keep_dst(dev);
1890 }
1891 return 0;
1892 }
1893
1894 /**
1895 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1896 * @dev: fallback device
1897 *
1898 * Return: 0
1899 **/
1900
1901 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1902 {
1903 struct ip6_tnl *t = netdev_priv(dev);
1904 struct net *net = dev_net(dev);
1905 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1906
1907 t->parms.proto = IPPROTO_IPV6;
1908 dev_hold(dev);
1909
1910 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1911 return 0;
1912 }
1913
1914 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1915 struct netlink_ext_ack *extack)
1916 {
1917 u8 proto;
1918
1919 if (!data || !data[IFLA_IPTUN_PROTO])
1920 return 0;
1921
1922 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1923 if (proto != IPPROTO_IPV6 &&
1924 proto != IPPROTO_IPIP &&
1925 proto != 0)
1926 return -EINVAL;
1927
1928 return 0;
1929 }
1930
1931 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1932 struct __ip6_tnl_parm *parms)
1933 {
1934 memset(parms, 0, sizeof(*parms));
1935
1936 if (!data)
1937 return;
1938
1939 if (data[IFLA_IPTUN_LINK])
1940 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1941
1942 if (data[IFLA_IPTUN_LOCAL])
1943 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1944
1945 if (data[IFLA_IPTUN_REMOTE])
1946 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1947
1948 if (data[IFLA_IPTUN_TTL])
1949 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1950
1951 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1952 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1953
1954 if (data[IFLA_IPTUN_FLOWINFO])
1955 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1956
1957 if (data[IFLA_IPTUN_FLAGS])
1958 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1959
1960 if (data[IFLA_IPTUN_PROTO])
1961 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1962
1963 if (data[IFLA_IPTUN_COLLECT_METADATA])
1964 parms->collect_md = true;
1965
1966 if (data[IFLA_IPTUN_FWMARK])
1967 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1968 }
1969
1970 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1971 struct ip_tunnel_encap *ipencap)
1972 {
1973 bool ret = false;
1974
1975 memset(ipencap, 0, sizeof(*ipencap));
1976
1977 if (!data)
1978 return ret;
1979
1980 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
1981 ret = true;
1982 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
1983 }
1984
1985 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
1986 ret = true;
1987 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
1988 }
1989
1990 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
1991 ret = true;
1992 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
1993 }
1994
1995 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
1996 ret = true;
1997 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
1998 }
1999
2000 return ret;
2001 }
2002
2003 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2004 struct nlattr *tb[], struct nlattr *data[],
2005 struct netlink_ext_ack *extack)
2006 {
2007 struct net *net = dev_net(dev);
2008 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2009 struct ip_tunnel_encap ipencap;
2010 struct ip6_tnl *nt, *t;
2011 int err;
2012
2013 nt = netdev_priv(dev);
2014
2015 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2016 err = ip6_tnl_encap_setup(nt, &ipencap);
2017 if (err < 0)
2018 return err;
2019 }
2020
2021 ip6_tnl_netlink_parms(data, &nt->parms);
2022
2023 if (nt->parms.collect_md) {
2024 if (rtnl_dereference(ip6n->collect_md_tun))
2025 return -EEXIST;
2026 } else {
2027 t = ip6_tnl_locate(net, &nt->parms, 0);
2028 if (!IS_ERR(t))
2029 return -EEXIST;
2030 }
2031
2032 err = ip6_tnl_create2(dev);
2033 if (!err && tb[IFLA_MTU])
2034 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2035
2036 return err;
2037 }
2038
2039 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2040 struct nlattr *data[],
2041 struct netlink_ext_ack *extack)
2042 {
2043 struct ip6_tnl *t = netdev_priv(dev);
2044 struct __ip6_tnl_parm p;
2045 struct net *net = t->net;
2046 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2047 struct ip_tunnel_encap ipencap;
2048
2049 if (dev == ip6n->fb_tnl_dev)
2050 return -EINVAL;
2051
2052 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2053 int err = ip6_tnl_encap_setup(t, &ipencap);
2054
2055 if (err < 0)
2056 return err;
2057 }
2058 ip6_tnl_netlink_parms(data, &p);
2059 if (p.collect_md)
2060 return -EINVAL;
2061
2062 t = ip6_tnl_locate(net, &p, 0);
2063 if (!IS_ERR(t)) {
2064 if (t->dev != dev)
2065 return -EEXIST;
2066 } else
2067 t = netdev_priv(dev);
2068
2069 return ip6_tnl_update(t, &p);
2070 }
2071
2072 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2073 {
2074 struct net *net = dev_net(dev);
2075 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2076
2077 if (dev != ip6n->fb_tnl_dev)
2078 unregister_netdevice_queue(dev, head);
2079 }
2080
2081 static size_t ip6_tnl_get_size(const struct net_device *dev)
2082 {
2083 return
2084 /* IFLA_IPTUN_LINK */
2085 nla_total_size(4) +
2086 /* IFLA_IPTUN_LOCAL */
2087 nla_total_size(sizeof(struct in6_addr)) +
2088 /* IFLA_IPTUN_REMOTE */
2089 nla_total_size(sizeof(struct in6_addr)) +
2090 /* IFLA_IPTUN_TTL */
2091 nla_total_size(1) +
2092 /* IFLA_IPTUN_ENCAP_LIMIT */
2093 nla_total_size(1) +
2094 /* IFLA_IPTUN_FLOWINFO */
2095 nla_total_size(4) +
2096 /* IFLA_IPTUN_FLAGS */
2097 nla_total_size(4) +
2098 /* IFLA_IPTUN_PROTO */
2099 nla_total_size(1) +
2100 /* IFLA_IPTUN_ENCAP_TYPE */
2101 nla_total_size(2) +
2102 /* IFLA_IPTUN_ENCAP_FLAGS */
2103 nla_total_size(2) +
2104 /* IFLA_IPTUN_ENCAP_SPORT */
2105 nla_total_size(2) +
2106 /* IFLA_IPTUN_ENCAP_DPORT */
2107 nla_total_size(2) +
2108 /* IFLA_IPTUN_COLLECT_METADATA */
2109 nla_total_size(0) +
2110 /* IFLA_IPTUN_FWMARK */
2111 nla_total_size(4) +
2112 0;
2113 }
2114
2115 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2116 {
2117 struct ip6_tnl *tunnel = netdev_priv(dev);
2118 struct __ip6_tnl_parm *parm = &tunnel->parms;
2119
2120 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2121 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2122 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2123 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2124 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2125 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2126 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2127 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2128 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2129 goto nla_put_failure;
2130
2131 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2132 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2133 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2134 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2135 goto nla_put_failure;
2136
2137 if (parm->collect_md)
2138 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2139 goto nla_put_failure;
2140
2141 return 0;
2142
2143 nla_put_failure:
2144 return -EMSGSIZE;
2145 }
2146
2147 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2148 {
2149 struct ip6_tnl *tunnel = netdev_priv(dev);
2150
2151 return tunnel->net;
2152 }
2153 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2154
2155 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2156 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2157 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2158 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2159 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2160 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2161 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2162 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2163 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2164 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2165 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2166 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2167 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2168 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2169 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2170 };
2171
2172 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2173 .kind = "ip6tnl",
2174 .maxtype = IFLA_IPTUN_MAX,
2175 .policy = ip6_tnl_policy,
2176 .priv_size = sizeof(struct ip6_tnl),
2177 .setup = ip6_tnl_dev_setup,
2178 .validate = ip6_tnl_validate,
2179 .newlink = ip6_tnl_newlink,
2180 .changelink = ip6_tnl_changelink,
2181 .dellink = ip6_tnl_dellink,
2182 .get_size = ip6_tnl_get_size,
2183 .fill_info = ip6_tnl_fill_info,
2184 .get_link_net = ip6_tnl_get_link_net,
2185 };
2186
2187 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2188 .handler = ip4ip6_rcv,
2189 .err_handler = ip4ip6_err,
2190 .priority = 1,
2191 };
2192
2193 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2194 .handler = ip6ip6_rcv,
2195 .err_handler = ip6ip6_err,
2196 .priority = 1,
2197 };
2198
2199 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2200 {
2201 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2202 struct net_device *dev, *aux;
2203 int h;
2204 struct ip6_tnl *t;
2205
2206 for_each_netdev_safe(net, dev, aux)
2207 if (dev->rtnl_link_ops == &ip6_link_ops)
2208 unregister_netdevice_queue(dev, list);
2209
2210 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2211 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2212 while (t) {
2213 /* If dev is in the same netns, it has already
2214 * been added to the list by the previous loop.
2215 */
2216 if (!net_eq(dev_net(t->dev), net))
2217 unregister_netdevice_queue(t->dev, list);
2218 t = rtnl_dereference(t->next);
2219 }
2220 }
2221 }
2222
2223 static int __net_init ip6_tnl_init_net(struct net *net)
2224 {
2225 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2226 struct ip6_tnl *t = NULL;
2227 int err;
2228
2229 ip6n->tnls[0] = ip6n->tnls_wc;
2230 ip6n->tnls[1] = ip6n->tnls_r_l;
2231
2232 if (!net_has_fallback_tunnels(net))
2233 return 0;
2234 err = -ENOMEM;
2235 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2236 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2237
2238 if (!ip6n->fb_tnl_dev)
2239 goto err_alloc_dev;
2240 dev_net_set(ip6n->fb_tnl_dev, net);
2241 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2242 /* FB netdevice is special: we have one, and only one per netns.
2243 * Allowing to move it to another netns is clearly unsafe.
2244 */
2245 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2246
2247 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2248 if (err < 0)
2249 goto err_register;
2250
2251 err = register_netdev(ip6n->fb_tnl_dev);
2252 if (err < 0)
2253 goto err_register;
2254
2255 t = netdev_priv(ip6n->fb_tnl_dev);
2256
2257 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2258 return 0;
2259
2260 err_register:
2261 free_netdev(ip6n->fb_tnl_dev);
2262 err_alloc_dev:
2263 return err;
2264 }
2265
2266 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2267 {
2268 struct net *net;
2269 LIST_HEAD(list);
2270
2271 rtnl_lock();
2272 list_for_each_entry(net, net_list, exit_list)
2273 ip6_tnl_destroy_tunnels(net, &list);
2274 unregister_netdevice_many(&list);
2275 rtnl_unlock();
2276 }
2277
2278 static struct pernet_operations ip6_tnl_net_ops = {
2279 .init = ip6_tnl_init_net,
2280 .exit_batch = ip6_tnl_exit_batch_net,
2281 .id = &ip6_tnl_net_id,
2282 .size = sizeof(struct ip6_tnl_net),
2283 };
2284
2285 /**
2286 * ip6_tunnel_init - register protocol and reserve needed resources
2287 *
2288 * Return: 0 on success
2289 **/
2290
2291 static int __init ip6_tunnel_init(void)
2292 {
2293 int err;
2294
2295 if (!ipv6_mod_enabled())
2296 return -EOPNOTSUPP;
2297
2298 err = register_pernet_device(&ip6_tnl_net_ops);
2299 if (err < 0)
2300 goto out_pernet;
2301
2302 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2303 if (err < 0) {
2304 pr_err("%s: can't register ip4ip6\n", __func__);
2305 goto out_ip4ip6;
2306 }
2307
2308 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2309 if (err < 0) {
2310 pr_err("%s: can't register ip6ip6\n", __func__);
2311 goto out_ip6ip6;
2312 }
2313 err = rtnl_link_register(&ip6_link_ops);
2314 if (err < 0)
2315 goto rtnl_link_failed;
2316
2317 return 0;
2318
2319 rtnl_link_failed:
2320 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2321 out_ip6ip6:
2322 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2323 out_ip4ip6:
2324 unregister_pernet_device(&ip6_tnl_net_ops);
2325 out_pernet:
2326 return err;
2327 }
2328
2329 /**
2330 * ip6_tunnel_cleanup - free resources and unregister protocol
2331 **/
2332
2333 static void __exit ip6_tunnel_cleanup(void)
2334 {
2335 rtnl_link_unregister(&ip6_link_ops);
2336 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2337 pr_info("%s: can't deregister ip4ip6\n", __func__);
2338
2339 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2340 pr_info("%s: can't deregister ip6ip6\n", __func__);
2341
2342 unregister_pernet_device(&ip6_tnl_net_ops);
2343 }
2344
2345 module_init(ip6_tunnel_init);
2346 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support