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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / net / ipv6 / ip6_tunnel.c
blob4703b09808d0af016ae566a5be5cb490c7179d38
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 tunneling device
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Ville Nuorvala <vnuorval@tcs.hut.fi>
8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org>
9 *
10 * Based on:
11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
12 *
13 * RFC 2473
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/capability.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/sockios.h>
23 #include <linux/icmp.h>
24 #include <linux/if.h>
25 #include <linux/in.h>
26 #include <linux/ip.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/icmpv6.h>
32 #include <linux/init.h>
33 #include <linux/route.h>
34 #include <linux/rtnetlink.h>
35 #include <linux/netfilter_ipv6.h>
36 #include <linux/slab.h>
37 #include <linux/hash.h>
38 #include <linux/etherdevice.h>
39
40 #include <linux/uaccess.h>
41 #include <linux/atomic.h>
42
43 #include <net/icmp.h>
44 #include <net/ip.h>
45 #include <net/ip_tunnels.h>
46 #include <net/ipv6.h>
47 #include <net/ip6_route.h>
48 #include <net/addrconf.h>
49 #include <net/ip6_tunnel.h>
50 #include <net/xfrm.h>
51 #include <net/dsfield.h>
52 #include <net/inet_ecn.h>
53 #include <net/net_namespace.h>
54 #include <net/netns/generic.h>
55 #include <net/dst_metadata.h>
56
57 MODULE_AUTHOR("Ville Nuorvala");
58 MODULE_DESCRIPTION("IPv6 tunneling device");
59 MODULE_LICENSE("GPL");
60 MODULE_ALIAS_RTNL_LINK("ip6tnl");
61 MODULE_ALIAS_NETDEV("ip6tnl0");
62
63 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5
64 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
65
66 static bool log_ecn_error = true;
67 module_param(log_ecn_error, bool, 0644);
68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
69
70 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
71 {
72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
73
74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
75 }
76
77 static int ip6_tnl_dev_init(struct net_device *dev);
78 static void ip6_tnl_dev_setup(struct net_device *dev);
79 static struct rtnl_link_ops ip6_link_ops __read_mostly;
80
81 static unsigned int ip6_tnl_net_id __read_mostly;
82 struct ip6_tnl_net {
83 /* the IPv6 tunnel fallback device */
84 struct net_device *fb_tnl_dev;
85 /* lists for storing tunnels in use */
86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
87 struct ip6_tnl __rcu *tnls_wc[1];
88 struct ip6_tnl __rcu **tnls[2];
89 struct ip6_tnl __rcu *collect_md_tun;
90 };
91
92 static struct net_device_stats *ip6_get_stats(struct net_device *dev)
93 {
94 struct pcpu_sw_netstats tmp, sum = { 0 };
95 int i;
96
97 for_each_possible_cpu(i) {
98 unsigned int start;
99 const struct pcpu_sw_netstats *tstats =
100 per_cpu_ptr(dev->tstats, i);
101
102 do {
103 start = u64_stats_fetch_begin_irq(&tstats->syncp);
104 tmp.rx_packets = tstats->rx_packets;
105 tmp.rx_bytes = tstats->rx_bytes;
106 tmp.tx_packets = tstats->tx_packets;
107 tmp.tx_bytes = tstats->tx_bytes;
108 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
109
110 sum.rx_packets += tmp.rx_packets;
111 sum.rx_bytes += tmp.rx_bytes;
112 sum.tx_packets += tmp.tx_packets;
113 sum.tx_bytes += tmp.tx_bytes;
114 }
115 dev->stats.rx_packets = sum.rx_packets;
116 dev->stats.rx_bytes = sum.rx_bytes;
117 dev->stats.tx_packets = sum.tx_packets;
118 dev->stats.tx_bytes = sum.tx_bytes;
119 return &dev->stats;
120 }
121
122 /**
123 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses
124 * @link: ifindex of underlying interface
125 * @remote: the address of the tunnel exit-point
126 * @local: the address of the tunnel entry-point
127 *
128 * Return:
129 * tunnel matching given end-points if found,
130 * else fallback tunnel if its device is up,
131 * else %NULL
132 **/
133
134 #define for_each_ip6_tunnel_rcu(start) \
135 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
136
137 static struct ip6_tnl *
138 ip6_tnl_lookup(struct net *net, int link,
139 const struct in6_addr *remote, const struct in6_addr *local)
140 {
141 unsigned int hash = HASH(remote, local);
142 struct ip6_tnl *t, *cand = NULL;
143 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
144 struct in6_addr any;
145
146 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
147 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
148 !ipv6_addr_equal(remote, &t->parms.raddr) ||
149 !(t->dev->flags & IFF_UP))
150 continue;
151
152 if (link == t->parms.link)
153 return t;
154 else
155 cand = t;
156 }
157
158 memset(&any, 0, sizeof(any));
159 hash = HASH(&any, local);
160 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
161 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
162 !ipv6_addr_any(&t->parms.raddr) ||
163 !(t->dev->flags & IFF_UP))
164 continue;
165
166 if (link == t->parms.link)
167 return t;
168 else if (!cand)
169 cand = t;
170 }
171
172 hash = HASH(remote, &any);
173 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
174 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
175 !ipv6_addr_any(&t->parms.laddr) ||
176 !(t->dev->flags & IFF_UP))
177 continue;
178
179 if (link == t->parms.link)
180 return t;
181 else if (!cand)
182 cand = t;
183 }
184
185 if (cand)
186 return cand;
187
188 t = rcu_dereference(ip6n->collect_md_tun);
189 if (t && t->dev->flags & IFF_UP)
190 return t;
191
192 t = rcu_dereference(ip6n->tnls_wc[0]);
193 if (t && (t->dev->flags & IFF_UP))
194 return t;
195
196 return NULL;
197 }
198
199 /**
200 * ip6_tnl_bucket - get head of list matching given tunnel parameters
201 * @p: parameters containing tunnel end-points
202 *
203 * Description:
204 * ip6_tnl_bucket() returns the head of the list matching the
205 * &struct in6_addr entries laddr and raddr in @p.
206 *
207 * Return: head of IPv6 tunnel list
208 **/
209
210 static struct ip6_tnl __rcu **
211 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p)
212 {
213 const struct in6_addr *remote = &p->raddr;
214 const struct in6_addr *local = &p->laddr;
215 unsigned int h = 0;
216 int prio = 0;
217
218 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
219 prio = 1;
220 h = HASH(remote, local);
221 }
222 return &ip6n->tnls[prio][h];
223 }
224
225 /**
226 * ip6_tnl_link - add tunnel to hash table
227 * @t: tunnel to be added
228 **/
229
230 static void
231 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
232 {
233 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
234
235 if (t->parms.collect_md)
236 rcu_assign_pointer(ip6n->collect_md_tun, t);
237 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
238 rcu_assign_pointer(*tp, t);
239 }
240
241 /**
242 * ip6_tnl_unlink - remove tunnel from hash table
243 * @t: tunnel to be removed
244 **/
245
246 static void
247 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
248 {
249 struct ip6_tnl __rcu **tp;
250 struct ip6_tnl *iter;
251
252 if (t->parms.collect_md)
253 rcu_assign_pointer(ip6n->collect_md_tun, NULL);
254
255 for (tp = ip6_tnl_bucket(ip6n, &t->parms);
256 (iter = rtnl_dereference(*tp)) != NULL;
257 tp = &iter->next) {
258 if (t == iter) {
259 rcu_assign_pointer(*tp, t->next);
260 break;
261 }
262 }
263 }
264
265 static void ip6_dev_free(struct net_device *dev)
266 {
267 struct ip6_tnl *t = netdev_priv(dev);
268
269 gro_cells_destroy(&t->gro_cells);
270 dst_cache_destroy(&t->dst_cache);
271 free_percpu(dev->tstats);
272 }
273
274 static int ip6_tnl_create2(struct net_device *dev)
275 {
276 struct ip6_tnl *t = netdev_priv(dev);
277 struct net *net = dev_net(dev);
278 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
279 int err;
280
281 t = netdev_priv(dev);
282
283 dev->rtnl_link_ops = &ip6_link_ops;
284 err = register_netdevice(dev);
285 if (err < 0)
286 goto out;
287
288 strcpy(t->parms.name, dev->name);
289
290 dev_hold(dev);
291 ip6_tnl_link(ip6n, t);
292 return 0;
293
294 out:
295 return err;
296 }
297
298 /**
299 * ip6_tnl_create - create a new tunnel
300 * @p: tunnel parameters
301 * @pt: pointer to new tunnel
302 *
303 * Description:
304 * Create tunnel matching given parameters.
305 *
306 * Return:
307 * created tunnel or error pointer
308 **/
309
310 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
311 {
312 struct net_device *dev;
313 struct ip6_tnl *t;
314 char name[IFNAMSIZ];
315 int err = -E2BIG;
316
317 if (p->name[0]) {
318 if (!dev_valid_name(p->name))
319 goto failed;
320 strlcpy(name, p->name, IFNAMSIZ);
321 } else {
322 sprintf(name, "ip6tnl%%d");
323 }
324 err = -ENOMEM;
325 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
326 ip6_tnl_dev_setup);
327 if (!dev)
328 goto failed;
329
330 dev_net_set(dev, net);
331
332 t = netdev_priv(dev);
333 t->parms = *p;
334 t->net = dev_net(dev);
335 err = ip6_tnl_create2(dev);
336 if (err < 0)
337 goto failed_free;
338
339 return t;
340
341 failed_free:
342 free_netdev(dev);
343 failed:
344 return ERR_PTR(err);
345 }
346
347 /**
348 * ip6_tnl_locate - find or create tunnel matching given parameters
349 * @p: tunnel parameters
350 * @create: != 0 if allowed to create new tunnel if no match found
351 *
352 * Description:
353 * ip6_tnl_locate() first tries to locate an existing tunnel
354 * based on @parms. If this is unsuccessful, but @create is set a new
355 * tunnel device is created and registered for use.
356 *
357 * Return:
358 * matching tunnel or error pointer
359 **/
360
361 static struct ip6_tnl *ip6_tnl_locate(struct net *net,
362 struct __ip6_tnl_parm *p, int create)
363 {
364 const struct in6_addr *remote = &p->raddr;
365 const struct in6_addr *local = &p->laddr;
366 struct ip6_tnl __rcu **tp;
367 struct ip6_tnl *t;
368 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
369
370 for (tp = ip6_tnl_bucket(ip6n, p);
371 (t = rtnl_dereference(*tp)) != NULL;
372 tp = &t->next) {
373 if (ipv6_addr_equal(local, &t->parms.laddr) &&
374 ipv6_addr_equal(remote, &t->parms.raddr) &&
375 p->link == t->parms.link) {
376 if (create)
377 return ERR_PTR(-EEXIST);
378
379 return t;
380 }
381 }
382 if (!create)
383 return ERR_PTR(-ENODEV);
384 return ip6_tnl_create(net, p);
385 }
386
387 /**
388 * ip6_tnl_dev_uninit - tunnel device uninitializer
389 * @dev: the device to be destroyed
390 *
391 * Description:
392 * ip6_tnl_dev_uninit() removes tunnel from its list
393 **/
394
395 static void
396 ip6_tnl_dev_uninit(struct net_device *dev)
397 {
398 struct ip6_tnl *t = netdev_priv(dev);
399 struct net *net = t->net;
400 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
401
402 if (dev == ip6n->fb_tnl_dev)
403 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
404 else
405 ip6_tnl_unlink(ip6n, t);
406 dst_cache_reset(&t->dst_cache);
407 dev_put(dev);
408 }
409
410 /**
411 * parse_tvl_tnl_enc_lim - handle encapsulation limit option
412 * @skb: received socket buffer
413 *
414 * Return:
415 * 0 if none was found,
416 * else index to encapsulation limit
417 **/
418
419 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
420 {
421 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
422 unsigned int nhoff = raw - skb->data;
423 unsigned int off = nhoff + sizeof(*ipv6h);
424 u8 next, nexthdr = ipv6h->nexthdr;
425
426 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
427 struct ipv6_opt_hdr *hdr;
428 u16 optlen;
429
430 if (!pskb_may_pull(skb, off + sizeof(*hdr)))
431 break;
432
433 hdr = (struct ipv6_opt_hdr *)(skb->data + off);
434 if (nexthdr == NEXTHDR_FRAGMENT) {
435 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
436 if (frag_hdr->frag_off)
437 break;
438 optlen = 8;
439 } else if (nexthdr == NEXTHDR_AUTH) {
440 optlen = ipv6_authlen(hdr);
441 } else {
442 optlen = ipv6_optlen(hdr);
443 }
444 /* cache hdr->nexthdr, since pskb_may_pull() might
445 * invalidate hdr
446 */
447 next = hdr->nexthdr;
448 if (nexthdr == NEXTHDR_DEST) {
449 u16 i = 2;
450
451 /* Remember : hdr is no longer valid at this point. */
452 if (!pskb_may_pull(skb, off + optlen))
453 break;
454
455 while (1) {
456 struct ipv6_tlv_tnl_enc_lim *tel;
457
458 /* No more room for encapsulation limit */
459 if (i + sizeof(*tel) > optlen)
460 break;
461
462 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
463 /* return index of option if found and valid */
464 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
465 tel->length == 1)
466 return i + off - nhoff;
467 /* else jump to next option */
468 if (tel->type)
469 i += tel->length + 2;
470 else
471 i++;
472 }
473 }
474 nexthdr = next;
475 off += optlen;
476 }
477 return 0;
478 }
479 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
480
481 /**
482 * ip6_tnl_err - tunnel error handler
483 *
484 * Description:
485 * ip6_tnl_err() should handle errors in the tunnel according
486 * to the specifications in RFC 2473.
487 **/
488
489 static int
490 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
491 u8 *type, u8 *code, int *msg, __u32 *info, int offset)
492 {
493 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
494 struct net *net = dev_net(skb->dev);
495 u8 rel_type = ICMPV6_DEST_UNREACH;
496 u8 rel_code = ICMPV6_ADDR_UNREACH;
497 __u32 rel_info = 0;
498 struct ip6_tnl *t;
499 int err = -ENOENT;
500 int rel_msg = 0;
501 u8 tproto;
502 __u16 len;
503
504 /* If the packet doesn't contain the original IPv6 header we are
505 in trouble since we might need the source address for further
506 processing of the error. */
507
508 rcu_read_lock();
509 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr);
510 if (!t)
511 goto out;
512
513 tproto = READ_ONCE(t->parms.proto);
514 if (tproto != ipproto && tproto != 0)
515 goto out;
516
517 err = 0;
518
519 switch (*type) {
520 case ICMPV6_DEST_UNREACH:
521 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
522 t->parms.name);
523 rel_msg = 1;
524 break;
525 case ICMPV6_TIME_EXCEED:
526 if ((*code) == ICMPV6_EXC_HOPLIMIT) {
527 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
528 t->parms.name);
529 rel_msg = 1;
530 }
531 break;
532 case ICMPV6_PARAMPROB: {
533 struct ipv6_tlv_tnl_enc_lim *tel;
534 __u32 teli;
535
536 teli = 0;
537 if ((*code) == ICMPV6_HDR_FIELD)
538 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
539
540 if (teli && teli == *info - 2) {
541 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
542 if (tel->encap_limit == 0) {
543 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
544 t->parms.name);
545 rel_msg = 1;
546 }
547 } else {
548 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
549 t->parms.name);
550 }
551 break;
552 }
553 case ICMPV6_PKT_TOOBIG: {
554 __u32 mtu;
555
556 ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
557 sock_net_uid(net, NULL));
558 mtu = *info - offset;
559 if (mtu < IPV6_MIN_MTU)
560 mtu = IPV6_MIN_MTU;
561 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
562 if (len > mtu) {
563 rel_type = ICMPV6_PKT_TOOBIG;
564 rel_code = 0;
565 rel_info = mtu;
566 rel_msg = 1;
567 }
568 break;
569 }
570 case NDISC_REDIRECT:
571 ip6_redirect(skb, net, skb->dev->ifindex, 0,
572 sock_net_uid(net, NULL));
573 break;
574 }
575
576 *type = rel_type;
577 *code = rel_code;
578 *info = rel_info;
579 *msg = rel_msg;
580
581 out:
582 rcu_read_unlock();
583 return err;
584 }
585
586 static int
587 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
588 u8 type, u8 code, int offset, __be32 info)
589 {
590 __u32 rel_info = ntohl(info);
591 const struct iphdr *eiph;
592 struct sk_buff *skb2;
593 int err, rel_msg = 0;
594 u8 rel_type = type;
595 u8 rel_code = code;
596 struct rtable *rt;
597 struct flowi4 fl4;
598
599 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
600 &rel_msg, &rel_info, offset);
601 if (err < 0)
602 return err;
603
604 if (rel_msg == 0)
605 return 0;
606
607 switch (rel_type) {
608 case ICMPV6_DEST_UNREACH:
609 if (rel_code != ICMPV6_ADDR_UNREACH)
610 return 0;
611 rel_type = ICMP_DEST_UNREACH;
612 rel_code = ICMP_HOST_UNREACH;
613 break;
614 case ICMPV6_PKT_TOOBIG:
615 if (rel_code != 0)
616 return 0;
617 rel_type = ICMP_DEST_UNREACH;
618 rel_code = ICMP_FRAG_NEEDED;
619 break;
620 default:
621 return 0;
622 }
623
624 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
625 return 0;
626
627 skb2 = skb_clone(skb, GFP_ATOMIC);
628 if (!skb2)
629 return 0;
630
631 skb_dst_drop(skb2);
632
633 skb_pull(skb2, offset);
634 skb_reset_network_header(skb2);
635 eiph = ip_hdr(skb2);
636
637 /* Try to guess incoming interface */
638 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
639 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
640 if (IS_ERR(rt))
641 goto out;
642
643 skb2->dev = rt->dst.dev;
644 ip_rt_put(rt);
645
646 /* route "incoming" packet */
647 if (rt->rt_flags & RTCF_LOCAL) {
648 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
649 eiph->daddr, eiph->saddr, 0, 0,
650 IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
651 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) {
652 if (!IS_ERR(rt))
653 ip_rt_put(rt);
654 goto out;
655 }
656 skb_dst_set(skb2, &rt->dst);
657 } else {
658 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
659 skb2->dev) ||
660 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6)
661 goto out;
662 }
663
664 /* change mtu on this route */
665 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
666 if (rel_info > dst_mtu(skb_dst(skb2)))
667 goto out;
668
669 skb_dst_update_pmtu_no_confirm(skb2, rel_info);
670 }
671
672 icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
673
674 out:
675 kfree_skb(skb2);
676 return 0;
677 }
678
679 static int
680 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
681 u8 type, u8 code, int offset, __be32 info)
682 {
683 __u32 rel_info = ntohl(info);
684 int err, rel_msg = 0;
685 u8 rel_type = type;
686 u8 rel_code = code;
687
688 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
689 &rel_msg, &rel_info, offset);
690 if (err < 0)
691 return err;
692
693 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
694 struct rt6_info *rt;
695 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
696
697 if (!skb2)
698 return 0;
699
700 skb_dst_drop(skb2);
701 skb_pull(skb2, offset);
702 skb_reset_network_header(skb2);
703
704 /* Try to guess incoming interface */
705 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
706 NULL, 0, skb2, 0);
707
708 if (rt && rt->dst.dev)
709 skb2->dev = rt->dst.dev;
710
711 icmpv6_send(skb2, rel_type, rel_code, rel_info);
712
713 ip6_rt_put(rt);
714
715 kfree_skb(skb2);
716 }
717
718 return 0;
719 }
720
721 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
722 const struct ipv6hdr *ipv6h,
723 struct sk_buff *skb)
724 {
725 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
726
727 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
728 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
729
730 return IP6_ECN_decapsulate(ipv6h, skb);
731 }
732
733 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
734 const struct ipv6hdr *ipv6h,
735 struct sk_buff *skb)
736 {
737 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
738 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
739
740 return IP6_ECN_decapsulate(ipv6h, skb);
741 }
742
743 __u32 ip6_tnl_get_cap(struct ip6_tnl *t,
744 const struct in6_addr *laddr,
745 const struct in6_addr *raddr)
746 {
747 struct __ip6_tnl_parm *p = &t->parms;
748 int ltype = ipv6_addr_type(laddr);
749 int rtype = ipv6_addr_type(raddr);
750 __u32 flags = 0;
751
752 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
753 flags = IP6_TNL_F_CAP_PER_PACKET;
754 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
755 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
756 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
757 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
758 if (ltype&IPV6_ADDR_UNICAST)
759 flags |= IP6_TNL_F_CAP_XMIT;
760 if (rtype&IPV6_ADDR_UNICAST)
761 flags |= IP6_TNL_F_CAP_RCV;
762 }
763 return flags;
764 }
765 EXPORT_SYMBOL(ip6_tnl_get_cap);
766
767 /* called with rcu_read_lock() */
768 int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
769 const struct in6_addr *laddr,
770 const struct in6_addr *raddr)
771 {
772 struct __ip6_tnl_parm *p = &t->parms;
773 int ret = 0;
774 struct net *net = t->net;
775
776 if ((p->flags & IP6_TNL_F_CAP_RCV) ||
777 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
778 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
779 struct net_device *ldev = NULL;
780
781 if (p->link)
782 ldev = dev_get_by_index_rcu(net, p->link);
783
784 if ((ipv6_addr_is_multicast(laddr) ||
785 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
786 0, IFA_F_TENTATIVE))) &&
787 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
788 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
789 0, IFA_F_TENTATIVE))))
790 ret = 1;
791 }
792 return ret;
793 }
794 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
795
796 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
797 const struct tnl_ptk_info *tpi,
798 struct metadata_dst *tun_dst,
799 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
800 const struct ipv6hdr *ipv6h,
801 struct sk_buff *skb),
802 bool log_ecn_err)
803 {
804 struct pcpu_sw_netstats *tstats;
805 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
806 int err;
807
808 if ((!(tpi->flags & TUNNEL_CSUM) &&
809 (tunnel->parms.i_flags & TUNNEL_CSUM)) ||
810 ((tpi->flags & TUNNEL_CSUM) &&
811 !(tunnel->parms.i_flags & TUNNEL_CSUM))) {
812 tunnel->dev->stats.rx_crc_errors++;
813 tunnel->dev->stats.rx_errors++;
814 goto drop;
815 }
816
817 if (tunnel->parms.i_flags & TUNNEL_SEQ) {
818 if (!(tpi->flags & TUNNEL_SEQ) ||
819 (tunnel->i_seqno &&
820 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
821 tunnel->dev->stats.rx_fifo_errors++;
822 tunnel->dev->stats.rx_errors++;
823 goto drop;
824 }
825 tunnel->i_seqno = ntohl(tpi->seq) + 1;
826 }
827
828 skb->protocol = tpi->proto;
829
830 /* Warning: All skb pointers will be invalidated! */
831 if (tunnel->dev->type == ARPHRD_ETHER) {
832 if (!pskb_may_pull(skb, ETH_HLEN)) {
833 tunnel->dev->stats.rx_length_errors++;
834 tunnel->dev->stats.rx_errors++;
835 goto drop;
836 }
837
838 ipv6h = ipv6_hdr(skb);
839 skb->protocol = eth_type_trans(skb, tunnel->dev);
840 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
841 } else {
842 skb->dev = tunnel->dev;
843 }
844
845 skb_reset_network_header(skb);
846 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
847
848 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
849
850 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
851 if (unlikely(err)) {
852 if (log_ecn_err)
853 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n",
854 &ipv6h->saddr,
855 ipv6_get_dsfield(ipv6h));
856 if (err > 1) {
857 ++tunnel->dev->stats.rx_frame_errors;
858 ++tunnel->dev->stats.rx_errors;
859 goto drop;
860 }
861 }
862
863 tstats = this_cpu_ptr(tunnel->dev->tstats);
864 u64_stats_update_begin(&tstats->syncp);
865 tstats->rx_packets++;
866 tstats->rx_bytes += skb->len;
867 u64_stats_update_end(&tstats->syncp);
868
869 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
870
871 if (tun_dst)
872 skb_dst_set(skb, (struct dst_entry *)tun_dst);
873
874 gro_cells_receive(&tunnel->gro_cells, skb);
875 return 0;
876
877 drop:
878 if (tun_dst)
879 dst_release((struct dst_entry *)tun_dst);
880 kfree_skb(skb);
881 return 0;
882 }
883
884 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
885 const struct tnl_ptk_info *tpi,
886 struct metadata_dst *tun_dst,
887 bool log_ecn_err)
888 {
889 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
890 log_ecn_err);
891 }
892 EXPORT_SYMBOL(ip6_tnl_rcv);
893
894 static const struct tnl_ptk_info tpi_v6 = {
895 /* no tunnel info required for ipxip6. */
896 .proto = htons(ETH_P_IPV6),
897 };
898
899 static const struct tnl_ptk_info tpi_v4 = {
900 /* no tunnel info required for ipxip6. */
901 .proto = htons(ETH_P_IP),
902 };
903
904 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
905 const struct tnl_ptk_info *tpi,
906 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
907 const struct ipv6hdr *ipv6h,
908 struct sk_buff *skb))
909 {
910 struct ip6_tnl *t;
911 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
912 struct metadata_dst *tun_dst = NULL;
913 int ret = -1;
914
915 rcu_read_lock();
916 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr);
917
918 if (t) {
919 u8 tproto = READ_ONCE(t->parms.proto);
920
921 if (tproto != ipproto && tproto != 0)
922 goto drop;
923 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
924 goto drop;
925 ipv6h = ipv6_hdr(skb);
926 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
927 goto drop;
928 if (iptunnel_pull_header(skb, 0, tpi->proto, false))
929 goto drop;
930 if (t->parms.collect_md) {
931 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
932 if (!tun_dst)
933 goto drop;
934 }
935 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
936 log_ecn_error);
937 }
938
939 rcu_read_unlock();
940
941 return ret;
942
943 drop:
944 rcu_read_unlock();
945 kfree_skb(skb);
946 return 0;
947 }
948
949 static int ip4ip6_rcv(struct sk_buff *skb)
950 {
951 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
952 ip4ip6_dscp_ecn_decapsulate);
953 }
954
955 static int ip6ip6_rcv(struct sk_buff *skb)
956 {
957 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
958 ip6ip6_dscp_ecn_decapsulate);
959 }
960
961 struct ipv6_tel_txoption {
962 struct ipv6_txoptions ops;
963 __u8 dst_opt[8];
964 };
965
966 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
967 {
968 memset(opt, 0, sizeof(struct ipv6_tel_txoption));
969
970 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
971 opt->dst_opt[3] = 1;
972 opt->dst_opt[4] = encap_limit;
973 opt->dst_opt[5] = IPV6_TLV_PADN;
974 opt->dst_opt[6] = 1;
975
976 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
977 opt->ops.opt_nflen = 8;
978 }
979
980 /**
981 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
982 * @t: the outgoing tunnel device
983 * @hdr: IPv6 header from the incoming packet
984 *
985 * Description:
986 * Avoid trivial tunneling loop by checking that tunnel exit-point
987 * doesn't match source of incoming packet.
988 *
989 * Return:
990 * 1 if conflict,
991 * 0 else
992 **/
993
994 static inline bool
995 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
996 {
997 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
998 }
999
1000 int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
1001 const struct in6_addr *laddr,
1002 const struct in6_addr *raddr)
1003 {
1004 struct __ip6_tnl_parm *p = &t->parms;
1005 int ret = 0;
1006 struct net *net = t->net;
1007
1008 if (t->parms.collect_md)
1009 return 1;
1010
1011 if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
1012 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
1013 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
1014 struct net_device *ldev = NULL;
1015
1016 rcu_read_lock();
1017 if (p->link)
1018 ldev = dev_get_by_index_rcu(net, p->link);
1019
1020 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
1021 0, IFA_F_TENTATIVE)))
1022 pr_warn("%s xmit: Local address not yet configured!\n",
1023 p->name);
1024 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
1025 !ipv6_addr_is_multicast(raddr) &&
1026 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
1027 true, 0, IFA_F_TENTATIVE)))
1028 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
1029 p->name);
1030 else
1031 ret = 1;
1032 rcu_read_unlock();
1033 }
1034 return ret;
1035 }
1036 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
1037
1038 /**
1039 * ip6_tnl_xmit - encapsulate packet and send
1040 * @skb: the outgoing socket buffer
1041 * @dev: the outgoing tunnel device
1042 * @dsfield: dscp code for outer header
1043 * @fl6: flow of tunneled packet
1044 * @encap_limit: encapsulation limit
1045 * @pmtu: Path MTU is stored if packet is too big
1046 * @proto: next header value
1047 *
1048 * Description:
1049 * Build new header and do some sanity checks on the packet before sending
1050 * it.
1051 *
1052 * Return:
1053 * 0 on success
1054 * -1 fail
1055 * %-EMSGSIZE message too big. return mtu in this case.
1056 **/
1057
1058 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
1059 struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
1060 __u8 proto)
1061 {
1062 struct ip6_tnl *t = netdev_priv(dev);
1063 struct net *net = t->net;
1064 struct net_device_stats *stats = &t->dev->stats;
1065 struct ipv6hdr *ipv6h;
1066 struct ipv6_tel_txoption opt;
1067 struct dst_entry *dst = NULL, *ndst = NULL;
1068 struct net_device *tdev;
1069 int mtu;
1070 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
1071 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
1072 unsigned int max_headroom = psh_hlen;
1073 bool use_cache = false;
1074 u8 hop_limit;
1075 int err = -1;
1076
1077 if (t->parms.collect_md) {
1078 hop_limit = skb_tunnel_info(skb)->key.ttl;
1079 goto route_lookup;
1080 } else {
1081 hop_limit = t->parms.hop_limit;
1082 }
1083
1084 /* NBMA tunnel */
1085 if (ipv6_addr_any(&t->parms.raddr)) {
1086 if (skb->protocol == htons(ETH_P_IPV6)) {
1087 struct in6_addr *addr6;
1088 struct neighbour *neigh;
1089 int addr_type;
1090
1091 if (!skb_dst(skb))
1092 goto tx_err_link_failure;
1093
1094 neigh = dst_neigh_lookup(skb_dst(skb),
1095 &ipv6_hdr(skb)->daddr);
1096 if (!neigh)
1097 goto tx_err_link_failure;
1098
1099 addr6 = (struct in6_addr *)&neigh->primary_key;
1100 addr_type = ipv6_addr_type(addr6);
1101
1102 if (addr_type == IPV6_ADDR_ANY)
1103 addr6 = &ipv6_hdr(skb)->daddr;
1104
1105 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
1106 neigh_release(neigh);
1107 }
1108 } else if (t->parms.proto != 0 && !(t->parms.flags &
1109 (IP6_TNL_F_USE_ORIG_TCLASS |
1110 IP6_TNL_F_USE_ORIG_FWMARK))) {
1111 /* enable the cache only if neither the outer protocol nor the
1112 * routing decision depends on the current inner header value
1113 */
1114 use_cache = true;
1115 }
1116
1117 if (use_cache)
1118 dst = dst_cache_get(&t->dst_cache);
1119
1120 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
1121 goto tx_err_link_failure;
1122
1123 if (!dst) {
1124 route_lookup:
1125 /* add dsfield to flowlabel for route lookup */
1126 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
1127
1128 dst = ip6_route_output(net, NULL, fl6);
1129
1130 if (dst->error)
1131 goto tx_err_link_failure;
1132 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
1133 if (IS_ERR(dst)) {
1134 err = PTR_ERR(dst);
1135 dst = NULL;
1136 goto tx_err_link_failure;
1137 }
1138 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
1139 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
1140 &fl6->daddr, 0, &fl6->saddr))
1141 goto tx_err_link_failure;
1142 ndst = dst;
1143 }
1144
1145 tdev = dst->dev;
1146
1147 if (tdev == dev) {
1148 stats->collisions++;
1149 net_warn_ratelimited("%s: Local routing loop detected!\n",
1150 t->parms.name);
1151 goto tx_err_dst_release;
1152 }
1153 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
1154 if (encap_limit >= 0) {
1155 max_headroom += 8;
1156 mtu -= 8;
1157 }
1158 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
1159 IPV6_MIN_MTU : IPV4_MIN_MTU);
1160
1161 skb_dst_update_pmtu_no_confirm(skb, mtu);
1162 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
1163 *pmtu = mtu;
1164 err = -EMSGSIZE;
1165 goto tx_err_dst_release;
1166 }
1167
1168 if (t->err_count > 0) {
1169 if (time_before(jiffies,
1170 t->err_time + IP6TUNNEL_ERR_TIMEO)) {
1171 t->err_count--;
1172
1173 dst_link_failure(skb);
1174 } else {
1175 t->err_count = 0;
1176 }
1177 }
1178
1179 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
1180
1181 /*
1182 * Okay, now see if we can stuff it in the buffer as-is.
1183 */
1184 max_headroom += LL_RESERVED_SPACE(tdev);
1185
1186 if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
1187 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
1188 struct sk_buff *new_skb;
1189
1190 new_skb = skb_realloc_headroom(skb, max_headroom);
1191 if (!new_skb)
1192 goto tx_err_dst_release;
1193
1194 if (skb->sk)
1195 skb_set_owner_w(new_skb, skb->sk);
1196 consume_skb(skb);
1197 skb = new_skb;
1198 }
1199
1200 if (t->parms.collect_md) {
1201 if (t->encap.type != TUNNEL_ENCAP_NONE)
1202 goto tx_err_dst_release;
1203 } else {
1204 if (use_cache && ndst)
1205 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
1206 }
1207 skb_dst_set(skb, dst);
1208
1209 if (hop_limit == 0) {
1210 if (skb->protocol == htons(ETH_P_IP))
1211 hop_limit = ip_hdr(skb)->ttl;
1212 else if (skb->protocol == htons(ETH_P_IPV6))
1213 hop_limit = ipv6_hdr(skb)->hop_limit;
1214 else
1215 hop_limit = ip6_dst_hoplimit(dst);
1216 }
1217
1218 /* Calculate max headroom for all the headers and adjust
1219 * needed_headroom if necessary.
1220 */
1221 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
1222 + dst->header_len + t->hlen;
1223 if (max_headroom > dev->needed_headroom)
1224 dev->needed_headroom = max_headroom;
1225
1226 err = ip6_tnl_encap(skb, t, &proto, fl6);
1227 if (err)
1228 return err;
1229
1230 if (encap_limit >= 0) {
1231 init_tel_txopt(&opt, encap_limit);
1232 ipv6_push_frag_opts(skb, &opt.ops, &proto);
1233 }
1234
1235 skb_push(skb, sizeof(struct ipv6hdr));
1236 skb_reset_network_header(skb);
1237 ipv6h = ipv6_hdr(skb);
1238 ip6_flow_hdr(ipv6h, dsfield,
1239 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
1240 ipv6h->hop_limit = hop_limit;
1241 ipv6h->nexthdr = proto;
1242 ipv6h->saddr = fl6->saddr;
1243 ipv6h->daddr = fl6->daddr;
1244 ip6tunnel_xmit(NULL, skb, dev);
1245 return 0;
1246 tx_err_link_failure:
1247 stats->tx_carrier_errors++;
1248 dst_link_failure(skb);
1249 tx_err_dst_release:
1250 dst_release(dst);
1251 return err;
1252 }
1253 EXPORT_SYMBOL(ip6_tnl_xmit);
1254
1255 static inline int
1256 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1257 {
1258 struct ip6_tnl *t = netdev_priv(dev);
1259 const struct iphdr *iph;
1260 int encap_limit = -1;
1261 struct flowi6 fl6;
1262 __u8 dsfield;
1263 __u32 mtu;
1264 u8 tproto;
1265 int err;
1266
1267 iph = ip_hdr(skb);
1268 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1269
1270 tproto = READ_ONCE(t->parms.proto);
1271 if (tproto != IPPROTO_IPIP && tproto != 0)
1272 return -1;
1273
1274 if (t->parms.collect_md) {
1275 struct ip_tunnel_info *tun_info;
1276 const struct ip_tunnel_key *key;
1277
1278 tun_info = skb_tunnel_info(skb);
1279 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1280 ip_tunnel_info_af(tun_info) != AF_INET6))
1281 return -1;
1282 key = &tun_info->key;
1283 memset(&fl6, 0, sizeof(fl6));
1284 fl6.flowi6_proto = IPPROTO_IPIP;
1285 fl6.saddr = key->u.ipv6.src;
1286 fl6.daddr = key->u.ipv6.dst;
1287 fl6.flowlabel = key->label;
1288 dsfield = key->tos;
1289 } else {
1290 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1291 encap_limit = t->parms.encap_limit;
1292
1293 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1294 fl6.flowi6_proto = IPPROTO_IPIP;
1295
1296 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1297 dsfield = ipv4_get_dsfield(iph);
1298 else
1299 dsfield = ip6_tclass(t->parms.flowinfo);
1300 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1301 fl6.flowi6_mark = skb->mark;
1302 else
1303 fl6.flowi6_mark = t->parms.fwmark;
1304 }
1305
1306 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1307 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
1308
1309 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1310 return -1;
1311
1312 skb_set_inner_ipproto(skb, IPPROTO_IPIP);
1313
1314 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1315 IPPROTO_IPIP);
1316 if (err != 0) {
1317 /* XXX: send ICMP error even if DF is not set. */
1318 if (err == -EMSGSIZE)
1319 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
1320 htonl(mtu));
1321 return -1;
1322 }
1323
1324 return 0;
1325 }
1326
1327 static inline int
1328 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
1329 {
1330 struct ip6_tnl *t = netdev_priv(dev);
1331 struct ipv6hdr *ipv6h;
1332 int encap_limit = -1;
1333 __u16 offset;
1334 struct flowi6 fl6;
1335 __u8 dsfield;
1336 __u32 mtu;
1337 u8 tproto;
1338 int err;
1339
1340 ipv6h = ipv6_hdr(skb);
1341 tproto = READ_ONCE(t->parms.proto);
1342 if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
1343 ip6_tnl_addr_conflict(t, ipv6h))
1344 return -1;
1345
1346 if (t->parms.collect_md) {
1347 struct ip_tunnel_info *tun_info;
1348 const struct ip_tunnel_key *key;
1349
1350 tun_info = skb_tunnel_info(skb);
1351 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1352 ip_tunnel_info_af(tun_info) != AF_INET6))
1353 return -1;
1354 key = &tun_info->key;
1355 memset(&fl6, 0, sizeof(fl6));
1356 fl6.flowi6_proto = IPPROTO_IPV6;
1357 fl6.saddr = key->u.ipv6.src;
1358 fl6.daddr = key->u.ipv6.dst;
1359 fl6.flowlabel = key->label;
1360 dsfield = key->tos;
1361 } else {
1362 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
1363 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
1364 ipv6h = ipv6_hdr(skb);
1365 if (offset > 0) {
1366 struct ipv6_tlv_tnl_enc_lim *tel;
1367
1368 tel = (void *)&skb_network_header(skb)[offset];
1369 if (tel->encap_limit == 0) {
1370 icmpv6_send(skb, ICMPV6_PARAMPROB,
1371 ICMPV6_HDR_FIELD, offset + 2);
1372 return -1;
1373 }
1374 encap_limit = tel->encap_limit - 1;
1375 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
1376 encap_limit = t->parms.encap_limit;
1377 }
1378
1379 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1380 fl6.flowi6_proto = IPPROTO_IPV6;
1381
1382 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
1383 dsfield = ipv6_get_dsfield(ipv6h);
1384 else
1385 dsfield = ip6_tclass(t->parms.flowinfo);
1386 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
1387 fl6.flowlabel |= ip6_flowlabel(ipv6h);
1388 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
1389 fl6.flowi6_mark = skb->mark;
1390 else
1391 fl6.flowi6_mark = t->parms.fwmark;
1392 }
1393
1394 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1395 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
1396
1397 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
1398 return -1;
1399
1400 skb_set_inner_ipproto(skb, IPPROTO_IPV6);
1401
1402 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1403 IPPROTO_IPV6);
1404 if (err != 0) {
1405 if (err == -EMSGSIZE)
1406 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1407 return -1;
1408 }
1409
1410 return 0;
1411 }
1412
1413 static netdev_tx_t
1414 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev)
1415 {
1416 struct ip6_tnl *t = netdev_priv(dev);
1417 struct net_device_stats *stats = &t->dev->stats;
1418 int ret;
1419
1420 if (!pskb_inet_may_pull(skb))
1421 goto tx_err;
1422
1423 switch (skb->protocol) {
1424 case htons(ETH_P_IP):
1425 ret = ip4ip6_tnl_xmit(skb, dev);
1426 break;
1427 case htons(ETH_P_IPV6):
1428 ret = ip6ip6_tnl_xmit(skb, dev);
1429 break;
1430 default:
1431 goto tx_err;
1432 }
1433
1434 if (ret < 0)
1435 goto tx_err;
1436
1437 return NETDEV_TX_OK;
1438
1439 tx_err:
1440 stats->tx_errors++;
1441 stats->tx_dropped++;
1442 kfree_skb(skb);
1443 return NETDEV_TX_OK;
1444 }
1445
1446 static void ip6_tnl_link_config(struct ip6_tnl *t)
1447 {
1448 struct net_device *dev = t->dev;
1449 struct net_device *tdev = NULL;
1450 struct __ip6_tnl_parm *p = &t->parms;
1451 struct flowi6 *fl6 = &t->fl.u.ip6;
1452 unsigned int mtu;
1453 int t_hlen;
1454
1455 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1456 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1457
1458 /* Set up flowi template */
1459 fl6->saddr = p->laddr;
1460 fl6->daddr = p->raddr;
1461 fl6->flowi6_oif = p->link;
1462 fl6->flowlabel = 0;
1463
1464 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1465 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1466 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1467 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1468
1469 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1470 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1471
1472 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV)
1473 dev->flags |= IFF_POINTOPOINT;
1474 else
1475 dev->flags &= ~IFF_POINTOPOINT;
1476
1477 t->tun_hlen = 0;
1478 t->hlen = t->encap_hlen + t->tun_hlen;
1479 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1480
1481 if (p->flags & IP6_TNL_F_CAP_XMIT) {
1482 int strict = (ipv6_addr_type(&p->raddr) &
1483 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1484
1485 struct rt6_info *rt = rt6_lookup(t->net,
1486 &p->raddr, &p->laddr,
1487 p->link, NULL, strict);
1488 if (rt) {
1489 tdev = rt->dst.dev;
1490 ip6_rt_put(rt);
1491 }
1492
1493 if (!tdev && p->link)
1494 tdev = __dev_get_by_index(t->net, p->link);
1495
1496 if (tdev) {
1497 dev->hard_header_len = tdev->hard_header_len + t_hlen;
1498 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU);
1499
1500 dev->mtu = mtu - t_hlen;
1501 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1502 dev->mtu -= 8;
1503
1504 if (dev->mtu < IPV6_MIN_MTU)
1505 dev->mtu = IPV6_MIN_MTU;
1506 }
1507 }
1508 }
1509
1510 /**
1511 * ip6_tnl_change - update the tunnel parameters
1512 * @t: tunnel to be changed
1513 * @p: tunnel configuration parameters
1514 *
1515 * Description:
1516 * ip6_tnl_change() updates the tunnel parameters
1517 **/
1518
1519 static int
1520 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
1521 {
1522 t->parms.laddr = p->laddr;
1523 t->parms.raddr = p->raddr;
1524 t->parms.flags = p->flags;
1525 t->parms.hop_limit = p->hop_limit;
1526 t->parms.encap_limit = p->encap_limit;
1527 t->parms.flowinfo = p->flowinfo;
1528 t->parms.link = p->link;
1529 t->parms.proto = p->proto;
1530 t->parms.fwmark = p->fwmark;
1531 dst_cache_reset(&t->dst_cache);
1532 ip6_tnl_link_config(t);
1533 return 0;
1534 }
1535
1536 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1537 {
1538 struct net *net = t->net;
1539 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1540 int err;
1541
1542 ip6_tnl_unlink(ip6n, t);
1543 synchronize_net();
1544 err = ip6_tnl_change(t, p);
1545 ip6_tnl_link(ip6n, t);
1546 netdev_state_change(t->dev);
1547 return err;
1548 }
1549
1550 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
1551 {
1552 /* for default tnl0 device allow to change only the proto */
1553 t->parms.proto = p->proto;
1554 netdev_state_change(t->dev);
1555 return 0;
1556 }
1557
1558 static void
1559 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)
1560 {
1561 p->laddr = u->laddr;
1562 p->raddr = u->raddr;
1563 p->flags = u->flags;
1564 p->hop_limit = u->hop_limit;
1565 p->encap_limit = u->encap_limit;
1566 p->flowinfo = u->flowinfo;
1567 p->link = u->link;
1568 p->proto = u->proto;
1569 memcpy(p->name, u->name, sizeof(u->name));
1570 }
1571
1572 static void
1573 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
1574 {
1575 u->laddr = p->laddr;
1576 u->raddr = p->raddr;
1577 u->flags = p->flags;
1578 u->hop_limit = p->hop_limit;
1579 u->encap_limit = p->encap_limit;
1580 u->flowinfo = p->flowinfo;
1581 u->link = p->link;
1582 u->proto = p->proto;
1583 memcpy(u->name, p->name, sizeof(u->name));
1584 }
1585
1586 /**
1587 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace
1588 * @dev: virtual device associated with tunnel
1589 * @ifr: parameters passed from userspace
1590 * @cmd: command to be performed
1591 *
1592 * Description:
1593 * ip6_tnl_ioctl() is used for managing IPv6 tunnels
1594 * from userspace.
1595 *
1596 * The possible commands are the following:
1597 * %SIOCGETTUNNEL: get tunnel parameters for device
1598 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
1599 * %SIOCCHGTUNNEL: change tunnel parameters to those given
1600 * %SIOCDELTUNNEL: delete tunnel
1601 *
1602 * The fallback device "ip6tnl0", created during module
1603 * initialization, can be used for creating other tunnel devices.
1604 *
1605 * Return:
1606 * 0 on success,
1607 * %-EFAULT if unable to copy data to or from userspace,
1608 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
1609 * %-EINVAL if passed tunnel parameters are invalid,
1610 * %-EEXIST if changing a tunnel's parameters would cause a conflict
1611 * %-ENODEV if attempting to change or delete a nonexisting device
1612 **/
1613
1614 static int
1615 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1616 {
1617 int err = 0;
1618 struct ip6_tnl_parm p;
1619 struct __ip6_tnl_parm p1;
1620 struct ip6_tnl *t = netdev_priv(dev);
1621 struct net *net = t->net;
1622 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1623
1624 memset(&p1, 0, sizeof(p1));
1625
1626 switch (cmd) {
1627 case SIOCGETTUNNEL:
1628 if (dev == ip6n->fb_tnl_dev) {
1629 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1630 err = -EFAULT;
1631 break;
1632 }
1633 ip6_tnl_parm_from_user(&p1, &p);
1634 t = ip6_tnl_locate(net, &p1, 0);
1635 if (IS_ERR(t))
1636 t = netdev_priv(dev);
1637 } else {
1638 memset(&p, 0, sizeof(p));
1639 }
1640 ip6_tnl_parm_to_user(&p, &t->parms);
1641 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) {
1642 err = -EFAULT;
1643 }
1644 break;
1645 case SIOCADDTUNNEL:
1646 case SIOCCHGTUNNEL:
1647 err = -EPERM;
1648 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1649 break;
1650 err = -EFAULT;
1651 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1652 break;
1653 err = -EINVAL;
1654 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
1655 p.proto != 0)
1656 break;
1657 ip6_tnl_parm_from_user(&p1, &p);
1658 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
1659 if (cmd == SIOCCHGTUNNEL) {
1660 if (!IS_ERR(t)) {
1661 if (t->dev != dev) {
1662 err = -EEXIST;
1663 break;
1664 }
1665 } else
1666 t = netdev_priv(dev);
1667 if (dev == ip6n->fb_tnl_dev)
1668 err = ip6_tnl0_update(t, &p1);
1669 else
1670 err = ip6_tnl_update(t, &p1);
1671 }
1672 if (!IS_ERR(t)) {
1673 err = 0;
1674 ip6_tnl_parm_to_user(&p, &t->parms);
1675 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1676 err = -EFAULT;
1677
1678 } else {
1679 err = PTR_ERR(t);
1680 }
1681 break;
1682 case SIOCDELTUNNEL:
1683 err = -EPERM;
1684 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1685 break;
1686
1687 if (dev == ip6n->fb_tnl_dev) {
1688 err = -EFAULT;
1689 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1690 break;
1691 err = -ENOENT;
1692 ip6_tnl_parm_from_user(&p1, &p);
1693 t = ip6_tnl_locate(net, &p1, 0);
1694 if (IS_ERR(t))
1695 break;
1696 err = -EPERM;
1697 if (t->dev == ip6n->fb_tnl_dev)
1698 break;
1699 dev = t->dev;
1700 }
1701 err = 0;
1702 unregister_netdevice(dev);
1703 break;
1704 default:
1705 err = -EINVAL;
1706 }
1707 return err;
1708 }
1709
1710 /**
1711 * ip6_tnl_change_mtu - change mtu manually for tunnel device
1712 * @dev: virtual device associated with tunnel
1713 * @new_mtu: the new mtu
1714 *
1715 * Return:
1716 * 0 on success,
1717 * %-EINVAL if mtu too small
1718 **/
1719
1720 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
1721 {
1722 struct ip6_tnl *tnl = netdev_priv(dev);
1723
1724 if (tnl->parms.proto == IPPROTO_IPV6) {
1725 if (new_mtu < IPV6_MIN_MTU)
1726 return -EINVAL;
1727 } else {
1728 if (new_mtu < ETH_MIN_MTU)
1729 return -EINVAL;
1730 }
1731 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
1732 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
1733 return -EINVAL;
1734 } else {
1735 if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
1736 return -EINVAL;
1737 }
1738 dev->mtu = new_mtu;
1739 return 0;
1740 }
1741 EXPORT_SYMBOL(ip6_tnl_change_mtu);
1742
1743 int ip6_tnl_get_iflink(const struct net_device *dev)
1744 {
1745 struct ip6_tnl *t = netdev_priv(dev);
1746
1747 return t->parms.link;
1748 }
1749 EXPORT_SYMBOL(ip6_tnl_get_iflink);
1750
1751 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
1752 unsigned int num)
1753 {
1754 if (num >= MAX_IPTUN_ENCAP_OPS)
1755 return -ERANGE;
1756
1757 return !cmpxchg((const struct ip6_tnl_encap_ops **)
1758 &ip6tun_encaps[num],
1759 NULL, ops) ? 0 : -1;
1760 }
1761 EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
1762
1763 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
1764 unsigned int num)
1765 {
1766 int ret;
1767
1768 if (num >= MAX_IPTUN_ENCAP_OPS)
1769 return -ERANGE;
1770
1771 ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
1772 &ip6tun_encaps[num],
1773 ops, NULL) == ops) ? 0 : -1;
1774
1775 synchronize_net();
1776
1777 return ret;
1778 }
1779 EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
1780
1781 int ip6_tnl_encap_setup(struct ip6_tnl *t,
1782 struct ip_tunnel_encap *ipencap)
1783 {
1784 int hlen;
1785
1786 memset(&t->encap, 0, sizeof(t->encap));
1787
1788 hlen = ip6_encap_hlen(ipencap);
1789 if (hlen < 0)
1790 return hlen;
1791
1792 t->encap.type = ipencap->type;
1793 t->encap.sport = ipencap->sport;
1794 t->encap.dport = ipencap->dport;
1795 t->encap.flags = ipencap->flags;
1796
1797 t->encap_hlen = hlen;
1798 t->hlen = t->encap_hlen + t->tun_hlen;
1799
1800 return 0;
1801 }
1802 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
1803
1804 static const struct net_device_ops ip6_tnl_netdev_ops = {
1805 .ndo_init = ip6_tnl_dev_init,
1806 .ndo_uninit = ip6_tnl_dev_uninit,
1807 .ndo_start_xmit = ip6_tnl_start_xmit,
1808 .ndo_do_ioctl = ip6_tnl_ioctl,
1809 .ndo_change_mtu = ip6_tnl_change_mtu,
1810 .ndo_get_stats = ip6_get_stats,
1811 .ndo_get_iflink = ip6_tnl_get_iflink,
1812 };
1813
1814 #define IPXIPX_FEATURES (NETIF_F_SG | \
1815 NETIF_F_FRAGLIST | \
1816 NETIF_F_HIGHDMA | \
1817 NETIF_F_GSO_SOFTWARE | \
1818 NETIF_F_HW_CSUM)
1819
1820 /**
1821 * ip6_tnl_dev_setup - setup virtual tunnel device
1822 * @dev: virtual device associated with tunnel
1823 *
1824 * Description:
1825 * Initialize function pointers and device parameters
1826 **/
1827
1828 static void ip6_tnl_dev_setup(struct net_device *dev)
1829 {
1830 dev->netdev_ops = &ip6_tnl_netdev_ops;
1831 dev->needs_free_netdev = true;
1832 dev->priv_destructor = ip6_dev_free;
1833
1834 dev->type = ARPHRD_TUNNEL6;
1835 dev->flags |= IFF_NOARP;
1836 dev->addr_len = sizeof(struct in6_addr);
1837 dev->features |= NETIF_F_LLTX;
1838 netif_keep_dst(dev);
1839
1840 dev->features |= IPXIPX_FEATURES;
1841 dev->hw_features |= IPXIPX_FEATURES;
1842
1843 /* This perm addr will be used as interface identifier by IPv6 */
1844 dev->addr_assign_type = NET_ADDR_RANDOM;
1845 eth_random_addr(dev->perm_addr);
1846 }
1847
1848
1849 /**
1850 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices
1851 * @dev: virtual device associated with tunnel
1852 **/
1853
1854 static inline int
1855 ip6_tnl_dev_init_gen(struct net_device *dev)
1856 {
1857 struct ip6_tnl *t = netdev_priv(dev);
1858 int ret;
1859 int t_hlen;
1860
1861 t->dev = dev;
1862 t->net = dev_net(dev);
1863 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1864 if (!dev->tstats)
1865 return -ENOMEM;
1866
1867 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
1868 if (ret)
1869 goto free_stats;
1870
1871 ret = gro_cells_init(&t->gro_cells, dev);
1872 if (ret)
1873 goto destroy_dst;
1874
1875 t->tun_hlen = 0;
1876 t->hlen = t->encap_hlen + t->tun_hlen;
1877 t_hlen = t->hlen + sizeof(struct ipv6hdr);
1878
1879 dev->type = ARPHRD_TUNNEL6;
1880 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1881 dev->mtu = ETH_DATA_LEN - t_hlen;
1882 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1883 dev->mtu -= 8;
1884 dev->min_mtu = ETH_MIN_MTU;
1885 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
1886
1887 return 0;
1888
1889 destroy_dst:
1890 dst_cache_destroy(&t->dst_cache);
1891 free_stats:
1892 free_percpu(dev->tstats);
1893 dev->tstats = NULL;
1894
1895 return ret;
1896 }
1897
1898 /**
1899 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices
1900 * @dev: virtual device associated with tunnel
1901 **/
1902
1903 static int ip6_tnl_dev_init(struct net_device *dev)
1904 {
1905 struct ip6_tnl *t = netdev_priv(dev);
1906 int err = ip6_tnl_dev_init_gen(dev);
1907
1908 if (err)
1909 return err;
1910 ip6_tnl_link_config(t);
1911 if (t->parms.collect_md)
1912 netif_keep_dst(dev);
1913 return 0;
1914 }
1915
1916 /**
1917 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device
1918 * @dev: fallback device
1919 *
1920 * Return: 0
1921 **/
1922
1923 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
1924 {
1925 struct ip6_tnl *t = netdev_priv(dev);
1926 struct net *net = dev_net(dev);
1927 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
1928
1929 t->parms.proto = IPPROTO_IPV6;
1930 dev_hold(dev);
1931
1932 rcu_assign_pointer(ip6n->tnls_wc[0], t);
1933 return 0;
1934 }
1935
1936 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
1937 struct netlink_ext_ack *extack)
1938 {
1939 u8 proto;
1940
1941 if (!data || !data[IFLA_IPTUN_PROTO])
1942 return 0;
1943
1944 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1945 if (proto != IPPROTO_IPV6 &&
1946 proto != IPPROTO_IPIP &&
1947 proto != 0)
1948 return -EINVAL;
1949
1950 return 0;
1951 }
1952
1953 static void ip6_tnl_netlink_parms(struct nlattr *data[],
1954 struct __ip6_tnl_parm *parms)
1955 {
1956 memset(parms, 0, sizeof(*parms));
1957
1958 if (!data)
1959 return;
1960
1961 if (data[IFLA_IPTUN_LINK])
1962 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
1963
1964 if (data[IFLA_IPTUN_LOCAL])
1965 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
1966
1967 if (data[IFLA_IPTUN_REMOTE])
1968 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
1969
1970 if (data[IFLA_IPTUN_TTL])
1971 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
1972
1973 if (data[IFLA_IPTUN_ENCAP_LIMIT])
1974 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
1975
1976 if (data[IFLA_IPTUN_FLOWINFO])
1977 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
1978
1979 if (data[IFLA_IPTUN_FLAGS])
1980 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
1981
1982 if (data[IFLA_IPTUN_PROTO])
1983 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
1984
1985 if (data[IFLA_IPTUN_COLLECT_METADATA])
1986 parms->collect_md = true;
1987
1988 if (data[IFLA_IPTUN_FWMARK])
1989 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
1990 }
1991
1992 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
1993 struct ip_tunnel_encap *ipencap)
1994 {
1995 bool ret = false;
1996
1997 memset(ipencap, 0, sizeof(*ipencap));
1998
1999 if (!data)
2000 return ret;
2001
2002 if (data[IFLA_IPTUN_ENCAP_TYPE]) {
2003 ret = true;
2004 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
2005 }
2006
2007 if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
2008 ret = true;
2009 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
2010 }
2011
2012 if (data[IFLA_IPTUN_ENCAP_SPORT]) {
2013 ret = true;
2014 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
2015 }
2016
2017 if (data[IFLA_IPTUN_ENCAP_DPORT]) {
2018 ret = true;
2019 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
2020 }
2021
2022 return ret;
2023 }
2024
2025 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
2026 struct nlattr *tb[], struct nlattr *data[],
2027 struct netlink_ext_ack *extack)
2028 {
2029 struct net *net = dev_net(dev);
2030 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2031 struct ip_tunnel_encap ipencap;
2032 struct ip6_tnl *nt, *t;
2033 int err;
2034
2035 nt = netdev_priv(dev);
2036
2037 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2038 err = ip6_tnl_encap_setup(nt, &ipencap);
2039 if (err < 0)
2040 return err;
2041 }
2042
2043 ip6_tnl_netlink_parms(data, &nt->parms);
2044
2045 if (nt->parms.collect_md) {
2046 if (rtnl_dereference(ip6n->collect_md_tun))
2047 return -EEXIST;
2048 } else {
2049 t = ip6_tnl_locate(net, &nt->parms, 0);
2050 if (!IS_ERR(t))
2051 return -EEXIST;
2052 }
2053
2054 err = ip6_tnl_create2(dev);
2055 if (!err && tb[IFLA_MTU])
2056 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2057
2058 return err;
2059 }
2060
2061 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
2062 struct nlattr *data[],
2063 struct netlink_ext_ack *extack)
2064 {
2065 struct ip6_tnl *t = netdev_priv(dev);
2066 struct __ip6_tnl_parm p;
2067 struct net *net = t->net;
2068 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2069 struct ip_tunnel_encap ipencap;
2070
2071 if (dev == ip6n->fb_tnl_dev)
2072 return -EINVAL;
2073
2074 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
2075 int err = ip6_tnl_encap_setup(t, &ipencap);
2076
2077 if (err < 0)
2078 return err;
2079 }
2080 ip6_tnl_netlink_parms(data, &p);
2081 if (p.collect_md)
2082 return -EINVAL;
2083
2084 t = ip6_tnl_locate(net, &p, 0);
2085 if (!IS_ERR(t)) {
2086 if (t->dev != dev)
2087 return -EEXIST;
2088 } else
2089 t = netdev_priv(dev);
2090
2091 return ip6_tnl_update(t, &p);
2092 }
2093
2094 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
2095 {
2096 struct net *net = dev_net(dev);
2097 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2098
2099 if (dev != ip6n->fb_tnl_dev)
2100 unregister_netdevice_queue(dev, head);
2101 }
2102
2103 static size_t ip6_tnl_get_size(const struct net_device *dev)
2104 {
2105 return
2106 /* IFLA_IPTUN_LINK */
2107 nla_total_size(4) +
2108 /* IFLA_IPTUN_LOCAL */
2109 nla_total_size(sizeof(struct in6_addr)) +
2110 /* IFLA_IPTUN_REMOTE */
2111 nla_total_size(sizeof(struct in6_addr)) +
2112 /* IFLA_IPTUN_TTL */
2113 nla_total_size(1) +
2114 /* IFLA_IPTUN_ENCAP_LIMIT */
2115 nla_total_size(1) +
2116 /* IFLA_IPTUN_FLOWINFO */
2117 nla_total_size(4) +
2118 /* IFLA_IPTUN_FLAGS */
2119 nla_total_size(4) +
2120 /* IFLA_IPTUN_PROTO */
2121 nla_total_size(1) +
2122 /* IFLA_IPTUN_ENCAP_TYPE */
2123 nla_total_size(2) +
2124 /* IFLA_IPTUN_ENCAP_FLAGS */
2125 nla_total_size(2) +
2126 /* IFLA_IPTUN_ENCAP_SPORT */
2127 nla_total_size(2) +
2128 /* IFLA_IPTUN_ENCAP_DPORT */
2129 nla_total_size(2) +
2130 /* IFLA_IPTUN_COLLECT_METADATA */
2131 nla_total_size(0) +
2132 /* IFLA_IPTUN_FWMARK */
2133 nla_total_size(4) +
2134 0;
2135 }
2136
2137 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
2138 {
2139 struct ip6_tnl *tunnel = netdev_priv(dev);
2140 struct __ip6_tnl_parm *parm = &tunnel->parms;
2141
2142 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
2143 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
2144 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
2145 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
2146 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
2147 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
2148 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
2149 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
2150 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
2151 goto nla_put_failure;
2152
2153 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
2154 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
2155 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
2156 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
2157 goto nla_put_failure;
2158
2159 if (parm->collect_md)
2160 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
2161 goto nla_put_failure;
2162
2163 return 0;
2164
2165 nla_put_failure:
2166 return -EMSGSIZE;
2167 }
2168
2169 struct net *ip6_tnl_get_link_net(const struct net_device *dev)
2170 {
2171 struct ip6_tnl *tunnel = netdev_priv(dev);
2172
2173 return tunnel->net;
2174 }
2175 EXPORT_SYMBOL(ip6_tnl_get_link_net);
2176
2177 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
2178 [IFLA_IPTUN_LINK] = { .type = NLA_U32 },
2179 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
2180 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
2181 [IFLA_IPTUN_TTL] = { .type = NLA_U8 },
2182 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
2183 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
2184 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
2185 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
2186 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
2187 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
2188 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
2189 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
2190 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
2191 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
2192 };
2193
2194 static struct rtnl_link_ops ip6_link_ops __read_mostly = {
2195 .kind = "ip6tnl",
2196 .maxtype = IFLA_IPTUN_MAX,
2197 .policy = ip6_tnl_policy,
2198 .priv_size = sizeof(struct ip6_tnl),
2199 .setup = ip6_tnl_dev_setup,
2200 .validate = ip6_tnl_validate,
2201 .newlink = ip6_tnl_newlink,
2202 .changelink = ip6_tnl_changelink,
2203 .dellink = ip6_tnl_dellink,
2204 .get_size = ip6_tnl_get_size,
2205 .fill_info = ip6_tnl_fill_info,
2206 .get_link_net = ip6_tnl_get_link_net,
2207 };
2208
2209 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
2210 .handler = ip4ip6_rcv,
2211 .err_handler = ip4ip6_err,
2212 .priority = 1,
2213 };
2214
2215 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
2216 .handler = ip6ip6_rcv,
2217 .err_handler = ip6ip6_err,
2218 .priority = 1,
2219 };
2220
2221 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
2222 {
2223 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2224 struct net_device *dev, *aux;
2225 int h;
2226 struct ip6_tnl *t;
2227
2228 for_each_netdev_safe(net, dev, aux)
2229 if (dev->rtnl_link_ops == &ip6_link_ops)
2230 unregister_netdevice_queue(dev, list);
2231
2232 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
2233 t = rtnl_dereference(ip6n->tnls_r_l[h]);
2234 while (t) {
2235 /* If dev is in the same netns, it has already
2236 * been added to the list by the previous loop.
2237 */
2238 if (!net_eq(dev_net(t->dev), net))
2239 unregister_netdevice_queue(t->dev, list);
2240 t = rtnl_dereference(t->next);
2241 }
2242 }
2243 }
2244
2245 static int __net_init ip6_tnl_init_net(struct net *net)
2246 {
2247 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
2248 struct ip6_tnl *t = NULL;
2249 int err;
2250
2251 ip6n->tnls[0] = ip6n->tnls_wc;
2252 ip6n->tnls[1] = ip6n->tnls_r_l;
2253
2254 if (!net_has_fallback_tunnels(net))
2255 return 0;
2256 err = -ENOMEM;
2257 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
2258 NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
2259
2260 if (!ip6n->fb_tnl_dev)
2261 goto err_alloc_dev;
2262 dev_net_set(ip6n->fb_tnl_dev, net);
2263 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
2264 /* FB netdevice is special: we have one, and only one per netns.
2265 * Allowing to move it to another netns is clearly unsafe.
2266 */
2267 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
2268
2269 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
2270 if (err < 0)
2271 goto err_register;
2272
2273 err = register_netdev(ip6n->fb_tnl_dev);
2274 if (err < 0)
2275 goto err_register;
2276
2277 t = netdev_priv(ip6n->fb_tnl_dev);
2278
2279 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
2280 return 0;
2281
2282 err_register:
2283 free_netdev(ip6n->fb_tnl_dev);
2284 err_alloc_dev:
2285 return err;
2286 }
2287
2288 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
2289 {
2290 struct net *net;
2291 LIST_HEAD(list);
2292
2293 rtnl_lock();
2294 list_for_each_entry(net, net_list, exit_list)
2295 ip6_tnl_destroy_tunnels(net, &list);
2296 unregister_netdevice_many(&list);
2297 rtnl_unlock();
2298 }
2299
2300 static struct pernet_operations ip6_tnl_net_ops = {
2301 .init = ip6_tnl_init_net,
2302 .exit_batch = ip6_tnl_exit_batch_net,
2303 .id = &ip6_tnl_net_id,
2304 .size = sizeof(struct ip6_tnl_net),
2305 };
2306
2307 /**
2308 * ip6_tunnel_init - register protocol and reserve needed resources
2309 *
2310 * Return: 0 on success
2311 **/
2312
2313 static int __init ip6_tunnel_init(void)
2314 {
2315 int err;
2316
2317 if (!ipv6_mod_enabled())
2318 return -EOPNOTSUPP;
2319
2320 err = register_pernet_device(&ip6_tnl_net_ops);
2321 if (err < 0)
2322 goto out_pernet;
2323
2324 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
2325 if (err < 0) {
2326 pr_err("%s: can't register ip4ip6\n", __func__);
2327 goto out_ip4ip6;
2328 }
2329
2330 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
2331 if (err < 0) {
2332 pr_err("%s: can't register ip6ip6\n", __func__);
2333 goto out_ip6ip6;
2334 }
2335 err = rtnl_link_register(&ip6_link_ops);
2336 if (err < 0)
2337 goto rtnl_link_failed;
2338
2339 return 0;
2340
2341 rtnl_link_failed:
2342 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
2343 out_ip6ip6:
2344 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
2345 out_ip4ip6:
2346 unregister_pernet_device(&ip6_tnl_net_ops);
2347 out_pernet:
2348 return err;
2349 }
2350
2351 /**
2352 * ip6_tunnel_cleanup - free resources and unregister protocol
2353 **/
2354
2355 static void __exit ip6_tunnel_cleanup(void)
2356 {
2357 rtnl_link_unregister(&ip6_link_ops);
2358 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
2359 pr_info("%s: can't deregister ip4ip6\n", __func__);
2360
2361 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
2362 pr_info("%s: can't deregister ip6ip6\n", __func__);
2363
2364 unregister_pernet_device(&ip6_tnl_net_ops);
2365 }
2366
2367 module_init(ip6_tunnel_init);
2368 module_exit(ip6_tunnel_cleanup);
Linux with added FPC-III support