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1/*
2 * IPv6 virtual tunneling interface
3 *
4 * Copyright (C) 2013 secunet Security Networks AG
5 *
6 * Author:
7 * Steffen Klassert <steffen.klassert@secunet.com>
8 *
9 * Based on:
10 * net/ipv6/ip6_tunnel.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
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
39#include <linux/uaccess.h>
40#include <linux/atomic.h>
41
42#include <net/icmp.h>
43#include <net/ip.h>
44#include <net/ip_tunnels.h>
45#include <net/ipv6.h>
46#include <net/ip6_route.h>
47#include <net/addrconf.h>
48#include <net/ip6_tunnel.h>
49#include <net/xfrm.h>
50#include <net/net_namespace.h>
51#include <net/netns/generic.h>
52
53#define HASH_SIZE_SHIFT 5
54#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
55
56static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
57{
58 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
59
60 return hash_32(hash, HASH_SIZE_SHIFT);
61}
62
63static int vti6_dev_init(struct net_device *dev);
64static void vti6_dev_setup(struct net_device *dev);
65static struct rtnl_link_ops vti6_link_ops __read_mostly;
66
67static int vti6_net_id __read_mostly;
68struct vti6_net {
69 /* the vti6 tunnel fallback device */
70 struct net_device *fb_tnl_dev;
71 /* lists for storing tunnels in use */
72 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE];
73 struct ip6_tnl __rcu *tnls_wc[1];
74 struct ip6_tnl __rcu **tnls[2];
75};
76
77#define for_each_vti6_tunnel_rcu(start) \
78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
79
80/**
81 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
82 * @net: network namespace
83 * @remote: the address of the tunnel exit-point
84 * @local: the address of the tunnel entry-point
85 *
86 * Return:
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
89 * else %NULL
90 **/
91static struct ip6_tnl *
92vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
93 const struct in6_addr *local)
94{
95 unsigned int hash = HASH(remote, local);
96 struct ip6_tnl *t;
97 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
98 struct in6_addr any;
99
100 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
101 if (ipv6_addr_equal(local, &t->parms.laddr) &&
102 ipv6_addr_equal(remote, &t->parms.raddr) &&
103 (t->dev->flags & IFF_UP))
104 return t;
105 }
106
107 memset(&any, 0, sizeof(any));
108 hash = HASH(&any, local);
109 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
110 if (ipv6_addr_equal(local, &t->parms.laddr) &&
111 (t->dev->flags & IFF_UP))
112 return t;
113 }
114
115 hash = HASH(remote, &any);
116 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
117 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
118 (t->dev->flags & IFF_UP))
119 return t;
120 }
121
122 t = rcu_dereference(ip6n->tnls_wc[0]);
123 if (t && (t->dev->flags & IFF_UP))
124 return t;
125
126 return NULL;
127}
128
129/**
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
132 *
133 * Description:
134 * vti6_tnl_bucket() returns the head of the list matching the
135 * &struct in6_addr entries laddr and raddr in @p.
136 *
137 * Return: head of IPv6 tunnel list
138 **/
139static struct ip6_tnl __rcu **
140vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
141{
142 const struct in6_addr *remote = &p->raddr;
143 const struct in6_addr *local = &p->laddr;
144 unsigned int h = 0;
145 int prio = 0;
146
147 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
148 prio = 1;
149 h = HASH(remote, local);
150 }
151 return &ip6n->tnls[prio][h];
152}
153
154static void
155vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
156{
157 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
158
159 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
160 rcu_assign_pointer(*tp, t);
161}
162
163static void
164vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
165{
166 struct ip6_tnl __rcu **tp;
167 struct ip6_tnl *iter;
168
169 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
170 (iter = rtnl_dereference(*tp)) != NULL;
171 tp = &iter->next) {
172 if (t == iter) {
173 rcu_assign_pointer(*tp, t->next);
174 break;
175 }
176 }
177}
178
179static void vti6_dev_free(struct net_device *dev)
180{
181 free_percpu(dev->tstats);
182 free_netdev(dev);
183}
184
185static int vti6_tnl_create2(struct net_device *dev)
186{
187 struct ip6_tnl *t = netdev_priv(dev);
188 struct net *net = dev_net(dev);
189 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
190 int err;
191
192 err = register_netdevice(dev);
193 if (err < 0)
194 goto out;
195
196 strcpy(t->parms.name, dev->name);
197 dev->rtnl_link_ops = &vti6_link_ops;
198
199 dev_hold(dev);
200 vti6_tnl_link(ip6n, t);
201
202 return 0;
203
204out:
205 return err;
206}
207
208static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
209{
210 struct net_device *dev;
211 struct ip6_tnl *t;
212 char name[IFNAMSIZ];
213 int err;
214
215 if (p->name[0])
216 strlcpy(name, p->name, IFNAMSIZ);
217 else
218 sprintf(name, "ip6_vti%%d");
219
220 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
221 if (!dev)
222 goto failed;
223
224 dev_net_set(dev, net);
225
226 t = netdev_priv(dev);
227 t->parms = *p;
228 t->net = dev_net(dev);
229
230 err = vti6_tnl_create2(dev);
231 if (err < 0)
232 goto failed_free;
233
234 return t;
235
236failed_free:
237 vti6_dev_free(dev);
238failed:
239 return NULL;
240}
241
242/**
243 * vti6_locate - find or create tunnel matching given parameters
244 * @net: network namespace
245 * @p: tunnel parameters
246 * @create: != 0 if allowed to create new tunnel if no match found
247 *
248 * Description:
249 * vti6_locate() first tries to locate an existing tunnel
250 * based on @parms. If this is unsuccessful, but @create is set a new
251 * tunnel device is created and registered for use.
252 *
253 * Return:
254 * matching tunnel or NULL
255 **/
256static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
257 int create)
258{
259 const struct in6_addr *remote = &p->raddr;
260 const struct in6_addr *local = &p->laddr;
261 struct ip6_tnl __rcu **tp;
262 struct ip6_tnl *t;
263 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
264
265 for (tp = vti6_tnl_bucket(ip6n, p);
266 (t = rtnl_dereference(*tp)) != NULL;
267 tp = &t->next) {
268 if (ipv6_addr_equal(local, &t->parms.laddr) &&
269 ipv6_addr_equal(remote, &t->parms.raddr)) {
270 if (create)
271 return NULL;
272
273 return t;
274 }
275 }
276 if (!create)
277 return NULL;
278 return vti6_tnl_create(net, p);
279}
280
281/**
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
284 *
285 * Description:
286 * vti6_dev_uninit() removes tunnel from its list
287 **/
288static void vti6_dev_uninit(struct net_device *dev)
289{
290 struct ip6_tnl *t = netdev_priv(dev);
291 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
292
293 if (dev == ip6n->fb_tnl_dev)
294 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
295 else
296 vti6_tnl_unlink(ip6n, t);
297 dev_put(dev);
298}
299
300static int vti6_rcv(struct sk_buff *skb)
301{
302 struct ip6_tnl *t;
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
304
305 rcu_read_lock();
306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
307 if (t) {
308 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
309 rcu_read_unlock();
310 goto discard;
311 }
312
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
314 rcu_read_unlock();
315 return 0;
316 }
317
318 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
319 t->dev->stats.rx_dropped++;
320 rcu_read_unlock();
321 goto discard;
322 }
323
324 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
325
326 rcu_read_unlock();
327
328 return xfrm6_rcv(skb);
329 }
330 rcu_read_unlock();
331 return -EINVAL;
332discard:
333 kfree_skb(skb);
334 return 0;
335}
336
337static int vti6_rcv_cb(struct sk_buff *skb, int err)
338{
339 unsigned short family;
340 struct net_device *dev;
341 struct pcpu_sw_netstats *tstats;
342 struct xfrm_state *x;
343 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
344 u32 orig_mark = skb->mark;
345 int ret;
346
347 if (!t)
348 return 1;
349
350 dev = t->dev;
351
352 if (err) {
353 dev->stats.rx_errors++;
354 dev->stats.rx_dropped++;
355
356 return 0;
357 }
358
359 x = xfrm_input_state(skb);
360 family = x->inner_mode->afinfo->family;
361
362 skb->mark = be32_to_cpu(t->parms.i_key);
363 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
364 skb->mark = orig_mark;
365
366 if (!ret)
367 return -EPERM;
368
369 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
370 skb->dev = dev;
371
372 tstats = this_cpu_ptr(dev->tstats);
373 u64_stats_update_begin(&tstats->syncp);
374 tstats->rx_packets++;
375 tstats->rx_bytes += skb->len;
376 u64_stats_update_end(&tstats->syncp);
377
378 return 0;
379}
380
381/**
382 * vti6_addr_conflict - compare packet addresses to tunnel's own
383 * @t: the outgoing tunnel device
384 * @hdr: IPv6 header from the incoming packet
385 *
386 * Description:
387 * Avoid trivial tunneling loop by checking that tunnel exit-point
388 * doesn't match source of incoming packet.
389 *
390 * Return:
391 * 1 if conflict,
392 * 0 else
393 **/
394static inline bool
395vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
396{
397 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
398}
399
400static bool vti6_state_check(const struct xfrm_state *x,
401 const struct in6_addr *dst,
402 const struct in6_addr *src)
403{
404 xfrm_address_t *daddr = (xfrm_address_t *)dst;
405 xfrm_address_t *saddr = (xfrm_address_t *)src;
406
407 /* if there is no transform then this tunnel is not functional.
408 * Or if the xfrm is not mode tunnel.
409 */
410 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
411 x->props.family != AF_INET6)
412 return false;
413
414 if (ipv6_addr_any(dst))
415 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
416
417 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
418 return false;
419
420 return true;
421}
422
423/**
424 * vti6_xmit - send a packet
425 * @skb: the outgoing socket buffer
426 * @dev: the outgoing tunnel device
427 * @fl: the flow informations for the xfrm_lookup
428 **/
429static int
430vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
431{
432 struct ip6_tnl *t = netdev_priv(dev);
433 struct net_device_stats *stats = &t->dev->stats;
434 struct dst_entry *dst = skb_dst(skb);
435 struct net_device *tdev;
436 struct xfrm_state *x;
437 int err = -1;
438 int mtu;
439
440 if (!dst)
441 goto tx_err_link_failure;
442
443 dst_hold(dst);
444 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
445 if (IS_ERR(dst)) {
446 err = PTR_ERR(dst);
447 dst = NULL;
448 goto tx_err_link_failure;
449 }
450
451 x = dst->xfrm;
452 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
453 goto tx_err_link_failure;
454
455 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
456 (const struct in6_addr *)&x->id.daddr))
457 goto tx_err_link_failure;
458
459 tdev = dst->dev;
460
461 if (tdev == dev) {
462 stats->collisions++;
463 net_warn_ratelimited("%s: Local routing loop detected!\n",
464 t->parms.name);
465 goto tx_err_dst_release;
466 }
467
468 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
469 skb_dst_set(skb, dst);
470 skb->dev = skb_dst(skb)->dev;
471
472 mtu = dst_mtu(dst);
473 if (!skb->ignore_df && skb->len > mtu) {
474 skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu);
475
476 if (skb->protocol == htons(ETH_P_IPV6))
477 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
478 else
479 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
480 htonl(mtu));
481
482 return -EMSGSIZE;
483 }
484
485 err = dst_output(t->net, skb->sk, skb);
486 if (net_xmit_eval(err) == 0) {
487 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
488
489 u64_stats_update_begin(&tstats->syncp);
490 tstats->tx_bytes += skb->len;
491 tstats->tx_packets++;
492 u64_stats_update_end(&tstats->syncp);
493 } else {
494 stats->tx_errors++;
495 stats->tx_aborted_errors++;
496 }
497
498 return 0;
499tx_err_link_failure:
500 stats->tx_carrier_errors++;
501 dst_link_failure(skb);
502tx_err_dst_release:
503 dst_release(dst);
504 return err;
505}
506
507static netdev_tx_t
508vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
509{
510 struct ip6_tnl *t = netdev_priv(dev);
511 struct net_device_stats *stats = &t->dev->stats;
512 struct ipv6hdr *ipv6h;
513 struct flowi fl;
514 int ret;
515
516 memset(&fl, 0, sizeof(fl));
517
518 switch (skb->protocol) {
519 case htons(ETH_P_IPV6):
520 ipv6h = ipv6_hdr(skb);
521
522 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
523 vti6_addr_conflict(t, ipv6h))
524 goto tx_err;
525
526 xfrm_decode_session(skb, &fl, AF_INET6);
527 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
528 break;
529 case htons(ETH_P_IP):
530 xfrm_decode_session(skb, &fl, AF_INET);
531 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
532 break;
533 default:
534 goto tx_err;
535 }
536
537 /* override mark with tunnel output key */
538 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
539
540 ret = vti6_xmit(skb, dev, &fl);
541 if (ret < 0)
542 goto tx_err;
543
544 return NETDEV_TX_OK;
545
546tx_err:
547 stats->tx_errors++;
548 stats->tx_dropped++;
549 kfree_skb(skb);
550 return NETDEV_TX_OK;
551}
552
553static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
554 u8 type, u8 code, int offset, __be32 info)
555{
556 __be32 spi;
557 __u32 mark;
558 struct xfrm_state *x;
559 struct ip6_tnl *t;
560 struct ip_esp_hdr *esph;
561 struct ip_auth_hdr *ah;
562 struct ip_comp_hdr *ipch;
563 struct net *net = dev_net(skb->dev);
564 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
565 int protocol = iph->nexthdr;
566
567 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
568 if (!t)
569 return -1;
570
571 mark = be32_to_cpu(t->parms.o_key);
572
573 switch (protocol) {
574 case IPPROTO_ESP:
575 esph = (struct ip_esp_hdr *)(skb->data + offset);
576 spi = esph->spi;
577 break;
578 case IPPROTO_AH:
579 ah = (struct ip_auth_hdr *)(skb->data + offset);
580 spi = ah->spi;
581 break;
582 case IPPROTO_COMP:
583 ipch = (struct ip_comp_hdr *)(skb->data + offset);
584 spi = htonl(ntohs(ipch->cpi));
585 break;
586 default:
587 return 0;
588 }
589
590 if (type != ICMPV6_PKT_TOOBIG &&
591 type != NDISC_REDIRECT)
592 return 0;
593
594 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
595 spi, protocol, AF_INET6);
596 if (!x)
597 return 0;
598
599 if (type == NDISC_REDIRECT)
600 ip6_redirect(skb, net, skb->dev->ifindex, 0);
601 else
602 ip6_update_pmtu(skb, net, info, 0, 0);
603 xfrm_state_put(x);
604
605 return 0;
606}
607
608static void vti6_link_config(struct ip6_tnl *t)
609{
610 struct net_device *dev = t->dev;
611 struct __ip6_tnl_parm *p = &t->parms;
612
613 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
614 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
615
616 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
617 IP6_TNL_F_CAP_PER_PACKET);
618 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
619
620 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
621 dev->flags |= IFF_POINTOPOINT;
622 else
623 dev->flags &= ~IFF_POINTOPOINT;
624}
625
626/**
627 * vti6_tnl_change - update the tunnel parameters
628 * @t: tunnel to be changed
629 * @p: tunnel configuration parameters
630 *
631 * Description:
632 * vti6_tnl_change() updates the tunnel parameters
633 **/
634static int
635vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
636{
637 t->parms.laddr = p->laddr;
638 t->parms.raddr = p->raddr;
639 t->parms.link = p->link;
640 t->parms.i_key = p->i_key;
641 t->parms.o_key = p->o_key;
642 t->parms.proto = p->proto;
643 dst_cache_reset(&t->dst_cache);
644 vti6_link_config(t);
645 return 0;
646}
647
648static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
649{
650 struct net *net = dev_net(t->dev);
651 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
652 int err;
653
654 vti6_tnl_unlink(ip6n, t);
655 synchronize_net();
656 err = vti6_tnl_change(t, p);
657 vti6_tnl_link(ip6n, t);
658 netdev_state_change(t->dev);
659 return err;
660}
661
662static void
663vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
664{
665 p->laddr = u->laddr;
666 p->raddr = u->raddr;
667 p->link = u->link;
668 p->i_key = u->i_key;
669 p->o_key = u->o_key;
670 p->proto = u->proto;
671
672 memcpy(p->name, u->name, sizeof(u->name));
673}
674
675static void
676vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
677{
678 u->laddr = p->laddr;
679 u->raddr = p->raddr;
680 u->link = p->link;
681 u->i_key = p->i_key;
682 u->o_key = p->o_key;
683 u->proto = p->proto;
684
685 memcpy(u->name, p->name, sizeof(u->name));
686}
687
688/**
689 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
690 * @dev: virtual device associated with tunnel
691 * @ifr: parameters passed from userspace
692 * @cmd: command to be performed
693 *
694 * Description:
695 * vti6_ioctl() is used for managing vti6 tunnels
696 * from userspace.
697 *
698 * The possible commands are the following:
699 * %SIOCGETTUNNEL: get tunnel parameters for device
700 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
701 * %SIOCCHGTUNNEL: change tunnel parameters to those given
702 * %SIOCDELTUNNEL: delete tunnel
703 *
704 * The fallback device "ip6_vti0", created during module
705 * initialization, can be used for creating other tunnel devices.
706 *
707 * Return:
708 * 0 on success,
709 * %-EFAULT if unable to copy data to or from userspace,
710 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
711 * %-EINVAL if passed tunnel parameters are invalid,
712 * %-EEXIST if changing a tunnel's parameters would cause a conflict
713 * %-ENODEV if attempting to change or delete a nonexisting device
714 **/
715static int
716vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
717{
718 int err = 0;
719 struct ip6_tnl_parm2 p;
720 struct __ip6_tnl_parm p1;
721 struct ip6_tnl *t = NULL;
722 struct net *net = dev_net(dev);
723 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
724
725 switch (cmd) {
726 case SIOCGETTUNNEL:
727 if (dev == ip6n->fb_tnl_dev) {
728 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
729 err = -EFAULT;
730 break;
731 }
732 vti6_parm_from_user(&p1, &p);
733 t = vti6_locate(net, &p1, 0);
734 } else {
735 memset(&p, 0, sizeof(p));
736 }
737 if (!t)
738 t = netdev_priv(dev);
739 vti6_parm_to_user(&p, &t->parms);
740 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
741 err = -EFAULT;
742 break;
743 case SIOCADDTUNNEL:
744 case SIOCCHGTUNNEL:
745 err = -EPERM;
746 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
747 break;
748 err = -EFAULT;
749 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
750 break;
751 err = -EINVAL;
752 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
753 break;
754 vti6_parm_from_user(&p1, &p);
755 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
756 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
757 if (t) {
758 if (t->dev != dev) {
759 err = -EEXIST;
760 break;
761 }
762 } else
763 t = netdev_priv(dev);
764
765 err = vti6_update(t, &p1);
766 }
767 if (t) {
768 err = 0;
769 vti6_parm_to_user(&p, &t->parms);
770 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
771 err = -EFAULT;
772
773 } else
774 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
775 break;
776 case SIOCDELTUNNEL:
777 err = -EPERM;
778 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
779 break;
780
781 if (dev == ip6n->fb_tnl_dev) {
782 err = -EFAULT;
783 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
784 break;
785 err = -ENOENT;
786 vti6_parm_from_user(&p1, &p);
787 t = vti6_locate(net, &p1, 0);
788 if (!t)
789 break;
790 err = -EPERM;
791 if (t->dev == ip6n->fb_tnl_dev)
792 break;
793 dev = t->dev;
794 }
795 err = 0;
796 unregister_netdevice(dev);
797 break;
798 default:
799 err = -EINVAL;
800 }
801 return err;
802}
803
804/**
805 * vti6_tnl_change_mtu - change mtu manually for tunnel device
806 * @dev: virtual device associated with tunnel
807 * @new_mtu: the new mtu
808 *
809 * Return:
810 * 0 on success,
811 * %-EINVAL if mtu too small
812 **/
813static int vti6_change_mtu(struct net_device *dev, int new_mtu)
814{
815 if (new_mtu < IPV6_MIN_MTU)
816 return -EINVAL;
817
818 dev->mtu = new_mtu;
819 return 0;
820}
821
822static const struct net_device_ops vti6_netdev_ops = {
823 .ndo_init = vti6_dev_init,
824 .ndo_uninit = vti6_dev_uninit,
825 .ndo_start_xmit = vti6_tnl_xmit,
826 .ndo_do_ioctl = vti6_ioctl,
827 .ndo_change_mtu = vti6_change_mtu,
828 .ndo_get_stats64 = ip_tunnel_get_stats64,
829 .ndo_get_iflink = ip6_tnl_get_iflink,
830};
831
832/**
833 * vti6_dev_setup - setup virtual tunnel device
834 * @dev: virtual device associated with tunnel
835 *
836 * Description:
837 * Initialize function pointers and device parameters
838 **/
839static void vti6_dev_setup(struct net_device *dev)
840{
841 dev->netdev_ops = &vti6_netdev_ops;
842 dev->destructor = vti6_dev_free;
843
844 dev->type = ARPHRD_TUNNEL6;
845 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
846 dev->mtu = ETH_DATA_LEN;
847 dev->flags |= IFF_NOARP;
848 dev->addr_len = sizeof(struct in6_addr);
849 netif_keep_dst(dev);
850}
851
852/**
853 * vti6_dev_init_gen - general initializer for all tunnel devices
854 * @dev: virtual device associated with tunnel
855 **/
856static inline int vti6_dev_init_gen(struct net_device *dev)
857{
858 struct ip6_tnl *t = netdev_priv(dev);
859
860 t->dev = dev;
861 t->net = dev_net(dev);
862 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
863 if (!dev->tstats)
864 return -ENOMEM;
865 return 0;
866}
867
868/**
869 * vti6_dev_init - initializer for all non fallback tunnel devices
870 * @dev: virtual device associated with tunnel
871 **/
872static int vti6_dev_init(struct net_device *dev)
873{
874 struct ip6_tnl *t = netdev_priv(dev);
875 int err = vti6_dev_init_gen(dev);
876
877 if (err)
878 return err;
879 vti6_link_config(t);
880 return 0;
881}
882
883/**
884 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
885 * @dev: fallback device
886 *
887 * Return: 0
888 **/
889static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
890{
891 struct ip6_tnl *t = netdev_priv(dev);
892 struct net *net = dev_net(dev);
893 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
894
895 t->parms.proto = IPPROTO_IPV6;
896 dev_hold(dev);
897
898 rcu_assign_pointer(ip6n->tnls_wc[0], t);
899 return 0;
900}
901
902static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
903{
904 return 0;
905}
906
907static void vti6_netlink_parms(struct nlattr *data[],
908 struct __ip6_tnl_parm *parms)
909{
910 memset(parms, 0, sizeof(*parms));
911
912 if (!data)
913 return;
914
915 if (data[IFLA_VTI_LINK])
916 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
917
918 if (data[IFLA_VTI_LOCAL])
919 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
920
921 if (data[IFLA_VTI_REMOTE])
922 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
923
924 if (data[IFLA_VTI_IKEY])
925 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
926
927 if (data[IFLA_VTI_OKEY])
928 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
929}
930
931static int vti6_newlink(struct net *src_net, struct net_device *dev,
932 struct nlattr *tb[], struct nlattr *data[])
933{
934 struct net *net = dev_net(dev);
935 struct ip6_tnl *nt;
936
937 nt = netdev_priv(dev);
938 vti6_netlink_parms(data, &nt->parms);
939
940 nt->parms.proto = IPPROTO_IPV6;
941
942 if (vti6_locate(net, &nt->parms, 0))
943 return -EEXIST;
944
945 return vti6_tnl_create2(dev);
946}
947
948static void vti6_dellink(struct net_device *dev, struct list_head *head)
949{
950 struct net *net = dev_net(dev);
951 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
952
953 if (dev != ip6n->fb_tnl_dev)
954 unregister_netdevice_queue(dev, head);
955}
956
957static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
958 struct nlattr *data[])
959{
960 struct ip6_tnl *t;
961 struct __ip6_tnl_parm p;
962 struct net *net = dev_net(dev);
963 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
964
965 if (dev == ip6n->fb_tnl_dev)
966 return -EINVAL;
967
968 vti6_netlink_parms(data, &p);
969
970 t = vti6_locate(net, &p, 0);
971
972 if (t) {
973 if (t->dev != dev)
974 return -EEXIST;
975 } else
976 t = netdev_priv(dev);
977
978 return vti6_update(t, &p);
979}
980
981static size_t vti6_get_size(const struct net_device *dev)
982{
983 return
984 /* IFLA_VTI_LINK */
985 nla_total_size(4) +
986 /* IFLA_VTI_LOCAL */
987 nla_total_size(sizeof(struct in6_addr)) +
988 /* IFLA_VTI_REMOTE */
989 nla_total_size(sizeof(struct in6_addr)) +
990 /* IFLA_VTI_IKEY */
991 nla_total_size(4) +
992 /* IFLA_VTI_OKEY */
993 nla_total_size(4) +
994 0;
995}
996
997static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
998{
999 struct ip6_tnl *tunnel = netdev_priv(dev);
1000 struct __ip6_tnl_parm *parm = &tunnel->parms;
1001
1002 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1003 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1004 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1005 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1006 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
1007 goto nla_put_failure;
1008 return 0;
1009
1010nla_put_failure:
1011 return -EMSGSIZE;
1012}
1013
1014static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1015 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1016 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1017 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1018 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1019 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1020};
1021
1022static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1023 .kind = "vti6",
1024 .maxtype = IFLA_VTI_MAX,
1025 .policy = vti6_policy,
1026 .priv_size = sizeof(struct ip6_tnl),
1027 .setup = vti6_dev_setup,
1028 .validate = vti6_validate,
1029 .newlink = vti6_newlink,
1030 .dellink = vti6_dellink,
1031 .changelink = vti6_changelink,
1032 .get_size = vti6_get_size,
1033 .fill_info = vti6_fill_info,
1034 .get_link_net = ip6_tnl_get_link_net,
1035};
1036
1037static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1038{
1039 int h;
1040 struct ip6_tnl *t;
1041 LIST_HEAD(list);
1042
1043 for (h = 0; h < HASH_SIZE; h++) {
1044 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1045 while (t) {
1046 unregister_netdevice_queue(t->dev, &list);
1047 t = rtnl_dereference(t->next);
1048 }
1049 }
1050
1051 t = rtnl_dereference(ip6n->tnls_wc[0]);
1052 unregister_netdevice_queue(t->dev, &list);
1053 unregister_netdevice_many(&list);
1054}
1055
1056static int __net_init vti6_init_net(struct net *net)
1057{
1058 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1059 struct ip6_tnl *t = NULL;
1060 int err;
1061
1062 ip6n->tnls[0] = ip6n->tnls_wc;
1063 ip6n->tnls[1] = ip6n->tnls_r_l;
1064
1065 err = -ENOMEM;
1066 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1067 NET_NAME_UNKNOWN, vti6_dev_setup);
1068
1069 if (!ip6n->fb_tnl_dev)
1070 goto err_alloc_dev;
1071 dev_net_set(ip6n->fb_tnl_dev, net);
1072 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1073
1074 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1075 if (err < 0)
1076 goto err_register;
1077
1078 err = register_netdev(ip6n->fb_tnl_dev);
1079 if (err < 0)
1080 goto err_register;
1081
1082 t = netdev_priv(ip6n->fb_tnl_dev);
1083
1084 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1085 return 0;
1086
1087err_register:
1088 vti6_dev_free(ip6n->fb_tnl_dev);
1089err_alloc_dev:
1090 return err;
1091}
1092
1093static void __net_exit vti6_exit_net(struct net *net)
1094{
1095 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1096
1097 rtnl_lock();
1098 vti6_destroy_tunnels(ip6n);
1099 rtnl_unlock();
1100}
1101
1102static struct pernet_operations vti6_net_ops = {
1103 .init = vti6_init_net,
1104 .exit = vti6_exit_net,
1105 .id = &vti6_net_id,
1106 .size = sizeof(struct vti6_net),
1107};
1108
1109static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1110 .handler = vti6_rcv,
1111 .cb_handler = vti6_rcv_cb,
1112 .err_handler = vti6_err,
1113 .priority = 100,
1114};
1115
1116static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1117 .handler = vti6_rcv,
1118 .cb_handler = vti6_rcv_cb,
1119 .err_handler = vti6_err,
1120 .priority = 100,
1121};
1122
1123static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1124 .handler = vti6_rcv,
1125 .cb_handler = vti6_rcv_cb,
1126 .err_handler = vti6_err,
1127 .priority = 100,
1128};
1129
1130/**
1131 * vti6_tunnel_init - register protocol and reserve needed resources
1132 *
1133 * Return: 0 on success
1134 **/
1135static int __init vti6_tunnel_init(void)
1136{
1137 const char *msg;
1138 int err;
1139
1140 msg = "tunnel device";
1141 err = register_pernet_device(&vti6_net_ops);
1142 if (err < 0)
1143 goto pernet_dev_failed;
1144
1145 msg = "tunnel protocols";
1146 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1147 if (err < 0)
1148 goto xfrm_proto_esp_failed;
1149 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1150 if (err < 0)
1151 goto xfrm_proto_ah_failed;
1152 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1153 if (err < 0)
1154 goto xfrm_proto_comp_failed;
1155
1156 msg = "netlink interface";
1157 err = rtnl_link_register(&vti6_link_ops);
1158 if (err < 0)
1159 goto rtnl_link_failed;
1160
1161 return 0;
1162
1163rtnl_link_failed:
1164 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1165xfrm_proto_comp_failed:
1166 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1167xfrm_proto_ah_failed:
1168 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1169xfrm_proto_esp_failed:
1170 unregister_pernet_device(&vti6_net_ops);
1171pernet_dev_failed:
1172 pr_err("vti6 init: failed to register %s\n", msg);
1173 return err;
1174}
1175
1176/**
1177 * vti6_tunnel_cleanup - free resources and unregister protocol
1178 **/
1179static void __exit vti6_tunnel_cleanup(void)
1180{
1181 rtnl_link_unregister(&vti6_link_ops);
1182 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1183 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1184 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1185 unregister_pernet_device(&vti6_net_ops);
1186}
1187
1188module_init(vti6_tunnel_init);
1189module_exit(vti6_tunnel_cleanup);
1190MODULE_LICENSE("GPL");
1191MODULE_ALIAS_RTNL_LINK("vti6");
1192MODULE_ALIAS_NETDEV("ip6_vti0");
1193MODULE_AUTHOR("Steffen Klassert");
1194MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 virtual tunneling interface
4 *
5 * Copyright (C) 2013 secunet Security Networks AG
6 *
7 * Author:
8 * Steffen Klassert <steffen.klassert@secunet.com>
9 *
10 * Based on:
11 * net/ipv6/ip6_tunnel.c
12 */
13
14#include <linux/module.h>
15#include <linux/capability.h>
16#include <linux/errno.h>
17#include <linux/types.h>
18#include <linux/sockios.h>
19#include <linux/icmp.h>
20#include <linux/if.h>
21#include <linux/in.h>
22#include <linux/ip.h>
23#include <linux/net.h>
24#include <linux/in6.h>
25#include <linux/netdevice.h>
26#include <linux/if_arp.h>
27#include <linux/icmpv6.h>
28#include <linux/init.h>
29#include <linux/route.h>
30#include <linux/rtnetlink.h>
31#include <linux/netfilter_ipv6.h>
32#include <linux/slab.h>
33#include <linux/hash.h>
34
35#include <linux/uaccess.h>
36#include <linux/atomic.h>
37
38#include <net/icmp.h>
39#include <net/ip.h>
40#include <net/ip_tunnels.h>
41#include <net/ipv6.h>
42#include <net/ip6_route.h>
43#include <net/addrconf.h>
44#include <net/ip6_tunnel.h>
45#include <net/xfrm.h>
46#include <net/net_namespace.h>
47#include <net/netns/generic.h>
48#include <linux/etherdevice.h>
49
50#define IP6_VTI_HASH_SIZE_SHIFT 5
51#define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
52
53static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
54{
55 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
56
57 return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
58}
59
60static int vti6_dev_init(struct net_device *dev);
61static void vti6_dev_setup(struct net_device *dev);
62static struct rtnl_link_ops vti6_link_ops __read_mostly;
63
64static unsigned int vti6_net_id __read_mostly;
65struct vti6_net {
66 /* the vti6 tunnel fallback device */
67 struct net_device *fb_tnl_dev;
68 /* lists for storing tunnels in use */
69 struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
70 struct ip6_tnl __rcu *tnls_wc[1];
71 struct ip6_tnl __rcu **tnls[2];
72};
73
74#define for_each_vti6_tunnel_rcu(start) \
75 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
76
77/**
78 * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
79 * @net: network namespace
80 * @remote: the address of the tunnel exit-point
81 * @local: the address of the tunnel entry-point
82 *
83 * Return:
84 * tunnel matching given end-points if found,
85 * else fallback tunnel if its device is up,
86 * else %NULL
87 **/
88static struct ip6_tnl *
89vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
90 const struct in6_addr *local)
91{
92 unsigned int hash = HASH(remote, local);
93 struct ip6_tnl *t;
94 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
95 struct in6_addr any;
96
97 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
98 if (ipv6_addr_equal(local, &t->parms.laddr) &&
99 ipv6_addr_equal(remote, &t->parms.raddr) &&
100 (t->dev->flags & IFF_UP))
101 return t;
102 }
103
104 memset(&any, 0, sizeof(any));
105 hash = HASH(&any, local);
106 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
107 if (ipv6_addr_equal(local, &t->parms.laddr) &&
108 (t->dev->flags & IFF_UP))
109 return t;
110 }
111
112 hash = HASH(remote, &any);
113 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
114 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
115 (t->dev->flags & IFF_UP))
116 return t;
117 }
118
119 t = rcu_dereference(ip6n->tnls_wc[0]);
120 if (t && (t->dev->flags & IFF_UP))
121 return t;
122
123 return NULL;
124}
125
126/**
127 * vti6_tnl_bucket - get head of list matching given tunnel parameters
128 * @p: parameters containing tunnel end-points
129 *
130 * Description:
131 * vti6_tnl_bucket() returns the head of the list matching the
132 * &struct in6_addr entries laddr and raddr in @p.
133 *
134 * Return: head of IPv6 tunnel list
135 **/
136static struct ip6_tnl __rcu **
137vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
138{
139 const struct in6_addr *remote = &p->raddr;
140 const struct in6_addr *local = &p->laddr;
141 unsigned int h = 0;
142 int prio = 0;
143
144 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
145 prio = 1;
146 h = HASH(remote, local);
147 }
148 return &ip6n->tnls[prio][h];
149}
150
151static void
152vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
153{
154 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
155
156 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
157 rcu_assign_pointer(*tp, t);
158}
159
160static void
161vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
162{
163 struct ip6_tnl __rcu **tp;
164 struct ip6_tnl *iter;
165
166 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
167 (iter = rtnl_dereference(*tp)) != NULL;
168 tp = &iter->next) {
169 if (t == iter) {
170 rcu_assign_pointer(*tp, t->next);
171 break;
172 }
173 }
174}
175
176static void vti6_dev_free(struct net_device *dev)
177{
178 free_percpu(dev->tstats);
179}
180
181static int vti6_tnl_create2(struct net_device *dev)
182{
183 struct ip6_tnl *t = netdev_priv(dev);
184 struct net *net = dev_net(dev);
185 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
186 int err;
187
188 dev->rtnl_link_ops = &vti6_link_ops;
189 err = register_netdevice(dev);
190 if (err < 0)
191 goto out;
192
193 strcpy(t->parms.name, dev->name);
194
195 dev_hold(dev);
196 vti6_tnl_link(ip6n, t);
197
198 return 0;
199
200out:
201 return err;
202}
203
204static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
205{
206 struct net_device *dev;
207 struct ip6_tnl *t;
208 char name[IFNAMSIZ];
209 int err;
210
211 if (p->name[0]) {
212 if (!dev_valid_name(p->name))
213 goto failed;
214 strlcpy(name, p->name, IFNAMSIZ);
215 } else {
216 sprintf(name, "ip6_vti%%d");
217 }
218
219 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
220 if (!dev)
221 goto failed;
222
223 dev_net_set(dev, net);
224
225 t = netdev_priv(dev);
226 t->parms = *p;
227 t->net = dev_net(dev);
228
229 err = vti6_tnl_create2(dev);
230 if (err < 0)
231 goto failed_free;
232
233 return t;
234
235failed_free:
236 free_netdev(dev);
237failed:
238 return NULL;
239}
240
241/**
242 * vti6_locate - find or create tunnel matching given parameters
243 * @net: network namespace
244 * @p: tunnel parameters
245 * @create: != 0 if allowed to create new tunnel if no match found
246 *
247 * Description:
248 * vti6_locate() first tries to locate an existing tunnel
249 * based on @parms. If this is unsuccessful, but @create is set a new
250 * tunnel device is created and registered for use.
251 *
252 * Return:
253 * matching tunnel or NULL
254 **/
255static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
256 int create)
257{
258 const struct in6_addr *remote = &p->raddr;
259 const struct in6_addr *local = &p->laddr;
260 struct ip6_tnl __rcu **tp;
261 struct ip6_tnl *t;
262 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
263
264 for (tp = vti6_tnl_bucket(ip6n, p);
265 (t = rtnl_dereference(*tp)) != NULL;
266 tp = &t->next) {
267 if (ipv6_addr_equal(local, &t->parms.laddr) &&
268 ipv6_addr_equal(remote, &t->parms.raddr)) {
269 if (create)
270 return NULL;
271
272 return t;
273 }
274 }
275 if (!create)
276 return NULL;
277 return vti6_tnl_create(net, p);
278}
279
280/**
281 * vti6_dev_uninit - tunnel device uninitializer
282 * @dev: the device to be destroyed
283 *
284 * Description:
285 * vti6_dev_uninit() removes tunnel from its list
286 **/
287static void vti6_dev_uninit(struct net_device *dev)
288{
289 struct ip6_tnl *t = netdev_priv(dev);
290 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
291
292 if (dev == ip6n->fb_tnl_dev)
293 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
294 else
295 vti6_tnl_unlink(ip6n, t);
296 dev_put(dev);
297}
298
299static int vti6_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
300 int encap_type)
301{
302 struct ip6_tnl *t;
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
304
305 rcu_read_lock();
306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
307 if (t) {
308 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
309 rcu_read_unlock();
310 goto discard;
311 }
312
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
314 rcu_read_unlock();
315 goto discard;
316 }
317
318 ipv6h = ipv6_hdr(skb);
319 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
320 t->dev->stats.rx_dropped++;
321 rcu_read_unlock();
322 goto discard;
323 }
324
325 rcu_read_unlock();
326
327 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
328 XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
329 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
330 return xfrm_input(skb, nexthdr, spi, encap_type);
331 }
332 rcu_read_unlock();
333 return -EINVAL;
334discard:
335 kfree_skb(skb);
336 return 0;
337}
338
339static int vti6_rcv(struct sk_buff *skb)
340{
341 int nexthdr = skb_network_header(skb)[IP6CB(skb)->nhoff];
342
343 return vti6_input_proto(skb, nexthdr, 0, 0);
344}
345
346static int vti6_rcv_cb(struct sk_buff *skb, int err)
347{
348 unsigned short family;
349 struct net_device *dev;
350 struct pcpu_sw_netstats *tstats;
351 struct xfrm_state *x;
352 const struct xfrm_mode *inner_mode;
353 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
354 u32 orig_mark = skb->mark;
355 int ret;
356
357 if (!t)
358 return 1;
359
360 dev = t->dev;
361
362 if (err) {
363 dev->stats.rx_errors++;
364 dev->stats.rx_dropped++;
365
366 return 0;
367 }
368
369 x = xfrm_input_state(skb);
370
371 inner_mode = &x->inner_mode;
372
373 if (x->sel.family == AF_UNSPEC) {
374 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
375 if (inner_mode == NULL) {
376 XFRM_INC_STATS(dev_net(skb->dev),
377 LINUX_MIB_XFRMINSTATEMODEERROR);
378 return -EINVAL;
379 }
380 }
381
382 family = inner_mode->family;
383
384 skb->mark = be32_to_cpu(t->parms.i_key);
385 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
386 skb->mark = orig_mark;
387
388 if (!ret)
389 return -EPERM;
390
391 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
392 skb->dev = dev;
393
394 tstats = this_cpu_ptr(dev->tstats);
395 u64_stats_update_begin(&tstats->syncp);
396 tstats->rx_packets++;
397 tstats->rx_bytes += skb->len;
398 u64_stats_update_end(&tstats->syncp);
399
400 return 0;
401}
402
403/**
404 * vti6_addr_conflict - compare packet addresses to tunnel's own
405 * @t: the outgoing tunnel device
406 * @hdr: IPv6 header from the incoming packet
407 *
408 * Description:
409 * Avoid trivial tunneling loop by checking that tunnel exit-point
410 * doesn't match source of incoming packet.
411 *
412 * Return:
413 * 1 if conflict,
414 * 0 else
415 **/
416static inline bool
417vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
418{
419 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
420}
421
422static bool vti6_state_check(const struct xfrm_state *x,
423 const struct in6_addr *dst,
424 const struct in6_addr *src)
425{
426 xfrm_address_t *daddr = (xfrm_address_t *)dst;
427 xfrm_address_t *saddr = (xfrm_address_t *)src;
428
429 /* if there is no transform then this tunnel is not functional.
430 * Or if the xfrm is not mode tunnel.
431 */
432 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
433 x->props.family != AF_INET6)
434 return false;
435
436 if (ipv6_addr_any(dst))
437 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
438
439 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
440 return false;
441
442 return true;
443}
444
445/**
446 * vti6_xmit - send a packet
447 * @skb: the outgoing socket buffer
448 * @dev: the outgoing tunnel device
449 * @fl: the flow informations for the xfrm_lookup
450 **/
451static int
452vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
453{
454 struct ip6_tnl *t = netdev_priv(dev);
455 struct net_device_stats *stats = &t->dev->stats;
456 struct dst_entry *dst = skb_dst(skb);
457 struct net_device *tdev;
458 struct xfrm_state *x;
459 int pkt_len = skb->len;
460 int err = -1;
461 int mtu;
462
463 if (!dst) {
464 switch (skb->protocol) {
465 case htons(ETH_P_IP): {
466 struct rtable *rt;
467
468 fl->u.ip4.flowi4_oif = dev->ifindex;
469 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
470 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
471 if (IS_ERR(rt))
472 goto tx_err_link_failure;
473 dst = &rt->dst;
474 skb_dst_set(skb, dst);
475 break;
476 }
477 case htons(ETH_P_IPV6):
478 fl->u.ip6.flowi6_oif = dev->ifindex;
479 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
480 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
481 if (dst->error) {
482 dst_release(dst);
483 dst = NULL;
484 goto tx_err_link_failure;
485 }
486 skb_dst_set(skb, dst);
487 break;
488 default:
489 goto tx_err_link_failure;
490 }
491 }
492
493 dst_hold(dst);
494 dst = xfrm_lookup_route(t->net, dst, fl, NULL, 0);
495 if (IS_ERR(dst)) {
496 err = PTR_ERR(dst);
497 dst = NULL;
498 goto tx_err_link_failure;
499 }
500
501 if (dst->flags & DST_XFRM_QUEUE)
502 goto queued;
503
504 x = dst->xfrm;
505 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
506 goto tx_err_link_failure;
507
508 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
509 (const struct in6_addr *)&x->id.daddr))
510 goto tx_err_link_failure;
511
512 tdev = dst->dev;
513
514 if (tdev == dev) {
515 stats->collisions++;
516 net_warn_ratelimited("%s: Local routing loop detected!\n",
517 t->parms.name);
518 goto tx_err_dst_release;
519 }
520
521 mtu = dst_mtu(dst);
522 if (skb->len > mtu) {
523 skb_dst_update_pmtu_no_confirm(skb, mtu);
524
525 if (skb->protocol == htons(ETH_P_IPV6)) {
526 if (mtu < IPV6_MIN_MTU)
527 mtu = IPV6_MIN_MTU;
528
529 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
530 } else {
531 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
532 htonl(mtu));
533 }
534
535 err = -EMSGSIZE;
536 goto tx_err_dst_release;
537 }
538
539queued:
540 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
541 skb_dst_set(skb, dst);
542 skb->dev = skb_dst(skb)->dev;
543
544 err = dst_output(t->net, skb->sk, skb);
545 if (net_xmit_eval(err) == 0)
546 err = pkt_len;
547 iptunnel_xmit_stats(dev, err);
548
549 return 0;
550tx_err_link_failure:
551 stats->tx_carrier_errors++;
552 dst_link_failure(skb);
553tx_err_dst_release:
554 dst_release(dst);
555 return err;
556}
557
558static netdev_tx_t
559vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
560{
561 struct ip6_tnl *t = netdev_priv(dev);
562 struct net_device_stats *stats = &t->dev->stats;
563 struct flowi fl;
564 int ret;
565
566 if (!pskb_inet_may_pull(skb))
567 goto tx_err;
568
569 memset(&fl, 0, sizeof(fl));
570
571 switch (skb->protocol) {
572 case htons(ETH_P_IPV6):
573 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
574 vti6_addr_conflict(t, ipv6_hdr(skb)))
575 goto tx_err;
576
577 xfrm_decode_session(skb, &fl, AF_INET6);
578 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
579 break;
580 case htons(ETH_P_IP):
581 xfrm_decode_session(skb, &fl, AF_INET);
582 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
583 break;
584 default:
585 goto tx_err;
586 }
587
588 /* override mark with tunnel output key */
589 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
590
591 ret = vti6_xmit(skb, dev, &fl);
592 if (ret < 0)
593 goto tx_err;
594
595 return NETDEV_TX_OK;
596
597tx_err:
598 stats->tx_errors++;
599 stats->tx_dropped++;
600 kfree_skb(skb);
601 return NETDEV_TX_OK;
602}
603
604static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
605 u8 type, u8 code, int offset, __be32 info)
606{
607 __be32 spi;
608 __u32 mark;
609 struct xfrm_state *x;
610 struct ip6_tnl *t;
611 struct ip_esp_hdr *esph;
612 struct ip_auth_hdr *ah;
613 struct ip_comp_hdr *ipch;
614 struct net *net = dev_net(skb->dev);
615 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
616 int protocol = iph->nexthdr;
617
618 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
619 if (!t)
620 return -1;
621
622 mark = be32_to_cpu(t->parms.o_key);
623
624 switch (protocol) {
625 case IPPROTO_ESP:
626 esph = (struct ip_esp_hdr *)(skb->data + offset);
627 spi = esph->spi;
628 break;
629 case IPPROTO_AH:
630 ah = (struct ip_auth_hdr *)(skb->data + offset);
631 spi = ah->spi;
632 break;
633 case IPPROTO_COMP:
634 ipch = (struct ip_comp_hdr *)(skb->data + offset);
635 spi = htonl(ntohs(ipch->cpi));
636 break;
637 default:
638 return 0;
639 }
640
641 if (type != ICMPV6_PKT_TOOBIG &&
642 type != NDISC_REDIRECT)
643 return 0;
644
645 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
646 spi, protocol, AF_INET6);
647 if (!x)
648 return 0;
649
650 if (type == NDISC_REDIRECT)
651 ip6_redirect(skb, net, skb->dev->ifindex, 0,
652 sock_net_uid(net, NULL));
653 else
654 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
655 xfrm_state_put(x);
656
657 return 0;
658}
659
660static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
661{
662 struct net_device *dev = t->dev;
663 struct __ip6_tnl_parm *p = &t->parms;
664 struct net_device *tdev = NULL;
665 int mtu;
666
667 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
668 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
669
670 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
671 IP6_TNL_F_CAP_PER_PACKET);
672 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
673
674 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
675 dev->flags |= IFF_POINTOPOINT;
676 else
677 dev->flags &= ~IFF_POINTOPOINT;
678
679 if (keep_mtu && dev->mtu) {
680 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
681 return;
682 }
683
684 if (p->flags & IP6_TNL_F_CAP_XMIT) {
685 int strict = (ipv6_addr_type(&p->raddr) &
686 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
687 struct rt6_info *rt = rt6_lookup(t->net,
688 &p->raddr, &p->laddr,
689 p->link, NULL, strict);
690
691 if (rt)
692 tdev = rt->dst.dev;
693 ip6_rt_put(rt);
694 }
695
696 if (!tdev && p->link)
697 tdev = __dev_get_by_index(t->net, p->link);
698
699 if (tdev)
700 mtu = tdev->mtu - sizeof(struct ipv6hdr);
701 else
702 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
703
704 dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
705}
706
707/**
708 * vti6_tnl_change - update the tunnel parameters
709 * @t: tunnel to be changed
710 * @p: tunnel configuration parameters
711 * @keep_mtu: MTU was set from userspace, don't re-compute it
712 *
713 * Description:
714 * vti6_tnl_change() updates the tunnel parameters
715 **/
716static int
717vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
718 bool keep_mtu)
719{
720 t->parms.laddr = p->laddr;
721 t->parms.raddr = p->raddr;
722 t->parms.link = p->link;
723 t->parms.i_key = p->i_key;
724 t->parms.o_key = p->o_key;
725 t->parms.proto = p->proto;
726 t->parms.fwmark = p->fwmark;
727 dst_cache_reset(&t->dst_cache);
728 vti6_link_config(t, keep_mtu);
729 return 0;
730}
731
732static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
733 bool keep_mtu)
734{
735 struct net *net = dev_net(t->dev);
736 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
737 int err;
738
739 vti6_tnl_unlink(ip6n, t);
740 synchronize_net();
741 err = vti6_tnl_change(t, p, keep_mtu);
742 vti6_tnl_link(ip6n, t);
743 netdev_state_change(t->dev);
744 return err;
745}
746
747static void
748vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
749{
750 p->laddr = u->laddr;
751 p->raddr = u->raddr;
752 p->link = u->link;
753 p->i_key = u->i_key;
754 p->o_key = u->o_key;
755 p->proto = u->proto;
756
757 memcpy(p->name, u->name, sizeof(u->name));
758}
759
760static void
761vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
762{
763 u->laddr = p->laddr;
764 u->raddr = p->raddr;
765 u->link = p->link;
766 u->i_key = p->i_key;
767 u->o_key = p->o_key;
768 if (u->i_key)
769 u->i_flags |= GRE_KEY;
770 if (u->o_key)
771 u->o_flags |= GRE_KEY;
772 u->proto = p->proto;
773
774 memcpy(u->name, p->name, sizeof(u->name));
775}
776
777/**
778 * vti6_ioctl - configure vti6 tunnels from userspace
779 * @dev: virtual device associated with tunnel
780 * @ifr: parameters passed from userspace
781 * @cmd: command to be performed
782 *
783 * Description:
784 * vti6_ioctl() is used for managing vti6 tunnels
785 * from userspace.
786 *
787 * The possible commands are the following:
788 * %SIOCGETTUNNEL: get tunnel parameters for device
789 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
790 * %SIOCCHGTUNNEL: change tunnel parameters to those given
791 * %SIOCDELTUNNEL: delete tunnel
792 *
793 * The fallback device "ip6_vti0", created during module
794 * initialization, can be used for creating other tunnel devices.
795 *
796 * Return:
797 * 0 on success,
798 * %-EFAULT if unable to copy data to or from userspace,
799 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
800 * %-EINVAL if passed tunnel parameters are invalid,
801 * %-EEXIST if changing a tunnel's parameters would cause a conflict
802 * %-ENODEV if attempting to change or delete a nonexisting device
803 **/
804static int
805vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
806{
807 int err = 0;
808 struct ip6_tnl_parm2 p;
809 struct __ip6_tnl_parm p1;
810 struct ip6_tnl *t = NULL;
811 struct net *net = dev_net(dev);
812 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
813
814 switch (cmd) {
815 case SIOCGETTUNNEL:
816 if (dev == ip6n->fb_tnl_dev) {
817 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
818 err = -EFAULT;
819 break;
820 }
821 vti6_parm_from_user(&p1, &p);
822 t = vti6_locate(net, &p1, 0);
823 } else {
824 memset(&p, 0, sizeof(p));
825 }
826 if (!t)
827 t = netdev_priv(dev);
828 vti6_parm_to_user(&p, &t->parms);
829 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
830 err = -EFAULT;
831 break;
832 case SIOCADDTUNNEL:
833 case SIOCCHGTUNNEL:
834 err = -EPERM;
835 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
836 break;
837 err = -EFAULT;
838 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
839 break;
840 err = -EINVAL;
841 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
842 break;
843 vti6_parm_from_user(&p1, &p);
844 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
845 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
846 if (t) {
847 if (t->dev != dev) {
848 err = -EEXIST;
849 break;
850 }
851 } else
852 t = netdev_priv(dev);
853
854 err = vti6_update(t, &p1, false);
855 }
856 if (t) {
857 err = 0;
858 vti6_parm_to_user(&p, &t->parms);
859 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
860 err = -EFAULT;
861
862 } else
863 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
864 break;
865 case SIOCDELTUNNEL:
866 err = -EPERM;
867 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
868 break;
869
870 if (dev == ip6n->fb_tnl_dev) {
871 err = -EFAULT;
872 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
873 break;
874 err = -ENOENT;
875 vti6_parm_from_user(&p1, &p);
876 t = vti6_locate(net, &p1, 0);
877 if (!t)
878 break;
879 err = -EPERM;
880 if (t->dev == ip6n->fb_tnl_dev)
881 break;
882 dev = t->dev;
883 }
884 err = 0;
885 unregister_netdevice(dev);
886 break;
887 default:
888 err = -EINVAL;
889 }
890 return err;
891}
892
893static const struct net_device_ops vti6_netdev_ops = {
894 .ndo_init = vti6_dev_init,
895 .ndo_uninit = vti6_dev_uninit,
896 .ndo_start_xmit = vti6_tnl_xmit,
897 .ndo_do_ioctl = vti6_ioctl,
898 .ndo_get_stats64 = ip_tunnel_get_stats64,
899 .ndo_get_iflink = ip6_tnl_get_iflink,
900};
901
902/**
903 * vti6_dev_setup - setup virtual tunnel device
904 * @dev: virtual device associated with tunnel
905 *
906 * Description:
907 * Initialize function pointers and device parameters
908 **/
909static void vti6_dev_setup(struct net_device *dev)
910{
911 dev->netdev_ops = &vti6_netdev_ops;
912 dev->header_ops = &ip_tunnel_header_ops;
913 dev->needs_free_netdev = true;
914 dev->priv_destructor = vti6_dev_free;
915
916 dev->type = ARPHRD_TUNNEL6;
917 dev->min_mtu = IPV4_MIN_MTU;
918 dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
919 dev->flags |= IFF_NOARP;
920 dev->addr_len = sizeof(struct in6_addr);
921 netif_keep_dst(dev);
922 /* This perm addr will be used as interface identifier by IPv6 */
923 dev->addr_assign_type = NET_ADDR_RANDOM;
924 eth_random_addr(dev->perm_addr);
925}
926
927/**
928 * vti6_dev_init_gen - general initializer for all tunnel devices
929 * @dev: virtual device associated with tunnel
930 **/
931static inline int vti6_dev_init_gen(struct net_device *dev)
932{
933 struct ip6_tnl *t = netdev_priv(dev);
934
935 t->dev = dev;
936 t->net = dev_net(dev);
937 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
938 if (!dev->tstats)
939 return -ENOMEM;
940 return 0;
941}
942
943/**
944 * vti6_dev_init - initializer for all non fallback tunnel devices
945 * @dev: virtual device associated with tunnel
946 **/
947static int vti6_dev_init(struct net_device *dev)
948{
949 struct ip6_tnl *t = netdev_priv(dev);
950 int err = vti6_dev_init_gen(dev);
951
952 if (err)
953 return err;
954 vti6_link_config(t, true);
955 return 0;
956}
957
958/**
959 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
960 * @dev: fallback device
961 *
962 * Return: 0
963 **/
964static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
965{
966 struct ip6_tnl *t = netdev_priv(dev);
967 struct net *net = dev_net(dev);
968 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
969
970 t->parms.proto = IPPROTO_IPV6;
971 dev_hold(dev);
972
973 rcu_assign_pointer(ip6n->tnls_wc[0], t);
974 return 0;
975}
976
977static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
978 struct netlink_ext_ack *extack)
979{
980 return 0;
981}
982
983static void vti6_netlink_parms(struct nlattr *data[],
984 struct __ip6_tnl_parm *parms)
985{
986 memset(parms, 0, sizeof(*parms));
987
988 if (!data)
989 return;
990
991 if (data[IFLA_VTI_LINK])
992 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
993
994 if (data[IFLA_VTI_LOCAL])
995 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
996
997 if (data[IFLA_VTI_REMOTE])
998 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
999
1000 if (data[IFLA_VTI_IKEY])
1001 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
1002
1003 if (data[IFLA_VTI_OKEY])
1004 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
1005
1006 if (data[IFLA_VTI_FWMARK])
1007 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1008}
1009
1010static int vti6_newlink(struct net *src_net, struct net_device *dev,
1011 struct nlattr *tb[], struct nlattr *data[],
1012 struct netlink_ext_ack *extack)
1013{
1014 struct net *net = dev_net(dev);
1015 struct ip6_tnl *nt;
1016
1017 nt = netdev_priv(dev);
1018 vti6_netlink_parms(data, &nt->parms);
1019
1020 nt->parms.proto = IPPROTO_IPV6;
1021
1022 if (vti6_locate(net, &nt->parms, 0))
1023 return -EEXIST;
1024
1025 return vti6_tnl_create2(dev);
1026}
1027
1028static void vti6_dellink(struct net_device *dev, struct list_head *head)
1029{
1030 struct net *net = dev_net(dev);
1031 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1032
1033 if (dev != ip6n->fb_tnl_dev)
1034 unregister_netdevice_queue(dev, head);
1035}
1036
1037static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1038 struct nlattr *data[],
1039 struct netlink_ext_ack *extack)
1040{
1041 struct ip6_tnl *t;
1042 struct __ip6_tnl_parm p;
1043 struct net *net = dev_net(dev);
1044 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1045
1046 if (dev == ip6n->fb_tnl_dev)
1047 return -EINVAL;
1048
1049 vti6_netlink_parms(data, &p);
1050
1051 t = vti6_locate(net, &p, 0);
1052
1053 if (t) {
1054 if (t->dev != dev)
1055 return -EEXIST;
1056 } else
1057 t = netdev_priv(dev);
1058
1059 return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1060}
1061
1062static size_t vti6_get_size(const struct net_device *dev)
1063{
1064 return
1065 /* IFLA_VTI_LINK */
1066 nla_total_size(4) +
1067 /* IFLA_VTI_LOCAL */
1068 nla_total_size(sizeof(struct in6_addr)) +
1069 /* IFLA_VTI_REMOTE */
1070 nla_total_size(sizeof(struct in6_addr)) +
1071 /* IFLA_VTI_IKEY */
1072 nla_total_size(4) +
1073 /* IFLA_VTI_OKEY */
1074 nla_total_size(4) +
1075 /* IFLA_VTI_FWMARK */
1076 nla_total_size(4) +
1077 0;
1078}
1079
1080static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1081{
1082 struct ip6_tnl *tunnel = netdev_priv(dev);
1083 struct __ip6_tnl_parm *parm = &tunnel->parms;
1084
1085 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1086 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1087 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1088 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1089 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1090 nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1091 goto nla_put_failure;
1092 return 0;
1093
1094nla_put_failure:
1095 return -EMSGSIZE;
1096}
1097
1098static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1099 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1100 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1101 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1102 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1103 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1104 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1105};
1106
1107static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1108 .kind = "vti6",
1109 .maxtype = IFLA_VTI_MAX,
1110 .policy = vti6_policy,
1111 .priv_size = sizeof(struct ip6_tnl),
1112 .setup = vti6_dev_setup,
1113 .validate = vti6_validate,
1114 .newlink = vti6_newlink,
1115 .dellink = vti6_dellink,
1116 .changelink = vti6_changelink,
1117 .get_size = vti6_get_size,
1118 .fill_info = vti6_fill_info,
1119 .get_link_net = ip6_tnl_get_link_net,
1120};
1121
1122static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1123 struct list_head *list)
1124{
1125 int h;
1126 struct ip6_tnl *t;
1127
1128 for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1129 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1130 while (t) {
1131 unregister_netdevice_queue(t->dev, list);
1132 t = rtnl_dereference(t->next);
1133 }
1134 }
1135
1136 t = rtnl_dereference(ip6n->tnls_wc[0]);
1137 if (t)
1138 unregister_netdevice_queue(t->dev, list);
1139}
1140
1141static int __net_init vti6_init_net(struct net *net)
1142{
1143 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1144 struct ip6_tnl *t = NULL;
1145 int err;
1146
1147 ip6n->tnls[0] = ip6n->tnls_wc;
1148 ip6n->tnls[1] = ip6n->tnls_r_l;
1149
1150 if (!net_has_fallback_tunnels(net))
1151 return 0;
1152 err = -ENOMEM;
1153 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1154 NET_NAME_UNKNOWN, vti6_dev_setup);
1155
1156 if (!ip6n->fb_tnl_dev)
1157 goto err_alloc_dev;
1158 dev_net_set(ip6n->fb_tnl_dev, net);
1159 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1160
1161 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1162 if (err < 0)
1163 goto err_register;
1164
1165 err = register_netdev(ip6n->fb_tnl_dev);
1166 if (err < 0)
1167 goto err_register;
1168
1169 t = netdev_priv(ip6n->fb_tnl_dev);
1170
1171 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1172 return 0;
1173
1174err_register:
1175 free_netdev(ip6n->fb_tnl_dev);
1176err_alloc_dev:
1177 return err;
1178}
1179
1180static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1181{
1182 struct vti6_net *ip6n;
1183 struct net *net;
1184 LIST_HEAD(list);
1185
1186 rtnl_lock();
1187 list_for_each_entry(net, net_list, exit_list) {
1188 ip6n = net_generic(net, vti6_net_id);
1189 vti6_destroy_tunnels(ip6n, &list);
1190 }
1191 unregister_netdevice_many(&list);
1192 rtnl_unlock();
1193}
1194
1195static struct pernet_operations vti6_net_ops = {
1196 .init = vti6_init_net,
1197 .exit_batch = vti6_exit_batch_net,
1198 .id = &vti6_net_id,
1199 .size = sizeof(struct vti6_net),
1200};
1201
1202static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1203 .handler = vti6_rcv,
1204 .input_handler = vti6_input_proto,
1205 .cb_handler = vti6_rcv_cb,
1206 .err_handler = vti6_err,
1207 .priority = 100,
1208};
1209
1210static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1211 .handler = vti6_rcv,
1212 .input_handler = vti6_input_proto,
1213 .cb_handler = vti6_rcv_cb,
1214 .err_handler = vti6_err,
1215 .priority = 100,
1216};
1217
1218static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1219 .handler = vti6_rcv,
1220 .input_handler = vti6_input_proto,
1221 .cb_handler = vti6_rcv_cb,
1222 .err_handler = vti6_err,
1223 .priority = 100,
1224};
1225
1226#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1227static int vti6_rcv_tunnel(struct sk_buff *skb)
1228{
1229 const xfrm_address_t *saddr;
1230 __be32 spi;
1231
1232 saddr = (const xfrm_address_t *)&ipv6_hdr(skb)->saddr;
1233 spi = xfrm6_tunnel_spi_lookup(dev_net(skb->dev), saddr);
1234
1235 return vti6_input_proto(skb, IPPROTO_IPV6, spi, 0);
1236}
1237
1238static struct xfrm6_tunnel vti_ipv6_handler __read_mostly = {
1239 .handler = vti6_rcv_tunnel,
1240 .cb_handler = vti6_rcv_cb,
1241 .err_handler = vti6_err,
1242 .priority = 0,
1243};
1244
1245static struct xfrm6_tunnel vti_ip6ip_handler __read_mostly = {
1246 .handler = vti6_rcv_tunnel,
1247 .cb_handler = vti6_rcv_cb,
1248 .err_handler = vti6_err,
1249 .priority = 0,
1250};
1251#endif
1252
1253/**
1254 * vti6_tunnel_init - register protocol and reserve needed resources
1255 *
1256 * Return: 0 on success
1257 **/
1258static int __init vti6_tunnel_init(void)
1259{
1260 const char *msg;
1261 int err;
1262
1263 msg = "tunnel device";
1264 err = register_pernet_device(&vti6_net_ops);
1265 if (err < 0)
1266 goto pernet_dev_failed;
1267
1268 msg = "tunnel protocols";
1269 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1270 if (err < 0)
1271 goto xfrm_proto_esp_failed;
1272 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1273 if (err < 0)
1274 goto xfrm_proto_ah_failed;
1275 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1276 if (err < 0)
1277 goto xfrm_proto_comp_failed;
1278#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1279 msg = "ipv6 tunnel";
1280 err = xfrm6_tunnel_register(&vti_ipv6_handler, AF_INET6);
1281 if (err < 0)
1282 goto vti_tunnel_ipv6_failed;
1283 err = xfrm6_tunnel_register(&vti_ip6ip_handler, AF_INET);
1284 if (err < 0)
1285 goto vti_tunnel_ip6ip_failed;
1286#endif
1287
1288 msg = "netlink interface";
1289 err = rtnl_link_register(&vti6_link_ops);
1290 if (err < 0)
1291 goto rtnl_link_failed;
1292
1293 return 0;
1294
1295rtnl_link_failed:
1296#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1297 err = xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1298vti_tunnel_ip6ip_failed:
1299 err = xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1300vti_tunnel_ipv6_failed:
1301#endif
1302 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1303xfrm_proto_comp_failed:
1304 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1305xfrm_proto_ah_failed:
1306 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1307xfrm_proto_esp_failed:
1308 unregister_pernet_device(&vti6_net_ops);
1309pernet_dev_failed:
1310 pr_err("vti6 init: failed to register %s\n", msg);
1311 return err;
1312}
1313
1314/**
1315 * vti6_tunnel_cleanup - free resources and unregister protocol
1316 **/
1317static void __exit vti6_tunnel_cleanup(void)
1318{
1319 rtnl_link_unregister(&vti6_link_ops);
1320#if IS_REACHABLE(CONFIG_INET6_XFRM_TUNNEL)
1321 xfrm6_tunnel_deregister(&vti_ip6ip_handler, AF_INET);
1322 xfrm6_tunnel_deregister(&vti_ipv6_handler, AF_INET6);
1323#endif
1324 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1325 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1326 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1327 unregister_pernet_device(&vti6_net_ops);
1328}
1329
1330module_init(vti6_tunnel_init);
1331module_exit(vti6_tunnel_cleanup);
1332MODULE_LICENSE("GPL");
1333MODULE_ALIAS_RTNL_LINK("vti6");
1334MODULE_ALIAS_NETDEV("ip6_vti0");
1335MODULE_AUTHOR("Steffen Klassert");
1336MODULE_DESCRIPTION("IPv6 virtual tunnel interface");