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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
99 for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
100 if (ipv6_addr_equal(local, &t->parms.laddr) &&
101 ipv6_addr_equal(remote, &t->parms.raddr) &&
102 (t->dev->flags & IFF_UP))
103 return t;
104 }
105 t = rcu_dereference(ip6n->tnls_wc[0]);
106 if (t && (t->dev->flags & IFF_UP))
107 return t;
108
109 return NULL;
110}
111
112/**
113 * vti6_tnl_bucket - get head of list matching given tunnel parameters
114 * @p: parameters containing tunnel end-points
115 *
116 * Description:
117 * vti6_tnl_bucket() returns the head of the list matching the
118 * &struct in6_addr entries laddr and raddr in @p.
119 *
120 * Return: head of IPv6 tunnel list
121 **/
122static struct ip6_tnl __rcu **
123vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
124{
125 const struct in6_addr *remote = &p->raddr;
126 const struct in6_addr *local = &p->laddr;
127 unsigned int h = 0;
128 int prio = 0;
129
130 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
131 prio = 1;
132 h = HASH(remote, local);
133 }
134 return &ip6n->tnls[prio][h];
135}
136
137static void
138vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
139{
140 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
141
142 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
143 rcu_assign_pointer(*tp, t);
144}
145
146static void
147vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
148{
149 struct ip6_tnl __rcu **tp;
150 struct ip6_tnl *iter;
151
152 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
153 (iter = rtnl_dereference(*tp)) != NULL;
154 tp = &iter->next) {
155 if (t == iter) {
156 rcu_assign_pointer(*tp, t->next);
157 break;
158 }
159 }
160}
161
162static void vti6_dev_free(struct net_device *dev)
163{
164 free_percpu(dev->tstats);
165 free_netdev(dev);
166}
167
168static int vti6_tnl_create2(struct net_device *dev)
169{
170 struct ip6_tnl *t = netdev_priv(dev);
171 struct net *net = dev_net(dev);
172 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
173 int err;
174
175 err = vti6_dev_init(dev);
176 if (err < 0)
177 goto out;
178
179 err = register_netdevice(dev);
180 if (err < 0)
181 goto out;
182
183 strcpy(t->parms.name, dev->name);
184 dev->rtnl_link_ops = &vti6_link_ops;
185
186 dev_hold(dev);
187 vti6_tnl_link(ip6n, t);
188
189 return 0;
190
191out:
192 return err;
193}
194
195static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
196{
197 struct net_device *dev;
198 struct ip6_tnl *t;
199 char name[IFNAMSIZ];
200 int err;
201
202 if (p->name[0])
203 strlcpy(name, p->name, IFNAMSIZ);
204 else
205 sprintf(name, "ip6_vti%%d");
206
207 dev = alloc_netdev(sizeof(*t), name, vti6_dev_setup);
208 if (dev == NULL)
209 goto failed;
210
211 dev_net_set(dev, net);
212
213 t = netdev_priv(dev);
214 t->parms = *p;
215 t->net = dev_net(dev);
216
217 err = vti6_tnl_create2(dev);
218 if (err < 0)
219 goto failed_free;
220
221 return t;
222
223failed_free:
224 vti6_dev_free(dev);
225failed:
226 return NULL;
227}
228
229/**
230 * vti6_locate - find or create tunnel matching given parameters
231 * @net: network namespace
232 * @p: tunnel parameters
233 * @create: != 0 if allowed to create new tunnel if no match found
234 *
235 * Description:
236 * vti6_locate() first tries to locate an existing tunnel
237 * based on @parms. If this is unsuccessful, but @create is set a new
238 * tunnel device is created and registered for use.
239 *
240 * Return:
241 * matching tunnel or NULL
242 **/
243static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
244 int create)
245{
246 const struct in6_addr *remote = &p->raddr;
247 const struct in6_addr *local = &p->laddr;
248 struct ip6_tnl __rcu **tp;
249 struct ip6_tnl *t;
250 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
251
252 for (tp = vti6_tnl_bucket(ip6n, p);
253 (t = rtnl_dereference(*tp)) != NULL;
254 tp = &t->next) {
255 if (ipv6_addr_equal(local, &t->parms.laddr) &&
256 ipv6_addr_equal(remote, &t->parms.raddr))
257 return t;
258 }
259 if (!create)
260 return NULL;
261 return vti6_tnl_create(net, p);
262}
263
264/**
265 * vti6_dev_uninit - tunnel device uninitializer
266 * @dev: the device to be destroyed
267 *
268 * Description:
269 * vti6_dev_uninit() removes tunnel from its list
270 **/
271static void vti6_dev_uninit(struct net_device *dev)
272{
273 struct ip6_tnl *t = netdev_priv(dev);
274 struct net *net = dev_net(dev);
275 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
276
277 if (dev == ip6n->fb_tnl_dev)
278 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
279 else
280 vti6_tnl_unlink(ip6n, t);
281 dev_put(dev);
282}
283
284static int vti6_rcv(struct sk_buff *skb)
285{
286 struct ip6_tnl *t;
287 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
288
289 rcu_read_lock();
290 if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
291 &ipv6h->daddr)) != NULL) {
292 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
293 rcu_read_unlock();
294 goto discard;
295 }
296
297 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
298 rcu_read_unlock();
299 return 0;
300 }
301
302 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
303 t->dev->stats.rx_dropped++;
304 rcu_read_unlock();
305 goto discard;
306 }
307
308 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
309 skb->mark = be32_to_cpu(t->parms.i_key);
310
311 rcu_read_unlock();
312
313 return xfrm6_rcv(skb);
314 }
315 rcu_read_unlock();
316 return -EINVAL;
317discard:
318 kfree_skb(skb);
319 return 0;
320}
321
322static int vti6_rcv_cb(struct sk_buff *skb, int err)
323{
324 unsigned short family;
325 struct net_device *dev;
326 struct pcpu_sw_netstats *tstats;
327 struct xfrm_state *x;
328 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
329
330 if (!t)
331 return 1;
332
333 dev = t->dev;
334
335 if (err) {
336 dev->stats.rx_errors++;
337 dev->stats.rx_dropped++;
338
339 return 0;
340 }
341
342 x = xfrm_input_state(skb);
343 family = x->inner_mode->afinfo->family;
344
345 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
346 return -EPERM;
347
348 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
349 skb->dev = dev;
350
351 tstats = this_cpu_ptr(dev->tstats);
352 u64_stats_update_begin(&tstats->syncp);
353 tstats->rx_packets++;
354 tstats->rx_bytes += skb->len;
355 u64_stats_update_end(&tstats->syncp);
356
357 return 0;
358}
359
360/**
361 * vti6_addr_conflict - compare packet addresses to tunnel's own
362 * @t: the outgoing tunnel device
363 * @hdr: IPv6 header from the incoming packet
364 *
365 * Description:
366 * Avoid trivial tunneling loop by checking that tunnel exit-point
367 * doesn't match source of incoming packet.
368 *
369 * Return:
370 * 1 if conflict,
371 * 0 else
372 **/
373static inline bool
374vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
375{
376 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
377}
378
379static bool vti6_state_check(const struct xfrm_state *x,
380 const struct in6_addr *dst,
381 const struct in6_addr *src)
382{
383 xfrm_address_t *daddr = (xfrm_address_t *)dst;
384 xfrm_address_t *saddr = (xfrm_address_t *)src;
385
386 /* if there is no transform then this tunnel is not functional.
387 * Or if the xfrm is not mode tunnel.
388 */
389 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
390 x->props.family != AF_INET6)
391 return false;
392
393 if (ipv6_addr_any(dst))
394 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
395
396 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
397 return false;
398
399 return true;
400}
401
402/**
403 * vti6_xmit - send a packet
404 * @skb: the outgoing socket buffer
405 * @dev: the outgoing tunnel device
406 * @fl: the flow informations for the xfrm_lookup
407 **/
408static int
409vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
410{
411 struct ip6_tnl *t = netdev_priv(dev);
412 struct net_device_stats *stats = &t->dev->stats;
413 struct dst_entry *dst = skb_dst(skb);
414 struct net_device *tdev;
415 int err = -1;
416
417 if (!dst)
418 goto tx_err_link_failure;
419
420 dst_hold(dst);
421 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
422 if (IS_ERR(dst)) {
423 err = PTR_ERR(dst);
424 dst = NULL;
425 goto tx_err_link_failure;
426 }
427
428 if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr))
429 goto tx_err_link_failure;
430
431 tdev = dst->dev;
432
433 if (tdev == dev) {
434 stats->collisions++;
435 net_warn_ratelimited("%s: Local routing loop detected!\n",
436 t->parms.name);
437 goto tx_err_dst_release;
438 }
439
440 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
441 skb_dst_set(skb, dst);
442 skb->dev = skb_dst(skb)->dev;
443
444 err = dst_output(skb);
445 if (net_xmit_eval(err) == 0) {
446 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
447
448 u64_stats_update_begin(&tstats->syncp);
449 tstats->tx_bytes += skb->len;
450 tstats->tx_packets++;
451 u64_stats_update_end(&tstats->syncp);
452 } else {
453 stats->tx_errors++;
454 stats->tx_aborted_errors++;
455 }
456
457 return 0;
458tx_err_link_failure:
459 stats->tx_carrier_errors++;
460 dst_link_failure(skb);
461tx_err_dst_release:
462 dst_release(dst);
463 return err;
464}
465
466static netdev_tx_t
467vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
468{
469 struct ip6_tnl *t = netdev_priv(dev);
470 struct net_device_stats *stats = &t->dev->stats;
471 struct ipv6hdr *ipv6h;
472 struct flowi fl;
473 int ret;
474
475 memset(&fl, 0, sizeof(fl));
476 skb->mark = be32_to_cpu(t->parms.o_key);
477
478 switch (skb->protocol) {
479 case htons(ETH_P_IPV6):
480 ipv6h = ipv6_hdr(skb);
481
482 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
483 !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h))
484 goto tx_err;
485
486 xfrm_decode_session(skb, &fl, AF_INET6);
487 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
488 break;
489 case htons(ETH_P_IP):
490 xfrm_decode_session(skb, &fl, AF_INET);
491 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
492 break;
493 default:
494 goto tx_err;
495 }
496
497 ret = vti6_xmit(skb, dev, &fl);
498 if (ret < 0)
499 goto tx_err;
500
501 return NETDEV_TX_OK;
502
503tx_err:
504 stats->tx_errors++;
505 stats->tx_dropped++;
506 kfree_skb(skb);
507 return NETDEV_TX_OK;
508}
509
510static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
511 u8 type, u8 code, int offset, __be32 info)
512{
513 __be32 spi;
514 __u32 mark;
515 struct xfrm_state *x;
516 struct ip6_tnl *t;
517 struct ip_esp_hdr *esph;
518 struct ip_auth_hdr *ah;
519 struct ip_comp_hdr *ipch;
520 struct net *net = dev_net(skb->dev);
521 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
522 int protocol = iph->nexthdr;
523
524 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
525 if (!t)
526 return -1;
527
528 mark = be32_to_cpu(t->parms.o_key);
529
530 switch (protocol) {
531 case IPPROTO_ESP:
532 esph = (struct ip_esp_hdr *)(skb->data + offset);
533 spi = esph->spi;
534 break;
535 case IPPROTO_AH:
536 ah = (struct ip_auth_hdr *)(skb->data + offset);
537 spi = ah->spi;
538 break;
539 case IPPROTO_COMP:
540 ipch = (struct ip_comp_hdr *)(skb->data + offset);
541 spi = htonl(ntohs(ipch->cpi));
542 break;
543 default:
544 return 0;
545 }
546
547 if (type != ICMPV6_PKT_TOOBIG &&
548 type != NDISC_REDIRECT)
549 return 0;
550
551 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
552 spi, protocol, AF_INET6);
553 if (!x)
554 return 0;
555
556 if (type == NDISC_REDIRECT)
557 ip6_redirect(skb, net, skb->dev->ifindex, 0);
558 else
559 ip6_update_pmtu(skb, net, info, 0, 0);
560 xfrm_state_put(x);
561
562 return 0;
563}
564
565static void vti6_link_config(struct ip6_tnl *t)
566{
567 struct net_device *dev = t->dev;
568 struct __ip6_tnl_parm *p = &t->parms;
569
570 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
571 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
572
573 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
574 IP6_TNL_F_CAP_PER_PACKET);
575 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
576
577 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
578 dev->flags |= IFF_POINTOPOINT;
579 else
580 dev->flags &= ~IFF_POINTOPOINT;
581
582 dev->iflink = p->link;
583}
584
585/**
586 * vti6_tnl_change - update the tunnel parameters
587 * @t: tunnel to be changed
588 * @p: tunnel configuration parameters
589 *
590 * Description:
591 * vti6_tnl_change() updates the tunnel parameters
592 **/
593static int
594vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
595{
596 t->parms.laddr = p->laddr;
597 t->parms.raddr = p->raddr;
598 t->parms.link = p->link;
599 t->parms.i_key = p->i_key;
600 t->parms.o_key = p->o_key;
601 t->parms.proto = p->proto;
602 ip6_tnl_dst_reset(t);
603 vti6_link_config(t);
604 return 0;
605}
606
607static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
608{
609 struct net *net = dev_net(t->dev);
610 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
611 int err;
612
613 vti6_tnl_unlink(ip6n, t);
614 synchronize_net();
615 err = vti6_tnl_change(t, p);
616 vti6_tnl_link(ip6n, t);
617 netdev_state_change(t->dev);
618 return err;
619}
620
621static void
622vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
623{
624 p->laddr = u->laddr;
625 p->raddr = u->raddr;
626 p->link = u->link;
627 p->i_key = u->i_key;
628 p->o_key = u->o_key;
629 p->proto = u->proto;
630
631 memcpy(p->name, u->name, sizeof(u->name));
632}
633
634static void
635vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
636{
637 u->laddr = p->laddr;
638 u->raddr = p->raddr;
639 u->link = p->link;
640 u->i_key = p->i_key;
641 u->o_key = p->o_key;
642 u->proto = p->proto;
643
644 memcpy(u->name, p->name, sizeof(u->name));
645}
646
647/**
648 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
649 * @dev: virtual device associated with tunnel
650 * @ifr: parameters passed from userspace
651 * @cmd: command to be performed
652 *
653 * Description:
654 * vti6_ioctl() is used for managing vti6 tunnels
655 * from userspace.
656 *
657 * The possible commands are the following:
658 * %SIOCGETTUNNEL: get tunnel parameters for device
659 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
660 * %SIOCCHGTUNNEL: change tunnel parameters to those given
661 * %SIOCDELTUNNEL: delete tunnel
662 *
663 * The fallback device "ip6_vti0", created during module
664 * initialization, can be used for creating other tunnel devices.
665 *
666 * Return:
667 * 0 on success,
668 * %-EFAULT if unable to copy data to or from userspace,
669 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
670 * %-EINVAL if passed tunnel parameters are invalid,
671 * %-EEXIST if changing a tunnel's parameters would cause a conflict
672 * %-ENODEV if attempting to change or delete a nonexisting device
673 **/
674static int
675vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
676{
677 int err = 0;
678 struct ip6_tnl_parm2 p;
679 struct __ip6_tnl_parm p1;
680 struct ip6_tnl *t = NULL;
681 struct net *net = dev_net(dev);
682 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
683
684 switch (cmd) {
685 case SIOCGETTUNNEL:
686 if (dev == ip6n->fb_tnl_dev) {
687 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
688 err = -EFAULT;
689 break;
690 }
691 vti6_parm_from_user(&p1, &p);
692 t = vti6_locate(net, &p1, 0);
693 } else {
694 memset(&p, 0, sizeof(p));
695 }
696 if (t == NULL)
697 t = netdev_priv(dev);
698 vti6_parm_to_user(&p, &t->parms);
699 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
700 err = -EFAULT;
701 break;
702 case SIOCADDTUNNEL:
703 case SIOCCHGTUNNEL:
704 err = -EPERM;
705 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
706 break;
707 err = -EFAULT;
708 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
709 break;
710 err = -EINVAL;
711 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
712 break;
713 vti6_parm_from_user(&p1, &p);
714 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
715 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
716 if (t != NULL) {
717 if (t->dev != dev) {
718 err = -EEXIST;
719 break;
720 }
721 } else
722 t = netdev_priv(dev);
723
724 err = vti6_update(t, &p1);
725 }
726 if (t) {
727 err = 0;
728 vti6_parm_to_user(&p, &t->parms);
729 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
730 err = -EFAULT;
731
732 } else
733 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
734 break;
735 case SIOCDELTUNNEL:
736 err = -EPERM;
737 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
738 break;
739
740 if (dev == ip6n->fb_tnl_dev) {
741 err = -EFAULT;
742 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
743 break;
744 err = -ENOENT;
745 vti6_parm_from_user(&p1, &p);
746 t = vti6_locate(net, &p1, 0);
747 if (t == NULL)
748 break;
749 err = -EPERM;
750 if (t->dev == ip6n->fb_tnl_dev)
751 break;
752 dev = t->dev;
753 }
754 err = 0;
755 unregister_netdevice(dev);
756 break;
757 default:
758 err = -EINVAL;
759 }
760 return err;
761}
762
763/**
764 * vti6_tnl_change_mtu - change mtu manually for tunnel device
765 * @dev: virtual device associated with tunnel
766 * @new_mtu: the new mtu
767 *
768 * Return:
769 * 0 on success,
770 * %-EINVAL if mtu too small
771 **/
772static int vti6_change_mtu(struct net_device *dev, int new_mtu)
773{
774 if (new_mtu < IPV6_MIN_MTU)
775 return -EINVAL;
776
777 dev->mtu = new_mtu;
778 return 0;
779}
780
781static const struct net_device_ops vti6_netdev_ops = {
782 .ndo_uninit = vti6_dev_uninit,
783 .ndo_start_xmit = vti6_tnl_xmit,
784 .ndo_do_ioctl = vti6_ioctl,
785 .ndo_change_mtu = vti6_change_mtu,
786 .ndo_get_stats64 = ip_tunnel_get_stats64,
787};
788
789/**
790 * vti6_dev_setup - setup virtual tunnel device
791 * @dev: virtual device associated with tunnel
792 *
793 * Description:
794 * Initialize function pointers and device parameters
795 **/
796static void vti6_dev_setup(struct net_device *dev)
797{
798 struct ip6_tnl *t;
799
800 dev->netdev_ops = &vti6_netdev_ops;
801 dev->destructor = vti6_dev_free;
802
803 dev->type = ARPHRD_TUNNEL6;
804 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
805 dev->mtu = ETH_DATA_LEN;
806 t = netdev_priv(dev);
807 dev->flags |= IFF_NOARP;
808 dev->addr_len = sizeof(struct in6_addr);
809 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
810}
811
812/**
813 * vti6_dev_init_gen - general initializer for all tunnel devices
814 * @dev: virtual device associated with tunnel
815 **/
816static inline int vti6_dev_init_gen(struct net_device *dev)
817{
818 struct ip6_tnl *t = netdev_priv(dev);
819
820 t->dev = dev;
821 t->net = dev_net(dev);
822 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
823 if (!dev->tstats)
824 return -ENOMEM;
825 return 0;
826}
827
828/**
829 * vti6_dev_init - initializer for all non fallback tunnel devices
830 * @dev: virtual device associated with tunnel
831 **/
832static int vti6_dev_init(struct net_device *dev)
833{
834 struct ip6_tnl *t = netdev_priv(dev);
835 int err = vti6_dev_init_gen(dev);
836
837 if (err)
838 return err;
839 vti6_link_config(t);
840 return 0;
841}
842
843/**
844 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
845 * @dev: fallback device
846 *
847 * Return: 0
848 **/
849static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
850{
851 struct ip6_tnl *t = netdev_priv(dev);
852 struct net *net = dev_net(dev);
853 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
854 int err = vti6_dev_init_gen(dev);
855
856 if (err)
857 return err;
858
859 t->parms.proto = IPPROTO_IPV6;
860 dev_hold(dev);
861
862 vti6_link_config(t);
863
864 rcu_assign_pointer(ip6n->tnls_wc[0], t);
865 return 0;
866}
867
868static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
869{
870 return 0;
871}
872
873static void vti6_netlink_parms(struct nlattr *data[],
874 struct __ip6_tnl_parm *parms)
875{
876 memset(parms, 0, sizeof(*parms));
877
878 if (!data)
879 return;
880
881 if (data[IFLA_VTI_LINK])
882 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
883
884 if (data[IFLA_VTI_LOCAL])
885 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL],
886 sizeof(struct in6_addr));
887
888 if (data[IFLA_VTI_REMOTE])
889 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE],
890 sizeof(struct in6_addr));
891
892 if (data[IFLA_VTI_IKEY])
893 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
894
895 if (data[IFLA_VTI_OKEY])
896 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
897}
898
899static int vti6_newlink(struct net *src_net, struct net_device *dev,
900 struct nlattr *tb[], struct nlattr *data[])
901{
902 struct net *net = dev_net(dev);
903 struct ip6_tnl *nt;
904
905 nt = netdev_priv(dev);
906 vti6_netlink_parms(data, &nt->parms);
907
908 nt->parms.proto = IPPROTO_IPV6;
909
910 if (vti6_locate(net, &nt->parms, 0))
911 return -EEXIST;
912
913 return vti6_tnl_create2(dev);
914}
915
916static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
917 struct nlattr *data[])
918{
919 struct ip6_tnl *t;
920 struct __ip6_tnl_parm p;
921 struct net *net = dev_net(dev);
922 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
923
924 if (dev == ip6n->fb_tnl_dev)
925 return -EINVAL;
926
927 vti6_netlink_parms(data, &p);
928
929 t = vti6_locate(net, &p, 0);
930
931 if (t) {
932 if (t->dev != dev)
933 return -EEXIST;
934 } else
935 t = netdev_priv(dev);
936
937 return vti6_update(t, &p);
938}
939
940static size_t vti6_get_size(const struct net_device *dev)
941{
942 return
943 /* IFLA_VTI_LINK */
944 nla_total_size(4) +
945 /* IFLA_VTI_LOCAL */
946 nla_total_size(sizeof(struct in6_addr)) +
947 /* IFLA_VTI_REMOTE */
948 nla_total_size(sizeof(struct in6_addr)) +
949 /* IFLA_VTI_IKEY */
950 nla_total_size(4) +
951 /* IFLA_VTI_OKEY */
952 nla_total_size(4) +
953 0;
954}
955
956static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
957{
958 struct ip6_tnl *tunnel = netdev_priv(dev);
959 struct __ip6_tnl_parm *parm = &tunnel->parms;
960
961 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
962 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr),
963 &parm->laddr) ||
964 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr),
965 &parm->raddr) ||
966 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
967 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
968 goto nla_put_failure;
969 return 0;
970
971nla_put_failure:
972 return -EMSGSIZE;
973}
974
975static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
976 [IFLA_VTI_LINK] = { .type = NLA_U32 },
977 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
978 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
979 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
980 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
981};
982
983static struct rtnl_link_ops vti6_link_ops __read_mostly = {
984 .kind = "vti6",
985 .maxtype = IFLA_VTI_MAX,
986 .policy = vti6_policy,
987 .priv_size = sizeof(struct ip6_tnl),
988 .setup = vti6_dev_setup,
989 .validate = vti6_validate,
990 .newlink = vti6_newlink,
991 .changelink = vti6_changelink,
992 .get_size = vti6_get_size,
993 .fill_info = vti6_fill_info,
994};
995
996static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
997{
998 int h;
999 struct ip6_tnl *t;
1000 LIST_HEAD(list);
1001
1002 for (h = 0; h < HASH_SIZE; h++) {
1003 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1004 while (t != NULL) {
1005 unregister_netdevice_queue(t->dev, &list);
1006 t = rtnl_dereference(t->next);
1007 }
1008 }
1009
1010 t = rtnl_dereference(ip6n->tnls_wc[0]);
1011 unregister_netdevice_queue(t->dev, &list);
1012 unregister_netdevice_many(&list);
1013}
1014
1015static int __net_init vti6_init_net(struct net *net)
1016{
1017 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1018 struct ip6_tnl *t = NULL;
1019 int err;
1020
1021 ip6n->tnls[0] = ip6n->tnls_wc;
1022 ip6n->tnls[1] = ip6n->tnls_r_l;
1023
1024 err = -ENOMEM;
1025 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1026 vti6_dev_setup);
1027
1028 if (!ip6n->fb_tnl_dev)
1029 goto err_alloc_dev;
1030 dev_net_set(ip6n->fb_tnl_dev, net);
1031
1032 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1033 if (err < 0)
1034 goto err_register;
1035
1036 err = register_netdev(ip6n->fb_tnl_dev);
1037 if (err < 0)
1038 goto err_register;
1039
1040 t = netdev_priv(ip6n->fb_tnl_dev);
1041
1042 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1043 return 0;
1044
1045err_register:
1046 vti6_dev_free(ip6n->fb_tnl_dev);
1047err_alloc_dev:
1048 return err;
1049}
1050
1051static void __net_exit vti6_exit_net(struct net *net)
1052{
1053 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1054
1055 rtnl_lock();
1056 vti6_destroy_tunnels(ip6n);
1057 rtnl_unlock();
1058}
1059
1060static struct pernet_operations vti6_net_ops = {
1061 .init = vti6_init_net,
1062 .exit = vti6_exit_net,
1063 .id = &vti6_net_id,
1064 .size = sizeof(struct vti6_net),
1065};
1066
1067static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1068 .handler = vti6_rcv,
1069 .cb_handler = vti6_rcv_cb,
1070 .err_handler = vti6_err,
1071 .priority = 100,
1072};
1073
1074static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1075 .handler = vti6_rcv,
1076 .cb_handler = vti6_rcv_cb,
1077 .err_handler = vti6_err,
1078 .priority = 100,
1079};
1080
1081static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1082 .handler = vti6_rcv,
1083 .cb_handler = vti6_rcv_cb,
1084 .err_handler = vti6_err,
1085 .priority = 100,
1086};
1087
1088/**
1089 * vti6_tunnel_init - register protocol and reserve needed resources
1090 *
1091 * Return: 0 on success
1092 **/
1093static int __init vti6_tunnel_init(void)
1094{
1095 int err;
1096
1097 err = register_pernet_device(&vti6_net_ops);
1098 if (err < 0)
1099 goto out_pernet;
1100
1101 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1102 if (err < 0) {
1103 pr_err("%s: can't register vti6 protocol\n", __func__);
1104
1105 goto out;
1106 }
1107
1108 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1109 if (err < 0) {
1110 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1111 pr_err("%s: can't register vti6 protocol\n", __func__);
1112
1113 goto out;
1114 }
1115
1116 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1117 if (err < 0) {
1118 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1119 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1120 pr_err("%s: can't register vti6 protocol\n", __func__);
1121
1122 goto out;
1123 }
1124
1125 err = rtnl_link_register(&vti6_link_ops);
1126 if (err < 0)
1127 goto rtnl_link_failed;
1128
1129 return 0;
1130
1131rtnl_link_failed:
1132 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1133 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1134 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1135out:
1136 unregister_pernet_device(&vti6_net_ops);
1137out_pernet:
1138 return err;
1139}
1140
1141/**
1142 * vti6_tunnel_cleanup - free resources and unregister protocol
1143 **/
1144static void __exit vti6_tunnel_cleanup(void)
1145{
1146 rtnl_link_unregister(&vti6_link_ops);
1147 if (xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP))
1148 pr_info("%s: can't deregister protocol\n", __func__);
1149 if (xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH))
1150 pr_info("%s: can't deregister protocol\n", __func__);
1151 if (xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP))
1152 pr_info("%s: can't deregister protocol\n", __func__);
1153
1154 unregister_pernet_device(&vti6_net_ops);
1155}
1156
1157module_init(vti6_tunnel_init);
1158module_exit(vti6_tunnel_cleanup);
1159MODULE_LICENSE("GPL");
1160MODULE_ALIAS_RTNL_LINK("vti6");
1161MODULE_ALIAS_NETDEV("ip6_vti0");
1162MODULE_AUTHOR("Steffen Klassert");
1163MODULE_DESCRIPTION("IPv6 virtual tunnel interface");