Linux 4.8-rc8
[linux/fpc-iii.git] / net / ipv6 / ip6_vti.c
blob5bd3afdcc7715e3abd83ee5f31a8d9eb9311d7fd
1 /*
2 * IPv6 virtual tunneling interface
4 * Copyright (C) 2013 secunet Security Networks AG
6 * Author:
7 * Steffen Klassert <steffen.klassert@secunet.com>
9 * Based on:
10 * net/ipv6/ip6_tunnel.c
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.
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>
39 #include <linux/uaccess.h>
40 #include <linux/atomic.h>
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>
53 #define HASH_SIZE_SHIFT 5
54 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)
56 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
58 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
60 return hash_32(hash, HASH_SIZE_SHIFT);
63 static int vti6_dev_init(struct net_device *dev);
64 static void vti6_dev_setup(struct net_device *dev);
65 static struct rtnl_link_ops vti6_link_ops __read_mostly;
67 static int vti6_net_id __read_mostly;
68 struct 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];
77 #define for_each_vti6_tunnel_rcu(start) \
78 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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
86 * Return:
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
89 * else %NULL
90 **/
91 static struct ip6_tnl *
92 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
93 const struct in6_addr *local)
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;
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;
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;
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;
122 t = rcu_dereference(ip6n->tnls_wc[0]);
123 if (t && (t->dev->flags & IFF_UP))
124 return t;
126 return NULL;
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
133 * Description:
134 * vti6_tnl_bucket() returns the head of the list matching the
135 * &struct in6_addr entries laddr and raddr in @p.
137 * Return: head of IPv6 tunnel list
139 static struct ip6_tnl __rcu **
140 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
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;
147 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
148 prio = 1;
149 h = HASH(remote, local);
151 return &ip6n->tnls[prio][h];
154 static void
155 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
157 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
159 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
160 rcu_assign_pointer(*tp, t);
163 static void
164 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
166 struct ip6_tnl __rcu **tp;
167 struct ip6_tnl *iter;
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;
179 static void vti6_dev_free(struct net_device *dev)
181 free_percpu(dev->tstats);
182 free_netdev(dev);
185 static int vti6_tnl_create2(struct net_device *dev)
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;
192 err = register_netdevice(dev);
193 if (err < 0)
194 goto out;
196 strcpy(t->parms.name, dev->name);
197 dev->rtnl_link_ops = &vti6_link_ops;
199 dev_hold(dev);
200 vti6_tnl_link(ip6n, t);
202 return 0;
204 out:
205 return err;
208 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
210 struct net_device *dev;
211 struct ip6_tnl *t;
212 char name[IFNAMSIZ];
213 int err;
215 if (p->name[0])
216 strlcpy(name, p->name, IFNAMSIZ);
217 else
218 sprintf(name, "ip6_vti%%d");
220 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
221 if (!dev)
222 goto failed;
224 dev_net_set(dev, net);
226 t = netdev_priv(dev);
227 t->parms = *p;
228 t->net = dev_net(dev);
230 err = vti6_tnl_create2(dev);
231 if (err < 0)
232 goto failed_free;
234 return t;
236 failed_free:
237 vti6_dev_free(dev);
238 failed:
239 return NULL;
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
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.
253 * Return:
254 * matching tunnel or NULL
256 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
257 int create)
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);
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;
273 return t;
276 if (!create)
277 return NULL;
278 return vti6_tnl_create(net, p);
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
285 * Description:
286 * vti6_dev_uninit() removes tunnel from its list
288 static void vti6_dev_uninit(struct net_device *dev)
290 struct ip6_tnl *t = netdev_priv(dev);
291 struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
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);
300 static int vti6_rcv(struct sk_buff *skb)
302 struct ip6_tnl *t;
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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;
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
314 rcu_read_unlock();
315 return 0;
318 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
319 t->dev->stats.rx_dropped++;
320 rcu_read_unlock();
321 goto discard;
324 rcu_read_unlock();
326 return xfrm6_rcv_tnl(skb, t);
328 rcu_read_unlock();
329 return -EINVAL;
330 discard:
331 kfree_skb(skb);
332 return 0;
335 static int vti6_rcv_cb(struct sk_buff *skb, int err)
337 unsigned short family;
338 struct net_device *dev;
339 struct pcpu_sw_netstats *tstats;
340 struct xfrm_state *x;
341 struct xfrm_mode *inner_mode;
342 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
343 u32 orig_mark = skb->mark;
344 int ret;
346 if (!t)
347 return 1;
349 dev = t->dev;
351 if (err) {
352 dev->stats.rx_errors++;
353 dev->stats.rx_dropped++;
355 return 0;
358 x = xfrm_input_state(skb);
360 inner_mode = x->inner_mode;
362 if (x->sel.family == AF_UNSPEC) {
363 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
364 if (inner_mode == NULL) {
365 XFRM_INC_STATS(dev_net(skb->dev),
366 LINUX_MIB_XFRMINSTATEMODEERROR);
367 return -EINVAL;
371 family = inner_mode->afinfo->family;
373 skb->mark = be32_to_cpu(t->parms.i_key);
374 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
375 skb->mark = orig_mark;
377 if (!ret)
378 return -EPERM;
380 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
381 skb->dev = dev;
383 tstats = this_cpu_ptr(dev->tstats);
384 u64_stats_update_begin(&tstats->syncp);
385 tstats->rx_packets++;
386 tstats->rx_bytes += skb->len;
387 u64_stats_update_end(&tstats->syncp);
389 return 0;
393 * vti6_addr_conflict - compare packet addresses to tunnel's own
394 * @t: the outgoing tunnel device
395 * @hdr: IPv6 header from the incoming packet
397 * Description:
398 * Avoid trivial tunneling loop by checking that tunnel exit-point
399 * doesn't match source of incoming packet.
401 * Return:
402 * 1 if conflict,
403 * 0 else
405 static inline bool
406 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
408 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
411 static bool vti6_state_check(const struct xfrm_state *x,
412 const struct in6_addr *dst,
413 const struct in6_addr *src)
415 xfrm_address_t *daddr = (xfrm_address_t *)dst;
416 xfrm_address_t *saddr = (xfrm_address_t *)src;
418 /* if there is no transform then this tunnel is not functional.
419 * Or if the xfrm is not mode tunnel.
421 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
422 x->props.family != AF_INET6)
423 return false;
425 if (ipv6_addr_any(dst))
426 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
428 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
429 return false;
431 return true;
435 * vti6_xmit - send a packet
436 * @skb: the outgoing socket buffer
437 * @dev: the outgoing tunnel device
438 * @fl: the flow informations for the xfrm_lookup
440 static int
441 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
443 struct ip6_tnl *t = netdev_priv(dev);
444 struct net_device_stats *stats = &t->dev->stats;
445 struct dst_entry *dst = skb_dst(skb);
446 struct net_device *tdev;
447 struct xfrm_state *x;
448 int err = -1;
449 int mtu;
451 if (!dst)
452 goto tx_err_link_failure;
454 dst_hold(dst);
455 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
456 if (IS_ERR(dst)) {
457 err = PTR_ERR(dst);
458 dst = NULL;
459 goto tx_err_link_failure;
462 x = dst->xfrm;
463 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
464 goto tx_err_link_failure;
466 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
467 (const struct in6_addr *)&x->id.daddr))
468 goto tx_err_link_failure;
470 tdev = dst->dev;
472 if (tdev == dev) {
473 stats->collisions++;
474 net_warn_ratelimited("%s: Local routing loop detected!\n",
475 t->parms.name);
476 goto tx_err_dst_release;
479 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
480 skb_dst_set(skb, dst);
481 skb->dev = skb_dst(skb)->dev;
483 mtu = dst_mtu(dst);
484 if (!skb->ignore_df && skb->len > mtu) {
485 skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu);
487 if (skb->protocol == htons(ETH_P_IPV6))
488 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
489 else
490 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
491 htonl(mtu));
493 return -EMSGSIZE;
496 err = dst_output(t->net, skb->sk, skb);
497 if (net_xmit_eval(err) == 0) {
498 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
500 u64_stats_update_begin(&tstats->syncp);
501 tstats->tx_bytes += skb->len;
502 tstats->tx_packets++;
503 u64_stats_update_end(&tstats->syncp);
504 } else {
505 stats->tx_errors++;
506 stats->tx_aborted_errors++;
509 return 0;
510 tx_err_link_failure:
511 stats->tx_carrier_errors++;
512 dst_link_failure(skb);
513 tx_err_dst_release:
514 dst_release(dst);
515 return err;
518 static netdev_tx_t
519 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
521 struct ip6_tnl *t = netdev_priv(dev);
522 struct net_device_stats *stats = &t->dev->stats;
523 struct ipv6hdr *ipv6h;
524 struct flowi fl;
525 int ret;
527 memset(&fl, 0, sizeof(fl));
529 switch (skb->protocol) {
530 case htons(ETH_P_IPV6):
531 ipv6h = ipv6_hdr(skb);
533 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
534 vti6_addr_conflict(t, ipv6h))
535 goto tx_err;
537 xfrm_decode_session(skb, &fl, AF_INET6);
538 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
539 break;
540 case htons(ETH_P_IP):
541 xfrm_decode_session(skb, &fl, AF_INET);
542 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
543 break;
544 default:
545 goto tx_err;
548 /* override mark with tunnel output key */
549 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
551 ret = vti6_xmit(skb, dev, &fl);
552 if (ret < 0)
553 goto tx_err;
555 return NETDEV_TX_OK;
557 tx_err:
558 stats->tx_errors++;
559 stats->tx_dropped++;
560 kfree_skb(skb);
561 return NETDEV_TX_OK;
564 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
565 u8 type, u8 code, int offset, __be32 info)
567 __be32 spi;
568 __u32 mark;
569 struct xfrm_state *x;
570 struct ip6_tnl *t;
571 struct ip_esp_hdr *esph;
572 struct ip_auth_hdr *ah;
573 struct ip_comp_hdr *ipch;
574 struct net *net = dev_net(skb->dev);
575 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
576 int protocol = iph->nexthdr;
578 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
579 if (!t)
580 return -1;
582 mark = be32_to_cpu(t->parms.o_key);
584 switch (protocol) {
585 case IPPROTO_ESP:
586 esph = (struct ip_esp_hdr *)(skb->data + offset);
587 spi = esph->spi;
588 break;
589 case IPPROTO_AH:
590 ah = (struct ip_auth_hdr *)(skb->data + offset);
591 spi = ah->spi;
592 break;
593 case IPPROTO_COMP:
594 ipch = (struct ip_comp_hdr *)(skb->data + offset);
595 spi = htonl(ntohs(ipch->cpi));
596 break;
597 default:
598 return 0;
601 if (type != ICMPV6_PKT_TOOBIG &&
602 type != NDISC_REDIRECT)
603 return 0;
605 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
606 spi, protocol, AF_INET6);
607 if (!x)
608 return 0;
610 if (type == NDISC_REDIRECT)
611 ip6_redirect(skb, net, skb->dev->ifindex, 0);
612 else
613 ip6_update_pmtu(skb, net, info, 0, 0);
614 xfrm_state_put(x);
616 return 0;
619 static void vti6_link_config(struct ip6_tnl *t)
621 struct net_device *dev = t->dev;
622 struct __ip6_tnl_parm *p = &t->parms;
624 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
625 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
627 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
628 IP6_TNL_F_CAP_PER_PACKET);
629 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
631 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
632 dev->flags |= IFF_POINTOPOINT;
633 else
634 dev->flags &= ~IFF_POINTOPOINT;
638 * vti6_tnl_change - update the tunnel parameters
639 * @t: tunnel to be changed
640 * @p: tunnel configuration parameters
642 * Description:
643 * vti6_tnl_change() updates the tunnel parameters
645 static int
646 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
648 t->parms.laddr = p->laddr;
649 t->parms.raddr = p->raddr;
650 t->parms.link = p->link;
651 t->parms.i_key = p->i_key;
652 t->parms.o_key = p->o_key;
653 t->parms.proto = p->proto;
654 dst_cache_reset(&t->dst_cache);
655 vti6_link_config(t);
656 return 0;
659 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
661 struct net *net = dev_net(t->dev);
662 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
663 int err;
665 vti6_tnl_unlink(ip6n, t);
666 synchronize_net();
667 err = vti6_tnl_change(t, p);
668 vti6_tnl_link(ip6n, t);
669 netdev_state_change(t->dev);
670 return err;
673 static void
674 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
676 p->laddr = u->laddr;
677 p->raddr = u->raddr;
678 p->link = u->link;
679 p->i_key = u->i_key;
680 p->o_key = u->o_key;
681 p->proto = u->proto;
683 memcpy(p->name, u->name, sizeof(u->name));
686 static void
687 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
689 u->laddr = p->laddr;
690 u->raddr = p->raddr;
691 u->link = p->link;
692 u->i_key = p->i_key;
693 u->o_key = p->o_key;
694 u->proto = p->proto;
696 memcpy(u->name, p->name, sizeof(u->name));
700 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
701 * @dev: virtual device associated with tunnel
702 * @ifr: parameters passed from userspace
703 * @cmd: command to be performed
705 * Description:
706 * vti6_ioctl() is used for managing vti6 tunnels
707 * from userspace.
709 * The possible commands are the following:
710 * %SIOCGETTUNNEL: get tunnel parameters for device
711 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
712 * %SIOCCHGTUNNEL: change tunnel parameters to those given
713 * %SIOCDELTUNNEL: delete tunnel
715 * The fallback device "ip6_vti0", created during module
716 * initialization, can be used for creating other tunnel devices.
718 * Return:
719 * 0 on success,
720 * %-EFAULT if unable to copy data to or from userspace,
721 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
722 * %-EINVAL if passed tunnel parameters are invalid,
723 * %-EEXIST if changing a tunnel's parameters would cause a conflict
724 * %-ENODEV if attempting to change or delete a nonexisting device
726 static int
727 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
729 int err = 0;
730 struct ip6_tnl_parm2 p;
731 struct __ip6_tnl_parm p1;
732 struct ip6_tnl *t = NULL;
733 struct net *net = dev_net(dev);
734 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
736 switch (cmd) {
737 case SIOCGETTUNNEL:
738 if (dev == ip6n->fb_tnl_dev) {
739 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
740 err = -EFAULT;
741 break;
743 vti6_parm_from_user(&p1, &p);
744 t = vti6_locate(net, &p1, 0);
745 } else {
746 memset(&p, 0, sizeof(p));
748 if (!t)
749 t = netdev_priv(dev);
750 vti6_parm_to_user(&p, &t->parms);
751 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
752 err = -EFAULT;
753 break;
754 case SIOCADDTUNNEL:
755 case SIOCCHGTUNNEL:
756 err = -EPERM;
757 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
758 break;
759 err = -EFAULT;
760 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
761 break;
762 err = -EINVAL;
763 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
764 break;
765 vti6_parm_from_user(&p1, &p);
766 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
767 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
768 if (t) {
769 if (t->dev != dev) {
770 err = -EEXIST;
771 break;
773 } else
774 t = netdev_priv(dev);
776 err = vti6_update(t, &p1);
778 if (t) {
779 err = 0;
780 vti6_parm_to_user(&p, &t->parms);
781 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
782 err = -EFAULT;
784 } else
785 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
786 break;
787 case SIOCDELTUNNEL:
788 err = -EPERM;
789 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
790 break;
792 if (dev == ip6n->fb_tnl_dev) {
793 err = -EFAULT;
794 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
795 break;
796 err = -ENOENT;
797 vti6_parm_from_user(&p1, &p);
798 t = vti6_locate(net, &p1, 0);
799 if (!t)
800 break;
801 err = -EPERM;
802 if (t->dev == ip6n->fb_tnl_dev)
803 break;
804 dev = t->dev;
806 err = 0;
807 unregister_netdevice(dev);
808 break;
809 default:
810 err = -EINVAL;
812 return err;
816 * vti6_tnl_change_mtu - change mtu manually for tunnel device
817 * @dev: virtual device associated with tunnel
818 * @new_mtu: the new mtu
820 * Return:
821 * 0 on success,
822 * %-EINVAL if mtu too small
824 static int vti6_change_mtu(struct net_device *dev, int new_mtu)
826 if (new_mtu < IPV6_MIN_MTU)
827 return -EINVAL;
829 dev->mtu = new_mtu;
830 return 0;
833 static const struct net_device_ops vti6_netdev_ops = {
834 .ndo_init = vti6_dev_init,
835 .ndo_uninit = vti6_dev_uninit,
836 .ndo_start_xmit = vti6_tnl_xmit,
837 .ndo_do_ioctl = vti6_ioctl,
838 .ndo_change_mtu = vti6_change_mtu,
839 .ndo_get_stats64 = ip_tunnel_get_stats64,
840 .ndo_get_iflink = ip6_tnl_get_iflink,
844 * vti6_dev_setup - setup virtual tunnel device
845 * @dev: virtual device associated with tunnel
847 * Description:
848 * Initialize function pointers and device parameters
850 static void vti6_dev_setup(struct net_device *dev)
852 dev->netdev_ops = &vti6_netdev_ops;
853 dev->destructor = vti6_dev_free;
855 dev->type = ARPHRD_TUNNEL6;
856 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
857 dev->mtu = ETH_DATA_LEN;
858 dev->flags |= IFF_NOARP;
859 dev->addr_len = sizeof(struct in6_addr);
860 netif_keep_dst(dev);
864 * vti6_dev_init_gen - general initializer for all tunnel devices
865 * @dev: virtual device associated with tunnel
867 static inline int vti6_dev_init_gen(struct net_device *dev)
869 struct ip6_tnl *t = netdev_priv(dev);
871 t->dev = dev;
872 t->net = dev_net(dev);
873 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
874 if (!dev->tstats)
875 return -ENOMEM;
876 return 0;
880 * vti6_dev_init - initializer for all non fallback tunnel devices
881 * @dev: virtual device associated with tunnel
883 static int vti6_dev_init(struct net_device *dev)
885 struct ip6_tnl *t = netdev_priv(dev);
886 int err = vti6_dev_init_gen(dev);
888 if (err)
889 return err;
890 vti6_link_config(t);
891 return 0;
895 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
896 * @dev: fallback device
898 * Return: 0
900 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
902 struct ip6_tnl *t = netdev_priv(dev);
903 struct net *net = dev_net(dev);
904 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
906 t->parms.proto = IPPROTO_IPV6;
907 dev_hold(dev);
909 rcu_assign_pointer(ip6n->tnls_wc[0], t);
910 return 0;
913 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
915 return 0;
918 static void vti6_netlink_parms(struct nlattr *data[],
919 struct __ip6_tnl_parm *parms)
921 memset(parms, 0, sizeof(*parms));
923 if (!data)
924 return;
926 if (data[IFLA_VTI_LINK])
927 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
929 if (data[IFLA_VTI_LOCAL])
930 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
932 if (data[IFLA_VTI_REMOTE])
933 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
935 if (data[IFLA_VTI_IKEY])
936 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
938 if (data[IFLA_VTI_OKEY])
939 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
942 static int vti6_newlink(struct net *src_net, struct net_device *dev,
943 struct nlattr *tb[], struct nlattr *data[])
945 struct net *net = dev_net(dev);
946 struct ip6_tnl *nt;
948 nt = netdev_priv(dev);
949 vti6_netlink_parms(data, &nt->parms);
951 nt->parms.proto = IPPROTO_IPV6;
953 if (vti6_locate(net, &nt->parms, 0))
954 return -EEXIST;
956 return vti6_tnl_create2(dev);
959 static void vti6_dellink(struct net_device *dev, struct list_head *head)
961 struct net *net = dev_net(dev);
962 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
964 if (dev != ip6n->fb_tnl_dev)
965 unregister_netdevice_queue(dev, head);
968 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
969 struct nlattr *data[])
971 struct ip6_tnl *t;
972 struct __ip6_tnl_parm p;
973 struct net *net = dev_net(dev);
974 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
976 if (dev == ip6n->fb_tnl_dev)
977 return -EINVAL;
979 vti6_netlink_parms(data, &p);
981 t = vti6_locate(net, &p, 0);
983 if (t) {
984 if (t->dev != dev)
985 return -EEXIST;
986 } else
987 t = netdev_priv(dev);
989 return vti6_update(t, &p);
992 static size_t vti6_get_size(const struct net_device *dev)
994 return
995 /* IFLA_VTI_LINK */
996 nla_total_size(4) +
997 /* IFLA_VTI_LOCAL */
998 nla_total_size(sizeof(struct in6_addr)) +
999 /* IFLA_VTI_REMOTE */
1000 nla_total_size(sizeof(struct in6_addr)) +
1001 /* IFLA_VTI_IKEY */
1002 nla_total_size(4) +
1003 /* IFLA_VTI_OKEY */
1004 nla_total_size(4) +
1008 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1010 struct ip6_tnl *tunnel = netdev_priv(dev);
1011 struct __ip6_tnl_parm *parm = &tunnel->parms;
1013 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1014 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1015 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1016 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1017 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
1018 goto nla_put_failure;
1019 return 0;
1021 nla_put_failure:
1022 return -EMSGSIZE;
1025 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1026 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1027 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1028 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1029 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1030 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1033 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1034 .kind = "vti6",
1035 .maxtype = IFLA_VTI_MAX,
1036 .policy = vti6_policy,
1037 .priv_size = sizeof(struct ip6_tnl),
1038 .setup = vti6_dev_setup,
1039 .validate = vti6_validate,
1040 .newlink = vti6_newlink,
1041 .dellink = vti6_dellink,
1042 .changelink = vti6_changelink,
1043 .get_size = vti6_get_size,
1044 .fill_info = vti6_fill_info,
1045 .get_link_net = ip6_tnl_get_link_net,
1048 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1050 int h;
1051 struct ip6_tnl *t;
1052 LIST_HEAD(list);
1054 for (h = 0; h < HASH_SIZE; h++) {
1055 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1056 while (t) {
1057 unregister_netdevice_queue(t->dev, &list);
1058 t = rtnl_dereference(t->next);
1062 t = rtnl_dereference(ip6n->tnls_wc[0]);
1063 unregister_netdevice_queue(t->dev, &list);
1064 unregister_netdevice_many(&list);
1067 static int __net_init vti6_init_net(struct net *net)
1069 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1070 struct ip6_tnl *t = NULL;
1071 int err;
1073 ip6n->tnls[0] = ip6n->tnls_wc;
1074 ip6n->tnls[1] = ip6n->tnls_r_l;
1076 err = -ENOMEM;
1077 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1078 NET_NAME_UNKNOWN, vti6_dev_setup);
1080 if (!ip6n->fb_tnl_dev)
1081 goto err_alloc_dev;
1082 dev_net_set(ip6n->fb_tnl_dev, net);
1083 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1085 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1086 if (err < 0)
1087 goto err_register;
1089 err = register_netdev(ip6n->fb_tnl_dev);
1090 if (err < 0)
1091 goto err_register;
1093 t = netdev_priv(ip6n->fb_tnl_dev);
1095 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1096 return 0;
1098 err_register:
1099 vti6_dev_free(ip6n->fb_tnl_dev);
1100 err_alloc_dev:
1101 return err;
1104 static void __net_exit vti6_exit_net(struct net *net)
1106 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1108 rtnl_lock();
1109 vti6_destroy_tunnels(ip6n);
1110 rtnl_unlock();
1113 static struct pernet_operations vti6_net_ops = {
1114 .init = vti6_init_net,
1115 .exit = vti6_exit_net,
1116 .id = &vti6_net_id,
1117 .size = sizeof(struct vti6_net),
1120 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1121 .handler = vti6_rcv,
1122 .cb_handler = vti6_rcv_cb,
1123 .err_handler = vti6_err,
1124 .priority = 100,
1127 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1128 .handler = vti6_rcv,
1129 .cb_handler = vti6_rcv_cb,
1130 .err_handler = vti6_err,
1131 .priority = 100,
1134 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1135 .handler = vti6_rcv,
1136 .cb_handler = vti6_rcv_cb,
1137 .err_handler = vti6_err,
1138 .priority = 100,
1142 * vti6_tunnel_init - register protocol and reserve needed resources
1144 * Return: 0 on success
1146 static int __init vti6_tunnel_init(void)
1148 const char *msg;
1149 int err;
1151 msg = "tunnel device";
1152 err = register_pernet_device(&vti6_net_ops);
1153 if (err < 0)
1154 goto pernet_dev_failed;
1156 msg = "tunnel protocols";
1157 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1158 if (err < 0)
1159 goto xfrm_proto_esp_failed;
1160 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1161 if (err < 0)
1162 goto xfrm_proto_ah_failed;
1163 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1164 if (err < 0)
1165 goto xfrm_proto_comp_failed;
1167 msg = "netlink interface";
1168 err = rtnl_link_register(&vti6_link_ops);
1169 if (err < 0)
1170 goto rtnl_link_failed;
1172 return 0;
1174 rtnl_link_failed:
1175 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1176 xfrm_proto_comp_failed:
1177 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1178 xfrm_proto_ah_failed:
1179 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1180 xfrm_proto_esp_failed:
1181 unregister_pernet_device(&vti6_net_ops);
1182 pernet_dev_failed:
1183 pr_err("vti6 init: failed to register %s\n", msg);
1184 return err;
1188 * vti6_tunnel_cleanup - free resources and unregister protocol
1190 static void __exit vti6_tunnel_cleanup(void)
1192 rtnl_link_unregister(&vti6_link_ops);
1193 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1194 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1195 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1196 unregister_pernet_device(&vti6_net_ops);
1199 module_init(vti6_tunnel_init);
1200 module_exit(vti6_tunnel_cleanup);
1201 MODULE_LICENSE("GPL");
1202 MODULE_ALIAS_RTNL_LINK("vti6");
1203 MODULE_ALIAS_NETDEV("ip6_vti0");
1204 MODULE_AUTHOR("Steffen Klassert");
1205 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");