2 * IPv6 virtual tunneling interface
4 * Copyright (C) 2013 secunet Security Networks AG
7 * Steffen Klassert <steffen.klassert@secunet.com>
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>
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>
44 #include <net/ip_tunnels.h>
46 #include <net/ip6_route.h>
47 #include <net/addrconf.h>
48 #include <net/ip6_tunnel.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;
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))
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
87 * tunnel matching given end-points if found,
88 * else fallback tunnel if its device is up,
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);
97 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
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))
105 t = rcu_dereference(ip6n->tnls_wc[0]);
106 if (t && (t->dev->flags & IFF_UP))
113 * vti6_tnl_bucket - get head of list matching given tunnel parameters
114 * @p: parameters containing tunnel end-points
117 * vti6_tnl_bucket() returns the head of the list matching the
118 * &struct in6_addr entries laddr and raddr in @p.
120 * Return: head of IPv6 tunnel list
122 static struct ip6_tnl __rcu **
123 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
125 const struct in6_addr *remote = &p->raddr;
126 const struct in6_addr *local = &p->laddr;
130 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
132 h = HASH(remote, local);
134 return &ip6n->tnls[prio][h];
138 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
140 struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
142 rcu_assign_pointer(t->next , rtnl_dereference(*tp));
143 rcu_assign_pointer(*tp, t);
147 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
149 struct ip6_tnl __rcu **tp;
150 struct ip6_tnl *iter;
152 for (tp = vti6_tnl_bucket(ip6n, &t->parms);
153 (iter = rtnl_dereference(*tp)) != NULL;
156 rcu_assign_pointer(*tp, t->next);
162 static void vti6_dev_free(struct net_device *dev)
164 free_percpu(dev->tstats);
168 static int vti6_tnl_create2(struct net_device *dev)
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);
175 err = vti6_dev_init(dev);
179 err = register_netdevice(dev);
183 strcpy(t->parms.name, dev->name);
184 dev->rtnl_link_ops = &vti6_link_ops;
187 vti6_tnl_link(ip6n, t);
195 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
197 struct net_device *dev;
203 strlcpy(name, p->name, IFNAMSIZ);
205 sprintf(name, "ip6_vti%%d");
207 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
211 dev_net_set(dev, net);
213 t = netdev_priv(dev);
215 t->net = dev_net(dev);
217 err = vti6_tnl_create2(dev);
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
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.
241 * matching tunnel or NULL
243 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
246 const struct in6_addr *remote = &p->raddr;
247 const struct in6_addr *local = &p->laddr;
248 struct ip6_tnl __rcu **tp;
250 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
252 for (tp = vti6_tnl_bucket(ip6n, p);
253 (t = rtnl_dereference(*tp)) != NULL;
255 if (ipv6_addr_equal(local, &t->parms.laddr) &&
256 ipv6_addr_equal(remote, &t->parms.raddr)) {
265 return vti6_tnl_create(net, p);
269 * vti6_dev_uninit - tunnel device uninitializer
270 * @dev: the device to be destroyed
273 * vti6_dev_uninit() removes tunnel from its list
275 static void vti6_dev_uninit(struct net_device *dev)
277 struct ip6_tnl *t = netdev_priv(dev);
278 struct net *net = dev_net(dev);
279 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
281 if (dev == ip6n->fb_tnl_dev)
282 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
284 vti6_tnl_unlink(ip6n, t);
288 static int vti6_rcv(struct sk_buff *skb)
291 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
294 if ((t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr,
295 &ipv6h->daddr)) != NULL) {
296 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
301 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
306 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
307 t->dev->stats.rx_dropped++;
312 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
313 skb->mark = be32_to_cpu(t->parms.i_key);
317 return xfrm6_rcv(skb);
326 static int vti6_rcv_cb(struct sk_buff *skb, int err)
328 unsigned short family;
329 struct net_device *dev;
330 struct pcpu_sw_netstats *tstats;
331 struct xfrm_state *x;
332 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
340 dev->stats.rx_errors++;
341 dev->stats.rx_dropped++;
346 x = xfrm_input_state(skb);
347 family = x->inner_mode->afinfo->family;
349 if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family))
352 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
355 tstats = this_cpu_ptr(dev->tstats);
356 u64_stats_update_begin(&tstats->syncp);
357 tstats->rx_packets++;
358 tstats->rx_bytes += skb->len;
359 u64_stats_update_end(&tstats->syncp);
365 * vti6_addr_conflict - compare packet addresses to tunnel's own
366 * @t: the outgoing tunnel device
367 * @hdr: IPv6 header from the incoming packet
370 * Avoid trivial tunneling loop by checking that tunnel exit-point
371 * doesn't match source of incoming packet.
378 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
380 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
383 static bool vti6_state_check(const struct xfrm_state *x,
384 const struct in6_addr *dst,
385 const struct in6_addr *src)
387 xfrm_address_t *daddr = (xfrm_address_t *)dst;
388 xfrm_address_t *saddr = (xfrm_address_t *)src;
390 /* if there is no transform then this tunnel is not functional.
391 * Or if the xfrm is not mode tunnel.
393 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
394 x->props.family != AF_INET6)
397 if (ipv6_addr_any(dst))
398 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
400 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
407 * vti6_xmit - send a packet
408 * @skb: the outgoing socket buffer
409 * @dev: the outgoing tunnel device
410 * @fl: the flow informations for the xfrm_lookup
413 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
415 struct ip6_tnl *t = netdev_priv(dev);
416 struct net_device_stats *stats = &t->dev->stats;
417 struct dst_entry *dst = skb_dst(skb);
418 struct net_device *tdev;
422 goto tx_err_link_failure;
425 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
429 goto tx_err_link_failure;
432 if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr))
433 goto tx_err_link_failure;
439 net_warn_ratelimited("%s: Local routing loop detected!\n",
441 goto tx_err_dst_release;
444 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
445 skb_dst_set(skb, dst);
446 skb->dev = skb_dst(skb)->dev;
448 err = dst_output(skb);
449 if (net_xmit_eval(err) == 0) {
450 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
452 u64_stats_update_begin(&tstats->syncp);
453 tstats->tx_bytes += skb->len;
454 tstats->tx_packets++;
455 u64_stats_update_end(&tstats->syncp);
458 stats->tx_aborted_errors++;
463 stats->tx_carrier_errors++;
464 dst_link_failure(skb);
471 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
473 struct ip6_tnl *t = netdev_priv(dev);
474 struct net_device_stats *stats = &t->dev->stats;
475 struct ipv6hdr *ipv6h;
479 memset(&fl, 0, sizeof(fl));
480 skb->mark = be32_to_cpu(t->parms.o_key);
482 switch (skb->protocol) {
483 case htons(ETH_P_IPV6):
484 ipv6h = ipv6_hdr(skb);
486 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
487 !ip6_tnl_xmit_ctl(t) || vti6_addr_conflict(t, ipv6h))
490 xfrm_decode_session(skb, &fl, AF_INET6);
491 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
493 case htons(ETH_P_IP):
494 xfrm_decode_session(skb, &fl, AF_INET);
495 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
501 ret = vti6_xmit(skb, dev, &fl);
514 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
515 u8 type, u8 code, int offset, __be32 info)
519 struct xfrm_state *x;
521 struct ip_esp_hdr *esph;
522 struct ip_auth_hdr *ah;
523 struct ip_comp_hdr *ipch;
524 struct net *net = dev_net(skb->dev);
525 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
526 int protocol = iph->nexthdr;
528 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
532 mark = be32_to_cpu(t->parms.o_key);
536 esph = (struct ip_esp_hdr *)(skb->data + offset);
540 ah = (struct ip_auth_hdr *)(skb->data + offset);
544 ipch = (struct ip_comp_hdr *)(skb->data + offset);
545 spi = htonl(ntohs(ipch->cpi));
551 if (type != ICMPV6_PKT_TOOBIG &&
552 type != NDISC_REDIRECT)
555 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
556 spi, protocol, AF_INET6);
560 if (type == NDISC_REDIRECT)
561 ip6_redirect(skb, net, skb->dev->ifindex, 0);
563 ip6_update_pmtu(skb, net, info, 0, 0);
569 static void vti6_link_config(struct ip6_tnl *t)
571 struct net_device *dev = t->dev;
572 struct __ip6_tnl_parm *p = &t->parms;
574 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
575 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
577 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
578 IP6_TNL_F_CAP_PER_PACKET);
579 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
581 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
582 dev->flags |= IFF_POINTOPOINT;
584 dev->flags &= ~IFF_POINTOPOINT;
586 dev->iflink = p->link;
590 * vti6_tnl_change - update the tunnel parameters
591 * @t: tunnel to be changed
592 * @p: tunnel configuration parameters
595 * vti6_tnl_change() updates the tunnel parameters
598 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
600 t->parms.laddr = p->laddr;
601 t->parms.raddr = p->raddr;
602 t->parms.link = p->link;
603 t->parms.i_key = p->i_key;
604 t->parms.o_key = p->o_key;
605 t->parms.proto = p->proto;
606 ip6_tnl_dst_reset(t);
611 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
613 struct net *net = dev_net(t->dev);
614 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
617 vti6_tnl_unlink(ip6n, t);
619 err = vti6_tnl_change(t, p);
620 vti6_tnl_link(ip6n, t);
621 netdev_state_change(t->dev);
626 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
635 memcpy(p->name, u->name, sizeof(u->name));
639 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
648 memcpy(u->name, p->name, sizeof(u->name));
652 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
653 * @dev: virtual device associated with tunnel
654 * @ifr: parameters passed from userspace
655 * @cmd: command to be performed
658 * vti6_ioctl() is used for managing vti6 tunnels
661 * The possible commands are the following:
662 * %SIOCGETTUNNEL: get tunnel parameters for device
663 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
664 * %SIOCCHGTUNNEL: change tunnel parameters to those given
665 * %SIOCDELTUNNEL: delete tunnel
667 * The fallback device "ip6_vti0", created during module
668 * initialization, can be used for creating other tunnel devices.
672 * %-EFAULT if unable to copy data to or from userspace,
673 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
674 * %-EINVAL if passed tunnel parameters are invalid,
675 * %-EEXIST if changing a tunnel's parameters would cause a conflict
676 * %-ENODEV if attempting to change or delete a nonexisting device
679 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
682 struct ip6_tnl_parm2 p;
683 struct __ip6_tnl_parm p1;
684 struct ip6_tnl *t = NULL;
685 struct net *net = dev_net(dev);
686 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
690 if (dev == ip6n->fb_tnl_dev) {
691 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
695 vti6_parm_from_user(&p1, &p);
696 t = vti6_locate(net, &p1, 0);
698 memset(&p, 0, sizeof(p));
701 t = netdev_priv(dev);
702 vti6_parm_to_user(&p, &t->parms);
703 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
709 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
712 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
715 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
717 vti6_parm_from_user(&p1, &p);
718 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
719 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
726 t = netdev_priv(dev);
728 err = vti6_update(t, &p1);
732 vti6_parm_to_user(&p, &t->parms);
733 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
737 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
741 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
744 if (dev == ip6n->fb_tnl_dev) {
746 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
749 vti6_parm_from_user(&p1, &p);
750 t = vti6_locate(net, &p1, 0);
754 if (t->dev == ip6n->fb_tnl_dev)
759 unregister_netdevice(dev);
768 * vti6_tnl_change_mtu - change mtu manually for tunnel device
769 * @dev: virtual device associated with tunnel
770 * @new_mtu: the new mtu
774 * %-EINVAL if mtu too small
776 static int vti6_change_mtu(struct net_device *dev, int new_mtu)
778 if (new_mtu < IPV6_MIN_MTU)
785 static const struct net_device_ops vti6_netdev_ops = {
786 .ndo_uninit = vti6_dev_uninit,
787 .ndo_start_xmit = vti6_tnl_xmit,
788 .ndo_do_ioctl = vti6_ioctl,
789 .ndo_change_mtu = vti6_change_mtu,
790 .ndo_get_stats64 = ip_tunnel_get_stats64,
794 * vti6_dev_setup - setup virtual tunnel device
795 * @dev: virtual device associated with tunnel
798 * Initialize function pointers and device parameters
800 static void vti6_dev_setup(struct net_device *dev)
802 dev->netdev_ops = &vti6_netdev_ops;
803 dev->destructor = vti6_dev_free;
805 dev->type = ARPHRD_TUNNEL6;
806 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
807 dev->mtu = ETH_DATA_LEN;
808 dev->flags |= IFF_NOARP;
809 dev->addr_len = sizeof(struct in6_addr);
814 * vti6_dev_init_gen - general initializer for all tunnel devices
815 * @dev: virtual device associated with tunnel
817 static inline int vti6_dev_init_gen(struct net_device *dev)
819 struct ip6_tnl *t = netdev_priv(dev);
822 t->net = dev_net(dev);
823 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
830 * vti6_dev_init - initializer for all non fallback tunnel devices
831 * @dev: virtual device associated with tunnel
833 static int vti6_dev_init(struct net_device *dev)
835 struct ip6_tnl *t = netdev_priv(dev);
836 int err = vti6_dev_init_gen(dev);
845 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
846 * @dev: fallback device
850 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
852 struct ip6_tnl *t = netdev_priv(dev);
853 struct net *net = dev_net(dev);
854 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
855 int err = vti6_dev_init_gen(dev);
860 t->parms.proto = IPPROTO_IPV6;
865 rcu_assign_pointer(ip6n->tnls_wc[0], t);
869 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
874 static void vti6_netlink_parms(struct nlattr *data[],
875 struct __ip6_tnl_parm *parms)
877 memset(parms, 0, sizeof(*parms));
882 if (data[IFLA_VTI_LINK])
883 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
885 if (data[IFLA_VTI_LOCAL])
886 nla_memcpy(&parms->laddr, data[IFLA_VTI_LOCAL],
887 sizeof(struct in6_addr));
889 if (data[IFLA_VTI_REMOTE])
890 nla_memcpy(&parms->raddr, data[IFLA_VTI_REMOTE],
891 sizeof(struct in6_addr));
893 if (data[IFLA_VTI_IKEY])
894 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
896 if (data[IFLA_VTI_OKEY])
897 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
900 static int vti6_newlink(struct net *src_net, struct net_device *dev,
901 struct nlattr *tb[], struct nlattr *data[])
903 struct net *net = dev_net(dev);
906 nt = netdev_priv(dev);
907 vti6_netlink_parms(data, &nt->parms);
909 nt->parms.proto = IPPROTO_IPV6;
911 if (vti6_locate(net, &nt->parms, 0))
914 return vti6_tnl_create2(dev);
917 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
918 struct nlattr *data[])
921 struct __ip6_tnl_parm p;
922 struct net *net = dev_net(dev);
923 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
925 if (dev == ip6n->fb_tnl_dev)
928 vti6_netlink_parms(data, &p);
930 t = vti6_locate(net, &p, 0);
936 t = netdev_priv(dev);
938 return vti6_update(t, &p);
941 static size_t vti6_get_size(const struct net_device *dev)
947 nla_total_size(sizeof(struct in6_addr)) +
948 /* IFLA_VTI_REMOTE */
949 nla_total_size(sizeof(struct in6_addr)) +
957 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
959 struct ip6_tnl *tunnel = netdev_priv(dev);
960 struct __ip6_tnl_parm *parm = &tunnel->parms;
962 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
963 nla_put(skb, IFLA_VTI_LOCAL, sizeof(struct in6_addr),
965 nla_put(skb, IFLA_VTI_REMOTE, sizeof(struct in6_addr),
967 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
968 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
969 goto nla_put_failure;
976 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
977 [IFLA_VTI_LINK] = { .type = NLA_U32 },
978 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
979 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
980 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
981 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
984 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
986 .maxtype = IFLA_VTI_MAX,
987 .policy = vti6_policy,
988 .priv_size = sizeof(struct ip6_tnl),
989 .setup = vti6_dev_setup,
990 .validate = vti6_validate,
991 .newlink = vti6_newlink,
992 .changelink = vti6_changelink,
993 .get_size = vti6_get_size,
994 .fill_info = vti6_fill_info,
997 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1003 for (h = 0; h < HASH_SIZE; h++) {
1004 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1006 unregister_netdevice_queue(t->dev, &list);
1007 t = rtnl_dereference(t->next);
1011 t = rtnl_dereference(ip6n->tnls_wc[0]);
1012 unregister_netdevice_queue(t->dev, &list);
1013 unregister_netdevice_many(&list);
1016 static int __net_init vti6_init_net(struct net *net)
1018 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1019 struct ip6_tnl *t = NULL;
1022 ip6n->tnls[0] = ip6n->tnls_wc;
1023 ip6n->tnls[1] = ip6n->tnls_r_l;
1026 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1027 NET_NAME_UNKNOWN, vti6_dev_setup);
1029 if (!ip6n->fb_tnl_dev)
1031 dev_net_set(ip6n->fb_tnl_dev, net);
1033 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1037 err = register_netdev(ip6n->fb_tnl_dev);
1041 t = netdev_priv(ip6n->fb_tnl_dev);
1043 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1047 vti6_dev_free(ip6n->fb_tnl_dev);
1052 static void __net_exit vti6_exit_net(struct net *net)
1054 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1057 vti6_destroy_tunnels(ip6n);
1061 static struct pernet_operations vti6_net_ops = {
1062 .init = vti6_init_net,
1063 .exit = vti6_exit_net,
1065 .size = sizeof(struct vti6_net),
1068 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1069 .handler = vti6_rcv,
1070 .cb_handler = vti6_rcv_cb,
1071 .err_handler = vti6_err,
1075 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1076 .handler = vti6_rcv,
1077 .cb_handler = vti6_rcv_cb,
1078 .err_handler = vti6_err,
1082 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1083 .handler = vti6_rcv,
1084 .cb_handler = vti6_rcv_cb,
1085 .err_handler = vti6_err,
1090 * vti6_tunnel_init - register protocol and reserve needed resources
1092 * Return: 0 on success
1094 static int __init vti6_tunnel_init(void)
1099 msg = "tunnel device";
1100 err = register_pernet_device(&vti6_net_ops);
1102 goto pernet_dev_failed;
1104 msg = "tunnel protocols";
1105 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1107 goto xfrm_proto_esp_failed;
1108 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1110 goto xfrm_proto_ah_failed;
1111 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1113 goto xfrm_proto_comp_failed;
1115 msg = "netlink interface";
1116 err = rtnl_link_register(&vti6_link_ops);
1118 goto rtnl_link_failed;
1123 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1124 xfrm_proto_comp_failed:
1125 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1126 xfrm_proto_ah_failed:
1127 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1128 xfrm_proto_esp_failed:
1129 unregister_pernet_device(&vti6_net_ops);
1131 pr_err("vti6 init: failed to register %s\n", msg);
1136 * vti6_tunnel_cleanup - free resources and unregister protocol
1138 static void __exit vti6_tunnel_cleanup(void)
1140 rtnl_link_unregister(&vti6_link_ops);
1141 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1142 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1143 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1144 unregister_pernet_device(&vti6_net_ops);
1147 module_init(vti6_tunnel_init);
1148 module_exit(vti6_tunnel_cleanup);
1149 MODULE_LICENSE("GPL");
1150 MODULE_ALIAS_RTNL_LINK("vti6");
1151 MODULE_ALIAS_NETDEV("ip6_vti0");
1152 MODULE_AUTHOR("Steffen Klassert");
1153 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");