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);
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))
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))
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))
122 t = rcu_dereference(ip6n->tnls_wc[0]);
123 if (t && (t->dev->flags & IFF_UP))
130 * vti6_tnl_bucket - get head of list matching given tunnel parameters
131 * @p: parameters containing tunnel end-points
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;
147 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
149 h = HASH(remote, local);
151 return &ip6n->tnls[prio][h];
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);
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;
173 rcu_assign_pointer(*tp, t->next);
179 static void vti6_dev_free(struct net_device *dev)
181 free_percpu(dev->tstats);
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);
192 err = register_netdevice(dev);
196 strcpy(t->parms.name, dev->name);
197 dev->rtnl_link_ops = &vti6_link_ops;
200 vti6_tnl_link(ip6n, t);
208 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
210 struct net_device *dev;
216 strlcpy(name, p->name, IFNAMSIZ);
218 sprintf(name, "ip6_vti%%d");
220 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
224 dev_net_set(dev, net);
226 t = netdev_priv(dev);
228 t->net = dev_net(dev);
230 err = vti6_tnl_create2(dev);
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
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.
254 * matching tunnel or NULL
256 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
259 const struct in6_addr *remote = &p->raddr;
260 const struct in6_addr *local = &p->laddr;
261 struct ip6_tnl __rcu **tp;
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;
268 if (ipv6_addr_equal(local, &t->parms.laddr) &&
269 ipv6_addr_equal(remote, &t->parms.raddr)) {
278 return vti6_tnl_create(net, p);
282 * vti6_dev_uninit - tunnel device uninitializer
283 * @dev: the device to be destroyed
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);
296 vti6_tnl_unlink(ip6n, t);
300 static int vti6_rcv(struct sk_buff *skb)
303 const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
306 t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
308 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
313 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
318 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
319 t->dev->stats.rx_dropped++;
324 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;
328 return xfrm6_rcv(skb);
337 static int vti6_rcv_cb(struct sk_buff *skb, int err)
339 unsigned short family;
340 struct net_device *dev;
341 struct pcpu_sw_netstats *tstats;
342 struct xfrm_state *x;
343 struct xfrm_mode *inner_mode;
344 struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
345 u32 orig_mark = skb->mark;
354 dev->stats.rx_errors++;
355 dev->stats.rx_dropped++;
360 x = xfrm_input_state(skb);
362 inner_mode = x->inner_mode;
364 if (x->sel.family == AF_UNSPEC) {
365 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
366 if (inner_mode == NULL) {
367 XFRM_INC_STATS(dev_net(skb->dev),
368 LINUX_MIB_XFRMINSTATEMODEERROR);
373 family = inner_mode->afinfo->family;
375 skb->mark = be32_to_cpu(t->parms.i_key);
376 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
377 skb->mark = orig_mark;
382 skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
385 tstats = this_cpu_ptr(dev->tstats);
386 u64_stats_update_begin(&tstats->syncp);
387 tstats->rx_packets++;
388 tstats->rx_bytes += skb->len;
389 u64_stats_update_end(&tstats->syncp);
395 * vti6_addr_conflict - compare packet addresses to tunnel's own
396 * @t: the outgoing tunnel device
397 * @hdr: IPv6 header from the incoming packet
400 * Avoid trivial tunneling loop by checking that tunnel exit-point
401 * doesn't match source of incoming packet.
408 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
410 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
413 static bool vti6_state_check(const struct xfrm_state *x,
414 const struct in6_addr *dst,
415 const struct in6_addr *src)
417 xfrm_address_t *daddr = (xfrm_address_t *)dst;
418 xfrm_address_t *saddr = (xfrm_address_t *)src;
420 /* if there is no transform then this tunnel is not functional.
421 * Or if the xfrm is not mode tunnel.
423 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
424 x->props.family != AF_INET6)
427 if (ipv6_addr_any(dst))
428 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
430 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
437 * vti6_xmit - send a packet
438 * @skb: the outgoing socket buffer
439 * @dev: the outgoing tunnel device
440 * @fl: the flow informations for the xfrm_lookup
443 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
445 struct ip6_tnl *t = netdev_priv(dev);
446 struct net_device_stats *stats = &t->dev->stats;
447 struct dst_entry *dst = skb_dst(skb);
448 struct net_device *tdev;
449 struct xfrm_state *x;
454 goto tx_err_link_failure;
457 dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
461 goto tx_err_link_failure;
465 if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
466 goto tx_err_link_failure;
468 if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
469 (const struct in6_addr *)&x->id.daddr))
470 goto tx_err_link_failure;
476 net_warn_ratelimited("%s: Local routing loop detected!\n",
478 goto tx_err_dst_release;
481 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
482 skb_dst_set(skb, dst);
483 skb->dev = skb_dst(skb)->dev;
486 if (!skb->ignore_df && skb->len > mtu) {
487 skb_dst(skb)->ops->update_pmtu(dst, NULL, skb, mtu);
489 if (skb->protocol == htons(ETH_P_IPV6))
490 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
492 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
498 err = dst_output(t->net, skb->sk, skb);
499 if (net_xmit_eval(err) == 0) {
500 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
502 u64_stats_update_begin(&tstats->syncp);
503 tstats->tx_bytes += skb->len;
504 tstats->tx_packets++;
505 u64_stats_update_end(&tstats->syncp);
508 stats->tx_aborted_errors++;
513 stats->tx_carrier_errors++;
514 dst_link_failure(skb);
521 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
523 struct ip6_tnl *t = netdev_priv(dev);
524 struct net_device_stats *stats = &t->dev->stats;
525 struct ipv6hdr *ipv6h;
529 memset(&fl, 0, sizeof(fl));
531 switch (skb->protocol) {
532 case htons(ETH_P_IPV6):
533 ipv6h = ipv6_hdr(skb);
535 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
536 vti6_addr_conflict(t, ipv6h))
539 xfrm_decode_session(skb, &fl, AF_INET6);
540 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
542 case htons(ETH_P_IP):
543 xfrm_decode_session(skb, &fl, AF_INET);
544 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
550 /* override mark with tunnel output key */
551 fl.flowi_mark = be32_to_cpu(t->parms.o_key);
553 ret = vti6_xmit(skb, dev, &fl);
566 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
567 u8 type, u8 code, int offset, __be32 info)
571 struct xfrm_state *x;
573 struct ip_esp_hdr *esph;
574 struct ip_auth_hdr *ah;
575 struct ip_comp_hdr *ipch;
576 struct net *net = dev_net(skb->dev);
577 const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
578 int protocol = iph->nexthdr;
580 t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
584 mark = be32_to_cpu(t->parms.o_key);
588 esph = (struct ip_esp_hdr *)(skb->data + offset);
592 ah = (struct ip_auth_hdr *)(skb->data + offset);
596 ipch = (struct ip_comp_hdr *)(skb->data + offset);
597 spi = htonl(ntohs(ipch->cpi));
603 if (type != ICMPV6_PKT_TOOBIG &&
604 type != NDISC_REDIRECT)
607 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
608 spi, protocol, AF_INET6);
612 if (type == NDISC_REDIRECT)
613 ip6_redirect(skb, net, skb->dev->ifindex, 0);
615 ip6_update_pmtu(skb, net, info, 0, 0);
621 static void vti6_link_config(struct ip6_tnl *t)
623 struct net_device *dev = t->dev;
624 struct __ip6_tnl_parm *p = &t->parms;
626 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
627 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
629 p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
630 IP6_TNL_F_CAP_PER_PACKET);
631 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
633 if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
634 dev->flags |= IFF_POINTOPOINT;
636 dev->flags &= ~IFF_POINTOPOINT;
640 * vti6_tnl_change - update the tunnel parameters
641 * @t: tunnel to be changed
642 * @p: tunnel configuration parameters
645 * vti6_tnl_change() updates the tunnel parameters
648 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
650 t->parms.laddr = p->laddr;
651 t->parms.raddr = p->raddr;
652 t->parms.link = p->link;
653 t->parms.i_key = p->i_key;
654 t->parms.o_key = p->o_key;
655 t->parms.proto = p->proto;
656 dst_cache_reset(&t->dst_cache);
661 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
663 struct net *net = dev_net(t->dev);
664 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
667 vti6_tnl_unlink(ip6n, t);
669 err = vti6_tnl_change(t, p);
670 vti6_tnl_link(ip6n, t);
671 netdev_state_change(t->dev);
676 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
685 memcpy(p->name, u->name, sizeof(u->name));
689 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
698 memcpy(u->name, p->name, sizeof(u->name));
702 * vti6_tnl_ioctl - configure vti6 tunnels from userspace
703 * @dev: virtual device associated with tunnel
704 * @ifr: parameters passed from userspace
705 * @cmd: command to be performed
708 * vti6_ioctl() is used for managing vti6 tunnels
711 * The possible commands are the following:
712 * %SIOCGETTUNNEL: get tunnel parameters for device
713 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
714 * %SIOCCHGTUNNEL: change tunnel parameters to those given
715 * %SIOCDELTUNNEL: delete tunnel
717 * The fallback device "ip6_vti0", created during module
718 * initialization, can be used for creating other tunnel devices.
722 * %-EFAULT if unable to copy data to or from userspace,
723 * %-EPERM if current process hasn't %CAP_NET_ADMIN set
724 * %-EINVAL if passed tunnel parameters are invalid,
725 * %-EEXIST if changing a tunnel's parameters would cause a conflict
726 * %-ENODEV if attempting to change or delete a nonexisting device
729 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
732 struct ip6_tnl_parm2 p;
733 struct __ip6_tnl_parm p1;
734 struct ip6_tnl *t = NULL;
735 struct net *net = dev_net(dev);
736 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
740 if (dev == ip6n->fb_tnl_dev) {
741 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
745 vti6_parm_from_user(&p1, &p);
746 t = vti6_locate(net, &p1, 0);
748 memset(&p, 0, sizeof(p));
751 t = netdev_priv(dev);
752 vti6_parm_to_user(&p, &t->parms);
753 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
759 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
762 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
765 if (p.proto != IPPROTO_IPV6 && p.proto != 0)
767 vti6_parm_from_user(&p1, &p);
768 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
769 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
776 t = netdev_priv(dev);
778 err = vti6_update(t, &p1);
782 vti6_parm_to_user(&p, &t->parms);
783 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
787 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
791 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
794 if (dev == ip6n->fb_tnl_dev) {
796 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
799 vti6_parm_from_user(&p1, &p);
800 t = vti6_locate(net, &p1, 0);
804 if (t->dev == ip6n->fb_tnl_dev)
809 unregister_netdevice(dev);
818 * vti6_tnl_change_mtu - change mtu manually for tunnel device
819 * @dev: virtual device associated with tunnel
820 * @new_mtu: the new mtu
824 * %-EINVAL if mtu too small
826 static int vti6_change_mtu(struct net_device *dev, int new_mtu)
828 if (new_mtu < IPV6_MIN_MTU)
835 static const struct net_device_ops vti6_netdev_ops = {
836 .ndo_init = vti6_dev_init,
837 .ndo_uninit = vti6_dev_uninit,
838 .ndo_start_xmit = vti6_tnl_xmit,
839 .ndo_do_ioctl = vti6_ioctl,
840 .ndo_change_mtu = vti6_change_mtu,
841 .ndo_get_stats64 = ip_tunnel_get_stats64,
842 .ndo_get_iflink = ip6_tnl_get_iflink,
846 * vti6_dev_setup - setup virtual tunnel device
847 * @dev: virtual device associated with tunnel
850 * Initialize function pointers and device parameters
852 static void vti6_dev_setup(struct net_device *dev)
854 dev->netdev_ops = &vti6_netdev_ops;
855 dev->destructor = vti6_dev_free;
857 dev->type = ARPHRD_TUNNEL6;
858 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
859 dev->mtu = ETH_DATA_LEN;
860 dev->flags |= IFF_NOARP;
861 dev->addr_len = sizeof(struct in6_addr);
866 * vti6_dev_init_gen - general initializer for all tunnel devices
867 * @dev: virtual device associated with tunnel
869 static inline int vti6_dev_init_gen(struct net_device *dev)
871 struct ip6_tnl *t = netdev_priv(dev);
874 t->net = dev_net(dev);
875 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
882 * vti6_dev_init - initializer for all non fallback tunnel devices
883 * @dev: virtual device associated with tunnel
885 static int vti6_dev_init(struct net_device *dev)
887 struct ip6_tnl *t = netdev_priv(dev);
888 int err = vti6_dev_init_gen(dev);
897 * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
898 * @dev: fallback device
902 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
904 struct ip6_tnl *t = netdev_priv(dev);
905 struct net *net = dev_net(dev);
906 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
908 t->parms.proto = IPPROTO_IPV6;
911 rcu_assign_pointer(ip6n->tnls_wc[0], t);
915 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[])
920 static void vti6_netlink_parms(struct nlattr *data[],
921 struct __ip6_tnl_parm *parms)
923 memset(parms, 0, sizeof(*parms));
928 if (data[IFLA_VTI_LINK])
929 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
931 if (data[IFLA_VTI_LOCAL])
932 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
934 if (data[IFLA_VTI_REMOTE])
935 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
937 if (data[IFLA_VTI_IKEY])
938 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
940 if (data[IFLA_VTI_OKEY])
941 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
944 static int vti6_newlink(struct net *src_net, struct net_device *dev,
945 struct nlattr *tb[], struct nlattr *data[])
947 struct net *net = dev_net(dev);
950 nt = netdev_priv(dev);
951 vti6_netlink_parms(data, &nt->parms);
953 nt->parms.proto = IPPROTO_IPV6;
955 if (vti6_locate(net, &nt->parms, 0))
958 return vti6_tnl_create2(dev);
961 static void vti6_dellink(struct net_device *dev, struct list_head *head)
963 struct net *net = dev_net(dev);
964 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
966 if (dev != ip6n->fb_tnl_dev)
967 unregister_netdevice_queue(dev, head);
970 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
971 struct nlattr *data[])
974 struct __ip6_tnl_parm p;
975 struct net *net = dev_net(dev);
976 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
978 if (dev == ip6n->fb_tnl_dev)
981 vti6_netlink_parms(data, &p);
983 t = vti6_locate(net, &p, 0);
989 t = netdev_priv(dev);
991 return vti6_update(t, &p);
994 static size_t vti6_get_size(const struct net_device *dev)
1000 nla_total_size(sizeof(struct in6_addr)) +
1001 /* IFLA_VTI_REMOTE */
1002 nla_total_size(sizeof(struct in6_addr)) +
1010 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1012 struct ip6_tnl *tunnel = netdev_priv(dev);
1013 struct __ip6_tnl_parm *parm = &tunnel->parms;
1015 if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1016 nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1017 nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1018 nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1019 nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key))
1020 goto nla_put_failure;
1027 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1028 [IFLA_VTI_LINK] = { .type = NLA_U32 },
1029 [IFLA_VTI_LOCAL] = { .len = sizeof(struct in6_addr) },
1030 [IFLA_VTI_REMOTE] = { .len = sizeof(struct in6_addr) },
1031 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
1032 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
1035 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1037 .maxtype = IFLA_VTI_MAX,
1038 .policy = vti6_policy,
1039 .priv_size = sizeof(struct ip6_tnl),
1040 .setup = vti6_dev_setup,
1041 .validate = vti6_validate,
1042 .newlink = vti6_newlink,
1043 .dellink = vti6_dellink,
1044 .changelink = vti6_changelink,
1045 .get_size = vti6_get_size,
1046 .fill_info = vti6_fill_info,
1047 .get_link_net = ip6_tnl_get_link_net,
1050 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n)
1056 for (h = 0; h < HASH_SIZE; h++) {
1057 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1059 unregister_netdevice_queue(t->dev, &list);
1060 t = rtnl_dereference(t->next);
1064 t = rtnl_dereference(ip6n->tnls_wc[0]);
1065 unregister_netdevice_queue(t->dev, &list);
1066 unregister_netdevice_many(&list);
1069 static int __net_init vti6_init_net(struct net *net)
1071 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1072 struct ip6_tnl *t = NULL;
1075 ip6n->tnls[0] = ip6n->tnls_wc;
1076 ip6n->tnls[1] = ip6n->tnls_r_l;
1079 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1080 NET_NAME_UNKNOWN, vti6_dev_setup);
1082 if (!ip6n->fb_tnl_dev)
1084 dev_net_set(ip6n->fb_tnl_dev, net);
1085 ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1087 err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1091 err = register_netdev(ip6n->fb_tnl_dev);
1095 t = netdev_priv(ip6n->fb_tnl_dev);
1097 strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1101 vti6_dev_free(ip6n->fb_tnl_dev);
1106 static void __net_exit vti6_exit_net(struct net *net)
1108 struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1111 vti6_destroy_tunnels(ip6n);
1115 static struct pernet_operations vti6_net_ops = {
1116 .init = vti6_init_net,
1117 .exit = vti6_exit_net,
1119 .size = sizeof(struct vti6_net),
1122 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1123 .handler = vti6_rcv,
1124 .cb_handler = vti6_rcv_cb,
1125 .err_handler = vti6_err,
1129 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1130 .handler = vti6_rcv,
1131 .cb_handler = vti6_rcv_cb,
1132 .err_handler = vti6_err,
1136 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1137 .handler = vti6_rcv,
1138 .cb_handler = vti6_rcv_cb,
1139 .err_handler = vti6_err,
1144 * vti6_tunnel_init - register protocol and reserve needed resources
1146 * Return: 0 on success
1148 static int __init vti6_tunnel_init(void)
1153 msg = "tunnel device";
1154 err = register_pernet_device(&vti6_net_ops);
1156 goto pernet_dev_failed;
1158 msg = "tunnel protocols";
1159 err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1161 goto xfrm_proto_esp_failed;
1162 err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1164 goto xfrm_proto_ah_failed;
1165 err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1167 goto xfrm_proto_comp_failed;
1169 msg = "netlink interface";
1170 err = rtnl_link_register(&vti6_link_ops);
1172 goto rtnl_link_failed;
1177 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1178 xfrm_proto_comp_failed:
1179 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1180 xfrm_proto_ah_failed:
1181 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1182 xfrm_proto_esp_failed:
1183 unregister_pernet_device(&vti6_net_ops);
1185 pr_err("vti6 init: failed to register %s\n", msg);
1190 * vti6_tunnel_cleanup - free resources and unregister protocol
1192 static void __exit vti6_tunnel_cleanup(void)
1194 rtnl_link_unregister(&vti6_link_ops);
1195 xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1196 xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1197 xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1198 unregister_pernet_device(&vti6_net_ops);
1201 module_init(vti6_tunnel_init);
1202 module_exit(vti6_tunnel_cleanup);
1203 MODULE_LICENSE("GPL");
1204 MODULE_ALIAS_RTNL_LINK("vti6");
1205 MODULE_ALIAS_NETDEV("ip6_vti0");
1206 MODULE_AUTHOR("Steffen Klassert");
1207 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");