2 * Linux NET3: IP/IP protocol decoder modified to support
3 * virtual tunnel interface
6 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
18 For comments look at net/ipv4/ip_gre.c --ANK
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/types.h>
25 #include <linux/kernel.h>
26 #include <linux/uaccess.h>
27 #include <linux/skbuff.h>
28 #include <linux/netdevice.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/mroute.h>
34 #include <linux/init.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/if_ether.h>
42 #include <net/inet_ecn.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
48 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&(HASH_SIZE-1))
50 static struct rtnl_link_ops vti_link_ops __read_mostly;
52 static int vti_net_id __read_mostly;
54 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
55 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
56 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
57 struct ip_tunnel __rcu *tunnels_wc[1];
58 struct ip_tunnel __rcu **tunnels[4];
60 struct net_device *fb_tunnel_dev;
63 static int vti_fb_tunnel_init(struct net_device *dev);
64 static int vti_tunnel_init(struct net_device *dev);
65 static void vti_tunnel_setup(struct net_device *dev);
66 static void vti_dev_free(struct net_device *dev);
67 static int vti_tunnel_bind_dev(struct net_device *dev);
69 /* Locking : hash tables are protected by RCU and RTNL */
71 #define for_each_ip_tunnel_rcu(start) \
72 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
74 /* often modified stats are per cpu, other are shared (netdev->stats) */
80 struct u64_stats_sync syncp;
83 #define VTI_XMIT(stats1, stats2) do { \
85 int pkt_len = skb->len; \
86 err = dst_output(skb); \
87 if (net_xmit_eval(err) == 0) { \
88 u64_stats_update_begin(&(stats1)->syncp); \
89 (stats1)->tx_bytes += pkt_len; \
90 (stats1)->tx_packets++; \
91 u64_stats_update_end(&(stats1)->syncp); \
93 (stats2)->tx_errors++; \
94 (stats2)->tx_aborted_errors++; \
99 static struct rtnl_link_stats64 *vti_get_stats64(struct net_device *dev,
100 struct rtnl_link_stats64 *tot)
104 for_each_possible_cpu(i) {
105 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
106 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
110 start = u64_stats_fetch_begin_bh(&tstats->syncp);
111 rx_packets = tstats->rx_packets;
112 tx_packets = tstats->tx_packets;
113 rx_bytes = tstats->rx_bytes;
114 tx_bytes = tstats->tx_bytes;
115 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
117 tot->rx_packets += rx_packets;
118 tot->tx_packets += tx_packets;
119 tot->rx_bytes += rx_bytes;
120 tot->tx_bytes += tx_bytes;
123 tot->multicast = dev->stats.multicast;
124 tot->rx_crc_errors = dev->stats.rx_crc_errors;
125 tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
126 tot->rx_length_errors = dev->stats.rx_length_errors;
127 tot->rx_errors = dev->stats.rx_errors;
128 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
129 tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
130 tot->tx_dropped = dev->stats.tx_dropped;
131 tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
132 tot->tx_errors = dev->stats.tx_errors;
137 static struct ip_tunnel *vti_tunnel_lookup(struct net *net,
138 __be32 remote, __be32 local)
140 unsigned h0 = HASH(remote);
141 unsigned h1 = HASH(local);
143 struct vti_net *ipn = net_generic(net, vti_net_id);
145 for_each_ip_tunnel_rcu(ipn->tunnels_r_l[h0 ^ h1])
146 if (local == t->parms.iph.saddr &&
147 remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
149 for_each_ip_tunnel_rcu(ipn->tunnels_r[h0])
150 if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
153 for_each_ip_tunnel_rcu(ipn->tunnels_l[h1])
154 if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
157 for_each_ip_tunnel_rcu(ipn->tunnels_wc[0])
158 if (t && (t->dev->flags&IFF_UP))
163 static struct ip_tunnel __rcu **__vti_bucket(struct vti_net *ipn,
164 struct ip_tunnel_parm *parms)
166 __be32 remote = parms->iph.daddr;
167 __be32 local = parms->iph.saddr;
179 return &ipn->tunnels[prio][h];
182 static inline struct ip_tunnel __rcu **vti_bucket(struct vti_net *ipn,
185 return __vti_bucket(ipn, &t->parms);
188 static void vti_tunnel_unlink(struct vti_net *ipn, struct ip_tunnel *t)
190 struct ip_tunnel __rcu **tp;
191 struct ip_tunnel *iter;
193 for (tp = vti_bucket(ipn, t);
194 (iter = rtnl_dereference(*tp)) != NULL;
197 rcu_assign_pointer(*tp, t->next);
203 static void vti_tunnel_link(struct vti_net *ipn, struct ip_tunnel *t)
205 struct ip_tunnel __rcu **tp = vti_bucket(ipn, t);
207 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
208 rcu_assign_pointer(*tp, t);
211 static struct ip_tunnel *vti_tunnel_locate(struct net *net,
212 struct ip_tunnel_parm *parms,
215 __be32 remote = parms->iph.daddr;
216 __be32 local = parms->iph.saddr;
217 struct ip_tunnel *t, *nt;
218 struct ip_tunnel __rcu **tp;
219 struct net_device *dev;
221 struct vti_net *ipn = net_generic(net, vti_net_id);
223 for (tp = __vti_bucket(ipn, parms);
224 (t = rtnl_dereference(*tp)) != NULL;
226 if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
233 strlcpy(name, parms->name, IFNAMSIZ);
235 strcpy(name, "vti%d");
237 dev = alloc_netdev(sizeof(*t), name, vti_tunnel_setup);
241 dev_net_set(dev, net);
243 nt = netdev_priv(dev);
245 dev->rtnl_link_ops = &vti_link_ops;
247 vti_tunnel_bind_dev(dev);
249 if (register_netdevice(dev) < 0)
253 vti_tunnel_link(ipn, nt);
261 static void vti_tunnel_uninit(struct net_device *dev)
263 struct net *net = dev_net(dev);
264 struct vti_net *ipn = net_generic(net, vti_net_id);
266 vti_tunnel_unlink(ipn, netdev_priv(dev));
270 static int vti_err(struct sk_buff *skb, u32 info)
273 /* All the routers (except for Linux) return only
274 * 8 bytes of packet payload. It means, that precise relaying of
275 * ICMP in the real Internet is absolutely infeasible.
277 struct iphdr *iph = (struct iphdr *)skb->data;
278 const int type = icmp_hdr(skb)->type;
279 const int code = icmp_hdr(skb)->code;
285 case ICMP_PARAMETERPROB:
288 case ICMP_DEST_UNREACH:
291 case ICMP_PORT_UNREACH:
292 /* Impossible event. */
295 /* All others are translated to HOST_UNREACH. */
299 case ICMP_TIME_EXCEEDED:
300 if (code != ICMP_EXC_TTL)
307 t = vti_tunnel_lookup(dev_net(skb->dev), iph->daddr, iph->saddr);
311 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
312 ipv4_update_pmtu(skb, dev_net(skb->dev), info,
313 t->parms.link, 0, IPPROTO_IPIP, 0);
319 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
322 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
326 t->err_time = jiffies;
331 /* We dont digest the packet therefore let the packet pass */
332 static int vti_rcv(struct sk_buff *skb)
334 struct ip_tunnel *tunnel;
335 const struct iphdr *iph = ip_hdr(skb);
337 tunnel = vti_tunnel_lookup(dev_net(skb->dev), iph->saddr, iph->daddr);
338 if (tunnel != NULL) {
339 struct pcpu_tstats *tstats;
341 tstats = this_cpu_ptr(tunnel->dev->tstats);
342 u64_stats_update_begin(&tstats->syncp);
343 tstats->rx_packets++;
344 tstats->rx_bytes += skb->len;
345 u64_stats_update_end(&tstats->syncp);
347 skb->dev = tunnel->dev;
354 /* This function assumes it is being called from dev_queue_xmit()
355 * and that skb is filled properly by that function.
358 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
360 struct ip_tunnel *tunnel = netdev_priv(dev);
361 struct pcpu_tstats *tstats;
362 struct iphdr *tiph = &tunnel->parms.iph;
364 struct rtable *rt; /* Route to the other host */
365 struct net_device *tdev; /* Device to other host */
366 struct iphdr *old_iph = ip_hdr(skb);
367 __be32 dst = tiph->daddr;
370 if (skb->protocol != htons(ETH_P_IP))
375 memset(&fl4, 0, sizeof(fl4));
376 flowi4_init_output(&fl4, tunnel->parms.link,
377 be32_to_cpu(tunnel->parms.i_key), RT_TOS(tos),
380 dst, tiph->saddr, 0, 0);
381 rt = ip_route_output_key(dev_net(dev), &fl4);
383 dev->stats.tx_carrier_errors++;
386 /* if there is no transform then this tunnel is not functional.
387 * Or if the xfrm is not mode tunnel.
390 rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
391 dev->stats.tx_carrier_errors++;
398 dev->stats.collisions++;
402 if (tunnel->err_count > 0) {
403 if (time_before(jiffies,
404 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
406 dst_link_failure(skb);
408 tunnel->err_count = 0;
411 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
414 skb_dst_set(skb, &rt->dst);
416 skb->dev = skb_dst(skb)->dev;
418 tstats = this_cpu_ptr(dev->tstats);
419 VTI_XMIT(tstats, &dev->stats);
423 dst_link_failure(skb);
425 dev->stats.tx_errors++;
430 static int vti_tunnel_bind_dev(struct net_device *dev)
432 struct net_device *tdev = NULL;
433 struct ip_tunnel *tunnel;
436 tunnel = netdev_priv(dev);
437 iph = &tunnel->parms.iph;
442 memset(&fl4, 0, sizeof(fl4));
443 flowi4_init_output(&fl4, tunnel->parms.link,
444 be32_to_cpu(tunnel->parms.i_key),
445 RT_TOS(iph->tos), RT_SCOPE_UNIVERSE,
447 iph->daddr, iph->saddr, 0, 0);
448 rt = ip_route_output_key(dev_net(dev), &fl4);
453 dev->flags |= IFF_POINTOPOINT;
456 if (!tdev && tunnel->parms.link)
457 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
460 dev->hard_header_len = tdev->hard_header_len +
461 sizeof(struct iphdr);
462 dev->mtu = tdev->mtu;
464 dev->iflink = tunnel->parms.link;
469 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
472 struct ip_tunnel_parm p;
474 struct net *net = dev_net(dev);
475 struct vti_net *ipn = net_generic(net, vti_net_id);
480 if (dev == ipn->fb_tunnel_dev) {
481 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
486 t = vti_tunnel_locate(net, &p, 0);
489 t = netdev_priv(dev);
490 memcpy(&p, &t->parms, sizeof(p));
491 p.i_flags |= GRE_KEY | VTI_ISVTI;
492 p.o_flags |= GRE_KEY;
493 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
500 if (!capable(CAP_NET_ADMIN))
504 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
508 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
512 t = vti_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
514 if (dev != ipn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
521 if (((dev->flags&IFF_POINTOPOINT) &&
523 (!(dev->flags&IFF_POINTOPOINT) &&
528 t = netdev_priv(dev);
529 vti_tunnel_unlink(ipn, t);
531 t->parms.iph.saddr = p.iph.saddr;
532 t->parms.iph.daddr = p.iph.daddr;
533 t->parms.i_key = p.i_key;
534 t->parms.o_key = p.o_key;
535 t->parms.iph.protocol = IPPROTO_IPIP;
536 memcpy(dev->dev_addr, &p.iph.saddr, 4);
537 memcpy(dev->broadcast, &p.iph.daddr, 4);
538 vti_tunnel_link(ipn, t);
539 netdev_state_change(dev);
545 if (cmd == SIOCCHGTUNNEL) {
546 t->parms.i_key = p.i_key;
547 t->parms.o_key = p.o_key;
548 if (t->parms.link != p.link) {
549 t->parms.link = p.link;
550 vti_tunnel_bind_dev(dev);
551 netdev_state_change(dev);
554 p.i_flags |= GRE_KEY | VTI_ISVTI;
555 p.o_flags |= GRE_KEY;
556 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms,
560 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
565 if (!capable(CAP_NET_ADMIN))
568 if (dev == ipn->fb_tunnel_dev) {
570 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data,
575 t = vti_tunnel_locate(net, &p, 0);
579 if (t->dev == ipn->fb_tunnel_dev)
583 unregister_netdevice(dev);
595 static int vti_tunnel_change_mtu(struct net_device *dev, int new_mtu)
597 if (new_mtu < 68 || new_mtu > 0xFFF8)
603 static const struct net_device_ops vti_netdev_ops = {
604 .ndo_init = vti_tunnel_init,
605 .ndo_uninit = vti_tunnel_uninit,
606 .ndo_start_xmit = vti_tunnel_xmit,
607 .ndo_do_ioctl = vti_tunnel_ioctl,
608 .ndo_change_mtu = vti_tunnel_change_mtu,
609 .ndo_get_stats64 = vti_get_stats64,
612 static void vti_dev_free(struct net_device *dev)
614 free_percpu(dev->tstats);
618 static void vti_tunnel_setup(struct net_device *dev)
620 dev->netdev_ops = &vti_netdev_ops;
621 dev->destructor = vti_dev_free;
623 dev->type = ARPHRD_TUNNEL;
624 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
625 dev->mtu = ETH_DATA_LEN;
626 dev->flags = IFF_NOARP;
629 dev->features |= NETIF_F_NETNS_LOCAL;
630 dev->features |= NETIF_F_LLTX;
631 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
634 static int vti_tunnel_init(struct net_device *dev)
636 struct ip_tunnel *tunnel = netdev_priv(dev);
639 strcpy(tunnel->parms.name, dev->name);
641 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
642 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
644 dev->tstats = alloc_percpu(struct pcpu_tstats);
651 static int __net_init vti_fb_tunnel_init(struct net_device *dev)
653 struct ip_tunnel *tunnel = netdev_priv(dev);
654 struct iphdr *iph = &tunnel->parms.iph;
655 struct vti_net *ipn = net_generic(dev_net(dev), vti_net_id);
658 strcpy(tunnel->parms.name, dev->name);
661 iph->protocol = IPPROTO_IPIP;
664 dev->tstats = alloc_percpu(struct pcpu_tstats);
669 rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
673 static struct xfrm_tunnel vti_handler __read_mostly = {
675 .err_handler = vti_err,
679 static void vti_destroy_tunnels(struct vti_net *ipn, struct list_head *head)
683 for (prio = 1; prio < 4; prio++) {
685 for (h = 0; h < HASH_SIZE; h++) {
688 t = rtnl_dereference(ipn->tunnels[prio][h]);
690 unregister_netdevice_queue(t->dev, head);
691 t = rtnl_dereference(t->next);
697 static int __net_init vti_init_net(struct net *net)
700 struct vti_net *ipn = net_generic(net, vti_net_id);
702 ipn->tunnels[0] = ipn->tunnels_wc;
703 ipn->tunnels[1] = ipn->tunnels_l;
704 ipn->tunnels[2] = ipn->tunnels_r;
705 ipn->tunnels[3] = ipn->tunnels_r_l;
707 ipn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel),
710 if (!ipn->fb_tunnel_dev) {
714 dev_net_set(ipn->fb_tunnel_dev, net);
716 err = vti_fb_tunnel_init(ipn->fb_tunnel_dev);
719 ipn->fb_tunnel_dev->rtnl_link_ops = &vti_link_ops;
721 err = register_netdev(ipn->fb_tunnel_dev);
727 vti_dev_free(ipn->fb_tunnel_dev);
733 static void __net_exit vti_exit_net(struct net *net)
735 struct vti_net *ipn = net_generic(net, vti_net_id);
739 vti_destroy_tunnels(ipn, &list);
740 unregister_netdevice_many(&list);
744 static struct pernet_operations vti_net_ops = {
745 .init = vti_init_net,
746 .exit = vti_exit_net,
748 .size = sizeof(struct vti_net),
751 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
756 static void vti_netlink_parms(struct nlattr *data[],
757 struct ip_tunnel_parm *parms)
759 memset(parms, 0, sizeof(*parms));
761 parms->iph.protocol = IPPROTO_IPIP;
766 if (data[IFLA_VTI_LINK])
767 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
769 if (data[IFLA_VTI_IKEY])
770 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
772 if (data[IFLA_VTI_OKEY])
773 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
775 if (data[IFLA_VTI_LOCAL])
776 parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
778 if (data[IFLA_VTI_REMOTE])
779 parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
783 static int vti_newlink(struct net *src_net, struct net_device *dev,
784 struct nlattr *tb[], struct nlattr *data[])
786 struct ip_tunnel *nt;
787 struct net *net = dev_net(dev);
788 struct vti_net *ipn = net_generic(net, vti_net_id);
792 nt = netdev_priv(dev);
793 vti_netlink_parms(data, &nt->parms);
795 if (vti_tunnel_locate(net, &nt->parms, 0))
798 mtu = vti_tunnel_bind_dev(dev);
802 err = register_netdevice(dev);
807 vti_tunnel_link(ipn, nt);
813 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
814 struct nlattr *data[])
816 struct ip_tunnel *t, *nt;
817 struct net *net = dev_net(dev);
818 struct vti_net *ipn = net_generic(net, vti_net_id);
819 struct ip_tunnel_parm p;
822 if (dev == ipn->fb_tunnel_dev)
825 nt = netdev_priv(dev);
826 vti_netlink_parms(data, &p);
828 t = vti_tunnel_locate(net, &p, 0);
836 vti_tunnel_unlink(ipn, t);
837 t->parms.iph.saddr = p.iph.saddr;
838 t->parms.iph.daddr = p.iph.daddr;
839 t->parms.i_key = p.i_key;
840 t->parms.o_key = p.o_key;
841 if (dev->type != ARPHRD_ETHER) {
842 memcpy(dev->dev_addr, &p.iph.saddr, 4);
843 memcpy(dev->broadcast, &p.iph.daddr, 4);
845 vti_tunnel_link(ipn, t);
846 netdev_state_change(dev);
849 if (t->parms.link != p.link) {
850 t->parms.link = p.link;
851 mtu = vti_tunnel_bind_dev(dev);
854 netdev_state_change(dev);
860 static size_t vti_get_size(const struct net_device *dev)
871 /* IFLA_VTI_REMOTE */
876 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
878 struct ip_tunnel *t = netdev_priv(dev);
879 struct ip_tunnel_parm *p = &t->parms;
881 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
882 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
883 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
884 nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
885 nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
890 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
891 [IFLA_VTI_LINK] = { .type = NLA_U32 },
892 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
893 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
894 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
895 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
898 static struct rtnl_link_ops vti_link_ops __read_mostly = {
900 .maxtype = IFLA_VTI_MAX,
901 .policy = vti_policy,
902 .priv_size = sizeof(struct ip_tunnel),
903 .setup = vti_tunnel_setup,
904 .validate = vti_tunnel_validate,
905 .newlink = vti_newlink,
906 .changelink = vti_changelink,
907 .get_size = vti_get_size,
908 .fill_info = vti_fill_info,
911 static int __init vti_init(void)
915 pr_info("IPv4 over IPSec tunneling driver\n");
917 err = register_pernet_device(&vti_net_ops);
920 err = xfrm4_mode_tunnel_input_register(&vti_handler);
922 unregister_pernet_device(&vti_net_ops);
923 pr_info(KERN_INFO "vti init: can't register tunnel\n");
926 err = rtnl_link_register(&vti_link_ops);
928 goto rtnl_link_failed;
933 xfrm4_mode_tunnel_input_deregister(&vti_handler);
934 unregister_pernet_device(&vti_net_ops);
938 static void __exit vti_fini(void)
940 rtnl_link_unregister(&vti_link_ops);
941 if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
942 pr_info("vti close: can't deregister tunnel\n");
944 unregister_pernet_device(&vti_net_ops);
947 module_init(vti_init);
948 module_exit(vti_fini);
949 MODULE_LICENSE("GPL");
950 MODULE_ALIAS_RTNL_LINK("vti");
951 MODULE_ALIAS_NETDEV("ip_vti0");