1 /*
2 * Linux NET3: IP/IP protocol decoder modified to support
3 * virtual tunnel interface
4 *
5 * Authors:
6 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
7 *
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.
12 *
13 */
14
15 /*
16 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
17
18 For comments look at net/ipv4/ip_gre.c --ANK
19 */
20
21
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>
29 #include <linux/in.h>
30 #include <linux/tcp.h>
31 #include <linux/udp.h>
32 #include <linux/if_arp.h>
33 #include <linux/init.h>
34 #include <linux/netfilter_ipv4.h>
35 #include <linux/if_ether.h>
36 #include <linux/icmpv6.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/icmp.h>
41 #include <net/ip_tunnels.h>
42 #include <net/inet_ecn.h>
43 #include <net/xfrm.h>
44 #include <net/net_namespace.h>
45 #include <net/netns/generic.h>
46
47 static struct rtnl_link_ops vti_link_ops __read_mostly;
48
49 static int vti_net_id __read_mostly;
50 static int vti_tunnel_init(struct net_device *dev);
51
vti_input(struct sk_buff * skb,int nexthdr,__be32 spi,int encap_type)52 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
53 int encap_type)
54 {
55 struct ip_tunnel *tunnel;
56 const struct iphdr *iph = ip_hdr(skb);
57 struct net *net = dev_net(skb->dev);
58 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
59
60 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
61 iph->saddr, iph->daddr, 0);
62 if (tunnel) {
63 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
64 goto drop;
65
66 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
67
68 return xfrm_input(skb, nexthdr, spi, encap_type);
69 }
70
71 return -EINVAL;
72 drop:
73 kfree_skb(skb);
74 return 0;
75 }
76
vti_rcv(struct sk_buff * skb)77 static int vti_rcv(struct sk_buff *skb)
78 {
79 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
80 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
81
82 return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
83 }
84
vti_rcv_cb(struct sk_buff * skb,int err)85 static int vti_rcv_cb(struct sk_buff *skb, int err)
86 {
87 unsigned short family;
88 struct net_device *dev;
89 struct pcpu_sw_netstats *tstats;
90 struct xfrm_state *x;
91 struct xfrm_mode *inner_mode;
92 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
93 u32 orig_mark = skb->mark;
94 int ret;
95
96 if (!tunnel)
97 return 1;
98
99 dev = tunnel->dev;
100
101 if (err) {
102 dev->stats.rx_errors++;
103 dev->stats.rx_dropped++;
104
105 return 0;
106 }
107
108 x = xfrm_input_state(skb);
109
110 inner_mode = x->inner_mode;
111
112 if (x->sel.family == AF_UNSPEC) {
113 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
114 if (inner_mode == NULL) {
115 XFRM_INC_STATS(dev_net(skb->dev),
116 LINUX_MIB_XFRMINSTATEMODEERROR);
117 return -EINVAL;
118 }
119 }
120
121 family = inner_mode->afinfo->family;
122
123 skb->mark = be32_to_cpu(tunnel->parms.i_key);
124 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
125 skb->mark = orig_mark;
126
127 if (!ret)
128 return -EPERM;
129
130 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
131 skb->dev = dev;
132
133 tstats = this_cpu_ptr(dev->tstats);
134
135 u64_stats_update_begin(&tstats->syncp);
136 tstats->rx_packets++;
137 tstats->rx_bytes += skb->len;
138 u64_stats_update_end(&tstats->syncp);
139
140 return 0;
141 }
142
vti_state_check(const struct xfrm_state * x,__be32 dst,__be32 src)143 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
144 {
145 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
146 xfrm_address_t *saddr = (xfrm_address_t *)&src;
147
148 /* if there is no transform then this tunnel is not functional.
149 * Or if the xfrm is not mode tunnel.
150 */
151 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
152 x->props.family != AF_INET)
153 return false;
154
155 if (!dst)
156 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
157
158 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
159 return false;
160
161 return true;
162 }
163
vti_xmit(struct sk_buff * skb,struct net_device * dev,struct flowi * fl)164 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
165 struct flowi *fl)
166 {
167 struct ip_tunnel *tunnel = netdev_priv(dev);
168 struct ip_tunnel_parm *parms = &tunnel->parms;
169 struct dst_entry *dst = skb_dst(skb);
170 struct net_device *tdev; /* Device to other host */
171 int pkt_len = skb->len;
172 int err;
173 int mtu;
174
175 if (!dst) {
176 dev->stats.tx_carrier_errors++;
177 goto tx_error_icmp;
178 }
179
180 dst_hold(dst);
181 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
182 if (IS_ERR(dst)) {
183 dev->stats.tx_carrier_errors++;
184 goto tx_error_icmp;
185 }
186
187 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
188 dev->stats.tx_carrier_errors++;
189 dst_release(dst);
190 goto tx_error_icmp;
191 }
192
193 tdev = dst->dev;
194
195 if (tdev == dev) {
196 dst_release(dst);
197 dev->stats.collisions++;
198 goto tx_error;
199 }
200
201 if (tunnel->err_count > 0) {
202 if (time_before(jiffies,
203 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
204 tunnel->err_count--;
205 dst_link_failure(skb);
206 } else
207 tunnel->err_count = 0;
208 }
209
210 mtu = dst_mtu(dst);
211 if (skb->len > mtu) {
212 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
213 if (skb->protocol == htons(ETH_P_IP)) {
214 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
215 htonl(mtu));
216 } else {
217 if (mtu < IPV6_MIN_MTU)
218 mtu = IPV6_MIN_MTU;
219
220 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
221 }
222
223 dst_release(dst);
224 goto tx_error;
225 }
226
227 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
228 skb_dst_set(skb, dst);
229 skb->dev = skb_dst(skb)->dev;
230
231 err = dst_output(tunnel->net, skb->sk, skb);
232 if (net_xmit_eval(err) == 0)
233 err = pkt_len;
234 iptunnel_xmit_stats(dev, err);
235 return NETDEV_TX_OK;
236
237 tx_error_icmp:
238 dst_link_failure(skb);
239 tx_error:
240 dev->stats.tx_errors++;
241 kfree_skb(skb);
242 return NETDEV_TX_OK;
243 }
244
245 /* This function assumes it is being called from dev_queue_xmit()
246 * and that skb is filled properly by that function.
247 */
vti_tunnel_xmit(struct sk_buff * skb,struct net_device * dev)248 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
249 {
250 struct ip_tunnel *tunnel = netdev_priv(dev);
251 struct flowi fl;
252
253 memset(&fl, 0, sizeof(fl));
254
255 switch (skb->protocol) {
256 case htons(ETH_P_IP):
257 xfrm_decode_session(skb, &fl, AF_INET);
258 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
259 break;
260 case htons(ETH_P_IPV6):
261 xfrm_decode_session(skb, &fl, AF_INET6);
262 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
263 break;
264 default:
265 dev->stats.tx_errors++;
266 dev_kfree_skb(skb);
267 return NETDEV_TX_OK;
268 }
269
270 /* override mark with tunnel output key */
271 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
272
273 return vti_xmit(skb, dev, &fl);
274 }
275
vti4_err(struct sk_buff * skb,u32 info)276 static int vti4_err(struct sk_buff *skb, u32 info)
277 {
278 __be32 spi;
279 __u32 mark;
280 struct xfrm_state *x;
281 struct ip_tunnel *tunnel;
282 struct ip_esp_hdr *esph;
283 struct ip_auth_hdr *ah ;
284 struct ip_comp_hdr *ipch;
285 struct net *net = dev_net(skb->dev);
286 const struct iphdr *iph = (const struct iphdr *)skb->data;
287 int protocol = iph->protocol;
288 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
289
290 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
291 iph->daddr, iph->saddr, 0);
292 if (!tunnel)
293 return -1;
294
295 mark = be32_to_cpu(tunnel->parms.o_key);
296
297 switch (protocol) {
298 case IPPROTO_ESP:
299 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
300 spi = esph->spi;
301 break;
302 case IPPROTO_AH:
303 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
304 spi = ah->spi;
305 break;
306 case IPPROTO_COMP:
307 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
308 spi = htonl(ntohs(ipch->cpi));
309 break;
310 default:
311 return 0;
312 }
313
314 switch (icmp_hdr(skb)->type) {
315 case ICMP_DEST_UNREACH:
316 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
317 return 0;
318 case ICMP_REDIRECT:
319 break;
320 default:
321 return 0;
322 }
323
324 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
325 spi, protocol, AF_INET);
326 if (!x)
327 return 0;
328
329 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
330 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
331 else
332 ipv4_redirect(skb, net, 0, 0, protocol, 0);
333 xfrm_state_put(x);
334
335 return 0;
336 }
337
338 static int
vti_tunnel_ioctl(struct net_device * dev,struct ifreq * ifr,int cmd)339 vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
340 {
341 int err = 0;
342 struct ip_tunnel_parm p;
343
344 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
345 return -EFAULT;
346
347 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
348 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
349 p.iph.ihl != 5)
350 return -EINVAL;
351 }
352
353 if (!(p.i_flags & GRE_KEY))
354 p.i_key = 0;
355 if (!(p.o_flags & GRE_KEY))
356 p.o_key = 0;
357
358 p.i_flags = VTI_ISVTI;
359
360 err = ip_tunnel_ioctl(dev, &p, cmd);
361 if (err)
362 return err;
363
364 if (cmd != SIOCDELTUNNEL) {
365 p.i_flags |= GRE_KEY;
366 p.o_flags |= GRE_KEY;
367 }
368
369 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
370 return -EFAULT;
371 return 0;
372 }
373
374 static const struct net_device_ops vti_netdev_ops = {
375 .ndo_init = vti_tunnel_init,
376 .ndo_uninit = ip_tunnel_uninit,
377 .ndo_start_xmit = vti_tunnel_xmit,
378 .ndo_do_ioctl = vti_tunnel_ioctl,
379 .ndo_change_mtu = ip_tunnel_change_mtu,
380 .ndo_get_stats64 = ip_tunnel_get_stats64,
381 .ndo_get_iflink = ip_tunnel_get_iflink,
382 };
383
vti_tunnel_setup(struct net_device * dev)384 static void vti_tunnel_setup(struct net_device *dev)
385 {
386 dev->netdev_ops = &vti_netdev_ops;
387 dev->type = ARPHRD_TUNNEL;
388 ip_tunnel_setup(dev, vti_net_id);
389 }
390
vti_tunnel_init(struct net_device * dev)391 static int vti_tunnel_init(struct net_device *dev)
392 {
393 struct ip_tunnel *tunnel = netdev_priv(dev);
394 struct iphdr *iph = &tunnel->parms.iph;
395
396 memcpy(dev->dev_addr, &iph->saddr, 4);
397 memcpy(dev->broadcast, &iph->daddr, 4);
398
399 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
400 dev->mtu = ETH_DATA_LEN;
401 dev->flags = IFF_NOARP;
402 dev->addr_len = 4;
403 dev->features |= NETIF_F_LLTX;
404 netif_keep_dst(dev);
405
406 return ip_tunnel_init(dev);
407 }
408
vti_fb_tunnel_init(struct net_device * dev)409 static void __net_init vti_fb_tunnel_init(struct net_device *dev)
410 {
411 struct ip_tunnel *tunnel = netdev_priv(dev);
412 struct iphdr *iph = &tunnel->parms.iph;
413
414 iph->version = 4;
415 iph->protocol = IPPROTO_IPIP;
416 iph->ihl = 5;
417 }
418
419 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
420 .handler = vti_rcv,
421 .input_handler = vti_input,
422 .cb_handler = vti_rcv_cb,
423 .err_handler = vti4_err,
424 .priority = 100,
425 };
426
427 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
428 .handler = vti_rcv,
429 .input_handler = vti_input,
430 .cb_handler = vti_rcv_cb,
431 .err_handler = vti4_err,
432 .priority = 100,
433 };
434
435 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
436 .handler = vti_rcv,
437 .input_handler = vti_input,
438 .cb_handler = vti_rcv_cb,
439 .err_handler = vti4_err,
440 .priority = 100,
441 };
442
vti_init_net(struct net * net)443 static int __net_init vti_init_net(struct net *net)
444 {
445 int err;
446 struct ip_tunnel_net *itn;
447
448 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
449 if (err)
450 return err;
451 itn = net_generic(net, vti_net_id);
452 vti_fb_tunnel_init(itn->fb_tunnel_dev);
453 return 0;
454 }
455
vti_exit_net(struct net * net)456 static void __net_exit vti_exit_net(struct net *net)
457 {
458 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
459 ip_tunnel_delete_net(itn, &vti_link_ops);
460 }
461
462 static struct pernet_operations vti_net_ops = {
463 .init = vti_init_net,
464 .exit = vti_exit_net,
465 .id = &vti_net_id,
466 .size = sizeof(struct ip_tunnel_net),
467 };
468
vti_tunnel_validate(struct nlattr * tb[],struct nlattr * data[])469 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
470 {
471 return 0;
472 }
473
vti_netlink_parms(struct nlattr * data[],struct ip_tunnel_parm * parms)474 static void vti_netlink_parms(struct nlattr *data[],
475 struct ip_tunnel_parm *parms)
476 {
477 memset(parms, 0, sizeof(*parms));
478
479 parms->iph.protocol = IPPROTO_IPIP;
480
481 if (!data)
482 return;
483
484 parms->i_flags = VTI_ISVTI;
485
486 if (data[IFLA_VTI_LINK])
487 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
488
489 if (data[IFLA_VTI_IKEY])
490 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
491
492 if (data[IFLA_VTI_OKEY])
493 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
494
495 if (data[IFLA_VTI_LOCAL])
496 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
497
498 if (data[IFLA_VTI_REMOTE])
499 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
500
501 }
502
vti_newlink(struct net * src_net,struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])503 static int vti_newlink(struct net *src_net, struct net_device *dev,
504 struct nlattr *tb[], struct nlattr *data[])
505 {
506 struct ip_tunnel_parm parms;
507
508 vti_netlink_parms(data, &parms);
509 return ip_tunnel_newlink(dev, tb, &parms);
510 }
511
vti_changelink(struct net_device * dev,struct nlattr * tb[],struct nlattr * data[])512 static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
513 struct nlattr *data[])
514 {
515 struct ip_tunnel_parm p;
516
517 vti_netlink_parms(data, &p);
518 return ip_tunnel_changelink(dev, tb, &p);
519 }
520
vti_get_size(const struct net_device * dev)521 static size_t vti_get_size(const struct net_device *dev)
522 {
523 return
524 /* IFLA_VTI_LINK */
525 nla_total_size(4) +
526 /* IFLA_VTI_IKEY */
527 nla_total_size(4) +
528 /* IFLA_VTI_OKEY */
529 nla_total_size(4) +
530 /* IFLA_VTI_LOCAL */
531 nla_total_size(4) +
532 /* IFLA_VTI_REMOTE */
533 nla_total_size(4) +
534 0;
535 }
536
vti_fill_info(struct sk_buff * skb,const struct net_device * dev)537 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
538 {
539 struct ip_tunnel *t = netdev_priv(dev);
540 struct ip_tunnel_parm *p = &t->parms;
541
542 nla_put_u32(skb, IFLA_VTI_LINK, p->link);
543 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
544 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
545 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr);
546 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr);
547
548 return 0;
549 }
550
551 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
552 [IFLA_VTI_LINK] = { .type = NLA_U32 },
553 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
554 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
555 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
556 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
557 };
558
559 static struct rtnl_link_ops vti_link_ops __read_mostly = {
560 .kind = "vti",
561 .maxtype = IFLA_VTI_MAX,
562 .policy = vti_policy,
563 .priv_size = sizeof(struct ip_tunnel),
564 .setup = vti_tunnel_setup,
565 .validate = vti_tunnel_validate,
566 .newlink = vti_newlink,
567 .changelink = vti_changelink,
568 .dellink = ip_tunnel_dellink,
569 .get_size = vti_get_size,
570 .fill_info = vti_fill_info,
571 .get_link_net = ip_tunnel_get_link_net,
572 };
573
is_vti_tunnel(const struct net_device * dev)574 static bool is_vti_tunnel(const struct net_device *dev)
575 {
576 return dev->netdev_ops == &vti_netdev_ops;
577 }
578
vti_device_event(struct notifier_block * unused,unsigned long event,void * ptr)579 static int vti_device_event(struct notifier_block *unused,
580 unsigned long event, void *ptr)
581 {
582 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
583 struct ip_tunnel *tunnel = netdev_priv(dev);
584
585 if (!is_vti_tunnel(dev))
586 return NOTIFY_DONE;
587
588 switch (event) {
589 case NETDEV_DOWN:
590 if (!net_eq(tunnel->net, dev_net(dev)))
591 xfrm_garbage_collect(tunnel->net);
592 break;
593 }
594 return NOTIFY_DONE;
595 }
596
597 static struct notifier_block vti_notifier_block __read_mostly = {
598 .notifier_call = vti_device_event,
599 };
600
vti_init(void)601 static int __init vti_init(void)
602 {
603 const char *msg;
604 int err;
605
606 pr_info("IPv4 over IPsec tunneling driver\n");
607
608 register_netdevice_notifier(&vti_notifier_block);
609
610 msg = "tunnel device";
611 err = register_pernet_device(&vti_net_ops);
612 if (err < 0)
613 goto pernet_dev_failed;
614
615 msg = "tunnel protocols";
616 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
617 if (err < 0)
618 goto xfrm_proto_esp_failed;
619 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
620 if (err < 0)
621 goto xfrm_proto_ah_failed;
622 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
623 if (err < 0)
624 goto xfrm_proto_comp_failed;
625
626 msg = "netlink interface";
627 err = rtnl_link_register(&vti_link_ops);
628 if (err < 0)
629 goto rtnl_link_failed;
630
631 return err;
632
633 rtnl_link_failed:
634 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
635 xfrm_proto_comp_failed:
636 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
637 xfrm_proto_ah_failed:
638 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
639 xfrm_proto_esp_failed:
640 unregister_pernet_device(&vti_net_ops);
641 pernet_dev_failed:
642 unregister_netdevice_notifier(&vti_notifier_block);
643 pr_err("vti init: failed to register %s\n", msg);
644 return err;
645 }
646
vti_fini(void)647 static void __exit vti_fini(void)
648 {
649 rtnl_link_unregister(&vti_link_ops);
650 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
651 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
652 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
653 unregister_pernet_device(&vti_net_ops);
654 unregister_netdevice_notifier(&vti_notifier_block);
655 }
656
657 module_init(vti_init);
658 module_exit(vti_fini);
659 MODULE_LICENSE("GPL");
660 MODULE_ALIAS_RTNL_LINK("vti");
661 MODULE_ALIAS_NETDEV("ip_vti0");
662