blob: 33a85269a9f2615f6c26d324fb0950fd6e4a6f0f [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +08001/*
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
47static struct rtnl_link_ops vti_link_ops __read_mostly;
48
49static unsigned int vti_net_id __read_mostly;
50static int vti_tunnel_init(struct net_device *dev);
51
52static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
53 int encap_type, bool update_skb_dev)
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 if (update_skb_dev)
69 skb->dev = tunnel->dev;
70
71 return xfrm_input(skb, nexthdr, spi, encap_type);
72 }
73
74 return -EINVAL;
75drop:
76 kfree_skb(skb);
77 return 0;
78}
79
80static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
81 int encap_type)
82{
83 return vti_input(skb, nexthdr, spi, encap_type, false);
84}
85
86static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev)
87{
88 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
89 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
90
91 return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev);
92}
93
94static int vti_rcv_proto(struct sk_buff *skb)
95{
96 return vti_rcv(skb, 0, false);
97}
98
99static int vti_rcv_tunnel(struct sk_buff *skb)
100{
101 struct ip_tunnel_net *itn = net_generic(dev_net(skb->dev), vti_net_id);
102 const struct iphdr *iph = ip_hdr(skb);
103 struct ip_tunnel *tunnel;
104
105 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
106 iph->saddr, iph->daddr, 0);
107 if (tunnel) {
108 struct tnl_ptk_info tpi = {
109 .proto = htons(ETH_P_IP),
110 };
111
112 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
113 goto drop;
114 if (iptunnel_pull_header(skb, 0, tpi.proto, false))
115 goto drop;
116 return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, false);
117 }
118
119 return -EINVAL;
120drop:
121 kfree_skb(skb);
122 return 0;
123}
124
125static int vti_rcv_cb(struct sk_buff *skb, int err)
126{
127 unsigned short family;
128 struct net_device *dev;
129 struct pcpu_sw_netstats *tstats;
130 struct xfrm_state *x;
131 struct xfrm_mode *inner_mode;
132 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
133 u32 orig_mark = skb->mark;
134 int ret;
135
136 if (!tunnel)
137 return 1;
138
139 dev = tunnel->dev;
140
141 if (err) {
142 dev->stats.rx_errors++;
143 dev->stats.rx_dropped++;
144
145 return 0;
146 }
147
148 x = xfrm_input_state(skb);
149
150 inner_mode = x->inner_mode;
151
152 if (x->sel.family == AF_UNSPEC) {
153 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
154 if (inner_mode == NULL) {
155 XFRM_INC_STATS(dev_net(skb->dev),
156 LINUX_MIB_XFRMINSTATEMODEERROR);
157 return -EINVAL;
158 }
159 }
160
161 family = inner_mode->afinfo->family;
162
163 skb->mark = be32_to_cpu(tunnel->parms.i_key);
164 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
165 skb->mark = orig_mark;
166
167 if (!ret)
168 return -EPERM;
169
170 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
171 skb->dev = dev;
172
173 tstats = this_cpu_ptr(dev->tstats);
174
175 u64_stats_update_begin(&tstats->syncp);
176 tstats->rx_packets++;
177 tstats->rx_bytes += skb->len;
178 u64_stats_update_end(&tstats->syncp);
179
180 return 0;
181}
182
183static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
184{
185 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
186 xfrm_address_t *saddr = (xfrm_address_t *)&src;
187
188 /* if there is no transform then this tunnel is not functional.
189 * Or if the xfrm is not mode tunnel.
190 */
191 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
192 x->props.family != AF_INET)
193 return false;
194
195 if (!dst)
196 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
197
198 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
199 return false;
200
201 return true;
202}
203
204static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
205 struct flowi *fl)
206{
207 struct ip_tunnel *tunnel = netdev_priv(dev);
208 struct ip_tunnel_parm *parms = &tunnel->parms;
209 struct dst_entry *dst = skb_dst(skb);
210 struct net_device *tdev; /* Device to other host */
211 int pkt_len = skb->len;
212 int err;
213 int mtu;
214
215 if (!dst) {
216 switch (skb->protocol) {
217 case htons(ETH_P_IP): {
218 struct rtable *rt;
219
220 fl->u.ip4.flowi4_oif = dev->ifindex;
221 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
222 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
223 if (IS_ERR(rt)) {
224 dev->stats.tx_carrier_errors++;
225 goto tx_error_icmp;
226 }
227 dst = &rt->dst;
228 skb_dst_set(skb, dst);
229 break;
230 }
231#if IS_ENABLED(CONFIG_IPV6)
232 case htons(ETH_P_IPV6):
233 fl->u.ip6.flowi6_oif = dev->ifindex;
234 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
235 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
236 if (dst->error) {
237 dst_release(dst);
238 dst = NULL;
239 dev->stats.tx_carrier_errors++;
240 goto tx_error_icmp;
241 }
242 skb_dst_set(skb, dst);
243 break;
244#endif
245 default:
246 dev->stats.tx_carrier_errors++;
247 goto tx_error_icmp;
248 }
249 }
250
251 dst_hold(dst);
252 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
253 if (IS_ERR(dst)) {
254 dev->stats.tx_carrier_errors++;
255 goto tx_error_icmp;
256 }
257
258 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
259 dev->stats.tx_carrier_errors++;
260 dst_release(dst);
261 goto tx_error_icmp;
262 }
263
264 tdev = dst->dev;
265
266 if (tdev == dev) {
267 dst_release(dst);
268 dev->stats.collisions++;
269 goto tx_error;
270 }
271
272 if (tunnel->err_count > 0) {
273 if (time_before(jiffies,
274 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
275 tunnel->err_count--;
276 dst_link_failure(skb);
277 } else
278 tunnel->err_count = 0;
279 }
280
281 mtu = dst_mtu(dst);
282 if (skb->len > mtu) {
283 skb_dst_update_pmtu_no_confirm(skb, mtu);
284 if (skb->protocol == htons(ETH_P_IP)) {
285 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
286 htonl(mtu));
287 } else {
288 if (mtu < IPV6_MIN_MTU)
289 mtu = IPV6_MIN_MTU;
290
291 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
292 }
293
294 dst_release(dst);
295 goto tx_error;
296 }
297
298 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
299 skb_dst_set(skb, dst);
300 skb->dev = skb_dst(skb)->dev;
301
302 err = dst_output(tunnel->net, skb->sk, skb);
303 if (net_xmit_eval(err) == 0)
304 err = pkt_len;
305 iptunnel_xmit_stats(dev, err);
306 return NETDEV_TX_OK;
307
308tx_error_icmp:
309 dst_link_failure(skb);
310tx_error:
311 dev->stats.tx_errors++;
312 kfree_skb(skb);
313 return NETDEV_TX_OK;
314}
315
316/* This function assumes it is being called from dev_queue_xmit()
317 * and that skb is filled properly by that function.
318 */
319static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
320{
321 struct ip_tunnel *tunnel = netdev_priv(dev);
322 struct flowi fl;
323
324 memset(&fl, 0, sizeof(fl));
325
326 switch (skb->protocol) {
327 case htons(ETH_P_IP):
328 xfrm_decode_session(skb, &fl, AF_INET);
329 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
330 break;
331 case htons(ETH_P_IPV6):
332 xfrm_decode_session(skb, &fl, AF_INET6);
333 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
334 break;
335 default:
336 dev->stats.tx_errors++;
337 dev_kfree_skb(skb);
338 return NETDEV_TX_OK;
339 }
340
341 /* override mark with tunnel output key */
342 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
343
344 return vti_xmit(skb, dev, &fl);
345}
346
347static int vti4_err(struct sk_buff *skb, u32 info)
348{
349 __be32 spi;
350 __u32 mark;
351 struct xfrm_state *x;
352 struct ip_tunnel *tunnel;
353 struct ip_esp_hdr *esph;
354 struct ip_auth_hdr *ah ;
355 struct ip_comp_hdr *ipch;
356 struct net *net = dev_net(skb->dev);
357 const struct iphdr *iph = (const struct iphdr *)skb->data;
358 int protocol = iph->protocol;
359 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
360
361 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
362 iph->daddr, iph->saddr, 0);
363 if (!tunnel)
364 return -1;
365
366 mark = be32_to_cpu(tunnel->parms.o_key);
367
368 switch (protocol) {
369 case IPPROTO_ESP:
370 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
371 spi = esph->spi;
372 break;
373 case IPPROTO_AH:
374 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
375 spi = ah->spi;
376 break;
377 case IPPROTO_COMP:
378 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
379 spi = htonl(ntohs(ipch->cpi));
380 break;
381 default:
382 return 0;
383 }
384
385 switch (icmp_hdr(skb)->type) {
386 case ICMP_DEST_UNREACH:
387 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
388 return 0;
389 case ICMP_REDIRECT:
390 break;
391 default:
392 return 0;
393 }
394
395 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
396 spi, protocol, AF_INET);
397 if (!x)
398 return 0;
399
400 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
401 ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
402 else
403 ipv4_redirect(skb, net, 0, 0, protocol, 0);
404 xfrm_state_put(x);
405
406 return 0;
407}
408
409static int
410vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
411{
412 int err = 0;
413 struct ip_tunnel_parm p;
414
415 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
416 return -EFAULT;
417
418 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
419 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
420 p.iph.ihl != 5)
421 return -EINVAL;
422 }
423
424 if (!(p.i_flags & GRE_KEY))
425 p.i_key = 0;
426 if (!(p.o_flags & GRE_KEY))
427 p.o_key = 0;
428
429 p.i_flags = VTI_ISVTI;
430
431 err = ip_tunnel_ioctl(dev, &p, cmd);
432 if (err)
433 return err;
434
435 if (cmd != SIOCDELTUNNEL) {
436 p.i_flags |= GRE_KEY;
437 p.o_flags |= GRE_KEY;
438 }
439
440 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
441 return -EFAULT;
442 return 0;
443}
444
445static const struct net_device_ops vti_netdev_ops = {
446 .ndo_init = vti_tunnel_init,
447 .ndo_uninit = ip_tunnel_uninit,
448 .ndo_start_xmit = vti_tunnel_xmit,
449 .ndo_do_ioctl = vti_tunnel_ioctl,
450 .ndo_change_mtu = ip_tunnel_change_mtu,
451 .ndo_get_stats64 = ip_tunnel_get_stats64,
452 .ndo_get_iflink = ip_tunnel_get_iflink,
453};
454
455static void vti_tunnel_setup(struct net_device *dev)
456{
457 dev->netdev_ops = &vti_netdev_ops;
458 dev->type = ARPHRD_TUNNEL;
459 ip_tunnel_setup(dev, vti_net_id);
460}
461
462static int vti_tunnel_init(struct net_device *dev)
463{
464 struct ip_tunnel *tunnel = netdev_priv(dev);
465 struct iphdr *iph = &tunnel->parms.iph;
466
467 memcpy(dev->dev_addr, &iph->saddr, 4);
468 memcpy(dev->broadcast, &iph->daddr, 4);
469
470 dev->mtu = ETH_DATA_LEN;
471 dev->flags = IFF_NOARP;
472 dev->addr_len = 4;
473 dev->features |= NETIF_F_LLTX;
474 netif_keep_dst(dev);
475
476 return ip_tunnel_init(dev);
477}
478
479static void __net_init vti_fb_tunnel_init(struct net_device *dev)
480{
481 struct ip_tunnel *tunnel = netdev_priv(dev);
482 struct iphdr *iph = &tunnel->parms.iph;
483
484 iph->version = 4;
485 iph->protocol = IPPROTO_IPIP;
486 iph->ihl = 5;
487}
488
489static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
490 .handler = vti_rcv_proto,
491 .input_handler = vti_input_proto,
492 .cb_handler = vti_rcv_cb,
493 .err_handler = vti4_err,
494 .priority = 100,
495};
496
497static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
498 .handler = vti_rcv_proto,
499 .input_handler = vti_input_proto,
500 .cb_handler = vti_rcv_cb,
501 .err_handler = vti4_err,
502 .priority = 100,
503};
504
505static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
506 .handler = vti_rcv_proto,
507 .input_handler = vti_input_proto,
508 .cb_handler = vti_rcv_cb,
509 .err_handler = vti4_err,
510 .priority = 100,
511};
512
513static struct xfrm_tunnel ipip_handler __read_mostly = {
514 .handler = vti_rcv_tunnel,
515 .err_handler = vti4_err,
516 .priority = 0,
517};
518
519static int __net_init vti_init_net(struct net *net)
520{
521 int err;
522 struct ip_tunnel_net *itn;
523
524 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
525 if (err)
526 return err;
527 itn = net_generic(net, vti_net_id);
528 vti_fb_tunnel_init(itn->fb_tunnel_dev);
529 return 0;
530}
531
532static void __net_exit vti_exit_net(struct net *net)
533{
534 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
535 ip_tunnel_delete_net(itn, &vti_link_ops);
536}
537
538static struct pernet_operations vti_net_ops = {
539 .init = vti_init_net,
540 .exit = vti_exit_net,
541 .id = &vti_net_id,
542 .size = sizeof(struct ip_tunnel_net),
543};
544
545static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
546 struct netlink_ext_ack *extack)
547{
548 return 0;
549}
550
551static void vti_netlink_parms(struct nlattr *data[],
552 struct ip_tunnel_parm *parms,
553 __u32 *fwmark)
554{
555 memset(parms, 0, sizeof(*parms));
556
557 parms->iph.protocol = IPPROTO_IPIP;
558
559 if (!data)
560 return;
561
562 parms->i_flags = VTI_ISVTI;
563
564 if (data[IFLA_VTI_LINK])
565 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
566
567 if (data[IFLA_VTI_IKEY])
568 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
569
570 if (data[IFLA_VTI_OKEY])
571 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
572
573 if (data[IFLA_VTI_LOCAL])
574 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
575
576 if (data[IFLA_VTI_REMOTE])
577 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
578
579 if (data[IFLA_VTI_FWMARK])
580 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
581}
582
583static int vti_newlink(struct net *src_net, struct net_device *dev,
584 struct nlattr *tb[], struct nlattr *data[],
585 struct netlink_ext_ack *extack)
586{
587 struct ip_tunnel_parm parms;
588 __u32 fwmark = 0;
589
590 vti_netlink_parms(data, &parms, &fwmark);
591 return ip_tunnel_newlink(dev, tb, &parms, fwmark);
592}
593
594static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
595 struct nlattr *data[],
596 struct netlink_ext_ack *extack)
597{
598 struct ip_tunnel *t = netdev_priv(dev);
599 __u32 fwmark = t->fwmark;
600 struct ip_tunnel_parm p;
601
602 vti_netlink_parms(data, &p, &fwmark);
603 return ip_tunnel_changelink(dev, tb, &p, fwmark);
604}
605
606static size_t vti_get_size(const struct net_device *dev)
607{
608 return
609 /* IFLA_VTI_LINK */
610 nla_total_size(4) +
611 /* IFLA_VTI_IKEY */
612 nla_total_size(4) +
613 /* IFLA_VTI_OKEY */
614 nla_total_size(4) +
615 /* IFLA_VTI_LOCAL */
616 nla_total_size(4) +
617 /* IFLA_VTI_REMOTE */
618 nla_total_size(4) +
619 /* IFLA_VTI_FWMARK */
620 nla_total_size(4) +
621 0;
622}
623
624static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
625{
626 struct ip_tunnel *t = netdev_priv(dev);
627 struct ip_tunnel_parm *p = &t->parms;
628
629 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
630 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
631 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
632 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
633 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
634 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
635 return -EMSGSIZE;
636
637 return 0;
638}
639
640static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
641 [IFLA_VTI_LINK] = { .type = NLA_U32 },
642 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
643 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
644 [IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
645 [IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
646 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
647};
648
649static struct rtnl_link_ops vti_link_ops __read_mostly = {
650 .kind = "vti",
651 .maxtype = IFLA_VTI_MAX,
652 .policy = vti_policy,
653 .priv_size = sizeof(struct ip_tunnel),
654 .setup = vti_tunnel_setup,
655 .validate = vti_tunnel_validate,
656 .newlink = vti_newlink,
657 .changelink = vti_changelink,
658 .dellink = ip_tunnel_dellink,
659 .get_size = vti_get_size,
660 .fill_info = vti_fill_info,
661 .get_link_net = ip_tunnel_get_link_net,
662};
663
664static int __init vti_init(void)
665{
666 const char *msg;
667 int err;
668
669 pr_info("IPv4 over IPsec tunneling driver\n");
670
671 msg = "tunnel device";
672 err = register_pernet_device(&vti_net_ops);
673 if (err < 0)
674 goto pernet_dev_failed;
675
676 msg = "tunnel protocols";
677 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
678 if (err < 0)
679 goto xfrm_proto_esp_failed;
680 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
681 if (err < 0)
682 goto xfrm_proto_ah_failed;
683 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
684 if (err < 0)
685 goto xfrm_proto_comp_failed;
686
687 msg = "ipip tunnel";
688 err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
689 if (err < 0)
690 goto xfrm_tunnel_failed;
691
692 msg = "netlink interface";
693 err = rtnl_link_register(&vti_link_ops);
694 if (err < 0)
695 goto rtnl_link_failed;
696
697 return err;
698
699rtnl_link_failed:
700 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
701xfrm_tunnel_failed:
702 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
703xfrm_proto_comp_failed:
704 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
705xfrm_proto_ah_failed:
706 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
707xfrm_proto_esp_failed:
708 unregister_pernet_device(&vti_net_ops);
709pernet_dev_failed:
710 pr_err("vti init: failed to register %s\n", msg);
711 return err;
712}
713
714static void __exit vti_fini(void)
715{
716 rtnl_link_unregister(&vti_link_ops);
717 xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
718 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
719 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
720 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
721 unregister_pernet_device(&vti_net_ops);
722}
723
724module_init(vti_init);
725module_exit(vti_fini);
726MODULE_LICENSE("GPL");
727MODULE_ALIAS_RTNL_LINK("vti");
728MODULE_ALIAS_NETDEV("ip_vti0");