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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux NET3: IP/IP protocol decoder modified to support
4 * virtual tunnel interface
5 *
6 * Authors:
7 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012
8 */
9
10/*
11 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c
12
13 For comments look at net/ipv4/ip_gre.c --ANK
14 */
15
16
17#include <linux/capability.h>
18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/kernel.h>
21#include <linux/uaccess.h>
22#include <linux/skbuff.h>
23#include <linux/netdevice.h>
24#include <linux/in.h>
25#include <linux/tcp.h>
26#include <linux/udp.h>
27#include <linux/if_arp.h>
28#include <linux/init.h>
29#include <linux/netfilter_ipv4.h>
30#include <linux/if_ether.h>
31#include <linux/icmpv6.h>
32
33#include <net/sock.h>
34#include <net/ip.h>
35#include <net/icmp.h>
36#include <net/ip_tunnels.h>
37#include <net/inet_ecn.h>
38#include <net/xfrm.h>
39#include <net/net_namespace.h>
40#include <net/netns/generic.h>
41
42static struct rtnl_link_ops vti_link_ops __read_mostly;
43
44static unsigned int vti_net_id __read_mostly;
45static int vti_tunnel_init(struct net_device *dev);
46
47static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
48 int encap_type, bool update_skb_dev)
49{
50 struct ip_tunnel *tunnel;
51 const struct iphdr *iph = ip_hdr(skb);
52 struct net *net = dev_net(skb->dev);
53 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
54 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
55
56 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags);
57
58 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags,
59 iph->saddr, iph->daddr, 0);
60 if (tunnel) {
61 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
62 goto drop;
63
64 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
65
66 if (update_skb_dev)
67 skb->dev = tunnel->dev;
68
69 return xfrm_input(skb, nexthdr, spi, encap_type);
70 }
71
72 return -EINVAL;
73drop:
74 kfree_skb(skb);
75 return 0;
76}
77
78static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi,
79 int encap_type)
80{
81 return vti_input(skb, nexthdr, spi, encap_type, false);
82}
83
84static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev)
85{
86 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
87 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
88
89 return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev);
90}
91
92static int vti_rcv_proto(struct sk_buff *skb)
93{
94 return vti_rcv(skb, 0, false);
95}
96
97static int vti_rcv_cb(struct sk_buff *skb, int err)
98{
99 unsigned short family;
100 struct net_device *dev;
101 struct xfrm_state *x;
102 const struct xfrm_mode *inner_mode;
103 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
104 u32 orig_mark = skb->mark;
105 int ret;
106
107 if (!tunnel)
108 return 1;
109
110 dev = tunnel->dev;
111
112 if (err) {
113 DEV_STATS_INC(dev, rx_errors);
114 DEV_STATS_INC(dev, rx_dropped);
115
116 return 0;
117 }
118
119 x = xfrm_input_state(skb);
120
121 inner_mode = &x->inner_mode;
122
123 if (x->sel.family == AF_UNSPEC) {
124 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
125 if (inner_mode == NULL) {
126 XFRM_INC_STATS(dev_net(skb->dev),
127 LINUX_MIB_XFRMINSTATEMODEERROR);
128 return -EINVAL;
129 }
130 }
131
132 family = inner_mode->family;
133
134 skb->mark = be32_to_cpu(tunnel->parms.i_key);
135 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
136 skb->mark = orig_mark;
137
138 if (!ret)
139 return -EPERM;
140
141 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
142 skb->dev = dev;
143 dev_sw_netstats_rx_add(dev, skb->len);
144
145 return 0;
146}
147
148static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
149{
150 xfrm_address_t *daddr = (xfrm_address_t *)&dst;
151 xfrm_address_t *saddr = (xfrm_address_t *)&src;
152
153 /* if there is no transform then this tunnel is not functional.
154 * Or if the xfrm is not mode tunnel.
155 */
156 if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
157 x->props.family != AF_INET)
158 return false;
159
160 if (!dst)
161 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
162
163 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
164 return false;
165
166 return true;
167}
168
169static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
170 struct flowi *fl)
171{
172 struct ip_tunnel *tunnel = netdev_priv(dev);
173 struct ip_tunnel_parm_kern *parms = &tunnel->parms;
174 struct dst_entry *dst = skb_dst(skb);
175 struct net_device *tdev; /* Device to other host */
176 int pkt_len = skb->len;
177 int err;
178 int mtu;
179
180 if (!dst) {
181 switch (skb->protocol) {
182 case htons(ETH_P_IP): {
183 struct rtable *rt;
184
185 fl->u.ip4.flowi4_oif = dev->ifindex;
186 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
187 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
188 if (IS_ERR(rt)) {
189 DEV_STATS_INC(dev, tx_carrier_errors);
190 goto tx_error_icmp;
191 }
192 dst = &rt->dst;
193 skb_dst_set(skb, dst);
194 break;
195 }
196#if IS_ENABLED(CONFIG_IPV6)
197 case htons(ETH_P_IPV6):
198 fl->u.ip6.flowi6_oif = dev->ifindex;
199 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
200 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
201 if (dst->error) {
202 dst_release(dst);
203 dst = NULL;
204 DEV_STATS_INC(dev, tx_carrier_errors);
205 goto tx_error_icmp;
206 }
207 skb_dst_set(skb, dst);
208 break;
209#endif
210 default:
211 DEV_STATS_INC(dev, tx_carrier_errors);
212 goto tx_error_icmp;
213 }
214 }
215
216 dst_hold(dst);
217 dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0);
218 if (IS_ERR(dst)) {
219 DEV_STATS_INC(dev, tx_carrier_errors);
220 goto tx_error_icmp;
221 }
222
223 if (dst->flags & DST_XFRM_QUEUE)
224 goto xmit;
225
226 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
227 DEV_STATS_INC(dev, tx_carrier_errors);
228 dst_release(dst);
229 goto tx_error_icmp;
230 }
231
232 tdev = dst->dev;
233
234 if (tdev == dev) {
235 dst_release(dst);
236 DEV_STATS_INC(dev, collisions);
237 goto tx_error;
238 }
239
240 mtu = dst_mtu(dst);
241 if (skb->len > mtu) {
242 skb_dst_update_pmtu_no_confirm(skb, mtu);
243 if (skb->protocol == htons(ETH_P_IP)) {
244 if (!(ip_hdr(skb)->frag_off & htons(IP_DF)))
245 goto xmit;
246 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
247 htonl(mtu));
248 } else {
249 if (mtu < IPV6_MIN_MTU)
250 mtu = IPV6_MIN_MTU;
251
252 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
253 }
254
255 dst_release(dst);
256 goto tx_error;
257 }
258
259xmit:
260 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
261 skb_dst_set(skb, dst);
262 skb->dev = skb_dst(skb)->dev;
263
264 err = dst_output(tunnel->net, skb->sk, skb);
265 if (net_xmit_eval(err) == 0)
266 err = pkt_len;
267 iptunnel_xmit_stats(dev, err);
268 return NETDEV_TX_OK;
269
270tx_error_icmp:
271 dst_link_failure(skb);
272tx_error:
273 DEV_STATS_INC(dev, tx_errors);
274 kfree_skb(skb);
275 return NETDEV_TX_OK;
276}
277
278/* This function assumes it is being called from dev_queue_xmit()
279 * and that skb is filled properly by that function.
280 */
281static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
282{
283 struct ip_tunnel *tunnel = netdev_priv(dev);
284 struct flowi fl;
285
286 if (!pskb_inet_may_pull(skb))
287 goto tx_err;
288
289 memset(&fl, 0, sizeof(fl));
290
291 switch (skb->protocol) {
292 case htons(ETH_P_IP):
293 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
294 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET);
295 break;
296 case htons(ETH_P_IPV6):
297 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
298 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET6);
299 break;
300 default:
301 goto tx_err;
302 }
303
304 /* override mark with tunnel output key */
305 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
306
307 return vti_xmit(skb, dev, &fl);
308
309tx_err:
310 DEV_STATS_INC(dev, tx_errors);
311 kfree_skb(skb);
312 return NETDEV_TX_OK;
313}
314
315static int vti4_err(struct sk_buff *skb, u32 info)
316{
317 __be32 spi;
318 __u32 mark;
319 struct xfrm_state *x;
320 struct ip_tunnel *tunnel;
321 struct ip_esp_hdr *esph;
322 struct ip_auth_hdr *ah ;
323 struct ip_comp_hdr *ipch;
324 struct net *net = dev_net(skb->dev);
325 const struct iphdr *iph = (const struct iphdr *)skb->data;
326 int protocol = iph->protocol;
327 struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
328 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
329
330 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags);
331
332 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags,
333 iph->daddr, iph->saddr, 0);
334 if (!tunnel)
335 return -1;
336
337 mark = be32_to_cpu(tunnel->parms.o_key);
338
339 switch (protocol) {
340 case IPPROTO_ESP:
341 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
342 spi = esph->spi;
343 break;
344 case IPPROTO_AH:
345 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
346 spi = ah->spi;
347 break;
348 case IPPROTO_COMP:
349 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
350 spi = htonl(ntohs(ipch->cpi));
351 break;
352 default:
353 return 0;
354 }
355
356 switch (icmp_hdr(skb)->type) {
357 case ICMP_DEST_UNREACH:
358 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
359 return 0;
360 break;
361 case ICMP_REDIRECT:
362 break;
363 default:
364 return 0;
365 }
366
367 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
368 spi, protocol, AF_INET);
369 if (!x)
370 return 0;
371
372 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
373 ipv4_update_pmtu(skb, net, info, 0, protocol);
374 else
375 ipv4_redirect(skb, net, 0, protocol);
376 xfrm_state_put(x);
377
378 return 0;
379}
380
381static int
382vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd)
383{
384 IP_TUNNEL_DECLARE_FLAGS(flags) = { };
385 int err = 0;
386
387 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
388 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP ||
389 p->iph.ihl != 5)
390 return -EINVAL;
391 }
392
393 if (!ip_tunnel_flags_is_be16_compat(p->i_flags) ||
394 !ip_tunnel_flags_is_be16_compat(p->o_flags))
395 return -EOVERFLOW;
396
397 if (!(ip_tunnel_flags_to_be16(p->i_flags) & GRE_KEY))
398 p->i_key = 0;
399 if (!(ip_tunnel_flags_to_be16(p->o_flags) & GRE_KEY))
400 p->o_key = 0;
401
402 __set_bit(IP_TUNNEL_VTI_BIT, flags);
403 ip_tunnel_flags_copy(p->i_flags, flags);
404
405 err = ip_tunnel_ctl(dev, p, cmd);
406 if (err)
407 return err;
408
409 if (cmd != SIOCDELTUNNEL) {
410 ip_tunnel_flags_from_be16(flags, GRE_KEY);
411 ip_tunnel_flags_or(p->i_flags, p->i_flags, flags);
412 ip_tunnel_flags_or(p->o_flags, p->o_flags, flags);
413 }
414 return 0;
415}
416
417static const struct net_device_ops vti_netdev_ops = {
418 .ndo_init = vti_tunnel_init,
419 .ndo_uninit = ip_tunnel_uninit,
420 .ndo_start_xmit = vti_tunnel_xmit,
421 .ndo_siocdevprivate = ip_tunnel_siocdevprivate,
422 .ndo_change_mtu = ip_tunnel_change_mtu,
423 .ndo_get_stats64 = dev_get_tstats64,
424 .ndo_get_iflink = ip_tunnel_get_iflink,
425 .ndo_tunnel_ctl = vti_tunnel_ctl,
426};
427
428static void vti_tunnel_setup(struct net_device *dev)
429{
430 dev->netdev_ops = &vti_netdev_ops;
431 dev->header_ops = &ip_tunnel_header_ops;
432 dev->type = ARPHRD_TUNNEL;
433 ip_tunnel_setup(dev, vti_net_id);
434}
435
436static int vti_tunnel_init(struct net_device *dev)
437{
438 struct ip_tunnel *tunnel = netdev_priv(dev);
439 struct iphdr *iph = &tunnel->parms.iph;
440
441 __dev_addr_set(dev, &iph->saddr, 4);
442 memcpy(dev->broadcast, &iph->daddr, 4);
443
444 dev->flags = IFF_NOARP;
445 dev->addr_len = 4;
446 dev->lltx = true;
447 netif_keep_dst(dev);
448
449 return ip_tunnel_init(dev);
450}
451
452static void __net_init vti_fb_tunnel_init(struct net_device *dev)
453{
454 struct ip_tunnel *tunnel = netdev_priv(dev);
455 struct iphdr *iph = &tunnel->parms.iph;
456
457 iph->version = 4;
458 iph->protocol = IPPROTO_IPIP;
459 iph->ihl = 5;
460}
461
462static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
463 .handler = vti_rcv_proto,
464 .input_handler = vti_input_proto,
465 .cb_handler = vti_rcv_cb,
466 .err_handler = vti4_err,
467 .priority = 100,
468};
469
470static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
471 .handler = vti_rcv_proto,
472 .input_handler = vti_input_proto,
473 .cb_handler = vti_rcv_cb,
474 .err_handler = vti4_err,
475 .priority = 100,
476};
477
478static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
479 .handler = vti_rcv_proto,
480 .input_handler = vti_input_proto,
481 .cb_handler = vti_rcv_cb,
482 .err_handler = vti4_err,
483 .priority = 100,
484};
485
486#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
487static int vti_rcv_tunnel(struct sk_buff *skb)
488{
489 XFRM_SPI_SKB_CB(skb)->family = AF_INET;
490 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
491
492 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false);
493}
494
495static struct xfrm_tunnel vti_ipip_handler __read_mostly = {
496 .handler = vti_rcv_tunnel,
497 .cb_handler = vti_rcv_cb,
498 .err_handler = vti4_err,
499 .priority = 0,
500};
501
502#if IS_ENABLED(CONFIG_IPV6)
503static struct xfrm_tunnel vti_ipip6_handler __read_mostly = {
504 .handler = vti_rcv_tunnel,
505 .cb_handler = vti_rcv_cb,
506 .err_handler = vti4_err,
507 .priority = 0,
508};
509#endif
510#endif
511
512static int __net_init vti_init_net(struct net *net)
513{
514 int err;
515 struct ip_tunnel_net *itn;
516
517 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
518 if (err)
519 return err;
520 itn = net_generic(net, vti_net_id);
521 if (itn->fb_tunnel_dev)
522 vti_fb_tunnel_init(itn->fb_tunnel_dev);
523 return 0;
524}
525
526static void __net_exit vti_exit_batch_rtnl(struct list_head *list_net,
527 struct list_head *dev_to_kill)
528{
529 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops,
530 dev_to_kill);
531}
532
533static struct pernet_operations vti_net_ops = {
534 .init = vti_init_net,
535 .exit_batch_rtnl = vti_exit_batch_rtnl,
536 .id = &vti_net_id,
537 .size = sizeof(struct ip_tunnel_net),
538};
539
540static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
541 struct netlink_ext_ack *extack)
542{
543 return 0;
544}
545
546static void vti_netlink_parms(struct nlattr *data[],
547 struct ip_tunnel_parm_kern *parms,
548 __u32 *fwmark)
549{
550 memset(parms, 0, sizeof(*parms));
551
552 parms->iph.protocol = IPPROTO_IPIP;
553
554 if (!data)
555 return;
556
557 __set_bit(IP_TUNNEL_VTI_BIT, parms->i_flags);
558
559 if (data[IFLA_VTI_LINK])
560 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
561
562 if (data[IFLA_VTI_IKEY])
563 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
564
565 if (data[IFLA_VTI_OKEY])
566 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
567
568 if (data[IFLA_VTI_LOCAL])
569 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
570
571 if (data[IFLA_VTI_REMOTE])
572 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
573
574 if (data[IFLA_VTI_FWMARK])
575 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
576}
577
578static int vti_newlink(struct net *src_net, struct net_device *dev,
579 struct nlattr *tb[], struct nlattr *data[],
580 struct netlink_ext_ack *extack)
581{
582 struct ip_tunnel_parm_kern parms;
583 __u32 fwmark = 0;
584
585 vti_netlink_parms(data, &parms, &fwmark);
586 return ip_tunnel_newlink(dev, tb, &parms, fwmark);
587}
588
589static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
590 struct nlattr *data[],
591 struct netlink_ext_ack *extack)
592{
593 struct ip_tunnel *t = netdev_priv(dev);
594 struct ip_tunnel_parm_kern p;
595 __u32 fwmark = t->fwmark;
596
597 vti_netlink_parms(data, &p, &fwmark);
598 return ip_tunnel_changelink(dev, tb, &p, fwmark);
599}
600
601static size_t vti_get_size(const struct net_device *dev)
602{
603 return
604 /* IFLA_VTI_LINK */
605 nla_total_size(4) +
606 /* IFLA_VTI_IKEY */
607 nla_total_size(4) +
608 /* IFLA_VTI_OKEY */
609 nla_total_size(4) +
610 /* IFLA_VTI_LOCAL */
611 nla_total_size(4) +
612 /* IFLA_VTI_REMOTE */
613 nla_total_size(4) +
614 /* IFLA_VTI_FWMARK */
615 nla_total_size(4) +
616 0;
617}
618
619static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
620{
621 struct ip_tunnel *t = netdev_priv(dev);
622 struct ip_tunnel_parm_kern *p = &t->parms;
623
624 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
625 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
626 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
627 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
628 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
629 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
630 return -EMSGSIZE;
631
632 return 0;
633}
634
635static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
636 [IFLA_VTI_LINK] = { .type = NLA_U32 },
637 [IFLA_VTI_IKEY] = { .type = NLA_U32 },
638 [IFLA_VTI_OKEY] = { .type = NLA_U32 },
639 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
640 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) },
641 [IFLA_VTI_FWMARK] = { .type = NLA_U32 },
642};
643
644static struct rtnl_link_ops vti_link_ops __read_mostly = {
645 .kind = "vti",
646 .maxtype = IFLA_VTI_MAX,
647 .policy = vti_policy,
648 .priv_size = sizeof(struct ip_tunnel),
649 .setup = vti_tunnel_setup,
650 .validate = vti_tunnel_validate,
651 .newlink = vti_newlink,
652 .changelink = vti_changelink,
653 .dellink = ip_tunnel_dellink,
654 .get_size = vti_get_size,
655 .fill_info = vti_fill_info,
656 .get_link_net = ip_tunnel_get_link_net,
657};
658
659static int __init vti_init(void)
660{
661 const char *msg;
662 int err;
663
664 pr_info("IPv4 over IPsec tunneling driver\n");
665
666 msg = "tunnel device";
667 err = register_pernet_device(&vti_net_ops);
668 if (err < 0)
669 goto pernet_dev_failed;
670
671 msg = "tunnel protocols";
672 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
673 if (err < 0)
674 goto xfrm_proto_esp_failed;
675 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
676 if (err < 0)
677 goto xfrm_proto_ah_failed;
678 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
679 if (err < 0)
680 goto xfrm_proto_comp_failed;
681
682#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
683 msg = "ipip tunnel";
684 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET);
685 if (err < 0)
686 goto xfrm_tunnel_ipip_failed;
687#if IS_ENABLED(CONFIG_IPV6)
688 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
689 if (err < 0)
690 goto xfrm_tunnel_ipip6_failed;
691#endif
692#endif
693
694 msg = "netlink interface";
695 err = rtnl_link_register(&vti_link_ops);
696 if (err < 0)
697 goto rtnl_link_failed;
698
699 return err;
700
701rtnl_link_failed:
702#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
703#if IS_ENABLED(CONFIG_IPV6)
704 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
705xfrm_tunnel_ipip6_failed:
706#endif
707 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
708xfrm_tunnel_ipip_failed:
709#endif
710 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
711xfrm_proto_comp_failed:
712 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
713xfrm_proto_ah_failed:
714 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
715xfrm_proto_esp_failed:
716 unregister_pernet_device(&vti_net_ops);
717pernet_dev_failed:
718 pr_err("vti init: failed to register %s\n", msg);
719 return err;
720}
721
722static void __exit vti_fini(void)
723{
724 rtnl_link_unregister(&vti_link_ops);
725#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
726#if IS_ENABLED(CONFIG_IPV6)
727 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
728#endif
729 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
730#endif
731 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
732 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
733 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
734 unregister_pernet_device(&vti_net_ops);
735}
736
737module_init(vti_init);
738module_exit(vti_fini);
739MODULE_DESCRIPTION("Virtual (secure) IP tunneling library");
740MODULE_LICENSE("GPL");
741MODULE_ALIAS_RTNL_LINK("vti");
742MODULE_ALIAS_NETDEV("ip_vti0");