ip_vti.c

  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(dst);
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_dev(skb);
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_rtnl(struct net *net,
527				     struct list_head *dev_to_kill)
528{
529	ip_tunnel_delete_net(net, vti_net_id, &vti_link_ops, dev_to_kill);
530}
531
532static struct pernet_operations vti_net_ops = {
533	.init = vti_init_net,
534	.exit_rtnl = vti_exit_rtnl,
535	.id   = &vti_net_id,
536	.size = sizeof(struct ip_tunnel_net),
537};
538
539static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
540			       struct netlink_ext_ack *extack)
541{
542	return 0;
543}
544
545static void vti_netlink_parms(struct nlattr *data[],
546			      struct ip_tunnel_parm_kern *parms,
547			      __u32 *fwmark)
548{
549	memset(parms, 0, sizeof(*parms));
550
551	parms->iph.protocol = IPPROTO_IPIP;
552
553	if (!data)
554		return;
555
556	__set_bit(IP_TUNNEL_VTI_BIT, parms->i_flags);
557
558	if (data[IFLA_VTI_LINK])
559		parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
560
561	if (data[IFLA_VTI_IKEY])
562		parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
563
564	if (data[IFLA_VTI_OKEY])
565		parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
566
567	if (data[IFLA_VTI_LOCAL])
568		parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
569
570	if (data[IFLA_VTI_REMOTE])
571		parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
572
573	if (data[IFLA_VTI_FWMARK])
574		*fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
575}
576
577static int vti_newlink(struct net_device *dev,
578		       struct rtnl_newlink_params *params,
579		       struct netlink_ext_ack *extack)
580{
581	struct nlattr **data = params->data;
582	struct ip_tunnel_parm_kern parms;
583	struct nlattr **tb = params->tb;
584	__u32 fwmark = 0;
585
586	vti_netlink_parms(data, &parms, &fwmark);
587	return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb,
588				 &parms, fwmark);
589}
590
591static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
592			  struct nlattr *data[],
593			  struct netlink_ext_ack *extack)
594{
595	struct ip_tunnel *t = netdev_priv(dev);
596	struct ip_tunnel_parm_kern p;
597	__u32 fwmark = t->fwmark;
598
599	vti_netlink_parms(data, &p, &fwmark);
600	return ip_tunnel_changelink(dev, tb, &p, fwmark);
601}
602
603static size_t vti_get_size(const struct net_device *dev)
604{
605	return
606		/* IFLA_VTI_LINK */
607		nla_total_size(4) +
608		/* IFLA_VTI_IKEY */
609		nla_total_size(4) +
610		/* IFLA_VTI_OKEY */
611		nla_total_size(4) +
612		/* IFLA_VTI_LOCAL */
613		nla_total_size(4) +
614		/* IFLA_VTI_REMOTE */
615		nla_total_size(4) +
616		/* IFLA_VTI_FWMARK */
617		nla_total_size(4) +
618		0;
619}
620
621static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
622{
623	struct ip_tunnel *t = netdev_priv(dev);
624	struct ip_tunnel_parm_kern *p = &t->parms;
625
626	if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) ||
627	    nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) ||
628	    nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) ||
629	    nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
630	    nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
631	    nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
632		return -EMSGSIZE;
633
634	return 0;
635}
636
637static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
638	[IFLA_VTI_LINK]		= { .type = NLA_U32 },
639	[IFLA_VTI_IKEY]		= { .type = NLA_U32 },
640	[IFLA_VTI_OKEY]		= { .type = NLA_U32 },
641	[IFLA_VTI_LOCAL]	= { .len = sizeof_field(struct iphdr, saddr) },
642	[IFLA_VTI_REMOTE]	= { .len = sizeof_field(struct iphdr, daddr) },
643	[IFLA_VTI_FWMARK]	= { .type = NLA_U32 },
644};
645
646static struct rtnl_link_ops vti_link_ops __read_mostly = {
647	.kind		= "vti",
648	.maxtype	= IFLA_VTI_MAX,
649	.policy		= vti_policy,
650	.priv_size	= sizeof(struct ip_tunnel),
651	.setup		= vti_tunnel_setup,
652	.validate	= vti_tunnel_validate,
653	.newlink	= vti_newlink,
654	.changelink	= vti_changelink,
655	.dellink        = ip_tunnel_dellink,
656	.get_size	= vti_get_size,
657	.fill_info	= vti_fill_info,
658	.get_link_net	= ip_tunnel_get_link_net,
659};
660
661static int __init vti_init(void)
662{
663	const char *msg;
664	int err;
665
666	pr_info("IPv4 over IPsec tunneling driver\n");
667
668	msg = "tunnel device";
669	err = register_pernet_device(&vti_net_ops);
670	if (err < 0)
671		goto pernet_dev_failed;
672
673	msg = "tunnel protocols";
674	err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
675	if (err < 0)
676		goto xfrm_proto_esp_failed;
677	err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
678	if (err < 0)
679		goto xfrm_proto_ah_failed;
680	err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
681	if (err < 0)
682		goto xfrm_proto_comp_failed;
683
684#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
685	msg = "ipip tunnel";
686	err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET);
687	if (err < 0)
688		goto xfrm_tunnel_ipip_failed;
689#if IS_ENABLED(CONFIG_IPV6)
690	err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6);
691	if (err < 0)
692		goto xfrm_tunnel_ipip6_failed;
693#endif
694#endif
695
696	msg = "netlink interface";
697	err = rtnl_link_register(&vti_link_ops);
698	if (err < 0)
699		goto rtnl_link_failed;
700
701	return err;
702
703rtnl_link_failed:
704#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
705#if IS_ENABLED(CONFIG_IPV6)
706	xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
707xfrm_tunnel_ipip6_failed:
708#endif
709	xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
710xfrm_tunnel_ipip_failed:
711#endif
712	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
713xfrm_proto_comp_failed:
714	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
715xfrm_proto_ah_failed:
716	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
717xfrm_proto_esp_failed:
718	unregister_pernet_device(&vti_net_ops);
719pernet_dev_failed:
720	pr_err("vti init: failed to register %s\n", msg);
721	return err;
722}
723
724static void __exit vti_fini(void)
725{
726	rtnl_link_unregister(&vti_link_ops);
727#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL)
728#if IS_ENABLED(CONFIG_IPV6)
729	xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6);
730#endif
731	xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET);
732#endif
733	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
734	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
735	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
736	unregister_pernet_device(&vti_net_ops);
737}
738
739module_init(vti_init);
740module_exit(vti_fini);
741MODULE_DESCRIPTION("Virtual (secure) IP tunneling library");
742MODULE_LICENSE("GPL");
743MODULE_ALIAS_RTNL_LINK("vti");
744MODULE_ALIAS_NETDEV("ip_vti0");