[linux.git] / net / ipv4 / ip_vti.c

/*
 *	Linux NET3: IP/IP protocol decoder modified to support
 *		    virtual tunnel interface
 *
 *	Authors:
 *		Saurabh Mohan ([email protected]) 05/07/2012
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 */

/*
   This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c

   For comments look at net/ipv4/ip_gre.c --ANK
 */


#include <linux/capability.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/uaccess.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/if_arp.h>
#include <linux/mroute.h>
#include <linux/init.h>
#include <linux/netfilter_ipv4.h>
#include <linux/if_ether.h>

#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/ip_tunnels.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>

static struct rtnl_link_ops vti_link_ops __read_mostly;

static int vti_net_id __read_mostly;
static int vti_tunnel_init(struct net_device *dev);

/* We dont digest the packet therefore let the packet pass */
static int vti_rcv(struct sk_buff *skb)
{
	struct ip_tunnel *tunnel;
	const struct iphdr *iph = ip_hdr(skb);
	struct net *net = dev_net(skb->dev);
	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);

	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
				  iph->saddr, iph->daddr, 0);
	if (tunnel != NULL) {
		struct pcpu_tstats *tstats;
		u32 oldmark = skb->mark;
		int ret;


		/* temporarily mark the skb with the tunnel o_key, to
		 * only match policies with this mark.
		 */
		skb->mark = be32_to_cpu(tunnel->parms.o_key);
		ret = xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb);
		skb->mark = oldmark;
		if (!ret)
			return -1;

		tstats = this_cpu_ptr(tunnel->dev->tstats);
		u64_stats_update_begin(&tstats->syncp);
		tstats->rx_packets++;
		tstats->rx_bytes += skb->len;
		u64_stats_update_end(&tstats->syncp);

		secpath_reset(skb);
		skb->dev = tunnel->dev;
		return 1;
	}

	return -1;
}

/* This function assumes it is being called from dev_queue_xmit()
 * and that skb is filled properly by that function.
 */

static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct iphdr  *tiph = &tunnel->parms.iph;
	u8     tos;
	struct rtable *rt;		/* Route to the other host */
	struct net_device *tdev;	/* Device to other host */
	struct iphdr  *old_iph = ip_hdr(skb);
	__be32 dst = tiph->daddr;
	struct flowi4 fl4;
	int err;

	if (skb->protocol != htons(ETH_P_IP))
		goto tx_error;

	tos = old_iph->tos;

	memset(&fl4, 0, sizeof(fl4));
	flowi4_init_output(&fl4, tunnel->parms.link,
			   be32_to_cpu(tunnel->parms.o_key), RT_TOS(tos),
			   RT_SCOPE_UNIVERSE,
			   IPPROTO_IPIP, 0,
			   dst, tiph->saddr, 0, 0);
	rt = ip_route_output_key(dev_net(dev), &fl4);
	if (IS_ERR(rt)) {
		dev->stats.tx_carrier_errors++;
		goto tx_error_icmp;
	}
	/* if there is no transform then this tunnel is not functional.
	 * Or if the xfrm is not mode tunnel.
	 */
	if (!rt->dst.xfrm ||
	    rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
		dev->stats.tx_carrier_errors++;
		ip_rt_put(rt);
		goto tx_error_icmp;
	}
	tdev = rt->dst.dev;

	if (tdev == dev) {
		ip_rt_put(rt);
		dev->stats.collisions++;
		goto tx_error;
	}

	if (tunnel->err_count > 0) {
		if (time_before(jiffies,
				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
			tunnel->err_count--;
			dst_link_failure(skb);
		} else
			tunnel->err_count = 0;
	}

	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	skb_dst_drop(skb);
	skb_dst_set(skb, &rt->dst);
	nf_reset(skb);
	skb->dev = skb_dst(skb)->dev;

	err = dst_output(skb);
	if (net_xmit_eval(err) == 0)
		err = skb->len;
	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
	return NETDEV_TX_OK;

tx_error_icmp:
	dst_link_failure(skb);
tx_error:
	dev->stats.tx_errors++;
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static int
vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip_tunnel_parm p;

	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
		return -EFAULT;

	if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
		    p.iph.ihl != 5)
			return -EINVAL;
	}

	err = ip_tunnel_ioctl(dev, &p, cmd);
	if (err)
		return err;

	if (cmd != SIOCDELTUNNEL) {
		p.i_flags |= GRE_KEY | VTI_ISVTI;
		p.o_flags |= GRE_KEY;
	}

	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
		return -EFAULT;
	return 0;
}

static const struct net_device_ops vti_netdev_ops = {
	.ndo_init	= vti_tunnel_init,
	.ndo_uninit	= ip_tunnel_uninit,
	.ndo_start_xmit	= vti_tunnel_xmit,
	.ndo_do_ioctl	= vti_tunnel_ioctl,
	.ndo_change_mtu	= ip_tunnel_change_mtu,
	.ndo_get_stats64 = ip_tunnel_get_stats64,
};

static void vti_tunnel_setup(struct net_device *dev)
{
	dev->netdev_ops		= &vti_netdev_ops;
	ip_tunnel_setup(dev, vti_net_id);
}

static int vti_tunnel_init(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct iphdr *iph = &tunnel->parms.iph;

	memcpy(dev->dev_addr, &iph->saddr, 4);
	memcpy(dev->broadcast, &iph->daddr, 4);

	dev->type		= ARPHRD_TUNNEL;
	dev->hard_header_len	= LL_MAX_HEADER + sizeof(struct iphdr);
	dev->mtu		= ETH_DATA_LEN;
	dev->flags		= IFF_NOARP;
	dev->iflink		= 0;
	dev->addr_len		= 4;
	dev->features		|= NETIF_F_NETNS_LOCAL;
	dev->features		|= NETIF_F_LLTX;
	dev->priv_flags		&= ~IFF_XMIT_DST_RELEASE;

	return ip_tunnel_init(dev);
}

static void __net_init vti_fb_tunnel_init(struct net_device *dev)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct iphdr *iph = &tunnel->parms.iph;

	iph->version		= 4;
	iph->protocol		= IPPROTO_IPIP;
	iph->ihl		= 5;
}

static struct xfrm_tunnel_notifier vti_handler __read_mostly = {
	.handler	=	vti_rcv,
	.priority	=	1,
};

static int __net_init vti_init_net(struct net *net)
{
	int err;
	struct ip_tunnel_net *itn;

	err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
	if (err)
		return err;
	itn = net_generic(net, vti_net_id);
	vti_fb_tunnel_init(itn->fb_tunnel_dev);
	return 0;
}

static void __net_exit vti_exit_net(struct net *net)
{
	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
	ip_tunnel_delete_net(itn, &vti_link_ops);
}

static struct pernet_operations vti_net_ops = {
	.init = vti_init_net,
	.exit = vti_exit_net,
	.id   = &vti_net_id,
	.size = sizeof(struct ip_tunnel_net),
};

static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
{
	return 0;
}

static void vti_netlink_parms(struct nlattr *data[],
			      struct ip_tunnel_parm *parms)
{
	memset(parms, 0, sizeof(*parms));

	parms->iph.protocol = IPPROTO_IPIP;

	if (!data)
		return;

	if (data[IFLA_VTI_LINK])
		parms->link = nla_get_u32(data[IFLA_VTI_LINK]);

	if (data[IFLA_VTI_IKEY])
		parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);

	if (data[IFLA_VTI_OKEY])
		parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);

	if (data[IFLA_VTI_LOCAL])
		parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);

	if (data[IFLA_VTI_REMOTE])
		parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);

}

static int vti_newlink(struct net *src_net, struct net_device *dev,
		       struct nlattr *tb[], struct nlattr *data[])
{
	struct ip_tunnel_parm parms;

	vti_netlink_parms(data, &parms);
	return ip_tunnel_newlink(dev, tb, &parms);
}

static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
			  struct nlattr *data[])
{
	struct ip_tunnel_parm p;

	vti_netlink_parms(data, &p);
	return ip_tunnel_changelink(dev, tb, &p);
}

static size_t vti_get_size(const struct net_device *dev)
{
	return
		/* IFLA_VTI_LINK */
		nla_total_size(4) +
		/* IFLA_VTI_IKEY */
		nla_total_size(4) +
		/* IFLA_VTI_OKEY */
		nla_total_size(4) +
		/* IFLA_VTI_LOCAL */
		nla_total_size(4) +
		/* IFLA_VTI_REMOTE */
		nla_total_size(4) +
		0;
}

static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct ip_tunnel *t = netdev_priv(dev);
	struct ip_tunnel_parm *p = &t->parms;

	nla_put_u32(skb, IFLA_VTI_LINK, p->link);
	nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
	nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
	nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
	nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);

	return 0;
}

static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
	[IFLA_VTI_LINK]		= { .type = NLA_U32 },
	[IFLA_VTI_IKEY]		= { .type = NLA_U32 },
	[IFLA_VTI_OKEY]		= { .type = NLA_U32 },
	[IFLA_VTI_LOCAL]	= { .len = FIELD_SIZEOF(struct iphdr, saddr) },
	[IFLA_VTI_REMOTE]	= { .len = FIELD_SIZEOF(struct iphdr, daddr) },
};

static struct rtnl_link_ops vti_link_ops __read_mostly = {
	.kind		= "vti",
	.maxtype	= IFLA_VTI_MAX,
	.policy		= vti_policy,
	.priv_size	= sizeof(struct ip_tunnel),
	.setup		= vti_tunnel_setup,
	.validate	= vti_tunnel_validate,
	.newlink	= vti_newlink,
	.changelink	= vti_changelink,
	.get_size	= vti_get_size,
	.fill_info	= vti_fill_info,
};

static int __init vti_init(void)
{
	int err;

	pr_info("IPv4 over IPSec tunneling driver\n");

	err = register_pernet_device(&vti_net_ops);
	if (err < 0)
		return err;
	err = xfrm4_mode_tunnel_input_register(&vti_handler);
	if (err < 0) {
		unregister_pernet_device(&vti_net_ops);
		pr_info("vti init: can't register tunnel\n");
	}

	err = rtnl_link_register(&vti_link_ops);
	if (err < 0)
		goto rtnl_link_failed;

	return err;

rtnl_link_failed:
	xfrm4_mode_tunnel_input_deregister(&vti_handler);
	unregister_pernet_device(&vti_net_ops);
	return err;
}

static void __exit vti_fini(void)
{
	rtnl_link_unregister(&vti_link_ops);
	if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
		pr_info("vti close: can't deregister tunnel\n");

	unregister_pernet_device(&vti_net_ops);
}

module_init(vti_init);
module_exit(vti_fini);
MODULE_LICENSE("GPL");
MODULE_ALIAS_RTNL_LINK("vti");
MODULE_ALIAS_NETDEV("ip_vti0");
Commit	Line	Data
1181412c S	1	/*
	2	* Linux NET3: IP/IP protocol decoder modified to support
	3	* virtual tunnel interface
	4	*
	5	* Authors:
	6	* Saurabh Mohan ([email protected]) 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/mroute.h>
	34	#include <linux/init.h>
	35	#include <linux/netfilter_ipv4.h>
	36	#include <linux/if_ether.h>
	37
	38	#include <net/sock.h>
	39	#include <net/ip.h>
	40	#include <net/icmp.h>
c5441932	41	#include <net/ip_tunnels.h>
1181412c S	42	#include <net/inet_ecn.h>
	43	#include <net/xfrm.h>
	44	#include <net/net_namespace.h>
	45	#include <net/netns/generic.h>
	46
1181412c S	47	static struct rtnl_link_ops vti_link_ops __read_mostly;
	48
	49	static int vti_net_id __read_mostly;
1181412c	50	static int vti_tunnel_init(struct net_device *dev);
1181412c	51
1181412c S	52	/* We dont digest the packet therefore let the packet pass */
	53	static int vti_rcv(struct sk_buff *skb)
	54	{
	55	struct ip_tunnel *tunnel;
	56	const struct iphdr *iph = ip_hdr(skb);
b9959fd3 AW	57	struct net *net = dev_net(skb->dev);
b9959fd3 AW	58	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
1181412c	59
b9959fd3 AW	60	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
b9959fd3 AW	61	iph->saddr, iph->daddr, 0);
1181412c S	62	if (tunnel != NULL) {
1181412c S	63	struct pcpu_tstats *tstats;
7263a518 CG	64	u32 oldmark = skb->mark;
7263a518 CG	65	int ret;
1181412c	66
7263a518 CG	67
	68	/* temporarily mark the skb with the tunnel o_key, to
	69	* only match policies with this mark.
	70	*/
	71	skb->mark = be32_to_cpu(tunnel->parms.o_key);
	72	ret = xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb);
	73	skb->mark = oldmark;
	74	if (!ret)
b2942004 SM	75	return -1;
b2942004 SM	76
1181412c S	77	tstats = this_cpu_ptr(tunnel->dev->tstats);
	78	u64_stats_update_begin(&tstats->syncp);
	79	tstats->rx_packets++;
	80	tstats->rx_bytes += skb->len;
	81	u64_stats_update_end(&tstats->syncp);
	82
b2942004	83	secpath_reset(skb);
1181412c	84	skb->dev = tunnel->dev;
1181412c S	85	return 1;
1181412c S	86	}
1181412c S	87
	88	return -1;
	89	}
	90
	91	/* This function assumes it is being called from dev_queue_xmit()
	92	* and that skb is filled properly by that function.
	93	*/
	94
	95	static netdev_tx_t vti_tunnel_xmit(struct sk_buff skb, struct net_device dev)
	96	{
	97	struct ip_tunnel *tunnel = netdev_priv(dev);
1181412c S	98	struct iphdr *tiph = &tunnel->parms.iph;
	99	u8 tos;
	100	struct rtable rt; / Route to the other host */
	101	struct net_device tdev; / Device to other host */
	102	struct iphdr *old_iph = ip_hdr(skb);
	103	__be32 dst = tiph->daddr;
	104	struct flowi4 fl4;
b9959fd3	105	int err;
1181412c S	106
	107	if (skb->protocol != htons(ETH_P_IP))
	108	goto tx_error;
	109
	110	tos = old_iph->tos;
	111
	112	memset(&fl4, 0, sizeof(fl4));
	113	flowi4_init_output(&fl4, tunnel->parms.link,
7263a518	114	be32_to_cpu(tunnel->parms.o_key), RT_TOS(tos),
1181412c S	115	RT_SCOPE_UNIVERSE,
	116	IPPROTO_IPIP, 0,
	117	dst, tiph->saddr, 0, 0);
	118	rt = ip_route_output_key(dev_net(dev), &fl4);
	119	if (IS_ERR(rt)) {
	120	dev->stats.tx_carrier_errors++;
	121	goto tx_error_icmp;
	122	}
	123	/* if there is no transform then this tunnel is not functional.
	124	* Or if the xfrm is not mode tunnel.
	125	*/
	126	if (!rt->dst.xfrm \|\|
	127	rt->dst.xfrm->props.mode != XFRM_MODE_TUNNEL) {
	128	dev->stats.tx_carrier_errors++;
236c9f84	129	ip_rt_put(rt);
1181412c S	130	goto tx_error_icmp;
	131	}
	132	tdev = rt->dst.dev;
	133
	134	if (tdev == dev) {
	135	ip_rt_put(rt);
	136	dev->stats.collisions++;
	137	goto tx_error;
	138	}
	139
	140	if (tunnel->err_count > 0) {
	141	if (time_before(jiffies,
	142	tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
	143	tunnel->err_count--;
	144	dst_link_failure(skb);
	145	} else
	146	tunnel->err_count = 0;
	147	}
	148
baafc77b	149	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
1181412c S	150	skb_dst_drop(skb);
	151	skb_dst_set(skb, &rt->dst);
	152	nf_reset(skb);
	153	skb->dev = skb_dst(skb)->dev;
	154
b9959fd3 AW	155	err = dst_output(skb);
	156	if (net_xmit_eval(err) == 0)
	157	err = skb->len;
	158	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
1181412c S	159	return NETDEV_TX_OK;
	160
	161	tx_error_icmp:
	162	dst_link_failure(skb);
	163	tx_error:
	164	dev->stats.tx_errors++;
	165	dev_kfree_skb(skb);
	166	return NETDEV_TX_OK;
	167	}
	168
1181412c S	169	static int
	170	vti_tunnel_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	171	{
	172	int err = 0;
	173	struct ip_tunnel_parm p;
1181412c	174
b9959fd3 AW	175	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
b9959fd3 AW	176	return -EFAULT;
1181412c	177
b9959fd3	178	if (cmd == SIOCADDTUNNEL \|\| cmd == SIOCCHGTUNNEL) {
1181412c S	179	if (p.iph.version != 4 \|\| p.iph.protocol != IPPROTO_IPIP \|\|
1181412c S	180	p.iph.ihl != 5)
b9959fd3 AW	181	return -EINVAL;
b9959fd3 AW	182	}
1181412c	183
b9959fd3 AW	184	err = ip_tunnel_ioctl(dev, &p, cmd);
	185	if (err)
	186	return err;
1181412c	187
b9959fd3 AW	188	if (cmd != SIOCDELTUNNEL) {
	189	p.i_flags \|= GRE_KEY \| VTI_ISVTI;
	190	p.o_flags \|= GRE_KEY;
1181412c S	191	}
1181412c S	192
b9959fd3 AW	193	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
b9959fd3 AW	194	return -EFAULT;
1181412c S	195	return 0;
	196	}
	197
	198	static const struct net_device_ops vti_netdev_ops = {
	199	.ndo_init = vti_tunnel_init,
b9959fd3	200	.ndo_uninit = ip_tunnel_uninit,
1181412c S	201	.ndo_start_xmit = vti_tunnel_xmit,
1181412c S	202	.ndo_do_ioctl = vti_tunnel_ioctl,
b9959fd3	203	.ndo_change_mtu = ip_tunnel_change_mtu,
f61dd388	204	.ndo_get_stats64 = ip_tunnel_get_stats64,
1181412c S	205	};
1181412c S	206
b9959fd3	207	static void vti_tunnel_setup(struct net_device *dev)
1181412c	208	{
b9959fd3 AW	209	dev->netdev_ops = &vti_netdev_ops;
b9959fd3 AW	210	ip_tunnel_setup(dev, vti_net_id);
1181412c S	211	}
1181412c S	212
b9959fd3	213	static int vti_tunnel_init(struct net_device *dev)
1181412c	214	{
b9959fd3 AW	215	struct ip_tunnel *tunnel = netdev_priv(dev);
	216	struct iphdr *iph = &tunnel->parms.iph;
	217
	218	memcpy(dev->dev_addr, &iph->saddr, 4);
	219	memcpy(dev->broadcast, &iph->daddr, 4);
1181412c S	220
	221	dev->type = ARPHRD_TUNNEL;
	222	dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
	223	dev->mtu = ETH_DATA_LEN;
	224	dev->flags = IFF_NOARP;
	225	dev->iflink = 0;
	226	dev->addr_len = 4;
	227	dev->features \|= NETIF_F_NETNS_LOCAL;
	228	dev->features \|= NETIF_F_LLTX;
	229	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1181412c	230
b9959fd3	231	return ip_tunnel_init(dev);
1181412c S	232	}
1181412c S	233
b9959fd3	234	static void __net_init vti_fb_tunnel_init(struct net_device *dev)
1181412c S	235	{
	236	struct ip_tunnel *tunnel = netdev_priv(dev);
	237	struct iphdr *iph = &tunnel->parms.iph;
1181412c	238
1181412c S	239	iph->version = 4;
	240	iph->protocol = IPPROTO_IPIP;
	241	iph->ihl = 5;
1181412c S	242	}
1181412c S	243
aba82695	244	static struct xfrm_tunnel_notifier vti_handler __read_mostly = {
1181412c	245	.handler = vti_rcv,
1181412c S	246	.priority = 1,
	247	};
	248
1181412c S	249	static int __net_init vti_init_net(struct net *net)
	250	{
	251	int err;
b9959fd3	252	struct ip_tunnel_net *itn;
1181412c	253
b9959fd3	254	err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
1181412c	255	if (err)
b9959fd3 AW	256	return err;
	257	itn = net_generic(net, vti_net_id);
	258	vti_fb_tunnel_init(itn->fb_tunnel_dev);
1181412c	259	return 0;
1181412c S	260	}
	261
	262	static void __net_exit vti_exit_net(struct net *net)
	263	{
b9959fd3	264	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
6c742e71	265	ip_tunnel_delete_net(itn, &vti_link_ops);
1181412c S	266	}
	267
	268	static struct pernet_operations vti_net_ops = {
	269	.init = vti_init_net,
	270	.exit = vti_exit_net,
	271	.id = &vti_net_id,
b9959fd3	272	.size = sizeof(struct ip_tunnel_net),
1181412c S	273	};
	274
	275	static int vti_tunnel_validate(struct nlattr tb[], struct nlattr data[])
	276	{
	277	return 0;
	278	}
	279
	280	static void vti_netlink_parms(struct nlattr *data[],
	281	struct ip_tunnel_parm *parms)
	282	{
	283	memset(parms, 0, sizeof(*parms));
	284
	285	parms->iph.protocol = IPPROTO_IPIP;
	286
	287	if (!data)
	288	return;
	289
	290	if (data[IFLA_VTI_LINK])
	291	parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
	292
	293	if (data[IFLA_VTI_IKEY])
	294	parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
	295
	296	if (data[IFLA_VTI_OKEY])
	297	parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
	298
	299	if (data[IFLA_VTI_LOCAL])
	300	parms->iph.saddr = nla_get_be32(data[IFLA_VTI_LOCAL]);
	301
	302	if (data[IFLA_VTI_REMOTE])
	303	parms->iph.daddr = nla_get_be32(data[IFLA_VTI_REMOTE]);
	304
	305	}
	306
	307	static int vti_newlink(struct net src_net, struct net_device dev,
	308	struct nlattr tb[], struct nlattr data[])
	309	{
b9959fd3	310	struct ip_tunnel_parm parms;
1181412c	311
b9959fd3 AW	312	vti_netlink_parms(data, &parms);
b9959fd3 AW	313	return ip_tunnel_newlink(dev, tb, &parms);
1181412c S	314	}
	315
	316	static int vti_changelink(struct net_device dev, struct nlattr tb[],
	317	struct nlattr *data[])
	318	{
1181412c	319	struct ip_tunnel_parm p;
1181412c	320
1181412c	321	vti_netlink_parms(data, &p);
b9959fd3	322	return ip_tunnel_changelink(dev, tb, &p);
1181412c S	323	}
	324
	325	static size_t vti_get_size(const struct net_device *dev)
	326	{
	327	return
	328	/* IFLA_VTI_LINK */
	329	nla_total_size(4) +
	330	/* IFLA_VTI_IKEY */
	331	nla_total_size(4) +
	332	/* IFLA_VTI_OKEY */
	333	nla_total_size(4) +
	334	/* IFLA_VTI_LOCAL */
	335	nla_total_size(4) +
	336	/* IFLA_VTI_REMOTE */
	337	nla_total_size(4) +
	338	0;
	339	}
	340
	341	static int vti_fill_info(struct sk_buff skb, const struct net_device dev)
	342	{
	343	struct ip_tunnel *t = netdev_priv(dev);
	344	struct ip_tunnel_parm *p = &t->parms;
	345
	346	nla_put_u32(skb, IFLA_VTI_LINK, p->link);
	347	nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key);
	348	nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key);
	349	nla_put_be32(skb, IFLA_VTI_LOCAL, p->iph.saddr);
	350	nla_put_be32(skb, IFLA_VTI_REMOTE, p->iph.daddr);
	351
	352	return 0;
	353	}
	354
	355	static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
	356	[IFLA_VTI_LINK] = { .type = NLA_U32 },
	357	[IFLA_VTI_IKEY] = { .type = NLA_U32 },
	358	[IFLA_VTI_OKEY] = { .type = NLA_U32 },
	359	[IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
	360	[IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
	361	};
	362
	363	static struct rtnl_link_ops vti_link_ops __read_mostly = {
	364	.kind = "vti",
	365	.maxtype = IFLA_VTI_MAX,
	366	.policy = vti_policy,
	367	.priv_size = sizeof(struct ip_tunnel),
	368	.setup = vti_tunnel_setup,
	369	.validate = vti_tunnel_validate,
	370	.newlink = vti_newlink,
	371	.changelink = vti_changelink,
	372	.get_size = vti_get_size,
	373	.fill_info = vti_fill_info,
	374	};
	375
	376	static int __init vti_init(void)
	377	{
	378	int err;
	379
	380	pr_info("IPv4 over IPSec tunneling driver\n");
	381
	382	err = register_pernet_device(&vti_net_ops);
	383	if (err < 0)
	384	return err;
	385	err = xfrm4_mode_tunnel_input_register(&vti_handler);
	386	if (err < 0) {
387	unregister_pernet_device(&vti_net_ops);
b9959fd3	388	pr_info("vti init: can't register tunnel\n");
1181412c S	389	}
	390
	391	err = rtnl_link_register(&vti_link_ops);
	392	if (err < 0)
	393	goto rtnl_link_failed;
	394
	395	return err;
	396
	397	rtnl_link_failed:
	398	xfrm4_mode_tunnel_input_deregister(&vti_handler);
	399	unregister_pernet_device(&vti_net_ops);
	400	return err;
	401	}
	402
	403	static void __exit vti_fini(void)
	404	{
	405	rtnl_link_unregister(&vti_link_ops);
	406	if (xfrm4_mode_tunnel_input_deregister(&vti_handler))
	407	pr_info("vti close: can't deregister tunnel\n");
	408
	409	unregister_pernet_device(&vti_net_ops);
	410	}
	411
	412	module_init(vti_init);
	413	module_exit(vti_fini);
	414	MODULE_LICENSE("GPL");
	415	MODULE_ALIAS_RTNL_LINK("vti");
	416	MODULE_ALIAS_NETDEV("ip_vti0");