[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / ip_vti.c

/*
 *	Linux NET3: IP/IP protocol decoder modified to support
 *		    virtual tunnel interface
 *
 *	Authors:
 *		Saurabh Mohan (saurabh.mohan@vyatta.com) 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/init.h>
#include <linux/netfilter_ipv4.h>
#include <linux/if_ether.h>
#include <linux/icmpv6.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 unsigned int vti_net_id __read_mostly;
static int vti_tunnel_init(struct net_device *dev);

static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
		     int encap_type)
{
	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) {
		if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
			goto drop;

		XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;

		return xfrm_input(skb, nexthdr, spi, encap_type);
	}

	return -EINVAL;
drop:
	kfree_skb(skb);
	return 0;
}

static int vti_rcv(struct sk_buff *skb)
{
	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);

	return vti_input(skb, ip_hdr(skb)->protocol, 0, 0);
}

static int vti_rcv_cb(struct sk_buff *skb, int err)
{
	unsigned short family;
	struct net_device *dev;
	struct pcpu_sw_netstats *tstats;
	struct xfrm_state *x;
	struct xfrm_mode *inner_mode;
	struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
	u32 orig_mark = skb->mark;
	int ret;

	if (!tunnel)
		return 1;

	dev = tunnel->dev;

	if (err) {
		dev->stats.rx_errors++;
		dev->stats.rx_dropped++;

		return 0;
	}

	x = xfrm_input_state(skb);

	inner_mode = x->inner_mode;

	if (x->sel.family == AF_UNSPEC) {
		inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
		if (inner_mode == NULL) {
			XFRM_INC_STATS(dev_net(skb->dev),
				       LINUX_MIB_XFRMINSTATEMODEERROR);
			return -EINVAL;
		}
	}

	family = inner_mode->afinfo->family;

	skb->mark = be32_to_cpu(tunnel->parms.i_key);
	ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
	skb->mark = orig_mark;

	if (!ret)
		return -EPERM;

	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev)));
	skb->dev = dev;

	tstats = this_cpu_ptr(dev->tstats);

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

	return 0;
}

static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
{
	xfrm_address_t *daddr = (xfrm_address_t *)&dst;
	xfrm_address_t *saddr = (xfrm_address_t *)&src;

	/* if there is no transform then this tunnel is not functional.
	 * Or if the xfrm is not mode tunnel.
	 */
	if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
	    x->props.family != AF_INET)
		return false;

	if (!dst)
		return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);

	if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
		return false;

	return true;
}

static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
			    struct flowi *fl)
{
	struct ip_tunnel *tunnel = netdev_priv(dev);
	struct ip_tunnel_parm *parms = &tunnel->parms;
	struct dst_entry *dst = skb_dst(skb);
	struct net_device *tdev;	/* Device to other host */
	int err;
	int mtu;

	if (!dst) {
		dev->stats.tx_carrier_errors++;
		goto tx_error_icmp;
	}

	dst_hold(dst);
	dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
	if (IS_ERR(dst)) {
		dev->stats.tx_carrier_errors++;
		goto tx_error_icmp;
	}

	if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
		dev->stats.tx_carrier_errors++;
		dst_release(dst);
		goto tx_error_icmp;
	}

	tdev = dst->dev;

	if (tdev == dev) {
		dst_release(dst);
		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;
	}

	mtu = dst_mtu(dst);
	if (skb->len > mtu) {
		skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
		if (skb->protocol == htons(ETH_P_IP)) {
			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
				  htonl(mtu));
		} else {
			if (mtu < IPV6_MIN_MTU)
				mtu = IPV6_MIN_MTU;

			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
		}

		dst_release(dst);
		goto tx_error;
	}

	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
	skb_dst_set(skb, dst);
	skb->dev = skb_dst(skb)->dev;

	err = dst_output(tunnel->net, skb->sk, skb);
	if (net_xmit_eval(err) == 0)
		err = skb->len;
	iptunnel_xmit_stats(dev, err);
	return NETDEV_TX_OK;

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

/* 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 flowi fl;

	memset(&fl, 0, sizeof(fl));

	switch (skb->protocol) {
	case htons(ETH_P_IP):
		xfrm_decode_session(skb, &fl, AF_INET);
		memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
		break;
	case htons(ETH_P_IPV6):
		xfrm_decode_session(skb, &fl, AF_INET6);
		memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
		break;
	default:
		dev->stats.tx_errors++;
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;
	}

	/* override mark with tunnel output key */
	fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);

	return vti_xmit(skb, dev, &fl);
}

static int vti4_err(struct sk_buff *skb, u32 info)
{
	__be32 spi;
	__u32 mark;
	struct xfrm_state *x;
	struct ip_tunnel *tunnel;
	struct ip_esp_hdr *esph;
	struct ip_auth_hdr *ah ;
	struct ip_comp_hdr *ipch;
	struct net *net = dev_net(skb->dev);
	const struct iphdr *iph = (const struct iphdr *)skb->data;
	int protocol = iph->protocol;
	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);

	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
				  iph->daddr, iph->saddr, 0);
	if (!tunnel)
		return -1;

	mark = be32_to_cpu(tunnel->parms.o_key);

	switch (protocol) {
	case IPPROTO_ESP:
		esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
		spi = esph->spi;
		break;
	case IPPROTO_AH:
		ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
		spi = ah->spi;
		break;
	case IPPROTO_COMP:
		ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
		spi = htonl(ntohs(ipch->cpi));
		break;
	default:
		return 0;
	}

	switch (icmp_hdr(skb)->type) {
	case ICMP_DEST_UNREACH:
		if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
			return 0;
	case ICMP_REDIRECT:
		break;
	default:
		return 0;
	}

	x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
			      spi, protocol, AF_INET);
	if (!x)
		return 0;

	if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
		ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
	else
		ipv4_redirect(skb, net, 0, 0, protocol, 0);
	xfrm_state_put(x);

	return 0;
}

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;
	}

	if (!(p.i_flags & GRE_KEY))
		p.i_key = 0;
	if (!(p.o_flags & GRE_KEY))
		p.o_key = 0;

	p.i_flags = VTI_ISVTI;

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

	if (cmd != SIOCDELTUNNEL) {
		p.i_flags |= GRE_KEY;
		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,
	.ndo_get_iflink = ip_tunnel_get_iflink,
};

static void vti_tunnel_setup(struct net_device *dev)
{
	dev->netdev_ops		= &vti_netdev_ops;
	dev->type		= ARPHRD_TUNNEL;
	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->hard_header_len	= LL_MAX_HEADER + sizeof(struct iphdr);
	dev->mtu		= ETH_DATA_LEN;
	dev->flags		= IFF_NOARP;
	dev->addr_len		= 4;
	dev->features		|= NETIF_F_LLTX;
	netif_keep_dst(dev);

	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 xfrm4_protocol vti_esp4_protocol __read_mostly = {
	.handler	=	vti_rcv,
	.input_handler	=	vti_input,
	.cb_handler	=	vti_rcv_cb,
	.err_handler	=	vti4_err,
	.priority	=	100,
};

static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
	.handler	=	vti_rcv,
	.input_handler	=	vti_input,
	.cb_handler	=	vti_rcv_cb,
	.err_handler	=	vti4_err,
	.priority	=	100,
};

static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
	.handler	=	vti_rcv,
	.input_handler	=	vti_input,
	.cb_handler	=	vti_rcv_cb,
	.err_handler	=	vti4_err,
	.priority	=	100,
};

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,
			      __u32 *fwmark)
{
	memset(parms, 0, sizeof(*parms));

	parms->iph.protocol = IPPROTO_IPIP;

	if (!data)
		return;

	parms->i_flags = VTI_ISVTI;

	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_in_addr(data[IFLA_VTI_LOCAL]);

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

	if (data[IFLA_VTI_FWMARK])
		*fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
}

static int vti_newlink(struct net *src_net, struct net_device *dev,
		       struct nlattr *tb[], struct nlattr *data[])
{
	struct ip_tunnel_parm parms;
	__u32 fwmark = 0;

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

static int vti_changelink(struct net_device *dev, struct nlattr *tb[],
			  struct nlattr *data[])
{
	struct ip_tunnel *t = netdev_priv(dev);
	__u32 fwmark = t->fwmark;
	struct ip_tunnel_parm p;

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

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) +
		/* IFLA_VTI_FWMARK */
		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;

	if (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_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) ||
	    nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) ||
	    nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
		return -EMSGSIZE;

	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) },
	[IFLA_VTI_FWMARK]	= { .type = NLA_U32 },
};

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,
	.dellink        = ip_tunnel_dellink,
	.get_size	= vti_get_size,
	.fill_info	= vti_fill_info,
	.get_link_net	= ip_tunnel_get_link_net,
};

static bool is_vti_tunnel(const struct net_device *dev)
{
	return dev->netdev_ops == &vti_netdev_ops;
}

static int vti_device_event(struct notifier_block *unused,
			    unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct ip_tunnel *tunnel = netdev_priv(dev);

	if (!is_vti_tunnel(dev))
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_DOWN:
		if (!net_eq(tunnel->net, dev_net(dev)))
			xfrm_garbage_collect(tunnel->net);
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block vti_notifier_block __read_mostly = {
	.notifier_call = vti_device_event,
};

static int __init vti_init(void)
{
	const char *msg;
	int err;

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

	register_netdevice_notifier(&vti_notifier_block);

	msg = "tunnel device";
	err = register_pernet_device(&vti_net_ops);
	if (err < 0)
		goto pernet_dev_failed;

	msg = "tunnel protocols";
	err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
	if (err < 0)
		goto xfrm_proto_esp_failed;
	err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
	if (err < 0)
		goto xfrm_proto_ah_failed;
	err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
	if (err < 0)
		goto xfrm_proto_comp_failed;

	msg = "netlink interface";
	err = rtnl_link_register(&vti_link_ops);
	if (err < 0)
		goto rtnl_link_failed;

	return err;

rtnl_link_failed:
	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
xfrm_proto_comp_failed:
	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
xfrm_proto_ah_failed:
	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
xfrm_proto_esp_failed:
	unregister_pernet_device(&vti_net_ops);
pernet_dev_failed:
	unregister_netdevice_notifier(&vti_notifier_block);
	pr_err("vti init: failed to register %s\n", msg);
	return err;
}

static void __exit vti_fini(void)
{
	rtnl_link_unregister(&vti_link_ops);
	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
	unregister_pernet_device(&vti_net_ops);
	unregister_netdevice_notifier(&vti_notifier_block);
}

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 (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>
1181412c S	33	#include <linux/init.h>
	34	#include <linux/netfilter_ipv4.h>
	35	#include <linux/if_ether.h>
78a010cc	36	#include <linux/icmpv6.h>
1181412c S	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;
1181412c S	48
c7d03a00	49	static unsigned int vti_net_id __read_mostly;
1181412c	50	static int vti_tunnel_init(struct net_device *dev);
1181412c	51
df3893c1 SK	52	static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi,
df3893c1 SK	53	int encap_type)
1181412c S	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);
00db4124	62	if (tunnel) {
df3893c1 SK	63	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
	64	goto drop;
	65
	66	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel;
df3893c1 SK	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
	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
	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;
1fb81e09	91	struct xfrm_mode *inner_mode;
df3893c1	92	struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4;
d55c670c AD	93	u32 orig_mark = skb->mark;
d55c670c AD	94	int ret;
df3893c1 SK	95
df3893c1 SK	96	if (!tunnel)
1181412c	97	return 1;
df3893c1 SK	98
	99	dev = tunnel->dev;
	100
	101	if (err) {
	102	dev->stats.rx_errors++;
	103	dev->stats.rx_dropped++;
	104
	105	return 0;
1181412c	106	}
1181412c	107
df3893c1	108	x = xfrm_input_state(skb);
1fb81e09	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;
df3893c1	122
d55c670c AD	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)
df3893c1 SK	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;
1181412c S	141	}
1181412c S	142
6e2de802 SK	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
78a010cc SK	164	static netdev_tx_t vti_xmit(struct sk_buff skb, struct net_device dev,
78a010cc SK	165	struct flowi *fl)
1181412c S	166	{
1181412c S	167	struct ip_tunnel *tunnel = netdev_priv(dev);
6e2de802	168	struct ip_tunnel_parm *parms = &tunnel->parms;
a34cd4f3	169	struct dst_entry *dst = skb_dst(skb);
1181412c	170	struct net_device tdev; / Device to other host */
b9959fd3	171	int err;
d6af1a31	172	int mtu;
1181412c	173
a34cd4f3	174	if (!dst) {
df3893c1 SK	175	dev->stats.tx_carrier_errors++;
	176	goto tx_error_icmp;
	177	}
1181412c	178
a34cd4f3	179	dst_hold(dst);
78a010cc	180	dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0);
a34cd4f3	181	if (IS_ERR(dst)) {
1181412c S	182	dev->stats.tx_carrier_errors++;
	183	goto tx_error_icmp;
	184	}
df3893c1	185
6e2de802	186	if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
1181412c	187	dev->stats.tx_carrier_errors++;
a34cd4f3	188	dst_release(dst);
1181412c S	189	goto tx_error_icmp;
1181412c S	190	}
6e2de802	191
a34cd4f3	192	tdev = dst->dev;
1181412c S	193
1181412c S	194	if (tdev == dev) {
a34cd4f3	195	dst_release(dst);
1181412c S	196	dev->stats.collisions++;
	197	goto tx_error;
	198	}
	199
	200	if (tunnel->err_count > 0) {
	201	if (time_before(jiffies,
	202	tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
	203	tunnel->err_count--;
	204	dst_link_failure(skb);
	205	} else
	206	tunnel->err_count = 0;
	207	}
	208
d6af1a31 SK	209	mtu = dst_mtu(dst);
	210	if (skb->len > mtu) {
	211	skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
	212	if (skb->protocol == htons(ETH_P_IP)) {
	213	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
	214	htonl(mtu));
	215	} else {
	216	if (mtu < IPV6_MIN_MTU)
	217	mtu = IPV6_MIN_MTU;
	218
	219	icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
	220	}
	221
	222	dst_release(dst);
	223	goto tx_error;
	224	}
	225
df3893c1	226	skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
a34cd4f3	227	skb_dst_set(skb, dst);
1181412c S	228	skb->dev = skb_dst(skb)->dev;
1181412c S	229
13206b6b	230	err = dst_output(tunnel->net, skb->sk, skb);
b9959fd3 AW	231	if (net_xmit_eval(err) == 0)
b9959fd3 AW	232	err = skb->len;
039f5062	233	iptunnel_xmit_stats(dev, err);
1181412c S	234	return NETDEV_TX_OK;
	235
	236	tx_error_icmp:
	237	dst_link_failure(skb);
	238	tx_error:
	239	dev->stats.tx_errors++;
3acfa1e7	240	kfree_skb(skb);
1181412c S	241	return NETDEV_TX_OK;
	242	}
	243
78a010cc SK	244	/* This function assumes it is being called from dev_queue_xmit()
	245	* and that skb is filled properly by that function.
	246	*/
	247	static netdev_tx_t vti_tunnel_xmit(struct sk_buff skb, struct net_device dev)
	248	{
	249	struct ip_tunnel *tunnel = netdev_priv(dev);
	250	struct flowi fl;
	251
	252	memset(&fl, 0, sizeof(fl));
	253
78a010cc SK	254	switch (skb->protocol) {
	255	case htons(ETH_P_IP):
	256	xfrm_decode_session(skb, &fl, AF_INET);
	257	memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
	258	break;
	259	case htons(ETH_P_IPV6):
	260	xfrm_decode_session(skb, &fl, AF_INET6);
	261	memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
	262	break;
	263	default:
	264	dev->stats.tx_errors++;
	265	dev_kfree_skb(skb);
	266	return NETDEV_TX_OK;
	267	}
	268
cd5279c1 AD	269	/* override mark with tunnel output key */
	270	fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key);
	271
78a010cc SK	272	return vti_xmit(skb, dev, &fl);
	273	}
	274
df3893c1 SK	275	static int vti4_err(struct sk_buff *skb, u32 info)
	276	{
	277	__be32 spi;
6d004d6c	278	__u32 mark;
df3893c1 SK	279	struct xfrm_state *x;
	280	struct ip_tunnel *tunnel;
	281	struct ip_esp_hdr *esph;
	282	struct ip_auth_hdr *ah ;
	283	struct ip_comp_hdr *ipch;
	284	struct net *net = dev_net(skb->dev);
	285	const struct iphdr iph = (const struct iphdr )skb->data;
	286	int protocol = iph->protocol;
	287	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
	288
	289	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
	290	iph->daddr, iph->saddr, 0);
	291	if (!tunnel)
	292	return -1;
	293
6d004d6c SK	294	mark = be32_to_cpu(tunnel->parms.o_key);
6d004d6c SK	295
df3893c1 SK	296	switch (protocol) {
	297	case IPPROTO_ESP:
	298	esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
	299	spi = esph->spi;
	300	break;
	301	case IPPROTO_AH:
	302	ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
	303	spi = ah->spi;
	304	break;
	305	case IPPROTO_COMP:
	306	ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2));
	307	spi = htonl(ntohs(ipch->cpi));
	308	break;
	309	default:
	310	return 0;
	311	}
	312
	313	switch (icmp_hdr(skb)->type) {
	314	case ICMP_DEST_UNREACH:
	315	if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
	316	return 0;
	317	case ICMP_REDIRECT:
	318	break;
	319	default:
	320	return 0;
	321	}
	322
6d004d6c	323	x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
df3893c1 SK	324	spi, protocol, AF_INET);
	325	if (!x)
	326	return 0;
	327
	328	if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
	329	ipv4_update_pmtu(skb, net, info, 0, 0, protocol, 0);
	330	else
	331	ipv4_redirect(skb, net, 0, 0, protocol, 0);
	332	xfrm_state_put(x);
	333
	334	return 0;
	335	}
	336
1181412c S	337	static int
	338	vti_tunnel_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	339	{
	340	int err = 0;
	341	struct ip_tunnel_parm p;
1181412c	342
b9959fd3 AW	343	if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
b9959fd3 AW	344	return -EFAULT;
1181412c	345
b9959fd3	346	if (cmd == SIOCADDTUNNEL \|\| cmd == SIOCCHGTUNNEL) {
1181412c S	347	if (p.iph.version != 4 \|\| p.iph.protocol != IPPROTO_IPIP \|\|
1181412c S	348	p.iph.ihl != 5)
b9959fd3 AW	349	return -EINVAL;
b9959fd3 AW	350	}
1181412c	351
7c8e6b9c DP	352	if (!(p.i_flags & GRE_KEY))
	353	p.i_key = 0;
	354	if (!(p.o_flags & GRE_KEY))
	355	p.o_key = 0;
	356
	357	p.i_flags = VTI_ISVTI;
	358
b9959fd3 AW	359	err = ip_tunnel_ioctl(dev, &p, cmd);
	360	if (err)
	361	return err;
1181412c	362
b9959fd3	363	if (cmd != SIOCDELTUNNEL) {
df3893c1	364	p.i_flags \|= GRE_KEY;
b9959fd3	365	p.o_flags \|= GRE_KEY;
1181412c S	366	}
1181412c S	367
b9959fd3 AW	368	if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
b9959fd3 AW	369	return -EFAULT;
1181412c S	370	return 0;
	371	}
	372
	373	static const struct net_device_ops vti_netdev_ops = {
	374	.ndo_init = vti_tunnel_init,
b9959fd3	375	.ndo_uninit = ip_tunnel_uninit,
1181412c S	376	.ndo_start_xmit = vti_tunnel_xmit,
1181412c S	377	.ndo_do_ioctl = vti_tunnel_ioctl,
b9959fd3	378	.ndo_change_mtu = ip_tunnel_change_mtu,
f61dd388	379	.ndo_get_stats64 = ip_tunnel_get_stats64,
1e99584b	380	.ndo_get_iflink = ip_tunnel_get_iflink,
1181412c S	381	};
1181412c S	382
b9959fd3	383	static void vti_tunnel_setup(struct net_device *dev)
1181412c	384	{
b9959fd3	385	dev->netdev_ops = &vti_netdev_ops;
8d89dcdf	386	dev->type = ARPHRD_TUNNEL;
b9959fd3	387	ip_tunnel_setup(dev, vti_net_id);
1181412c S	388	}
1181412c S	389
b9959fd3	390	static int vti_tunnel_init(struct net_device *dev)
1181412c	391	{
b9959fd3 AW	392	struct ip_tunnel *tunnel = netdev_priv(dev);
	393	struct iphdr *iph = &tunnel->parms.iph;
	394
	395	memcpy(dev->dev_addr, &iph->saddr, 4);
	396	memcpy(dev->broadcast, &iph->daddr, 4);
1181412c	397
1181412c S	398	dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
	399	dev->mtu = ETH_DATA_LEN;
	400	dev->flags = IFF_NOARP;
1181412c	401	dev->addr_len = 4;
1181412c	402	dev->features \|= NETIF_F_LLTX;
02875878	403	netif_keep_dst(dev);
1181412c	404
b9959fd3	405	return ip_tunnel_init(dev);
1181412c S	406	}
1181412c S	407
b9959fd3	408	static void __net_init vti_fb_tunnel_init(struct net_device *dev)
1181412c S	409	{
	410	struct ip_tunnel *tunnel = netdev_priv(dev);
	411	struct iphdr *iph = &tunnel->parms.iph;
1181412c	412
1181412c S	413	iph->version = 4;
	414	iph->protocol = IPPROTO_IPIP;
	415	iph->ihl = 5;
1181412c S	416	}
1181412c S	417
df3893c1	418	static struct xfrm4_protocol vti_esp4_protocol __read_mostly = {
1181412c	419	.handler = vti_rcv,
df3893c1 SK	420	.input_handler = vti_input,
	421	.cb_handler = vti_rcv_cb,
	422	.err_handler = vti4_err,
	423	.priority = 100,
	424	};
	425
	426	static struct xfrm4_protocol vti_ah4_protocol __read_mostly = {
	427	.handler = vti_rcv,
	428	.input_handler = vti_input,
	429	.cb_handler = vti_rcv_cb,
	430	.err_handler = vti4_err,
	431	.priority = 100,
	432	};
	433
	434	static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = {
	435	.handler = vti_rcv,
	436	.input_handler = vti_input,
	437	.cb_handler = vti_rcv_cb,
	438	.err_handler = vti4_err,
	439	.priority = 100,
1181412c S	440	};
1181412c S	441
1181412c S	442	static int __net_init vti_init_net(struct net *net)
	443	{
	444	int err;
b9959fd3	445	struct ip_tunnel_net *itn;
1181412c	446
b9959fd3	447	err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0");
1181412c	448	if (err)
b9959fd3 AW	449	return err;
	450	itn = net_generic(net, vti_net_id);
	451	vti_fb_tunnel_init(itn->fb_tunnel_dev);
1181412c	452	return 0;
1181412c S	453	}
	454
	455	static void __net_exit vti_exit_net(struct net *net)
	456	{
b9959fd3	457	struct ip_tunnel_net *itn = net_generic(net, vti_net_id);
6c742e71	458	ip_tunnel_delete_net(itn, &vti_link_ops);
1181412c S	459	}
	460
	461	static struct pernet_operations vti_net_ops = {
	462	.init = vti_init_net,
	463	.exit = vti_exit_net,
	464	.id = &vti_net_id,
b9959fd3	465	.size = sizeof(struct ip_tunnel_net),
1181412c S	466	};
	467
	468	static int vti_tunnel_validate(struct nlattr tb[], struct nlattr data[])
	469	{
	470	return 0;
	471	}
	472
	473	static void vti_netlink_parms(struct nlattr *data[],
9830ad4c CG	474	struct ip_tunnel_parm *parms,
9830ad4c CG	475	__u32 *fwmark)
1181412c S	476	{
	477	memset(parms, 0, sizeof(*parms));
	478
	479	parms->iph.protocol = IPPROTO_IPIP;
	480
	481	if (!data)
	482	return;
	483
df3893c1 SK	484	parms->i_flags = VTI_ISVTI;
df3893c1 SK	485
1181412c S	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])
67b61f6c	496	parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]);
1181412c S	497
1181412c S	498	if (data[IFLA_VTI_REMOTE])
67b61f6c	499	parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]);
1181412c	500
9830ad4c CG	501	if (data[IFLA_VTI_FWMARK])
9830ad4c CG	502	*fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
1181412c S	503	}
	504
	505	static int vti_newlink(struct net src_net, struct net_device dev,
	506	struct nlattr tb[], struct nlattr data[])
	507	{
b9959fd3	508	struct ip_tunnel_parm parms;
9830ad4c	509	__u32 fwmark = 0;
1181412c	510
9830ad4c CG	511	vti_netlink_parms(data, &parms, &fwmark);
9830ad4c CG	512	return ip_tunnel_newlink(dev, tb, &parms, fwmark);
1181412c S	513	}
	514
	515	static int vti_changelink(struct net_device dev, struct nlattr tb[],
	516	struct nlattr *data[])
	517	{
9830ad4c CG	518	struct ip_tunnel *t = netdev_priv(dev);
9830ad4c CG	519	__u32 fwmark = t->fwmark;
1181412c	520	struct ip_tunnel_parm p;
1181412c	521
9830ad4c CG	522	vti_netlink_parms(data, &p, &fwmark);
9830ad4c CG	523	return ip_tunnel_changelink(dev, tb, &p, fwmark);
1181412c S	524	}
	525
	526	static size_t vti_get_size(const struct net_device *dev)
	527	{
	528	return
	529	/* IFLA_VTI_LINK */
	530	nla_total_size(4) +
	531	/* IFLA_VTI_IKEY */
	532	nla_total_size(4) +
	533	/* IFLA_VTI_OKEY */
	534	nla_total_size(4) +
	535	/* IFLA_VTI_LOCAL */
	536	nla_total_size(4) +
	537	/* IFLA_VTI_REMOTE */
	538	nla_total_size(4) +
9830ad4c CG	539	/* IFLA_VTI_FWMARK */
9830ad4c CG	540	nla_total_size(4) +
1181412c S	541	0;
	542	}
	543
	544	static int vti_fill_info(struct sk_buff skb, const struct net_device dev)
	545	{
	546	struct ip_tunnel *t = netdev_priv(dev);
	547	struct ip_tunnel_parm *p = &t->parms;
	548
8ed508fd HL	549	if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) \|\|
	550	nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) \|\|
	551	nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) \|\|
	552	nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) \|\|
	553	nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) \|\|
	554	nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark))
	555	return -EMSGSIZE;
1181412c S	556
	557	return 0;
	558	}
	559
	560	static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = {
	561	[IFLA_VTI_LINK] = { .type = NLA_U32 },
	562	[IFLA_VTI_IKEY] = { .type = NLA_U32 },
	563	[IFLA_VTI_OKEY] = { .type = NLA_U32 },
	564	[IFLA_VTI_LOCAL] = { .len = FIELD_SIZEOF(struct iphdr, saddr) },
	565	[IFLA_VTI_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
9830ad4c	566	[IFLA_VTI_FWMARK] = { .type = NLA_U32 },
1181412c S	567	};
	568
	569	static struct rtnl_link_ops vti_link_ops __read_mostly = {
	570	.kind = "vti",
	571	.maxtype = IFLA_VTI_MAX,
	572	.policy = vti_policy,
	573	.priv_size = sizeof(struct ip_tunnel),
	574	.setup = vti_tunnel_setup,
	575	.validate = vti_tunnel_validate,
	576	.newlink = vti_newlink,
	577	.changelink = vti_changelink,
20ea60ca	578	.dellink = ip_tunnel_dellink,
1181412c S	579	.get_size = vti_get_size,
1181412c S	580	.fill_info = vti_fill_info,
1728d4fa	581	.get_link_net = ip_tunnel_get_link_net,
1181412c S	582	};
1181412c S	583
a5d0dc81 LR	584	static bool is_vti_tunnel(const struct net_device *dev)
	585	{
	586	return dev->netdev_ops == &vti_netdev_ops;
	587	}
	588
	589	static int vti_device_event(struct notifier_block *unused,
	590	unsigned long event, void *ptr)
	591	{
	592	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	593	struct ip_tunnel *tunnel = netdev_priv(dev);
	594
	595	if (!is_vti_tunnel(dev))
	596	return NOTIFY_DONE;
	597
	598	switch (event) {
	599	case NETDEV_DOWN:
	600	if (!net_eq(tunnel->net, dev_net(dev)))
	601	xfrm_garbage_collect(tunnel->net);
	602	break;
	603	}
	604	return NOTIFY_DONE;
	605	}
	606
	607	static struct notifier_block vti_notifier_block __read_mostly = {
	608	.notifier_call = vti_device_event,
	609	};
	610
1181412c S	611	static int __init vti_init(void)
1181412c S	612	{
1990e4f8	613	const char *msg;
1181412c S	614	int err;
1181412c S	615
1990e4f8	616	pr_info("IPv4 over IPsec tunneling driver\n");
1181412c	617
a5d0dc81 LR	618	register_netdevice_notifier(&vti_notifier_block);
a5d0dc81 LR	619
1990e4f8	620	msg = "tunnel device";
1181412c S	621	err = register_pernet_device(&vti_net_ops);
1181412c S	622	if (err < 0)
1990e4f8	623	goto pernet_dev_failed;
df3893c1	624
1990e4f8 MK	625	msg = "tunnel protocols";
	626	err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
	627	if (err < 0)
	628	goto xfrm_proto_esp_failed;
df3893c1	629	err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
1990e4f8 MK	630	if (err < 0)
1990e4f8 MK	631	goto xfrm_proto_ah_failed;
df3893c1	632	err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
1990e4f8 MK	633	if (err < 0)
1990e4f8 MK	634	goto xfrm_proto_comp_failed;
1181412c	635
1990e4f8	636	msg = "netlink interface";
1181412c S	637	err = rtnl_link_register(&vti_link_ops);
	638	if (err < 0)
	639	goto rtnl_link_failed;
	640
	641	return err;
	642
	643	rtnl_link_failed:
df3893c1	644	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
1990e4f8	645	xfrm_proto_comp_failed:
df3893c1	646	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
1990e4f8	647	xfrm_proto_ah_failed:
df3893c1	648	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
1990e4f8	649	xfrm_proto_esp_failed:
1181412c	650	unregister_pernet_device(&vti_net_ops);
1990e4f8	651	pernet_dev_failed:
a5d0dc81	652	unregister_netdevice_notifier(&vti_notifier_block);
1990e4f8	653	pr_err("vti init: failed to register %s\n", msg);
1181412c S	654	return err;
	655	}
	656
	657	static void __exit vti_fini(void)
	658	{
	659	rtnl_link_unregister(&vti_link_ops);
1990e4f8 MK	660	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
	661	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
	662	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
1181412c	663	unregister_pernet_device(&vti_net_ops);
a5d0dc81	664	unregister_netdevice_notifier(&vti_notifier_block);
1181412c S	665	}
	666
	667	module_init(vti_init);
	668	module_exit(vti_fini);
	669	MODULE_LICENSE("GPL");
	670	MODULE_ALIAS_RTNL_LINK("vti");
	671	MODULE_ALIAS_NETDEV("ip_vti0");