Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 716 insertions, 0 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
new file mode 100644
index 000000000..75d35e76b
--- /dev/null
+++ b/net/ipv4/ipip.c
@@ -0,0 +1,716 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	Linux NET3:	IP/IP protocol decoder.
+ *
+ *	Authors:
+ *		Sam Lantinga (slouken@cs.ucdavis.edu)  02/01/95
+ *
+ *	Fixes:
+ *		Alan Cox	:	Merged and made usable non modular (its so tiny its silly as
+ *					a module taking up 2 pages).
+ *		Alan Cox	: 	Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph)
+ *					to keep ip_forward happy.
+ *		Alan Cox	:	More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8).
+ *		Kai Schulte	:	Fixed #defines for IP_FIREWALL->FIREWALL
+ *              David Woodhouse :       Perform some basic ICMP handling.
+ *                                      IPIP Routing without decapsulation.
+ *              Carlos Picoto   :       GRE over IP support
+ *		Alexey Kuznetsov:	Reworked. Really, now it is truncated version of ipv4/ip_gre.c.
+ *					I do not want to merge them together.
+ */
+
+/* tunnel.c: an IP tunnel driver
+
+	The purpose of this driver is to provide an IP tunnel through
+	which you can tunnel network traffic transparently across subnets.
+
+	This was written by looking at Nick Holloway's dummy driver
+	Thanks for the great code!
+
+		-Sam Lantinga	(slouken@cs.ucdavis.edu)  02/01/95
+
+	Minor tweaks:
+		Cleaned up the code a little and added some pre-1.3.0 tweaks.
+		dev->hard_header/hard_header_len changed to use no headers.
+		Comments/bracketing tweaked.
+		Made the tunnels use dev->name not tunnel: when error reporting.
+		Added tx_dropped stat
+
+		-Alan Cox	(alan@lxorguk.ukuu.org.uk) 21 March 95
+
+	Reworked:
+		Changed to tunnel to destination gateway in addition to the
+			tunnel's pointopoint address
+		Almost completely rewritten
+		Note:  There is currently no firewall or ICMP handling done.
+
+		-Sam Lantinga	(slouken@cs.ucdavis.edu) 02/13/96
+
+*/
+
+/* Things I wish I had known when writing the tunnel driver:
+
+	When the tunnel_xmit() function is called, the skb contains the
+	packet to be sent (plus a great deal of extra info), and dev
+	contains the tunnel device that _we_ are.
+
+	When we are passed a packet, we are expected to fill in the
+	source address with our source IP address.
+
+	What is the proper way to allocate, copy and free a buffer?
+	After you allocate it, it is a "0 length" chunk of memory
+	starting at zero.  If you want to add headers to the buffer
+	later, you'll have to call "skb_reserve(skb, amount)" with
+	the amount of memory you want reserved.  Then, you call
+	"skb_put(skb, amount)" with the amount of space you want in
+	the buffer.  skb_put() returns a pointer to the top (#0) of
+	that buffer.  skb->len is set to the amount of space you have
+	"allocated" with skb_put().  You can then write up to skb->len
+	bytes to that buffer.  If you need more, you can call skb_put()
+	again with the additional amount of space you need.  You can
+	find out how much more space you can allocate by calling
+	"skb_tailroom(skb)".
+	Now, to add header space, call "skb_push(skb, header_len)".
+	This creates space at the beginning of the buffer and returns
+	a pointer to this new space.  If later you need to strip a
+	header from a buffer, call "skb_pull(skb, header_len)".
+	skb_headroom() will return how much space is left at the top
+	of the buffer (before the main data).  Remember, this headroom
+	space must be reserved before the skb_put() function is called.
+	*/
+
+/*
+   This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.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/slab.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 <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>
+#include <net/dst_metadata.h>
+
+static bool log_ecn_error = true;
+module_param(log_ecn_error, bool, 0644);
+MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+
+static unsigned int ipip_net_id __read_mostly;
+
+static int ipip_tunnel_init(struct net_device *dev);
+static struct rtnl_link_ops ipip_link_ops __read_mostly;
+
+static int ipip_err(struct sk_buff *skb, u32 info)
+{
+	/* All the routers (except for Linux) return only
+	 * 8 bytes of packet payload. It means, that precise relaying of
+	 * ICMP in the real Internet is absolutely infeasible.
+	 */
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
+	const struct iphdr *iph = (const struct iphdr *)skb->data;
+	const int type = icmp_hdr(skb)->type;
+	const int code = icmp_hdr(skb)->code;
+	struct ip_tunnel *t;
+	int err = 0;
+
+	t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+			     iph->daddr, iph->saddr, 0);
+	if (!t) {
+		err = -ENOENT;
+		goto out;
+	}
+
+	switch (type) {
+	case ICMP_DEST_UNREACH:
+		switch (code) {
+		case ICMP_SR_FAILED:
+			/* Impossible event. */
+			goto out;
+		default:
+			/* All others are translated to HOST_UNREACH.
+			 * rfc2003 contains "deep thoughts" about NET_UNREACH,
+			 * I believe they are just ether pollution. --ANK
+			 */
+			break;
+		}
+		break;
+
+	case ICMP_TIME_EXCEEDED:
+		if (code != ICMP_EXC_TTL)
+			goto out;
+		break;
+
+	case ICMP_REDIRECT:
+		break;
+
+	default:
+		goto out;
+	}
+
+	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
+		ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol);
+		goto out;
+	}
+
+	if (type == ICMP_REDIRECT) {
+		ipv4_redirect(skb, net, t->parms.link, iph->protocol);
+		goto out;
+	}
+
+	if (t->parms.iph.daddr == 0) {
+		err = -ENOENT;
+		goto out;
+	}
+
+	if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
+		goto out;
+
+	if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
+		t->err_count++;
+	else
+		t->err_count = 1;
+	t->err_time = jiffies;
+
+out:
+	return err;
+}
+
+static const struct tnl_ptk_info ipip_tpi = {
+	/* no tunnel info required for ipip. */
+	.proto = htons(ETH_P_IP),
+};
+
+#if IS_ENABLED(CONFIG_MPLS)
+static const struct tnl_ptk_info mplsip_tpi = {
+	/* no tunnel info required for mplsip. */
+	.proto = htons(ETH_P_MPLS_UC),
+};
+#endif
+
+static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto)
+{
+	struct net *net = dev_net(skb->dev);
+	struct ip_tunnel_net *itn = net_generic(net, ipip_net_id);
+	struct metadata_dst *tun_dst = NULL;
+	struct ip_tunnel *tunnel;
+	const struct iphdr *iph;
+
+	iph = ip_hdr(skb);
+	tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
+			iph->saddr, iph->daddr, 0);
+	if (tunnel) {
+		const struct tnl_ptk_info *tpi;
+
+		if (tunnel->parms.iph.protocol != ipproto &&
+		    tunnel->parms.iph.protocol != 0)
+			goto drop;
+
+		if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+			goto drop;
+#if IS_ENABLED(CONFIG_MPLS)
+		if (ipproto == IPPROTO_MPLS)
+			tpi = &mplsip_tpi;
+		else
+#endif
+			tpi = &ipip_tpi;
+		if (iptunnel_pull_header(skb, 0, tpi->proto, false))
+			goto drop;
+		if (tunnel->collect_md) {
+			tun_dst = ip_tun_rx_dst(skb, 0, 0, 0);
+			if (!tun_dst)
+				return 0;
+		}
+		return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
+	}
+
+	return -1;
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int ipip_rcv(struct sk_buff *skb)
+{
+	return ipip_tunnel_rcv(skb, IPPROTO_IPIP);
+}
+
+#if IS_ENABLED(CONFIG_MPLS)
+static int mplsip_rcv(struct sk_buff *skb)
+{
+	return ipip_tunnel_rcv(skb, IPPROTO_MPLS);
+}
+#endif
+
+/*
+ *	This function assumes it is being called from dev_queue_xmit()
+ *	and that skb is filled properly by that function.
+ */
+static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb,
+				    struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	const struct iphdr  *tiph = &tunnel->parms.iph;
+	u8 ipproto;
+
+	if (!pskb_inet_may_pull(skb))
+		goto tx_error;
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		ipproto = IPPROTO_IPIP;
+		break;
+#if IS_ENABLED(CONFIG_MPLS)
+	case htons(ETH_P_MPLS_UC):
+		ipproto = IPPROTO_MPLS;
+		break;
+#endif
+	default:
+		goto tx_error;
+	}
+
+	if (tiph->protocol != ipproto && tiph->protocol != 0)
+		goto tx_error;
+
+	if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4))
+		goto tx_error;
+
+	skb_set_inner_ipproto(skb, ipproto);
+
+	if (tunnel->collect_md)
+		ip_md_tunnel_xmit(skb, dev, ipproto, 0);
+	else
+		ip_tunnel_xmit(skb, dev, tiph, ipproto);
+	return NETDEV_TX_OK;
+
+tx_error:
+	kfree_skb(skb);
+
+	dev->stats.tx_errors++;
+	return NETDEV_TX_OK;
+}
+
+static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto)
+{
+	switch (ipproto) {
+	case 0:
+	case IPPROTO_IPIP:
+#if IS_ENABLED(CONFIG_MPLS)
+	case IPPROTO_MPLS:
+#endif
+		return true;
+	}
+
+	return false;
+}
+
+static int
+ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+{
+	if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) {
+		if (p->iph.version != 4 ||
+		    !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) ||
+		    p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF)))
+			return -EINVAL;
+	}
+
+	p->i_key = p->o_key = 0;
+	p->i_flags = p->o_flags = 0;
+	return ip_tunnel_ctl(dev, p, cmd);
+}
+
+static const struct net_device_ops ipip_netdev_ops = {
+	.ndo_init       = ipip_tunnel_init,
+	.ndo_uninit     = ip_tunnel_uninit,
+	.ndo_start_xmit	= ipip_tunnel_xmit,
+	.ndo_do_ioctl	= ip_tunnel_ioctl,
+	.ndo_change_mtu = ip_tunnel_change_mtu,
+	.ndo_get_stats64 = ip_tunnel_get_stats64,
+	.ndo_get_iflink = ip_tunnel_get_iflink,
+	.ndo_tunnel_ctl	= ipip_tunnel_ctl,
+};
+
+#define IPIP_FEATURES (NETIF_F_SG |		\
+		       NETIF_F_FRAGLIST |	\
+		       NETIF_F_HIGHDMA |	\
+		       NETIF_F_GSO_SOFTWARE |	\
+		       NETIF_F_HW_CSUM)
+
+static void ipip_tunnel_setup(struct net_device *dev)
+{
+	dev->netdev_ops		= &ipip_netdev_ops;
+	dev->header_ops		= &ip_tunnel_header_ops;
+
+	dev->type		= ARPHRD_TUNNEL;
+	dev->flags		= IFF_NOARP;
+	dev->addr_len		= 4;
+	dev->features		|= NETIF_F_LLTX;
+	netif_keep_dst(dev);
+
+	dev->features		|= IPIP_FEATURES;
+	dev->hw_features	|= IPIP_FEATURES;
+	ip_tunnel_setup(dev, ipip_net_id);
+}
+
+static int ipip_tunnel_init(struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+
+	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
+	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
+
+	tunnel->tun_hlen = 0;
+	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
+	return ip_tunnel_init(dev);
+}
+
+static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
+				struct netlink_ext_ack *extack)
+{
+	u8 proto;
+
+	if (!data || !data[IFLA_IPTUN_PROTO])
+		return 0;
+
+	proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+	if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void ipip_netlink_parms(struct nlattr *data[],
+			       struct ip_tunnel_parm *parms, bool *collect_md,
+			       __u32 *fwmark)
+{
+	memset(parms, 0, sizeof(*parms));
+
+	parms->iph.version = 4;
+	parms->iph.protocol = IPPROTO_IPIP;
+	parms->iph.ihl = 5;
+	*collect_md = false;
+
+	if (!data)
+		return;
+
+	if (data[IFLA_IPTUN_LINK])
+		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
+
+	if (data[IFLA_IPTUN_LOCAL])
+		parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
+
+	if (data[IFLA_IPTUN_REMOTE])
+		parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
+
+	if (data[IFLA_IPTUN_TTL]) {
+		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
+		if (parms->iph.ttl)
+			parms->iph.frag_off = htons(IP_DF);
+	}
+
+	if (data[IFLA_IPTUN_TOS])
+		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
+
+	if (data[IFLA_IPTUN_PROTO])
+		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+
+	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
+		parms->iph.frag_off = htons(IP_DF);
+
+	if (data[IFLA_IPTUN_COLLECT_METADATA])
+		*collect_md = true;
+
+	if (data[IFLA_IPTUN_FWMARK])
+		*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
+}
+
+/* This function returns true when ENCAP attributes are present in the nl msg */
+static bool ipip_netlink_encap_parms(struct nlattr *data[],
+				     struct ip_tunnel_encap *ipencap)
+{
+	bool ret = false;
+
+	memset(ipencap, 0, sizeof(*ipencap));
+
+	if (!data)
+		return ret;
+
+	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
+		ret = true;
+		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
+		ret = true;
+		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
+		ret = true;
+		ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
+		ret = true;
+		ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
+	}
+
+	return ret;
+}
+
+static int ipip_newlink(struct net *src_net, struct net_device *dev,
+			struct nlattr *tb[], struct nlattr *data[],
+			struct netlink_ext_ack *extack)
+{
+	struct ip_tunnel *t = netdev_priv(dev);
+	struct ip_tunnel_parm p;
+	struct ip_tunnel_encap ipencap;
+	__u32 fwmark = 0;
+
+	if (ipip_netlink_encap_parms(data, &ipencap)) {
+		int err = ip_tunnel_encap_setup(t, &ipencap);
+
+		if (err < 0)
+			return err;
+	}
+
+	ipip_netlink_parms(data, &p, &t->collect_md, &fwmark);
+	return ip_tunnel_newlink(dev, tb, &p, fwmark);
+}
+
+static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
+			   struct nlattr *data[],
+			   struct netlink_ext_ack *extack)
+{
+	struct ip_tunnel *t = netdev_priv(dev);
+	struct ip_tunnel_parm p;
+	struct ip_tunnel_encap ipencap;
+	bool collect_md;
+	__u32 fwmark = t->fwmark;
+
+	if (ipip_netlink_encap_parms(data, &ipencap)) {
+		int err = ip_tunnel_encap_setup(t, &ipencap);
+
+		if (err < 0)
+			return err;
+	}
+
+	ipip_netlink_parms(data, &p, &collect_md, &fwmark);
+	if (collect_md)
+		return -EINVAL;
+
+	if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
+	    (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
+		return -EINVAL;
+
+	return ip_tunnel_changelink(dev, tb, &p, fwmark);
+}
+
+static size_t ipip_get_size(const struct net_device *dev)
+{
+	return
+		/* IFLA_IPTUN_LINK */
+		nla_total_size(4) +
+		/* IFLA_IPTUN_LOCAL */
+		nla_total_size(4) +
+		/* IFLA_IPTUN_REMOTE */
+		nla_total_size(4) +
+		/* IFLA_IPTUN_TTL */
+		nla_total_size(1) +
+		/* IFLA_IPTUN_TOS */
+		nla_total_size(1) +
+		/* IFLA_IPTUN_PROTO */
+		nla_total_size(1) +
+		/* IFLA_IPTUN_PMTUDISC */
+		nla_total_size(1) +
+		/* IFLA_IPTUN_ENCAP_TYPE */
+		nla_total_size(2) +
+		/* IFLA_IPTUN_ENCAP_FLAGS */
+		nla_total_size(2) +
+		/* IFLA_IPTUN_ENCAP_SPORT */
+		nla_total_size(2) +
+		/* IFLA_IPTUN_ENCAP_DPORT */
+		nla_total_size(2) +
+		/* IFLA_IPTUN_COLLECT_METADATA */
+		nla_total_size(0) +
+		/* IFLA_IPTUN_FWMARK */
+		nla_total_size(4) +
+		0;
+}
+
+static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+	struct ip_tunnel *tunnel = netdev_priv(dev);
+	struct ip_tunnel_parm *parm = &tunnel->parms;
+
+	if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
+	    nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
+	    nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
+	    nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
+	    nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
+	    nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) ||
+	    nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
+		       !!(parm->iph.frag_off & htons(IP_DF))) ||
+	    nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark))
+		goto nla_put_failure;
+
+	if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,
+			tunnel->encap.type) ||
+	    nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT,
+			 tunnel->encap.sport) ||
+	    nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT,
+			 tunnel->encap.dport) ||
+	    nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,
+			tunnel->encap.flags))
+		goto nla_put_failure;
+
+	if (tunnel->collect_md)
+		if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
+			goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
+static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = {
+	[IFLA_IPTUN_LINK]		= { .type = NLA_U32 },
+	[IFLA_IPTUN_LOCAL]		= { .type = NLA_U32 },
+	[IFLA_IPTUN_REMOTE]		= { .type = NLA_U32 },
+	[IFLA_IPTUN_TTL]		= { .type = NLA_U8 },
+	[IFLA_IPTUN_TOS]		= { .type = NLA_U8 },
+	[IFLA_IPTUN_PROTO]		= { .type = NLA_U8 },
+	[IFLA_IPTUN_PMTUDISC]		= { .type = NLA_U8 },
+	[IFLA_IPTUN_ENCAP_TYPE]		= { .type = NLA_U16 },
+	[IFLA_IPTUN_ENCAP_FLAGS]	= { .type = NLA_U16 },
+	[IFLA_IPTUN_ENCAP_SPORT]	= { .type = NLA_U16 },
+	[IFLA_IPTUN_ENCAP_DPORT]	= { .type = NLA_U16 },
+	[IFLA_IPTUN_COLLECT_METADATA]	= { .type = NLA_FLAG },
+	[IFLA_IPTUN_FWMARK]		= { .type = NLA_U32 },
+};
+
+static struct rtnl_link_ops ipip_link_ops __read_mostly = {
+	.kind		= "ipip",
+	.maxtype	= IFLA_IPTUN_MAX,
+	.policy		= ipip_policy,
+	.priv_size	= sizeof(struct ip_tunnel),
+	.setup		= ipip_tunnel_setup,
+	.validate	= ipip_tunnel_validate,
+	.newlink	= ipip_newlink,
+	.changelink	= ipip_changelink,
+	.dellink	= ip_tunnel_dellink,
+	.get_size	= ipip_get_size,
+	.fill_info	= ipip_fill_info,
+	.get_link_net	= ip_tunnel_get_link_net,
+};
+
+static struct xfrm_tunnel ipip_handler __read_mostly = {
+	.handler	=	ipip_rcv,
+	.err_handler	=	ipip_err,
+	.priority	=	1,
+};
+
+#if IS_ENABLED(CONFIG_MPLS)
+static struct xfrm_tunnel mplsip_handler __read_mostly = {
+	.handler	=	mplsip_rcv,
+	.err_handler	=	ipip_err,
+	.priority	=	1,
+};
+#endif
+
+static int __net_init ipip_init_net(struct net *net)
+{
+	return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
+}
+
+static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
+{
+	ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
+}
+
+static struct pernet_operations ipip_net_ops = {
+	.init = ipip_init_net,
+	.exit_batch = ipip_exit_batch_net,
+	.id   = &ipip_net_id,
+	.size = sizeof(struct ip_tunnel_net),
+};
+
+static int __init ipip_init(void)
+{
+	int err;
+
+	pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n");
+
+	err = register_pernet_device(&ipip_net_ops);
+	if (err < 0)
+		return err;
+	err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
+	if (err < 0) {
+		pr_info("%s: can't register tunnel\n", __func__);
+		goto xfrm_tunnel_ipip_failed;
+	}
+#if IS_ENABLED(CONFIG_MPLS)
+	err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS);
+	if (err < 0) {
+		pr_info("%s: can't register tunnel\n", __func__);
+		goto xfrm_tunnel_mplsip_failed;
+	}
+#endif
+	err = rtnl_link_register(&ipip_link_ops);
+	if (err < 0)
+		goto rtnl_link_failed;
+
+out:
+	return err;
+
+rtnl_link_failed:
+#if IS_ENABLED(CONFIG_MPLS)
+	xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS);
+xfrm_tunnel_mplsip_failed:
+
+#endif
+	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
+xfrm_tunnel_ipip_failed:
+	unregister_pernet_device(&ipip_net_ops);
+	goto out;
+}
+
+static void __exit ipip_fini(void)
+{
+	rtnl_link_unregister(&ipip_link_ops);
+	if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
+		pr_info("%s: can't deregister tunnel\n", __func__);
+#if IS_ENABLED(CONFIG_MPLS)
+	if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS))
+		pr_info("%s: can't deregister tunnel\n", __func__);
+#endif
+	unregister_pernet_device(&ipip_net_ops);
+}
+
+module_init(ipip_init);
+module_exit(ipip_fini);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("ipip");
+MODULE_ALIAS_NETDEV("tunl0");