diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
new file mode 100644
index 0000000..f0df02a
--- /dev/null
+++ b/include/linux/xfrm.h
@@ -0,0 +1,258 @@
+#ifndef _LINUX_XFRM_H
+#define _LINUX_XFRM_H
+
+#include <linux/types.h>
+
+/* All of the structures in this file may not change size as they are
+ * passed into the kernel from userspace via netlink sockets.
+ */
+
+/* Structure to encapsulate addresses. I do not want to use
+ * "standard" structure. My apologies.
+ */
+typedef union
+{
+	__u32		a4;
+	__u32		a6[4];
+} xfrm_address_t;
+
+/* Ident of a specific xfrm_state. It is used on input to lookup
+ * the state by (spi,daddr,ah/esp) or to store information about
+ * spi, protocol and tunnel address on output.
+ */
+struct xfrm_id
+{
+	xfrm_address_t	daddr;
+	__u32		spi;
+	__u8		proto;
+};
+
+/* Selector, used as selector both on policy rules (SPD) and SAs. */
+
+struct xfrm_selector
+{
+	xfrm_address_t	daddr;
+	xfrm_address_t	saddr;
+	__u16	dport;
+	__u16	dport_mask;
+	__u16	sport;
+	__u16	sport_mask;
+	__u16	family;
+	__u8	prefixlen_d;
+	__u8	prefixlen_s;
+	__u8	proto;
+	int	ifindex;
+	uid_t	user;
+};
+
+#define XFRM_INF (~(__u64)0)
+
+struct xfrm_lifetime_cfg
+{
+	__u64	soft_byte_limit;
+	__u64	hard_byte_limit;
+	__u64	soft_packet_limit;
+	__u64	hard_packet_limit;
+	__u64	soft_add_expires_seconds;
+	__u64	hard_add_expires_seconds;
+	__u64	soft_use_expires_seconds;
+	__u64	hard_use_expires_seconds;
+};
+
+struct xfrm_lifetime_cur
+{
+	__u64	bytes;
+	__u64	packets;
+	__u64	add_time;
+	__u64	use_time;
+};
+
+struct xfrm_replay_state
+{
+	__u32	oseq;
+	__u32	seq;
+	__u32	bitmap;
+};
+
+struct xfrm_algo {
+	char	alg_name[64];
+	int	alg_key_len;    /* in bits */
+	char	alg_key[0];
+};
+
+struct xfrm_stats {
+	__u32	replay_window;
+	__u32	replay;
+	__u32	integrity_failed;
+};
+
+enum
+{
+	XFRM_POLICY_IN	= 0,
+	XFRM_POLICY_OUT	= 1,
+	XFRM_POLICY_FWD	= 2,
+	XFRM_POLICY_MAX	= 3
+};
+
+enum
+{
+	XFRM_SHARE_ANY,		/* No limitations */
+	XFRM_SHARE_SESSION,	/* For this session only */
+	XFRM_SHARE_USER,	/* For this user only */
+	XFRM_SHARE_UNIQUE	/* Use once */
+};
+
+/* Netlink configuration messages.  */
+enum {
+	XFRM_MSG_BASE = 0x10,
+
+	XFRM_MSG_NEWSA = 0x10,
+#define XFRM_MSG_NEWSA XFRM_MSG_NEWSA
+	XFRM_MSG_DELSA,
+#define XFRM_MSG_DELSA XFRM_MSG_DELSA
+	XFRM_MSG_GETSA,
+#define XFRM_MSG_GETSA XFRM_MSG_GETSA
+
+	XFRM_MSG_NEWPOLICY,
+#define XFRM_MSG_NEWPOLICY XFRM_MSG_NEWPOLICY
+	XFRM_MSG_DELPOLICY,
+#define XFRM_MSG_DELPOLICY XFRM_MSG_DELPOLICY
+	XFRM_MSG_GETPOLICY,
+#define XFRM_MSG_GETPOLICY XFRM_MSG_GETPOLICY
+
+	XFRM_MSG_ALLOCSPI,
+#define XFRM_MSG_ALLOCSPI XFRM_MSG_ALLOCSPI
+	XFRM_MSG_ACQUIRE,
+#define XFRM_MSG_ACQUIRE XFRM_MSG_ACQUIRE
+	XFRM_MSG_EXPIRE,
+#define XFRM_MSG_EXPIRE XFRM_MSG_EXPIRE
+
+	XFRM_MSG_UPDPOLICY,
+#define XFRM_MSG_UPDPOLICY XFRM_MSG_UPDPOLICY
+	XFRM_MSG_UPDSA,
+#define XFRM_MSG_UPDSA XFRM_MSG_UPDSA
+
+	XFRM_MSG_POLEXPIRE,
+#define XFRM_MSG_POLEXPIRE XFRM_MSG_POLEXPIRE
+
+	XFRM_MSG_FLUSHSA,
+#define XFRM_MSG_FLUSHSA XFRM_MSG_FLUSHSA
+	XFRM_MSG_FLUSHPOLICY,
+#define XFRM_MSG_FLUSHPOLICY XFRM_MSG_FLUSHPOLICY
+
+	XFRM_MSG_MAX
+};
+
+struct xfrm_user_tmpl {
+	struct xfrm_id		id;
+	__u16			family;
+	xfrm_address_t		saddr;
+	__u32			reqid;
+	__u8			mode;
+	__u8			share;
+	__u8			optional;
+	__u32			aalgos;
+	__u32			ealgos;
+	__u32			calgos;
+};
+
+struct xfrm_encap_tmpl {
+	__u16		encap_type;
+	__u16		encap_sport;
+	__u16		encap_dport;
+	xfrm_address_t	encap_oa;
+};
+
+/* Netlink message attributes.  */
+enum xfrm_attr_type_t {
+	XFRMA_UNSPEC,
+	XFRMA_ALG_AUTH,		/* struct xfrm_algo */
+	XFRMA_ALG_CRYPT,	/* struct xfrm_algo */
+	XFRMA_ALG_COMP,		/* struct xfrm_algo */
+	XFRMA_ENCAP,		/* struct xfrm_algo + struct xfrm_encap_tmpl */
+	XFRMA_TMPL,		/* 1 or more struct xfrm_user_tmpl */
+	__XFRMA_MAX
+
+#define XFRMA_MAX (__XFRMA_MAX - 1)
+};
+
+struct xfrm_usersa_info {
+	struct xfrm_selector		sel;
+	struct xfrm_id			id;
+	xfrm_address_t			saddr;
+	struct xfrm_lifetime_cfg	lft;
+	struct xfrm_lifetime_cur	curlft;
+	struct xfrm_stats		stats;
+	__u32				seq;
+	__u32				reqid;
+	__u16				family;
+	__u8				mode; /* 0=transport,1=tunnel */
+	__u8				replay_window;
+	__u8				flags;
+#define XFRM_STATE_NOECN	1
+#define XFRM_STATE_DECAP_DSCP	2
+};
+
+struct xfrm_usersa_id {
+	xfrm_address_t			daddr;
+	__u32				spi;
+	__u16				family;
+	__u8				proto;
+};
+
+struct xfrm_userspi_info {
+	struct xfrm_usersa_info		info;
+	__u32				min;
+	__u32				max;
+};
+
+struct xfrm_userpolicy_info {
+	struct xfrm_selector		sel;
+	struct xfrm_lifetime_cfg	lft;
+	struct xfrm_lifetime_cur	curlft;
+	__u32				priority;
+	__u32				index;
+	__u8				dir;
+	__u8				action;
+#define XFRM_POLICY_ALLOW	0
+#define XFRM_POLICY_BLOCK	1
+	__u8				flags;
+#define XFRM_POLICY_LOCALOK	1	/* Allow user to override global policy */
+	__u8				share;
+};
+
+struct xfrm_userpolicy_id {
+	struct xfrm_selector		sel;
+	__u32				index;
+	__u8				dir;
+};
+
+struct xfrm_user_acquire {
+	struct xfrm_id			id;
+	xfrm_address_t			saddr;
+	struct xfrm_selector		sel;
+	struct xfrm_userpolicy_info	policy;
+	__u32				aalgos;
+	__u32				ealgos;
+	__u32				calgos;
+	__u32				seq;
+};
+
+struct xfrm_user_expire {
+	struct xfrm_usersa_info		state;
+	__u8				hard;
+};
+
+struct xfrm_user_polexpire {
+	struct xfrm_userpolicy_info	pol;
+	__u8				hard;
+};
+
+struct xfrm_usersa_flush {
+	__u8				proto;
+};
+
+#define XFRMGRP_ACQUIRE		1
+#define XFRMGRP_EXPIRE		2
+
+#endif /* _LINUX_XFRM_H */