#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
  {

  	__be32		a4;
  	__be32		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;

  	__be32		spi;

  	__u8		proto;
  };

  struct xfrm_sec_ctx {
  	__u8	ctx_doi;
  	__u8	ctx_alg;
  	__u16	ctx_len;
  	__u32	ctx_sid;
  	char	ctx_str[0];
  };
  
  /* Security Context Domains of Interpretation */
  #define XFRM_SC_DOI_RESERVED 0
  #define XFRM_SC_DOI_LSM 1
  
  /* Security Context Algorithms */
  #define XFRM_SC_ALG_RESERVED 0
  #define XFRM_SC_ALG_SELINUX 1

  /* Selector, used as selector both on policy rules (SPD) and SAs. */
  
  struct xfrm_selector
  {
  	xfrm_address_t	daddr;
  	xfrm_address_t	saddr;

  	__be16	dport;
  	__be16	dport_mask;
  	__be16	sport;
  	__be16	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_TYPE_MAIN	= 0,
  	XFRM_POLICY_TYPE_SUB	= 1,
  	XFRM_POLICY_TYPE_MAX	= 2
  };
  
  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 */
  };

  #define XFRM_MODE_TRANSPORT 0
  #define XFRM_MODE_TUNNEL 1

  #define XFRM_MODE_ROUTEOPTIMIZATION 2
  #define XFRM_MODE_IN_TRIGGER 3

  #define XFRM_MODE_BEET 4
  #define XFRM_MODE_MAX 5

  /* 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_NEWAE,
  #define XFRM_MSG_NEWAE XFRM_MSG_NEWAE
  	XFRM_MSG_GETAE,
  #define XFRM_MSG_GETAE XFRM_MSG_GETAE

  
  	XFRM_MSG_REPORT,
  #define XFRM_MSG_REPORT XFRM_MSG_REPORT

  	XFRM_MSG_MIGRATE,
  #define XFRM_MSG_MIGRATE XFRM_MSG_MIGRATE

  	XFRM_MSG_NEWSADINFO,
  #define XFRM_MSG_NEWSADINFO XFRM_MSG_NEWSADINFO
  	XFRM_MSG_GETSADINFO,
  #define XFRM_MSG_GETSADINFO XFRM_MSG_GETSADINFO

  
  	XFRM_MSG_NEWSPDINFO,
  #define XFRM_MSG_NEWSPDINFO XFRM_MSG_NEWSPDINFO
  	XFRM_MSG_GETSPDINFO,
  #define XFRM_MSG_GETSPDINFO XFRM_MSG_GETSPDINFO

  	__XFRM_MSG_MAX

  };

  #define XFRM_MSG_MAX (__XFRM_MSG_MAX - 1)

  #define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)

  /*
   * Generic LSM security context for comunicating to user space
   * NOTE: Same format as sadb_x_sec_ctx
   */
  struct xfrm_user_sec_ctx {
  	__u16			len;
  	__u16			exttype;
  	__u8			ctx_alg;  /* LSMs: e.g., selinux == 1 */
  	__u8			ctx_doi;
  	__u16			ctx_len;
  };

  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;

  	__be16		encap_sport;
  	__be16		encap_dport;

  	xfrm_address_t	encap_oa;
  };

  /* AEVENT flags  */
  enum xfrm_ae_ftype_t {
  	XFRM_AE_UNSPEC,
  	XFRM_AE_RTHR=1,	/* replay threshold*/
  	XFRM_AE_RVAL=2, /* replay value */
  	XFRM_AE_LVAL=4, /* lifetime value */
  	XFRM_AE_ETHR=8, /* expiry timer threshold */
  	XFRM_AE_CR=16, /* Event cause is replay update */
  	XFRM_AE_CE=32, /* Event cause is timer expiry */
  	XFRM_AE_CU=64, /* Event cause is policy update */
  	__XFRM_AE_MAX
  
  #define XFRM_AE_MAX (__XFRM_AE_MAX - 1)
  };

  struct xfrm_userpolicy_type {
  	__u8		type;
  	__u16		reserved1;
  	__u8		reserved2;
  };

  /* 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_SA,
  	XFRMA_POLICY,

  	XFRMA_SEC_CTX,		/* struct xfrm_sec_ctx */

  	XFRMA_LTIME_VAL,
  	XFRMA_REPLAY_VAL,
  	XFRMA_REPLAY_THRESH,
  	XFRMA_ETIMER_THRESH,

  	XFRMA_SRCADDR,		/* xfrm_address_t */

  	XFRMA_COADDR,		/* xfrm_address_t */

  	XFRMA_LASTUSED,

  	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */

  	XFRMA_MIGRATE,

  	__XFRMA_MAX
  
  #define XFRMA_MAX (__XFRMA_MAX - 1)
  };

  enum xfrm_sadattr_type_t {
  	XFRMA_SAD_UNSPEC,

  	XFRMA_SAD_CNT,
  	XFRMA_SAD_HINFO,

  	__XFRMA_SAD_MAX
  
  #define XFRMA_SAD_MAX (__XFRMA_SAD_MAX - 1)
  };

  struct xfrmu_sadhinfo {
  	__u32 sadhcnt; /* current hash bkts */
  	__u32 sadhmcnt; /* max allowed hash bkts */
  };

  enum xfrm_spdattr_type_t {
  	XFRMA_SPD_UNSPEC,

  	XFRMA_SPD_INFO,
  	XFRMA_SPD_HINFO,

  	__XFRMA_SPD_MAX
  
  #define XFRMA_SPD_MAX (__XFRMA_SPD_MAX - 1)
  };

  struct xfrmu_spdinfo {
  	__u32 incnt;
  	__u32 outcnt;
  	__u32 fwdcnt;
  	__u32 inscnt;
  	__u32 outscnt;
  	__u32 fwdscnt;
  };
  
  struct xfrmu_spdhinfo {
  	__u32 spdhcnt;
  	__u32 spdhmcnt;
  };

  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;		/* XFRM_MODE_xxx */

  	__u8				replay_window;
  	__u8				flags;
  #define XFRM_STATE_NOECN	1
  #define XFRM_STATE_DECAP_DSCP	2

  #define XFRM_STATE_NOPMTUDISC	4

  #define XFRM_STATE_WILDRECV	8

  };
  
  struct xfrm_usersa_id {
  	xfrm_address_t			daddr;

  	__be32				spi;

  	__u16				family;
  	__u8				proto;
  };

  struct xfrm_aevent_id {

  	struct xfrm_usersa_id		sa_id;

  	xfrm_address_t			saddr;

  	__u32				flags;

  	__u32				reqid;

  };

  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;
  };

  struct xfrm_user_report {
  	__u8				proto;
  	struct xfrm_selector		sel;
  };

  struct xfrm_user_migrate {
  	xfrm_address_t			old_daddr;
  	xfrm_address_t			old_saddr;
  	xfrm_address_t			new_daddr;
  	xfrm_address_t			new_saddr;
  	__u8				proto;
  	__u8				mode;
  	__u16				reserved;
  	__u32				reqid;
  	__u16				old_family;
  	__u16				new_family;
  };

  #ifndef __KERNEL__
  /* backwards compatibility for userspace */

  #define XFRMGRP_ACQUIRE		1
  #define XFRMGRP_EXPIRE		2

  #define XFRMGRP_SA		4
  #define XFRMGRP_POLICY		8

  #define XFRMGRP_REPORT		0x20

  #endif
  
  enum xfrm_nlgroups {
  	XFRMNLGRP_NONE,
  #define XFRMNLGRP_NONE		XFRMNLGRP_NONE
  	XFRMNLGRP_ACQUIRE,
  #define XFRMNLGRP_ACQUIRE	XFRMNLGRP_ACQUIRE
  	XFRMNLGRP_EXPIRE,
  #define XFRMNLGRP_EXPIRE	XFRMNLGRP_EXPIRE
  	XFRMNLGRP_SA,
  #define XFRMNLGRP_SA		XFRMNLGRP_SA
  	XFRMNLGRP_POLICY,
  #define XFRMNLGRP_POLICY	XFRMNLGRP_POLICY

  	XFRMNLGRP_AEVENTS,
  #define XFRMNLGRP_AEVENTS	XFRMNLGRP_AEVENTS

  	XFRMNLGRP_REPORT,
  #define XFRMNLGRP_REPORT	XFRMNLGRP_REPORT

  	XFRMNLGRP_MIGRATE,
  #define XFRMNLGRP_MIGRATE	XFRMNLGRP_MIGRATE

  	__XFRMNLGRP_MAX
  };
  #define XFRMNLGRP_MAX	(__XFRMNLGRP_MAX - 1)

  
  #endif /* _LINUX_XFRM_H */