freebsd-skq/sys/netinet6/ipsec.h

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

/*
 * IPsec controller part.
 */

#ifndef _NETINET6_IPSEC_H_
#define _NETINET6_IPSEC_H_

#include <net/pfkeyv2.h>
#include <netkey/keydb.h>

#ifdef _KERNEL

/*
 * Security Policy Index
 * NOTE: Encure to be same address family and upper layer protocol.
 * NOTE: ul_proto, port number, uid, gid:
 *	ANY: reserved for waldcard.
 *	0 to (~0 - 1): is one of the number of each value.
 */
struct secpolicyindex {
	u_int8_t	dir;			/* direction of packet flow, see blow */
	struct	sockaddr_storage src;	/* IP src address for SP */
	struct	sockaddr_storage dst;	/* IP dst address for SP */
	u_int8_t	prefs;		/* prefix length in bits for src */
	u_int8_t	prefd;		/* prefix length in bits for dst */
	u_int16_t	ul_proto;	/* upper layer Protocol */
};

/* Security Policy Data Base */
struct secpolicy {
	LIST_ENTRY(secpolicy) chain;

	int	refcnt;			/* reference count */
	struct secpolicyindex spidx;	/* selector */
	u_int	state;			/* 0: dead, others: alive */
#define	IPSEC_SPSTATE_DEAD	0
#define	IPSEC_SPSTATE_ALIVE	1

	u_int	policy;		/* DISCARD, NONE or IPSEC, see keyv2.h */
	struct	ipsecrequest *req;
				/* pointer to the ipsec request tree, */
				/* if policy == IPSEC else this value == NULL.*/
};

/* Request for IPsec */
struct ipsecrequest {
	struct	ipsecrequest *next;
				/* pointer to next structure */
				/* If NULL, it means the end of chain. */
	struct	secasindex saidx;
	u_int	level;		/* IPsec level defined below. */

	struct	secasvar *sav;	/* place holder of SA for use */
	struct	secpolicy *sp;	/* back pointer to SP */
};

/* security policy in PCB */
struct inpcbpolicy {
	struct	secpolicy *sp_in;
	struct	secpolicy *sp_out;
	int	priv;			/* privileged socket ? */
};
#endif /*_KERNEL*/

#define	IPSEC_PORT_ANY		65535
#define	IPSEC_ULPROTO_ANY	255
#define	IPSEC_PROTO_ANY		65535

/* mode of security protocol */
/* NOTE: DON'T use IPSEC_MODE_ANY at SPD.  It's only use in SAD */
#define	IPSEC_MODE_ANY		0	/* i.e. wildcard. */
#define	IPSEC_MODE_TRANSPORT	1
#define	IPSEC_MODE_TUNNEL	2

/*
 * Direction of security policy.
 * NOTE: Since INVALID is used just as flag.
 * The other are used for loop counter too.
 */
#define	IPSEC_DIR_ANY		0
#define	IPSEC_DIR_INBOUND	1
#define	IPSEC_DIR_OUTBOUND	2
#define	IPSEC_DIR_MAX		3
#define	IPSEC_DIR_INVALID	4

/* Policy level */
/*
 * IPSEC, ENTRUST and BYPASS are allowd for setsockopt() in PCB,
 * DISCARD, IPSEC and NONE are allowd for setkey() in SPD.
 * DISCARD and NONE are allowd for system default.
 */
#define	IPSEC_POLICY_DISCARD	0	/* discarding packet */
#define	IPSEC_POLICY_NONE	1	/* through IPsec engine */
#define	IPSEC_POLICY_IPSEC	2	/* do IPsec */
#define	IPSEC_POLICY_ENTRUST	3	/* consulting SPD if present. */
#define	IPSEC_POLICY_BYPASS	4	/* only for privileged socket. */

/* Security protocol level */
#define	IPSEC_LEVEL_DEFAULT	0	/* reference to system default */
#define	IPSEC_LEVEL_USE		1	/* use SA if present. */
#define	IPSEC_LEVEL_REQUIRE	2	/* require SA. */
#define	IPSEC_LEVEL_UNIQUE	3	/* unique SA. */

#define IPSEC_REPLAYWSIZE  32

/* statistics for ipsec processing */
struct ipsecstat {
	u_long	in_success;  /* succeeded inbound process */
	u_long	in_polvio;   /* security policy violation for inbound process */
	u_long	in_nosa;     /* inbound SA is unavailable */
	u_long	in_inval;    /* inbound processing failed due to EINVAL */
	u_long	in_badspi;   /* failed getting a SPI */
	u_long	in_ahreplay; /* AH replay check failed */
	u_long	in_espreplay; /* ESP replay check failed */
	u_long	in_ahauthsucc; /* AH authentication success */
	u_long	in_ahauthfail; /* AH authentication failure */
	u_long	in_espauthsucc; /* ESP authentication success */
	u_long	in_espauthfail; /* ESP authentication failure */
	u_long	in_esphist[SADB_EALG_MAX];
	u_long	in_ahhist[SADB_AALG_MAX];
	u_long	out_success; /* succeeded outbound process */
	u_long	out_polvio;  /* security policy violation for outbound process */
	u_long	out_nosa;    /* outbound SA is unavailable */
	u_long	out_inval;   /* outbound process failed due to EINVAL */
	u_long	out_noroute; /* there is no route */
	u_long	out_esphist[SADB_EALG_MAX];
	u_long	out_ahhist[SADB_AALG_MAX];
};

/*
 * Definitions for IPsec & Key sysctl operations.
 */
/*
 * Names for IPsec & Key sysctl objects
 */
#define	IPSECCTL_STATS			1	/* stats */
#define	IPSECCTL_DEF_POLICY		2
#define	IPSECCTL_DEF_ESP_TRANSLEV	3	/* int; ESP transport mode */
#define	IPSECCTL_DEF_ESP_NETLEV		4	/* int; ESP tunnel mode */
#define	IPSECCTL_DEF_AH_TRANSLEV	5	/* int; AH transport mode */
#define	IPSECCTL_DEF_AH_NETLEV		6	/* int; AH tunnel mode */
#define	IPSECCTL_INBOUND_CALL_IKE	7
#define	IPSECCTL_AH_CLEARTOS		8
#define	IPSECCTL_AH_OFFSETMASK		9
#define	IPSECCTL_DFBIT			10
#define	IPSECCTL_ECN			11
#define	IPSECCTL_MAXID			12

#define IPSECCTL_NAMES { \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "def_policy", CTLTYPE_INT }, \
	{ "esp_trans_deflev", CTLTYPE_INT }, \
	{ "esp_net_deflev", CTLTYPE_INT }, \
	{ "ah_trans_deflev", CTLTYPE_INT }, \
	{ "ah_net_deflev", CTLTYPE_INT }, \
	{ "inbound_call_ike", CTLTYPE_INT }, \
	{ "ah_cleartos", CTLTYPE_INT }, \
	{ "ah_offsetmask", CTLTYPE_INT }, \
	{ "dfbit", CTLTYPE_INT }, \
	{ "ecn", CTLTYPE_INT }, \
}

#define IPSEC6CTL_NAMES { \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "def_policy", CTLTYPE_INT }, \
	{ "esp_trans_deflev", CTLTYPE_INT }, \
	{ "esp_net_deflev", CTLTYPE_INT }, \
	{ "ah_trans_deflev", CTLTYPE_INT }, \
	{ "ah_net_deflev", CTLTYPE_INT }, \
	{ "inbound_call_ike", CTLTYPE_INT }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "ecn", CTLTYPE_INT }, \
}

#define IPSECCTL_VARS { \
	0, \
	0, \
	&ip4_def_policy.policy, \
	&ip4_esp_trans_deflev, \
	&ip4_esp_net_deflev, \
	&ip4_ah_trans_deflev, \
	&ip4_ah_net_deflev, \
	&ip4_inbound_call_ike, \
	&ip4_ah_cleartos, \
	&ip4_ah_offsetmask, \
	&ip4_ipsec_dfbit, \
	&ip4_ipsec_ecn, \
}

#define IPSEC6CTL_VARS { \
	0, \
	0, \
	&ip6_def_policy.policy, \
	&ip6_esp_trans_deflev, \
	&ip6_esp_net_deflev, \
	&ip6_ah_trans_deflev, \
	&ip6_ah_net_deflev, \
	&ip6_inbound_call_ike, \
	0, \
	0, \
	0, \
	&ip6_ipsec_ecn, \
}

#ifdef _KERNEL

#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_inet_ipsec);
#endif

struct ipsec_output_state {
	struct	mbuf *m;
	struct	route *ro;
	struct	sockaddr *dst;
};

extern struct	ipsecstat ipsecstat;
extern struct	secpolicy ip4_def_policy;
extern int	ip4_esp_trans_deflev;
extern int	ip4_esp_net_deflev;
extern int	ip4_ah_trans_deflev;
extern int	ip4_ah_net_deflev;
extern int	ip4_inbound_call_ike;
extern int	ip4_ah_cleartos;
extern int	ip4_ah_offsetmask;
extern int	ip4_ipsec_dfbit;
extern int	ip4_ipsec_ecn;

extern struct	secpolicy *ipsec4_getpolicybysock
	__P((struct mbuf *, u_int, struct socket *, int *));
extern struct	secpolicy *ipsec4_getpolicybyaddr
	__P((struct mbuf *, u_int, int, int *));

struct	inpcb;

extern int	ipsec_init_policy __P((struct socket *so, struct inpcbpolicy **));
extern int	ipsec_copy_policy
	__P((struct inpcbpolicy *, struct inpcbpolicy *));
extern u_int	ipsec_get_reqlevel __P((struct ipsecrequest *));

extern int	ipsec4_set_policy __P((struct inpcb *inp, int optname,
				       caddr_t request, int priv));
extern int	ipsec4_get_policy
	__P((struct inpcb *inpcb, caddr_t request, struct mbuf **mp));
extern int	ipsec4_delete_pcbpolicy __P((struct inpcb *));
extern int	ipsec4_in_reject_so __P((struct mbuf *, struct socket *));
extern int	ipsec4_in_reject __P((struct mbuf *, struct inpcb *));

struct	secas;
struct	tcpcb;
struct	tcp6cb;
extern int	ipsec_chkreplay __P((u_int32_t, struct secasvar *));
extern int	ipsec_updatereplay __P((u_int32_t, struct secasvar *));

extern size_t	ipsec4_hdrsiz __P((struct mbuf *, u_int, struct inpcb *));
extern size_t	ipsec_hdrsiz_tcp __P((struct tcpcb *));

struct	ip;

extern const char	*ipsec4_logpacketstr __P((struct ip *, u_int32_t));
extern const char	*ipsec_logsastr __P((struct secasvar *));

extern void	ipsec_dumpmbuf __P((struct mbuf *));

extern int	ipsec4_output __P((struct ipsec_output_state *, struct secpolicy *,
	int));

extern int	ipsec4_tunnel_validate __P((struct ip *, u_int,
					    struct secasvar *));

extern struct	mbuf *ipsec_copypkt __P((struct mbuf *));

#endif /*_KERNEL*/

#ifndef _KERNEL

extern caddr_t	 ipsec_set_policy __P((char *policy, int buflen));
extern int	 ipsec_get_policylen __P((caddr_t buf));
extern char	*ipsec_dump_policy __P((caddr_t buf, char *delimiter));

extern char	*ipsec_strerror __P((void));
#endif /*!_KERNEL*/

#endif /*_NETINET6_IPSEC_H_*/