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/* $FreeBSD: release/9.1.0/sys/netipsec/xform.h 220206 2011-03-31 15:23:32Z fabient $ */
/* $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $ */
/*-
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr),
* Niels Provos (provos@physnet.uni-hamburg.de) and
* Niklas Hallqvist (niklas@appli.se).
*
* The original version of this code was written by John Ioannidis
* for BSD/OS in Athens, Greece, in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
*
* Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
* Copyright (c) 1999 Niklas Hallqvist.
* Copyright (c) 2001, Angelos D. Keromytis.
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#ifndef _NETIPSEC_XFORM_H_
#define _NETIPSEC_XFORM_H_
#include <sys/types.h>
#include <netinet/in.h>
#include <opencrypto/xform.h>
#define AH_HMAC_HASHLEN 12 /* 96 bits of authenticator */
#define AH_HMAC_MAXHASHLEN (SHA2_512_HASH_LEN/2) /* Keep this updated */
#define AH_HMAC_INITIAL_RPL 1 /* replay counter initial value */
/*
* Packet tag assigned on completion of IPsec processing; used
* to speedup processing when/if the packet comes back for more
* processing.
*/
struct tdb_ident {
u_int32_t spi;
union sockaddr_union dst;
u_int8_t proto;
/* Cache those two for enc(4) in xform_ipip. */
u_int8_t alg_auth;
u_int8_t alg_enc;
};
/*
* Opaque data structure hung off a crypto operation descriptor.
*/
struct tdb_crypto {
struct ipsecrequest *tc_isr; /* ipsec request state */
u_int32_t tc_spi; /* associated SPI */
union sockaddr_union tc_dst; /* dst addr of packet */
u_int8_t tc_proto; /* current protocol, e.g. AH */
u_int8_t tc_nxt; /* next protocol, e.g. IPV4 */
int tc_protoff; /* current protocol offset */
int tc_skip; /* data offset */
caddr_t tc_ptr; /* associated crypto data */
struct secasvar *tc_sav; /* related SA */
};
struct secasvar;
struct ipescrequest;
struct xformsw {
u_short xf_type; /* xform ID */
#define XF_IP4 1 /* IP inside IP */
#define XF_AH 2 /* AH */
#define XF_ESP 3 /* ESP */
#define XF_TCPSIGNATURE 5 /* TCP MD5 Signature option, RFC 2358 */
#define XF_IPCOMP 6 /* IPCOMP */
u_short xf_flags;
#define XFT_AUTH 0x0001
#define XFT_CONF 0x0100
#define XFT_COMP 0x1000
char *xf_name; /* human-readable name */
int (*xf_init)(struct secasvar*, struct xformsw*); /* setup */
int (*xf_zeroize)(struct secasvar*); /* cleanup */
int (*xf_input)(struct mbuf*, struct secasvar*, /* input */
int, int);
int (*xf_output)(struct mbuf*, /* output */
struct ipsecrequest *, struct mbuf **, int, int);
struct xformsw *xf_next; /* list of registered xforms */
};
#ifdef _KERNEL
extern void xform_register(struct xformsw*);
extern int xform_init(struct secasvar *sav, int xftype);
struct cryptoini;
/* XF_IP4 */
extern int ip4_input6(struct mbuf **m, int *offp, int proto);
extern void ip4_input(struct mbuf *m, int);
extern int ipip_output(struct mbuf *, struct ipsecrequest *,
struct mbuf **, int, int);
/* XF_AH */
extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
extern int ah_zeroize(struct secasvar *sav);
extern struct auth_hash *ah_algorithm_lookup(int alg);
extern size_t ah_hdrsiz(struct secasvar *);
/* XF_ESP */
extern struct enc_xform *esp_algorithm_lookup(int alg);
extern size_t esp_hdrsiz(struct secasvar *sav);
/* XF_COMP */
extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
#endif /* _KERNEL */
#endif /* _NETIPSEC_XFORM_H_ */