/*      $NetBSD: xform.h,v 1.22 2022/05/22 11:39:08 riastradh Exp $     */
/*      $FreeBSD: xform.h,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $       */
/*      $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>

/*
 * Opaque data structure hung off a crypto operation descriptor.
 */
struct secasvar;
struct tdb_crypto {
        const 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 */
        int                     tc_flags;       /* outer protocol flags, e.g. IPV6_MINMTU */
        struct secasvar         *tc_sav;        /* ipsec SA */
};

struct ipescrequest;

struct xformsw {
        u_short xf_type;
#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
        const char *xf_name;
        int (*xf_init)(struct secasvar *, const struct xformsw *);
        void (*xf_zeroize)(struct secasvar *);
        int (*xf_input)(struct mbuf *, struct secasvar *, int, int);
        int (*xf_output)(struct mbuf *, const struct ipsecrequest *,
            struct secasvar *, int, int, int);
        struct xformsw *xf_next;        /* list of registered xforms */
};

#ifdef _KERNEL
void xform_register(struct xformsw *);
int xform_init(struct secasvar *sav, int);

struct cryptoini;

/* XF_IP4 */
int ipip_output(struct mbuf *, struct secasvar *, struct mbuf **);

/* XF_AH */
int ah_init0(struct secasvar *, const struct xformsw *, struct cryptoini *);
void ah_zeroize(struct secasvar *);
const struct auth_hash *ah_algorithm_lookup(int);
size_t ah_authsiz(const struct secasvar *);
size_t ah_hdrsiz(const struct secasvar *);

/* XF_ESP */
const struct enc_xform *esp_algorithm_lookup(int);
size_t esp_hdrsiz(const struct secasvar *);

/* XF_COMP */
const struct comp_algo *ipcomp_algorithm_lookup(int);

#endif /* _KERNEL */
#endif /* !_NETIPSEC_XFORM_H_ */