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      1 /*	$NetBSD: xform.h,v 1.22 2022/05/22 11:39:08 riastradh Exp $	*/
      2 /*	$FreeBSD: xform.h,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $	*/
      3 /*	$OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $	*/
      4 /*
      5  * The authors of this code are John Ioannidis (ji (at) tla.org),
      6  * Angelos D. Keromytis (kermit (at) csd.uch.gr),
      7  * Niels Provos (provos (at) physnet.uni-hamburg.de) and
      8  * Niklas Hallqvist (niklas (at) appli.se).
      9  *
     10  * The original version of this code was written by John Ioannidis
     11  * for BSD/OS in Athens, Greece, in November 1995.
     12  *
     13  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
     14  * by Angelos D. Keromytis.
     15  *
     16  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
     17  * and Niels Provos.
     18  *
     19  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
     20  *
     21  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
     22  * Angelos D. Keromytis and Niels Provos.
     23  * Copyright (c) 1999 Niklas Hallqvist.
     24  * Copyright (c) 2001, Angelos D. Keromytis.
     25  *
     26  * Permission to use, copy, and modify this software with or without fee
     27  * is hereby granted, provided that this entire notice is included in
     28  * all copies of any software which is or includes a copy or
     29  * modification of this software.
     30  * You may use this code under the GNU public license if you so wish. Please
     31  * contribute changes back to the authors under this freer than GPL license
     32  * so that we may further the use of strong encryption without limitations to
     33  * all.
     34  *
     35  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
     36  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
     37  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
     38  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
     39  * PURPOSE.
     40  */
     41 
     42 #ifndef _NETIPSEC_XFORM_H_
     43 #define _NETIPSEC_XFORM_H_
     44 
     45 #include <sys/types.h>
     46 #include <netinet/in.h>
     47 #include <opencrypto/xform.h>
     48 
     49 /*
     50  * Opaque data structure hung off a crypto operation descriptor.
     51  */
     52 struct secasvar;
     53 struct tdb_crypto {
     54 	const struct ipsecrequest *tc_isr;	/* ipsec request state */
     55 	u_int32_t		tc_spi;		/* associated SPI */
     56 	union sockaddr_union	tc_dst;		/* dst addr of packet */
     57 	u_int8_t		tc_proto;	/* current protocol, e.g. AH */
     58 	u_int8_t		tc_nxt;		/* next protocol, e.g. IPV4 */
     59 	int			tc_protoff;	/* current protocol offset */
     60 	int			tc_skip;	/* data offset */
     61 	int			tc_flags;	/* outer protocol flags, e.g. IPV6_MINMTU */
     62 	struct secasvar		*tc_sav;	/* ipsec SA */
     63 };
     64 
     65 struct ipescrequest;
     66 
     67 struct xformsw {
     68 	u_short xf_type;
     69 #define	XF_IP4		1	/* IP inside IP */
     70 #define	XF_AH		2	/* AH */
     71 #define	XF_ESP		3	/* ESP */
     72 #define	XF_TCPSIGNATURE	5	/* TCP MD5 Signature option, RFC 2358 */
     73 #define	XF_IPCOMP	6	/* IPCOMP */
     74 	u_short xf_flags;
     75 #define	XFT_AUTH	0x0001
     76 #define	XFT_CONF	0x0100
     77 #define	XFT_COMP	0x1000
     78 	const char *xf_name;
     79 	int (*xf_init)(struct secasvar *, const struct xformsw *);
     80 	void (*xf_zeroize)(struct secasvar *);
     81 	int (*xf_input)(struct mbuf *, struct secasvar *, int, int);
     82 	int (*xf_output)(struct mbuf *, const struct ipsecrequest *,
     83 	    struct secasvar *, int, int, int);
     84 	struct xformsw *xf_next;	/* list of registered xforms */
     85 };
     86 
     87 #ifdef _KERNEL
     88 void xform_register(struct xformsw *);
     89 int xform_init(struct secasvar *sav, int);
     90 
     91 struct cryptoini;
     92 
     93 /* XF_IP4 */
     94 int ipip_output(struct mbuf *, struct secasvar *, struct mbuf **);
     95 
     96 /* XF_AH */
     97 int ah_init0(struct secasvar *, const struct xformsw *, struct cryptoini *);
     98 void ah_zeroize(struct secasvar *);
     99 const struct auth_hash *ah_algorithm_lookup(int);
    100 size_t ah_authsiz(const struct secasvar *);
    101 size_t ah_hdrsiz(const struct secasvar *);
    102 
    103 /* XF_ESP */
    104 const struct enc_xform *esp_algorithm_lookup(int);
    105 size_t esp_hdrsiz(const struct secasvar *);
    106 
    107 /* XF_COMP */
    108 const struct comp_algo *ipcomp_algorithm_lookup(int);
    109 
    110 #endif /* _KERNEL */
    111 #endif /* !_NETIPSEC_XFORM_H_ */
    112