FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform.h

     /*      $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_ */

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