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

     /*      $FreeBSD: releng/10.0/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_ */

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