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

     /*      $FreeBSD: releng/12.0/sys/netipsec/xform.h 338945 2018-09-26 14:47:51Z ae $     */
     /*      $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 <sys/queue.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 */
    
    #ifdef _KERNEL
    struct secpolicy;
    struct secasvar;
    
    /*
     * Packet tag assigned on completion of IPsec processing; used
     * to speedup security policy checking for INBOUND packets.
     */
    struct xform_history {
            union sockaddr_union    dst;            /* destination address */
            uint32_t                spi;            /* Security Parameters Index */
            uint8_t                 proto;          /* IPPROTO_ESP or IPPROTO_AH */
            uint8_t                 mode;           /* transport or tunnel */
    };
    
    /*
     * Opaque data structure hung off a crypto operation descriptor.
     */
    struct xform_data {
            struct secpolicy        *sp;            /* security policy */
            struct secasvar         *sav;           /* related SA */
            crypto_session_t        cryptoid;       /* used crypto session */
            u_int                   idx;            /* IPsec request index */
            int                     protoff;        /* current protocol offset */
            int                     skip;           /* data offset */
            uint8_t                 nxt;            /* next protocol, e.g. IPV4 */
            struct vnet             *vnet;
    };
    
    #define XF_IP4          1       /* unused */
    #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 */
    
    struct xformsw {
            u_short                 xf_type;        /* xform ID */
            const 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 secpolicy *, struct secasvar *, u_int, int, int);
    
            volatile u_int          xf_cntr;
            LIST_ENTRY(xformsw)     chain;
   };
   
   const struct enc_xform * enc_algorithm_lookup(int);
   const struct auth_hash * auth_algorithm_lookup(int);
   const struct comp_algo * comp_algorithm_lookup(int);
   
   void xform_attach(void *);
   void xform_detach(void *);
   int xform_init(struct secasvar *, u_short);
   
   struct cryptoini;
   /* XF_AH */
   int xform_ah_authsize(const struct auth_hash *);
   extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
   extern int ah_zeroize(struct secasvar *sav);
   extern size_t ah_hdrsiz(struct secasvar *);
   
   /* XF_ESP */
   extern size_t esp_hdrsiz(struct secasvar *sav);
   
   #endif /* _KERNEL */
   #endif /* _NETIPSEC_XFORM_H_ */

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