The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: xform.h,v 1.4 2007/03/04 06:03:30 christos Exp $       */
    2 /*      $FreeBSD: src/sys/netipsec/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@tla.org),
    6  * Angelos D. Keromytis (kermit@csd.uch.gr),
    7  * Niels Provos (provos@physnet.uni-hamburg.de) and
    8  * Niklas Hallqvist (niklas@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 #define AH_HMAC_HASHLEN         12      /* 96 bits of authenticator */
   50 #define AH_HMAC_INITIAL_RPL     1       /* replay counter initial value */
   51 
   52 /*
   53  * Packet tag assigned on completion of IPsec processing; used
   54  * to speedup processing when/if the packet comes back for more
   55  * processing.
   56  */
   57 struct tdb_ident {
   58         u_int32_t spi;
   59         union sockaddr_union dst;
   60         u_int8_t proto;
   61 };
   62 
   63 /*
   64  * Opaque data structure hung off a crypto operation descriptor.
   65  */
   66 struct tdb_crypto {
   67         struct ipsecrequest     *tc_isr;        /* ipsec request state */
   68         u_int32_t               tc_spi;         /* associated SPI */
   69         union sockaddr_union    tc_dst;         /* dst addr of packet */
   70         u_int8_t                tc_proto;       /* current protocol, e.g. AH */
   71         u_int8_t                tc_nxt;         /* next protocol, e.g. IPV4 */
   72         int                     tc_protoff;     /* current protocol offset */
   73         int                     tc_skip;        /* data offset */
   74         void *                  tc_ptr;         /* associated crypto data */
   75 };
   76 
   77 struct secasvar;
   78 struct ipescrequest;
   79 
   80 struct xformsw {
   81         u_short xf_type;                /* xform ID */
   82 #define XF_IP4          1       /* IP inside IP */
   83 #define XF_AH           2       /* AH */
   84 #define XF_ESP          3       /* ESP */
   85 #define XF_TCPSIGNATURE 5       /* TCP MD5 Signature option, RFC 2358 */
   86 #define XF_IPCOMP       6       /* IPCOMP */
   87         u_short xf_flags;
   88 #define XFT_AUTH        0x0001
   89 #define XFT_CONF        0x0100
   90 #define XFT_COMP        0x1000
   91         const char      *xf_name;               /* human-readable name */
   92         int     (*xf_init)(struct secasvar*, struct xformsw*);  /* setup */
   93         int     (*xf_zeroize)(struct secasvar*);                /* cleanup */
   94         int     (*xf_input)(struct mbuf*, struct secasvar*,     /* input */
   95                         int, int);
   96         int     (*xf_output)(struct mbuf*,                      /* output */
   97                         struct ipsecrequest *, struct mbuf **, int, int);
   98         struct xformsw *xf_next;                /* list of registered xforms */
   99 };
  100 
  101 #ifdef _KERNEL
  102 extern void xform_register(struct xformsw*);
  103 extern int xform_init(struct secasvar *sav, int xftype);
  104 
  105 struct cryptoini;
  106 
  107 /* XF_IP4 */
  108 extern  int ip4_input6(struct mbuf **m, int *offp, int proto);
  109 extern  void ip4_input(struct mbuf *m, ...);
  110 extern  int ipip_output(struct mbuf *, struct ipsecrequest *,
  111                         struct mbuf **, int, int);
  112 
  113 /* XF_AH */
  114 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
  115 extern int ah_zeroize(struct secasvar *sav);
  116 extern struct auth_hash *ah_algorithm_lookup(int alg);
  117 extern size_t ah_hdrsiz(struct secasvar *);
  118 
  119 /* XF_ESP */
  120 extern struct enc_xform *esp_algorithm_lookup(int alg);
  121 extern size_t esp_hdrsiz(struct secasvar *sav);
  122 
  123 /* XF_COMP */
  124 extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
  125 
  126 #endif /* _KERNEL */
  127 #endif /* !_NETIPSEC_XFORM_H_ */

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