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

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    1 /*      $FreeBSD$       */
    2 /*      $OpenBSD: ip_ipsp.h,v 1.119 2002/03/14 01:27:11 millert Exp $   */
    3 /*-
    4  * The authors of this code are John Ioannidis (ji@tla.org),
    5  * Angelos D. Keromytis (kermit@csd.uch.gr),
    6  * Niels Provos (provos@physnet.uni-hamburg.de) and
    7  * Niklas Hallqvist (niklas@appli.se).
    8  *
    9  * The original version of this code was written by John Ioannidis
   10  * for BSD/OS in Athens, Greece, in November 1995.
   11  *
   12  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   13  * by Angelos D. Keromytis.
   14  *
   15  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   16  * and Niels Provos.
   17  *
   18  * Additional features in 1999 by Angelos D. Keromytis and Niklas Hallqvist.
   19  *
   20  * Copyright (c) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   21  * Angelos D. Keromytis and Niels Provos.
   22  * Copyright (c) 1999 Niklas Hallqvist.
   23  * Copyright (c) 2001, Angelos D. Keromytis.
   24  *
   25  * Permission to use, copy, and modify this software with or without fee
   26  * is hereby granted, provided that this entire notice is included in
   27  * all copies of any software which is or includes a copy or
   28  * modification of this software.
   29  * You may use this code under the GNU public license if you so wish. Please
   30  * contribute changes back to the authors under this freer than GPL license
   31  * so that we may further the use of strong encryption without limitations to
   32  * all.
   33  *
   34  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   35  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   36  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   37  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   38  * PURPOSE.
   39  */
   40 
   41 #ifndef _NETIPSEC_XFORM_H_
   42 #define _NETIPSEC_XFORM_H_
   43 
   44 #include <sys/types.h>
   45 #include <netinet/in.h>
   46 #include <opencrypto/xform.h>
   47 
   48 #define AH_HMAC_HASHLEN         12      /* 96 bits of authenticator */
   49 #define AH_HMAC_INITIAL_RPL     1       /* replay counter initial value */
   50 
   51 /*
   52  * Packet tag assigned on completion of IPsec processing; used
   53  * to speedup processing when/if the packet comes back for more
   54  * processing.
   55  */
   56 struct tdb_ident {
   57         u_int32_t spi;
   58         union sockaddr_union dst;
   59         u_int8_t proto;
   60         /* Cache those two for enc(4) in xform_ipip. */
   61         u_int8_t alg_auth;
   62         u_int8_t alg_enc;
   63 };
   64 
   65 /*
   66  * Opaque data structure hung off a crypto operation descriptor.
   67  */
   68 struct tdb_crypto {
   69         struct ipsecrequest     *tc_isr;        /* ipsec request state */
   70         u_int32_t               tc_spi;         /* associated SPI */
   71         union sockaddr_union    tc_dst;         /* dst addr of packet */
   72         u_int8_t                tc_proto;       /* current protocol, e.g. AH */
   73         u_int8_t                tc_nxt;         /* next protocol, e.g. IPV4 */
   74         int                     tc_protoff;     /* current protocol offset */
   75         int                     tc_skip;        /* data offset */
   76         caddr_t                 tc_ptr;         /* associated crypto data */
   77 };
   78 
   79 struct secasvar;
   80 struct ipescrequest;
   81 
   82 struct xformsw {
   83         u_short xf_type;                /* xform ID */
   84 #define XF_IP4          1       /* IP inside IP */
   85 #define XF_AH           2       /* AH */
   86 #define XF_ESP          3       /* ESP */
   87 #define XF_TCPSIGNATURE 5       /* TCP MD5 Signature option, RFC 2358 */
   88 #define XF_IPCOMP       6       /* IPCOMP */
   89         u_short xf_flags;
   90 #define XFT_AUTH        0x0001
   91 #define XFT_CONF        0x0100
   92 #define XFT_COMP        0x1000
   93         char    *xf_name;                       /* human-readable name */
   94         int     (*xf_init)(struct secasvar*, struct xformsw*);  /* setup */
   95         int     (*xf_zeroize)(struct secasvar*);                /* cleanup */
   96         int     (*xf_input)(struct mbuf*, struct secasvar*,     /* input */
   97                         int, int);
   98         int     (*xf_output)(struct mbuf*,                      /* output */
   99                         struct ipsecrequest *, struct mbuf **, int, int);
  100         struct xformsw *xf_next;                /* list of registered xforms */
  101 };
  102 
  103 #ifdef _KERNEL
  104 extern void xform_register(struct xformsw*);
  105 extern int xform_init(struct secasvar *sav, int xftype);
  106 
  107 struct cryptoini;
  108 
  109 /* XF_IP4 */
  110 extern  int ip4_input6(struct mbuf **m, int *offp, int proto);
  111 extern  void ip4_input(struct mbuf *m, int);
  112 extern  int ipip_output(struct mbuf *, struct ipsecrequest *,
  113                         struct mbuf **, int, int);
  114 
  115 /* XF_AH */
  116 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
  117 extern int ah_zeroize(struct secasvar *sav);
  118 extern struct auth_hash *ah_algorithm_lookup(int alg);
  119 extern size_t ah_hdrsiz(struct secasvar *);
  120 
  121 /* XF_ESP */
  122 extern struct enc_xform *esp_algorithm_lookup(int alg);
  123 extern size_t esp_hdrsiz(struct secasvar *sav);
  124 
  125 /* XF_COMP */
  126 extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
  127 
  128 #endif /* _KERNEL */
  129 #endif /* _NETIPSEC_XFORM_H_ */

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