sys/netproto/ipsec/xform.h

   1 /*      $FreeBSD: src/sys/netipsec/xform.h,v 1.1.4.1 2003/01/24 05:11:36 sam Exp $      */
   2 /*      $DragonFly: src/sys/netproto/ipsec/xform.h,v 1.2 2003/06/17 04:28:53 dillon 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         caddr_t                 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         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 **mp, int *offp, int proto);
 109 extern  int ip4_input(struct mbuf **mp, int *offp, int proto);
 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_ */