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 /*      $FreeBSD: releng/11.0/sys/netipsec/xform.h 286000 2015-07-29 07:15:16Z jmg $    */
    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_MAXHASHLEN      (SHA2_512_HASH_LEN/2)   /* Keep this updated */
   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         /* Cache those two for enc(4) in xform_ipip. */
   62         u_int8_t alg_auth;
   63         u_int8_t alg_enc;
   64 };
   65 
   66 /*
   67  * Opaque data structure hung off a crypto operation descriptor.
   68  */
   69 struct tdb_crypto {
   70         struct ipsecrequest     *tc_isr;        /* ipsec request state */
   71         u_int32_t               tc_spi;         /* associated SPI */
   72         union sockaddr_union    tc_dst;         /* dst addr of packet */
   73         u_int8_t                tc_proto;       /* current protocol, e.g. AH */
   74         u_int8_t                tc_nxt;         /* next protocol, e.g. IPV4 */
   75         int                     tc_protoff;     /* current protocol offset */
   76         int                     tc_skip;        /* data offset */
   77         caddr_t                 tc_ptr;         /* associated crypto data */
   78         struct secasvar         *tc_sav;        /* related SA */
   79 };
   80 
   81 struct secasvar;
   82 struct ipescrequest;
   83 
   84 struct xformsw {
   85         u_short xf_type;                /* xform ID */
   86 #define XF_IP4          1       /* unused */
   87 #define XF_AH           2       /* AH */
   88 #define XF_ESP          3       /* ESP */
   89 #define XF_TCPSIGNATURE 5       /* TCP MD5 Signature option, RFC 2358 */
   90 #define XF_IPCOMP       6       /* IPCOMP */
   91         u_short xf_flags;
   92 #define XFT_AUTH        0x0001
   93 #define XFT_CONF        0x0100
   94 #define XFT_COMP        0x1000
   95         char    *xf_name;                       /* human-readable name */
   96         int     (*xf_init)(struct secasvar*, struct xformsw*);  /* setup */
   97         int     (*xf_zeroize)(struct secasvar*);                /* cleanup */
   98         int     (*xf_input)(struct mbuf*, struct secasvar*,     /* input */
   99                         int, int);
  100         int     (*xf_output)(struct mbuf*,                      /* output */
  101                         struct ipsecrequest *, struct mbuf **, int, int);
  102         struct xformsw *xf_next;                /* list of registered xforms */
  103 };
  104 
  105 #ifdef _KERNEL
  106 extern void xform_register(struct xformsw*);
  107 extern int xform_init(struct secasvar *sav, int xftype);
  108 extern int xform_ah_authsize(struct auth_hash *esph);
  109 
  110 struct cryptoini;
  111 
  112 /* XF_AH */
  113 extern int ah_init0(struct secasvar *, struct xformsw *, struct cryptoini *);
  114 extern int ah_zeroize(struct secasvar *sav);
  115 extern struct auth_hash *ah_algorithm_lookup(int alg);
  116 extern size_t ah_hdrsiz(struct secasvar *);
  117 
  118 /* XF_ESP */
  119 extern struct enc_xform *esp_algorithm_lookup(int alg);
  120 extern size_t esp_hdrsiz(struct secasvar *sav);
  121 
  122 /* XF_COMP */
  123 extern struct comp_algo *ipcomp_algorithm_lookup(int alg);
  124 
  125 #endif /* _KERNEL */
  126 #endif /* _NETIPSEC_XFORM_H_ */

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