usr/src/uts/common/sys/socket_impl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * Portions of this source code were derived from Berkeley 4.3 BSD
  32  * under license from the Regents of the University of California.
  33  */
  34
  35 #ifndef _SYS_SOCKET_IMPL_H
  36 #define _SYS_SOCKET_IMPL_H
  37
  38 #pragma ident   "%Z%%M% %I%     %E% SMI"
  39
  40 #ifdef  __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 #ifndef _SA_FAMILY_T
  45 #define _SA_FAMILY_T
  46 typedef uint16_t        sa_family_t;
  47 #endif
  48
  49 /*
  50  * Structure used by kernel to store most
  51  * addresses.
  52  */
  53 struct sockaddr {
  54         sa_family_t     sa_family;      /* address family */
  55         char            sa_data[14];    /* up to 14 bytes of direct address */
  56 };
  57
  58 #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  59 #include <sys/un.h>
  60 #include <net/if_dl.h>
  61 #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
  62
  63 #if !defined(_XPG4_2) || defined(_XPG6) || defined(__EXTENSIONS__)
  64 /*
  65  * sockaddr_storage:
  66  * Common superset of at least AF_INET, AF_INET6 and AF_LINK sockaddr
  67  * structures. Has sufficient size and alignment for those sockaddrs.
  68  */
  69
  70 /*
  71  * Desired maximum size, alignment size and related types.
  72  */
  73 #define _SS_MAXSIZE     256     /* Implementation specific max size */
  74
  75 /*
  76  * To represent desired sockaddr max alignment for platform, a
  77  * type is chosen which may depend on implementation platform architecture.
  78  * Type chosen based on alignment size restrictions from <sys/isa_defs.h>.
  79  * We desire to force up to (but no more than) 64-bit (8 byte) alignment,
  80  * on platforms where it is possible to do so. (e.g not possible on ia32).
  81  * For all currently supported platforms by our implementation
  82  * in <sys/isa_defs.h>, (i.e. sparc, sparcv9, ia32, ia64)
  83  * type "double" is suitable for that intent.
  84  *
  85  * Note: Type "double" is chosen over the more obvious integer type int64_t.
  86  *   int64_t is not a valid type for strict ANSI/ISO C compilation on ILP32.
  87  */
  88 typedef double          sockaddr_maxalign_t;
  89
  90 #define _SS_ALIGNSIZE   (sizeof (sockaddr_maxalign_t))
  91
  92 /*
  93  * Definitions used for sockaddr_storage structure paddings design.
  94  */
  95 #define _SS_PAD1SIZE    (_SS_ALIGNSIZE - sizeof (sa_family_t))
  96 #define _SS_PAD2SIZE    (_SS_MAXSIZE - (sizeof (sa_family_t)+ \
  97                         _SS_PAD1SIZE + _SS_ALIGNSIZE))
  98
  99 struct sockaddr_storage {
 100         sa_family_t     ss_family;      /* Address family */
 101         /* Following fields are implementation specific */
 102         char            _ss_pad1[_SS_PAD1SIZE];
 103         sockaddr_maxalign_t _ss_align;
 104         char            _ss_pad2[_SS_PAD2SIZE];
 105 };
 106 #endif  /* !defined(_XPG4_2) || defined(_XPG6) || defined(__EXTENSIONS__) */
 107
 108 #ifdef  __cplusplus
 109 }
 110 #endif
 111
 112 #endif  /* _SYS_SOCKET_IMPL_H */