include/linux/in.h

/* */
This source file includes following definitions.
__ntohl
__constant_ntohl
__ntohs
__constant_ntohs
   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions of the Internet Protocol.
   7  *
   8  * Version:     @(#)in.h        1.0.1   04/21/93
   9  *
  10  * Authors:     Original taken from the GNU Project <netinet/in.h> file.
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *
  13  *              This program is free software; you can redistribute it and/or
  14  *              modify it under the terms of the GNU General Public License
  15  *              as published by the Free Software Foundation; either version
  16  *              2 of the License, or (at your option) any later version.
  17  */
  18 #ifndef _LINUX_IN_H
  19 #define _LINUX_IN_H
  20 
  21 
  22 /* Standard well-defined IP protocols.  */
  23 enum {
  24   IPPROTO_IP = 0,               /* Dummy protocol for TCP               */
  25   IPPROTO_ICMP = 1,             /* Internet Control Message Protocol    */
  26   IPPROTO_GGP = 2,              /* Gateway Protocol (deprecated)        */
  27   IPPROTO_TCP = 6,              /* Transmission Control Protocol        */
  28   IPPROTO_EGP = 8,              /* Exterior Gateway Protocol            */
  29   IPPROTO_PUP = 12,             /* PUP protocol                         */
  30   IPPROTO_UDP = 17,             /* User Datagram Protocol               */
  31   IPPROTO_IDP = 22,             /* XNS IDP protocol                     */
  32 
  33   IPPROTO_RAW = 255,            /* Raw IP packets                       */
  34   IPPROTO_MAX
  35 };
  36 
  37 
  38 /* Internet address. */
  39 struct in_addr {
  40         unsigned long int       s_addr;
  41 };
  42 
  43 
  44 /* Structure describing an Internet (IP) socket address. */
  45 #define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
  46 struct sockaddr_in {
  47   short int             sin_family;     /* Address family               */
  48   unsigned short int    sin_port;       /* Port number                  */
  49   struct in_addr        sin_addr;       /* Internet address             */
  50 
  51   /* Pad to size of `struct sockaddr'. */
  52   unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
  53                         sizeof(unsigned short int) - sizeof(struct in_addr)];
  54 };
  55 #define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */
  56 
  57 
  58 /*
  59  * Definitions of the bits in an Internet address integer.
  60  * On subnets, host and network parts are found according
  61  * to the subnet mask, not these masks.
  62  */
  63 #define IN_CLASSA(a)            ((((long int) (a)) & 0x80000000) == 0)
  64 #define IN_CLASSA_NET           0xff000000
  65 #define IN_CLASSA_NSHIFT        24
  66 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
  67 #define IN_CLASSA_MAX           128
  68 
  69 #define IN_CLASSB(a)            ((((long int) (a)) & 0xc0000000) == 0x80000000)
  70 #define IN_CLASSB_NET           0xffff0000
  71 #define IN_CLASSB_NSHIFT        16
  72 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
  73 #define IN_CLASSB_MAX           65536
  74 
  75 #define IN_CLASSC(a)            ((((long int) (a)) & 0xc0000000) == 0xc0000000)
  76 #define IN_CLASSC_NET           0xffffff00
  77 #define IN_CLASSC_NSHIFT        8
  78 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
  79 
  80 #define IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
  81 #define IN_MULTICAST(a)         IN_CLASSD(a)
  82 
  83 #define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xe0000000) == 0xe0000000)
  84 #define IN_BADCLASS(a)          ((((long int) (a)) & 0xf0000000) == 0xf0000000)
  85 
  86 /* Address to accept any incoming messages. */
  87 #define INADDR_ANY              ((unsigned long int) 0x00000000)
  88 
  89 /* Address to send to all hosts. */
  90 #define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)
  91 
  92 /* Address indicating an error return. */
  93 #define INADDR_NONE             0xffffffff
  94 
  95 /* Network number for local host loopback. */
  96 #define IN_LOOPBACKNET          127
  97 
  98 /* Address to loopback in software to local host.  */
  99 #define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1            */
 100 
 101 
 102 /*
 103  * Options for use with `getsockopt' and `setsockopt' at
 104  * the IP level.  LINUX does not yet have the IP_OPTIONS
 105  * option (grin), so we undefine it for now.- HJ && FvK
 106  */
 107 #if 0
 108 # define IP_OPTIONS     1               /* IP per-packet options        */
 109 #endif
 110 #define IP_HDRINCL      2               /* raw packet header option     */
 111 
 112 
 113 /* Linux Internet number representation function declarations. */
 114 #undef ntohl
 115 #undef ntohs
 116 #undef htonl
 117 #undef htons
 118 
 119 extern unsigned long int        ntohl(unsigned long int);
 120 extern unsigned short int       ntohs(unsigned short int);
 121 extern unsigned long int        htonl(unsigned long int);
 122 extern unsigned short int       htons(unsigned short int);
 123 
 124 static __inline__ unsigned long int
 125 __ntohl(unsigned long int x)
     /*  */
 126 {
 127         __asm__("xchgb %b0,%h0\n\t"     /* swap lower bytes     */
 128                 "rorl $16,%0\n\t"       /* swap words           */
 129                 "xchgb %b0,%h0"         /* swap higher bytes    */
 130                 :"=q" (x)
 131                 : "0" (x));
 132         return x;
 133 }
 134 
 135 static __inline__ unsigned long int
 136 __constant_ntohl(unsigned long int x)
     /*  */
 137 {
 138         return (((x & 0x000000ffU) << 24) |
 139                 ((x & 0x0000ff00U) <<  8) |
 140                 ((x & 0x00ff0000U) >>  8) |
 141                 ((x & 0xff000000U) >> 24));
 142 }
 143 
 144 static __inline__ unsigned short int
 145 __ntohs(unsigned short int x)
     /*  */
 146 {
 147         __asm__("xchgb %b0,%h0"         /* swap bytes           */
 148                 : "=q" (x)
 149                 :  "0" (x));
 150         return x;
 151 }
 152 
 153 static __inline__ unsigned short int
 154 __constant_ntohs(unsigned short int x)
     /*  */
 155 {
 156         return (((x & 0x00ff) << 8) |
 157                 ((x & 0xff00) >> 8));
 158 }
 159 
 160 #define __htonl(x) __ntohl(x)
 161 #define __htons(x) __ntohs(x)
 162 #define __constant_htonl(x) __constant_ntohl(x)
 163 #define __constant_htons(x) __constant_ntohs(x)
 164 
 165 #ifdef  __OPTIMIZE__
 166 #  define ntohl(x) \
 167 (__builtin_constant_p((long)(x)) ? \
 168  __constant_ntohl((x)) : \
 169  __ntohl((x)))
 170 #  define ntohs(x) \
 171 (__builtin_constant_p((short)(x)) ? \
 172  __constant_ntohs((x)) : \
 173  __ntohs((x)))
 174 #  define htonl(x) \
 175 (__builtin_constant_p((long)(x)) ? \
 176  __constant_htonl((x)) : \
 177  __htonl((x)))
 178 #  define htons(x) \
 179 (__builtin_constant_p((short)(x)) ? \
 180  __constant_htons((x)) : \
 181  __htons((x)))
 182 #endif
 183 
 184 #endif  /* _LINUX_IN_H */
/* */
root/include/linux/in.h

INCLUDED FROM

DEFINITIONS
