linux/include/linux/in.h
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   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#include <linux/errno.h>
  23#include <uapi/linux/in.h>
  24
  25static inline int proto_ports_offset(int proto)
  26{
  27        switch (proto) {
  28        case IPPROTO_TCP:
  29        case IPPROTO_UDP:
  30        case IPPROTO_DCCP:
  31        case IPPROTO_ESP:       /* SPI */
  32        case IPPROTO_SCTP:
  33        case IPPROTO_UDPLITE:
  34                return 0;
  35        case IPPROTO_AH:        /* SPI */
  36                return 4;
  37        default:
  38                return -EINVAL;
  39        }
  40}
  41
  42static inline bool ipv4_is_loopback(__be32 addr)
  43{
  44        return (addr & htonl(0xff000000)) == htonl(0x7f000000);
  45}
  46
  47static inline bool ipv4_is_multicast(__be32 addr)
  48{
  49        return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
  50}
  51
  52static inline bool ipv4_is_local_multicast(__be32 addr)
  53{
  54        return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
  55}
  56
  57static inline bool ipv4_is_lbcast(__be32 addr)
  58{
  59        /* limited broadcast */
  60        return addr == htonl(INADDR_BROADCAST);
  61}
  62
  63static inline bool ipv4_is_zeronet(__be32 addr)
  64{
  65        return (addr & htonl(0xff000000)) == htonl(0x00000000);
  66}
  67
  68/* Special-Use IPv4 Addresses (RFC3330) */
  69
  70static inline bool ipv4_is_private_10(__be32 addr)
  71{
  72        return (addr & htonl(0xff000000)) == htonl(0x0a000000);
  73}
  74
  75static inline bool ipv4_is_private_172(__be32 addr)
  76{
  77        return (addr & htonl(0xfff00000)) == htonl(0xac100000);
  78}
  79
  80static inline bool ipv4_is_private_192(__be32 addr)
  81{
  82        return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
  83}
  84
  85static inline bool ipv4_is_linklocal_169(__be32 addr)
  86{
  87        return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
  88}
  89
  90static inline bool ipv4_is_anycast_6to4(__be32 addr)
  91{
  92        return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
  93}
  94
  95static inline bool ipv4_is_test_192(__be32 addr)
  96{
  97        return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
  98}
  99
 100static inline bool ipv4_is_test_198(__be32 addr)
 101{
 102        return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
 103}
 104#endif  /* _LINUX_IN_H */
 105
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