LXR linux/include/linux/in.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   4 *              operating system.  INET is implemented using the  BSD Socket
   5 *              interface as the means of communication with the user level.
   6 *
   7 *              Definitions of the Internet Protocol.
   8 *
   9 * Version:     @(#)in.h        1.0.1   04/21/93
  10 *
  11 * Authors:     Original taken from the GNU Project <netinet/in.h> file.
  12 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  13 */
  14#ifndef _LINUX_IN_H
  15#define _LINUX_IN_H
  16
  17
  18#include <linux/errno.h>
  19#include <uapi/linux/in.h>
  20
  21static inline int proto_ports_offset(int proto)
  22{
  23        switch (proto) {
  24        case IPPROTO_TCP:
  25        case IPPROTO_UDP:
  26        case IPPROTO_DCCP:
  27        case IPPROTO_ESP:       /* SPI */
  28        case IPPROTO_SCTP:
  29        case IPPROTO_UDPLITE:
  30                return 0;
  31        case IPPROTO_AH:        /* SPI */
  32                return 4;
  33        default:
  34                return -EINVAL;
  35        }
  36}
  37
  38static inline bool ipv4_is_loopback(__be32 addr)
  39{
  40        return (addr & htonl(0xff000000)) == htonl(0x7f000000);
  41}
  42
  43static inline bool ipv4_is_multicast(__be32 addr)
  44{
  45        return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
  46}
  47
  48static inline bool ipv4_is_local_multicast(__be32 addr)
  49{
  50        return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
  51}
  52
  53static inline bool ipv4_is_lbcast(__be32 addr)
  54{
  55        /* limited broadcast */
  56        return addr == htonl(INADDR_BROADCAST);
  57}
  58
  59static inline bool ipv4_is_all_snoopers(__be32 addr)
  60{
  61        return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
  62}
  63
  64static inline bool ipv4_is_zeronet(__be32 addr)
  65{
  66        return (addr & htonl(0xff000000)) == htonl(0x00000000);
  67}
  68
  69/* Special-Use IPv4 Addresses (RFC3330) */
  70
  71static inline bool ipv4_is_private_10(__be32 addr)
  72{
  73        return (addr & htonl(0xff000000)) == htonl(0x0a000000);
  74}
  75
  76static inline bool ipv4_is_private_172(__be32 addr)
  77{
  78        return (addr & htonl(0xfff00000)) == htonl(0xac100000);
  79}
  80
  81static inline bool ipv4_is_private_192(__be32 addr)
  82{
  83        return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
  84}
  85
  86static inline bool ipv4_is_linklocal_169(__be32 addr)
  87{
  88        return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
  89}
  90
  91static inline bool ipv4_is_anycast_6to4(__be32 addr)
  92{
  93        return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
  94}
  95
  96static inline bool ipv4_is_test_192(__be32 addr)
  97{
  98        return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
  99}
 100
 101static inline bool ipv4_is_test_198(__be32 addr)
 102{
 103        return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
 104}
 105#endif  /* _LINUX_IN_H */
 106