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
  21 static 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
  38 static inline bool ipv4_is_loopback(__be32 addr)
  39 {
  40         return (addr & htonl(0xff000000)) == htonl(0x7f000000);
  41 }
  42
  43 static inline bool ipv4_is_multicast(__be32 addr)
  44 {
  45         return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
  46 }
  47
  48 static inline bool ipv4_is_local_multicast(__be32 addr)
  49 {
  50         return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
  51 }
  52
  53 static inline bool ipv4_is_lbcast(__be32 addr)
  54 {
  55         /* limited broadcast */
  56         return addr == htonl(INADDR_BROADCAST);
  57 }
  58
  59 static inline bool ipv4_is_all_snoopers(__be32 addr)
  60 {
  61         return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
  62 }
  63
  64 static inline bool ipv4_is_zeronet(__be32 addr)
  65 {
  66         return (addr & htonl(0xff000000)) == htonl(0x00000000);
  67 }
  68
  69 /* Special-Use IPv4 Addresses (RFC3330) */
  70
  71 static inline bool ipv4_is_private_10(__be32 addr)
  72 {
  73         return (addr & htonl(0xff000000)) == htonl(0x0a000000);
  74 }
  75
  76 static inline bool ipv4_is_private_172(__be32 addr)
  77 {
  78         return (addr & htonl(0xfff00000)) == htonl(0xac100000);
  79 }
  80
  81 static inline bool ipv4_is_private_192(__be32 addr)
  82 {
  83         return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
  84 }
  85
  86 static inline bool ipv4_is_linklocal_169(__be32 addr)
  87 {
  88         return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
  89 }
  90
  91 static inline bool ipv4_is_anycast_6to4(__be32 addr)
  92 {
  93         return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
  94 }
  95
  96 static inline bool ipv4_is_test_192(__be32 addr)
  97 {
  98         return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
  99 }
 100
 101 static inline bool ipv4_is_test_198(__be32 addr)
 102 {
 103         return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
 104 }
 105 #endif  /* _LINUX_IN_H */