include/linux/in.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * INET     An implementation of the TCP/IP protocol suite for the LINUX
0004  *      operating system.  INET is implemented using the  BSD Socket
0005  *      interface as the means of communication with the user level.
0006  *
0007  *      Definitions of the Internet Protocol.
0008  *
0009  * Version: @(#)in.h    1.0.1   04/21/93
0010  *
0011  * Authors: Original taken from the GNU Project <netinet/in.h> file.
0012  *      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
0013  */
0014 #ifndef _LINUX_IN_H
0015 #define _LINUX_IN_H
0016
0017
0018 #include <linux/errno.h>
0019 #include <uapi/linux/in.h>
0020
0021 static inline int proto_ports_offset(int proto)
0022 {
0023     switch (proto) {
0024     case IPPROTO_TCP:
0025     case IPPROTO_UDP:
0026     case IPPROTO_DCCP:
0027     case IPPROTO_ESP:   /* SPI */
0028     case IPPROTO_SCTP:
0029     case IPPROTO_UDPLITE:
0030         return 0;
0031     case IPPROTO_AH:    /* SPI */
0032         return 4;
0033     default:
0034         return -EINVAL;
0035     }
0036 }
0037
0038 static inline bool ipv4_is_loopback(__be32 addr)
0039 {
0040     return (addr & htonl(0xff000000)) == htonl(0x7f000000);
0041 }
0042
0043 static inline bool ipv4_is_multicast(__be32 addr)
0044 {
0045     return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
0046 }
0047
0048 static inline bool ipv4_is_local_multicast(__be32 addr)
0049 {
0050     return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
0051 }
0052
0053 static inline bool ipv4_is_lbcast(__be32 addr)
0054 {
0055     /* limited broadcast */
0056     return addr == htonl(INADDR_BROADCAST);
0057 }
0058
0059 static inline bool ipv4_is_all_snoopers(__be32 addr)
0060 {
0061     return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
0062 }
0063
0064 static inline bool ipv4_is_zeronet(__be32 addr)
0065 {
0066     return (addr == 0);
0067 }
0068
0069 /* Special-Use IPv4 Addresses (RFC3330) */
0070
0071 static inline bool ipv4_is_private_10(__be32 addr)
0072 {
0073     return (addr & htonl(0xff000000)) == htonl(0x0a000000);
0074 }
0075
0076 static inline bool ipv4_is_private_172(__be32 addr)
0077 {
0078     return (addr & htonl(0xfff00000)) == htonl(0xac100000);
0079 }
0080
0081 static inline bool ipv4_is_private_192(__be32 addr)
0082 {
0083     return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
0084 }
0085
0086 static inline bool ipv4_is_linklocal_169(__be32 addr)
0087 {
0088     return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
0089 }
0090
0091 static inline bool ipv4_is_anycast_6to4(__be32 addr)
0092 {
0093     return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
0094 }
0095
0096 static inline bool ipv4_is_test_192(__be32 addr)
0097 {
0098     return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
0099 }
0100
0101 static inline bool ipv4_is_test_198(__be32 addr)
0102 {
0103     return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
0104 }
0105 #endif  /* _LINUX_IN_H */