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 == 0);
 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 */