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 #include <linux/types.h>
 22
 23 /* Standard well-defined IP protocols. */
 24 enum{
 25  IPPROTO_IP =0,/* Dummy protocol for TCP */
 26  IPPROTO_ICMP =1,/* Internet Control Message Protocol */
 27  IPPROTO_IGMP =2,/* Internet Group Management Protocol */
 28  IPPROTO_IPIP =4,/* IPIP tunnels (older KA9Q tunnels use 94) */
 29  IPPROTO_TCP =6,/* Transmission Control Protocol */
 30  IPPROTO_EGP =8,/* Exterior Gateway Protocol */
 31  IPPROTO_PUP =12,/* PUP protocol */
 32  IPPROTO_UDP =17,/* User Datagram Protocol */
 33  IPPROTO_IDP =22,/* XNS IDP protocol */
 34  IPPROTO_RSVP =46,/* RSVP protocol */
 35  IPPROTO_GRE =47,/* Cisco GRE tunnels (rfc 1701,1702) */
 36
 37  IPPROTO_IPV6 =41,/* IPv6-in-IPv4 tunnelling */
 38
 39  IPPROTO_PIM =103,/* Protocol Independent Multicast */
 40
 41  IPPROTO_ESP =50,/* Encapsulation Security Payload protocol */
 42  IPPROTO_AH =51,/* Authentication Header protocol */
 43  IPPROTO_COMP =108,/* Compression Header protocol */
 44
 45  IPPROTO_RAW =255,/* Raw IP packets */
 46  IPPROTO_MAX
 47 };
 48
 49
 50 /* Internet address. */
 51 struct in_addr {
 52  __u32 s_addr;
 53 };
 54
 55 #define IP_TOS 1
 56 #define IP_TTL 2
 57 #define IP_HDRINCL 3
 58 #define IP_OPTIONS 4
 59 #define IP_ROUTER_ALERT 5
 60 #define IP_RECVOPTS 6
 61 #define IP_RETOPTS 7
 62 #define IP_PKTINFO 8
 63 #define IP_PKTOPTIONS 9
 64 #define IP_MTU_DISCOVER 10
 65 #define IP_RECVERR 11
 66 #define IP_RECVTTL 12
 67 #define IP_RECVTOS 13
 68 #define IP_MTU 14
 69 #define IP_FREEBIND 15
 70
 71 /* BSD compatibility */
 72 #define IP_RECVRETOPTS IP_RETOPTS
 73
 74 /* IP_MTU_DISCOVER values */
 75 #define IP_PMTUDISC_DONT 0/* Never send DF frames */
 76 #define IP_PMTUDISC_WANT 1/* Use per route hints */
 77 #define IP_PMTUDISC_DO 2/* Always DF */
 78
 79 #define IP_MULTICAST_IF 32
 80 #define IP_MULTICAST_TTL 33
 81 #define IP_MULTICAST_LOOP 34
 82 #define IP_ADD_MEMBERSHIP 35
 83 #define IP_DROP_MEMBERSHIP 36
 84
 85 /* These need to appear somewhere around here */
 86 #define IP_DEFAULT_MULTICAST_TTL 1
 87 #define IP_DEFAULT_MULTICAST_LOOP 1
 88
 89 /* Request struct for multicast socket ops */
 90
 91 struct ip_mreq
 92 {
 93 struct in_addr imr_multiaddr;/* IP multicast address of group */
 94 struct in_addr imr_interface;/* local IP address of interface */
 95 };
 96
 97 struct ip_mreqn
 98 {
 99 struct in_addr imr_multiaddr;/* IP multicast address of group */
 100 struct in_addr imr_address;/* local IP address of interface */
 101 int imr_ifindex;/* Interface index */
 102 };
 103
 104 struct in_pktinfo
 105 {
 106 int ipi_ifindex;
 107 struct in_addr ipi_spec_dst;
 108 struct in_addr ipi_addr;
 109 };
 110
 111 /* Structure describing an Internet (IP) socket address. */
 112 #define __SOCK_SIZE__ 16/* sizeof(struct sockaddr) */
 113 struct sockaddr_in {
 114  sa_family_t sin_family;/* Address family */
 115 unsigned short int sin_port;/* Port number */
 116 struct in_addr sin_addr;/* Internet address */
 117
 118 /* Pad to size of `struct sockaddr'. */
 119 unsigned char __pad[__SOCK_SIZE__ -sizeof(short int) -
 120 sizeof(unsigned short int) -sizeof(struct in_addr)];
 121 };
 122 #define sin_zero __pad/* for BSD UNIX comp. -FvK */
 123
 124
 125 /*
 126  * Definitions of the bits in an Internet address integer.
 127  * On subnets, host and network parts are found according
 128  * to the subnet mask, not these masks.
 129  */
 130 #define IN_CLASSA(a) ((((long int) (a)) & 0x80000000) == 0)
 131 #define IN_CLASSA_NET 0xff000000
 132 #define IN_CLASSA_NSHIFT 24
 133 #define IN_CLASSA_HOST (0xffffffff & ~IN_CLASSA_NET)
 134 #define IN_CLASSA_MAX 128
 135
 136 #define IN_CLASSB(a) ((((long int) (a)) & 0xc0000000) == 0x80000000)
 137 #define IN_CLASSB_NET 0xffff0000
 138 #define IN_CLASSB_NSHIFT 16
 139 #define IN_CLASSB_HOST (0xffffffff & ~IN_CLASSB_NET)
 140 #define IN_CLASSB_MAX 65536
 141
 142 #define IN_CLASSC(a) ((((long int) (a)) & 0xe0000000) == 0xc0000000)
 143 #define IN_CLASSC_NET 0xffffff00
 144 #define IN_CLASSC_NSHIFT 8
 145 #define IN_CLASSC_HOST (0xffffffff & ~IN_CLASSC_NET)
 146
 147 #define IN_CLASSD(a) ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 148 #define IN_MULTICAST(a) IN_CLASSD(a)
 149 #define IN_MULTICAST_NET 0xF0000000
 150
 151 #define IN_EXPERIMENTAL(a) ((((long int) (a)) & 0xf0000000) == 0xf0000000)
 152 #define IN_BADCLASS(a) IN_EXPERIMENTAL((a))
 153
 154 /* Address to accept any incoming messages. */
 155 #define INADDR_ANY ((unsigned long int) 0x00000000)
 156
 157 /* Address to send to all hosts. */
 158 #define INADDR_BROADCAST ((unsigned long int) 0xffffffff)
 159
 160 /* Address indicating an error return. */
 161 #define INADDR_NONE ((unsigned long int) 0xffffffff)
 162
 163 /* Network number for local host loopback. */
 164 #define IN_LOOPBACKNET 127
 165
 166 /* Address to loopback in software to local host. */
 167 #define INADDR_LOOPBACK 0x7f000001/* 127.0.0.1 */
 168 #define IN_LOOPBACK(a) ((((long int) (a)) & 0xff000000) == 0x7f000000)
 169
 170 /* Defines for Multicast INADDR */
 171 #define INADDR_UNSPEC_GROUP 0xe0000000U/* 224.0.0.0 */
 172 #define INADDR_ALLHOSTS_GROUP 0xe0000001U/* 224.0.0.1 */
 173 #define INADDR_ALLRTRS_GROUP 0xe0000002U/* 224.0.0.2 */
 174 #define INADDR_MAX_LOCAL_GROUP 0xe00000ffU/* 224.0.0.255 */
 175
 176
 177 /* <asm/byteorder.h> contains the htonl type stuff.. */
 178 #include <asm/byteorder.h>
 179
 180 #ifdef __KERNEL__
 181 /* Some random defines to make it easier in the kernel.. */
 182 #define LOOPBACK(x) (((x) & htonl(0xff000000)) == htonl(0x7f000000))
 183 #define MULTICAST(x) (((x) & htonl(0xf0000000)) == htonl(0xe0000000))
 184 #define BADCLASS(x) (((x) & htonl(0xf0000000)) == htonl(0xf0000000))
 185 #define ZERONET(x) (((x) & htonl(0xff000000)) == htonl(0x00000000))
 186 #define LOCAL_MCAST(x) (((x) & htonl(0xFFFFFF00)) == htonl(0xE0000000))
 187
 188 #endif
 189
 190 #endif/* _LINUX_IN_H */