1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ 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 for the IP protocol. 8 * 9 * Version: @(#)ip.h 1.0.2 04/28/93 10 * 11 * Authors: 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 _UAPI_LINUX_IP_H 19#define _UAPI_LINUX_IP_H 20#include <linux/types.h> 21#include <linux/stddef.h> 22#include <asm/byteorder.h> 23 24#define IPTOS_TOS_MASK 0x1E 25#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) 26#define IPTOS_LOWDELAY 0x10 27#define IPTOS_THROUGHPUT 0x08 28#define IPTOS_RELIABILITY 0x04 29#define IPTOS_MINCOST 0x02 30 31#define IPTOS_PREC_MASK 0xE0 32#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) 33#define IPTOS_PREC_NETCONTROL 0xe0 34#define IPTOS_PREC_INTERNETCONTROL 0xc0 35#define IPTOS_PREC_CRITIC_ECP 0xa0 36#define IPTOS_PREC_FLASHOVERRIDE 0x80 37#define IPTOS_PREC_FLASH 0x60 38#define IPTOS_PREC_IMMEDIATE 0x40 39#define IPTOS_PREC_PRIORITY 0x20 40#define IPTOS_PREC_ROUTINE 0x00 41 42 43/* IP options */ 44#define IPOPT_COPY 0x80 45#define IPOPT_CLASS_MASK 0x60 46#define IPOPT_NUMBER_MASK 0x1f 47 48#define IPOPT_COPIED(o) ((o)&IPOPT_COPY) 49#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) 50#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) 51 52#define IPOPT_CONTROL 0x00 53#define IPOPT_RESERVED1 0x20 54#define IPOPT_MEASUREMENT 0x40 55#define IPOPT_RESERVED2 0x60 56 57#define IPOPT_END (0 |IPOPT_CONTROL) 58#define IPOPT_NOOP (1 |IPOPT_CONTROL) 59#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 60#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) 61#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 62#define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY) 63#define IPOPT_RR (7 |IPOPT_CONTROL) 64#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 65#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) 66#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 67 68#define IPVERSION 4 69#define MAXTTL 255 70#define IPDEFTTL 64 71 72#define IPOPT_OPTVAL 0 73#define IPOPT_OLEN 1 74#define IPOPT_OFFSET 2 75#define IPOPT_MINOFF 4 76#define MAX_IPOPTLEN 40 77#define IPOPT_NOP IPOPT_NOOP 78#define IPOPT_EOL IPOPT_END 79#define IPOPT_TS IPOPT_TIMESTAMP 80 81#define IPOPT_TS_TSONLY 0 /* timestamps only */ 82#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 83#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 84 85#define IPV4_BEET_PHMAXLEN 8 86 87struct iphdr { 88#if defined(__LITTLE_ENDIAN_BITFIELD) 89 __u8 ihl:4, 90 version:4; 91#elif defined (__BIG_ENDIAN_BITFIELD) 92 __u8 version:4, 93 ihl:4; 94#else 95#error "Please fix <asm/byteorder.h>" 96#endif 97 __u8 tos; 98 __be16 tot_len; 99 __be16 id; 100 __be16 frag_off; 101 __u8 ttl; 102 __u8 protocol; 103 __sum16 check; 104 __struct_group(/* no tag */, addrs, /* no attrs */, 105 __be32 saddr; 106 __be32 daddr; 107 ); 108 /*The options start here. */ 109}; 110 111 112struct ip_auth_hdr { 113 __u8 nexthdr; 114 __u8 hdrlen; /* This one is measured in 32 bit units! */ 115 __be16 reserved; 116 __be32 spi; 117 __be32 seq_no; /* Sequence number */ 118 __u8 auth_data[]; /* Variable len but >=4. Mind the 64 bit alignment! */ 119}; 120 121struct ip_esp_hdr { 122 __be32 spi; 123 __be32 seq_no; /* Sequence number */ 124 __u8 enc_data[]; /* Variable len but >=8. Mind the 64 bit alignment! */ 125}; 126 127struct ip_comp_hdr { 128 __u8 nexthdr; 129 __u8 flags; 130 __be16 cpi; 131}; 132 133struct ip_beet_phdr { 134 __u8 nexthdr; 135 __u8 hdrlen; 136 __u8 padlen; 137 __u8 reserved; 138}; 139 140/* index values for the variables in ipv4_devconf */ 141enum 142{ 143 IPV4_DEVCONF_FORWARDING=1, 144 IPV4_DEVCONF_MC_FORWARDING, 145 IPV4_DEVCONF_PROXY_ARP, 146 IPV4_DEVCONF_ACCEPT_REDIRECTS, 147 IPV4_DEVCONF_SECURE_REDIRECTS, 148 IPV4_DEVCONF_SEND_REDIRECTS, 149 IPV4_DEVCONF_SHARED_MEDIA, 150 IPV4_DEVCONF_RP_FILTER, 151 IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE, 152 IPV4_DEVCONF_BOOTP_RELAY, 153 IPV4_DEVCONF_LOG_MARTIANS, 154 IPV4_DEVCONF_TAG, 155 IPV4_DEVCONF_ARPFILTER, 156 IPV4_DEVCONF_MEDIUM_ID, 157 IPV4_DEVCONF_NOXFRM, 158 IPV4_DEVCONF_NOPOLICY, 159 IPV4_DEVCONF_FORCE_IGMP_VERSION, 160 IPV4_DEVCONF_ARP_ANNOUNCE, 161 IPV4_DEVCONF_ARP_IGNORE, 162 IPV4_DEVCONF_PROMOTE_SECONDARIES, 163 IPV4_DEVCONF_ARP_ACCEPT, 164 IPV4_DEVCONF_ARP_NOTIFY, 165 IPV4_DEVCONF_ACCEPT_LOCAL, 166 IPV4_DEVCONF_SRC_VMARK, 167 IPV4_DEVCONF_PROXY_ARP_PVLAN, 168 IPV4_DEVCONF_ROUTE_LOCALNET, 169 IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL, 170 IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL, 171 IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN, 172 IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST, 173 IPV4_DEVCONF_DROP_GRATUITOUS_ARP, 174 IPV4_DEVCONF_BC_FORWARDING, 175 IPV4_DEVCONF_ARP_EVICT_NOCARRIER, 176 __IPV4_DEVCONF_MAX 177}; 178 179#define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1) 180 181#endif /* _UAPI_LINUX_IP_H */ 182