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 _LINUX_IP_H 19 #define _LINUX_IP_H 20 #include <linux/types.h> 21 #include <asm/byteorder.h> 22 23 #define IPTOS_TOS_MASK 0x1E 24 #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK) 25 #define IPTOS_LOWDELAY 0x10 26 #define IPTOS_THROUGHPUT 0x08 27 #define IPTOS_RELIABILITY 0x04 28 #define IPTOS_MINCOST 0x02 29 30 #define IPTOS_PREC_MASK 0xE0 31 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK) 32 #define IPTOS_PREC_NETCONTROL 0xe0 33 #define IPTOS_PREC_INTERNETCONTROL 0xc0 34 #define IPTOS_PREC_CRITIC_ECP 0xa0 35 #define IPTOS_PREC_FLASHOVERRIDE 0x80 36 #define IPTOS_PREC_FLASH 0x60 37 #define IPTOS_PREC_IMMEDIATE 0x40 38 #define IPTOS_PREC_PRIORITY 0x20 39 #define IPTOS_PREC_ROUTINE 0x00 40 41 42 /* IP options */ 43 #define IPOPT_COPY 0x80 44 #define IPOPT_CLASS_MASK 0x60 45 #define IPOPT_NUMBER_MASK 0x1f 46 47 #define IPOPT_COPIED(o) ((o)&IPOPT_COPY) 48 #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK) 49 #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK) 50 51 #define IPOPT_CONTROL 0x00 52 #define IPOPT_RESERVED1 0x20 53 #define IPOPT_MEASUREMENT 0x40 54 #define IPOPT_RESERVED2 0x60 55 56 #define IPOPT_END (0 |IPOPT_CONTROL) 57 #define IPOPT_NOOP (1 |IPOPT_CONTROL) 58 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) 59 #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) 60 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) 61 #define IPOPT_CIPSO (6 |IPOPT_CONTROL|IPOPT_COPY) 62 #define IPOPT_RR (7 |IPOPT_CONTROL) 63 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) 64 #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) 65 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) 66 67 #define IPVERSION 4 68 #define MAXTTL 255 69 #define IPDEFTTL 64 70 71 #define IPOPT_OPTVAL 0 72 #define IPOPT_OLEN 1 73 #define IPOPT_OFFSET 2 74 #define IPOPT_MINOFF 4 75 #define MAX_IPOPTLEN 40 76 #define IPOPT_NOP IPOPT_NOOP 77 #define IPOPT_EOL IPOPT_END 78 #define IPOPT_TS IPOPT_TIMESTAMP 79 80 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 81 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 82 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 83 84 #define IPV4_BEET_PHMAXLEN 8 85 86 struct iphdr { 87 #if defined(__LITTLE_ENDIAN_BITFIELD) 88 __u8 ihl:4, 89 version:4; 90 #elif defined (__BIG_ENDIAN_BITFIELD) 91 __u8 version:4, 92 ihl:4; 93 #else 94 #error "Please fix <asm/byteorder.h>" 95 #endif 96 __u8 tos; 97 __be16 tot_len; 98 __be16 id; 99 __be16 frag_off; 100 __u8 ttl; 101 __u8 protocol; 102 __sum16 check; 103 __be32 saddr; 104 __be32 daddr; 105 /*The options start here. */ 106 }; 107 108 109 struct ip_auth_hdr { 110 __u8 nexthdr; 111 __u8 hdrlen; /* This one is measured in 32 bit units! */ 112 __be16 reserved; 113 __be32 spi; 114 __be32 seq_no; /* Sequence number */ 115 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */ 116 }; 117 118 struct ip_esp_hdr { 119 __be32 spi; 120 __be32 seq_no; /* Sequence number */ 121 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */ 122 }; 123 124 struct ip_comp_hdr { 125 __u8 nexthdr; 126 __u8 flags; 127 __be16 cpi; 128 }; 129 130 struct ip_beet_phdr { 131 __u8 nexthdr; 132 __u8 hdrlen; 133 __u8 padlen; 134 __u8 reserved; 135 }; 136 137 /* index values for the variables in ipv4_devconf */ 138 enum 139 { 140 IPV4_DEVCONF_FORWARDING=1, 141 IPV4_DEVCONF_MC_FORWARDING, 142 IPV4_DEVCONF_PROXY_ARP, 143 IPV4_DEVCONF_ACCEPT_REDIRECTS, 144 IPV4_DEVCONF_SECURE_REDIRECTS, 145 IPV4_DEVCONF_SEND_REDIRECTS, 146 IPV4_DEVCONF_SHARED_MEDIA, 147 IPV4_DEVCONF_RP_FILTER, 148 IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE, 149 IPV4_DEVCONF_BOOTP_RELAY, 150 IPV4_DEVCONF_LOG_MARTIANS, 151 IPV4_DEVCONF_TAG, 152 IPV4_DEVCONF_ARPFILTER, 153 IPV4_DEVCONF_MEDIUM_ID, 154 IPV4_DEVCONF_NOXFRM, 155 IPV4_DEVCONF_NOPOLICY, 156 IPV4_DEVCONF_FORCE_IGMP_VERSION, 157 IPV4_DEVCONF_ARP_ANNOUNCE, 158 IPV4_DEVCONF_ARP_IGNORE, 159 IPV4_DEVCONF_PROMOTE_SECONDARIES, 160 IPV4_DEVCONF_ARP_ACCEPT, 161 IPV4_DEVCONF_ARP_NOTIFY, 162 IPV4_DEVCONF_ACCEPT_LOCAL, 163 IPV4_DEVCONF_SRC_VMARK, 164 IPV4_DEVCONF_PROXY_ARP_PVLAN, 165 IPV4_DEVCONF_ROUTE_LOCALNET, 166 IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL, 167 IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL, 168 IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN, 169 IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST, 170 IPV4_DEVCONF_DROP_GRATUITOUS_ARP, 171 IPV4_DEVCONF_BC_FORWARDING, 172 __IPV4_DEVCONF_MAX 173 }; 174 175 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1) 176 177 #endif /* _LINUX_IP_H */ 178
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