ip.h (4845B) - Raw
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 <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 87 struct 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 }; 110 111 112 struct 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 }; 120 121 struct 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 }; 126 127 struct ip_comp_hdr { 128 __u8 nexthdr; 129 __u8 flags; 130 __be16 cpi; 131 }; 132 133 struct 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 */ 141 enum 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 /* _LINUX_IP_H */