1/* $OpenBSD: ip.h,v 1.20 2021/12/14 23:47:36 dtucker Exp $ */ 2/* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */ 3 4/* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ip.h 8.1 (Berkeley) 6/10/93 33 */ 34 35#ifndef _NETINET_IP_H_ 36#define _NETINET_IP_H_ 37 38/* 39 * Definitions for internet protocol version 4. 40 * Per RFC 791, September 1981. 41 */ 42#define IPVERSION 4 43 44/* 45 * Structure of an internet header, naked of options. 46 */ 47struct ip { 48#if _BYTE_ORDER == _LITTLE_ENDIAN 49 u_int ip_hl:4, /* header length */ 50 ip_v:4; /* version */ 51#endif 52#if _BYTE_ORDER == _BIG_ENDIAN 53 u_int ip_v:4, /* version */ 54 ip_hl:4; /* header length */ 55#endif 56 u_int8_t ip_tos; /* type of service */ 57 u_int16_t ip_len; /* total length */ 58 u_int16_t ip_id; /* identification */ 59 u_int16_t ip_off; /* fragment offset field */ 60#define IP_RF 0x8000 /* reserved fragment flag */ 61#define IP_DF 0x4000 /* dont fragment flag */ 62#define IP_MF 0x2000 /* more fragments flag */ 63#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 64 u_int8_t ip_ttl; /* time to live */ 65 u_int8_t ip_p; /* protocol */ 66 u_int16_t ip_sum; /* checksum */ 67 struct in_addr ip_src, ip_dst; /* source and dest address */ 68}; 69 70#define IP_MAXPACKET 65535 /* maximum packet size */ 71 72/* 73 * Definitions for IP type of service (ip_tos) 74 */ 75#define IPTOS_LOWDELAY 0x10 76#define IPTOS_THROUGHPUT 0x08 77#define IPTOS_RELIABILITY 0x04 78/* IPTOS_LOWCOST 0x02 XXX */ 79#if 1 80/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 81#define IPTOS_CE 0x01 /* congestion experienced */ 82#define IPTOS_ECT 0x02 /* ECN-capable transport */ 83#endif 84 85/* 86 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 87 */ 88#define IPTOS_PREC_NETCONTROL 0xe0 89#define IPTOS_PREC_INTERNETCONTROL 0xc0 90#define IPTOS_PREC_CRITIC_ECP 0xa0 91#define IPTOS_PREC_FLASHOVERRIDE 0x80 92#define IPTOS_PREC_FLASH 0x60 93#define IPTOS_PREC_IMMEDIATE 0x40 94#define IPTOS_PREC_PRIORITY 0x20 95#define IPTOS_PREC_ROUTINE 0x00 96 97/* 98 * Definitions for DiffServ Codepoints as per RFCs 2474, 3246, 4594 & 8622. 99 * These are the 6 most significant bits as they appear on the wire, so the 100 * two least significant bits must be zero. 101 */ 102#define IPTOS_DSCP_CS0 0x00 103#define IPTOS_DSCP_LE 0x04 104#define IPTOS_DSCP_CS1 0x20 105#define IPTOS_DSCP_AF11 0x28 106#define IPTOS_DSCP_AF12 0x30 107#define IPTOS_DSCP_AF13 0x38 108#define IPTOS_DSCP_CS2 0x40 109#define IPTOS_DSCP_AF21 0x48 110#define IPTOS_DSCP_AF22 0x50 111#define IPTOS_DSCP_AF23 0x58 112#define IPTOS_DSCP_CS3 0x60 113#define IPTOS_DSCP_AF31 0x68 114#define IPTOS_DSCP_AF32 0x70 115#define IPTOS_DSCP_AF33 0x78 116#define IPTOS_DSCP_CS4 0x80 117#define IPTOS_DSCP_AF41 0x88 118#define IPTOS_DSCP_AF42 0x90 119#define IPTOS_DSCP_AF43 0x98 120#define IPTOS_DSCP_CS5 0xa0 121#define IPTOS_DSCP_EF 0xb8 122#define IPTOS_DSCP_CS6 0xc0 123#define IPTOS_DSCP_CS7 0xe0 124 125/* 126 * ECN (Explicit Congestion Notification) codepoints in RFC3168 127 * mapped to the lower 2 bits of the TOS field. 128 */ 129#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 130#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 131#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 132#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 133#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 134 135/* 136 * Definitions for options. 137 */ 138#define IPOPT_COPIED(o) ((o)&0x80) 139#define IPOPT_CLASS(o) ((o)&0x60) 140#define IPOPT_NUMBER(o) ((o)&0x1f) 141 142#define IPOPT_CONTROL 0x00 143#define IPOPT_RESERVED1 0x20 144#define IPOPT_DEBMEAS 0x40 145#define IPOPT_RESERVED2 0x60 146 147#define IPOPT_EOL 0 /* end of option list */ 148#define IPOPT_NOP 1 /* no operation */ 149 150#define IPOPT_RR 7 /* record packet route */ 151#define IPOPT_TS 68 /* timestamp */ 152#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 153#define IPOPT_LSRR 131 /* loose source route */ 154#define IPOPT_SATID 136 /* satnet id */ 155#define IPOPT_SSRR 137 /* strict source route */ 156#define IPOPT_RA 148 /* router alert */ 157 158/* 159 * Offsets to fields in options other than EOL and NOP. 160 */ 161#define IPOPT_OPTVAL 0 /* option ID */ 162#define IPOPT_OLEN 1 /* option length */ 163#define IPOPT_OFFSET 2 /* offset within option */ 164#define IPOPT_MINOFF 4 /* min value of above */ 165 166/* 167 * Time stamp option structure. 168 */ 169struct ip_timestamp { 170 u_int8_t ipt_code; /* IPOPT_TS */ 171 u_int8_t ipt_len; /* size of structure (variable) */ 172 u_int8_t ipt_ptr; /* index of current entry */ 173#if _BYTE_ORDER == _LITTLE_ENDIAN 174 u_int ipt_flg:4, /* flags, see below */ 175 ipt_oflw:4; /* overflow counter */ 176#endif 177#if _BYTE_ORDER == _BIG_ENDIAN 178 u_int ipt_oflw:4, /* overflow counter */ 179 ipt_flg:4; /* flags, see below */ 180#endif 181 union ipt_timestamp { 182 u_int32_t ipt_time[1]; 183 struct ipt_ta { 184 struct in_addr ipt_addr; 185 u_int32_t ipt_time; 186 } ipt_ta[1]; 187 } ipt_timestamp; 188}; 189 190/* flag bits for ipt_flg */ 191#define IPOPT_TS_TSONLY 0 /* timestamps only */ 192#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 193#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 194 195/* bits for security (not byte swapped) */ 196#define IPOPT_SECUR_UNCLASS 0x0000 197#define IPOPT_SECUR_CONFID 0xf135 198#define IPOPT_SECUR_EFTO 0x789a 199#define IPOPT_SECUR_MMMM 0xbc4d 200#define IPOPT_SECUR_RESTR 0xaf13 201#define IPOPT_SECUR_SECRET 0xd788 202#define IPOPT_SECUR_TOPSECRET 0x6bc5 203 204/* 205 * Internet implementation parameters. 206 */ 207#define MAXTTL 255 /* maximum time to live (seconds) */ 208#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 209#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 210#define IPTTLDEC 1 /* subtracted when forwarding */ 211 212#define IP_MSS 576 /* default maximum segment size */ 213 214#ifdef _KERNEL 215 216/* Maximum length for IP protocol queues */ 217#define IPQ_MAXLEN 2048 218 219/* 220 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 221 * checksums. For the Internet checksum, struct ipovly can be used instead. 222 * For stronger checksums, the real thing must be used. 223 */ 224struct ippseudo { 225 struct in_addr ippseudo_src; /* source internet address */ 226 struct in_addr ippseudo_dst; /* destination internet address */ 227 u_int8_t ippseudo_pad; /* pad, must be zero */ 228 u_int8_t ippseudo_p; /* protocol */ 229 u_int16_t ippseudo_len; /* protocol length */ 230}; 231#endif /* _KERNEL */ 232 233#endif /* _NETINET_IP_H_ */ 234