ip.h revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. 6 * 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 * 4. 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 8.2 (Berkeley) 6/1/94 33 * $FreeBSD: stable/11/sys/netinet/ip.h 330897 2018-03-14 03:19:51Z eadler $ 34 */ 35 36#ifndef _NETINET_IP_H_ 37#define _NETINET_IP_H_ 38 39#include <sys/cdefs.h> 40 41/* 42 * Definitions for internet protocol version 4. 43 * 44 * Per RFC 791, September 1981. 45 */ 46#define IPVERSION 4 47 48/* 49 * Structure of an internet header, naked of options. 50 */ 51struct ip { 52#if BYTE_ORDER == LITTLE_ENDIAN 53 u_char ip_hl:4, /* header length */ 54 ip_v:4; /* version */ 55#endif 56#if BYTE_ORDER == BIG_ENDIAN 57 u_char ip_v:4, /* version */ 58 ip_hl:4; /* header length */ 59#endif 60 u_char ip_tos; /* type of service */ 61 u_short ip_len; /* total length */ 62 u_short ip_id; /* identification */ 63 u_short ip_off; /* fragment offset field */ 64#define IP_RF 0x8000 /* reserved fragment flag */ 65#define IP_DF 0x4000 /* dont fragment flag */ 66#define IP_MF 0x2000 /* more fragments flag */ 67#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 68 u_char ip_ttl; /* time to live */ 69 u_char ip_p; /* protocol */ 70 u_short ip_sum; /* checksum */ 71 struct in_addr ip_src,ip_dst; /* source and dest address */ 72} __packed __aligned(2); 73 74#define IP_MAXPACKET 65535 /* maximum packet size */ 75 76/* 77 * Definitions for IP type of service (ip_tos). 78 */ 79#define IPTOS_LOWDELAY 0x10 80#define IPTOS_THROUGHPUT 0x08 81#define IPTOS_RELIABILITY 0x04 82#define IPTOS_MINCOST 0x02 83 84/* 85 * Definitions for IP precedence (also in ip_tos) (deprecated). 86 */ 87#define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7 88#define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6 89#define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5 90#define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4 91#define IPTOS_PREC_FLASH IPTOS_DSCP_CS3 92#define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2 93#define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1 94#define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0 95 96/* 97 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865. 98 */ 99#define IPTOS_DSCP_CS0 0x00 100#define IPTOS_DSCP_CS1 0x20 101#define IPTOS_DSCP_AF11 0x28 102#define IPTOS_DSCP_AF12 0x30 103#define IPTOS_DSCP_AF13 0x38 104#define IPTOS_DSCP_CS2 0x40 105#define IPTOS_DSCP_AF21 0x48 106#define IPTOS_DSCP_AF22 0x50 107#define IPTOS_DSCP_AF23 0x58 108#define IPTOS_DSCP_CS3 0x60 109#define IPTOS_DSCP_AF31 0x68 110#define IPTOS_DSCP_AF32 0x70 111#define IPTOS_DSCP_AF33 0x78 112#define IPTOS_DSCP_CS4 0x80 113#define IPTOS_DSCP_AF41 0x88 114#define IPTOS_DSCP_AF42 0x90 115#define IPTOS_DSCP_AF43 0x98 116#define IPTOS_DSCP_CS5 0xa0 117#define IPTOS_DSCP_VA 0xb0 118#define IPTOS_DSCP_EF 0xb8 119#define IPTOS_DSCP_CS6 0xc0 120#define IPTOS_DSCP_CS7 0xe0 121 122/* 123 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 124 * lower 2 bits of the TOS field. 125 */ 126#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 127#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 128#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 129#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 130#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 131 132/* 133 * Definitions for options. 134 */ 135#define IPOPT_COPIED(o) ((o)&0x80) 136#define IPOPT_CLASS(o) ((o)&0x60) 137#define IPOPT_NUMBER(o) ((o)&0x1f) 138 139#define IPOPT_CONTROL 0x00 140#define IPOPT_RESERVED1 0x20 141#define IPOPT_DEBMEAS 0x40 142#define IPOPT_RESERVED2 0x60 143 144#define IPOPT_EOL 0 /* end of option list */ 145#define IPOPT_NOP 1 /* no operation */ 146 147#define IPOPT_RR 7 /* record packet route */ 148#define IPOPT_TS 68 /* timestamp */ 149#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 150#define IPOPT_LSRR 131 /* loose source route */ 151#define IPOPT_ESO 133 /* extended security */ 152#define IPOPT_CIPSO 134 /* commercial security */ 153#define IPOPT_SATID 136 /* satnet id */ 154#define IPOPT_SSRR 137 /* strict source route */ 155#define IPOPT_RA 148 /* router alert */ 156 157/* 158 * Offsets to fields in options other than EOL and NOP. 159 */ 160#define IPOPT_OPTVAL 0 /* option ID */ 161#define IPOPT_OLEN 1 /* option length */ 162#define IPOPT_OFFSET 2 /* offset within option */ 163#define IPOPT_MINOFF 4 /* min value of above */ 164 165/* 166 * Time stamp option structure. 167 */ 168struct ip_timestamp { 169 u_char ipt_code; /* IPOPT_TS */ 170 u_char ipt_len; /* size of structure (variable) */ 171 u_char ipt_ptr; /* index of current entry */ 172#if BYTE_ORDER == LITTLE_ENDIAN 173 u_char ipt_flg:4, /* flags, see below */ 174 ipt_oflw:4; /* overflow counter */ 175#endif 176#if BYTE_ORDER == BIG_ENDIAN 177 u_char ipt_oflw:4, /* overflow counter */ 178 ipt_flg:4; /* flags, see below */ 179#endif 180 union ipt_timestamp { 181 uint32_t ipt_time[1]; /* network format */ 182 struct ipt_ta { 183 struct in_addr ipt_addr; 184 uint32_t ipt_time; /* network format */ 185 } ipt_ta[1]; 186 } ipt_timestamp; 187}; 188 189/* Flag bits for ipt_flg. */ 190#define IPOPT_TS_TSONLY 0 /* timestamps only */ 191#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 192#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 193 194/* Bits for security (not byte swapped). */ 195#define IPOPT_SECUR_UNCLASS 0x0000 196#define IPOPT_SECUR_CONFID 0xf135 197#define IPOPT_SECUR_EFTO 0x789a 198#define IPOPT_SECUR_MMMM 0xbc4d 199#define IPOPT_SECUR_RESTR 0xaf13 200#define IPOPT_SECUR_SECRET 0xd788 201#define IPOPT_SECUR_TOPSECRET 0x6bc5 202 203/* 204 * Internet implementation parameters. 205 */ 206#define MAXTTL 255 /* maximum time to live (seconds) */ 207#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 208#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 209#define IPTTLDEC 1 /* subtracted when forwarding */ 210#define IP_MSS 576 /* default maximum segment size */ 211 212/* 213 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 214 * checksums. For the Internet checksum, struct ipovly can be used instead. 215 * For stronger checksums, the real thing must be used. 216 */ 217struct ippseudo { 218 struct in_addr ippseudo_src; /* source internet address */ 219 struct in_addr ippseudo_dst; /* destination internet address */ 220 u_char ippseudo_pad; /* pad, must be zero */ 221 u_char ippseudo_p; /* protocol */ 222 u_short ippseudo_len; /* protocol length */ 223}; 224#endif 225