ip.h revision 125870
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 3310942Swollman * @(#)ip.h 8.2 (Berkeley) 6/1/94 3450477Speter * $FreeBSD: head/sys/netinet/ip.h 125870 2004-02-16 14:40:56Z bms $ 351541Srgrimes */ 361541Srgrimes 372169Spaul#ifndef _NETINET_IP_H_ 382169Spaul#define _NETINET_IP_H_ 392169Spaul 40112482Smux#include <sys/cdefs.h> 41112482Smux 421541Srgrimes/* 431541Srgrimes * Definitions for internet protocol version 4. 441541Srgrimes * Per RFC 791, September 1981. 451541Srgrimes */ 461541Srgrimes#define IPVERSION 4 471541Srgrimes 481541Srgrimes/* 491541Srgrimes * Structure of an internet header, naked of options. 501541Srgrimes */ 511541Srgrimesstruct ip { 528876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 5336725Sbde u_int ip_hl:4, /* header length */ 541541Srgrimes ip_v:4; /* version */ 551541Srgrimes#endif 568876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 5736725Sbde u_int ip_v:4, /* version */ 581541Srgrimes ip_hl:4; /* header length */ 591541Srgrimes#endif 601541Srgrimes u_char ip_tos; /* type of service */ 6119136Swollman u_short ip_len; /* total length */ 621541Srgrimes u_short ip_id; /* identification */ 6319136Swollman u_short ip_off; /* fragment offset field */ 6433851Sdima#define IP_RF 0x8000 /* reserved fragment flag */ 651541Srgrimes#define IP_DF 0x4000 /* dont fragment flag */ 661541Srgrimes#define IP_MF 0x2000 /* more fragments flag */ 671541Srgrimes#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 681541Srgrimes u_char ip_ttl; /* time to live */ 691541Srgrimes u_char ip_p; /* protocol */ 701541Srgrimes u_short ip_sum; /* checksum */ 711541Srgrimes struct in_addr ip_src,ip_dst; /* source and dest address */ 72112482Smux} __packed; 731541Srgrimes 74105586Sphk#ifdef CTASSERT 75105586SphkCTASSERT(sizeof (struct ip) == 20); 7615294Swollman#endif 7715294Swollman 781541Srgrimes#define IP_MAXPACKET 65535 /* maximum packet size */ 791541Srgrimes 801541Srgrimes/* 811541Srgrimes * Definitions for IP type of service (ip_tos) 821541Srgrimes */ 831541Srgrimes#define IPTOS_LOWDELAY 0x10 841541Srgrimes#define IPTOS_THROUGHPUT 0x08 851541Srgrimes#define IPTOS_RELIABILITY 0x04 868293Sache#define IPTOS_MINCOST 0x02 87121684Sume#if 1 88121684Sume/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 89121684Sume#define IPTOS_CE 0x01 90121684Sume#define IPTOS_ECT 0x02 91121684Sume#endif 921541Srgrimes 931541Srgrimes/* 941541Srgrimes * Definitions for IP precedence (also in ip_tos) (hopefully unused) 951541Srgrimes */ 961541Srgrimes#define IPTOS_PREC_NETCONTROL 0xe0 971541Srgrimes#define IPTOS_PREC_INTERNETCONTROL 0xc0 981541Srgrimes#define IPTOS_PREC_CRITIC_ECP 0xa0 991541Srgrimes#define IPTOS_PREC_FLASHOVERRIDE 0x80 1001541Srgrimes#define IPTOS_PREC_FLASH 0x60 1011541Srgrimes#define IPTOS_PREC_IMMEDIATE 0x40 1021541Srgrimes#define IPTOS_PREC_PRIORITY 0x20 1038293Sache#define IPTOS_PREC_ROUTINE 0x00 1041541Srgrimes 1051541Srgrimes/* 106121684Sume * ECN (Explicit Congestion Notification) codepoints in RFC3168 107121684Sume * mapped to the lower 2 bits of the TOS field. 108121684Sume */ 109121684Sume#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 110121684Sume#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 111121684Sume#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 112121684Sume#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 113121684Sume#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 114121684Sume 115121684Sume/* 1161541Srgrimes * Definitions for options. 1171541Srgrimes */ 1181541Srgrimes#define IPOPT_COPIED(o) ((o)&0x80) 1191541Srgrimes#define IPOPT_CLASS(o) ((o)&0x60) 1201541Srgrimes#define IPOPT_NUMBER(o) ((o)&0x1f) 1211541Srgrimes 1221541Srgrimes#define IPOPT_CONTROL 0x00 1231541Srgrimes#define IPOPT_RESERVED1 0x20 1241541Srgrimes#define IPOPT_DEBMEAS 0x40 1251541Srgrimes#define IPOPT_RESERVED2 0x60 1261541Srgrimes 1271541Srgrimes#define IPOPT_EOL 0 /* end of option list */ 1281541Srgrimes#define IPOPT_NOP 1 /* no operation */ 1291541Srgrimes 1301541Srgrimes#define IPOPT_RR 7 /* record packet route */ 1311541Srgrimes#define IPOPT_TS 68 /* timestamp */ 1321541Srgrimes#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 1331541Srgrimes#define IPOPT_LSRR 131 /* loose source route */ 13487919Srwatson#define IPOPT_ESO 133 /* extended security */ 13587917Srwatson#define IPOPT_CIPSO 134 /* commerical security */ 1361541Srgrimes#define IPOPT_SATID 136 /* satnet id */ 1371541Srgrimes#define IPOPT_SSRR 137 /* strict source route */ 13814622Sfenner#define IPOPT_RA 148 /* router alert */ 1391541Srgrimes 1401541Srgrimes/* 1411541Srgrimes * Offsets to fields in options other than EOL and NOP. 1421541Srgrimes */ 1431541Srgrimes#define IPOPT_OPTVAL 0 /* option ID */ 1441541Srgrimes#define IPOPT_OLEN 1 /* option length */ 1451541Srgrimes#define IPOPT_OFFSET 2 /* offset within option */ 1461541Srgrimes#define IPOPT_MINOFF 4 /* min value of above */ 1471541Srgrimes 1481541Srgrimes/* 1491541Srgrimes * Time stamp option structure. 1501541Srgrimes */ 1511541Srgrimesstruct ip_timestamp { 1521541Srgrimes u_char ipt_code; /* IPOPT_TS */ 1531541Srgrimes u_char ipt_len; /* size of structure (variable) */ 1541541Srgrimes u_char ipt_ptr; /* index of current entry */ 1558876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 15636725Sbde u_int ipt_flg:4, /* flags, see below */ 1571541Srgrimes ipt_oflw:4; /* overflow counter */ 1581541Srgrimes#endif 1598876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 16036725Sbde u_int ipt_oflw:4, /* overflow counter */ 1611541Srgrimes ipt_flg:4; /* flags, see below */ 1621541Srgrimes#endif 1631541Srgrimes union ipt_timestamp { 1641541Srgrimes n_long ipt_time[1]; 1651541Srgrimes struct ipt_ta { 1661541Srgrimes struct in_addr ipt_addr; 1671541Srgrimes n_long ipt_time; 1681541Srgrimes } ipt_ta[1]; 1691541Srgrimes } ipt_timestamp; 1701541Srgrimes}; 1711541Srgrimes 1721541Srgrimes/* flag bits for ipt_flg */ 1731541Srgrimes#define IPOPT_TS_TSONLY 0 /* timestamps only */ 1741541Srgrimes#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 1751541Srgrimes#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 1761541Srgrimes 1771541Srgrimes/* bits for security (not byte swapped) */ 1781541Srgrimes#define IPOPT_SECUR_UNCLASS 0x0000 1791541Srgrimes#define IPOPT_SECUR_CONFID 0xf135 1801541Srgrimes#define IPOPT_SECUR_EFTO 0x789a 1811541Srgrimes#define IPOPT_SECUR_MMMM 0xbc4d 1821541Srgrimes#define IPOPT_SECUR_RESTR 0xaf13 1831541Srgrimes#define IPOPT_SECUR_SECRET 0xd788 1841541Srgrimes#define IPOPT_SECUR_TOPSECRET 0x6bc5 1851541Srgrimes 1861541Srgrimes/* 1871541Srgrimes * Internet implementation parameters. 1881541Srgrimes */ 1891541Srgrimes#define MAXTTL 255 /* maximum time to live (seconds) */ 1901541Srgrimes#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 1911541Srgrimes#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 1921541Srgrimes#define IPTTLDEC 1 /* subtracted when forwarding */ 1931541Srgrimes 1941541Srgrimes#define IP_MSS 576 /* default maximum segment size */ 1952169Spaul 196125680Sbms/* 197125680Sbms * This is the real IPv4 pseudo header, used for computing the TCP and UDP 198125680Sbms * checksums. For the Internet checksum, struct ipovly can be used instead. 199125680Sbms * For stronger checksums, the real thing must be used. 200125680Sbms */ 201125680Sbmsstruct ippseudo { 202125680Sbms struct in_addr ippseudo_src; /* source internet address */ 203125680Sbms struct in_addr ippseudo_dst; /* destination internet address */ 204125870Sbms u_char ippseudo_pad; /* pad, must be zero */ 205125870Sbms u_char ippseudo_p; /* protocol */ 206125870Sbms u_short ippseudo_len; /* protocol length */ 207125870Sbms}; 2082169Spaul#endif 209