ip.h revision 14622
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 3414622Sfenner * $Id: ip.h,v 1.7 1995/12/21 21:20:27 wollman Exp $ 351541Srgrimes */ 361541Srgrimes 372169Spaul#ifndef _NETINET_IP_H_ 382169Spaul#define _NETINET_IP_H_ 392169Spaul 401541Srgrimes/* 411541Srgrimes * Definitions for internet protocol version 4. 421541Srgrimes * Per RFC 791, September 1981. 431541Srgrimes */ 441541Srgrimes#define IPVERSION 4 451541Srgrimes 461541Srgrimes/* 471541Srgrimes * Structure of an internet header, naked of options. 481541Srgrimes * 491541Srgrimes * We declare ip_len and ip_off to be short, rather than u_short 501541Srgrimes * pragmatically since otherwise unsigned comparisons can result 511541Srgrimes * against negative integers quite easily, and fail in subtle ways. 521541Srgrimes */ 531541Srgrimesstruct ip { 5412956Swollman#ifdef _IP_VHL 5512956Swollman u_char ip_vhl; /* version << 4 | header length >> 2 */ 5612956Swollman#else 578876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 581541Srgrimes u_char ip_hl:4, /* header length */ 591541Srgrimes ip_v:4; /* version */ 601541Srgrimes#endif 618876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 621541Srgrimes u_char ip_v:4, /* version */ 631541Srgrimes ip_hl:4; /* header length */ 641541Srgrimes#endif 6512956Swollman#endif /* not _IP_VHL */ 661541Srgrimes u_char ip_tos; /* type of service */ 671541Srgrimes short ip_len; /* total length */ 681541Srgrimes u_short ip_id; /* identification */ 691541Srgrimes short ip_off; /* fragment offset field */ 701541Srgrimes#define IP_DF 0x4000 /* dont fragment flag */ 711541Srgrimes#define IP_MF 0x2000 /* more fragments flag */ 721541Srgrimes#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 731541Srgrimes u_char ip_ttl; /* time to live */ 741541Srgrimes u_char ip_p; /* protocol */ 751541Srgrimes u_short ip_sum; /* checksum */ 761541Srgrimes struct in_addr ip_src,ip_dst; /* source and dest address */ 771541Srgrimes}; 781541Srgrimes 791541Srgrimes#define IP_MAXPACKET 65535 /* maximum packet size */ 801541Srgrimes 811541Srgrimes/* 821541Srgrimes * Definitions for IP type of service (ip_tos) 831541Srgrimes */ 841541Srgrimes#define IPTOS_LOWDELAY 0x10 851541Srgrimes#define IPTOS_THROUGHPUT 0x08 861541Srgrimes#define IPTOS_RELIABILITY 0x04 878293Sache#define IPTOS_MINCOST 0x02 881541Srgrimes 891541Srgrimes/* 901541Srgrimes * Definitions for IP precedence (also in ip_tos) (hopefully unused) 911541Srgrimes */ 921541Srgrimes#define IPTOS_PREC_NETCONTROL 0xe0 931541Srgrimes#define IPTOS_PREC_INTERNETCONTROL 0xc0 941541Srgrimes#define IPTOS_PREC_CRITIC_ECP 0xa0 951541Srgrimes#define IPTOS_PREC_FLASHOVERRIDE 0x80 961541Srgrimes#define IPTOS_PREC_FLASH 0x60 971541Srgrimes#define IPTOS_PREC_IMMEDIATE 0x40 981541Srgrimes#define IPTOS_PREC_PRIORITY 0x20 998293Sache#define IPTOS_PREC_ROUTINE 0x00 1001541Srgrimes 1011541Srgrimes/* 1021541Srgrimes * Definitions for options. 1031541Srgrimes */ 1041541Srgrimes#define IPOPT_COPIED(o) ((o)&0x80) 1051541Srgrimes#define IPOPT_CLASS(o) ((o)&0x60) 1061541Srgrimes#define IPOPT_NUMBER(o) ((o)&0x1f) 1071541Srgrimes 1081541Srgrimes#define IPOPT_CONTROL 0x00 1091541Srgrimes#define IPOPT_RESERVED1 0x20 1101541Srgrimes#define IPOPT_DEBMEAS 0x40 1111541Srgrimes#define IPOPT_RESERVED2 0x60 1121541Srgrimes 1131541Srgrimes#define IPOPT_EOL 0 /* end of option list */ 1141541Srgrimes#define IPOPT_NOP 1 /* no operation */ 1151541Srgrimes 1161541Srgrimes#define IPOPT_RR 7 /* record packet route */ 1171541Srgrimes#define IPOPT_TS 68 /* timestamp */ 1181541Srgrimes#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 1191541Srgrimes#define IPOPT_LSRR 131 /* loose source route */ 1201541Srgrimes#define IPOPT_SATID 136 /* satnet id */ 1211541Srgrimes#define IPOPT_SSRR 137 /* strict source route */ 12214622Sfenner#define IPOPT_RA 148 /* router alert */ 1231541Srgrimes 1241541Srgrimes/* 1251541Srgrimes * Offsets to fields in options other than EOL and NOP. 1261541Srgrimes */ 1271541Srgrimes#define IPOPT_OPTVAL 0 /* option ID */ 1281541Srgrimes#define IPOPT_OLEN 1 /* option length */ 1291541Srgrimes#define IPOPT_OFFSET 2 /* offset within option */ 1301541Srgrimes#define IPOPT_MINOFF 4 /* min value of above */ 1311541Srgrimes 1321541Srgrimes/* 1331541Srgrimes * Time stamp option structure. 1341541Srgrimes */ 1351541Srgrimesstruct ip_timestamp { 1361541Srgrimes u_char ipt_code; /* IPOPT_TS */ 1371541Srgrimes u_char ipt_len; /* size of structure (variable) */ 1381541Srgrimes u_char ipt_ptr; /* index of current entry */ 1398876Srgrimes#if BYTE_ORDER == LITTLE_ENDIAN 1401541Srgrimes u_char ipt_flg:4, /* flags, see below */ 1411541Srgrimes ipt_oflw:4; /* overflow counter */ 1421541Srgrimes#endif 1438876Srgrimes#if BYTE_ORDER == BIG_ENDIAN 1441541Srgrimes u_char ipt_oflw:4, /* overflow counter */ 1451541Srgrimes ipt_flg:4; /* flags, see below */ 1461541Srgrimes#endif 1471541Srgrimes union ipt_timestamp { 1481541Srgrimes n_long ipt_time[1]; 1491541Srgrimes struct ipt_ta { 1501541Srgrimes struct in_addr ipt_addr; 1511541Srgrimes n_long ipt_time; 1521541Srgrimes } ipt_ta[1]; 1531541Srgrimes } ipt_timestamp; 1541541Srgrimes}; 1551541Srgrimes 1561541Srgrimes/* flag bits for ipt_flg */ 1571541Srgrimes#define IPOPT_TS_TSONLY 0 /* timestamps only */ 1581541Srgrimes#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 1591541Srgrimes#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 1601541Srgrimes 1611541Srgrimes/* bits for security (not byte swapped) */ 1621541Srgrimes#define IPOPT_SECUR_UNCLASS 0x0000 1631541Srgrimes#define IPOPT_SECUR_CONFID 0xf135 1641541Srgrimes#define IPOPT_SECUR_EFTO 0x789a 1651541Srgrimes#define IPOPT_SECUR_MMMM 0xbc4d 1661541Srgrimes#define IPOPT_SECUR_RESTR 0xaf13 1671541Srgrimes#define IPOPT_SECUR_SECRET 0xd788 1681541Srgrimes#define IPOPT_SECUR_TOPSECRET 0x6bc5 1691541Srgrimes 1701541Srgrimes/* 1711541Srgrimes * Internet implementation parameters. 1721541Srgrimes */ 1731541Srgrimes#define MAXTTL 255 /* maximum time to live (seconds) */ 1741541Srgrimes#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 1751541Srgrimes#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 1761541Srgrimes#define IPTTLDEC 1 /* subtracted when forwarding */ 1771541Srgrimes 1781541Srgrimes#define IP_MSS 576 /* default maximum segment size */ 1792169Spaul 1802169Spaul#endif 181