ip.h revision 105586
1/* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)ip.h 8.2 (Berkeley) 6/1/94 34 * $FreeBSD: head/sys/netinet/ip.h 105586 2002-10-20 22:52:07Z phk $ 35 */ 36 37#ifndef _NETINET_IP_H_ 38#define _NETINET_IP_H_ 39 40/* 41 * Definitions for internet protocol version 4. 42 * Per RFC 791, September 1981. 43 */ 44#define IPVERSION 4 45 46/* 47 * Structure of an internet header, naked of options. 48 */ 49struct ip { 50#if BYTE_ORDER == LITTLE_ENDIAN 51 u_int ip_hl:4, /* header length */ 52 ip_v:4; /* version */ 53#endif 54#if BYTE_ORDER == BIG_ENDIAN 55 u_int ip_v:4, /* version */ 56 ip_hl:4; /* header length */ 57#endif 58 u_char ip_tos; /* type of service */ 59 u_short ip_len; /* total length */ 60 u_short ip_id; /* identification */ 61 u_short ip_off; /* fragment offset field */ 62#define IP_RF 0x8000 /* reserved fragment flag */ 63#define IP_DF 0x4000 /* dont fragment flag */ 64#define IP_MF 0x2000 /* more fragments flag */ 65#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 66 u_char ip_ttl; /* time to live */ 67 u_char ip_p; /* protocol */ 68 u_short ip_sum; /* checksum */ 69 struct in_addr ip_src,ip_dst; /* source and dest address */ 70} __attribute__((__packed__)); 71 72#ifdef CTASSERT 73CTASSERT(sizeof (struct ip) == 20); 74#endif 75 76#define IP_MAXPACKET 65535 /* maximum packet size */ 77 78/* 79 * Definitions for IP type of service (ip_tos) 80 */ 81#define IPTOS_LOWDELAY 0x10 82#define IPTOS_THROUGHPUT 0x08 83#define IPTOS_RELIABILITY 0x04 84#define IPTOS_MINCOST 0x02 85/* ECN bits proposed by Sally Floyd */ 86#define IPTOS_CE 0x01 /* congestion experienced */ 87#define IPTOS_ECT 0x02 /* ECN-capable transport */ 88 89 90/* 91 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 92 */ 93#define IPTOS_PREC_NETCONTROL 0xe0 94#define IPTOS_PREC_INTERNETCONTROL 0xc0 95#define IPTOS_PREC_CRITIC_ECP 0xa0 96#define IPTOS_PREC_FLASHOVERRIDE 0x80 97#define IPTOS_PREC_FLASH 0x60 98#define IPTOS_PREC_IMMEDIATE 0x40 99#define IPTOS_PREC_PRIORITY 0x20 100#define IPTOS_PREC_ROUTINE 0x00 101 102/* 103 * Definitions for options. 104 */ 105#define IPOPT_COPIED(o) ((o)&0x80) 106#define IPOPT_CLASS(o) ((o)&0x60) 107#define IPOPT_NUMBER(o) ((o)&0x1f) 108 109#define IPOPT_CONTROL 0x00 110#define IPOPT_RESERVED1 0x20 111#define IPOPT_DEBMEAS 0x40 112#define IPOPT_RESERVED2 0x60 113 114#define IPOPT_EOL 0 /* end of option list */ 115#define IPOPT_NOP 1 /* no operation */ 116 117#define IPOPT_RR 7 /* record packet route */ 118#define IPOPT_TS 68 /* timestamp */ 119#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 120#define IPOPT_LSRR 131 /* loose source route */ 121#define IPOPT_ESO 133 /* extended security */ 122#define IPOPT_CIPSO 134 /* commerical security */ 123#define IPOPT_SATID 136 /* satnet id */ 124#define IPOPT_SSRR 137 /* strict source route */ 125#define IPOPT_RA 148 /* router alert */ 126 127/* 128 * Offsets to fields in options other than EOL and NOP. 129 */ 130#define IPOPT_OPTVAL 0 /* option ID */ 131#define IPOPT_OLEN 1 /* option length */ 132#define IPOPT_OFFSET 2 /* offset within option */ 133#define IPOPT_MINOFF 4 /* min value of above */ 134 135/* 136 * Time stamp option structure. 137 */ 138struct ip_timestamp { 139 u_char ipt_code; /* IPOPT_TS */ 140 u_char ipt_len; /* size of structure (variable) */ 141 u_char ipt_ptr; /* index of current entry */ 142#if BYTE_ORDER == LITTLE_ENDIAN 143 u_int ipt_flg:4, /* flags, see below */ 144 ipt_oflw:4; /* overflow counter */ 145#endif 146#if BYTE_ORDER == BIG_ENDIAN 147 u_int ipt_oflw:4, /* overflow counter */ 148 ipt_flg:4; /* flags, see below */ 149#endif 150 union ipt_timestamp { 151 n_long ipt_time[1]; 152 struct ipt_ta { 153 struct in_addr ipt_addr; 154 n_long ipt_time; 155 } ipt_ta[1]; 156 } ipt_timestamp; 157}; 158 159/* flag bits for ipt_flg */ 160#define IPOPT_TS_TSONLY 0 /* timestamps only */ 161#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 162#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 163 164/* bits for security (not byte swapped) */ 165#define IPOPT_SECUR_UNCLASS 0x0000 166#define IPOPT_SECUR_CONFID 0xf135 167#define IPOPT_SECUR_EFTO 0x789a 168#define IPOPT_SECUR_MMMM 0xbc4d 169#define IPOPT_SECUR_RESTR 0xaf13 170#define IPOPT_SECUR_SECRET 0xd788 171#define IPOPT_SECUR_TOPSECRET 0x6bc5 172 173/* 174 * Internet implementation parameters. 175 */ 176#define MAXTTL 255 /* maximum time to live (seconds) */ 177#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 178#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 179#define IPTTLDEC 1 /* subtracted when forwarding */ 180 181#define IP_MSS 576 /* default maximum segment size */ 182 183#endif 184