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 */ 35#ifndef WIN32 36#include <endian.h> 37#else 38#ifndef LITTLE_ENDIAN 39#define LITTLE_ENDIAN 1234 40#define BIG_ENDIAN 4321 41#define BYTE_ORDER LITTLE_ENDIAN 42#endif 43#endif 44 45/* 46 * Definitions for internet protocol version 4. 47 * Per RFC 791, September 1981. 48 */ 49#define IPVERSION 4 50 51/* 52 * Structure of an internet header, naked of options. 53 * 54 * We declare ip_len and ip_off to be short, rather than u_short 55 * pragmatically since otherwise unsigned comparisons can result 56 * against negative integers quite easily, and fail in subtle ways. 57 */ 58struct ip { 59#if BYTE_ORDER == LITTLE_ENDIAN 60 u_char ip_hl:4, /* header length */ 61 ip_v:4; /* version */ 62#endif 63#if BYTE_ORDER == BIG_ENDIAN 64 u_char ip_v:4, /* version */ 65 ip_hl:4; /* header length */ 66#endif 67 u_char ip_tos; /* type of service */ 68 short ip_len; /* total length */ 69 u_short ip_id; /* identification */ 70 short ip_off; /* fragment offset field */ 71#define IP_DF 0x4000 /* dont fragment flag */ 72#define IP_MF 0x2000 /* more fragments flag */ 73#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 74 u_char ip_ttl; /* time to live */ 75 u_char ip_p; /* protocol */ 76 u_short ip_sum; /* checksum */ 77 struct in_addr ip_src,ip_dst; /* source and dest address */ 78}; 79 80#define IP_MAXPACKET 65535 /* maximum packet size */ 81 82/* 83 * Definitions for IP type of service (ip_tos) 84 */ 85#define IPTOS_LOWDELAY 0x10 86#define IPTOS_THROUGHPUT 0x08 87#define IPTOS_RELIABILITY 0x04 88 89/* 90 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 91 */ 92#define IPTOS_PREC_NETCONTROL 0xe0 93#define IPTOS_PREC_INTERNETCONTROL 0xc0 94#define IPTOS_PREC_CRITIC_ECP 0xa0 95#define IPTOS_PREC_FLASHOVERRIDE 0x80 96#define IPTOS_PREC_FLASH 0x60 97#define IPTOS_PREC_IMMEDIATE 0x40 98#define IPTOS_PREC_PRIORITY 0x20 99#define IPTOS_PREC_ROUTINE 0x00 100 101/* 102 * Definitions for options. 103 */ 104#define IPOPT_COPIED(o) ((o)&0x80) 105#define IPOPT_CLASS(o) ((o)&0x60) 106#define IPOPT_NUMBER(o) ((o)&0x1f) 107 108#define IPOPT_CONTROL 0x00 109#define IPOPT_RESERVED1 0x20 110#define IPOPT_DEBMEAS 0x40 111#define IPOPT_RESERVED2 0x60 112 113#define IPOPT_EOL 0 /* end of option list */ 114#define IPOPT_NOP 1 /* no operation */ 115 116#define IPOPT_RR 7 /* record packet route */ 117#define IPOPT_TS 68 /* timestamp */ 118#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 119#define IPOPT_LSRR 131 /* loose source route */ 120#define IPOPT_SATID 136 /* satnet id */ 121#define IPOPT_SSRR 137 /* strict source route */ 122 123/* 124 * Offsets to fields in options other than EOL and NOP. 125 */ 126#define IPOPT_OPTVAL 0 /* option ID */ 127#define IPOPT_OLEN 1 /* option length */ 128#define IPOPT_OFFSET 2 /* offset within option */ 129#define IPOPT_MINOFF 4 /* min value of above */ 130 131/* 132 * Time stamp option structure. 133 */ 134struct ip_timestamp { 135 u_char ipt_code; /* IPOPT_TS */ 136 u_char ipt_len; /* size of structure (variable) */ 137 u_char ipt_ptr; /* index of current entry */ 138#if BYTE_ORDER == LITTLE_ENDIAN 139 u_char ipt_flg:4, /* flags, see below */ 140 ipt_oflw:4; /* overflow counter */ 141#endif 142#if BYTE_ORDER == BIG_ENDIAN 143 u_char ipt_oflw:4, /* overflow counter */ 144 ipt_flg:4; /* flags, see below */ 145#endif 146 union ipt_timestamp { 147 n_long ipt_time[1]; 148 struct ipt_ta { 149 struct in_addr ipt_addr; 150 n_long ipt_time; 151 } ipt_ta[1]; 152 } ipt_timestamp; 153}; 154 155/* flag bits for ipt_flg */ 156#define IPOPT_TS_TSONLY 0 /* timestamps only */ 157#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 158#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 159 160/* bits for security (not byte swapped) */ 161#define IPOPT_SECUR_UNCLASS 0x0000 162#define IPOPT_SECUR_CONFID 0xf135 163#define IPOPT_SECUR_EFTO 0x789a 164#define IPOPT_SECUR_MMMM 0xbc4d 165#define IPOPT_SECUR_RESTR 0xaf13 166#define IPOPT_SECUR_SECRET 0xd788 167#define IPOPT_SECUR_TOPSECRET 0x6bc5 168 169/* 170 * Internet implementation parameters. 171 */ 172#define MAXTTL 255 /* maximum time to live (seconds) */ 173#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 174#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 175#define IPTTLDEC 1 /* subtracted when forwarding */ 176 177#define IP_MSS 576 /* default maximum segment size */ 178