ip.h revision 50477
1169695Skan/* 2169695Skan * Copyright (c) 1982, 1986, 1993 3169695Skan * The Regents of the University of California. All rights reserved. 4169695Skan * 5169695Skan * Redistribution and use in source and binary forms, with or without 6169695Skan * modification, are permitted provided that the following conditions 7169695Skan * are met: 8169695Skan * 1. Redistributions of source code must retain the above copyright 9169695Skan * notice, this list of conditions and the following disclaimer. 10169695Skan * 2. Redistributions in binary form must reproduce the above copyright 11169695Skan * notice, this list of conditions and the following disclaimer in the 12169695Skan * documentation and/or other materials provided with the distribution. 13169695Skan * 3. All advertising materials mentioning features or use of this software 14169695Skan * must display the following acknowledgement: 15169695Skan * This product includes software developed by the University of 16169695Skan * California, Berkeley and its contributors. 17169695Skan * 4. Neither the name of the University nor the names of its contributors 18169695Skan * may be used to endorse or promote products derived from this software 19169695Skan * without specific prior written permission. 20169695Skan * 21169695Skan * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22169695Skan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23169695Skan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24169695Skan * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25169695Skan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26169695Skan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27169695Skan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28169695Skan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29169695Skan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30169695Skan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31169695Skan * SUCH DAMAGE. 32169695Skan * 33169695Skan * @(#)ip.h 8.2 (Berkeley) 6/1/94 34169695Skan * $FreeBSD: head/sys/netinet/ip.h 50477 1999-08-28 01:08:13Z peter $ 35169695Skan */ 36169695Skan 37169695Skan#ifndef _NETINET_IP_H_ 38169695Skan#define _NETINET_IP_H_ 39169695Skan 40169695Skan/* 41169695Skan * Definitions for internet protocol version 4. 42169695Skan * Per RFC 791, September 1981. 43169695Skan */ 44169695Skan#define IPVERSION 4 45169695Skan 46169695Skan/* 47169695Skan * Structure of an internet header, naked of options. 48169695Skan */ 49169695Skanstruct ip { 50169695Skan#ifdef _IP_VHL 51169695Skan u_char ip_vhl; /* version << 4 | header length >> 2 */ 52169695Skan#else 53169695Skan#if BYTE_ORDER == LITTLE_ENDIAN 54169695Skan u_int ip_hl:4, /* header length */ 55169695Skan ip_v:4; /* version */ 56169695Skan#endif 57169695Skan#if BYTE_ORDER == BIG_ENDIAN 58169695Skan u_int ip_v:4, /* version */ 59169695Skan ip_hl:4; /* header length */ 60169695Skan#endif 61169695Skan#endif /* not _IP_VHL */ 62169695Skan u_char ip_tos; /* type of service */ 63169695Skan u_short ip_len; /* total length */ 64169695Skan u_short ip_id; /* identification */ 65169695Skan u_short ip_off; /* fragment offset field */ 66169695Skan#define IP_RF 0x8000 /* reserved fragment flag */ 67169695Skan#define IP_DF 0x4000 /* dont fragment flag */ 68169695Skan#define IP_MF 0x2000 /* more fragments flag */ 69169695Skan#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 70169695Skan u_char ip_ttl; /* time to live */ 71169695Skan u_char ip_p; /* protocol */ 72169695Skan u_short ip_sum; /* checksum */ 73169695Skan struct in_addr ip_src,ip_dst; /* source and dest address */ 74169695Skan}; 75169695Skan 76169695Skan#ifdef _IP_VHL 77169695Skan#define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 78169695Skan#define IP_VHL_HL(vhl) ((vhl) & 0x0f) 79169695Skan#define IP_VHL_V(vhl) ((vhl) >> 4) 80169695Skan#define IP_VHL_BORING 0x45 81169695Skan#endif 82169695Skan 83169695Skan#define IP_MAXPACKET 65535 /* maximum packet size */ 84169695Skan 85169695Skan/* 86169695Skan * Definitions for IP type of service (ip_tos) 87169695Skan */ 88169695Skan#define IPTOS_LOWDELAY 0x10 89169695Skan#define IPTOS_THROUGHPUT 0x08 90169695Skan#define IPTOS_RELIABILITY 0x04 91169695Skan#define IPTOS_MINCOST 0x02 92169695Skan 93169695Skan/* 94169695Skan * Definitions for IP precedence (also in ip_tos) (hopefully unused) 95169695Skan */ 96169695Skan#define IPTOS_PREC_NETCONTROL 0xe0 97169695Skan#define IPTOS_PREC_INTERNETCONTROL 0xc0 98169695Skan#define IPTOS_PREC_CRITIC_ECP 0xa0 99169695Skan#define IPTOS_PREC_FLASHOVERRIDE 0x80 100169695Skan#define IPTOS_PREC_FLASH 0x60 101169695Skan#define IPTOS_PREC_IMMEDIATE 0x40 102169695Skan#define IPTOS_PREC_PRIORITY 0x20 103169695Skan#define IPTOS_PREC_ROUTINE 0x00 104169695Skan 105169695Skan/* 106169695Skan * Definitions for options. 107169695Skan */ 108169695Skan#define IPOPT_COPIED(o) ((o)&0x80) 109169695Skan#define IPOPT_CLASS(o) ((o)&0x60) 110169695Skan#define IPOPT_NUMBER(o) ((o)&0x1f) 111169695Skan 112169695Skan#define IPOPT_CONTROL 0x00 113169695Skan#define IPOPT_RESERVED1 0x20 114169695Skan#define IPOPT_DEBMEAS 0x40 115169695Skan#define IPOPT_RESERVED2 0x60 116169695Skan 117169695Skan#define IPOPT_EOL 0 /* end of option list */ 118169695Skan#define IPOPT_NOP 1 /* no operation */ 119169695Skan 120169695Skan#define IPOPT_RR 7 /* record packet route */ 121169695Skan#define IPOPT_TS 68 /* timestamp */ 122169695Skan#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 123169695Skan#define IPOPT_LSRR 131 /* loose source route */ 124169695Skan#define IPOPT_SATID 136 /* satnet id */ 125169695Skan#define IPOPT_SSRR 137 /* strict source route */ 126169695Skan#define IPOPT_RA 148 /* router alert */ 127169695Skan 128169695Skan/* 129169695Skan * Offsets to fields in options other than EOL and NOP. 130169695Skan */ 131169695Skan#define IPOPT_OPTVAL 0 /* option ID */ 132169695Skan#define IPOPT_OLEN 1 /* option length */ 133169695Skan#define IPOPT_OFFSET 2 /* offset within option */ 134169695Skan#define IPOPT_MINOFF 4 /* min value of above */ 135169695Skan 136169695Skan/* 137169695Skan * Time stamp option structure. 138169695Skan */ 139169695Skanstruct ip_timestamp { 140169695Skan u_char ipt_code; /* IPOPT_TS */ 141169695Skan u_char ipt_len; /* size of structure (variable) */ 142169695Skan u_char ipt_ptr; /* index of current entry */ 143169695Skan#if BYTE_ORDER == LITTLE_ENDIAN 144169695Skan u_int ipt_flg:4, /* flags, see below */ 145169695Skan ipt_oflw:4; /* overflow counter */ 146169695Skan#endif 147169695Skan#if BYTE_ORDER == BIG_ENDIAN 148169695Skan u_int ipt_oflw:4, /* overflow counter */ 149169695Skan ipt_flg:4; /* flags, see below */ 150169695Skan#endif 151169695Skan union ipt_timestamp { 152169695Skan n_long ipt_time[1]; 153169695Skan struct ipt_ta { 154169695Skan struct in_addr ipt_addr; 155169695Skan n_long ipt_time; 156169695Skan } ipt_ta[1]; 157169695Skan } ipt_timestamp; 158169695Skan}; 159169695Skan 160169695Skan/* flag bits for ipt_flg */ 161169695Skan#define IPOPT_TS_TSONLY 0 /* timestamps only */ 162169695Skan#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 163169695Skan#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 164169695Skan 165169695Skan/* bits for security (not byte swapped) */ 166169695Skan#define IPOPT_SECUR_UNCLASS 0x0000 167169695Skan#define IPOPT_SECUR_CONFID 0xf135 168169695Skan#define IPOPT_SECUR_EFTO 0x789a 169169695Skan#define IPOPT_SECUR_MMMM 0xbc4d 170169695Skan#define IPOPT_SECUR_RESTR 0xaf13 171169695Skan#define IPOPT_SECUR_SECRET 0xd788 172169695Skan#define IPOPT_SECUR_TOPSECRET 0x6bc5 173169695Skan 174169695Skan/* 175169695Skan * Internet implementation parameters. 176169695Skan */ 177169695Skan#define MAXTTL 255 /* maximum time to live (seconds) */ 178169695Skan#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 179169695Skan#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 180169695Skan#define IPTTLDEC 1 /* subtracted when forwarding */ 181169695Skan 182169695Skan#define IP_MSS 576 /* default maximum segment size */ 183169695Skan 184169695Skan#endif 185169695Skan