ip.h revision 172800
1/*- 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)ip.h 8.2 (Berkeley) 6/1/94 31 * $FreeBSD: head/sys/netinet/ip.h 172800 2007-10-19 12:46:15Z rpaulo $ 32 */ 33 34#ifndef _NETINET_IP_H_ 35#define _NETINET_IP_H_ 36 37#include <sys/cdefs.h> 38 39/* 40 * Definitions for internet protocol version 4. 41 * 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} __packed __aligned(4); 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 86/* 87 * Definitions for IP precedence (also in ip_tos) (hopefully unused). 88 */ 89#define IPTOS_PREC_NETCONTROL 0xe0 90#define IPTOS_PREC_INTERNETCONTROL 0xc0 91#define IPTOS_PREC_CRITIC_ECP 0xa0 92#define IPTOS_PREC_FLASHOVERRIDE 0x80 93#define IPTOS_PREC_FLASH 0x60 94#define IPTOS_PREC_IMMEDIATE 0x40 95#define IPTOS_PREC_PRIORITY 0x20 96#define IPTOS_PREC_ROUTINE 0x00 97 98/* 99 * ECN (Explicit Congestion Notification) codepoints in RFC3168 mapped to the 100 * lower 2 bits of the TOS field. 101 */ 102#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 103#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 104#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 105#define IPTOS_ECN_CE 0x03 /* congestion experienced */ 106#define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 107 108/* 109 * Definitions for options. 110 */ 111#define IPOPT_COPIED(o) ((o)&0x80) 112#define IPOPT_CLASS(o) ((o)&0x60) 113#define IPOPT_NUMBER(o) ((o)&0x1f) 114 115#define IPOPT_CONTROL 0x00 116#define IPOPT_RESERVED1 0x20 117#define IPOPT_DEBMEAS 0x40 118#define IPOPT_RESERVED2 0x60 119 120#define IPOPT_EOL 0 /* end of option list */ 121#define IPOPT_NOP 1 /* no operation */ 122 123#define IPOPT_RR 7 /* record packet route */ 124#define IPOPT_TS 68 /* timestamp */ 125#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 126#define IPOPT_LSRR 131 /* loose source route */ 127#define IPOPT_ESO 133 /* extended security */ 128#define IPOPT_CIPSO 134 /* commerical security */ 129#define IPOPT_SATID 136 /* satnet id */ 130#define IPOPT_SSRR 137 /* strict source route */ 131#define IPOPT_RA 148 /* router alert */ 132 133/* 134 * Offsets to fields in options other than EOL and NOP. 135 */ 136#define IPOPT_OPTVAL 0 /* option ID */ 137#define IPOPT_OLEN 1 /* option length */ 138#define IPOPT_OFFSET 2 /* offset within option */ 139#define IPOPT_MINOFF 4 /* min value of above */ 140 141/* 142 * Time stamp option structure. 143 */ 144struct ip_timestamp { 145 u_char ipt_code; /* IPOPT_TS */ 146 u_char ipt_len; /* size of structure (variable) */ 147 u_char ipt_ptr; /* index of current entry */ 148#if BYTE_ORDER == LITTLE_ENDIAN 149 u_int ipt_flg:4, /* flags, see below */ 150 ipt_oflw:4; /* overflow counter */ 151#endif 152#if BYTE_ORDER == BIG_ENDIAN 153 u_int ipt_oflw:4, /* overflow counter */ 154 ipt_flg:4; /* flags, see below */ 155#endif 156 union ipt_timestamp { 157 n_long ipt_time[1]; 158 struct ipt_ta { 159 struct in_addr ipt_addr; 160 n_long ipt_time; 161 } ipt_ta[1]; 162 } ipt_timestamp; 163}; 164 165/* Flag bits for ipt_flg. */ 166#define IPOPT_TS_TSONLY 0 /* timestamps only */ 167#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 168#define IPOPT_TS_PRESPEC 3 /* specified modules only */ 169 170/* Bits for security (not byte swapped). */ 171#define IPOPT_SECUR_UNCLASS 0x0000 172#define IPOPT_SECUR_CONFID 0xf135 173#define IPOPT_SECUR_EFTO 0x789a 174#define IPOPT_SECUR_MMMM 0xbc4d 175#define IPOPT_SECUR_RESTR 0xaf13 176#define IPOPT_SECUR_SECRET 0xd788 177#define IPOPT_SECUR_TOPSECRET 0x6bc5 178 179/* 180 * Internet implementation parameters. 181 */ 182#define MAXTTL 255 /* maximum time to live (seconds) */ 183#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 184#define IPFRAGTTL 60 /* time to live for frags, slowhz */ 185#define IPTTLDEC 1 /* subtracted when forwarding */ 186#define IP_MSS 576 /* default maximum segment size */ 187 188/* 189 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 190 * checksums. For the Internet checksum, struct ipovly can be used instead. 191 * For stronger checksums, the real thing must be used. 192 */ 193struct ippseudo { 194 struct in_addr ippseudo_src; /* source internet address */ 195 struct in_addr ippseudo_dst; /* destination internet address */ 196 u_char ippseudo_pad; /* pad, must be zero */ 197 u_char ippseudo_p; /* protocol */ 198 u_short ippseudo_len; /* protocol length */ 199}; 200#endif 201