1 /* 2 * Copyright (c) 1982, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Portions copyright (c) 1999, 2000 6 * Intel Corporation. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * 23 * This product includes software developed by the University of 24 * California, Berkeley, Intel Corporation, and its contributors. 25 * 26 * 4. Neither the name of University, Intel Corporation, or their respective 27 * contributors may be used to endorse or promote products derived from 28 * this software without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND 31 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 32 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS, 34 * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 37 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 38 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 39 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 40 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 41 * 42 * @(#)ip.h 8.2 (Berkeley) 6/1/94 43 * $Id: ip.h,v 1.1.1.1 2006/05/30 06:12:48 hhzhou Exp $ 44 */ 45 46 #ifndef _NETINET_IP_H_ 47 #define _NETINET_IP_H_ 48 49 #ifndef _ORG_FREEBSD_ 50 #define _IP_VHL 51 #endif 52 53 /* 54 * Definitions for internet protocol version 4. 55 * Per RFC 791, September 1981. 56 */ 57 #define IPVERSION 4 58 59 /* 60 * Structure of an internet header, naked of options. 61 */ 62 struct ip { 63 #ifdef _IP_VHL 64 u_char ip_vhl; /* version << 4 | header length >> 2 */ 65 #else 66 #if BYTE_ORDER == LITTLE_ENDIAN 67 u_int ip_hl:4, /* header length */ 68 ip_v:4; /* version */ 69 #endif 70 #if BYTE_ORDER == BIG_ENDIAN 71 u_int ip_v:4, /* version */ 72 ip_hl:4; /* header length */ 73 #endif 74 #endif /* not _IP_VHL */ 75 u_char ip_tos; /* type of service */ 76 u_short ip_len; /* total length */ 77 u_short ip_id; /* identification */ 78 u_short ip_off; /* fragment offset field */ 79 #define IP_RF 0x8000 /* reserved fragment flag */ 80 #define IP_DF 0x4000 /* dont fragment flag */ 81 #define IP_MF 0x2000 /* more fragments flag */ 82 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 83 u_char ip_ttl; /* time to live */ 84 u_char ip_p; /* protocol */ 85 u_short ip_sum; /* checksum */ 86 struct in_addr ip_src,ip_dst; /* source and dest address */ 87 }; 88 89 #ifdef _IP_VHL 90 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 91 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 92 #define IP_VHL_V(vhl) ((vhl) >> 4) 93 #define IP_VHL_BORING 0x45 94 #endif 95 96 #define IP_MAXPACKET 65535 /* maximum packet size */ 97 98 /* 99 * Definitions for IP type of service (ip_tos) 100 */ 101 #define IPTOS_LOWDELAY 0x10 102 #define IPTOS_THROUGHPUT 0x08 103 #define IPTOS_RELIABILITY 0x04 104 #define IPTOS_MINCOST 0x02 105 106 /* 107 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 108 */ 109 #define IPTOS_PREC_NETCONTROL 0xe0 110 #define IPTOS_PREC_INTERNETCONTROL 0xc0 111 #define IPTOS_PREC_CRITIC_ECP 0xa0 112 #define IPTOS_PREC_FLASHOVERRIDE 0x80 113 #define IPTOS_PREC_FLASH 0x60 114 #define IPTOS_PREC_IMMEDIATE 0x40 115 #define IPTOS_PREC_PRIORITY 0x20 116 #define IPTOS_PREC_ROUTINE 0x00 117 118 /* 119 * Definitions for options. 120 */ 121 #define IPOPT_COPIED(o) ((o)&0x80) 122 #define IPOPT_CLASS(o) ((o)&0x60) 123 #define IPOPT_NUMBER(o) ((o)&0x1f) 124 125 #define IPOPT_CONTROL 0x00 126 #define IPOPT_RESERVED1 0x20 127 #define IPOPT_DEBMEAS 0x40 128 #define IPOPT_RESERVED2 0x60 129 130 #define IPOPT_EOL 0 /* end of option list */ 131 #define IPOPT_NOP 1 /* no operation */ 132 133 #define IPOPT_RR 7 /* record packet route */ 134 #define IPOPT_TS 68 /* timestamp */ 135 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 136 #define IPOPT_LSRR 131 /* loose source route */ 137 #define IPOPT_SATID 136 /* satnet id */ 138 #define IPOPT_SSRR 137 /* strict source route */ 139 #define IPOPT_RA 148 /* router alert */ 140 141 /* 142 * Offsets to fields in options other than EOL and NOP. 143 */ 144 #define IPOPT_OPTVAL 0 /* option ID */ 145 #define IPOPT_OLEN 1 /* option length */ 146 #define IPOPT_OFFSET 2 /* offset within option */ 147 #define IPOPT_MINOFF 4 /* min value of above */ 148 149 /* 150 * Time stamp option structure. 151 */ 152 struct ip_timestamp { 153 u_char ipt_code; /* IPOPT_TS */ 154 u_char ipt_len; /* size of structure (variable) */ 155 u_char ipt_ptr; /* index of current entry */ 156 #if BYTE_ORDER == LITTLE_ENDIAN 157 u_int ipt_flg:4, /* flags, see below */ 158 ipt_oflw:4; /* overflow counter */ 159 #endif 160 #if BYTE_ORDER == BIG_ENDIAN 161 u_int ipt_oflw:4, /* overflow counter */ 162 ipt_flg:4; /* flags, see below */ 163 #endif 164 union ipt_timestamp { 165 n_long ipt_time[1]; 166 struct ipt_ta { 167 struct in_addr ipt_addr; 168 n_long ipt_time; 169 } ipt_ta[1]; 170 } ipt_timestamp; 171 }; 172 173 /* flag bits for ipt_flg */ 174 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 175 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 176 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 177 178 /* bits for security (not byte swapped) */ 179 #define IPOPT_SECUR_UNCLASS 0x0000 180 #define IPOPT_SECUR_CONFID 0xf135 181 #define IPOPT_SECUR_EFTO 0x789a 182 #define IPOPT_SECUR_MMMM 0xbc4d 183 #define IPOPT_SECUR_RESTR 0xaf13 184 #define IPOPT_SECUR_SECRET 0xd788 185 #define IPOPT_SECUR_TOPSECRET 0x6bc5 186 187 /* 188 * Internet implementation parameters. 189 */ 190 #define MAXTTL 255 /* maximum time to live (seconds) */ 191 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 192 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 193 #define IPTTLDEC 1 /* subtracted when forwarding */ 194 195 #define IP_MSS 576 /* default maximum segment size */ 196 197 #endif 198