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 * $Id: ip.h,v 1.6 1995/09/21 18:01:11 wollman Exp $ 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 * 49 * We declare ip_len and ip_off to be short, rather than u_short 50 * pragmatically since otherwise unsigned comparisons can result 51 * against negative integers quite easily, and fail in subtle ways. 52 */ 53 struct ip { 54 #ifdef _IP_VHL 55 u_char ip_vhl; /* version << 4 | header length >> 2 */ 56 #else 57 #if BYTE_ORDER == LITTLE_ENDIAN 58 u_char ip_hl:4, /* header length */ 59 ip_v:4; /* version */ 60 #endif 61 #if BYTE_ORDER == BIG_ENDIAN 62 u_char ip_v:4, /* version */ 63 ip_hl:4; /* header length */ 64 #endif 65 #endif /* not _IP_VHL */ 66 u_char ip_tos; /* type of service */ 67 short ip_len; /* total length */ 68 u_short ip_id; /* identification */ 69 short ip_off; /* fragment offset field */ 70 #define IP_DF 0x4000 /* dont fragment flag */ 71 #define IP_MF 0x2000 /* more fragments flag */ 72 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 73 u_char ip_ttl; /* time to live */ 74 u_char ip_p; /* protocol */ 75 u_short ip_sum; /* checksum */ 76 struct in_addr ip_src,ip_dst; /* source and dest address */ 77 }; 78 79 #define IP_MAXPACKET 65535 /* maximum packet size */ 80 81 /* 82 * Definitions for IP type of service (ip_tos) 83 */ 84 #define IPTOS_LOWDELAY 0x10 85 #define IPTOS_THROUGHPUT 0x08 86 #define IPTOS_RELIABILITY 0x04 87 #define IPTOS_MINCOST 0x02 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 */ 134 struct 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 */ 178 179 #endif 180