00001 /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */ 00002 00003 /* 00004 * Copyright (c) 1982, 1986, 1993 00005 * The Regents of the University of California. All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions 00009 * are met: 00010 * 1. Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 2. Redistributions in binary form must reproduce the above copyright 00013 * notice, this list of conditions and the following disclaimer in the 00014 * documentation and/or other materials provided with the distribution. 00015 * 3. Neither the name of the University nor the names of its contributors 00016 * may be used to endorse or promote products derived from this software 00017 * without specific prior written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00021 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00022 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00023 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00024 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00025 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00026 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00027 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00028 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00029 * SUCH DAMAGE. 00030 * 00031 * @(#)ip.h 8.1 (Berkeley) 6/10/93 00032 */ 00033 00034 /* 00035 * Definitions for internet protocol version 4. 00036 * Per RFC 791, September 1981. 00037 */ 00038 #define IPVERSION 4 00039 00040 /* 00041 * Structure of an internet header, naked of options. 00042 * 00043 * We declare ip_len and ip_off to be short, rather than u_short 00044 * pragmatically since otherwise unsigned comparisons can result 00045 * against negative integers quite easily, and fail in subtle ways. 00046 */ 00047 struct ip { 00048 u_int8_t ip_fvhl; /* header length, version */ 00049 u_int8_t ip_tos; /* type of service */ 00050 int16_t ip_len; /* total length */ 00051 u_int16_t ip_id; /* identification */ 00052 int16_t ip_off; /* fragment offset field */ 00053 #define IP_DF 0x4000 /* dont fragment flag */ 00054 #define IP_MF 0x2000 /* more fragments flag */ 00055 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 00056 u_int8_t ip_ttl; /* time to live */ 00057 u_int8_t ip_p; /* protocol */ 00058 u_int16_t ip_sum; /* checksum */ 00059 struct in_addr ip_src, ip_dst; /* source and dest address */ 00060 }; 00061 00062 #define IP_V(iph) ((iph)->ip_fvhl >> 4) 00063 #define IP_HL(iph) (((iph)->ip_fvhl & 0x0F) << 2) 00064 #define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4)) 00065 #define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \ 00066 ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F)) 00067 00068 #define IP_MAXPACKET 65535 /* maximum packet size */ 00069 00070 /* 00071 * Definitions for IP type of service (ip_tos) 00072 */ 00073 #define IPTOS_LOWDELAY 0x10 00074 #define IPTOS_THROUGHPUT 0x08 00075 #define IPTOS_RELIABILITY 0x04 00076 /* IPTOS_LOWCOST 0x02 XXX */ 00077 00078 /* 00079 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 00080 */ 00081 #define IPTOS_PREC_NETCONTROL 0xe0 00082 #define IPTOS_PREC_INTERNETCONTROL 0xc0 00083 #define IPTOS_PREC_CRITIC_ECP 0xa0 00084 #define IPTOS_PREC_FLASHOVERRIDE 0x80 00085 #define IPTOS_PREC_FLASH 0x60 00086 #define IPTOS_PREC_IMMEDIATE 0x40 00087 #define IPTOS_PREC_PRIORITY 0x20 00088 #define IPTOS_PREC_ROUTINE 0x00 00089 00090 /* 00091 * Definitions for options. 00092 */ 00093 #define IPOPT_COPIED(o) ((o)&0x80) 00094 #define IPOPT_CLASS(o) ((o)&0x60) 00095 #define IPOPT_NUMBER(o) ((o)&0x1f) 00096 00097 #define IPOPT_CONTROL 0x00 00098 #define IPOPT_RESERVED1 0x20 00099 #define IPOPT_DEBMEAS 0x40 00100 #define IPOPT_RESERVED2 0x60 00101 00102 #define IPOPT_EOL 0 /* end of option list */ 00103 #define IPOPT_NOP 1 /* no operation */ 00104 00105 #define IPOPT_RR 7 /* record packet route */ 00106 #define IPOPT_TS 68 /* timestamp */ 00107 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 00108 #define IPOPT_LSRR 131 /* loose source route */ 00109 #define IPOPT_SATID 136 /* satnet id */ 00110 #define IPOPT_SSRR 137 /* strict source route */ 00111 00112 /* 00113 * Offsets to fields in options other than EOL and NOP. 00114 */ 00115 #define IPOPT_OPTVAL 0 /* option ID */ 00116 #define IPOPT_OLEN 1 /* option length */ 00117 #define IPOPT_OFFSET 2 /* offset within option */ 00118 #define IPOPT_MINOFF 4 /* min value of above */ 00119 00120 /* 00121 * Time stamp option structure. 00122 */ 00123 struct ip_timestamp { 00124 u_int8_t ipt_code; /* IPOPT_TS */ 00125 u_int8_t ipt_len; /* size of structure (variable) */ 00126 u_int8_t ipt_ptr; /* index of current entry */ 00127 u_int8_t ipt_flg_oflw; /* flags, see below, overflow counter */ 00128 union ipt_timestamp { 00129 u_int32_t ipt_time[1]; 00130 struct ipt_ta { 00131 struct in_addr ipt_addr; 00132 u_int32_t ipt_time; 00133 } ipt_ta[1]; 00134 } ipt_timestamp; 00135 }; 00136 00137 /* flag bits for ipt_flg */ 00138 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 00139 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 00140 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 00141 00142 /* bits for security (not byte swapped) */ 00143 #define IPOPT_SECUR_UNCLASS 0x0000 00144 #define IPOPT_SECUR_CONFID 0xf135 00145 #define IPOPT_SECUR_EFTO 0x789a 00146 #define IPOPT_SECUR_MMMM 0xbc4d 00147 #define IPOPT_SECUR_RESTR 0xaf13 00148 #define IPOPT_SECUR_SECRET 0xd788 00149 #define IPOPT_SECUR_TOPSECRET 0x6bc5 00150 00151 /* 00152 * Internet implementation parameters. 00153 */ 00154 #define MAXTTL 255 /* maximum time to live (seconds) */ 00155 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 00156 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 00157 #define IPTTLDEC 1 /* subtracted when forwarding */ 00158 00159 #define IP_MSS 576 /* default maximum segment size */