ip.h revision 1.1
1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * 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 7.10 (Berkeley) 6/28/90 34 */ 35 36 /* 37 * Definitions for internet protocol version 4. 38 * Per RFC 791, September 1981. 39 */ 40 #define IPVERSION 4 41 42 /* 43 * Structure of an internet header, naked of options. 44 * 45 * We declare ip_len and ip_off to be short, rather than u_short 46 * pragmatically since otherwise unsigned comparisons can result 47 * against negative integers quite easily, and fail in subtle ways. 48 */ 49 struct ip { 50 #if BYTE_ORDER == LITTLE_ENDIAN 51 u_char ip_hl:4, /* header length */ 52 ip_v:4; /* version */ 53 #endif 54 #if BYTE_ORDER == BIG_ENDIAN 55 u_char ip_v:4, /* version */ 56 ip_hl:4; /* header length */ 57 #endif 58 u_char ip_tos; /* type of service */ 59 short ip_len; /* total length */ 60 u_short ip_id; /* identification */ 61 short ip_off; /* fragment offset field */ 62 #define IP_DF 0x4000 /* dont fragment flag */ 63 #define IP_MF 0x2000 /* more fragments flag */ 64 u_char ip_ttl; /* time to live */ 65 u_char ip_p; /* protocol */ 66 u_short ip_sum; /* checksum */ 67 struct in_addr ip_src,ip_dst; /* source and dest address */ 68 }; 69 70 #define IP_MAXPACKET 65535 /* maximum packet size */ 71 72 /* 73 * Definitions for IP type of service (ip_tos) 74 */ 75 #define IPTOS_LOWDELAY 0x10 76 #define IPTOS_THROUGHPUT 0x08 77 #define IPTOS_RELIABILITY 0x04 78 79 /* 80 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 81 */ 82 #define IPTOS_PREC_NETCONTROL 0xe0 83 #define IPTOS_PREC_INTERNETCONTROL 0xc0 84 #define IPTOS_PREC_CRITIC_ECP 0xa0 85 #define IPTOS_PREC_FLASHOVERRIDE 0x80 86 #define IPTOS_PREC_FLASH 0x60 87 #define IPTOS_PREC_IMMEDIATE 0x40 88 #define IPTOS_PREC_PRIORITY 0x20 89 #define IPTOS_PREC_ROUTINE 0x10 90 91 /* 92 * Definitions for options. 93 */ 94 #define IPOPT_COPIED(o) ((o)&0x80) 95 #define IPOPT_CLASS(o) ((o)&0x60) 96 #define IPOPT_NUMBER(o) ((o)&0x1f) 97 98 #define IPOPT_CONTROL 0x00 99 #define IPOPT_RESERVED1 0x20 100 #define IPOPT_DEBMEAS 0x40 101 #define IPOPT_RESERVED2 0x60 102 103 #define IPOPT_EOL 0 /* end of option list */ 104 #define IPOPT_NOP 1 /* no operation */ 105 106 #define IPOPT_RR 7 /* record packet route */ 107 #define IPOPT_TS 68 /* timestamp */ 108 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 109 #define IPOPT_LSRR 131 /* loose source route */ 110 #define IPOPT_SATID 136 /* satnet id */ 111 #define IPOPT_SSRR 137 /* strict source route */ 112 113 /* 114 * Offsets to fields in options other than EOL and NOP. 115 */ 116 #define IPOPT_OPTVAL 0 /* option ID */ 117 #define IPOPT_OLEN 1 /* option length */ 118 #define IPOPT_OFFSET 2 /* offset within option */ 119 #define IPOPT_MINOFF 4 /* min value of above */ 120 121 /* 122 * Time stamp option structure. 123 */ 124 struct ip_timestamp { 125 u_char ipt_code; /* IPOPT_TS */ 126 u_char ipt_len; /* size of structure (variable) */ 127 u_char ipt_ptr; /* index of current entry */ 128 #if BYTE_ORDER == LITTLE_ENDIAN 129 u_char ipt_flg:4, /* flags, see below */ 130 ipt_oflw:4; /* overflow counter */ 131 #endif 132 #if BYTE_ORDER == BIG_ENDIAN 133 u_char ipt_oflw:4, /* overflow counter */ 134 ipt_flg:4; /* flags, see below */ 135 #endif 136 union ipt_timestamp { 137 n_long ipt_time[1]; 138 struct ipt_ta { 139 struct in_addr ipt_addr; 140 n_long ipt_time; 141 } ipt_ta[1]; 142 } ipt_timestamp; 143 }; 144 145 /* flag bits for ipt_flg */ 146 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 147 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 148 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 149 150 /* bits for security (not byte swapped) */ 151 #define IPOPT_SECUR_UNCLASS 0x0000 152 #define IPOPT_SECUR_CONFID 0xf135 153 #define IPOPT_SECUR_EFTO 0x789a 154 #define IPOPT_SECUR_MMMM 0xbc4d 155 #define IPOPT_SECUR_RESTR 0xaf13 156 #define IPOPT_SECUR_SECRET 0xd788 157 #define IPOPT_SECUR_TOPSECRET 0x6bc5 158 159 /* 160 * Internet implementation parameters. 161 */ 162 #define MAXTTL 255 /* maximum time to live (seconds) */ 163 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 164 #define IPTTLDEC 1 /* subtracted when forwarding */ 165 166 #define IP_MSS 576 /* default maximum segment size */ 167
Indexes created Thu Sep 25 02:09:54 GMT 2025