ip.h revision 1.2
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 #ifndef _NETINET_IP_H_ 37 #define _NETINET_IP_H_ 38 39 /* 40 * Definitions for internet protocol version 4. 41 * Per RFC 791, September 1981. 42 */ 43 #define IPVERSION 4 44 45 /* 46 * Structure of an internet header, naked of options. 47 * 48 * We declare ip_len and ip_off to be short, rather than u_short 49 * pragmatically since otherwise unsigned comparisons can result 50 * against negative integers quite easily, and fail in subtle ways. 51 */ 52 struct ip { 53 #if BYTE_ORDER == LITTLE_ENDIAN 54 u_char ip_hl:4, /* header length */ 55 ip_v:4; /* version */ 56 #endif 57 #if BYTE_ORDER == BIG_ENDIAN 58 u_char ip_v:4, /* version */ 59 ip_hl:4; /* header length */ 60 #endif 61 u_char ip_tos; /* type of service */ 62 short ip_len; /* total length */ 63 u_short ip_id; /* identification */ 64 short ip_off; /* fragment offset field */ 65 #define IP_DF 0x4000 /* dont fragment flag */ 66 #define IP_MF 0x2000 /* more fragments flag */ 67 u_char ip_ttl; /* time to live */ 68 u_char ip_p; /* protocol */ 69 u_short ip_sum; /* checksum */ 70 struct in_addr ip_src,ip_dst; /* source and dest address */ 71 }; 72 73 #define IP_MAXPACKET 65535 /* maximum packet size */ 74 75 /* 76 * Definitions for IP type of service (ip_tos) 77 */ 78 #define IPTOS_LOWDELAY 0x10 79 #define IPTOS_THROUGHPUT 0x08 80 #define IPTOS_RELIABILITY 0x04 81 82 /* 83 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 84 */ 85 #define IPTOS_PREC_NETCONTROL 0xe0 86 #define IPTOS_PREC_INTERNETCONTROL 0xc0 87 #define IPTOS_PREC_CRITIC_ECP 0xa0 88 #define IPTOS_PREC_FLASHOVERRIDE 0x80 89 #define IPTOS_PREC_FLASH 0x60 90 #define IPTOS_PREC_IMMEDIATE 0x40 91 #define IPTOS_PREC_PRIORITY 0x20 92 #define IPTOS_PREC_ROUTINE 0x10 93 94 /* 95 * Definitions for options. 96 */ 97 #define IPOPT_COPIED(o) ((o)&0x80) 98 #define IPOPT_CLASS(o) ((o)&0x60) 99 #define IPOPT_NUMBER(o) ((o)&0x1f) 100 101 #define IPOPT_CONTROL 0x00 102 #define IPOPT_RESERVED1 0x20 103 #define IPOPT_DEBMEAS 0x40 104 #define IPOPT_RESERVED2 0x60 105 106 #define IPOPT_EOL 0 /* end of option list */ 107 #define IPOPT_NOP 1 /* no operation */ 108 109 #define IPOPT_RR 7 /* record packet route */ 110 #define IPOPT_TS 68 /* timestamp */ 111 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 112 #define IPOPT_LSRR 131 /* loose source route */ 113 #define IPOPT_SATID 136 /* satnet id */ 114 #define IPOPT_SSRR 137 /* strict source route */ 115 116 /* 117 * Offsets to fields in options other than EOL and NOP. 118 */ 119 #define IPOPT_OPTVAL 0 /* option ID */ 120 #define IPOPT_OLEN 1 /* option length */ 121 #define IPOPT_OFFSET 2 /* offset within option */ 122 #define IPOPT_MINOFF 4 /* min value of above */ 123 124 /* 125 * Time stamp option structure. 126 */ 127 struct ip_timestamp { 128 u_char ipt_code; /* IPOPT_TS */ 129 u_char ipt_len; /* size of structure (variable) */ 130 u_char ipt_ptr; /* index of current entry */ 131 #if BYTE_ORDER == LITTLE_ENDIAN 132 u_char ipt_flg:4, /* flags, see below */ 133 ipt_oflw:4; /* overflow counter */ 134 #endif 135 #if BYTE_ORDER == BIG_ENDIAN 136 u_char ipt_oflw:4, /* overflow counter */ 137 ipt_flg:4; /* flags, see below */ 138 #endif 139 union ipt_timestamp { 140 n_long ipt_time[1]; 141 struct ipt_ta { 142 struct in_addr ipt_addr; 143 n_long ipt_time; 144 } ipt_ta[1]; 145 } ipt_timestamp; 146 }; 147 148 /* flag bits for ipt_flg */ 149 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 150 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 151 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 152 153 /* bits for security (not byte swapped) */ 154 #define IPOPT_SECUR_UNCLASS 0x0000 155 #define IPOPT_SECUR_CONFID 0xf135 156 #define IPOPT_SECUR_EFTO 0x789a 157 #define IPOPT_SECUR_MMMM 0xbc4d 158 #define IPOPT_SECUR_RESTR 0xaf13 159 #define IPOPT_SECUR_SECRET 0xd788 160 #define IPOPT_SECUR_TOPSECRET 0x6bc5 161 162 /* 163 * Internet implementation parameters. 164 */ 165 #define MAXTTL 255 /* maximum time to live (seconds) */ 166 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 167 #define IPTTLDEC 1 /* subtracted when forwarding */ 168 169 #define IP_MSS 576 /* default maximum segment size */ 170 171 #endif /* !_NETINET_IP_H_ */ 172
Indexes created Tue Sep 23 07:09:52 GMT 2025