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 */ 35 #ifndef WIN32 36 #include <endian.h> 37 #else 38 #include <winsock2.h> 39 #ifndef LITTLE_ENDIAN 40 #define LITTLE_ENDIAN 1234 41 #define BIG_ENDIAN 4321 42 #define BYTE_ORDER LITTLE_ENDIAN 43 #endif 44 #endif 45 46 /* 47 * Definitions for internet protocol version 4. 48 * Per RFC 791, September 1981. 49 */ 50 #define IPVERSION 4 51 52 /* 53 * Structure of an internet header, naked of options. 54 * 55 * We declare ip_len and ip_off to be short, rather than u_short 56 * pragmatically since otherwise unsigned comparisons can result 57 * against negative integers quite easily, and fail in subtle ways. 58 */ 59 struct ip { 60 #if BYTE_ORDER == LITTLE_ENDIAN 61 u_char ip_hl:4, /* header length */ 62 ip_v:4; /* version */ 63 #endif 64 #if BYTE_ORDER == BIG_ENDIAN 65 u_char ip_v:4, /* version */ 66 ip_hl:4; /* header length */ 67 #endif 68 u_char ip_tos; /* type of service */ 69 short ip_len; /* total length */ 70 u_short ip_id; /* identification */ 71 short ip_off; /* fragment offset field */ 72 #define IP_DF 0x4000 /* dont fragment flag */ 73 #define IP_MF 0x2000 /* more fragments flag */ 74 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 75 u_char ip_ttl; /* time to live */ 76 u_char ip_p; /* protocol */ 77 u_short ip_sum; /* checksum */ 78 struct in_addr ip_src,ip_dst; /* source and dest address */ 79 }; 80 81 #define IP_MAXPACKET 65535 /* maximum packet size */ 82 83 /* 84 * Definitions for IP type of service (ip_tos) 85 */ 86 #define IPTOS_LOWDELAY 0x10 87 #define IPTOS_THROUGHPUT 0x08 88 #define IPTOS_RELIABILITY 0x04 89 90 /* 91 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 92 */ 93 #define IPTOS_PREC_NETCONTROL 0xe0 94 #define IPTOS_PREC_INTERNETCONTROL 0xc0 95 #define IPTOS_PREC_CRITIC_ECP 0xa0 96 #define IPTOS_PREC_FLASHOVERRIDE 0x80 97 #define IPTOS_PREC_FLASH 0x60 98 #define IPTOS_PREC_IMMEDIATE 0x40 99 #define IPTOS_PREC_PRIORITY 0x20 100 #define IPTOS_PREC_ROUTINE 0x00 101 102 /* 103 * Definitions for options. 104 */ 105 #define IPOPT_COPIED(o) ((o)&0x80) 106 #define IPOPT_CLASS(o) ((o)&0x60) 107 #define IPOPT_NUMBER(o) ((o)&0x1f) 108 109 #define IPOPT_CONTROL 0x00 110 #define IPOPT_RESERVED1 0x20 111 #define IPOPT_DEBMEAS 0x40 112 #define IPOPT_RESERVED2 0x60 113 114 #define IPOPT_EOL 0 /* end of option list */ 115 #define IPOPT_NOP 1 /* no operation */ 116 117 #define IPOPT_RR 7 /* record packet route */ 118 #define IPOPT_TS 68 /* timestamp */ 119 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 120 #define IPOPT_LSRR 131 /* loose source route */ 121 #define IPOPT_SATID 136 /* satnet id */ 122 #define IPOPT_SSRR 137 /* strict source route */ 123 124 /* 125 * Offsets to fields in options other than EOL and NOP. 126 */ 127 #define IPOPT_OPTVAL 0 /* option ID */ 128 #define IPOPT_OLEN 1 /* option length */ 129 #define IPOPT_OFFSET 2 /* offset within option */ 130 #define IPOPT_MINOFF 4 /* min value of above */ 131 132 /* 133 * Time stamp option structure. 134 */ 135 struct ip_timestamp { 136 u_char ipt_code; /* IPOPT_TS */ 137 u_char ipt_len; /* size of structure (variable) */ 138 u_char ipt_ptr; /* index of current entry */ 139 #if BYTE_ORDER == LITTLE_ENDIAN 140 u_char ipt_flg:4, /* flags, see below */ 141 ipt_oflw:4; /* overflow counter */ 142 #endif 143 #if BYTE_ORDER == BIG_ENDIAN 144 u_char ipt_oflw:4, /* overflow counter */ 145 ipt_flg:4; /* flags, see below */ 146 #endif 147 union ipt_timestamp { 148 n_long ipt_time[1]; 149 struct ipt_ta { 150 struct in_addr ipt_addr; 151 n_long ipt_time; 152 } ipt_ta[1]; 153 } ipt_timestamp; 154 }; 155 156 /* flag bits for ipt_flg */ 157 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 158 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 159 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 160 161 /* bits for security (not byte swapped) */ 162 #define IPOPT_SECUR_UNCLASS 0x0000 163 #define IPOPT_SECUR_CONFID 0xf135 164 #define IPOPT_SECUR_EFTO 0x789a 165 #define IPOPT_SECUR_MMMM 0xbc4d 166 #define IPOPT_SECUR_RESTR 0xaf13 167 #define IPOPT_SECUR_SECRET 0xd788 168 #define IPOPT_SECUR_TOPSECRET 0x6bc5 169 170 /* 171 * Internet implementation parameters. 172 */ 173 #define MAXTTL 255 /* maximum time to live (seconds) */ 174 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 175 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 176 #define IPTTLDEC 1 /* subtracted when forwarding */ 177 178 #define IP_MSS 576 /* default maximum segment size */ 179