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 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $ 35 * $DragonFly: src/sys/netinet/ip.h,v 1.2 2003/06/17 04:28:51 dillon Exp $ 36 */ 37 38 #ifndef _NETINET_IP_H_ 39 #define _NETINET_IP_H_ 40 41 /* 42 * Definitions for internet protocol version 4. 43 * Per RFC 791, September 1981. 44 */ 45 #define IPVERSION 4 46 47 /* 48 * Structure of an internet header, naked of options. 49 */ 50 struct ip { 51 #ifdef _IP_VHL 52 u_char ip_vhl; /* version << 4 | header length >> 2 */ 53 #else 54 #if BYTE_ORDER == LITTLE_ENDIAN 55 u_int ip_hl:4, /* header length */ 56 ip_v:4; /* version */ 57 #endif 58 #if BYTE_ORDER == BIG_ENDIAN 59 u_int ip_v:4, /* version */ 60 ip_hl:4; /* header length */ 61 #endif 62 #endif /* not _IP_VHL */ 63 u_char ip_tos; /* type of service */ 64 u_short ip_len; /* total length */ 65 u_short ip_id; /* identification */ 66 u_short ip_off; /* fragment offset field */ 67 #define IP_RF 0x8000 /* reserved fragment flag */ 68 #define IP_DF 0x4000 /* dont fragment flag */ 69 #define IP_MF 0x2000 /* more fragments flag */ 70 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 71 u_char ip_ttl; /* time to live */ 72 u_char ip_p; /* protocol */ 73 u_short ip_sum; /* checksum */ 74 struct in_addr ip_src,ip_dst; /* source and dest address */ 75 }; 76 77 #ifdef _IP_VHL 78 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 79 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 80 #define IP_VHL_V(vhl) ((vhl) >> 4) 81 #define IP_VHL_BORING 0x45 82 #endif 83 84 #define IP_MAXPACKET 65535 /* maximum packet size */ 85 86 /* 87 * Definitions for IP type of service (ip_tos) 88 */ 89 #define IPTOS_LOWDELAY 0x10 90 #define IPTOS_THROUGHPUT 0x08 91 #define IPTOS_RELIABILITY 0x04 92 #define IPTOS_MINCOST 0x02 93 /* ECN bits proposed by Sally Floyd */ 94 #define IPTOS_CE 0x01 /* congestion experienced */ 95 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 96 97 98 /* 99 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 100 */ 101 #define IPTOS_PREC_NETCONTROL 0xe0 102 #define IPTOS_PREC_INTERNETCONTROL 0xc0 103 #define IPTOS_PREC_CRITIC_ECP 0xa0 104 #define IPTOS_PREC_FLASHOVERRIDE 0x80 105 #define IPTOS_PREC_FLASH 0x60 106 #define IPTOS_PREC_IMMEDIATE 0x40 107 #define IPTOS_PREC_PRIORITY 0x20 108 #define IPTOS_PREC_ROUTINE 0x00 109 110 /* 111 * Definitions for options. 112 */ 113 #define IPOPT_COPIED(o) ((o)&0x80) 114 #define IPOPT_CLASS(o) ((o)&0x60) 115 #define IPOPT_NUMBER(o) ((o)&0x1f) 116 117 #define IPOPT_CONTROL 0x00 118 #define IPOPT_RESERVED1 0x20 119 #define IPOPT_DEBMEAS 0x40 120 #define IPOPT_RESERVED2 0x60 121 122 #define IPOPT_EOL 0 /* end of option list */ 123 #define IPOPT_NOP 1 /* no operation */ 124 125 #define IPOPT_RR 7 /* record packet route */ 126 #define IPOPT_TS 68 /* timestamp */ 127 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 128 #define IPOPT_LSRR 131 /* loose source route */ 129 #define IPOPT_SATID 136 /* satnet id */ 130 #define IPOPT_SSRR 137 /* strict source route */ 131 #define IPOPT_RA 148 /* router alert */ 132 133 /* 134 * Offsets to fields in options other than EOL and NOP. 135 */ 136 #define IPOPT_OPTVAL 0 /* option ID */ 137 #define IPOPT_OLEN 1 /* option length */ 138 #define IPOPT_OFFSET 2 /* offset within option */ 139 #define IPOPT_MINOFF 4 /* min value of above */ 140 141 /* 142 * Time stamp option structure. 143 */ 144 struct ip_timestamp { 145 u_char ipt_code; /* IPOPT_TS */ 146 u_char ipt_len; /* size of structure (variable) */ 147 u_char ipt_ptr; /* index of current entry */ 148 #if BYTE_ORDER == LITTLE_ENDIAN 149 u_int ipt_flg:4, /* flags, see below */ 150 ipt_oflw:4; /* overflow counter */ 151 #endif 152 #if BYTE_ORDER == BIG_ENDIAN 153 u_int ipt_oflw:4, /* overflow counter */ 154 ipt_flg:4; /* flags, see below */ 155 #endif 156 union ipt_timestamp { 157 n_long ipt_time[1]; 158 struct ipt_ta { 159 struct in_addr ipt_addr; 160 n_long ipt_time; 161 } ipt_ta[1]; 162 } ipt_timestamp; 163 }; 164 165 /* flag bits for ipt_flg */ 166 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 167 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 168 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 169 170 /* bits for security (not byte swapped) */ 171 #define IPOPT_SECUR_UNCLASS 0x0000 172 #define IPOPT_SECUR_CONFID 0xf135 173 #define IPOPT_SECUR_EFTO 0x789a 174 #define IPOPT_SECUR_MMMM 0xbc4d 175 #define IPOPT_SECUR_RESTR 0xaf13 176 #define IPOPT_SECUR_SECRET 0xd788 177 #define IPOPT_SECUR_TOPSECRET 0x6bc5 178 179 /* 180 * Internet implementation parameters. 181 */ 182 #define MAXTTL 255 /* maximum time to live (seconds) */ 183 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 184 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 185 #define IPTTLDEC 1 /* subtracted when forwarding */ 186 187 #define IP_MSS 576 /* default maximum segment size */ 188 189 #endif 190