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 1.4 2005/02/11 22:25:57 joerg 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 #elif _BYTE_ORDER == _LITTLE_ENDIAN 54 u_int ip_hl:4, /* header length */ 55 ip_v:4; /* version */ 56 #elif _BYTE_ORDER == _BIG_ENDIAN 57 u_int ip_v:4, /* version */ 58 ip_hl:4; /* header length */ 59 #else 60 #error "Byte order not implemented" 61 #endif 62 u_char ip_tos; /* type of service */ 63 u_short ip_len; /* total length */ 64 u_short ip_id; /* identification */ 65 u_short ip_off; /* fragment offset field */ 66 #define IP_RF 0x8000 /* reserved fragment flag */ 67 #define IP_DF 0x4000 /* dont fragment flag */ 68 #define IP_MF 0x2000 /* more fragments flag */ 69 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 70 u_char ip_ttl; /* time to live */ 71 u_char ip_p; /* protocol */ 72 u_short ip_sum; /* checksum */ 73 struct in_addr ip_src,ip_dst; /* source and dest address */ 74 }; 75 76 #ifdef _IP_VHL 77 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 78 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 79 #define IP_VHL_V(vhl) ((vhl) >> 4) 80 #define IP_VHL_BORING 0x45 81 #endif 82 83 #define IP_MAXPACKET 65535 /* maximum packet size */ 84 85 /* 86 * Definitions for IP type of service (ip_tos) 87 */ 88 #define IPTOS_LOWDELAY 0x10 89 #define IPTOS_THROUGHPUT 0x08 90 #define IPTOS_RELIABILITY 0x04 91 #define IPTOS_MINCOST 0x02 92 #if 1 93 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 94 #define IPTOS_CE 0x01 /* congestion experienced */ 95 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 96 #endif 97 98 99 /* 100 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 101 */ 102 #define IPTOS_PREC_NETCONTROL 0xe0 103 #define IPTOS_PREC_INTERNETCONTROL 0xc0 104 #define IPTOS_PREC_CRITIC_ECP 0xa0 105 #define IPTOS_PREC_FLASHOVERRIDE 0x80 106 #define IPTOS_PREC_FLASH 0x60 107 #define IPTOS_PREC_IMMEDIATE 0x40 108 #define IPTOS_PREC_PRIORITY 0x20 109 #define IPTOS_PREC_ROUTINE 0x00 110 111 /* 112 * ECN (Explicit Congestion Notification) codepoints in RFC3168 113 * mapped to the lower 2 bits of the TOS field. 114 */ 115 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 116 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 117 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 118 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 119 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 120 121 /* 122 * Definitions for options. 123 */ 124 #define IPOPT_COPIED(o) ((o)&0x80) 125 #define IPOPT_CLASS(o) ((o)&0x60) 126 #define IPOPT_NUMBER(o) ((o)&0x1f) 127 128 #define IPOPT_CONTROL 0x00 129 #define IPOPT_RESERVED1 0x20 130 #define IPOPT_DEBMEAS 0x40 131 #define IPOPT_RESERVED2 0x60 132 133 #define IPOPT_EOL 0 /* end of option list */ 134 #define IPOPT_NOP 1 /* no operation */ 135 136 #define IPOPT_RR 7 /* record packet route */ 137 #define IPOPT_TS 68 /* timestamp */ 138 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 139 #define IPOPT_LSRR 131 /* loose source route */ 140 #define IPOPT_SATID 136 /* satnet id */ 141 #define IPOPT_SSRR 137 /* strict source route */ 142 #define IPOPT_RA 148 /* router alert */ 143 144 /* 145 * Offsets to fields in options other than EOL and NOP. 146 */ 147 #define IPOPT_OPTVAL 0 /* option ID */ 148 #define IPOPT_OLEN 1 /* option length */ 149 #define IPOPT_OFFSET 2 /* offset within option */ 150 #define IPOPT_MINOFF 4 /* min value of above */ 151 152 /* 153 * Time stamp option structure. 154 */ 155 struct ip_timestamp { 156 u_char ipt_code; /* IPOPT_TS */ 157 u_char ipt_len; /* size of structure (variable) */ 158 u_char ipt_ptr; /* index of current entry */ 159 #if _BYTE_ORDER == _LITTLE_ENDIAN 160 u_int ipt_flg:4, /* flags, see below */ 161 ipt_oflw:4; /* overflow counter */ 162 #elif _BYTE_ORDER == _BIG_ENDIAN 163 u_int ipt_oflw:4, /* overflow counter */ 164 ipt_flg:4; /* flags, see below */ 165 #else 166 #error "Byte order not implemented" 167 #endif 168 union ipt_timestamp { 169 n_long ipt_time[1]; 170 struct ipt_ta { 171 struct in_addr ipt_addr; 172 n_long ipt_time; 173 } ipt_ta[1]; 174 } ipt_timestamp; 175 }; 176 177 /* flag bits for ipt_flg */ 178 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 179 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 180 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 181 182 /* bits for security (not byte swapped) */ 183 #define IPOPT_SECUR_UNCLASS 0x0000 184 #define IPOPT_SECUR_CONFID 0xf135 185 #define IPOPT_SECUR_EFTO 0x789a 186 #define IPOPT_SECUR_MMMM 0xbc4d 187 #define IPOPT_SECUR_RESTR 0xaf13 188 #define IPOPT_SECUR_SECRET 0xd788 189 #define IPOPT_SECUR_TOPSECRET 0x6bc5 190 191 /* 192 * Internet implementation parameters. 193 */ 194 #define MAXTTL 255 /* maximum time to live (seconds) */ 195 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 196 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 197 #define IPTTLDEC 1 /* subtracted when forwarding */ 198 199 #define IP_MSS 576 /* default maximum segment size */ 200 201 #endif 202