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 1.5 2006/05/20 02:42:12 dillon Exp $ 36 */ 37 38 #ifndef _NETINET_IP_H_ 39 #define _NETINET_IP_H_ 40 41 #ifndef _SYS_TYPES_H_ 42 #include <sys/types.h> 43 #endif 44 #ifndef _NETINET_IN_H_ 45 #include <netinet/in.h> 46 #endif 47 #ifndef _NETINET_IN_SYSTM_H_ 48 #include <netinet/in_systm.h> 49 #endif 50 #ifndef _MACHINE_ENDIAN_H_ 51 #include <machine/endian.h> 52 #endif 53 54 /* 55 * Definitions for internet protocol version 4. 56 * Per RFC 791, September 1981. 57 */ 58 #define IPVERSION 4 59 60 /* 61 * Structure of an internet header, naked of options. 62 */ 63 struct ip { 64 #ifdef _IP_VHL 65 u_char ip_vhl; /* version << 4 | header length >> 2 */ 66 #elif _BYTE_ORDER == _LITTLE_ENDIAN 67 u_int ip_hl:4, /* header length */ 68 ip_v:4; /* version */ 69 #elif _BYTE_ORDER == _BIG_ENDIAN 70 u_int ip_v:4, /* version */ 71 ip_hl:4; /* header length */ 72 #else 73 #error "Byte order not implemented" 74 #endif 75 u_char ip_tos; /* type of service */ 76 u_short ip_len; /* total length */ 77 u_short ip_id; /* identification */ 78 u_short ip_off; /* fragment offset field */ 79 #define IP_RF 0x8000 /* reserved fragment flag */ 80 #define IP_DF 0x4000 /* dont fragment flag */ 81 #define IP_MF 0x2000 /* more fragments flag */ 82 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 83 u_char ip_ttl; /* time to live */ 84 u_char ip_p; /* protocol */ 85 u_short ip_sum; /* checksum */ 86 struct in_addr ip_src,ip_dst; /* source and dest address */ 87 }; 88 89 #ifdef _IP_VHL 90 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl)) 91 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 92 #define IP_VHL_V(vhl) ((vhl) >> 4) 93 #define IP_VHL_BORING 0x45 94 #endif 95 96 #define IP_MAXPACKET 65535 /* maximum packet size */ 97 98 /* 99 * Definitions for IP type of service (ip_tos) 100 */ 101 #define IPTOS_LOWDELAY 0x10 102 #define IPTOS_THROUGHPUT 0x08 103 #define IPTOS_RELIABILITY 0x04 104 #define IPTOS_MINCOST 0x02 105 #if 1 106 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 107 #define IPTOS_CE 0x01 /* congestion experienced */ 108 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 109 #endif 110 111 112 /* 113 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 114 */ 115 #define IPTOS_PREC_NETCONTROL 0xe0 116 #define IPTOS_PREC_INTERNETCONTROL 0xc0 117 #define IPTOS_PREC_CRITIC_ECP 0xa0 118 #define IPTOS_PREC_FLASHOVERRIDE 0x80 119 #define IPTOS_PREC_FLASH 0x60 120 #define IPTOS_PREC_IMMEDIATE 0x40 121 #define IPTOS_PREC_PRIORITY 0x20 122 #define IPTOS_PREC_ROUTINE 0x00 123 124 /* 125 * ECN (Explicit Congestion Notification) codepoints in RFC3168 126 * mapped to the lower 2 bits of the TOS field. 127 */ 128 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 129 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 130 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 131 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 132 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 133 134 /* 135 * Definitions for options. 136 */ 137 #define IPOPT_COPIED(o) ((o)&0x80) 138 #define IPOPT_CLASS(o) ((o)&0x60) 139 #define IPOPT_NUMBER(o) ((o)&0x1f) 140 141 #define IPOPT_CONTROL 0x00 142 #define IPOPT_RESERVED1 0x20 143 #define IPOPT_DEBMEAS 0x40 144 #define IPOPT_RESERVED2 0x60 145 146 #define IPOPT_EOL 0 /* end of option list */ 147 #define IPOPT_NOP 1 /* no operation */ 148 149 #define IPOPT_RR 7 /* record packet route */ 150 #define IPOPT_TS 68 /* timestamp */ 151 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 152 #define IPOPT_LSRR 131 /* loose source route */ 153 #define IPOPT_SATID 136 /* satnet id */ 154 #define IPOPT_SSRR 137 /* strict source route */ 155 #define IPOPT_RA 148 /* router alert */ 156 157 /* 158 * Offsets to fields in options other than EOL and NOP. 159 */ 160 #define IPOPT_OPTVAL 0 /* option ID */ 161 #define IPOPT_OLEN 1 /* option length */ 162 #define IPOPT_OFFSET 2 /* offset within option */ 163 #define IPOPT_MINOFF 4 /* min value of above */ 164 165 /* 166 * Time stamp option structure. 167 */ 168 struct ip_timestamp { 169 u_char ipt_code; /* IPOPT_TS */ 170 u_char ipt_len; /* size of structure (variable) */ 171 u_char ipt_ptr; /* index of current entry */ 172 #if _BYTE_ORDER == _LITTLE_ENDIAN 173 u_int ipt_flg:4, /* flags, see below */ 174 ipt_oflw:4; /* overflow counter */ 175 #elif _BYTE_ORDER == _BIG_ENDIAN 176 u_int ipt_oflw:4, /* overflow counter */ 177 ipt_flg:4; /* flags, see below */ 178 #else 179 #error "Byte order not implemented" 180 #endif 181 union ipt_timestamp { 182 n_long ipt_time[1]; 183 struct ipt_ta { 184 struct in_addr ipt_addr; 185 n_long ipt_time; 186 } ipt_ta[1]; 187 } ipt_timestamp; 188 }; 189 190 /* flag bits for ipt_flg */ 191 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 192 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 193 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 194 195 /* bits for security (not byte swapped) */ 196 #define IPOPT_SECUR_UNCLASS 0x0000 197 #define IPOPT_SECUR_CONFID 0xf135 198 #define IPOPT_SECUR_EFTO 0x789a 199 #define IPOPT_SECUR_MMMM 0xbc4d 200 #define IPOPT_SECUR_RESTR 0xaf13 201 #define IPOPT_SECUR_SECRET 0xd788 202 #define IPOPT_SECUR_TOPSECRET 0x6bc5 203 204 /* 205 * Internet implementation parameters. 206 */ 207 #define MAXTTL 255 /* maximum time to live (seconds) */ 208 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 209 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 210 #define IPTTLDEC 1 /* subtracted when forwarding */ 211 212 #define IP_MSS 576 /* default maximum segment size */ 213 214 #endif 215