1 /* $OpenBSD: ip.h,v 1.20 2021/12/14 23:47:36 dtucker Exp $ */ 2 /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ip.h 8.1 (Berkeley) 6/10/93 33 */ 34 35 #ifndef _NETINET_IP_H_ 36 #define _NETINET_IP_H_ 37 38 /* 39 * Definitions for internet protocol version 4. 40 * Per RFC 791, September 1981. 41 */ 42 #define IPVERSION 4 43 44 /* 45 * Structure of an internet header, naked of options. 46 */ 47 struct ip { 48 #if _BYTE_ORDER == _LITTLE_ENDIAN 49 u_int ip_hl:4, /* header length */ 50 ip_v:4; /* version */ 51 #endif 52 #if _BYTE_ORDER == _BIG_ENDIAN 53 u_int ip_v:4, /* version */ 54 ip_hl:4; /* header length */ 55 #endif 56 u_int8_t ip_tos; /* type of service */ 57 u_int16_t ip_len; /* total length */ 58 u_int16_t ip_id; /* identification */ 59 u_int16_t ip_off; /* fragment offset field */ 60 #define IP_RF 0x8000 /* reserved fragment flag */ 61 #define IP_DF 0x4000 /* dont fragment flag */ 62 #define IP_MF 0x2000 /* more fragments flag */ 63 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 64 u_int8_t ip_ttl; /* time to live */ 65 u_int8_t ip_p; /* protocol */ 66 u_int16_t ip_sum; /* checksum */ 67 struct in_addr ip_src, ip_dst; /* source and dest address */ 68 }; 69 70 #define IP_MAXPACKET 65535 /* maximum packet size */ 71 72 /* 73 * Definitions for IP type of service (ip_tos) 74 */ 75 #define IPTOS_LOWDELAY 0x10 76 #define IPTOS_THROUGHPUT 0x08 77 #define IPTOS_RELIABILITY 0x04 78 /* IPTOS_LOWCOST 0x02 XXX */ 79 #if 1 80 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 81 #define IPTOS_CE 0x01 /* congestion experienced */ 82 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 83 #endif 84 85 /* 86 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 87 */ 88 #define IPTOS_PREC_NETCONTROL 0xe0 89 #define IPTOS_PREC_INTERNETCONTROL 0xc0 90 #define IPTOS_PREC_CRITIC_ECP 0xa0 91 #define IPTOS_PREC_FLASHOVERRIDE 0x80 92 #define IPTOS_PREC_FLASH 0x60 93 #define IPTOS_PREC_IMMEDIATE 0x40 94 #define IPTOS_PREC_PRIORITY 0x20 95 #define IPTOS_PREC_ROUTINE 0x00 96 97 /* 98 * Definitions for DiffServ Codepoints as per RFCs 2474, 3246, 4594 & 8622. 99 * These are the 6 most significant bits as they appear on the wire, so the 100 * two least significant bits must be zero. 101 */ 102 #define IPTOS_DSCP_CS0 0x00 103 #define IPTOS_DSCP_LE 0x04 104 #define IPTOS_DSCP_CS1 0x20 105 #define IPTOS_DSCP_AF11 0x28 106 #define IPTOS_DSCP_AF12 0x30 107 #define IPTOS_DSCP_AF13 0x38 108 #define IPTOS_DSCP_CS2 0x40 109 #define IPTOS_DSCP_AF21 0x48 110 #define IPTOS_DSCP_AF22 0x50 111 #define IPTOS_DSCP_AF23 0x58 112 #define IPTOS_DSCP_CS3 0x60 113 #define IPTOS_DSCP_AF31 0x68 114 #define IPTOS_DSCP_AF32 0x70 115 #define IPTOS_DSCP_AF33 0x78 116 #define IPTOS_DSCP_CS4 0x80 117 #define IPTOS_DSCP_AF41 0x88 118 #define IPTOS_DSCP_AF42 0x90 119 #define IPTOS_DSCP_AF43 0x98 120 #define IPTOS_DSCP_CS5 0xa0 121 #define IPTOS_DSCP_EF 0xb8 122 #define IPTOS_DSCP_CS6 0xc0 123 #define IPTOS_DSCP_CS7 0xe0 124 125 /* 126 * ECN (Explicit Congestion Notification) codepoints in RFC3168 127 * mapped to the lower 2 bits of the TOS field. 128 */ 129 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 130 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 131 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 132 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 133 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 134 135 /* 136 * Definitions for options. 137 */ 138 #define IPOPT_COPIED(o) ((o)&0x80) 139 #define IPOPT_CLASS(o) ((o)&0x60) 140 #define IPOPT_NUMBER(o) ((o)&0x1f) 141 142 #define IPOPT_CONTROL 0x00 143 #define IPOPT_RESERVED1 0x20 144 #define IPOPT_DEBMEAS 0x40 145 #define IPOPT_RESERVED2 0x60 146 147 #define IPOPT_EOL 0 /* end of option list */ 148 #define IPOPT_NOP 1 /* no operation */ 149 150 #define IPOPT_RR 7 /* record packet route */ 151 #define IPOPT_TS 68 /* timestamp */ 152 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 153 #define IPOPT_LSRR 131 /* loose source route */ 154 #define IPOPT_SATID 136 /* satnet id */ 155 #define IPOPT_SSRR 137 /* strict source route */ 156 #define IPOPT_RA 148 /* router alert */ 157 158 /* 159 * Offsets to fields in options other than EOL and NOP. 160 */ 161 #define IPOPT_OPTVAL 0 /* option ID */ 162 #define IPOPT_OLEN 1 /* option length */ 163 #define IPOPT_OFFSET 2 /* offset within option */ 164 #define IPOPT_MINOFF 4 /* min value of above */ 165 166 /* 167 * Time stamp option structure. 168 */ 169 struct ip_timestamp { 170 u_int8_t ipt_code; /* IPOPT_TS */ 171 u_int8_t ipt_len; /* size of structure (variable) */ 172 u_int8_t ipt_ptr; /* index of current entry */ 173 #if _BYTE_ORDER == _LITTLE_ENDIAN 174 u_int ipt_flg:4, /* flags, see below */ 175 ipt_oflw:4; /* overflow counter */ 176 #endif 177 #if _BYTE_ORDER == _BIG_ENDIAN 178 u_int ipt_oflw:4, /* overflow counter */ 179 ipt_flg:4; /* flags, see below */ 180 #endif 181 union ipt_timestamp { 182 u_int32_t ipt_time[1]; 183 struct ipt_ta { 184 struct in_addr ipt_addr; 185 u_int32_t 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 #ifdef _KERNEL 215 216 /* Maximum length for IP protocol queues */ 217 #define IPQ_MAXLEN 2048 218 219 /* 220 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 221 * checksums. For the Internet checksum, struct ipovly can be used instead. 222 * For stronger checksums, the real thing must be used. 223 */ 224 struct ippseudo { 225 struct in_addr ippseudo_src; /* source internet address */ 226 struct in_addr ippseudo_dst; /* destination internet address */ 227 u_int8_t ippseudo_pad; /* pad, must be zero */ 228 u_int8_t ippseudo_p; /* protocol */ 229 u_int16_t ippseudo_len; /* protocol length */ 230 }; 231 #endif /* _KERNEL */ 232 233 #endif /* _NETINET_IP_H_ */ 234