1 /* $NetBSD: ip.h,v 1.39 2022/04/17 21:24:53 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)ip.h 8.2 (Berkeley) 6/1/94 32 */ 33 34 #ifndef _NETINET_IP_H_ 35 #define _NETINET_IP_H_ 36 37 #include <sys/types.h> 38 39 #include <netinet/in.h> 40 #include <netinet/in_systm.h> /* for n_time */ 41 42 /* 43 * Definitions for internet protocol version 4. 44 * Per RFC 791, September 1981. 45 */ 46 #define IPVERSION 4 47 48 /* 49 * Structure of an internet header, naked of options. 50 */ 51 struct ip { 52 #if BYTE_ORDER == LITTLE_ENDIAN 53 unsigned int ip_hl:4, /* header length */ 54 ip_v:4; /* version */ 55 #endif 56 #if BYTE_ORDER == BIG_ENDIAN 57 unsigned int ip_v:4, /* version */ 58 ip_hl:4; /* header length */ 59 #endif 60 u_int8_t ip_tos; /* type of service */ 61 u_int16_t ip_len; /* total length */ 62 u_int16_t ip_id; /* identification */ 63 u_int16_t ip_off; /* fragment offset field */ 64 #define IP_RF 0x8000 /* reserved fragment flag */ 65 #define IP_EF 0x8000 /* evil flag, per RFC 3514 */ 66 #define IP_DF 0x4000 /* dont fragment flag */ 67 #define IP_MF 0x2000 /* more fragments flag */ 68 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 69 u_int8_t ip_ttl; /* time to live */ 70 u_int8_t ip_p; /* protocol */ 71 u_int16_t ip_sum; /* checksum */ 72 struct in_addr ip_src, ip_dst; /* source and dest address */ 73 }; 74 75 #define IP_MAXPACKET 65535 /* maximum packet size */ 76 #define IP_MINFRAGSIZE 69 /* minimum size that can be fraged */ 77 78 /* 79 * Definitions for IP type of service (ip_tos) 80 */ 81 82 /* 83 * Definitions for DiffServ Codepoints as per RFC2474 84 */ 85 #define IPTOS_DSCP_CS0 0x00 86 #define IPTOS_DSCP_CS1 0x20 87 #define IPTOS_DSCP_AF11 0x28 88 #define IPTOS_DSCP_AF12 0x30 89 #define IPTOS_DSCP_AF13 0x38 90 #define IPTOS_DSCP_CS2 0x40 91 #define IPTOS_DSCP_AF21 0x48 92 #define IPTOS_DSCP_AF22 0x50 93 #define IPTOS_DSCP_AF23 0x58 94 #define IPTOS_DSCP_CS3 0x60 95 #define IPTOS_DSCP_AF31 0x68 96 #define IPTOS_DSCP_AF32 0x70 97 #define IPTOS_DSCP_AF33 0x78 98 #define IPTOS_DSCP_CS4 0x80 99 #define IPTOS_DSCP_AF41 0x88 100 #define IPTOS_DSCP_AF42 0x90 101 #define IPTOS_DSCP_AF43 0x98 102 #define IPTOS_DSCP_CS5 0xa0 103 #define IPTOS_DSCP_EF 0xb8 104 #define IPTOS_DSCP_CS6 0xc0 105 #define IPTOS_DSCP_CS7 0xe0 106 107 /* 108 * Definitions for DiffServ Class Selector Codepoints 109 */ 110 #define IPTOS_CLASS_CS0 0x00 111 #define IPTOS_CLASS_CS1 0x20 112 #define IPTOS_CLASS_CS2 0x40 113 #define IPTOS_CLASS_CS3 0x60 114 #define IPTOS_CLASS_CS4 0x80 115 #define IPTOS_CLASS_CS5 0xa0 116 #define IPTOS_CLASS_CS6 0xc0 117 #define IPTOS_CLASS_CS7 0xe0 118 #define IPTOS_CLASS_DEFAULT IPTOS_CLASS_CS0 119 #define IPTOS_CLASS_MASK 0xe0 120 #define IPTOS_CLASS(cs) ((cs) & IPTOS_CLASS_MASK) 121 #define IPTOS_DSCP_MASK 0xfc 122 #define IPTOS_DSCP(cp) ((cp) & IPTOS_DSCP_MASK) 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 #define IPTOS_ECN(cn) ((cn) & IPTOS_ECN_MASK) 134 #define IPTOS_ECN_NOT_ECT 0x00 135 136 /* 137 * Definitions for IP type of service per RFC1349 (ip_tos) 138 * DEPRECATED 139 */ 140 #define IPTOS_LOWDELAY 0x10 141 #define IPTOS_THROUGHPUT 0x08 142 #define IPTOS_RELIABILITY 0x04 143 #define IPTOS_MINCOST 0x02 144 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 145 #define IPTOS_CE 0x01 /* congestion experienced */ 146 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 147 148 /* 149 * Definitions for IP precedence per RFC1195 (also in ip_tos) (hopefully unused) 150 */ 151 #define IPTOS_PREC_NETCONTROL 0xe0 152 #define IPTOS_PREC_INTERNETCONTROL 0xc0 153 #define IPTOS_PREC_CRITIC_ECP 0xa0 154 #define IPTOS_PREC_FLASHOVERRIDE 0x80 155 #define IPTOS_PREC_FLASH 0x60 156 #define IPTOS_PREC_IMMEDIATE 0x40 157 #define IPTOS_PREC_PRIORITY 0x20 158 #define IPTOS_PREC_ROUTINE 0x00 159 160 /* 161 * Definitions for options. 162 */ 163 #define IPOPT_COPIED(o) ((o)&0x80) 164 #define IPOPT_CLASS(o) ((o)&0x60) 165 #define IPOPT_NUMBER(o) ((o)&0x1f) 166 167 #define IPOPT_CONTROL 0x00 168 #define IPOPT_RESERVED1 0x20 169 #define IPOPT_DEBMEAS 0x40 170 #define IPOPT_RESERVED2 0x60 171 172 #define IPOPT_EOL 0 /* end of option list */ 173 #define IPOPT_NOP 1 /* no operation */ 174 175 #define IPOPT_RR 7 /* record packet route */ 176 #define IPOPT_TS 68 /* timestamp */ 177 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 178 #define IPOPT_LSRR 131 /* loose source route */ 179 #define IPOPT_SATID 136 /* satnet id */ 180 #define IPOPT_SSRR 137 /* strict source route */ 181 182 /* 183 * Offsets to fields in options other than EOL and NOP. 184 */ 185 #define IPOPT_OPTVAL 0 /* option ID */ 186 #define IPOPT_OLEN 1 /* option length */ 187 #define IPOPT_OFFSET 2 /* offset within option */ 188 #define IPOPT_MINOFF 4 /* min value of above */ 189 190 /* 191 * Time stamp option structure. 192 */ 193 struct ip_timestamp { 194 u_int8_t ipt_code; /* IPOPT_TS */ 195 u_int8_t ipt_len; /* size of structure (variable) */ 196 u_int8_t ipt_ptr; /* index of current entry */ 197 #if BYTE_ORDER == LITTLE_ENDIAN 198 unsigned int ipt_flg:4, /* flags, see below */ 199 ipt_oflw:4; /* overflow counter */ 200 #endif 201 #if BYTE_ORDER == BIG_ENDIAN 202 unsigned int ipt_oflw:4, /* overflow counter */ 203 ipt_flg:4; /* flags, see below */ 204 #endif 205 union ipt_timestamp { 206 n_time ipt_time[1]; 207 struct ipt_ta { 208 struct in_addr ipt_addr; 209 n_time ipt_time; 210 } ipt_ta[1]; 211 } ipt_timestamp; 212 }; 213 214 /* flag bits for ipt_flg */ 215 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 216 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 217 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 218 219 /* bits for security (not byte swapped) */ 220 #define IPOPT_SECUR_UNCLASS 0x0000 221 #define IPOPT_SECUR_CONFID 0xf135 222 #define IPOPT_SECUR_EFTO 0x789a 223 #define IPOPT_SECUR_MMMM 0xbc4d 224 #define IPOPT_SECUR_RESTR 0xaf13 225 #define IPOPT_SECUR_SECRET 0xd788 226 #define IPOPT_SECUR_TOPSECRET 0x6bc5 227 228 /* 229 * Internet implementation parameters. 230 */ 231 #define MAXTTL 255 /* maximum time to live (seconds) */ 232 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 233 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 234 #define IPTTLDEC 1 /* subtracted when forwarding */ 235 236 #define IP_MSS 576 /* default maximum segment size */ 237 238 /* 239 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 240 * checksums. For the Internet checksum, struct ipovly can be used instead. 241 * For stronger checksums, the real thing must be used. 242 */ 243 struct ippseudo { 244 struct in_addr ippseudo_src; /* source internet address */ 245 struct in_addr ippseudo_dst; /* destination internet address */ 246 u_int8_t ippseudo_pad; /* pad, must be zero */ 247 u_int8_t ippseudo_p; /* protocol */ 248 u_int16_t ippseudo_len; /* protocol length */ 249 }; 250 251 #ifdef __CTASSERT 252 __CTASSERT(sizeof(struct ip) == 20); 253 __CTASSERT(sizeof(struct ip_timestamp) == 12); 254 __CTASSERT(sizeof(struct ippseudo) == 12); 255 #endif 256 257 #endif /* !_NETINET_IP_H_ */ 258
Indexes created Sun Sep 21 14:09:52 GMT 2025