ip.h revision 1.32.12.1
1 /* $NetBSD: ip.h,v 1.32.12.1 2012/11/20 03:02:48 tls 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 <netinet/in_systm.h> /* for n_time */ 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 unsigned int ip_hl:4, /* header length */ 50 ip_v:4; /* version */ 51 #endif 52 #if BYTE_ORDER == BIG_ENDIAN 53 unsigned 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_EF 0x8000 /* evil flag, per RFC 3514 */ 62 #define IP_DF 0x4000 /* dont fragment flag */ 63 #define IP_MF 0x2000 /* more fragments flag */ 64 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 65 u_int8_t ip_ttl; /* time to live */ 66 u_int8_t ip_p; /* protocol */ 67 u_int16_t ip_sum; /* checksum */ 68 struct in_addr ip_src, ip_dst; /* source and dest address */ 69 } __packed; 70 71 #define IP_MAXPACKET 65535 /* maximum packet size */ 72 #define IP_MINFRAGSIZE 69 /* minumum size that can be fraged */ 73 74 /* 75 * Definitions for IP type of service (ip_tos) 76 */ 77 78 /* 79 * Definitions for DiffServ Codepoints as per RFC2474 80 */ 81 #define IPTOS_DSCP_CS0 0x00 82 #define IPTOS_DSCP_CS1 0x20 83 #define IPTOS_DSCP_AF11 0x28 84 #define IPTOS_DSCP_AF12 0x30 85 #define IPTOS_DSCP_AF13 0x38 86 #define IPTOS_DSCP_CS2 0x40 87 #define IPTOS_DSCP_AF21 0x48 88 #define IPTOS_DSCP_AF22 0x50 89 #define IPTOS_DSCP_AF23 0x58 90 #define IPTOS_DSCP_CS3 0x60 91 #define IPTOS_DSCP_AF31 0x68 92 #define IPTOS_DSCP_AF32 0x70 93 #define IPTOS_DSCP_AF33 0x78 94 #define IPTOS_DSCP_CS4 0x80 95 #define IPTOS_DSCP_AF41 0x88 96 #define IPTOS_DSCP_AF42 0x90 97 #define IPTOS_DSCP_AF43 0x98 98 #define IPTOS_DSCP_CS5 0xa0 99 #define IPTOS_DSCP_EF 0xb8 100 #define IPTOS_DSCP_CS6 0xc0 101 #define IPTOS_DSCP_CS7 0xe0 102 103 /* 104 * Definitions for DiffServ Class Selector Codepoints 105 */ 106 #define IPTOS_CLASS_CS0 0x00 107 #define IPTOS_CLASS_CS1 0x20 108 #define IPTOS_CLASS_CS2 0x40 109 #define IPTOS_CLASS_CS3 0x60 110 #define IPTOS_CLASS_CS4 0x80 111 #define IPTOS_CLASS_CS5 0xa0 112 #define IPTOS_CLASS_CS6 0xc0 113 #define IPTOS_CLASS_CS7 0xe0 114 #define IPTOS_CLASS_DEFAULT IPTOS_CLASS_CS0 115 #define IPTOS_CLASS_MASK 0xe0 116 #define IPTOS_CLASS(cs) ((cs) & IPTOS_CLASS_MASK) 117 #define IPTOS_DSCP_MASK 0xfc 118 #define IPTOS_DSCP(cp) ((cp) & IPTOS_DSCP_MASK) 119 120 /* 121 * ECN (Explicit Congestion Notification) codepoints in RFC3168 122 * mapped to the lower 2 bits of the TOS field. 123 */ 124 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 125 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 126 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 127 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 128 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 129 #define IPTOS_ECN(cn) ((cn) & IPTOS_ECN_MASK) 130 #define IPTOS_ECN_NOT_ECT 0x00 131 132 /* 133 * Definitions for IP type of service per RFC1349 (ip_tos) 134 * DEPRECATED 135 */ 136 #define IPTOS_LOWDELAY 0x10 137 #define IPTOS_THROUGHPUT 0x08 138 #define IPTOS_RELIABILITY 0x04 139 #define IPTOS_MINCOST 0x02 140 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 141 #define IPTOS_CE 0x01 /* congestion experienced */ 142 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 143 144 /* 145 * Definitions for IP precedence per RFC1195 (also in ip_tos) (hopefully unused) 146 */ 147 #define IPTOS_PREC_NETCONTROL 0xe0 148 #define IPTOS_PREC_INTERNETCONTROL 0xc0 149 #define IPTOS_PREC_CRITIC_ECP 0xa0 150 #define IPTOS_PREC_FLASHOVERRIDE 0x80 151 #define IPTOS_PREC_FLASH 0x60 152 #define IPTOS_PREC_IMMEDIATE 0x40 153 #define IPTOS_PREC_PRIORITY 0x20 154 #define IPTOS_PREC_ROUTINE 0x00 155 156 /* 157 * Definitions for options. 158 */ 159 #define IPOPT_COPIED(o) ((o)&0x80) 160 #define IPOPT_CLASS(o) ((o)&0x60) 161 #define IPOPT_NUMBER(o) ((o)&0x1f) 162 163 #define IPOPT_CONTROL 0x00 164 #define IPOPT_RESERVED1 0x20 165 #define IPOPT_DEBMEAS 0x40 166 #define IPOPT_RESERVED2 0x60 167 168 #define IPOPT_EOL 0 /* end of option list */ 169 #define IPOPT_NOP 1 /* no operation */ 170 171 #define IPOPT_RR 7 /* record packet route */ 172 #define IPOPT_TS 68 /* timestamp */ 173 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 174 #define IPOPT_LSRR 131 /* loose source route */ 175 #define IPOPT_SATID 136 /* satnet id */ 176 #define IPOPT_SSRR 137 /* strict source route */ 177 178 /* 179 * Offsets to fields in options other than EOL and NOP. 180 */ 181 #define IPOPT_OPTVAL 0 /* option ID */ 182 #define IPOPT_OLEN 1 /* option length */ 183 #define IPOPT_OFFSET 2 /* offset within option */ 184 #define IPOPT_MINOFF 4 /* min value of above */ 185 186 /* 187 * Time stamp option structure. 188 */ 189 struct ip_timestamp { 190 u_int8_t ipt_code; /* IPOPT_TS */ 191 u_int8_t ipt_len; /* size of structure (variable) */ 192 u_int8_t ipt_ptr; /* index of current entry */ 193 #if BYTE_ORDER == LITTLE_ENDIAN 194 unsigned int ipt_flg:4, /* flags, see below */ 195 ipt_oflw:4; /* overflow counter */ 196 #endif 197 #if BYTE_ORDER == BIG_ENDIAN 198 unsigned int ipt_oflw:4, /* overflow counter */ 199 ipt_flg:4; /* flags, see below */ 200 #endif 201 union ipt_timestamp { 202 n_time ipt_time[1]; 203 struct ipt_ta { 204 struct in_addr ipt_addr; 205 n_time ipt_time; 206 } ipt_ta[1] __packed; 207 } ipt_timestamp __packed; 208 } __packed; 209 210 /* flag bits for ipt_flg */ 211 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 212 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 213 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 214 215 /* bits for security (not byte swapped) */ 216 #define IPOPT_SECUR_UNCLASS 0x0000 217 #define IPOPT_SECUR_CONFID 0xf135 218 #define IPOPT_SECUR_EFTO 0x789a 219 #define IPOPT_SECUR_MMMM 0xbc4d 220 #define IPOPT_SECUR_RESTR 0xaf13 221 #define IPOPT_SECUR_SECRET 0xd788 222 #define IPOPT_SECUR_TOPSECRET 0x6bc5 223 224 /* 225 * Internet implementation parameters. 226 */ 227 #define MAXTTL 255 /* maximum time to live (seconds) */ 228 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 229 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 230 #define IPTTLDEC 1 /* subtracted when forwarding */ 231 232 #define IP_MSS 576 /* default maximum segment size */ 233 234 /* 235 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 236 * checksums. For the Internet checksum, struct ipovly can be used instead. 237 * For stronger checksums, the real thing must be used. 238 */ 239 struct ippseudo { 240 struct in_addr ippseudo_src; /* source internet address */ 241 struct in_addr ippseudo_dst; /* destination internet address */ 242 u_int8_t ippseudo_pad; /* pad, must be zero */ 243 u_int8_t ippseudo_p; /* protocol */ 244 u_int16_t ippseudo_len; /* protocol length */ 245 } __packed; 246 #endif /* !_NETINET_IP_H_ */ 247
Indexes created Sat Oct 25 16:10:12 GMT 2025