ip.h (9311B) - Raw
1 /* 2 * Copyright (c) 2000-2016 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * Copyright (c) 1982, 1986, 1993 30 * The Regents of the University of California. All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 3. All advertising materials mentioning features or use of this software 41 * must display the following acknowledgement: 42 * This product includes software developed by the University of 43 * California, Berkeley and its contributors. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip.h 8.2 (Berkeley) 6/1/94 61 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $ 62 */ 63 64 #ifndef _NETINET_IP_H_ 65 #define _NETINET_IP_H_ 66 #include <sys/appleapiopts.h> 67 #include <sys/types.h> /* XXX temporary hack to get u_ types */ 68 69 #include <netinet/in.h> 70 #include <netinet/in_systm.h> 71 72 /* 73 * Definitions for internet protocol version 4. 74 * Per RFC 791, September 1981. 75 */ 76 #define IPVERSION 4 77 78 /* 79 * Structure of an internet header, naked of options. 80 */ 81 struct ip { 82 #ifdef _IP_VHL 83 u_char ip_vhl; /* version << 4 | header length >> 2 */ 84 #else 85 #if BYTE_ORDER == LITTLE_ENDIAN 86 u_int ip_hl:4, /* header length */ 87 ip_v:4; /* version */ 88 #endif 89 #if BYTE_ORDER == BIG_ENDIAN 90 u_int ip_v:4, /* version */ 91 ip_hl:4; /* header length */ 92 #endif 93 #endif /* not _IP_VHL */ 94 u_char ip_tos; /* type of service */ 95 u_short ip_len; /* total length */ 96 u_short ip_id; /* identification */ 97 u_short ip_off; /* fragment offset field */ 98 #define IP_RF 0x8000 /* reserved fragment flag */ 99 #define IP_DF 0x4000 /* dont fragment flag */ 100 #define IP_MF 0x2000 /* more fragments flag */ 101 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 102 u_char ip_ttl; /* time to live */ 103 u_char ip_p; /* protocol */ 104 u_short ip_sum; /* checksum */ 105 struct in_addr ip_src, ip_dst; /* source and dest address */ 106 }; 107 108 #ifdef _IP_VHL 109 #define IP_MAKE_VHL(v, hl) ((uint8_t)((v) << 4 | (hl))) 110 #define IP_VHL_HL(vhl) ((vhl) & 0x0f) 111 #define IP_VHL_V(vhl) ((vhl) >> 4) 112 #define IP_VHL_BORING 0x45 113 #endif 114 115 #define IP_MAXPACKET 65535 /* maximum packet size */ 116 117 /* 118 * Definitions for IP type of service (ip_tos) 119 */ 120 #define IPTOS_LOWDELAY 0x10 121 #define IPTOS_THROUGHPUT 0x08 122 #define IPTOS_RELIABILITY 0x04 123 #define IPTOS_MINCOST 0x02 124 #if 1 125 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 126 #define IPTOS_CE 0x01 127 #define IPTOS_ECT 0x02 128 #endif 129 130 #define IPTOS_DSCP_SHIFT 2 131 132 /* 133 * ECN (Explicit Congestion Notification) codepoints in RFC3168 134 * mapped to the lower 2 bits of the TOS field. 135 */ 136 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 137 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 138 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 139 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 140 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 141 142 /* 143 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 144 */ 145 #define IPTOS_PREC_NETCONTROL 0xe0 146 #define IPTOS_PREC_INTERNETCONTROL 0xc0 147 #define IPTOS_PREC_CRITIC_ECP 0xa0 148 #define IPTOS_PREC_FLASHOVERRIDE 0x80 149 #define IPTOS_PREC_FLASH 0x60 150 #define IPTOS_PREC_IMMEDIATE 0x40 151 #define IPTOS_PREC_PRIORITY 0x20 152 #define IPTOS_PREC_ROUTINE 0x00 153 154 /* 155 * Definitions for options. 156 */ 157 #define IPOPT_COPIED(o) ((o)&0x80) 158 #define IPOPT_CLASS(o) ((o)&0x60) 159 #define IPOPT_NUMBER(o) ((o)&0x1f) 160 161 #define IPOPT_CONTROL 0x00 162 #define IPOPT_RESERVED1 0x20 163 #define IPOPT_DEBMEAS 0x40 164 #define IPOPT_RESERVED2 0x60 165 166 #define IPOPT_EOL 0 /* end of option list */ 167 #define IPOPT_NOP 1 /* no operation */ 168 169 #define IPOPT_RR 7 /* record packet route */ 170 #define IPOPT_TS 68 /* timestamp */ 171 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 172 #define IPOPT_LSRR 131 /* loose source route */ 173 #define IPOPT_SATID 136 /* satnet id */ 174 #define IPOPT_SSRR 137 /* strict source route */ 175 #define IPOPT_RA 148 /* router alert */ 176 177 /* 178 * Offsets to fields in options other than EOL and NOP. 179 */ 180 #define IPOPT_OPTVAL 0 /* option ID */ 181 #define IPOPT_OLEN 1 /* option length */ 182 #define IPOPT_OFFSET 2 /* offset within option */ 183 #define IPOPT_MINOFF 4 /* min value of above */ 184 185 /* 186 * Time stamp option structure. 187 */ 188 struct ip_timestamp { 189 u_char ipt_code; /* IPOPT_TS */ 190 u_char ipt_len; /* size of structure (variable) */ 191 u_char ipt_ptr; /* index of current entry */ 192 #if BYTE_ORDER == LITTLE_ENDIAN 193 u_int ipt_flg:4, /* flags, see below */ 194 ipt_oflw:4; /* overflow counter */ 195 #endif 196 #if BYTE_ORDER == BIG_ENDIAN 197 u_int ipt_oflw:4, /* overflow counter */ 198 ipt_flg:4; /* flags, see below */ 199 #endif 200 union ipt_timestamp { 201 n_long ipt_time[1]; 202 struct ipt_ta { 203 struct in_addr ipt_addr; 204 n_long ipt_time; 205 } ipt_ta[1]; 206 } ipt_timestamp; 207 }; 208 209 /* flag bits for ipt_flg */ 210 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 211 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 212 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 213 214 /* bits for security (not byte swapped) */ 215 #define IPOPT_SECUR_UNCLASS 0x0000 216 #define IPOPT_SECUR_CONFID 0xf135 217 #define IPOPT_SECUR_EFTO 0x789a 218 #define IPOPT_SECUR_MMMM 0xbc4d 219 #define IPOPT_SECUR_RESTR 0xaf13 220 #define IPOPT_SECUR_SECRET 0xd788 221 #define IPOPT_SECUR_TOPSECRET 0x6bc5 222 223 /* 224 * Internet implementation parameters. 225 */ 226 #define MAXTTL 255 /* maximum time to live (seconds) */ 227 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 228 #define IPFRAGTTL 30 /* time to live for frags (seconds) */ 229 #define IPTTLDEC 1 /* subtracted when forwarding */ 230 231 #define IP_MSS 576 /* default maximum segment size */ 232 233 #endif