1 /* $NetBSD: ip.h,v 1.24 2003/04/01 07:39:47 dogcow 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ip.h 8.2 (Berkeley) 6/1/94 36 */ 37 38 #ifndef _NETINET_IP_H_ 39 #define _NETINET_IP_H_ 40 41 /* 42 * Definitions for internet protocol version 4. 43 * Per RFC 791, September 1981. 44 */ 45 #define IPVERSION 4 46 47 /* 48 * Structure of an internet header, naked of options. 49 */ 50 struct ip { 51 #if BYTE_ORDER == LITTLE_ENDIAN 52 u_int8_t ip_hl:4, /* header length */ 53 ip_v:4; /* version */ 54 #endif 55 #if BYTE_ORDER == BIG_ENDIAN 56 u_int8_t ip_v:4, /* version */ 57 ip_hl:4; /* header length */ 58 #endif 59 u_int8_t ip_tos; /* type of service */ 60 u_int16_t ip_len; /* total length */ 61 u_int16_t ip_id; /* identification */ 62 u_int16_t ip_off; /* fragment offset field */ 63 #define IP_RF 0x8000 /* reserved fragment flag */ 64 #define IP_EF 0x8000 /* evil flag, per RFC 3514 */ 65 #define IP_DF 0x4000 /* dont fragment flag */ 66 #define IP_MF 0x2000 /* more fragments flag */ 67 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ 68 u_int8_t ip_ttl; /* time to live */ 69 u_int8_t ip_p; /* protocol */ 70 u_int16_t ip_sum; /* checksum */ 71 struct in_addr ip_src, ip_dst; /* source and dest address */ 72 } __attribute__((__packed__)); 73 74 #define IP_MAXPACKET 65535 /* maximum packet size */ 75 76 /* 77 * Definitions for IP type of service (ip_tos) 78 */ 79 #define IPTOS_LOWDELAY 0x10 80 #define IPTOS_THROUGHPUT 0x08 81 #define IPTOS_RELIABILITY 0x04 82 /* IPTOS_LOWCOST 0x02 XXX */ 83 #if 1 84 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */ 85 #define IPTOS_CE 0x01 /* congestion experienced */ 86 #define IPTOS_ECT 0x02 /* ECN-capable transport */ 87 #endif 88 89 /* 90 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 91 */ 92 #define IPTOS_PREC_NETCONTROL 0xe0 93 #define IPTOS_PREC_INTERNETCONTROL 0xc0 94 #define IPTOS_PREC_CRITIC_ECP 0xa0 95 #define IPTOS_PREC_FLASHOVERRIDE 0x80 96 #define IPTOS_PREC_FLASH 0x60 97 #define IPTOS_PREC_IMMEDIATE 0x40 98 #define IPTOS_PREC_PRIORITY 0x20 99 #define IPTOS_PREC_ROUTINE 0x00 100 101 /* 102 * ECN (Explicit Congestion Notification) codepoints in RFC3168 103 * mapped to the lower 2 bits of the TOS field. 104 */ 105 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 106 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 107 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 108 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 109 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 110 111 /* 112 * Definitions for options. 113 */ 114 #define IPOPT_COPIED(o) ((o)&0x80) 115 #define IPOPT_CLASS(o) ((o)&0x60) 116 #define IPOPT_NUMBER(o) ((o)&0x1f) 117 118 #define IPOPT_CONTROL 0x00 119 #define IPOPT_RESERVED1 0x20 120 #define IPOPT_DEBMEAS 0x40 121 #define IPOPT_RESERVED2 0x60 122 123 #define IPOPT_EOL 0 /* end of option list */ 124 #define IPOPT_NOP 1 /* no operation */ 125 126 #define IPOPT_RR 7 /* record packet route */ 127 #define IPOPT_TS 68 /* timestamp */ 128 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 129 #define IPOPT_LSRR 131 /* loose source route */ 130 #define IPOPT_SATID 136 /* satnet id */ 131 #define IPOPT_SSRR 137 /* strict source route */ 132 133 /* 134 * Offsets to fields in options other than EOL and NOP. 135 */ 136 #define IPOPT_OPTVAL 0 /* option ID */ 137 #define IPOPT_OLEN 1 /* option length */ 138 #define IPOPT_OFFSET 2 /* offset within option */ 139 #define IPOPT_MINOFF 4 /* min value of above */ 140 141 /* 142 * Time stamp option structure. 143 */ 144 struct ip_timestamp { 145 u_int8_t ipt_code; /* IPOPT_TS */ 146 u_int8_t ipt_len; /* size of structure (variable) */ 147 u_int8_t ipt_ptr; /* index of current entry */ 148 #if BYTE_ORDER == LITTLE_ENDIAN 149 u_int8_t ipt_flg:4, /* flags, see below */ 150 ipt_oflw:4; /* overflow counter */ 151 #endif 152 #if BYTE_ORDER == BIG_ENDIAN 153 u_int8_t ipt_oflw:4, /* overflow counter */ 154 ipt_flg:4; /* flags, see below */ 155 #endif 156 union ipt_timestamp { 157 n_time ipt_time[1]; 158 struct ipt_ta { 159 struct in_addr ipt_addr; 160 n_time ipt_time; 161 } ipt_ta[1] __attribute__((__packed__)); 162 } ipt_timestamp __attribute__((__packed__)); 163 } __attribute__((__packed__)); 164 165 /* flag bits for ipt_flg */ 166 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 167 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 168 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 169 170 /* bits for security (not byte swapped) */ 171 #define IPOPT_SECUR_UNCLASS 0x0000 172 #define IPOPT_SECUR_CONFID 0xf135 173 #define IPOPT_SECUR_EFTO 0x789a 174 #define IPOPT_SECUR_MMMM 0xbc4d 175 #define IPOPT_SECUR_RESTR 0xaf13 176 #define IPOPT_SECUR_SECRET 0xd788 177 #define IPOPT_SECUR_TOPSECRET 0x6bc5 178 179 /* 180 * Internet implementation parameters. 181 */ 182 #define MAXTTL 255 /* maximum time to live (seconds) */ 183 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 184 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 185 #define IPTTLDEC 1 /* subtracted when forwarding */ 186 187 #define IP_MSS 576 /* default maximum segment size */ 188 189 #endif /* _NETINET_IP_H_ */ 190