1 /* $NetBSD: ip.h,v 1.31 2007/12/25 18:33:46 perry 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 /* 38 * Definitions for internet protocol version 4. 39 * Per RFC 791, September 1981. 40 */ 41 #define IPVERSION 4 42 43 /* 44 * Structure of an internet header, naked of options. 45 */ 46 struct ip { 47 #if BYTE_ORDER == LITTLE_ENDIAN 48 unsigned int ip_hl:4, /* header length */ 49 ip_v:4; /* version */ 50 #endif 51 #if BYTE_ORDER == BIG_ENDIAN 52 unsigned int ip_v:4, /* version */ 53 ip_hl:4; /* header length */ 54 #endif 55 u_int8_t ip_tos; /* type of service */ 56 u_int16_t ip_len; /* total length */ 57 u_int16_t ip_id; /* identification */ 58 u_int16_t ip_off; /* fragment offset field */ 59 #define IP_RF 0x8000 /* reserved fragment flag */ 60 #define IP_EF 0x8000 /* evil flag, per RFC 3514 */ 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 } __packed; 69 70 #define IP_MAXPACKET 65535 /* maximum packet size */ 71 #define IP_MINFRAGSIZE 69 /* minumum size that can be fraged */ 72 73 /* 74 * Definitions for IP type of service (ip_tos) 75 */ 76 #define IPTOS_LOWDELAY 0x10 77 #define IPTOS_THROUGHPUT 0x08 78 #define IPTOS_RELIABILITY 0x04 79 /* IPTOS_LOWCOST 0x02 XXX */ 80 81 /* 82 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 83 */ 84 #define IPTOS_PREC_NETCONTROL 0xe0 85 #define IPTOS_PREC_INTERNETCONTROL 0xc0 86 #define IPTOS_PREC_CRITIC_ECP 0xa0 87 #define IPTOS_PREC_FLASHOVERRIDE 0x80 88 #define IPTOS_PREC_FLASH 0x60 89 #define IPTOS_PREC_IMMEDIATE 0x40 90 #define IPTOS_PREC_PRIORITY 0x20 91 #define IPTOS_PREC_ROUTINE 0x00 92 93 /* 94 * ECN (Explicit Congestion Notification) codepoints in RFC3168 95 * mapped to the lower 2 bits of the TOS field. 96 */ 97 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 98 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 99 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 100 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 101 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 102 103 /* 104 * Definitions for options. 105 */ 106 #define IPOPT_COPIED(o) ((o)&0x80) 107 #define IPOPT_CLASS(o) ((o)&0x60) 108 #define IPOPT_NUMBER(o) ((o)&0x1f) 109 110 #define IPOPT_CONTROL 0x00 111 #define IPOPT_RESERVED1 0x20 112 #define IPOPT_DEBMEAS 0x40 113 #define IPOPT_RESERVED2 0x60 114 115 #define IPOPT_EOL 0 /* end of option list */ 116 #define IPOPT_NOP 1 /* no operation */ 117 118 #define IPOPT_RR 7 /* record packet route */ 119 #define IPOPT_TS 68 /* timestamp */ 120 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 121 #define IPOPT_LSRR 131 /* loose source route */ 122 #define IPOPT_SATID 136 /* satnet id */ 123 #define IPOPT_SSRR 137 /* strict source route */ 124 125 /* 126 * Offsets to fields in options other than EOL and NOP. 127 */ 128 #define IPOPT_OPTVAL 0 /* option ID */ 129 #define IPOPT_OLEN 1 /* option length */ 130 #define IPOPT_OFFSET 2 /* offset within option */ 131 #define IPOPT_MINOFF 4 /* min value of above */ 132 133 /* 134 * Time stamp option structure. 135 */ 136 struct ip_timestamp { 137 u_int8_t ipt_code; /* IPOPT_TS */ 138 u_int8_t ipt_len; /* size of structure (variable) */ 139 u_int8_t ipt_ptr; /* index of current entry */ 140 #if BYTE_ORDER == LITTLE_ENDIAN 141 unsigned int ipt_flg:4, /* flags, see below */ 142 ipt_oflw:4; /* overflow counter */ 143 #endif 144 #if BYTE_ORDER == BIG_ENDIAN 145 unsigned int ipt_oflw:4, /* overflow counter */ 146 ipt_flg:4; /* flags, see below */ 147 #endif 148 union ipt_timestamp { 149 n_time ipt_time[1]; 150 struct ipt_ta { 151 struct in_addr ipt_addr; 152 n_time ipt_time; 153 } ipt_ta[1] __packed; 154 } ipt_timestamp __packed; 155 } __packed; 156 157 /* flag bits for ipt_flg */ 158 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 159 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 160 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 161 162 /* bits for security (not byte swapped) */ 163 #define IPOPT_SECUR_UNCLASS 0x0000 164 #define IPOPT_SECUR_CONFID 0xf135 165 #define IPOPT_SECUR_EFTO 0x789a 166 #define IPOPT_SECUR_MMMM 0xbc4d 167 #define IPOPT_SECUR_RESTR 0xaf13 168 #define IPOPT_SECUR_SECRET 0xd788 169 #define IPOPT_SECUR_TOPSECRET 0x6bc5 170 171 /* 172 * Internet implementation parameters. 173 */ 174 #define MAXTTL 255 /* maximum time to live (seconds) */ 175 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 176 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 177 #define IPTTLDEC 1 /* subtracted when forwarding */ 178 179 #define IP_MSS 576 /* default maximum segment size */ 180 181 /* 182 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 183 * checksums. For the Internet checksum, struct ipovly can be used instead. 184 * For stronger checksums, the real thing must be used. 185 */ 186 struct ippseudo { 187 struct in_addr ippseudo_src; /* source internet address */ 188 struct in_addr ippseudo_dst; /* destination internet address */ 189 u_int8_t ippseudo_pad; /* pad, must be zero */ 190 u_int8_t ippseudo_p; /* protocol */ 191 u_int16_t ippseudo_len; /* protocol length */ 192 } __packed; 193 #endif /* !_NETINET_IP_H_ */ 194 195