ip.h revision 1.29
1 /* $NetBSD: ip.h,v 1.29 2006/12/17 20:07:36 christos 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 } __attribute__((__packed__)); 69 70 #define IP_MAXPACKET 65535 /* maximum packet size */ 71 72 /* 73 * Definitions for IP type of service (ip_tos) 74 */ 75 #define IPTOS_LOWDELAY 0x10 76 #define IPTOS_THROUGHPUT 0x08 77 #define IPTOS_RELIABILITY 0x04 78 /* IPTOS_LOWCOST 0x02 XXX */ 79 80 /* 81 * Definitions for IP precedence (also in ip_tos) (hopefully unused) 82 */ 83 #define IPTOS_PREC_NETCONTROL 0xe0 84 #define IPTOS_PREC_INTERNETCONTROL 0xc0 85 #define IPTOS_PREC_CRITIC_ECP 0xa0 86 #define IPTOS_PREC_FLASHOVERRIDE 0x80 87 #define IPTOS_PREC_FLASH 0x60 88 #define IPTOS_PREC_IMMEDIATE 0x40 89 #define IPTOS_PREC_PRIORITY 0x20 90 #define IPTOS_PREC_ROUTINE 0x00 91 92 /* 93 * ECN (Explicit Congestion Notification) codepoints in RFC3168 94 * mapped to the lower 2 bits of the TOS field. 95 */ 96 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */ 97 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */ 98 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */ 99 #define IPTOS_ECN_CE 0x03 /* congestion experienced */ 100 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */ 101 102 /* 103 * Definitions for options. 104 */ 105 #define IPOPT_COPIED(o) ((o)&0x80) 106 #define IPOPT_CLASS(o) ((o)&0x60) 107 #define IPOPT_NUMBER(o) ((o)&0x1f) 108 109 #define IPOPT_CONTROL 0x00 110 #define IPOPT_RESERVED1 0x20 111 #define IPOPT_DEBMEAS 0x40 112 #define IPOPT_RESERVED2 0x60 113 114 #define IPOPT_EOL 0 /* end of option list */ 115 #define IPOPT_NOP 1 /* no operation */ 116 117 #define IPOPT_RR 7 /* record packet route */ 118 #define IPOPT_TS 68 /* timestamp */ 119 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 120 #define IPOPT_LSRR 131 /* loose source route */ 121 #define IPOPT_SATID 136 /* satnet id */ 122 #define IPOPT_SSRR 137 /* strict source route */ 123 124 /* 125 * Offsets to fields in options other than EOL and NOP. 126 */ 127 #define IPOPT_OPTVAL 0 /* option ID */ 128 #define IPOPT_OLEN 1 /* option length */ 129 #define IPOPT_OFFSET 2 /* offset within option */ 130 #define IPOPT_MINOFF 4 /* min value of above */ 131 132 /* 133 * Time stamp option structure. 134 */ 135 struct ip_timestamp { 136 u_int8_t ipt_code; /* IPOPT_TS */ 137 u_int8_t ipt_len; /* size of structure (variable) */ 138 u_int8_t ipt_ptr; /* index of current entry */ 139 #if BYTE_ORDER == LITTLE_ENDIAN 140 unsigned int ipt_flg:4, /* flags, see below */ 141 ipt_oflw:4; /* overflow counter */ 142 #endif 143 #if BYTE_ORDER == BIG_ENDIAN 144 unsigned int ipt_oflw:4, /* overflow counter */ 145 ipt_flg:4; /* flags, see below */ 146 #endif 147 union ipt_timestamp { 148 n_time ipt_time[1]; 149 struct ipt_ta { 150 struct in_addr ipt_addr; 151 n_time ipt_time; 152 } ipt_ta[1] __attribute__((__packed__)); 153 } ipt_timestamp __attribute__((__packed__)); 154 } __attribute__((__packed__)); 155 156 /* flag bits for ipt_flg */ 157 #define IPOPT_TS_TSONLY 0 /* timestamps only */ 158 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 159 #define IPOPT_TS_PRESPEC 3 /* specified modules only */ 160 161 /* bits for security (not byte swapped) */ 162 #define IPOPT_SECUR_UNCLASS 0x0000 163 #define IPOPT_SECUR_CONFID 0xf135 164 #define IPOPT_SECUR_EFTO 0x789a 165 #define IPOPT_SECUR_MMMM 0xbc4d 166 #define IPOPT_SECUR_RESTR 0xaf13 167 #define IPOPT_SECUR_SECRET 0xd788 168 #define IPOPT_SECUR_TOPSECRET 0x6bc5 169 170 /* 171 * Internet implementation parameters. 172 */ 173 #define MAXTTL 255 /* maximum time to live (seconds) */ 174 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ 175 #define IPFRAGTTL 60 /* time to live for frags, slowhz */ 176 #define IPTTLDEC 1 /* subtracted when forwarding */ 177 178 #define IP_MSS 576 /* default maximum segment size */ 179 180 /* 181 * This is the real IPv4 pseudo header, used for computing the TCP and UDP 182 * checksums. For the Internet checksum, struct ipovly can be used instead. 183 * For stronger checksums, the real thing must be used. 184 */ 185 struct ippseudo { 186 struct in_addr ippseudo_src; /* source internet address */ 187 struct in_addr ippseudo_dst; /* destination internet address */ 188 u_int8_t ippseudo_pad; /* pad, must be zero */ 189 u_int8_t ippseudo_p; /* protocol */ 190 u_int16_t ippseudo_len; /* protocol length */ 191 } __packed; 192 #endif /* !_NETINET_IP_H_ */ 193 194
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