Annotation of embedaddon/dhcp/includes/netinet/ip.h, revision 1.1
1.1 ! misho 1: /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd 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 8.1 (Berkeley) 6/10/93
! 36: */
! 37:
! 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: * We declare ip_len and ip_off to be short, rather than u_short
! 48: * pragmatically since otherwise unsigned comparisons can result
! 49: * against negative integers quite easily, and fail in subtle ways.
! 50: */
! 51: struct ip {
! 52: u_int8_t ip_fvhl; /* header length, version */
! 53: u_int8_t ip_tos; /* type of service */
! 54: int16_t ip_len; /* total length */
! 55: u_int16_t ip_id; /* identification */
! 56: int16_t ip_off; /* fragment offset field */
! 57: #define IP_DF 0x4000 /* dont fragment flag */
! 58: #define IP_MF 0x2000 /* more fragments flag */
! 59: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
! 60: u_int8_t ip_ttl; /* time to live */
! 61: u_int8_t ip_p; /* protocol */
! 62: u_int16_t ip_sum; /* checksum */
! 63: struct in_addr ip_src, ip_dst; /* source and dest address */
! 64: };
! 65:
! 66: #define IP_V(iph) ((iph)->ip_fvhl >> 4)
! 67: #define IP_HL(iph) (((iph)->ip_fvhl & 0x0F) << 2)
! 68: #define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4))
! 69: #define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \
! 70: ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F))
! 71:
! 72: #define IP_MAXPACKET 65535 /* maximum packet size */
! 73:
! 74: /*
! 75: * Definitions for IP type of service (ip_tos)
! 76: */
! 77: #define IPTOS_LOWDELAY 0x10
! 78: #define IPTOS_THROUGHPUT 0x08
! 79: #define IPTOS_RELIABILITY 0x04
! 80: /* IPTOS_LOWCOST 0x02 XXX */
! 81:
! 82: /*
! 83: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
! 84: */
! 85: #define IPTOS_PREC_NETCONTROL 0xe0
! 86: #define IPTOS_PREC_INTERNETCONTROL 0xc0
! 87: #define IPTOS_PREC_CRITIC_ECP 0xa0
! 88: #define IPTOS_PREC_FLASHOVERRIDE 0x80
! 89: #define IPTOS_PREC_FLASH 0x60
! 90: #define IPTOS_PREC_IMMEDIATE 0x40
! 91: #define IPTOS_PREC_PRIORITY 0x20
! 92: #define IPTOS_PREC_ROUTINE 0x00
! 93:
! 94: /*
! 95: * Definitions for options.
! 96: */
! 97: #define IPOPT_COPIED(o) ((o)&0x80)
! 98: #define IPOPT_CLASS(o) ((o)&0x60)
! 99: #define IPOPT_NUMBER(o) ((o)&0x1f)
! 100:
! 101: #define IPOPT_CONTROL 0x00
! 102: #define IPOPT_RESERVED1 0x20
! 103: #define IPOPT_DEBMEAS 0x40
! 104: #define IPOPT_RESERVED2 0x60
! 105:
! 106: #define IPOPT_EOL 0 /* end of option list */
! 107: #define IPOPT_NOP 1 /* no operation */
! 108:
! 109: #define IPOPT_RR 7 /* record packet route */
! 110: #define IPOPT_TS 68 /* timestamp */
! 111: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
! 112: #define IPOPT_LSRR 131 /* loose source route */
! 113: #define IPOPT_SATID 136 /* satnet id */
! 114: #define IPOPT_SSRR 137 /* strict source route */
! 115:
! 116: /*
! 117: * Offsets to fields in options other than EOL and NOP.
! 118: */
! 119: #define IPOPT_OPTVAL 0 /* option ID */
! 120: #define IPOPT_OLEN 1 /* option length */
! 121: #define IPOPT_OFFSET 2 /* offset within option */
! 122: #define IPOPT_MINOFF 4 /* min value of above */
! 123:
! 124: /*
! 125: * Time stamp option structure.
! 126: */
! 127: struct ip_timestamp {
! 128: u_int8_t ipt_code; /* IPOPT_TS */
! 129: u_int8_t ipt_len; /* size of structure (variable) */
! 130: u_int8_t ipt_ptr; /* index of current entry */
! 131: u_int8_t ipt_flg_oflw; /* flags, see below, overflow counter */
! 132: union ipt_timestamp {
! 133: u_int32_t ipt_time[1];
! 134: struct ipt_ta {
! 135: struct in_addr ipt_addr;
! 136: u_int32_t ipt_time;
! 137: } ipt_ta[1];
! 138: } ipt_timestamp;
! 139: };
! 140:
! 141: /* flag bits for ipt_flg */
! 142: #define IPOPT_TS_TSONLY 0 /* timestamps only */
! 143: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
! 144: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
! 145:
! 146: /* bits for security (not byte swapped) */
! 147: #define IPOPT_SECUR_UNCLASS 0x0000
! 148: #define IPOPT_SECUR_CONFID 0xf135
! 149: #define IPOPT_SECUR_EFTO 0x789a
! 150: #define IPOPT_SECUR_MMMM 0xbc4d
! 151: #define IPOPT_SECUR_RESTR 0xaf13
! 152: #define IPOPT_SECUR_SECRET 0xd788
! 153: #define IPOPT_SECUR_TOPSECRET 0x6bc5
! 154:
! 155: /*
! 156: * Internet implementation parameters.
! 157: */
! 158: #define MAXTTL 255 /* maximum time to live (seconds) */
! 159: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
! 160: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
! 161: #define IPTTLDEC 1 /* subtracted when forwarding */
! 162:
! 163: #define IP_MSS 576 /* default maximum segment size */
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