Annotation of embedaddon/iftop/ip.h, revision 1.1
1.1 ! misho 1: /* @(#) $Header: /home/pdw/vcvs/repos/iftop/ip.h,v 1.2 2003/06/06 22:42:35 pdw Exp $ (LBL) */
! 2: /*
! 3: * Copyright (c) 1982, 1986, 1993
! 4: * The Regents of the University of California. All rights reserved.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: * 3. All advertising materials mentioning features or use of this software
! 15: * must display the following acknowledgement:
! 16: * This product includes software developed by the University of
! 17: * California, Berkeley and its contributors.
! 18: * 4. Neither the name of the University nor the names of its contributors
! 19: * may be used to endorse or promote products derived from this software
! 20: * without specific prior written permission.
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 32: * SUCH DAMAGE.
! 33: *
! 34: * @(#)ip.h 8.2 (Berkeley) 6/1/94
! 35: */
! 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: * We declare ip_len and ip_off to be short, rather than u_short
! 47: * pragmatically since otherwise unsigned comparisons can result
! 48: * against negative integers quite easily, and fail in subtle ways.
! 49: */
! 50: struct ip {
! 51: u_int8_t ip_vhl; /* header length, version */
! 52: #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4)
! 53: #define IP_HL(ip) ((ip)->ip_vhl & 0x0f)
! 54: u_int8_t ip_tos; /* type of service */
! 55: u_int16_t ip_len; /* total length */
! 56: u_int16_t ip_id; /* identification */
! 57: u_int16_t ip_off; /* fragment offset field */
! 58: #define IP_DF 0x4000 /* dont fragment flag */
! 59: #define IP_MF 0x2000 /* more fragments flag */
! 60: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
! 61: u_int8_t ip_ttl; /* time to live */
! 62: u_int8_t ip_p; /* protocol */
! 63: u_int16_t ip_sum; /* checksum */
! 64: struct in_addr ip_src,ip_dst; /* source and dest address */
! 65: };
! 66:
! 67: #define IP_MAXPACKET 65535 /* maximum packet size */
! 68:
! 69: /*
! 70: * Definitions for IP type of service (ip_tos)
! 71: */
! 72: #define IPTOS_LOWDELAY 0x10
! 73: #define IPTOS_THROUGHPUT 0x08
! 74: #define IPTOS_RELIABILITY 0x04
! 75:
! 76: /*
! 77: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
! 78: */
! 79: #define IPTOS_PREC_NETCONTROL 0xe0
! 80: #define IPTOS_PREC_INTERNETCONTROL 0xc0
! 81: #define IPTOS_PREC_CRITIC_ECP 0xa0
! 82: #define IPTOS_PREC_FLASHOVERRIDE 0x80
! 83: #define IPTOS_PREC_FLASH 0x60
! 84: #define IPTOS_PREC_IMMEDIATE 0x40
! 85: #define IPTOS_PREC_PRIORITY 0x20
! 86: #define IPTOS_PREC_ROUTINE 0x00
! 87:
! 88: /*
! 89: * Definitions for options.
! 90: */
! 91: #define IPOPT_COPIED(o) ((o)&0x80)
! 92: #define IPOPT_CLASS(o) ((o)&0x60)
! 93: #define IPOPT_NUMBER(o) ((o)&0x1f)
! 94:
! 95: #define IPOPT_CONTROL 0x00
! 96: #define IPOPT_RESERVED1 0x20
! 97: #define IPOPT_DEBMEAS 0x40
! 98: #define IPOPT_RESERVED2 0x60
! 99:
! 100: #define IPOPT_EOL 0 /* end of option list */
! 101: #define IPOPT_NOP 1 /* no operation */
! 102:
! 103: #define IPOPT_RR 7 /* record packet route */
! 104: #define IPOPT_TS 68 /* timestamp */
! 105: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
! 106: #define IPOPT_LSRR 131 /* loose source route */
! 107: #define IPOPT_SATID 136 /* satnet id */
! 108: #define IPOPT_SSRR 137 /* strict source route */
! 109:
! 110: /*
! 111: * Offsets to fields in options other than EOL and NOP.
! 112: */
! 113: #define IPOPT_OPTVAL 0 /* option ID */
! 114: #define IPOPT_OLEN 1 /* option length */
! 115: #define IPOPT_OFFSET 2 /* offset within option */
! 116: #define IPOPT_MINOFF 4 /* min value of above */
! 117:
! 118: /*
! 119: * Time stamp option structure.
! 120: */
! 121: struct ip_timestamp {
! 122: u_int8_t ipt_code; /* IPOPT_TS */
! 123: u_int8_t ipt_len; /* size of structure (variable) */
! 124: u_int8_t ipt_ptr; /* index of current entry */
! 125: u_int8_t ipt_oflwflg; /* flags, overflow counter */
! 126: #define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
! 127: #define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
! 128: union ipt_timestamp {
! 129: u_int32_t ipt_time[1];
! 130: struct ipt_ta {
! 131: struct in_addr ipt_addr;
! 132: u_int32_t ipt_time;
! 133: } ipt_ta[1];
! 134: } ipt_timestamp;
! 135: };
! 136:
! 137: /* flag bits for ipt_flg */
! 138: #define IPOPT_TS_TSONLY 0 /* timestamps only */
! 139: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
! 140: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
! 141:
! 142: /* bits for security (not byte swapped) */
! 143: #define IPOPT_SECUR_UNCLASS 0x0000
! 144: #define IPOPT_SECUR_CONFID 0xf135
! 145: #define IPOPT_SECUR_EFTO 0x789a
! 146: #define IPOPT_SECUR_MMMM 0xbc4d
! 147: #define IPOPT_SECUR_RESTR 0xaf13
! 148: #define IPOPT_SECUR_SECRET 0xd788
! 149: #define IPOPT_SECUR_TOPSECRET 0x6bc5
! 150:
! 151: /*
! 152: * Internet implementation parameters.
! 153: */
! 154: #define MAXTTL 255 /* maximum time to live (seconds) */
! 155: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
! 156: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
! 157: #define IPTTLDEC 1 /* subtracted when forwarding */
! 158:
! 159: #define IP_MSS 576 /* default maximum segment size */
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