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iftop

    1: /* @(#) $Header: /usr/local/www/users/anoncvs/cvs/embedaddon/iftop/ip.h,v 1.1.1.1 2012/02/21 16:57:34 misho 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 */