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iftop

    1: /*-
    2:  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
    3:  *	The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * This code is derived from the Stanford/CMU enet packet filter,
    6:  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
    7:  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 
    8:  * Berkeley Laboratory.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  * 3. All advertising materials mentioning features or use of this software
   19:  *    must display the following acknowledgement:
   20:  *      This product includes software developed by the University of
   21:  *      California, Berkeley and its contributors.
   22:  * 4. Neither the name of the University nor the names of its contributors
   23:  *    may be used to endorse or promote products derived from this software
   24:  *    without specific prior written permission.
   25:  *
   26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36:  * SUCH DAMAGE.
   37:  *
   38:  * @(#) $Header: /usr/local/www/users/anoncvs/cvs/embedaddon/iftop/sll.h,v 1.1.1.1 2012/02/21 16:57:34 misho Exp $ (LBL)
   39:  */
   40: 
   41: /*
   42:  * For captures on Linux cooked sockets, we construct a fake header
   43:  * that includes:
   44:  *
   45:  *	a 2-byte "packet type" which is one of:
   46:  *
   47:  *		LINUX_SLL_HOST		packet was sent to us
   48:  *		LINUX_SLL_BROADCAST	packet was broadcast
   49:  *		LINUX_SLL_MULTICAST	packet was multicast
   50:  *		LINUX_SLL_OTHERHOST	packet was sent to somebody else
   51:  *		LINUX_SLL_OUTGOING	packet was sent *by* us;
   52:  *
   53:  *	a 2-byte Ethernet protocol field;
   54:  *
   55:  *	a 2-byte link-layer type;
   56:  *
   57:  *	a 2-byte link-layer address length;
   58:  *
   59:  *	an 8-byte source link-layer address, whose actual length is
   60:  *	specified by the previous value.
   61:  *
   62:  * All fields except for the link-layer address are in network byte order.
   63:  *
   64:  * DO NOT change the layout of this structure, or change any of the
   65:  * LINUX_SLL_ values below.  If you must change the link-layer header
   66:  * for a "cooked" Linux capture, introduce a new DLT_ type (ask
   67:  * "tcpdump-workers@tcpdump.org" for one, so that you don't give it a
   68:  * value that collides with a value already being used), and use the
   69:  * new header in captures of that type, so that programs that can
   70:  * handle DLT_LINUX_SLL captures will continue to handle them correctly
   71:  * without any change, and so that capture files with different headers
   72:  * can be told apart and programs that read them can dissect the
   73:  * packets in them.
   74:  */
   75: 
   76: /*
   77:  * A DLT_LINUX_SLL fake link-layer header.
   78:  */
   79: #define SLL_HDR_LEN	16		/* total header length */
   80: #define SLL_ADDRLEN	8		/* length of address field */
   81: 
   82: struct sll_header {
   83: 	u_int16_t sll_pkttype;		/* packet type */
   84: 	u_int16_t sll_hatype;		/* link-layer address type */
   85: 	u_int16_t sll_halen;		/* link-layer address length */
   86: 	u_int8_t sll_addr[SLL_ADDRLEN];	/* link-layer address */
   87: 	u_int16_t sll_protocol;		/* protocol */
   88: };
   89: 
   90: /*
   91:  * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
   92:  * PACKET_ values on Linux, but are defined here so that they're
   93:  * available even on systems other than Linux, and so that they
   94:  * don't change even if the PACKET_ values change.
   95:  */
   96: #define LINUX_SLL_HOST		0
   97: #define LINUX_SLL_BROADCAST	1
   98: #define LINUX_SLL_MULTICAST	2
   99: #define LINUX_SLL_OTHERHOST	3
  100: #define LINUX_SLL_OUTGOING	4
  101: 
  102: /*
  103:  * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
  104:  * ETH_P_ values on Linux, but are defined here so that they're
  105:  * available even on systems other than Linux.  We assume, for now,
  106:  * that the ETH_P_ values won't change in Linux; if they do, then:
  107:  *
  108:  *	if we don't translate them in "pcap-linux.c", capture files
  109:  *	won't necessarily be readable if captured on a system that
  110:  *	defines ETH_P_ values that don't match these values;
  111:  *
  112:  *	if we do translate them in "pcap-linux.c", that makes life
  113:  *	unpleasant for the BPF code generator, as the values you test
  114:  *	for in the kernel aren't the values that you test for when
  115:  *	reading a capture file, so the fixup code run on BPF programs
  116:  *	handed to the kernel ends up having to do more work.
  117:  *
  118:  * Add other values here as necessary, for handling packet types that
  119:  * might show up on non-Ethernet, non-802.x networks.  (Not all the ones
  120:  * in the Linux "if_ether.h" will, I suspect, actually show up in
  121:  * captures.)
  122:  */
  123: #define LINUX_SLL_P_802_3	0x0001	/* Novell 802.3 frames without 802.2 LLC header */
  124: #define LINUX_SLL_P_802_2	0x0004	/* 802.2 frames (not D/I/X Ethernet) */