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Annotation of embedaddon/trafshow/sll.h, revision 1.1.1.1

1.1       misho       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: /tcpdump/master/tcpdump/sll.h,v 1.7 2002/12/11 07:14:11 guy 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:  * This structure, and the #defines below, must be the same in the
                     76:  * libpcap and tcpdump versions of "sll.h".
                     77:  */
                     78: 
                     79: /*
                     80:  * A DLT_LINUX_SLL fake link-layer header.
                     81:  */
                     82: #define SLL_HDR_LEN    16              /* total header length */
                     83: #define SLL_ADDRLEN    8               /* length of address field */
                     84: 
                     85: struct sll_header {
                     86:        u_int16_t       sll_pkttype;    /* packet type */
                     87:        u_int16_t       sll_hatype;     /* link-layer address type */
                     88:        u_int16_t       sll_halen;      /* link-layer address length */
                     89:        u_int8_t        sll_addr[SLL_ADDRLEN];  /* link-layer address */
                     90:        u_int16_t       sll_protocol;   /* protocol */
                     91: };
                     92: 
                     93: /*
                     94:  * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
                     95:  * PACKET_ values on Linux, but are defined here so that they're
                     96:  * available even on systems other than Linux, and so that they
                     97:  * don't change even if the PACKET_ values change.
                     98:  */
                     99: #define LINUX_SLL_HOST         0
                    100: #define LINUX_SLL_BROADCAST    1
                    101: #define LINUX_SLL_MULTICAST    2
                    102: #define LINUX_SLL_OTHERHOST    3
                    103: #define LINUX_SLL_OUTGOING     4
                    104: 
                    105: /*
                    106:  * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
                    107:  * ETH_P_ values on Linux, but are defined here so that they're
                    108:  * available even on systems other than Linux.  We assume, for now,
                    109:  * that the ETH_P_ values won't change in Linux; if they do, then:
                    110:  *
                    111:  *     if we don't translate them in "pcap-linux.c", capture files
                    112:  *     won't necessarily be readable if captured on a system that
                    113:  *     defines ETH_P_ values that don't match these values;
                    114:  *
                    115:  *     if we do translate them in "pcap-linux.c", that makes life
                    116:  *     unpleasant for the BPF code generator, as the values you test
                    117:  *     for in the kernel aren't the values that you test for when
                    118:  *     reading a capture file, so the fixup code run on BPF programs
                    119:  *     handed to the kernel ends up having to do more work.
                    120:  *
                    121:  * Add other values here as necessary, for handling packet types that
                    122:  * might show up on non-Ethernet, non-802.x networks.  (Not all the ones
                    123:  * in the Linux "if_ether.h" will, I suspect, actually show up in
                    124:  * captures.)
                    125:  */
                    126: #define LINUX_SLL_P_802_3      0x0001  /* Novell 802.3 frames without 802.2 LLC header */
                    127: #define LINUX_SLL_P_802_2      0x0004  /* 802.2 frames (not D/I/X Ethernet) */