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Annotation of embedaddon/trafshow/sll.h, revision 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) */