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Member "daq-2.0.7/sfbpf/sll.h" (8 Apr 2020, 5749 Bytes) of package /linux/misc/daq-2.0.7.tar.gz:


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    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: //depot/firepower/daq-opensource/DAQ_2_0_7/sfbpf/sll.h#1 $ (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@lists.tcpdump.org" for one, so that you don't give it
   68  * a 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 #ifndef lib_pcap_sll_h
   77 #define lib_pcap_sll_h
   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 #if defined (__SVR4) && defined (__sun)
   86 
   87 typedef uint8_t u_int8_t;
   88 typedef uint16_t u_int16_t;
   89 
   90 #endif /* defined (__SVR4) && defined (__sun) */
   91 
   92 struct sll_header
   93 {
   94     u_int16_t sll_pkttype;      /* packet type */
   95     u_int16_t sll_hatype;       /* link-layer address type */
   96     u_int16_t sll_halen;        /* link-layer address length */
   97     u_int8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
   98     u_int16_t sll_protocol;     /* protocol */
   99 };
  100 
  101 /*
  102  * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
  103  * PACKET_ values on Linux, but are defined here so that they're
  104  * available even on systems other than Linux, and so that they
  105  * don't change even if the PACKET_ values change.
  106  */
  107 #define LINUX_SLL_HOST      0
  108 #define LINUX_SLL_BROADCAST 1
  109 #define LINUX_SLL_MULTICAST 2
  110 #define LINUX_SLL_OTHERHOST 3
  111 #define LINUX_SLL_OUTGOING  4
  112 
  113 /*
  114  * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
  115  * ETH_P_ values on Linux, but are defined here so that they're
  116  * available even on systems other than Linux.  We assume, for now,
  117  * that the ETH_P_ values won't change in Linux; if they do, then:
  118  *
  119  *  if we don't translate them in "pcap-linux.c", capture files
  120  *  won't necessarily be readable if captured on a system that
  121  *  defines ETH_P_ values that don't match these values;
  122  *
  123  *  if we do translate them in "pcap-linux.c", that makes life
  124  *  unpleasant for the BPF code generator, as the values you test
  125  *  for in the kernel aren't the values that you test for when
  126  *  reading a capture file, so the fixup code run on BPF programs
  127  *  handed to the kernel ends up having to do more work.
  128  *
  129  * Add other values here as necessary, for handling packet types that
  130  * might show up on non-Ethernet, non-802.x networks.  (Not all the ones
  131  * in the Linux "if_ether.h" will, I suspect, actually show up in
  132  * captures.)
  133  */
  134 #define LINUX_SLL_P_802_3   0x0001  /* Novell 802.3 frames without 802.2 LLC header */
  135 #define LINUX_SLL_P_802_2   0x0004  /* 802.2 frames (not D/I/X Ethernet) */
  136 
  137 #endif