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Member "libpcap-1.9.1/./pcap/sll.h" (30 Sep 2019, 6311 Bytes) of package /linux/misc/libpcap-1.9.1.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 
   39 /*
   40  * For captures on Linux cooked sockets, we construct a fake header
   41  * that includes:
   42  *
   43  *  a 2-byte "packet type" which is one of:
   44  *
   45  *      LINUX_SLL_HOST      packet was sent to us
   46  *      LINUX_SLL_BROADCAST packet was broadcast
   47  *      LINUX_SLL_MULTICAST packet was multicast
   48  *      LINUX_SLL_OTHERHOST packet was sent to somebody else
   49  *      LINUX_SLL_OUTGOING  packet was sent *by* us;
   50  *
   51  *  a 2-byte Ethernet protocol field;
   52  *
   53  *  a 2-byte link-layer type;
   54  *
   55  *  a 2-byte link-layer address length;
   56  *
   57  *  an 8-byte source link-layer address, whose actual length is
   58  *  specified by the previous value.
   59  *
   60  * All fields except for the link-layer address are in network byte order.
   61  *
   62  * DO NOT change the layout of this structure, or change any of the
   63  * LINUX_SLL_ values below.  If you must change the link-layer header
   64  * for a "cooked" Linux capture, introduce a new DLT_ type (ask
   65  * "tcpdump-workers@lists.tcpdump.org" for one, so that you don't give it
   66  * a value that collides with a value already being used), and use the
   67  * new header in captures of that type, so that programs that can
   68  * handle DLT_LINUX_SLL captures will continue to handle them correctly
   69  * without any change, and so that capture files with different headers
   70  * can be told apart and programs that read them can dissect the
   71  * packets in them.
   72  */
   73 
   74 #ifndef lib_pcap_sll_h
   75 #define lib_pcap_sll_h
   76 
   77 #include <pcap/pcap-inttypes.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 struct sll_header {
   86     uint16_t sll_pkttype;       /* packet type */
   87     uint16_t sll_hatype;        /* link-layer address type */
   88     uint16_t sll_halen;     /* link-layer address length */
   89     uint8_t  sll_addr[SLL_ADDRLEN]; /* link-layer address */
   90     uint16_t sll_protocol;      /* protocol */
   91 };
   92 
   93 /*
   94  * A DLT_LINUX_SLL2 fake link-layer header.
   95  */
   96 #define SLL2_HDR_LEN    20      /* total header length */
   97 
   98 struct sll2_header {
   99     uint16_t sll2_protocol;         /* protocol */
  100     uint16_t sll2_reserved_mbz;     /* reserved - must be zero */
  101     uint32_t sll2_if_index;         /* 1-based interface index */
  102     uint16_t sll2_hatype;           /* link-layer address type */
  103     uint8_t  sll2_pkttype;          /* packet type */
  104     uint8_t  sll2_halen;            /* link-layer address length */
  105     uint8_t  sll2_addr[SLL_ADDRLEN];    /* link-layer address */
  106 };
  107 
  108 /*
  109  * The LINUX_SLL_ values for "sll_pkttype" and LINUX_SLL2_ values for
  110  * "sll2_pkttype"; these correspond to the PACKET_ values on Linux,
  111  * which are defined by a header under include/uapi in the current
  112  * kernel source, and are thus not going to change on Linux.  We
  113  * define them here so that they're available even on systems other
  114  * than Linux.
  115  */
  116 #define LINUX_SLL_HOST      0
  117 #define LINUX_SLL_BROADCAST 1
  118 #define LINUX_SLL_MULTICAST 2
  119 #define LINUX_SLL_OTHERHOST 3
  120 #define LINUX_SLL_OUTGOING  4
  121 
  122 /*
  123  * The LINUX_SLL_ values for "sll_protocol" and LINUX_SLL2_ values for
  124  * "sll2_protocol"; these correspond to the ETH_P_ values on Linux, but
  125  * are defined here so that they're available even on systems other than
  126  * Linux.  We assume, for now, that the ETH_P_ values won't change in
  127  * Linux; if they do, then:
  128  *
  129  *  if we don't translate them in "pcap-linux.c", capture files
  130  *  won't necessarily be readable if captured on a system that
  131  *  defines ETH_P_ values that don't match these values;
  132  *
  133  *  if we do translate them in "pcap-linux.c", that makes life
  134  *  unpleasant for the BPF code generator, as the values you test
  135  *  for in the kernel aren't the values that you test for when
  136  *  reading a capture file, so the fixup code run on BPF programs
  137  *  handed to the kernel ends up having to do more work.
  138  *
  139  * Add other values here as necessary, for handling packet types that
  140  * might show up on non-Ethernet, non-802.x networks.  (Not all the ones
  141  * in the Linux "if_ether.h" will, I suspect, actually show up in
  142  * captures.)
  143  */
  144 #define LINUX_SLL_P_802_3   0x0001  /* Novell 802.3 frames without 802.2 LLC header */
  145 #define LINUX_SLL_P_802_2   0x0004  /* 802.2 frames (not D/I/X Ethernet) */
  146 #define LINUX_SLL_P_CAN     0x000C  /* CAN frames, with SocketCAN pseudo-headers */
  147 #define LINUX_SLL_P_CANFD   0x000D  /* CAN FD frames, with SocketCAN pseudo-headers */
  148 
  149 #endif