128 lines
5.5 KiB
C
128 lines
5.5 KiB
C
/*-
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) $Header: /tcpdump/master/tcpdump/sll.h,v 1.7 2002/12/11 07:14:11 guy Exp $ (LBL)
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*/
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/*
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* For captures on Linux cooked sockets, we construct a fake header
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* that includes:
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*
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* a 2-byte "packet type" which is one of:
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*
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* LINUX_SLL_HOST packet was sent to us
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* LINUX_SLL_BROADCAST packet was broadcast
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* LINUX_SLL_MULTICAST packet was multicast
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* LINUX_SLL_OTHERHOST packet was sent to somebody else
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* LINUX_SLL_OUTGOING packet was sent *by* us;
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*
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* a 2-byte Ethernet protocol field;
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*
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* a 2-byte link-layer type;
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*
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* a 2-byte link-layer address length;
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*
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* an 8-byte source link-layer address, whose actual length is
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* specified by the previous value.
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*
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* All fields except for the link-layer address are in network byte order.
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*
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* DO NOT change the layout of this structure, or change any of the
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* LINUX_SLL_ values below. If you must change the link-layer header
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* for a "cooked" Linux capture, introduce a new DLT_ type (ask
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* "tcpdump-workers@tcpdump.org" for one, so that you don't give it a
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* value that collides with a value already being used), and use the
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* new header in captures of that type, so that programs that can
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* handle DLT_LINUX_SLL captures will continue to handle them correctly
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* without any change, and so that capture files with different headers
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* can be told apart and programs that read them can dissect the
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* packets in them.
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*
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* This structure, and the #defines below, must be the same in the
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* libpcap and tcpdump versions of "sll.h".
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*/
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/*
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* A DLT_LINUX_SLL fake link-layer header.
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*/
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#define SLL_HDR_LEN 16 /* total header length */
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#define SLL_ADDRLEN 8 /* length of address field */
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struct sll_header {
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u_int16_t sll_pkttype; /* packet type */
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u_int16_t sll_hatype; /* link-layer address type */
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u_int16_t sll_halen; /* link-layer address length */
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u_int8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
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u_int16_t sll_protocol; /* protocol */
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};
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/*
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* The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
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* PACKET_ values on Linux, but are defined here so that they're
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* available even on systems other than Linux, and so that they
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* don't change even if the PACKET_ values change.
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*/
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#define LINUX_SLL_HOST 0
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#define LINUX_SLL_BROADCAST 1
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#define LINUX_SLL_MULTICAST 2
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#define LINUX_SLL_OTHERHOST 3
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#define LINUX_SLL_OUTGOING 4
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/*
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* The LINUX_SLL_ values for "sll_protocol"; these correspond to the
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* ETH_P_ values on Linux, but are defined here so that they're
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* available even on systems other than Linux. We assume, for now,
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* that the ETH_P_ values won't change in Linux; if they do, then:
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*
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* if we don't translate them in "pcap-linux.c", capture files
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* won't necessarily be readable if captured on a system that
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* defines ETH_P_ values that don't match these values;
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*
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* if we do translate them in "pcap-linux.c", that makes life
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* unpleasant for the BPF code generator, as the values you test
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* for in the kernel aren't the values that you test for when
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* reading a capture file, so the fixup code run on BPF programs
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* handed to the kernel ends up having to do more work.
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*
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* Add other values here as necessary, for handling packet types that
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* might show up on non-Ethernet, non-802.x networks. (Not all the ones
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* in the Linux "if_ether.h" will, I suspect, actually show up in
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* captures.)
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*/
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#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
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#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
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