1 /*- 2 * 3 * $Header: /cvsroot/jnettop/jnettop/include/sll.h,v 1.3 2002/08/31 17:15:03 merunka Exp $ 4 * 5 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from the Stanford/CMU enet packet filter, 9 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 10 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 11 * Berkeley Laboratory. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 */ 42 43 /* 44 * For captures on Linux cooked sockets, we construct a fake header 45 * that includes: 46 * 47 * a 2-byte "packet type" which is one of: 48 * 49 * LINUX_SLL_HOST packet was sent to us 50 * LINUX_SLL_BROADCAST packet was broadcast 51 * LINUX_SLL_MULTICAST packet was multicast 52 * LINUX_SLL_OTHERHOST packet was sent to somebody else 53 * LINUX_SLL_OUTGOING packet was sent *by* us; 54 * 55 * a 2-byte Ethernet protocol field; 56 * 57 * a 2-byte link-layer type; 58 * 59 * a 2-byte link-layer address length; 60 * 61 * an 8-byte source link-layer address, whose actual length is 62 * specified by the previous value. 63 * 64 * All fields except for the link-layer address are in network byte order. 65 * 66 * DO NOT change the layout of this structure, or change any of the 67 * LINUX_SLL_ values below. If you must change the link-layer header 68 * for a "cooked" Linux capture, introduce a new DLT_ type (ask 69 * "tcpdump-workers@tcpdump.org" for one, so that you don't give it a 70 * value that collides with a value already being used), and use the 71 * new header in captures of that type, so that programs that can 72 * handle DLT_LINUX_SLL captures will continue to handle them correctly 73 * without any change, and so that capture files with different headers 74 * can be told apart and programs that read them can dissect the 75 * packets in them. 76 * 77 * This structure, and the #defines below, must be the same in the 78 * libpcap and tcpdump versions of "sll.h". 79 */ 80 81 /* 82 * A DLT_LINUX_SLL fake link-layer header. 83 */ 84 #define SLL_HDR_LEN 16 /* total header length */ 85 #define SLL_ADDRLEN 8 /* length of address field */ 86 87 struct sll_header { 88 guint16 sll_pkttype; /* packet type */ 89 guint16 sll_hatype; /* link-layer address type */ 90 guint16 sll_halen; /* link-layer address length */ 91 guint8 sll_addr[SLL_ADDRLEN]; /* link-layer address */ 92 guint16 sll_protocol; /* protocol */ 93 }; 94 95 /* 96 * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the 97 * PACKET_ values on Linux, but are defined here so that they're 98 * available even on systems other than Linux, and so that they 99 * don't change even if the PACKET_ values change. 100 */ 101 #define LINUX_SLL_HOST 0 102 #define LINUX_SLL_BROADCAST 1 103 #define LINUX_SLL_MULTICAST 2 104 #define LINUX_SLL_OTHERHOST 3 105 #define LINUX_SLL_OUTGOING 4 106 107 /* 108 * The LINUX_SLL_ values for "sll_protocol"; these correspond to the 109 * ETH_P_ values on Linux, but are defined here so that they're 110 * available even on systems other than Linux. We assume, for now, 111 * that the ETH_P_ values won't change in Linux; if they do, then: 112 * 113 * if we don't translate them in "pcap-linux.c", capture files 114 * won't necessarily be readable if captured on a system that 115 * defines ETH_P_ values that don't match these values; 116 * 117 * if we do translate them in "pcap-linux.c", that makes life 118 * unpleasant for the BPF code generator, as the values you test 119 * for in the kernel aren't the values that you test for when 120 * reading a capture file, so the fixup code run on BPF programs 121 * handed to the kernel ends up having to do more work. 122 * 123 * Add other values here as necessary, for handling packet types that 124 * might show up on non-Ethernet, non-802.x networks. (Not all the ones 125 * in the Linux "if_ether.h" will, I suspect, actually show up in 126 * captures.) 127 */ 128 #define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */ 129 #define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */ 130