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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/libpcap/pcap/sll.h,v 1.2.2.1 2008-05-30 01:36:06 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@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: 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) */ 128: 129: #endif