1335640Shselasky/*- 2335640Shselasky * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3335640Shselasky * The Regents of the University of California. All rights reserved. 4335640Shselasky * 5335640Shselasky * This code is derived from the Stanford/CMU enet packet filter, 6335640Shselasky * (net/enet.c) distributed as part of 4.3BSD, and code contributed 7335640Shselasky * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 8335640Shselasky * Berkeley Laboratory. 9335640Shselasky * 10335640Shselasky * Redistribution and use in source and binary forms, with or without 11335640Shselasky * modification, are permitted provided that the following conditions 12335640Shselasky * are met: 13335640Shselasky * 1. Redistributions of source code must retain the above copyright 14335640Shselasky * notice, this list of conditions and the following disclaimer. 15335640Shselasky * 2. Redistributions in binary form must reproduce the above copyright 16335640Shselasky * notice, this list of conditions and the following disclaimer in the 17335640Shselasky * documentation and/or other materials provided with the distribution. 18335640Shselasky * 3. All advertising materials mentioning features or use of this software 19335640Shselasky * must display the following acknowledgement: 20335640Shselasky * This product includes software developed by the University of 21335640Shselasky * California, Berkeley and its contributors. 22335640Shselasky * 4. Neither the name of the University nor the names of its contributors 23335640Shselasky * may be used to endorse or promote products derived from this software 24335640Shselasky * without specific prior written permission. 25335640Shselasky * 26335640Shselasky * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27335640Shselasky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28335640Shselasky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29335640Shselasky * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30335640Shselasky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31335640Shselasky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32335640Shselasky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33335640Shselasky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34335640Shselasky * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35335640Shselasky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36335640Shselasky * SUCH DAMAGE. 37335640Shselasky */ 38335640Shselasky 39335640Shselasky/* 40335640Shselasky * For captures on Linux cooked sockets, we construct a fake header 41335640Shselasky * that includes: 42335640Shselasky * 43335640Shselasky * a 2-byte "packet type" which is one of: 44335640Shselasky * 45335640Shselasky * LINUX_SLL_HOST packet was sent to us 46335640Shselasky * LINUX_SLL_BROADCAST packet was broadcast 47335640Shselasky * LINUX_SLL_MULTICAST packet was multicast 48335640Shselasky * LINUX_SLL_OTHERHOST packet was sent to somebody else 49335640Shselasky * LINUX_SLL_OUTGOING packet was sent *by* us; 50335640Shselasky * 51335640Shselasky * a 2-byte Ethernet protocol field; 52335640Shselasky * 53335640Shselasky * a 2-byte link-layer type; 54335640Shselasky * 55335640Shselasky * a 2-byte link-layer address length; 56335640Shselasky * 57335640Shselasky * an 8-byte source link-layer address, whose actual length is 58335640Shselasky * specified by the previous value. 59335640Shselasky * 60335640Shselasky * All fields except for the link-layer address are in network byte order. 61335640Shselasky * 62335640Shselasky * DO NOT change the layout of this structure, or change any of the 63335640Shselasky * LINUX_SLL_ values below. If you must change the link-layer header 64335640Shselasky * for a "cooked" Linux capture, introduce a new DLT_ type (ask 65335640Shselasky * "tcpdump-workers@lists.tcpdump.org" for one, so that you don't give it 66335640Shselasky * a value that collides with a value already being used), and use the 67335640Shselasky * new header in captures of that type, so that programs that can 68335640Shselasky * handle DLT_LINUX_SLL captures will continue to handle them correctly 69335640Shselasky * without any change, and so that capture files with different headers 70335640Shselasky * can be told apart and programs that read them can dissect the 71335640Shselasky * packets in them. 72335640Shselasky */ 73335640Shselasky 74335640Shselasky#ifndef lib_pcap_sll_h 75335640Shselasky#define lib_pcap_sll_h 76335640Shselasky 77356341Scy#include <pcap/pcap-inttypes.h> 78356341Scy 79335640Shselasky/* 80335640Shselasky * A DLT_LINUX_SLL fake link-layer header. 81335640Shselasky */ 82335640Shselasky#define SLL_HDR_LEN 16 /* total header length */ 83335640Shselasky#define SLL_ADDRLEN 8 /* length of address field */ 84335640Shselasky 85335640Shselaskystruct sll_header { 86335640Shselasky uint16_t sll_pkttype; /* packet type */ 87335640Shselasky uint16_t sll_hatype; /* link-layer address type */ 88335640Shselasky uint16_t sll_halen; /* link-layer address length */ 89356341Scy uint8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */ 90335640Shselasky uint16_t sll_protocol; /* protocol */ 91335640Shselasky}; 92335640Shselasky 93335640Shselasky/* 94356341Scy * A DLT_LINUX_SLL2 fake link-layer header. 95335640Shselasky */ 96356341Scy#define SLL2_HDR_LEN 20 /* total header length */ 97356341Scy 98356341Scystruct sll2_header { 99356341Scy uint16_t sll2_protocol; /* protocol */ 100356341Scy uint16_t sll2_reserved_mbz; /* reserved - must be zero */ 101356341Scy uint32_t sll2_if_index; /* 1-based interface index */ 102356341Scy uint16_t sll2_hatype; /* link-layer address type */ 103356341Scy uint8_t sll2_pkttype; /* packet type */ 104356341Scy uint8_t sll2_halen; /* link-layer address length */ 105356341Scy uint8_t sll2_addr[SLL_ADDRLEN]; /* link-layer address */ 106356341Scy}; 107356341Scy 108356341Scy/* 109356341Scy * The LINUX_SLL_ values for "sll_pkttype" and LINUX_SLL2_ values for 110356341Scy * "sll2_pkttype"; these correspond to the PACKET_ values on Linux, 111356341Scy * which are defined by a header under include/uapi in the current 112356341Scy * kernel source, and are thus not going to change on Linux. We 113356341Scy * define them here so that they're available even on systems other 114356341Scy * than Linux. 115356341Scy */ 116335640Shselasky#define LINUX_SLL_HOST 0 117335640Shselasky#define LINUX_SLL_BROADCAST 1 118335640Shselasky#define LINUX_SLL_MULTICAST 2 119335640Shselasky#define LINUX_SLL_OTHERHOST 3 120335640Shselasky#define LINUX_SLL_OUTGOING 4 121335640Shselasky 122335640Shselasky/* 123356341Scy * The LINUX_SLL_ values for "sll_protocol" and LINUX_SLL2_ values for 124356341Scy * "sll2_protocol"; these correspond to the ETH_P_ values on Linux, but 125356341Scy * are defined here so that they're available even on systems other than 126356341Scy * Linux. We assume, for now, that the ETH_P_ values won't change in 127356341Scy * Linux; if they do, then: 128335640Shselasky * 129335640Shselasky * if we don't translate them in "pcap-linux.c", capture files 130335640Shselasky * won't necessarily be readable if captured on a system that 131335640Shselasky * defines ETH_P_ values that don't match these values; 132335640Shselasky * 133335640Shselasky * if we do translate them in "pcap-linux.c", that makes life 134335640Shselasky * unpleasant for the BPF code generator, as the values you test 135335640Shselasky * for in the kernel aren't the values that you test for when 136335640Shselasky * reading a capture file, so the fixup code run on BPF programs 137335640Shselasky * handed to the kernel ends up having to do more work. 138335640Shselasky * 139335640Shselasky * Add other values here as necessary, for handling packet types that 140335640Shselasky * might show up on non-Ethernet, non-802.x networks. (Not all the ones 141335640Shselasky * in the Linux "if_ether.h" will, I suspect, actually show up in 142335640Shselasky * captures.) 143335640Shselasky */ 144335640Shselasky#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */ 145335640Shselasky#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */ 146335640Shselasky#define LINUX_SLL_P_CAN 0x000C /* CAN frames, with SocketCAN pseudo-headers */ 147335640Shselasky#define LINUX_SLL_P_CANFD 0x000D /* CAN FD frames, with SocketCAN pseudo-headers */ 148335640Shselasky 149335640Shselasky#endif 150