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files >> //usr/include/pcap/sll.h
/*- * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * This code is derived from the Stanford/CMU enet packet filter, * (net/enet.c) distributed as part of 4.3BSD, and code contributed * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence * Berkeley Laboratory. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * For captures on Linux cooked sockets, we construct a fake header * that includes: * * a 2-byte "packet type" which is one of: * * LINUX_SLL_HOST packet was sent to us * LINUX_SLL_BROADCAST packet was broadcast * LINUX_SLL_MULTICAST packet was multicast * LINUX_SLL_OTHERHOST packet was sent to somebody else * LINUX_SLL_OUTGOING packet was sent *by* us; * * a 2-byte Ethernet protocol field; * * a 2-byte link-layer type; * * a 2-byte link-layer address length; * * an 8-byte source link-layer address, whose actual length is * specified by the previous value. * * All fields except for the link-layer address are in network byte order. * * DO NOT change the layout of this structure, or change any of the * LINUX_SLL_ values below. If you must change the link-layer header * for a "cooked" Linux capture, introduce a new DLT_ type (ask * "tcpdump-workers@lists.tcpdump.org" for one, so that you don't give it * a value that collides with a value already being used), and use the * new header in captures of that type, so that programs that can * handle DLT_LINUX_SLL captures will continue to handle them correctly * without any change, and so that capture files with different headers * can be told apart and programs that read them can dissect the * packets in them. */ #ifndef lib_pcap_sll_h #define lib_pcap_sll_h #include <pcap/pcap-inttypes.h> /* * A DLT_LINUX_SLL fake link-layer header. */ #define SLL_HDR_LEN 16 /* total header length */ #define SLL_ADDRLEN 8 /* length of address field */ struct sll_header { uint16_t sll_pkttype; /* packet type */ uint16_t sll_hatype; /* link-layer address type */ uint16_t sll_halen; /* link-layer address length */ uint8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */ uint16_t sll_protocol; /* protocol */ }; /* * A DLT_LINUX_SLL2 fake link-layer header. */ #define SLL2_HDR_LEN 20 /* total header length */ struct sll2_header { uint16_t sll2_protocol; /* protocol */ uint16_t sll2_reserved_mbz; /* reserved - must be zero */ uint32_t sll2_if_index; /* 1-based interface index */ uint16_t sll2_hatype; /* link-layer address type */ uint8_t sll2_pkttype; /* packet type */ uint8_t sll2_halen; /* link-layer address length */ uint8_t sll2_addr[SLL_ADDRLEN]; /* link-layer address */ }; /* * The LINUX_SLL_ values for "sll_pkttype" and LINUX_SLL2_ values for * "sll2_pkttype"; these correspond to the PACKET_ values on Linux, * which are defined by a header under include/uapi in the current * kernel source, and are thus not going to change on Linux. We * define them here so that they're available even on systems other * than Linux. */ #define LINUX_SLL_HOST 0 #define LINUX_SLL_BROADCAST 1 #define LINUX_SLL_MULTICAST 2 #define LINUX_SLL_OTHERHOST 3 #define LINUX_SLL_OUTGOING 4 /* * The LINUX_SLL_ values for "sll_protocol" and LINUX_SLL2_ values for * "sll2_protocol"; these correspond to the ETH_P_ values on Linux, but * are defined here so that they're available even on systems other than * Linux. We assume, for now, that the ETH_P_ values won't change in * Linux; if they do, then: * * if we don't translate them in "pcap-linux.c", capture files * won't necessarily be readable if captured on a system that * defines ETH_P_ values that don't match these values; * * if we do translate them in "pcap-linux.c", that makes life * unpleasant for the BPF code generator, as the values you test * for in the kernel aren't the values that you test for when * reading a capture file, so the fixup code run on BPF programs * handed to the kernel ends up having to do more work. * * Add other values here as necessary, for handling packet types that * might show up on non-Ethernet, non-802.x networks. (Not all the ones * in the Linux "if_ether.h" will, I suspect, actually show up in * captures.) */ #define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */ #define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */ #define LINUX_SLL_P_CAN 0x000C /* CAN frames, with SocketCAN pseudo-headers */ #define LINUX_SLL_P_CANFD 0x000D /* CAN FD frames, with SocketCAN pseudo-headers */ #endif
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