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2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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.
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.
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.
38 * @(#) $Header: //depot/firepower/daq-opensource/DAQ_2_0_7/sfbpf/sll.h#1 $ (LBL)
42 * For captures on Linux cooked sockets, we construct a fake header
43 * that includes:
45 * a 2-byte "packet type" which is one of:
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;
53 * a 2-byte Ethernet protocol field;
55 * a 2-byte link-layer type;
57 * a 2-byte link-layer address length;
59 * an 8-byte source link-layer address, whose actual length is
60 * specified by the previous value.
62 * All fields except for the link-layer address are in network byte order.
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 * "email@example.com" 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.
76 #ifndef lib_pcap_sll_h
77 #define lib_pcap_sll_h
80 * A DLT_LINUX_SLL fake link-layer header.
82 #define SLL_HDR_LEN 16 /* total header length */
83 #define SLL_ADDRLEN 8 /* length of address field */
85 #if defined (__SVR4) && defined (__sun)
87 typedef uint8_t u_int8_t;
88 typedef uint16_t u_int16_t;
90 #endif /* defined (__SVR4) && defined (__sun) */
92 struct sll_header
94 u_int16_t sll_pkttype; /* packet type */
95 u_int16_t sll_hatype; /* link-layer address type */
96 u_int16_t sll_halen; /* link-layer address length */
97 u_int8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
98 u_int16_t sll_protocol; /* protocol */
102 * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
103 * PACKET_ values on Linux, but are defined here so that they're
104 * available even on systems other than Linux, and so that they
105 * don't change even if the PACKET_ values change.
107 #define LINUX_SLL_HOST 0
108 #define LINUX_SLL_BROADCAST 1
109 #define LINUX_SLL_MULTICAST 2
110 #define LINUX_SLL_OTHERHOST 3
111 #define LINUX_SLL_OUTGOING 4
114 * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
115 * ETH_P_ values on Linux, but are defined here so that they're
116 * available even on systems other than Linux. We assume, for now,
117 * that the ETH_P_ values won't change in Linux; if they do, then:
119 * if we don't translate them in "pcap-linux.c", capture files
120 * won't necessarily be readable if captured on a system that
121 * defines ETH_P_ values that don't match these values;
123 * if we do translate them in "pcap-linux.c", that makes life
124 * unpleasant for the BPF code generator, as the values you test
125 * for in the kernel aren't the values that you test for when
126 * reading a capture file, so the fixup code run on BPF programs
127 * handed to the kernel ends up having to do more work.
129 * Add other values here as necessary, for handling packet types that
130 * might show up on non-Ethernet, non-802.x networks. (Not all the ones
131 * in the Linux "if_ether.h" will, I suspect, actually show up in
132 * captures.)
134 #define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
135 #define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */