686 lines
22 KiB
C
686 lines
22 KiB
C
/*-
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)bpf.h 7.1 (Berkeley) 5/7/91
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*
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* @(#) $Header: /tcpdump/master/libpcap/pcap-bpf.h,v 1.34.2.5 2005/05/27 23:33:00 guy Exp $ (LBL)
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*/
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/*
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* This is libpcap's cut-down version of bpf.h; it includes only
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* the stuff needed for the code generator and the userland BPF
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* interpreter, and the libpcap APIs for setting filters, etc..
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*
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* "pcap-bpf.c" will include the native OS version, as it deals with
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* the OS's BPF implementation.
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*
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* XXX - should this all just be moved to "pcap.h"?
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*/
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#ifndef BPF_MAJOR_VERSION
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* BSD style release date */
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#define BPF_RELEASE 199606
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#ifdef MSDOS /* must be 32-bit */
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typedef long bpf_int32;
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typedef unsigned long bpf_u_int32;
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#else
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typedef int bpf_int32;
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typedef u_int bpf_u_int32;
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#endif
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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next
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* even multiple of BPF_ALIGNMENT.
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*/
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#ifndef __NetBSD__
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#define BPF_ALIGNMENT sizeof(bpf_int32)
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#else
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#define BPF_ALIGNMENT sizeof(long)
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#endif
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#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
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#define BPF_MAXINSNS 512
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#define BPF_MAXBUFSIZE 0x8000
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#define BPF_MINBUFSIZE 32
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/*
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* Structure for "pcap_compile()", "pcap_setfilter()", etc..
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*/
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struct bpf_program {
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u_int bf_len;
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struct bpf_insn *bf_insns;
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};
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/*
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* Struct return by BIOCVERSION. This represents the version number of
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* the filter language described by the instruction encodings below.
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* bpf understands a program iff kernel_major == filter_major &&
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* kernel_minor >= filter_minor, that is, if the value returned by the
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* running kernel has the same major number and a minor number equal
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* equal to or less than the filter being downloaded. Otherwise, the
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* results are undefined, meaning an error may be returned or packets
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* may be accepted haphazardly.
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* It has nothing to do with the source code version.
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*/
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struct bpf_version {
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u_short bv_major;
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u_short bv_minor;
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};
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/* Current version number of filter architecture. */
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#define BPF_MAJOR_VERSION 1
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#define BPF_MINOR_VERSION 1
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/*
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* Data-link level type codes.
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*
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* Do *NOT* add new values to this list without asking
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* "tcpdump-workers@tcpdump.org" for a value. Otherwise, you run the
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* risk of using a value that's already being used for some other purpose,
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* and of having tools that read libpcap-format captures not being able
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* to handle captures with your new DLT_ value, with no hope that they
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* will ever be changed to do so (as that would destroy their ability
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* to read captures using that value for that other purpose).
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*/
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/*
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* These are the types that are the same on all platforms, and that
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* have been defined by <net/bpf.h> for ages.
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*/
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#define DLT_NULL 0 /* BSD loopback encapsulation */
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#define DLT_EN10MB 1 /* Ethernet (10Mb) */
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#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
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#define DLT_AX25 3 /* Amateur Radio AX.25 */
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#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
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#define DLT_CHAOS 5 /* Chaos */
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#define DLT_IEEE802 6 /* IEEE 802 Networks */
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#define DLT_ARCNET 7 /* ARCNET, with BSD-style header */
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#define DLT_SLIP 8 /* Serial Line IP */
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#define DLT_PPP 9 /* Point-to-point Protocol */
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#define DLT_FDDI 10 /* FDDI */
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/*
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* These are types that are different on some platforms, and that
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* have been defined by <net/bpf.h> for ages. We use #ifdefs to
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* detect the BSDs that define them differently from the traditional
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* libpcap <net/bpf.h>
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*
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* XXX - DLT_ATM_RFC1483 is 13 in BSD/OS, and DLT_RAW is 14 in BSD/OS,
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* but I don't know what the right #define is for BSD/OS.
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*/
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#define DLT_ATM_RFC1483 11 /* LLC-encapsulated ATM */
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#ifdef __OpenBSD__
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#define DLT_RAW 14 /* raw IP */
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#else
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#define DLT_RAW 12 /* raw IP */
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#endif
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/*
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* Given that the only OS that currently generates BSD/OS SLIP or PPP
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* is, well, BSD/OS, arguably everybody should have chosen its values
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* for DLT_SLIP_BSDOS and DLT_PPP_BSDOS, which are 15 and 16, but they
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* didn't. So it goes.
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*/
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#if defined(__NetBSD__) || defined(__FreeBSD__)
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#ifndef DLT_SLIP_BSDOS
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#define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */
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#define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */
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#endif
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#else
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#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
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#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
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#endif
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/*
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* 17 is used for DLT_OLD_PFLOG in OpenBSD;
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* OBSOLETE: DLT_PFLOG is 117 in OpenBSD now as well. See below.
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* 18 is used for DLT_PFSYNC in OpenBSD; don't use it for anything else.
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*/
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#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
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/*
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* Apparently Redback uses this for its SmartEdge 400/800. I hope
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* nobody else decided to use it, too.
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*/
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#define DLT_REDBACK_SMARTEDGE 32
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/*
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* These values are defined by NetBSD; other platforms should refrain from
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* using them for other purposes, so that NetBSD savefiles with link
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* types of 50 or 51 can be read as this type on all platforms.
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*/
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#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
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#define DLT_PPP_ETHER 51 /* PPP over Ethernet */
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/*
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* The Axent Raptor firewall - now the Symantec Enterprise Firewall - uses
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* a link-layer type of 99 for the tcpdump it supplies. The link-layer
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* header has 6 bytes of unknown data, something that appears to be an
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* Ethernet type, and 36 bytes that appear to be 0 in at least one capture
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* I've seen.
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*/
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#define DLT_SYMANTEC_FIREWALL 99
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/*
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* Values between 100 and 103 are used in capture file headers as
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* link-layer types corresponding to DLT_ types that differ
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* between platforms; don't use those values for new DLT_ new types.
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*/
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/*
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* This value was defined by libpcap 0.5; platforms that have defined
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* it with a different value should define it here with that value -
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* a link type of 104 in a save file will be mapped to DLT_C_HDLC,
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* whatever value that happens to be, so programs will correctly
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* handle files with that link type regardless of the value of
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* DLT_C_HDLC.
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*
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* The name DLT_C_HDLC was used by BSD/OS; we use that name for source
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* compatibility with programs written for BSD/OS.
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*
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* libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
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* for source compatibility with programs written for libpcap 0.5.
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*/
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#define DLT_C_HDLC 104 /* Cisco HDLC */
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#define DLT_CHDLC DLT_C_HDLC
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#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
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/*
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* 106 is reserved for Linux Classical IP over ATM; it's like DLT_RAW,
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* except when it isn't. (I.e., sometimes it's just raw IP, and
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* sometimes it isn't.) We currently handle it as DLT_LINUX_SLL,
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* so that we don't have to worry about the link-layer header.)
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*/
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/*
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* Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides
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* with other values.
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* DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header
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* (DLCI, etc.).
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*/
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#define DLT_FRELAY 107
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/*
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* OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
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* that the AF_ type in the link-layer header is in network byte order.
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*
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* OpenBSD defines it as 12, but that collides with DLT_RAW, so we
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* define it as 108 here. If OpenBSD picks up this file, it should
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* define DLT_LOOP as 12 in its version, as per the comment above -
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* and should not use 108 as a DLT_ value.
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*/
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#define DLT_LOOP 108
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/*
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* Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's
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* DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other
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* than OpenBSD.
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*/
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#ifdef __OpenBSD__
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#define DLT_ENC 13
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#else
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#define DLT_ENC 109
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#endif
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/*
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* Values between 110 and 112 are reserved for use in capture file headers
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* as link-layer types corresponding to DLT_ types that might differ
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* between platforms; don't use those values for new DLT_ types
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* other than the corresponding DLT_ types.
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*/
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/*
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* This is for Linux cooked sockets.
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*/
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#define DLT_LINUX_SLL 113
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/*
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* Apple LocalTalk hardware.
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*/
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#define DLT_LTALK 114
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/*
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* Acorn Econet.
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*/
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#define DLT_ECONET 115
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/*
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* Reserved for use with OpenBSD ipfilter.
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*/
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#define DLT_IPFILTER 116
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/*
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* OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, but that's DLT_LANE8023
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* in SuSE 6.3, so we can't use 17 for it in capture-file headers.
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*
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* XXX: is there a conflict with DLT_PFSYNC 18 as well?
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*/
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#ifdef __OpenBSD__
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#define DLT_OLD_PFLOG 17
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#define DLT_PFSYNC 18
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#endif
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#define DLT_PFLOG 117
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/*
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* Registered for Cisco-internal use.
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*/
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#define DLT_CISCO_IOS 118
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/*
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* For 802.11 cards using the Prism II chips, with a link-layer
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* header including Prism monitor mode information plus an 802.11
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* header.
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*/
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#define DLT_PRISM_HEADER 119
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/*
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* Reserved for Aironet 802.11 cards, with an Aironet link-layer header
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* (see Doug Ambrisko's FreeBSD patches).
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*/
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#define DLT_AIRONET_HEADER 120
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/*
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* Reserved for Siemens HiPath HDLC.
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*/
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#define DLT_HHDLC 121
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/*
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* This is for RFC 2625 IP-over-Fibre Channel.
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*
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* This is not for use with raw Fibre Channel, where the link-layer
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* header starts with a Fibre Channel frame header; it's for IP-over-FC,
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* where the link-layer header starts with an RFC 2625 Network_Header
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* field.
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*/
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#define DLT_IP_OVER_FC 122
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/*
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* This is for Full Frontal ATM on Solaris with SunATM, with a
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* pseudo-header followed by an AALn PDU.
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*
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* There may be other forms of Full Frontal ATM on other OSes,
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* with different pseudo-headers.
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*
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* If ATM software returns a pseudo-header with VPI/VCI information
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* (and, ideally, packet type information, e.g. signalling, ILMI,
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* LANE, LLC-multiplexed traffic, etc.), it should not use
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* DLT_ATM_RFC1483, but should get a new DLT_ value, so tcpdump
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* and the like don't have to infer the presence or absence of a
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* pseudo-header and the form of the pseudo-header.
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*/
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#define DLT_SUNATM 123 /* Solaris+SunATM */
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/*
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* Reserved as per request from Kent Dahlgren <kent@praesum.com>
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* for private use.
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*/
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#define DLT_RIO 124 /* RapidIO */
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#define DLT_PCI_EXP 125 /* PCI Express */
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#define DLT_AURORA 126 /* Xilinx Aurora link layer */
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/*
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* Header for 802.11 plus a number of bits of link-layer information
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* including radio information, used by some recent BSD drivers as
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* well as the madwifi Atheros driver for Linux.
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*/
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#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus radiotap radio header */
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/*
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* Reserved for the TZSP encapsulation, as per request from
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* Chris Waters <chris.waters@networkchemistry.com>
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* TZSP is a generic encapsulation for any other link type,
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* which includes a means to include meta-information
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* with the packet, e.g. signal strength and channel
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* for 802.11 packets.
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*/
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#define DLT_TZSP 128 /* Tazmen Sniffer Protocol */
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/*
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* BSD's ARCNET headers have the source host, destination host,
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* and type at the beginning of the packet; that's what's handed
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* up to userland via BPF.
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*
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* Linux's ARCNET headers, however, have a 2-byte offset field
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* between the host IDs and the type; that's what's handed up
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* to userland via PF_PACKET sockets.
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*
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* We therefore have to have separate DLT_ values for them.
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*/
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#define DLT_ARCNET_LINUX 129 /* ARCNET */
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/*
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* Juniper-private data link types, as per request from
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* Hannes Gredler <hannes@juniper.net>. The DLT_s are used
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* for passing on chassis-internal metainformation such as
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* QOS profiles, etc..
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*/
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#define DLT_JUNIPER_MLPPP 130
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#define DLT_JUNIPER_MLFR 131
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#define DLT_JUNIPER_ES 132
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#define DLT_JUNIPER_GGSN 133
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#define DLT_JUNIPER_MFR 134
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#define DLT_JUNIPER_ATM2 135
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#define DLT_JUNIPER_SERVICES 136
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#define DLT_JUNIPER_ATM1 137
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/*
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* Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund
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* <dieter@apple.com>. The header that's presented is an Ethernet-like
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* header:
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*
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* #define FIREWIRE_EUI64_LEN 8
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* struct firewire_header {
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* u_char firewire_dhost[FIREWIRE_EUI64_LEN];
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* u_char firewire_shost[FIREWIRE_EUI64_LEN];
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* u_short firewire_type;
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* };
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*
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* with "firewire_type" being an Ethernet type value, rather than,
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* for example, raw GASP frames being handed up.
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*/
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#define DLT_APPLE_IP_OVER_IEEE1394 138
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/*
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* Various SS7 encapsulations, as per a request from Jeff Morriss
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* <jeff.morriss[AT]ulticom.com> and subsequent discussions.
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*/
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#define DLT_MTP2_WITH_PHDR 139 /* pseudo-header with various info, followed by MTP2 */
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#define DLT_MTP2 140 /* MTP2, without pseudo-header */
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#define DLT_MTP3 141 /* MTP3, without pseudo-header or MTP2 */
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#define DLT_SCCP 142 /* SCCP, without pseudo-header or MTP2 or MTP3 */
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/*
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* DOCSIS MAC frames.
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*/
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#define DLT_DOCSIS 143
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/*
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* Linux-IrDA packets. Protocol defined at http://www.irda.org.
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* Those packets include IrLAP headers and above (IrLMP...), but
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* don't include Phy framing (SOF/EOF/CRC & byte stuffing), because Phy
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* framing can be handled by the hardware and depend on the bitrate.
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* This is exactly the format you would get capturing on a Linux-IrDA
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* interface (irdaX), but not on a raw serial port.
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* Note the capture is done in "Linux-cooked" mode, so each packet include
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* a fake packet header (struct sll_header). This is because IrDA packet
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* decoding is dependant on the direction of the packet (incomming or
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* outgoing).
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* When/if other platform implement IrDA capture, we may revisit the
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* issue and define a real DLT_IRDA...
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* Jean II
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*/
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#define DLT_LINUX_IRDA 144
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/*
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* Reserved for IBM SP switch and IBM Next Federation switch.
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*/
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#define DLT_IBM_SP 145
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#define DLT_IBM_SN 146
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/*
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* Reserved for private use. If you have some link-layer header type
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* that you want to use within your organization, with the capture files
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* using that link-layer header type not ever be sent outside your
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* organization, you can use these values.
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*
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* No libpcap release will use these for any purpose, nor will any
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* tcpdump release use them, either.
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*
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* Do *NOT* use these in capture files that you expect anybody not using
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* your private versions of capture-file-reading tools to read; in
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* particular, do *NOT* use them in products, otherwise you may find that
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* people won't be able to use tcpdump, or snort, or Ethereal, or... to
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* read capture files from your firewall/intrusion detection/traffic
|
|
* monitoring/etc. appliance, or whatever product uses that DLT_ value,
|
|
* and you may also find that the developers of those applications will
|
|
* not accept patches to let them read those files.
|
|
*
|
|
* Also, do not use them if somebody might send you a capture using them
|
|
* for *their* private type and tools using them for *your* private type
|
|
* would have to read them.
|
|
*
|
|
* Instead, ask "tcpdump-workers@tcpdump.org" for a new DLT_ value,
|
|
* as per the comment above, and use the type you're given.
|
|
*/
|
|
#define DLT_USER0 147
|
|
#define DLT_USER1 148
|
|
#define DLT_USER2 149
|
|
#define DLT_USER3 150
|
|
#define DLT_USER4 151
|
|
#define DLT_USER5 152
|
|
#define DLT_USER6 153
|
|
#define DLT_USER7 154
|
|
#define DLT_USER8 155
|
|
#define DLT_USER9 156
|
|
#define DLT_USER10 157
|
|
#define DLT_USER11 158
|
|
#define DLT_USER12 159
|
|
#define DLT_USER13 160
|
|
#define DLT_USER14 161
|
|
#define DLT_USER15 162
|
|
|
|
/*
|
|
* For future use with 802.11 captures - defined by AbsoluteValue
|
|
* Systems to store a number of bits of link-layer information
|
|
* including radio information:
|
|
*
|
|
* http://www.shaftnet.org/~pizza/software/capturefrm.txt
|
|
*
|
|
* but it might be used by some non-AVS drivers now or in the
|
|
* future.
|
|
*/
|
|
#define DLT_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */
|
|
|
|
/*
|
|
* Juniper-private data link type, as per request from
|
|
* Hannes Gredler <hannes@juniper.net>. The DLT_s are used
|
|
* for passing on chassis-internal metainformation such as
|
|
* QOS profiles, etc..
|
|
*/
|
|
#define DLT_JUNIPER_MONITOR 164
|
|
|
|
/*
|
|
* Reserved for BACnet MS/TP.
|
|
*/
|
|
#define DLT_BACNET_MS_TP 165
|
|
|
|
/*
|
|
* Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
|
|
*
|
|
* This is used in some OSes to allow a kernel socket filter to distinguish
|
|
* between incoming and outgoing packets, on a socket intended to
|
|
* supply pppd with outgoing packets so it can do dial-on-demand and
|
|
* hangup-on-lack-of-demand; incoming packets are filtered out so they
|
|
* don't cause pppd to hold the connection up (you don't want random
|
|
* input packets such as port scans, packets from old lost connections,
|
|
* etc. to force the connection to stay up).
|
|
*
|
|
* The first byte of the PPP header (0xff03) is modified to accomodate
|
|
* the direction - 0x00 = IN, 0x01 = OUT.
|
|
*/
|
|
#define DLT_PPP_PPPD 166
|
|
|
|
/*
|
|
* Names for backwards compatibility with older versions of some PPP
|
|
* software; new software should use DLT_PPP_PPPD.
|
|
*/
|
|
#define DLT_PPP_WITH_DIRECTION DLT_PPP_PPPD
|
|
#define DLT_LINUX_PPP_WITHDIRECTION DLT_PPP_PPPD
|
|
|
|
/*
|
|
* Juniper-private data link type, as per request from
|
|
* Hannes Gredler <hannes@juniper.net>. The DLT_s are used
|
|
* for passing on chassis-internal metainformation such as
|
|
* QOS profiles, cookies, etc..
|
|
*/
|
|
#define DLT_JUNIPER_PPPOE 167
|
|
#define DLT_JUNIPER_PPPOE_ATM 168
|
|
|
|
#define DLT_GPRS_LLC 169 /* GPRS LLC */
|
|
#define DLT_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
|
|
#define DLT_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */
|
|
|
|
/*
|
|
* Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
|
|
* monitoring equipment.
|
|
*/
|
|
#define DLT_GCOM_T1E1 172
|
|
#define DLT_GCOM_SERIAL 173
|
|
|
|
/*
|
|
* Juniper-private data link type, as per request from
|
|
* Hannes Gredler <hannes@juniper.net>. The DLT_ is used
|
|
* for internal communication to Physical Interface Cards (PIC)
|
|
*/
|
|
#define DLT_JUNIPER_PIC_PEER 174
|
|
|
|
/*
|
|
* Link types requested by Gregor Maier <gregor@endace.com> of Endace
|
|
* Measurement Systems. They add an ERF header (see
|
|
* http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
|
|
* the link-layer header.
|
|
*/
|
|
#define DLT_ERF_ETH 175 /* Ethernet */
|
|
#define DLT_ERF_POS 176 /* Packet-over-SONET */
|
|
|
|
/*
|
|
* Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
|
|
* for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
|
|
* includes additional information before the LAPD header, so it's
|
|
* not necessarily a generic LAPD header.
|
|
*/
|
|
#define DLT_LINUX_LAPD 177
|
|
|
|
/*
|
|
* The instruction encodings.
|
|
*/
|
|
/* instruction classes */
|
|
#define BPF_CLASS(code) ((code) & 0x07)
|
|
#define BPF_LD 0x00
|
|
#define BPF_LDX 0x01
|
|
#define BPF_ST 0x02
|
|
#define BPF_STX 0x03
|
|
#define BPF_ALU 0x04
|
|
#define BPF_JMP 0x05
|
|
#define BPF_RET 0x06
|
|
#define BPF_MISC 0x07
|
|
|
|
/* ld/ldx fields */
|
|
#define BPF_SIZE(code) ((code) & 0x18)
|
|
#define BPF_W 0x00
|
|
#define BPF_H 0x08
|
|
#define BPF_B 0x10
|
|
#define BPF_MODE(code) ((code) & 0xe0)
|
|
#define BPF_IMM 0x00
|
|
#define BPF_ABS 0x20
|
|
#define BPF_IND 0x40
|
|
#define BPF_MEM 0x60
|
|
#define BPF_LEN 0x80
|
|
#define BPF_MSH 0xa0
|
|
|
|
/* alu/jmp fields */
|
|
#define BPF_OP(code) ((code) & 0xf0)
|
|
#define BPF_ADD 0x00
|
|
#define BPF_SUB 0x10
|
|
#define BPF_MUL 0x20
|
|
#define BPF_DIV 0x30
|
|
#define BPF_OR 0x40
|
|
#define BPF_AND 0x50
|
|
#define BPF_LSH 0x60
|
|
#define BPF_RSH 0x70
|
|
#define BPF_NEG 0x80
|
|
#define BPF_JA 0x00
|
|
#define BPF_JEQ 0x10
|
|
#define BPF_JGT 0x20
|
|
#define BPF_JGE 0x30
|
|
#define BPF_JSET 0x40
|
|
#define BPF_SRC(code) ((code) & 0x08)
|
|
#define BPF_K 0x00
|
|
#define BPF_X 0x08
|
|
|
|
/* ret - BPF_K and BPF_X also apply */
|
|
#define BPF_RVAL(code) ((code) & 0x18)
|
|
#define BPF_A 0x10
|
|
|
|
/* misc */
|
|
#define BPF_MISCOP(code) ((code) & 0xf8)
|
|
#define BPF_TAX 0x00
|
|
#define BPF_TXA 0x80
|
|
|
|
/*
|
|
* The instruction data structure.
|
|
*/
|
|
struct bpf_insn {
|
|
u_short code;
|
|
u_char jt;
|
|
u_char jf;
|
|
bpf_int32 k;
|
|
};
|
|
|
|
/*
|
|
* Macros for insn array initializers.
|
|
*/
|
|
#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
|
|
#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
|
|
|
|
#if __STDC__ || defined(__cplusplus)
|
|
extern int bpf_validate(struct bpf_insn *, int);
|
|
extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
|
|
#else
|
|
extern int bpf_validate();
|
|
extern u_int bpf_filter();
|
|
#endif
|
|
|
|
/*
|
|
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
|
|
*/
|
|
#define BPF_MEMWORDS 16
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|