/*-

 * 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.

 *

 *      @(#)bpf.h       7.1 (Berkeley) 5/7/91

 *

 * @(#) $Header: /tcpdump/master/libpcap/pcap-bpf.h,v 1.34.2.11 2006/07/27 21:06:17 gianluca Exp $ (LBL)

 */

/*

 * This is libpcap's cut-down version of bpf.h; it includes only

 * the stuff needed for the code generator and the userland BPF

 * interpreter, and the libpcap APIs for setting filters, etc..

 *

 * "pcap-bpf.c" will include the native OS version, as it deals with

 * the OS's BPF implementation.

 *

 * XXX - should this all just be moved to "pcap.h"?

 */

#ifndef BPF_MAJOR_VERSION

#ifdef __cplusplus

extern "C" {

#endif

/* BSD style release date */

#define BPF_RELEASE 199606

#ifdef MSDOS /* must be 32-bit */

typedef long          bpf_int32;

typedef unsigned long bpf_u_int32;

#else

typedef	int bpf_int32;

typedef	u_int bpf_u_int32;

#endif

/*

 * Alignment macros.  BPF_WORDALIGN rounds up to the next 

 * even multiple of BPF_ALIGNMENT. 

 */

#ifndef __NetBSD__

#define BPF_ALIGNMENT sizeof(bpf_int32)

#else

#define BPF_ALIGNMENT sizeof(long)

#endif

#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))

#define BPF_MAXINSNS 512

#define BPF_MAXBUFSIZE 0x8000

#define BPF_MINBUFSIZE 32

/*

 * Structure for "pcap_compile()", "pcap_setfilter()", etc..

 */

struct bpf_program {

	u_int bf_len;

	struct bpf_insn *bf_insns;

};

/*

 * Struct return by BIOCVERSION.  This represents the version number of 

 * the filter language described by the instruction encodings below.

 * bpf understands a program iff kernel_major == filter_major &&

 * kernel_minor >= filter_minor, that is, if the value returned by the

 * running kernel has the same major number and a minor number equal

 * equal to or less than the filter being downloaded.  Otherwise, the

 * results are undefined, meaning an error may be returned or packets

 * may be accepted haphazardly.

 * It has nothing to do with the source code version.

 */

struct bpf_version {

	u_short bv_major;

	u_short bv_minor;

};

/* Current version number of filter architecture. */

#define BPF_MAJOR_VERSION 1

#define BPF_MINOR_VERSION 1

/*

 * Data-link level type codes.

 *

 * Do *NOT* add new values to this list without asking

 * "tcpdump-workers@tcpdump.org" for a value.  Otherwise, you run the

 * risk of using a value that's already being used for some other purpose,

 * and of having tools that read libpcap-format captures not being able

 * to handle captures with your new DLT_ value, with no hope that they

 * will ever be changed to do so (as that would destroy their ability

 * to read captures using that value for that other purpose).

 */

/*

 * These are the types that are the same on all platforms, and that

 * have been defined by <net/bpf.h> for ages.

 */

#define DLT_NULL	0	/* BSD loopback encapsulation */

#define DLT_EN10MB	1	/* Ethernet (10Mb) */

#define DLT_EN3MB	2	/* Experimental Ethernet (3Mb) */

#define DLT_AX25	3	/* Amateur Radio AX.25 */

#define DLT_PRONET	4	/* Proteon ProNET Token Ring */

#define DLT_CHAOS	5	/* Chaos */

#define DLT_IEEE802	6	/* IEEE 802 Networks */

#define DLT_ARCNET	7	/* ARCNET, with BSD-style header */

#define DLT_SLIP	8	/* Serial Line IP */

#define DLT_PPP		9	/* Point-to-point Protocol */

#define DLT_FDDI	10	/* FDDI */

/*

 * These are types that are different on some platforms, and that

 * have been defined by <net/bpf.h> for ages.  We use #ifdefs to

 * detect the BSDs that define them differently from the traditional

 * libpcap <net/bpf.h>

 *

 * XXX - DLT_ATM_RFC1483 is 13 in BSD/OS, and DLT_RAW is 14 in BSD/OS,

 * but I don't know what the right #define is for BSD/OS.

 */

#define DLT_ATM_RFC1483	11	/* LLC-encapsulated ATM */

#ifdef __OpenBSD__

#define DLT_RAW		14	/* raw IP */

#else

#define DLT_RAW		12	/* raw IP */

#endif

/*

 * Given that the only OS that currently generates BSD/OS SLIP or PPP

 * is, well, BSD/OS, arguably everybody should have chosen its values

 * for DLT_SLIP_BSDOS and DLT_PPP_BSDOS, which are 15 and 16, but they

 * didn't.  So it goes.

 */

#if defined(__NetBSD__) || defined(__FreeBSD__)

#ifndef DLT_SLIP_BSDOS

#define DLT_SLIP_BSDOS	13	/* BSD/OS Serial Line IP */

#define DLT_PPP_BSDOS	14	/* BSD/OS Point-to-point Protocol */

#endif

#else

#define DLT_SLIP_BSDOS	15	/* BSD/OS Serial Line IP */

#define DLT_PPP_BSDOS	16	/* BSD/OS Point-to-point Protocol */

#endif

/*

 * 17 is used for DLT_OLD_PFLOG in OpenBSD;

 *     OBSOLETE: DLT_PFLOG is 117 in OpenBSD now as well. See below.

 * 18 is used for DLT_PFSYNC in OpenBSD; don't use it for anything else.

 */

#define DLT_ATM_CLIP	19	/* Linux Classical-IP over ATM */

/*

 * Apparently Redback uses this for its SmartEdge 400/800.  I hope

 * nobody else decided to use it, too.

 */

#define DLT_REDBACK_SMARTEDGE	32

/*

 * These values are defined by NetBSD; other platforms should refrain from

 * using them for other purposes, so that NetBSD savefiles with link

 * types of 50 or 51 can be read as this type on all platforms.

 */

#define DLT_PPP_SERIAL	50	/* PPP over serial with HDLC encapsulation */

#define DLT_PPP_ETHER	51	/* PPP over Ethernet */

/*

 * The Axent Raptor firewall - now the Symantec Enterprise Firewall - uses

 * a link-layer type of 99 for the tcpdump it supplies.  The link-layer

 * header has 6 bytes of unknown data, something that appears to be an

 * Ethernet type, and 36 bytes that appear to be 0 in at least one capture

 * I've seen.

 */

#define DLT_SYMANTEC_FIREWALL	99

/*

 * Values between 100 and 103 are used in capture file headers as

 * link-layer types corresponding to DLT_ types that differ

 * between platforms; don't use those values for new DLT_ new types.

 */

/*

 * This value was defined by libpcap 0.5; platforms that have defined

 * it with a different value should define it here with that value -

 * a link type of 104 in a save file will be mapped to DLT_C_HDLC,

 * whatever value that happens to be, so programs will correctly

 * handle files with that link type regardless of the value of

 * DLT_C_HDLC.

 *

 * The name DLT_C_HDLC was used by BSD/OS; we use that name for source

 * compatibility with programs written for BSD/OS.

 *

 * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,

 * for source compatibility with programs written for libpcap 0.5.

 */

#define DLT_C_HDLC	104	/* Cisco HDLC */

#define DLT_CHDLC	DLT_C_HDLC

#define DLT_IEEE802_11	105	/* IEEE 802.11 wireless */

/*

 * 106 is reserved for Linux Classical IP over ATM; it's like DLT_RAW,

 * except when it isn't.  (I.e., sometimes it's just raw IP, and

 * sometimes it isn't.)  We currently handle it as DLT_LINUX_SLL,

 * so that we don't have to worry about the link-layer header.)

 */

/*

 * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides

 * with other values.

 * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header

 * (DLCI, etc.).

 */

#define DLT_FRELAY	107

/*

 * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except

 * that the AF_ type in the link-layer header is in network byte order.

 *

 * OpenBSD defines it as 12, but that collides with DLT_RAW, so we

 * define it as 108 here.  If OpenBSD picks up this file, it should

 * define DLT_LOOP as 12 in its version, as per the comment above -

 * and should not use 108 as a DLT_ value.

 */

#define DLT_LOOP	108

/*

 * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's

 * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other

 * than OpenBSD.

 */

#ifdef __OpenBSD__

#define DLT_ENC		13

#else

#define DLT_ENC		109

#endif

/*

 * Values between 110 and 112 are reserved for use in capture file headers

 * as link-layer types corresponding to DLT_ types that might differ

 * between platforms; don't use those values for new DLT_ types

 * other than the corresponding DLT_ types.

 */

/*

 * This is for Linux cooked sockets.

 */

#define DLT_LINUX_SLL	113

/*

 * Apple LocalTalk hardware.

 */

#define DLT_LTALK	114

/*

 * Acorn Econet.

 */

#define DLT_ECONET	115

/*

 * Reserved for use with OpenBSD ipfilter.

 */

#define DLT_IPFILTER	116

/*

 * OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD, but that's DLT_LANE8023

 * in SuSE 6.3, so we can't use 17 for it in capture-file headers.

 *

 * XXX: is there a conflict with DLT_PFSYNC 18 as well?

 */

#ifdef __OpenBSD__

#define DLT_OLD_PFLOG	17

#define DLT_PFSYNC	18

#endif

#define DLT_PFLOG	117

/*

 * Registered for Cisco-internal use.

 */

#define DLT_CISCO_IOS	118

/*

 * For 802.11 cards using the Prism II chips, with a link-layer

 * header including Prism monitor mode information plus an 802.11

 * header.

 */

#define DLT_PRISM_HEADER	119

/*

 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header

 * (see Doug Ambrisko's FreeBSD patches).

 */

#define DLT_AIRONET_HEADER	120

/*

 * Reserved for Siemens HiPath HDLC.

 */

#define DLT_HHDLC		121

/*

 * This is for RFC 2625 IP-over-Fibre Channel.

 *

 * This is not for use with raw Fibre Channel, where the link-layer

 * header starts with a Fibre Channel frame header; it's for IP-over-FC,

 * where the link-layer header starts with an RFC 2625 Network_Header

 * field.

 */

#define DLT_IP_OVER_FC		122

/*

 * This is for Full Frontal ATM on Solaris with SunATM, with a

 * pseudo-header followed by an AALn PDU.

 *

 * There may be other forms of Full Frontal ATM on other OSes,

 * with different pseudo-headers.

 *

 * If ATM software returns a pseudo-header with VPI/VCI information

 * (and, ideally, packet type information, e.g. signalling, ILMI,

 * LANE, LLC-multiplexed traffic, etc.), it should not use

 * DLT_ATM_RFC1483, but should get a new DLT_ value, so tcpdump

 * and the like don't have to infer the presence or absence of a

 * pseudo-header and the form of the pseudo-header.

 */

#define DLT_SUNATM		123	/* Solaris+SunATM */

/* 

 * Reserved as per request from Kent Dahlgren <kent@praesum.com>

 * for private use.

 */

#define DLT_RIO                 124     /* RapidIO */

#define DLT_PCI_EXP             125     /* PCI Express */

#define DLT_AURORA              126     /* Xilinx Aurora link layer */

/*

 * Header for 802.11 plus a number of bits of link-layer information

 * including radio information, used by some recent BSD drivers as

 * well as the madwifi Atheros driver for Linux.

 */

#define DLT_IEEE802_11_RADIO	127	/* 802.11 plus radiotap radio header */

/*

 * Reserved for the TZSP encapsulation, as per request from

 * Chris Waters <chris.waters@networkchemistry.com>

 * TZSP is a generic encapsulation for any other link type,

 * which includes a means to include meta-information

 * with the packet, e.g. signal strength and channel

 * for 802.11 packets.

 */

#define DLT_TZSP                128     /* Tazmen Sniffer Protocol */

/*

 * BSD's ARCNET headers have the source host, destination host,

 * and type at the beginning of the packet; that's what's handed

 * up to userland via BPF.

 *

 * Linux's ARCNET headers, however, have a 2-byte offset field

 * between the host IDs and the type; that's what's handed up

 * to userland via PF_PACKET sockets.

 *

 * We therefore have to have separate DLT_ values for them.

 */

#define DLT_ARCNET_LINUX	129	/* ARCNET */

/*

 * Juniper-private data link types, 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_MLPPP       130

#define DLT_JUNIPER_MLFR        131

#define DLT_JUNIPER_ES          132

#define DLT_JUNIPER_GGSN        133

#define DLT_JUNIPER_MFR         134

#define DLT_JUNIPER_ATM2        135

#define DLT_JUNIPER_SERVICES    136

#define DLT_JUNIPER_ATM1        137

/*

 * Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund

 * <dieter@apple.com>.  The header that's presented is an Ethernet-like

 * header:

 *

 *	#define FIREWIRE_EUI64_LEN	8

 *	struct firewire_header {

 *		u_char  firewire_dhost[FIREWIRE_EUI64_LEN];

 *		u_char  firewire_shost[FIREWIRE_EUI64_LEN];

 *		u_short firewire_type;

 *	};

 *

 * with "firewire_type" being an Ethernet type value, rather than,

 * for example, raw GASP frames being handed up.

 */

#define DLT_APPLE_IP_OVER_IEEE1394	138

/*

 * Various SS7 encapsulations, as per a request from Jeff Morriss

 * <jeff.morriss[AT]ulticom.com> and subsequent discussions.

 */

#define DLT_MTP2_WITH_PHDR	139	/* pseudo-header with various info, followed by MTP2 */

#define DLT_MTP2		140	/* MTP2, without pseudo-header */

#define DLT_MTP3		141	/* MTP3, without pseudo-header or MTP2 */

#define DLT_SCCP		142	/* SCCP, without pseudo-header or MTP2 or MTP3 */

/*

 * DOCSIS MAC frames.

 */

#define DLT_DOCSIS		143

/*

 * Linux-IrDA packets. Protocol defined at http://www.irda.org.

 * Those packets include IrLAP headers and above (IrLMP...), but

 * don't include Phy framing (SOF/EOF/CRC & byte stuffing), because Phy

 * framing can be handled by the hardware and depend on the bitrate.

 * This is exactly the format you would get capturing on a Linux-IrDA

 * interface (irdaX), but not on a raw serial port.

 * Note the capture is done in "Linux-cooked" mode, so each packet include

 * a fake packet header (struct sll_header). This is because IrDA packet

 * decoding is dependant on the direction of the packet (incomming or

 * outgoing).

 * When/if other platform implement IrDA capture, we may revisit the

 * issue and define a real DLT_IRDA...

 * Jean II

 */

#define DLT_LINUX_IRDA		144

/*

 * Reserved for IBM SP switch and IBM Next Federation switch.

 */

#define DLT_IBM_SP		145

#define DLT_IBM_SN		146

/*

 * Reserved for private use.  If you have some link-layer header type

 * that you want to use within your organization, with the capture files

 * using that link-layer header type not ever be sent outside your

 * organization, you can use these values.

 *

 * No libpcap release will use these for any purpose, nor will any

 * tcpdump release use them, either.

 *

 * Do *NOT* use these in capture files that you expect anybody not using

 * your private versions of capture-file-reading tools to read; in

 * particular, do *NOT* use them in products, otherwise you may find that

 * people won't be able to use tcpdump, or snort, or Ethereal, or... to

 * 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

/*

 * Juniper-private data link type, as per request from

 * Hannes Gredler <hannes@juniper.net>. 

 * The DLT_ are used for prepending meta-information

 * like interface index, interface name

 * before standard Ethernet, PPP, Frelay & C-HDLC Frames

 */

#define DLT_JUNIPER_ETHER       178

#define DLT_JUNIPER_PPP         179

#define DLT_JUNIPER_FRELAY      180

#define DLT_JUNIPER_CHDLC       181

/*

 * Multi Link Frame Relay (FRF.16)

 */

#define DLT_MFR                 182

/*

 * Juniper-private data link type, as per request from

 * Hannes Gredler <hannes@juniper.net>. 

 * The DLT_ is used for internal communication with a

 * voice Adapter Card (PIC)

 */

#define DLT_JUNIPER_VP          183

/*

 * Arinc 429 frames.

 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.

 * Every frame contains a 32bit A429 label.

 * More documentation on Arinc 429 can be found at

 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf

 */

#define DLT_A429                184

/*

 * Arinc 653 Interpartition Communication messages.

 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.

 * Please refer to the A653-1 standard for more information.

 */

#define DLT_A653_ICM            185

/*

 * Controller Area Network (CAN) v. 2.0B packets.

 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.

 * Used to dump CAN packets coming from a CAN Vector board.

 * More documentation on the CAN v2.0B frames can be found at

 * http://www.can-cia.org/downloads/?269

 */

#define DLT_CAN20B              190

/*

 * 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