/*-

 * 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. 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

 */

/*

 * 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.

 *

 * At least two programs found by Google Code Search explicitly includes

 * <pcap/bpf.h> (even though <pcap.h>/<pcap/pcap.h> includes it for you),

 * so moving that stuff to <pcap/pcap.h> would break the build for some

 * programs.

 */

/*

 * If we've already included <net/bpf.h>, don't re-define this stuff.

 * We assume BSD-style multiple-include protection in <net/bpf.h>,

 * which is true of all but the oldest versions of FreeBSD and NetBSD,

 * or Tru64 UNIX-style multiple-include protection (or, at least,

 * Tru64 UNIX 5.x-style; I don't have earlier versions available to check),

 * or AIX-style multiple-include protection (or, at least, AIX 5.x-style;

 * I don't have earlier versions available to check), or QNX-style

 * multiple-include protection (as per GitHub pull request #394).

 *

 * We do not check for BPF_MAJOR_VERSION, as that's defined by

 * <linux/filter.h>, which is directly or indirectly included in some

 * programs that also include pcap.h, and <linux/filter.h> doesn't

 * define stuff we need.

 *

 * This also provides our own multiple-include protection.

 */

#if !defined(_NET_BPF_H_) && !defined(_NET_BPF_H_INCLUDED) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h)

#define lib_pcap_bpf_h

#include <pcap/funcattrs.h>

#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.

 *

 * Tcpdump's print-pflog.c uses this, so we define it here.

 */

#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))

/*

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

 */

struct bpf_program {

	u_int bf_len;

	struct bpf_insn *bf_insns;

};

#include <pcap/dlt.h>

/*

 * The instruction encodings.

 *

 * Please inform tcpdump-workers@lists.tcpdump.org if you use any

 * of the reserved values, so that we can note that they're used

 * (and perhaps implement it in the reference BPF implementation

 * and encourage its implementation elsewhere).

 */

/*

 * The upper 8 bits of the opcode aren't used. BSD/OS used 0x8000.

 */

/* 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

/*				0x18	reserved; used by BSD/OS */

#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

/*				0xc0	reserved; used by BSD/OS */

/*				0xe0	reserved; used by BSD/OS */

/* 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_MOD		0x90

#define		BPF_XOR		0xa0

/*				0xb0	reserved */

/*				0xc0	reserved */

/*				0xd0	reserved */

/*				0xe0	reserved */

/*				0xf0	reserved */

#define		BPF_JA		0x00

#define		BPF_JEQ		0x10

#define		BPF_JGT		0x20

#define		BPF_JGE		0x30

#define		BPF_JSET	0x40

/*				0x50	reserved; used on BSD/OS */

/*				0x60	reserved */

/*				0x70	reserved */

/*				0x80	reserved */

/*				0x90	reserved */

/*				0xa0	reserved */

/*				0xb0	reserved */

/*				0xc0	reserved */

/*				0xd0	reserved */

/*				0xe0	reserved */

/*				0xf0	reserved */

#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

/*				0x18	reserved */

/* misc */

#define BPF_MISCOP(code) ((code) & 0xf8)

#define		BPF_TAX		0x00

/*				0x08	reserved */

/*				0x10	reserved */

/*				0x18	reserved */

/* #define	BPF_COP		0x20	NetBSD "coprocessor" extensions */

/*				0x28	reserved */

/*				0x30	reserved */

/*				0x38	reserved */

/* #define	BPF_COPX	0x40	NetBSD "coprocessor" extensions */

/*					also used on BSD/OS */

/*				0x48	reserved */

/*				0x50	reserved */

/*				0x58	reserved */

/*				0x60	reserved */

/*				0x68	reserved */

/*				0x70	reserved */

/*				0x78	reserved */

#define		BPF_TXA		0x80

/*				0x88	reserved */

/*				0x90	reserved */

/*				0x98	reserved */

/*				0xa0	reserved */

/*				0xa8	reserved */

/*				0xb0	reserved */

/*				0xb8	reserved */

/*				0xc0	reserved; used on BSD/OS */

/*				0xc8	reserved */

/*				0xd0	reserved */

/*				0xd8	reserved */

/*				0xe0	reserved */

/*				0xe8	reserved */

/*				0xf0	reserved */

/*				0xf8	reserved */

/*

 * The instruction data structure.

 */

struct bpf_insn {

	u_short	code;

	u_char 	jt;

	u_char 	jf;

	bpf_u_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 }

PCAP_API int bpf_validate(const struct bpf_insn *, int);

PCAP_API u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);

/*

 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).

 */

#define BPF_MEMWORDS 16

#ifdef __cplusplus

}

#endif

#endif /* !defined(_NET_BPF_H_) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h) */