/*-
 * 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: /usr/cvsroot_private/winpcap/packetNtx/driver/win_bpf.h,v 1.2.2.1 2005/12/02 22:12:58 gianlucav Exp $ (LBL)
 */

#ifndef BPF_MAJOR_VERSION

/* BSD style release date */
#define BPF_RELEASE 199606

#ifdef WIN_NT_DRIVER
#include <ndis.h>
#endif


#include "tme.h"
#include "time_calls.h"

typedef	UCHAR u_char;
typedef	USHORT u_short;

#ifdef WIN_NT_DRIVER
typedef	ULONG u_int;
#endif

typedef	LONG bpf_int32;
typedef	ULONG bpf_u_int32;
typedef	ULONG u_int32;

#define BPF_MAXINSNS 512
#define BPF_MAXBUFSIZE 0x8000
#define BPF_MINBUFSIZE 32

/*
 * The instruction data structure.
 */
struct bpf_insn {
	u_short	code;
	u_char 	jt;
	u_char 	jf;
	bpf_u_int32 k;
};

/*
 *  Structure for BIOCSETF.
 */
struct bpf_program {
	u_int bf_len;
	struct bpf_insn *bf_insns;
};
 
/*
 * Struct returned by BIOCGSTATS.
 */
struct bpf_stat {
	UINT bs_recv;		///< Number of packets that the driver received from the network adapter 
						///< from the beginning of the current capture. This value includes the packets 
						///< lost by the driver.
	UINT bs_drop;		///< number of packets that the driver lost from the beginning of a capture. 
						///< Basically, a packet is lost when the the buffer of the driver is full. 
						///< In this situation the packet cannot be stored and the driver rejects it.
	UINT ps_ifdrop;		///< drops by interface. XXX not yet supported
	UINT bs_capt;		///< number of packets that pass the filter, find place in the kernel buffer and
						///< thus reach the application.
};

/*
 * 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


/*
 * Structure prepended to each packet.
 */
struct bpf_hdr {
	struct timeval	bh_tstamp;	/* time stamp */
	bpf_u_int32	bh_caplen;	/* length of captured portion */
	bpf_u_int32	bh_datalen;	/* original length of packet */
	u_short		bh_hdrlen;	/* length of bpf header (this struct
					   plus alignment padding) */
};

/*
 * Data-link level type codes.
 */

/*
 * These are the types that are the same on all platforms; on other
 * platforms, a <net/bpf.h> should be supplied that defines the additional
 * DLT_* codes appropriately for that platform (the BSDs, for example,
 * should not just pick up this version of "bpf.h"; they should also define
 * the additional DLT_* codes used by their kernels, as well as the values
 * defined here - and, if the values they use for particular DLT_ types
 * differ from those here, they should use their values, not the ones
 * here).
 */
#define DLT_NULL	0	/* no link-layer 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 */
#define DLT_SLIP	8	/* Serial Line IP */
#define DLT_PPP		9	/* Point-to-point Protocol */
#define DLT_FDDI	10	/* FDDI */

/*
 * These are values from the traditional libpcap "bpf.h".
 * Ports of this to particular platforms should replace these definitions
 * with the ones appropriate to that platform, if the values are
 * different on that platform.
 */
#define DLT_ATM_RFC1483	11	/* LLC/SNAP encapsulated atm */
#define DLT_RAW		12	/* raw IP */

/*
 * These are values from BSD/OS's "bpf.h".
 * These are not the same as the values from the traditional libpcap
 * "bpf.h"; however, these values shouldn't be generated by any
 * OS other than BSD/OS, so the correct values to use here are the
 * BSD/OS values.
 *
 * Platforms that have already assigned these values to other
 * DLT_ codes, however, should give these codes the values
 * from that platform, so that programs that use these codes will
 * continue to compile - even though they won't correctly read
 * files of these types.
 */
#define DLT_SLIP_BSDOS	15	/* BSD/OS Serial Line IP */
#define DLT_PPP_BSDOS	16	/* BSD/OS Point-to-point Protocol */

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

/*
 * This value is defined by NetBSD; other platforms should refrain from
 * using it for other purposes, so that NetBSD savefiles with a link
 * type of 50 can be read as this type on all platforms.
 */
#define DLT_PPP_SERIAL	50	/* PPP over serial with HDLC encapsulation */

/*
 * 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

/*
 * Reserved for future use.
 * Do not pick other numerical value for these unless you have also
 * picked up the tcpdump.org top-of-CVS-tree version of "savefile.c",
 * which will arrange that capture files for these DLT_ types have
 * the same "network" value on all platforms, regardless of what
 * value is chosen for their DLT_ type (thus allowing captures made
 * on one platform to be read on other platforms, even if the two
 * platforms don't use the same numerical values for all DLT_ types).
 */
#define DLT_IEEE802_11	105	/* IEEE 802.11 wireless */

/*
 * Values between 106 and 107 are used 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_ new types.
 */

/*
 * 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 for any purpose.
 */
#define DLT_LOOP	108

/*
 * Values between 109 and 112 are used 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_ new types.
 */

/*
 * This is for Linux cooked sockets.
 */
#define DLT_LINUX_SLL	113

/*
 * 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

/* TME instructions */
#define		BPF_TME					0x08

#define		BPF_LOOKUP				0x90   
#define		BPF_EXECUTE				0xa0
#define		BPF_INIT				0xb0
#define		BPF_VALIDATE			0xc0
#define		BPF_SET_ACTIVE			0xd0
#define		BPF_RESET				0xe0
#define		BPF_SET_MEMORY			0x80
#define		BPF_GET_REGISTER_VALUE	0x70
#define		BPF_SET_REGISTER_VALUE	0x60
#define		BPF_SET_WORKING			0x50
#define		BPF_SET_ACTIVE_READ		0x40
#define		BPF_SET_AUTODELETION	0x30
#define		BPF_SEPARATION			0xff

#define		BPF_MEM_EX_IMM	0xc0
#define		BPF_MEM_EX_IND	0xe0
/*used for ST */
#define		BPF_MEM_EX		0xc0


/*
 * 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 }

/*
 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
 */
#define BPF_MEMWORDS 16

#ifdef __cplusplus
extern "C"
{
#endif

/*!
  \brief Validates a filtering program arriving from the user-level app.
  \param f The filter.
  \param len Its length, in pseudo instructions.
  \param mem_ex_size The length of the extended memory, used to validate LD/ST to that memory
  \return true if f is a valid filter program..
  
  The kernel needs to be able to verify an application's filter code. Otherwise, a bogus program could easily 
  crash the system.
  This function returns true if f is a valid filter program. The constraints are that each jump be forward and 
  to a valid code.  The code must terminate with either an accept or reject. 
*/
int32 bpf_validate(struct bpf_insn *f,int32 len, uint32 mem_ex_size);

/*!
  \brief The filtering pseudo-machine interpreter.
  \param pc The filter.
  \param p Pointer to a memory buffer containing the packet on which the filter will be executed.
  \param wirelen Original length of the packet.
  \param buflen Current length of the packet. In some cases (for example when the transfer of the packet to the RAM
  has not yet finished), bpf_filter can be executed on a portion of the packet.
  \param mem_ex The extended memory.
  \param tme The virtualization of the TME co-processor
  \param time_ref Data structure needed by the TME co-processor to timestamp data
  \return The portion of the packet to keep, in bytes. 0 means that the packet must be rejected, -1 means that
   the whole packet must be kept.
  
  \note this function is not used in normal situations, because the jitter creates a native filtering function
  that is faster than the interpreter.
*/
u_int bpf_filter(register struct bpf_insn *pc,
				register UCHAR *p,
				u_int wirelen,
				register u_int buflen ,
				PMEM_TYPE mem_ex,
				PTME_CORE tme ,
				struct time_conv *time_ref);

/*!
  \brief The filtering pseudo-machine interpreter with two buffers. This function is slower than bpf_filter(), 
  but works correctly also if the MAC header and the data of the packet are in two different buffers.
  \param pc The filter.
  \param p Pointer to a memory buffer containing the MAC header of the packet.
  \param pd Pointer to a memory buffer containing the data of the packet.
  \param wirelen Original length of the packet.
  \param buflen Current length of the packet. In some cases (for example when the transfer of the packet to the RAM
  has not yet finished), bpf_filter can be executed on a portion of the packet.
  \param mem_ex The extended memory.
  \param tme The virtualization of the TME co-processor
  \param time_ref Data structure needed by the TME co-processor to timestamp data
  \return The portion of the packet to keep, in bytes. 0 means that the packet must be rejected, -1 means that
   the whole packet must be kept.
  
  This function is used when NDIS passes the packet to NPF_tap() in two buffers instaed than in a single one.
*/
u_int bpf_filter_with_2_buffers(register struct bpf_insn *pc,
							   register u_char *p,
							   register u_char *pd,
							   register int headersize,
							   u_int wirelen,
							   register u_int buflen,
							   PMEM_TYPE mem_ex,
				               PTME_CORE tme,
							   struct time_conv *time_ref);

#ifdef __cplusplus
}
#endif


#endif
