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//==========================================================================

//

//      include/net/bpf.h

//

//==========================================================================

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// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 2003 Free Software Foundation, Inc.                        

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//==========================================================================

/*

 * Copyright (c) 1990, 1991, 1993

 *      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       8.1 (Berkeley) 6/10/93

 *      @(#)bpf.h       1.34 (LBL)     6/16/96

 *

 * $FreeBSD: src/sys/net/bpf.h,v 1.21.2.3 2001/08/01 00:23:13 fenner Exp $

 */

#ifndef _NET_BPF_H_

#define _NET_BPF_H_

/* BSD style release date */

#define BPF_RELEASE 199606

typedef int32_t   bpf_int32;

typedef u_int32_t bpf_u_int32;

/*

 * Alignment macros.  BPF_WORDALIGN rounds up to the next

 * even multiple of BPF_ALIGNMENT.

 */

#define BPF_ALIGNMENT sizeof(long)

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

#define BPF_MAXINSNS 512

#define BPF_MAXBUFSIZE 0x80000

#define BPF_MINBUFSIZE 32

/*

 *  Structure for BIOCSETF.

 */

struct bpf_program {

        u_int bf_len;

        struct bpf_insn *bf_insns;

};

/*

 * Struct returned by BIOCGSTATS.

 */

struct bpf_stat {

        u_int bs_recv;          /* number of packets received */

        u_int bs_drop;          /* number of packets dropped */

};

/*

 * 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

#define BIOCGBLEN       _IOR('B',102, u_int)

#define BIOCSBLEN       _IOWR('B',102, u_int)

#define BIOCSETF        _IOW('B',103, struct bpf_program)

#define BIOCFLUSH       _IO('B',104)

#define BIOCPROMISC     _IO('B',105)

#define BIOCGDLT        _IOR('B',106, u_int)

#define BIOCGETIF       _IOR('B',107, struct ifreq)

#define BIOCSETIF       _IOW('B',108, struct ifreq)

#define BIOCSRTIMEOUT   _IOW('B',109, struct timeval)

#define BIOCGRTIMEOUT   _IOR('B',110, struct timeval)

#define BIOCGSTATS      _IOR('B',111, struct bpf_stat)

#define BIOCIMMEDIATE   _IOW('B',112, u_int)

#define BIOCVERSION     _IOR('B',113, struct bpf_version)

#define BIOCGRSIG       _IOR('B',114, u_int)

#define BIOCSRSIG       _IOW('B',115, u_int)

#define BIOCGHDRCMPLT   _IOR('B',116, u_int)

#define BIOCSHDRCMPLT   _IOW('B',117, u_int)

#define BIOCGSEESENT    _IOR('B',118, u_int)

#define BIOCSSEESENT    _IOW('B',119, u_int)

/*

 * 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) */

};

/*

 * Because the structure above is not a multiple of 4 bytes, some compilers

 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.

 * Only the kernel needs to know about it; applications use bh_hdrlen.

 */

#ifdef _KERNEL

#define SIZEOF_BPF_HDR  (sizeof(struct bpf_hdr) <= 20 ? 18 : \

    sizeof(struct bpf_hdr))

#endif

/*

 * Data-link level type codes.

 */

#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 */

#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

/*

 * 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 }

#ifdef _KERNEL

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

void     bpf_tap __P((struct ifnet *, u_char *, u_int));

void     bpf_mtap __P((struct ifnet *, struct mbuf *));

void     bpfattach __P((struct ifnet *, u_int, u_int));

void     bpfdetach __P((struct ifnet *));

void     bpfilterattach __P((int));

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

#endif

/*

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

 */

#define BPF_MEMWORDS 16

#endif