[apple/xnu.git] / bsd / net / bpf.h

/*
 * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * 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. 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       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 $
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

#ifndef _NET_BPF_H_
#define _NET_BPF_H_
#include <sys/param.h>
#include <sys/appleapiopts.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/cdefs.h>
#include <stdint.h>

#ifdef KERNEL
#include <sys/kernel_types.h>
#endif

/* 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(int32_t)
#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;
};

#ifdef KERNEL_PRIVATE
/* LP64 version of bpf_program.  all pointers 
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with bpf_program
 */
struct bpf_program64 {
        u_int           bf_len;
        user64_addr_t   bf_insns __attribute__((aligned(8)));
};

struct bpf_program32 {
        u_int           bf_len;
        user32_addr_t   bf_insns;
};
#endif /* KERNEL_PRIVATE */

/*
 * 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;
};
#if defined(__LP64__)
#include <sys/_types/_timeval32.h>

#define BPF_TIMEVAL timeval32
#else
#define BPF_TIMEVAL timeval
#endif /* __LP64__ */
/* 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)
#ifdef KERNEL_PRIVATE
#define BIOCSETF64      _IOW('B',103, struct bpf_program64)
#define BIOCSETF32      _IOW('B',103, struct bpf_program32)
#endif /* KERNEL_PRIVATE */
#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)
#ifdef KERNEL_PRIVATE
#define BIOCSRTIMEOUT64 _IOW('B',109, struct user64_timeval)
#define BIOCSRTIMEOUT32 _IOW('B',109, struct user32_timeval)
#endif /* KERNEL_PRIVATE */
#define BIOCGRTIMEOUT   _IOR('B',110, struct timeval)
#ifdef KERNEL_PRIVATE
#define BIOCGRTIMEOUT64 _IOR('B',110, struct user64_timeval)
#define BIOCGRTIMEOUT32 _IOR('B',110, struct user32_timeval)
#endif /* KERNEL_PRIVATE */
#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)
#define BIOCSDLT        _IOW('B',120, u_int)
#define BIOCGDLTLIST    _IOWR('B',121, struct bpf_dltlist)
#ifdef PRIVATE
#define BIOCGETTC       _IOR('B', 122, int)
#define BIOCSETTC       _IOW('B', 123, int)
#define BIOCSEXTHDR     _IOW('B', 124, u_int)
#define BIOCGIFATTACHCOUNT      _IOWR('B', 125, struct ifreq)
#endif /* PRIVATE */
#define BIOCSETFNR      _IOW('B', 126, struct bpf_program)
#ifdef KERNEL_PRIVATE
#define BIOCSETFNR64    _IOW('B',126, struct bpf_program64)
#define BIOCSETFNR32    _IOW('B',126, struct bpf_program32)
#endif /* KERNEL_PRIVATE */

/*
 * Structure prepended to each packet.
 */
struct bpf_hdr {
        struct BPF_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) */
};
#ifdef KERNEL
/*
 * 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.
 */
#define SIZEOF_BPF_HDR  (sizeof(struct bpf_hdr) <= 20 ? 18 : \
    sizeof(struct bpf_hdr))
#endif
#ifdef PRIVATE
/*
 * This structure must be a multiple of 4 bytes.
 * It includes padding and spare fields that we can use later if desired.
 */
struct bpf_hdr_ext {
        struct BPF_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 */
        u_short         bh_flags;
#define BPF_HDR_EXT_FLAGS_DIR_IN        0x0000
#define BPF_HDR_EXT_FLAGS_DIR_OUT       0x0001
        pid_t           bh_pid;         /* process PID */
        char            bh_comm[MAXCOMLEN+1]; /* process command */
        u_char          _bh_pad2[2];
        u_char          bh_proto;       /* kernel reserved; 0 in userland */
        bpf_u_int32     bh_svc;         /* service class */
        bpf_u_int32     bh_flowid;      /* kernel reserved; 0 in userland */
};

#define BPF_CONTROL_NAME        "com.apple.net.bpf"

struct bpf_mtag {
        char            bt_comm[MAXCOMLEN];
        pid_t           bt_pid;
        bpf_u_int32     bt_svc;
        unsigned char   bt_direction;
#define BPF_MTAG_DIR_IN         0
#define BPF_MTAG_DIR_OUT        1
};
#endif /* PRIVATE */

/*
 * 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 */

/*
 * 17 was used for DLT_PFLOG in OpenBSD; it no longer is.
 *
 * It was DLT_LANE8023 in SuSE 6.3, so we defined LINKTYPE_PFLOG
 * as 117 so that pflog captures would use a link-layer header type
 * value that didn't collide with any other values.  On all
 * platforms other than OpenBSD, we defined DLT_PFLOG as 117,
 * and we mapped between LINKTYPE_PFLOG and DLT_PFLOG.
 *
 * OpenBSD eventually switched to using 117 for DLT_PFLOG as well.
 *
 * Don't use 17 for anything else.
 */

/*
 * 18 is used for DLT_PFSYNC in OpenBSD, NetBSD, DragonFly BSD and
 * Mac OS X; don't use it for anything else.  (FreeBSD uses 121,
 * which collides with DLT_HHDLC, even though it doesn't use 18
 * for anything and doesn't appear to have ever used it for anything.)
 *
 * We define it as 18 on those platforms; it is, unfortunately, used
 * for DLT_CIP in Suse 6.3, so we don't define it as DLT_PFSYNC
 * in general.  As the packet format for it, like that for
 * DLT_PFLOG, is not only OS-dependent but OS-version-dependent,
 * we don't support printing it in tcpdump except on OSes that
 * have the relevant header files, so it's not that useful on
 * other platforms.
 */
#define DLT_PFSYNC      18      /* Packet filter state syncing */

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

/*
 * 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 header type LINKTYPE_ values corresponding to DLT_ types
 * that differ between platforms; don't use those values for new DLT_
 * new types.
 */

/*
 * Values starting with 104 are used for newly-assigned link-layer
 * header type values; for those link-layer header types, the DLT_
 * value returned by pcap_datalink() and passed to pcap_open_dead(),
 * and the LINKTYPE_ value that appears in capture files, are the
 * same.
 *
 * DLT_MATCHING_MIN is the lowest such value; DLT_MATCHING_MAX is
 * the highest such value.
 */
#define DLT_MATCHING_MIN        104

/*
 * 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 */

/*
 * 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.
 */

/*
 * 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 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.
 */

/*
 * 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.
 */
#define DLT_ENC 109

/*
 * 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

/*
 * For use in capture-file headers as a link-layer type corresponding
 * to OpenBSD PF (Packet Filter) log.
 */
#define DLT_PFLOG       117

/*
 * Registered for Cisco-internal use.
 */
#define DLT_CISCO_IOS   118

/*
 * Reserved 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. XXX
 */
#define DLT_HHDLC       121

/*
 * Reserved for RFC 2625 IP-over-Fibre Channel.
 */
#define DLT_IP_OVER_FC  122

/*
 * Reserved for Full Frontal ATM on Solaris.
 */
#define DLT_SUNATM      123

/*
 * 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 */

/*
 * BSD header for 802.11 plus a number of bits of link-layer information
 * including radio information.
 */
#ifndef DLT_IEEE802_11_RADIO
#define DLT_IEEE802_11_RADIO    127
#endif

/*
 * Reserved for TZSP encapsulation.
 */
#define DLT_TZSP                128     /* Tazmen Sniffer Protocol */

/*
 * Reserved for Linux ARCNET.
 */
#define DLT_ARCNET_LINUX        129

/*
 * Juniper-private data link types.
 */
#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 */

/*
 * Reserved for DOCSIS.
 */
#define DLT_DOCSIS      143

/*
 * Reserved for Linux IrDA.
 */
#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

#ifdef PRIVATE
/*
 * For Apple private usage
 */
#define DLT_PKTAP                       DLT_USER2       /* rdar://11779467 */
#endif /* PRIVATE */

/*
 * 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

/*
 * USB packets, beginning with a USB setup header; requested by
 * Paolo Abeni <paolo.abeni@email.it>.
 */
#define DLT_USB                 186

/*
 * Bluetooth HCI UART transport layer (part H:4); requested by
 * Paolo Abeni.
 */
#define DLT_BLUETOOTH_HCI_H4    187

/*
 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
 * <cruz_petagay@bah.com>.
 */
#define DLT_IEEE802_16_MAC_CPS  188

/*
 * USB packets, beginning with a Linux USB header; requested by
 * Paolo Abeni <paolo.abeni@email.it>.
 */
#define DLT_USB_LINUX           189

/*
 * 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

/*
 * IEEE 802.15.4, with address fields padded, as is done by Linux
 * drivers; requested by Juergen Schimmer.
 */
#define DLT_IEEE802_15_4_LINUX  191

/*
 * Per Packet Information encapsulated packets.
 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
 */
#define DLT_PPI                 192

/*
 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
 * requested by Charles Clancy.
 */
#define DLT_IEEE802_16_MAC_CPS_RADIO    193

/*
 * Juniper-private data link type, as per request from
 * Hannes Gredler <hannes@juniper.net>.
 * The DLT_ is used for internal communication with a
 * integrated service module (ISM).
 */
#define DLT_JUNIPER_ISM         194

/*
 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
 */
#define DLT_IEEE802_15_4        195

/*
 * Various link-layer types, with a pseudo-header, for SITA
 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
 */
#define DLT_SITA                196

/*
 * Various link-layer types, with a pseudo-header, for Endace DAG cards;
 * encapsulates Endace ERF records.  Requested by Stephen Donnelly
 * <stephen@endace.com>.
 */
#define DLT_ERF                 197

/*
 * Special header prepended to Ethernet packets when capturing from a
 * u10 Networks board.  Requested by Phil Mulholland
 * <phil@u10networks.com>.
 */
#define DLT_RAIF1               198

/*
 * IPMB packet for IPMI, beginning with the I2C slave address, followed
 * by the netFn and LUN, etc..  Requested by Chanthy Toeung
 * <chanthy.toeung@ca.kontron.com>.
 */
#define DLT_IPMB                199

/*
 * Juniper-private data link type, as per request from
 * Hannes Gredler <hannes@juniper.net>.
 * The DLT_ is used for capturing data on a secure tunnel interface.
 */
#define DLT_JUNIPER_ST          200

/*
 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
 * that includes direction information; requested by Paolo Abeni.
 */
#define DLT_BLUETOOTH_HCI_H4_WITH_PHDR  201

/*
 * AX.25 packet with a 1-byte KISS header; see
 *
 *      http://www.ax25.net/kiss.htm
 *
 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
 */
#define DLT_AX25_KISS           202

/*
 * LAPD packets from an ISDN channel, starting with the address field,
 * with no pseudo-header.
 * Requested by Varuna De Silva <varunax@gmail.com>.
 */
#define DLT_LAPD                203

/*
 * Variants of various link-layer headers, with a one-byte direction
 * pseudo-header prepended - zero means "received by this host",
 * non-zero (any non-zero value) means "sent by this host" - as per
 * Will Barker <w.barker@zen.co.uk>.
 */
#define DLT_PPP_WITH_DIR        204     /* PPP - don't confuse with DLT_PPP_WITH_DIRECTION */
#define DLT_C_HDLC_WITH_DIR     205     /* Cisco HDLC */
#define DLT_FRELAY_WITH_DIR     206     /* Frame Relay */
#define DLT_LAPB_WITH_DIR       207     /* LAPB */

/*
 * 208 is reserved for an as-yet-unspecified proprietary link-layer
 * type, as requested by Will Barker.
 */

/*
 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
 * <avn@pigeonpoint.com>.
 */
#define DLT_IPMB_LINUX          209

/*
 * FlexRay automotive bus - http://www.flexray.com/ - as requested
 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define DLT_FLEXRAY             210

/*
 * Media Oriented Systems Transport (MOST) bus for multimedia
 * transport - http://www.mostcooperation.com/ - as requested
 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define DLT_MOST                211

/*
 * Local Interconnect Network (LIN) bus for vehicle networks -
 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
 * <hannes.kaelber@x2e.de>.
 */
#define DLT_LIN                 212

/*
 * X2E-private data link type used for serial line capture,
 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define DLT_X2E_SERIAL          213

/*
 * X2E-private data link type used for the Xoraya data logger
 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define DLT_X2E_XORAYA          214

/*
 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
 * of 0 as preamble, one octet of SFD, one octet of frame length+
 * reserved bit, and then the MAC-layer data, starting with the
 * frame control field).
 *
 * Requested by Max Filippov <jcmvbkbc@gmail.com>.
 */
#define DLT_IEEE802_15_4_NONASK_PHY     215

/* 
 * David Gibson <david@gibson.dropbear.id.au> requested this for
 * captures from the Linux kernel /dev/input/eventN devices. This
 * is used to communicate keystrokes and mouse movements from the
 * Linux kernel to display systems, such as Xorg. 
 */
#define DLT_LINUX_EVDEV         216

/*
 * GSM Um and Abis interfaces, preceded by a "gsmtap" header.
 *
 * Requested by Harald Welte <laforge@gnumonks.org>.
 */
#define DLT_GSMTAP_UM           217
#define DLT_GSMTAP_ABIS         218

/*
 * MPLS, with an MPLS label as the link-layer header.
 * Requested by Michele Marchetto <michele@openbsd.org> on behalf
 * of OpenBSD.
 */
#define DLT_MPLS                219

/*
 * USB packets, beginning with a Linux USB header, with the USB header
 * padded to 64 bytes; required for memory-mapped access.
 */
#define DLT_USB_LINUX_MMAPPED   220

/*
 * DECT packets, with a pseudo-header; requested by
 * Matthias Wenzel <tcpdump@mazzoo.de>.
 */
#define DLT_DECT                221

/*
 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
 * Date: Mon, 11 May 2009 11:18:30 -0500
 *
 * DLT_AOS. We need it for AOS Space Data Link Protocol.
 *   I have already written dissectors for but need an OK from
 *   legal before I can submit a patch.
 *
 */
#define DLT_AOS                 222

/*
 * Wireless HART (Highway Addressable Remote Transducer)
 * From the HART Communication Foundation
 * IES/PAS 62591
 *
 * Requested by Sam Roberts <vieuxtech@gmail.com>.
 */
#define DLT_WIHART              223

/*
 * Fibre Channel FC-2 frames, beginning with a Frame_Header.
 * Requested by Kahou Lei <kahou82@gmail.com>.
 */
#define DLT_FC_2                224

/*
 * Fibre Channel FC-2 frames, beginning with an encoding of the
 * SOF, and ending with an encoding of the EOF.
 *
 * The encodings represent the frame delimiters as 4-byte sequences
 * representing the corresponding ordered sets, with K28.5
 * represented as 0xBC, and the D symbols as the corresponding
 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
 * is represented as 0xBC 0xB5 0x55 0x55.
 *
 * Requested by Kahou Lei <kahou82@gmail.com>.
 */
#define DLT_FC_2_WITH_FRAME_DELIMS      225

/*
 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
 *
 * The pseudo-header starts with a one-byte version number; for version 2,
 * the pseudo-header is:
 *
 * struct dl_ipnetinfo {
 *     u_int8_t   dli_version;
 *     u_int8_t   dli_family;
 *     u_int16_t  dli_htype;
 *     u_int32_t  dli_pktlen;
 *     u_int32_t  dli_ifindex;
 *     u_int32_t  dli_grifindex;
 *     u_int32_t  dli_zsrc;
 *     u_int32_t  dli_zdst;
 * };
 *
 * dli_version is 2 for the current version of the pseudo-header.
 *
 * dli_family is a Solaris address family value, so it's 2 for IPv4
 * and 26 for IPv6.
 *
 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
 * packets, and 2 for packets arriving from another zone on the same
 * machine.
 *
 * dli_pktlen is the length of the packet data following the pseudo-header
 * (so the captured length minus dli_pktlen is the length of the
 * pseudo-header, assuming the entire pseudo-header was captured).
 *
 * dli_ifindex is the interface index of the interface on which the
 * packet arrived.
 *
 * dli_grifindex is the group interface index number (for IPMP interfaces).
 *
 * dli_zsrc is the zone identifier for the source of the packet.
 *
 * dli_zdst is the zone identifier for the destination of the packet.
 *
 * A zone number of 0 is the global zone; a zone number of 0xffffffff
 * means that the packet arrived from another host on the network, not
 * from another zone on the same machine.
 *
 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
 * which of those it is.
 */
#define DLT_IPNET               226

/*
 * CAN (Controller Area Network) frames, with a pseudo-header as supplied
 * by Linux SocketCAN.  See Documentation/networking/can.txt in the Linux
 * source.
 *
 * Requested by Felix Obenhuber <felix@obenhuber.de>.
 */
#define DLT_CAN_SOCKETCAN       227

/*
 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
 * whether it's v4 or v6.  Requested by Darren Reed <Darren.Reed@Sun.COM>.
 */
#define DLT_IPV4                228
#define DLT_IPV6                229

/*
 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
 * nothing), and with no FCS at the end of the frame; requested by
 * Jon Smirl <jonsmirl@gmail.com>.
 */
#define DLT_IEEE802_15_4_NOFCS  230

/*
 * Raw D-Bus:
 *
 *      http://www.freedesktop.org/wiki/Software/dbus
 *
 * messages:
 *
 *      http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
 *
 * starting with the endianness flag, followed by the message type, etc.,
 * but without the authentication handshake before the message sequence:
 *
 *      http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
 *
 * Requested by Martin Vidner <martin@vidner.net>.
 */
#define DLT_DBUS                231

/*
 * Juniper-private data link type, as per request from
 * Hannes Gredler <hannes@juniper.net>.
 */
#define DLT_JUNIPER_VS                  232
#define DLT_JUNIPER_SRX_E2E             233
#define DLT_JUNIPER_FIBRECHANNEL        234

/*
 * DVB-CI (DVB Common Interface for communication between a PC Card
 * module and a DVB receiver).  See
 *
 *      http://www.kaiser.cx/pcap-dvbci.html
 *
 * for the specification.
 *
 * Requested by Martin Kaiser <martin@kaiser.cx>.
 */
#define DLT_DVB_CI              235

/*
 * Variant of 3GPP TS 27.010 multiplexing protocol (similar to, but
 * *not* the same as, 27.010).  Requested by Hans-Christoph Schemmel
 * <hans-christoph.schemmel@cinterion.com>.
 */
#define DLT_MUX27010            236

/*
 * STANAG 5066 D_PDUs.  Requested by M. Baris Demiray
 * <barisdemiray@gmail.com>.
 */
#define DLT_STANAG_5066_D_PDU   237

/*
 * Juniper-private data link type, as per request from
 * Hannes Gredler <hannes@juniper.net>.
 */
#define DLT_JUNIPER_ATM_CEMIC   238

/*
 * NetFilter LOG messages 
 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
 *
 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl>
 */
#define DLT_NFLOG               239

/*
 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
 * for Ethernet packets with a 4-byte pseudo-header and always
 * with the payload including the FCS, as supplied by their
 * netANALYZER hardware and software.
 *
 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
 */
#define DLT_NETANALYZER         240

/*
 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
 * for Ethernet packets with a 4-byte pseudo-header and FCS and
 * with the Ethernet header preceded by 7 bytes of preamble and
 * 1 byte of SFD, as supplied by their netANALYZER hardware and
 * software.
 *
 * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
 */
#define DLT_NETANALYZER_TRANSPARENT     241

/*
 * IP-over-Infiniband, as specified by RFC 4391.
 *
 * Requested by Petr Sumbera <petr.sumbera@oracle.com>.
 */
#define DLT_IPOIB               242

/*
 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0).
 *
 * Requested by Guy Martin <gmsoft@tuxicoman.be>.
 */
#define DLT_MPEG_2_TS           243

/*
 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as
 * used by their ng40 protocol tester.
 *
 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>.
 */
#define DLT_NG40                244

/*
 * Pseudo-header giving adapter number and flags, followed by an NFC
 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU,
 * as specified by NFC Forum Logical Link Control Protocol Technical
 * Specification LLCP 1.1.
 *
 * Requested by Mike Wakerly <mikey@google.com>.
 */
#define DLT_NFC_LLCP            245


#define DLT_MATCHING_MAX        245     /* highest value in the "matching" range */

/*
 * 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 }

#pragma pack(4)

/*
 * Structure to retrieve available DLTs for the interface.
 */
struct bpf_dltlist {
        u_int32_t               bfl_len;        /* number of bfd_list array */
        union {
                u_int32_t       *bflu_list;     /* array of DLTs */
                u_int64_t       bflu_pad;
        } bfl_u;
};
#define bfl_list bfl_u.bflu_list

#pragma pack()

#ifdef KERNEL_PRIVATE
/* Forward declerations */
struct ifnet;
struct mbuf;

extern int      bpf_validate(const struct bpf_insn *, int);
extern void     bpfdetach(struct ifnet *);
extern void     bpfilterattach(int);
extern u_int    bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
#endif /* KERNEL_PRIVATE */

#ifdef KERNEL
#ifndef BPF_TAP_MODE_T
#define BPF_TAP_MODE_T
/*!
        @enum BPF tap mode
        @abstract Constants defining interface families.
        @constant BPF_MODE_DISABLED Disable bpf.
        @constant BPF_MODE_INPUT Enable input only.
        @constant BPF_MODE_OUTPUT Enable output only.
        @constant BPF_MODE_INPUT_OUTPUT Enable input and output.
*/

enum {
        BPF_MODE_DISABLED       = 0,
        BPF_MODE_INPUT          = 1,
        BPF_MODE_OUTPUT         = 2,
        BPF_MODE_INPUT_OUTPUT   = 3
};
/*!
        @typedef bpf_tap_mode
        @abstract Mode for tapping. BPF_MODE_DISABLED/BPF_MODE_INPUT_OUTPUT etc.
*/
typedef u_int32_t bpf_tap_mode;
#endif /* !BPF_TAP_MODE_T */

/*!
        @typedef bpf_send_func
        @discussion bpf_send_func is called when a bpf file descriptor is
                used to send a raw packet on the interface. The mbuf and data
                link type are specified. The callback is responsible for
                releasing the mbuf whether or not it returns an error.
        @param interface The interface the packet is being sent on.
        @param dlt The data link type the bpf device is attached to.
        @param packet The packet to be sent.
 */
typedef errno_t (*bpf_send_func)(ifnet_t interface, u_int32_t data_link_type,
                                                                 mbuf_t packet);

/*!
        @typedef bpf_tap_func
        @discussion bpf_tap_func is called when the tap state of the
                interface changes. This happens when a bpf device attaches to an
                interface or detaches from an interface. The tap mode will join
                together (bit or) the modes of all bpf devices using that
                interface for that dlt. If you return an error from this
                function, the bpf device attach attempt that triggered the tap
                will fail. If this function was called bacuse the tap state was
                decreasing (tap in or out is stopping), the error will be
                ignored.
        @param interface The interface being tapped.
        @param dlt The data link type being tapped.
        @param direction The direction of the tap.
 */
typedef errno_t (*bpf_tap_func)(ifnet_t interface, u_int32_t data_link_type,
                                                                bpf_tap_mode direction);

/*!
        @function bpfattach
        @discussion Registers an interface with BPF. This allows bpf devices
                to attach to your interface to capture packets. Your interface
                will be unregistered automatically when your interface is
                detached.
        @param interface The interface to register with BPF.
        @param data_link_type The data link type of the interface. See the
                DLT_* defines in bpf.h.
        @param header_length The length, in bytes, of the data link header.
 */
extern void  bpfattach(ifnet_t interface, u_int data_link_type,
    u_int header_length);

/*!
        @function bpf_attach
        @discussion Registers an interface with BPF. This allows bpf devices
                to attach to your interface to capture and transmit packets.
                Your interface will be unregistered automatically when your
                interface is detached. You may register multiple times with
                different data link types. An 802.11 interface would use this to
                allow clients to pick whether they want just an ethernet style
                frame or the 802.11 wireless headers as well. The first dlt you
                register will be considered the default. Any bpf device attaches
                that do not specify a data link type will use the default.
        @param interface The interface to register with BPF.
        @param data_link_type The data link type of the interface. See the
                DLT_* defines in bpf.h.
        @param header_length The length, in bytes, of the data link header.
        @param send See the bpf_send_func described above.
        @param tap See the bpf_tap_func described above.
 */
extern errno_t  bpf_attach(ifnet_t interface, u_int32_t data_link_type,
    u_int32_t header_length, bpf_send_func send, bpf_tap_func tap);

/*!
        @function bpf_tap_in
        @discussion Call this function when your interface receives a
                packet. This function will check if any bpf devices need a
                a copy of the packet.
        @param interface The interface the packet was received on.
        @param dlt The data link type of the packet.
        @param packet The packet received.
        @param header An optional pointer to a header that will be prepended.
        @param headerlen If the header was specified, the length of the header.
 */
extern void bpf_tap_in(ifnet_t interface, u_int32_t dlt, mbuf_t packet,
    void *header, size_t header_len);

/*!
        @function bpf_tap_out
        @discussion Call this function when your interface trasmits a
                packet. This function will check if any bpf devices need a
                a copy of the packet.
        @param interface The interface the packet was or will be transmitted on.
        @param dlt The data link type of the packet.
        @param packet The packet received.
        @param header An optional pointer to a header that will be prepended.
        @param headerlen If the header was specified, the length of the header.
 */
extern void bpf_tap_out(ifnet_t interface, u_int32_t dlt, mbuf_t packet,
    void *header, size_t header_len);

#endif /* KERNEL */

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

#endif /* _NET_BPF_H_ */