FreeBSD/Linux Kernel Cross Reference
sys/net/bpf.h

     /*-
      * 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.
     * 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: releng/8.0/sys/net/bpf.h 190639 2009-04-02 13:02:12Z rpaulo $
     */
    
    #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
    
    /*
     * Historically, BPF has supported a single buffering model, first using mbuf
     * clusters in kernel, and later using malloc(9) buffers in kernel.  We now
     * support multiple buffering modes, which may be queried and set using
     * BIOCGETBUFMODE and BIOCSETBUFMODE.  So as to avoid handling the complexity
    * of changing modes while sniffing packets, the mode becomes fixed once an
    * interface has been attached to the BPF descriptor.
    */
   #define BPF_BUFMODE_BUFFER      1       /* Kernel buffers with read(). */
   #define BPF_BUFMODE_ZBUF        2       /* Zero-copy buffers. */
   
   /*-
    * Struct used by BIOCSETZBUF, BIOCROTZBUF: describes up to two zero-copy
    * buffer as used by BPF.
    */
   struct bpf_zbuf {
           void    *bz_bufa;       /* Location of 'a' zero-copy buffer. */
           void    *bz_bufb;       /* Location of 'b' zero-copy buffer. */
           size_t   bz_buflen;     /* Size of zero-copy buffers. */
   };
   
   #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 BIOCGDIRECTION  _IOR('B',118, u_int)
   #define BIOCSDIRECTION  _IOW('B',119, u_int)
   #define BIOCSDLT        _IOW('B',120, u_int)
   #define BIOCGDLTLIST    _IOWR('B',121, struct bpf_dltlist)
   #define BIOCLOCK        _IO('B', 122)
   #define BIOCSETWF       _IOW('B',123, struct bpf_program)
   #define BIOCFEEDBACK    _IOW('B',124, u_int)
   #define BIOCGETBUFMODE  _IOR('B',125, u_int)
   #define BIOCSETBUFMODE  _IOW('B',126, u_int)
   #define BIOCGETZMAX     _IOR('B',127, size_t)
   #define BIOCROTZBUF     _IOR('B',128, struct bpf_zbuf)
   #define BIOCSETZBUF     _IOW('B',129, struct bpf_zbuf)
   #define BIOCSETFNR      _IOW('B',130, struct bpf_program)
   
   /* Obsolete */
   #define BIOCGSEESENT    BIOCGDIRECTION
   #define BIOCSSEESENT    BIOCSDIRECTION
   
   /* Packet directions */
   enum bpf_direction {
           BPF_D_IN,       /* See incoming packets */
           BPF_D_INOUT,    /* See incoming and outgoing packets */
           BPF_D_OUT       /* See outgoing packets */
   };
   
   /*
    * 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
   
   /*
    * When using zero-copy BPF buffers, a shared memory header is present
    * allowing the kernel BPF implementation and user process to synchronize
    * without using system calls.  This structure defines that header.  When
    * accessing these fields, appropriate atomic operation and memory barriers
    * are required in order not to see stale or out-of-order data; see bpf(4)
    * for reference code to access these fields from userspace.
    *
    * The layout of this structure is critical, and must not be changed; if must
    * fit in a single page on all architectures.
    */
   struct bpf_zbuf_header {
           volatile u_int  bzh_kernel_gen; /* Kernel generation number. */
           volatile u_int  bzh_kernel_len; /* Length of data in the buffer. */
           volatile u_int  bzh_user_gen;   /* User generation number. */
           u_int _bzh_pad[5];
   };
   
   /*
    * Data-link level type codes.
    */
   #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 */
   #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 */
   
   /*
    * 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 */
   
   /*
    * Reserved for the Symantec Enterprise Firewall.
    */
   #define DLT_SYMANTEC_FIREWALL   99
   
   
   /*
    * 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 as a DLT_ value.
    */
   #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
   
   /*
    * Reserved for use in capture-file headers as a link-layer type
    * corresponding to 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.
    */
   #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 use by OpenBSD's pfsync device.
    */
   #define DLT_PFSYNC      121
   
   /*
    * 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
   
   /*
    * 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
   
   /*
    * DLT and savefile link type values are split into a class and
    * a member of that class.  A class value of 0 indicates a regular
    * DLT_/LINKTYPE_ value.
    */
   #define DLT_CLASS(x)            ((x) & 0x03ff0000)
   
   /*
    * 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 }
   
   /*
    * Structure to retrieve available DLTs for the interface.
    */
   struct bpf_dltlist {
           u_int   bfl_len;        /* number of bfd_list array */
           u_int   *bfl_list;      /* array of DLTs */
   };
   
   #ifdef _KERNEL
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_BPF);
   #endif
   #ifdef SYSCTL_DECL
   SYSCTL_DECL(_net_bpf);
   #endif
   
   /*
    * Rotate the packet buffers in descriptor d.  Move the store buffer into the
    * hold slot, and the free buffer ino the store slot.  Zero the length of the
    * new store buffer.  Descriptor lock should be held.
    */
   #define ROTATE_BUFFERS(d)       do {                                    \
           (d)->bd_hbuf = (d)->bd_sbuf;                                    \
           (d)->bd_hlen = (d)->bd_slen;                                    \
           (d)->bd_sbuf = (d)->bd_fbuf;                                    \
           (d)->bd_slen = 0;                                               \
           (d)->bd_fbuf = NULL;                                            \
           bpf_bufheld(d);                                                 \
   } while (0)
   
   /*
    * Descriptor associated with each attached hardware interface.
    */
   struct bpf_if {
           LIST_ENTRY(bpf_if)      bif_next;       /* list of all interfaces */
           LIST_HEAD(, bpf_d)      bif_dlist;      /* descriptor list */
           u_int bif_dlt;                          /* link layer type */
           u_int bif_hdrlen;               /* length of header (with padding) */
           struct ifnet *bif_ifp;          /* corresponding interface */
           struct mtx      bif_mtx;        /* mutex for interface */
   };
   
   void     bpf_bufheld(struct bpf_d *d);
   int      bpf_validate(const struct bpf_insn *, int);
   void     bpf_tap(struct bpf_if *, u_char *, u_int);
   void     bpf_mtap(struct bpf_if *, struct mbuf *);
   void     bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *);
   void     bpfattach(struct ifnet *, u_int, u_int);
   void     bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
   void     bpfdetach(struct ifnet *);
   
   void     bpfilterattach(int);
   u_int    bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
   
   static __inline int
   bpf_peers_present(struct bpf_if *bpf)
   {
   
           if (!LIST_EMPTY(&bpf->bif_dlist))
                   return (1);
           return (0);
   }
   
   #define BPF_TAP(_ifp,_pkt,_pktlen) do {                         \
           if (bpf_peers_present((_ifp)->if_bpf))                  \
                   bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen));     \
   } while (0)
   #define BPF_MTAP(_ifp,_m) do {                                  \
           if (bpf_peers_present((_ifp)->if_bpf)) {                \
                   M_ASSERTVALID(_m);                              \
                   bpf_mtap((_ifp)->if_bpf, (_m));                 \
           }                                                       \
   } while (0)
   #define BPF_MTAP2(_ifp,_data,_dlen,_m) do {                     \
           if (bpf_peers_present((_ifp)->if_bpf)) {                \
                   M_ASSERTVALID(_m);                              \
                   bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \
           }                                                       \
   } while (0)
   #endif
   
   /*
    * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
    */
   #define BPF_MEMWORDS 16
   
   #endif /* _NET_BPF_H_ */

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