The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/bpf.h

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    1 /*-
    2  * Copyright (c) 1990, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from the Stanford/CMU enet packet filter,
    6  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
    7  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
    8  * Berkeley Laboratory.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)bpf.h       8.1 (Berkeley) 6/10/93
   35  *      @(#)bpf.h       1.34 (LBL)     6/16/96
   36  *
   37  * $FreeBSD: releng/10.1/sys/net/bpf.h 244090 2012-12-10 16:14:44Z ghelmer $
   38  */
   39 
   40 #ifndef _NET_BPF_H_
   41 #define _NET_BPF_H_
   42 
   43 /* BSD style release date */
   44 #define BPF_RELEASE 199606
   45 
   46 typedef int32_t   bpf_int32;
   47 typedef u_int32_t bpf_u_int32;
   48 typedef int64_t   bpf_int64;
   49 typedef u_int64_t bpf_u_int64;
   50 
   51 /*
   52  * Alignment macros.  BPF_WORDALIGN rounds up to the next
   53  * even multiple of BPF_ALIGNMENT.
   54  */
   55 #define BPF_ALIGNMENT sizeof(long)
   56 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
   57 
   58 #define BPF_MAXINSNS 512
   59 #define BPF_MAXBUFSIZE 0x80000
   60 #define BPF_MINBUFSIZE 32
   61 
   62 /*
   63  *  Structure for BIOCSETF.
   64  */
   65 struct bpf_program {
   66         u_int bf_len;
   67         struct bpf_insn *bf_insns;
   68 };
   69 
   70 /*
   71  * Struct returned by BIOCGSTATS.
   72  */
   73 struct bpf_stat {
   74         u_int bs_recv;          /* number of packets received */
   75         u_int bs_drop;          /* number of packets dropped */
   76 };
   77 
   78 /*
   79  * Struct return by BIOCVERSION.  This represents the version number of
   80  * the filter language described by the instruction encodings below.
   81  * bpf understands a program iff kernel_major == filter_major &&
   82  * kernel_minor >= filter_minor, that is, if the value returned by the
   83  * running kernel has the same major number and a minor number equal
   84  * equal to or less than the filter being downloaded.  Otherwise, the
   85  * results are undefined, meaning an error may be returned or packets
   86  * may be accepted haphazardly.
   87  * It has nothing to do with the source code version.
   88  */
   89 struct bpf_version {
   90         u_short bv_major;
   91         u_short bv_minor;
   92 };
   93 /* Current version number of filter architecture. */
   94 #define BPF_MAJOR_VERSION 1
   95 #define BPF_MINOR_VERSION 1
   96 
   97 /*
   98  * Historically, BPF has supported a single buffering model, first using mbuf
   99  * clusters in kernel, and later using malloc(9) buffers in kernel.  We now
  100  * support multiple buffering modes, which may be queried and set using
  101  * BIOCGETBUFMODE and BIOCSETBUFMODE.  So as to avoid handling the complexity
  102  * of changing modes while sniffing packets, the mode becomes fixed once an
  103  * interface has been attached to the BPF descriptor.
  104  */
  105 #define BPF_BUFMODE_BUFFER      1       /* Kernel buffers with read(). */
  106 #define BPF_BUFMODE_ZBUF        2       /* Zero-copy buffers. */
  107 
  108 /*-
  109  * Struct used by BIOCSETZBUF, BIOCROTZBUF: describes up to two zero-copy
  110  * buffer as used by BPF.
  111  */
  112 struct bpf_zbuf {
  113         void    *bz_bufa;       /* Location of 'a' zero-copy buffer. */
  114         void    *bz_bufb;       /* Location of 'b' zero-copy buffer. */
  115         size_t   bz_buflen;     /* Size of zero-copy buffers. */
  116 };
  117 
  118 #define BIOCGBLEN       _IOR('B', 102, u_int)
  119 #define BIOCSBLEN       _IOWR('B', 102, u_int)
  120 #define BIOCSETF        _IOW('B', 103, struct bpf_program)
  121 #define BIOCFLUSH       _IO('B', 104)
  122 #define BIOCPROMISC     _IO('B', 105)
  123 #define BIOCGDLT        _IOR('B', 106, u_int)
  124 #define BIOCGETIF       _IOR('B', 107, struct ifreq)
  125 #define BIOCSETIF       _IOW('B', 108, struct ifreq)
  126 #define BIOCSRTIMEOUT   _IOW('B', 109, struct timeval)
  127 #define BIOCGRTIMEOUT   _IOR('B', 110, struct timeval)
  128 #define BIOCGSTATS      _IOR('B', 111, struct bpf_stat)
  129 #define BIOCIMMEDIATE   _IOW('B', 112, u_int)
  130 #define BIOCVERSION     _IOR('B', 113, struct bpf_version)
  131 #define BIOCGRSIG       _IOR('B', 114, u_int)
  132 #define BIOCSRSIG       _IOW('B', 115, u_int)
  133 #define BIOCGHDRCMPLT   _IOR('B', 116, u_int)
  134 #define BIOCSHDRCMPLT   _IOW('B', 117, u_int)
  135 #define BIOCGDIRECTION  _IOR('B', 118, u_int)
  136 #define BIOCSDIRECTION  _IOW('B', 119, u_int)
  137 #define BIOCSDLT        _IOW('B', 120, u_int)
  138 #define BIOCGDLTLIST    _IOWR('B', 121, struct bpf_dltlist)
  139 #define BIOCLOCK        _IO('B', 122)
  140 #define BIOCSETWF       _IOW('B', 123, struct bpf_program)
  141 #define BIOCFEEDBACK    _IOW('B', 124, u_int)
  142 #define BIOCGETBUFMODE  _IOR('B', 125, u_int)
  143 #define BIOCSETBUFMODE  _IOW('B', 126, u_int)
  144 #define BIOCGETZMAX     _IOR('B', 127, size_t)
  145 #define BIOCROTZBUF     _IOR('B', 128, struct bpf_zbuf)
  146 #define BIOCSETZBUF     _IOW('B', 129, struct bpf_zbuf)
  147 #define BIOCSETFNR      _IOW('B', 130, struct bpf_program)
  148 #define BIOCGTSTAMP     _IOR('B', 131, u_int)
  149 #define BIOCSTSTAMP     _IOW('B', 132, u_int)
  150 
  151 /* Obsolete */
  152 #define BIOCGSEESENT    BIOCGDIRECTION
  153 #define BIOCSSEESENT    BIOCSDIRECTION
  154 
  155 /* Packet directions */
  156 enum bpf_direction {
  157         BPF_D_IN,       /* See incoming packets */
  158         BPF_D_INOUT,    /* See incoming and outgoing packets */
  159         BPF_D_OUT       /* See outgoing packets */
  160 };
  161 
  162 /* Time stamping functions */
  163 #define BPF_T_MICROTIME         0x0000
  164 #define BPF_T_NANOTIME          0x0001
  165 #define BPF_T_BINTIME           0x0002
  166 #define BPF_T_NONE              0x0003
  167 #define BPF_T_FORMAT_MASK       0x0003
  168 #define BPF_T_NORMAL            0x0000
  169 #define BPF_T_FAST              0x0100
  170 #define BPF_T_MONOTONIC         0x0200
  171 #define BPF_T_MONOTONIC_FAST    (BPF_T_FAST | BPF_T_MONOTONIC)
  172 #define BPF_T_FLAG_MASK         0x0300
  173 #define BPF_T_FORMAT(t)         ((t) & BPF_T_FORMAT_MASK)
  174 #define BPF_T_FLAG(t)           ((t) & BPF_T_FLAG_MASK)
  175 #define BPF_T_VALID(t)                                          \
  176     ((t) == BPF_T_NONE || (BPF_T_FORMAT(t) != BPF_T_NONE &&     \
  177     ((t) & ~(BPF_T_FORMAT_MASK | BPF_T_FLAG_MASK)) == 0))
  178 
  179 #define BPF_T_MICROTIME_FAST            (BPF_T_MICROTIME | BPF_T_FAST)
  180 #define BPF_T_NANOTIME_FAST             (BPF_T_NANOTIME | BPF_T_FAST)
  181 #define BPF_T_BINTIME_FAST              (BPF_T_BINTIME | BPF_T_FAST)
  182 #define BPF_T_MICROTIME_MONOTONIC       (BPF_T_MICROTIME | BPF_T_MONOTONIC)
  183 #define BPF_T_NANOTIME_MONOTONIC        (BPF_T_NANOTIME | BPF_T_MONOTONIC)
  184 #define BPF_T_BINTIME_MONOTONIC         (BPF_T_BINTIME | BPF_T_MONOTONIC)
  185 #define BPF_T_MICROTIME_MONOTONIC_FAST  (BPF_T_MICROTIME | BPF_T_MONOTONIC_FAST)
  186 #define BPF_T_NANOTIME_MONOTONIC_FAST   (BPF_T_NANOTIME | BPF_T_MONOTONIC_FAST)
  187 #define BPF_T_BINTIME_MONOTONIC_FAST    (BPF_T_BINTIME | BPF_T_MONOTONIC_FAST)
  188 
  189 /*
  190  * Structure prepended to each packet.
  191  */
  192 struct bpf_ts {
  193         bpf_int64       bt_sec;         /* seconds */
  194         bpf_u_int64     bt_frac;        /* fraction */
  195 };
  196 struct bpf_xhdr {
  197         struct bpf_ts   bh_tstamp;      /* time stamp */
  198         bpf_u_int32     bh_caplen;      /* length of captured portion */
  199         bpf_u_int32     bh_datalen;     /* original length of packet */
  200         u_short         bh_hdrlen;      /* length of bpf header (this struct
  201                                            plus alignment padding) */
  202 };
  203 /* Obsolete */
  204 struct bpf_hdr {
  205         struct timeval  bh_tstamp;      /* time stamp */
  206         bpf_u_int32     bh_caplen;      /* length of captured portion */
  207         bpf_u_int32     bh_datalen;     /* original length of packet */
  208         u_short         bh_hdrlen;      /* length of bpf header (this struct
  209                                            plus alignment padding) */
  210 };
  211 #ifdef _KERNEL
  212 #define MTAG_BPF                0x627066
  213 #define MTAG_BPF_TIMESTAMP      0
  214 #endif
  215 
  216 /*
  217  * When using zero-copy BPF buffers, a shared memory header is present
  218  * allowing the kernel BPF implementation and user process to synchronize
  219  * without using system calls.  This structure defines that header.  When
  220  * accessing these fields, appropriate atomic operation and memory barriers
  221  * are required in order not to see stale or out-of-order data; see bpf(4)
  222  * for reference code to access these fields from userspace.
  223  *
  224  * The layout of this structure is critical, and must not be changed; if must
  225  * fit in a single page on all architectures.
  226  */
  227 struct bpf_zbuf_header {
  228         volatile u_int  bzh_kernel_gen; /* Kernel generation number. */
  229         volatile u_int  bzh_kernel_len; /* Length of data in the buffer. */
  230         volatile u_int  bzh_user_gen;   /* User generation number. */
  231         u_int _bzh_pad[5];
  232 };
  233 
  234 /*
  235  * Data-link level type codes.
  236  */
  237 #define DLT_NULL        0       /* BSD loopback encapsulation */
  238 #define DLT_EN10MB      1       /* Ethernet (10Mb) */
  239 #define DLT_EN3MB       2       /* Experimental Ethernet (3Mb) */
  240 #define DLT_AX25        3       /* Amateur Radio AX.25 */
  241 #define DLT_PRONET      4       /* Proteon ProNET Token Ring */
  242 #define DLT_CHAOS       5       /* Chaos */
  243 #define DLT_IEEE802     6       /* IEEE 802 Networks */
  244 #define DLT_ARCNET      7       /* ARCNET */
  245 #define DLT_SLIP        8       /* Serial Line IP */
  246 #define DLT_PPP         9       /* Point-to-point Protocol */
  247 #define DLT_FDDI        10      /* FDDI */
  248 #define DLT_ATM_RFC1483 11      /* LLC/SNAP encapsulated atm */
  249 #define DLT_RAW         12      /* raw IP */
  250 
  251 /*
  252  * These are values from BSD/OS's "bpf.h".
  253  * These are not the same as the values from the traditional libpcap
  254  * "bpf.h"; however, these values shouldn't be generated by any
  255  * OS other than BSD/OS, so the correct values to use here are the
  256  * BSD/OS values.
  257  *
  258  * Platforms that have already assigned these values to other
  259  * DLT_ codes, however, should give these codes the values
  260  * from that platform, so that programs that use these codes will
  261  * continue to compile - even though they won't correctly read
  262  * files of these types.
  263  */
  264 #define DLT_SLIP_BSDOS  15      /* BSD/OS Serial Line IP */
  265 #define DLT_PPP_BSDOS   16      /* BSD/OS Point-to-point Protocol */
  266 
  267 #define DLT_ATM_CLIP    19      /* Linux Classical-IP over ATM */
  268 
  269 /*
  270  * These values are defined by NetBSD; other platforms should refrain from
  271  * using them for other purposes, so that NetBSD savefiles with link
  272  * types of 50 or 51 can be read as this type on all platforms.
  273  */
  274 #define DLT_PPP_SERIAL  50      /* PPP over serial with HDLC encapsulation */
  275 #define DLT_PPP_ETHER   51      /* PPP over Ethernet */
  276 
  277 /*
  278  * Reserved for the Symantec Enterprise Firewall.
  279  */
  280 #define DLT_SYMANTEC_FIREWALL   99
  281 
  282 /*
  283  * Values between 100 and 103 are used in capture file headers as
  284  * link-layer header type LINKTYPE_ values corresponding to DLT_ types
  285  * that differ between platforms; don't use those values for new DLT_
  286  * new types.
  287  */
  288 
  289 /*
  290  * Values starting with 104 are used for newly-assigned link-layer
  291  * header type values; for those link-layer header types, the DLT_
  292  * value returned by pcap_datalink() and passed to pcap_open_dead(),
  293  * and the LINKTYPE_ value that appears in capture files, are the
  294  * same.
  295  *
  296  * DLT_MATCHING_MIN is the lowest such value; DLT_MATCHING_MAX is
  297  * the highest such value.
  298  */
  299 #define DLT_MATCHING_MIN        104
  300 
  301 /*
  302  * This value was defined by libpcap 0.5; platforms that have defined
  303  * it with a different value should define it here with that value -
  304  * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
  305  * whatever value that happens to be, so programs will correctly
  306  * handle files with that link type regardless of the value of
  307  * DLT_C_HDLC.
  308  *
  309  * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
  310  * compatibility with programs written for BSD/OS.
  311  *
  312  * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
  313  * for source compatibility with programs written for libpcap 0.5.
  314  */
  315 #define DLT_C_HDLC      104     /* Cisco HDLC */
  316 #define DLT_CHDLC       DLT_C_HDLC
  317 
  318 #define DLT_IEEE802_11  105     /* IEEE 802.11 wireless */
  319 
  320 /*
  321  * Values between 106 and 107 are used in capture file headers as
  322  * link-layer types corresponding to DLT_ types that might differ
  323  * between platforms; don't use those values for new DLT_ new types.
  324  */
  325 
  326 /*
  327  * Frame Relay; BSD/OS has a DLT_FR with a value of 11, but that collides
  328  * with other values.
  329  * DLT_FR and DLT_FRELAY packets start with the Q.922 Frame Relay header
  330  * (DLCI, etc.).
  331  */
  332 #define DLT_FRELAY      107
  333 
  334 /*
  335  * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
  336  * that the AF_ type in the link-layer header is in network byte order.
  337  *
  338  * OpenBSD defines it as 12, but that collides with DLT_RAW, so we
  339  * define it as 108 here.  If OpenBSD picks up this file, it should
  340  * define DLT_LOOP as 12 in its version, as per the comment above -
  341  * and should not use 108 as a DLT_ value.
  342  */
  343 #define DLT_LOOP        108
  344 
  345 /*
  346  * Values between 109 and 112 are used in capture file headers as
  347  * link-layer types corresponding to DLT_ types that might differ
  348  * between platforms; don't use those values for new DLT_ new types.
  349  */
  350 
  351 /*
  352  * Encapsulated packets for IPsec; DLT_ENC is 13 in OpenBSD, but that's
  353  * DLT_SLIP_BSDOS in NetBSD, so we don't use 13 for it in OSes other
  354  * than OpenBSD.
  355  */
  356 #define DLT_ENC 109
  357 
  358 /*
  359  * This is for Linux cooked sockets.
  360  */
  361 #define DLT_LINUX_SLL   113
  362 
  363 /*
  364  * Apple LocalTalk hardware.
  365  */
  366 #define DLT_LTALK       114
  367 
  368 /*
  369  * Acorn Econet.
  370  */
  371 #define DLT_ECONET      115
  372 
  373 /*
  374  * Reserved for use with OpenBSD ipfilter.
  375  */
  376 #define DLT_IPFILTER    116
  377 
  378 /*
  379  * Reserved for use in capture-file headers as a link-layer type
  380  * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
  381  * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
  382  * in capture-file headers.
  383  */
  384 #define DLT_PFLOG       117
  385 
  386 /*
  387  * Registered for Cisco-internal use.
  388  */
  389 #define DLT_CISCO_IOS   118
  390 
  391 /*
  392  * Reserved for 802.11 cards using the Prism II chips, with a link-layer
  393  * header including Prism monitor mode information plus an 802.11
  394  * header.
  395  */
  396 #define DLT_PRISM_HEADER        119
  397 
  398 /*
  399  * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
  400  * (see Doug Ambrisko's FreeBSD patches).
  401  */
  402 #define DLT_AIRONET_HEADER      120
  403 
  404 /*
  405  * Reserved for use by OpenBSD's pfsync device.
  406  */
  407 #define DLT_PFSYNC      121
  408 
  409 /*
  410  * Reserved for Siemens HiPath HDLC. XXX
  411  */
  412 #define DLT_HHDLC       121
  413 
  414 /*
  415  * Reserved for RFC 2625 IP-over-Fibre Channel.
  416  */
  417 #define DLT_IP_OVER_FC  122
  418 
  419 /*
  420  * Reserved for Full Frontal ATM on Solaris.
  421  */
  422 #define DLT_SUNATM      123
  423 
  424 /*
  425  * Reserved as per request from Kent Dahlgren <kent@praesum.com>
  426  * for private use.
  427  */
  428 #define DLT_RIO         124     /* RapidIO */
  429 #define DLT_PCI_EXP     125     /* PCI Express */
  430 #define DLT_AURORA      126     /* Xilinx Aurora link layer */
  431 
  432 /*
  433  * BSD header for 802.11 plus a number of bits of link-layer information
  434  * including radio information.
  435  */
  436 #ifndef DLT_IEEE802_11_RADIO
  437 #define DLT_IEEE802_11_RADIO    127
  438 #endif
  439 
  440 /*
  441  * Reserved for TZSP encapsulation.
  442  */
  443 #define DLT_TZSP                128     /* Tazmen Sniffer Protocol */
  444 
  445 /*
  446  * Reserved for Linux ARCNET.
  447  */
  448 #define DLT_ARCNET_LINUX        129
  449 
  450 /*
  451  * Juniper-private data link types.
  452  */
  453 #define DLT_JUNIPER_MLPPP       130
  454 #define DLT_JUNIPER_MLFR        131
  455 #define DLT_JUNIPER_ES          132
  456 #define DLT_JUNIPER_GGSN        133
  457 #define DLT_JUNIPER_MFR         134
  458 #define DLT_JUNIPER_ATM2        135
  459 #define DLT_JUNIPER_SERVICES    136
  460 #define DLT_JUNIPER_ATM1        137
  461 
  462 /*
  463  * Apple IP-over-IEEE 1394, as per a request from Dieter Siegmund
  464  * <dieter@apple.com>.  The header that's presented is an Ethernet-like
  465  * header:
  466  *
  467  *      #define FIREWIRE_EUI64_LEN      8
  468  *      struct firewire_header {
  469  *              u_char  firewire_dhost[FIREWIRE_EUI64_LEN];
  470  *              u_char  firewire_shost[FIREWIRE_EUI64_LEN];
  471  *              u_short firewire_type;
  472  *      };
  473  *
  474  * with "firewire_type" being an Ethernet type value, rather than,
  475  * for example, raw GASP frames being handed up.
  476  */
  477 #define DLT_APPLE_IP_OVER_IEEE1394      138
  478 
  479 /*
  480  * Various SS7 encapsulations, as per a request from Jeff Morriss
  481  * <jeff.morriss[AT]ulticom.com> and subsequent discussions.
  482  */
  483 #define DLT_MTP2_WITH_PHDR      139     /* pseudo-header with various info, followed by MTP2 */
  484 #define DLT_MTP2                140     /* MTP2, without pseudo-header */
  485 #define DLT_MTP3                141     /* MTP3, without pseudo-header or MTP2 */
  486 #define DLT_SCCP                142     /* SCCP, without pseudo-header or MTP2 or MTP3 */
  487 
  488 /*
  489  * Reserved for DOCSIS.
  490  */
  491 #define DLT_DOCSIS      143
  492 
  493 /*
  494  * Reserved for Linux IrDA.
  495  */
  496 #define DLT_LINUX_IRDA  144
  497 
  498 /*
  499  * Reserved for IBM SP switch and IBM Next Federation switch.
  500  */
  501 #define DLT_IBM_SP      145
  502 #define DLT_IBM_SN      146
  503 
  504 /*
  505  * Reserved for private use.  If you have some link-layer header type
  506  * that you want to use within your organization, with the capture files
  507  * using that link-layer header type not ever be sent outside your
  508  * organization, you can use these values.
  509  *
  510  * No libpcap release will use these for any purpose, nor will any
  511  * tcpdump release use them, either.
  512  *
  513  * Do *NOT* use these in capture files that you expect anybody not using
  514  * your private versions of capture-file-reading tools to read; in
  515  * particular, do *NOT* use them in products, otherwise you may find that
  516  * people won't be able to use tcpdump, or snort, or Ethereal, or... to
  517  * read capture files from your firewall/intrusion detection/traffic
  518  * monitoring/etc. appliance, or whatever product uses that DLT_ value,
  519  * and you may also find that the developers of those applications will
  520  * not accept patches to let them read those files.
  521  *
  522  * Also, do not use them if somebody might send you a capture using them
  523  * for *their* private type and tools using them for *your* private type
  524  * would have to read them.
  525  *
  526  * Instead, ask "tcpdump-workers@tcpdump.org" for a new DLT_ value,
  527  * as per the comment above, and use the type you're given.
  528  */
  529 #define DLT_USER0               147
  530 #define DLT_USER1               148
  531 #define DLT_USER2               149
  532 #define DLT_USER3               150
  533 #define DLT_USER4               151
  534 #define DLT_USER5               152
  535 #define DLT_USER6               153
  536 #define DLT_USER7               154
  537 #define DLT_USER8               155
  538 #define DLT_USER9               156
  539 #define DLT_USER10              157
  540 #define DLT_USER11              158
  541 #define DLT_USER12              159
  542 #define DLT_USER13              160
  543 #define DLT_USER14              161
  544 #define DLT_USER15              162
  545 
  546 /*
  547  * For future use with 802.11 captures - defined by AbsoluteValue
  548  * Systems to store a number of bits of link-layer information
  549  * including radio information:
  550  *
  551  *      http://www.shaftnet.org/~pizza/software/capturefrm.txt
  552  *
  553  * but it might be used by some non-AVS drivers now or in the
  554  * future.
  555  */
  556 #define DLT_IEEE802_11_RADIO_AVS 163    /* 802.11 plus AVS radio header */
  557 
  558 /*
  559  * Juniper-private data link type, as per request from
  560  * Hannes Gredler <hannes@juniper.net>.  The DLT_s are used
  561  * for passing on chassis-internal metainformation such as
  562  * QOS profiles, etc..
  563  */
  564 #define DLT_JUNIPER_MONITOR     164
  565 
  566 /*
  567  * Reserved for BACnet MS/TP.
  568  */
  569 #define DLT_BACNET_MS_TP        165
  570 
  571 /*
  572  * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
  573  *
  574  * This is used in some OSes to allow a kernel socket filter to distinguish
  575  * between incoming and outgoing packets, on a socket intended to
  576  * supply pppd with outgoing packets so it can do dial-on-demand and
  577  * hangup-on-lack-of-demand; incoming packets are filtered out so they
  578  * don't cause pppd to hold the connection up (you don't want random
  579  * input packets such as port scans, packets from old lost connections,
  580  * etc. to force the connection to stay up).
  581  *
  582  * The first byte of the PPP header (0xff03) is modified to accomodate
  583  * the direction - 0x00 = IN, 0x01 = OUT.
  584  */
  585 #define DLT_PPP_PPPD            166
  586 
  587 /*
  588  * Names for backwards compatibility with older versions of some PPP
  589  * software; new software should use DLT_PPP_PPPD.
  590  */
  591 #define DLT_PPP_WITH_DIRECTION  DLT_PPP_PPPD
  592 #define DLT_LINUX_PPP_WITHDIRECTION     DLT_PPP_PPPD
  593 
  594 /*
  595  * Juniper-private data link type, as per request from
  596  * Hannes Gredler <hannes@juniper.net>.  The DLT_s are used
  597  * for passing on chassis-internal metainformation such as
  598  * QOS profiles, cookies, etc..
  599  */
  600 #define DLT_JUNIPER_PPPOE       167
  601 #define DLT_JUNIPER_PPPOE_ATM   168
  602 
  603 #define DLT_GPRS_LLC            169     /* GPRS LLC */
  604 #define DLT_GPF_T               170     /* GPF-T (ITU-T G.7041/Y.1303) */
  605 #define DLT_GPF_F               171     /* GPF-F (ITU-T G.7041/Y.1303) */
  606 
  607 /*
  608  * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
  609  * monitoring equipment.
  610  */
  611 #define DLT_GCOM_T1E1           172
  612 #define DLT_GCOM_SERIAL         173
  613 
  614 /*
  615  * Juniper-private data link type, as per request from
  616  * Hannes Gredler <hannes@juniper.net>.  The DLT_ is used
  617  * for internal communication to Physical Interface Cards (PIC)
  618  */
  619 #define DLT_JUNIPER_PIC_PEER    174
  620 
  621 /*
  622  * Link types requested by Gregor Maier <gregor@endace.com> of Endace
  623  * Measurement Systems.  They add an ERF header (see
  624  * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
  625  * the link-layer header.
  626  */
  627 #define DLT_ERF_ETH             175     /* Ethernet */
  628 #define DLT_ERF_POS             176     /* Packet-over-SONET */
  629 
  630 /*
  631  * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
  632  * for vISDN (http://www.orlandi.com/visdn/).  Its link-layer header
  633  * includes additional information before the LAPD header, so it's
  634  * not necessarily a generic LAPD header.
  635  */
  636 #define DLT_LINUX_LAPD          177
  637 
  638 /*
  639  * Juniper-private data link type, as per request from
  640  * Hannes Gredler <hannes@juniper.net>.
  641  * The DLT_ are used for prepending meta-information
  642  * like interface index, interface name
  643  * before standard Ethernet, PPP, Frelay & C-HDLC Frames
  644  */
  645 #define DLT_JUNIPER_ETHER       178
  646 #define DLT_JUNIPER_PPP         179
  647 #define DLT_JUNIPER_FRELAY      180
  648 #define DLT_JUNIPER_CHDLC       181
  649 
  650 /*
  651  * Multi Link Frame Relay (FRF.16)
  652  */
  653 #define DLT_MFR                 182
  654 
  655 /*
  656  * Juniper-private data link type, as per request from
  657  * Hannes Gredler <hannes@juniper.net>.
  658  * The DLT_ is used for internal communication with a
  659  * voice Adapter Card (PIC)
  660  */
  661 #define DLT_JUNIPER_VP          183
  662 
  663 /*
  664  * Arinc 429 frames.
  665  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
  666  * Every frame contains a 32bit A429 label.
  667  * More documentation on Arinc 429 can be found at
  668  * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
  669  */
  670 #define DLT_A429                184
  671 
  672 /*
  673  * Arinc 653 Interpartition Communication messages.
  674  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
  675  * Please refer to the A653-1 standard for more information.
  676  */
  677 #define DLT_A653_ICM            185
  678 
  679 /*
  680  * USB packets, beginning with a USB setup header; requested by
  681  * Paolo Abeni <paolo.abeni@email.it>.
  682  */
  683 #define DLT_USB                 186
  684 
  685 /*
  686  * Bluetooth HCI UART transport layer (part H:4); requested by
  687  * Paolo Abeni.
  688  */
  689 #define DLT_BLUETOOTH_HCI_H4    187
  690 
  691 /*
  692  * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
  693  * <cruz_petagay@bah.com>.
  694  */
  695 #define DLT_IEEE802_16_MAC_CPS  188
  696 
  697 /*
  698  * USB packets, beginning with a Linux USB header; requested by
  699  * Paolo Abeni <paolo.abeni@email.it>.
  700  */
  701 #define DLT_USB_LINUX           189
  702 
  703 /*
  704  * Controller Area Network (CAN) v. 2.0B packets.
  705  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
  706  * Used to dump CAN packets coming from a CAN Vector board.
  707  * More documentation on the CAN v2.0B frames can be found at
  708  * http://www.can-cia.org/downloads/?269
  709  */
  710 #define DLT_CAN20B              190
  711 
  712 /*
  713  * IEEE 802.15.4, with address fields padded, as is done by Linux
  714  * drivers; requested by Juergen Schimmer.
  715  */
  716 #define DLT_IEEE802_15_4_LINUX  191
  717 
  718 /*
  719  * Per Packet Information encapsulated packets.
  720  * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
  721  */
  722 #define DLT_PPI                 192
  723 
  724 /*
  725  * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
  726  * requested by Charles Clancy.
  727  */
  728 #define DLT_IEEE802_16_MAC_CPS_RADIO    193
  729 
  730 /*
  731  * Juniper-private data link type, as per request from
  732  * Hannes Gredler <hannes@juniper.net>.
  733  * The DLT_ is used for internal communication with a
  734  * integrated service module (ISM).
  735  */
  736 #define DLT_JUNIPER_ISM         194
  737 
  738 /*
  739  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
  740  * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
  741  */
  742 #define DLT_IEEE802_15_4        195
  743 
  744 /*
  745  * Various link-layer types, with a pseudo-header, for SITA
  746  * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
  747  */
  748 #define DLT_SITA                196
  749 
  750 /*
  751  * Various link-layer types, with a pseudo-header, for Endace DAG cards;
  752  * encapsulates Endace ERF records.  Requested by Stephen Donnelly
  753  * <stephen@endace.com>.
  754  */
  755 #define DLT_ERF                 197
  756 
  757 /*
  758  * Special header prepended to Ethernet packets when capturing from a
  759  * u10 Networks board.  Requested by Phil Mulholland
  760  * <phil@u10networks.com>.
  761  */
  762 #define DLT_RAIF1               198
  763 
  764 /*
  765  * IPMB packet for IPMI, beginning with the I2C slave address, followed
  766  * by the netFn and LUN, etc..  Requested by Chanthy Toeung
  767  * <chanthy.toeung@ca.kontron.com>.
  768  */
  769 #define DLT_IPMB                199
  770 
  771 /*
  772  * Juniper-private data link type, as per request from
  773  * Hannes Gredler <hannes@juniper.net>.
  774  * The DLT_ is used for capturing data on a secure tunnel interface.
  775  */
  776 #define DLT_JUNIPER_ST          200
  777 
  778 /*
  779  * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
  780  * that includes direction information; requested by Paolo Abeni.
  781  */
  782 #define DLT_BLUETOOTH_HCI_H4_WITH_PHDR  201
  783 
  784 /*
  785  * AX.25 packet with a 1-byte KISS header; see
  786  *
  787  *      http://www.ax25.net/kiss.htm
  788  *
  789  * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
  790  */
  791 #define DLT_AX25_KISS           202
  792 
  793 /*
  794  * LAPD packets from an ISDN channel, starting with the address field,
  795  * with no pseudo-header.
  796  * Requested by Varuna De Silva <varunax@gmail.com>.
  797  */
  798 #define DLT_LAPD                203
  799 
  800 /*
  801  * Variants of various link-layer headers, with a one-byte direction
  802  * pseudo-header prepended - zero means "received by this host",
  803  * non-zero (any non-zero value) means "sent by this host" - as per
  804  * Will Barker <w.barker@zen.co.uk>.
  805  */
  806 #define DLT_PPP_WITH_DIR        204     /* PPP - don't confuse with DLT_PPP_WITH_DIRECTION */
  807 #define DLT_C_HDLC_WITH_DIR     205     /* Cisco HDLC */
  808 #define DLT_FRELAY_WITH_DIR     206     /* Frame Relay */
  809 #define DLT_LAPB_WITH_DIR       207     /* LAPB */
  810 
  811 /*
  812  * 208 is reserved for an as-yet-unspecified proprietary link-layer
  813  * type, as requested by Will Barker.
  814  */
  815 
  816 /*
  817  * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
  818  * <avn@pigeonpoint.com>.
  819  */
  820 #define DLT_IPMB_LINUX          209
  821 
  822 /*
  823  * FlexRay automotive bus - http://www.flexray.com/ - as requested
  824  * by Hannes Kaelber <hannes.kaelber@x2e.de>.
  825  */
  826 #define DLT_FLEXRAY             210
  827 
  828 /*
  829  * Media Oriented Systems Transport (MOST) bus for multimedia
  830  * transport - http://www.mostcooperation.com/ - as requested
  831  * by Hannes Kaelber <hannes.kaelber@x2e.de>.
  832  */
  833 #define DLT_MOST                211
  834 
  835 /*
  836  * Local Interconnect Network (LIN) bus for vehicle networks -
  837  * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
  838  * <hannes.kaelber@x2e.de>.
  839  */
  840 #define DLT_LIN                 212
  841 
  842 /*
  843  * X2E-private data link type used for serial line capture,
  844  * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
  845  */
  846 #define DLT_X2E_SERIAL          213
  847 
  848 /*
  849  * X2E-private data link type used for the Xoraya data logger
  850  * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
  851  */
  852 #define DLT_X2E_XORAYA          214
  853 
  854 /*
  855  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
  856  * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
  857  * of 0 as preamble, one octet of SFD, one octet of frame length+
  858  * reserved bit, and then the MAC-layer data, starting with the
  859  * frame control field).
  860  *
  861  * Requested by Max Filippov <jcmvbkbc@gmail.com>.
  862  */
  863 #define DLT_IEEE802_15_4_NONASK_PHY     215
  864 
  865 /* 
  866  * David Gibson <david@gibson.dropbear.id.au> requested this for
  867  * captures from the Linux kernel /dev/input/eventN devices. This
  868  * is used to communicate keystrokes and mouse movements from the
  869  * Linux kernel to display systems, such as Xorg. 
  870  */
  871 #define DLT_LINUX_EVDEV         216
  872 
  873 /*
  874  * GSM Um and Abis interfaces, preceded by a "gsmtap" header.
  875  *
  876  * Requested by Harald Welte <laforge@gnumonks.org>.
  877  */
  878 #define DLT_GSMTAP_UM           217
  879 #define DLT_GSMTAP_ABIS         218
  880 
  881 /*
  882  * MPLS, with an MPLS label as the link-layer header.
  883  * Requested by Michele Marchetto <michele@openbsd.org> on behalf
  884  * of OpenBSD.
  885  */
  886 #define DLT_MPLS                219
  887 
  888 /*
  889  * USB packets, beginning with a Linux USB header, with the USB header
  890  * padded to 64 bytes; required for memory-mapped access.
  891  */
  892 #define DLT_USB_LINUX_MMAPPED   220
  893 
  894 /*
  895  * DECT packets, with a pseudo-header; requested by
  896  * Matthias Wenzel <tcpdump@mazzoo.de>.
  897  */
  898 #define DLT_DECT                221
  899 /*
  900  * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov>
  901  * Date: Mon, 11 May 2009 11:18:30 -0500
  902  *
  903  * DLT_AOS. We need it for AOS Space Data Link Protocol.
  904  *   I have already written dissectors for but need an OK from
  905  *   legal before I can submit a patch.
  906  *
  907  */
  908 #define DLT_AOS                 222
  909 
  910 /*
  911  * Wireless HART (Highway Addressable Remote Transducer)
  912  * From the HART Communication Foundation
  913  * IES/PAS 62591
  914  *
  915  * Requested by Sam Roberts <vieuxtech@gmail.com>.
  916  */
  917 #define DLT_WIHART              223
  918 
  919 /*
  920  * Fibre Channel FC-2 frames, beginning with a Frame_Header.
  921  * Requested by Kahou Lei <kahou82@gmail.com>.
  922  */
  923 #define DLT_FC_2                224
  924 
  925 /*
  926  * Fibre Channel FC-2 frames, beginning with an encoding of the
  927  * SOF, and ending with an encoding of the EOF.
  928  *
  929  * The encodings represent the frame delimiters as 4-byte sequences
  930  * representing the corresponding ordered sets, with K28.5
  931  * represented as 0xBC, and the D symbols as the corresponding
  932  * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2,
  933  * is represented as 0xBC 0xB5 0x55 0x55.
  934  *
  935  * Requested by Kahou Lei <kahou82@gmail.com>.
  936  */
  937 #define DLT_FC_2_WITH_FRAME_DELIMS      225
  938 /*
  939  * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>.
  940  *
  941  * The pseudo-header starts with a one-byte version number; for version 2,
  942  * the pseudo-header is:
  943  *
  944  * struct dl_ipnetinfo {
  945  *     u_int8_t   dli_version;
  946  *     u_int8_t   dli_family;
  947  *     u_int16_t  dli_htype;
  948  *     u_int32_t  dli_pktlen;
  949  *     u_int32_t  dli_ifindex;
  950  *     u_int32_t  dli_grifindex;
  951  *     u_int32_t  dli_zsrc;
  952  *     u_int32_t  dli_zdst;
  953  * };
  954  *
  955  * dli_version is 2 for the current version of the pseudo-header.
  956  *
  957  * dli_family is a Solaris address family value, so it's 2 for IPv4
  958  * and 26 for IPv6.
  959  *
  960  * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing
  961  * packets, and 2 for packets arriving from another zone on the same
  962  * machine.
  963  *
  964  * dli_pktlen is the length of the packet data following the pseudo-header
  965  * (so the captured length minus dli_pktlen is the length of the
  966  * pseudo-header, assuming the entire pseudo-header was captured).
  967  *
  968  * dli_ifindex is the interface index of the interface on which the
  969  * packet arrived.
  970  *
  971  * dli_grifindex is the group interface index number (for IPMP interfaces).
  972  *
  973  * dli_zsrc is the zone identifier for the source of the packet.
  974  *
  975  * dli_zdst is the zone identifier for the destination of the packet.
  976  *
  977  * A zone number of 0 is the global zone; a zone number of 0xffffffff
  978  * means that the packet arrived from another host on the network, not
  979  * from another zone on the same machine.
  980  *
  981  * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates
  982  * which of those it is.
  983  */
  984 #define DLT_IPNET                       226
  985 
  986 /*
  987  * CAN (Controller Area Network) frames, with a pseudo-header as supplied
  988  * by Linux SocketCAN.  See Documentation/networking/can.txt in the Linux
  989  * source.
  990  *
  991  * Requested by Felix Obenhuber <felix@obenhuber.de>.
  992  */
  993 #define DLT_CAN_SOCKETCAN               227
  994 
  995 /*
  996  * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies
  997  * whether it's v4 or v6.  Requested by Darren Reed <Darren.Reed@Sun.COM>.
  998  */
  999 #define DLT_IPV4                228
 1000 #define DLT_IPV6                229
 1001 
 1002 /*
 1003  * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
 1004  * nothing), and with no FCS at the end of the frame; requested by
 1005  * Jon Smirl <jonsmirl@gmail.com>.
 1006  */
 1007 #define DLT_IEEE802_15_4_NOFCS  230
 1008 
 1009 /*
 1010  * Raw D-Bus:
 1011  *
 1012  *      http://www.freedesktop.org/wiki/Software/dbus
 1013  *
 1014  * messages:
 1015  *
 1016  *      http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
 1017  *
 1018  * starting with the endianness flag, followed by the message type, etc.,
 1019  * but without the authentication handshake before the message sequence:
 1020  *
 1021  *      http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
 1022  *
 1023  * Requested by Martin Vidner <martin@vidner.net>.
 1024  */
 1025 #define DLT_DBUS                231
 1026 
 1027 /*
 1028  * Juniper-private data link type, as per request from
 1029  * Hannes Gredler <hannes@juniper.net>.
 1030  */
 1031 #define DLT_JUNIPER_VS                  232
 1032 #define DLT_JUNIPER_SRX_E2E             233
 1033 #define DLT_JUNIPER_FIBRECHANNEL        234
 1034 
 1035 /*
 1036  * DVB-CI (DVB Common Interface for communication between a PC Card
 1037  * module and a DVB receiver).  See
 1038  *
 1039  *      http://www.kaiser.cx/pcap-dvbci.html
 1040  *
 1041  * for the specification.
 1042  *
 1043  * Requested by Martin Kaiser <martin@kaiser.cx>.
 1044  */
 1045 #define DLT_DVB_CI              235
 1046 
 1047 /*
 1048  * Variant of 3GPP TS 27.010 multiplexing protocol (similar to, but
 1049  * *not* the same as, 27.010).  Requested by Hans-Christoph Schemmel
 1050  * <hans-christoph.schemmel@cinterion.com>.
 1051  */
 1052 #define DLT_MUX27010            236
 1053 
 1054 /*
 1055  * STANAG 5066 D_PDUs.  Requested by M. Baris Demiray
 1056  * <barisdemiray@gmail.com>.
 1057  */
 1058 #define DLT_STANAG_5066_D_PDU   237
 1059 
 1060 /*
 1061  * Juniper-private data link type, as per request from
 1062  * Hannes Gredler <hannes@juniper.net>.
 1063  */
 1064 #define DLT_JUNIPER_ATM_CEMIC   238
 1065 
 1066 /*
 1067  * NetFilter LOG messages 
 1068  * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets)
 1069  *
 1070  * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl>
 1071  */
 1072 #define DLT_NFLOG               239
 1073 
 1074 /*
 1075  * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
 1076  * for Ethernet packets with a 4-byte pseudo-header and always
 1077  * with the payload including the FCS, as supplied by their
 1078  * netANALYZER hardware and software.
 1079  *
 1080  * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
 1081  */
 1082 #define DLT_NETANALYZER         240
 1083 
 1084 /*
 1085  * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type
 1086  * for Ethernet packets with a 4-byte pseudo-header and FCS and
 1087  * with the Ethernet header preceded by 7 bytes of preamble and
 1088  * 1 byte of SFD, as supplied by their netANALYZER hardware and
 1089  * software.
 1090  *
 1091  * Requested by Holger P. Frommer <HPfrommer@hilscher.com>
 1092  */
 1093 #define DLT_NETANALYZER_TRANSPARENT     241
 1094 
 1095 /*
 1096  * IP-over-Infiniband, as specified by RFC 4391.
 1097  *
 1098  * Requested by Petr Sumbera <petr.sumbera@oracle.com>.
 1099  */
 1100 #define DLT_IPOIB               242
 1101 
 1102 /*
 1103  * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0).
 1104  *
 1105  * Requested by Guy Martin <gmsoft@tuxicoman.be>.
 1106  */
 1107 #define DLT_MPEG_2_TS           243
 1108 
 1109 /*
 1110  * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as
 1111  * used by their ng40 protocol tester.
 1112  *
 1113  * Requested by Jens Grimmer <jens.grimmer@ng4t.com>.
 1114  */
 1115 #define DLT_NG40                244
 1116 
 1117 /*
 1118  * Pseudo-header giving adapter number and flags, followed by an NFC
 1119  * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU,
 1120  * as specified by NFC Forum Logical Link Control Protocol Technical
 1121  * Specification LLCP 1.1.
 1122  *
 1123  * Requested by Mike Wakerly <mikey@google.com>.
 1124  */
 1125 #define DLT_NFC_LLCP            245
 1126 
 1127 /*
 1128  * 245 is used as LINKTYPE_PFSYNC; do not use it for any other purpose.
 1129  *
 1130  * DLT_PFSYNC has different values on different platforms, and all of
 1131  * them collide with something used elsewhere.  On platforms that
 1132  * don't already define it, define it as 245.
 1133  */
 1134 #if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__) && !defined(__DragonFly__) && !defined(__APPLE__)
 1135 #define DLT_PFSYNC              246
 1136 #endif
 1137 
 1138 #define DLT_MATCHING_MAX        246     /* highest value in the "matching" range */
 1139 
 1140 /*
 1141  * DLT and savefile link type values are split into a class and
 1142  * a member of that class.  A class value of 0 indicates a regular
 1143  * DLT_/LINKTYPE_ value.
 1144  */
 1145 #define DLT_CLASS(x)            ((x) & 0x03ff0000)
 1146 
 1147 /*
 1148  * The instruction encodings.
 1149  */
 1150 /* instruction classes */
 1151 #define BPF_CLASS(code) ((code) & 0x07)
 1152 #define         BPF_LD          0x00
 1153 #define         BPF_LDX         0x01
 1154 #define         BPF_ST          0x02
 1155 #define         BPF_STX         0x03
 1156 #define         BPF_ALU         0x04
 1157 #define         BPF_JMP         0x05
 1158 #define         BPF_RET         0x06
 1159 #define         BPF_MISC        0x07
 1160 
 1161 /* ld/ldx fields */
 1162 #define BPF_SIZE(code)  ((code) & 0x18)
 1163 #define         BPF_W           0x00
 1164 #define         BPF_H           0x08
 1165 #define         BPF_B           0x10
 1166 #define BPF_MODE(code)  ((code) & 0xe0)
 1167 #define         BPF_IMM         0x00
 1168 #define         BPF_ABS         0x20
 1169 #define         BPF_IND         0x40
 1170 #define         BPF_MEM         0x60
 1171 #define         BPF_LEN         0x80
 1172 #define         BPF_MSH         0xa0
 1173 
 1174 /* alu/jmp fields */
 1175 #define BPF_OP(code)    ((code) & 0xf0)
 1176 #define         BPF_ADD         0x00
 1177 #define         BPF_SUB         0x10
 1178 #define         BPF_MUL         0x20
 1179 #define         BPF_DIV         0x30
 1180 #define         BPF_OR          0x40
 1181 #define         BPF_AND         0x50
 1182 #define         BPF_LSH         0x60
 1183 #define         BPF_RSH         0x70
 1184 #define         BPF_NEG         0x80
 1185 #define         BPF_JA          0x00
 1186 #define         BPF_JEQ         0x10
 1187 #define         BPF_JGT         0x20
 1188 #define         BPF_JGE         0x30
 1189 #define         BPF_JSET        0x40
 1190 #define BPF_SRC(code)   ((code) & 0x08)
 1191 #define         BPF_K           0x00
 1192 #define         BPF_X           0x08
 1193 
 1194 /* ret - BPF_K and BPF_X also apply */
 1195 #define BPF_RVAL(code)  ((code) & 0x18)
 1196 #define         BPF_A           0x10
 1197 
 1198 /* misc */
 1199 #define BPF_MISCOP(code) ((code) & 0xf8)
 1200 #define         BPF_TAX         0x00
 1201 #define         BPF_TXA         0x80
 1202 
 1203 /*
 1204  * The instruction data structure.
 1205  */
 1206 struct bpf_insn {
 1207         u_short         code;
 1208         u_char          jt;
 1209         u_char          jf;
 1210         bpf_u_int32     k;
 1211 };
 1212 
 1213 /*
 1214  * Macros for insn array initializers.
 1215  */
 1216 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
 1217 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
 1218 
 1219 /*
 1220  * Structure to retrieve available DLTs for the interface.
 1221  */
 1222 struct bpf_dltlist {
 1223         u_int   bfl_len;        /* number of bfd_list array */
 1224         u_int   *bfl_list;      /* array of DLTs */
 1225 };
 1226 
 1227 #ifdef _KERNEL
 1228 #ifdef MALLOC_DECLARE
 1229 MALLOC_DECLARE(M_BPF);
 1230 #endif
 1231 #ifdef SYSCTL_DECL
 1232 SYSCTL_DECL(_net_bpf);
 1233 #endif
 1234 
 1235 /*
 1236  * Rotate the packet buffers in descriptor d.  Move the store buffer into the
 1237  * hold slot, and the free buffer ino the store slot.  Zero the length of the
 1238  * new store buffer.  Descriptor lock should be held. Hold buffer must
 1239  * not be marked "in use".
 1240  */
 1241 #define ROTATE_BUFFERS(d)       do {                                    \
 1242         (d)->bd_hbuf = (d)->bd_sbuf;                                    \
 1243         (d)->bd_hlen = (d)->bd_slen;                                    \
 1244         (d)->bd_sbuf = (d)->bd_fbuf;                                    \
 1245         (d)->bd_slen = 0;                                               \
 1246         (d)->bd_fbuf = NULL;                                            \
 1247         bpf_bufheld(d);                                                 \
 1248 } while (0)
 1249 
 1250 /*
 1251  * Descriptor associated with each attached hardware interface.
 1252  * FIXME: this structure is exposed to external callers to speed up
 1253  * bpf_peers_present() call. However we cover all fields not needed by
 1254  * this function via BPF_INTERNAL define
 1255  */
 1256 struct bpf_if {
 1257         LIST_ENTRY(bpf_if)      bif_next;       /* list of all interfaces */
 1258         LIST_HEAD(, bpf_d)      bif_dlist;      /* descriptor list */
 1259 #ifdef BPF_INTERNAL
 1260         u_int bif_dlt;                          /* link layer type */
 1261         u_int bif_hdrlen;               /* length of link header */
 1262         struct ifnet *bif_ifp;          /* corresponding interface */
 1263         struct rwlock bif_lock;         /* interface lock */
 1264         LIST_HEAD(, bpf_d)      bif_wlist;      /* writer-only list */
 1265         int flags;                      /* Interface flags */
 1266 #endif
 1267 };
 1268 
 1269 void     bpf_bufheld(struct bpf_d *d);
 1270 int      bpf_validate(const struct bpf_insn *, int);
 1271 void     bpf_tap(struct bpf_if *, u_char *, u_int);
 1272 void     bpf_mtap(struct bpf_if *, struct mbuf *);
 1273 void     bpf_mtap2(struct bpf_if *, void *, u_int, struct mbuf *);
 1274 void     bpfattach(struct ifnet *, u_int, u_int);
 1275 void     bpfattach2(struct ifnet *, u_int, u_int, struct bpf_if **);
 1276 void     bpfdetach(struct ifnet *);
 1277 
 1278 void     bpfilterattach(int);
 1279 u_int    bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
 1280 
 1281 static __inline int
 1282 bpf_peers_present(struct bpf_if *bpf)
 1283 {
 1284 
 1285         if (!LIST_EMPTY(&bpf->bif_dlist))
 1286                 return (1);
 1287         return (0);
 1288 }
 1289 
 1290 #define BPF_TAP(_ifp,_pkt,_pktlen) do {                         \
 1291         if (bpf_peers_present((_ifp)->if_bpf))                  \
 1292                 bpf_tap((_ifp)->if_bpf, (_pkt), (_pktlen));     \
 1293 } while (0)
 1294 #define BPF_MTAP(_ifp,_m) do {                                  \
 1295         if (bpf_peers_present((_ifp)->if_bpf)) {                \
 1296                 M_ASSERTVALID(_m);                              \
 1297                 bpf_mtap((_ifp)->if_bpf, (_m));                 \
 1298         }                                                       \
 1299 } while (0)
 1300 #define BPF_MTAP2(_ifp,_data,_dlen,_m) do {                     \
 1301         if (bpf_peers_present((_ifp)->if_bpf)) {                \
 1302                 M_ASSERTVALID(_m);                              \
 1303                 bpf_mtap2((_ifp)->if_bpf,(_data),(_dlen),(_m)); \
 1304         }                                                       \
 1305 } while (0)
 1306 #endif
 1307 
 1308 /*
 1309  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
 1310  */
 1311 #define BPF_MEMWORDS 16
 1312 
 1313 #endif /* _NET_BPF_H_ */

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