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 /*      $NetBSD: bpf.h,v 1.78 2022/06/20 08:20:09 yamaguchi Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1990, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from the Stanford/CMU enet packet filter,
    8  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
    9  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
   10  * Berkeley Laboratory.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)bpf.h       8.2 (Berkeley) 1/9/95
   37  * @(#) Header: bpf.h,v 1.36 97/06/12 14:29:53 leres Exp  (LBL)
   38  */
   39 
   40 #ifndef _NET_BPF_H_
   41 #define _NET_BPF_H_
   42 
   43 #include <sys/ioccom.h>
   44 #include <sys/time.h>
   45 
   46 /* BSD style release date */
   47 #define BPF_RELEASE 199606
   48 
   49 /* Date when COP instructions and external memory have been released. */
   50 #define BPF_COP_EXTMEM_RELEASE 20140624
   51 
   52 __BEGIN_DECLS
   53 
   54 typedef int bpf_int32;
   55 typedef u_int bpf_u_int32;
   56 
   57 /*
   58  * Alignment macros.  BPF_WORDALIGN rounds up to the next
   59  * even multiple of BPF_ALIGNMENT.
   60  */
   61 #define BPF_ALIGNMENT sizeof(long)
   62 #define BPF_ALIGNMENT32 sizeof(int)
   63 
   64 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
   65 #define BPF_WORDALIGN32(x) (((x)+(BPF_ALIGNMENT32-1))&~(BPF_ALIGNMENT32-1))
   66 
   67 #define BPF_MAXINSNS 512
   68 #define BPF_DFLTBUFSIZE (1024*1024)     /* default static upper limit */
   69 #define BPF_MAXBUFSIZE (1024*1024*16)   /* hard limit on sysctl'able value */
   70 #define BPF_MINBUFSIZE 32
   71 
   72 /*
   73  *  Structure for BIOCSETF.
   74  */
   75 struct bpf_program {
   76         u_int bf_len;
   77         struct bpf_insn *bf_insns;
   78 };
   79 
   80 /*
   81  * Struct returned by BIOCGSTATS and net.bpf.stats sysctl.
   82  */
   83 struct bpf_stat {
   84         uint64_t bs_recv;       /* number of packets received */
   85         uint64_t bs_drop;       /* number of packets dropped */
   86         uint64_t bs_capt;       /* number of packets captured */
   87         uint64_t bs_padding[13];
   88 };
   89 
   90 /*
   91  * Struct returned by BIOCGSTATSOLD.
   92  */
   93 struct bpf_stat_old {
   94         u_int bs_recv;          /* number of packets received */
   95         u_int bs_drop;          /* number of packets dropped */
   96 };
   97 
   98 /*
   99  * Struct return by BIOCVERSION.  This represents the version number of
  100  * the filter language described by the instruction encodings below.
  101  * bpf understands a program iff kernel_major == filter_major &&
  102  * kernel_minor >= filter_minor, that is, if the value returned by the
  103  * running kernel has the same major number and a minor number equal
  104  * equal to or less than the filter being downloaded.  Otherwise, the
  105  * results are undefined, meaning an error may be returned or packets
  106  * may be accepted haphazardly.
  107  * It has nothing to do with the source code version.
  108  */
  109 struct bpf_version {
  110         u_short bv_major;
  111         u_short bv_minor;
  112 };
  113 /* Current version number of filter architecture. */
  114 #define BPF_MAJOR_VERSION 1
  115 #define BPF_MINOR_VERSION 1
  116 
  117 /*
  118  * BPF ioctls
  119  *
  120  * The first set is for compatibility with Sun's pcc style
  121  * header files.  If your using gcc, we assume that you
  122  * have run fixincludes so the latter set should work.
  123  */
  124 #define BIOCGBLEN        _IOR('B', 102, u_int)
  125 #define BIOCSBLEN       _IOWR('B', 102, u_int)
  126 #define BIOCSETF         _IOW('B', 103, struct bpf_program)
  127 #define BIOCFLUSH         _IO('B', 104)
  128 #define BIOCPROMISC       _IO('B', 105)
  129 #define BIOCGDLT         _IOR('B', 106, u_int)
  130 #define BIOCGETIF        _IOR('B', 107, struct ifreq)
  131 #define BIOCSETIF        _IOW('B', 108, struct ifreq)
  132 #ifdef COMPAT_50
  133 #include <compat/sys/time.h>
  134 #define BIOCSORTIMEOUT   _IOW('B', 109, struct timeval50)
  135 #define BIOCGORTIMEOUT   _IOR('B', 110, struct timeval50)
  136 #endif
  137 #define BIOCGSTATS       _IOR('B', 111, struct bpf_stat)
  138 #define BIOCGSTATSOLD    _IOR('B', 111, struct bpf_stat_old)
  139 #define BIOCIMMEDIATE    _IOW('B', 112, u_int)
  140 #define BIOCVERSION      _IOR('B', 113, struct bpf_version)
  141 #define BIOCSTCPF        _IOW('B', 114, struct bpf_program)
  142 #define BIOCSUDPF        _IOW('B', 115, struct bpf_program)
  143 #define BIOCGHDRCMPLT    _IOR('B', 116, u_int)
  144 #define BIOCSHDRCMPLT    _IOW('B', 117, u_int)
  145 #define BIOCSDLT         _IOW('B', 118, u_int)
  146 #define BIOCGDLTLIST    _IOWR('B', 119, struct bpf_dltlist)
  147 #define BIOCGDIRECTION   _IOR('B', 120, u_int)
  148 #define BIOCSDIRECTION   _IOW('B', 121, u_int)
  149 #define BIOCSRTIMEOUT    _IOW('B', 122, struct timeval)
  150 #define BIOCGRTIMEOUT    _IOR('B', 123, struct timeval)
  151 #define BIOCGFEEDBACK    _IOR('B', 124, u_int)
  152 #define BIOCSFEEDBACK    _IOW('B', 125, u_int)
  153 #define BIOCFEEDBACK     BIOCSFEEDBACK          /* FreeBSD name */
  154 #define BIOCLOCK          _IO('B', 126)
  155 #define BIOCSETWF        _IOW('B', 127, struct bpf_program)
  156 
  157 /* Obsolete */
  158 #define BIOCGSEESENT    BIOCGDIRECTION
  159 #define BIOCSSEESENT    BIOCSDIRECTION
  160 
  161 /*
  162  * Packet directions.
  163  * BPF_D_IN = 0, BPF_D_INOUT =1 for backward compatibility of BIOC[GS]SEESENT.
  164  */
  165 #define BPF_D_IN        0       /* See incoming packets */
  166 #define BPF_D_INOUT     1       /* See incoming and outgoing packets */
  167 #define BPF_D_OUT       2       /* See outgoing packets */
  168 
  169 /*
  170  * Structure prepended to each packet. This is "wire" format, so we
  171  * cannot change it unfortunately to 64 bit times on 32 bit systems [yet].
  172  */
  173 struct bpf_timeval {
  174         long tv_sec;
  175         long tv_usec;
  176 };
  177 
  178 struct bpf_timeval32 {
  179         int32_t tv_sec;
  180         int32_t tv_usec;
  181 };
  182 
  183 struct bpf_hdr {
  184         struct bpf_timeval bh_tstamp;   /* time stamp */
  185         uint32_t        bh_caplen;      /* length of captured portion */
  186         uint32_t        bh_datalen;     /* original length of packet */
  187         uint16_t        bh_hdrlen;      /* length of bpf header (this struct
  188                                            plus alignment padding) */
  189 };
  190 
  191 struct bpf_hdr32 {
  192         struct bpf_timeval32 bh_tstamp; /* time stamp */
  193         uint32_t        bh_caplen;      /* length of captured portion */
  194         uint32_t        bh_datalen;     /* original length of packet */
  195         uint16_t        bh_hdrlen;      /* length of bpf header (this struct
  196                                            plus alignment padding) */
  197 };
  198 /*
  199  * Because the structure above is not a multiple of 4 bytes, some compilers
  200  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
  201  * Only the kernel needs to know about it; applications use bh_hdrlen.
  202  * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
  203  * XXX padding by using the size of the header data elements.  This is
  204  * XXX fail-safe: on new machines, we just use the 'safe' sizeof.
  205  */
  206 #ifdef _KERNEL
  207 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
  208     defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \
  209     defined(__sh__) || (defined(__sparc__) && !defined(__sparc64__))
  210 #define SIZEOF_BPF_HDR 18
  211 #define SIZEOF_BPF_HDR32 18
  212 #else
  213 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
  214 #define SIZEOF_BPF_HDR32 sizeof(struct bpf_hdr32)
  215 #endif
  216 #endif
  217 
  218 /* Pull in data-link level type codes. */
  219 #include <net/dlt.h>
  220 
  221 /*
  222  * The instruction encodings.
  223  */
  224 /* instruction classes */
  225 #define BPF_CLASS(code) ((code) & 0x07)
  226 #define         BPF_LD          0x00
  227 #define         BPF_LDX         0x01
  228 #define         BPF_ST          0x02
  229 #define         BPF_STX         0x03
  230 #define         BPF_ALU         0x04
  231 #define         BPF_JMP         0x05
  232 #define         BPF_RET         0x06
  233 #define         BPF_MISC        0x07
  234 
  235 /* ld/ldx fields */
  236 #define BPF_SIZE(code)  ((code) & 0x18)
  237 #define         BPF_W           0x00
  238 #define         BPF_H           0x08
  239 #define         BPF_B           0x10
  240 /*                              0x18    reserved; used by BSD/OS */
  241 #define BPF_MODE(code)  ((code) & 0xe0)
  242 #define         BPF_IMM         0x00
  243 #define         BPF_ABS         0x20
  244 #define         BPF_IND         0x40
  245 #define         BPF_MEM         0x60
  246 #define         BPF_LEN         0x80
  247 #define         BPF_MSH         0xa0
  248 /*                              0xc0    reserved; used by BSD/OS */
  249 /*                              0xe0    reserved; used by BSD/OS */
  250 
  251 /* alu/jmp fields */
  252 #define BPF_OP(code)    ((code) & 0xf0)
  253 #define         BPF_ADD         0x00
  254 #define         BPF_SUB         0x10
  255 #define         BPF_MUL         0x20
  256 #define         BPF_DIV         0x30
  257 #define         BPF_OR          0x40
  258 #define         BPF_AND         0x50
  259 #define         BPF_LSH         0x60
  260 #define         BPF_RSH         0x70
  261 #define         BPF_NEG         0x80
  262 #define         BPF_MOD         0x90
  263 #define         BPF_XOR         0xa0
  264 /*                              0xb0    reserved */
  265 /*                              0xc0    reserved */
  266 /*                              0xd0    reserved */
  267 /*                              0xe0    reserved */
  268 /*                              0xf0    reserved */
  269 #define         BPF_JA          0x00
  270 #define         BPF_JEQ         0x10
  271 #define         BPF_JGT         0x20
  272 #define         BPF_JGE         0x30
  273 #define         BPF_JSET        0x40
  274 /*                              0x50    reserved; used by BSD/OS */
  275 /*                              0x60    reserved */
  276 /*                              0x70    reserved */
  277 /*                              0x80    reserved */
  278 /*                              0x90    reserved */
  279 /*                              0xa0    reserved */
  280 /*                              0xb0    reserved */
  281 /*                              0xc0    reserved */
  282 /*                              0xd0    reserved */
  283 /*                              0xe0    reserved */
  284 /*                              0xf0    reserved */
  285 #define BPF_SRC(code)   ((code) & 0x08)
  286 #define         BPF_K           0x00
  287 #define         BPF_X           0x08
  288 
  289 /* ret - BPF_K and BPF_X also apply */
  290 #define BPF_RVAL(code)  ((code) & 0x18)
  291 #define         BPF_A           0x10
  292 /*                              0x18    reserved */
  293 
  294 /* misc */
  295 #define BPF_MISCOP(code) ((code) & 0xf8)
  296 #define         BPF_TAX         0x00
  297 /*                              0x10    reserved */
  298 /*                              0x18    reserved */
  299 #define         BPF_COP         0x20
  300 /*                              0x28    reserved */
  301 /*                              0x30    reserved */
  302 /*                              0x38    reserved */
  303 #define         BPF_COPX        0x40    /* XXX: also used by BSD/OS */
  304 /*                              0x48    reserved */
  305 /*                              0x50    reserved */
  306 /*                              0x58    reserved */
  307 /*                              0x60    reserved */
  308 /*                              0x68    reserved */
  309 /*                              0x70    reserved */
  310 /*                              0x78    reserved */
  311 #define         BPF_TXA         0x80
  312 /*                              0x88    reserved */
  313 /*                              0x90    reserved */
  314 /*                              0x98    reserved */
  315 /*                              0xa0    reserved */
  316 /*                              0xa8    reserved */
  317 /*                              0xb0    reserved */
  318 /*                              0xb8    reserved */
  319 /*                              0xc0    reserved; used by BSD/OS */
  320 /*                              0xc8    reserved */
  321 /*                              0xd0    reserved */
  322 /*                              0xd8    reserved */
  323 /*                              0xe0    reserved */
  324 /*                              0xe8    reserved */
  325 /*                              0xf0    reserved */
  326 /*                              0xf8    reserved */
  327 
  328 /*
  329  * The instruction data structure.
  330  */
  331 struct bpf_insn {
  332         uint16_t  code;
  333         u_char    jt;
  334         u_char    jf;
  335         uint32_t  k;
  336 };
  337 
  338 /*
  339  * Auxiliary data, for use when interpreting a filter intended for the
  340  * Linux kernel when the kernel rejects the filter (requiring us to
  341  * run it in userland).  It contains VLAN tag information.
  342  */
  343 struct bpf_aux_data {
  344         u_short vlan_tag_present;
  345         u_short vlan_tag;
  346 };
  347 
  348 /*
  349  * Macros for insn array initializers.
  350  */
  351 #define BPF_STMT(code, k) { (uint16_t)(code), 0, 0, k }
  352 #define BPF_JUMP(code, k, jt, jf) { (uint16_t)(code), jt, jf, k }
  353 
  354 /*
  355  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
  356  */
  357 #define BPF_MEMWORDS            16
  358 
  359 /*
  360  * bpf_memword_init_t: bits indicate which words in the external memory
  361  * store will be initialised by the caller before BPF program execution.
  362  */
  363 typedef uint32_t bpf_memword_init_t;
  364 #define BPF_MEMWORD_INIT(k)     (UINT32_C(1) << (k))
  365 
  366 /* Note: two most significant bits are reserved by bpfjit. */
  367 __CTASSERT(BPF_MEMWORDS + 2 <= sizeof(bpf_memword_init_t) * NBBY);
  368 
  369 #ifdef _KERNEL
  370 /*
  371  * Max number of external memory words (for BPF_LD|BPF_MEM and BPF_ST).
  372  */
  373 #define BPF_MAX_MEMWORDS        30
  374 
  375 __CTASSERT(BPF_MAX_MEMWORDS >= BPF_MEMWORDS);
  376 __CTASSERT(BPF_MAX_MEMWORDS + 2 <= sizeof(bpf_memword_init_t) * NBBY);
  377 #endif
  378 
  379 /*
  380  * Structure to retrieve available DLTs for the interface.
  381  */
  382 struct bpf_dltlist {
  383         u_int   bfl_len;        /* number of bfd_list array */
  384         u_int   *bfl_list;      /* array of DLTs */
  385 };
  386 
  387 struct bpf_ctx;
  388 typedef struct bpf_ctx bpf_ctx_t;
  389 
  390 typedef struct bpf_args {
  391         const uint8_t * pkt;
  392         size_t          wirelen;
  393         size_t          buflen;
  394         /*
  395          * The following arguments are used only by some kernel
  396          * subsystems.
  397          * They aren't required for classical bpf filter programs.
  398          * For such programs, bpfjit generated code doesn't read
  399          * those arguments at all. Note however that bpf interpreter
  400          * always needs a pointer to memstore.
  401          */
  402         uint32_t *      mem; /* pointer to external memory store */
  403         void *          arg; /* auxiliary argument for a copfunc */
  404 } bpf_args_t;
  405 
  406 #if defined(_KERNEL) || defined(__BPF_PRIVATE)
  407 
  408 typedef uint32_t (*bpf_copfunc_t)(const bpf_ctx_t *, bpf_args_t *, uint32_t);
  409 
  410 struct bpf_ctx {
  411         /*
  412          * BPF coprocessor functions and the number of them.
  413          */
  414         const bpf_copfunc_t *   copfuncs;
  415         size_t                  nfuncs;
  416 
  417         /*
  418          * The number of memory words in the external memory store.
  419          * There may be up to BPF_MAX_MEMWORDS words; if zero is set,
  420          * then the internal memory store is used which has a fixed
  421          * number of words (BPF_MEMWORDS).
  422          */
  423         size_t                  extwords;
  424 
  425         /*
  426          * The bitmask indicating which words in the external memstore
  427          * will be initialised by the caller.
  428          */
  429         bpf_memword_init_t      preinited;
  430 };
  431 #endif
  432 
  433 #ifdef _KERNEL
  434 #include <net/bpfjit.h>
  435 #include <net/if.h>
  436 
  437 struct bpf_if;
  438 
  439 struct bpf_ops {
  440         void (*bpf_attach)(struct ifnet *, u_int, u_int, struct bpf_if **);
  441         void (*bpf_detach)(struct ifnet *);
  442         void (*bpf_change_type)(struct ifnet *, u_int, u_int);
  443 
  444         void (*bpf_mtap)(struct bpf_if *, struct mbuf *, u_int);
  445         void (*bpf_mtap2)(struct bpf_if *, void *, u_int, struct mbuf *,
  446             u_int);
  447         void (*bpf_mtap_af)(struct bpf_if *, uint32_t, struct mbuf *, u_int);
  448         void (*bpf_mtap_sl_in)(struct bpf_if *, u_char *, struct mbuf **);
  449         void (*bpf_mtap_sl_out)(struct bpf_if *, u_char *, struct mbuf *);
  450 
  451         void (*bpf_mtap_softint_init)(struct ifnet *);
  452         void (*bpf_mtap_softint)(struct ifnet *, struct mbuf *);
  453 
  454         int (*bpf_register_track_event)(struct bpf_if **,
  455             void (*)(struct bpf_if *, struct ifnet *, int, int));
  456         int (*bpf_deregister_track_event)(struct bpf_if **,
  457             void (*)(struct bpf_if *, struct ifnet *, int, int));
  458 };
  459 
  460 extern struct bpf_ops *bpf_ops;
  461 
  462 static __inline void
  463 bpf_attach(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen)
  464 {
  465         bpf_ops->bpf_attach(_ifp, _dlt, _hdrlen, &_ifp->if_bpf);
  466 }
  467 
  468 static __inline void
  469 bpf_attach2(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen, struct bpf_if **_dp)
  470 {
  471         bpf_ops->bpf_attach(_ifp, _dlt, _hdrlen, _dp);
  472 }
  473 
  474 static __inline void
  475 bpf_mtap(struct ifnet *_ifp, struct mbuf *_m, u_int _direction)
  476 {
  477         if (_ifp->if_bpf) {
  478                 if (_ifp->if_bpf_mtap) {
  479                         _ifp->if_bpf_mtap(_ifp->if_bpf, _m, _direction);
  480                 } else {
  481                         bpf_ops->bpf_mtap(_ifp->if_bpf, _m, _direction);
  482                 }
  483         }
  484 }
  485 
  486 static __inline void
  487 bpf_mtap2(struct bpf_if *_bpf, void *_data, u_int _dlen, struct mbuf *_m,
  488         u_int _direction)
  489 {
  490         bpf_ops->bpf_mtap2(_bpf, _data, _dlen, _m, _direction);
  491 }
  492 
  493 static __inline void
  494 bpf_mtap3(struct bpf_if *_bpf, struct mbuf *_m, u_int _direction)
  495 {
  496         if (_bpf)
  497                 bpf_ops->bpf_mtap(_bpf, _m, _direction);
  498 }
  499 
  500 static __inline void
  501 bpf_mtap_af(struct ifnet *_ifp, uint32_t _af, struct mbuf *_m,
  502     u_int _direction)
  503 {
  504         if (_ifp->if_bpf)
  505                 bpf_ops->bpf_mtap_af(_ifp->if_bpf, _af, _m, _direction);
  506 }
  507 
  508 static __inline void
  509 bpf_change_type(struct ifnet *_ifp, u_int _dlt, u_int _hdrlen)
  510 {
  511         bpf_ops->bpf_change_type(_ifp, _dlt, _hdrlen);
  512 }
  513 
  514 static __inline bool
  515 bpf_peers_present(struct bpf_if *dp)
  516 {
  517         /*
  518          * Our code makes sure the driver visible pointer is NULL
  519          * whenever there is no listener on this tap.
  520          */
  521         return dp != NULL;
  522 }
  523 
  524 static __inline void
  525 bpf_detach(struct ifnet *_ifp)
  526 {
  527         bpf_ops->bpf_detach(_ifp);
  528 }
  529 
  530 static __inline void
  531 bpf_mtap_sl_in(struct ifnet *_ifp, u_char *_hdr, struct mbuf **_m)
  532 {
  533         bpf_ops->bpf_mtap_sl_in(_ifp->if_bpf, _hdr, _m);
  534 }
  535 
  536 static __inline void
  537 bpf_mtap_sl_out(struct ifnet *_ifp, u_char *_hdr, struct mbuf *_m)
  538 {
  539         if (_ifp->if_bpf)
  540                 bpf_ops->bpf_mtap_sl_out(_ifp->if_bpf, _hdr, _m);
  541 }
  542 
  543 static __inline void
  544 bpf_mtap_softint_init(struct ifnet *_ifp)
  545 {
  546 
  547         bpf_ops->bpf_mtap_softint_init(_ifp);
  548 }
  549 
  550 static __inline void
  551 bpf_mtap_softint(struct ifnet *_ifp, struct mbuf *_m)
  552 {
  553 
  554         if (_ifp->if_bpf)
  555                 bpf_ops->bpf_mtap_softint(_ifp, _m);
  556 }
  557 
  558 static __inline int
  559 bpf_register_track_event(struct bpf_if **_dp,
  560             void (*_fun)(struct bpf_if *, struct ifnet *, int, int))
  561 {
  562         if (bpf_ops->bpf_register_track_event == NULL)
  563                 return ENXIO;
  564         return bpf_ops->bpf_register_track_event(_dp, _fun);
  565 }
  566 
  567 static __inline int
  568 bpf_deregister_track_event(struct bpf_if **_dp,
  569             void (*_fun)(struct bpf_if *, struct ifnet *, int, int))
  570 {
  571         if (bpf_ops->bpf_deregister_track_event == NULL)
  572                 return ENXIO;
  573         return bpf_ops->bpf_deregister_track_event(_dp, _fun);
  574 }
  575 
  576 void    bpf_setops(void);
  577 
  578 void    bpf_ops_handover_enter(struct bpf_ops *);
  579 void    bpf_ops_handover_exit(void);
  580 
  581 void    bpfilterattach(int);
  582 
  583 bpf_ctx_t *bpf_create(void);
  584 void    bpf_destroy(bpf_ctx_t *);
  585 
  586 int     bpf_set_cop(bpf_ctx_t *, const bpf_copfunc_t *, size_t);
  587 int     bpf_set_extmem(bpf_ctx_t *, size_t, bpf_memword_init_t);
  588 u_int   bpf_filter_ext(const bpf_ctx_t *, const struct bpf_insn *, bpf_args_t *);
  589 int     bpf_validate_ext(const bpf_ctx_t *, const struct bpf_insn *, int);
  590 
  591 bpfjit_func_t bpf_jit_generate(bpf_ctx_t *, void *, size_t);
  592 void    bpf_jit_freecode(bpfjit_func_t);
  593 
  594 #endif
  595 
  596 int     bpf_validate(const struct bpf_insn *, int);
  597 u_int   bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
  598 
  599 u_int   bpf_filter_with_aux_data(const struct bpf_insn *, const u_char *, u_int, u_int, const struct bpf_aux_data *);
  600 
  601 /*
  602  * events to be tracked by bpf_register_track_event callbacks
  603  */
  604 #define BPF_TRACK_EVENT_ATTACH  1
  605 #define BPF_TRACK_EVENT_DETACH  2
  606 
  607 
  608 __END_DECLS
  609 
  610 #endif /* !_NET_BPF_H_ */

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