The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 1.48 2005/12/10 23:21:38 elad 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/time.h>
   44 
   45 /* BSD style release date */
   46 #define BPF_RELEASE 199606
   47 
   48 typedef int bpf_int32;
   49 typedef u_int bpf_u_int32;
   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_DFLTBUFSIZE (1024*1024)     /* default static upper limit */
   60 #define BPF_MAXBUFSIZE (1024*1024*16)   /* hard limit on sysctl'able value */
   61 #define BPF_MINBUFSIZE 32
   62 
   63 /*
   64  *  Structure for BIOCSETF.
   65  */
   66 struct bpf_program {
   67         u_int bf_len;
   68         struct bpf_insn *bf_insns;
   69 };
   70 
   71 /*
   72  * Struct returned by BIOCGSTATS and net.bpf.stats sysctl.
   73  */
   74 struct bpf_stat {
   75         uint64_t bs_recv;       /* number of packets received */
   76         uint64_t bs_drop;       /* number of packets dropped */
   77         uint64_t bs_capt;       /* number of packets captured */
   78         uint64_t bs_padding[13];
   79 };
   80 
   81 /*
   82  * Struct returned by BIOCGSTATSOLD.
   83  */
   84 struct bpf_stat_old {
   85         u_int bs_recv;          /* number of packets received */
   86         u_int bs_drop;          /* number of packets dropped */
   87 };
   88 
   89 /*
   90  * Struct return by BIOCVERSION.  This represents the version number of
   91  * the filter language described by the instruction encodings below.
   92  * bpf understands a program iff kernel_major == filter_major &&
   93  * kernel_minor >= filter_minor, that is, if the value returned by the
   94  * running kernel has the same major number and a minor number equal
   95  * equal to or less than the filter being downloaded.  Otherwise, the
   96  * results are undefined, meaning an error may be returned or packets
   97  * may be accepted haphazardly.
   98  * It has nothing to do with the source code version.
   99  */
  100 struct bpf_version {
  101         u_short bv_major;
  102         u_short bv_minor;
  103 };
  104 /* Current version number of filter architecture. */
  105 #define BPF_MAJOR_VERSION 1
  106 #define BPF_MINOR_VERSION 1
  107 
  108 /*
  109  * BPF ioctls
  110  *
  111  * The first set is for compatibility with Sun's pcc style
  112  * header files.  If your using gcc, we assume that you
  113  * have run fixincludes so the latter set should work.
  114  */
  115 #define BIOCGBLEN        _IOR('B',102, u_int)
  116 #define BIOCSBLEN       _IOWR('B',102, u_int)
  117 #define BIOCSETF         _IOW('B',103, struct bpf_program)
  118 #define BIOCFLUSH         _IO('B',104)
  119 #define BIOCPROMISC       _IO('B',105)
  120 #define BIOCGDLT         _IOR('B',106, u_int)
  121 #define BIOCGETIF        _IOR('B',107, struct ifreq)
  122 #define BIOCSETIF        _IOW('B',108, struct ifreq)
  123 #define BIOCSRTIMEOUT    _IOW('B',109, struct timeval)
  124 #define BIOCGRTIMEOUT    _IOR('B',110, struct timeval)
  125 #define BIOCGSTATS       _IOR('B',111, struct bpf_stat)
  126 #define BIOCGSTATSOLD    _IOR('B',111, struct bpf_stat_old)
  127 #define BIOCIMMEDIATE    _IOW('B',112, u_int)
  128 #define BIOCVERSION      _IOR('B',113, struct bpf_version)
  129 #define BIOCSTCPF        _IOW('B',114, struct bpf_program)
  130 #define BIOCSUDPF        _IOW('B',115, struct bpf_program)
  131 #define BIOCGHDRCMPLT    _IOR('B',116, u_int)
  132 #define BIOCSHDRCMPLT    _IOW('B',117, u_int)
  133 #define BIOCSDLT         _IOW('B',118, u_int)
  134 #define BIOCGDLTLIST    _IOWR('B',119, struct bpf_dltlist)
  135 #define BIOCGSEESENT     _IOR('B',120, u_int)
  136 #define BIOCSSEESENT     _IOW('B',121, u_int)
  137 
  138 /*
  139  * Structure prepended to each packet.
  140  */
  141 struct bpf_hdr {
  142         struct timeval  bh_tstamp;      /* time stamp */
  143         uint32_t        bh_caplen;      /* length of captured portion */
  144         uint32_t        bh_datalen;     /* original length of packet */
  145         uint16_t        bh_hdrlen;      /* length of bpf header (this struct
  146                                            plus alignment padding) */
  147 };
  148 /*
  149  * Because the structure above is not a multiple of 4 bytes, some compilers
  150  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
  151  * Only the kernel needs to know about it; applications use bh_hdrlen.
  152  * XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
  153  * XXX padding by using the size of the header data elements.  This is
  154  * XXX fail-safe: on new machines, we just use the 'safe' sizeof.
  155  */
  156 #ifdef _KERNEL
  157 #if defined(__arm32__) || defined(__i386__) || defined(__m68k__) || \
  158     defined(__mips__) || defined(__ns32k__) || defined(__vax__) || \
  159     defined(__sh__) || (defined(__sparc__) && !defined(__sparc64__))
  160 #define SIZEOF_BPF_HDR 18
  161 #else
  162 #define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
  163 #endif
  164 #endif
  165 
  166 /* Pull in data-link level type codes. */
  167 #include <net/dlt.h>
  168 
  169 /*
  170  * The instruction encodings.
  171  */
  172 /* instruction classes */
  173 #define BPF_CLASS(code) ((code) & 0x07)
  174 #define         BPF_LD          0x00
  175 #define         BPF_LDX         0x01
  176 #define         BPF_ST          0x02
  177 #define         BPF_STX         0x03
  178 #define         BPF_ALU         0x04
  179 #define         BPF_JMP         0x05
  180 #define         BPF_RET         0x06
  181 #define         BPF_MISC        0x07
  182 
  183 /* ld/ldx fields */
  184 #define BPF_SIZE(code)  ((code) & 0x18)
  185 #define         BPF_W           0x00
  186 #define         BPF_H           0x08
  187 #define         BPF_B           0x10
  188 #define BPF_MODE(code)  ((code) & 0xe0)
  189 #define         BPF_IMM         0x00
  190 #define         BPF_ABS         0x20
  191 #define         BPF_IND         0x40
  192 #define         BPF_MEM         0x60
  193 #define         BPF_LEN         0x80
  194 #define         BPF_MSH         0xa0
  195 
  196 /* alu/jmp fields */
  197 #define BPF_OP(code)    ((code) & 0xf0)
  198 #define         BPF_ADD         0x00
  199 #define         BPF_SUB         0x10
  200 #define         BPF_MUL         0x20
  201 #define         BPF_DIV         0x30
  202 #define         BPF_OR          0x40
  203 #define         BPF_AND         0x50
  204 #define         BPF_LSH         0x60
  205 #define         BPF_RSH         0x70
  206 #define         BPF_NEG         0x80
  207 #define         BPF_JA          0x00
  208 #define         BPF_JEQ         0x10
  209 #define         BPF_JGT         0x20
  210 #define         BPF_JGE         0x30
  211 #define         BPF_JSET        0x40
  212 #define BPF_SRC(code)   ((code) & 0x08)
  213 #define         BPF_K           0x00
  214 #define         BPF_X           0x08
  215 
  216 /* ret - BPF_K and BPF_X also apply */
  217 #define BPF_RVAL(code)  ((code) & 0x18)
  218 #define         BPF_A           0x10
  219 
  220 /* misc */
  221 #define BPF_MISCOP(code) ((code) & 0xf8)
  222 #define         BPF_TAX         0x00
  223 #define         BPF_TXA         0x80
  224 
  225 /*
  226  * The instruction data structure.
  227  */
  228 struct bpf_insn {
  229         uint16_t  code;
  230         u_char    jt;
  231         u_char    jf;
  232         uint32_t  k;
  233 };
  234 
  235 /*
  236  * Macros for insn array initializers.
  237  */
  238 #define BPF_STMT(code, k) { (uint16_t)(code), 0, 0, k }
  239 #define BPF_JUMP(code, k, jt, jf) { (uint16_t)(code), jt, jf, k }
  240 
  241 /*
  242  * Structure to retrieve available DLTs for the interface.
  243  */
  244 struct bpf_dltlist {
  245         u_int   bfl_len;        /* number of bfd_list array */
  246         u_int   *bfl_list;      /* array of DLTs */
  247 };
  248 
  249 #ifdef _KERNEL
  250 int      bpf_validate(struct bpf_insn *, int);
  251 void     bpf_tap(void *, u_char *, u_int);
  252 void     bpf_mtap(void *, struct mbuf *);
  253 void     bpf_mtap2(void *, void *, u_int, struct mbuf *);
  254 void     bpf_mtap_af(void *, uint32_t, struct mbuf *);
  255 void     bpf_mtap_et(void *, uint16_t, struct mbuf *);
  256 void     bpf_mtap_sl_in(void *, u_char *, struct mbuf **);
  257 void     bpf_mtap_sl_out(void *, u_char *, struct mbuf *);
  258 void     bpfattach(struct ifnet *, u_int, u_int);
  259 void     bpfattach2(struct ifnet *, u_int, u_int, void *);
  260 void     bpfdetach(struct ifnet *);
  261 void     bpf_change_type(struct ifnet *, u_int, u_int);
  262 void     bpfilterattach(int);
  263 #endif
  264 
  265 u_int    bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
  266 
  267 /*
  268  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
  269  */
  270 #define BPF_MEMWORDS 16
  271 
  272 #endif /* !_NET_BPF_H_ */

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