Main Page | Data Structures | File List | Data Fields | Globals

# bpf.h

    00001 /*-
    00002  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
    00003  *  The Regents of the University of California.  All rights reserved.
    00004  *
    00005  * This code is derived from the Stanford/CMU enet packet filter,
    00006  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
    00007  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
    00008  * Berkeley Laboratory.
    00009  *
    00010  * Redistribution and use in source and binary forms, with or without
    00011  * modification, are permitted provided that the following conditions
    00012  * are met:
    00013  * 1. Redistributions of source code must retain the above copyright
    00014  *    notice, this list of conditions and the following disclaimer.
    00015  * 2. Redistributions in binary form must reproduce the above copyright
    00016  *    notice, this list of conditions and the following disclaimer in the
    00017  *    documentation and/or other materials provided with the distribution.
    00018  * 3. All advertising materials mentioning features or use of this software
    00019  *    must display the following acknowledgement:
    00020  *      This product includes software developed by the University of
    00021  *      California, Berkeley and its contributors.
    00022  * 4. Neither the name of the University nor the names of its contributors
    00023  *    may be used to endorse or promote products derived from this software
    00024  *    without specific prior written permission.
    00025  *
    00026  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    00027  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    00028  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    00029  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
    00030  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    00031  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    00032  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00033  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    00034  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    00035  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00036  * SUCH DAMAGE.
    00037  *
    00038  *      @(#)bpf.h       7.1 (Berkeley) 5/7/91
    00039  *
    00040  * @(#) $Header: /usr/local/CVS/libnet/include/bpf.h,v 1.1.1.1 2003/06/26 21:55:10 route Exp $ (LBL)
    00041  */
    00042
    00043 #ifndef BPF_MAJOR_VERSION
    00044
    00045 /* BSD style release date */
    00046 #define BPF_RELEASE 199606
    00047
    00048 typedef int bpf_int32;
    00049 typedef u_int bpf_u_int32;
    00050
    00051 /*
    00052  * Alignment macros.  BPF_WORDALIGN rounds up to the next
    00053  * even multiple of BPF_ALIGNMENT.
    00054  */
    00055 #define BPF_ALIGNMENT sizeof(bpf_int32)
    00056 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
    00057
    00058 #define BPF_MAXINSNS 512
    00059 #define BPF_MAXBUFSIZE 0x8000
    00060 #define BPF_MINBUFSIZE 32
    00061
    00062 /*
    00063  *  Structure for BIOCSETF.
    00064  */
    00065 struct bpf_program {
    00066     u_int bf_len;
    00067     struct bpf_insn *bf_insns;
    00068 };
    00069
    00070 /*
    00071  * Struct returned by BIOCGSTATS.
    00072  */
    00073 struct bpf_stat {
    00074     u_int bs_recv;      /* number of packets received */
    00075     u_int bs_drop;      /* number of packets dropped */
    00076 };
    00077
    00078 /*
    00079  * Struct return by BIOCVERSION.  This represents the version number of
    00080  * the filter language described by the instruction encodings below.
    00081  * bpf understands a program iff kernel_major == filter_major &&
    00082  * kernel_minor >= filter_minor, that is, if the value returned by the
    00083  * running kernel has the same major number and a minor number equal
    00084  * equal to or less than the filter being downloaded.  Otherwise, the
    00085  * results are undefined, meaning an error may be returned or packets
    00086  * may be accepted haphazardly.
    00087  * It has nothing to do with the source code version.
    00088  */
    00089 struct bpf_version {
    00090     u_short bv_major;
    00091     u_short bv_minor;
    00092 };
    00093 /* Current version number of filter architecture. */
    00094 #define BPF_MAJOR_VERSION 1
    00095 #define BPF_MINOR_VERSION 1
    00096
    00097 /*
    00098  * BPF ioctls
    00099  *
    00100  * The first set is for compatibility with Sun's pcc style
    00101  * header files.  If your using gcc, we assume that you
    00102  * have run fixincludes so the latter set should work.
    00103  */
    00104 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__)
    00105 #define BIOCGBLEN   _IOR(B,102, u_int)
    00106 #define BIOCSBLEN   _IOWR(B,102, u_int)
    00107 #define BIOCSETF    _IOW(B,103, struct bpf_program)
    00108 #define BIOCFLUSH   _IO(B,104)
    00109 #define BIOCPROMISC _IO(B,105)
    00110 #define BIOCGDLT    _IOR(B,106, u_int)
    00111 #define BIOCGETIF   _IOR(B,107, struct ifreq)
    00112 #define BIOCSETIF   _IOW(B,108, struct ifreq)
    00113 #define BIOCSRTIMEOUT   _IOW(B,109, struct timeval)
    00114 #define BIOCGRTIMEOUT   _IOR(B,110, struct timeval)
    00115 #define BIOCGSTATS  _IOR(B,111, struct bpf_stat)
    00116 #define BIOCIMMEDIATE   _IOW(B,112, u_int)
    00117 #define BIOCVERSION _IOR(B,113, struct bpf_version)
    00118 #define BIOCSTCPF   _IOW(B,114, struct bpf_program)
    00119 #define BIOCSUDPF   _IOW(B,115, struct bpf_program)
    00120 #else
    00121 #define BIOCGBLEN   _IOR('B',102, u_int)
    00122 #define BIOCSBLEN   _IOWR('B',102, u_int)
    00123 #define BIOCSETF    _IOW('B',103, struct bpf_program)
    00124 #define BIOCFLUSH   _IO('B',104)
    00125 #define BIOCPROMISC _IO('B',105)
    00126 #define BIOCGDLT    _IOR('B',106, u_int)
    00127 #define BIOCGETIF   _IOR('B',107, struct ifreq)
    00128 #define BIOCSETIF   _IOW('B',108, struct ifreq)
    00129 #define BIOCSRTIMEOUT   _IOW('B',109, struct timeval)
    00130 #define BIOCGRTIMEOUT   _IOR('B',110, struct timeval)
    00131 #define BIOCGSTATS  _IOR('B',111, struct bpf_stat)
    00132 #define BIOCIMMEDIATE   _IOW('B',112, u_int)
    00133 #define BIOCVERSION _IOR('B',113, struct bpf_version)
    00134 #define BIOCSTCPF   _IOW('B',114, struct bpf_program)
    00135 #define BIOCSUDPF   _IOW('B',115, struct bpf_program)
    00136 #endif
    00137
    00138 /*
    00139  * Structure prepended to each packet.
    00140  */
    00141 struct bpf_hdr {
    00142     struct timeval  bh_tstamp;  /* time stamp */
    00143     bpf_u_int32 bh_caplen;  /* length of captured portion */
    00144     bpf_u_int32 bh_datalen; /* original length of packet */
    00145     u_short     bh_hdrlen;  /* length of bpf header (this struct
    00146                        plus alignment padding) */
    00147 };
    00148 /*
    00149  * Because the structure above is not a multiple of 4 bytes, some compilers
    00150  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
    00151  * Only the kernel needs to know about it; applications use bh_hdrlen.
    00152  */
    00153 #ifdef KERNEL
    00154 #define SIZEOF_BPF_HDR 18
    00155 #endif
    00156
    00157 /*
    00158  * Data-link level type codes.
    00159  */
    00160 #define DLT_NULL    0   /* no link-layer encapsulation */
    00161 #define DLT_EN10MB  1   /* Ethernet (10Mb) */
    00162 #define DLT_EN3MB   2   /* Experimental Ethernet (3Mb) */
    00163 #define DLT_AX25    3   /* Amateur Radio AX.25 */
    00164 #define DLT_PRONET  4   /* Proteon ProNET Token Ring */
    00165 #define DLT_CHAOS   5   /* Chaos */
    00166 #define DLT_IEEE802 6   /* IEEE 802 Networks */
    00167 #define DLT_ARCNET  7   /* ARCNET */
    00168 #define DLT_SLIP    8   /* Serial Line IP */
    00169 #define DLT_PPP     9   /* Point-to-point Protocol */
    00170 #define DLT_FDDI    10  /* FDDI */
    00171 #define DLT_ATM_RFC1483 11  /* LLC/SNAP encapsulated atm */
    00172 #define DLT_RAW     12  /* raw IP */
    00173 #define DLT_SLIP_BSDOS  13  /* BSD/OS Serial Line IP */
    00174 #define DLT_PPP_BSDOS   14  /* BSD/OS Point-to-point Protocol */
    00175
    00176 /*
    00177  * The instruction encondings.
    00178  */
    00179 /* instruction classes */
    00180 #define BPF_CLASS(code) ((code) & 0x07)
    00181 #define     BPF_LD      0x00
    00182 #define     BPF_LDX     0x01
    00183 #define     BPF_ST      0x02
    00184 #define     BPF_STX     0x03
    00185 #define     BPF_ALU     0x04
    00186 #define     BPF_JMP     0x05
    00187 #define     BPF_RET     0x06
    00188 #define     BPF_MISC    0x07
    00189
    00190 /* ld/ldx fields */
    00191 #define BPF_SIZE(code)  ((code) & 0x18)
    00192 #define     BPF_W       0x00
    00193 #define     BPF_H       0x08
    00194 #define     BPF_B       0x10
    00195 #define BPF_MODE(code)  ((code) & 0xe0)
    00196 #define     BPF_IMM     0x00
    00197 #define     BPF_ABS     0x20
    00198 #define     BPF_IND     0x40
    00199 #define     BPF_MEM     0x60
    00200 #define     BPF_LEN     0x80
    00201 #define     BPF_MSH     0xa0
    00202
    00203 /* alu/jmp fields */
    00204 #define BPF_OP(code)    ((code) & 0xf0)
    00205 #define     BPF_ADD     0x00
    00206 #define     BPF_SUB     0x10
    00207 #define     BPF_MUL     0x20
    00208 #define     BPF_DIV     0x30
    00209 #define     BPF_OR      0x40
    00210 #define     BPF_AND     0x50
    00211 #define     BPF_LSH     0x60
    00212 #define     BPF_RSH     0x70
    00213 #define     BPF_NEG     0x80
    00214 #define     BPF_JA      0x00
    00215 #define     BPF_JEQ     0x10
    00216 #define     BPF_JGT     0x20
    00217 #define     BPF_JGE     0x30
    00218 #define     BPF_JSET    0x40
    00219 #define BPF_SRC(code)   ((code) & 0x08)
    00220 #define     BPF_K       0x00
    00221 #define     BPF_X       0x08
    00222
    00223 /* ret - BPF_K and BPF_X also apply */
    00224 #define BPF_RVAL(code)  ((code) & 0x18)
    00225 #define     BPF_A       0x10
    00226
    00227 /* misc */
    00228 #define BPF_MISCOP(code) ((code) & 0xf8)
    00229 #define     BPF_TAX     0x00
    00230 #define     BPF_TXA     0x80
    00231
    00232 /*
    00233  * The instruction data structure.
    00234  */
    00235 struct bpf_insn {
    00236     u_short code;
    00237     u_char  jt;
    00238     u_char  jf;
    00239     bpf_int32 k;
    00240 };
    00241
    00242 /*
    00243  * Macros for insn array initializers.
    00244  */
    00245 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
    00246 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
    00247
    00248 #ifdef KERNEL
    00249 extern u_int bpf_filter();
    00250 extern void bpfattach();
    00251 extern void bpf_tap();
    00252 extern void bpf_mtap();
    00253 #else
    00254 #if __STDC__
    00255 extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
    00256 #endif
    00257 #endif
    00258
    00259 /*
    00260  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
    00261  */
    00262 #define BPF_MEMWORDS 16
    00263
    00264 #endif