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Annotation of Net2/net/bpf.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * 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 of Lawrence Berkeley Laboratory.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *     This product includes software developed by the University of
        !            20:  *     California, Berkeley and its contributors.
        !            21:  * 4. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  *     @(#)bpf.h       7.1 (Berkeley) 5/7/91
        !            38:  *
        !            39:  * @(#) $Header: bpf.h,v 1.20 91/04/24 22:06:24 mccanne Locked $ (LBL)
        !            40:  */
        !            41: 
        !            42: /*
        !            43:  * Alignment macros.  BPF_WORDALIGN rounds up to the next 
        !            44:  * even multiple of BPF_ALIGNMENT. 
        !            45:  */
        !            46: #define BPF_ALIGNMENT sizeof(long)
        !            47: #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
        !            48: 
        !            49: #define BPF_MAXINSNS 512
        !            50: #define BPF_MAXBUFSIZE 0x8000
        !            51: 
        !            52: /*
        !            53:  *  Structure for BIOCSETF.
        !            54:  */
        !            55: struct bpf_program {
        !            56:        u_int bf_len;
        !            57:        struct bpf_insn *bf_insns;
        !            58: };
        !            59:  
        !            60: /*
        !            61:  * Struct returned by BIOCGSTATS.
        !            62:  */
        !            63: struct bpf_stat {
        !            64:        u_int bs_recv;          /* number of packets received */
        !            65:        u_int bs_drop;          /* number of packets dropped */
        !            66: };
        !            67: 
        !            68: /*
        !            69:  * BPF ioctls
        !            70:  *
        !            71:  * The first set is for compatibility with Sun's pcc style
        !            72:  * header files.  If your using gcc, we assume that you
        !            73:  * have run fixincludes so the latter set should work.
        !            74:  */
        !            75: #if defined(sun) && !defined(__GNUC__)
        !            76: #define        BIOCGFLEN       _IOR(B,101, u_int)
        !            77: #define        BIOCGBLEN       _IOR(B,102, u_int)
        !            78: #define        BIOCSETF        _IOW(B,103, struct bpf_program)
        !            79: #define        BIOCFLUSH       _IO(B,104)
        !            80: #define BIOCPROMISC    _IO(B,105)
        !            81: #define        BIOCGDLT        _IOR(B,106, u_int)
        !            82: #define BIOCGETIF      _IOR(B,107, struct ifreq)
        !            83: #define BIOCSETIF      _IOW(B,108, struct ifreq)
        !            84: #define BIOCSRTIMEOUT  _IOW(B,109, struct timeval)
        !            85: #define BIOCGRTIMEOUT  _IOR(B,110, struct timeval)
        !            86: #define BIOCGSTATS     _IOR(B,111, struct bpf_stat)
        !            87: #define BIOCIMMEDIATE  _IOW(B,112, u_int)
        !            88: #else
        !            89: #define        BIOCGFLEN       _IOR('B',101, u_int)
        !            90: #define        BIOCGBLEN       _IOR('B',102, u_int)
        !            91: #define        BIOCSETF        _IOW('B',103, struct bpf_program)
        !            92: #define        BIOCFLUSH       _IO('B',104)
        !            93: #define BIOCPROMISC    _IO('B',105)
        !            94: #define        BIOCGDLT        _IOR('B',106, u_int)
        !            95: #define BIOCGETIF      _IOR('B',107, struct ifreq)
        !            96: #define BIOCSETIF      _IOW('B',108, struct ifreq)
        !            97: #define BIOCSRTIMEOUT  _IOW('B',109, struct timeval)
        !            98: #define BIOCGRTIMEOUT  _IOR('B',110, struct timeval)
        !            99: #define BIOCGSTATS     _IOR('B',111, struct bpf_stat)
        !           100: #define BIOCIMMEDIATE  _IOW('B',112, u_int)
        !           101: #endif
        !           102: 
        !           103: /*
        !           104:  * Structure prepended to each packet.
        !           105:  */
        !           106: struct bpf_hdr {
        !           107:        struct timeval  bh_tstamp;      /* time stamp */
        !           108:        u_long          bh_caplen;      /* length of captured portion */
        !           109:        u_long          bh_datalen;     /* original length of packet */
        !           110:        u_short         bh_hdrlen;      /* length of bpf header (this struct
        !           111:                                           plus alignment padding) */
        !           112: };
        !           113: /*
        !           114:  * Because the structure above is not a multiple of 4 bytes, some compilers
        !           115:  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
        !           116:  * Only the kernel needs to know about it; applications use bh_hdrlen.
        !           117:  */
        !           118: #ifdef KERNEL
        !           119: #define SIZEOF_BPF_HDR 18
        !           120: #endif
        !           121: 
        !           122: /*
        !           123:  * Data-link level type codes.
        !           124:  * Currently, only DLT_EN10MB and DLT_SLIP are supported.
        !           125:  */
        !           126: #define DLT_EN10MB     1       /* Ethernet (10Mb) */
        !           127: #define DLT_EN3MB      2       /* Experimental Ethernet (3Mb) */
        !           128: #define DLT_AX25       3       /* Amateur Radio AX.25 */
        !           129: #define DLT_PRONET     4       /* Proteon ProNET Token Ring */
        !           130: #define DLT_CHAOS      5       /* Chaos */
        !           131: #define DLT_IEEE802    6       /* IEEE 802 Networks */
        !           132: #define DLT_ARCNET     7       /* ARCNET */
        !           133: #define DLT_SLIP       8       /* Serial Line IP */
        !           134: #define DLT_PPP                9       /* Point-to-point Protocol */
        !           135: #define DLT_FDDI       10      /* FDDI */
        !           136: 
        !           137: /*
        !           138:  * The instruction encondings.
        !           139:  */
        !           140: /* classes <2:0> */
        !           141: #define BPF_CLASS(code) ((code) & 0x07)
        !           142: #define                BPF_LD          0x00
        !           143: #define                BPF_LDX         0x01
        !           144: #define                BPF_ST          0x02
        !           145: #define                BPF_STX         0x03
        !           146: #define                BPF_ALU         0x04
        !           147: #define                BPF_JMP         0x05
        !           148: #define                BPF_RET         0x06
        !           149: #define                BPF_MISC        0x07
        !           150: 
        !           151: /* ld/ldx fields */
        !           152: #define BPF_SIZE(code) ((code) & 0x18)
        !           153: #define                BPF_W           0x00
        !           154: #define                BPF_H           0x08
        !           155: #define                BPF_B           0x10
        !           156: #define BPF_MODE(code) ((code) & 0xe0)
        !           157: #define                BPF_IMM         0x00
        !           158: #define                BPF_ABS         0x20
        !           159: #define                BPF_IND         0x40
        !           160: #define                BPF_MEM         0x60
        !           161: #define                BPF_LEN         0x80
        !           162: #define                BPF_MSH         0xa0
        !           163: 
        !           164: /* alu/jmp fields */
        !           165: #define BPF_OP(code)   ((code) & 0xf0)
        !           166: #define                BPF_ADD         0x00
        !           167: #define                BPF_SUB         0x10
        !           168: #define                BPF_MUL         0x20
        !           169: #define                BPF_DIV         0x30
        !           170: #define                BPF_OR          0x40
        !           171: #define                BPF_AND         0x50
        !           172: #define                BPF_LSH         0x60
        !           173: #define                BPF_RSH         0x70
        !           174: #define                BPF_NEG         0x80
        !           175: #define                BPF_JA          0x00
        !           176: #define                BPF_JEQ         0x10
        !           177: #define                BPF_JGT         0x20
        !           178: #define                BPF_JGE         0x30
        !           179: #define                BPF_JSET        0x40
        !           180: #define BPF_SRC(code)  ((code) & 0x08)
        !           181: #define                BPF_K           0x00
        !           182: #define                BPF_X           0x08
        !           183: 
        !           184: /* ret - BPF_K and BPF_X also apply */
        !           185: #define BPF_RVAL(code) ((code) & 0x18)
        !           186: #define                BPF_A           0x10
        !           187: 
        !           188: /* misc */
        !           189: #define BPF_MISCOP(code) ((code) & 0xf8)
        !           190: #define                BPF_TAX         0x00
        !           191: #define                BPF_TXA         0x80
        !           192: 
        !           193: /*
        !           194:  * The instruction data structure.
        !           195:  */
        !           196: struct bpf_insn {
        !           197:        u_short code;
        !           198:        u_char  jt;
        !           199:        u_char  jf;
        !           200:        long    k;
        !           201: };
        !           202: 
        !           203: /*
        !           204:  * Macros for insn array initializers.
        !           205:  */
        !           206: #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
        !           207: #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
        !           208: 
        !           209: #ifdef KERNEL
        !           210: extern u_int bpf_filter();
        !           211: extern void bpfattach();
        !           212: extern void bpf_tap();
        !           213: extern void bpf_mtap();
        !           214: #endif
        !           215: 
        !           216: /*
        !           217:  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
        !           218:  */
        !           219: #define BPF_MEMWORDS 16

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