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Annotation of XNU/bsd/net/bpf.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1990, 1991, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * This code is derived from the Stanford/CMU enet packet filter,
        !            27:  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
        !            28:  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
        !            29:  * Berkeley Laboratory.
        !            30:  *
        !            31:  * Redistribution and use in source and binary forms, with or without
        !            32:  * modification, are permitted provided that the following conditions
        !            33:  * are met:
        !            34:  * 1. Redistributions of source code must retain the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer.
        !            36:  * 2. Redistributions in binary form must reproduce the above copyright
        !            37:  *    notice, this list of conditions and the following disclaimer in the
        !            38:  *    documentation and/or other materials provided with the distribution.
        !            39:  * 3. All advertising materials mentioning features or use of this software
        !            40:  *    must display the following acknowledgement:
        !            41:  *     This product includes software developed by the University of
        !            42:  *     California, Berkeley and its contributors.
        !            43:  * 4. Neither the name of the University nor the names of its contributors
        !            44:  *    may be used to endorse or promote products derived from this software
        !            45:  *    without specific prior written permission.
        !            46:  *
        !            47:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            48:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            49:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            50:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            51:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            52:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            53:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            54:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            55:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            56:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            57:  * SUCH DAMAGE.
        !            58:  *
        !            59:  *      @(#)bpf.h      8.1 (Berkeley) 6/10/93
        !            60:  *     @(#)bpf.h       1.34 (LBL)     6/16/96
        !            61:  *
        !            62:  */
        !            63: 
        !            64: #ifndef _NET_BPF_H_
        !            65: #define _NET_BPF_H_
        !            66: 
        !            67: /* BSD style release date */
        !            68: #define        BPF_RELEASE 199606
        !            69: 
        !            70: typedef        int32_t   bpf_int32;
        !            71: typedef        u_int32_t bpf_u_int32;
        !            72: 
        !            73: /*
        !            74:  * Alignment macros.  BPF_WORDALIGN rounds up to the next
        !            75:  * even multiple of BPF_ALIGNMENT.
        !            76:  */
        !            77: #define BPF_ALIGNMENT sizeof(long)
        !            78: #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
        !            79: 
        !            80: #define BPF_MAXINSNS 512
        !            81: #define BPF_MAXBUFSIZE 0x8000
        !            82: #define BPF_MINBUFSIZE 32
        !            83: 
        !            84: 
        !            85: /*
        !            86:  *  Structure for BIOCSETF.
        !            87:  */
        !            88: struct bpf_program {
        !            89:        u_int bf_len;
        !            90:        struct bpf_insn *bf_insns;
        !            91: };
        !            92: 
        !            93: /*
        !            94:  * Struct returned by BIOCGSTATS.
        !            95:  */
        !            96: struct bpf_stat {
        !            97:        u_int bs_recv;          /* number of packets received */
        !            98:        u_int bs_drop;          /* number of packets dropped */
        !            99: };
        !           100: 
        !           101: /*
        !           102:  * Struct return by BIOCVERSION.  This represents the version number of
        !           103:  * the filter language described by the instruction encodings below.
        !           104:  * bpf understands a program iff kernel_major == filter_major &&
        !           105:  * kernel_minor >= filter_minor, that is, if the value returned by the
        !           106:  * running kernel has the same major number and a minor number equal
        !           107:  * equal to or less than the filter being downloaded.  Otherwise, the
        !           108:  * results are undefined, meaning an error may be returned or packets
        !           109:  * may be accepted haphazardly.
        !           110:  * It has nothing to do with the source code version.
        !           111:  */
        !           112: struct bpf_version {
        !           113:        u_short bv_major;
        !           114:        u_short bv_minor;
        !           115: };
        !           116: /* Current version number of filter architecture. */
        !           117: #define BPF_MAJOR_VERSION 1
        !           118: #define BPF_MINOR_VERSION 1
        !           119: 
        !           120: #define        BIOCGBLEN       _IOR('B',102, u_int)
        !           121: #define        BIOCSBLEN       _IOWR('B',102, u_int)
        !           122: #define        BIOCSETF        _IOW('B',103, struct bpf_program)
        !           123: #define        BIOCFLUSH       _IO('B',104)
        !           124: #define BIOCPROMISC    _IO('B',105)
        !           125: #define        BIOCGDLT        _IOR('B',106, u_int)
        !           126: #define BIOCGETIF      _IOR('B',107, struct ifreq)
        !           127: #define BIOCSETIF      _IOW('B',108, struct ifreq)
        !           128: #define BIOCSRTIMEOUT  _IOW('B',109, struct timeval)
        !           129: #define BIOCGRTIMEOUT  _IOR('B',110, struct timeval)
        !           130: #define BIOCGSTATS     _IOR('B',111, struct bpf_stat)
        !           131: #define BIOCIMMEDIATE  _IOW('B',112, u_int)
        !           132: #define BIOCVERSION    _IOR('B',113, struct bpf_version)
        !           133: #define BIOCGRSIG      _IOR('B',114, u_int)
        !           134: #define BIOCSRSIG      _IOW('B',115, u_int)
        !           135: 
        !           136: /*
        !           137:  * Structure prepended to each packet.
        !           138:  */
        !           139: struct bpf_hdr {
        !           140:        struct timeval  bh_tstamp;      /* time stamp */
        !           141:        bpf_u_int32     bh_caplen;      /* length of captured portion */
        !           142:        bpf_u_int32     bh_datalen;     /* original length of packet */
        !           143:        u_short         bh_hdrlen;      /* length of bpf header (this struct
        !           144:                                           plus alignment padding) */
        !           145: };
        !           146: /*
        !           147:  * Because the structure above is not a multiple of 4 bytes, some compilers
        !           148:  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
        !           149:  * Only the kernel needs to know about it; applications use bh_hdrlen.
        !           150:  */
        !           151: #ifdef KERNEL
        !           152: #define        SIZEOF_BPF_HDR  (sizeof(struct bpf_hdr) <= 20 ? 18 : \
        !           153:     sizeof(struct bpf_hdr))
        !           154: #endif
        !           155: 
        !           156: /*
        !           157:  * Data-link level type codes.
        !           158:  */
        !           159: #define DLT_NULL       0       /* no link-layer encapsulation */
        !           160: #define DLT_EN10MB     1       /* Ethernet (10Mb) */
        !           161: #define DLT_EN3MB      2       /* Experimental Ethernet (3Mb) */
        !           162: #define DLT_AX25       3       /* Amateur Radio AX.25 */
        !           163: #define DLT_PRONET     4       /* Proteon ProNET Token Ring */
        !           164: #define DLT_CHAOS      5       /* Chaos */
        !           165: #define DLT_IEEE802    6       /* IEEE 802 Networks */
        !           166: #define DLT_ARCNET     7       /* ARCNET */
        !           167: #define DLT_SLIP       8       /* Serial Line IP */
        !           168: #define DLT_PPP                9       /* Point-to-point Protocol */
        !           169: #define DLT_FDDI       10      /* FDDI */
        !           170: #define DLT_ATM_RFC1483        11      /* LLC/SNAP encapsulated atm */
        !           171: #define DLT_RAW                12      /* raw IP */
        !           172: #define DLT_SLIP_BSDOS 13      /* BSD/OS Serial Line IP */
        !           173: #define DLT_PPP_BSDOS  14      /* BSD/OS Point-to-point Protocol */
        !           174: 
        !           175: /*
        !           176:  * The instruction encodings.
        !           177:  */
        !           178: /* instruction classes */
        !           179: #define BPF_CLASS(code) ((code) & 0x07)
        !           180: #define                BPF_LD          0x00
        !           181: #define                BPF_LDX         0x01
        !           182: #define                BPF_ST          0x02
        !           183: #define                BPF_STX         0x03
        !           184: #define                BPF_ALU         0x04
        !           185: #define                BPF_JMP         0x05
        !           186: #define                BPF_RET         0x06
        !           187: #define                BPF_MISC        0x07
        !           188: 
        !           189: /* ld/ldx fields */
        !           190: #define BPF_SIZE(code) ((code) & 0x18)
        !           191: #define                BPF_W           0x00
        !           192: #define                BPF_H           0x08
        !           193: #define                BPF_B           0x10
        !           194: #define BPF_MODE(code) ((code) & 0xe0)
        !           195: #define                BPF_IMM         0x00
        !           196: #define                BPF_ABS         0x20
        !           197: #define                BPF_IND         0x40
        !           198: #define                BPF_MEM         0x60
        !           199: #define                BPF_LEN         0x80
        !           200: #define                BPF_MSH         0xa0
        !           201: 
        !           202: /* alu/jmp fields */
        !           203: #define BPF_OP(code)   ((code) & 0xf0)
        !           204: #define                BPF_ADD         0x00
        !           205: #define                BPF_SUB         0x10
        !           206: #define                BPF_MUL         0x20
        !           207: #define                BPF_DIV         0x30
        !           208: #define                BPF_OR          0x40
        !           209: #define                BPF_AND         0x50
        !           210: #define                BPF_LSH         0x60
        !           211: #define                BPF_RSH         0x70
        !           212: #define                BPF_NEG         0x80
        !           213: #define                BPF_JA          0x00
        !           214: #define                BPF_JEQ         0x10
        !           215: #define                BPF_JGT         0x20
        !           216: #define                BPF_JGE         0x30
        !           217: #define                BPF_JSET        0x40
        !           218: #define BPF_SRC(code)  ((code) & 0x08)
        !           219: #define                BPF_K           0x00
        !           220: #define                BPF_X           0x08
        !           221: 
        !           222: /* ret - BPF_K and BPF_X also apply */
        !           223: #define BPF_RVAL(code) ((code) & 0x18)
        !           224: #define                BPF_A           0x10
        !           225: 
        !           226: /* misc */
        !           227: #define BPF_MISCOP(code) ((code) & 0xf8)
        !           228: #define                BPF_TAX         0x00
        !           229: #define                BPF_TXA         0x80
        !           230: 
        !           231: /*
        !           232:  * The instruction data structure.
        !           233:  */
        !           234: struct bpf_insn {
        !           235:        u_short         code;
        !           236:        u_char          jt;
        !           237:        u_char          jf;
        !           238:        bpf_u_int32     k;
        !           239: };
        !           240: 
        !           241: /*
        !           242:  * Macros for insn array initializers.
        !           243:  */
        !           244: #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
        !           245: #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
        !           246: 
        !           247: #ifdef KERNEL
        !           248: int     bpf_validate __P((struct bpf_insn *, int));
        !           249: void    bpf_tap __P((struct ifnet *, u_char *, u_int));
        !           250: void    bpf_mtap __P((struct ifnet *, struct mbuf *));
        !           251: void    bpfattach __P(( struct ifnet *, u_int, u_int));
        !           252: void    bpfilterattach __P((int));
        !           253: u_int   bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int));
        !           254: #endif
        !           255: 
        !           256: /*
        !           257:  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
        !           258:  */
        !           259: #define BPF_MEMWORDS 16
        !           260: 
        !           261: #define BPF_TAP(x, y, z) bpf_tap(x,y,z) 
        !           262: #define BPF_MTAP(x, y) bpf_mtap(x, y)
        !           263: #endif

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