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Annotation of kernel/bsd/net/bpf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
        !            26: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            27: /*
        !            28:  * Copyright (c) 1990, 1991, 1993
        !            29:  *     The Regents of the University of California.  All rights reserved.
        !            30:  *
        !            31:  * This code is derived from the Stanford/CMU enet packet filter,
        !            32:  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
        !            33:  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 
        !            34:  * Berkeley Laboratory.
        !            35:  *
        !            36:  * Redistribution and use in source and binary forms, with or without
        !            37:  * modification, are permitted provided that the following conditions
        !            38:  * are met:
        !            39:  * 1. Redistributions of source code must retain the above copyright
        !            40:  *    notice, this list of conditions and the following disclaimer.
        !            41:  * 2. Redistributions in binary form must reproduce the above copyright
        !            42:  *    notice, this list of conditions and the following disclaimer in the
        !            43:  *    documentation and/or other materials provided with the distribution.
        !            44:  * 3. All advertising materials mentioning features or use of this software
        !            45:  *    must display the following acknowledgement:
        !            46:  *     This product includes software developed by the University of
        !            47:  *     California, Berkeley and its contributors.
        !            48:  * 4. Neither the name of the University nor the names of its contributors
        !            49:  *    may be used to endorse or promote products derived from this software
        !            50:  *    without specific prior written permission.
        !            51:  *
        !            52:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            53:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            54:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            55:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            56:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            57:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            58:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            59:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            60:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            61:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            62:  * SUCH DAMAGE.
        !            63:  *
        !            64:  *     @(#)bpf.c       8.4 (Berkeley) 1/9/95
        !            65:  */
        !            66: 
        !            67: #include "bpfilter.h"
        !            68: 
        !            69: #include <sys/param.h>
        !            70: #include <sys/systm.h>
        !            71: #include <sys/mbuf.h>
        !            72: #include <sys/buf.h>
        !            73: #include <sys/time.h>
        !            74: #include <sys/proc.h>
        !            75: #include <sys/user.h>
        !            76: #include <sys/ioctl.h>
        !            77: 
        !            78: #include <sys/file.h>
        !            79: #if defined(sparc) && BSD < 199103
        !            80: #include <sys/stream.h>
        !            81: #endif
        !            82: #include <sys/tty.h>
        !            83: #include <sys/uio.h>
        !            84: 
        !            85: #include <sys/protosw.h>
        !            86: #include <sys/socket.h>
        !            87: #include <net/if.h>
        !            88: 
        !            89: #include <net/bpf.h>
        !            90: #include <net/bpfdesc.h>
        !            91: 
        !            92: #include <sys/errno.h>
        !            93: 
        !            94: #include <netinet/in.h>
        !            95: #include <netinet/if_ether.h>
        !            96: #include <sys/kernel.h>
        !            97: 
        !            98: /*
        !            99:  * Older BSDs don't have kernel malloc.
        !           100:  */
        !           101: #if BSD < 199103
        !           102: extern bcopy();
        !           103: static caddr_t bpf_alloc();
        !           104: #include <net/bpf_compat.h>
        !           105: #define BPF_BUFSIZE (MCLBYTES-8)
        !           106: #define UIOMOVE(cp, len, code, uio) uiomove(cp, len, code, uio)
        !           107: #else
        !           108: #include <sys/malloc.h>
        !           109: #define BPF_BUFSIZE 4096
        !           110: #define UIOMOVE(cp, len, code, uio) uiomove(cp, len, uio)
        !           111: #endif
        !           112: 
        !           113: /*
        !           114:  * The default read buffer size is patchable.
        !           115:  */
        !           116: int bpf_bufsize = BPF_BUFSIZE;
        !           117: 
        !           118: /*
        !           119:  *  bpf_iflist is the list of interfaces; each corresponds to an ifnet
        !           120:  *  bpf_dtab holds the descriptors, indexed by minor device #
        !           121:  */
        !           122: struct bpf_if  *bpf_iflist;
        !           123: struct bpf_d   *bpf_dtab;
        !           124: int nbpfilter = -1;            /* Mark as uninitialized; BPF will init */
        !           125: 
        !           126: /*
        !           127:  * The kernel loadable server version of the BPF driver will
        !           128:  * intialize the bpf_ops object when it is loaded.
        !           129:  */
        !           130: bpfops_t bpfops;
        !           131: 
        !           132: /*
        !           133:  * Mark a descriptor free by making it point to itself.
        !           134:  * This is probably cheaper than marking with a constant since
        !           135:  * the address should be in a register anyway.
        !           136:  */
        !           137: #define D_ISFREE(d) ((d) == (d)->bd_next)
        !           138: #define D_MARKFREE(d) ((d)->bd_next = (d))
        !           139: #define D_MARKUSED(d) ((d)->bd_next = 0)
        !           140: 
        !           141: /*
        !           142:  * Attach an interface to bpf.  driverp is a pointer to a (struct bpf_if *)
        !           143:  * in the driver's softc; dlt is the link layer type; hdrlen is the fixed
        !           144:  * size of the link header (variable length headers not yet supported).
        !           145:  */
        !           146: void
        !           147: bpfattach(driverp, ifp, dlt, hdrlen)
        !           148:        caddr_t *driverp;
        !           149:        struct ifnet *ifp;
        !           150:        u_int dlt, hdrlen;
        !           151: {
        !           152:        struct bpf_if *bp;
        !           153:        int i;
        !           154:        bp = (struct bpf_if *)_MALLOC(sizeof(*bp), M_DEVBUF, M_DONTWAIT);
        !           155: 
        !           156:        if (bp == 0)
        !           157:                panic("bpfattach");
        !           158: 
        !           159:        bp->bif_dlist = 0;
        !           160:        bp->bif_driverp = (struct bpf_if **)driverp;
        !           161:        bp->bif_ifp = ifp;
        !           162:        bp->bif_dlt = dlt;
        !           163: 
        !           164:        bp->bif_next = bpf_iflist;
        !           165:        bpf_iflist = bp;
        !           166: 
        !           167:        *bp->bif_driverp = 0;
        !           168: 
        !           169:        /*
        !           170:         * Compute the length of the bpf header.  This is not necessarily
        !           171:         * equal to SIZEOF_BPF_HDR because we want to insert spacing such
        !           172:         * that the network layer header begins on a longword boundary (for
        !           173:         * performance reasons and to alleviate alignment restrictions).
        !           174:         */
        !           175:        bp->bif_hdrlen = BPF_WORDALIGN(hdrlen + SIZEOF_BPF_HDR) - hdrlen;
        !           176: 
        !           177: #if 0
        !           178:        printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);
        !           179: #endif
        !           180: }

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