bsd/net/bpfdesc.h

   1 /*
   2  * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1990, 1991, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * This code is derived from the Stanford/CMU enet packet filter,
  33  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
  34  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
  35  * Berkeley Laboratory.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)bpfdesc.h   8.1 (Berkeley) 6/10/93
  66  *
  67  * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.1 2000/03/19 05:55:36 rwatson Exp $
  68  */
  69
  70 #ifndef _NET_BPFDESC_H_
  71 #define _NET_BPFDESC_H_
  72 #include <sys/appleapiopts.h>
  73 #ifdef KERNEL_PRIVATE
  74 /*
  75  * The items in this header file should be wrapped in #ifdef KERNEL.
  76  */
  77
  78 #include <sys/select.h>
  79 #include <kern/thread_call.h>
  80
  81 /*
  82  * Descriptor associated with each open bpf file.
  83  */
  84 struct bpf_d {
  85         struct bpf_d    *bd_next;       /* Linked list of descriptors */
  86         /*
  87          * Buffer slots: two mbuf clusters buffer the incoming packets.
  88          *   The model has three slots.  Sbuf is always occupied.
  89          *   sbuf (store) - Receive interrupt puts packets here.
  90          *   hbuf (hold) - When sbuf is full, put cluster here and
  91          *                 wakeup read (replace sbuf with fbuf).
  92          *   fbuf (free) - When read is done, put cluster here.
  93          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
  94          */
  95         caddr_t         bd_sbuf;        /* store slot */
  96         caddr_t         bd_hbuf;        /* hold slot */
  97         caddr_t         bd_fbuf;        /* free slot */
  98         int             bd_slen;        /* current length of store buffer */
  99         int             bd_hlen;        /* current length of hold buffer */
 100
 101         int             bd_bufsize;     /* absolute length of buffers */
 102
 103         struct bpf_if  *bd_bif;         /* interface descriptor */
 104         u_int32_t               bd_rtout;       /* Read timeout in 'ticks' */
 105         struct bpf_insn *bd_filter;     /* filter code */
 106         u_int32_t               bd_rcount;      /* number of packets received */
 107         u_int32_t               bd_dcount;      /* number of packets dropped */
 108
 109         u_char          bd_promisc;     /* true if listening promiscuously */
 110         u_char          bd_state;       /* idle, waiting, or timed out */
 111         u_char          bd_immediate;   /* true to return on packet arrival */
 112         int             bd_async;       /* non-zero if packet reception should generate signal */
 113         int             bd_sig;         /* signal to send upon packet reception */
 114 #ifdef __APPLE__
 115         pid_t           bd_sigio;
 116 #else
 117         struct sigio *  bd_sigio;       /* information for async I/O */
 118 #endif
 119
 120 #if BSD < 199103
 121         u_char          bd_selcoll;     /* true if selects collide */
 122         int             bd_timedout;
 123         struct proc *   bd_selproc;     /* process that last selected us */
 124 #else
 125         u_char          bd_pad;         /* explicit alignment */
 126         struct selinfo  bd_sel;         /* bsd select info */
 127 #endif
 128         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
 129         int             bd_seesent;     /* true if bpf should see sent packets */
 130         int             bd_oflags;      /* device open flags */
 131         thread_call_t bd_thread_call; /* for BPF timeouts with select */
 132 #if CONFIG_MACF_NET
 133         struct label *  bd_label;       /* MAC label for descriptor */
 134 #endif
 135         int             bd_traffic_class; /* traffic service class */
 136         int             bd_extendedhdr; /* process req. the extended header */
 137 };
 138
 139 /* Values for bd_state */
 140 #define BPF_IDLE                0    /* no select in progress or kqueue pending */
 141 #define BPF_WAITING             1    /* waiting for read timeout in select/kqueue */
 142 #define BPF_TIMED_OUT   2        /* read timeout has expired in select/kqueue */
 143 #define BPF_DRAINING    3        /* waiting for timeout routine to finish during close */
 144
 145 /* Test whether a BPF is ready for read(). */
 146 #define bpf_ready(bd)   ((bd)->bd_hlen != 0 ||          \
 147                          (((bd)->bd_immediate || (bd)->bd_state == BPF_TIMED_OUT) && \
 148                           (bd)->bd_slen != 0))
 149
 150
 151 /*
 152  * Descriptor associated with each attached hardware interface.
 153  */
 154 struct bpf_if {
 155         struct bpf_if *bif_next;        /* list of all interfaces */
 156         struct bpf_d *bif_dlist;        /* descriptor list */
 157         u_int bif_dlt;                  /* link layer type */
 158         u_int bif_hdrlen;               /* length of header (with padding) */
 159         u_int bif_exthdrlen;            /* length of ext header */
 160         struct ifnet *bif_ifp;          /* corresponding interface */
 161         bpf_send_func   bif_send;
 162         bpf_tap_func    bif_tap;
 163 };
 164
 165 #endif /* KERNEL_PRIVATE */
 166 #endif