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FreeBSD/Linux Kernel Cross Reference
sys/net/bpfdesc.h

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    1 /*-
    2  * Copyright (c) 1990, 1991, 1993
    3  *      The Regents of the University of California.  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 and Van Jacobson both of Lawrence
    8  * Berkeley Laboratory.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)bpfdesc.h   8.1 (Berkeley) 6/10/93
   35  *
   36  * $FreeBSD: src/sys/net/bpfdesc.h,v 1.27.2.2 2005/01/31 23:26:22 imp Exp $
   37  */
   38 
   39 #ifndef _NET_BPFDESC_H_
   40 #define _NET_BPFDESC_H_
   41 
   42 #include <sys/callout.h>
   43 #include <sys/selinfo.h>
   44 #include <sys/queue.h>
   45 
   46 /*
   47  * Descriptor associated with each open bpf file.
   48  */
   49 struct bpf_d {
   50         LIST_ENTRY(bpf_d) bd_next;      /* Linked list of descriptors */
   51         /*
   52          * Buffer slots: two mbuf clusters buffer the incoming packets.
   53          *   The model has three slots.  Sbuf is always occupied.
   54          *   sbuf (store) - Receive interrupt puts packets here.
   55          *   hbuf (hold) - When sbuf is full, put cluster here and
   56          *                 wakeup read (replace sbuf with fbuf).
   57          *   fbuf (free) - When read is done, put cluster here.
   58          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
   59          */
   60         caddr_t         bd_sbuf;        /* store slot */
   61         caddr_t         bd_hbuf;        /* hold slot */
   62         caddr_t         bd_fbuf;        /* free slot */
   63         int             bd_slen;        /* current length of store buffer */
   64         int             bd_hlen;        /* current length of hold buffer */
   65 
   66         int             bd_bufsize;     /* absolute length of buffers */
   67 
   68         struct bpf_if * bd_bif;         /* interface descriptor */
   69         u_long          bd_rtout;       /* Read timeout in 'ticks' */
   70         struct bpf_insn *bd_filter;     /* filter code */
   71         u_long          bd_rcount;      /* number of packets received */
   72         u_long          bd_dcount;      /* number of packets dropped */
   73 
   74         u_char          bd_promisc;     /* true if listening promiscuously */
   75         u_char          bd_state;       /* idle, waiting, or timed out */
   76         u_char          bd_immediate;   /* true to return on packet arrival */
   77         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
   78         int             bd_seesent;     /* true if bpf should see sent packets */
   79         int             bd_async;       /* non-zero if packet reception should generate signal */
   80         int             bd_sig;         /* signal to send upon packet reception */
   81         struct sigio *  bd_sigio;       /* information for async I/O */
   82 #if BSD < 199103
   83         u_char          bd_selcoll;     /* true if selects collide */
   84         int             bd_timedout;
   85         struct thread * bd_selthread;   /* process that last selected us */
   86 #else
   87         u_char          bd_pad;         /* explicit alignment */
   88         struct selinfo  bd_sel;         /* bsd select info */
   89 #endif
   90         struct mtx      bd_mtx;         /* mutex for this descriptor */
   91         struct callout  bd_callout;     /* for BPF timeouts with select */
   92         struct label    *bd_label;      /* MAC label for descriptor */
   93 };
   94 
   95 /* Values for bd_state */
   96 #define BPF_IDLE        0               /* no select in progress */
   97 #define BPF_WAITING     1               /* waiting for read timeout in select */
   98 #define BPF_TIMED_OUT   2               /* read timeout has expired in select */
   99 
  100 #define BPFD_LOCK(bd)           mtx_lock(&(bd)->bd_mtx)
  101 #define BPFD_UNLOCK(bd)         mtx_unlock(&(bd)->bd_mtx)
  102 #define BPFD_LOCK_ASSERT(bd)    do {                            \
  103         mtx_assert(&(bd)->bd_mtx, MA_OWNED);                    \
  104         NET_ASSERT_GIANT();                                     \
  105 } while (0)
  106 
  107 /* Test whether a BPF is ready for read(). */
  108 #define bpf_ready(bd)                                            \
  109         ((bd)->bd_hlen != 0 ||                                   \
  110          (((bd)->bd_immediate || (bd)->bd_state == BPF_TIMED_OUT) && \
  111           (bd)->bd_slen != 0))
  112 
  113 /*
  114  * Descriptor associated with each attached hardware interface.
  115  */
  116 struct bpf_if {
  117         LIST_ENTRY(bpf_if)      bif_next;       /* list of all interfaces */
  118         LIST_HEAD(, bpf_d)      bif_dlist;      /* descriptor list */
  119         struct bpf_if **bif_driverp;    /* pointer into softc */
  120         u_int bif_dlt;                  /* link layer type */
  121         u_int bif_hdrlen;               /* length of header (with padding) */
  122         struct ifnet *bif_ifp;          /* corresponding interface */
  123         struct mtx      bif_mtx;        /* mutex for interface */
  124 };
  125 
  126 #define BPFIF_LOCK(bif)         mtx_lock(&(bif)->bif_mtx)
  127 #define BPFIF_UNLOCK(bif)       mtx_unlock(&(bif)->bif_mtx)
  128 
  129 #endif

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