The Design and Implementation of the FreeBSD Operating System, Second Edition
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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: stable/8/sys/net/bpfdesc.h 247732 2013-03-03 21:48:40Z melifaro $
   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 #include <sys/conf.h>
   46 #include <net/if.h>
   47 
   48 /*
   49  * Descriptor associated with each open bpf file.
   50  */
   51 struct zbuf;
   52 struct bpf_d {
   53         LIST_ENTRY(bpf_d) bd_next;      /* Linked list of descriptors */
   54         /*
   55          * Buffer slots: two memory buffers store the incoming packets.
   56          *   The model has three slots.  Sbuf is always occupied.
   57          *   sbuf (store) - Receive interrupt puts packets here.
   58          *   hbuf (hold) - When sbuf is full, put buffer here and
   59          *                 wakeup read (replace sbuf with fbuf).
   60          *   fbuf (free) - When read is done, put buffer here.
   61          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
   62          */
   63         caddr_t         bd_sbuf;        /* store slot */
   64         caddr_t         bd_hbuf;        /* hold slot */
   65         caddr_t         bd_fbuf;        /* free slot */
   66         int             bd_slen;        /* current length of store buffer */
   67         int             bd_hlen;        /* current length of hold buffer */
   68 
   69         int             bd_bufsize;     /* absolute length of buffers */
   70 
   71         struct bpf_if * bd_bif;         /* interface descriptor */
   72         u_long          bd_rtout;       /* Read timeout in 'ticks' */
   73         struct bpf_insn *bd_rfilter;    /* read filter code */
   74         struct bpf_insn *bd_wfilter;    /* write filter code */
   75         void            *bd_bfilter;    /* binary filter code */
   76         u_int64_t       bd_rcount;      /* number of packets received */
   77         u_int64_t       bd_dcount;      /* number of packets dropped */
   78 
   79         u_char          bd_promisc;     /* true if listening promiscuously */
   80         u_char          bd_state;       /* idle, waiting, or timed out */
   81         u_char          bd_immediate;   /* true to return on packet arrival */
   82         u_char          bd_writer;      /* non-zero if d is writer-only */
   83         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
   84         int             bd_direction;   /* select packet direction */
   85         int             bd_feedback;    /* true to feed back sent packets */
   86         int             bd_async;       /* non-zero if packet reception should generate signal */
   87         int             bd_sig;         /* signal to send upon packet reception */
   88         struct sigio *  bd_sigio;       /* information for async I/O */
   89         struct selinfo  bd_sel;         /* bsd select info */
   90         struct mtx      bd_lock;        /* per-descriptor lock */
   91         struct callout  bd_callout;     /* for BPF timeouts with select */
   92         struct label    *bd_label;      /* MAC label for descriptor */
   93         u_int64_t       bd_fcount;      /* number of packets which matched filter */
   94         pid_t           bd_pid;         /* PID which created descriptor */
   95         int             bd_locked;      /* true if descriptor is locked */
   96         u_int           bd_bufmode;     /* Current buffer mode. */
   97         u_int64_t       bd_wcount;      /* number of packets written */
   98         u_int64_t       bd_wfcount;     /* number of packets that matched write filter */
   99         u_int64_t       bd_wdcount;     /* number of packets dropped during a write */
  100         u_int64_t       bd_zcopy;       /* number of zero copy operations */
  101         u_char          bd_compat32;    /* 32-bit stream on LP64 system */
  102 };
  103 
  104 /* Values for bd_state */
  105 #define BPF_IDLE        0               /* no select in progress */
  106 #define BPF_WAITING     1               /* waiting for read timeout in select */
  107 #define BPF_TIMED_OUT   2               /* read timeout has expired in select */
  108 
  109 #define BPFD_LOCK(bd)           mtx_lock(&(bd)->bd_lock)
  110 #define BPFD_UNLOCK(bd)         mtx_unlock(&(bd)->bd_lock)
  111 #define BPFD_LOCK_ASSERT(bd)    mtx_assert(&(bd)->bd_lock, MA_OWNED)
  112 
  113 #define BPF_PID_REFRESH(bd, td) (bd)->bd_pid = (td)->td_proc->p_pid
  114 #define BPF_PID_REFRESH_CUR(bd) (bd)->bd_pid = curthread->td_proc->p_pid
  115 
  116 #define BPF_LOCK()              mtx_lock(&bpf_mtx)
  117 #define BPF_UNLOCK()            mtx_unlock(&bpf_mtx)
  118 #define BPF_LOCK_ASSERT()       mtx_assert(&bpf_mtx, MA_OWNED)
  119 /*
  120  * External representation of the bpf descriptor
  121  */
  122 struct xbpf_d {
  123         u_int           bd_structsize;  /* Size of this structure. */
  124         u_char          bd_promisc;
  125         u_char          bd_immediate;
  126         u_char          __bd_pad[6];
  127         int             bd_hdrcmplt;
  128         int             bd_direction;
  129         int             bd_feedback;
  130         int             bd_async;
  131         u_int64_t       bd_rcount;
  132         u_int64_t       bd_dcount;
  133         u_int64_t       bd_fcount;
  134         int             bd_sig;
  135         int             bd_slen;
  136         int             bd_hlen;
  137         int             bd_bufsize;
  138         pid_t           bd_pid;
  139         char            bd_ifname[IFNAMSIZ];
  140         int             bd_locked;
  141         u_int64_t       bd_wcount;
  142         u_int64_t       bd_wfcount;
  143         u_int64_t       bd_wdcount;
  144         u_int64_t       bd_zcopy;
  145         int             bd_bufmode;
  146         /*
  147          * Allocate 4 64 bit unsigned integers for future expansion so we do
  148          * not have to worry about breaking the ABI.
  149          */
  150         u_int64_t       bd_spare[4];
  151 };
  152 
  153 #define BPFIF_RLOCK(bif)        rw_rlock(&(bif)->bif_lock)
  154 #define BPFIF_RUNLOCK(bif)      rw_runlock(&(bif)->bif_lock)
  155 #define BPFIF_WLOCK(bif)        rw_wlock(&(bif)->bif_lock)
  156 #define BPFIF_WUNLOCK(bif)      rw_wunlock(&(bif)->bif_lock)
  157 
  158 #define BPFIF_FLAG_DYING        1       /* Reject new bpf consumers */
  159 
  160 #endif

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