bpfdesc.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from the Stanford/CMU enet packet filter,
    8  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
    9  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
   10  * Berkeley Laboratory.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)bpfdesc.h   8.1 (Berkeley) 6/10/93
   37  *
   38  * $FreeBSD$
   39  */
   40 
   41 #ifndef _NET_BPFDESC_H_
   42 #define _NET_BPFDESC_H_
   43 
   44 #include <sys/callout.h>
   45 #include <sys/selinfo.h>
   46 #include <sys/ck.h>
   47 #include <sys/conf.h>
   48 #include <sys/counter.h>
   49 #include <sys/epoch.h>
   50 #include <net/if.h>
   51 
   52 /*
   53  * Descriptor associated with each open bpf file.
   54  */
   55 struct zbuf;
   56 struct bpf_d {
   57         CK_LIST_ENTRY(bpf_d) bd_next;   /* Linked list of descriptors */
   58         /*
   59          * Buffer slots: two memory buffers store the incoming packets.
   60          *   The model has three slots.  Sbuf is always occupied.
   61          *   sbuf (store) - Receive interrupt puts packets here.
   62          *   hbuf (hold) - When sbuf is full, put buffer here and
   63          *                 wakeup read (replace sbuf with fbuf).
   64          *   fbuf (free) - When read is done, put buffer here.
   65          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
   66          */
   67         caddr_t         bd_sbuf;        /* store slot */
   68         caddr_t         bd_hbuf;        /* hold slot */
   69         caddr_t         bd_fbuf;        /* free slot */
   70         int             bd_hbuf_in_use; /* don't rotate buffers */
   71         int             bd_slen;        /* current length of store buffer */
   72         int             bd_hlen;        /* current length of hold buffer */
   73 
   74         int             bd_bufsize;     /* absolute length of buffers */
   75 
   76         struct bpf_if * bd_bif;         /* interface descriptor */
   77         u_long          bd_rtout;       /* Read timeout in 'ticks' */
   78         struct bpf_insn *bd_rfilter;    /* read filter code */
   79         struct bpf_insn *bd_wfilter;    /* write filter code */
   80         void            *bd_bfilter;    /* binary filter code */
   81         counter_u64_t   bd_rcount;      /* number of packets received */
   82         counter_u64_t   bd_dcount;      /* number of packets dropped */
   83 
   84         u_char          bd_promisc;     /* true if listening promiscuously */
   85         u_char          bd_state;       /* idle, waiting, or timed out */
   86         u_char          bd_immediate;   /* true to return on packet arrival */
   87         u_char          bd_writer;      /* non-zero if d is writer-only */
   88         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
   89         int             bd_direction;   /* select packet direction */
   90         int             bd_tstamp;      /* select time stamping function */
   91         int             bd_feedback;    /* true to feed back sent packets */
   92         int             bd_async;       /* non-zero if packet reception should generate signal */
   93         int             bd_sig;         /* signal to send upon packet reception */
   94         int             bd_pcp;         /* VLAN pcp tag */
   95         struct sigio *  bd_sigio;       /* information for async I/O */
   96         struct selinfo  bd_sel;         /* bsd select info */
   97         struct mtx      bd_lock;        /* per-descriptor lock */
   98         struct callout  bd_callout;     /* for BPF timeouts with select */
   99         struct label    *bd_label;      /* MAC label for descriptor */
  100         counter_u64_t   bd_fcount;      /* number of packets which matched filter */
  101         pid_t           bd_pid;         /* PID which created descriptor */
  102         int             bd_locked;      /* true if descriptor is locked */
  103         u_int           bd_bufmode;     /* Current buffer mode. */
  104         counter_u64_t   bd_wcount;      /* number of packets written */
  105         counter_u64_t   bd_wfcount;     /* number of packets that matched write filter */
  106         counter_u64_t   bd_wdcount;     /* number of packets dropped during a write */
  107         counter_u64_t   bd_zcopy;       /* number of zero copy operations */
  108         u_char          bd_compat32;    /* 32-bit stream on LP64 system */
  109 
  110         volatile u_int  bd_refcnt;
  111         struct epoch_context epoch_ctx;
  112 };
  113 
  114 /* Values for bd_state */
  115 #define BPF_IDLE        0               /* no select in progress */
  116 #define BPF_WAITING     1               /* waiting for read timeout in select */
  117 #define BPF_TIMED_OUT   2               /* read timeout has expired in select */
  118 
  119 #define BPFD_LOCK(bd)           mtx_lock(&(bd)->bd_lock)
  120 #define BPFD_UNLOCK(bd)         mtx_unlock(&(bd)->bd_lock)
  121 #define BPFD_LOCK_ASSERT(bd)    mtx_assert(&(bd)->bd_lock, MA_OWNED)
  122 
  123 #define BPF_PID_REFRESH(bd, td) (bd)->bd_pid = (td)->td_proc->p_pid
  124 #define BPF_PID_REFRESH_CUR(bd) (bd)->bd_pid = curthread->td_proc->p_pid
  125 
  126 /*
  127  * External representation of the bpf descriptor
  128  */
  129 struct xbpf_d {
  130         u_int           bd_structsize;  /* Size of this structure. */
  131         u_char          bd_promisc;
  132         u_char          bd_immediate;
  133         u_char          __bd_pad[6];
  134         int             bd_hdrcmplt;
  135         int             bd_direction;
  136         int             bd_feedback;
  137         int             bd_async;
  138         u_int64_t       bd_rcount;
  139         u_int64_t       bd_dcount;
  140         u_int64_t       bd_fcount;
  141         int             bd_sig;
  142         int             bd_slen;
  143         int             bd_hlen;
  144         int             bd_bufsize;
  145         pid_t           bd_pid;
  146         char            bd_ifname[IFNAMSIZ];
  147         int             bd_locked;
  148         u_int64_t       bd_wcount;
  149         u_int64_t       bd_wfcount;
  150         u_int64_t       bd_wdcount;
  151         u_int64_t       bd_zcopy;
  152         int             bd_bufmode;
  153         /*
  154          * Allocate 4 64 bit unsigned integers for future expansion so we do
  155          * not have to worry about breaking the ABI.
  156          */
  157         u_int64_t       bd_spare[4];
  158 };
  159 
  160 #define BPFIF_FLAG_DYING        1       /* Reject new bpf consumers */
  161 
  162 #endif

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sys/net/bpfdesc.h