The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_hole.c

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    1 
    2 /*
    3  * ng_hole.c
    4  *
    5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    6  * All rights reserved.
    7  * 
    8  * Subject to the following obligations and disclaimer of warranty, use and
    9  * redistribution of this software, in source or object code forms, with or
   10  * without modifications are expressly permitted by Whistle Communications;
   11  * provided, however, that:
   12  * 1. Any and all reproductions of the source or object code must include the
   13  *    copyright notice above and the following disclaimer of warranties; and
   14  * 2. No rights are granted, in any manner or form, to use Whistle
   15  *    Communications, Inc. trademarks, including the mark "WHISTLE
   16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   17  *    such appears in the above copyright notice or in the software.
   18  * 
   19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   35  * OF SUCH DAMAGE.
   36  *
   37  * Author: Julian Elisher <julian@freebsd.org>
   38  *
   39  * $FreeBSD: stable/3/sys/netgraph/ng_hole.c 67532 2000-10-24 22:45:12Z julian $
   40  * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 /*
   44  * This node is a 'black hole' that simply discards everything it receives
   45  */
   46 
   47 #include <sys/param.h>
   48 #include <sys/kernel.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mbuf.h>
   51 #include <netgraph/ng_message.h>
   52 #include <netgraph/netgraph.h>
   53 #include <netgraph/ng_hole.h>
   54 
   55 /* Netgraph methods */
   56 static ng_rcvdata_t     ngh_rcvdata;
   57 static ng_disconnect_t  ngh_disconnect;
   58 
   59 static struct ng_type typestruct = {
   60         NG_VERSION,
   61         NG_HOLE_NODE_TYPE,
   62         NULL,
   63         NULL,
   64         NULL,
   65         NULL,
   66         NULL,
   67         NULL,
   68         NULL,
   69         ngh_rcvdata,
   70         ngh_rcvdata,
   71         ngh_disconnect,
   72         NULL
   73 };
   74 NETGRAPH_INIT(hole, &typestruct);
   75 
   76 /*
   77  * Receive data
   78  */
   79 static int
   80 ngh_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
   81 {
   82         NG_FREE_DATA(m, meta);
   83         return 0;
   84 }
   85 
   86 /*
   87  * Hook disconnection
   88  */
   89 static int
   90 ngh_disconnect(hook_p hook)
   91 {
   92         if (hook->node->numhooks == 0)
   93                 ng_rmnode(hook->node);
   94         return (0);
   95 }

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