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: releng/5.2/sys/netgraph/ng_hole.c 70784 2001-01-08 05:34:06Z 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/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/mbuf.h>
   52 #include <netgraph/ng_message.h>
   53 #include <netgraph/netgraph.h>
   54 #include <netgraph/ng_hole.h>
   55 
   56 /* Netgraph methods */
   57 static ng_constructor_t ngh_cons;
   58 static ng_rcvdata_t     ngh_rcvdata;
   59 static ng_disconnect_t  ngh_disconnect;
   60 
   61 static struct ng_type typestruct = {
   62         NG_ABI_VERSION,
   63         NG_HOLE_NODE_TYPE,
   64         NULL,           /* modeventhand_t */
   65         ngh_cons,       /* ng_constructor_t */
   66         NULL,           /* ng_rcvmsg_t */
   67         NULL,           /* ng_shutdown_t */
   68         NULL,           /* ng_newhook_t */
   69         NULL,           /* ng_findhook_t */
   70         NULL,           /* ng_connect_t */
   71         ngh_rcvdata,    /* ng_rcvdata_t */
   72         ngh_disconnect, /* ng_disconnect_t */
   73         NULL            /* ng_cmdlist */
   74 };
   75 NETGRAPH_INIT(hole, &typestruct);
   76 
   77 /* 
   78  * Be obliging. but no work to do.
   79  */
   80 static int
   81 ngh_cons(node_p node)
   82 {
   83         return(0);
   84 }
   85 
   86 /*
   87  * Receive data
   88  */
   89 static int
   90 ngh_rcvdata(hook_p hook, item_p item)
   91 {
   92         NG_FREE_ITEM(item);
   93         return 0;
   94 }
   95 
   96 /*
   97  * Hook disconnection
   98  */
   99 static int
  100 ngh_disconnect(hook_p hook)
  101 {
  102         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  103                 ng_rmnode_self(NG_HOOK_NODE(hook));
  104         return (0);
  105 }

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