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

     
     /*
      * ng_hole.c
      *
      * Copyright (c) 1996-1999 Whistle Communications, Inc.
      * All rights reserved.
      * 
      * Subject to the following obligations and disclaimer of warranty, use and
      * redistribution of this software, in source or object code forms, with or
     * without modifications are expressly permitted by Whistle Communications;
     * provided, however, that:
     * 1. Any and all reproductions of the source or object code must include the
     *    copyright notice above and the following disclaimer of warranties; and
     * 2. No rights are granted, in any manner or form, to use Whistle
     *    Communications, Inc. trademarks, including the mark "WHISTLE
     *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
     *    such appears in the above copyright notice or in the software.
     * 
     * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
     * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
     * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
     * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
     * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
     * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
     * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
     * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
     * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
     * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
     * OF SUCH DAMAGE.
     *
     * Author: Julian Elisher <julian@freebsd.org>
     *
     * $FreeBSD: releng/5.1/sys/netgraph/ng_hole.c 70784 2001-01-08 05:34:06Z julian $
     * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
     */
    
    /*
     * This node is a 'black hole' that simply discards everything it receives
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <netgraph/ng_message.h>
    #include <netgraph/netgraph.h>
    #include <netgraph/ng_hole.h>
    
    /* Netgraph methods */
    static ng_constructor_t ngh_cons;
    static ng_rcvdata_t     ngh_rcvdata;
    static ng_disconnect_t  ngh_disconnect;
    
    static struct ng_type typestruct = {
            NG_ABI_VERSION,
            NG_HOLE_NODE_TYPE,
            NULL,           /* modeventhand_t */
            ngh_cons,       /* ng_constructor_t */
            NULL,           /* ng_rcvmsg_t */
            NULL,           /* ng_shutdown_t */
            NULL,           /* ng_newhook_t */
            NULL,           /* ng_findhook_t */
            NULL,           /* ng_connect_t */
            ngh_rcvdata,    /* ng_rcvdata_t */
            ngh_disconnect, /* ng_disconnect_t */
            NULL            /* ng_cmdlist */
    };
    NETGRAPH_INIT(hole, &typestruct);
    
    /* 
     * Be obliging. but no work to do.
     */
    static int
    ngh_cons(node_p node)
    {
            return(0);
    }
    
    /*
     * Receive data
     */
    static int
    ngh_rcvdata(hook_p hook, item_p item)
    {
            NG_FREE_ITEM(item);
            return 0;
    }
    
    /*
     * Hook disconnection
     */
    static int
   ngh_disconnect(hook_p hook)
   {
           if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
                   ng_rmnode_self(NG_HOOK_NODE(hook));
           return (0);
   }

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