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_echo.c

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    1 
    2 /*
    3  * ng_echo.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_echo.c 70784 2001-01-08 05:34:06Z julian $
   40  * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 /*
   44  * Netgraph "echo" node
   45  *
   46  * This node simply bounces data and messages back to whence they came.
   47  */
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mbuf.h>
   54 #include <netgraph/ng_message.h>
   55 #include <netgraph/netgraph.h>
   56 #include <netgraph/ng_echo.h>
   57 
   58 /* Netgraph methods */
   59 static ng_constructor_t nge_cons;
   60 static ng_rcvmsg_t      nge_rcvmsg;
   61 static ng_rcvdata_t     nge_rcvdata;
   62 static ng_disconnect_t  nge_disconnect;
   63 
   64 /* Netgraph type */
   65 static struct ng_type typestruct = {
   66         NG_ABI_VERSION,
   67         NG_ECHO_NODE_TYPE,
   68         NULL,
   69         nge_cons,
   70         nge_rcvmsg,
   71         NULL,
   72         NULL,
   73         NULL,
   74         NULL,
   75         nge_rcvdata,
   76         nge_disconnect,
   77         NULL
   78 };
   79 NETGRAPH_INIT(echo, &typestruct);
   80 
   81 static int
   82 nge_cons(node_p node)
   83 {
   84         return (0);
   85 }
   86 
   87 /*
   88  * Receive control message. We just bounce it back as a reply.
   89  */
   90 static int
   91 nge_rcvmsg(node_p node, item_p item, hook_p lasthook)
   92 {
   93         struct ng_mesg *msg;
   94         int error = 0;
   95 
   96         NGI_GET_MSG(item, msg);
   97         msg->header.flags |= NGF_RESP;
   98         NG_RESPOND_MSG(error, node, item, msg);
   99         return (error);
  100 }
  101 
  102 /*
  103  * Receive data
  104  */
  105 static int
  106 nge_rcvdata(hook_p hook, item_p item)
  107 {
  108         int error = 0;
  109 
  110         NG_FWD_ITEM_HOOK(error, item, hook);
  111         return (0);
  112 }
  113 
  114 /*
  115  * Removal of the last link destroys the nodeo
  116  */
  117 static int
  118 nge_disconnect(hook_p hook)
  119 {
  120         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  121         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  122                 ng_rmnode_self(NG_HOOK_NODE(hook));
  123         }
  124         return (0);
  125 }
  126 

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