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  * ng_echo.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  * 
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  * 
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Julian Elisher <julian@freebsd.org>
   39  *
   40  * $FreeBSD: releng/6.0/sys/netgraph/ng_echo.c 145101 2005-04-15 10:14:00Z glebius $
   41  * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 /*
   45  * Netgraph "echo" node
   46  *
   47  * This node simply bounces data and messages back to whence they came.
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/kernel.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mbuf.h>
   55 #include <netgraph/ng_message.h>
   56 #include <netgraph/netgraph.h>
   57 #include <netgraph/ng_echo.h>
   58 
   59 /* Netgraph methods */
   60 static ng_constructor_t nge_cons;
   61 static ng_rcvmsg_t      nge_rcvmsg;
   62 static ng_rcvdata_t     nge_rcvdata;
   63 static ng_disconnect_t  nge_disconnect;
   64 
   65 /* Netgraph type */
   66 static struct ng_type typestruct = {
   67         .version =      NG_ABI_VERSION,
   68         .name =         NG_ECHO_NODE_TYPE,
   69         .constructor =  nge_cons,
   70         .rcvmsg =       nge_rcvmsg,
   71         .rcvdata =      nge_rcvdata,
   72         .disconnect =   nge_disconnect,
   73 };
   74 NETGRAPH_INIT(echo, &typestruct);
   75 
   76 static int
   77 nge_cons(node_p node)
   78 {
   79         return (0);
   80 }
   81 
   82 /*
   83  * Receive control message. We just bounce it back as a reply.
   84  */
   85 static int
   86 nge_rcvmsg(node_p node, item_p item, hook_p lasthook)
   87 {
   88         struct ng_mesg *msg;
   89         int error = 0;
   90 
   91         NGI_GET_MSG(item, msg);
   92         msg->header.flags |= NGF_RESP;
   93         NG_RESPOND_MSG(error, node, item, msg);
   94         return (error);
   95 }
   96 
   97 /*
   98  * Receive data
   99  */
  100 static int
  101 nge_rcvdata(hook_p hook, item_p item)
  102 {
  103         int error;
  104 
  105         NG_FWD_ITEM_HOOK(error, item, hook);
  106         return (error);
  107 }
  108 
  109 /*
  110  * Removal of the last link destroys the nodeo
  111  */
  112 static int
  113 nge_disconnect(hook_p hook)
  114 {
  115         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  116         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  117                 ng_rmnode_self(NG_HOOK_NODE(hook));
  118         }
  119         return (0);
  120 }
  121 

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