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_ether_echo.c

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    1 /*
    2  * ng_ether_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/11.1/sys/netgraph/ng_ether_echo.c 186481 2008-12-25 00:01:29Z julian $
   41  * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 /*
   45  * Netgraph "ether_echo" node
   46  *
   47  * This node simply bounces data and messages back to whence they came.
   48  * However it swaps the source and destination ether fields.
   49  * No testing is done!
   50  */
   51 
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/kernel.h>
   55 #include <sys/malloc.h>
   56 #include <sys/mbuf.h>
   57 #include <netgraph/ng_message.h>
   58 #include <netgraph/netgraph.h>
   59 #include <netgraph/ng_ether_echo.h>
   60 
   61 #include <net/ethernet.h>
   62 
   63 /* Netgraph methods */
   64 static ng_constructor_t ngee_cons;
   65 static ng_rcvmsg_t      ngee_rcvmsg;
   66 static ng_rcvdata_t     ngee_rcvdata;
   67 static ng_disconnect_t  ngee_disconnect;
   68 
   69 /* Netgraph type */
   70 static struct ng_type typestruct = {
   71         .version =      NG_ABI_VERSION,
   72         .name =         NG_ETHER_ECHO_NODE_TYPE,
   73         .constructor =  ngee_cons,
   74         .rcvmsg =       ngee_rcvmsg,
   75         .rcvdata =      ngee_rcvdata,
   76         .disconnect =   ngee_disconnect,
   77 };
   78 NETGRAPH_INIT(ether_echo, &typestruct);
   79 
   80 static int
   81 ngee_cons(node_p node)
   82 {
   83         return (0);
   84 }
   85 
   86 /*
   87  * Receive control message. We just bounce it back as a reply.
   88  */
   89 static int
   90 ngee_rcvmsg(node_p node, item_p item, hook_p lasthook)
   91 {
   92         struct ng_mesg *msg;
   93         int error = 0;
   94 
   95         NGI_GET_MSG(item, msg);
   96         msg->header.flags |= NGF_RESP;
   97         NG_RESPOND_MSG(error, node, item, msg);
   98         return (error);
   99 }
  100 
  101 /*
  102  * Receive data
  103  */
  104 static int
  105 ngee_rcvdata(hook_p hook, item_p item)
  106 {
  107         int error;
  108         struct mbuf *m;
  109 
  110         struct ether_header *eh;
  111         struct ether_addr tmpaddr;
  112 
  113         /* Make sure we have an entire header */
  114         NGI_GET_M(item, m);
  115         if (m->m_len < sizeof(*eh) ) {
  116                 m = m_pullup(m, sizeof(*eh));
  117                 if (m == NULL) {
  118                         NG_FREE_ITEM(item);
  119                         return(EINVAL);
  120                 }
  121         }
  122         eh = mtod(m, struct ether_header *);
  123 
  124         /* swap the source and destination fields */
  125         bcopy(eh->ether_dhost, &tmpaddr, ETHER_ADDR_LEN);
  126         bcopy(eh->ether_shost, eh->ether_dhost, ETHER_ADDR_LEN);
  127         bcopy(&tmpaddr, eh->ether_shost, ETHER_ADDR_LEN);
  128 
  129         NG_FWD_NEW_DATA(error, item, hook, m);
  130         return (error);
  131 }
  132 
  133 /*
  134  * Removal of the last link destroys the nodeo
  135  */
  136 static int
  137 ngee_disconnect(hook_p hook)
  138 {
  139         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  140         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  141                 ng_rmnode_self(NG_HOOK_NODE(hook));
  142         }
  143         return (0);
  144 }
  145 

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