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_hub.c

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    1 /*-
    2  * Copyright (c) 2004 Ruslan Ermilov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/6.0/sys/netgraph/ng_hub.c 131155 2004-06-26 22:24:16Z julian $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/errno.h>
   31 #include <sys/kernel.h>
   32 #include <sys/mbuf.h>
   33 #include <sys/systm.h>
   34 
   35 #include <netgraph/ng_message.h>
   36 #include <netgraph/ng_hub.h>
   37 #include <netgraph/netgraph.h>
   38 
   39 static ng_constructor_t ng_hub_constructor;
   40 static ng_rcvdata_t     ng_hub_rcvdata;
   41 static ng_disconnect_t  ng_hub_disconnect;
   42 
   43 static struct ng_type ng_hub_typestruct = {
   44         .version =      NG_ABI_VERSION,
   45         .name =         NG_HUB_NODE_TYPE,
   46         .constructor =  ng_hub_constructor,
   47         .rcvdata =      ng_hub_rcvdata,
   48         .disconnect =   ng_hub_disconnect,
   49 };
   50 NETGRAPH_INIT(hub, &ng_hub_typestruct);
   51 
   52 
   53 static int
   54 ng_hub_constructor(node_p node)
   55 {
   56 
   57         return (0);
   58 }
   59 
   60 static int
   61 ng_hub_rcvdata(hook_p hook, item_p item)
   62 {
   63         const node_p node = NG_HOOK_NODE(hook);
   64         int error = 0;
   65         hook_p hook2;
   66         struct mbuf * const m = NGI_M(item), *m2;
   67         int nhooks;
   68 
   69         if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
   70                 NG_FREE_ITEM(item);
   71                 return (0);
   72         }
   73         LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
   74                 if (hook2 == hook)
   75                         continue;
   76                 if (--nhooks == 1)
   77                         NG_FWD_ITEM_HOOK(error, item, hook2);
   78                 else {
   79                         if ((m2 = m_dup(m, M_DONTWAIT)) == NULL) {
   80                                 NG_FREE_ITEM(item);
   81                                 return (ENOBUFS);
   82                         }
   83                         NG_SEND_DATA_ONLY(error, hook2, m2);
   84                         if (error)
   85                                 continue;       /* don't give up */
   86                 }
   87         }
   88 
   89         return (error);
   90 }
   91 
   92 static int
   93 ng_hub_disconnect(hook_p hook)
   94 {
   95 
   96         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
   97             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
   98                 ng_rmnode_self(NG_HOOK_NODE(hook));
   99         return (0);
  100 }

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