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  * $FreeBSD$
   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         .rcvdataq =     ng_hub_rcvdata,
   49         .disconnect =   ng_hub_disconnect,
   50 };
   51 NETGRAPH_INIT(hub, &ng_hub_typestruct);
   52 
   53 
   54 static int
   55 ng_hub_constructor(node_p *nodep)
   56 {
   57 
   58         /* Call the generic node constructor. */
   59         return (ng_make_node_common(&ng_hub_typestruct, nodep));
   60 }
   61 
   62 static int
   63 ng_hub_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
   64 {
   65         const node_p node = NG_HOOK_NODE(hook);
   66         int error = 0;
   67         hook_p hook2;
   68         struct mbuf *m2;
   69         meta_p meta2;
   70         int nhooks;
   71 
   72         if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
   73                 NG_FREE_DATA(m, meta);
   74                 return (0);
   75         }
   76         LIST_FOREACH(hook2, &node->hooks, hooks) {
   77                 if (hook2 == hook)
   78                         continue;
   79                 if (--nhooks == 1)
   80                         NG_SEND_DATA(error, hook2, m, meta);
   81                 else {
   82                         if ((m2 = m_dup(m, M_DONTWAIT)) == NULL) {
   83                                 NG_FREE_DATA(m, meta);
   84                                 return (ENOBUFS);
   85                         }
   86                         if (meta != NULL) {
   87                                 if ((meta2 = ng_copy_meta(meta)) == NULL) {
   88                                         m_freem(m2);
   89                                         NG_FREE_DATA(m, meta);
   90                                         return (ENOMEM);
   91                                 }
   92                         } else
   93                                 meta2 = NULL;
   94                         NG_SEND_DATA(error, hook2, m2, meta2);
   95                         if (error)
   96                                 continue;       /* don't give up */
   97                 }
   98         }
   99         return (error);
  100 }
  101 
  102 static int
  103 ng_hub_disconnect(hook_p hook)
  104 {
  105 
  106         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  107             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  108                 ng_rmnode(NG_HOOK_NODE(hook));
  109         return (0);
  110 }

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

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