sys/netgraph7/ng_hub.c

   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: src/sys/netgraph/ng_hub.c,v 1.3 2004/06/26 22:24:16 julian Exp $
  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 }