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  * $DragonFly: src/sys/netgraph7/ng_hub.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/errno.h>
  32 #include <sys/kernel.h>
  33 #include <sys/mbuf.h>
  34 #include <sys/systm.h>
  35
  36 #include "ng_message.h"
  37 #include "ng_hub.h"
  38 #include "netgraph.h"
  39
  40 static ng_constructor_t ng_hub_constructor;
  41 static ng_rcvdata_t     ng_hub_rcvdata;
  42 static ng_disconnect_t  ng_hub_disconnect;
  43
  44 static struct ng_type ng_hub_typestruct = {
  45         .version =      NG_ABI_VERSION,
  46         .name =         NG_HUB_NODE_TYPE,
  47         .constructor =  ng_hub_constructor,
  48         .rcvdata =      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 node)
  56 {
  57
  58         return (0);
  59 }
  60
  61 static int
  62 ng_hub_rcvdata(hook_p hook, item_p item)
  63 {
  64         const node_p node = NG_HOOK_NODE(hook);
  65         int error = 0;
  66         hook_p hook2;
  67         struct mbuf * const m = NGI_M(item), *m2;
  68         int nhooks;
  69
  70         if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
  71                 NG_FREE_ITEM(item);
  72                 return (0);
  73         }
  74         LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
  75                 if (hook2 == hook)
  76                         continue;
  77                 if (--nhooks == 1)
  78                         NG_FWD_ITEM_HOOK(error, item, hook2);
  79                 else {
  80                         if ((m2 = m_dup(m, MB_DONTWAIT)) == NULL) {
  81                                 NG_FREE_ITEM(item);
  82                                 return (ENOBUFS);
  83                         }
  84                         NG_SEND_DATA_ONLY(error, hook2, m2);
  85                         if (error)
  86                                 continue;       /* don't give up */
  87                 }
  88         }
  89
  90         return (error);
  91 }
  92
  93 static int
  94 ng_hub_disconnect(hook_p hook)
  95 {
  96
  97         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  98             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))
  99                 ng_rmnode_self(NG_HOOK_NODE(hook));
 100         return (0);
 101 }