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/9.0/sys/netgraph/ng_hub.c 220768 2011-04-18 09:12:27Z glebius $
   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 #ifdef NG_SEPARATE_MALLOC
   40 MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
   41 #else
   42 #define M_NETGRAPH_HUB M_NETGRAPH
   43 #endif
   44 
   45 /* Per-node private data */
   46 struct ng_hub_private {
   47         int             persistent;     /* can exist w/o hooks */
   48 };
   49 typedef struct ng_hub_private *priv_p;
   50 
   51 /* Netgraph node methods */
   52 static ng_constructor_t ng_hub_constructor;
   53 static ng_rcvmsg_t      ng_hub_rcvmsg;
   54 static ng_shutdown_t    ng_hub_shutdown;
   55 static ng_rcvdata_t     ng_hub_rcvdata;
   56 static ng_disconnect_t  ng_hub_disconnect;
   57 
   58 /* List of commands and how to convert arguments to/from ASCII */
   59 static const struct ng_cmdlist ng_hub_cmdlist[] = {
   60         {
   61                 NGM_HUB_COOKIE,
   62                 NGM_HUB_SET_PERSISTENT,
   63                 "setpersistent",
   64                 NULL,
   65                 NULL
   66         },
   67         { 0 }
   68 };
   69 
   70 static struct ng_type ng_hub_typestruct = {
   71         .version =      NG_ABI_VERSION,
   72         .name =         NG_HUB_NODE_TYPE,
   73         .constructor =  ng_hub_constructor,
   74         .rcvmsg =       ng_hub_rcvmsg,
   75         .shutdown =     ng_hub_shutdown,
   76         .rcvdata =      ng_hub_rcvdata,
   77         .disconnect =   ng_hub_disconnect,
   78         .cmdlist =      ng_hub_cmdlist,
   79 };
   80 NETGRAPH_INIT(hub, &ng_hub_typestruct);
   81 
   82 
   83 static int
   84 ng_hub_constructor(node_p node)
   85 {
   86         priv_p priv;
   87 
   88         /* Allocate and initialize private info */
   89         priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
   90 
   91         NG_NODE_SET_PRIVATE(node, priv);
   92         return (0);
   93 }
   94 
   95 /*
   96  * Receive a control message
   97  */
   98 static int
   99 ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
  100 {
  101         const priv_p priv = NG_NODE_PRIVATE(node);
  102         int error = 0;
  103         struct ng_mesg *msg;
  104 
  105         NGI_GET_MSG(item, msg);
  106         if (msg->header.typecookie == NGM_HUB_COOKIE &&
  107             msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
  108                 priv->persistent = 1;
  109         } else {
  110                 error = EINVAL;
  111         }
  112 
  113         NG_FREE_MSG(msg);
  114         return (error);
  115 }
  116 
  117 static int
  118 ng_hub_rcvdata(hook_p hook, item_p item)
  119 {
  120         const node_p node = NG_HOOK_NODE(hook);
  121         int error = 0;
  122         hook_p hook2;
  123         struct mbuf * const m = NGI_M(item), *m2;
  124         int nhooks;
  125 
  126         if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
  127                 NG_FREE_ITEM(item);
  128                 return (0);
  129         }
  130         LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
  131                 if (hook2 == hook)
  132                         continue;
  133                 if (--nhooks == 1)
  134                         NG_FWD_ITEM_HOOK(error, item, hook2);
  135                 else {
  136                         if ((m2 = m_dup(m, M_DONTWAIT)) == NULL) {
  137                                 NG_FREE_ITEM(item);
  138                                 return (ENOBUFS);
  139                         }
  140                         NG_SEND_DATA_ONLY(error, hook2, m2);
  141                         if (error)
  142                                 continue;       /* don't give up */
  143                 }
  144         }
  145 
  146         return (error);
  147 }
  148 
  149 /*
  150  * Shutdown node
  151  */
  152 static int
  153 ng_hub_shutdown(node_p node)
  154 {
  155         const priv_p priv = NG_NODE_PRIVATE(node);
  156 
  157         free(priv, M_NETGRAPH_HUB);
  158         NG_NODE_SET_PRIVATE(node, NULL);
  159         NG_NODE_UNREF(node);
  160         return (0);
  161 }
  162 
  163 static int
  164 ng_hub_disconnect(hook_p hook)
  165 {
  166         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  167 
  168         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  169             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
  170                 ng_rmnode_self(NG_HOOK_NODE(hook));
  171         return (0);
  172 }

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