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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2004 Ruslan Ermilov
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/errno.h>
    #include <sys/kernel.h>
    #include <sys/mbuf.h>
    #include <sys/systm.h>
    
    #include <netgraph/ng_message.h>
    #include <netgraph/ng_hub.h>
    #include <netgraph/netgraph.h>
    
    #ifdef NG_SEPARATE_MALLOC
    static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
    #else
    #define M_NETGRAPH_HUB M_NETGRAPH
    #endif
    
    /* Per-node private data */
    struct ng_hub_private {
            int             persistent;     /* can exist w/o hooks */
    };
    typedef struct ng_hub_private *priv_p;
    
    /* Netgraph node methods */
    static ng_constructor_t ng_hub_constructor;
    static ng_rcvmsg_t      ng_hub_rcvmsg;
    static ng_shutdown_t    ng_hub_shutdown;
    static ng_rcvdata_t     ng_hub_rcvdata;
    static ng_disconnect_t  ng_hub_disconnect;
    
    /* List of commands and how to convert arguments to/from ASCII */
    static const struct ng_cmdlist ng_hub_cmdlist[] = {
            {
                    NGM_HUB_COOKIE,
                    NGM_HUB_SET_PERSISTENT,
                    "setpersistent",
                    NULL,
                    NULL
            },
            { 0 }
    };
    
    static struct ng_type ng_hub_typestruct = {
            .version =      NG_ABI_VERSION,
            .name =         NG_HUB_NODE_TYPE,
            .constructor =  ng_hub_constructor,
            .rcvmsg =       ng_hub_rcvmsg,
            .shutdown =     ng_hub_shutdown,
            .rcvdata =      ng_hub_rcvdata,
            .disconnect =   ng_hub_disconnect,
            .cmdlist =      ng_hub_cmdlist,
    };
    NETGRAPH_INIT(hub, &ng_hub_typestruct);
    
    static int
    ng_hub_constructor(node_p node)
    {
            priv_p priv;
    
            /* Allocate and initialize private info */
            priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
    
            NG_NODE_SET_PRIVATE(node, priv);
            return (0);
    }
    
    /*
     * Receive a control message
     */
    static int
   ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
   {
           const priv_p priv = NG_NODE_PRIVATE(node);
           int error = 0;
           struct ng_mesg *msg;
   
           NGI_GET_MSG(item, msg);
           if (msg->header.typecookie == NGM_HUB_COOKIE &&
               msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
                   priv->persistent = 1;
           } else {
                   error = EINVAL;
           }
   
           NG_FREE_MSG(msg);
           return (error);
   }
   
   static int
   ng_hub_rcvdata(hook_p hook, item_p item)
   {
           const node_p node = NG_HOOK_NODE(hook);
           int error = 0;
           hook_p hook2;
           struct mbuf * const m = NGI_M(item), *m2;
           int nhooks;
   
           if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
                   NG_FREE_ITEM(item);
                   return (0);
           }
           LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
                   if (hook2 == hook)
                           continue;
                   if (--nhooks == 1)
                           NG_FWD_ITEM_HOOK(error, item, hook2);
                   else {
                           if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
                                   NG_FREE_ITEM(item);
                                   return (ENOBUFS);
                           }
                           NG_SEND_DATA_ONLY(error, hook2, m2);
                           if (error)
                                   continue;       /* don't give up */
                   }
           }
   
           return (error);
   }
   
   /*
    * Shutdown node
    */
   static int
   ng_hub_shutdown(node_p node)
   {
           const priv_p priv = NG_NODE_PRIVATE(node);
   
           free(priv, M_NETGRAPH_HUB);
           NG_NODE_SET_PRIVATE(node, NULL);
           NG_NODE_UNREF(node);
           return (0);
   }
   
   static int
   ng_hub_disconnect(hook_p hook)
   {
           const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
   
           if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
               NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
                   ng_rmnode_self(NG_HOOK_NODE(hook));
           return (0);
   }

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