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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Ruslan Ermilov
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/netgraph/ng_hub.c 326272 2017-11-27 15:23:17Z pfg $
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/errno.h>
   33 #include <sys/kernel.h>
   34 #include <sys/mbuf.h>
   35 #include <sys/systm.h>
   36 
   37 #include <netgraph/ng_message.h>
   38 #include <netgraph/ng_hub.h>
   39 #include <netgraph/netgraph.h>
   40 
   41 #ifdef NG_SEPARATE_MALLOC
   42 static MALLOC_DEFINE(M_NETGRAPH_HUB, "netgraph_hub", "netgraph hub node");
   43 #else
   44 #define M_NETGRAPH_HUB M_NETGRAPH
   45 #endif
   46 
   47 /* Per-node private data */
   48 struct ng_hub_private {
   49         int             persistent;     /* can exist w/o hooks */
   50 };
   51 typedef struct ng_hub_private *priv_p;
   52 
   53 /* Netgraph node methods */
   54 static ng_constructor_t ng_hub_constructor;
   55 static ng_rcvmsg_t      ng_hub_rcvmsg;
   56 static ng_shutdown_t    ng_hub_shutdown;
   57 static ng_rcvdata_t     ng_hub_rcvdata;
   58 static ng_disconnect_t  ng_hub_disconnect;
   59 
   60 /* List of commands and how to convert arguments to/from ASCII */
   61 static const struct ng_cmdlist ng_hub_cmdlist[] = {
   62         {
   63                 NGM_HUB_COOKIE,
   64                 NGM_HUB_SET_PERSISTENT,
   65                 "setpersistent",
   66                 NULL,
   67                 NULL
   68         },
   69         { 0 }
   70 };
   71 
   72 static struct ng_type ng_hub_typestruct = {
   73         .version =      NG_ABI_VERSION,
   74         .name =         NG_HUB_NODE_TYPE,
   75         .constructor =  ng_hub_constructor,
   76         .rcvmsg =       ng_hub_rcvmsg,
   77         .shutdown =     ng_hub_shutdown,
   78         .rcvdata =      ng_hub_rcvdata,
   79         .disconnect =   ng_hub_disconnect,
   80         .cmdlist =      ng_hub_cmdlist,
   81 };
   82 NETGRAPH_INIT(hub, &ng_hub_typestruct);
   83 
   84 
   85 static int
   86 ng_hub_constructor(node_p node)
   87 {
   88         priv_p priv;
   89 
   90         /* Allocate and initialize private info */
   91         priv = malloc(sizeof(*priv), M_NETGRAPH_HUB, M_WAITOK | M_ZERO);
   92 
   93         NG_NODE_SET_PRIVATE(node, priv);
   94         return (0);
   95 }
   96 
   97 /*
   98  * Receive a control message
   99  */
  100 static int
  101 ng_hub_rcvmsg(node_p node, item_p item, hook_p lasthook)
  102 {
  103         const priv_p priv = NG_NODE_PRIVATE(node);
  104         int error = 0;
  105         struct ng_mesg *msg;
  106 
  107         NGI_GET_MSG(item, msg);
  108         if (msg->header.typecookie == NGM_HUB_COOKIE &&
  109             msg->header.cmd == NGM_HUB_SET_PERSISTENT) {
  110                 priv->persistent = 1;
  111         } else {
  112                 error = EINVAL;
  113         }
  114 
  115         NG_FREE_MSG(msg);
  116         return (error);
  117 }
  118 
  119 static int
  120 ng_hub_rcvdata(hook_p hook, item_p item)
  121 {
  122         const node_p node = NG_HOOK_NODE(hook);
  123         int error = 0;
  124         hook_p hook2;
  125         struct mbuf * const m = NGI_M(item), *m2;
  126         int nhooks;
  127 
  128         if ((nhooks = NG_NODE_NUMHOOKS(node)) == 1) {
  129                 NG_FREE_ITEM(item);
  130                 return (0);
  131         }
  132         LIST_FOREACH(hook2, &node->nd_hooks, hk_hooks) {
  133                 if (hook2 == hook)
  134                         continue;
  135                 if (--nhooks == 1)
  136                         NG_FWD_ITEM_HOOK(error, item, hook2);
  137                 else {
  138                         if ((m2 = m_dup(m, M_NOWAIT)) == NULL) {
  139                                 NG_FREE_ITEM(item);
  140                                 return (ENOBUFS);
  141                         }
  142                         NG_SEND_DATA_ONLY(error, hook2, m2);
  143                         if (error)
  144                                 continue;       /* don't give up */
  145                 }
  146         }
  147 
  148         return (error);
  149 }
  150 
  151 /*
  152  * Shutdown node
  153  */
  154 static int
  155 ng_hub_shutdown(node_p node)
  156 {
  157         const priv_p priv = NG_NODE_PRIVATE(node);
  158 
  159         free(priv, M_NETGRAPH_HUB);
  160         NG_NODE_SET_PRIVATE(node, NULL);
  161         NG_NODE_UNREF(node);
  162         return (0);
  163 }
  164 
  165 static int
  166 ng_hub_disconnect(hook_p hook)
  167 {
  168         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  169 
  170         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
  171             NG_NODE_IS_VALID(NG_HOOK_NODE(hook)) && !priv->persistent)
  172                 ng_rmnode_self(NG_HOOK_NODE(hook));
  173         return (0);
  174 }

Cache object: b2d0ce006cf6672830bc0e0904e616c6


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