86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/****************************************************************************
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* net/utils/net_bounddev.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/net.h>
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#include "netdev/netdev.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_bound_device
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*
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* Description:
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* If the socket is bound to a device, return the reference to the
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* bound device.
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*
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* Input Parameters:
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* sconn - Socket connection structure (not currently used).
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*
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* Returned Value:
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* A reference to the bound device. If the retained interface index no
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* longer refers to a valid device, this function will unbind the device
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* and return an arbitrary network device at the head of the list of
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* registered devices. This supports legacy IPv4 DHCPD behavior when
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* there is only a single registered network device.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_BINDTODEVICE
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FAR struct net_driver_s *net_bound_device(FAR struct socket_conn_s *sconn)
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{
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FAR struct net_driver_s *dev = NULL;
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/* Is the socket bound to a device? */
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if (sconn->s_boundto != 0)
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{
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/* Yes..This socket has been bound to an interface. Convert the
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* interface index into a device structure reference.
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*/
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dev = netdev_findbyindex(sconn->s_boundto);
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if (dev == NULL)
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{
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/* No device? It must have been unregistered. Un-bind the
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* socket.
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*/
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sconn->s_boundto = 0;
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}
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}
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/* If no device was bound or the bound device is no longer valid,
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* then let's try the default network device.
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*/
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return dev == NULL ? netdev_default() : dev;
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}
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#endif
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