90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/****************************************************************************
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* net/netdev/netdev_default.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 "utils/utils.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: netdev_default
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*
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* Description:
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* Return the default network device. REVISIT: At present this function
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* arbitrarily returns the first UP device at the head of the device
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* list. Perhaps the default device should be a device name
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* configuration option?
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*
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* So why is this here: It represents my current though for what to do
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* if a socket is connected with INADDY_ANY. In this case, I suppose we
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* should use the IP address associated with some default device???
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*
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* Input Parameters:
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* NULL
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*
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* Returned Value:
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* Pointer to default network driver on success; null on failure
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*
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****************************************************************************/
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FAR struct net_driver_s *netdev_default(void)
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{
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FAR struct net_driver_s *ret = NULL;
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FAR struct net_driver_s *dev;
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/* Examine each registered network device */
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net_lock();
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for (dev = g_netdevices; dev; dev = dev->flink)
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{
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/* Is the interface in the "up" state? */
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if ((dev->d_flags & IFF_UP) != 0)
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{
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/* Return a reference to the first device that we find in the UP
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* state (but not the loopback device unless it is the only
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* device).
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*/
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if (dev->d_lltype != NET_LL_LOOPBACK &&
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dev->d_lltype != NET_LL_CAN)
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{
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ret = dev;
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break;
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}
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}
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}
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net_unlock();
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return ret;
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}
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