d78bf36740
In the current net stack implementation, there is no mechanism for notifying the loss of the wireless connection, if the network is disconnected then application sends data packets through tcp, the tcp_timer will keep retrying fetch the ack for awhile, the connection status will not be able to be switched timely. Change-Id: I84d1121527edafc6ee6ad56ba164838694e7e11c Signed-off-by: chao.an <anchao@xiaomi.com>
118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/****************************************************************************
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* net/netdev/netdev_carrier.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Max Holtzberg <mh@uvc.de>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sys/socket.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <net/if.h>
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#include <net/ethernet.h>
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#include <nuttx/net/netdev.h>
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#include "netdev/netdev.h"
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#include "netlink/netlink.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_carrier_on
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*
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* Description:
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* Notifies the networking layer about an available carrier.
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* (e.g. a cable was plugged in)
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*
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* Input Parameters:
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* dev - The device driver structure
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*
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* Returned Value:
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* 0:Success; negated errno on failure
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*
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****************************************************************************/
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int netdev_carrier_on(FAR struct net_driver_s *dev)
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{
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if (dev)
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{
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dev->d_flags |= IFF_RUNNING;
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netlink_device_notify(dev);
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return OK;
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}
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return -EINVAL;
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}
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/****************************************************************************
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* Name: netdev_carrier_off
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*
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* Description:
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* Notifies the networking layer about an disappeared carrier.
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* (e.g. a cable was unplugged)
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*
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* Input Parameters:
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* dev - The device driver structure
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*
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* Returned Value:
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* 0:Success; negated errno on failure
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*
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****************************************************************************/
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int netdev_carrier_off(FAR struct net_driver_s *dev)
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{
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if (dev)
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{
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dev->d_flags &= ~IFF_RUNNING;
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netlink_device_notify(dev);
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/* Notify clients that the network has been taken down */
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devif_dev_event(dev, NULL, NETDEV_DOWN);
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return OK;
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}
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return -EINVAL;
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}
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