153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/****************************************************************************
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* net/mld/mld_poll.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
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* may be 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 CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* 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 <assert.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/ip.h>
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#include "devif/devif.h"
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#include "mld/mld.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_poll
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*
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* Description:
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* Poll the groups associated with the device to see if any MLD messages
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* are pending transfer.
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*
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* Returned Value:
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* Returns a non-zero value if a IGP message is sent.
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*
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* Assumptions:
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* This function must be called with the network locked.
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*
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****************************************************************************/
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void mld_poll(FAR struct net_driver_s *dev)
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{
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FAR struct mld_group_s *group;
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/* Setup the poll operation */
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dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN];
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dev->d_len = 0;
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dev->d_sndlen = 0;
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/* Check if a general query is pending */
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if (IS_MLD_GENPEND(dev->d_mld.flags))
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{
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/* Clear the pending flag */
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CLR_MLD_GENPEND(dev->d_mld.flags);
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/* Are we still the querier? */
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if (IS_MLD_QUERIER(dev->d_mld.flags))
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{
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/* Yes, send the general query and return */
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mld_send(dev, NULL, MLD_SEND_GENQUERY);
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return;
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}
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}
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/* Check each member of the group */
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for (group = (FAR struct mld_group_s *)dev->d_mld.grplist.head;
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group;
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group = group->next)
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{
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/* Does this member have a pending outgoing message? */
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if (IS_MLD_SCHEDMSG(group->flags))
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{
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/* Yes.. create the MLD message in the driver buffer */
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mld_send(dev, group, group->msgtype);
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/* Indicate that the message has been sent */
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CLR_MLD_SCHEDMSG(group->flags);
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group->msgtype = MLD_SEND_NONE;
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/* If there is a thread waiting fore the message to be sent, wake
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* it up.
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*/
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if (IS_MLD_WAITMSG(group->flags))
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{
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mldinfo("Awakening waiter\n");
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CLR_MLD_WAITMSG(group->flags);
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nxsem_post(&group->sem);
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}
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/* And break out of the loop */
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break;
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}
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/* No.. does this message have a pending report still to be sent? */
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else if (IS_MLD_RPTPEND(group->flags))
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{
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/* Yes.. create the MLD message in the driver buffer */
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mld_send(dev, group, mld_report_msgtype(dev));
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/* Indicate that the report is no longer pending */
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CLR_MLD_RPTPEND(group->flags);
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/* And break out of the loop */
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break;
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}
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}
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}
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