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- /****************************************************************************
- * net/igmp/igmp_poll.c
- *
- * Copyright (C) 2010, 2018 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * The NuttX implementation of IGMP was inspired by the IGMP add-on for the
- * lwIP TCP/IP stack by Steve Reynolds:
- *
- * Copyright (c) 2002 CITEL Technologies Ltd.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <assert.h>
- #include <debug.h>
- #include <nuttx/semaphore.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/netstats.h>
- #include <nuttx/net/ip.h>
- #include "devif/devif.h"
- #include "igmp/igmp.h"
- #ifdef CONFIG_NET_IGMP
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: igmp_sched_send
- *
- * Description:
- * Construct and send the IGMP message.
- *
- * Returned Value:
- * Returns a non-zero value if an IGMP message is sent.
- *
- * Assumptions:
- * This function ust be called with the network locked.
- *
- ****************************************************************************/
- static inline void igmp_sched_send(FAR struct net_driver_s *dev,
- FAR struct igmp_group_s *group)
- {
- in_addr_t *dest;
- /* REVISIT: This should be deferred to a work queue */
- /* Check what kind of message we need to send. There are only two
- * possibilities:
- */
- if (group->msgid == IGMPv2_MEMBERSHIP_REPORT)
- {
- dest = &group->grpaddr;
- ninfo("Send IGMPv2_MEMBERSHIP_REPORT, dest=%08x flags=%02x\n",
- *dest, group->flags);
- SET_LASTREPORT(group->flags); /* Remember we were the last to report */
- }
- else
- {
- DEBUGASSERT(group->msgid == IGMP_LEAVE_GROUP);
- dest = &g_ipv4_allrouters;
- ninfo("Send IGMP_LEAVE_GROUP, dest=%08x flags=%02x\n",
- *dest, group->flags);
- }
- /* Send the message */
- igmp_send(dev, group, dest, group->msgid);
- /* Indicate that the message has been sent */
- CLR_SCHEDMSG(group->flags);
- group->msgid = 0;
- /* If there is a thread waiting fore the message to be sent, wake it up */
- if (IS_WAITMSG(group->flags))
- {
- ninfo("Awakening waiter\n");
- nxsem_post(&group->sem);
- }
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: igmp_poll
- *
- * Description:
- * Poll the groups associated with the device to see if any IGMP messages
- * are pending transfer.
- *
- * Returned Value:
- * Returns a non-zero value if a IGP message is sent.
- *
- * Assumptions:
- * This function must be called with the network locked.
- *
- ****************************************************************************/
- void igmp_poll(FAR struct net_driver_s *dev)
- {
- FAR struct igmp_group_s *group;
- /* Setup the poll operation */
- dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev) + IPIGMP_HDRLEN];
- dev->d_len = 0;
- dev->d_sndlen = 0;
- /* Check each member of the group */
- for (group = (FAR struct igmp_group_s *)dev->d_igmp_grplist.head;
- group;
- group = group->next)
- {
- /* Does this member have a pending outgoing message? */
- if (IS_SCHEDMSG(group->flags))
- {
- /* Yes, create the IGMP message in the driver buffer */
- igmp_sched_send(dev, group);
- break;
- }
- }
- }
- #endif /* CONFIG_NET_IGMP */
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