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/****************************************************************************
* net/igmp/igmp_poll.c
*
* Copyright (C) 2010 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/net/netconfig.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/netdev.h>
#include "uip/uip_internal.h"
#ifdef CONFIG_NET_IGMP
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: uip_schedsend
*
* Description:
* Construct the .
*
* Returned Value:
* Returns a non-zero value if an IGMP message is sent.
*
* Assumptions:
* This function is called from the driver polling logic... probably within
* an interrupt handler.
*
****************************************************************************/
static inline void uip_schedsend(FAR struct uip_driver_s *dev, FAR struct igmp_group_s *group)
{
uip_ipaddr_t *dest;
/* Check what kind of message we need to send. There are only two
* possibilities:
*/
if (group->msgid == IGMPv2_MEMBERSHIP_REPORT)
{
dest = &group->grpaddr;
nllvdbg("Send IGMPv2_MEMBERSHIP_REPORT, dest=%08x flags=%02x\n",
*dest, group->flags);
IGMP_STATINCR(uip_stat.igmp.report_sched);
SET_LASTREPORT(group->flags); /* Remember we were the last to report */
}
else
{
DEBUGASSERT(group->msgid == IGMP_LEAVE_GROUP);
dest = &g_allrouters;
nllvdbg("Send IGMP_LEAVE_GROUP, dest=%08x flags=%02x\n",
*dest, group->flags);
IGMP_STATINCR(uip_stat.igmp.leave_sched);
}
/* Send the message */
uip_igmpsend(dev, group, dest);
/* 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))
{
nllvdbg("Awakening waiter\n");
sem_post(&group->sem);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: uip_igmppoll
*
* 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 is called from the driver polling logic... probably within
* an interrupt handler.
*
****************************************************************************/
void uip_igmppoll(FAR struct uip_driver_s *dev)
{
FAR struct igmp_group_s *group;
nllvdbg("Entry\n");
/* Setup the poll operation */
dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPIGMPH_LEN];
dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPIGMPH_LEN];
dev->d_len = 0;
dev->d_sndlen = 0;
/* Check each member of the group */
for (group = (FAR struct igmp_group_s *)dev->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 */
uip_schedsend(dev, group);
/* Mark the message as sent and break out */
CLR_SCHEDMSG(group->flags);
break;
}
}
}
#endif /* CONFIG_NET_IGMP */
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