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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Internet Group Management Protocol (IGMP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_igmp.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_igmp_periodic_processing PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles the sending of periodic processing of IGMP */
/* join report messages. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* nx_igmp_interface_report_send Send IGMP group report */
/* */
/* CALLED BY */
/* */
/* _nx_ip_thread_entry IP helper thread */
/* */
/**************************************************************************/
VOID _nx_igmp_periodic_processing(NX_IP *ip_ptr)
{
UINT i;
UINT status;
UINT sent_count = 0;
NX_INTERFACE *interface_ptr;
UINT interface_index;
/* Search the multicast join list for pending IGMP responses. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Determine if the specified entry is active. */
if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list)
{
/* Now determine if a response is pending. */
if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time > 0) &&
(ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time != NX_WAIT_FOREVER))
{
/* Yes, it is active. Decrement and check for expiration. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time--;
/* We don't want to decrement a join group if we cannot send it. Check
if we've already sent a packet on this periodic. */
if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time == 0) && (sent_count > 0))
{
/* Restore the timeout to 1 second because we cannot send on this periodic; we've already sent out a packet. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time = 1;
}
/* Has time expired and have we not sent an IGMP report in this period? */
if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time == 0)
{
/* Yes, time has expired and we have not yet sent a packet out on this periodic. */
/* Build and send the join report packet. */
interface_ptr = ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list;
interface_index = (UINT)interface_ptr -> nx_interface_index;
/* Build a IGMP host response packet for a join report and send it! */
status = _nx_igmp_interface_report_send(ip_ptr, ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list,
interface_index, NX_TRUE);
if (status == NX_SUCCESS)
{
/* Update the sent count. Only one report sent per IP periodic. */
sent_count++;
}
}
}
}
}
}
#endif /* !NX_DISABLE_IPV4 */
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