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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_multicast_interface_leave_internal PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles the request to leave the specified multicast */
/* group. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* group_address Multicast group to join */
/* interface_index Interface index */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion status */
/* NX_ENTRY_NOT_FOUND Group address not found in the*/
/* IGMP join list */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* (ip_link_driver) Associated IP link driver */
/* nx_igmp_interface_report_send Send IGMP group reports */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_igmp_multicast_interface_leave_internal(NX_IP *ip_ptr, ULONG group_address, UINT interface_index)
{
UINT i;
NX_IP_DRIVER driver_request;
NX_INTERFACE *nx_interface;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_IGMP_MULTICAST_LEAVE, ip_ptr, group_address, 0, 0, NX_TRACE_IGMP_EVENTS, 0, 0);
/* Obtain the IP mutex so we can search the multicast join list. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
nx_interface = &ip_ptr -> nx_ip_interface[interface_index];
/* Search the multicast join list for the group request. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Determine if the specified entry is present. */
if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list == group_address) &&
(ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list == nx_interface))
{
/* Yes, we have found the same entry. */
/* Decrease the join count. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_count--;
/* Determine if there are no other join requests for this group address. */
if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_count == 0)
{
/* Clear the group join value. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list = 0;
/* Un-register the new multicast group with the underlying driver. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_MULTICAST_LEAVE;
driver_request.nx_ip_driver_physical_address_msw = NX_IP_MULTICAST_UPPER;
driver_request.nx_ip_driver_physical_address_lsw = NX_IP_MULTICAST_LOWER | (group_address & NX_IP_MULTICAST_MASK);
driver_request.nx_ip_driver_interface = ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_MULTICAST_LEAVE, ip_ptr, 0, 0, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
(ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list -> nx_interface_link_driver_entry)(&driver_request);
/* Clear the interface entry for version IGMPv1. Don't need it anymore. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list = NX_NULL;
#ifndef NX_DISABLE_IGMP_INFO
/* Decrement the IGMP groups joined count. */
ip_ptr -> nx_ip_igmp_groups_joined--;
#endif
#ifndef NX_DISABLE_IGMPV2
/* Check if the entry is a local multicast join. */
if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time == NX_WAIT_FOREVER)
{
/* It is. Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success. */
return(NX_SUCCESS);
}
/* IGMPv1 hosts do not send a leave group message. */
if (ip_ptr -> nx_ip_igmp_router_version == NX_IGMP_HOST_VERSION_1)
{
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success! */
return(NX_SUCCESS);
}
/* Build and send the leave report packet. */
_nx_igmp_interface_report_send(ip_ptr, group_address, interface_index, NX_FALSE);
#endif /* NX_DISABLE_IGMPV2 */
}
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success. */
return(NX_SUCCESS);
}
}
/* At this point we know that the supplied entry was not found. */
/* Release the protection of the IP instance. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return an error code. */
return(NX_ENTRY_NOT_FOUND);
}
#endif /* !NX_DISABLE_IPV4 */
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