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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Internet Protocol (IPv6) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_multicast_interface_leave PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This service removes the specific IPv6 multicast address from the */
/* sepcific physical interface. The link driver is also notified of */
/* the removal of the IPv6 multicast address. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* group_address IPv6 multicast address */
/* interface_index Index to physical interface */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* memset Clear the memory */
/* (ip_link_driver) Device driver entry point */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nxd_ipv6_multicast_interface_leave(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index)
{
#if defined(NX_ENABLE_IPV6_MULTICAST) && defined(FEATURE_NX_IPV6)
UINT i;
NX_IP_DRIVER driver_request;
NX_INTERFACE *nx_interface;
/* 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];
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Determine if the specified entry is present. */
if ((nx_interface == ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list) && (CHECK_IPV6_ADDRESSES_SAME(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list, group_address -> nxd_ip_address.v6)))
{
/* Yes, we have found the same entry. */
/* Decrease the join count. */
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_count--;
/* Determine if there are no other join requests for this group address. */
if (ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_count == 0)
{
/* Clear the group join value. */
memset(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list, 0, 4 * sizeof(ULONG));
/* Decrement the MLD groups joined count. */
ip_ptr -> nx_ipv6_multicast_groups_joined--;
/* 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 = 0x00003333;
driver_request.nx_ip_driver_physical_address_lsw = group_address -> nxd_ip_address.v6[3];
driver_request.nx_ip_driver_interface = nx_interface;
(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list -> nx_interface_link_driver_entry)(&driver_request);
/* Now clear the interface entry. */
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_interface_list = NX_NULL;
}
/* 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);
#else
NX_PARAMETER_NOT_USED(ip_ptr);
NX_PARAMETER_NOT_USED(group_address);
NX_PARAMETER_NOT_USED(interface_index);
return(NX_NOT_SUPPORTED);
#endif /* NX_ENABLE_IPV6_MULTICAST && FEATURE_NX_IPV6 */
}