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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 Protocol (IPv6) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ipv6.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_ipv6_multicast_interface_join PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This service allows an application to join a specific IPv6 */
/* multicast address on a specific physical interface. The link */
/* driver is notified to add the multicast address. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* group_address IPv6 multicast address */
/* interface_index Index to the phyical 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 */
/* CHECK_IPV6_ADDRESSES_SAME IPv6 address compare */
/* CHECK_UNSPECIFIED_ADDRESS Check for :: address */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _nxd_ipv6_multicast_interface_join(NX_IP *ip_ptr, NXD_ADDRESS *group_address, UINT interface_index)
{
#if defined(NX_ENABLE_IPV6_MULTICAST) && defined(FEATURE_NX_IPV6)
UINT i;
UINT first_free;
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];
/* Search the multicast join list for either the same group request. */
first_free = NX_MAX_MULTICAST_GROUPS;
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Determine if the specified entry is already in the multicast join list. */
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. The only thing required in this
case is to increment the join count and return. */
ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_count++;
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return number of the group. */
return(NX_SUCCESS);
}
/* Check for an empty entry. */
if (CHECK_UNSPECIFIED_ADDRESS(ip_ptr -> nx_ipv6_multicast_entry[i].nx_ip_mld_join_list) && (first_free == NX_MAX_MULTICAST_GROUPS))
{
/* Remember the first free entry. */
first_free = i;
}
}
/* At this point, we have a new entry. First, check to see if there is an available
entry. */
if (first_free == NX_MAX_MULTICAST_GROUPS)
{
/* Release the protection of the IP instance. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return an error code to indicate there are no more group addresses
available. */
return(NX_NO_MORE_ENTRIES);
}
/* Set it up in the IP control structures. */
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_list[0] = group_address -> nxd_ip_address.v6[0];
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_list[1] = group_address -> nxd_ip_address.v6[1];
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_list[2] = group_address -> nxd_ip_address.v6[2];
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_list[3] = group_address -> nxd_ip_address.v6[3];
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_interface_list = nx_interface;
ip_ptr -> nx_ipv6_multicast_entry[first_free].nx_ip_mld_join_count = 1;
/* Increment the MLD groups joined count. */
ip_ptr -> nx_ipv6_multicast_groups_joined++;
/* Register the new multicast group with the underlying driver to
ensure that there is room for the new group at the hardware level. */
driver_request.nx_ip_driver_ptr = ip_ptr;
driver_request.nx_ip_driver_command = NX_LINK_MULTICAST_JOIN;
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;
(nx_interface -> nx_interface_link_driver_entry)(&driver_request);
/* Check the return driver status. */
/*lint -e{644} suppress variable might not be initialized, since "nx_ip_driver_status" was initialized in nx_interface_link_driver_entry. */
if (driver_request.nx_ip_driver_status != NX_SUCCESS)
{
/* Release the protection of the IP instance. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return an error code to indicate there are no more group addresses
available. */
return(NX_OVERFLOW);
}
/* Release the protection over the IP instance. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return SUCCESS. */
return(NX_SUCCESS);
#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 */
}
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