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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 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_join_internal PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles the request to join the specified multicast */
/* group on a specified network device. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* group_address Multicast group to join */
/* interface_index Index to the interface */
/* update_time Update time */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* (ip_link_driver) Associated IP link driver */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 _nx_igmp_multicast_interface_join_internal(NX_IP *ip_ptr, ULONG group_address,
UINT interface_index, UINT update_time)
{
UINT i;
UINT first_free;
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_JOIN, ip_ptr, group_address, interface_index, 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 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 ((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. The only thing required in this
case is to increment the join count and return. */
ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_count++;
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return success! */
return(NX_SUCCESS);
}
/* Check for an empty entry. */
if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list == 0) &&
(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);
}
/* 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 = 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 = nx_interface;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_IO_DRIVER_MULTICAST_JOIN, ip_ptr, 0, 0, 0, NX_TRACE_INTERNAL_EVENTS, 0, 0);
(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_NO_MORE_ENTRIES);
}
/* Set it up in the IP control structures. */
ip_ptr -> nx_ipv4_multicast_entry[first_free].nx_ipv4_multicast_join_list = group_address;
ip_ptr -> nx_ipv4_multicast_entry[first_free].nx_ipv4_multicast_join_interface_list = nx_interface;
ip_ptr -> nx_ipv4_multicast_entry[first_free].nx_ipv4_multicast_join_count = 1;
ip_ptr -> nx_ipv4_multicast_entry[first_free].nx_ipv4_multicast_update_time = update_time; /* Update on next IGMP periodic */
ip_ptr -> nx_ipv4_multicast_entry[first_free].nx_ipv4_multicast_loopback_enable = ip_ptr -> nx_ip_igmp_global_loopback_enable;
#ifndef NX_DISABLE_IGMP_INFO
/* Increment the IGMP groups joined count. */
ip_ptr -> nx_ip_igmp_groups_joined++;
#endif
/* Release the protection over the IP instance. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return a successful status! */
return(NX_SUCCESS);
}
#endif /* !NX_DISABLE_IPV4 */
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