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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_check PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks the list of joined multicast addresses to see */
/* if the incoming address matches. If the specified group is */
/* "all hosts" or if a match is found, NX_TRUE is returned to the */
/* caller. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* group Multicast group IP address */
/* nx_interface Pointer to interface */
/* */
/* OUTPUT */
/* */
/* NX_TRUE If a match is found */
/* NX_FALSE Otherwise */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_ipv4_packet_receive Raw IP packet receive */
/* */
/* 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_check(NX_IP *ip_ptr, ULONG group, NX_INTERFACE *nx_interface)
{
UINT i;
/* Check for "all hosts" group. We always assume all hosts membership. */
/*lint -e{835} -e{845} suppress operating on zero. */
if (group == NX_ALL_HOSTS_ADDRESS)
{
return(NX_TRUE);
}
/* Loop through the IP multicast join list to find the matching group that is being
responded to by another host on this same network. */
for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++)
{
/* Check for a match. */
if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list == group) &&
(nx_interface == ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list))
{
return(NX_TRUE);
}
}
/* Otherwise, we have searched the entire list, return false. */
return(NX_FALSE);
}
#endif /* !NX_DISABLE_IPV4 */