/*************************************************************************** * Copyright (c) 2024 Microsoft Corporation * * 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_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 */