1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 13 /**************************************************************************/ 14 /**************************************************************************/ 15 /** */ 16 /** NetX Component */ 17 /** */ 18 /** Internet Group Management Protocol (IGMP) */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define NX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "nx_api.h" 29 #include "nx_igmp.h" 30 31 #ifndef NX_DISABLE_IPV4 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _nx_igmp_periodic_processing PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Yuxin Zhou, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function handles the sending of periodic processing of IGMP */ 45 /* join report messages. */ 46 /* */ 47 /* INPUT */ 48 /* */ 49 /* ip_ptr IP instance pointer */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* None */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* nx_igmp_interface_report_send Send IGMP group report */ 58 /* */ 59 /* CALLED BY */ 60 /* */ 61 /* _nx_ip_thread_entry IP helper thread */ 62 /* */ 63 /* RELEASE HISTORY */ 64 /* */ 65 /* DATE NAME DESCRIPTION */ 66 /* */ 67 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */ 68 /* 09-30-2020 Yuxin Zhou Modified comment(s), */ 69 /* resulting in version 6.1 */ 70 /* */ 71 /**************************************************************************/ _nx_igmp_periodic_processing(NX_IP * ip_ptr)72VOID _nx_igmp_periodic_processing(NX_IP *ip_ptr) 73 { 74 75 UINT i; 76 UINT status; 77 UINT sent_count = 0; 78 NX_INTERFACE *interface_ptr; 79 UINT interface_index; 80 81 82 /* Search the multicast join list for pending IGMP responses. */ 83 for (i = 0; i < NX_MAX_MULTICAST_GROUPS; i++) 84 { 85 86 /* Determine if the specified entry is active. */ 87 if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list) 88 { 89 90 /* Now determine if a response is pending. */ 91 if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time > 0) && 92 (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time != NX_WAIT_FOREVER)) 93 { 94 95 /* Yes, it is active. Decrement and check for expiration. */ 96 ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time--; 97 98 /* We don't want to decrement a join group if we cannot send it. Check 99 if we've already sent a packet on this periodic. */ 100 if ((ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time == 0) && (sent_count > 0)) 101 { 102 103 /* Restore the timeout to 1 second because we cannot send on this periodic; we've already sent out a packet. */ 104 ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time = 1; 105 } 106 107 /* Has time expired and have we not sent an IGMP report in this period? */ 108 if (ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_update_time == 0) 109 { 110 111 /* Yes, time has expired and we have not yet sent a packet out on this periodic. */ 112 113 /* Build and send the join report packet. */ 114 interface_ptr = ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_interface_list; 115 116 interface_index = (UINT)interface_ptr -> nx_interface_index; 117 118 /* Build a IGMP host response packet for a join report and send it! */ 119 status = _nx_igmp_interface_report_send(ip_ptr, ip_ptr -> nx_ipv4_multicast_entry[i].nx_ipv4_multicast_join_list, 120 interface_index, NX_TRUE); 121 122 if (status == NX_SUCCESS) 123 { 124 125 /* Update the sent count. Only one report sent per IP periodic. */ 126 sent_count++; 127 } 128 } 129 } 130 } 131 } 132 } 133 #endif /* !NX_DISABLE_IPV4 */ 134 135
