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