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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/**************************************************************************/
/* */
/* 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_packet.h"
#include "nx_igmp.h"
#include "nx_ip.h"
#include "tx_thread.h"
#ifndef NX_DISABLE_IPV4
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_igmp_packet_receive PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles reception of IGMP packets on the "all hosts" */
/* multicast address. If this routine is called from an ISR, the */
/* IGMP packet is queued. Otherwise, if this routine is called from */
/* the IP helper thread, the processing of the IGMP packet is called */
/* directly. */
/* */
/* INPUT */
/* */
/* ip_ptr IP instance pointer */
/* packet_ptr IGMP packet pointer */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nx_igmp_packet_process Process the IGMP packet */
/* tx_event_flags_set Set event flags for IP helper */
/* thread */
/* */
/* CALLED BY */
/* */
/* _nx_ip_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 */
/* */
/**************************************************************************/
VOID _nx_igmp_packet_receive(NX_IP *ip_ptr, NX_PACKET *packet_ptr)
{
TX_INTERRUPT_SAVE_AREA
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
#ifndef NX_DISABLE_RX_SIZE_CHECKING
/* Check for valid packet length. */
if (packet_ptr -> nx_packet_length < sizeof(NX_IGMP_HEADER))
{
#ifndef NX_DISABLE_IGMP_INFO
/* Increment the IGMP invalid packet error. */
ip_ptr -> nx_ip_igmp_invalid_packets++;
#endif
/* Invalid packet length, just release it. */
_nx_packet_release(packet_ptr);
/* The function is complete, just return! */
return;
}
#endif
/* Determine if this routine is being called from an ISR. */
if ((TX_THREAD_GET_SYSTEM_STATE()) || (&(ip_ptr -> nx_ip_thread) != _tx_thread_current_ptr))
{
/* If system state is non-zero, we are in an ISR. If the current thread is not the IP thread,
we need to prevent unnecessary recursion in loopback. Just place the message at the
end of the IGMP message queue and wakeup the IP helper thread. */
/* Disable interrupts. */
TX_DISABLE
/* Add the packet to the IGMP message queue. */
if (ip_ptr -> nx_ip_igmp_queue_head)
{
/* Link the current packet to the list head. */
packet_ptr -> nx_packet_queue_next = ip_ptr -> nx_ip_igmp_queue_head;
}
else
{
/* Empty queue, add to the head of the IGMP message queue. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
}
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Update the queue head pointer. */
ip_ptr -> nx_ip_igmp_queue_head = packet_ptr;
/* Restore interrupts. */
TX_RESTORE
/* Wakeup IP thread for processing one or more messages in the IGMP queue. */
tx_event_flags_set(&(ip_ptr -> nx_ip_events), NX_IP_IGMP_EVENT, TX_OR);
}
else
{
/* The IP message was deferred, so this routine is called from the IP helper
thread and thus may call the IGMP processing directly. */
_nx_igmp_packet_process(ip_ptr, packet_ptr);
}
}
#endif /* !NX_DISABLE_IPV4 */