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 /** Transmission Control Protocol (TCP) */
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_tcp.h"
30
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _nx_tcp_packet_send_probe PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* Yuxin Zhou, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function sends a zero window probe from the specified socket. */
45 /* */
46 /* INPUT */
47 /* */
48 /* socket_ptr Pointer to socket */
49 /* tx_sequence Transmit sequence number */
50 /* data One byte to transmit */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* None */
55 /* */
56 /* CALLS */
57 /* */
58 /* _nx_tcp_packet_send_control Send TCP control packet */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* _nx_tcp_fast_periodic_processing Delayed ACK processing */
63 /* processing */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
70 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
71 /* resulting in version 6.1 */
72 /* */
73 /**************************************************************************/
_nx_tcp_packet_send_probe(NX_TCP_SOCKET * socket_ptr,ULONG tx_sequence,UCHAR data)74 VOID _nx_tcp_packet_send_probe(NX_TCP_SOCKET *socket_ptr, ULONG tx_sequence, UCHAR data)
75 {
76
77 _nx_tcp_packet_send_control(socket_ptr, NX_TCP_ACK_BIT, tx_sequence,
78 socket_ptr -> nx_tcp_socket_rx_sequence, 0, 0, &data);
79
80 /* Setup a new delayed ACK timeout. */
81 socket_ptr -> nx_tcp_socket_delayed_ack_timeout = _nx_tcp_ack_timer_rate;
82 }
83
84
