1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** NetX Component */
16 /** */
17 /** Transmission Control Protocol (TCP) */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22 #define NX_SOURCE_CODE
23
24
25 /* Include necessary system files. */
26
27 #include "nx_api.h"
28 #include "nx_tcp.h"
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* _nx_tcp_packet_send_probe PORTABLE C */
36 /* 6.1 */
37 /* AUTHOR */
38 /* */
39 /* Yuxin Zhou, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* This function sends a zero window probe from the specified socket. */
44 /* */
45 /* INPUT */
46 /* */
47 /* socket_ptr Pointer to socket */
48 /* tx_sequence Transmit sequence number */
49 /* data One byte to transmit */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* None */
54 /* */
55 /* CALLS */
56 /* */
57 /* _nx_tcp_packet_send_control Send TCP control packet */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* _nx_tcp_fast_periodic_processing Delayed ACK processing */
62 /* processing */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
69 /* 09-30-2020 Yuxin Zhou Modified comment(s), */
70 /* resulting in version 6.1 */
71 /* */
72 /**************************************************************************/
_nx_tcp_packet_send_probe(NX_TCP_SOCKET * socket_ptr,ULONG tx_sequence,UCHAR data)73 VOID _nx_tcp_packet_send_probe(NX_TCP_SOCKET *socket_ptr, ULONG tx_sequence, UCHAR data)
74 {
75
76 _nx_tcp_packet_send_control(socket_ptr, NX_TCP_ACK_BIT, tx_sequence,
77 socket_ptr -> nx_tcp_socket_rx_sequence, 0, 0, &data);
78
79 /* Setup a new delayed ACK timeout. */
80 socket_ptr -> nx_tcp_socket_delayed_ack_timeout = _nx_tcp_ack_timer_rate;
81 }
82
83
