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
/**************************************************************************/
/* */
/* 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 */
/** */
/** Packet Pool Mangement (Packet) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#ifdef NX_IPSEC_ENABLE
#include "nx_ipsec.h"
#endif /* NX_IPSEC_ENABLE */
/* Bring in externs for caller checking code. */
NX_CALLER_CHECKING_EXTERNS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxe_ip_max_payload_size_find PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the max IP payload computation */
/* service. */
/* */
/* INPUT */
/* */
/* ip_ptr Pointer to IP instance */
/* src_address Packet Source Address */
/* dest_address Packet Destination Address */
/* protocol Protocol type */
/* src_port Source port number, in host */
/* byte order. */
/* dest_port Destination port number, */
/* in host byte order. */
/* start_offset_ptr Pointer to storage space that */
/* contains amount of offset */
/* for payload. */
/* payload_length_ptr Pointer to storage space that */
/* indicates the amount of */
/* payload data that would not */
/* cause IP fragmentation. */
/* */
/* OUTPUT */
/* */
/* status Completion Code. */
/* */
/* CALLS */
/* */
/* _nx_max_payload_size_get The acutal function that */
/* computes the max payload */
/* size. */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _nxe_ip_max_payload_size_find(NX_IP *ip_ptr,
NXD_ADDRESS *dest_address,
UINT if_index,
UINT src_port,
UINT dest_port,
ULONG protocol,
ULONG *start_offset_ptr,
ULONG *payload_length_ptr)
{
/* Check for valid pointer to an IP instance. */
if ((ip_ptr == NX_NULL) || (ip_ptr -> nx_ip_id != NX_IP_ID))
{
return(NX_PTR_ERROR);
}
/* Destination address must be valid. */
if (dest_address == NX_NULL)
{
return(NX_PTR_ERROR);
}
if ((dest_address -> nxd_ip_version != NX_IP_VERSION_V4) &&
(dest_address -> nxd_ip_version != NX_IP_VERSION_V6))
{
return(NX_IP_ADDRESS_ERROR);
}
if ((protocol != NX_PROTOCOL_UDP) &&
(protocol != NX_PROTOCOL_TCP))
{
return(NX_NOT_SUPPORTED);
}
/* Check for appropriate caller. */
NX_INIT_AND_THREADS_CALLER_CHECKING
return(_nx_ip_max_payload_size_find(ip_ptr, dest_address, if_index, src_port, dest_port,
protocol, start_offset_ptr, payload_length_ptr));
}