Newer
Older
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
/*
* Copyright (C) 2024 iopsys Software Solutions AB
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* Author: Amin Ben Romdhane <amin.benromdhane@iopsys.eu>
*
*/
#include "utils.h"
#define TCP_WMEM_PATH "/proc/sys/net/ipv4/tcp_wmem"
#define TCP_CONGESTION_CONTROL_PATH "/proc/sys/net/ipv4/tcp_congestion_control"
/*************************************************************
* COMMON FUNCTIONS
**************************************************************/
static int read_file_content(const char *file_path, char *buffer, size_t buffer_size)
{
int fd = open(file_path, O_RDONLY);
if (fd == -1)
return -1;
ssize_t bytes_read = read(fd, buffer, buffer_size - 1);
if (bytes_read == -1) {
close(fd);
return -1;
}
buffer[bytes_read] = '\0'; // Null-terminate the buffer
close(fd);
return 0;
}
static int read_tcp_write_memory_limits(int *min_size, int *default_size, int *max_size)
{
char buffer[128] = {0};
// Read TCP memory settings
if (read_file_content(TCP_WMEM_PATH, buffer, sizeof(buffer)) == -1)
return -1;
// Parse the memory sizes from the file contents
if (sscanf(buffer, "%d %d %d", min_size, default_size, max_size) != 3)
return -1;
return 0;
}
static int get_supported_congestion_controls(char *output, size_t output_size)
{
const char *delim = " ";
char *token, buffer[128];
size_t pos = 0;
// Read available congestion control algorithms
if (read_file_content(TCP_CONGESTION_CONTROL_PATH, buffer, sizeof(buffer)) == -1)
return -1;
// Parse the supported algorithms and store them in the output buffer
token = strtok(buffer, delim);
while (token != NULL) {
if (strstr(token, "reno"))
pos += snprintf(&output[pos], output_size - pos, "Reno,");
else if (strstr(token, "cubic"))
pos += snprintf(&output[pos], output_size - pos, "Cubic,");
else if (strstr(token, "newreno"))
pos += snprintf(&output[pos], output_size - pos, "New Reno,");
else if (strstr(token, "vegas"))
pos += snprintf(&output[pos], output_size - pos, "Vegas,");
else if (strstr(token, "tahoe"))
pos += snprintf(&output[pos], output_size - pos, "Tahoe,");
token = strtok(NULL, delim);
}
// Remove the trailing comma, if any
if (pos > 0)
output[pos - 1] = '\0';
return 0;
}
/*************************************************************
* GET & SET PARAM
**************************************************************/
static int get_DeviceInfoNetworkProperties_MaxTCPWindowSize(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
int min = 0, def = 0, max = 0;
int res = read_tcp_write_memory_limits(&min, &def, &max);
dmasprintf(value, "%d", !res ? max : 0);
return 0;
}
static int get_DeviceInfoNetworkProperties_TCPImplementation(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
char list[256] = {0};
int res = get_supported_congestion_controls(list, sizeof(list));
*value = dmstrdup(!res ? list : "");
return 0;
}
/**********************************************************************************************************************************
* OBJ & LEAF DEFINITION
***********************************************************************************************************************************/
/* *** Device.DeviceInfo.NetworkProperties. *** */
DMLEAF tDeviceInfoNetworkPropertiesParams[] = {
/* PARAM, permission, type, getvalue, setvalue, bbfdm_type */
{"MaxTCPWindowSize", &DMREAD, DMT_UNINT, get_DeviceInfoNetworkProperties_MaxTCPWindowSize, NULL, BBFDM_BOTH},
{"TCPImplementation", &DMREAD, DMT_STRING, get_DeviceInfoNetworkProperties_TCPImplementation, NULL, BBFDM_BOTH},
{0}
};