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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <getopt.h>
#include <math.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_RATEEST.h>
/* hack to pass raw values to final_check */
static struct xt_rateest_target_info *RATEEST_info;
static unsigned int interval;
static unsigned int ewma_log;
static void
RATEEST_help(void)
{
printf(
"RATEEST target options:\n"
" --rateest-name name Rate estimator name\n"
" --rateest-interval sec Rate measurement interval in seconds\n"
" --rateest-ewmalog value Rate measurement averaging time constant\n");
}
enum RATEEST_options {
RATEEST_OPT_NAME,
RATEEST_OPT_INTERVAL,
RATEEST_OPT_EWMALOG,
};
static const struct option RATEEST_opts[] = {
{ "rateest-name", 1, NULL, RATEEST_OPT_NAME },
{ "rateest-interval", 1, NULL, RATEEST_OPT_INTERVAL },
{ "rateest-ewmalog", 1, NULL, RATEEST_OPT_EWMALOG },
{ .name = NULL },
};
/* Copied from iproute */
#define TIME_UNITS_PER_SEC 1000000
static int
RATEEST_get_time(unsigned int *time, const char *str)
{
double t;
char *p;
t = strtod(str, &p);
if (p == str)
return -1;
if (*p) {
if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
strcasecmp(p, "secs")==0)
t *= TIME_UNITS_PER_SEC;
else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
strcasecmp(p, "msecs") == 0)
t *= TIME_UNITS_PER_SEC/1000;
else if (strcasecmp(p, "us") == 0 || strcasecmp(p, "usec")==0 ||
strcasecmp(p, "usecs") == 0)
t *= TIME_UNITS_PER_SEC/1000000;
else
return -1;
}
*time = t;
return 0;
}
static void
RATEEST_print_time(unsigned int time)
{
double tmp = time;
if (tmp >= TIME_UNITS_PER_SEC)
printf("%.1fs ", tmp/TIME_UNITS_PER_SEC);
else if (tmp >= TIME_UNITS_PER_SEC/1000)
printf("%.1fms ", tmp/(TIME_UNITS_PER_SEC/1000));
else
printf("%uus ", time);
}
static void
RATEEST_init(struct xt_entry_target *target)
{
interval = 0;
ewma_log = 0;
}
static int
RATEEST_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_rateest_target_info *info = (void *)(*target)->data;
RATEEST_info = info;
switch (c) {
case RATEEST_OPT_NAME:
if (*flags & (1 << c))
exit_error(PARAMETER_PROBLEM,
"RATEEST: can't specify --rateest-name twice");
*flags |= 1 << c;
strncpy(info->name, optarg, sizeof(info->name) - 1);
break;
case RATEEST_OPT_INTERVAL:
if (*flags & (1 << c))
exit_error(PARAMETER_PROBLEM,
"RATEEST: can't specify --rateest-interval twice");
*flags |= 1 << c;
if (RATEEST_get_time(&interval, optarg) < 0)
exit_error(PARAMETER_PROBLEM,
"RATEEST: bad interval value `%s'", optarg);
break;
case RATEEST_OPT_EWMALOG:
if (*flags & (1 << c))
exit_error(PARAMETER_PROBLEM,
"RATEEST: can't specify --rateest-ewmalog twice");
*flags |= 1 << c;
if (RATEEST_get_time(&ewma_log, optarg) < 0)
exit_error(PARAMETER_PROBLEM,
"RATEEST: bad ewmalog value `%s'", optarg);
break;
default:
return 0;
}
return 1;
}
static void
RATEEST_final_check(unsigned int flags)
{
struct xt_rateest_target_info *info = RATEEST_info;
if (!(flags & (1 << RATEEST_OPT_NAME)))
exit_error(PARAMETER_PROBLEM, "RATEEST: no name specified");
if (!(flags & (1 << RATEEST_OPT_INTERVAL)))
exit_error(PARAMETER_PROBLEM, "RATEEST: no interval specified");
if (!(flags & (1 << RATEEST_OPT_EWMALOG)))
exit_error(PARAMETER_PROBLEM, "RATEEST: no ewmalog specified");
for (info->interval = 0; info->interval <= 5; info->interval++) {
if (interval <= (1 << info->interval) * (TIME_UNITS_PER_SEC / 4))
break;
}
if (info->interval > 5)
exit_error(PARAMETER_PROBLEM,
"RATEEST: interval value is too large");
info->interval -= 2;
for (info->ewma_log = 1; info->ewma_log < 32; info->ewma_log++) {
double w = 1.0 - 1.0 / (1 << info->ewma_log);
if (interval / (-log(w)) > ewma_log)
break;
}
info->ewma_log--;
if (info->ewma_log == 0 || info->ewma_log >= 31)
exit_error(PARAMETER_PROBLEM,
"RATEEST: ewmalog value is out of range");
}
static void
__RATEEST_print(const struct xt_entry_target *target, const char *prefix)
{
struct xt_rateest_target_info *info = (void *)target->data;
unsigned int local_interval;
unsigned int local_ewma_log;
local_interval = (TIME_UNITS_PER_SEC << (info->interval + 2)) / 4;
local_ewma_log = local_interval * (1 << (info->ewma_log));
printf("%sname %s ", prefix, info->name);
printf("%sinterval ", prefix);
RATEEST_print_time(local_interval);
printf("%sewmalog ", prefix);
RATEEST_print_time(local_ewma_log);
}
static void
RATEEST_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
__RATEEST_print(target, "");
}
static void
RATEEST_save(const void *ip, const struct xt_entry_target *target)
{
__RATEEST_print(target, "--rateest-");
}
static struct xtables_target rateest_tg_reg = {
.family = AF_UNSPEC,
.name = "RATEEST",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_rateest_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_rateest_target_info)),
.help = RATEEST_help,
.init = RATEEST_init,
.parse = RATEEST_parse,
.final_check = RATEEST_final_check,
.print = RATEEST_print,
.save = RATEEST_save,
.extra_opts = RATEEST_opts,
};
void _init(void)
{
xtables_register_target(&rateest_tg_reg);
}
|
