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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* q_choke.c CHOKE.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Stephen Hemminger <shemminger@vyatta.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <math.h>
#include "utils.h"
#include "tc_util.h"
#include "tc_red.h"
static void explain(void)
{
fprintf(stderr,
"Usage: ... choke limit PACKETS bandwidth KBPS [ecn]\n"
" [ min PACKETS ] [ max PACKETS ] [ burst PACKETS ]\n");
}
static int choke_parse_opt(struct qdisc_util *qu, int argc, char **argv,
struct nlmsghdr *n, const char *dev)
{
struct tc_red_qopt opt = {};
unsigned int burst = 0;
unsigned int avpkt = 1000;
double probability = 0.02;
unsigned int rate = 0;
int ecn_ok = 0;
int wlog;
__u8 sbuf[256];
__u32 max_P;
struct rtattr *tail;
while (argc > 0) {
if (strcmp(*argv, "limit") == 0) {
NEXT_ARG();
if (get_unsigned(&opt.limit, *argv, 0)) {
fprintf(stderr, "Illegal \"limit\"\n");
return -1;
}
} else if (strcmp(*argv, "bandwidth") == 0) {
NEXT_ARG();
if (strchr(*argv, '%')) {
if (get_percent_rate(&rate, *argv, dev)) {
fprintf(stderr, "Illegal \"bandwidth\"\n");
return -1;
}
} else if (get_rate(&rate, *argv)) {
fprintf(stderr, "Illegal \"bandwidth\"\n");
return -1;
}
} else if (strcmp(*argv, "ecn") == 0) {
ecn_ok = 1;
} else if (strcmp(*argv, "min") == 0) {
NEXT_ARG();
if (get_unsigned(&opt.qth_min, *argv, 0)) {
fprintf(stderr, "Illegal \"min\"\n");
return -1;
}
} else if (strcmp(*argv, "max") == 0) {
NEXT_ARG();
if (get_unsigned(&opt.qth_max, *argv, 0)) {
fprintf(stderr, "Illegal \"max\"\n");
return -1;
}
} else if (strcmp(*argv, "burst") == 0) {
NEXT_ARG();
if (get_unsigned(&burst, *argv, 0)) {
fprintf(stderr, "Illegal \"burst\"\n");
return -1;
}
} else if (strcmp(*argv, "avpkt") == 0) {
NEXT_ARG();
if (get_size(&avpkt, *argv)) {
fprintf(stderr, "Illegal \"avpkt\"\n");
return -1;
}
} else if (strcmp(*argv, "probability") == 0) {
NEXT_ARG();
if (sscanf(*argv, "%lg", &probability) != 1) {
fprintf(stderr, "Illegal \"probability\"\n");
return -1;
}
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
if (!rate || !opt.limit) {
fprintf(stderr, "Required parameter (bandwidth, limit) is missing\n");
return -1;
}
/* Compute default min/max thresholds based on
Sally Floyd's recommendations:
http://www.icir.org/floyd/REDparameters.txt
*/
if (!opt.qth_max)
opt.qth_max = opt.limit / 4;
if (!opt.qth_min)
opt.qth_min = opt.qth_max / 3;
if (!burst)
burst = (2 * opt.qth_min + opt.qth_max) / 3;
if (opt.qth_max > opt.limit) {
fprintf(stderr, "\"max\" is larger than \"limit\"\n");
return -1;
}
if (opt.qth_min >= opt.qth_max) {
fprintf(stderr, "\"min\" is not smaller than \"max\"\n");
return -1;
}
wlog = tc_red_eval_ewma(opt.qth_min*avpkt, burst, avpkt);
if (wlog < 0) {
fprintf(stderr, "CHOKE: failed to calculate EWMA constant.\n");
return -1;
}
if (wlog >= 10)
fprintf(stderr, "CHOKE: WARNING. Burst %d seems to be too large.\n", burst);
opt.Wlog = wlog;
wlog = tc_red_eval_P(opt.qth_min*avpkt, opt.qth_max*avpkt, probability);
if (wlog < 0) {
fprintf(stderr, "CHOKE: failed to calculate probability.\n");
return -1;
}
opt.Plog = wlog;
wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf);
if (wlog < 0) {
fprintf(stderr, "CHOKE: failed to calculate idle damping table.\n");
return -1;
}
opt.Scell_log = wlog;
if (ecn_ok)
opt.flags |= TC_RED_ECN;
tail = addattr_nest(n, 1024, TCA_OPTIONS);
addattr_l(n, 1024, TCA_CHOKE_PARMS, &opt, sizeof(opt));
addattr_l(n, 1024, TCA_CHOKE_STAB, sbuf, 256);
max_P = probability * pow(2, 32);
addattr_l(n, 1024, TCA_CHOKE_MAX_P, &max_P, sizeof(max_P));
addattr_nest_end(n, tail);
return 0;
}
static int choke_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_CHOKE_MAX+1];
const struct tc_red_qopt *qopt;
__u32 max_P = 0;
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_CHOKE_MAX, opt);
if (tb[TCA_CHOKE_PARMS] == NULL)
return -1;
qopt = RTA_DATA(tb[TCA_CHOKE_PARMS]);
if (RTA_PAYLOAD(tb[TCA_CHOKE_PARMS]) < sizeof(*qopt))
return -1;
if (tb[TCA_CHOKE_MAX_P] &&
RTA_PAYLOAD(tb[TCA_CHOKE_MAX_P]) >= sizeof(__u32))
max_P = rta_getattr_u32(tb[TCA_CHOKE_MAX_P]);
print_uint(PRINT_ANY, "limit", "limit %up ", qopt->limit);
print_uint(PRINT_ANY, "min", "min %up ", qopt->qth_min);
print_uint(PRINT_ANY, "max", "max %up ", qopt->qth_max);
tc_red_print_flags(qopt->flags);
if (show_details) {
print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
if (max_P)
print_float(PRINT_ANY, "probability",
"probability %lg ", max_P / pow(2, 32));
else
print_uint(PRINT_ANY, "Plog", "Plog %u ", qopt->Plog);
print_uint(PRINT_ANY, "Scell_log", "Scell_log %u",
qopt->Scell_log);
}
return 0;
}
static int choke_print_xstats(struct qdisc_util *qu, FILE *f,
struct rtattr *xstats)
{
struct tc_choke_xstats *st;
if (xstats == NULL)
return 0;
if (RTA_PAYLOAD(xstats) < sizeof(*st))
return -1;
st = RTA_DATA(xstats);
print_uint(PRINT_ANY, "marked", " marked %u", st->marked);
print_uint(PRINT_ANY, "early", " early %u", st->early);
print_uint(PRINT_ANY, "pdrop", " pdrop %u", st->pdrop);
print_uint(PRINT_ANY, "other", " other %u", st->other);
print_uint(PRINT_ANY, "matched", " matched %u", st->matched);
return 0;
}
struct qdisc_util choke_qdisc_util = {
.id = "choke",
.parse_qopt = choke_parse_opt,
.print_qopt = choke_print_opt,
.print_xstats = choke_print_xstats,
};
|
