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11#include <stdio.h>
12#include <stdlib.h>
13#include <unistd.h>
14#include <fcntl.h>
15#include <sys/socket.h>
16#include <netinet/in.h>
17#include <arpa/inet.h>
18#include <string.h>
19#include <math.h>
20
21#include "utils.h"
22#include "tc_util.h"
23
24#include "tc_red.h"
25
26#ifdef DEBUG
27#define DPRINTF(format, args...) fprintf(stderr, format, ##args)
28#else
29#define DPRINTF(format, args...)
30#endif
31
32static void explain(void)
33{
34 fprintf(stderr,
35 "Usage: tc qdisc { add | replace | change } ... gred setup vqs NUMBER\n"
36 " default DEFAULT_VQ [ grio ] [ limit BYTES ] [ecn] [harddrop]\n"
37 " tc qdisc change ... gred vq VQ [ prio VALUE ] limit BYTES\n"
38 " min BYTES max BYTES avpkt BYTES [ burst PACKETS ]\n"
39 " [ probability PROBABILITY ] [ bandwidth KBPS ] [ecn] [harddrop]\n");
40}
41
42static int init_gred(const struct qdisc_util *qu, int argc, char **argv,
43 struct nlmsghdr *n)
44{
45
46 struct rtattr *tail;
47 struct tc_gred_sopt opt = { 0 };
48 __u32 limit = 0;
49
50 opt.def_DP = MAX_DPs;
51
52 while (argc > 0) {
53 DPRINTF("init_gred: invoked with %s\n", *argv);
54 if (strcmp(*argv, "vqs") == 0 ||
55 strcmp(*argv, "DPs") == 0) {
56 NEXT_ARG();
57 if (get_unsigned(&opt.DPs, *argv, 10)) {
58 fprintf(stderr, "Illegal \"vqs\"\n");
59 return -1;
60 } else if (opt.DPs > MAX_DPs) {
61 fprintf(stderr, "GRED: only %u VQs are currently supported\n",
62 MAX_DPs);
63 return -1;
64 }
65 } else if (strcmp(*argv, "default") == 0) {
66 if (opt.DPs == 0) {
67 fprintf(stderr, "\"default\" must be defined after \"vqs\"\n");
68 return -1;
69 }
70 NEXT_ARG();
71 if (get_unsigned(&opt.def_DP, *argv, 10)) {
72 fprintf(stderr, "Illegal \"default\"\n");
73 return -1;
74 } else if (opt.def_DP >= opt.DPs) {
75 fprintf(stderr, "\"default\" must be less than \"vqs\"\n");
76 return -1;
77 }
78 } else if (strcmp(*argv, "grio") == 0) {
79 opt.grio = 1;
80 } else if (strcmp(*argv, "limit") == 0) {
81 NEXT_ARG();
82 if (get_size(&limit, *argv)) {
83 fprintf(stderr, "Illegal \"limit\"\n");
84 return -1;
85 }
86 } else if (strcmp(*argv, "ecn") == 0) {
87 opt.flags |= TC_RED_ECN;
88 } else if (strcmp(*argv, "harddrop") == 0) {
89 opt.flags |= TC_RED_HARDDROP;
90 } else if (strcmp(*argv, "help") == 0) {
91 explain();
92 return -1;
93 } else {
94 fprintf(stderr, "What is \"%s\"?\n", *argv);
95 explain();
96 return -1;
97 }
98 argc--; argv++;
99 }
100
101 if (!opt.DPs || opt.def_DP == MAX_DPs) {
102 fprintf(stderr, "Illegal gred setup parameters\n");
103 return -1;
104 }
105
106 DPRINTF("TC_GRED: sending DPs=%u def_DP=%u\n", opt.DPs, opt.def_DP);
107 n->nlmsg_flags |= NLM_F_CREATE;
108 tail = addattr_nest(n, 1024, TCA_OPTIONS);
109 addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
110 if (limit)
111 addattr32(n, 1024, TCA_GRED_LIMIT, limit);
112 addattr_nest_end(n, tail);
113 return 0;
114}
115
116
117
118static int gred_parse_opt(const struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
119{
120 struct rtattr *tail, *entry, *vqs;
121 int ok = 0;
122 struct tc_gred_qopt opt = { 0 };
123 unsigned int burst = 0;
124 unsigned int avpkt = 0;
125 unsigned int flags = 0;
126 double probability = 0.02;
127 unsigned int rate = 0;
128 int parm;
129 __u8 sbuf[256];
130 __u32 max_P;
131
132 opt.DP = MAX_DPs;
133
134 while (argc > 0) {
135 if (strcmp(*argv, "limit") == 0) {
136 NEXT_ARG();
137 if (get_size(&opt.limit, *argv)) {
138 fprintf(stderr, "Illegal \"limit\"\n");
139 return -1;
140 }
141 ok++;
142 } else if (strcmp(*argv, "setup") == 0) {
143 if (ok) {
144 fprintf(stderr, "Illegal \"setup\"\n");
145 return -1;
146 }
147 return init_gred(qu, argc-1, argv+1, n);
148 } else if (strcmp(*argv, "min") == 0) {
149 NEXT_ARG();
150 if (get_size(&opt.qth_min, *argv)) {
151 fprintf(stderr, "Illegal \"min\"\n");
152 return -1;
153 }
154 ok++;
155 } else if (strcmp(*argv, "max") == 0) {
156 NEXT_ARG();
157 if (get_size(&opt.qth_max, *argv)) {
158 fprintf(stderr, "Illegal \"max\"\n");
159 return -1;
160 }
161 ok++;
162 } else if (strcmp(*argv, "vq") == 0 ||
163 strcmp(*argv, "DP") == 0) {
164 NEXT_ARG();
165 if (get_unsigned(&opt.DP, *argv, 10)) {
166 fprintf(stderr, "Illegal \"vq\"\n");
167 return -1;
168 } else if (opt.DP >= MAX_DPs) {
169 fprintf(stderr, "GRED: only %u VQs are currently supported\n",
170 MAX_DPs);
171 return -1;
172 }
173 ok++;
174 } else if (strcmp(*argv, "burst") == 0) {
175 NEXT_ARG();
176 if (get_unsigned(&burst, *argv, 0)) {
177 fprintf(stderr, "Illegal \"burst\"\n");
178 return -1;
179 }
180 ok++;
181 } else if (strcmp(*argv, "avpkt") == 0) {
182 NEXT_ARG();
183 if (get_size(&avpkt, *argv)) {
184 fprintf(stderr, "Illegal \"avpkt\"\n");
185 return -1;
186 }
187 ok++;
188 } else if (strcmp(*argv, "probability") == 0) {
189 NEXT_ARG();
190 if (sscanf(*argv, "%lg", &probability) != 1) {
191 fprintf(stderr, "Illegal \"probability\"\n");
192 return -1;
193 }
194 ok++;
195 } else if (strcmp(*argv, "prio") == 0) {
196 NEXT_ARG();
197 opt.prio = strtol(*argv, (char **)NULL, 10);
198
199 ok++;
200 } else if (strcmp(*argv, "bandwidth") == 0) {
201 NEXT_ARG();
202 if (strchr(*argv, '%')) {
203 if (get_percent_rate(&rate, *argv, dev)) {
204 fprintf(stderr, "Illegal \"bandwidth\"\n");
205 return -1;
206 }
207 } else if (get_rate(&rate, *argv)) {
208 fprintf(stderr, "Illegal \"bandwidth\"\n");
209 return -1;
210 }
211 ok++;
212 } else if (strcmp(*argv, "ecn") == 0) {
213 flags |= TC_RED_ECN;
214 } else if (strcmp(*argv, "harddrop") == 0) {
215 flags |= TC_RED_HARDDROP;
216 } else if (strcmp(*argv, "help") == 0) {
217 explain();
218 return -1;
219 } else {
220 fprintf(stderr, "What is \"%s\"?\n", *argv);
221 explain();
222 return -1;
223 }
224 argc--; argv++;
225 }
226
227 if (!ok) {
228 explain();
229 return -1;
230 }
231 if (opt.DP == MAX_DPs || !opt.limit || !opt.qth_min || !opt.qth_max ||
232 !avpkt) {
233 fprintf(stderr, "Required parameter (vq, limit, min, max, avpkt) is missing\n");
234 return -1;
235 }
236 if (!burst) {
237 burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
238 fprintf(stderr, "GRED: set burst to %u\n", burst);
239 }
240 if (!rate) {
241 get_rate(&rate, "10Mbit");
242 fprintf(stderr, "GRED: set bandwidth to 10Mbit\n");
243 }
244 if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
245 fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
246 return -1;
247 }
248 if (parm >= 10)
249 fprintf(stderr, "GRED: WARNING. Burst %u seems to be too large.\n",
250 burst);
251 opt.Wlog = parm;
252 if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
253 fprintf(stderr, "GRED: failed to calculate probability.\n");
254 return -1;
255 }
256 opt.Plog = parm;
257 if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
258 {
259 fprintf(stderr, "GRED: failed to calculate idle damping table.\n");
260 return -1;
261 }
262 opt.Scell_log = parm;
263
264 tail = addattr_nest(n, 1024, TCA_OPTIONS);
265 addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
266 addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
267 max_P = probability * pow(2, 32);
268 addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
269
270 vqs = addattr_nest(n, 1024, TCA_GRED_VQ_LIST);
271 entry = addattr_nest(n, 1024, TCA_GRED_VQ_ENTRY);
272 addattr32(n, 1024, TCA_GRED_VQ_DP, opt.DP);
273 addattr32(n, 1024, TCA_GRED_VQ_FLAGS, flags);
274 addattr_nest_end(n, entry);
275 addattr_nest_end(n, vqs);
276
277 addattr_nest_end(n, tail);
278 return 0;
279}
280
281struct tc_gred_info {
282 bool flags_present;
283 __u64 bytes;
284 __u32 packets;
285 __u32 backlog;
286 __u32 prob_drop;
287 __u32 prob_mark;
288 __u32 forced_drop;
289 __u32 forced_mark;
290 __u32 pdrop;
291 __u32 other;
292 __u32 flags;
293};
294
295static void
296gred_parse_vqs(struct tc_gred_info *info, struct rtattr *vqs)
297{
298 int rem = RTA_PAYLOAD(vqs);
299 unsigned int offset = 0;
300
301 while (rem > offset) {
302 struct rtattr *tb_entry[TCA_GRED_VQ_ENTRY_MAX + 1] = {};
303 struct rtattr *tb[TCA_GRED_VQ_MAX + 1] = {};
304 struct rtattr *entry;
305 unsigned int len;
306 unsigned int dp;
307
308 entry = RTA_DATA(vqs) + offset;
309
310 parse_rtattr(tb_entry, TCA_GRED_VQ_ENTRY_MAX, entry,
311 rem - offset);
312 len = RTA_LENGTH(RTA_PAYLOAD(entry));
313 offset += len;
314
315 if (!tb_entry[TCA_GRED_VQ_ENTRY]) {
316 fprintf(stderr,
317 "ERROR: Failed to parse Virtual Queue entry\n");
318 continue;
319 }
320
321 parse_rtattr_nested(tb, TCA_GRED_VQ_MAX,
322 tb_entry[TCA_GRED_VQ_ENTRY]);
323
324 if (!tb[TCA_GRED_VQ_DP]) {
325 fprintf(stderr,
326 "ERROR: Virtual Queue without DP attribute\n");
327 continue;
328 }
329
330 dp = rta_getattr_u32(tb[TCA_GRED_VQ_DP]);
331
332 if (tb[TCA_GRED_VQ_STAT_BYTES])
333 info[dp].bytes =
334 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BYTES]);
335 if (tb[TCA_GRED_VQ_STAT_PACKETS])
336 info[dp].packets =
337 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PACKETS]);
338 if (tb[TCA_GRED_VQ_STAT_BACKLOG])
339 info[dp].backlog =
340 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BACKLOG]);
341 if (tb[TCA_GRED_VQ_STAT_PROB_DROP])
342 info[dp].prob_drop =
343 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_DROP]);
344 if (tb[TCA_GRED_VQ_STAT_PROB_MARK])
345 info[dp].prob_mark =
346 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_MARK]);
347 if (tb[TCA_GRED_VQ_STAT_FORCED_DROP])
348 info[dp].forced_drop =
349 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_DROP]);
350 if (tb[TCA_GRED_VQ_STAT_FORCED_MARK])
351 info[dp].forced_mark =
352 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_MARK]);
353 if (tb[TCA_GRED_VQ_STAT_PDROP])
354 info[dp].pdrop =
355 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PDROP]);
356 if (tb[TCA_GRED_VQ_STAT_OTHER])
357 info[dp].other =
358 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_OTHER]);
359 info[dp].flags_present = !!tb[TCA_GRED_VQ_FLAGS];
360 if (tb[TCA_GRED_VQ_FLAGS])
361 info[dp].flags =
362 rta_getattr_u32(tb[TCA_GRED_VQ_FLAGS]);
363 }
364}
365
366static void
367gred_print_stats(struct tc_gred_info *info, struct tc_gred_qopt *qopt)
368{
369 __u64 bytes = info ? info->bytes : qopt->bytesin;
370
371 if (!is_json_context())
372 printf("\n Queue size: ");
373
374 print_size(PRINT_ANY, "qave", "average %s ", qopt->qave);
375 print_size(PRINT_ANY, "backlog", "current %s ", qopt->backlog);
376
377 if (!is_json_context())
378 printf("\n Dropped packets: ");
379
380 if (info) {
381 print_uint(PRINT_ANY, "forced_drop", "forced %u ",
382 info->forced_drop);
383 print_uint(PRINT_ANY, "prob_drop", "early %u ",
384 info->prob_drop);
385 print_uint(PRINT_ANY, "pdrop", "pdrop %u ", info->pdrop);
386 print_uint(PRINT_ANY, "other", "other %u ", info->other);
387
388 if (!is_json_context())
389 printf("\n Marked packets: ");
390 print_uint(PRINT_ANY, "forced_mark", "forced %u ",
391 info->forced_mark);
392 print_uint(PRINT_ANY, "prob_mark", "early %u ",
393 info->prob_mark);
394 } else {
395 print_uint(PRINT_ANY, "forced_drop", "forced %u ",
396 qopt->forced);
397 print_uint(PRINT_ANY, "prob_drop", "early %u ", qopt->early);
398 print_uint(PRINT_ANY, "pdrop", "pdrop %u ", qopt->pdrop);
399 print_uint(PRINT_ANY, "other", "other %u ", qopt->other);
400 }
401
402 if (!is_json_context())
403 printf("\n Total packets: ");
404
405 print_uint(PRINT_ANY, "packets", "%u ", qopt->packets);
406 print_size(PRINT_ANY, "bytes", "(%s) ", bytes);
407}
408
409static int gred_print_opt(const struct qdisc_util *qu, FILE *f, struct rtattr *opt)
410{
411 struct tc_gred_info infos[MAX_DPs] = {};
412 struct rtattr *tb[TCA_GRED_MAX + 1];
413 struct tc_gred_sopt *sopt;
414 struct tc_gred_qopt *qopt;
415 bool vq_info = false;
416 __u32 *max_p = NULL;
417 __u32 *limit = NULL;
418 unsigned int i;
419
420 if (opt == NULL)
421 return 0;
422
423 parse_rtattr_nested(tb, TCA_GRED_MAX, opt);
424
425 if (tb[TCA_GRED_PARMS] == NULL)
426 return -1;
427
428 if (tb[TCA_GRED_MAX_P] &&
429 RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
430 max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
431
432 if (tb[TCA_GRED_LIMIT] &&
433 RTA_PAYLOAD(tb[TCA_GRED_LIMIT]) == sizeof(__u32))
434 limit = RTA_DATA(tb[TCA_GRED_LIMIT]);
435
436 sopt = RTA_DATA(tb[TCA_GRED_DPS]);
437 qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
438 if (RTA_PAYLOAD(tb[TCA_GRED_DPS]) < sizeof(*sopt) ||
439 RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
440 fprintf(f, "\n GRED received message smaller than expected\n");
441 return -1;
442 }
443
444 if (tb[TCA_GRED_VQ_LIST]) {
445 gred_parse_vqs(infos, tb[TCA_GRED_VQ_LIST]);
446 vq_info = true;
447 }
448
449 print_uint(PRINT_ANY, "dp_cnt", "vqs %u ", sopt->DPs);
450 print_uint(PRINT_ANY, "dp_default", "default %u ", sopt->def_DP);
451
452 if (sopt->grio)
453 print_bool(PRINT_ANY, "grio", "grio ", true);
454 else
455 print_bool(PRINT_ANY, "grio", NULL, false);
456
457 if (limit)
458 print_size(PRINT_ANY, "limit", "limit %s ", *limit);
459
460 tc_red_print_flags(sopt->flags);
461
462 open_json_array(PRINT_JSON, "vqs");
463 for (i = 0; i < MAX_DPs; i++, qopt++) {
464 if (qopt->DP >= MAX_DPs)
465 continue;
466
467 open_json_object(NULL);
468
469 print_uint(PRINT_ANY, "vq", "\n vq %u ", qopt->DP);
470 print_hhu(PRINT_ANY, "prio", "prio %hhu ", qopt->prio);
471 print_size(PRINT_ANY, "limit", "limit %s ", qopt->limit);
472 print_size(PRINT_ANY, "min", "min %s ", qopt->qth_min);
473 print_size(PRINT_ANY, "max", "max %s ", qopt->qth_max);
474
475 if (infos[i].flags_present)
476 tc_red_print_flags(infos[i].flags);
477
478 if (show_details) {
479 print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
480 if (max_p)
481 print_float(PRINT_ANY, "probability",
482 "probability %lg ",
483 max_p[i] / pow(2, 32));
484 else
485 print_uint(PRINT_ANY, "Plog", "Plog %u ",
486 qopt->Plog);
487 print_uint(PRINT_ANY, "Scell_log", "Scell_log %u ",
488 qopt->Scell_log);
489 }
490 if (show_stats)
491 gred_print_stats(vq_info ? &infos[i] : NULL, qopt);
492 close_json_object();
493 }
494 close_json_array(PRINT_JSON, "vqs");
495 return 0;
496}
497
498struct qdisc_util gred_qdisc_util = {
499 .id = "gred",
500 .parse_qopt = gred_parse_opt,
501 .print_qopt = gred_print_opt,
502};
503
