tc/q_netem.c

   1 /*
   2  * q_netem.c            NETEM.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Stephen Hemminger <shemminger@linux-foundation.org>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <math.h>
  16 #include <ctype.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19 #include <stdint.h>
  20 #include <sys/socket.h>
  21 #include <netinet/in.h>
  22 #include <arpa/inet.h>
  23 #include <string.h>
  24 #include <errno.h>
  25
  26 #include "utils.h"
  27 #include "tc_util.h"
  28 #include "tc_common.h"
  29
  30 static void explain(void)
  31 {
  32         fprintf(stderr,
  33 "Usage: ... netem [ limit PACKETS ]\n" \
  34 "                 [ delay TIME [ JITTER [CORRELATION]]]\n" \
  35 "                 [ distribution {uniform|normal|pareto|paretonormal} ]\n" \
  36 "                 [ corrupt PERCENT [CORRELATION]]\n" \
  37 "                 [ duplicate PERCENT [CORRELATION]]\n" \
  38 "                 [ loss random PERCENT [CORRELATION]]\n" \
  39 "                 [ loss state P13 [P31 [P32 [P23 P14]]]\n" \
  40 "                 [ loss gemodel PERCENT [R [1-H [1-K]]]\n" \
  41 "                 [ ecn ]\n" \
  42 "                 [ reorder PRECENT [CORRELATION] [ gap DISTANCE ]]\n" \
  43 "                 [ rate RATE [PACKETOVERHEAD] [CELLSIZE] [CELLOVERHEAD]]\n");
  44 }
  45
  46 static void explain1(const char *arg)
  47 {
  48         fprintf(stderr, "Illegal \"%s\"\n", arg);
  49 }
  50
  51 /* Upper bound on size of distribution
  52  *  really (TCA_BUF_MAX - other headers) / sizeof (__s16)
  53  */
  54 #define MAX_DIST        (16*1024)
  55
  56 /* scaled value used to percent of maximum. */
  57 static void set_percent(__u32 *percent, double per)
  58 {
  59         *percent = rint(per * UINT32_MAX);
  60 }
  61
  62 static int get_percent(__u32 *percent, const char *str)
  63 {
  64         double per;
  65
  66         if (parse_percent(&per, str))
  67                 return -1;
  68
  69         set_percent(percent, per);
  70         return 0;
  71 }
  72
  73 static void print_percent(char *buf, int len, __u32 per)
  74 {
  75         snprintf(buf, len, "%g%%", (100. * per) / UINT32_MAX);
  76 }
  77
  78 static char *sprint_percent(__u32 per, char *buf)
  79 {
  80         print_percent(buf, SPRINT_BSIZE-1, per);
  81         return buf;
  82 }
  83
  84 /*
  85  * Simplistic file parser for distrbution data.
  86  * Format is:
  87  *      # comment line(s)
  88  *      data0 data1 ...
  89  */
  90 static int get_distribution(const char *type, __s16 *data, int maxdata)
  91 {
  92         FILE *f;
  93         int n;
  94         long x;
  95         size_t len;
  96         char *line = NULL;
  97         char name[128];
  98
  99         snprintf(name, sizeof(name), "%s/%s.dist", get_tc_lib(), type);
 100         if ((f = fopen(name, "r")) == NULL) {
 101                 fprintf(stderr, "No distribution data for %s (%s: %s)\n",
 102                         type, name, strerror(errno));
 103                 return -1;
 104         }
 105
 106         n = 0;
 107         while (getline(&line, &len, f) != -1) {
 108                 char *p, *endp;
 109
 110                 if (*line == '\n' || *line == '#')
 111                         continue;
 112
 113                 for (p = line; ; p = endp) {
 114                         x = strtol(p, &endp, 0);
 115                         if (endp == p)
 116                                 break;
 117
 118                         if (n >= maxdata) {
 119                                 fprintf(stderr, "%s: too much data\n",
 120                                         name);
 121                                 n = -1;
 122                                 goto error;
 123                         }
 124                         data[n++] = x;
 125                 }
 126         }
 127  error:
 128         free(line);
 129         fclose(f);
 130         return n;
 131 }
 132
 133 #define NEXT_IS_NUMBER() (NEXT_ARG_OK() && isdigit(argv[1][0]))
 134 #define NEXT_IS_SIGNED_NUMBER() \
 135         (NEXT_ARG_OK() && (isdigit(argv[1][0]) || argv[1][0] == '-'))
 136
 137 /* Adjust for the fact that psched_ticks aren't always usecs
 138    (based on kernel PSCHED_CLOCK configuration */
 139 static int get_ticks(__u32 *ticks, const char *str)
 140 {
 141         unsigned int t;
 142
 143         if (get_time(&t, str))
 144                 return -1;
 145
 146         if (tc_core_time2big(t)) {
 147                 fprintf(stderr, "Illegal %u time (too large)\n", t);
 148                 return -1;
 149         }
 150
 151         *ticks = tc_core_time2tick(t);
 152         return 0;
 153 }
 154
 155 static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 156                            struct nlmsghdr *n, const char *dev)
 157 {
 158         int dist_size = 0;
 159         struct rtattr *tail;
 160         struct tc_netem_qopt opt = { .limit = 1000 };
 161         struct tc_netem_corr cor = {};
 162         struct tc_netem_reorder reorder = {};
 163         struct tc_netem_corrupt corrupt = {};
 164         struct tc_netem_gimodel gimodel;
 165         struct tc_netem_gemodel gemodel;
 166         struct tc_netem_rate rate = {};
 167         __s16 *dist_data = NULL;
 168         __u16 loss_type = NETEM_LOSS_UNSPEC;
 169         int present[__TCA_NETEM_MAX] = {};
 170         __u64 rate64 = 0;
 171
 172         for ( ; argc > 0; --argc, ++argv) {
 173                 if (matches(*argv, "limit") == 0) {
 174                         NEXT_ARG();
 175                         if (get_size(&opt.limit, *argv)) {
 176                                 explain1("limit");
 177                                 return -1;
 178                         }
 179                 } else if (matches(*argv, "latency") == 0 ||
 180                            matches(*argv, "delay") == 0) {
 181                         NEXT_ARG();
 182                         if (get_ticks(&opt.latency, *argv)) {
 183                                 explain1("latency");
 184                                 return -1;
 185                         }
 186
 187                         if (NEXT_IS_NUMBER()) {
 188                                 NEXT_ARG();
 189                                 if (get_ticks(&opt.jitter, *argv)) {
 190                                         explain1("latency");
 191                                         return -1;
 192                                 }
 193
 194                                 if (NEXT_IS_NUMBER()) {
 195                                         NEXT_ARG();
 196                                         ++present[TCA_NETEM_CORR];
 197                                         if (get_percent(&cor.delay_corr, *argv)) {
 198                                                 explain1("latency");
 199                                                 return -1;
 200                                         }
 201                                 }
 202                         }
 203                 } else if (matches(*argv, "loss") == 0 ||
 204                            matches(*argv, "drop") == 0) {
 205                         if (opt.loss > 0 || loss_type != NETEM_LOSS_UNSPEC) {
 206                                 explain1("duplicate loss argument\n");
 207                                 return -1;
 208                         }
 209
 210                         NEXT_ARG();
 211                         /* Old (deprecated) random loss model syntax */
 212                         if (isdigit(argv[0][0]))
 213                                 goto random_loss_model;
 214
 215                         if (!strcmp(*argv, "random")) {
 216                                 NEXT_ARG();
 217                         random_loss_model:
 218                                 if (get_percent(&opt.loss, *argv)) {
 219                                         explain1("loss percent");
 220                                         return -1;
 221                                 }
 222                                 if (NEXT_IS_NUMBER()) {
 223                                         NEXT_ARG();
 224                                         ++present[TCA_NETEM_CORR];
 225                                         if (get_percent(&cor.loss_corr, *argv)) {
 226                                                 explain1("loss correllation");
 227                                                 return -1;
 228                                         }
 229                                 }
 230                         } else if (!strcmp(*argv, "state")) {
 231                                 double p13;
 232
 233                                 NEXT_ARG();
 234                                 if (parse_percent(&p13, *argv)) {
 235                                         explain1("loss p13");
 236                                         return -1;
 237                                 }
 238
 239                                 /* set defaults */
 240                                 set_percent(&gimodel.p13, p13);
 241                                 set_percent(&gimodel.p31, 1. - p13);
 242                                 set_percent(&gimodel.p32, 0);
 243                                 set_percent(&gimodel.p23, 1.);
 244                                 set_percent(&gimodel.p14, 0);
 245                                 loss_type = NETEM_LOSS_GI;
 246
 247                                 if (!NEXT_IS_NUMBER())
 248                                         continue;
 249                                 NEXT_ARG();
 250                                 if (get_percent(&gimodel.p31, *argv)) {
 251                                         explain1("loss p31");
 252                                         return -1;
 253                                 }
 254
 255                                 if (!NEXT_IS_NUMBER())
 256                                         continue;
 257                                 NEXT_ARG();
 258                                 if (get_percent(&gimodel.p32, *argv)) {
 259                                         explain1("loss p32");
 260                                         return -1;
 261                                 }
 262
 263                                 if (!NEXT_IS_NUMBER())
 264                                         continue;
 265                                 NEXT_ARG();
 266                                 if (get_percent(&gimodel.p23, *argv)) {
 267                                         explain1("loss p23");
 268                                         return -1;
 269                                 }
 270                                 if (!NEXT_IS_NUMBER())
 271                                         continue;
 272                                 NEXT_ARG();
 273                                 if (get_percent(&gimodel.p14, *argv)) {
 274                                         explain1("loss p14");
 275                                         return -1;
 276                                 }
 277
 278                         } else if (!strcmp(*argv, "gemodel")) {
 279                                 NEXT_ARG();
 280                                 if (get_percent(&gemodel.p, *argv)) {
 281                                         explain1("loss gemodel p");
 282                                         return -1;
 283                                 }
 284
 285                                 /* set defaults */
 286                                 set_percent(&gemodel.r, 1.);
 287                                 set_percent(&gemodel.h, 0);
 288                                 set_percent(&gemodel.k1, 0);
 289                                 loss_type = NETEM_LOSS_GE;
 290
 291                                 if (!NEXT_IS_NUMBER())
 292                                         continue;
 293                                 NEXT_ARG();
 294                                 if (get_percent(&gemodel.r, *argv)) {
 295                                         explain1("loss gemodel r");
 296                                         return -1;
 297                                 }
 298
 299                                 if (!NEXT_IS_NUMBER())
 300                                         continue;
 301                                 NEXT_ARG();
 302                                 if (get_percent(&gemodel.h, *argv)) {
 303                                         explain1("loss gemodel h");
 304                                         return -1;
 305                                 }
 306                                 /* netem option is "1-h" but kernel
 307                                  * expects "h".
 308                                  */
 309                                 gemodel.h = UINT32_MAX - gemodel.h;
 310
 311                                 if (!NEXT_IS_NUMBER())
 312                                         continue;
 313                                 NEXT_ARG();
 314                                 if (get_percent(&gemodel.k1, *argv)) {
 315                                         explain1("loss gemodel k");
 316                                         return -1;
 317                                 }
 318                         } else {
 319                                 fprintf(stderr, "Unknown loss parameter: %s\n",
 320                                         *argv);
 321                                 return -1;
 322                         }
 323                 } else if (matches(*argv, "ecn") == 0) {
 324                         present[TCA_NETEM_ECN] = 1;
 325                 } else if (matches(*argv, "reorder") == 0) {
 326                         NEXT_ARG();
 327                         present[TCA_NETEM_REORDER] = 1;
 328                         if (get_percent(&reorder.probability, *argv)) {
 329                                 explain1("reorder");
 330                                 return -1;
 331                         }
 332                         if (NEXT_IS_NUMBER()) {
 333                                 NEXT_ARG();
 334                                 ++present[TCA_NETEM_CORR];
 335                                 if (get_percent(&reorder.correlation, *argv)) {
 336                                         explain1("reorder");
 337                                         return -1;
 338                                 }
 339                         }
 340                 } else if (matches(*argv, "corrupt") == 0) {
 341                         NEXT_ARG();
 342                         present[TCA_NETEM_CORRUPT] = 1;
 343                         if (get_percent(&corrupt.probability, *argv)) {
 344                                 explain1("corrupt");
 345                                 return -1;
 346                         }
 347                         if (NEXT_IS_NUMBER()) {
 348                                 NEXT_ARG();
 349                                 ++present[TCA_NETEM_CORR];
 350                                 if (get_percent(&corrupt.correlation, *argv)) {
 351                                         explain1("corrupt");
 352                                         return -1;
 353                                 }
 354                         }
 355                 } else if (matches(*argv, "gap") == 0) {
 356                         NEXT_ARG();
 357                         if (get_u32(&opt.gap, *argv, 0)) {
 358                                 explain1("gap");
 359                                 return -1;
 360                         }
 361                 } else if (matches(*argv, "duplicate") == 0) {
 362                         NEXT_ARG();
 363                         if (get_percent(&opt.duplicate, *argv)) {
 364                                 explain1("duplicate");
 365                                 return -1;
 366                         }
 367                         if (NEXT_IS_NUMBER()) {
 368                                 NEXT_ARG();
 369                                 if (get_percent(&cor.dup_corr, *argv)) {
 370                                         explain1("duplicate");
 371                                         return -1;
 372                                 }
 373                         }
 374                 } else if (matches(*argv, "distribution") == 0) {
 375                         NEXT_ARG();
 376                         dist_data = calloc(sizeof(dist_data[0]), MAX_DIST);
 377                         dist_size = get_distribution(*argv, dist_data, MAX_DIST);
 378                         if (dist_size <= 0) {
 379                                 free(dist_data);
 380                                 return -1;
 381                         }
 382                 } else if (matches(*argv, "rate") == 0) {
 383                         ++present[TCA_NETEM_RATE];
 384                         NEXT_ARG();
 385                         if (strchr(*argv, '%')) {
 386                                 if (get_percent_rate64(&rate64, *argv, dev)) {
 387                                         explain1("rate");
 388                                         return -1;
 389                                 }
 390                         } else if (get_rate64(&rate64, *argv)) {
 391                                 explain1("rate");
 392                                 return -1;
 393                         }
 394                         if (NEXT_IS_SIGNED_NUMBER()) {
 395                                 NEXT_ARG();
 396                                 if (get_s32(&rate.packet_overhead, *argv, 0)) {
 397                                         explain1("rate");
 398                                         return -1;
 399                                 }
 400                         }
 401                         if (NEXT_IS_NUMBER()) {
 402                                 NEXT_ARG();
 403                                 if (get_u32(&rate.cell_size, *argv, 0)) {
 404                                         explain1("rate");
 405                                         return -1;
 406                                 }
 407                         }
 408                         if (NEXT_IS_SIGNED_NUMBER()) {
 409                                 NEXT_ARG();
 410                                 if (get_s32(&rate.cell_overhead, *argv, 0)) {
 411                                         explain1("rate");
 412                                         return -1;
 413                                 }
 414                         }
 415                 } else if (strcmp(*argv, "help") == 0) {
 416                         explain();
 417                         return -1;
 418                 } else {
 419                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 420                         explain();
 421                         return -1;
 422                 }
 423         }
 424
 425         tail = NLMSG_TAIL(n);
 426
 427         if (reorder.probability) {
 428                 if (opt.latency == 0) {
 429                         fprintf(stderr, "reordering not possible without specifying some delay\n");
 430                         explain();
 431                         return -1;
 432                 }
 433                 if (opt.gap == 0)
 434                         opt.gap = 1;
 435         } else if (opt.gap > 0) {
 436                 fprintf(stderr, "gap specified without reorder probability\n");
 437                 explain();
 438                 return -1;
 439         }
 440
 441         if (present[TCA_NETEM_ECN]) {
 442                 if (opt.loss <= 0 && loss_type == NETEM_LOSS_UNSPEC) {
 443                         fprintf(stderr, "ecn requested without loss model\n");
 444                         explain();
 445                         return -1;
 446                 }
 447         }
 448
 449         if (dist_data && (opt.latency == 0 || opt.jitter == 0)) {
 450                 fprintf(stderr, "distribution specified but no latency and jitter values\n");
 451                 explain();
 452                 return -1;
 453         }
 454
 455         if (addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)) < 0)
 456                 return -1;
 457
 458         if (present[TCA_NETEM_CORR] &&
 459             addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor)) < 0)
 460                 return -1;
 461
 462         if (present[TCA_NETEM_REORDER] &&
 463             addattr_l(n, 1024, TCA_NETEM_REORDER, &reorder, sizeof(reorder)) < 0)
 464                 return -1;
 465
 466         if (present[TCA_NETEM_ECN] &&
 467             addattr_l(n, 1024, TCA_NETEM_ECN, &present[TCA_NETEM_ECN],
 468                       sizeof(present[TCA_NETEM_ECN])) < 0)
 469                 return -1;
 470
 471         if (present[TCA_NETEM_CORRUPT] &&
 472             addattr_l(n, 1024, TCA_NETEM_CORRUPT, &corrupt, sizeof(corrupt)) < 0)
 473                 return -1;
 474
 475         if (loss_type != NETEM_LOSS_UNSPEC) {
 476                 struct rtattr *start;
 477
 478                 start = addattr_nest(n, 1024, TCA_NETEM_LOSS | NLA_F_NESTED);
 479                 if (loss_type == NETEM_LOSS_GI) {
 480                         if (addattr_l(n, 1024, NETEM_LOSS_GI,
 481                                       &gimodel, sizeof(gimodel)) < 0)
 482                                 return -1;
 483                 } else if (loss_type == NETEM_LOSS_GE) {
 484                         if (addattr_l(n, 1024, NETEM_LOSS_GE,
 485                                       &gemodel, sizeof(gemodel)) < 0)
 486                                 return -1;
 487                 } else {
 488                         fprintf(stderr, "loss in the weeds!\n");
 489                         return -1;
 490                 }
 491
 492                 addattr_nest_end(n, start);
 493         }
 494
 495         if (present[TCA_NETEM_RATE]) {
 496                 if (rate64 >= (1ULL << 32)) {
 497                         if (addattr_l(n, 1024,
 498                                       TCA_NETEM_RATE64, &rate64, sizeof(rate64)) < 0)
 499                                 return -1;
 500                         rate.rate = ~0U;
 501                 } else {
 502                         rate.rate = rate64;
 503                 }
 504                 if (addattr_l(n, 1024, TCA_NETEM_RATE, &rate, sizeof(rate)) < 0)
 505                         return -1;
 506         }
 507
 508         if (dist_data) {
 509                 if (addattr_l(n, MAX_DIST * sizeof(dist_data[0]),
 510                               TCA_NETEM_DELAY_DIST,
 511                               dist_data, dist_size * sizeof(dist_data[0])) < 0)
 512                         return -1;
 513                 free(dist_data);
 514         }
 515         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 516         return 0;
 517 }
 518
 519 static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 520 {
 521         const struct tc_netem_corr *cor = NULL;
 522         const struct tc_netem_reorder *reorder = NULL;
 523         const struct tc_netem_corrupt *corrupt = NULL;
 524         const struct tc_netem_gimodel *gimodel = NULL;
 525         const struct tc_netem_gemodel *gemodel = NULL;
 526         int *ecn = NULL;
 527         struct tc_netem_qopt qopt;
 528         const struct tc_netem_rate *rate = NULL;
 529         int len;
 530         __u64 rate64 = 0;
 531
 532         SPRINT_BUF(b1);
 533
 534         if (opt == NULL)
 535                 return 0;
 536
 537         len = RTA_PAYLOAD(opt) - sizeof(qopt);
 538         if (len < 0) {
 539                 fprintf(stderr, "options size error\n");
 540                 return -1;
 541         }
 542         memcpy(&qopt, RTA_DATA(opt), sizeof(qopt));
 543
 544         if (len > 0) {
 545                 struct rtattr *tb[TCA_NETEM_MAX+1];
 546
 547                 parse_rtattr(tb, TCA_NETEM_MAX, RTA_DATA(opt) + sizeof(qopt),
 548                              len);
 549
 550                 if (tb[TCA_NETEM_CORR]) {
 551                         if (RTA_PAYLOAD(tb[TCA_NETEM_CORR]) < sizeof(*cor))
 552                                 return -1;
 553                         cor = RTA_DATA(tb[TCA_NETEM_CORR]);
 554                 }
 555                 if (tb[TCA_NETEM_REORDER]) {
 556                         if (RTA_PAYLOAD(tb[TCA_NETEM_REORDER]) < sizeof(*reorder))
 557                                 return -1;
 558                         reorder = RTA_DATA(tb[TCA_NETEM_REORDER]);
 559                 }
 560                 if (tb[TCA_NETEM_CORRUPT]) {
 561                         if (RTA_PAYLOAD(tb[TCA_NETEM_CORRUPT]) < sizeof(*corrupt))
 562                                 return -1;
 563                         corrupt = RTA_DATA(tb[TCA_NETEM_CORRUPT]);
 564                 }
 565                 if (tb[TCA_NETEM_LOSS]) {
 566                         struct rtattr *lb[NETEM_LOSS_MAX + 1];
 567
 568                         parse_rtattr_nested(lb, NETEM_LOSS_MAX, tb[TCA_NETEM_LOSS]);
 569                         if (lb[NETEM_LOSS_GI])
 570                                 gimodel = RTA_DATA(lb[NETEM_LOSS_GI]);
 571                         if (lb[NETEM_LOSS_GE])
 572                                 gemodel = RTA_DATA(lb[NETEM_LOSS_GE]);
 573                 }
 574                 if (tb[TCA_NETEM_RATE]) {
 575                         if (RTA_PAYLOAD(tb[TCA_NETEM_RATE]) < sizeof(*rate))
 576                                 return -1;
 577                         rate = RTA_DATA(tb[TCA_NETEM_RATE]);
 578                 }
 579                 if (tb[TCA_NETEM_ECN]) {
 580                         if (RTA_PAYLOAD(tb[TCA_NETEM_ECN]) < sizeof(*ecn))
 581                                 return -1;
 582                         ecn = RTA_DATA(tb[TCA_NETEM_ECN]);
 583                 }
 584                 if (tb[TCA_NETEM_RATE64]) {
 585                         if (RTA_PAYLOAD(tb[TCA_NETEM_RATE64]) < sizeof(rate64))
 586                                 return -1;
 587                         rate64 = rta_getattr_u64(tb[TCA_NETEM_RATE64]);
 588                 }
 589         }
 590
 591         fprintf(f, "limit %d", qopt.limit);
 592
 593         if (qopt.latency) {
 594                 fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1));
 595
 596                 if (qopt.jitter) {
 597                         fprintf(f, "  %s", sprint_ticks(qopt.jitter, b1));
 598                         if (cor && cor->delay_corr)
 599                                 fprintf(f, " %s", sprint_percent(cor->delay_corr, b1));
 600                 }
 601         }
 602
 603         if (qopt.loss) {
 604                 fprintf(f, " loss %s", sprint_percent(qopt.loss, b1));
 605                 if (cor && cor->loss_corr)
 606                         fprintf(f, " %s", sprint_percent(cor->loss_corr, b1));
 607         }
 608
 609         if (gimodel) {
 610                 fprintf(f, " loss state p13 %s", sprint_percent(gimodel->p13, b1));
 611                 fprintf(f, " p31 %s", sprint_percent(gimodel->p31, b1));
 612                 fprintf(f, " p32 %s", sprint_percent(gimodel->p32, b1));
 613                 fprintf(f, " p23 %s", sprint_percent(gimodel->p23, b1));
 614                 fprintf(f, " p14 %s", sprint_percent(gimodel->p14, b1));
 615         }
 616
 617         if (gemodel) {
 618                 fprintf(f, " loss gemodel p %s",
 619                         sprint_percent(gemodel->p, b1));
 620                 fprintf(f, " r %s", sprint_percent(gemodel->r, b1));
 621                 fprintf(f, " 1-h %s", sprint_percent(UINT32_MAX -
 622                                                      gemodel->h, b1));
 623                 fprintf(f, " 1-k %s", sprint_percent(gemodel->k1, b1));
 624         }
 625
 626         if (qopt.duplicate) {
 627                 fprintf(f, " duplicate %s",
 628                         sprint_percent(qopt.duplicate, b1));
 629                 if (cor && cor->dup_corr)
 630                         fprintf(f, " %s", sprint_percent(cor->dup_corr, b1));
 631         }
 632
 633         if (reorder && reorder->probability) {
 634                 fprintf(f, " reorder %s",
 635                         sprint_percent(reorder->probability, b1));
 636                 if (reorder->correlation)
 637                         fprintf(f, " %s",
 638                                 sprint_percent(reorder->correlation, b1));
 639         }
 640
 641         if (corrupt && corrupt->probability) {
 642                 fprintf(f, " corrupt %s",
 643                         sprint_percent(corrupt->probability, b1));
 644                 if (corrupt->correlation)
 645                         fprintf(f, " %s",
 646                                 sprint_percent(corrupt->correlation, b1));
 647         }
 648
 649         if (rate && rate->rate) {
 650                 if (rate64)
 651                         fprintf(f, " rate %s", sprint_rate(rate64, b1));
 652                 else
 653                         fprintf(f, " rate %s", sprint_rate(rate->rate, b1));
 654                 if (rate->packet_overhead)
 655                         fprintf(f, " packetoverhead %d", rate->packet_overhead);
 656                 if (rate->cell_size)
 657                         fprintf(f, " cellsize %u", rate->cell_size);
 658                 if (rate->cell_overhead)
 659                         fprintf(f, " celloverhead %d", rate->cell_overhead);
 660         }
 661
 662         if (ecn)
 663                 fprintf(f, " ecn ");
 664
 665         if (qopt.gap)
 666                 fprintf(f, " gap %lu", (unsigned long)qopt.gap);
 667
 668
 669         return 0;
 670 }
 671
 672 struct qdisc_util netem_qdisc_util = {
 673         .id             = "netem",
 674         .parse_qopt     = netem_parse_opt,
 675         .print_qopt     = netem_print_opt,
 676 };