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 <syslog.h>
  19 #include <fcntl.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 static const double max_percent_value = 0xffffffff;
  57
  58 /* scaled value used to percent of maximum. */
  59 static void set_percent(__u32 *percent, double per)
  60 {
  61         *percent = (unsigned int) rint(per * max_percent_value);
  62 }
  63
  64
  65 /* Parse either a fraction '.3' or percent '30%
  66  * return: 0 = ok, -1 = error, 1 = out of range
  67  */
  68 static int parse_percent(double *val, const char *str)
  69 {
  70         char *p;
  71
  72         *val = strtod(str, &p) / 100.;
  73         if (*p && strcmp(p, "%"))
  74                 return -1;
  75
  76         return 0;
  77 }
  78
  79 static int get_percent(__u32 *percent, const char *str)
  80 {
  81         double per;
  82
  83         if (parse_percent(&per, str))
  84                 return -1;
  85
  86         set_percent(percent, per);
  87         return 0;
  88 }
  89
  90 static void print_percent(char *buf, int len, __u32 per)
  91 {
  92         snprintf(buf, len, "%g%%", 100. * (double) per / max_percent_value);
  93 }
  94
  95 static char *sprint_percent(__u32 per, char *buf)
  96 {
  97         print_percent(buf, SPRINT_BSIZE-1, per);
  98         return buf;
  99 }
 100
 101 /*
 102  * Simplistic file parser for distrbution data.
 103  * Format is:
 104  *      # comment line(s)
 105  *      data0 data1 ...
 106  */
 107 static int get_distribution(const char *type, __s16 *data, int maxdata)
 108 {
 109         FILE *f;
 110         int n;
 111         long x;
 112         size_t len;
 113         char *line = NULL;
 114         char name[128];
 115
 116         snprintf(name, sizeof(name), "%s/%s.dist", get_tc_lib(), type);
 117         if ((f = fopen(name, "r")) == NULL) {
 118                 fprintf(stderr, "No distribution data for %s (%s: %s)\n",
 119                         type, name, strerror(errno));
 120                 return -1;
 121         }
 122
 123         n = 0;
 124         while (getline(&line, &len, f) != -1) {
 125                 char *p, *endp;
 126
 127                 if (*line == '\n' || *line == '#')
 128                         continue;
 129
 130                 for (p = line; ; p = endp) {
 131                         x = strtol(p, &endp, 0);
 132                         if (endp == p)
 133                                 break;
 134
 135                         if (n >= maxdata) {
 136                                 fprintf(stderr, "%s: too much data\n",
 137                                         name);
 138                                 n = -1;
 139                                 goto error;
 140                         }
 141                         data[n++] = x;
 142                 }
 143         }
 144  error:
 145         free(line);
 146         fclose(f);
 147         return n;
 148 }
 149
 150 #define NEXT_IS_NUMBER() (NEXT_ARG_OK() && isdigit(argv[1][0]))
 151 #define NEXT_IS_SIGNED_NUMBER() \
 152         (NEXT_ARG_OK() && (isdigit(argv[1][0]) || argv[1][0] == '-'))
 153
 154 /* Adjust for the fact that psched_ticks aren't always usecs
 155    (based on kernel PSCHED_CLOCK configuration */
 156 static int get_ticks(__u32 *ticks, const char *str)
 157 {
 158         unsigned int t;
 159
 160         if (get_time(&t, str))
 161                 return -1;
 162
 163         if (tc_core_time2big(t)) {
 164                 fprintf(stderr, "Illegal %u time (too large)\n", t);
 165                 return -1;
 166         }
 167
 168         *ticks = tc_core_time2tick(t);
 169         return 0;
 170 }
 171
 172 static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
 173                            struct nlmsghdr *n)
 174 {
 175         int dist_size = 0;
 176         struct rtattr *tail;
 177         struct tc_netem_qopt opt = { .limit = 1000 };
 178         struct tc_netem_corr cor = {};
 179         struct tc_netem_reorder reorder = {};
 180         struct tc_netem_corrupt corrupt = {};
 181         struct tc_netem_gimodel gimodel;
 182         struct tc_netem_gemodel gemodel;
 183         struct tc_netem_rate rate = {};
 184         __s16 *dist_data = NULL;
 185         __u16 loss_type = NETEM_LOSS_UNSPEC;
 186         int present[__TCA_NETEM_MAX] = {};
 187         __u64 rate64 = 0;
 188
 189         for ( ; argc > 0; --argc, ++argv) {
 190                 if (matches(*argv, "limit") == 0) {
 191                         NEXT_ARG();
 192                         if (get_size(&opt.limit, *argv)) {
 193                                 explain1("limit");
 194                                 return -1;
 195                         }
 196                 } else if (matches(*argv, "latency") == 0 ||
 197                            matches(*argv, "delay") == 0) {
 198                         NEXT_ARG();
 199                         if (get_ticks(&opt.latency, *argv)) {
 200                                 explain1("latency");
 201                                 return -1;
 202                         }
 203
 204                         if (NEXT_IS_NUMBER()) {
 205                                 NEXT_ARG();
 206                                 if (get_ticks(&opt.jitter, *argv)) {
 207                                         explain1("latency");
 208                                         return -1;
 209                                 }
 210
 211                                 if (NEXT_IS_NUMBER()) {
 212                                         NEXT_ARG();
 213                                         ++present[TCA_NETEM_CORR];
 214                                         if (get_percent(&cor.delay_corr, *argv)) {
 215                                                 explain1("latency");
 216                                                 return -1;
 217                                         }
 218                                 }
 219                         }
 220                 } else if (matches(*argv, "loss") == 0 ||
 221                            matches(*argv, "drop") == 0) {
 222                         if (opt.loss > 0 || loss_type != NETEM_LOSS_UNSPEC) {
 223                                 explain1("duplicate loss argument\n");
 224                                 return -1;
 225                         }
 226
 227                         NEXT_ARG();
 228                         /* Old (deprecated) random loss model syntax */
 229                         if (isdigit(argv[0][0]))
 230                                 goto random_loss_model;
 231
 232                         if (!strcmp(*argv, "random")) {
 233                                 NEXT_ARG();
 234 random_loss_model:
 235                                 if (get_percent(&opt.loss, *argv)) {
 236                                         explain1("loss percent");
 237                                         return -1;
 238                                 }
 239                                 if (NEXT_IS_NUMBER()) {
 240                                         NEXT_ARG();
 241                                         ++present[TCA_NETEM_CORR];
 242                                         if (get_percent(&cor.loss_corr, *argv)) {
 243                                                 explain1("loss correllation");
 244                                                 return -1;
 245                                         }
 246                                 }
 247                         } else if (!strcmp(*argv, "state")) {
 248                                 double p13;
 249
 250                                 NEXT_ARG();
 251                                 if (parse_percent(&p13, *argv)) {
 252                                         explain1("loss p13");
 253                                         return -1;
 254                                 }
 255
 256                                 /* set defaults */
 257                                 set_percent(&gimodel.p13, p13);
 258                                 set_percent(&gimodel.p31, 1. - p13);
 259                                 set_percent(&gimodel.p32, 0);
 260                                 set_percent(&gimodel.p23, 1.);
 261                                 set_percent(&gimodel.p14, 0);
 262                                 loss_type = NETEM_LOSS_GI;
 263
 264                                 if (!NEXT_IS_NUMBER())
 265                                         continue;
 266                                 NEXT_ARG();
 267                                 if (get_percent(&gimodel.p31, *argv)) {
 268                                         explain1("loss p31");
 269                                         return -1;
 270                                 }
 271
 272                                 if (!NEXT_IS_NUMBER())
 273                                         continue;
 274                                 NEXT_ARG();
 275                                 if (get_percent(&gimodel.p32, *argv)) {
 276                                         explain1("loss p32");
 277                                         return -1;
 278                                 }
 279
 280                                 if (!NEXT_IS_NUMBER())
 281                                         continue;
 282                                 NEXT_ARG();
 283                                 if (get_percent(&gimodel.p23, *argv)) {
 284                                         explain1("loss p23");
 285                                         return -1;
 286                                 }
 287                                 if (!NEXT_IS_NUMBER())
 288                                         continue;
 289                                 NEXT_ARG();
 290                                 if (get_percent(&gimodel.p14, *argv)) {
 291                                         explain1("loss p14");
 292                                         return -1;
 293                                 }
 294
 295                         } else if (!strcmp(*argv, "gemodel")) {
 296                                 NEXT_ARG();
 297                                 if (get_percent(&gemodel.p, *argv)) {
 298                                         explain1("loss gemodel p");
 299                                         return -1;
 300                                 }
 301
 302                                 /* set defaults */
 303                                 set_percent(&gemodel.r, 1.);
 304                                 set_percent(&gemodel.h, 0);
 305                                 set_percent(&gemodel.k1, 0);
 306                                 loss_type = NETEM_LOSS_GE;
 307
 308                                 if (!NEXT_IS_NUMBER())
 309                                         continue;
 310                                 NEXT_ARG();
 311                                 if (get_percent(&gemodel.r, *argv)) {
 312                                         explain1("loss gemodel r");
 313                                         return -1;
 314                                 }
 315
 316                                 if (!NEXT_IS_NUMBER())
 317                                         continue;
 318                                 NEXT_ARG();
 319                                 if (get_percent(&gemodel.h, *argv)) {
 320                                         explain1("loss gemodel h");
 321                                         return -1;
 322                                 }
 323                                 /* netem option is "1-h" but kernel
 324                                  * expects "h".
 325                                  */
 326                                 gemodel.h = max_percent_value - gemodel.h;
 327
 328                                 if (!NEXT_IS_NUMBER())
 329                                         continue;
 330                                 NEXT_ARG();
 331                                 if (get_percent(&gemodel.k1, *argv)) {
 332                                         explain1("loss gemodel k");
 333                                         return -1;
 334                                 }
 335                         } else {
 336                                 fprintf(stderr, "Unknown loss parameter: %s\n",
 337                                         *argv);
 338                                 return -1;
 339                         }
 340                 } else if (matches(*argv, "ecn") == 0) {
 341                                 present[TCA_NETEM_ECN] = 1;
 342                 } else if (matches(*argv, "reorder") == 0) {
 343                         NEXT_ARG();
 344                         present[TCA_NETEM_REORDER] = 1;
 345                         if (get_percent(&reorder.probability, *argv)) {
 346                                 explain1("reorder");
 347                                 return -1;
 348                         }
 349                         if (NEXT_IS_NUMBER()) {
 350                                 NEXT_ARG();
 351                                 ++present[TCA_NETEM_CORR];
 352                                 if (get_percent(&reorder.correlation, *argv)) {
 353                                         explain1("reorder");
 354                                         return -1;
 355                                 }
 356                         }
 357                 } else if (matches(*argv, "corrupt") == 0) {
 358                         NEXT_ARG();
 359                         present[TCA_NETEM_CORRUPT] = 1;
 360                         if (get_percent(&corrupt.probability, *argv)) {
 361                                 explain1("corrupt");
 362                                 return -1;
 363                         }
 364                         if (NEXT_IS_NUMBER()) {
 365                                 NEXT_ARG();
 366                                 ++present[TCA_NETEM_CORR];
 367                                 if (get_percent(&corrupt.correlation, *argv)) {
 368                                         explain1("corrupt");
 369                                         return -1;
 370                                 }
 371                         }
 372                 } else if (matches(*argv, "gap") == 0) {
 373                         NEXT_ARG();
 374                         if (get_u32(&opt.gap, *argv, 0)) {
 375                                 explain1("gap");
 376                                 return -1;
 377                         }
 378                 } else if (matches(*argv, "duplicate") == 0) {
 379                         NEXT_ARG();
 380                         if (get_percent(&opt.duplicate, *argv)) {
 381                                 explain1("duplicate");
 382                                 return -1;
 383                         }
 384                         if (NEXT_IS_NUMBER()) {
 385                                 NEXT_ARG();
 386                                 if (get_percent(&cor.dup_corr, *argv)) {
 387                                         explain1("duplicate");
 388                                         return -1;
 389                                 }
 390                         }
 391                 } else if (matches(*argv, "distribution") == 0) {
 392                         NEXT_ARG();
 393                         dist_data = calloc(sizeof(dist_data[0]), MAX_DIST);
 394                         dist_size = get_distribution(*argv, dist_data, MAX_DIST);
 395                         if (dist_size <= 0) {
 396                                 free(dist_data);
 397                                 return -1;
 398                         }
 399                 } else if (matches(*argv, "rate") == 0) {
 400                         ++present[TCA_NETEM_RATE];
 401                         NEXT_ARG();
 402                         if (get_rate64(&rate64, *argv)) {
 403                                 explain1("rate");
 404                                 return -1;
 405                         }
 406                         if (NEXT_IS_SIGNED_NUMBER()) {
 407                                 NEXT_ARG();
 408                                 if (get_s32(&rate.packet_overhead, *argv, 0)) {
 409                                         explain1("rate");
 410                                         return -1;
 411                                 }
 412                         }
 413                         if (NEXT_IS_NUMBER()) {
 414                                 NEXT_ARG();
 415                                 if (get_u32(&rate.cell_size, *argv, 0)) {
 416                                         explain1("rate");
 417                                         return -1;
 418                                 }
 419                         }
 420                         if (NEXT_IS_SIGNED_NUMBER()) {
 421                                 NEXT_ARG();
 422                                 if (get_s32(&rate.cell_overhead, *argv, 0)) {
 423                                         explain1("rate");
 424                                         return -1;
 425                                 }
 426                         }
 427                 } else if (strcmp(*argv, "help") == 0) {
 428                         explain();
 429                         return -1;
 430                 } else {
 431                         fprintf(stderr, "What is \"%s\"?\n", *argv);
 432                         explain();
 433                         return -1;
 434                 }
 435         }
 436
 437         tail = NLMSG_TAIL(n);
 438
 439         if (reorder.probability) {
 440                 if (opt.latency == 0) {
 441                         fprintf(stderr, "reordering not possible without specifying some delay\n");
 442                         explain();
 443                         return -1;
 444                 }
 445                 if (opt.gap == 0)
 446                         opt.gap = 1;
 447         } else if (opt.gap > 0) {
 448                 fprintf(stderr, "gap specified without reorder probability\n");
 449                 explain();
 450                 return -1;
 451         }
 452
 453         if (present[TCA_NETEM_ECN]) {
 454                 if (opt.loss <= 0 && loss_type == NETEM_LOSS_UNSPEC) {
 455                         fprintf(stderr, "ecn requested without loss model\n");
 456                         explain();
 457                         return -1;
 458                 }
 459         }
 460
 461         if (dist_data && (opt.latency == 0 || opt.jitter == 0)) {
 462                 fprintf(stderr, "distribution specified but no latency and jitter values\n");
 463                 explain();
 464                 return -1;
 465         }
 466
 467         if (addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)) < 0)
 468                 return -1;
 469
 470         if (present[TCA_NETEM_CORR] &&
 471             addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor)) < 0)
 472                         return -1;
 473
 474         if (present[TCA_NETEM_REORDER] &&
 475             addattr_l(n, 1024, TCA_NETEM_REORDER, &reorder, sizeof(reorder)) < 0)
 476                 return -1;
 477
 478         if (present[TCA_NETEM_ECN] &&
 479             addattr_l(n, 1024, TCA_NETEM_ECN, &present[TCA_NETEM_ECN],
 480                       sizeof(present[TCA_NETEM_ECN])) < 0)
 481                         return -1;
 482
 483         if (present[TCA_NETEM_CORRUPT] &&
 484             addattr_l(n, 1024, TCA_NETEM_CORRUPT, &corrupt, sizeof(corrupt)) < 0)
 485                 return -1;
 486
 487         if (loss_type != NETEM_LOSS_UNSPEC) {
 488                 struct rtattr *start;
 489
 490                 start = addattr_nest(n, 1024, TCA_NETEM_LOSS | NLA_F_NESTED);
 491                 if (loss_type == NETEM_LOSS_GI) {
 492                         if (addattr_l(n, 1024, NETEM_LOSS_GI,
 493                                       &gimodel, sizeof(gimodel)) < 0)
 494                             return -1;
 495                 } else if (loss_type == NETEM_LOSS_GE) {
 496                         if (addattr_l(n, 1024, NETEM_LOSS_GE,
 497                                       &gemodel, sizeof(gemodel)) < 0)
 498                             return -1;
 499                 } else {
 500                         fprintf(stderr, "loss in the weeds!\n");
 501                         return -1;
 502                 }
 503
 504                 addattr_nest_end(n, start);
 505         }
 506
 507         if (present[TCA_NETEM_RATE]) {
 508                 if (rate64 >= (1ULL << 32)) {
 509                         if (addattr_l(n, 1024,
 510                                       TCA_NETEM_RATE64, &rate64, sizeof(rate64)) < 0)
 511                                 return -1;
 512                         rate.rate = ~0U;
 513                 } else {
 514                         rate.rate = rate64;
 515                 }
 516                 if (addattr_l(n, 1024, TCA_NETEM_RATE, &rate, sizeof(rate)) < 0)
 517                         return -1;
 518         }
 519
 520         if (dist_data) {
 521                 if (addattr_l(n, MAX_DIST * sizeof(dist_data[0]),
 522                               TCA_NETEM_DELAY_DIST,
 523                               dist_data, dist_size * sizeof(dist_data[0])) < 0)
 524                         return -1;
 525                 free(dist_data);
 526         }
 527         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 528         return 0;
 529 }
 530
 531 static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 532 {
 533         const struct tc_netem_corr *cor = NULL;
 534         const struct tc_netem_reorder *reorder = NULL;
 535         const struct tc_netem_corrupt *corrupt = NULL;
 536         const struct tc_netem_gimodel *gimodel = NULL;
 537         const struct tc_netem_gemodel *gemodel = NULL;
 538         int *ecn = NULL;
 539         struct tc_netem_qopt qopt;
 540         const struct tc_netem_rate *rate = NULL;
 541         int len = RTA_PAYLOAD(opt) - sizeof(qopt);
 542         __u64 rate64 = 0;
 543
 544         SPRINT_BUF(b1);
 545
 546         if (opt == NULL)
 547                 return 0;
 548
 549         if (len < 0) {
 550                 fprintf(stderr, "options size error\n");
 551                 return -1;
 552         }
 553         memcpy(&qopt, RTA_DATA(opt), sizeof(qopt));
 554
 555         if (len > 0) {
 556                 struct rtattr *tb[TCA_NETEM_MAX+1];
 557
 558                 parse_rtattr(tb, TCA_NETEM_MAX, RTA_DATA(opt) + sizeof(qopt),
 559                              len);
 560
 561                 if (tb[TCA_NETEM_CORR]) {
 562                         if (RTA_PAYLOAD(tb[TCA_NETEM_CORR]) < sizeof(*cor))
 563                                 return -1;
 564                         cor = RTA_DATA(tb[TCA_NETEM_CORR]);
 565                 }
 566                 if (tb[TCA_NETEM_REORDER]) {
 567                         if (RTA_PAYLOAD(tb[TCA_NETEM_REORDER]) < sizeof(*reorder))
 568                                 return -1;
 569                         reorder = RTA_DATA(tb[TCA_NETEM_REORDER]);
 570                 }
 571                 if (tb[TCA_NETEM_CORRUPT]) {
 572                         if (RTA_PAYLOAD(tb[TCA_NETEM_CORRUPT]) < sizeof(*corrupt))
 573                                 return -1;
 574                         corrupt = RTA_DATA(tb[TCA_NETEM_CORRUPT]);
 575                 }
 576                 if (tb[TCA_NETEM_LOSS]) {
 577                         struct rtattr *lb[NETEM_LOSS_MAX + 1];
 578
 579                         parse_rtattr_nested(lb, NETEM_LOSS_MAX, tb[TCA_NETEM_LOSS]);
 580                         if (lb[NETEM_LOSS_GI])
 581                                 gimodel = RTA_DATA(lb[NETEM_LOSS_GI]);
 582                         if (lb[NETEM_LOSS_GE])
 583                                 gemodel = RTA_DATA(lb[NETEM_LOSS_GE]);
 584                 }
 585                 if (tb[TCA_NETEM_RATE]) {
 586                         if (RTA_PAYLOAD(tb[TCA_NETEM_RATE]) < sizeof(*rate))
 587                                 return -1;
 588                         rate = RTA_DATA(tb[TCA_NETEM_RATE]);
 589                 }
 590                 if (tb[TCA_NETEM_ECN]) {
 591                         if (RTA_PAYLOAD(tb[TCA_NETEM_ECN]) < sizeof(*ecn))
 592                                 return -1;
 593                         ecn = RTA_DATA(tb[TCA_NETEM_ECN]);
 594                 }
 595                 if (tb[TCA_NETEM_RATE64]) {
 596                         if (RTA_PAYLOAD(tb[TCA_NETEM_RATE64]) < sizeof(rate64))
 597                                 return -1;
 598                         rate64 = rta_getattr_u64(tb[TCA_NETEM_RATE64]);
 599                 }
 600         }
 601
 602         fprintf(f, "limit %d", qopt.limit);
 603
 604         if (qopt.latency) {
 605                 fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1));
 606
 607                 if (qopt.jitter) {
 608                         fprintf(f, "  %s", sprint_ticks(qopt.jitter, b1));
 609                         if (cor && cor->delay_corr)
 610                                 fprintf(f, " %s", sprint_percent(cor->delay_corr, b1));
 611                 }
 612         }
 613
 614         if (qopt.loss) {
 615                 fprintf(f, " loss %s", sprint_percent(qopt.loss, b1));
 616                 if (cor && cor->loss_corr)
 617                         fprintf(f, " %s", sprint_percent(cor->loss_corr, b1));
 618         }
 619
 620         if (gimodel) {
 621                 fprintf(f, " loss state p13 %s", sprint_percent(gimodel->p13, b1));
 622                 fprintf(f, " p31 %s", sprint_percent(gimodel->p31, b1));
 623                 fprintf(f, " p32 %s", sprint_percent(gimodel->p32, b1));
 624                 fprintf(f, " p23 %s", sprint_percent(gimodel->p23, b1));
 625                 fprintf(f, " p14 %s", sprint_percent(gimodel->p14, b1));
 626         }
 627
 628         if (gemodel) {
 629                 fprintf(f, " loss gemodel p %s",
 630                         sprint_percent(gemodel->p, b1));
 631                 fprintf(f, " r %s", sprint_percent(gemodel->r, b1));
 632                 fprintf(f, " 1-h %s", sprint_percent(max_percent_value -
 633                                                      gemodel->h, b1));
 634                 fprintf(f, " 1-k %s", sprint_percent(gemodel->k1, b1));
 635         }
 636
 637         if (qopt.duplicate) {
 638                 fprintf(f, " duplicate %s",
 639                         sprint_percent(qopt.duplicate, b1));
 640                 if (cor && cor->dup_corr)
 641                         fprintf(f, " %s", sprint_percent(cor->dup_corr, b1));
 642         }
 643
 644         if (reorder && reorder->probability) {
 645                 fprintf(f, " reorder %s",
 646                         sprint_percent(reorder->probability, b1));
 647                 if (reorder->correlation)
 648                         fprintf(f, " %s",
 649                                 sprint_percent(reorder->correlation, b1));
 650         }
 651
 652         if (corrupt && corrupt->probability) {
 653                 fprintf(f, " corrupt %s",
 654                         sprint_percent(corrupt->probability, b1));
 655                 if (corrupt->correlation)
 656                         fprintf(f, " %s",
 657                                 sprint_percent(corrupt->correlation, b1));
 658         }
 659
 660         if (rate && rate->rate) {
 661                 if (rate64)
 662                         fprintf(f, " rate %s", sprint_rate(rate64, b1));
 663                 else
 664                         fprintf(f, " rate %s", sprint_rate(rate->rate, b1));
 665                 if (rate->packet_overhead)
 666                         fprintf(f, " packetoverhead %d", rate->packet_overhead);
 667                 if (rate->cell_size)
 668                         fprintf(f, " cellsize %u", rate->cell_size);
 669                 if (rate->cell_overhead)
 670                         fprintf(f, " celloverhead %d", rate->cell_overhead);
 671         }
 672
 673         if (ecn)
 674                 fprintf(f, " ecn ");
 675
 676         if (qopt.gap)
 677                 fprintf(f, " gap %lu", (unsigned long)qopt.gap);
 678
 679
 680         return 0;
 681 }
 682
 683 struct qdisc_util netem_qdisc_util = {
 684         .id             = "netem",
 685         .parse_qopt     = netem_parse_opt,
 686         .print_qopt     = netem_print_opt,
 687 };