tc/tc_util.c

   1 /*
   2  * tc_util.c            Misc TC utility functions.
   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:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <sys/param.h>
  20 #include <netinet/in.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23 #include <math.h>
  24 #include <errno.h>
  25
  26 #include "utils.h"
  27 #include "names.h"
  28 #include "tc_util.h"
  29 #include "tc_common.h"
  30
  31 #ifndef LIBDIR
  32 #define LIBDIR "/usr/lib"
  33 #endif
  34
  35 static struct db_names *cls_names = NULL;
  36
  37 #define NAMES_DB "/etc/iproute2/tc_cls"
  38
  39 int cls_names_init(char *path)
  40 {
  41         int ret;
  42
  43         cls_names = db_names_alloc();
  44         if (!cls_names)
  45                 return -1;
  46
  47         ret = db_names_load(cls_names, path ?: NAMES_DB);
  48         if (ret == -ENOENT && path) {
  49                 fprintf(stderr, "Can't open class names file: %s\n", path);
  50                 return -1;
  51         }
  52         if (ret) {
  53                 db_names_free(cls_names);
  54                 cls_names = NULL;
  55         }
  56
  57         return 0;
  58 }
  59
  60 void cls_names_uninit(void)
  61 {
  62         db_names_free(cls_names);
  63 }
  64
  65 const char *get_tc_lib(void)
  66 {
  67         const char *lib_dir;
  68
  69         lib_dir = getenv("TC_LIB_DIR");
  70         if (!lib_dir)
  71                 lib_dir = LIBDIR "/tc/";
  72
  73         return lib_dir;
  74 }
  75
  76 int get_qdisc_handle(__u32 *h, const char *str)
  77 {
  78         __u32 maj;
  79         char *p;
  80
  81         maj = TC_H_UNSPEC;
  82         if (strcmp(str, "none") == 0)
  83                 goto ok;
  84         maj = strtoul(str, &p, 16);
  85         if (p == str)
  86                 return -1;
  87         maj <<= 16;
  88         if (*p != ':' && *p!=0)
  89                 return -1;
  90 ok:
  91         *h = maj;
  92         return 0;
  93 }
  94
  95 int get_tc_classid(__u32 *h, const char *str)
  96 {
  97         __u32 maj, min;
  98         char *p;
  99
 100         maj = TC_H_ROOT;
 101         if (strcmp(str, "root") == 0)
 102                 goto ok;
 103         maj = TC_H_UNSPEC;
 104         if (strcmp(str, "none") == 0)
 105                 goto ok;
 106         maj = strtoul(str, &p, 16);
 107         if (p == str) {
 108                 maj = 0;
 109                 if (*p != ':')
 110                         return -1;
 111         }
 112         if (*p == ':') {
 113                 if (maj >= (1<<16))
 114                         return -1;
 115                 maj <<= 16;
 116                 str = p+1;
 117                 min = strtoul(str, &p, 16);
 118                 if (*p != 0)
 119                         return -1;
 120                 if (min >= (1<<16))
 121                         return -1;
 122                 maj |= min;
 123         } else if (*p != 0)
 124                 return -1;
 125
 126 ok:
 127         *h = maj;
 128         return 0;
 129 }
 130
 131 int print_tc_classid(char *buf, int blen, __u32 h)
 132 {
 133         SPRINT_BUF(handle) = {};
 134         int hlen = SPRINT_BSIZE - 1;
 135
 136         if (h == TC_H_ROOT)
 137                 sprintf(handle, "root");
 138         else if (h == TC_H_UNSPEC)
 139                 snprintf(handle, hlen, "none");
 140         else if (TC_H_MAJ(h) == 0)
 141                 snprintf(handle, hlen, ":%x", TC_H_MIN(h));
 142         else if (TC_H_MIN(h) == 0)
 143                 snprintf(handle, hlen, "%x:", TC_H_MAJ(h) >> 16);
 144         else
 145                 snprintf(handle, hlen, "%x:%x", TC_H_MAJ(h) >> 16, TC_H_MIN(h));
 146
 147         if (use_names) {
 148                 char clname[IDNAME_MAX] = {};
 149
 150                 if (id_to_name(cls_names, h, clname))
 151                         snprintf(buf, blen, "%s#%s", clname, handle);
 152                 else
 153                         snprintf(buf, blen, "%s", handle);
 154         } else {
 155                 snprintf(buf, blen, "%s", handle);
 156         }
 157
 158         return 0;
 159 }
 160
 161 char *sprint_tc_classid(__u32 h, char *buf)
 162 {
 163         if (print_tc_classid(buf, SPRINT_BSIZE-1, h))
 164                 strcpy(buf, "???");
 165         return buf;
 166 }
 167
 168 /* See http://physics.nist.gov/cuu/Units/binary.html */
 169 static const struct rate_suffix {
 170         const char *name;
 171         double scale;
 172 } suffixes[] = {
 173         { "bit",        1. },
 174         { "Kibit",      1024. },
 175         { "kbit",       1000. },
 176         { "mibit",      1024.*1024. },
 177         { "mbit",       1000000. },
 178         { "gibit",      1024.*1024.*1024. },
 179         { "gbit",       1000000000. },
 180         { "tibit",      1024.*1024.*1024.*1024. },
 181         { "tbit",       1000000000000. },
 182         { "Bps",        8. },
 183         { "KiBps",      8.*1024. },
 184         { "KBps",       8000. },
 185         { "MiBps",      8.*1024*1024. },
 186         { "MBps",       8000000. },
 187         { "GiBps",      8.*1024.*1024.*1024. },
 188         { "GBps",       8000000000. },
 189         { "TiBps",      8.*1024.*1024.*1024.*1024. },
 190         { "TBps",       8000000000000. },
 191         { NULL }
 192 };
 193
 194
 195 int get_rate(unsigned *rate, const char *str)
 196 {
 197         char *p;
 198         double bps = strtod(str, &p);
 199         const struct rate_suffix *s;
 200
 201         if (p == str)
 202                 return -1;
 203
 204         for (s = suffixes; s->name; ++s) {
 205                 if (strcasecmp(s->name, p) == 0) {
 206                         bps *= s->scale;
 207                         p += strlen(p);
 208                         break;
 209                 }
 210         }
 211
 212         if (*p)
 213                 return -1; /* unknown suffix */
 214
 215         bps /= 8; /* -> bytes per second */
 216         *rate = bps;
 217         /* detect if an overflow happened */
 218         if (*rate != floor(bps))
 219                 return -1;
 220         return 0;
 221 }
 222
 223 int get_rate64(__u64 *rate, const char *str)
 224 {
 225         char *p;
 226         double bps = strtod(str, &p);
 227         const struct rate_suffix *s;
 228
 229         if (p == str)
 230                 return -1;
 231
 232         for (s = suffixes; s->name; ++s) {
 233                 if (strcasecmp(s->name, p) == 0) {
 234                         bps *= s->scale;
 235                         p += strlen(p);
 236                         break;
 237                 }
 238         }
 239
 240         if (*p)
 241                 return -1; /* unknown suffix */
 242
 243         bps /= 8; /* -> bytes per second */
 244         *rate = bps;
 245         return 0;
 246 }
 247
 248 void print_rate(char *buf, int len, __u64 rate)
 249 {
 250         extern int use_iec;
 251         unsigned long kilo = use_iec ? 1024 : 1000;
 252         const char *str = use_iec ? "i" : "";
 253         int i = 0;
 254         static char *units[5] = {"", "K", "M", "G", "T"};
 255
 256         rate <<= 3; /* bytes/sec -> bits/sec */
 257
 258         for (i = 0; i < ARRAY_SIZE(units); i++)  {
 259                 if (rate < kilo)
 260                         break;
 261                 if (((rate % kilo) != 0) && rate < 1000*kilo)
 262                         break;
 263                 rate /= kilo;
 264         }
 265         snprintf(buf, len, "%.0f%s%sbit", (double)rate, units[i], str);
 266 }
 267
 268 char * sprint_rate(__u64 rate, char *buf)
 269 {
 270         print_rate(buf, SPRINT_BSIZE-1, rate);
 271         return buf;
 272 }
 273
 274 int get_time(unsigned *time, const char *str)
 275 {
 276         double t;
 277         char *p;
 278
 279         t = strtod(str, &p);
 280         if (p == str)
 281                 return -1;
 282
 283         if (*p) {
 284                 if (strcasecmp(p, "s") == 0 || strcasecmp(p, "sec")==0 ||
 285                     strcasecmp(p, "secs")==0)
 286                         t *= TIME_UNITS_PER_SEC;
 287                 else if (strcasecmp(p, "ms") == 0 || strcasecmp(p, "msec")==0 ||
 288                          strcasecmp(p, "msecs") == 0)
 289                         t *= TIME_UNITS_PER_SEC/1000;
 290                 else if (strcasecmp(p, "us") == 0 || strcasecmp(p, "usec")==0 ||
 291                          strcasecmp(p, "usecs") == 0)
 292                         t *= TIME_UNITS_PER_SEC/1000000;
 293                 else
 294                         return -1;
 295         }
 296
 297         *time = t;
 298         return 0;
 299 }
 300
 301
 302 void print_time(char *buf, int len, __u32 time)
 303 {
 304         double tmp = time;
 305
 306         if (tmp >= TIME_UNITS_PER_SEC)
 307                 snprintf(buf, len, "%.1fs", tmp/TIME_UNITS_PER_SEC);
 308         else if (tmp >= TIME_UNITS_PER_SEC/1000)
 309                 snprintf(buf, len, "%.1fms", tmp/(TIME_UNITS_PER_SEC/1000));
 310         else
 311                 snprintf(buf, len, "%uus", time);
 312 }
 313
 314 char * sprint_time(__u32 time, char *buf)
 315 {
 316         print_time(buf, SPRINT_BSIZE-1, time);
 317         return buf;
 318 }
 319
 320 char * sprint_ticks(__u32 ticks, char *buf)
 321 {
 322         return sprint_time(tc_core_tick2time(ticks), buf);
 323 }
 324
 325 int get_size(unsigned *size, const char *str)
 326 {
 327         double sz;
 328         char *p;
 329
 330         sz = strtod(str, &p);
 331         if (p == str)
 332                 return -1;
 333
 334         if (*p) {
 335                 if (strcasecmp(p, "kb") == 0 || strcasecmp(p, "k")==0)
 336                         sz *= 1024;
 337                 else if (strcasecmp(p, "gb") == 0 || strcasecmp(p, "g")==0)
 338                         sz *= 1024*1024*1024;
 339                 else if (strcasecmp(p, "gbit") == 0)
 340                         sz *= 1024*1024*1024/8;
 341                 else if (strcasecmp(p, "mb") == 0 || strcasecmp(p, "m")==0)
 342                         sz *= 1024*1024;
 343                 else if (strcasecmp(p, "mbit") == 0)
 344                         sz *= 1024*1024/8;
 345                 else if (strcasecmp(p, "kbit") == 0)
 346                         sz *= 1024/8;
 347                 else if (strcasecmp(p, "b") != 0)
 348                         return -1;
 349         }
 350
 351         *size = sz;
 352         return 0;
 353 }
 354
 355 int get_size_and_cell(unsigned *size, int *cell_log, char *str)
 356 {
 357         char * slash = strchr(str, '/');
 358
 359         if (slash)
 360                 *slash = 0;
 361
 362         if (get_size(size, str))
 363                 return -1;
 364
 365         if (slash) {
 366                 int cell;
 367                 int i;
 368
 369                 if (get_integer(&cell, slash+1, 0))
 370                         return -1;
 371                 *slash = '/';
 372
 373                 for (i=0; i<32; i++) {
 374                         if ((1<<i) == cell) {
 375                                 *cell_log = i;
 376                                 return 0;
 377                         }
 378                 }
 379                 return -1;
 380         }
 381         return 0;
 382 }
 383
 384 void print_size(char *buf, int len, __u32 sz)
 385 {
 386         double tmp = sz;
 387
 388         if (sz >= 1024*1024 && fabs(1024*1024*rint(tmp/(1024*1024)) - sz) < 1024)
 389                 snprintf(buf, len, "%gMb", rint(tmp/(1024*1024)));
 390         else if (sz >= 1024 && fabs(1024*rint(tmp/1024) - sz) < 16)
 391                 snprintf(buf, len, "%gKb", rint(tmp/1024));
 392         else
 393                 snprintf(buf, len, "%ub", sz);
 394 }
 395
 396 char * sprint_size(__u32 size, char *buf)
 397 {
 398         print_size(buf, SPRINT_BSIZE-1, size);
 399         return buf;
 400 }
 401
 402 void print_qdisc_handle(char *buf, int len, __u32 h)
 403 {
 404         snprintf(buf, len, "%x:", TC_H_MAJ(h)>>16);
 405 }
 406
 407 char * sprint_qdisc_handle(__u32 h, char *buf)
 408 {
 409         print_qdisc_handle(buf, SPRINT_BSIZE-1, h);
 410         return buf;
 411 }
 412
 413 char * action_n2a(int action, char *buf, int len)
 414 {
 415         switch (action) {
 416         case -1:
 417                 return "continue";
 418                 break;
 419         case TC_ACT_OK:
 420                 return "pass";
 421                 break;
 422         case TC_ACT_SHOT:
 423                 return "drop";
 424                 break;
 425         case TC_ACT_RECLASSIFY:
 426                 return "reclassify";
 427         case TC_ACT_PIPE:
 428                 return "pipe";
 429         case TC_ACT_STOLEN:
 430                 return "stolen";
 431         default:
 432                 snprintf(buf, len, "%d", action);
 433                 return buf;
 434         }
 435 }
 436
 437 int action_a2n(char *arg, int *result)
 438 {
 439         int res;
 440
 441         if (matches(arg, "continue") == 0)
 442                 res = -1;
 443         else if (matches(arg, "drop") == 0)
 444                 res = TC_ACT_SHOT;
 445         else if (matches(arg, "shot") == 0)
 446                 res = TC_ACT_SHOT;
 447         else if (matches(arg, "pass") == 0)
 448                 res = TC_ACT_OK;
 449         else if (strcmp(arg, "ok") == 0)
 450                 res = TC_ACT_OK;
 451         else if (matches(arg, "reclassify") == 0)
 452                 res = TC_ACT_RECLASSIFY;
 453         else {
 454                 char dummy;
 455                 if (sscanf(arg, "%d%c", &res, &dummy) != 1)
 456                         return -1;
 457         }
 458         *result = res;
 459         return 0;
 460 }
 461
 462 int get_linklayer(unsigned *val, const char *arg)
 463 {
 464         int res;
 465
 466         if (matches(arg, "ethernet") == 0)
 467                 res = LINKLAYER_ETHERNET;
 468         else if (matches(arg, "atm") == 0)
 469                 res = LINKLAYER_ATM;
 470         else if (matches(arg, "adsl") == 0)
 471                 res = LINKLAYER_ATM;
 472         else
 473                 return -1; /* Indicate error */
 474
 475         *val = res;
 476         return 0;
 477 }
 478
 479 void print_linklayer(char *buf, int len, unsigned linklayer)
 480 {
 481         switch (linklayer) {
 482         case LINKLAYER_UNSPEC:
 483                 snprintf(buf, len, "%s", "unspec");
 484                 return;
 485         case LINKLAYER_ETHERNET:
 486                 snprintf(buf, len, "%s", "ethernet");
 487                 return;
 488         case LINKLAYER_ATM:
 489                 snprintf(buf, len, "%s", "atm");
 490                 return;
 491         default:
 492                 snprintf(buf, len, "%s", "unknown");
 493                 return;
 494         }
 495 }
 496
 497 char *sprint_linklayer(unsigned linklayer, char *buf)
 498 {
 499         print_linklayer(buf, SPRINT_BSIZE-1, linklayer);
 500         return buf;
 501 }
 502
 503 void print_tm(FILE * f, const struct tcf_t *tm)
 504 {
 505         int hz = get_user_hz();
 506         if (tm->install != 0)
 507                 fprintf(f, " installed %u sec", (unsigned)(tm->install/hz));
 508         if (tm->lastuse != 0)
 509                 fprintf(f, " used %u sec", (unsigned)(tm->lastuse/hz));
 510         if (tm->expires != 0)
 511                 fprintf(f, " expires %u sec", (unsigned)(tm->expires/hz));
 512 }
 513
 514 void print_tcstats2_attr(FILE *fp, struct rtattr *rta, char *prefix, struct rtattr **xstats)
 515 {
 516         SPRINT_BUF(b1);
 517         struct rtattr *tbs[TCA_STATS_MAX + 1];
 518
 519         parse_rtattr_nested(tbs, TCA_STATS_MAX, rta);
 520
 521         if (tbs[TCA_STATS_BASIC]) {
 522                 struct gnet_stats_basic bs = {0};
 523                 memcpy(&bs, RTA_DATA(tbs[TCA_STATS_BASIC]), MIN(RTA_PAYLOAD(tbs[TCA_STATS_BASIC]), sizeof(bs)));
 524                 fprintf(fp, "%sSent %llu bytes %u pkt",
 525                         prefix, (unsigned long long) bs.bytes, bs.packets);
 526         }
 527
 528         if (tbs[TCA_STATS_QUEUE]) {
 529                 struct gnet_stats_queue q = {0};
 530                 memcpy(&q, RTA_DATA(tbs[TCA_STATS_QUEUE]), MIN(RTA_PAYLOAD(tbs[TCA_STATS_QUEUE]), sizeof(q)));
 531                 fprintf(fp, " (dropped %u, overlimits %u requeues %u) ",
 532                         q.drops, q.overlimits, q.requeues);
 533         }
 534
 535         if (tbs[TCA_STATS_RATE_EST64]) {
 536                 struct gnet_stats_rate_est64 re = {0};
 537
 538                 memcpy(&re, RTA_DATA(tbs[TCA_STATS_RATE_EST64]),
 539                        MIN(RTA_PAYLOAD(tbs[TCA_STATS_RATE_EST64]),
 540                            sizeof(re)));
 541                 fprintf(fp, "\n%srate %s %llupps ",
 542                         prefix, sprint_rate(re.bps, b1), re.pps);
 543         } else if (tbs[TCA_STATS_RATE_EST]) {
 544                 struct gnet_stats_rate_est re = {0};
 545
 546                 memcpy(&re, RTA_DATA(tbs[TCA_STATS_RATE_EST]),
 547                        MIN(RTA_PAYLOAD(tbs[TCA_STATS_RATE_EST]), sizeof(re)));
 548                 fprintf(fp, "\n%srate %s %upps ",
 549                         prefix, sprint_rate(re.bps, b1), re.pps);
 550         }
 551
 552         if (tbs[TCA_STATS_QUEUE]) {
 553                 struct gnet_stats_queue q = {0};
 554                 memcpy(&q, RTA_DATA(tbs[TCA_STATS_QUEUE]), MIN(RTA_PAYLOAD(tbs[TCA_STATS_QUEUE]), sizeof(q)));
 555                 if (!tbs[TCA_STATS_RATE_EST])
 556                         fprintf(fp, "\n%s", prefix);
 557                 fprintf(fp, "backlog %s %up requeues %u ",
 558                         sprint_size(q.backlog, b1), q.qlen, q.requeues);
 559         }
 560
 561         if (xstats)
 562                 *xstats = tbs[TCA_STATS_APP] ? : NULL;
 563 }
 564
 565 void print_tcstats_attr(FILE *fp, struct rtattr *tb[], char *prefix, struct rtattr **xstats)
 566 {
 567         SPRINT_BUF(b1);
 568
 569         if (tb[TCA_STATS2]) {
 570                 print_tcstats2_attr(fp, tb[TCA_STATS2], prefix, xstats);
 571                 if (xstats && NULL == *xstats)
 572                         goto compat_xstats;
 573                 return;
 574         }
 575         /* backward compatibility */
 576         if (tb[TCA_STATS]) {
 577                 struct tc_stats st;
 578
 579                 /* handle case where kernel returns more/less than we know about */
 580                 memset(&st, 0, sizeof(st));
 581                 memcpy(&st, RTA_DATA(tb[TCA_STATS]), MIN(RTA_PAYLOAD(tb[TCA_STATS]), sizeof(st)));
 582
 583                 fprintf(fp, "%sSent %llu bytes %u pkts (dropped %u, overlimits %u) ",
 584                         prefix, (unsigned long long)st.bytes, st.packets, st.drops,
 585                         st.overlimits);
 586
 587                 if (st.bps || st.pps || st.qlen || st.backlog) {
 588                         fprintf(fp, "\n%s", prefix);
 589                         if (st.bps || st.pps) {
 590                                 fprintf(fp, "rate ");
 591                                 if (st.bps)
 592                                         fprintf(fp, "%s ", sprint_rate(st.bps, b1));
 593                                 if (st.pps)
 594                                         fprintf(fp, "%upps ", st.pps);
 595                         }
 596                         if (st.qlen || st.backlog) {
 597                                 fprintf(fp, "backlog ");
 598                                 if (st.backlog)
 599                                         fprintf(fp, "%s ", sprint_size(st.backlog, b1));
 600                                 if (st.qlen)
 601                                         fprintf(fp, "%up ", st.qlen);
 602                         }
 603                 }
 604         }
 605
 606 compat_xstats:
 607         if (tb[TCA_XSTATS] && xstats)
 608                 *xstats = tb[TCA_XSTATS];
 609 }
 610