tc/m_action.c

   1 /*
   2  * m_action.c           Action Management
   3  *
   4  *              This program is free software; you can distribute 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:  J Hadi Salim (hadi@cyberus.ca)
  10  *
  11  * TODO:
  12  * - parse to be passed a filedescriptor for logging purposes
  13  *
  14 */
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <unistd.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 <dlfcn.h>
  25
  26 #include "utils.h"
  27 #include "tc_common.h"
  28 #include "tc_util.h"
  29
  30 static struct action_util *action_list;
  31 #ifdef CONFIG_GACT
  32 int gact_ld; /* f*ckin backward compatibility */
  33 #endif
  34 int tab_flush;
  35
  36 static void act_usage(void)
  37 {
  38         /*XXX: In the near future add a action->print_help to improve
  39          * usability
  40          * This would mean new tc will not be backward compatible
  41          * with any action .so from the old days. But if someone really
  42          * does that, they would know how to fix this ..
  43          *
  44         */
  45         fprintf(stderr, "usage: tc actions <ACTSPECOP>*\n");
  46         fprintf(stderr,
  47                 "Where: \tACTSPECOP := ACR | GD | FL\n"
  48                         "\tACR := add | change | replace <ACTSPEC>*\n"
  49                         "\tGD := get | delete | <ACTISPEC>*\n"
  50                         "\tFL := ls | list | flush | <ACTNAMESPEC>\n"
  51                         "\tACTNAMESPEC :=  action <ACTNAME>\n"
  52                         "\tACTISPEC := <ACTNAMESPEC> <INDEXSPEC>\n"
  53                         "\tACTSPEC := action <ACTDETAIL> [INDEXSPEC]\n"
  54                         "\tINDEXSPEC := index <32 bit indexvalue>\n"
  55                         "\tACTDETAIL := <ACTNAME> <ACTPARAMS>\n"
  56                         "\t\tExample ACTNAME is gact, mirred, bpf, etc\n"
  57                         "\t\tEach action has its own parameters (ACTPARAMS)\n"
  58                         "\n");
  59
  60         exit(-1);
  61 }
  62
  63 static int print_noaopt(struct action_util *au, FILE *f, struct rtattr *opt)
  64 {
  65         if (opt && RTA_PAYLOAD(opt))
  66                 fprintf(f, "[Unknown action, optlen=%u] ",
  67                         (unsigned int) RTA_PAYLOAD(opt));
  68         return 0;
  69 }
  70
  71 static int parse_noaopt(struct action_util *au, int *argc_p, char ***argv_p, int code, struct nlmsghdr *n)
  72 {
  73         int argc = *argc_p;
  74         char **argv = *argv_p;
  75
  76         if (argc) {
  77                 fprintf(stderr, "Unknown action \"%s\", hence option \"%s\" is unparsable\n", au->id, *argv);
  78         } else {
  79                 fprintf(stderr, "Unknown action \"%s\"\n", au->id);
  80         }
  81         return -1;
  82 }
  83
  84 static struct action_util *get_action_kind(char *str)
  85 {
  86         static void *aBODY;
  87         void *dlh;
  88         char buf[256];
  89         struct action_util *a;
  90 #ifdef CONFIG_GACT
  91         int looked4gact = 0;
  92 restart_s:
  93 #endif
  94         for (a = action_list; a; a = a->next) {
  95                 if (strcmp(a->id, str) == 0)
  96                         return a;
  97         }
  98
  99         snprintf(buf, sizeof(buf), "%s/m_%s.so", get_tc_lib(), str);
 100         dlh = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
 101         if (dlh == NULL) {
 102                 dlh = aBODY;
 103                 if (dlh == NULL) {
 104                         dlh = aBODY = dlopen(NULL, RTLD_LAZY);
 105                         if (dlh == NULL)
 106                                 goto noexist;
 107                 }
 108         }
 109
 110         snprintf(buf, sizeof(buf), "%s_action_util", str);
 111         a = dlsym(dlh, buf);
 112         if (a == NULL)
 113                 goto noexist;
 114
 115 reg:
 116         a->next = action_list;
 117         action_list = a;
 118         return a;
 119
 120 noexist:
 121 #ifdef CONFIG_GACT
 122         if (!looked4gact) {
 123                 looked4gact = 1;
 124                 strcpy(str, "gact");
 125                 goto restart_s;
 126         }
 127 #endif
 128         a = calloc(1, sizeof(*a));
 129         if (a) {
 130                 strncpy(a->id, "noact", 15);
 131                 a->parse_aopt = parse_noaopt;
 132                 a->print_aopt = print_noaopt;
 133                 goto reg;
 134         }
 135         return a;
 136 }
 137
 138 static int
 139 new_cmd(char **argv)
 140 {
 141         if ((matches(*argv, "change") == 0) ||
 142                 (matches(*argv, "replace") == 0) ||
 143                 (matches(*argv, "delete") == 0) ||
 144                 (matches(*argv, "get") == 0) ||
 145                 (matches(*argv, "add") == 0))
 146                         return 1;
 147
 148         return 0;
 149
 150 }
 151
 152 int parse_action(int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
 153 {
 154         int argc = *argc_p;
 155         char **argv = *argv_p;
 156         struct rtattr *tail, *tail2;
 157         char k[FILTER_NAMESZ];
 158         int act_ck_len = 0;
 159         int ok = 0;
 160         int eap = 0; /* expect action parameters */
 161
 162         int ret = 0;
 163         int prio = 0;
 164         unsigned char act_ck[TC_COOKIE_MAX_SIZE];
 165
 166         if (argc <= 0)
 167                 return -1;
 168
 169         tail = tail2 = NLMSG_TAIL(n);
 170
 171         addattr_l(n, MAX_MSG, tca_id, NULL, 0);
 172
 173         while (argc > 0) {
 174
 175                 memset(k, 0, sizeof(k));
 176
 177                 if (strcmp(*argv, "action") == 0) {
 178                         argc--;
 179                         argv++;
 180                         eap = 1;
 181 #ifdef CONFIG_GACT
 182                         if (!gact_ld) {
 183                                 get_action_kind("gact");
 184                         }
 185 #endif
 186                         continue;
 187                 } else if (strcmp(*argv, "flowid") == 0) {
 188                         break;
 189                 } else if (strcmp(*argv, "classid") == 0) {
 190                         break;
 191                 } else if (strcmp(*argv, "help") == 0) {
 192                         return -1;
 193                 } else if (new_cmd(argv)) {
 194                         goto done0;
 195                 } else {
 196                         struct action_util *a = NULL;
 197
 198                         strncpy(k, *argv, sizeof(k) - 1);
 199                         eap = 0;
 200                         if (argc > 0) {
 201                                 a = get_action_kind(k);
 202                         } else {
 203 done0:
 204                                 if (ok)
 205                                         break;
 206                                 else
 207                                         goto done;
 208                         }
 209
 210                         if (a == NULL) {
 211                                 goto bad_val;
 212                         }
 213
 214                         tail = NLMSG_TAIL(n);
 215                         addattr_l(n, MAX_MSG, ++prio, NULL, 0);
 216                         addattr_l(n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 217
 218                         ret = a->parse_aopt(a, &argc, &argv, TCA_ACT_OPTIONS,
 219                                             n);
 220
 221                         if (ret < 0) {
 222                                 fprintf(stderr, "bad action parsing\n");
 223                                 goto bad_val;
 224                         }
 225
 226                         if (*argv && strcmp(*argv, "cookie") == 0) {
 227                                 size_t slen;
 228
 229                                 NEXT_ARG();
 230                                 slen = strlen(*argv);
 231                                 if (slen > TC_COOKIE_MAX_SIZE * 2) {
 232                                         char cookie_err_m[128];
 233
 234                                         snprintf(cookie_err_m, 128,
 235                                                  "%zd Max allowed size %d",
 236                                                  slen, TC_COOKIE_MAX_SIZE*2);
 237                                         invarg(cookie_err_m, *argv);
 238                                 }
 239
 240                                 if (hex2mem(*argv, act_ck, slen / 2) < 0)
 241                                         invarg("cookie must be a hex string\n",
 242                                                *argv);
 243
 244                                 act_ck_len = slen / 2;
 245                                 argc--;
 246                                 argv++;
 247                         }
 248
 249                         if (act_ck_len)
 250                                 addattr_l(n, MAX_MSG, TCA_ACT_COOKIE,
 251                                           &act_ck, act_ck_len);
 252
 253                         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 254                         ok++;
 255                 }
 256         }
 257
 258         if (eap > 0) {
 259                 fprintf(stderr, "bad action empty %d\n", eap);
 260                 goto bad_val;
 261         }
 262
 263         tail2->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail2;
 264
 265 done:
 266         *argc_p = argc;
 267         *argv_p = argv;
 268         return 0;
 269 bad_val:
 270         /* no need to undo things, returning from here should
 271          * cause enough pain */
 272         fprintf(stderr, "parse_action: bad value (%d:%s)!\n", argc, *argv);
 273         return -1;
 274 }
 275
 276 static int tc_print_one_action(FILE *f, struct rtattr *arg)
 277 {
 278
 279         struct rtattr *tb[TCA_ACT_MAX + 1];
 280         int err = 0;
 281         struct action_util *a = NULL;
 282
 283         if (arg == NULL)
 284                 return -1;
 285
 286         parse_rtattr_nested(tb, TCA_ACT_MAX, arg);
 287
 288         if (tb[TCA_ACT_KIND] == NULL) {
 289                 fprintf(stderr, "NULL Action!\n");
 290                 return -1;
 291         }
 292
 293
 294         a = get_action_kind(RTA_DATA(tb[TCA_ACT_KIND]));
 295         if (a == NULL)
 296                 return err;
 297
 298         err = a->print_aopt(a, f, tb[TCA_ACT_OPTIONS]);
 299
 300         if (err < 0)
 301                 return err;
 302
 303         if (show_stats && tb[TCA_ACT_STATS]) {
 304                 print_string(PRINT_FP, NULL, "\tAction statistics:\n", NULL);
 305                 open_json_object("stats");
 306                 print_tcstats2_attr(f, tb[TCA_ACT_STATS], "\t", NULL);
 307                 close_json_object();
 308                 print_string(PRINT_FP, NULL, "\n", NULL);
 309         }
 310         if (tb[TCA_ACT_COOKIE]) {
 311                 int strsz = RTA_PAYLOAD(tb[TCA_ACT_COOKIE]);
 312                 char b1[strsz * 2 + 1];
 313
 314                 print_string(PRINT_ANY, "cookie", "\tcookie %s\n",
 315                              hexstring_n2a(RTA_DATA(tb[TCA_ACT_COOKIE]),
 316                                            strsz, b1, sizeof(b1)));
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int
 323 tc_print_action_flush(FILE *f, const struct rtattr *arg)
 324 {
 325
 326         struct rtattr *tb[TCA_MAX + 1];
 327         int err = 0;
 328         struct action_util *a = NULL;
 329         __u32 *delete_count = 0;
 330
 331         parse_rtattr_nested(tb, TCA_MAX, arg);
 332
 333         if (tb[TCA_KIND] == NULL) {
 334                 fprintf(stderr, "NULL Action!\n");
 335                 return -1;
 336         }
 337
 338         a = get_action_kind(RTA_DATA(tb[TCA_KIND]));
 339         if (a == NULL)
 340                 return err;
 341
 342         delete_count = RTA_DATA(tb[TCA_FCNT]);
 343         fprintf(f, " %s (%d entries)\n", a->id, *delete_count);
 344         tab_flush = 0;
 345         return 0;
 346 }
 347
 348 int
 349 tc_print_action(FILE *f, const struct rtattr *arg, unsigned short tot_acts)
 350 {
 351
 352         int i;
 353
 354         if (arg == NULL)
 355                 return 0;
 356
 357         if (!tot_acts)
 358                 tot_acts = TCA_ACT_MAX_PRIO;
 359
 360         struct rtattr *tb[tot_acts + 1];
 361
 362         parse_rtattr_nested(tb, tot_acts, arg);
 363
 364         if (tab_flush && NULL != tb[0]  && NULL == tb[1])
 365                 return tc_print_action_flush(f, tb[0]);
 366
 367         open_json_array(PRINT_JSON, "actions");
 368         for (i = 0; i < tot_acts; i++) {
 369                 if (tb[i]) {
 370                         open_json_object(NULL);
 371                         print_uint(PRINT_ANY, "order",
 372                                    "\n\taction order %u: ", i);
 373                         if (tc_print_one_action(f, tb[i]) < 0) {
 374                                 print_string(PRINT_FP, NULL,
 375                                              "Error printing action\n", NULL);
 376                         }
 377                         close_json_object();
 378                 }
 379
 380         }
 381         close_json_object();
 382
 383         return 0;
 384 }
 385
 386 int print_action(const struct sockaddr_nl *who,
 387                            struct nlmsghdr *n,
 388                            void *arg)
 389 {
 390         FILE *fp = (FILE *)arg;
 391         struct tcamsg *t = NLMSG_DATA(n);
 392         int len = n->nlmsg_len;
 393         __u32 *tot_acts = NULL;
 394         struct rtattr *tb[TCA_ROOT_MAX+1];
 395
 396         len -= NLMSG_LENGTH(sizeof(*t));
 397
 398         if (len < 0) {
 399                 fprintf(stderr, "Wrong len %d\n", len);
 400                 return -1;
 401         }
 402
 403         parse_rtattr(tb, TCA_ROOT_MAX, TA_RTA(t), len);
 404
 405         if (tb[TCA_ROOT_COUNT])
 406                 tot_acts = RTA_DATA(tb[TCA_ROOT_COUNT]);
 407
 408         fprintf(fp, "total acts %d\n", tot_acts ? *tot_acts:0);
 409         if (tb[TCA_ACT_TAB] == NULL) {
 410                 if (n->nlmsg_type != RTM_GETACTION)
 411                         fprintf(stderr, "print_action: NULL kind\n");
 412                 return -1;
 413         }
 414
 415         if (n->nlmsg_type == RTM_DELACTION) {
 416                 if (n->nlmsg_flags & NLM_F_ROOT) {
 417                         fprintf(fp, "Flushed table ");
 418                         tab_flush = 1;
 419                 } else {
 420                         fprintf(fp, "Deleted action ");
 421                 }
 422         }
 423
 424         if (n->nlmsg_type == RTM_NEWACTION) {
 425                 if ((n->nlmsg_flags & NLM_F_CREATE) &&
 426                     !(n->nlmsg_flags & NLM_F_REPLACE)) {
 427                         fprintf(fp, "Added action ");
 428                 } else if (n->nlmsg_flags & NLM_F_REPLACE) {
 429                         fprintf(fp, "Replaced action ");
 430                 }
 431         }
 432
 433
 434         tc_print_action(fp, tb[TCA_ACT_TAB], tot_acts ? *tot_acts:0);
 435
 436         return 0;
 437 }
 438
 439 static int tc_action_gd(int cmd, unsigned int flags, int *argc_p, char ***argv_p)
 440 {
 441         char k[FILTER_NAMESZ];
 442         struct action_util *a = NULL;
 443         int argc = *argc_p;
 444         char **argv = *argv_p;
 445         int prio = 0;
 446         int ret = 0;
 447         __u32 i = 0;
 448         struct rtattr *tail;
 449         struct rtattr *tail2;
 450         struct nlmsghdr *ans = NULL;
 451
 452         struct {
 453                 struct nlmsghdr         n;
 454                 struct tcamsg           t;
 455                 char                    buf[MAX_MSG];
 456         } req = {
 457                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
 458                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
 459                 .n.nlmsg_type = cmd,
 460                 .t.tca_family = AF_UNSPEC,
 461         };
 462
 463         argc -= 1;
 464         argv += 1;
 465
 466
 467         tail = NLMSG_TAIL(&req.n);
 468         addattr_l(&req.n, MAX_MSG, TCA_ACT_TAB, NULL, 0);
 469
 470         while (argc > 0) {
 471                 if (strcmp(*argv, "action") == 0) {
 472                         argc--;
 473                         argv++;
 474                         continue;
 475                 } else if (strcmp(*argv, "help") == 0) {
 476                         return -1;
 477                 }
 478
 479                 strncpy(k, *argv, sizeof(k) - 1);
 480                 a = get_action_kind(k);
 481                 if (a == NULL) {
 482                         fprintf(stderr, "Error: non existent action: %s\n", k);
 483                         ret = -1;
 484                         goto bad_val;
 485                 }
 486                 if (strcmp(a->id, k) != 0) {
 487                         fprintf(stderr, "Error: non existent action: %s\n", k);
 488                         ret = -1;
 489                         goto bad_val;
 490                 }
 491
 492                 argc -= 1;
 493                 argv += 1;
 494                 if (argc <= 0) {
 495                         fprintf(stderr, "Error: no index specified action: %s\n", k);
 496                         ret = -1;
 497                         goto bad_val;
 498                 }
 499
 500                 if (matches(*argv, "index") == 0) {
 501                         NEXT_ARG();
 502                         if (get_u32(&i, *argv, 10)) {
 503                                 fprintf(stderr, "Illegal \"index\"\n");
 504                                 ret = -1;
 505                                 goto bad_val;
 506                         }
 507                         argc -= 1;
 508                         argv += 1;
 509                 } else {
 510                         fprintf(stderr, "Error: no index specified action: %s\n", k);
 511                         ret = -1;
 512                         goto bad_val;
 513                 }
 514
 515                 tail2 = NLMSG_TAIL(&req.n);
 516                 addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
 517                 addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 518                 if (i > 0)
 519                         addattr32(&req.n, MAX_MSG, TCA_ACT_INDEX, i);
 520                 tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
 521
 522         }
 523
 524         tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
 525
 526         req.n.nlmsg_seq = rth.dump = ++rth.seq;
 527
 528         if (rtnl_talk(&rth, &req.n, &ans) < 0) {
 529                 fprintf(stderr, "We have an error talking to the kernel\n");
 530                 return 1;
 531         }
 532
 533         if (cmd == RTM_GETACTION && print_action(NULL, ans, stdout) < 0) {
 534                 fprintf(stderr, "Dump terminated\n");
 535                 free(ans);
 536                 return 1;
 537         }
 538         free(ans);
 539
 540         *argc_p = argc;
 541         *argv_p = argv;
 542 bad_val:
 543         return ret;
 544 }
 545
 546 static int tc_action_modify(int cmd, unsigned int flags, int *argc_p, char ***argv_p)
 547 {
 548         int argc = *argc_p;
 549         char **argv = *argv_p;
 550         int ret = 0;
 551         struct {
 552                 struct nlmsghdr         n;
 553                 struct tcamsg           t;
 554                 char                    buf[MAX_MSG];
 555         } req = {
 556                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
 557                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
 558                 .n.nlmsg_type = cmd,
 559                 .t.tca_family = AF_UNSPEC,
 560         };
 561         struct rtattr *tail = NLMSG_TAIL(&req.n);
 562
 563         argc -= 1;
 564         argv += 1;
 565         if (parse_action(&argc, &argv, TCA_ACT_TAB, &req.n)) {
 566                 fprintf(stderr, "Illegal \"action\"\n");
 567                 return -1;
 568         }
 569         tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
 570
 571         if (rtnl_talk(&rth, &req.n, NULL) < 0) {
 572                 fprintf(stderr, "We have an error talking to the kernel\n");
 573                 ret = -1;
 574         }
 575
 576         *argc_p = argc;
 577         *argv_p = argv;
 578
 579         return ret;
 580 }
 581
 582 static int tc_act_list_or_flush(int *argc_p, char ***argv_p, int event)
 583 {
 584         struct rtattr *tail, *tail2, *tail3, *tail4;
 585         int ret = 0, prio = 0, msg_size = 0;
 586         struct action_util *a = NULL;
 587         struct nla_bitfield32 flag_select = { 0 };
 588         char **argv = *argv_p;
 589         __u32 msec_since = 0;
 590         int argc = *argc_p;
 591         char k[FILTER_NAMESZ];
 592         struct {
 593                 struct nlmsghdr         n;
 594                 struct tcamsg           t;
 595                 char                    buf[MAX_MSG];
 596         } req = {
 597                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
 598                 .t.tca_family = AF_UNSPEC,
 599         };
 600
 601         tail = NLMSG_TAIL(&req.n);
 602         addattr_l(&req.n, MAX_MSG, TCA_ACT_TAB, NULL, 0);
 603         tail2 = NLMSG_TAIL(&req.n);
 604
 605         strncpy(k, *argv, sizeof(k) - 1);
 606 #ifdef CONFIG_GACT
 607         if (!gact_ld) {
 608                 get_action_kind("gact");
 609         }
 610 #endif
 611         a = get_action_kind(k);
 612         if (a == NULL) {
 613                 fprintf(stderr, "bad action %s\n", k);
 614                 goto bad_val;
 615         }
 616         if (strcmp(a->id, k) != 0) {
 617                 fprintf(stderr, "bad action %s\n", k);
 618                 goto bad_val;
 619         }
 620         strncpy(k, *argv, sizeof(k) - 1);
 621
 622         argc -= 1;
 623         argv += 1;
 624
 625         if (argc && (strcmp(*argv, "since") == 0)) {
 626                 NEXT_ARG();
 627                 if (get_u32(&msec_since, *argv, 0))
 628                         invarg("dump time \"since\" is invalid", *argv);
 629         }
 630
 631         addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
 632         addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 633         tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
 634         tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
 635
 636         tail3 = NLMSG_TAIL(&req.n);
 637         flag_select.value |= TCA_FLAG_LARGE_DUMP_ON;
 638         flag_select.selector |= TCA_FLAG_LARGE_DUMP_ON;
 639         addattr_l(&req.n, MAX_MSG, TCA_ROOT_FLAGS, &flag_select,
 640                   sizeof(struct nla_bitfield32));
 641         tail3->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail3;
 642         if (msec_since) {
 643                 tail4 = NLMSG_TAIL(&req.n);
 644                 addattr32(&req.n, MAX_MSG, TCA_ROOT_TIME_DELTA, msec_since);
 645                 tail4->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail4;
 646         }
 647         msg_size = NLMSG_ALIGN(req.n.nlmsg_len) - NLMSG_ALIGN(sizeof(struct nlmsghdr));
 648
 649         if (event == RTM_GETACTION) {
 650                 if (rtnl_dump_request(&rth, event, (void *)&req.t, msg_size) < 0) {
 651                         perror("Cannot send dump request");
 652                         return 1;
 653                 }
 654                 ret = rtnl_dump_filter(&rth, print_action, stdout);
 655         }
 656
 657         if (event == RTM_DELACTION) {
 658                 req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len);
 659                 req.n.nlmsg_type = RTM_DELACTION;
 660                 req.n.nlmsg_flags |= NLM_F_ROOT;
 661                 req.n.nlmsg_flags |= NLM_F_REQUEST;
 662                 if (rtnl_talk(&rth, &req.n, NULL) < 0) {
 663                         fprintf(stderr, "We have an error flushing\n");
 664                         return 1;
 665                 }
 666
 667         }
 668
 669 bad_val:
 670
 671         *argc_p = argc;
 672         *argv_p = argv;
 673         return ret;
 674 }
 675
 676 int do_action(int argc, char **argv)
 677 {
 678
 679         int ret = 0;
 680
 681         while (argc > 0) {
 682
 683                 if (matches(*argv, "add") == 0) {
 684                         ret =  tc_action_modify(RTM_NEWACTION, NLM_F_EXCL|NLM_F_CREATE, &argc, &argv);
 685                 } else if (matches(*argv, "change") == 0 ||
 686                           matches(*argv, "replace") == 0) {
 687                         ret = tc_action_modify(RTM_NEWACTION, NLM_F_CREATE|NLM_F_REPLACE, &argc, &argv);
 688                 } else if (matches(*argv, "delete") == 0) {
 689                         argc -= 1;
 690                         argv += 1;
 691                         ret = tc_action_gd(RTM_DELACTION, 0,  &argc, &argv);
 692                 } else if (matches(*argv, "get") == 0) {
 693                         argc -= 1;
 694                         argv += 1;
 695                         ret = tc_action_gd(RTM_GETACTION, 0,  &argc, &argv);
 696                 } else if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 697                                                 || matches(*argv, "lst") == 0) {
 698                         if (argc <= 2) {
 699                                 act_usage();
 700                                 return -1;
 701                         }
 702
 703                         argc -= 2;
 704                         argv += 2;
 705                         return tc_act_list_or_flush(&argc, &argv,
 706                                                     RTM_GETACTION);
 707                 } else if (matches(*argv, "flush") == 0) {
 708                         if (argc <= 2) {
 709                                 act_usage();
 710                                 return -1;
 711                         }
 712
 713                         argc -= 2;
 714                         argv += 2;
 715                         return tc_act_list_or_flush(&argc, &argv,
 716                                                     RTM_DELACTION);
 717                 } else if (matches(*argv, "help") == 0) {
 718                         act_usage();
 719                         return -1;
 720                 } else {
 721                         fprintf(stderr, "Command \"%s\" is unknown, try \"tc actions help\".\n", *argv);
 722                         return -1;
 723                 }
 724
 725                 if (ret < 0)
 726                         return -1;
 727         }
 728
 729         return 0;
 730 }