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 <stdbool.h>
  19 #include <unistd.h>
  20 #include <fcntl.h>
  21 #include <sys/socket.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include <string.h>
  25 #include <dlfcn.h>
  26
  27 #include "utils.h"
  28 #include "tc_common.h"
  29 #include "tc_util.h"
  30
  31 static struct action_util *action_list;
  32 #ifdef CONFIG_GACT
  33 static int gact_ld; /* f*ckin backward compatibility */
  34 #endif
  35 static int tab_flush;
  36
  37 static void act_usage(void)
  38 {
  39         /*XXX: In the near future add a action->print_help to improve
  40          * usability
  41          * This would mean new tc will not be backward compatible
  42          * with any action .so from the old days. But if someone really
  43          * does that, they would know how to fix this ..
  44          *
  45          */
  46         fprintf(stderr,
  47                 "usage: tc actions <ACTSPECOP>*\n"
  48                 "Where:         ACTSPECOP := ACR | GD | FL\n"
  49                 "       ACR := add | change | replace <ACTSPEC>*\n"
  50                 "       GD := get | delete | <ACTISPEC>*\n"
  51                 "       FL := ls | list | flush | <ACTNAMESPEC>\n"
  52                 "       ACTNAMESPEC :=  action <ACTNAME>\n"
  53                 "       ACTISPEC := <ACTNAMESPEC> <INDEXSPEC>\n"
  54                 "       ACTSPEC := action <ACTDETAIL> [INDEXSPEC]\n"
  55                 "       INDEXSPEC := index <32 bit indexvalue>\n"
  56                 "       ACTDETAIL := <ACTNAME> <ACTPARAMS>\n"
  57                 "               Example ACTNAME is gact, mirred, bpf, etc\n"
  58                 "               Each action has its own parameters (ACTPARAMS)\n"
  59                 "\n");
  60
  61         exit(-1);
  62 }
  63
  64 static int print_noaopt(struct action_util *au, FILE *f, struct rtattr *opt)
  65 {
  66         if (opt && RTA_PAYLOAD(opt))
  67                 fprintf(f, "[Unknown action, optlen=%u] ",
  68                         (unsigned int) RTA_PAYLOAD(opt));
  69         return 0;
  70 }
  71
  72 static int parse_noaopt(struct action_util *au, int *argc_p,
  73                         char ***argv_p, int code, struct nlmsghdr *n)
  74 {
  75         int argc = *argc_p;
  76         char **argv = *argv_p;
  77
  78         if (argc)
  79                 fprintf(stderr,
  80                         "Unknown action \"%s\", hence option \"%s\" is unparsable\n",
  81                         au->id, *argv);
  82         else
  83                 fprintf(stderr, "Unknown action \"%s\"\n", au->id);
  84
  85         return -1;
  86 }
  87
  88 static struct action_util *get_action_kind(char *str)
  89 {
  90         static void *aBODY;
  91         void *dlh;
  92         char buf[256];
  93         struct action_util *a;
  94 #ifdef CONFIG_GACT
  95         int looked4gact = 0;
  96 restart_s:
  97 #endif
  98         for (a = action_list; a; a = a->next) {
  99                 if (strcmp(a->id, str) == 0)
 100                         return a;
 101         }
 102
 103         snprintf(buf, sizeof(buf), "%s/m_%s.so", get_tc_lib(), str);
 104         dlh = dlopen(buf, RTLD_LAZY | RTLD_GLOBAL);
 105         if (dlh == NULL) {
 106                 dlh = aBODY;
 107                 if (dlh == NULL) {
 108                         dlh = aBODY = dlopen(NULL, RTLD_LAZY);
 109                         if (dlh == NULL)
 110                                 goto noexist;
 111                 }
 112         }
 113
 114         snprintf(buf, sizeof(buf), "%s_action_util", str);
 115         a = dlsym(dlh, buf);
 116         if (a == NULL)
 117                 goto noexist;
 118
 119 reg:
 120         a->next = action_list;
 121         action_list = a;
 122         return a;
 123
 124 noexist:
 125 #ifdef CONFIG_GACT
 126         if (!looked4gact) {
 127                 looked4gact = 1;
 128                 strcpy(str, "gact");
 129                 goto restart_s;
 130         }
 131 #endif
 132         a = calloc(1, sizeof(*a));
 133         if (a) {
 134                 strncpy(a->id, "noact", 15);
 135                 a->parse_aopt = parse_noaopt;
 136                 a->print_aopt = print_noaopt;
 137                 goto reg;
 138         }
 139         return a;
 140 }
 141
 142 static bool
 143 new_cmd(char **argv)
 144 {
 145         return (matches(*argv, "change") == 0) ||
 146                 (matches(*argv, "replace") == 0) ||
 147                 (matches(*argv, "delete") == 0) ||
 148                 (matches(*argv, "get") == 0) ||
 149                 (matches(*argv, "add") == 0);
 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         tail2 = addattr_nest(n, MAX_MSG, tca_id);
 170
 171         while (argc > 0) {
 172
 173                 memset(k, 0, sizeof(k));
 174
 175                 if (strcmp(*argv, "action") == 0) {
 176                         argc--;
 177                         argv++;
 178                         eap = 1;
 179 #ifdef CONFIG_GACT
 180                         if (!gact_ld)
 181                                 get_action_kind("gact");
 182 #endif
 183                         continue;
 184                 } else if (strcmp(*argv, "flowid") == 0) {
 185                         break;
 186                 } else if (strcmp(*argv, "classid") == 0) {
 187                         break;
 188                 } else if (strcmp(*argv, "help") == 0) {
 189                         return -1;
 190                 } else if (new_cmd(argv)) {
 191                         goto done0;
 192                 } else {
 193                         struct action_util *a = NULL;
 194
 195                         if (!action_a2n(*argv, NULL, false))
 196                                 strncpy(k, "gact", sizeof(k) - 1);
 197                         else
 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 = addattr_nest(n, MAX_MSG, ++prio);
 215                         addattr_l(n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 216
 217                         ret = a->parse_aopt(a, &argc, &argv,
 218                                             TCA_ACT_OPTIONS | NLA_F_NESTED,
 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                         addattr_nest_end(n, 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         addattr_nest_end(n, 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          */
 273         fprintf(stderr, "parse_action: bad value (%d:%s)!\n", argc, *argv);
 274         return -1;
 275 }
 276
 277 static int tc_print_one_action(FILE *f, struct rtattr *arg)
 278 {
 279
 280         struct rtattr *tb[TCA_ACT_MAX + 1];
 281         int err = 0;
 282         struct action_util *a = NULL;
 283
 284         if (arg == NULL)
 285                 return -1;
 286
 287         parse_rtattr_nested(tb, TCA_ACT_MAX, arg);
 288
 289         if (tb[TCA_ACT_KIND] == NULL) {
 290                 fprintf(stderr, "NULL Action!\n");
 291                 return -1;
 292         }
 293
 294
 295         a = get_action_kind(RTA_DATA(tb[TCA_ACT_KIND]));
 296         if (a == NULL)
 297                 return err;
 298
 299         err = a->print_aopt(a, f, tb[TCA_ACT_OPTIONS]);
 300
 301         if (err < 0)
 302                 return err;
 303
 304         if (show_stats && tb[TCA_ACT_STATS]) {
 305                 print_string(PRINT_FP, NULL, "\tAction statistics:", NULL);
 306                 print_string(PRINT_FP, NULL, "%s", _SL_);
 307                 open_json_object("stats");
 308                 print_tcstats2_attr(f, tb[TCA_ACT_STATS], "\t", NULL);
 309                 close_json_object();
 310                 print_string(PRINT_FP, NULL, "%s", _SL_);
 311         }
 312         if (tb[TCA_ACT_COOKIE]) {
 313                 int strsz = RTA_PAYLOAD(tb[TCA_ACT_COOKIE]);
 314                 char b1[strsz * 2 + 1];
 315
 316                 print_string(PRINT_ANY, "cookie", "\tcookie %s",
 317                              hexstring_n2a(RTA_DATA(tb[TCA_ACT_COOKIE]),
 318                                            strsz, b1, sizeof(b1)));
 319                 print_string(PRINT_FP, NULL, "%s", _SL_);
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int
 326 tc_print_action_flush(FILE *f, const struct rtattr *arg)
 327 {
 328
 329         struct rtattr *tb[TCA_MAX + 1];
 330         int err = 0;
 331         struct action_util *a = NULL;
 332         __u32 *delete_count = 0;
 333
 334         parse_rtattr_nested(tb, TCA_MAX, arg);
 335
 336         if (tb[TCA_KIND] == NULL) {
 337                 fprintf(stderr, "NULL Action!\n");
 338                 return -1;
 339         }
 340
 341         a = get_action_kind(RTA_DATA(tb[TCA_KIND]));
 342         if (a == NULL)
 343                 return err;
 344
 345         delete_count = RTA_DATA(tb[TCA_FCNT]);
 346         fprintf(f, " %s (%d entries)\n", a->id, *delete_count);
 347         tab_flush = 0;
 348         return 0;
 349 }
 350
 351 int
 352 tc_print_action(FILE *f, const struct rtattr *arg, unsigned short tot_acts)
 353 {
 354
 355         int i;
 356
 357         if (arg == NULL)
 358                 return 0;
 359
 360         if (!tot_acts)
 361                 tot_acts = TCA_ACT_MAX_PRIO;
 362
 363         struct rtattr *tb[tot_acts + 1];
 364
 365         parse_rtattr_nested(tb, tot_acts, arg);
 366
 367         if (tab_flush && tb[0] && !tb[1])
 368                 return tc_print_action_flush(f, tb[0]);
 369
 370         open_json_array(PRINT_JSON, "actions");
 371         for (i = 0; i <= tot_acts; i++) {
 372                 if (tb[i]) {
 373                         open_json_object(NULL);
 374                         print_string(PRINT_FP, NULL, "%s", _SL_);
 375                         print_uint(PRINT_ANY, "order",
 376                                    "\taction order %u: ", i);
 377                         if (tc_print_one_action(f, tb[i]) < 0) {
 378                                 print_string(PRINT_FP, NULL,
 379                                              "Error printing action\n", NULL);
 380                         }
 381                         close_json_object();
 382                 }
 383
 384         }
 385         close_json_array(PRINT_JSON, NULL);
 386
 387         return 0;
 388 }
 389
 390 int print_action(struct nlmsghdr *n, void *arg)
 391 {
 392         FILE *fp = (FILE *)arg;
 393         struct tcamsg *t = NLMSG_DATA(n);
 394         int len = n->nlmsg_len;
 395         __u32 *tot_acts = NULL;
 396         struct rtattr *tb[TCA_ROOT_MAX+1];
 397
 398         len -= NLMSG_LENGTH(sizeof(*t));
 399
 400         if (len < 0) {
 401                 fprintf(stderr, "Wrong len %d\n", len);
 402                 return -1;
 403         }
 404
 405         parse_rtattr(tb, TCA_ROOT_MAX, TA_RTA(t), len);
 406
 407         if (tb[TCA_ROOT_COUNT])
 408                 tot_acts = RTA_DATA(tb[TCA_ROOT_COUNT]);
 409
 410         open_json_object(NULL);
 411         print_uint(PRINT_ANY, "total acts", "total acts %u",
 412                    tot_acts ? *tot_acts : 0);
 413         print_string(PRINT_FP, NULL, "%s", _SL_);
 414         close_json_object();
 415         if (tb[TCA_ACT_TAB] == NULL) {
 416                 if (n->nlmsg_type != RTM_GETACTION)
 417                         fprintf(stderr, "print_action: NULL kind\n");
 418                 return -1;
 419         }
 420
 421         if (n->nlmsg_type == RTM_DELACTION) {
 422                 if (n->nlmsg_flags & NLM_F_ROOT) {
 423                         fprintf(fp, "Flushed table ");
 424                         tab_flush = 1;
 425                 } else {
 426                         fprintf(fp, "Deleted action ");
 427                 }
 428         }
 429
 430         if (n->nlmsg_type == RTM_NEWACTION) {
 431                 if ((n->nlmsg_flags & NLM_F_CREATE) &&
 432                     !(n->nlmsg_flags & NLM_F_REPLACE)) {
 433                         fprintf(fp, "Added action ");
 434                 } else if (n->nlmsg_flags & NLM_F_REPLACE) {
 435                         fprintf(fp, "Replaced action ");
 436                 }
 437         }
 438
 439         open_json_object(NULL);
 440         tc_print_action(fp, tb[TCA_ACT_TAB], tot_acts ? *tot_acts:0);
 441         close_json_object();
 442
 443         return 0;
 444 }
 445
 446 static int tc_action_gd(int cmd, unsigned int flags,
 447                         int *argc_p, char ***argv_p)
 448 {
 449         char k[FILTER_NAMESZ];
 450         struct action_util *a = NULL;
 451         int argc = *argc_p;
 452         char **argv = *argv_p;
 453         int prio = 0;
 454         int ret = 0;
 455         __u32 i = 0;
 456         struct rtattr *tail;
 457         struct rtattr *tail2;
 458         struct nlmsghdr *ans = NULL;
 459
 460         struct {
 461                 struct nlmsghdr         n;
 462                 struct tcamsg           t;
 463                 char                    buf[MAX_MSG];
 464         } req = {
 465                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
 466                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
 467                 .n.nlmsg_type = cmd,
 468                 .t.tca_family = AF_UNSPEC,
 469         };
 470
 471         argc -= 1;
 472         argv += 1;
 473
 474
 475         tail = addattr_nest(&req.n, MAX_MSG, TCA_ACT_TAB);
 476
 477         while (argc > 0) {
 478                 if (strcmp(*argv, "action") == 0) {
 479                         argc--;
 480                         argv++;
 481                         continue;
 482                 } else if (strcmp(*argv, "help") == 0) {
 483                         return -1;
 484                 }
 485
 486                 strncpy(k, *argv, sizeof(k) - 1);
 487                 a = get_action_kind(k);
 488                 if (a == NULL) {
 489                         fprintf(stderr, "Error: non existent action: %s\n", k);
 490                         ret = -1;
 491                         goto bad_val;
 492                 }
 493                 if (strcmp(a->id, k) != 0) {
 494                         fprintf(stderr, "Error: non existent action: %s\n", k);
 495                         ret = -1;
 496                         goto bad_val;
 497                 }
 498
 499                 argc -= 1;
 500                 argv += 1;
 501                 if (argc <= 0) {
 502                         fprintf(stderr,
 503                                 "Error: no index specified action: %s\n", k);
 504                         ret = -1;
 505                         goto bad_val;
 506                 }
 507
 508                 if (matches(*argv, "index") == 0) {
 509                         NEXT_ARG();
 510                         if (get_u32(&i, *argv, 10)) {
 511                                 fprintf(stderr, "Illegal \"index\"\n");
 512                                 ret = -1;
 513                                 goto bad_val;
 514                         }
 515                         argc -= 1;
 516                         argv += 1;
 517                 } else {
 518                         fprintf(stderr,
 519                                 "Error: no index specified action: %s\n", k);
 520                         ret = -1;
 521                         goto bad_val;
 522                 }
 523
 524                 tail2 = addattr_nest(&req.n, MAX_MSG, ++prio);
 525                 addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 526                 if (i > 0)
 527                         addattr32(&req.n, MAX_MSG, TCA_ACT_INDEX, i);
 528                 addattr_nest_end(&req.n, tail2);
 529
 530         }
 531
 532         addattr_nest_end(&req.n, tail);
 533
 534         req.n.nlmsg_seq = rth.dump = ++rth.seq;
 535
 536         if (rtnl_talk(&rth, &req.n, cmd == RTM_DELACTION ? NULL : &ans) < 0) {
 537                 fprintf(stderr, "We have an error talking to the kernel\n");
 538                 return 1;
 539         }
 540
 541         if (cmd == RTM_GETACTION) {
 542                 new_json_obj(json);
 543                 ret = print_action(ans, stdout);
 544                 if (ret < 0) {
 545                         fprintf(stderr, "Dump terminated\n");
 546                         free(ans);
 547                         delete_json_obj();
 548                         return 1;
 549                 }
 550                 delete_json_obj();
 551         }
 552         free(ans);
 553
 554         *argc_p = argc;
 555         *argv_p = argv;
 556 bad_val:
 557         return ret;
 558 }
 559
 560 struct tc_action_req {
 561         struct nlmsghdr         n;
 562         struct tcamsg           t;
 563         char                    buf[MAX_MSG];
 564 };
 565
 566 static int tc_action_modify(int cmd, unsigned int flags,
 567                             int *argc_p, char ***argv_p,
 568                             void *buf, size_t buflen)
 569 {
 570         struct tc_action_req *req, action_req;
 571         char **argv = *argv_p;
 572         struct rtattr *tail;
 573         int argc = *argc_p;
 574         struct iovec iov;
 575         int ret = 0;
 576
 577         if (buf) {
 578                 req = buf;
 579                 if (buflen < sizeof (struct tc_action_req)) {
 580                         fprintf(stderr, "buffer is too small: %zu\n", buflen);
 581                         return -1;
 582                 }
 583         } else {
 584                 memset(&action_req, 0, sizeof (struct tc_action_req));
 585                 req = &action_req;
 586         }
 587
 588         req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg));
 589         req->n.nlmsg_flags = NLM_F_REQUEST | flags;
 590         req->n.nlmsg_type = cmd;
 591         req->t.tca_family = AF_UNSPEC;
 592         tail = NLMSG_TAIL(&req->n);
 593
 594         argc -= 1;
 595         argv += 1;
 596         if (parse_action(&argc, &argv, TCA_ACT_TAB, &req->n)) {
 597                 fprintf(stderr, "Illegal \"action\"\n");
 598                 return -1;
 599         }
 600         tail->rta_len = (void *) NLMSG_TAIL(&req->n) - (void *) tail;
 601
 602         *argc_p = argc;
 603         *argv_p = argv;
 604
 605         if (buf)
 606                 return 0;
 607
 608         iov.iov_base = &req->n;
 609         iov.iov_len = req->n.nlmsg_len;
 610         if (rtnl_talk_iov(&rth, &iov, 1, NULL) < 0) {
 611                 fprintf(stderr, "We have an error talking to the kernel\n");
 612                 ret = -1;
 613         }
 614
 615         return ret;
 616 }
 617
 618 static int tc_act_list_or_flush(int *argc_p, char ***argv_p, int event)
 619 {
 620         struct rtattr *tail, *tail2, *tail3, *tail4;
 621         int ret = 0, prio = 0, msg_size = 0;
 622         struct action_util *a = NULL;
 623         struct nla_bitfield32 flag_select = { 0 };
 624         char **argv = *argv_p;
 625         __u32 msec_since = 0;
 626         int argc = *argc_p;
 627         char k[FILTER_NAMESZ];
 628         struct {
 629                 struct nlmsghdr         n;
 630                 struct tcamsg           t;
 631                 char                    buf[MAX_MSG];
 632         } req = {
 633                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
 634                 .t.tca_family = AF_UNSPEC,
 635         };
 636
 637         tail = addattr_nest(&req.n, MAX_MSG, TCA_ACT_TAB);
 638         tail2 = NLMSG_TAIL(&req.n);
 639
 640         strncpy(k, *argv, sizeof(k) - 1);
 641 #ifdef CONFIG_GACT
 642         if (!gact_ld)
 643                 get_action_kind("gact");
 644
 645 #endif
 646         a = get_action_kind(k);
 647         if (a == NULL) {
 648                 fprintf(stderr, "bad action %s\n", k);
 649                 goto bad_val;
 650         }
 651         if (strcmp(a->id, k) != 0) {
 652                 fprintf(stderr, "bad action %s\n", k);
 653                 goto bad_val;
 654         }
 655         strncpy(k, *argv, sizeof(k) - 1);
 656
 657         argc -= 1;
 658         argv += 1;
 659
 660         if (argc && (strcmp(*argv, "since") == 0)) {
 661                 NEXT_ARG();
 662                 if (get_u32(&msec_since, *argv, 0))
 663                         invarg("dump time \"since\" is invalid", *argv);
 664         }
 665
 666         addattr_l(&req.n, MAX_MSG, ++prio, NULL, 0);
 667         addattr_l(&req.n, MAX_MSG, TCA_ACT_KIND, k, strlen(k) + 1);
 668         tail2->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail2;
 669         addattr_nest_end(&req.n, tail);
 670
 671         tail3 = NLMSG_TAIL(&req.n);
 672         flag_select.value |= TCA_FLAG_LARGE_DUMP_ON;
 673         flag_select.selector |= TCA_FLAG_LARGE_DUMP_ON;
 674         addattr_l(&req.n, MAX_MSG, TCA_ROOT_FLAGS, &flag_select,
 675                   sizeof(struct nla_bitfield32));
 676         tail3->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail3;
 677         if (msec_since) {
 678                 tail4 = NLMSG_TAIL(&req.n);
 679                 addattr32(&req.n, MAX_MSG, TCA_ROOT_TIME_DELTA, msec_since);
 680                 tail4->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail4;
 681         }
 682         msg_size = NLMSG_ALIGN(req.n.nlmsg_len)
 683                 - NLMSG_ALIGN(sizeof(struct nlmsghdr));
 684
 685         if (event == RTM_GETACTION) {
 686                 if (rtnl_dump_request(&rth, event,
 687                                       (void *)&req.t, msg_size) < 0) {
 688                         perror("Cannot send dump request");
 689                         return 1;
 690                 }
 691                 new_json_obj(json);
 692                 ret = rtnl_dump_filter(&rth, print_action, stdout);
 693                 delete_json_obj();
 694         }
 695
 696         if (event == RTM_DELACTION) {
 697                 req.n.nlmsg_len = NLMSG_ALIGN(req.n.nlmsg_len);
 698                 req.n.nlmsg_type = RTM_DELACTION;
 699                 req.n.nlmsg_flags |= NLM_F_ROOT;
 700                 req.n.nlmsg_flags |= NLM_F_REQUEST;
 701                 if (rtnl_talk(&rth, &req.n, NULL) < 0) {
 702                         fprintf(stderr, "We have an error flushing\n");
 703                         return 1;
 704                 }
 705
 706         }
 707
 708 bad_val:
 709
 710         *argc_p = argc;
 711         *argv_p = argv;
 712         return ret;
 713 }
 714
 715 int do_action(int argc, char **argv, void *buf, size_t buflen)
 716 {
 717
 718         int ret = 0;
 719
 720         while (argc > 0) {
 721
 722                 if (matches(*argv, "add") == 0) {
 723                         ret =  tc_action_modify(RTM_NEWACTION,
 724                                                 NLM_F_EXCL | NLM_F_CREATE,
 725                                                 &argc, &argv, buf, buflen);
 726                 } else if (matches(*argv, "change") == 0 ||
 727                           matches(*argv, "replace") == 0) {
 728                         ret = tc_action_modify(RTM_NEWACTION,
 729                                                NLM_F_CREATE | NLM_F_REPLACE,
 730                                                &argc, &argv, buf, buflen);
 731                 } else if (matches(*argv, "delete") == 0) {
 732                         argc -= 1;
 733                         argv += 1;
 734                         ret = tc_action_gd(RTM_DELACTION, 0,  &argc, &argv);
 735                 } else if (matches(*argv, "get") == 0) {
 736                         argc -= 1;
 737                         argv += 1;
 738                         ret = tc_action_gd(RTM_GETACTION, 0,  &argc, &argv);
 739                 } else if (matches(*argv, "list") == 0 ||
 740                            matches(*argv, "show") == 0 ||
 741                            matches(*argv, "lst") == 0) {
 742                         if (argc <= 2) {
 743                                 act_usage();
 744                                 return -1;
 745                         }
 746
 747                         argc -= 2;
 748                         argv += 2;
 749                         return tc_act_list_or_flush(&argc, &argv,
 750                                                     RTM_GETACTION);
 751                 } else if (matches(*argv, "flush") == 0) {
 752                         if (argc <= 2) {
 753                                 act_usage();
 754                                 return -1;
 755                         }
 756
 757                         argc -= 2;
 758                         argv += 2;
 759                         return tc_act_list_or_flush(&argc, &argv,
 760                                                     RTM_DELACTION);
 761                 } else if (matches(*argv, "help") == 0) {
 762                         act_usage();
 763                         return -1;
 764                 } else {
 765                         fprintf(stderr,
 766                                 "Command \"%s\" is unknown, try \"tc actions help\".\n",
 767                                 *argv);
 768                         return -1;
 769                 }
 770
 771                 if (ret < 0)
 772                         return -1;
 773         }
 774
 775         return 0;
 776 }