networking/tc.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4  *
   5  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  * Bernhard Reutner-Fischer adjusted for busybox
   8  */
   9
  10 //usage:#define tc_trivial_usage
  11 /* //usage: "[OPTIONS] OBJECT CMD [dev STRING]" */
  12 //usage:        "OBJECT CMD [dev STRING]"
  13 //usage:#define tc_full_usage "\n\n"
  14 //usage:        "OBJECT: {qdisc|class|filter}\n"
  15 //usage:        "CMD: {add|del|change|replace|show}\n"
  16 //usage:        "\n"
  17 //usage:        "qdisc [ handle QHANDLE ] [ root |"IF_FEATURE_TC_INGRESS(" ingress |")" parent CLASSID ]\n"
  18 /* //usage: "[ estimator INTERVAL TIME_CONSTANT ]\n" */
  19 //usage:        "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
  20 //usage:        "       QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n"
  21 //usage:        "qdisc show [ dev STRING ]"IF_FEATURE_TC_INGRESS(" [ingress]")"\n"
  22 //usage:        "class [ classid CLASSID ] [ root | parent CLASSID ]\n"
  23 //usage:        "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
  24 //usage:        "class show [ dev STRING ] [ root | parent CLASSID ]\n"
  25 //usage:        "filter [ pref PRIO ] [ protocol PROTO ]\n"
  26 /* //usage: "\t[ estimator INTERVAL TIME_CONSTANT ]\n" */
  27 //usage:        "       [ root | classid CLASSID ] [ handle FILTERID ]\n"
  28 //usage:        "       [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n"
  29 //usage:        "filter show [ dev STRING ] [ root | parent CLASSID ]"
  30
  31 #include "libbb.h"
  32
  33 #include "libiproute/utils.h"
  34 #include "libiproute/ip_common.h"
  35 #include "libiproute/rt_names.h"
  36 #include <linux/pkt_sched.h> /* for the TC_H_* macros */
  37
  38 #define parse_rtattr_nested(tb, max, rta) \
  39         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  40
  41 /* nullifies tb on error */
  42 #define __parse_rtattr_nested_compat(tb, max, rta, len) \
  43         ({if ((RTA_PAYLOAD(rta) >= len) && \
  44                  (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr))) { \
  45                         rta = RTA_DATA(rta) + RTA_ALIGN(len); \
  46                         parse_rtattr_nested(tb, max, rta); \
  47           } else \
  48                         memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); \
  49         })
  50
  51 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
  52         ({data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
  53         __parse_rtattr_nested_compat(tb, max, rta, len); })
  54
  55 #define show_details (0) /* not implemented. Does anyone need it? */
  56 #define use_iec (0) /* not currently documented in the upstream manpage */
  57
  58
  59 struct globals {
  60         int filter_ifindex;
  61         uint32_t filter_qdisc;
  62         uint32_t filter_parent;
  63         uint32_t filter_prio;
  64         uint32_t filter_proto;
  65 } FIX_ALIASING;
  66 #define G (*(struct globals*)&bb_common_bufsiz1)
  67 #define filter_ifindex (G.filter_ifindex)
  68 #define filter_qdisc (G.filter_qdisc)
  69 #define filter_parent (G.filter_parent)
  70 #define filter_prio (G.filter_prio)
  71 #define filter_proto (G.filter_proto)
  72 #define INIT_G() do { \
  73         BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
  74 } while (0)
  75
  76 /* Allocates a buffer containing the name of a class id.
  77  * The caller must free the returned memory.  */
  78 static char* print_tc_classid(uint32_t cid)
  79 {
  80 #if 0 /* IMPOSSIBLE */
  81         if (cid == TC_H_ROOT)
  82                 return xasprintf("root");
  83         else
  84 #endif
  85         if (cid == TC_H_UNSPEC)
  86                 return xasprintf("none");
  87         else if (TC_H_MAJ(cid) == 0)
  88                 return xasprintf(":%x", TC_H_MIN(cid));
  89         else if (TC_H_MIN(cid) == 0)
  90                 return xasprintf("%x:", TC_H_MAJ(cid)>>16);
  91         else
  92                 return xasprintf("%x:%x", TC_H_MAJ(cid)>>16, TC_H_MIN(cid));
  93 }
  94
  95 /* Get a qdisc handle.  Return 0 on success, !0 otherwise.  */
  96 static int get_qdisc_handle(uint32_t *h, const char *str) {
  97         uint32_t maj;
  98         char *p;
  99
 100         maj = TC_H_UNSPEC;
 101         if (!strcmp(str, "none"))
 102                 goto ok;
 103         maj = strtoul(str, &p, 16);
 104         if (p == str)
 105                 return 1;
 106         maj <<= 16;
 107         if (*p != ':' && *p != '\0')
 108                 return 1;
 109  ok:
 110         *h = maj;
 111         return 0;
 112 }
 113
 114 /* Get class ID.  Return 0 on success, !0 otherwise.  */
 115 static int get_tc_classid(uint32_t *h, const char *str) {
 116         uint32_t maj, min;
 117         char *p;
 118
 119         maj = TC_H_ROOT;
 120         if (!strcmp(str, "root"))
 121                 goto ok;
 122         maj = TC_H_UNSPEC;
 123         if (!strcmp(str, "none"))
 124                 goto ok;
 125         maj = strtoul(str, &p, 16);
 126         if (p == str) {
 127                 if (*p != ':')
 128                         return 1;
 129                 maj = 0;
 130         }
 131         if (*p == ':') {
 132                 if (maj >= (1<<16))
 133                         return 1;
 134                 maj <<= 16;
 135                 str = p + 1;
 136                 min = strtoul(str, &p, 16);
 137 //FIXME: check for "" too?
 138                 if (*p != '\0' || min >= (1<<16))
 139                         return 1;
 140                 maj |= min;
 141         } else if (*p != 0)
 142                 return 1;
 143  ok:
 144         *h = maj;
 145         return 0;
 146 }
 147
 148 static void print_rate(char *buf, int len, uint32_t rate)
 149 {
 150         double tmp = (double)rate*8;
 151
 152         if (use_iec) {
 153                 if (tmp >= 1000*1024*1024)
 154                         snprintf(buf, len, "%.0fMibit", tmp/(1024*1024));
 155                 else if (tmp >= 1000*1024)
 156                         snprintf(buf, len, "%.0fKibit", tmp/1024);
 157                 else
 158                         snprintf(buf, len, "%.0fbit", tmp);
 159         } else {
 160                 if (tmp >= 1000*1000000)
 161                         snprintf(buf, len, "%.0fMbit", tmp/1000000);
 162                 else if (tmp >= 1000*1000)
 163                         snprintf(buf, len, "%.0fKbit", tmp/1000);
 164                 else
 165                         snprintf(buf, len, "%.0fbit",  tmp);
 166         }
 167 }
 168
 169 /* This is "pfifo_fast".  */
 170 static int prio_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 171 {
 172         return 0;
 173 }
 174 static int prio_print_opt(struct rtattr *opt)
 175 {
 176         int i;
 177         struct tc_prio_qopt *qopt;
 178         struct rtattr *tb[TCA_PRIO_MAX+1];
 179
 180         if (opt == NULL)
 181                 return 0;
 182         parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt, sizeof(*qopt));
 183         if (tb == NULL)
 184                 return 0;
 185         printf("bands %u priomap ", qopt->bands);
 186         for (i=0; i<=TC_PRIO_MAX; i++)
 187                 printf(" %d", qopt->priomap[i]);
 188
 189         if (tb[TCA_PRIO_MQ])
 190                 printf(" multiqueue: o%s ",
 191                     *(unsigned char *)RTA_DATA(tb[TCA_PRIO_MQ]) ? "n" : "ff");
 192
 193         return 0;
 194 }
 195
 196 /* Class Based Queue */
 197 static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 198 {
 199         return 0;
 200 }
 201 static int cbq_print_opt(struct rtattr *opt)
 202 {
 203         struct rtattr *tb[TCA_CBQ_MAX+1];
 204         struct tc_ratespec *r = NULL;
 205         struct tc_cbq_lssopt *lss = NULL;
 206         struct tc_cbq_wrropt *wrr = NULL;
 207         struct tc_cbq_fopt *fopt = NULL;
 208         struct tc_cbq_ovl *ovl = NULL;
 209         const char *const error = "CBQ: too short %s opt";
 210         char buf[64];
 211
 212         if (opt == NULL)
 213                 goto done;
 214         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
 215
 216         if (tb[TCA_CBQ_RATE]) {
 217                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
 218                         bb_error_msg(error, "rate");
 219                 else
 220                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
 221         }
 222         if (tb[TCA_CBQ_LSSOPT]) {
 223                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
 224                         bb_error_msg(error, "lss");
 225                 else
 226                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
 227         }
 228         if (tb[TCA_CBQ_WRROPT]) {
 229                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
 230                         bb_error_msg(error, "wrr");
 231                 else
 232                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
 233         }
 234         if (tb[TCA_CBQ_FOPT]) {
 235                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
 236                         bb_error_msg(error, "fopt");
 237                 else
 238                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
 239         }
 240         if (tb[TCA_CBQ_OVL_STRATEGY]) {
 241                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
 242                         bb_error_msg("CBQ: too short overlimit strategy %u/%u",
 243                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 244                                 (unsigned) sizeof(*ovl));
 245                 else
 246                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 247         }
 248
 249         if (r) {
 250                 print_rate(buf, sizeof(buf), r->rate);
 251                 printf("rate %s ", buf);
 252                 if (show_details) {
 253                         printf("cell %ub ", 1<<r->cell_log);
 254                         if (r->mpu)
 255                                 printf("mpu %ub ", r->mpu);
 256                         if (r->overhead)
 257                                 printf("overhead %ub ", r->overhead);
 258                 }
 259         }
 260         if (lss && lss->flags) {
 261                 bool comma = false;
 262                 bb_putchar('(');
 263                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 264                         printf("bounded");
 265                         comma = true;
 266                 }
 267                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 268                         if (comma)
 269                                 bb_putchar(',');
 270                         printf("isolated");
 271                 }
 272                 printf(") ");
 273         }
 274         if (wrr) {
 275                 if (wrr->priority != TC_CBQ_MAXPRIO)
 276                         printf("prio %u", wrr->priority);
 277                 else
 278                         printf("prio no-transmit");
 279                 if (show_details) {
 280                         printf("/%u ", wrr->cpriority);
 281                         if (wrr->weight != 1) {
 282                                 print_rate(buf, sizeof(buf), wrr->weight);
 283                                 printf("weight %s ", buf);
 284                         }
 285                         if (wrr->allot)
 286                                 printf("allot %ub ", wrr->allot);
 287                 }
 288         }
 289  done:
 290         return 0;
 291 }
 292
 293 static int print_qdisc(const struct sockaddr_nl *who UNUSED_PARAM,
 294                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 295 {
 296         struct tcmsg *msg = NLMSG_DATA(hdr);
 297         int len = hdr->nlmsg_len;
 298         struct rtattr * tb[TCA_MAX+1];
 299         char *name;
 300
 301         if (hdr->nlmsg_type != RTM_NEWQDISC && hdr->nlmsg_type != RTM_DELQDISC) {
 302                 /* bb_error_msg("not a qdisc"); */
 303                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 304         }
 305         len -= NLMSG_LENGTH(sizeof(*msg));
 306         if (len < 0) {
 307                 /* bb_error_msg("wrong len %d", len); */
 308                 return -1;
 309         }
 310         /* not the desired interface? */
 311         if (filter_ifindex && filter_ifindex != msg->tcm_ifindex)
 312                 return 0;
 313         memset (tb, 0, sizeof(tb));
 314         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 315         if (tb[TCA_KIND] == NULL) {
 316                 /* bb_error_msg("%s: NULL kind", "qdisc"); */
 317                 return -1;
 318         }
 319         if (hdr->nlmsg_type == RTM_DELQDISC)
 320                 printf("deleted ");
 321         name = (char*)RTA_DATA(tb[TCA_KIND]);
 322         printf("qdisc %s %x: ", name, msg->tcm_handle>>16);
 323         if (filter_ifindex == 0)
 324                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 325         if (msg->tcm_parent == TC_H_ROOT)
 326                 printf("root ");
 327         else if (msg->tcm_parent) {
 328                 char *classid = print_tc_classid(msg->tcm_parent);
 329                 printf("parent %s ", classid);
 330                 if (ENABLE_FEATURE_CLEAN_UP)
 331                         free(classid);
 332         }
 333         if (msg->tcm_info != 1)
 334                 printf("refcnt %d ", msg->tcm_info);
 335         if (tb[TCA_OPTIONS]) {
 336                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 337                 int qqq = index_in_strings(_q_, name);
 338                 if (qqq == 0) { /* pfifo_fast aka prio */
 339                         prio_print_opt(tb[TCA_OPTIONS]);
 340                 } else if (qqq == 1) { /* class based queuing */
 341                         cbq_print_opt(tb[TCA_OPTIONS]);
 342                 } else
 343                         bb_error_msg("unknown %s", name);
 344         }
 345         bb_putchar('\n');
 346         return 0;
 347 }
 348
 349 static int print_class(const struct sockaddr_nl *who UNUSED_PARAM,
 350                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 351 {
 352         struct tcmsg *msg = NLMSG_DATA(hdr);
 353         int len = hdr->nlmsg_len;
 354         struct rtattr * tb[TCA_MAX+1];
 355         char *name, *classid;
 356
 357         /*XXX Eventually factor out common code */
 358
 359         if (hdr->nlmsg_type != RTM_NEWTCLASS && hdr->nlmsg_type != RTM_DELTCLASS) {
 360                 /* bb_error_msg("not a class"); */
 361                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 362         }
 363         len -= NLMSG_LENGTH(sizeof(*msg));
 364         if (len < 0) {
 365                 /* bb_error_msg("wrong len %d", len); */
 366                 return -1;
 367         }
 368         /* not the desired interface? */
 369         if (filter_qdisc && TC_H_MAJ(msg->tcm_handle^filter_qdisc))
 370                 return 0;
 371         memset (tb, 0, sizeof(tb));
 372         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 373         if (tb[TCA_KIND] == NULL) {
 374                 /* bb_error_msg("%s: NULL kind", "class"); */
 375                 return -1;
 376         }
 377         if (hdr->nlmsg_type == RTM_DELTCLASS)
 378                 printf("deleted ");
 379
 380         name = (char*)RTA_DATA(tb[TCA_KIND]);
 381         classid = !msg->tcm_handle ? NULL : print_tc_classid(
 382                                 filter_qdisc ? TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 383         printf ("class %s %s", name, classid);
 384         if (ENABLE_FEATURE_CLEAN_UP)
 385                 free(classid);
 386
 387         if (filter_ifindex == 0)
 388                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 389         if (msg->tcm_parent == TC_H_ROOT)
 390                 printf("root ");
 391         else if (msg->tcm_parent) {
 392                 classid = print_tc_classid(filter_qdisc ?
 393                                 TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 394                 printf("parent %s ", classid);
 395                 if (ENABLE_FEATURE_CLEAN_UP)
 396                         free(classid);
 397         }
 398         if (msg->tcm_info)
 399                 printf("leaf %x ", msg->tcm_info >> 16);
 400         /* Do that get_qdisc_kind(RTA_DATA(tb[TCA_KIND])).  */
 401         if (tb[TCA_OPTIONS]) {
 402                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 403                 int qqq = index_in_strings(_q_, name);
 404                 if (qqq == 0) { /* pfifo_fast aka prio */
 405                         /* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
 406                 } else if (qqq == 1) { /* class based queuing */
 407                         /* cbq_print_copt() is identical to cbq_print_opt(). */
 408                         cbq_print_opt(tb[TCA_OPTIONS]);
 409                 } else
 410                         bb_error_msg("unknown %s", name);
 411         }
 412         bb_putchar('\n');
 413
 414         return 0;
 415 }
 416
 417 static int print_filter(const struct sockaddr_nl *who UNUSED_PARAM,
 418                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 419 {
 420         return 0;
 421 }
 422
 423 int tc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 424 int tc_main(int argc UNUSED_PARAM, char **argv)
 425 {
 426         static const char objects[] ALIGN1 =
 427                 "qdisc\0""class\0""filter\0"
 428                 ;
 429         enum { OBJ_qdisc = 0, OBJ_class, OBJ_filter };
 430         static const char commands[] ALIGN1 =
 431                 "add\0""delete\0""change\0"
 432                 "link\0" /* only qdisc */
 433                 "replace\0"
 434                 "show\0""list\0"
 435                 ;
 436         static const char args[] ALIGN1 =
 437                 "dev\0" /* qdisc, class, filter */
 438                 "root\0" /* class, filter */
 439                 "parent\0" /* class, filter */
 440                 "qdisc\0" /* class */
 441                 "handle\0" /* change: qdisc, class(classid) list: filter */
 442                 "classid\0" /* change: for class use "handle" */
 443                 "preference\0""priority\0""protocol\0" /* filter */
 444                 ;
 445         enum { CMD_add = 0, CMD_del, CMD_change, CMD_link, CMD_replace, CMD_show };
 446         enum { ARG_dev = 0, ARG_root, ARG_parent, ARG_qdisc,
 447                         ARG_handle, ARG_classid, ARG_pref, ARG_prio, ARG_proto};
 448         struct rtnl_handle rth;
 449         struct tcmsg msg;
 450         int ret, obj, cmd, arg;
 451         char *dev = NULL;
 452
 453         INIT_G();
 454
 455         if (!*++argv)
 456                 bb_show_usage();
 457         xrtnl_open(&rth);
 458         ret = EXIT_SUCCESS;
 459
 460         obj = index_in_substrings(objects, *argv++);
 461
 462         if (obj < OBJ_qdisc)
 463                 bb_show_usage();
 464         if (!*argv)
 465                 cmd = CMD_show; /* list is the default */
 466         else {
 467                 cmd = index_in_substrings(commands, *argv);
 468                 if (cmd < 0)
 469                         bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
 470                 argv++;
 471         }
 472         memset(&msg, 0, sizeof(msg));
 473         msg.tcm_family = AF_UNSPEC;
 474         ll_init_map(&rth);
 475         while (*argv) {
 476                 arg = index_in_substrings(args, *argv);
 477                 if (arg == ARG_dev) {
 478                         NEXT_ARG();
 479                         if (dev)
 480                                 duparg2("dev", *argv);
 481                         dev = *argv++;
 482                         msg.tcm_ifindex = xll_name_to_index(dev);
 483                         if (cmd >= CMD_show)
 484                                 filter_ifindex = msg.tcm_ifindex;
 485                 } else
 486                 if ((arg == ARG_qdisc && obj == OBJ_class && cmd >= CMD_show)
 487                  || (arg == ARG_handle && obj == OBJ_qdisc && cmd == CMD_change)
 488                 ) {
 489                         NEXT_ARG();
 490                         /* We don't care about duparg2("qdisc handle",*argv) for now */
 491                         if (get_qdisc_handle(&filter_qdisc, *argv))
 492                                 invarg(*argv, "qdisc");
 493                 } else
 494                 if (obj != OBJ_qdisc
 495                  && (arg == ARG_root
 496                     || arg == ARG_parent
 497                     || (obj == OBJ_filter && arg >= ARG_pref)
 498                     )
 499                 ) {
 500                         /* nothing */
 501                 } else {
 502                         invarg(*argv, "command");
 503                 }
 504                 NEXT_ARG();
 505                 if (arg == ARG_root) {
 506                         if (msg.tcm_parent)
 507                                 duparg("parent", *argv);
 508                         msg.tcm_parent = TC_H_ROOT;
 509                         if (obj == OBJ_filter)
 510                                 filter_parent = TC_H_ROOT;
 511                 } else if (arg == ARG_parent) {
 512                         uint32_t handle;
 513                         if (msg.tcm_parent)
 514                                 duparg(*argv, "parent");
 515                         if (get_tc_classid(&handle, *argv))
 516                                 invarg(*argv, "parent");
 517                         msg.tcm_parent = handle;
 518                         if (obj == OBJ_filter)
 519                                 filter_parent = handle;
 520                 } else if (arg == ARG_handle) { /* filter::list */
 521                         if (msg.tcm_handle)
 522                                 duparg(*argv, "handle");
 523                         /* reject LONG_MIN || LONG_MAX */
 524                         /* TODO: for fw
 525                         slash = strchr(handle, '/');
 526                         if (slash != NULL)
 527                                    *slash = '\0';
 528                          */
 529                         msg.tcm_handle = get_u32(*argv, "handle");
 530                         /* if (slash) {if (get_u32(uint32_t &mask, slash+1, NULL)) inv mask; addattr32(n, MAX_MSG, TCA_FW_MASK, mask); */
 531                 } else if (arg == ARG_classid && obj == OBJ_class && cmd == CMD_change){
 532                 } else if (arg == ARG_pref || arg == ARG_prio) { /* filter::list */
 533                         if (filter_prio)
 534                                 duparg(*argv, "priority");
 535                         filter_prio = get_u32(*argv, "priority");
 536                 } else if (arg == ARG_proto) { /* filter::list */
 537                         uint16_t tmp;
 538                         if (filter_proto)
 539                                 duparg(*argv, "protocol");
 540                         if (ll_proto_a2n(&tmp, *argv))
 541                                 invarg(*argv, "protocol");
 542                         filter_proto = tmp;
 543                 }
 544         }
 545         if (cmd >= CMD_show) { /* show or list */
 546                 if (obj == OBJ_filter)
 547                         msg.tcm_info = TC_H_MAKE(filter_prio<<16, filter_proto);
 548                 if (rtnl_dump_request(&rth, obj == OBJ_qdisc ? RTM_GETQDISC :
 549                                                 obj == OBJ_class ? RTM_GETTCLASS : RTM_GETTFILTER,
 550                                                 &msg, sizeof(msg)) < 0)
 551                         bb_simple_perror_msg_and_die("can't send dump request");
 552
 553                 xrtnl_dump_filter(&rth, obj == OBJ_qdisc ? print_qdisc :
 554                                                 obj == OBJ_class ? print_class : print_filter,
 555                                                 NULL);
 556         }
 557         if (ENABLE_FEATURE_CLEAN_UP) {
 558                 rtnl_close(&rth);
 559         }
 560         return ret;
 561 }