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 //kbuild:lib-$(CONFIG_TC) += tc.o
  10
  11 //usage:#define tc_trivial_usage
  12 /* //usage: "[OPTIONS] OBJECT CMD [dev STRING]" */
  13 //usage:        "OBJECT CMD [dev STRING]"
  14 //usage:#define tc_full_usage "\n\n"
  15 //usage:        "OBJECT: {qdisc|class|filter}\n"
  16 //usage:        "CMD: {add|del|change|replace|show}\n"
  17 //usage:        "\n"
  18 //usage:        "qdisc [ handle QHANDLE ] [ root |"IF_FEATURE_TC_INGRESS(" ingress |")" parent CLASSID ]\n"
  19 /* //usage: "[ estimator INTERVAL TIME_CONSTANT ]\n" */
  20 //usage:        "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
  21 //usage:        "       QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n"
  22 //usage:        "qdisc show [ dev STRING ]"IF_FEATURE_TC_INGRESS(" [ingress]")"\n"
  23 //usage:        "class [ classid CLASSID ] [ root | parent CLASSID ]\n"
  24 //usage:        "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
  25 //usage:        "class show [ dev STRING ] [ root | parent CLASSID ]\n"
  26 //usage:        "filter [ pref PRIO ] [ protocol PROTO ]\n"
  27 /* //usage: "\t[ estimator INTERVAL TIME_CONSTANT ]\n" */
  28 //usage:        "       [ root | classid CLASSID ] [ handle FILTERID ]\n"
  29 //usage:        "       [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n"
  30 //usage:        "filter show [ dev STRING ] [ root | parent CLASSID ]"
  31
  32 #include "libbb.h"
  33 #include "common_bufsiz.h"
  34
  35 #include "libiproute/utils.h"
  36 #include "libiproute/ip_common.h"
  37 #include "libiproute/rt_names.h"
  38 #include <linux/pkt_sched.h> /* for the TC_H_* macros */
  39
  40 #define parse_rtattr_nested(tb, max, rta) \
  41         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  42
  43 /* nullifies tb on error */
  44 #define __parse_rtattr_nested_compat(tb, max, rta, len) \
  45         ({if ((RTA_PAYLOAD(rta) >= len) && \
  46                  (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr))) { \
  47                         rta = RTA_DATA(rta) + RTA_ALIGN(len); \
  48                         parse_rtattr_nested(tb, max, rta); \
  49           } else \
  50                         memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); \
  51         })
  52
  53 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
  54         ({data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
  55         __parse_rtattr_nested_compat(tb, max, rta, len); })
  56
  57 #define show_details (0) /* not implemented. Does anyone need it? */
  58 #define use_iec (0) /* not currently documented in the upstream manpage */
  59
  60
  61 struct globals {
  62         int filter_ifindex;
  63         uint32_t filter_qdisc;
  64         uint32_t filter_parent;
  65         uint32_t filter_prio;
  66         uint32_t filter_proto;
  67 } FIX_ALIASING;
  68 #define G (*(struct globals*)bb_common_bufsiz1)
  69 #define filter_ifindex (G.filter_ifindex)
  70 #define filter_qdisc (G.filter_qdisc)
  71 #define filter_parent (G.filter_parent)
  72 #define filter_prio (G.filter_prio)
  73 #define filter_proto (G.filter_proto)
  74 #define INIT_G() do { \
  75         setup_common_bufsiz(); \
  76         BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
  77 } while (0)
  78
  79 /* Allocates a buffer containing the name of a class id.
  80  * The caller must free the returned memory.  */
  81 static char* print_tc_classid(uint32_t cid)
  82 {
  83 #if 0 /* IMPOSSIBLE */
  84         if (cid == TC_H_ROOT)
  85                 return xasprintf("root");
  86         else
  87 #endif
  88         if (cid == TC_H_UNSPEC)
  89                 return xasprintf("none");
  90         else if (TC_H_MAJ(cid) == 0)
  91                 return xasprintf(":%x", TC_H_MIN(cid));
  92         else if (TC_H_MIN(cid) == 0)
  93                 return xasprintf("%x:", TC_H_MAJ(cid)>>16);
  94         else
  95                 return xasprintf("%x:%x", TC_H_MAJ(cid)>>16, TC_H_MIN(cid));
  96 }
  97
  98 /* Get a qdisc handle.  Return 0 on success, !0 otherwise.  */
  99 static int get_qdisc_handle(uint32_t *h, const char *str) {
 100         uint32_t maj;
 101         char *p;
 102
 103         maj = TC_H_UNSPEC;
 104         if (!strcmp(str, "none"))
 105                 goto ok;
 106         maj = strtoul(str, &p, 16);
 107         if (p == str)
 108                 return 1;
 109         maj <<= 16;
 110         if (*p != ':' && *p != '\0')
 111                 return 1;
 112  ok:
 113         *h = maj;
 114         return 0;
 115 }
 116
 117 /* Get class ID.  Return 0 on success, !0 otherwise.  */
 118 static int get_tc_classid(uint32_t *h, const char *str) {
 119         uint32_t maj, min;
 120         char *p;
 121
 122         maj = TC_H_ROOT;
 123         if (!strcmp(str, "root"))
 124                 goto ok;
 125         maj = TC_H_UNSPEC;
 126         if (!strcmp(str, "none"))
 127                 goto ok;
 128         maj = strtoul(str, &p, 16);
 129         if (p == str) {
 130                 if (*p != ':')
 131                         return 1;
 132                 maj = 0;
 133         }
 134         if (*p == ':') {
 135                 if (maj >= (1<<16))
 136                         return 1;
 137                 maj <<= 16;
 138                 str = p + 1;
 139                 min = strtoul(str, &p, 16);
 140 //FIXME: check for "" too?
 141                 if (*p != '\0' || min >= (1<<16))
 142                         return 1;
 143                 maj |= min;
 144         } else if (*p != 0)
 145                 return 1;
 146  ok:
 147         *h = maj;
 148         return 0;
 149 }
 150
 151 static void print_rate(char *buf, int len, uint32_t rate)
 152 {
 153         double tmp = (double)rate*8;
 154
 155         if (use_iec) {
 156                 if (tmp >= 1000*1024*1024)
 157                         snprintf(buf, len, "%.0fMibit", tmp/(1024*1024));
 158                 else if (tmp >= 1000*1024)
 159                         snprintf(buf, len, "%.0fKibit", tmp/1024);
 160                 else
 161                         snprintf(buf, len, "%.0fbit", tmp);
 162         } else {
 163                 if (tmp >= 1000*1000000)
 164                         snprintf(buf, len, "%.0fMbit", tmp/1000000);
 165                 else if (tmp >= 1000*1000)
 166                         snprintf(buf, len, "%.0fKbit", tmp/1000);
 167                 else
 168                         snprintf(buf, len, "%.0fbit",  tmp);
 169         }
 170 }
 171
 172 /* This is "pfifo_fast".  */
 173 static int prio_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 174 {
 175         return 0;
 176 }
 177 static int prio_print_opt(struct rtattr *opt)
 178 {
 179         int i;
 180         struct tc_prio_qopt *qopt;
 181         struct rtattr *tb[TCA_PRIO_MAX+1];
 182
 183         if (opt == NULL)
 184                 return 0;
 185         parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt, sizeof(*qopt));
 186         if (tb == NULL)
 187                 return 0;
 188         printf("bands %u priomap ", qopt->bands);
 189         for (i=0; i<=TC_PRIO_MAX; i++)
 190                 printf(" %d", qopt->priomap[i]);
 191
 192         if (tb[TCA_PRIO_MQ])
 193                 printf(" multiqueue: o%s ",
 194                     *(unsigned char *)RTA_DATA(tb[TCA_PRIO_MQ]) ? "n" : "ff");
 195
 196         return 0;
 197 }
 198
 199 /* Class Based Queue */
 200 static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 201 {
 202         return 0;
 203 }
 204 static int cbq_print_opt(struct rtattr *opt)
 205 {
 206         struct rtattr *tb[TCA_CBQ_MAX+1];
 207         struct tc_ratespec *r = NULL;
 208         struct tc_cbq_lssopt *lss = NULL;
 209         struct tc_cbq_wrropt *wrr = NULL;
 210         struct tc_cbq_fopt *fopt = NULL;
 211         struct tc_cbq_ovl *ovl = NULL;
 212         const char *const error = "CBQ: too short %s opt";
 213         char buf[64];
 214
 215         if (opt == NULL)
 216                 goto done;
 217         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
 218
 219         if (tb[TCA_CBQ_RATE]) {
 220                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
 221                         bb_error_msg(error, "rate");
 222                 else
 223                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
 224         }
 225         if (tb[TCA_CBQ_LSSOPT]) {
 226                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
 227                         bb_error_msg(error, "lss");
 228                 else
 229                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
 230         }
 231         if (tb[TCA_CBQ_WRROPT]) {
 232                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
 233                         bb_error_msg(error, "wrr");
 234                 else
 235                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
 236         }
 237         if (tb[TCA_CBQ_FOPT]) {
 238                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
 239                         bb_error_msg(error, "fopt");
 240                 else
 241                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
 242         }
 243         if (tb[TCA_CBQ_OVL_STRATEGY]) {
 244                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
 245                         bb_error_msg("CBQ: too short overlimit strategy %u/%u",
 246                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 247                                 (unsigned) sizeof(*ovl));
 248                 else
 249                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 250         }
 251
 252         if (r) {
 253                 print_rate(buf, sizeof(buf), r->rate);
 254                 printf("rate %s ", buf);
 255                 if (show_details) {
 256                         printf("cell %ub ", 1<<r->cell_log);
 257                         if (r->mpu)
 258                                 printf("mpu %ub ", r->mpu);
 259                         if (r->overhead)
 260                                 printf("overhead %ub ", r->overhead);
 261                 }
 262         }
 263         if (lss && lss->flags) {
 264                 bool comma = false;
 265                 bb_putchar('(');
 266                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 267                         printf("bounded");
 268                         comma = true;
 269                 }
 270                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 271                         if (comma)
 272                                 bb_putchar(',');
 273                         printf("isolated");
 274                 }
 275                 printf(") ");
 276         }
 277         if (wrr) {
 278                 if (wrr->priority != TC_CBQ_MAXPRIO)
 279                         printf("prio %u", wrr->priority);
 280                 else
 281                         printf("prio no-transmit");
 282                 if (show_details) {
 283                         printf("/%u ", wrr->cpriority);
 284                         if (wrr->weight != 1) {
 285                                 print_rate(buf, sizeof(buf), wrr->weight);
 286                                 printf("weight %s ", buf);
 287                         }
 288                         if (wrr->allot)
 289                                 printf("allot %ub ", wrr->allot);
 290                 }
 291         }
 292  done:
 293         return 0;
 294 }
 295
 296 static int print_qdisc(const struct sockaddr_nl *who UNUSED_PARAM,
 297                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 298 {
 299         struct tcmsg *msg = NLMSG_DATA(hdr);
 300         int len = hdr->nlmsg_len;
 301         struct rtattr * tb[TCA_MAX+1];
 302         char *name;
 303
 304         if (hdr->nlmsg_type != RTM_NEWQDISC && hdr->nlmsg_type != RTM_DELQDISC) {
 305                 /* bb_error_msg("not a qdisc"); */
 306                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 307         }
 308         len -= NLMSG_LENGTH(sizeof(*msg));
 309         if (len < 0) {
 310                 /* bb_error_msg("wrong len %d", len); */
 311                 return -1;
 312         }
 313         /* not the desired interface? */
 314         if (filter_ifindex && filter_ifindex != msg->tcm_ifindex)
 315                 return 0;
 316         memset (tb, 0, sizeof(tb));
 317         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 318         if (tb[TCA_KIND] == NULL) {
 319                 /* bb_error_msg("%s: NULL kind", "qdisc"); */
 320                 return -1;
 321         }
 322         if (hdr->nlmsg_type == RTM_DELQDISC)
 323                 printf("deleted ");
 324         name = (char*)RTA_DATA(tb[TCA_KIND]);
 325         printf("qdisc %s %x: ", name, msg->tcm_handle>>16);
 326         if (filter_ifindex == 0)
 327                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 328         if (msg->tcm_parent == TC_H_ROOT)
 329                 printf("root ");
 330         else if (msg->tcm_parent) {
 331                 char *classid = print_tc_classid(msg->tcm_parent);
 332                 printf("parent %s ", classid);
 333                 if (ENABLE_FEATURE_CLEAN_UP)
 334                         free(classid);
 335         }
 336         if (msg->tcm_info != 1)
 337                 printf("refcnt %d ", msg->tcm_info);
 338         if (tb[TCA_OPTIONS]) {
 339                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 340                 int qqq = index_in_strings(_q_, name);
 341                 if (qqq == 0) { /* pfifo_fast aka prio */
 342                         prio_print_opt(tb[TCA_OPTIONS]);
 343                 } else if (qqq == 1) { /* class based queuing */
 344                         cbq_print_opt(tb[TCA_OPTIONS]);
 345                 } else
 346                         bb_error_msg("unknown %s", name);
 347         }
 348         bb_putchar('\n');
 349         return 0;
 350 }
 351
 352 static int print_class(const struct sockaddr_nl *who UNUSED_PARAM,
 353                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 354 {
 355         struct tcmsg *msg = NLMSG_DATA(hdr);
 356         int len = hdr->nlmsg_len;
 357         struct rtattr * tb[TCA_MAX+1];
 358         char *name, *classid;
 359
 360         /*XXX Eventually factor out common code */
 361
 362         if (hdr->nlmsg_type != RTM_NEWTCLASS && hdr->nlmsg_type != RTM_DELTCLASS) {
 363                 /* bb_error_msg("not a class"); */
 364                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 365         }
 366         len -= NLMSG_LENGTH(sizeof(*msg));
 367         if (len < 0) {
 368                 /* bb_error_msg("wrong len %d", len); */
 369                 return -1;
 370         }
 371         /* not the desired interface? */
 372         if (filter_qdisc && TC_H_MAJ(msg->tcm_handle^filter_qdisc))
 373                 return 0;
 374         memset (tb, 0, sizeof(tb));
 375         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 376         if (tb[TCA_KIND] == NULL) {
 377                 /* bb_error_msg("%s: NULL kind", "class"); */
 378                 return -1;
 379         }
 380         if (hdr->nlmsg_type == RTM_DELTCLASS)
 381                 printf("deleted ");
 382
 383         name = (char*)RTA_DATA(tb[TCA_KIND]);
 384         classid = !msg->tcm_handle ? NULL : print_tc_classid(
 385                                 filter_qdisc ? TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 386         printf ("class %s %s", name, classid);
 387         if (ENABLE_FEATURE_CLEAN_UP)
 388                 free(classid);
 389
 390         if (filter_ifindex == 0)
 391                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 392         if (msg->tcm_parent == TC_H_ROOT)
 393                 printf("root ");
 394         else if (msg->tcm_parent) {
 395                 classid = print_tc_classid(filter_qdisc ?
 396                                 TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 397                 printf("parent %s ", classid);
 398                 if (ENABLE_FEATURE_CLEAN_UP)
 399                         free(classid);
 400         }
 401         if (msg->tcm_info)
 402                 printf("leaf %x ", msg->tcm_info >> 16);
 403         /* Do that get_qdisc_kind(RTA_DATA(tb[TCA_KIND])).  */
 404         if (tb[TCA_OPTIONS]) {
 405                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 406                 int qqq = index_in_strings(_q_, name);
 407                 if (qqq == 0) { /* pfifo_fast aka prio */
 408                         /* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
 409                 } else if (qqq == 1) { /* class based queuing */
 410                         /* cbq_print_copt() is identical to cbq_print_opt(). */
 411                         cbq_print_opt(tb[TCA_OPTIONS]);
 412                 } else
 413                         bb_error_msg("unknown %s", name);
 414         }
 415         bb_putchar('\n');
 416
 417         return 0;
 418 }
 419
 420 static int print_filter(const struct sockaddr_nl *who UNUSED_PARAM,
 421                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 422 {
 423         return 0;
 424 }
 425
 426 int tc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 427 int tc_main(int argc UNUSED_PARAM, char **argv)
 428 {
 429         static const char objects[] ALIGN1 =
 430                 "qdisc\0""class\0""filter\0"
 431                 ;
 432         enum { OBJ_qdisc = 0, OBJ_class, OBJ_filter };
 433         static const char commands[] ALIGN1 =
 434                 "add\0""delete\0""change\0"
 435                 "link\0" /* only qdisc */
 436                 "replace\0"
 437                 "show\0""list\0"
 438                 ;
 439         static const char args[] ALIGN1 =
 440                 "dev\0" /* qdisc, class, filter */
 441                 "root\0" /* class, filter */
 442                 "parent\0" /* class, filter */
 443                 "qdisc\0" /* class */
 444                 "handle\0" /* change: qdisc, class(classid) list: filter */
 445                 "classid\0" /* change: for class use "handle" */
 446                 "preference\0""priority\0""protocol\0" /* filter */
 447                 ;
 448         enum { CMD_add = 0, CMD_del, CMD_change, CMD_link, CMD_replace, CMD_show };
 449         enum { ARG_dev = 0, ARG_root, ARG_parent, ARG_qdisc,
 450                         ARG_handle, ARG_classid, ARG_pref, ARG_prio, ARG_proto};
 451         struct rtnl_handle rth;
 452         struct tcmsg msg;
 453         int ret, obj, cmd, arg;
 454         char *dev = NULL;
 455
 456         INIT_G();
 457
 458         if (!*++argv)
 459                 bb_show_usage();
 460         xrtnl_open(&rth);
 461         ret = EXIT_SUCCESS;
 462
 463         obj = index_in_substrings(objects, *argv++);
 464
 465         if (obj < 0)
 466                 bb_show_usage();
 467         if (!*argv)
 468                 cmd = CMD_show; /* list is the default */
 469         else {
 470                 cmd = index_in_substrings(commands, *argv);
 471                 if (cmd < 0)
 472                         invarg_1_to_2(*argv, argv[-1]);
 473                 argv++;
 474         }
 475         memset(&msg, 0, sizeof(msg));
 476         msg.tcm_family = AF_UNSPEC;
 477         ll_init_map(&rth);
 478         while (*argv) {
 479                 arg = index_in_substrings(args, *argv);
 480                 if (arg == ARG_dev) {
 481                         NEXT_ARG();
 482                         if (dev)
 483                                 duparg2("dev", *argv);
 484                         dev = *argv++;
 485                         msg.tcm_ifindex = xll_name_to_index(dev);
 486                         if (cmd >= CMD_show)
 487                                 filter_ifindex = msg.tcm_ifindex;
 488                 } else
 489                 if ((arg == ARG_qdisc && obj == OBJ_class && cmd >= CMD_show)
 490                  || (arg == ARG_handle && obj == OBJ_qdisc && cmd == CMD_change)
 491                 ) {
 492                         NEXT_ARG();
 493                         /* We don't care about duparg2("qdisc handle",*argv) for now */
 494                         if (get_qdisc_handle(&filter_qdisc, *argv))
 495                                 invarg_1_to_2(*argv, "qdisc");
 496                 } else
 497                 if (obj != OBJ_qdisc
 498                  && (arg == ARG_root
 499                     || arg == ARG_parent
 500                     || (obj == OBJ_filter && arg >= ARG_pref)
 501                     )
 502                 ) {
 503                         /* nothing */
 504                 } else {
 505                         invarg_1_to_2(*argv, "command");
 506                 }
 507                 NEXT_ARG();
 508                 if (arg == ARG_root) {
 509                         if (msg.tcm_parent)
 510                                 duparg("parent", *argv);
 511                         msg.tcm_parent = TC_H_ROOT;
 512                         if (obj == OBJ_filter)
 513                                 filter_parent = TC_H_ROOT;
 514                 } else if (arg == ARG_parent) {
 515                         uint32_t handle;
 516                         if (msg.tcm_parent)
 517                                 duparg(*argv, "parent");
 518                         if (get_tc_classid(&handle, *argv))
 519                                 invarg_1_to_2(*argv, "parent");
 520                         msg.tcm_parent = handle;
 521                         if (obj == OBJ_filter)
 522                                 filter_parent = handle;
 523                 } else if (arg == ARG_handle) { /* filter::list */
 524                         if (msg.tcm_handle)
 525                                 duparg(*argv, "handle");
 526                         /* reject LONG_MIN || LONG_MAX */
 527                         /* TODO: for fw
 528                         slash = strchr(handle, '/');
 529                         if (slash != NULL)
 530                                    *slash = '\0';
 531                          */
 532                         msg.tcm_handle = get_u32(*argv, "handle");
 533                         /* if (slash) {if (get_u32(uint32_t &mask, slash+1, NULL)) inv mask; addattr32(n, MAX_MSG, TCA_FW_MASK, mask); */
 534                 } else if (arg == ARG_classid && obj == OBJ_class && cmd == CMD_change){
 535                 } else if (arg == ARG_pref || arg == ARG_prio) { /* filter::list */
 536                         if (filter_prio)
 537                                 duparg(*argv, "priority");
 538                         filter_prio = get_u32(*argv, "priority");
 539                 } else if (arg == ARG_proto) { /* filter::list */
 540                         uint16_t tmp;
 541                         if (filter_proto)
 542                                 duparg(*argv, "protocol");
 543                         if (ll_proto_a2n(&tmp, *argv))
 544                                 invarg_1_to_2(*argv, "protocol");
 545                         filter_proto = tmp;
 546                 }
 547         }
 548         if (cmd >= CMD_show) { /* show or list */
 549                 if (obj == OBJ_filter)
 550                         msg.tcm_info = TC_H_MAKE(filter_prio<<16, filter_proto);
 551                 if (rtnl_dump_request(&rth, obj == OBJ_qdisc ? RTM_GETQDISC :
 552                                                 obj == OBJ_class ? RTM_GETTCLASS : RTM_GETTFILTER,
 553                                                 &msg, sizeof(msg)) < 0)
 554                         bb_simple_perror_msg_and_die("can't send dump request");
 555
 556                 xrtnl_dump_filter(&rth, obj == OBJ_qdisc ? print_qdisc :
 557                                                 obj == OBJ_class ? print_class : print_filter,
 558                                                 NULL);
 559         }
 560         if (ENABLE_FEATURE_CLEAN_UP) {
 561                 rtnl_close(&rth);
 562         }
 563         return ret;
 564 }