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 struct BUG_G_too_big {
  68         char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
  69 };
  70 #define filter_ifindex (G.filter_ifindex)
  71 #define filter_qdisc (G.filter_qdisc)
  72 #define filter_parent (G.filter_parent)
  73 #define filter_prio (G.filter_prio)
  74 #define filter_proto (G.filter_proto)
  75 #define INIT_G() do { } while (0)
  76
  77 /* Allocates a buffer containing the name of a class id.
  78  * The caller must free the returned memory.  */
  79 static char* print_tc_classid(uint32_t cid)
  80 {
  81 #if 0 /* IMPOSSIBLE */
  82         if (cid == TC_H_ROOT)
  83                 return xasprintf("root");
  84         else
  85 #endif
  86         if (cid == TC_H_UNSPEC)
  87                 return xasprintf("none");
  88         else if (TC_H_MAJ(cid) == 0)
  89                 return xasprintf(":%x", TC_H_MIN(cid));
  90         else if (TC_H_MIN(cid) == 0)
  91                 return xasprintf("%x:", TC_H_MAJ(cid)>>16);
  92         else
  93                 return xasprintf("%x:%x", TC_H_MAJ(cid)>>16, TC_H_MIN(cid));
  94 }
  95
  96 /* Get a qdisc handle.  Return 0 on success, !0 otherwise.  */
  97 static int get_qdisc_handle(uint32_t *h, const char *str) {
  98         uint32_t maj;
  99         char *p;
 100
 101         maj = TC_H_UNSPEC;
 102         if (!strcmp(str, "none"))
 103                 goto ok;
 104         maj = strtoul(str, &p, 16);
 105         if (p == str)
 106                 return 1;
 107         maj <<= 16;
 108         if (*p != ':' && *p != '\0')
 109                 return 1;
 110  ok:
 111         *h = maj;
 112         return 0;
 113 }
 114
 115 /* Get class ID.  Return 0 on success, !0 otherwise.  */
 116 static int get_tc_classid(uint32_t *h, const char *str) {
 117         uint32_t maj, min;
 118         char *p;
 119
 120         maj = TC_H_ROOT;
 121         if (!strcmp(str, "root"))
 122                 goto ok;
 123         maj = TC_H_UNSPEC;
 124         if (!strcmp(str, "none"))
 125                 goto ok;
 126         maj = strtoul(str, &p, 16);
 127         if (p == str) {
 128                 if (*p != ':')
 129                         return 1;
 130                 maj = 0;
 131         }
 132         if (*p == ':') {
 133                 if (maj >= (1<<16))
 134                         return 1;
 135                 maj <<= 16;
 136                 str = p + 1;
 137                 min = strtoul(str, &p, 16);
 138 //FIXME: check for "" too?
 139                 if (*p != '\0' || min >= (1<<16))
 140                         return 1;
 141                 maj |= min;
 142         } else if (*p != 0)
 143                 return 1;
 144  ok:
 145         *h = maj;
 146         return 0;
 147 }
 148
 149 static void print_rate(char *buf, int len, uint32_t rate)
 150 {
 151         double tmp = (double)rate*8;
 152
 153         if (use_iec) {
 154                 if (tmp >= 1000.0*1024.0*1024.0)
 155                         snprintf(buf, len, "%.0fMibit", tmp/1024.0*1024.0);
 156                 else if (tmp >= 1000.0*1024)
 157                         snprintf(buf, len, "%.0fKibit", tmp/1024);
 158                 else
 159                         snprintf(buf, len, "%.0fbit", tmp);
 160         } else {
 161                 if (tmp >= 1000.0*1000000.0)
 162                         snprintf(buf, len, "%.0fMbit", tmp/1000000.0);
 163                 else if (tmp >= 1000.0 * 1000.0)
 164                         snprintf(buf, len, "%.0fKbit", tmp/1000.0);
 165                 else
 166                         snprintf(buf, len, "%.0fbit",  tmp);
 167         }
 168 }
 169
 170 /* This is "pfifo_fast".  */
 171 static int prio_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 172 {
 173         return 0;
 174 }
 175 static int prio_print_opt(struct rtattr *opt)
 176 {
 177         int i;
 178         struct tc_prio_qopt *qopt;
 179         struct rtattr *tb[TCA_PRIO_MAX+1];
 180
 181         if (opt == NULL)
 182                 return 0;
 183         parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt, sizeof(*qopt));
 184         if (tb == NULL)
 185                 return 0;
 186         printf("bands %u priomap ", qopt->bands);
 187         for (i=0; i<=TC_PRIO_MAX; i++)
 188                 printf(" %d", qopt->priomap[i]);
 189
 190         if (tb[TCA_PRIO_MQ])
 191                 printf(" multiqueue: o%s ",
 192                     *(unsigned char *)RTA_DATA(tb[TCA_PRIO_MQ]) ? "n" : "ff");
 193
 194         return 0;
 195 }
 196
 197 /* Class Based Queue */
 198 static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
 199 {
 200         return 0;
 201 }
 202 static int cbq_print_opt(struct rtattr *opt)
 203 {
 204         struct rtattr *tb[TCA_CBQ_MAX+1];
 205         struct tc_ratespec *r = NULL;
 206         struct tc_cbq_lssopt *lss = NULL;
 207         struct tc_cbq_wrropt *wrr = NULL;
 208         struct tc_cbq_fopt *fopt = NULL;
 209         struct tc_cbq_ovl *ovl = NULL;
 210         const char *const error = "CBQ: too short %s opt";
 211         char buf[64];
 212
 213         if (opt == NULL)
 214                 goto done;
 215         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
 216
 217         if (tb[TCA_CBQ_RATE]) {
 218                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
 219                         bb_error_msg(error, "rate");
 220                 else
 221                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
 222         }
 223         if (tb[TCA_CBQ_LSSOPT]) {
 224                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
 225                         bb_error_msg(error, "lss");
 226                 else
 227                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
 228         }
 229         if (tb[TCA_CBQ_WRROPT]) {
 230                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
 231                         bb_error_msg(error, "wrr");
 232                 else
 233                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
 234         }
 235         if (tb[TCA_CBQ_FOPT]) {
 236                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
 237                         bb_error_msg(error, "fopt");
 238                 else
 239                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
 240         }
 241         if (tb[TCA_CBQ_OVL_STRATEGY]) {
 242                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
 243                         bb_error_msg("CBQ: too short overlimit strategy %u/%u",
 244                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
 245                                 (unsigned) sizeof(*ovl));
 246                 else
 247                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
 248         }
 249
 250         if (r) {
 251                 print_rate(buf, sizeof(buf), r->rate);
 252                 printf("rate %s ", buf);
 253                 if (show_details) {
 254                         printf("cell %ub ", 1<<r->cell_log);
 255                         if (r->mpu)
 256                                 printf("mpu %ub ", r->mpu);
 257                         if (r->overhead)
 258                                 printf("overhead %ub ", r->overhead);
 259                 }
 260         }
 261         if (lss && lss->flags) {
 262                 bool comma = false;
 263                 bb_putchar('(');
 264                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
 265                         printf("bounded");
 266                         comma = true;
 267                 }
 268                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
 269                         if (comma)
 270                                 bb_putchar(',');
 271                         printf("isolated");
 272                 }
 273                 printf(") ");
 274         }
 275         if (wrr) {
 276                 if (wrr->priority != TC_CBQ_MAXPRIO)
 277                         printf("prio %u", wrr->priority);
 278                 else
 279                         printf("prio no-transmit");
 280                 if (show_details) {
 281                         printf("/%u ", wrr->cpriority);
 282                         if (wrr->weight != 1) {
 283                                 print_rate(buf, sizeof(buf), wrr->weight);
 284                                 printf("weight %s ", buf);
 285                         }
 286                         if (wrr->allot)
 287                                 printf("allot %ub ", wrr->allot);
 288                 }
 289         }
 290  done:
 291         return 0;
 292 }
 293
 294 static int print_qdisc(const struct sockaddr_nl *who UNUSED_PARAM,
 295                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 296 {
 297         struct tcmsg *msg = NLMSG_DATA(hdr);
 298         int len = hdr->nlmsg_len;
 299         struct rtattr * tb[TCA_MAX+1];
 300         char *name;
 301
 302         if (hdr->nlmsg_type != RTM_NEWQDISC && hdr->nlmsg_type != RTM_DELQDISC) {
 303                 /* bb_error_msg("not a qdisc"); */
 304                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 305         }
 306         len -= NLMSG_LENGTH(sizeof(*msg));
 307         if (len < 0) {
 308                 /* bb_error_msg("wrong len %d", len); */
 309                 return -1;
 310         }
 311         /* not the desired interface? */
 312         if (filter_ifindex && filter_ifindex != msg->tcm_ifindex)
 313                 return 0;
 314         memset (tb, 0, sizeof(tb));
 315         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 316         if (tb[TCA_KIND] == NULL) {
 317                 /* bb_error_msg("%s: NULL kind", "qdisc"); */
 318                 return -1;
 319         }
 320         if (hdr->nlmsg_type == RTM_DELQDISC)
 321                 printf("deleted ");
 322         name = (char*)RTA_DATA(tb[TCA_KIND]);
 323         printf("qdisc %s %x: ", name, msg->tcm_handle>>16);
 324         if (filter_ifindex == 0)
 325                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 326         if (msg->tcm_parent == TC_H_ROOT)
 327                 printf("root ");
 328         else if (msg->tcm_parent) {
 329                 char *classid = print_tc_classid(msg->tcm_parent);
 330                 printf("parent %s ", classid);
 331                 if (ENABLE_FEATURE_CLEAN_UP)
 332                         free(classid);
 333         }
 334         if (msg->tcm_info != 1)
 335                 printf("refcnt %d ", msg->tcm_info);
 336         if (tb[TCA_OPTIONS]) {
 337                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 338                 int qqq = index_in_strings(_q_, name);
 339                 if (qqq == 0) { /* pfifo_fast aka prio */
 340                         prio_print_opt(tb[TCA_OPTIONS]);
 341                 } else if (qqq == 1) { /* class based queuing */
 342                         cbq_print_opt(tb[TCA_OPTIONS]);
 343                 } else
 344                         bb_error_msg("unknown %s", name);
 345         }
 346         bb_putchar('\n');
 347         return 0;
 348 }
 349
 350 static int print_class(const struct sockaddr_nl *who UNUSED_PARAM,
 351                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 352 {
 353         struct tcmsg *msg = NLMSG_DATA(hdr);
 354         int len = hdr->nlmsg_len;
 355         struct rtattr * tb[TCA_MAX+1];
 356         char *name, *classid;
 357
 358         /*XXX Eventually factor out common code */
 359
 360         if (hdr->nlmsg_type != RTM_NEWTCLASS && hdr->nlmsg_type != RTM_DELTCLASS) {
 361                 /* bb_error_msg("not a class"); */
 362                 return 0; /* ??? mimic upstream; should perhaps return -1 */
 363         }
 364         len -= NLMSG_LENGTH(sizeof(*msg));
 365         if (len < 0) {
 366                 /* bb_error_msg("wrong len %d", len); */
 367                 return -1;
 368         }
 369         /* not the desired interface? */
 370         if (filter_qdisc && TC_H_MAJ(msg->tcm_handle^filter_qdisc))
 371                 return 0;
 372         memset (tb, 0, sizeof(tb));
 373         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
 374         if (tb[TCA_KIND] == NULL) {
 375                 /* bb_error_msg("%s: NULL kind", "class"); */
 376                 return -1;
 377         }
 378         if (hdr->nlmsg_type == RTM_DELTCLASS)
 379                 printf("deleted ");
 380
 381         name = (char*)RTA_DATA(tb[TCA_KIND]);
 382         classid = !msg->tcm_handle ? NULL : print_tc_classid(
 383                                 filter_qdisc ? TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 384         printf ("class %s %s", name, classid);
 385         if (ENABLE_FEATURE_CLEAN_UP)
 386                 free(classid);
 387
 388         if (filter_ifindex == 0)
 389                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
 390         if (msg->tcm_parent == TC_H_ROOT)
 391                 printf("root ");
 392         else if (msg->tcm_parent) {
 393                 classid = print_tc_classid(filter_qdisc ?
 394                                 TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
 395                 printf("parent %s ", classid);
 396                 if (ENABLE_FEATURE_CLEAN_UP)
 397                         free(classid);
 398         }
 399         if (msg->tcm_info)
 400                 printf("leaf %x ", msg->tcm_info >> 16);
 401         /* Do that get_qdisc_kind(RTA_DATA(tb[TCA_KIND])).  */
 402         if (tb[TCA_OPTIONS]) {
 403                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
 404                 int qqq = index_in_strings(_q_, name);
 405                 if (qqq == 0) { /* pfifo_fast aka prio */
 406                         /* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
 407                 } else if (qqq == 1) { /* class based queuing */
 408                         /* cbq_print_copt() is identical to cbq_print_opt(). */
 409                         cbq_print_opt(tb[TCA_OPTIONS]);
 410                 } else
 411                         bb_error_msg("unknown %s", name);
 412         }
 413         bb_putchar('\n');
 414
 415         return 0;
 416 }
 417
 418 static int print_filter(const struct sockaddr_nl *who UNUSED_PARAM,
 419                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
 420 {
 421         return 0;
 422 }
 423
 424 int tc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 425 int tc_main(int argc UNUSED_PARAM, char **argv)
 426 {
 427         static const char objects[] ALIGN1 =
 428                 "qdisc\0""class\0""filter\0"
 429                 ;
 430         enum { OBJ_qdisc = 0, OBJ_class, OBJ_filter };
 431         static const char commands[] ALIGN1 =
 432                 "add\0""delete\0""change\0"
 433                 "link\0" /* only qdisc */
 434                 "replace\0"
 435                 "show\0""list\0"
 436                 ;
 437         static const char args[] ALIGN1 =
 438                 "dev\0" /* qdisc, class, filter */
 439                 "root\0" /* class, filter */
 440                 "parent\0" /* class, filter */
 441                 "qdisc\0" /* class */
 442                 "handle\0" /* change: qdisc, class(classid) list: filter */
 443                 "classid\0" /* change: for class use "handle" */
 444                 "preference\0""priority\0""protocol\0" /* filter */
 445                 ;
 446         enum { CMD_add = 0, CMD_del, CMD_change, CMD_link, CMD_replace, CMD_show };
 447         enum { ARG_dev = 0, ARG_root, ARG_parent, ARG_qdisc,
 448                         ARG_handle, ARG_classid, ARG_pref, ARG_prio, ARG_proto};
 449         struct rtnl_handle rth;
 450         struct tcmsg msg;
 451         int ret, obj, cmd, arg;
 452         char *dev = NULL;
 453
 454         INIT_G();
 455
 456         if (!*++argv)
 457                 bb_show_usage();
 458         xrtnl_open(&rth);
 459         ret = EXIT_SUCCESS;
 460
 461         obj = index_in_substrings(objects, *argv++);
 462
 463         if (obj < OBJ_qdisc)
 464                 bb_show_usage();
 465         if (!*argv)
 466                 cmd = CMD_show; /* list is the default */
 467         else {
 468                 cmd = index_in_substrings(commands, *argv);
 469                 if (cmd < 0)
 470                         bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
 471                 argv++;
 472         }
 473         memset(&msg, 0, sizeof(msg));
 474         msg.tcm_family = AF_UNSPEC;
 475         ll_init_map(&rth);
 476         while (*argv) {
 477                 arg = index_in_substrings(args, *argv);
 478                 if (arg == ARG_dev) {
 479                         NEXT_ARG();
 480                         if (dev)
 481                                 duparg2("dev", *argv);
 482                         dev = *argv++;
 483                         msg.tcm_ifindex = xll_name_to_index(dev);
 484                         if (cmd >= CMD_show)
 485                                 filter_ifindex = msg.tcm_ifindex;
 486                 } else
 487                 if ((arg == ARG_qdisc && obj == OBJ_class && cmd >= CMD_show)
 488                  || (arg == ARG_handle && obj == OBJ_qdisc && cmd == CMD_change)
 489                 ) {
 490                         NEXT_ARG();
 491                         /* We don't care about duparg2("qdisc handle",*argv) for now */
 492                         if (get_qdisc_handle(&filter_qdisc, *argv))
 493                                 invarg(*argv, "qdisc");
 494                 } else
 495                 if (obj != OBJ_qdisc
 496                  && (arg == ARG_root
 497                     || arg == ARG_parent
 498                     || (obj == OBJ_filter && arg >= ARG_pref)
 499                     )
 500                 ) {
 501                         /* nothing */
 502                 } else {
 503                         invarg(*argv, "command");
 504                 }
 505                 NEXT_ARG();
 506                 if (arg == ARG_root) {
 507                         if (msg.tcm_parent)
 508                                 duparg("parent", *argv);
 509                         msg.tcm_parent = TC_H_ROOT;
 510                         if (obj == OBJ_filter)
 511                                 filter_parent = TC_H_ROOT;
 512                 } else if (arg == ARG_parent) {
 513                         uint32_t handle;
 514                         if (msg.tcm_parent)
 515                                 duparg(*argv, "parent");
 516                         if (get_tc_classid(&handle, *argv))
 517                                 invarg(*argv, "parent");
 518                         msg.tcm_parent = handle;
 519                         if (obj == OBJ_filter)
 520                                 filter_parent = handle;
 521                 } else if (arg == ARG_handle) { /* filter::list */
 522                         if (msg.tcm_handle)
 523                                 duparg(*argv, "handle");
 524                         /* reject LONG_MIN || LONG_MAX */
 525                         /* TODO: for fw
 526                         slash = strchr(handle, '/');
 527                         if (slash != NULL)
 528                                    *slash = '\0';
 529                          */
 530                         msg.tcm_handle = get_u32(*argv, "handle");
 531                         /* if (slash) {if (get_u32(uint32_t &mask, slash+1, NULL)) inv mask; addattr32(n, MAX_MSG, TCA_FW_MASK, mask); */
 532                 } else if (arg == ARG_classid && obj == OBJ_class && cmd == CMD_change){
 533                 } else if (arg == ARG_pref || arg == ARG_prio) { /* filter::list */
 534                         if (filter_prio)
 535                                 duparg(*argv, "priority");
 536                         filter_prio = get_u32(*argv, "priority");
 537                 } else if (arg == ARG_proto) { /* filter::list */
 538                         uint16_t tmp;
 539                         if (filter_proto)
 540                                 duparg(*argv, "protocol");
 541                         if (ll_proto_a2n(&tmp, *argv))
 542                                 invarg(*argv, "protocol");
 543                         filter_proto = tmp;
 544                 }
 545         }
 546         if (cmd >= CMD_show) { /* show or list */
 547                 if (obj == OBJ_filter)
 548                         msg.tcm_info = TC_H_MAKE(filter_prio<<16, filter_proto);
 549                 if (rtnl_dump_request(&rth, obj == OBJ_qdisc ? RTM_GETQDISC :
 550                                                 obj == OBJ_class ? RTM_GETTCLASS : RTM_GETTFILTER,
 551                                                 &msg, sizeof(msg)) < 0)
 552                         bb_simple_perror_msg_and_die("can't send dump request");
 553
 554                 xrtnl_dump_filter(&rth, obj == OBJ_qdisc ? print_qdisc :
 555                                                 obj == OBJ_class ? print_class : print_filter,
 556                                                 NULL);
 557         }
 558         if (ENABLE_FEATURE_CLEAN_UP) {
 559                 rtnl_close(&rth);
 560         }
 561         return ret;
 562 }