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