tc/tc_filter.c

   1 /*
   2  * tc_filter.c          "tc filter".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22 #include <linux/if_ether.h>
  23
  24 #include "rt_names.h"
  25 #include "utils.h"
  26 #include "tc_util.h"
  27 #include "tc_common.h"
  28
  29 static void usage(void)
  30 {
  31         fprintf(stderr,
  32                 "Usage: tc filter [ add | del | change | replace | show ] dev STRING\n"
  33                 "Usage: tc filter get dev STRING parent CLASSID protocol PROTO handle FILTERID pref PRIO FILTER_TYPE\n"
  34                 "       [ pref PRIO ] protocol PROTO [ chain CHAIN_INDEX ]\n"
  35                 "       [ estimator INTERVAL TIME_CONSTANT ]\n"
  36                 "       [ root | ingress | egress | parent CLASSID ]\n"
  37                 "       [ handle FILTERID ] [ [ FILTER_TYPE ] [ help | OPTIONS ] ]\n"
  38                 "\n"
  39                 "       tc filter show [ dev STRING ] [ root | ingress | egress | parent CLASSID ]\n"
  40                 "Where:\n"
  41                 "FILTER_TYPE := { rsvp | u32 | bpf | fw | route | etc. }\n"
  42                 "FILTERID := ... format depends on classifier, see there\n"
  43                 "OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
  44 }
  45
  46 static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
  47 {
  48         struct {
  49                 struct nlmsghdr n;
  50                 struct tcmsg            t;
  51                 char                    buf[MAX_MSG];
  52         } req = {
  53                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
  54                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
  55                 .n.nlmsg_type = cmd,
  56                 .t.tcm_family = AF_UNSPEC,
  57         };
  58         struct filter_util *q = NULL;
  59         __u32 prio = 0;
  60         __u32 protocol = 0;
  61         int protocol_set = 0;
  62         __u32 chain_index;
  63         int chain_index_set = 0;
  64         char *fhandle = NULL;
  65         char  d[16] = {};
  66         char  k[16] = {};
  67         struct tc_estimator est = {};
  68
  69         if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
  70                 protocol = htons(ETH_P_ALL);
  71
  72         while (argc > 0) {
  73                 if (strcmp(*argv, "dev") == 0) {
  74                         NEXT_ARG();
  75                         if (d[0])
  76                                 duparg("dev", *argv);
  77                         strncpy(d, *argv, sizeof(d)-1);
  78                 } else if (strcmp(*argv, "root") == 0) {
  79                         if (req.t.tcm_parent) {
  80                                 fprintf(stderr,
  81                                         "Error: \"root\" is duplicate parent ID\n");
  82                                 return -1;
  83                         }
  84                         req.t.tcm_parent = TC_H_ROOT;
  85                 } else if (strcmp(*argv, "ingress") == 0) {
  86                         if (req.t.tcm_parent) {
  87                                 fprintf(stderr,
  88                                         "Error: \"ingress\" is duplicate parent ID\n");
  89                                 return -1;
  90                         }
  91                         req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
  92                                                      TC_H_MIN_INGRESS);
  93                 } else if (strcmp(*argv, "egress") == 0) {
  94                         if (req.t.tcm_parent) {
  95                                 fprintf(stderr,
  96                                         "Error: \"egress\" is duplicate parent ID\n");
  97                                 return -1;
  98                         }
  99                         req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
 100                                                      TC_H_MIN_EGRESS);
 101                 } else if (strcmp(*argv, "parent") == 0) {
 102                         __u32 handle;
 103
 104                         NEXT_ARG();
 105                         if (req.t.tcm_parent)
 106                                 duparg("parent", *argv);
 107                         if (get_tc_classid(&handle, *argv))
 108                                 invarg("Invalid parent ID", *argv);
 109                         req.t.tcm_parent = handle;
 110                 } else if (strcmp(*argv, "handle") == 0) {
 111                         NEXT_ARG();
 112                         if (fhandle)
 113                                 duparg("handle", *argv);
 114                         fhandle = *argv;
 115                 } else if (matches(*argv, "preference") == 0 ||
 116                            matches(*argv, "priority") == 0) {
 117                         NEXT_ARG();
 118                         if (prio)
 119                                 duparg("priority", *argv);
 120                         if (get_u32(&prio, *argv, 0) || prio > 0xFFFF)
 121                                 invarg("invalid priority value", *argv);
 122                 } else if (matches(*argv, "protocol") == 0) {
 123                         __u16 id;
 124
 125                         NEXT_ARG();
 126                         if (protocol_set)
 127                                 duparg("protocol", *argv);
 128                         if (ll_proto_a2n(&id, *argv))
 129                                 invarg("invalid protocol", *argv);
 130                         protocol = id;
 131                         protocol_set = 1;
 132                 } else if (matches(*argv, "chain") == 0) {
 133                         NEXT_ARG();
 134                         if (chain_index_set)
 135                                 duparg("chain", *argv);
 136                         if (get_u32(&chain_index, *argv, 0))
 137                                 invarg("invalid chain index value", *argv);
 138                         chain_index_set = 1;
 139                 } else if (matches(*argv, "estimator") == 0) {
 140                         if (parse_estimator(&argc, &argv, &est) < 0)
 141                                 return -1;
 142                 } else if (matches(*argv, "help") == 0) {
 143                         usage();
 144                         return 0;
 145                 } else {
 146                         strncpy(k, *argv, sizeof(k)-1);
 147
 148                         q = get_filter_kind(k);
 149                         argc--; argv++;
 150                         break;
 151                 }
 152
 153                 argc--; argv++;
 154         }
 155
 156         req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 157
 158         if (chain_index_set)
 159                 addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
 160
 161         if (k[0])
 162                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 163
 164         if (q) {
 165                 if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
 166                         return 1;
 167         } else {
 168                 if (fhandle) {
 169                         fprintf(stderr,
 170                                 "Must specify filter type when using \"handle\"\n");
 171                         return -1;
 172                 }
 173                 if (argc) {
 174                         if (matches(*argv, "help") == 0)
 175                                 usage();
 176                         fprintf(stderr,
 177                                 "Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n",
 178                                 *argv);
 179                         return -1;
 180                 }
 181         }
 182
 183         if (est.ewma_log)
 184                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 185
 186
 187         if (d[0])  {
 188                 ll_init_map(&rth);
 189
 190                 req.t.tcm_ifindex = ll_name_to_index(d);
 191                 if (req.t.tcm_ifindex == 0) {
 192                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 193                         return 1;
 194                 }
 195         }
 196
 197         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0) {
 198                 fprintf(stderr, "We have an error talking to the kernel\n");
 199                 return 2;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static __u32 filter_parent;
 206 static int filter_ifindex;
 207 static __u32 filter_prio;
 208 static __u32 filter_protocol;
 209 static __u32 filter_chain_index;
 210 static int filter_chain_index_set;
 211 __u16 f_proto;
 212
 213 int print_filter(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 214 {
 215         FILE *fp = (FILE *)arg;
 216         struct tcmsg *t = NLMSG_DATA(n);
 217         int len = n->nlmsg_len;
 218         struct rtattr *tb[TCA_MAX+1];
 219         struct filter_util *q;
 220         char abuf[256];
 221
 222         if (n->nlmsg_type != RTM_NEWTFILTER &&
 223             n->nlmsg_type != RTM_GETTFILTER &&
 224             n->nlmsg_type != RTM_DELTFILTER) {
 225                 fprintf(stderr, "Not a filter(cmd %d)\n", n->nlmsg_type);
 226                 return 0;
 227         }
 228         len -= NLMSG_LENGTH(sizeof(*t));
 229         if (len < 0) {
 230                 fprintf(stderr, "Wrong len %d\n", len);
 231                 return -1;
 232         }
 233
 234         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 235
 236         if (tb[TCA_KIND] == NULL) {
 237                 fprintf(stderr, "print_filter: NULL kind\n");
 238                 return -1;
 239         }
 240
 241         if (n->nlmsg_type == RTM_DELTFILTER)
 242                 fprintf(fp, "deleted ");
 243
 244         if (n->nlmsg_type == RTM_NEWTFILTER &&
 245                         (n->nlmsg_flags & NLM_F_CREATE) &&
 246                         !(n->nlmsg_flags & NLM_F_EXCL))
 247                 fprintf(fp, "replaced ");
 248
 249         if (n->nlmsg_type == RTM_NEWTFILTER &&
 250                         (n->nlmsg_flags & NLM_F_CREATE) &&
 251                         (n->nlmsg_flags & NLM_F_EXCL))
 252                 fprintf(fp, "added ");
 253
 254         fprintf(fp, "filter ");
 255         if (!filter_ifindex || filter_ifindex != t->tcm_ifindex)
 256                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 257
 258         if (!filter_parent || filter_parent != t->tcm_parent) {
 259                 if (t->tcm_parent == TC_H_ROOT)
 260                         fprintf(fp, "root ");
 261                 else if (t->tcm_parent == TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS))
 262                         fprintf(fp, "ingress ");
 263                 else if (t->tcm_parent == TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_EGRESS))
 264                         fprintf(fp, "egress ");
 265                 else {
 266                         print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 267                         fprintf(fp, "parent %s ", abuf);
 268                 }
 269         }
 270
 271         if (t->tcm_info) {
 272                 f_proto = TC_H_MIN(t->tcm_info);
 273                 __u32 prio = TC_H_MAJ(t->tcm_info)>>16;
 274
 275                 if (!filter_protocol || filter_protocol != f_proto) {
 276                         if (f_proto) {
 277                                 SPRINT_BUF(b1);
 278                                 fprintf(fp, "protocol %s ",
 279                                         ll_proto_n2a(f_proto, b1, sizeof(b1)));
 280                         }
 281                 }
 282                 if (!filter_prio || filter_prio != prio) {
 283                         if (prio)
 284                                 fprintf(fp, "pref %u ", prio);
 285                 }
 286         }
 287         fprintf(fp, "%s ", rta_getattr_str(tb[TCA_KIND]));
 288
 289         if (tb[TCA_CHAIN]) {
 290                 __u32 chain_index = rta_getattr_u32(tb[TCA_CHAIN]);
 291
 292                 if (!filter_chain_index_set ||
 293                     filter_chain_index != chain_index)
 294                         fprintf(fp, "chain %u ", chain_index);
 295         }
 296
 297         q = get_filter_kind(RTA_DATA(tb[TCA_KIND]));
 298         if (tb[TCA_OPTIONS]) {
 299                 if (q)
 300                         q->print_fopt(q, fp, tb[TCA_OPTIONS], t->tcm_handle);
 301                 else
 302                         fprintf(fp, "[cannot parse parameters]");
 303         }
 304         fprintf(fp, "\n");
 305
 306         if (show_stats && (tb[TCA_STATS] || tb[TCA_STATS2])) {
 307                 print_tcstats_attr(fp, tb, " ", NULL);
 308                 fprintf(fp, "\n");
 309         }
 310
 311         fflush(fp);
 312         return 0;
 313 }
 314
 315 static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
 316 {
 317         struct {
 318                 struct nlmsghdr n;
 319                 struct tcmsg            t;
 320                 char                    buf[MAX_MSG];
 321         } req = {
 322                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
 323                 /* NLM_F_ECHO is for backward compatibility. old kernels never
 324                  * respond without it and newer kernels will ignore it.
 325                  * In old kernels there is a side effect:
 326                  * In addition to a response to the GET you will receive an
 327                  * event (if you do tc mon).
 328                  */
 329                 .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ECHO | flags,
 330                 .n.nlmsg_type = cmd,
 331                 .t.tcm_parent = TC_H_UNSPEC,
 332                 .t.tcm_family = AF_UNSPEC,
 333         };
 334         struct filter_util *q = NULL;
 335         __u32 prio = 0;
 336         __u32 protocol = 0;
 337         int protocol_set = 0;
 338         __u32 chain_index;
 339         int chain_index_set = 0;
 340         __u32 parent_handle = 0;
 341         char *fhandle = NULL;
 342         char  d[16] = {};
 343         char  k[16] = {};
 344
 345         while (argc > 0) {
 346                 if (strcmp(*argv, "dev") == 0) {
 347                         NEXT_ARG();
 348                         if (d[0])
 349                                 duparg("dev", *argv);
 350                         strncpy(d, *argv, sizeof(d)-1);
 351                 } else if (strcmp(*argv, "root") == 0) {
 352                         if (req.t.tcm_parent) {
 353                                 fprintf(stderr,
 354                                         "Error: \"root\" is duplicate parent ID\n");
 355                                 return -1;
 356                         }
 357                         req.t.tcm_parent = TC_H_ROOT;
 358                 } else if (strcmp(*argv, "ingress") == 0) {
 359                         if (req.t.tcm_parent) {
 360                                 fprintf(stderr,
 361                                         "Error: \"ingress\" is duplicate parent ID\n");
 362                                 return -1;
 363                         }
 364                         req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
 365                                                      TC_H_MIN_INGRESS);
 366                 } else if (strcmp(*argv, "egress") == 0) {
 367                         if (req.t.tcm_parent) {
 368                                 fprintf(stderr,
 369                                         "Error: \"egress\" is duplicate parent ID\n");
 370                                 return -1;
 371                         }
 372                         req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
 373                                                      TC_H_MIN_EGRESS);
 374                 } else if (strcmp(*argv, "parent") == 0) {
 375
 376                         NEXT_ARG();
 377                         if (req.t.tcm_parent)
 378                                 duparg("parent", *argv);
 379                         if (get_tc_classid(&parent_handle, *argv))
 380                                 invarg("Invalid parent ID", *argv);
 381                         req.t.tcm_parent = parent_handle;
 382                 } else if (strcmp(*argv, "handle") == 0) {
 383                         NEXT_ARG();
 384                         if (fhandle)
 385                                 duparg("handle", *argv);
 386                         fhandle = *argv;
 387                 } else if (matches(*argv, "preference") == 0 ||
 388                            matches(*argv, "priority") == 0) {
 389                         NEXT_ARG();
 390                         if (prio)
 391                                 duparg("priority", *argv);
 392                         if (get_u32(&prio, *argv, 0) || prio > 0xFFFF)
 393                                 invarg("invalid priority value", *argv);
 394                 } else if (matches(*argv, "protocol") == 0) {
 395                         __u16 id;
 396
 397                         NEXT_ARG();
 398                         if (protocol_set)
 399                                 duparg("protocol", *argv);
 400                         if (ll_proto_a2n(&id, *argv))
 401                                 invarg("invalid protocol", *argv);
 402                         protocol = id;
 403                         protocol_set = 1;
 404                 } else if (matches(*argv, "chain") == 0) {
 405                         NEXT_ARG();
 406                         if (chain_index_set)
 407                                 duparg("chain", *argv);
 408                         if (get_u32(&chain_index, *argv, 0))
 409                                 invarg("invalid chain index value", *argv);
 410                         chain_index_set = 1;
 411                 } else if (matches(*argv, "help") == 0) {
 412                         usage();
 413                         return 0;
 414                 } else {
 415                         strncpy(k, *argv, sizeof(k)-1);
 416
 417                         q = get_filter_kind(k);
 418                         argc--; argv++;
 419                         break;
 420                 }
 421
 422                 argc--; argv++;
 423         }
 424
 425         if (!protocol_set) {
 426                 fprintf(stderr, "Must specify filter protocol\n");
 427                 return -1;
 428         }
 429
 430         if (!prio) {
 431                 fprintf(stderr, "Must specify filter priority\n");
 432                 return -1;
 433         }
 434
 435         req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 436
 437         if (chain_index_set)
 438                 addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
 439
 440         if (req.t.tcm_parent == TC_H_UNSPEC) {
 441                 fprintf(stderr, "Must specify filter parent\n");
 442                 return -1;
 443         }
 444
 445         if (k[0])
 446                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 447         else {
 448                 fprintf(stderr, "Must specify filter type\n");
 449                 return -1;
 450         }
 451
 452         if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
 453                 return 1;
 454
 455
 456         if (!fhandle) {
 457                 fprintf(stderr, "Must specify filter \"handle\"\n");
 458                 return -1;
 459         }
 460
 461         if (argc) {
 462                 if (matches(*argv, "help") == 0)
 463                         usage();
 464                 fprintf(stderr,
 465                         "Garbage instead of arguments \"%s ...\". Try \"tc filter help\".\n",
 466                         *argv);
 467                 return -1;
 468         }
 469
 470         if (d[0])  {
 471                 ll_init_map(&rth);
 472
 473                 req.t.tcm_ifindex = ll_name_to_index(d);
 474                 if (req.t.tcm_ifindex  == 0) {
 475                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 476                         return 1;
 477                 }
 478                 filter_ifindex = req.t.tcm_ifindex;
 479         } else {
 480                 fprintf(stderr, "Must specify netdevice \"dev\"\n");
 481                 return -1;
 482         }
 483
 484         if (rtnl_talk(&rth, &req.n, &req.n, MAX_MSG) < 0) {
 485                 fprintf(stderr, "We have an error talking to the kernel\n");
 486                 return 2;
 487         }
 488
 489         print_filter(NULL, &req.n, (void *)stdout);
 490
 491         return 0;
 492 }
 493
 494 static int tc_filter_list(int argc, char **argv)
 495 {
 496         struct {
 497                 struct nlmsghdr n;
 498                 struct tcmsg t;
 499                 char buf[MAX_MSG];
 500         } req = {
 501                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
 502                 .n.nlmsg_type = RTM_GETTFILTER,
 503                 .t.tcm_parent = TC_H_UNSPEC,
 504                 .t.tcm_family = AF_UNSPEC,
 505         };
 506         char d[16] = {};
 507         __u32 prio = 0;
 508         __u32 protocol = 0;
 509         __u32 chain_index;
 510         char *fhandle = NULL;
 511
 512         while (argc > 0) {
 513                 if (strcmp(*argv, "dev") == 0) {
 514                         NEXT_ARG();
 515                         if (d[0])
 516                                 duparg("dev", *argv);
 517                         strncpy(d, *argv, sizeof(d)-1);
 518                 } else if (strcmp(*argv, "root") == 0) {
 519                         if (req.t.tcm_parent) {
 520                                 fprintf(stderr,
 521                                         "Error: \"root\" is duplicate parent ID\n");
 522                                 return -1;
 523                         }
 524                         filter_parent = req.t.tcm_parent = TC_H_ROOT;
 525                 } else if (strcmp(*argv, "ingress") == 0) {
 526                         if (req.t.tcm_parent) {
 527                                 fprintf(stderr,
 528                                         "Error: \"ingress\" is duplicate parent ID\n");
 529                                 return -1;
 530                         }
 531                         filter_parent = TC_H_MAKE(TC_H_CLSACT,
 532                                                   TC_H_MIN_INGRESS);
 533                         req.t.tcm_parent = filter_parent;
 534                 } else if (strcmp(*argv, "egress") == 0) {
 535                         if (req.t.tcm_parent) {
 536                                 fprintf(stderr,
 537                                         "Error: \"egress\" is duplicate parent ID\n");
 538                                 return -1;
 539                         }
 540                         filter_parent = TC_H_MAKE(TC_H_CLSACT,
 541                                                   TC_H_MIN_EGRESS);
 542                         req.t.tcm_parent = filter_parent;
 543                 } else if (strcmp(*argv, "parent") == 0) {
 544                         __u32 handle;
 545
 546                         NEXT_ARG();
 547                         if (req.t.tcm_parent)
 548                                 duparg("parent", *argv);
 549                         if (get_tc_classid(&handle, *argv))
 550                                 invarg("invalid parent ID", *argv);
 551                         filter_parent = req.t.tcm_parent = handle;
 552                 } else if (strcmp(*argv, "handle") == 0) {
 553                         NEXT_ARG();
 554                         if (fhandle)
 555                                 duparg("handle", *argv);
 556                         fhandle = *argv;
 557                 } else if (matches(*argv, "preference") == 0 ||
 558                            matches(*argv, "priority") == 0) {
 559                         NEXT_ARG();
 560                         if (prio)
 561                                 duparg("priority", *argv);
 562                         if (get_u32(&prio, *argv, 0))
 563                                 invarg("invalid preference", *argv);
 564                         filter_prio = prio;
 565                 } else if (matches(*argv, "protocol") == 0) {
 566                         __u16 res;
 567
 568                         NEXT_ARG();
 569                         if (protocol)
 570                                 duparg("protocol", *argv);
 571                         if (ll_proto_a2n(&res, *argv))
 572                                 invarg("invalid protocol", *argv);
 573                         protocol = res;
 574                         filter_protocol = protocol;
 575                 } else if (matches(*argv, "chain") == 0) {
 576                         NEXT_ARG();
 577                         if (filter_chain_index_set)
 578                                 duparg("chain", *argv);
 579                         if (get_u32(&chain_index, *argv, 0))
 580                                 invarg("invalid chain index value", *argv);
 581                         filter_chain_index_set = 1;
 582                         filter_chain_index = chain_index;
 583                 } else if (matches(*argv, "help") == 0) {
 584                         usage();
 585                 } else {
 586                         fprintf(stderr,
 587                                 " What is \"%s\"? Try \"tc filter help\"\n",
 588                                 *argv);
 589                         return -1;
 590                 }
 591
 592                 argc--; argv++;
 593         }
 594
 595         req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 596
 597         ll_init_map(&rth);
 598
 599         if (d[0]) {
 600                 req.t.tcm_ifindex = ll_name_to_index(d);
 601                 if (req.t.tcm_ifindex == 0) {
 602                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 603                         return 1;
 604                 }
 605                 filter_ifindex = req.t.tcm_ifindex;
 606         }
 607
 608         if (filter_chain_index_set)
 609                 addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
 610
 611         if (rtnl_dump_request_n(&rth, &req.n) < 0) {
 612                 perror("Cannot send dump request");
 613                 return 1;
 614         }
 615
 616         if (rtnl_dump_filter(&rth, print_filter, stdout) < 0) {
 617                 fprintf(stderr, "Dump terminated\n");
 618                 return 1;
 619         }
 620
 621         return 0;
 622 }
 623
 624 int do_filter(int argc, char **argv)
 625 {
 626         if (argc < 1)
 627                 return tc_filter_list(0, NULL);
 628         if (matches(*argv, "add") == 0)
 629                 return tc_filter_modify(RTM_NEWTFILTER, NLM_F_EXCL|NLM_F_CREATE,
 630                                         argc-1, argv+1);
 631         if (matches(*argv, "change") == 0)
 632                 return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1);
 633         if (matches(*argv, "replace") == 0)
 634                 return tc_filter_modify(RTM_NEWTFILTER, NLM_F_CREATE, argc-1,
 635                                         argv+1);
 636         if (matches(*argv, "delete") == 0)
 637                 return tc_filter_modify(RTM_DELTFILTER, 0,  argc-1, argv+1);
 638         if (matches(*argv, "get") == 0)
 639                 return tc_filter_get(RTM_GETTFILTER, 0,  argc-1, argv+1);
 640         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 641             || matches(*argv, "lst") == 0)
 642                 return tc_filter_list(argc-1, argv+1);
 643         if (matches(*argv, "help") == 0) {
 644                 usage();
 645                 return 0;
 646         }
 647         fprintf(stderr, "Command \"%s\" is unknown, try \"tc filter help\".\n",
 648                 *argv);
 649         return -1;
 650 }