tc/tc_qdisc.c

   1 /*
   2  * tc_qdisc.c           "tc qdisc".
   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  *              J Hadi Salim: Extension to ingress
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21 #include <math.h>
  22 #include <malloc.h>
  23
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include "tc_common.h"
  27
  28 static int usage(void)
  29 {
  30         fprintf(stderr,
  31                 "Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n"
  32                 "       [ handle QHANDLE ] [ root | ingress | clsact | parent CLASSID ]\n"
  33                 "       [ estimator INTERVAL TIME_CONSTANT ]\n"
  34                 "       [ stab [ help | STAB_OPTIONS] ]\n"
  35                 "       [ ingress_block BLOCK_INDEX ] [ egress_block BLOCK_INDEX ]\n"
  36                 "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n"
  37                 "\n"
  38                 "       tc qdisc show [ dev STRING ] [ ingress | clsact ] [ invisible ]\n"
  39                 "Where:\n"
  40                 "QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n"
  41                 "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n"
  42                 "STAB_OPTIONS := ... try tc qdisc add stab help\n");
  43         return -1;
  44 }
  45
  46 static int tc_qdisc_modify(int cmd, unsigned int flags, int argc, char **argv)
  47 {
  48         struct qdisc_util *q = NULL;
  49         struct tc_estimator est = {};
  50         struct {
  51                 struct tc_sizespec      szopts;
  52                 __u16                   *data;
  53         } stab = {};
  54         char  d[IFNAMSIZ] = {};
  55         char  k[FILTER_NAMESZ] = {};
  56         struct {
  57                 struct nlmsghdr n;
  58                 struct tcmsg            t;
  59                 char                    buf[TCA_BUF_MAX];
  60         } req = {
  61                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
  62                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
  63                 .n.nlmsg_type = cmd,
  64                 .t.tcm_family = AF_UNSPEC,
  65         };
  66         __u32 ingress_block = 0;
  67         __u32 egress_block = 0;
  68
  69         while (argc > 0) {
  70                 if (strcmp(*argv, "dev") == 0) {
  71                         NEXT_ARG();
  72                         if (d[0])
  73                                 duparg("dev", *argv);
  74                         strncpy(d, *argv, sizeof(d)-1);
  75                 } else if (strcmp(*argv, "handle") == 0) {
  76                         __u32 handle;
  77
  78                         if (req.t.tcm_handle)
  79                                 duparg("handle", *argv);
  80                         NEXT_ARG();
  81                         if (get_qdisc_handle(&handle, *argv))
  82                                 invarg("invalid qdisc ID", *argv);
  83                         req.t.tcm_handle = handle;
  84                 } else if (strcmp(*argv, "root") == 0) {
  85                         if (req.t.tcm_parent) {
  86                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
  87                                 return -1;
  88                         }
  89                         req.t.tcm_parent = TC_H_ROOT;
  90                 } else if (strcmp(*argv, "clsact") == 0) {
  91                         if (req.t.tcm_parent) {
  92                                 fprintf(stderr, "Error: \"clsact\" is a duplicate parent ID\n");
  93                                 return -1;
  94                         }
  95                         req.t.tcm_parent = TC_H_CLSACT;
  96                         strncpy(k, "clsact", sizeof(k) - 1);
  97                         q = get_qdisc_kind(k);
  98                         req.t.tcm_handle = TC_H_MAKE(TC_H_CLSACT, 0);
  99                         NEXT_ARG_FWD();
 100                         break;
 101                 } else if (strcmp(*argv, "ingress") == 0) {
 102                         if (req.t.tcm_parent) {
 103                                 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
 104                                 return -1;
 105                         }
 106                         req.t.tcm_parent = TC_H_INGRESS;
 107                         strncpy(k, "ingress", sizeof(k) - 1);
 108                         q = get_qdisc_kind(k);
 109                         req.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
 110                         NEXT_ARG_FWD();
 111                         break;
 112                 } else if (strcmp(*argv, "parent") == 0) {
 113                         __u32 handle;
 114
 115                         NEXT_ARG();
 116                         if (req.t.tcm_parent)
 117                                 duparg("parent", *argv);
 118                         if (get_tc_classid(&handle, *argv))
 119                                 invarg("invalid parent ID", *argv);
 120                         req.t.tcm_parent = handle;
 121                 } else if (matches(*argv, "estimator") == 0) {
 122                         if (parse_estimator(&argc, &argv, &est))
 123                                 return -1;
 124                 } else if (matches(*argv, "stab") == 0) {
 125                         if (parse_size_table(&argc, &argv, &stab.szopts) < 0)
 126                                 return -1;
 127                         continue;
 128                 } else if (matches(*argv, "ingress_block") == 0) {
 129                         NEXT_ARG();
 130                         if (get_u32(&ingress_block, *argv, 0) || !ingress_block)
 131                                 invarg("invalid ingress block index value", *argv);
 132                 } else if (matches(*argv, "egress_block") == 0) {
 133                         NEXT_ARG();
 134                         if (get_u32(&egress_block, *argv, 0) || !egress_block)
 135                                 invarg("invalid egress block index value", *argv);
 136                 } else if (matches(*argv, "help") == 0) {
 137                         usage();
 138                 } else {
 139                         strncpy(k, *argv, sizeof(k)-1);
 140
 141                         q = get_qdisc_kind(k);
 142                         argc--; argv++;
 143                         break;
 144                 }
 145                 argc--; argv++;
 146         }
 147
 148         if (k[0])
 149                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 150         if (est.ewma_log)
 151                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 152
 153         if (ingress_block)
 154                 addattr32(&req.n, sizeof(req),
 155                           TCA_INGRESS_BLOCK, ingress_block);
 156         if (egress_block)
 157                 addattr32(&req.n, sizeof(req),
 158                           TCA_EGRESS_BLOCK, egress_block);
 159
 160         if (q) {
 161                 if (q->parse_qopt) {
 162                         if (q->parse_qopt(q, argc, argv, &req.n, d))
 163                                 return 1;
 164                 } else if (argc) {
 165                         fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
 166                         return -1;
 167                 }
 168         } else {
 169                 if (argc) {
 170                         if (matches(*argv, "help") == 0)
 171                                 usage();
 172
 173                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 174                         return -1;
 175                 }
 176         }
 177
 178         if (check_size_table_opts(&stab.szopts)) {
 179                 struct rtattr *tail;
 180
 181                 if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) {
 182                         fprintf(stderr, "failed to calculate size table.\n");
 183                         return -1;
 184                 }
 185
 186                 tail = addattr_nest(&req.n, sizeof(req), TCA_STAB);
 187                 addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts,
 188                           sizeof(stab.szopts));
 189                 if (stab.data)
 190                         addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data,
 191                                   stab.szopts.tsize * sizeof(__u16));
 192                 addattr_nest_end(&req.n, tail);
 193                 if (stab.data)
 194                         free(stab.data);
 195         }
 196
 197         if (d[0])  {
 198                 int idx;
 199
 200                 ll_init_map(&rth);
 201
 202                 idx = ll_name_to_index(d);
 203                 if (!idx)
 204                         return -nodev(d);
 205                 req.t.tcm_ifindex = idx;
 206         }
 207
 208         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 209                 return 2;
 210
 211         return 0;
 212 }
 213
 214 static int filter_ifindex;
 215
 216 int print_qdisc(struct nlmsghdr *n, void *arg)
 217 {
 218         FILE *fp = (FILE *)arg;
 219         struct tcmsg *t = NLMSG_DATA(n);
 220         int len = n->nlmsg_len;
 221         struct rtattr *tb[TCA_MAX+1];
 222         struct qdisc_util *q;
 223         char abuf[256];
 224
 225         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 226                 fprintf(stderr, "Not a qdisc\n");
 227                 return 0;
 228         }
 229         len -= NLMSG_LENGTH(sizeof(*t));
 230         if (len < 0) {
 231                 fprintf(stderr, "Wrong len %d\n", len);
 232                 return -1;
 233         }
 234
 235         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 236                 return 0;
 237
 238         parse_rtattr_flags(tb, TCA_MAX, TCA_RTA(t), len, NLA_F_NESTED);
 239
 240         if (tb[TCA_KIND] == NULL) {
 241                 fprintf(stderr, "print_qdisc: NULL kind\n");
 242                 return -1;
 243         }
 244
 245         open_json_object(NULL);
 246
 247         if (n->nlmsg_type == RTM_DELQDISC)
 248                 print_bool(PRINT_ANY, "deleted", "deleted ", true);
 249
 250         if (n->nlmsg_type == RTM_NEWQDISC &&
 251                         (n->nlmsg_flags & NLM_F_CREATE) &&
 252                         (n->nlmsg_flags & NLM_F_REPLACE))
 253                 print_bool(PRINT_ANY, "replaced", "replaced ", true);
 254
 255         if (n->nlmsg_type == RTM_NEWQDISC &&
 256                         (n->nlmsg_flags & NLM_F_CREATE) &&
 257                         (n->nlmsg_flags & NLM_F_EXCL))
 258                 print_bool(PRINT_ANY, "added", "added ", true);
 259
 260         print_string(PRINT_ANY, "kind", "qdisc %s",
 261                      rta_getattr_str(tb[TCA_KIND]));
 262         sprintf(abuf, "%x:", t->tcm_handle >> 16);
 263         print_string(PRINT_ANY, "handle", " %s", abuf);
 264         if (show_raw) {
 265                 sprintf(abuf, "[%08x]", t->tcm_handle);
 266                 print_string(PRINT_FP, NULL, "%s", abuf);
 267         }
 268         print_string(PRINT_FP, NULL, " ", NULL);
 269
 270         if (filter_ifindex == 0)
 271                 print_devname(PRINT_ANY, t->tcm_ifindex);
 272
 273         if (t->tcm_parent == TC_H_ROOT)
 274                 print_bool(PRINT_ANY, "root", "root ", true);
 275         else if (t->tcm_parent) {
 276                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 277                 print_string(PRINT_ANY, "parent", "parent %s ", abuf);
 278         }
 279
 280         if (t->tcm_info != 1)
 281                 print_uint(PRINT_ANY, "refcnt", "refcnt %u ", t->tcm_info);
 282
 283         if (tb[TCA_HW_OFFLOAD] &&
 284             (rta_getattr_u8(tb[TCA_HW_OFFLOAD])))
 285                 print_bool(PRINT_ANY, "offloaded", "offloaded ", true);
 286
 287         if (tb[TCA_INGRESS_BLOCK] &&
 288             RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) {
 289                 __u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]);
 290
 291                 if (block)
 292                         print_uint(PRINT_ANY, "ingress_block",
 293                                    "ingress_block %u ", block);
 294         }
 295
 296         if (tb[TCA_EGRESS_BLOCK] &&
 297             RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) {
 298                 __u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]);
 299
 300                 if (block)
 301                         print_uint(PRINT_ANY, "egress_block",
 302                                    "egress_block %u ", block);
 303         }
 304
 305         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 306         if (strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])) == 0)
 307                 q = get_qdisc_kind("prio");
 308         else
 309                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 310
 311         open_json_object("options");
 312         if (tb[TCA_OPTIONS]) {
 313                 if (q)
 314                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 315                 else
 316                         fprintf(stderr, "Cannot parse qdisc parameters\n");
 317         }
 318         close_json_object();
 319
 320         print_nl();
 321
 322         if (show_details && tb[TCA_STAB]) {
 323                 print_size_table(fp, " ", tb[TCA_STAB]);
 324                 print_nl();
 325         }
 326
 327         if (show_stats) {
 328                 struct rtattr *xstats = NULL;
 329
 330                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 331                         print_tcstats_attr(fp, tb, " ", &xstats);
 332                         print_nl();
 333                 }
 334
 335                 if (q && xstats && q->print_xstats) {
 336                         q->print_xstats(q, fp, xstats);
 337                         print_nl();
 338                 }
 339         }
 340         close_json_object();
 341         fflush(fp);
 342         return 0;
 343 }
 344
 345 static int tc_qdisc_list(int argc, char **argv)
 346 {
 347         struct tcmsg t = { .tcm_family = AF_UNSPEC };
 348         char d[IFNAMSIZ] = {};
 349         bool dump_invisible = false;
 350
 351         while (argc > 0) {
 352                 if (strcmp(*argv, "dev") == 0) {
 353                         NEXT_ARG();
 354                         strncpy(d, *argv, sizeof(d)-1);
 355                 } else if (strcmp(*argv, "ingress") == 0 ||
 356                            strcmp(*argv, "clsact") == 0) {
 357                         if (t.tcm_parent) {
 358                                 fprintf(stderr, "Duplicate parent ID\n");
 359                                 usage();
 360                         }
 361                         t.tcm_parent = TC_H_INGRESS;
 362                 } else if (matches(*argv, "help") == 0) {
 363                         usage();
 364                 } else if (strcmp(*argv, "invisible") == 0) {
 365                         dump_invisible = true;
 366                 } else {
 367                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 368                         return -1;
 369                 }
 370
 371                 argc--; argv++;
 372         }
 373
 374         ll_init_map(&rth);
 375
 376         if (d[0]) {
 377                 t.tcm_ifindex = ll_name_to_index(d);
 378                 if (!t.tcm_ifindex)
 379                         return -nodev(d);
 380                 filter_ifindex = t.tcm_ifindex;
 381         }
 382
 383         if (dump_invisible) {
 384                 struct {
 385                         struct nlmsghdr n;
 386                         struct tcmsg t;
 387                         char buf[256];
 388                 } req = {
 389                         .n.nlmsg_type = RTM_GETQDISC,
 390                         .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
 391                 };
 392
 393                 req.t.tcm_family = AF_UNSPEC;
 394
 395                 addattr(&req.n, 256, TCA_DUMP_INVISIBLE);
 396                 if (rtnl_dump_request_n(&rth, &req.n) < 0) {
 397                         perror("Cannot send dump request");
 398                         return 1;
 399                 }
 400
 401         } else if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 402                 perror("Cannot send dump request");
 403                 return 1;
 404         }
 405
 406         new_json_obj(json);
 407         if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) {
 408                 fprintf(stderr, "Dump terminated\n");
 409                 return 1;
 410         }
 411         delete_json_obj();
 412
 413         return 0;
 414 }
 415
 416 int do_qdisc(int argc, char **argv)
 417 {
 418         if (argc < 1)
 419                 return tc_qdisc_list(0, NULL);
 420         if (matches(*argv, "add") == 0)
 421                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 422         if (matches(*argv, "change") == 0)
 423                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 424         if (matches(*argv, "replace") == 0)
 425                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 426         if (matches(*argv, "link") == 0)
 427                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 428         if (matches(*argv, "delete") == 0)
 429                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 430 #if 0
 431         if (matches(*argv, "get") == 0)
 432                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 433 #endif
 434         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 435             || matches(*argv, "lst") == 0)
 436                 return tc_qdisc_list(argc-1, argv+1);
 437         if (matches(*argv, "help") == 0) {
 438                 usage();
 439                 return 0;
 440         }
 441         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 442         return -1;
 443 }
 444
 445 struct tc_qdisc_block_exists_ctx {
 446         __u32 block_index;
 447         bool found;
 448 };
 449
 450 static int tc_qdisc_block_exists_cb(struct nlmsghdr *n, void *arg)
 451 {
 452         struct tc_qdisc_block_exists_ctx *ctx = arg;
 453         struct tcmsg *t = NLMSG_DATA(n);
 454         struct rtattr *tb[TCA_MAX+1];
 455         int len = n->nlmsg_len;
 456
 457         if (n->nlmsg_type != RTM_NEWQDISC)
 458                 return 0;
 459
 460         len -= NLMSG_LENGTH(sizeof(*t));
 461         if (len < 0)
 462                 return -1;
 463
 464         parse_rtattr_flags(tb, TCA_MAX, TCA_RTA(t), len, NLA_F_NESTED);
 465
 466         if (tb[TCA_KIND] == NULL)
 467                 return -1;
 468
 469         if (tb[TCA_INGRESS_BLOCK] &&
 470             RTA_PAYLOAD(tb[TCA_INGRESS_BLOCK]) >= sizeof(__u32)) {
 471                 __u32 block = rta_getattr_u32(tb[TCA_INGRESS_BLOCK]);
 472
 473                 if (block == ctx->block_index)
 474                         ctx->found = true;
 475         }
 476
 477         if (tb[TCA_EGRESS_BLOCK] &&
 478             RTA_PAYLOAD(tb[TCA_EGRESS_BLOCK]) >= sizeof(__u32)) {
 479                 __u32 block = rta_getattr_u32(tb[TCA_EGRESS_BLOCK]);
 480
 481                 if (block == ctx->block_index)
 482                         ctx->found = true;
 483         }
 484         return 0;
 485 }
 486
 487 bool tc_qdisc_block_exists(__u32 block_index)
 488 {
 489         struct tc_qdisc_block_exists_ctx ctx = { .block_index = block_index };
 490         struct tcmsg t = { .tcm_family = AF_UNSPEC };
 491
 492         if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 493                 perror("Cannot send dump request");
 494                 return false;
 495         }
 496
 497         if (rtnl_dump_filter(&rth, tc_qdisc_block_exists_cb, &ctx) < 0) {
 498                 perror("Dump terminated\n");
 499                 return false;
 500         }
 501
 502         return ctx.found;
 503 }