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