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 <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 <math.h>
  23 #include <malloc.h>
  24
  25 #include "utils.h"
  26 #include "tc_util.h"
  27 #include "tc_common.h"
  28
  29 static int usage(void)
  30 {
  31         fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n");
  32         fprintf(stderr, "       [ handle QHANDLE ] [ root | ingress | clsact | parent CLASSID ]\n");
  33         fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
  34         fprintf(stderr, "       [ stab [ help | STAB_OPTIONS] ]\n");
  35         fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
  36         fprintf(stderr, "\n");
  37         fprintf(stderr, "       tc qdisc show [ dev STRING ] [ ingress | clsact ] [ invisible ]\n");
  38         fprintf(stderr, "Where:\n");
  39         fprintf(stderr, "QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n");
  40         fprintf(stderr, "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n");
  41         fprintf(stderr, "STAB_OPTIONS := ... try tc qdisc add stab help\n");
  42         return -1;
  43 }
  44
  45 static int tc_qdisc_modify(int cmd, unsigned int flags, int argc, char **argv)
  46 {
  47         struct qdisc_util *q = NULL;
  48         struct tc_estimator est = {};
  49         struct {
  50                 struct tc_sizespec      szopts;
  51                 __u16                   *data;
  52         } stab = {};
  53         char  d[16] = {};
  54         char  k[16] = {};
  55         struct {
  56                 struct nlmsghdr n;
  57                 struct tcmsg            t;
  58                 char                    buf[TCA_BUF_MAX];
  59         } req = {
  60                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
  61                 .n.nlmsg_flags = NLM_F_REQUEST | flags,
  62                 .n.nlmsg_type = cmd,
  63                 .t.tcm_family = AF_UNSPEC,
  64         };
  65
  66         while (argc > 0) {
  67                 if (strcmp(*argv, "dev") == 0) {
  68                         NEXT_ARG();
  69                         if (d[0])
  70                                 duparg("dev", *argv);
  71                         strncpy(d, *argv, sizeof(d)-1);
  72                 } else if (strcmp(*argv, "handle") == 0) {
  73                         __u32 handle;
  74
  75                         if (req.t.tcm_handle)
  76                                 duparg("handle", *argv);
  77                         NEXT_ARG();
  78                         if (get_qdisc_handle(&handle, *argv))
  79                                 invarg("invalid qdisc ID", *argv);
  80                         req.t.tcm_handle = handle;
  81                 } else if (strcmp(*argv, "root") == 0) {
  82                         if (req.t.tcm_parent) {
  83                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
  84                                 return -1;
  85                         }
  86                         req.t.tcm_parent = TC_H_ROOT;
  87                 } else if (strcmp(*argv, "clsact") == 0) {
  88                         if (req.t.tcm_parent) {
  89                                 fprintf(stderr, "Error: \"clsact\" is a duplicate parent ID\n");
  90                                 return -1;
  91                         }
  92                         req.t.tcm_parent = TC_H_CLSACT;
  93                         strncpy(k, "clsact", sizeof(k) - 1);
  94                         q = get_qdisc_kind(k);
  95                         req.t.tcm_handle = TC_H_MAKE(TC_H_CLSACT, 0);
  96                         NEXT_ARG_FWD();
  97                         break;
  98                 } else if (strcmp(*argv, "ingress") == 0) {
  99                         if (req.t.tcm_parent) {
 100                                 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
 101                                 return -1;
 102                         }
 103                         req.t.tcm_parent = TC_H_INGRESS;
 104                         strncpy(k, "ingress", sizeof(k) - 1);
 105                         q = get_qdisc_kind(k);
 106                         req.t.tcm_handle = TC_H_MAKE(TC_H_INGRESS, 0);
 107                         NEXT_ARG_FWD();
 108                         break;
 109                 } else if (strcmp(*argv, "parent") == 0) {
 110                         __u32 handle;
 111
 112                         NEXT_ARG();
 113                         if (req.t.tcm_parent)
 114                                 duparg("parent", *argv);
 115                         if (get_tc_classid(&handle, *argv))
 116                                 invarg("invalid parent ID", *argv);
 117                         req.t.tcm_parent = handle;
 118                 } else if (matches(*argv, "estimator") == 0) {
 119                         if (parse_estimator(&argc, &argv, &est))
 120                                 return -1;
 121                 } else if (matches(*argv, "stab") == 0) {
 122                         if (parse_size_table(&argc, &argv, &stab.szopts) < 0)
 123                                 return -1;
 124                         continue;
 125                 } else if (matches(*argv, "help") == 0) {
 126                         usage();
 127                 } else {
 128                         strncpy(k, *argv, sizeof(k)-1);
 129
 130                         q = get_qdisc_kind(k);
 131                         argc--; argv++;
 132                         break;
 133                 }
 134                 argc--; argv++;
 135         }
 136
 137         if (k[0])
 138                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 139         if (est.ewma_log)
 140                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 141
 142         if (q) {
 143                 if (q->parse_qopt) {
 144                         if (q->parse_qopt(q, argc, argv, &req.n))
 145                                 return 1;
 146                 } else if (argc) {
 147                         fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
 148                         return -1;
 149                 }
 150         } else {
 151                 if (argc) {
 152                         if (matches(*argv, "help") == 0)
 153                                 usage();
 154
 155                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 156                         return -1;
 157                 }
 158         }
 159
 160         if (check_size_table_opts(&stab.szopts)) {
 161                 struct rtattr *tail;
 162
 163                 if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) {
 164                         fprintf(stderr, "failed to calculate size table.\n");
 165                         return -1;
 166                 }
 167
 168                 tail = NLMSG_TAIL(&req.n);
 169                 addattr_l(&req.n, sizeof(req), TCA_STAB, NULL, 0);
 170                 addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts,
 171                           sizeof(stab.szopts));
 172                 if (stab.data)
 173                         addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data,
 174                                   stab.szopts.tsize * sizeof(__u16));
 175                 tail->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)tail;
 176                 if (stab.data)
 177                         free(stab.data);
 178         }
 179
 180         if (d[0])  {
 181                 int idx;
 182
 183                 ll_init_map(&rth);
 184
 185                 idx = ll_name_to_index(d);
 186                 if (idx == 0) {
 187                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 188                         return 1;
 189                 }
 190                 req.t.tcm_ifindex = idx;
 191         }
 192
 193         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 194                 return 2;
 195
 196         return 0;
 197 }
 198
 199 static int filter_ifindex;
 200
 201 int print_qdisc(const struct sockaddr_nl *who,
 202                 struct nlmsghdr *n, void *arg)
 203 {
 204         FILE *fp = (FILE *)arg;
 205         struct tcmsg *t = NLMSG_DATA(n);
 206         int len = n->nlmsg_len;
 207         struct rtattr *tb[TCA_MAX+1];
 208         struct qdisc_util *q;
 209         char abuf[256];
 210
 211         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 212                 fprintf(stderr, "Not a qdisc\n");
 213                 return 0;
 214         }
 215         len -= NLMSG_LENGTH(sizeof(*t));
 216         if (len < 0) {
 217                 fprintf(stderr, "Wrong len %d\n", len);
 218                 return -1;
 219         }
 220
 221         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 222                 return 0;
 223
 224         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 225
 226         if (tb[TCA_KIND] == NULL) {
 227                 fprintf(stderr, "print_qdisc: NULL kind\n");
 228                 return -1;
 229         }
 230
 231         if (n->nlmsg_type == RTM_DELQDISC)
 232                 fprintf(fp, "deleted ");
 233
 234         if (show_raw)
 235                 fprintf(fp, "qdisc %s %x:[%08x]  ",
 236                         rta_getattr_str(tb[TCA_KIND]),
 237                         t->tcm_handle >> 16, t->tcm_handle);
 238         else
 239                 fprintf(fp, "qdisc %s %x: ", rta_getattr_str(tb[TCA_KIND]),
 240                         t->tcm_handle >> 16);
 241
 242         if (filter_ifindex == 0)
 243                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 244
 245         if (t->tcm_parent == TC_H_ROOT)
 246                 fprintf(fp, "root ");
 247         else if (t->tcm_parent) {
 248                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 249                 fprintf(fp, "parent %s ", abuf);
 250         }
 251
 252         if (t->tcm_info != 1)
 253                 fprintf(fp, "refcnt %d ", t->tcm_info);
 254
 255         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 256         if (strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])) == 0)
 257                 q = get_qdisc_kind("prio");
 258         else
 259                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 260
 261         if (tb[TCA_OPTIONS]) {
 262                 if (q)
 263                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 264                 else
 265                         fprintf(fp, "[cannot parse qdisc parameters]");
 266         }
 267         fprintf(fp, "\n");
 268
 269         if (show_details && tb[TCA_STAB]) {
 270                 print_size_table(fp, " ", tb[TCA_STAB]);
 271                 fprintf(fp, "\n");
 272         }
 273
 274         if (show_stats) {
 275                 struct rtattr *xstats = NULL;
 276
 277                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 278                         print_tcstats_attr(fp, tb, " ", &xstats);
 279                         fprintf(fp, "\n");
 280                 }
 281
 282                 if (q && xstats && q->print_xstats) {
 283                         q->print_xstats(q, fp, xstats);
 284                         fprintf(fp, "\n");
 285                 }
 286         }
 287         fflush(fp);
 288         return 0;
 289 }
 290
 291 static int tc_qdisc_list(int argc, char **argv)
 292 {
 293         struct tcmsg t = { .tcm_family = AF_UNSPEC };
 294         char d[16] = {};
 295         bool dump_invisible = false;
 296
 297         while (argc > 0) {
 298                 if (strcmp(*argv, "dev") == 0) {
 299                         NEXT_ARG();
 300                         strncpy(d, *argv, sizeof(d)-1);
 301                 } else if (strcmp(*argv, "ingress") == 0 ||
 302                            strcmp(*argv, "clsact") == 0) {
 303                         if (t.tcm_parent) {
 304                                 fprintf(stderr, "Duplicate parent ID\n");
 305                                 usage();
 306                         }
 307                         t.tcm_parent = TC_H_INGRESS;
 308                 } else if (matches(*argv, "help") == 0) {
 309                         usage();
 310                 } else if (strcmp(*argv, "invisible") == 0) {
 311                         dump_invisible = true;
 312                 } else {
 313                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 314                         return -1;
 315                 }
 316
 317                 argc--; argv++;
 318         }
 319
 320         ll_init_map(&rth);
 321
 322         if (d[0]) {
 323                 t.tcm_ifindex = ll_name_to_index(d);
 324                 if (t.tcm_ifindex == 0) {
 325                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 326                         return 1;
 327                 }
 328                 filter_ifindex = t.tcm_ifindex;
 329         }
 330
 331         if (dump_invisible) {
 332                 struct {
 333                         struct nlmsghdr n;
 334                         struct tcmsg t;
 335                         char buf[256];
 336                 } req = {
 337                         .n.nlmsg_type = RTM_GETQDISC,
 338                         .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
 339                 };
 340
 341                 req.t.tcm_family = AF_UNSPEC;
 342
 343                 addattr(&req.n, 256, TCA_DUMP_INVISIBLE);
 344                 if (rtnl_dump_request_n(&rth, &req.n) < 0) {
 345                         perror("Cannot send dump request");
 346                         return 1;
 347                 }
 348
 349         } else if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 350                 perror("Cannot send dump request");
 351                 return 1;
 352         }
 353
 354         if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) {
 355                 fprintf(stderr, "Dump terminated\n");
 356                 return 1;
 357         }
 358
 359         return 0;
 360 }
 361
 362 int do_qdisc(int argc, char **argv)
 363 {
 364         if (argc < 1)
 365                 return tc_qdisc_list(0, NULL);
 366         if (matches(*argv, "add") == 0)
 367                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 368         if (matches(*argv, "change") == 0)
 369                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 370         if (matches(*argv, "replace") == 0)
 371                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 372         if (matches(*argv, "link") == 0)
 373                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 374         if (matches(*argv, "delete") == 0)
 375                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 376 #if 0
 377         if (matches(*argv, "get") == 0)
 378                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 379 #endif
 380         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 381             || matches(*argv, "lst") == 0)
 382                 return tc_qdisc_list(argc-1, argv+1);
 383         if (matches(*argv, "help") == 0) {
 384                 usage();
 385                 return 0;
 386         }
 387         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 388         return -1;
 389 }