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