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