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 static int usage(void)
  32 {
  33         fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | show ] dev STRING\n");
  34         fprintf(stderr, "       [ handle QHANDLE ] [ root | ingress | parent CLASSID ]\n");
  35         fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
  36         fprintf(stderr, "       [ stab [ help | STAB_OPTIONS] ]\n");
  37         fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
  38         fprintf(stderr, "\n");
  39         fprintf(stderr, "       tc qdisc show [ dev STRING ] [ingress]\n");
  40         fprintf(stderr, "Where:\n");
  41         fprintf(stderr, "QDISC_KIND := { [p|b]fifo | tbf | prio | cbq | red | etc. }\n");
  42         fprintf(stderr, "OPTIONS := ... try tc qdisc add <desired QDISC_KIND> help\n");
  43         fprintf(stderr, "STAB_OPTIONS := ... try tc qdisc add stab help\n");
  44         return -1;
  45 }
  46
  47 static int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
  48 {
  49         struct qdisc_util *q = NULL;
  50         struct tc_estimator est;
  51         struct {
  52                 struct tc_sizespec      szopts;
  53                 __u16                   *data;
  54         } stab;
  55         char  d[16];
  56         char  k[16];
  57         struct {
  58                 struct nlmsghdr         n;
  59                 struct tcmsg            t;
  60                 char                    buf[TCA_BUF_MAX];
  61         } req;
  62
  63         memset(&req, 0, sizeof(req));
  64         memset(&stab, 0, sizeof(stab));
  65         memset(&est, 0, sizeof(est));
  66         memset(&d, 0, sizeof(d));
  67         memset(&k, 0, sizeof(k));
  68
  69         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
  70         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
  71         req.n.nlmsg_type = cmd;
  72         req.t.tcm_family = AF_UNSPEC;
  73
  74         while (argc > 0) {
  75                 if (strcmp(*argv, "dev") == 0) {
  76                         NEXT_ARG();
  77                         if (d[0])
  78                                 duparg("dev", *argv);
  79                         strncpy(d, *argv, sizeof(d)-1);
  80                 } else if (strcmp(*argv, "handle") == 0) {
  81                         __u32 handle;
  82                         if (req.t.tcm_handle)
  83                                 duparg("handle", *argv);
  84                         NEXT_ARG();
  85                         if (get_qdisc_handle(&handle, *argv))
  86                                 invarg("invalid qdisc ID", *argv);
  87                         req.t.tcm_handle = handle;
  88                 } else if (strcmp(*argv, "root") == 0) {
  89                         if (req.t.tcm_parent) {
  90                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
  91                                 return -1;
  92                         }
  93                         req.t.tcm_parent = TC_H_ROOT;
  94 #ifdef TC_H_INGRESS
  95                 } else if (strcmp(*argv, "ingress") == 0) {
  96                         if (req.t.tcm_parent) {
  97                                 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
  98                                 return -1;
  99                         }
 100                         req.t.tcm_parent = TC_H_INGRESS;
 101                         strncpy(k, "ingress", sizeof(k)-1);
 102                         q = get_qdisc_kind(k);
 103                         req.t.tcm_handle = 0xffff0000;
 104
 105                         argc--; argv++;
 106                         break;
 107 #endif
 108                 } else if (strcmp(*argv, "parent") == 0) {
 109                         __u32 handle;
 110                         NEXT_ARG();
 111                         if (req.t.tcm_parent)
 112                                 duparg("parent", *argv);
 113                         if (get_tc_classid(&handle, *argv))
 114                                 invarg("invalid parent ID", *argv);
 115                         req.t.tcm_parent = handle;
 116                 } else if (matches(*argv, "estimator") == 0) {
 117                         if (parse_estimator(&argc, &argv, &est))
 118                                 return -1;
 119                 } else if (matches(*argv, "stab") == 0) {
 120                         if (parse_size_table(&argc, &argv, &stab.szopts) < 0)
 121                                 return -1;
 122                         continue;
 123                 } else if (matches(*argv, "help") == 0) {
 124                         usage();
 125                 } else {
 126                         strncpy(k, *argv, sizeof(k)-1);
 127
 128                         q = get_qdisc_kind(k);
 129                         argc--; argv++;
 130                         break;
 131                 }
 132                 argc--; argv++;
 133         }
 134
 135         if (k[0])
 136                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 137         if (est.ewma_log)
 138                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 139
 140         if (q) {
 141                 if (q->parse_qopt) {
 142                         if (q->parse_qopt(q, argc, argv, &req.n))
 143                                 return 1;
 144                 } else if (argc) {
 145                         fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
 146                         return -1;
 147                 }
 148         } else {
 149                 if (argc) {
 150                         if (matches(*argv, "help") == 0)
 151                                 usage();
 152
 153                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 154                         return -1;
 155                 }
 156         }
 157
 158         if (check_size_table_opts(&stab.szopts)) {
 159                 struct rtattr *tail;
 160
 161                 if (tc_calc_size_table(&stab.szopts, &stab.data) < 0) {
 162                         fprintf(stderr, "failed to calculate size table.\n");
 163                         return -1;
 164                 }
 165
 166                 tail = NLMSG_TAIL(&req.n);
 167                 addattr_l(&req.n, sizeof(req), TCA_STAB, NULL, 0);
 168                 addattr_l(&req.n, sizeof(req), TCA_STAB_BASE, &stab.szopts,
 169                           sizeof(stab.szopts));
 170                 if (stab.data)
 171                         addattr_l(&req.n, sizeof(req), TCA_STAB_DATA, stab.data,
 172                                   stab.szopts.tsize * sizeof(__u16));
 173                 tail->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)tail;
 174                 if (stab.data)
 175                         free(stab.data);
 176         }
 177
 178         if (d[0])  {
 179                 int idx;
 180
 181                 ll_init_map(&rth);
 182
 183                 if ((idx = ll_name_to_index(d)) == 0) {
 184                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 185                         return 1;
 186                 }
 187                 req.t.tcm_ifindex = idx;
 188         }
 189
 190         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 191                 return 2;
 192
 193         return 0;
 194 }
 195
 196 static int filter_ifindex;
 197
 198 int print_qdisc(const struct sockaddr_nl *who,
 199                        struct nlmsghdr *n,
 200                        void *arg)
 201 {
 202         FILE *fp = (FILE*)arg;
 203         struct tcmsg *t = NLMSG_DATA(n);
 204         int len = n->nlmsg_len;
 205         struct rtattr * tb[TCA_MAX+1];
 206         struct qdisc_util *q;
 207         char abuf[256];
 208
 209         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 210                 fprintf(stderr, "Not a qdisc\n");
 211                 return 0;
 212         }
 213         len -= NLMSG_LENGTH(sizeof(*t));
 214         if (len < 0) {
 215                 fprintf(stderr, "Wrong len %d\n", len);
 216                 return -1;
 217         }
 218
 219         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 220                 return 0;
 221
 222         memset(tb, 0, sizeof(tb));
 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         if (n->nlmsg_type == RTM_DELQDISC)
 231                 fprintf(fp, "deleted ");
 232
 233         fprintf(fp, "qdisc %s %x: ", rta_getattr_str(tb[TCA_KIND]), t->tcm_handle>>16);
 234         if (filter_ifindex == 0)
 235                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 236         if (t->tcm_parent == TC_H_ROOT)
 237                 fprintf(fp, "root ");
 238         else if (t->tcm_parent) {
 239                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 240                 fprintf(fp, "parent %s ", abuf);
 241         }
 242         if (t->tcm_info != 1) {
 243                 fprintf(fp, "refcnt %d ", t->tcm_info);
 244         }
 245         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 246
 247         if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
 248                 q = get_qdisc_kind("prio");
 249         else
 250                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 251
 252         if (tb[TCA_OPTIONS]) {
 253                 if (q)
 254                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 255                 else
 256                         fprintf(fp, "[cannot parse qdisc parameters]");
 257         }
 258         fprintf(fp, "\n");
 259         if (show_details && tb[TCA_STAB]) {
 260                 print_size_table(fp, " ", tb[TCA_STAB]);
 261                 fprintf(fp, "\n");
 262         }
 263         if (show_stats) {
 264                 struct rtattr *xstats = NULL;
 265
 266                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 267                         print_tcstats_attr(fp, tb, " ", &xstats);
 268                         fprintf(fp, "\n");
 269                 }
 270
 271                 if (q && xstats && q->print_xstats) {
 272                         q->print_xstats(q, fp, xstats);
 273                         fprintf(fp, "\n");
 274                 }
 275         }
 276         fflush(fp);
 277         return 0;
 278 }
 279
 280
 281 static int tc_qdisc_list(int argc, char **argv)
 282 {
 283         struct tcmsg t;
 284         char d[16];
 285
 286         memset(&t, 0, sizeof(t));
 287         t.tcm_family = AF_UNSPEC;
 288         memset(&d, 0, sizeof(d));
 289
 290         while (argc > 0) {
 291                 if (strcmp(*argv, "dev") == 0) {
 292                         NEXT_ARG();
 293                         strncpy(d, *argv, sizeof(d)-1);
 294 #ifdef TC_H_INGRESS
 295                 } else if (strcmp(*argv, "ingress") == 0) {
 296                              if (t.tcm_parent) {
 297                                      fprintf(stderr, "Duplicate parent ID\n");
 298                                      usage();
 299                              }
 300                              t.tcm_parent = TC_H_INGRESS;
 301 #endif
 302                 } else if (matches(*argv, "help") == 0) {
 303                         usage();
 304                 } else {
 305                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 306                         return -1;
 307                 }
 308
 309                 argc--; argv++;
 310         }
 311
 312         ll_init_map(&rth);
 313
 314         if (d[0]) {
 315                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 316                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 317                         return 1;
 318                 }
 319                 filter_ifindex = t.tcm_ifindex;
 320         }
 321
 322         if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 323                 perror("Cannot send dump request");
 324                 return 1;
 325         }
 326
 327         if (rtnl_dump_filter(&rth, print_qdisc, stdout) < 0) {
 328                 fprintf(stderr, "Dump terminated\n");
 329                 return 1;
 330         }
 331
 332         return 0;
 333 }
 334
 335 int do_qdisc(int argc, char **argv)
 336 {
 337         if (argc < 1)
 338                 return tc_qdisc_list(0, NULL);
 339         if (matches(*argv, "add") == 0)
 340                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 341         if (matches(*argv, "change") == 0)
 342                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 343         if (matches(*argv, "replace") == 0)
 344                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 345         if (matches(*argv, "link") == 0)
 346                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 347         if (matches(*argv, "delete") == 0)
 348                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 349 #if 0
 350         if (matches(*argv, "get") == 0)
 351                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 352 #endif
 353         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 354             || matches(*argv, "lst") == 0)
 355                 return tc_qdisc_list(argc-1, argv+1);
 356         if (matches(*argv, "help") == 0) {
 357                 usage();
 358                 return 0;
 359         }
 360         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 361         return -1;
 362 }