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
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include "tc_common.h"
  27
  28 static int usage(void);
  29
  30 static int usage(void)
  31 {
  32         fprintf(stderr, "Usage: tc qdisc [ add | del | replace | change | get ] dev STRING\n");
  33         fprintf(stderr, "       [ handle QHANDLE ] [ root | ingress | parent CLASSID ]\n");
  34         fprintf(stderr, "       [ estimator INTERVAL TIME_CONSTANT ]\n");
  35         fprintf(stderr, "       [ [ QDISC_KIND ] [ help | OPTIONS ] ]\n");
  36         fprintf(stderr, "\n");
  37         fprintf(stderr, "       tc qdisc show [ dev STRING ] [ingress]\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         return -1;
  42 }
  43
  44 int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
  45 {
  46         struct rtnl_handle rth;
  47         struct qdisc_util *q = NULL;
  48         struct tc_estimator est;
  49         char  d[16];
  50         char  k[16];
  51         struct {
  52                 struct nlmsghdr         n;
  53                 struct tcmsg            t;
  54                 char                    buf[TCA_BUF_MAX];
  55         } req;
  56
  57         memset(&req, 0, sizeof(req));
  58         memset(&est, 0, sizeof(est));
  59         memset(&d, 0, sizeof(d));
  60         memset(&k, 0, sizeof(k));
  61
  62         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
  63         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
  64         req.n.nlmsg_type = cmd;
  65         req.t.tcm_family = AF_UNSPEC;
  66
  67         while (argc > 0) {
  68                 if (strcmp(*argv, "dev") == 0) {
  69                         NEXT_ARG();
  70                         if (d[0])
  71                                 duparg("dev", *argv);
  72                         strncpy(d, *argv, sizeof(d)-1);
  73                 } else if (strcmp(*argv, "handle") == 0) {
  74                         __u32 handle;
  75                         if (req.t.tcm_handle)
  76                                 duparg("handle", *argv);
  77                         NEXT_ARG();
  78                         if (get_qdisc_handle(&handle, *argv))
  79                                 invarg(*argv, "invalid qdisc ID");
  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 #ifdef TC_H_INGRESS
  88                 } else if (strcmp(*argv, "ingress") == 0) {
  89                         if (req.t.tcm_parent) {
  90                                 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
  91                                 return -1;
  92                         }
  93                         req.t.tcm_parent = TC_H_INGRESS;
  94                         strncpy(k, "ingress", sizeof(k)-1);
  95                         q = get_qdisc_kind(k);
  96                         req.t.tcm_handle = 0xffff0000;
  97
  98                         argc--; argv++;
  99                         break;
 100 #endif
 101                 } else if (strcmp(*argv, "parent") == 0) {
 102                         __u32 handle;
 103                         NEXT_ARG();
 104                         if (req.t.tcm_parent)
 105                                 duparg("parent", *argv);
 106                         if (get_tc_classid(&handle, *argv))
 107                                 invarg(*argv, "invalid parent ID");
 108                         req.t.tcm_parent = handle;
 109                 } else if (matches(*argv, "estimator") == 0) {
 110                         if (parse_estimator(&argc, &argv, &est))
 111                                 return -1;
 112                 } else if (matches(*argv, "help") == 0) {
 113                         usage();
 114                 } else {
 115                         strncpy(k, *argv, sizeof(k)-1);
 116
 117                         q = get_qdisc_kind(k);
 118                         argc--; argv++;
 119                         break;
 120                 }
 121                 argc--; argv++;
 122         }
 123
 124         if (k[0])
 125                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 126         if (est.ewma_log)
 127                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 128
 129         if (q) {
 130                 if (q->parse_qopt(q, argc, argv, &req.n))
 131                         return 1;
 132         } else {
 133                 if (argc) {
 134                         if (matches(*argv, "help") == 0)
 135                                 usage();
 136
 137                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 138                         return -1;
 139                 }
 140         }
 141
 142         if (!is_batch_mode)
 143                 if (rtnl_open(&rth, 0) < 0) {
 144                         fprintf(stderr, "Cannot open rtnetlink\n");
 145                         rtnl_close(&rth);
 146                         return 1;
 147                 }
 148
 149         if (d[0])  {
 150                 int idx;
 151
 152                 ll_init_map(&(is_batch_mode?g_rth:rth));
 153
 154                 if ((idx = ll_name_to_index(d)) == 0) {
 155                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 156                         rtnl_close(&rth);
 157                         return 1;
 158                 }
 159                 req.t.tcm_ifindex = idx;
 160         }
 161
 162         if (rtnl_talk(&(is_batch_mode?g_rth:rth), &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 163                 if (!is_batch_mode)
 164                         rtnl_close(&rth);
 165                 return 2;
 166         }
 167
 168         if (!is_batch_mode)
 169                 rtnl_close(&rth);
 170         return 0;
 171 }
 172
 173 static int filter_ifindex;
 174
 175 static int print_qdisc(const struct sockaddr_nl *who,
 176                        struct nlmsghdr *n,
 177                        void *arg)
 178 {
 179         FILE *fp = (FILE*)arg;
 180         struct tcmsg *t = NLMSG_DATA(n);
 181         int len = n->nlmsg_len;
 182         struct rtattr * tb[TCA_MAX+1];
 183         struct qdisc_util *q;
 184         char abuf[256];
 185
 186         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 187                 fprintf(stderr, "Not a qdisc\n");
 188                 return 0;
 189         }
 190         len -= NLMSG_LENGTH(sizeof(*t));
 191         if (len < 0) {
 192                 fprintf(stderr, "Wrong len %d\n", len);
 193                 return -1;
 194         }
 195
 196         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 197                 return 0;
 198
 199         memset(tb, 0, sizeof(tb));
 200         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 201
 202         if (tb[TCA_KIND] == NULL) {
 203                 fprintf(stderr, "print_qdisc: NULL kind\n");
 204                 return -1;
 205         }
 206
 207         if (n->nlmsg_type == RTM_DELQDISC)
 208                 fprintf(fp, "deleted ");
 209
 210         fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
 211         if (filter_ifindex == 0)
 212                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 213         if (t->tcm_parent == TC_H_ROOT)
 214                 fprintf(fp, "root ");
 215         else if (t->tcm_parent) {
 216                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 217                 fprintf(fp, "parent %s ", abuf);
 218         }
 219         if (t->tcm_info != 1) {
 220                 fprintf(fp, "refcnt %d ", t->tcm_info);
 221         }
 222         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 223
 224         if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
 225                 q = get_qdisc_kind("prio");
 226         else
 227                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 228
 229         if (tb[TCA_OPTIONS]) {
 230                 if (q)
 231                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 232                 else
 233                         fprintf(fp, "[cannot parse qdisc parameters]");
 234         }
 235         fprintf(fp, "\n");
 236         if (show_stats) {
 237                 struct rtattr *xstats = NULL;
 238
 239                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 240                         print_tcstats_attr(fp, tb, " ", &xstats);
 241                         fprintf(fp, "\n");
 242                 }
 243
 244                 if (q && xstats && q->print_xstats) {
 245                         q->print_xstats(q, fp, xstats);
 246                         fprintf(fp, "\n");
 247                 }
 248         }
 249         fflush(fp);
 250         return 0;
 251 }
 252
 253
 254 int tc_qdisc_list(int argc, char **argv)
 255 {
 256         struct tcmsg t;
 257         struct rtnl_handle rth;
 258         char d[16];
 259
 260         memset(&t, 0, sizeof(t));
 261         t.tcm_family = AF_UNSPEC;
 262         memset(&d, 0, sizeof(d));
 263
 264         while (argc > 0) {
 265                 if (strcmp(*argv, "dev") == 0) {
 266                         NEXT_ARG();
 267                         strncpy(d, *argv, sizeof(d)-1);
 268 #ifdef TC_H_INGRESS
 269                 } else if (strcmp(*argv, "ingress") == 0) {
 270                              if (t.tcm_parent) {
 271                                      fprintf(stderr, "Duplicate parent ID\n");
 272                                      usage();
 273                              }
 274                              t.tcm_parent = TC_H_INGRESS;
 275 #endif
 276                 } else if (matches(*argv, "help") == 0) {
 277                         usage();
 278                 } else {
 279                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 280                         return -1;
 281                 }
 282
 283                 argc--; argv++;
 284         }
 285
 286         if (!is_batch_mode)
 287                 if (rtnl_open(&rth, 0) < 0) {
 288                         fprintf(stderr, "Cannot open rtnetlink\n");
 289                         return 1;
 290                 }
 291
 292         ll_init_map(&(is_batch_mode?g_rth:rth));
 293
 294         if (d[0]) {
 295                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 296                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 297                         rtnl_close(&rth);
 298                         return 1;
 299                 }
 300                 filter_ifindex = t.tcm_ifindex;
 301         }
 302
 303         if (rtnl_dump_request(&(is_batch_mode?g_rth:rth), RTM_GETQDISC, &t, sizeof(t)) < 0) {
 304                 perror("Cannot send dump request");
 305                 if (!is_batch_mode)
 306                         rtnl_close(&rth);
 307                 return 1;
 308         }
 309
 310         if (rtnl_dump_filter(&(is_batch_mode?g_rth:rth), print_qdisc, stdout, NULL, NULL) < 0) {
 311                 fprintf(stderr, "Dump terminated\n");
 312                 if (!is_batch_mode)
 313                         rtnl_close(&rth);
 314                 return 1;
 315         }
 316
 317         if (!is_batch_mode)
 318                 rtnl_close(&rth);
 319         return 0;
 320 }
 321
 322 int do_qdisc(int argc, char **argv)
 323 {
 324         if (argc < 1)
 325                 return tc_qdisc_list(0, NULL);
 326         if (matches(*argv, "add") == 0)
 327                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 328         if (matches(*argv, "change") == 0)
 329                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 330         if (matches(*argv, "replace") == 0)
 331                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 332         if (matches(*argv, "link") == 0)
 333                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 334         if (matches(*argv, "delete") == 0)
 335                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 336 #if 0
 337         if (matches(*argv, "get") == 0)
 338                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 339 #endif
 340         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 341             || matches(*argv, "lst") == 0)
 342                 return tc_qdisc_list(argc-1, argv+1);
 343         if (matches(*argv, "help") == 0)
 344                 usage();
 345         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 346         return -1;
 347 }