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 void usage(void) __attribute__((noreturn));
  29
  30 static void 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         exit(-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                                 exit(-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                                 exit(-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                         exit(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                         exit(-1);
 139                 }
 140         }
 141
 142         if (rtnl_open(&rth, 0) < 0) {
 143                 fprintf(stderr, "Cannot open rtnetlink\n");
 144                 rtnl_close(&rth);
 145                 exit(1);
 146         }
 147
 148         if (d[0])  {
 149                 int idx;
 150
 151                 ll_init_map(&rth);
 152
 153                 if ((idx = ll_name_to_index(d)) == 0) {
 154                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 155                         rtnl_close(&rth);
 156                         exit(1);
 157                 }
 158                 req.t.tcm_ifindex = idx;
 159         }
 160
 161         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 162                 rtnl_close(&rth);
 163                 exit(2);
 164         }
 165
 166         rtnl_close(&rth);
 167         return 0;
 168 }
 169
 170
 171 void print_tcstats_attr(FILE *fp, const struct rtattr *rta)
 172 {
 173         struct tc_stats st;
 174         SPRINT_BUF(b1);
 175
 176         /* handle case where kernel returns more/less than we know about */
 177         memset(&st, 0, sizeof(st));
 178         memcpy(&st, RTA_DATA(rta), MIN(RTA_PAYLOAD(rta), sizeof(st)));
 179
 180         fprintf(fp, " Sent %llu bytes %u pkts (dropped %u, overlimits %u) ",
 181                 (unsigned long long)st.bytes, st.packets, st.drops,
 182                 st.overlimits);
 183
 184         if (st.bps || st.pps || st.qlen || st.backlog) {
 185                 fprintf(fp, "\n ");
 186                 if (st.bps || st.pps) {
 187                         fprintf(fp, "rate ");
 188                         if (st.bps)
 189                                 fprintf(fp, "%s ", sprint_rate(st.bps, b1));
 190                         if (st.pps)
 191                                 fprintf(fp, "%upps ", st.pps);
 192                 }
 193                 if (st.qlen || st.backlog) {
 194                         fprintf(fp, "backlog ");
 195                         if (st.backlog)
 196                                 fprintf(fp, "%s ", sprint_size(st.backlog, b1));
 197                         if (st.qlen)
 198                                 fprintf(fp, "%up ", st.qlen);
 199                 }
 200         }
 201 }
 202
 203 static int filter_ifindex;
 204
 205 static int print_qdisc(const struct sockaddr_nl *who,
 206                        struct nlmsghdr *n,
 207                        void *arg)
 208 {
 209         FILE *fp = (FILE*)arg;
 210         struct tcmsg *t = NLMSG_DATA(n);
 211         int len = n->nlmsg_len;
 212         struct rtattr * tb[TCA_MAX+1];
 213         struct qdisc_util *q;
 214         char abuf[256];
 215
 216         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 217                 fprintf(stderr, "Not a qdisc\n");
 218                 return 0;
 219         }
 220         len -= NLMSG_LENGTH(sizeof(*t));
 221         if (len < 0) {
 222                 fprintf(stderr, "Wrong len %d\n", len);
 223                 return -1;
 224         }
 225
 226         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 227                 return 0;
 228
 229         memset(tb, 0, sizeof(tb));
 230         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 231
 232         if (tb[TCA_KIND] == NULL) {
 233                 fprintf(stderr, "print_qdisc: NULL kind\n");
 234                 return -1;
 235         }
 236
 237         if (n->nlmsg_type == RTM_DELQDISC)
 238                 fprintf(fp, "deleted ");
 239
 240         fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
 241         if (filter_ifindex == 0)
 242                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 243         if (t->tcm_parent == TC_H_ROOT)
 244                 fprintf(fp, "root ");
 245         else if (t->tcm_parent) {
 246                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 247                 fprintf(fp, "parent %s ", abuf);
 248         }
 249         if (t->tcm_info != 1) {
 250                 fprintf(fp, "refcnt %d ", t->tcm_info);
 251         }
 252         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 253
 254         if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
 255                 q = get_qdisc_kind("prio");
 256         else
 257                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 258
 259         if (tb[TCA_OPTIONS]) {
 260                 if (q)
 261                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 262                 else
 263                         fprintf(fp, "[cannot parse qdisc parameters]");
 264         }
 265         fprintf(fp, "\n");
 266         if (show_stats) {
 267                 if (tb[TCA_STATS]) {
 268                         print_tcstats_attr(fp, tb[TCA_STATS]);
 269                         fprintf(fp, "\n");
 270                 }
 271
 272                 if (q && tb[TCA_XSTATS] && q->print_xstats) {
 273                         q->print_xstats(q, fp, tb[TCA_XSTATS]);
 274                         fprintf(fp, "\n");
 275                 }
 276         }
 277         fflush(fp);
 278         return 0;
 279 }
 280
 281
 282 int tc_qdisc_list(int argc, char **argv)
 283 {
 284         struct tcmsg t;
 285         struct rtnl_handle rth;
 286         char d[16];
 287
 288         memset(&t, 0, sizeof(t));
 289         t.tcm_family = AF_UNSPEC;
 290         memset(&d, 0, sizeof(d));
 291
 292         while (argc > 0) {
 293                 if (strcmp(*argv, "dev") == 0) {
 294                         NEXT_ARG();
 295                         strncpy(d, *argv, sizeof(d)-1);
 296 #ifdef TC_H_INGRESS
 297                 } else if (strcmp(*argv, "ingress") == 0) {
 298                              if (t.tcm_parent) {
 299                                      fprintf(stderr, "Duplicate parent ID\n");
 300                                      usage();
 301                              }
 302                              t.tcm_parent = TC_H_INGRESS;
 303 #endif
 304                 } else if (matches(*argv, "help") == 0) {
 305                         usage();
 306                 } else {
 307                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 308                         return -1;
 309                 }
 310
 311                 argc--; argv++;
 312         }
 313
 314         if (rtnl_open(&rth, 0) < 0) {
 315                 fprintf(stderr, "Cannot open rtnetlink\n");
 316                 exit(1);
 317         }
 318
 319         ll_init_map(&rth);
 320
 321         if (d[0]) {
 322                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 323                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 324                         rtnl_close(&rth);
 325                         exit(1);
 326                 }
 327                 filter_ifindex = t.tcm_ifindex;
 328         }
 329
 330         if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 331                 perror("Cannot send dump request");
 332                 rtnl_close(&rth);
 333                 exit(1);
 334         }
 335
 336         if (rtnl_dump_filter(&rth, print_qdisc, stdout, NULL, NULL) < 0) {
 337                 fprintf(stderr, "Dump terminated\n");
 338                 rtnl_close(&rth);
 339                 exit(1);
 340         }
 341
 342         rtnl_close(&rth);
 343         return 0;
 344 }
 345
 346 int do_qdisc(int argc, char **argv)
 347 {
 348         if (argc < 1)
 349                 return tc_qdisc_list(0, NULL);
 350         if (matches(*argv, "add") == 0)
 351                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 352         if (matches(*argv, "change") == 0)
 353                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 354         if (matches(*argv, "replace") == 0)
 355                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 356         if (matches(*argv, "link") == 0)
 357                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 358         if (matches(*argv, "delete") == 0)
 359                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 360 #if 0
 361         if (matches(*argv, "get") == 0)
 362                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 363 #endif
 364         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 365             || matches(*argv, "lst") == 0)
 366                 return tc_qdisc_list(argc-1, argv+1);
 367         if (matches(*argv, "help") == 0)
 368                 usage();
 369         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 370         return -1;
 371 }