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 ] 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 qdisc_util *q = NULL;
  47         struct tc_estimator est;
  48         char  d[16];
  49         char  k[16];
  50         struct {
  51                 struct nlmsghdr         n;
  52                 struct tcmsg            t;
  53                 char                    buf[TCA_BUF_MAX];
  54         } req;
  55
  56         memset(&req, 0, sizeof(req));
  57         memset(&est, 0, sizeof(est));
  58         memset(&d, 0, sizeof(d));
  59         memset(&k, 0, sizeof(k));
  60
  61         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
  62         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
  63         req.n.nlmsg_type = cmd;
  64         req.t.tcm_family = AF_UNSPEC;
  65
  66         while (argc > 0) {
  67                 if (strcmp(*argv, "dev") == 0) {
  68                         NEXT_ARG();
  69                         if (d[0])
  70                                 duparg("dev", *argv);
  71                         strncpy(d, *argv, sizeof(d)-1);
  72                 } else if (strcmp(*argv, "handle") == 0) {
  73                         __u32 handle;
  74                         if (req.t.tcm_handle)
  75                                 duparg("handle", *argv);
  76                         NEXT_ARG();
  77                         if (get_qdisc_handle(&handle, *argv))
  78                                 invarg(*argv, "invalid qdisc ID");
  79                         req.t.tcm_handle = handle;
  80                 } else if (strcmp(*argv, "root") == 0) {
  81                         if (req.t.tcm_parent) {
  82                                 fprintf(stderr, "Error: \"root\" is duplicate parent ID\n");
  83                                 return -1;
  84                         }
  85                         req.t.tcm_parent = TC_H_ROOT;
  86 #ifdef TC_H_INGRESS
  87                 } else if (strcmp(*argv, "ingress") == 0) {
  88                         if (req.t.tcm_parent) {
  89                                 fprintf(stderr, "Error: \"ingress\" is a duplicate parent ID\n");
  90                                 return -1;
  91                         }
  92                         req.t.tcm_parent = TC_H_INGRESS;
  93                         strncpy(k, "ingress", sizeof(k)-1);
  94                         q = get_qdisc_kind(k);
  95                         req.t.tcm_handle = 0xffff0000;
  96
  97                         argc--; argv++;
  98                         break;
  99 #endif
 100                 } else if (strcmp(*argv, "parent") == 0) {
 101                         __u32 handle;
 102                         NEXT_ARG();
 103                         if (req.t.tcm_parent)
 104                                 duparg("parent", *argv);
 105                         if (get_tc_classid(&handle, *argv))
 106                                 invarg(*argv, "invalid parent ID");
 107                         req.t.tcm_parent = handle;
 108                 } else if (matches(*argv, "estimator") == 0) {
 109                         if (parse_estimator(&argc, &argv, &est))
 110                                 return -1;
 111                 } else if (matches(*argv, "help") == 0) {
 112                         usage();
 113                 } else {
 114                         strncpy(k, *argv, sizeof(k)-1);
 115
 116                         q = get_qdisc_kind(k);
 117                         argc--; argv++;
 118                         break;
 119                 }
 120                 argc--; argv++;
 121         }
 122
 123         if (k[0])
 124                 addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
 125         if (est.ewma_log)
 126                 addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 127
 128         if (q) {
 129                 if (!q->parse_qopt) {
 130                         fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
 131                         return -1;
 132                 }
 133                 if (q->parse_qopt(q, argc, argv, &req.n))
 134                         return 1;
 135         } else {
 136                 if (argc) {
 137                         if (matches(*argv, "help") == 0)
 138                                 usage();
 139
 140                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 141                         return -1;
 142                 }
 143         }
 144
 145         if (d[0])  {
 146                 int idx;
 147
 148                 ll_init_map(&rth);
 149
 150                 if ((idx = ll_name_to_index(d)) == 0) {
 151                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 152                         return 1;
 153                 }
 154                 req.t.tcm_ifindex = idx;
 155         }
 156
 157         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 158                 return 2;
 159
 160         return 0;
 161 }
 162
 163 static int filter_ifindex;
 164
 165 int print_qdisc(const struct sockaddr_nl *who,
 166                        struct nlmsghdr *n,
 167                        void *arg)
 168 {
 169         FILE *fp = (FILE*)arg;
 170         struct tcmsg *t = NLMSG_DATA(n);
 171         int len = n->nlmsg_len;
 172         struct rtattr * tb[TCA_MAX+1];
 173         struct qdisc_util *q;
 174         char abuf[256];
 175
 176         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 177                 fprintf(stderr, "Not a qdisc\n");
 178                 return 0;
 179         }
 180         len -= NLMSG_LENGTH(sizeof(*t));
 181         if (len < 0) {
 182                 fprintf(stderr, "Wrong len %d\n", len);
 183                 return -1;
 184         }
 185
 186         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 187                 return 0;
 188
 189         memset(tb, 0, sizeof(tb));
 190         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 191
 192         if (tb[TCA_KIND] == NULL) {
 193                 fprintf(stderr, "print_qdisc: NULL kind\n");
 194                 return -1;
 195         }
 196
 197         if (n->nlmsg_type == RTM_DELQDISC)
 198                 fprintf(fp, "deleted ");
 199
 200         fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
 201         if (filter_ifindex == 0)
 202                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 203         if (t->tcm_parent == TC_H_ROOT)
 204                 fprintf(fp, "root ");
 205         else if (t->tcm_parent) {
 206                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 207                 fprintf(fp, "parent %s ", abuf);
 208         }
 209         if (t->tcm_info != 1) {
 210                 fprintf(fp, "refcnt %d ", t->tcm_info);
 211         }
 212         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 213
 214         if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
 215                 q = get_qdisc_kind("prio");
 216         else
 217                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 218
 219         if (tb[TCA_OPTIONS]) {
 220                 if (q)
 221                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 222                 else
 223                         fprintf(fp, "[cannot parse qdisc parameters]");
 224         }
 225         fprintf(fp, "\n");
 226         if (show_stats) {
 227                 struct rtattr *xstats = NULL;
 228
 229                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 230                         print_tcstats_attr(fp, tb, " ", &xstats);
 231                         fprintf(fp, "\n");
 232                 }
 233
 234                 if (q && xstats && q->print_xstats) {
 235                         q->print_xstats(q, fp, xstats);
 236                         fprintf(fp, "\n");
 237                 }
 238         }
 239         fflush(fp);
 240         return 0;
 241 }
 242
 243
 244 int tc_qdisc_list(int argc, char **argv)
 245 {
 246         struct tcmsg t;
 247         char d[16];
 248
 249         memset(&t, 0, sizeof(t));
 250         t.tcm_family = AF_UNSPEC;
 251         memset(&d, 0, sizeof(d));
 252
 253         while (argc > 0) {
 254                 if (strcmp(*argv, "dev") == 0) {
 255                         NEXT_ARG();
 256                         strncpy(d, *argv, sizeof(d)-1);
 257 #ifdef TC_H_INGRESS
 258                 } else if (strcmp(*argv, "ingress") == 0) {
 259                              if (t.tcm_parent) {
 260                                      fprintf(stderr, "Duplicate parent ID\n");
 261                                      usage();
 262                              }
 263                              t.tcm_parent = TC_H_INGRESS;
 264 #endif
 265                 } else if (matches(*argv, "help") == 0) {
 266                         usage();
 267                 } else {
 268                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 269                         return -1;
 270                 }
 271
 272                 argc--; argv++;
 273         }
 274
 275         ll_init_map(&rth);
 276
 277         if (d[0]) {
 278                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 279                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 280                         return 1;
 281                 }
 282                 filter_ifindex = t.tcm_ifindex;
 283         }
 284
 285         if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 286                 perror("Cannot send dump request");
 287                 return 1;
 288         }
 289
 290         if (rtnl_dump_filter(&rth, print_qdisc, stdout, NULL, NULL) < 0) {
 291                 fprintf(stderr, "Dump terminated\n");
 292                 return 1;
 293         }
 294
 295         return 0;
 296 }
 297
 298 int do_qdisc(int argc, char **argv)
 299 {
 300         if (argc < 1)
 301                 return tc_qdisc_list(0, NULL);
 302         if (matches(*argv, "add") == 0)
 303                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 304         if (matches(*argv, "change") == 0)
 305                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 306         if (matches(*argv, "replace") == 0)
 307                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 308         if (matches(*argv, "link") == 0)
 309                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 310         if (matches(*argv, "delete") == 0)
 311                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 312 #if 0
 313         if (matches(*argv, "get") == 0)
 314                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 315 #endif
 316         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 317             || matches(*argv, "lst") == 0)
 318                 return tc_qdisc_list(argc-1, argv+1);
 319         if (matches(*argv, "help") == 0)
 320                 usage();
 321         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 322         return -1;
 323 }