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 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(q, argc, argv, &req.n))
 130                         return 1;
 131         } else {
 132                 if (argc) {
 133                         if (matches(*argv, "help") == 0)
 134                                 usage();
 135
 136                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". Try \"tc qdisc help\".\n", *argv);
 137                         return -1;
 138                 }
 139         }
 140
 141         if (d[0])  {
 142                 int idx;
 143
 144                 ll_init_map(&rth);
 145
 146                 if ((idx = ll_name_to_index(d)) == 0) {
 147                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 148                         return 1;
 149                 }
 150                 req.t.tcm_ifindex = idx;
 151         }
 152
 153         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 154                 return 2;
 155
 156         return 0;
 157 }
 158
 159 static int filter_ifindex;
 160
 161 static int print_qdisc(const struct sockaddr_nl *who,
 162                        struct nlmsghdr *n,
 163                        void *arg)
 164 {
 165         FILE *fp = (FILE*)arg;
 166         struct tcmsg *t = NLMSG_DATA(n);
 167         int len = n->nlmsg_len;
 168         struct rtattr * tb[TCA_MAX+1];
 169         struct qdisc_util *q;
 170         char abuf[256];
 171
 172         if (n->nlmsg_type != RTM_NEWQDISC && n->nlmsg_type != RTM_DELQDISC) {
 173                 fprintf(stderr, "Not a qdisc\n");
 174                 return 0;
 175         }
 176         len -= NLMSG_LENGTH(sizeof(*t));
 177         if (len < 0) {
 178                 fprintf(stderr, "Wrong len %d\n", len);
 179                 return -1;
 180         }
 181
 182         if (filter_ifindex && filter_ifindex != t->tcm_ifindex)
 183                 return 0;
 184
 185         memset(tb, 0, sizeof(tb));
 186         parse_rtattr(tb, TCA_MAX, TCA_RTA(t), len);
 187
 188         if (tb[TCA_KIND] == NULL) {
 189                 fprintf(stderr, "print_qdisc: NULL kind\n");
 190                 return -1;
 191         }
 192
 193         if (n->nlmsg_type == RTM_DELQDISC)
 194                 fprintf(fp, "deleted ");
 195
 196         fprintf(fp, "qdisc %s %x: ", (char*)RTA_DATA(tb[TCA_KIND]), t->tcm_handle>>16);
 197         if (filter_ifindex == 0)
 198                 fprintf(fp, "dev %s ", ll_index_to_name(t->tcm_ifindex));
 199         if (t->tcm_parent == TC_H_ROOT)
 200                 fprintf(fp, "root ");
 201         else if (t->tcm_parent) {
 202                 print_tc_classid(abuf, sizeof(abuf), t->tcm_parent);
 203                 fprintf(fp, "parent %s ", abuf);
 204         }
 205         if (t->tcm_info != 1) {
 206                 fprintf(fp, "refcnt %d ", t->tcm_info);
 207         }
 208         /* pfifo_fast is generic enough to warrant the hardcoding --JHS */
 209
 210         if (0 == strcmp("pfifo_fast", RTA_DATA(tb[TCA_KIND])))
 211                 q = get_qdisc_kind("prio");
 212         else
 213                 q = get_qdisc_kind(RTA_DATA(tb[TCA_KIND]));
 214
 215         if (tb[TCA_OPTIONS]) {
 216                 if (q)
 217                         q->print_qopt(q, fp, tb[TCA_OPTIONS]);
 218                 else
 219                         fprintf(fp, "[cannot parse qdisc parameters]");
 220         }
 221         fprintf(fp, "\n");
 222         if (show_stats) {
 223                 struct rtattr *xstats = NULL;
 224
 225                 if (tb[TCA_STATS] || tb[TCA_STATS2] || tb[TCA_XSTATS]) {
 226                         print_tcstats_attr(fp, tb, " ", &xstats);
 227                         fprintf(fp, "\n");
 228                 }
 229
 230                 if (q && xstats && q->print_xstats) {
 231                         q->print_xstats(q, fp, xstats);
 232                         fprintf(fp, "\n");
 233                 }
 234         }
 235         fflush(fp);
 236         return 0;
 237 }
 238
 239
 240 int tc_qdisc_list(int argc, char **argv)
 241 {
 242         struct tcmsg t;
 243         char d[16];
 244
 245         memset(&t, 0, sizeof(t));
 246         t.tcm_family = AF_UNSPEC;
 247         memset(&d, 0, sizeof(d));
 248
 249         while (argc > 0) {
 250                 if (strcmp(*argv, "dev") == 0) {
 251                         NEXT_ARG();
 252                         strncpy(d, *argv, sizeof(d)-1);
 253 #ifdef TC_H_INGRESS
 254                 } else if (strcmp(*argv, "ingress") == 0) {
 255                              if (t.tcm_parent) {
 256                                      fprintf(stderr, "Duplicate parent ID\n");
 257                                      usage();
 258                              }
 259                              t.tcm_parent = TC_H_INGRESS;
 260 #endif
 261                 } else if (matches(*argv, "help") == 0) {
 262                         usage();
 263                 } else {
 264                         fprintf(stderr, "What is \"%s\"? Try \"tc qdisc help\".\n", *argv);
 265                         return -1;
 266                 }
 267
 268                 argc--; argv++;
 269         }
 270
 271         ll_init_map(&rth);
 272
 273         if (d[0]) {
 274                 if ((t.tcm_ifindex = ll_name_to_index(d)) == 0) {
 275                         fprintf(stderr, "Cannot find device \"%s\"\n", d);
 276                         return 1;
 277                 }
 278                 filter_ifindex = t.tcm_ifindex;
 279         }
 280
 281         if (rtnl_dump_request(&rth, RTM_GETQDISC, &t, sizeof(t)) < 0) {
 282                 perror("Cannot send dump request");
 283                 return 1;
 284         }
 285
 286         if (rtnl_dump_filter(&rth, print_qdisc, stdout, NULL, NULL) < 0) {
 287                 fprintf(stderr, "Dump terminated\n");
 288                 return 1;
 289         }
 290
 291         return 0;
 292 }
 293
 294 int do_qdisc(int argc, char **argv)
 295 {
 296         if (argc < 1)
 297                 return tc_qdisc_list(0, NULL);
 298         if (matches(*argv, "add") == 0)
 299                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_EXCL|NLM_F_CREATE, argc-1, argv+1);
 300         if (matches(*argv, "change") == 0)
 301                 return tc_qdisc_modify(RTM_NEWQDISC, 0, argc-1, argv+1);
 302         if (matches(*argv, "replace") == 0)
 303                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
 304         if (matches(*argv, "link") == 0)
 305                 return tc_qdisc_modify(RTM_NEWQDISC, NLM_F_REPLACE, argc-1, argv+1);
 306         if (matches(*argv, "delete") == 0)
 307                 return tc_qdisc_modify(RTM_DELQDISC, 0,  argc-1, argv+1);
 308 #if 0
 309         if (matches(*argv, "get") == 0)
 310                 return tc_qdisc_get(RTM_GETQDISC, 0,  argc-1, argv+1);
 311 #endif
 312         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 313             || matches(*argv, "lst") == 0)
 314                 return tc_qdisc_list(argc-1, argv+1);
 315         if (matches(*argv, "help") == 0)
 316                 usage();
 317         fprintf(stderr, "Command \"%s\" is unknown, try \"tc qdisc help\".\n", *argv);
 318         return -1;
 319 }