tc/q_tbf.c

   1 /*
   2  * q_tbf.c              TBF.
   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  *
  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
  23 #include "utils.h"
  24 #include "tc_util.h"
  25
  26 static void explain(void)
  27 {
  28         fprintf(stderr, "Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n");
  29         fprintf(stderr, "               [ peakrate KBPS ] [ latency TIME ] ");
  30         fprintf(stderr, "[ overhead BYTES ] [ linklayer TYPE ]\n");
  31 }
  32
  33 static void explain1(const char *arg, const char *val)
  34 {
  35         fprintf(stderr, "tbf: illegal value for \"%s\": \"%s\"\n", arg, val);
  36 }
  37
  38
  39 static int tbf_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
  40 {
  41         int ok=0;
  42         struct tc_tbf_qopt opt;
  43         __u32 rtab[256];
  44         __u32 ptab[256];
  45         unsigned buffer=0, mtu=0, mpu=0, latency=0;
  46         int Rcell_log=-1, Pcell_log = -1;
  47         unsigned short overhead=0;
  48         unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
  49         struct rtattr *tail;
  50
  51         memset(&opt, 0, sizeof(opt));
  52
  53         while (argc > 0) {
  54                 if (matches(*argv, "limit") == 0) {
  55                         NEXT_ARG();
  56                         if (opt.limit) {
  57                                 fprintf(stderr, "tbf: duplicate \"limit\" specification\n");
  58                                 return -1;
  59                         }
  60                         if (latency) {
  61                                 fprintf(stderr, "tbf: specifying both \"latency\" and \"limit\" is not allowed\n");
  62                                 return -1;
  63                         }
  64                         if (get_size(&opt.limit, *argv)) {
  65                                 explain1("limit", *argv);
  66                                 return -1;
  67                         }
  68                         ok++;
  69                 } else if (matches(*argv, "latency") == 0) {
  70                         NEXT_ARG();
  71                         if (latency) {
  72                                 fprintf(stderr, "tbf: duplicate \"latency\" specification\n");
  73                                 return -1;
  74                         }
  75                         if (opt.limit) {
  76                                 fprintf(stderr, "tbf: specifying both \"limit\" and \"/latency\" is not allowed\n");
  77                                 return -1;
  78                         }
  79                         if (get_time(&latency, *argv)) {
  80                                 explain1("latency", *argv);
  81                                 return -1;
  82                         }
  83                         ok++;
  84                 } else if (matches(*argv, "burst") == 0 ||
  85                         strcmp(*argv, "buffer") == 0 ||
  86                         strcmp(*argv, "maxburst") == 0) {
  87                         const char *parm_name = *argv;
  88                         NEXT_ARG();
  89                         if (buffer) {
  90                                 fprintf(stderr, "tbf: duplicate \"buffer/burst/maxburst\" specification\n");
  91                                 return -1;
  92                         }
  93                         if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
  94                                 explain1(parm_name, *argv);
  95                                 return -1;
  96                         }
  97                         ok++;
  98                 } else if (strcmp(*argv, "mtu") == 0 ||
  99                            strcmp(*argv, "minburst") == 0) {
 100                         const char *parm_name = *argv;
 101                         NEXT_ARG();
 102                         if (mtu) {
 103                                 fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
 104                                 return -1;
 105                         }
 106                         if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
 107                                 explain1(parm_name, *argv);
 108                                 return -1;
 109                         }
 110                         ok++;
 111                 } else if (strcmp(*argv, "mpu") == 0) {
 112                         NEXT_ARG();
 113                         if (mpu) {
 114                                 fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
 115                                 return -1;
 116                         }
 117                         if (get_size(&mpu, *argv)) {
 118                                 explain1("mpu", *argv);
 119                                 return -1;
 120                         }
 121                         ok++;
 122                 } else if (strcmp(*argv, "rate") == 0) {
 123                         NEXT_ARG();
 124                         if (opt.rate.rate) {
 125                                 fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
 126                                 return -1;
 127                         }
 128                         if (get_rate(&opt.rate.rate, *argv)) {
 129                                 explain1("rate", *argv);
 130                                 return -1;
 131                         }
 132                         ok++;
 133                 } else if (matches(*argv, "peakrate") == 0) {
 134                         NEXT_ARG();
 135                         if (opt.peakrate.rate) {
 136                                 fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
 137                                 return -1;
 138                         }
 139                         if (get_rate(&opt.peakrate.rate, *argv)) {
 140                                 explain1("peakrate", *argv);
 141                                 return -1;
 142                         }
 143                         ok++;
 144                 } else if (matches(*argv, "overhead") == 0) {
 145                         NEXT_ARG();
 146                         if (overhead) {
 147                                 fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
 148                                 return -1;
 149                         }
 150                         if (get_u16(&overhead, *argv, 10)) {
 151                                 explain1("overhead", *argv); return -1;
 152                         }
 153                 } else if (matches(*argv, "linklayer") == 0) {
 154                         NEXT_ARG();
 155                         if (get_linklayer(&linklayer, *argv)) {
 156                                 explain1("linklayer", *argv); return -1;
 157                         }
 158                 } else if (strcmp(*argv, "help") == 0) {
 159                         explain();
 160                         return -1;
 161                 } else {
 162                         fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
 163                         explain();
 164                         return -1;
 165                 }
 166                 argc--; argv++;
 167         }
 168
 169         int verdict = 0;
 170
 171         /* Be nice to the user: try to emit all error messages in
 172          * one go rather than reveal one more problem when a
 173          * previous one has been fixed.
 174          */
 175         if (opt.rate.rate == 0) {
 176                 fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
 177                 verdict = -1;
 178         }
 179         if (!buffer) {
 180                 fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
 181                 verdict = -1;
 182         }
 183         if (opt.peakrate.rate) {
 184                 if (!mtu) {
 185                         fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
 186                         verdict = -1;
 187                 }
 188         }
 189
 190         if (opt.limit == 0 && latency == 0) {
 191                 fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
 192                 verdict = -1;
 193         }
 194
 195         if (verdict != 0) {
 196                 explain();
 197                 return verdict;
 198         }
 199
 200         if (opt.limit == 0) {
 201                 double lim = opt.rate.rate*(double)latency/TIME_UNITS_PER_SEC + buffer;
 202                 if (opt.peakrate.rate) {
 203                         double lim2 = opt.peakrate.rate*(double)latency/TIME_UNITS_PER_SEC + mtu;
 204                         if (lim2 < lim)
 205                                 lim = lim2;
 206                 }
 207                 opt.limit = lim;
 208         }
 209
 210         opt.rate.mpu      = mpu;
 211         opt.rate.overhead = overhead;
 212         if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
 213                 fprintf(stderr, "tbf: failed to calculate rate table.\n");
 214                 return -1;
 215         }
 216         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 217
 218         if (opt.peakrate.rate) {
 219                 opt.peakrate.mpu      = mpu;
 220                 opt.peakrate.overhead = overhead;
 221                 if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
 222                         fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
 223                         return -1;
 224                 }
 225                 opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
 226         }
 227
 228         tail = NLMSG_TAIL(n);
 229         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 230         addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
 231         addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
 232         if (opt.peakrate.rate)
 233                 addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
 234         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 235         return 0;
 236 }
 237
 238 static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 239 {
 240         struct rtattr *tb[TCA_TBF_PTAB+1];
 241         struct tc_tbf_qopt *qopt;
 242         double buffer, mtu;
 243         double latency;
 244         SPRINT_BUF(b1);
 245         SPRINT_BUF(b2);
 246
 247         if (opt == NULL)
 248                 return 0;
 249
 250         parse_rtattr_nested(tb, TCA_TBF_PTAB, opt);
 251
 252         if (tb[TCA_TBF_PARMS] == NULL)
 253                 return -1;
 254
 255         qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
 256         if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
 257                 return -1;
 258         fprintf(f, "rate %s ", sprint_rate(qopt->rate.rate, b1));
 259         buffer = tc_calc_xmitsize(qopt->rate.rate, qopt->buffer);
 260         if (show_details) {
 261                 fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
 262                         1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
 263         } else {
 264                 fprintf(f, "burst %s ", sprint_size(buffer, b1));
 265         }
 266         if (show_raw)
 267                 fprintf(f, "[%08x] ", qopt->buffer);
 268         if (qopt->peakrate.rate) {
 269                 fprintf(f, "peakrate %s ", sprint_rate(qopt->peakrate.rate, b1));
 270                 if (qopt->mtu || qopt->peakrate.mpu) {
 271                         mtu = tc_calc_xmitsize(qopt->peakrate.rate, qopt->mtu);
 272                         if (show_details) {
 273                                 fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
 274                                         1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
 275                         } else {
 276                                 fprintf(f, "minburst %s ", sprint_size(mtu, b1));
 277                         }
 278                         if (show_raw)
 279                                 fprintf(f, "[%08x] ", qopt->mtu);
 280                 }
 281         }
 282
 283         if (show_raw)
 284                 fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
 285
 286         latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)qopt->rate.rate) - tc_core_tick2time(qopt->buffer);
 287         if (qopt->peakrate.rate) {
 288                 double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)qopt->peakrate.rate) - tc_core_tick2time(qopt->mtu);
 289                 if (lat2 > latency)
 290                         latency = lat2;
 291         }
 292         fprintf(f, "lat %s ", sprint_time(latency, b1));
 293
 294         if (qopt->rate.overhead) {
 295                 fprintf(f, "overhead %d", qopt->rate.overhead);
 296         }
 297
 298         return 0;
 299 }
 300
 301 struct qdisc_util tbf_qdisc_util = {
 302         .id             = "tbf",
 303         .parse_qopt     = tbf_parse_opt,
 304         .print_qopt     = tbf_print_opt,
 305 };
 306