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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24
  25 static void explain(void)
  26 {
  27         fprintf(stderr,
  28                 "Usage: ... tbf limit BYTES burst BYTES[/BYTES] rate KBPS [ mtu BYTES[/BYTES] ]\n"
  29                 "       [ peakrate KBPS ] [ latency TIME ] "
  30                 "[ 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,
  40                          struct nlmsghdr *n, const char *dev)
  41 {
  42         int ok = 0;
  43         struct tc_tbf_qopt opt = {};
  44         __u32 rtab[256];
  45         __u32 ptab[256];
  46         unsigned buffer = 0, mtu = 0, mpu = 0, latency = 0;
  47         int Rcell_log =  -1, Pcell_log = -1;
  48         unsigned short overhead = 0;
  49         unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */
  50         struct rtattr *tail;
  51         __u64 rate64 = 0, prate64 = 0;
  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
  89                         NEXT_ARG();
  90                         if (buffer) {
  91                                 fprintf(stderr, "tbf: duplicate \"buffer/burst/maxburst\" specification\n");
  92                                 return -1;
  93                         }
  94                         if (get_size_and_cell(&buffer, &Rcell_log, *argv) < 0) {
  95                                 explain1(parm_name, *argv);
  96                                 return -1;
  97                         }
  98                         ok++;
  99                 } else if (strcmp(*argv, "mtu") == 0 ||
 100                            strcmp(*argv, "minburst") == 0) {
 101                         const char *parm_name = *argv;
 102
 103                         NEXT_ARG();
 104                         if (mtu) {
 105                                 fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
 106                                 return -1;
 107                         }
 108                         if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
 109                                 explain1(parm_name, *argv);
 110                                 return -1;
 111                         }
 112                         ok++;
 113                 } else if (strcmp(*argv, "mpu") == 0) {
 114                         NEXT_ARG();
 115                         if (mpu) {
 116                                 fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
 117                                 return -1;
 118                         }
 119                         if (get_size(&mpu, *argv)) {
 120                                 explain1("mpu", *argv);
 121                                 return -1;
 122                         }
 123                         ok++;
 124                 } else if (strcmp(*argv, "rate") == 0) {
 125                         NEXT_ARG();
 126                         if (rate64) {
 127                                 fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
 128                                 return -1;
 129                         }
 130                         if (strchr(*argv, '%')) {
 131                                 if (get_percent_rate64(&rate64, *argv, dev)) {
 132                                         explain1("rate", *argv);
 133                                         return -1;
 134                                 }
 135                         } else if (get_rate64(&rate64, *argv)) {
 136                                 explain1("rate", *argv);
 137                                 return -1;
 138                         }
 139                         ok++;
 140                 } else if (matches(*argv, "peakrate") == 0) {
 141                         NEXT_ARG();
 142                         if (prate64) {
 143                                 fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
 144                                 return -1;
 145                         }
 146                         if (strchr(*argv, '%')) {
 147                                 if (get_percent_rate64(&prate64, *argv, dev)) {
 148                                         explain1("peakrate", *argv);
 149                                         return -1;
 150                                 }
 151                         } else if (get_rate64(&prate64, *argv)) {
 152                                 explain1("peakrate", *argv);
 153                                 return -1;
 154                         }
 155                         ok++;
 156                 } else if (matches(*argv, "overhead") == 0) {
 157                         NEXT_ARG();
 158                         if (overhead) {
 159                                 fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
 160                                 return -1;
 161                         }
 162                         if (get_u16(&overhead, *argv, 10)) {
 163                                 explain1("overhead", *argv); return -1;
 164                         }
 165                 } else if (matches(*argv, "linklayer") == 0) {
 166                         NEXT_ARG();
 167                         if (get_linklayer(&linklayer, *argv)) {
 168                                 explain1("linklayer", *argv); return -1;
 169                         }
 170                 } else if (strcmp(*argv, "help") == 0) {
 171                         explain();
 172                         return -1;
 173                 } else {
 174                         fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
 175                         explain();
 176                         return -1;
 177                 }
 178                 argc--; argv++;
 179         }
 180
 181         int verdict = 0;
 182
 183         /* Be nice to the user: try to emit all error messages in
 184          * one go rather than reveal one more problem when a
 185          * previous one has been fixed.
 186          */
 187         if (rate64 == 0) {
 188                 fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
 189                 verdict = -1;
 190         }
 191         if (!buffer) {
 192                 fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
 193                 verdict = -1;
 194         }
 195         if (prate64) {
 196                 if (!mtu) {
 197                         fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
 198                         verdict = -1;
 199                 }
 200         }
 201
 202         if (opt.limit == 0 && latency == 0) {
 203                 fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
 204                 verdict = -1;
 205         }
 206
 207         if (verdict != 0) {
 208                 explain();
 209                 return verdict;
 210         }
 211
 212         opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
 213         opt.peakrate.rate = (prate64 >= (1ULL << 32)) ? ~0U : prate64;
 214
 215         if (opt.limit == 0) {
 216                 double lim = rate64*(double)latency/TIME_UNITS_PER_SEC + buffer;
 217
 218                 if (prate64) {
 219                         double lim2 = prate64*(double)latency/TIME_UNITS_PER_SEC + mtu;
 220
 221                         if (lim2 < lim)
 222                                 lim = lim2;
 223                 }
 224                 opt.limit = lim;
 225         }
 226
 227         opt.rate.mpu      = mpu;
 228         opt.rate.overhead = overhead;
 229         if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
 230                 fprintf(stderr, "tbf: failed to calculate rate table.\n");
 231                 return -1;
 232         }
 233         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 234
 235         if (opt.peakrate.rate) {
 236                 opt.peakrate.mpu      = mpu;
 237                 opt.peakrate.overhead = overhead;
 238                 if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
 239                         fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
 240                         return -1;
 241                 }
 242                 opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
 243         }
 244
 245         tail = addattr_nest(n, 1024, TCA_OPTIONS);
 246         addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
 247         addattr_l(n, 2124, TCA_TBF_BURST, &buffer, sizeof(buffer));
 248         if (rate64 >= (1ULL << 32))
 249                 addattr_l(n, 2124, TCA_TBF_RATE64, &rate64, sizeof(rate64));
 250         addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
 251         if (opt.peakrate.rate) {
 252                 if (prate64 >= (1ULL << 32))
 253                         addattr_l(n, 3124, TCA_TBF_PRATE64, &prate64, sizeof(prate64));
 254                 addattr_l(n, 3224, TCA_TBF_PBURST, &mtu, sizeof(mtu));
 255                 addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
 256         }
 257         addattr_nest_end(n, tail);
 258         return 0;
 259 }
 260
 261 static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 262 {
 263         struct rtattr *tb[TCA_TBF_MAX+1];
 264         struct tc_tbf_qopt *qopt;
 265         unsigned int linklayer;
 266         double buffer, mtu;
 267         double latency;
 268         __u64 rate64 = 0, prate64 = 0;
 269
 270         SPRINT_BUF(b1);
 271         SPRINT_BUF(b2);
 272         SPRINT_BUF(b3);
 273
 274         if (opt == NULL)
 275                 return 0;
 276
 277         parse_rtattr_nested(tb, TCA_TBF_MAX, opt);
 278
 279         if (tb[TCA_TBF_PARMS] == NULL)
 280                 return -1;
 281
 282         qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
 283         if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
 284                 return -1;
 285         rate64 = qopt->rate.rate;
 286         if (tb[TCA_TBF_RATE64] &&
 287             RTA_PAYLOAD(tb[TCA_TBF_RATE64]) >= sizeof(rate64))
 288                 rate64 = rta_getattr_u64(tb[TCA_TBF_RATE64]);
 289         fprintf(f, "rate %s ", sprint_rate(rate64, b1));
 290         buffer = tc_calc_xmitsize(rate64, qopt->buffer);
 291         if (show_details) {
 292                 fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
 293                         1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
 294         } else {
 295                 fprintf(f, "burst %s ", sprint_size(buffer, b1));
 296         }
 297         if (show_raw)
 298                 fprintf(f, "[%08x] ", qopt->buffer);
 299         prate64 = qopt->peakrate.rate;
 300         if (tb[TCA_TBF_PRATE64] &&
 301             RTA_PAYLOAD(tb[TCA_TBF_PRATE64]) >= sizeof(prate64))
 302                 prate64 = rta_getattr_u64(tb[TCA_TBF_PRATE64]);
 303         if (prate64) {
 304                 fprintf(f, "peakrate %s ", sprint_rate(prate64, b1));
 305                 if (qopt->mtu || qopt->peakrate.mpu) {
 306                         mtu = tc_calc_xmitsize(prate64, qopt->mtu);
 307                         if (show_details) {
 308                                 fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
 309                                         1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
 310                         } else {
 311                                 fprintf(f, "minburst %s ", sprint_size(mtu, b1));
 312                         }
 313                         if (show_raw)
 314                                 fprintf(f, "[%08x] ", qopt->mtu);
 315                 }
 316         }
 317
 318         latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)rate64) - tc_core_tick2time(qopt->buffer);
 319         if (prate64) {
 320                 double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)prate64) - tc_core_tick2time(qopt->mtu);
 321
 322                 if (lat2 > latency)
 323                         latency = lat2;
 324         }
 325         if (latency >= 0.0)
 326                 fprintf(f, "lat %s ", sprint_time(latency, b1));
 327         if (show_raw || latency < 0.0)
 328                 fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
 329
 330         if (qopt->rate.overhead) {
 331                 fprintf(f, "overhead %d", qopt->rate.overhead);
 332         }
 333         linklayer = (qopt->rate.linklayer & TC_LINKLAYER_MASK);
 334         if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 335                 fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));
 336
 337         return 0;
 338 }
 339
 340 struct qdisc_util tbf_qdisc_util = {
 341         .id             = "tbf",
 342         .parse_qopt     = tbf_parse_opt,
 343         .print_qopt     = tbf_print_opt,
 344 };