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         __u64 rate64 = 0, prate64 = 0;
  51
  52         while (argc > 0) {
  53                 if (matches(*argv, "limit") == 0) {
  54                         NEXT_ARG();
  55                         if (opt.limit) {
  56                                 fprintf(stderr, "tbf: duplicate \"limit\" specification\n");
  57                                 return -1;
  58                         }
  59                         if (latency) {
  60                                 fprintf(stderr, "tbf: specifying both \"latency\" and \"limit\" is not allowed\n");
  61                                 return -1;
  62                         }
  63                         if (get_size(&opt.limit, *argv)) {
  64                                 explain1("limit", *argv);
  65                                 return -1;
  66                         }
  67                         ok++;
  68                 } else if (matches(*argv, "latency") == 0) {
  69                         NEXT_ARG();
  70                         if (latency) {
  71                                 fprintf(stderr, "tbf: duplicate \"latency\" specification\n");
  72                                 return -1;
  73                         }
  74                         if (opt.limit) {
  75                                 fprintf(stderr, "tbf: specifying both \"limit\" and \"/latency\" is not allowed\n");
  76                                 return -1;
  77                         }
  78                         if (get_time(&latency, *argv)) {
  79                                 explain1("latency", *argv);
  80                                 return -1;
  81                         }
  82                         ok++;
  83                 } else if (matches(*argv, "burst") == 0 ||
  84                         strcmp(*argv, "buffer") == 0 ||
  85                         strcmp(*argv, "maxburst") == 0) {
  86                         const char *parm_name = *argv;
  87
  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
 102                         NEXT_ARG();
 103                         if (mtu) {
 104                                 fprintf(stderr, "tbf: duplicate \"mtu/minburst\" specification\n");
 105                                 return -1;
 106                         }
 107                         if (get_size_and_cell(&mtu, &Pcell_log, *argv) < 0) {
 108                                 explain1(parm_name, *argv);
 109                                 return -1;
 110                         }
 111                         ok++;
 112                 } else if (strcmp(*argv, "mpu") == 0) {
 113                         NEXT_ARG();
 114                         if (mpu) {
 115                                 fprintf(stderr, "tbf: duplicate \"mpu\" specification\n");
 116                                 return -1;
 117                         }
 118                         if (get_size(&mpu, *argv)) {
 119                                 explain1("mpu", *argv);
 120                                 return -1;
 121                         }
 122                         ok++;
 123                 } else if (strcmp(*argv, "rate") == 0) {
 124                         NEXT_ARG();
 125                         if (rate64) {
 126                                 fprintf(stderr, "tbf: duplicate \"rate\" specification\n");
 127                                 return -1;
 128                         }
 129                         if (get_rate64(&rate64, *argv)) {
 130                                 explain1("rate", *argv);
 131                                 return -1;
 132                         }
 133                         ok++;
 134                 } else if (matches(*argv, "peakrate") == 0) {
 135                         NEXT_ARG();
 136                         if (prate64) {
 137                                 fprintf(stderr, "tbf: duplicate \"peakrate\" specification\n");
 138                                 return -1;
 139                         }
 140                         if (get_rate64(&prate64, *argv)) {
 141                                 explain1("peakrate", *argv);
 142                                 return -1;
 143                         }
 144                         ok++;
 145                 } else if (matches(*argv, "overhead") == 0) {
 146                         NEXT_ARG();
 147                         if (overhead) {
 148                                 fprintf(stderr, "tbf: duplicate \"overhead\" specification\n");
 149                                 return -1;
 150                         }
 151                         if (get_u16(&overhead, *argv, 10)) {
 152                                 explain1("overhead", *argv); return -1;
 153                         }
 154                 } else if (matches(*argv, "linklayer") == 0) {
 155                         NEXT_ARG();
 156                         if (get_linklayer(&linklayer, *argv)) {
 157                                 explain1("linklayer", *argv); return -1;
 158                         }
 159                 } else if (strcmp(*argv, "help") == 0) {
 160                         explain();
 161                         return -1;
 162                 } else {
 163                         fprintf(stderr, "tbf: unknown parameter \"%s\"\n", *argv);
 164                         explain();
 165                         return -1;
 166                 }
 167                 argc--; argv++;
 168         }
 169
 170         int verdict = 0;
 171
 172         /* Be nice to the user: try to emit all error messages in
 173          * one go rather than reveal one more problem when a
 174          * previous one has been fixed.
 175          */
 176         if (rate64 == 0) {
 177                 fprintf(stderr, "tbf: the \"rate\" parameter is mandatory.\n");
 178                 verdict = -1;
 179         }
 180         if (!buffer) {
 181                 fprintf(stderr, "tbf: the \"burst\" parameter is mandatory.\n");
 182                 verdict = -1;
 183         }
 184         if (prate64) {
 185                 if (!mtu) {
 186                         fprintf(stderr, "tbf: when \"peakrate\" is specified, \"mtu\" must also be specified.\n");
 187                         verdict = -1;
 188                 }
 189         }
 190
 191         if (opt.limit == 0 && latency == 0) {
 192                 fprintf(stderr, "tbf: either \"limit\" or \"latency\" is required.\n");
 193                 verdict = -1;
 194         }
 195
 196         if (verdict != 0) {
 197                 explain();
 198                 return verdict;
 199         }
 200
 201         opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64;
 202         opt.peakrate.rate = (prate64 >= (1ULL << 32)) ? ~0U : prate64;
 203
 204         if (opt.limit == 0) {
 205                 double lim = rate64*(double)latency/TIME_UNITS_PER_SEC + buffer;
 206
 207                 if (prate64) {
 208                         double lim2 = prate64*(double)latency/TIME_UNITS_PER_SEC + mtu;
 209
 210                         if (lim2 < lim)
 211                                 lim = lim2;
 212                 }
 213                 opt.limit = lim;
 214         }
 215
 216         opt.rate.mpu      = mpu;
 217         opt.rate.overhead = overhead;
 218         if (tc_calc_rtable(&opt.rate, rtab, Rcell_log, mtu, linklayer) < 0) {
 219                 fprintf(stderr, "tbf: failed to calculate rate table.\n");
 220                 return -1;
 221         }
 222         opt.buffer = tc_calc_xmittime(opt.rate.rate, buffer);
 223
 224         if (opt.peakrate.rate) {
 225                 opt.peakrate.mpu      = mpu;
 226                 opt.peakrate.overhead = overhead;
 227                 if (tc_calc_rtable(&opt.peakrate, ptab, Pcell_log, mtu, linklayer) < 0) {
 228                         fprintf(stderr, "tbf: failed to calculate peak rate table.\n");
 229                         return -1;
 230                 }
 231                 opt.mtu = tc_calc_xmittime(opt.peakrate.rate, mtu);
 232         }
 233
 234         tail = NLMSG_TAIL(n);
 235         addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
 236         addattr_l(n, 2024, TCA_TBF_PARMS, &opt, sizeof(opt));
 237         addattr_l(n, 2124, TCA_TBF_BURST, &buffer, sizeof(buffer));
 238         if (rate64 >= (1ULL << 32))
 239                 addattr_l(n, 2124, TCA_TBF_RATE64, &rate64, sizeof(rate64));
 240         addattr_l(n, 3024, TCA_TBF_RTAB, rtab, 1024);
 241         if (opt.peakrate.rate) {
 242                 if (prate64 >= (1ULL << 32))
 243                         addattr_l(n, 3124, TCA_TBF_PRATE64, &prate64, sizeof(prate64));
 244                 addattr_l(n, 3224, TCA_TBF_PBURST, &mtu, sizeof(mtu));
 245                 addattr_l(n, 4096, TCA_TBF_PTAB, ptab, 1024);
 246         }
 247         tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
 248         return 0;
 249 }
 250
 251 static int tbf_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 252 {
 253         struct rtattr *tb[TCA_TBF_MAX+1];
 254         struct tc_tbf_qopt *qopt;
 255         unsigned int linklayer;
 256         double buffer, mtu;
 257         double latency;
 258         __u64 rate64 = 0, prate64 = 0;
 259
 260         SPRINT_BUF(b1);
 261         SPRINT_BUF(b2);
 262         SPRINT_BUF(b3);
 263
 264         if (opt == NULL)
 265                 return 0;
 266
 267         parse_rtattr_nested(tb, TCA_TBF_MAX, opt);
 268
 269         if (tb[TCA_TBF_PARMS] == NULL)
 270                 return -1;
 271
 272         qopt = RTA_DATA(tb[TCA_TBF_PARMS]);
 273         if (RTA_PAYLOAD(tb[TCA_TBF_PARMS])  < sizeof(*qopt))
 274                 return -1;
 275         rate64 = qopt->rate.rate;
 276         if (tb[TCA_TBF_RATE64] &&
 277             RTA_PAYLOAD(tb[TCA_TBF_RATE64]) >= sizeof(rate64))
 278                 rate64 = rta_getattr_u64(tb[TCA_TBF_RATE64]);
 279         fprintf(f, "rate %s ", sprint_rate(rate64, b1));
 280         buffer = tc_calc_xmitsize(rate64, qopt->buffer);
 281         if (show_details) {
 282                 fprintf(f, "burst %s/%u mpu %s ", sprint_size(buffer, b1),
 283                         1<<qopt->rate.cell_log, sprint_size(qopt->rate.mpu, b2));
 284         } else {
 285                 fprintf(f, "burst %s ", sprint_size(buffer, b1));
 286         }
 287         if (show_raw)
 288                 fprintf(f, "[%08x] ", qopt->buffer);
 289         prate64 = qopt->peakrate.rate;
 290         if (tb[TCA_TBF_PRATE64] &&
 291             RTA_PAYLOAD(tb[TCA_TBF_PRATE64]) >= sizeof(prate64))
 292                 prate64 = rta_getattr_u64(tb[TCA_TBF_PRATE64]);
 293         if (prate64) {
 294                 fprintf(f, "peakrate %s ", sprint_rate(prate64, b1));
 295                 if (qopt->mtu || qopt->peakrate.mpu) {
 296                         mtu = tc_calc_xmitsize(prate64, qopt->mtu);
 297                         if (show_details) {
 298                                 fprintf(f, "mtu %s/%u mpu %s ", sprint_size(mtu, b1),
 299                                         1<<qopt->peakrate.cell_log, sprint_size(qopt->peakrate.mpu, b2));
 300                         } else {
 301                                 fprintf(f, "minburst %s ", sprint_size(mtu, b1));
 302                         }
 303                         if (show_raw)
 304                                 fprintf(f, "[%08x] ", qopt->mtu);
 305                 }
 306         }
 307
 308         latency = TIME_UNITS_PER_SEC*(qopt->limit/(double)rate64) - tc_core_tick2time(qopt->buffer);
 309         if (prate64) {
 310                 double lat2 = TIME_UNITS_PER_SEC*(qopt->limit/(double)prate64) - tc_core_tick2time(qopt->mtu);
 311
 312                 if (lat2 > latency)
 313                         latency = lat2;
 314         }
 315         if (latency >= 0.0)
 316                 fprintf(f, "lat %s ", sprint_time(latency, b1));
 317         if (show_raw || latency < 0.0)
 318                 fprintf(f, "limit %s ", sprint_size(qopt->limit, b1));
 319
 320         if (qopt->rate.overhead) {
 321                 fprintf(f, "overhead %d", qopt->rate.overhead);
 322         }
 323         linklayer = (qopt->rate.linklayer & TC_LINKLAYER_MASK);
 324         if (linklayer > TC_LINKLAYER_ETHERNET || show_details)
 325                 fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3));
 326
 327         return 0;
 328 }
 329
 330 struct qdisc_util tbf_qdisc_util = {
 331         .id             = "tbf",
 332         .parse_qopt     = tbf_parse_opt,
 333         .print_qopt     = tbf_print_opt,
 334 };