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 (at) 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 }; 335
