1 /* 2 * q_htb.c HTB. 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: Martin Devera, devik (at) cdi.cz 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 #define HTB_TC_VER 0x30003 27 #if HTB_TC_VER >> 16 != TC_HTB_PROTOVER 28 #error "Different kernel and TC HTB versions" 29 #endif 30 31 static void explain(void) 32 { 33 fprintf(stderr, "Usage: ... qdisc add ... htb [default N] [r2q N]\n" 34 " [direct_qlen P]\n" 35 " default minor id of class to which unclassified packets are sent {0}\n" 36 " r2q DRR quantums are computed as rate in Bps/r2q {10}\n" 37 " debug string of 16 numbers each 0-3 {0}\n\n" 38 " direct_qlen Limit of the direct queue {in packets}\n" 39 "... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]\n" 40 " [prio P] [slot S] [pslot PS]\n" 41 " [ceil R2] [cburst B2] [mtu MTU] [quantum Q]\n" 42 " rate rate allocated to this class (class can still borrow)\n" 43 " burst max bytes burst which can be accumulated during idle period {computed}\n" 44 " mpu minimum packet size used in rate computations\n" 45 " overhead per-packet size overhead used in rate computations\n" 46 " linklay adapting to a linklayer e.g. atm\n" 47 " ceil definite upper class rate (no borrows) {rate}\n" 48 " cburst burst but for ceil {computed}\n" 49 " mtu max packet size we create rate map for {1600}\n" 50 " prio priority of leaf; lower are served first {0}\n" 51 " quantum how much bytes to serve from leaf at once {use r2q}\n" 52 "\nTC HTB version %d.%d\n", HTB_TC_VER>>16, HTB_TC_VER&0xffff 53 ); 54 } 55 56 static void explain1(char *arg) 57 { 58 fprintf(stderr, "Illegal \"%s\"\n", arg); 59 explain(); 60 } 61 62 63 static int htb_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) 64 { 65 unsigned int direct_qlen = ~0U; 66 struct tc_htb_glob opt = { 67 .rate2quantum = 10, 68 .version = 3, 69 }; 70 struct rtattr *tail; 71 unsigned int i; char *p; 72 73 while (argc > 0) { 74 if (matches(*argv, "r2q") == 0) { 75 NEXT_ARG(); 76 if (get_u32(&opt.rate2quantum, *argv, 10)) { 77 explain1("r2q"); return -1; 78 } 79 } else if (matches(*argv, "default") == 0) { 80 NEXT_ARG(); 81 if (get_u32(&opt.defcls, *argv, 16)) { 82 explain1("default"); return -1; 83 } 84 } else if (matches(*argv, "debug") == 0) { 85 NEXT_ARG(); p = *argv; 86 for (i = 0; i < 16; i++, p++) { 87 if (*p < '0' || *p > '3') break; 88 opt.debug |= (*p-'0')<<(2*i); 89 } 90 } else if (matches(*argv, "direct_qlen") == 0) { 91 NEXT_ARG(); 92 if (get_u32(&direct_qlen, *argv, 10)) { 93 explain1("direct_qlen"); return -1; 94 } 95 } else { 96 fprintf(stderr, "What is \"%s\"?\n", *argv); 97 explain(); 98 return -1; 99 } 100 argc--; argv++; 101 } 102 tail = NLMSG_TAIL(n); 103 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); 104 addattr_l(n, 2024, TCA_HTB_INIT, &opt, NLMSG_ALIGN(sizeof(opt))); 105 if (direct_qlen != ~0U) 106 addattr_l(n, 2024, TCA_HTB_DIRECT_QLEN, 107 &direct_qlen, sizeof(direct_qlen)); 108 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; 109 return 0; 110 } 111 112 static int htb_parse_class_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) 113 { 114 int ok = 0; 115 struct tc_htb_opt opt = {}; 116 __u32 rtab[256], ctab[256]; 117 unsigned buffer = 0, cbuffer = 0; 118 int cell_log = -1, ccell_log = -1; 119 unsigned int mtu = 1600; /* eth packet len */ 120 unsigned short mpu = 0; 121 unsigned short overhead = 0; 122 unsigned int linklayer = LINKLAYER_ETHERNET; /* Assume ethernet */ 123 struct rtattr *tail; 124 __u64 ceil64 = 0, rate64 = 0; 125 126 while (argc > 0) { 127 if (matches(*argv, "prio") == 0) { 128 NEXT_ARG(); 129 if (get_u32(&opt.prio, *argv, 10)) { 130 explain1("prio"); return -1; 131 } 132 ok++; 133 } else if (matches(*argv, "mtu") == 0) { 134 NEXT_ARG(); 135 if (get_u32(&mtu, *argv, 10)) { 136 explain1("mtu"); return -1; 137 } 138 } else if (matches(*argv, "mpu") == 0) { 139 NEXT_ARG(); 140 if (get_u16(&mpu, *argv, 10)) { 141 explain1("mpu"); return -1; 142 } 143 } else if (matches(*argv, "overhead") == 0) { 144 NEXT_ARG(); 145 if (get_u16(&overhead, *argv, 10)) { 146 explain1("overhead"); return -1; 147 } 148 } else if (matches(*argv, "linklayer") == 0) { 149 NEXT_ARG(); 150 if (get_linklayer(&linklayer, *argv)) { 151 explain1("linklayer"); return -1; 152 } 153 } else if (matches(*argv, "quantum") == 0) { 154 NEXT_ARG(); 155 if (get_u32(&opt.quantum, *argv, 10)) { 156 explain1("quantum"); return -1; 157 } 158 } else if (matches(*argv, "burst") == 0 || 159 strcmp(*argv, "buffer") == 0 || 160 strcmp(*argv, "maxburst") == 0) { 161 NEXT_ARG(); 162 if (get_size_and_cell(&buffer, &cell_log, *argv) < 0) { 163 explain1("buffer"); 164 return -1; 165 } 166 ok++; 167 } else if (matches(*argv, "cburst") == 0 || 168 strcmp(*argv, "cbuffer") == 0 || 169 strcmp(*argv, "cmaxburst") == 0) { 170 NEXT_ARG(); 171 if (get_size_and_cell(&cbuffer, &ccell_log, *argv) < 0) { 172 explain1("cbuffer"); 173 return -1; 174 } 175 ok++; 176 } else if (strcmp(*argv, "ceil") == 0) { 177 NEXT_ARG(); 178 if (ceil64) { 179 fprintf(stderr, "Double \"ceil\" spec\n"); 180 return -1; 181 } 182 if (get_rate64(&ceil64, *argv)) { 183 explain1("ceil"); 184 return -1; 185 } 186 ok++; 187 } else if (strcmp(*argv, "rate") == 0) { 188 NEXT_ARG(); 189 if (rate64) { 190 fprintf(stderr, "Double \"rate\" spec\n"); 191 return -1; 192 } 193 if (get_rate64(&rate64, *argv)) { 194 explain1("rate"); 195 return -1; 196 } 197 ok++; 198 } else if (strcmp(*argv, "help") == 0) { 199 explain(); 200 return -1; 201 } else { 202 fprintf(stderr, "What is \"%s\"?\n", *argv); 203 explain(); 204 return -1; 205 } 206 argc--; argv++; 207 } 208 209 /* if (!ok) 210 return 0;*/ 211 212 if (!rate64) { 213 fprintf(stderr, "\"rate\" is required.\n"); 214 return -1; 215 } 216 /* if ceil params are missing, use the same as rate */ 217 if (!ceil64) 218 ceil64 = rate64; 219 220 opt.rate.rate = (rate64 >= (1ULL << 32)) ? ~0U : rate64; 221 opt.ceil.rate = (ceil64 >= (1ULL << 32)) ? ~0U : ceil64; 222 223 /* compute minimal allowed burst from rate; mtu is added here to make 224 sute that buffer is larger than mtu and to have some safeguard space */ 225 if (!buffer) 226 buffer = rate64 / get_hz() + mtu; 227 if (!cbuffer) 228 cbuffer = ceil64 / get_hz() + mtu; 229 230 opt.ceil.overhead = overhead; 231 opt.rate.overhead = overhead; 232 233 opt.ceil.mpu = mpu; 234 opt.rate.mpu = mpu; 235 236 if (tc_calc_rtable(&opt.rate, rtab, cell_log, mtu, linklayer) < 0) { 237 fprintf(stderr, "htb: failed to calculate rate table.\n"); 238 return -1; 239 } 240 opt.buffer = tc_calc_xmittime(rate64, buffer); 241 242 if (tc_calc_rtable(&opt.ceil, ctab, ccell_log, mtu, linklayer) < 0) { 243 fprintf(stderr, "htb: failed to calculate ceil rate table.\n"); 244 return -1; 245 } 246 opt.cbuffer = tc_calc_xmittime(ceil64, cbuffer); 247 248 tail = NLMSG_TAIL(n); 249 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); 250 251 if (rate64 >= (1ULL << 32)) 252 addattr_l(n, 1124, TCA_HTB_RATE64, &rate64, sizeof(rate64)); 253 254 if (ceil64 >= (1ULL << 32)) 255 addattr_l(n, 1224, TCA_HTB_CEIL64, &ceil64, sizeof(ceil64)); 256 257 addattr_l(n, 2024, TCA_HTB_PARMS, &opt, sizeof(opt)); 258 addattr_l(n, 3024, TCA_HTB_RTAB, rtab, 1024); 259 addattr_l(n, 4024, TCA_HTB_CTAB, ctab, 1024); 260 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; 261 return 0; 262 } 263 264 static int htb_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) 265 { 266 struct rtattr *tb[TCA_HTB_MAX + 1]; 267 struct tc_htb_opt *hopt; 268 struct tc_htb_glob *gopt; 269 double buffer, cbuffer; 270 unsigned int linklayer; 271 __u64 rate64, ceil64; 272 273 SPRINT_BUF(b1); 274 SPRINT_BUF(b2); 275 SPRINT_BUF(b3); 276 277 if (opt == NULL) 278 return 0; 279 280 parse_rtattr_nested(tb, TCA_HTB_MAX, opt); 281 282 if (tb[TCA_HTB_PARMS]) { 283 hopt = RTA_DATA(tb[TCA_HTB_PARMS]); 284 if (RTA_PAYLOAD(tb[TCA_HTB_PARMS]) < sizeof(*hopt)) return -1; 285 286 if (!hopt->level) { 287 fprintf(f, "prio %d ", (int)hopt->prio); 288 if (show_details) 289 fprintf(f, "quantum %d ", (int)hopt->quantum); 290 } 291 292 rate64 = hopt->rate.rate; 293 if (tb[TCA_HTB_RATE64] && 294 RTA_PAYLOAD(tb[TCA_HTB_RATE64]) >= sizeof(rate64)) { 295 rate64 = rta_getattr_u64(tb[TCA_HTB_RATE64]); 296 } 297 298 ceil64 = hopt->ceil.rate; 299 if (tb[TCA_HTB_CEIL64] && 300 RTA_PAYLOAD(tb[TCA_HTB_CEIL64]) >= sizeof(ceil64)) 301 ceil64 = rta_getattr_u64(tb[TCA_HTB_CEIL64]); 302 303 fprintf(f, "rate %s ", sprint_rate(rate64, b1)); 304 if (hopt->rate.overhead) 305 fprintf(f, "overhead %u ", hopt->rate.overhead); 306 buffer = tc_calc_xmitsize(rate64, hopt->buffer); 307 308 fprintf(f, "ceil %s ", sprint_rate(ceil64, b1)); 309 cbuffer = tc_calc_xmitsize(ceil64, hopt->cbuffer); 310 linklayer = (hopt->rate.linklayer & TC_LINKLAYER_MASK); 311 if (linklayer > TC_LINKLAYER_ETHERNET || show_details) 312 fprintf(f, "linklayer %s ", sprint_linklayer(linklayer, b3)); 313 if (show_details) { 314 fprintf(f, "burst %s/%u mpu %s ", 315 sprint_size(buffer, b1), 316 1<<hopt->rate.cell_log, 317 sprint_size(hopt->rate.mpu, b2)); 318 fprintf(f, "cburst %s/%u mpu %s ", 319 sprint_size(cbuffer, b1), 320 1<<hopt->ceil.cell_log, 321 sprint_size(hopt->ceil.mpu, b2)); 322 fprintf(f, "level %d ", (int)hopt->level); 323 } else { 324 fprintf(f, "burst %s ", sprint_size(buffer, b1)); 325 fprintf(f, "cburst %s ", sprint_size(cbuffer, b1)); 326 } 327 if (show_raw) 328 fprintf(f, "buffer [%08x] cbuffer [%08x] ", 329 hopt->buffer, hopt->cbuffer); 330 } 331 if (tb[TCA_HTB_INIT]) { 332 gopt = RTA_DATA(tb[TCA_HTB_INIT]); 333 if (RTA_PAYLOAD(tb[TCA_HTB_INIT]) < sizeof(*gopt)) return -1; 334 335 fprintf(f, "r2q %d default %x direct_packets_stat %u", 336 gopt->rate2quantum, gopt->defcls, gopt->direct_pkts); 337 if (show_details) 338 fprintf(f, " ver %d.%d", gopt->version >> 16, gopt->version & 0xffff); 339 } 340 if (tb[TCA_HTB_DIRECT_QLEN] && 341 RTA_PAYLOAD(tb[TCA_HTB_DIRECT_QLEN]) >= sizeof(__u32)) { 342 __u32 direct_qlen = rta_getattr_u32(tb[TCA_HTB_DIRECT_QLEN]); 343 344 fprintf(f, " direct_qlen %u", direct_qlen); 345 } 346 return 0; 347 } 348 349 static int htb_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats) 350 { 351 struct tc_htb_xstats *st; 352 353 if (xstats == NULL) 354 return 0; 355 356 if (RTA_PAYLOAD(xstats) < sizeof(*st)) 357 return -1; 358 359 st = RTA_DATA(xstats); 360 fprintf(f, " lended: %u borrowed: %u giants: %u\n", 361 st->lends, st->borrows, st->giants); 362 fprintf(f, " tokens: %d ctokens: %d\n", st->tokens, st->ctokens); 363 return 0; 364 } 365 366 struct qdisc_util htb_qdisc_util = { 367 .id = "htb", 368 .parse_qopt = htb_parse_opt, 369 .print_qopt = htb_print_opt, 370 .print_xstats = htb_print_xstats, 371 .parse_copt = htb_parse_class_opt, 372 .print_copt = htb_print_opt, 373 }; 374
