dummynet.c revision 187983
1/* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD: head/sbin/ipfw/dummynet.c 187983 2009-02-01 16:00:49Z luigi $ 21 * 22 * dummynet support 23 */ 24 25#include <sys/types.h> 26#include <sys/socket.h> 27#include <sys/queue.h> 28/* XXX there are several sysctl leftover here */ 29#include <sys/sysctl.h> 30 31#include "ipfw2.h" 32 33#include <ctype.h> 34#include <err.h> 35#include <netdb.h> 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <sysexits.h> 40 41#include <net/if.h> 42#include <net/if.h> 43#include <netinet/in.h> 44#include <netinet/ip_fw.h> 45#include <netinet/ip_dummynet.h> 46#include <arpa/inet.h> /* inet_ntoa */ 47 48static struct _s_x dummynet_params[] = { 49 { "plr", TOK_PLR }, 50 { "noerror", TOK_NOERROR }, 51 { "buckets", TOK_BUCKETS }, 52 { "dst-ip", TOK_DSTIP }, 53 { "src-ip", TOK_SRCIP }, 54 { "dst-port", TOK_DSTPORT }, 55 { "src-port", TOK_SRCPORT }, 56 { "proto", TOK_PROTO }, 57 { "weight", TOK_WEIGHT }, 58 { "all", TOK_ALL }, 59 { "mask", TOK_MASK }, 60 { "droptail", TOK_DROPTAIL }, 61 { "red", TOK_RED }, 62 { "gred", TOK_GRED }, 63 { "bw", TOK_BW }, 64 { "bandwidth", TOK_BW }, 65 { "delay", TOK_DELAY }, 66 { "pipe", TOK_PIPE }, 67 { "queue", TOK_QUEUE }, 68 { "flow-id", TOK_FLOWID}, 69 { "dst-ipv6", TOK_DSTIP6}, 70 { "dst-ip6", TOK_DSTIP6}, 71 { "src-ipv6", TOK_SRCIP6}, 72 { "src-ip6", TOK_SRCIP6}, 73 { "dummynet-params", TOK_NULL }, 74 { NULL, 0 } /* terminator */ 75}; 76 77static int 78sort_q(const void *pa, const void *pb) 79{ 80 int rev = (co.do_sort < 0); 81 int field = rev ? -co.do_sort : co.do_sort; 82 long long res = 0; 83 const struct dn_flow_queue *a = pa; 84 const struct dn_flow_queue *b = pb; 85 86 switch (field) { 87 case 1: /* pkts */ 88 res = a->len - b->len; 89 break; 90 case 2: /* bytes */ 91 res = a->len_bytes - b->len_bytes; 92 break; 93 94 case 3: /* tot pkts */ 95 res = a->tot_pkts - b->tot_pkts; 96 break; 97 98 case 4: /* tot bytes */ 99 res = a->tot_bytes - b->tot_bytes; 100 break; 101 } 102 if (res < 0) 103 res = -1; 104 if (res > 0) 105 res = 1; 106 return (int)(rev ? res : -res); 107} 108 109static void 110list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q) 111{ 112 int l; 113 int index_printed, indexes = 0; 114 char buff[255]; 115 struct protoent *pe; 116 117 if (fs->rq_elements == 0) 118 return; 119 120 if (co.do_sort != 0) 121 heapsort(q, fs->rq_elements, sizeof *q, sort_q); 122 123 /* Print IPv4 flows */ 124 index_printed = 0; 125 for (l = 0; l < fs->rq_elements; l++) { 126 struct in_addr ina; 127 128 /* XXX: Should check for IPv4 flows */ 129 if (IS_IP6_FLOW_ID(&(q[l].id))) 130 continue; 131 132 if (!index_printed) { 133 index_printed = 1; 134 if (indexes > 0) /* currently a no-op */ 135 printf("\n"); 136 indexes++; 137 printf(" " 138 "mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n", 139 fs->flow_mask.proto, 140 fs->flow_mask.src_ip, fs->flow_mask.src_port, 141 fs->flow_mask.dst_ip, fs->flow_mask.dst_port); 142 143 printf("BKT Prot ___Source IP/port____ " 144 "____Dest. IP/port____ " 145 "Tot_pkt/bytes Pkt/Byte Drp\n"); 146 } 147 148 printf("%3d ", q[l].hash_slot); 149 pe = getprotobynumber(q[l].id.proto); 150 if (pe) 151 printf("%-4s ", pe->p_name); 152 else 153 printf("%4u ", q[l].id.proto); 154 ina.s_addr = htonl(q[l].id.src_ip); 155 printf("%15s/%-5d ", 156 inet_ntoa(ina), q[l].id.src_port); 157 ina.s_addr = htonl(q[l].id.dst_ip); 158 printf("%15s/%-5d ", 159 inet_ntoa(ina), q[l].id.dst_port); 160 printf("%4llu %8llu %2u %4u %3u\n", 161 align_uint64(&q[l].tot_pkts), 162 align_uint64(&q[l].tot_bytes), 163 q[l].len, q[l].len_bytes, q[l].drops); 164 if (co.verbose) 165 printf(" S %20llu F %20llu\n", 166 align_uint64(&q[l].S), align_uint64(&q[l].F)); 167 } 168 169 /* Print IPv6 flows */ 170 index_printed = 0; 171 for (l = 0; l < fs->rq_elements; l++) { 172 if (!IS_IP6_FLOW_ID(&(q[l].id))) 173 continue; 174 175 if (!index_printed) { 176 index_printed = 1; 177 if (indexes > 0) 178 printf("\n"); 179 indexes++; 180 printf("\n mask: proto: 0x%02x, flow_id: 0x%08x, ", 181 fs->flow_mask.proto, fs->flow_mask.flow_id6); 182 inet_ntop(AF_INET6, &(fs->flow_mask.src_ip6), 183 buff, sizeof(buff)); 184 printf("%s/0x%04x -> ", buff, fs->flow_mask.src_port); 185 inet_ntop( AF_INET6, &(fs->flow_mask.dst_ip6), 186 buff, sizeof(buff) ); 187 printf("%s/0x%04x\n", buff, fs->flow_mask.dst_port); 188 189 printf("BKT ___Prot___ _flow-id_ " 190 "______________Source IPv6/port_______________ " 191 "_______________Dest. IPv6/port_______________ " 192 "Tot_pkt/bytes Pkt/Byte Drp\n"); 193 } 194 printf("%3d ", q[l].hash_slot); 195 pe = getprotobynumber(q[l].id.proto); 196 if (pe != NULL) 197 printf("%9s ", pe->p_name); 198 else 199 printf("%9u ", q[l].id.proto); 200 printf("%7d %39s/%-5d ", q[l].id.flow_id6, 201 inet_ntop(AF_INET6, &(q[l].id.src_ip6), buff, sizeof(buff)), 202 q[l].id.src_port); 203 printf(" %39s/%-5d ", 204 inet_ntop(AF_INET6, &(q[l].id.dst_ip6), buff, sizeof(buff)), 205 q[l].id.dst_port); 206 printf(" %4llu %8llu %2u %4u %3u\n", 207 align_uint64(&q[l].tot_pkts), 208 align_uint64(&q[l].tot_bytes), 209 q[l].len, q[l].len_bytes, q[l].drops); 210 if (co.verbose) 211 printf(" S %20llu F %20llu\n", 212 align_uint64(&q[l].S), 213 align_uint64(&q[l].F)); 214 } 215} 216 217static void 218print_flowset_parms(struct dn_flow_set *fs, char *prefix) 219{ 220 int l; 221 char qs[30]; 222 char plr[30]; 223 char red[90]; /* Display RED parameters */ 224 225 l = fs->qsize; 226 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 227 if (l >= 8192) 228 sprintf(qs, "%d KB", l / 1024); 229 else 230 sprintf(qs, "%d B", l); 231 } else 232 sprintf(qs, "%3d sl.", l); 233 if (fs->plr) 234 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 235 else 236 plr[0] = '\0'; 237 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 238 sprintf(red, 239 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 240 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 241 1.0 * fs->w_q / (double)(1 << SCALE_RED), 242 SCALE_VAL(fs->min_th), 243 SCALE_VAL(fs->max_th), 244 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 245 else 246 sprintf(red, "droptail"); 247 248 printf("%s %s%s %d queues (%d buckets) %s\n", 249 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 250} 251 252void 253ipfw_list_pipes(void *data, uint nbytes, int ac, char *av[]) 254{ 255 int rulenum; 256 void *next = data; 257 struct dn_pipe *p = (struct dn_pipe *) data; 258 struct dn_flow_set *fs; 259 struct dn_flow_queue *q; 260 int l; 261 262 if (ac > 0) 263 rulenum = strtoul(*av++, NULL, 10); 264 else 265 rulenum = 0; 266 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 267 double b = p->bandwidth; 268 char buf[30]; 269 char prefix[80]; 270 271 if (SLIST_NEXT(p, next) != (struct dn_pipe *)DN_IS_PIPE) 272 break; /* done with pipes, now queues */ 273 274 /* 275 * compute length, as pipe have variable size 276 */ 277 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 278 next = (char *)p + l; 279 nbytes -= l; 280 281 if ((rulenum != 0 && rulenum != p->pipe_nr) || co.do_pipe == 2) 282 continue; 283 284 /* 285 * Print rate (or clocking interface) 286 */ 287 if (p->if_name[0] != '\0') 288 sprintf(buf, "%s", p->if_name); 289 else if (b == 0) 290 sprintf(buf, "unlimited"); 291 else if (b >= 1000000) 292 sprintf(buf, "%7.3f Mbit/s", b/1000000); 293 else if (b >= 1000) 294 sprintf(buf, "%7.3f Kbit/s", b/1000); 295 else 296 sprintf(buf, "%7.3f bit/s ", b); 297 298 sprintf(prefix, "%05d: %s %4d ms ", 299 p->pipe_nr, buf, p->delay); 300 print_flowset_parms(&(p->fs), prefix); 301 if (co.verbose) 302 printf(" V %20llu\n", align_uint64(&p->V) >> MY_M); 303 304 q = (struct dn_flow_queue *)(p+1); 305 list_queues(&(p->fs), q); 306 } 307 for (fs = next; nbytes >= sizeof *fs; fs = next) { 308 char prefix[80]; 309 310 if (SLIST_NEXT(fs, next) != (struct dn_flow_set *)DN_IS_QUEUE) 311 break; 312 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 313 next = (char *)fs + l; 314 nbytes -= l; 315 316 if (rulenum != 0 && ((rulenum != fs->fs_nr && co.do_pipe == 2) || 317 (rulenum != fs->parent_nr && co.do_pipe == 1))) { 318 continue; 319 } 320 321 q = (struct dn_flow_queue *)(fs+1); 322 sprintf(prefix, "q%05d: weight %d pipe %d ", 323 fs->fs_nr, fs->weight, fs->parent_nr); 324 print_flowset_parms(fs, prefix); 325 list_queues(fs, q); 326 } 327} 328 329/* 330 * Delete pipe or queue i 331 */ 332int 333ipfw_delete_pipe(int pipe_or_queue, int i) 334{ 335 struct dn_pipe p; 336 337 memset(&p, 0, sizeof p); 338 if (pipe_or_queue == 1) 339 p.pipe_nr = i; /* pipe */ 340 else 341 p.fs.fs_nr = i; /* queue */ 342 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 343 if (i) { 344 i = 1; 345 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", i); 346 } 347 return i; 348} 349 350void 351ipfw_config_pipe(int ac, char **av) 352{ 353 struct dn_pipe p; 354 int i; 355 char *end; 356 void *par = NULL; 357 358 memset(&p, 0, sizeof p); 359 360 av++; ac--; 361 /* Pipe number */ 362 if (ac && isdigit(**av)) { 363 i = atoi(*av); av++; ac--; 364 if (co.do_pipe == 1) 365 p.pipe_nr = i; 366 else 367 p.fs.fs_nr = i; 368 } 369 while (ac > 0) { 370 double d; 371 int tok = match_token(dummynet_params, *av); 372 ac--; av++; 373 374 switch(tok) { 375 case TOK_NOERROR: 376 p.fs.flags_fs |= DN_NOERROR; 377 break; 378 379 case TOK_PLR: 380 NEED1("plr needs argument 0..1\n"); 381 d = strtod(av[0], NULL); 382 if (d > 1) 383 d = 1; 384 else if (d < 0) 385 d = 0; 386 p.fs.plr = (int)(d*0x7fffffff); 387 ac--; av++; 388 break; 389 390 case TOK_QUEUE: 391 NEED1("queue needs queue size\n"); 392 end = NULL; 393 p.fs.qsize = strtoul(av[0], &end, 0); 394 if (*end == 'K' || *end == 'k') { 395 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 396 p.fs.qsize *= 1024; 397 } else if (*end == 'B' || 398 _substrcmp2(end, "by", "bytes") == 0) { 399 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 400 } 401 ac--; av++; 402 break; 403 404 case TOK_BUCKETS: 405 NEED1("buckets needs argument\n"); 406 p.fs.rq_size = strtoul(av[0], NULL, 0); 407 ac--; av++; 408 break; 409 410 case TOK_MASK: 411 NEED1("mask needs mask specifier\n"); 412 /* 413 * per-flow queue, mask is dst_ip, dst_port, 414 * src_ip, src_port, proto measured in bits 415 */ 416 par = NULL; 417 418 bzero(&p.fs.flow_mask, sizeof(p.fs.flow_mask)); 419 end = NULL; 420 421 while (ac >= 1) { 422 uint32_t *p32 = NULL; 423 uint16_t *p16 = NULL; 424 uint32_t *p20 = NULL; 425 struct in6_addr *pa6 = NULL; 426 uint32_t a; 427 428 tok = match_token(dummynet_params, *av); 429 ac--; av++; 430 switch(tok) { 431 case TOK_ALL: 432 /* 433 * special case, all bits significant 434 */ 435 p.fs.flow_mask.dst_ip = ~0; 436 p.fs.flow_mask.src_ip = ~0; 437 p.fs.flow_mask.dst_port = ~0; 438 p.fs.flow_mask.src_port = ~0; 439 p.fs.flow_mask.proto = ~0; 440 n2mask(&(p.fs.flow_mask.dst_ip6), 128); 441 n2mask(&(p.fs.flow_mask.src_ip6), 128); 442 p.fs.flow_mask.flow_id6 = ~0; 443 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 444 goto end_mask; 445 446 case TOK_DSTIP: 447 p32 = &p.fs.flow_mask.dst_ip; 448 break; 449 450 case TOK_SRCIP: 451 p32 = &p.fs.flow_mask.src_ip; 452 break; 453 454 case TOK_DSTIP6: 455 pa6 = &(p.fs.flow_mask.dst_ip6); 456 break; 457 458 case TOK_SRCIP6: 459 pa6 = &(p.fs.flow_mask.src_ip6); 460 break; 461 462 case TOK_FLOWID: 463 p20 = &p.fs.flow_mask.flow_id6; 464 break; 465 466 case TOK_DSTPORT: 467 p16 = &p.fs.flow_mask.dst_port; 468 break; 469 470 case TOK_SRCPORT: 471 p16 = &p.fs.flow_mask.src_port; 472 break; 473 474 case TOK_PROTO: 475 break; 476 477 default: 478 ac++; av--; /* backtrack */ 479 goto end_mask; 480 } 481 if (ac < 1) 482 errx(EX_USAGE, "mask: value missing"); 483 if (*av[0] == '/') { 484 a = strtoul(av[0]+1, &end, 0); 485 if (pa6 == NULL) 486 a = (a == 32) ? ~0 : (1 << a) - 1; 487 } else 488 a = strtoul(av[0], &end, 0); 489 if (p32 != NULL) 490 *p32 = a; 491 else if (p16 != NULL) { 492 if (a > 0xFFFF) 493 errx(EX_DATAERR, 494 "port mask must be 16 bit"); 495 *p16 = (uint16_t)a; 496 } else if (p20 != NULL) { 497 if (a > 0xfffff) 498 errx(EX_DATAERR, 499 "flow_id mask must be 20 bit"); 500 *p20 = (uint32_t)a; 501 } else if (pa6 != NULL) { 502 if (a > 128) 503 errx(EX_DATAERR, 504 "in6addr invalid mask len"); 505 else 506 n2mask(pa6, a); 507 } else { 508 if (a > 0xFF) 509 errx(EX_DATAERR, 510 "proto mask must be 8 bit"); 511 p.fs.flow_mask.proto = (uint8_t)a; 512 } 513 if (a != 0) 514 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 515 ac--; av++; 516 } /* end while, config masks */ 517end_mask: 518 break; 519 520 case TOK_RED: 521 case TOK_GRED: 522 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 523 p.fs.flags_fs |= DN_IS_RED; 524 if (tok == TOK_GRED) 525 p.fs.flags_fs |= DN_IS_GENTLE_RED; 526 /* 527 * the format for parameters is w_q/min_th/max_th/max_p 528 */ 529 if ((end = strsep(&av[0], "/"))) { 530 double w_q = strtod(end, NULL); 531 if (w_q > 1 || w_q <= 0) 532 errx(EX_DATAERR, "0 < w_q <= 1"); 533 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 534 } 535 if ((end = strsep(&av[0], "/"))) { 536 p.fs.min_th = strtoul(end, &end, 0); 537 if (*end == 'K' || *end == 'k') 538 p.fs.min_th *= 1024; 539 } 540 if ((end = strsep(&av[0], "/"))) { 541 p.fs.max_th = strtoul(end, &end, 0); 542 if (*end == 'K' || *end == 'k') 543 p.fs.max_th *= 1024; 544 } 545 if ((end = strsep(&av[0], "/"))) { 546 double max_p = strtod(end, NULL); 547 if (max_p > 1 || max_p <= 0) 548 errx(EX_DATAERR, "0 < max_p <= 1"); 549 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 550 } 551 ac--; av++; 552 break; 553 554 case TOK_DROPTAIL: 555 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 556 break; 557 558 case TOK_BW: 559 NEED1("bw needs bandwidth or interface\n"); 560 if (co.do_pipe != 1) 561 errx(EX_DATAERR, "bandwidth only valid for pipes"); 562 /* 563 * set clocking interface or bandwidth value 564 */ 565 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 566 int l = sizeof(p.if_name)-1; 567 /* interface name */ 568 strncpy(p.if_name, av[0], l); 569 p.if_name[l] = '\0'; 570 p.bandwidth = 0; 571 } else { 572 p.if_name[0] = '\0'; 573 p.bandwidth = strtoul(av[0], &end, 0); 574 if (*end == 'K' || *end == 'k') { 575 end++; 576 p.bandwidth *= 1000; 577 } else if (*end == 'M') { 578 end++; 579 p.bandwidth *= 1000000; 580 } 581 if ((*end == 'B' && 582 _substrcmp2(end, "Bi", "Bit/s") != 0) || 583 _substrcmp2(end, "by", "bytes") == 0) 584 p.bandwidth *= 8; 585 if (p.bandwidth < 0) 586 errx(EX_DATAERR, "bandwidth too large"); 587 } 588 ac--; av++; 589 break; 590 591 case TOK_DELAY: 592 if (co.do_pipe != 1) 593 errx(EX_DATAERR, "delay only valid for pipes"); 594 NEED1("delay needs argument 0..10000ms\n"); 595 p.delay = strtoul(av[0], NULL, 0); 596 ac--; av++; 597 break; 598 599 case TOK_WEIGHT: 600 if (co.do_pipe == 1) 601 errx(EX_DATAERR,"weight only valid for queues"); 602 NEED1("weight needs argument 0..100\n"); 603 p.fs.weight = strtoul(av[0], &end, 0); 604 ac--; av++; 605 break; 606 607 case TOK_PIPE: 608 if (co.do_pipe == 1) 609 errx(EX_DATAERR,"pipe only valid for queues"); 610 NEED1("pipe needs pipe_number\n"); 611 p.fs.parent_nr = strtoul(av[0], &end, 0); 612 ac--; av++; 613 break; 614 615 default: 616 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 617 } 618 } 619 if (co.do_pipe == 1) { 620 if (p.pipe_nr == 0) 621 errx(EX_DATAERR, "pipe_nr must be > 0"); 622 if (p.delay > 10000) 623 errx(EX_DATAERR, "delay must be < 10000"); 624 } else { /* co.do_pipe == 2, queue */ 625 if (p.fs.parent_nr == 0) 626 errx(EX_DATAERR, "pipe must be > 0"); 627 if (p.fs.weight >100) 628 errx(EX_DATAERR, "weight must be <= 100"); 629 } 630 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 631 size_t len; 632 long limit; 633 634 len = sizeof(limit); 635 if (sysctlbyname("net.inet.ip.dummynet.pipe_byte_limit", 636 &limit, &len, NULL, 0) == -1) 637 limit = 1024*1024; 638 if (p.fs.qsize > limit) 639 errx(EX_DATAERR, "queue size must be < %ldB", limit); 640 } else { 641 size_t len; 642 long limit; 643 644 len = sizeof(limit); 645 if (sysctlbyname("net.inet.ip.dummynet.pipe_slot_limit", 646 &limit, &len, NULL, 0) == -1) 647 limit = 100; 648 if (p.fs.qsize > limit) 649 errx(EX_DATAERR, "2 <= queue size <= %ld", limit); 650 } 651 if (p.fs.flags_fs & DN_IS_RED) { 652 size_t len; 653 int lookup_depth, avg_pkt_size; 654 double s, idle, weight, w_q; 655 struct clockinfo ck; 656 int t; 657 658 if (p.fs.min_th >= p.fs.max_th) 659 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 660 p.fs.min_th, p.fs.max_th); 661 if (p.fs.max_th == 0) 662 errx(EX_DATAERR, "max_th must be > 0"); 663 664 len = sizeof(int); 665 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 666 &lookup_depth, &len, NULL, 0) == -1) 667 errx(1, "sysctlbyname(\"%s\")", 668 "net.inet.ip.dummynet.red_lookup_depth"); 669 if (lookup_depth == 0) 670 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 671 " must be greater than zero"); 672 673 len = sizeof(int); 674 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 675 &avg_pkt_size, &len, NULL, 0) == -1) 676 677 errx(1, "sysctlbyname(\"%s\")", 678 "net.inet.ip.dummynet.red_avg_pkt_size"); 679 if (avg_pkt_size == 0) 680 errx(EX_DATAERR, 681 "net.inet.ip.dummynet.red_avg_pkt_size must" 682 " be greater than zero"); 683 684 len = sizeof(struct clockinfo); 685 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 686 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 687 688 /* 689 * Ticks needed for sending a medium-sized packet. 690 * Unfortunately, when we are configuring a WF2Q+ queue, we 691 * do not have bandwidth information, because that is stored 692 * in the parent pipe, and also we have multiple queues 693 * competing for it. So we set s=0, which is not very 694 * correct. But on the other hand, why do we want RED with 695 * WF2Q+ ? 696 */ 697 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 698 s = 0; 699 else 700 s = (double)ck.hz * avg_pkt_size * 8 / p.bandwidth; 701 702 /* 703 * max idle time (in ticks) before avg queue size becomes 0. 704 * NOTA: (3/w_q) is approx the value x so that 705 * (1-w_q)^x < 10^-3. 706 */ 707 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 708 idle = s * 3. / w_q; 709 p.fs.lookup_step = (int)idle / lookup_depth; 710 if (!p.fs.lookup_step) 711 p.fs.lookup_step = 1; 712 weight = 1 - w_q; 713 for (t = p.fs.lookup_step; t > 1; --t) 714 weight *= 1 - w_q; 715 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 716 } 717 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 718 if (i) 719 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 720} 721