dummynet.c revision 187771
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 187771 2009-01-27 12:24:53Z luigi $ 21 * 22 * dummynet support 23 */ 24 25#include <sys/types.h> 26#include <sys/socket.h> 27#include <sys/sockio.h> 28#include <sys/sysctl.h> 29 30#include "ipfw2.h" 31 32#include <ctype.h> 33#include <err.h> 34#include <netdb.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <string.h> 38#include <sysexits.h> 39 40#include <net/if.h> 41#include <netinet/in.h> 42#include <netinet/in_systm.h> 43#include <netinet/ip.h> 44#include <netinet/ip_fw.h> 45#include <netinet/ip_dummynet.h> 46#include <arpa/inet.h> 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("%4qu %8qu %2u %4u %3u\n", 161 q[l].tot_pkts, q[l].tot_bytes, 162 q[l].len, q[l].len_bytes, q[l].drops); 163 if (co.verbose) 164 printf(" S %20qd F %20qd\n", 165 q[l].S, q[l].F); 166 } 167 168 /* Print IPv6 flows */ 169 index_printed = 0; 170 for (l = 0; l < fs->rq_elements; l++) { 171 if (!IS_IP6_FLOW_ID(&(q[l].id))) 172 continue; 173 174 if (!index_printed) { 175 index_printed = 1; 176 if (indexes > 0) 177 printf("\n"); 178 indexes++; 179 printf("\n mask: proto: 0x%02x, flow_id: 0x%08x, ", 180 fs->flow_mask.proto, fs->flow_mask.flow_id6); 181 inet_ntop(AF_INET6, &(fs->flow_mask.src_ip6), 182 buff, sizeof(buff)); 183 printf("%s/0x%04x -> ", buff, fs->flow_mask.src_port); 184 inet_ntop( AF_INET6, &(fs->flow_mask.dst_ip6), 185 buff, sizeof(buff) ); 186 printf("%s/0x%04x\n", buff, fs->flow_mask.dst_port); 187 188 printf("BKT ___Prot___ _flow-id_ " 189 "______________Source IPv6/port_______________ " 190 "_______________Dest. IPv6/port_______________ " 191 "Tot_pkt/bytes Pkt/Byte Drp\n"); 192 } 193 printf("%3d ", q[l].hash_slot); 194 pe = getprotobynumber(q[l].id.proto); 195 if (pe != NULL) 196 printf("%9s ", pe->p_name); 197 else 198 printf("%9u ", q[l].id.proto); 199 printf("%7d %39s/%-5d ", q[l].id.flow_id6, 200 inet_ntop(AF_INET6, &(q[l].id.src_ip6), buff, sizeof(buff)), 201 q[l].id.src_port); 202 printf(" %39s/%-5d ", 203 inet_ntop(AF_INET6, &(q[l].id.dst_ip6), buff, sizeof(buff)), 204 q[l].id.dst_port); 205 printf(" %4qu %8qu %2u %4u %3u\n", 206 q[l].tot_pkts, q[l].tot_bytes, 207 q[l].len, q[l].len_bytes, q[l].drops); 208 if (co.verbose) 209 printf(" S %20qd F %20qd\n", q[l].S, q[l].F); 210 } 211} 212 213static void 214print_flowset_parms(struct dn_flow_set *fs, char *prefix) 215{ 216 int l; 217 char qs[30]; 218 char plr[30]; 219 char red[90]; /* Display RED parameters */ 220 221 l = fs->qsize; 222 if (fs->flags_fs & DN_QSIZE_IS_BYTES) { 223 if (l >= 8192) 224 sprintf(qs, "%d KB", l / 1024); 225 else 226 sprintf(qs, "%d B", l); 227 } else 228 sprintf(qs, "%3d sl.", l); 229 if (fs->plr) 230 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff)); 231 else 232 plr[0] = '\0'; 233 if (fs->flags_fs & DN_IS_RED) /* RED parameters */ 234 sprintf(red, 235 "\n\t %cRED w_q %f min_th %d max_th %d max_p %f", 236 (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ', 237 1.0 * fs->w_q / (double)(1 << SCALE_RED), 238 SCALE_VAL(fs->min_th), 239 SCALE_VAL(fs->max_th), 240 1.0 * fs->max_p / (double)(1 << SCALE_RED)); 241 else 242 sprintf(red, "droptail"); 243 244 printf("%s %s%s %d queues (%d buckets) %s\n", 245 prefix, qs, plr, fs->rq_elements, fs->rq_size, red); 246} 247 248void 249ipfw_list_pipes(void *data, uint nbytes, int ac, char *av[]) 250{ 251 int rulenum; 252 void *next = data; 253 struct dn_pipe *p = (struct dn_pipe *) data; 254 struct dn_flow_set *fs; 255 struct dn_flow_queue *q; 256 int l; 257 258 if (ac > 0) 259 rulenum = strtoul(*av++, NULL, 10); 260 else 261 rulenum = 0; 262 for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) { 263 double b = p->bandwidth; 264 char buf[30]; 265 char prefix[80]; 266 267 if (SLIST_NEXT(p, next) != (struct dn_pipe *)DN_IS_PIPE) 268 break; /* done with pipes, now queues */ 269 270 /* 271 * compute length, as pipe have variable size 272 */ 273 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q); 274 next = (char *)p + l; 275 nbytes -= l; 276 277 if ((rulenum != 0 && rulenum != p->pipe_nr) || co.do_pipe == 2) 278 continue; 279 280 /* 281 * Print rate (or clocking interface) 282 */ 283 if (p->if_name[0] != '\0') 284 sprintf(buf, "%s", p->if_name); 285 else if (b == 0) 286 sprintf(buf, "unlimited"); 287 else if (b >= 1000000) 288 sprintf(buf, "%7.3f Mbit/s", b/1000000); 289 else if (b >= 1000) 290 sprintf(buf, "%7.3f Kbit/s", b/1000); 291 else 292 sprintf(buf, "%7.3f bit/s ", b); 293 294 sprintf(prefix, "%05d: %s %4d ms ", 295 p->pipe_nr, buf, p->delay); 296 print_flowset_parms(&(p->fs), prefix); 297 if (co.verbose) 298 printf(" V %20qd\n", p->V >> MY_M); 299 300 q = (struct dn_flow_queue *)(p+1); 301 list_queues(&(p->fs), q); 302 } 303 for (fs = next; nbytes >= sizeof *fs; fs = next) { 304 char prefix[80]; 305 306 if (SLIST_NEXT(fs, next) != (struct dn_flow_set *)DN_IS_QUEUE) 307 break; 308 l = sizeof(*fs) + fs->rq_elements * sizeof(*q); 309 next = (char *)fs + l; 310 nbytes -= l; 311 312 if (rulenum != 0 && ((rulenum != fs->fs_nr && co.do_pipe == 2) || 313 (rulenum != fs->parent_nr && co.do_pipe == 1))) { 314 continue; 315 } 316 317 q = (struct dn_flow_queue *)(fs+1); 318 sprintf(prefix, "q%05d: weight %d pipe %d ", 319 fs->fs_nr, fs->weight, fs->parent_nr); 320 print_flowset_parms(fs, prefix); 321 list_queues(fs, q); 322 } 323} 324 325/* 326 * Delete pipe or queue i 327 */ 328int 329ipfw_delete_pipe(int pipe_or_queue, int i) 330{ 331 struct dn_pipe p; 332 333 memset(&p, 0, sizeof p); 334 if (pipe_or_queue == 1) 335 p.pipe_nr = i; /* pipe */ 336 else 337 p.fs.fs_nr = i; /* queue */ 338 i = do_cmd(IP_DUMMYNET_DEL, &p, sizeof p); 339 if (i) { 340 i = 1; 341 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)", i); 342 } 343 return i; 344} 345 346void 347ipfw_config_pipe(int ac, char **av) 348{ 349 struct dn_pipe p; 350 int i; 351 char *end; 352 void *par = NULL; 353 354 memset(&p, 0, sizeof p); 355 356 av++; ac--; 357 /* Pipe number */ 358 if (ac && isdigit(**av)) { 359 i = atoi(*av); av++; ac--; 360 if (co.do_pipe == 1) 361 p.pipe_nr = i; 362 else 363 p.fs.fs_nr = i; 364 } 365 while (ac > 0) { 366 double d; 367 int tok = match_token(dummynet_params, *av); 368 ac--; av++; 369 370 switch(tok) { 371 case TOK_NOERROR: 372 p.fs.flags_fs |= DN_NOERROR; 373 break; 374 375 case TOK_PLR: 376 NEED1("plr needs argument 0..1\n"); 377 d = strtod(av[0], NULL); 378 if (d > 1) 379 d = 1; 380 else if (d < 0) 381 d = 0; 382 p.fs.plr = (int)(d*0x7fffffff); 383 ac--; av++; 384 break; 385 386 case TOK_QUEUE: 387 NEED1("queue needs queue size\n"); 388 end = NULL; 389 p.fs.qsize = strtoul(av[0], &end, 0); 390 if (*end == 'K' || *end == 'k') { 391 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 392 p.fs.qsize *= 1024; 393 } else if (*end == 'B' || 394 _substrcmp2(end, "by", "bytes") == 0) { 395 p.fs.flags_fs |= DN_QSIZE_IS_BYTES; 396 } 397 ac--; av++; 398 break; 399 400 case TOK_BUCKETS: 401 NEED1("buckets needs argument\n"); 402 p.fs.rq_size = strtoul(av[0], NULL, 0); 403 ac--; av++; 404 break; 405 406 case TOK_MASK: 407 NEED1("mask needs mask specifier\n"); 408 /* 409 * per-flow queue, mask is dst_ip, dst_port, 410 * src_ip, src_port, proto measured in bits 411 */ 412 par = NULL; 413 414 bzero(&p.fs.flow_mask, sizeof(p.fs.flow_mask)); 415 end = NULL; 416 417 while (ac >= 1) { 418 uint32_t *p32 = NULL; 419 uint16_t *p16 = NULL; 420 uint32_t *p20 = NULL; 421 struct in6_addr *pa6 = NULL; 422 uint32_t a; 423 424 tok = match_token(dummynet_params, *av); 425 ac--; av++; 426 switch(tok) { 427 case TOK_ALL: 428 /* 429 * special case, all bits significant 430 */ 431 p.fs.flow_mask.dst_ip = ~0; 432 p.fs.flow_mask.src_ip = ~0; 433 p.fs.flow_mask.dst_port = ~0; 434 p.fs.flow_mask.src_port = ~0; 435 p.fs.flow_mask.proto = ~0; 436 n2mask(&(p.fs.flow_mask.dst_ip6), 128); 437 n2mask(&(p.fs.flow_mask.src_ip6), 128); 438 p.fs.flow_mask.flow_id6 = ~0; 439 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 440 goto end_mask; 441 442 case TOK_DSTIP: 443 p32 = &p.fs.flow_mask.dst_ip; 444 break; 445 446 case TOK_SRCIP: 447 p32 = &p.fs.flow_mask.src_ip; 448 break; 449 450 case TOK_DSTIP6: 451 pa6 = &(p.fs.flow_mask.dst_ip6); 452 break; 453 454 case TOK_SRCIP6: 455 pa6 = &(p.fs.flow_mask.src_ip6); 456 break; 457 458 case TOK_FLOWID: 459 p20 = &p.fs.flow_mask.flow_id6; 460 break; 461 462 case TOK_DSTPORT: 463 p16 = &p.fs.flow_mask.dst_port; 464 break; 465 466 case TOK_SRCPORT: 467 p16 = &p.fs.flow_mask.src_port; 468 break; 469 470 case TOK_PROTO: 471 break; 472 473 default: 474 ac++; av--; /* backtrack */ 475 goto end_mask; 476 } 477 if (ac < 1) 478 errx(EX_USAGE, "mask: value missing"); 479 if (*av[0] == '/') { 480 a = strtoul(av[0]+1, &end, 0); 481 if (pa6 == NULL) 482 a = (a == 32) ? ~0 : (1 << a) - 1; 483 } else 484 a = strtoul(av[0], &end, 0); 485 if (p32 != NULL) 486 *p32 = a; 487 else if (p16 != NULL) { 488 if (a > 0xFFFF) 489 errx(EX_DATAERR, 490 "port mask must be 16 bit"); 491 *p16 = (uint16_t)a; 492 } else if (p20 != NULL) { 493 if (a > 0xfffff) 494 errx(EX_DATAERR, 495 "flow_id mask must be 20 bit"); 496 *p20 = (uint32_t)a; 497 } else if (pa6 != NULL) { 498 if (a > 128) 499 errx(EX_DATAERR, 500 "in6addr invalid mask len"); 501 else 502 n2mask(pa6, a); 503 } else { 504 if (a > 0xFF) 505 errx(EX_DATAERR, 506 "proto mask must be 8 bit"); 507 p.fs.flow_mask.proto = (uint8_t)a; 508 } 509 if (a != 0) 510 p.fs.flags_fs |= DN_HAVE_FLOW_MASK; 511 ac--; av++; 512 } /* end while, config masks */ 513end_mask: 514 break; 515 516 case TOK_RED: 517 case TOK_GRED: 518 NEED1("red/gred needs w_q/min_th/max_th/max_p\n"); 519 p.fs.flags_fs |= DN_IS_RED; 520 if (tok == TOK_GRED) 521 p.fs.flags_fs |= DN_IS_GENTLE_RED; 522 /* 523 * the format for parameters is w_q/min_th/max_th/max_p 524 */ 525 if ((end = strsep(&av[0], "/"))) { 526 double w_q = strtod(end, NULL); 527 if (w_q > 1 || w_q <= 0) 528 errx(EX_DATAERR, "0 < w_q <= 1"); 529 p.fs.w_q = (int) (w_q * (1 << SCALE_RED)); 530 } 531 if ((end = strsep(&av[0], "/"))) { 532 p.fs.min_th = strtoul(end, &end, 0); 533 if (*end == 'K' || *end == 'k') 534 p.fs.min_th *= 1024; 535 } 536 if ((end = strsep(&av[0], "/"))) { 537 p.fs.max_th = strtoul(end, &end, 0); 538 if (*end == 'K' || *end == 'k') 539 p.fs.max_th *= 1024; 540 } 541 if ((end = strsep(&av[0], "/"))) { 542 double max_p = strtod(end, NULL); 543 if (max_p > 1 || max_p <= 0) 544 errx(EX_DATAERR, "0 < max_p <= 1"); 545 p.fs.max_p = (int)(max_p * (1 << SCALE_RED)); 546 } 547 ac--; av++; 548 break; 549 550 case TOK_DROPTAIL: 551 p.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED); 552 break; 553 554 case TOK_BW: 555 NEED1("bw needs bandwidth or interface\n"); 556 if (co.do_pipe != 1) 557 errx(EX_DATAERR, "bandwidth only valid for pipes"); 558 /* 559 * set clocking interface or bandwidth value 560 */ 561 if (av[0][0] >= 'a' && av[0][0] <= 'z') { 562 int l = sizeof(p.if_name)-1; 563 /* interface name */ 564 strncpy(p.if_name, av[0], l); 565 p.if_name[l] = '\0'; 566 p.bandwidth = 0; 567 } else { 568 p.if_name[0] = '\0'; 569 p.bandwidth = strtoul(av[0], &end, 0); 570 if (*end == 'K' || *end == 'k') { 571 end++; 572 p.bandwidth *= 1000; 573 } else if (*end == 'M') { 574 end++; 575 p.bandwidth *= 1000000; 576 } 577 if ((*end == 'B' && 578 _substrcmp2(end, "Bi", "Bit/s") != 0) || 579 _substrcmp2(end, "by", "bytes") == 0) 580 p.bandwidth *= 8; 581 if (p.bandwidth < 0) 582 errx(EX_DATAERR, "bandwidth too large"); 583 } 584 ac--; av++; 585 break; 586 587 case TOK_DELAY: 588 if (co.do_pipe != 1) 589 errx(EX_DATAERR, "delay only valid for pipes"); 590 NEED1("delay needs argument 0..10000ms\n"); 591 p.delay = strtoul(av[0], NULL, 0); 592 ac--; av++; 593 break; 594 595 case TOK_WEIGHT: 596 if (co.do_pipe == 1) 597 errx(EX_DATAERR,"weight only valid for queues"); 598 NEED1("weight needs argument 0..100\n"); 599 p.fs.weight = strtoul(av[0], &end, 0); 600 ac--; av++; 601 break; 602 603 case TOK_PIPE: 604 if (co.do_pipe == 1) 605 errx(EX_DATAERR,"pipe only valid for queues"); 606 NEED1("pipe needs pipe_number\n"); 607 p.fs.parent_nr = strtoul(av[0], &end, 0); 608 ac--; av++; 609 break; 610 611 default: 612 errx(EX_DATAERR, "unrecognised option ``%s''", av[-1]); 613 } 614 } 615 if (co.do_pipe == 1) { 616 if (p.pipe_nr == 0) 617 errx(EX_DATAERR, "pipe_nr must be > 0"); 618 if (p.delay > 10000) 619 errx(EX_DATAERR, "delay must be < 10000"); 620 } else { /* co.do_pipe == 2, queue */ 621 if (p.fs.parent_nr == 0) 622 errx(EX_DATAERR, "pipe must be > 0"); 623 if (p.fs.weight >100) 624 errx(EX_DATAERR, "weight must be <= 100"); 625 } 626 if (p.fs.flags_fs & DN_QSIZE_IS_BYTES) { 627 size_t len; 628 long limit; 629 630 len = sizeof(limit); 631 if (sysctlbyname("net.inet.ip.dummynet.pipe_byte_limit", 632 &limit, &len, NULL, 0) == -1) 633 limit = 1024*1024; 634 if (p.fs.qsize > limit) 635 errx(EX_DATAERR, "queue size must be < %ldB", limit); 636 } else { 637 size_t len; 638 long limit; 639 640 len = sizeof(limit); 641 if (sysctlbyname("net.inet.ip.dummynet.pipe_slot_limit", 642 &limit, &len, NULL, 0) == -1) 643 limit = 100; 644 if (p.fs.qsize > limit) 645 errx(EX_DATAERR, "2 <= queue size <= %ld", limit); 646 } 647 if (p.fs.flags_fs & DN_IS_RED) { 648 size_t len; 649 int lookup_depth, avg_pkt_size; 650 double s, idle, weight, w_q; 651 struct clockinfo ck; 652 int t; 653 654 if (p.fs.min_th >= p.fs.max_th) 655 errx(EX_DATAERR, "min_th %d must be < than max_th %d", 656 p.fs.min_th, p.fs.max_th); 657 if (p.fs.max_th == 0) 658 errx(EX_DATAERR, "max_th must be > 0"); 659 660 len = sizeof(int); 661 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth", 662 &lookup_depth, &len, NULL, 0) == -1) 663 errx(1, "sysctlbyname(\"%s\")", 664 "net.inet.ip.dummynet.red_lookup_depth"); 665 if (lookup_depth == 0) 666 errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth" 667 " must be greater than zero"); 668 669 len = sizeof(int); 670 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size", 671 &avg_pkt_size, &len, NULL, 0) == -1) 672 673 errx(1, "sysctlbyname(\"%s\")", 674 "net.inet.ip.dummynet.red_avg_pkt_size"); 675 if (avg_pkt_size == 0) 676 errx(EX_DATAERR, 677 "net.inet.ip.dummynet.red_avg_pkt_size must" 678 " be greater than zero"); 679 680 len = sizeof(struct clockinfo); 681 if (sysctlbyname("kern.clockrate", &ck, &len, NULL, 0) == -1) 682 errx(1, "sysctlbyname(\"%s\")", "kern.clockrate"); 683 684 /* 685 * Ticks needed for sending a medium-sized packet. 686 * Unfortunately, when we are configuring a WF2Q+ queue, we 687 * do not have bandwidth information, because that is stored 688 * in the parent pipe, and also we have multiple queues 689 * competing for it. So we set s=0, which is not very 690 * correct. But on the other hand, why do we want RED with 691 * WF2Q+ ? 692 */ 693 if (p.bandwidth==0) /* this is a WF2Q+ queue */ 694 s = 0; 695 else 696 s = (double)ck.hz * avg_pkt_size * 8 / p.bandwidth; 697 698 /* 699 * max idle time (in ticks) before avg queue size becomes 0. 700 * NOTA: (3/w_q) is approx the value x so that 701 * (1-w_q)^x < 10^-3. 702 */ 703 w_q = ((double)p.fs.w_q) / (1 << SCALE_RED); 704 idle = s * 3. / w_q; 705 p.fs.lookup_step = (int)idle / lookup_depth; 706 if (!p.fs.lookup_step) 707 p.fs.lookup_step = 1; 708 weight = 1 - w_q; 709 for (t = p.fs.lookup_step; t > 1; --t) 710 weight *= 1 - w_q; 711 p.fs.lookup_weight = (int)(weight * (1 << SCALE_RED)); 712 } 713 i = do_cmd(IP_DUMMYNET_CONFIGURE, &p, sizeof p); 714 if (i) 715 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE"); 716} 717