1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 Nuno Antunes <nuno.antunes@gmail.com> 5 * Copyright (c) 2007 Alexander Motin <mav@freebsd.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * ng_car - An implementation of committed access rate for netgraph 34 * 35 * TODO: 36 * - Sanitize input config values (impose some limits) 37 * - Implement internal packet painting (possibly using mbuf tags) 38 * - Implement color-aware mode 39 * - Implement DSCP marking for IPv4 40 */ 41 42 #include <sys/param.h> 43 #include <sys/errno.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 48 #include <netgraph/ng_message.h> 49 #include <netgraph/ng_parse.h> 50 #include <netgraph/netgraph.h> 51 #include <netgraph/ng_car.h> 52 53 #define NG_CAR_QUEUE_SIZE 100 /* Maximum queue size for SHAPE mode */ 54 #define NG_CAR_QUEUE_MIN_TH 8 /* Minimum RED threshold for SHAPE mode */ 55 56 /* Hook private info */ 57 struct hookinfo { 58 hook_p hook; /* this (source) hook */ 59 hook_p dest; /* destination hook */ 60 61 int64_t tc; /* committed token bucket counter */ 62 int64_t te; /* exceeded/peak token bucket counter */ 63 struct bintime lastRefill; /* last token refill time */ 64 65 struct ng_car_hookconf conf; /* hook configuration */ 66 struct ng_car_hookstats stats; /* hook stats */ 67 68 struct mbuf *q[NG_CAR_QUEUE_SIZE]; /* circular packet queue */ 69 u_int q_first; /* first queue element */ 70 u_int q_last; /* last queue element */ 71 struct callout q_callout; /* periodic queue processing routine */ 72 struct mtx q_mtx; /* queue mutex */ 73 }; 74 75 /* Private information for each node instance */ 76 struct privdata { 77 node_p node; /* the node itself */ 78 struct hookinfo upper; /* hook to upper layers */ 79 struct hookinfo lower; /* hook to lower layers */ 80 }; 81 typedef struct privdata *priv_p; 82 83 static ng_constructor_t ng_car_constructor; 84 static ng_rcvmsg_t ng_car_rcvmsg; 85 static ng_shutdown_t ng_car_shutdown; 86 static ng_newhook_t ng_car_newhook; 87 static ng_rcvdata_t ng_car_rcvdata; 88 static ng_disconnect_t ng_car_disconnect; 89 90 static void ng_car_refillhook(struct hookinfo *h); 91 static void ng_car_schedule(struct hookinfo *h); 92 void ng_car_q_event(node_p node, hook_p hook, void *arg, int arg2); 93 static void ng_car_enqueue(struct hookinfo *h, item_p item); 94 95 /* Parse type for struct ng_car_hookstats */ 96 static const struct ng_parse_struct_field ng_car_hookstats_type_fields[] 97 = NG_CAR_HOOKSTATS; 98 static const struct ng_parse_type ng_car_hookstats_type = { 99 &ng_parse_struct_type, 100 &ng_car_hookstats_type_fields 101 }; 102 103 /* Parse type for struct ng_car_bulkstats */ 104 static const struct ng_parse_struct_field ng_car_bulkstats_type_fields[] 105 = NG_CAR_BULKSTATS(&ng_car_hookstats_type); 106 static const struct ng_parse_type ng_car_bulkstats_type = { 107 &ng_parse_struct_type, 108 &ng_car_bulkstats_type_fields 109 }; 110 111 /* Parse type for struct ng_car_hookconf */ 112 static const struct ng_parse_struct_field ng_car_hookconf_type_fields[] 113 = NG_CAR_HOOKCONF; 114 static const struct ng_parse_type ng_car_hookconf_type = { 115 &ng_parse_struct_type, 116 &ng_car_hookconf_type_fields 117 }; 118 119 /* Parse type for struct ng_car_bulkconf */ 120 static const struct ng_parse_struct_field ng_car_bulkconf_type_fields[] 121 = NG_CAR_BULKCONF(&ng_car_hookconf_type); 122 static const struct ng_parse_type ng_car_bulkconf_type = { 123 &ng_parse_struct_type, 124 &ng_car_bulkconf_type_fields 125 }; 126 127 /* Command list */ 128 static struct ng_cmdlist ng_car_cmdlist[] = { 129 { 130 NGM_CAR_COOKIE, 131 NGM_CAR_GET_STATS, 132 "getstats", 133 NULL, 134 &ng_car_bulkstats_type, 135 }, 136 { 137 NGM_CAR_COOKIE, 138 NGM_CAR_CLR_STATS, 139 "clrstats", 140 NULL, 141 NULL, 142 }, 143 { 144 NGM_CAR_COOKIE, 145 NGM_CAR_GETCLR_STATS, 146 "getclrstats", 147 NULL, 148 &ng_car_bulkstats_type, 149 }, 150 151 { 152 NGM_CAR_COOKIE, 153 NGM_CAR_GET_CONF, 154 "getconf", 155 NULL, 156 &ng_car_bulkconf_type, 157 }, 158 { 159 NGM_CAR_COOKIE, 160 NGM_CAR_SET_CONF, 161 "setconf", 162 &ng_car_bulkconf_type, 163 NULL, 164 }, 165 { 0 } 166 }; 167 168 /* Netgraph node type descriptor */ 169 static struct ng_type ng_car_typestruct = { 170 .version = NG_ABI_VERSION, 171 .name = NG_CAR_NODE_TYPE, 172 .constructor = ng_car_constructor, 173 .rcvmsg = ng_car_rcvmsg, 174 .shutdown = ng_car_shutdown, 175 .newhook = ng_car_newhook, 176 .rcvdata = ng_car_rcvdata, 177 .disconnect = ng_car_disconnect, 178 .cmdlist = ng_car_cmdlist, 179 }; 180 NETGRAPH_INIT(car, &ng_car_typestruct); 181 182 /* 183 * Node constructor 184 */ 185 static int 186 ng_car_constructor(node_p node) 187 { 188 priv_p priv; 189 190 /* Initialize private descriptor. */ 191 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO); 192 193 NG_NODE_SET_PRIVATE(node, priv); 194 priv->node = node; 195 196 /* 197 * Arbitrary default values 198 */ 199 200 priv->upper.hook = NULL; 201 priv->upper.dest = NULL; 202 priv->upper.tc = priv->upper.conf.cbs = NG_CAR_CBS_MIN; 203 priv->upper.te = priv->upper.conf.ebs = NG_CAR_EBS_MIN; 204 priv->upper.conf.cir = NG_CAR_CIR_DFLT; 205 priv->upper.conf.green_action = NG_CAR_ACTION_FORWARD; 206 priv->upper.conf.yellow_action = NG_CAR_ACTION_FORWARD; 207 priv->upper.conf.red_action = NG_CAR_ACTION_DROP; 208 priv->upper.conf.mode = 0; 209 getbinuptime(&priv->upper.lastRefill); 210 priv->upper.q_first = 0; 211 priv->upper.q_last = 0; 212 ng_callout_init(&priv->upper.q_callout); 213 mtx_init(&priv->upper.q_mtx, "ng_car_u", NULL, MTX_DEF); 214 215 priv->lower.hook = NULL; 216 priv->lower.dest = NULL; 217 priv->lower.tc = priv->lower.conf.cbs = NG_CAR_CBS_MIN; 218 priv->lower.te = priv->lower.conf.ebs = NG_CAR_EBS_MIN; 219 priv->lower.conf.cir = NG_CAR_CIR_DFLT; 220 priv->lower.conf.green_action = NG_CAR_ACTION_FORWARD; 221 priv->lower.conf.yellow_action = NG_CAR_ACTION_FORWARD; 222 priv->lower.conf.red_action = NG_CAR_ACTION_DROP; 223 priv->lower.conf.mode = 0; 224 priv->lower.lastRefill = priv->upper.lastRefill; 225 priv->lower.q_first = 0; 226 priv->lower.q_last = 0; 227 ng_callout_init(&priv->lower.q_callout); 228 mtx_init(&priv->lower.q_mtx, "ng_car_l", NULL, MTX_DEF); 229 230 return (0); 231 } 232 233 /* 234 * Add a hook. 235 */ 236 static int 237 ng_car_newhook(node_p node, hook_p hook, const char *name) 238 { 239 const priv_p priv = NG_NODE_PRIVATE(node); 240 241 if (strcmp(name, NG_CAR_HOOK_LOWER) == 0) { 242 priv->lower.hook = hook; 243 priv->upper.dest = hook; 244 bzero(&priv->lower.stats, sizeof(priv->lower.stats)); 245 NG_HOOK_SET_PRIVATE(hook, &priv->lower); 246 } else if (strcmp(name, NG_CAR_HOOK_UPPER) == 0) { 247 priv->upper.hook = hook; 248 priv->lower.dest = hook; 249 bzero(&priv->upper.stats, sizeof(priv->upper.stats)); 250 NG_HOOK_SET_PRIVATE(hook, &priv->upper); 251 } else 252 return (EINVAL); 253 return(0); 254 } 255 256 /* 257 * Data has arrived. 258 */ 259 static int 260 ng_car_rcvdata(hook_p hook, item_p item ) 261 { 262 struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook); 263 struct mbuf *m; 264 int error = 0; 265 u_int len; 266 267 /* If queue is not empty now then enqueue packet. */ 268 if (hinfo->q_first != hinfo->q_last) { 269 ng_car_enqueue(hinfo, item); 270 return (0); 271 } 272 273 m = NGI_M(item); 274 275 #define NG_CAR_PERFORM_MATCH_ACTION(a) \ 276 do { \ 277 switch (a) { \ 278 case NG_CAR_ACTION_FORWARD: \ 279 /* Do nothing. */ \ 280 break; \ 281 case NG_CAR_ACTION_MARK: \ 282 /* XXX find a way to mark packets (mbuf tag?) */ \ 283 ++hinfo->stats.errors; \ 284 break; \ 285 case NG_CAR_ACTION_DROP: \ 286 default: \ 287 /* Drop packet and return. */ \ 288 NG_FREE_ITEM(item); \ 289 ++hinfo->stats.dropped_pkts; \ 290 return (0); \ 291 } \ 292 } while (0) 293 294 /* Packet is counted as 128 tokens for better resolution */ 295 if (hinfo->conf.opt & NG_CAR_COUNT_PACKETS) { 296 len = 128; 297 } else { 298 len = m->m_pkthdr.len; 299 } 300 301 /* Check committed token bucket. */ 302 if (hinfo->tc - len >= 0) { 303 /* This packet is green. */ 304 ++hinfo->stats.green_pkts; 305 hinfo->tc -= len; 306 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.green_action); 307 } else { 308 309 /* Refill only if not green without it. */ 310 ng_car_refillhook(hinfo); 311 312 /* Check committed token bucket again after refill. */ 313 if (hinfo->tc - len >= 0) { 314 /* This packet is green */ 315 ++hinfo->stats.green_pkts; 316 hinfo->tc -= len; 317 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.green_action); 318 319 /* If not green and mode is SHAPE, enqueue packet. */ 320 } else if (hinfo->conf.mode == NG_CAR_SHAPE) { 321 ng_car_enqueue(hinfo, item); 322 return (0); 323 324 /* If not green and mode is RED, calculate probability. */ 325 } else if (hinfo->conf.mode == NG_CAR_RED) { 326 /* Is packet is bigger then extended burst? */ 327 if (len - (hinfo->tc - len) > hinfo->conf.ebs) { 328 /* This packet is definitely red. */ 329 ++hinfo->stats.red_pkts; 330 hinfo->te = 0; 331 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.red_action); 332 333 /* Use token bucket to simulate RED-like drop 334 probability. */ 335 } else if (hinfo->te + (len - hinfo->tc) < 336 hinfo->conf.ebs) { 337 /* This packet is yellow */ 338 ++hinfo->stats.yellow_pkts; 339 hinfo->te += len - hinfo->tc; 340 /* Go to negative tokens. */ 341 hinfo->tc -= len; 342 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.yellow_action); 343 } else { 344 /* This packet is probably red. */ 345 ++hinfo->stats.red_pkts; 346 hinfo->te = 0; 347 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.red_action); 348 } 349 /* If not green and mode is SINGLE/DOUBLE RATE. */ 350 } else { 351 /* Check extended token bucket. */ 352 if (hinfo->te - len >= 0) { 353 /* This packet is yellow */ 354 ++hinfo->stats.yellow_pkts; 355 hinfo->te -= len; 356 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.yellow_action); 357 } else { 358 /* This packet is red */ 359 ++hinfo->stats.red_pkts; 360 NG_CAR_PERFORM_MATCH_ACTION(hinfo->conf.red_action); 361 } 362 } 363 } 364 365 #undef NG_CAR_PERFORM_MATCH_ACTION 366 367 NG_FWD_ITEM_HOOK(error, item, hinfo->dest); 368 if (error != 0) 369 ++hinfo->stats.errors; 370 ++hinfo->stats.passed_pkts; 371 372 return (error); 373 } 374 375 /* 376 * Receive a control message. 377 */ 378 static int 379 ng_car_rcvmsg(node_p node, item_p item, hook_p lasthook) 380 { 381 const priv_p priv = NG_NODE_PRIVATE(node); 382 struct ng_mesg *resp = NULL; 383 int error = 0; 384 struct ng_mesg *msg; 385 386 NGI_GET_MSG(item, msg); 387 switch (msg->header.typecookie) { 388 case NGM_CAR_COOKIE: 389 switch (msg->header.cmd) { 390 case NGM_CAR_GET_STATS: 391 case NGM_CAR_GETCLR_STATS: 392 { 393 struct ng_car_bulkstats *bstats; 394 395 NG_MKRESPONSE(resp, msg, 396 sizeof(*bstats), M_NOWAIT); 397 if (resp == NULL) { 398 error = ENOMEM; 399 break; 400 } 401 bstats = (struct ng_car_bulkstats *)resp->data; 402 403 bcopy(&priv->upper.stats, &bstats->downstream, 404 sizeof(bstats->downstream)); 405 bcopy(&priv->lower.stats, &bstats->upstream, 406 sizeof(bstats->upstream)); 407 } 408 if (msg->header.cmd == NGM_CAR_GET_STATS) 409 break; 410 case NGM_CAR_CLR_STATS: 411 bzero(&priv->upper.stats, 412 sizeof(priv->upper.stats)); 413 bzero(&priv->lower.stats, 414 sizeof(priv->lower.stats)); 415 break; 416 case NGM_CAR_GET_CONF: 417 { 418 struct ng_car_bulkconf *bconf; 419 420 NG_MKRESPONSE(resp, msg, 421 sizeof(*bconf), M_NOWAIT); 422 if (resp == NULL) { 423 error = ENOMEM; 424 break; 425 } 426 bconf = (struct ng_car_bulkconf *)resp->data; 427 428 bcopy(&priv->upper.conf, &bconf->downstream, 429 sizeof(bconf->downstream)); 430 bcopy(&priv->lower.conf, &bconf->upstream, 431 sizeof(bconf->upstream)); 432 /* Convert internal 1/(8*128) of pps into pps */ 433 if (bconf->downstream.opt & NG_CAR_COUNT_PACKETS) { 434 bconf->downstream.cir /= 1024; 435 bconf->downstream.pir /= 1024; 436 bconf->downstream.cbs /= 128; 437 bconf->downstream.ebs /= 128; 438 } 439 if (bconf->upstream.opt & NG_CAR_COUNT_PACKETS) { 440 bconf->upstream.cir /= 1024; 441 bconf->upstream.pir /= 1024; 442 bconf->upstream.cbs /= 128; 443 bconf->upstream.ebs /= 128; 444 } 445 } 446 break; 447 case NGM_CAR_SET_CONF: 448 { 449 struct ng_car_bulkconf *const bconf = 450 (struct ng_car_bulkconf *)msg->data; 451 452 /* Check for invalid or illegal config. */ 453 if (msg->header.arglen != sizeof(*bconf)) { 454 error = EINVAL; 455 break; 456 } 457 /* Convert pps into internal 1/(8*128) of pps */ 458 if (bconf->downstream.opt & NG_CAR_COUNT_PACKETS) { 459 bconf->downstream.cir *= 1024; 460 bconf->downstream.pir *= 1024; 461 bconf->downstream.cbs *= 125; 462 bconf->downstream.ebs *= 125; 463 } 464 if (bconf->upstream.opt & NG_CAR_COUNT_PACKETS) { 465 bconf->upstream.cir *= 1024; 466 bconf->upstream.pir *= 1024; 467 bconf->upstream.cbs *= 125; 468 bconf->upstream.ebs *= 125; 469 } 470 if ((bconf->downstream.cir > 1000000000) || 471 (bconf->downstream.pir > 1000000000) || 472 (bconf->upstream.cir > 1000000000) || 473 (bconf->upstream.pir > 1000000000) || 474 (bconf->downstream.cbs == 0 && 475 bconf->downstream.ebs == 0) || 476 (bconf->upstream.cbs == 0 && 477 bconf->upstream.ebs == 0)) 478 { 479 error = EINVAL; 480 break; 481 } 482 if ((bconf->upstream.mode == NG_CAR_SHAPE) && 483 (bconf->upstream.cir == 0)) { 484 error = EINVAL; 485 break; 486 } 487 if ((bconf->downstream.mode == NG_CAR_SHAPE) && 488 (bconf->downstream.cir == 0)) { 489 error = EINVAL; 490 break; 491 } 492 493 /* Copy downstream config. */ 494 bcopy(&bconf->downstream, &priv->upper.conf, 495 sizeof(priv->upper.conf)); 496 priv->upper.tc = priv->upper.conf.cbs; 497 if (priv->upper.conf.mode == NG_CAR_RED || 498 priv->upper.conf.mode == NG_CAR_SHAPE) { 499 priv->upper.te = 0; 500 } else { 501 priv->upper.te = priv->upper.conf.ebs; 502 } 503 504 /* Copy upstream config. */ 505 bcopy(&bconf->upstream, &priv->lower.conf, 506 sizeof(priv->lower.conf)); 507 priv->lower.tc = priv->lower.conf.cbs; 508 if (priv->lower.conf.mode == NG_CAR_RED || 509 priv->lower.conf.mode == NG_CAR_SHAPE) { 510 priv->lower.te = 0; 511 } else { 512 priv->lower.te = priv->lower.conf.ebs; 513 } 514 } 515 break; 516 default: 517 error = EINVAL; 518 break; 519 } 520 break; 521 default: 522 error = EINVAL; 523 break; 524 } 525 NG_RESPOND_MSG(error, node, item, resp); 526 NG_FREE_MSG(msg); 527 return (error); 528 } 529 530 /* 531 * Do local shutdown processing. 532 */ 533 static int 534 ng_car_shutdown(node_p node) 535 { 536 const priv_p priv = NG_NODE_PRIVATE(node); 537 538 ng_uncallout(&priv->upper.q_callout, node); 539 ng_uncallout(&priv->lower.q_callout, node); 540 mtx_destroy(&priv->upper.q_mtx); 541 mtx_destroy(&priv->lower.q_mtx); 542 NG_NODE_UNREF(priv->node); 543 free(priv, M_NETGRAPH); 544 return (0); 545 } 546 547 /* 548 * Hook disconnection. 549 * 550 * For this type, removal of the last link destroys the node. 551 */ 552 static int 553 ng_car_disconnect(hook_p hook) 554 { 555 struct hookinfo *const hinfo = NG_HOOK_PRIVATE(hook); 556 const node_p node = NG_HOOK_NODE(hook); 557 const priv_p priv = NG_NODE_PRIVATE(node); 558 559 if (hinfo) { 560 /* Purge queue if not empty. */ 561 while (hinfo->q_first != hinfo->q_last) { 562 NG_FREE_M(hinfo->q[hinfo->q_first]); 563 hinfo->q_first++; 564 if (hinfo->q_first >= NG_CAR_QUEUE_SIZE) 565 hinfo->q_first = 0; 566 } 567 /* Remove hook refs. */ 568 if (hinfo->hook == priv->upper.hook) 569 priv->lower.dest = NULL; 570 else 571 priv->upper.dest = NULL; 572 hinfo->hook = NULL; 573 } 574 /* Already shutting down? */ 575 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 576 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) 577 ng_rmnode_self(NG_HOOK_NODE(hook)); 578 return (0); 579 } 580 581 /* 582 * Hook's token buckets refillment. 583 */ 584 static void 585 ng_car_refillhook(struct hookinfo *h) 586 { 587 struct bintime newt, deltat; 588 unsigned int deltat_us; 589 590 /* Get current time. */ 591 getbinuptime(&newt); 592 593 /* Get time delta since last refill. */ 594 deltat = newt; 595 bintime_sub(&deltat, &h->lastRefill); 596 597 /* Time must go forward. */ 598 if (deltat.sec < 0) { 599 h->lastRefill = newt; 600 return; 601 } 602 603 /* But not too far forward. */ 604 if (deltat.sec >= 1000) { 605 deltat_us = (1000 << 20); 606 } else { 607 /* convert bintime to the 1/(2^20) of sec */ 608 deltat_us = (deltat.sec << 20) + (deltat.frac >> 44); 609 } 610 611 if (h->conf.mode == NG_CAR_SINGLE_RATE) { 612 int64_t delta; 613 /* Refill committed token bucket. */ 614 h->tc += (h->conf.cir * deltat_us) >> 23; 615 delta = h->tc - h->conf.cbs; 616 if (delta > 0) { 617 h->tc = h->conf.cbs; 618 619 /* Refill exceeded token bucket. */ 620 h->te += delta; 621 if (h->te > ((int64_t)h->conf.ebs)) 622 h->te = h->conf.ebs; 623 } 624 625 } else if (h->conf.mode == NG_CAR_DOUBLE_RATE) { 626 /* Refill committed token bucket. */ 627 h->tc += (h->conf.cir * deltat_us) >> 23; 628 if (h->tc > ((int64_t)h->conf.cbs)) 629 h->tc = h->conf.cbs; 630 631 /* Refill peak token bucket. */ 632 h->te += (h->conf.pir * deltat_us) >> 23; 633 if (h->te > ((int64_t)h->conf.ebs)) 634 h->te = h->conf.ebs; 635 636 } else { /* RED or SHAPE mode. */ 637 /* Refill committed token bucket. */ 638 h->tc += (h->conf.cir * deltat_us) >> 23; 639 if (h->tc > ((int64_t)h->conf.cbs)) 640 h->tc = h->conf.cbs; 641 } 642 643 /* Remember this moment. */ 644 h->lastRefill = newt; 645 } 646 647 /* 648 * Schedule callout when we will have required tokens. 649 */ 650 static void 651 ng_car_schedule(struct hookinfo *hinfo) 652 { 653 int delay; 654 655 delay = (-(hinfo->tc)) * hz * 8 / hinfo->conf.cir + 1; 656 657 ng_callout(&hinfo->q_callout, NG_HOOK_NODE(hinfo->hook), hinfo->hook, 658 delay, &ng_car_q_event, NULL, 0); 659 } 660 661 /* 662 * Queue processing callout handler. 663 */ 664 void 665 ng_car_q_event(node_p node, hook_p hook, void *arg, int arg2) 666 { 667 struct hookinfo *hinfo = NG_HOOK_PRIVATE(hook); 668 struct mbuf *m; 669 int error; 670 671 /* Refill tokens for time we have slept. */ 672 ng_car_refillhook(hinfo); 673 674 /* If we have some tokens */ 675 while (hinfo->tc >= 0) { 676 677 /* Send packet. */ 678 m = hinfo->q[hinfo->q_first]; 679 NG_SEND_DATA_ONLY(error, hinfo->dest, m); 680 if (error != 0) 681 ++hinfo->stats.errors; 682 ++hinfo->stats.passed_pkts; 683 684 /* Get next one. */ 685 hinfo->q_first++; 686 if (hinfo->q_first >= NG_CAR_QUEUE_SIZE) 687 hinfo->q_first = 0; 688 689 /* Stop if none left. */ 690 if (hinfo->q_first == hinfo->q_last) 691 break; 692 693 /* If we have more packet, try it. */ 694 m = hinfo->q[hinfo->q_first]; 695 if (hinfo->conf.opt & NG_CAR_COUNT_PACKETS) { 696 hinfo->tc -= 128; 697 } else { 698 hinfo->tc -= m->m_pkthdr.len; 699 } 700 } 701 702 /* If something left */ 703 if (hinfo->q_first != hinfo->q_last) 704 /* Schedule queue processing. */ 705 ng_car_schedule(hinfo); 706 } 707 708 /* 709 * Enqueue packet. 710 */ 711 static void 712 ng_car_enqueue(struct hookinfo *hinfo, item_p item) 713 { 714 struct mbuf *m; 715 int len; 716 717 NGI_GET_M(item, m); 718 NG_FREE_ITEM(item); 719 720 /* Lock queue mutex. */ 721 mtx_lock(&hinfo->q_mtx); 722 723 /* Calculate used queue length. */ 724 len = hinfo->q_last - hinfo->q_first; 725 if (len < 0) 726 len += NG_CAR_QUEUE_SIZE; 727 728 /* If queue is overflowed or we have no RED tokens. */ 729 if ((len >= (NG_CAR_QUEUE_SIZE - 1)) || 730 (hinfo->te + len >= NG_CAR_QUEUE_SIZE)) { 731 /* Drop packet. */ 732 ++hinfo->stats.red_pkts; 733 ++hinfo->stats.dropped_pkts; 734 NG_FREE_M(m); 735 736 hinfo->te = 0; 737 } else { 738 /* This packet is yellow. */ 739 ++hinfo->stats.yellow_pkts; 740 741 /* Enqueue packet. */ 742 hinfo->q[hinfo->q_last] = m; 743 hinfo->q_last++; 744 if (hinfo->q_last >= NG_CAR_QUEUE_SIZE) 745 hinfo->q_last = 0; 746 747 /* Use RED tokens. */ 748 if (len > NG_CAR_QUEUE_MIN_TH) 749 hinfo->te += len - NG_CAR_QUEUE_MIN_TH; 750 751 /* If this is a first packet in the queue. */ 752 if (len == 0) { 753 if (hinfo->conf.opt & NG_CAR_COUNT_PACKETS) { 754 hinfo->tc -= 128; 755 } else { 756 hinfo->tc -= m->m_pkthdr.len; 757 } 758 759 /* Schedule queue processing. */ 760 ng_car_schedule(hinfo); 761 } 762 } 763 764 /* Unlock queue mutex. */ 765 mtx_unlock(&hinfo->q_mtx); 766 } 767