FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_car.c
1 /*-
2 * Copyright (c) 2005 Nuno Antunes <nuno.antunes@gmail.com>
3 * Copyright (c) 2007 Alexander Motin <mav@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30 /*
31 * ng_car - An implementation of commited access rate for netgraph
32 *
33 * TODO:
34 * - Sanitize input config values (impose some limits)
35 * - Implement internal packet painting (possibly using mbuf tags)
36 * - Implement color-aware mode
37 * - Implement DSCP marking for IPv4
38 */
39
40 #include <sys/param.h>
41 #include <sys/errno.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45
46 #include <netgraph/ng_message.h>
47 #include <netgraph/ng_parse.h>
48 #include <netgraph/netgraph.h>
49 #include <netgraph/ng_car.h>
50
51 #define NG_CAR_QUEUE_SIZE 100 /* Maximum queue size for SHAPE mode */
52 #define NG_CAR_QUEUE_MIN_TH 8 /* Minimum RED threshhold for SHAPE mode */
53
54 /* Hook private info */
55 struct hookinfo {
56 hook_p hook; /* this (source) hook */
57 hook_p dest; /* destination hook */
58
59 int64_t tc; /* commited token bucket counter */
60 int64_t te; /* exceeded/peak token bucket counter */
61 struct bintime lastRefill; /* last token refill time */
62
63 struct ng_car_hookconf conf; /* hook configuration */
64 struct ng_car_hookstats stats; /* hook stats */
65
66 struct mbuf *q[NG_CAR_QUEUE_SIZE]; /* circular packet queue */
67 u_int q_first; /* first queue element */
68 u_int q_last; /* last queue element */
69 struct callout q_callout; /* periodic queue processing routine */
70 struct mtx q_mtx; /* queue mutex */
71 };
72
73 /* Private information for each node instance */
74 struct privdata {
75 node_p node; /* the node itself */
76 struct hookinfo upper; /* hook to upper layers */
77 struct hookinfo lower; /* hook to lower layers */
78 };
79 typedef struct privdata *priv_p;
80
81 static ng_constructor_t ng_car_constructor;
82 static ng_rcvmsg_t ng_car_rcvmsg;
83 static ng_shutdown_t ng_car_shutdown;
84 static ng_newhook_t ng_car_newhook;
85 static ng_rcvdata_t ng_car_rcvdata;
86 static ng_disconnect_t ng_car_disconnect;
87
88 static void ng_car_refillhook(struct hookinfo *h);
89 static void ng_car_schedule(struct hookinfo *h);
90 void ng_car_q_event(node_p node, hook_p hook, void *arg, int arg2);
91 static void ng_car_enqueue(struct hookinfo *h, item_p item);
92
93 /* Parse type for struct ng_car_hookstats */
94 static const struct ng_parse_struct_field ng_car_hookstats_type_fields[]
95 = NG_CAR_HOOKSTATS;
96 static const struct ng_parse_type ng_car_hookstats_type = {
97 &ng_parse_struct_type,
98 &ng_car_hookstats_type_fields
99 };
100
101 /* Parse type for struct ng_car_bulkstats */
102 static const struct ng_parse_struct_field ng_car_bulkstats_type_fields[]
103 = NG_CAR_BULKSTATS(&ng_car_hookstats_type);
104 static const struct ng_parse_type ng_car_bulkstats_type = {
105 &ng_parse_struct_type,
106 &ng_car_bulkstats_type_fields
107 };
108
109 /* Parse type for struct ng_car_hookconf */
110 static const struct ng_parse_struct_field ng_car_hookconf_type_fields[]
111 = NG_CAR_HOOKCONF;
112 static const struct ng_parse_type ng_car_hookconf_type = {
113 &ng_parse_struct_type,
114 &ng_car_hookconf_type_fields
115 };
116
117 /* Parse type for struct ng_car_bulkconf */
118 static const struct ng_parse_struct_field ng_car_bulkconf_type_fields[]
119 = NG_CAR_BULKCONF(&ng_car_hookconf_type);
120 static const struct ng_parse_type ng_car_bulkconf_type = {
121 &ng_parse_struct_type,
122 &ng_car_bulkconf_type_fields
123 };
124
125 /* Command list */
126 static struct ng_cmdlist ng_car_cmdlist[] = {
127 {
128 NGM_CAR_COOKIE,
129 NGM_CAR_GET_STATS,
130 "getstats",
131 NULL,
132 &ng_car_bulkstats_type,
133 },
134 {
135 NGM_CAR_COOKIE,
136 NGM_CAR_CLR_STATS,
137 "clrstats",
138 NULL,
139 NULL,
140 },
141 {
142 NGM_CAR_COOKIE,
143 NGM_CAR_GETCLR_STATS,
144 "getclrstats",
145 NULL,
146 &ng_car_bulkstats_type,
147 },
148
149 {
150 NGM_CAR_COOKIE,
151 NGM_CAR_GET_CONF,
152 "getconf",
153 NULL,
154 &ng_car_bulkconf_type,
155 },
156 {
157 NGM_CAR_COOKIE,
158 NGM_CAR_SET_CONF,
159 "setconf",
160 &ng_car_bulkconf_type,
161 NULL,
162 },
163 { 0 }
164 };
165
166 /* Netgraph node type descriptor */
167 static struct ng_type ng_car_typestruct = {
168 .version = NG_ABI_VERSION,
169 .name = NG_CAR_NODE_TYPE,
170 .constructor = ng_car_constructor,
171 .rcvmsg = ng_car_rcvmsg,
172 .shutdown = ng_car_shutdown,
173 .newhook = ng_car_newhook,
174 .rcvdata = ng_car_rcvdata,
175 .disconnect = ng_car_disconnect,
176 .cmdlist = ng_car_cmdlist,
177 };
178 NETGRAPH_INIT(car, &ng_car_typestruct);
179
180 /*
181 * Node constructor
182 */
183 static int
184 ng_car_constructor(node_p node)
185 {
186 priv_p priv;
187
188 /* Initialize private descriptor. */
189 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
190 if (priv == NULL)
191 return (ENOMEM);
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.droped_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 commited 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 commited 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 probaly 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 commited 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 commited 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 commited 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.droped_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 }
Cache object: 946975ce1ab1e223a9213d3ea7f5360d
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