2 * lib/route/qdisc/netem.c Network Emulator Qdisc
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
9 * Copyright (c) 2003-2011 Thomas Graf <tgraf@suug.ch>
14 * @defgroup qdisc_netem Network Emulator
17 * For further documentation see http://linux-net.osdl.org/index.php/Netem
21 #include <netlink-private/netlink.h>
22 #include <netlink-private/tc.h>
23 #include <netlink/netlink.h>
24 #include <netlink/utils.h>
25 #include <netlink-private/route/tc-api.h>
26 #include <netlink/route/qdisc.h>
27 #include <netlink/route/qdisc/netem.h>
30 #define SCH_NETEM_ATTR_LATENCY 0x0001
31 #define SCH_NETEM_ATTR_LIMIT 0x0002
32 #define SCH_NETEM_ATTR_LOSS 0x0004
33 #define SCH_NETEM_ATTR_GAP 0x0008
34 #define SCH_NETEM_ATTR_DUPLICATE 0x0010
35 #define SCH_NETEM_ATTR_JITTER 0x0020
36 #define SCH_NETEM_ATTR_DELAY_CORR 0x0040
37 #define SCH_NETEM_ATTR_LOSS_CORR 0x0080
38 #define SCH_NETEM_ATTR_DUP_CORR 0x0100
39 #define SCH_NETEM_ATTR_RO_PROB 0x0200
40 #define SCH_NETEM_ATTR_RO_CORR 0x0400
41 #define SCH_NETEM_ATTR_CORRUPT_PROB 0x0800
42 #define SCH_NETEM_ATTR_CORRUPT_CORR 0x1000
43 #define SCH_NETEM_ATTR_DIST 0x2000
46 static struct nla_policy netem_policy[TCA_NETEM_MAX+1] = {
47 [TCA_NETEM_CORR] = { .minlen = sizeof(struct tc_netem_corr) },
48 [TCA_NETEM_REORDER] = { .minlen = sizeof(struct tc_netem_reorder) },
49 [TCA_NETEM_CORRUPT] = { .minlen = sizeof(struct tc_netem_corrupt) },
52 static int netem_msg_parser(struct rtnl_tc *tc, void *data)
54 struct rtnl_netem *netem = data;
55 struct tc_netem_qopt *opts;
58 if (tc->tc_opts->d_size < sizeof(*opts))
61 opts = (struct tc_netem_qopt *) tc->tc_opts->d_data;
62 netem->qnm_latency = opts->latency;
63 netem->qnm_limit = opts->limit;
64 netem->qnm_loss = opts->loss;
65 netem->qnm_gap = opts->gap;
66 netem->qnm_duplicate = opts->duplicate;
67 netem->qnm_jitter = opts->jitter;
69 netem->qnm_mask = (SCH_NETEM_ATTR_LATENCY | SCH_NETEM_ATTR_LIMIT |
70 SCH_NETEM_ATTR_LOSS | SCH_NETEM_ATTR_GAP |
71 SCH_NETEM_ATTR_DUPLICATE | SCH_NETEM_ATTR_JITTER);
73 len = tc->tc_opts->d_size - sizeof(*opts);
76 struct nlattr *tb[TCA_NETEM_MAX+1];
78 err = nla_parse(tb, TCA_NETEM_MAX, (struct nlattr *)
79 (tc->tc_opts->d_data + sizeof(*opts)),
86 if (tb[TCA_NETEM_CORR]) {
87 struct tc_netem_corr cor;
89 nla_memcpy(&cor, tb[TCA_NETEM_CORR], sizeof(cor));
90 netem->qnm_corr.nmc_delay = cor.delay_corr;
91 netem->qnm_corr.nmc_loss = cor.loss_corr;
92 netem->qnm_corr.nmc_duplicate = cor.dup_corr;
94 netem->qnm_mask |= (SCH_NETEM_ATTR_DELAY_CORR |
95 SCH_NETEM_ATTR_LOSS_CORR |
96 SCH_NETEM_ATTR_DUP_CORR);
99 if (tb[TCA_NETEM_REORDER]) {
100 struct tc_netem_reorder ro;
102 nla_memcpy(&ro, tb[TCA_NETEM_REORDER], sizeof(ro));
103 netem->qnm_ro.nmro_probability = ro.probability;
104 netem->qnm_ro.nmro_correlation = ro.correlation;
106 netem->qnm_mask |= (SCH_NETEM_ATTR_RO_PROB |
107 SCH_NETEM_ATTR_RO_CORR);
110 if (tb[TCA_NETEM_CORRUPT]) {
111 struct tc_netem_corrupt corrupt;
113 nla_memcpy(&corrupt, tb[TCA_NETEM_CORRUPT], sizeof(corrupt));
114 netem->qnm_crpt.nmcr_probability = corrupt.probability;
115 netem->qnm_crpt.nmcr_correlation = corrupt.correlation;
117 netem->qnm_mask |= (SCH_NETEM_ATTR_CORRUPT_PROB |
118 SCH_NETEM_ATTR_CORRUPT_CORR);
121 /* sch_netem does not currently dump TCA_NETEM_DELAY_DIST */
122 netem->qnm_dist.dist_data = NULL;
123 netem->qnm_dist.dist_size = 0;
129 static void netem_free_data(struct rtnl_tc *tc, void *data)
131 struct rtnl_netem *netem = data;
136 free(netem->qnm_dist.dist_data);
139 static void netem_dump_line(struct rtnl_tc *tc, void *data,
140 struct nl_dump_params *p)
142 struct rtnl_netem *netem = data;
145 nl_dump(p, "limit %d", netem->qnm_limit);
148 static int netem_msg_fill_raw(struct rtnl_tc *tc, void *data,
152 struct tc_netem_qopt opts;
153 struct tc_netem_corr cor;
154 struct tc_netem_reorder reorder;
155 struct tc_netem_corrupt corrupt;
156 struct rtnl_netem *netem = data;
158 unsigned char set_correlation = 0, set_reorder = 0,
159 set_corrupt = 0, set_dist = 0;
164 memset(&opts, 0, sizeof(opts));
165 memset(&cor, 0, sizeof(cor));
166 memset(&reorder, 0, sizeof(reorder));
167 memset(&corrupt, 0, sizeof(corrupt));
169 msg->nm_nlh->nlmsg_flags |= NLM_F_REQUEST;
171 if ( netem->qnm_ro.nmro_probability != 0 ) {
172 if (netem->qnm_latency == 0) {
173 return -NLE_MISSING_ATTR;
175 if (netem->qnm_gap == 0) netem->qnm_gap = 1;
177 else if ( netem->qnm_gap ) {
178 return -NLE_MISSING_ATTR;
181 if ( netem->qnm_corr.nmc_delay != 0 ) {
182 if ( netem->qnm_latency == 0 || netem->qnm_jitter == 0) {
183 return -NLE_MISSING_ATTR;
188 if ( netem->qnm_corr.nmc_loss != 0 ) {
189 if ( netem->qnm_loss == 0 ) {
190 return -NLE_MISSING_ATTR;
195 if ( netem->qnm_corr.nmc_duplicate != 0 ) {
196 if ( netem->qnm_duplicate == 0 ) {
197 return -NLE_MISSING_ATTR;
202 if ( netem->qnm_ro.nmro_probability != 0 ) set_reorder = 1;
203 else if ( netem->qnm_ro.nmro_correlation != 0 ) {
204 return -NLE_MISSING_ATTR;
207 if ( netem->qnm_crpt.nmcr_probability != 0 ) set_corrupt = 1;
208 else if ( netem->qnm_crpt.nmcr_correlation != 0 ) {
209 return -NLE_MISSING_ATTR;
212 if ( netem->qnm_dist.dist_data && netem->qnm_dist.dist_size ) {
213 if (netem->qnm_latency == 0 || netem->qnm_jitter == 0) {
214 return -NLE_MISSING_ATTR;
217 /* Resize to accomodate the large distribution table */
218 int new_msg_len = msg->nm_size + netem->qnm_dist.dist_size *
219 sizeof(netem->qnm_dist.dist_data[0]);
221 msg->nm_nlh = (struct nlmsghdr *) realloc(msg->nm_nlh, new_msg_len);
222 if ( msg->nm_nlh == NULL )
224 msg->nm_size = new_msg_len;
229 opts.latency = netem->qnm_latency;
230 opts.limit = netem->qnm_limit ? netem->qnm_limit : 1000;
231 opts.loss = netem->qnm_loss;
232 opts.gap = netem->qnm_gap;
233 opts.duplicate = netem->qnm_duplicate;
234 opts.jitter = netem->qnm_jitter;
236 NLA_PUT(msg, TCA_OPTIONS, sizeof(opts), &opts);
238 if ( set_correlation ) {
239 cor.delay_corr = netem->qnm_corr.nmc_delay;
240 cor.loss_corr = netem->qnm_corr.nmc_loss;
241 cor.dup_corr = netem->qnm_corr.nmc_duplicate;
243 NLA_PUT(msg, TCA_NETEM_CORR, sizeof(cor), &cor);
247 reorder.probability = netem->qnm_ro.nmro_probability;
248 reorder.correlation = netem->qnm_ro.nmro_correlation;
250 NLA_PUT(msg, TCA_NETEM_REORDER, sizeof(reorder), &reorder);
254 corrupt.probability = netem->qnm_crpt.nmcr_probability;
255 corrupt.correlation = netem->qnm_crpt.nmcr_correlation;
257 NLA_PUT(msg, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt);
261 NLA_PUT(msg, TCA_NETEM_DELAY_DIST,
262 netem->qnm_dist.dist_size * sizeof(netem->qnm_dist.dist_data[0]),
263 netem->qnm_dist.dist_data);
266 /* Length specified in the TCA_OPTIONS section must span the entire
267 * remainder of the message. That's just the way that sch_netem expects it.
268 * Maybe there's a more succinct way to do this at a higher level.
270 struct nlattr* head = (struct nlattr *)(NLMSG_DATA(msg->nm_nlh) +
271 NLMSG_LENGTH(sizeof(struct tcmsg)) - NLMSG_ALIGNTO);
273 struct nlattr* tail = (struct nlattr *)(((void *) (msg->nm_nlh)) +
274 NLMSG_ALIGN(msg->nm_nlh->nlmsg_len));
276 int old_len = head->nla_len;
277 head->nla_len = (void *)tail - (void *)head;
278 msg->nm_nlh->nlmsg_len += (head->nla_len - old_len);
291 * Set limit of netem qdisc.
292 * @arg qdisc Netem qdisc to be modified.
293 * @arg limit New limit in bytes.
294 * @return 0 on success or a negative error code.
296 void rtnl_netem_set_limit(struct rtnl_qdisc *qdisc, int limit)
298 struct rtnl_netem *netem;
300 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
303 netem->qnm_limit = limit;
304 netem->qnm_mask |= SCH_NETEM_ATTR_LIMIT;
308 * Get limit of netem qdisc.
309 * @arg qdisc Netem qdisc.
310 * @return Limit in bytes or a negative error code.
312 int rtnl_netem_get_limit(struct rtnl_qdisc *qdisc)
314 struct rtnl_netem *netem;
316 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
319 if (netem->qnm_mask & SCH_NETEM_ATTR_LIMIT)
320 return netem->qnm_limit;
328 * @name Packet Re-ordering
333 * Set re-ordering gap of netem qdisc.
334 * @arg qdisc Netem qdisc to be modified.
335 * @arg gap New gap in number of packets.
336 * @return 0 on success or a negative error code.
338 void rtnl_netem_set_gap(struct rtnl_qdisc *qdisc, int gap)
340 struct rtnl_netem *netem;
342 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
345 netem->qnm_gap = gap;
346 netem->qnm_mask |= SCH_NETEM_ATTR_GAP;
350 * Get re-ordering gap of netem qdisc.
351 * @arg qdisc Netem qdisc.
352 * @return Re-ordering gap in packets or a negative error code.
354 int rtnl_netem_get_gap(struct rtnl_qdisc *qdisc)
356 struct rtnl_netem *netem;
358 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
361 if (netem->qnm_mask & SCH_NETEM_ATTR_GAP)
362 return netem->qnm_gap;
368 * Set re-ordering probability of netem qdisc.
369 * @arg qdisc Netem qdisc to be modified.
370 * @arg prob New re-ordering probability.
371 * @return 0 on success or a negative error code.
373 void rtnl_netem_set_reorder_probability(struct rtnl_qdisc *qdisc, int prob)
375 struct rtnl_netem *netem;
377 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
380 netem->qnm_ro.nmro_probability = prob;
381 netem->qnm_mask |= SCH_NETEM_ATTR_RO_PROB;
385 * Get re-ordering probability of netem qdisc.
386 * @arg qdisc Netem qdisc.
387 * @return Re-ordering probability or a negative error code.
389 int rtnl_netem_get_reorder_probability(struct rtnl_qdisc *qdisc)
391 struct rtnl_netem *netem;
393 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
396 if (netem->qnm_mask & SCH_NETEM_ATTR_RO_PROB)
397 return netem->qnm_ro.nmro_probability;
403 * Set re-order correlation probability of netem qdisc.
404 * @arg qdisc Netem qdisc to be modified.
405 * @arg prob New re-ordering correlation probability.
406 * @return 0 on success or a negative error code.
408 void rtnl_netem_set_reorder_correlation(struct rtnl_qdisc *qdisc, int prob)
410 struct rtnl_netem *netem;
412 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
415 netem->qnm_ro.nmro_correlation = prob;
416 netem->qnm_mask |= SCH_NETEM_ATTR_RO_CORR;
420 * Get re-ordering correlation probability of netem qdisc.
421 * @arg qdisc Netem qdisc.
422 * @return Re-ordering correlation probability or a negative error code.
424 int rtnl_netem_get_reorder_correlation(struct rtnl_qdisc *qdisc)
426 struct rtnl_netem *netem;
428 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
431 if (netem->qnm_mask & SCH_NETEM_ATTR_RO_CORR)
432 return netem->qnm_ro.nmro_correlation;
445 * Set corruption probability of netem qdisc.
446 * @arg qdisc Netem qdisc to be modified.
447 * @arg prob New corruption probability.
448 * @return 0 on success or a negative error code.
450 void rtnl_netem_set_corruption_probability(struct rtnl_qdisc *qdisc, int prob)
452 struct rtnl_netem *netem;
454 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
457 netem->qnm_crpt.nmcr_probability = prob;
458 netem->qnm_mask |= SCH_NETEM_ATTR_CORRUPT_PROB;
462 * Get corruption probability of netem qdisc.
463 * @arg qdisc Netem qdisc.
464 * @return Corruption probability or a negative error code.
466 int rtnl_netem_get_corruption_probability(struct rtnl_qdisc *qdisc)
468 struct rtnl_netem *netem;
470 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
473 if (netem->qnm_mask & SCH_NETEM_ATTR_CORRUPT_PROB)
474 return netem->qnm_crpt.nmcr_probability;
480 * Set corruption correlation probability of netem qdisc.
481 * @arg qdisc Netem qdisc to be modified.
482 * @arg prob New corruption correlation probability.
483 * @return 0 on success or a negative error code.
485 void rtnl_netem_set_corruption_correlation(struct rtnl_qdisc *qdisc, int prob)
487 struct rtnl_netem *netem;
489 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
492 netem->qnm_crpt.nmcr_correlation = prob;
493 netem->qnm_mask |= SCH_NETEM_ATTR_CORRUPT_CORR;
497 * Get corruption correlation probability of netem qdisc.
498 * @arg qdisc Netem qdisc.
499 * @return Corruption correlation probability or a negative error code.
501 int rtnl_netem_get_corruption_correlation(struct rtnl_qdisc *qdisc)
503 struct rtnl_netem *netem;
505 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
508 if (netem->qnm_mask & SCH_NETEM_ATTR_CORRUPT_CORR)
509 return netem->qnm_crpt.nmcr_correlation;
522 * Set packet loss probability of netem qdisc.
523 * @arg qdisc Netem qdisc to be modified.
524 * @arg prob New packet loss probability.
525 * @return 0 on success or a negative error code.
527 void rtnl_netem_set_loss(struct rtnl_qdisc *qdisc, int prob)
529 struct rtnl_netem *netem;
531 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
534 netem->qnm_loss = prob;
535 netem->qnm_mask |= SCH_NETEM_ATTR_LOSS;
539 * Get packet loss probability of netem qdisc.
540 * @arg qdisc Netem qdisc.
541 * @return Packet loss probability or a negative error code.
543 int rtnl_netem_get_loss(struct rtnl_qdisc *qdisc)
545 struct rtnl_netem *netem;
547 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
550 if (netem->qnm_mask & SCH_NETEM_ATTR_LOSS)
551 return netem->qnm_loss;
557 * Set packet loss correlation probability of netem qdisc.
558 * @arg qdisc Netem qdisc to be modified.
559 * @arg prob New packet loss correlation.
560 * @return 0 on success or a negative error code.
562 void rtnl_netem_set_loss_correlation(struct rtnl_qdisc *qdisc, int prob)
564 struct rtnl_netem *netem;
566 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
569 netem->qnm_corr.nmc_loss = prob;
570 netem->qnm_mask |= SCH_NETEM_ATTR_LOSS_CORR;
574 * Get packet loss correlation probability of netem qdisc.
575 * @arg qdisc Netem qdisc.
576 * @return Packet loss correlation probability or a negative error code.
578 int rtnl_netem_get_loss_correlation(struct rtnl_qdisc *qdisc)
580 struct rtnl_netem *netem;
582 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
585 if (netem->qnm_mask & SCH_NETEM_ATTR_LOSS_CORR)
586 return netem->qnm_corr.nmc_loss;
594 * @name Packet Duplication
599 * Set packet duplication probability of netem qdisc.
600 * @arg qdisc Netem qdisc to be modified.
601 * @arg prob New packet duplication probability.
602 * @return 0 on success or a negative error code.
604 void rtnl_netem_set_duplicate(struct rtnl_qdisc *qdisc, int prob)
606 struct rtnl_netem *netem;
608 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
611 netem->qnm_duplicate = prob;
612 netem->qnm_mask |= SCH_NETEM_ATTR_DUPLICATE;
616 * Get packet duplication probability of netem qdisc.
617 * @arg qdisc Netem qdisc.
618 * @return Packet duplication probability or a negative error code.
620 int rtnl_netem_get_duplicate(struct rtnl_qdisc *qdisc)
622 struct rtnl_netem *netem;
624 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
627 if (netem->qnm_mask & SCH_NETEM_ATTR_DUPLICATE)
628 return netem->qnm_duplicate;
634 * Set packet duplication correlation probability of netem qdisc.
635 * @arg qdisc Netem qdisc to be modified.
636 * @arg prob New packet duplication correlation probability.
637 * @return 0 on sucess or a negative error code.
639 void rtnl_netem_set_duplicate_correlation(struct rtnl_qdisc *qdisc, int prob)
641 struct rtnl_netem *netem;
643 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
646 netem->qnm_corr.nmc_duplicate = prob;
647 netem->qnm_mask |= SCH_NETEM_ATTR_DUP_CORR;
651 * Get packet duplication correlation probability of netem qdisc.
652 * @arg qdisc Netem qdisc.
653 * @return Packet duplication correlation probability or a negative error code.
655 int rtnl_netem_get_duplicate_correlation(struct rtnl_qdisc *qdisc)
657 struct rtnl_netem *netem;
659 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
662 if (netem->qnm_mask & SCH_NETEM_ATTR_DUP_CORR)
663 return netem->qnm_corr.nmc_duplicate;
676 * Set packet delay of netem qdisc.
677 * @arg qdisc Netem qdisc to be modified.
678 * @arg delay New packet delay in micro seconds.
679 * @return 0 on success or a negative error code.
681 void rtnl_netem_set_delay(struct rtnl_qdisc *qdisc, int delay)
683 struct rtnl_netem *netem;
685 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
688 netem->qnm_latency = nl_us2ticks(delay);
689 netem->qnm_mask |= SCH_NETEM_ATTR_LATENCY;
693 * Get packet delay of netem qdisc.
694 * @arg qdisc Netem qdisc.
695 * @return Packet delay in micro seconds or a negative error code.
697 int rtnl_netem_get_delay(struct rtnl_qdisc *qdisc)
699 struct rtnl_netem *netem;
701 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
704 if (netem->qnm_mask & SCH_NETEM_ATTR_LATENCY)
705 return nl_ticks2us(netem->qnm_latency);
711 * Set packet delay jitter of netem qdisc.
712 * @arg qdisc Netem qdisc to be modified.
713 * @arg jitter New packet delay jitter in micro seconds.
714 * @return 0 on success or a negative error code.
716 void rtnl_netem_set_jitter(struct rtnl_qdisc *qdisc, int jitter)
718 struct rtnl_netem *netem;
720 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
723 netem->qnm_jitter = nl_us2ticks(jitter);
724 netem->qnm_mask |= SCH_NETEM_ATTR_JITTER;
728 * Get packet delay jitter of netem qdisc.
729 * @arg qdisc Netem qdisc.
730 * @return Packet delay jitter in micro seconds or a negative error code.
732 int rtnl_netem_get_jitter(struct rtnl_qdisc *qdisc)
734 struct rtnl_netem *netem;
736 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
739 if (netem->qnm_mask & SCH_NETEM_ATTR_JITTER)
740 return nl_ticks2us(netem->qnm_jitter);
746 * Set packet delay correlation probability of netem qdisc.
747 * @arg qdisc Netem qdisc to be modified.
748 * @arg prob New packet delay correlation probability.
750 void rtnl_netem_set_delay_correlation(struct rtnl_qdisc *qdisc, int prob)
752 struct rtnl_netem *netem;
754 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
757 netem->qnm_corr.nmc_delay = prob;
758 netem->qnm_mask |= SCH_NETEM_ATTR_DELAY_CORR;
762 * Get packet delay correlation probability of netem qdisc.
763 * @arg qdisc Netem qdisc.
764 * @return Packet delay correlation probability or a negative error code.
766 int rtnl_netem_get_delay_correlation(struct rtnl_qdisc *qdisc)
768 struct rtnl_netem *netem;
770 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
773 if (netem->qnm_mask & SCH_NETEM_ATTR_DELAY_CORR)
774 return netem->qnm_corr.nmc_delay;
780 * Get the size of the distribution table.
781 * @arg qdisc Netem qdisc.
782 * @return Distribution table size or a negative error code.
784 int rtnl_netem_get_delay_distribution_size(struct rtnl_qdisc *qdisc)
786 struct rtnl_netem *netem;
788 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
791 if (netem->qnm_mask & SCH_NETEM_ATTR_DIST)
792 return netem->qnm_dist.dist_size;
798 * Get a pointer to the distribution table.
799 * @arg qdisc Netem qdisc.
800 * @arg dist_ptr The pointer to set.
801 * @return Negative error code on failure or 0 on success.
803 int rtnl_netem_get_delay_distribution(struct rtnl_qdisc *qdisc, int16_t **dist_ptr)
805 struct rtnl_netem *netem;
807 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
810 if (netem->qnm_mask & SCH_NETEM_ATTR_DIST) {
811 *dist_ptr = netem->qnm_dist.dist_data;
818 * Set the delay distribution. Latency/jitter must be set before applying.
819 * @arg qdisc Netem qdisc.
820 * @arg dist_type The name of the distribution (type, file, path/file).
821 * @return 0 on success, error code on failure.
823 int rtnl_netem_set_delay_distribution(struct rtnl_qdisc *qdisc, const char *dist_type) {
824 struct rtnl_netem *netem;
826 if (!(netem = rtnl_tc_data(TC_CAST(qdisc))))
835 char dist_suffix[] = ".dist";
837 /* If the given filename already ends in .dist, don't append it later */
838 char *test_suffix = strstr(dist_type, dist_suffix);
839 if (test_suffix != NULL && strlen(test_suffix) == 5)
840 strcpy(dist_suffix, "");
842 /* Check several locations for the dist file */
843 char *test_path[] = { "", "./", "/usr/lib/tc/", "/usr/lib64/tc/", "/usr/local/lib/tc/" };
845 for (i = 0; i < ARRAY_SIZE(test_path); i++) {
846 snprintf(name, NAME_MAX, "%s%s%s", test_path[i], dist_type, dist_suffix);
847 if ((f = fopen(name, "r")))
852 return -nl_syserr2nlerr(errno);
854 netem->qnm_dist.dist_data = (int16_t *) calloc (MAXDIST, sizeof(int16_t));
856 line = (char *) calloc (sizeof(char), len + 1);
858 while (getline(&line, &len, f) != -1) {
861 if (*line == '\n' || *line == '#')
864 for (p = line; ; p = endp) {
865 long x = strtol(p, &endp, 0);
866 if (endp == p) break;
873 netem->qnm_dist.dist_data[n++] = x;
879 netem->qnm_dist.dist_size = n;
880 netem->qnm_mask |= SCH_NETEM_ATTR_DIST;
888 static struct rtnl_tc_ops netem_ops = {
890 .to_type = RTNL_TC_TYPE_QDISC,
891 .to_size = sizeof(struct rtnl_netem),
892 .to_msg_parser = netem_msg_parser,
893 .to_free_data = netem_free_data,
894 .to_dump[NL_DUMP_LINE] = netem_dump_line,
895 .to_msg_fill_raw = netem_msg_fill_raw,
898 static void __init netem_init(void)
900 rtnl_tc_register(&netem_ops);
903 static void __exit netem_exit(void)
905 rtnl_tc_unregister(&netem_ops);