Adding upstream version 6.1.0.upstream/6.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 838 insertions, 0 deletions

diff --git a/tc/q_netem.c b/tc/q_netem.c
new file mode 100644
index 0000000..26402e9
--- /dev/null
+++ b/tc/q_netem.c
@@ -0,0 +1,838 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Author:	Stephen Hemminger <shemminger@linux-foundation.org>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <errno.h>
+
+#include "utils.h"
+#include "tc_util.h"
+#include "tc_common.h"
+
+static void explain(void)
+{
+	fprintf(stderr,
+		"Usage: ... netem [ limit PACKETS ]\n"
+		"                 [ delay TIME [ JITTER [CORRELATION]]]\n"
+		"                 [ distribution {uniform|normal|pareto|paretonormal} ]\n"
+		"                 [ corrupt PERCENT [CORRELATION]]\n"
+		"                 [ duplicate PERCENT [CORRELATION]]\n"
+		"                 [ loss random PERCENT [CORRELATION]]\n"
+		"                 [ loss state P13 [P31 [P32 [P23 P14]]]\n"
+		"                 [ loss gemodel PERCENT [R [1-H [1-K]]]\n"
+		"                 [ ecn ]\n"
+		"                 [ reorder PERCENT [CORRELATION] [ gap DISTANCE ]]\n"
+		"                 [ rate RATE [PACKETOVERHEAD] [CELLSIZE] [CELLOVERHEAD]]\n"
+		"                 [ slot MIN_DELAY [MAX_DELAY] [packets MAX_PACKETS] [bytes MAX_BYTES]]\n"
+		"                 [ slot distribution {uniform|normal|pareto|paretonormal|custom}\n"
+		"                   DELAY JITTER [packets MAX_PACKETS] [bytes MAX_BYTES]]\n");
+}
+
+static void explain1(const char *arg)
+{
+	fprintf(stderr, "Illegal \"%s\"\n", arg);
+}
+
+/* Upper bound on size of distribution
+ *  really (TCA_BUF_MAX - other headers) / sizeof (__s16)
+ */
+#define MAX_DIST	(16*1024)
+
+/* Print values only if they are non-zero */
+static void __attribute__((format(printf, 2, 0)))
+__print_int_opt(const char *label_json, const char *label_fp, int val)
+{
+	print_int(PRINT_JSON, label_json, NULL, val);
+	if (val != 0)
+		print_int(PRINT_FP, NULL, label_fp, val);
+}
+#define PRINT_INT_OPT(label, val)			\
+	__print_int_opt(label, " " label " %d", (val))
+
+/* Time print prints normally with varying units, but for JSON prints
+ * in seconds (1ms vs 0.001).
+ */
+static void __attribute__((format(printf, 2, 0)))
+__print_time64(const char *label_json, const char *label_fp, __u64 val)
+{
+	SPRINT_BUF(b1);
+
+	print_string(PRINT_FP, NULL, label_fp, sprint_time64(val, b1));
+	print_float(PRINT_JSON, label_json, NULL, val / 1000000000.);
+}
+#define __PRINT_TIME64(label_json, label_fp, val)	\
+	__print_time64(label_json, label_fp " %s", (val))
+#define PRINT_TIME64(label, val) __PRINT_TIME64(label, " " label, (val))
+
+/* Percent print prints normally in percentage points, but for JSON prints
+ * an absolute value (1% vs 0.01).
+ */
+static void __attribute__((format(printf, 2, 0)))
+__print_percent(const char *label_json, const char *label_fp, __u32 per)
+{
+	print_float(PRINT_FP, NULL, label_fp, (100. * per) / UINT32_MAX);
+	print_float(PRINT_JSON, label_json, NULL, (1. * per) / UINT32_MAX);
+}
+#define __PRINT_PERCENT(label_json, label_fp, per)		\
+	__print_percent(label_json, label_fp " %g%%", (per))
+#define PRINT_PERCENT(label, per) __PRINT_PERCENT(label, " " label, (per))
+
+/* scaled value used to percent of maximum. */
+static void set_percent(__u32 *percent, double per)
+{
+	*percent = rint(per * UINT32_MAX);
+}
+
+static int get_percent(__u32 *percent, const char *str)
+{
+	double per;
+
+	if (parse_percent(&per, str))
+		return -1;
+
+	set_percent(percent, per);
+	return 0;
+}
+
+static void print_corr(bool present, __u32 value)
+{
+	if (!is_json_context()) {
+		if (present)
+			__PRINT_PERCENT("", "", value);
+	} else {
+		PRINT_PERCENT("correlation", value);
+	}
+}
+
+/*
+ * Simplistic file parser for distrbution data.
+ * Format is:
+ *	# comment line(s)
+ *	data0 data1 ...
+ */
+static int get_distribution(const char *type, __s16 *data, int maxdata)
+{
+	FILE *f;
+	int n;
+	long x;
+	size_t len;
+	char *line = NULL;
+	char name[128];
+
+	snprintf(name, sizeof(name), "%s/%s.dist", get_tc_lib(), type);
+	f = fopen(name, "r");
+	if (f == NULL) {
+		fprintf(stderr, "No distribution data for %s (%s: %s)\n",
+			type, name, strerror(errno));
+		return -1;
+	}
+
+	n = 0;
+	while (getline(&line, &len, f) != -1) {
+		char *p, *endp;
+
+		if (*line == '\n' || *line == '#')
+			continue;
+
+		for (p = line; ; p = endp) {
+			x = strtol(p, &endp, 0);
+			if (endp == p)
+				break;
+
+			if (n >= maxdata) {
+				fprintf(stderr, "%s: too much data\n",
+					name);
+				n = -1;
+				goto error;
+			}
+			data[n++] = x;
+		}
+	}
+ error:
+	free(line);
+	fclose(f);
+	return n;
+}
+
+#define NEXT_IS_NUMBER() (NEXT_ARG_OK() && isdigit(argv[1][0]))
+#define NEXT_IS_SIGNED_NUMBER() \
+	(NEXT_ARG_OK() && (isdigit(argv[1][0]) || argv[1][0] == '-'))
+
+/*
+ * Adjust for the fact that psched_ticks aren't always usecs
+ *  (based on kernel PSCHED_CLOCK configuration
+ */
+static int get_ticks(__u32 *ticks, const char *str)
+{
+	unsigned int t;
+
+	if (get_time(&t, str))
+		return -1;
+
+	if (tc_core_time2big(t)) {
+		fprintf(stderr, "Illegal %u time (too large)\n", t);
+		return -1;
+	}
+
+	*ticks = tc_core_time2tick(t);
+	return 0;
+}
+
+static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+			   struct nlmsghdr *n, const char *dev)
+{
+	int dist_size = 0;
+	int slot_dist_size = 0;
+	struct rtattr *tail;
+	struct tc_netem_qopt opt = { .limit = 1000 };
+	struct tc_netem_corr cor = {};
+	struct tc_netem_reorder reorder = {};
+	struct tc_netem_corrupt corrupt = {};
+	struct tc_netem_gimodel gimodel;
+	struct tc_netem_gemodel gemodel;
+	struct tc_netem_rate rate = {};
+	struct tc_netem_slot slot = {};
+	__s16 *dist_data = NULL;
+	__s16 *slot_dist_data = NULL;
+	__u16 loss_type = NETEM_LOSS_UNSPEC;
+	int present[__TCA_NETEM_MAX] = {};
+	__u64 rate64 = 0;
+
+	for ( ; argc > 0; --argc, ++argv) {
+		if (matches(*argv, "limit") == 0) {
+			NEXT_ARG();
+			if (get_size(&opt.limit, *argv)) {
+				explain1("limit");
+				return -1;
+			}
+		} else if (matches(*argv, "latency") == 0 ||
+			   matches(*argv, "delay") == 0) {
+			NEXT_ARG();
+			if (get_ticks(&opt.latency, *argv)) {
+				explain1("latency");
+				return -1;
+			}
+
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				if (get_ticks(&opt.jitter, *argv)) {
+					explain1("latency");
+					return -1;
+				}
+
+				if (NEXT_IS_NUMBER()) {
+					NEXT_ARG();
+					++present[TCA_NETEM_CORR];
+					if (get_percent(&cor.delay_corr, *argv)) {
+						explain1("latency");
+						return -1;
+					}
+				}
+			}
+		} else if (matches(*argv, "loss") == 0 ||
+			   matches(*argv, "drop") == 0) {
+			if (opt.loss > 0 || loss_type != NETEM_LOSS_UNSPEC) {
+				explain1("duplicate loss argument\n");
+				return -1;
+			}
+
+			NEXT_ARG();
+			/* Old (deprecated) random loss model syntax */
+			if (isdigit(argv[0][0]))
+				goto random_loss_model;
+
+			if (!strcmp(*argv, "random")) {
+				NEXT_ARG();
+random_loss_model:
+				if (get_percent(&opt.loss, *argv)) {
+					explain1("loss percent");
+					return -1;
+				}
+				if (NEXT_IS_NUMBER()) {
+					NEXT_ARG();
+					++present[TCA_NETEM_CORR];
+					if (get_percent(&cor.loss_corr, *argv)) {
+						explain1("loss correlation");
+						return -1;
+					}
+				}
+			} else if (!strcmp(*argv, "state")) {
+				double p13;
+
+				NEXT_ARG();
+				if (parse_percent(&p13, *argv)) {
+					explain1("loss p13");
+					return -1;
+				}
+
+				/* set defaults */
+				set_percent(&gimodel.p13, p13);
+				set_percent(&gimodel.p31, 1. - p13);
+				set_percent(&gimodel.p32, 0);
+				set_percent(&gimodel.p23, 1.);
+				set_percent(&gimodel.p14, 0);
+				loss_type = NETEM_LOSS_GI;
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gimodel.p31, *argv)) {
+					explain1("loss p31");
+					return -1;
+				}
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gimodel.p32, *argv)) {
+					explain1("loss p32");
+					return -1;
+				}
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gimodel.p23, *argv)) {
+					explain1("loss p23");
+					return -1;
+				}
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gimodel.p14, *argv)) {
+					explain1("loss p14");
+					return -1;
+				}
+
+			} else if (!strcmp(*argv, "gemodel")) {
+				double p;
+
+				NEXT_ARG();
+				if (parse_percent(&p, *argv)) {
+					explain1("loss gemodel p");
+					return -1;
+				}
+				set_percent(&gemodel.p, p);
+
+				/* set defaults */
+				set_percent(&gemodel.r, 1. - p);
+				set_percent(&gemodel.h, 0);
+				set_percent(&gemodel.k1, 0);
+				loss_type = NETEM_LOSS_GE;
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gemodel.r, *argv)) {
+					explain1("loss gemodel r");
+					return -1;
+				}
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gemodel.h, *argv)) {
+					explain1("loss gemodel h");
+					return -1;
+				}
+				/* netem option is "1-h" but kernel
+				 * expects "h".
+				 */
+				gemodel.h = UINT32_MAX - gemodel.h;
+
+				if (!NEXT_IS_NUMBER())
+					continue;
+				NEXT_ARG();
+				if (get_percent(&gemodel.k1, *argv)) {
+					explain1("loss gemodel k");
+					return -1;
+				}
+			} else {
+				fprintf(stderr, "Unknown loss parameter: %s\n",
+					*argv);
+				return -1;
+			}
+		} else if (matches(*argv, "ecn") == 0) {
+			present[TCA_NETEM_ECN] = 1;
+		} else if (matches(*argv, "reorder") == 0) {
+			NEXT_ARG();
+			present[TCA_NETEM_REORDER] = 1;
+			if (get_percent(&reorder.probability, *argv)) {
+				explain1("reorder");
+				return -1;
+			}
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				++present[TCA_NETEM_CORR];
+				if (get_percent(&reorder.correlation, *argv)) {
+					explain1("reorder");
+					return -1;
+				}
+			}
+		} else if (matches(*argv, "corrupt") == 0) {
+			NEXT_ARG();
+			present[TCA_NETEM_CORRUPT] = 1;
+			if (get_percent(&corrupt.probability, *argv)) {
+				explain1("corrupt");
+				return -1;
+			}
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				++present[TCA_NETEM_CORR];
+				if (get_percent(&corrupt.correlation, *argv)) {
+					explain1("corrupt");
+					return -1;
+				}
+			}
+		} else if (matches(*argv, "gap") == 0) {
+			NEXT_ARG();
+			if (get_u32(&opt.gap, *argv, 0)) {
+				explain1("gap");
+				return -1;
+			}
+		} else if (matches(*argv, "duplicate") == 0) {
+			NEXT_ARG();
+			if (get_percent(&opt.duplicate, *argv)) {
+				explain1("duplicate");
+				return -1;
+			}
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				if (get_percent(&cor.dup_corr, *argv)) {
+					explain1("duplicate");
+					return -1;
+				}
+			}
+		} else if (matches(*argv, "distribution") == 0) {
+			NEXT_ARG();
+			dist_data = calloc(sizeof(dist_data[0]), MAX_DIST);
+			dist_size = get_distribution(*argv, dist_data, MAX_DIST);
+			if (dist_size <= 0) {
+				free(dist_data);
+				return -1;
+			}
+		} else if (matches(*argv, "rate") == 0) {
+			++present[TCA_NETEM_RATE];
+			NEXT_ARG();
+			if (strchr(*argv, '%')) {
+				if (get_percent_rate64(&rate64, *argv, dev)) {
+					explain1("rate");
+					return -1;
+				}
+			} else if (get_rate64(&rate64, *argv)) {
+				explain1("rate");
+				return -1;
+			}
+			if (NEXT_IS_SIGNED_NUMBER()) {
+				NEXT_ARG();
+				if (get_s32(&rate.packet_overhead, *argv, 0)) {
+					explain1("rate");
+					return -1;
+				}
+			}
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				if (get_u32(&rate.cell_size, *argv, 0)) {
+					explain1("rate");
+					return -1;
+				}
+			}
+			if (NEXT_IS_SIGNED_NUMBER()) {
+				NEXT_ARG();
+				if (get_s32(&rate.cell_overhead, *argv, 0)) {
+					explain1("rate");
+					return -1;
+				}
+			}
+		} else if (matches(*argv, "slot") == 0) {
+			if (NEXT_IS_NUMBER()) {
+				NEXT_ARG();
+				present[TCA_NETEM_SLOT] = 1;
+				if (get_time64(&slot.min_delay, *argv)) {
+					explain1("slot min_delay");
+					return -1;
+				}
+				if (NEXT_IS_NUMBER()) {
+					NEXT_ARG();
+					if (get_time64(&slot.max_delay, *argv) ||
+					    slot.max_delay < slot.min_delay) {
+						explain1("slot max_delay");
+						return -1;
+					}
+				} else {
+					slot.max_delay = slot.min_delay;
+				}
+			} else {
+				NEXT_ARG();
+				if (strcmp(*argv, "distribution") == 0) {
+					present[TCA_NETEM_SLOT] = 1;
+					NEXT_ARG();
+					slot_dist_data = calloc(sizeof(slot_dist_data[0]), MAX_DIST);
+					if (!slot_dist_data)
+						return -1;
+					slot_dist_size = get_distribution(*argv, slot_dist_data, MAX_DIST);
+					if (slot_dist_size <= 0) {
+						free(slot_dist_data);
+						return -1;
+					}
+					NEXT_ARG();
+					if (get_time64(&slot.dist_delay, *argv)) {
+						explain1("slot delay");
+						return -1;
+					}
+					NEXT_ARG();
+					if (get_time64(&slot.dist_jitter, *argv)) {
+						explain1("slot jitter");
+						return -1;
+					}
+					if (slot.dist_jitter <= 0) {
+						fprintf(stderr, "Non-positive jitter\n");
+						return -1;
+					}
+				} else {
+					fprintf(stderr, "Unknown slot parameter: %s\n",
+						*argv);
+					return -1;
+				}
+			}
+			if (NEXT_ARG_OK() &&
+			    matches(*(argv+1), "packets") == 0) {
+				NEXT_ARG();
+				if (!NEXT_ARG_OK() ||
+				    get_s32(&slot.max_packets, *(argv+1), 0)) {
+					explain1("slot packets");
+					return -1;
+				}
+				NEXT_ARG();
+			}
+			if (NEXT_ARG_OK() &&
+			    matches(*(argv+1), "bytes") == 0) {
+				unsigned int max_bytes;
+
+				NEXT_ARG();
+				if (!NEXT_ARG_OK() ||
+				    get_size(&max_bytes, *(argv+1))) {
+					explain1("slot bytes");
+					return -1;
+				}
+				slot.max_bytes = (int) max_bytes;
+				NEXT_ARG();
+			}
+		} else {
+			if (strcmp(*argv, "help") != 0)
+				fprintf(stderr, "What is \"%s\"?\n", *argv);
+			explain();
+			return -1;
+		}
+	}
+
+	tail = NLMSG_TAIL(n);
+
+	if (reorder.probability) {
+		if (opt.latency == 0) {
+			fprintf(stderr, "reordering not possible without specifying some delay\n");
+			explain();
+			return -1;
+		}
+		if (opt.gap == 0)
+			opt.gap = 1;
+	} else if (opt.gap > 0) {
+		fprintf(stderr, "gap specified without reorder probability\n");
+		explain();
+		return -1;
+	}
+
+	if (present[TCA_NETEM_ECN]) {
+		if (opt.loss <= 0 && loss_type == NETEM_LOSS_UNSPEC) {
+			fprintf(stderr, "ecn requested without loss model\n");
+			explain();
+			return -1;
+		}
+	}
+
+	if (dist_data && (opt.latency == 0 || opt.jitter == 0)) {
+		fprintf(stderr, "distribution specified but no latency and jitter values\n");
+		explain();
+		return -1;
+	}
+
+	if (addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)) < 0)
+		return -1;
+
+	if (present[TCA_NETEM_CORR] &&
+	    addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor)) < 0)
+		return -1;
+
+	if (present[TCA_NETEM_REORDER] &&
+	    addattr_l(n, 1024, TCA_NETEM_REORDER, &reorder, sizeof(reorder)) < 0)
+		return -1;
+
+	if (present[TCA_NETEM_ECN] &&
+	    addattr_l(n, 1024, TCA_NETEM_ECN, &present[TCA_NETEM_ECN],
+		      sizeof(present[TCA_NETEM_ECN])) < 0)
+		return -1;
+
+	if (present[TCA_NETEM_CORRUPT] &&
+	    addattr_l(n, 1024, TCA_NETEM_CORRUPT, &corrupt, sizeof(corrupt)) < 0)
+		return -1;
+
+	if (present[TCA_NETEM_SLOT] &&
+	    addattr_l(n, 1024, TCA_NETEM_SLOT, &slot, sizeof(slot)) < 0)
+		return -1;
+
+	if (loss_type != NETEM_LOSS_UNSPEC) {
+		struct rtattr *start;
+
+		start = addattr_nest(n, 1024, TCA_NETEM_LOSS | NLA_F_NESTED);
+		if (loss_type == NETEM_LOSS_GI) {
+			if (addattr_l(n, 1024, NETEM_LOSS_GI,
+				      &gimodel, sizeof(gimodel)) < 0)
+				return -1;
+		} else if (loss_type == NETEM_LOSS_GE) {
+			if (addattr_l(n, 1024, NETEM_LOSS_GE,
+				      &gemodel, sizeof(gemodel)) < 0)
+				return -1;
+		} else {
+			fprintf(stderr, "loss in the weeds!\n");
+			return -1;
+		}
+
+		addattr_nest_end(n, start);
+	}
+
+	if (present[TCA_NETEM_RATE]) {
+		if (rate64 >= (1ULL << 32)) {
+			if (addattr_l(n, 1024,
+				      TCA_NETEM_RATE64, &rate64, sizeof(rate64)) < 0)
+				return -1;
+			rate.rate = ~0U;
+		} else {
+			rate.rate = rate64;
+		}
+		if (addattr_l(n, 1024, TCA_NETEM_RATE, &rate, sizeof(rate)) < 0)
+			return -1;
+	}
+
+	if (dist_data) {
+		if (addattr_l(n, MAX_DIST * sizeof(dist_data[0]),
+			      TCA_NETEM_DELAY_DIST,
+			      dist_data, dist_size * sizeof(dist_data[0])) < 0)
+			return -1;
+		free(dist_data);
+	}
+
+	if (slot_dist_data) {
+		if (addattr_l(n, MAX_DIST * sizeof(slot_dist_data[0]),
+			      TCA_NETEM_SLOT_DIST,
+			      slot_dist_data, slot_dist_size * sizeof(slot_dist_data[0])) < 0)
+			return -1;
+		free(slot_dist_data);
+	}
+	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
+	return 0;
+}
+
+static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
+{
+	const struct tc_netem_corr *cor = NULL;
+	const struct tc_netem_reorder *reorder = NULL;
+	const struct tc_netem_corrupt *corrupt = NULL;
+	const struct tc_netem_gimodel *gimodel = NULL;
+	const struct tc_netem_gemodel *gemodel = NULL;
+	int *ecn = NULL;
+	struct tc_netem_qopt qopt;
+	const struct tc_netem_rate *rate = NULL;
+	const struct tc_netem_slot *slot = NULL;
+	int len;
+	__u64 rate64 = 0;
+
+	SPRINT_BUF(b1);
+
+	if (opt == NULL)
+		return 0;
+
+	len = RTA_PAYLOAD(opt) - sizeof(qopt);
+	if (len < 0) {
+		fprintf(stderr, "options size error\n");
+		return -1;
+	}
+	memcpy(&qopt, RTA_DATA(opt), sizeof(qopt));
+
+	if (len > 0) {
+		struct rtattr *tb[TCA_NETEM_MAX+1];
+
+		parse_rtattr(tb, TCA_NETEM_MAX, RTA_DATA(opt) + sizeof(qopt),
+			     len);
+
+		if (tb[TCA_NETEM_CORR]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_CORR]) < sizeof(*cor))
+				return -1;
+			cor = RTA_DATA(tb[TCA_NETEM_CORR]);
+		}
+		if (tb[TCA_NETEM_REORDER]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_REORDER]) < sizeof(*reorder))
+				return -1;
+			reorder = RTA_DATA(tb[TCA_NETEM_REORDER]);
+		}
+		if (tb[TCA_NETEM_CORRUPT]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_CORRUPT]) < sizeof(*corrupt))
+				return -1;
+			corrupt = RTA_DATA(tb[TCA_NETEM_CORRUPT]);
+		}
+		if (tb[TCA_NETEM_LOSS]) {
+			struct rtattr *lb[NETEM_LOSS_MAX + 1];
+
+			parse_rtattr_nested(lb, NETEM_LOSS_MAX, tb[TCA_NETEM_LOSS]);
+			if (lb[NETEM_LOSS_GI])
+				gimodel = RTA_DATA(lb[NETEM_LOSS_GI]);
+			if (lb[NETEM_LOSS_GE])
+				gemodel = RTA_DATA(lb[NETEM_LOSS_GE]);
+		}
+		if (tb[TCA_NETEM_RATE]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_RATE]) < sizeof(*rate))
+				return -1;
+			rate = RTA_DATA(tb[TCA_NETEM_RATE]);
+		}
+		if (tb[TCA_NETEM_ECN]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_ECN]) < sizeof(*ecn))
+				return -1;
+			ecn = RTA_DATA(tb[TCA_NETEM_ECN]);
+		}
+		if (tb[TCA_NETEM_RATE64]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_RATE64]) < sizeof(rate64))
+				return -1;
+			rate64 = rta_getattr_u64(tb[TCA_NETEM_RATE64]);
+		}
+		if (tb[TCA_NETEM_SLOT]) {
+			if (RTA_PAYLOAD(tb[TCA_NETEM_SLOT]) < sizeof(*slot))
+				return -1;
+			slot = RTA_DATA(tb[TCA_NETEM_SLOT]);
+		}
+	}
+
+	print_uint(PRINT_ANY, "limit", "limit %d", qopt.limit);
+
+	if (qopt.latency) {
+		open_json_object("delay");
+		if (!is_json_context()) {
+			print_string(PRINT_FP, NULL, " delay %s",
+				     sprint_ticks(qopt.latency, b1));
+
+			if (qopt.jitter)
+				print_string(PRINT_FP, NULL, "  %s",
+					     sprint_ticks(qopt.jitter, b1));
+		} else {
+			print_float(PRINT_JSON, "delay", NULL,
+				    tc_core_tick2time(qopt.latency) /
+				    1000000.);
+			print_float(PRINT_JSON, "jitter", NULL,
+				    tc_core_tick2time(qopt.jitter) /
+				    1000000.);
+		}
+		print_corr(qopt.jitter && cor && cor->delay_corr,
+			   cor ? cor->delay_corr : 0);
+		close_json_object();
+	}
+
+	if (qopt.loss) {
+		open_json_object("loss-random");
+		PRINT_PERCENT("loss", qopt.loss);
+		print_corr(cor && cor->loss_corr, cor ? cor->loss_corr : 0);
+		close_json_object();
+	}
+
+	if (gimodel) {
+		open_json_object("loss-state");
+		__PRINT_PERCENT("p13", " loss state p13", gimodel->p13);
+		PRINT_PERCENT("p31", gimodel->p31);
+		PRINT_PERCENT("p32", gimodel->p32);
+		PRINT_PERCENT("p23", gimodel->p23);
+		PRINT_PERCENT("p14", gimodel->p14);
+		close_json_object();
+	}
+
+	if (gemodel) {
+		open_json_object("loss-gemodel");
+		__PRINT_PERCENT("p", " loss gemodel p", gemodel->p);
+		PRINT_PERCENT("r", gemodel->r);
+		PRINT_PERCENT("1-h", UINT32_MAX - gemodel->h);
+		PRINT_PERCENT("1-k", gemodel->k1);
+		close_json_object();
+	}
+
+	if (qopt.duplicate) {
+		open_json_object("duplicate");
+		PRINT_PERCENT("duplicate", qopt.duplicate);
+		print_corr(cor && cor->dup_corr, cor ? cor->dup_corr : 0);
+		close_json_object();
+	}
+
+	if (reorder && reorder->probability) {
+		open_json_object("reorder");
+		PRINT_PERCENT("reorder", reorder->probability);
+		print_corr(reorder->correlation, reorder->correlation);
+		close_json_object();
+	}
+
+	if (corrupt && corrupt->probability) {
+		open_json_object("corrupt");
+		PRINT_PERCENT("corrupt", corrupt->probability);
+		print_corr(corrupt->correlation, corrupt->correlation);
+		close_json_object();
+	}
+
+	if (rate && rate->rate) {
+		open_json_object("rate");
+		rate64 = rate64 ? : rate->rate;
+		tc_print_rate(PRINT_ANY, "rate", " rate %s", rate64);
+		PRINT_INT_OPT("packetoverhead", rate->packet_overhead);
+
+		print_uint(PRINT_JSON, "cellsize", NULL, rate->cell_size);
+		if (rate->cell_size)
+			print_uint(PRINT_FP, NULL, " cellsize %u", rate->cell_size);
+		PRINT_INT_OPT("celloverhead", rate->cell_overhead);
+		close_json_object();
+	}
+
+	if (slot) {
+		open_json_object("slot");
+		if (slot->dist_jitter > 0) {
+			__PRINT_TIME64("distribution", " slot distribution",
+				       slot->dist_delay);
+			__PRINT_TIME64("jitter", "", slot->dist_jitter);
+		} else {
+			__PRINT_TIME64("min-delay", " slot", slot->min_delay);
+			__PRINT_TIME64("max-delay", "", slot->max_delay);
+		}
+		PRINT_INT_OPT("packets", slot->max_packets);
+		PRINT_INT_OPT("bytes", slot->max_bytes);
+		close_json_object();
+	}
+
+	print_bool(PRINT_JSON, "ecn", NULL, ecn);
+	if (ecn)
+		print_bool(PRINT_FP, NULL, " ecn ", ecn);
+
+	print_luint(PRINT_JSON, "gap", NULL, qopt.gap);
+	if (qopt.gap)
+		print_luint(PRINT_FP, NULL, " gap %lu", qopt.gap);
+
+	return 0;
+}
+
+struct qdisc_util netem_qdisc_util = {
+	.id		= "netem",
+	.parse_qopt	= netem_parse_opt,
+	.print_qopt	= netem_print_opt,
+};