--- /dev/null
+/*
+ * q_netem.c NETEM.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Stephen Hemminger <shemminger@osdl.org>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.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" \
+" [ drop PERCENT [CORRELATION]] \n" \
+" [ duplicate PERCENT [CORRELATION]]\n" \
+" [ distribution {uniform|normal|pareto|paretonormal} ]\n" \
+" [ gap PACKETS ]\n");
+}
+
+static void explain1(const char *arg)
+{
+ fprintf(stderr, "Illegal \"%s\"\n", arg);
+}
+
+#define usage() return(-1)
+
+/*
+ * Simplistic file parser for distrbution data.
+ * Format is:
+ * # comment line(s)
+ * data0 data1
+ */
+#define MAXDIST 65536
+static int get_distribution(const char *type, __s16 *data)
+{
+ FILE *f;
+ int n;
+ long x;
+ size_t len;
+ char *line = NULL;
+ char name[128];
+
+ snprintf(name, sizeof(name), "/usr/lib/tc/%s.dist", type);
+ if ((f = fopen(name, "r")) == 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 >= MAXDIST) {
+ fprintf(stderr, "%s: too much data\n",
+ name);
+ n = -1;
+ goto error;
+ }
+ data[n++] = x;
+ }
+ }
+ error:
+ free(line);
+ fclose(f);
+ return n;
+}
+
+static int isnumber(const char *arg)
+{
+ char *p;
+ (void) strtod(arg, &p);
+ return (p != arg);
+}
+
+#define NEXT_IS_NUMBER() (NEXT_ARG_OK() && isnumber(argv[1]))
+
+/* 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 t;
+
+ if(get_usecs(&t, str))
+ return -1;
+
+ *ticks = tc_core_usec2tick(t);
+ return 0;
+}
+
+static char *sprint_ticks(__u32 ticks, char *buf)
+{
+ return sprint_usecs(tc_core_tick2usec(ticks), buf);
+}
+
+
+static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+ size_t dist_size = 0;
+ struct rtattr *tail;
+ struct tc_netem_qopt opt;
+ struct tc_netem_corr cor;
+ __s16 dist_data[MAXDIST];
+
+ memset(&opt, 0, sizeof(opt));
+ opt.limit = 1000;
+ memset(&cor, 0, sizeof(cor));
+
+ while (argc > 0) {
+ 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();
+ if (get_percent(&cor.delay_corr,
+ *argv)) {
+ explain1("latency");
+ return -1;
+ }
+ }
+ }
+ } else if (matches(*argv, "loss") == 0 ||
+ matches(*argv, "drop") == 0) {
+ NEXT_ARG();
+ if (get_percent(&opt.loss, *argv)) {
+ explain1("loss");
+ return -1;
+ }
+ if (NEXT_IS_NUMBER()) {
+ NEXT_ARG();
+ if (get_percent(&cor.loss_corr, *argv)) {
+ explain1("loss");
+ 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_size = get_distribution(*argv, dist_data);
+ if (dist_size < 0)
+ return -1;
+ } else if (strcmp(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "What is \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--; argv++;
+ }
+
+ tail = NLMSG_TAIL(n);
+
+ addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
+ addattr_l(n, 1024, TCA_NETEM_CORR, &cor, sizeof(cor));
+
+ if (dist_size > 0) {
+ addattr_l(n, 32768, TCA_NETEM_DELAY_DIST,
+ dist_data, dist_size*sizeof(dist_data[0]));
+ }
+ 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;
+ struct tc_netem_qopt qopt;
+ int len = RTA_PAYLOAD(opt) - sizeof(qopt);
+ SPRINT_BUF(b1);
+
+ if (opt == NULL)
+ return 0;
+
+ 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]);
+ }
+ }
+
+ fprintf(f, "limit %d", qopt.limit);
+
+ if (qopt.latency) {
+ fprintf(f, " delay %s", sprint_ticks(qopt.latency, b1));
+
+ if (qopt.jitter) {
+ fprintf(f, " %s", sprint_ticks(qopt.jitter, b1));
+ if (cor && cor->delay_corr)
+ fprintf(f, " %s", sprint_percent(cor->delay_corr, b1));
+ }
+ }
+
+ if (qopt.loss) {
+ fprintf(f, " loss %s", sprint_percent(qopt.loss, b1));
+ if (cor && cor->loss_corr)
+ fprintf(f, " %s", sprint_percent(cor->loss_corr, b1));
+ }
+
+ if (qopt.duplicate) {
+ fprintf(f, " duplicate %s",
+ sprint_percent(qopt.duplicate, b1));
+ if (cor && cor->dup_corr)
+ fprintf(f, " %s", sprint_percent(cor->dup_corr, b1));
+ }
+
+ if (qopt.gap)
+ fprintf(f, " gap %lu", (unsigned long)qopt.gap);
+
+ return 0;
+}
+
+struct qdisc_util netem_qdisc_util = {
+ .id = "netem",
+ .parse_qopt = netem_parse_opt,
+ .print_qopt = netem_print_opt,
+};
+
git://git.onelab.eu / iproute2.git / blobdiff