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148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
/*
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* q_netem.c NETEM.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Stephen Hemminger <shemminger@osdl.org>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include "utils.h"
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#include "tc_util.h"
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: ... netem latency TIME [ jitter TIME ] [ limit PACKETS] \n" \
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" [ loss PERCENT ] [ duplicate PERCENT ]\n" \
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" [ gap PACKETS]\n");
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}
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static void explain1(const char *arg)
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{
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fprintf(stderr, "Illegal \"%s\"\n", arg);
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}
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#define usage() return(-1)
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static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
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struct nlmsghdr *n)
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{
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struct tc_netem_qopt opt;
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int ok = 0;
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memset(&opt, 0, sizeof(opt));
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opt.limit = 1000;
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while (argc > 0) {
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if (matches(*argv, "limit") == 0) {
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NEXT_ARG();
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if (get_size(&opt.limit, *argv)) {
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explain1("limit");
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return -1;
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}
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ok++;
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} else if (matches(*argv, "latency") == 0) {
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NEXT_ARG();
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if (get_usecs(&opt.latency, *argv)) {
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explain1("latency");
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return -1;
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}
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ok++;
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} else if (matches(*argv, "loss") == 0) {
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NEXT_ARG();
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if (get_percent(&opt.loss, *argv)) {
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explain1("loss");
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return -1;
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}
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ok++;
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} else if (matches(*argv, "gap") == 0) {
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NEXT_ARG();
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if (get_u32(&opt.gap, *argv, 0)) {
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explain1("gap");
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return -1;
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}
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ok++;
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} else if (matches(*argv, "duplicate") == 0) {
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NEXT_ARG();
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if (get_percent(&opt.duplicate, *argv)) {
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explain1("duplicate");
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return -1;
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}
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ok++;
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} else if (matches(*argv, "jitter") == 0) {
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NEXT_ARG();
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if (get_usecs(&opt.jitter, *argv)) {
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explain1("jitter");
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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argc--; argv++;
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}
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return ok ? addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt)) : 0;
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}
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static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct tc_netem_qopt *qopt;
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SPRINT_BUF(b1);
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if (opt == NULL)
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return 0;
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if (RTA_PAYLOAD(opt) < sizeof(*qopt))
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return -1;
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qopt = RTA_DATA(opt);
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fprintf(f, "limit %d", qopt->limit);
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if (qopt->latency)
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fprintf(f, " latency %s",
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sprint_usecs(qopt->latency, b1));
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if (qopt->jitter)
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fprintf(f, " jitter %s", sprint_usecs(qopt->jitter, b1));
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if (qopt->loss)
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fprintf(f, " loss %s",
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sprint_percent(qopt->loss, b1));
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if (qopt->gap)
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fprintf(f, " gap %lu", (unsigned long)qopt->gap);
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return 0;
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}
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static int netem_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
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{
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return 0;
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}
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struct qdisc_util netem_util = {
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.id = "netem",
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.parse_qopt = netem_parse_opt,
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.print_qopt = netem_print_opt,
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.print_xstats = netem_print_xstats,
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};
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