148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
/*
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* q_delay.c DELAY.
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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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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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, "Usage: ... delay latency TIME rate KBPS [ mtu BYTES ]\n");
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fprintf(stderr, " [ limit BYTES]\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 delay_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_dly_qopt opt;
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unsigned mtu=1500, rate=0;
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int ok = 0;
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memset(&opt, 0, sizeof(opt));
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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 (opt.limit || rate) {
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fprintf(stderr, "Double \"limit/rate\" spec\n");
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return -1;
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}
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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, "rate") == 0) {
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NEXT_ARG();
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if (rate) {
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fprintf(stderr, "Double \"rate\" spec\n");
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return -1;
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}
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if (get_rate(&rate, *argv)) {
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explain1("rate");
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "mtu") == 0) {
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NEXT_ARG();
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if (get_size(&mtu, *argv)) {
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explain1("mtu");
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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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if (!ok)
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return 0;
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if (!opt.latency) {
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fprintf(stderr, "Latency is required\n");
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return -1;
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}
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if (!opt.limit && !rate) {
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fprintf(stderr, "Either \"limit\" or \"rate\" are required.\n");
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return -1;
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}
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/* Compute delay bandwith product as limit */
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if (opt.limit == 0)
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opt.limit = ((double)rate * (double)opt.latency/1000000.);
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addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));
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return 0;
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}
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static int delay_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct tc_dly_qopt *qopt;
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SPRINT_BUF(b1);
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SPRINT_BUF(b2);
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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, "delay limit %s latency %s ",
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sprint_size(qopt->limit, b1),
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sprint_usecs(qopt->latency, b2));
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return 0;
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}
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static int delay_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 delay_util = {
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NULL,
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"delay",
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delay_parse_opt,
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delay_print_opt,
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delay_print_xstats,
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};
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