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/*
* q_red.c RED.
*
* 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#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 "utils.h"
#include "tc_util.h"
#include "tc_red.h"
static void explain(void)
{
fprintf(stderr, "Usage: ... red limit BYTES min BYTES max BYTES avpkt BYTES burst PACKETS\n");
fprintf(stderr, " probability PROBABILITY bandwidth KBPS\n");
}
#define usage() return(-1)
static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
{
int ok=0;
struct tc_red_qopt opt;
unsigned burst = 0;
unsigned avpkt = 0;
double probability = 0.02;
unsigned rate = 0;
int wlog;
__u8 sbuf[256];
struct rtattr *tail;
memset(&opt, 0, sizeof(opt));
while (argc > 0) {
if (strcmp(*argv, "limit") == 0) {
NEXT_ARG();
if (get_size(&opt.limit, *argv)) {
fprintf(stderr, "Illegal \"limit\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "min") == 0) {
NEXT_ARG();
if (get_size(&opt.qth_min, *argv)) {
fprintf(stderr, "Illegal \"min\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "max") == 0) {
NEXT_ARG();
if (get_size(&opt.qth_max, *argv)) {
fprintf(stderr, "Illegal \"max\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "burst") == 0) {
NEXT_ARG();
if (get_unsigned(&burst, *argv, 0)) {
fprintf(stderr, "Illegal \"burst\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "avpkt") == 0) {
NEXT_ARG();
if (get_size(&avpkt, *argv)) {
fprintf(stderr, "Illegal \"avpkt\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "probability") == 0) {
NEXT_ARG();
if (sscanf(*argv, "%lg", &probability) != 1) {
fprintf(stderr, "Illegal \"probability\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "bandwidth") == 0) {
NEXT_ARG();
if (get_rate(&rate, *argv)) {
fprintf(stderr, "Illegal \"bandwidth\"\n");
return -1;
}
ok++;
} else if (strcmp(*argv, "help") == 0) {
explain();
return -1;
} else {
fprintf(stderr, "What is \"%s\"?\n", *argv);
explain();
return -1;
}
argc--; argv++;
}
if (!ok)
return 0;
if (rate == 0)
get_rate(&rate, "10Mbit");
if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt) {
fprintf(stderr, "Required parameter (min, max, burst, limit, avpket) is missing\n");
return -1;
}
if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
fprintf(stderr, "RED: failed to calculate EWMA constant.\n");
return -1;
}
if (wlog >= 10)
fprintf(stderr, "RED: WARNING. Burst %d seems to be to large.\n", burst);
opt.Wlog = wlog;
if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
fprintf(stderr, "RED: failed to calculate probability.\n");
return -1;
}
opt.Plog = wlog;
if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) {
fprintf(stderr, "RED: failed to calculate idle damping table.\n");
return -1;
}
opt.Scell_log = wlog;
tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt));
addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256);
tail->rta_len = (((void*)n)+NLMSG_ALIGN(n->nlmsg_len)) - (void*)tail;
return 0;
}
static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_RED_STAB+1];
struct tc_red_qopt *qopt;
SPRINT_BUF(b1);
SPRINT_BUF(b2);
SPRINT_BUF(b3);
if (opt == NULL)
return 0;
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, TCA_RED_STAB, RTA_DATA(opt), RTA_PAYLOAD(opt));
if (tb[TCA_RED_PARMS] == NULL)
return -1;
qopt = RTA_DATA(tb[TCA_RED_PARMS]);
if (RTA_PAYLOAD(tb[TCA_RED_PARMS]) < sizeof(*qopt))
return -1;
fprintf(f, "limit %s min %s max %s ",
sprint_size(qopt->limit, b1),
sprint_size(qopt->qth_min, b2),
sprint_size(qopt->qth_max, b3));
if (show_details) {
fprintf(f, "ewma %u Plog %u Scell_log %u",
qopt->Wlog, qopt->Plog, qopt->Scell_log);
}
return 0;
}
static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
{
return 0;
}
struct qdisc_util red_util = {
NULL,
"red",
red_parse_opt,
red_print_opt,
red_print_xstats,
};
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