/*
* Codel - The Controlled-Delay Active Queue Management algorithm
*
* Copyright (C) 2011-2012 Kathleen Nichols <nichols@pollere.com>
* Copyright (C) 2011-2012 Van Jacobson <van@pollere.com>
* Copyright (C) 2012 Michael D. Taht <dave.taht@bufferbloat.net>
* Copyright (C) 2012,2015 Eric Dumazet <edumazet@google.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#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"
static void explain(void)
{
fprintf(stderr, "Usage: ... codel [ limit PACKETS ] [ target TIME ]\n");
fprintf(stderr, " [ interval TIME ] [ ecn | noecn ]\n");
fprintf(stderr, " [ ce_threshold TIME ]\n");
}
static int codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,
struct nlmsghdr *n)
{
unsigned int limit = 0;
unsigned int target = 0;
unsigned int interval = 0;
unsigned int ce_threshold = ~0U;
int ecn = -1;
struct rtattr *tail;
while (argc > 0) {
if (strcmp(*argv, "limit") == 0) {
NEXT_ARG();
if (get_unsigned(&limit, *argv, 0)) {
fprintf(stderr, "Illegal \"limit\"\n");
return -1;
}
} else if (strcmp(*argv, "target") == 0) {
NEXT_ARG();
if (get_time(&target, *argv)) {
fprintf(stderr, "Illegal \"target\"\n");
return -1;
}
} else if (strcmp(*argv, "ce_threshold") == 0) {
NEXT_ARG();
if (get_time(&ce_threshold, *argv)) {
fprintf(stderr, "Illegal \"ce_threshold\"\n");
return -1;
}
} else if (strcmp(*argv, "interval") == 0) {
NEXT_ARG();
if (get_time(&interval, *argv)) {
fprintf(stderr, "Illegal \"interval\"\n");
return -1;
}
} else if (strcmp(*argv, "ecn") == 0) {
ecn = 1;
} else if (strcmp(*argv, "noecn") == 0) {
ecn = 0;
} 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, NULL, 0);
if (limit)
addattr_l(n, 1024, TCA_CODEL_LIMIT, &limit, sizeof(limit));
if (interval)
addattr_l(n, 1024, TCA_CODEL_INTERVAL, &interval, sizeof(interval));
if (target)
addattr_l(n, 1024, TCA_CODEL_TARGET, &target, sizeof(target));
if (ecn != -1)
addattr_l(n, 1024, TCA_CODEL_ECN, &ecn, sizeof(ecn));
if (ce_threshold != ~0U)
addattr_l(n, 1024, TCA_CODEL_CE_THRESHOLD,
&ce_threshold, sizeof(ce_threshold));
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
}
static int codel_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
{
struct rtattr *tb[TCA_CODEL_MAX + 1];
unsigned int limit;
unsigned int interval;
unsigned int target;
unsigned int ecn;
unsigned int ce_threshold;
SPRINT_BUF(b1);
if (opt == NULL)
return 0;
parse_rtattr_nested(tb, TCA_CODEL_MAX, opt);
if (tb[TCA_CODEL_LIMIT] &&
RTA_PAYLOAD(tb[TCA_CODEL_LIMIT]) >= sizeof(__u32)) {
limit = rta_getattr_u32(tb[TCA_CODEL_LIMIT]);
fprintf(f, "limit %up ", limit);
}
if (tb[TCA_CODEL_TARGET] &&
RTA_PAYLOAD(tb[TCA_CODEL_TARGET]) >= sizeof(__u32)) {
target = rta_getattr_u32(tb[TCA_CODEL_TARGET]);
fprintf(f, "target %s ", sprint_time(target, b1));
}
if (tb[TCA_CODEL_CE_THRESHOLD] &&
RTA_PAYLOAD(tb[TCA_CODEL_CE_THRESHOLD]) >= sizeof(__u32)) {
ce_threshold = rta_getattr_u32(tb[TCA_CODEL_CE_THRESHOLD]);
fprintf(f, "ce_threshold %s ", sprint_time(ce_threshold, b1));
}
if (tb[TCA_CODEL_INTERVAL] &&
RTA_PAYLOAD(tb[TCA_CODEL_INTERVAL]) >= sizeof(__u32)) {
interval = rta_getattr_u32(tb[TCA_CODEL_INTERVAL]);
fprintf(f, "interval %s ", sprint_time(interval, b1));
}
if (tb[TCA_CODEL_ECN] &&
RTA_PAYLOAD(tb[TCA_CODEL_ECN]) >= sizeof(__u32)) {
ecn = rta_getattr_u32(tb[TCA_CODEL_ECN]);
if (ecn)
fprintf(f, "ecn ");
}
return 0;
}
static int codel_print_xstats(struct qdisc_util *qu, FILE *f,
struct rtattr *xstats)
{
struct tc_codel_xstats _st = {}, *st;
SPRINT_BUF(b1);
if (xstats == NULL)
return 0;
st = RTA_DATA(xstats);
if (RTA_PAYLOAD(xstats) < sizeof(*st)) {
memcpy(&_st, st, RTA_PAYLOAD(xstats));
st = &_st;
}
fprintf(f, " count %u lastcount %u ldelay %s",
st->count, st->lastcount, sprint_time(st->ldelay, b1));
if (st->dropping)
fprintf(f, " dropping");
if (st->drop_next < 0)
fprintf(f, " drop_next -%s", sprint_time(-st->drop_next, b1));
else
fprintf(f, " drop_next %s", sprint_time(st->drop_next, b1));
fprintf(f, "\n maxpacket %u ecn_mark %u drop_overlimit %u",
st->maxpacket, st->ecn_mark, st->drop_overlimit);
if (st->ce_mark)
fprintf(f, " ce_mark %u", st->ce_mark);
return 0;
}
struct qdisc_util codel_qdisc_util = {
.id = "codel",
.parse_qopt = codel_parse_opt,
.print_qopt = codel_print_opt,
.print_xstats = codel_print_xstats,
};