/*

 * 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 <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"

		"		 [ interval TIME ] [ ecn | noecn ]\n"

		"		 [ ce_threshold TIME ]\n");

}

static int codel_parse_opt(struct qdisc_util *qu, int argc, char **argv,

			   struct nlmsghdr *n, const char *dev)

{

	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 = addattr_nest(n, 1024, TCA_OPTIONS);

	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));

	addattr_nest_end(n, 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,

};