/*

 * q_skbprio.c		SKB PRIORITY QUEUE.

 *

 *		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:	Nishanth Devarajan, <ndev2021@gmail.com>

 *

 */

#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: ... <skbprio> [ limit NUMBER ]\n");

}

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

			     struct nlmsghdr *n, const char *dev)

{

	int ok = 0;

	struct tc_skbprio_qopt opt = {};

	while (argc > 0) {

		if (strcmp(*argv, "limit") == 0) {

			NEXT_ARG();

			if (get_size(&opt.limit, *argv)) {

				fprintf(stderr,

					"%s: Illegal \"limit\" value:\"%s\"\n",

					 qu->id, *argv);

				return -1;

			}

			ok++;

		}

		else if (strcmp(*argv, "help") == 0) {

			explain();

			return -1;

		} else {

			fprintf(stderr,

				"%s: unknown parameter \"%s\"\n",

				qu->id, *argv);

			explain();

			return -1;

		}

		argc--; argv++;

	}

	if (ok)

		addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));

	return 0;

}

static int skbprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)

{

	struct tc_skbprio_qopt *qopt;

	if (opt == NULL)

		return 0;

	if (RTA_PAYLOAD(opt)  < sizeof(*qopt))

		return -1;

	qopt = RTA_DATA(opt);

	fprintf(f, "limit %u ", qopt->limit);

	return 0;

}

struct qdisc_util skbprio_qdisc_util = {

	.id = "skbprio",

	.parse_qopt = skbprio_parse_opt,

	.print_qopt = skbprio_print_opt,

};