/*

 * f_cgroup.c		Control Group Classifier

 *

 *		This program is free software; you can distribute 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:	Thomas Graf <tgraf@infradead.org>

 *

 */

#include <stdio.h>

#include <stdlib.h>

#include "utils.h"

#include "tc_util.h"

#include "m_ematch.h"

static void explain(void)

{

	fprintf(stderr, "Usage: ... cgroup [ match EMATCH_TREE ]\n");

	fprintf(stderr, "                  [ action ACTION_SPEC ]\n");

}

static int cgroup_parse_opt(struct filter_util *qu, char *handle,

			   int argc, char **argv, struct nlmsghdr *n)

{

	struct tcmsg *t = NLMSG_DATA(n);

	struct rtattr *tail;

	long h = 0;

	if (handle) {

		h = strtol(handle, NULL, 0);

		if (h == LONG_MIN || h == LONG_MAX) {

			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",

			    handle);

			return -1;

		}

	}

	t->tcm_handle = h;

	tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));

	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);

	while (argc > 0) {

		if (matches(*argv, "match") == 0) {

			NEXT_ARG();

			if (parse_ematch(&argc, &argv, TCA_CGROUP_EMATCHES, n)) {

				fprintf(stderr, "Illegal \"ematch\"\n");

				return -1;

			}

			continue;

		} else if (matches(*argv, "action") == 0) {

			NEXT_ARG();

			if (parse_action(&argc, &argv, TCA_CGROUP_ACT, n)) {

				fprintf(stderr, "Illegal \"action\"\n");

				return -1;

			}

			continue;

		} else if (matches(*argv, "police") == 0) {

			NEXT_ARG();

			if (parse_police(&argc, &argv, TCA_CGROUP_POLICE, n)) {

				fprintf(stderr, "Illegal \"police\"\n");

				return -1;

			}

			continue;

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

			explain();

			return -1;

		} else {

			fprintf(stderr, "What is \"%s\"?\n", *argv);

			explain();

			return -1;

		}

	}

	tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;

	return 0;

}

static int cgroup_print_opt(struct filter_util *qu, FILE *f,

			   struct rtattr *opt, __u32 handle)

{

	struct rtattr *tb[TCA_CGROUP_MAX+1];

	if (opt == NULL)

		return 0;

	parse_rtattr_nested(tb, TCA_CGROUP_MAX, opt);

	if (handle)

		fprintf(f, "handle 0x%x ", handle);

	if (tb[TCA_CGROUP_EMATCHES])

		print_ematch(f, tb[TCA_CGROUP_EMATCHES]);

	if (tb[TCA_CGROUP_POLICE]) {

		fprintf(f, "\n");

		tc_print_police(f, tb[TCA_CGROUP_POLICE]);

	}

	if (tb[TCA_CGROUP_ACT])

		tc_print_action(f, tb[TCA_CGROUP_ACT], 0);

	return 0;

}

struct filter_util cgroup_filter_util = {

	.id = "cgroup",

	.parse_fopt = cgroup_parse_opt,

	.print_fopt = cgroup_print_opt,

};