iwd/src/wiphy.c

/*
 *
 *  Wireless daemon for Linux
 *
 *  Copyright (C) 2013-2014  Intel Corporation. All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <ell/ell.h>

#include "linux/nl80211.h"
#include "src/wiphy.h"

static struct l_genl *genl = NULL;
static struct l_genl_family *nl80211 = NULL;

static void do_debug(const char *str, void *user_data)
{
	const char *prefix = user_data;

	l_info("%s%s", prefix, str);
}

static void nl80211_appeared(void *user_data)
{
	struct l_genl_msg *msg;

	l_debug("Found nl80211 interface");

	msg = l_genl_msg_new(NL80211_CMD_GET_WIPHY);

	l_genl_family_dump(nl80211, msg, NULL, NULL, NULL);
}

static void nl80211_vanished(void *user_data)
{
	l_debug("Lost nl80211 interface");
}

bool wiphy_init(void)
{
	if (genl)
		return false;

	genl = l_genl_new_default();
	if (!genl) {
		l_error("Failed to open generic netlink socket");
		return false;
	}

	if (getenv("IWD_GENL_DEBUG"))
		l_genl_set_debug(genl, do_debug, "[GENL] ", NULL);

	l_debug("Opening nl80211 interface");

	nl80211 = l_genl_family_new(genl, NL80211_GENL_NAME);
	if (!nl80211) {
		l_error("Failed to open nl80211 interface");
		goto failed;
	}

	l_genl_family_set_watches(nl80211, nl80211_appeared, nl80211_vanished,
								NULL, NULL);

	return true;

failed:
	l_genl_unref(genl);
	genl = NULL;

	return false;
}

bool wiphy_exit(void)
{
	if (!genl)
		return false;

	l_debug("Closing nl80211 interface");

	/*
	 * The generic netlink master object keeps track of all families
	 * and closing it will take care of freeing all associated resources.
	 */
	l_genl_unref(genl);
	genl = NULL;

	return true;
}