hostapd/src/drivers/linux_ioctl.c

/*
 * Linux ioctl helper functions for driver wrappers
 * Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "utils/includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.h>

#include "utils/common.h"
#include "linux_ioctl.h"


int linux_set_iface_flags(int sock, const char *ifname, int dev_up)
{
	struct ifreq ifr;

	if (sock < 0)
		return -1;

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);

	if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
		wpa_printf(MSG_ERROR, "Could not read interface %s flags: %s",
			   ifname, strerror(errno));
		return -1;
	}

	if (dev_up) {
		if (ifr.ifr_flags & IFF_UP)
			return 0;
		ifr.ifr_flags |= IFF_UP;
	} else {
		if (!(ifr.ifr_flags & IFF_UP))
			return 0;
		ifr.ifr_flags &= ~IFF_UP;
	}

	if (ioctl(sock, SIOCSIFFLAGS, &ifr) != 0) {
		wpa_printf(MSG_ERROR, "Could not set interface %s flags: %s",
			   ifname, strerror(errno));
		return -1;
	}

	return 0;
}


int linux_get_ifhwaddr(int sock, const char *ifname, u8 *addr)
{
	struct ifreq ifr;

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
	if (ioctl(sock, SIOCGIFHWADDR, &ifr)) {
		wpa_printf(MSG_ERROR, "Could not get interface %s hwaddr: %s",
			   ifname, strerror(errno));
		return -1;
	}

	if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
		wpa_printf(MSG_ERROR, "%s: Invalid HW-addr family 0x%04x",
			   ifname, ifr.ifr_hwaddr.sa_family);
		return -1;
	}
	os_memcpy(addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

	return 0;
}


int linux_set_ifhwaddr(int sock, const char *ifname, const u8 *addr)
{
	struct ifreq ifr;

	os_memset(&ifr, 0, sizeof(ifr));
	os_strlcpy(ifr.ifr_name, ifname, IFNAMSIZ);
	os_memcpy(ifr.ifr_hwaddr.sa_data, addr, ETH_ALEN);
	ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;

	if (ioctl(sock, SIOCSIFHWADDR, &ifr)) {
		wpa_printf(MSG_DEBUG, "Could not set interface %s hwaddr: %s",
			   ifname, strerror(errno));
		return -1;
	}

	return 0;
}