krackattacks/hostapd/driver_hostap.c

/*
 * hostapd / Kernel driver communication with Linux Host AP driver
 * Copyright (c) 2002-2007, 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 "includes.h"
#include <sys/ioctl.h>

#ifdef USE_KERNEL_HEADERS
#include <asm/types.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>   /* The L2 protocols */
#include <linux/if_arp.h>
#include <linux/wireless.h>
#else /* USE_KERNEL_HEADERS */
#include <net/if_arp.h>
#include <netpacket/packet.h>
#include "wireless_copy.h"
#endif /* USE_KERNEL_HEADERS */

#include "hostapd.h"
#include "driver.h"
#include "ieee802_1x.h"
#include "eloop.h"
#include "priv_netlink.h"
#include "ieee802_11.h"
#include "sta_info.h"
#include "hostap_common.h"
#include "hw_features.h"


struct hostap_driver_data {
	struct hostapd_data *hapd;

	char iface[IFNAMSIZ + 1];
	int sock; /* raw packet socket for driver access */
	int ioctl_sock; /* socket for ioctl() use */
	int wext_sock; /* socket for wireless events */

	int we_version;

	u8 *generic_ie;
	size_t generic_ie_len;
};


static int hostapd_ioctl(void *priv, struct prism2_hostapd_param *param,
			 int len);
static int hostap_set_iface_flags(void *priv, int dev_up);

static void handle_data(struct hostapd_data *hapd, u8 *buf, size_t len,
			u16 stype)
{
	struct ieee80211_hdr *hdr;
	u16 fc, ethertype;
	u8 *pos, *sa;
	size_t left;
	struct sta_info *sta;

	if (len < sizeof(struct ieee80211_hdr))
		return;

	hdr = (struct ieee80211_hdr *) buf;
	fc = le_to_host16(hdr->frame_control);

	if ((fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) != WLAN_FC_TODS) {
		printf("Not ToDS data frame (fc=0x%04x)\n", fc);
		return;
	}

	sa = hdr->addr2;
	sta = ap_get_sta(hapd, sa);
	if (!sta || !(sta->flags & WLAN_STA_ASSOC)) {
		printf("Data frame from not associated STA " MACSTR "\n",
		       MAC2STR(sa));
		if (sta && (sta->flags & WLAN_STA_AUTH))
			hostapd_sta_disassoc(
				hapd, sa,
				WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
		else
			hostapd_sta_deauth(
				hapd, sa,
				WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
		return;
	}

	pos = (u8 *) (hdr + 1);
	left = len - sizeof(*hdr);

	if (left < sizeof(rfc1042_header)) {
		printf("Too short data frame\n");
		return;
	}

	if (memcmp(pos, rfc1042_header, sizeof(rfc1042_header)) != 0) {
		printf("Data frame with no RFC1042 header\n");
		return;
	}
	pos += sizeof(rfc1042_header);
	left -= sizeof(rfc1042_header);

	if (left < 2) {
		printf("No ethertype in data frame\n");
		return;
	}

	ethertype = WPA_GET_BE16(pos);
	pos += 2;
	left -= 2;
	switch (ethertype) {
	case ETH_P_PAE:
		ieee802_1x_receive(hapd, sa, pos, left);
		break;

	default:
		printf("Unknown ethertype 0x%04x in data frame\n", ethertype);
		break;
	}
}


static void handle_tx_callback(struct hostapd_data *hapd, u8 *buf, size_t len,
			       int ok)
{
	struct ieee80211_hdr *hdr;
	u16 fc, type, stype;
	struct sta_info *sta;

	hdr = (struct ieee80211_hdr *) buf;
	fc = le_to_host16(hdr->frame_control);

	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);

	switch (type) {
	case WLAN_FC_TYPE_MGMT:
		wpa_printf(MSG_DEBUG, "MGMT (TX callback) %s",
			   ok ? "ACK" : "fail");
		ieee802_11_mgmt_cb(hapd, buf, len, stype, ok);
		break;
	case WLAN_FC_TYPE_CTRL:
		wpa_printf(MSG_DEBUG, "CTRL (TX callback) %s",
			   ok ? "ACK" : "fail");
		break;
	case WLAN_FC_TYPE_DATA:
		wpa_printf(MSG_DEBUG, "DATA (TX callback) %s",
			   ok ? "ACK" : "fail");
		sta = ap_get_sta(hapd, hdr->addr1);
		if (sta && sta->flags & WLAN_STA_PENDING_POLL) {
			wpa_printf(MSG_DEBUG, "STA " MACSTR
				   " %s pending activity poll",
				   MAC2STR(sta->addr),
				   ok ? "ACKed" : "did not ACK");
			if (ok)
				sta->flags &= ~WLAN_STA_PENDING_POLL;
		}
		if (sta)
			ieee802_1x_tx_status(hapd, sta, buf, len, ok);
		break;
	default:
		printf("unknown TX callback frame type %d\n", type);
		break;
	}
}


static void handle_frame(struct hostapd_data *hapd, u8 *buf, size_t len)
{
	struct ieee80211_hdr *hdr;
	u16 fc, extra_len, type, stype;
	unsigned char *extra = NULL;
	size_t data_len = len;
	int ver;

	/* PSPOLL is only 16 bytes, but driver does not (at least yet) pass
	 * these to user space */
	if (len < 24) {
		wpa_printf(MSG_MSGDUMP, "handle_frame: too short (%lu)",
			   (unsigned long) len);
		return;
	}

	hdr = (struct ieee80211_hdr *) buf;
	fc = le_to_host16(hdr->frame_control);
	type = WLAN_FC_GET_TYPE(fc);
	stype = WLAN_FC_GET_STYPE(fc);

	if (type != WLAN_FC_TYPE_MGMT || stype != WLAN_FC_STYPE_BEACON) {
		wpa_hexdump(MSG_MSGDUMP, "Received management frame",
			    buf, len);
	}

	ver = fc & WLAN_FC_PVER;

	/* protocol version 3 is reserved for indicating extra data after the
	 * payload, version 2 for indicating ACKed frame (TX callbacks), and
	 * version 1 for indicating failed frame (no ACK, TX callbacks) */
	if (ver == 3) {
		u8 *pos = buf + len - 2;
		extra_len = WPA_GET_LE16(pos);
		printf("extra data in frame (elen=%d)\n", extra_len);
		if ((size_t) extra_len + 2 > len) {
			printf("  extra data overflow\n");
			return;
		}
		len -= extra_len + 2;
		extra = buf + len;
	} else if (ver == 1 || ver == 2) {
		handle_tx_callback(hapd, buf, data_len, ver == 2 ? 1 : 0);
		return;
	} else if (ver != 0) {
		printf("unknown protocol version %d\n", ver);
		return;
	}

	switch (type) {
	case WLAN_FC_TYPE_MGMT:
		if (stype != WLAN_FC_STYPE_BEACON)
			wpa_printf(MSG_MSGDUMP, "MGMT");
		ieee802_11_mgmt(hapd, buf, data_len, stype, NULL);
		break;
	case WLAN_FC_TYPE_CTRL:
		wpa_printf(MSG_DEBUG, "CTRL");
		break;
	case WLAN_FC_TYPE_DATA:
		wpa_printf(MSG_DEBUG, "DATA");
		handle_data(hapd, buf, data_len, stype);
		break;
	default:
		wpa_printf(MSG_DEBUG, "unknown frame type %d", type);
		break;
	}
}


static void handle_read(int sock, void *eloop_ctx, void *sock_ctx)
{
	struct hostapd_data *hapd = (struct hostapd_data *) eloop_ctx;
	int len;
	unsigned char buf[3000];

	len = recv(sock, buf, sizeof(buf), 0);
	if (len < 0) {
		perror("recv");
		return;
	}

	handle_frame(hapd, buf, len);
}


static int hostap_init_sockets(struct hostap_driver_data *drv)
{
	struct ifreq ifr;
	struct sockaddr_ll addr;

	drv->sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
	if (drv->sock < 0) {
		perror("socket[PF_PACKET,SOCK_RAW]");
		return -1;
	}

	if (eloop_register_read_sock(drv->sock, handle_read, drv->hapd, NULL))
	{
		printf("Could not register read socket\n");
		return -1;
	}

        memset(&ifr, 0, sizeof(ifr));
        snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%sap", drv->iface);
        if (ioctl(drv->sock, SIOCGIFINDEX, &ifr) != 0) {
		perror("ioctl(SIOCGIFINDEX)");
		return -1;
        }

	if (hostap_set_iface_flags(drv, 1)) {
		return -1;
	}

	memset(&addr, 0, sizeof(addr));
	addr.sll_family = AF_PACKET;
	addr.sll_ifindex = ifr.ifr_ifindex;
	wpa_printf(MSG_DEBUG, "Opening raw packet socket for ifindex %d",
		   addr.sll_ifindex);

	if (bind(drv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		perror("bind");
		return -1;
	}

        memset(&ifr, 0, sizeof(ifr));
        os_strlcpy(ifr.ifr_name, drv->iface, sizeof(ifr.ifr_name));
        if (ioctl(drv->sock, SIOCGIFHWADDR, &ifr) != 0) {
		perror("ioctl(SIOCGIFHWADDR)");
		return -1;
        }

	if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) {
		printf("Invalid HW-addr family 0x%04x\n",
		       ifr.ifr_hwaddr.sa_family);
		return -1;
	}
	memcpy(drv->hapd->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN);

	return 0;
}


static int hostap_send_mgmt_frame(void *priv, const void *msg, size_t len,
				  int flags)
{
	struct hostap_driver_data *drv = priv;
	
	return send(drv->sock, msg, len, flags);
}


static int hostap_send_eapol(void *priv, const u8 *addr, const u8 *data,
			     size_t data_len, int encrypt, const u8 *own_addr)
{
	struct hostap_driver_data *drv = priv;
	struct ieee80211_hdr *hdr;
	size_t len;
	u8 *pos;
	int res;

	len = sizeof(*hdr) + sizeof(rfc1042_header) + 2 + data_len;
	hdr = os_zalloc(len);
	if (hdr == NULL) {
		printf("malloc() failed for hostapd_send_data(len=%lu)\n",
		       (unsigned long) len);
		return -1;
	}

	hdr->frame_control =
		IEEE80211_FC(WLAN_FC_TYPE_DATA, WLAN_FC_STYPE_DATA);
	hdr->frame_control |= host_to_le16(WLAN_FC_FROMDS);
	/* Request TX callback */
	hdr->frame_control |= host_to_le16(BIT(1));
	if (encrypt)
		hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
	memcpy(hdr->IEEE80211_DA_FROMDS, addr, ETH_ALEN);
	memcpy(hdr->IEEE80211_BSSID_FROMDS, own_addr, ETH_ALEN);
	memcpy(hdr->IEEE80211_SA_FROMDS, own_addr, ETH_ALEN);

	pos = (u8 *) (hdr + 1);
	memcpy(pos, rfc1042_header, sizeof(rfc1042_header));
	pos += sizeof(rfc1042_header);
	*((u16 *) pos) = htons(ETH_P_PAE);
	pos += 2;
	memcpy(pos, data, data_len);

	res = hostap_send_mgmt_frame(drv, (u8 *) hdr, len, 0);
	free(hdr);

	if (res < 0) {
		perror("hostapd_send_eapol: send");
		printf("hostapd_send_eapol - packet len: %lu - failed\n",
		       (unsigned long) len);
	}

	return res;
}


static int hostap_sta_set_flags(void *priv, const u8 *addr,
				int total_flags, int flags_or, int flags_and)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_SET_FLAGS_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	param.u.set_flags_sta.flags_or = flags_or;
	param.u.set_flags_sta.flags_and = flags_and;
	return hostapd_ioctl(drv, &param, sizeof(param));
}


static int hostap_set_iface_flags(void *priv, int dev_up)
{
	struct hostap_driver_data *drv = priv;
	struct ifreq ifr;

	if (drv->ioctl_sock < 0)
		return -1;

	memset(&ifr, 0, sizeof(ifr));
	snprintf(ifr.ifr_name, IFNAMSIZ, "%sap", drv->iface);

	if (ioctl(drv->ioctl_sock, SIOCGIFFLAGS, &ifr) != 0) {
		perror("ioctl[SIOCGIFFLAGS]");
		return -1;
	}

	if (dev_up)
		ifr.ifr_flags |= IFF_UP;
	else
		ifr.ifr_flags &= ~IFF_UP;

	if (ioctl(drv->ioctl_sock, SIOCSIFFLAGS, &ifr) != 0) {
		perror("ioctl[SIOCSIFFLAGS]");
		return -1;
	}

	if (dev_up) {
		memset(&ifr, 0, sizeof(ifr));
		snprintf(ifr.ifr_name, IFNAMSIZ, "%sap", drv->iface);
		ifr.ifr_mtu = HOSTAPD_MTU;
		if (ioctl(drv->ioctl_sock, SIOCSIFMTU, &ifr) != 0) {
			perror("ioctl[SIOCSIFMTU]");
			printf("Setting MTU failed - trying to survive with "
			       "current value\n");
		}
	}

	return 0;
}


static int hostapd_ioctl(void *priv, struct prism2_hostapd_param *param,
			 int len)
{
	struct hostap_driver_data *drv = priv;
	struct iwreq iwr;

	memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	iwr.u.data.pointer = (caddr_t) param;
	iwr.u.data.length = len;

	if (ioctl(drv->ioctl_sock, PRISM2_IOCTL_HOSTAPD, &iwr) < 0) {
		perror("ioctl[PRISM2_IOCTL_HOSTAPD]");
		return -1;
	}

	return 0;
}


static int hostap_set_encryption(const char *ifname, void *priv,
				 const char *alg, const u8 *addr,
				 int idx, const u8 *key, size_t key_len,
				 int txkey)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param *param;
	u8 *buf;
	size_t blen;
	int ret = 0;

	blen = sizeof(*param) + key_len;
	buf = os_zalloc(blen);
	if (buf == NULL)
		return -1;

	param = (struct prism2_hostapd_param *) buf;
	param->cmd = PRISM2_SET_ENCRYPTION;
	if (addr == NULL)
		memset(param->sta_addr, 0xff, ETH_ALEN);
	else
		memcpy(param->sta_addr, addr, ETH_ALEN);
	os_strlcpy((char *) param->u.crypt.alg, alg,
		   HOSTAP_CRYPT_ALG_NAME_LEN);
	param->u.crypt.flags = txkey ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
	param->u.crypt.idx = idx;
	param->u.crypt.key_len = key_len;
	memcpy((u8 *) (param + 1), key, key_len);

	if (hostapd_ioctl(drv, param, blen)) {
		printf("Failed to set encryption.\n");
		ret = -1;
	}
	free(buf);

	return ret;
}


static int hostap_get_seqnum(const char *ifname, void *priv, const u8 *addr,
			     int idx, u8 *seq)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param *param;
	u8 *buf;
	size_t blen;
	int ret = 0;

	blen = sizeof(*param) + 32;
	buf = os_zalloc(blen);
	if (buf == NULL)
		return -1;

	param = (struct prism2_hostapd_param *) buf;
	param->cmd = PRISM2_GET_ENCRYPTION;
	if (addr == NULL)
		memset(param->sta_addr, 0xff, ETH_ALEN);
	else
		memcpy(param->sta_addr, addr, ETH_ALEN);
	param->u.crypt.idx = idx;

	if (hostapd_ioctl(drv, param, blen)) {
		printf("Failed to get encryption.\n");
		ret = -1;
	} else {
		memcpy(seq, param->u.crypt.seq, 8);
	}
	free(buf);

	return ret;
}


static int hostap_ioctl_prism2param(void *priv, int param, int value)
{
	struct hostap_driver_data *drv = priv;
	struct iwreq iwr;
	int *i;

	memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	i = (int *) iwr.u.name;
	*i++ = param;
	*i++ = value;

	if (ioctl(drv->ioctl_sock, PRISM2_IOCTL_PRISM2_PARAM, &iwr) < 0) {
		perror("ioctl[PRISM2_IOCTL_PRISM2_PARAM]");
		return -1;
	}

	return 0;
}


static int hostap_set_ieee8021x(const char *ifname, void *priv, int enabled)
{
	struct hostap_driver_data *drv = priv;

	/* enable kernel driver support for IEEE 802.1X */
	if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_IEEE_802_1X, enabled)) {
		printf("Could not setup IEEE 802.1X support in kernel driver."
		       "\n");
		return -1;
	}

	if (!enabled)
		return 0;

	/* use host driver implementation of encryption to allow
	 * individual keys and passing plaintext EAPOL frames */
	if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOST_DECRYPT, 1) ||
	    hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOST_ENCRYPT, 1)) {
		printf("Could not setup host-based encryption in kernel "
		       "driver.\n");
		return -1;
	}

	return 0;
}


static int hostap_set_privacy(const char *ifname, void *priv, int enabled)
{
	struct hostap_drvier_data *drv = priv;

	return hostap_ioctl_prism2param(drv, PRISM2_PARAM_PRIVACY_INVOKED,
					enabled);
}

 
static int hostap_set_ssid(const char *ifname, void *priv, const u8 *buf,
			   int len)
{
	struct hostap_driver_data *drv = priv;
	struct iwreq iwr;

	memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	iwr.u.essid.flags = 1; /* SSID active */
	iwr.u.essid.pointer = (caddr_t) buf;
	iwr.u.essid.length = len + 1;

	if (ioctl(drv->ioctl_sock, SIOCSIWESSID, &iwr) < 0) {
		perror("ioctl[SIOCSIWESSID]");
		printf("len=%d\n", len);
		return -1;
	}

	return 0;
}


static int hostap_flush(void *priv)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_FLUSH;
	return hostapd_ioctl(drv, &param, sizeof(param));
}


static int hostap_read_sta_data(void *priv,
				struct hostap_sta_driver_data *data,
				const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	char buf[1024], line[128], *pos;
	FILE *f;
	unsigned long val;

	memset(data, 0, sizeof(*data));
	snprintf(buf, sizeof(buf), "/proc/net/hostap/%s/" MACSTR,
		 drv->iface, MAC2STR(addr));

	f = fopen(buf, "r");
	if (!f)
		return -1;
	/* Need to read proc file with in one piece, so use large enough
	 * buffer. */
	setbuffer(f, buf, sizeof(buf));

	while (fgets(line, sizeof(line), f)) {
		pos = strchr(line, '=');
		if (!pos)
			continue;
		*pos++ = '\0';
		val = strtoul(pos, NULL, 10);
		if (strcmp(line, "rx_packets") == 0)
			data->rx_packets = val;
		else if (strcmp(line, "tx_packets") == 0)
			data->tx_packets = val;
		else if (strcmp(line, "rx_bytes") == 0)
			data->rx_bytes = val;
		else if (strcmp(line, "tx_bytes") == 0)
			data->tx_bytes = val;
	}

	fclose(f);

	return 0;
}


static int hostap_sta_add(const char *ifname, void *priv, const u8 *addr,
			  u16 aid, u16 capability, u8 *supp_rates,
			  size_t supp_rates_len, int flags)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;
	int tx_supp_rates = 0;
	size_t i;

#define WLAN_RATE_1M BIT(0)
#define WLAN_RATE_2M BIT(1)
#define WLAN_RATE_5M5 BIT(2)
#define WLAN_RATE_11M BIT(3)

	for (i = 0; i < supp_rates_len; i++) {
		if ((supp_rates[i] & 0x7f) == 2)
			tx_supp_rates |= WLAN_RATE_1M;
		if ((supp_rates[i] & 0x7f) == 4)
			tx_supp_rates |= WLAN_RATE_2M;
		if ((supp_rates[i] & 0x7f) == 11)
			tx_supp_rates |= WLAN_RATE_5M5;
		if ((supp_rates[i] & 0x7f) == 22)
			tx_supp_rates |= WLAN_RATE_11M;
	}

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_ADD_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	param.u.add_sta.aid = aid;
	param.u.add_sta.capability = capability;
	param.u.add_sta.tx_supp_rates = tx_supp_rates;
	return hostapd_ioctl(drv, &param, sizeof(param));
}


static int hostap_sta_remove(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	hostap_sta_set_flags(drv, addr, 0, 0, ~WLAN_STA_AUTHORIZED);

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_REMOVE_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		printf("Could not remove station from kernel driver.\n");
		return -1;
	}
	return 0;
}


static int hostap_get_inact_sec(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_GET_INFO_STA;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		return -1;
	}

	return param.u.get_info_sta.inactive_sec;
}


static int hostap_sta_clear_stats(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_STA_CLEAR_STATS;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param))) {
		return -1;
	}

	return 0;
}


static int hostap_set_assoc_ap(void *priv, const u8 *addr)
{
	struct hostap_driver_data *drv = priv;
	struct prism2_hostapd_param param;

	memset(&param, 0, sizeof(param));
	param.cmd = PRISM2_HOSTAPD_SET_ASSOC_AP_ADDR;
	memcpy(param.sta_addr, addr, ETH_ALEN);
	if (hostapd_ioctl(drv, &param, sizeof(param)))
		return -1;

	return 0;
}


static int hostapd_ioctl_set_generic_elem(struct hostap_driver_data *drv)
{
	struct prism2_hostapd_param *param;
	int res;
	size_t blen, elem_len;

	elem_len = drv->generic_ie_len;
	blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + elem_len;
	if (blen < sizeof(*param))
		blen = sizeof(*param);

	param = os_zalloc(blen);
	if (param == NULL)
		return -1;

	param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
	param->u.generic_elem.len = elem_len;
	if (drv->generic_ie) {
		os_memcpy(param->u.generic_elem.data, drv->generic_ie,
			  drv->generic_ie_len);
	}
	wpa_hexdump(MSG_DEBUG, "hostap: Set generic IE",
		    param->u.generic_elem.data, elem_len);
	res = hostapd_ioctl(drv, param, blen);

	os_free(param);

	return res;
}


static int hostap_set_generic_elem(const char *ifname, void *priv,
				   const u8 *elem, size_t elem_len)
{
	struct hostap_driver_data *drv = priv;

	os_free(drv->generic_ie);
	drv->generic_ie = NULL;
	drv->generic_ie_len = 0;
	if (elem) {
		drv->generic_ie = os_malloc(elem_len);
		if (drv->generic_ie == NULL)
			return -1;
		os_memcpy(drv->generic_ie, elem, elem_len);
		drv->generic_ie_len = elem_len;
	}

	return hostapd_ioctl_set_generic_elem(drv);
}


static void
hostapd_wireless_event_wireless_custom(struct hostap_driver_data *drv,
				       char *custom)
{
	wpa_printf(MSG_DEBUG, "Custom wireless event: '%s'", custom);

	if (strncmp(custom, "MLME-MICHAELMICFAILURE.indication", 33) == 0) {
		char *pos;
		u8 addr[ETH_ALEN];
		pos = strstr(custom, "addr=");
		if (pos == NULL) {
			wpa_printf(MSG_DEBUG,
				   "MLME-MICHAELMICFAILURE.indication "
				   "without sender address ignored");
			return;
		}
		pos += 5;
		if (hwaddr_aton(pos, addr) == 0) {
			ieee80211_michael_mic_failure(drv->hapd, addr, 1);
		} else {
			wpa_printf(MSG_DEBUG,
				   "MLME-MICHAELMICFAILURE.indication "
				   "with invalid MAC address");
		}
	}
}


static void hostapd_wireless_event_wireless(struct hostap_driver_data *drv,
					    char *data, int len)
{
	struct iw_event iwe_buf, *iwe = &iwe_buf;
	char *pos, *end, *custom, *buf;

	pos = data;
	end = data + len;

	while (pos + IW_EV_LCP_LEN <= end) {
		/* Event data may be unaligned, so make a local, aligned copy
		 * before processing. */
		memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
		wpa_printf(MSG_DEBUG, "Wireless event: cmd=0x%x len=%d",
			   iwe->cmd, iwe->len);
		if (iwe->len <= IW_EV_LCP_LEN)
			return;

		custom = pos + IW_EV_POINT_LEN;
		if (drv->we_version > 18 &&
		    (iwe->cmd == IWEVMICHAELMICFAILURE ||
		     iwe->cmd == IWEVCUSTOM)) {
			/* WE-19 removed the pointer from struct iw_point */
			char *dpos = (char *) &iwe_buf.u.data.length;
			int dlen = dpos - (char *) &iwe_buf;
			memcpy(dpos, pos + IW_EV_LCP_LEN,
			       sizeof(struct iw_event) - dlen);
		} else {
			memcpy(&iwe_buf, pos, sizeof(struct iw_event));
			custom += IW_EV_POINT_OFF;
		}

		switch (iwe->cmd) {
		case IWEVCUSTOM:
			if (custom + iwe->u.data.length > end)
				return;
			buf = malloc(iwe->u.data.length + 1);
			if (buf == NULL)
				return;
			memcpy(buf, custom, iwe->u.data.length);
			buf[iwe->u.data.length] = '\0';
			hostapd_wireless_event_wireless_custom(drv, buf);
			free(buf);
			break;
		}

		pos += iwe->len;
	}
}


static void hostapd_wireless_event_rtm_newlink(struct hostap_driver_data *drv,
					       struct nlmsghdr *h, int len)
{
	struct ifinfomsg *ifi;
	int attrlen, nlmsg_len, rta_len;
	struct rtattr * attr;

	if (len < (int) sizeof(*ifi))
		return;

	ifi = NLMSG_DATA(h);

	/* TODO: use ifi->ifi_index to filter out wireless events from other
	 * interfaces */

	nlmsg_len = NLMSG_ALIGN(sizeof(struct ifinfomsg));

	attrlen = h->nlmsg_len - nlmsg_len;
	if (attrlen < 0)
		return;

	attr = (struct rtattr *) (((char *) ifi) + nlmsg_len);

	rta_len = RTA_ALIGN(sizeof(struct rtattr));
	while (RTA_OK(attr, attrlen)) {
		if (attr->rta_type == IFLA_WIRELESS) {
			hostapd_wireless_event_wireless(
				drv, ((char *) attr) + rta_len,
				attr->rta_len - rta_len);
		}
		attr = RTA_NEXT(attr, attrlen);
	}
}


static void hostapd_wireless_event_receive(int sock, void *eloop_ctx,
					   void *sock_ctx)
{
	char buf[256];
	int left;
	struct sockaddr_nl from;
	socklen_t fromlen;
	struct nlmsghdr *h;
	struct hostap_driver_data *drv = eloop_ctx;

	fromlen = sizeof(from);
	left = recvfrom(sock, buf, sizeof(buf), MSG_DONTWAIT,
			(struct sockaddr *) &from, &fromlen);
	if (left < 0) {
		if (errno != EINTR && errno != EAGAIN)
			perror("recvfrom(netlink)");
		return;
	}

	h = (struct nlmsghdr *) buf;
	while (left >= (int) sizeof(*h)) {
		int len, plen;

		len = h->nlmsg_len;
		plen = len - sizeof(*h);
		if (len > left || plen < 0) {
			printf("Malformed netlink message: "
			       "len=%d left=%d plen=%d\n",
			       len, left, plen);
			break;
		}

		switch (h->nlmsg_type) {
		case RTM_NEWLINK:
			hostapd_wireless_event_rtm_newlink(drv, h, plen);
			break;
		}

		len = NLMSG_ALIGN(len);
		left -= len;
		h = (struct nlmsghdr *) ((char *) h + len);
	}

	if (left > 0) {
		printf("%d extra bytes in the end of netlink message\n", left);
	}
}


static int hostap_get_we_version(struct hostap_driver_data *drv)
{
	struct iw_range *range;
	struct iwreq iwr;
	int minlen;
	size_t buflen;

	drv->we_version = 0;

	/*
	 * Use larger buffer than struct iw_range in order to allow the
	 * structure to grow in the future.
	 */
	buflen = sizeof(struct iw_range) + 500;
	range = os_zalloc(buflen);
	if (range == NULL)
		return -1;

	memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->iface, IFNAMSIZ);
	iwr.u.data.pointer = (caddr_t) range;
	iwr.u.data.length = buflen;

	minlen = ((char *) &range->enc_capa) - (char *) range +
		sizeof(range->enc_capa);

	if (ioctl(drv->ioctl_sock, SIOCGIWRANGE, &iwr) < 0) {
		perror("ioctl[SIOCGIWRANGE]");
		free(range);
		return -1;
	} else if (iwr.u.data.length >= minlen &&
		   range->we_version_compiled >= 18) {
		wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: WE(compiled)=%d "
			   "WE(source)=%d enc_capa=0x%x",
			   range->we_version_compiled,
			   range->we_version_source,
			   range->enc_capa);
		drv->we_version = range->we_version_compiled;
	}

	free(range);
	return 0;
}


static int hostap_wireless_event_init(void *priv)
{
	struct hostap_driver_data *drv = priv;
	int s;
	struct sockaddr_nl local;

	hostap_get_we_version(drv);

	drv->wext_sock = -1;

	s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
	if (s < 0) {
		perror("socket(PF_NETLINK,SOCK_RAW,NETLINK_ROUTE)");
		return -1;
	}

	memset(&local, 0, sizeof(local));
	local.nl_family = AF_NETLINK;
	local.nl_groups = RTMGRP_LINK;
	if (bind(s, (struct sockaddr *) &local, sizeof(local)) < 0) {
		perror("bind(netlink)");
		close(s);
		return -1;
	}

	eloop_register_read_sock(s, hostapd_wireless_event_receive, drv,
				 NULL);
	drv->wext_sock = s;

	return 0;
}


static void hostap_wireless_event_deinit(void *priv)
{
	struct hostap_driver_data *drv = priv;
	if (drv->wext_sock < 0)
		return;
	eloop_unregister_read_sock(drv->wext_sock);
	close(drv->wext_sock);
}


static void * hostap_init(struct hostapd_data *hapd)
{
	struct hostap_driver_data *drv;

	drv = os_zalloc(sizeof(struct hostap_driver_data));
	if (drv == NULL) {
		printf("Could not allocate memory for hostapd driver data\n");
		return NULL;
	}

	drv->hapd = hapd;
	drv->ioctl_sock = drv->sock = -1;
	memcpy(drv->iface, hapd->conf->iface, sizeof(drv->iface));

	drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
	if (drv->ioctl_sock < 0) {
		perror("socket[PF_INET,SOCK_DGRAM]");
		free(drv);
		return NULL;
	}

	if (hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 1)) {
		printf("Could not enable hostapd mode for interface %s\n",
		       drv->iface);
		close(drv->ioctl_sock);
		free(drv);
		return NULL;
	}

	if (hapd->conf->assoc_ap &&
	    hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 1)) {
		printf("Could not enable hostapd STA mode for interface %s\n",
		       drv->iface);
		close(drv->ioctl_sock);
		free(drv);
		return NULL;
	}

	if (hostap_init_sockets(drv)) {
		close(drv->ioctl_sock);
		free(drv);
		return NULL;
	}

	return drv;
}


static void hostap_driver_deinit(void *priv)
{
	struct hostap_driver_data *drv = priv;

	(void) hostap_set_iface_flags(drv, 0);
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD, 0);
	(void) hostap_ioctl_prism2param(drv, PRISM2_PARAM_HOSTAPD_STA, 0);

	if (drv->ioctl_sock >= 0)
		close(drv->ioctl_sock);

	if (drv->sock >= 0)
		close(drv->sock);

	os_free(drv->generic_ie);

	free(drv);
}


static int hostap_sta_deauth(void *priv, const u8 *addr, int reason)
{
	struct hostap_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DEAUTH);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.deauth.reason_code = host_to_le16(reason);
	return hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				      sizeof(mgmt.u.deauth), 0);
}


static int hostap_sta_disassoc(void *priv, const u8 *addr, int reason)
{
	struct hostap_driver_data *drv = priv;
	struct ieee80211_mgmt mgmt;

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_DISASSOC);
	memcpy(mgmt.da, addr, ETH_ALEN);
	memcpy(mgmt.sa, drv->hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, drv->hapd->own_addr, ETH_ALEN);
	mgmt.u.disassoc.reason_code = host_to_le16(reason);
	return  hostap_send_mgmt_frame(drv, &mgmt, IEEE80211_HDRLEN +
				       sizeof(mgmt.u.disassoc), 0);
}


static struct hostapd_hw_modes * hostap_get_hw_feature_data(void *priv,
							    u16 *num_modes,
							    u16 *flags)
{
	struct hostapd_hw_modes *mode;
	int i, clen, rlen;
	const short chan2freq[14] = {
		2412, 2417, 2422, 2427, 2432, 2437, 2442,
		2447, 2452, 2457, 2462, 2467, 2472, 2484
	};

	mode = os_zalloc(sizeof(struct hostapd_hw_modes));
	if (mode == NULL)
		return NULL;

	*num_modes = 1;
	*flags = 0;

	mode->mode = HOSTAPD_MODE_IEEE80211B;
	mode->num_channels = 14;
	mode->num_rates = 4;

	clen = mode->num_channels * sizeof(struct hostapd_channel_data);
	rlen = mode->num_rates * sizeof(struct hostapd_rate_data);

	mode->channels = os_zalloc(clen);
	mode->rates = os_zalloc(rlen);
	if (mode->channels == NULL || mode->rates == NULL) {
		hostapd_free_hw_features(mode, *num_modes);
		return NULL;
	}

	for (i = 0; i < 14; i++) {
		mode->channels[i].chan = i + 1;
		mode->channels[i].freq = chan2freq[i];
	}

	mode->rates[0].rate = 10;
	mode->rates[0].flags = HOSTAPD_RATE_CCK;
	mode->rates[1].rate = 20;
	mode->rates[1].flags = HOSTAPD_RATE_CCK;
	mode->rates[2].rate = 55;
	mode->rates[2].flags = HOSTAPD_RATE_CCK;
	mode->rates[3].rate = 110;
	mode->rates[3].flags = HOSTAPD_RATE_CCK;

	return mode;
}


const struct wpa_driver_ops wpa_driver_hostap_ops = {
	.name = "hostap",
	.init = hostap_init,
	.deinit = hostap_driver_deinit,
	.wireless_event_init = hostap_wireless_event_init,
	.wireless_event_deinit = hostap_wireless_event_deinit,
	.set_ieee8021x = hostap_set_ieee8021x,
	.set_privacy = hostap_set_privacy,
	.set_encryption = hostap_set_encryption,
	.get_seqnum = hostap_get_seqnum,
	.flush = hostap_flush,
	.set_generic_elem = hostap_set_generic_elem,
	.read_sta_data = hostap_read_sta_data,
	.send_eapol = hostap_send_eapol,
	.sta_set_flags = hostap_sta_set_flags,
	.sta_deauth = hostap_sta_deauth,
	.sta_disassoc = hostap_sta_disassoc,
	.sta_remove = hostap_sta_remove,
	.set_ssid = hostap_set_ssid,
	.send_mgmt_frame = hostap_send_mgmt_frame,
	.set_assoc_ap = hostap_set_assoc_ap,
	.sta_add = hostap_sta_add,
	.get_inact_sec = hostap_get_inact_sec,
	.sta_clear_stats = hostap_sta_clear_stats,
	.get_hw_feature_data = hostap_get_hw_feature_data,
};