driver_bsd.c

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/*
 * Host AP - driver interaction with BSD net80211 layer
 * Copyright (c) 2004, Sam Leffler <[e-mail]>
 * Copyright (c) 2004, 2Wire, Inc
 *
 * 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 <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <errno.h>

#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>

#include <net80211/ieee80211.h>
#include <net80211/ieee80211_crypto.h>
#include <net80211/ieee80211_ioctl.h>

#include "hostapd.h"
#include "driver.h"
#include "ieee802_1x.h"
#include "eloop.h"
#include "sta_info.h"
#include "l2_packet.h"

#include "eapol_sm.h"
#include "wpa.h"
#include "radius.h"
#include "ieee802_11.h"
#include "common.h"

struct bsd_driver_data {
	struct driver_ops ops;			/* base class */
	struct hostapd_data *hapd;		/* back pointer */

	char	iface[IFNAMSIZ + 1];
	struct l2_packet_data *sock_xmit;	/* raw packet xmit socket */
	int	ioctl_sock;			/* socket for ioctl() use */
	int	wext_sock;			/* socket for wireless events */
};

static const struct driver_ops bsd_driver_ops;

static int bsd_sta_deauth(void *priv, u8 *addr, int reason_code);

static int
set80211var(struct bsd_driver_data *drv, int op, const void *arg, int arg_len)
{
	struct ieee80211req ireq;

	memset(&ireq, 0, sizeof(ireq));
	strncpy(ireq.i_name, drv->iface, IFNAMSIZ);
	ireq.i_type = op;
	ireq.i_len = arg_len;
	ireq.i_data = (void *) arg;

	if (ioctl(drv->ioctl_sock, SIOCS80211, &ireq) < 0) {
		perror("ioctl[SIOCS80211]");
		return -1;
	}
	return 0;
}

static int
get80211var(struct bsd_driver_data *drv, int op, void *arg, int arg_len)
{
	struct ieee80211req ireq;

	memset(&ireq, 0, sizeof(ireq));
	strncpy(ireq.i_name, drv->iface, IFNAMSIZ);
	ireq.i_type = op;
	ireq.i_len = arg_len;
	ireq.i_data = arg;

	if (ioctl(drv->ioctl_sock, SIOCG80211, &ireq) < 0) {
		perror("ioctl[SIOCG80211]");
		return -1;
	}
	return ireq.i_len;
}

static int
set80211param(struct bsd_driver_data *drv, int op, int arg)
{
	struct ieee80211req ireq;

	memset(&ireq, 0, sizeof(ireq));
	strncpy(ireq.i_name, drv->iface, IFNAMSIZ);
	ireq.i_type = op;
	ireq.i_val = arg;

	if (ioctl(drv->ioctl_sock, SIOCS80211, &ireq) < 0) {
		perror("ioctl[SIOCS80211]");
		return -1;
	}
	return 0;
}

static const char *
ether_sprintf(const u8 *addr)
{
	static char buf[sizeof(MACSTR)];

	if (addr != NULL)
		snprintf(buf, sizeof(buf), MACSTR, MAC2STR(addr));
	else
		snprintf(buf, sizeof(buf), MACSTR, 0,0,0,0,0,0);
	return buf;
}

/*
 * Configure WPA parameters.
 */
static int
bsd_configure_wpa(struct bsd_driver_data *drv)
{
	static const char *ciphernames[] =
		{ "WEP", "TKIP", "AES-OCB", "AES-CCM", "CKIP", "NONE" };
	hostapd *hapd = drv->hapd;
	struct hostapd_config *conf = hapd->conf;
	int v;

	switch (conf->wpa_group) {
	case WPA_CIPHER_CCMP:
		v = IEEE80211_CIPHER_AES_CCM;
		break;
	case WPA_CIPHER_TKIP:
		v = IEEE80211_CIPHER_TKIP;
		break;
	case WPA_CIPHER_WEP104:
		v = IEEE80211_CIPHER_WEP;
		break;
	case WPA_CIPHER_WEP40:
		v = IEEE80211_CIPHER_WEP;
		break;
	case WPA_CIPHER_NONE:
		v = IEEE80211_CIPHER_NONE;
		break;
	default:
		printf("Unknown group key cipher %u\n",
			conf->wpa_group);
		return -1;
	}
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: group key cipher=%s (%u)\n", __func__, ciphernames[v], v);
	if (set80211param(drv, IEEE80211_IOC_MCASTCIPHER, v)) {
		printf("Unable to set group key cipher to %u (%s)\n",
			v, ciphernames[v]);
		return -1;
	}
	if (v == IEEE80211_CIPHER_WEP) {
		/* key length is done only for specific ciphers */
		v = (conf->wpa_group == WPA_CIPHER_WEP104 ? 13 : 5);
		if (set80211param(drv, IEEE80211_IOC_MCASTKEYLEN, v)) {
			printf("Unable to set group key length to %u\n", v);
			return -1;
		}
	}

	v = 0;
	if (conf->wpa_pairwise & WPA_CIPHER_CCMP)
		v |= 1<<IEEE80211_CIPHER_AES_CCM;
	if (conf->wpa_pairwise & WPA_CIPHER_TKIP)
		v |= 1<<IEEE80211_CIPHER_TKIP;
	if (conf->wpa_pairwise & WPA_CIPHER_NONE)
		v |= 1<<IEEE80211_CIPHER_NONE;
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: pairwise key ciphers=0x%x\n", __func__, v);
	if (set80211param(drv, IEEE80211_IOC_UCASTCIPHERS, v)) {
		printf("Unable to set pairwise key ciphers to 0x%x\n", v);
		return -1;
	}

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: key management algorithms=0x%x\n",
		__func__, conf->wpa_key_mgmt);
	if (set80211param(drv, IEEE80211_IOC_KEYMGTALGS, conf->wpa_key_mgmt)) {
		printf("Unable to set key management algorithms to 0x%x\n",
			conf->wpa_key_mgmt);
		return -1;
	}

	v = 0;
	if (conf->rsn_preauth)
		v |= BIT(0);
	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: rsn capabilities=0x%x\n", __func__, conf->rsn_preauth);
	if (set80211param(drv, IEEE80211_IOC_RSNCAPS, v)) {
		printf("Unable to set RSN capabilities to 0x%x\n", v);
		return -1;
	}

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: enable WPA= 0x%x\n", __func__, conf->wpa);
	if (set80211param(drv, IEEE80211_IOC_WPA, conf->wpa)) {
		printf("Unable to set WPA to %u\n", conf->wpa);
		return -1;
	}
	return 0;
}


static int
bsd_set_iface_flags(void *priv, int dev_up)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct ifreq ifr;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE,
		"%s: dev_up=%d\n", __func__, dev_up);

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

	memset(&ifr, 0, sizeof(ifr));
	snprintf(ifr.ifr_name, IFNAMSIZ, "%s", 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, "%s", 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
bsd_set_ieee8021x(void *priv, int enabled)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct hostapd_config *conf = hapd->conf;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE,
		"%s: enabled=%d\n", __func__, enabled);

	if (!enabled) {
		/* XXX restore state */
		return set80211param(priv, IEEE80211_IOC_AUTHMODE,
			IEEE80211_AUTH_AUTO);
	}
	if (!conf->wpa && !conf->ieee802_1x) {
		hostapd_logger(hapd, NULL, HOSTAPD_MODULE_DRIVER,
			HOSTAPD_LEVEL_WARNING, "No 802.1X or WPA enabled!");
		return -1;
	}
	if (conf->wpa && bsd_configure_wpa(drv) != 0) {
		hostapd_logger(hapd, NULL, HOSTAPD_MODULE_DRIVER,
			HOSTAPD_LEVEL_WARNING, "Error configuring WPA state!");
		return -1;
	}
	if (set80211param(priv, IEEE80211_IOC_AUTHMODE,
		(conf->wpa ?  IEEE80211_AUTH_WPA : IEEE80211_AUTH_8021X))) {
		hostapd_logger(hapd, NULL, HOSTAPD_MODULE_DRIVER,
			HOSTAPD_LEVEL_WARNING, "Error enabling WPA/802.1X!");
		return -1;
	}
	return bsd_set_iface_flags(priv, 1);
}

static int
bsd_set_privacy(void *priv, int enabled)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: enabled=%d\n", __func__, enabled);

	return set80211param(priv, IEEE80211_IOC_PRIVACY, enabled);
}

static int
bsd_set_sta_authorized(void *priv, u8 *addr, int authorized)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct ieee80211req_mlme mlme;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_VERBOSE,
		"%s: addr=%s authorized=%d\n",
		__func__, ether_sprintf(addr), authorized);

	if (authorized)
		mlme.im_op = IEEE80211_MLME_AUTHORIZE;
	else
		mlme.im_op = IEEE80211_MLME_UNAUTHORIZE;
	mlme.im_reason = 0;
	memcpy(mlme.im_macaddr, addr, IEEE80211_ADDR_LEN);
	return set80211var(priv, IEEE80211_IOC_MLME, &mlme, sizeof(mlme));
}

static int
bsd_del_key(void *priv, unsigned char *addr, int key_idx)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct ieee80211req_del_key wk;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: addr=%s key_idx=%d\n",
		__func__, ether_sprintf(addr), key_idx);

	memset(&wk, 0, sizeof(wk));
	if (addr != NULL) {
		memcpy(wk.idk_macaddr, addr, IEEE80211_ADDR_LEN);
		wk.idk_keyix = (u_int8_t) IEEE80211_KEYIX_NONE;	/* XXX */
	} else {
		wk.idk_keyix = key_idx;
	}

	return set80211var(priv, IEEE80211_IOC_DELKEY, &wk, sizeof(wk));
}

static int
bsd_set_key(void *priv, const char *alg,
	     unsigned char *addr, int key_idx,
	     u8 *key, size_t key_len)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct ieee80211req_key wk;
	u_int8_t cipher;

	if (strcmp(alg, "none") == 0)
		return bsd_del_key(priv, addr, key_idx);

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: alg=%s addr=%s key_idx=%d\n",
		__func__, alg, ether_sprintf(addr), key_idx);

	if (strcmp(alg, "WEP") == 0)
		cipher = IEEE80211_CIPHER_WEP;
	else if (strcmp(alg, "TKIP") == 0)
		cipher = IEEE80211_CIPHER_TKIP;
	else if (strcmp(alg, "CCMP") == 0)
		cipher = IEEE80211_CIPHER_AES_CCM;
	else {
		printf("%s: unknown/unsupported algorithm %s\n",
			__func__, alg);
		return -1;
	}

	if (key_len > sizeof(wk.ik_keydata)) {
		printf("%s: key length %d too big\n", __func__, key_len);
		return -3;
	}

	memset(&wk, 0, sizeof(wk));
	wk.ik_type = cipher;
	wk.ik_flags = IEEE80211_KEY_RECV | IEEE80211_KEY_XMIT;
	if (addr == NULL) {
		memset(wk.ik_macaddr, 0xff, IEEE80211_ADDR_LEN);
		wk.ik_keyix = key_idx;
		wk.ik_flags |= IEEE80211_KEY_DEFAULT;
	} else {
		memcpy(wk.ik_macaddr, addr, IEEE80211_ADDR_LEN);
		wk.ik_keyix = IEEE80211_KEYIX_NONE;
	}
	wk.ik_keylen = key_len;
	memcpy(wk.ik_keydata, key, key_len);

	return set80211var(priv, IEEE80211_IOC_WPAKEY, &wk, sizeof(wk));
}


static int
bsd_get_seqnum(void *priv, u8 *addr, int idx, u8 *seq)
{
	struct bsd_driver_data *drv = priv;
	hostapd *hapd = drv->hapd;
	struct ieee80211req_key wk;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		"%s: addr=%s idx=%d\n", __func__, ether_sprintf(addr), idx);

	memset(&wk, 0, sizeof(wk));
	if (addr == NULL)
		memset(wk.ik_macaddr, 0xff, IEEE80211_ADDR_LEN);
	else
		memcpy(wk.ik_macaddr, addr, IEEE80211_ADDR_LEN);
	wk.ik_keyix = idx;

	if (get80211var(drv, IEEE80211_IOC_WPAKEY, &wk, sizeof(wk)) < 0) {
		printf("Failed to get encryption.\n");
		return -1;
	}

#ifdef WORDS_BIGENDIAN
	{
		/*
		 * wk.ik_keytsc is in host byte order (big endian), need to
		 * swap it to match with the byte order used in WPA.
		 */
		int i;
		u8 tmp[WPA_KEY_RSC_LEN];
		memcpy(tmp, &wk.ik_keytsc, sizeof(wk.ik_keytsc));
		for (i = 0; i < WPA_KEY_RSC_LEN; i++) {
			seq[i] = tmp[WPA_KEY_RSC_LEN - i - 1];
		}
	}
#else /* WORDS_BIGENDIAN */
	memcpy(seq, &wk.ik_keytsc, sizeof(wk.ik_keytsc));
#endif /* WORDS_BIGENDIAN */
	return 0;