driver_wext.c

IEEE802.11 a/b/g 客户端应用程序源代码

}


static int wext_19_iw_point(struct wpa_driver_wext_data *drv, u16 cmd)
{
	return drv->we_version_compiled > 18 &&
		(cmd == SIOCGIWESSID || cmd == SIOCGIWENCODE ||
		 cmd == IWEVGENIE || cmd == IWEVCUSTOM);
}


static void wpa_driver_wext_add_scan_entry(struct wpa_scan_results *res,
					   struct wext_scan_data *data)
{
	struct wpa_scan_res **tmp;
	struct wpa_scan_res *r;
	size_t extra_len;
	u8 *pos, *end, *ssid_ie = NULL, *rate_ie = NULL;

	/* Figure out whether we need to fake any IEs */
	pos = data->ie;
	end = pos + data->ie_len;
	while (pos && pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == WLAN_EID_SSID)
			ssid_ie = pos;
		else if (pos[0] == WLAN_EID_SUPP_RATES)
			rate_ie = pos;
		else if (pos[0] == WLAN_EID_EXT_SUPP_RATES)
			rate_ie = pos;
		pos += 2 + pos[1];
	}

	extra_len = 0;
	if (ssid_ie == NULL)
		extra_len += 2 + data->ssid_len;
	if (rate_ie == NULL && data->maxrate)
		extra_len += 3;

	r = os_zalloc(sizeof(*r) + extra_len + data->ie_len);
	if (r == NULL)
		return;
	os_memcpy(r, &data->res, sizeof(*r));
	r->ie_len = extra_len + data->ie_len;
	pos = (u8 *) (r + 1);
	if (ssid_ie == NULL) {
		/*
		 * Generate a fake SSID IE since the driver did not report
		 * a full IE list.
		 */
		*pos++ = WLAN_EID_SSID;
		*pos++ = data->ssid_len;
		os_memcpy(pos, data->ssid, data->ssid_len);
		pos += data->ssid_len;
	}
	if (rate_ie == NULL && data->maxrate) {
		/*
		 * Generate a fake Supported Rates IE since the driver did not
		 * report a full IE list.
		 */
		*pos++ = WLAN_EID_SUPP_RATES;
		*pos++ = 1;
		*pos++ = data->maxrate;
	}
	if (data->ie)
		os_memcpy(pos, data->ie, data->ie_len);

	tmp = os_realloc(res->res,
			 (res->num + 1) * sizeof(struct wpa_scan_res *));
	if (tmp == NULL) {
		os_free(r);
		return;
	}
	tmp[res->num++] = r;
	res->res = tmp;
}
				      

/**
 * wpa_driver_wext_get_scan_results - Fetch the latest scan results
 * @priv: Pointer to private wext data from wpa_driver_wext_init()
 * Returns: Scan results on success, -1 on failure
 */
struct wpa_scan_results * wpa_driver_wext_get_scan_results(void *priv)
{
	struct wpa_driver_wext_data *drv = priv;
	size_t ap_num = 0, len;
	int first;
	u8 *res_buf;
	struct iw_event iwe_buf, *iwe = &iwe_buf;
	char *pos, *end, *custom;
	struct wpa_scan_results *res;
	struct wext_scan_data data;

	res_buf = wpa_driver_wext_giwscan(drv, &len);
	if (res_buf == NULL)
		return NULL;

	ap_num = 0;
	first = 1;

	res = os_zalloc(sizeof(*res));
	if (res == NULL) {
		os_free(res_buf);
		return NULL;
	}

	pos = (char *) res_buf;
	end = (char *) res_buf + len;
	os_memset(&data, 0, sizeof(data));

	while (pos + IW_EV_LCP_LEN <= end) {
		/* Event data may be unaligned, so make a local, aligned copy
		 * before processing. */
		os_memcpy(&iwe_buf, pos, IW_EV_LCP_LEN);
		if (iwe->len <= IW_EV_LCP_LEN)
			break;

		custom = pos + IW_EV_POINT_LEN;
		if (wext_19_iw_point(drv, iwe->cmd)) {
			/* WE-19 removed the pointer from struct iw_point */
			char *dpos = (char *) &iwe_buf.u.data.length;
			int dlen = dpos - (char *) &iwe_buf;
			os_memcpy(dpos, pos + IW_EV_LCP_LEN,
				  sizeof(struct iw_event) - dlen);
		} else {
			os_memcpy(&iwe_buf, pos, sizeof(struct iw_event));
			custom += IW_EV_POINT_OFF;
		}

		switch (iwe->cmd) {
		case SIOCGIWAP:
			if (!first)
				wpa_driver_wext_add_scan_entry(res, &data);
			first = 0;
			os_free(data.ie);
			os_memset(&data, 0, sizeof(data));
			os_memcpy(data.res.bssid,
				  iwe->u.ap_addr.sa_data, ETH_ALEN);
			break;
		case SIOCGIWMODE:
			wext_get_scan_mode(iwe, &data);
			break;
		case SIOCGIWESSID:
			wext_get_scan_ssid(iwe, &data, custom, end);
			break;
		case SIOCGIWFREQ:
			wext_get_scan_freq(iwe, &data);
			break;
		case IWEVQUAL:
			wext_get_scan_qual(iwe, &data);
			break;
		case SIOCGIWENCODE:
			wext_get_scan_encode(iwe, &data);
			break;
		case SIOCGIWRATE:
			wext_get_scan_rate(iwe, &data, pos, end);
			break;
		case IWEVGENIE:
			wext_get_scan_iwevgenie(iwe, &data, custom, end);
			break;
		case IWEVCUSTOM:
			wext_get_scan_custom(iwe, &data, custom, end);
			break;
		}

		pos += iwe->len;
	}
	os_free(res_buf);
	res_buf = NULL;
	if (!first)
		wpa_driver_wext_add_scan_entry(res, &data);
	os_free(data.ie);

	wpa_printf(MSG_DEBUG, "Received %lu bytes of scan results (%lu BSSes)",
		   (unsigned long) len, (unsigned long) res->num);

	return res;
}


static int wpa_driver_wext_get_range(void *priv)
{
	struct wpa_driver_wext_data *drv = priv;
	struct iw_range *range;
	struct iwreq iwr;
	int minlen;
	size_t buflen;

	/*
	 * 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;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, 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]");
		os_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->has_capability = 1;
		drv->we_version_compiled = range->we_version_compiled;
		if (range->enc_capa & IW_ENC_CAPA_WPA) {
			drv->capa.key_mgmt |= WPA_DRIVER_CAPA_KEY_MGMT_WPA |
				WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK;
		}
		if (range->enc_capa & IW_ENC_CAPA_WPA2) {
			drv->capa.key_mgmt |= WPA_DRIVER_CAPA_KEY_MGMT_WPA2 |
				WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK;
		}
		drv->capa.enc |= WPA_DRIVER_CAPA_ENC_WEP40 |
			WPA_DRIVER_CAPA_ENC_WEP104;
		if (range->enc_capa & IW_ENC_CAPA_CIPHER_TKIP)
			drv->capa.enc |= WPA_DRIVER_CAPA_ENC_TKIP;
		if (range->enc_capa & IW_ENC_CAPA_CIPHER_CCMP)
			drv->capa.enc |= WPA_DRIVER_CAPA_ENC_CCMP;
		if (range->enc_capa & IW_ENC_CAPA_4WAY_HANDSHAKE)
			drv->capa.flags |= WPA_DRIVER_FLAGS_4WAY_HANDSHAKE;

		wpa_printf(MSG_DEBUG, "  capabilities: key_mgmt 0x%x enc 0x%x "
			   "flags 0x%x",
			   drv->capa.key_mgmt, drv->capa.enc, drv->capa.flags);
	} else {
		wpa_printf(MSG_DEBUG, "SIOCGIWRANGE: too old (short) data - "
			   "assuming WPA is not supported");
	}

	os_free(range);
	return 0;
}


static int wpa_driver_wext_set_wpa(void *priv, int enabled)
{
	struct wpa_driver_wext_data *drv = priv;
	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);

	return wpa_driver_wext_set_auth_param(drv, IW_AUTH_WPA_ENABLED,
					      enabled);
}


static int wpa_driver_wext_set_psk(struct wpa_driver_wext_data *drv,
				   const u8 *psk)
{
	struct iw_encode_ext *ext;
	struct iwreq iwr;
	int ret;

	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);

	if (!(drv->capa.flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE))
		return 0;

	if (!psk)
		return 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);

	ext = os_zalloc(sizeof(*ext) + PMK_LEN);
	if (ext == NULL)
		return -1;

	iwr.u.encoding.pointer = (caddr_t) ext;
	iwr.u.encoding.length = sizeof(*ext) + PMK_LEN;
	ext->key_len = PMK_LEN;
	os_memcpy(&ext->key, psk, ext->key_len);
	ext->alg = IW_ENCODE_ALG_PMK;

	ret = ioctl(drv->ioctl_sock, SIOCSIWENCODEEXT, &iwr);
	if (ret < 0)
		perror("ioctl[SIOCSIWENCODEEXT] PMK");
	os_free(ext);

	return ret;
}


static int wpa_driver_wext_set_key_ext(void *priv, wpa_alg alg,
				       const u8 *addr, int key_idx,
				       int set_tx, const u8 *seq,
				       size_t seq_len,
				       const u8 *key, size_t key_len)
{
	struct wpa_driver_wext_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;
	struct iw_encode_ext *ext;

	if (seq_len > IW_ENCODE_SEQ_MAX_SIZE) {
		wpa_printf(MSG_DEBUG, "%s: Invalid seq_len %lu",
			   __FUNCTION__, (unsigned long) seq_len);
		return -1;
	}

	ext = os_zalloc(sizeof(*ext) + key_len);
	if (ext == NULL)
		return -1;
	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.encoding.flags = key_idx + 1;
	if (alg == WPA_ALG_NONE)
		iwr.u.encoding.flags |= IW_ENCODE_DISABLED;
	iwr.u.encoding.pointer = (caddr_t) ext;
	iwr.u.encoding.length = sizeof(*ext) + key_len;

	if (addr == NULL ||
	    os_memcmp(addr, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) == 0)
		ext->ext_flags |= IW_ENCODE_EXT_GROUP_KEY;
	if (set_tx)
		ext->ext_flags |= IW_ENCODE_EXT_SET_TX_KEY;

	ext->addr.sa_family = ARPHRD_ETHER;
	if (addr)
		os_memcpy(ext->addr.sa_data, addr, ETH_ALEN);
	else
		os_memset(ext->addr.sa_data, 0xff, ETH_ALEN);
	if (key && key_len) {
		os_memcpy(ext + 1, key, key_len);
		ext->key_len = key_len;
	}
	switch (alg) {
	case WPA_ALG_NONE:
		ext->alg = IW_ENCODE_ALG_NONE;
		break;
	case WPA_ALG_WEP:
		ext->alg = IW_ENCODE_ALG_WEP;
		break;
	case WPA_ALG_TKIP:
		ext->alg = IW_ENCODE_ALG_TKIP;
		break;
	case WPA_ALG_CCMP:
		ext->alg = IW_ENCODE_ALG_CCMP;
		break;
	case WPA_ALG_PMK:
		ext->alg = IW_ENCODE_ALG_PMK;
		break;
#ifdef WEXT_MFP_PENDING
#ifdef CONFIG_IEEE80211W
	case WPA_ALG_IGTK:
		ext->alg = IW_ENCODE_ALG_AES_CMAC;
		break;
#endif /* CONFIG_IEEE80211W */
#endif /* WEXT_MFP_PENDING */
	default:
		wpa_printf(MSG_DEBUG, "%s: Unknown algorithm %d",
			   __FUNCTION__, alg);
		os_free(ext);
		return -1;
	}

	if (seq && seq_len) {
		ext->ext_flags |= IW_ENCODE_EXT_RX_SEQ_VALID;
		os_memcpy(ext->rx_seq, seq, seq_len);
	}

	if (ioctl(drv->ioctl_sock, SIOCSIWENCODEEXT, &iwr) < 0) {
		ret = errno == EOPNOTSUPP ? -2 : -1;
		if (errno == ENODEV) {
			/*
			 * ndiswrapper seems to be returning incorrect error
			 * code.. */
			ret = -2;
		}

		perror("ioctl[SIOCSIWENCODEEXT]");
	}

	os_free(ext);
	return ret;
}


/**
 * wpa_driver_wext_set_key - Configure encryption key
 * @priv: Pointer to private wext data from wpa_driver_wext_init()
 * @priv: Private driver interface data
 * @alg: Encryption algorithm (%WPA_ALG_NONE, %WPA_ALG_WEP,
 *	%WPA_ALG_TKIP, %WPA_ALG_CCMP); %WPA_ALG_NONE clears the key.
 * @addr: Address of the peer STA or ff:ff:ff:ff:ff:ff for
 *	broadcast/default keys
 * @key_idx: key index (0..3), usually 0 for unicast keys
 * @set_tx: Configure this key as the default Tx key (only used when
 *	driver does not support separate unicast/individual key
 * @seq: Sequence number/packet number, seq_len octets, the next
 *	packet number to be used for in replay protection; configured
 *	for Rx keys (in most cases, this is only used with broadcast
 *	keys and set to zero for unicast keys)
 * @seq_len: Length of the seq, depends on the algorithm:
 *	TKIP: 6 octets, CCMP: 6 octets
 * @key: Key buffer; TKIP: 16-byte temporal key, 8-byte Tx Mic key,
 *	8-byte Rx Mic Key
 * @key_len: Length of the key buffer in octets (WEP: 5 or 13,
 *	TKIP: 32, CCMP: 16)
 * Returns: 0 on success, -1 on failure
 *
 * This function uses SIOCSIWENCODEEXT by default, but tries to use
 * SIOCSIWENCODE if the extended ioctl fails when configuring a WEP key.
 */
int wpa_driver_wext_set_key(void *priv, wpa_alg alg,
			    const u8 *addr, int key_idx,
			    int set_tx, const u8 *seq, size_t seq_len,
			    const u8 *key, size_t key_len)
{
	struct wpa_driver_wext_data *drv = priv;
	struct iwreq iwr;
	int ret = 0;

	wpa_printf(MSG_DEBUG, "%s: alg=%d key_idx=%d set_tx=%d seq_len=%lu "
		   "key_len=%lu",
		   __FUNCTION__, alg, key_idx, set_tx,
		   (unsigned long) seq_len, (unsigned long) key_len);

	ret = wpa_driver_wext_set_key_ext(drv, alg, addr, key_idx, set_tx,
					  seq, seq_len, key, key_len);
	if (ret == 0)
		return 0;

	if (ret == -2 &&
	    (alg == WPA_ALG_NONE || alg == WPA_ALG_WEP)) {
		wpa_printf(MSG_DEBUG, "Driver did not support "
			   "SIOCSIWENCODEEXT, trying SIOCSIWENCODE");
		ret = 0;
	} else {
		wpa_printf(MSG_DEBUG, "Driver did not support "
			   "SIOCSIWENCODEEXT");
		return ret;
	}

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.encoding.flags = key_idx + 1;
	if (alg == WPA_ALG_NONE)
		iwr.u.encoding.flags |= IW_ENCODE_DISABLED;
	iwr.u.encoding.pointer = (caddr_t) key;
	iwr.u.encoding.length = key_len;

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

	if (set_tx && alg != WPA_ALG_NONE) {
		os_memset(&iwr, 0, sizeof(iwr));
		os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
		iwr.u.encoding.flags = key_idx + 1;
		iwr.u.encoding.pointer = (caddr_t) NULL;
		iwr.u.encoding.length = 0;
		if (ioctl(drv->ioctl_sock, SIOCSIWENCODE, &iwr) < 0) {
			perror("ioctl[SIOCSIWENCODE] (set_tx)");
			ret = -1;
		}
	}

	return ret;
}


static int wpa_driver_wext_set_countermeasures(void *priv,
					       int enabled)
{
	struct wpa_driver_wext_data *drv = priv;
	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
	return wpa_driver_wext_set_auth_param(drv,
					      IW_AUTH_TKIP_COUNTERMEASURES,
					      enabled);
}


static int wpa_driver_wext_set_drop_unencrypted(void *priv,
						int enabled)
{
	struct wpa_driver_wext_data *drv = priv;
	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);
	drv->use_crypt = enabled;
	return wpa_driver_wext_set_auth_param(drv, IW_AUTH_DROP_UNENCRYPTED,
					      enabled);
}


static int wpa_driver_wext_mlme(struct wpa_driver_wext_data *drv,
				const u8 *addr, int cmd, int reason_code)
{
	struct iwreq iwr;
	struct iw_mlme mlme;
	int ret = 0;