Linux Wi-Fi 编程API介绍

本文为《深入理解Android Wi-Fi、NFC和GPS卷》读书笔记,Android源码为Android 5.1

Linux平台上目前常用的专门针对无线网络设备编程的API有两套

最早的一套API由HP公司员工 Jean Tourrilhes于1997年开发,全称为 Linux Wireless Extensions。一般缩写为 wex 或 wext。 这套API使得用户空间的程序能通过 ioctl 函数来控制无线网卡驱动。
由于利用ioctl开展编程的方式不太符合 Linux 驱动开发的要求,后来 Linux 又提供了 cfg80211 和 nl80211 两套编程接口用于替代 wext。 其中, cfg80211 用于驱动开发,而 nl80211 API 供用户控件进程使用以操作那些利用 cfg80211 API 开发的无线网卡驱动。

Linux Wireless Extensions 介绍
所有用户空间发起的请求都统一包括在 struct iwreq 中:
android-5.1/external/kernel-headers/original/uapi/linux/wireless.h
//该结构体专门用于往socket句柄传递 ioctrl 控制参数
struct	iwreq 
{
	union
	{
		char	ifrn_name[IFNAMSIZ];	/* if name, e.g. "eth0" 用于指定要操作的网卡设备名,如 wlan0*/
	} ifr_ifrn;

	/* Data part (defined just above) */
	union	iwreq_data	u;	//用于存储具体的参数信息
};
union	iwreq_data
{
	/* Config - generic */
	char		name[IFNAMSIZ];
	/* Name : used to verify the presence of  wireless extensions.
	 * Name of the protocol/provider... */

	struct iw_point	essid;		/* Extended network name */
	struct iw_param	nwid;		/* network id (or domain - the cell) */
	struct iw_freq	freq;		/* frequency or channel :
					 * 0-1000 = channel
					 * > 1000 = frequency in Hz */

	struct iw_param	sens;		/* signal level threshold */
	struct iw_param	bitrate;	/* default bit rate */
	struct iw_param	txpower;	/* default transmit power */
	struct iw_param	rts;		/* RTS threshold threshold */
	struct iw_param	frag;		/* Fragmentation threshold */
	__u32		mode;		/* Operation mode */
	struct iw_param	retry;		/* Retry limits & lifetime */

	struct iw_point	encoding;	/* Encoding stuff : tokens */
	struct iw_param	power;		/* PM duration/timeout */
	struct iw_quality qual;		/* Quality part of statistics */

	struct sockaddr	ap_addr;	/* Access point address */
	struct sockaddr	addr;		/* Destination address (hw/mac) */

	struct iw_param	param;		/* Other small parameters */
	struct iw_point	data;		/* Other large parameters */
};

当参数信息的长度超过16字节时,就只能通过 iw_point 指向另外一块内存区域,而参数就存储在那个区域中。这就是我们常用的指针方式。

struct	iw_point
{
  void __user	*pointer;	/* Pointer to the data  (in user space) */
  __u16		length;		/* number of fields or size in bytes */
  __u16		flags;		/* Optional params */
};
当参数信息不超过16字节时,可以把信息存储在 iw_param 中。

struct	iw_param
{
  __s32		value;		/* The value of the parameter itself */
  __u8		fixed;		/* Hardware should not use auto select */
  __u8		disabled;	/* Disable the feature */
  __u16		flags;		/* Various specifc flags (if any) */
};
用于存储频率或信道值。
当频率小于109, m 直接等于频率。否则 m=f/(10e)

struct	iw_freq
{
	__s32		m;		/* Mantissa */
	__s16		e;		/* Exponent */
	__u8		i;		/* List index (when in range struct) 该值表示此频率对象在 channel_list 数组中的索引 */
	__u8		flags;		/* Flags (fixed/auto) 固定/自动 */
};
当参数字节超过16的时候, wext 还定义了和功能相关的参数类型:
数据结构 iw_scan_req 用于触发无线网卡发起扫描请求:

struct	iw_scan_req
{
	__u8		scan_type; /* IW_SCAN_TYPE_{ACTIVE,PASSIVE} 主动/被动扫描*/
	__u8		essid_len;
	__u8		num_channels; /* num entries in channel_list; 信道个数
				       * 0 = scan all allowed channels  0 扫描所有可允许的信道 */
	__u8		flags; /* reserved as padding; use zero, this may
				* be used in the future for adding flags
				* to request different scan behavior */
	struct sockaddr	bssid; /* ff:ff:ff:ff:ff:ff for broadcast BSSID or
				* individual address of a specific BSS 
				* bssid用于指明 BSS的地址。 如果全为 FF 则为广播 BSSID,即 wildcard bssid */

	/*
	 * Use this ESSID if IW_SCAN_THIS_ESSID flag is used instead of using
	 * the current ESSID. This allows scan requests for specific ESSID
	 * without having to change the current ESSID and potentially breaking
	 * the current association.
	 */
	__u8		essid[IW_ESSID_MAX_SIZE];

	/*
	 * Optional parameters for changing the default scanning behavior.
	 * These are based on the MLME-SCAN.request from IEEE Std 802.11.
	 * TU is 1.024 ms. If these are set to 0, driver is expected to use
	 * reasonable default values. min_channel_time defines the time that
	 * will be used to wait for the first reply on each channel. If no
	 * replies are received, next channel will be scanned after this. If
	 * replies are received, total time waited on the channel is defined by
	 * max_channel_time.
	 */
	__u32		min_channel_time; /* in TU 表示扫描过程中在每个信道等待到第一个回复的时间。如果在此时间内没有等到回复,跳到下一个信道等待。如果等到一个回复,则一共在该信道等待的最大时间为 max_channel_time 。所有时间单位均为TU(Time Units),即1024ms。*/
	__u32		max_channel_time; /* in TU */

	struct iw_freq	channel_list[IW_MAX_FREQUENCIES];//IW_MAX_FREQUENCIES = 32
};
wext API使用实例
本例来源于 wpa_supplicant ,它是一个运行于用户空间的专门和无线网卡进行交互的程序。 下面来看 wpa_supplicant 如何利用 wext API 和无线网卡交互。
android-5.1/external/wpa_supplicant_8/src/drivers/driver_wext.c

int wpa_driver_wext_scan(void *priv, struct wpa_driver_scan_params *params)
{
	struct wpa_driver_wext_data *drv = priv;
	struct iwreq iwr;	//定义一个 iwreq 对象
	int ret = 0, timeout;
	struct iw_scan_req req;	//定义一个 iw_scan_req 对象
	const u8 *ssid = params->ssids[0].ssid;
	size_t ssid_len = params->ssids[0].ssid_len;

	if (ssid_len > IW_ESSID_MAX_SIZE) {
		wpa_printf(MSG_DEBUG, "%s: too long SSID (%lu)",
			   __FUNCTION__, (unsigned long) ssid_len);
		return -1;
	}

	os_memset(&iwr, 0, sizeof(iwr));
	//为 iwr 的 ifr_name 传递需操作的网卡设备名
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);

	if (ssid && ssid_len) {
		os_memset(&req, 0, sizeof(req));
		//设置 iw_scan_req 的信息
		req.essid_len = ssid_len;
		req.bssid.sa_family = ARPHRD_ETHER;
		//设置 bssid 的 MAC 地址全为 0XFF, 代表这是一个 wildcard BSSID搜索
		os_memset(req.bssid.sa_data, 0xff, ETH_ALEN);
		os_memcpy(req.essid, ssid, ssid_len);
		//通过 data 域指向这个 iw_scan_req 对象
		iwr.u.data.pointer = (caddr_t) &req;
		iwr.u.data.length = sizeof(req);
		//IW_SCAN_THIS_ESSID 表示只扫描指定ESSID的无线网络
		iwr.u.data.flags = IW_SCAN_THIS_ESSID;
	}

	//ioctl_sock指向一个 socket 句柄
	//SIOCSIWSCAN 用于通知驱动进行无线网络扫描
	if (ioctl(drv->ioctl_sock, SIOCSIWSCAN, &iwr) < 0) {
		perror("ioctl[SIOCSIWSCAN]");
		ret = -1;
	}

	/* Not all drivers generate "scan completed" wireless event, so try to
	 * read results after a timeout. */
	timeout = 10;
	if (drv->scan_complete_events) {
		/*
		 * The driver seems to deliver SIOCGIWSCAN events to notify
		 * when scan is complete, so use longer timeout to avoid race
		 * conditions with scanning and following association request.
		 */
		timeout = 30;
	}
	wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
		   "seconds", ret, timeout);
	eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv, drv->ctx);
	eloop_register_timeout(timeout, 0, wpa_driver_wext_scan_timeout, drv,
			       drv->ctx);

	return ret;
}
netlink 编程
external/libnl/include/netlink/netlink.h

struct sockaddr_nl {
 //nl_family 取值必须为 AF_NETLINK 或 PF_NETLINK
 __kernel_sa_family_t nl_family;
 unsigned short nl_pad;	//必须为0,无用
 __u32 nl_pid; //看起来是存储进程pid的,但实际上它只是用于标示一个 netlink socket。所以用户空间只要保证进程内该值的唯一性即可。如果该值为0,表示通信的目标是 kernel。
 //每一个 netlink 协议都支持最多32个多播组,加入多播组的成员都能接收到对应的多播消息。
 //采用多播的方式能减少消息发送/接收的次数
 //nl_groups 为 0,表示只处理单播消息
 __u32 nl_groups;
};
nl80211 的核心就是通过 netlink 机制向 Kernel 中的无线网卡驱动发送特定的消息:
下面是通过 nl80211 触发网卡进行无线网络扫描:
android-5.1/external/wpa_supplicant_8/src/drivers/driver_nl80211.c

static int wpa_driver_nl80211_scan(struct i802_bss *bss,
				   struct wpa_driver_scan_params *params)
{
	struct wpa_driver_nl80211_data *drv = bss->drv;
	int ret = -1, timeout;
	struct nl_msg *msg = NULL;

	wpa_dbg(drv->ctx, MSG_DEBUG, "nl80211: scan request");
	drv->scan_for_auth = 0;

	//创建 nl80211 消息,其中 NL80211_CMD_TRIGGER_SCAN 是 nl80211 定义的命令,用于触发网络扫描
	msg = nl80211_scan_common(drv, NL80211_CMD_TRIGGER_SCAN, params,
				  bss->wdev_id_set ? &bss->wdev_id : NULL);
	if (!msg)
		return -1;

	if (params->p2p_probe) {
		struct nlattr *rates;

		wpa_printf(MSG_DEBUG, "nl80211: P2P probe - mask SuppRates");

		rates = nla_nest_start(msg, NL80211_ATTR_SCAN_SUPP_RATES);
		if (rates == NULL)
			goto nla_put_failure;

		/*
		 * Remove 2.4 GHz rates 1, 2, 5.5, 11 Mbps from supported rates
		 * by masking out everything else apart from the OFDM rates 6,
		 * 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS rates. All 5 GHz
		 * rates are left enabled.
		 */
		NLA_PUT(msg, NL80211_BAND_2GHZ, 8,
			"\x0c\x12\x18\x24\x30\x48\x60\x6c");
		nla_nest_end(msg, rates);

		NLA_PUT_FLAG(msg, NL80211_ATTR_TX_NO_CCK_RATE);
	}

	//发送 netlink 消息
	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
	msg = NULL;
	if (ret) {
		wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
			   "(%s)", ret, strerror(-ret));
		if (drv->hostapd && is_ap_interface(drv->nlmode)) {
			enum nl80211_iftype old_mode = drv->nlmode;

			/*
			 * mac80211 does not allow scan requests in AP mode, so
			 * try to do this in station mode.
			 */
			if (wpa_driver_nl80211_set_mode(
				    bss, NL80211_IFTYPE_STATION))
				goto nla_put_failure;

			if (wpa_driver_nl80211_scan(bss, params)) {
				wpa_driver_nl80211_set_mode(bss, drv->nlmode);
				goto nla_put_failure;
			}

			/* Restore AP mode when processing scan results */
			drv->ap_scan_as_station = old_mode;
			ret = 0;
		} else
			goto nla_put_failure;
	}

	drv->scan_state = SCAN_REQUESTED;
	/* Not all drivers generate "scan completed" wireless event, so try to
	 * read results after a timeout. */
	timeout = 10;
	if (drv->scan_complete_events) {
		/*
		 * The driver seems to deliver events to notify when scan is
		 * complete, so use longer timeout to avoid race conditions
		 * with scanning and following association request.
		 */
		timeout = 30;
	}
	wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
		   "seconds", ret, timeout);
	eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
	eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
			       drv, drv->ctx);

nla_put_failure:
	nlmsg_free(msg);
	return ret;
}
上面代码中的nl80211_scan_common
android-5.1/external/wpa_supplicant_8/src/drivers/driver_nl80211.c

static struct nl_msg *
nl80211_scan_common(struct wpa_driver_nl80211_data *drv, u8 cmd,
		    struct wpa_driver_scan_params *params, u64 *wdev_id)
{
	struct nl_msg *msg;
	size_t i;
	u32 scan_flags = 0;

	//分配一个 nl_msg 对象
	msg = nlmsg_alloc();
	if (!msg)
		return NULL;

	//nl80211_cmd 函数填充 nl_msg 信息
	nl80211_cmd(drv, msg, 0, cmd);

	if (!wdev_id)
		//NL80211_ATTR_IFINDEX 代表此次操作所指定的网络设备编号。
		NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
	else
		NLA_PUT_U64(msg, NL80211_ATTR_WDEV, *wdev_id);

	if (params->num_ssids) {
		struct nlattr *ssids;

		ssids = nla_nest_start(msg, NL80211_ATTR_SCAN_SSIDS);
		if (ssids == NULL)
			goto fail;
		for (i = 0; i < params->num_ssids; i++) {
			wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
					  params->ssids[i].ssid,
					  params->ssids[i].ssid_len);
			if (nla_put(msg, i + 1, params->ssids[i].ssid_len,
				    params->ssids[i].ssid) < 0)
				goto fail;
		}
		nla_nest_end(msg, ssids);
	}

	if (params->extra_ies) {
		wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
			    params->extra_ies, params->extra_ies_len);
		if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
			    params->extra_ies) < 0)
			goto fail;
	}

	if (params->freqs) {
		struct nlattr *freqs;
		freqs = nla_nest_start(msg, NL80211_ATTR_SCAN_FREQUENCIES);
		if (freqs == NULL)
			goto fail;
		for (i = 0; params->freqs[i]; i++) {
			wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
				   "MHz", params->freqs[i]);
			if (nla_put_u32(msg, i + 1, params->freqs[i]) < 0)
				goto fail;
		}
		nla_nest_end(msg, freqs);
	}

	os_free(drv->filter_ssids);
	drv->filter_ssids = params->filter_ssids;
	params->filter_ssids = NULL;
	drv->num_filter_ssids = params->num_filter_ssids;

	if (params->only_new_results) {
		wpa_printf(MSG_DEBUG, "nl80211: Add NL80211_SCAN_FLAG_FLUSH");
		scan_flags |= NL80211_SCAN_FLAG_FLUSH;
	}

	if (params->low_priority && drv->have_low_prio_scan) {
		wpa_printf(MSG_DEBUG,
			   "nl80211: Add NL80211_SCAN_FLAG_LOW_PRIORITY");
		scan_flags |= NL80211_SCAN_FLAG_LOW_PRIORITY;
	}

	if (scan_flags)
		NLA_PUT_U32(msg, NL80211_ATTR_SCAN_FLAGS, scan_flags);

	return msg;

fail:
nla_put_failure:
	nlmsg_free(msg);
	return NULL;
}
nl80211_copy.h定义了 802.11 相关的命令:
android-5.1/external/wpa_supplicant_8/src/drivers/nl80211_copy.h

enum nl80211_commands {
/* don't change the order or add anything between, this is ABI! */
	NL80211_CMD_UNSPEC,

	NL80211_CMD_GET_WIPHY,		/* can dump */
	NL80211_CMD_SET_WIPHY,
	NL80211_CMD_NEW_WIPHY,
	NL80211_CMD_DEL_WIPHY,

	NL80211_CMD_GET_INTERFACE,	/* can dump */
	NL80211_CMD_SET_INTERFACE,
	NL80211_CMD_NEW_INTERFACE,
	NL80211_CMD_DEL_INTERFACE,

	NL80211_CMD_GET_KEY,
	NL80211_CMD_SET_KEY,
	NL80211_CMD_NEW_KEY,
	NL80211_CMD_DEL_KEY,

	NL80211_CMD_GET_BEACON,
	NL80211_CMD_SET_BEACON,
	NL80211_CMD_START_AP,
	NL80211_CMD_NEW_BEACON = NL80211_CMD_START_AP,
	NL80211_CMD_STOP_AP,
	NL80211_CMD_DEL_BEACON = NL80211_CMD_STOP_AP,

	NL80211_CMD_GET_STATION,
	NL80211_CMD_SET_STATION,
	NL80211_CMD_NEW_STATION,
	NL80211_CMD_DEL_STATION,

	NL80211_CMD_GET_MPATH,
	NL80211_CMD_SET_MPATH,
	NL80211_CMD_NEW_MPATH,
	NL80211_CMD_DEL_MPATH,

	NL80211_CMD_SET_BSS,

	NL80211_CMD_SET_REG,
	NL80211_CMD_REQ_SET_REG,

	NL80211_CMD_GET_MESH_CONFIG,
	NL80211_CMD_SET_MESH_CONFIG,

	NL80211_CMD_SET_MGMT_EXTRA_IE /* reserved; not used */,

	NL80211_CMD_GET_REG,

	NL80211_CMD_GET_SCAN,
	NL80211_CMD_TRIGGER_SCAN,
	NL80211_CMD_NEW_SCAN_RESULTS,
	NL80211_CMD_SCAN_ABORTED,

	NL80211_CMD_REG_CHANGE,

	NL80211_CMD_AUTHENTICATE,
	NL80211_CMD_ASSOCIATE,
	NL80211_CMD_DEAUTHENTICATE,
	NL80211_CMD_DISASSOCIATE,

	NL80211_CMD_MICHAEL_MIC_FAILURE,

	NL80211_CMD_REG_BEACON_HINT,

	NL80211_CMD_JOIN_IBSS,
	NL80211_CMD_LEAVE_IBSS,

	NL80211_CMD_TESTMODE,

	NL80211_CMD_CONNECT,
	NL80211_CMD_ROAM,
	NL80211_CMD_DISCONNECT,

	NL80211_CMD_SET_WIPHY_NETNS,

	NL80211_CMD_GET_SURVEY,
	NL80211_CMD_NEW_SURVEY_RESULTS,

	NL80211_CMD_SET_PMKSA,
	NL80211_CMD_DEL_PMKSA,
	NL80211_CMD_FLUSH_PMKSA,

	NL80211_CMD_REMAIN_ON_CHANNEL,
	NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL,

	NL80211_CMD_SET_TX_BITRATE_MASK,

	NL80211_CMD_REGISTER_FRAME,
	NL80211_CMD_REGISTER_ACTION = NL80211_CMD_REGISTER_FRAME,
	NL80211_CMD_FRAME,
	NL80211_CMD_ACTION = NL80211_CMD_FRAME,
	NL80211_CMD_FRAME_TX_STATUS,
	NL80211_CMD_ACTION_TX_STATUS = NL80211_CMD_FRAME_TX_STATUS,

	NL80211_CMD_SET_POWER_SAVE,
	NL80211_CMD_GET_POWER_SAVE,

	NL80211_CMD_SET_CQM,
	NL80211_CMD_NOTIFY_CQM,

	NL80211_CMD_SET_CHANNEL,
	NL80211_CMD_SET_WDS_PEER,

	NL80211_CMD_FRAME_WAIT_CANCEL,

	NL80211_CMD_JOIN_MESH,
	NL80211_CMD_LEAVE_MESH,

	NL80211_CMD_UNPROT_DEAUTHENTICATE,
	NL80211_CMD_UNPROT_DISASSOCIATE,

	NL80211_CMD_NEW_PEER_CANDIDATE,

	NL80211_CMD_GET_WOWLAN,
	NL80211_CMD_SET_WOWLAN,

	NL80211_CMD_START_SCHED_SCAN,
	NL80211_CMD_STOP_SCHED_SCAN,
	NL80211_CMD_SCHED_SCAN_RESULTS,
	NL80211_CMD_SCHED_SCAN_STOPPED,

	NL80211_CMD_SET_REKEY_OFFLOAD,

	NL80211_CMD_PMKSA_CANDIDATE,

	NL80211_CMD_TDLS_OPER,
	NL80211_CMD_TDLS_MGMT,

	NL80211_CMD_UNEXPECTED_FRAME,

	NL80211_CMD_PROBE_CLIENT,

	NL80211_CMD_REGISTER_BEACONS,

	NL80211_CMD_UNEXPECTED_4ADDR_FRAME,

	NL80211_CMD_SET_NOACK_MAP,

	NL80211_CMD_CH_SWITCH_NOTIFY,

	NL80211_CMD_START_P2P_DEVICE,
	NL80211_CMD_STOP_P2P_DEVICE,

	NL80211_CMD_CONN_FAILED,

	NL80211_CMD_SET_MCAST_RATE,

	NL80211_CMD_SET_MAC_ACL,

	NL80211_CMD_RADAR_DETECT,

	NL80211_CMD_GET_PROTOCOL_FEATURES,

	NL80211_CMD_UPDATE_FT_IES,
	NL80211_CMD_FT_EVENT,

	NL80211_CMD_CRIT_PROTOCOL_START,
	NL80211_CMD_CRIT_PROTOCOL_STOP,

	NL80211_CMD_GET_COALESCE,
	NL80211_CMD_SET_COALESCE,

	NL80211_CMD_CHANNEL_SWITCH,

	NL80211_CMD_VENDOR,

	NL80211_CMD_SET_QOS_MAP,

	NL80211_CMD_ADD_TX_TS,
	NL80211_CMD_DEL_TX_TS,

	/* add new commands above here */

	/* used to define NL80211_CMD_MAX below */
	__NL80211_CMD_AFTER_LAST,
	NL80211_CMD_MAX = __NL80211_CMD_AFTER_LAST - 1
};
属性的取值:

enum nl80211_attrs {
/* don't change the order or add anything inbetween, this is ABI! */
	NL80211_ATTR_UNSPEC,

	NL80211_ATTR_WIPHY,
	NL80211_ATTR_WIPHY_NAME,

	NL80211_ATTR_IFINDEX,
	NL80211_ATTR_IFNAME,
	NL80211_ATTR_IFTYPE,

	NL80211_ATTR_MAC,

	NL80211_ATTR_KEY_DATA,
	NL80211_ATTR_KEY_IDX,
	NL80211_ATTR_KEY_CIPHER,
	NL80211_ATTR_KEY_SEQ,
	NL80211_ATTR_KEY_DEFAULT,

	NL80211_ATTR_BEACON_INTERVAL,
	NL80211_ATTR_DTIM_PERIOD,
	NL80211_ATTR_BEACON_HEAD,
	NL80211_ATTR_BEACON_TAIL,

	NL80211_ATTR_STA_AID,
	NL80211_ATTR_STA_FLAGS,
	NL80211_ATTR_STA_LISTEN_INTERVAL,
	NL80211_ATTR_STA_SUPPORTED_RATES,
	NL80211_ATTR_STA_VLAN,
	NL80211_ATTR_STA_INFO,

	NL80211_ATTR_WIPHY_BANDS,

	NL80211_ATTR_MNTR_FLAGS,

	NL80211_ATTR_MESH_ID,
	NL80211_ATTR_STA_PLINK_ACTION,
	NL80211_ATTR_MPATH_NEXT_HOP,
	NL80211_ATTR_MPATH_INFO,

	NL80211_ATTR_BSS_CTS_PROT,
	NL80211_ATTR_BSS_SHORT_PREAMBLE,
	NL80211_ATTR_BSS_SHORT_SLOT_TIME,

	NL80211_ATTR_HT_CAPABILITY,

	NL80211_ATTR_SUPPORTED_IFTYPES,

	NL80211_ATTR_REG_ALPHA2,
	NL80211_ATTR_REG_RULES,

	NL80211_ATTR_MESH_PARAMS,

	NL80211_ATTR_BSS_BASIC_RATES,

	NL80211_ATTR_WIPHY_TXQ_PARAMS,
	NL80211_ATTR_WIPHY_FREQ,
	NL80211_ATTR_WIPHY_CHANNEL_TYPE,

	NL80211_ATTR_KEY_DEFAULT_MGMT,

	NL80211_ATTR_MGMT_SUBTYPE,
	NL80211_ATTR_IE,

	NL80211_ATTR_MAX_NUM_SCAN_SSIDS,

	NL80211_ATTR_SCAN_FREQUENCIES,
	NL80211_ATTR_SCAN_SSIDS,
	NL80211_ATTR_GENERATION, /* replaces old SCAN_GENERATION */
	NL80211_ATTR_BSS,

	NL80211_ATTR_REG_INITIATOR,
	NL80211_ATTR_REG_TYPE,

	NL80211_ATTR_SUPPORTED_COMMANDS,

	NL80211_ATTR_FRAME,
	NL80211_ATTR_SSID,
	NL80211_ATTR_AUTH_TYPE,
	NL80211_ATTR_REASON_CODE,

	NL80211_ATTR_KEY_TYPE,

	NL80211_ATTR_MAX_SCAN_IE_LEN,
	NL80211_ATTR_CIPHER_SUITES,

	NL80211_ATTR_FREQ_BEFORE,
	NL80211_ATTR_FREQ_AFTER,

	NL80211_ATTR_FREQ_FIXED,


	NL80211_ATTR_WIPHY_RETRY_SHORT,
	NL80211_ATTR_WIPHY_RETRY_LONG,
	NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
	NL80211_ATTR_WIPHY_RTS_THRESHOLD,

	NL80211_ATTR_TIMED_OUT,

	NL80211_ATTR_USE_MFP,

	NL80211_ATTR_STA_FLAGS2,

	NL80211_ATTR_CONTROL_PORT,

	NL80211_ATTR_TESTDATA,

	NL80211_ATTR_PRIVACY,

	NL80211_ATTR_DISCONNECTED_BY_AP,
	NL80211_ATTR_STATUS_CODE,

	NL80211_ATTR_CIPHER_SUITES_PAIRWISE,
	NL80211_ATTR_CIPHER_SUITE_GROUP,
	NL80211_ATTR_WPA_VERSIONS,
	NL80211_ATTR_AKM_SUITES,

	NL80211_ATTR_REQ_IE,
	NL80211_ATTR_RESP_IE,

	NL80211_ATTR_PREV_BSSID,

	NL80211_ATTR_KEY,
	NL80211_ATTR_KEYS,

	NL80211_ATTR_PID,

	NL80211_ATTR_4ADDR,

	NL80211_ATTR_SURVEY_INFO,

	/* add attributes here, update the policy in nl80211.c */

	__NL80211_ATTR_AFTER_LAST,
	NL80211_ATTR_MAX = __NL80211_ATTR_AFTER_LAST - 1
};

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