ieee80211.h

Source for the 802.11 (wireless) network stack for Linux

	u8 rates[MAX_RATES_LENGTH];
	u8 rates_len;
	u8 rates_ex[MAX_RATES_EX_LENGTH];
	u8 rates_ex_len;
	unsigned long last_scanned;
	u8 mode;
	u8 flags;
	u32 last_associate;
	u32 time_stamp[2];
	u16 beacon_interval;
	u16 listen_interval;
	u16 atim_window;
	u8 erp_value;
	u8 wpa_ie[MAX_WPA_IE_LEN];
	size_t wpa_ie_len;
	u8 rsn_ie[MAX_WPA_IE_LEN];
	size_t rsn_ie_len;
	struct ieee80211_tim_parameters tim;
	struct list_head list;
};

enum ieee80211_state {
	IEEE80211_UNINITIALIZED = 0,
	IEEE80211_INITIALIZED,
	IEEE80211_ASSOCIATING,
	IEEE80211_ASSOCIATED,
	IEEE80211_AUTHENTICATING,
	IEEE80211_AUTHENTICATED,
	IEEE80211_SHUTDOWN
};

#define DEFAULT_MAX_SCAN_AGE (15 * HZ)
#define DEFAULT_FTS 2346

#define CFG_IEEE80211_RESERVE_FCS (1<<0)
#define CFG_IEEE80211_COMPUTE_FCS (1<<1)
#define CFG_IEEE80211_RTS (1<<2)

#define IEEE80211_24GHZ_MIN_CHANNEL 1
#define IEEE80211_24GHZ_MAX_CHANNEL 14
#define IEEE80211_24GHZ_CHANNELS    14

#define IEEE80211_52GHZ_MIN_CHANNEL 36
#define IEEE80211_52GHZ_MAX_CHANNEL 165
#define IEEE80211_52GHZ_CHANNELS    32

enum {
	IEEE80211_CH_PASSIVE_ONLY = (1 << 0),
	IEEE80211_CH_B_ONLY = (1 << 2),
	IEEE80211_CH_NO_IBSS = (1 << 3),
	IEEE80211_CH_UNIFORM_SPREADING = (1 << 4),
	IEEE80211_CH_RADAR_DETECT = (1 << 5),
	IEEE80211_CH_INVALID = (1 << 6),
};

struct ieee80211_channel {
	u32 freq;
	u8 channel;
	u8 flags;
	u8 max_power;
};

struct ieee80211_geo {
	u8 name[4];
	u8 bg_channels;
	u8 a_channels;
	struct ieee80211_channel bg[IEEE80211_24GHZ_CHANNELS];
	struct ieee80211_channel a[IEEE80211_52GHZ_CHANNELS];
};

struct ieee80211_device {
	struct net_device *dev;
	struct ieee80211_security sec;

	/* Bookkeeping structures */
	struct net_device_stats stats;
	struct ieee80211_stats ieee_stats;

	struct ieee80211_geo geo;

	/* Probe / Beacon management */
	struct list_head network_free_list;
	struct list_head network_list;
	struct ieee80211_network *networks;
	int scans;
	int scan_age;

	int iw_mode;		/* operating mode (IW_MODE_*) */
	struct iw_spy_data spy_data;	/* iwspy support */

	spinlock_t lock;

	int tx_headroom;	/* Set to size of any additional room needed at front
				 * of allocated Tx SKBs */
	u32 config;

	/* WEP and other encryption related settings at the device level */
	int open_wep;		/* Set to 1 to allow unencrypted frames */

	int reset_on_keychange;	/* Set to 1 if the HW needs to be reset on
				 * WEP key changes */

	/* If the host performs {en,de}cryption, then set to 1 */
	int host_encrypt;
	int host_encrypt_msdu;
	int host_decrypt;
	/* host performs multicast decryption */
	int host_mc_decrypt;

	int host_open_frag;
	int host_build_iv;
	int ieee802_1x;		/* is IEEE 802.1X used */

	/* WPA data */
	int wpa_enabled;
	int drop_unencrypted;
	int privacy_invoked;
	size_t wpa_ie_len;
	u8 *wpa_ie;

	struct list_head crypt_deinit_list;
	struct ieee80211_crypt_data *crypt[WEP_KEYS];
	int tx_keyidx;		/* default TX key index (crypt[tx_keyidx]) */
	struct timer_list crypt_deinit_timer;
	int crypt_quiesced;

	int bcrx_sta_key;	/* use individual keys to override default keys even
				 * with RX of broad/multicast frames */

	/* Fragmentation structures */
	struct ieee80211_frag_entry frag_cache[IEEE80211_FRAG_CACHE_LEN];
	unsigned int frag_next_idx;
	u16 fts;		/* Fragmentation Threshold */
	u16 rts;		/* RTS threshold */

	/* Association info */
	u8 bssid[ETH_ALEN];

	enum ieee80211_state state;

	int mode;		/* A, B, G */
	int modulation;		/* CCK, OFDM */
	int freq_band;		/* 2.4Ghz, 5.2Ghz, Mixed */
	int abg_true;		/* ABG flag              */

	int perfect_rssi;
	int worst_rssi;

	/* Callback functions */
	void (*set_security) (struct net_device * dev,
			      struct ieee80211_security * sec);
	int (*hard_start_xmit) (struct ieee80211_txb * txb,
				struct net_device * dev, int pri);
	int (*reset_port) (struct net_device * dev);
	int (*is_queue_full) (struct net_device * dev, int pri);

	int (*handle_management) (struct net_device * dev,
				  struct ieee80211_network * network, u16 type);

	/* Typical STA methods */
	int (*handle_auth) (struct net_device * dev,
			    struct ieee80211_auth * auth);
	int (*handle_deauth) (struct net_device * dev,
			      struct ieee80211_auth * auth);
	int (*handle_disassoc) (struct net_device * dev,
				struct ieee80211_disassoc * assoc);
	int (*handle_beacon) (struct net_device * dev,
			      struct ieee80211_beacon * beacon,
			      struct ieee80211_network * network);
	int (*handle_probe_response) (struct net_device * dev,
				      struct ieee80211_probe_response * resp,
				      struct ieee80211_network * network);
	int (*handle_probe_request) (struct net_device * dev,
				     struct ieee80211_probe_request * req,
				     struct ieee80211_rx_stats * stats);
	int (*handle_assoc_response) (struct net_device * dev,
				      struct ieee80211_assoc_response * resp,
				      struct ieee80211_network * network);

	/* Typical AP methods */
	int (*handle_assoc_request) (struct net_device * dev);
	int (*handle_reassoc_request) (struct net_device * dev,
				       struct ieee80211_reassoc_request * req);

	/* This must be the last item so that it points to the data
	 * allocated beyond this structure by alloc_ieee80211 */
	u8 priv[0];
};

#define IEEE_A            (1<<0)
#define IEEE_B            (1<<1)
#define IEEE_G            (1<<2)
#define IEEE_MODE_MASK    (IEEE_A|IEEE_B|IEEE_G)

#include <linux/version.h>	/* KERNEL_VERSION */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,12)
static inline int is_multicast_ether_addr(const u8 *addr)
{
       return addr[0] & 0x01;
}
#endif

static inline void *ieee80211_priv(struct net_device *dev)
{
	return ((struct ieee80211_device *)netdev_priv(dev))->priv;
}

static inline int ieee80211_is_broadcast_ether_addr(const u8 *addr)
{
	return (addr[0] == 0xff && addr[1] == 0xff && addr[2] == 0xff &&
		addr[3] == 0xff && addr[4] == 0xff && addr[5] == 0xff);
}

static inline int ieee80211_is_empty_essid(const char *essid, int essid_len)
{
	/* Single white space is for Linksys APs */
	if (essid_len == 1 && essid[0] == ' ')
		return 1;

	/* Otherwise, if the entire essid is 0, we assume it is hidden */
	while (essid_len) {
		essid_len--;
		if (essid[essid_len] != '\0')
			return 0;
	}

	return 1;
}

static inline int ieee80211_is_valid_mode(struct ieee80211_device *ieee,
					  int mode)
{
	/*
	 * It is possible for both access points and our device to support
	 * combinations of modes, so as long as there is one valid combination
	 * of ap/device supported modes, then return success
	 *
	 */
	if ((mode & IEEE_A) &&
	    (ieee->modulation & IEEE80211_OFDM_MODULATION) &&
	    (ieee->freq_band & IEEE80211_52GHZ_BAND))
		return 1;

	if ((mode & IEEE_G) &&
	    (ieee->modulation & IEEE80211_OFDM_MODULATION) &&
	    (ieee->freq_band & IEEE80211_24GHZ_BAND))
		return 1;

	if ((mode & IEEE_B) &&
	    (ieee->modulation & IEEE80211_CCK_MODULATION) &&
	    (ieee->freq_band & IEEE80211_24GHZ_BAND))
		return 1;

	return 0;
}

static inline int ieee80211_get_hdrlen(u16 fc)
{
	int hdrlen = IEEE80211_3ADDR_LEN;
	u16 stype = WLAN_FC_GET_STYPE(fc);

	switch (WLAN_FC_GET_TYPE(fc)) {
	case IEEE80211_FTYPE_DATA:
		if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
			hdrlen = IEEE80211_4ADDR_LEN;
		if (stype & IEEE80211_STYPE_QOS_DATA)
			hdrlen += 2;
		break;
	case IEEE80211_FTYPE_CTL:
		switch (WLAN_FC_GET_STYPE(fc)) {
		case IEEE80211_STYPE_CTS:
		case IEEE80211_STYPE_ACK:
			hdrlen = IEEE80211_1ADDR_LEN;
			break;
		default:
			hdrlen = IEEE80211_2ADDR_LEN;
			break;
		}
		break;
	}

	return hdrlen;
}

static inline u8 *ieee80211_get_payload(struct ieee80211_hdr *hdr)
{
	switch (ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_ctl))) {
	case IEEE80211_1ADDR_LEN:
		return ((struct ieee80211_hdr_1addr *)hdr)->payload;
	case IEEE80211_2ADDR_LEN:
		return ((struct ieee80211_hdr_2addr *)hdr)->payload;
	case IEEE80211_3ADDR_LEN:
		return ((struct ieee80211_hdr_3addr *)hdr)->payload;
	case IEEE80211_4ADDR_LEN:
		return ((struct ieee80211_hdr_4addr *)hdr)->payload;
	}

}

static inline int ieee80211_is_ofdm_rate(u8 rate)
{
	switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
	case IEEE80211_OFDM_RATE_6MB:
	case IEEE80211_OFDM_RATE_9MB:
	case IEEE80211_OFDM_RATE_12MB:
	case IEEE80211_OFDM_RATE_18MB:
	case IEEE80211_OFDM_RATE_24MB:
	case IEEE80211_OFDM_RATE_36MB:
	case IEEE80211_OFDM_RATE_48MB:
	case IEEE80211_OFDM_RATE_54MB:
		return 1;
	}
	return 0;
}

static inline int ieee80211_is_cck_rate(u8 rate)
{
	switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
	case IEEE80211_CCK_RATE_1MB:
	case IEEE80211_CCK_RATE_2MB:
	case IEEE80211_CCK_RATE_5MB:
	case IEEE80211_CCK_RATE_11MB:
		return 1;
	}
	return 0;
}

/* ieee80211.c */
extern void free_ieee80211(struct net_device *dev);
extern struct net_device *alloc_ieee80211(int sizeof_priv);

extern int ieee80211_set_encryption(struct ieee80211_device *ieee);

/* ieee80211_tx.c */
extern int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev);
extern void ieee80211_txb_free(struct ieee80211_txb *);
extern int ieee80211_tx_frame(struct ieee80211_device *ieee,
			      struct ieee80211_hdr *frame, int len);

/* ieee80211_rx.c */
extern int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb,
			struct ieee80211_rx_stats *rx_stats);
extern void ieee80211_rx_mgt(struct ieee80211_device *ieee,
			     struct ieee80211_hdr_4addr *header,
			     struct ieee80211_rx_stats *stats);

/* ieee80211_geo.c */
extern const struct ieee80211_geo *ieee80211_get_geo(struct ieee80211_device
						     *ieee);
extern int ieee80211_set_geo(struct ieee80211_device *ieee,
			     const struct ieee80211_geo *geo);

extern int ieee80211_is_valid_channel(struct ieee80211_device *ieee,
				      u8 channel);
extern int ieee80211_channel_to_index(struct ieee80211_device *ieee,
				      u8 channel);
extern u8 ieee80211_freq_to_channel(struct ieee80211_device *ieee, u32 freq);

/* ieee80211_wx.c */
extern int ieee80211_wx_get_scan(struct ieee80211_device *ieee,
				 struct iw_request_info *info,
				 union iwreq_data *wrqu, char *key);
extern int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
				   struct iw_request_info *info,
				   union iwreq_data *wrqu, char *key);
extern int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
				   struct iw_request_info *info,
				   union iwreq_data *wrqu, char *key);
extern int ieee80211_wx_set_encodeext(struct ieee80211_device *ieee,
				      struct iw_request_info *info,
				      union iwreq_data *wrqu, char *extra);
extern int ieee80211_wx_get_encodeext(struct ieee80211_device *ieee,
				      struct iw_request_info *info,
				      union iwreq_data *wrqu, char *extra);

static inline void ieee80211_increment_scans(struct ieee80211_device *ieee)
{
	ieee->scans++;
}

static inline int ieee80211_get_scans(struct ieee80211_device *ieee)
{
	return ieee->scans;
}

#endif				/* IEEE80211_H */