text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef HOSTAP_AP_H
  #define HOSTAP_AP_H
  
  #include "hostap_80211.h"
  
  /* AP data structures for STAs */
  
  /* maximum number of frames to buffer per STA */
  #define STA_MAX_TX_BUFFER 32
  
  /* STA flags */
  #define WLAN_STA_AUTH BIT(0)
  #define WLAN_STA_ASSOC BIT(1)
  #define WLAN_STA_PS BIT(2)
  #define WLAN_STA_TIM BIT(3) /* TIM bit is on for PS stations */
  #define WLAN_STA_PERM BIT(4) /* permanent; do not remove entry on expiration */
  #define WLAN_STA_AUTHORIZED BIT(5) /* If 802.1X is used, this flag is
  				    * controlling whether STA is authorized to
  				    * send and receive non-IEEE 802.1X frames
  				    */
  #define WLAN_STA_PENDING_POLL BIT(6) /* pending activity poll not ACKed */
  
  #define WLAN_RATE_1M BIT(0)
  #define WLAN_RATE_2M BIT(1)
  #define WLAN_RATE_5M5 BIT(2)
  #define WLAN_RATE_11M BIT(3)
  #define WLAN_RATE_COUNT 4
  
  /* Maximum size of Supported Rates info element. IEEE 802.11 has a limit of 8,
   * but some pre-standard IEEE 802.11g products use longer elements. */
  #define WLAN_SUPP_RATES_MAX 32
  
  /* Try to increase TX rate after # successfully sent consecutive packets */
  #define WLAN_RATE_UPDATE_COUNT 50
  
  /* Decrease TX rate after # consecutive dropped packets */
  #define WLAN_RATE_DECREASE_THRESHOLD 2
  
  struct sta_info {
  	struct list_head list;
  	struct sta_info *hnext; /* next entry in hash table list */
  	atomic_t users; /* number of users (do not remove if > 0) */
  	struct proc_dir_entry *proc;
  
  	u8 addr[6];
  	u16 aid; /* STA's unique AID (1 .. 2007) or 0 if not yet assigned */
  	u32 flags;
  	u16 capability;
  	u16 listen_interval; /* or beacon_int for APs */
  	u8 supported_rates[WLAN_SUPP_RATES_MAX];
  
  	unsigned long last_auth;
  	unsigned long last_assoc;
  	unsigned long last_rx;
  	unsigned long last_tx;
  	unsigned long rx_packets, tx_packets;
  	unsigned long rx_bytes, tx_bytes;
  	struct sk_buff_head tx_buf;
  	/* FIX: timeout buffers with an expiry time somehow derived from
  	 * listen_interval */
  
  	s8 last_rx_silence; /* Noise in dBm */
  	s8 last_rx_signal; /* Signal strength in dBm */
  	u8 last_rx_rate; /* TX rate in 0.1 Mbps */
  	u8 last_rx_updated; /* IWSPY's struct iw_quality::updated */
  
  	u8 tx_supp_rates; /* bit field of supported TX rates */
  	u8 tx_rate; /* current TX rate (in 0.1 Mbps) */
  	u8 tx_rate_idx; /* current TX rate (WLAN_RATE_*) */
  	u8 tx_max_rate; /* max TX rate (WLAN_RATE_*) */
  	u32 tx_count[WLAN_RATE_COUNT]; /* number of frames sent (per rate) */
  	u32 rx_count[WLAN_RATE_COUNT]; /* number of frames received (per rate)
  					*/
  	u32 tx_since_last_failure;
  	u32 tx_consecutive_exc;
  
  	struct lib80211_crypt_data *crypt;
  
  	int ap; /* whether this station is an AP */
  
  	local_info_t *local;
  
  #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
  	union {
  		struct {
  			char *challenge; /* shared key authentication
  					  * challenge */
  		} sta;
  		struct {
  			int ssid_len;
  			unsigned char ssid[MAX_SSID_LEN + 1]; /* AP's ssid */
  			int channel;
  			unsigned long last_beacon; /* last RX beacon time */
  		} ap;
  	} u;
  
  	struct timer_list timer;
  	enum { STA_NULLFUNC = 0, STA_DISASSOC, STA_DEAUTH } timeout_next;
  #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
  };
  
  
  #define MAX_STA_COUNT 1024
  
  /* Maximum number of AIDs to use for STAs; must be 2007 or lower
   * (8802.11 limitation) */
  #define MAX_AID_TABLE_SIZE 128
  
  #define STA_HASH_SIZE 256
  #define STA_HASH(sta) (sta[5])
  
  
  /* Default value for maximum station inactivity. After AP_MAX_INACTIVITY_SEC
   * has passed since last received frame from the station, a nullfunc data
   * frame is sent to the station. If this frame is not acknowledged and no other
   * frames have been received, the station will be disassociated after
   * AP_DISASSOC_DELAY. Similarly, a the station will be deauthenticated after
   * AP_DEAUTH_DELAY. AP_TIMEOUT_RESOLUTION is the resolution that is used with
   * max inactivity timer. */
  #define AP_MAX_INACTIVITY_SEC (5 * 60)
  #define AP_DISASSOC_DELAY (HZ)
  #define AP_DEAUTH_DELAY (HZ)
  
  /* ap_policy: whether to accept frames to/from other APs/IBSS */
  typedef enum {
  	AP_OTHER_AP_SKIP_ALL = 0,
  	AP_OTHER_AP_SAME_SSID = 1,
  	AP_OTHER_AP_ALL = 2,
  	AP_OTHER_AP_EVEN_IBSS = 3
  } ap_policy_enum;
  
  #define PRISM2_AUTH_OPEN BIT(0)
  #define PRISM2_AUTH_SHARED_KEY BIT(1)
  
  
  /* MAC address-based restrictions */
  struct mac_entry {
  	struct list_head list;
  	u8 addr[6];
  };
  
  struct mac_restrictions {
  	enum { MAC_POLICY_OPEN = 0, MAC_POLICY_ALLOW, MAC_POLICY_DENY } policy;
  	unsigned int entries;
  	struct list_head mac_list;
  	spinlock_t lock;
  };
  
  
  struct add_sta_proc_data {
  	u8 addr[ETH_ALEN];
  	struct add_sta_proc_data *next;
  };
  
  
  typedef enum { WDS_ADD, WDS_DEL } wds_oper_type;
  struct wds_oper_data {
  	wds_oper_type type;
  	u8 addr[ETH_ALEN];
  	struct wds_oper_data *next;
  };
  
  
  struct ap_data {
  	int initialized; /* whether ap_data has been initialized */
  	local_info_t *local;
  	int bridge_packets; /* send packet to associated STAs directly to the
  			     * wireless media instead of higher layers in the
  			     * kernel */
  	unsigned int bridged_unicast; /* number of unicast frames bridged on
  				       * wireless media */
  	unsigned int bridged_multicast; /* number of non-unicast frames
  					 * bridged on wireless media */
  	unsigned int tx_drop_nonassoc; /* number of unicast TX packets dropped
  					* because they were to an address that
  					* was not associated */
  	int nullfunc_ack; /* use workaround for nullfunc frame ACKs */
  
  	spinlock_t sta_table_lock;
  	int num_sta; /* number of entries in sta_list */
  	struct list_head sta_list; /* STA info list head */
  	struct sta_info *sta_hash[STA_HASH_SIZE];
  
  	struct proc_dir_entry *proc;
  
  	ap_policy_enum ap_policy;
  	unsigned int max_inactivity;
  	int autom_ap_wds;
  
  	struct mac_restrictions mac_restrictions; /* MAC-based auth */
  	int last_tx_rate;
  
  	struct work_struct add_sta_proc_queue;
  	struct add_sta_proc_data *add_sta_proc_entries;
  
  	struct work_struct wds_oper_queue;
  	struct wds_oper_data *wds_oper_entries;
  
  	u16 tx_callback_idx;
  
  #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
  	/* pointers to STA info; based on allocated AID or NULL if AID free
  	 * AID is in the range 1-2007, so sta_aid[0] corresponders to AID 1
  	 * and so on
  	 */
  	struct sta_info *sta_aid[MAX_AID_TABLE_SIZE];
  
  	u16 tx_callback_auth, tx_callback_assoc, tx_callback_poll;
  
  	/* WEP operations for generating challenges to be used with shared key
  	 * authentication */
  	struct lib80211_crypto_ops *crypt;
  	void *crypt_priv;
  #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
  };
  
  
  void hostap_rx(struct net_device *dev, struct sk_buff *skb,
  	       struct hostap_80211_rx_status *rx_stats);
  void hostap_init_data(local_info_t *local);
  void hostap_init_ap_proc(local_info_t *local);
  void hostap_free_data(struct ap_data *ap);
  void hostap_check_sta_fw_version(struct ap_data *ap, int sta_fw_ver);
  
  typedef enum {
  	AP_TX_CONTINUE, AP_TX_DROP, AP_TX_RETRY, AP_TX_BUFFERED,
  	AP_TX_CONTINUE_NOT_AUTHORIZED
  } ap_tx_ret;
  struct hostap_tx_data {
  	struct sk_buff *skb;
  	int host_encrypt;
  	struct lib80211_crypt_data *crypt;
  	void *sta_ptr;
  };
  ap_tx_ret hostap_handle_sta_tx(local_info_t *local, struct hostap_tx_data *tx);
  void hostap_handle_sta_release(void *ptr);
  void hostap_handle_sta_tx_exc(local_info_t *local, struct sk_buff *skb);
  int hostap_update_sta_ps(local_info_t *local, struct ieee80211_hdr *hdr);
  typedef enum {
  	AP_RX_CONTINUE, AP_RX_DROP, AP_RX_EXIT, AP_RX_CONTINUE_NOT_AUTHORIZED
  } ap_rx_ret;
  ap_rx_ret hostap_handle_sta_rx(local_info_t *local, struct net_device *dev,
  			       struct sk_buff *skb,
  			       struct hostap_80211_rx_status *rx_stats,
  			       int wds);
  int hostap_handle_sta_crypto(local_info_t *local, struct ieee80211_hdr *hdr,
  			     struct lib80211_crypt_data **crypt,
  			     void **sta_ptr);
  int hostap_is_sta_assoc(struct ap_data *ap, u8 *sta_addr);
  int hostap_is_sta_authorized(struct ap_data *ap, u8 *sta_addr);
  int hostap_add_sta(struct ap_data *ap, u8 *sta_addr);
  int hostap_update_rx_stats(struct ap_data *ap, struct ieee80211_hdr *hdr,
  			   struct hostap_80211_rx_status *rx_stats);
  void hostap_update_rates(local_info_t *local);
  void hostap_add_wds_links(local_info_t *local);
  void hostap_wds_link_oper(local_info_t *local, u8 *addr, wds_oper_type type);
  
  #ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
  void hostap_deauth_all_stas(struct net_device *dev, struct ap_data *ap,
  			    int resend);
  #endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */
  
  #endif /* HOSTAP_AP_H */
  