/*
   * Copyright 2002-2004, Instant802 Networks, Inc.
   * Copyright 2005, Devicescape Software, 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.
   */
  
  #ifndef IEEE80211_KEY_H
  #define IEEE80211_KEY_H
  
  #include <linux/types.h>
  #include <linux/list.h>
  #include <linux/crypto.h>
  #include <linux/rcupdate.h>
  #include <net/mac80211.h>
  
  #define NUM_DEFAULT_KEYS 4
  #define NUM_DEFAULT_MGMT_KEYS 2
  #define MAX_PN_LEN 16
  
  struct ieee80211_local;
  struct ieee80211_sub_if_data;
  struct sta_info;
  
  /**
   * enum ieee80211_internal_key_flags - internal key flags
   *
   * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
   *	in the hardware for TX crypto hardware acceleration.
   * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
   */
  enum ieee80211_internal_key_flags {
  	KEY_FLAG_UPLOADED_TO_HARDWARE	= BIT(0),
  	KEY_FLAG_TAINTED		= BIT(1),
  };
  
  enum ieee80211_internal_tkip_state {
  	TKIP_STATE_NOT_INIT,
  	TKIP_STATE_PHASE1_DONE,
  	TKIP_STATE_PHASE1_HW_UPLOADED,
  };
  
  struct tkip_ctx {
  	u32 iv32;	/* current iv32 */
  	u16 iv16;	/* current iv16 */
  	u16 p1k[5];	/* p1k cache */
  	u32 p1k_iv32;	/* iv32 for which p1k computed */
  	enum ieee80211_internal_tkip_state state;
  };
  
  struct ieee80211_key {
  	struct ieee80211_local *local;
  	struct ieee80211_sub_if_data *sdata;
  	struct sta_info *sta;
  
  	/* for sdata list */
  	struct list_head list;
  
  	/* protected by key mutex */
  	unsigned int flags;
  
  	union {
  		struct {
  			/* protects tx context */
  			spinlock_t txlock;
  
  			/* last used TSC */
  			struct tkip_ctx tx;
  
  			/* last received RSC */
  			struct tkip_ctx rx[IEEE80211_NUM_TIDS];
  
  			/* number of mic failures */
  			u32 mic_failures;
  		} tkip;
  		struct {
  			atomic64_t tx_pn;
  			/*
  			 * Last received packet number. The first
  			 * IEEE80211_NUM_TIDS counters are used with Data
  			 * frames and the last counter is used with Robust
  			 * Management frames.
  			 */
  			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
  			struct crypto_aead *tfm;
  			u32 replays; /* dot11RSNAStatsCCMPReplays */
  		} ccmp;
  		struct {
  			atomic64_t tx_pn;
  			u8 rx_pn[IEEE80211_CMAC_PN_LEN];
  			struct crypto_cipher *tfm;
  			u32 replays; /* dot11RSNAStatsCMACReplays */
  			u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
  		} aes_cmac;
  		struct {
  			/* generic cipher scheme */
  			u8 rx_pn[IEEE80211_NUM_TIDS + 1][MAX_PN_LEN];
  		} gen;
  	} u;
  
  	/* number of times this key has been used */
  	int tx_rx_count;
  
  #ifdef CONFIG_MAC80211_DEBUGFS
  	struct {
  		struct dentry *stalink;
  		struct dentry *dir;
  		int cnt;
  	} debugfs;
  #endif
  
  	/*
  	 * key config, must be last because it contains key
  	 * material as variable length member
  	 */
  	struct ieee80211_key_conf conf;
  };
  
  struct ieee80211_key *
  ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
  		    const u8 *key_data,
  		    size_t seq_len, const u8 *seq,
  		    const struct ieee80211_cipher_scheme *cs);
  /*
   * Insert a key into data structures (sdata, sta if necessary)
   * to make it used, free old key. On failure, also free the new key.
   */
  int ieee80211_key_link(struct ieee80211_key *key,
  		       struct ieee80211_sub_if_data *sdata,
  		       struct sta_info *sta);
  void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
  void ieee80211_key_free_unused(struct ieee80211_key *key);
  void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
  			       bool uni, bool multi);
  void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
  				    int idx);
  void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
  			 bool force_synchronize);
  void ieee80211_free_sta_keys(struct ieee80211_local *local,
  			     struct sta_info *sta);
  void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
  
  #define key_mtx_dereference(local, ref) \
  	rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
  
  void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
  
  #endif /* IEEE80211_KEY_H */