/*
   * 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 WEP_IV_LEN		4
  #define WEP_ICV_LEN		4

  #define ALG_CCMP_KEY_LEN	16
  #define CCMP_HDR_LEN		8
  #define CCMP_MIC_LEN		8
  #define CCMP_TK_LEN		16
  #define CCMP_PN_LEN		6
  #define TKIP_IV_LEN		8
  #define TKIP_ICV_LEN		4

  #define CMAC_PN_LEN		6

  #define NUM_RX_DATA_QUEUES	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[NUM_RX_DATA_QUEUES];

  		} tkip;
  		struct {

  			atomic64_t tx_pn;

  			/*
  			 * Last received packet number. The first
  			 * NUM_RX_DATA_QUEUES counters are used with Data
  			 * frames and the last counter is used with Robust
  			 * Management frames.
  			 */

  			u8 rx_pn[NUM_RX_DATA_QUEUES + 1][CCMP_PN_LEN];

  			struct crypto_cipher *tfm;
  			u32 replays; /* dot11RSNAStatsCCMPReplays */

  		} ccmp;

  		struct {

  			atomic64_t tx_pn;

  			u8 rx_pn[CMAC_PN_LEN];

  			struct crypto_cipher *tfm;
  			u32 replays; /* dot11RSNAStatsCMACReplays */
  			u32 icverrors; /* dot11RSNAStatsCMACICVErrors */

  		} aes_cmac;

  	} 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);

  /*
   * Insert a key into data structures (sdata, sta if necessary)
   * to make it used, free old key.
   */

  int __must_check 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);

  void ieee80211_key_free(struct ieee80211_local *local,
  			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);
  void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
  void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);

  #define key_mtx_dereference(local, ref) \
  	rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))

  #endif /* IEEE80211_KEY_H */