Release 4.15 net/mac80211/key.h

/*
 * 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

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.
 * @KEY_FLAG_CIPHER_SCHEME: This key is for a hardware cipher scheme
 */

enum ieee80211_internal_key_flags {
	
KEY_FLAG_UPLOADED_TO_HARDWARE	= BIT(0),
	
KEY_FLAG_TAINTED		= BIT(1),
	
KEY_FLAG_CIPHER_SCHEME		= BIT(2),
};


enum ieee80211_internal_tkip_state {
	
TKIP_STATE_NOT_INIT,
	
TKIP_STATE_PHASE1_DONE,
	
TKIP_STATE_PHASE1_HW_UPLOADED,
};


struct tkip_ctx {
	
u16 p1k[5];	/* p1k cache */
	
u32 p1k_iv32;	/* iv32 for which p1k computed */
	
enum ieee80211_internal_tkip_state state;
};


struct tkip_ctx_rx {
	
struct tkip_ctx ctx;
	
u32 iv32;	/* current iv32 */
	
u16 iv16;	/* current iv16 */
};


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 rx[IEEE80211_NUM_TIDS];

			/* number of mic failures */
			
u32 mic_failures;
		
} tkip;
		struct {
			/*
                         * 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 {
			
u8 rx_pn[IEEE80211_CMAC_PN_LEN];
			
struct crypto_shash *tfm;
			
u32 replays; /* dot11RSNAStatsCMACReplays */
			
u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
		
} aes_cmac;
		struct {
			
u8 rx_pn[IEEE80211_GMAC_PN_LEN];
			
struct crypto_aead *tfm;
			
u32 replays; /* dot11RSNAStatsCMACReplays */
			
u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
		
} aes_gmac;
		struct {
			/* 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_GCMP_PN_LEN];
			
struct crypto_aead *tfm;
			
u32 replays; /* dot11RSNAStatsGCMPReplays */
		
} gcmp;
		struct {
			/* generic cipher scheme */
			
u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_MAX_PN_LEN];
		
} gen;
	
} u;

#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);
void ieee80211_reset_crypto_tx_tailroom(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 */
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