key.h 3.92 KB
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/*
 * 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>
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#include <linux/list.h>
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#include <linux/crypto.h>
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#include <linux/rcupdate.h>
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#include <net/mac80211.h>

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#define NUM_DEFAULT_KEYS 4
#define NUM_DEFAULT_MGMT_KEYS 2
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#define MAX_PN_LEN 16
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struct ieee80211_local;
struct ieee80211_sub_if_data;
struct sta_info;

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/**
 * 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.
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 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
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 */
enum ieee80211_internal_key_flags {
	KEY_FLAG_UPLOADED_TO_HARDWARE	= BIT(0),
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	KEY_FLAG_TAINTED		= BIT(1),
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};
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enum ieee80211_internal_tkip_state {
	TKIP_STATE_NOT_INIT,
	TKIP_STATE_PHASE1_DONE,
	TKIP_STATE_PHASE1_HW_UPLOADED,
};

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struct tkip_ctx {
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	u32 iv32;	/* current iv32 */
	u16 iv16;	/* current iv16 */
	u16 p1k[5];	/* p1k cache */
	u32 p1k_iv32;	/* iv32 for which p1k computed */
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	enum ieee80211_internal_tkip_state state;
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};

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struct ieee80211_key {
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	struct ieee80211_local *local;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;

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	/* for sdata list */
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	struct list_head list;

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	/* protected by key mutex */
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	unsigned int flags;

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	union {
		struct {
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			/* protects tx context */
			spinlock_t txlock;

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			/* last used TSC */
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			struct tkip_ctx tx;
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			/* last received RSC */
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			struct tkip_ctx rx[IEEE80211_NUM_TIDS];
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			/* number of mic failures */
			u32 mic_failures;
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		} tkip;
		struct {
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			atomic64_t tx_pn;
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			/*
			 * Last received packet number. The first
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			 * IEEE80211_NUM_TIDS counters are used with Data
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			 * frames and the last counter is used with Robust
			 * Management frames.
			 */
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			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
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			struct crypto_aead *tfm;
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			u32 replays; /* dot11RSNAStatsCCMPReplays */
		} ccmp;
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		struct {
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			atomic64_t tx_pn;
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			u8 rx_pn[IEEE80211_CMAC_PN_LEN];
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			struct crypto_cipher *tfm;
			u32 replays; /* dot11RSNAStatsCMACReplays */
			u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
		} aes_cmac;
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		struct {
			/* generic cipher scheme */
			u8 rx_pn[IEEE80211_NUM_TIDS + 1][MAX_PN_LEN];
		} gen;
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	} u;

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	/* number of times this key has been used */
	int tx_rx_count;
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#ifdef CONFIG_MAC80211_DEBUGFS
	struct {
		struct dentry *stalink;
		struct dentry *dir;
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		int cnt;
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	} debugfs;
#endif

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	/*
	 * key config, must be last because it contains key
	 * material as variable length member
	 */
	struct ieee80211_key_conf conf;
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};

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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);
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/*
 * Insert a key into data structures (sdata, sta if necessary)
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 * to make it used, free old key. On failure, also free the new key.
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 */
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int ieee80211_key_link(struct ieee80211_key *key,
		       struct ieee80211_sub_if_data *sdata,
		       struct sta_info *sta);
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void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
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void ieee80211_key_free_unused(struct ieee80211_key *key);
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void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
			       bool uni, bool multi);
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void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
				    int idx);
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void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
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void ieee80211_free_sta_keys(struct ieee80211_local *local,
			     struct sta_info *sta);
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void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);

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

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void ieee80211_delayed_tailroom_dec(struct work_struct *wk);

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#endif /* IEEE80211_KEY_H */