151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*
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* Copyright 2002-2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef IEEE80211_KEY_H
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#define IEEE80211_KEY_H
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#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
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#define NUM_DEFAULT_MGMT_KEYS 2
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#define MAX_PN_LEN 16
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struct ieee80211_local;
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struct ieee80211_sub_if_data;
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struct sta_info;
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/**
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* enum ieee80211_internal_key_flags - internal key flags
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*
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* @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
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* 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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*/
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enum ieee80211_internal_key_flags {
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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 {
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TKIP_STATE_NOT_INIT,
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TKIP_STATE_PHASE1_DONE,
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TKIP_STATE_PHASE1_HW_UPLOADED,
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};
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struct tkip_ctx {
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u32 iv32; /* current iv32 */
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u16 iv16; /* current iv16 */
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u16 p1k[5]; /* p1k cache */
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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;
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struct ieee80211_sub_if_data *sdata;
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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 {
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struct {
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/* protects tx context */
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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 */
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u32 mic_failures;
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} tkip;
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struct {
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atomic64_t tx_pn;
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/*
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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
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* Management frames.
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*/
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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 */
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} 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;
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u32 replays; /* dot11RSNAStatsCMACReplays */
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u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
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} aes_cmac;
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struct {
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/* generic cipher scheme */
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u8 rx_pn[IEEE80211_NUM_TIDS + 1][MAX_PN_LEN];
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} gen;
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} u;
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/* number of times this key has been used */
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int tx_rx_count;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct {
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struct dentry *stalink;
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struct dentry *dir;
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int cnt;
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} debugfs;
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#endif
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/*
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* key config, must be last because it contains key
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* material as variable length member
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*/
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struct ieee80211_key_conf conf;
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};
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struct ieee80211_key *
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ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
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const u8 *key_data,
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size_t seq_len, const u8 *seq,
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const struct ieee80211_cipher_scheme *cs);
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/*
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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,
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struct ieee80211_sub_if_data *sdata,
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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,
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bool uni, bool multi);
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void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
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int idx);
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void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
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bool force_synchronize);
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void ieee80211_free_sta_keys(struct ieee80211_local *local,
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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) \
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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 */
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