1 /* 2 * Copyright 2002-2004, Instant802 Networks, Inc. 3 * Copyright 2005, Devicescape Software, Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #ifndef IEEE80211_KEY_H 11 #define IEEE80211_KEY_H 12 13 #include <linux/types.h> 14 #include <linux/list.h> 15 #include <linux/crypto.h> 16 #include <linux/rcupdate.h> 17 #include <net/mac80211.h> 18 19 #define NUM_DEFAULT_KEYS 4 20 #define NUM_DEFAULT_MGMT_KEYS 2 21 22 struct ieee80211_local; 23 struct ieee80211_sub_if_data; 24 struct sta_info; 25 26 /** 27 * enum ieee80211_internal_key_flags - internal key flags 28 * 29 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present 30 * in the hardware for TX crypto hardware acceleration. 31 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped. 32 * @KEY_FLAG_CIPHER_SCHEME: This key is for a hardware cipher scheme 33 */ 34 enum ieee80211_internal_key_flags { 35 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 36 KEY_FLAG_TAINTED = BIT(1), 37 KEY_FLAG_CIPHER_SCHEME = BIT(2), 38 }; 39 40 enum ieee80211_internal_tkip_state { 41 TKIP_STATE_NOT_INIT, 42 TKIP_STATE_PHASE1_DONE, 43 TKIP_STATE_PHASE1_HW_UPLOADED, 44 }; 45 46 struct tkip_ctx { 47 u32 iv32; /* current iv32 */ 48 u16 iv16; /* current iv16 */ 49 u16 p1k[5]; /* p1k cache */ 50 u32 p1k_iv32; /* iv32 for which p1k computed */ 51 enum ieee80211_internal_tkip_state state; 52 }; 53 54 struct ieee80211_key { 55 struct ieee80211_local *local; 56 struct ieee80211_sub_if_data *sdata; 57 struct sta_info *sta; 58 59 /* for sdata list */ 60 struct list_head list; 61 62 /* protected by key mutex */ 63 unsigned int flags; 64 65 union { 66 struct { 67 /* protects tx context */ 68 spinlock_t txlock; 69 70 /* last used TSC */ 71 struct tkip_ctx tx; 72 73 /* last received RSC */ 74 struct tkip_ctx rx[IEEE80211_NUM_TIDS]; 75 76 /* number of mic failures */ 77 u32 mic_failures; 78 } tkip; 79 struct { 80 /* 81 * Last received packet number. The first 82 * IEEE80211_NUM_TIDS counters are used with Data 83 * frames and the last counter is used with Robust 84 * Management frames. 85 */ 86 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN]; 87 struct crypto_aead *tfm; 88 u32 replays; /* dot11RSNAStatsCCMPReplays */ 89 } ccmp; 90 struct { 91 u8 rx_pn[IEEE80211_CMAC_PN_LEN]; 92 struct crypto_cipher *tfm; 93 u32 replays; /* dot11RSNAStatsCMACReplays */ 94 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 95 } aes_cmac; 96 struct { 97 u8 rx_pn[IEEE80211_GMAC_PN_LEN]; 98 struct crypto_aead *tfm; 99 u32 replays; /* dot11RSNAStatsCMACReplays */ 100 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 101 } aes_gmac; 102 struct { 103 /* Last received packet number. The first 104 * IEEE80211_NUM_TIDS counters are used with Data 105 * frames and the last counter is used with Robust 106 * Management frames. 107 */ 108 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN]; 109 struct crypto_aead *tfm; 110 u32 replays; /* dot11RSNAStatsGCMPReplays */ 111 } gcmp; 112 struct { 113 /* generic cipher scheme */ 114 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_MAX_PN_LEN]; 115 } gen; 116 } u; 117 118 #ifdef CONFIG_MAC80211_DEBUGFS 119 struct { 120 struct dentry *stalink; 121 struct dentry *dir; 122 int cnt; 123 } debugfs; 124 #endif 125 126 /* 127 * key config, must be last because it contains key 128 * material as variable length member 129 */ 130 struct ieee80211_key_conf conf; 131 }; 132 133 struct ieee80211_key * 134 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 135 const u8 *key_data, 136 size_t seq_len, const u8 *seq, 137 const struct ieee80211_cipher_scheme *cs); 138 /* 139 * Insert a key into data structures (sdata, sta if necessary) 140 * to make it used, free old key. On failure, also free the new key. 141 */ 142 int ieee80211_key_link(struct ieee80211_key *key, 143 struct ieee80211_sub_if_data *sdata, 144 struct sta_info *sta); 145 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom); 146 void ieee80211_key_free_unused(struct ieee80211_key *key); 147 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 148 bool uni, bool multi); 149 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 150 int idx); 151 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 152 bool force_synchronize); 153 void ieee80211_free_sta_keys(struct ieee80211_local *local, 154 struct sta_info *sta); 155 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 156 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata); 157 158 #define key_mtx_dereference(local, ref) \ 159 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx))) 160 161 void ieee80211_delayed_tailroom_dec(struct work_struct *wk); 162 163 #endif /* IEEE80211_KEY_H */ 164