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 u16 p1k[5]; /* p1k cache */ 48 u32 p1k_iv32; /* iv32 for which p1k computed */ 49 enum ieee80211_internal_tkip_state state; 50 }; 51 52 struct tkip_ctx_rx { 53 struct tkip_ctx ctx; 54 u32 iv32; /* current iv32 */ 55 u16 iv16; /* current iv16 */ 56 }; 57 58 struct ieee80211_key { 59 struct ieee80211_local *local; 60 struct ieee80211_sub_if_data *sdata; 61 struct sta_info *sta; 62 63 /* for sdata list */ 64 struct list_head list; 65 66 /* protected by key mutex */ 67 unsigned int flags; 68 69 union { 70 struct { 71 /* protects tx context */ 72 spinlock_t txlock; 73 74 /* last used TSC */ 75 struct tkip_ctx tx; 76 77 /* last received RSC */ 78 struct tkip_ctx_rx rx[IEEE80211_NUM_TIDS]; 79 80 /* number of mic failures */ 81 u32 mic_failures; 82 } tkip; 83 struct { 84 /* 85 * Last received packet number. The first 86 * IEEE80211_NUM_TIDS counters are used with Data 87 * frames and the last counter is used with Robust 88 * Management frames. 89 */ 90 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN]; 91 struct crypto_aead *tfm; 92 u32 replays; /* dot11RSNAStatsCCMPReplays */ 93 } ccmp; 94 struct { 95 u8 rx_pn[IEEE80211_CMAC_PN_LEN]; 96 struct crypto_shash *tfm; 97 u32 replays; /* dot11RSNAStatsCMACReplays */ 98 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 99 } aes_cmac; 100 struct { 101 u8 rx_pn[IEEE80211_GMAC_PN_LEN]; 102 struct crypto_aead *tfm; 103 u32 replays; /* dot11RSNAStatsCMACReplays */ 104 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 105 } aes_gmac; 106 struct { 107 /* Last received packet number. The first 108 * IEEE80211_NUM_TIDS counters are used with Data 109 * frames and the last counter is used with Robust 110 * Management frames. 111 */ 112 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN]; 113 struct crypto_aead *tfm; 114 u32 replays; /* dot11RSNAStatsGCMPReplays */ 115 } gcmp; 116 struct { 117 /* generic cipher scheme */ 118 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_MAX_PN_LEN]; 119 } gen; 120 } u; 121 122 #ifdef CONFIG_MAC80211_DEBUGFS 123 struct { 124 struct dentry *stalink; 125 struct dentry *dir; 126 int cnt; 127 } debugfs; 128 #endif 129 130 /* 131 * key config, must be last because it contains key 132 * material as variable length member 133 */ 134 struct ieee80211_key_conf conf; 135 }; 136 137 struct ieee80211_key * 138 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 139 const u8 *key_data, 140 size_t seq_len, const u8 *seq, 141 const struct ieee80211_cipher_scheme *cs); 142 /* 143 * Insert a key into data structures (sdata, sta if necessary) 144 * to make it used, free old key. On failure, also free the new key. 145 */ 146 int ieee80211_key_link(struct ieee80211_key *key, 147 struct ieee80211_sub_if_data *sdata, 148 struct sta_info *sta); 149 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom); 150 void ieee80211_key_free_unused(struct ieee80211_key *key); 151 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 152 bool uni, bool multi); 153 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 154 int idx); 155 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata, 156 bool force_synchronize); 157 void ieee80211_free_sta_keys(struct ieee80211_local *local, 158 struct sta_info *sta); 159 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 160 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata); 161 162 #define key_mtx_dereference(local, ref) \ 163 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx))) 164 165 void ieee80211_delayed_tailroom_dec(struct work_struct *wk); 166 167 #endif /* IEEE80211_KEY_H */ 168