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 #define WEP_IV_LEN 4 23 #define WEP_ICV_LEN 4 24 #define ALG_CCMP_KEY_LEN 16 25 #define CCMP_HDR_LEN 8 26 #define CCMP_MIC_LEN 8 27 #define CCMP_TK_LEN 16 28 #define CCMP_PN_LEN 6 29 #define TKIP_IV_LEN 8 30 #define TKIP_ICV_LEN 4 31 #define CMAC_PN_LEN 6 32 33 #define NUM_RX_DATA_QUEUES 16 34 35 struct ieee80211_local; 36 struct ieee80211_sub_if_data; 37 struct sta_info; 38 39 /** 40 * enum ieee80211_internal_key_flags - internal key flags 41 * 42 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present 43 * in the hardware for TX crypto hardware acceleration. 44 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped. 45 */ 46 enum ieee80211_internal_key_flags { 47 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 48 KEY_FLAG_TAINTED = BIT(1), 49 }; 50 51 enum ieee80211_internal_tkip_state { 52 TKIP_STATE_NOT_INIT, 53 TKIP_STATE_PHASE1_DONE, 54 TKIP_STATE_PHASE1_HW_UPLOADED, 55 }; 56 57 struct tkip_ctx { 58 u32 iv32; /* current iv32 */ 59 u16 iv16; /* current iv16 */ 60 u16 p1k[5]; /* p1k cache */ 61 u32 p1k_iv32; /* iv32 for which p1k computed */ 62 enum ieee80211_internal_tkip_state state; 63 }; 64 65 struct ieee80211_key { 66 struct ieee80211_local *local; 67 struct ieee80211_sub_if_data *sdata; 68 struct sta_info *sta; 69 70 /* for sdata list */ 71 struct list_head list; 72 73 /* protected by key mutex */ 74 unsigned int flags; 75 76 union { 77 struct { 78 /* protects tx context */ 79 spinlock_t txlock; 80 81 /* last used TSC */ 82 struct tkip_ctx tx; 83 84 /* last received RSC */ 85 struct tkip_ctx rx[NUM_RX_DATA_QUEUES]; 86 } tkip; 87 struct { 88 atomic64_t tx_pn; 89 /* 90 * Last received packet number. The first 91 * NUM_RX_DATA_QUEUES counters are used with Data 92 * frames and the last counter is used with Robust 93 * Management frames. 94 */ 95 u8 rx_pn[NUM_RX_DATA_QUEUES + 1][CCMP_PN_LEN]; 96 struct crypto_cipher *tfm; 97 u32 replays; /* dot11RSNAStatsCCMPReplays */ 98 } ccmp; 99 struct { 100 atomic64_t tx_pn; 101 u8 rx_pn[CMAC_PN_LEN]; 102 struct crypto_cipher *tfm; 103 u32 replays; /* dot11RSNAStatsCMACReplays */ 104 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 105 } aes_cmac; 106 } u; 107 108 /* number of times this key has been used */ 109 int tx_rx_count; 110 111 #ifdef CONFIG_MAC80211_DEBUGFS 112 struct { 113 struct dentry *stalink; 114 struct dentry *dir; 115 int cnt; 116 } debugfs; 117 #endif 118 119 /* 120 * key config, must be last because it contains key 121 * material as variable length member 122 */ 123 struct ieee80211_key_conf conf; 124 }; 125 126 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 127 const u8 *key_data, 128 size_t seq_len, const u8 *seq); 129 /* 130 * Insert a key into data structures (sdata, sta if necessary) 131 * to make it used, free old key. 132 */ 133 int __must_check ieee80211_key_link(struct ieee80211_key *key, 134 struct ieee80211_sub_if_data *sdata, 135 struct sta_info *sta); 136 void __ieee80211_key_free(struct ieee80211_key *key); 137 void ieee80211_key_free(struct ieee80211_local *local, 138 struct ieee80211_key *key); 139 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, 140 bool uni, bool multi); 141 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 142 int idx); 143 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata); 144 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 145 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata); 146 147 #define key_mtx_dereference(local, ref) \ 148 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx))) 149 150 #endif /* IEEE80211_KEY_H */ 151