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 /* ALG_TKIP 20 * struct ieee80211_key::key is encoded as a 256-bit (32 byte) data block: 21 * Temporal Encryption Key (128 bits) 22 * Temporal Authenticator Tx MIC Key (64 bits) 23 * Temporal Authenticator Rx MIC Key (64 bits) 24 */ 25 26 #define WEP_IV_LEN 4 27 #define WEP_ICV_LEN 4 28 29 #define ALG_TKIP_KEY_LEN 32 30 /* Starting offsets for each key */ 31 #define ALG_TKIP_TEMP_ENCR_KEY 0 32 #define ALG_TKIP_TEMP_AUTH_TX_MIC_KEY 16 33 #define ALG_TKIP_TEMP_AUTH_RX_MIC_KEY 24 34 #define TKIP_IV_LEN 8 35 #define TKIP_ICV_LEN 4 36 37 #define ALG_CCMP_KEY_LEN 16 38 #define CCMP_HDR_LEN 8 39 #define CCMP_MIC_LEN 8 40 #define CCMP_TK_LEN 16 41 #define CCMP_PN_LEN 6 42 43 #define NUM_RX_DATA_QUEUES 17 44 45 struct ieee80211_local; 46 struct ieee80211_sub_if_data; 47 struct sta_info; 48 49 /** 50 * enum ieee80211_internal_key_flags - internal key flags 51 * 52 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present 53 * in the hardware for TX crypto hardware acceleration. 54 * @KEY_FLAG_TODO_DELETE: Key is marked for deletion and will, after an 55 * RCU grace period, no longer be reachable other than from the 56 * todo list. 57 * @KEY_FLAG_TODO_HWACCEL_ADD: Key needs to be added to hardware acceleration. 58 * @KEY_FLAG_TODO_HWACCEL_REMOVE: Key needs to be removed from hardware 59 * acceleration. 60 * @KEY_FLAG_TODO_DEFKEY: Key is default key and debugfs needs to be updated. 61 * @KEY_FLAG_TODO_ADD_DEBUGFS: Key needs to be added to debugfs. 62 */ 63 enum ieee80211_internal_key_flags { 64 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 65 KEY_FLAG_TODO_DELETE = BIT(1), 66 KEY_FLAG_TODO_HWACCEL_ADD = BIT(2), 67 KEY_FLAG_TODO_HWACCEL_REMOVE = BIT(3), 68 KEY_FLAG_TODO_DEFKEY = BIT(4), 69 KEY_FLAG_TODO_ADD_DEBUGFS = BIT(5), 70 }; 71 72 struct ieee80211_key { 73 struct ieee80211_local *local; 74 struct ieee80211_sub_if_data *sdata; 75 struct sta_info *sta; 76 77 /* for sdata list */ 78 struct list_head list; 79 /* for todo list */ 80 struct list_head todo; 81 82 /* protected by todo lock! */ 83 unsigned int flags; 84 85 union { 86 struct { 87 /* last used TSC */ 88 u32 iv32; 89 u16 iv16; 90 u16 p1k[5]; 91 int tx_initialized; 92 93 /* last received RSC */ 94 u32 iv32_rx[NUM_RX_DATA_QUEUES]; 95 u16 iv16_rx[NUM_RX_DATA_QUEUES]; 96 u16 p1k_rx[NUM_RX_DATA_QUEUES][5]; 97 int rx_initialized[NUM_RX_DATA_QUEUES]; 98 } tkip; 99 struct { 100 u8 tx_pn[6]; 101 u8 rx_pn[NUM_RX_DATA_QUEUES][6]; 102 struct crypto_cipher *tfm; 103 u32 replays; /* dot11RSNAStatsCCMPReplays */ 104 /* scratch buffers for virt_to_page() (crypto API) */ 105 #ifndef AES_BLOCK_LEN 106 #define AES_BLOCK_LEN 16 107 #endif 108 u8 tx_crypto_buf[6 * AES_BLOCK_LEN]; 109 u8 rx_crypto_buf[6 * AES_BLOCK_LEN]; 110 } ccmp; 111 } u; 112 113 /* number of times this key has been used */ 114 int tx_rx_count; 115 116 #ifdef CONFIG_MAC80211_DEBUGFS 117 struct { 118 struct dentry *stalink; 119 struct dentry *dir; 120 struct dentry *keylen; 121 struct dentry *flags; 122 struct dentry *keyidx; 123 struct dentry *hw_key_idx; 124 struct dentry *tx_rx_count; 125 struct dentry *algorithm; 126 struct dentry *tx_spec; 127 struct dentry *rx_spec; 128 struct dentry *replays; 129 struct dentry *key; 130 struct dentry *ifindex; 131 int cnt; 132 } debugfs; 133 #endif 134 135 /* 136 * key config, must be last because it contains key 137 * material as variable length member 138 */ 139 struct ieee80211_key_conf conf; 140 }; 141 142 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg, 143 int idx, 144 size_t key_len, 145 const u8 *key_data); 146 /* 147 * Insert a key into data structures (sdata, sta if necessary) 148 * to make it used, free old key. 149 */ 150 void ieee80211_key_link(struct ieee80211_key *key, 151 struct ieee80211_sub_if_data *sdata, 152 struct sta_info *sta); 153 void ieee80211_key_free(struct ieee80211_key *key); 154 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx); 155 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata); 156 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 157 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata); 158 159 void ieee80211_key_todo(void); 160 161 #endif /* IEEE80211_KEY_H */ 162