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 WEP_IV_LEN 4 20 #define WEP_ICV_LEN 4 21 #define ALG_TKIP_KEY_LEN 32 22 #define ALG_CCMP_KEY_LEN 16 23 #define CCMP_HDR_LEN 8 24 #define CCMP_MIC_LEN 8 25 #define CCMP_TK_LEN 16 26 #define CCMP_PN_LEN 6 27 #define TKIP_IV_LEN 8 28 #define TKIP_ICV_LEN 4 29 30 #define NUM_RX_DATA_QUEUES 17 31 32 struct ieee80211_local; 33 struct ieee80211_sub_if_data; 34 struct sta_info; 35 36 /** 37 * enum ieee80211_internal_key_flags - internal key flags 38 * 39 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present 40 * in the hardware for TX crypto hardware acceleration. 41 * @KEY_FLAG_TODO_DELETE: Key is marked for deletion and will, after an 42 * RCU grace period, no longer be reachable other than from the 43 * todo list. 44 * @KEY_FLAG_TODO_HWACCEL_ADD: Key needs to be added to hardware acceleration. 45 * @KEY_FLAG_TODO_HWACCEL_REMOVE: Key needs to be removed from hardware 46 * acceleration. 47 * @KEY_FLAG_TODO_DEFKEY: Key is default key and debugfs needs to be updated. 48 * @KEY_FLAG_TODO_ADD_DEBUGFS: Key needs to be added to debugfs. 49 * @KEY_FLAG_TODO_DEFMGMTKEY: Key is default management key and debugfs needs 50 * to be updated. 51 */ 52 enum ieee80211_internal_key_flags { 53 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 54 KEY_FLAG_TODO_DELETE = BIT(1), 55 KEY_FLAG_TODO_HWACCEL_ADD = BIT(2), 56 KEY_FLAG_TODO_HWACCEL_REMOVE = BIT(3), 57 KEY_FLAG_TODO_DEFKEY = BIT(4), 58 KEY_FLAG_TODO_ADD_DEBUGFS = BIT(5), 59 KEY_FLAG_TODO_DEFMGMTKEY = BIT(6), 60 }; 61 62 struct tkip_ctx { 63 u32 iv32; 64 u16 iv16; 65 u16 p1k[5]; 66 int initialized; 67 }; 68 69 struct ieee80211_key { 70 struct ieee80211_local *local; 71 struct ieee80211_sub_if_data *sdata; 72 struct sta_info *sta; 73 74 /* for sdata list */ 75 struct list_head list; 76 /* for todo list */ 77 struct list_head todo; 78 79 /* protected by todo lock! */ 80 unsigned int flags; 81 82 union { 83 struct { 84 /* last used TSC */ 85 struct tkip_ctx tx; 86 87 /* last received RSC */ 88 struct tkip_ctx rx[NUM_RX_DATA_QUEUES]; 89 } tkip; 90 struct { 91 u8 tx_pn[6]; 92 u8 rx_pn[NUM_RX_DATA_QUEUES][6]; 93 struct crypto_cipher *tfm; 94 u32 replays; /* dot11RSNAStatsCCMPReplays */ 95 /* scratch buffers for virt_to_page() (crypto API) */ 96 #ifndef AES_BLOCK_LEN 97 #define AES_BLOCK_LEN 16 98 #endif 99 u8 tx_crypto_buf[6 * AES_BLOCK_LEN]; 100 u8 rx_crypto_buf[6 * AES_BLOCK_LEN]; 101 } ccmp; 102 struct { 103 u8 tx_pn[6]; 104 u8 rx_pn[6]; 105 struct crypto_cipher *tfm; 106 u32 replays; /* dot11RSNAStatsCMACReplays */ 107 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 108 /* scratch buffers for virt_to_page() (crypto API) */ 109 u8 tx_crypto_buf[2 * AES_BLOCK_LEN]; 110 u8 rx_crypto_buf[2 * AES_BLOCK_LEN]; 111 } aes_cmac; 112 } u; 113 114 /* number of times this key has been used */ 115 int tx_rx_count; 116 117 #ifdef CONFIG_MAC80211_DEBUGFS 118 struct { 119 struct dentry *stalink; 120 struct dentry *dir; 121 struct dentry *keylen; 122 struct dentry *flags; 123 struct dentry *keyidx; 124 struct dentry *hw_key_idx; 125 struct dentry *tx_rx_count; 126 struct dentry *algorithm; 127 struct dentry *tx_spec; 128 struct dentry *rx_spec; 129 struct dentry *replays; 130 struct dentry *icverrors; 131 struct dentry *key; 132 struct dentry *ifindex; 133 int cnt; 134 } debugfs; 135 #endif 136 137 /* 138 * key config, must be last because it contains key 139 * material as variable length member 140 */ 141 struct ieee80211_key_conf conf; 142 }; 143 144 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg, 145 int idx, 146 size_t key_len, 147 const u8 *key_data, 148 size_t seq_len, const u8 *seq); 149 /* 150 * Insert a key into data structures (sdata, sta if necessary) 151 * to make it used, free old key. 152 */ 153 void ieee80211_key_link(struct ieee80211_key *key, 154 struct ieee80211_sub_if_data *sdata, 155 struct sta_info *sta); 156 void ieee80211_key_free(struct ieee80211_key *key); 157 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx); 158 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 159 int idx); 160 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata); 161 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 162 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata); 163 164 void ieee80211_key_todo(void); 165 166 #endif /* IEEE80211_KEY_H */ 167