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 */ 50 enum ieee80211_internal_key_flags { 51 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 52 KEY_FLAG_TODO_DELETE = BIT(1), 53 KEY_FLAG_TODO_HWACCEL_ADD = BIT(2), 54 KEY_FLAG_TODO_HWACCEL_REMOVE = BIT(3), 55 KEY_FLAG_TODO_DEFKEY = BIT(4), 56 KEY_FLAG_TODO_ADD_DEBUGFS = BIT(5), 57 }; 58 59 struct tkip_ctx { 60 u32 iv32; 61 u16 iv16; 62 u16 p1k[5]; 63 int initialized; 64 }; 65 66 struct ieee80211_key { 67 struct ieee80211_local *local; 68 struct ieee80211_sub_if_data *sdata; 69 struct sta_info *sta; 70 71 /* for sdata list */ 72 struct list_head list; 73 /* for todo list */ 74 struct list_head todo; 75 76 /* protected by todo lock! */ 77 unsigned int flags; 78 79 union { 80 struct { 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 u8 tx_pn[6]; 89 u8 rx_pn[NUM_RX_DATA_QUEUES][6]; 90 struct crypto_cipher *tfm; 91 u32 replays; /* dot11RSNAStatsCCMPReplays */ 92 /* scratch buffers for virt_to_page() (crypto API) */ 93 #ifndef AES_BLOCK_LEN 94 #define AES_BLOCK_LEN 16 95 #endif 96 u8 tx_crypto_buf[6 * AES_BLOCK_LEN]; 97 u8 rx_crypto_buf[6 * AES_BLOCK_LEN]; 98 } ccmp; 99 } u; 100 101 /* number of times this key has been used */ 102 int tx_rx_count; 103 104 #ifdef CONFIG_MAC80211_DEBUGFS 105 struct { 106 struct dentry *stalink; 107 struct dentry *dir; 108 struct dentry *keylen; 109 struct dentry *flags; 110 struct dentry *keyidx; 111 struct dentry *hw_key_idx; 112 struct dentry *tx_rx_count; 113 struct dentry *algorithm; 114 struct dentry *tx_spec; 115 struct dentry *rx_spec; 116 struct dentry *replays; 117 struct dentry *key; 118 struct dentry *ifindex; 119 int cnt; 120 } debugfs; 121 #endif 122 123 /* 124 * key config, must be last because it contains key 125 * material as variable length member 126 */ 127 struct ieee80211_key_conf conf; 128 }; 129 130 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg, 131 int idx, 132 size_t key_len, 133 const u8 *key_data); 134 /* 135 * Insert a key into data structures (sdata, sta if necessary) 136 * to make it used, free old key. 137 */ 138 void ieee80211_key_link(struct ieee80211_key *key, 139 struct ieee80211_sub_if_data *sdata, 140 struct sta_info *sta); 141 void ieee80211_key_free(struct ieee80211_key *key); 142 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, 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 void ieee80211_key_todo(void); 148 149 #endif /* IEEE80211_KEY_H */ 150