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_TKIP_KEY_LEN 32 25 #define ALG_CCMP_KEY_LEN 16 26 #define CCMP_HDR_LEN 8 27 #define CCMP_MIC_LEN 8 28 #define CCMP_TK_LEN 16 29 #define CCMP_PN_LEN 6 30 #define TKIP_IV_LEN 8 31 #define TKIP_ICV_LEN 4 32 33 #define NUM_RX_DATA_QUEUES 17 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 */ 45 enum ieee80211_internal_key_flags { 46 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), 47 }; 48 49 enum ieee80211_internal_tkip_state { 50 TKIP_STATE_NOT_INIT, 51 TKIP_STATE_PHASE1_DONE, 52 TKIP_STATE_PHASE1_HW_UPLOADED, 53 }; 54 55 struct tkip_ctx { 56 u32 iv32; 57 u16 iv16; 58 u16 p1k[5]; 59 enum ieee80211_internal_tkip_state state; 60 }; 61 62 struct ieee80211_key { 63 struct ieee80211_local *local; 64 struct ieee80211_sub_if_data *sdata; 65 struct sta_info *sta; 66 67 /* for sdata list */ 68 struct list_head list; 69 70 /* protected by key mutex */ 71 unsigned int flags; 72 73 union { 74 struct { 75 /* last used TSC */ 76 struct tkip_ctx tx; 77 78 /* last received RSC */ 79 struct tkip_ctx rx[NUM_RX_DATA_QUEUES]; 80 } tkip; 81 struct { 82 u8 tx_pn[6]; 83 /* 84 * Last received packet number. The first 85 * NUM_RX_DATA_QUEUES counters are used with Data 86 * frames and the last counter is used with Robust 87 * Management frames. 88 */ 89 u8 rx_pn[NUM_RX_DATA_QUEUES + 1][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 struct { 100 u8 tx_pn[6]; 101 u8 rx_pn[6]; 102 struct crypto_cipher *tfm; 103 u32 replays; /* dot11RSNAStatsCMACReplays */ 104 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ 105 /* scratch buffers for virt_to_page() (crypto API) */ 106 u8 tx_crypto_buf[2 * AES_BLOCK_LEN]; 107 u8 rx_crypto_buf[2 * AES_BLOCK_LEN]; 108 } aes_cmac; 109 } u; 110 111 /* number of times this key has been used */ 112 int tx_rx_count; 113 114 #ifdef CONFIG_MAC80211_DEBUGFS 115 struct { 116 struct dentry *stalink; 117 struct dentry *dir; 118 int cnt; 119 } debugfs; 120 #endif 121 122 /* 123 * key config, must be last because it contains key 124 * material as variable length member 125 */ 126 struct ieee80211_key_conf conf; 127 }; 128 129 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, 130 const u8 *key_data, 131 size_t seq_len, const u8 *seq); 132 /* 133 * Insert a key into data structures (sdata, sta if necessary) 134 * to make it used, free old key. 135 */ 136 int __must_check ieee80211_key_link(struct ieee80211_key *key, 137 struct ieee80211_sub_if_data *sdata, 138 struct sta_info *sta); 139 void ieee80211_key_free(struct ieee80211_local *local, 140 struct ieee80211_key *key); 141 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx); 142 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, 143 int idx); 144 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata); 145 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); 146 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata); 147 148 #endif /* IEEE80211_KEY_H */ 149