net/mac80211/key.h

   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 enum ieee80211_internal_tkip_state {
  63         TKIP_STATE_NOT_INIT,
  64         TKIP_STATE_PHASE1_DONE,
  65         TKIP_STATE_PHASE1_HW_UPLOADED,
  66 };
  67
  68 struct tkip_ctx {
  69         u32 iv32;
  70         u16 iv16;
  71         u16 p1k[5];
  72         enum ieee80211_internal_tkip_state state;
  73 };
  74
  75 struct ieee80211_key {
  76         struct ieee80211_local *local;
  77         struct ieee80211_sub_if_data *sdata;
  78         struct sta_info *sta;
  79
  80         /* for sdata list */
  81         struct list_head list;
  82         /* for todo list */
  83         struct list_head todo;
  84
  85         /* protected by todo lock! */
  86         unsigned int flags;
  87
  88         union {
  89                 struct {
  90                         /* last used TSC */
  91                         struct tkip_ctx tx;
  92
  93                         /* last received RSC */
  94                         struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
  95                 } tkip;
  96                 struct {
  97                         u8 tx_pn[6];
  98                         u8 rx_pn[NUM_RX_DATA_QUEUES][6];
  99                         struct crypto_cipher *tfm;
 100                         u32 replays; /* dot11RSNAStatsCCMPReplays */
 101                         /* scratch buffers for virt_to_page() (crypto API) */
 102 #ifndef AES_BLOCK_LEN
 103 #define AES_BLOCK_LEN 16
 104 #endif
 105                         u8 tx_crypto_buf[6 * AES_BLOCK_LEN];
 106                         u8 rx_crypto_buf[6 * AES_BLOCK_LEN];
 107                 } ccmp;
 108                 struct {
 109                         u8 tx_pn[6];
 110                         u8 rx_pn[6];
 111                         struct crypto_cipher *tfm;
 112                         u32 replays; /* dot11RSNAStatsCMACReplays */
 113                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
 114                         /* scratch buffers for virt_to_page() (crypto API) */
 115                         u8 tx_crypto_buf[2 * AES_BLOCK_LEN];
 116                         u8 rx_crypto_buf[2 * AES_BLOCK_LEN];
 117                 } aes_cmac;
 118         } u;
 119
 120         /* number of times this key has been used */
 121         int tx_rx_count;
 122
 123 #ifdef CONFIG_MAC80211_DEBUGFS
 124         struct {
 125                 struct dentry *stalink;
 126                 struct dentry *dir;
 127                 int cnt;
 128         } debugfs;
 129 #endif
 130
 131         /*
 132          * key config, must be last because it contains key
 133          * material as variable length member
 134          */
 135         struct ieee80211_key_conf conf;
 136 };
 137
 138 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 139                                           int idx,
 140                                           size_t key_len,
 141                                           const u8 *key_data,
 142                                           size_t seq_len, const u8 *seq);
 143 /*
 144  * Insert a key into data structures (sdata, sta if necessary)
 145  * to make it used, free old key.
 146  */
 147 void ieee80211_key_link(struct ieee80211_key *key,
 148                         struct ieee80211_sub_if_data *sdata,
 149                         struct sta_info *sta);
 150 void ieee80211_key_free(struct ieee80211_key *key);
 151 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
 152 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 153                                     int idx);
 154 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 155 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 156 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
 157
 158 void ieee80211_key_todo(void);
 159
 160 #endif /* IEEE80211_KEY_H */