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 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                 int cnt;
 122         } debugfs;
 123 #endif
 124
 125         /*
 126          * key config, must be last because it contains key
 127          * material as variable length member
 128          */
 129         struct ieee80211_key_conf conf;
 130 };
 131
 132 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 133                                           int idx,
 134                                           size_t key_len,
 135                                           const u8 *key_data,
 136                                           size_t seq_len, const u8 *seq);
 137 /*
 138  * Insert a key into data structures (sdata, sta if necessary)
 139  * to make it used, free old key.
 140  */
 141 void ieee80211_key_link(struct ieee80211_key *key,
 142                         struct ieee80211_sub_if_data *sdata,
 143                         struct sta_info *sta);
 144 void ieee80211_key_free(struct ieee80211_key *key);
 145 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
 146 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 147                                     int idx);
 148 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 149 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 150 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
 151
 152 void ieee80211_key_todo(void);
 153
 154 #endif /* IEEE80211_KEY_H */