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  */
  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 */