net/mac80211/ieee80211_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 <net/mac80211.h>
  17
  18 /* ALG_TKIP
  19  * struct ieee80211_key::key is encoded as a 256-bit (32 byte) data block:
  20  * Temporal Encryption Key (128 bits)
  21  * Temporal Authenticator Tx MIC Key (64 bits)
  22  * Temporal Authenticator Rx MIC Key (64 bits)
  23  */
  24
  25 #define WEP_IV_LEN 4
  26 #define WEP_ICV_LEN 4
  27
  28 #define ALG_TKIP_KEY_LEN 32
  29 /* Starting offsets for each key */
  30 #define ALG_TKIP_TEMP_ENCR_KEY 0
  31 #define ALG_TKIP_TEMP_AUTH_TX_MIC_KEY 16
  32 #define ALG_TKIP_TEMP_AUTH_RX_MIC_KEY 24
  33 #define TKIP_IV_LEN 8
  34 #define TKIP_ICV_LEN 4
  35
  36 #define ALG_CCMP_KEY_LEN 16
  37 #define CCMP_HDR_LEN 8
  38 #define CCMP_MIC_LEN 8
  39 #define CCMP_TK_LEN 16
  40 #define CCMP_PN_LEN 6
  41
  42 #define NUM_RX_DATA_QUEUES 17
  43
  44 struct ieee80211_local;
  45 struct ieee80211_sub_if_data;
  46 struct sta_info;
  47
  48 #define KEY_FLAG_UPLOADED_TO_HARDWARE   (1<<0)
  49
  50 struct ieee80211_key {
  51         struct ieee80211_local *local;
  52         struct ieee80211_sub_if_data *sdata;
  53         struct sta_info *sta;
  54
  55         struct list_head list;
  56
  57         unsigned int flags;
  58
  59         union {
  60                 struct {
  61                         /* last used TSC */
  62                         u32 iv32;
  63                         u16 iv16;
  64                         u16 p1k[5];
  65                         int tx_initialized;
  66
  67                         /* last received RSC */
  68                         u32 iv32_rx[NUM_RX_DATA_QUEUES];
  69                         u16 iv16_rx[NUM_RX_DATA_QUEUES];
  70                         u16 p1k_rx[NUM_RX_DATA_QUEUES][5];
  71                         int rx_initialized[NUM_RX_DATA_QUEUES];
  72                 } tkip;
  73                 struct {
  74                         u8 tx_pn[6];
  75                         u8 rx_pn[NUM_RX_DATA_QUEUES][6];
  76                         struct crypto_cipher *tfm;
  77                         u32 replays; /* dot11RSNAStatsCCMPReplays */
  78                         /* scratch buffers for virt_to_page() (crypto API) */
  79 #ifndef AES_BLOCK_LEN
  80 #define AES_BLOCK_LEN 16
  81 #endif
  82                         u8 tx_crypto_buf[6 * AES_BLOCK_LEN];
  83                         u8 rx_crypto_buf[6 * AES_BLOCK_LEN];
  84                 } ccmp;
  85         } u;
  86
  87         /* number of times this key has been used */
  88         int tx_rx_count;
  89
  90 #ifdef CONFIG_MAC80211_DEBUGFS
  91         struct {
  92                 struct dentry *stalink;
  93                 struct dentry *dir;
  94                 struct dentry *keylen;
  95                 struct dentry *flags;
  96                 struct dentry *keyidx;
  97                 struct dentry *hw_key_idx;
  98                 struct dentry *tx_rx_count;
  99                 struct dentry *algorithm;
 100                 struct dentry *tx_spec;
 101                 struct dentry *rx_spec;
 102                 struct dentry *replays;
 103                 struct dentry *key;
 104                 struct dentry *ifindex;
 105         } debugfs;
 106 #endif
 107
 108         /*
 109          * key config, must be last because it contains key
 110          * material as variable length member
 111          */
 112         struct ieee80211_key_conf conf;
 113 };
 114
 115 struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
 116                                           struct sta_info *sta,
 117                                           enum ieee80211_key_alg alg,
 118                                           int idx,
 119                                           size_t key_len,
 120                                           const u8 *key_data);
 121 void ieee80211_key_free(struct ieee80211_key *key);
 122 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
 123 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 124 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 125 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
 126
 127 #endif /* IEEE80211_KEY_H */