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/kref.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_key {
  45         struct kref kref;
  46
  47         int hw_key_idx; /* filled and used by low-level driver */
  48         ieee80211_key_alg alg;
  49         union {
  50                 struct {
  51                         /* last used TSC */
  52                         u32 iv32;
  53                         u16 iv16;
  54                         u16 p1k[5];
  55                         int tx_initialized;
  56
  57                         /* last received RSC */
  58                         u32 iv32_rx[NUM_RX_DATA_QUEUES];
  59                         u16 iv16_rx[NUM_RX_DATA_QUEUES];
  60                         u16 p1k_rx[NUM_RX_DATA_QUEUES][5];
  61                         int rx_initialized[NUM_RX_DATA_QUEUES];
  62                 } tkip;
  63                 struct {
  64                         u8 tx_pn[6];
  65                         u8 rx_pn[NUM_RX_DATA_QUEUES][6];
  66                         struct crypto_cipher *tfm;
  67                         u32 replays; /* dot11RSNAStatsCCMPReplays */
  68                         /* scratch buffers for virt_to_page() (crypto API) */
  69 #ifndef AES_BLOCK_LEN
  70 #define AES_BLOCK_LEN 16
  71 #endif
  72                         u8 tx_crypto_buf[6 * AES_BLOCK_LEN];
  73                         u8 rx_crypto_buf[6 * AES_BLOCK_LEN];
  74                 } ccmp;
  75         } u;
  76         int tx_rx_count; /* number of times this key has been used */
  77         int keylen;
  78
  79         /* if the low level driver can provide hardware acceleration it should
  80          * clear this flag */
  81         unsigned int force_sw_encrypt:1;
  82         unsigned int default_tx_key:1; /* This key is the new default TX key
  83                                         * (used only for broadcast keys). */
  84         s8 keyidx; /* WEP key index */
  85
  86 #ifdef CONFIG_MAC80211_DEBUGFS
  87         struct {
  88                 struct dentry *stalink;
  89                 struct dentry *dir;
  90                 struct dentry *keylen;
  91                 struct dentry *force_sw_encrypt;
  92                 struct dentry *keyidx;
  93                 struct dentry *hw_key_idx;
  94                 struct dentry *tx_rx_count;
  95                 struct dentry *algorithm;
  96                 struct dentry *tx_spec;
  97                 struct dentry *rx_spec;
  98                 struct dentry *replays;
  99                 struct dentry *key;
 100         } debugfs;
 101 #endif
 102
 103         u8 key[0];
 104 };
 105
 106 #endif /* IEEE80211_KEY_H */