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  */
  42 enum ieee80211_internal_key_flags {
  43         KEY_FLAG_UPLOADED_TO_HARDWARE   = BIT(0),
  44 };
  45
  46 enum ieee80211_internal_tkip_state {
  47         TKIP_STATE_NOT_INIT,
  48         TKIP_STATE_PHASE1_DONE,
  49         TKIP_STATE_PHASE1_HW_UPLOADED,
  50 };
  51
  52 struct tkip_ctx {
  53         u32 iv32;
  54         u16 iv16;
  55         u16 p1k[5];
  56         enum ieee80211_internal_tkip_state state;
  57 };
  58
  59 struct ieee80211_key {
  60         struct ieee80211_local *local;
  61         struct ieee80211_sub_if_data *sdata;
  62         struct sta_info *sta;
  63
  64         /* for sdata list */
  65         struct list_head list;
  66
  67         /* protected by key mutex */
  68         unsigned int flags;
  69
  70         union {
  71                 struct {
  72                         /* last used TSC */
  73                         struct tkip_ctx tx;
  74
  75                         /* last received RSC */
  76                         struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
  77                 } tkip;
  78                 struct {
  79                         u8 tx_pn[6];
  80                         /*
  81                          * Last received packet number. The first
  82                          * NUM_RX_DATA_QUEUES counters are used with Data
  83                          * frames and the last counter is used with Robust
  84                          * Management frames.
  85                          */
  86                         u8 rx_pn[NUM_RX_DATA_QUEUES + 1][6];
  87                         struct crypto_cipher *tfm;
  88                         u32 replays; /* dot11RSNAStatsCCMPReplays */
  89                         /* scratch buffers for virt_to_page() (crypto API) */
  90 #ifndef AES_BLOCK_LEN
  91 #define AES_BLOCK_LEN 16
  92 #endif
  93                         u8 tx_crypto_buf[6 * AES_BLOCK_LEN];
  94                         u8 rx_crypto_buf[6 * AES_BLOCK_LEN];
  95                 } ccmp;
  96                 struct {
  97                         u8 tx_pn[6];
  98                         u8 rx_pn[6];
  99                         struct crypto_cipher *tfm;
 100                         u32 replays; /* dot11RSNAStatsCMACReplays */
 101                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
 102                         /* scratch buffers for virt_to_page() (crypto API) */
 103                         u8 tx_crypto_buf[2 * AES_BLOCK_LEN];
 104                         u8 rx_crypto_buf[2 * AES_BLOCK_LEN];
 105                 } aes_cmac;
 106         } u;
 107
 108         /* number of times this key has been used */
 109         int tx_rx_count;
 110
 111 #ifdef CONFIG_MAC80211_DEBUGFS
 112         struct {
 113                 struct dentry *stalink;
 114                 struct dentry *dir;
 115                 int cnt;
 116         } debugfs;
 117 #endif
 118
 119         /*
 120          * key config, must be last because it contains key
 121          * material as variable length member
 122          */
 123         struct ieee80211_key_conf conf;
 124 };
 125
 126 struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg,
 127                                           int idx,
 128                                           size_t key_len,
 129                                           const u8 *key_data,
 130                                           size_t seq_len, const u8 *seq);
 131 /*
 132  * Insert a key into data structures (sdata, sta if necessary)
 133  * to make it used, free old key.
 134  */
 135 void ieee80211_key_link(struct ieee80211_key *key,
 136                         struct ieee80211_sub_if_data *sdata,
 137                         struct sta_info *sta);
 138 void ieee80211_key_free(struct ieee80211_local *local,
 139                         struct ieee80211_key *key);
 140 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
 141 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 142                                     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 #endif /* IEEE80211_KEY_H */