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 NUM_DEFAULT_KEYS 4
  20 #define NUM_DEFAULT_MGMT_KEYS 2
  21
  22 #define WEP_IV_LEN              4
  23 #define WEP_ICV_LEN             4
  24 #define ALG_TKIP_KEY_LEN        32
  25 #define ALG_CCMP_KEY_LEN        16
  26 #define CCMP_HDR_LEN            8
  27 #define CCMP_MIC_LEN            8
  28 #define CCMP_TK_LEN             16
  29 #define CCMP_PN_LEN             6
  30 #define TKIP_IV_LEN             8
  31 #define TKIP_ICV_LEN            4
  32
  33 #define NUM_RX_DATA_QUEUES      17
  34
  35 struct ieee80211_local;
  36 struct ieee80211_sub_if_data;
  37 struct sta_info;
  38
  39 /**
  40  * enum ieee80211_internal_key_flags - internal key flags
  41  *
  42  * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
  43  *      in the hardware for TX crypto hardware acceleration.
  44  */
  45 enum ieee80211_internal_key_flags {
  46         KEY_FLAG_UPLOADED_TO_HARDWARE   = BIT(0),
  47 };
  48
  49 enum ieee80211_internal_tkip_state {
  50         TKIP_STATE_NOT_INIT,
  51         TKIP_STATE_PHASE1_DONE,
  52         TKIP_STATE_PHASE1_HW_UPLOADED,
  53 };
  54
  55 struct tkip_ctx {
  56         u32 iv32;
  57         u16 iv16;
  58         u16 p1k[5];
  59         enum ieee80211_internal_tkip_state state;
  60 };
  61
  62 struct ieee80211_key {
  63         struct ieee80211_local *local;
  64         struct ieee80211_sub_if_data *sdata;
  65         struct sta_info *sta;
  66
  67         /* for sdata list */
  68         struct list_head list;
  69
  70         /* protected by key mutex */
  71         unsigned int flags;
  72
  73         union {
  74                 struct {
  75                         /* last used TSC */
  76                         struct tkip_ctx tx;
  77
  78                         /* last received RSC */
  79                         struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
  80                 } tkip;
  81                 struct {
  82                         u8 tx_pn[6];
  83                         /*
  84                          * Last received packet number. The first
  85                          * NUM_RX_DATA_QUEUES counters are used with Data
  86                          * frames and the last counter is used with Robust
  87                          * Management frames.
  88                          */
  89                         u8 rx_pn[NUM_RX_DATA_QUEUES + 1][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                 struct {
 100                         u8 tx_pn[6];
 101                         u8 rx_pn[6];
 102                         struct crypto_cipher *tfm;
 103                         u32 replays; /* dot11RSNAStatsCMACReplays */
 104                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
 105                         /* scratch buffers for virt_to_page() (crypto API) */
 106                         u8 tx_crypto_buf[2 * AES_BLOCK_LEN];
 107                         u8 rx_crypto_buf[2 * AES_BLOCK_LEN];
 108                 } aes_cmac;
 109         } u;
 110
 111         /* number of times this key has been used */
 112         int tx_rx_count;
 113
 114 #ifdef CONFIG_MAC80211_DEBUGFS
 115         struct {
 116                 struct dentry *stalink;
 117                 struct dentry *dir;
 118                 int cnt;
 119         } debugfs;
 120 #endif
 121
 122         /*
 123          * key config, must be last because it contains key
 124          * material as variable length member
 125          */
 126         struct ieee80211_key_conf conf;
 127 };
 128
 129 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 130                                           const u8 *key_data,
 131                                           size_t seq_len, const u8 *seq);
 132 /*
 133  * Insert a key into data structures (sdata, sta if necessary)
 134  * to make it used, free old key.
 135  */
 136 int __must_check ieee80211_key_link(struct ieee80211_key *key,
 137                                     struct ieee80211_sub_if_data *sdata,
 138                                     struct sta_info *sta);
 139 void ieee80211_key_free(struct ieee80211_local *local,
 140                         struct ieee80211_key *key);
 141 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx);
 142 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 143                                     int idx);
 144 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 145 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 146 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
 147
 148 #endif /* IEEE80211_KEY_H */