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 struct ieee80211_local;
  23 struct ieee80211_sub_if_data;
  24 struct sta_info;
  25
  26 /**
  27  * enum ieee80211_internal_key_flags - internal key flags
  28  *
  29  * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
  30  *      in the hardware for TX crypto hardware acceleration.
  31  * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
  32  * @KEY_FLAG_CIPHER_SCHEME: This key is for a hardware cipher scheme
  33  */
  34 enum ieee80211_internal_key_flags {
  35         KEY_FLAG_UPLOADED_TO_HARDWARE   = BIT(0),
  36         KEY_FLAG_TAINTED                = BIT(1),
  37         KEY_FLAG_CIPHER_SCHEME          = BIT(2),
  38 };
  39
  40 enum ieee80211_internal_tkip_state {
  41         TKIP_STATE_NOT_INIT,
  42         TKIP_STATE_PHASE1_DONE,
  43         TKIP_STATE_PHASE1_HW_UPLOADED,
  44 };
  45
  46 struct tkip_ctx {
  47         u16 p1k[5];     /* p1k cache */
  48         u32 p1k_iv32;   /* iv32 for which p1k computed */
  49         enum ieee80211_internal_tkip_state state;
  50 };
  51
  52 struct tkip_ctx_rx {
  53         struct tkip_ctx ctx;
  54         u32 iv32;       /* current iv32 */
  55         u16 iv16;       /* current iv16 */
  56 };
  57
  58 struct ieee80211_key {
  59         struct ieee80211_local *local;
  60         struct ieee80211_sub_if_data *sdata;
  61         struct sta_info *sta;
  62
  63         /* for sdata list */
  64         struct list_head list;
  65
  66         /* protected by key mutex */
  67         unsigned int flags;
  68
  69         union {
  70                 struct {
  71                         /* protects tx context */
  72                         spinlock_t txlock;
  73
  74                         /* last used TSC */
  75                         struct tkip_ctx tx;
  76
  77                         /* last received RSC */
  78                         struct tkip_ctx_rx rx[IEEE80211_NUM_TIDS];
  79
  80                         /* number of mic failures */
  81                         u32 mic_failures;
  82                 } tkip;
  83                 struct {
  84                         /*
  85                          * Last received packet number. The first
  86                          * IEEE80211_NUM_TIDS counters are used with Data
  87                          * frames and the last counter is used with Robust
  88                          * Management frames.
  89                          */
  90                         u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
  91                         struct crypto_aead *tfm;
  92                         u32 replays; /* dot11RSNAStatsCCMPReplays */
  93                 } ccmp;
  94                 struct {
  95                         u8 rx_pn[IEEE80211_CMAC_PN_LEN];
  96                         struct crypto_cipher *tfm;
  97                         u32 replays; /* dot11RSNAStatsCMACReplays */
  98                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
  99                 } aes_cmac;
 100                 struct {
 101                         u8 rx_pn[IEEE80211_GMAC_PN_LEN];
 102                         struct crypto_aead *tfm;
 103                         u32 replays; /* dot11RSNAStatsCMACReplays */
 104                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
 105                 } aes_gmac;
 106                 struct {
 107                         /* Last received packet number. The first
 108                          * IEEE80211_NUM_TIDS counters are used with Data
 109                          * frames and the last counter is used with Robust
 110                          * Management frames.
 111                          */
 112                         u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN];
 113                         struct crypto_aead *tfm;
 114                         u32 replays; /* dot11RSNAStatsGCMPReplays */
 115                 } gcmp;
 116                 struct {
 117                         /* generic cipher scheme */
 118                         u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_MAX_PN_LEN];
 119                 } gen;
 120         } u;
 121
 122 #ifdef CONFIG_MAC80211_DEBUGFS
 123         struct {
 124                 struct dentry *stalink;
 125                 struct dentry *dir;
 126                 int cnt;
 127         } debugfs;
 128 #endif
 129
 130         /*
 131          * key config, must be last because it contains key
 132          * material as variable length member
 133          */
 134         struct ieee80211_key_conf conf;
 135 };
 136
 137 struct ieee80211_key *
 138 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 139                     const u8 *key_data,
 140                     size_t seq_len, const u8 *seq,
 141                     const struct ieee80211_cipher_scheme *cs);
 142 /*
 143  * Insert a key into data structures (sdata, sta if necessary)
 144  * to make it used, free old key. On failure, also free the new key.
 145  */
 146 int ieee80211_key_link(struct ieee80211_key *key,
 147                        struct ieee80211_sub_if_data *sdata,
 148                        struct sta_info *sta);
 149 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
 150 void ieee80211_key_free_unused(struct ieee80211_key *key);
 151 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 152                                bool uni, bool multi);
 153 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 154                                     int idx);
 155 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
 156                          bool force_synchronize);
 157 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 158                              struct sta_info *sta);
 159 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 160 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata);
 161
 162 #define key_mtx_dereference(local, ref) \
 163         rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
 164
 165 void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
 166
 167 #endif /* IEEE80211_KEY_H */