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  */
  33 enum ieee80211_internal_key_flags {
  34         KEY_FLAG_UPLOADED_TO_HARDWARE   = BIT(0),
  35         KEY_FLAG_TAINTED                = BIT(1),
  36 };
  37
  38 enum ieee80211_internal_tkip_state {
  39         TKIP_STATE_NOT_INIT,
  40         TKIP_STATE_PHASE1_DONE,
  41         TKIP_STATE_PHASE1_HW_UPLOADED,
  42 };
  43
  44 struct tkip_ctx {
  45         u32 iv32;       /* current iv32 */
  46         u16 iv16;       /* current iv16 */
  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 ieee80211_key {
  53         struct ieee80211_local *local;
  54         struct ieee80211_sub_if_data *sdata;
  55         struct sta_info *sta;
  56
  57         /* for sdata list */
  58         struct list_head list;
  59
  60         /* protected by key mutex */
  61         unsigned int flags;
  62
  63         union {
  64                 struct {
  65                         /* protects tx context */
  66                         spinlock_t txlock;
  67
  68                         /* last used TSC */
  69                         struct tkip_ctx tx;
  70
  71                         /* last received RSC */
  72                         struct tkip_ctx rx[IEEE80211_NUM_TIDS];
  73
  74                         /* number of mic failures */
  75                         u32 mic_failures;
  76                 } tkip;
  77                 struct {
  78                         atomic64_t tx_pn;
  79                         /*
  80                          * Last received packet number. The first
  81                          * IEEE80211_NUM_TIDS counters are used with Data
  82                          * frames and the last counter is used with Robust
  83                          * Management frames.
  84                          */
  85                         u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
  86                         struct crypto_aead *tfm;
  87                         u32 replays; /* dot11RSNAStatsCCMPReplays */
  88                 } ccmp;
  89                 struct {
  90                         atomic64_t tx_pn;
  91                         u8 rx_pn[IEEE80211_CMAC_PN_LEN];
  92                         struct crypto_cipher *tfm;
  93                         u32 replays; /* dot11RSNAStatsCMACReplays */
  94                         u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
  95                 } aes_cmac;
  96         } u;
  97
  98         /* number of times this key has been used */
  99         int tx_rx_count;
 100
 101 #ifdef CONFIG_MAC80211_DEBUGFS
 102         struct {
 103                 struct dentry *stalink;
 104                 struct dentry *dir;
 105                 int cnt;
 106         } debugfs;
 107 #endif
 108
 109         /*
 110          * key config, must be last because it contains key
 111          * material as variable length member
 112          */
 113         struct ieee80211_key_conf conf;
 114 };
 115
 116 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 117                                           const u8 *key_data,
 118                                           size_t seq_len, const u8 *seq);
 119 /*
 120  * Insert a key into data structures (sdata, sta if necessary)
 121  * to make it used, free old key. On failure, also free the new key.
 122  */
 123 int ieee80211_key_link(struct ieee80211_key *key,
 124                        struct ieee80211_sub_if_data *sdata,
 125                        struct sta_info *sta);
 126 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
 127 void ieee80211_key_free_unused(struct ieee80211_key *key);
 128 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 129                                bool uni, bool multi);
 130 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 131                                     int idx);
 132 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 133 void ieee80211_free_sta_keys(struct ieee80211_local *local,
 134                              struct sta_info *sta);
 135 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 136
 137 #define key_mtx_dereference(local, ref) \
 138         rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
 139
 140 void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
 141
 142 #endif /* IEEE80211_KEY_H */