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