linux/net/mac80211/key.h
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   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_CCMP_KEY_LEN        16
  25#define CCMP_HDR_LEN            8
  26#define CCMP_MIC_LEN            8
  27#define CCMP_TK_LEN             16
  28#define CCMP_PN_LEN             6
  29#define TKIP_IV_LEN             8
  30#define TKIP_ICV_LEN            4
  31#define CMAC_PN_LEN             6
  32
  33#define NUM_RX_DATA_QUEUES      16
  34
  35struct ieee80211_local;
  36struct ieee80211_sub_if_data;
  37struct 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 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
  45 */
  46enum ieee80211_internal_key_flags {
  47        KEY_FLAG_UPLOADED_TO_HARDWARE   = BIT(0),
  48        KEY_FLAG_TAINTED                = BIT(1),
  49};
  50
  51enum ieee80211_internal_tkip_state {
  52        TKIP_STATE_NOT_INIT,
  53        TKIP_STATE_PHASE1_DONE,
  54        TKIP_STATE_PHASE1_HW_UPLOADED,
  55};
  56
  57struct tkip_ctx {
  58        u32 iv32;       /* current iv32 */
  59        u16 iv16;       /* current iv16 */
  60        u16 p1k[5];     /* p1k cache */
  61        u32 p1k_iv32;   /* iv32 for which p1k computed */
  62        enum ieee80211_internal_tkip_state state;
  63};
  64
  65struct ieee80211_key {
  66        struct ieee80211_local *local;
  67        struct ieee80211_sub_if_data *sdata;
  68        struct sta_info *sta;
  69
  70        /* for sdata list */
  71        struct list_head list;
  72
  73        /* protected by key mutex */
  74        unsigned int flags;
  75
  76        union {
  77                struct {
  78                        /* protects tx context */
  79                        spinlock_t txlock;
  80
  81                        /* last used TSC */
  82                        struct tkip_ctx tx;
  83
  84                        /* last received RSC */
  85                        struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
  86                } tkip;
  87                struct {
  88                        atomic64_t tx_pn;
  89                        /*
  90                         * Last received packet number. The first
  91                         * NUM_RX_DATA_QUEUES counters are used with Data
  92                         * frames and the last counter is used with Robust
  93                         * Management frames.
  94                         */
  95                        u8 rx_pn[NUM_RX_DATA_QUEUES + 1][CCMP_PN_LEN];
  96                        struct crypto_cipher *tfm;
  97                        u32 replays; /* dot11RSNAStatsCCMPReplays */
  98                } ccmp;
  99                struct {
 100                        atomic64_t tx_pn;
 101                        u8 rx_pn[CMAC_PN_LEN];
 102                        struct crypto_cipher *tfm;
 103                        u32 replays; /* dot11RSNAStatsCMACReplays */
 104                        u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
 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
 126struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
 127                                          const u8 *key_data,
 128                                          size_t seq_len, const u8 *seq);
 129/*
 130 * Insert a key into data structures (sdata, sta if necessary)
 131 * to make it used, free old key.
 132 */
 133int __must_check ieee80211_key_link(struct ieee80211_key *key,
 134                                    struct ieee80211_sub_if_data *sdata,
 135                                    struct sta_info *sta);
 136void __ieee80211_key_free(struct ieee80211_key *key);
 137void ieee80211_key_free(struct ieee80211_local *local,
 138                        struct ieee80211_key *key);
 139void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
 140                               bool uni, bool multi);
 141void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
 142                                    int idx);
 143void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
 144void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
 145void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
 146
 147#define key_mtx_dereference(local, ref) \
 148        rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
 149
 150#endif /* IEEE80211_KEY_H */
 151
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