mac80211: allow drivers to access key sequence counter
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / key.h
blob86b216b01415ac52853059da8a0abbd7fdb7a7ef
1 /*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
3 * Copyright 2005, Devicescape Software, Inc.
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 */
10 #ifndef IEEE80211_KEY_H
11 #define IEEE80211_KEY_H
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>
19 #define NUM_DEFAULT_KEYS 4
20 #define NUM_DEFAULT_MGMT_KEYS 2
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
33 #define NUM_RX_DATA_QUEUES 16
35 struct ieee80211_local;
36 struct ieee80211_sub_if_data;
37 struct sta_info;
39 /**
40 * enum ieee80211_internal_key_flags - internal key flags
42 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
43 * in the hardware for TX crypto hardware acceleration.
45 enum ieee80211_internal_key_flags {
46 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
49 enum ieee80211_internal_tkip_state {
50 TKIP_STATE_NOT_INIT,
51 TKIP_STATE_PHASE1_DONE,
52 TKIP_STATE_PHASE1_HW_UPLOADED,
55 struct tkip_ctx {
56 u32 iv32; /* current iv32 */
57 u16 iv16; /* current iv16 */
58 u16 p1k[5]; /* p1k cache */
59 u32 p1k_iv32; /* iv32 for which p1k computed */
60 enum ieee80211_internal_tkip_state state;
63 struct ieee80211_key {
64 struct ieee80211_local *local;
65 struct ieee80211_sub_if_data *sdata;
66 struct sta_info *sta;
68 /* for sdata list */
69 struct list_head list;
71 /* protected by key mutex */
72 unsigned int flags;
74 union {
75 struct {
76 /* protects tx context */
77 spinlock_t txlock;
79 /* last used TSC */
80 struct tkip_ctx tx;
82 /* last received RSC */
83 struct tkip_ctx rx[NUM_RX_DATA_QUEUES];
84 } tkip;
85 struct {
86 atomic64_t tx_pn;
88 * Last received packet number. The first
89 * NUM_RX_DATA_QUEUES counters are used with Data
90 * frames and the last counter is used with Robust
91 * Management frames.
93 u8 rx_pn[NUM_RX_DATA_QUEUES + 1][CCMP_PN_LEN];
94 struct crypto_cipher *tfm;
95 u32 replays; /* dot11RSNAStatsCCMPReplays */
96 } ccmp;
97 struct {
98 atomic64_t tx_pn;
99 u8 rx_pn[CMAC_PN_LEN];
100 struct crypto_cipher *tfm;
101 u32 replays; /* dot11RSNAStatsCMACReplays */
102 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
103 } aes_cmac;
104 } u;
106 /* number of times this key has been used */
107 int tx_rx_count;
109 #ifdef CONFIG_MAC80211_DEBUGFS
110 struct {
111 struct dentry *stalink;
112 struct dentry *dir;
113 int cnt;
114 } debugfs;
115 #endif
118 * key config, must be last because it contains key
119 * material as variable length member
121 struct ieee80211_key_conf conf;
124 struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
125 const u8 *key_data,
126 size_t seq_len, const u8 *seq);
128 * Insert a key into data structures (sdata, sta if necessary)
129 * to make it used, free old key.
131 int __must_check ieee80211_key_link(struct ieee80211_key *key,
132 struct ieee80211_sub_if_data *sdata,
133 struct sta_info *sta);
134 void __ieee80211_key_free(struct ieee80211_key *key);
135 void ieee80211_key_free(struct ieee80211_local *local,
136 struct ieee80211_key *key);
137 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
138 bool uni, bool multi);
139 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
140 int idx);
141 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
142 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
143 void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata);
145 #define key_mtx_dereference(local, ref) \
146 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
148 #endif /* IEEE80211_KEY_H */