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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 | struct ieee80211_local; |
34 | struct ieee80211_sub_if_data; |
35 | struct sta_info; |
36 | |
37 | /** |
38 | * enum ieee80211_internal_key_flags - internal key flags |
39 | * |
40 | * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present |
41 | * in the hardware for TX crypto hardware acceleration. |
42 | * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped. |
43 | */ |
44 | enum ieee80211_internal_key_flags { |
45 | KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0), |
46 | KEY_FLAG_TAINTED = BIT(1), |
47 | }; |
48 | |
49 | enum ieee80211_internal_tkip_state { |
50 | TKIP_STATE_NOT_INIT, |
51 | TKIP_STATE_PHASE1_DONE, |
52 | TKIP_STATE_PHASE1_HW_UPLOADED, |
53 | }; |
54 | |
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; |
61 | }; |
62 | |
63 | struct ieee80211_key { |
64 | struct ieee80211_local *local; |
65 | struct ieee80211_sub_if_data *sdata; |
66 | struct sta_info *sta; |
67 | |
68 | /* for sdata list */ |
69 | struct list_head list; |
70 | |
71 | /* protected by key mutex */ |
72 | unsigned int flags; |
73 | |
74 | union { |
75 | struct { |
76 | /* protects tx context */ |
77 | spinlock_t txlock; |
78 | |
79 | /* last used TSC */ |
80 | struct tkip_ctx tx; |
81 | |
82 | /* last received RSC */ |
83 | struct tkip_ctx rx[IEEE80211_NUM_TIDS]; |
84 | |
85 | /* number of mic failures */ |
86 | u32 mic_failures; |
87 | } tkip; |
88 | struct { |
89 | atomic64_t tx_pn; |
90 | /* |
91 | * Last received packet number. The first |
92 | * IEEE80211_NUM_TIDS counters are used with Data |
93 | * frames and the last counter is used with Robust |
94 | * Management frames. |
95 | */ |
96 | u8 rx_pn[IEEE80211_NUM_TIDS + 1][CCMP_PN_LEN]; |
97 | struct crypto_cipher *tfm; |
98 | u32 replays; /* dot11RSNAStatsCCMPReplays */ |
99 | } ccmp; |
100 | struct { |
101 | atomic64_t tx_pn; |
102 | u8 rx_pn[CMAC_PN_LEN]; |
103 | struct crypto_cipher *tfm; |
104 | u32 replays; /* dot11RSNAStatsCMACReplays */ |
105 | u32 icverrors; /* dot11RSNAStatsCMACICVErrors */ |
106 | } aes_cmac; |
107 | } u; |
108 | |
109 | /* number of times this key has been used */ |
110 | int tx_rx_count; |
111 | |
112 | #ifdef CONFIG_MAC80211_DEBUGFS |
113 | struct { |
114 | struct dentry *stalink; |
115 | struct dentry *dir; |
116 | int cnt; |
117 | } debugfs; |
118 | #endif |
119 | |
120 | /* |
121 | * key config, must be last because it contains key |
122 | * material as variable length member |
123 | */ |
124 | struct ieee80211_key_conf conf; |
125 | }; |
126 | |
127 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
128 | const u8 *key_data, |
129 | size_t seq_len, const u8 *seq); |
130 | /* |
131 | * Insert a key into data structures (sdata, sta if necessary) |
132 | * to make it used, free old key. |
133 | */ |
134 | int __must_check ieee80211_key_link(struct ieee80211_key *key, |
135 | struct ieee80211_sub_if_data *sdata, |
136 | struct sta_info *sta); |
137 | void __ieee80211_key_free(struct ieee80211_key *key); |
138 | void ieee80211_key_free(struct ieee80211_local *local, |
139 | struct ieee80211_key *key); |
140 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
141 | bool uni, bool multi); |
142 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, |
143 | int idx); |
144 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata); |
145 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata); |
146 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata); |
147 | |
148 | #define key_mtx_dereference(local, ref) \ |
149 | rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx))) |
150 | |
151 | #endif /* IEEE80211_KEY_H */ |
152 |
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