xref: /openbmc/linux/net/mac80211/key.h (revision a2818ee4)
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 	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 tkip_ctx_rx {
53 	struct tkip_ctx ctx;
54 	u32 iv32;	/* current iv32 */
55 	u16 iv16;	/* current iv16 */
56 };
57 
58 struct ieee80211_key {
59 	struct ieee80211_local *local;
60 	struct ieee80211_sub_if_data *sdata;
61 	struct sta_info *sta;
62 
63 	/* for sdata list */
64 	struct list_head list;
65 
66 	/* protected by key mutex */
67 	unsigned int flags;
68 
69 	union {
70 		struct {
71 			/* protects tx context */
72 			spinlock_t txlock;
73 
74 			/* last used TSC */
75 			struct tkip_ctx tx;
76 
77 			/* last received RSC */
78 			struct tkip_ctx_rx rx[IEEE80211_NUM_TIDS];
79 
80 			/* number of mic failures */
81 			u32 mic_failures;
82 		} tkip;
83 		struct {
84 			/*
85 			 * Last received packet number. The first
86 			 * IEEE80211_NUM_TIDS counters are used with Data
87 			 * frames and the last counter is used with Robust
88 			 * Management frames.
89 			 */
90 			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
91 			struct crypto_aead *tfm;
92 			u32 replays; /* dot11RSNAStatsCCMPReplays */
93 		} ccmp;
94 		struct {
95 			u8 rx_pn[IEEE80211_CMAC_PN_LEN];
96 			struct crypto_shash *tfm;
97 			u32 replays; /* dot11RSNAStatsCMACReplays */
98 			u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
99 		} aes_cmac;
100 		struct {
101 			u8 rx_pn[IEEE80211_GMAC_PN_LEN];
102 			struct crypto_aead *tfm;
103 			u32 replays; /* dot11RSNAStatsCMACReplays */
104 			u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
105 		} aes_gmac;
106 		struct {
107 			/* Last received packet number. The first
108 			 * IEEE80211_NUM_TIDS counters are used with Data
109 			 * frames and the last counter is used with Robust
110 			 * Management frames.
111 			 */
112 			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN];
113 			struct crypto_aead *tfm;
114 			u32 replays; /* dot11RSNAStatsGCMPReplays */
115 		} gcmp;
116 		struct {
117 			/* generic cipher scheme */
118 			u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_MAX_PN_LEN];
119 		} gen;
120 	} u;
121 
122 #ifdef CONFIG_MAC80211_DEBUGFS
123 	struct {
124 		struct dentry *stalink;
125 		struct dentry *dir;
126 		int cnt;
127 	} debugfs;
128 #endif
129 
130 	/*
131 	 * key config, must be last because it contains key
132 	 * material as variable length member
133 	 */
134 	struct ieee80211_key_conf conf;
135 };
136 
137 struct ieee80211_key *
138 ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
139 		    const u8 *key_data,
140 		    size_t seq_len, const u8 *seq,
141 		    const struct ieee80211_cipher_scheme *cs);
142 /*
143  * Insert a key into data structures (sdata, sta if necessary)
144  * to make it used, free old key. On failure, also free the new key.
145  */
146 int ieee80211_key_link(struct ieee80211_key *key,
147 		       struct ieee80211_sub_if_data *sdata,
148 		       struct sta_info *sta);
149 void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
150 void ieee80211_key_free_unused(struct ieee80211_key *key);
151 void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
152 			       bool uni, bool multi);
153 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
154 				    int idx);
155 void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
156 			 bool force_synchronize);
157 void ieee80211_free_sta_keys(struct ieee80211_local *local,
158 			     struct sta_info *sta);
159 void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
160 void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata);
161 
162 #define key_mtx_dereference(local, ref) \
163 	rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
164 
165 void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
166 
167 #endif /* IEEE80211_KEY_H */
168