tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#define MAX_PN_LEN 16
22
23struct ieee80211_local;
24struct ieee80211_sub_if_data;
25struct sta_info;
26
27/**
28 * enum ieee80211_internal_key_flags - internal key flags
29 *
30 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
31 * in the hardware for TX crypto hardware acceleration.
32 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
33 * @KEY_FLAG_CIPHER_SCHEME: This key is for a hardware cipher scheme
34 */
35enum ieee80211_internal_key_flags {
36 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
37 KEY_FLAG_TAINTED = BIT(1),
38 KEY_FLAG_CIPHER_SCHEME = BIT(2),
39};
40
41enum ieee80211_internal_tkip_state {
42 TKIP_STATE_NOT_INIT,
43 TKIP_STATE_PHASE1_DONE,
44 TKIP_STATE_PHASE1_HW_UPLOADED,
45};
46
47struct tkip_ctx {
48 u32 iv32; /* current iv32 */
49 u16 iv16; /* current iv16 */
50 u16 p1k[5]; /* p1k cache */
51 u32 p1k_iv32; /* iv32 for which p1k computed */
52 enum ieee80211_internal_tkip_state state;
53};
54
55struct ieee80211_key {
56 struct ieee80211_local *local;
57 struct ieee80211_sub_if_data *sdata;
58 struct sta_info *sta;
59
60 /* for sdata list */
61 struct list_head list;
62
63 /* protected by key mutex */
64 unsigned int flags;
65
66 union {
67 struct {
68 /* protects tx context */
69 spinlock_t txlock;
70
71 /* last used TSC */
72 struct tkip_ctx tx;
73
74 /* last received RSC */
75 struct tkip_ctx rx[IEEE80211_NUM_TIDS];
76
77 /* number of mic failures */
78 u32 mic_failures;
79 } tkip;
80 struct {
81 atomic64_t tx_pn;
82 /*
83 * Last received packet number. The first
84 * IEEE80211_NUM_TIDS counters are used with Data
85 * frames and the last counter is used with Robust
86 * Management frames.
87 */
88 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
89 struct crypto_aead *tfm;
90 u32 replays; /* dot11RSNAStatsCCMPReplays */
91 } ccmp;
92 struct {
93 atomic64_t tx_pn;
94 u8 rx_pn[IEEE80211_CMAC_PN_LEN];
95 struct crypto_cipher *tfm;
96 u32 replays; /* dot11RSNAStatsCMACReplays */
97 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
98 } aes_cmac;
99 struct {
100 atomic64_t tx_pn;
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 atomic64_t tx_pn;
108 /* Last received packet number. The first
109 * IEEE80211_NUM_TIDS counters are used with Data
110 * frames and the last counter is used with Robust
111 * Management frames.
112 */
113 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_GCMP_PN_LEN];
114 struct crypto_aead *tfm;
115 u32 replays; /* dot11RSNAStatsGCMPReplays */
116 } gcmp;
117 struct {
118 /* generic cipher scheme */
119 u8 rx_pn[IEEE80211_NUM_TIDS + 1][MAX_PN_LEN];
120 } gen;
121 } u;
122
123 /* number of times this key has been used */
124 int tx_rx_count;
125
126#ifdef CONFIG_MAC80211_DEBUGFS
127 struct {
128 struct dentry *stalink;
129 struct dentry *dir;
130 int cnt;
131 } debugfs;
132#endif
133
134 /*
135 * key config, must be last because it contains key
136 * material as variable length member
137 */
138 struct ieee80211_key_conf conf;
139};
140
141struct ieee80211_key *
142ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
143 const u8 *key_data,
144 size_t seq_len, const u8 *seq,
145 const struct ieee80211_cipher_scheme *cs);
146/*
147 * Insert a key into data structures (sdata, sta if necessary)
148 * to make it used, free old key. On failure, also free the new key.
149 */
150int ieee80211_key_link(struct ieee80211_key *key,
151 struct ieee80211_sub_if_data *sdata,
152 struct sta_info *sta);
153void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
154void ieee80211_key_free_unused(struct ieee80211_key *key);
155void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
156 bool uni, bool multi);
157void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
158 int idx);
159void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
160 bool force_synchronize);
161void ieee80211_free_sta_keys(struct ieee80211_local *local,
162 struct sta_info *sta);
163void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
164
165#define key_mtx_dereference(local, ref) \
166 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
167
168void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
169
170#endif /* IEEE80211_KEY_H */