projects/linux·blob master · refs

175 lines · 4.9 KiB

1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright 2002-2004, Instant802 Networks, Inc.
4 * Copyright 2005, Devicescape Software, Inc.
5 * Copyright (C) 2019, 2022-2023 Intel Corporation
6 */
7
8#ifndef IEEE80211_KEY_H
9#define IEEE80211_KEY_H
10
11#include <linux/types.h>
12#include <linux/list.h>
13#include <linux/crypto.h>
14#include <linux/rcupdate.h>
15#include <crypto/aes-cbc-macs.h>
16#include <crypto/arc4.h>
17#include <net/mac80211.h>
18
19#define NUM_DEFAULT_KEYS 4
20#define NUM_DEFAULT_MGMT_KEYS 2
21#define NUM_DEFAULT_BEACON_KEYS 2
22#define INVALID_PTK_KEYIDX 2 /* Keyidx always pointing to a NULL key for PTK */
23
24struct ieee80211_local;
25struct ieee80211_sub_if_data;
26struct ieee80211_link_data;
27struct sta_info;
28
29/**
30 * enum ieee80211_internal_key_flags - internal key flags
31 *
32 * @KEY_FLAG_UPLOADED_TO_HARDWARE: Indicates that this key is present
33 * in the hardware for TX crypto hardware acceleration.
34 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
35 */
36enum ieee80211_internal_key_flags {
37 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
38 KEY_FLAG_TAINTED = BIT(1),
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 u16 p1k[5]; /* p1k cache */
49 u32 p1k_iv32; /* iv32 for which p1k computed */
50 enum ieee80211_internal_tkip_state state;
51};
52
53struct tkip_ctx_rx {
54 struct tkip_ctx ctx;
55 u32 iv32; /* current iv32 */
56 u16 iv16; /* current iv16 */
57};
58
59struct ieee80211_key {
60 struct ieee80211_local *local;
61 struct ieee80211_sub_if_data *sdata;
62 struct sta_info *sta;
63
64 /* for sdata list */
65 struct list_head list;
66
67 /* protected by key mutex */
68 unsigned int flags;
69
70 union {
71 struct {
72 /* protects tx context */
73 spinlock_t txlock;
74
75 /* last used TSC */
76 struct tkip_ctx tx;
77
78 /* last received RSC */
79 struct tkip_ctx_rx rx[IEEE80211_NUM_TIDS];
80
81 /* number of mic failures */
82 u32 mic_failures;
83 } tkip;
84 struct {
85 /*
86 * Last received packet number. The first
87 * IEEE80211_NUM_TIDS counters are used with Data
88 * frames and the last counter is used with Robust
89 * Management frames.
90 */
91 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
92 struct crypto_aead *tfm;
93 u32 replays; /* dot11RSNAStatsCCMPReplays */
94 } ccmp;
95 struct {
96 u8 rx_pn[IEEE80211_CMAC_PN_LEN];
97 struct aes_cmac_key key;
98 u32 replays; /* dot11RSNAStatsCMACReplays */
99 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
100 } aes_cmac;
101 struct {
102 u8 rx_pn[IEEE80211_GMAC_PN_LEN];
103 struct crypto_aead *tfm;
104 u32 replays; /* dot11RSNAStatsCMACReplays */
105 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
106 } aes_gmac;
107 struct {
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][IEEE80211_MAX_PN_LEN];
120 } gen;
121 } u;
122
123#ifdef CONFIG_MAC80211_DEBUGFS
124 struct {
125 struct dentry *stalink;
126 struct dentry *dir;
127 int cnt;
128 } debugfs;
129#endif
130
131 unsigned int color;
132
133 /*
134 * key config, must be last because it contains key
135 * material as variable length member
136 */
137 struct ieee80211_key_conf conf;
138};
139
140struct ieee80211_key *
141ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
142 const u8 *key_data,
143 size_t seq_len, const u8 *seq);
144/*
145 * Insert a key into data structures (sdata, sta if necessary)
146 * to make it used, free old key. On failure, also free the new key.
147 */
148int ieee80211_key_link(struct ieee80211_key *key,
149 struct ieee80211_link_data *link,
150 struct sta_info *sta);
151int ieee80211_set_tx_key(struct ieee80211_key *key);
152void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
153void ieee80211_key_free_unused(struct ieee80211_key *key);
154void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
155 bool uni, bool multi);
156void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
157 int idx);
158void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
159 int idx);
160void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
161 struct list_head *keys);
162void ieee80211_free_key_list(struct ieee80211_local *local,
163 struct list_head *keys);
164void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
165 bool force_synchronize);
166void ieee80211_free_sta_keys(struct ieee80211_local *local,
167 struct sta_info *sta);
168void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata);
169int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
170 unsigned long del_links_mask,
171 unsigned long add_links_mask);
172void ieee80211_delayed_tailroom_dec(struct wiphy *wiphy,
173 struct wiphy_work *wk);
174
175#endif /* IEEE80211_KEY_H */