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Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
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>
Johannes Berg8f371712007-08-28 17:01:54 -040014#include <linux/list.h>
Jiri Bencf0706e82007-05-05 11:45:53 -070015#include <linux/crypto.h>
Johannes Bergdb4d1162008-02-25 16:27:45 +010016#include <linux/rcupdate.h>
Jiri Bencf0706e82007-05-05 11:45:53 -070017#include <net/mac80211.h>
18
Johannes Berge31b8212010-10-05 19:39:30 +020019#define NUM_DEFAULT_KEYS 4
20#define NUM_DEFAULT_MGMT_KEYS 2
21
Johannes Berg11a843b2007-08-28 17:01:55 -040022struct ieee80211_local;
23struct ieee80211_sub_if_data;
24struct sta_info;
25
Johannes Bergdb4d1162008-02-25 16:27:45 +010026/**
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.
Johannes Berg95acac62011-07-12 12:30:59 +020031 * @KEY_FLAG_TAINTED: Key is tainted and packets should be dropped.
Johannes Bergdb4d1162008-02-25 16:27:45 +010032 */
33enum ieee80211_internal_key_flags {
34 KEY_FLAG_UPLOADED_TO_HARDWARE = BIT(0),
Johannes Berg95acac62011-07-12 12:30:59 +020035 KEY_FLAG_TAINTED = BIT(1),
Johannes Bergdb4d1162008-02-25 16:27:45 +010036};
Johannes Berg11a843b2007-08-28 17:01:55 -040037
gregor kowskica998612009-12-09 23:25:05 +010038enum ieee80211_internal_tkip_state {
39 TKIP_STATE_NOT_INIT,
40 TKIP_STATE_PHASE1_DONE,
41 TKIP_STATE_PHASE1_HW_UPLOADED,
42};
43
Harvey Harrisonb0f76b32008-05-14 16:26:19 -070044struct tkip_ctx {
Johannes Berg523b02e2011-07-07 22:28:01 +020045 u32 iv32; /* current iv32 */
46 u16 iv16; /* current iv16 */
47 u16 p1k[5]; /* p1k cache */
48 u32 p1k_iv32; /* iv32 for which p1k computed */
gregor kowskica998612009-12-09 23:25:05 +010049 enum ieee80211_internal_tkip_state state;
Harvey Harrisonb0f76b32008-05-14 16:26:19 -070050};
51
Jiri Bencf0706e82007-05-05 11:45:53 -070052struct ieee80211_key {
Johannes Berg11a843b2007-08-28 17:01:55 -040053 struct ieee80211_local *local;
54 struct ieee80211_sub_if_data *sdata;
55 struct sta_info *sta;
56
Johannes Berg3b967662008-04-08 17:56:52 +020057 /* for sdata list */
Johannes Berg11a843b2007-08-28 17:01:55 -040058 struct list_head list;
59
Johannes Bergad0e2b52010-06-01 10:19:19 +020060 /* protected by key mutex */
Johannes Berg11a843b2007-08-28 17:01:55 -040061 unsigned int flags;
62
Jiri Bencf0706e82007-05-05 11:45:53 -070063 union {
64 struct {
Johannes Berg523b02e2011-07-07 22:28:01 +020065 /* protects tx context */
66 spinlock_t txlock;
67
Jiri Bencf0706e82007-05-05 11:45:53 -070068 /* last used TSC */
Harvey Harrisonb0f76b32008-05-14 16:26:19 -070069 struct tkip_ctx tx;
Jiri Bencf0706e82007-05-05 11:45:53 -070070
71 /* last received RSC */
Johannes Berg5a306f52012-11-14 23:22:21 +010072 struct tkip_ctx rx[IEEE80211_NUM_TIDS];
Saravanab98ea052012-12-04 19:47:42 +053073
74 /* number of mic failures */
75 u32 mic_failures;
Jiri Bencf0706e82007-05-05 11:45:53 -070076 } tkip;
77 struct {
Johannes Bergaba83a0b2011-07-06 21:59:39 +020078 atomic64_t tx_pn;
Jouni Malinen91902522010-06-11 10:27:33 -070079 /*
80 * Last received packet number. The first
Johannes Berg5a306f52012-11-14 23:22:21 +010081 * IEEE80211_NUM_TIDS counters are used with Data
Jouni Malinen91902522010-06-11 10:27:33 -070082 * frames and the last counter is used with Robust
83 * Management frames.
84 */
Johannes Berg4325f6c2013-05-08 13:09:08 +020085 u8 rx_pn[IEEE80211_NUM_TIDS + 1][IEEE80211_CCMP_PN_LEN];
Jiri Bencf0706e82007-05-05 11:45:53 -070086 struct crypto_cipher *tfm;
87 u32 replays; /* dot11RSNAStatsCCMPReplays */
Jiri Bencf0706e82007-05-05 11:45:53 -070088 } ccmp;
Jouni Malinen765cb462009-01-08 13:32:01 +020089 struct {
Johannes Berg75396ae2011-07-06 22:00:35 +020090 atomic64_t tx_pn;
Johannes Berg4325f6c2013-05-08 13:09:08 +020091 u8 rx_pn[IEEE80211_CMAC_PN_LEN];
Jouni Malinen765cb462009-01-08 13:32:01 +020092 struct crypto_cipher *tfm;
93 u32 replays; /* dot11RSNAStatsCMACReplays */
94 u32 icverrors; /* dot11RSNAStatsCMACICVErrors */
Jouni Malinen765cb462009-01-08 13:32:01 +020095 } aes_cmac;
Jiri Bencf0706e82007-05-05 11:45:53 -070096 } u;
Jiri Bencf0706e82007-05-05 11:45:53 -070097
Johannes Berg8f20fc22007-08-28 17:01:54 -040098 /* number of times this key has been used */
99 int tx_rx_count;
Jiri Bencf0706e82007-05-05 11:45:53 -0700100
Jiri Bence9f207f2007-05-05 11:46:38 -0700101#ifdef CONFIG_MAC80211_DEBUGFS
102 struct {
103 struct dentry *stalink;
104 struct dentry *dir;
Johannes Bergd9c58f32008-04-08 16:46:36 -0400105 int cnt;
Jiri Bence9f207f2007-05-05 11:46:38 -0700106 } debugfs;
107#endif
108
Johannes Berg8f20fc22007-08-28 17:01:54 -0400109 /*
110 * key config, must be last because it contains key
111 * material as variable length member
112 */
113 struct ieee80211_key_conf conf;
Jiri Bencf0706e82007-05-05 11:45:53 -0700114};
115
Johannes Berg97359d12010-08-10 09:46:38 +0200116struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300117 const u8 *key_data,
118 size_t seq_len, const u8 *seq);
Johannes Bergdb4d1162008-02-25 16:27:45 +0100119/*
120 * Insert a key into data structures (sdata, sta if necessary)
Johannes Berg79cf2df2013-03-06 22:53:52 +0100121 * to make it used, free old key. On failure, also free the new key.
Johannes Bergdb4d1162008-02-25 16:27:45 +0100122 */
Johannes Berg79cf2df2013-03-06 22:53:52 +0100123int ieee80211_key_link(struct ieee80211_key *key,
124 struct ieee80211_sub_if_data *sdata,
125 struct sta_info *sta);
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100126void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
Johannes Berg79cf2df2013-03-06 22:53:52 +0100127void ieee80211_key_free_unused(struct ieee80211_key *key);
Johannes Bergf7e01042010-12-09 19:49:02 +0100128void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
129 bool uni, bool multi);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200130void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
131 int idx);
Johannes Berg11a843b2007-08-28 17:01:55 -0400132void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata);
Johannes Berg6d10e462013-03-06 23:09:11 +0100133void ieee80211_free_sta_keys(struct ieee80211_local *local,
134 struct sta_info *sta);
Johannes Berg11a843b2007-08-28 17:01:55 -0400135void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
Johannes Berg11a843b2007-08-28 17:01:55 -0400136
Johannes Berg40b275b2011-05-13 14:15:49 +0200137#define key_mtx_dereference(local, ref) \
138 rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
139
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100140void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
141
Jiri Bencf0706e82007-05-05 11:45:53 -0700142#endif /* IEEE80211_KEY_H */