Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 3 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 5 | * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net> |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 12 | #include <linux/if_ether.h> |
| 13 | #include <linux/etherdevice.h> |
| 14 | #include <linux/list.h> |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 15 | #include <linux/rcupdate.h> |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 16 | #include <linux/rtnetlink.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 18 | #include <net/mac80211.h> |
| 19 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 20 | #include "driver-ops.h" |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 21 | #include "debugfs_key.h" |
| 22 | #include "aes_ccm.h" |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 23 | #include "aes_cmac.h" |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 24 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 25 | |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 26 | /** |
| 27 | * DOC: Key handling basics |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 28 | * |
| 29 | * Key handling in mac80211 is done based on per-interface (sub_if_data) |
| 30 | * keys and per-station keys. Since each station belongs to an interface, |
| 31 | * each station key also belongs to that interface. |
| 32 | * |
| 33 | * Hardware acceleration is done on a best-effort basis, for each key |
| 34 | * that is eligible the hardware is asked to enable that key but if |
| 35 | * it cannot do that they key is simply kept for software encryption. |
| 36 | * There is currently no way of knowing this except by looking into |
| 37 | * debugfs. |
| 38 | * |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 39 | * All key operations are protected internally. |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 40 | * |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 41 | * Within mac80211, key references are, just as STA structure references, |
| 42 | * protected by RCU. Note, however, that some things are unprotected, |
| 43 | * namely the key->sta dereferences within the hardware acceleration |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 44 | * functions. This means that sta_info_destroy() must remove the key |
| 45 | * which waits for an RCU grace period. |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 46 | */ |
| 47 | |
| 48 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 49 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 50 | static void assert_key_lock(struct ieee80211_local *local) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 51 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 52 | WARN_ON(!mutex_is_locked(&local->key_mtx)); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 53 | } |
| 54 | |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 55 | static struct ieee80211_sta *get_sta_for_key(struct ieee80211_key *key) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 56 | { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 57 | if (key->sta) |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 58 | return &key->sta->sta; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 59 | |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 60 | return NULL; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
| 64 | { |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 65 | struct ieee80211_sub_if_data *sdata; |
| 66 | struct ieee80211_sta *sta; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 67 | int ret; |
| 68 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 69 | might_sleep(); |
| 70 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 71 | if (!key->local->ops->set_key) |
| 72 | return; |
| 73 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 74 | assert_key_lock(key->local); |
| 75 | |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 76 | sta = get_sta_for_key(key); |
| 77 | |
| 78 | sdata = key->sdata; |
| 79 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| 80 | sdata = container_of(sdata->bss, |
| 81 | struct ieee80211_sub_if_data, |
| 82 | u.ap); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 83 | |
Johannes Berg | 12375ef | 2009-11-25 20:30:31 +0100 | [diff] [blame] | 84 | ret = drv_set_key(key->local, SET_KEY, sdata, sta, &key->conf); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 85 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 86 | if (!ret) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 87 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
| 88 | |
| 89 | if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP) |
| 90 | printk(KERN_ERR "mac80211-%s: failed to set key " |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 91 | "(%d, %pM) to hardware (%d)\n", |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 92 | wiphy_name(key->local->hw.wiphy), |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 93 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) |
| 97 | { |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 98 | struct ieee80211_sub_if_data *sdata; |
| 99 | struct ieee80211_sta *sta; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 100 | int ret; |
| 101 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 102 | might_sleep(); |
| 103 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 104 | if (!key || !key->local->ops->set_key) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 105 | return; |
| 106 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 107 | assert_key_lock(key->local); |
| 108 | |
| 109 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 110 | return; |
| 111 | |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 112 | sta = get_sta_for_key(key); |
| 113 | sdata = key->sdata; |
| 114 | |
| 115 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| 116 | sdata = container_of(sdata->bss, |
| 117 | struct ieee80211_sub_if_data, |
| 118 | u.ap); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 119 | |
Johannes Berg | 12375ef | 2009-11-25 20:30:31 +0100 | [diff] [blame] | 120 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 121 | sta, &key->conf); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 122 | |
| 123 | if (ret) |
| 124 | printk(KERN_ERR "mac80211-%s: failed to remove key " |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 125 | "(%d, %pM) from hardware (%d)\n", |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 126 | wiphy_name(key->local->hw.wiphy), |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 127 | key->conf.keyidx, sta ? sta->addr : bcast_addr, ret); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 128 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 129 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
| 133 | int idx) |
| 134 | { |
| 135 | struct ieee80211_key *key = NULL; |
| 136 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 137 | assert_key_lock(sdata->local); |
| 138 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 139 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
| 140 | key = sdata->keys[idx]; |
| 141 | |
| 142 | rcu_assign_pointer(sdata->default_key, key); |
| 143 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 144 | if (key) { |
| 145 | ieee80211_debugfs_key_remove_default(key->sdata); |
| 146 | ieee80211_debugfs_key_add_default(key->sdata); |
| 147 | } |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx) |
| 151 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 152 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 153 | __ieee80211_set_default_key(sdata, idx); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 154 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 155 | } |
| 156 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 157 | static void |
| 158 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) |
| 159 | { |
| 160 | struct ieee80211_key *key = NULL; |
| 161 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 162 | assert_key_lock(sdata->local); |
| 163 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 164 | if (idx >= NUM_DEFAULT_KEYS && |
| 165 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
| 166 | key = sdata->keys[idx]; |
| 167 | |
| 168 | rcu_assign_pointer(sdata->default_mgmt_key, key); |
| 169 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 170 | if (key) { |
| 171 | ieee80211_debugfs_key_remove_mgmt_default(key->sdata); |
| 172 | ieee80211_debugfs_key_add_mgmt_default(key->sdata); |
| 173 | } |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, |
| 177 | int idx) |
| 178 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 179 | mutex_lock(&sdata->local->key_mtx); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 180 | __ieee80211_set_default_mgmt_key(sdata, idx); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 181 | mutex_unlock(&sdata->local->key_mtx); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 182 | } |
| 183 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 184 | |
| 185 | static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
| 186 | struct sta_info *sta, |
| 187 | struct ieee80211_key *old, |
| 188 | struct ieee80211_key *new) |
| 189 | { |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 190 | int idx, defkey, defmgmtkey; |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 191 | |
| 192 | if (new) |
| 193 | list_add(&new->list, &sdata->key_list); |
| 194 | |
| 195 | if (sta) { |
| 196 | rcu_assign_pointer(sta->key, new); |
| 197 | } else { |
| 198 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
| 199 | |
| 200 | if (old) |
| 201 | idx = old->conf.keyidx; |
| 202 | else |
| 203 | idx = new->conf.keyidx; |
| 204 | |
| 205 | defkey = old && sdata->default_key == old; |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 206 | defmgmtkey = old && sdata->default_mgmt_key == old; |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 207 | |
| 208 | if (defkey && !new) |
| 209 | __ieee80211_set_default_key(sdata, -1); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 210 | if (defmgmtkey && !new) |
| 211 | __ieee80211_set_default_mgmt_key(sdata, -1); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 212 | |
| 213 | rcu_assign_pointer(sdata->keys[idx], new); |
| 214 | if (defkey && new) |
| 215 | __ieee80211_set_default_key(sdata, new->conf.keyidx); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 216 | if (defmgmtkey && new) |
| 217 | __ieee80211_set_default_mgmt_key(sdata, |
| 218 | new->conf.keyidx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | if (old) { |
| 222 | /* |
| 223 | * We'll use an empty list to indicate that the key |
| 224 | * has already been removed. |
| 225 | */ |
| 226 | list_del_init(&old->list); |
| 227 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 228 | } |
| 229 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 230 | struct ieee80211_key *ieee80211_key_alloc(enum ieee80211_key_alg alg, |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 231 | int idx, |
| 232 | size_t key_len, |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 233 | const u8 *key_data, |
| 234 | size_t seq_len, const u8 *seq) |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 235 | { |
| 236 | struct ieee80211_key *key; |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 237 | int i, j; |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 238 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 239 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 240 | |
| 241 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 242 | if (!key) |
| 243 | return NULL; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 244 | |
| 245 | /* |
| 246 | * Default to software encryption; we'll later upload the |
| 247 | * key to the hardware if possible. |
| 248 | */ |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 249 | key->conf.flags = 0; |
| 250 | key->flags = 0; |
| 251 | |
| 252 | key->conf.alg = alg; |
| 253 | key->conf.keyidx = idx; |
| 254 | key->conf.keylen = key_len; |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 255 | switch (alg) { |
| 256 | case ALG_WEP: |
| 257 | key->conf.iv_len = WEP_IV_LEN; |
| 258 | key->conf.icv_len = WEP_ICV_LEN; |
| 259 | break; |
| 260 | case ALG_TKIP: |
| 261 | key->conf.iv_len = TKIP_IV_LEN; |
| 262 | key->conf.icv_len = TKIP_ICV_LEN; |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 263 | if (seq) { |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 264 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { |
| 265 | key->u.tkip.rx[i].iv32 = |
| 266 | get_unaligned_le32(&seq[2]); |
| 267 | key->u.tkip.rx[i].iv16 = |
| 268 | get_unaligned_le16(seq); |
| 269 | } |
| 270 | } |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 271 | break; |
| 272 | case ALG_CCMP: |
| 273 | key->conf.iv_len = CCMP_HDR_LEN; |
| 274 | key->conf.icv_len = CCMP_MIC_LEN; |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 275 | if (seq) { |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 276 | for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 277 | for (j = 0; j < CCMP_PN_LEN; j++) |
| 278 | key->u.ccmp.rx_pn[i][j] = |
| 279 | seq[CCMP_PN_LEN - j - 1]; |
| 280 | } |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 281 | break; |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 282 | case ALG_AES_CMAC: |
| 283 | key->conf.iv_len = 0; |
| 284 | key->conf.icv_len = sizeof(struct ieee80211_mmie); |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 285 | if (seq) |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 286 | for (j = 0; j < 6; j++) |
| 287 | key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 288 | break; |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 289 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 290 | memcpy(key->conf.key, key_data, key_len); |
Johannes Berg | e4861829 | 2008-02-27 13:39:00 +0100 | [diff] [blame] | 291 | INIT_LIST_HEAD(&key->list); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 292 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 293 | if (alg == ALG_CCMP) { |
| 294 | /* |
| 295 | * Initialize AES key state here as an optimization so that |
| 296 | * it does not need to be initialized for every packet. |
| 297 | */ |
| 298 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); |
| 299 | if (!key->u.ccmp.tfm) { |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 300 | kfree(key); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 301 | return NULL; |
| 302 | } |
| 303 | } |
| 304 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 305 | if (alg == ALG_AES_CMAC) { |
| 306 | /* |
| 307 | * Initialize AES key state here as an optimization so that |
| 308 | * it does not need to be initialized for every packet. |
| 309 | */ |
| 310 | key->u.aes_cmac.tfm = |
| 311 | ieee80211_aes_cmac_key_setup(key_data); |
| 312 | if (!key->u.aes_cmac.tfm) { |
| 313 | kfree(key); |
| 314 | return NULL; |
| 315 | } |
| 316 | } |
| 317 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 318 | return key; |
| 319 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 320 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 321 | static void __ieee80211_key_destroy(struct ieee80211_key *key) |
| 322 | { |
| 323 | if (!key) |
| 324 | return; |
| 325 | |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 326 | if (key->local) |
| 327 | ieee80211_key_disable_hw_accel(key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 328 | |
| 329 | if (key->conf.alg == ALG_CCMP) |
| 330 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
| 331 | if (key->conf.alg == ALG_AES_CMAC) |
| 332 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 333 | if (key->local) |
| 334 | ieee80211_debugfs_key_remove(key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 335 | |
| 336 | kfree(key); |
| 337 | } |
| 338 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 339 | void ieee80211_key_link(struct ieee80211_key *key, |
| 340 | struct ieee80211_sub_if_data *sdata, |
| 341 | struct sta_info *sta) |
| 342 | { |
| 343 | struct ieee80211_key *old_key; |
| 344 | int idx; |
| 345 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 346 | BUG_ON(!sdata); |
| 347 | BUG_ON(!key); |
| 348 | |
| 349 | idx = key->conf.keyidx; |
| 350 | key->local = sdata->local; |
| 351 | key->sdata = sdata; |
| 352 | key->sta = sta; |
| 353 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 354 | if (sta) { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 355 | /* |
| 356 | * some hardware cannot handle TKIP with QoS, so |
| 357 | * we indicate whether QoS could be in use. |
| 358 | */ |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 359 | if (test_sta_flags(sta, WLAN_STA_WME)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 360 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; |
Ivo van Doorn | c6adbd2 | 2008-04-17 21:11:18 +0200 | [diff] [blame] | 361 | |
| 362 | /* |
| 363 | * This key is for a specific sta interface, |
| 364 | * inform the driver that it should try to store |
| 365 | * this key as pairwise key. |
| 366 | */ |
| 367 | key->conf.flags |= IEEE80211_KEY_FLAG_PAIRWISE; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 368 | } else { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 369 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 370 | struct sta_info *ap; |
| 371 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 372 | /* |
| 373 | * We're getting a sta pointer in, |
| 374 | * so must be under RCU read lock. |
| 375 | */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 376 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 377 | /* same here, the AP could be using QoS */ |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 378 | ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 379 | if (ap) { |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 380 | if (test_sta_flags(ap, WLAN_STA_WME)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 381 | key->conf.flags |= |
| 382 | IEEE80211_KEY_FLAG_WMM_STA; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 383 | } |
| 384 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 385 | } |
| 386 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 387 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 388 | |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 389 | if (sta) |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 390 | old_key = sta->key; |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 391 | else |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 392 | old_key = sdata->keys[idx]; |
| 393 | |
| 394 | __ieee80211_key_replace(sdata, sta, old_key, key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 395 | __ieee80211_key_destroy(old_key); |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 396 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 397 | ieee80211_debugfs_key_add(key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 398 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 399 | ieee80211_key_enable_hw_accel(key); |
Johannes Berg | 523d2f6 | 2009-07-01 21:26:43 +0200 | [diff] [blame] | 400 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 401 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | static void __ieee80211_key_free(struct ieee80211_key *key) |
| 405 | { |
| 406 | /* |
| 407 | * Replace key with nothingness if it was ever used. |
| 408 | */ |
| 409 | if (key->sdata) |
| 410 | __ieee80211_key_replace(key->sdata, key->sta, |
| 411 | key, NULL); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 412 | __ieee80211_key_destroy(key); |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 413 | } |
| 414 | |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 415 | void ieee80211_key_free(struct ieee80211_local *local, |
| 416 | struct ieee80211_key *key) |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 417 | { |
Johannes Berg | 8f37171 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 418 | if (!key) |
| 419 | return; |
| 420 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 421 | mutex_lock(&local->key_mtx); |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 422 | __ieee80211_key_free(key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 423 | mutex_unlock(&local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
| 427 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 428 | struct ieee80211_key *key; |
| 429 | |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 430 | ASSERT_RTNL(); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 431 | |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 432 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 433 | return; |
| 434 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 435 | mutex_lock(&sdata->local->key_mtx); |
| 436 | |
| 437 | list_for_each_entry(key, &sdata->key_list, list) |
| 438 | ieee80211_key_enable_hw_accel(key); |
| 439 | |
| 440 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) |
| 444 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 445 | struct ieee80211_key *key; |
| 446 | |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 447 | ASSERT_RTNL(); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 448 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 449 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 450 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 451 | list_for_each_entry(key, &sdata->key_list, list) |
| 452 | ieee80211_key_disable_hw_accel(key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 453 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 454 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
| 458 | { |
| 459 | struct ieee80211_key *key, *tmp; |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 460 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 461 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 462 | |
| 463 | ieee80211_debugfs_key_remove_default(sdata); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 464 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 465 | |
| 466 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 467 | __ieee80211_key_free(key); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 468 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 469 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 470 | } |