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> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 18 | #include <linux/export.h> |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 19 | #include <net/mac80211.h> |
Johannes Berg | d26ad37 | 2012-02-20 11:38:41 +0100 | [diff] [blame] | 20 | #include <asm/unaligned.h> |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 21 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 22 | #include "driver-ops.h" |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 23 | #include "debugfs_key.h" |
| 24 | #include "aes_ccm.h" |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 25 | #include "aes_cmac.h" |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 26 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 27 | |
Johannes Berg | dbbea67 | 2008-02-26 14:34:06 +0100 | [diff] [blame] | 28 | /** |
| 29 | * DOC: Key handling basics |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 30 | * |
| 31 | * Key handling in mac80211 is done based on per-interface (sub_if_data) |
| 32 | * keys and per-station keys. Since each station belongs to an interface, |
| 33 | * each station key also belongs to that interface. |
| 34 | * |
Johannes Berg | b5c34f6 | 2011-01-03 19:51:09 +0100 | [diff] [blame] | 35 | * Hardware acceleration is done on a best-effort basis for algorithms |
| 36 | * that are implemented in software, for each key the hardware is asked |
| 37 | * to enable that key for offloading but if it cannot do that the key is |
| 38 | * simply kept for software encryption (unless it is for an algorithm |
| 39 | * that isn't implemented in software). |
| 40 | * There is currently no way of knowing whether a key is handled in SW |
| 41 | * or HW except by looking into debugfs. |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 42 | * |
Johannes Berg | b5c34f6 | 2011-01-03 19:51:09 +0100 | [diff] [blame] | 43 | * All key management is internally protected by a mutex. Within all |
| 44 | * other parts of mac80211, key references are, just as STA structure |
| 45 | * references, protected by RCU. Note, however, that some things are |
| 46 | * unprotected, namely the key->sta dereferences within the hardware |
| 47 | * acceleration functions. This means that sta_info_destroy() must |
| 48 | * remove the key which waits for an RCU grace period. |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 49 | */ |
| 50 | |
| 51 | 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] | 52 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 53 | static void assert_key_lock(struct ieee80211_local *local) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 54 | { |
Johannes Berg | 46a5eba | 2010-09-15 13:28:15 +0200 | [diff] [blame] | 55 | lockdep_assert_held(&local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 56 | } |
| 57 | |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 58 | static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata) |
| 59 | { |
| 60 | /* |
| 61 | * When this count is zero, SKB resizing for allocating tailroom |
| 62 | * for IV or MMIC is skipped. But, this check has created two race |
| 63 | * cases in xmit path while transiting from zero count to one: |
| 64 | * |
| 65 | * 1. SKB resize was skipped because no key was added but just before |
| 66 | * the xmit key is added and SW encryption kicks off. |
| 67 | * |
| 68 | * 2. SKB resize was skipped because all the keys were hw planted but |
| 69 | * just before xmit one of the key is deleted and SW encryption kicks |
| 70 | * off. |
| 71 | * |
| 72 | * In both the above case SW encryption will find not enough space for |
| 73 | * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c) |
| 74 | * |
| 75 | * Solution has been explained at |
| 76 | * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net |
| 77 | */ |
| 78 | |
| 79 | if (!sdata->crypto_tx_tailroom_needed_cnt++) { |
| 80 | /* |
| 81 | * Flush all XMIT packets currently using HW encryption or no |
| 82 | * encryption at all if the count transition is from 0 -> 1. |
| 83 | */ |
| 84 | synchronize_net(); |
| 85 | } |
| 86 | } |
| 87 | |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 88 | static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 89 | { |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 90 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 91 | struct sta_info *sta; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 92 | int ret; |
| 93 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 94 | might_sleep(); |
| 95 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 96 | if (!key->local->ops->set_key) |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 97 | goto out_unsupported; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 98 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 99 | assert_key_lock(key->local); |
| 100 | |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 101 | sta = key->sta; |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 102 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 103 | /* |
| 104 | * If this is a per-STA GTK, check if it |
| 105 | * is supported; if not, return. |
| 106 | */ |
| 107 | if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) && |
| 108 | !(key->local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)) |
| 109 | goto out_unsupported; |
| 110 | |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 111 | if (sta && !sta->uploaded) |
| 112 | goto out_unsupported; |
| 113 | |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 114 | sdata = key->sdata; |
Helmut Schaa | 18890d4 | 2010-11-19 08:11:01 +0100 | [diff] [blame] | 115 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { |
| 116 | /* |
| 117 | * The driver doesn't know anything about VLAN interfaces. |
| 118 | * Hence, don't send GTKs for VLAN interfaces to the driver. |
| 119 | */ |
| 120 | if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) |
| 121 | goto out_unsupported; |
Helmut Schaa | 18890d4 | 2010-11-19 08:11:01 +0100 | [diff] [blame] | 122 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 123 | |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 124 | ret = drv_set_key(key->local, SET_KEY, sdata, |
| 125 | sta ? &sta->sta : NULL, &key->conf); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 126 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 127 | if (!ret) { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 128 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 129 | |
| 130 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
Arik Nemtsov | 077a915 | 2011-10-23 08:21:41 +0200 | [diff] [blame] | 131 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
| 132 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 133 | sdata->crypto_tx_tailroom_needed_cnt--; |
| 134 | |
Arik Nemtsov | 077a915 | 2011-10-23 08:21:41 +0200 | [diff] [blame] | 135 | WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
| 136 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)); |
| 137 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 138 | return 0; |
| 139 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 140 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 141 | if (ret != -ENOSPC && ret != -EOPNOTSUPP) |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 142 | sdata_err(sdata, |
Joe Perches | 0fb9a9e | 2010-08-20 16:25:38 -0700 | [diff] [blame] | 143 | "failed to set key (%d, %pM) to hardware (%d)\n", |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 144 | key->conf.keyidx, |
| 145 | sta ? sta->sta.addr : bcast_addr, ret); |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 146 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 147 | out_unsupported: |
| 148 | switch (key->conf.cipher) { |
| 149 | case WLAN_CIPHER_SUITE_WEP40: |
| 150 | case WLAN_CIPHER_SUITE_WEP104: |
| 151 | case WLAN_CIPHER_SUITE_TKIP: |
| 152 | case WLAN_CIPHER_SUITE_CCMP: |
| 153 | case WLAN_CIPHER_SUITE_AES_CMAC: |
| 154 | /* all of these we can do in software */ |
| 155 | return 0; |
| 156 | default: |
| 157 | return -EINVAL; |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 158 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) |
| 162 | { |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 163 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 164 | struct sta_info *sta; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 165 | int ret; |
| 166 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 167 | might_sleep(); |
| 168 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 169 | if (!key || !key->local->ops->set_key) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 170 | return; |
| 171 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 172 | assert_key_lock(key->local); |
| 173 | |
| 174 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 175 | return; |
| 176 | |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 177 | sta = key->sta; |
Johannes Berg | dc822b5 | 2008-12-29 12:55:09 +0100 | [diff] [blame] | 178 | sdata = key->sdata; |
| 179 | |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 180 | if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) || |
Arik Nemtsov | 077a915 | 2011-10-23 08:21:41 +0200 | [diff] [blame] | 181 | (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) || |
| 182 | (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))) |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 183 | increment_tailroom_need_count(sdata); |
| 184 | |
Johannes Berg | 12375ef | 2009-11-25 20:30:31 +0100 | [diff] [blame] | 185 | ret = drv_set_key(key->local, DISABLE_KEY, sdata, |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 186 | sta ? &sta->sta : NULL, &key->conf); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 187 | |
| 188 | if (ret) |
Johannes Berg | bdcbd8e | 2012-06-22 11:29:50 +0200 | [diff] [blame] | 189 | sdata_err(sdata, |
Joe Perches | 0fb9a9e | 2010-08-20 16:25:38 -0700 | [diff] [blame] | 190 | "failed to remove key (%d, %pM) from hardware (%d)\n", |
Johannes Berg | 89c91ca | 2012-01-20 13:55:19 +0100 | [diff] [blame] | 191 | key->conf.keyidx, |
| 192 | sta ? sta->sta.addr : bcast_addr, ret); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 193 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 194 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 195 | } |
| 196 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 197 | void ieee80211_key_removed(struct ieee80211_key_conf *key_conf) |
| 198 | { |
| 199 | struct ieee80211_key *key; |
| 200 | |
| 201 | key = container_of(key_conf, struct ieee80211_key, conf); |
| 202 | |
| 203 | might_sleep(); |
| 204 | assert_key_lock(key->local); |
| 205 | |
| 206 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; |
| 207 | |
| 208 | /* |
| 209 | * Flush TX path to avoid attempts to use this key |
| 210 | * after this function returns. Until then, drivers |
| 211 | * must be prepared to handle the key. |
| 212 | */ |
| 213 | synchronize_rcu(); |
| 214 | } |
| 215 | EXPORT_SYMBOL_GPL(ieee80211_key_removed); |
| 216 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 217 | static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 218 | int idx, bool uni, bool multi) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 219 | { |
| 220 | struct ieee80211_key *key = NULL; |
| 221 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 222 | assert_key_lock(sdata->local); |
| 223 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 224 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 225 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 226 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 227 | if (uni) |
| 228 | rcu_assign_pointer(sdata->default_unicast_key, key); |
| 229 | if (multi) |
| 230 | rcu_assign_pointer(sdata->default_multicast_key, key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 231 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 232 | ieee80211_debugfs_key_update_default(sdata); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 233 | } |
| 234 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 235 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx, |
| 236 | bool uni, bool multi) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 237 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 238 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 239 | __ieee80211_set_default_key(sdata, idx, uni, multi); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 240 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 241 | } |
| 242 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 243 | static void |
| 244 | __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx) |
| 245 | { |
| 246 | struct ieee80211_key *key = NULL; |
| 247 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 248 | assert_key_lock(sdata->local); |
| 249 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 250 | if (idx >= NUM_DEFAULT_KEYS && |
| 251 | idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 252 | key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 253 | |
| 254 | rcu_assign_pointer(sdata->default_mgmt_key, key); |
| 255 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 256 | ieee80211_debugfs_key_update_default(sdata); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, |
| 260 | int idx) |
| 261 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 262 | mutex_lock(&sdata->local->key_mtx); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 263 | __ieee80211_set_default_mgmt_key(sdata, idx); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 264 | mutex_unlock(&sdata->local->key_mtx); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 265 | } |
| 266 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 267 | |
| 268 | static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, |
| 269 | struct sta_info *sta, |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 270 | bool pairwise, |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 271 | struct ieee80211_key *old, |
| 272 | struct ieee80211_key *new) |
| 273 | { |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 274 | int idx; |
| 275 | bool defunikey, defmultikey, defmgmtkey; |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 276 | |
| 277 | if (new) |
Johannes Berg | f850e00 | 2011-07-13 19:50:53 +0200 | [diff] [blame] | 278 | list_add_tail(&new->list, &sdata->key_list); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 279 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 280 | if (sta && pairwise) { |
| 281 | rcu_assign_pointer(sta->ptk, new); |
| 282 | } else if (sta) { |
| 283 | if (old) |
| 284 | idx = old->conf.keyidx; |
| 285 | else |
| 286 | idx = new->conf.keyidx; |
| 287 | rcu_assign_pointer(sta->gtk[idx], new); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 288 | } else { |
| 289 | WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx); |
| 290 | |
| 291 | if (old) |
| 292 | idx = old->conf.keyidx; |
| 293 | else |
| 294 | idx = new->conf.keyidx; |
| 295 | |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 296 | defunikey = old && |
| 297 | old == key_mtx_dereference(sdata->local, |
| 298 | sdata->default_unicast_key); |
| 299 | defmultikey = old && |
| 300 | old == key_mtx_dereference(sdata->local, |
| 301 | sdata->default_multicast_key); |
| 302 | defmgmtkey = old && |
| 303 | old == key_mtx_dereference(sdata->local, |
| 304 | sdata->default_mgmt_key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 305 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 306 | if (defunikey && !new) |
| 307 | __ieee80211_set_default_key(sdata, -1, true, false); |
| 308 | if (defmultikey && !new) |
| 309 | __ieee80211_set_default_key(sdata, -1, false, true); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 310 | if (defmgmtkey && !new) |
| 311 | __ieee80211_set_default_mgmt_key(sdata, -1); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 312 | |
| 313 | rcu_assign_pointer(sdata->keys[idx], new); |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 314 | if (defunikey && new) |
| 315 | __ieee80211_set_default_key(sdata, new->conf.keyidx, |
| 316 | true, false); |
| 317 | if (defmultikey && new) |
| 318 | __ieee80211_set_default_key(sdata, new->conf.keyidx, |
| 319 | false, true); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 320 | if (defmgmtkey && new) |
| 321 | __ieee80211_set_default_mgmt_key(sdata, |
| 322 | new->conf.keyidx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 323 | } |
| 324 | |
Johannes Berg | b5c34f6 | 2011-01-03 19:51:09 +0100 | [diff] [blame] | 325 | if (old) |
| 326 | list_del(&old->list); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 327 | } |
| 328 | |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 329 | struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len, |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 330 | const u8 *key_data, |
| 331 | size_t seq_len, const u8 *seq) |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 332 | { |
| 333 | struct ieee80211_key *key; |
Ben Hutchings | 1ac62ba | 2010-08-01 17:37:03 +0100 | [diff] [blame] | 334 | int i, j, err; |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 335 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 336 | BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 337 | |
| 338 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 339 | if (!key) |
Ben Hutchings | 1ac62ba | 2010-08-01 17:37:03 +0100 | [diff] [blame] | 340 | return ERR_PTR(-ENOMEM); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 341 | |
| 342 | /* |
| 343 | * Default to software encryption; we'll later upload the |
| 344 | * key to the hardware if possible. |
| 345 | */ |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 346 | key->conf.flags = 0; |
| 347 | key->flags = 0; |
| 348 | |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 349 | key->conf.cipher = cipher; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 350 | key->conf.keyidx = idx; |
| 351 | key->conf.keylen = key_len; |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 352 | switch (cipher) { |
| 353 | case WLAN_CIPHER_SUITE_WEP40: |
| 354 | case WLAN_CIPHER_SUITE_WEP104: |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 355 | key->conf.iv_len = WEP_IV_LEN; |
| 356 | key->conf.icv_len = WEP_ICV_LEN; |
| 357 | break; |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 358 | case WLAN_CIPHER_SUITE_TKIP: |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 359 | key->conf.iv_len = TKIP_IV_LEN; |
| 360 | key->conf.icv_len = TKIP_ICV_LEN; |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 361 | if (seq) { |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 362 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) { |
| 363 | key->u.tkip.rx[i].iv32 = |
| 364 | get_unaligned_le32(&seq[2]); |
| 365 | key->u.tkip.rx[i].iv16 = |
| 366 | get_unaligned_le16(seq); |
| 367 | } |
| 368 | } |
Johannes Berg | 523b02e | 2011-07-07 22:28:01 +0200 | [diff] [blame] | 369 | spin_lock_init(&key->u.tkip.txlock); |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 370 | break; |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 371 | case WLAN_CIPHER_SUITE_CCMP: |
Felix Fietkau | 76708de | 2008-10-05 18:02:48 +0200 | [diff] [blame] | 372 | key->conf.iv_len = CCMP_HDR_LEN; |
| 373 | key->conf.icv_len = CCMP_MIC_LEN; |
Jouni Malinen | 9f26a95 | 2009-05-15 12:38:32 +0300 | [diff] [blame] | 374 | if (seq) { |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 375 | for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++) |
Jouni Malinen | faa8fdc | 2009-05-11 21:57:58 +0300 | [diff] [blame] | 376 | for (j = 0; j < CCMP_PN_LEN; j++) |
| 377 | key->u.ccmp.rx_pn[i][j] = |
| 378 | seq[CCMP_PN_LEN - j - 1]; |
| 379 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 380 | /* |
| 381 | * Initialize AES key state here as an optimization so that |
| 382 | * it does not need to be initialized for every packet. |
| 383 | */ |
| 384 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); |
Ben Hutchings | 1ac62ba | 2010-08-01 17:37:03 +0100 | [diff] [blame] | 385 | if (IS_ERR(key->u.ccmp.tfm)) { |
| 386 | err = PTR_ERR(key->u.ccmp.tfm); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 387 | kfree(key); |
Petr Å tetiar | 1f951a7 | 2011-03-27 13:31:26 +0200 | [diff] [blame] | 388 | return ERR_PTR(err); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 389 | } |
Johannes Berg | 60ae0f2 | 2010-08-10 09:46:39 +0200 | [diff] [blame] | 390 | break; |
| 391 | case WLAN_CIPHER_SUITE_AES_CMAC: |
| 392 | key->conf.iv_len = 0; |
| 393 | key->conf.icv_len = sizeof(struct ieee80211_mmie); |
| 394 | if (seq) |
| 395 | for (j = 0; j < 6; j++) |
| 396 | key->u.aes_cmac.rx_pn[j] = seq[6 - j - 1]; |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 397 | /* |
| 398 | * Initialize AES key state here as an optimization so that |
| 399 | * it does not need to be initialized for every packet. |
| 400 | */ |
| 401 | key->u.aes_cmac.tfm = |
| 402 | ieee80211_aes_cmac_key_setup(key_data); |
Ben Hutchings | 1ac62ba | 2010-08-01 17:37:03 +0100 | [diff] [blame] | 403 | if (IS_ERR(key->u.aes_cmac.tfm)) { |
| 404 | err = PTR_ERR(key->u.aes_cmac.tfm); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 405 | kfree(key); |
Petr Å tetiar | 1f951a7 | 2011-03-27 13:31:26 +0200 | [diff] [blame] | 406 | return ERR_PTR(err); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 407 | } |
Johannes Berg | 60ae0f2 | 2010-08-10 09:46:39 +0200 | [diff] [blame] | 408 | break; |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 409 | } |
Johannes Berg | 60ae0f2 | 2010-08-10 09:46:39 +0200 | [diff] [blame] | 410 | memcpy(key->conf.key, key_data, key_len); |
| 411 | INIT_LIST_HEAD(&key->list); |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 412 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 413 | return key; |
| 414 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 415 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 416 | static void __ieee80211_key_destroy(struct ieee80211_key *key) |
| 417 | { |
| 418 | if (!key) |
| 419 | return; |
| 420 | |
Johannes Berg | d2460f4 | 2011-01-03 19:42:24 +0100 | [diff] [blame] | 421 | /* |
| 422 | * Synchronize so the TX path can no longer be using |
| 423 | * this key before we free/remove it. |
| 424 | */ |
| 425 | synchronize_rcu(); |
| 426 | |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 427 | if (key->local) |
| 428 | ieee80211_key_disable_hw_accel(key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 429 | |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 430 | if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP) |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 431 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
Johannes Berg | 97359d1 | 2010-08-10 09:46:38 +0200 | [diff] [blame] | 432 | if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC) |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 433 | ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm); |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 434 | if (key->local) { |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 435 | ieee80211_debugfs_key_remove(key); |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 436 | key->sdata->crypto_tx_tailroom_needed_cnt--; |
| 437 | } |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 438 | |
| 439 | kfree(key); |
| 440 | } |
| 441 | |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 442 | int ieee80211_key_link(struct ieee80211_key *key, |
| 443 | struct ieee80211_sub_if_data *sdata, |
| 444 | struct sta_info *sta) |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 445 | { |
| 446 | struct ieee80211_key *old_key; |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 447 | int idx, ret; |
Mariusz Kozlowski | 67aa030 | 2011-03-26 18:58:51 +0100 | [diff] [blame] | 448 | bool pairwise; |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 449 | |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 450 | BUG_ON(!sdata); |
| 451 | BUG_ON(!key); |
| 452 | |
Mariusz Kozlowski | 67aa030 | 2011-03-26 18:58:51 +0100 | [diff] [blame] | 453 | pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE; |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 454 | idx = key->conf.keyidx; |
| 455 | key->local = sdata->local; |
| 456 | key->sdata = sdata; |
| 457 | key->sta = sta; |
| 458 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 459 | if (sta) { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 460 | /* |
| 461 | * some hardware cannot handle TKIP with QoS, so |
| 462 | * we indicate whether QoS could be in use. |
| 463 | */ |
Johannes Berg | c2c98fd | 2011-09-29 16:04:36 +0200 | [diff] [blame] | 464 | if (test_sta_flag(sta, WLAN_STA_WME)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 465 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; |
| 466 | } else { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 467 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 468 | struct sta_info *ap; |
| 469 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 470 | /* |
Johannes Berg | b5c34f6 | 2011-01-03 19:51:09 +0100 | [diff] [blame] | 471 | * We're getting a sta pointer in, so must be under |
| 472 | * appropriate locking for sta_info_get(). |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 473 | */ |
Johannes Berg | d0709a6 | 2008-02-25 16:27:46 +0100 | [diff] [blame] | 474 | |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 475 | /* same here, the AP could be using QoS */ |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 476 | ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 477 | if (ap) { |
Johannes Berg | c2c98fd | 2011-09-29 16:04:36 +0200 | [diff] [blame] | 478 | if (test_sta_flag(ap, WLAN_STA_WME)) |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 479 | key->conf.flags |= |
| 480 | IEEE80211_KEY_FLAG_WMM_STA; |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 481 | } |
| 482 | } |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 483 | } |
| 484 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 485 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 486 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 487 | if (sta && pairwise) |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 488 | old_key = key_mtx_dereference(sdata->local, sta->ptk); |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 489 | else if (sta) |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 490 | old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]); |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 491 | else |
Johannes Berg | 40b275b | 2011-05-13 14:15:49 +0200 | [diff] [blame] | 492 | old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]); |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 493 | |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 494 | increment_tailroom_need_count(sdata); |
| 495 | |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 496 | __ieee80211_key_replace(sdata, sta, pairwise, old_key, key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 497 | __ieee80211_key_destroy(old_key); |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 498 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 499 | ieee80211_debugfs_key_add(key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 500 | |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 501 | ret = ieee80211_key_enable_hw_accel(key); |
Johannes Berg | 523d2f6 | 2009-07-01 21:26:43 +0200 | [diff] [blame] | 502 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 503 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3ffc2a9 | 2010-08-27 14:26:52 +0300 | [diff] [blame] | 504 | |
| 505 | return ret; |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 506 | } |
| 507 | |
Johannes Berg | 5c0c364 | 2011-05-12 14:31:49 +0200 | [diff] [blame] | 508 | void __ieee80211_key_free(struct ieee80211_key *key) |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 509 | { |
Johannes Berg | 5c0c364 | 2011-05-12 14:31:49 +0200 | [diff] [blame] | 510 | if (!key) |
| 511 | return; |
| 512 | |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 513 | /* |
| 514 | * Replace key with nothingness if it was ever used. |
| 515 | */ |
| 516 | if (key->sdata) |
| 517 | __ieee80211_key_replace(key->sdata, key->sta, |
Johannes Berg | e31b821 | 2010-10-05 19:39:30 +0200 | [diff] [blame] | 518 | key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE, |
| 519 | key, NULL); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 520 | __ieee80211_key_destroy(key); |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 521 | } |
| 522 | |
Jouni Malinen | 32162a4 | 2010-07-26 15:52:03 -0700 | [diff] [blame] | 523 | void ieee80211_key_free(struct ieee80211_local *local, |
| 524 | struct ieee80211_key *key) |
Johannes Berg | 1f5a7e47 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 525 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 526 | mutex_lock(&local->key_mtx); |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 527 | __ieee80211_key_free(key); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 528 | mutex_unlock(&local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) |
| 532 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 533 | struct ieee80211_key *key; |
| 534 | |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 535 | ASSERT_RTNL(); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 536 | |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 537 | if (WARN_ON(!ieee80211_sdata_running(sdata))) |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 538 | return; |
| 539 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 540 | mutex_lock(&sdata->local->key_mtx); |
| 541 | |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 542 | sdata->crypto_tx_tailroom_needed_cnt = 0; |
| 543 | |
| 544 | list_for_each_entry(key, &sdata->key_list, list) { |
| 545 | increment_tailroom_need_count(sdata); |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 546 | ieee80211_key_enable_hw_accel(key); |
Yogesh Ashok Powar | 3bff186 | 2011-06-28 18:41:37 +0530 | [diff] [blame] | 547 | } |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 548 | |
| 549 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 550 | } |
| 551 | |
Johannes Berg | 830af02 | 2011-07-05 16:35:39 +0200 | [diff] [blame] | 552 | void ieee80211_iter_keys(struct ieee80211_hw *hw, |
| 553 | struct ieee80211_vif *vif, |
| 554 | void (*iter)(struct ieee80211_hw *hw, |
| 555 | struct ieee80211_vif *vif, |
| 556 | struct ieee80211_sta *sta, |
| 557 | struct ieee80211_key_conf *key, |
| 558 | void *data), |
| 559 | void *iter_data) |
| 560 | { |
| 561 | struct ieee80211_local *local = hw_to_local(hw); |
| 562 | struct ieee80211_key *key; |
| 563 | struct ieee80211_sub_if_data *sdata; |
| 564 | |
| 565 | ASSERT_RTNL(); |
| 566 | |
| 567 | mutex_lock(&local->key_mtx); |
| 568 | if (vif) { |
| 569 | sdata = vif_to_sdata(vif); |
| 570 | list_for_each_entry(key, &sdata->key_list, list) |
| 571 | iter(hw, &sdata->vif, |
| 572 | key->sta ? &key->sta->sta : NULL, |
| 573 | &key->conf, iter_data); |
| 574 | } else { |
| 575 | list_for_each_entry(sdata, &local->interfaces, list) |
| 576 | list_for_each_entry(key, &sdata->key_list, list) |
| 577 | iter(hw, &sdata->vif, |
| 578 | key->sta ? &key->sta->sta : NULL, |
| 579 | &key->conf, iter_data); |
| 580 | } |
| 581 | mutex_unlock(&local->key_mtx); |
| 582 | } |
| 583 | EXPORT_SYMBOL(ieee80211_iter_keys); |
| 584 | |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 585 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) |
| 586 | { |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 587 | struct ieee80211_key *key; |
| 588 | |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 589 | ASSERT_RTNL(); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 590 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 591 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 592 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 593 | list_for_each_entry(key, &sdata->key_list, list) |
| 594 | ieee80211_key_disable_hw_accel(key); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 595 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 596 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) |
| 600 | { |
| 601 | struct ieee80211_key *key, *tmp; |
Johannes Berg | db4d116 | 2008-02-25 16:27:45 +0100 | [diff] [blame] | 602 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 603 | mutex_lock(&sdata->local->key_mtx); |
Johannes Berg | 3b96766 | 2008-04-08 17:56:52 +0200 | [diff] [blame] | 604 | |
Jouni Malinen | 3cfcf6ac | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 605 | ieee80211_debugfs_key_remove_mgmt_default(sdata); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 606 | |
| 607 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) |
Johannes Berg | 3a24576 | 2008-04-09 16:45:37 +0200 | [diff] [blame] | 608 | __ieee80211_key_free(key); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 609 | |
Johannes Berg | f7e0104 | 2010-12-09 19:49:02 +0100 | [diff] [blame] | 610 | ieee80211_debugfs_key_update_default(sdata); |
| 611 | |
Johannes Berg | ad0e2b5 | 2010-06-01 10:19:19 +0200 | [diff] [blame] | 612 | mutex_unlock(&sdata->local->key_mtx); |
Johannes Berg | 11a843b | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 613 | } |
Johannes Berg | c68f4b8 | 2011-07-05 16:35:41 +0200 | [diff] [blame] | 614 | |
| 615 | |
| 616 | void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid, |
| 617 | const u8 *replay_ctr, gfp_t gfp) |
| 618 | { |
| 619 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| 620 | |
| 621 | trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr); |
| 622 | |
| 623 | cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp); |
| 624 | } |
| 625 | EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify); |
Johannes Berg | 3ea542d | 2011-07-07 18:58:00 +0200 | [diff] [blame] | 626 | |
| 627 | void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf, |
| 628 | struct ieee80211_key_seq *seq) |
| 629 | { |
| 630 | struct ieee80211_key *key; |
| 631 | u64 pn64; |
| 632 | |
| 633 | if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV))) |
| 634 | return; |
| 635 | |
| 636 | key = container_of(keyconf, struct ieee80211_key, conf); |
| 637 | |
| 638 | switch (key->conf.cipher) { |
| 639 | case WLAN_CIPHER_SUITE_TKIP: |
| 640 | seq->tkip.iv32 = key->u.tkip.tx.iv32; |
| 641 | seq->tkip.iv16 = key->u.tkip.tx.iv16; |
| 642 | break; |
| 643 | case WLAN_CIPHER_SUITE_CCMP: |
| 644 | pn64 = atomic64_read(&key->u.ccmp.tx_pn); |
| 645 | seq->ccmp.pn[5] = pn64; |
| 646 | seq->ccmp.pn[4] = pn64 >> 8; |
| 647 | seq->ccmp.pn[3] = pn64 >> 16; |
| 648 | seq->ccmp.pn[2] = pn64 >> 24; |
| 649 | seq->ccmp.pn[1] = pn64 >> 32; |
| 650 | seq->ccmp.pn[0] = pn64 >> 40; |
| 651 | break; |
| 652 | case WLAN_CIPHER_SUITE_AES_CMAC: |
| 653 | pn64 = atomic64_read(&key->u.aes_cmac.tx_pn); |
| 654 | seq->ccmp.pn[5] = pn64; |
| 655 | seq->ccmp.pn[4] = pn64 >> 8; |
| 656 | seq->ccmp.pn[3] = pn64 >> 16; |
| 657 | seq->ccmp.pn[2] = pn64 >> 24; |
| 658 | seq->ccmp.pn[1] = pn64 >> 32; |
| 659 | seq->ccmp.pn[0] = pn64 >> 40; |
| 660 | break; |
| 661 | default: |
| 662 | WARN_ON(1); |
| 663 | } |
| 664 | } |
| 665 | EXPORT_SYMBOL(ieee80211_get_key_tx_seq); |
| 666 | |
| 667 | void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf, |
| 668 | int tid, struct ieee80211_key_seq *seq) |
| 669 | { |
| 670 | struct ieee80211_key *key; |
| 671 | const u8 *pn; |
| 672 | |
| 673 | key = container_of(keyconf, struct ieee80211_key, conf); |
| 674 | |
| 675 | switch (key->conf.cipher) { |
| 676 | case WLAN_CIPHER_SUITE_TKIP: |
| 677 | if (WARN_ON(tid < 0 || tid >= NUM_RX_DATA_QUEUES)) |
| 678 | return; |
| 679 | seq->tkip.iv32 = key->u.tkip.rx[tid].iv32; |
| 680 | seq->tkip.iv16 = key->u.tkip.rx[tid].iv16; |
| 681 | break; |
| 682 | case WLAN_CIPHER_SUITE_CCMP: |
| 683 | if (WARN_ON(tid < -1 || tid >= NUM_RX_DATA_QUEUES)) |
| 684 | return; |
| 685 | if (tid < 0) |
| 686 | pn = key->u.ccmp.rx_pn[NUM_RX_DATA_QUEUES]; |
| 687 | else |
| 688 | pn = key->u.ccmp.rx_pn[tid]; |
| 689 | memcpy(seq->ccmp.pn, pn, CCMP_PN_LEN); |
| 690 | break; |
| 691 | case WLAN_CIPHER_SUITE_AES_CMAC: |
| 692 | if (WARN_ON(tid != 0)) |
| 693 | return; |
| 694 | pn = key->u.aes_cmac.rx_pn; |
| 695 | memcpy(seq->aes_cmac.pn, pn, CMAC_PN_LEN); |
| 696 | break; |
| 697 | } |
| 698 | } |
| 699 | EXPORT_SYMBOL(ieee80211_get_key_rx_seq); |