blob: 5e5bc599da4c8cc42639f6cbec7de47ea24925bc [file] [log] [blame]
Johannes Berg1f5a7e42007-07-27 15:43:23 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg3b967662008-04-08 17:56:52 +02005 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2013-2014 Intel Mobile Communications GmbH
Eliad Pelleref044762015-11-17 10:24:37 +02007 * Copyright 2015 Intel Deutschland GmbH
Johannes Berg1f5a7e42007-07-27 15:43:23 +02008 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
Johannes Berg11a843b2007-08-28 17:01:55 -040014#include <linux/if_ether.h>
15#include <linux/etherdevice.h>
16#include <linux/list.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040017#include <linux/rcupdate.h>
Johannes Bergdb4d1162008-02-25 16:27:45 +010018#include <linux/rtnetlink.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040020#include <linux/export.h>
Johannes Berg1f5a7e42007-07-27 15:43:23 +020021#include <net/mac80211.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010022#include <asm/unaligned.h>
Johannes Berg1f5a7e42007-07-27 15:43:23 +020023#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020024#include "driver-ops.h"
Johannes Berg1f5a7e42007-07-27 15:43:23 +020025#include "debugfs_key.h"
26#include "aes_ccm.h"
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +020027#include "aes_cmac.h"
Jouni Malinen8ade5382015-01-24 19:52:09 +020028#include "aes_gmac.h"
Jouni Malinen00b9cfa2015-01-24 19:52:06 +020029#include "aes_gcm.h"
Johannes Berg1f5a7e42007-07-27 15:43:23 +020030
Johannes Berg11a843b2007-08-28 17:01:55 -040031
Johannes Bergdbbea672008-02-26 14:34:06 +010032/**
33 * DOC: Key handling basics
Johannes Berg11a843b2007-08-28 17:01:55 -040034 *
35 * Key handling in mac80211 is done based on per-interface (sub_if_data)
36 * keys and per-station keys. Since each station belongs to an interface,
37 * each station key also belongs to that interface.
38 *
Johannes Bergb5c34f62011-01-03 19:51:09 +010039 * Hardware acceleration is done on a best-effort basis for algorithms
40 * that are implemented in software, for each key the hardware is asked
41 * to enable that key for offloading but if it cannot do that the key is
42 * simply kept for software encryption (unless it is for an algorithm
43 * that isn't implemented in software).
44 * There is currently no way of knowing whether a key is handled in SW
45 * or HW except by looking into debugfs.
Johannes Berg11a843b2007-08-28 17:01:55 -040046 *
Johannes Bergb5c34f62011-01-03 19:51:09 +010047 * All key management is internally protected by a mutex. Within all
48 * other parts of mac80211, key references are, just as STA structure
49 * references, protected by RCU. Note, however, that some things are
50 * unprotected, namely the key->sta dereferences within the hardware
51 * acceleration functions. This means that sta_info_destroy() must
52 * remove the key which waits for an RCU grace period.
Johannes Berg11a843b2007-08-28 17:01:55 -040053 */
54
55static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
Johannes Berg11a843b2007-08-28 17:01:55 -040056
Johannes Bergad0e2b52010-06-01 10:19:19 +020057static void assert_key_lock(struct ieee80211_local *local)
Johannes Berg3b967662008-04-08 17:56:52 +020058{
Johannes Berg46a5eba2010-09-15 13:28:15 +020059 lockdep_assert_held(&local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +020060}
61
Michal Kaziorf9dca802015-05-13 09:16:48 +000062static void
63update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
64{
65 struct ieee80211_sub_if_data *vlan;
66
67 if (sdata->vif.type != NL80211_IFTYPE_AP)
68 return;
69
Johannes Berg51f458d2015-06-17 13:54:54 +020070 /* crypto_tx_tailroom_needed_cnt is protected by this */
71 assert_key_lock(sdata->local);
Michal Kaziorf9dca802015-05-13 09:16:48 +000072
Johannes Berg51f458d2015-06-17 13:54:54 +020073 rcu_read_lock();
74
75 list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
Michal Kaziorf9dca802015-05-13 09:16:48 +000076 vlan->crypto_tx_tailroom_needed_cnt += delta;
77
Johannes Berg51f458d2015-06-17 13:54:54 +020078 rcu_read_unlock();
Michal Kaziorf9dca802015-05-13 09:16:48 +000079}
80
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +053081static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
82{
83 /*
84 * When this count is zero, SKB resizing for allocating tailroom
85 * for IV or MMIC is skipped. But, this check has created two race
86 * cases in xmit path while transiting from zero count to one:
87 *
88 * 1. SKB resize was skipped because no key was added but just before
89 * the xmit key is added and SW encryption kicks off.
90 *
91 * 2. SKB resize was skipped because all the keys were hw planted but
92 * just before xmit one of the key is deleted and SW encryption kicks
93 * off.
94 *
95 * In both the above case SW encryption will find not enough space for
96 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
97 *
98 * Solution has been explained at
99 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
100 */
101
Johannes Berg51f458d2015-06-17 13:54:54 +0200102 assert_key_lock(sdata->local);
103
Michal Kaziorf9dca802015-05-13 09:16:48 +0000104 update_vlan_tailroom_need_count(sdata, 1);
105
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530106 if (!sdata->crypto_tx_tailroom_needed_cnt++) {
107 /*
108 * Flush all XMIT packets currently using HW encryption or no
109 * encryption at all if the count transition is from 0 -> 1.
110 */
111 synchronize_net();
112 }
113}
114
Michal Kaziorf9dca802015-05-13 09:16:48 +0000115static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
116 int delta)
117{
Johannes Berg51f458d2015-06-17 13:54:54 +0200118 assert_key_lock(sdata->local);
119
Michal Kaziorf9dca802015-05-13 09:16:48 +0000120 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
121
122 update_vlan_tailroom_need_count(sdata, -delta);
123 sdata->crypto_tx_tailroom_needed_cnt -= delta;
124}
125
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300126static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
Johannes Berg11a843b2007-08-28 17:01:55 -0400127{
Johannes Bergdc822b52008-12-29 12:55:09 +0100128 struct ieee80211_sub_if_data *sdata;
Johannes Berg89c91ca2012-01-20 13:55:19 +0100129 struct sta_info *sta;
Johannes Bergfa7e1fb2015-01-22 18:44:19 +0100130 int ret = -EOPNOTSUPP;
Johannes Berg11a843b2007-08-28 17:01:55 -0400131
Johannes Berg3b967662008-04-08 17:56:52 +0200132 might_sleep();
133
Johannes Berg46191942014-10-13 13:43:29 +0200134 if (key->flags & KEY_FLAG_TAINTED) {
135 /* If we get here, it's during resume and the key is
136 * tainted so shouldn't be used/programmed any more.
137 * However, its flags may still indicate that it was
138 * programmed into the device (since we're in resume)
139 * so clear that flag now to avoid trying to remove
140 * it again later.
141 */
142 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
Johannes Berg27b3eb92013-08-07 20:11:55 +0200143 return -EINVAL;
Johannes Berg46191942014-10-13 13:43:29 +0200144 }
Johannes Berg27b3eb92013-08-07 20:11:55 +0200145
Johannes Berge31b8212010-10-05 19:39:30 +0200146 if (!key->local->ops->set_key)
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300147 goto out_unsupported;
Johannes Berg11a843b2007-08-28 17:01:55 -0400148
Johannes Bergad0e2b52010-06-01 10:19:19 +0200149 assert_key_lock(key->local);
150
Johannes Berg89c91ca2012-01-20 13:55:19 +0100151 sta = key->sta;
Johannes Bergdc822b52008-12-29 12:55:09 +0100152
Johannes Berge31b8212010-10-05 19:39:30 +0200153 /*
154 * If this is a per-STA GTK, check if it
155 * is supported; if not, return.
156 */
157 if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
Johannes Berg30686bf2015-06-02 21:39:54 +0200158 !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
Johannes Berge31b8212010-10-05 19:39:30 +0200159 goto out_unsupported;
160
Johannes Berg89c91ca2012-01-20 13:55:19 +0100161 if (sta && !sta->uploaded)
162 goto out_unsupported;
163
Johannes Bergdc822b52008-12-29 12:55:09 +0100164 sdata = key->sdata;
Helmut Schaa18890d42010-11-19 08:11:01 +0100165 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
166 /*
167 * The driver doesn't know anything about VLAN interfaces.
168 * Hence, don't send GTKs for VLAN interfaces to the driver.
169 */
170 if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
171 goto out_unsupported;
Helmut Schaa18890d42010-11-19 08:11:01 +0100172 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400173
Johannes Berg89c91ca2012-01-20 13:55:19 +0100174 ret = drv_set_key(key->local, SET_KEY, sdata,
175 sta ? &sta->sta : NULL, &key->conf);
Johannes Berg11a843b2007-08-28 17:01:55 -0400176
Johannes Berge31b8212010-10-05 19:39:30 +0200177 if (!ret) {
Johannes Berg11a843b2007-08-28 17:01:55 -0400178 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530179
Johannes Berg1e359a52015-01-05 10:28:49 +0100180 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
Ido Yarivdb128472015-01-06 08:39:02 -0500181 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
Michal Kaziorf9dca802015-05-13 09:16:48 +0000182 decrease_tailroom_need_count(sdata, 1);
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530183
Arik Nemtsov077a9152011-10-23 08:21:41 +0200184 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
185 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
186
Johannes Berge31b8212010-10-05 19:39:30 +0200187 return 0;
188 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400189
Johannes Bergfa7e1fb2015-01-22 18:44:19 +0100190 if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200191 sdata_err(sdata,
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700192 "failed to set key (%d, %pM) to hardware (%d)\n",
Johannes Berg89c91ca2012-01-20 13:55:19 +0100193 key->conf.keyidx,
194 sta ? sta->sta.addr : bcast_addr, ret);
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300195
Johannes Berge31b8212010-10-05 19:39:30 +0200196 out_unsupported:
197 switch (key->conf.cipher) {
198 case WLAN_CIPHER_SUITE_WEP40:
199 case WLAN_CIPHER_SUITE_WEP104:
200 case WLAN_CIPHER_SUITE_TKIP:
201 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200202 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Berge31b8212010-10-05 19:39:30 +0200203 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +0200204 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Jouni Malinen8ade5382015-01-24 19:52:09 +0200205 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
206 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200207 case WLAN_CIPHER_SUITE_GCMP:
208 case WLAN_CIPHER_SUITE_GCMP_256:
Johannes Bergfa7e1fb2015-01-22 18:44:19 +0100209 /* all of these we can do in software - if driver can */
210 if (ret == 1)
211 return 0;
Johannes Berg30686bf2015-06-02 21:39:54 +0200212 if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
Johannes Bergfa7e1fb2015-01-22 18:44:19 +0100213 return -EINVAL;
Johannes Berge31b8212010-10-05 19:39:30 +0200214 return 0;
215 default:
216 return -EINVAL;
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300217 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400218}
219
220static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
221{
Johannes Bergdc822b52008-12-29 12:55:09 +0100222 struct ieee80211_sub_if_data *sdata;
Johannes Berg89c91ca2012-01-20 13:55:19 +0100223 struct sta_info *sta;
Johannes Berg11a843b2007-08-28 17:01:55 -0400224 int ret;
225
Johannes Berg3b967662008-04-08 17:56:52 +0200226 might_sleep();
227
Johannes Bergdb4d1162008-02-25 16:27:45 +0100228 if (!key || !key->local->ops->set_key)
Johannes Berg11a843b2007-08-28 17:01:55 -0400229 return;
230
Johannes Bergad0e2b52010-06-01 10:19:19 +0200231 assert_key_lock(key->local);
232
233 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
Johannes Berg11a843b2007-08-28 17:01:55 -0400234 return;
235
Johannes Berg89c91ca2012-01-20 13:55:19 +0100236 sta = key->sta;
Johannes Bergdc822b52008-12-29 12:55:09 +0100237 sdata = key->sdata;
238
Johannes Berg1e359a52015-01-05 10:28:49 +0100239 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
Ido Yarivdb128472015-01-06 08:39:02 -0500240 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530241 increment_tailroom_need_count(sdata);
242
Johannes Berg12375ef2009-11-25 20:30:31 +0100243 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
Johannes Berg89c91ca2012-01-20 13:55:19 +0100244 sta ? &sta->sta : NULL, &key->conf);
Johannes Berg11a843b2007-08-28 17:01:55 -0400245
246 if (ret)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200247 sdata_err(sdata,
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700248 "failed to remove key (%d, %pM) from hardware (%d)\n",
Johannes Berg89c91ca2012-01-20 13:55:19 +0100249 key->conf.keyidx,
250 sta ? sta->sta.addr : bcast_addr, ret);
Johannes Berg11a843b2007-08-28 17:01:55 -0400251
Johannes Berg3b967662008-04-08 17:56:52 +0200252 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
Johannes Berg3b967662008-04-08 17:56:52 +0200253}
254
255static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
Johannes Bergf7e01042010-12-09 19:49:02 +0100256 int idx, bool uni, bool multi)
Johannes Berg3b967662008-04-08 17:56:52 +0200257{
258 struct ieee80211_key *key = NULL;
259
Johannes Bergad0e2b52010-06-01 10:19:19 +0200260 assert_key_lock(sdata->local);
261
Johannes Berg3b967662008-04-08 17:56:52 +0200262 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
Johannes Berg40b275b2011-05-13 14:15:49 +0200263 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Johannes Berg3b967662008-04-08 17:56:52 +0200264
Yoni Divinskyde5fad82012-05-30 11:36:39 +0300265 if (uni) {
Johannes Bergf7e01042010-12-09 19:49:02 +0100266 rcu_assign_pointer(sdata->default_unicast_key, key);
Johannes Berg17c18bf2015-03-21 15:25:43 +0100267 ieee80211_check_fast_xmit_iface(sdata);
Yoni Divinskyde5fad82012-05-30 11:36:39 +0300268 drv_set_default_unicast_key(sdata->local, sdata, idx);
269 }
270
Johannes Bergf7e01042010-12-09 19:49:02 +0100271 if (multi)
272 rcu_assign_pointer(sdata->default_multicast_key, key);
Johannes Berg3b967662008-04-08 17:56:52 +0200273
Johannes Bergf7e01042010-12-09 19:49:02 +0100274 ieee80211_debugfs_key_update_default(sdata);
Johannes Berg3b967662008-04-08 17:56:52 +0200275}
276
Johannes Bergf7e01042010-12-09 19:49:02 +0100277void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
278 bool uni, bool multi)
Johannes Berg3b967662008-04-08 17:56:52 +0200279{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200280 mutex_lock(&sdata->local->key_mtx);
Johannes Bergf7e01042010-12-09 19:49:02 +0100281 __ieee80211_set_default_key(sdata, idx, uni, multi);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200282 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200283}
284
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200285static void
286__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
287{
288 struct ieee80211_key *key = NULL;
289
Johannes Bergad0e2b52010-06-01 10:19:19 +0200290 assert_key_lock(sdata->local);
291
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200292 if (idx >= NUM_DEFAULT_KEYS &&
293 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
Johannes Berg40b275b2011-05-13 14:15:49 +0200294 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200295
296 rcu_assign_pointer(sdata->default_mgmt_key, key);
297
Johannes Bergf7e01042010-12-09 19:49:02 +0100298 ieee80211_debugfs_key_update_default(sdata);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200299}
300
301void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
302 int idx)
303{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200304 mutex_lock(&sdata->local->key_mtx);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200305 __ieee80211_set_default_mgmt_key(sdata, idx);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200306 mutex_unlock(&sdata->local->key_mtx);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200307}
308
Johannes Berg3b967662008-04-08 17:56:52 +0200309
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100310static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
311 struct sta_info *sta,
312 bool pairwise,
313 struct ieee80211_key *old,
314 struct ieee80211_key *new)
Johannes Berg3b967662008-04-08 17:56:52 +0200315{
Johannes Bergf7e01042010-12-09 19:49:02 +0100316 int idx;
317 bool defunikey, defmultikey, defmgmtkey;
Johannes Berg3b967662008-04-08 17:56:52 +0200318
Johannes Berg5282c3b2013-10-29 10:00:08 +0100319 /* caller must provide at least one old/new */
320 if (WARN_ON(!new && !old))
321 return;
322
Johannes Berg3b967662008-04-08 17:56:52 +0200323 if (new)
Eliad Pelleref044762015-11-17 10:24:37 +0200324 list_add_tail_rcu(&new->list, &sdata->key_list);
Johannes Berg3b967662008-04-08 17:56:52 +0200325
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200326 WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
327
328 if (old)
329 idx = old->conf.keyidx;
330 else
331 idx = new->conf.keyidx;
332
333 if (sta) {
334 if (pairwise) {
335 rcu_assign_pointer(sta->ptk[idx], new);
336 sta->ptk_idx = idx;
Johannes Berg17c18bf2015-03-21 15:25:43 +0100337 ieee80211_check_fast_xmit(sta);
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200338 } else {
339 rcu_assign_pointer(sta->gtk[idx], new);
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200340 }
Johannes Berg3b967662008-04-08 17:56:52 +0200341 } else {
Johannes Berg40b275b2011-05-13 14:15:49 +0200342 defunikey = old &&
343 old == key_mtx_dereference(sdata->local,
344 sdata->default_unicast_key);
345 defmultikey = old &&
346 old == key_mtx_dereference(sdata->local,
347 sdata->default_multicast_key);
348 defmgmtkey = old &&
349 old == key_mtx_dereference(sdata->local,
350 sdata->default_mgmt_key);
Johannes Berg3b967662008-04-08 17:56:52 +0200351
Johannes Bergf7e01042010-12-09 19:49:02 +0100352 if (defunikey && !new)
353 __ieee80211_set_default_key(sdata, -1, true, false);
354 if (defmultikey && !new)
355 __ieee80211_set_default_key(sdata, -1, false, true);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200356 if (defmgmtkey && !new)
357 __ieee80211_set_default_mgmt_key(sdata, -1);
Johannes Berg3b967662008-04-08 17:56:52 +0200358
359 rcu_assign_pointer(sdata->keys[idx], new);
Johannes Bergf7e01042010-12-09 19:49:02 +0100360 if (defunikey && new)
361 __ieee80211_set_default_key(sdata, new->conf.keyidx,
362 true, false);
363 if (defmultikey && new)
364 __ieee80211_set_default_key(sdata, new->conf.keyidx,
365 false, true);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200366 if (defmgmtkey && new)
367 __ieee80211_set_default_mgmt_key(sdata,
368 new->conf.keyidx);
Johannes Berg3b967662008-04-08 17:56:52 +0200369 }
370
Johannes Bergb5c34f62011-01-03 19:51:09 +0100371 if (old)
Eliad Pelleref044762015-11-17 10:24:37 +0200372 list_del_rcu(&old->list);
Johannes Berg11a843b2007-08-28 17:01:55 -0400373}
374
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200375struct ieee80211_key *
376ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
377 const u8 *key_data,
378 size_t seq_len, const u8 *seq,
379 const struct ieee80211_cipher_scheme *cs)
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200380{
381 struct ieee80211_key *key;
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100382 int i, j, err;
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200383
Johannes Berg8c5bb1f2014-04-29 17:55:26 +0200384 if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
385 return ERR_PTR(-EINVAL);
Johannes Berg11a843b2007-08-28 17:01:55 -0400386
387 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200388 if (!key)
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100389 return ERR_PTR(-ENOMEM);
Johannes Berg11a843b2007-08-28 17:01:55 -0400390
391 /*
392 * Default to software encryption; we'll later upload the
393 * key to the hardware if possible.
394 */
Johannes Berg11a843b2007-08-28 17:01:55 -0400395 key->conf.flags = 0;
396 key->flags = 0;
397
Johannes Berg97359d12010-08-10 09:46:38 +0200398 key->conf.cipher = cipher;
Johannes Berg11a843b2007-08-28 17:01:55 -0400399 key->conf.keyidx = idx;
400 key->conf.keylen = key_len;
Johannes Berg97359d12010-08-10 09:46:38 +0200401 switch (cipher) {
402 case WLAN_CIPHER_SUITE_WEP40:
403 case WLAN_CIPHER_SUITE_WEP104:
Johannes Berg4325f6c2013-05-08 13:09:08 +0200404 key->conf.iv_len = IEEE80211_WEP_IV_LEN;
405 key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
Felix Fietkau76708de2008-10-05 18:02:48 +0200406 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200407 case WLAN_CIPHER_SUITE_TKIP:
Johannes Berg4325f6c2013-05-08 13:09:08 +0200408 key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
409 key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
Jouni Malinen9f26a952009-05-15 12:38:32 +0300410 if (seq) {
Johannes Berg5a306f52012-11-14 23:22:21 +0100411 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300412 key->u.tkip.rx[i].iv32 =
413 get_unaligned_le32(&seq[2]);
414 key->u.tkip.rx[i].iv16 =
415 get_unaligned_le16(seq);
416 }
417 }
Johannes Berg523b02e2011-07-07 22:28:01 +0200418 spin_lock_init(&key->u.tkip.txlock);
Felix Fietkau76708de2008-10-05 18:02:48 +0200419 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200420 case WLAN_CIPHER_SUITE_CCMP:
Johannes Berg4325f6c2013-05-08 13:09:08 +0200421 key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
422 key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
Jouni Malinen9f26a952009-05-15 12:38:32 +0300423 if (seq) {
Johannes Berg5a306f52012-11-14 23:22:21 +0100424 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
Johannes Berg4325f6c2013-05-08 13:09:08 +0200425 for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300426 key->u.ccmp.rx_pn[i][j] =
Johannes Berg4325f6c2013-05-08 13:09:08 +0200427 seq[IEEE80211_CCMP_PN_LEN - j - 1];
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300428 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400429 /*
430 * Initialize AES key state here as an optimization so that
431 * it does not need to be initialized for every packet.
432 */
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200433 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
434 key_data, key_len, IEEE80211_CCMP_MIC_LEN);
435 if (IS_ERR(key->u.ccmp.tfm)) {
436 err = PTR_ERR(key->u.ccmp.tfm);
437 kfree(key);
438 return ERR_PTR(err);
439 }
440 break;
441 case WLAN_CIPHER_SUITE_CCMP_256:
442 key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
443 key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
444 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
445 for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
446 key->u.ccmp.rx_pn[i][j] =
447 seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
448 /* Initialize AES key state here as an optimization so that
449 * it does not need to be initialized for every packet.
450 */
451 key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
452 key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100453 if (IS_ERR(key->u.ccmp.tfm)) {
454 err = PTR_ERR(key->u.ccmp.tfm);
Johannes Berg3b967662008-04-08 17:56:52 +0200455 kfree(key);
Petr Å tetiar1f951a72011-03-27 13:31:26 +0200456 return ERR_PTR(err);
Johannes Berg11a843b2007-08-28 17:01:55 -0400457 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200458 break;
459 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +0200460 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Johannes Berg60ae0f22010-08-10 09:46:39 +0200461 key->conf.iv_len = 0;
Jouni Malinen56c52da2015-01-24 19:52:08 +0200462 if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
463 key->conf.icv_len = sizeof(struct ieee80211_mmie);
464 else
465 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
Johannes Berg60ae0f22010-08-10 09:46:39 +0200466 if (seq)
Johannes Berg4325f6c2013-05-08 13:09:08 +0200467 for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
Johannes Berg0f927322012-11-14 23:15:11 +0100468 key->u.aes_cmac.rx_pn[j] =
Johannes Berg4325f6c2013-05-08 13:09:08 +0200469 seq[IEEE80211_CMAC_PN_LEN - j - 1];
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200470 /*
471 * Initialize AES key state here as an optimization so that
472 * it does not need to be initialized for every packet.
473 */
474 key->u.aes_cmac.tfm =
Jouni Malinen56c52da2015-01-24 19:52:08 +0200475 ieee80211_aes_cmac_key_setup(key_data, key_len);
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100476 if (IS_ERR(key->u.aes_cmac.tfm)) {
477 err = PTR_ERR(key->u.aes_cmac.tfm);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200478 kfree(key);
Petr Å tetiar1f951a72011-03-27 13:31:26 +0200479 return ERR_PTR(err);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200480 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200481 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +0200482 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
483 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
484 key->conf.iv_len = 0;
485 key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
486 if (seq)
487 for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
488 key->u.aes_gmac.rx_pn[j] =
489 seq[IEEE80211_GMAC_PN_LEN - j - 1];
490 /* Initialize AES key state here as an optimization so that
491 * it does not need to be initialized for every packet.
492 */
493 key->u.aes_gmac.tfm =
494 ieee80211_aes_gmac_key_setup(key_data, key_len);
495 if (IS_ERR(key->u.aes_gmac.tfm)) {
496 err = PTR_ERR(key->u.aes_gmac.tfm);
497 kfree(key);
498 return ERR_PTR(err);
499 }
500 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200501 case WLAN_CIPHER_SUITE_GCMP:
502 case WLAN_CIPHER_SUITE_GCMP_256:
503 key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
504 key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
505 for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
506 for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
507 key->u.gcmp.rx_pn[i][j] =
508 seq[IEEE80211_GCMP_PN_LEN - j - 1];
509 /* Initialize AES key state here as an optimization so that
510 * it does not need to be initialized for every packet.
511 */
512 key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
513 key_len);
514 if (IS_ERR(key->u.gcmp.tfm)) {
515 err = PTR_ERR(key->u.gcmp.tfm);
516 kfree(key);
517 return ERR_PTR(err);
518 }
519 break;
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200520 default:
521 if (cs) {
Johannes Berge3a55b52015-05-05 16:32:29 +0200522 if (seq_len && seq_len != cs->pn_len) {
523 kfree(key);
524 return ERR_PTR(-EINVAL);
525 }
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200526
527 key->conf.iv_len = cs->hdr_len;
528 key->conf.icv_len = cs->mic_len;
529 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
Johannes Berge3a55b52015-05-05 16:32:29 +0200530 for (j = 0; j < seq_len; j++)
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200531 key->u.gen.rx_pn[i][j] =
Johannes Berge3a55b52015-05-05 16:32:29 +0200532 seq[seq_len - j - 1];
Cedric Izoardc7ef38e2015-03-17 10:47:33 +0000533 key->flags |= KEY_FLAG_CIPHER_SCHEME;
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200534 }
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200535 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200536 memcpy(key->conf.key, key_data, key_len);
537 INIT_LIST_HEAD(&key->list);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200538
Johannes Bergdb4d1162008-02-25 16:27:45 +0100539 return key;
540}
Johannes Berg11a843b2007-08-28 17:01:55 -0400541
Johannes Berg79cf2df2013-03-06 22:53:52 +0100542static void ieee80211_key_free_common(struct ieee80211_key *key)
543{
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200544 switch (key->conf.cipher) {
545 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200546 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Berg79cf2df2013-03-06 22:53:52 +0100547 ieee80211_aes_key_free(key->u.ccmp.tfm);
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200548 break;
549 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +0200550 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Johannes Berg79cf2df2013-03-06 22:53:52 +0100551 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200552 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +0200553 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
554 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
555 ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
556 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +0200557 case WLAN_CIPHER_SUITE_GCMP:
558 case WLAN_CIPHER_SUITE_GCMP_256:
559 ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
560 break;
561 }
Johannes Berg29c3f9c2014-09-10 13:39:55 +0300562 kzfree(key);
Johannes Berg79cf2df2013-03-06 22:53:52 +0100563}
564
Johannes Berg6d10e462013-03-06 23:09:11 +0100565static void __ieee80211_key_destroy(struct ieee80211_key *key,
566 bool delay_tailroom)
Johannes Bergad0e2b52010-06-01 10:19:19 +0200567{
Jouni Malinen32162a42010-07-26 15:52:03 -0700568 if (key->local)
569 ieee80211_key_disable_hw_accel(key);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200570
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530571 if (key->local) {
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100572 struct ieee80211_sub_if_data *sdata = key->sdata;
573
Jouni Malinen32162a42010-07-26 15:52:03 -0700574 ieee80211_debugfs_key_remove(key);
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100575
576 if (delay_tailroom) {
577 /* see ieee80211_delayed_tailroom_dec */
578 sdata->crypto_tx_tailroom_pending_dec++;
579 schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
580 HZ/2);
581 } else {
Michal Kaziorf9dca802015-05-13 09:16:48 +0000582 decrease_tailroom_need_count(sdata, 1);
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100583 }
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530584 }
Johannes Bergad0e2b52010-06-01 10:19:19 +0200585
Johannes Berg79cf2df2013-03-06 22:53:52 +0100586 ieee80211_key_free_common(key);
587}
588
Johannes Berg6d10e462013-03-06 23:09:11 +0100589static void ieee80211_key_destroy(struct ieee80211_key *key,
590 bool delay_tailroom)
591{
592 if (!key)
593 return;
594
595 /*
Eliad Pelleref044762015-11-17 10:24:37 +0200596 * Synchronize so the TX path and rcu key iterators
597 * can no longer be using this key before we free/remove it.
Johannes Berg6d10e462013-03-06 23:09:11 +0100598 */
599 synchronize_net();
600
601 __ieee80211_key_destroy(key, delay_tailroom);
602}
603
Johannes Berg79cf2df2013-03-06 22:53:52 +0100604void ieee80211_key_free_unused(struct ieee80211_key *key)
605{
606 WARN_ON(key->sdata || key->local);
607 ieee80211_key_free_common(key);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200608}
609
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300610int ieee80211_key_link(struct ieee80211_key *key,
611 struct ieee80211_sub_if_data *sdata,
612 struct sta_info *sta)
Johannes Bergdb4d1162008-02-25 16:27:45 +0100613{
Johannes Berg27b3eb92013-08-07 20:11:55 +0200614 struct ieee80211_local *local = sdata->local;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100615 struct ieee80211_key *old_key;
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300616 int idx, ret;
Mariusz Kozlowski67aa0302011-03-26 18:58:51 +0100617 bool pairwise;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100618
Mariusz Kozlowski67aa0302011-03-26 18:58:51 +0100619 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100620 idx = key->conf.keyidx;
621 key->local = sdata->local;
622 key->sdata = sdata;
623 key->sta = sta;
624
Johannes Bergad0e2b52010-06-01 10:19:19 +0200625 mutex_lock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200626
Johannes Berge31b8212010-10-05 19:39:30 +0200627 if (sta && pairwise)
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200628 old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
Johannes Berge31b8212010-10-05 19:39:30 +0200629 else if (sta)
Johannes Berg40b275b2011-05-13 14:15:49 +0200630 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400631 else
Johannes Berg40b275b2011-05-13 14:15:49 +0200632 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Johannes Bergdb4d1162008-02-25 16:27:45 +0100633
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530634 increment_tailroom_need_count(sdata);
635
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100636 ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
637 ieee80211_key_destroy(old_key, true);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400638
Johannes Bergad0e2b52010-06-01 10:19:19 +0200639 ieee80211_debugfs_key_add(key);
Johannes Berg3b967662008-04-08 17:56:52 +0200640
Johannes Berg27b3eb92013-08-07 20:11:55 +0200641 if (!local->wowlan) {
642 ret = ieee80211_key_enable_hw_accel(key);
643 if (ret)
644 ieee80211_key_free(key, true);
645 } else {
646 ret = 0;
647 }
Johannes Berg79cf2df2013-03-06 22:53:52 +0100648
Johannes Bergad0e2b52010-06-01 10:19:19 +0200649 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300650
651 return ret;
Johannes Berg3a245762008-04-09 16:45:37 +0200652}
653
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100654void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
Johannes Berg3a245762008-04-09 16:45:37 +0200655{
Johannes Berg5c0c3642011-05-12 14:31:49 +0200656 if (!key)
657 return;
658
Johannes Berg3a245762008-04-09 16:45:37 +0200659 /*
660 * Replace key with nothingness if it was ever used.
661 */
662 if (key->sdata)
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100663 ieee80211_key_replace(key->sdata, key->sta,
Johannes Berge31b8212010-10-05 19:39:30 +0200664 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
665 key, NULL);
Johannes Berg3b8d9c22013-03-06 22:58:23 +0100666 ieee80211_key_destroy(key, delay_tailroom);
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200667}
668
Johannes Berg3b967662008-04-08 17:56:52 +0200669void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
670{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200671 struct ieee80211_key *key;
Michal Kaziorf9dca802015-05-13 09:16:48 +0000672 struct ieee80211_sub_if_data *vlan;
Johannes Bergad0e2b52010-06-01 10:19:19 +0200673
Johannes Berg3a245762008-04-09 16:45:37 +0200674 ASSERT_RTNL();
Johannes Berg3b967662008-04-08 17:56:52 +0200675
Johannes Berg9607e6b2009-12-23 13:15:31 +0100676 if (WARN_ON(!ieee80211_sdata_running(sdata)))
Johannes Berg3b967662008-04-08 17:56:52 +0200677 return;
678
Johannes Bergad0e2b52010-06-01 10:19:19 +0200679 mutex_lock(&sdata->local->key_mtx);
680
Michal Kaziorf9dca802015-05-13 09:16:48 +0000681 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
682 sdata->crypto_tx_tailroom_pending_dec);
683
684 if (sdata->vif.type == NL80211_IFTYPE_AP) {
685 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
686 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
687 vlan->crypto_tx_tailroom_pending_dec);
688 }
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530689
690 list_for_each_entry(key, &sdata->key_list, list) {
691 increment_tailroom_need_count(sdata);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200692 ieee80211_key_enable_hw_accel(key);
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530693 }
Johannes Bergad0e2b52010-06-01 10:19:19 +0200694
695 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200696}
697
Michal Kaziorf9dca802015-05-13 09:16:48 +0000698void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
699{
700 struct ieee80211_sub_if_data *vlan;
701
702 mutex_lock(&sdata->local->key_mtx);
703
704 sdata->crypto_tx_tailroom_needed_cnt = 0;
705
706 if (sdata->vif.type == NL80211_IFTYPE_AP) {
707 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
708 vlan->crypto_tx_tailroom_needed_cnt = 0;
709 }
710
711 mutex_unlock(&sdata->local->key_mtx);
712}
713
Johannes Berg830af022011-07-05 16:35:39 +0200714void ieee80211_iter_keys(struct ieee80211_hw *hw,
715 struct ieee80211_vif *vif,
716 void (*iter)(struct ieee80211_hw *hw,
717 struct ieee80211_vif *vif,
718 struct ieee80211_sta *sta,
719 struct ieee80211_key_conf *key,
720 void *data),
721 void *iter_data)
722{
723 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg27b3eb92013-08-07 20:11:55 +0200724 struct ieee80211_key *key, *tmp;
Johannes Berg830af022011-07-05 16:35:39 +0200725 struct ieee80211_sub_if_data *sdata;
726
727 ASSERT_RTNL();
728
729 mutex_lock(&local->key_mtx);
730 if (vif) {
731 sdata = vif_to_sdata(vif);
Johannes Berg27b3eb92013-08-07 20:11:55 +0200732 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
Johannes Berg830af022011-07-05 16:35:39 +0200733 iter(hw, &sdata->vif,
734 key->sta ? &key->sta->sta : NULL,
735 &key->conf, iter_data);
736 } else {
737 list_for_each_entry(sdata, &local->interfaces, list)
Johannes Berg27b3eb92013-08-07 20:11:55 +0200738 list_for_each_entry_safe(key, tmp,
739 &sdata->key_list, list)
Johannes Berg830af022011-07-05 16:35:39 +0200740 iter(hw, &sdata->vif,
741 key->sta ? &key->sta->sta : NULL,
742 &key->conf, iter_data);
743 }
744 mutex_unlock(&local->key_mtx);
745}
746EXPORT_SYMBOL(ieee80211_iter_keys);
747
Eliad Pelleref044762015-11-17 10:24:37 +0200748static void
749_ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
750 struct ieee80211_sub_if_data *sdata,
751 void (*iter)(struct ieee80211_hw *hw,
752 struct ieee80211_vif *vif,
753 struct ieee80211_sta *sta,
754 struct ieee80211_key_conf *key,
755 void *data),
756 void *iter_data)
757{
758 struct ieee80211_key *key;
759
760 list_for_each_entry_rcu(key, &sdata->key_list, list) {
761 /* skip keys of station in removal process */
762 if (key->sta && key->sta->removed)
763 continue;
764 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
765 continue;
766
767 iter(hw, &sdata->vif,
768 key->sta ? &key->sta->sta : NULL,
769 &key->conf, iter_data);
770 }
771}
772
773void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
774 struct ieee80211_vif *vif,
775 void (*iter)(struct ieee80211_hw *hw,
776 struct ieee80211_vif *vif,
777 struct ieee80211_sta *sta,
778 struct ieee80211_key_conf *key,
779 void *data),
780 void *iter_data)
781{
782 struct ieee80211_local *local = hw_to_local(hw);
783 struct ieee80211_sub_if_data *sdata;
784
785 if (vif) {
786 sdata = vif_to_sdata(vif);
787 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
788 } else {
789 list_for_each_entry_rcu(sdata, &local->interfaces, list)
790 _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
791 }
792}
793EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
794
Johannes Berg7907c7d2013-12-04 23:47:09 +0100795static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
796 struct list_head *keys)
Johannes Berg11a843b2007-08-28 17:01:55 -0400797{
798 struct ieee80211_key *key, *tmp;
Johannes Berg3b967662008-04-08 17:56:52 +0200799
Michal Kaziorf9dca802015-05-13 09:16:48 +0000800 decrease_tailroom_need_count(sdata,
801 sdata->crypto_tx_tailroom_pending_dec);
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100802 sdata->crypto_tx_tailroom_pending_dec = 0;
803
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200804 ieee80211_debugfs_key_remove_mgmt_default(sdata);
Johannes Berg11a843b2007-08-28 17:01:55 -0400805
Johannes Berg6d10e462013-03-06 23:09:11 +0100806 list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
807 ieee80211_key_replace(key->sdata, key->sta,
808 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
809 key, NULL);
Johannes Berg7907c7d2013-12-04 23:47:09 +0100810 list_add_tail(&key->list, keys);
Johannes Berg6d10e462013-03-06 23:09:11 +0100811 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400812
Johannes Bergf7e01042010-12-09 19:49:02 +0100813 ieee80211_debugfs_key_update_default(sdata);
Johannes Berg7907c7d2013-12-04 23:47:09 +0100814}
Johannes Bergf7e01042010-12-09 19:49:02 +0100815
Johannes Berg7907c7d2013-12-04 23:47:09 +0100816void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
817 bool force_synchronize)
818{
819 struct ieee80211_local *local = sdata->local;
820 struct ieee80211_sub_if_data *vlan;
Michal Kaziorf9dca802015-05-13 09:16:48 +0000821 struct ieee80211_sub_if_data *master;
Johannes Berg7907c7d2013-12-04 23:47:09 +0100822 struct ieee80211_key *key, *tmp;
823 LIST_HEAD(keys);
824
825 cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
826
827 mutex_lock(&local->key_mtx);
828
829 ieee80211_free_keys_iface(sdata, &keys);
830
831 if (sdata->vif.type == NL80211_IFTYPE_AP) {
832 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
833 ieee80211_free_keys_iface(vlan, &keys);
Johannes Berg6d10e462013-03-06 23:09:11 +0100834 }
835
Johannes Berg7907c7d2013-12-04 23:47:09 +0100836 if (!list_empty(&keys) || force_synchronize)
837 synchronize_net();
838 list_for_each_entry_safe(key, tmp, &keys, list)
839 __ieee80211_key_destroy(key, false);
840
Michal Kaziorf9dca802015-05-13 09:16:48 +0000841 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
842 if (sdata->bss) {
843 master = container_of(sdata->bss,
844 struct ieee80211_sub_if_data,
845 u.ap);
846
847 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
848 master->crypto_tx_tailroom_needed_cnt);
849 }
850 } else {
851 WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
852 sdata->crypto_tx_tailroom_pending_dec);
853 }
854
Johannes Berg7907c7d2013-12-04 23:47:09 +0100855 if (sdata->vif.type == NL80211_IFTYPE_AP) {
856 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
857 WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
858 vlan->crypto_tx_tailroom_pending_dec);
859 }
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100860
Johannes Berg7907c7d2013-12-04 23:47:09 +0100861 mutex_unlock(&local->key_mtx);
Johannes Berg11a843b2007-08-28 17:01:55 -0400862}
Johannes Bergc68f4b82011-07-05 16:35:41 +0200863
Johannes Berg6d10e462013-03-06 23:09:11 +0100864void ieee80211_free_sta_keys(struct ieee80211_local *local,
865 struct sta_info *sta)
866{
Johannes Bergc8782072013-12-04 23:05:45 +0100867 struct ieee80211_key *key;
Johannes Berg6d10e462013-03-06 23:09:11 +0100868 int i;
869
870 mutex_lock(&local->key_mtx);
Johannes Berg28a9bc62014-12-17 13:55:49 +0100871 for (i = 0; i < ARRAY_SIZE(sta->gtk); i++) {
Johannes Berg6d10e462013-03-06 23:09:11 +0100872 key = key_mtx_dereference(local, sta->gtk[i]);
873 if (!key)
874 continue;
875 ieee80211_key_replace(key->sdata, key->sta,
876 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
877 key, NULL);
Johannes Bergc8782072013-12-04 23:05:45 +0100878 __ieee80211_key_destroy(key, true);
Johannes Berg6d10e462013-03-06 23:09:11 +0100879 }
880
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200881 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
882 key = key_mtx_dereference(local, sta->ptk[i]);
883 if (!key)
884 continue;
Johannes Berg6d10e462013-03-06 23:09:11 +0100885 ieee80211_key_replace(key->sdata, key->sta,
886 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
887 key, NULL);
Johannes Berg6d10e462013-03-06 23:09:11 +0100888 __ieee80211_key_destroy(key, true);
Johannes Bergc8782072013-12-04 23:05:45 +0100889 }
Johannes Berg6d10e462013-03-06 23:09:11 +0100890
891 mutex_unlock(&local->key_mtx);
892}
893
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100894void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
895{
896 struct ieee80211_sub_if_data *sdata;
897
898 sdata = container_of(wk, struct ieee80211_sub_if_data,
899 dec_tailroom_needed_wk.work);
900
901 /*
902 * The reason for the delayed tailroom needed decrementing is to
903 * make roaming faster: during roaming, all keys are first deleted
904 * and then new keys are installed. The first new key causes the
905 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
906 * the cost of synchronize_net() (which can be slow). Avoid this
907 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
908 * key removal for a while, so if we roam the value is larger than
909 * zero and no 0->1 transition happens.
910 *
911 * The cost is that if the AP switching was from an AP with keys
912 * to one without, we still allocate tailroom while it would no
913 * longer be needed. However, in the typical (fast) roaming case
914 * within an ESS this usually won't happen.
915 */
916
917 mutex_lock(&sdata->local->key_mtx);
Michal Kaziorf9dca802015-05-13 09:16:48 +0000918 decrease_tailroom_need_count(sdata,
919 sdata->crypto_tx_tailroom_pending_dec);
Johannes Berg8d1f7ec2013-02-23 00:59:03 +0100920 sdata->crypto_tx_tailroom_pending_dec = 0;
921 mutex_unlock(&sdata->local->key_mtx);
922}
Johannes Bergc68f4b82011-07-05 16:35:41 +0200923
924void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
925 const u8 *replay_ctr, gfp_t gfp)
926{
927 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
928
929 trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
930
931 cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
932}
933EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
Johannes Berg3ea542d2011-07-07 18:58:00 +0200934
935void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
936 struct ieee80211_key_seq *seq)
937{
938 struct ieee80211_key *key;
939 u64 pn64;
940
941 if (WARN_ON(!(keyconf->flags & IEEE80211_KEY_FLAG_GENERATE_IV)))
942 return;
943
944 key = container_of(keyconf, struct ieee80211_key, conf);
945
946 switch (key->conf.cipher) {
947 case WLAN_CIPHER_SUITE_TKIP:
948 seq->tkip.iv32 = key->u.tkip.tx.iv32;
949 seq->tkip.iv16 = key->u.tkip.tx.iv16;
950 break;
951 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200952 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Berg3ea542d2011-07-07 18:58:00 +0200953 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +0200954 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Johannes Bergdb388a52015-06-01 15:36:51 +0200955 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
956 offsetof(typeof(*seq), aes_cmac));
Jouni Malinen8ade5382015-01-24 19:52:09 +0200957 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
958 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
Johannes Bergdb388a52015-06-01 15:36:51 +0200959 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
960 offsetof(typeof(*seq), aes_gmac));
961 case WLAN_CIPHER_SUITE_GCMP:
962 case WLAN_CIPHER_SUITE_GCMP_256:
963 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
964 offsetof(typeof(*seq), gcmp));
965 pn64 = atomic64_read(&key->conf.tx_pn);
Jouni Malinen8ade5382015-01-24 19:52:09 +0200966 seq->ccmp.pn[5] = pn64;
967 seq->ccmp.pn[4] = pn64 >> 8;
968 seq->ccmp.pn[3] = pn64 >> 16;
969 seq->ccmp.pn[2] = pn64 >> 24;
970 seq->ccmp.pn[1] = pn64 >> 32;
971 seq->ccmp.pn[0] = pn64 >> 40;
972 break;
Johannes Berg3ea542d2011-07-07 18:58:00 +0200973 default:
974 WARN_ON(1);
975 }
976}
977EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
978
979void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
980 int tid, struct ieee80211_key_seq *seq)
981{
982 struct ieee80211_key *key;
983 const u8 *pn;
984
985 key = container_of(keyconf, struct ieee80211_key, conf);
986
987 switch (key->conf.cipher) {
988 case WLAN_CIPHER_SUITE_TKIP:
Johannes Berg5a306f52012-11-14 23:22:21 +0100989 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
Johannes Berg3ea542d2011-07-07 18:58:00 +0200990 return;
991 seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
992 seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
993 break;
994 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +0200995 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Berg5a306f52012-11-14 23:22:21 +0100996 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
Johannes Berg3ea542d2011-07-07 18:58:00 +0200997 return;
998 if (tid < 0)
Johannes Berg5a306f52012-11-14 23:22:21 +0100999 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
Johannes Berg3ea542d2011-07-07 18:58:00 +02001000 else
1001 pn = key->u.ccmp.rx_pn[tid];
Johannes Berg4325f6c2013-05-08 13:09:08 +02001002 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg3ea542d2011-07-07 18:58:00 +02001003 break;
1004 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +02001005 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Johannes Berg3ea542d2011-07-07 18:58:00 +02001006 if (WARN_ON(tid != 0))
1007 return;
1008 pn = key->u.aes_cmac.rx_pn;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001009 memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
Johannes Berg3ea542d2011-07-07 18:58:00 +02001010 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001011 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1012 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1013 if (WARN_ON(tid != 0))
1014 return;
1015 pn = key->u.aes_gmac.rx_pn;
1016 memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
1017 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001018 case WLAN_CIPHER_SUITE_GCMP:
1019 case WLAN_CIPHER_SUITE_GCMP_256:
1020 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1021 return;
1022 if (tid < 0)
1023 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1024 else
1025 pn = key->u.gcmp.rx_pn[tid];
1026 memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
1027 break;
Johannes Berg3ea542d2011-07-07 18:58:00 +02001028 }
1029}
1030EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
Johannes Berg27b3eb92013-08-07 20:11:55 +02001031
1032void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
1033 struct ieee80211_key_seq *seq)
1034{
1035 struct ieee80211_key *key;
1036 u64 pn64;
1037
1038 key = container_of(keyconf, struct ieee80211_key, conf);
1039
1040 switch (key->conf.cipher) {
1041 case WLAN_CIPHER_SUITE_TKIP:
1042 key->u.tkip.tx.iv32 = seq->tkip.iv32;
1043 key->u.tkip.tx.iv16 = seq->tkip.iv16;
1044 break;
1045 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001046 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Bergdb388a52015-06-01 15:36:51 +02001047 case WLAN_CIPHER_SUITE_AES_CMAC:
1048 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1049 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1050 offsetof(typeof(*seq), aes_cmac));
1051 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1052 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1053 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1054 offsetof(typeof(*seq), aes_gmac));
1055 case WLAN_CIPHER_SUITE_GCMP:
1056 case WLAN_CIPHER_SUITE_GCMP_256:
1057 BUILD_BUG_ON(offsetof(typeof(*seq), ccmp) !=
1058 offsetof(typeof(*seq), gcmp));
Johannes Berg27b3eb92013-08-07 20:11:55 +02001059 pn64 = (u64)seq->ccmp.pn[5] |
1060 ((u64)seq->ccmp.pn[4] << 8) |
1061 ((u64)seq->ccmp.pn[3] << 16) |
1062 ((u64)seq->ccmp.pn[2] << 24) |
1063 ((u64)seq->ccmp.pn[1] << 32) |
1064 ((u64)seq->ccmp.pn[0] << 40);
Johannes Bergdb388a52015-06-01 15:36:51 +02001065 atomic64_set(&key->conf.tx_pn, pn64);
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001066 break;
Johannes Berg27b3eb92013-08-07 20:11:55 +02001067 default:
1068 WARN_ON(1);
1069 break;
1070 }
1071}
1072EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq);
1073
1074void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
1075 int tid, struct ieee80211_key_seq *seq)
1076{
1077 struct ieee80211_key *key;
1078 u8 *pn;
1079
1080 key = container_of(keyconf, struct ieee80211_key, conf);
1081
1082 switch (key->conf.cipher) {
1083 case WLAN_CIPHER_SUITE_TKIP:
1084 if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
1085 return;
1086 key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
1087 key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
1088 break;
1089 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001090 case WLAN_CIPHER_SUITE_CCMP_256:
Johannes Berg27b3eb92013-08-07 20:11:55 +02001091 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1092 return;
1093 if (tid < 0)
1094 pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
1095 else
1096 pn = key->u.ccmp.rx_pn[tid];
1097 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
1098 break;
1099 case WLAN_CIPHER_SUITE_AES_CMAC:
Jouni Malinen56c52da2015-01-24 19:52:08 +02001100 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
Johannes Berg27b3eb92013-08-07 20:11:55 +02001101 if (WARN_ON(tid != 0))
1102 return;
1103 pn = key->u.aes_cmac.rx_pn;
1104 memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
1105 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001106 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1107 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1108 if (WARN_ON(tid != 0))
1109 return;
1110 pn = key->u.aes_gmac.rx_pn;
1111 memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
1112 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001113 case WLAN_CIPHER_SUITE_GCMP:
1114 case WLAN_CIPHER_SUITE_GCMP_256:
1115 if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
1116 return;
1117 if (tid < 0)
1118 pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
1119 else
1120 pn = key->u.gcmp.rx_pn[tid];
1121 memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
1122 break;
Johannes Berg27b3eb92013-08-07 20:11:55 +02001123 default:
1124 WARN_ON(1);
1125 break;
1126 }
1127}
1128EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
1129
1130void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
1131{
1132 struct ieee80211_key *key;
1133
1134 key = container_of(keyconf, struct ieee80211_key, conf);
1135
1136 assert_key_lock(key->local);
1137
1138 /*
1139 * if key was uploaded, we assume the driver will/has remove(d)
1140 * it, so adjust bookkeeping accordingly
1141 */
1142 if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
1143 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
1144
Johannes Berg1e359a52015-01-05 10:28:49 +01001145 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
Ido Yarivdb128472015-01-06 08:39:02 -05001146 (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
Johannes Berg27b3eb92013-08-07 20:11:55 +02001147 increment_tailroom_need_count(key->sdata);
1148 }
1149
1150 ieee80211_key_free(key, false);
1151}
1152EXPORT_SYMBOL_GPL(ieee80211_remove_key);
1153
1154struct ieee80211_key_conf *
1155ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
1156 struct ieee80211_key_conf *keyconf)
1157{
1158 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1159 struct ieee80211_local *local = sdata->local;
1160 struct ieee80211_key *key;
1161 int err;
1162
1163 if (WARN_ON(!local->wowlan))
1164 return ERR_PTR(-EINVAL);
1165
1166 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1167 return ERR_PTR(-EINVAL);
1168
1169 key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
1170 keyconf->keylen, keyconf->key,
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001171 0, NULL, NULL);
Johannes Berg27b3eb92013-08-07 20:11:55 +02001172 if (IS_ERR(key))
Johannes Bergc5dc1642013-08-28 19:03:36 +02001173 return ERR_CAST(key);
Johannes Berg27b3eb92013-08-07 20:11:55 +02001174
1175 if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
1176 key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
1177
1178 err = ieee80211_key_link(key, sdata, NULL);
1179 if (err)
1180 return ERR_PTR(err);
1181
1182 return &key->conf;
1183}
1184EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);