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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 Berg1f5a7e42007-07-27 15:43:23 +02006 *
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 Berg11a843b2007-08-28 17:01:55 -040012#include <linux/if_ether.h>
13#include <linux/etherdevice.h>
14#include <linux/list.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040015#include <linux/rcupdate.h>
Johannes Bergdb4d1162008-02-25 16:27:45 +010016#include <linux/rtnetlink.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040018#include <linux/export.h>
Johannes Berg1f5a7e42007-07-27 15:43:23 +020019#include <net/mac80211.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010020#include <asm/unaligned.h>
Johannes Berg1f5a7e42007-07-27 15:43:23 +020021#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020022#include "driver-ops.h"
Johannes Berg1f5a7e42007-07-27 15:43:23 +020023#include "debugfs_key.h"
24#include "aes_ccm.h"
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +020025#include "aes_cmac.h"
Johannes Berg1f5a7e42007-07-27 15:43:23 +020026
Johannes Berg11a843b2007-08-28 17:01:55 -040027
Johannes Bergdbbea672008-02-26 14:34:06 +010028/**
29 * DOC: Key handling basics
Johannes Berg11a843b2007-08-28 17:01:55 -040030 *
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 Bergb5c34f62011-01-03 19:51:09 +010035 * 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 Berg11a843b2007-08-28 17:01:55 -040042 *
Johannes Bergb5c34f62011-01-03 19:51:09 +010043 * 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 Berg11a843b2007-08-28 17:01:55 -040049 */
50
51static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
Johannes Berg11a843b2007-08-28 17:01:55 -040052
Johannes Bergad0e2b52010-06-01 10:19:19 +020053static void assert_key_lock(struct ieee80211_local *local)
Johannes Berg3b967662008-04-08 17:56:52 +020054{
Johannes Berg46a5eba2010-09-15 13:28:15 +020055 lockdep_assert_held(&local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +020056}
57
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +053058static 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 Berg3ffc2a92010-08-27 14:26:52 +030088static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
Johannes Berg11a843b2007-08-28 17:01:55 -040089{
Johannes Bergdc822b52008-12-29 12:55:09 +010090 struct ieee80211_sub_if_data *sdata;
Johannes Berg89c91ca2012-01-20 13:55:19 +010091 struct sta_info *sta;
Johannes Berg11a843b2007-08-28 17:01:55 -040092 int ret;
93
Johannes Berg3b967662008-04-08 17:56:52 +020094 might_sleep();
95
Johannes Berge31b8212010-10-05 19:39:30 +020096 if (!key->local->ops->set_key)
Johannes Berg3ffc2a92010-08-27 14:26:52 +030097 goto out_unsupported;
Johannes Berg11a843b2007-08-28 17:01:55 -040098
Johannes Bergad0e2b52010-06-01 10:19:19 +020099 assert_key_lock(key->local);
100
Johannes Berg89c91ca2012-01-20 13:55:19 +0100101 sta = key->sta;
Johannes Bergdc822b52008-12-29 12:55:09 +0100102
Johannes Berge31b8212010-10-05 19:39:30 +0200103 /*
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 Berg89c91ca2012-01-20 13:55:19 +0100111 if (sta && !sta->uploaded)
112 goto out_unsupported;
113
Johannes Bergdc822b52008-12-29 12:55:09 +0100114 sdata = key->sdata;
Helmut Schaa18890d42010-11-19 08:11:01 +0100115 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 Schaa18890d42010-11-19 08:11:01 +0100122 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400123
Johannes Berg89c91ca2012-01-20 13:55:19 +0100124 ret = drv_set_key(key->local, SET_KEY, sdata,
125 sta ? &sta->sta : NULL, &key->conf);
Johannes Berg11a843b2007-08-28 17:01:55 -0400126
Johannes Berge31b8212010-10-05 19:39:30 +0200127 if (!ret) {
Johannes Berg11a843b2007-08-28 17:01:55 -0400128 key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530129
130 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
Arik Nemtsov077a9152011-10-23 08:21:41 +0200131 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
132 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530133 sdata->crypto_tx_tailroom_needed_cnt--;
134
Arik Nemtsov077a9152011-10-23 08:21:41 +0200135 WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
136 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
137
Johannes Berge31b8212010-10-05 19:39:30 +0200138 return 0;
139 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400140
Johannes Berge31b8212010-10-05 19:39:30 +0200141 if (ret != -ENOSPC && ret != -EOPNOTSUPP)
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700142 wiphy_err(key->local->hw.wiphy,
143 "failed to set key (%d, %pM) to hardware (%d)\n",
Johannes Berg89c91ca2012-01-20 13:55:19 +0100144 key->conf.keyidx,
145 sta ? sta->sta.addr : bcast_addr, ret);
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300146
Johannes Berge31b8212010-10-05 19:39:30 +0200147 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 Berg3ffc2a92010-08-27 14:26:52 +0300158 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400159}
160
161static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
162{
Johannes Bergdc822b52008-12-29 12:55:09 +0100163 struct ieee80211_sub_if_data *sdata;
Johannes Berg89c91ca2012-01-20 13:55:19 +0100164 struct sta_info *sta;
Johannes Berg11a843b2007-08-28 17:01:55 -0400165 int ret;
166
Johannes Berg3b967662008-04-08 17:56:52 +0200167 might_sleep();
168
Johannes Bergdb4d1162008-02-25 16:27:45 +0100169 if (!key || !key->local->ops->set_key)
Johannes Berg11a843b2007-08-28 17:01:55 -0400170 return;
171
Johannes Bergad0e2b52010-06-01 10:19:19 +0200172 assert_key_lock(key->local);
173
174 if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
Johannes Berg11a843b2007-08-28 17:01:55 -0400175 return;
176
Johannes Berg89c91ca2012-01-20 13:55:19 +0100177 sta = key->sta;
Johannes Bergdc822b52008-12-29 12:55:09 +0100178 sdata = key->sdata;
179
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530180 if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
Arik Nemtsov077a9152011-10-23 08:21:41 +0200181 (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) ||
182 (key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)))
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530183 increment_tailroom_need_count(sdata);
184
Johannes Berg12375ef2009-11-25 20:30:31 +0100185 ret = drv_set_key(key->local, DISABLE_KEY, sdata,
Johannes Berg89c91ca2012-01-20 13:55:19 +0100186 sta ? &sta->sta : NULL, &key->conf);
Johannes Berg11a843b2007-08-28 17:01:55 -0400187
188 if (ret)
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700189 wiphy_err(key->local->hw.wiphy,
190 "failed to remove key (%d, %pM) from hardware (%d)\n",
Johannes Berg89c91ca2012-01-20 13:55:19 +0100191 key->conf.keyidx,
192 sta ? sta->sta.addr : bcast_addr, ret);
Johannes Berg11a843b2007-08-28 17:01:55 -0400193
Johannes Berg3b967662008-04-08 17:56:52 +0200194 key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
Johannes Berg3b967662008-04-08 17:56:52 +0200195}
196
Johannes Berge31b8212010-10-05 19:39:30 +0200197void 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}
215EXPORT_SYMBOL_GPL(ieee80211_key_removed);
216
Johannes Berg3b967662008-04-08 17:56:52 +0200217static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
Johannes Bergf7e01042010-12-09 19:49:02 +0100218 int idx, bool uni, bool multi)
Johannes Berg3b967662008-04-08 17:56:52 +0200219{
220 struct ieee80211_key *key = NULL;
221
Johannes Bergad0e2b52010-06-01 10:19:19 +0200222 assert_key_lock(sdata->local);
223
Johannes Berg3b967662008-04-08 17:56:52 +0200224 if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
Johannes Berg40b275b2011-05-13 14:15:49 +0200225 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Johannes Berg3b967662008-04-08 17:56:52 +0200226
Johannes Bergf7e01042010-12-09 19:49:02 +0100227 if (uni)
228 rcu_assign_pointer(sdata->default_unicast_key, key);
229 if (multi)
230 rcu_assign_pointer(sdata->default_multicast_key, key);
Johannes Berg3b967662008-04-08 17:56:52 +0200231
Johannes Bergf7e01042010-12-09 19:49:02 +0100232 ieee80211_debugfs_key_update_default(sdata);
Johannes Berg3b967662008-04-08 17:56:52 +0200233}
234
Johannes Bergf7e01042010-12-09 19:49:02 +0100235void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
236 bool uni, bool multi)
Johannes Berg3b967662008-04-08 17:56:52 +0200237{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200238 mutex_lock(&sdata->local->key_mtx);
Johannes Bergf7e01042010-12-09 19:49:02 +0100239 __ieee80211_set_default_key(sdata, idx, uni, multi);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200240 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200241}
242
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200243static void
244__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
245{
246 struct ieee80211_key *key = NULL;
247
Johannes Bergad0e2b52010-06-01 10:19:19 +0200248 assert_key_lock(sdata->local);
249
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200250 if (idx >= NUM_DEFAULT_KEYS &&
251 idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
Johannes Berg40b275b2011-05-13 14:15:49 +0200252 key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200253
254 rcu_assign_pointer(sdata->default_mgmt_key, key);
255
Johannes Bergf7e01042010-12-09 19:49:02 +0100256 ieee80211_debugfs_key_update_default(sdata);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200257}
258
259void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
260 int idx)
261{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200262 mutex_lock(&sdata->local->key_mtx);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200263 __ieee80211_set_default_mgmt_key(sdata, idx);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200264 mutex_unlock(&sdata->local->key_mtx);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200265}
266
Johannes Berg3b967662008-04-08 17:56:52 +0200267
268static void __ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
269 struct sta_info *sta,
Johannes Berge31b8212010-10-05 19:39:30 +0200270 bool pairwise,
Johannes Berg3b967662008-04-08 17:56:52 +0200271 struct ieee80211_key *old,
272 struct ieee80211_key *new)
273{
Johannes Bergf7e01042010-12-09 19:49:02 +0100274 int idx;
275 bool defunikey, defmultikey, defmgmtkey;
Johannes Berg3b967662008-04-08 17:56:52 +0200276
277 if (new)
Johannes Bergf850e002011-07-13 19:50:53 +0200278 list_add_tail(&new->list, &sdata->key_list);
Johannes Berg3b967662008-04-08 17:56:52 +0200279
Johannes Berge31b8212010-10-05 19:39:30 +0200280 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 Berg3b967662008-04-08 17:56:52 +0200288 } 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 Berg40b275b2011-05-13 14:15:49 +0200296 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 Berg3b967662008-04-08 17:56:52 +0200305
Johannes Bergf7e01042010-12-09 19:49:02 +0100306 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 Malinen3cfcf6a2009-01-08 13:32:02 +0200310 if (defmgmtkey && !new)
311 __ieee80211_set_default_mgmt_key(sdata, -1);
Johannes Berg3b967662008-04-08 17:56:52 +0200312
313 rcu_assign_pointer(sdata->keys[idx], new);
Johannes Bergf7e01042010-12-09 19:49:02 +0100314 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 Malinen3cfcf6a2009-01-08 13:32:02 +0200320 if (defmgmtkey && new)
321 __ieee80211_set_default_mgmt_key(sdata,
322 new->conf.keyidx);
Johannes Berg3b967662008-04-08 17:56:52 +0200323 }
324
Johannes Bergb5c34f62011-01-03 19:51:09 +0100325 if (old)
326 list_del(&old->list);
Johannes Berg11a843b2007-08-28 17:01:55 -0400327}
328
Johannes Berg97359d12010-08-10 09:46:38 +0200329struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300330 const u8 *key_data,
331 size_t seq_len, const u8 *seq)
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200332{
333 struct ieee80211_key *key;
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100334 int i, j, err;
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200335
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200336 BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS);
Johannes Berg11a843b2007-08-28 17:01:55 -0400337
338 key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200339 if (!key)
Ben Hutchings1ac62ba2010-08-01 17:37:03 +0100340 return ERR_PTR(-ENOMEM);
Johannes Berg11a843b2007-08-28 17:01:55 -0400341
342 /*
343 * Default to software encryption; we'll later upload the
344 * key to the hardware if possible.
345 */
Johannes Berg11a843b2007-08-28 17:01:55 -0400346 key->conf.flags = 0;
347 key->flags = 0;
348
Johannes Berg97359d12010-08-10 09:46:38 +0200349 key->conf.cipher = cipher;
Johannes Berg11a843b2007-08-28 17:01:55 -0400350 key->conf.keyidx = idx;
351 key->conf.keylen = key_len;
Johannes Berg97359d12010-08-10 09:46:38 +0200352 switch (cipher) {
353 case WLAN_CIPHER_SUITE_WEP40:
354 case WLAN_CIPHER_SUITE_WEP104:
Felix Fietkau76708de2008-10-05 18:02:48 +0200355 key->conf.iv_len = WEP_IV_LEN;
356 key->conf.icv_len = WEP_ICV_LEN;
357 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200358 case WLAN_CIPHER_SUITE_TKIP:
Felix Fietkau76708de2008-10-05 18:02:48 +0200359 key->conf.iv_len = TKIP_IV_LEN;
360 key->conf.icv_len = TKIP_ICV_LEN;
Jouni Malinen9f26a952009-05-15 12:38:32 +0300361 if (seq) {
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300362 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 Berg523b02e2011-07-07 22:28:01 +0200369 spin_lock_init(&key->u.tkip.txlock);
Felix Fietkau76708de2008-10-05 18:02:48 +0200370 break;
Johannes Berg97359d12010-08-10 09:46:38 +0200371 case WLAN_CIPHER_SUITE_CCMP:
Felix Fietkau76708de2008-10-05 18:02:48 +0200372 key->conf.iv_len = CCMP_HDR_LEN;
373 key->conf.icv_len = CCMP_MIC_LEN;
Jouni Malinen9f26a952009-05-15 12:38:32 +0300374 if (seq) {
Jouni Malinen91902522010-06-11 10:27:33 -0700375 for (i = 0; i < NUM_RX_DATA_QUEUES + 1; i++)
Jouni Malinenfaa8fdc2009-05-11 21:57:58 +0300376 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 Berg11a843b2007-08-28 17:01:55 -0400380 /*
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 Hutchings1ac62ba2010-08-01 17:37:03 +0100385 if (IS_ERR(key->u.ccmp.tfm)) {
386 err = PTR_ERR(key->u.ccmp.tfm);
Johannes Berg3b967662008-04-08 17:56:52 +0200387 kfree(key);
Petr Å tetiar1f951a72011-03-27 13:31:26 +0200388 return ERR_PTR(err);
Johannes Berg11a843b2007-08-28 17:01:55 -0400389 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200390 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 Malinen3cfcf6a2009-01-08 13:32:02 +0200397 /*
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 Hutchings1ac62ba2010-08-01 17:37:03 +0100403 if (IS_ERR(key->u.aes_cmac.tfm)) {
404 err = PTR_ERR(key->u.aes_cmac.tfm);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200405 kfree(key);
Petr Å tetiar1f951a72011-03-27 13:31:26 +0200406 return ERR_PTR(err);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200407 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200408 break;
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200409 }
Johannes Berg60ae0f22010-08-10 09:46:39 +0200410 memcpy(key->conf.key, key_data, key_len);
411 INIT_LIST_HEAD(&key->list);
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200412
Johannes Bergdb4d1162008-02-25 16:27:45 +0100413 return key;
414}
Johannes Berg11a843b2007-08-28 17:01:55 -0400415
Johannes Bergad0e2b52010-06-01 10:19:19 +0200416static void __ieee80211_key_destroy(struct ieee80211_key *key)
417{
418 if (!key)
419 return;
420
Johannes Bergd2460f42011-01-03 19:42:24 +0100421 /*
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 Malinen32162a42010-07-26 15:52:03 -0700427 if (key->local)
428 ieee80211_key_disable_hw_accel(key);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200429
Johannes Berg97359d12010-08-10 09:46:38 +0200430 if (key->conf.cipher == WLAN_CIPHER_SUITE_CCMP)
Johannes Bergad0e2b52010-06-01 10:19:19 +0200431 ieee80211_aes_key_free(key->u.ccmp.tfm);
Johannes Berg97359d12010-08-10 09:46:38 +0200432 if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
Johannes Bergad0e2b52010-06-01 10:19:19 +0200433 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530434 if (key->local) {
Jouni Malinen32162a42010-07-26 15:52:03 -0700435 ieee80211_debugfs_key_remove(key);
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530436 key->sdata->crypto_tx_tailroom_needed_cnt--;
437 }
Johannes Bergad0e2b52010-06-01 10:19:19 +0200438
439 kfree(key);
440}
441
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300442int ieee80211_key_link(struct ieee80211_key *key,
443 struct ieee80211_sub_if_data *sdata,
444 struct sta_info *sta)
Johannes Bergdb4d1162008-02-25 16:27:45 +0100445{
446 struct ieee80211_key *old_key;
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300447 int idx, ret;
Mariusz Kozlowski67aa0302011-03-26 18:58:51 +0100448 bool pairwise;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100449
Johannes Bergdb4d1162008-02-25 16:27:45 +0100450 BUG_ON(!sdata);
451 BUG_ON(!key);
452
Mariusz Kozlowski67aa0302011-03-26 18:58:51 +0100453 pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100454 idx = key->conf.keyidx;
455 key->local = sdata->local;
456 key->sdata = sdata;
457 key->sta = sta;
458
Johannes Berg11a843b2007-08-28 17:01:55 -0400459 if (sta) {
Johannes Berg11a843b2007-08-28 17:01:55 -0400460 /*
461 * some hardware cannot handle TKIP with QoS, so
462 * we indicate whether QoS could be in use.
463 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200464 if (test_sta_flag(sta, WLAN_STA_WME))
Johannes Berg11a843b2007-08-28 17:01:55 -0400465 key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
466 } else {
Johannes Berg05c914f2008-09-11 00:01:58 +0200467 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
Johannes Berg11a843b2007-08-28 17:01:55 -0400468 struct sta_info *ap;
469
Johannes Berg3b967662008-04-08 17:56:52 +0200470 /*
Johannes Bergb5c34f62011-01-03 19:51:09 +0100471 * We're getting a sta pointer in, so must be under
472 * appropriate locking for sta_info_get().
Johannes Berg3b967662008-04-08 17:56:52 +0200473 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100474
Johannes Berg11a843b2007-08-28 17:01:55 -0400475 /* same here, the AP could be using QoS */
Johannes Bergabe60632009-11-25 17:46:18 +0100476 ap = sta_info_get(key->sdata, key->sdata->u.mgd.bssid);
Johannes Berg11a843b2007-08-28 17:01:55 -0400477 if (ap) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200478 if (test_sta_flag(ap, WLAN_STA_WME))
Johannes Berg11a843b2007-08-28 17:01:55 -0400479 key->conf.flags |=
480 IEEE80211_KEY_FLAG_WMM_STA;
Johannes Berg11a843b2007-08-28 17:01:55 -0400481 }
482 }
Johannes Berg11a843b2007-08-28 17:01:55 -0400483 }
484
Johannes Bergad0e2b52010-06-01 10:19:19 +0200485 mutex_lock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200486
Johannes Berge31b8212010-10-05 19:39:30 +0200487 if (sta && pairwise)
Johannes Berg40b275b2011-05-13 14:15:49 +0200488 old_key = key_mtx_dereference(sdata->local, sta->ptk);
Johannes Berge31b8212010-10-05 19:39:30 +0200489 else if (sta)
Johannes Berg40b275b2011-05-13 14:15:49 +0200490 old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400491 else
Johannes Berg40b275b2011-05-13 14:15:49 +0200492 old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
Johannes Bergdb4d1162008-02-25 16:27:45 +0100493
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530494 increment_tailroom_need_count(sdata);
495
Johannes Berge31b8212010-10-05 19:39:30 +0200496 __ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200497 __ieee80211_key_destroy(old_key);
Johannes Bergd4e46a32007-09-14 11:10:24 -0400498
Johannes Bergad0e2b52010-06-01 10:19:19 +0200499 ieee80211_debugfs_key_add(key);
Johannes Berg3b967662008-04-08 17:56:52 +0200500
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300501 ret = ieee80211_key_enable_hw_accel(key);
Johannes Berg523d2f62009-07-01 21:26:43 +0200502
Johannes Bergad0e2b52010-06-01 10:19:19 +0200503 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3ffc2a92010-08-27 14:26:52 +0300504
505 return ret;
Johannes Berg3a245762008-04-09 16:45:37 +0200506}
507
Johannes Berg5c0c3642011-05-12 14:31:49 +0200508void __ieee80211_key_free(struct ieee80211_key *key)
Johannes Berg3a245762008-04-09 16:45:37 +0200509{
Johannes Berg5c0c3642011-05-12 14:31:49 +0200510 if (!key)
511 return;
512
Johannes Berg3a245762008-04-09 16:45:37 +0200513 /*
514 * Replace key with nothingness if it was ever used.
515 */
516 if (key->sdata)
517 __ieee80211_key_replace(key->sdata, key->sta,
Johannes Berge31b8212010-10-05 19:39:30 +0200518 key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
519 key, NULL);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200520 __ieee80211_key_destroy(key);
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200521}
522
Jouni Malinen32162a42010-07-26 15:52:03 -0700523void ieee80211_key_free(struct ieee80211_local *local,
524 struct ieee80211_key *key)
Johannes Berg1f5a7e42007-07-27 15:43:23 +0200525{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200526 mutex_lock(&local->key_mtx);
Johannes Berg3a245762008-04-09 16:45:37 +0200527 __ieee80211_key_free(key);
Johannes Bergad0e2b52010-06-01 10:19:19 +0200528 mutex_unlock(&local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200529}
530
531void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
532{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200533 struct ieee80211_key *key;
534
Johannes Berg3a245762008-04-09 16:45:37 +0200535 ASSERT_RTNL();
Johannes Berg3b967662008-04-08 17:56:52 +0200536
Johannes Berg9607e6b2009-12-23 13:15:31 +0100537 if (WARN_ON(!ieee80211_sdata_running(sdata)))
Johannes Berg3b967662008-04-08 17:56:52 +0200538 return;
539
Johannes Bergad0e2b52010-06-01 10:19:19 +0200540 mutex_lock(&sdata->local->key_mtx);
541
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530542 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 Bergad0e2b52010-06-01 10:19:19 +0200546 ieee80211_key_enable_hw_accel(key);
Yogesh Ashok Powar3bff1862011-06-28 18:41:37 +0530547 }
Johannes Bergad0e2b52010-06-01 10:19:19 +0200548
549 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200550}
551
Johannes Berg830af022011-07-05 16:35:39 +0200552void 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}
583EXPORT_SYMBOL(ieee80211_iter_keys);
584
Johannes Berg3b967662008-04-08 17:56:52 +0200585void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
586{
Johannes Bergad0e2b52010-06-01 10:19:19 +0200587 struct ieee80211_key *key;
588
Johannes Berg3a245762008-04-09 16:45:37 +0200589 ASSERT_RTNL();
Johannes Berg3b967662008-04-08 17:56:52 +0200590
Johannes Bergad0e2b52010-06-01 10:19:19 +0200591 mutex_lock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200592
Johannes Bergad0e2b52010-06-01 10:19:19 +0200593 list_for_each_entry(key, &sdata->key_list, list)
594 ieee80211_key_disable_hw_accel(key);
Johannes Berg3b967662008-04-08 17:56:52 +0200595
Johannes Bergad0e2b52010-06-01 10:19:19 +0200596 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg11a843b2007-08-28 17:01:55 -0400597}
598
599void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
600{
601 struct ieee80211_key *key, *tmp;
Johannes Bergdb4d1162008-02-25 16:27:45 +0100602
Johannes Bergad0e2b52010-06-01 10:19:19 +0200603 mutex_lock(&sdata->local->key_mtx);
Johannes Berg3b967662008-04-08 17:56:52 +0200604
Jouni Malinen3cfcf6a2009-01-08 13:32:02 +0200605 ieee80211_debugfs_key_remove_mgmt_default(sdata);
Johannes Berg11a843b2007-08-28 17:01:55 -0400606
607 list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
Johannes Berg3a245762008-04-09 16:45:37 +0200608 __ieee80211_key_free(key);
Johannes Berg11a843b2007-08-28 17:01:55 -0400609
Johannes Bergf7e01042010-12-09 19:49:02 +0100610 ieee80211_debugfs_key_update_default(sdata);
611
Johannes Bergad0e2b52010-06-01 10:19:19 +0200612 mutex_unlock(&sdata->local->key_mtx);
Johannes Berg11a843b2007-08-28 17:01:55 -0400613}
Johannes Bergc68f4b82011-07-05 16:35:41 +0200614
615
616void 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}
625EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
Johannes Berg3ea542d2011-07-07 18:58:00 +0200626
627void 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}
665EXPORT_SYMBOL(ieee80211_get_key_tx_seq);
666
667void 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}
699EXPORT_SYMBOL(ieee80211_get_key_rx_seq);