2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/if_ether.h>
14 #include <linux/etherdevice.h>
15 #include <linux/list.h>
16 #include <linux/rcupdate.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/slab.h>
19 #include <linux/export.h>
20 #include <net/mac80211.h>
21 #include <asm/unaligned.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
24 #include "debugfs_key.h"
32 * DOC: Key handling basics
34 * Key handling in mac80211 is done based on per-interface (sub_if_data)
35 * keys and per-station keys. Since each station belongs to an interface,
36 * each station key also belongs to that interface.
38 * Hardware acceleration is done on a best-effort basis for algorithms
39 * that are implemented in software, for each key the hardware is asked
40 * to enable that key for offloading but if it cannot do that the key is
41 * simply kept for software encryption (unless it is for an algorithm
42 * that isn't implemented in software).
43 * There is currently no way of knowing whether a key is handled in SW
44 * or HW except by looking into debugfs.
46 * All key management is internally protected by a mutex. Within all
47 * other parts of mac80211, key references are, just as STA structure
48 * references, protected by RCU. Note, however, that some things are
49 * unprotected, namely the key->sta dereferences within the hardware
50 * acceleration functions. This means that sta_info_destroy() must
51 * remove the key which waits for an RCU grace period.
54 static const u8 bcast_addr
[ETH_ALEN
] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
56 static void assert_key_lock(struct ieee80211_local
*local
)
58 lockdep_assert_held(&local
->key_mtx
);
61 static void increment_tailroom_need_count(struct ieee80211_sub_if_data
*sdata
)
64 * When this count is zero, SKB resizing for allocating tailroom
65 * for IV or MMIC is skipped. But, this check has created two race
66 * cases in xmit path while transiting from zero count to one:
68 * 1. SKB resize was skipped because no key was added but just before
69 * the xmit key is added and SW encryption kicks off.
71 * 2. SKB resize was skipped because all the keys were hw planted but
72 * just before xmit one of the key is deleted and SW encryption kicks
75 * In both the above case SW encryption will find not enough space for
76 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
78 * Solution has been explained at
79 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
82 if (!sdata
->crypto_tx_tailroom_needed_cnt
++) {
84 * Flush all XMIT packets currently using HW encryption or no
85 * encryption at all if the count transition is from 0 -> 1.
91 static int ieee80211_key_enable_hw_accel(struct ieee80211_key
*key
)
93 struct ieee80211_sub_if_data
*sdata
;
95 int ret
= -EOPNOTSUPP
;
99 if (key
->flags
& KEY_FLAG_TAINTED
) {
100 /* If we get here, it's during resume and the key is
101 * tainted so shouldn't be used/programmed any more.
102 * However, its flags may still indicate that it was
103 * programmed into the device (since we're in resume)
104 * so clear that flag now to avoid trying to remove
107 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
111 if (!key
->local
->ops
->set_key
)
112 goto out_unsupported
;
114 assert_key_lock(key
->local
);
119 * If this is a per-STA GTK, check if it
120 * is supported; if not, return.
122 if (sta
&& !(key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
) &&
123 !(key
->local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PER_STA_GTK
))
124 goto out_unsupported
;
126 if (sta
&& !sta
->uploaded
)
127 goto out_unsupported
;
130 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
132 * The driver doesn't know anything about VLAN interfaces.
133 * Hence, don't send GTKs for VLAN interfaces to the driver.
135 if (!(key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
))
136 goto out_unsupported
;
139 ret
= drv_set_key(key
->local
, SET_KEY
, sdata
,
140 sta
? &sta
->sta
: NULL
, &key
->conf
);
143 key
->flags
|= KEY_FLAG_UPLOADED_TO_HARDWARE
;
145 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
146 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
147 sdata
->crypto_tx_tailroom_needed_cnt
--;
149 WARN_ON((key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
) &&
150 (key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
));
155 if (ret
!= -ENOSPC
&& ret
!= -EOPNOTSUPP
&& ret
!= 1)
157 "failed to set key (%d, %pM) to hardware (%d)\n",
159 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
162 switch (key
->conf
.cipher
) {
163 case WLAN_CIPHER_SUITE_WEP40
:
164 case WLAN_CIPHER_SUITE_WEP104
:
165 case WLAN_CIPHER_SUITE_TKIP
:
166 case WLAN_CIPHER_SUITE_CCMP
:
167 case WLAN_CIPHER_SUITE_CCMP_256
:
168 case WLAN_CIPHER_SUITE_AES_CMAC
:
169 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
170 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
171 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
172 case WLAN_CIPHER_SUITE_GCMP
:
173 case WLAN_CIPHER_SUITE_GCMP_256
:
174 /* all of these we can do in software - if driver can */
177 if (key
->local
->hw
.flags
& IEEE80211_HW_SW_CRYPTO_CONTROL
)
185 static void ieee80211_key_disable_hw_accel(struct ieee80211_key
*key
)
187 struct ieee80211_sub_if_data
*sdata
;
188 struct sta_info
*sta
;
193 if (!key
|| !key
->local
->ops
->set_key
)
196 assert_key_lock(key
->local
);
198 if (!(key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
204 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
205 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
206 increment_tailroom_need_count(sdata
);
208 ret
= drv_set_key(key
->local
, DISABLE_KEY
, sdata
,
209 sta
? &sta
->sta
: NULL
, &key
->conf
);
213 "failed to remove key (%d, %pM) from hardware (%d)\n",
215 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
217 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
220 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
,
221 int idx
, bool uni
, bool multi
)
223 struct ieee80211_key
*key
= NULL
;
225 assert_key_lock(sdata
->local
);
227 if (idx
>= 0 && idx
< NUM_DEFAULT_KEYS
)
228 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
231 rcu_assign_pointer(sdata
->default_unicast_key
, key
);
232 drv_set_default_unicast_key(sdata
->local
, sdata
, idx
);
236 rcu_assign_pointer(sdata
->default_multicast_key
, key
);
238 ieee80211_debugfs_key_update_default(sdata
);
241 void ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
, int idx
,
242 bool uni
, bool multi
)
244 mutex_lock(&sdata
->local
->key_mtx
);
245 __ieee80211_set_default_key(sdata
, idx
, uni
, multi
);
246 mutex_unlock(&sdata
->local
->key_mtx
);
250 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
, int idx
)
252 struct ieee80211_key
*key
= NULL
;
254 assert_key_lock(sdata
->local
);
256 if (idx
>= NUM_DEFAULT_KEYS
&&
257 idx
< NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
258 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
260 rcu_assign_pointer(sdata
->default_mgmt_key
, key
);
262 ieee80211_debugfs_key_update_default(sdata
);
265 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
,
268 mutex_lock(&sdata
->local
->key_mtx
);
269 __ieee80211_set_default_mgmt_key(sdata
, idx
);
270 mutex_unlock(&sdata
->local
->key_mtx
);
274 static void ieee80211_key_replace(struct ieee80211_sub_if_data
*sdata
,
275 struct sta_info
*sta
,
277 struct ieee80211_key
*old
,
278 struct ieee80211_key
*new)
281 bool defunikey
, defmultikey
, defmgmtkey
;
283 /* caller must provide at least one old/new */
284 if (WARN_ON(!new && !old
))
288 list_add_tail(&new->list
, &sdata
->key_list
);
290 WARN_ON(new && old
&& new->conf
.keyidx
!= old
->conf
.keyidx
);
293 idx
= old
->conf
.keyidx
;
295 idx
= new->conf
.keyidx
;
299 rcu_assign_pointer(sta
->ptk
[idx
], new);
302 rcu_assign_pointer(sta
->gtk
[idx
], new);
307 old
== key_mtx_dereference(sdata
->local
,
308 sdata
->default_unicast_key
);
310 old
== key_mtx_dereference(sdata
->local
,
311 sdata
->default_multicast_key
);
313 old
== key_mtx_dereference(sdata
->local
,
314 sdata
->default_mgmt_key
);
316 if (defunikey
&& !new)
317 __ieee80211_set_default_key(sdata
, -1, true, false);
318 if (defmultikey
&& !new)
319 __ieee80211_set_default_key(sdata
, -1, false, true);
320 if (defmgmtkey
&& !new)
321 __ieee80211_set_default_mgmt_key(sdata
, -1);
323 rcu_assign_pointer(sdata
->keys
[idx
], new);
324 if (defunikey
&& new)
325 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
327 if (defmultikey
&& new)
328 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
330 if (defmgmtkey
&& new)
331 __ieee80211_set_default_mgmt_key(sdata
,
336 list_del(&old
->list
);
339 struct ieee80211_key
*
340 ieee80211_key_alloc(u32 cipher
, int idx
, size_t key_len
,
342 size_t seq_len
, const u8
*seq
,
343 const struct ieee80211_cipher_scheme
*cs
)
345 struct ieee80211_key
*key
;
348 if (WARN_ON(idx
< 0 || idx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
))
349 return ERR_PTR(-EINVAL
);
351 key
= kzalloc(sizeof(struct ieee80211_key
) + key_len
, GFP_KERNEL
);
353 return ERR_PTR(-ENOMEM
);
356 * Default to software encryption; we'll later upload the
357 * key to the hardware if possible.
362 key
->conf
.cipher
= cipher
;
363 key
->conf
.keyidx
= idx
;
364 key
->conf
.keylen
= key_len
;
366 case WLAN_CIPHER_SUITE_WEP40
:
367 case WLAN_CIPHER_SUITE_WEP104
:
368 key
->conf
.iv_len
= IEEE80211_WEP_IV_LEN
;
369 key
->conf
.icv_len
= IEEE80211_WEP_ICV_LEN
;
371 case WLAN_CIPHER_SUITE_TKIP
:
372 key
->conf
.iv_len
= IEEE80211_TKIP_IV_LEN
;
373 key
->conf
.icv_len
= IEEE80211_TKIP_ICV_LEN
;
375 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
376 key
->u
.tkip
.rx
[i
].iv32
=
377 get_unaligned_le32(&seq
[2]);
378 key
->u
.tkip
.rx
[i
].iv16
=
379 get_unaligned_le16(seq
);
382 spin_lock_init(&key
->u
.tkip
.txlock
);
384 case WLAN_CIPHER_SUITE_CCMP
:
385 key
->conf
.iv_len
= IEEE80211_CCMP_HDR_LEN
;
386 key
->conf
.icv_len
= IEEE80211_CCMP_MIC_LEN
;
388 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
389 for (j
= 0; j
< IEEE80211_CCMP_PN_LEN
; j
++)
390 key
->u
.ccmp
.rx_pn
[i
][j
] =
391 seq
[IEEE80211_CCMP_PN_LEN
- j
- 1];
394 * Initialize AES key state here as an optimization so that
395 * it does not need to be initialized for every packet.
397 key
->u
.ccmp
.tfm
= ieee80211_aes_key_setup_encrypt(
398 key_data
, key_len
, IEEE80211_CCMP_MIC_LEN
);
399 if (IS_ERR(key
->u
.ccmp
.tfm
)) {
400 err
= PTR_ERR(key
->u
.ccmp
.tfm
);
405 case WLAN_CIPHER_SUITE_CCMP_256
:
406 key
->conf
.iv_len
= IEEE80211_CCMP_256_HDR_LEN
;
407 key
->conf
.icv_len
= IEEE80211_CCMP_256_MIC_LEN
;
408 for (i
= 0; seq
&& i
< IEEE80211_NUM_TIDS
+ 1; i
++)
409 for (j
= 0; j
< IEEE80211_CCMP_256_PN_LEN
; j
++)
410 key
->u
.ccmp
.rx_pn
[i
][j
] =
411 seq
[IEEE80211_CCMP_256_PN_LEN
- j
- 1];
412 /* Initialize AES key state here as an optimization so that
413 * it does not need to be initialized for every packet.
415 key
->u
.ccmp
.tfm
= ieee80211_aes_key_setup_encrypt(
416 key_data
, key_len
, IEEE80211_CCMP_256_MIC_LEN
);
417 if (IS_ERR(key
->u
.ccmp
.tfm
)) {
418 err
= PTR_ERR(key
->u
.ccmp
.tfm
);
423 case WLAN_CIPHER_SUITE_AES_CMAC
:
424 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
425 key
->conf
.iv_len
= 0;
426 if (cipher
== WLAN_CIPHER_SUITE_AES_CMAC
)
427 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie
);
429 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie_16
);
431 for (j
= 0; j
< IEEE80211_CMAC_PN_LEN
; j
++)
432 key
->u
.aes_cmac
.rx_pn
[j
] =
433 seq
[IEEE80211_CMAC_PN_LEN
- j
- 1];
435 * Initialize AES key state here as an optimization so that
436 * it does not need to be initialized for every packet.
438 key
->u
.aes_cmac
.tfm
=
439 ieee80211_aes_cmac_key_setup(key_data
, key_len
);
440 if (IS_ERR(key
->u
.aes_cmac
.tfm
)) {
441 err
= PTR_ERR(key
->u
.aes_cmac
.tfm
);
446 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
447 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
448 key
->conf
.iv_len
= 0;
449 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie_16
);
451 for (j
= 0; j
< IEEE80211_GMAC_PN_LEN
; j
++)
452 key
->u
.aes_gmac
.rx_pn
[j
] =
453 seq
[IEEE80211_GMAC_PN_LEN
- j
- 1];
454 /* Initialize AES key state here as an optimization so that
455 * it does not need to be initialized for every packet.
457 key
->u
.aes_gmac
.tfm
=
458 ieee80211_aes_gmac_key_setup(key_data
, key_len
);
459 if (IS_ERR(key
->u
.aes_gmac
.tfm
)) {
460 err
= PTR_ERR(key
->u
.aes_gmac
.tfm
);
465 case WLAN_CIPHER_SUITE_GCMP
:
466 case WLAN_CIPHER_SUITE_GCMP_256
:
467 key
->conf
.iv_len
= IEEE80211_GCMP_HDR_LEN
;
468 key
->conf
.icv_len
= IEEE80211_GCMP_MIC_LEN
;
469 for (i
= 0; seq
&& i
< IEEE80211_NUM_TIDS
+ 1; i
++)
470 for (j
= 0; j
< IEEE80211_GCMP_PN_LEN
; j
++)
471 key
->u
.gcmp
.rx_pn
[i
][j
] =
472 seq
[IEEE80211_GCMP_PN_LEN
- j
- 1];
473 /* Initialize AES key state here as an optimization so that
474 * it does not need to be initialized for every packet.
476 key
->u
.gcmp
.tfm
= ieee80211_aes_gcm_key_setup_encrypt(key_data
,
478 if (IS_ERR(key
->u
.gcmp
.tfm
)) {
479 err
= PTR_ERR(key
->u
.gcmp
.tfm
);
486 size_t len
= (seq_len
> MAX_PN_LEN
) ?
487 MAX_PN_LEN
: seq_len
;
489 key
->conf
.iv_len
= cs
->hdr_len
;
490 key
->conf
.icv_len
= cs
->mic_len
;
491 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
492 for (j
= 0; j
< len
; j
++)
493 key
->u
.gen
.rx_pn
[i
][j
] =
497 memcpy(key
->conf
.key
, key_data
, key_len
);
498 INIT_LIST_HEAD(&key
->list
);
503 static void ieee80211_key_free_common(struct ieee80211_key
*key
)
505 switch (key
->conf
.cipher
) {
506 case WLAN_CIPHER_SUITE_CCMP
:
507 case WLAN_CIPHER_SUITE_CCMP_256
:
508 ieee80211_aes_key_free(key
->u
.ccmp
.tfm
);
510 case WLAN_CIPHER_SUITE_AES_CMAC
:
511 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
512 ieee80211_aes_cmac_key_free(key
->u
.aes_cmac
.tfm
);
514 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
515 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
516 ieee80211_aes_gmac_key_free(key
->u
.aes_gmac
.tfm
);
518 case WLAN_CIPHER_SUITE_GCMP
:
519 case WLAN_CIPHER_SUITE_GCMP_256
:
520 ieee80211_aes_gcm_key_free(key
->u
.gcmp
.tfm
);
526 static void __ieee80211_key_destroy(struct ieee80211_key
*key
,
530 ieee80211_key_disable_hw_accel(key
);
533 struct ieee80211_sub_if_data
*sdata
= key
->sdata
;
535 ieee80211_debugfs_key_remove(key
);
537 if (delay_tailroom
) {
538 /* see ieee80211_delayed_tailroom_dec */
539 sdata
->crypto_tx_tailroom_pending_dec
++;
540 schedule_delayed_work(&sdata
->dec_tailroom_needed_wk
,
543 sdata
->crypto_tx_tailroom_needed_cnt
--;
547 ieee80211_key_free_common(key
);
550 static void ieee80211_key_destroy(struct ieee80211_key
*key
,
557 * Synchronize so the TX path can no longer be using
558 * this key before we free/remove it.
562 __ieee80211_key_destroy(key
, delay_tailroom
);
565 void ieee80211_key_free_unused(struct ieee80211_key
*key
)
567 WARN_ON(key
->sdata
|| key
->local
);
568 ieee80211_key_free_common(key
);
571 int ieee80211_key_link(struct ieee80211_key
*key
,
572 struct ieee80211_sub_if_data
*sdata
,
573 struct sta_info
*sta
)
575 struct ieee80211_local
*local
= sdata
->local
;
576 struct ieee80211_key
*old_key
;
580 pairwise
= key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
;
581 idx
= key
->conf
.keyidx
;
582 key
->local
= sdata
->local
;
586 mutex_lock(&sdata
->local
->key_mtx
);
589 old_key
= key_mtx_dereference(sdata
->local
, sta
->ptk
[idx
]);
591 old_key
= key_mtx_dereference(sdata
->local
, sta
->gtk
[idx
]);
593 old_key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
595 increment_tailroom_need_count(sdata
);
597 ieee80211_key_replace(sdata
, sta
, pairwise
, old_key
, key
);
598 ieee80211_key_destroy(old_key
, true);
600 ieee80211_debugfs_key_add(key
);
602 if (!local
->wowlan
) {
603 ret
= ieee80211_key_enable_hw_accel(key
);
605 ieee80211_key_free(key
, true);
610 mutex_unlock(&sdata
->local
->key_mtx
);
615 void ieee80211_key_free(struct ieee80211_key
*key
, bool delay_tailroom
)
621 * Replace key with nothingness if it was ever used.
624 ieee80211_key_replace(key
->sdata
, key
->sta
,
625 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
627 ieee80211_key_destroy(key
, delay_tailroom
);
630 void ieee80211_enable_keys(struct ieee80211_sub_if_data
*sdata
)
632 struct ieee80211_key
*key
;
636 if (WARN_ON(!ieee80211_sdata_running(sdata
)))
639 mutex_lock(&sdata
->local
->key_mtx
);
641 sdata
->crypto_tx_tailroom_needed_cnt
= 0;
643 list_for_each_entry(key
, &sdata
->key_list
, list
) {
644 increment_tailroom_need_count(sdata
);
645 ieee80211_key_enable_hw_accel(key
);
648 mutex_unlock(&sdata
->local
->key_mtx
);
651 void ieee80211_iter_keys(struct ieee80211_hw
*hw
,
652 struct ieee80211_vif
*vif
,
653 void (*iter
)(struct ieee80211_hw
*hw
,
654 struct ieee80211_vif
*vif
,
655 struct ieee80211_sta
*sta
,
656 struct ieee80211_key_conf
*key
,
660 struct ieee80211_local
*local
= hw_to_local(hw
);
661 struct ieee80211_key
*key
, *tmp
;
662 struct ieee80211_sub_if_data
*sdata
;
666 mutex_lock(&local
->key_mtx
);
668 sdata
= vif_to_sdata(vif
);
669 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
)
670 iter(hw
, &sdata
->vif
,
671 key
->sta
? &key
->sta
->sta
: NULL
,
672 &key
->conf
, iter_data
);
674 list_for_each_entry(sdata
, &local
->interfaces
, list
)
675 list_for_each_entry_safe(key
, tmp
,
676 &sdata
->key_list
, list
)
677 iter(hw
, &sdata
->vif
,
678 key
->sta
? &key
->sta
->sta
: NULL
,
679 &key
->conf
, iter_data
);
681 mutex_unlock(&local
->key_mtx
);
683 EXPORT_SYMBOL(ieee80211_iter_keys
);
685 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data
*sdata
,
686 struct list_head
*keys
)
688 struct ieee80211_key
*key
, *tmp
;
690 sdata
->crypto_tx_tailroom_needed_cnt
-=
691 sdata
->crypto_tx_tailroom_pending_dec
;
692 sdata
->crypto_tx_tailroom_pending_dec
= 0;
694 ieee80211_debugfs_key_remove_mgmt_default(sdata
);
696 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
) {
697 ieee80211_key_replace(key
->sdata
, key
->sta
,
698 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
700 list_add_tail(&key
->list
, keys
);
703 ieee80211_debugfs_key_update_default(sdata
);
706 void ieee80211_free_keys(struct ieee80211_sub_if_data
*sdata
,
707 bool force_synchronize
)
709 struct ieee80211_local
*local
= sdata
->local
;
710 struct ieee80211_sub_if_data
*vlan
;
711 struct ieee80211_key
*key
, *tmp
;
714 cancel_delayed_work_sync(&sdata
->dec_tailroom_needed_wk
);
716 mutex_lock(&local
->key_mtx
);
718 ieee80211_free_keys_iface(sdata
, &keys
);
720 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
721 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
722 ieee80211_free_keys_iface(vlan
, &keys
);
725 if (!list_empty(&keys
) || force_synchronize
)
727 list_for_each_entry_safe(key
, tmp
, &keys
, list
)
728 __ieee80211_key_destroy(key
, false);
730 WARN_ON_ONCE(sdata
->crypto_tx_tailroom_needed_cnt
||
731 sdata
->crypto_tx_tailroom_pending_dec
);
732 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
733 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
734 WARN_ON_ONCE(vlan
->crypto_tx_tailroom_needed_cnt
||
735 vlan
->crypto_tx_tailroom_pending_dec
);
738 mutex_unlock(&local
->key_mtx
);
741 void ieee80211_free_sta_keys(struct ieee80211_local
*local
,
742 struct sta_info
*sta
)
744 struct ieee80211_key
*key
;
747 mutex_lock(&local
->key_mtx
);
748 for (i
= 0; i
< ARRAY_SIZE(sta
->gtk
); i
++) {
749 key
= key_mtx_dereference(local
, sta
->gtk
[i
]);
752 ieee80211_key_replace(key
->sdata
, key
->sta
,
753 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
755 __ieee80211_key_destroy(key
, true);
758 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
759 key
= key_mtx_dereference(local
, sta
->ptk
[i
]);
762 ieee80211_key_replace(key
->sdata
, key
->sta
,
763 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
765 __ieee80211_key_destroy(key
, true);
768 mutex_unlock(&local
->key_mtx
);
771 void ieee80211_delayed_tailroom_dec(struct work_struct
*wk
)
773 struct ieee80211_sub_if_data
*sdata
;
775 sdata
= container_of(wk
, struct ieee80211_sub_if_data
,
776 dec_tailroom_needed_wk
.work
);
779 * The reason for the delayed tailroom needed decrementing is to
780 * make roaming faster: during roaming, all keys are first deleted
781 * and then new keys are installed. The first new key causes the
782 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
783 * the cost of synchronize_net() (which can be slow). Avoid this
784 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
785 * key removal for a while, so if we roam the value is larger than
786 * zero and no 0->1 transition happens.
788 * The cost is that if the AP switching was from an AP with keys
789 * to one without, we still allocate tailroom while it would no
790 * longer be needed. However, in the typical (fast) roaming case
791 * within an ESS this usually won't happen.
794 mutex_lock(&sdata
->local
->key_mtx
);
795 sdata
->crypto_tx_tailroom_needed_cnt
-=
796 sdata
->crypto_tx_tailroom_pending_dec
;
797 sdata
->crypto_tx_tailroom_pending_dec
= 0;
798 mutex_unlock(&sdata
->local
->key_mtx
);
801 void ieee80211_gtk_rekey_notify(struct ieee80211_vif
*vif
, const u8
*bssid
,
802 const u8
*replay_ctr
, gfp_t gfp
)
804 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
806 trace_api_gtk_rekey_notify(sdata
, bssid
, replay_ctr
);
808 cfg80211_gtk_rekey_notify(sdata
->dev
, bssid
, replay_ctr
, gfp
);
810 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify
);
812 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
813 struct ieee80211_key_seq
*seq
)
815 struct ieee80211_key
*key
;
818 if (WARN_ON(!(keyconf
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
)))
821 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
823 switch (key
->conf
.cipher
) {
824 case WLAN_CIPHER_SUITE_TKIP
:
825 seq
->tkip
.iv32
= key
->u
.tkip
.tx
.iv32
;
826 seq
->tkip
.iv16
= key
->u
.tkip
.tx
.iv16
;
828 case WLAN_CIPHER_SUITE_CCMP
:
829 case WLAN_CIPHER_SUITE_CCMP_256
:
830 pn64
= atomic64_read(&key
->u
.ccmp
.tx_pn
);
831 seq
->ccmp
.pn
[5] = pn64
;
832 seq
->ccmp
.pn
[4] = pn64
>> 8;
833 seq
->ccmp
.pn
[3] = pn64
>> 16;
834 seq
->ccmp
.pn
[2] = pn64
>> 24;
835 seq
->ccmp
.pn
[1] = pn64
>> 32;
836 seq
->ccmp
.pn
[0] = pn64
>> 40;
838 case WLAN_CIPHER_SUITE_AES_CMAC
:
839 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
840 pn64
= atomic64_read(&key
->u
.aes_cmac
.tx_pn
);
841 seq
->ccmp
.pn
[5] = pn64
;
842 seq
->ccmp
.pn
[4] = pn64
>> 8;
843 seq
->ccmp
.pn
[3] = pn64
>> 16;
844 seq
->ccmp
.pn
[2] = pn64
>> 24;
845 seq
->ccmp
.pn
[1] = pn64
>> 32;
846 seq
->ccmp
.pn
[0] = pn64
>> 40;
848 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
849 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
850 pn64
= atomic64_read(&key
->u
.aes_gmac
.tx_pn
);
851 seq
->ccmp
.pn
[5] = pn64
;
852 seq
->ccmp
.pn
[4] = pn64
>> 8;
853 seq
->ccmp
.pn
[3] = pn64
>> 16;
854 seq
->ccmp
.pn
[2] = pn64
>> 24;
855 seq
->ccmp
.pn
[1] = pn64
>> 32;
856 seq
->ccmp
.pn
[0] = pn64
>> 40;
858 case WLAN_CIPHER_SUITE_GCMP
:
859 case WLAN_CIPHER_SUITE_GCMP_256
:
860 pn64
= atomic64_read(&key
->u
.gcmp
.tx_pn
);
861 seq
->gcmp
.pn
[5] = pn64
;
862 seq
->gcmp
.pn
[4] = pn64
>> 8;
863 seq
->gcmp
.pn
[3] = pn64
>> 16;
864 seq
->gcmp
.pn
[2] = pn64
>> 24;
865 seq
->gcmp
.pn
[1] = pn64
>> 32;
866 seq
->gcmp
.pn
[0] = pn64
>> 40;
872 EXPORT_SYMBOL(ieee80211_get_key_tx_seq
);
874 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
875 int tid
, struct ieee80211_key_seq
*seq
)
877 struct ieee80211_key
*key
;
880 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
882 switch (key
->conf
.cipher
) {
883 case WLAN_CIPHER_SUITE_TKIP
:
884 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
886 seq
->tkip
.iv32
= key
->u
.tkip
.rx
[tid
].iv32
;
887 seq
->tkip
.iv16
= key
->u
.tkip
.rx
[tid
].iv16
;
889 case WLAN_CIPHER_SUITE_CCMP
:
890 case WLAN_CIPHER_SUITE_CCMP_256
:
891 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
894 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
896 pn
= key
->u
.ccmp
.rx_pn
[tid
];
897 memcpy(seq
->ccmp
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
899 case WLAN_CIPHER_SUITE_AES_CMAC
:
900 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
901 if (WARN_ON(tid
!= 0))
903 pn
= key
->u
.aes_cmac
.rx_pn
;
904 memcpy(seq
->aes_cmac
.pn
, pn
, IEEE80211_CMAC_PN_LEN
);
906 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
907 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
908 if (WARN_ON(tid
!= 0))
910 pn
= key
->u
.aes_gmac
.rx_pn
;
911 memcpy(seq
->aes_gmac
.pn
, pn
, IEEE80211_GMAC_PN_LEN
);
913 case WLAN_CIPHER_SUITE_GCMP
:
914 case WLAN_CIPHER_SUITE_GCMP_256
:
915 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
918 pn
= key
->u
.gcmp
.rx_pn
[IEEE80211_NUM_TIDS
];
920 pn
= key
->u
.gcmp
.rx_pn
[tid
];
921 memcpy(seq
->gcmp
.pn
, pn
, IEEE80211_GCMP_PN_LEN
);
925 EXPORT_SYMBOL(ieee80211_get_key_rx_seq
);
927 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
928 struct ieee80211_key_seq
*seq
)
930 struct ieee80211_key
*key
;
933 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
935 switch (key
->conf
.cipher
) {
936 case WLAN_CIPHER_SUITE_TKIP
:
937 key
->u
.tkip
.tx
.iv32
= seq
->tkip
.iv32
;
938 key
->u
.tkip
.tx
.iv16
= seq
->tkip
.iv16
;
940 case WLAN_CIPHER_SUITE_CCMP
:
941 case WLAN_CIPHER_SUITE_CCMP_256
:
942 pn64
= (u64
)seq
->ccmp
.pn
[5] |
943 ((u64
)seq
->ccmp
.pn
[4] << 8) |
944 ((u64
)seq
->ccmp
.pn
[3] << 16) |
945 ((u64
)seq
->ccmp
.pn
[2] << 24) |
946 ((u64
)seq
->ccmp
.pn
[1] << 32) |
947 ((u64
)seq
->ccmp
.pn
[0] << 40);
948 atomic64_set(&key
->u
.ccmp
.tx_pn
, pn64
);
950 case WLAN_CIPHER_SUITE_AES_CMAC
:
951 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
952 pn64
= (u64
)seq
->aes_cmac
.pn
[5] |
953 ((u64
)seq
->aes_cmac
.pn
[4] << 8) |
954 ((u64
)seq
->aes_cmac
.pn
[3] << 16) |
955 ((u64
)seq
->aes_cmac
.pn
[2] << 24) |
956 ((u64
)seq
->aes_cmac
.pn
[1] << 32) |
957 ((u64
)seq
->aes_cmac
.pn
[0] << 40);
958 atomic64_set(&key
->u
.aes_cmac
.tx_pn
, pn64
);
960 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
961 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
962 pn64
= (u64
)seq
->aes_gmac
.pn
[5] |
963 ((u64
)seq
->aes_gmac
.pn
[4] << 8) |
964 ((u64
)seq
->aes_gmac
.pn
[3] << 16) |
965 ((u64
)seq
->aes_gmac
.pn
[2] << 24) |
966 ((u64
)seq
->aes_gmac
.pn
[1] << 32) |
967 ((u64
)seq
->aes_gmac
.pn
[0] << 40);
968 atomic64_set(&key
->u
.aes_gmac
.tx_pn
, pn64
);
970 case WLAN_CIPHER_SUITE_GCMP
:
971 case WLAN_CIPHER_SUITE_GCMP_256
:
972 pn64
= (u64
)seq
->gcmp
.pn
[5] |
973 ((u64
)seq
->gcmp
.pn
[4] << 8) |
974 ((u64
)seq
->gcmp
.pn
[3] << 16) |
975 ((u64
)seq
->gcmp
.pn
[2] << 24) |
976 ((u64
)seq
->gcmp
.pn
[1] << 32) |
977 ((u64
)seq
->gcmp
.pn
[0] << 40);
978 atomic64_set(&key
->u
.gcmp
.tx_pn
, pn64
);
985 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq
);
987 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
988 int tid
, struct ieee80211_key_seq
*seq
)
990 struct ieee80211_key
*key
;
993 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
995 switch (key
->conf
.cipher
) {
996 case WLAN_CIPHER_SUITE_TKIP
:
997 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
999 key
->u
.tkip
.rx
[tid
].iv32
= seq
->tkip
.iv32
;
1000 key
->u
.tkip
.rx
[tid
].iv16
= seq
->tkip
.iv16
;
1002 case WLAN_CIPHER_SUITE_CCMP
:
1003 case WLAN_CIPHER_SUITE_CCMP_256
:
1004 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
1007 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
1009 pn
= key
->u
.ccmp
.rx_pn
[tid
];
1010 memcpy(pn
, seq
->ccmp
.pn
, IEEE80211_CCMP_PN_LEN
);
1012 case WLAN_CIPHER_SUITE_AES_CMAC
:
1013 case WLAN_CIPHER_SUITE_BIP_CMAC_256
:
1014 if (WARN_ON(tid
!= 0))
1016 pn
= key
->u
.aes_cmac
.rx_pn
;
1017 memcpy(pn
, seq
->aes_cmac
.pn
, IEEE80211_CMAC_PN_LEN
);
1019 case WLAN_CIPHER_SUITE_BIP_GMAC_128
:
1020 case WLAN_CIPHER_SUITE_BIP_GMAC_256
:
1021 if (WARN_ON(tid
!= 0))
1023 pn
= key
->u
.aes_gmac
.rx_pn
;
1024 memcpy(pn
, seq
->aes_gmac
.pn
, IEEE80211_GMAC_PN_LEN
);
1026 case WLAN_CIPHER_SUITE_GCMP
:
1027 case WLAN_CIPHER_SUITE_GCMP_256
:
1028 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
1031 pn
= key
->u
.gcmp
.rx_pn
[IEEE80211_NUM_TIDS
];
1033 pn
= key
->u
.gcmp
.rx_pn
[tid
];
1034 memcpy(pn
, seq
->gcmp
.pn
, IEEE80211_GCMP_PN_LEN
);
1041 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq
);
1043 void ieee80211_remove_key(struct ieee80211_key_conf
*keyconf
)
1045 struct ieee80211_key
*key
;
1047 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
1049 assert_key_lock(key
->local
);
1052 * if key was uploaded, we assume the driver will/has remove(d)
1053 * it, so adjust bookkeeping accordingly
1055 if (key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
) {
1056 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
1058 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
1059 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
1060 increment_tailroom_need_count(key
->sdata
);
1063 ieee80211_key_free(key
, false);
1065 EXPORT_SYMBOL_GPL(ieee80211_remove_key
);
1067 struct ieee80211_key_conf
*
1068 ieee80211_gtk_rekey_add(struct ieee80211_vif
*vif
,
1069 struct ieee80211_key_conf
*keyconf
)
1071 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
1072 struct ieee80211_local
*local
= sdata
->local
;
1073 struct ieee80211_key
*key
;
1076 if (WARN_ON(!local
->wowlan
))
1077 return ERR_PTR(-EINVAL
);
1079 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
1080 return ERR_PTR(-EINVAL
);
1082 key
= ieee80211_key_alloc(keyconf
->cipher
, keyconf
->keyidx
,
1083 keyconf
->keylen
, keyconf
->key
,
1086 return ERR_CAST(key
);
1088 if (sdata
->u
.mgd
.mfp
!= IEEE80211_MFP_DISABLED
)
1089 key
->conf
.flags
|= IEEE80211_KEY_FLAG_RX_MGMT
;
1091 err
= ieee80211_key_link(key
, sdata
, NULL
);
1093 return ERR_PTR(err
);
1097 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add
);