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"
30 * DOC: Key handling basics
32 * Key handling in mac80211 is done based on per-interface (sub_if_data)
33 * keys and per-station keys. Since each station belongs to an interface,
34 * each station key also belongs to that interface.
36 * Hardware acceleration is done on a best-effort basis for algorithms
37 * that are implemented in software, for each key the hardware is asked
38 * to enable that key for offloading but if it cannot do that the key is
39 * simply kept for software encryption (unless it is for an algorithm
40 * that isn't implemented in software).
41 * There is currently no way of knowing whether a key is handled in SW
42 * or HW except by looking into debugfs.
44 * All key management is internally protected by a mutex. Within all
45 * other parts of mac80211, key references are, just as STA structure
46 * references, protected by RCU. Note, however, that some things are
47 * unprotected, namely the key->sta dereferences within the hardware
48 * acceleration functions. This means that sta_info_destroy() must
49 * remove the key which waits for an RCU grace period.
52 static const u8 bcast_addr
[ETH_ALEN
] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
54 static void assert_key_lock(struct ieee80211_local
*local
)
56 lockdep_assert_held(&local
->key_mtx
);
59 static void increment_tailroom_need_count(struct ieee80211_sub_if_data
*sdata
)
62 * When this count is zero, SKB resizing for allocating tailroom
63 * for IV or MMIC is skipped. But, this check has created two race
64 * cases in xmit path while transiting from zero count to one:
66 * 1. SKB resize was skipped because no key was added but just before
67 * the xmit key is added and SW encryption kicks off.
69 * 2. SKB resize was skipped because all the keys were hw planted but
70 * just before xmit one of the key is deleted and SW encryption kicks
73 * In both the above case SW encryption will find not enough space for
74 * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
76 * Solution has been explained at
77 * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
80 if (!sdata
->crypto_tx_tailroom_needed_cnt
++) {
82 * Flush all XMIT packets currently using HW encryption or no
83 * encryption at all if the count transition is from 0 -> 1.
89 static int ieee80211_key_enable_hw_accel(struct ieee80211_key
*key
)
91 struct ieee80211_sub_if_data
*sdata
;
93 int ret
= -EOPNOTSUPP
;
97 if (key
->flags
& KEY_FLAG_TAINTED
) {
98 /* If we get here, it's during resume and the key is
99 * tainted so shouldn't be used/programmed any more.
100 * However, its flags may still indicate that it was
101 * programmed into the device (since we're in resume)
102 * so clear that flag now to avoid trying to remove
105 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
109 if (!key
->local
->ops
->set_key
)
110 goto out_unsupported
;
112 assert_key_lock(key
->local
);
117 * If this is a per-STA GTK, check if it
118 * is supported; if not, return.
120 if (sta
&& !(key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
) &&
121 !(key
->local
->hw
.flags
& IEEE80211_HW_SUPPORTS_PER_STA_GTK
))
122 goto out_unsupported
;
124 if (sta
&& !sta
->uploaded
)
125 goto out_unsupported
;
128 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
130 * The driver doesn't know anything about VLAN interfaces.
131 * Hence, don't send GTKs for VLAN interfaces to the driver.
133 if (!(key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
))
134 goto out_unsupported
;
137 ret
= drv_set_key(key
->local
, SET_KEY
, sdata
,
138 sta
? &sta
->sta
: NULL
, &key
->conf
);
141 key
->flags
|= KEY_FLAG_UPLOADED_TO_HARDWARE
;
143 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
144 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
145 sdata
->crypto_tx_tailroom_needed_cnt
--;
147 WARN_ON((key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
) &&
148 (key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
));
153 if (ret
!= -ENOSPC
&& ret
!= -EOPNOTSUPP
&& ret
!= 1)
155 "failed to set key (%d, %pM) to hardware (%d)\n",
157 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
160 switch (key
->conf
.cipher
) {
161 case WLAN_CIPHER_SUITE_WEP40
:
162 case WLAN_CIPHER_SUITE_WEP104
:
163 case WLAN_CIPHER_SUITE_TKIP
:
164 case WLAN_CIPHER_SUITE_CCMP
:
165 case WLAN_CIPHER_SUITE_AES_CMAC
:
166 /* all of these we can do in software - if driver can */
169 if (key
->local
->hw
.flags
& IEEE80211_HW_SW_CRYPTO_CONTROL
)
177 static void ieee80211_key_disable_hw_accel(struct ieee80211_key
*key
)
179 struct ieee80211_sub_if_data
*sdata
;
180 struct sta_info
*sta
;
185 if (!key
|| !key
->local
->ops
->set_key
)
188 assert_key_lock(key
->local
);
190 if (!(key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
196 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
197 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
198 increment_tailroom_need_count(sdata
);
200 ret
= drv_set_key(key
->local
, DISABLE_KEY
, sdata
,
201 sta
? &sta
->sta
: NULL
, &key
->conf
);
205 "failed to remove key (%d, %pM) from hardware (%d)\n",
207 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
209 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
212 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
,
213 int idx
, bool uni
, bool multi
)
215 struct ieee80211_key
*key
= NULL
;
217 assert_key_lock(sdata
->local
);
219 if (idx
>= 0 && idx
< NUM_DEFAULT_KEYS
)
220 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
223 rcu_assign_pointer(sdata
->default_unicast_key
, key
);
224 drv_set_default_unicast_key(sdata
->local
, sdata
, idx
);
228 rcu_assign_pointer(sdata
->default_multicast_key
, key
);
230 ieee80211_debugfs_key_update_default(sdata
);
233 void ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
, int idx
,
234 bool uni
, bool multi
)
236 mutex_lock(&sdata
->local
->key_mtx
);
237 __ieee80211_set_default_key(sdata
, idx
, uni
, multi
);
238 mutex_unlock(&sdata
->local
->key_mtx
);
242 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
, int idx
)
244 struct ieee80211_key
*key
= NULL
;
246 assert_key_lock(sdata
->local
);
248 if (idx
>= NUM_DEFAULT_KEYS
&&
249 idx
< NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
250 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
252 rcu_assign_pointer(sdata
->default_mgmt_key
, key
);
254 ieee80211_debugfs_key_update_default(sdata
);
257 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
,
260 mutex_lock(&sdata
->local
->key_mtx
);
261 __ieee80211_set_default_mgmt_key(sdata
, idx
);
262 mutex_unlock(&sdata
->local
->key_mtx
);
266 static void ieee80211_key_replace(struct ieee80211_sub_if_data
*sdata
,
267 struct sta_info
*sta
,
269 struct ieee80211_key
*old
,
270 struct ieee80211_key
*new)
273 bool defunikey
, defmultikey
, defmgmtkey
;
275 /* caller must provide at least one old/new */
276 if (WARN_ON(!new && !old
))
280 list_add_tail(&new->list
, &sdata
->key_list
);
282 WARN_ON(new && old
&& new->conf
.keyidx
!= old
->conf
.keyidx
);
285 idx
= old
->conf
.keyidx
;
287 idx
= new->conf
.keyidx
;
291 rcu_assign_pointer(sta
->ptk
[idx
], new);
294 rcu_assign_pointer(sta
->gtk
[idx
], new);
299 old
== key_mtx_dereference(sdata
->local
,
300 sdata
->default_unicast_key
);
302 old
== key_mtx_dereference(sdata
->local
,
303 sdata
->default_multicast_key
);
305 old
== key_mtx_dereference(sdata
->local
,
306 sdata
->default_mgmt_key
);
308 if (defunikey
&& !new)
309 __ieee80211_set_default_key(sdata
, -1, true, false);
310 if (defmultikey
&& !new)
311 __ieee80211_set_default_key(sdata
, -1, false, true);
312 if (defmgmtkey
&& !new)
313 __ieee80211_set_default_mgmt_key(sdata
, -1);
315 rcu_assign_pointer(sdata
->keys
[idx
], new);
316 if (defunikey
&& new)
317 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
319 if (defmultikey
&& new)
320 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
322 if (defmgmtkey
&& new)
323 __ieee80211_set_default_mgmt_key(sdata
,
328 list_del(&old
->list
);
331 struct ieee80211_key
*
332 ieee80211_key_alloc(u32 cipher
, int idx
, size_t key_len
,
334 size_t seq_len
, const u8
*seq
,
335 const struct ieee80211_cipher_scheme
*cs
)
337 struct ieee80211_key
*key
;
340 if (WARN_ON(idx
< 0 || idx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
))
341 return ERR_PTR(-EINVAL
);
343 key
= kzalloc(sizeof(struct ieee80211_key
) + key_len
, GFP_KERNEL
);
345 return ERR_PTR(-ENOMEM
);
348 * Default to software encryption; we'll later upload the
349 * key to the hardware if possible.
354 key
->conf
.cipher
= cipher
;
355 key
->conf
.keyidx
= idx
;
356 key
->conf
.keylen
= key_len
;
358 case WLAN_CIPHER_SUITE_WEP40
:
359 case WLAN_CIPHER_SUITE_WEP104
:
360 key
->conf
.iv_len
= IEEE80211_WEP_IV_LEN
;
361 key
->conf
.icv_len
= IEEE80211_WEP_ICV_LEN
;
363 case WLAN_CIPHER_SUITE_TKIP
:
364 key
->conf
.iv_len
= IEEE80211_TKIP_IV_LEN
;
365 key
->conf
.icv_len
= IEEE80211_TKIP_ICV_LEN
;
367 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
368 key
->u
.tkip
.rx
[i
].iv32
=
369 get_unaligned_le32(&seq
[2]);
370 key
->u
.tkip
.rx
[i
].iv16
=
371 get_unaligned_le16(seq
);
374 spin_lock_init(&key
->u
.tkip
.txlock
);
376 case WLAN_CIPHER_SUITE_CCMP
:
377 key
->conf
.iv_len
= IEEE80211_CCMP_HDR_LEN
;
378 key
->conf
.icv_len
= IEEE80211_CCMP_MIC_LEN
;
380 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
381 for (j
= 0; j
< IEEE80211_CCMP_PN_LEN
; j
++)
382 key
->u
.ccmp
.rx_pn
[i
][j
] =
383 seq
[IEEE80211_CCMP_PN_LEN
- j
- 1];
386 * Initialize AES key state here as an optimization so that
387 * it does not need to be initialized for every packet.
389 key
->u
.ccmp
.tfm
= ieee80211_aes_key_setup_encrypt(key_data
);
390 if (IS_ERR(key
->u
.ccmp
.tfm
)) {
391 err
= PTR_ERR(key
->u
.ccmp
.tfm
);
396 case WLAN_CIPHER_SUITE_AES_CMAC
:
397 key
->conf
.iv_len
= 0;
398 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie
);
400 for (j
= 0; j
< IEEE80211_CMAC_PN_LEN
; j
++)
401 key
->u
.aes_cmac
.rx_pn
[j
] =
402 seq
[IEEE80211_CMAC_PN_LEN
- j
- 1];
404 * Initialize AES key state here as an optimization so that
405 * it does not need to be initialized for every packet.
407 key
->u
.aes_cmac
.tfm
=
408 ieee80211_aes_cmac_key_setup(key_data
);
409 if (IS_ERR(key
->u
.aes_cmac
.tfm
)) {
410 err
= PTR_ERR(key
->u
.aes_cmac
.tfm
);
417 size_t len
= (seq_len
> MAX_PN_LEN
) ?
418 MAX_PN_LEN
: seq_len
;
420 key
->conf
.iv_len
= cs
->hdr_len
;
421 key
->conf
.icv_len
= cs
->mic_len
;
422 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
423 for (j
= 0; j
< len
; j
++)
424 key
->u
.gen
.rx_pn
[i
][j
] =
428 memcpy(key
->conf
.key
, key_data
, key_len
);
429 INIT_LIST_HEAD(&key
->list
);
434 static void ieee80211_key_free_common(struct ieee80211_key
*key
)
436 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
)
437 ieee80211_aes_key_free(key
->u
.ccmp
.tfm
);
438 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_AES_CMAC
)
439 ieee80211_aes_cmac_key_free(key
->u
.aes_cmac
.tfm
);
443 static void __ieee80211_key_destroy(struct ieee80211_key
*key
,
447 ieee80211_key_disable_hw_accel(key
);
450 struct ieee80211_sub_if_data
*sdata
= key
->sdata
;
452 ieee80211_debugfs_key_remove(key
);
454 if (delay_tailroom
) {
455 /* see ieee80211_delayed_tailroom_dec */
456 sdata
->crypto_tx_tailroom_pending_dec
++;
457 schedule_delayed_work(&sdata
->dec_tailroom_needed_wk
,
460 sdata
->crypto_tx_tailroom_needed_cnt
--;
464 ieee80211_key_free_common(key
);
467 static void ieee80211_key_destroy(struct ieee80211_key
*key
,
474 * Synchronize so the TX path can no longer be using
475 * this key before we free/remove it.
479 __ieee80211_key_destroy(key
, delay_tailroom
);
482 void ieee80211_key_free_unused(struct ieee80211_key
*key
)
484 WARN_ON(key
->sdata
|| key
->local
);
485 ieee80211_key_free_common(key
);
488 int ieee80211_key_link(struct ieee80211_key
*key
,
489 struct ieee80211_sub_if_data
*sdata
,
490 struct sta_info
*sta
)
492 struct ieee80211_local
*local
= sdata
->local
;
493 struct ieee80211_key
*old_key
;
497 pairwise
= key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
;
498 idx
= key
->conf
.keyidx
;
499 key
->local
= sdata
->local
;
503 mutex_lock(&sdata
->local
->key_mtx
);
506 old_key
= key_mtx_dereference(sdata
->local
, sta
->ptk
[idx
]);
508 old_key
= key_mtx_dereference(sdata
->local
, sta
->gtk
[idx
]);
510 old_key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
512 increment_tailroom_need_count(sdata
);
514 ieee80211_key_replace(sdata
, sta
, pairwise
, old_key
, key
);
515 ieee80211_key_destroy(old_key
, true);
517 ieee80211_debugfs_key_add(key
);
519 if (!local
->wowlan
) {
520 ret
= ieee80211_key_enable_hw_accel(key
);
522 ieee80211_key_free(key
, true);
527 mutex_unlock(&sdata
->local
->key_mtx
);
532 void ieee80211_key_free(struct ieee80211_key
*key
, bool delay_tailroom
)
538 * Replace key with nothingness if it was ever used.
541 ieee80211_key_replace(key
->sdata
, key
->sta
,
542 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
544 ieee80211_key_destroy(key
, delay_tailroom
);
547 void ieee80211_enable_keys(struct ieee80211_sub_if_data
*sdata
)
549 struct ieee80211_key
*key
;
553 if (WARN_ON(!ieee80211_sdata_running(sdata
)))
556 mutex_lock(&sdata
->local
->key_mtx
);
558 sdata
->crypto_tx_tailroom_needed_cnt
= 0;
560 list_for_each_entry(key
, &sdata
->key_list
, list
) {
561 increment_tailroom_need_count(sdata
);
562 ieee80211_key_enable_hw_accel(key
);
565 mutex_unlock(&sdata
->local
->key_mtx
);
568 void ieee80211_iter_keys(struct ieee80211_hw
*hw
,
569 struct ieee80211_vif
*vif
,
570 void (*iter
)(struct ieee80211_hw
*hw
,
571 struct ieee80211_vif
*vif
,
572 struct ieee80211_sta
*sta
,
573 struct ieee80211_key_conf
*key
,
577 struct ieee80211_local
*local
= hw_to_local(hw
);
578 struct ieee80211_key
*key
, *tmp
;
579 struct ieee80211_sub_if_data
*sdata
;
583 mutex_lock(&local
->key_mtx
);
585 sdata
= vif_to_sdata(vif
);
586 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
)
587 iter(hw
, &sdata
->vif
,
588 key
->sta
? &key
->sta
->sta
: NULL
,
589 &key
->conf
, iter_data
);
591 list_for_each_entry(sdata
, &local
->interfaces
, list
)
592 list_for_each_entry_safe(key
, tmp
,
593 &sdata
->key_list
, list
)
594 iter(hw
, &sdata
->vif
,
595 key
->sta
? &key
->sta
->sta
: NULL
,
596 &key
->conf
, iter_data
);
598 mutex_unlock(&local
->key_mtx
);
600 EXPORT_SYMBOL(ieee80211_iter_keys
);
602 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data
*sdata
,
603 struct list_head
*keys
)
605 struct ieee80211_key
*key
, *tmp
;
607 sdata
->crypto_tx_tailroom_needed_cnt
-=
608 sdata
->crypto_tx_tailroom_pending_dec
;
609 sdata
->crypto_tx_tailroom_pending_dec
= 0;
611 ieee80211_debugfs_key_remove_mgmt_default(sdata
);
613 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
) {
614 ieee80211_key_replace(key
->sdata
, key
->sta
,
615 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
617 list_add_tail(&key
->list
, keys
);
620 ieee80211_debugfs_key_update_default(sdata
);
623 void ieee80211_free_keys(struct ieee80211_sub_if_data
*sdata
,
624 bool force_synchronize
)
626 struct ieee80211_local
*local
= sdata
->local
;
627 struct ieee80211_sub_if_data
*vlan
;
628 struct ieee80211_key
*key
, *tmp
;
631 cancel_delayed_work_sync(&sdata
->dec_tailroom_needed_wk
);
633 mutex_lock(&local
->key_mtx
);
635 ieee80211_free_keys_iface(sdata
, &keys
);
637 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
638 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
639 ieee80211_free_keys_iface(vlan
, &keys
);
642 if (!list_empty(&keys
) || force_synchronize
)
644 list_for_each_entry_safe(key
, tmp
, &keys
, list
)
645 __ieee80211_key_destroy(key
, false);
647 WARN_ON_ONCE(sdata
->crypto_tx_tailroom_needed_cnt
||
648 sdata
->crypto_tx_tailroom_pending_dec
);
649 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
650 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
651 WARN_ON_ONCE(vlan
->crypto_tx_tailroom_needed_cnt
||
652 vlan
->crypto_tx_tailroom_pending_dec
);
655 mutex_unlock(&local
->key_mtx
);
658 void ieee80211_free_sta_keys(struct ieee80211_local
*local
,
659 struct sta_info
*sta
)
661 struct ieee80211_key
*key
;
664 mutex_lock(&local
->key_mtx
);
665 for (i
= 0; i
< ARRAY_SIZE(sta
->gtk
); i
++) {
666 key
= key_mtx_dereference(local
, sta
->gtk
[i
]);
669 ieee80211_key_replace(key
->sdata
, key
->sta
,
670 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
672 __ieee80211_key_destroy(key
, true);
675 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
676 key
= key_mtx_dereference(local
, sta
->ptk
[i
]);
679 ieee80211_key_replace(key
->sdata
, key
->sta
,
680 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
682 __ieee80211_key_destroy(key
, true);
685 mutex_unlock(&local
->key_mtx
);
688 void ieee80211_delayed_tailroom_dec(struct work_struct
*wk
)
690 struct ieee80211_sub_if_data
*sdata
;
692 sdata
= container_of(wk
, struct ieee80211_sub_if_data
,
693 dec_tailroom_needed_wk
.work
);
696 * The reason for the delayed tailroom needed decrementing is to
697 * make roaming faster: during roaming, all keys are first deleted
698 * and then new keys are installed. The first new key causes the
699 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
700 * the cost of synchronize_net() (which can be slow). Avoid this
701 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
702 * key removal for a while, so if we roam the value is larger than
703 * zero and no 0->1 transition happens.
705 * The cost is that if the AP switching was from an AP with keys
706 * to one without, we still allocate tailroom while it would no
707 * longer be needed. However, in the typical (fast) roaming case
708 * within an ESS this usually won't happen.
711 mutex_lock(&sdata
->local
->key_mtx
);
712 sdata
->crypto_tx_tailroom_needed_cnt
-=
713 sdata
->crypto_tx_tailroom_pending_dec
;
714 sdata
->crypto_tx_tailroom_pending_dec
= 0;
715 mutex_unlock(&sdata
->local
->key_mtx
);
718 void ieee80211_gtk_rekey_notify(struct ieee80211_vif
*vif
, const u8
*bssid
,
719 const u8
*replay_ctr
, gfp_t gfp
)
721 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
723 trace_api_gtk_rekey_notify(sdata
, bssid
, replay_ctr
);
725 cfg80211_gtk_rekey_notify(sdata
->dev
, bssid
, replay_ctr
, gfp
);
727 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify
);
729 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
730 struct ieee80211_key_seq
*seq
)
732 struct ieee80211_key
*key
;
735 if (WARN_ON(!(keyconf
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
)))
738 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
740 switch (key
->conf
.cipher
) {
741 case WLAN_CIPHER_SUITE_TKIP
:
742 seq
->tkip
.iv32
= key
->u
.tkip
.tx
.iv32
;
743 seq
->tkip
.iv16
= key
->u
.tkip
.tx
.iv16
;
745 case WLAN_CIPHER_SUITE_CCMP
:
746 pn64
= atomic64_read(&key
->u
.ccmp
.tx_pn
);
747 seq
->ccmp
.pn
[5] = pn64
;
748 seq
->ccmp
.pn
[4] = pn64
>> 8;
749 seq
->ccmp
.pn
[3] = pn64
>> 16;
750 seq
->ccmp
.pn
[2] = pn64
>> 24;
751 seq
->ccmp
.pn
[1] = pn64
>> 32;
752 seq
->ccmp
.pn
[0] = pn64
>> 40;
754 case WLAN_CIPHER_SUITE_AES_CMAC
:
755 pn64
= atomic64_read(&key
->u
.aes_cmac
.tx_pn
);
756 seq
->ccmp
.pn
[5] = pn64
;
757 seq
->ccmp
.pn
[4] = pn64
>> 8;
758 seq
->ccmp
.pn
[3] = pn64
>> 16;
759 seq
->ccmp
.pn
[2] = pn64
>> 24;
760 seq
->ccmp
.pn
[1] = pn64
>> 32;
761 seq
->ccmp
.pn
[0] = pn64
>> 40;
767 EXPORT_SYMBOL(ieee80211_get_key_tx_seq
);
769 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
770 int tid
, struct ieee80211_key_seq
*seq
)
772 struct ieee80211_key
*key
;
775 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
777 switch (key
->conf
.cipher
) {
778 case WLAN_CIPHER_SUITE_TKIP
:
779 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
781 seq
->tkip
.iv32
= key
->u
.tkip
.rx
[tid
].iv32
;
782 seq
->tkip
.iv16
= key
->u
.tkip
.rx
[tid
].iv16
;
784 case WLAN_CIPHER_SUITE_CCMP
:
785 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
788 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
790 pn
= key
->u
.ccmp
.rx_pn
[tid
];
791 memcpy(seq
->ccmp
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
793 case WLAN_CIPHER_SUITE_AES_CMAC
:
794 if (WARN_ON(tid
!= 0))
796 pn
= key
->u
.aes_cmac
.rx_pn
;
797 memcpy(seq
->aes_cmac
.pn
, pn
, IEEE80211_CMAC_PN_LEN
);
801 EXPORT_SYMBOL(ieee80211_get_key_rx_seq
);
803 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
804 struct ieee80211_key_seq
*seq
)
806 struct ieee80211_key
*key
;
809 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
811 switch (key
->conf
.cipher
) {
812 case WLAN_CIPHER_SUITE_TKIP
:
813 key
->u
.tkip
.tx
.iv32
= seq
->tkip
.iv32
;
814 key
->u
.tkip
.tx
.iv16
= seq
->tkip
.iv16
;
816 case WLAN_CIPHER_SUITE_CCMP
:
817 pn64
= (u64
)seq
->ccmp
.pn
[5] |
818 ((u64
)seq
->ccmp
.pn
[4] << 8) |
819 ((u64
)seq
->ccmp
.pn
[3] << 16) |
820 ((u64
)seq
->ccmp
.pn
[2] << 24) |
821 ((u64
)seq
->ccmp
.pn
[1] << 32) |
822 ((u64
)seq
->ccmp
.pn
[0] << 40);
823 atomic64_set(&key
->u
.ccmp
.tx_pn
, pn64
);
825 case WLAN_CIPHER_SUITE_AES_CMAC
:
826 pn64
= (u64
)seq
->aes_cmac
.pn
[5] |
827 ((u64
)seq
->aes_cmac
.pn
[4] << 8) |
828 ((u64
)seq
->aes_cmac
.pn
[3] << 16) |
829 ((u64
)seq
->aes_cmac
.pn
[2] << 24) |
830 ((u64
)seq
->aes_cmac
.pn
[1] << 32) |
831 ((u64
)seq
->aes_cmac
.pn
[0] << 40);
832 atomic64_set(&key
->u
.aes_cmac
.tx_pn
, pn64
);
839 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq
);
841 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
842 int tid
, struct ieee80211_key_seq
*seq
)
844 struct ieee80211_key
*key
;
847 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
849 switch (key
->conf
.cipher
) {
850 case WLAN_CIPHER_SUITE_TKIP
:
851 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
853 key
->u
.tkip
.rx
[tid
].iv32
= seq
->tkip
.iv32
;
854 key
->u
.tkip
.rx
[tid
].iv16
= seq
->tkip
.iv16
;
856 case WLAN_CIPHER_SUITE_CCMP
:
857 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
860 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
862 pn
= key
->u
.ccmp
.rx_pn
[tid
];
863 memcpy(pn
, seq
->ccmp
.pn
, IEEE80211_CCMP_PN_LEN
);
865 case WLAN_CIPHER_SUITE_AES_CMAC
:
866 if (WARN_ON(tid
!= 0))
868 pn
= key
->u
.aes_cmac
.rx_pn
;
869 memcpy(pn
, seq
->aes_cmac
.pn
, IEEE80211_CMAC_PN_LEN
);
876 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq
);
878 void ieee80211_remove_key(struct ieee80211_key_conf
*keyconf
)
880 struct ieee80211_key
*key
;
882 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
884 assert_key_lock(key
->local
);
887 * if key was uploaded, we assume the driver will/has remove(d)
888 * it, so adjust bookkeeping accordingly
890 if (key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
) {
891 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
893 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
894 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
895 increment_tailroom_need_count(key
->sdata
);
898 ieee80211_key_free(key
, false);
900 EXPORT_SYMBOL_GPL(ieee80211_remove_key
);
902 struct ieee80211_key_conf
*
903 ieee80211_gtk_rekey_add(struct ieee80211_vif
*vif
,
904 struct ieee80211_key_conf
*keyconf
)
906 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
907 struct ieee80211_local
*local
= sdata
->local
;
908 struct ieee80211_key
*key
;
911 if (WARN_ON(!local
->wowlan
))
912 return ERR_PTR(-EINVAL
);
914 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
915 return ERR_PTR(-EINVAL
);
917 key
= ieee80211_key_alloc(keyconf
->cipher
, keyconf
->keyidx
,
918 keyconf
->keylen
, keyconf
->key
,
921 return ERR_CAST(key
);
923 if (sdata
->u
.mgd
.mfp
!= IEEE80211_MFP_DISABLED
)
924 key
->conf
.flags
|= IEEE80211_KEY_FLAG_RX_MGMT
;
926 err
= ieee80211_key_link(key
, sdata
, NULL
);
932 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add
);