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
;
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
)
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 */
173 static void ieee80211_key_disable_hw_accel(struct ieee80211_key
*key
)
175 struct ieee80211_sub_if_data
*sdata
;
176 struct sta_info
*sta
;
181 if (!key
|| !key
->local
->ops
->set_key
)
184 assert_key_lock(key
->local
);
186 if (!(key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
192 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
193 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
194 increment_tailroom_need_count(sdata
);
196 ret
= drv_set_key(key
->local
, DISABLE_KEY
, sdata
,
197 sta
? &sta
->sta
: NULL
, &key
->conf
);
201 "failed to remove key (%d, %pM) from hardware (%d)\n",
203 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
205 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
208 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
,
209 int idx
, bool uni
, bool multi
)
211 struct ieee80211_key
*key
= NULL
;
213 assert_key_lock(sdata
->local
);
215 if (idx
>= 0 && idx
< NUM_DEFAULT_KEYS
)
216 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
219 rcu_assign_pointer(sdata
->default_unicast_key
, key
);
220 drv_set_default_unicast_key(sdata
->local
, sdata
, idx
);
224 rcu_assign_pointer(sdata
->default_multicast_key
, key
);
226 ieee80211_debugfs_key_update_default(sdata
);
229 void ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
, int idx
,
230 bool uni
, bool multi
)
232 mutex_lock(&sdata
->local
->key_mtx
);
233 __ieee80211_set_default_key(sdata
, idx
, uni
, multi
);
234 mutex_unlock(&sdata
->local
->key_mtx
);
238 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
, int idx
)
240 struct ieee80211_key
*key
= NULL
;
242 assert_key_lock(sdata
->local
);
244 if (idx
>= NUM_DEFAULT_KEYS
&&
245 idx
< NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
246 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
248 rcu_assign_pointer(sdata
->default_mgmt_key
, key
);
250 ieee80211_debugfs_key_update_default(sdata
);
253 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
,
256 mutex_lock(&sdata
->local
->key_mtx
);
257 __ieee80211_set_default_mgmt_key(sdata
, idx
);
258 mutex_unlock(&sdata
->local
->key_mtx
);
262 static void ieee80211_key_replace(struct ieee80211_sub_if_data
*sdata
,
263 struct sta_info
*sta
,
265 struct ieee80211_key
*old
,
266 struct ieee80211_key
*new)
269 bool defunikey
, defmultikey
, defmgmtkey
;
271 /* caller must provide at least one old/new */
272 if (WARN_ON(!new && !old
))
276 list_add_tail(&new->list
, &sdata
->key_list
);
278 WARN_ON(new && old
&& new->conf
.keyidx
!= old
->conf
.keyidx
);
281 idx
= old
->conf
.keyidx
;
283 idx
= new->conf
.keyidx
;
287 rcu_assign_pointer(sta
->ptk
[idx
], new);
290 rcu_assign_pointer(sta
->gtk
[idx
], new);
295 old
== key_mtx_dereference(sdata
->local
,
296 sdata
->default_unicast_key
);
298 old
== key_mtx_dereference(sdata
->local
,
299 sdata
->default_multicast_key
);
301 old
== key_mtx_dereference(sdata
->local
,
302 sdata
->default_mgmt_key
);
304 if (defunikey
&& !new)
305 __ieee80211_set_default_key(sdata
, -1, true, false);
306 if (defmultikey
&& !new)
307 __ieee80211_set_default_key(sdata
, -1, false, true);
308 if (defmgmtkey
&& !new)
309 __ieee80211_set_default_mgmt_key(sdata
, -1);
311 rcu_assign_pointer(sdata
->keys
[idx
], new);
312 if (defunikey
&& new)
313 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
315 if (defmultikey
&& new)
316 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
318 if (defmgmtkey
&& new)
319 __ieee80211_set_default_mgmt_key(sdata
,
324 list_del(&old
->list
);
327 struct ieee80211_key
*
328 ieee80211_key_alloc(u32 cipher
, int idx
, size_t key_len
,
330 size_t seq_len
, const u8
*seq
,
331 const struct ieee80211_cipher_scheme
*cs
)
333 struct ieee80211_key
*key
;
336 if (WARN_ON(idx
< 0 || idx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
))
337 return ERR_PTR(-EINVAL
);
339 key
= kzalloc(sizeof(struct ieee80211_key
) + key_len
, GFP_KERNEL
);
341 return ERR_PTR(-ENOMEM
);
344 * Default to software encryption; we'll later upload the
345 * key to the hardware if possible.
350 key
->conf
.cipher
= cipher
;
351 key
->conf
.keyidx
= idx
;
352 key
->conf
.keylen
= key_len
;
354 case WLAN_CIPHER_SUITE_WEP40
:
355 case WLAN_CIPHER_SUITE_WEP104
:
356 key
->conf
.iv_len
= IEEE80211_WEP_IV_LEN
;
357 key
->conf
.icv_len
= IEEE80211_WEP_ICV_LEN
;
359 case WLAN_CIPHER_SUITE_TKIP
:
360 key
->conf
.iv_len
= IEEE80211_TKIP_IV_LEN
;
361 key
->conf
.icv_len
= IEEE80211_TKIP_ICV_LEN
;
363 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
364 key
->u
.tkip
.rx
[i
].iv32
=
365 get_unaligned_le32(&seq
[2]);
366 key
->u
.tkip
.rx
[i
].iv16
=
367 get_unaligned_le16(seq
);
370 spin_lock_init(&key
->u
.tkip
.txlock
);
372 case WLAN_CIPHER_SUITE_CCMP
:
373 key
->conf
.iv_len
= IEEE80211_CCMP_HDR_LEN
;
374 key
->conf
.icv_len
= IEEE80211_CCMP_MIC_LEN
;
376 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
377 for (j
= 0; j
< IEEE80211_CCMP_PN_LEN
; j
++)
378 key
->u
.ccmp
.rx_pn
[i
][j
] =
379 seq
[IEEE80211_CCMP_PN_LEN
- j
- 1];
382 * Initialize AES key state here as an optimization so that
383 * it does not need to be initialized for every packet.
385 key
->u
.ccmp
.tfm
= ieee80211_aes_key_setup_encrypt(key_data
);
386 if (IS_ERR(key
->u
.ccmp
.tfm
)) {
387 err
= PTR_ERR(key
->u
.ccmp
.tfm
);
392 case WLAN_CIPHER_SUITE_AES_CMAC
:
393 key
->conf
.iv_len
= 0;
394 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie
);
396 for (j
= 0; j
< IEEE80211_CMAC_PN_LEN
; j
++)
397 key
->u
.aes_cmac
.rx_pn
[j
] =
398 seq
[IEEE80211_CMAC_PN_LEN
- j
- 1];
400 * Initialize AES key state here as an optimization so that
401 * it does not need to be initialized for every packet.
403 key
->u
.aes_cmac
.tfm
=
404 ieee80211_aes_cmac_key_setup(key_data
);
405 if (IS_ERR(key
->u
.aes_cmac
.tfm
)) {
406 err
= PTR_ERR(key
->u
.aes_cmac
.tfm
);
413 size_t len
= (seq_len
> MAX_PN_LEN
) ?
414 MAX_PN_LEN
: seq_len
;
416 key
->conf
.iv_len
= cs
->hdr_len
;
417 key
->conf
.icv_len
= cs
->mic_len
;
418 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
419 for (j
= 0; j
< len
; j
++)
420 key
->u
.gen
.rx_pn
[i
][j
] =
424 memcpy(key
->conf
.key
, key_data
, key_len
);
425 INIT_LIST_HEAD(&key
->list
);
430 static void ieee80211_key_free_common(struct ieee80211_key
*key
)
432 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
)
433 ieee80211_aes_key_free(key
->u
.ccmp
.tfm
);
434 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_AES_CMAC
)
435 ieee80211_aes_cmac_key_free(key
->u
.aes_cmac
.tfm
);
439 static void __ieee80211_key_destroy(struct ieee80211_key
*key
,
443 ieee80211_key_disable_hw_accel(key
);
446 struct ieee80211_sub_if_data
*sdata
= key
->sdata
;
448 ieee80211_debugfs_key_remove(key
);
450 if (delay_tailroom
) {
451 /* see ieee80211_delayed_tailroom_dec */
452 sdata
->crypto_tx_tailroom_pending_dec
++;
453 schedule_delayed_work(&sdata
->dec_tailroom_needed_wk
,
456 sdata
->crypto_tx_tailroom_needed_cnt
--;
460 ieee80211_key_free_common(key
);
463 static void ieee80211_key_destroy(struct ieee80211_key
*key
,
470 * Synchronize so the TX path can no longer be using
471 * this key before we free/remove it.
475 __ieee80211_key_destroy(key
, delay_tailroom
);
478 void ieee80211_key_free_unused(struct ieee80211_key
*key
)
480 WARN_ON(key
->sdata
|| key
->local
);
481 ieee80211_key_free_common(key
);
484 int ieee80211_key_link(struct ieee80211_key
*key
,
485 struct ieee80211_sub_if_data
*sdata
,
486 struct sta_info
*sta
)
488 struct ieee80211_local
*local
= sdata
->local
;
489 struct ieee80211_key
*old_key
;
493 pairwise
= key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
;
494 idx
= key
->conf
.keyidx
;
495 key
->local
= sdata
->local
;
499 mutex_lock(&sdata
->local
->key_mtx
);
502 old_key
= key_mtx_dereference(sdata
->local
, sta
->ptk
[idx
]);
504 old_key
= key_mtx_dereference(sdata
->local
, sta
->gtk
[idx
]);
506 old_key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
508 increment_tailroom_need_count(sdata
);
510 ieee80211_key_replace(sdata
, sta
, pairwise
, old_key
, key
);
511 ieee80211_key_destroy(old_key
, true);
513 ieee80211_debugfs_key_add(key
);
515 if (!local
->wowlan
) {
516 ret
= ieee80211_key_enable_hw_accel(key
);
518 ieee80211_key_free(key
, true);
523 mutex_unlock(&sdata
->local
->key_mtx
);
528 void ieee80211_key_free(struct ieee80211_key
*key
, bool delay_tailroom
)
534 * Replace key with nothingness if it was ever used.
537 ieee80211_key_replace(key
->sdata
, key
->sta
,
538 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
540 ieee80211_key_destroy(key
, delay_tailroom
);
543 void ieee80211_enable_keys(struct ieee80211_sub_if_data
*sdata
)
545 struct ieee80211_key
*key
;
549 if (WARN_ON(!ieee80211_sdata_running(sdata
)))
552 mutex_lock(&sdata
->local
->key_mtx
);
554 sdata
->crypto_tx_tailroom_needed_cnt
= 0;
556 list_for_each_entry(key
, &sdata
->key_list
, list
) {
557 increment_tailroom_need_count(sdata
);
558 ieee80211_key_enable_hw_accel(key
);
561 mutex_unlock(&sdata
->local
->key_mtx
);
564 void ieee80211_iter_keys(struct ieee80211_hw
*hw
,
565 struct ieee80211_vif
*vif
,
566 void (*iter
)(struct ieee80211_hw
*hw
,
567 struct ieee80211_vif
*vif
,
568 struct ieee80211_sta
*sta
,
569 struct ieee80211_key_conf
*key
,
573 struct ieee80211_local
*local
= hw_to_local(hw
);
574 struct ieee80211_key
*key
, *tmp
;
575 struct ieee80211_sub_if_data
*sdata
;
579 mutex_lock(&local
->key_mtx
);
581 sdata
= vif_to_sdata(vif
);
582 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
)
583 iter(hw
, &sdata
->vif
,
584 key
->sta
? &key
->sta
->sta
: NULL
,
585 &key
->conf
, iter_data
);
587 list_for_each_entry(sdata
, &local
->interfaces
, list
)
588 list_for_each_entry_safe(key
, tmp
,
589 &sdata
->key_list
, list
)
590 iter(hw
, &sdata
->vif
,
591 key
->sta
? &key
->sta
->sta
: NULL
,
592 &key
->conf
, iter_data
);
594 mutex_unlock(&local
->key_mtx
);
596 EXPORT_SYMBOL(ieee80211_iter_keys
);
598 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data
*sdata
,
599 struct list_head
*keys
)
601 struct ieee80211_key
*key
, *tmp
;
603 sdata
->crypto_tx_tailroom_needed_cnt
-=
604 sdata
->crypto_tx_tailroom_pending_dec
;
605 sdata
->crypto_tx_tailroom_pending_dec
= 0;
607 ieee80211_debugfs_key_remove_mgmt_default(sdata
);
609 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
) {
610 ieee80211_key_replace(key
->sdata
, key
->sta
,
611 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
613 list_add_tail(&key
->list
, keys
);
616 ieee80211_debugfs_key_update_default(sdata
);
619 void ieee80211_free_keys(struct ieee80211_sub_if_data
*sdata
,
620 bool force_synchronize
)
622 struct ieee80211_local
*local
= sdata
->local
;
623 struct ieee80211_sub_if_data
*vlan
;
624 struct ieee80211_key
*key
, *tmp
;
627 cancel_delayed_work_sync(&sdata
->dec_tailroom_needed_wk
);
629 mutex_lock(&local
->key_mtx
);
631 ieee80211_free_keys_iface(sdata
, &keys
);
633 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
634 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
635 ieee80211_free_keys_iface(vlan
, &keys
);
638 if (!list_empty(&keys
) || force_synchronize
)
640 list_for_each_entry_safe(key
, tmp
, &keys
, list
)
641 __ieee80211_key_destroy(key
, false);
643 WARN_ON_ONCE(sdata
->crypto_tx_tailroom_needed_cnt
||
644 sdata
->crypto_tx_tailroom_pending_dec
);
645 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
646 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
647 WARN_ON_ONCE(vlan
->crypto_tx_tailroom_needed_cnt
||
648 vlan
->crypto_tx_tailroom_pending_dec
);
651 mutex_unlock(&local
->key_mtx
);
654 void ieee80211_free_sta_keys(struct ieee80211_local
*local
,
655 struct sta_info
*sta
)
657 struct ieee80211_key
*key
;
660 mutex_lock(&local
->key_mtx
);
661 for (i
= 0; i
< ARRAY_SIZE(sta
->gtk
); i
++) {
662 key
= key_mtx_dereference(local
, sta
->gtk
[i
]);
665 ieee80211_key_replace(key
->sdata
, key
->sta
,
666 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
668 __ieee80211_key_destroy(key
, true);
671 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
672 key
= key_mtx_dereference(local
, sta
->ptk
[i
]);
675 ieee80211_key_replace(key
->sdata
, key
->sta
,
676 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
678 __ieee80211_key_destroy(key
, true);
681 mutex_unlock(&local
->key_mtx
);
684 void ieee80211_delayed_tailroom_dec(struct work_struct
*wk
)
686 struct ieee80211_sub_if_data
*sdata
;
688 sdata
= container_of(wk
, struct ieee80211_sub_if_data
,
689 dec_tailroom_needed_wk
.work
);
692 * The reason for the delayed tailroom needed decrementing is to
693 * make roaming faster: during roaming, all keys are first deleted
694 * and then new keys are installed. The first new key causes the
695 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
696 * the cost of synchronize_net() (which can be slow). Avoid this
697 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
698 * key removal for a while, so if we roam the value is larger than
699 * zero and no 0->1 transition happens.
701 * The cost is that if the AP switching was from an AP with keys
702 * to one without, we still allocate tailroom while it would no
703 * longer be needed. However, in the typical (fast) roaming case
704 * within an ESS this usually won't happen.
707 mutex_lock(&sdata
->local
->key_mtx
);
708 sdata
->crypto_tx_tailroom_needed_cnt
-=
709 sdata
->crypto_tx_tailroom_pending_dec
;
710 sdata
->crypto_tx_tailroom_pending_dec
= 0;
711 mutex_unlock(&sdata
->local
->key_mtx
);
714 void ieee80211_gtk_rekey_notify(struct ieee80211_vif
*vif
, const u8
*bssid
,
715 const u8
*replay_ctr
, gfp_t gfp
)
717 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
719 trace_api_gtk_rekey_notify(sdata
, bssid
, replay_ctr
);
721 cfg80211_gtk_rekey_notify(sdata
->dev
, bssid
, replay_ctr
, gfp
);
723 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify
);
725 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
726 struct ieee80211_key_seq
*seq
)
728 struct ieee80211_key
*key
;
731 if (WARN_ON(!(keyconf
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
)))
734 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
736 switch (key
->conf
.cipher
) {
737 case WLAN_CIPHER_SUITE_TKIP
:
738 seq
->tkip
.iv32
= key
->u
.tkip
.tx
.iv32
;
739 seq
->tkip
.iv16
= key
->u
.tkip
.tx
.iv16
;
741 case WLAN_CIPHER_SUITE_CCMP
:
742 pn64
= atomic64_read(&key
->u
.ccmp
.tx_pn
);
743 seq
->ccmp
.pn
[5] = pn64
;
744 seq
->ccmp
.pn
[4] = pn64
>> 8;
745 seq
->ccmp
.pn
[3] = pn64
>> 16;
746 seq
->ccmp
.pn
[2] = pn64
>> 24;
747 seq
->ccmp
.pn
[1] = pn64
>> 32;
748 seq
->ccmp
.pn
[0] = pn64
>> 40;
750 case WLAN_CIPHER_SUITE_AES_CMAC
:
751 pn64
= atomic64_read(&key
->u
.aes_cmac
.tx_pn
);
752 seq
->ccmp
.pn
[5] = pn64
;
753 seq
->ccmp
.pn
[4] = pn64
>> 8;
754 seq
->ccmp
.pn
[3] = pn64
>> 16;
755 seq
->ccmp
.pn
[2] = pn64
>> 24;
756 seq
->ccmp
.pn
[1] = pn64
>> 32;
757 seq
->ccmp
.pn
[0] = pn64
>> 40;
763 EXPORT_SYMBOL(ieee80211_get_key_tx_seq
);
765 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
766 int tid
, struct ieee80211_key_seq
*seq
)
768 struct ieee80211_key
*key
;
771 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
773 switch (key
->conf
.cipher
) {
774 case WLAN_CIPHER_SUITE_TKIP
:
775 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
777 seq
->tkip
.iv32
= key
->u
.tkip
.rx
[tid
].iv32
;
778 seq
->tkip
.iv16
= key
->u
.tkip
.rx
[tid
].iv16
;
780 case WLAN_CIPHER_SUITE_CCMP
:
781 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
784 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
786 pn
= key
->u
.ccmp
.rx_pn
[tid
];
787 memcpy(seq
->ccmp
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
789 case WLAN_CIPHER_SUITE_AES_CMAC
:
790 if (WARN_ON(tid
!= 0))
792 pn
= key
->u
.aes_cmac
.rx_pn
;
793 memcpy(seq
->aes_cmac
.pn
, pn
, IEEE80211_CMAC_PN_LEN
);
797 EXPORT_SYMBOL(ieee80211_get_key_rx_seq
);
799 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
800 struct ieee80211_key_seq
*seq
)
802 struct ieee80211_key
*key
;
805 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
807 switch (key
->conf
.cipher
) {
808 case WLAN_CIPHER_SUITE_TKIP
:
809 key
->u
.tkip
.tx
.iv32
= seq
->tkip
.iv32
;
810 key
->u
.tkip
.tx
.iv16
= seq
->tkip
.iv16
;
812 case WLAN_CIPHER_SUITE_CCMP
:
813 pn64
= (u64
)seq
->ccmp
.pn
[5] |
814 ((u64
)seq
->ccmp
.pn
[4] << 8) |
815 ((u64
)seq
->ccmp
.pn
[3] << 16) |
816 ((u64
)seq
->ccmp
.pn
[2] << 24) |
817 ((u64
)seq
->ccmp
.pn
[1] << 32) |
818 ((u64
)seq
->ccmp
.pn
[0] << 40);
819 atomic64_set(&key
->u
.ccmp
.tx_pn
, pn64
);
821 case WLAN_CIPHER_SUITE_AES_CMAC
:
822 pn64
= (u64
)seq
->aes_cmac
.pn
[5] |
823 ((u64
)seq
->aes_cmac
.pn
[4] << 8) |
824 ((u64
)seq
->aes_cmac
.pn
[3] << 16) |
825 ((u64
)seq
->aes_cmac
.pn
[2] << 24) |
826 ((u64
)seq
->aes_cmac
.pn
[1] << 32) |
827 ((u64
)seq
->aes_cmac
.pn
[0] << 40);
828 atomic64_set(&key
->u
.aes_cmac
.tx_pn
, pn64
);
835 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq
);
837 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
838 int tid
, struct ieee80211_key_seq
*seq
)
840 struct ieee80211_key
*key
;
843 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
845 switch (key
->conf
.cipher
) {
846 case WLAN_CIPHER_SUITE_TKIP
:
847 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
849 key
->u
.tkip
.rx
[tid
].iv32
= seq
->tkip
.iv32
;
850 key
->u
.tkip
.rx
[tid
].iv16
= seq
->tkip
.iv16
;
852 case WLAN_CIPHER_SUITE_CCMP
:
853 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
856 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
858 pn
= key
->u
.ccmp
.rx_pn
[tid
];
859 memcpy(pn
, seq
->ccmp
.pn
, IEEE80211_CCMP_PN_LEN
);
861 case WLAN_CIPHER_SUITE_AES_CMAC
:
862 if (WARN_ON(tid
!= 0))
864 pn
= key
->u
.aes_cmac
.rx_pn
;
865 memcpy(pn
, seq
->aes_cmac
.pn
, IEEE80211_CMAC_PN_LEN
);
872 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq
);
874 void ieee80211_remove_key(struct ieee80211_key_conf
*keyconf
)
876 struct ieee80211_key
*key
;
878 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
880 assert_key_lock(key
->local
);
883 * if key was uploaded, we assume the driver will/has remove(d)
884 * it, so adjust bookkeeping accordingly
886 if (key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
) {
887 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
889 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
890 (key
->conf
.flags
& IEEE80211_KEY_FLAG_RESERVE_TAILROOM
)))
891 increment_tailroom_need_count(key
->sdata
);
894 ieee80211_key_free(key
, false);
896 EXPORT_SYMBOL_GPL(ieee80211_remove_key
);
898 struct ieee80211_key_conf
*
899 ieee80211_gtk_rekey_add(struct ieee80211_vif
*vif
,
900 struct ieee80211_key_conf
*keyconf
)
902 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
903 struct ieee80211_local
*local
= sdata
->local
;
904 struct ieee80211_key
*key
;
907 if (WARN_ON(!local
->wowlan
))
908 return ERR_PTR(-EINVAL
);
910 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
911 return ERR_PTR(-EINVAL
);
913 key
= ieee80211_key_alloc(keyconf
->cipher
, keyconf
->keyidx
,
914 keyconf
->keylen
, keyconf
->key
,
917 return ERR_CAST(key
);
919 if (sdata
->u
.mgd
.mfp
!= IEEE80211_MFP_DISABLED
)
920 key
->conf
.flags
|= IEEE80211_KEY_FLAG_RX_MGMT
;
922 err
= ieee80211_key_link(key
, sdata
, NULL
);
928 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add
);