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_GENERATE_IV
) ||
145 (key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
)))
146 sdata
->crypto_tx_tailroom_needed_cnt
--;
148 WARN_ON((key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
) &&
149 (key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
));
154 if (ret
!= -ENOSPC
&& ret
!= -EOPNOTSUPP
)
156 "failed to set key (%d, %pM) to hardware (%d)\n",
158 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
161 switch (key
->conf
.cipher
) {
162 case WLAN_CIPHER_SUITE_WEP40
:
163 case WLAN_CIPHER_SUITE_WEP104
:
164 case WLAN_CIPHER_SUITE_TKIP
:
165 case WLAN_CIPHER_SUITE_CCMP
:
166 case WLAN_CIPHER_SUITE_AES_CMAC
:
167 /* all of these we can do in software */
174 static void ieee80211_key_disable_hw_accel(struct ieee80211_key
*key
)
176 struct ieee80211_sub_if_data
*sdata
;
177 struct sta_info
*sta
;
182 if (!key
|| !key
->local
->ops
->set_key
)
185 assert_key_lock(key
->local
);
187 if (!(key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
))
193 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
194 (key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) ||
195 (key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
)))
196 increment_tailroom_need_count(sdata
);
198 ret
= drv_set_key(key
->local
, DISABLE_KEY
, sdata
,
199 sta
? &sta
->sta
: NULL
, &key
->conf
);
203 "failed to remove key (%d, %pM) from hardware (%d)\n",
205 sta
? sta
->sta
.addr
: bcast_addr
, ret
);
207 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
210 static void __ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
,
211 int idx
, bool uni
, bool multi
)
213 struct ieee80211_key
*key
= NULL
;
215 assert_key_lock(sdata
->local
);
217 if (idx
>= 0 && idx
< NUM_DEFAULT_KEYS
)
218 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
221 rcu_assign_pointer(sdata
->default_unicast_key
, key
);
222 drv_set_default_unicast_key(sdata
->local
, sdata
, idx
);
226 rcu_assign_pointer(sdata
->default_multicast_key
, key
);
228 ieee80211_debugfs_key_update_default(sdata
);
231 void ieee80211_set_default_key(struct ieee80211_sub_if_data
*sdata
, int idx
,
232 bool uni
, bool multi
)
234 mutex_lock(&sdata
->local
->key_mtx
);
235 __ieee80211_set_default_key(sdata
, idx
, uni
, multi
);
236 mutex_unlock(&sdata
->local
->key_mtx
);
240 __ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
, int idx
)
242 struct ieee80211_key
*key
= NULL
;
244 assert_key_lock(sdata
->local
);
246 if (idx
>= NUM_DEFAULT_KEYS
&&
247 idx
< NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
)
248 key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
250 rcu_assign_pointer(sdata
->default_mgmt_key
, key
);
252 ieee80211_debugfs_key_update_default(sdata
);
255 void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data
*sdata
,
258 mutex_lock(&sdata
->local
->key_mtx
);
259 __ieee80211_set_default_mgmt_key(sdata
, idx
);
260 mutex_unlock(&sdata
->local
->key_mtx
);
264 static void ieee80211_key_replace(struct ieee80211_sub_if_data
*sdata
,
265 struct sta_info
*sta
,
267 struct ieee80211_key
*old
,
268 struct ieee80211_key
*new)
271 bool defunikey
, defmultikey
, defmgmtkey
;
273 /* caller must provide at least one old/new */
274 if (WARN_ON(!new && !old
))
278 list_add_tail(&new->list
, &sdata
->key_list
);
280 WARN_ON(new && old
&& new->conf
.keyidx
!= old
->conf
.keyidx
);
283 idx
= old
->conf
.keyidx
;
285 idx
= new->conf
.keyidx
;
289 rcu_assign_pointer(sta
->ptk
[idx
], new);
292 rcu_assign_pointer(sta
->gtk
[idx
], new);
297 old
== key_mtx_dereference(sdata
->local
,
298 sdata
->default_unicast_key
);
300 old
== key_mtx_dereference(sdata
->local
,
301 sdata
->default_multicast_key
);
303 old
== key_mtx_dereference(sdata
->local
,
304 sdata
->default_mgmt_key
);
306 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);
310 if (defmgmtkey
&& !new)
311 __ieee80211_set_default_mgmt_key(sdata
, -1);
313 rcu_assign_pointer(sdata
->keys
[idx
], new);
314 if (defunikey
&& new)
315 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
317 if (defmultikey
&& new)
318 __ieee80211_set_default_key(sdata
, new->conf
.keyidx
,
320 if (defmgmtkey
&& new)
321 __ieee80211_set_default_mgmt_key(sdata
,
326 list_del(&old
->list
);
329 struct ieee80211_key
*
330 ieee80211_key_alloc(u32 cipher
, int idx
, size_t key_len
,
332 size_t seq_len
, const u8
*seq
,
333 const struct ieee80211_cipher_scheme
*cs
)
335 struct ieee80211_key
*key
;
338 if (WARN_ON(idx
< 0 || idx
>= NUM_DEFAULT_KEYS
+ NUM_DEFAULT_MGMT_KEYS
))
339 return ERR_PTR(-EINVAL
);
341 key
= kzalloc(sizeof(struct ieee80211_key
) + key_len
, GFP_KERNEL
);
343 return ERR_PTR(-ENOMEM
);
346 * Default to software encryption; we'll later upload the
347 * key to the hardware if possible.
352 key
->conf
.cipher
= cipher
;
353 key
->conf
.keyidx
= idx
;
354 key
->conf
.keylen
= key_len
;
356 case WLAN_CIPHER_SUITE_WEP40
:
357 case WLAN_CIPHER_SUITE_WEP104
:
358 key
->conf
.iv_len
= IEEE80211_WEP_IV_LEN
;
359 key
->conf
.icv_len
= IEEE80211_WEP_ICV_LEN
;
361 case WLAN_CIPHER_SUITE_TKIP
:
362 key
->conf
.iv_len
= IEEE80211_TKIP_IV_LEN
;
363 key
->conf
.icv_len
= IEEE80211_TKIP_ICV_LEN
;
365 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
366 key
->u
.tkip
.rx
[i
].iv32
=
367 get_unaligned_le32(&seq
[2]);
368 key
->u
.tkip
.rx
[i
].iv16
=
369 get_unaligned_le16(seq
);
372 spin_lock_init(&key
->u
.tkip
.txlock
);
374 case WLAN_CIPHER_SUITE_CCMP
:
375 key
->conf
.iv_len
= IEEE80211_CCMP_HDR_LEN
;
376 key
->conf
.icv_len
= IEEE80211_CCMP_MIC_LEN
;
378 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
379 for (j
= 0; j
< IEEE80211_CCMP_PN_LEN
; j
++)
380 key
->u
.ccmp
.rx_pn
[i
][j
] =
381 seq
[IEEE80211_CCMP_PN_LEN
- j
- 1];
384 * Initialize AES key state here as an optimization so that
385 * it does not need to be initialized for every packet.
387 key
->u
.ccmp
.tfm
= ieee80211_aes_key_setup_encrypt(key_data
);
388 if (IS_ERR(key
->u
.ccmp
.tfm
)) {
389 err
= PTR_ERR(key
->u
.ccmp
.tfm
);
394 case WLAN_CIPHER_SUITE_AES_CMAC
:
395 key
->conf
.iv_len
= 0;
396 key
->conf
.icv_len
= sizeof(struct ieee80211_mmie
);
398 for (j
= 0; j
< IEEE80211_CMAC_PN_LEN
; j
++)
399 key
->u
.aes_cmac
.rx_pn
[j
] =
400 seq
[IEEE80211_CMAC_PN_LEN
- j
- 1];
402 * Initialize AES key state here as an optimization so that
403 * it does not need to be initialized for every packet.
405 key
->u
.aes_cmac
.tfm
=
406 ieee80211_aes_cmac_key_setup(key_data
);
407 if (IS_ERR(key
->u
.aes_cmac
.tfm
)) {
408 err
= PTR_ERR(key
->u
.aes_cmac
.tfm
);
415 size_t len
= (seq_len
> MAX_PN_LEN
) ?
416 MAX_PN_LEN
: seq_len
;
418 key
->conf
.iv_len
= cs
->hdr_len
;
419 key
->conf
.icv_len
= cs
->mic_len
;
420 for (i
= 0; i
< IEEE80211_NUM_TIDS
+ 1; i
++)
421 for (j
= 0; j
< len
; j
++)
422 key
->u
.gen
.rx_pn
[i
][j
] =
426 memcpy(key
->conf
.key
, key_data
, key_len
);
427 INIT_LIST_HEAD(&key
->list
);
432 static void ieee80211_key_free_common(struct ieee80211_key
*key
)
434 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_CCMP
)
435 ieee80211_aes_key_free(key
->u
.ccmp
.tfm
);
436 if (key
->conf
.cipher
== WLAN_CIPHER_SUITE_AES_CMAC
)
437 ieee80211_aes_cmac_key_free(key
->u
.aes_cmac
.tfm
);
441 static void __ieee80211_key_destroy(struct ieee80211_key
*key
,
445 ieee80211_key_disable_hw_accel(key
);
448 struct ieee80211_sub_if_data
*sdata
= key
->sdata
;
450 ieee80211_debugfs_key_remove(key
);
452 if (delay_tailroom
) {
453 /* see ieee80211_delayed_tailroom_dec */
454 sdata
->crypto_tx_tailroom_pending_dec
++;
455 schedule_delayed_work(&sdata
->dec_tailroom_needed_wk
,
458 sdata
->crypto_tx_tailroom_needed_cnt
--;
462 ieee80211_key_free_common(key
);
465 static void ieee80211_key_destroy(struct ieee80211_key
*key
,
472 * Synchronize so the TX path can no longer be using
473 * this key before we free/remove it.
477 __ieee80211_key_destroy(key
, delay_tailroom
);
480 void ieee80211_key_free_unused(struct ieee80211_key
*key
)
482 WARN_ON(key
->sdata
|| key
->local
);
483 ieee80211_key_free_common(key
);
486 int ieee80211_key_link(struct ieee80211_key
*key
,
487 struct ieee80211_sub_if_data
*sdata
,
488 struct sta_info
*sta
)
490 struct ieee80211_local
*local
= sdata
->local
;
491 struct ieee80211_key
*old_key
;
495 pairwise
= key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
;
496 idx
= key
->conf
.keyidx
;
497 key
->local
= sdata
->local
;
501 mutex_lock(&sdata
->local
->key_mtx
);
504 old_key
= key_mtx_dereference(sdata
->local
, sta
->ptk
[idx
]);
506 old_key
= key_mtx_dereference(sdata
->local
, sta
->gtk
[idx
]);
508 old_key
= key_mtx_dereference(sdata
->local
, sdata
->keys
[idx
]);
510 increment_tailroom_need_count(sdata
);
512 ieee80211_key_replace(sdata
, sta
, pairwise
, old_key
, key
);
513 ieee80211_key_destroy(old_key
, true);
515 ieee80211_debugfs_key_add(key
);
517 if (!local
->wowlan
) {
518 ret
= ieee80211_key_enable_hw_accel(key
);
520 ieee80211_key_free(key
, true);
525 mutex_unlock(&sdata
->local
->key_mtx
);
530 void ieee80211_key_free(struct ieee80211_key
*key
, bool delay_tailroom
)
536 * Replace key with nothingness if it was ever used.
539 ieee80211_key_replace(key
->sdata
, key
->sta
,
540 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
542 ieee80211_key_destroy(key
, delay_tailroom
);
545 void ieee80211_enable_keys(struct ieee80211_sub_if_data
*sdata
)
547 struct ieee80211_key
*key
;
551 if (WARN_ON(!ieee80211_sdata_running(sdata
)))
554 mutex_lock(&sdata
->local
->key_mtx
);
556 sdata
->crypto_tx_tailroom_needed_cnt
= 0;
558 list_for_each_entry(key
, &sdata
->key_list
, list
) {
559 increment_tailroom_need_count(sdata
);
560 ieee80211_key_enable_hw_accel(key
);
563 mutex_unlock(&sdata
->local
->key_mtx
);
566 void ieee80211_iter_keys(struct ieee80211_hw
*hw
,
567 struct ieee80211_vif
*vif
,
568 void (*iter
)(struct ieee80211_hw
*hw
,
569 struct ieee80211_vif
*vif
,
570 struct ieee80211_sta
*sta
,
571 struct ieee80211_key_conf
*key
,
575 struct ieee80211_local
*local
= hw_to_local(hw
);
576 struct ieee80211_key
*key
, *tmp
;
577 struct ieee80211_sub_if_data
*sdata
;
581 mutex_lock(&local
->key_mtx
);
583 sdata
= vif_to_sdata(vif
);
584 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
)
585 iter(hw
, &sdata
->vif
,
586 key
->sta
? &key
->sta
->sta
: NULL
,
587 &key
->conf
, iter_data
);
589 list_for_each_entry(sdata
, &local
->interfaces
, list
)
590 list_for_each_entry_safe(key
, tmp
,
591 &sdata
->key_list
, list
)
592 iter(hw
, &sdata
->vif
,
593 key
->sta
? &key
->sta
->sta
: NULL
,
594 &key
->conf
, iter_data
);
596 mutex_unlock(&local
->key_mtx
);
598 EXPORT_SYMBOL(ieee80211_iter_keys
);
600 static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data
*sdata
,
601 struct list_head
*keys
)
603 struct ieee80211_key
*key
, *tmp
;
605 sdata
->crypto_tx_tailroom_needed_cnt
-=
606 sdata
->crypto_tx_tailroom_pending_dec
;
607 sdata
->crypto_tx_tailroom_pending_dec
= 0;
609 ieee80211_debugfs_key_remove_mgmt_default(sdata
);
611 list_for_each_entry_safe(key
, tmp
, &sdata
->key_list
, list
) {
612 ieee80211_key_replace(key
->sdata
, key
->sta
,
613 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
615 list_add_tail(&key
->list
, keys
);
618 ieee80211_debugfs_key_update_default(sdata
);
621 void ieee80211_free_keys(struct ieee80211_sub_if_data
*sdata
,
622 bool force_synchronize
)
624 struct ieee80211_local
*local
= sdata
->local
;
625 struct ieee80211_sub_if_data
*vlan
;
626 struct ieee80211_key
*key
, *tmp
;
629 cancel_delayed_work_sync(&sdata
->dec_tailroom_needed_wk
);
631 mutex_lock(&local
->key_mtx
);
633 ieee80211_free_keys_iface(sdata
, &keys
);
635 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
636 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
637 ieee80211_free_keys_iface(vlan
, &keys
);
640 if (!list_empty(&keys
) || force_synchronize
)
642 list_for_each_entry_safe(key
, tmp
, &keys
, list
)
643 __ieee80211_key_destroy(key
, false);
645 WARN_ON_ONCE(sdata
->crypto_tx_tailroom_needed_cnt
||
646 sdata
->crypto_tx_tailroom_pending_dec
);
647 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
) {
648 list_for_each_entry(vlan
, &sdata
->u
.ap
.vlans
, u
.vlan
.list
)
649 WARN_ON_ONCE(vlan
->crypto_tx_tailroom_needed_cnt
||
650 vlan
->crypto_tx_tailroom_pending_dec
);
653 mutex_unlock(&local
->key_mtx
);
656 void ieee80211_free_sta_keys(struct ieee80211_local
*local
,
657 struct sta_info
*sta
)
659 struct ieee80211_key
*key
;
662 mutex_lock(&local
->key_mtx
);
663 for (i
= 0; i
< ARRAY_SIZE(sta
->gtk
); i
++) {
664 key
= key_mtx_dereference(local
, sta
->gtk
[i
]);
667 ieee80211_key_replace(key
->sdata
, key
->sta
,
668 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
670 __ieee80211_key_destroy(key
, true);
673 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++) {
674 key
= key_mtx_dereference(local
, sta
->ptk
[i
]);
677 ieee80211_key_replace(key
->sdata
, key
->sta
,
678 key
->conf
.flags
& IEEE80211_KEY_FLAG_PAIRWISE
,
680 __ieee80211_key_destroy(key
, true);
683 mutex_unlock(&local
->key_mtx
);
686 void ieee80211_delayed_tailroom_dec(struct work_struct
*wk
)
688 struct ieee80211_sub_if_data
*sdata
;
690 sdata
= container_of(wk
, struct ieee80211_sub_if_data
,
691 dec_tailroom_needed_wk
.work
);
694 * The reason for the delayed tailroom needed decrementing is to
695 * make roaming faster: during roaming, all keys are first deleted
696 * and then new keys are installed. The first new key causes the
697 * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
698 * the cost of synchronize_net() (which can be slow). Avoid this
699 * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
700 * key removal for a while, so if we roam the value is larger than
701 * zero and no 0->1 transition happens.
703 * The cost is that if the AP switching was from an AP with keys
704 * to one without, we still allocate tailroom while it would no
705 * longer be needed. However, in the typical (fast) roaming case
706 * within an ESS this usually won't happen.
709 mutex_lock(&sdata
->local
->key_mtx
);
710 sdata
->crypto_tx_tailroom_needed_cnt
-=
711 sdata
->crypto_tx_tailroom_pending_dec
;
712 sdata
->crypto_tx_tailroom_pending_dec
= 0;
713 mutex_unlock(&sdata
->local
->key_mtx
);
716 void ieee80211_gtk_rekey_notify(struct ieee80211_vif
*vif
, const u8
*bssid
,
717 const u8
*replay_ctr
, gfp_t gfp
)
719 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
721 trace_api_gtk_rekey_notify(sdata
, bssid
, replay_ctr
);
723 cfg80211_gtk_rekey_notify(sdata
->dev
, bssid
, replay_ctr
, gfp
);
725 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify
);
727 void ieee80211_get_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
728 struct ieee80211_key_seq
*seq
)
730 struct ieee80211_key
*key
;
733 if (WARN_ON(!(keyconf
->flags
& IEEE80211_KEY_FLAG_GENERATE_IV
)))
736 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
738 switch (key
->conf
.cipher
) {
739 case WLAN_CIPHER_SUITE_TKIP
:
740 seq
->tkip
.iv32
= key
->u
.tkip
.tx
.iv32
;
741 seq
->tkip
.iv16
= key
->u
.tkip
.tx
.iv16
;
743 case WLAN_CIPHER_SUITE_CCMP
:
744 pn64
= atomic64_read(&key
->u
.ccmp
.tx_pn
);
745 seq
->ccmp
.pn
[5] = pn64
;
746 seq
->ccmp
.pn
[4] = pn64
>> 8;
747 seq
->ccmp
.pn
[3] = pn64
>> 16;
748 seq
->ccmp
.pn
[2] = pn64
>> 24;
749 seq
->ccmp
.pn
[1] = pn64
>> 32;
750 seq
->ccmp
.pn
[0] = pn64
>> 40;
752 case WLAN_CIPHER_SUITE_AES_CMAC
:
753 pn64
= atomic64_read(&key
->u
.aes_cmac
.tx_pn
);
754 seq
->ccmp
.pn
[5] = pn64
;
755 seq
->ccmp
.pn
[4] = pn64
>> 8;
756 seq
->ccmp
.pn
[3] = pn64
>> 16;
757 seq
->ccmp
.pn
[2] = pn64
>> 24;
758 seq
->ccmp
.pn
[1] = pn64
>> 32;
759 seq
->ccmp
.pn
[0] = pn64
>> 40;
765 EXPORT_SYMBOL(ieee80211_get_key_tx_seq
);
767 void ieee80211_get_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
768 int tid
, struct ieee80211_key_seq
*seq
)
770 struct ieee80211_key
*key
;
773 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
775 switch (key
->conf
.cipher
) {
776 case WLAN_CIPHER_SUITE_TKIP
:
777 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
779 seq
->tkip
.iv32
= key
->u
.tkip
.rx
[tid
].iv32
;
780 seq
->tkip
.iv16
= key
->u
.tkip
.rx
[tid
].iv16
;
782 case WLAN_CIPHER_SUITE_CCMP
:
783 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
786 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
788 pn
= key
->u
.ccmp
.rx_pn
[tid
];
789 memcpy(seq
->ccmp
.pn
, pn
, IEEE80211_CCMP_PN_LEN
);
791 case WLAN_CIPHER_SUITE_AES_CMAC
:
792 if (WARN_ON(tid
!= 0))
794 pn
= key
->u
.aes_cmac
.rx_pn
;
795 memcpy(seq
->aes_cmac
.pn
, pn
, IEEE80211_CMAC_PN_LEN
);
799 EXPORT_SYMBOL(ieee80211_get_key_rx_seq
);
801 void ieee80211_set_key_tx_seq(struct ieee80211_key_conf
*keyconf
,
802 struct ieee80211_key_seq
*seq
)
804 struct ieee80211_key
*key
;
807 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
809 switch (key
->conf
.cipher
) {
810 case WLAN_CIPHER_SUITE_TKIP
:
811 key
->u
.tkip
.tx
.iv32
= seq
->tkip
.iv32
;
812 key
->u
.tkip
.tx
.iv16
= seq
->tkip
.iv16
;
814 case WLAN_CIPHER_SUITE_CCMP
:
815 pn64
= (u64
)seq
->ccmp
.pn
[5] |
816 ((u64
)seq
->ccmp
.pn
[4] << 8) |
817 ((u64
)seq
->ccmp
.pn
[3] << 16) |
818 ((u64
)seq
->ccmp
.pn
[2] << 24) |
819 ((u64
)seq
->ccmp
.pn
[1] << 32) |
820 ((u64
)seq
->ccmp
.pn
[0] << 40);
821 atomic64_set(&key
->u
.ccmp
.tx_pn
, pn64
);
823 case WLAN_CIPHER_SUITE_AES_CMAC
:
824 pn64
= (u64
)seq
->aes_cmac
.pn
[5] |
825 ((u64
)seq
->aes_cmac
.pn
[4] << 8) |
826 ((u64
)seq
->aes_cmac
.pn
[3] << 16) |
827 ((u64
)seq
->aes_cmac
.pn
[2] << 24) |
828 ((u64
)seq
->aes_cmac
.pn
[1] << 32) |
829 ((u64
)seq
->aes_cmac
.pn
[0] << 40);
830 atomic64_set(&key
->u
.aes_cmac
.tx_pn
, pn64
);
837 EXPORT_SYMBOL_GPL(ieee80211_set_key_tx_seq
);
839 void ieee80211_set_key_rx_seq(struct ieee80211_key_conf
*keyconf
,
840 int tid
, struct ieee80211_key_seq
*seq
)
842 struct ieee80211_key
*key
;
845 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
847 switch (key
->conf
.cipher
) {
848 case WLAN_CIPHER_SUITE_TKIP
:
849 if (WARN_ON(tid
< 0 || tid
>= IEEE80211_NUM_TIDS
))
851 key
->u
.tkip
.rx
[tid
].iv32
= seq
->tkip
.iv32
;
852 key
->u
.tkip
.rx
[tid
].iv16
= seq
->tkip
.iv16
;
854 case WLAN_CIPHER_SUITE_CCMP
:
855 if (WARN_ON(tid
< -1 || tid
>= IEEE80211_NUM_TIDS
))
858 pn
= key
->u
.ccmp
.rx_pn
[IEEE80211_NUM_TIDS
];
860 pn
= key
->u
.ccmp
.rx_pn
[tid
];
861 memcpy(pn
, seq
->ccmp
.pn
, IEEE80211_CCMP_PN_LEN
);
863 case WLAN_CIPHER_SUITE_AES_CMAC
:
864 if (WARN_ON(tid
!= 0))
866 pn
= key
->u
.aes_cmac
.rx_pn
;
867 memcpy(pn
, seq
->aes_cmac
.pn
, IEEE80211_CMAC_PN_LEN
);
874 EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq
);
876 void ieee80211_remove_key(struct ieee80211_key_conf
*keyconf
)
878 struct ieee80211_key
*key
;
880 key
= container_of(keyconf
, struct ieee80211_key
, conf
);
882 assert_key_lock(key
->local
);
885 * if key was uploaded, we assume the driver will/has remove(d)
886 * it, so adjust bookkeeping accordingly
888 if (key
->flags
& KEY_FLAG_UPLOADED_TO_HARDWARE
) {
889 key
->flags
&= ~KEY_FLAG_UPLOADED_TO_HARDWARE
;
891 if (!((key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_MMIC
) ||
892 (key
->conf
.flags
& IEEE80211_KEY_FLAG_GENERATE_IV
) ||
893 (key
->conf
.flags
& IEEE80211_KEY_FLAG_PUT_IV_SPACE
)))
894 increment_tailroom_need_count(key
->sdata
);
897 ieee80211_key_free(key
, false);
899 EXPORT_SYMBOL_GPL(ieee80211_remove_key
);
901 struct ieee80211_key_conf
*
902 ieee80211_gtk_rekey_add(struct ieee80211_vif
*vif
,
903 struct ieee80211_key_conf
*keyconf
)
905 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
906 struct ieee80211_local
*local
= sdata
->local
;
907 struct ieee80211_key
*key
;
910 if (WARN_ON(!local
->wowlan
))
911 return ERR_PTR(-EINVAL
);
913 if (WARN_ON(vif
->type
!= NL80211_IFTYPE_STATION
))
914 return ERR_PTR(-EINVAL
);
916 key
= ieee80211_key_alloc(keyconf
->cipher
, keyconf
->keyidx
,
917 keyconf
->keylen
, keyconf
->key
,
920 return ERR_CAST(key
);
922 if (sdata
->u
.mgd
.mfp
!= IEEE80211_MFP_DISABLED
)
923 key
->conf
.flags
|= IEEE80211_KEY_FLAG_RX_MGMT
;
925 err
= ieee80211_key_link(key
, sdata
, NULL
);
931 EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add
);