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);