cregit-Linux how code gets into the kernel

Release 4.11 net/mac80211/key.c

Directory: net/mac80211
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007-2008  Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright 2015       Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/if_ether.h>
#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "debugfs_key.h"
#include "aes_ccm.h"
#include "aes_cmac.h"
#include "aes_gmac.h"
#include "aes_gcm.h"


/**
 * DOC: Key handling basics
 *
 * Key handling in mac80211 is done based on per-interface (sub_if_data)
 * keys and per-station keys. Since each station belongs to an interface,
 * each station key also belongs to that interface.
 *
 * Hardware acceleration is done on a best-effort basis for algorithms
 * that are implemented in software,  for each key the hardware is asked
 * to enable that key for offloading but if it cannot do that the key is
 * simply kept for software encryption (unless it is for an algorithm
 * that isn't implemented in software).
 * There is currently no way of knowing whether a key is handled in SW
 * or HW except by looking into debugfs.
 *
 * All key management is internally protected by a mutex. Within all
 * other parts of mac80211, key references are, just as STA structure
 * references, protected by RCU. Note, however, that some things are
 * unprotected, namely the key->sta dereferences within the hardware
 * acceleration functions. This means that sta_info_destroy() must
 * remove the key which waits for an RCU grace period.
 */


static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };




static void assert_key_lock(struct ieee80211_local *local)
{
	lockdep_assert_held(&local->key_mtx);
}


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static void

update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
{
	struct ieee80211_sub_if_data *vlan;

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return;

	/* crypto_tx_tailroom_needed_cnt is protected by this */
	assert_key_lock(sdata->local);

	rcu_read_lock();

	list_for_each_entry_rcu(vlan, &sdata->u.ap.vlans, u.vlan.list)
		vlan->crypto_tx_tailroom_needed_cnt += delta;

	rcu_read_unlock();
}


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static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
{
	/*
         * When this count is zero, SKB resizing for allocating tailroom
         * for IV or MMIC is skipped. But, this check has created two race
         * cases in xmit path while transiting from zero count to one:
         *
         * 1. SKB resize was skipped because no key was added but just before
         * the xmit key is added and SW encryption kicks off.
         *
         * 2. SKB resize was skipped because all the keys were hw planted but
         * just before xmit one of the key is deleted and SW encryption kicks
         * off.
         *
         * In both the above case SW encryption will find not enough space for
         * tailroom and exits with WARN_ON. (See WARN_ONs at wpa.c)
         *
         * Solution has been explained at
         * http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
         */

	assert_key_lock(sdata->local);

	update_vlan_tailroom_need_count(sdata, 1);

	if (!sdata->crypto_tx_tailroom_needed_cnt++) {
		/*
                 * Flush all XMIT packets currently using HW encryption or no
                 * encryption at all if the count transition is from 0 -> 1.
                 */
		synchronize_net();
	}
}


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Michal Kazior717.50%133.33%


Total40100.00%3100.00%






static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
					 int delta)
{
	assert_key_lock(sdata->local);

	WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);

	update_vlan_tailroom_need_count(sdata, -delta);
	sdata->crypto_tx_tailroom_needed_cnt -= delta;
}


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static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
{
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	int ret = -EOPNOTSUPP;

	might_sleep();

	if (key->flags & KEY_FLAG_TAINTED) {
		/* If we get here, it's during resume and the key is
                 * tainted so shouldn't be used/programmed any more.
                 * However, its flags may still indicate that it was
                 * programmed into the device (since we're in resume)
                 * so clear that flag now to avoid trying to remove
                 * it again later.
                 */
		key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
		return -EINVAL;
	}

	if (!key->local->ops->set_key)
		goto out_unsupported;

	assert_key_lock(key->local);

	sta = key->sta;

	/*
         * If this is a per-STA GTK, check if it
         * is supported; if not, return.
         */
	if (sta && !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE) &&
	    !ieee80211_hw_check(&key->local->hw, SUPPORTS_PER_STA_GTK))
		goto out_unsupported;

	if (sta && !sta->uploaded)
		goto out_unsupported;

	sdata = key->sdata;
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
		/*
                 * The driver doesn't know anything about VLAN interfaces.
                 * Hence, don't send GTKs for VLAN interfaces to the driver.
                 */
		if (!(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
			goto out_unsupported;
	}

	ret = drv_set_key(key->local, SET_KEY, sdata,
			  sta ? &sta->sta : NULL, &key->conf);

	if (!ret) {
		key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;

		if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
		      (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
			decrease_tailroom_need_count(sdata, 1);

		WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
			(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));

		return 0;
	}

	if (ret != -ENOSPC && ret != -EOPNOTSUPP && ret != 1)
		sdata_err(sdata,
			  "failed to set key (%d, %pM) to hardware (%d)\n",
			  key->conf.keyidx,
			  sta ? sta->sta.addr : bcast_addr, ret);

 out_unsupported:
	switch (key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
	case WLAN_CIPHER_SUITE_TKIP:
	case WLAN_CIPHER_SUITE_CCMP:
	case WLAN_CIPHER_SUITE_CCMP_256:
	case WLAN_CIPHER_SUITE_AES_CMAC:
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		/* all of these we can do in software - if driver can */
		if (ret == 1)
			return 0;
		if (ieee80211_hw_check(&key->local->hw, SW_CRYPTO_CONTROL))
			return -EINVAL;
		return 0;
	default:
		return -EINVAL;
	}
}


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Arik Nemtsov236.08%14.00%


Helmut Schaa195.03%14.00%


Jouni Malinen184.76%416.00%


Yogesh Ashok Powar153.97%14.00%


Michal Kazior51.32%14.00%


Joe Perches20.53%14.00%


Ido Yariv10.26%14.00%


Total378100.00%25100.00%






static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
{
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	int ret;

	might_sleep();

	if (!key || !key->local->ops->set_key)
		return;

	assert_key_lock(key->local);

	if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
		return;

	sta = key->sta;
	sdata = key->sdata;

	if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
	      (key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
		increment_tailroom_need_count(sdata);

	ret = drv_set_key(key->local, DISABLE_KEY, sdata,
			  sta ? &sta->sta : NULL, &key->conf);

	if (ret)
		sdata_err(sdata,
			  "failed to remove key (%d, %pM) from hardware (%d)\n",
			  key->conf.keyidx,
			  sta ? sta->sta.addr : bcast_addr, ret);

	key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
}


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Joe Perches21.20%16.67%


Ido Yariv10.60%16.67%


Total166100.00%15100.00%






static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
					int idx, bool uni, bool multi)
{
	struct ieee80211_key *key = NULL;

	assert_key_lock(sdata->local);

	if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);

	if (uni) {
		rcu_assign_pointer(sdata->default_unicast_key, key);
		ieee80211_check_fast_xmit_iface(sdata);
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
			drv_set_default_unicast_key(sdata->local, sdata, idx);
	}

	if (multi)
		rcu_assign_pointer(sdata->default_multicast_key, key);

	ieee80211_debugfs_key_update_default(sdata);
}


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void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
			       bool uni, bool multi)
{
	mutex_lock(&sdata->local->key_mtx);
	__ieee80211_set_default_key(sdata, idx, uni, multi);
	mutex_unlock(&sdata->local->key_mtx);
}


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static void

__ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata, int idx)
{
	struct ieee80211_key *key = NULL;

	assert_key_lock(sdata->local);

	if (idx >= NUM_DEFAULT_KEYS &&
	    idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
		key = key_mtx_dereference(sdata->local, sdata->keys[idx]);

	rcu_assign_pointer(sdata->default_mgmt_key, key);

	ieee80211_debugfs_key_update_default(sdata);
}


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void ieee80211_set_default_mgmt_key(struct ieee80211_sub_if_data *sdata,
				    int idx)
{
	mutex_lock(&sdata->local->key_mtx);
	__ieee80211_set_default_mgmt_key(sdata, idx);
	mutex_unlock(&sdata->local->key_mtx);
}



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static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
				  struct sta_info *sta,
				  bool pairwise,
				  struct ieee80211_key *old,
				  struct ieee80211_key *new)
{
	int idx;
	bool defunikey, defmultikey, defmgmtkey;

	/* caller must provide at least one old/new */
	if (WARN_ON(!new && !old))
		return;

	if (new)
		list_add_tail_rcu(&new->list, &sdata->key_list);

	WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);

	if (old)
		idx = old->conf.keyidx;
	else
		idx = new->conf.keyidx;

	if (sta) {
		if (pairwise) {
			rcu_assign_pointer(sta->ptk[idx], new);
			sta->ptk_idx = idx;
			ieee80211_check_fast_xmit(sta);
		} else {
			rcu_assign_pointer(sta->gtk[idx], new);
		}
		ieee80211_check_fast_rx(sta);
	} else {
		defunikey = old &&
			old == key_mtx_dereference(sdata->local,
						sdata->default_unicast_key);
		defmultikey = old &&
			old == key_mtx_dereference(sdata->local,
						sdata->default_multicast_key);
		defmgmtkey = old &&
			old == key_mtx_dereference(sdata->local,
						sdata->default_mgmt_key);

		if (defunikey && !new)
			__ieee80211_set_default_key(sdata, -1, true, false);
		if (defmultikey && !new)
			__ieee80211_set_default_key(sdata, -1, false, true);
		if (defmgmtkey && !new)
			__ieee80211_set_default_mgmt_key(sdata, -1);

		rcu_assign_pointer(sdata->keys[idx], new);
		if (defunikey && new)
			__ieee80211_set_default_key(sdata, new->conf.keyidx,
						    true, false);
		if (defmultikey && new)
			__ieee80211_set_default_key(sdata, new->conf.keyidx,
						    false, true);
		if (defmgmtkey && new)
			__ieee80211_set_default_mgmt_key(sdata,
							 new->conf.keyidx);
	}

	if (old)
		list_del_rcu(&old->list);
}


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Total354100.00%14100.00%





struct ieee80211_key *

ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
		    const u8 *key_data,
		    size_t seq_len, const u8 *seq,
		    const struct ieee80211_cipher_scheme *cs)
{
	struct ieee80211_key *key;
	int i, j, err;

	if (WARN_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS))
		return ERR_PTR(-EINVAL);

	key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
	if (!key)
		return ERR_PTR(-ENOMEM);

	/*
         * Default to software encryption; we'll later upload the
         * key to the hardware if possible.
         */
	key->conf.flags = 0;
	key->flags = 0;

	key->conf.cipher = cipher;
	key->conf.keyidx = idx;
	key->conf.keylen = key_len;
	switch (cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
		key->conf.iv_len = IEEE80211_WEP_IV_LEN;
		key->conf.icv_len = IEEE80211_WEP_ICV_LEN;
		break;
	case WLAN_CIPHER_SUITE_TKIP:
		key->conf.iv_len = IEEE80211_TKIP_IV_LEN;
		key->conf.icv_len = IEEE80211_TKIP_ICV_LEN;
		if (seq) {
			for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
				key->u.tkip.rx[i].iv32 =
					get_unaligned_le32(&seq[2]);
				key->u.tkip.rx[i].iv16 =
					get_unaligned_le16(seq);
			}
		}
		spin_lock_init(&key->u.tkip.txlock);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
		key->conf.iv_len = IEEE80211_CCMP_HDR_LEN;
		key->conf.icv_len = IEEE80211_CCMP_MIC_LEN;
		if (seq) {
			for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
				for (j = 0; j < IEEE80211_CCMP_PN_LEN; j++)
					key->u.ccmp.rx_pn[i][j] =
						seq[IEEE80211_CCMP_PN_LEN - j - 1];
		}
		/*
                 * Initialize AES key state here as an optimization so that
                 * it does not need to be initialized for every packet.
                 */
		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
			key_data, key_len, IEEE80211_CCMP_MIC_LEN);
		if (IS_ERR(key->u.ccmp.tfm)) {
			err = PTR_ERR(key->u.ccmp.tfm);
			kfree(key);
			return ERR_PTR(err);
		}
		break;
	case WLAN_CIPHER_SUITE_CCMP_256:
		key->conf.iv_len = IEEE80211_CCMP_256_HDR_LEN;
		key->conf.icv_len = IEEE80211_CCMP_256_MIC_LEN;
		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
			for (j = 0; j < IEEE80211_CCMP_256_PN_LEN; j++)
				key->u.ccmp.rx_pn[i][j] =
					seq[IEEE80211_CCMP_256_PN_LEN - j - 1];
		/* Initialize AES key state here as an optimization so that
                 * it does not need to be initialized for every packet.
                 */
		key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(
			key_data, key_len, IEEE80211_CCMP_256_MIC_LEN);
		if (IS_ERR(key->u.ccmp.tfm)) {
			err = PTR_ERR(key->u.ccmp.tfm);
			kfree(key);
			return ERR_PTR(err);
		}
		break;
	case WLAN_CIPHER_SUITE_AES_CMAC:
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		key->conf.iv_len = 0;
		if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
			key->conf.icv_len = sizeof(struct ieee80211_mmie);
		else
			key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
		if (seq)
			for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
				key->u.aes_cmac.rx_pn[j] =
					seq[IEEE80211_CMAC_PN_LEN - j - 1];
		/*
                 * Initialize AES key state here as an optimization so that
                 * it does not need to be initialized for every packet.
                 */
		key->u.aes_cmac.tfm =
			ieee80211_aes_cmac_key_setup(key_data, key_len);
		if (IS_ERR(key->u.aes_cmac.tfm)) {
			err = PTR_ERR(key->u.aes_cmac.tfm);
			kfree(key);
			return ERR_PTR(err);
		}
		break;
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		key->conf.iv_len = 0;
		key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
		if (seq)
			for (j = 0; j < IEEE80211_GMAC_PN_LEN; j++)
				key->u.aes_gmac.rx_pn[j] =
					seq[IEEE80211_GMAC_PN_LEN - j - 1];
		/* Initialize AES key state here as an optimization so that
                 * it does not need to be initialized for every packet.
                 */
		key->u.aes_gmac.tfm =
			ieee80211_aes_gmac_key_setup(key_data, key_len);
		if (IS_ERR(key->u.aes_gmac.tfm)) {
			err = PTR_ERR(key->u.aes_gmac.tfm);
			kfree(key);
			return ERR_PTR(err);
		}
		break;
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		key->conf.iv_len = IEEE80211_GCMP_HDR_LEN;
		key->conf.icv_len = IEEE80211_GCMP_MIC_LEN;
		for (i = 0; seq && i < IEEE80211_NUM_TIDS + 1; i++)
			for (j = 0; j < IEEE80211_GCMP_PN_LEN; j++)
				key->u.gcmp.rx_pn[i][j] =
					seq[IEEE80211_GCMP_PN_LEN - j - 1];
		/* Initialize AES key state here as an optimization so that
                 * it does not need to be initialized for every packet.
                 */
		key->u.gcmp.tfm = ieee80211_aes_gcm_key_setup_encrypt(key_data,
								      key_len);
		if (IS_ERR(key->u.gcmp.tfm)) {
			err = PTR_ERR(key->u.gcmp.tfm);
			kfree(key);
			return ERR_PTR(err);
		}
		break;
	default:
		if (cs) {
			if (seq_len && seq_len != cs->pn_len) {
				kfree(key);
				return ERR_PTR(-EINVAL);
			}

			key->conf.iv_len = cs->hdr_len;
			key->conf.icv_len = cs->mic_len;
			for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
				for (j = 0; j < seq_len; j++)
					key->u.gen.rx_pn[i][j] =
							seq[seq_len - j - 1];
			key->flags |= KEY_FLAG_CIPHER_SCHEME;
		}
	}
	memcpy(key->conf.key, key_data, key_len);
	INIT_LIST_HEAD(&key->list);

	return key;
}


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Max Stepanov848.07%14.55%


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Ben Hutchings302.88%14.55%


Cedric Izoard60.58%14.55%


Petr Štetiar40.38%14.55%


Total1041100.00%22100.00%






static void ieee80211_key_free_common(struct ieee80211_key *key)
{
	switch (key->conf.cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
	case WLAN_CIPHER_SUITE_CCMP_256:
		ieee80211_aes_key_free(key->u.ccmp.tfm);
		break;
	case WLAN_CIPHER_SUITE_AES_CMAC:
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
		break;
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		ieee80211_aes_gmac_key_free(key->u.aes_gmac.tfm);
		break;
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		ieee80211_aes_gcm_key_free(key->u.gcmp.tfm);
		break;
	}
	kzfree(key);
}


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static void __ieee80211_key_destroy(struct ieee80211_key *key,
				    bool delay_tailroom)
{
	if (key->local)
		ieee80211_key_disable_hw_accel(key);

	if (key->local) {
		struct ieee80211_sub_if_data *sdata = key->sdata;

		ieee80211_debugfs_key_remove(key);

		if (delay_tailroom) {
			/* see ieee80211_delayed_tailroom_dec */
			sdata->crypto_tx_tailroom_pending_dec++;
			schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
					      HZ/2);
		} else {
			decrease_tailroom_need_count(sdata, 1);
		}
	}

	ieee80211_key_free_common(key);
}


Contributors
PersonTokensPropCommitsCommitProp
Johannes Berg7081.40%457.14%


Jouni Malinen66.98%114.29%


Michal Kazior55.81%114.29%


Yogesh Ashok Powar55.81%114.29%


Total86100.00%7100.00%






static void ieee80211_key_destroy(struct ieee80211_key *key,
				  bool delay_tailroom)
{
	if (!key)
		return;

	/*
         * Synchronize so the TX path and rcu key iterators
         * can no longer be using this key before we free/remove it.
         */
	synchronize_net();

	__ieee80211_key_destroy(key, delay_tailroom);
}


Contributors
PersonTokensPropCommitsCommitProp
Johannes Berg3096.77%150.00%


Eliad Peller13.23%150.00%


Total31100.00%2100.00%






void ieee80211_key_free_unused(struct ieee80211_key *key)
{
	WARN_ON(key->sdata || key->local);
	ieee80211_key_free_common(key);
}


Contributors
PersonTokensPropCommitsCommitProp
Johannes Berg26100.00%2100.00%


Total26100.00%2100.00%






int ieee80211_key_link(struct ieee80211_key *key,
		       struct ieee80211_sub_if_data *sdata,
		       struct sta_info *sta)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_key *old_key;
	int idx, ret;
	bool pairwise;

	pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
	idx = key->conf.keyidx;
	key->local = sdata->local;
	key->sdata = sdata;
	key->sta = sta;

	mutex_lock(&sdata->local->key_mtx);

	if (sta && pairwise)
		old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
	else if (sta)
		old_key = key_mtx_dereference(sdata->local, sta->gtk[idx]);
	else
		old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);

	increment_tailroom_need_count(sdata);

	ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
	ieee80211_key_destroy(old_key, true);

	ieee80211_debugfs_key_add(key);

	if (!local->wowlan) {
		ret = ieee80211_key_enable_hw_accel(key);
		if (ret)
			ieee80211_key_free(key, true);
	} else {
		ret = 0;
	}

	mutex_unlock(&sdata->local->key_mtx);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Johannes Berg20992.07%1482.35%


Mariusz Kozlowski104.41%15.88%


Yogesh Ashok Powar52.20%15.88%


Max Stepanov31.32%15.88%


Total227100.00%17100.00%






void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
{
	if (!key)
		return;

	/*
         * Replace key with nothingness if it was ever used.
         */
	if (key->sdata)
		ieee80211_key_replace(key->sdata, key->sta,
				key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
				key, NULL);
	ieee80211_key_destroy(key, delay_tailroom);
}


Contributors
PersonTokensPropCommitsCommitProp
Johannes Berg56100.00%7100.00%


Total56100.00%7100.00%






void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_key *key;
	struct ieee80211_sub_if_data *vlan;

	ASSERT_RTNL();

	if (WARN_ON(!ieee80211_sdata_running(sdata)))
		return;

	mutex_lock(&sdata->local->key_mtx);

	WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
		     sdata->crypto_tx_tailroom_pending_dec);

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
			WARN_ON_ONCE(vlan->