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-rw-r--r--net/mac80211/key.c1481
1 files changed, 1481 insertions, 0 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
new file mode 100644
index 000000000..23bb24243
--- /dev/null
+++ b/net/mac80211/key.c
@@ -0,0 +1,1481 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 2015-2017 Intel Deutschland GmbH
+ * Copyright 2018-2020, 2022 Intel Corporation
+ */
+
+#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 <crypto/algapi.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);
+}
+
+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();
+}
+
+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();
+ }
+}
+
+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;
+}
+
+static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
+{
+ struct ieee80211_sub_if_data *sdata = key->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.
+ */
+ if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE &&
+ !(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
+ IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
+ IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
+ increment_tailroom_need_count(sdata);
+
+ 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;
+
+ 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)) {
+ ret = 1;
+ goto out_unsupported;
+ }
+ }
+
+ if (key->conf.link_id >= 0 && sdata->vif.active_links &&
+ !(sdata->vif.active_links & BIT(key->conf.link_id)))
+ return 0;
+
+ 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 |
+ IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
+ 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));
+
+ WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) &&
+ (key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC));
+
+ 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_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_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:
+ /* 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;
+ }
+}
+
+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.link_id >= 0 && sdata->vif.active_links &&
+ !(sdata->vif.active_links & BIT(key->conf.link_id)))
+ return;
+
+ if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
+ IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
+ IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
+ increment_tailroom_need_count(sdata);
+
+ key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+ 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);
+}
+
+static int _ieee80211_set_tx_key(struct ieee80211_key *key, bool force)
+{
+ struct sta_info *sta = key->sta;
+ struct ieee80211_local *local = key->local;
+
+ assert_key_lock(local);
+
+ set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION);
+
+ sta->ptk_idx = key->conf.keyidx;
+
+ if (force || !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT))
+ clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
+ ieee80211_check_fast_xmit(sta);
+
+ return 0;
+}
+
+int ieee80211_set_tx_key(struct ieee80211_key *key)
+{
+ return _ieee80211_set_tx_key(key, false);
+}
+
+static void ieee80211_pairwise_rekey(struct ieee80211_key *old,
+ struct ieee80211_key *new)
+{
+ struct ieee80211_local *local = new->local;
+ struct sta_info *sta = new->sta;
+ int i;
+
+ assert_key_lock(local);
+
+ if (new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX) {
+ /* Extended Key ID key install, initial one or rekey */
+
+ if (sta->ptk_idx != INVALID_PTK_KEYIDX &&
+ !ieee80211_hw_check(&local->hw, AMPDU_KEYBORDER_SUPPORT)) {
+ /* Aggregation Sessions with Extended Key ID must not
+ * mix MPDUs with different keyIDs within one A-MPDU.
+ * Tear down running Tx aggregation sessions and block
+ * new Rx/Tx aggregation requests during rekey to
+ * ensure there are no A-MPDUs when the driver is not
+ * supporting A-MPDU key borders. (Blocking Tx only
+ * would be sufficient but WLAN_STA_BLOCK_BA gets the
+ * job done for the few ms we need it.)
+ */
+ set_sta_flag(sta, WLAN_STA_BLOCK_BA);
+ mutex_lock(&sta->ampdu_mlme.mtx);
+ for (i = 0; i < IEEE80211_NUM_TIDS; i++)
+ ___ieee80211_stop_tx_ba_session(sta, i,
+ AGG_STOP_LOCAL_REQUEST);
+ mutex_unlock(&sta->ampdu_mlme.mtx);
+ }
+ } else if (old) {
+ /* Rekey without Extended Key ID.
+ * Aggregation sessions are OK when running on SW crypto.
+ * A broken remote STA may cause issues not observed with HW
+ * crypto, though.
+ */
+ if (!(old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+ return;
+
+ /* Stop Tx till we are on the new key */
+ old->flags |= KEY_FLAG_TAINTED;
+ ieee80211_clear_fast_xmit(sta);
+ if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
+ set_sta_flag(sta, WLAN_STA_BLOCK_BA);
+ ieee80211_sta_tear_down_BA_sessions(sta,
+ AGG_STOP_LOCAL_REQUEST);
+ }
+ if (!wiphy_ext_feature_isset(local->hw.wiphy,
+ NL80211_EXT_FEATURE_CAN_REPLACE_PTK0)) {
+ pr_warn_ratelimited("Rekeying PTK for STA %pM but driver can't safely do that.",
+ sta->sta.addr);
+ /* Flushing the driver queues *may* help prevent
+ * the clear text leaks and freezes.
+ */
+ ieee80211_flush_queues(local, old->sdata, false);
+ }
+ }
+}
+
+static void __ieee80211_set_default_key(struct ieee80211_link_data *link,
+ int idx, bool uni, bool multi)
+{
+ struct ieee80211_sub_if_data *sdata = link->sdata;
+ 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 (!key)
+ key = key_mtx_dereference(sdata->local, link->gtk[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(link->default_multicast_key, key);
+
+ ieee80211_debugfs_key_update_default(sdata);
+}
+
+void ieee80211_set_default_key(struct ieee80211_link_data *link, int idx,
+ bool uni, bool multi)
+{
+ mutex_lock(&link->sdata->local->key_mtx);
+ __ieee80211_set_default_key(link, idx, uni, multi);
+ mutex_unlock(&link->sdata->local->key_mtx);
+}
+
+static void
+__ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link, int idx)
+{
+ struct ieee80211_sub_if_data *sdata = link->sdata;
+ 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, link->gtk[idx]);
+
+ rcu_assign_pointer(link->default_mgmt_key, key);
+
+ ieee80211_debugfs_key_update_default(sdata);
+}
+
+void ieee80211_set_default_mgmt_key(struct ieee80211_link_data *link,
+ int idx)
+{
+ mutex_lock(&link->sdata->local->key_mtx);
+ __ieee80211_set_default_mgmt_key(link, idx);
+ mutex_unlock(&link->sdata->local->key_mtx);
+}
+
+static void
+__ieee80211_set_default_beacon_key(struct ieee80211_link_data *link, int idx)
+{
+ struct ieee80211_sub_if_data *sdata = link->sdata;
+ struct ieee80211_key *key = NULL;
+
+ assert_key_lock(sdata->local);
+
+ if (idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS &&
+ idx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
+ NUM_DEFAULT_BEACON_KEYS)
+ key = key_mtx_dereference(sdata->local, link->gtk[idx]);
+
+ rcu_assign_pointer(link->default_beacon_key, key);
+
+ ieee80211_debugfs_key_update_default(sdata);
+}
+
+void ieee80211_set_default_beacon_key(struct ieee80211_link_data *link,
+ int idx)
+{
+ mutex_lock(&link->sdata->local->key_mtx);
+ __ieee80211_set_default_beacon_key(link, idx);
+ mutex_unlock(&link->sdata->local->key_mtx);
+}
+
+static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_link_data *link,
+ struct sta_info *sta,
+ bool pairwise,
+ struct ieee80211_key *old,
+ struct ieee80211_key *new)
+{
+ struct link_sta_info *link_sta = sta ? &sta->deflink : NULL;
+ int link_id;
+ int idx;
+ int ret = 0;
+ bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
+ bool is_wep;
+
+ /* caller must provide at least one old/new */
+ if (WARN_ON(!new && !old))
+ return 0;
+
+ if (new) {
+ idx = new->conf.keyidx;
+ is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
+ new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
+ link_id = new->conf.link_id;
+ } else {
+ idx = old->conf.keyidx;
+ is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
+ old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
+ link_id = old->conf.link_id;
+ }
+
+ if (WARN(old && old->conf.link_id != link_id,
+ "old link ID %d doesn't match new link ID %d\n",
+ old->conf.link_id, link_id))
+ return -EINVAL;
+
+ if (link_id >= 0) {
+ if (!link) {
+ link = sdata_dereference(sdata->link[link_id], sdata);
+ if (!link)
+ return -ENOLINK;
+ }
+
+ if (sta) {
+ link_sta = rcu_dereference_protected(sta->link[link_id],
+ lockdep_is_held(&sta->local->sta_mtx));
+ if (!link_sta)
+ return -ENOLINK;
+ }
+ } else {
+ link = &sdata->deflink;
+ }
+
+ if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
+ return -EINVAL;
+
+ WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
+
+ if (new && sta && pairwise) {
+ /* Unicast rekey needs special handling. With Extended Key ID
+ * old is still NULL for the first rekey.
+ */
+ ieee80211_pairwise_rekey(old, new);
+ }
+
+ if (old) {
+ if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
+ ieee80211_key_disable_hw_accel(old);
+
+ if (new)
+ ret = ieee80211_key_enable_hw_accel(new);
+ }
+ } else {
+ if (!new->local->wowlan)
+ ret = ieee80211_key_enable_hw_accel(new);
+ }
+
+ if (ret)
+ return ret;
+
+ if (new)
+ list_add_tail_rcu(&new->list, &sdata->key_list);
+
+ if (sta) {
+ if (pairwise) {
+ rcu_assign_pointer(sta->ptk[idx], new);
+ if (new &&
+ !(new->conf.flags & IEEE80211_KEY_FLAG_NO_AUTO_TX))
+ _ieee80211_set_tx_key(new, true);
+ } else {
+ rcu_assign_pointer(link_sta->gtk[idx], new);
+ }
+ /* Only needed for transition from no key -> key.
+ * Still triggers unnecessary when using Extended Key ID
+ * and installing the second key ID the first time.
+ */
+ if (new && !old)
+ 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,
+ link->default_multicast_key);
+ defmgmtkey = old &&
+ old == key_mtx_dereference(sdata->local,
+ link->default_mgmt_key);
+ defbeaconkey = old &&
+ old == key_mtx_dereference(sdata->local,
+ link->default_beacon_key);
+
+ if (defunikey && !new)
+ __ieee80211_set_default_key(link, -1, true, false);
+ if (defmultikey && !new)
+ __ieee80211_set_default_key(link, -1, false, true);
+ if (defmgmtkey && !new)
+ __ieee80211_set_default_mgmt_key(link, -1);
+ if (defbeaconkey && !new)
+ __ieee80211_set_default_beacon_key(link, -1);
+
+ if (is_wep || pairwise)
+ rcu_assign_pointer(sdata->keys[idx], new);
+ else
+ rcu_assign_pointer(link->gtk[idx], new);
+
+ if (defunikey && new)
+ __ieee80211_set_default_key(link, new->conf.keyidx,
+ true, false);
+ if (defmultikey && new)
+ __ieee80211_set_default_key(link, new->conf.keyidx,
+ false, true);
+ if (defmgmtkey && new)
+ __ieee80211_set_default_mgmt_key(link,
+ new->conf.keyidx);
+ if (defbeaconkey && new)
+ __ieee80211_set_default_beacon_key(link,
+ new->conf.keyidx);
+ }
+
+ if (old)
+ list_del_rcu(&old->list);
+
+ return 0;
+}
+
+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)
+{
+ struct ieee80211_key *key;
+ int i, j, err;
+
+ if (WARN_ON(idx < 0 ||
+ idx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
+ NUM_DEFAULT_BEACON_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.link_id = -1;
+ 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;
+ }
+ memcpy(key->conf.key, key_data, key_len);
+ INIT_LIST_HEAD(&key->list);
+
+ return key;
+}
+
+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;
+ }
+ kfree_sensitive(key);
+}
+
+static void __ieee80211_key_destroy(struct ieee80211_key *key,
+ bool delay_tailroom)
+{
+ 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);
+}
+
+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);
+}
+
+void ieee80211_key_free_unused(struct ieee80211_key *key)
+{
+ WARN_ON(key->sdata || key->local);
+ ieee80211_key_free_common(key);
+}
+
+static bool ieee80211_key_identical(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_key *old,
+ struct ieee80211_key *new)
+{
+ u8 tkip_old[WLAN_KEY_LEN_TKIP], tkip_new[WLAN_KEY_LEN_TKIP];
+ u8 *tk_old, *tk_new;
+
+ if (!old || new->conf.keylen != old->conf.keylen)
+ return false;
+
+ tk_old = old->conf.key;
+ tk_new = new->conf.key;
+
+ /*
+ * In station mode, don't compare the TX MIC key, as it's never used
+ * and offloaded rekeying may not care to send it to the host. This
+ * is the case in iwlwifi, for example.
+ */
+ if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+ new->conf.cipher == WLAN_CIPHER_SUITE_TKIP &&
+ new->conf.keylen == WLAN_KEY_LEN_TKIP &&
+ !(new->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
+ memcpy(tkip_old, tk_old, WLAN_KEY_LEN_TKIP);
+ memcpy(tkip_new, tk_new, WLAN_KEY_LEN_TKIP);
+ memset(tkip_old + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
+ memset(tkip_new + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY, 0, 8);
+ tk_old = tkip_old;
+ tk_new = tkip_new;
+ }
+
+ return !crypto_memneq(tk_old, tk_new, new->conf.keylen);
+}
+
+int ieee80211_key_link(struct ieee80211_key *key,
+ struct ieee80211_link_data *link,
+ struct sta_info *sta)
+{
+ struct ieee80211_sub_if_data *sdata = link->sdata;
+ static atomic_t key_color = ATOMIC_INIT(0);
+ struct ieee80211_key *old_key = NULL;
+ int idx = key->conf.keyidx;
+ bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
+ /*
+ * We want to delay tailroom updates only for station - in that
+ * case it helps roaming speed, but in other cases it hurts and
+ * can cause warnings to appear.
+ */
+ bool delay_tailroom = sdata->vif.type == NL80211_IFTYPE_STATION;
+ int ret = -EOPNOTSUPP;
+
+ mutex_lock(&sdata->local->key_mtx);
+
+ if (sta && pairwise) {
+ struct ieee80211_key *alt_key;
+
+ old_key = key_mtx_dereference(sdata->local, sta->ptk[idx]);
+ alt_key = key_mtx_dereference(sdata->local, sta->ptk[idx ^ 1]);
+
+ /* The rekey code assumes that the old and new key are using
+ * the same cipher. Enforce the assumption for pairwise keys.
+ */
+ if ((alt_key && alt_key->conf.cipher != key->conf.cipher) ||
+ (old_key && old_key->conf.cipher != key->conf.cipher))
+ goto out;
+ } else if (sta) {
+ struct link_sta_info *link_sta = &sta->deflink;
+ int link_id = key->conf.link_id;
+
+ if (link_id >= 0) {
+ link_sta = rcu_dereference_protected(sta->link[link_id],
+ lockdep_is_held(&sta->local->sta_mtx));
+ if (!link_sta) {
+ ret = -ENOLINK;
+ goto out;
+ }
+ }
+
+ old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
+ } else {
+ if (idx < NUM_DEFAULT_KEYS)
+ old_key = key_mtx_dereference(sdata->local,
+ sdata->keys[idx]);
+ if (!old_key)
+ old_key = key_mtx_dereference(sdata->local,
+ link->gtk[idx]);
+ }
+
+ /* Non-pairwise keys must also not switch the cipher on rekey */
+ if (!pairwise) {
+ if (old_key && old_key->conf.cipher != key->conf.cipher)
+ goto out;
+ }
+
+ /*
+ * Silently accept key re-installation without really installing the
+ * new version of the key to avoid nonce reuse or replay issues.
+ */
+ if (ieee80211_key_identical(sdata, old_key, key)) {
+ ieee80211_key_free_unused(key);
+ ret = -EALREADY;
+ goto out;
+ }
+
+ key->local = sdata->local;
+ key->sdata = sdata;
+ key->sta = sta;
+
+ /*
+ * Assign a unique ID to every key so we can easily prevent mixed
+ * key and fragment cache attacks.
+ */
+ key->color = atomic_inc_return(&key_color);
+
+ increment_tailroom_need_count(sdata);
+
+ ret = ieee80211_key_replace(sdata, link, sta, pairwise, old_key, key);
+
+ if (!ret) {
+ ieee80211_debugfs_key_add(key);
+ ieee80211_key_destroy(old_key, delay_tailroom);
+ } else {
+ ieee80211_key_free(key, delay_tailroom);
+ }
+
+ out:
+ mutex_unlock(&sdata->local->key_mtx);
+
+ return ret;
+}
+
+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, NULL, key->sta,
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
+ ieee80211_key_destroy(key, delay_tailroom);
+}
+
+void ieee80211_reenable_keys(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_key *key;
+ struct ieee80211_sub_if_data *vlan;
+
+ lockdep_assert_wiphy(sdata->local->hw.wiphy);
+
+ mutex_lock(&sdata->local->key_mtx);
+
+ sdata->crypto_tx_tailroom_needed_cnt = 0;
+ sdata->crypto_tx_tailroom_pending_dec = 0;
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP) {
+ list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
+ vlan->crypto_tx_tailroom_needed_cnt = 0;
+ vlan->crypto_tx_tailroom_pending_dec = 0;
+ }
+ }
+
+ if (ieee80211_sdata_running(sdata)) {
+ list_for_each_entry(key, &sdata->key_list, list) {
+ increment_tailroom_need_count(sdata);
+ ieee80211_key_enable_hw_accel(key);
+ }
+ }
+
+ mutex_unlock(&sdata->local->key_mtx);
+}
+
+void ieee80211_iter_keys(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta,
+ struct ieee80211_key_conf *key,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_key *key, *tmp;
+ struct ieee80211_sub_if_data *sdata;
+
+ lockdep_assert_wiphy(hw->wiphy);
+
+ mutex_lock(&local->key_mtx);
+ if (vif) {
+ sdata = vif_to_sdata(vif);
+ list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
+ iter(hw, &sdata->vif,
+ key->sta ? &key->sta->sta : NULL,
+ &key->conf, iter_data);
+ } else {
+ list_for_each_entry(sdata, &local->interfaces, list)
+ list_for_each_entry_safe(key, tmp,
+ &sdata->key_list, list)
+ iter(hw, &sdata->vif,
+ key->sta ? &key->sta->sta : NULL,
+ &key->conf, iter_data);
+ }
+ mutex_unlock(&local->key_mtx);
+}
+EXPORT_SYMBOL(ieee80211_iter_keys);
+
+static void
+_ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
+ struct ieee80211_sub_if_data *sdata,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta,
+ struct ieee80211_key_conf *key,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_key *key;
+
+ list_for_each_entry_rcu(key, &sdata->key_list, list) {
+ /* skip keys of station in removal process */
+ if (key->sta && key->sta->removed)
+ continue;
+ if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+ continue;
+
+ iter(hw, &sdata->vif,
+ key->sta ? &key->sta->sta : NULL,
+ &key->conf, iter_data);
+ }
+}
+
+void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta,
+ struct ieee80211_key_conf *key,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_sub_if_data *sdata;
+
+ if (vif) {
+ sdata = vif_to_sdata(vif);
+ _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
+ } else {
+ list_for_each_entry_rcu(sdata, &local->interfaces, list)
+ _ieee80211_iter_keys_rcu(hw, sdata, iter, iter_data);
+ }
+}
+EXPORT_SYMBOL(ieee80211_iter_keys_rcu);
+
+static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
+ struct list_head *keys)
+{
+ struct ieee80211_key *key, *tmp;
+
+ decrease_tailroom_need_count(sdata,
+ sdata->crypto_tx_tailroom_pending_dec);
+ sdata->crypto_tx_tailroom_pending_dec = 0;
+
+ ieee80211_debugfs_key_remove_mgmt_default(sdata);
+ ieee80211_debugfs_key_remove_beacon_default(sdata);
+
+ list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
+ ieee80211_key_replace(key->sdata, NULL, key->sta,
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
+ list_add_tail(&key->list, keys);
+ }
+
+ ieee80211_debugfs_key_update_default(sdata);
+}
+
+void ieee80211_remove_link_keys(struct ieee80211_link_data *link,
+ struct list_head *keys)
+{
+ struct ieee80211_sub_if_data *sdata = link->sdata;
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_key *key, *tmp;
+
+ mutex_lock(&local->key_mtx);
+ list_for_each_entry_safe(key, tmp, &sdata->key_list, list) {
+ if (key->conf.link_id != link->link_id)
+ continue;
+ ieee80211_key_replace(key->sdata, link, key->sta,
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
+ list_add_tail(&key->list, keys);
+ }
+ mutex_unlock(&local->key_mtx);
+}
+
+void ieee80211_free_key_list(struct ieee80211_local *local,
+ struct list_head *keys)
+{
+ struct ieee80211_key *key, *tmp;
+
+ mutex_lock(&local->key_mtx);
+ list_for_each_entry_safe(key, tmp, keys, list)
+ __ieee80211_key_destroy(key, false);
+ mutex_unlock(&local->key_mtx);
+}
+
+void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
+ bool force_synchronize)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_sub_if_data *vlan;
+ struct ieee80211_sub_if_data *master;
+ struct ieee80211_key *key, *tmp;
+ LIST_HEAD(keys);
+
+ cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
+
+ mutex_lock(&local->key_mtx);
+
+ ieee80211_free_keys_iface(sdata, &keys);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP) {
+ list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+ ieee80211_free_keys_iface(vlan, &keys);
+ }
+
+ if (!list_empty(&keys) || force_synchronize)
+ synchronize_net();
+ list_for_each_entry_safe(key, tmp, &keys, list)
+ __ieee80211_key_destroy(key, false);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+ if (sdata->bss) {
+ master = container_of(sdata->bss,
+ struct ieee80211_sub_if_data,
+ u.ap);
+
+ WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
+ master->crypto_tx_tailroom_needed_cnt);
+ }
+ } else {
+ 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->crypto_tx_tailroom_needed_cnt ||
+ vlan->crypto_tx_tailroom_pending_dec);
+ }
+
+ mutex_unlock(&local->key_mtx);
+}
+
+void ieee80211_free_sta_keys(struct ieee80211_local *local,
+ struct sta_info *sta)
+{
+ struct ieee80211_key *key;
+ int i;
+
+ mutex_lock(&local->key_mtx);
+ for (i = 0; i < ARRAY_SIZE(sta->deflink.gtk); i++) {
+ key = key_mtx_dereference(local, sta->deflink.gtk[i]);
+ if (!key)
+ continue;
+ ieee80211_key_replace(key->sdata, NULL, key->sta,
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
+ __ieee80211_key_destroy(key, key->sdata->vif.type ==
+ NL80211_IFTYPE_STATION);
+ }
+
+ for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
+ key = key_mtx_dereference(local, sta->ptk[i]);
+ if (!key)
+ continue;
+ ieee80211_key_replace(key->sdata, NULL, key->sta,
+ key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
+ key, NULL);
+ __ieee80211_key_destroy(key, key->sdata->vif.type ==
+ NL80211_IFTYPE_STATION);
+ }
+
+ mutex_unlock(&local->key_mtx);
+}
+
+void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ sdata = container_of(wk, struct ieee80211_sub_if_data,
+ dec_tailroom_needed_wk.work);
+
+ /*
+ * The reason for the delayed tailroom needed decrementing is to
+ * make roaming faster: during roaming, all keys are first deleted
+ * and then new keys are installed. The first new key causes the
+ * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
+ * the cost of synchronize_net() (which can be slow). Avoid this
+ * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
+ * key removal for a while, so if we roam the value is larger than
+ * zero and no 0->1 transition happens.
+ *
+ * The cost is that if the AP switching was from an AP with keys
+ * to one without, we still allocate tailroom while it would no
+ * longer be needed. However, in the typical (fast) roaming case
+ * within an ESS this usually won't happen.
+ */
+
+ mutex_lock(&sdata->local->key_mtx);
+ decrease_tailroom_need_count(sdata,
+ sdata->crypto_tx_tailroom_pending_dec);
+ sdata->crypto_tx_tailroom_pending_dec = 0;
+ mutex_unlock(&sdata->local->key_mtx);
+}
+
+void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
+ const u8 *replay_ctr, gfp_t gfp)
+{
+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+ trace_api_gtk_rekey_notify(sdata, bssid, replay_ctr);
+
+ cfg80211_gtk_rekey_notify(sdata->dev, bssid, replay_ctr, gfp);
+}
+EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_notify);
+
+void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
+ int tid, struct ieee80211_key_seq *seq)
+{
+ struct ieee80211_key *key;
+ const u8 *pn;
+
+ key = container_of(keyconf, struct ieee80211_key, conf);
+
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_TKIP:
+ if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ seq->tkip.iv32 = key->u.tkip.rx[tid].iv32;
+ seq->tkip.iv16 = key->u.tkip.rx[tid].iv16;
+ break;
+ case WLAN_CIPHER_SUITE_CCMP:
+ case WLAN_CIPHER_SUITE_CCMP_256:
+ if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ if (tid < 0)
+ pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
+ else
+ pn = key->u.ccmp.rx_pn[tid];
+ memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+ if (WARN_ON(tid != 0))
+ return;
+ pn = key->u.aes_cmac.rx_pn;
+ memcpy(seq->aes_cmac.pn, pn, IEEE80211_CMAC_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+ case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+ if (WARN_ON(tid != 0))
+ return;
+ pn = key->u.aes_gmac.rx_pn;
+ memcpy(seq->aes_gmac.pn, pn, IEEE80211_GMAC_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_256:
+ if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ if (tid < 0)
+ pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
+ else
+ pn = key->u.gcmp.rx_pn[tid];
+ memcpy(seq->gcmp.pn, pn, IEEE80211_GCMP_PN_LEN);
+ break;
+ }
+}
+EXPORT_SYMBOL(ieee80211_get_key_rx_seq);
+
+void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
+ int tid, struct ieee80211_key_seq *seq)
+{
+ struct ieee80211_key *key;
+ u8 *pn;
+
+ key = container_of(keyconf, struct ieee80211_key, conf);
+
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_TKIP:
+ if (WARN_ON(tid < 0 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ key->u.tkip.rx[tid].iv32 = seq->tkip.iv32;
+ key->u.tkip.rx[tid].iv16 = seq->tkip.iv16;
+ break;
+ case WLAN_CIPHER_SUITE_CCMP:
+ case WLAN_CIPHER_SUITE_CCMP_256:
+ if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ if (tid < 0)
+ pn = key->u.ccmp.rx_pn[IEEE80211_NUM_TIDS];
+ else
+ pn = key->u.ccmp.rx_pn[tid];
+ memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+ if (WARN_ON(tid != 0))
+ return;
+ pn = key->u.aes_cmac.rx_pn;
+ memcpy(pn, seq->aes_cmac.pn, IEEE80211_CMAC_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+ case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+ if (WARN_ON(tid != 0))
+ return;
+ pn = key->u.aes_gmac.rx_pn;
+ memcpy(pn, seq->aes_gmac.pn, IEEE80211_GMAC_PN_LEN);
+ break;
+ case WLAN_CIPHER_SUITE_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_256:
+ if (WARN_ON(tid < -1 || tid >= IEEE80211_NUM_TIDS))
+ return;
+ if (tid < 0)
+ pn = key->u.gcmp.rx_pn[IEEE80211_NUM_TIDS];
+ else
+ pn = key->u.gcmp.rx_pn[tid];
+ memcpy(pn, seq->gcmp.pn, IEEE80211_GCMP_PN_LEN);
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(ieee80211_set_key_rx_seq);
+
+void ieee80211_remove_key(struct ieee80211_key_conf *keyconf)
+{
+ struct ieee80211_key *key;
+
+ key = container_of(keyconf, struct ieee80211_key, conf);
+
+ assert_key_lock(key->local);
+
+ /*
+ * if key was uploaded, we assume the driver will/has remove(d)
+ * it, so adjust bookkeeping accordingly
+ */
+ if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
+ key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+ if (!(key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC |
+ IEEE80211_KEY_FLAG_PUT_MIC_SPACE |
+ IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
+ increment_tailroom_need_count(key->sdata);
+ }
+
+ ieee80211_key_free(key, false);
+}
+EXPORT_SYMBOL_GPL(ieee80211_remove_key);
+
+struct ieee80211_key_conf *
+ieee80211_gtk_rekey_add(struct ieee80211_vif *vif,
+ struct ieee80211_key_conf *keyconf)
+{
+ struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_key *key;
+ int err;
+
+ if (WARN_ON(!local->wowlan))
+ return ERR_PTR(-EINVAL);
+
+ if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
+ return ERR_PTR(-EINVAL);
+
+ key = ieee80211_key_alloc(keyconf->cipher, keyconf->keyidx,
+ keyconf->keylen, keyconf->key,
+ 0, NULL);
+ if (IS_ERR(key))
+ return ERR_CAST(key);
+
+ if (sdata->u.mgd.mfp != IEEE80211_MFP_DISABLED)
+ key->conf.flags |= IEEE80211_KEY_FLAG_RX_MGMT;
+
+ /* FIXME: this function needs to get a link ID */
+ err = ieee80211_key_link(key, &sdata->deflink, NULL);
+ if (err)
+ return ERR_PTR(err);
+
+ return &key->conf;
+}
+EXPORT_SYMBOL_GPL(ieee80211_gtk_rekey_add);
+
+void ieee80211_key_mic_failure(struct ieee80211_key_conf *keyconf)
+{
+ struct ieee80211_key *key;
+
+ key = container_of(keyconf, struct ieee80211_key, conf);
+
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+ key->u.aes_cmac.icverrors++;
+ break;
+ case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+ case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+ key->u.aes_gmac.icverrors++;
+ break;
+ default:
+ /* ignore the others for now, we don't keep counters now */
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(ieee80211_key_mic_failure);
+
+void ieee80211_key_replay(struct ieee80211_key_conf *keyconf)
+{
+ struct ieee80211_key *key;
+
+ key = container_of(keyconf, struct ieee80211_key, conf);
+
+ switch (key->conf.cipher) {
+ case WLAN_CIPHER_SUITE_CCMP:
+ case WLAN_CIPHER_SUITE_CCMP_256:
+ key->u.ccmp.replays++;
+ break;
+ case WLAN_CIPHER_SUITE_AES_CMAC:
+ case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+ key->u.aes_cmac.replays++;
+ break;
+ case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+ case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+ key->u.aes_gmac.replays++;
+ break;
+ case WLAN_CIPHER_SUITE_GCMP:
+ case WLAN_CIPHER_SUITE_GCMP_256:
+ key->u.gcmp.replays++;
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(ieee80211_key_replay);
+
+int ieee80211_key_switch_links(struct ieee80211_sub_if_data *sdata,
+ unsigned long del_links_mask,
+ unsigned long add_links_mask)
+{
+ struct ieee80211_key *key;
+ int ret;
+
+ list_for_each_entry(key, &sdata->key_list, list) {
+ if (key->conf.link_id < 0 ||
+ !(del_links_mask & BIT(key->conf.link_id)))
+ continue;
+
+ /* shouldn't happen for per-link keys */
+ WARN_ON(key->sta);
+
+ ieee80211_key_disable_hw_accel(key);
+ }
+
+ list_for_each_entry(key, &sdata->key_list, list) {
+ if (key->conf.link_id < 0 ||
+ !(add_links_mask & BIT(key->conf.link_id)))
+ continue;
+
+ /* shouldn't happen for per-link keys */
+ WARN_ON(key->sta);
+
+ ret = ieee80211_key_enable_hw_accel(key);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}