iwlwifi: default WEP HW encryption

This patch adds HW encryption support in default WEP mode.
When no key mapping key/pairwise key is used. The key is broadcast key
is used as default/global/static key.
This code assumes that group cast key is added after pairwise key.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 220 insertions, 40 deletions

diff --git a/drivers/net/wireless/iwlwifi/Makefile b/drivers/net/wireless/iwlwifi/Makefile
index 2751e8aa97d7..741ea346a295 100644
--- a/drivers/net/wireless/iwlwifi/Makefile
+++ b/drivers/net/wireless/iwlwifi/Makefile
@@ -22,5 +22,5 @@ endif
 
 
 obj-$(CONFIG_IWL4965)   += iwl4965.o
-iwl4965-objs            = iwl4965-base.o iwl-4965.o iwl-4965-rs.o
+iwl4965-objs            = iwl4965-base.o iwl-4965.o iwl-4965-rs.o iwl-sta.o
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.h b/drivers/net/wireless/iwlwifi/iwl-4965.h
index 65e536782706..93df29e4689a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.h
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.h
@@ -1112,6 +1112,9 @@ struct iwl_priv {
         spinlock_t sta_lock;
         int num_stations;
         struct iwl4965_station_entry stations[IWL_STATION_COUNT];
+        struct iwl_wep_key wep_keys[WEP_KEYS_MAX];
+        u8 default_wep_key;
+        u8 key_mapping_key;
 
         /* Indication if ieee80211_ops->open has been called */
         u8 is_open;
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
new file mode 100644
index 000000000000..a48e228e2ffd
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -0,0 +1,119 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
+ *
+ * Portions of this file are derived from the ipw3945 project, as well
+ * as portions of the ieee80211 subsystem header files.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ * Contact Information:
+ * James P. Ketrenos <ipw2100-admin@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+
+#include <net/mac80211.h>
+
+#include "iwl-eeprom.h"
+#include "iwl-4965.h"
+#include "iwl-core.h"
+#include "iwl-sta.h"
+#include "iwl-io.h"
+#include "iwl-helpers.h"
+
+int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
+{
+        int i, not_empty = 0;
+        u8 buff[sizeof(struct iwl_wep_cmd) +
+                sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
+        struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
+        size_t cmd_size  = sizeof(struct iwl_wep_cmd);
+        struct iwl_host_cmd cmd = {
+                .id = REPLY_WEPKEY,
+                .data = wep_cmd,
+                .meta.flags = CMD_ASYNC,
+        };
+
+        memset(wep_cmd, 0, cmd_size +
+                        (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
+
+        for (i = 0; i < WEP_KEYS_MAX ; i++) {
+                wep_cmd->key[i].key_index = i;
+                if (priv->wep_keys[i].key_size) {
+                        wep_cmd->key[i].key_offset = i;
+                        not_empty = 1;
+                } else {
+                        wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
+                }
+
+                wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
+                memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
+                                priv->wep_keys[i].key_size);
+        }
+
+        wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
+        wep_cmd->num_keys = WEP_KEYS_MAX;
+
+        cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
+
+        cmd.len = cmd_size;
+
+        if (not_empty || send_if_empty)
+                return iwl_send_cmd(priv, &cmd);
+        else
+                return 0;
+}
+
+int iwl_remove_default_wep_key(struct iwl_priv *priv,
+                               struct ieee80211_key_conf *key)
+{
+        int ret;
+        unsigned long flags;
+
+        spin_lock_irqsave(&priv->sta_lock, flags);
+        priv->default_wep_key--;
+        memset(&priv->wep_keys[key->keyidx], 0, sizeof(priv->wep_keys[0]));
+        ret = iwl_send_static_wepkey_cmd(priv, 1);
+        spin_unlock_irqrestore(&priv->sta_lock, flags);
+
+        return ret;
+}
+
+int iwl_set_default_wep_key(struct iwl_priv *priv,
+                            struct ieee80211_key_conf *keyconf)
+{
+        int ret;
+        unsigned long flags;
+
+        keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
+        keyconf->hw_key_idx = keyconf->keyidx;
+        priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
+
+        spin_lock_irqsave(&priv->sta_lock, flags);
+        priv->default_wep_key++;
+
+        priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
+        memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
+                                                        keyconf->keylen);
+
+        ret = iwl_send_static_wepkey_cmd(priv, 0);
+        spin_unlock_irqrestore(&priv->sta_lock, flags);
+
+        return ret;
+}
+
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.h b/drivers/net/wireless/iwlwifi/iwl-sta.h
new file mode 100644
index 000000000000..50e9f1470d8d
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.h
@@ -0,0 +1,46 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
+ *
+ * Portions of this file are derived from the ipw3945 project, as well
+ * as portions of the ieee80211 subsystem header files.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called LICENSE.
+ *
+ * Contact Information:
+ * James P. Ketrenos <ipw2100-admin@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+#ifndef __iwl_sta_h__
+#define __iwl_sta_h__
+
+#include <net/mac80211.h>
+
+#include "iwl-eeprom.h"
+#include "iwl-core.h"
+#include "iwl-4965.h"
+#include "iwl-io.h"
+#include "iwl-helpers.h"
+
+int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty);
+int iwl_remove_default_wep_key(struct iwl_priv *priv,
+                                struct ieee80211_key_conf *key);
+int iwl_set_default_wep_key(struct iwl_priv *priv,
+                                struct ieee80211_key_conf *key);
+
+#endif /* __iwl_sta_h__ */
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index ecc9cba62bf9..dfd2b75492e6 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -50,6 +50,7 @@
 #include "iwl-core.h"
 #include "iwl-io.h"
 #include "iwl-helpers.h"
+#include "iwl-sta.h"
 
 static int iwl4965_tx_queue_update_write_ptr(struct iwl_priv *priv,
                                   struct iwl4965_tx_queue *txq);
@@ -941,6 +942,9 @@ static int iwl4965_commit_rxon(struct iwl_priv *priv)
                         return -EIO;
                 }
                 priv->assoc_station_added = 1;
+                if (priv->default_wep_key &&
+                    iwl_send_static_wepkey_cmd(priv, 0))
+                        IWL_ERROR("Could not send WEP static key.\n");
         }
 
         return 0;
@@ -1180,6 +1184,8 @@ static int iwl4965_clear_sta_key_info(struct iwl_priv *priv, u8 sta_id)
 {
         unsigned long flags;
 
+        priv->key_mapping_key = 0;
+
         spin_lock_irqsave(&priv->sta_lock, flags);
         memset(&priv->stations[sta_id].keyinfo, 0, sizeof(struct iwl4965_hw_key));
         memset(&priv->stations[sta_id].sta.key, 0, sizeof(struct iwl4965_keyinfo));
@@ -1198,6 +1204,8 @@ static int iwl4965_set_dynamic_key(struct iwl_priv *priv,
 {
         int ret;
 
+        priv->key_mapping_key = 1;
+
         switch (key->alg) {
         case ALG_CCMP:
                 ret = iwl4965_set_ccmp_dynamic_key_info(priv, key, sta_id);
@@ -1216,23 +1224,6 @@ static int iwl4965_set_dynamic_key(struct iwl_priv *priv,
         return ret;
 }
 
-static int iwl4965_remove_static_key(struct iwl_priv *priv)
-{
-        int ret = -EOPNOTSUPP;
-
-        return ret;
-}
-
-static int iwl4965_set_static_key(struct iwl_priv *priv,
-                                struct ieee80211_key_conf *key)
-{
-        if (key->alg == ALG_WEP)
-                return -EOPNOTSUPP;
-
-        IWL_ERROR("Static key invalid: alg %d\n", key->alg);
-        return -EINVAL;
-}
-
 static void iwl4965_clear_free_frames(struct iwl_priv *priv)
 {
         struct list_head *element;
@@ -2115,6 +2106,10 @@ static void iwl4965_build_tx_cmd_hwcrypto(struct iwl_priv *priv,
                                       int sta_id)
 {
         struct iwl4965_hw_key *keyinfo = &priv->stations[sta_id].keyinfo;
+        struct iwl_wep_key *wepkey;
+        int keyidx = 0;
+
+        BUG_ON(ctl->key_idx > 3);
 
         switch (keyinfo->alg) {
         case ALG_CCMP:
@@ -2133,16 +2128,24 @@ static void iwl4965_build_tx_cmd_hwcrypto(struct iwl_priv *priv,
                 break;
 
         case ALG_WEP:
-                cmd->cmd.tx.sec_ctl = TX_CMD_SEC_WEP |
-                        (ctl->key_idx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT;
-
-                if (keyinfo->keylen == 13)
-                        cmd->cmd.tx.sec_ctl |= TX_CMD_SEC_KEY128;
+                wepkey = &priv->wep_keys[ctl->key_idx];
+                cmd->cmd.tx.sec_ctl = 0;
+                if (priv->default_wep_key) {
+                        /* the WEP key was sent as static */
+                        keyidx = ctl->key_idx;
+                        memcpy(&cmd->cmd.tx.key[3], wepkey->key,
+                                                        wepkey->key_size);
+                        if (wepkey->key_size == WEP_KEY_LEN_128)
+                                cmd->cmd.tx.sec_ctl |= TX_CMD_SEC_KEY128;
+                } else {
+                        IWL_ERROR("No support for WEP key mappings key\n");
+                }
 
-                memcpy(&cmd->cmd.tx.key[3], keyinfo->key, keyinfo->keylen);
+                cmd->cmd.tx.sec_ctl |= (TX_CMD_SEC_WEP |
+                        (keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
 
                 IWL_DEBUG_TX("Configuring packet for WEP encryption "
-                             "with key %d\n", ctl->key_idx);
+                             "with key %d\n", keyidx);
                 break;
 
         default:
@@ -6989,7 +6992,7 @@ static int iwl4965_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
         DECLARE_MAC_BUF(mac);
         int ret = 0;
         u8 sta_id = IWL_INVALID_STATION;
-        u8 static_key;
+        u8 is_default_wep_key = 0;
 
         IWL_DEBUG_MAC80211("enter\n");
 
@@ -7002,33 +7005,42 @@ static int iwl4965_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                 /* only support pairwise keys */
                 return -EOPNOTSUPP;
 
-        /* FIXME: need to differenciate between static and dynamic key
-         * in the level of mac80211 */
-        static_key = !iwl_is_associated(priv);
+        sta_id = iwl4965_hw_find_station(priv, addr);
+        if (sta_id == IWL_INVALID_STATION) {
+                IWL_DEBUG_MAC80211("leave - %s not in station map.\n",
+                                   print_mac(mac, addr));
+                return -EINVAL;
 
-        if (!static_key) {
-                sta_id = iwl4965_hw_find_station(priv, addr);
-                if (sta_id == IWL_INVALID_STATION) {
-                        IWL_DEBUG_MAC80211("leave - %s not in station map.\n",
-                                           print_mac(mac, addr));
-                        return -EINVAL;
-                }
         }
 
+        mutex_lock(&priv->mutex);
         iwl4965_scan_cancel_timeout(priv, 100);
+        mutex_unlock(&priv->mutex);
+
+        /* If we are getting WEP group key and we didn't receive any key mapping
+         * so far, we are in legacy wep mode (group key only), otherwise we are
+         * in 1X mode.
+         * In legacy wep mode, we use another host command to the uCode */
+        if (key->alg == ALG_WEP && sta_id == priv->hw_setting.bcast_sta_id &&
+                priv->iw_mode != IEEE80211_IF_TYPE_AP) {
+                if (cmd == SET_KEY)
+                        is_default_wep_key = !priv->key_mapping_key;
+                else
+                        is_default_wep_key = priv->default_wep_key;
+        }
 
         switch (cmd) {
         case SET_KEY:
-                if (static_key)
-                        ret = iwl4965_set_static_key(priv, key);
+                if (is_default_wep_key)
+                        ret = iwl_set_default_wep_key(priv, key);
                 else
                         ret = iwl4965_set_dynamic_key(priv, key, sta_id);
 
                 IWL_DEBUG_MAC80211("enable hwcrypto key\n");
                 break;
         case DISABLE_KEY:
-                if (static_key)
-                        ret = iwl4965_remove_static_key(priv);
+                if (is_default_wep_key)
+                        ret = iwl_remove_default_wep_key(priv, key);
                 else
                         ret = iwl4965_clear_sta_key_info(priv, sta_id);