1 files changed, 241 insertions, 2 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 843d1577f00f..178f00cf61b9 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -2,25 +2,198 @@
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
  *
  * 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 <net/mac80211.h>
 #include "ieee80211_i.h"
 #include "debugfs_key.h"
 #include "aes_ccm.h"
 
+
+/*
+ * 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 each key
+ * that is eligible the hardware is asked to enable that key but if
+ * it cannot do that they key is simply kept for software encryption.
+ * There is currently no way of knowing this except by looking into
+ * debugfs.
+ *
+ * All operations here are called under RTNL so no extra locking is
+ * required.
+ */
+
+static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+static const u8 zero_addr[ETH_ALEN];
+
+static const u8 *get_mac_for_key(struct ieee80211_key *key)
+{
+        const u8 *addr = bcast_addr;
+
+        /*
+         * If we're an AP we won't ever receive frames with a non-WEP
+         * group key so we tell the driver that by using the zero MAC
+         * address to indicate a transmit-only key.
+         */
+        if (key->conf.alg != ALG_WEP &&
+            (key->sdata->type == IEEE80211_IF_TYPE_AP ||
+             key->sdata->type == IEEE80211_IF_TYPE_VLAN))
+                addr = zero_addr;
+
+        if (key->sta)
+                addr = key->sta->addr;
+
+        return addr;
+}
+
+static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
+{
+        const u8 *addr;
+        int ret;
+
+        if (!key->local->ops->set_key)
+                return;
+
+        addr = get_mac_for_key(key);
+
+        ret = key->local->ops->set_key(local_to_hw(key->local), SET_KEY,
+                                       key->sdata->dev->dev_addr, addr,
+                                       &key->conf);
+
+        WARN_ON(!ret && (key->conf.hw_key_idx == HW_KEY_IDX_INVALID));
+
+        if (!ret)
+                key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
+
+        if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP)
+                printk(KERN_ERR "mac80211-%s: failed to set key "
+                       "(%d, " MAC_FMT ") to hardware (%d)\n",
+                       wiphy_name(key->local->hw.wiphy),
+                       key->conf.keyidx, MAC_ARG(addr), ret);
+}
+
+static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
+{
+        const u8 *addr;
+        int ret;
+
+        if (!key->local->ops->set_key)
+                return;
+
+        if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+                return;
+
+        addr = get_mac_for_key(key);
+
+        ret = key->local->ops->set_key(local_to_hw(key->local), DISABLE_KEY,
+                                       key->sdata->dev->dev_addr, addr,
+                                       &key->conf);
+
+        if (ret)
+                printk(KERN_ERR "mac80211-%s: failed to remove key "
+                       "(%d, " MAC_FMT ") from hardware (%d)\n",
+                       wiphy_name(key->local->hw.wiphy),
+                       key->conf.keyidx, MAC_ARG(addr), ret);
+
+        key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
+        key->conf.hw_key_idx = HW_KEY_IDX_INVALID;
+}
+
 struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
-                                          int idx, size_t key_len, gfp_t flags)
+                                          struct sta_info *sta,
+                                          ieee80211_key_alg alg,
+                                          int idx,
+                                          size_t key_len,
+                                          const u8 *key_data)
 {
         struct ieee80211_key *key;
 
-        key = kzalloc(sizeof(struct ieee80211_key) + key_len, flags);
+        BUG_ON(alg == ALG_NONE);
+
+        key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL);
         if (!key)
                 return NULL;
+
+        /*
+         * Default to software encryption; we'll later upload the
+         * key to the hardware if possible.
+         */
+        key->conf.hw_key_idx = HW_KEY_IDX_INVALID;
+        key->conf.flags = 0;
+        key->flags = 0;
+
+        key->conf.alg = alg;
+        key->conf.keyidx = idx;
+        key->conf.keylen = key_len;
+        memcpy(key->conf.key, key_data, key_len);
+
+        key->local = sdata->local;
+        key->sdata = sdata;
+        key->sta = sta;
+
+        if (alg == ALG_CCMP) {
+                /*
+                 * 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);
+                if (!key->u.ccmp.tfm) {
+                        ieee80211_key_free(key);
+                        return NULL;
+                }
+        }
+
+        ieee80211_debugfs_key_add(key->local, key);
+
+        if (sta) {
+                ieee80211_debugfs_key_sta_link(key, sta);
+                sta->key = key;
+                /*
+                 * some hardware cannot handle TKIP with QoS, so
+                 * we indicate whether QoS could be in use.
+                 */
+                if (sta->flags & WLAN_STA_WME)
+                        key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA;
+        } else {
+                if (sdata->type == IEEE80211_IF_TYPE_STA) {
+                        struct sta_info *ap;
+
+                        /* same here, the AP could be using QoS */
+                        ap = sta_info_get(key->local, key->sdata->u.sta.bssid);
+                        if (ap) {
+                                if (ap->flags & WLAN_STA_WME)
+                                        key->conf.flags |=
+                                                IEEE80211_KEY_FLAG_WMM_STA;
+                                sta_info_put(ap);
+                        }
+                }
+
+                if (idx >= 0 && idx < NUM_DEFAULT_KEYS) {
+                        if (!sdata->keys[idx])
+                                sdata->keys[idx] = key;
+                        else
+                                WARN_ON(1);
+                } else
+                        WARN_ON(1);
+        }
+
+        list_add(&key->list, &sdata->key_list);
+
+        if (netif_running(key->sdata->dev))
+                ieee80211_key_enable_hw_accel(key);
+
         return key;
 }
 
@@ -29,8 +202,74 @@ void ieee80211_key_free(struct ieee80211_key *key)
         if (!key)
                 return;
 
+        ieee80211_key_disable_hw_accel(key);
+
+        if (key->sta) {
+                key->sta->key = NULL;
+        } else {
+                if (key->sdata->default_key == key)
+                        ieee80211_set_default_key(key->sdata, -1);
+                if (key->conf.keyidx >= 0 &&
+                    key->conf.keyidx < NUM_DEFAULT_KEYS)
+                        key->sdata->keys[key->conf.keyidx] = NULL;
+                else
+                        WARN_ON(1);
+        }
+
         if (key->conf.alg == ALG_CCMP)
                 ieee80211_aes_key_free(key->u.ccmp.tfm);
         ieee80211_debugfs_key_remove(key);
+
+        list_del(&key->list);
+
         kfree(key);
 }
+
+void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx)
+{
+        struct ieee80211_key *key = NULL;
+
+        if (idx >= 0 && idx < NUM_DEFAULT_KEYS)
+                key = sdata->keys[idx];
+
+        if (sdata->default_key != key) {
+                ieee80211_debugfs_key_remove_default(sdata);
+
+                sdata->default_key = key;
+
+                if (sdata->default_key)
+                        ieee80211_debugfs_key_add_default(sdata);
+
+                if (sdata->local->ops->set_key_idx)
+                        sdata->local->ops->set_key_idx(
+                                local_to_hw(sdata->local), idx);
+        }
+}
+
+void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
+{
+        struct ieee80211_key *key, *tmp;
+
+        list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
+                ieee80211_key_free(key);
+}
+
+void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
+{
+        struct ieee80211_key *key;
+
+        WARN_ON(!netif_running(sdata->dev));
+        if (!netif_running(sdata->dev))
+                return;
+
+        list_for_each_entry(key, &sdata->key_list, list)
+                ieee80211_key_enable_hw_accel(key);
+}
+
+void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata)
+{
+        struct ieee80211_key *key;
+
+        list_for_each_entry(key, &sdata->key_list, list)
+                ieee80211_key_disable_hw_accel(key);
+}