+++ /dev/null
-/*
- * 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 <linux/rcupdate.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->vif.type == IEEE80211_IF_TYPE_AP ||
- key->sdata->vif.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;
- DECLARE_MAC_BUF(mac);
-
- 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);
-
- 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, %s) to hardware (%d)\n",
- wiphy_name(key->local->hw.wiphy),
- key->conf.keyidx, print_mac(mac, addr), ret);
-}
-
-static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
-{
- const u8 *addr;
- int ret;
- DECLARE_MAC_BUF(mac);
-
- 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, %s) from hardware (%d)\n",
- wiphy_name(key->local->hw.wiphy),
- key->conf.keyidx, print_mac(mac, addr), ret);
-
- key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
-}
-
-struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata,
- struct sta_info *sta,
- enum ieee80211_key_alg alg,
- int idx,
- size_t key_len,
- const u8 *key_data)
-{
- struct ieee80211_key *key;
-
- BUG_ON(idx < 0 || idx >= NUM_DEFAULT_KEYS);
-
- 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.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);
-
- /* remove key first */
- if (sta)
- ieee80211_key_free(sta->key);
- else
- ieee80211_key_free(sdata->keys[idx]);
-
- if (sta) {
- ieee80211_debugfs_key_sta_link(key, sta);
-
- /*
- * 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->vif.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);
- }
- }
- }
-
- /* enable hwaccel if appropriate */
- if (netif_running(key->sdata->dev))
- ieee80211_key_enable_hw_accel(key);
-
- if (sta)
- rcu_assign_pointer(sta->key, key);
- else
- rcu_assign_pointer(sdata->keys[idx], key);
-
- list_add(&key->list, &sdata->key_list);
-
- return key;
-}
-
-void ieee80211_key_free(struct ieee80211_key *key)
-{
- if (!key)
- return;
-
- if (key->sta) {
- rcu_assign_pointer(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)
- rcu_assign_pointer(key->sdata->keys[key->conf.keyidx],
- NULL);
- else
- WARN_ON(1);
- }
-
- /* wait for all key users to complete */
- synchronize_rcu();
-
- /* remove from hwaccel if appropriate */
- ieee80211_key_disable_hw_accel(key);
-
- 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);
-
- rcu_assign_pointer(sdata->default_key, key);
-
- if (sdata->default_key)
- ieee80211_debugfs_key_add_default(sdata);
- }
-}
-
-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);
-}
projects / openwrt.git / blobdiff