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mac80211: support GTK rekey offload

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This adds the necessary mac80211 APIs to support
GTK rekey offload, mirroring the functionality
from cfg80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-07-05 16:35:41 +02:00 committed by John W. Linville
parent e5497d766a
commit c68f4b892c
5 changed files with 107 additions and 0 deletions
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20
include/net/mac80211.h
View File

@ -1700,6 +1700,12 @@ enum ieee80211_ampdu_mlme_action {
* which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
* The callback must be atomic.
*
* @set_rekey_data: If the device supports GTK rekeying, for example while the
* host is suspended, it can assign this callback to retrieve the data
* necessary to do GTK rekeying, this is the KEK, KCK and replay counter.
* After rekeying was done it should (for example during resume) notify
* userspace of the new replay counter using ieee80211_gtk_rekey_notify().
*
* @hw_scan: Ask the hardware to service the scan request, no need to start
* the scan state machine in stack. The scan must honour the channel
* configuration done by the regulatory agent in the wiphy's
@ -1912,6 +1918,9 @@ struct ieee80211_ops {
struct ieee80211_key_conf *conf,
struct ieee80211_sta *sta,
u32 iv32, u16 *phase1key);
void (*set_rekey_data)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct cfg80211_gtk_rekey_data *data);
int (*hw_scan)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct cfg80211_scan_request *req);
void (*cancel_hw_scan)(struct ieee80211_hw *hw,
@ -2585,6 +2594,17 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
struct sk_buff *skb,
enum ieee80211_tkip_key_type type, u8 *key);
/**
* ieee80211_gtk_rekey_notify - notify userspace supplicant of rekeying
* @vif: virtual interface the rekeying was done on
* @bssid: The BSSID of the AP, for checking association
* @replay_ctr: the new replay counter after GTK rekeying
* @gfp: allocation flags
*/
void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
const u8 *replay_ctr, gfp_t gfp);
/**
* ieee80211_wake_queue - wake specific queue
* @hw: pointer as obtained from ieee80211_alloc_hw().

16
net/mac80211/cfg.c
View File

@ -2101,6 +2101,21 @@ static void ieee80211_get_ringparam(struct wiphy *wiphy,
drv_get_ringparam(local, tx, tx_max, rx, rx_max);
}
static int ieee80211_set_rekey_data(struct wiphy *wiphy,
struct net_device *dev,
struct cfg80211_gtk_rekey_data *data)
{
struct ieee80211_local *local = wiphy_priv(wiphy);
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (!local->ops->set_rekey_data)
return -EOPNOTSUPP;
drv_set_rekey_data(local, sdata, data);
return 0;
}
struct cfg80211_ops mac80211_config_ops = {
.add_virtual_intf = ieee80211_add_iface,
.del_virtual_intf = ieee80211_del_iface,
@ -2163,4 +2178,5 @@ struct cfg80211_ops mac80211_config_ops = {
.get_antenna = ieee80211_get_antenna,
.set_ringparam = ieee80211_set_ringparam,
.get_ringparam = ieee80211_get_ringparam,
.set_rekey_data = ieee80211_set_rekey_data,
};

10
net/mac80211/driver-ops.h
View File

@ -647,4 +647,14 @@ static inline int drv_set_bitrate_mask(struct ieee80211_local *local,
return ret;
}
static inline void drv_set_rekey_data(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct cfg80211_gtk_rekey_data *data)
{
trace_drv_set_rekey_data(local, sdata, data);
if (local->ops->set_rekey_data)
local->ops->set_rekey_data(&local->hw, &sdata->vif, data);
trace_drv_return_void(local);
}
#endif /* __MAC80211_DRIVER_OPS */

49
net/mac80211/driver-trace.h
View File

@ -1024,6 +1024,34 @@ TRACE_EVENT(drv_set_bitrate_mask,
)
);
TRACE_EVENT(drv_set_rekey_data,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct cfg80211_gtk_rekey_data *data),
TP_ARGS(local, sdata, data),
TP_STRUCT__entry(
LOCAL_ENTRY
VIF_ENTRY
__array(u8, kek, NL80211_KEK_LEN)
__array(u8, kck, NL80211_KCK_LEN)
__array(u8, replay_ctr, NL80211_REPLAY_CTR_LEN)
),
TP_fast_assign(
LOCAL_ASSIGN;
VIF_ASSIGN;
memcpy(__entry->kek, data->kek, NL80211_KEK_LEN);
memcpy(__entry->kck, data->kck, NL80211_KCK_LEN);
memcpy(__entry->replay_ctr, data->replay_ctr,
NL80211_REPLAY_CTR_LEN);
),
TP_printk(LOCAL_PR_FMT VIF_PR_FMT,
LOCAL_PR_ARG, VIF_PR_ARG)
);
/*
* Tracing for API calls that drivers call.
*/
@ -1293,6 +1321,27 @@ DEFINE_EVENT(local_only_evt, api_remain_on_channel_expired,
TP_ARGS(local)
);
TRACE_EVENT(api_gtk_rekey_notify,
TP_PROTO(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, const u8 *replay_ctr),
TP_ARGS(sdata, bssid, replay_ctr),
TP_STRUCT__entry(
VIF_ENTRY
__array(u8, bssid, ETH_ALEN)
__array(u8, replay_ctr, NL80211_REPLAY_CTR_LEN)
),
TP_fast_assign(
VIF_ASSIGN;
memcpy(__entry->bssid, bssid, ETH_ALEN);
memcpy(__entry->replay_ctr, replay_ctr, NL80211_REPLAY_CTR_LEN);
),
TP_printk(VIF_PR_FMT, VIF_PR_ARG)
);
/*
* Tracing for internal functions
* (which may also be called in response to driver calls)

12
net/mac80211/key.c
View File

@ -613,3 +613,15 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
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);