cfg80211: rework key operation

This reworks the key operation in cfg80211, and now only
allows, from userspace, configuring keys (via nl80211)
after the connection has been established (in managed
mode), the IBSS been joined (in IBSS mode), at any time
(in AP[_VLAN] modes) or never for all the other modes.

In order to do shared key authentication correctly, it
is now possible to give a WEP key to the AUTH command.
To configure static WEP keys, these are given to the
CONNECT or IBSS_JOIN command directly, for a userspace
SME it is assumed it will configure it properly after
the connection has been established.

Since mac80211 used to check the default key in IBSS
mode to see whether or not the network is protected,
it needs an update in that area, as well as an update
to make use of the WEP key passed to auth() for shared
key authentication.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 3 deletions

diff --git a/net/wireless/mlme.c b/net/wireless/mlme.c
index 1b2ca1fea7a..8e4ce2fdf86 100644
--- a/net/wireless/mlme.c
+++ b/net/wireless/mlme.c
@@ -328,7 +328,8 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 			 enum nl80211_auth_type auth_type,
 			 const u8 *bssid,
 			 const u8 *ssid, int ssid_len,
-			 const u8 *ie, int ie_len)
+			 const u8 *ie, int ie_len,
+			 const u8 *key, int key_len, int key_idx)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_auth_request req;
@@ -337,6 +338,10 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 
 	ASSERT_WDEV_LOCK(wdev);
 
+	if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
+		if (!key || !key_len || key_idx < 0 || key_idx > 4)
+			return -EINVAL;
+
 	if (wdev->current_bss &&
 	    memcmp(bssid, wdev->current_bss->pub.bssid, ETH_ALEN) == 0)
 		return -EALREADY;
@@ -359,6 +364,9 @@ int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 	req.auth_type = auth_type;
 	req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
 				   WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
+	req.key = key;
+	req.key_len = key_len;
+	req.key_idx = key_idx;
 	if (!req.bss)
 		return -ENOENT;
 
@@ -396,13 +404,15 @@ int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
 		       struct net_device *dev, struct ieee80211_channel *chan,
 		       enum nl80211_auth_type auth_type, const u8 *bssid,
 		       const u8 *ssid, int ssid_len,
-		       const u8 *ie, int ie_len)
+		       const u8 *ie, int ie_len,
+		       const u8 *key, int key_len, int key_idx)
 {
 	int err;
 
 	wdev_lock(dev->ieee80211_ptr);
 	err = __cfg80211_mlme_auth(rdev, dev, chan, auth_type, bssid,
-				   ssid, ssid_len, ie, ie_len);
+				   ssid, ssid_len, ie, ie_len,
+				   key, key_len, key_idx);
 	wdev_unlock(dev->ieee80211_ptr);
 
 	return err;