Increase initial group key handshake retransmit timeout to 500 ms

The 100 ms timeout on retransmitting group key message can be too short
for stations that are in power save mode or if there is a large number
of association stations. While the retransmission of the EAPOL-Key frame
should allow this to be recovered from, it is useful to avoid
unnecessary frames to save soem CPU and power.

Signed-hostap: Jouni Malinen <j@w1.fi>

src/ap/wpa_auth.c

@@ -1,6 +1,6 @@
 /*
- * hostapd - IEEE 802.11i-2004 / WPA Authenticator
- * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
+ * IEEE 802.11 RSN / WPA Authenticator
+ * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi>
  *
  * 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
@@ -52,6 +52,7 @@ static const u32 dot11RSNAConfigGroupUpdateCount = 4;
 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
 static const u32 eapol_key_timeout_first = 100; /* ms */
 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
+static const u32 eapol_key_timeout_first_group = 500; /* ms */
 
 /* TODO: make these configurable */
 static const int dot11RSNAConfigPMKLifetime = 43200;
@@ -1336,7 +1337,8 @@ static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
 
 	ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
 	if (ctr == 1 && wpa_auth->conf.tx_status)
-		timeout_ms = eapol_key_timeout_first;
+		timeout_ms = pairwise ? eapol_key_timeout_first :
+			eapol_key_timeout_first_group;
 	else
 		timeout_ms = eapol_key_timeout_subseq;
 	if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))