From b0194fe07ed6afa84587f9c2dbaedfe4f8e0d45c Mon Sep 17 00:00:00 2001
From: Jouni Malinen <j@w1.fi>
Date: Wed, 27 Feb 2008 17:54:06 -0800
Subject: [PATCH] Added max_listen_interval configuration option

This allows associations to be denied if the STA tries to use too large
listen interval. The default value is 65535 which matches with the field
size limits.
---
 hostapd/config.c             |  4 ++++
 hostapd/config.h             |  7 +++++++
 hostapd/hostapd.conf         |  3 +++
 hostapd/ieee802_11.c         |  9 +++++++++
 src/common/ieee802_11_defs.h | 11 ++++++++---
 5 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/hostapd/config.c b/hostapd/config.c
index 428045350..57fbb750f 100644
--- a/hostapd/config.c
+++ b/hostapd/config.c
@@ -178,6 +178,8 @@ static void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
 	bss->radius_server_auth_port = 1812;
 	bss->ap_max_inactivity = AP_MAX_INACTIVITY;
 	bss->eapol_version = EAPOL_VERSION;
+
+	bss->max_listen_interval = 65535;
 }
 
 
@@ -1927,6 +1929,8 @@ struct hostapd_config * hostapd_config_read(const char *fname)
 		} else if (os_strcmp(buf, "ieee80211w") == 0) {
 			bss->ieee80211w = atoi(pos);
 #endif /* CONFIG_IEEE80211W */
+		} else if (os_strcmp(buf, "max_listen_interval") == 0) {
+			bss->max_listen_interval = atoi(pos);
 		} else {
 			printf("Line %d: unknown configuration item '%s'\n",
 			       line, buf);
diff --git a/hostapd/config.h b/hostapd/config.h
index 8f7777e28..4a7b24b3a 100644
--- a/hostapd/config.h
+++ b/hostapd/config.h
@@ -262,6 +262,13 @@ struct hostapd_bss_config {
 	struct hostapd_vlan *vlan, *vlan_tail;
 
 	macaddr bssid;
+
+	/*
+	 * Maximum listen interval that STAs can use when associating with this
+	 * BSS. If a STA tries to use larger value, the association will be
+	 * denied with status code 51.
+	 */
+	u16 max_listen_interval;
 };
 
 
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 539da4524..3c9fc6557 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -371,6 +371,9 @@ wme_ac_vo_acm=0
 # default: do not control from hostapd (80211.o defaults to 1=enabled)
 #bridge_packets=1
 
+# Maximum allowed Listen Interval (how many Beacon periods STAs are allowed to
+# remain asleep). Default: 65535 (no limit apart from field size)
+#max_listen_interval=100
 
 ##### IEEE 802.1X-2004 related configuration ##################################
 
diff --git a/hostapd/ieee802_11.c b/hostapd/ieee802_11.c
index e9a674f09..388b19d03 100644
--- a/hostapd/ieee802_11.c
+++ b/hostapd/ieee802_11.c
@@ -855,6 +855,15 @@ static void handle_assoc(struct hostapd_data *hapd,
 		goto fail;
 	}
 
+	if (listen_interval > hapd->conf->max_listen_interval) {
+		hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+			       HOSTAPD_LEVEL_DEBUG,
+			       "Too large Listen Interval (%d)",
+			       listen_interval);
+		resp = WLAN_STATUS_ASSOC_DENIED_LISTEN_INT_TOO_LARGE;
+		goto fail;
+	}
+
 	if (reassoc) {
 		os_memcpy(sta->previous_ap, mgmt->u.reassoc_req.current_ap,
 			  ETH_ALEN);
diff --git a/src/common/ieee802_11_defs.h b/src/common/ieee802_11_defs.h
index 82902174e..f7c47d982 100644
--- a/src/common/ieee802_11_defs.h
+++ b/src/common/ieee802_11_defs.h
@@ -112,9 +112,9 @@
 #define WLAN_STATUS_PWR_CAPABILITY_NOT_VALID 23
 #define WLAN_STATUS_SUPPORTED_CHANNEL_NOT_VALID 24
 /* 802.11g */
-#define WLAN_STATUS_ASSOC_DENOED_NO_SHORT_SLOT_TIME 25
-#define WLAN_STATUS_ASSOC_DENOED_NO_ER_PBCC 26
-#define WLAN_STATUS_ASSOC_DENOED_NO_DSSS_OFDM 27
+#define WLAN_STATUS_ASSOC_DENIED_NO_SHORT_SLOT_TIME 25
+#define WLAN_STATUS_ASSOC_DENIED_NO_ER_PBCC 26
+#define WLAN_STATUS_ASSOC_DENIED_NO_DSSS_OFDM 27
 /* IEEE 802.11i */
 #define WLAN_STATUS_INVALID_IE 40
 #define WLAN_STATUS_GROUP_CIPHER_NOT_VALID 41
@@ -123,6 +123,11 @@
 #define WLAN_STATUS_UNSUPPORTED_RSN_IE_VERSION 44
 #define WLAN_STATUS_INVALID_RSN_IE_CAPAB 45
 #define WLAN_STATUS_CIPHER_REJECTED_PER_POLICY 46
+#define WLAN_STATUS_TS_NOT_CREATED 47
+#define WLAN_STATUS_DIRECT_LINK_NOT_ALLOWED 48
+#define WLAN_STATUS_DEST_STA_NOT_PRESENT 49
+#define WLAN_STATUS_DEST_STA_NOT_QOS_STA 50
+#define WLAN_STATUS_ASSOC_DENIED_LISTEN_INT_TOO_LARGE 51
 /* IEEE 802.11r */
 #define WLAN_STATUS_INVALID_FT_ACTION_FRAME_COUNT 52
 #define WLAN_STATUS_EXPECTED_RESOURCE_REQ_FT 53