hostapd: backport fix for wnm_sleep_mode=0

wpa_disable_eapol_key_retries can't prevent attacks against the Wireless
Network Management (WNM) Sleep Mode handshake. Currently, hostapd
processes WNM Sleep Mode requests from clients regardless of the setting
wnm_sleep_mode. Backport Jouni Malinen's upstream patch 114f2830 in
order to ignore such requests by clients when wnm_sleep_mode is disabled
(which is the default).

Signed-off-by: Timo Sigurdsson <public_timo.s@silentcreek.de>
[rewrite commit subject (<= 50 characters), bump PKG_RELEASE]
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

package/network/services/hostapd/Makefile

@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=hostapd
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE_URL:=http://w1.fi/hostap.git
 PKG_SOURCE_PROTO:=git

package/network/services/hostapd/patches/013-WNM-Ignore-WNM-Sleep-Mode-Request-in-wnm_sleep_mode-.patch

@@ -0,0 +1,35 @@
+From 114f2830d2c2aee6db23d48240e93415a256a37c Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <jouni@qca.qualcomm.com>
+Date: Fri, 20 Oct 2017 17:39:42 +0300
+Subject: [PATCH] WNM: Ignore WNM-Sleep Mode Request in wnm_sleep_mode=0 case
+
+The hostapd wnm_sleep_mode parameter was previously used to control
+advertisement of WNM-Sleep Mode support, but it was not used when
+processing a request to use WNM-Sleep Mode. Add an explicit check during
+request processing as well so that any misbehaving station is ignored.
+
+Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
+---
+ src/ap/wnm_ap.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/ap/wnm_ap.c b/src/ap/wnm_ap.c
+index 7c4fde0..973e4d3 100644
+--- a/src/ap/wnm_ap.c
++++ b/src/ap/wnm_ap.c
+@@ -200,6 +200,13 @@ static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd,
+ 	u8 *tfsreq_ie_end = NULL;
+ 	u16 tfsreq_ie_len = 0;
+ 
++	if (!hapd->conf->wnm_sleep_mode) {
++		wpa_printf(MSG_DEBUG, "Ignore WNM-Sleep Mode Request from "
++			   MACSTR " since WNM-Sleep Mode is disabled",
++			   MAC2STR(addr));
++		return;
++	}
++
+ 	dialog_token = *pos++;
+ 	while (pos + 1 < frm + len) {
+ 		u8 ie_len = pos[1];
+-- 
+2.1.4