hostapd: disable support for Wired Equivalent Privacy by default

Upstream in commit 200c7693c9a1 ("Make WEP functionality an optional
build parameter") has made WEP functionality an optional build parameter
disabled as default, because WEP should not be used for anything
anymore. As a step towards removing it completely, they moved all WEP
related functionality behind CONFIG_WEP blocks and disabled it by
default.

This functionality is subject to be completely removed in a future
release.

So follow this good security advice, deprecation notice and disable WEP
by default, but still allow custom builds with WEP support via
CONFIG_WPA_ENABLE_WEP config option till upstream removes support for
WEP completely.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/network/services/hostapd/Config.in

@@ -73,3 +73,12 @@ config DRIVER_11AC_SUPPORT
 config DRIVER_11W_SUPPORT
 	bool
 	default n
+
+config WPA_ENABLE_WEP
+	bool "Enable support for unsecure and obsolete WEP"
+	help
+	  Wired equivalent privacy (WEP) is an obsolete cryptographic data
+	  confidentiality algorithm that is not considered secure. It should not be used
+	  for anything anymore. The functionality needed to use WEP is available in the
+	  current hostapd release under this optional build parameter and completely
+	  removed in a future release.

package/network/services/hostapd/Makefile

@@ -32,6 +32,7 @@ PKG_CONFIG_DEPENDS:= \
 	CONFIG_DRIVER_WEXT_SUPPORT \
 	CONFIG_DRIVER_11N_SUPPORT \
 	CONFIG_DRIVER_11AC_SUPPORT \
+	CONFIG_WPA_ENABLE_WEP
 
 EAPOL_TEST_PROVIDERS:=eapol-test eapol-test-openssl eapol-test-wolfssl
 
@@ -445,6 +446,10 @@ ifdef CONFIG_PACKAGE_kmod-cfg80211
   TARGET_LDFLAGS += -lm -lnl-tiny
 endif
 
+ifdef CONFIG_WPA_ENABLE_WEP
+    DRIVER_MAKEOPTS += CONFIG_WEP=y
+endif
+
 define Build/RunMake
 	CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
 	$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR)/$(1) \