hostap: Add build support for Zephyr

Only adds basic build support using Zephyr. Crypto support is disabled
till the MbedTLS integration is complete.

Signed-off-by: Sridhar Nuvusetty <sridhar.nuvusetty@nordicsemi.no>
Signed-off-by: Sachin Kulkarni <sachin.kulkarni@nordicsemi.no>
Signed-off-by: Ravi Dondaputi <ravi.dondaputi@nordicsemi.no>
Signed-off-by: Krishna T <krishna.t@nordicsemi.no>

MAINTAINERS.yml

@@ -3608,6 +3608,16 @@ West:
   labels:
     - "area: Sensors"
 
+"West project: hostap":
+  status: maintained
+  maintainers:
+    - krish2718
+    - jukkar
+  files:
+    - modules/hostap/
+  labels:
+    - "area: Wi-Fi"
+
 Xtensa arch:
   status: maintained
   maintainers:

modules/Kconfig

@@ -43,6 +43,7 @@ source "modules/Kconfig.xtensa"
 source "modules/zcbor/Kconfig"
 source "modules/Kconfig.mcuboot"
 source "modules/Kconfig.intel"
+source "modules/hostap/Kconfig"
 
 comment "Unavailable modules, please install those via the project manifest."
 

modules/hostap/CMakeLists.txt

@@ -0,0 +1,84 @@
+#
+# Copyright (c) 2023 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if(CONFIG_WIFI_NM_WPA_SUPPLICANT)
+
+zephyr_library()
+
+set(HOSTAP_BASE ${ZEPHYR_HOSTAP_MODULE_DIR})
+set(WIFI_NM_WPA_SUPPLICANT_BASE ${HOSTAP_BASE}/wpa_supplicant)
+set(HOSTAP_SRC_BASE ${HOSTAP_BASE}/src)
+
+set(CMAKE_EXE_LINKER_FLAGS "--specs=nosys.specs -lnosys")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMISSING_SYSCALL_NAMES")
+
+zephyr_compile_definitions(
+	CONFIG_ZEPHYR
+)
+
+zephyr_include_directories(
+	${HOSTAP_BASE}/
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/
+	${HOSTAP_SRC_BASE}/
+)
+
+zephyr_library_compile_definitions(
+	TLS_DEFAULT_CIPHERS=\""DEFAULT:!EXP:!LOW"\"
+	CONFIG_SME
+	CONFIG_NO_CONFIG_WRITE
+	CONFIG_NO_CONFIG_BLOBS
+	CONFIG_CTRL_IFACE
+	CONFIG_NO_RANDOM_POOL
+	CONFIG_NO_WPA
+	CONFIG_NO_PBKDF2
+	)
+
+zephyr_library_include_directories(
+	${CMAKE_CURRENT_SOURCE_DIR}/src
+	${HOSTAP_BASE}/
+	${HOSTAP_SRC_BASE}/utils
+	${HOSTAP_SRC_BASE}/drivers
+	${HOSTAP_BASE}/src
+	${ZEPHYR_BASE}/include
+	${ZEPHYR_BASE}/include/net
+)
+
+zephyr_library_sources(
+	${HOSTAP_SRC_BASE}/common/wpa_common.c
+	${HOSTAP_SRC_BASE}/common/ieee802_11_common.c
+	${HOSTAP_SRC_BASE}/common/hw_features_common.c
+	${HOSTAP_SRC_BASE}/common/wpa_ctrl.c
+	${HOSTAP_SRC_BASE}/common/cli.c
+
+	${HOSTAP_SRC_BASE}/drivers/driver_common.c
+	${HOSTAP_SRC_BASE}/drivers/drivers.c
+	${HOSTAP_SRC_BASE}/utils/base64.c
+	${HOSTAP_SRC_BASE}/utils/common.c
+	${HOSTAP_SRC_BASE}/utils/wpabuf.c
+	${HOSTAP_SRC_BASE}/utils/bitfield.c
+	${HOSTAP_SRC_BASE}/utils/eloop.c
+	${HOSTAP_SRC_BASE}/utils/os_zephyr.c
+	${HOSTAP_SRC_BASE}/utils/wpa_debug_zephyr.c
+	${HOSTAP_SRC_BASE}/crypto/crypto_none.c
+	${HOSTAP_SRC_BASE}/crypto/tls_none.c
+
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/config.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/notify.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/eap_register.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/op_classes.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/rrm.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/wmm_ac.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/config_none.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/bssid_ignore.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/wpas_glue.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/scan.c
+	${WIFI_NM_WPA_SUPPLICANT_BASE}/ctrl_iface.c
+
+	# Zephyr specific files (glue code)
+	# TBD
+)
+
+endif()

modules/hostap/Kconfig

@@ -0,0 +1,104 @@
+# WPA Supplicant configuration options
+#
+# Copyright (c) 2023 Nordic Semiconductor
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config WIFI_NM_WPA_SUPPLICANT
+	bool "WPA Suplicant from hostap project [EXPERIMENTAL]"
+	select POSIX_CLOCK
+	select NET_SOCKETS
+	select NET_SOCKETS_PACKET
+	select NET_SOCKETPAIR
+	select NET_L2_WIFI_MGMT
+	select WIFI_NM
+	select EXPERIMENTAL
+	help
+	  WPA supplicant as a network management backend for WIFI_NM.
+
+config WIFI_NM_WPA_SUPPLICANT_THREAD_STACK_SIZE
+	int "Stack size for wpa_supplicant thread"
+	default 8192
+
+config NET_SOCKETPAIR_BUFFER_SIZE
+	default 4096
+
+config POSIX_MAX_FDS
+	# l2_packet - 1
+	# ctrl_iface - 2 * socketpairs = 4(local and global)
+	# z_wpa_event_sock - 1 socketpair = 2
+	# Remaining left for the applications running in default configuration
+	default 16 if !POSIX_API
+
+# Control interface is stack heavy (buffers + snprintfs)
+# Making calls to RPU from net_mgmt callbacks (status - RSSI)
+config NET_MGMT_EVENT_STACK_SIZE
+	default 4096
+
+config NET_SOCKETS_POLL_MAX
+	default 6
+
+
+# Supplicant API is stack heavy (buffers + snprintfs) and control interface
+# uses socketpair which pushes the stack usage causing overflow for 2048 bytes.
+config SYSTEM_WORKQUEUE_STACK_SIZE
+	default 2560
+
+module = WIFI_NM_WPA_SUPPLICANT
+module-str = WPA supplicant
+source "subsys/logging/Kconfig.template.log_config"
+
+config WIFI_NM_WPA_SUPPLICANT_DEBUG_LEVEL
+	int "Min compiled-in debug message level for WPA supplicant"
+	default 0 if WIFI_NM_WPA_SUPPLICANT_LOG_LEVEL_DBG # MSG_EXCESSIVE
+	default 3 if WIFI_NM_WPA_SUPPLICANT_LOG_LEVEL_INF # MSG_INFO
+	default 4 if WIFI_NM_WPA_SUPPLICANT_LOG_LEVEL_WRN # MSG_WARNING
+	default 5 if WIFI_NM_WPA_SUPPLICANT_LOG_LEVEL_ERR # MSG_ERROR
+	default 6
+	help
+	  Minimum priority level of a debug message emitted by WPA supplicant that
+	  is compiled-in the firmware. See wpa_debug.h file of the supplicant for
+	  available levels and functions for emitting the messages. Note that
+	  runtime filtering can also be configured in addition to the compile-time
+	  filtering.
+
+if WIFI_NM_WPA_SUPPLICANT
+
+# Create hidden config options that are used in hostap. This way we do not need
+# to mark them as allowed for CI checks, and also someone else cannot use the
+# same name options.
+
+config SME
+	bool
+	default y
+
+config NO_CONFIG_WRITE
+	bool
+	default y
+
+config NO_CONFIG_BLOBS
+	bool
+	default y
+
+config CTRL_IFACE
+	bool
+	default y
+
+config NO_RANDOM_POOL
+	bool
+	default y
+
+config NO_WPA
+	bool
+	default y
+
+config NO_PBKDF2
+	bool
+	default y
+
+config ZEPHYR
+	bool
+	default y
+
+endif # WIFI_NM_WPA_SUPPLICANT