ksmbd: add out-of-tree module

ksmbd is an upstream linux alternative to Samba which is lighterweight
and more performant, especially on underpowered devices.

Moving it here from the packages feed as it is now an upstream kernel
module. Also easier to update as version updates can be coordinated better

The next LTS kernel (5.15) has this included. A depend on kernel < 5.15
will need to be added later.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/kernel/ksmbd/Makefile

+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=ksmbd
+PKG_VERSION:=3.4.3
+PKG_RELEASE:=$(AUTORELEASE)
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/cifsd-team/cifsd/tar.gz/$(PKG_VERSION)?
+PKG_HASH:=a910c55d9e6924775e00504eddd00b49788603af29d0772cb9fb6722c189f628
+
+PKG_LICENSE:=GPL-2.0-or-later
+PKG_LICENSE_FILES:=COPYING
+
+include $(INCLUDE_DIR)/kernel.mk
+include $(INCLUDE_DIR)/package.mk
+
+TAR_OPTIONS+= --strip-components 1
+TAR_CMD=$(HOST_TAR) -C $(1) $(TAR_OPTIONS)
+
+define KernelPackage/fs-ksmbd
+	SUBMENU:=Filesystems
+	TITLE:=SMB kernel server support
+	URL:=https://github.com/cifsd-team/cifsd
+	FILES:=$(PKG_BUILD_DIR)/ksmbd.ko
+	DEPENDS:= \
+		+kmod-nls-base \
+		+kmod-nls-utf8 \
+		+kmod-crypto-md4 \
+		+kmod-crypto-md5 \
+		+kmod-crypto-hmac \
+		+kmod-crypto-ecb \
+		+kmod-crypto-des \
+		+kmod-crypto-sha256 \
+		+kmod-crypto-cmac \
+		+kmod-crypto-sha512 \
+		+kmod-crypto-aead \
+		+kmod-crypto-ccm \
+		+kmod-crypto-gcm \
+		+kmod-asn1-decoder \
+		+kmod-oid-registry
+endef
+
+# The last two DEPENDS are hacks in order to get CONFIG_ASN1 and CONFIG_OID_REGISTRY
+# which it seems can't be selected independently. Some bug in either base or upstream.
+
+define KernelPackage/fs-ksmbd/description
+  Ksmbd is an In-kernel SMBv(1)2/3 fileserver.
+  It's an implementation of the SMB protocol in kernel space for sharing files and IPC services over network.
+endef
+
+define KernelPackage/fs-ksmbd/config
+config KSMBD_SMB_INSECURE_SERVER
+	bool "Support for insecure SMB1/CIFS and SMB2.0 protocols"
+	depends on PACKAGE_kmod-fs-ksmbd
+	help
+		This enables deprecated insecure protocols dialects: SMB1/CIFS and SMB2.0.
+	default y
+endef
+
+ifeq ($(CONFIG_KSMBD_SMB_INSECURE_SERVER),y)
+PKG_EXTRA_KCONFIG:=CONFIG_SMB_INSECURE_SERVER=y
+EXTRA_CFLAGS += -DCONFIG_SMB_INSECURE_SERVER=1
+endif
+
+define Build/Compile
+	$(KERNEL_MAKE) M="$(PKG_BUILD_DIR)" \
+	EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
+	$(PKG_EXTRA_KCONFIG) \
+	CONFIG_SMB_SERVER=m \
+	modules
+endef
+
+$(eval $(call KernelPackage,fs-ksmbd))

package/kernel/ksmbd/patches/01-keep_kmod_metadata.patch

+--- a/glob.h
++++ b/glob.h
+@@ -7,6 +7,8 @@
+ #ifndef __KSMBD_GLOB_H
+ #define __KSMBD_GLOB_H
+ 
++#undef CONFIG_MODULE_STRIPPED
++
+ #include <linux/ctype.h>
+ 
+ #include "unicode.h"