kernel/modules: add kmod-inet-diag package

Add option to compile kmod-inet-diag, support for INET (TCP, DCCP, etc)
socket monitoring interface used by native Linux tools such as ss.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

package/kernel/linux/modules/netsupport.mk

@@ -1295,6 +1295,31 @@ endef
 $(eval $(call KernelPackage,netlink-diag))
 
 
+define KernelPackage/inet-diag
+  SUBMENU:=$(NETWORK_SUPPORT_MENU)
+  TITLE:=INET diag support for ss utility
+  KCONFIG:= \
+	CONFIG_INET_DIAG \
+	CONFIG_INET_TCP_DIAG \
+	CONFIG_INET_UDP_DIAG \
+	CONFIG_INET_RAW_DIAG \
+	CONFIG_INET_DIAG_DESTROY=n
+  FILES:= \
+	$(LINUX_DIR)/net/ipv4/inet_diag.ko \
+	$(LINUX_DIR)/net/ipv4/tcp_diag.ko \
+	$(LINUX_DIR)/net/ipv4/udp_diag.ko \
+	$(LINUX_DIR)/net/ipv4/raw_diag.ko
+  AUTOLOAD:=$(call AutoLoad,31,inet_diag tcp_diag udp_diag raw_diag)
+endef
+
+define KernelPackage/inet-diag/description
+Support for INET (TCP, DCCP, etc) socket monitoring interface used by
+native Linux tools such as ss.
+endef
+
+$(eval $(call KernelPackage,inet-diag))
+
+
 define KernelPackage/wireguard
   SUBMENU:=$(NETWORK_SUPPORT_MENU)
   TITLE:=WireGuard secure network tunnel