package/fastd: bump version to 22

There's a new feature to offload L2TP to the Linux kernel, which depends
on libmnl.  A new menu option was introduced for that.

It's possible to link an internal version of libmnl
statically for smaller binary size on constraint targets, but this was
not added to the buildroot package for complexity reasons (both build
and licensing).

The COPYING file gained an additional paragraph for internal libmnl
which does not apply, because internal libmnl is not used in the
package.

Link: https://fastd.readthedocs.io/en/latest/releases/v22.html
Signed-off-by: Alexander Dahl <post@lespocky.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/fastd/Config.in

@@ -21,6 +21,13 @@ config BR2_PACKAGE_FASTD_STATUS_SOCKET
 	help
 	  Enable support for a socket to get fastd's status.
 
+config BR2_PACKAGE_FASTD_OFFLOAD_L2TP
+	bool "l2tp offload support"
+	select BR2_PACKAGE_LIBMNL
+	help
+	  L2TP can be offloaded to the Linux kernel, significantly
+	  increasing throughput.
+
 endif
 
 comment "fastd needs a toolchain w/ threads, dynamic library"

package/fastd/fastd.hash

@@ -1,3 +1,3 @@
 # computed locally
-sha256  942f33bcd794bcb8e19da4c30c875bdfd4d0f1c24ec4dcdf51237791bbfb0d4c  fastd-21.tar.xz
-sha256  1f5acece57466eac89108f934a196be09b7676fa2d637e78d6657ee1a7d644ac  COPYRIGHT
+sha256  19750b88705d66811b7c21b672537909c19ae6b21350688cbd1a3a54d08a8951  fastd-22.tar.xz
+sha256  adf08b42f1b890b89e998360a864cb4f8441a0a57c9e95e2ce1bfdfc24c49976  COPYRIGHT

package/fastd/fastd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-FASTD_VERSION = 21
+FASTD_VERSION = 22
 FASTD_SITE = https://github.com/NeoRaider/fastd/releases/download/v$(FASTD_VERSION)
 FASTD_SOURCE = fastd-$(FASTD_VERSION).tar.xz
 FASTD_LICENSE = BSD-2-Clause
@@ -33,6 +33,13 @@ else
 FASTD_CONF_OPTS += -Dstatus_socket=disabled
 endif
 
+ifeq ($(BR2_PACKAGE_FASTD_OFFLOAD_L2TP),y)
+FASTD_CONF_OPTS += -Doffload_l2tp=enabled -Dlibmnl_builtin=false
+FASTD_DEPENDENCIES += libmnl
+else
+FASTD_CONF_OPTS += -Doffload_l2tp=disabled
+endif
+
 ifeq ($(BR2_INIT_SYSTEMD),y)
 FASTD_CONF_OPTS += -Dsystemd=enabled
 else