wireguard: add WireGuard kernel module and tools

WireGuard is an extremely simple yet fast and modern VPN that utilizes
state-of-the-art cryptography. It aims to be faster, simpler, leaner,
and more useful than IPSec, while avoiding the massive headache.

The recipes add the current experimental snapshot v0.0.20170421
out-of-tree kernel module and tools. The kernel module has some kernel
configuration dependencies such as some configuration part of
features/netfilter/netfilter.scc, hence netfilter.scc should be part
of KERNEL_EXTRA_FEATURES (which is the case by default).

Since wireguard-tools is TUNE_PKGARCH and depends on wireguard-module
which is MACHINE_ARCH (like all kernel modules) we need to add this
dependency to SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>

meta-networking/conf/layer.conf

@@ -21,3 +21,7 @@ LICENSE_PATH += "${LAYERDIR}/licenses"
 
 # Override security flags
 require conf/distro/include/meta_networking_security_flags.inc
+
+SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += " \
+  wireguard-tools->wireguard-module \
+"

meta-networking/recipes-kernel/wireguard/wireguard-module_0.0.20170421.bb

@@ -0,0 +1,13 @@
+require wireguard.inc
+
+inherit module
+
+# This module requires Linux 3.10 higher and several networking related
+# configuration options. For exact kernel requirements visit:
+# https://www.wireguard.io/install/#kernel-requirements
+
+EXTRA_OEMAKE += "KERNELDIR=${STAGING_KERNEL_DIR}"
+MAKE_TARGETS = "module"
+MODULES_INSTALL_TARGET = "module-install"
+
+RRECOMMENDS_${PN} = "kernel-module-xt-hashlimit"

meta-networking/recipes-kernel/wireguard/wireguard-tools_0.0.20170421.bb

@@ -0,0 +1,27 @@
+require wireguard.inc
+
+inherit bash-completion systemd pkgconfig
+
+DEPENDS = "wireguard-module libmnl"
+
+do_compile_prepend () {
+    cd ${S}/tools
+}
+
+do_install () {
+    cd ${S}/tools
+    oe_runmake DESTDIR="${D}" PREFIX="${prefix}" SYSCONFDIR="${sysconfdir}" \
+        SYSTEMDUNITDIR="${systemd_unitdir}" \
+        WITH_SYSTEMDUNITS=${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'yes', '', d)} \
+        WITH_BASHCOMPLETION=yes \
+        WITH_WGQUICK=yes \
+        install
+}
+
+FILES_${PN} = " \
+    ${sysconfdir} \
+    ${systemd_unitdir} \
+    ${bindir} \
+"
+
+RDEPENDS_${PN} = "wireguard-module"

meta-networking/recipes-kernel/wireguard/wireguard.inc

@@ -0,0 +1,18 @@
+SUMMARY = "WireGuard is an extremely simple yet fast and modern VPN"
+DESCRIPTION="WireGuard is a secure network tunnel, operating at layer 3, \
+implemented as a kernel virtual network interface for Linux, which aims to \
+replace both IPsec for most use cases, as well as popular user space and/or \
+TLS-based solutions like OpenVPN, while being more secure, more performant, \
+and easier to use."
+SECTION = "networking"
+HOMEPAGE = "https://www.wireguard.io/"
+LICENSE = "GPLv2"
+
+LIC_FILES_CHKSUM = "file://../COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
+
+SRC_URI = "https://git.zx2c4.com/WireGuard/snapshot/WireGuard-${PV}.tar.xz"
+
+SRC_URI[md5sum] = "8e559f4fd672b15c38a15eb4d88cc84d"
+SRC_URI[sha256sum] = "03c82af774224cd171d000ee4a519b5e474cc6842ac04967773cf77b26750000"
+
+S = "${WORKDIR}/WireGuard-${PV}/src/"