wireguard: add wireguard to base packages

Move wireguard from openwrt/packages to base a package.

This follows the pattern of kmod-cake and openvpn. Cake is a fast-moving
experimental kernel module that many find essential and useful. The
other is a VPN client. Both are inside of core. When you combine the two
characteristics, you get WireGuard. Generally speaking, because of the
extremely lightweight nature and "stateless" configuration of WireGuard,
many view it as a core and essential utility, initiated at boot time
and immediately configured by netifd, much like the use of things like
GRE tunnels.

WireGuard has a backwards and forwards compatible Netlink API, which
means the userspace tools should work with both newer and older kernels
as things change. There should be no versioning requirements, therefore,
between kernel bumps and userspace package bumps.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Jo-Philipp Wich <jo@mein.io>
Acked-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 699c6fcc314225f79156a26db418e15bbc6bf10f)

package/network/services/wireguard/Makefile

@@ -0,0 +1,116 @@
+#
+# Copyright (C) 2016-2017 Jason A. Donenfeld <Jason@zx2c4.com>
+# Copyright (C) 2016 Baptiste Jonglez <openwrt@bitsofnetworks.org>
+# Copyright (C) 2016-2017 Dan Luedtke <mail@danrl.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=wireguard
+
+PKG_VERSION:=0.0.20171011
+PKG_RELEASE:=1
+
+PKG_SOURCE:=WireGuard-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=https://git.zx2c4.com/WireGuard/snapshot/
+PKG_HASH:=e2e44ff658743507bca0f6b443c2f85aacc48d507ba2dcd4812717145df10b96
+
+PKG_LICENSE:=GPL-2.0 Apache-2.0
+PKG_LICENSE_FILES:=COPYING
+
+PKG_BUILD_DIR:=$(BUILD_DIR)/WireGuard-$(PKG_VERSION)
+PKG_BUILD_PARALLEL:=1
+PKG_USE_MIPS16:=0
+
+# WireGuard's makefile needs this to know where to build the kernel module
+export KERNELDIR:=$(LINUX_DIR)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/wireguard/Default
+  SECTION:=net
+  CATEGORY:=Network
+  SUBMENU:=VPN
+  URL:=https://www.wireguard.com
+  MAINTAINER:=Baptiste Jonglez <openwrt@bitsofnetworks.org>, \
+              Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>, \
+              Dan Luedtke <mail@danrl.com>, \
+              Jason A. Donenfeld <Jason@zx2c4.com>
+endef
+
+define Package/wireguard/Default/description
+  WireGuard is a novel VPN that runs inside the Linux Kernel and utilizes
+  state-of-the-art cryptography. It aims to be faster, simpler, leaner, and
+  more useful than IPSec, while avoiding the massive headache. It intends to
+  be considerably more performant than OpenVPN.  WireGuard is designed as a
+  general purpose VPN for running on embedded interfaces and super computers
+  alike, fit for many different circumstances. It uses UDP.
+endef
+
+define Package/wireguard
+  $(call Package/wireguard/Default)
+  TITLE:=WireGuard meta-package
+  DEPENDS:=+wireguard-tools +kmod-wireguard
+endef
+
+include $(INCLUDE_DIR)/kernel-defaults.mk
+include $(INCLUDE_DIR)/package-defaults.mk
+
+# Used by Build/Compile/Default
+MAKE_PATH:=src/tools
+
+define Build/Compile
+	$(MAKE) $(KERNEL_MAKEOPTS) M="$(PKG_BUILD_DIR)/src" modules
+	$(call Build/Compile/Default)
+endef
+
+define Package/wireguard/install
+  true
+endef
+
+define Package/wireguard/description
+  $(call Package/wireguard/Default/description)
+endef
+
+define Package/wireguard-tools
+  $(call Package/wireguard/Default)
+  TITLE:=WireGuard userspace control program (wg)
+  DEPENDS:=+libmnl +ip
+endef
+
+define Package/wireguard-tools/description
+  $(call Package/wireguard/Default/description)
+
+  This package provides the userspace control program for WireGuard,
+  `wg(8)`, and a netifd protocol helper.
+endef
+
+define Package/wireguard-tools/install
+	$(INSTALL_DIR) $(1)/usr/bin/
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/src/tools/wg $(1)/usr/bin/
+	$(INSTALL_DIR) $(1)/lib/netifd/proto/
+	$(INSTALL_BIN) ./files/wireguard.sh $(1)/lib/netifd/proto/
+endef
+
+define KernelPackage/wireguard
+  SECTION:=kernel
+  CATEGORY:=Kernel modules
+  SUBMENU:=Network Support
+  TITLE:=WireGuard kernel module
+  DEPENDS:=+IPV6:kmod-udptunnel6 +kmod-udptunnel4
+  FILES:= $(PKG_BUILD_DIR)/src/wireguard.$(LINUX_KMOD_SUFFIX)
+  AUTOLOAD:=$(call AutoProbe,wireguard)
+endef
+
+define KernelPackage/wireguard/description
+  $(call Package/wireguard/Default/description)
+
+  This package provides the kernel module for WireGuard.
+endef
+
+$(eval $(call BuildPackage,wireguard))
+$(eval $(call BuildPackage,wireguard-tools))
+$(eval $(call KernelPackage,wireguard))

package/network/services/wireguard/files/wireguard.sh

@@ -0,0 +1,192 @@
+#!/bin/sh
+# Copyright 2016-2017 Dan Luedtke <mail@danrl.com>
+# Licensed to the public under the Apache License 2.0.
+
+
+WG=/usr/bin/wg
+if [ ! -x $WG ]; then
+  logger -t "wireguard" "error: missing wireguard-tools (${WG})"
+  exit 0
+fi
+
+
+[ -n "$INCLUDE_ONLY" ] || {
+  . /lib/functions.sh
+  . ../netifd-proto.sh
+  init_proto "$@"
+}
+
+
+proto_wireguard_init_config() {
+  proto_config_add_string "private_key"
+  proto_config_add_int    "listen_port"
+  proto_config_add_int    "mtu"
+  proto_config_add_string "fwmark"
+  available=1
+  no_proto_task=1
+}
+
+
+proto_wireguard_setup_peer() {
+  local peer_config="$1"
+
+  local public_key
+  local preshared_key
+  local allowed_ips
+  local route_allowed_ips
+  local endpoint_host
+  local endpoint_port
+  local persistent_keepalive
+
+  config_get      public_key           "${peer_config}" "public_key"
+  config_get      preshared_key        "${peer_config}" "preshared_key"
+  config_get      allowed_ips          "${peer_config}" "allowed_ips"
+  config_get_bool route_allowed_ips    "${peer_config}" "route_allowed_ips" 0
+  config_get      endpoint_host        "${peer_config}" "endpoint_host"
+  config_get      endpoint_port        "${peer_config}" "endpoint_port"
+  config_get      persistent_keepalive "${peer_config}" "persistent_keepalive"
+
+  # peer configuration
+  echo "[Peer]"                                         >> "${wg_cfg}"
+  echo "PublicKey=${public_key}"                        >> "${wg_cfg}"
+  if [ "${preshared_key}" ]; then
+    echo "PresharedKey=${preshared_key}"                >> "${wg_cfg}"
+  fi
+  for allowed_ip in $allowed_ips; do
+    echo "AllowedIPs=${allowed_ip}"                     >> "${wg_cfg}"
+  done
+  if [ "${endpoint_host}" ]; then
+    case "${endpoint_host}" in
+      *:*)
+        endpoint="[${endpoint_host}]"
+      ;;
+      *)
+        endpoint="${endpoint_host}"
+      ;;
+    esac
+    if [ "${endpoint_port}" ]; then
+      endpoint="${endpoint}:${endpoint_port}"
+    else
+      endpoint="${endpoint}:51820"
+    fi
+    echo "Endpoint=${endpoint}"                         >> "${wg_cfg}"
+  fi
+  if [ "${persistent_keepalive}" ]; then
+    echo "PersistentKeepalive=${persistent_keepalive}"  >> "${wg_cfg}"
+  fi
+
+  # add routes for allowed ips
+  if [ ${route_allowed_ips} -ne 0 ]; then
+    for allowed_ip in ${allowed_ips}; do
+      case "${allowed_ip}" in
+        *:*/*)
+          proto_add_ipv6_route "${allowed_ip%%/*}" "${allowed_ip##*/}"
+        ;;
+        *.*/*)
+          proto_add_ipv4_route "${allowed_ip%%/*}" "${allowed_ip##*/}"
+        ;;
+        *:*)
+          proto_add_ipv6_route "${allowed_ip%%/*}" "128"
+        ;;
+        *.*)
+          proto_add_ipv4_route "${allowed_ip%%/*}" "32"
+        ;;
+      esac
+    done
+  fi
+}
+
+
+proto_wireguard_setup() {
+  local config="$1"
+  local wg_dir="/tmp/wireguard"
+  local wg_cfg="${wg_dir}/${config}"
+
+  local private_key
+  local listen_port
+  local mtu
+
+  # load configuration
+  config_load network
+  config_get private_key   "${config}" "private_key"
+  config_get listen_port   "${config}" "listen_port"
+  config_get addresses     "${config}" "addresses"
+  config_get mtu           "${config}" "mtu"
+  config_get fwmark        "${config}" "fwmark"
+
+  # create interface
+  ip link del dev "${config}" 2>/dev/null
+  ip link add dev "${config}" type wireguard
+
+  if [ "${mtu}" ]; then
+    ip link set mtu "${mtu}" dev "${config}"
+  fi
+
+  proto_init_update "${config}" 1
+
+  # generate configuration file
+  umask 077
+  mkdir -p "${wg_dir}"
+  echo "[Interface]"                     >  "${wg_cfg}"
+  echo "PrivateKey=${private_key}"       >> "${wg_cfg}"
+  if [ "${listen_port}" ]; then
+    echo "ListenPort=${listen_port}"     >> "${wg_cfg}"
+  fi
+  if [ "${fwmark}" ]; then
+    echo "FwMark=${fwmark}" >> "${wg_cfg}"
+  fi
+  config_foreach proto_wireguard_setup_peer "wireguard_${config}"
+
+  # apply configuration file
+  ${WG} setconf ${config} "${wg_cfg}"
+  WG_RETURN=$?
+
+  # delete configuration file
+  rm -f "${wg_cfg}"
+
+  # check status
+  if [ ${WG_RETURN} -ne 0 ]; then
+    sleep 5
+    proto_setup_failed "${config}"
+    exit 1
+  fi
+
+  # add ip addresses
+  for address in ${addresses}; do
+    case "${address}" in
+      *:*/*)
+        proto_add_ipv6_address "${address%%/*}" "${address##*/}"
+      ;;
+      *.*/*)
+        proto_add_ipv4_address "${address%%/*}" "${address##*/}"
+      ;;
+      *:*)
+        proto_add_ipv6_address "${address%%/*}" "128"
+      ;;
+      *.*)
+        proto_add_ipv4_address "${address%%/*}" "32"
+      ;;
+    esac
+  done
+
+  # endpoint dependency
+  wg show "${config}" endpoints | \
+    sed -E 's/\[?([0-9.:a-f]+)\]?:([0-9]+)/\1 \2/' | \
+    while IFS=$'\t ' read -r key address port; do
+    [ -n "${port}" ] || continue
+    proto_add_host_dependency "${config}" "${address}"
+  done
+
+  proto_send_update "${config}"
+}
+
+
+proto_wireguard_teardown() {
+  local config="$1"
+  ip link del dev "${config}" >/dev/null 2>&1
+}
+
+
+[ -n "$INCLUDE_ONLY" ] || {
+  add_protocol wireguard
+}