From fcab5314330d95a47d2cc8e31f467f0690262b3a Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Mon, 18 Dec 2017 15:20:34 +0100
Subject: [PATCH] networkd: add support for wireguard interface type

More information may be found at wireguard.com.
---
 man/custom-html.xsl            |  14 ++-
 src/shared/meson.build         |  28 +++---
 src/shared/wireguard-netlink.h | 179 +++++++++++++++++++++++++++++++++
 3 files changed, 207 insertions(+), 14 deletions(-)
 create mode 100644 src/shared/wireguard-netlink.h

diff --git a/man/custom-html.xsl b/man/custom-html.xsl
index e1f2ff303..9f48d78b2 100644
--- a/man/custom-html.xsl
+++ b/man/custom-html.xsl
@@ -1,9 +1,9 @@
 <?xml version='1.0'?> <!--*-nxml-*-->
 
 <!--
-  This file is part of elogind.
   SPDX-License-Identifier: LGPL-2.1+
 
+  This file is part of elogind.
 
   Copyright 2011 Lennart Poettering
 
@@ -73,6 +73,18 @@
   </a>
 </xsl:template>
 
+<xsl:template match="citerefentry[@project='wireguard']">
+  <a>
+    <xsl:attribute name="href">
+      <xsl:text>https://git.zx2c4.com/WireGuard/about/src/tools/</xsl:text>
+      <xsl:value-of select="refentrytitle"/>
+      <xsl:text>.</xsl:text>
+      <xsl:value-of select="manvolnum"/>
+    </xsl:attribute>
+    <xsl:call-template name="inline.charseq"/>
+  </a>
+</xsl:template>
+
 <xsl:template match="citerefentry[@project='mankier']">
   <a>
     <xsl:attribute name="href">
diff --git a/src/shared/meson.build b/src/shared/meson.build
index de1a98f12..12d05cf34 100644
--- a/src/shared/meson.build
+++ b/src/shared/meson.build
@@ -57,6 +57,8 @@
 #         firewall-util.h
 #         fstab-util.c
 #         fstab-util.h
+#         gcrypt-util.c
+#         gcrypt-util.h
 #         generator.c
 #         generator.h
 #         gpt.h
@@ -119,6 +121,7 @@
 #         volatile-util.h
 #         watchdog.c
 #         watchdog.h
+#         wireguard-netlink.h
 # '''.split()
 #else
 shared_sources = '''
@@ -191,25 +194,24 @@ libshared_deps = [threads,
 
 libshared_sym_path = '@0@/libshared.sym'.format(meson.current_source_dir())
 
-libshared_static = static_library(
-        libshared_name,
-        shared_sources,
-        include_directories : includes,
-        dependencies : libshared_deps,
-        c_args : ['-fvisibility=default'])
-
 libshared = shared_library(
         libshared_name,
+        shared_sources,
+        basic_sources,
+        journal_internal_sources,
+        libelogind_internal_sources,
 #if 0 /// UNNEEDED by elogind
 #         libudev_sources,
 #         include_directories : includes,
 #         link_args : ['-shared',
-#                      '-Wl,--version-script=' + libshared_sym_path],
-#         link_whole : [libshared_static,
-#                       libbasic,
-#                       libbasic_gcrypt,
-#                       libsystemd_static,
-#                       libjournal_client],
+#                     '-Wl,--version-script=' + libshared_sym_path],
+# 
+# libshared_static = static_library(
+#         libshared_name,
+#         shared_sources,
+#         basic_sources,
+#         include_directories : includes,
+#         dependencies : libshared_deps)
 #else
         libelogind_internal_sources,
 #endif // 0
diff --git a/src/shared/wireguard-netlink.h b/src/shared/wireguard-netlink.h
new file mode 100644
index 000000000..eb170915a
--- /dev/null
+++ b/src/shared/wireguard-netlink.h
@@ -0,0 +1,179 @@
+#pragma once
+
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR MIT)
+ *
+ * Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ *
+ * Documentation
+ * =============
+ *
+ * The below enums and macros are for interfacing with WireGuard, using generic
+ * netlink, with family WG_GENL_NAME and version WG_GENL_VERSION. It defines two
+ * methods: get and set. Note that while they share many common attributes, these
+ * two functions actually accept a slightly different set of inputs and outputs.
+ *
+ * WG_CMD_GET_DEVICE
+ * -----------------
+ *
+ * May only be called via NLM_F_REQUEST | NLM_F_DUMP. The command should contain
+ * one but not both of:
+ *
+ *	WGDEVICE_A_IFINDEX: NLA_U32
+ *	WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
+ *
+ * The kernel will then return several messages (NLM_F_MULTI) containing the following
+ * tree of nested items:
+ *
+ *	WGDEVICE_A_IFINDEX: NLA_U32
+ *	WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
+ *	WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN
+ *	WGDEVICE_A_PUBLIC_KEY: len WG_KEY_LEN
+ *	WGDEVICE_A_LISTEN_PORT: NLA_U16
+ *	WGDEVICE_A_FWMARK: NLA_U32
+ *	WGDEVICE_A_PEERS: NLA_NESTED
+ *		0: NLA_NESTED
+ *			WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
+ *			WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN
+ *			WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
+ *			WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16
+ *			WGPEER_A_LAST_HANDSHAKE_TIME: struct timespec
+ *			WGPEER_A_RX_BYTES: NLA_U64
+ *			WGPEER_A_TX_BYTES: NLA_U64
+ *			WGPEER_A_ALLOWEDIPS: NLA_NESTED
+ *				0: NLA_NESTED
+ *					WGALLOWEDIP_A_FAMILY: NLA_U16
+ *					WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
+ *					WGALLOWEDIP_A_CIDR_MASK: NLA_U8
+ *				1: NLA_NESTED
+ *					...
+ *				2: NLA_NESTED
+ *					...
+ *				...
+ *		1: NLA_NESTED
+ *			...
+ *		...
+ *
+ * It is possible that all of the allowed IPs of a single peer will not
+ * fit within a single netlink message. In that case, the same peer will
+ * be written in the following message, except it will only contain
+ * WGPEER_A_PUBLIC_KEY and WGPEER_A_ALLOWEDIPS. This may occur several
+ * times in a row for the same peer. It is then up to the receiver to
+ * coalesce adjacent peers. Likewise, it is possible that all peers will
+ * not fit within a single message. So, subsequent peers will be sent
+ * in following messages, except those will only contain WGDEVICE_A_IFNAME
+ * and WGDEVICE_A_PEERS. It is then up to the receiver to coalesce these
+ * messages to form the complete list of peers.
+ *
+ * Since this is an NLA_F_DUMP command, the final message will always be
+ * NLMSG_DONE, even if an error occurs. However, this NLMSG_DONE message
+ * contains an integer error code. It is either zero or a negative error
+ * code corresponding to the errno.
+ *
+ * WG_CMD_SET_DEVICE
+ * -----------------
+ *
+ * May only be called via NLM_F_REQUEST. The command should contain the following
+ * tree of nested items, containing one but not both of WGDEVICE_A_IFINDEX
+ * and WGDEVICE_A_IFNAME:
+ *
+ *	WGDEVICE_A_IFINDEX: NLA_U32
+ *	WGDEVICE_A_IFNAME: NLA_NUL_STRING, maxlen IFNAMESIZ - 1
+ *	WGDEVICE_A_FLAGS: NLA_U32, 0 or WGDEVICE_F_REPLACE_PEERS if all current
+ *			  peers should be removed prior to adding the list below.
+ *	WGDEVICE_A_PRIVATE_KEY: len WG_KEY_LEN, all zeros to remove
+ *	WGDEVICE_A_LISTEN_PORT: NLA_U16, 0 to choose randomly
+ *	WGDEVICE_A_FWMARK: NLA_U32, 0 to disable
+ *	WGDEVICE_A_PEERS: NLA_NESTED
+ *		0: NLA_NESTED
+ *			WGPEER_A_PUBLIC_KEY: len WG_KEY_LEN
+ *			WGPEER_A_FLAGS: NLA_U32, 0 and/or WGPEER_F_REMOVE_ME if the specified peer
+ *					should be removed rather than added/updated and/or
+ *					WGPEER_F_REPLACE_ALLOWEDIPS if all current allowed IPs of
+ *					this peer should be removed prior to adding the list below.
+ *			WGPEER_A_PRESHARED_KEY: len WG_KEY_LEN, all zeros to remove
+ *			WGPEER_A_ENDPOINT: struct sockaddr_in or struct sockaddr_in6
+ *			WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL: NLA_U16, 0 to disable
+ *			WGPEER_A_ALLOWEDIPS: NLA_NESTED
+ *				0: NLA_NESTED
+ *					WGALLOWEDIP_A_FAMILY: NLA_U16
+ *					WGALLOWEDIP_A_IPADDR: struct in_addr or struct in6_addr
+ *					WGALLOWEDIP_A_CIDR_MASK: NLA_U8
+ *				1: NLA_NESTED
+ *					...
+ *				2: NLA_NESTED
+ *					...
+ *				...
+ *		1: NLA_NESTED
+ *			...
+ *		...
+ *
+ * It is possible that the amount of configuration data exceeds that of
+ * the maximum message length accepted by the kernel. In that case,
+ * several messages should be sent one after another, with each
+ * successive one filling in information not contained in the prior. Note
+ * that if WGDEVICE_F_REPLACE_PEERS is specified in the first message, it
+ * probably should not be specified in fragments that come after, so that
+ * the list of peers is only cleared the first time but appened after.
+ * Likewise for peers, if WGPEER_F_REPLACE_ALLOWEDIPS is specified in the
+ * first message of a peer, it likely should not be specified in subsequent
+ * fragments.
+ *
+ * If an error occurs, NLMSG_ERROR will reply containing an errno.
+ */
+
+#define WG_GENL_NAME "wireguard"
+#define WG_GENL_VERSION 1
+
+#define WG_KEY_LEN 32
+
+enum wg_cmd {
+        WG_CMD_GET_DEVICE,
+        WG_CMD_SET_DEVICE,
+        __WG_CMD_MAX
+};
+#define WG_CMD_MAX (__WG_CMD_MAX - 1)
+
+enum wgdevice_flag {
+ WGDEVICE_F_REPLACE_PEERS = 1U << 0
+};
+enum wgdevice_attribute {
+        WGDEVICE_A_UNSPEC,
+        WGDEVICE_A_IFINDEX,
+        WGDEVICE_A_IFNAME,
+        WGDEVICE_A_PRIVATE_KEY,
+        WGDEVICE_A_PUBLIC_KEY,
+        WGDEVICE_A_FLAGS,
+        WGDEVICE_A_LISTEN_PORT,
+        WGDEVICE_A_FWMARK,
+        WGDEVICE_A_PEERS,
+        __WGDEVICE_A_LAST
+};
+#define WGDEVICE_A_MAX (__WGDEVICE_A_LAST - 1)
+
+enum wgpeer_flag {
+        WGPEER_F_REMOVE_ME = 1U << 0,
+        WGPEER_F_REPLACE_ALLOWEDIPS = 1U << 1
+};
+enum wgpeer_attribute {
+        WGPEER_A_UNSPEC,
+        WGPEER_A_PUBLIC_KEY,
+        WGPEER_A_PRESHARED_KEY,
+        WGPEER_A_FLAGS,
+        WGPEER_A_ENDPOINT,
+        WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL,
+        WGPEER_A_LAST_HANDSHAKE_TIME,
+        WGPEER_A_RX_BYTES,
+        WGPEER_A_TX_BYTES,
+        WGPEER_A_ALLOWEDIPS,
+        __WGPEER_A_LAST
+};
+#define WGPEER_A_MAX (__WGPEER_A_LAST - 1)
+
+enum wgallowedip_attribute {
+        WGALLOWEDIP_A_UNSPEC,
+        WGALLOWEDIP_A_FAMILY,
+        WGALLOWEDIP_A_IPADDR,
+        WGALLOWEDIP_A_CIDR_MASK,
+        __WGALLOWEDIP_A_LAST
+};
+#define WGALLOWEDIP_A_MAX (__WGALLOWEDIP_A_LAST - 1)
-- 
2.30.2