From 0d07e595cc22379ec7388406c2f4f2a74eea9083 Mon Sep 17 00:00:00 2001
From: Jens Kuske <jenskuske@gmail.com>
Date: Wed, 23 Sep 2015 17:26:36 +0200
Subject: [PATCH] networkd: add support to configure preferred source of static
 routes

---
 man/systemd.network.xml                  |  8 +++++
 src/network/networkd-network-gperf.gperf |  1 +
 src/network/networkd-route.c             | 40 ++++++++++++++++++++++++
 src/network/networkd-route.h             |  1 +
 4 files changed, 50 insertions(+)

diff --git a/man/systemd.network.xml b/man/systemd.network.xml
index 629088ea81..e505fbe30f 100644
--- a/man/systemd.network.xml
+++ b/man/systemd.network.xml
@@ -545,6 +545,14 @@
             <literal>global</literal>.</para>
           </listitem>
         </varlistentry>
+        <varlistentry>
+          <term><varname>PreferredSource=</varname></term>
+          <listitem>
+            <para>The preferred source address of the route. The address
+            must be in the format described in
+            <citerefentry project='man-pages'><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
+          </listitem>
+        </varlistentry>
       </variablelist>
   </refsect1>
 
diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf
index 8257ab45da..b6f70e191d 100644
--- a/src/network/networkd-network-gperf.gperf
+++ b/src/network/networkd-network-gperf.gperf
@@ -61,6 +61,7 @@ Route.Destination,                      config_parse_destination,
 Route.Source,                           config_parse_destination,                       0,                             0
 Route.Metric,                           config_parse_route_priority,                    0,                             0
 Route.Scope,                            config_parse_route_scope,                       0,                             0
+Route.PreferredSource,                  config_parse_preferred_src,                     0,                             0
 DHCP.ClientIdentifier,                  config_parse_dhcp_client_identifier,            0,                             offsetof(Network, dhcp_client_identifier)
 DHCP.UseDNS,                            config_parse_bool,                              0,                             offsetof(Network, dhcp_dns)
 DHCP.UseNTP,                            config_parse_bool,                              0,                             offsetof(Network, dhcp_ntp)
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index fbaad40579..ef8d2cbb05 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -306,6 +306,46 @@ int config_parse_gateway(const char *unit,
         return 0;
 }
 
+int config_parse_preferred_src(const char *unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        Network *network = userdata;
+        _cleanup_route_free_ Route *n = NULL;
+        union in_addr_union buffer;
+        int r, f;
+
+        assert(filename);
+        assert(section);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        r = route_new_static(network, section_line, &n);
+        if (r < 0)
+                return r;
+
+        r = in_addr_from_string_auto(rvalue, &f, &buffer);
+        if (r < 0) {
+                log_syntax(unit, LOG_ERR, filename, line, EINVAL,
+                           "Preferred source is invalid, ignoring assignment: %s", rvalue);
+                return 0;
+        }
+
+        n->family = f;
+        n->prefsrc_addr = buffer;
+        n = NULL;
+
+        return 0;
+}
+
 int config_parse_destination(const char *unit,
                 const char *filename,
                 unsigned line,
diff --git a/src/network/networkd-route.h b/src/network/networkd-route.h
index d090b9c91e..11e94d44fb 100644
--- a/src/network/networkd-route.h
+++ b/src/network/networkd-route.h
@@ -55,6 +55,7 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(Route*, route_free);
 #define _cleanup_route_free_ _cleanup_(route_freep)
 
 int config_parse_gateway(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
+int config_parse_preferred_src(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_destination(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_route_priority(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
 int config_parse_route_scope(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);