networkd: Assign VXLAN destination port to when GPE is set

When VXLAN destination port is unset and GPE is set
then assign 4790 to destination port. Kernel does the same as
well as iproute.

IANA VXLAN-GPE port is 4790

diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml
index 7fddedf6e8ff7aebe851d3d1690b5c9e4c320ef9..fc33f89a3883cdf186de82eb46c3951c39fb247a 100644 (file)
--- a/man/systemd.netdev.xml
+++ b/man/systemd.netdev.xml
@@ -661,7 +661,8 @@
          <para>Takes a boolean. When true, Generic Protocol Extension extends the existing VXLAN protocol
          to provide protocol typing, OAM, and versioning capabilities. For details about the VXLAN GPE
          Header, see the <ulink url="https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-07">
-         Generic Protocol Extension for VXLAN </ulink> document. Defaults to false.</para>
+         Generic Protocol Extension for VXLAN </ulink> document. If destination port is not specified and
+         Generic Protocol Extension is set then default port of 4790 is used. Defaults to false.</para>
        </listitem>
     </varlistentry>
     <varlistentry>

diff --git a/src/network/netdev/vxlan.c b/src/network/netdev/vxlan.c
index 86403696a01ed1e64511ec291a662397b927f02c..56c97cb6865e6c7e1a6fecde8e5867648ea265e8 100644 (file)
--- a/src/network/netdev/vxlan.c
+++ b/src/network/netdev/vxlan.c
@@ -289,6 +289,9 @@ static int netdev_vxlan_verify(NetDev *netdev, const char *filename) {
                                                 "%s: VXLAN TTL must be <= 255. Ignoring.",
                                                 filename);
 
+        if (!v->dest_port && v->generic_protocol_extension)
+                v->dest_port = 4790;
+
         return 0;
 }