take a quick run at updating the manpage for the rewritten driver.

diff --git a/share/man/man4/vxlan.4 b/share/man/man4/vxlan.4
index 6b16596..15a2d91 100644 (file)
--- a/share/man/man4/vxlan.4
+++ b/share/man/man4/vxlan.4
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: vxlan.4,v 1.10 2021/01/02 09:56:16 dlg Exp $
+.\"    $OpenBSD: vxlan.4,v 1.11 2022/02/16 02:13:43 dlg Exp $
 .\"
 .\" Copyright (c) 2013 Reyk Floeter <reyk@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: January 2 2021 $
+.Dd $Mdocdate: February 16 2022 $
 .Dt VXLAN 4
 .Os
 .Sh NAME
@@ -25,60 +25,22 @@
 .Sh DESCRIPTION
 The
 .Nm
-interface is a tunnelling pseudo-device for overlaying virtualized
-layer 2 networks over layer 3 networks.
+pseudo-device provides interfaces for tunnelling or overlaying
+Ethernet networks on top of IPv4 and IPv6 networks using the
+Virtual eXtensible Local Area Network (VXLAN) protocol.
+.Pp
+VXLAN datagrams consist of an Ethernet payload encapsulated by an
+8 byte VXLAN header, which in turn is encapsulated by UDP and IP
+headers.
+Different VXLAN tunnels or overlays between the same VXLAN Tunnel
+Endpoints (VTEPs) can be distinguished by an optional 24-bit Virtual
+Network Idenfitier (VNI).
 .Pp
 A
 .Nm
 interface can be created using the
 .Ic ifconfig vxlan Ns Ar N Ic create
-command.
-Once configured, the interface encapsulates and decapsulates Ethernet
-frames in UDP datagrams that are exchanged with tunnel endpoints.
-The default UDP port for VXLAN traffic is 4789.
-.Pp
-Each
-.Nm
-interface uses a 24-bit
-.Ic vnetid
-(virtual networks identifier)
-that distinguishes multiple virtualized layer 2 networks and
-their tunnels between identical tunnel endpoints.
-.Pp
-The interface can operate in the following tunnel modes:
-.Bl -tag -width multicast
-.It Ic unicast mode
-When a unicast IP address is configured as the tunnel destination,
-all traffic is sent to a single tunnel endpoint.
-.It Ic multicast mode
-When a multicast IP address is configured as the tunnel destination,
-all traffic is sent to all the tunnel endpoints that subscribed for the
-specified multicast group.
-.It Ic dynamic mode
-When
-.Nm
-is configured for multicast mode and added to a
-.Xr bridge 4 ,
-all broadcast and multicast traffic is sent to the multicast group,
-but directed traffic is sent to unicast IP addresses of individual tunnel
-endpoints as they are learned by the bridge.
-.It Ic multipoint mode
-When
-.Nm
-is configured with
-.Ic vnetid any
-and added to a
-.Xr bridge 4 ,
-all return traffic is sent to the known tunnel endpoints
-as they are learned by the bridge.
-In this mode,
-.Nm
-does not use a specific virtual network identifier but learns the ones
-of the individual tunnel endpoints.
-It is used to dynamically bridge many virtual networks together.
-.El
-.Pp
-The configuration can be done at runtime or by setting up a
+command or by setting up a
 .Xr hostname.if 5
 configuration file for
 .Xr netstart 8 .
@@ -90,20 +52,33 @@ route to the tunnel destination than the hosts or networks routed
 via the tunnel interface.
 Alternatively, the tunnel traffic may be configured in a separate
 routing table to the encapsulated traffic.
+.Pp
+The interface can operate in the following tunnel modes:
+.Bl -tag -width multicast
+.It Ic point-to-point mode
+When a unicast IP address is configured as the tunnel destination,
+all traffic is sent to a single tunnel endpoint.
+.It Ic learning mode
+When a multicast IP address is configured as the tunnel destination,
+broadcast, multicast, and unknown unicast packets are sent to the
+specified multicast group.
+Packets received by the tunnel source address are used to dynamically
+learn the endpoint addresses for the encapsulated Ethernet source
+addresses.
+.\" .It Ic endpoint mode
+.\" When configured without a tunnel destination address,
+.El
 .Sh EXAMPLES
-Create a tunnel to a unicast tunnel endpoint, using the virtual tunnel
-identifier 5:
+Create a point-to-point tunnel using Virtual Network Identifier 5:
 .Bd -literal -offset indent
 # ifconfig vxlan0 tunnel 192.168.1.100 192.168.1.200 vnetid 5
 # ifconfig vxlan0 10.1.1.100/24
 .Ed
 .Pp
-The following examples creates a dynamic tunnel that is attached to a
-.Xr bridge 4 :
+The following examples creates a learning overlay network:
 .Bd -literal -offset indent
 # ifconfig vxlan0 tunnel 192.168.1.100 239.1.1.100 vnetid 7395
 # ifconfig vxlan0 10.1.2.100/24
-# ifconfig bridge0 add vxlan0 up
 .Ed
 .Pp
 Prior to the assignment of UDP port 4789 by IANA, some early VXLAN
@@ -142,8 +117,8 @@ value to restrict the traffic to the local network:
 # ifconfig vxlan0 tunnelttl 1
 .Ed
 .Sh SEE ALSO
-.Xr bridge 4 ,
 .Xr inet 4 ,
+.Xr udp 4 ,
 .Xr hostname.if 5 ,
 .Xr ifconfig 8 ,
 .Xr netstart 8
@@ -157,20 +132,15 @@ value to restrict the traffic to the local network:
 .%A T. Sridhar
 .%A M. Bursell
 .%A C. Wright
-.%D May 2013
-.%R draft-mahalingam-dutt-dcops-vxlan-04
-.%T VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
+.%D August 2014
+.%R RFC 7348
+.%T Virtual eXtensible Local Area Network (VXLAN): A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
 .Re
 .Sh HISTORY
 The
 .Nm
 device first appeared in
 .Ox 5.5 .
-.Sh AUTHORS
-The
-.Nm
-driver was written by
-.An Reyk Floeter Aq Mt reyk@openbsd.org .
 .Sh CAVEATS
 The
 .Nm
@@ -183,6 +153,3 @@ interoperability with another implementation requires running a
 decreased MTU of 1450 bytes.
 In any other case, it is commonly recommended to set the MTU of the
 transport interfaces to at least 1600 bytes.
-.Pp
-The implementation does not support IPv6 multicast tunnel endpoints at
-present.