Tne interface of nvgre(4) has SIOC[SGD]IFPARENT as below from man nvgre:
nvgre interfaces support the following ioctl(2) calls:
SIOCSIFPARENT struct if_parent *
Configure which interface will be joined to the multicast
group specified by the tunnel destination address. The parent
interface may only be configured while the interface is down.
SIOCGIFPARENT struct if_parent *
Get the name of the interface used for multicast
communication.
SIOCDIFPARENT struct ifreq *
Remove the configuration of the interface used for multicast
communication.
Can I append parent option to nvgre in ifconfig.8?
comment, ok?
--
ASOU Masato
Index: sbin/ifconfig/ifconfig.8
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.8,v
retrieving revision 1.393
diff -u -p -r1.393 ifconfig.8
--- sbin/ifconfig/ifconfig.8 25 Apr 2023 05:02:56 -0000 1.393
+++ sbin/ifconfig/ifconfig.8 26 Apr 2023 01:02:10 -0000
@@ -1830,6 +1830,7 @@ for a complete list of the available pro
.Nm ifconfig
.Ar tunnel-interface
.Op Oo Fl Oc Ns Cm keepalive Ar period count
+.Op Oo Fl Oc Ns Cm parent Ar parent-interface
.Op Cm rxprio Ar prio
.Op Oo Fl Oc Ns Cm tunnel Ar src_address dest_address
.Op Cm tunneladdr Ar src_address
@@ -1875,6 +1876,16 @@ is 2 since the round-trip time of keepal
Disable the
.Xr gre 4
keepalive mechanism.
+.It Cm parent Ar parent-interface
+Associate the
+.Xr nvgre 4
+interface with the interface
+.Ar parent-interface .
+.It Cm -parent
+Disassociate from the parent interface.
+This breaks the link between the
+.Xr nvgre 4
+interface and its parent.
.It Cm rxprio Ar prio
Configure the source used for the packet priority when decapsulating a packet.
The value can be a priority number from 0 to 7, or
