MFC r279538:

Fix group membership of cloned interfaces when one is moved by
if_vmove().

In if_vmove(), if_detach_internal() and if_attach_internal() were
called in series to detach and reattach the interface.  When
detaching, if_delgroup() was called and the interface leaves all of
the group membership.  And then upon attachment, if_addgroup(ifp,
IFG_ALL) was called and it joined only "all" group again.

This had a problem. Normally, a cloned interface automatically joins
a group whose name is ifc_name of the cloner in addition to "all"
upon creation.  However, if_vmove() removed the membership and did
not restore upon attachment.

Approved by:	re (gjb)

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/net/if_clone.h b/sys/net/if_clone.h
index 7159421..6e20b29 100644
--- a/sys/net/if_clone.h
+++ b/sys/net/if_clone.h
@@ -68,6 +68,8 @@ void	vnet_if_clone_init(void);
 int	if_clone_create(char *, size_t, caddr_t);
 int	if_clone_destroy(const char *);
 int	if_clone_list(struct if_clonereq *);
+struct if_clone *if_clone_findifc(struct ifnet *);
+void	if_clone_addgroup(struct ifnet *, struct if_clone *);
 
 /* The below interface used only by epair(4). */
 int	if_clone_destroyif(struct if_clone *, struct ifnet *);