vrf: withdraw route-target constraint routes when deleting a vrf

another partial implementation of RFC4686

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>

1 files changed, 11 insertions, 0 deletions

diff --git a/table/vrf.go b/table/vrf.go
index 3833ecac..4474b993 100644
--- a/table/vrf.go
+++ b/table/vrf.go
@@ -44,3 +44,14 @@ func (v *Vrf) ToApiStruct() *api.Vrf {
 		ExportRt: f(v.ExportRt),
 	}
 }
+
+func isLastTargetUser(vrfs map[string]*Vrf, target bgp.ExtendedCommunityInterface) bool {
+	for _, vrf := range vrfs {
+		for _, rt := range vrf.ImportRt {
+			if target.String() == rt.String() {
+				return false
+			}
+		}
+	}
+	return true
+}