server/table: fix intra-AS RTC route distribution

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

3 files changed, 33 insertions, 0 deletions

diff --git a/table/adj.go b/table/adj.go
index 5e685f2e..8aa40370 100644
--- a/table/adj.go
+++ b/table/adj.go
@@ -156,3 +156,16 @@ func (adj *AdjRib) StaleAll(rfList []bgp.RouteFamily) {
 		}
 	}
 }
+
+func (adj *AdjRib) Exists(path *Path) bool {
+	if path == nil {
+		return false
+	}
+	family := path.GetRouteFamily()
+	table, ok := adj.table[family]
+	if !ok {
+		return false
+	}
+	_, ok = table[path.getPrefix()]
+	return ok
+}
diff --git a/table/destination.go b/table/destination.go
index 91d2d89b..e02c7686 100644
--- a/table/destination.go
+++ b/table/destination.go
@@ -254,6 +254,14 @@ func (dest *Destination) Calculate(ids []string) (map[string]*Path, []*Path) {
 		}()
 		best := dest.GetBestPath(id)
 		if best != nil && best.Equal(old) {
+			// RFC4684 3.2. Intra-AS VPN Route Distribution
+			// When processing RT membership NLRIs received from internal iBGP
+			// peers, it is necessary to consider all available iBGP paths for a
+			// given RT prefix, for building the outbound route filter, and not just
+			// the best path.
+			if best.GetRouteFamily() == bgp.RF_RTC_UC {
+				return best
+			}
 			return nil
 		}
 		if best == nil {
diff --git a/table/table_manager.go b/table/table_manager.go
index a041c5b9..cc9784b9 100644
--- a/table/table_manager.go
+++ b/table/table_manager.go
@@ -358,3 +358,15 @@ func (manager *TableManager) GetPathList(id string, rfList []bgp.RouteFamily) []
 	}
 	return paths
 }
+
+func (manager *TableManager) GetDestination(path *Path) *Destination {
+	if path == nil {
+		return nil
+	}
+	family := path.GetRouteFamily()
+	t, ok := manager.Tables[family]
+	if !ok {
+		return nil
+	}
+	return t.GetDestination(path.getPrefix())
+}