packet: fix ValidateAttribute() to handle ipv6 addresss

fixes #1893

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 4 insertions, 0 deletions

diff --git a/pkg/packet/bgp/validate.go b/pkg/packet/bgp/validate.go
index 60cf26e4..a76c906a 100644
--- a/pkg/packet/bgp/validate.go
+++ b/pkg/packet/bgp/validate.go
@@ -159,6 +159,10 @@ func ValidateAttribute(a PathAttributeInterface, rfs map[RouteFamily]BGPAddPathM
 		}
 
 		isClassDorE := func(ip net.IP) bool {
+			if ip.To4() == nil {
+				// needs to verify ipv6 too?
+				return false
+			}
 			res := ip[0] & 0xe0
 			return res == 0xe0
 		}