Perform DAD on IPv6 addresses when enabling a NIC

Addresses may be added before a NIC is enabled. Make sure DAD is
performed on the permanent IPv6 addresses when they get enabled.

Test:
- stack_test.TestDoDADWhenNICEnabled
- stack.TestDisabledRxStatsWhenNICDisabled
PiperOrigin-RevId: 293697429

1 files changed, 5 insertions, 3 deletions

diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index d29d9a704..0e944712f 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -1170,7 +1170,9 @@ type TransportEndpointStats struct {
 // marker interface.
 func (*TransportEndpointStats) IsEndpointStats() {}
 
-func fillIn(v reflect.Value) {
+// InitStatCounters initializes v's fields with nil StatCounter fields to new
+// StatCounters.
+func InitStatCounters(v reflect.Value) {
 	for i := 0; i < v.NumField(); i++ {
 		v := v.Field(i)
 		if s, ok := v.Addr().Interface().(**StatCounter); ok {
@@ -1178,14 +1180,14 @@ func fillIn(v reflect.Value) {
 				*s = new(StatCounter)
 			}
 		} else {
-			fillIn(v)
+			InitStatCounters(v)
 		}
 	}
 }
 
 // FillIn returns a copy of s with nil fields initialized to new StatCounters.
 func (s Stats) FillIn() Stats {
-	fillIn(reflect.ValueOf(&s).Elem())
+	InitStatCounters(reflect.ValueOf(&s).Elem())
 	return s
 }