Add getter for NDP configuration

PiperOrigin-RevId: 669127173

pkg/tcpip/network/ipv6/ipv6.go

@@ -385,6 +385,13 @@ func (e *endpoint) SetNDPConfigurations(c NDPConfigurations) {
 	e.mu.ndp.configs = c
 }
 
+// NDPConfigurations implements NDPEndpoint.
+func (e *endpoint) NDPConfigurations() NDPConfigurations {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+	return e.mu.ndp.configs
+}
+
 // hasTentativeAddr returns true if addr is tentative on e.
 func (e *endpoint) hasTentativeAddr(addr tcpip.Address) bool {
 	e.mu.RLock()

pkg/tcpip/network/ipv6/ndp.go

@@ -172,6 +172,9 @@ const (
 type NDPEndpoint interface {
 	// SetNDPConfigurations sets the NDP configurations.
 	SetNDPConfigurations(NDPConfigurations)
+
+	// NDPConfigurations returns the NDP configurations.
+	NDPConfigurations() NDPConfigurations
 }
 
 // DHCPv6ConfigurationFromNDPRA is a configuration available via DHCPv6 that an