more API touch ups

ipv6/icmpv6/client.go

@@ -76,6 +76,10 @@ func (client *Client) Configure(cfg ClientConfig) error {
 	}
 	return nil
 }
+func (client *Client) SetAddr6(addr [16]byte) {
+	client.ourIP = addr
+	client.Reset()
+}
 
 func (client *Client) Protocol() uint64      { return uint64(lneto.IPProtoIPv6ICMP) }
 func (client *Client) LocalPort() uint16     { return 0 }

x/xnet/stack-async.go

@@ -359,6 +359,24 @@ func (s *StackAsync) Addr4() [4]byte {
 	return s.ip4.Addr4()
 }
 
+func (s *StackAsync) SetAddr6(addr [16]byte) error {
+	if s.ipv6enabled {
+		s.mu.Lock()
+		defer s.mu.Unlock()
+		return s.stack6.SetAddr6(addr)
+	}
+	return lneto.ErrUnsupported
+}
+
+func (s *StackAsync) Addr6() [16]byte {
+	if s.ipv6enabled {
+		s.mu.Lock()
+		defer s.mu.Unlock()
+		return s.stack6.Addr6()
+	}
+	return [16]byte{}
+}
+
 func (s *StackAsync) SetSubnet4(addr [4]byte, prefixBits uint8) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -405,7 +423,7 @@ func (s *StackAsync) EnableICMP(enabled bool) (err error) {
 		s.icmp.Abort()
 	}
 	if s.ipv6enabled {
-		if err2 := s.stack6.EnableICMP6(enabled); err2 != nil {
+		if err2 := s.stack6.EnableICMP6(enabled); err2 != nil && err == nil {
 			err = err2
 		}
 	}

x/xnet/stack6.go

@@ -20,7 +20,7 @@ func DefaultStack6() Stack6 {
 type Stack6 interface {
 	Reset6(cfg *StackConfig) error
 	Addr6() [16]byte
-	SetAddr6(addr [16]byte)
+	SetAddr6(addr [16]byte) error
 
 	EnableICMP6(enabled bool) error
 	Register6(node lneto.StackNode) error
@@ -48,7 +48,12 @@ type stack6 struct {
 
 func (s *stack6) Register6(node lneto.StackNode) error { return s.ip6.Register6(node) }
 func (s *stack6) Addr6() [16]byte                      { return s.ip6.Addr6() }
-func (s *stack6) SetAddr6(addr [16]byte)               { s.ip6.SetAddr6(addr) }
+func (s *stack6) SetAddr6(addr [16]byte) error {
+	s.ip6.SetAddr6(addr)
+	s.icmp6.SetAddr6(addr)
+	s.dropNDPPending()
+	return nil
+}
 
 func (s *stack6) IPv6Stack() lneto.StackNode { return &s.ip6 }
 
@@ -210,3 +215,10 @@ func (s *stack6) ndpDynamicResolve(raddr [16]byte) ([]byte, error) {
 	e.macBuf = macBuf
 	return macBuf, nil
 }
+
+func (s *stack6) dropNDPPending() {
+	for i := range s.ndpPending {
+		s.ndpPending[i].macBuf = nil
+		s.ndpPending[i].addr = [16]byte{}
+	}
+}