ipv6: update icmp parameters

Updates golang/go#24440.

Change-Id: Idbe22ca853ea4771bb979782ef3bac8b03c59b87
Reviewed-on: https://go-review.googlesource.com/63998
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

ipv6/gen.go

@@ -80,7 +80,7 @@ var registries = []struct {
 func geniana() error {
 	var bb bytes.Buffer
 	fmt.Fprintf(&bb, "// go generate gen.go\n")
-	fmt.Fprintf(&bb, "// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n")
+	fmt.Fprintf(&bb, "// Code generated by the command above; DO NOT EDIT.\n\n")
 	fmt.Fprintf(&bb, "package ipv6\n\n")
 	for _, r := range registries {
 		resp, err := http.Get(r.url)

ipv6/iana.go

 // go generate gen.go
-// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// Code generated by the command above; DO NOT EDIT.
 
 package ipv6
 
-// Internet Control Message Protocol version 6 (ICMPv6) Parameters, Updated: 2015-07-07
+// Internet Control Message Protocol version 6 (ICMPv6) Parameters, Updated: 2018-03-09
 const (
 	ICMPTypeDestinationUnreachable                ICMPType = 1   // Destination Unreachable
 	ICMPTypePacketTooBig                          ICMPType = 2   // Packet Too Big
@@ -40,9 +40,11 @@ const (
 	ICMPTypeDuplicateAddressRequest               ICMPType = 157 // Duplicate Address Request
 	ICMPTypeDuplicateAddressConfirmation          ICMPType = 158 // Duplicate Address Confirmation
 	ICMPTypeMPLControl                            ICMPType = 159 // MPL Control Message
+	ICMPTypeExtendedEchoRequest                   ICMPType = 160 // Extended Echo Request
+	ICMPTypeExtendedEchoReply                     ICMPType = 161 // Extended Echo Reply
 )
 
-// Internet Control Message Protocol version 6 (ICMPv6) Parameters, Updated: 2015-07-07
+// Internet Control Message Protocol version 6 (ICMPv6) Parameters, Updated: 2018-03-09
 var icmpTypes = map[ICMPType]string{
 	1:   "destination unreachable",
 	2:   "packet too big",
@@ -79,4 +81,6 @@ var icmpTypes = map[ICMPType]string{
 	157: "duplicate address request",
 	158: "duplicate address confirmation",
 	159: "mpl control message",
+	160: "extended echo request",
+	161: "extended echo reply",
 }