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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ipv4
import ""
// An ICMPType represents a type of ICMP message.
type ICMPType int
func (typ ICMPType) String() string {
s, ok := icmpTypes[typ]
if !ok {
return "<nil>"
return s
// Protocol returns the ICMPv4 protocol number.
func (typ ICMPType) Protocol() int {
return iana.ProtocolICMP
// An ICMPFilter represents an ICMP message filter for incoming
// packets. The filter belongs to a packet delivery path on a host and
// it cannot interact with forwarding packets or tunnel-outer packets.
// Note: RFC 2460 defines a reasonable role model and it works not
// only for IPv6 but IPv4. A node means a device that implements IP.
// A router means a node that forwards IP packets not explicitly
// addressed to itself, and a host means a node that is not a router.
type ICMPFilter struct {
// Accept accepts incoming ICMP packets including the type field value
// typ.
func (f *ICMPFilter) Accept(typ ICMPType) {
// Block blocks incoming ICMP packets including the type field value
// typ.
func (f *ICMPFilter) Block(typ ICMPType) {
// SetAll sets the filter action to the filter.
func (f *ICMPFilter) SetAll(block bool) {
// WillBlock reports whether the ICMP type will be blocked.
func (f *ICMPFilter) WillBlock(typ ICMPType) bool {
return f.willBlock(typ)