// 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 ( ICMPType) () string {
	,  := icmpTypes[]
	if ! {
		return "<nil>"
	}
	return 
}

// Protocol returns the ICMPv4 protocol number.
func ( ICMPType) () 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 8200 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 {
	icmpFilter
}

// Accept accepts incoming ICMP packets including the type field value
// typ.
func ( *ICMPFilter) ( ICMPType) {
	.accept()
}

// Block blocks incoming ICMP packets including the type field value
// typ.
func ( *ICMPFilter) ( ICMPType) {
	.block()
}

// SetAll sets the filter action to the filter.
func ( *ICMPFilter) ( bool) {
	.setAll()
}

// WillBlock reports whether the ICMP type will be blocked.
func ( *ICMPFilter) ( ICMPType) bool {
	return .willBlock()
}