// 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 "golang.org/x/net/internal/iana" // 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 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 (f *ICMPFilter) Accept(typ ICMPType) { f.accept(typ) } // Block blocks incoming ICMP packets including the type field value // typ. func (f *ICMPFilter) Block(typ ICMPType) { f.block(typ) } // SetAll sets the filter action to the filter. func (f *ICMPFilter) SetAll(block bool) { f.setAll(block) } // WillBlock reports whether the ICMP type will be blocked. func (f *ICMPFilter) WillBlock(typ ICMPType) bool { return f.willBlock(typ) }