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57 lines
1.5 KiB
57 lines
1.5 KiB
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv4
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import "golang.org/x/net/internal/iana"
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// An ICMPType represents a type of ICMP message.
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type ICMPType int
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func (typ ICMPType) String() string {
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s, ok := icmpTypes[typ]
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if !ok {
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return "<nil>"
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}
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return s
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}
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// Protocol returns the ICMPv4 protocol number.
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func (typ ICMPType) Protocol() int {
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return iana.ProtocolICMP
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}
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// An ICMPFilter represents an ICMP message filter for incoming
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// packets. The filter belongs to a packet delivery path on a host and
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// it cannot interact with forwarding packets or tunnel-outer packets.
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//
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// Note: RFC 8200 defines a reasonable role model and it works not
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// only for IPv6 but IPv4. A node means a device that implements IP.
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// A router means a node that forwards IP packets not explicitly
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// addressed to itself, and a host means a node that is not a router.
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type ICMPFilter struct {
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icmpFilter
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}
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// Accept accepts incoming ICMP packets including the type field value
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// typ.
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func (f *ICMPFilter) Accept(typ ICMPType) {
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f.accept(typ)
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}
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// Block blocks incoming ICMP packets including the type field value
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// typ.
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func (f *ICMPFilter) Block(typ ICMPType) {
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f.block(typ)
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}
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// SetAll sets the filter action to the filter.
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func (f *ICMPFilter) SetAll(block bool) {
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f.setAll(block)
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}
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// WillBlock reports whether the ICMP type will be blocked.
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func (f *ICMPFilter) WillBlock(typ ICMPType) bool {
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return f.willBlock(typ)
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}
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