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icmp.go (1599B)

      1 // Copyright 2013 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package ipv6
      6 
      7 import "golang.org/x/net/internal/iana"
      8 
      9 // BUG(mikio): On Windows, methods related to ICMPFilter are not
     10 // implemented.
     11 
     12 // An ICMPType represents a type of ICMP message.
     13 type ICMPType int
     14 
     15 func (typ ICMPType) String() string {
     16 	s, ok := icmpTypes[typ]
     17 	if !ok {
     18 		return "<nil>"
     19 	}
     20 	return s
     21 }
     22 
     23 // Protocol returns the ICMPv6 protocol number.
     24 func (typ ICMPType) Protocol() int {
     25 	return iana.ProtocolIPv6ICMP
     26 }
     27 
     28 // An ICMPFilter represents an ICMP message filter for incoming
     29 // packets. The filter belongs to a packet delivery path on a host and
     30 // it cannot interact with forwarding packets or tunnel-outer packets.
     31 //
     32 // Note: RFC 8200 defines a reasonable role model. A node means a
     33 // device that implements IP. A router means a node that forwards IP
     34 // packets not explicitly addressed to itself, and a host means a node
     35 // that is not a router.
     36 type ICMPFilter struct {
     37 	icmpv6Filter
     38 }
     39 
     40 // Accept accepts incoming ICMP packets including the type field value
     41 // typ.
     42 func (f *ICMPFilter) Accept(typ ICMPType) {
     43 	f.accept(typ)
     44 }
     45 
     46 // Block blocks incoming ICMP packets including the type field value
     47 // typ.
     48 func (f *ICMPFilter) Block(typ ICMPType) {
     49 	f.block(typ)
     50 }
     51 
     52 // SetAll sets the filter action to the filter.
     53 func (f *ICMPFilter) SetAll(block bool) {
     54 	f.setAll(block)
     55 }
     56 
     57 // WillBlock reports whether the ICMP type will be blocked.
     58 func (f *ICMPFilter) WillBlock(typ ICMPType) bool {
     59 	return f.willBlock(typ)
     60 }