gitee.com/ks-custle/core-gm@v0.0.0-20230922171213-b83bdd97b62c/net/ipv4/icmp.go (about)

     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 ipv4
     6  
     7  import "gitee.com/ks-custle/core-gm/net/internal/iana"
     8  
     9  // An ICMPType represents a type of ICMP message.
    10  type ICMPType int
    11  
    12  func (typ ICMPType) String() string {
    13  	s, ok := icmpTypes[typ]
    14  	if !ok {
    15  		return "<nil>"
    16  	}
    17  	return s
    18  }
    19  
    20  // Protocol returns the ICMPv4 protocol number.
    21  func (typ ICMPType) Protocol() int {
    22  	return iana.ProtocolICMP
    23  }
    24  
    25  // An ICMPFilter represents an ICMP message filter for incoming
    26  // packets. The filter belongs to a packet delivery path on a host and
    27  // it cannot interact with forwarding packets or tunnel-outer packets.
    28  //
    29  // Note: RFC 8200 defines a reasonable role model and it works not
    30  // only for IPv6 but IPv4. A node means a device that implements IP.
    31  // A router means a node that forwards IP packets not explicitly
    32  // addressed to itself, and a host means a node that is not a router.
    33  type ICMPFilter struct {
    34  	icmpFilter
    35  }
    36  
    37  // Accept accepts incoming ICMP packets including the type field value
    38  // typ.
    39  func (f *ICMPFilter) Accept(typ ICMPType) {
    40  	f.accept(typ)
    41  }
    42  
    43  // Block blocks incoming ICMP packets including the type field value
    44  // typ.
    45  func (f *ICMPFilter) Block(typ ICMPType) {
    46  	f.block(typ)
    47  }
    48  
    49  // SetAll sets the filter action to the filter.
    50  func (f *ICMPFilter) SetAll(block bool) {
    51  	f.setAll(block)
    52  }
    53  
    54  // WillBlock reports whether the ICMP type will be blocked.
    55  func (f *ICMPFilter) WillBlock(typ ICMPType) bool {
    56  	return f.willBlock(typ)
    57  }