github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/ipv4/icmp_linux.go (about)

     1  // Copyright 2014 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  func (f *icmpFilter) accept(typ ICMPType) {
     8  	f.Data &^= 1 << (uint32(typ) & 31)
     9  }
    10  
    11  func (f *icmpFilter) block(typ ICMPType) {
    12  	f.Data |= 1 << (uint32(typ) & 31)
    13  }
    14  
    15  func (f *icmpFilter) setAll(block bool) {
    16  	if block {
    17  		f.Data = 1<<32 - 1
    18  	} else {
    19  		f.Data = 0
    20  	}
    21  }
    22  
    23  func (f *icmpFilter) willBlock(typ ICMPType) bool {
    24  	return f.Data&(1<<(uint32(typ)&31)) != 0
    25  }