github.com/Andyfoo/golang/x/net@v0.0.0-20190901054642-57c1bf301704/ipv4/sys_bpf.go (about)

     1  // Copyright 2017 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  // +build linux
     6  
     7  package ipv4
     8  
     9  import (
    10  	"unsafe"
    11  
    12  	"github.com/Andyfoo/golang/x/net/bpf"
    13  	"github.com/Andyfoo/golang/x/net/internal/socket"
    14  )
    15  
    16  func (so *sockOpt) setAttachFilter(c *socket.Conn, f []bpf.RawInstruction) error {
    17  	prog := sockFProg{
    18  		Len:    uint16(len(f)),
    19  		Filter: (*sockFilter)(unsafe.Pointer(&f[0])),
    20  	}
    21  	b := (*[sizeofSockFprog]byte)(unsafe.Pointer(&prog))[:sizeofSockFprog]
    22  	return so.Set(c, b)
    23  }