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Source file src/syscall/lsf_linux.go

  // Copyright 2011 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // Linux socket filter
  
  package syscall
  
  import (
  	"unsafe"
  )
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func LsfStmt(code, k int) *SockFilter {
  	return &SockFilter{Code: uint16(code), K: uint32(k)}
  }
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func LsfJump(code, k, jt, jf int) *SockFilter {
  	return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
  }
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func LsfSocket(ifindex, proto int) (int, error) {
  	var lsall SockaddrLinklayer
  	s, e := Socket(AF_PACKET, SOCK_RAW, proto)
  	if e != nil {
  		return 0, e
  	}
  	p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
  	p[0] = byte(proto >> 8)
  	p[1] = byte(proto)
  	lsall.Ifindex = ifindex
  	e = Bind(s, &lsall)
  	if e != nil {
  		Close(s)
  		return 0, e
  	}
  	return s, nil
  }
  
  type iflags struct {
  	name  [IFNAMSIZ]byte
  	flags uint16
  }
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func SetLsfPromisc(name string, m bool) error {
  	s, e := Socket(AF_INET, SOCK_DGRAM, 0)
  	if e != nil {
  		return e
  	}
  	defer Close(s)
  	var ifl iflags
  	copy(ifl.name[:], []byte(name))
  	_, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  	if ep != 0 {
  		return Errno(ep)
  	}
  	if m {
  		ifl.flags |= uint16(IFF_PROMISC)
  	} else {
  		ifl.flags &^= uint16(IFF_PROMISC)
  	}
  	_, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  	if ep != 0 {
  		return Errno(ep)
  	}
  	return nil
  }
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func AttachLsf(fd int, i []SockFilter) error {
  	var p SockFprog
  	p.Len = uint16(len(i))
  	p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
  	return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), unsafe.Sizeof(p))
  }
  
  // Deprecated: Use golang.org/x/net/bpf instead.
  func DetachLsf(fd int) error {
  	var dummy int
  	return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), unsafe.Sizeof(dummy))
  }
  

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