sockoptip4_linux.mx raw

   1  // Copyright 2011 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 net
   6  
   7  import (
   8  	"runtime"
   9  	"syscall"
  10  )
  11  
  12  func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
  13  	mreq := &syscall.IPMreqn{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
  14  	if ifi != nil {
  15  		mreq.Ifindex = int32(ifi.Index)
  16  	}
  17  	err := fd.pfd.SetsockoptIPMreqn(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
  18  	runtime.KeepAlive(fd)
  19  	return wrapSyscallError("setsockopt", err)
  20  }
  21  
  22  func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
  23  	var v int32
  24  	if ifi != nil {
  25  		v = int32(ifi.Index)
  26  	}
  27  	mreq := &syscall.IPMreqn{Ifindex: v}
  28  	err := fd.pfd.SetsockoptIPMreqn(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
  29  	runtime.KeepAlive(fd)
  30  	return wrapSyscallError("setsockopt", err)
  31  }
  32  
  33  func setIPv4MulticastLoopback(fd *netFD, v bool) error {
  34  	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
  35  	runtime.KeepAlive(fd)
  36  	return wrapSyscallError("setsockopt", err)
  37  }
  38