libgo/go/net/sockoptip_posix.go

   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 // +build darwin freebsd linux netbsd openbsd windows
   6
   7 package net
   8
   9 import (
  10         "os"
  11         "syscall"
  12 )
  13
  14 func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
  15         mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
  16         if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
  17                 return err
  18         }
  19         if err := fd.incref(false); err != nil {
  20                 return err
  21         }
  22         defer fd.decref()
  23         err := syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
  24         if err != nil {
  25                 return os.NewSyscallError("setsockopt", err)
  26         }
  27         return nil
  28 }
  29
  30 func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
  31         var v int
  32         if ifi != nil {
  33                 v = ifi.Index
  34         }
  35         if err := fd.incref(false); err != nil {
  36                 return err
  37         }
  38         defer fd.decref()
  39         err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
  40         if err != nil {
  41                 return os.NewSyscallError("setsockopt", err)
  42         }
  43         return nil
  44 }
  45
  46 func setIPv6MulticastLoopback(fd *netFD, v bool) error {
  47         if err := fd.incref(false); err != nil {
  48                 return err
  49         }
  50         defer fd.decref()
  51         err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
  52         if err != nil {
  53                 return os.NewSyscallError("setsockopt", err)
  54         }
  55         return nil
  56 }
  57
  58 func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
  59         mreq := &syscall.IPv6Mreq{}
  60         copy(mreq.Multiaddr[:], ip)
  61         if ifi != nil {
  62                 mreq.Interface = uint32(ifi.Index)
  63         }
  64         if err := fd.incref(false); err != nil {
  65                 return err
  66         }
  67         defer fd.decref()
  68         err := syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
  69         if err != nil {
  70                 return os.NewSyscallError("setsockopt", err)
  71         }
  72         return nil
  73 }