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 aix darwin dragonfly 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(); err != nil {
  20                 return err
  21         }
  22         defer fd.decref()
  23         return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq))
  24 }
  25
  26 func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
  27         var v int
  28         if ifi != nil {
  29                 v = ifi.Index
  30         }
  31         if err := fd.incref(); err != nil {
  32                 return err
  33         }
  34         defer fd.decref()
  35         return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v))
  36 }
  37
  38 func setIPv6MulticastLoopback(fd *netFD, v bool) error {
  39         if err := fd.incref(); err != nil {
  40                 return err
  41         }
  42         defer fd.decref()
  43         return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v)))
  44 }
  45
  46 func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
  47         mreq := &syscall.IPv6Mreq{}
  48         copy(mreq.Multiaddr[:], ip)
  49         if ifi != nil {
  50                 mreq.Interface = uint32(ifi.Index)
  51         }
  52         if err := fd.incref(); err != nil {
  53                 return err
  54         }
  55         defer fd.decref()
  56         return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq))
  57 }