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 //go:build aix || darwin || dragonfly || freebsd || hurd || linux || netbsd || openbsd || solaris || windows
   6
   7 package net
   8
   9 import (
  10         "runtime"
  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         err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)
  20         runtime.KeepAlive(fd)
  21         return wrapSyscallError("setsockopt", err)
  22 }
  23
  24 func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
  25         var v int
  26         if ifi != nil {
  27                 v = ifi.Index
  28         }
  29         err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
  30         runtime.KeepAlive(fd)
  31         return wrapSyscallError("setsockopt", err)
  32 }
  33
  34 func setIPv6MulticastLoopback(fd *netFD, v bool) error {
  35         err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
  36         runtime.KeepAlive(fd)
  37         return wrapSyscallError("setsockopt", err)
  38 }
  39
  40 func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
  41         mreq := &syscall.IPv6Mreq{}
  42         copy(mreq.Multiaddr[:], ip)
  43         if ifi != nil {
  44                 mreq.Interface = uint32(ifi.Index)
  45         }
  46         err := fd.pfd.SetsockoptIPv6Mreq(syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq)
  47         runtime.KeepAlive(fd)
  48         return wrapSyscallError("setsockopt", err)
  49 }