ipv6: deduplicate socket option code

Change-Id: I836cdf68901dc77bc4c086cabd9d43fd033fbf1d
Reviewed-on: https://go-review.googlesource.com/27736
Reviewed-by: Ian Lance Taylor <[email protected]>
Run-TryBot: Mikio Hara <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: cixtor

ipv6/icmp_windows.go

@@ -4,10 +4,6 @@
 
 package ipv6
 
-type sysICMPv6Filter struct {
-	// TODO(mikio): implement this
-}
-
 func (f *sysICMPv6Filter) accept(typ ICMPType) {
 	// TODO(mikio): implement this
 }

ipv6/sockopt_asmreq_unix.go renamed to ipv6/sockopt_asmreq_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package ipv6
 

ipv6/sockopt_asmreq_windows.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package ipv6
 

ipv6/sockopt_unix.go renamed to ipv6/sockopt_posix.go

@@ -23,7 +23,9 @@ const (
 
 	sysSizeofSockaddrInet6 = 0x1c
 
-	sysSizeofIPv6Mreq = 0x14
+	sysSizeofIPv6Mreq     = 0x14
+	sysSizeofIPv6Mtuinfo  = 0x20
+	sysSizeofICMPv6Filter = 0
 )
 
 type sysSockaddrInet6 struct {
@@ -39,6 +41,15 @@ type sysIPv6Mreq struct {
 	Interface uint32
 }
 
+type sysIPv6Mtuinfo struct {
+	Addr sysSockaddrInet6
+	Mtu  uint32
+}
+
+type sysICMPv6Filter struct {
+	// TODO(mikio): implement this
+}
+
 var (
 	ctlOpts = [ctlMax]ctlOpt{}
 

ipv6/sockopt_windows.go

@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+package ipv6
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func getsockopt(s uintptr, level, name int, v unsafe.Pointer, l *uint32) error {
+	return syscall.Getsockopt(syscall.Handle(s), int32(level), int32(name), (*byte)(v), (*int32)(unsafe.Pointer(l)))
+}
+
+func setsockopt(s uintptr, level, name int, v unsafe.Pointer, l uint32) error {
+	return syscall.Setsockopt(syscall.Handle(s), int32(level), int32(name), (*byte)(v), int32(l))
+}