1// Copyright 2013 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
6
7package ipv6
8
9import (
10	"unsafe"
11
12	"golang.org/x/net/internal/iana"
13	"golang.org/x/net/internal/socket"
14)
15
16func marshal2292HopLimit(b []byte, cm *ControlMessage) []byte {
17	m := socket.ControlMessage(b)
18	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_2292HOPLIMIT, 4)
19	if cm != nil {
20		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit))
21	}
22	return m.Next(4)
23}
24
25func marshal2292PacketInfo(b []byte, cm *ControlMessage) []byte {
26	m := socket.ControlMessage(b)
27	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_2292PKTINFO, sizeofInet6Pktinfo)
28	if cm != nil {
29		pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0]))
30		if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
31			copy(pi.Addr[:], ip)
32		}
33		if cm.IfIndex > 0 {
34			pi.setIfindex(cm.IfIndex)
35		}
36	}
37	return m.Next(sizeofInet6Pktinfo)
38}
39
40func marshal2292NextHop(b []byte, cm *ControlMessage) []byte {
41	m := socket.ControlMessage(b)
42	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_2292NEXTHOP, sizeofSockaddrInet6)
43	if cm != nil {
44		sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0]))
45		sa.setSockaddr(cm.NextHop, cm.IfIndex)
46	}
47	return m.Next(sizeofSockaddrInet6)
48}
49