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//go:build darwin
6// +build darwin
7
8package ipv6
9
10import (
11	"unsafe"
12
13	"golang.org/x/net/internal/iana"
14	"golang.org/x/net/internal/socket"
15
16	"golang.org/x/sys/unix"
17)
18
19func marshal2292HopLimit(b []byte, cm *ControlMessage) []byte {
20	m := socket.ControlMessage(b)
21	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292HOPLIMIT, 4)
22	if cm != nil {
23		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit))
24	}
25	return m.Next(4)
26}
27
28func marshal2292PacketInfo(b []byte, cm *ControlMessage) []byte {
29	m := socket.ControlMessage(b)
30	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292PKTINFO, sizeofInet6Pktinfo)
31	if cm != nil {
32		pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0]))
33		if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
34			copy(pi.Addr[:], ip)
35		}
36		if cm.IfIndex > 0 {
37			pi.setIfindex(cm.IfIndex)
38		}
39	}
40	return m.Next(sizeofInet6Pktinfo)
41}
42
43func marshal2292NextHop(b []byte, cm *ControlMessage) []byte {
44	m := socket.ControlMessage(b)
45	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292NEXTHOP, sizeofSockaddrInet6)
46	if cm != nil {
47		sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0]))
48		sa.setSockaddr(cm.NextHop, cm.IfIndex)
49	}
50	return m.Next(sizeofSockaddrInet6)
51}
52