1 // Copyright 2014 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.
5 // +build darwin linux solaris
13 "golang.org/x/net/internal/iana"
14 "golang.org/x/net/internal/socket"
17 func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
18 m := socket.ControlMessage(b)
19 m.MarshalHeader(iana.ProtocolIP, sysIP_PKTINFO, sizeofInetPktinfo)
21 pi := (*inetPktinfo)(unsafe.Pointer(&m.Data(sizeofInetPktinfo)[0]))
22 if ip := cm.Src.To4(); ip != nil {
23 copy(pi.Spec_dst[:], ip)
26 pi.setIfindex(cm.IfIndex)
29 return m.Next(sizeofInetPktinfo)
32 func parsePacketInfo(cm *ControlMessage, b []byte) {
33 pi := (*inetPktinfo)(unsafe.Pointer(&b[0]))
34 cm.IfIndex = int(pi.Ifindex)
35 if len(cm.Dst) < net.IPv4len {
36 cm.Dst = make(net.IP, net.IPv4len)
38 copy(cm.Dst, pi.Addr[:])