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39 lines
945 B
39 lines
945 B
// Copyright 2014 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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// +build darwin linux solaris |
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package ipv4 |
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import ( |
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"net" |
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"unsafe" |
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"golang.org/x/net/internal/iana" |
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"golang.org/x/net/internal/socket" |
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) |
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func marshalPacketInfo(b []byte, cm *ControlMessage) []byte { |
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m := socket.ControlMessage(b) |
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m.MarshalHeader(iana.ProtocolIP, sysIP_PKTINFO, sizeofInetPktinfo) |
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if cm != nil { |
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pi := (*inetPktinfo)(unsafe.Pointer(&m.Data(sizeofInetPktinfo)[0])) |
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if ip := cm.Src.To4(); ip != nil { |
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copy(pi.Spec_dst[:], ip) |
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} |
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if cm.IfIndex > 0 { |
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pi.setIfindex(cm.IfIndex) |
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} |
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} |
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return m.Next(sizeofInetPktinfo) |
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} |
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func parsePacketInfo(cm *ControlMessage, b []byte) { |
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pi := (*inetPktinfo)(unsafe.Pointer(&b[0])) |
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cm.IfIndex = int(pi.Ifindex) |
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if len(cm.Dst) < net.IPv4len { |
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cm.Dst = make(net.IP, net.IPv4len) |
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} |
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copy(cm.Dst, pi.Addr[:]) |
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}
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