40 lines
1 KiB
Go
40 lines
1 KiB
Go
// Copyright 2012 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 dragonfly freebsd netbsd openbsd
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package ipv4
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import (
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"net"
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"syscall"
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"unsafe"
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"golang.org/x/net/internal/iana"
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)
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func marshalDst(b []byte, cm *ControlMessage) []byte {
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m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
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m.Level = iana.ProtocolIP
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m.Type = sysIP_RECVDSTADDR
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m.SetLen(syscall.CmsgLen(net.IPv4len))
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return b[syscall.CmsgSpace(net.IPv4len):]
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}
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func parseDst(cm *ControlMessage, b []byte) {
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cm.Dst = b[:net.IPv4len]
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}
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func marshalInterface(b []byte, cm *ControlMessage) []byte {
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m := (*syscall.Cmsghdr)(unsafe.Pointer(&b[0]))
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m.Level = iana.ProtocolIP
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m.Type = sysIP_RECVIF
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m.SetLen(syscall.CmsgLen(syscall.SizeofSockaddrDatalink))
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return b[syscall.CmsgSpace(syscall.SizeofSockaddrDatalink):]
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}
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func parseInterface(cm *ControlMessage, b []byte) {
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sadl := (*syscall.SockaddrDatalink)(unsafe.Pointer(&b[0]))
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cm.IfIndex = int(sadl.Index)
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}
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