45 lines
1.2 KiB
Go
45 lines
1.2 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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//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
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// +build aix 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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"golang.org/x/net/internal/socket"
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"golang.org/x/sys/unix"
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)
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func marshalDst(b []byte, cm *ControlMessage) []byte {
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m := socket.ControlMessage(b)
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m.MarshalHeader(iana.ProtocolIP, unix.IP_RECVDSTADDR, net.IPv4len)
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return m.Next(net.IPv4len)
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}
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func parseDst(cm *ControlMessage, b []byte) {
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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, b[:net.IPv4len])
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}
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func marshalInterface(b []byte, cm *ControlMessage) []byte {
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m := socket.ControlMessage(b)
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m.MarshalHeader(iana.ProtocolIP, sockoptReceiveInterface, syscall.SizeofSockaddrDatalink)
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return m.Next(syscall.SizeofSockaddrDatalink)
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}
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func parseInterface(cm *ControlMessage, b []byte) {
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var sadl syscall.SockaddrDatalink
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copy((*[unsafe.Sizeof(sadl)]byte)(unsafe.Pointer(&sadl))[:], b)
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cm.IfIndex = int(sadl.Index)
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}
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