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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
package ipv4
import (
"net"
"syscall"
"unsafe"
"golang.org/x/net/internal/iana"
"golang.org/x/net/internal/socket"
"golang.org/x/sys/unix"
)
func marshalDst(b []byte, cm *ControlMessage) []byte {
m := socket.ControlMessage(b)
m.MarshalHeader(iana.ProtocolIP, unix.IP_RECVDSTADDR, net.IPv4len)
return m.Next(net.IPv4len)
}
func parseDst(cm *ControlMessage, b []byte) {
if len(cm.Dst) < net.IPv4len {
cm.Dst = make(net.IP, net.IPv4len)
}
copy(cm.Dst, b[:net.IPv4len])
}
func marshalInterface(b []byte, cm *ControlMessage) []byte {
m := socket.ControlMessage(b)
m.MarshalHeader(iana.ProtocolIP, sockoptReceiveInterface, syscall.SizeofSockaddrDatalink)
return m.Next(syscall.SizeofSockaddrDatalink)
}
func parseInterface(cm *ControlMessage, b []byte) {
var sadl syscall.SockaddrDatalink
copy((*[unsafe.Sizeof(sadl)]byte)(unsafe.Pointer(&sadl))[:], b)
cm.IfIndex = int(sadl.Index)
}
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