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control_bsd.go (1190B)

      1 // Copyright 2012 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.
      4 
      5 //go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
      6 // +build aix darwin dragonfly freebsd netbsd openbsd
      7 
      8 package ipv4
      9 
     10 import (
     11 	"net"
     12 	"syscall"
     13 	"unsafe"
     14 
     15 	"golang.org/x/net/internal/iana"
     16 	"golang.org/x/net/internal/socket"
     17 
     18 	"golang.org/x/sys/unix"
     19 )
     20 
     21 func marshalDst(b []byte, cm *ControlMessage) []byte {
     22 	m := socket.ControlMessage(b)
     23 	m.MarshalHeader(iana.ProtocolIP, unix.IP_RECVDSTADDR, net.IPv4len)
     24 	return m.Next(net.IPv4len)
     25 }
     26 
     27 func parseDst(cm *ControlMessage, b []byte) {
     28 	if len(cm.Dst) < net.IPv4len {
     29 		cm.Dst = make(net.IP, net.IPv4len)
     30 	}
     31 	copy(cm.Dst, b[:net.IPv4len])
     32 }
     33 
     34 func marshalInterface(b []byte, cm *ControlMessage) []byte {
     35 	m := socket.ControlMessage(b)
     36 	m.MarshalHeader(iana.ProtocolIP, sockoptReceiveInterface, syscall.SizeofSockaddrDatalink)
     37 	return m.Next(syscall.SizeofSockaddrDatalink)
     38 }
     39 
     40 func parseInterface(cm *ControlMessage, b []byte) {
     41 	var sadl syscall.SockaddrDatalink
     42 	copy((*[unsafe.Sizeof(sadl)]byte)(unsafe.Pointer(&sadl))[:], b)
     43 	cm.IfIndex = int(sadl.Index)
     44 }