| // 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) |
| } |