github.com/binkynet/BinkyNet@v1.12.1-0.20240421190447-da4e34c20be0/proto_vendor/golang.org/x/net/ipv4/control_bsd.go (about)

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