sys_freebsd.go raw

   1  // Copyright 2014 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  package ipv4
   6  
   7  import (
   8  	"net"
   9  	"runtime"
  10  	"strings"
  11  	"syscall"
  12  	"unsafe"
  13  
  14  	"golang.org/x/net/internal/iana"
  15  	"golang.org/x/net/internal/socket"
  16  
  17  	"golang.org/x/sys/unix"
  18  )
  19  
  20  const sockoptReceiveInterface = unix.IP_RECVIF
  21  
  22  var (
  23  	ctlOpts = [ctlMax]ctlOpt{
  24  		ctlTTL:       {unix.IP_RECVTTL, 1, marshalTTL, parseTTL},
  25  		ctlDst:       {unix.IP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
  26  		ctlInterface: {unix.IP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
  27  	}
  28  
  29  	sockOpts = map[int]*sockOpt{
  30  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}},
  31  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}},
  32  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
  33  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}},
  34  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}},
  35  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}},
  36  		ssoReceiveDst:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVDSTADDR, Len: 4}},
  37  		ssoReceiveInterface:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVIF, Len: 4}},
  38  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}},
  39  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  40  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  41  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  42  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  43  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  44  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  45  	}
  46  )
  47  
  48  func init() {
  49  	freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
  50  	if freebsdVersion >= 1000000 {
  51  		sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn}
  52  	}
  53  	if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" {
  54  		archs, _ := syscall.Sysctl("kern.supported_archs")
  55  		for _, s := range strings.Fields(archs) {
  56  			if s == "amd64" {
  57  				compatFreeBSD32 = true
  58  				break
  59  			}
  60  		}
  61  	}
  62  }
  63  
  64  func (gr *groupReq) setGroup(grp net.IP) {
  65  	sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
  66  	sa.Len = sizeofSockaddrInet
  67  	sa.Family = syscall.AF_INET
  68  	copy(sa.Addr[:], grp)
  69  }
  70  
  71  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
  72  	sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
  73  	sa.Len = sizeofSockaddrInet
  74  	sa.Family = syscall.AF_INET
  75  	copy(sa.Addr[:], grp)
  76  	sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
  77  	sa.Len = sizeofSockaddrInet
  78  	sa.Family = syscall.AF_INET
  79  	copy(sa.Addr[:], src)
  80  }
  81