sys_linux.go raw

   1  // Copyright 2013 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 ipv6
   6  
   7  import (
   8  	"net"
   9  	"syscall"
  10  	"unsafe"
  11  
  12  	"golang.org/x/net/internal/iana"
  13  	"golang.org/x/net/internal/socket"
  14  
  15  	"golang.org/x/sys/unix"
  16  )
  17  
  18  var (
  19  	ctlOpts = [ctlMax]ctlOpt{
  20  		ctlTrafficClass: {unix.IPV6_TCLASS, 4, marshalTrafficClass, parseTrafficClass},
  21  		ctlHopLimit:     {unix.IPV6_HOPLIMIT, 4, marshalHopLimit, parseHopLimit},
  22  		ctlPacketInfo:   {unix.IPV6_PKTINFO, sizeofInet6Pktinfo, marshalPacketInfo, parsePacketInfo},
  23  		ctlPathMTU:      {unix.IPV6_PATHMTU, sizeofIPv6Mtuinfo, marshalPathMTU, parsePathMTU},
  24  	}
  25  
  26  	sockOpts = map[int]*sockOpt{
  27  		ssoTrafficClass:        {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_TCLASS, Len: 4}},
  28  		ssoHopLimit:            {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_UNICAST_HOPS, Len: 4}},
  29  		ssoMulticastInterface:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_IF, Len: 4}},
  30  		ssoMulticastHopLimit:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_HOPS, Len: 4}},
  31  		ssoMulticastLoopback:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_LOOP, Len: 4}},
  32  		ssoReceiveTrafficClass: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVTCLASS, Len: 4}},
  33  		ssoReceiveHopLimit:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVHOPLIMIT, Len: 4}},
  34  		ssoReceivePacketInfo:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVPKTINFO, Len: 4}},
  35  		ssoReceivePathMTU:      {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVPATHMTU, Len: 4}},
  36  		ssoPathMTU:             {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_PATHMTU, Len: sizeofIPv6Mtuinfo}},
  37  		ssoChecksum:            {Option: socket.Option{Level: iana.ProtocolReserved, Name: unix.IPV6_CHECKSUM, Len: 4}},
  38  		ssoICMPFilter:          {Option: socket.Option{Level: iana.ProtocolIPv6ICMP, Name: unix.ICMPV6_FILTER, Len: sizeofICMPv6Filter}},
  39  		ssoJoinGroup:           {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  40  		ssoLeaveGroup:          {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  41  		ssoJoinSourceGroup:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  42  		ssoLeaveSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  43  		ssoBlockSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  44  		ssoUnblockSourceGroup:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  45  		ssoAttachFilter:        {Option: socket.Option{Level: unix.SOL_SOCKET, Name: unix.SO_ATTACH_FILTER, Len: unix.SizeofSockFprog}},
  46  	}
  47  )
  48  
  49  func (sa *sockaddrInet6) setSockaddr(ip net.IP, i int) {
  50  	sa.Family = syscall.AF_INET6
  51  	copy(sa.Addr[:], ip)
  52  	sa.Scope_id = uint32(i)
  53  }
  54  
  55  func (pi *inet6Pktinfo) setIfindex(i int) {
  56  	pi.Ifindex = int32(i)
  57  }
  58  
  59  func (mreq *ipv6Mreq) setIfindex(i int) {
  60  	mreq.Ifindex = int32(i)
  61  }
  62  
  63  func (gr *groupReq) setGroup(grp net.IP) {
  64  	sa := (*sockaddrInet6)(unsafe.Pointer(&gr.Group))
  65  	sa.Family = syscall.AF_INET6
  66  	copy(sa.Addr[:], grp)
  67  }
  68  
  69  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
  70  	sa := (*sockaddrInet6)(unsafe.Pointer(&gsr.Group))
  71  	sa.Family = syscall.AF_INET6
  72  	copy(sa.Addr[:], grp)
  73  	sa = (*sockaddrInet6)(unsafe.Pointer(&gsr.Source))
  74  	sa.Family = syscall.AF_INET6
  75  	copy(sa.Addr[:], src)
  76  }
  77