sys_zos.go

Documentation: golang.org/x/net/ipv4

     1  // Copyright 2020 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  	"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  		ctlPacketInfo: {unix.IP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
    21  	}
    22  
    23  	sockOpts = map[int]*sockOpt{
    24  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
    25  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}},
    26  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 1}},
    27  		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVPKTINFO, Len: 4}},
    28  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    29  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    30  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    31  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    32  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    33  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    34  	}
    35  )
    36  
    37  func (pi *inetPktinfo) setIfindex(i int) {
    38  	pi.Ifindex = uint32(i)
    39  }
    40  
    41  func (gr *groupReq) setGroup(grp net.IP) {
    42  	sa := (*sockaddrInet4)(unsafe.Pointer(&gr.Group))
    43  	sa.Family = syscall.AF_INET
    44  	sa.Len = sizeofSockaddrInet4
    45  	copy(sa.Addr[:], grp)
    46  }
    47  
    48  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
    49  	sa := (*sockaddrInet4)(unsafe.Pointer(&gsr.Group))
    50  	sa.Family = syscall.AF_INET
    51  	sa.Len = sizeofSockaddrInet4
    52  	copy(sa.Addr[:], grp)
    53  	sa = (*sockaddrInet4)(unsafe.Pointer(&gsr.Source))
    54  	sa.Family = syscall.AF_INET
    55  	sa.Len = sizeofSockaddrInet4
    56  	copy(sa.Addr[:], src)
    57  }
    58
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