sys_linux.go

Documentation: golang.org/x/net/ipv4

     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  	"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  		ctlTTL:        {unix.IP_TTL, 1, marshalTTL, parseTTL},
    21  		ctlPacketInfo: {unix.IP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
    22  	}
    23  
    24  	sockOpts = map[int]*sockOpt{
    25  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}},
    26  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}},
    27  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 4}},
    28  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn},
    29  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}},
    30  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}},
    31  		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_PKTINFO, Len: 4}},
    32  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}},
    33  		ssoICMPFilter:         {Option: socket.Option{Level: iana.ProtocolReserved, Name: unix.ICMP_FILTER, Len: sizeofICMPFilter}},
    34  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    35  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    36  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    37  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    38  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    39  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    40  		ssoAttachFilter:       {Option: socket.Option{Level: unix.SOL_SOCKET, Name: unix.SO_ATTACH_FILTER, Len: unix.SizeofSockFprog}},
    41  	}
    42  )
    43  
    44  func (pi *inetPktinfo) setIfindex(i int) {
    45  	pi.Ifindex = int32(i)
    46  }
    47  
    48  func (gr *groupReq) setGroup(grp net.IP) {
    49  	sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
    50  	sa.Family = syscall.AF_INET
    51  	copy(sa.Addr[:], grp)
    52  }
    53  
    54  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
    55  	sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
    56  	sa.Family = syscall.AF_INET
    57  	copy(sa.Addr[:], grp)
    58  	sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
    59  	sa.Family = syscall.AF_INET
    60  	copy(sa.Addr[:], src)
    61  }
    62
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