github.com/lianghucheng/zrddz@v0.0.0-20200923083010-c71f680932e2/src/golang.org/x/net/ipv4/sys_linux.go (about)

     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  
    16  var (
    17  	ctlOpts = [ctlMax]ctlOpt{
    18  		ctlTTL:        {sysIP_TTL, 1, marshalTTL, parseTTL},
    19  		ctlPacketInfo: {sysIP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
    20  	}
    21  
    22  	sockOpts = map[int]*sockOpt{
    23  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}},
    24  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}},
    25  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}},
    26  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn},
    27  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}},
    28  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}},
    29  		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_PKTINFO, Len: 4}},
    30  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}},
    31  		ssoICMPFilter:         {Option: socket.Option{Level: iana.ProtocolReserved, Name: sysICMP_FILTER, Len: sizeofICMPFilter}},
    32  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    33  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    34  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    35  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    36  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    37  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    38  		ssoAttachFilter:       {Option: socket.Option{Level: sysSOL_SOCKET, Name: sysSO_ATTACH_FILTER, Len: sizeofSockFprog}},
    39  	}
    40  )
    41  
    42  func (pi *inetPktinfo) setIfindex(i int) {
    43  	pi.Ifindex = int32(i)
    44  }
    45  
    46  func (gr *groupReq) setGroup(grp net.IP) {
    47  	sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
    48  	sa.Family = syscall.AF_INET
    49  	copy(sa.Addr[:], grp)
    50  }
    51  
    52  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
    53  	sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
    54  	sa.Family = syscall.AF_INET
    55  	copy(sa.Addr[:], grp)
    56  	sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
    57  	sa.Family = syscall.AF_INET
    58  	copy(sa.Addr[:], src)
    59  }