vendor/golang.org/x/net/ipv4/sys_linux.go

   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 }