David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 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 | "golang.org/x/net/internal/iana" |
| 9 | "golang.org/x/net/internal/socket" |
| 10 | ) |
| 11 | |
| 12 | const ( |
| 13 | // See ws2tcpip.h. |
| 14 | sysIP_OPTIONS = 0x1 |
| 15 | sysIP_HDRINCL = 0x2 |
| 16 | sysIP_TOS = 0x3 |
| 17 | sysIP_TTL = 0x4 |
| 18 | sysIP_MULTICAST_IF = 0x9 |
| 19 | sysIP_MULTICAST_TTL = 0xa |
| 20 | sysIP_MULTICAST_LOOP = 0xb |
| 21 | sysIP_ADD_MEMBERSHIP = 0xc |
| 22 | sysIP_DROP_MEMBERSHIP = 0xd |
| 23 | sysIP_DONTFRAGMENT = 0xe |
| 24 | sysIP_ADD_SOURCE_MEMBERSHIP = 0xf |
| 25 | sysIP_DROP_SOURCE_MEMBERSHIP = 0x10 |
| 26 | sysIP_PKTINFO = 0x13 |
| 27 | |
| 28 | sizeofInetPktinfo = 0x8 |
| 29 | sizeofIPMreq = 0x8 |
| 30 | sizeofIPMreqSource = 0xc |
| 31 | ) |
| 32 | |
| 33 | type inetPktinfo struct { |
| 34 | Addr [4]byte |
| 35 | Ifindex int32 |
| 36 | } |
| 37 | |
| 38 | type ipMreq struct { |
| 39 | Multiaddr [4]byte |
| 40 | Interface [4]byte |
| 41 | } |
| 42 | |
| 43 | type ipMreqSource struct { |
| 44 | Multiaddr [4]byte |
| 45 | Sourceaddr [4]byte |
| 46 | Interface [4]byte |
| 47 | } |
| 48 | |
| 49 | // See http://msdn.microsoft.com/en-us/library/windows/desktop/ms738586(v=vs.85).aspx |
| 50 | var ( |
| 51 | ctlOpts = [ctlMax]ctlOpt{} |
| 52 | |
| 53 | sockOpts = map[int]*sockOpt{ |
| 54 | ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}}, |
| 55 | ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}}, |
| 56 | ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}}, |
| 57 | ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}}, |
| 58 | ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}}, |
| 59 | ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}}, |
| 60 | ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_ADD_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq}, |
| 61 | ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_DROP_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq}, |
| 62 | } |
| 63 | ) |
| 64 | |
| 65 | func (pi *inetPktinfo) setIfindex(i int) { |
| 66 | pi.Ifindex = int32(i) |
| 67 | } |