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 | "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 | } |