| // Copyright 2014 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package ipv4 |
| |
| import ( |
| "net" |
| "strconv" |
| "strings" |
| "syscall" |
| "unsafe" |
| |
| "golang.org/x/net/internal/iana" |
| "golang.org/x/net/internal/socket" |
| ) |
| |
| var ( |
| ctlOpts = [ctlMax]ctlOpt{ |
| ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL}, |
| ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst}, |
| ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface}, |
| } |
| |
| sockOpts = map[int]*sockOpt{ |
| ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}}, |
| ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}}, |
| ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 1}}, |
| ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}}, |
| ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}}, |
| ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}}, |
| ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVDSTADDR, Len: 4}}, |
| ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVIF, Len: 4}}, |
| ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}}, |
| ssoStripHeader: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_STRIPHDR, Len: 4}}, |
| ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_ADD_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq}, |
| ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_DROP_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq}, |
| } |
| ) |
| |
| func init() { |
| // Seems like kern.osreldate is veiled on latest OS X. We use |
| // kern.osrelease instead. |
| s, err := syscall.Sysctl("kern.osrelease") |
| if err != nil { |
| return |
| } |
| ss := strings.Split(s, ".") |
| if len(ss) == 0 { |
| return |
| } |
| // The IP_PKTINFO and protocol-independent multicast API were |
| // introduced in OS X 10.7 (Darwin 11). But it looks like |
| // those features require OS X 10.8 (Darwin 12) or above. |
| // See http://support.apple.com/kb/HT1633. |
| if mjver, err := strconv.Atoi(ss[0]); err != nil || mjver < 12 { |
| return |
| } |
| ctlOpts[ctlPacketInfo].name = sysIP_PKTINFO |
| ctlOpts[ctlPacketInfo].length = sizeofInetPktinfo |
| ctlOpts[ctlPacketInfo].marshal = marshalPacketInfo |
| ctlOpts[ctlPacketInfo].parse = parsePacketInfo |
| sockOpts[ssoPacketInfo] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVPKTINFO, Len: 4}} |
| sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn} |
| sockOpts[ssoJoinGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq} |
| sockOpts[ssoLeaveGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq} |
| sockOpts[ssoJoinSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| sockOpts[ssoLeaveSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| sockOpts[ssoBlockSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| sockOpts[ssoUnblockSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| } |
| |
| func (pi *inetPktinfo) setIfindex(i int) { |
| pi.Ifindex = uint32(i) |
| } |
| |
| func (gr *groupReq) setGroup(grp net.IP) { |
| sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gr)) + 4)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], grp) |
| } |
| |
| func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { |
| sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 4)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], grp) |
| sa = (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 132)) |
| sa.Len = sizeofSockaddrInet |
| sa.Family = syscall.AF_INET |
| copy(sa.Addr[:], src) |
| } |