David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2013 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 ipv6 |
| 6 | |
| 7 | import ( |
| 8 | "net" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | "syscall" |
| 12 | "unsafe" |
| 13 | |
| 14 | "golang.org/x/net/internal/iana" |
| 15 | "golang.org/x/net/internal/socket" |
| 16 | ) |
| 17 | |
| 18 | var ( |
| 19 | ctlOpts = [ctlMax]ctlOpt{ |
| 20 | ctlHopLimit: {sysIPV6_2292HOPLIMIT, 4, marshal2292HopLimit, parseHopLimit}, |
| 21 | ctlPacketInfo: {sysIPV6_2292PKTINFO, sizeofInet6Pktinfo, marshal2292PacketInfo, parsePacketInfo}, |
| 22 | } |
| 23 | |
| 24 | sockOpts = map[int]*sockOpt{ |
| 25 | ssoHopLimit: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_UNICAST_HOPS, Len: 4}}, |
| 26 | ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_IF, Len: 4}}, |
| 27 | ssoMulticastHopLimit: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_HOPS, Len: 4}}, |
| 28 | ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_LOOP, Len: 4}}, |
| 29 | ssoReceiveHopLimit: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_2292HOPLIMIT, Len: 4}}, |
| 30 | ssoReceivePacketInfo: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_2292PKTINFO, Len: 4}}, |
| 31 | ssoChecksum: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_CHECKSUM, Len: 4}}, |
| 32 | ssoICMPFilter: {Option: socket.Option{Level: iana.ProtocolIPv6ICMP, Name: sysICMP6_FILTER, Len: sizeofICMPv6Filter}}, |
| 33 | ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_JOIN_GROUP, Len: sizeofIPv6Mreq}, typ: ssoTypeIPMreq}, |
| 34 | ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_LEAVE_GROUP, Len: sizeofIPv6Mreq}, typ: ssoTypeIPMreq}, |
| 35 | } |
| 36 | ) |
| 37 | |
| 38 | func init() { |
| 39 | // Seems like kern.osreldate is veiled on latest OS X. We use |
| 40 | // kern.osrelease instead. |
| 41 | s, err := syscall.Sysctl("kern.osrelease") |
| 42 | if err != nil { |
| 43 | return |
| 44 | } |
| 45 | ss := strings.Split(s, ".") |
| 46 | if len(ss) == 0 { |
| 47 | return |
| 48 | } |
| 49 | // The IP_PKTINFO and protocol-independent multicast API were |
| 50 | // introduced in OS X 10.7 (Darwin 11). But it looks like |
| 51 | // those features require OS X 10.8 (Darwin 12) or above. |
| 52 | // See http://support.apple.com/kb/HT1633. |
| 53 | if mjver, err := strconv.Atoi(ss[0]); err != nil || mjver < 12 { |
| 54 | return |
| 55 | } |
| 56 | ctlOpts[ctlTrafficClass] = ctlOpt{sysIPV6_TCLASS, 4, marshalTrafficClass, parseTrafficClass} |
| 57 | ctlOpts[ctlHopLimit] = ctlOpt{sysIPV6_HOPLIMIT, 4, marshalHopLimit, parseHopLimit} |
| 58 | ctlOpts[ctlPacketInfo] = ctlOpt{sysIPV6_PKTINFO, sizeofInet6Pktinfo, marshalPacketInfo, parsePacketInfo} |
| 59 | ctlOpts[ctlNextHop] = ctlOpt{sysIPV6_NEXTHOP, sizeofSockaddrInet6, marshalNextHop, parseNextHop} |
| 60 | ctlOpts[ctlPathMTU] = ctlOpt{sysIPV6_PATHMTU, sizeofIPv6Mtuinfo, marshalPathMTU, parsePathMTU} |
| 61 | sockOpts[ssoTrafficClass] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_TCLASS, Len: 4}} |
| 62 | sockOpts[ssoReceiveTrafficClass] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVTCLASS, Len: 4}} |
| 63 | sockOpts[ssoReceiveHopLimit] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVHOPLIMIT, Len: 4}} |
| 64 | sockOpts[ssoReceivePacketInfo] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVPKTINFO, Len: 4}} |
| 65 | sockOpts[ssoReceivePathMTU] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVPATHMTU, Len: 4}} |
| 66 | sockOpts[ssoPathMTU] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_PATHMTU, Len: sizeofIPv6Mtuinfo}} |
| 67 | sockOpts[ssoJoinGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq} |
| 68 | sockOpts[ssoLeaveGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq} |
| 69 | sockOpts[ssoJoinSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| 70 | sockOpts[ssoLeaveSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| 71 | sockOpts[ssoBlockSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| 72 | sockOpts[ssoUnblockSourceGroup] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq} |
| 73 | } |
| 74 | |
| 75 | func (sa *sockaddrInet6) setSockaddr(ip net.IP, i int) { |
| 76 | sa.Len = sizeofSockaddrInet6 |
| 77 | sa.Family = syscall.AF_INET6 |
| 78 | copy(sa.Addr[:], ip) |
| 79 | sa.Scope_id = uint32(i) |
| 80 | } |
| 81 | |
| 82 | func (pi *inet6Pktinfo) setIfindex(i int) { |
| 83 | pi.Ifindex = uint32(i) |
| 84 | } |
| 85 | |
| 86 | func (mreq *ipv6Mreq) setIfindex(i int) { |
| 87 | mreq.Interface = uint32(i) |
| 88 | } |
| 89 | |
| 90 | func (gr *groupReq) setGroup(grp net.IP) { |
| 91 | sa := (*sockaddrInet6)(unsafe.Pointer(uintptr(unsafe.Pointer(gr)) + 4)) |
| 92 | sa.Len = sizeofSockaddrInet6 |
| 93 | sa.Family = syscall.AF_INET6 |
| 94 | copy(sa.Addr[:], grp) |
| 95 | } |
| 96 | |
| 97 | func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { |
| 98 | sa := (*sockaddrInet6)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 4)) |
| 99 | sa.Len = sizeofSockaddrInet6 |
| 100 | sa.Family = syscall.AF_INET6 |
| 101 | copy(sa.Addr[:], grp) |
| 102 | sa = (*sockaddrInet6)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 132)) |
| 103 | sa.Len = sizeofSockaddrInet6 |
| 104 | sa.Family = syscall.AF_INET6 |
| 105 | copy(sa.Addr[:], src) |
| 106 | } |