| 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 | // +build darwin dragonfly freebsd linux netbsd openbsd solaris |
| 6 | |
| 7 | package ipv6 |
| 8 | |
| 9 | import ( |
| 10 | "net" |
| 11 | "unsafe" |
| 12 | |
| 13 | "golang.org/x/net/internal/iana" |
| 14 | "golang.org/x/net/internal/socket" |
| 15 | ) |
| 16 | |
| 17 | func marshalTrafficClass(b []byte, cm *ControlMessage) []byte { |
| 18 | m := socket.ControlMessage(b) |
| 19 | m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_TCLASS, 4) |
| 20 | if cm != nil { |
| 21 | socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.TrafficClass)) |
| 22 | } |
| 23 | return m.Next(4) |
| 24 | } |
| 25 | |
| 26 | func parseTrafficClass(cm *ControlMessage, b []byte) { |
| 27 | cm.TrafficClass = int(socket.NativeEndian.Uint32(b[:4])) |
| 28 | } |
| 29 | |
| 30 | func marshalHopLimit(b []byte, cm *ControlMessage) []byte { |
| 31 | m := socket.ControlMessage(b) |
| 32 | m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_HOPLIMIT, 4) |
| 33 | if cm != nil { |
| 34 | socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit)) |
| 35 | } |
| 36 | return m.Next(4) |
| 37 | } |
| 38 | |
| 39 | func parseHopLimit(cm *ControlMessage, b []byte) { |
| 40 | cm.HopLimit = int(socket.NativeEndian.Uint32(b[:4])) |
| 41 | } |
| 42 | |
| 43 | func marshalPacketInfo(b []byte, cm *ControlMessage) []byte { |
| 44 | m := socket.ControlMessage(b) |
| 45 | m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_PKTINFO, sizeofInet6Pktinfo) |
| 46 | if cm != nil { |
| 47 | pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0])) |
| 48 | if ip := cm.Src.To16(); ip != nil && ip.To4() == nil { |
| 49 | copy(pi.Addr[:], ip) |
| 50 | } |
| 51 | if cm.IfIndex > 0 { |
| 52 | pi.setIfindex(cm.IfIndex) |
| 53 | } |
| 54 | } |
| 55 | return m.Next(sizeofInet6Pktinfo) |
| 56 | } |
| 57 | |
| 58 | func parsePacketInfo(cm *ControlMessage, b []byte) { |
| 59 | pi := (*inet6Pktinfo)(unsafe.Pointer(&b[0])) |
| 60 | if len(cm.Dst) < net.IPv6len { |
| 61 | cm.Dst = make(net.IP, net.IPv6len) |
| 62 | } |
| 63 | copy(cm.Dst, pi.Addr[:]) |
| 64 | cm.IfIndex = int(pi.Ifindex) |
| 65 | } |
| 66 | |
| 67 | func marshalNextHop(b []byte, cm *ControlMessage) []byte { |
| 68 | m := socket.ControlMessage(b) |
| 69 | m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_NEXTHOP, sizeofSockaddrInet6) |
| 70 | if cm != nil { |
| 71 | sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0])) |
| 72 | sa.setSockaddr(cm.NextHop, cm.IfIndex) |
| 73 | } |
| 74 | return m.Next(sizeofSockaddrInet6) |
| 75 | } |
| 76 | |
| 77 | func parseNextHop(cm *ControlMessage, b []byte) { |
| 78 | } |
| 79 | |
| 80 | func marshalPathMTU(b []byte, cm *ControlMessage) []byte { |
| 81 | m := socket.ControlMessage(b) |
| 82 | m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_PATHMTU, sizeofIPv6Mtuinfo) |
| 83 | return m.Next(sizeofIPv6Mtuinfo) |
| 84 | } |
| 85 | |
| 86 | func parsePathMTU(cm *ControlMessage, b []byte) { |
| 87 | mi := (*ipv6Mtuinfo)(unsafe.Pointer(&b[0])) |
| 88 | if len(cm.Dst) < net.IPv6len { |
| 89 | cm.Dst = make(net.IP, net.IPv6len) |
| 90 | } |
| 91 | copy(cm.Dst, mi.Addr.Addr[:]) |
| 92 | cm.IfIndex = int(mi.Addr.Scope_id) |
| 93 | cm.MTU = int(mi.Mtu) |
| 94 | } |