diff options
| -rw-r--r-- | pkg/tcpip/network/arp/arp.go | 4 | ||||
| -rw-r--r-- | pkg/tcpip/network/ipv6/icmp.go | 20 | ||||
| -rw-r--r-- | pkg/tcpip/stack/nic.go | 2 | ||||
| -rw-r--r-- | pkg/tcpip/tcpip.go | 11 |
4 files changed, 24 insertions, 13 deletions
diff --git a/pkg/tcpip/network/arp/arp.go b/pkg/tcpip/network/arp/arp.go index 922181ac0..6b1e854dc 100644 --- a/pkg/tcpip/network/arp/arp.go +++ b/pkg/tcpip/network/arp/arp.go @@ -109,7 +109,11 @@ func (e *endpoint) HandlePacket(r *stack.Route, vv buffer.VectorisedView) { copy(pkt.HardwareAddressTarget(), h.HardwareAddressSender()) copy(pkt.ProtocolAddressTarget(), h.ProtocolAddressSender()) e.linkEP.WritePacket(r, nil /* gso */, hdr, buffer.VectorisedView{}, ProtocolNumber) + fallthrough // also fill the cache from requests case header.ARPReply: + addr := tcpip.Address(h.ProtocolAddressSender()) + linkAddr := tcpip.LinkAddress(h.HardwareAddressSender()) + e.linkAddrCache.AddLinkAddress(e.nicid, addr, linkAddr) } } diff --git a/pkg/tcpip/network/ipv6/icmp.go b/pkg/tcpip/network/ipv6/icmp.go index b5df85455..f543ceb92 100644 --- a/pkg/tcpip/network/ipv6/icmp.go +++ b/pkg/tcpip/network/ipv6/icmp.go @@ -121,7 +121,6 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, vv buffer.V case header.ICMPv6NeighborSolicit: received.NeighborSolicit.Increment() - if len(v) < header.ICMPv6NeighborSolicitMinimumSize { received.Invalid.Increment() return @@ -131,7 +130,6 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, vv buffer.V // We don't have a useful answer; the best we can do is ignore the request. return } - hdr := buffer.NewPrependable(int(r.MaxHeaderLength()) + header.ICMPv6NeighborAdvertSize) pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborAdvertSize)) pkt.SetType(header.ICMPv6NeighborAdvert) @@ -154,7 +152,22 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, vv buffer.V r.LocalAddress = targetAddr pkt.SetChecksum(header.ICMPv6Checksum(pkt, r.LocalAddress, r.RemoteAddress, buffer.VectorisedView{})) - if err := r.WritePacket(nil /* gso */, hdr, buffer.VectorisedView{}, stack.NetworkHeaderParams{Protocol: header.ICMPv6ProtocolNumber, TTL: r.DefaultTTL(), TOS: stack.DefaultTOS}); err != nil { + // TODO(tamird/ghanan): there exists an explicit NDP option that is + // used to update the neighbor table with link addresses for a + // neighbor from an NS (see the Source Link Layer option RFC + // 4861 section 4.6.1 and section 7.2.3). + // + // Furthermore, the entirety of NDP handling here seems to be + // contradicted by RFC 4861. + e.linkAddrCache.AddLinkAddress(e.nicid, r.RemoteAddress, r.RemoteLinkAddress) + + // RFC 4861 Neighbor Discovery for IP version 6 (IPv6) + // + // 7.1.2. Validation of Neighbor Advertisements + // + // The IP Hop Limit field has a value of 255, i.e., the packet + // could not possibly have been forwarded by a router. + if err := r.WritePacket(nil /* gso */, hdr, buffer.VectorisedView{}, stack.NetworkHeaderParams{Protocol: header.ICMPv6ProtocolNumber, TTL: ndpHopLimit, TOS: stack.DefaultTOS}); err != nil { sent.Dropped.Increment() return } @@ -178,7 +191,6 @@ func (e *endpoint) handleICMP(r *stack.Route, netHeader buffer.View, vv buffer.V received.Invalid.Increment() return } - vv.TrimFront(header.ICMPv6EchoMinimumSize) hdr := buffer.NewPrependable(int(r.MaxHeaderLength()) + header.ICMPv6EchoMinimumSize) pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6EchoMinimumSize)) diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go index 5993fe582..f64bbf6eb 100644 --- a/pkg/tcpip/stack/nic.go +++ b/pkg/tcpip/stack/nic.go @@ -632,8 +632,6 @@ func (n *NIC) DeliverNetworkPacket(linkEP LinkEndpoint, remote, _ tcpip.LinkAddr src, dst := netProto.ParseAddresses(vv.First()) - n.stack.AddLinkAddress(n.id, src, remote) - if ref := n.getRef(protocol, dst); ref != nil { handlePacket(protocol, dst, src, linkEP.LinkAddress(), remote, ref, vv) return diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go index 9d3752032..678a94616 100644 --- a/pkg/tcpip/tcpip.go +++ b/pkg/tcpip/tcpip.go @@ -1086,15 +1086,12 @@ func (*TransportEndpointStats) IsEndpointStats() {} func fillIn(v reflect.Value) { for i := 0; i < v.NumField(); i++ { v := v.Field(i) - switch v.Kind() { - case reflect.Ptr: - if s := v.Addr().Interface().(**StatCounter); *s == nil { - *s = &StatCounter{} + if s, ok := v.Addr().Interface().(**StatCounter); ok { + if *s == nil { + *s = new(StatCounter) } - case reflect.Struct: + } else { fillIn(v) - default: - panic(fmt.Sprintf("unexpected type %s", v.Type())) } } } |