diff options
| -rw-r--r-- | pkg/tcpip/stack/ndp.go | 2 | ||||
| -rw-r--r-- | pkg/tcpip/stack/ndp_test.go | 78 |
2 files changed, 68 insertions, 12 deletions
diff --git a/pkg/tcpip/stack/ndp.go b/pkg/tcpip/stack/ndp.go index 19bd05aa3..f651871ce 100644 --- a/pkg/tcpip/stack/ndp.go +++ b/pkg/tcpip/stack/ndp.go @@ -1235,7 +1235,7 @@ func (ndp *ndpState) startSolicitingRouters() { } payloadSize := header.ICMPv6HeaderSize + header.NDPRSMinimumSize - hdr := buffer.NewPrependable(header.IPv6MinimumSize + payloadSize) + hdr := buffer.NewPrependable(int(r.MaxHeaderLength()) + payloadSize) pkt := header.ICMPv6(hdr.Prepend(payloadSize)) pkt.SetType(header.ICMPv6RouterSolicit) pkt.SetChecksum(header.ICMPv6Checksum(pkt, r.LocalAddress, r.RemoteAddress, buffer.VectorisedView{})) diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go index f7b75b74e..6e9306d09 100644 --- a/pkg/tcpip/stack/ndp_test.go +++ b/pkg/tcpip/stack/ndp_test.go @@ -267,6 +267,17 @@ func (n *ndpDispatcher) OnDHCPv6Configuration(nicID tcpip.NICID, configuration s } } +// channelLinkWithHeaderLength is a channel.Endpoint with a configurable +// header length. +type channelLinkWithHeaderLength struct { + *channel.Endpoint + headerLength uint16 +} + +func (l *channelLinkWithHeaderLength) MaxHeaderLength() uint16 { + return l.headerLength +} + // Check e to make sure that the event is for addr on nic with ID 1, and the // resolved flag set to resolved with the specified err. func checkDADEvent(e ndpDADEvent, nicID tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) string { @@ -323,21 +334,46 @@ func TestDADDisabled(t *testing.T) { // DAD for various values of DupAddrDetectTransmits and RetransmitTimer. // Included in the subtests is a test to make sure that an invalid // RetransmitTimer (<1ms) values get fixed to the default RetransmitTimer of 1s. +// This tests also validates the NDP NS packet that is transmitted. func TestDADResolve(t *testing.T) { const nicID = 1 tests := []struct { name string + linkHeaderLen uint16 dupAddrDetectTransmits uint8 retransTimer time.Duration expectedRetransmitTimer time.Duration }{ - {"1:1s:1s", 1, time.Second, time.Second}, - {"2:1s:1s", 2, time.Second, time.Second}, - {"1:2s:2s", 1, 2 * time.Second, 2 * time.Second}, + { + name: "1:1s:1s", + dupAddrDetectTransmits: 1, + retransTimer: time.Second, + expectedRetransmitTimer: time.Second, + }, + { + name: "2:1s:1s", + linkHeaderLen: 1, + dupAddrDetectTransmits: 2, + retransTimer: time.Second, + expectedRetransmitTimer: time.Second, + }, + { + name: "1:2s:2s", + linkHeaderLen: 2, + dupAddrDetectTransmits: 1, + retransTimer: 2 * time.Second, + expectedRetransmitTimer: 2 * time.Second, + }, // 0s is an invalid RetransmitTimer timer and will be fixed to // the default RetransmitTimer value of 1s. - {"1:0s:1s", 1, 0, time.Second}, + { + name: "1:0s:1s", + linkHeaderLen: 3, + dupAddrDetectTransmits: 1, + retransTimer: 0, + expectedRetransmitTimer: time.Second, + }, } for _, test := range tests { @@ -356,10 +392,13 @@ func TestDADResolve(t *testing.T) { opts.NDPConfigs.RetransmitTimer = test.retransTimer opts.NDPConfigs.DupAddrDetectTransmits = test.dupAddrDetectTransmits - e := channel.New(int(test.dupAddrDetectTransmits), 1280, linkAddr1) - e.LinkEPCapabilities |= stack.CapabilityResolutionRequired + e := channelLinkWithHeaderLength{ + Endpoint: channel.New(int(test.dupAddrDetectTransmits), 1280, linkAddr1), + headerLength: test.linkHeaderLen, + } + e.Endpoint.LinkEPCapabilities |= stack.CapabilityResolutionRequired s := stack.New(opts) - if err := s.CreateNIC(nicID, e); err != nil { + if err := s.CreateNIC(nicID, &e); err != nil { t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } @@ -445,6 +484,10 @@ func TestDADResolve(t *testing.T) { checker.NDPNSTargetAddress(addr1), checker.NDPNSOptions(nil), )) + + if l, want := p.Pkt.Header.AvailableLength(), int(test.linkHeaderLen); l != want { + t.Errorf("got p.Pkt.Header.AvailableLength() = %d; want = %d", l, want) + } } }) } @@ -3336,8 +3379,11 @@ func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { func TestRouterSolicitation(t *testing.T) { t.Parallel() + const nicID = 1 + tests := []struct { name string + linkHeaderLen uint16 maxRtrSolicit uint8 rtrSolicitInt time.Duration effectiveRtrSolicitInt time.Duration @@ -3354,6 +3400,7 @@ func TestRouterSolicitation(t *testing.T) { }, { name: "Two RS with delay", + linkHeaderLen: 1, maxRtrSolicit: 2, rtrSolicitInt: time.Second, effectiveRtrSolicitInt: time.Second, @@ -3362,6 +3409,7 @@ func TestRouterSolicitation(t *testing.T) { }, { name: "Single RS without delay", + linkHeaderLen: 2, maxRtrSolicit: 1, rtrSolicitInt: time.Second, effectiveRtrSolicitInt: time.Second, @@ -3370,6 +3418,7 @@ func TestRouterSolicitation(t *testing.T) { }, { name: "Two RS without delay and invalid zero interval", + linkHeaderLen: 3, maxRtrSolicit: 2, rtrSolicitInt: 0, effectiveRtrSolicitInt: 4 * time.Second, @@ -3407,8 +3456,11 @@ func TestRouterSolicitation(t *testing.T) { t.Run(test.name, func(t *testing.T) { t.Parallel() - e := channel.New(int(test.maxRtrSolicit), 1280, linkAddr1) - e.LinkEPCapabilities |= stack.CapabilityResolutionRequired + e := channelLinkWithHeaderLength{ + Endpoint: channel.New(int(test.maxRtrSolicit), 1280, linkAddr1), + headerLength: test.linkHeaderLen, + } + e.Endpoint.LinkEPCapabilities |= stack.CapabilityResolutionRequired waitForPkt := func(timeout time.Duration) { t.Helper() ctx, _ := context.WithTimeout(context.Background(), timeout) @@ -3434,6 +3486,10 @@ func TestRouterSolicitation(t *testing.T) { checker.TTL(header.NDPHopLimit), checker.NDPRS(), ) + + if l, want := p.Pkt.Header.AvailableLength(), int(test.linkHeaderLen); l != want { + t.Errorf("got p.Pkt.Header.AvailableLength() = %d; want = %d", l, want) + } } waitForNothing := func(timeout time.Duration) { t.Helper() @@ -3450,8 +3506,8 @@ func TestRouterSolicitation(t *testing.T) { MaxRtrSolicitationDelay: test.maxRtrSolicitDelay, }, }) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) + if err := s.CreateNIC(nicID, &e); err != nil { + t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) } // Make sure each RS got sent at the right |