diff options
Diffstat (limited to 'test/packetimpact')
| -rw-r--r-- | test/packetimpact/tests/tcp_outside_the_window_test.go | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/packetimpact/tests/tcp_outside_the_window_test.go b/test/packetimpact/tests/tcp_outside_the_window_test.go index 1b041932a..8909a348e 100644 --- a/test/packetimpact/tests/tcp_outside_the_window_test.go +++ b/test/packetimpact/tests/tcp_outside_the_window_test.go @@ -84,6 +84,24 @@ func TestTCPOutsideTheWindow(t *testing.T) { if tt.expectACK && err != nil { t.Fatalf("expected an ACK packet within %s but got none: %s", timeout, err) } + // Data packets w/o SYN bits are always acked by Linux. Netstack ACK's data packets + // always right now. So only send a second segment and test for no ACK for packets + // with no data. + if tt.expectACK && tt.payload == nil { + // Sending another out-of-window segment immediately should not trigger + // an ACK if less than 500ms(default rate limit for out-of-window ACKs) + // has passed since the last ACK was sent. + t.Logf("sending another segment") + conn.Send(t, testbench.TCP{ + Flags: testbench.Uint8(tt.tcpFlags), + SeqNum: testbench.Uint32(uint32(conn.LocalSeqNum(t).Add(windowSize))), + }, tt.payload...) + timeout := 3 * time.Second + gotACK, err := conn.Expect(t, testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), AckNum: localSeqNum}, timeout) + if err == nil { + t.Fatalf("expected no ACK packet but got one: %s", gotACK) + } + } if !tt.expectACK && gotACK != nil { t.Fatalf("expected no ACK packet within %s but got one: %s", timeout, gotACK) } |