diff options
| author | Kevin Krakauer <krakauer@google.com> | 2021-06-21 12:34:56 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-06-21 12:37:51 -0700 |
| commit | 45cd7c1b1174dbeaebc1b52e20cb89927fb115ae (patch) | |
| tree | 31cc839c9191cc8d0dbd8cd4f013d8034499bde2 /pkg/tcpip | |
| parent | d823b7bd975dd2926324971a08f97522b41dd6e7 (diff) | |
netstack: don't ACK SYNs in TIME-WAIT
It was possible for a SYN to arrive after the endpoint sent an ACK as part of
the transition to TIME-WAIT, but before returning from handleSegmentsLocked().
This caused the SYN to be dequeued and ACK'd despite the change in
EndpointState.
Deflakes TestTCPTimeWaitNewSyn.
Tested with:
blaze test --config=gotsan --runs_per_test 10000 \
//third_party/gvisor/pkg/tcpip/transport/tcp:tcp_x_test -j 2000 \
// --test_filter TestTCPTimeWaitNewSyn
PiperOrigin-RevId: 380639808
Diffstat (limited to 'pkg/tcpip')
| -rw-r--r-- | pkg/tcpip/transport/tcp/connect.go | 2 | ||||
| -rw-r--r-- | pkg/tcpip/transport/tcp/rcv.go | 1 |
2 files changed, 1 insertions, 2 deletions
diff --git a/pkg/tcpip/transport/tcp/connect.go b/pkg/tcpip/transport/tcp/connect.go index 2137ebc25..f86450298 100644 --- a/pkg/tcpip/transport/tcp/connect.go +++ b/pkg/tcpip/transport/tcp/connect.go @@ -1130,7 +1130,7 @@ func (e *endpoint) handleReset(s *segment) (ok bool, err tcpip.Error) { func (e *endpoint) handleSegmentsLocked(fastPath bool) tcpip.Error { checkRequeue := true for i := 0; i < maxSegmentsPerWake; i++ { - if e.EndpointState().closed() { + if state := e.EndpointState(); state.closed() || state == StateTimeWait { return nil } s := e.segmentQueue.dequeue() diff --git a/pkg/tcpip/transport/tcp/rcv.go b/pkg/tcpip/transport/tcp/rcv.go index 661ca604a..9ce8fcae9 100644 --- a/pkg/tcpip/transport/tcp/rcv.go +++ b/pkg/tcpip/transport/tcp/rcv.go @@ -559,7 +559,6 @@ func (r *receiver) handleTimeWaitSegment(s *segment) (resetTimeWait bool, newSyn // (2) returns to TIME-WAIT state if the SYN turns out // to be an old duplicate". if s.flags.Contains(header.TCPFlagSyn) && r.RcvNxt.LessThan(segSeq) { - return false, true } |