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Merge release-20191114.0-25-gb0a1bbd (automated)

This commit is contained in:
gVisor bot 2019-11-23 01:00:25 +00:00
parent a9af318351 b0a1bbd3e2
commit 9ee0687661
1 changed files with 9 additions and 0 deletions
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9
pkg/tcpip/transport/tcp/connect.go
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@ -299,6 +299,15 @@ func (h *handshake) synRcvdState(s *segment) *tcpip.Error {
return nil
}
// RFC 793, Section 3.9, page 69, states that in the SYN-RCVD state, a
// sequence number outside of the window causes an ACK with the proper seq
// number and "After sending the acknowledgment, drop the unacceptable
// segment and return."
if !s.sequenceNumber.InWindow(h.ackNum, h.rcvWnd) {
h.ep.sendRaw(buffer.VectorisedView{}, header.TCPFlagAck, h.iss+1, h.ackNum, h.rcvWnd)
return nil
}
if s.flagIsSet(header.TCPFlagSyn) && s.sequenceNumber != h.ackNum-1 {
// We received two SYN segments with different sequence
// numbers, so we reset this and restart the whole