1 files changed, 48 insertions, 0 deletions
diff --git a/test/packetdrill/tcp_defer_accept.pkt b/test/packetdrill/tcp_defer_accept.pkt
new file mode 100644
index 000000000..a17f946db
--- /dev/null
+++ b/test/packetdrill/tcp_defer_accept.pkt
@@ -0,0 +1,48 @@
+// Test that a bare ACK does not complete a connection when TCP_DEFER_ACCEPT
+// timeout is not hit but an ACK w/ data does complete and deliver the
+// connection to the accept queue.
+
+0  socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
++0 setsockopt(3, SOL_TCP, TCP_DEFER_ACCEPT, [5], 4) = 0
++0.000 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
++0 bind(3, ..., ...) = 0
+
+// Set backlog to 1 so that we can easily test.
++0 listen(3, 1) = 0
+
+// Establish a connection without timestamps.
++0.0 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
++0.0 > S. 0:0(0) ack 1    <...>
+
+// Send a bare ACK this should not complete the connection as we
+// set the TCP_DEFER_ACCEPT above.
++0.0 < . 1:1(0) ack 1 win 257
+
+// The bare ACK should be dropped and no connection should be delivered
+// to the accept queue.
++0.100 accept(3, ..., ...) = -1 EWOULDBLOCK (operation would block)
+
+// Send another bare ACK and it should still fail we set TCP_DEFER_ACCEPT
+// to 5 seconds above.
++2.5 < . 1:1(0) ack 1 win 257
++0.100 accept(3, ..., ...) = -1 EWOULDBLOCK (operation would block)
+
+// set accept socket back to blocking.
++0.000 fcntl(3, F_SETFL, O_RDWR) = 0
+
+// Now send an ACK w/ data. This should complete the connection
+// and deliver the socket to the accept queue.
++0.1 < . 1:5(4) ack 1 win 257
++0.0 > . 1:1(0) ack 5 <...>
+
+// This should cause connection to transition to connected state.
++0.000 accept(3, ..., ...) = 4
++0.000 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+
+// Now read the data and we should get 4 bytes.
++0.000 read(4,..., 4) = 4
++0.000 close(4) = 0
+
++0.0 > F. 1:1(0) ack 5 <...>
++0.0 < F. 5:5(0) ack 2 win 257
++0.01 > . 2:2(0) ack 6 <...>
+\ No newline at end of file