49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
// Test that a bare ACK is accepted after TCP_DEFER_ACCEPT timeout
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// is hit and a connection is delivered.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 setsockopt(3, SOL_TCP, TCP_DEFER_ACCEPT, [3], 4) = 0
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+0.000 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
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+0 bind(3, ..., ...) = 0
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// Set backlog to 1 so that we can easily test.
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+0 listen(3, 1) = 0
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// Establish a connection without timestamps.
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+0.0 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
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+0.0 > S. 0:0(0) ack 1 <...>
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// Send a bare ACK this should not complete the connection as we
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// set the TCP_DEFER_ACCEPT above.
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+0.0 < . 1:1(0) ack 1 win 257
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// The bare ACK should be dropped and no connection should be delivered
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// to the accept queue.
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+0.100 accept(3, ..., ...) = -1 EWOULDBLOCK (operation would block)
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// Send another bare ACK and it should still fail we set TCP_DEFER_ACCEPT
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// to 5 seconds above.
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+2.5 < . 1:1(0) ack 1 win 257
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+0.100 accept(3, ..., ...) = -1 EWOULDBLOCK (operation would block)
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// set accept socket back to blocking.
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+0.000 fcntl(3, F_SETFL, O_RDWR) = 0
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// We should see one more retransmit of the SYN-ACK as a last ditch
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// attempt when TCP_DEFER_ACCEPT timeout is hit to trigger another
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// ACK or a packet with data.
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+.35~+2.35 > S. 0:0(0) ack 1 <...>
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// Now send another bare ACK after TCP_DEFER_ACCEPT time has been passed.
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+0.0 < . 1:1(0) ack 1 win 257
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// The ACK above should cause connection to transition to connected state.
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+0.000 accept(3, ..., ...) = 4
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+0.000 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
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+0.000 close(4) = 0
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+0.0 > F. 1:1(0) ack 1 <...>
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+0.0 < F. 1:1(0) ack 2 win 257
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+0.01 > . 2:2(0) ack 2 <...>
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