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rfc6675-accounting-test.pkt
rscheff (Richard Scheffenegger)
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rscheff
Jan 27 2019, 12:32 AM
2019-01-27 00:32:14 (UTC+0)
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rfc6675-accounting-test.pkt
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// A test to trigger a bug in the old 6675 sacked_bytes code
//
// Scenario: 2 losses in a window, but client can only
// report back 1 sack block (instead of 2, 3, 4)
--tolerance_usecs=500000
// Flush Hostcache
0.0 `sysctl net.inet.tcp.rfc6675_pipe=1`
0.1 `sysctl net.inet.tcp.hostcache.purgenow=1`
0.2 `sync` // in case of crash
// Create a listening TCP socket.
0.50 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0.005 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0.005 setsockopt(3, SOL_SOCKET, SO_DEBUG, [1], 4) = 0
+0.005 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [1048576], 4) = 0
+0.005 bind(3, ..., ...) = 0
+0.005 listen(3, 1) = 0
// Establish a TCP connection.
+0.035 < SEW 0:0(0) win 65535 <mss 1000, sackOK, eol, eol>
+0.000 > SE. 0:0(0) ack 1 win 65535 <...>
+0.000 < . 1:1(0) ack 1 win 65535
+0.000 accept(3, ..., ...) = 4
0.700 write(4, ..., 35000) = 35000
// Open cwnd first
+0 > . 1:1001(1000) ack 1
+0 < . 1:1(0) ack 1001 win 65535
+0 > . 1001:2001(1000) ack 1
+0 < . 1:1(0) ack 2001 win 65535
+0 > . 2001:3001(1000) ack 1
+0 < . 1:1(0) ack 3001 win 65535
+0 > . 3001:4001(1000) ack 1
+0 < . 1:1(0) ack 4001 win 65535
+0 > . 4001:5001(1000) ack 1
+0 < . 1:1(0) ack 5001 win 65535
+0 > . 5001:6001(1000) ack 1
+0 < . 1:1(0) ack 6001 win 65535
+0 > . 6001:7001(1000) ack 1
+0 < . 1:1(0) ack 7001 win 65535
+0 > . 7001:8001(1000) ack 1
+0 < . 1:1(0) ack 8001 win 65535
+0 > . 8001:9001(1000) ack 1
+0 < . 1:1(0) ack 9001 win 65535
+0 > . 9001:10001(1000) ack 1
+0 < . 1:1(0) ack 10001 win 65535
//+0 %{ print tcpi_snd_cwnd }%
+0 > . 10001:11001(1000) ack 1 // drop
+0 > . 11001:12001(1000) ack 1
+0 > . 12001:13001(1000) ack 1
+0 > . 13001:14001(1000) ack 1
+0 > . 14001:15001(1000) ack 1
+0 > . 15001:16001(1000) ack 1
+0 > . 16001:17001(1000) ack 1
+0 > . 17001:18001(1000) ack 1
+0 > . 18001:19001(1000) ack 1
+0 > . 19001:20001(1000) ack 1
+0 > . 20001:21001(1000) ack 1
+0 > . 21001:22001(1000) ack 1 // drop
+0 > . 22001:23001(1000) ack 1
+0 > . 23001:24001(1000) ack 1
+0 > . 24001:25001(1000) ack 1
+0 > . 25001:26001(1000) ack 1
+0 > . 26001:27001(1000) ack 1
+0 > . 27001:28001(1000) ack 1
+0 > . 28001:29001(1000) ack 1
+0 > . 29001:30001(1000) ack 1
+0 write(4, ..., 10000) = 10000
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:12001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:13001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:14001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:15001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:16001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:17001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:18001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:19001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:20001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 11001:21001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 > . 30001:31001(1000) ack 1
+0 %{ print "- {} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 > . 31001:32001(1000) ack 1
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:23001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:24001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:25001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:26001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:27001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:28001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:29001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:30001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:31001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh) }%
+0 < . 1:1(0) ack 10001 win 65535 <sack 22001:32001, nop, nop>
+0 %{ print "{} {}".format(tcpi_snd_cwnd, tcpi_snd_ssthresh)
if (tcpi_snd_cwnd != 8000):
print "cwnd should be at 8000 despite the incomplete SACK information"
assert (tcpi_snd_cwnd == 8000)
}%
+0 > W. 10001:11001(1000) ack 1
+0 > . 21001:22001(1000) ack 1
+0 > . 32001:33001(1000) ack 1
+0 > . 33001:34001(1000) ack 1
+0 > . 34001:35001(1000) ack 1
+0 > . 35001:36001(1000) ack 1
+0 > . 36001:37001(1000) ack 1
+0 > . 37001:38001(1000) ack 1
//RTO
+0.2 > . 10001:11001(1000) ack 1
+0.2 close(4) = 0
//+0.01 < F. 1:1(0) ack 38002 win 65535
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