On 8/3/23 7:24 PM, Geliang Tang wrote:
Hi Yonghong,
On Thu, Aug 03, 2023 at 06:23:57PM -0700, Yonghong Song wrote:
On 8/3/23 6:41 AM, Geliang Tang wrote:
Implement a new test program mptcpify: if the family is AF_INET or AF_INET6, the type is SOCK_STREAM, and the protocol ID is 0 or IPPROTO_TCP, set it to IPPROTO_MPTCP. It will be hooked in update_socket_protocol().
Extend the MPTCP test base, add a selftest test_mptcpify() for the mptcpify case. Open and load the mptcpify test prog to mptcpify the TCP sockets dynamically, then use start_server() and connect_to_fd() to create a TCP socket, but actually what's created is an MPTCP socket, which can be verified through the outputs of 'ss' and 'nstat' commands.
Reviewed-by: Matthieu Baerts matthieu.baerts@tessares.net Signed-off-by: Geliang Tang geliang.tang@suse.com
.../testing/selftests/bpf/prog_tests/mptcp.c | 94 +++++++++++++++++++ tools/testing/selftests/bpf/progs/mptcpify.c | 25 +++++ 2 files changed, 119 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/mptcpify.c
diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 4407bd5c9e9a..caab3aa6a162 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -6,6 +6,7 @@ #include "cgroup_helpers.h" #include "network_helpers.h" #include "mptcp_sock.skel.h" +#include "mptcpify.skel.h" char NS_TEST[32]; @@ -195,8 +196,101 @@ static void test_base(void) close(cgroup_fd); } +static void send_byte(int fd) +{
- char b = 0x55;
- ASSERT_EQ(write(fd, &b, sizeof(b)), 1, "send single byte");
+}
+static int verify_mptcpify(void) +{
- char cmd[256];
- int err = 0;
- snprintf(cmd, sizeof(cmd),
"ip netns exec %s ss -tOni | grep -q '%s'",NS_TEST, "tcp-ulp-mptcp");Could you show what is the expected output from the above command line ip netns exec %s ss -tOni ? This way, users can easily reason about the ss states based on tests.
There're too many items in the output of command 'ip netns exec %s ss -tOni':
''' State Recv-Q Send-Q Local Address:Port Peer Address:Port Process ESTAB 0 0 127.0.0.1:42225 127.0.0.1:44180 cubic wscale:7,7 rto:201 rtt:0.034/0.017 ato:40 mss:16640 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_received:1 segs_out:1 segs_in:3 data_segs_in:1 send 39152941176bps lastsnd:7 lastrcv:7 lastack:7 pacing_rate 78305882352bps delivered:1 app_limited rcv_space:33280 rcv_ssthresh:33280 minrtt:0.034 snd_wnd:33280 tcp-ulp-mptcp flags:Mec token:0000(id:0)/3a1e0d3c(id:0) seq:c2802f11c5228db6 sfseq:1 ssnoff:49d3c135 maplen:1 ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic wscale:7,7 rto:201 rtt:0.036/0.02 mss:16640 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_sent:1 bytes_acked:2 segs_out:3 segs_in:2 data_segs_out:1 send 36977777778bps lastsnd:7 lastrcv:7 lastack:7 pacing_rate 72200677960bps delivery_rate 8874666664bps delivered:2 rcv_space:33280 rcv_ssthresh:33280 minrtt:0.015 snd_wnd:33280 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/39429ce(id:0) seq:e3ed00de37c805c sfseq:1 ssnoff:d4e4d561 maplen:0 '''
We only care about this 'tcp-ulp-mptcp' item.
Show all output will confuse users. So we just pick and test the only item we care.
Thanks. Originally I thought at least we should put one line in the comment which has 'tcp-ulp-mptcp' like
ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic wscale:7,7 rto:201 rtt:0.036/0.02 mss:16640 pmtu:65535 rcvmss:536 advmss:65483 cwnd:10 bytes_sent:1 bytes_acked:2 segs_out:3 segs_in:2 data_segs_out:1 send 36977777778bps lastsnd:7 lastrcv:7 lastack:7 pacing_rate 72200677960bps delivery_rate 8874666664bps delivered:2 rcv_space:33280 rcv_ssthresh:33280 minrtt:0.015 snd_wnd:33280 tcp-ulp-mptcp flags:Mmec token:0000(id:0)/39429ce(id:0) seq:e3ed00de37c805c sfseq:1 ssnoff:d4e4d561 maplen:0
or simplified version
ESTAB 0 0 127.0.0.1:44180 127.0.0.1:42225 cubic ... tcp-ulp-mptcp flags:Mmec ...
But people familiar with 'ss' should be able to dump it and get the above (maybe without tcp-ulp-mptcp) easily. So I am okay with no additional comments.
- if (!ASSERT_OK(system(cmd), "No tcp-ulp-mptcp found!"))
err++;- snprintf(cmd, sizeof(cmd),
"ip netns exec %s nstat -asz %s | awk '%s' | grep -q '%s'",NS_TEST, "MPTcpExtMPCapableSYNACKRX","NR==1 {next} {print $2}", "1");The same thing here. Could you show the expected output with ip netns exec %s nstat -asz %s ?
The output of 'ip netns exec %s nstat -asz %s' is:
''' #kernel MPTcpExtMPCapableSYNACKRX 1 0.0 '''
The same, we only check if it contains an MPTcpExtMPCapableSYNACKRX, not show the output.
-Geliang
- if (!ASSERT_OK(system(cmd), "No MPTcpExtMPCapableSYNACKRX found!"))
err++;- return err;
+}
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