Re: [PATCH bpf-next v4 2/3] selftests/bpf: Add connmark read test

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On 8/11/22 2:55 PM, Daniel Xu wrote:
Test that the prog can read from the connection mark. This test is nice
because it ensures progs can interact with netfilter subsystem
correctly.

Signed-off-by: Daniel Xu <dxu@xxxxxxxxx>
Acked-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
---
  tools/testing/selftests/bpf/prog_tests/bpf_nf.c | 3 ++-
  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 3 +++
  2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_nf.c b/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
index 88a2c0bdefec..544bf90ac2a7 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_nf.c
@@ -44,7 +44,7 @@ static int connect_to_server(int srv_fd)
static void test_bpf_nf_ct(int mode)
  {
-	const char *iptables = "iptables -t raw %s PREROUTING -j CT";
+	const char *iptables = "iptables -t raw %s PREROUTING -j CONNMARK --set-mark 42/0";
Hi Daniel Xu, this test starts failing recently in CI [0]:

Warning: Extension CONNMARK revision 0 not supported, missing kernel module?
iptables v1.8.8 (nf_tables): Could not fetch rule set generation id: Invalid argument

  Warning: Extension CONNMARK revision 0 not supported, missing kernel module?
iptables v1.8.8 (nf_tables): Could not fetch rule set generation id: Invalid argument

  Warning: Extension CONNMARK revision 0 not supported, missing kernel module?
iptables v1.8.8 (nf_tables): Could not fetch rule set generation id: Invalid argument

  Warning: Extension CONNMARK revision 0 not supported, missing kernel module?
iptables v1.8.8 (nf_tables): Could not fetch rule set generation id: Invalid argument

  test_bpf_nf_ct:PASS:test_bpf_nf__open_and_load 0 nsec
  test_bpf_nf_ct:FAIL:iptables unexpected error: 1024 (errno 0)

Could you help to take a look? Thanks.

[0]: https://github.com/kernel-patches/bpf/actions/runs/3231598391/jobs/5291529292

  	int srv_fd = -1, client_fd = -1, srv_client_fd = -1;
  	struct sockaddr_in peer_addr = {};
  	struct test_bpf_nf *skel;
@@ -114,6 +114,7 @@ static void test_bpf_nf_ct(int mode)
  	/* expected status is IPS_SEEN_REPLY */
  	ASSERT_EQ(skel->bss->test_status, 2, "Test for ct status update ");
  	ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup");
+	ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark");
  end:
  	if (srv_client_fd != -1)
  		close(srv_client_fd);
diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
index 84e0fd479794..2722441850cc 100644
--- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
+++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
@@ -28,6 +28,7 @@ __be16 sport = 0;
  __be32 daddr = 0;
  __be16 dport = 0;
  int test_exist_lookup = -ENOENT;
+u32 test_exist_lookup_mark = 0;
struct nf_conn; @@ -174,6 +175,8 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
  		       sizeof(opts_def));
  	if (ct) {
  		test_exist_lookup = 0;
+		if (ct->mark == 42)
+			test_exist_lookup_mark = 43;
  		bpf_ct_release(ct);
  	} else {
  		test_exist_lookup = opts_def.error;




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