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Message-Id: <20250905-redir-test-pass-drop-v1-2-9d9e43ff40df@rbox.co>
Date: Fri, 05 Sep 2025 13:11:42 +0200
From: Michal Luczaj <mhal@...x.co>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <martin.lau@...ux.dev>,
Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
Yonghong Song <yonghong.song@...ux.dev>,
John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>,
Shuah Khan <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, Michal Luczaj <mhal@...x.co>
Subject: [PATCH bpf-next 2/5] selftests/bpf: sockmap_redir: Fix OOB
handling
In some test cases, OOB packets might have been left unread. Flush them out
and introduce additional checks.
Signed-off-by: Michal Luczaj <mhal@...x.co>
---
tools/testing/selftests/bpf/prog_tests/sockmap_redir.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c b/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
index c1bf1076e8152b7d83c3e07e2dce746b5a39cf7e..4997e72c14345b274367f3f2f4115c39d1ae48c9 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_redir.c
@@ -184,6 +184,19 @@ static void handle_unsupported(int sd_send, int sd_peer, int sd_in, int sd_out,
FAIL_ERRNO("unsupported: packet missing, retval=%zd", n);
}
+ /* af_unix send("ab", MSG_OOB) spits out 2 packets, but only the latter
+ * ("b") is designated OOB. If the peer is in a sockmap, the OOB packet
+ * will be silently dropped. Otherwise OOB stays in the queue and should
+ * be taken care of.
+ */
+ if ((send_flags & MSG_OOB) && !pass && !drop) {
+ errno = 0;
+ n = recv_timeout(sd_peer, &recv_buf, 1, MSG_OOB, IO_TIMEOUT_SEC);
+ /* Ignore unsupported sk_msg error */
+ if (n != 1 && errno != EOPNOTSUPP)
+ FAIL_ERRNO("recv(OOB): retval=%zd", n);
+ }
+
/* Ensure queues are empty */
fail_recv("bpf.recv(sd_send)", sd_send, 0);
if (sd_in != sd_send)
@@ -192,6 +205,9 @@ static void handle_unsupported(int sd_send, int sd_peer, int sd_in, int sd_out,
fail_recv("bpf.recv(sd_out)", sd_out, 0);
if (sd_recv != sd_out)
fail_recv("bpf.recv(sd_recv)", sd_recv, 0);
+
+ fail_recv("recv(sd_peer, OOB)", sd_peer, MSG_OOB);
+ fail_recv("recv(sd_out, OOB)", sd_out, MSG_OOB);
}
static void test_send_redir_recv(int sd_send, int send_flags, int sd_peer,
--
2.50.1
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