netdev - [PATCH net 2/2] selftests/tls: add a litmus test for the socket reuse through shutdown

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Date:   Thu,  1 Aug 2019 14:36:02 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com,
        edumazet@...gle.com, davejwatson@...com, borisp@...lanox.com,
        aviadye@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net, Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net 2/2] selftests/tls: add a litmus test for the socket reuse through shutdown

Make sure that shutdown never works, and at the same time document how
I tested to came to the conclusion that currently reuse is not possible.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 tools/testing/selftests/net/tls.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
index d995e6503b1a..4c285b6e1db8 100644
--- a/tools/testing/selftests/net/tls.c
+++ b/tools/testing/selftests/net/tls.c
@@ -984,6 +984,30 @@ TEST_F(tls, shutdown_unsent)
 	shutdown(self->cfd, SHUT_RDWR);
 }
 
+TEST_F(tls, shutdown_reuse)
+{
+	struct sockaddr_in addr;
+	int ret;
+
+	shutdown(self->fd, SHUT_RDWR);
+	shutdown(self->cfd, SHUT_RDWR);
+	close(self->cfd);
+
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	addr.sin_port = 0;
+
+	ret = bind(self->fd, &addr, sizeof(addr));
+	EXPECT_EQ(ret, 0);
+	ret = listen(self->fd, 10);
+	EXPECT_EQ(ret, -1);
+	EXPECT_EQ(errno, EINVAL);
+
+	ret = connect(self->fd, &addr, sizeof(addr));
+	EXPECT_EQ(ret, -1);
+	EXPECT_EQ(errno, EISCONN);
+}
+
 TEST(non_established) {
 	struct tls12_crypto_info_aes_gcm_256 tls12;
 	struct sockaddr_in addr;
-- 
2.21.0