[PATCH net 4/5] selftests: tls: add test for merging of same-type control messages

[Sabrina Dubroca]

Two consecutive control messages of the same type should never be
merged into one large received blob of data.

Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
---
 tools/testing/selftests/net/tls.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/testing/selftests/net/tls.c 
b/tools/testing/selftests/net/tls.c
index 49c84602707f..2714c230a0f9 100644
--- a/tools/testing/selftests/net/tls.c
+++ b/tools/testing/selftests/net/tls.c
@@ -1485,6 +1485,32 @@ TEST_F(tls, control_msg)
        EXPECT_EQ(memcmp(buf, test_str, send_len), 0);
 }
 
+TEST_F(tls, control_msg_nomerge)
+{
+       char *rec1 = "1111";
+       char *rec2 = "2222";
+       int send_len = 5;
+       char buf[15];
+
+       if (self->notls)
+               SKIP(return, "no TLS support");
+
+       EXPECT_EQ(tls_send_cmsg(self->fd, 100, rec1, send_len, 0), send_len);
+       EXPECT_EQ(tls_send_cmsg(self->fd, 100, rec2, send_len, 0), send_len);
+
+       EXPECT_EQ(tls_recv_cmsg(_metadata, self->cfd, 100, buf, sizeof(buf), 
MSG_PEEK), send_len);
+       EXPECT_EQ(memcmp(buf, rec1, send_len), 0);
+
+       EXPECT_EQ(tls_recv_cmsg(_metadata, self->cfd, 100, buf, sizeof(buf), 
MSG_PEEK), send_len);
+       EXPECT_EQ(memcmp(buf, rec1, send_len), 0);
+
+       EXPECT_EQ(tls_recv_cmsg(_metadata, self->cfd, 100, buf, sizeof(buf), 
0), send_len);
+       EXPECT_EQ(memcmp(buf, rec1, send_len), 0);
+
+       EXPECT_EQ(tls_recv_cmsg(_metadata, self->cfd, 100, buf, sizeof(buf), 
0), send_len);
+       EXPECT_EQ(memcmp(buf, rec2, send_len), 0);
+}
+
 TEST_F(tls, shutdown)
 {
        char const *test_str = "test_read";
-- 
2.43.0