selftests: tls: add test for merging of same-type control messages

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

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/018f1633d5471684c65def5fe390de3b15c3d683.1708007371.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
index 49c84602707f89d6f901ee60b63c4e5dfe75f8c8..2714c230a0f9f36a85a87171a7ee7a9d08b8c8a4 100644 (file)
--- 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";