selftests/bpf: Verify token of struct mptcp_sock

This patch verifies the struct member token of struct mptcp_sock. Add a
new member token in struct mptcp_storage to store the token value of the
msk socket got by bpf_skc_to_mptcp_sock(). Trace the kernel function
mptcp_pm_new_connection() by using bpf fentry prog to obtain the msk token
and save it in a global bpf variable. Pass the variable to verify_msk() to
verify it with the token saved in socket_storage_map.

v4:
 - use ASSERT_* instead of CHECK_FAIL (Andrii)
 - skip the test if 'ip mptcp monitor' is not supported (Mat)

v5:
 - Drop 'ip mptcp monitor', trace mptcp_pm_new_connection instead (Martin)
 - Use ASSERT_EQ (Andrii)

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Link: https://lore.kernel.org/bpf/20220519233016.105670-6-mathew.j.martineau@linux.intel.com

1 files changed, 13 insertions, 2 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index 227682ae8e09..c84d7c593f9f 100644
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -10,6 +10,7 @@
 struct mptcp_storage {
 	__u32 invoked;
 	__u32 is_mptcp;
+	__u32 token;
 };
 
 static int verify_tsk(int map_fd, int client_fd)
@@ -30,11 +31,14 @@ static int verify_tsk(int map_fd, int client_fd)
 	return err;
 }
 
-static int verify_msk(int map_fd, int client_fd)
+static int verify_msk(int map_fd, int client_fd, __u32 token)
 {
 	int err, cfd = client_fd;
 	struct mptcp_storage val;
 
+	if (!ASSERT_GT(token, 0, "invalid token"))
+		return -1;
+
 	err = bpf_map_lookup_elem(map_fd, &cfd, &val);
 	if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
 		return err;
@@ -45,6 +49,9 @@ static int verify_msk(int map_fd, int client_fd)
 	if (!ASSERT_EQ(val.is_mptcp, 1, "unexpected is_mptcp"))
 		err++;
 
+	if (!ASSERT_EQ(val.token, token, "unexpected token"))
+		err++;
+
 	return err;
 }
 
@@ -57,6 +64,10 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
 	if (!ASSERT_OK_PTR(sock_skel, "skel_open_load"))
 		return -EIO;
 
+	err = mptcp_sock__attach(sock_skel);
+	if (!ASSERT_OK(err, "skel_attach"))
+		goto out;
+
 	prog_fd = bpf_program__fd(sock_skel->progs._sockops);
 	if (!ASSERT_GE(prog_fd, 0, "bpf_program__fd")) {
 		err = -EIO;
@@ -79,7 +90,7 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
 		goto out;
 	}
 
-	err += is_mptcp ? verify_msk(map_fd, client_fd) :
+	err += is_mptcp ? verify_msk(map_fd, client_fd, sock_skel->bss->token) :
 			  verify_tsk(map_fd, client_fd);
 
 	close(client_fd);