1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <test_progs.h>
4 
5 #include "connect4_dropper.skel.h"
6 
7 #include "cgroup_helpers.h"
8 #include "network_helpers.h"
9 
10 static int run_test(int cgroup_fd, int server_fd, bool classid)
11 {
12 	struct network_helper_opts opts = {
13 		.must_fail = true,
14 	};
15 	struct connect4_dropper *skel;
16 	int fd, err = 0;
17 
18 	skel = connect4_dropper__open_and_load();
19 	if (!ASSERT_OK_PTR(skel, "skel_open"))
20 		return -1;
21 
22 	skel->links.connect_v4_dropper =
23 		bpf_program__attach_cgroup(skel->progs.connect_v4_dropper,
24 					   cgroup_fd);
25 	if (!ASSERT_OK_PTR(skel->links.connect_v4_dropper, "prog_attach")) {
26 		err = -1;
27 		goto out;
28 	}
29 
30 	if (classid && !ASSERT_OK(join_classid(), "join_classid")) {
31 		err = -1;
32 		goto out;
33 	}
34 
35 	fd = connect_to_fd_opts(server_fd, &opts);
36 	if (fd < 0)
37 		err = -1;
38 	else
39 		close(fd);
40 out:
41 	connect4_dropper__destroy(skel);
42 	return err;
43 }
44 
45 void test_cgroup_v1v2(void)
46 {
47 	struct network_helper_opts opts = {};
48 	int server_fd, client_fd, cgroup_fd;
49 	static const int port = 60120;
50 
51 	/* Step 1: Check base connectivity works without any BPF. */
52 	server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
53 	if (!ASSERT_GE(server_fd, 0, "server_fd"))
54 		return;
55 	client_fd = connect_to_fd_opts(server_fd, &opts);
56 	if (!ASSERT_GE(client_fd, 0, "client_fd")) {
57 		close(server_fd);
58 		return;
59 	}
60 	close(client_fd);
61 	close(server_fd);
62 
63 	/* Step 2: Check BPF policy prog attached to cgroups drops connectivity. */
64 	cgroup_fd = test__join_cgroup("/connect_dropper");
65 	if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
66 		return;
67 	server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
68 	if (!ASSERT_GE(server_fd, 0, "server_fd")) {
69 		close(cgroup_fd);
70 		return;
71 	}
72 	ASSERT_OK(run_test(cgroup_fd, server_fd, false), "cgroup-v2-only");
73 	setup_classid_environment();
74 	set_classid(42);
75 	ASSERT_OK(run_test(cgroup_fd, server_fd, true), "cgroup-v1v2");
76 	cleanup_classid_environment();
77 	close(server_fd);
78 	close(cgroup_fd);
79 }
80