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
10static int run_test(int cgroup_fd, int server_fd, bool classid)
11{
12	struct connect4_dropper *skel;
13	int fd, err = 0;
14
15	skel = connect4_dropper__open_and_load();
16	if (!ASSERT_OK_PTR(skel, "skel_open"))
17		return -1;
18
19	skel->links.connect_v4_dropper =
20		bpf_program__attach_cgroup(skel->progs.connect_v4_dropper,
21					   cgroup_fd);
22	if (!ASSERT_OK_PTR(skel->links.connect_v4_dropper, "prog_attach")) {
23		err = -1;
24		goto out;
25	}
26
27	if (classid && !ASSERT_OK(join_classid(), "join_classid")) {
28		err = -1;
29		goto out;
30	}
31
32	errno = 0;
33	fd = connect_to_fd_opts(server_fd, NULL);
34	if (fd >= 0) {
35		log_err("Unexpected success to connect to server");
36		err = -1;
37		close(fd);
38	} else if (errno != EPERM) {
39		log_err("Unexpected errno from connect to server");
40		err = -1;
41	}
42out:
43	connect4_dropper__destroy(skel);
44	return err;
45}
46
47void test_cgroup_v1v2(void)
48{
49	struct network_helper_opts opts = {};
50	int server_fd, client_fd, cgroup_fd;
51	static const int port = 60120;
52
53	/* Step 1: Check base connectivity works without any BPF. */
54	server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
55	if (!ASSERT_GE(server_fd, 0, "server_fd"))
56		return;
57	client_fd = connect_to_fd_opts(server_fd, &opts);
58	if (!ASSERT_GE(client_fd, 0, "client_fd")) {
59		close(server_fd);
60		return;
61	}
62	close(client_fd);
63	close(server_fd);
64
65	/* Step 2: Check BPF policy prog attached to cgroups drops connectivity. */
66	cgroup_fd = test__join_cgroup("/connect_dropper");
67	if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
68		return;
69	server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
70	if (!ASSERT_GE(server_fd, 0, "server_fd")) {
71		close(cgroup_fd);
72		return;
73	}
74	ASSERT_OK(run_test(cgroup_fd, server_fd, false), "cgroup-v2-only");
75	setup_classid_environment();
76	set_classid();
77	ASSERT_OK(run_test(cgroup_fd, server_fd, true), "cgroup-v1v2");
78	cleanup_classid_environment();
79	close(server_fd);
80	close(cgroup_fd);
81}