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
run_test(int cgroup_fd,int server_fd,bool classid)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
test_cgroup_v1v2(void)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