1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include "udp_limit.skel.h"
4
5 #include <sys/types.h>
6 #include <sys/socket.h>
7
8 void test_udp_limit(void)
9 {
10 struct udp_limit *skel;
11 int fd1 = -1, fd2 = -1;
12 int cgroup_fd;
13
14 cgroup_fd = test__join_cgroup("/udp_limit");
15 if (!ASSERT_GE(cgroup_fd, 0, "cg-join"))
16 return;
17
18 skel = udp_limit__open_and_load();
19 if (!ASSERT_OK_PTR(skel, "skel-load"))
20 goto close_cgroup_fd;
21
22 skel->links.sock = bpf_program__attach_cgroup(skel->progs.sock, cgroup_fd);
23 if (!ASSERT_OK_PTR(skel->links.sock, "cg_attach_sock"))
24 goto close_skeleton;
25 skel->links.sock_release = bpf_program__attach_cgroup(skel->progs.sock_release, cgroup_fd);
26 if (!ASSERT_OK_PTR(skel->links.sock_release, "cg_attach_sock_release"))
27 goto close_skeleton;
28
29 /* BPF program enforces a single UDP socket per cgroup,
30 * verify that.
31 */
32 fd1 = socket(AF_INET, SOCK_DGRAM, 0);
33 if (!ASSERT_GE(fd1, 0, "socket(fd1)"))
34 goto close_skeleton;
35
36 fd2 = socket(AF_INET, SOCK_DGRAM, 0);
37 if (!ASSERT_LT(fd2, 0, "socket(fd2)"))
38 goto close_skeleton;
39
40 /* We can reopen again after close. */
41 close(fd1);
42 fd1 = -1;
43
44 fd1 = socket(AF_INET, SOCK_DGRAM, 0);
45 if (!ASSERT_GE(fd1, 0, "socket(fd1-again)"))
46 goto close_skeleton;
47
48 /* Make sure the program was invoked the expected
49 * number of times:
50 * - open fd1 - BPF_CGROUP_INET_SOCK_CREATE
51 * - attempt to openfd2 - BPF_CGROUP_INET_SOCK_CREATE
52 * - close fd1 - BPF_CGROUP_INET_SOCK_RELEASE
53 * - open fd1 again - BPF_CGROUP_INET_SOCK_CREATE
54 */
55 if (!ASSERT_EQ(skel->bss->invocations, 4, "bss-invocations"))
56 goto close_skeleton;
57
58 /* We should still have a single socket in use */
59 if (!ASSERT_EQ(skel->bss->in_use, 1, "bss-in_use"))
60 goto close_skeleton;
61
62 close_skeleton:
63 if (fd1 >= 0)
64 close(fd1);
65 if (fd2 >= 0)
66 close(fd2);
67 udp_limit__destroy(skel);
68 close_cgroup_fd:
69 close(cgroup_fd);
70 }
71
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