1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020 Facebook
3
4#include <test_progs.h>
5
6#include "network_helpers.h"
7#include "cgroup_skb_sk_lookup_kern.skel.h"
8
9static void run_lookup_test(__u16 *g_serv_port, int out_sk)
10{
11	int serv_sk = -1, in_sk = -1, serv_in_sk = -1, err;
12	struct sockaddr_in6 addr = {};
13	socklen_t addr_len = sizeof(addr);
14	__u32 duration = 0;
15
16	serv_sk = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
17	if (CHECK(serv_sk < 0, "start_server", "failed to start server\n"))
18		return;
19
20	err = getsockname(serv_sk, (struct sockaddr *)&addr, &addr_len);
21	if (CHECK(err, "getsockname", "errno %d\n", errno))
22		goto cleanup;
23
24	*g_serv_port = addr.sin6_port;
25
26	/* Client outside of test cgroup should fail to connect by timeout. */
27	err = connect_fd_to_fd(out_sk, serv_sk, 1000);
28	if (CHECK(!err || errno != EINPROGRESS, "connect_fd_to_fd",
29		  "unexpected result err %d errno %d\n", err, errno))
30		goto cleanup;
31
32	/* Client inside test cgroup should connect just fine. */
33	in_sk = connect_to_fd(serv_sk, 0);
34	if (CHECK(in_sk < 0, "connect_to_fd", "errno %d\n", errno))
35		goto cleanup;
36
37	serv_in_sk = accept(serv_sk, NULL, NULL);
38	if (CHECK(serv_in_sk < 0, "accept", "errno %d\n", errno))
39		goto cleanup;
40
41cleanup:
42	close(serv_in_sk);
43	close(in_sk);
44	close(serv_sk);
45}
46
47static void run_cgroup_bpf_test(const char *cg_path, int out_sk)
48{
49	struct cgroup_skb_sk_lookup_kern *skel;
50	struct bpf_link *link;
51	__u32 duration = 0;
52	int cgfd = -1;
53
54	skel = cgroup_skb_sk_lookup_kern__open_and_load();
55	if (CHECK(!skel, "skel_open_load", "open_load failed\n"))
56		return;
57
58	cgfd = test__join_cgroup(cg_path);
59	if (CHECK(cgfd < 0, "cgroup_join", "cgroup setup failed\n"))
60		goto cleanup;
61
62	link = bpf_program__attach_cgroup(skel->progs.ingress_lookup, cgfd);
63	if (!ASSERT_OK_PTR(link, "cgroup_attach"))
64		goto cleanup;
65
66	run_lookup_test(&skel->bss->g_serv_port, out_sk);
67
68	bpf_link__destroy(link);
69
70cleanup:
71	close(cgfd);
72	cgroup_skb_sk_lookup_kern__destroy(skel);
73}
74
75void test_cgroup_skb_sk_lookup(void)
76{
77	const char *cg_path = "/foo";
78	int out_sk;
79
80	/* Create a socket before joining testing cgroup so that its cgroup id
81	 * differs from that of testing cgroup. Moving selftests process to
82	 * testing cgroup won't change cgroup id of an already created socket.
83	 */
84	out_sk = socket(AF_INET6, SOCK_STREAM, 0);
85	if (CHECK_FAIL(out_sk < 0))
86		return;
87
88	run_cgroup_bpf_test(cg_path, out_sk);
89
90	close(out_sk);
91}
92