cgroup_mprog_ordering.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
 3#include <test_progs.h>
 4#include "cgroup_helpers.h"
 5#include "cgroup_preorder.skel.h"
 6
 7static int run_getsockopt_test(int cg_parent, int sock_fd, bool has_relative_fd)
 8{
 9	LIBBPF_OPTS(bpf_prog_attach_opts, opts);
10	enum bpf_attach_type prog_p_atype, prog_p2_atype;
11	int prog_p_fd, prog_p2_fd;
12	struct cgroup_preorder *skel = NULL;
13	struct bpf_program *prog;
14	__u8 *result, buf;
15	socklen_t optlen = 1;
16	int err = 0;
17
18	skel = cgroup_preorder__open_and_load();
19	if (!ASSERT_OK_PTR(skel, "cgroup_preorder__open_and_load"))
20		return 0;
21
22	LIBBPF_OPTS_RESET(opts);
23	opts.flags = BPF_F_ALLOW_MULTI;
24	prog = skel->progs.parent;
25	prog_p_fd = bpf_program__fd(prog);
26	prog_p_atype = bpf_program__expected_attach_type(prog);
27	err = bpf_prog_attach_opts(prog_p_fd, cg_parent, prog_p_atype, &opts);
28	if (!ASSERT_OK(err, "bpf_prog_attach_opts-parent"))
29		goto close_skel;
30
31	opts.flags = BPF_F_ALLOW_MULTI | BPF_F_BEFORE;
32	if (has_relative_fd)
33		opts.relative_fd = prog_p_fd;
34	prog = skel->progs.parent_2;
35	prog_p2_fd = bpf_program__fd(prog);
36	prog_p2_atype = bpf_program__expected_attach_type(prog);
37	err = bpf_prog_attach_opts(prog_p2_fd, cg_parent, prog_p2_atype, &opts);
38	if (!ASSERT_OK(err, "bpf_prog_attach_opts-parent_2"))
39		goto detach_parent;
40
41	err = getsockopt(sock_fd, SOL_IP, IP_TOS, &buf, &optlen);
42	if (!ASSERT_OK(err, "getsockopt"))
43		goto detach_parent_2;
44
45	result = skel->bss->result;
46	ASSERT_TRUE(result[0] == 4 && result[1] == 3, "result values");
47
48detach_parent_2:
49	ASSERT_OK(bpf_prog_detach2(prog_p2_fd, cg_parent, prog_p2_atype),
50		  "bpf_prog_detach2-parent_2");
51detach_parent:
52	ASSERT_OK(bpf_prog_detach2(prog_p_fd, cg_parent, prog_p_atype),
53		  "bpf_prog_detach2-parent");
54close_skel:
55	cgroup_preorder__destroy(skel);
56	return err;
57}
58
59void test_cgroup_mprog_ordering(void)
60{
61	int cg_parent = -1, sock_fd = -1;
62
63	cg_parent = test__join_cgroup("/parent");
64	if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent"))
65		goto out;
66
67	sock_fd = socket(AF_INET, SOCK_STREAM, 0);
68	if (!ASSERT_GE(sock_fd, 0, "socket"))
69		goto out;
70
71	ASSERT_OK(run_getsockopt_test(cg_parent, sock_fd, false), "getsockopt_test_1");
72	ASSERT_OK(run_getsockopt_test(cg_parent, sock_fd, true), "getsockopt_test_2");
73
74out:
75	close(sock_fd);
76	close(cg_parent);
77}