1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
4#define _GNU_SOURCE
5#include <cgroup_helpers.h>
6#include <test_progs.h>
7#include <sched.h>
8#include <sys/wait.h>
9
10#include "cgrp_kfunc_failure.skel.h"
11#include "cgrp_kfunc_success.skel.h"
12
13static struct cgrp_kfunc_success *open_load_cgrp_kfunc_skel(void)
14{
15 struct cgrp_kfunc_success *skel;
16 int err;
17
18 skel = cgrp_kfunc_success__open();
19 if (!ASSERT_OK_PTR(skel, "skel_open"))
20 return NULL;
21
22 skel->bss->pid = getpid();
23
24 err = cgrp_kfunc_success__load(skel);
25 if (!ASSERT_OK(err, "skel_load"))
26 goto cleanup;
27
28 return skel;
29
30cleanup:
31 cgrp_kfunc_success__destroy(skel);
32 return NULL;
33}
34
35static int mkdir_rm_test_dir(void)
36{
37 int fd;
38 const char *cgrp_path = "cgrp_kfunc";
39
40 fd = create_and_get_cgroup(cgrp_path);
41 if (!ASSERT_GT(fd, 0, "mkdir_cgrp_fd"))
42 return -1;
43
44 close(fd);
45 remove_cgroup(cgrp_path);
46
47 return 0;
48}
49
50static void run_success_test(const char *prog_name)
51{
52 struct cgrp_kfunc_success *skel;
53 struct bpf_program *prog;
54 struct bpf_link *link = NULL;
55
56 skel = open_load_cgrp_kfunc_skel();
57 if (!ASSERT_OK_PTR(skel, "open_load_skel"))
58 return;
59
60 if (!ASSERT_OK(skel->bss->err, "pre_mkdir_err"))
61 goto cleanup;
62
63 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
64 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
65 goto cleanup;
66
67 link = bpf_program__attach(prog);
68 if (!ASSERT_OK_PTR(link, "attached_link"))
69 goto cleanup;
70
71 ASSERT_EQ(skel->bss->invocations, 0, "pre_rmdir_count");
72 if (!ASSERT_OK(mkdir_rm_test_dir(), "cgrp_mkdir"))
73 goto cleanup;
74
75 ASSERT_EQ(skel->bss->invocations, 1, "post_rmdir_count");
76 ASSERT_OK(skel->bss->err, "post_rmdir_err");
77
78cleanup:
79 bpf_link__destroy(link);
80 cgrp_kfunc_success__destroy(skel);
81}
82
83static const char * const success_tests[] = {
84 "test_cgrp_acquire_release_argument",
85 "test_cgrp_acquire_leave_in_map",
86 "test_cgrp_xchg_release",
87 "test_cgrp_get_release",
88 "test_cgrp_get_ancestors",
89 "test_cgrp_from_id",
90};
91
92static void test_cgrp_from_id_ns(void)
93{
94 LIBBPF_OPTS(bpf_test_run_opts, opts);
95 struct cgrp_kfunc_success *skel;
96 struct bpf_program *prog;
97 int pid, pipe_fd[2];
98
99 skel = open_load_cgrp_kfunc_skel();
100 if (!ASSERT_OK_PTR(skel, "open_load_skel"))
101 return;
102
103 if (!ASSERT_OK(skel->bss->err, "pre_mkdir_err"))
104 goto cleanup;
105
106 prog = skel->progs.test_cgrp_from_id_ns;
107
108 if (!ASSERT_OK(pipe(pipe_fd), "pipe"))
109 goto cleanup;
110
111 pid = fork();
112 if (!ASSERT_GE(pid, 0, "fork result")) {
113 close(pipe_fd[0]);
114 close(pipe_fd[1]);
115 goto cleanup;
116 }
117
118 if (pid == 0) {
119 int ret = 0;
120
121 close(pipe_fd[0]);
122
123 if (!ASSERT_GE(cgroup_setup_and_join("cgrp_from_id_ns"), 0, "join cgroup"))
124 exit(1);
125
126 if (!ASSERT_OK(unshare(CLONE_NEWCGROUP), "unshare cgns"))
127 exit(1);
128
129 ret = bpf_prog_test_run_opts(bpf_program__fd(prog), &opts);
130 if (!ASSERT_OK(ret, "test run ret"))
131 exit(1);
132
133 if (!ASSERT_OK(opts.retval, "test run retval"))
134 exit(1);
135
136 if (!ASSERT_EQ(write(pipe_fd[1], &ret, sizeof(ret)), sizeof(ret), "write pipe"))
137 exit(1);
138
139 exit(0);
140 } else {
141 int res;
142
143 close(pipe_fd[1]);
144
145 ASSERT_EQ(read(pipe_fd[0], &res, sizeof(res)), sizeof(res), "read res");
146 ASSERT_EQ(waitpid(pid, NULL, 0), pid, "wait on child");
147
148 remove_cgroup_pid("cgrp_from_id_ns", pid);
149
150 ASSERT_OK(res, "result from run");
151 }
152
153 close(pipe_fd[0]);
154cleanup:
155 cgrp_kfunc_success__destroy(skel);
156}
157
158void test_cgrp_kfunc(void)
159{
160 int i, err;
161
162 err = setup_cgroup_environment();
163 if (!ASSERT_OK(err, "cgrp_env_setup"))
164 goto cleanup;
165
166 for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
167 if (!test__start_subtest(success_tests[i]))
168 continue;
169
170 run_success_test(prog_name: success_tests[i]);
171 }
172
173 if (test__start_subtest("test_cgrp_from_id_ns"))
174 test_cgrp_from_id_ns();
175
176 RUN_TESTS(cgrp_kfunc_failure);
177
178cleanup:
179 cleanup_cgroup_environment();
180}
181

source code of linux/tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c