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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
3
4#define _GNU_SOURCE
5#include <test_progs.h>
6#include "test_ns_current_pid_tgid.skel.h"
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <unistd.h>
10#include <sys/syscall.h>
11#include <sched.h>
12#include <sys/wait.h>
13#include <sys/mount.h>
14#include <fcntl.h>
15#include "network_helpers.h"
16
17#define STACK_SIZE (1024 * 1024)
18static char child_stack[STACK_SIZE];
19
20static int get_pid_tgid(pid_t *pid, pid_t *tgid,
21 struct test_ns_current_pid_tgid__bss *bss)
22{
23 struct stat st;
24 int err;
25
26 *pid = sys_gettid();
27 *tgid = getpid();
28
29 err = stat("/proc/self/ns/pid", &st);
30 if (!ASSERT_OK(err, "stat /proc/self/ns/pid"))
31 return err;
32
33 bss->dev = st.st_dev;
34 bss->ino = st.st_ino;
35 bss->user_pid = 0;
36 bss->user_tgid = 0;
37 return 0;
38}
39
40static int test_current_pid_tgid_tp(void *args)
41{
42 struct test_ns_current_pid_tgid__bss *bss;
43 struct test_ns_current_pid_tgid *skel;
44 int ret = -1, err;
45 pid_t tgid, pid;
46
47 skel = test_ns_current_pid_tgid__open();
48 if (!ASSERT_OK_PTR(skel, "test_ns_current_pid_tgid__open"))
49 return ret;
50
51 bpf_program__set_autoload(skel->progs.tp_handler, true);
52
53 err = test_ns_current_pid_tgid__load(skel);
54 if (!ASSERT_OK(err, "test_ns_current_pid_tgid__load"))
55 goto cleanup;
56
57 bss = skel->bss;
58 if (get_pid_tgid(&pid, &tgid, bss))
59 goto cleanup;
60
61 err = test_ns_current_pid_tgid__attach(skel);
62 if (!ASSERT_OK(err, "test_ns_current_pid_tgid__attach"))
63 goto cleanup;
64
65 /* trigger tracepoint */
66 usleep(1);
67 if (!ASSERT_EQ(bss->user_pid, pid, "pid"))
68 goto cleanup;
69 if (!ASSERT_EQ(bss->user_tgid, tgid, "tgid"))
70 goto cleanup;
71 ret = 0;
72
73cleanup:
74 test_ns_current_pid_tgid__destroy(skel);
75 return ret;
76}
77
78static int test_current_pid_tgid_cgrp(void *args)
79{
80 struct test_ns_current_pid_tgid__bss *bss;
81 struct test_ns_current_pid_tgid *skel;
82 int server_fd = -1, ret = -1, err;
83 int cgroup_fd = *(int *)args;
84 pid_t tgid, pid;
85
86 skel = test_ns_current_pid_tgid__open();
87 if (!ASSERT_OK_PTR(skel, "test_ns_current_pid_tgid__open"))
88 return ret;
89
90 bpf_program__set_autoload(skel->progs.cgroup_bind4, true);
91
92 err = test_ns_current_pid_tgid__load(skel);
93 if (!ASSERT_OK(err, "test_ns_current_pid_tgid__load"))
94 goto cleanup;
95
96 bss = skel->bss;
97 if (get_pid_tgid(&pid, &tgid, bss))
98 goto cleanup;
99
100 skel->links.cgroup_bind4 = bpf_program__attach_cgroup(
101 skel->progs.cgroup_bind4, cgroup_fd);
102 if (!ASSERT_OK_PTR(skel->links.cgroup_bind4, "bpf_program__attach_cgroup"))
103 goto cleanup;
104
105 server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
106 if (!ASSERT_GE(server_fd, 0, "start_server"))
107 goto cleanup;
108
109 if (!ASSERT_EQ(bss->user_pid, pid, "pid"))
110 goto cleanup;
111 if (!ASSERT_EQ(bss->user_tgid, tgid, "tgid"))
112 goto cleanup;
113 ret = 0;
114
115cleanup:
116 if (server_fd >= 0)
117 close(server_fd);
118 test_ns_current_pid_tgid__destroy(skel);
119 return ret;
120}
121
122static int test_current_pid_tgid_sk_msg(void *args)
123{
124 int verdict, map, server_fd = -1, client_fd = -1;
125 struct test_ns_current_pid_tgid__bss *bss;
126 static const char send_msg[] = "message";
127 struct test_ns_current_pid_tgid *skel;
128 int ret = -1, err, key = 0;
129 pid_t tgid, pid;
130
131 skel = test_ns_current_pid_tgid__open();
132 if (!ASSERT_OK_PTR(skel, "test_ns_current_pid_tgid__open"))
133 return ret;
134
135 bpf_program__set_autoload(skel->progs.sk_msg, true);
136
137 err = test_ns_current_pid_tgid__load(skel);
138 if (!ASSERT_OK(err, "test_ns_current_pid_tgid__load"))
139 goto cleanup;
140
141 bss = skel->bss;
142 if (get_pid_tgid(&pid, &tgid, skel->bss))
143 goto cleanup;
144
145 verdict = bpf_program__fd(skel->progs.sk_msg);
146 map = bpf_map__fd(skel->maps.sock_map);
147 err = bpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
148 if (!ASSERT_OK(err, "prog_attach"))
149 goto cleanup;
150
151 server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
152 if (!ASSERT_GE(server_fd, 0, "start_server"))
153 goto cleanup;
154
155 client_fd = connect_to_fd(server_fd, 0);
156 if (!ASSERT_GE(client_fd, 0, "connect_to_fd"))
157 goto cleanup;
158
159 err = bpf_map_update_elem(map, &key, &client_fd, BPF_ANY);
160 if (!ASSERT_OK(err, "bpf_map_update_elem"))
161 goto cleanup;
162
163 err = send(client_fd, send_msg, sizeof(send_msg), 0);
164 if (!ASSERT_EQ(err, sizeof(send_msg), "send(msg)"))
165 goto cleanup;
166
167 if (!ASSERT_EQ(bss->user_pid, pid, "pid"))
168 goto cleanup;
169 if (!ASSERT_EQ(bss->user_tgid, tgid, "tgid"))
170 goto cleanup;
171 ret = 0;
172
173cleanup:
174 if (server_fd >= 0)
175 close(server_fd);
176 if (client_fd >= 0)
177 close(client_fd);
178 test_ns_current_pid_tgid__destroy(skel);
179 return ret;
180}
181
182static void test_ns_current_pid_tgid_new_ns(int (*fn)(void *), void *arg)
183{
184 int wstatus;
185 pid_t cpid;
186
187 /* Create a process in a new namespace, this process
188 * will be the init process of this new namespace hence will be pid 1.
189 */
190 cpid = clone(fn, child_stack + STACK_SIZE,
191 CLONE_NEWPID | SIGCHLD, arg);
192
193 if (!ASSERT_NEQ(cpid, -1, "clone"))
194 return;
195
196 if (!ASSERT_NEQ(waitpid(cpid, &wstatus, 0), -1, "waitpid"))
197 return;
198
199 if (!ASSERT_OK(WEXITSTATUS(wstatus), "newns_pidtgid"))
200 return;
201}
202
203static void test_in_netns(int (*fn)(void *), void *arg)
204{
205 struct nstoken *nstoken = NULL;
206
207 SYS(cleanup, "ip netns add ns_current_pid_tgid");
208 SYS(cleanup, "ip -net ns_current_pid_tgid link set dev lo up");
209
210 nstoken = open_netns("ns_current_pid_tgid");
211 if (!ASSERT_OK_PTR(nstoken, "open_netns"))
212 goto cleanup;
213
214 test_ns_current_pid_tgid_new_ns(fn, arg);
215
216cleanup:
217 if (nstoken)
218 close_netns(nstoken);
219 SYS_NOFAIL("ip netns del ns_current_pid_tgid");
220}
221
222/* TODO: use a different tracepoint */
223void serial_test_ns_current_pid_tgid(void)
224{
225 if (test__start_subtest("root_ns_tp"))
226 test_current_pid_tgid_tp(NULL);
227 if (test__start_subtest("new_ns_tp"))
228 test_ns_current_pid_tgid_new_ns(test_current_pid_tgid_tp, NULL);
229 if (test__start_subtest("new_ns_cgrp")) {
230 int cgroup_fd = -1;
231
232 cgroup_fd = test__join_cgroup("/sock_addr");
233 if (ASSERT_GE(cgroup_fd, 0, "join_cgroup")) {
234 test_in_netns(test_current_pid_tgid_cgrp, &cgroup_fd);
235 close(cgroup_fd);
236 }
237 }
238 if (test__start_subtest("new_ns_sk_msg"))
239 test_in_netns(test_current_pid_tgid_sk_msg, NULL);
240}
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
3
4#define _GNU_SOURCE
5#include <test_progs.h>
6#include "test_ns_current_pid_tgid.skel.h"
7#include <sys/stat.h>
8#include <sys/types.h>
9#include <unistd.h>
10#include <sys/syscall.h>
11#include <sched.h>
12#include <sys/wait.h>
13#include <sys/mount.h>
14#include <sys/fcntl.h>
15
16#define STACK_SIZE (1024 * 1024)
17static char child_stack[STACK_SIZE];
18
19static int test_current_pid_tgid(void *args)
20{
21 struct test_ns_current_pid_tgid__bss *bss;
22 struct test_ns_current_pid_tgid *skel;
23 int err = -1, duration = 0;
24 pid_t tgid, pid;
25 struct stat st;
26
27 skel = test_ns_current_pid_tgid__open_and_load();
28 if (CHECK(!skel, "skel_open_load", "failed to load skeleton\n"))
29 goto cleanup;
30
31 pid = syscall(SYS_gettid);
32 tgid = getpid();
33
34 err = stat("/proc/self/ns/pid", &st);
35 if (CHECK(err, "stat", "failed /proc/self/ns/pid: %d\n", err))
36 goto cleanup;
37
38 bss = skel->bss;
39 bss->dev = st.st_dev;
40 bss->ino = st.st_ino;
41 bss->user_pid = 0;
42 bss->user_tgid = 0;
43
44 err = test_ns_current_pid_tgid__attach(skel);
45 if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
46 goto cleanup;
47
48 /* trigger tracepoint */
49 usleep(1);
50 ASSERT_EQ(bss->user_pid, pid, "pid");
51 ASSERT_EQ(bss->user_tgid, tgid, "tgid");
52 err = 0;
53
54cleanup:
55 test_ns_current_pid_tgid__destroy(skel);
56
57 return err;
58}
59
60static void test_ns_current_pid_tgid_new_ns(void)
61{
62 int wstatus, duration = 0;
63 pid_t cpid;
64
65 /* Create a process in a new namespace, this process
66 * will be the init process of this new namespace hence will be pid 1.
67 */
68 cpid = clone(test_current_pid_tgid, child_stack + STACK_SIZE,
69 CLONE_NEWPID | SIGCHLD, NULL);
70
71 if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno)))
72 return;
73
74 if (CHECK(waitpid(cpid, &wstatus, 0) == -1, "waitpid", "%s\n", strerror(errno)))
75 return;
76
77 if (CHECK(WEXITSTATUS(wstatus) != 0, "newns_pidtgid", "failed"))
78 return;
79}
80
81/* TODO: use a different tracepoint */
82void serial_test_ns_current_pid_tgid(void)
83{
84 if (test__start_subtest("ns_current_pid_tgid_root_ns"))
85 test_current_pid_tgid(NULL);
86 if (test__start_subtest("ns_current_pid_tgid_new_ns"))
87 test_ns_current_pid_tgid_new_ns();
88}