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