1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2017 Oracle and/or its affiliates. All Rights Reserved.
4 */
5
6 #define _GNU_SOURCE
7 #include <stdlib.h>
8 #include <errno.h>
9
10 #include "tst_test.h"
11 #include "clone_platform.h"
12 #include "lapi/syscalls.h"
13 #include "lapi/sched.h"
14
15 static void *child_stack;
16 static int sysctl_net = -1;
17 static int sysctl_net_new = -1;
18 static const char sysctl_path[] = "/proc/sys/net/ipv4/conf/lo/tag";
19 static const char sysctl_path_def[] = "/proc/sys/net/ipv4/conf/default/tag";
20 static int flags = CLONE_NEWNET | CLONE_VM | SIGCHLD;
21
setup(void)22 static void setup(void)
23 {
24 child_stack = SAFE_MALLOC(CHILD_STACK_SIZE);
25 }
26
cleanup(void)27 static void cleanup(void)
28 {
29 if (sysctl_net != -1)
30 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
31
32 free(child_stack);
33 }
34
newnet(void * arg LTP_ATTRIBUTE_UNUSED)35 static int newnet(void *arg LTP_ATTRIBUTE_UNUSED)
36 {
37 SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net_new);
38 tst_syscall(__NR_exit, 0);
39 return 0;
40 }
41
clone_child(void)42 static long clone_child(void)
43 {
44 TEST(ltp_clone(flags, newnet, NULL, CHILD_STACK_SIZE, child_stack));
45
46 if (TST_RET == -1 && TST_ERR == EINVAL)
47 tst_brk(TCONF, "CONFIG_NET_NS was disabled");
48
49 if (TST_RET == -1)
50 tst_brk(TBROK | TTERRNO, "clone(CLONE_NEWNET) failed");
51
52 return TST_RET;
53 }
54
do_test(void)55 static void do_test(void)
56 {
57 int def_val;
58
59 tst_res(TINFO, "create clone in a new netns with 'CLONE_NEWNET' flag");
60
61 SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net);
62 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net + 1);
63
64 clone_child();
65 tst_reap_children();
66
67 if (sysctl_net_new == (sysctl_net + 1)) {
68 tst_res(TFAIL, "sysctl params equal: %s=%d",
69 sysctl_path, sysctl_net_new);
70 }
71
72 SAFE_FILE_SCANF(sysctl_path_def, "%d", &def_val);
73
74 if (sysctl_net_new != def_val) {
75 tst_res(TFAIL, "netns param init to non-default value %d",
76 sysctl_net_new);
77 }
78
79 /* restore previous value */
80 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
81
82 tst_res(TPASS, "sysctl params differ in new netns");
83 }
84
85 static struct tst_test test = {
86 .test_all = do_test,
87 .setup = setup,
88 .cleanup = cleanup,
89 .needs_root = 1,
90 };
91