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 <sched.h>
8 #include <stdlib.h>
9 #include <errno.h>
10
11 #include "tst_test.h"
12 #include "clone_platform.h"
13 #include "lapi/syscalls.h"
14 #include "lapi/namespaces_constants.h"
15
16 static void *child_stack;
17 static int sysctl_net = -1;
18 static int sysctl_net_new = -1;
19 static const char sysctl_path[] = "/proc/sys/net/ipv4/conf/lo/tag";
20 static const char sysctl_path_def[] = "/proc/sys/net/ipv4/conf/default/tag";
21 static int flags = CLONE_NEWNET | CLONE_VM | SIGCHLD;
22
setup(void)23 static void setup(void)
24 {
25 child_stack = SAFE_MALLOC(CHILD_STACK_SIZE);
26 }
27
cleanup(void)28 static void cleanup(void)
29 {
30 if (sysctl_net != -1)
31 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
32
33 free(child_stack);
34 }
35
newnet(void * arg LTP_ATTRIBUTE_UNUSED)36 static int newnet(void *arg LTP_ATTRIBUTE_UNUSED)
37 {
38 SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net_new);
39 tst_syscall(__NR_exit, 0);
40 return 0;
41 }
42
clone_child(void)43 static long clone_child(void)
44 {
45 TEST(ltp_clone(flags, newnet, NULL, CHILD_STACK_SIZE, child_stack));
46
47 if (TST_RET == -1 && TST_ERR == EINVAL)
48 tst_brk(TCONF, "CONFIG_NET_NS was disabled");
49
50 if (TST_RET == -1)
51 tst_brk(TBROK | TTERRNO, "clone(CLONE_NEWNET) failed");
52
53 return TST_RET;
54 }
55
do_test(void)56 static void do_test(void)
57 {
58 int def_val;
59
60 tst_res(TINFO, "create clone in a new netns with 'CLONE_NEWNET' flag");
61
62 SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net);
63 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net + 1);
64
65 clone_child();
66 tst_reap_children();
67
68 if (sysctl_net_new == (sysctl_net + 1)) {
69 tst_res(TFAIL, "sysctl params equal: %s=%d",
70 sysctl_path, sysctl_net_new);
71 }
72
73 SAFE_FILE_SCANF(sysctl_path_def, "%d", &def_val);
74
75 if (sysctl_net_new != def_val) {
76 tst_res(TFAIL, "netns param init to non-default value %d",
77 sysctl_net_new);
78 }
79
80 /* restore previous value */
81 SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
82
83 tst_res(TPASS, "sysctl params differ in new netns");
84 }
85
86 static struct tst_test test = {
87 .test_all = do_test,
88 .setup = setup,
89 .cleanup = cleanup,
90 .needs_root = 1,
91 .min_kver = "2.6.24",
92 };
93