1 /*
2 * Copyright (c) International Business Machines Corp., 2008
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
11 * the GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Author: Veerendra C <vechandr@in.ibm.com>
17 *
18 * Net namespaces were introduced around 2.6.25. Kernels before that,
19 * assume they are not enabled. Kernels after that, check for -EINVAL
20 * when trying to use CLONE_NEWNET and CLONE_NEWNS.
21 ***************************************************************************/
22
23 #define _GNU_SOURCE
24 #include <sched.h>
25 #include "config.h"
26 #include "libclone.h"
27 #include "linux_syscall_numbers.h"
28 #include "test.h"
29 #include "safe_macros.h"
30
31 #ifndef CLONE_NEWNS
32 #define CLONE_NEWNS -1
33 #endif
34
check_iproute(unsigned int spe_ipver)35 static void check_iproute(unsigned int spe_ipver)
36 {
37 FILE *ipf;
38 int n;
39 unsigned int ipver = 0;
40
41 ipf = popen("ip -V", "r");
42 if (ipf == NULL)
43 tst_brkm(TCONF, NULL,
44 "Failed while opening pipe for iproute check");
45
46 n = fscanf(ipf, "ip utility, iproute2-ss%u", &ipver);
47 if (n < 1) {
48 tst_brkm(TCONF, NULL,
49 "Failed while obtaining version for iproute check");
50 }
51 if (ipver < spe_ipver) {
52 tst_brkm(TCONF, NULL, "The commands in iproute tools do "
53 "not support required objects");
54 }
55
56 pclose(ipf);
57 }
58
dummy(void * arg)59 static int dummy(void *arg)
60 {
61 (void) arg;
62 return 0;
63 }
64
check_netns(void)65 static void check_netns(void)
66 {
67 int pid, status;
68 /* Checking if the kernel supports unshare with netns capabilities. */
69 if (CLONE_NEWNS == -1)
70 tst_brkm(TCONF | TERRNO, NULL, "CLONE_NEWNS (%d) not supported",
71 CLONE_NEWNS);
72
73 pid = do_clone_unshare_test(T_UNSHARE, CLONE_NEWNET | CLONE_NEWNS,
74 dummy, NULL);
75 if (pid == -1)
76 tst_brkm(TCONF | TERRNO, NULL,
77 "unshare syscall smoke test failed");
78
79 SAFE_WAIT(NULL, &status);
80 }
81