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93 lines
2.0 KiB
93 lines
2.0 KiB
7 months ago
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2017 Oracle and/or its affiliates. All Rights Reserved.
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*/
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#define _GNU_SOURCE
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#include <sched.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "tst_test.h"
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#include "clone_platform.h"
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#include "lapi/syscalls.h"
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#include "lapi/namespaces_constants.h"
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static void *child_stack;
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static int sysctl_net = -1;
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static int sysctl_net_new = -1;
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static const char sysctl_path[] = "/proc/sys/net/ipv4/conf/lo/tag";
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static const char sysctl_path_def[] = "/proc/sys/net/ipv4/conf/default/tag";
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static int flags = CLONE_NEWNET | CLONE_VM | SIGCHLD;
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static void setup(void)
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{
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child_stack = SAFE_MALLOC(CHILD_STACK_SIZE);
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}
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static void cleanup(void)
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{
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if (sysctl_net != -1)
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SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
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free(child_stack);
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}
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static int newnet(void *arg LTP_ATTRIBUTE_UNUSED)
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{
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SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net_new);
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tst_syscall(__NR_exit, 0);
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return 0;
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}
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static long clone_child(void)
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{
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TEST(ltp_clone(flags, newnet, NULL, CHILD_STACK_SIZE, child_stack));
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if (TST_RET == -1 && TST_ERR == EINVAL)
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tst_brk(TCONF, "CONFIG_NET_NS was disabled");
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if (TST_RET == -1)
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tst_brk(TBROK | TTERRNO, "clone(CLONE_NEWNET) failed");
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return TST_RET;
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}
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static void do_test(void)
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{
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int def_val;
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tst_res(TINFO, "create clone in a new netns with 'CLONE_NEWNET' flag");
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SAFE_FILE_SCANF(sysctl_path, "%d", &sysctl_net);
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SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net + 1);
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clone_child();
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tst_reap_children();
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if (sysctl_net_new == (sysctl_net + 1)) {
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tst_res(TFAIL, "sysctl params equal: %s=%d",
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sysctl_path, sysctl_net_new);
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}
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SAFE_FILE_SCANF(sysctl_path_def, "%d", &def_val);
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if (sysctl_net_new != def_val) {
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tst_res(TFAIL, "netns param init to non-default value %d",
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sysctl_net_new);
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}
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/* restore previous value */
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SAFE_FILE_PRINTF(sysctl_path, "%d", sysctl_net);
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tst_res(TPASS, "sysctl params differ in new netns");
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}
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static struct tst_test test = {
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.test_all = do_test,
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.setup = setup,
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.cleanup = cleanup,
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.needs_root = 1,
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.min_kver = "2.6.24",
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};
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