127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 Red Hat, Inc.
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* Copyright (c) 2021 Petr Vorel <pvorel@suse.cz>
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*/
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/*\
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* [DESCRIPTION]
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*
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* Tests a netlink interface inside a new network namespace.
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*
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* - Unshares a network namespace (so network related actions
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* have no effect on a real system).
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* - Forks a child which creates a NETLINK_ROUTE netlink socket
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* and listens to RTMGRP_LINK (network interface create/delete/up/down)
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* multicast group.
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* - Child then waits for parent approval to receive data from socket
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* - Parent creates a new TAP interface (dummy0) and immediately
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* removes it (which should generate some data in child's netlink socket).
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* Then it allows child to continue.
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* - As the child was listening to RTMGRP_LINK multicast group, it should
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* detect the new interface creation/deletion (by reading data from netlink
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* socket), if so, the test passes, otherwise it fails.
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*/
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#define _GNU_SOURCE
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#include <sys/wait.h>
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#include <asm/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sched.h>
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#include "tst_test.h"
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#include "tst_safe_macros.h"
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#include "lapi/namespaces_constants.h"
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#define MAX_TRIES 1000
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static void child_func(void)
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{
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int fd, len, event_found, tries;
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struct sockaddr_nl sa;
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char buffer[4096];
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struct nlmsghdr *nlh;
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/* child will listen to a network interface create/delete/up/down events */
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memset(&sa, 0, sizeof(sa));
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sa.nl_family = AF_NETLINK;
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sa.nl_groups = RTMGRP_LINK;
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fd = SAFE_SOCKET(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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SAFE_BIND(fd, (struct sockaddr *) &sa, sizeof(sa));
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/* waits for parent to create an interface */
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TST_CHECKPOINT_WAIT(0);
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/*
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* To get rid of "resource temporarily unavailable" errors
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* when testing with -i option
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*/
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tries = 0;
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event_found = 0;
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nlh = (struct nlmsghdr *) buffer;
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while (tries < MAX_TRIES) {
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len = recv(fd, nlh, sizeof(buffer), MSG_DONTWAIT);
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if (len > 0) {
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/* stop receiving only on interface create/delete event */
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if (nlh->nlmsg_type == RTM_NEWLINK ||
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nlh->nlmsg_type == RTM_DELLINK) {
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event_found++;
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break;
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}
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}
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usleep(10000);
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tries++;
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}
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SAFE_CLOSE(fd);
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if (event_found)
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tst_res(TPASS, "interface changes detected");
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else
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tst_res(TFAIL, "failed to detect interface changes");
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exit(0);
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}
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static void test_netns_netlink(void)
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{
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/* unshares the network namespace */
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SAFE_UNSHARE(CLONE_NEWNET);
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if (SAFE_FORK() == 0)
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child_func();
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/* creates TAP network interface dummy0 */
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if (WEXITSTATUS(system("ip tuntap add dev dummy0 mode tap")))
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tst_brk(TBROK, "adding interface failed");
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/* removes previously created dummy0 device */
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if (WEXITSTATUS(system("ip tuntap del mode tap dummy0")))
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tst_brk(TBROK, "removing interface failed");
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/* allow child to continue */
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TST_CHECKPOINT_WAKE(0);
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tst_reap_children();
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}
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static struct tst_test test = {
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.test_all = test_netns_netlink,
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.needs_checkpoints = 1,
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.needs_tmpdir = 1,
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.needs_root = 1,
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.forks_child = 1,
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.needs_kconfigs = (const char *[]) {
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"CONFIG_NET_NS=y",
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NULL
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},
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};
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