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181 lines
4.4 KiB
181 lines
4.4 KiB
/* Copyright (c) 2014 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of version 2 the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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* File: netns_netlink.c
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*
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* Tests a netlink interface inside a new network namespace.
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* Description:
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* 1. Unshares a network namespace (so network related actions
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* have no effect on a real system)
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* 2. 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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* 4. Child then waits for parent approval to receive data from socket
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* 3. 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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* 4. 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 "netns_helper.h"
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#include "test.h"
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#include "safe_macros.h"
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#define MAX_TRIES 1000
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#define IP_TUNTAP_MIN_VER 100519
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char *TCID = "netns_netlink";
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int TST_TOTAL = 1;
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static void cleanup(void)
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{
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tst_rmdir();
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}
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static void setup(void)
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{
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tst_require_root();
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check_iproute(IP_TUNTAP_MIN_VER);
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check_netns();
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tst_tmpdir();
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TST_CHECKPOINT_INIT(tst_rmdir);
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}
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int 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
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* 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 = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (fd == -1) {
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perror("socket");
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return 1;
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}
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if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
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perror("bind");
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close(fd);
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return 1;
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}
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/* waits for parent to create an interface */
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TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
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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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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
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* 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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close(fd);
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if (!event_found) {
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perror("recv");
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return 1;
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}
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return 0;
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}
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static void test(void)
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{
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pid_t pid;
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int status;
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/* unshares the network namespace */
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if (unshare(CLONE_NEWNET) == -1)
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tst_brkm(TBROK | TERRNO, cleanup, "unshare failed");
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pid = tst_fork();
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if (pid < 0) {
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tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
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}
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if (pid == 0) {
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_exit(child_func());
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}
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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_brkm(TBROK, cleanup, "system() 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_brkm(TBROK, cleanup, "system() failed");
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/* allow child to continue */
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TST_SAFE_CHECKPOINT_WAKE(cleanup, 0);
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SAFE_WAITPID(cleanup, pid, &status, 0);
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if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
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tst_resm(TFAIL, "netlink interface fail");
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return;
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}
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if (WIFSIGNALED(status)) {
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tst_resm(TFAIL, "child was killed with signal %s",
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tst_strsig(WTERMSIG(status)));
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return;
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}
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tst_resm(TPASS, "netlink interface pass");
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}
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int main(int argc, char *argv[])
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{
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int lc;
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tst_parse_opts(argc, argv, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++)
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test();
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cleanup();
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tst_exit();
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}
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