* Tests a netlink interface inside a new network namespace
Signed-off-by: Matus Marhefka <[email protected]>
---
runtest/containers | 1 +
testcases/kernel/containers/netns/.gitignore | 1 +
testcases/kernel/containers/netns/Makefile | 2 +-
testcases/kernel/containers/netns/netns_netlink.c | 175 ++++++++++++++++++++++
4 files changed, 178 insertions(+), 1 deletion(-)
create mode 100644 testcases/kernel/containers/netns/netns_netlink.c
diff --git a/runtest/containers b/runtest/containers
index 8e8e067..7d01a44 100644
--- a/runtest/containers
+++ b/runtest/containers
@@ -28,6 +28,7 @@ netns_two_children_ns netns_two_children_ns
netns_crtchild_delchild netns_crtchild_delchild
netns_par_chld_ipv6 netns_par_chld_ipv6
netns_par_chld_ftp netns_par_chld_ftp.sh
+netns_netlink netns_netlink
shmnstest_none shmnstest none
shmnstest_clone shmnstest clone
diff --git a/testcases/kernel/containers/netns/.gitignore
b/testcases/kernel/containers/netns/.gitignore
index e096adc..65f96be 100644
--- a/testcases/kernel/containers/netns/.gitignore
+++ b/testcases/kernel/containers/netns/.gitignore
@@ -5,3 +5,4 @@
/netns_par_chld_ipv6
/netns_sysfsview
/netns_two_children_ns
+/netns_netlink
diff --git a/testcases/kernel/containers/netns/Makefile
b/testcases/kernel/containers/netns/Makefile
index cdda23b..eea0d88 100644
--- a/testcases/kernel/containers/netns/Makefile
+++ b/testcases/kernel/containers/netns/Makefile
@@ -31,7 +31,7 @@ LDLIBS += -lclone
MAKE_TARGETS := netns_create_container netns_crtchild \
netns_crtchild_delchild netns_par_chld_ftp \
netns_par_chld_ipv6 netns_sysfsview \
- netns_two_children_ns
+ netns_two_children_ns netns_netlink
$(MAKE_TARGETS): %: common.o %.o
diff --git a/testcases/kernel/containers/netns/netns_netlink.c
b/testcases/kernel/containers/netns/netns_netlink.c
new file mode 100644
index 0000000..fbeda4d
--- /dev/null
+++ b/testcases/kernel/containers/netns/netns_netlink.c
@@ -0,0 +1,175 @@
+/* Copyright (c) 2014 Red Hat, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of version 2 the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ * File: netns_netlink.c
+ *
+ * Tests a netlink interface inside a new network namespace.
+ * Description:
+ * 1. Unshares a network namespace (so network related actions
+ * have no effect on a real system)
+ * 2. Forks a child which creates a NETLINK_ROUTE netlink socket
+ * and listens to RTMGRP_LINK (network interface create/delete/up/down)
+ * multicast group.
+ * 4. Child then waits for parent approval to receive data from socket
+ * 3. Parent creates a new TAP interface (dummy0) and immediately
+ * removes it (which should generate some data in child's netlink socket).
+ * Then it allows child to continue.
+ * 4. As the child was listening to RTMGRP_LINK multicast group, it should
+ * detect the new interface creation (by reading data from netlink socket),
+ * if so, the test passes, otherwise it fails.
+ */
+
+#define _GNU_SOURCE
+#include <sys/wait.h>
+#include <asm/types.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "usctest.h"
+#include "test.h"
+#include "safe_macros.h"
+#include "netns_helper.h"
+
+
+char *TCID = "netns_netlink";
+int TST_TOTAL = 1;
+int pipefd[2];
+
+
+static void cleanup(void)
+{
+ close(pipefd[0]);
+ close(pipefd[1]);
+}
+
+static void setup(void)
+{
+ tst_require_root(NULL);
+ check_netns();
+}
+
+int child_func(void)
+{
+ int fd, len;
+ struct sockaddr_nl sa;
+ char c, buffer[4096];
+ struct nlmsghdr *nlh;
+
+ /* child will listen to a network interface create/delete/up/down
+ * events */
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ sa.nl_groups = RTMGRP_LINK;
+
+ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+ if (fd == -1) {
+ perror("socket");
+ return 1;
+ }
+ if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
+ perror("bind");
+ return 1;
+ }
+
+ /* waits for parent to create an interface */
+ read(pipefd[0], &c, 1);
+
+ nlh = (struct nlmsghdr *) buffer;
+ /* non-blocking recv call */
+ while ((len = recv(fd, nlh, sizeof(buffer), MSG_DONTWAIT)) > 0) {
+ /* stop receiving only on interface create event */
+ if (nlh->nlmsg_type == RTM_NEWLINK)
+ break;
+ }
+
+ if (len == -1) {
+ perror("recv");
+ return 1;
+ }
+
+ return 0;
+}
+
+static void test(void)
+{
+ pid_t pid;
+ int status;
+
+ /* creates a pipe for synchronization between parent and child */
+ SAFE_PIPE(cleanup, pipefd);
+
+ /* unshares the network namespace */
+ if (unshare(CLONE_NEWNET) == -1)
+ tst_brkm(TBROK | TERRNO, cleanup, "unshare failed");
+
+ pid = fork();
+ if (pid < 0) { /* error */
+ tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
+ }
+ if (pid == 0) { /* child */
+ _exit(child_func());
+ }
+
+ /* parent */
+ /* creates TAP network interface dummy0 */
+ if (WEXITSTATUS(system("ip tuntap add dev dummy0 mode tap")) == -1)
+ tst_brkm(TBROK | TERRNO, cleanup, "system failed");
+
+ /* removes previously created dummy0 device */
+ if (WEXITSTATUS(system("ip tuntap del mode tap dummy0")) == -1)
+ tst_brkm(TBROK | TERRNO, cleanup, "system failed");
+
+ /* allow child to continue */
+ SAFE_WRITE(cleanup, 0, pipefd[1], "0", 1);
+
+
+ SAFE_WAITPID(cleanup, pid, &status, 0);
+ if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
+ tst_resm(TFAIL, "netlink interface fail");
+ return;
+ }
+ if (WIFSIGNALED(status)) {
+ tst_resm(TFAIL, "child was killed with signal %s",
+ tst_strsig(WTERMSIG(status)));
+ return;
+ }
+
+ tst_resm(TPASS, "netlink interface pass");
+}
+
+int main(int argc, char *argv[])
+{
+ const char *msg;
+ int lc;
+
+ msg = parse_opts(argc, argv, NULL, NULL);
+ if (msg != NULL)
+ tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
+
+ setup();
+
+ for (lc = 0; TEST_LOOPING(lc); lc++) {
+ test();
+ cleanup();
+ /* To get rid of "resource temporarily unavalable" errors
+ * when testing with -i option */
+ sleep(1);
+ }
+
+ tst_exit();
+}
--
1.8.3.1
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