zdtm: Netns basic test

Only checks for lo, one simple ifaddr and two routes are handled. Sanity
test and nothing more.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -51,6 +51,7 @@ TST_NOFILE	=				\
 		pty00				\
 		tty00				\
 		mountpoints			\
+		netns				\
 		session01			\
 #		jobctl00			\
 

test/zdtm/live/static/netns.c

+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that network environment (links, addresses and routes) are preserved";
+const char *test_author	= "Pavel Emelianov <xemul@parallels.com>";
+
+static int test_fn(int argc, char **argv)
+{
+	if (system("ip link set lo up")) {
+		fail("Can't set lo up");
+		return -1;
+	}
+
+	if (system("ip addr add 1.2.3.4 dev lo")) {
+		fail("Can't add addr on lo");
+		return -1;
+	}
+
+	if (system("ip route add 1.2.3.5 dev lo")) {
+		fail("Can't add route via lo");
+		return -1;
+	}
+
+	if (system("ip route add 1.2.3.6 via 1.2.3.5")) {
+		fail("Can't add route via lo (2)");
+		return -1;
+	}
+
+	if (system("ip link > ip.dump && ip addr >> ip.dump && ip route >> ip.dump")) {
+		fail("Can't save net config");
+		return -1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (system("ip link > ip.rst && ip addr >> ip.rst && ip route >> ip.rst")) {
+		fail("Can't get net config");
+		return -1;
+	}
+
+	if (system("diff ip.rst ip.dump")) {
+		fail("Net config differs after restore");
+		return -1;
+	}
+
+	pass();
+	return 0;
+}
+
+#define CLONE_NEWNET     0x40000000
+
+int main(int argc, char **argv)
+{
+	test_init_ns(argc, argv, CLONE_NEWNET, test_fn);
+	return 0;
+}
+