zdtm: Test that sockets bound to device work

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -32,6 +32,7 @@ streaming/pipe_shared00
 transition/file_read
 static/sockets00
 static/sock_opts00
+static/sock_opts01
 static/sockets_spair
 static/sockets_dgram
 static/socket_queues

test/zdtm/live/static/Makefile

@@ -44,6 +44,7 @@ TST_NOFILE	=				\
 		socket_queues02			\
 		socket-tcp			\
 		sock_opts00			\
+		sock_opts01			\
 		ipc_namespace			\
 		selfexe00			\
 		sem				\

test/zdtm/live/static/sock_opts01.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <linux/if.h>
+
+#include "zdtmtst.h"
+
+const char *test_doc	= "Check that SO_BINDTODEVICE option works";
+const char *test_author	= "Pavel Emelyanov <xemul@parallels.com>";
+
+int main(int argc, char ** argv)
+{
+	int sock, ret, dev, dev2;
+	socklen_t len = sizeof(dev);
+
+	test_init(argc, argv);
+
+	sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+	if (sock < 0) {
+		err("can't create socket: %m");
+		return 1;
+	}
+
+	ret = setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);
+	if (ret < 0)
+		ret = setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, "lo", 3);
+	if (ret < 0) {
+		err("can't bind to eth0");
+		return 1;
+	}
+
+	ret = getsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &dev, &len);
+	if (ret < 0) {
+		err("can't get dev binding");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	ret = getsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &dev2, &len);
+	if (ret < 0) {
+		fail("can't get dev binding2");
+		return 1;
+	}
+
+	if (!dev2)
+		fail("unbound sock restored");
+	else if (dev != dev2)
+		fail("wrong bound device");
+	else
+		pass();
+
+	close(sock);
+
+	return 0;
+}