tests: add a test for macvlan

Note that this test doesn't run in uns mode, even though we have support
for that. Without a full container engine, I couldn't think of a nice way
to pass a macvlan device into the zdtm "container" when in UNS mode.

v2: use the nsid_manip feature flag

travis-ci: success for series starting with [v10,01/11] net: pass the struct nlattrs to dump() functions
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/static/Makefile

@@ -152,6 +152,7 @@ TST_NOFILE	:=				\
 		cgroupns			\
 		helper_zombie_child		\
 		clone_fs			\
+		macvlan			\
 #		jobctl00			\
 
 ifneq ($(SRCARCH),arm)

test/zdtm/static/macvlan.c

+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/mount.h>
+#include <linux/limits.h>
+#include <signal.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include "zdtmtst.h"
+
+const char *test_doc	= "check that macvlan interfaces are c/r'd correctly";
+const char *test_author	= "Tycho Andersen <tycho.andersen@canonical.com>";
+
+#define BRIDGE_NAME "zdtmbr0"
+#define IF_NAME "zdtmmvlan0"
+
+static bool wait_for_macvlan(void)
+{
+	int i;
+
+	for (i = 0; i < 10; i++) {
+		if (system("ip addr list dev " IF_NAME) == 0)
+			return true;
+
+		sleep(1);
+	}
+
+	return false;
+}
+
+int main(int argc, char **argv)
+{
+	int ret = 1;
+
+	test_init(argc, argv);
+
+	if (!wait_for_macvlan()) {
+		fail("failed to inject macvlan device\n");
+		return 1;
+	}
+
+	if (system("ip addr list dev " IF_NAME " > macvlan.dump.test")) {
+		fail("can't save net config");
+		goto out;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (system("ip addr list dev " IF_NAME " > macvlan.rst.test")) {
+		fail("can't get net config");
+		goto out;
+	}
+
+	if (system("diff macvlan.rst.test macvlan.dump.test")) {
+		fail("Net config differs after restore");
+		goto out;
+	}
+
+	pass();
+	ret = 0;
+
+out:
+	return ret;
+}

test/zdtm/static/macvlan.desc

+{'flavor': 'ns uns', 'deps': [ '/bin/sh', '/usr/bin/sort', '/bin/grep', '/sbin/ip', '/usr/bin/diff'], 'flags': 'suid', 'ropts': '--external macvlan[zdtmmvlan0]:zdtmbr0', 'feature': 'nsid_manip'}

test/zdtm/static/macvlan.hook

+#!/bin/bash
+
+[ "$1" == "--clean" -o "$1" == "--pre-restore" -o "$1" == "--post-start" ] || exit 0
+
+if [ "$1" == "--post-start" ]; then
+	set -e
+
+	i=0
+	while [ -z "$(pidof -s macvlan)" ]; do
+		i=$(($i+1))
+		if [ "$i" -eq "10" ]; then
+			echo "failed to create macvlan test"
+			exit 1
+		fi
+		sleep 1
+	done
+
+	ip link add zdtmbr0 type bridge
+	ip addr add 10.0.55.55/32 dev zdtmbr0
+	ip link set zdtmbr0 up
+	ip link add zdtmmvlan0 link zdtmbr0 type macvlan mode bridge
+	ip addr add 10.0.55.56/32 dev zdtmmvlan0
+	ip link set zdtmmvlan0 netns $(pidof -s macvlan)
+else
+	ip link del zdtmmvlan0 || true
+
+	[ "$1" == "--clean" ] || exit 0
+
+	ip link del zdtmbr0 || true
+fi