[PATCH v2 10/17] KVM-test: Add a subtest of multicast

[Amos Kong <akong@redhat.com>]

Use 'ping' to test send/recive multicat packets. Flood ping test is also added.
Limit guest network as 'bridge' mode, because multicast packets could not be
transmitted to guest when using 'user' network.
Add join_mcast.py for joining machine into multicast groups.

Changes from v1:
- Just flush the firewall rules with iptables -F

Signed-off-by: Amos Kong <akong@redhat.com>
---
 0 files changed, 0 insertions(+), 0 deletions(-)

diff --git a/client/tests/kvm/scripts/join_mcast.py b/client/tests/kvm/scripts/join_mcast.py
new file mode 100755
index 0000000..0d90e5c
--- /dev/null
+++ b/client/tests/kvm/scripts/join_mcast.py
@@ -0,0 +1,29 @@
+import socket, struct, os, signal, sys
+# this script is used to join machine into multicast groups
+# author: Amos Kong <akong@redhat.com>
+
+if len(sys.argv) < 4:
+    print """%s [mgroup_count] [prefix] [suffix]
+    mgroup_count: count of multicast addresses
+    prefix: multicast address prefix
+    suffix: multicast address suffix""" % sys.argv[0]
+    sys.exit()
+
+mgroup_count = int(sys.argv[1])
+prefix = sys.argv[2]
+suffix = int(sys.argv[3])
+
+s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+for i in range(mgroup_count):
+    mcast = prefix + "." + str(suffix + i)
+    try:
+        mreq = struct.pack("4sl", socket.inet_aton(mcast), socket.INADDR_ANY)
+        s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
+    except:
+        s.close()
+        print "Could not join multicast: %s" % mcast
+        raise
+
+print "join_mcast_pid:%s" % os.getpid()
+os.kill(os.getpid(), signal.SIGSTOP)
+s.close()
diff --git a/client/tests/kvm/tests/multicast.py b/client/tests/kvm/tests/multicast.py
new file mode 100644
index 0000000..d0084f1
--- /dev/null
+++ b/client/tests/kvm/tests/multicast.py
@@ -0,0 +1,72 @@
+import logging, os, re
+from autotest_lib.client.common_lib import error
+from autotest_lib.client.bin import utils
+import kvm_test_utils
+
+
+def run_multicast(test, params, env):
+    """
+    Test multicast function of nic (rtl8139/e1000/virtio)
+
+    1) Create a VM
+    2) Join guest into multicast groups
+    3) Ping multicast addresses on host
+    4) Flood ping test with different size of packets
+    5) Final ping test and check if lose packet
+
+    @param test: Kvm test object
+    @param params: Dictionary with the test parameters.
+    @param env: Dictionary with test environment.
+    """
+    vm = kvm_test_utils.get_living_vm(env, params.get("main_vm"))
+    session = kvm_test_utils.wait_for_login(vm,
+                  timeout=int(params.get("login_timeout", 360)))
+
+    # flush the firewall rules
+    cmd = "iptables -F; test -e /selinux/enforce && echo 0 >/selinux/enforce"
+    session.get_command_status(cmd)
+    utils.run(cmd)
+    # make sure guest replies to broadcasts
+    session.get_command_status("echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore"
+            "_broadcasts && echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all")
+
+    # base multicast address
+    mcast = params.get("mcast", "225.0.0.1")
+    # count of multicast addresses, less than 20
+    mgroup_count = int(params.get("mgroup_count", 5))
+    flood_minutes = float(params.get("flood_minutes", 10))
+    ifname = vm.get_ifname()
+    prefix = re.findall("\d+.\d+.\d+", mcast)[0]
+    suffix = int(re.findall("\d+", mcast)[-1])
+    # copy python script to guest for joining guest to multicast groups
+    mcast_path = os.path.join(test.bindir, "scripts/join_mcast.py")
+    if not vm.copy_files_to(mcast_path, "/tmp"):
+        raise error.TestError("Fail to copy %s to guest" % mcast_path)
+    output = session.get_command_output("python /tmp/join_mcast.py %d %s %d" %
+                                        (mgroup_count, prefix, suffix))
+    # if success to join multicast, the process will be paused, and return pid.
+    try:
+        pid = re.findall("join_mcast_pid:(\d+)", output)[0]
+    except IndexError:
+        raise error.TestFail("Can't join multicast groups,output:%s" % output)
+
+    try:
+        for i in range(mgroup_count):
+            new_suffix = suffix + i
+            mcast = "%s.%d" % (prefix, new_suffix)
+            logging.info("Initial ping test, mcast: %s", mcast)
+            s, o = kvm_test_utils.ping(mcast, 10, interface=ifname, timeout=20)
+            if s != 0:
+                raise error.TestFail(" Ping return non-zero value %s" % o)
+            logging.info("Flood ping test, mcast: %s", mcast)
+            kvm_test_utils.ping(mcast, None, interface=ifname, flood=True,
+                               output_func=None, timeout=flood_minutes*60)
+            logging.info("Final ping test, mcast: %s", mcast)
+            s, o = kvm_test_utils.ping(mcast, 10, interface=ifname, timeout=20)
+            if s != 0:
+                raise error.TestFail("Ping failed, status: %s, output: %s"
+                                     % (s, o))
+    finally:
+        logging.debug(session.get_command_output("ipmaddr show"))
+        session.get_command_output("kill -s SIGCONT %s" % pid)
+        session.close()
diff --git a/client/tests/kvm/tests_base.cfg.sample b/client/tests/kvm/tests_base.cfg.sample
index 89ec4b0..a53ab64 100644
--- a/client/tests/kvm/tests_base.cfg.sample
+++ b/client/tests/kvm/tests_base.cfg.sample
@@ -378,6 +378,13 @@ variants:
         type = nic_promisc
         file_size = 1, 1460, 65000, 100000000
 
+    - multicast: install setup unattended_install.cdrom
+        type = multicast
+        nic_mode = tap
+        mcast = 225.0.0.1
+        mgroup_count = 20
+        flood_minutes = 1
+
     - physical_resources_check: install setup unattended_install.cdrom
         type = physical_resources_check
         catch_uuid_cmd = dmidecode | awk -F: '/UUID/ {print $2}'
@@ -1076,7 +1083,7 @@ variants:
 
     # Windows section
     - @Windows:
-        no autotest linux_s3 vlan_tag ioquit unattended_install.(url|nfs|remote_ks) jumbo file_transfer nicdriver_unload nic_promisc
+        no autotest linux_s3 vlan_tag ioquit unattended_install.(url|nfs|remote_ks) jumbo file_transfer nicdriver_unload nic_promisc multicast
         shutdown_command = shutdown /s /f /t 0
         reboot_command = shutdown /r /f /t 0
         status_test_command = echo %errorlevel%