def testRfc6724Behaviour(self):
# [3] Get an IPv6 address back, in optimistic DAD start-up.
self.SetDAD(self.test_ifname, 1) # Enable DAD
self.SetOptimisticDAD(self.test_ifname, 1)
# Send a RA to start SLAAC and subsequent DAD.
self.SendRA(self.test_netid, 0)
# Get flags and prove optimism.
self.assertAddressHasExpectedAttributes(self.test_ip,
self.test_ifindex,
iproute.IFA_F_OPTIMISTIC)
# Optimistic addresses are usable but are not selected.
if net_test.LinuxVersion() >= (3, 18, 0):
# The version checked in to android kernels <= 3.10 requires the
# use_optimistic sysctl to be turned on.
self.assertAddressUsable(self.test_ip, self.test_netid)
self.assertAddressNotSelected(self.test_ip, self.test_netid)
# Busy wait for DAD to complete (should be less than 1 second).
self.WaitForDad(self.test_ip)
# The test_ip should have completed DAD by now, and should be the
# chosen source address.
self.assertAddressUsable(self.test_ip, self.test_netid)
self.assertAddressSelected(self.test_ip, self.test_netid)
def testSendToOnlinkDestination(self):
# [3] Get an IPv6 address back, in optimistic DAD start-up.
self.SetDAD(self.test_ifname, 1) # Enable DAD
self.SetOptimisticDAD(self.test_ifname, 1)
self.SetUseOptimistic(self.test_ifname, 1)
# Send a RA to start SLAAC and subsequent DAD.
self.SendRA(self.test_netid, 0)
# Prove optimism and usability.
self.assertAddressHasExpectedAttributes(self.test_ip,
self.test_ifindex,
iproute.IFA_F_OPTIMISTIC)
self.assertAddressUsable(self.test_ip, self.test_netid)
self.assertAddressSelected(self.test_ip, self.test_netid)
# [4] Send to an on-link destination and observe a Neighbor Solicitation
# packet with a source address that is NOT the optimistic address.
# In this setup, the only usable address is the link-local address.
onlink_dest = self.GetRandomDestination(
self.IPv6Prefix(self.test_netid))
self.SendWithSourceAddress(self.test_ip, self.test_netid, onlink_dest)
if net_test.LinuxVersion() >= (3, 18, 0):
# Older versions will actually choose the optimistic address to
# originate Neighbor Solications (RFC violation).
expected_ns = packets.NS(self.test_lladdr, onlink_dest,
self.MyMacAddress(self.test_netid))[1]
self.ExpectPacketOn(self.test_netid, "link-local NS", expected_ns)
class NoNsFromOptimisticTest(MultiInterfaceSourceAddressSelectionTest):
@unittest.skipUnless(HAVE_USE_OPTIMISTIC, "use_optimistic not supported")
@unittest.skipUnless(net_test.LinuxVersion() >= (3, 18, 0),
"correct optimistic bind() not supported")
def testSendToOnlinkDestination(self):
# [3] Get an IPv6 address back, in optimistic DAD start-up.
self.SetDAD(self.test_ifname, 1) # Enable DAD
self.SetOptimisticDAD(self.test_ifname, 1)
self.SetUseOptimistic(self.test_ifname, 1)
# Send a RA to start SLAAC and subsequent DAD.
self.SendRA(self.test_netid, 0)
# Prove optimism and usability.
self.assertAddressHasExpectedAttributes(self.test_ip,
self.test_ifindex,
iproute.IFA_F_OPTIMISTIC)
self.assertAddressUsable(self.test_ip, self.test_netid)
self.assertAddressSelected(self.test_ip, self.test_netid)
# [4] Send to an on-link destination and observe a Neighbor Solicitation
# packet with a source address that is NOT the optimistic address.
# In this setup, the only usable address is the link-local address.
onlink_dest = self.GetRandomDestination(
self.IPv6Prefix(self.test_netid))
self.SendWithSourceAddress(self.test_ip, self.test_netid, onlink_dest)
expected_ns = multinetwork_test.Packets.NS(
net_test.GetLinkAddress(self.test_ifname, True), onlink_dest,
self.MyMacAddress(self.test_netid))[1]
self.ExpectPacketOn(self.test_netid, "link-local NS", expected_ns)