def test_dhcpv6_simple_relay_reply_foreign_option(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptIfaceId(ifaceid=self.node_ifaceid) / \
DHCP6OptClientId() / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid))
result = self.send_and_exp_pkts(pkt, DHCP6_Reply, client=False)
self.assert_len(result, 1)
pkt = result[0]
self.assert_relayed_reply_pkt_w_trid(pkt, DHCP6_Reply)
self.assert_node_responsive()
def send_DHCPv6_Reply(self, pkt):
"""
Sends out the DHCPv6 Reply message.
"""
header = self.build_reply_headers(pkt)
trid = pkt[DHCP6_InfoRequest].trid
srv_duid = header[Ether].src
cli_id = DHCP6OptClientId(duid=pkt[DHCP6OptClientId].duid)
srv_id = DHCP6OptServerId(duid=DUID_LL(lladdr=srv_duid))
sendp(
header / DHCP6_Reply(trid=trid) / cli_id / srv_id,
iface=self.iface,
verbose=False,
)
def testfunc(child):
iface = os.environ["TAP"]
pkt = wait_for_dhcpv6_pkt(iface)
# the packet was a solicit
assert DHCP6_Solicit in pkt
# check if the sender is the upstream interface of the node
upstream_netif = get_upstream_netif(child)
print(upstream_netif)
upstream_hwaddrs = get_hwaddrs(child, upstream_netif)
assert DHCP6OptClientId in pkt and DUID_LL in pkt[DHCP6OptClientId].duid
assert pkt[DHCP6OptClientId].duid[DUID_LL].lladdr in upstream_hwaddrs
# and it is asking for a prefix delegation
assert DHCP6OptIA_PD in pkt
# reply to solicit with advertise and a prefix provided
trid = pkt[DHCP6_Solicit].trid
srv_duid = "aa:bb:cc:dd:ee:ff"
cli_id = DHCP6OptClientId(duid=pkt[DHCP6OptClientId].duid)
srv_id = DHCP6OptServerId(duid=DUID_LL(lladdr=srv_duid))
prefix = "2001:db8:{:x}:{:x}::".format(random.randint(0, 0xffff),
random.randint(0, 0xffff))
ia_pd = DHCP6OptIA_PD(T1=12000,
T2=13000,
iaid=pkt[DHCP6OptIA_PD].iaid,
iapdopt=[
DHCP6OptIAPrefix(preflft=14000,
validlft=15000,
prefix=prefix,
plen=64)
])
# start sniffer to catch incoming request
sniffer = start_sniffer(iface,
stop_filter=lambda pkt: DHCP6_Request in pkt)
sendp(build_reply_headers(pkt) / DHCP6_Advertise(trid=trid) / cli_id /
srv_id / ia_pd,
iface=iface,
verbose=False)
# wait for request
pkt = wait_for_dhcpv6_pkt(iface, sniffer)
# the packet was indeed a request
assert DHCP6_Request in pkt
# and from the client
assert DHCP6OptClientId in pkt and DUID_LL in pkt[DHCP6OptClientId].duid
assert pkt[DHCP6OptClientId].duid[DUID_LL].lladdr in upstream_hwaddrs
# and it is trying to talk to this server
assert DHCP6OptServerId in pkt and DUID_LL in pkt[DHCP6OptServerId].duid
assert pkt[DHCP6OptServerId].duid[DUID_LL].lladdr == srv_duid
# and is still asking for a prefix delegation
assert DHCP6OptIA_PD in pkt
# reply to request with reply and a prefix provided
trid = pkt[DHCP6_Request].trid
sendp(build_reply_headers(pkt) / DHCP6_Reply(trid=trid) / cli_id / srv_id /
ia_pd,
iface=iface,
verbose=False)
time.sleep(1)
# check if global address was configured
child.sendline("ifconfig {}".format(get_downstream_netif(child)))
# remove one trailing ':' from prefix just to be safe ;-)
child.expect(r"inet6 addr:\s+{}[0-9a-fA-F:]+\s".format(prefix[:-1]))
print("SUCCESS")
def test_dhcpv6_relay_reply_no_ifaceid_no_linkaddr(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid))
self.assert_pkt_ignored(pkt, client_pkt=False)
def test_dhcpv6_relay_reply_invalid_optlen(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptIfaceId(ifaceid=self.node_ifaceid) / \
DHCP6OptRelayMsg(optlen=32,
message=DHCP6_Reply(trid=self.test_trid))
self.assert_pkt_ignored(pkt, client_pkt=False)
def test_dhcpv6_relay_reply_unexpected_peeraddr(self):
pkt = DHCP6_RelayReply(peeraddr="fe80::abcd:f00:1337") / \
DHCP6OptIfaceId(ifaceid=self.node_ifaceid) / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid))
self.assert_pkt_ignored(pkt, client_pkt=False)
def test_dhcpv6_relay_reply_unexpected_ifaceid(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptIfaceId(ifaceid=b"ab") / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid))
self.assert_pkt_ignored(pkt, client_pkt=False)
def test_dhcpv6_simple_relay_reply_foreign_option_w_bogus_optlen(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptIfaceId(ifaceid=self.node_ifaceid) / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid)) / \
DHCP6OptClientId(optlen=32)
self.assert_pkt_ignored(pkt, client_pkt=False)
def test_dhcpv6_simple_relay_reply_options_reversed(self):
pkt = DHCP6_RelayReply(peeraddr=self.tap_lladdr) / \
DHCP6OptRelayMsg(message=DHCP6_Reply(trid=self.test_trid)) / \
DHCP6OptIfaceId(ifaceid=self.node_ifaceid)
self._test_dhcpv6_simple_relay_reply(pkt, DHCP6_Reply)