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Add MAC address check in ethernet-input node if interface in L3 mode

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Interface can be in promiscuous mode if more than one of its sub-
interface is in L2 mode. In promiscuous mode, L3 interface need to
verify DMAC of packet to match that of the interface and drop if not.
This check was done on sub-interface only and now also added to main
interface path.

Fix incorrect MAC addresses in the flow-per-pkt plugin test, which
caused it to fail.

Fix MAC address usage in BFD tests.

Change-Id: I12a17ec05c7ab298ad10d400c90d082c97eca521
Signed-off-by: John Lo <loj@cisco.com>
Signed-off-by: Klement Sekera <ksekera@cisco.com>
This commit is contained in:
John Lo
2017-03-10 17:15:22 -05:00
committed by Dave Barach
parent 59dda065bb
commit 1904c47d5f
3 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/vnet/ethernet/node.c
View File

@ -294,6 +294,7 @@ ethernet_input_inline (vlib_main_t * vm,
u32 cpu_index = os_get_cpu_number ();
u32 cached_sw_if_index = ~0;
u32 cached_is_l2 = 0; /* shut up gcc */
vnet_hw_interface_t *hi = NULL; /* used for main interface only */
if (variant != ETHERNET_INPUT_VARIANT_ETHERNET)
error_node = vlib_node_get_runtime (vm, ethernet_input_node.index);
@ -386,11 +387,12 @@ ethernet_input_inline (vlib_main_t * vm,
if (PREDICT_FALSE (sw_if_index0 != sw_if_index1))
goto slowpath;
/* Now sw_if_index0 == sw_if_index1 */
if (PREDICT_FALSE (cached_sw_if_index != sw_if_index0))
{
cached_sw_if_index = sw_if_index0;
hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
intf0 = vec_elt_at_index (em->main_intfs, hi0->hw_if_index);
hi = vnet_get_sup_hw_interface (vnm, sw_if_index0);
intf0 = vec_elt_at_index (em->main_intfs, hi->hw_if_index);
subint0 = &intf0->untagged_subint;
cached_is_l2 = is_l20 = subint0->flags & SUBINT_CONFIG_L2;
}
@ -409,6 +411,12 @@ ethernet_input_inline (vlib_main_t * vm,
}
else
{
if (!ethernet_address_cast (e0->dst_address) &&
!eth_mac_equal ((u8 *) e0, hi->hw_address))
error0 = ETHERNET_ERROR_L3_MAC_MISMATCH;
if (!ethernet_address_cast (e1->dst_address) &&
!eth_mac_equal ((u8 *) e1, hi->hw_address))
error1 = ETHERNET_ERROR_L3_MAC_MISMATCH;
determine_next_node (em, variant, 0, type0, b0,
&error0, &next0);
vlib_buffer_advance (b0, sizeof (ethernet_header_t));
@ -540,10 +548,10 @@ ethernet_input_inline (vlib_main_t * vm,
determine_next_node (em, variant, is_l21, type1, b1, &error1,
&next1);
ship_it01:
b0->error = error_node->errors[error0];
b1->error = error_node->errors[error1];
ship_it01:
// verify speculative enqueue
vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
n_left_to_next, bi0, bi1, next0,
@ -603,8 +611,8 @@ ethernet_input_inline (vlib_main_t * vm,
if (PREDICT_FALSE (cached_sw_if_index != sw_if_index0))
{
cached_sw_if_index = sw_if_index0;
hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0);
intf0 = vec_elt_at_index (em->main_intfs, hi0->hw_if_index);
hi = vnet_get_sup_hw_interface (vnm, sw_if_index0);
intf0 = vec_elt_at_index (em->main_intfs, hi->hw_if_index);
subint0 = &intf0->untagged_subint;
cached_is_l2 = is_l20 = subint0->flags & SUBINT_CONFIG_L2;
}
@ -619,6 +627,9 @@ ethernet_input_inline (vlib_main_t * vm,
}
else
{
if (!ethernet_address_cast (e0->dst_address) &&
!eth_mac_equal ((u8 *) e0, hi->hw_address))
error0 = ETHERNET_ERROR_L3_MAC_MISMATCH;
determine_next_node (em, variant, 0, type0, b0,
&error0, &next0);
vlib_buffer_advance (b0, sizeof (ethernet_header_t));
@ -705,10 +716,10 @@ ethernet_input_inline (vlib_main_t * vm,
determine_next_node (em, variant, is_l20, type0, b0, &error0,
&next0);
ship_it0:
b0->error = error_node->errors[error0];
// verify speculative enqueue
ship_it0:
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);

11
test/test_bfd.py
View File

@ -1090,6 +1090,9 @@ class BFD4TestCase(VppTestCase):
self.assertNotEqual(p[IP].src, self.loopback0.local_ip4,
"BFD ECHO src IP equal to loopback IP")
self.logger.debug(ppp("Looping back packet:", p))
self.assert_equal(p[Ether].dst, self.pg0.remote_mac,
"ECHO packet destination MAC address")
p[Ether].dst = self.pg0.local_mac
self.pg0.add_stream(p)
self.pg_start()
elif p.haslayer(BFD):
@ -1159,6 +1162,7 @@ class BFD4TestCase(VppTestCase):
self.logger.debug(ppp("Got packet:", p))
if p[UDP].dport == BFD.udp_dport_echo:
self.logger.debug(ppp("Looping back packet:", p))
p[Ether].dst = self.pg0.local_mac
self.pg0.add_stream(p)
self.pg_start()
break
@ -1190,6 +1194,7 @@ class BFD4TestCase(VppTestCase):
self.logger.debug(ppp("Got packet:", p))
if p[UDP].dport == BFD.udp_dport_echo:
self.logger.debug(ppp("Looping back packet:", p))
p[Ether].dst = self.pg0.local_mac
self.pg0.add_stream(p)
self.pg_start()
break
@ -1230,6 +1235,7 @@ class BFD4TestCase(VppTestCase):
else:
self.logger.debug(ppp("Got followup echo packet:", p))
self.logger.debug(ppp("Looping back first echo packet:", p))
echo_packet[Ether].dst = self.pg0.local_mac
self.pg0.add_stream(echo_packet)
self.pg_start()
elif p.haslayer(BFD):
@ -1278,6 +1284,7 @@ class BFD4TestCase(VppTestCase):
timeout_at = time.time() + self.vpp_session.detect_mult * \
self.test_session.required_min_echo_rx / USEC_IN_SEC
p[BFD_vpp_echo].checksum = getrandbits(64)
p[Ether].dst = self.pg0.local_mac
self.logger.debug(ppp("Looping back modified echo packet:", p))
self.pg0.add_stream(p)
self.pg_start()
@ -1523,7 +1530,6 @@ class BFD6TestCase(VppTestCase):
self.assert_equal(udp_sport_tx, udp_sport_rx, "UDP source port (== "
"ECHO packet identifier for test purposes)")
@unittest.skipUnless(running_extended_tests(), "part of extended tests")
def test_echo(self):
""" echo function used """
bfd_session_up(self)
@ -1554,6 +1560,9 @@ class BFD6TestCase(VppTestCase):
self.assertNotEqual(p[IPv6].src, self.loopback0.local_ip6,
"BFD ECHO src IP equal to loopback IP")
self.logger.debug(ppp("Looping back packet:", p))
self.assert_equal(p[Ether].dst, self.pg0.remote_mac,
"ECHO packet destination MAC address")
p[Ether].dst = self.pg0.local_mac
self.pg0.add_stream(p)
self.pg_start()
elif p.haslayer(BFD):

2
test/test_flowperpkt.py
View File

@ -43,7 +43,7 @@ class TestFlowperpkt(VppTestCase):
for size in packet_sizes:
info = self.create_packet_info(src_if, dst_if)
payload = self.info_to_payload(info)
p = (Ether(src=src_if.local_mac, dst=dst_if.remote_mac) /
p = (Ether(src=src_if.remote_mac, dst=src_if.local_mac) /
IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4) /
UDP(sport=1234, dport=4321) /
Raw(payload))