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

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>

1 files changed, 17 insertions, 6 deletions

diff --git a/src/vnet/ethernet/node.c b/src/vnet/ethernet/node.c
index 6d57da31..b699e381 100755
--- a/src/vnet/ethernet/node.c
+++ b/src/vnet/ethernet/node.c
@@ -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);