geneve gtpu vxlan vxlan-gpe: VRF-aware bypass node

Bypass node MUST NOT intercept a packet if destination IP doesn’t match
a local address.  However IP address interpretation depends on the VRF,
hence bypass node must take that into account.

This patch also factors-out common VTEP management and checking code.

Type: improvement
Signed-off-by: Nick Zavaritsky <nick.zavaritsky@emnify.com>
Change-Id: I5665d94882bbf45d15f8da140c7ada528ec7fa94

1 files changed, 18 insertions, 40 deletions

diff --git a/src/vnet/vxlan-gpe/decap.c b/src/vnet/vxlan-gpe/decap.c
index dec0788c653..f2961d5ff5b 100644
--- a/src/vnet/vxlan-gpe/decap.c
+++ b/src/vnet/vxlan-gpe/decap.c
@@ -788,8 +788,10 @@ ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
   u32 *from, *to_next, n_left_from, n_left_to_next, next_index;
   vlib_node_runtime_t *error_node =
     vlib_node_get_runtime (vm, ip4_input_node.index);
-  ip4_address_t addr4;		/* last IPv4 address matching a local VTEP address */
-  ip6_address_t addr6;		/* last IPv6 address matching a local VTEP address */
+  vtep4_key_t last_vtep4;	/* last IPv4 address / fib index
+				   matching a local VTEP address */
+  vtep6_key_t last_vtep6;	/* last IPv6 address / fib index
+				   matching a local VTEP address */
 
   from = vlib_frame_vector_args (frame);
   n_left_from = frame->n_vectors;
@@ -799,9 +801,9 @@ ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
     ip4_forward_next_trace (vm, node, frame, VLIB_TX);
 
   if (is_ip4)
-    addr4.data_u32 = ~0;
+    vtep4_key_init (&last_vtep4);
   else
-    ip6_address_set_zero (&addr6);
+    vtep6_key_init (&last_vtep6);
 
   while (n_left_from > 0)
     {
@@ -883,21 +885,13 @@ ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
 	  /* Validate DIP against VTEPs */
 	  if (is_ip4)
 	    {
-	      if (addr4.as_u32 != ip40->dst_address.as_u32)
-		{
-		  if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32))
-		    goto exit0;	/* no local VTEP for VXLAN packet */
-		  addr4 = ip40->dst_address;
-		}
+	      if (!vtep4_check (&ngm->vtep_table, b0, ip40, &last_vtep4))
+		goto exit0;	/* no local VTEP for VXLAN packet */
 	    }
 	  else
 	    {
-	      if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
-		{
-		  if (!hash_get_mem (ngm->vtep6, &ip60->dst_address))
-		    goto exit0;	/* no local VTEP for VXLAN packet */
-		  addr6 = ip60->dst_address;
-		}
+	      if (!vtep6_check (&ngm->vtep_table, b0, ip60, &last_vtep6))
+		goto exit0;	/* no local VTEP for VXLAN packet */
 	    }
 
 	  flags0 = b0->flags;
@@ -969,21 +963,13 @@ ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
 	  /* Validate DIP against VTEPs */
 	  if (is_ip4)
 	    {
-	      if (addr4.as_u32 != ip41->dst_address.as_u32)
-		{
-		  if (!hash_get (ngm->vtep4, ip41->dst_address.as_u32))
-		    goto exit1;	/* no local VTEP for VXLAN packet */
-		  addr4 = ip41->dst_address;
-		}
+	      if (!vtep4_check (&ngm->vtep_table, b1, ip41, &last_vtep4))
+		goto exit1;	/* no local VTEP for VXLAN packet */
 	    }
 	  else
 	    {
-	      if (!ip6_address_is_equal (&addr6, &ip61->dst_address))
-		{
-		  if (!hash_get_mem (ngm->vtep6, &ip61->dst_address))
-		    goto exit1;	/* no local VTEP for VXLAN packet */
-		  addr6 = ip61->dst_address;
-		}
+	      if (!vtep6_check (&ngm->vtep_table, b1, ip61, &last_vtep6))
+		goto exit1;	/* no local VTEP for VXLAN packet */
 	    }
 
 	  flags1 = b1->flags;
@@ -1089,21 +1075,13 @@ ip_vxlan_gpe_bypass_inline (vlib_main_t * vm,
 	  /* Validate DIP against VTEPs */
 	  if (is_ip4)
 	    {
-	      if (addr4.as_u32 != ip40->dst_address.as_u32)
-		{
-		  if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32))
-		    goto exit;	/* no local VTEP for VXLAN packet */
-		  addr4 = ip40->dst_address;
-		}
+	      if (!vtep4_check (&ngm->vtep_table, b0, ip40, &last_vtep4))
+		goto exit;	/* no local VTEP for VXLAN packet */
 	    }
 	  else
 	    {
-	      if (!ip6_address_is_equal (&addr6, &ip60->dst_address))
-		{
-		  if (!hash_get_mem (ngm->vtep6, &ip60->dst_address))
-		    goto exit;	/* no local VTEP for VXLAN packet */
-		  addr6 = ip60->dst_address;
-		}
+	      if (!vtep6_check (&ngm->vtep_table, b0, ip60, &last_vtep6))
+		goto exit;	/* no local VTEP for VXLAN packet */
 	    }
 
 	  flags0 = b0->flags;