ipsec: Changes to make ipsec encoder/decoders reusable by the plugins

[vpp.git] / src / vnet / buffer.h

diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index aed72c5..59a8256 100644 (file)
--- a/src/vnet/buffer.h
+++ b/src/vnet/buffer.h
@@ -168,7 +168,7 @@ typedef struct
          };
 
          /* Rewrite length */
-         u32 save_rewrite_length;
+         u8 save_rewrite_length;
 
          /* MFIB RPF ID */
          u32 rpf_id;
@@ -250,7 +250,7 @@ typedef struct
       u8 pyld_proto:3;         /* dpo_proto_t */
       u8 rsvd:5;
       /* Rewrite length */
-      u32 save_rewrite_length;
+      u8 save_rewrite_length;
       /* Save the mpls header length including all label stack */
       u8 mpls_hdr_length;
       /*
@@ -380,6 +380,16 @@ typedef struct
   };
 } vnet_buffer_opaque_t;
 
+#define VNET_REWRITE_TOTAL_BYTES (VLIB_BUFFER_PRE_DATA_SIZE)
+
+STATIC_ASSERT (STRUCT_SIZE_OF (vnet_buffer_opaque_t, ip.save_rewrite_length)
+              == STRUCT_SIZE_OF (vnet_buffer_opaque_t,
+                                 mpls.save_rewrite_length)
+              && STRUCT_SIZE_OF (vnet_buffer_opaque_t,
+                                 mpls.save_rewrite_length) == 1
+              && VNET_REWRITE_TOTAL_BYTES < UINT8_MAX,
+              "save_rewrite_length member must be able to hold the max value of rewrite length");
+
 /*
  * The opaque field of the vlib_buffer_t is interpreted as a
  * vnet_buffer_opaque_t. Hence it should be big enough to accommodate one.