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-rw-r--r--src/vnet/buffer.h14
1 files changed, 12 insertions, 2 deletions
diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index aed72c5031a..59a8256b902 100644
--- 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.