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-rw-r--r--src/vnet/dpo/mpls_label_dpo.c12
-rw-r--r--src/vnet/dpo/mpls_label_dpo.h8
2 files changed, 19 insertions, 1 deletions
diff --git a/src/vnet/dpo/mpls_label_dpo.c b/src/vnet/dpo/mpls_label_dpo.c
index c6e8dcc475c..fa5177ab9ea 100644
--- a/src/vnet/dpo/mpls_label_dpo.c
+++ b/src/vnet/dpo/mpls_label_dpo.c
@@ -16,6 +16,7 @@
#include <vnet/ip/ip.h>
#include <vnet/dpo/mpls_label_dpo.h>
#include <vnet/mpls/mpls.h>
+#include <vnet/dpo/drop_dpo.h>
/*
* pool of all MPLS Label DPOs
@@ -53,6 +54,17 @@ mpls_label_dpo_create (mpls_label_t *label_stack,
u32 ii;
mld = mpls_label_dpo_alloc();
+
+ if (MPLS_LABEL_DPO_MAX_N_LABELS < vec_len(label_stack))
+ {
+ clib_warning("Label stack size exceeded");
+ dpo_stack(DPO_MPLS_LABEL,
+ mld->mld_payload_proto,
+ &mld->mld_dpo,
+ drop_dpo_get(DPO_PROTO_MPLS));
+ return (mpls_label_dpo_get_index(mld));
+ }
+
mld->mld_n_labels = vec_len(label_stack);
mld->mld_n_hdr_bytes = mld->mld_n_labels * sizeof(mld->mld_hdr[0]);
mld->mld_payload_proto = payload_proto;
diff --git a/src/vnet/dpo/mpls_label_dpo.h b/src/vnet/dpo/mpls_label_dpo.h
index e23f3d262ff..8494d26b495 100644
--- a/src/vnet/dpo/mpls_label_dpo.h
+++ b/src/vnet/dpo/mpls_label_dpo.h
@@ -20,6 +20,11 @@
#include <vnet/mpls/packet.h>
#include <vnet/dpo/dpo.h>
+
+/**
+ * Maximum number of labels in one DPO
+ */
+#define MPLS_LABEL_DPO_MAX_N_LABELS 12
/**
* A representation of an MPLS label for imposition in the data-path
*/
@@ -27,8 +32,9 @@ typedef struct mpls_label_dpo_t
{
/**
* The MPLS label header to impose. Outer most label first.
+ * Each DPO will occupy one cache line, stuff that many labels in.
*/
- mpls_unicast_header_t mld_hdr[8];
+ mpls_unicast_header_t mld_hdr[MPLS_LABEL_DPO_MAX_N_LABELS];
/**
* Next DPO in the graph