ipsec: drop runts in esp-decrypt

[vpp.git] / src / vnet / ipsec / esp_decrypt.c

diff --git a/src/vnet/ipsec/esp_decrypt.c b/src/vnet/ipsec/esp_decrypt.c
index 5d1f206..dfc86d4 100644 (file)
--- a/src/vnet/ipsec/esp_decrypt.c
+++ b/src/vnet/ipsec/esp_decrypt.c
@@ -44,6 +44,7 @@ typedef enum
  _(INTEG_ERROR, "Integrity check failed")                       \
  _(CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \
  _(REPLAY, "SA replayed packet")                                \
+ _(RUNT, "undersized packet")                                   \
  _(CHAINED_BUFFER, "chained buffers (packet dropped)")          \
  _(OVERSIZED_HEADER, "buffer with oversized header (dropped)")  \
  _(NO_TAIL_SPACE, "no enough buffer tail space (dropped)")
@@ -193,6 +194,13 @@ esp_decrypt_inline (vlib_main_t * vm,
          goto next;
        }
 
+      if (pd->current_length < cpd.icv_sz + esp_sz + cpd.iv_sz)
+       {
+         b[0]->error = node->errors[ESP_DECRYPT_ERROR_RUNT];
+         next[0] = ESP_DECRYPT_NEXT_DROP;
+         goto next;
+       }
+
       len = pd->current_length - cpd.icv_sz;
       current_sa_pkts += 1;
       current_sa_bytes += pd->current_length;