session: ignore zero length dgrams

[vpp.git] / src / vnet / session / session_node.c

diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 7a63071..c67d63f 100644 (file)
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -1226,6 +1226,13 @@ session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
 
          svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr),
                         (u8 *) & ctx->hdr);
+         /* Zero length dgrams not supported */
+         if (PREDICT_FALSE (ctx->hdr.data_length == 0))
+           {
+             svm_fifo_dequeue_drop (ctx->s->tx_fifo, sizeof (ctx->hdr));
+             ctx->max_len_to_snd = 0;
+             return;
+           }
          ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset);
          len = ctx->hdr.data_length - ctx->hdr.data_offset;
 
@@ -1253,12 +1260,13 @@ session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
                {
                  svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr),
                                 (u8 *) & hdr);
-                 ASSERT (hdr.data_length > hdr.data_offset);
                  dgram_len = hdr.data_length - hdr.data_offset;
                  if (offset + sizeof (hdr) + hdr.data_length >
                        ctx->max_dequeue ||
                      first_dgram_len != dgram_len)
                    break;
+                 /* Assert here to allow test above with zero length dgrams */
+                 ASSERT (hdr.data_length > hdr.data_offset);
                  len += dgram_len;
                  offset += sizeof (hdr) + hdr.data_length;
                }