1 files changed, 122 insertions, 0 deletions
diff --git a/vnet/vnet/l2/l2_bvi.h b/vnet/vnet/l2/l2_bvi.h
new file mode 100644
index 00000000000..ca5673373fb
--- /dev/null
+++ b/vnet/vnet/l2/l2_bvi.h
@@ -0,0 +1,122 @@
+/*
+ * l2_bvi.h : layer 2 Bridged Virtual Interface
+ *
+ * Copyright (c) 2013 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_l2bvi_h
+#define included_l2bvi_h
+
+#include <vlib/vlib.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vppinfra/sparse_vec.h>
+
+#include <vnet/l2/l2_input.h>
+
+#define TO_BVI_ERR_OK        0
+#define TO_BVI_ERR_TAGGED    1
+#define TO_BVI_ERR_ETHERTYPE 2
+
+// Send a packet from L2 processing to L3 via the BVI interface.
+// Set next0 to the proper L3 input node.
+// Return an error if the packet isn't what we expect.
+
+static_always_inline u32 
+l2_to_bvi (vlib_main_t * vlib_main,
+           vnet_main_t * vnet_main,
+           vlib_buffer_t * b0,
+           u32 bvi_sw_if_index,
+           next_by_ethertype_t * l3_next,
+           u32 * next0)
+{
+  u8 l2_len;
+  u16 ethertype;
+  u8 * l3h;
+
+  // Save L2 header position which may be changed due to packet replication
+  vnet_buffer (b0)->ethernet.start_of_ethernet_header = b0->current_data;
+
+  // Strip L2 header
+  l2_len = vnet_buffer(b0)->l2.l2_len;
+  vlib_buffer_advance (b0, l2_len);
+
+  l3h = vlib_buffer_get_current (b0);
+  ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2));
+
+  // Set the input interface to be the BVI interface
+  vnet_buffer(b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
+  vnet_buffer(b0)->sw_if_index[VLIB_TX] = ~0;
+
+  // Go to appropriate L3 input node
+  if (ethertype == ETHERNET_TYPE_IP4) {
+    *next0 = l3_next->input_next_ip4;
+  } else if (ethertype == ETHERNET_TYPE_IP6) {
+    *next0 = l3_next->input_next_ip6;
+  } else {
+    // uncommon ethertype, check table
+    u32 i0;
+
+    i0 = sparse_vec_index (l3_next->input_next_by_type, ethertype);
+    *next0 = vec_elt (l3_next->input_next_by_type, i0);
+
+    if (i0 == SPARSE_VEC_INVALID_INDEX) {
+      return TO_BVI_ERR_ETHERTYPE;
+    } 
+  }
+
+  // increment BVI RX interface stat
+  vlib_increment_combined_counter 
+      (vnet_main->interface_main.combined_sw_if_counters
+       + VNET_INTERFACE_COUNTER_RX,
+       vlib_main->cpu_index, 
+       vnet_buffer(b0)->sw_if_index[VLIB_RX],
+       1,
+       vlib_buffer_length_in_chain (vlib_main, b0));
+  return TO_BVI_ERR_OK;
+}
+
+
+// Prepare a packet that was sent to the BVI interface for L2 processing.
+
+static_always_inline void 
+bvi_to_l2 (vlib_main_t * vlib_main,
+           vnet_main_t * vnet_main,
+           u32 cpu_index,
+           vlib_buffer_t * b0,
+           u32 bvi_sw_if_index)
+{
+  // Set the input interface to be the BVI interface
+  vnet_buffer(b0)->sw_if_index[VLIB_RX] = bvi_sw_if_index;
+  vnet_buffer(b0)->sw_if_index[VLIB_TX] = ~0;
+
+  // Update l2_len in packet which is expected by l2 path, 
+  // including l2 tag push/pop code on output
+  vnet_update_l2_len(b0);
+
+  // increment BVI TX interface stat
+  vlib_increment_combined_counter 
+      (vnet_main->interface_main.combined_sw_if_counters
+       + VNET_INTERFACE_COUNTER_TX,
+       cpu_index,
+       bvi_sw_if_index,
+       1,
+       vlib_buffer_length_in_chain (vlib_main, b0));
+}
+
+
+void
+l2bvi_register_input_type (vlib_main_t * vm,
+                           ethernet_type_t type,
+                           u32 node_index);
+#endif