pvti: Packet Vector Tunnel Interface

This plugin implements a PoC of UDP-based tunnel substrate whose aim is
to specifically provide higher MTU to the upper layers by chunking
the payload PDUs into smaller packets with full 5-tuple.

At the same time, if there are multiple small packets to
the same destination during the vector processing, they
are packed into "carrier" packets up to underlay MTU size.

It does assume a trustworthy underlying medium, thus for the
operation over Internet it requires the use of encryption layer
underneath.

Type: feature
Change-Id: I323958fa8de62584f6ed15643ea689568a9a62bc
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/src/plugins/pvti/input.h b/src/plugins/pvti/input.h
new file mode 100644
index 00000000000..02a186cde05
--- /dev/null
+++ b/src/plugins/pvti/input.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2024 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_pvti_input_h__
+#define __included_pvti_input_h__
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+#include <vppinfra/error.h>
+#include <pvti/pvti.h>
+#include <pvti/pvti_if.h>
+
+typedef struct
+{
+  u16 total_chunk_length;
+} pvti_input_chunk_t;
+
+#define MAX_CHUNKS	   32
+#define PVTI_RX_MAX_LENGTH 2048
+
+typedef struct
+{
+  u32 next_index;
+  u32 sw_if_index;
+  ip_address_t remote_ip;
+  u16 remote_port;
+  u16 local_port;
+  u32 seq;
+  pvti_input_chunk_t chunks[MAX_CHUNKS];
+  u8 chunk_count;
+  u8 trace_type;
+  u8 packet_data[64];
+} pvti_input_trace_t;
+
+#define foreach_pvti_input_trace_type                                         \
+  _ (drop, "drop")                                                            \
+  _ (decap, "decapsulate")                                                    \
+  _ (free, "free")                                                            \
+  _ (enqueue, "enqueue")
+
+typedef enum
+{
+#define _(f, s) PVTI_INPUT_TRACE_##f,
+  foreach_pvti_input_trace_type
+#undef _
+    PVTI_INPUT_TRACE_N_TYPES,
+} pvti_input_trace_type_t;
+
+#define foreach_pvti_input_error                                              \
+  _ (PROCESSED, "PVTI tunneled packets processed")                            \
+  _ (DECAPSULATED, "PVTI inner packets decapsulated")                         \
+  _ (PEER, "Could not find a peer")                                           \
+  _ (NOCHUNKS, "Packet has no chunks")                                        \
+  _ (NO_BUFFERS, "No buffers available to decapsulate")                       \
+  _ (TOOMANYREASS, "Packet has more reassembly chunks than total")            \
+  _ (PACKET_TOO_SHORT, "Packet too short")
+
+typedef enum
+{
+#define _(sym, str) PVTI_INPUT_ERROR_##sym,
+  foreach_pvti_input_error
+#undef _
+    PVTI_INPUT_N_ERROR,
+} pvti_input_error_t;
+
+typedef enum
+{
+  PVTI_INPUT_NEXT_DROP,
+  PVTI_INPUT_NEXT_IP4_INPUT,
+  PVTI_INPUT_NEXT_IP6_INPUT,
+  PVTI_INPUT_NEXT_PUNT,
+  PVTI_INPUT_N_NEXT,
+} pvti_input_next_t;
+
+#endif // pvti_input_h