Plugin for IP-Address to Interface Punting

This plugin provides per-ip address to interface punting.

When at least one rule is defined, the plugin receives all packets
which destination is one of VPP's address but which was not processed
by VPP (e.g., a TCP packet on a port that is not open, or a packet
for a protocol which is not attached).

Based on the set of configured rules, the destination address of each
packet is used to send the packet on the associated interface.

This plugin allows multiple containers to use
VPP's TCP stack (or other features provided by VPP) while still
being able to receive additional packets.

Change-Id: I3e69bb7d98183bf5163cb9ecb564cb482de252ce
Signed-off-by: Pierre Pfister <ppfister@cisco.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/src/plugins/stn/stn.h b/src/plugins/stn/stn.h
new file mode 100644
index 00000000000..a6f0a0a5998
--- /dev/null
+++ b/src/plugins/stn/stn.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2017 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 SRC_PLUGINS_STN_STN_H_
+#define SRC_PLUGINS_STN_STN_H_
+
+#include <vlib/vlib.h>
+#include <vnet/ip/ip4.h>
+#include <vnet/ip/ip6.h>
+#include <vppinfra/bihash_16_8.h>
+
+typedef struct {
+  ip46_address_t address;
+  u32 next_node_index;
+  u32 sw_if_index;
+} stn_rule_t;
+
+typedef struct {
+  /* pool of stn rules */
+  stn_rule_t *rules;
+
+  /* number of rules */
+  u32 n_rules;
+
+  /* hash table used to retrieve the rule from the ip address */
+  clib_bihash_16_8_t rule_by_address_table;
+
+  u32 punt_to_stn_ip4_next_index;
+  u32 punt_to_stn_ip6_next_index;
+
+  u16 msg_id_base;
+} stn_main_t;
+
+typedef struct {
+  /** Destination address of intercepted packets */
+  ip46_address_t address;
+  /** TX interface to send packets to */
+  u32 sw_if_index;
+  /** Whether to delete the rule */
+  u8 del;
+} stn_rule_add_del_args_t;
+
+/**
+ * Add or delete an stn rule.
+ */
+int stn_rule_add_del (stn_rule_add_del_args_t *args);
+
+extern stn_main_t stn_main;
+
+clib_error_t *
+stn_api_init (vlib_main_t * vm, stn_main_t * sm);
+
+#endif /* SRC_PLUGINS_STN_STN_H_ */