SRv6 dynamic proxy plugin

Change-Id: Ie460005510b8a70d00de31b6651e762cc3a63229
Signed-off-by: Francois Clad <fclad@cisco.com>

MAINTAINERS

@@ -159,6 +159,11 @@ M:  Hongjun Ni <hongjun.ni@intel.com>
 F:  src/plugins/pppoe/
 F:  src/plugins/pppoe.am
 
+Plugin - IPv6 Segment Routing Dynamic Proxy
+M:	Francois Clad <fclad@cisco.com>
+F:	src/plugins/srv6-ad/
+F:	src/plugins/srv6_ad.am
+
 Plugin - IPv6 Segment Routing Masquerading Proxy
 M:	Francois Clad <fclad@cisco.com>
 F:	src/plugins/srv6-am/

src/configure.ac

@@ -221,6 +221,7 @@ PLUGIN_ENABLED(marvell)
 PLUGIN_ENABLED(memif)
 PLUGIN_ENABLED(pppoe)
 PLUGIN_ENABLED(sixrd)
+PLUGIN_ENABLED(srv6ad)
 PLUGIN_ENABLED(srv6am)
 PLUGIN_ENABLED(srv6as)
 PLUGIN_ENABLED(nat)

src/plugins/Makefile.am

@@ -83,6 +83,10 @@ if ENABLE_SIXRD_PLUGIN
 include sixrd.am
 endif
 
+if ENABLE_SRV6AD_PLUGIN
+include srv6_ad.am
+endif
+
 if ENABLE_SRV6AM_PLUGIN
 include srv6_am.am
 endif

src/plugins/srv6-ad/ad.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2015 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_srv6_ad_h__
+#define __included_srv6_ad_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/srv6/sr.h>
+#include <vnet/srv6/sr_packet.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+#define DA_IP4 4
+#define DA_IP6 6
+
+typedef struct
+{
+  u16 msg_id_base;			  /**< API message ID base */
+
+  vlib_main_t *vlib_main;		  /**< [convenience] vlib main */
+  vnet_main_t *vnet_main;		  /**< [convenience] vnet main */
+
+  dpo_type_t srv6_ad_dpo_type;		  /**< DPO type */
+
+  u32 srv6_localsid_behavior_id;	  /**< SRv6 LocalSID behavior number */
+
+  u32 *sw_iface_localsid4;		  /**< Retrieve local SID from iface */
+  u32 *sw_iface_localsid6;		  /**< Retrieve local SID from iface */
+} srv6_ad_main_t;
+
+/*
+ * This is the memory that will be stored per each localsid
+ * the user instantiates
+ */
+typedef struct
+{
+  ip46_address_t nh_addr;			  /**< Proxied device address */
+  u32 sw_if_index_out;						    /**< Outgoing iface to proxied dev. */
+  u32 nh_adj;									/**< Adjacency index for out. iface */
+  u8 ip_version;
+
+  u32 sw_if_index_in;						    /**< Incoming iface from proxied dev. */
+  u8 *rewrite;								/**< Headers to be rewritten */
+} srv6_ad_localsid_t;
+
+srv6_ad_main_t srv6_ad_main;
+
+format_function_t format_srv6_ad_localsid;
+unformat_function_t unformat_srv6_ad_localsid;
+
+void srv6_ad_dpo_lock (dpo_id_t * dpo);
+void srv6_ad_dpo_unlock (dpo_id_t * dpo);
+
+extern vlib_node_registration_t srv6_ad_localsid_node;
+
+#endif /* __included_srv6_ad_h__ */
+
+/*
+* fd.io coding-style-patch-verification: ON
+*
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*/

src/plugins/srv6-ad/ad_plugin_doc.md

@@ -0,0 +1,23 @@
+# SRv6 endpoint to SR-unaware appliance via dynamic proxy (End.AD) {#srv6_ad_plugin_doc}
+
+## Overview
+
+The "Endpoint to SR-unaware appliance via dynamic proxy" (End.AD) is a two-parts
+proxy function for processing SRv6 encapsulated traffic on behalf of an
+SR-unaware appliance. The first part decapsulates the incoming traffic and sends
+it towards an appliance on a specific interface, while the second
+re-encapsulates the traffic coming back from the appliance.
+
+In this scenario, there are no restrictions on the operations that can be
+performed by the appliance on the stream of packets. It may operate at all
+protocol layers, terminate transport layer connections, generate new packets and
+initiate transport layer connections. This function may also be used to
+integrate an IPv4-only appliance into an SRv6 policy.
+
+The End.AD function relies on a local caching mechanism to learn and
+re-encapsulate the traffic with the same headers that were removed. 
+This cache is used to store the IPv6 header and its
+extension headers while the appliance processes the inner packet. In the
+following, we refer to an entry in this cache as C(type,iface), where type is
+either IPv4 or IPv6 and iface is the receiving interface on the SRv6 proxy
+(IFACE-IN).

src/plugins/srv6_ad.am

@@ -0,0 +1,22 @@
+# Copyright (c) 2016 Cisco Systems, Inc.
+# 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.
+
+vppplugins_LTLIBRARIES += srv6ad_plugin.la
+
+srv6ad_plugin_la_SOURCES =			\
+	srv6-ad/ad.c	\
+	srv6-ad/node.c
+
+noinst_HEADERS += srv6-ad/ad.h
+
+# vi:syntax=automake