MPLS Mcast

 1 - interface-DPO
        Used in the Data-plane to change a packet's input interface
 2 - MPLS multicast FIB entry
        Same as a unicast entry but it links to a replicate not a load-balance DPO
 3 - Multicast MPLS tunnel
        Update MPLS tunnels to use a FIB path-list to describe the endpoint[s]. Use the path-list to generate the forwarding chain (DPOs) to link to .
 4 - Resolve a path via a local label (of an mLDP LSP)
        For IP multicast entries to use an LSP in the replication list, we need to decribe the 'resolve-via-label' where the label is that of a multicast LSP.
 5 - MPLS disposition path sets RPF-ID
        For a interface-less LSP (i.e. mLDP not RSVP-TE) at the tail of the LSP we still need to perform an RPF check. An MPLS disposition DPO performs the MPLS pop validation checks and sets the RPF-ID in the packet.
 6 - RPF check with per-entry RPF-ID
       An RPF-ID is used instead of a real interface SW if index in the case the IP traffic arrives from an LSP that does not have an associated interface.

Change-Id: Ib92e177be919147bafeb599729abf3d1abc2f4b3
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/src/vnet/dpo/interface_dpo.h b/src/vnet/dpo/interface_dpo.h
new file mode 100644
index 00000000000..1538dfbbf06
--- /dev/null
+++ b/src/vnet/dpo/interface_dpo.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+/**
+ * @brief
+ * The data-path object representing interfaceing the packet, i.e. it's for-us
+ */
+
+#ifndef __INTERFACE_DPO_H__
+#define __INTERFACE_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+typedef struct interface_dpo_t_
+{
+    /**
+     * The Software interface index that the packets will be given
+     * as the ingress/rx interface
+     */
+    u32 ido_sw_if_index;
+
+    /**
+     * next VLIB node. A '<proto>-input' node.
+     */
+    u32 ido_next_node;
+
+    /**
+     * DPO protocol that the packets will have as they 'ingress'
+     * on this interface
+     */
+    dpo_proto_t ido_proto;
+
+    /**
+     * number of locks.
+     */
+    u16 ido_locks;
+} interface_dpo_t;
+
+extern void interface_dpo_add_or_lock (dpo_proto_t proto,
+                                       u32 sw_if_index,
+                                       dpo_id_t *dpo);
+
+extern void interface_dpo_module_init(void);
+
+/**
+ * @brief pool of all interface DPOs
+ */
+interface_dpo_t *interface_dpo_pool;
+
+static inline interface_dpo_t *
+interface_dpo_get (index_t index)
+{
+    return (pool_elt_at_index(interface_dpo_pool, index));
+}
+
+#endif