IP Multicast FIB (mfib)

 - IPv[46] mfib tables with support for (*,G/m), (*,G) and (S,G) exact and longest prefix match
 - Replication represented via a new replicate DPO.
 - RPF configuration and data-plane checking
 - data-plane signals sent to listening control planes.

The functions of multicast forwarding entries differ from their unicast conterparts, so we introduce a new mfib_table_t and mfib_entry_t objects. However, we re-use the fib_path_list to resolve and build the entry's output list. the fib_path_list provides the service to construct a replicate DPO for multicast.

'make tests' is added to with two new suites; TEST=mfib, this is invocation of the CLI command 'test mfib' which deals with many path add/remove, flag set/unset scenarios, TEST=ip-mcast, data-plane forwarding tests.

Updated applications to use the new MIFB functions;
  - IPv6 NS/RA.
  - DHCPv6
 unit tests for these are undated accordingly.

Change-Id: I49ec37b01f1b170335a5697541c8fd30e6d3a961
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/vnet/mfib/mfib_signal.h b/src/vnet/mfib/mfib_signal.h
new file mode 100644
index 00000000000..732d8aff3e9
--- /dev/null
+++ b/src/vnet/mfib/mfib_signal.h
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+
+#ifndef __MFIB_SIGNAL_H__
+#define __MFIB_SIGNAL_H__
+
+#include <vlib/vlib.h>
+#include <vnet/mfib/mfib_types.h>
+#include <vnet/mfib/mfib_itf.h>
+#include <vnet/mfib/mfib_entry.h>
+
+#define MFIB_SIGNAL_BUFFER_SIZE 255
+
+/**
+ * A pair of indicies, for the entry and interface resp.
+ */
+typedef struct mfib_signal_t_
+{
+    fib_node_index_t mfs_entry;
+    index_t mfs_itf;
+
+    /**
+     * @brief A buffer copied from the DP plane that triggered the signal
+     */
+    u8 mfs_buffer[MFIB_SIGNAL_BUFFER_SIZE];
+
+    u8 mfs_buffer_len;
+} mfib_signal_t;
+
+
+extern void mfib_signal_push(const mfib_entry_t *mfe,
+                             mfib_itf_t *mfi,
+                             vlib_buffer_t *b0);
+extern void mfib_signal_remove_itf(const mfib_itf_t *mfi);
+
+extern void mfib_signal_module_init(void);
+
+struct _unix_shared_memory_queue;
+
+extern void vl_mfib_signal_send_one(struct _unix_shared_memory_queue *q,
+                                    u32 context,
+                                    const mfib_signal_t *mfs);
+extern int mfib_signal_send_one(struct _unix_shared_memory_queue *q,
+                                u32 context);
+
+#endif
+