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, 14 insertions, 6 deletions

diff --git a/src/vnet/fib/fib_urpf_list.c b/src/vnet/fib/fib_urpf_list.c
index 263812ade40..b484442026a 100644
--- a/src/vnet/fib/fib_urpf_list.c
+++ b/src/vnet/fib/fib_urpf_list.c
@@ -29,16 +29,24 @@ format_fib_urpf_list (u8 *s, va_list args)
     u32 *swi;
 
     ui = va_arg(args, index_t);
-    urpf = fib_urpf_list_get(ui);
 
-    s = format(s, "uPRF-list:%d len:%d itfs:[",
-	       ui, vec_len(urpf->furpf_itfs));
+    if (INDEX_INVALID != ui)
+    {
+        urpf = fib_urpf_list_get(ui);
+
+        s = format(s, "uPRF-list:%d len:%d itfs:[",
+                   ui, vec_len(urpf->furpf_itfs));
 
-    vec_foreach(swi, urpf->furpf_itfs)
+        vec_foreach(swi, urpf->furpf_itfs)
+        {
+            s = format(s, "%d, ", *swi);
+        }
+        s = format(s, "]");
+    }
+    else
     {
-	s = format(s, "%d, ", *swi);
+        s = format(s, "uRPF-list: None");
     }
-    s = format(s, "]");
 
     return (s);
 }