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, 20 insertions, 0 deletions

diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index fdfe7f63dfc..9fdf9b3cee1 100644
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -2752,6 +2752,16 @@ ip4_rewrite_mcast (vlib_main_t * vm,
     return ip4_rewrite_inline (vm, node, frame, 0, 0, 1);
 }
 
+static uword
+ip4_mcast_midchain (vlib_main_t * vm,
+		    vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  if (adj_are_counters_enabled ())
+    return ip4_rewrite_inline (vm, node, frame, 1, 1, 1);
+  else
+    return ip4_rewrite_inline (vm, node, frame, 0, 1, 1);
+}
+
 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (ip4_rewrite_node) = {
   .function = ip4_rewrite,
@@ -2778,6 +2788,16 @@ VLIB_REGISTER_NODE (ip4_rewrite_mcast_node) = {
 };
 VLIB_NODE_FUNCTION_MULTIARCH (ip4_rewrite_mcast_node, ip4_rewrite_mcast)
 
+VLIB_REGISTER_NODE (ip4_mcast_midchain_node, static) = {
+  .function = ip4_mcast_midchain,
+  .name = "ip4-mcast-midchain",
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_ip4_rewrite_trace,
+  .sibling_of = "ip4-rewrite",
+};
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_mcast_midchain_node, ip4_mcast_midchain)
+
 VLIB_REGISTER_NODE (ip4_midchain_node) = {
   .function = ip4_midchain,
   .name = "ip4-midchain",