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, 27 insertions, 0 deletions

diff --git a/src/vnet/ip/ip6.h b/src/vnet/ip/ip6.h
index f493db017ec..6fecd42dc61 100644
--- a/src/vnet/ip/ip6.h
+++ b/src/vnet/ip/ip6.h
@@ -49,6 +49,7 @@
 #include <stdbool.h>
 #include <vppinfra/bihash_24_8.h>
 #include <vppinfra/bihash_template.h>
+#include <vnet/util/radix.h>
 
 /*
  * Default size of the ip6 fib hash table
@@ -75,6 +76,21 @@ typedef struct
   flow_hash_config_t flow_hash_config;
 } ip6_fib_t;
 
+typedef struct ip6_mfib_t
+{
+  /* Table ID (hash key) for this FIB. */
+  u32 table_id;
+
+  /* Index into FIB vector. */
+  u32 index;
+
+  /*
+   *  Pointer to the top of a radix tree.
+   * This cannot be realloc'd, hence it cannot be inlined with this table
+   */
+  struct radix_node_head *rhead;
+} ip6_mfib_t;
+
 struct ip6_main_t;
 
 typedef void (ip6_add_del_interface_address_function_t)
@@ -137,12 +153,18 @@ typedef struct ip6_main_t
   /* Pool of FIBs. */
   struct fib_table_t_ *fibs;
 
+  /** Vector of MFIBs. */
+  struct mfib_table_t_ *mfibs;
+
   /* Network byte orders subnet mask for each prefix length */
   ip6_address_t fib_masks[129];
 
   /* Table index indexed by software interface. */
   u32 *fib_index_by_sw_if_index;
 
+  /** Table index indexed by software interface. */
+  u32 *mfib_index_by_sw_if_index;
+
   /* IP6 enabled count by software interface */
   u8 *ip_enabled_by_sw_if_index;
 
@@ -150,6 +172,10 @@ typedef struct ip6_main_t
      ID space is not necessarily dense; index space is dense. */
   uword *fib_index_by_table_id;
 
+  /** Hash table mapping table id to multicast fib index.
+     ID space is not necessarily dense; index space is dense. */
+  uword *mfib_index_by_table_id;
+
   /* Hash table mapping interface rewrite adjacency index by sw if index. */
   uword *interface_route_adj_index_by_sw_if_index;
 
@@ -185,6 +211,7 @@ extern ip6_main_t ip6_main;
 /* Global ip6 input node.  Errors get attached to ip6 input node. */
 extern vlib_node_registration_t ip6_input_node;
 extern vlib_node_registration_t ip6_rewrite_node;
+extern vlib_node_registration_t ip6_rewrite_mcast_node;
 extern vlib_node_registration_t ip6_rewrite_local_node;
 extern vlib_node_registration_t ip6_discover_neighbor_node;
 extern vlib_node_registration_t ip6_glean_node;