fib: Always install all routers mcast addresses

Type: improvement

Signed-off-by: Neale Ranns <nranns@cisco.com>
Change-Id: Ia8dff15855a81cf29729bdaa3ff28fbe3254fa97

3 files changed, 89 insertions, 29 deletions

diff --git a/src/vnet/mfib/ip4_mfib.c b/src/vnet/mfib/ip4_mfib.c
index 4da1be61113..6973380ec06 100644
--- a/src/vnet/mfib/ip4_mfib.c
+++ b/src/vnet/mfib/ip4_mfib.c
@@ -18,16 +18,27 @@
 #include <vnet/mfib/mfib_table.h>
 #include <vnet/mfib/mfib_entry.h>
 
-static const mfib_prefix_t ip4_specials[] = {
+static const mfib_prefix_t all_zeros =
+{
+    .fp_proto = FIB_PROTOCOL_IP4,
+};
+static const mfib_prefix_t ip4_specials[] =
+{
+    /* ALL prefixes are in network order */
     {
-        /* (*,*)/0 */
-        .fp_src_addr = {
-            .ip4.data_u32 = 0,
+        /* (*,224.0.0.1)/32 - all hosts */
+        .fp_grp_addr = {
+            .ip4.data_u32 = 0x010000e0,
         },
+        .fp_len = 32,
+        .fp_proto = FIB_PROTOCOL_IP4,
+    },
+    {
+        /* (*,224.0.0.2)/32 - all routers */
         .fp_grp_addr = {
-            .ip4.data_u32 = 0,
+            .ip4.data_u32 = 0x020000e0,
         },
-        .fp_len  = 0,
+        .fp_len = 32,
         .fp_proto = FIB_PROTOCOL_IP4,
     },
 };
@@ -57,24 +68,31 @@ ip4_create_mfib_with_table_id (u32 table_id,
     mfib_table_lock(mfib_table->mft_index, FIB_PROTOCOL_IP4, src);
 
     /*
-     * add the special entries into the new FIB
+     * add the default route into the new FIB
      */
+    mfib_table_entry_update(mfib_table->mft_index,
+                            &all_zeros,
+                            MFIB_SOURCE_DEFAULT_ROUTE,
+                            MFIB_RPF_ID_NONE,
+                            MFIB_ENTRY_FLAG_DROP);
+
+    const fib_route_path_t path = {
+        .frp_proto = DPO_PROTO_IP4,
+        .frp_addr = zero_addr,
+        .frp_sw_if_index = ~0,
+        .frp_fib_index = ~0,
+        .frp_weight = 1,
+        .frp_flags = FIB_ROUTE_PATH_LOCAL,
+        .frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
+    };
     int ii;
 
     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
     {
-        mfib_prefix_t prefix = ip4_specials[ii];
-
-        prefix.fp_src_addr.ip4.data_u32 =
-            clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
-        prefix.fp_grp_addr.ip4.data_u32 =
-            clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);
-
-        mfib_table_entry_update(mfib_table->mft_index,
-                                &prefix,
-                                MFIB_SOURCE_DEFAULT_ROUTE,
-                                MFIB_RPF_ID_NONE,
-                                MFIB_ENTRY_FLAG_DROP);
+        mfib_table_entry_path_update(mfib_table->mft_index,
+                                     &ip4_specials[ii],
+                                     MFIB_SOURCE_SPECIAL,
+                                     &path);
     }
 
     return (mfib_table->mft_index);
@@ -89,18 +107,15 @@ ip4_mfib_table_destroy (ip4_mfib_t *mfib)
     /*
      * remove all the specials we added when the table was created.
      */
+    mfib_table_entry_delete(mfib_table->mft_index,
+                            &all_zeros,
+                            MFIB_SOURCE_DEFAULT_ROUTE);
+
     for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
     {
-        fib_node_index_t mfei;
-        mfib_prefix_t prefix = ip4_specials[ii];
-
-        prefix.fp_src_addr.ip4.data_u32 =
-            clib_host_to_net_u32(prefix.fp_src_addr.ip4.data_u32);
-        prefix.fp_grp_addr.ip4.data_u32 =
-            clib_host_to_net_u32(prefix.fp_grp_addr.ip4.data_u32);
-
-        mfei = mfib_table_lookup(mfib_table->mft_index, &prefix);
-        mfib_table_entry_delete_index(mfei, MFIB_SOURCE_DEFAULT_ROUTE);
+        mfib_table_entry_delete(mfib_table->mft_index,
+                                &ip4_specials[ii],
+                                MFIB_SOURCE_SPECIAL);
     }
 
     /*
@@ -113,6 +128,42 @@ ip4_mfib_table_destroy (ip4_mfib_t *mfib)
     pool_put(ip4_main.mfibs, mfib_table);
 }
 
+void
+ip4_mfib_interface_enable_disable (u32 sw_if_index, int is_enable)
+{
+    const fib_route_path_t path = {
+        .frp_proto = DPO_PROTO_IP4,
+        .frp_addr = zero_addr,
+        .frp_sw_if_index = sw_if_index,
+        .frp_fib_index = ~0,
+        .frp_weight = 1,
+        .frp_mitf_flags = MFIB_ITF_FLAG_ACCEPT,
+    };
+    u32 mfib_index;
+    int ii;
+
+    vec_validate (ip4_main.mfib_index_by_sw_if_index, sw_if_index);
+    mfib_index = ip4_mfib_table_get_index_for_sw_if_index(sw_if_index);
+
+    for (ii = 0; ii < ARRAY_LEN(ip4_specials); ii++)
+    {
+        if (is_enable)
+        {
+            mfib_table_entry_path_update(mfib_index,
+                                         &ip4_specials[ii],
+                                         MFIB_SOURCE_SPECIAL,
+                                         &path);
+        }
+        else
+        {
+            mfib_table_entry_path_remove(mfib_index,
+                                         &ip4_specials[ii],
+                                         MFIB_SOURCE_SPECIAL,
+                                         &path);
+        }
+    }
+}
+
 u32
 ip4_mfib_table_find_or_create_and_lock (u32 table_id,
                                         mfib_source_t src)
diff --git a/src/vnet/mfib/ip4_mfib.h b/src/vnet/mfib/ip4_mfib.h
index 5b225596469..2e263a497d2 100644
--- a/src/vnet/mfib/ip4_mfib.h
+++ b/src/vnet/mfib/ip4_mfib.h
@@ -56,6 +56,13 @@ extern void ip4_mfib_table_entry_insert(ip4_mfib_t *fib,
 extern void ip4_mfib_table_destroy(ip4_mfib_t *fib);
 
 /**
+ * @brief
+ *  Add/remove the interface from the accepting list of the special MFIB entries
+ */
+extern void ip4_mfib_interface_enable_disable(u32 sw_if_index,
+                                              int is_enable);
+
+/**
  * @brief Get the FIB at the given index
  */
 static inline ip4_mfib_t *
diff --git a/src/vnet/mfib/mfib_types.h b/src/vnet/mfib/mfib_types.h
index 650a7a5c3f9..edc25fe5b99 100644
--- a/src/vnet/mfib/mfib_types.h
+++ b/src/vnet/mfib/mfib_types.h
@@ -172,6 +172,7 @@ typedef enum mfib_source_t_
     MFIB_SOURCE_GENEVE,
     MFIB_SOURCE_IGMP,
     MFIB_SOURCE_VXLAN_GBP,
+    MFIB_SOURCE_PLUGIN_LOW,
     MFIB_SOURCE_RR,
     MFIB_SOURCE_DEFAULT_ROUTE,
 } mfib_source_t;
@@ -189,6 +190,7 @@ typedef enum mfib_source_t_
     [MFIB_SOURCE_GENEVE] = "Geneve",               \
     [MFIB_SOURCE_IGMP] = "IGMP",                   \
     [MFIB_SOURCE_VXLAN_GBP] = "VXLAN-GBP",         \
+    [MFIB_SOURCE_PLUGIN_LOW] = "plugin-low",       \
     [MFIB_SOURCE_RR] = "Recursive-resolution",     \
     [MFIB_SOURCE_DEFAULT_ROUTE] = "Default Route", \
 }