zebra: dummy kernel "install" multicast routes

This is a followup to 9511633 ("zebra: MBGP routes should not be
installed in the kernel"), which was correct in disabling MRIB routes
being installed in the kernel, yet broke the MRIB since now routes were
never marked as active.

Hence, push down the check into the kernel install functions, so that
the routes are still marked active.  At the same time, the FPM calls get
a check each since otherwise we'd bump the FPM interface on MRIB
updates.

Fixes: 9511633 ("zebra: MBGP routes should not be installed in the kernel")
Cc: Everton Marques <everton.marques@gmail.com>
Cc: Balaji G <balajig81@gmail.com>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

diff --git a/zebra/zebra_rib.c b/zebra/zebra_rib.c
index 3503310ecfe7d29092556a551d3c033e453c326d..e428471564362ad0e6da17cc55a00e7328e0bd86 100644 (file)
--- a/zebra/zebra_rib.c
+++ b/zebra/zebra_rib.c
@@ -1160,8 +1160,16 @@ rib_install_kernel (struct route_node *rn, struct rib *rib, int update)
 {
   int ret = 0;
   struct nexthop *nexthop, *tnexthop;
+  rib_table_info_t *info = rn->table->info;
   int recursing;
 
+  if (info->safi != SAFI_UNICAST)
+    {
+      for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
+        SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
+      return ret;
+    }
+
   /*
    * Make sure we update the FPM any time we send new information to
    * the kernel.
@@ -1207,8 +1215,16 @@ rib_uninstall_kernel (struct route_node *rn, struct rib *rib)
 {
   int ret = 0;
   struct nexthop *nexthop, *tnexthop;
+  rib_table_info_t *info = rn->table->info;
   int recursing;
 
+  if (info->safi != SAFI_UNICAST)
+    {
+      for (ALL_NEXTHOPS_RO(rib->nexthop, nexthop, tnexthop, recursing))
+        SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
+      return ret;
+    }
+
   /*
    * Make sure we update the FPM any time we send new information to
    * the kernel.
@@ -1235,9 +1251,12 @@ rib_uninstall_kernel (struct route_node *rn, struct rib *rib)
 static void
 rib_uninstall (struct route_node *rn, struct rib *rib)
 {
+  rib_table_info_t *info = rn->table->info;
+
   if (CHECK_FLAG (rib->flags, ZEBRA_FLAG_SELECTED))
     {
-      zfpm_trigger_update (rn, "rib_uninstall");
+      if (info->safi == SAFI_UNICAST)
+        zfpm_trigger_update (rn, "rib_uninstall");
 
       redistribute_delete (&rn->p, rib);
       if (! RIB_SYSTEM_ROUTE (rib))
@@ -1710,7 +1729,8 @@ rib_process (struct route_node *rn)
                     select, fib);
       if (CHECK_FLAG (select->flags, ZEBRA_FLAG_CHANGED))
         {
-         zfpm_trigger_update (rn, "updating existing route");
+          if (info->safi == SAFI_UNICAST)
+           zfpm_trigger_update (rn, "updating existing route");
 
           /* Set real nexthop. */
          /* Need to check if any NHs are active to clear the
@@ -1781,7 +1801,8 @@ rib_process (struct route_node *rn)
       if (IS_ZEBRA_DEBUG_RIB)
        rnode_debug (rn, vrf_id, "Removing existing route, fib %p", fib);
 
-      zfpm_trigger_update (rn, "removing existing route");
+      if (info->safi == SAFI_UNICAST)
+        zfpm_trigger_update (rn, "removing existing route");
 
       /* If there's no route to replace this with, withdraw redistribute and
        * uninstall from kernel.
@@ -1813,7 +1834,8 @@ rib_process (struct route_node *rn)
       if (IS_ZEBRA_DEBUG_RIB)
        rnode_debug (rn, "Adding route, select %p", select);
 
-      zfpm_trigger_update (rn, "new route selected");
+      if (info->safi == SAFI_UNICAST)
+        zfpm_trigger_update (rn, "new route selected");
 
       /* Set real nexthop. */
       if (nexthop_active_update (rn, select, 1))
@@ -3931,6 +3953,7 @@ void
 rib_close_table (struct route_table *table)
 {
   struct route_node *rn;
+  rib_table_info_t *info = table->info;
   struct rib *rib;
 
   if (table)
@@ -3940,7 +3963,8 @@ rib_close_table (struct route_table *table)
           if (!CHECK_FLAG (rib->flags, ZEBRA_FLAG_SELECTED))
            continue;
 
-         zfpm_trigger_update (rn, NULL);
+          if (info->safi == SAFI_UNICAST)
+            zfpm_trigger_update (rn, NULL);
 
          if (! RIB_SYSTEM_ROUTE (rib))
            rib_uninstall_kernel (rn, rib);