This patch adds support for a new BFD session down message from zebra to

protocols. BGP and OSPF are integrated to respond this BFD session down message
originated in Zebra via ptmd.

BGP and OSPF now have a bfd command, which tells OSPF/BGP to respond to the
BFD session down message.

OSPF:

interface <>
 ip ospf bfd

BGP:

router bgp <>
  neighbor <> bfd

Please note that these commands don't enable BFD as a protocol. BFD configuration
and paramter tuning are via BFD applicable UI.

Signed-off-by: Vipin Kumar <vipin@cumulusnetworks.com>
Reviewed-by: Shrijeet Mukherjee <shm@cumulusnetworks.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/ospfd/ospf_zebra.c b/ospfd/ospf_zebra.c
index 94edc2863..378527824 100644
--- a/ospfd/ospf_zebra.c
+++ b/ospfd/ospf_zebra.c
@@ -44,6 +44,9 @@
 #include "ospfd/ospf_lsa.h"
 #include "ospfd/ospf_dump.h"
 #include "ospfd/ospf_route.h"
+#include "ospfd/ospf_lsdb.h"
+#include "ospfd/ospf_neighbor.h"
+#include "ospfd/ospf_nsm.h"
 #include "ospfd/ospf_zebra.h"
 #ifdef HAVE_SNMP
 #include "ospfd/ospf_snmp.h"
@@ -324,6 +327,52 @@ ospf_interface_address_delete (int command, struct zclient *zclient,
   return 0;
 }
 
+static int
+ospf_interface_bfd_dest_down (int command, struct zclient *zclient,
+                              zebra_size_t length)
+{
+  struct interface *ifp;
+  struct ospf_interface *oi;
+  struct ospf_if_params *params;
+  struct ospf_neighbor *nbr;
+  struct route_node *node;
+  struct prefix p;
+
+  ifp = zebra_interface_bfd_read (zclient->ibuf, &p);
+
+  if (ifp == NULL)
+    return 0;
+
+  if (IS_DEBUG_OSPF (zebra, ZEBRA_INTERFACE))
+    {
+      char buf[128];
+      prefix2str(&p, buf, sizeof(buf));
+      zlog_debug("Zebra: interface %s bfd destination %s down", ifp->name, buf);
+    }
+
+  params = IF_DEF_PARAMS (ifp);
+  if (!OSPF_IF_PARAM_CONFIGURED (params, bfd))
+    return 0;
+
+  for (node = route_top (IF_OIFS (ifp)); node; node = route_next (node))
+    {
+      if ((oi = node->info) == NULL)
+        continue;
+
+      nbr = ospf_nbr_lookup_by_addr (oi->nbrs, &p.u.prefix4);
+      if (!nbr)
+        continue;
+
+      if (IS_DEBUG_OSPF (nsm, NSM_EVENTS))
+        zlog_debug ("NSM[%s:%s]: BFD Down",
+                    IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4));
+
+      OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer);
+    }
+
+  return 0;
+}
+
 void
 ospf_zebra_add (struct prefix_ipv4 *p, struct ospf_route *or)
 {
@@ -1324,6 +1373,7 @@ ospf_zebra_init ()
   zclient->interface_down = ospf_interface_state_down;
   zclient->interface_address_add = ospf_interface_address_add;
   zclient->interface_address_delete = ospf_interface_address_delete;
+  zclient->interface_bfd_dest_down = ospf_interface_bfd_dest_down;
   zclient->ipv4_route_add = ospf_zebra_read_ipv4;
   zclient->ipv4_route_delete = ospf_zebra_read_ipv4;