pimd: pim bfd support

All PIM Neighbors for a given pim interface is registered with
BFD.
Upon receiving BFD status down event, PIM Neighbor with BFD info is deleted.
Add pim bfd configuraiton (CLI) per interface, '[no] ip pim bfd'

Testing Done:
Configure BFD under PIM interface on all neighbor routers,
check bfd sessions up, remote end unconfigure BFD, results in BFD session down.
Previous state was UP to New state DOWN, results in PIM neighbor delete behind
that particular pim interface.
Pim-smoke Results:
Ran 94 tests in 7409.680s
FAILED (SKIP=8, failures=2)

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>

1 files changed, 101 insertions, 0 deletions

diff --git a/pimd/pim_cmd.c b/pimd/pim_cmd.c
index da07dcb4ac..60b0b9bf2e 100644
--- a/pimd/pim_cmd.c
+++ b/pimd/pim_cmd.c
@@ -57,6 +57,8 @@
 #include "pim_msdp.h"
 #include "pim_ssm.h"
 #include "pim_nht.h"
+#include "pim_bfd.h"
+#include "bfd.h"
 
 static struct cmd_node pim_global_node = {
   PIM_NODE,
@@ -1508,6 +1510,7 @@ static void pim_show_neighbors_single(struct vty *vty, const char *neighbor, u_c
         vty_out(vty, "    Hello Option - Holdtime        : %s%s", option_holdtime ? "yes" : "no", VTY_NEWLINE);
         vty_out(vty, "    Hello Option - LAN Prune Delay : %s%s", option_lan_prune_delay ? "yes" : "no", VTY_NEWLINE);
         vty_out(vty, "    Hello Option - T-bit           : %s%s", option_t_bit ? "yes" : "no", VTY_NEWLINE);
+        pim_bfd_show_info (vty, neigh->bfd_info, json_ifp, uj, 0);
         vty_out(vty, "%s", VTY_NEWLINE);
       }
     }
@@ -5927,6 +5930,99 @@ DEFUN (interface_no_pim_use_source,
   return interface_pim_use_src_cmd_worker (vty, "0.0.0.0");
 }
 
+DEFUN (ip_pim_bfd,
+       ip_pim_bfd_cmd,
+       "ip pim bfd",
+       IP_STR
+       PIM_STR
+       "Enables BFD support\n")
+{
+  VTY_DECLVAR_CONTEXT(interface, ifp);
+  struct pim_interface *pim_ifp = NULL;
+  struct bfd_info *bfd_info = NULL;
+
+  if (!ifp)
+    return CMD_SUCCESS;
+  pim_ifp = ifp->info;
+  if (!pim_ifp)
+    return CMD_SUCCESS;
+  bfd_info = pim_ifp->bfd_info;
+
+  if (!bfd_info || !CHECK_FLAG (bfd_info->flags, BFD_FLAG_PARAM_CFG))
+    pim_bfd_if_param_set (ifp, BFD_DEF_MIN_RX, BFD_DEF_MIN_TX,
+                          BFD_DEF_DETECT_MULT, 1);
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (no_ip_pim_bfd,
+       no_ip_pim_bfd_cmd,
+       "no ip pim bfd",
+       NO_STR
+       IP_STR
+       PIM_STR
+       "Disables BFD support\n")
+{
+  VTY_DECLVAR_CONTEXT(interface, ifp);
+  struct pim_interface *pim_ifp = NULL;
+
+  assert (ifp);
+
+  pim_ifp = ifp->info;
+  if (!pim_ifp)
+    return CMD_SUCCESS;
+
+  if (pim_ifp->bfd_info)
+    {
+      pim_bfd_reg_dereg_all_nbr (ifp, ZEBRA_BFD_DEST_DEREGISTER);
+      bfd_info_free (&(pim_ifp->bfd_info));
+    }
+
+  return CMD_SUCCESS;
+}
+
+DEFUN (ip_pim_bfd_param,
+       ip_pim_bfd_param_cmd,
+       "ip pim bfd (2-255) (50-60000) (50-60000)",
+       IP_STR
+       PIM_STR
+       "Enables BFD support\n"
+       "Detect Multiplier\n"
+       "Required min receive interval\n"
+       "Desired min transmit interval\n")
+{
+  VTY_DECLVAR_CONTEXT(interface, ifp);
+  int idx_number = 3;
+  int idx_number_2 = 4;
+  int idx_number_3 = 5;
+  u_int32_t rx_val;
+  u_int32_t tx_val;
+  u_int8_t dm_val;
+  int ret;
+
+
+  if ((ret = bfd_validate_param (vty, argv[idx_number]->arg,
+                                 argv[idx_number_2]->arg,
+                                 argv[idx_number_3]->arg,
+                                 &dm_val, &rx_val, &tx_val)) != CMD_SUCCESS)
+    return ret;
+
+  pim_bfd_if_param_set (ifp, rx_val, tx_val, dm_val, 0);
+
+  return CMD_SUCCESS;
+}
+
+ALIAS (no_ip_pim_bfd,
+       no_ip_pim_bfd_param_cmd,
+       "no ip pim bfd (2-255) (50-60000) (50-60000)",
+       NO_STR
+       IP_STR
+       PIM_STR
+       "Enables BFD support\n"
+       "Detect Multiplier\n"
+       "Required min receive interval\n"
+       "Desired min transmit interval\n")
+
 static int
 ip_msdp_peer_cmd_worker (struct vty *vty, const char *peer, const char *local)
 {
@@ -6910,4 +7006,9 @@ void pim_cmd_init()
   install_element (VIEW_NODE, &show_ip_pim_group_type_cmd);
   install_element (INTERFACE_NODE, &interface_pim_use_source_cmd);
   install_element (INTERFACE_NODE, &interface_no_pim_use_source_cmd);
+  /* Install BFD command */
+  install_element (INTERFACE_NODE, &ip_pim_bfd_cmd);
+  install_element (INTERFACE_NODE, &ip_pim_bfd_param_cmd);
+  install_element (INTERFACE_NODE, &no_ip_pim_bfd_cmd);
+  install_element (INTERFACE_NODE, &no_ip_pim_bfd_param_cmd);
 }