*: add indent control files

[mirror_frr.git] / ospfd / ospf_ri.c

/*
 * This is an implementation of RFC4970 Router Information
 * with support of RFC5088 PCE Capabilites announcement
 *
 * Module name: Router Information
 * Version:     0.99.22
 * Created:     2012-02-01 by Olivier Dugeon
 * Copyright (C) 2012 Orange Labs http://www.orange.com/
 *
 * This file is part of GNU Quagga.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Quagga is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>
#include <math.h>

#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "vty.h"
#include "stream.h"
#include "log.h"
#include "thread.h"
#include "hash.h"
#include "sockunion.h"          /* for inet_aton() */

#include "ospfd/ospfd.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_ism.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_nsm.h"
#include "ospfd/ospf_flood.h"
#include "ospfd/ospf_packet.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_dump.h"
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_ase.h"
#include "ospfd/ospf_zebra.h"
#include "ospfd/ospf_ri.h"
#include "ospfd/ospf_te.h"

struct ospf_pce_info
{

  /* Store Router Information PCE TLV and SubTLV in network byte order. */
  struct ri_tlv_pce pce_header;
  struct ri_pce_subtlv_address pce_address;
  struct ri_pce_subtlv_path_scope pce_scope;
  struct list *pce_domain;
  struct list *pce_neighbor;
  struct ri_pce_subtlv_cap_flag pce_cap_flag;
};

/* Following structure are internal use only. */
struct ospf_router_info
{
  status_t status;

  u_int8_t registered;
  u_int8_t scope;

  /* Flags to manage this router information. */
#define RIFLG_LOOKUP_DONE			0x1
#define RIFLG_LSA_ENGAGED			0x2
#define RIFLG_LSA_FORCED_REFRESH	0x4
  u_int32_t flags;

  /* area pointer if flooding is Type 10 Null if flooding is AS scope */
  struct ospf_area *area;
  struct in_addr area_id;

  /* Store Router Information Capabilities LSA */
  struct ri_tlv_router_cap router_cap;

  /* Store PCE capability LSA */
  struct ospf_pce_info pce_info;
};

/*
 * Global variable to manage Opaque-LSA/Router Information on this node.
 * Note that all parameter values are stored in network byte order.
 */
static struct ospf_router_info OspfRI;

/*------------------------------------------------------------------------------*
 * Followings are initialize/terminate functions for Router Information handling.
 *------------------------------------------------------------------------------*/

static void ospf_router_info_ism_change (struct ospf_interface *oi,
                                         int old_status);
static void ospf_router_info_nsm_change (struct ospf_neighbor *nbr,
                                         int old_status);
static void ospf_router_info_config_write_router (struct vty *vty);
static void ospf_router_info_show_info (struct vty *vty,
                                        struct ospf_lsa *lsa);
static int ospf_router_info_lsa_originate (void *arg);
static struct ospf_lsa *ospf_router_info_lsa_refresh (struct ospf_lsa *lsa);
static void ospf_router_info_lsa_schedule (opcode_t opcode);
static void ospf_router_info_register_vty (void);
static void del_pce_info (void *val);

int
ospf_router_info_init (void)
{

  memset (&OspfRI, 0, sizeof (struct ospf_router_info));
  OspfRI.status = disabled;
  OspfRI.registered = 0;
  OspfRI.scope = OSPF_OPAQUE_AS_LSA;
  OspfRI.flags = 0;

  /* Initialize pce domain and neighbor list */
  OspfRI.pce_info.pce_domain = list_new ();
  OspfRI.pce_info.pce_domain->del = del_pce_info;
  OspfRI.pce_info.pce_neighbor = list_new ();
  OspfRI.pce_info.pce_neighbor->del = del_pce_info;

  ospf_router_info_register_vty ();

  return 0;
}

static int
ospf_router_info_register (u_int8_t scope)
{
  int rc = 0;

  if (OspfRI.registered)
    return 0;

  zlog_info ("Register Router Information with scope %s(%d)",
             scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS", scope);
  rc = ospf_register_opaque_functab (scope,
                                     OPAQUE_TYPE_ROUTER_INFORMATION_LSA,
                                     NULL,    /* new interface */
                                     NULL,    /* del interface */
                                     ospf_router_info_ism_change,
                                     ospf_router_info_nsm_change,
                                     ospf_router_info_config_write_router,
                                     NULL,    /* Config. write interface */
                                     NULL,    /* Config. write debug */
                                     ospf_router_info_show_info,
                                     ospf_router_info_lsa_originate,
                                     ospf_router_info_lsa_refresh,
                                     NULL,    /* new_lsa_hook */
                                     NULL);   /* del_lsa_hook */

  if (rc != 0)
    {
      zlog_warn ("ospf_router_info_init: Failed to register functions");
      return rc;
    }

  OspfRI.registered = 1;
  OspfRI.scope = scope;
  return 0;
}

static int
ospf_router_info_unregister ()
{

  if ((OspfRI.scope != OSPF_OPAQUE_AS_LSA)
      && (OspfRI.scope != OSPF_OPAQUE_AREA_LSA))
    {
      zlog_warn ("Unable to unregister Router Info functions: Wrong scope!");
      return -1;
    }

  ospf_delete_opaque_functab (OspfRI.scope,
                              OPAQUE_TYPE_ROUTER_INFORMATION_LSA);

  OspfRI.registered = 0;
  return 0;

}

void
ospf_router_info_term (void)
{

  list_delete (OspfRI.pce_info.pce_domain);
  list_delete (OspfRI.pce_info.pce_neighbor);

  OspfRI.pce_info.pce_domain = NULL;
  OspfRI.pce_info.pce_neighbor = NULL;
  OspfRI.status = disabled;

  ospf_router_info_unregister ();

  return;
}

static void
del_pce_info (void *val)
{
  XFREE (MTYPE_OSPF_PCE_PARAMS, val);
  return;
}

/*------------------------------------------------------------------------*
 * Followings are control functions for ROUTER INFORMATION parameters management.
 *------------------------------------------------------------------------*/

static void
set_router_info_capabilities (struct ri_tlv_router_cap *ric, u_int32_t cap)
{
  ric->header.type = htons (RI_TLV_CAPABILITIES);
  ric->header.length = htons (RI_TLV_LENGTH);
  ric->value = htonl (cap);
  return;
}

static int
set_pce_header (struct ospf_pce_info *pce)
{
  u_int16_t length = 0;
  struct listnode *node;
  struct ri_pce_subtlv_domain *domain;
  struct ri_pce_subtlv_neighbor *neighbor;

  /* PCE Address */
  if (ntohs (pce->pce_address.header.type) != 0)
    length += RI_TLV_SIZE (&pce->pce_address.header);

  /* PCE Path Scope */
  if (ntohs (pce->pce_scope.header.type) != 0)
    length += RI_TLV_SIZE (&pce->pce_scope.header);

  /* PCE Domain */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_domain, node, domain))
    {
      if (ntohs (domain->header.type) != 0)
        length += RI_TLV_SIZE (&domain->header);
    }

  /* PCE Neighbor */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_neighbor, node, neighbor))
    {
      if (ntohs (neighbor->header.type) != 0)
        length += RI_TLV_SIZE (&neighbor->header);
    }

  /* PCE Capabilities */
  if (ntohs (pce->pce_cap_flag.header.type) != 0)
    length += RI_TLV_SIZE (&pce->pce_cap_flag.header);

  if (length != 0)
    {
      pce->pce_header.header.type = htons (RI_TLV_PCE);
      pce->pce_header.header.length = htons (length);
    }
  else
    {
      pce->pce_header.header.type = 0;
      pce->pce_header.header.length = 0;
    }

  return length;
}

static void
set_pce_address (struct in_addr ipv4, struct ospf_pce_info *pce)
{

  /* Enable PCE Info */
  pce->pce_header.header.type = htons (RI_TLV_PCE);
  /* Set PCE Address */
  pce->pce_address.header.type = htons (RI_PCE_SUBTLV_ADDRESS);
  pce->pce_address.header.length = htons (PCE_ADDRESS_LENGTH_IPV4);
  pce->pce_address.address.type = htons (PCE_ADDRESS_TYPE_IPV4);
  pce->pce_address.address.value = ipv4;

  return;
}

static void
set_pce_path_scope (u_int32_t scope, struct ospf_pce_info *pce)
{

  /* Enable PCE Info */
  pce->pce_header.header.type = htons (RI_TLV_PCE);
  /* Set PCE Scope */
  pce->pce_scope.header.type = htons (RI_PCE_SUBTLV_PATH_SCOPE);
  pce->pce_scope.header.length = htons (RI_TLV_LENGTH);
  pce->pce_scope.value = htonl (scope);

  return;
}

static void
set_pce_domain (u_int16_t type, u_int32_t domain, struct ospf_pce_info *pce)
{

  struct ri_pce_subtlv_domain *new;

  /* Enable PCE Info */
  pce->pce_header.header.type = htons (RI_TLV_PCE);

  /* Create new domain info */
  new =
    XCALLOC (MTYPE_OSPF_PCE_PARAMS,
             sizeof (struct ri_pce_subtlv_domain));

  new->header.type = htons (RI_PCE_SUBTLV_DOMAIN);
  new->header.length = htons (PCE_ADDRESS_LENGTH_IPV4);
  new->type = htons (type);
  new->value = htonl (domain);

  /* Add new domain to the list */
  listnode_add (pce->pce_domain, new);

  return;
}

static void
unset_pce_domain (u_int16_t type, u_int32_t domain, struct ospf_pce_info *pce)
{
  struct listnode *node;
  struct ri_pce_subtlv_domain *old = NULL;
  int found = 0;

  /* Search the corresponding node */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_domain, node, old))
    {
      if ((old->type == htons (type)) && (old->value == htonl (domain)))
        {
          found = 1;
          break;
        }
    }

  /* if found remove it */
  if (found)
    {
      listnode_delete (pce->pce_domain, old);

      /* Avoid misjudgement in the next lookup. */
      if (listcount (pce->pce_domain) == 0)
        pce->pce_domain->head = pce->pce_domain->tail = NULL;

      /* Finally free the old domain */
      XFREE (MTYPE_OSPF_PCE_PARAMS, old);
    }
}

static void
set_pce_neighbor (u_int16_t type, u_int32_t domain, struct ospf_pce_info *pce)
{

  struct ri_pce_subtlv_neighbor *new;

  /* Enable PCE Info */
  pce->pce_header.header.type = htons (RI_TLV_PCE);

  /* Create new neighbor info */
  new =
    XCALLOC (MTYPE_OSPF_PCE_PARAMS,
             sizeof (struct ri_pce_subtlv_neighbor));

  new->header.type = htons (RI_PCE_SUBTLV_NEIGHBOR);
  new->header.length = htons (PCE_ADDRESS_LENGTH_IPV4);
  new->type = htons (type);
  new->value = htonl (domain);

  /* Add new domain to the list */
  listnode_add (pce->pce_neighbor, new);

  return;
}

static void
unset_pce_neighbor (u_int16_t type, u_int32_t domain,
                    struct ospf_pce_info *pce)
{
  struct listnode *node;
  struct ri_pce_subtlv_neighbor *old = NULL;
  int found = 0;

  /* Search the corresponding node */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_neighbor, node, old))
    {
      if ((old->type == htons (type)) && (old->value == htonl (domain)))
        {
          found = 1;
          break;
        }
    }

  /* if found remove it */
  if (found)
    {
      listnode_delete (pce->pce_neighbor, old);

      /* Avoid misjudgement in the next lookup. */
      if (listcount (pce->pce_neighbor) == 0)
        pce->pce_neighbor->head = pce->pce_neighbor->tail = NULL;

      /* Finally free the old domain */
      XFREE (MTYPE_OSPF_PCE_PARAMS, old);
    }
}

static void
set_pce_cap_flag (u_int32_t cap, struct ospf_pce_info *pce)
{

  /* Enable PCE Info */
  pce->pce_header.header.type = htons (RI_TLV_PCE);
  /* Set PCE Capabilities flag */
  pce->pce_cap_flag.header.type = htons (RI_PCE_SUBTLV_CAP_FLAG);
  pce->pce_cap_flag.header.length = htons (RI_TLV_LENGTH);
  pce->pce_cap_flag.value = htonl (cap);

  return;
}


static void
unset_param (struct ri_tlv_header *tlv)
{

  tlv->type = 0;
  /* Fill the Value to 0 */
  memset ((tlv + RI_TLV_HDR_SIZE), 0, RI_TLV_BODY_SIZE (tlv));
  tlv->length = 0;

  return;
}

static void
initialize_params (struct ospf_router_info *ori)
{
  u_int32_t cap;
  struct ospf *top;

  /*
   * Initialize default Router Information Capabilities.
   */
  cap = 0;
  cap = cap | RI_TE_SUPPORT;

  set_router_info_capabilities (&ori->router_cap, cap);

  /* If Area address is not null and exist, retrieve corresponding structure */
  top = ospf_lookup ();
  zlog_info ("RI-> Initialize Router Info for %s scope within area %s",
             OspfRI.scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS",
             inet_ntoa (OspfRI.area_id));

  /* Try to get the Area context at this step. Do it latter if not available */
  if ((OspfRI.scope == OSPF_OPAQUE_AREA_LSA) && (OspfRI.area == NULL))
    OspfRI.area = ospf_area_lookup_by_area_id (top, OspfRI.area_id);

  /*
   * Initialize default PCE Information values
   */
  /* PCE address == OSPF Router ID */
  set_pce_address (top->router_id, &ori->pce_info);

  /* PCE scope */
  cap = 7;                      /* Set L, R and Rd bits to one = intra & inter-area path computation */
  set_pce_path_scope (cap, &ori->pce_info);

  /* PCE Capabilities */
  cap =
    PCE_CAP_BIDIRECTIONAL | PCE_CAP_DIVERSE_PATH | PCE_CAP_OBJECTIVES |
    PCE_CAP_ADDITIVE | PCE_CAP_MULTIPLE_REQ;
  set_pce_cap_flag (cap, &ori->pce_info);

  /* Finally compute PCE header */
  set_pce_header (&ori->pce_info);

  return;
}

static int
is_mandated_params_set (struct ospf_router_info ori)
{
  int rc = 0;

  if (ntohs (ori.router_cap.header.type) == 0)
    goto out;

  if ((ntohs (ori.pce_info.pce_header.header.type) == RI_TLV_PCE)
      && (ntohs (ori.pce_info.pce_address.header.type) == 0)
      && (ntohs (ori.pce_info.pce_cap_flag.header.type) == 0))
    goto out;

  rc = 1;

out:
  return rc;
}

/*------------------------------------------------------------------------*
 * Followings are callback functions against generic Opaque-LSAs handling.
 *------------------------------------------------------------------------*/
static void
ospf_router_info_ism_change (struct ospf_interface *oi, int old_state)
{
  /* So far, nothing to do here. */
  return;

}

static void
ospf_router_info_nsm_change (struct ospf_neighbor *nbr, int old_state)
{

  /* So far, nothing to do here. */
  return;
}

/*------------------------------------------------------------------------*
 * Followings are OSPF protocol processing functions for ROUTER INFORMATION
 *------------------------------------------------------------------------*/

static void
build_tlv_header (struct stream *s, struct ri_tlv_header *tlvh)
{

  stream_put (s, tlvh, sizeof (struct ri_tlv_header));
  return;
}

static void
build_tlv (struct stream *s, struct ri_tlv_header *tlvh)
{

  if (ntohs (tlvh->type) != 0)
    {
      build_tlv_header (s, tlvh);
      stream_put (s, tlvh + 1, RI_TLV_BODY_SIZE (tlvh));
    }
  return;
}

static void
ospf_router_info_lsa_body_set (struct stream *s)
{

  struct listnode *node;
  struct ri_pce_subtlv_domain *domain;
  struct ri_pce_subtlv_neighbor *neighbor;

  /* Build Router Information TLV */
  build_tlv (s, &OspfRI.router_cap.header);

  /* Add RI PCE TLV if it is set */
  /* Compute PCE Info header first */
  if ((set_pce_header (&OspfRI.pce_info)) != 0)
    {

      /* Build PCE TLV */
      build_tlv_header (s, &OspfRI.pce_info.pce_header.header);

      /* Build PCE address sub-tlv */
      build_tlv (s, &OspfRI.pce_info.pce_address.header);

      /* Build PCE path scope sub-tlv */
      build_tlv (s, &OspfRI.pce_info.pce_scope.header);

      /* Build PCE domain sub-tlv */
      for (ALL_LIST_ELEMENTS_RO (OspfRI.pce_info.pce_domain, node, domain))
        build_tlv (s, &domain->header);

      /* Build PCE neighbor sub-tlv */
      for (ALL_LIST_ELEMENTS_RO
           (OspfRI.pce_info.pce_neighbor, node, neighbor))
        build_tlv (s, &neighbor->header);

      /* Build PCE cap flag sub-tlv */
      build_tlv (s, &OspfRI.pce_info.pce_cap_flag.header);
    }

  return;
}

/* Create new opaque-LSA. */
static struct ospf_lsa *
ospf_router_info_lsa_new ()
{
  struct ospf *top;
  struct stream *s;
  struct lsa_header *lsah;
  struct ospf_lsa *new = NULL;
  u_char options, lsa_type;
  struct in_addr lsa_id;
  u_int32_t tmp;
  u_int16_t length;

  /* Create a stream for LSA. */
  if ((s = stream_new (OSPF_MAX_LSA_SIZE)) == NULL)
    {
      zlog_warn ("ospf_router_info_lsa_new: stream_new() ?");
      goto out;
    }
  lsah = (struct lsa_header *) STREAM_DATA (s);

  options = OSPF_OPTION_E;      /* Enable AS external as we flood RI with Opaque Type 11 */
  options |= OSPF_OPTION_O;     /* Don't forget this :-) */

  lsa_type = OspfRI.scope;
  /* LSA ID == 0 for Router Information see RFC 4970 */
  tmp = SET_OPAQUE_LSID (OPAQUE_TYPE_ROUTER_INFORMATION_LSA, 0);
  lsa_id.s_addr = htonl (tmp);

  if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
    zlog_debug
      ("LSA[Type%d:%s]: Create an Opaque-LSA/ROUTER INFORMATION instance",
       lsa_type, inet_ntoa (lsa_id));

  top = ospf_lookup ();

  /* Set opaque-LSA header fields. */
  lsa_header_set (s, options, lsa_type, lsa_id, top->router_id);

  /* Set opaque-LSA body fields. */
  ospf_router_info_lsa_body_set (s);

  /* Set length. */
  length = stream_get_endp (s);
  lsah->length = htons (length);

  /* Now, create an OSPF LSA instance. */
  if ((new = ospf_lsa_new ()) == NULL)
    {
      zlog_warn ("ospf_router_info_lsa_new: ospf_lsa_new() ?");
      stream_free (s);
      goto out;
    }
  if ((new->data = ospf_lsa_data_new (length)) == NULL)
    {
      zlog_warn ("ospf_router_info_lsa_new: ospf_lsa_data_new() ?");
      ospf_lsa_unlock (&new);
      new = NULL;
      stream_free (s);
      goto out;
    }

  new->area = OspfRI.area;      /* Area must be null if the Opaque type is AS scope, fulfill otherwise */

  SET_FLAG (new->flags, OSPF_LSA_SELF);
  memcpy (new->data, lsah, length);
  stream_free (s);

out:return new;
}

static int
ospf_router_info_lsa_originate1 (void *arg)
{
  struct ospf_lsa *new;
  struct ospf *top;
  struct ospf_area *area;
  int rc = -1;

  /* First check if the area is known if flooding scope is Area */
  if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA)
    {
      area = (struct ospf_area *) arg;
      if (area->area_id.s_addr != OspfRI.area_id.s_addr)
        {
          zlog_debug
            ("RI -> This is not the Router Information Area. Stop processing");
          goto out;
        }
      OspfRI.area = area;
    }

  /* Create new Opaque-LSA/ROUTER INFORMATION instance. */
  if ((new = ospf_router_info_lsa_new ()) == NULL)
    {
      zlog_warn
        ("ospf_router_info_lsa_originate1: ospf_router_info_lsa_new() ?");
      goto out;
    }

  /* Get ospf info */
  top = ospf_lookup ();

  /* Install this LSA into LSDB. */
  if (ospf_lsa_install (top, NULL /*oi */ , new) == NULL)
    {
      zlog_warn ("ospf_router_info_lsa_originate1: ospf_lsa_install() ?");
      ospf_lsa_unlock (&new);
      goto out;
    }

  /* Now this Router Info parameter entry has associated LSA. */
  SET_FLAG (OspfRI.flags, RIFLG_LSA_ENGAGED);

  /* Update new LSA origination count. */
  top->lsa_originate_count++;

  /* Flood new LSA through AS. */
  if (OspfRI.scope == OSPF_OPAQUE_AS_LSA)
    ospf_flood_through_as (top, NULL /*nbr */ , new);
  else
    ospf_flood_through_area (OspfRI.area, NULL /*nbr */ , new);

  if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
    {
      zlog_debug ("LSA[Type%d:%s]: Originate Opaque-LSA/ROUTER INFORMATION",
                  new->data->type, inet_ntoa (new->data->id));
      ospf_lsa_header_dump (new->data);
    }

  rc = 0;
out:return rc;
}

static int
ospf_router_info_lsa_originate (void *arg)
{

  int rc = -1;

  if (OspfRI.status == disabled)
    {
      zlog_info
        ("ospf_router_info_lsa_originate: ROUTER INFORMATION is disabled now.");
      rc = 0;                   /* This is not an error case. */
      goto out;
    }

  /* Check if Router Information LSA is already engaged */
  if (OspfRI.flags & RIFLG_LSA_ENGAGED)
    {
      if (OspfRI.flags & RIFLG_LSA_FORCED_REFRESH)
        {
          OspfRI.flags &= ~RIFLG_LSA_FORCED_REFRESH;
          ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);
        }
    }
  else
    {
      if (!is_mandated_params_set (OspfRI))
        zlog_warn
          ("ospf_router_info_lsa_originate: lacks mandated ROUTER INFORMATION parameters");

      /* Ok, let's try to originate an LSA */
      if (ospf_router_info_lsa_originate1 (arg) != 0)
        goto out;
    }

  rc = 0;
out:return rc;
}

static struct ospf_lsa *
ospf_router_info_lsa_refresh (struct ospf_lsa *lsa)
{
  struct ospf_lsa *new = NULL;
  struct ospf *top;

  if (OspfRI.status == disabled)
    {
      /*
       * This LSA must have flushed before due to ROUTER INFORMATION status change.
       * It seems a slip among routers in the routing domain.
       */
      zlog_info
        ("ospf_router_info_lsa_refresh: ROUTER INFORMATION is disabled now.");
      lsa->data->ls_age = htons (OSPF_LSA_MAXAGE);      /* Flush it anyway. */
    }

  /* Verify that the Router Information ID is supported */
  if (GET_OPAQUE_ID (ntohl (lsa->data->id.s_addr)) != 0)
    {
      zlog_warn
        ("ospf_router_info_lsa_refresh: Unsupported Router Information ID");
      goto out;
    }

  /* If the lsa's age reached to MaxAge, start flushing procedure. */
  if (IS_LSA_MAXAGE (lsa))
    {
      OspfRI.flags &= ~RIFLG_LSA_ENGAGED;
      ospf_opaque_lsa_flush_schedule (lsa);
      goto out;
    }

  /* Create new Opaque-LSA/ROUTER INFORMATION instance. */
  if ((new = ospf_router_info_lsa_new ()) == NULL)
    {
      zlog_warn
        ("ospf_router_info_lsa_refresh: ospf_router_info_lsa_new() ?");
      goto out;
    }
  new->data->ls_seqnum = lsa_seqnum_increment (lsa);

  /* Install this LSA into LSDB. */
  /* Given "lsa" will be freed in the next function. */
  top = ospf_lookup ();
  if (ospf_lsa_install (top, NULL /*oi */ , new) == NULL)
    {
      zlog_warn ("ospf_router_info_lsa_refresh: ospf_lsa_install() ?");
      ospf_lsa_unlock (&new);
      goto out;
    }

  /* Flood updated LSA through AS or AREA depending of OspfRI.scope. */
  if (OspfRI.scope == OSPF_OPAQUE_AS_LSA)
    ospf_flood_through_as (top, NULL /*nbr */ , new);
  else
    ospf_flood_through_area (OspfRI.area, NULL /*nbr */ , new);

  /* Debug logging. */
  if (IS_DEBUG_OSPF (lsa, LSA_GENERATE))
    {
      zlog_debug ("LSA[Type%d:%s]: Refresh Opaque-LSA/ROUTER INFORMATION",
                  new->data->type, inet_ntoa (new->data->id));
      ospf_lsa_header_dump (new->data);
    }

out:return new;
}

static void
ospf_router_info_lsa_schedule (opcode_t opcode)
{
  struct ospf_lsa lsa;
  struct lsa_header lsah;
  struct ospf *top;
  u_int32_t tmp;

  memset (&lsa, 0, sizeof (lsa));
  memset (&lsah, 0, sizeof (lsah));

  zlog_debug ("RI-> LSA schedule %s%s%s",
              opcode == REORIGINATE_THIS_LSA ? "Re-Originate" : "",
              opcode == REFRESH_THIS_LSA ? "Refresh" : "",
              opcode == FLUSH_THIS_LSA ? "Flush" : "");

  top = ospf_lookup ();
  if ((OspfRI.scope == OSPF_OPAQUE_AREA_LSA) && (OspfRI.area == NULL))
    {
      zlog_warn
        ("ospf_router_info_lsa_schedule(): Router Info is Area scope flooding but area is not set");
      OspfRI.area = ospf_area_lookup_by_area_id (top, OspfRI.area_id);
    }
  lsa.area = OspfRI.area;
  lsa.data = &lsah;
  lsah.type = OspfRI.scope;

  /* LSA ID is set to 0 for the Router Information. See RFC 4970 */
  tmp = SET_OPAQUE_LSID (OPAQUE_TYPE_ROUTER_INFORMATION_LSA, 0);
  lsah.id.s_addr = htonl (tmp);

  switch (opcode)
    {
    case REORIGINATE_THIS_LSA:
      if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA)
        ospf_opaque_lsa_reoriginate_schedule ((void *) OspfRI.area,
                                              OSPF_OPAQUE_AREA_LSA,
                                              OPAQUE_TYPE_ROUTER_INFORMATION_LSA);
      else
        ospf_opaque_lsa_reoriginate_schedule ((void *) top,
                                              OSPF_OPAQUE_AS_LSA,
                                              OPAQUE_TYPE_ROUTER_INFORMATION_LSA);
      break;
    case REFRESH_THIS_LSA:
      ospf_opaque_lsa_refresh_schedule (&lsa);
      break;
    case FLUSH_THIS_LSA:
      OspfRI.flags &= ~RIFLG_LSA_ENGAGED;
      ospf_opaque_lsa_flush_schedule (&lsa);
      break;
    default:
      zlog_warn ("ospf_router_info_lsa_schedule: Unknown opcode (%u)",
                 opcode);
      break;
    }

  return;
}

/*------------------------------------------------------------------------*
 * Followings are vty session control functions.
 *------------------------------------------------------------------------*/

static u_int16_t
show_vty_router_cap (struct vty *vty, struct ri_tlv_header *tlvh)
{
  struct ri_tlv_router_cap *top = (struct ri_tlv_router_cap *) tlvh;

  if (vty != NULL)
    vty_out (vty, "  Router Capabilities: 0x%x\n",ntohl(top->value));
    else
      zlog_debug ("    Router Capabilities: 0x%x", ntohl (top->value));

  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_subtlv_address (struct vty *vty, struct ri_tlv_header *tlvh)
{
  struct ri_pce_subtlv_address *top = (struct ri_pce_subtlv_address *) tlvh;

  if (ntohs (top->address.type) == PCE_ADDRESS_TYPE_IPV4)
    {
      if (vty != NULL)
        vty_out (vty, "  PCE Address: %s\n",inet_ntoa(top->address.value));
        else
          zlog_debug ("    PCE Address: %s", inet_ntoa (top->address.value));
    }
  else
    {
      /* TODO: Add support to IPv6 with inet_ntop() */
      if (vty != NULL)
        vty_out (vty, "  PCE Address: 0x%x\n",
                 ntohl(top->address.value.s_addr));
        else
          zlog_debug ("    PCE Address: 0x%x",
	                    ntohl (top->address.value.s_addr));
    }

  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_subtlv_path_scope (struct vty *vty, struct ri_tlv_header *tlvh)
{
  struct ri_pce_subtlv_path_scope *top =
    (struct ri_pce_subtlv_path_scope *) tlvh;

  if (vty != NULL)
    vty_out (vty, "  PCE Path Scope: 0x%x\n",ntohl(top->value));
    else
      zlog_debug ("    PCE Path Scope: 0x%x", ntohl (top->value));

  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_subtlv_domain (struct vty *vty, struct ri_tlv_header *tlvh)
{
  struct ri_pce_subtlv_domain *top = (struct ri_pce_subtlv_domain *) tlvh;
  struct in_addr tmp;

  if (ntohs (top->type) == PCE_DOMAIN_TYPE_AREA)
    {
      tmp.s_addr = top->value;
      if (vty != NULL)
        vty_out (vty, "  PCE domain Area: %s\n",inet_ntoa(tmp));
        else
          zlog_debug ("    PCE domain Area: %s", inet_ntoa (tmp));
    }
  else
    {
      if (vty != NULL)
        vty_out (vty, "  PCE domain AS: %d\n",ntohl(top->value));
        else
          zlog_debug ("    PCE domain AS: %d", ntohl (top->value));
    }
  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_subtlv_neighbor (struct vty *vty, struct ri_tlv_header *tlvh)
{

  struct ri_pce_subtlv_neighbor *top = (struct ri_pce_subtlv_neighbor *) tlvh;
  struct in_addr tmp;

  if (ntohs (top->type) == PCE_DOMAIN_TYPE_AREA)
    {
      tmp.s_addr = top->value;
      if (vty != NULL)
        vty_out (vty, "  PCE neighbor Area: %s\n",inet_ntoa(tmp));
        else
          zlog_debug ("    PCE neighbor Area: %s", inet_ntoa (tmp));
    }
  else
    {
      if (vty != NULL)
        vty_out (vty, "  PCE neighbor AS: %d\n",ntohl(top->value));
        else
          zlog_debug ("    PCE neighbor AS: %d", ntohl (top->value));
    }
  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_subtlv_cap_flag (struct vty *vty, struct ri_tlv_header *tlvh)
{
  struct ri_pce_subtlv_cap_flag *top = (struct ri_pce_subtlv_cap_flag *) tlvh;

  if (vty != NULL)
    vty_out (vty, "  PCE Capabilities Flag: 0x%x\n",ntohl(top->value));
    else
      zlog_debug ("    PCE Capabilities Flag: 0x%x", ntohl (top->value));

  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_unknown_tlv (struct vty *vty, struct ri_tlv_header *tlvh)
{
  if (vty != NULL)
    vty_out (vty, "  Unknown TLV: [type(0x%x), length(0x%x)]\n",
             ntohs (tlvh->type), ntohs(tlvh->length));
    else
      zlog_debug ("    Unknown TLV: [type(0x%x), length(0x%x)]",
	                ntohs (tlvh->type), ntohs (tlvh->length));

  return RI_TLV_SIZE (tlvh);
}

static u_int16_t
show_vty_pce_info (struct vty *vty, struct ri_tlv_header *ri, uint32_t total)
{
  struct ri_tlv_header *tlvh;
  u_int16_t sum = 0;

  for (tlvh = ri; sum < total; tlvh = RI_TLV_HDR_NEXT (tlvh))
    {
      switch (ntohs (tlvh->type))
        {
        case RI_PCE_SUBTLV_ADDRESS:
          sum += show_vty_pce_subtlv_address (vty, tlvh);
          break;
        case RI_PCE_SUBTLV_PATH_SCOPE:
          sum += show_vty_pce_subtlv_path_scope (vty, tlvh);
          break;
        case RI_PCE_SUBTLV_DOMAIN:
          sum += show_vty_pce_subtlv_domain (vty, tlvh);
          break;
        case RI_PCE_SUBTLV_NEIGHBOR:
          sum += show_vty_pce_subtlv_neighbor (vty, tlvh);
          break;
        case RI_PCE_SUBTLV_CAP_FLAG:
          sum += show_vty_pce_subtlv_cap_flag (vty, tlvh);
          break;
        default:
          sum += show_vty_unknown_tlv (vty, tlvh);
          break;
        }
    }
  return sum;
}

static void
ospf_router_info_show_info (struct vty *vty, struct ospf_lsa *lsa)
{
  struct lsa_header *lsah = (struct lsa_header *) lsa->data;
  struct ri_tlv_header *tlvh;
  u_int16_t length = 0, sum = 0;

  /* Initialize TLV browsing */
  length = ntohs (lsah->length) - OSPF_LSA_HEADER_SIZE;

  for (tlvh = RI_TLV_HDR_TOP (lsah); sum < length;
       tlvh = RI_TLV_HDR_NEXT (tlvh))
    {
      switch (ntohs (tlvh->type))
        {
        case RI_TLV_CAPABILITIES:
          sum += show_vty_router_cap (vty, tlvh);
          break;
        case RI_TLV_PCE:
          tlvh++;
          sum += RI_TLV_HDR_SIZE;
          sum += show_vty_pce_info (vty, tlvh, length - sum);
          break;
        default:
          sum += show_vty_unknown_tlv (vty, tlvh);
          break;
        }
    }

  return;
}

static void
ospf_router_info_config_write_router (struct vty *vty)
{
  struct ospf_pce_info *pce = &OspfRI.pce_info;
  struct listnode *node;
  struct ri_pce_subtlv_domain *domain;
  struct ri_pce_subtlv_neighbor *neighbor;
  struct in_addr tmp;

  if (OspfRI.status == enabled)
    {
      if (OspfRI.scope == OSPF_OPAQUE_AS_LSA)
        vty_out (vty, " router-info as\n");
      else
        vty_out (vty, " router-info area %s\n",inet_ntoa(OspfRI.area_id));

      if (pce->pce_address.header.type != 0)
        vty_out (vty, "  pce address %s\n",
                 inet_ntoa(pce->pce_address.address.value));

      if (pce->pce_cap_flag.header.type != 0)
        vty_out (vty, "  pce flag 0x%x\n",ntohl(pce->pce_cap_flag.value));

      for (ALL_LIST_ELEMENTS_RO (pce->pce_domain, node, domain))
        {
          if (domain->header.type != 0)
            {
              if (domain->type == PCE_DOMAIN_TYPE_AREA)
                {
                  tmp.s_addr = domain->value;
                  vty_out (vty, "  pce domain area %s\n",inet_ntoa(tmp));
                }
              else
                {
                  vty_out (vty, "  pce domain as %d\n",ntohl(domain->value));
                }
            }
        }

      for (ALL_LIST_ELEMENTS_RO (pce->pce_neighbor, node, neighbor))
        {
          if (neighbor->header.type != 0)
            {
              if (neighbor->type == PCE_DOMAIN_TYPE_AREA)
                {
                  tmp.s_addr = neighbor->value;
                  vty_out (vty, "  pce neighbor area %s\n",inet_ntoa(tmp));
                }
              else
                {
                  vty_out (vty, "  pce neighbor as %d\n",
                           ntohl(neighbor->value));
                }
            }
        }

      if (pce->pce_scope.header.type != 0)
        vty_out (vty, "  pce scope 0x%x\n",
                 ntohl(OspfRI.pce_info.pce_scope.value));
    }
  return;
}

/*------------------------------------------------------------------------*
 * Followings are vty command functions.
 *------------------------------------------------------------------------*/

DEFUN (router_info,
       router_info_area_cmd,
       "router-info <as|area A.B.C.D>",
       OSPF_RI_STR
       "Enable the Router Information functionality with AS flooding scope\n"
       "Enable the Router Information functionality with Area flooding scope\n"
       "OSPF area ID in IP format")
{
  int idx_ipv4 = 2;
  char *area = (argc == 3) ? argv[idx_ipv4]->arg : NULL;

  u_int8_t scope;

  if (OspfRI.status == enabled)
    return CMD_SUCCESS;

  /* Check and get Area value if present */
  if (area)
    {
      if (!inet_aton (area, &OspfRI.area_id))
        {
          vty_out (vty, "%% specified Area ID %s is invalid\n",
                   area);
          return CMD_WARNING_CONFIG_FAILED;
        }
      scope = OSPF_OPAQUE_AREA_LSA;
    }
  else
    {
      OspfRI.area_id.s_addr = 0;
      scope = OSPF_OPAQUE_AS_LSA;
    }

  /* First start to register Router Information callbacks */
  if ((ospf_router_info_register (scope)) != 0)
    {
      zlog_warn ("Enable to register Router Information callbacks. Abort!");
      return CMD_WARNING_CONFIG_FAILED;
    }

  OspfRI.status = enabled;

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("RI-> Router Information (%s flooding): OFF -> ON",
                 OspfRI.scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS");

  /*
   * Following code is intended to handle two cases;
   *
   * 1) Router Information was disabled at startup time, but now become enabled.
   * 2) Router Information was once enabled then disabled, and now enabled again.
   */

  initialize_params (&OspfRI);

  /* Refresh RI LSA if already engaged */
  if (OspfRI.flags & RIFLG_LSA_ENGAGED)
    {
      zlog_debug ("RI-> Initial origination following configuration");
      ospf_router_info_lsa_schedule (REORIGINATE_THIS_LSA);
    }
  return CMD_SUCCESS;

}


DEFUN (no_router_info,
       no_router_info_cmd,
       "no router-info",
       NO_STR
       "Disable the Router Information functionality\n")
{

  if (OspfRI.status == disabled)
    return CMD_SUCCESS;

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("RI-> Router Information: ON -> OFF");

  if (OspfRI.flags & RIFLG_LSA_ENGAGED)
    ospf_router_info_lsa_schedule (FLUSH_THIS_LSA);

  /* Unregister the callbacks */
  ospf_router_info_unregister ();

  OspfRI.status = disabled;

  return CMD_SUCCESS;
}

static int
ospf_ri_enabled (struct vty *vty)
{
  if (OspfRI.status == enabled)
    return 1;

  if (vty)
    vty_out (vty, "%% OSPF RI is not turned on\n");

  return 0;
}

DEFUN (pce_address,
       pce_address_cmd,
       "pce address A.B.C.D",
       PCE_STR
       "Stable IP address of the PCE\n"
       "PCE address in IPv4 address format\n")
{
  int idx_ipv4 = 2;
  struct in_addr value;
  struct ospf_pce_info *pi = &OspfRI.pce_info;

  if (!ospf_ri_enabled (vty))
    return CMD_WARNING_CONFIG_FAILED;

  if (!inet_aton (argv[idx_ipv4]->arg, &value))
    {
      vty_out (vty, "Please specify PCE Address by A.B.C.D\n");
      return CMD_WARNING_CONFIG_FAILED;
    }

  if (ntohs (pi->pce_address.header.type) == 0
      || ntohl (pi->pce_address.address.value.s_addr) != ntohl (value.s_addr))
    {

      set_pce_address (value, pi);

      /* Refresh RI LSA if already engaged */
      if (OspfRI.flags & RIFLG_LSA_ENGAGED)
        ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);
    }

  return CMD_SUCCESS;
}

DEFUN (no_pce_address,
       no_pce_address_cmd,
       "no pce address [A.B.C.D]",
       NO_STR
       PCE_STR
       "Disable PCE address\n"
       "PCE address in IPv4 address format\n")
{

  unset_param (&OspfRI.pce_info.pce_address.header);

  /* Refresh RI LSA if already engaged */
  if ((OspfRI.status == enabled) && (OspfRI.flags & RIFLG_LSA_ENGAGED))
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (pce_path_scope,
       pce_path_scope_cmd,
       "pce scope BITPATTERN",
       PCE_STR
       "Path scope visibilities of the PCE for path computation\n"
       "32-bit Hexadecimal value\n")
{
  int idx_bitpattern = 2;
  uint32_t scope;
  struct ospf_pce_info *pi = &OspfRI.pce_info;

  if (!ospf_ri_enabled (vty))
    return CMD_WARNING_CONFIG_FAILED;

  if (sscanf (argv[idx_bitpattern]->arg, "0x%x", &scope) != 1)
    {
      vty_out (vty, "pce_path_scope: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  if (ntohl (pi->pce_scope.header.type) == 0 || scope != pi->pce_scope.value)
    {
      set_pce_path_scope (scope, pi);

      /* Refresh RI LSA if already engaged */
      if (OspfRI.flags & RIFLG_LSA_ENGAGED)
        ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);
    }

  return CMD_SUCCESS;
}

DEFUN (no_pce_path_scope,
       no_pce_path_scope_cmd,
       "no pce scope [BITPATTERN]",
       NO_STR
       PCE_STR
       "Disable PCE path scope\n"
       "32-bit Hexadecimal value\n")
{

  unset_param (&OspfRI.pce_info.pce_address.header);

  /* Refresh RI LSA if already engaged */
  if ((OspfRI.status == enabled) && (OspfRI.flags & RIFLG_LSA_ENGAGED))
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (pce_domain,
       pce_domain_cmd,
       "pce domain as (0-65535)",
       PCE_STR
       "Configure PCE domain AS number\n"
       "AS number where the PCE as visibilities for path computation\n"
       "AS number in decimal <0-65535>\n")
{
  int idx_number = 3;

  uint32_t as;
  struct ospf_pce_info *pce = &OspfRI.pce_info;
  struct listnode *node;
  struct ri_pce_subtlv_domain *domain;

  if (!ospf_ri_enabled (vty))
    return CMD_WARNING_CONFIG_FAILED;

  if (sscanf (argv[idx_number]->arg, "%d", &as) != 1)
    {
      vty_out (vty, "pce_domain: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  /* Check if the domain is not already in the domain list */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_domain, node, domain))
    {
      if (ntohl (domain->header.type) == 0 && as == domain->value)
        return CMD_SUCCESS;
    }

  /* Create new domain if not found */
  set_pce_domain (PCE_DOMAIN_TYPE_AS, as, pce);

  /* Refresh RI LSA if already engaged */
  if (OspfRI.flags & RIFLG_LSA_ENGAGED)
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (no_pce_domain,
       no_pce_domain_cmd,
       "no pce domain as (0-65535)",
       NO_STR
       PCE_STR
       "Disable PCE domain AS number\n"
       "AS number where the PCE as visibilities for path computation\n"
       "AS number in decimal <0-65535>\n")
{
  int idx_number = 4;

  uint32_t as;
  struct ospf_pce_info *pce = &OspfRI.pce_info;

  if (sscanf (argv[idx_number]->arg, "%d", &as) != 1)
    {
      vty_out (vty, "no_pce_domain: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  /* Unset corresponding PCE domain */
  unset_pce_domain (PCE_DOMAIN_TYPE_AS, as, pce);

  /* Refresh RI LSA if already engaged */
  if ((OspfRI.status == enabled) && (OspfRI.flags & RIFLG_LSA_ENGAGED))
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (pce_neigbhor,
       pce_neighbor_cmd,
       "pce neighbor as (0-65535)",
       PCE_STR
       "Configure PCE neighbor domain AS number\n"
       "AS number of PCE neighbors\n"
       "AS number in decimal <0-65535>\n")
{
  int idx_number = 3;

  uint32_t as;
  struct ospf_pce_info *pce = &OspfRI.pce_info;
  struct listnode *node;
  struct ri_pce_subtlv_neighbor *neighbor;

  if (!ospf_ri_enabled (vty))
    return CMD_WARNING_CONFIG_FAILED;

  if (sscanf (argv[idx_number]->arg, "%d", &as) != 1)
    {
      vty_out (vty, "pce_neighbor: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  /* Check if the domain is not already in the domain list */
  for (ALL_LIST_ELEMENTS_RO (pce->pce_neighbor, node, neighbor))
    {
      if (ntohl (neighbor->header.type) == 0 && as == neighbor->value)
        return CMD_SUCCESS;
    }

  /* Create new domain if not found */
  set_pce_neighbor (PCE_DOMAIN_TYPE_AS, as, pce);

  /* Refresh RI LSA if already engaged */
  if (OspfRI.flags & RIFLG_LSA_ENGAGED)
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (no_pce_neighbor,
       no_pce_neighbor_cmd,
       "no pce neighbor as (0-65535)",
       NO_STR
       PCE_STR
       "Disable PCE neighbor AS number\n"
       "AS number of PCE neighbor\n"
       "AS number in decimal <0-65535>\n")
{
  int idx_number = 4;

  uint32_t as;
  struct ospf_pce_info *pce = &OspfRI.pce_info;

  if (sscanf (argv[idx_number]->arg, "%d", &as) != 1)
    {
      vty_out (vty, "no_pce_neighbor: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  /* Unset corresponding PCE domain */
  unset_pce_neighbor (PCE_DOMAIN_TYPE_AS, as, pce);

  /* Refresh RI LSA if already engaged */
  if ((OspfRI.status == enabled) && (OspfRI.flags & RIFLG_LSA_ENGAGED))
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (pce_cap_flag,
       pce_cap_flag_cmd,
       "pce flag BITPATTERN",
       PCE_STR
       "Capabilities of the PCE for path computation\n"
       "32-bit Hexadecimal value\n")
{
  int idx_bitpattern = 2;

  uint32_t cap;
  struct ospf_pce_info *pce = &OspfRI.pce_info;

  if (!ospf_ri_enabled (vty))
    return CMD_WARNING_CONFIG_FAILED;

  if (sscanf (argv[idx_bitpattern]->arg, "0x%x", &cap) != 1)
    {
      vty_out (vty, "pce_cap_flag: fscanf: %s\n",safe_strerror(errno));
      return CMD_WARNING_CONFIG_FAILED;
    }

  if (ntohl (pce->pce_cap_flag.header.type) == 0
      || cap != pce->pce_cap_flag.value)
    {
      set_pce_cap_flag (cap, pce);

      /* Refresh RI LSA if already engaged */
      if (OspfRI.flags & RIFLG_LSA_ENGAGED)
        ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);
    }

  return CMD_SUCCESS;
}

DEFUN (no_pce_cap_flag,
       no_pce_cap_flag_cmd,
       "no pce flag",
       NO_STR
       PCE_STR
       "Disable PCE capabilities\n")
{

  unset_param (&OspfRI.pce_info.pce_cap_flag.header);

  /* Refresh RI LSA if already engaged */
  if ((OspfRI.status == enabled) && (OspfRI.flags & RIFLG_LSA_ENGAGED))
    ospf_router_info_lsa_schedule (REFRESH_THIS_LSA);

  return CMD_SUCCESS;
}

DEFUN (show_ip_ospf_router_info,
       show_ip_ospf_router_info_cmd,
       "show ip ospf router-info",
       SHOW_STR
       IP_STR
       OSPF_STR
       "Router Information\n")
{

  if (OspfRI.status == enabled)
    {
      vty_out (vty, "--- Router Information parameters ---\n");
      show_vty_router_cap (vty, &OspfRI.router_cap.header);
    }
  else
    {
      if (vty != NULL)
        vty_out (vty, "  Router Information is disabled on this router\n");
    }
  return CMD_SUCCESS;
}

DEFUN (show_ip_opsf_router_info_pce,
       show_ip_ospf_router_info_pce_cmd,
       "show ip ospf router-info pce",
       SHOW_STR
       IP_STR
       OSPF_STR
       "Router Information\n"
       "PCE information\n")
{

  struct ospf_pce_info *pce = &OspfRI.pce_info;
  struct listnode *node;
  struct ri_pce_subtlv_domain *domain;
  struct ri_pce_subtlv_neighbor *neighbor;

  if (OspfRI.status == enabled)
    {
      vty_out (vty, "--- PCE parameters ---\n");

      if (pce->pce_address.header.type != 0)
        show_vty_pce_subtlv_address (vty, &pce->pce_address.header);

      if (pce->pce_scope.header.type != 0)
        show_vty_pce_subtlv_path_scope (vty, &pce->pce_scope.header);

      for (ALL_LIST_ELEMENTS_RO (pce->pce_domain, node, domain))
        {
          if (domain->header.type != 0)
            show_vty_pce_subtlv_domain (vty, &domain->header);
        }

      for (ALL_LIST_ELEMENTS_RO (pce->pce_neighbor, node, neighbor))
        {
          if (neighbor->header.type != 0)
            show_vty_pce_subtlv_neighbor (vty, &neighbor->header);
        }

      if (pce->pce_cap_flag.header.type != 0)
        show_vty_pce_subtlv_cap_flag (vty, &pce->pce_cap_flag.header);

    }
  else
    {
      vty_out (vty,"  Router Information is disabled on this router\n");
    }

  return CMD_SUCCESS;
}

/* Install new CLI commands */
static void
ospf_router_info_register_vty (void)
{
  install_element (VIEW_NODE, &show_ip_ospf_router_info_cmd);
  install_element (VIEW_NODE, &show_ip_ospf_router_info_pce_cmd);

  install_element (OSPF_NODE, &router_info_area_cmd);
  install_element (OSPF_NODE, &no_router_info_cmd);
  install_element (OSPF_NODE, &pce_address_cmd);
  install_element (OSPF_NODE, &no_pce_address_cmd);
  install_element (OSPF_NODE, &pce_path_scope_cmd);
  install_element (OSPF_NODE, &no_pce_path_scope_cmd);
  install_element (OSPF_NODE, &pce_domain_cmd);
  install_element (OSPF_NODE, &no_pce_domain_cmd);
  install_element (OSPF_NODE, &pce_neighbor_cmd);
  install_element (OSPF_NODE, &no_pce_neighbor_cmd);
  install_element (OSPF_NODE, &pce_cap_flag_cmd);
  install_element (OSPF_NODE, &no_pce_cap_flag_cmd);

  return;
}