/src/frr/ospfd/ospf_zebra.c

Source
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Zebra connect library for OSPFd
 * Copyright (C) 1997, 98, 99, 2000 Kunihiro Ishiguro, Toshiaki Takada
 */

#include <zebra.h>

#include "frrevent.h"
#include "command.h"
#include "network.h"
#include "prefix.h"
#include "routemap.h"
#include "table.h"
#include "stream.h"
#include "memory.h"
#include "zclient.h"
#include "filter.h"
#include "plist.h"
#include "log.h"
#include "route_opaque.h"
#include "lib/bfd.h"
#include "lib/lib_errors.h"
#include "nexthop.h"

#include "ospfd/ospfd.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_ism.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_abr.h"
#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"
#include "ospfd/ospf_te.h"
#include "ospfd/ospf_sr.h"
#include "ospfd/ospf_ldp_sync.h"

DEFINE_MTYPE_STATIC(OSPFD, OSPF_EXTERNAL, "OSPF External route table");
DEFINE_MTYPE_STATIC(OSPFD, OSPF_REDISTRIBUTE, "OSPF Redistriute");


/* Zebra structure to hold current status. */
struct zclient *zclient = NULL;
/* and for the Synchronous connection to the Label Manager */
static struct zclient *zclient_sync;

/* For registering threads. */
extern struct event_loop *master;

/* Router-id update message from zebra. */
static int ospf_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
{
  struct ospf *ospf = NULL;
  struct prefix router_id;
  zebra_router_id_update_read(zclient->ibuf, &router_id);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
    zlog_debug("Zebra rcvd: router id update %pFX vrf %s id %u",
         &router_id, ospf_vrf_id_to_name(vrf_id), vrf_id);

  ospf = ospf_lookup_by_vrf_id(vrf_id);

  if (ospf != NULL) {
    ospf->router_id_zebra = router_id.u.prefix4;
    ospf_router_id_update(ospf);
  } else {
    if (IS_DEBUG_OSPF_EVENT)
      zlog_debug(
        "%s: ospf instance not found for vrf %s id %u router_id %pFX",
        __func__, ospf_vrf_id_to_name(vrf_id), vrf_id,
        &router_id);
  }
  return 0;
}

static int ospf_interface_address_add(ZAPI_CALLBACK_ARGS)
{
  struct connected *c;
  struct ospf *ospf = NULL;


  c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);

  if (c == NULL)
    return 0;

  if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
    zlog_debug("Zebra: interface %s address add %pFX vrf %s id %u",
         c->ifp->name, c->address,
         ospf_vrf_id_to_name(vrf_id), vrf_id);

  ospf = ospf_lookup_by_vrf_id(vrf_id);
  if (!ospf)
    return 0;

  ospf_if_update(ospf, c->ifp);

  ospf_if_interface(c->ifp);

  return 0;
}

static int ospf_interface_address_delete(ZAPI_CALLBACK_ARGS)
{
  struct connected *c;
  struct interface *ifp;
  struct ospf_interface *oi;
  struct route_node *rn;
  struct prefix p;

  c = zebra_interface_address_read(cmd, zclient->ibuf, vrf_id);

  if (c == NULL)
    return 0;

  if (IS_DEBUG_OSPF(zebra, ZEBRA_INTERFACE))
    zlog_debug("Zebra: interface %s address delete %pFX",
         c->ifp->name, c->address);

  ifp = c->ifp;
  p = *c->address;
  p.prefixlen = IPV4_MAX_BITLEN;

  rn = route_node_lookup(IF_OIFS(ifp), &p);
  if (!rn) {
    connected_free(&c);
    return 0;
  }

  assert(rn->info);
  oi = rn->info;
  route_unlock_node(rn);

  /* Call interface hook functions to clean up */
  ospf_if_free(oi);

  ospf_if_interface(c->ifp);

  connected_free(&c);

  return 0;
}

static int ospf_interface_link_params(ZAPI_CALLBACK_ARGS)
{
  struct interface *ifp;
  bool changed = false;

  ifp = zebra_interface_link_params_read(zclient->ibuf, vrf_id, &changed);

  if (ifp == NULL || !changed)
    return 0;

  /* Update TE TLV */
  ospf_mpls_te_update_if(ifp);

  return 0;
}

/* VRF update for an interface. */
static int ospf_interface_vrf_update(ZAPI_CALLBACK_ARGS)
{
  struct interface *ifp = NULL;
  vrf_id_t new_vrf_id;

  ifp = zebra_interface_vrf_update_read(zclient->ibuf, vrf_id,
                &new_vrf_id);
  if (!ifp)
    return 0;

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug(
      "%s: Rx Interface %s VRF change vrf_id %u New vrf %s id %u",
      __func__, ifp->name, vrf_id,
      ospf_vrf_id_to_name(new_vrf_id), new_vrf_id);

  /*if_update(ifp, ifp->name, strlen(ifp->name), new_vrf_id);*/
  if_update_to_new_vrf(ifp, new_vrf_id);

  return 0;
}

/* Nexthop, ifindex, distance and metric information. */
static void ospf_zebra_add_nexthop(struct ospf *ospf, struct ospf_path *path,
           struct zapi_route *api)
{
  struct zapi_nexthop *api_nh;
  struct zapi_nexthop *api_nh_backup;

  /* TI-LFA backup path label stack comes first, if present */
  if (path->srni.backup_label_stack) {
    api_nh_backup = &api->backup_nexthops[api->backup_nexthop_num];
    api_nh_backup->vrf_id = ospf->vrf_id;

    api_nh_backup->type = NEXTHOP_TYPE_IPV4;
    api_nh_backup->gate.ipv4 = path->srni.backup_nexthop;

    api_nh_backup->label_num =
      path->srni.backup_label_stack->num_labels;
    memcpy(api_nh_backup->labels,
           path->srni.backup_label_stack->label,
           sizeof(mpls_label_t) * api_nh_backup->label_num);

    api->backup_nexthop_num++;
  }

  /* And here comes the primary nexthop */
  api_nh = &api->nexthops[api->nexthop_num];
#ifdef HAVE_NETLINK
  if (path->unnumbered
      || (path->nexthop.s_addr != INADDR_ANY && path->ifindex != 0)) {
#else  /* HAVE_NETLINK */
  if (path->nexthop.s_addr != INADDR_ANY && path->ifindex != 0) {
#endif /* HAVE_NETLINK */
    api_nh->gate.ipv4 = path->nexthop;
    api_nh->ifindex = path->ifindex;
    api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
  } else if (path->nexthop.s_addr != INADDR_ANY) {
    api_nh->gate.ipv4 = path->nexthop;
    api_nh->type = NEXTHOP_TYPE_IPV4;
  } else {
    api_nh->ifindex = path->ifindex;
    api_nh->type = NEXTHOP_TYPE_IFINDEX;
  }
  api_nh->vrf_id = ospf->vrf_id;

  /* Set TI-LFA backup nexthop info if present */
  if (path->srni.backup_label_stack) {
    SET_FLAG(api->message, ZAPI_MESSAGE_BACKUP_NEXTHOPS);
    SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_HAS_BACKUP);

    /* Just care about a single TI-LFA backup path for now */
    api_nh->backup_num = 1;
    api_nh->backup_idx[0] = api->backup_nexthop_num - 1;
  }

  api->nexthop_num++;
}

static void ospf_zebra_append_opaque_attr(struct ospf_route *or,
            struct zapi_route *api)
{
  struct ospf_zebra_opaque ospf_opaque = {};

  /* OSPF path type */
  snprintf(ospf_opaque.path_type, sizeof(ospf_opaque.path_type), "%s",
     ospf_path_type_name(or->path_type));

  switch (or->path_type) {
  case OSPF_PATH_INTRA_AREA:
  case OSPF_PATH_INTER_AREA:
    /* OSPF area ID */
    (void)inet_ntop(AF_INET, &or->u.std.area_id,
        ospf_opaque.area_id,
        sizeof(ospf_opaque.area_id));
    break;
  case OSPF_PATH_TYPE1_EXTERNAL:
  case OSPF_PATH_TYPE2_EXTERNAL:
    /* OSPF route tag */
    snprintf(ospf_opaque.tag, sizeof(ospf_opaque.tag), "%u",
       or->u.ext.tag);
    break;
  default:
    break;
  }

  SET_FLAG(api->message, ZAPI_MESSAGE_OPAQUE);
  api->opaque.length = sizeof(struct ospf_zebra_opaque);
  memcpy(api->opaque.data, &ospf_opaque, api->opaque.length);
}

void ospf_zebra_add(struct ospf *ospf, struct prefix_ipv4 *p,
        struct ospf_route * or)
{
  struct zapi_route api;
  uint8_t distance;
  struct ospf_path *path;
  struct listnode *node;

  if (ospf->gr_info.restart_in_progress) {
    if (IS_DEBUG_OSPF_GR)
      zlog_debug(
        "Zebra: Graceful Restart in progress -- not installing %pFX",
        p);
    return;
  }

  memset(&api, 0, sizeof(api));
  api.vrf_id = ospf->vrf_id;
  api.type = ZEBRA_ROUTE_OSPF;
  api.instance = ospf->instance;
  api.safi = SAFI_UNICAST;

  memcpy(&api.prefix, p, sizeof(*p));
  SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);

  /* Metric value. */
  SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
  if (or->path_type == OSPF_PATH_TYPE1_EXTERNAL)
    api.metric = or->cost + or->u.ext.type2_cost;
  else if (or->path_type == OSPF_PATH_TYPE2_EXTERNAL)
    api.metric = or->u.ext.type2_cost;
  else
    api.metric = or->cost;

  /* Check if path type is ASE */
  if (((or->path_type == OSPF_PATH_TYPE1_EXTERNAL)
       || (or->path_type == OSPF_PATH_TYPE2_EXTERNAL))
      && (or->u.ext.tag > 0) && (or->u.ext.tag <= ROUTE_TAG_MAX)) {
    SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
    api.tag = or->u.ext.tag;
  }

  /* Distance value. */
  distance = ospf_distance_apply(ospf, p, or);
  if (distance) {
    SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
    api.distance = distance;
  }

  for (ALL_LIST_ELEMENTS_RO(or->paths, node, path)) {
    if (api.nexthop_num >= ospf->max_multipath)
      break;

    ospf_zebra_add_nexthop(ospf, path, &api);

    if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE)) {
      struct interface *ifp;

      ifp = if_lookup_by_index(path->ifindex, ospf->vrf_id);

      zlog_debug(
        "Zebra: Route add %pFX nexthop %pI4, ifindex=%d %s",
        p, &path->nexthop, path->ifindex,
        ifp ? ifp->name : " ");
    }
  }

  if (CHECK_FLAG(ospf->config, OSPF_SEND_EXTRA_DATA_TO_ZEBRA))
    ospf_zebra_append_opaque_attr(or, &api);

  zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
}

void ospf_zebra_delete(struct ospf *ospf, struct prefix_ipv4 *p,
           struct ospf_route * or)
{
  struct zapi_route api;

  if (ospf->gr_info.restart_in_progress) {
    if (IS_DEBUG_OSPF_GR)
      zlog_debug(
        "Zebra: Graceful Restart in progress -- not uninstalling %pFX",
        p);
    return;
  }

  memset(&api, 0, sizeof(api));
  api.vrf_id = ospf->vrf_id;
  api.type = ZEBRA_ROUTE_OSPF;
  api.instance = ospf->instance;
  api.safi = SAFI_UNICAST;
  memcpy(&api.prefix, p, sizeof(*p));

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug("Zebra: Route delete %pFX", p);

  zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
}

void ospf_zebra_add_discard(struct ospf *ospf, struct prefix_ipv4 *p)
{
  struct zapi_route api;

  if (ospf->gr_info.restart_in_progress) {
    if (IS_DEBUG_OSPF_GR)
      zlog_debug(
        "Zebra: Graceful Restart in progress -- not installing %pFX",
        p);
    return;
  }

  memset(&api, 0, sizeof(api));
  api.vrf_id = ospf->vrf_id;
  api.type = ZEBRA_ROUTE_OSPF;
  api.instance = ospf->instance;
  api.safi = SAFI_UNICAST;
  memcpy(&api.prefix, p, sizeof(*p));
  zapi_route_set_blackhole(&api, BLACKHOLE_NULL);

  zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug("Zebra: Route add discard %pFX", p);
}

void ospf_zebra_delete_discard(struct ospf *ospf, struct prefix_ipv4 *p)
{
  struct zapi_route api;

  if (ospf->gr_info.restart_in_progress) {
    if (IS_DEBUG_OSPF_GR)
      zlog_debug(
        "Zebra: Graceful Restart in progress -- not uninstalling %pFX",
        p);
    return;
  }

  memset(&api, 0, sizeof(api));
  api.vrf_id = ospf->vrf_id;
  api.type = ZEBRA_ROUTE_OSPF;
  api.instance = ospf->instance;
  api.safi = SAFI_UNICAST;
  memcpy(&api.prefix, p, sizeof(*p));
  zapi_route_set_blackhole(&api, BLACKHOLE_NULL);

  zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug("Zebra: Route delete discard %pFX", p);
}

struct ospf_external *ospf_external_lookup(struct ospf *ospf, uint8_t type,
             unsigned short instance)
{
  struct list *ext_list;
  struct listnode *node;
  struct ospf_external *ext;

  ext_list = ospf->external[type];
  if (!ext_list)
    return (NULL);

  for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext))
    if (ext->instance == instance)
      return ext;

  return NULL;
}

struct ospf_external *ospf_external_add(struct ospf *ospf, uint8_t type,
          unsigned short instance)
{
  struct list *ext_list;
  struct ospf_external *ext;

  ext = ospf_external_lookup(ospf, type, instance);
  if (ext)
    return ext;

  if (!ospf->external[type])
    ospf->external[type] = list_new();

  ext_list = ospf->external[type];
  ext = XCALLOC(MTYPE_OSPF_EXTERNAL, sizeof(struct ospf_external));
  ext->instance = instance;
  EXTERNAL_INFO(ext) = route_table_init();

  listnode_add(ext_list, ext);

  return ext;
}

/*
 * Walk all the ei received from zebra for a route type and apply
 * default route-map.
 */
bool ospf_external_default_routemap_apply_walk(struct ospf *ospf,
                 struct list *ext_list,
                 struct external_info *default_ei)
{
  struct listnode *node;
  struct ospf_external *ext;
  struct route_node *rn;
  struct external_info *ei = NULL;
  int ret = 0;

  for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
    if (!ext->external_info)
      continue;

    for (rn = route_top(ext->external_info); rn;
         rn = route_next(rn)) {
      ei = rn->info;
      if (!ei)
        continue;
      ret = ospf_external_info_apply_default_routemap(
        ospf, ei, default_ei);
      if (ret)
        break;
    }
  }

  if (ret && ei) {
    if (IS_DEBUG_OSPF_DEFAULT_INFO)
      zlog_debug("Default originate routemap permit ei: %pI4",
           &ei->p.prefix);
    return true;
  }

  return false;
}

/*
 * Function to originate or flush default after applying
 * route-map on all ei.
 */
static void ospf_external_lsa_default_routemap_timer(struct event *thread)
{
  struct list *ext_list;
  struct ospf *ospf = EVENT_ARG(thread);
  struct prefix_ipv4 p;
  int type;
  int ret = 0;
  struct ospf_lsa *lsa;
  struct external_info *default_ei;

  p.family = AF_INET;
  p.prefixlen = 0;
  p.prefix.s_addr = INADDR_ANY;

  /* Get the default extenal info. */
  default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE,
                 ospf->instance, &p);
  if (!default_ei) {
    /* Nothing to be done here. */
    if (IS_DEBUG_OSPF_DEFAULT_INFO)
      zlog_debug("Default originate info not present");
    return;
  }

  /* For all the ei apply route-map */
  for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
    ext_list = ospf->external[type];
    if (!ext_list || type == ZEBRA_ROUTE_OSPF)
      continue;

    ret = ospf_external_default_routemap_apply_walk(ospf, ext_list,
                default_ei);
    if (ret)
      break;
  }

  /* Get the default LSA. */
  lsa = ospf_external_info_find_lsa(ospf, &p);

  /* If permit then originate default. */
  if (ret && !lsa)
    ospf_external_lsa_originate(ospf, default_ei);
  else if (ret && lsa && IS_LSA_MAXAGE(lsa))
    ospf_external_lsa_refresh(ospf, lsa, default_ei, true, false);
  else if (!ret && lsa)
    ospf_external_lsa_flush(ospf, DEFAULT_ROUTE, &default_ei->p, 0);
}


void ospf_external_del(struct ospf *ospf, uint8_t type, unsigned short instance)
{
  struct ospf_external *ext;

  ext = ospf_external_lookup(ospf, type, instance);

  if (ext) {
    if (EXTERNAL_INFO(ext))
      route_table_finish(EXTERNAL_INFO(ext));

    listnode_delete(ospf->external[type], ext);

    if (!ospf->external[type]->count)
      list_delete(&ospf->external[type]);

    XFREE(MTYPE_OSPF_EXTERNAL, ext);
  }

  /*
   * Check if default needs to be flushed too.
   */
  event_add_event(master, ospf_external_lsa_default_routemap_timer, ospf,
      0, &ospf->t_default_routemap_timer);
}

/* Update NHLFE for Prefix SID */
void ospf_zebra_update_prefix_sid(const struct sr_prefix *srp)
{
  struct zapi_labels zl;
  struct zapi_nexthop *znh;
  struct zapi_nexthop *znh_backup;
  struct listnode *node;
  struct ospf_path *path;

  /* Prepare message. */
  memset(&zl, 0, sizeof(zl));
  zl.type = ZEBRA_LSP_OSPF_SR;
  zl.local_label = srp->label_in;

  switch (srp->type) {
  case LOCAL_SID:
    /* Set Label for local Prefix */
    znh = &zl.nexthops[zl.nexthop_num++];
    znh->type = NEXTHOP_TYPE_IFINDEX;
    znh->ifindex = srp->nhlfe.ifindex;
    znh->label_num = 1;
    znh->labels[0] = srp->nhlfe.label_out;

    osr_debug("SR (%s): Configure Prefix %pFX with labels %u/%u",
        __func__, (struct prefix *)&srp->prefv4,
        srp->label_in, srp->nhlfe.label_out);

    break;

  case PREF_SID:
    /* Update route in the RIB too. */
    SET_FLAG(zl.message, ZAPI_LABELS_FTN);
    zl.route.prefix.u.prefix4 = srp->prefv4.prefix;
    zl.route.prefix.prefixlen = srp->prefv4.prefixlen;
    zl.route.prefix.family = srp->prefv4.family;
    zl.route.type = ZEBRA_ROUTE_OSPF;
    zl.route.instance = 0;

    /* Check that SRP contains at least one valid path */
    if (srp->route == NULL) {
      return;
    }

    osr_debug("SR (%s): Configure Prefix %pFX with",
        __func__, (struct prefix *)&srp->prefv4);

    for (ALL_LIST_ELEMENTS_RO(srp->route->paths, node, path)) {
      if (path->srni.label_out == MPLS_INVALID_LABEL)
        continue;

      if (zl.nexthop_num >= MULTIPATH_NUM)
        break;

      /*
       * TI-LFA backup path label stack comes first, if
       * present.
       */
      if (path->srni.backup_label_stack) {
        znh_backup = &zl.backup_nexthops
                  [zl.backup_nexthop_num++];
        znh_backup->type = NEXTHOP_TYPE_IPV4;
        znh_backup->gate.ipv4 =
          path->srni.backup_nexthop;

        memcpy(znh_backup->labels,
               path->srni.backup_label_stack->label,
               sizeof(mpls_label_t)
                 * path->srni.backup_label_stack
               ->num_labels);

        znh_backup->label_num =
          path->srni.backup_label_stack
            ->num_labels;
        if (path->srni.label_out
              != MPLS_LABEL_IPV4_EXPLICIT_NULL
            && path->srni.label_out
                 != MPLS_LABEL_IMPLICIT_NULL)
          znh_backup->labels
            [znh_backup->label_num++] =
            path->srni.label_out;
      }

      znh = &zl.nexthops[zl.nexthop_num++];
      znh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
      znh->gate.ipv4 = path->nexthop;
      znh->ifindex = path->ifindex;
      znh->label_num = 1;
      znh->labels[0] = path->srni.label_out;

      osr_debug("  |- labels %u/%u", srp->label_in,
          path->srni.label_out);

      /* Set TI-LFA backup nexthop info if present */
      if (path->srni.backup_label_stack) {
        SET_FLAG(zl.message, ZAPI_LABELS_HAS_BACKUPS);
        SET_FLAG(znh->flags,
           ZAPI_NEXTHOP_FLAG_HAS_BACKUP);

        /* Just care about a single TI-LFA backup path
         * for now */
        znh->backup_num = 1;
        znh->backup_idx[0] = zl.backup_nexthop_num - 1;
      }
    }
    break;
  case ADJ_SID:
  case LAN_ADJ_SID:
    return;
  }

  /* Finally, send message to zebra. */
  (void)zebra_send_mpls_labels(zclient, ZEBRA_MPLS_LABELS_REPLACE, &zl);
}

/* Remove NHLFE for Prefix-SID */
void ospf_zebra_delete_prefix_sid(const struct sr_prefix *srp)
{
  struct zapi_labels zl;

  osr_debug("SR (%s): Delete Labels %u for Prefix %pFX", __func__,
      srp->label_in, (struct prefix *)&srp->prefv4);

  /* Prepare message. */
  memset(&zl, 0, sizeof(zl));
  zl.type = ZEBRA_LSP_OSPF_SR;
  zl.local_label = srp->label_in;

  if (srp->type == PREF_SID) {
    /* Update route in the RIB too */
    SET_FLAG(zl.message, ZAPI_LABELS_FTN);
    zl.route.prefix.u.prefix4 = srp->prefv4.prefix;
    zl.route.prefix.prefixlen = srp->prefv4.prefixlen;
    zl.route.prefix.family = srp->prefv4.family;
    zl.route.type = ZEBRA_ROUTE_OSPF;
    zl.route.instance = 0;
  }

  /* Send message to zebra. */
  (void)zebra_send_mpls_labels(zclient, ZEBRA_MPLS_LABELS_DELETE, &zl);
}

/* Send MPLS Label entry to Zebra for installation or deletion */
void ospf_zebra_send_adjacency_sid(int cmd, struct sr_nhlfe nhlfe)
{
  struct zapi_labels zl;
  struct zapi_nexthop *znh;

  osr_debug("SR (%s): %s Labels %u/%u for Adjacency via %u", __func__,
      cmd == ZEBRA_MPLS_LABELS_ADD ? "Add" : "Delete",
      nhlfe.label_in, nhlfe.label_out, nhlfe.ifindex);

  memset(&zl, 0, sizeof(zl));
  zl.type = ZEBRA_LSP_OSPF_SR;
  zl.local_label = nhlfe.label_in;
  zl.nexthop_num = 1;
  znh = &zl.nexthops[0];
  znh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
  znh->gate.ipv4 = nhlfe.nexthop;
  znh->ifindex = nhlfe.ifindex;
  znh->label_num = 1;
  znh->labels[0] = nhlfe.label_out;

  (void)zebra_send_mpls_labels(zclient, cmd, &zl);
}

struct ospf_redist *ospf_redist_lookup(struct ospf *ospf, uint8_t type,
               unsigned short instance)
{
  struct list *red_list;
  struct listnode *node;
  struct ospf_redist *red;

  red_list = ospf->redist[type];
  if (!red_list)
    return (NULL);

  for (ALL_LIST_ELEMENTS_RO(red_list, node, red))
    if (red->instance == instance)
      return red;

  return NULL;
}

struct ospf_redist *ospf_redist_add(struct ospf *ospf, uint8_t type,
            unsigned short instance)
{
  struct list *red_list;
  struct ospf_redist *red;

  red = ospf_redist_lookup(ospf, type, instance);
  if (red)
    return red;

  if (!ospf->redist[type])
    ospf->redist[type] = list_new();

  red_list = ospf->redist[type];
  red = XCALLOC(MTYPE_OSPF_REDISTRIBUTE, sizeof(struct ospf_redist));
  red->instance = instance;
  red->dmetric.type = -1;
  red->dmetric.value = -1;
  ROUTEMAP_NAME(red) = NULL;
  ROUTEMAP(red) = NULL;

  listnode_add(red_list, red);

  return red;
}

void ospf_redist_del(struct ospf *ospf, uint8_t type, unsigned short instance)
{
  struct ospf_redist *red;

  red = ospf_redist_lookup(ospf, type, instance);

  if (red) {
    listnode_delete(ospf->redist[type], red);
    if (!ospf->redist[type]->count) {
      list_delete(&ospf->redist[type]);
    }
    ospf_routemap_unset(red);
    XFREE(MTYPE_OSPF_REDISTRIBUTE, red);
  }
}


int ospf_is_type_redistributed(struct ospf *ospf, int type,
             unsigned short instance)
{
  return (DEFAULT_ROUTE_TYPE(type)
      ? vrf_bitmap_check(zclient->default_information[AFI_IP],
             ospf->vrf_id)
      : ((instance
          && redist_check_instance(
            &zclient->mi_redist[AFI_IP][type],
            instance))
         || (!instance
             && vrf_bitmap_check(
               zclient->redist[AFI_IP][type],
               ospf->vrf_id))));
}

int ospf_redistribute_update(struct ospf *ospf, struct ospf_redist *red,
           int type, unsigned short instance, int mtype,
           int mvalue)
{
  int force = 0;

  if (mtype != red->dmetric.type) {
    red->dmetric.type = mtype;
    force = LSA_REFRESH_FORCE;
  }
  if (mvalue != red->dmetric.value) {
    red->dmetric.value = mvalue;
    force = LSA_REFRESH_FORCE;
  }

  ospf_external_lsa_refresh_type(ospf, type, instance, force);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug(
      "Redistribute[%s][%d]: Refresh  Type[%d], Metric[%d]",
      ospf_redist_string(type), instance,
      metric_type(ospf, type, instance),
      metric_value(ospf, type, instance));

  return CMD_SUCCESS;
}

int ospf_redistribute_set(struct ospf *ospf, struct ospf_redist *red, int type,
        unsigned short instance, int mtype, int mvalue)
{
  red->dmetric.type = mtype;
  red->dmetric.value = mvalue;

  ospf_external_add(ospf, type, instance);

  zclient_redistribute(ZEBRA_REDISTRIBUTE_ADD, zclient, AFI_IP, type,
           instance, ospf->vrf_id);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug(
      "Redistribute[%s][%d] vrf id %u: Start  Type[%d], Metric[%d]",
      ospf_redist_string(type), instance, ospf->vrf_id,
      metric_type(ospf, type, instance),
      metric_value(ospf, type, instance));

  ospf_asbr_status_update(ospf, ++ospf->redistribute);

  return CMD_SUCCESS;
}

int ospf_redistribute_unset(struct ospf *ospf, int type,
          unsigned short instance)
{
  if (type == zclient->redist_default && instance == zclient->instance)
    return CMD_SUCCESS;

  zclient_redistribute(ZEBRA_REDISTRIBUTE_DELETE, zclient, AFI_IP, type,
           instance, ospf->vrf_id);

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug("Redistribute[%s][%d] vrf id %u: Stop",
         ospf_redist_string(type), instance, ospf->vrf_id);

  /* Remove the routes from OSPF table. */
  ospf_redistribute_withdraw(ospf, type, instance);

  ospf_external_del(ospf, type, instance);

  ospf_asbr_status_update(ospf, --ospf->redistribute);

  return CMD_SUCCESS;
}

int ospf_redistribute_default_set(struct ospf *ospf, int originate, int mtype,
          int mvalue)
{
  struct prefix_ipv4 p;
  struct in_addr nexthop;
  int cur_originate = ospf->default_originate;
  const char *type_str = NULL;

  nexthop.s_addr = INADDR_ANY;
  p.family = AF_INET;
  p.prefix.s_addr = INADDR_ANY;
  p.prefixlen = 0;

  ospf->default_originate = originate;

  if (cur_originate == originate) {
    /* Refresh the lsa since metric might different */
    if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
      zlog_debug(
        "Redistribute[%s]: Refresh  Type[%d], Metric[%d]",
        ospf_redist_string(DEFAULT_ROUTE),
        metric_type(ospf, DEFAULT_ROUTE, 0),
        metric_value(ospf, DEFAULT_ROUTE, 0));

    ospf_external_lsa_refresh_default(ospf);
    return CMD_SUCCESS;
  }

  switch (cur_originate) {
  case DEFAULT_ORIGINATE_NONE:
    break;
  case DEFAULT_ORIGINATE_ZEBRA:
    zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE,
         zclient, AFI_IP, ospf->vrf_id);
    ospf->redistribute--;
    break;
  case DEFAULT_ORIGINATE_ALWAYS:
    ospf_external_info_delete(ospf, DEFAULT_ROUTE, 0, p);
    ospf_external_del(ospf, DEFAULT_ROUTE, 0);
    ospf->redistribute--;
    break;
  }

  switch (originate) {
  case DEFAULT_ORIGINATE_NONE:
    type_str = "none";
    break;
  case DEFAULT_ORIGINATE_ZEBRA:
    type_str = "normal";
    ospf->redistribute++;
    zclient_redistribute_default(ZEBRA_REDISTRIBUTE_DEFAULT_ADD,
               zclient, AFI_IP, ospf->vrf_id);
    break;
  case DEFAULT_ORIGINATE_ALWAYS:
    type_str = "always";
    ospf->redistribute++;
    ospf_external_add(ospf, DEFAULT_ROUTE, 0);
    ospf_external_info_add(ospf, DEFAULT_ROUTE, 0, p, 0, nexthop, 0,
               DEFAULT_DEFAULT_METRIC);
    break;
  }

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug("Redistribute[DEFAULT]: %s Type[%d], Metric[%d]",
    type_str,
    metric_type(ospf, DEFAULT_ROUTE, 0),
    metric_value(ospf, DEFAULT_ROUTE, 0));

  ospf_external_lsa_refresh_default(ospf);
  ospf_asbr_status_update(ospf, ospf->redistribute);
  return CMD_SUCCESS;
}

static int ospf_external_lsa_originate_check(struct ospf *ospf,
               struct external_info *ei)
{
  /* If prefix is multicast, then do not originate LSA. */
  if (IN_MULTICAST(htonl(ei->p.prefix.s_addr))) {
    zlog_info(
      "LSA[Type5:%pI4]: Not originate AS-external-LSA, Prefix belongs multicast",
      &ei->p.prefix);
    return 0;
  }

  /* Take care of default-originate. */
  if (is_default_prefix4(&ei->p))
    if (ospf->default_originate == DEFAULT_ORIGINATE_NONE) {
      zlog_info(
        "LSA[Type5:0.0.0.0]: Not originate AS-external-LSA for default");
      return 0;
    }

  return 1;
}

/* If connected prefix is OSPF enable interface, then do not announce. */
int ospf_distribute_check_connected(struct ospf *ospf, struct external_info *ei)
{
  struct listnode *node;
  struct ospf_interface *oi;


  for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi))
    if (prefix_match(oi->address, (struct prefix *)&ei->p))
      return 0;
  return 1;
}


/* Apply default route-map on ei received. */
int ospf_external_info_apply_default_routemap(struct ospf *ospf,
                struct external_info *ei,
                struct external_info *default_ei)
{
  struct ospf_redist *red;
  int type = default_ei->type;
  struct prefix_ipv4 *p = &ei->p;
  struct route_map_set_values save_values;


  if (!ospf_external_lsa_originate_check(ospf, default_ei))
    return 0;

  save_values = default_ei->route_map_set;
  ospf_reset_route_map_set_values(&default_ei->route_map_set);

  /* apply route-map if needed */
  red = ospf_redist_lookup(ospf, type, ospf->instance);
  if (red && ROUTEMAP_NAME(red)) {
    route_map_result_t ret;

    ret = route_map_apply(ROUTEMAP(red), (struct prefix *)p, ei);

    if (ret == RMAP_DENYMATCH) {
      ei->route_map_set = save_values;
      return 0;
    }
  }

  return 1;
}


/*
 * Default originated is based on route-map condition then
 * apply route-map on received external info. Originate or
 * flush based on route-map condition.
 */
static bool ospf_external_lsa_default_routemap_apply(struct ospf *ospf,
                 struct external_info *ei,
                 int cmd)
{
  struct external_info *default_ei;
  struct prefix_ipv4 p;
  struct ospf_lsa *lsa;
  int ret;

  p.family = AF_INET;
  p.prefixlen = 0;
  p.prefix.s_addr = INADDR_ANY;


  /* Get the default extenal info. */
  default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE,
                 ospf->instance, &p);
  if (!default_ei) {
    /* Nothing to be done here. */
    return false;
  }

  if (IS_DEBUG_OSPF_DEFAULT_INFO)
    zlog_debug("Apply default originate routemap on ei: %pI4 cmd: %d",
         &ei->p.prefix, cmd);

  ret = ospf_external_info_apply_default_routemap(ospf, ei, default_ei);

  /* If deny then nothing to be done both in add and del case. */
  if (!ret) {
    if (IS_DEBUG_OSPF_DEFAULT_INFO)
      zlog_debug("Default originte routemap deny for ei: %pI4",
           &ei->p.prefix);
    return false;
  }

  /* Get the default LSA. */
  lsa = ospf_external_info_find_lsa(ospf, &p);

  /* If this is add route and permit then ooriginate default. */
  if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
    /* If permit and default already advertise then return. */
    if (lsa && !IS_LSA_MAXAGE(lsa)) {
      if (IS_DEBUG_OSPF_DEFAULT_INFO)
        zlog_debug("Default lsa already originated");
      return true;
    }

    if (IS_DEBUG_OSPF_DEFAULT_INFO)
      zlog_debug("Originating/Refreshing default lsa");

    if (lsa && IS_LSA_MAXAGE(lsa))
      /* Refresh lsa.*/
      ospf_external_lsa_refresh(ospf, lsa, default_ei, true,
              false);
    else
      /* If permit and default not advertised then advertise.
       */
      ospf_external_lsa_originate(ospf, default_ei);

  } else if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) {
    /* If deny and lsa is not originated then nothing to be done.*/
    if (!lsa) {
      if (IS_DEBUG_OSPF_DEFAULT_INFO)
        zlog_debug(
          "Default lsa not originated, not flushing");
      return true;
    }

    if (IS_DEBUG_OSPF_DEFAULT_INFO)
      zlog_debug(
        "Running default route-map again as ei: %pI4 deleted",
        &ei->p.prefix);
    /*
     * if this route delete was permitted then we need to check
     * there are any other external info which can still trigger
     * default route origination else flush it.
     */
    event_add_event(master,
        ospf_external_lsa_default_routemap_timer, ospf,
        0, &ospf->t_default_routemap_timer);
  }

  return true;
}

/* return 1 if external LSA must be originated, 0 otherwise */
int ospf_redistribute_check(struct ospf *ospf, struct external_info *ei,
          int *changed)
{
  struct route_map_set_values save_values;
  struct prefix_ipv4 *p = &ei->p;
  struct ospf_redist *red;
  uint8_t type = is_default_prefix4(&ei->p) ? DEFAULT_ROUTE : ei->type;
  unsigned short instance = is_default_prefix4(&ei->p) ? 0 : ei->instance;
  route_tag_t saved_tag = 0;

  /* Default is handled differently. */
  if (type == DEFAULT_ROUTE)
    return 1;

  if (changed)
    *changed = 0;

  if (!ospf_external_lsa_originate_check(ospf, ei))
    return 0;

  /* Take care connected route. */
  if (type == ZEBRA_ROUTE_CONNECT
      && !ospf_distribute_check_connected(ospf, ei))
    return 0;

  if (!DEFAULT_ROUTE_TYPE(type) && DISTRIBUTE_NAME(ospf, type))
    /* distirbute-list exists, but access-list may not? */
    if (DISTRIBUTE_LIST(ospf, type))
      if (access_list_apply(DISTRIBUTE_LIST(ospf, type), p)
          == FILTER_DENY) {
        if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
          zlog_debug(
            "Redistribute[%s]: %pFX filtered by distribute-list.",
            ospf_redist_string(type), p);
        return 0;
      }

  save_values = ei->route_map_set;
  ospf_reset_route_map_set_values(&ei->route_map_set);

  saved_tag = ei->tag;
  /* Resetting with original route tag */
  ei->tag = ei->orig_tag;

  /* apply route-map if needed */
  red = ospf_redist_lookup(ospf, type, instance);
  if (red && ROUTEMAP_NAME(red)) {
    route_map_result_t ret;

    ret = route_map_apply(ROUTEMAP(red), (struct prefix *)p, ei);

    if (ret == RMAP_DENYMATCH) {
      ei->route_map_set = save_values;
      if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
        zlog_debug(
          "Redistribute[%s]: %pFX filtered by route-map.",
          ospf_redist_string(type), p);
      return 0;
    }

    /* check if 'route-map set' changed something */
    if (changed) {
      *changed = !ospf_route_map_set_compare(
        &ei->route_map_set, &save_values);

      /* check if tag is modified */
      *changed |= (saved_tag != ei->tag);
    }
  }

  return 1;
}

/* OSPF route-map set for redistribution */
void ospf_routemap_set(struct ospf_redist *red, const char *name)
{
  if (ROUTEMAP_NAME(red)) {
    route_map_counter_decrement(ROUTEMAP(red));
    free(ROUTEMAP_NAME(red));
  }

  ROUTEMAP_NAME(red) = strdup(name);
  ROUTEMAP(red) = route_map_lookup_by_name(name);
  route_map_counter_increment(ROUTEMAP(red));
}

void ospf_routemap_unset(struct ospf_redist *red)
{
  if (ROUTEMAP_NAME(red)) {
    route_map_counter_decrement(ROUTEMAP(red));
    free(ROUTEMAP_NAME(red));
  }

  ROUTEMAP_NAME(red) = NULL;
  ROUTEMAP(red) = NULL;
}

static int ospf_zebra_gr_update(struct ospf *ospf, int command,
        uint32_t stale_time)
{
  struct zapi_cap api;

  if (!zclient || zclient->sock < 0 || !ospf)
    return 1;

  memset(&api, 0, sizeof(api));
  api.cap = command;
  api.stale_removal_time = stale_time;
  api.vrf_id = ospf->vrf_id;

  (void)zclient_capabilities_send(ZEBRA_CLIENT_CAPABILITIES, zclient,
          &api);

  return 0;
}

int ospf_zebra_gr_enable(struct ospf *ospf, uint32_t stale_time)
{
  if (IS_DEBUG_OSPF_GR)
    zlog_debug("Zebra enable GR [stale time %u]", stale_time);

  return ospf_zebra_gr_update(ospf, ZEBRA_CLIENT_GR_CAPABILITIES,
            stale_time);
}

int ospf_zebra_gr_disable(struct ospf *ospf)
{
  if (IS_DEBUG_OSPF_GR)
    zlog_debug("Zebra disable GR");

  return ospf_zebra_gr_update(ospf, ZEBRA_CLIENT_GR_DISABLE, 0);
}

/* Zebra route add and delete treatment. */
static int ospf_zebra_read_route(ZAPI_CALLBACK_ARGS)
{
  struct zapi_route api;
  struct prefix_ipv4 p;
  struct prefix pgen;
  unsigned long ifindex;
  struct in_addr nexthop;
  struct external_info *ei;
  struct ospf *ospf;
  int i;
  uint8_t rt_type;

  ospf = ospf_lookup_by_vrf_id(vrf_id);
  if (ospf == NULL)
    return 0;

  if (zapi_route_decode(zclient->ibuf, &api) < 0)
    return -1;

  ifindex = api.nexthops[0].ifindex;
  nexthop = api.nexthops[0].gate.ipv4;
  rt_type = api.type;

  memcpy(&p, &api.prefix, sizeof(p));
  if (IPV4_NET127(ntohl(p.prefix.s_addr)))
    return 0;

  pgen.family = p.family;
  pgen.prefixlen = p.prefixlen;
  pgen.u.prefix4 = p.prefix;

  /* Re-destributed route is default route.
   * Here, route type is used as 'ZEBRA_ROUTE_KERNEL' for
   * updating ex-info. But in resetting (no default-info
   * originate)ZEBRA_ROUTE_MAX is used to delete the ex-info.
   * Resolved this inconsistency by maintaining same route type.
   */
  if ((is_default_prefix(&pgen)) && (api.type != ZEBRA_ROUTE_OSPF))
    rt_type = DEFAULT_ROUTE;

  if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
    zlog_debug(
      "%s: cmd %s from client %s: vrf_id %d, p %pFX, metric %d",
      __func__, zserv_command_string(cmd),
      zebra_route_string(api.type), vrf_id, &api.prefix,
      api.metric);

  if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
    /* XXX|HACK|TODO|FIXME:
     * Maybe we should ignore reject/blackhole routes? Testing
     * shows that there is no problems though and this is only way
     * to "summarize" routes in ASBR at the moment. Maybe we need
     * just a better generalised solution for these types?
     */

    /* Protocol tag overwrites all other tag value sent by zebra */
    if (ospf->dtag[rt_type] > 0)
      api.tag = ospf->dtag[rt_type];

    /*
     * Given zebra sends update for a prefix via ADD message, it
     * should
     * be considered as an implicit DEL for that prefix with other
     * source
     * types.
     */
    for (i = 0; i <= ZEBRA_ROUTE_MAX; i++)
      if (i != rt_type)
        ospf_external_info_delete(ospf, i, api.instance,
                p);

    ei = ospf_external_info_add(ospf, rt_type, api.instance, p,
              ifindex, nexthop, api.tag,
              api.metric);
    if (ei == NULL) {
      /* Nothing has changed, so nothing to do; return */
      return 0;
    }
    if (ospf->router_id.s_addr != INADDR_ANY) {
      if (is_default_prefix4(&p))
        ospf_external_lsa_refresh_default(ospf);
      else {
        struct ospf_external_aggr_rt *aggr;
        struct as_external_lsa *al;
        struct ospf_lsa *lsa = NULL;
        struct in_addr mask;

        aggr = ospf_external_aggr_match(ospf, &ei->p);

        if (aggr) {
          /* Check the AS-external-LSA
           * should be originated.
           */
          if (!ospf_redistribute_check(ospf, ei,
                     NULL))
            return 0;

          if (IS_DEBUG_OSPF(lsa, EXTNL_LSA_AGGR))
            zlog_debug(
              "%s: Send Aggreate LSA (%pI4/%d)",
              __func__,
              &aggr->p.prefix,
              aggr->p.prefixlen);

          ospf_originate_summary_lsa(ospf, aggr,
                   ei);

          /* Handling the case where the
           * external route prefix
           * and aggegate prefix is same
           * If same don't flush the
           * originated
           * external LSA.
           */
          if (prefix_same(
                (struct prefix *)&aggr->p,
                (struct prefix *)&ei->p))
            return 0;

          lsa = ospf_external_info_find_lsa(
            ospf, &ei->p);

          if (lsa) {
            al = (struct as_external_lsa *)
                   lsa->data;
            masklen2ip(ei->p.prefixlen,
                 &mask);

            if (mask.s_addr
                != al->mask.s_addr)
              return 0;

            ospf_external_lsa_flush(
              ospf, ei->type, &ei->p,
              0);
          }
        } else {
          struct ospf_lsa *current;

          current = ospf_external_info_find_lsa(
            ospf, &ei->p);
          if (!current) {
            /* Check the
             * AS-external-LSA
             * should be
             * originated.
             */
            if (!ospf_redistribute_check(
                  ospf, ei, NULL))
              return 0;

            ospf_external_lsa_originate(
              ospf, ei);
          } else {
            if (IS_DEBUG_OSPF(
                  zebra,
                  ZEBRA_REDISTRIBUTE))
              zlog_debug(
                "%s: %pI4 refreshing LSA",
                __func__,
                &p.prefix);
            ospf_external_lsa_refresh(
              ospf, current, ei,
              LSA_REFRESH_FORCE,
              false);
          }
        }
      }
    }

    /*
     * Check if default-information originate is
     * with some routemap prefix/access list match.
     */
    ospf_external_lsa_default_routemap_apply(ospf, ei, cmd);

  } else { /* if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_DEL) */
    struct ospf_external_aggr_rt *aggr;

    ei = ospf_external_info_lookup(ospf, rt_type, api.instance, &p);
    if (ei == NULL)
      return 0;

    /*
     * Check if default-information originate i
     * with some routemap prefix/access list match.
     * Apply before ei is deleted.
     */
    ospf_external_lsa_default_routemap_apply(ospf, ei, cmd);

    aggr = ospf_external_aggr_match(ospf, &ei->p);

    if (aggr && (ei->aggr_route == aggr)) {
      ospf_unlink_ei_from_aggr(ospf, aggr, ei);

      ospf_external_info_delete(ospf, rt_type, api.instance,
              p);
    } else {
      ospf_external_info_delete(ospf, rt_type, api.instance,
              p);

      if (is_default_prefix4(&p))
        ospf_external_lsa_refresh_default(ospf);
      else
        ospf_external_lsa_flush(ospf, rt_type, &p,
              ifindex /*, nexthop */);
    }
  }

  return 0;
}

void ospf_zebra_import_default_route(struct ospf *ospf, bool unreg)
{
  struct prefix prefix = {};
  int command;

  if (zclient->sock < 0) {
    if (IS_DEBUG_OSPF(zebra, ZEBRA))
      zlog_debug("  Not connected to Zebra");
    return;
  }

  prefix.family = AF_INET;
  prefix.prefixlen = 0;

  if (unreg)
    command = ZEBRA_NEXTHOP_UNREGISTER;
  else
    command = ZEBRA_NEXTHOP_REGISTER;

  if (IS_DEBUG_OSPF(zebra, ZEBRA))
    zlog_debug("%s: sending cmd %s for %pFX (vrf %u)", __func__,
         zserv_command_string(command), &prefix,
         ospf->vrf_id);

  if (zclient_send_rnh(zclient, command, &prefix, SAFI_UNICAST, false,
           true, ospf->vrf_id) == ZCLIENT_SEND_FAILURE)
    flog_err(EC_LIB_ZAPI_SOCKET, "%s: zclient_send_rnh() failed",
       __func__);
}

static int ospf_zebra_import_check_update(ZAPI_CALLBACK_ARGS)
{
  struct ospf *ospf;
  struct zapi_route nhr;
  struct prefix matched;

  ospf = ospf_lookup_by_vrf_id(vrf_id);
  if (ospf == NULL || !IS_OSPF_ASBR(ospf))
    return 0;

  if (!zapi_nexthop_update_decode(zclient->ibuf, &matched, &nhr)) {
    zlog_err("%s[%u]: Failure to decode route", __func__,
       ospf->vrf_id);
    return -1;
  }

  if (matched.family != AF_INET || matched.prefixlen != 0 ||
      nhr.type == ZEBRA_ROUTE_OSPF)
    return 0;

  ospf->nssa_default_import_check.status = !!nhr.nexthop_num;
  ospf_abr_nssa_type7_defaults(ospf);

  return 0;
}

int ospf_distribute_list_out_set(struct ospf *ospf, int type, const char *name)
{
  /* Lookup access-list for distribute-list. */
  DISTRIBUTE_LIST(ospf, type) = access_list_lookup(AFI_IP, name);

  /* Clear previous distribute-name. */
  if (DISTRIBUTE_NAME(ospf, type))
    free(DISTRIBUTE_NAME(ospf, type));

  /* Set distribute-name. */
  DISTRIBUTE_NAME(ospf, type) = strdup(name);

  /* If access-list have been set, schedule update timer. */
  if (DISTRIBUTE_LIST(ospf, type))
    ospf_distribute_list_update(ospf, type, 0);

  return CMD_SUCCESS;
}

int ospf_distribute_list_out_unset(struct ospf *ospf, int type,
           const char *name)
{
  /* Schedule update timer. */
  if (DISTRIBUTE_LIST(ospf, type))
    ospf_distribute_list_update(ospf, type, 0);

  /* Unset distribute-list. */
  DISTRIBUTE_LIST(ospf, type) = NULL;

  /* Clear distribute-name. */
  if (DISTRIBUTE_NAME(ospf, type))
    free(DISTRIBUTE_NAME(ospf, type));

  DISTRIBUTE_NAME(ospf, type) = NULL;

  return CMD_SUCCESS;
}

/* distribute-list update timer. */
static void ospf_distribute_list_update_timer(struct event *thread)
{
  struct route_node *rn;
  struct external_info *ei;
  struct route_table *rt;
  struct ospf_lsa *lsa;
  int type, default_refresh = 0;
  struct ospf *ospf = EVENT_ARG(thread);

  if (ospf == NULL)
    return;

  ospf->t_distribute_update = NULL;

  zlog_info("Zebra[Redistribute]: distribute-list update timer fired!");

  if (IS_DEBUG_OSPF_EVENT) {
    zlog_debug("%s: ospf distribute-list update vrf %s id %d",
         __func__, ospf_vrf_id_to_name(ospf->vrf_id),
         ospf->vrf_id);
  }

  /* foreach all external info. */
  for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
    struct list *ext_list;
    struct listnode *node;
    struct ospf_external *ext;

    ext_list = ospf->external[type];
    if (!ext_list)
      continue;

    for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
      rt = ext->external_info;
      if (!rt)
        continue;
      for (rn = route_top(rt); rn; rn = route_next(rn)) {
        ei = rn->info;
        if (!ei)
          continue;

        if (is_default_prefix4(&ei->p))
          default_refresh = 1;
        else {
          struct ospf_external_aggr_rt *aggr;

          aggr = ospf_external_aggr_match(ospf,
                  &ei->p);
          if (aggr) {
            /* Check the
             * AS-external-LSA
             * should be originated.
             */
            if (!ospf_redistribute_check(
                  ospf, ei, NULL)) {

              ospf_unlink_ei_from_aggr(
                ospf, aggr, ei);
              continue;
            }

            if (IS_DEBUG_OSPF(
                  lsa,
                  EXTNL_LSA_AGGR))
              zlog_debug(
                "%s: Send Aggregate LSA (%pI4/%d)",
                __func__,
                &aggr->p.prefix,
                aggr->p.prefixlen);

            /* Originate Aggregate
             * LSA
             */
            ospf_originate_summary_lsa(
              ospf, aggr, ei);
          } else if (
            (lsa = ospf_external_info_find_lsa(
               ospf, &ei->p))) {
            int force =
              LSA_REFRESH_IF_CHANGED;
            /* If this is a MaxAge
             * LSA, we need to
             * force refresh it
             * because distribute
             * settings might have
             * changed and now,
             * this LSA needs to be
             * originated, not be
             * removed.
             * If we don't force
             * refresh it, it will
             * remain a MaxAge LSA
             * because it will look
             * like it hasn't
             * changed. Neighbors
             * will not receive
             * updates for this LSA.
             */
            if (IS_LSA_MAXAGE(lsa))
              force = LSA_REFRESH_FORCE;

            ospf_external_lsa_refresh(
              ospf, lsa, ei, force,
              false);
          } else {
            if (!ospf_redistribute_check(
                  ospf, ei, NULL))
              continue;
            ospf_external_lsa_originate(
              ospf, ei);
          }
        }
      }
    }
  }
  if (default_refresh)
    ospf_external_lsa_refresh_default(ospf);
}

/* Update distribute-list and set timer to apply access-list. */
void ospf_distribute_list_update(struct ospf *ospf, int type,
         unsigned short instance)
{
  struct ospf_external *ext;

  /* External info does not exist. */
  ext = ospf_external_lookup(ospf, type, instance);
  if (!ext || !EXTERNAL_INFO(ext))
    return;

  /* Set timer. If timer is already started, this call does nothing. */
  event_add_timer_msec(master, ospf_distribute_list_update_timer, ospf,
           ospf->min_ls_interval, &ospf->t_distribute_update);
}

/* If access-list is updated, apply some check. */
static void ospf_filter_update(struct access_list *access)
{
  struct ospf *ospf;
  int type;
  int abr_inv = 0;
  struct ospf_area *area;
  struct listnode *node, *n1;

  /* If OSPF instance does not exist, return right now. */
  if (listcount(om->ospf) == 0)
    return;

  /* Iterate all ospf [VRF] instances */
  for (ALL_LIST_ELEMENTS_RO(om->ospf, n1, ospf)) {
    /* Update distribute-list, and apply filter. */
    for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
      struct list *red_list;
      struct ospf_redist *red;

      red_list = ospf->redist[type];
      if (red_list)
        for (ALL_LIST_ELEMENTS_RO(red_list, node,
                red)) {
          if (ROUTEMAP(red)) {
            /* if route-map is not NULL it
             * may be
             * using this access list */
            ospf_distribute_list_update(
              ospf, type,
              red->instance);
          }
        }

      /* There is place for route-map for default-information
       * (ZEBRA_ROUTE_MAX),
       * but no distribute list. */
      if (type == ZEBRA_ROUTE_MAX)
        break;

      if (DISTRIBUTE_NAME(ospf, type)) {
        /* Keep old access-list for distribute-list. */
        struct access_list *old =
          DISTRIBUTE_LIST(ospf, type);

        /* Update access-list for distribute-list. */
        DISTRIBUTE_LIST(ospf, type) =
          access_list_lookup(
            AFI_IP,
            DISTRIBUTE_NAME(ospf, type));

        /* No update for this distribute type. */
        if (old == NULL
            && DISTRIBUTE_LIST(ospf, type) == NULL)
          continue;

        /* Schedule distribute-list update timer. */
        if (DISTRIBUTE_LIST(ospf, type) == NULL
            || strcmp(DISTRIBUTE_NAME(ospf, type),
                access->name)
                 == 0)
          ospf_distribute_list_update(ospf, type,
                    0);
      }
    }

    /* Update Area access-list. */
    for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
      if (EXPORT_NAME(area)) {
        EXPORT_LIST(area) = NULL;
        abr_inv++;
      }

      if (IMPORT_NAME(area)) {
        IMPORT_LIST(area) = NULL;
        abr_inv++;
      }
    }

    /* Schedule ABR tasks -- this will be changed -- takada. */
    if (IS_OSPF_ABR(ospf) && abr_inv)
      ospf_schedule_abr_task(ospf);
  }
}

/* If prefix-list is updated, do some updates. */
static void ospf_prefix_list_update(struct prefix_list *plist)
{
  struct ospf *ospf = NULL;
  int type;
  int abr_inv = 0;
  struct ospf_area *area;
  struct listnode *node, *n1;

  /* If OSPF instatnce does not exist, return right now. */
  if (listcount(om->ospf) == 0)
    return;

  /* Iterate all ospf [VRF] instances */
  for (ALL_LIST_ELEMENTS_RO(om->ospf, n1, ospf)) {

    /* Update all route-maps which are used
     * as redistribution filters.
     * They might use prefix-list.
     */
    for (type = 0; type <= ZEBRA_ROUTE_MAX; type++) {
      struct list *red_list;
      struct ospf_redist *red;

      red_list = ospf->redist[type];
      if (!red_list)
        continue;

      for (ALL_LIST_ELEMENTS_RO(red_list, node, red)) {
        if (ROUTEMAP(red)) {
          /* if route-map is not NULL
           * it may be using
           * this prefix list */
          ospf_distribute_list_update(
            ospf, type, red->instance);
        }
      }
    }

    /* Update area filter-lists. */
    for (ALL_LIST_ELEMENTS_RO(ospf->areas, node, area)) {
      /* Update filter-list in. */
      if (PREFIX_NAME_IN(area)
          && strcmp(PREFIX_NAME_IN(area),
              prefix_list_name(plist))
               == 0) {
        PREFIX_LIST_IN(area) = prefix_list_lookup(
          AFI_IP, PREFIX_NAME_IN(area));
        abr_inv++;
      }

      /* Update filter-list out. */
      if (PREFIX_NAME_OUT(area)
          && strcmp(PREFIX_NAME_OUT(area),
              prefix_list_name(plist))
               == 0) {
        PREFIX_LIST_OUT(area) = prefix_list_lookup(
          AFI_IP, PREFIX_NAME_OUT(area));
        abr_inv++;
      }
    }

    /* Schedule ABR task. */
    if (IS_OSPF_ABR(ospf) && abr_inv)
      ospf_schedule_abr_task(ospf);
  }
}

static struct ospf_distance *ospf_distance_new(void)
{
  return XCALLOC(MTYPE_OSPF_DISTANCE, sizeof(struct ospf_distance));
}

static void ospf_distance_free(struct ospf_distance *odistance)
{
  XFREE(MTYPE_OSPF_DISTANCE, odistance);
}

int ospf_distance_set(struct vty *vty, struct ospf *ospf,
          const char *distance_str, const char *ip_str,
          const char *access_list_str)
{
  int ret;
  struct prefix_ipv4 p;
  uint8_t distance;
  struct route_node *rn;
  struct ospf_distance *odistance;

  ret = str2prefix_ipv4(ip_str, &p);
  if (ret == 0) {
    vty_out(vty, "Malformed prefix\n");
    return CMD_WARNING_CONFIG_FAILED;
  }

  distance = atoi(distance_str);

  /* Get OSPF distance node. */
  rn = route_node_get(ospf->distance_table, (struct prefix *)&p);
  if (rn->info) {
    odistance = rn->info;
    route_unlock_node(rn);
  } else {
    odistance = ospf_distance_new();
    rn->info = odistance;
  }

  /* Set distance value. */
  odistance->distance = distance;

  /* Reset access-list configuration. */
  if (odistance->access_list) {
    free(odistance->access_list);
    odistance->access_list = NULL;
  }
  if (access_list_str)
    odistance->access_list = strdup(access_list_str);

  return CMD_SUCCESS;
}

int ospf_distance_unset(struct vty *vty, struct ospf *ospf,
      const char *distance_str, const char *ip_str,
      char const *access_list_str)
{
  int ret;
  struct prefix_ipv4 p;
  struct route_node *rn;
  struct ospf_distance *odistance;

  ret = str2prefix_ipv4(ip_str, &p);
  if (ret == 0) {
    vty_out(vty, "Malformed prefix\n");
    return CMD_WARNING_CONFIG_FAILED;
  }

  rn = route_node_lookup(ospf->distance_table, (struct prefix *)&p);
  if (!rn) {
    vty_out(vty, "Can't find specified prefix\n");
    return CMD_WARNING_CONFIG_FAILED;
  }

  odistance = rn->info;

  if (odistance->access_list)
    free(odistance->access_list);
  ospf_distance_free(odistance);

  rn->info = NULL;
  route_unlock_node(rn);
  route_unlock_node(rn);

  return CMD_SUCCESS;
}

void ospf_distance_reset(struct ospf *ospf)
{
  struct route_node *rn;
  struct ospf_distance *odistance;

  for (rn = route_top(ospf->distance_table); rn; rn = route_next(rn)) {
    odistance = rn->info;
    if (!odistance)
      continue;

    if (odistance->access_list)
      free(odistance->access_list);
    ospf_distance_free(odistance);
    rn->info = NULL;
    route_unlock_node(rn);
  }
}

uint8_t ospf_distance_apply(struct ospf *ospf, struct prefix_ipv4 *p,
          struct ospf_route * or)
{

  if (ospf == NULL)
    return 0;

  if (ospf->distance_intra && or->path_type == OSPF_PATH_INTRA_AREA)
    return ospf->distance_intra;

  if (ospf->distance_inter && or->path_type == OSPF_PATH_INTER_AREA)
    return ospf->distance_inter;

  if (ospf->distance_external
      && (or->path_type == OSPF_PATH_TYPE1_EXTERNAL ||
    or->path_type == OSPF_PATH_TYPE2_EXTERNAL))
    return ospf->distance_external;

  if (ospf->distance_all)
    return ospf->distance_all;

  return 0;
}

void ospf_zebra_vrf_register(struct ospf *ospf)
{
  if (!zclient || zclient->sock < 0 || !ospf)
    return;

  if (ospf->vrf_id != VRF_UNKNOWN) {
    if (IS_DEBUG_OSPF_EVENT)
      zlog_debug("%s: Register VRF %s id %u", __func__,
           ospf_vrf_id_to_name(ospf->vrf_id),
           ospf->vrf_id);
    zclient_send_reg_requests(zclient, ospf->vrf_id);
  }
}

void ospf_zebra_vrf_deregister(struct ospf *ospf)
{
  if (!zclient || zclient->sock < 0 || !ospf)
    return;

  if (ospf->vrf_id != VRF_DEFAULT && ospf->vrf_id != VRF_UNKNOWN) {
    if (IS_DEBUG_OSPF_EVENT)
      zlog_debug("%s: De-Register VRF %s id %u to Zebra.",
           __func__, ospf_vrf_id_to_name(ospf->vrf_id),
           ospf->vrf_id);
    /* Deregister for router-id, interfaces,
     * redistributed routes. */
    zclient_send_dereg_requests(zclient, ospf->vrf_id);
  }
}

/* Label Manager Functions */

/**
 * Check if Label Manager is Ready or not.
 *
 * @return  True if Label Manager is ready, False otherwise
 */
bool ospf_zebra_label_manager_ready(void)
{
  return (zclient_sync->sock > 0);
}

/**
 * Request Label Range to the Label Manager.
 *
 * @param base    base label of the label range to request
 * @param chunk_size  size of the label range to request
 *
 * @return  0 on success, -1 on failure
 */
int ospf_zebra_request_label_range(uint32_t base, uint32_t chunk_size)
{
  int ret;
  uint32_t start, end;

  if (zclient_sync->sock < 0)
    return -1;

  ret = lm_get_label_chunk(zclient_sync, 0, base, chunk_size, &start,
         &end);
  if (ret < 0) {
    zlog_warn("%s: error getting label range!", __func__);
    return -1;
  }

  return 0;
}

/**
 * Release Label Range to the Label Manager.
 *
 * @param start   start of label range to release
 * @param end   end of label range to release
 *
 * @return    0 on success, -1 otherwise
 */
int ospf_zebra_release_label_range(uint32_t start, uint32_t end)
{
  int ret;

  if (zclient_sync->sock < 0)
    return -1;

  ret = lm_release_label_chunk(zclient_sync, start, end);
  if (ret < 0) {
    zlog_warn("%s: error releasing label range!", __func__);
    return -1;
  }

  return 0;
}

/**
 * Connect to the Label Manager.
 *
 * @return  0 on success, -1 otherwise
 */
int ospf_zebra_label_manager_connect(void)
{
  /* Connect to label manager. */
  if (zclient_socket_connect(zclient_sync) < 0) {
    zlog_warn("%s: failed connecting synchronous zclient!",
        __func__);
    return -1;
  }
  /* make socket non-blocking */
  set_nonblocking(zclient_sync->sock);

  /* Send hello to notify zebra this is a synchronous client */
  if (zclient_send_hello(zclient_sync) == ZCLIENT_SEND_FAILURE) {
    zlog_warn("%s: failed sending hello for synchronous zclient!",
        __func__);
    close(zclient_sync->sock);
    zclient_sync->sock = -1;
    return -1;
  }

  /* Connect to label manager */
  if (lm_label_manager_connect(zclient_sync, 0) != 0) {
    zlog_warn("%s: failed connecting to label manager!", __func__);
    if (zclient_sync->sock > 0) {
      close(zclient_sync->sock);
      zclient_sync->sock = -1;
    }
    return -1;
  }

  osr_debug("SR (%s): Successfully connected to the Label Manager",
      __func__);

  return 0;
}

static void ospf_zebra_connected(struct zclient *zclient)
{
  struct ospf *ospf;
  struct listnode *node;

  /* Send the client registration */
  bfd_client_sendmsg(zclient, ZEBRA_BFD_CLIENT_REGISTER, VRF_DEFAULT);

  zclient_send_reg_requests(zclient, VRF_DEFAULT);

  /* Activate graceful restart if configured. */
  for (ALL_LIST_ELEMENTS_RO(om->ospf, node, ospf)) {
    if (!ospf->gr_info.restart_support)
      continue;
    (void)ospf_zebra_gr_enable(ospf, ospf->gr_info.grace_period);
  }
}

/*
 * opaque messages between processes
 */
static int ospf_opaque_msg_handler(ZAPI_CALLBACK_ARGS)
{
  struct stream *s;
  struct zapi_opaque_msg info;
  struct ldp_igp_sync_if_state state;
  struct ldp_igp_sync_announce announce;
  struct zapi_opaque_reg_info dst;
  int ret = 0;

  s = zclient->ibuf;

  if (zclient_opaque_decode(s, &info) != 0)
    return -1;

  switch (info.type) {
  case LINK_STATE_SYNC:
    STREAM_GETC(s, dst.proto);
    STREAM_GETW(s, dst.instance);
    STREAM_GETL(s, dst.session_id);
    dst.type = LINK_STATE_SYNC;
    ret = ospf_te_sync_ted(dst);
    break;
  case LDP_IGP_SYNC_IF_STATE_UPDATE:
    STREAM_GET(&state, s, sizeof(state));
    ret = ospf_ldp_sync_state_update(state);
    break;
  case LDP_IGP_SYNC_ANNOUNCE_UPDATE:
    STREAM_GET(&announce, s, sizeof(announce));
    ret = ospf_ldp_sync_announce_update(announce);
    break;
  default:
    break;
  }

stream_failure:

  return ret;
}

static int ospf_zebra_client_close_notify(ZAPI_CALLBACK_ARGS)
{
  int ret = 0;

  struct zapi_client_close_info info;

  if (zapi_client_close_notify_decode(zclient->ibuf, &info) < 0)
    return -1;

  ospf_ldp_sync_handle_client_close(&info);

  return ret;
}

static zclient_handler *const ospf_handlers[] = {
  [ZEBRA_ROUTER_ID_UPDATE] = ospf_router_id_update_zebra,
  [ZEBRA_INTERFACE_ADDRESS_ADD] = ospf_interface_address_add,
  [ZEBRA_INTERFACE_ADDRESS_DELETE] = ospf_interface_address_delete,
  [ZEBRA_INTERFACE_LINK_PARAMS] = ospf_interface_link_params,
  [ZEBRA_INTERFACE_VRF_UPDATE] = ospf_interface_vrf_update,

  [ZEBRA_REDISTRIBUTE_ROUTE_ADD] = ospf_zebra_read_route,
  [ZEBRA_REDISTRIBUTE_ROUTE_DEL] = ospf_zebra_read_route,
  [ZEBRA_NEXTHOP_UPDATE] = ospf_zebra_import_check_update,

  [ZEBRA_OPAQUE_MESSAGE] = ospf_opaque_msg_handler,

  [ZEBRA_CLIENT_CLOSE_NOTIFY] = ospf_zebra_client_close_notify,
};

void ospf_zebra_init(struct event_loop *master, unsigned short instance)
{
  /* Allocate zebra structure. */
  zclient = zclient_new(master, &zclient_options_default, ospf_handlers,
            array_size(ospf_handlers));
  zclient_init(zclient, ZEBRA_ROUTE_OSPF, instance, &ospfd_privs);
  zclient->zebra_connected = ospf_zebra_connected;

  /* Initialize special zclient for synchronous message exchanges. */
  struct zclient_options options = zclient_options_default;
  options.synchronous = true;
  zclient_sync = zclient_new(master, &options, NULL, 0);
  zclient_sync->sock = -1;
  zclient_sync->redist_default = ZEBRA_ROUTE_OSPF;
  zclient_sync->instance = instance;
  /*
   * session_id must be different from default value (0) to distinguish
   * the asynchronous socket from the synchronous one
   */
  zclient_sync->session_id = 1;
  zclient_sync->privs = &ospfd_privs;

  access_list_add_hook(ospf_filter_update);
  access_list_delete_hook(ospf_filter_update);
  prefix_list_add_hook(ospf_prefix_list_update);
  prefix_list_delete_hook(ospf_prefix_list_update);
}

void ospf_zebra_send_arp(const struct interface *ifp, const struct prefix *p)
{
  zclient_send_neigh_discovery_req(zclient, ifp, p);
}

Coverage Report

Created: 2025-10-23 06:55