C++ UNSET_FLAG函数代码示例

/* communicate the withdrawal of a connected address */
static void connected_withdraw(struct connected *ifc)
{
	if (!ifc)
		return;

	/* Update interface address information to protocol daemon. */
	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
		zebra_interface_address_delete_update(ifc->ifp, ifc);

		if (ifc->address->family == AF_INET)
			if_subnet_delete(ifc->ifp, ifc);

		if (ifc->address->family == AF_INET)
			connected_down_ipv4(ifc->ifp, ifc);
#ifdef HAVE_IPV6
		else
			connected_down_ipv6(ifc->ifp, ifc);
#endif

		UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
	}

	/* The address is not in the kernel anymore, so clear the flag */
	UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

	if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
		listnode_delete(ifc->ifp->connected, ifc);
		connected_free(ifc);
	}
}

void
ospf_abr_unapprove_summaries (struct ospf *ospf)
{
  listnode node;
  struct ospf_area *area;
  struct route_node *rn;
  struct ospf_lsa *lsa;

  if (IS_DEBUG_OSPF_EVENT)
    zlog_info ("ospf_abr_unapprove_summaries(): Start");

  for (node = listhead (ospf->areas); node; nextnode (node))
    {
      area = getdata (node);
      LSDB_LOOP (SUMMARY_LSDB (area), rn, lsa)
	if (ospf_lsa_is_self_originated (ospf, lsa))
	  UNSET_FLAG (lsa->flags, OSPF_LSA_APPROVED);

      LSDB_LOOP (ASBR_SUMMARY_LSDB (area), rn, lsa)
	if (ospf_lsa_is_self_originated (ospf, lsa))
	  UNSET_FLAG (lsa->flags, OSPF_LSA_APPROVED);
    }

  if (IS_DEBUG_OSPF_EVENT)
    zlog_info ("ospf_abr_unapprove_summaries(): Stop");
}

/* Handle implicit withdrawals of addresses, where a system ADDs an address
 * to an interface which already has the same address configured.
 *
 * Returns the struct connected which must be announced to clients,
 * or NULL if nothing to do.
 */
static struct connected *
connected_implicit_withdraw (struct interface *ifp, struct connected *ifc)
{
  struct connected *current;
  
  /* Check same connected route. */
  if ((current = connected_check (ifp, (struct prefix *) ifc->address)))
    {
      if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
        SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
	  
	  if (CHECK_FLAG (current->ipv6_config, RTMD_IPV6_ADDR_CONFIG))
		SET_FLAG (ifc->ipv6_config, RTMD_IPV6_ADDR_CONFIG);
	
      /* Avoid spurious withdraws, this might be just the kernel 'reflecting'
       * back an address we have already added.
       */
      if (connected_same (current, ifc))
        {
          /* nothing to do */
          connected_free (ifc);
          return NULL;
        }
      
      UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
      UNSET_FLAG(current->ipv6_config, RTMD_IPV6_ADDR_CONFIG);
      connected_withdraw (current); /* implicit withdraw - freebsd does this */
    }
  return ifc;
}

/* Handle an interface delete event */
void 
if_delete_update (struct interface *ifp)
{
  struct listnode *node;
  struct listnode *next;
  struct connected *ifc;
  struct prefix *p;

  if (if_is_up(ifp))
    {
      zlog_err ("interface %s index %d is still up while being deleted.",
	    ifp->name, ifp->ifindex);
      return;
    }

  /* Mark interface as inactive */
  UNSET_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE);
  
  if (IS_ZEBRA_DEBUG_KERNEL)
    zlog_info ("interface %s index %d is now inactive.",
	       ifp->name, ifp->ifindex);

  /* Delete connected routes from the kernel. */
  if (ifp->connected)
    {
      for (node = listhead (ifp->connected); node; node = next)
	{
	  next = node->next;
	  ifc = getdata (node);
	  p = ifc->address;

	  if (p->family == AF_INET)
	    connected_down_ipv4 (ifp, ifc);
#ifdef HAVE_IPV6
	  else if (p->family == AF_INET6)
	    connected_down_ipv6 (ifp, ifc);
#endif /* HAVE_IPV6 */

	  zebra_interface_address_delete_update (ifp, ifc);

	  UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
	  
	  if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
	    {      
	      listnode_delete (ifp->connected, ifc);
	      connected_free (ifc);
	    }
	}
    }
  zebra_interface_delete_update (ifp);
}

int
ospf_area_range_substitute_unset (struct ospf *ospf, struct in_addr area_id,
				  struct prefix_ipv4 *p)
{
  struct ospf_area *area;
  struct ospf_area_range *range;

  area = ospf_area_lookup_by_area_id (ospf, area_id);
  if (area == NULL)
    return 0;

  range = ospf_area_range_lookup (area, p);
  if (range == NULL)
    return 0;

  if (CHECK_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE))
    if (ospf_area_range_active (range))
      ospf_schedule_abr_task (ospf);

  UNSET_FLAG (range->flags, OSPF_AREA_RANGE_SUBSTITUTE);
  range->subst_addr.s_addr = 0;
  range->subst_masklen = 0;

  return 1;
}

int
ospf_area_range_set (struct ospf *ospf, struct in_addr area_id,
		     struct prefix_ipv4 *p, int advertise)
{
  struct ospf_area *area;
  struct ospf_area_range *range;
  int ret = OSPF_AREA_ID_FORMAT_ADDRESS;

  area = ospf_area_get (ospf, area_id, ret);
  if (area == NULL)
    return 0;

  range = ospf_area_range_lookup (area, p);
  if (range != NULL)
    {
      if ((CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE)
	   && !CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE))
	  || (!CHECK_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE)
	      && CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE)))
	ospf_schedule_abr_task (ospf);
    }
  else
    {
      range = ospf_area_range_new (p);
      ospf_area_range_add (area, range);
      ospf_schedule_abr_task (ospf);
    }

  if (CHECK_FLAG (advertise, OSPF_AREA_RANGE_ADVERTISE))
    SET_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE);
  else
    UNSET_FLAG (range->flags, OSPF_AREA_RANGE_ADVERTISE);

  return 1;
}

static int
bgp_graceful_restart_timer_expire (struct thread *thread)
{
  struct peer *peer;
  afi_t afi;
  safi_t safi;

  peer = THREAD_ARG (thread);
  peer->t_gr_restart = NULL;

  /* NSF delete stale route */
  for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
    for (safi = SAFI_UNICAST ; safi < SAFI_RESERVED_3 ; safi++)
      if (peer->nsf[afi][safi])
	bgp_clear_stale_route (peer, afi, safi);

  UNSET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT);
  BGP_TIMER_OFF (peer->t_gr_stale);

  if (BGP_DEBUG (events, EVENTS))
    {
      zlog_debug ("%s graceful restart timer expired", peer->host);
      zlog_debug ("%s graceful restart stalepath timer stopped", peer->host);
    }

  bgp_timer_set (peer);

  return 0;
}

/* Tie an interface address to its derived subnet list of addresses. */
int
if_subnet_add (struct interface *ifp, struct connected *ifc)
{
  struct route_node *rn;
  struct zebra_if *zebra_if;
  struct prefix cp;
  struct list *addr_list;

  assert (ifp && ifp->info && ifc);
  zebra_if = ifp->info;

  /* Get address derived subnet node and associated address list, while marking
     address secondary attribute appropriately. */
  cp = *ifc->address;
  apply_mask (&cp);
  rn = route_node_get (zebra_if->ipv4_subnets, &cp);

  if ((addr_list = rn->info))
    SET_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY);
  else
    {
      UNSET_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY);
      rn->info = addr_list = list_new ();
      route_lock_node (rn);
    }

  /* Tie address at the tail of address list. */
  listnode_add (addr_list, ifc);
  
  /* Return list element count. */
  return (addr_list->count);
}

static void
ospf6_abr_range_update (struct ospf6_route *range)
{
  u_int32_t cost = 0;
  struct ospf6_route *ro;

  assert (range->type == OSPF6_DEST_TYPE_RANGE);

  /* update range's cost and active flag */
  for (ro = ospf6_route_match_head (&range->prefix, ospf6->route_table);
       ro; ro = ospf6_route_match_next (&range->prefix, ro))
    {
      if (ro->path.area_id == range->path.area_id &&
          ! CHECK_FLAG (ro->flag, OSPF6_ROUTE_REMOVE))
        cost = MAX (cost, ro->path.cost);
    }

  if (range->path.cost != cost)
    {
      range->path.cost = cost;

      if (range->path.cost)
        SET_FLAG (range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);
      else
        UNSET_FLAG (range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY);

      ospf6_abr_originate_summary (range);
    }
}

static int
bgp_capability_restart (struct peer *peer, struct capability_header *caphdr)
{
  struct stream *s = BGP_INPUT (peer);
  u_int16_t restart_flag_time;
  int restart_bit = 0;
  size_t end = stream_get_getp (s) + caphdr->length;

  SET_FLAG (peer->cap, PEER_CAP_RESTART_RCV);
  restart_flag_time = stream_getw(s);
  if (CHECK_FLAG (restart_flag_time, RESTART_R_BIT))
    restart_bit = 1;
  UNSET_FLAG (restart_flag_time, 0xF000);
  peer->v_gr_restart = restart_flag_time;

  if (BGP_DEBUG (normal, NORMAL))
    {
      zlog_debug ("%s OPEN has Graceful Restart capability", peer->host);
      zlog_debug ("%s Peer has%srestarted. Restart Time : %d",
                  peer->host, restart_bit ? " " : " not ",
                  peer->v_gr_restart);
    }

  while (stream_get_getp (s) + 4 <= end)
    {
      afi_t afi = stream_getw (s);
      safi_t safi = stream_getc (s);
      u_char flag = stream_getc (s);
      
      if (!bgp_afi_safi_valid_indices (afi, &safi))
        {
          if (BGP_DEBUG (normal, NORMAL))
            zlog_debug ("%s Addr-family %d/%d(afi/safi) not supported."
                        " Ignore the Graceful Restart capability",
                        peer->host, afi, safi);
        }
      else if (!peer->afc[afi][safi])
        {
          if (BGP_DEBUG (normal, NORMAL))
            zlog_debug ("%s Addr-family %d/%d(afi/safi) not enabled."
                        " Ignore the Graceful Restart capability",
                        peer->host, afi, safi);
        }
      else
        {
          if (BGP_DEBUG (normal, NORMAL))
            zlog_debug ("%s Address family %s is%spreserved", peer->host,
                        afi_safi_print (afi, safi),
                        CHECK_FLAG (peer->af_cap[afi][safi],
                                    PEER_CAP_RESTART_AF_PRESERVE_RCV)
                        ? " " : " not ");

          SET_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_RCV);
          if (CHECK_FLAG (flag, RESTART_F_BIT))
            SET_FLAG (peer->af_cap[afi][safi], PEER_CAP_RESTART_AF_PRESERVE_RCV);
          
        }
    }
  return 0;
}

/* Add connected IPv6 route to the interface. */
void
connected_add_ipv6 (struct interface *ifp, int flags, struct in6_addr *addr,
		    u_char prefixlen, struct in6_addr *broad,
		    const char *label)
{
  struct prefix_ipv6 *p;
  struct connected *ifc;

  /* Make connected structure. */
  ifc = connected_new ();
  ifc->ifp = ifp;
  ifc->flags = flags;
  /* If we get a notification from the kernel,
   * we can safely assume the address is known to the kernel */
  SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);

  /* Allocate new connected address. */
  p = prefix_ipv6_new ();
  p->family = AF_INET6;
  IPV6_ADDR_COPY (&p->prefix, addr);
  p->prefixlen = prefixlen;
  ifc->address = (struct prefix *) p;

  /* If there is broadcast or peer address. */
  if (broad)
    {
      if (IN6_IS_ADDR_UNSPECIFIED(broad))
	zlog_warn("warning: %s called for interface %s with unspecified "
		  "destination address; ignoring!", __func__, ifp->name);
      else
	{
	  p = prefix_ipv6_new ();
	  p->family = AF_INET6;
	  IPV6_ADDR_COPY (&p->prefix, broad);
	  p->prefixlen = prefixlen;
	  ifc->destination = (struct prefix *) p;
	}
    }
  if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER) && !ifc->destination)
    {
      zlog_warn("warning: %s called for interface %s "
		"with peer flag set, but no peer address supplied",
		__func__, ifp->name);
      UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
    }

  /* Label of this address. */
  if (label)
    ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);

  /* On Linux, we only get here when DAD is complete, therefore we can set
   * ZEBRA_IFC_REAL.
   *
   * On BSD, there currently doesn't seem to be a way to check for completion of
   * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL, although DAD
   * might still be running.
   */
  SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
  connected_update(ifp, ifc);
}

/* Handle changes to addresses and send the neccesary announcements
 * to clients. */
static void connected_update(struct interface *ifp, struct connected *ifc)
{
	struct connected *current;

	/* Check same connected route. */
	if ((current = connected_check(ifp, (struct prefix *)ifc->address))) {
		if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
			SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);

		/* Avoid spurious withdraws, this might be just the kernel 'reflecting'
		 * back an address we have already added.
		 */
		if (connected_same(current, ifc)) {
			/* nothing to do */
			connected_free(ifc);
			return;
		}

		/* Clear the configured flag on the old ifc, so it will be freed by
		 * connected withdraw. */
		UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
		connected_withdraw(current);	/* implicit withdraw - freebsd does this */
	}

	/* If the connected is new or has changed, announce it, if it is usable */
	if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
		connected_announce(ifp, ifc);
}

/* Handle implicit withdrawals of addresses, where a system ADDs an address
 * to an interface which already has the same address configured.
 *
 * Returns the struct connected which must be announced to clients,
 * or NULL if nothing to do.
 */
static struct connected *
connected_implicit_withdraw (struct interface *ifp, struct connected *ifc)
{
  struct connected *current;
  
  /* Check same connected route. */
  if ((current = connected_check (ifp, (struct prefix *) ifc->address)))
    {
      if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
        SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
	
      /* Avoid spurious withdraws, this might be just the kernel 'reflecting'
       * back an address we have already added.
       */
      if (connected_same (current, ifc) && CHECK_FLAG(current->conf, ZEBRA_IFC_REAL))
        {
          /* nothing to do */
          connected_free (ifc);
          return NULL;
        }
      
      UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);

      if(CHECK_FLAG (current->flags, ZEBRA_IFA_EXPIRES))
      {
        SET_FLAG (ifc->flags, ZEBRA_IFA_EXPIRES);
      }
      ifc->expires = current->expires; // HSA - need to copy over address expiration info if we are to explicitly withdraw a route

      connected_withdraw (current); /* implicit withdraw - freebsd does this */
    }
  return ifc;
}

void
nsm_reset_nbr (struct ospf_neighbor *nbr)
{
  /* Clear Database Summary list. */
  if (!ospf_db_summary_isempty (nbr))
    ospf_db_summary_clear (nbr);

  /* Clear Link State Request list. */
  if (!ospf_ls_request_isempty (nbr))
    ospf_ls_request_delete_all (nbr);

  /* Clear Link State Retransmission list. */
  if (!ospf_ls_retransmit_isempty (nbr))
    ospf_ls_retransmit_clear (nbr);

  /* Cancel thread. */
  OSPF_NSM_TIMER_OFF (nbr->t_db_desc);
  OSPF_NSM_TIMER_OFF (nbr->t_ls_req);
  OSPF_NSM_TIMER_OFF (nbr->t_ls_upd);
  OSPF_NSM_TIMER_OFF (nbr->t_hello_reply);

#ifdef HAVE_OPAQUE_LSA
  if (CHECK_FLAG (nbr->options, OSPF_OPTION_O))
    UNSET_FLAG (nbr->options, OSPF_OPTION_O);
#endif /* HAVE_OPAQUE_LSA */
}

void ospf_vl_unapprove(struct ospf *ospf)
{
	struct listnode *node;
	struct ospf_vl_data *vl_data;

	for (ALL_LIST_ELEMENTS_RO(ospf->vlinks, node, vl_data))
		UNSET_FLAG(vl_data->flags, OSPF_VL_FLAG_APPROVED);
}