C++ IPV4_ADDR_SAME函数代码示例

void
ospf_vl_up_check (struct ospf_area *area, struct in_addr rid,
                  struct vertex *v)
{
  struct ospf *ospf = area->ospf;
  struct listnode *node;
  struct ospf_vl_data *vl_data;
  struct ospf_interface *oi;

  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_debug ("ospf_vl_up_check(): Start");
      zlog_debug ("ospf_vl_up_check(): Router ID is %s", inet_ntoa (rid));
      zlog_debug ("ospf_vl_up_check(): Area is %s", inet_ntoa (area->area_id));
    }

  for (node = listhead (ospf->vlinks); node; nextnode (node))
    {
      if ((vl_data = getdata (node)) == NULL)
        continue;
  
      if (IS_DEBUG_OSPF_EVENT)
	{
	  zlog_debug ("ospf_vl_up_check(): considering VL, name: %s", 
		     vl_data->vl_oi->ifp->name);
	  zlog_debug ("ospf_vl_up_check(): VL area: %s, peer ID: %s", 
		     inet_ntoa (vl_data->vl_area_id),
		     inet_ntoa (vl_data->vl_peer));
	}

      if (IPV4_ADDR_SAME (&vl_data->vl_peer, &rid) &&
          IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        {
          oi = vl_data->vl_oi;
          SET_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED);

	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_debug ("ospf_vl_up_check(): this VL matched");

          if (oi->state == ISM_Down)
            {
	      if (IS_DEBUG_OSPF_EVENT)
		zlog_debug ("ospf_vl_up_check(): VL is down, waking it up");
              SET_FLAG (oi->ifp->flags, IFF_UP);
              OSPF_ISM_EVENT_EXECUTE(oi,ISM_InterfaceUp);
            }

         if (ospf_vl_set_params (vl_data, v))
           {
             if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change,"
                          " scheduling router lsa refresh");
             if(ospf->backbone)
               ospf_router_lsa_timer_add (ospf->backbone);
             else if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change, no backbone!");
           }
        }
    }
}

/* Look up vl_data for given peer, optionally qualified to be in the
 * specified area. NULL area returns first found..
 */
struct ospf_vl_data *
ospf_vl_lookup (struct ospf *ospf, struct ospf_area *area,
                struct in_addr vl_peer)
{
  struct ospf_vl_data *vl_data;
  struct listnode *node;
  
  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_debug ("%s: Looking for %s", __func__, inet_ntoa (vl_peer));
      if (area)
        zlog_debug ("%s: in area %s", __func__, inet_ntoa (area->area_id));
    }
  
  for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data))
    {
      if (IS_DEBUG_OSPF_EVENT)
        zlog_debug ("%s: VL %s, peer %s", __func__,
                    vl_data->vl_oi->ifp->name,
                    inet_ntoa (vl_data->vl_peer));
      
      if (area && !IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        continue;
      
      if (IPV4_ADDR_SAME (&vl_data->vl_peer, &vl_peer))
        return vl_data;
    }

  return NULL;
}

int
nsm_twoway_received (struct ospf_neighbor *nbr)
{
  struct ospf_interface *oi;
  int next_state = NSM_TwoWay;

  oi = nbr->oi;

  /* These netowork types must be adjacency. */
  if (oi->type == OSPF_IFTYPE_POINTOPOINT ||
      oi->type == OSPF_IFTYPE_POINTOMULTIPOINT ||
      oi->type == OSPF_IFTYPE_VIRTUALLINK)
    next_state = NSM_ExStart;

  /* Router itself is the DRouter or the BDRouter. */
  if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)) ||
      IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi)))
    next_state = NSM_ExStart;

  /* Neighboring Router is the DRouter or the BDRouter. */
  if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router) ||
      IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))
    next_state = NSM_ExStart;

  return next_state;
}

int
nsm_adj_ok (struct ospf_neighbor *nbr)
{
  struct ospf_interface *oi;
  int next_state;
  int flag = 0;

  oi = nbr->oi;
  next_state = nbr->state;

  /* These netowork types must be adjacency. */
  if (oi->type == OSPF_IFTYPE_POINTOPOINT
      || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT
      || oi->type == OSPF_IFTYPE_VIRTUALLINK)
    flag = 1;

  /* Router itself is the DRouter or the BDRouter. */
  if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi))
      || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi)))
    flag = 1;

  if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi))
      || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi)))
    flag = 1;

  if (nbr->state == NSM_TwoWay && flag == 1)
    next_state = NSM_ExStart;
  else if (nbr->state >= NSM_ExStart && flag == 0)
    next_state = NSM_TwoWay;

  return next_state;
}

int
ospf_dr_election (struct ospf_interface *oi)
{
  struct in_addr old_dr, old_bdr;
  int old_state, new_state;
  struct list *el_list;
  struct ospf_neighbor *dr, *bdr;

  /* backup current values. */
  old_dr = DR (oi);
  old_bdr = BDR (oi);
  old_state = oi->state;

  el_list = list_new ();

  /* List eligible routers. */
  ospf_dr_eligible_routers (oi->nbrs, el_list);

  /* First election of DR and BDR. */
  bdr = ospf_elect_bdr (oi, el_list);
  dr = ospf_elect_dr (oi, el_list);

  new_state = ospf_ism_state (oi);

  zlog_info ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi)));
  zlog_info ("DR-Election[1st]: DR     %s", inet_ntoa (DR (oi)));

  if (new_state != old_state &&
      !(new_state == ISM_DROther && old_state < ISM_DROther))
    {
      ospf_elect_bdr (oi, el_list);
      ospf_elect_dr (oi, el_list); 

      new_state = ospf_ism_state (oi);

      zlog_info ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi)));
      zlog_info ("DR-Election[2nd]: DR     %s", inet_ntoa (DR (oi)));
    }

  list_delete (el_list);

  /* if DR or BDR changes, cause AdjOK? neighbor event. */
  if (!IPV4_ADDR_SAME (&old_dr, &DR (oi)) ||
      !IPV4_ADDR_SAME (&old_bdr, &BDR (oi)))
    ospf_dr_change (oi->ospf, oi->nbrs);

  if (oi->type == OSPF_IFTYPE_BROADCAST || oi->type == OSPF_IFTYPE_POINTOPOINT)
    {
      /* Multicast group change. */
      if ((old_state != ISM_DR && old_state != ISM_Backup) &&
	  (new_state == ISM_DR || new_state == ISM_Backup))
	ospf_if_add_alldrouters (oi->ospf, oi->address, oi->ifp->ifindex);
      else if ((old_state == ISM_DR || old_state == ISM_Backup) &&
	       (new_state != ISM_DR && new_state != ISM_Backup))
	ospf_if_drop_alldrouters (oi->ospf, oi->address, oi->ifp->ifindex);
    }

  return new_state;
}

void
ospf_vl_up_check (struct ospf_area *area, struct in_addr rid,
                  struct vertex *v)
{
  struct ospf *ospf = area->ospf;
  struct listnode *node;
  struct ospf_vl_data *vl_data;
  struct ospf_interface *oi;

  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_debug ("ospf_vl_up_check(): Start");
      zlog_debug ("ospf_vl_up_check(): Router ID is %s", inet_ntoa (rid));
      zlog_debug ("ospf_vl_up_check(): Area is %s", inet_ntoa (area->area_id));
    }

  for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data))
    {
      if (IS_DEBUG_OSPF_EVENT)
	{
	  zlog_debug ("%s: considering VL, %s in area %s", __func__,
		     vl_data->vl_oi->ifp->name,
		     inet_ntoa (vl_data->vl_area_id));
	  zlog_debug ("%s: peer ID: %s", __func__,
		     inet_ntoa (vl_data->vl_peer));
	}

      if (IPV4_ADDR_SAME (&vl_data->vl_peer, &rid) &&
          IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        {
          oi = vl_data->vl_oi;
          SET_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED);

	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_debug ("ospf_vl_up_check(): this VL matched");

          if (oi->state == ISM_Down)
            {
	      if (IS_DEBUG_OSPF_EVENT)
		zlog_debug ("ospf_vl_up_check(): VL is down, waking it up");
              SET_FLAG (oi->ifp->flags, IFF_UP);
              OSPF_ISM_EVENT_EXECUTE(oi,ISM_InterfaceUp);
            }

         if (ospf_vl_set_params (vl_data, v))
           {
             if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change,"
                          " scheduling router lsa refresh");
             if (ospf->backbone)
               ospf_router_lsa_update_area (ospf->backbone);
             else if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change, no backbone!");
           }
        }
    }
}

static int ospf_ism_state(struct ospf_interface *oi)
{
	if (IPV4_ADDR_SAME(&DR(oi), &oi->address->u.prefix4))
		return ISM_DR;
	else if (IPV4_ADDR_SAME(&BDR(oi), &oi->address->u.prefix4))
		return ISM_Backup;
	else
		return ISM_DROther;
}

void
ospf_vl_up_check (struct ospf_area *area, struct in_addr rid,
                  struct vertex *v)
{
  struct ospf *ospf = area->ospf;
  listnode node;
  struct ospf_vl_data *vl_data;
  struct ospf_interface *oi;

  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_info ("ospf_vl_up_check(): Start");
      zlog_info ("ospf_vl_up_check(): Router ID is %s", inet_ntoa (rid));
      zlog_info ("ospf_vl_up_check(): Area is %s", inet_ntoa (area->area_id));
    }

  for (node = listhead (ospf->vlinks); node; nextnode (node))
    {
      if ((vl_data = getdata (node)) == NULL)
        continue;
  
      if (IS_DEBUG_OSPF_EVENT)
	{
	  zlog_info ("ospf_vl_up_check(): considering VL, name: %s", 
		     vl_data->vl_oi->ifp->name);
	  zlog_info ("ospf_vl_up_check(): VL area: %s, peer ID: %s", 
		     inet_ntoa (vl_data->vl_area_id),
		     inet_ntoa (vl_data->vl_peer));
	}

      if (IPV4_ADDR_SAME (&vl_data->vl_peer, &rid) &&
          IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        {
          oi = vl_data->vl_oi;
          SET_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED);

	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_info ("ospf_vl_up_check(): this VL matched");

          if (oi->state == ISM_Down)
            {
	      if (IS_DEBUG_OSPF_EVENT)
		zlog_info ("ospf_vl_up_check(): VL is down, waking it up");
              SET_FLAG (oi->ifp->flags, IFF_UP);
              OSPF_ISM_EVENT_SCHEDULE (oi, ISM_InterfaceUp);
            }

          ospf_vl_set_params (vl_data, v);
        }
    }
}

static int
ospf_dr_election (struct ospf_interface *oi)
{
  struct in_addr old_dr, old_bdr;
  int old_state, new_state;
  struct list *el_list;
  struct ospf_neighbor *dr, *bdr;

  /* backup current values. */
  old_dr = DR (oi);
  old_bdr = BDR (oi);
  old_state = oi->state;

  el_list = list_new ();

  /* List eligible routers. */
  ospf_dr_eligible_routers (oi->nbrs, el_list);

  /* First election of DR and BDR. */
  bdr = ospf_elect_bdr (oi, el_list);
  dr = ospf_elect_dr (oi, el_list);

  new_state = ospf_ism_state (oi);

  zlog_info ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi)));
  zlog_info ("DR-Election[1st]: DR     %s", inet_ntoa (DR (oi)));

  if (new_state != old_state &&
      !(new_state == ISM_DROther && old_state < ISM_DROther))
    {
      ospf_elect_bdr (oi, el_list);
      ospf_elect_dr (oi, el_list); 

      new_state = ospf_ism_state (oi);

      zlog_info ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi)));
      zlog_info ("DR-Election[2nd]: DR     %s", inet_ntoa (DR (oi)));
    }

  list_delete (el_list);

  /* if DR or BDR changes, cause AdjOK? neighbor event. */
  if (!IPV4_ADDR_SAME (&old_dr, &DR (oi)) ||
      !IPV4_ADDR_SAME (&old_bdr, &BDR (oi)))
    ospf_dr_change (oi->ospf, oi->nbrs);

  return new_state;
}

/*
*  check if interface with given address is configured and
*  return it if yes.  special treatment for PtP networks.
*/
struct ospf_interface *
ospf_if_is_configured (struct ospf *ospf, struct in_addr *address)
{
  struct listnode *node, *nnode;
  struct ospf_interface *oi;
  struct prefix_ipv4 addr;

  addr.family = AF_INET;
  addr.prefix = *address;
  addr.prefixlen = IPV4_MAX_PREFIXLEN;

  for (ALL_LIST_ELEMENTS (ospf->oiflist, node, nnode, oi))
    if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
      {
        if (oi->type == OSPF_IFTYPE_POINTOPOINT)
	  {
	    /* special leniency: match if addr is anywhere on peer subnet */
	    if (prefix_match(CONNECTED_PREFIX(oi->connected),
			     (struct prefix *)&addr))
	      return oi;
	  }
        else
	  {
	    if (IPV4_ADDR_SAME (address, &oi->address->u.prefix4))
	      return oi;
	  }
      }
  return NULL;
}

/*
*  check if interface with given address is configured and
*  return it if yes.
*/
struct ospf_interface *
ospf_if_is_configured (struct ospf *ospf, struct in_addr *address)
{
  listnode node;
  struct ospf_interface *oi;
  struct prefix *addr;
  struct prefix query_addr;
  
  for (node = listhead (ospf->oiflist); node; nextnode (node))
    if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
      {
/*	if (oi->type == OSPF_IFTYPE_POINTOPOINT)
	  addr = oi->connected->destination;
	else
*/
	  addr = oi->address;

	  query_addr.family = AF_INET;
	  query_addr.u.prefix4 = *address;
	  query_addr.prefixlen = IPV4_ALLOWABLE_BITLEN_P2P;
	  
	if (oi->type == OSPF_IFTYPE_POINTOPOINT && 
	     prefix_match (addr, &query_addr))
	     return oi;
	else if (IPV4_ADDR_SAME (address, &addr->u.prefix4))
	  return oi;
      }

  return NULL;
}

/* Lookup interface by IPv4 address. */
struct interface *
if_lookup_exact_address (struct in_addr src)
{
  listnode node;
  listnode cnode;
  struct interface *ifp;
  struct prefix *p;
  struct connected *c;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);

      for (cnode = listhead (ifp->connected); cnode; nextnode (cnode))
	{
	  c = getdata (cnode);

	  p = c->address;

	  if (p && p->family == AF_INET)
	    {
	      if (IPV4_ADDR_SAME (&p->u.prefix4, &src))
		return ifp;
	    }	      
	}
    }
  return NULL;
}

void ospf_nbr_state_message(struct ospf_neighbor *nbr, char *buf, size_t size)
{
	int state;
	struct ospf_interface *oi = nbr->oi;

	if (IPV4_ADDR_SAME(&DR(oi), &nbr->address.u.prefix4))
		state = ISM_DR;
	else if (IPV4_ADDR_SAME(&BDR(oi), &nbr->address.u.prefix4))
		state = ISM_Backup;
	else
		state = ISM_DROther;

	snprintf(buf, size, "%s/%s",
		 lookup_msg(ospf_nsm_state_msg, nbr->state, NULL),
		 lookup_msg(ospf_ism_state_msg, state, NULL));
}

/* 10.4 of RFC2328, indicate whether an adjacency is appropriate with
 * the given neighbour
 */
static int
nsm_should_adj (struct ospf_neighbor *nbr)
{
  struct ospf_interface *oi = nbr->oi;

      /* These network types must always form adjacencies. */
  if (oi->type == OSPF_IFTYPE_POINTOPOINT
      || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT
      || oi->type == OSPF_IFTYPE_VIRTUALLINK
      /* Router itself is the DRouter or the BDRouter. */
      || IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi))
      || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi))
      /* Neighboring Router is the DRouter or the BDRouter. */
      || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi))
      || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi)))
    return 1;

  return 0;
}

void
ospf_abr_announce_rtr (struct ospf *ospf,
		       struct prefix_ipv4 *p, struct ospf_route *or)
{
  listnode node;
  struct ospf_area *area;

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

  for (node = listhead (ospf->areas); node; nextnode (node))
    {
      area = getdata (node);

      if (IS_DEBUG_OSPF_EVENT)
	zlog_info ("ospf_abr_announce_rtr(): looking at area %s",
		   inet_ntoa (area->area_id));

      if (IPV4_ADDR_SAME (&or->u.std.area_id, &area->area_id))
	continue;

      if (ospf_abr_nexthops_belong_to_area (or, area))
	continue;

      if (area->external_routing != OSPF_AREA_DEFAULT)
	{
	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_info ("ospf_abr_announce_network(): "
		       "area %s doesn't support external routing",
		       inet_ntoa(area->area_id));
          continue;
	}

      if (or->path_type == OSPF_PATH_INTER_AREA)
	{
	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_info ("ospf_abr_announce_rtr(): "
		       "this is inter-area route to %s", inet_ntoa (p->prefix));
          if (!OSPF_IS_AREA_BACKBONE (area))
	    ospf_abr_announce_rtr_to_area (p, or->cost, area);
	}

      if (or->path_type == OSPF_PATH_INTRA_AREA)
	{
	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_info ("ospf_abr_announce_rtr(): "
		       "this is intra-area route to %s", inet_ntoa (p->prefix));
          ospf_abr_announce_rtr_to_area (p, or->cost, area);
	}
    }

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