bgp_route.c

大名鼎鼎的路由器源码。程序分ZEBRA、OSPFRIP等3个包。程序框架采用一个路由协议一个进程的方式

    {
      vty_out (vty, "%% Malformed prefix%s", VTY_NEWLINE);
      return CMD_WARNING;
    }
#ifdef HAVE_IPV6
  if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
    {
      vty_out (vty, "%% Malformed prefix (link-local address)%s",
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
#endif /* HAVE_IPV6 */

  apply_mask (&p);

  /* Set BGP static route configuration. */
  rn = bgp_node_get (bgp->route[afi][safi], &p);

  if (rn->info)
    {
      /* Configuration change. */
      bgp_static = rn->info;

      /* Check previous routes are installed into BGP.  */
      if (! bgp_static->backdoor && bgp_static->valid)
	need_update = 1;

      bgp_static->backdoor = backdoor;
      if (rmap)
	{
	  if (bgp_static->rmap.name)
	    free (bgp_static->rmap.name);
	  bgp_static->rmap.name = strdup (rmap);
	  bgp_static->rmap.map = route_map_lookup_by_name (rmap);
	}
      else
	{
	  if (bgp_static->rmap.name)
	    free (bgp_static->rmap.name);
	  bgp_static->rmap.name = NULL;
	  bgp_static->rmap.map = NULL;
	  bgp_static->valid = 0;
	}
      bgp_unlock_node (rn);
    }
  else
    {
      /* New configuration. */
      bgp_static = bgp_static_new ();
      bgp_static->backdoor = backdoor;
      bgp_static->valid = 0;
      bgp_static->igpmetric = 0;
      bgp_static->igpnexthop.s_addr = 0;
      if (rmap)
	{
	  if (bgp_static->rmap.name)
	    free (bgp_static->rmap.name);
	  bgp_static->rmap.name = strdup (rmap);
	  bgp_static->rmap.map = route_map_lookup_by_name (rmap);
	}
      rn->info = bgp_static;
    }

  /* If BGP scan is not enabled, we should install this route here.  */
  if (! bgp_flag_check (bgp, BGP_FLAG_IMPORT_CHECK))
    {
      bgp_static->valid = 1;

      if (need_update)
	bgp_static_withdraw (bgp, &p, afi, safi);

      if (! bgp_static->backdoor)
	bgp_static_update (bgp, &p, bgp_static, afi, safi);
    }

  return CMD_SUCCESS;
}

/* Configure static BGP network. */
int
bgp_static_unset (struct vty *vty, struct bgp *bgp, char *ip_str,
		  u_int16_t afi, u_char safi)
{
  int ret;
  struct prefix p;
  struct bgp_static *bgp_static;
  struct bgp_node *rn;

  /* Convert IP prefix string to struct prefix. */
  ret = str2prefix (ip_str, &p);
  if (! ret)
    {
      vty_out (vty, "%% Malformed prefix%s", VTY_NEWLINE);
      return CMD_WARNING;
    }
#ifdef HAVE_IPV6
  if (afi == AFI_IP6 && IN6_IS_ADDR_LINKLOCAL (&p.u.prefix6))
    {
      vty_out (vty, "%% Malformed prefix (link-local address)%s",
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
#endif /* HAVE_IPV6 */

  apply_mask (&p);

  rn = bgp_node_lookup (bgp->route[afi][safi], &p);
  if (! rn)
    {
      vty_out (vty, "%% Can't find specified static route configuration.%s",
	       VTY_NEWLINE);
      return CMD_WARNING;
    }

  bgp_static = rn->info;

  /* Update BGP RIB. */
  if (! bgp_static->backdoor)
    bgp_static_withdraw (bgp, &p, afi, safi);

  /* Clear configuration. */
  bgp_static_free (bgp_static);
  rn->info = NULL;
  bgp_unlock_node (rn);
  bgp_unlock_node (rn);

  return CMD_SUCCESS;
}

/* Called from bgp_delete().  Delete all static routes from the BGP
   instance. */
void
bgp_static_delete (struct bgp *bgp)
{
  afi_t afi;
  safi_t safi;
  struct bgp_node *rn;
  struct bgp_node *rm;
  struct bgp_table *table;
  struct bgp_static *bgp_static;

  for (afi = AFI_IP; afi < AFI_MAX; afi++)
    for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++)
      for (rn = bgp_table_top (bgp->route[afi][safi]); rn; rn = bgp_route_next (rn))
	if (rn->info != NULL)
	  {      
	    if (safi == SAFI_MPLS_VPN)
	      {
		table = rn->info;

		for (rm = bgp_table_top (table); rm; rm = bgp_route_next (rm))
		  {
		    bgp_static = rn->info;
		    bgp_static_withdraw_vpnv4 (bgp, &rm->p,
					       AFI_IP, SAFI_MPLS_VPN,
					       (struct prefix_rd *)&rn->p,
					       bgp_static->tag);
		    bgp_static_free (bgp_static);
		    rn->info = NULL;
		    bgp_unlock_node (rn);
		  }
	      }
	    else
	      {
		bgp_static = rn->info;
		bgp_static_withdraw (bgp, &rn->p, afi, safi);
		bgp_static_free (bgp_static);
		rn->info = NULL;
		bgp_unlock_node (rn);
	      }
	  }
}

int
bgp_static_set_vpnv4 (struct vty *vty, char *ip_str, char *rd_str,
		      char *tag_str)
{
  int ret;
  struct prefix p;
  struct prefix_rd prd;
  struct bgp *bgp;
  struct bgp_node *prn;
  struct bgp_node *rn;
  struct bgp_table *table;
  struct bgp_static *bgp_static;
  u_char tag[3];

  bgp = vty->index;

  ret = str2prefix (ip_str, &p);
  if (! ret)
    {
      vty_out (vty, "%% Malformed prefix%s", VTY_NEWLINE);
      return CMD_WARNING;
    }
  apply_mask (&p);

  ret = str2prefix_rd (rd_str, &prd);
  if (! ret)
    {
      vty_out (vty, "%% Malformed rd%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  ret = str2tag (tag_str, tag);
  if (! ret)
    {
      vty_out (vty, "%% Malformed tag%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  prn = bgp_node_get (bgp->route[AFI_IP][SAFI_MPLS_VPN],
			(struct prefix *)&prd);
  if (prn->info == NULL)
    prn->info = bgp_table_init ();
  else
    bgp_unlock_node (prn);
  table = prn->info;

  rn = bgp_node_get (table, &p);

  if (rn->info)
    {
      vty_out (vty, "%% Same network configuration exists%s", VTY_NEWLINE);
      bgp_unlock_node (rn);
    }
  else
    {
      /* New configuration. */
      bgp_static = bgp_static_new ();
      bgp_static->valid = 1;
      memcpy (bgp_static->tag, tag, 3);
      rn->info = bgp_static;

      bgp_static_update_vpnv4 (bgp, &p, AFI_IP, SAFI_MPLS_VPN, &prd, tag);
    }

  return CMD_SUCCESS;
}

/* Configure static BGP network. */
int
bgp_static_unset_vpnv4 (struct vty *vty, char *ip_str, char *rd_str,
			char *tag_str)
{
  int ret;
  struct bgp *bgp;
  struct prefix p;
  struct prefix_rd prd;
  struct bgp_node *prn;
  struct bgp_node *rn;
  struct bgp_table *table;
  struct bgp_static *bgp_static;
  u_char tag[3];

  bgp = vty->index;

  /* Convert IP prefix string to struct prefix. */
  ret = str2prefix (ip_str, &p);
  if (! ret)
    {
      vty_out (vty, "%% Malformed prefix%s", VTY_NEWLINE);
      return CMD_WARNING;
    }
  apply_mask (&p);

  ret = str2prefix_rd (rd_str, &prd);
  if (! ret)
    {
      vty_out (vty, "%% Malformed rd%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  ret = str2tag (tag_str, tag);
  if (! ret)
    {
      vty_out (vty, "%% Malformed tag%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  prn = bgp_node_get (bgp->route[AFI_IP][SAFI_MPLS_VPN],
			(struct prefix *)&prd);
  if (prn->info == NULL)
    prn->info = bgp_table_init ();
  else
    bgp_unlock_node (prn);
  table = prn->info;

  rn = bgp_node_lookup (table, &p);

  if (rn)
    {
      bgp_static_withdraw_vpnv4 (bgp, &p, AFI_IP, SAFI_MPLS_VPN, &prd, tag);

      bgp_static = rn->info;
      bgp_static_free (bgp_static);
      rn->info = NULL;
      bgp_unlock_node (rn);
      bgp_unlock_node (rn);
    }
  else
    vty_out (vty, "%% Can't find the route%s", VTY_NEWLINE);

  return CMD_SUCCESS;
}

DEFUN (bgp_network,
       bgp_network_cmd,
       "network A.B.C.D/M",
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n")
{
  return bgp_static_set (vty, vty->index, argv[0],
			 AFI_IP, bgp_node_safi (vty), NULL, 0);
}

DEFUN (bgp_network_route_map,
       bgp_network_route_map_cmd,
       "network A.B.C.D/M route-map WORD",
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
       "Route-map to modify the attributes\n"
       "Name of the route map\n")
{
  return bgp_static_set (vty, vty->index, argv[0],
			 AFI_IP, bgp_node_safi (vty), argv[1], 0);
}

DEFUN (bgp_network_backdoor,
       bgp_network_backdoor_cmd,
       "network A.B.C.D/M backdoor",
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
       "Specify a BGP backdoor route\n")
{
  return bgp_static_set (vty, vty->index, argv[0], AFI_IP, SAFI_UNICAST, NULL, 1);
}

DEFUN (bgp_network_mask,
       bgp_network_mask_cmd,
       "network A.B.C.D mask A.B.C.D",
       "Specify a network to announce via BGP\n"
       "Network number\n"
       "Network mask\n"
       "Network mask\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], argv[1], prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str,
			 AFI_IP, bgp_node_safi (vty), NULL, 0);
}

DEFUN (bgp_network_mask_route_map,
       bgp_network_mask_route_map_cmd,
       "network A.B.C.D mask A.B.C.D route-map WORD",
       "Specify a network to announce via BGP\n"
       "Network number\n"
       "Network mask\n"
       "Network mask\n"
       "Route-map to modify the attributes\n"
       "Name of the route map\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], argv[1], prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str,
			 AFI_IP, bgp_node_safi (vty), argv[2], 0);
}

DEFUN (bgp_network_mask_backdoor,
       bgp_network_mask_backdoor_cmd,
       "network A.B.C.D mask A.B.C.D backdoor",
       "Specify a network to announce via BGP\n"
       "Network number\n"
       "Network mask\n"
       "Network mask\n"
       "Specify a BGP backdoor route\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], argv[1], prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str, AFI_IP, SAFI_UNICAST, NULL, 1);
}

DEFUN (bgp_network_mask_natural,
       bgp_network_mask_natural_cmd,
       "network A.B.C.D",
       "Specify a network to announce via BGP\n"
       "Network number\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], NULL, prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str,
			 AFI_IP, bgp_node_safi (vty), NULL, 0);
}

DEFUN (bgp_network_mask_natural_route_map,
       bgp_network_mask_natural_route_map_cmd,
       "network A.B.C.D route-map WORD",
       "Specify a network to announce via BGP\n"
       "Network number\n"
       "Route-map to modify the attributes\n"
       "Name of the route map\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], NULL, prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str,
			 AFI_IP, bgp_node_safi (vty), argv[1], 0);
}

DEFUN (bgp_network_mask_natural_backdoor,
       bgp_network_mask_natural_backdoor_cmd,
       "network A.B.C.D backdoor",
       "Specify a network to announce via BGP\n"
       "Network number\n"
       "Specify a BGP backdoor route\n")
{
  int ret;
  char prefix_str[BUFSIZ];

  ret = netmask_str2prefix_str (argv[0], NULL, prefix_str);
  if (! ret)
    {
      vty_out (vty, "%% Inconsistent address and mask%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return bgp_static_set (vty, vty->index, prefix_str, AFI_IP, SAFI_UNICAST, NULL, 1);
}

DEFUN (no_bgp_network,
       no_bgp_network_cmd,
       "no network A.B.C.D/M",
       NO_STR
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n")
{
  return bgp_static_unset (vty, vty->index, argv[0], AFI_IP, 
			   bgp_node_safi (vty));
}

ALIAS (no_bgp_network,
       no_bgp_network_route_map_cmd,
       "no network A.B.C.D/M route-map WORD",
       NO_STR
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
       "Route-map to modify the attributes\n"
       "Name of the route map\n");

ALIAS (no_bgp_network,
       no_bgp_network_backdoor_cmd,
       "no network A.B.C.D/M backdoor",
       NO_STR
       "Specify a network to announce via BGP\n"
       "IP prefix <network>/<length>, e.g., 35.0.0.0/8\n"
       "Specify a BGP backdoor route\n");

DEFUN (no_bgp_network_mask,
       no_bgp_network_mask_cmd,
       "no network A.B.C.D mask A.B.C.D",
       NO_STR
       "Specify a network to announce via BGP\n"
       "Network number\n"