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quagga 1.0.20160315

    1: /* $QuaggaId: Format:%an, %ai, %h$ $
    2:  *
    3:  * BGP Multipath
    4:  * Copyright (C) 2010 Google Inc.
    5:  *
    6:  * This file is part of Quagga
    7:  *
    8:  * Quagga is free software; you can redistribute it and/or modify it
    9:  * under the terms of the GNU General Public License as published by the
   10:  * Free Software Foundation; either version 2, or (at your option) any
   11:  * later version.
   12:  *
   13:  * Quagga is distributed in the hope that it will be useful, but
   14:  * WITHOUT ANY WARRANTY; without even the implied warranty of
   15:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   16:  * General Public License for more details.
   17:  *
   18:  * You should have received a copy of the GNU General Public License
   19:  * along with Quagga; see the file COPYING.  If not, write to the Free
   20:  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   21:  * 02111-1307, USA.
   22:  */
   23: 
   24: #ifndef _QUAGGA_BGP_MPATH_H
   25: #define _QUAGGA_BGP_MPATH_H
   26: 
   27: /* BGP default maximum-paths */
   28: #define BGP_DEFAULT_MAXPATHS 1
   29: 
   30: /* Supplemental information linked to bgp_info for keeping track of
   31:  * multipath selections, lazily allocated to save memory
   32:  */
   33: struct bgp_info_mpath
   34: {
   35:   /* Points to the first multipath (on bestpath) or the next multipath */
   36:   struct bgp_info_mpath *mp_next;
   37: 
   38:   /* Points to the previous multipath or NULL on bestpath */
   39:   struct bgp_info_mpath *mp_prev;
   40: 
   41:   /* Points to bgp_info associated with this multipath info */
   42:   struct bgp_info *mp_info;
   43: 
   44:   /* When attached to best path, the number of selected multipaths */
   45:   u_int32_t mp_count;
   46: 
   47:   /* Aggregated attribute for advertising multipath route */
   48:   struct attr *mp_attr;
   49: };
   50: 
   51: /* Functions to support maximum-paths configuration */
   52: extern int bgp_maximum_paths_set (struct bgp *, afi_t, safi_t, int, u_int16_t);
   53: extern int bgp_maximum_paths_unset (struct bgp *, afi_t, safi_t, int);
   54: bool bgp_mpath_is_configured_sort (struct bgp *, bgp_peer_sort_t, afi_t, safi_t);
   55: bool bgp_mpath_is_configured (struct bgp *, afi_t, safi_t);
   56: 
   57: /* Functions used by bgp_best_selection to record current
   58:  * multipath selections
   59:  */
   60: extern void bgp_mp_list_init (struct list *);
   61: extern void bgp_mp_list_clear (struct list *);
   62: extern void bgp_mp_list_add (struct list *, struct bgp_info *);
   63: extern void bgp_mp_dmed_deselect (struct bgp_info *);
   64: extern void bgp_info_mpath_update (struct bgp_node *, struct bgp_info *,
   65:                                    struct bgp_info *, struct list *,
   66:                                    afi_t, safi_t);
   67: extern void bgp_info_mpath_aggregate_update (struct bgp_info *,
   68:                                              struct bgp_info *);
   69: 
   70: /* Unlink and free multipath information associated with a bgp_info */
   71: extern void bgp_info_mpath_dequeue (struct bgp_info *);
   72: extern void bgp_info_mpath_free (struct bgp_info_mpath **);
   73: 
   74: /* Walk list of multipaths associated with a best path */
   75: extern struct bgp_info *bgp_info_mpath_first (struct bgp_info *);
   76: extern struct bgp_info *bgp_info_mpath_next (struct bgp_info *);
   77: 
   78: /* Accessors for multipath information */
   79: extern u_int32_t bgp_info_mpath_count (struct bgp_info *);
   80: extern struct attr *bgp_info_mpath_attr (struct bgp_info *);
   81: 
   82: #endif /* _QUAGGA_BGP_MPATH_H */