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Annotation of embedaddon/quagga/bgpd/bgp_mpath.h, revision 1.1.1.1

1.1       misho       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: 
                     55: /* Functions used by bgp_best_selection to record current
                     56:  * multipath selections
                     57:  */
                     58: extern void bgp_mp_list_init (struct list *);
                     59: extern void bgp_mp_list_clear (struct list *);
                     60: extern void bgp_mp_list_add (struct list *, struct bgp_info *);
                     61: extern void bgp_mp_dmed_deselect (struct bgp_info *);
                     62: extern void bgp_info_mpath_update (struct bgp_node *, struct bgp_info *,
                     63:                                    struct bgp_info *, struct list *,
                     64:                                    struct bgp_maxpaths_cfg *);
                     65: extern void bgp_info_mpath_aggregate_update (struct bgp_info *,
                     66:                                              struct bgp_info *);
                     67: 
                     68: /* Unlink and free multipath information associated with a bgp_info */
                     69: extern void bgp_info_mpath_dequeue (struct bgp_info *);
                     70: extern void bgp_info_mpath_free (struct bgp_info_mpath **);
                     71: 
                     72: /* Walk list of multipaths associated with a best path */
                     73: extern struct bgp_info *bgp_info_mpath_first (struct bgp_info *);
                     74: extern struct bgp_info *bgp_info_mpath_next (struct bgp_info *);
                     75: 
                     76: /* Accessors for multipath information */
                     77: extern u_int32_t bgp_info_mpath_count (struct bgp_info *);
                     78: extern struct attr *bgp_info_mpath_attr (struct bgp_info *);
                     79: 
                     80: #endif /* _QUAGGA_BGP_MPATH_H */