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/*
* BGP Multipath
* Copyright (C) 2010 Google Inc.
*
* This file is part of Quagga
*
* Quagga is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* Quagga is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _QUAGGA_BGP_MPATH_H
#define _QUAGGA_BGP_MPATH_H
/* Supplemental information linked to bgp_info for keeping track of
* multipath selections, lazily allocated to save memory
*/
struct bgp_info_mpath {
/* Points to the first multipath (on bestpath) or the next multipath */
struct bgp_info_mpath *mp_next;
/* Points to the previous multipath or NULL on bestpath */
struct bgp_info_mpath *mp_prev;
/* Points to bgp_info associated with this multipath info */
struct bgp_info *mp_info;
/* When attached to best path, the number of selected multipaths */
u_int32_t mp_count;
/* Aggregated attribute for advertising multipath route */
struct attr *mp_attr;
};
/* Functions to support maximum-paths configuration */
extern int bgp_maximum_paths_set(struct bgp *, afi_t, safi_t, int, u_int16_t,
u_int16_t);
extern int bgp_maximum_paths_unset(struct bgp *, afi_t, safi_t, int);
/* Functions used by bgp_best_selection to record current
* multipath selections
*/
extern int bgp_info_nexthop_cmp(struct bgp_info *bi1, struct bgp_info *bi2);
extern void bgp_mp_list_init(struct list *);
extern void bgp_mp_list_clear(struct list *);
extern void bgp_mp_list_add(struct list *, struct bgp_info *);
extern void bgp_mp_dmed_deselect(struct bgp_info *);
extern void bgp_info_mpath_update(struct bgp_node *, struct bgp_info *,
struct bgp_info *, struct list *,
struct bgp_maxpaths_cfg *);
extern void bgp_info_mpath_aggregate_update(struct bgp_info *,
struct bgp_info *);
/* Unlink and free multipath information associated with a bgp_info */
extern void bgp_info_mpath_dequeue(struct bgp_info *);
extern void bgp_info_mpath_free(struct bgp_info_mpath **);
/* Walk list of multipaths associated with a best path */
extern struct bgp_info *bgp_info_mpath_first(struct bgp_info *);
extern struct bgp_info *bgp_info_mpath_next(struct bgp_info *);
/* Accessors for multipath information */
extern u_int32_t bgp_info_mpath_count(struct bgp_info *);
extern struct attr *bgp_info_mpath_attr(struct bgp_info *);
#endif /* _QUAGGA_BGP_MPATH_H */
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