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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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _QUAGGA_BGP_MPATH_H
#define _QUAGGA_BGP_MPATH_H
/* Supplemental information linked to bgp_path_info for keeping track of
* multipath selections, lazily allocated to save memory
*/
struct bgp_path_info_mpath {
/* Points to the first multipath (on bestpath) or the next multipath */
struct bgp_path_info_mpath *mp_next;
/* Points to the previous multipath or NULL on bestpath */
struct bgp_path_info_mpath *mp_prev;
/* Points to bgp_path_info associated with this multipath info */
struct bgp_path_info *mp_info;
/* When attached to best path, the number of selected multipaths */
uint16_t mp_count;
/* Flags - relevant as noted. */
uint16_t mp_flags;
#define BGP_MP_LB_PRESENT 0x1 /* Link-bandwidth present for >= 1 path */
#define BGP_MP_LB_ALL 0x2 /* Link-bandwidth present for all multipaths */
/* Aggregated attribute for advertising multipath route */
struct attr *mp_attr;
/* Cumulative bandiwdth of all multipaths - attached to best path. */
uint64_t cum_bw;
};
/* Functions to support maximum-paths configuration */
extern int bgp_maximum_paths_set(struct bgp *, afi_t, safi_t, int, uint16_t,
uint16_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_path_info_nexthop_cmp(struct bgp_path_info *bpi1,
struct bgp_path_info *bpi2);
extern void bgp_mp_list_init(struct list *);
extern void bgp_mp_list_clear(struct list *);
extern void bgp_mp_list_add(struct list *mp_list, struct bgp_path_info *mpinfo);
extern void bgp_mp_dmed_deselect(struct bgp_path_info *dmed_best);
extern void bgp_path_info_mpath_update(struct bgp *bgp, struct bgp_dest *dest,
struct bgp_path_info *new_best,
struct bgp_path_info *old_best,
struct list *mp_list,
struct bgp_maxpaths_cfg *mpath_cfg);
extern void
bgp_path_info_mpath_aggregate_update(struct bgp_path_info *new_best,
struct bgp_path_info *old_best);
/* Unlink and free multipath information associated with a bgp_path_info */
extern void bgp_path_info_mpath_dequeue(struct bgp_path_info *path);
extern void bgp_path_info_mpath_free(struct bgp_path_info_mpath **mpath);
/* Walk list of multipaths associated with a best path */
extern struct bgp_path_info *
bgp_path_info_mpath_first(struct bgp_path_info *path);
extern struct bgp_path_info *
bgp_path_info_mpath_next(struct bgp_path_info *path);
/* Accessors for multipath information */
extern uint32_t bgp_path_info_mpath_count(struct bgp_path_info *path);
extern struct attr *bgp_path_info_mpath_attr(struct bgp_path_info *path);
extern bool bgp_path_info_mpath_chkwtd(struct bgp *bgp,
struct bgp_path_info *path);
extern uint64_t bgp_path_info_mpath_cumbw(struct bgp_path_info *path);
#endif /* _QUAGGA_BGP_MPATH_H */
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