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3 * Copyright (C) 2010 Google Inc.
5 * This file is part of Quagga
7 * Quagga is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
12 * Quagga is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; see the file COPYING; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef _QUAGGA_BGP_MPATH_H
23 #define _QUAGGA_BGP_MPATH_H
25 /* Supplemental information linked to bgp_path_info for keeping track of
26 * multipath selections, lazily allocated to save memory
28 struct bgp_path_info_mpath
{
29 /* Points to the first multipath (on bestpath) or the next multipath */
30 struct bgp_path_info_mpath
*mp_next
;
32 /* Points to the previous multipath or NULL on bestpath */
33 struct bgp_path_info_mpath
*mp_prev
;
35 /* Points to bgp_path_info associated with this multipath info */
36 struct bgp_path_info
*mp_info
;
38 /* When attached to best path, the number of selected multipaths */
41 /* Flags - relevant as noted. */
43 #define BGP_MP_LB_PRESENT 0x1 /* Link-bandwidth present for >= 1 path */
44 #define BGP_MP_LB_ALL 0x2 /* Link-bandwidth present for all multipaths */
46 /* Aggregated attribute for advertising multipath route */
49 /* Cumulative bandiwdth of all multipaths - attached to best path. */
53 /* Functions to support maximum-paths configuration */
54 extern int bgp_maximum_paths_set(struct bgp
*, afi_t
, safi_t
, int, uint16_t,
56 extern int bgp_maximum_paths_unset(struct bgp
*, afi_t
, safi_t
, int);
58 /* Functions used by bgp_best_selection to record current
59 * multipath selections
61 extern int bgp_path_info_nexthop_cmp(struct bgp_path_info
*bpi1
,
62 struct bgp_path_info
*bpi2
);
63 extern void bgp_mp_list_init(struct list
*);
64 extern void bgp_mp_list_clear(struct list
*);
65 extern void bgp_mp_list_add(struct list
*mp_list
, struct bgp_path_info
*mpinfo
);
66 extern void bgp_mp_dmed_deselect(struct bgp_path_info
*dmed_best
);
67 extern void bgp_path_info_mpath_update(struct bgp
*bgp
, struct bgp_dest
*dest
,
68 struct bgp_path_info
*new_best
,
69 struct bgp_path_info
*old_best
,
71 struct bgp_maxpaths_cfg
*mpath_cfg
);
73 bgp_path_info_mpath_aggregate_update(struct bgp_path_info
*new_best
,
74 struct bgp_path_info
*old_best
);
76 /* Unlink and free multipath information associated with a bgp_path_info */
77 extern void bgp_path_info_mpath_dequeue(struct bgp_path_info
*path
);
78 extern void bgp_path_info_mpath_free(struct bgp_path_info_mpath
**mpath
);
80 /* Walk list of multipaths associated with a best path */
81 extern struct bgp_path_info
*
82 bgp_path_info_mpath_first(struct bgp_path_info
*path
);
83 extern struct bgp_path_info
*
84 bgp_path_info_mpath_next(struct bgp_path_info
*path
);
86 /* Accessors for multipath information */
87 extern uint32_t bgp_path_info_mpath_count(struct bgp_path_info
*path
);
88 extern struct attr
*bgp_path_info_mpath_attr(struct bgp_path_info
*path
);
89 extern bool bgp_path_info_mpath_chkwtd(struct bgp
*bgp
,
90 struct bgp_path_info
*path
);
91 extern uint64_t bgp_path_info_mpath_cumbw(struct bgp_path_info
*path
);
93 #endif /* _QUAGGA_BGP_MPATH_H */