| Josh Bailey | 165b5ff | 2011-07-20 20:43:22 -0700 | [diff] [blame] | 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 | |
| Josh Bailey | de8d5df | 2011-07-20 20:46:01 -0700 | [diff] [blame] | 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 | |
| Josh Bailey | 165b5ff | 2011-07-20 20:43:22 -0700 | [diff] [blame] | 48 | /* Functions to support maximum-paths configuration */ |
| 49 | extern int bgp_maximum_paths_set (struct bgp *, afi_t, safi_t, int, u_int16_t); |
| 50 | extern int bgp_maximum_paths_unset (struct bgp *, afi_t, safi_t, int); |
| 51 | |
| Josh Bailey | 96450fa | 2011-07-20 20:45:12 -0700 | [diff] [blame] | 52 | /* Functions used by bgp_best_selection to record current |
| 53 | * multipath selections |
| 54 | */ |
| 55 | extern void bgp_mp_list_init (struct list *); |
| 56 | extern void bgp_mp_list_clear (struct list *); |
| 57 | extern void bgp_mp_list_add (struct list *, struct bgp_info *); |
| Josh Bailey | de8d5df | 2011-07-20 20:46:01 -0700 | [diff] [blame] | 58 | extern void bgp_info_mpath_update (struct bgp_node *, struct bgp_info *, |
| 59 | struct bgp_info *, struct list *, |
| 60 | struct bgp_maxpaths_cfg *); |
| 61 | |
| 62 | /* Unlink and free multipath information associated with a bgp_info */ |
| 63 | extern void bgp_info_mpath_dequeue (struct bgp_info *); |
| 64 | extern void bgp_info_mpath_free (struct bgp_info_mpath **); |
| 65 | |
| 66 | /* Walk list of multipaths associated with a best path */ |
| 67 | extern struct bgp_info *bgp_info_mpath_first (struct bgp_info *); |
| 68 | extern struct bgp_info *bgp_info_mpath_next (struct bgp_info *); |
| 69 | |
| 70 | /* Accessors for multipath information */ |
| 71 | extern u_int32_t bgp_info_mpath_count (struct bgp_info *); |
| Josh Bailey | 96450fa | 2011-07-20 20:45:12 -0700 | [diff] [blame] | 72 | |
| Josh Bailey | 165b5ff | 2011-07-20 20:43:22 -0700 | [diff] [blame] | 73 | #endif /* _QUAGGA_BGP_MPATH_H */ |