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