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8ef0791c | 1 | /* |
165b5fff JB |
2 | * BGP Multipath |
3 | * Copyright (C) 2010 Google Inc. | |
4 | * | |
5 | * This file is part of Quagga | |
6 | * | |
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 | |
10 | * later version. | |
11 | * | |
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. | |
16 | * | |
896014f4 DL |
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 | |
165b5fff JB |
20 | */ |
21 | ||
22 | #ifndef _QUAGGA_BGP_MPATH_H | |
23 | #define _QUAGGA_BGP_MPATH_H | |
24 | ||
18ee8310 | 25 | /* Supplemental information linked to bgp_path_info for keeping track of |
de8d5dff JB |
26 | * multipath selections, lazily allocated to save memory |
27 | */ | |
4b7e6066 | 28 | struct bgp_path_info_mpath { |
d62a17ae | 29 | /* Points to the first multipath (on bestpath) or the next multipath */ |
4b7e6066 | 30 | struct bgp_path_info_mpath *mp_next; |
de8d5dff | 31 | |
d62a17ae | 32 | /* Points to the previous multipath or NULL on bestpath */ |
4b7e6066 | 33 | struct bgp_path_info_mpath *mp_prev; |
de8d5dff | 34 | |
18ee8310 | 35 | /* Points to bgp_path_info associated with this multipath info */ |
4b7e6066 | 36 | struct bgp_path_info *mp_info; |
de8d5dff | 37 | |
d62a17ae | 38 | /* When attached to best path, the number of selected multipaths */ |
50346a98 | 39 | uint16_t mp_count; |
40 | ||
41 | /* Flags - relevant as noted. */ | |
42 | uint16_t mp_flags; | |
f7e1c681 | 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 */ | |
0b597ef0 | 45 | |
d62a17ae | 46 | /* Aggregated attribute for advertising multipath route */ |
47 | struct attr *mp_attr; | |
50346a98 | 48 | |
49 | /* Cumulative bandiwdth of all multipaths - attached to best path. */ | |
50 | uint64_t cum_bw; | |
de8d5dff JB |
51 | }; |
52 | ||
165b5fff | 53 | /* Functions to support maximum-paths configuration */ |
d7c0a89a QY |
54 | extern int bgp_maximum_paths_set(struct bgp *, afi_t, safi_t, int, uint16_t, |
55 | uint16_t); | |
d62a17ae | 56 | extern int bgp_maximum_paths_unset(struct bgp *, afi_t, safi_t, int); |
165b5fff | 57 | |
96450faf JB |
58 | /* Functions used by bgp_best_selection to record current |
59 | * multipath selections | |
60 | */ | |
40381db7 DS |
61 | extern int bgp_path_info_nexthop_cmp(struct bgp_path_info *bpi1, |
62 | struct bgp_path_info *bpi2); | |
d62a17ae | 63 | extern void bgp_mp_list_init(struct list *); |
64 | extern void bgp_mp_list_clear(struct list *); | |
4b7e6066 DS |
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); | |
4378495a | 67 | extern void bgp_path_info_mpath_update(struct bgp *bgp, struct bgp_dest *dest, |
18ee8310 DS |
68 | struct bgp_path_info *new_best, |
69 | struct bgp_path_info *old_best, | |
70 | struct list *mp_list, | |
71 | struct bgp_maxpaths_cfg *mpath_cfg); | |
72 | extern void | |
73 | bgp_path_info_mpath_aggregate_update(struct bgp_path_info *new_best, | |
74 | struct bgp_path_info *old_best); | |
de8d5dff | 75 | |
18ee8310 DS |
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); | |
de8d5dff JB |
79 | |
80 | /* Walk list of multipaths associated with a best path */ | |
18ee8310 DS |
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); | |
de8d5dff JB |
85 | |
86 | /* Accessors for multipath information */ | |
18ee8310 DS |
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); | |
f7e1c681 | 89 | extern bool bgp_path_info_mpath_chkwtd(struct bgp *bgp, |
90 | struct bgp_path_info *path); | |
4e30bc2b | 91 | extern uint64_t bgp_path_info_mpath_cumbw(struct bgp_path_info *path); |
96450faf | 92 | |
165b5fff | 93 | #endif /* _QUAGGA_BGP_MPATH_H */ |