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1 | /* | |
2 | * OSPF calculation. | |
3 | * Copyright (C) 1999 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra 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 | * GNU Zebra 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 | * | |
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 | |
20 | */ | |
21 | ||
22 | #ifndef _QUAGGA_OSPF_SPF_H | |
23 | #define _QUAGGA_OSPF_SPF_H | |
24 | ||
25 | #include "typesafe.h" | |
26 | ||
27 | /* values for vertex->type */ | |
28 | #define OSPF_VERTEX_ROUTER 1 /* for a Router-LSA */ | |
29 | #define OSPF_VERTEX_NETWORK 2 /* for a Network-LSA */ | |
30 | ||
31 | /* values for vertex->flags */ | |
32 | #define OSPF_VERTEX_PROCESSED 0x01 | |
33 | ||
34 | /* The "root" is the node running the SPF calculation */ | |
35 | ||
36 | PREDECL_SKIPLIST_NONUNIQ(vertex_pqueue); | |
37 | /* A router or network in an area */ | |
38 | struct vertex { | |
39 | struct vertex_pqueue_item pqi; | |
40 | uint8_t flags; | |
41 | uint8_t type; /* copied from LSA header */ | |
42 | struct in_addr id; /* copied from LSA header */ | |
43 | struct ospf_lsa *lsa_p; | |
44 | struct lsa_header *lsa; /* Router or Network LSA */ | |
45 | uint32_t distance; /* from root to this vertex */ | |
46 | struct list *parents; /* list of parents in SPF tree */ | |
47 | struct list *children; /* list of children in SPF tree*/ | |
48 | }; | |
49 | ||
50 | struct vertex_nexthop { | |
51 | struct in_addr router; /* router address to send to */ | |
52 | int lsa_pos; /* LSA position for resolving the interface */ | |
53 | }; | |
54 | ||
55 | struct vertex_parent { | |
56 | struct vertex_nexthop *nexthop; /* nexthop taken on the root node */ | |
57 | struct vertex_nexthop *local_nexthop; /* local nexthop of the parent */ | |
58 | struct vertex *parent; /* parent vertex */ | |
59 | int backlink; /* index back to parent for router-lsa's */ | |
60 | }; | |
61 | ||
62 | /* What triggered the SPF ? */ | |
63 | typedef enum { | |
64 | SPF_FLAG_ROUTER_LSA_INSTALL = 1, | |
65 | SPF_FLAG_NETWORK_LSA_INSTALL, | |
66 | SPF_FLAG_SUMMARY_LSA_INSTALL, | |
67 | SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL, | |
68 | SPF_FLAG_MAXAGE, | |
69 | SPF_FLAG_ABR_STATUS_CHANGE, | |
70 | SPF_FLAG_ASBR_STATUS_CHANGE, | |
71 | SPF_FLAG_CONFIG_CHANGE, | |
72 | SPF_FLAG_GR_FINISH, | |
73 | } ospf_spf_reason_t; | |
74 | ||
75 | extern void ospf_spf_calculate_schedule(struct ospf *, ospf_spf_reason_t); | |
76 | extern void ospf_spf_calculate(struct ospf_area *area, | |
77 | struct ospf_lsa *root_lsa, | |
78 | struct route_table *new_table, | |
79 | struct route_table *new_rtrs, bool is_dry_run, | |
80 | bool is_root_node); | |
81 | extern void ospf_spf_calculate_area(struct ospf *ospf, struct ospf_area *area, | |
82 | struct route_table *new_table, | |
83 | struct route_table *new_rtrs); | |
84 | extern void ospf_spf_calculate_areas(struct ospf *ospf, | |
85 | struct route_table *new_table, | |
86 | struct route_table *new_rtrs); | |
87 | extern void ospf_rtrs_free(struct route_table *); | |
88 | extern void ospf_spf_cleanup(struct vertex *spf, struct list *vertex_list); | |
89 | extern void ospf_spf_copy(struct vertex *vertex, struct list *vertex_list); | |
90 | extern void ospf_spf_remove_resource(struct vertex *vertex, | |
91 | struct list *vertex_list, | |
92 | struct protected_resource *resource); | |
93 | extern struct vertex *ospf_spf_vertex_find(struct in_addr id, | |
94 | struct list *vertex_list); | |
95 | extern struct vertex *ospf_spf_vertex_by_nexthop(struct vertex *root, | |
96 | struct in_addr *nexthop); | |
97 | extern struct vertex_parent *ospf_spf_vertex_parent_find(struct in_addr id, | |
98 | struct vertex *vertex); | |
99 | extern int vertex_parent_cmp(void *aa, void *bb); | |
100 | ||
101 | extern void ospf_spf_print(struct vty *vty, struct vertex *v, int i); | |
102 | extern void ospf_restart_spf(struct ospf *ospf); | |
103 | /* void ospf_spf_calculate_timer_add (); */ | |
104 | #endif /* _QUAGGA_OSPF_SPF_H */ |