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718e3744 | 1 | /* |
2 | * OSPF Link State Advertisement | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
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 | * | |
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 | |
718e3744 | 20 | */ |
21 | ||
22 | #ifndef _ZEBRA_OSPF_LSA_H | |
23 | #define _ZEBRA_OSPF_LSA_H | |
24 | ||
4dadc291 | 25 | #include "stream.h" |
26 | ||
718e3744 | 27 | /* OSPF LSA Range definition. */ |
28 | #define OSPF_MIN_LSA 1 /* begin range here */ | |
718e3744 | 29 | #define OSPF_MAX_LSA 12 |
718e3744 | 30 | |
31 | /* OSPF LSA Type definition. */ | |
32 | #define OSPF_UNKNOWN_LSA 0 | |
33 | #define OSPF_ROUTER_LSA 1 | |
34 | #define OSPF_NETWORK_LSA 2 | |
35 | #define OSPF_SUMMARY_LSA 3 | |
36 | #define OSPF_ASBR_SUMMARY_LSA 4 | |
37 | #define OSPF_AS_EXTERNAL_LSA 5 | |
38 | #define OSPF_GROUP_MEMBER_LSA 6 /* Not supported. */ | |
39 | #define OSPF_AS_NSSA_LSA 7 | |
40 | #define OSPF_EXTERNAL_ATTRIBUTES_LSA 8 /* Not supported. */ | |
41 | #define OSPF_OPAQUE_LINK_LSA 9 | |
42 | #define OSPF_OPAQUE_AREA_LSA 10 | |
43 | #define OSPF_OPAQUE_AS_LSA 11 | |
44 | ||
779adb01 | 45 | #define OSPF_LSA_HEADER_SIZE 20U |
46 | #define OSPF_ROUTER_LSA_LINK_SIZE 12U | |
05b7709d | 47 | #define OSPF_ROUTER_LSA_TOS_SIZE 4U |
779adb01 | 48 | #define OSPF_MAX_LSA_SIZE 1500U |
718e3744 | 49 | |
50 | /* AS-external-LSA refresh method. */ | |
51 | #define LSA_REFRESH_IF_CHANGED 0 | |
52 | #define LSA_REFRESH_FORCE 1 | |
53 | ||
54 | /* OSPF LSA header. */ | |
d62a17ae | 55 | struct lsa_header { |
56 | u_int16_t ls_age; | |
57 | u_char options; | |
58 | u_char type; | |
59 | struct in_addr id; | |
60 | struct in_addr adv_router; | |
61 | u_int32_t ls_seqnum; | |
62 | u_int16_t checksum; | |
63 | u_int16_t length; | |
718e3744 | 64 | }; |
65 | ||
66 | /* OSPF LSA. */ | |
d62a17ae | 67 | struct ospf_lsa { |
68 | /* LSA origination flag. */ | |
69 | u_char flags; | |
718e3744 | 70 | #define OSPF_LSA_SELF 0x01 |
71 | #define OSPF_LSA_SELF_CHECKED 0x02 | |
72 | #define OSPF_LSA_RECEIVED 0x04 | |
73 | #define OSPF_LSA_APPROVED 0x08 | |
74 | #define OSPF_LSA_DISCARD 0x10 | |
718e3744 | 75 | #define OSPF_LSA_LOCAL_XLT 0x20 |
7ddf1d6e | 76 | #define OSPF_LSA_PREMATURE_AGE 0x40 |
3106a032 | 77 | #define OSPF_LSA_IN_MAXAGE 0x80 |
718e3744 | 78 | |
d62a17ae | 79 | /* LSA data. */ |
80 | struct lsa_header *data; | |
718e3744 | 81 | |
d62a17ae | 82 | /* Received time stamp. */ |
83 | struct timeval tv_recv; | |
718e3744 | 84 | |
d62a17ae | 85 | /* Last time it was originated */ |
86 | struct timeval tv_orig; | |
718e3744 | 87 | |
d62a17ae | 88 | /* All of reference count, also lock to remove. */ |
89 | int lock; | |
718e3744 | 90 | |
d62a17ae | 91 | /* Flags for the SPF calculation. */ |
92 | int stat; | |
93 | #define LSA_SPF_NOT_EXPLORED -1 | |
94 | #define LSA_SPF_IN_SPFTREE -2 | |
95 | /* If stat >= 0, stat is LSA position in candidates heap. */ | |
718e3744 | 96 | |
d62a17ae | 97 | /* References to this LSA in neighbor retransmission lists*/ |
98 | int retransmit_counter; | |
718e3744 | 99 | |
d62a17ae | 100 | /* Area the LSA belongs to, may be NULL if AS-external-LSA. */ |
101 | struct ospf_area *area; | |
718e3744 | 102 | |
d62a17ae | 103 | /* Parent LSDB. */ |
104 | struct ospf_lsdb *lsdb; | |
718e3744 | 105 | |
d62a17ae | 106 | /* Related Route. */ |
107 | void *route; | |
108 | ||
109 | /* Refreshement List or Queue */ | |
110 | int refresh_list; | |
111 | ||
112 | /* For Type-9 Opaque-LSAs */ | |
113 | struct ospf_interface *oi; | |
718e3744 | 114 | }; |
115 | ||
116 | /* OSPF LSA Link Type. */ | |
117 | #define LSA_LINK_TYPE_POINTOPOINT 1 | |
118 | #define LSA_LINK_TYPE_TRANSIT 2 | |
119 | #define LSA_LINK_TYPE_STUB 3 | |
120 | #define LSA_LINK_TYPE_VIRTUALLINK 4 | |
121 | ||
122 | /* OSPF Router LSA Flag. */ | |
123 | #define ROUTER_LSA_BORDER 0x01 /* The router is an ABR */ | |
124 | #define ROUTER_LSA_EXTERNAL 0x02 /* The router is an ASBR */ | |
125 | #define ROUTER_LSA_VIRTUAL 0x04 /* The router has a VL in this area */ | |
0c9491b3 | 126 | #define ROUTER_LSA_NT 0x10 /* The routers always translates Type-7 */ |
718e3744 | 127 | #define ROUTER_LSA_SHORTCUT 0x20 /* Shortcut-ABR specific flag */ |
128 | ||
129 | #define IS_ROUTER_LSA_VIRTUAL(x) ((x)->flags & ROUTER_LSA_VIRTUAL) | |
130 | #define IS_ROUTER_LSA_EXTERNAL(x) ((x)->flags & ROUTER_LSA_EXTERNAL) | |
131 | #define IS_ROUTER_LSA_BORDER(x) ((x)->flags & ROUTER_LSA_BORDER) | |
132 | #define IS_ROUTER_LSA_SHORTCUT(x) ((x)->flags & ROUTER_LSA_SHORTCUT) | |
0c9491b3 | 133 | #define IS_ROUTER_LSA_NT(x) ((x)->flags & ROUTER_LSA_NT) |
718e3744 | 134 | |
135 | /* OSPF Router-LSA Link information. */ | |
d62a17ae | 136 | struct router_lsa_link { |
137 | struct in_addr link_id; | |
138 | struct in_addr link_data; | |
139 | struct { | |
140 | u_char type; | |
141 | u_char tos_count; | |
142 | u_int16_t metric; | |
143 | } m[1]; | |
718e3744 | 144 | }; |
145 | ||
146 | /* OSPF Router-LSAs structure. */ | |
a25a44db DO |
147 | #define OSPF_ROUTER_LSA_MIN_SIZE 4U /* w/0 link descriptors */ |
148 | /* There is an edge case, when number of links in a Router-LSA may be 0 without | |
149 | breaking the specification. A router, which has no other links to backbone | |
150 | area besides one virtual link, will not put any VL descriptor blocks into | |
151 | the Router-LSA generated for area 0 until a full adjacency over the VL is | |
152 | reached (RFC2328 12.4.1.3). In this case the Router-LSA initially received | |
153 | by the other end of the VL will have 0 link descriptor blocks, but soon will | |
154 | be replaced with the next revision having 1 descriptor block. */ | |
d62a17ae | 155 | struct router_lsa { |
156 | struct lsa_header header; | |
157 | u_char flags; | |
158 | u_char zero; | |
159 | u_int16_t links; | |
160 | struct { | |
161 | struct in_addr link_id; | |
162 | struct in_addr link_data; | |
163 | u_char type; | |
164 | u_char tos; | |
165 | u_int16_t metric; | |
166 | } link[1]; | |
718e3744 | 167 | }; |
168 | ||
169 | /* OSPF Network-LSAs structure. */ | |
4e31de79 | 170 | #define OSPF_NETWORK_LSA_MIN_SIZE 8U /* w/1 router-ID */ |
d62a17ae | 171 | struct network_lsa { |
172 | struct lsa_header header; | |
173 | struct in_addr mask; | |
174 | struct in_addr routers[1]; | |
718e3744 | 175 | }; |
176 | ||
177 | /* OSPF Summary-LSAs structure. */ | |
4e31de79 | 178 | #define OSPF_SUMMARY_LSA_MIN_SIZE 8U /* w/1 TOS metric block */ |
d62a17ae | 179 | struct summary_lsa { |
180 | struct lsa_header header; | |
181 | struct in_addr mask; | |
182 | u_char tos; | |
183 | u_char metric[3]; | |
718e3744 | 184 | }; |
185 | ||
186 | /* OSPF AS-external-LSAs structure. */ | |
4e31de79 | 187 | #define OSPF_AS_EXTERNAL_LSA_MIN_SIZE 16U /* w/1 TOS forwarding block */ |
d62a17ae | 188 | struct as_external_lsa { |
189 | struct lsa_header header; | |
190 | struct in_addr mask; | |
191 | struct { | |
192 | u_char tos; | |
193 | u_char metric[3]; | |
194 | struct in_addr fwd_addr; | |
195 | u_int32_t route_tag; | |
196 | } e[1]; | |
718e3744 | 197 | }; |
198 | ||
718e3744 | 199 | #include "ospfd/ospf_opaque.h" |
718e3744 | 200 | |
201 | /* Macros. */ | |
202 | #define GET_METRIC(x) get_metric(x) | |
203 | #define IS_EXTERNAL_METRIC(x) ((x) & 0x80) | |
204 | ||
205 | #define GET_AGE(x) (ntohs ((x)->data->ls_age) + time (NULL) - (x)->tv_recv) | |
d62a17ae | 206 | #define LS_AGE(x) (OSPF_LSA_MAXAGE < get_age(x) ? OSPF_LSA_MAXAGE : get_age(x)) |
718e3744 | 207 | #define IS_LSA_SELF(L) (CHECK_FLAG ((L)->flags, OSPF_LSA_SELF)) |
208 | #define IS_LSA_MAXAGE(L) (LS_AGE ((L)) == OSPF_LSA_MAXAGE) | |
209 | ||
718e3744 | 210 | #define OSPF_LSA_UPDATE_DELAY 2 |
211 | ||
d62a17ae | 212 | #define OSPF_LSA_UPDATE_TIMER_ON(T, F) \ |
213 | if (!(T)) \ | |
214 | (T) = thread_add_timer(master, (F), 0, 2) | |
718e3744 | 215 | |
718e3744 | 216 | /* Prototypes. */ |
4dadc291 | 217 | /* XXX: Eek, time functions, similar are in lib/thread.c */ |
d62a17ae | 218 | extern struct timeval int2tv(int); |
219 | extern struct timeval msec2tv(int); | |
4dadc291 | 220 | |
d62a17ae | 221 | extern int get_age(struct ospf_lsa *); |
222 | extern u_int16_t ospf_lsa_checksum(struct lsa_header *); | |
223 | extern int ospf_lsa_checksum_valid(struct lsa_header *); | |
224 | extern int ospf_lsa_refresh_delay(struct ospf_lsa *); | |
4dadc291 | 225 | |
d62a17ae | 226 | extern const char *dump_lsa_key(struct ospf_lsa *); |
227 | extern u_int32_t lsa_seqnum_increment(struct ospf_lsa *); | |
228 | extern void lsa_header_set(struct stream *, u_char, u_char, struct in_addr, | |
229 | struct in_addr); | |
230 | extern struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *); | |
231 | extern int ospf_check_nbr_status(struct ospf *); | |
718e3744 | 232 | |
233 | /* Prototype for LSA primitive. */ | |
d62a17ae | 234 | extern struct ospf_lsa *ospf_lsa_new(void); |
235 | extern struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *); | |
236 | extern void ospf_lsa_free(struct ospf_lsa *); | |
237 | extern struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *); | |
238 | extern void ospf_lsa_unlock(struct ospf_lsa **); | |
239 | extern void ospf_lsa_discard(struct ospf_lsa *); | |
240 | extern int ospf_lsa_flush_schedule(struct ospf *, struct ospf_lsa *); | |
241 | extern struct lsa_header *ospf_lsa_data_new(size_t); | |
242 | extern struct lsa_header *ospf_lsa_data_dup(struct lsa_header *); | |
243 | extern void ospf_lsa_data_free(struct lsa_header *); | |
718e3744 | 244 | |
245 | /* Prototype for various LSAs */ | |
d62a17ae | 246 | extern int ospf_router_lsa_update(struct ospf *); |
247 | extern int ospf_router_lsa_update_area(struct ospf_area *); | |
248 | ||
249 | extern void ospf_network_lsa_update(struct ospf_interface *); | |
250 | ||
251 | extern struct ospf_lsa * | |
252 | ospf_summary_lsa_originate(struct prefix_ipv4 *, u_int32_t, struct ospf_area *); | |
253 | extern struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *, | |
254 | u_int32_t, | |
255 | struct ospf_area *); | |
256 | ||
257 | extern struct ospf_lsa *ospf_lsa_install(struct ospf *, struct ospf_interface *, | |
258 | struct ospf_lsa *); | |
259 | ||
260 | extern void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p); | |
261 | extern void ospf_external_lsa_flush(struct ospf *, u_char, struct prefix_ipv4 *, | |
262 | ifindex_t /* , struct in_addr nexthop */); | |
263 | ||
264 | extern struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *); | |
265 | ||
266 | extern struct ospf_lsa *ospf_external_lsa_originate(struct ospf *, | |
267 | struct external_info *); | |
268 | extern int ospf_external_lsa_originate_timer(struct thread *); | |
269 | extern int ospf_default_originate_timer(struct thread *); | |
270 | extern struct ospf_lsa *ospf_lsa_lookup(struct ospf_area *, u_int32_t, | |
271 | struct in_addr, struct in_addr); | |
272 | extern struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *, u_int32_t, | |
273 | struct in_addr); | |
274 | extern struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *, | |
275 | struct lsa_header *); | |
276 | extern int ospf_lsa_more_recent(struct ospf_lsa *, struct ospf_lsa *); | |
277 | extern int ospf_lsa_different(struct ospf_lsa *, struct ospf_lsa *); | |
278 | extern void ospf_flush_self_originated_lsas_now(struct ospf *); | |
279 | ||
280 | extern int ospf_lsa_is_self_originated(struct ospf *, struct ospf_lsa *); | |
281 | ||
282 | extern struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *, u_char, | |
283 | struct prefix_ipv4 *, | |
284 | struct in_addr); | |
285 | ||
286 | extern void ospf_lsa_maxage(struct ospf *, struct ospf_lsa *); | |
287 | extern u_int32_t get_metric(u_char *); | |
288 | ||
289 | extern int ospf_lsa_maxage_walker(struct thread *); | |
290 | extern struct ospf_lsa *ospf_lsa_refresh(struct ospf *, struct ospf_lsa *); | |
291 | ||
292 | extern void ospf_external_lsa_refresh_default(struct ospf *); | |
293 | ||
294 | extern void ospf_external_lsa_refresh_type(struct ospf *, u_char, u_short, int); | |
295 | extern struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *, | |
296 | struct ospf_lsa *, | |
297 | struct external_info *, int); | |
298 | extern struct in_addr ospf_lsa_unique_id(struct ospf *, struct ospf_lsdb *, | |
299 | u_char, struct prefix_ipv4 *); | |
300 | extern void ospf_schedule_lsa_flood_area(struct ospf_area *, struct ospf_lsa *); | |
301 | extern void ospf_schedule_lsa_flush_area(struct ospf_area *, struct ospf_lsa *); | |
302 | ||
303 | extern void ospf_refresher_register_lsa(struct ospf *, struct ospf_lsa *); | |
304 | extern void ospf_refresher_unregister_lsa(struct ospf *, struct ospf_lsa *); | |
305 | extern int ospf_lsa_refresh_walker(struct thread *); | |
306 | ||
307 | extern void ospf_lsa_maxage_delete(struct ospf *, struct ospf_lsa *); | |
308 | ||
309 | extern void ospf_discard_from_db(struct ospf *, struct ospf_lsdb *, | |
310 | struct ospf_lsa *); | |
311 | extern int is_prefix_default(struct prefix_ipv4 *); | |
312 | ||
313 | extern int metric_type(struct ospf *, u_char, u_short); | |
314 | extern int metric_value(struct ospf *, u_char, u_short); | |
315 | ||
316 | extern struct in_addr ospf_get_nssa_ip(struct ospf_area *); | |
317 | extern int ospf_translated_nssa_compare(struct ospf_lsa *, struct ospf_lsa *); | |
318 | extern struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *, | |
319 | struct ospf_lsa *, | |
320 | struct ospf_lsa *); | |
321 | extern struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *, | |
322 | struct ospf_lsa *); | |
f2c80652 | 323 | |
718e3744 | 324 | #endif /* _ZEBRA_OSPF_LSA_H */ |