1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSPF Link State Advertisement
* Copyright (C) 1999, 2000 Toshiaki Takada
*/
#ifndef _ZEBRA_OSPF_LSA_H
#define _ZEBRA_OSPF_LSA_H
#include "stream.h"
/* OSPF LSA Default metric values */
#define DEFAULT_DEFAULT_METRIC 20
#define DEFAULT_DEFAULT_ORIGINATE_METRIC 10
#define DEFAULT_DEFAULT_ALWAYS_METRIC 1
#define DEFAULT_METRIC_TYPE EXTERNAL_METRIC_TYPE_2
/* OSPF LSA Range definition. */
#define OSPF_MIN_LSA 1 /* begin range here */
#define OSPF_MAX_LSA 12
/* OSPF LSA Type definition. */
#define OSPF_UNKNOWN_LSA 0
#define OSPF_ROUTER_LSA 1
#define OSPF_NETWORK_LSA 2
#define OSPF_SUMMARY_LSA 3
#define OSPF_ASBR_SUMMARY_LSA 4
#define OSPF_AS_EXTERNAL_LSA 5
#define OSPF_GROUP_MEMBER_LSA 6 /* Not supported. */
#define OSPF_AS_NSSA_LSA 7
#define OSPF_EXTERNAL_ATTRIBUTES_LSA 8 /* Not supported. */
#define OSPF_OPAQUE_LINK_LSA 9
#define OSPF_OPAQUE_AREA_LSA 10
#define OSPF_OPAQUE_AS_LSA 11
#define OSPF_LSA_HEADER_SIZE 20U
#define OSPF_ROUTER_LSA_LINK_SIZE 12U
#define OSPF_ROUTER_LSA_TOS_SIZE 4U
#define OSPF_MAX_LSA_SIZE 1500U
/* AS-external-LSA refresh method. */
#define LSA_REFRESH_IF_CHANGED 0
#define LSA_REFRESH_FORCE 1
/* OSPF LSA header. */
struct lsa_header {
uint16_t ls_age;
#define DO_NOT_AGE 0x8000
uint8_t options;
uint8_t type;
struct in_addr id;
struct in_addr adv_router;
uint32_t ls_seqnum;
uint16_t checksum;
uint16_t length;
};
struct vertex;
/* OSPF LSA. */
struct ospf_lsa {
/* LSA origination flag. */
uint8_t flags;
#define OSPF_LSA_SELF 0x01
#define OSPF_LSA_SELF_CHECKED 0x02
#define OSPF_LSA_RECEIVED 0x04
#define OSPF_LSA_APPROVED 0x08
#define OSPF_LSA_DISCARD 0x10
#define OSPF_LSA_LOCAL_XLT 0x20
#define OSPF_LSA_PREMATURE_AGE 0x40
#define OSPF_LSA_IN_MAXAGE 0x80
/* LSA data. and size */
struct lsa_header *data;
size_t size;
/* Received time stamp. */
struct timeval tv_recv;
/* Last time it was originated */
struct timeval tv_orig;
/* All of reference count, also lock to remove. */
int lock;
/* Flags for the SPF calculation. */
struct vertex *stat;
/* References to this LSA in neighbor retransmission lists*/
int retransmit_counter;
/* Area the LSA belongs to, may be NULL if AS-external-LSA. */
struct ospf_area *area;
/* Parent LSDB. */
struct ospf_lsdb *lsdb;
/* Related Route. */
void *route;
/* Refreshement List or Queue */
int refresh_list;
/* For Type-9 Opaque-LSAs */
struct ospf_interface *oi;
/* VRF Id */
vrf_id_t vrf_id;
/*For topo chg detection in HELPER role*/
bool to_be_acknowledged;
/* send maxage with no data */
bool opaque_zero_len_delete;
};
/* OSPF LSA Link Type. */
#define LSA_LINK_TYPE_POINTOPOINT 1
#define LSA_LINK_TYPE_TRANSIT 2
#define LSA_LINK_TYPE_STUB 3
#define LSA_LINK_TYPE_VIRTUALLINK 4
/* OSPF Router LSA Flag. */
#define ROUTER_LSA_BORDER 0x01 /* The router is an ABR */
#define ROUTER_LSA_EXTERNAL 0x02 /* The router is an ASBR */
#define ROUTER_LSA_VIRTUAL 0x04 /* The router has a VL in this area */
#define ROUTER_LSA_NT 0x10 /* The routers always translates Type-7 */
#define ROUTER_LSA_SHORTCUT 0x20 /* Shortcut-ABR specific flag */
#define IS_ROUTER_LSA_VIRTUAL(x) ((x)->flags & ROUTER_LSA_VIRTUAL)
#define IS_ROUTER_LSA_EXTERNAL(x) ((x)->flags & ROUTER_LSA_EXTERNAL)
#define IS_ROUTER_LSA_BORDER(x) ((x)->flags & ROUTER_LSA_BORDER)
#define IS_ROUTER_LSA_SHORTCUT(x) ((x)->flags & ROUTER_LSA_SHORTCUT)
#define IS_ROUTER_LSA_NT(x) ((x)->flags & ROUTER_LSA_NT)
/* OSPF Router-LSA Link information. */
struct router_lsa_link {
struct in_addr link_id;
struct in_addr link_data;
struct {
uint8_t type;
uint8_t tos_count;
uint16_t metric;
} m[1];
};
/* OSPF Router-LSAs structure. */
#define OSPF_ROUTER_LSA_MIN_SIZE 4U /* w/0 link descriptors */
/* There is an edge case, when number of links in a Router-LSA may be 0 without
breaking the specification. A router, which has no other links to backbone
area besides one virtual link, will not put any VL descriptor blocks into
the Router-LSA generated for area 0 until a full adjacency over the VL is
reached (RFC2328 12.4.1.3). In this case the Router-LSA initially received
by the other end of the VL will have 0 link descriptor blocks, but soon will
be replaced with the next revision having 1 descriptor block. */
struct router_lsa {
struct lsa_header header;
uint8_t flags;
uint8_t zero;
uint16_t links;
struct router_link {
struct in_addr link_id;
struct in_addr link_data;
uint8_t type;
uint8_t tos;
uint16_t metric;
} link[1];
};
/* OSPF Network-LSAs structure. */
#define OSPF_NETWORK_LSA_MIN_SIZE 8U /* w/1 router-ID */
struct network_lsa {
struct lsa_header header;
struct in_addr mask;
struct in_addr routers[1];
};
/* OSPF Summary-LSAs structure. */
#define OSPF_SUMMARY_LSA_MIN_SIZE 8U /* w/1 TOS metric block */
struct summary_lsa {
struct lsa_header header;
struct in_addr mask;
uint8_t tos;
uint8_t metric[3];
};
/* OSPF AS-external-LSAs structure. */
#define OSPF_AS_EXTERNAL_LSA_MIN_SIZE 16U /* w/1 TOS forwarding block */
struct as_external_lsa {
struct lsa_header header;
struct in_addr mask;
struct as_route {
uint8_t tos;
uint8_t metric[3];
struct in_addr fwd_addr;
uint32_t route_tag;
} e[1];
};
enum lsid_status { LSID_AVAILABLE = 0, LSID_CHANGE, LSID_NOT_AVAILABLE };
#include "ospfd/ospf_opaque.h"
/* Macros. */
#define GET_METRIC(x) get_metric(x)
#define IS_EXTERNAL_METRIC(x) ((x) & 0x80)
#define GET_AGE(x) (ntohs ((x)->data->ls_age) + time (NULL) - (x)->tv_recv)
#define LS_AGE(x) (OSPF_LSA_MAXAGE < get_age(x) ? OSPF_LSA_MAXAGE : get_age(x))
#define IS_LSA_SELF(L) (CHECK_FLAG ((L)->flags, OSPF_LSA_SELF))
#define IS_LSA_MAXAGE(L) (LS_AGE ((L)) == OSPF_LSA_MAXAGE)
#define IS_LSA_MAX_SEQ(L) \
((L)->data->ls_seqnum == htonl(OSPF_MAX_SEQUENCE_NUMBER))
#define OSPF_LSA_UPDATE_DELAY 2
#define CHECK_LSA_TYPE_1_TO_5_OR_7(type) \
((type == OSPF_ROUTER_LSA) || (type == OSPF_NETWORK_LSA) \
|| (type == OSPF_SUMMARY_LSA) || (type == OSPF_ASBR_SUMMARY_LSA) \
|| (type == OSPF_AS_EXTERNAL_LSA) || (type == OSPF_AS_NSSA_LSA))
#define OSPF_FR_CONFIG(o, a) \
(o->fr_configured || ((a != NULL) ? a->fr_info.configured : 0))
/* Prototypes. */
/* XXX: Eek, time functions, similar are in lib/thread.c */
extern struct timeval int2tv(int);
extern struct timeval msec2tv(int);
extern int get_age(struct ospf_lsa *);
extern uint16_t ospf_lsa_checksum(struct lsa_header *);
extern int ospf_lsa_checksum_valid(struct lsa_header *);
extern int ospf_lsa_refresh_delay(struct ospf_lsa *);
extern const char *dump_lsa_key(struct ospf_lsa *);
extern uint32_t lsa_seqnum_increment(struct ospf_lsa *);
extern void lsa_header_set(struct stream *, uint8_t, uint8_t, struct in_addr,
struct in_addr);
extern struct ospf_neighbor *ospf_nbr_lookup_ptop(struct ospf_interface *);
extern int ospf_check_nbr_status(struct ospf *);
/* Prototype for LSA primitive. */
extern struct ospf_lsa *ospf_lsa_new(void);
extern struct ospf_lsa *ospf_lsa_new_and_data(size_t size);
extern struct ospf_lsa *ospf_lsa_dup(struct ospf_lsa *);
extern void ospf_lsa_free(struct ospf_lsa *);
extern struct ospf_lsa *ospf_lsa_lock(struct ospf_lsa *);
extern void ospf_lsa_unlock(struct ospf_lsa **);
extern void ospf_lsa_discard(struct ospf_lsa *);
extern int ospf_lsa_flush_schedule(struct ospf *, struct ospf_lsa *);
extern struct lsa_header *ospf_lsa_data_new(size_t);
extern struct lsa_header *ospf_lsa_data_dup(struct lsa_header *);
extern void ospf_lsa_data_free(struct lsa_header *);
/* Prototype for various LSAs */
extern void ospf_router_lsa_body_set(struct stream **s, struct ospf_area *area);
extern uint8_t router_lsa_flags(struct ospf_area *area);
extern int ospf_router_lsa_update(struct ospf *);
extern int ospf_router_lsa_update_area(struct ospf_area *);
extern void ospf_network_lsa_update(struct ospf_interface *);
extern struct ospf_lsa *
ospf_summary_lsa_originate(struct prefix_ipv4 *, uint32_t, struct ospf_area *);
extern struct ospf_lsa *ospf_summary_asbr_lsa_originate(struct prefix_ipv4 *,
uint32_t,
struct ospf_area *);
extern struct ospf_lsa *ospf_lsa_install(struct ospf *, struct ospf_interface *,
struct ospf_lsa *);
extern void ospf_nssa_lsa_flush(struct ospf *ospf, struct prefix_ipv4 *p);
extern void ospf_external_lsa_flush(struct ospf *, uint8_t,
struct prefix_ipv4 *,
ifindex_t /* , struct in_addr nexthop */);
extern struct in_addr ospf_get_ip_from_ifp(struct ospf_interface *);
extern struct ospf_lsa *ospf_external_lsa_originate(struct ospf *,
struct external_info *);
extern void ospf_external_lsa_rid_change(struct ospf *ospf);
extern struct ospf_lsa *ospf_lsa_lookup(struct ospf *ospf, struct ospf_area *,
uint32_t, struct in_addr,
struct in_addr);
extern struct ospf_lsa *ospf_lsa_lookup_by_id(struct ospf_area *, uint32_t,
struct in_addr);
extern struct ospf_lsa *ospf_lsa_lookup_by_header(struct ospf_area *,
struct lsa_header *);
extern int ospf_lsa_more_recent(struct ospf_lsa *, struct ospf_lsa *);
extern int ospf_lsa_different(struct ospf_lsa *, struct ospf_lsa *,
bool ignore_rcvd_flag);
extern void ospf_flush_self_originated_lsas_now(struct ospf *);
extern int ospf_lsa_is_self_originated(struct ospf *, struct ospf_lsa *);
extern struct ospf_lsa *ospf_lsa_lookup_by_prefix(struct ospf_lsdb *, uint8_t,
struct prefix_ipv4 *,
struct in_addr);
extern void ospf_lsa_maxage(struct ospf *, struct ospf_lsa *);
extern uint32_t get_metric(uint8_t *);
extern void ospf_lsa_maxage_walker(struct thread *thread);
extern struct ospf_lsa *ospf_lsa_refresh(struct ospf *, struct ospf_lsa *);
extern void ospf_external_lsa_refresh_default(struct ospf *);
extern void ospf_external_lsa_refresh_type(struct ospf *, uint8_t,
unsigned short, int);
extern struct ospf_lsa *ospf_external_lsa_refresh(struct ospf *,
struct ospf_lsa *,
struct external_info *, int,
bool aggr);
extern enum lsid_status ospf_lsa_unique_id(struct ospf *ospf,
struct ospf_lsdb *lsdb,
uint8_t type, struct prefix_ipv4 *p,
struct in_addr *addr);
extern void ospf_schedule_lsa_flood_area(struct ospf_area *, struct ospf_lsa *);
extern void ospf_schedule_lsa_flush_area(struct ospf_area *, struct ospf_lsa *);
extern void ospf_refresher_register_lsa(struct ospf *, struct ospf_lsa *);
extern void ospf_refresher_unregister_lsa(struct ospf *, struct ospf_lsa *);
extern void ospf_lsa_refresh_walker(struct thread *thread);
extern void ospf_lsa_maxage_delete(struct ospf *, struct ospf_lsa *);
extern void ospf_discard_from_db(struct ospf *, struct ospf_lsdb *,
struct ospf_lsa *);
extern int metric_type(struct ospf *, uint8_t, unsigned short);
extern int metric_value(struct ospf *, uint8_t, unsigned short);
extern char link_info_set(struct stream **s, struct in_addr id,
struct in_addr data, uint8_t type, uint8_t tos,
uint16_t cost);
extern struct in_addr ospf_get_nssa_ip(struct ospf_area *);
extern int ospf_translated_nssa_compare(struct ospf_lsa *, struct ospf_lsa *);
extern struct ospf_lsa *ospf_translated_nssa_refresh(struct ospf *ospf,
struct ospf_lsa *type7,
struct ospf_lsa *type5);
extern struct ospf_lsa *ospf_translated_nssa_originate(struct ospf *ospf,
struct ospf_lsa *type7,
struct ospf_lsa *type5);
extern void ospf_check_and_gen_init_seq_lsa(struct ospf_interface *oi,
struct ospf_lsa *lsa);
extern void ospf_flush_lsa_from_area(struct ospf *ospf, struct in_addr area_id,
int type);
extern void ospf_maxage_lsa_remover(struct thread *thread);
extern bool ospf_check_dna_lsa(const struct ospf_lsa *lsa);
extern void ospf_refresh_area_self_lsas(struct ospf_area *area);
/** @brief Check if the LSA is an indication LSA.
* @param lsa pointer.
* @return true or false based on lsa info.
*/
static inline bool ospf_check_indication_lsa(struct ospf_lsa *lsa)
{
struct summary_lsa *sl = NULL;
if (lsa->data->type == OSPF_ASBR_SUMMARY_LSA) {
sl = (struct summary_lsa *)lsa->data;
if ((GET_METRIC(sl->metric) == OSPF_LS_INFINITY) &&
!CHECK_FLAG(lsa->data->options, OSPF_OPTION_DC))
return true;
}
return false;
}
#endif /* _ZEBRA_OSPF_LSA_H */
|
