File: ospf_lsa.h

package info (click to toggle)
quagga 0.98.3-7.5
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 11,424 kB
  • ctags: 11,439
  • sloc: ansic: 164,201; sh: 9,243; perl: 638; makefile: 413; lisp: 62
file content (325 lines) | stat: -rw-r--r-- 10,237 bytes parent folder | download
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
/*
 * OSPF Link State Advertisement
 * Copyright (C) 1999, 2000 Toshiaki Takada
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef _ZEBRA_OSPF_LSA_H
#define _ZEBRA_OSPF_LSA_H

/* OSPF LSA Range definition. */
#define OSPF_MIN_LSA		1  /* begin range here */
#if defined (HAVE_OPAQUE_LSA)
#define OSPF_MAX_LSA           12
#else
#define OSPF_MAX_LSA		8
#endif

/* 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_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
{
  u_int16_t ls_age;
  u_char options;
  u_char type;
  struct in_addr id;
  struct in_addr adv_router;
  u_int32_t ls_seqnum;
  u_int16_t checksum;
  u_int16_t length;
};

/* OSPF LSA. */
struct ospf_lsa
{
  /* LSA origination flag. */
  u_char 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

  /* LSA data. */
  struct lsa_header *data;

  /* 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;

  /* 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;

#ifdef HAVE_OPAQUE_LSA
  /* For Type-9 Opaque-LSAs, reference to ospf-interface is required. */
  struct ospf_interface *oi;
#endif /* HAVE_OPAQUE_LSA */
};

/* 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
  {
    u_char type;
    u_char tos_count;
    u_int16_t metric;
  } m[1];
};

/* OSPF Router-LSAs structure. */
struct router_lsa
{
  struct lsa_header header;
  u_char flags;
  u_char zero;
  u_int16_t links;
  struct
  {
    struct in_addr link_id;
    struct in_addr link_data;
    u_char type;
    u_char tos;
    u_int16_t metric;
  } link[1];
};

/* OSPF Network-LSAs structure. */
struct network_lsa
{
  struct lsa_header header;
  struct in_addr mask;
  struct in_addr routers[1];
};

/* OSPF Summary-LSAs structure. */
struct summary_lsa
{
  struct lsa_header header;
  struct in_addr mask;
  u_char tos;
  u_char metric[3];
};

/* OSPF AS-external-LSAs structure. */
struct as_external_lsa
{
  struct lsa_header header;
  struct in_addr mask;
  struct
  {
    u_char tos;
    u_char metric[3];
    struct in_addr fwd_addr;
    u_int32_t route_tag;
  } e[1];
};

#ifdef HAVE_OPAQUE_LSA
#include "ospfd/ospf_opaque.h"
#endif /* HAVE_OPAQUE_LSA */

/* 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 OSPF_LSA_UPDATE_DELAY		2

#define OSPF_LSA_UPDATE_TIMER_ON(T,F) \
      if (!(T)) \
        (T) = thread_add_timer (master, (F), 0, 2)

struct ospf_route;
struct ospf_lsdb;

/* Prototypes. */
struct timeval tv_adjust (struct timeval);
int tv_ceil (struct timeval);
int tv_floor (struct timeval);
struct timeval int2tv (int);
struct timeval tv_add (struct timeval, struct timeval);
struct timeval tv_sub (struct timeval, struct timeval);
int tv_cmp (struct timeval, struct timeval);

int get_age (struct ospf_lsa *);
u_int16_t ospf_lsa_checksum (struct lsa_header *);

struct stream;
const char *dump_lsa_key (struct ospf_lsa *);
u_int32_t lsa_seqnum_increment (struct ospf_lsa *);
void lsa_header_set (struct stream *, u_char, u_char, struct in_addr,
		     struct in_addr);
struct ospf_neighbor *ospf_nbr_lookup_ptop (struct ospf_interface *);

/* Prototype for LSA primitive. */
struct ospf_lsa *ospf_lsa_new ();
struct ospf_lsa *ospf_lsa_dup ();
void ospf_lsa_free (struct ospf_lsa *);
struct ospf_lsa *ospf_lsa_lock (struct ospf_lsa *);
void ospf_lsa_unlock (struct ospf_lsa *);
void ospf_lsa_discard (struct ospf_lsa *);

struct lsa_header *ospf_lsa_data_new (size_t);
struct lsa_header *ospf_lsa_data_dup (struct lsa_header *);
void ospf_lsa_data_free (struct lsa_header *);

/* Prototype for various LSAs */
struct ospf_lsa *ospf_router_lsa_originate (struct ospf_area *);
int ospf_router_lsa_update_timer (struct thread *);
void ospf_router_lsa_timer_add (struct ospf_area *);

int ospf_network_lsa_refresh (struct ospf_lsa *, struct ospf_interface *);
void ospf_network_lsa_timer_add (struct ospf_interface *);

struct ospf_lsa *ospf_summary_lsa_originate (struct prefix_ipv4 *, u_int32_t,
					     struct ospf_area *);
struct ospf_lsa *ospf_summary_asbr_lsa_originate (struct prefix_ipv4 *,
						  u_int32_t,
						  struct ospf_area *);
struct ospf_lsa *ospf_summary_lsa_refresh (struct ospf *, struct ospf_lsa *);
struct ospf_lsa *ospf_summary_asbr_lsa_refresh (struct ospf *, struct ospf_lsa *);

struct ospf_lsa *ospf_lsa_install (struct ospf *,
				   struct ospf_interface *, struct ospf_lsa *);

void ospf_nssa_lsa_flush (struct ospf *ospf, struct prefix_ipv4 *p);
void ospf_external_lsa_flush (struct ospf *, u_char, struct prefix_ipv4 *,
			      unsigned int, struct in_addr);

struct in_addr ospf_get_ip_from_ifp (struct ospf_interface *);

struct ospf_lsa *ospf_external_lsa_originate (struct ospf *, struct external_info *);
int ospf_external_lsa_originate_timer (struct thread *);
struct ospf_lsa *ospf_lsa_lookup (struct ospf_area *, u_int32_t,
				  struct in_addr, struct in_addr);
struct ospf_lsa *ospf_lsa_lookup_by_id (struct ospf_area *,
                                        u_int32_t, 
                                        struct in_addr);
struct ospf_lsa *ospf_lsa_lookup_by_header (struct ospf_area *,
					    struct lsa_header *);
int ospf_lsa_more_recent (struct ospf_lsa *, struct ospf_lsa *);
int ospf_lsa_different (struct ospf_lsa *, struct ospf_lsa *);
void ospf_flush_self_originated_lsas_now (struct ospf *);

int ospf_lsa_is_self_originated (struct ospf *, struct ospf_lsa *);

struct ospf_lsa *ospf_lsa_lookup_by_prefix (struct ospf_lsdb *, u_char,
					    struct prefix_ipv4 *,
					    struct in_addr);

void ospf_lsa_maxage (struct ospf *, struct ospf_lsa *);
u_int32_t get_metric (u_char *);

int ospf_lsa_maxage_walker (struct thread *);

void ospf_external_lsa_refresh_default (struct ospf *);

void ospf_external_lsa_refresh_type (struct ospf *, u_char, int);
void ospf_external_lsa_refresh (struct ospf *, struct ospf_lsa *,
				struct external_info *, int);
struct in_addr ospf_lsa_unique_id (struct ospf *, struct ospf_lsdb *, u_char,
				   struct prefix_ipv4 *);
void ospf_schedule_lsa_flood_area (struct ospf_area *, struct ospf_lsa *);
void ospf_schedule_lsa_flush_area (struct ospf_area *, struct ospf_lsa *);

void ospf_refresher_register_lsa (struct ospf *, struct ospf_lsa *);
void ospf_refresher_unregister_lsa (struct ospf *, struct ospf_lsa *);
int ospf_lsa_refresh_walker (struct thread *);

void ospf_lsa_maxage_delete (struct ospf *, struct ospf_lsa *);

void ospf_discard_from_db (struct ospf *, struct ospf_lsdb *, struct ospf_lsa*);
int is_prefix_default (struct prefix_ipv4 *);

int metric_type (struct ospf *, u_char);
int metric_value (struct ospf *, u_char);

struct in_addr ospf_get_nssa_ip (struct ospf_area *);
int ospf_translated_nssa_compare (struct ospf_lsa *, struct ospf_lsa *);
struct ospf_lsa *ospf_translated_nssa_refresh (struct ospf *, struct ospf_lsa *,
                                   struct ospf_lsa *);
struct ospf_lsa *ospf_translated_nssa_originate (struct ospf *, struct ospf_lsa *);

#endif /* _ZEBRA_OSPF_LSA_H */