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
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
|
/* $OpenBSD: neighbor.c,v 1.45 2015/03/21 18:34:01 renato Exp $ */
/*
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <event.h>
#include <unistd.h>
#include "ldpd.h"
#include "ldp.h"
#include "ldpe.h"
#include "control.h"
#include "log.h"
#include "lde.h"
void nbr_send_labelmappings(struct nbr *);
int nbr_act_session_operational(struct nbr *);
static __inline int nbr_id_compare(struct nbr *, struct nbr *);
static __inline int nbr_pid_compare(struct nbr *, struct nbr *);
RB_HEAD(nbr_id_head, nbr);
RB_PROTOTYPE(nbr_id_head, nbr, id_tree, nbr_id_compare)
RB_GENERATE(nbr_id_head, nbr, id_tree, nbr_id_compare)
RB_HEAD(nbr_pid_head, nbr);
RB_PROTOTYPE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
RB_GENERATE(nbr_pid_head, nbr, pid_tree, nbr_pid_compare)
static __inline int
nbr_id_compare(struct nbr *a, struct nbr *b)
{
return (ntohl(a->id.s_addr) - ntohl(b->id.s_addr));
}
static __inline int
nbr_pid_compare(struct nbr *a, struct nbr *b)
{
return (a->peerid - b->peerid);
}
struct nbr_id_head nbrs_by_id = RB_INITIALIZER(&nbrs_by_id);
struct nbr_pid_head nbrs_by_pid = RB_INITIALIZER(&nbrs_by_pid);
u_int32_t peercnt = NBR_CNTSTART;
extern struct ldpd_conf *leconf;
struct {
int state;
enum nbr_event event;
enum nbr_action action;
int new_state;
} nbr_fsm_tbl[] = {
/* current state event that happened action to take resulting state */
/* Passive Role */
{NBR_STA_PRESENT, NBR_EVT_MATCH_ADJ, NBR_ACT_NOTHING, NBR_STA_INITIAL},
{NBR_STA_INITIAL, NBR_EVT_INIT_RCVD, NBR_ACT_PASSIVE_INIT, NBR_STA_OPENREC},
{NBR_STA_OPENREC, NBR_EVT_KEEPALIVE_RCVD, NBR_ACT_SESSION_EST, NBR_STA_OPER},
/* Active Role */
{NBR_STA_PRESENT, NBR_EVT_CONNECT_UP, NBR_ACT_CONNECT_SETUP, NBR_STA_INITIAL},
{NBR_STA_INITIAL, NBR_EVT_INIT_SENT, NBR_ACT_NOTHING, NBR_STA_OPENSENT},
{NBR_STA_OPENSENT, NBR_EVT_INIT_RCVD, NBR_ACT_KEEPALIVE_SEND, NBR_STA_OPENREC},
/* Session Maintenance */
{NBR_STA_OPER, NBR_EVT_PDU_RCVD, NBR_ACT_RST_KTIMEOUT, 0},
{NBR_STA_OPER, NBR_EVT_PDU_SENT, NBR_ACT_RST_KTIMER, 0},
/* Session Close */
{NBR_STA_PRESENT, NBR_EVT_CLOSE_SESSION, NBR_ACT_NOTHING, 0},
{NBR_STA_SESSION, NBR_EVT_CLOSE_SESSION, NBR_ACT_CLOSE_SESSION, NBR_STA_PRESENT},
{-1, NBR_EVT_NOTHING, NBR_ACT_NOTHING, 0},
};
const char * const nbr_event_names[] = {
"NOTHING",
"ADJACENCY MATCHED",
"CONNECTION UP",
"SESSION CLOSE",
"INIT RECEIVED",
"KEEPALIVE RECEIVED",
"PDU RECEIVED",
"PDU SENT",
"INIT SENT"
};
const char * const nbr_action_names[] = {
"NOTHING",
"RESET KEEPALIVE TIMEOUT",
"START NEIGHBOR SESSION",
"RESET KEEPALIVE TIMER",
"SETUP NEIGHBOR CONNECTION",
"SEND INIT AND KEEPALIVE",
"SEND KEEPALIVE",
"CLOSE SESSION"
};
int
nbr_fsm(struct nbr *nbr, enum nbr_event event)
{
struct timeval now;
int old_state;
int new_state = 0;
int i;
old_state = nbr->state;
for (i = 0; nbr_fsm_tbl[i].state != -1; i++)
if ((nbr_fsm_tbl[i].state & old_state) &&
(nbr_fsm_tbl[i].event == event)) {
new_state = nbr_fsm_tbl[i].new_state;
break;
}
if (nbr_fsm_tbl[i].state == -1) {
/* event outside of the defined fsm, ignore it. */
log_warnx("nbr_fsm: neighbor ID %s, "
"event %s not expected in state %s",
inet_ntoa(nbr->id), nbr_event_names[event],
nbr_state_name(old_state));
return (0);
}
if (new_state != 0)
nbr->state = new_state;
if (old_state != nbr->state) {
log_debug("nbr_fsm: event %s resulted in action %s and "
"changing state for neighbor ID %s from %s to %s",
nbr_event_names[event],
nbr_action_names[nbr_fsm_tbl[i].action],
inet_ntoa(nbr->id), nbr_state_name(old_state),
nbr_state_name(nbr->state));
if (nbr->state == NBR_STA_OPER) {
gettimeofday(&now, NULL);
nbr->uptime = now.tv_sec;
}
}
switch (nbr_fsm_tbl[i].action) {
case NBR_ACT_RST_KTIMEOUT:
nbr_start_ktimeout(nbr);
break;
case NBR_ACT_RST_KTIMER:
nbr_start_ktimer(nbr);
break;
case NBR_ACT_SESSION_EST:
nbr_act_session_operational(nbr);
nbr_start_ktimer(nbr);
nbr_start_ktimeout(nbr);
send_address(nbr, NULL);
nbr_send_labelmappings(nbr);
break;
case NBR_ACT_CONNECT_SETUP:
nbr->tcp = tcp_new(nbr->fd, nbr);
/* trigger next state */
send_init(nbr);
nbr_fsm(nbr, NBR_EVT_INIT_SENT);
break;
case NBR_ACT_PASSIVE_INIT:
send_init(nbr);
send_keepalive(nbr);
break;
case NBR_ACT_KEEPALIVE_SEND:
nbr_start_ktimeout(nbr);
send_keepalive(nbr);
break;
case NBR_ACT_CLOSE_SESSION:
ldpe_imsg_compose_lde(IMSG_NEIGHBOR_DOWN, nbr->peerid, 0,
NULL, 0);
session_close(nbr);
break;
case NBR_ACT_NOTHING:
/* do nothing */
break;
}
return (0);
}
struct nbr *
nbr_new(struct in_addr id, struct in_addr addr)
{
struct nbr *nbr;
log_debug("nbr_new: LSR ID %s", inet_ntoa(id));
if ((nbr = calloc(1, sizeof(*nbr))) == NULL)
fatal("nbr_new");
nbr->state = NBR_STA_PRESENT;
nbr->id.s_addr = id.s_addr;
nbr->addr.s_addr = addr.s_addr;
/* get next unused peerid */
while (nbr_find_peerid(++peercnt))
;
nbr->peerid = peercnt;
if (RB_INSERT(nbr_pid_head, &nbrs_by_pid, nbr) != NULL)
fatalx("nbr_new: RB_INSERT(nbrs_by_pid) failed");
if (RB_INSERT(nbr_id_head, &nbrs_by_id, nbr) != NULL)
fatalx("nbr_new: RB_INSERT(nbrs_by_id) failed");
TAILQ_INIT(&nbr->mapping_list);
TAILQ_INIT(&nbr->withdraw_list);
TAILQ_INIT(&nbr->request_list);
TAILQ_INIT(&nbr->release_list);
TAILQ_INIT(&nbr->abortreq_list);
/* set event structures */
evtimer_set(&nbr->keepalive_timeout, nbr_ktimeout, nbr);
evtimer_set(&nbr->keepalive_timer, nbr_ktimer, nbr);
evtimer_set(&nbr->initdelay_timer, nbr_idtimer, nbr);
return (nbr);
}
void
nbr_del(struct nbr *nbr)
{
log_debug("nbr_del: LSR ID %s", inet_ntoa(nbr->id));
nbr_fsm(nbr, NBR_EVT_CLOSE_SESSION);
if (event_pending(&nbr->ev_connect, EV_WRITE, NULL))
event_del(&nbr->ev_connect);
nbr_stop_ktimer(nbr);
nbr_stop_ktimeout(nbr);
nbr_stop_idtimer(nbr);
mapping_list_clr(&nbr->mapping_list);
mapping_list_clr(&nbr->withdraw_list);
mapping_list_clr(&nbr->request_list);
mapping_list_clr(&nbr->release_list);
mapping_list_clr(&nbr->abortreq_list);
RB_REMOVE(nbr_pid_head, &nbrs_by_pid, nbr);
RB_REMOVE(nbr_id_head, &nbrs_by_id, nbr);
free(nbr);
}
struct nbr *
nbr_find_peerid(u_int32_t peerid)
{
struct nbr n;
n.peerid = peerid;
return (RB_FIND(nbr_pid_head, &nbrs_by_pid, &n));
}
struct nbr *
nbr_find_ldpid(u_int32_t rtr_id)
{
struct nbr n;
n.id.s_addr = rtr_id;
return (RB_FIND(nbr_id_head, &nbrs_by_id, &n));
}
int
nbr_session_active_role(struct nbr *nbr)
{
if (ntohl(ldpe_router_id()) > ntohl(nbr->addr.s_addr))
return (1);
return (0);
}
/* timers */
/* Keepalive timer: timer to send keepalive message to neighbors */
void
nbr_ktimer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
struct timeval tv;
send_keepalive(nbr);
timerclear(&tv);
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD);
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1)
fatal("nbr_ktimer");
}
void
nbr_start_ktimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
/* XXX: just to be sure it will send three keepalives per period */
tv.tv_sec = (time_t)(nbr->keepalive / KEEPALIVE_PER_PERIOD);
if (evtimer_add(&nbr->keepalive_timer, &tv) == -1)
fatal("nbr_start_ktimer");
}
void
nbr_stop_ktimer(struct nbr *nbr)
{
if (evtimer_pending(&nbr->keepalive_timer, NULL) &&
evtimer_del(&nbr->keepalive_timer) == -1)
fatal("nbr_stop_ktimer");
}
/* Keepalive timeout: if the nbr hasn't sent keepalive */
void
nbr_ktimeout(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
log_debug("nbr_ktimeout: neighbor ID %s peerid %u", inet_ntoa(nbr->id),
nbr->peerid);
session_shutdown(nbr, S_KEEPALIVE_TMR, 0, 0);
}
void
nbr_start_ktimeout(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = nbr->keepalive;
if (evtimer_add(&nbr->keepalive_timeout, &tv) == -1)
fatal("nbr_start_ktimeout");
}
void
nbr_stop_ktimeout(struct nbr *nbr)
{
if (evtimer_pending(&nbr->keepalive_timeout, NULL) &&
evtimer_del(&nbr->keepalive_timeout) == -1)
fatal("nbr_stop_ktimeout");
}
/* Init delay timer: timer to retry to iniziatize session */
void
nbr_idtimer(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
log_debug("nbr_idtimer: neighbor ID %s peerid %u", inet_ntoa(nbr->id),
nbr->peerid);
if (nbr_session_active_role(nbr))
nbr_establish_connection(nbr);
else if (nbr->state == NBR_STA_INITIAL)
nbr_fsm(nbr, NBR_EVT_INIT_RCVD);
}
void
nbr_start_idtimer(struct nbr *nbr)
{
struct timeval tv;
timerclear(&tv);
tv.tv_sec = INIT_DELAY_TMR;
switch(nbr->idtimer_cnt) {
default:
/* do not further increase the counter */
tv.tv_sec = MAX_DELAY_TMR;
break;
case 2:
tv.tv_sec *= 2;
/* FALLTHROUGH */
case 1:
tv.tv_sec *= 2;
/* FALLTHROUGH */
case 0:
nbr->idtimer_cnt++;
break;
}
if (evtimer_add(&nbr->initdelay_timer, &tv) == -1)
fatal("nbr_start_idtimer");
}
void
nbr_stop_idtimer(struct nbr *nbr)
{
if (evtimer_pending(&nbr->initdelay_timer, NULL) &&
evtimer_del(&nbr->initdelay_timer) == -1)
fatal("nbr_stop_idtimer");
}
int
nbr_pending_idtimer(struct nbr *nbr)
{
if (evtimer_pending(&nbr->initdelay_timer, NULL))
return (1);
return (0);
}
int
nbr_pending_connect(struct nbr *nbr)
{
if (event_initialized(&nbr->ev_connect) &&
event_pending(&nbr->ev_connect, EV_WRITE, NULL))
return (1);
return (0);
}
static void
nbr_connect_cb(int fd, short event, void *arg)
{
struct nbr *nbr = arg;
int error;
socklen_t len;
len = sizeof(error);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
log_warn("nbr_connect_cb getsockopt SOL_SOCKET SO_ERROR");
return;
}
if (error) {
close(nbr->fd);
errno = error;
log_debug("nbr_connect_cb: error while "
"connecting to %s: %s", inet_ntoa(nbr->addr),
strerror(errno));
return;
}
nbr_fsm(nbr, NBR_EVT_CONNECT_UP);
}
int
nbr_establish_connection(struct nbr *nbr)
{
struct sockaddr_in local_sa;
struct sockaddr_in remote_sa;
struct adj *adj;
nbr->fd = socket(AF_INET, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
if (nbr->fd == -1) {
log_warn("nbr_establish_connection: error while "
"creating socket");
return (-1);
}
bzero(&local_sa, sizeof(local_sa));
local_sa.sin_family = AF_INET;
local_sa.sin_port = htons(0);
local_sa.sin_addr.s_addr = ldpe_router_id();
if (bind(nbr->fd, (struct sockaddr *) &local_sa,
sizeof(struct sockaddr_in)) == -1) {
log_warn("nbr_establish_connection: error while "
"binding socket to %s", inet_ntoa(local_sa.sin_addr));
close(nbr->fd);
return (-1);
}
bzero(&remote_sa, sizeof(remote_sa));
remote_sa.sin_family = AF_INET;
remote_sa.sin_port = htons(LDP_PORT);
remote_sa.sin_addr.s_addr = nbr->addr.s_addr;
/*
* Send an extra hello to guarantee that the remote peer has formed
* an adjacency as well.
*/
LIST_FOREACH(adj, &nbr->adj_list, nbr_entry)
send_hello(adj->source.type, adj->source.link.iface,
adj->source.target);
if (connect(nbr->fd, (struct sockaddr *)&remote_sa,
sizeof(remote_sa)) == -1) {
if (errno == EINPROGRESS) {
event_set(&nbr->ev_connect, nbr->fd, EV_WRITE,
nbr_connect_cb, nbr);
event_add(&nbr->ev_connect, NULL);
return (0);
}
log_warn("nbr_establish_connection: error while "
"connecting to %s", inet_ntoa(nbr->addr));
close(nbr->fd);
return (-1);
}
/* connection completed immediately */
nbr_fsm(nbr, NBR_EVT_CONNECT_UP);
return (0);
}
int
nbr_act_session_operational(struct nbr *nbr)
{
nbr->idtimer_cnt = 0;
return (ldpe_imsg_compose_lde(IMSG_NEIGHBOR_UP, nbr->peerid, 0,
&nbr->id, sizeof(nbr->id)));
}
void
nbr_send_labelmappings(struct nbr *nbr)
{
if (leconf->mode & MODE_ADV_UNSOLICITED) {
ldpe_imsg_compose_lde(IMSG_LABEL_MAPPING_FULL, nbr->peerid, 0,
NULL, 0);
}
}
void
nbr_mapping_add(struct nbr *nbr, struct mapping_head *mh, struct map *map)
{
struct mapping_entry *me;
me = calloc(1, sizeof(*me));
if (me == NULL)
fatal("nbr_mapping_add");
me->map = *map;
TAILQ_INSERT_TAIL(mh, me, entry);
}
void
mapping_list_clr(struct mapping_head *mh)
{
struct mapping_entry *me;
while ((me = TAILQ_FIRST(mh)) != NULL) {
TAILQ_REMOVE(mh, me, entry);
free(me);
}
}
struct ctl_nbr *
nbr_to_ctl(struct nbr *nbr)
{
static struct ctl_nbr nctl;
struct timeval now;
memcpy(&nctl.id, &nbr->id, sizeof(nctl.id));
memcpy(&nctl.addr, &nbr->addr, sizeof(nctl.addr));
nctl.nbr_state = nbr->state;
gettimeofday(&now, NULL);
if (nbr->state == NBR_STA_OPER) {
nctl.uptime = now.tv_sec - nbr->uptime;
} else
nctl.uptime = 0;
return (&nctl);
}
void
ldpe_nbr_ctl(struct ctl_conn *c)
{
struct nbr *nbr;
struct ctl_nbr *nctl;
RB_FOREACH(nbr, nbr_pid_head, &nbrs_by_pid) {
nctl = nbr_to_ctl(nbr);
imsg_compose_event(&c->iev, IMSG_CTL_SHOW_NBR, 0, 0, -1, nctl,
sizeof(struct ctl_nbr));
}
imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 0, -1, NULL, 0);
}
|