summaryrefslogtreecommitdiffstats
path: root/ldpd/labelmapping.c
blob: e8ce7fbdf534e34851905838951de5fda8344fd1 (plain)
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
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
/*	$OpenBSD$ */

/*
 * Copyright (c) 2014, 2015 Renato Westphal <renato@openbsd.org>
 * Copyright (c) 2009 Michele Marchetto <michele@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 <zebra.h>

#include "ldpd.h"
#include "ldpe.h"
#include "log.h"
#include "ldp_debug.h"

#include "mpls.h"

static void	 enqueue_pdu(struct nbr *, struct ibuf *, uint16_t);
static int	 gen_label_tlv(struct ibuf *, uint32_t);
static int	 gen_reqid_tlv(struct ibuf *, uint32_t);
static void	 log_msg_mapping(int, uint16_t, struct nbr *, struct map *);

static void
enqueue_pdu(struct nbr *nbr, struct ibuf *buf, uint16_t size)
{
	struct ldp_hdr		*ldp_hdr;

	ldp_hdr = ibuf_seek(buf, 0, sizeof(struct ldp_hdr));
	ldp_hdr->length = htons(size);
	evbuf_enqueue(&nbr->tcp->wbuf, buf);
}

/* Generic function that handles all Label Message types */
void
send_labelmessage(struct nbr *nbr, uint16_t type, struct mapping_head *mh)
{
	struct ibuf		*buf = NULL;
	struct mapping_entry	*me;
	uint16_t		 msg_size, size = 0;
	int			 first = 1;
	int			 err = 0;

	/* nothing to send */
	if (TAILQ_EMPTY(mh))
		return;

	while ((me = TAILQ_FIRST(mh)) != NULL) {
		/* generate pdu */
		if (first) {
			if ((buf = ibuf_open(nbr->max_pdu_len +
			    LDP_HDR_DEAD_LEN)) == NULL)
				fatal(__func__);

			/* real size will be set up later */
			err |= gen_ldp_hdr(buf, 0);

			size = LDP_HDR_PDU_LEN;
			first = 0;
		}

		/* calculate size */
		msg_size = LDP_MSG_SIZE;
		msg_size += len_fec_tlv(&me->map);
		if (me->map.label != NO_LABEL)
			msg_size += LABEL_TLV_SIZE;
		if (me->map.flags & F_MAP_REQ_ID)
			msg_size += REQID_TLV_SIZE;
		if (me->map.flags & F_MAP_STATUS)
			msg_size += STATUS_SIZE;

		/* maximum pdu length exceeded, we need a new ldp pdu */
		if (size + msg_size > nbr->max_pdu_len) {
			enqueue_pdu(nbr, buf, size);
			first = 1;
			continue;
		}

		size += msg_size;

		/* append message and tlvs */
		err |= gen_msg_hdr(buf, type, msg_size);
		err |= gen_fec_tlv(buf, &me->map);
		if (me->map.label != NO_LABEL)
			err |= gen_label_tlv(buf, me->map.label);
		if (me->map.flags & F_MAP_REQ_ID)
			err |= gen_reqid_tlv(buf, me->map.requestid);
	    	if (me->map.flags & F_MAP_PW_STATUS)
			err |= gen_pw_status_tlv(buf, me->map.pw_status);
		if (me->map.flags & F_MAP_STATUS)
			err |= gen_status_tlv(buf, me->map.st.status_code,
			    me->map.st.msg_id, me->map.st.msg_type);
		if (err) {
			ibuf_free(buf);
			mapping_list_clr(mh);
			return;
		}

		log_msg_mapping(1, type, nbr, &me->map);

		TAILQ_REMOVE(mh, me, entry);
		free(me);
	}

	enqueue_pdu(nbr, buf, size);

	nbr_fsm(nbr, NBR_EVT_PDU_SENT);
}

/* Generic function that handles all Label Message types */
int
recv_labelmessage(struct nbr *nbr, char *buf, uint16_t len, uint16_t type)
{
	struct ldp_msg		 msg;
	struct tlv		 ft;
	uint32_t		 label = NO_LABEL, reqid = 0;
	uint32_t		 pw_status = 0;
	uint8_t			 flags = 0;
	int			 feclen, tlen;
	uint16_t		 current_tlv = 1;
	struct mapping_entry	*me;
	struct mapping_head	 mh;
	struct map		 map;

	memcpy(&msg, buf, sizeof(msg));
	buf += LDP_MSG_SIZE;
	len -= LDP_MSG_SIZE;

	/* FEC TLV */
	if (len < sizeof(ft)) {
		session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
		return (-1);
	}

	memcpy(&ft, buf, sizeof(ft));
	if (ntohs(ft.type) != TLV_TYPE_FEC) {
		send_notification(nbr->tcp, S_MISS_MSG, msg.id, msg.type);
		return (-1);
	}
	feclen = ntohs(ft.length);
	if (feclen > len - TLV_HDR_SIZE) {
		session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
		return (-1);
	}

	buf += TLV_HDR_SIZE;	/* just advance to the end of the fec header */
	len -= TLV_HDR_SIZE;

	TAILQ_INIT(&mh);
	do {
		memset(&map, 0, sizeof(map));
		map.msg_id = msg.id;

		if ((tlen = tlv_decode_fec_elm(nbr, &msg, buf, feclen,
		    &map)) == -1)
			goto err;
		if (map.type == MAP_TYPE_PWID &&
		    !(map.flags & F_MAP_PW_ID) &&
		    type != MSG_TYPE_LABELWITHDRAW &&
		    type != MSG_TYPE_LABELRELEASE) {
			send_notification(nbr->tcp, S_MISS_MSG, msg.id,
			    msg.type);
			goto err;
		}

		/*
		 * The Wildcard FEC Element can be used only in the
		 * Label Withdraw and Label Release messages.
		 */
		if (map.type == MAP_TYPE_WILDCARD) {
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
			case MSG_TYPE_LABELREQUEST:
			case MSG_TYPE_LABELABORTREQ:
				session_shutdown(nbr, S_UNKNOWN_FEC, msg.id,
				    msg.type);
				goto err;
			default:
				break;
			}
		}

		/*
		 * RFC 5561 - Section 4:
		 * "An LDP implementation that supports the Typed Wildcard
		 * FEC Element MUST support its use in Label Request, Label
		 * Withdraw, and Label Release messages".
		 */
		if (map.type == MAP_TYPE_TYPED_WCARD) {
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
			case MSG_TYPE_LABELABORTREQ:
				session_shutdown(nbr, S_UNKNOWN_FEC, msg.id,
				    msg.type);
				goto err;
			default:
				break;
			}
		}

		/*
		 * LDP supports the use of multiple FEC Elements per
		 * FEC for the Label Mapping message only.
		 */
		if (type != MSG_TYPE_LABELMAPPING &&
		    tlen != feclen) {
			session_shutdown(nbr, S_BAD_TLV_VAL, msg.id, msg.type);
			goto err;
		}

		mapping_list_add(&mh, &map);

		buf += tlen;
		len -= tlen;
		feclen -= tlen;
	} while (feclen > 0);

	/* Optional Parameters */
	while (len > 0) {
		struct tlv 	tlv;
		uint16_t	tlv_type;
		uint16_t	tlv_len;
		uint32_t	reqbuf, labelbuf, statusbuf;

		if (len < sizeof(tlv)) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
			goto err;
		}

		memcpy(&tlv, buf, TLV_HDR_SIZE);
		tlv_type = ntohs(tlv.type);
		tlv_len = ntohs(tlv.length);
		if (tlv_len + TLV_HDR_SIZE > len) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg.id, msg.type);
			goto err;
		}
		buf += TLV_HDR_SIZE;
		len -= TLV_HDR_SIZE;

		/*
		 * For Label Mapping messages the Label TLV is mandatory and
		 * should appear right after the FEC TLV.
		 */
		if (current_tlv == 1 && type == MSG_TYPE_LABELMAPPING &&
		    !(tlv_type & TLV_TYPE_GENERICLABEL)) {
			send_notification(nbr->tcp, S_MISS_MSG, msg.id,
			    msg.type);
			goto err;
		}

		switch (tlv_type) {
		case TLV_TYPE_LABELREQUEST:
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
			case MSG_TYPE_LABELREQUEST:
				if (tlv_len != REQID_TLV_LEN) {
					session_shutdown(nbr, S_BAD_TLV_LEN,
					    msg.id, msg.type);
					goto err;
				}

				flags |= F_MAP_REQ_ID;
				memcpy(&reqbuf, buf, sizeof(reqbuf));
				reqid = ntohl(reqbuf);
				break;
			default:
				/* ignore */
				break;
			}
			break;
		case TLV_TYPE_HOPCOUNT:
		case TLV_TYPE_PATHVECTOR:
			/* ignore */
			break;
		case TLV_TYPE_GENERICLABEL:
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
			case MSG_TYPE_LABELWITHDRAW:
			case MSG_TYPE_LABELRELEASE:
				if (tlv_len != LABEL_TLV_LEN) {
					session_shutdown(nbr, S_BAD_TLV_LEN,
					    msg.id, msg.type);
					goto err;
				}

				memcpy(&labelbuf, buf, sizeof(labelbuf));
				label = ntohl(labelbuf);
				/* do not accept invalid labels */
				if (label > MPLS_LABEL_MAX ||
				    (label <= MPLS_LABEL_RESERVED_MAX &&
				     label != MPLS_LABEL_IPV4NULL &&
				     label != MPLS_LABEL_IPV6NULL &&
				     label != MPLS_LABEL_IMPLNULL)) {
					session_shutdown(nbr, S_BAD_TLV_VAL,
					    msg.id, msg.type);
					goto err;
				}
				break;
			default:
				/* ignore */
				break;
			}
			break;
		case TLV_TYPE_ATMLABEL:
		case TLV_TYPE_FRLABEL:
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
			case MSG_TYPE_LABELWITHDRAW:
			case MSG_TYPE_LABELRELEASE:
				/* unsupported */
				session_shutdown(nbr, S_BAD_TLV_VAL, msg.id,
				    msg.type);
				goto err;
				break;
			default:
				/* ignore */
				break;
			}
			break;
		case TLV_TYPE_STATUS:
			if (tlv_len != STATUS_TLV_LEN) {
				session_shutdown(nbr, S_BAD_TLV_LEN, msg.id,
				    msg.type);
				goto err;
			}
			/* ignore */
			break;
		case TLV_TYPE_PW_STATUS:
			switch (type) {
			case MSG_TYPE_LABELMAPPING:
				if (tlv_len != PW_STATUS_TLV_LEN) {
					session_shutdown(nbr, S_BAD_TLV_LEN,
					    msg.id, msg.type);
					goto err;
				}

				flags |= F_MAP_PW_STATUS;
				memcpy(&statusbuf, buf, sizeof(statusbuf));
				pw_status = ntohl(statusbuf);
				break;
			default:
				/* ignore */
				break;
			}
			break;
		default:
			if (!(ntohs(tlv.type) & UNKNOWN_FLAG))
				send_notification_rtlvs(nbr, S_UNKNOWN_TLV,
				    msg.id, msg.type, tlv_type, tlv_len, buf);
			/* ignore unknown tlv */
			break;
		}
		buf += tlv_len;
		len -= tlv_len;
		current_tlv++;
	}

	/* notify lde about the received message. */
	while ((me = TAILQ_FIRST(&mh)) != NULL) {
		int imsg_type = IMSG_NONE;

		me->map.flags |= flags;
		switch (me->map.type) {
		case MAP_TYPE_PREFIX:
			switch (me->map.fec.prefix.af) {
			case AF_INET:
				if (label == MPLS_LABEL_IPV6NULL) {
					session_shutdown(nbr, S_BAD_TLV_VAL,
					    msg.id, msg.type);
					goto err;
				}
				if (!nbr->v4_enabled)
					goto next;
				break;
			case AF_INET6:
				if (label == MPLS_LABEL_IPV4NULL) {
					session_shutdown(nbr, S_BAD_TLV_VAL,
					    msg.id, msg.type);
					goto err;
				}
				if (!nbr->v6_enabled)
					goto next;
				break;
			default:
				fatalx("recv_labelmessage: unknown af");
			}
			break;
		case MAP_TYPE_PWID:
			if (label <= MPLS_LABEL_RESERVED_MAX) {
				session_shutdown(nbr, S_BAD_TLV_VAL, msg.id,
				    msg.type);
				goto err;
			}
			if (me->map.flags & F_MAP_PW_STATUS)
				me->map.pw_status = pw_status;
			break;
		default:
			break;
		}
		me->map.label = label;
		if (me->map.flags & F_MAP_REQ_ID)
			me->map.requestid = reqid;

		log_msg_mapping(0, type, nbr, &me->map);

		switch (type) {
		case MSG_TYPE_LABELMAPPING:
			imsg_type = IMSG_LABEL_MAPPING;
			break;
		case MSG_TYPE_LABELREQUEST:
			imsg_type = IMSG_LABEL_REQUEST;
			break;
		case MSG_TYPE_LABELWITHDRAW:
			imsg_type = IMSG_LABEL_WITHDRAW;
			break;
		case MSG_TYPE_LABELRELEASE:
			imsg_type = IMSG_LABEL_RELEASE;
			break;
		case MSG_TYPE_LABELABORTREQ:
			imsg_type = IMSG_LABEL_ABORT;
			break;
		default:
			break;
		}

		ldpe_imsg_compose_lde(imsg_type, nbr->peerid, 0, &me->map,
		    sizeof(struct map));

 next:
		TAILQ_REMOVE(&mh, me, entry);
		free(me);
	}

	return (0);

 err:
	mapping_list_clr(&mh);

	return (-1);
}

/* Other TLV related functions */
static int
gen_label_tlv(struct ibuf *buf, uint32_t label)
{
	struct label_tlv	lt;

	lt.type = htons(TLV_TYPE_GENERICLABEL);
	lt.length = htons(LABEL_TLV_LEN);
	lt.label = htonl(label);

	return (ibuf_add(buf, &lt, sizeof(lt)));
}

static int
gen_reqid_tlv(struct ibuf *buf, uint32_t reqid)
{
	struct reqid_tlv	rt;

	rt.type = htons(TLV_TYPE_LABELREQUEST);
	rt.length = htons(REQID_TLV_LEN);
	rt.reqid = htonl(reqid);

	return (ibuf_add(buf, &rt, sizeof(rt)));
}

int
gen_pw_status_tlv(struct ibuf *buf, uint32_t status)
{
	struct pw_status_tlv	st;

	st.type = htons(TLV_TYPE_PW_STATUS);
	st.length = htons(PW_STATUS_TLV_LEN);
	st.value = htonl(status);

	return (ibuf_add(buf, &st, sizeof(st)));
}

uint16_t
len_fec_tlv(struct map *map)
{
	uint16_t	 len = TLV_HDR_SIZE;

	switch (map->type) {
	case MAP_TYPE_WILDCARD:
		len += FEC_ELM_WCARD_LEN;
		break;
	case MAP_TYPE_PREFIX:
		len += FEC_ELM_PREFIX_MIN_LEN +
		    PREFIX_SIZE(map->fec.prefix.prefixlen);
		break;
	case MAP_TYPE_PWID:
		len += FEC_PWID_ELM_MIN_LEN;
		if (map->flags & F_MAP_PW_ID)
			len += PW_STATUS_TLV_LEN;
		if (map->flags & F_MAP_PW_IFMTU)
			len += FEC_SUBTLV_IFMTU_SIZE;
    		if (map->flags & F_MAP_PW_STATUS)
			len += PW_STATUS_TLV_SIZE;
		break;
	case MAP_TYPE_TYPED_WCARD:
		len += FEC_ELM_TWCARD_MIN_LEN;
		switch (map->fec.twcard.type) {
		case MAP_TYPE_PREFIX:
		case MAP_TYPE_PWID:
			len += sizeof(uint16_t);
			break;
		default:
			fatalx("len_fec_tlv: unexpected fec type");
		}
		break;
	default:
		fatalx("len_fec_tlv: unexpected fec type");
	}

	return (len);
}

int
gen_fec_tlv(struct ibuf *buf, struct map *map)
{
	struct tlv	ft;
	uint16_t	family, len, pw_type, ifmtu;
	uint8_t		pw_len = 0, twcard_len;
	uint32_t	group_id, pwid;
	int		err = 0;

	ft.type = htons(TLV_TYPE_FEC);

	switch (map->type) {
	case MAP_TYPE_WILDCARD:
		ft.length = htons(sizeof(uint8_t));
		err |= ibuf_add(buf, &ft, sizeof(ft));
		err |= ibuf_add(buf, &map->type, sizeof(map->type));
		break;
	case MAP_TYPE_PREFIX:
		len = PREFIX_SIZE(map->fec.prefix.prefixlen);
		ft.length = htons(sizeof(map->type) + sizeof(family) +
		    sizeof(map->fec.prefix.prefixlen) + len);
		err |= ibuf_add(buf, &ft, sizeof(ft));
		err |= ibuf_add(buf, &map->type, sizeof(map->type));
		switch (map->fec.prefix.af) {
		case AF_INET:
			family = htons(AF_IPV4);
			break;
		case AF_INET6:
			family = htons(AF_IPV6);
			break;
		default:
			fatalx("gen_fec_tlv: unknown af");
			break;
		}
		err |= ibuf_add(buf, &family, sizeof(family));
		err |= ibuf_add(buf, &map->fec.prefix.prefixlen,
		    sizeof(map->fec.prefix.prefixlen));
		if (len)
			err |= ibuf_add(buf, &map->fec.prefix.prefix, len);
		break;
	case MAP_TYPE_PWID:
		if (map->flags & F_MAP_PW_ID)
			pw_len += FEC_PWID_SIZE;
		if (map->flags & F_MAP_PW_IFMTU)
			pw_len += FEC_SUBTLV_IFMTU_SIZE;

		len = FEC_PWID_ELM_MIN_LEN + pw_len;

		ft.length = htons(len);
		err |= ibuf_add(buf, &ft, sizeof(ft));

		err |= ibuf_add(buf, &map->type, sizeof(uint8_t));
		pw_type = map->fec.pwid.type;
		if (map->flags & F_MAP_PW_CWORD)
			pw_type |= CONTROL_WORD_FLAG;
		pw_type = htons(pw_type);
		err |= ibuf_add(buf, &pw_type, sizeof(uint16_t));
		err |= ibuf_add(buf, &pw_len, sizeof(uint8_t));
		group_id = htonl(map->fec.pwid.group_id);
		err |= ibuf_add(buf, &group_id, sizeof(uint32_t));
		if (map->flags & F_MAP_PW_ID) {
			pwid = htonl(map->fec.pwid.pwid);
			err |= ibuf_add(buf, &pwid, sizeof(uint32_t));
		}
		if (map->flags & F_MAP_PW_IFMTU) {
			struct subtlv 	stlv;

			stlv.type = SUBTLV_IFMTU;
			stlv.length = FEC_SUBTLV_IFMTU_SIZE;
			err |= ibuf_add(buf, &stlv, sizeof(uint16_t));

			ifmtu = htons(map->fec.pwid.ifmtu);
			err |= ibuf_add(buf, &ifmtu, sizeof(uint16_t));
		}
		break;
	case MAP_TYPE_TYPED_WCARD:
		len = FEC_ELM_TWCARD_MIN_LEN;
		switch (map->fec.twcard.type) {
		case MAP_TYPE_PREFIX:
		case MAP_TYPE_PWID:
			len += sizeof(uint16_t);
			break;
		default:
			fatalx("gen_fec_tlv: unexpected fec type");
		}
		ft.length = htons(len);
		err |= ibuf_add(buf, &ft, sizeof(ft));
		err |= ibuf_add(buf, &map->type, sizeof(uint8_t));
		err |= ibuf_add(buf, &map->fec.twcard.type, sizeof(uint8_t));

		switch (map->fec.twcard.type) {
		case MAP_TYPE_PREFIX:
			twcard_len = sizeof(uint16_t);
			err |= ibuf_add(buf, &twcard_len, sizeof(uint8_t));

			switch (map->fec.twcard.u.prefix_af) {
			case AF_INET:
				family = htons(AF_IPV4);
				break;
			case AF_INET6:
				family = htons(AF_IPV6);
				break;
			default:
				fatalx("gen_fec_tlv: unknown af");
				break;
			}

			err |= ibuf_add(buf, &family, sizeof(uint16_t));
			break;
		case MAP_TYPE_PWID:
			twcard_len = sizeof(uint16_t);
			err |= ibuf_add(buf, &twcard_len, sizeof(uint8_t));
			pw_type = htons(map->fec.twcard.u.pw_type);
			err |= ibuf_add(buf, &pw_type, sizeof(uint16_t));
			break;
		default:
			fatalx("gen_fec_tlv: unexpected fec type");
		}
		break;
	default:
		break;
	}

	return (err);
}

int
tlv_decode_fec_elm(struct nbr *nbr, struct ldp_msg *msg, char *buf,
    uint16_t len, struct map *map)
{
	uint16_t	off = 0;
	uint8_t		pw_len, twcard_len;

	map->type = *buf;
	off += sizeof(uint8_t);

	switch (map->type) {
	case MAP_TYPE_WILDCARD:
		if (len == FEC_ELM_WCARD_LEN)
			return (off);
		else {
			session_shutdown(nbr, S_BAD_TLV_VAL, msg->id,
			    msg->type);
			return (-1);
		}
		break;
	case MAP_TYPE_PREFIX:
		if (len < FEC_ELM_PREFIX_MIN_LEN) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		/* Address Family */
		memcpy(&map->fec.prefix.af, buf + off,
		    sizeof(map->fec.prefix.af));
		off += sizeof(map->fec.prefix.af);
		map->fec.prefix.af = ntohs(map->fec.prefix.af);
		switch (map->fec.prefix.af) {
		case AF_IPV4:
			map->fec.prefix.af = AF_INET;
			break;
		case AF_IPV6:
			map->fec.prefix.af = AF_INET6;
			break;
		default:
			send_notification(nbr->tcp, S_UNSUP_ADDR, msg->id,
			    msg->type);
			return (-1);
		}

		/* Prefix Length */
		map->fec.prefix.prefixlen = buf[off];
		off += sizeof(uint8_t);
		if (len < off + PREFIX_SIZE(map->fec.prefix.prefixlen)) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		/* Prefix */
		memset(&map->fec.prefix.prefix, 0,
		    sizeof(map->fec.prefix.prefix));
		memcpy(&map->fec.prefix.prefix, buf + off,
		    PREFIX_SIZE(map->fec.prefix.prefixlen));

		/* Just in case... */
		ldp_applymask(map->fec.prefix.af, &map->fec.prefix.prefix,
		    &map->fec.prefix.prefix, map->fec.prefix.prefixlen);

		return (off + PREFIX_SIZE(map->fec.prefix.prefixlen));
	case MAP_TYPE_PWID:
		if (len < FEC_PWID_ELM_MIN_LEN) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		/* PW type */
		memcpy(&map->fec.pwid.type, buf + off, sizeof(uint16_t));
		map->fec.pwid.type = ntohs(map->fec.pwid.type);
		if (map->fec.pwid.type & CONTROL_WORD_FLAG) {
			map->flags |= F_MAP_PW_CWORD;
			map->fec.pwid.type &= ~CONTROL_WORD_FLAG;
		}
		off += sizeof(uint16_t);

		/* PW info Length */
		pw_len = buf[off];
		off += sizeof(uint8_t);

		if (len != FEC_PWID_ELM_MIN_LEN + pw_len) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		/* Group ID */
		memcpy(&map->fec.pwid.group_id, buf + off, sizeof(uint32_t));
		map->fec.pwid.group_id = ntohl(map->fec.pwid.group_id);
		off += sizeof(uint32_t);

		/* PW ID */
		if (pw_len == 0)
			return (off);

		if (pw_len < sizeof(uint32_t)) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		memcpy(&map->fec.pwid.pwid, buf + off, sizeof(uint32_t));
		map->fec.pwid.pwid = ntohl(map->fec.pwid.pwid);
		map->flags |= F_MAP_PW_ID;
		off += sizeof(uint32_t);
		pw_len -= sizeof(uint32_t);

		/* Optional Interface Parameter Sub-TLVs */
		while (pw_len > 0) {
			struct subtlv 	stlv;

			if (pw_len < sizeof(stlv)) {
				session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
				    msg->type);
				return (-1);
			}

			memcpy(&stlv, buf + off, sizeof(stlv));
			if (stlv.length > pw_len) {
				session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
				    msg->type);
				return (-1);
			}

			switch (stlv.type) {
			case SUBTLV_IFMTU:
				if (stlv.length != FEC_SUBTLV_IFMTU_SIZE) {
					session_shutdown(nbr, S_BAD_TLV_LEN,
					    msg->id, msg->type);
					return (-1);
				}
				memcpy(&map->fec.pwid.ifmtu, buf + off +
				    SUBTLV_HDR_SIZE, sizeof(uint16_t));
				map->fec.pwid.ifmtu = ntohs(map->fec.pwid.ifmtu);
				map->flags |= F_MAP_PW_IFMTU;
				break;
			default:
				/* ignore */
				break;
			}
			off += stlv.length;
			pw_len -= stlv.length;
		}

		return (off);
	case MAP_TYPE_TYPED_WCARD:
		if (len < FEC_ELM_TWCARD_MIN_LEN) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		memcpy(&map->fec.twcard.type, buf + off, sizeof(uint8_t));
		off += sizeof(uint8_t);
		memcpy(&twcard_len, buf + off, sizeof(uint8_t));
		off += sizeof(uint8_t);
		if (len != FEC_ELM_TWCARD_MIN_LEN + twcard_len) {
			session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
			    msg->type);
			return (-1);
		}

		switch (map->fec.twcard.type) {
		case MAP_TYPE_PREFIX:
			if (twcard_len != sizeof(uint16_t)) {
				session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
				    msg->type);
				return (-1);
			}

			memcpy(&map->fec.twcard.u.prefix_af, buf + off,
			    sizeof(uint16_t));
			map->fec.twcard.u.prefix_af =
			    ntohs(map->fec.twcard.u.prefix_af);
			off += sizeof(uint16_t);

			switch (map->fec.twcard.u.prefix_af) {
			case AF_IPV4:
				map->fec.twcard.u.prefix_af = AF_INET;
				break;
			case AF_IPV6:
				map->fec.twcard.u.prefix_af = AF_INET6;
				break;
			default:
				session_shutdown(nbr, S_BAD_TLV_VAL, msg->id,
				    msg->type);
				return (-1);
			}
			break;
		case MAP_TYPE_PWID:
			if (twcard_len != sizeof(uint16_t)) {
				session_shutdown(nbr, S_BAD_TLV_LEN, msg->id,
				    msg->type);
				return (-1);
			}

			memcpy(&map->fec.twcard.u.pw_type, buf + off,
			    sizeof(uint16_t));
			map->fec.twcard.u.pw_type =
			    ntohs(map->fec.twcard.u.pw_type);
			/* ignore the reserved bit as per RFC 6667 */
			map->fec.twcard.u.pw_type &= ~PW_TWCARD_RESERVED_BIT;
			off += sizeof(uint16_t);
			break;
		default:
			send_notification(nbr->tcp, S_UNKNOWN_FEC, msg->id,
			    msg->type);
			return (-1);
		}

		return (off);
	default:
		send_notification(nbr->tcp, S_UNKNOWN_FEC, msg->id, msg->type);
		break;
	}

	return (-1);
}

static void
log_msg_mapping(int out, uint16_t msg_type, struct nbr *nbr, struct map *map)
{
	debug_msg(out, "%s: lsr-id %s, fec %s, label %s", msg_name(msg_type),
	    inet_ntoa(nbr->id), log_map(map), log_label(map->label));
}