aboutsummaryrefslogtreecommitdiffstats
path: root/src/ranap_msg_factory.c
blob: ef3e9ef9f2bb7319d39cf7abefe9e0572497ea00 (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
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
/* high-level RANAP messsage generation code */

/* (C) 2015 by Harald Welte <laforge@gnumonks.org>
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <osmocom/core/utils.h>
#include <osmocom/core/msgb.h>

#include "asn1helpers.h"
#include <osmocom/ranap/iu_helpers.h>

#include <osmocom/ranap/ranap_common.h>
#include <osmocom/ranap/ranap_ies_defs.h>
#include <osmocom/ranap/ranap_msg_factory.h>

#define DRANAP _ranap_DRANAP

/*! \brief allocate a new long and assing a value to it */
static long *new_long(long in)
{
	long *out = CALLOC(1, sizeof(long));
	*out = in;
	return out;
}

/*! \brief generate RANAP RESET message */
struct msgb *ranap_new_msg_reset(RANAP_CN_DomainIndicator_t domain,
				 const RANAP_Cause_t *cause)
{
	RANAP_ResetIEs_t ies;
	RANAP_Reset_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	ies.cN_DomainIndicator = domain;
	if (cause)
		memcpy(&ies.cause, cause, sizeof(ies.cause));

	memset(&out, 0, sizeof(out));
	rc = ranap_encode_reseties(&out, &ies);
	if (rc < 0) {
		LOGP(DRANAP, LOGL_ERROR, "error encoding reset IEs: %d\n", rc);
		return NULL;
	}

	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_Reset,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_Reset,
						&out);

	/* release dynamic allocations attached to dt */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_Reset, &out);

	return msg;
}

/*! \brief generate RANAP RESET ACK message */
struct msgb *ranap_new_msg_reset_ack(RANAP_CN_DomainIndicator_t domain,
				     RANAP_GlobalRNC_ID_t *rnc_id)
{
	RANAP_ResetAcknowledgeIEs_t ies;
	RANAP_ResetAcknowledge_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	ies.cN_DomainIndicator = domain;

	/* The RNC shall include the globalRNC_ID in the RESET
	 * ACKNOWLEDGE message to the CN */
	if (rnc_id) {
		ies.presenceMask = RESETACKNOWLEDGEIES_RANAP_GLOBALRNC_ID_PRESENT;
		OCTET_STRING_noalloc(&ies.globalRNC_ID.pLMNidentity,
				     rnc_id->pLMNidentity.buf,
				     rnc_id->pLMNidentity.size);
		ies.globalRNC_ID.rNC_ID = rnc_id->rNC_ID;
	}

	/* FIXME: Do we need criticalityDiagnostics */

	memset(&out, 0, sizeof(out));
	rc = ranap_encode_resetacknowledgeies(&out, &ies);
	if (rc < 0) {
		LOGP(DRANAP, LOGL_ERROR, "error encoding reset ack IEs: %d\n", rc);
		return NULL;
	}

	msg = ranap_generate_successful_outcome(RANAP_ProcedureCode_id_Reset,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_ResetAcknowledge,
						&out);

	/* release dynamic allocations attached to dt */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_ResetAcknowledge, &out);

	return msg;
}

/*! \brief generate RANAP INITIAL UE message */
struct msgb *ranap_new_msg_initial_ue(uint32_t conn_id, int is_ps,
				     RANAP_GlobalRNC_ID_t *rnc_id,
				     uint8_t *nas_pdu, unsigned int nas_len)
{
	RANAP_InitialUE_MessageIEs_t ies;
	RANAP_InitialUE_Message_t out;
	struct msgb *msg;
	uint32_t ctxidbuf;
	int rc;
	uint16_t buf0 = 0x2342;

	memset(&ies, 0, sizeof(ies));
	if (is_ps)
		ies.cN_DomainIndicator = RANAP_CN_DomainIndicator_ps_domain;
	else
		ies.cN_DomainIndicator = RANAP_CN_DomainIndicator_cs_domain;

	OCTET_STRING_noalloc(&ies.lai.pLMNidentity, rnc_id->pLMNidentity.buf, rnc_id->pLMNidentity.size);
	OCTET_STRING_noalloc(&ies.lai.lAC, (uint8_t *)&buf0, sizeof(buf0));

	OCTET_STRING_noalloc(&ies.sai.pLMNidentity, rnc_id->pLMNidentity.buf, rnc_id->pLMNidentity.size);
	OCTET_STRING_noalloc(&ies.sai.lAC, (uint8_t *)&buf0, sizeof(buf0));
	OCTET_STRING_noalloc(&ies.sai.sAC, (uint8_t *)&buf0, sizeof(buf0));

	OCTET_STRING_noalloc(&ies.nas_pdu, nas_pdu, nas_len);
	asn1_u24_to_bitstring(&ies.iuSigConId, &ctxidbuf, conn_id);
	OCTET_STRING_noalloc(&ies.globalRNC_ID.pLMNidentity, rnc_id->pLMNidentity.buf, rnc_id->pLMNidentity.size);
	ies.globalRNC_ID.rNC_ID = rnc_id->rNC_ID;

	memset(&out, 0, sizeof(out));
	rc = ranap_encode_initialue_messageies(&out, &ies);
	if (rc < 0) {
		LOGP(DRANAP, LOGL_ERROR, "error encoding initial UE IEs: %d\n", rc);
		return NULL;
	}

	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_InitialUE_Message,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_InitialUE_Message,
						&out);

	/* release dynamic allocations attached to dt */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_InitialUE_Message, &out);

	return msg;
}


/*! \brief generate RANAP DIRECT TRANSFER message */
struct msgb *ranap_new_msg_dt(uint8_t sapi, const uint8_t *nas, unsigned int nas_len)
{
	RANAP_DirectTransferIEs_t ies;
	RANAP_DirectTransfer_t dt;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&dt, 0, sizeof(dt));

	/* only SAPI optional field shall be present for CN->RNC */
	ies.presenceMask = DIRECTTRANSFERIES_RANAP_SAPI_PRESENT;

	if (sapi == 3)
		ies.sapi = RANAP_SAPI_sapi_3;
	else
		ies.sapi = RANAP_SAPI_sapi_0;

	/* Avoid copying + later freeing of OCTET STRING */
	OCTET_STRING_noalloc(&ies.nas_pdu, nas, nas_len);

	/* ies -> dt */
	rc = ranap_encode_directtransferies(&dt, &ies);

	/* dt -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_DirectTransfer,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_DirectTransfer,
						&dt);

	/* release dynamic allocations attached to dt */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_DirectTransfer, &dt);

	return msg;
}

static const enum RANAP_IntegrityProtectionAlgorithm ip_alg[2] = {
	RANAP_IntegrityProtectionAlgorithm_standard_UMTS_integrity_algorithm_UIA1,
	RANAP_IntegrityProtectionAlgorithm_standard_UMTS_integrity_algorithm_UIA2,
};

static const RANAP_EncryptionAlgorithm_t enc_alg[2] = {
	RANAP_EncryptionAlgorithm_standard_UMTS_encryption_algorith_UEA1,
	RANAP_EncryptionAlgorithm_standard_UMTS_encryption_algorithm_UEA2,
};

/*! \brief generate RANAP SECURITY MODE COMMAND message */
struct msgb *ranap_new_msg_sec_mod_cmd(const uint8_t *ik, const uint8_t *ck, enum RANAP_KeyStatus status)
{
	RANAP_SecurityModeCommandIEs_t ies;
	RANAP_SecurityModeCommand_t out;
	struct msgb *msg;
	int i, rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	for (i = 0; i < ARRAY_SIZE(ip_alg); i++) {
		/* needs to be dynamically allocated, as
		 * SET_OF_free() will call FREEMEM() on it */
		RANAP_IntegrityProtectionAlgorithm_t *alg = CALLOC(1, sizeof(*alg));
		*alg = ip_alg[i];
		ASN_SEQUENCE_ADD(&ies.integrityProtectionInformation.permittedAlgorithms, alg);
	}

	BIT_STRING_fromBuf(&ies.integrityProtectionInformation.key, ik, 16*8);

	if (ck) {
		ies.presenceMask = SECURITYMODECOMMANDIES_RANAP_ENCRYPTIONINFORMATION_PRESENT;
		for (i = 0; i < ARRAY_SIZE(ip_alg); i++) {
			/* needs to be dynamically allocated, as
			 * SET_OF_free() will call FREEMEM() on it */
			RANAP_EncryptionAlgorithm_t *alg = CALLOC(1, sizeof(*alg));
			*alg = enc_alg[i];
			ASN_SEQUENCE_ADD(&ies.encryptionInformation.permittedAlgorithms, alg);
		}
		BIT_STRING_fromBuf(&ies.encryptionInformation.key, ck, 16*8);
	}

	ies.keyStatus = status;

	/* ies -> out */
	rc = ranap_encode_securitymodecommandies(&out, &ies);

	/* release dynamic allocations attached to ies */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_IntegrityProtectionInformation, &ies.integrityProtectionInformation);
	if (ck)
		ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_EncryptionInformation, &ies.encryptionInformation);

	/* out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_SecurityModeControl,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_SecurityModeCommand,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_SecurityModeCommand, &out);

	return msg;
}

/*! \brief generate RANAP SECURITY MODE COMPLETE message */
struct msgb *ranap_new_msg_sec_mod_compl(
	RANAP_ChosenIntegrityProtectionAlgorithm_t chosen_ip_alg,
	RANAP_ChosenEncryptionAlgorithm_t chosen_enc_alg)
{
	RANAP_SecurityModeCompleteIEs_t ies;
	RANAP_SecurityModeComplete_t out;
	struct msgb *msg;
	int i, rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	ies.presenceMask = SECURITYMODECOMPLETEIES_RANAP_CHOSENENCRYPTIONALGORITHM_PRESENT;
	ies.chosenIntegrityProtectionAlgorithm = chosen_ip_alg;
	ies.chosenEncryptionAlgorithm = chosen_enc_alg;

	/* ies -> out */
	rc = ranap_encode_securitymodecompleteies(&out, &ies);

	/* out -> msg */
	msg = ranap_generate_successful_outcome(RANAP_ProcedureCode_id_SecurityModeControl,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_SecurityModeComplete,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_SecurityModeComplete, &out);

	return msg;
}

/*! \brief generate RANAP COMMON ID message */
struct msgb *ranap_new_msg_common_id(const char *imsi)
{
	RANAP_CommonID_IEs_t ies;
	RANAP_CommonID_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	if (imsi) {
		uint8_t *imsi_buf = CALLOC(1, 16);
		rc = ranap_imsi_encode(imsi_buf, 16, imsi);
		ies.permanentNAS_UE_ID.present = RANAP_PermanentNAS_UE_ID_PR_iMSI;
		ies.permanentNAS_UE_ID.choice.iMSI.buf = imsi_buf;
		ies.permanentNAS_UE_ID.choice.iMSI.size = rc;
	} else
		ies.permanentNAS_UE_ID.present = RANAP_PermanentNAS_UE_ID_PR_NOTHING;

	/* ies -> out */
	rc = ranap_encode_commonid_ies(&out, &ies);
	/* release dynamic allocations attached to ies */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_PermanentNAS_UE_ID, &ies.permanentNAS_UE_ID);
	if (rc < 0)
		return NULL;

	/* out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_CommonID,
						RANAP_Criticality_ignore,
						&asn_DEF_RANAP_CommonID,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_CommonID, &out);

	return msg;
}

/*! \brief generate RANAP IU RELEASE COMMAND message */
struct msgb *ranap_new_msg_iu_rel_cmd(const RANAP_Cause_t *cause_in)
{
	RANAP_Iu_ReleaseCommandIEs_t ies;
	RANAP_Iu_ReleaseCommand_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	memcpy(&ies.cause, cause_in, sizeof(ies.cause));

	/* ies -> out */
	rc = ranap_encode_iu_releasecommandies(&out, &ies);
	if (rc < 0)
		return NULL;

	/* out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_Iu_Release,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_Iu_ReleaseCommand,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_Iu_ReleaseCommand, &out);

	return msg;
}

/*! \brief generate RAPAP IU RELEASE COMPLETE message */
struct msgb *ranap_new_msg_iu_rel_compl(void)
{
	RANAP_Iu_ReleaseCompleteIEs_t ies;
	RANAP_Iu_ReleaseComplete_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	/* ies -> out */
	rc = ranap_encode_iu_releasecompleteies(&out, &ies);
	if (rc < 0)
		return NULL;

	/* out -> msg */
	msg = ranap_generate_successful_outcome(RANAP_ProcedureCode_id_Iu_Release,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_Iu_ReleaseComplete,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_Iu_ReleaseComplete, &out);

	return msg;
}

/*! \brief generate RANAP PAGING COMMAND message */
struct msgb *ranap_new_msg_paging_cmd(const char *imsi, const uint32_t *tmsi, int is_ps, uint32_t cause)
{
	RANAP_PagingIEs_t ies;
	RANAP_Paging_t out;
	struct msgb *msg;
	uint8_t *imsi_buf = CALLOC(1, 16);
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	/* put together the 'ies' */
	if (is_ps)
		ies.cN_DomainIndicator = RANAP_CN_DomainIndicator_ps_domain;
	else
		ies.cN_DomainIndicator = RANAP_CN_DomainIndicator_cs_domain;

	rc = ranap_imsi_encode(imsi_buf, 16, imsi);
	ies.permanentNAS_UE_ID.present = RANAP_PermanentNAS_UE_ID_PR_iMSI;
	ies.permanentNAS_UE_ID.choice.iMSI.buf = imsi_buf;
	ies.permanentNAS_UE_ID.choice.iMSI.size = rc;

	if (tmsi) {
		uint32_t *tmsi_buf = CALLOC(1, sizeof(*tmsi_buf));
		ies.presenceMask |= PAGINGIES_RANAP_TEMPORARYUE_ID_PRESENT;
		if (is_ps) {
			ies.temporaryUE_ID.present = RANAP_TemporaryUE_ID_PR_p_TMSI;
			asn1_u32_to_str(&ies.temporaryUE_ID.choice.tMSI, tmsi_buf, *tmsi);
		} else {
			ies.temporaryUE_ID.present = RANAP_TemporaryUE_ID_PR_tMSI;
			asn1_u32_to_str(&ies.temporaryUE_ID.choice.p_TMSI, tmsi_buf, *tmsi);
		}
	}

	if (cause) {
		ies.presenceMask |= PAGINGIES_RANAP_PAGINGCAUSE_PRESENT;
		ies.pagingCause = cause;
	}

	/* ies -> out */
	rc = ranap_encode_pagingies(&out, &ies);
	/* release dynamic allocation attached to ies */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_PermanentNAS_UE_ID, &ies.permanentNAS_UE_ID);
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_TemporaryUE_ID, &ies.temporaryUE_ID);
	if (rc < 0)
		return NULL;

	/* out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_Paging,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_Paging,
						&out);

	/* release dynamic allocations attached to out */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_Paging, &out);

	return msg;
}

static RANAP_SDU_ErrorRatio_t *new_sdu_error_ratio(long mantissa, long exponent)
{
	RANAP_SDU_ErrorRatio_t *err = CALLOC(1, sizeof(*err));

	err->mantissa = mantissa;
	err->exponent = exponent;

	return err;
}


static RANAP_SDU_FormatInformationParameterItem_t *
new_format_info_pars(long sdu_size)
{
	RANAP_SDU_FormatInformationParameterItem_t *fmti = CALLOC(1, sizeof(*fmti));
	fmti->subflowSDU_Size = new_long(sdu_size);
	return fmti;
}

enum sdu_par_profile {
	SDUPAR_P_VOICE0,
	SDUPAR_P_VOICE1,
	SDUPAR_P_VOICE2,
	SDUPAR_P_DATA,
};

/* See Chapter 5 of TS 26.102 */
static RANAP_SDU_ParameterItem_t *new_sdu_par_item(enum sdu_par_profile profile)
{
	RANAP_SDU_ParameterItem_t *sdui = CALLOC(1, sizeof(*sdui));
	RANAP_SDU_FormatInformationParameters_t *fmtip = CALLOC(1, sizeof(*fmtip));
	RANAP_SDU_FormatInformationParameterItem_t *fmti;

	switch (profile) {
	case SDUPAR_P_VOICE0:
		sdui->sDU_ErrorRatio = new_sdu_error_ratio(1, 5);
		sdui->residualBitErrorRatio.mantissa = 1;
		sdui->residualBitErrorRatio.exponent = 6;
		sdui->deliveryOfErroneousSDU = RANAP_DeliveryOfErroneousSDU_yes;
		sdui->sDU_FormatInformationParameters = fmtip;
		fmti = new_format_info_pars(81);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		fmti = new_format_info_pars(39);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		/* FIXME: could be 10 SDU descriptors for AMR! */
		break;
	case SDUPAR_P_VOICE1:
		sdui->residualBitErrorRatio.mantissa = 1;
		sdui->residualBitErrorRatio.exponent = 3;
		sdui->deliveryOfErroneousSDU = RANAP_DeliveryOfErroneousSDU_no_error_detection_consideration;
		sdui->sDU_FormatInformationParameters = fmtip;
		fmti = new_format_info_pars(103);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		fmti = new_format_info_pars(0);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		/* FIXME: could be 10 SDU descriptors for AMR! */
		break;
	case SDUPAR_P_VOICE2:
		sdui->residualBitErrorRatio.mantissa = 5;
		sdui->residualBitErrorRatio.exponent = 3;
		sdui->deliveryOfErroneousSDU = RANAP_DeliveryOfErroneousSDU_no_error_detection_consideration;
		sdui->sDU_FormatInformationParameters = fmtip;
		fmti = new_format_info_pars(60);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		fmti = new_format_info_pars(0);
		ASN_SEQUENCE_ADD(fmtip, fmti);
		/* FIXME: could be 10 SDU descriptors for AMR! */
		break;
	case SDUPAR_P_DATA:
		sdui->sDU_ErrorRatio = new_sdu_error_ratio(1, 4);
		sdui->residualBitErrorRatio.mantissa = 1;
		sdui->residualBitErrorRatio.exponent = 5;
		sdui->deliveryOfErroneousSDU = RANAP_DeliveryOfErroneousSDU_no;
		FREEMEM(fmtip);
		break;
	}

	return sdui;
}

static RANAP_AllocationOrRetentionPriority_t *
new_alloc_ret_prio(RANAP_PriorityLevel_t level, int capability, int vulnerability,
		   int queueing_allowed)
{
	RANAP_AllocationOrRetentionPriority_t *arp = CALLOC(1, sizeof(*arp));

	arp->priorityLevel = level;

	if (capability)
		arp->pre_emptionCapability = RANAP_Pre_emptionCapability_may_trigger_pre_emption;
	else
		arp->pre_emptionCapability = RANAP_Pre_emptionCapability_shall_not_trigger_pre_emption;

	if (vulnerability)
		arp->pre_emptionVulnerability = RANAP_Pre_emptionVulnerability_pre_emptable;
	else
		arp->pre_emptionVulnerability = RANAP_Pre_emptionVulnerability_not_pre_emptable;

	if (queueing_allowed)
		arp->queuingAllowed = RANAP_QueuingAllowed_queueing_allowed;
	else
		arp->queuingAllowed = RANAP_QueuingAllowed_queueing_not_allowed;

	return arp;
}

/* See Chapter 5 of TS 26.102 */
static RANAP_RAB_Parameters_t *new_rab_par_voice(long bitrate_guaranteed,
						 long bitrate_max)
{
	RANAP_RAB_Parameters_t *rab = CALLOC(1, sizeof(*rab));
	RANAP_SDU_ParameterItem_t *sdui;

	rab->trafficClass = RANAP_TrafficClass_conversational;
	rab->rAB_AsymmetryIndicator = RANAP_RAB_AsymmetryIndicator_symmetric_bidirectional;

	ASN_SEQUENCE_ADD(&rab->maxBitrate.list, new_long(bitrate_max));
	rab->guaranteedBitRate = CALLOC(1, sizeof(*rab->guaranteedBitRate));
	ASN_SEQUENCE_ADD(rab->guaranteedBitRate, new_long(bitrate_guaranteed));
	rab->deliveryOrder = RANAP_DeliveryOrder_delivery_order_requested;
	rab->maxSDU_Size = 244;

	sdui = new_sdu_par_item(SDUPAR_P_VOICE0);
	ASN_SEQUENCE_ADD(&rab->sDU_Parameters, sdui);
	sdui = new_sdu_par_item(SDUPAR_P_VOICE1);
	ASN_SEQUENCE_ADD(&rab->sDU_Parameters, sdui);
	sdui = new_sdu_par_item(SDUPAR_P_VOICE2);
	ASN_SEQUENCE_ADD(&rab->sDU_Parameters, sdui);

	rab->transferDelay = new_long(80);
	rab->allocationOrRetentionPriority = new_alloc_ret_prio(RANAP_PriorityLevel_no_priority, 0, 1, 0);

	rab->sourceStatisticsDescriptor = new_long(RANAP_SourceStatisticsDescriptor_speech);

	return rab;
}

static RANAP_NAS_SynchronisationIndicator_t *new_rab_nas_sync_ind(int val)
{
	uint8_t val_buf = (val / 10) << 4;
	RANAP_NAS_SynchronisationIndicator_t *nsi = CALLOC(1, sizeof(*nsi));
	BIT_STRING_fromBuf(nsi, &val_buf, 4);
	return nsi;
}

static RANAP_RAB_Parameters_t *new_rab_par_data(uint32_t dl_max_bitrate, uint32_t ul_max_bitrate)
{
	RANAP_RAB_Parameters_t *rab = CALLOC(1, sizeof(*rab));
	RANAP_SDU_ParameterItem_t *sdui;

	rab->trafficClass = RANAP_TrafficClass_background;
	rab->rAB_AsymmetryIndicator = RANAP_RAB_AsymmetryIndicator_asymmetric_bidirectional;

	ASN_SEQUENCE_ADD(&rab->maxBitrate.list, new_long(dl_max_bitrate));
	ASN_SEQUENCE_ADD(&rab->maxBitrate.list, new_long(ul_max_bitrate));
	rab->deliveryOrder = RANAP_DeliveryOrder_delivery_order_requested;
	rab->maxSDU_Size = 8000;

	sdui = new_sdu_par_item(SDUPAR_P_DATA);
	ASN_SEQUENCE_ADD(&rab->sDU_Parameters, sdui);

	rab->allocationOrRetentionPriority = new_alloc_ret_prio(RANAP_PriorityLevel_no_priority, 0, 0, 0);

	RANAP_ProtocolExtensionField_t *pxf = CALLOC(1, sizeof(*pxf));
	pxf->id = RANAP_ProtocolIE_ID_id_RAB_Parameter_ExtendedMaxBitrateList;
	pxf->criticality = RANAP_Criticality_ignore;

	RANAP_RAB_Parameter_ExtendedMaxBitrateList_t *rab_mbrlist = CALLOC(1, sizeof(*rab_mbrlist));
	RANAP_ExtendedMaxBitrate_t *xmbr = CALLOC(1, sizeof(*xmbr));
	*xmbr = 42000000;
	ASN_SEQUENCE_ADD(&rab_mbrlist->list, xmbr);

	ANY_fromType_aper(&pxf->value, &asn_DEF_RANAP_RAB_Parameter_ExtendedMaxBitrateList, rab_mbrlist);

	ASN_STRUCT_FREE(asn_DEF_RANAP_RAB_Parameter_ExtendedMaxBitrateList, rab_mbrlist);

	rab->iE_Extensions = CALLOC(1, sizeof(*rab->iE_Extensions));
	ASN_SEQUENCE_ADD(&rab->iE_Extensions->list, pxf);

	return rab;
}

static void new_transp_layer_addr(BIT_STRING_t *out, uint32_t ip, bool use_x213_nsap)
{
	uint8_t *buf;
	unsigned int len;

	if (use_x213_nsap) {
		len = 160/8;
		buf = CALLOC(len, sizeof(uint8_t));
		buf[0] = 0x35;	/* AFI For IANA ICP */
		buf[1] = 0x00;	/* See A.5.2.1.2.7 of X.213 */
		buf[2] = 0x01;
		*(uint32_t *)&buf[3] = ntohl(ip);
	} else {
		len = 4;
		buf = CALLOC(len, sizeof(uint8_t));
		*(uint32_t *)buf = ntohl(ip);
	}
	out->buf = buf;
	out->size = len;
	out->bits_unused = 0;
}

static RANAP_TransportLayerInformation_t *new_transp_info_rtp(uint32_t ip, uint16_t port,
							      bool use_x213_nsap)
{
	RANAP_TransportLayerInformation_t *tli = CALLOC(1, sizeof(*tli));
	uint8_t binding_id[4];

	binding_id[0] = port >> 8;
	binding_id[1] = port & 0xff;
	binding_id[2] = binding_id[3] = 0;

	new_transp_layer_addr(&tli->transportLayerAddress, ip, use_x213_nsap);
	tli->iuTransportAssociation.present = RANAP_IuTransportAssociation_PR_bindingID;
	OCTET_STRING_fromBuf(&tli->iuTransportAssociation.choice.bindingID,
				(const char *) binding_id, sizeof(binding_id));

	return tli;
}

static RANAP_TransportLayerInformation_t *new_transp_info_gtp(uint32_t ip, uint32_t tei,
							      bool use_x213_nsap)
{
	RANAP_TransportLayerInformation_t *tli = CALLOC(1, sizeof(*tli));
	uint32_t binding_buf = htonl(tei);

	new_transp_layer_addr(&tli->transportLayerAddress, ip, use_x213_nsap);
	tli->iuTransportAssociation.present = RANAP_IuTransportAssociation_PR_gTP_TEI;
	OCTET_STRING_fromBuf(&tli->iuTransportAssociation.choice.gTP_TEI,
			     (const char *) &binding_buf, sizeof(binding_buf));

	return tli;
}

static RANAP_UserPlaneInformation_t *new_upi(long mode, uint8_t mode_versions)
{
	RANAP_UserPlaneInformation_t *upi = CALLOC(1, sizeof(*upi));
	uint16_t *buf = CALLOC(1, sizeof(*buf));

	*buf = ntohs(mode_versions);

	upi->userPlaneMode = mode;
	upi->uP_ModeVersions.buf = (uint8_t *) buf;
	upi->uP_ModeVersions.size = sizeof(*buf);
	upi->uP_ModeVersions.bits_unused = 0;

	return upi;
}


static void assign_new_ra_id(RANAP_RAB_ID_t *id, uint8_t rab_id)
{
	uint8_t *buf = CALLOC(1, sizeof(*buf));
	*buf = rab_id;

	id->buf = buf;
	id->size = 1;
	id->bits_unused = 0;
}

/*! \brief generate RANAP RAB ASSIGNMENT REQUEST message for CS (voice).
 * See 3GPP TS 25.413 8.2.
 * RAB ID: 3GPP TS 25.413 9.2.1.2.
 * \param rtp_ip  MGW's RTP IPv4 address in *network* byte order.
 */
struct msgb *ranap_new_msg_rab_assign_voice(uint8_t rab_id, uint32_t rtp_ip,
					    uint16_t rtp_port,
					    bool use_x213_nsap)
{
	RANAP_ProtocolIE_FieldPair_t *pair;
	RANAP_RAB_AssignmentRequestIEs_t ies;
	RANAP_RAB_AssignmentRequest_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	/* only assingnment is present, no release */
	ies.presenceMask = RAB_ASSIGNMENTREQUESTIES_RANAP_RAB_SETUPORMODIFYLIST_PRESENT;

	/* put together the 'First' part */
	RANAP_RAB_SetupOrModifyItemFirst_t first;
	memset(&first, 0, sizeof(first));
	assign_new_ra_id(&first.rAB_ID, rab_id);
	first.nAS_SynchronisationIndicator = new_rab_nas_sync_ind(60);
	first.rAB_Parameters = new_rab_par_voice(6700, 12200);
	first.userPlaneInformation = new_upi(RANAP_UserPlaneMode_support_mode_for_predefined_SDU_sizes, 1); /* 2? */
	first.transportLayerInformation = new_transp_info_rtp(rtp_ip, rtp_port,
							      use_x213_nsap);

	/* put together the 'Second' part */
	RANAP_RAB_SetupOrModifyItemSecond_t second;
	memset(&second, 0, sizeof(second));

	/* Build an IE Pair out of first and second part:
	 * (first, second) -> pair */
	pair = ranap_new_ie_pair(RANAP_ProtocolIE_ID_id_RAB_SetupOrModifyItem,
				 RANAP_Criticality_reject,
				 &asn_DEF_RANAP_RAB_SetupOrModifyItemFirst, &first,
				 RANAP_Criticality_ignore,
				 &asn_DEF_RANAP_RAB_SetupOrModifyItemSecond, &second);

	/* the pair has been made, we can release any of its elements */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemFirst, &first);
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemSecond, &second);

	RANAP_ProtocolIE_ContainerPair_t *container_pair = CALLOC(1, sizeof(*container_pair));
	/* Add the pair to the list of IEs of the RAB ass.req */
	ASN_SEQUENCE_ADD(container_pair, pair);
	ASN_SEQUENCE_ADD(&ies.raB_SetupOrModifyList.list, container_pair);

	/* encode the IEs into the actual assignment request:
	 * ies -> out */
	rc = ranap_encode_rab_assignmentrequesties(&out, &ies);
	/* 'out' has been generated, we can now release the input */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyList,
				      &ies.raB_SetupOrModifyList);
	if (rc < 0)
		return NULL;

	/* generate an Initiating Mesasage: out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_RAB_Assignment,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_RAB_AssignmentRequest, &out);

	/* 'msg' has been generated, we cann now release the input 'out' */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_AssignmentRequest, &out);

	return msg;
}

/*! \brief generate RANAP RAB ASSIGNMENT REQUEST message for PS (data)
 * \param gtp_ip  SGSN's GTP IPv4 address in *network* byte order. */
struct msgb *ranap_new_msg_rab_assign_data(uint8_t rab_id, uint32_t gtp_ip,
					   uint32_t gtp_tei, bool use_x213_nsap)
{
	RANAP_ProtocolIE_FieldPair_t *pair;
	RANAP_RAB_AssignmentRequestIEs_t ies;
	RANAP_RAB_AssignmentRequest_t out;
	RANAP_DataVolumeReportingIndication_t *dat_vol_ind;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	/* only assingnment is present, no release */
	ies.presenceMask = RAB_ASSIGNMENTREQUESTIES_RANAP_RAB_SETUPORMODIFYLIST_PRESENT;

	/* put together the 'First' part */
	RANAP_RAB_SetupOrModifyItemFirst_t first;
	memset(&first, 0, sizeof(first));
	assign_new_ra_id(&first.rAB_ID, rab_id);
	//first.nAS_SynchronisationIndicator = FIXME;

	first.rAB_Parameters = new_rab_par_data(1600000, 800000);
	first.userPlaneInformation = new_upi(RANAP_UserPlaneMode_transparent_mode, 1);
	first.transportLayerInformation = new_transp_info_gtp(gtp_ip, gtp_tei,
							      use_x213_nsap);

	/* put together the 'Second' part */
	RANAP_RAB_SetupOrModifyItemSecond_t second;
	memset(&second, 0, sizeof(second));
	second.pDP_TypeInformation = CALLOC(1, sizeof(*second.pDP_TypeInformation));
	ASN_SEQUENCE_ADD(second.pDP_TypeInformation, new_long(RANAP_PDP_Type_ipv4));
	dat_vol_ind = CALLOC(1, sizeof(*dat_vol_ind));
	*dat_vol_ind = RANAP_DataVolumeReportingIndication_do_not_report;
	second.dataVolumeReportingIndication = dat_vol_ind;
	second.dl_GTP_PDU_SequenceNumber = new_long(0);
	second.ul_GTP_PDU_SequenceNumber = new_long(0);

	/* Build an IE Pair out of first and second part:
	 * (first, second) -> pair */
	pair = ranap_new_ie_pair(RANAP_ProtocolIE_ID_id_RAB_SetupOrModifyItem,
				 RANAP_Criticality_reject,
				 &asn_DEF_RANAP_RAB_SetupOrModifyItemFirst,
				 &first, RANAP_Criticality_ignore,
				 &asn_DEF_RANAP_RAB_SetupOrModifyItemSecond,
				 &second);

	/* the pair has been made, we can release any of its elements */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemFirst, &first);
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyItemSecond, &second);

	RANAP_ProtocolIE_ContainerPair_t *container_pair = CALLOC(1, sizeof(*container_pair));
	/* Add the pair to the list of IEs of the RAB ass.req */
	ASN_SEQUENCE_ADD(&container_pair->list, pair);
	/* Add the pair to the list of IEs of the RAB ass.req */
	ASN_SEQUENCE_ADD(&ies.raB_SetupOrModifyList.list, container_pair);

	/* encode the IEs into the actual assignment request:
	 * ies -> out */
	rc = ranap_encode_rab_assignmentrequesties(&out, &ies);
	/* 'out' has been generated, we can now release the input */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_SetupOrModifyList,
				      &ies.raB_SetupOrModifyList);
	if (rc < 0)
		return NULL;

	/* generate an Initiating Mesasage: out -> msg */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_RAB_Assignment,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_RAB_AssignmentRequest, &out);

	/* 'msg' has been generated, we cann now release the input 'out' */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_AssignmentRequest, &out);

	return msg;
}

struct msgb *ranap_new_msg_iu_rel_req(const RANAP_Cause_t *cause)
{
	RANAP_Iu_ReleaseRequestIEs_t ies;
	RANAP_Iu_ReleaseRequest_t out;
	struct msgb *msg;
	int rc;

	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	memcpy(&ies.cause, cause, sizeof(ies.cause));

	rc = ranap_encode_iu_releaserequesties(&out, &ies);
	if (rc < 0)
		return NULL;

	/* encode the output into the msgb */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_Iu_ReleaseRequest,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_Iu_ReleaseRequest, &out);
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_Iu_ReleaseRequest, &out);

	return msg;
}

struct msgb *ranap_new_msg_rab_rel_req(uint8_t rab_id, const RANAP_Cause_t *cause)
{
	RANAP_RAB_ReleaseItemIEs_t item_ies;
	RANAP_RAB_ReleaseRequestIEs_t ies;
	RANAP_RAB_ReleaseRequest_t out;
	struct msgb *msg;
	int rc;

	memset(&item_ies, 0, sizeof(item_ies));
	memset(&ies, 0, sizeof(ies));
	memset(&out, 0, sizeof(out));

	/* put together the ReleaseItem */
	assign_new_ra_id(&item_ies.raB_ReleaseItem.rAB_ID, rab_id);
	memcpy(&item_ies.raB_ReleaseItem.cause, cause, sizeof(item_ies.raB_ReleaseItem.cause));

	/* add to the list */
	rc = ranap_encode_rab_releaseitemies(&ies.raB_ReleaseList, &item_ies);
	if (rc < 0)
		return NULL;
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_ReleaseItem, &item_ies.raB_ReleaseItem);

	/* encoe the list IEs into the output */
	rc = ranap_encode_rab_releaserequesties(&out, &ies);
	if (rc < 0)
		return NULL;
	/* 'out' has been generated, we can release the input */
	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_ReleaseList, &ies.raB_ReleaseList);

	/* encode the output into the msgb */
	msg = ranap_generate_initiating_message(RANAP_ProcedureCode_id_RAB_ReleaseRequest,
						RANAP_Criticality_reject,
						&asn_DEF_RANAP_RAB_ReleaseRequest, &out);

	ASN_STRUCT_FREE_CONTENTS_ONLY(asn_DEF_RANAP_RAB_ReleaseRequest, &out);

	return msg;
}