aboutsummaryrefslogtreecommitdiffstats
path: root/gtp/gtpie.c
blob: 232183e4d5eb967cd279137ab41f30e665781f40 (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
/* 
 *  OpenGGSN - Gateway GPRS Support Node
 *  Copyright (C) 2002 Mondru AB.
 * 
 *  The contents of this file may be used under the terms of the GNU
 *  General Public License Version 2, provided that the above copyright
 *  notice and this permission notice is included in all copies or
 *  substantial portions of the software.
 * 
 */

/*
 * gtpie.c: Contains functions to encapsulate and decapsulate GTP 
 * information elements 
 *
 *
 * Encapsulation
 * - gtpie_tlv, gtpie_tv0, gtpie_tv1, gtpie_tv2 ... Adds information
 * elements to a buffer.
 *
 * Decapsulation
 *  - gtpie_decaps: Returns array with pointers to information elements.
 *  - getie_getie: Returns the pointer of a particular element.
 *  - gtpie_gettlv: Copies tlv information element. Return 0 on success.
 *  - gtpie_gettv: Copies tv information element. Return 0 on success.
 *
 */

#include <../config.h>

#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>

#include "gtpie.h"

int gtpie_tlv(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      int l, void *v)
{
	if ((*length + 3 + l) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tlv.t = hton8(t);
	((union gtpie_member *)(p + *length))->tlv.l = hton16(l);
	memcpy((void *)(p + *length + 3), v, l);
	*length += 3 + l;
	return 0;
}

int gtpie_tv0(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      int l, uint8_t * v)
{
	if ((*length + 1 + l) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tv0.t = hton8(t);
	memcpy((void *)(p + *length + 1), v, l);
	*length += 1 + l;
	return 0;
}

int gtpie_tv1(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      uint8_t v)
{
	if ((*length + 2) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tv1.t = hton8(t);
	((union gtpie_member *)(p + *length))->tv1.v = hton8(v);
	*length += 2;
	return 0;
}

int gtpie_tv2(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      uint16_t v)
{
	if ((*length + 3) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tv2.t = hton8(t);
	((union gtpie_member *)(p + *length))->tv2.v = hton16(v);
	*length += 3;
	return 0;
}

int gtpie_tv4(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      uint32_t v)
{
	if ((*length + 5) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tv4.t = hton8(t);
	((union gtpie_member *)(p + *length))->tv4.v = hton32(v);
	*length += 5;
	return 0;
}

int gtpie_tv8(void *p, unsigned int *length, unsigned int size, uint8_t t,
	      uint64_t v)
{
	if ((*length + 9) >= size)
		return 1;
	((union gtpie_member *)(p + *length))->tv8.t = hton8(t);
	((union gtpie_member *)(p + *length))->tv8.v = hton64(v);
	*length += 9;
	return 0;
}

int gtpie_getie(union gtpie_member *ie[], int type, int instance)
{
	int j;
	for (j = 0; j < GTPIE_SIZE; j++) {
		if ((ie[j] != 0) && (ie[j]->t == type)) {
			if (instance-- == 0)
				return j;
		}
	}
	return -1;
}

int gtpie_exist(union gtpie_member *ie[], int type, int instance)
{
	int j;
	for (j = 0; j < GTPIE_SIZE; j++) {
		if ((ie[j] != 0) && (ie[j]->t == type)) {
			if (instance-- == 0)
				return 1;
		}
	}
	return 0;
}

int gtpie_gettlv(union gtpie_member *ie[], int type, int instance,
		 unsigned int *length, void *dst, unsigned int size)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0) {
		*length = ntoh16(ie[ien]->tlv.l);
		if (*length <= size)
			memcpy(dst, ie[ien]->tlv.v, *length);
		else
			return EOF;
	}
	return 0;
}

int gtpie_gettv0(union gtpie_member *ie[], int type, int instance,
		 void *dst, unsigned int size)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0)
		memcpy(dst, ie[ien]->tv0.v, size);
	else
		return EOF;
	return 0;
}

int gtpie_gettv1(union gtpie_member *ie[], int type, int instance,
		 uint8_t * dst)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0)
		*dst = ntoh8(ie[ien]->tv1.v);
	else
		return EOF;
	return 0;
}

int gtpie_gettv2(union gtpie_member *ie[], int type, int instance,
		 uint16_t * dst)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0)
		*dst = ntoh16(ie[ien]->tv2.v);
	else
		return EOF;
	return 0;
}

int gtpie_gettv4(union gtpie_member *ie[], int type, int instance,
		 uint32_t * dst)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0)
		*dst = ntoh32(ie[ien]->tv4.v);
	else
		return EOF;
	return 0;
}

int gtpie_gettv8(union gtpie_member *ie[], int type, int instance,
		 uint64_t * dst)
{
	int ien;
	ien = gtpie_getie(ie, type, instance);
	if (ien >= 0)
		*dst = ntoh64(ie[ien]->tv8.v);
	else
		return EOF;
	return 0;
}

int gtpie_decaps(union gtpie_member *ie[], int version, void *pack,
		 unsigned len)
{
	int i;
	int j = 0;
	unsigned char *p;
	unsigned char *end;

	end = (unsigned char *)pack + len;
	p = pack;

	memset(ie, 0, sizeof(union gtpie_member *) * GTPIE_SIZE);

	while ((p < end) && (j < GTPIE_SIZE)) {
		if (GTPIE_DEBUG) {
			printf("The packet looks like this:\n");
			for (i = 0; i < (end - p); i++) {
				printf("%02x ",
				       (unsigned char)*(char *)(p + i));
				if (!((i + 1) % 16))
					printf("\n");
			};
			printf("\n");
		}

		switch (*p) {
		case GTPIE_CAUSE:	/* TV GTPIE types with value length 1 */
		case GTPIE_REORDER:
		case GTPIE_MAP_CAUSE:
		case GTPIE_MS_VALIDATED:
		case GTPIE_RECOVERY:
		case GTPIE_SELECTION_MODE:
		case GTPIE_TEARDOWN:
		case GTPIE_NSAPI:
		case GTPIE_RANAP_CAUSE:
		case GTPIE_RP_SMS:
		case GTPIE_RP:
		case GTPIE_MS_NOT_REACH:
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE TV1 found. Type %d, value %d\n",
					     ie[j]->tv1.t, ie[j]->tv1.v);
				p += 1 + 1;
				j++;
			}
			break;
		case GTPIE_FL_DI:	/* TV GTPIE types with value length 2 or 4 */
		case GTPIE_FL_C:
			if (version != 0) {
				if (j < GTPIE_SIZE) {	/* GTPIE_TEI_DI & GTPIE_TEI_C with length 4 */
					/* case GTPIE_TEI_DI: gtp1 */
					/* case GTPIE_TEI_C:  gtp1 */
					ie[j] = (union gtpie_member *)p;
					if (GTPIE_DEBUG)
						printf
						    ("GTPIE TV 4 found. Type %d, value %d\n",
						     ie[j]->tv4.t,
						     ie[j]->tv4.v);
					p += 1 + 4;
					j++;
				}
				break;
			}
		case GTPIE_PFI:	/* TV GTPIE types with value length 2 */
		case GTPIE_CHARGING_C:
		case GTPIE_TRACE_REF:
		case GTPIE_TRACE_TYPE:
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE TV2 found. Type %d, value %d\n",
					     ie[j]->tv2.t, ie[j]->tv2.v);
				p += 1 + 2;
				j++;
			}
			break;
		case GTPIE_QOS_PROFILE0:	/* TV GTPIE types with value length 3 */
		case GTPIE_P_TMSI_S:
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE TV 3 found. Type %d, value %d, %d, %d\n",
					     ie[j]->tv0.t, ie[j]->tv0.v[0],
					     ie[j]->tv0.v[1], ie[j]->tv0.v[2]);
				p += 1 + 3;
				j++;
			}
			break;
		case GTPIE_TLLI:	/* TV GTPIE types with value length 4 */
		case GTPIE_P_TMSI:
		case GTPIE_CHARGING_ID:
			/* case GTPIE_TEI_DI: Handled by GTPIE_FL_DI */
			/* case GTPIE_TEI_C:  Handled by GTPIE_FL_DI */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE TV 4 found. Type %d, value %d\n",
					     ie[j]->tv4.t, ie[j]->tv4.v);
				p += 1 + 4;
				j++;
			}
			break;
		case GTPIE_TEI_DII:	/* TV GTPIE types with value length 5 */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf("GTPIE TV 5 found. Type %d\n",
					       ie[j]->tv0.t);
				p += 1 + 5;
				j++;
			}
			break;
		case GTPIE_RAB_CONTEXT:	/* TV GTPIE types with value length 7 */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf("GTPIE TV 7 found. Type %d\n",
					       ie[j]->tv0.t);
				p += 1 + 7;
				j++;
			}
			break;
		case GTPIE_IMSI:	/* TV GTPIE types with value length 8 */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE_IMSI - GTPIE TV 8 found. Type %d, value 0x%llx\n",
					     ie[j]->tv0.t, ie[j]->tv8.v);
				p += 1 + 8;
				j++;
			}
			break;
		case GTPIE_RAI:	/* TV GTPIE types with value length 6 */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE_RAI - GTPIE TV 6 found. Type %d, value 0x%llx\n",
					     ie[j]->tv0.t, ie[j]->tv8.v);
				p += 1 + 6;
				j++;
			}
			break;
		case GTPIE_AUTH_TRIPLET:	/* TV GTPIE types with value length 28 */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf("GTPIE TV 28 found. Type %d\n",
					       ie[j]->tv0.t);
				p += 1 + 28;
				j++;
			}
			break;
		case GTPIE_EXT_HEADER_T:	/* GTP extension header */
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf
					    ("GTPIE GTP extension header found. Type %d\n",
					     ie[j]->ext.t);
				p += 2 + ntoh8(ie[j]->ext.l);
				j++;
			}
			break;
		case GTPIE_EUA:	/* TLV GTPIE types with variable length */
		case GTPIE_MM_CONTEXT:
		case GTPIE_PDP_CONTEXT:
		case GTPIE_APN:
		case GTPIE_PCO:
		case GTPIE_GSN_ADDR:
		case GTPIE_MSISDN:
		case GTPIE_QOS_PROFILE:
		case GTPIE_AUTH_QUINTUP:
		case GTPIE_TFT:
		case GTPIE_TARGET_INF:
		case GTPIE_UTRAN_TRANS:
		case GTPIE_RAB_SETUP:
		case GTPIE_TRIGGER_ID:
		case GTPIE_OMC_ID:
		case GTPIE_CHARGING_ADDR:
		case GTPIE_RAT_TYPE:
		case GTPIE_USER_LOC:
		case GTPIE_MS_TZ:
		case GTPIE_IMEI_SV:
		case GTPIE_PRIVATE:
			if (j < GTPIE_SIZE) {
				ie[j] = (union gtpie_member *)p;
				if (GTPIE_DEBUG)
					printf("GTPIE TLV found. Type %d\n",
					       ie[j]->tlv.t);
				p += 3 + ntoh16(ie[j]->tlv.l);
				j++;
			}
			break;
		default:
			if (GTPIE_DEBUG)
				printf("GTPIE something unknown. Type %d\n",
				       *p);
			return EOF;	/* We received something unknown */
		}
	}
	if (p == end) {
		if (GTPIE_DEBUG)
			printf("GTPIE normal return. %lx %lx\n",
			       (unsigned long)p, (unsigned long)end);
		return 0;	/* We landed at the end of the packet: OK */
	} else if (!(j < GTPIE_SIZE)) {
		if (GTPIE_DEBUG)
			printf("GTPIE too many elements.\n");
		return EOF;	/* We received too many information elements */
	} else {
		if (GTPIE_DEBUG)
			printf("GTPIE exceeded end of packet. %lx %lx\n",
			       (unsigned long)p, (unsigned long)end);
		return EOF;	/* We exceeded the end of the packet: Error */
	}
}

int gtpie_encaps(union gtpie_member *ie[], void *pack, unsigned *len)
{
	int i;
	unsigned char *p;
	unsigned char *end;
	union gtpie_member *m;
	int iesize;

	p = pack;

	memset(pack, 0, GTPIE_MAX);
	end = p + GTPIE_MAX;
	for (i = 1; i < GTPIE_SIZE; i++)
		if (ie[i] != 0) {
			if (GTPIE_DEBUG)
				printf("gtpie_encaps. Type %d\n", i);
			m = (union gtpie_member *)p;
			switch (i) {
			case GTPIE_CAUSE:	/* TV GTPIE types with value length 1 */
			case GTPIE_REORDER:
			case GTPIE_MAP_CAUSE:
			case GTPIE_MS_VALIDATED:
			case GTPIE_RECOVERY:
			case GTPIE_SELECTION_MODE:
			case GTPIE_TEARDOWN:
			case GTPIE_NSAPI:
			case GTPIE_RANAP_CAUSE:
			case GTPIE_RP_SMS:
			case GTPIE_RP:
			case GTPIE_MS_NOT_REACH:
				iesize = 2;
				break;
			case GTPIE_FL_DI:	/* TV GTPIE types with value length 2 */
			case GTPIE_FL_C:
			case GTPIE_PFI:
			case GTPIE_CHARGING_C:
			case GTPIE_TRACE_REF:
			case GTPIE_TRACE_TYPE:
				iesize = 3;
				break;
			case GTPIE_QOS_PROFILE0:	/* TV GTPIE types with value length 3 */
			case GTPIE_P_TMSI_S:
				iesize = 4;
				break;
			case GTPIE_TLLI:	/* TV GTPIE types with value length 4 */
			case GTPIE_P_TMSI:
				/* case GTPIE_TEI_DI: only in gtp1 */
				/* case GTPIE_TEI_C: only in gtp1 */
			case GTPIE_CHARGING_ID:
				iesize = 5;
				break;
			case GTPIE_TEI_DII:	/* TV GTPIE types with value length 5 */
				iesize = 6;
				break;
			case GTPIE_RAB_CONTEXT:	/* TV GTPIE types with value length 7 */
				iesize = 8;
				break;
			case GTPIE_IMSI:	/* TV GTPIE types with value length 8 */
			case GTPIE_RAI:
				iesize = 9;
				break;
			case GTPIE_AUTH_TRIPLET:	/* TV GTPIE types with value length 28 */
				iesize = 29;
				break;
			case GTPIE_EXT_HEADER_T:	/* GTP extension header */
				iesize = 2 + hton8(ie[i]->ext.l);
				break;
			case GTPIE_EUA:	/* TLV GTPIE types with length length 2 */
			case GTPIE_MM_CONTEXT:
			case GTPIE_PDP_CONTEXT:
			case GTPIE_APN:
			case GTPIE_PCO:
			case GTPIE_GSN_ADDR:
			case GTPIE_MSISDN:
			case GTPIE_QOS_PROFILE:
			case GTPIE_AUTH_QUINTUP:
			case GTPIE_TFT:
			case GTPIE_TARGET_INF:
			case GTPIE_UTRAN_TRANS:
			case GTPIE_RAB_SETUP:
			case GTPIE_TRIGGER_ID:
			case GTPIE_OMC_ID:
			case GTPIE_CHARGING_ADDR:
			case GTPIE_PRIVATE:
				iesize = 3 + hton16(ie[i]->tlv.l);
				break;
			default:
				return 2;	/* We received something unknown */
			}
			if (p + iesize < end) {
				memcpy(p, ie[i], iesize);
				p += iesize;
				*len += iesize;
			} else
				return 2;	/* Out of space */
		}
	return 0;
}

int gtpie_encaps2(union gtpie_member ie[], unsigned int size,
		  void *pack, unsigned *len)
{
	unsigned int i, j;
	unsigned char *p;
	unsigned char *end;
	union gtpie_member *m;
	int iesize;

	p = pack;

	memset(pack, 0, GTPIE_MAX);
	end = p + GTPIE_MAX;
	for (j = 0; j < GTPIE_SIZE; j++)
		for (i = 0; i < size; i++)
			if (ie[i].t == j) {
				if (GTPIE_DEBUG)
					printf
					    ("gtpie_encaps. Number %d, Type %d\n",
					     i, ie[i].t);
				m = (union gtpie_member *)p;
				switch (ie[i].t) {
				case GTPIE_CAUSE:	/* TV GTPIE types with value length 1 */
				case GTPIE_REORDER:
				case GTPIE_MAP_CAUSE:
				case GTPIE_MS_VALIDATED:
				case GTPIE_RECOVERY:
				case GTPIE_SELECTION_MODE:
				case GTPIE_TEARDOWN:
				case GTPIE_NSAPI:
				case GTPIE_RANAP_CAUSE:
				case GTPIE_RP_SMS:
				case GTPIE_RP:
				case GTPIE_MS_NOT_REACH:
					iesize = 2;
					break;
				case GTPIE_PFI:	/* TV GTPIE types with value length 2 */
				case GTPIE_CHARGING_C:
				case GTPIE_TRACE_REF:
				case GTPIE_TRACE_TYPE:
					iesize = 3;
					break;
				case GTPIE_QOS_PROFILE0:	/* TV GTPIE types with value length 3 */
				case GTPIE_P_TMSI_S:
					iesize = 4;
					break;
				case GTPIE_TLLI:	/* TV GTPIE types with value length 4 */
				case GTPIE_P_TMSI:
				case GTPIE_TEI_DI:
				case GTPIE_TEI_C:
					iesize = 5;
					break;
				case GTPIE_TEI_DII:	/* TV GTPIE types with value length 5 */
					iesize = 6;
					break;
				case GTPIE_RAB_CONTEXT:	/* TV GTPIE types with value length 7 */
					iesize = 8;
					break;
				case GTPIE_IMSI:	/* TV GTPIE types with value length 8 */
				case GTPIE_RAI:
					iesize = 9;
					break;
				case GTPIE_AUTH_TRIPLET:	/* TV GTPIE types with value length 28 */
					iesize = 29;
					break;
				case GTPIE_EXT_HEADER_T:	/* GTP extension header */
					iesize = 2 + hton8(ie[i].ext.l);
					break;
				case GTPIE_CHARGING_ID:	/* TLV GTPIE types with length length 2 */
				case GTPIE_EUA:
				case GTPIE_MM_CONTEXT:
				case GTPIE_PDP_CONTEXT:
				case GTPIE_APN:
				case GTPIE_PCO:
				case GTPIE_GSN_ADDR:
				case GTPIE_MSISDN:
				case GTPIE_QOS_PROFILE:
				case GTPIE_AUTH_QUINTUP:
				case GTPIE_TFT:
				case GTPIE_TARGET_INF:
				case GTPIE_UTRAN_TRANS:
				case GTPIE_RAB_SETUP:
				case GTPIE_TRIGGER_ID:
				case GTPIE_OMC_ID:
				case GTPIE_CHARGING_ADDR:
				case GTPIE_PRIVATE:
					iesize = 3 + hton16(ie[i].tlv.l);
					break;
				default:
					return 2;	/* We received something unknown */
				}
				if (p + iesize < end) {
					memcpy(p, &ie[i], iesize);
					p += iesize;
					*len += iesize;
				} else
					return 2;	/* Out of space */
			}
	return 0;
}