summaryrefslogtreecommitdiffstats
path: root/tests/lapd/lapd_test.c
blob: 1f986bc8f83fa8ea9df3ef806ec8b7abfd437006 (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
/*
 * (C) 2011 by Holger Hans Peter Freyther
 * (C) 2011 by On-Waves
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <osmocom/core/application.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/utils.h>
#include <osmocom/gsm/lapdm.h>
#include <osmocom/gsm/rsl.h>

#include <errno.h>

#include <string.h>

#define CHECK_RC(rc)	\
	if (rc != 0) {	\
		printf("Operation failed rc=%d on %s:%d\n", rc, __FILE__, __LINE__); \
		abort(); \
	}

static struct log_info info = {};

struct lapdm_polling_state {
	struct lapdm_channel *bts;
	int bts_read;

	struct lapdm_channel *ms;
	int ms_read;
};

static struct msgb *msgb_from_array(const uint8_t *data, int len)
{
	struct msgb *msg = msgb_alloc_headroom(4096, 128, "data");
	msg->l3h = msgb_put(msg, len);
	memcpy(msg->l3h, data, len);
	return msg;
}

/*
 * Test data is below...
 */
static const uint8_t cm[] = {
	0x05, 0x24, 0x31, 0x03, 0x50, 0x18, 0x93, 0x08,
	0x29, 0x47, 0x80, 0x00, 0x00, 0x00, 0x00, 0x80,
};

static const uint8_t ua[] = {
	0x01, 0x73, 0x41, 0x05, 0x24, 0x31, 0x03, 0x50,
	0x18, 0x93, 0x08, 0x29, 0x47, 0x80, 0x00, 0x00,
	0x00, 0x00, 0x80, 0x2b, 0x2b, 0x2b, 0x2b
};

static const uint8_t mm[] = {
	0x00, 0x0c, 0x00, 0x03, 0x01, 0x01, 0x20, 0x02,
	0x00, 0x0b, 0x00, 0x03, 0x05, 0x04, 0x0d
};

static const uint8_t dummy1[] = {
	0xab, 0x03, 0x30, 0x60, 0x06,
};

static const uint8_t rel_req[] = {
	0x02, 0x07, 0x01, 0x0a, 0x02, 0x40, 0x14, 0x01
};

static struct msgb *create_cm_serv_req(void)
{
	struct msgb *msg;

	msg = msgb_from_array(cm, sizeof(cm));
	rsl_rll_push_l3(msg, RSL_MT_EST_REQ, 0, 0, 1);
	return msg;
}

static struct msgb *create_mm_id_req(void)
{
	struct msgb *msg;

	msg = msgb_from_array(mm, sizeof(mm));
	msg->l2h = msg->data + 3;
	OSMO_ASSERT(msgb_l2len(msg) == 12);
	msg->l3h = msg->l2h + 6;
	OSMO_ASSERT(msgb_l3len(msg) == 6);

	return msg;
}

static struct msgb *create_empty_msg(void)
{
	struct msgb *msg;

	msg = msgb_from_array(NULL, 0);
	OSMO_ASSERT(msgb_l3len(msg) == 0);
	rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, 0, 0, 1);
	return msg;
}

static struct msgb *create_dummy_data_req(void)
{
	struct msgb *msg;

	msg = msgb_from_array(dummy1, sizeof(dummy1));
	rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, 0, 0, 1);
	return msg;
}

static struct msgb *create_rel_req(void)
{
	struct msgb *msg;

	msg = msgb_from_array(rel_req, sizeof(rel_req));
	msg->l2h = msg->data;
	msg->l3h = msg->l2h + sizeof(struct abis_rsl_rll_hdr);
	return msg;
}

static int send(struct msgb *in_msg, struct lapdm_channel *chan)
{
	struct osmo_phsap_prim pp;
	struct msgb *msg;
	int rc;

	msg = msgb_alloc_headroom(128, 64, "PH-DATA.ind");
	osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
			PRIM_OP_INDICATION, msg);
	/* copy over actual MAC block */
	msg->l2h = msgb_put(msg, msgb_l2len(in_msg));
	memcpy(msg->l2h, in_msg->l2h, msgb_l2len(in_msg));

	/* LAPDm requires those... */
	pp.u.data.chan_nr = 0;
	pp.u.data.link_id = 0;
        /* feed into the LAPDm code of libosmogsm */
        rc = lapdm_phsap_up(&pp.oph, &chan->lapdm_dcch);
	OSMO_ASSERT(rc == 0 || rc == -EBUSY);
	return 0;
}

static int send_sabm(struct lapdm_channel *chan, int second_ms)
{
	struct osmo_phsap_prim pp;
	struct msgb *msg;
	int rc;

	msg = msgb_alloc_headroom(128, 64, "PH-DATA.ind");
	osmo_prim_init(&pp.oph, SAP_GSM_PH, PRIM_PH_DATA,
			PRIM_OP_INDICATION, msg);
	/* copy over actual MAC block */
	msg->l2h = msgb_put(msg, 23);
	msg->l2h[0] = 0x01;
	msg->l2h[1] = 0x3f;
	msg->l2h[2] = 0x01 | (sizeof(cm) << 2);
	memcpy(msg->l2h + 3, cm, sizeof(cm));
	msg->l2h[3] += second_ms; /* alter message, for second mobile */

	/* LAPDm requires those... */
	pp.u.data.chan_nr = 0;
	pp.u.data.link_id = 0;
        /* feed into the LAPDm code of libosmogsm */
        rc = lapdm_phsap_up(&pp.oph, &chan->lapdm_dcch);
	OSMO_ASSERT(rc == 0 || rc == -EBUSY);
	return 0;
}

/*
 * I get called from the LAPDm code when something was sent my way...
 */
static int bts_to_ms_tx_cb(struct msgb *in_msg, struct lapdm_entity *le, void *_ctx)
{
	struct lapdm_polling_state *state = _ctx;


	printf("%s: MS->BTS(us) message %d\n", __func__, msgb_length(in_msg));


	if (state->bts_read == 0) {
		printf("BTS: Verifying CM request.\n");
		OSMO_ASSERT(msgb_l3len(in_msg) == ARRAY_SIZE(cm));
		OSMO_ASSERT(memcmp(in_msg->l3h, cm,
			ARRAY_SIZE(cm)) == 0);
	} else if (state->bts_read == 1) {
		printf("BTS: Verifying dummy message.\n");
		OSMO_ASSERT(msgb_l3len(in_msg) == ARRAY_SIZE(dummy1));
		OSMO_ASSERT(memcmp(in_msg->l3h, dummy1,
			ARRAY_SIZE(dummy1)) == 0);
	} else {
		printf("BTS: Do not know to verify: %d\n", state->bts_read);
	}

	state->bts_read += 1;
	msgb_free(in_msg);

	return 0;
}

static int ms_to_bts_l1_cb(struct osmo_prim_hdr *oph, void *_ctx)
{
	int rc;
	struct lapdm_polling_state *state = _ctx;
	printf("%s: MS(us) -> BTS prim message\n", __func__);

	/* i stuff it into the LAPDm channel of the BTS */
	rc = send(oph->msg, state->bts);
	msgb_free(oph->msg);
	return rc;
}

static int ms_to_bts_tx_cb(struct msgb *msg, struct lapdm_entity *le, void *_ctx)
{
	struct lapdm_polling_state *state = _ctx;

	printf("%s: BTS->MS(us) message %d\n", __func__, msgb_length(msg));

	if (state->ms_read == 0) {
		struct abis_rsl_rll_hdr hdr;

		printf("MS: Verifying incoming primitive.\n");
		OSMO_ASSERT(msg->len == sizeof(struct abis_rsl_rll_hdr) + 3);

		/* verify the header */
		memset(&hdr, 0, sizeof(hdr));
		rsl_init_rll_hdr(&hdr, RSL_MT_EST_CONF);
		hdr.c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
		OSMO_ASSERT(memcmp(msg->data, &hdr, sizeof(hdr)) == 0);

		/* Verify the added RSL_IE_L3_INFO but we have a bug here */
		OSMO_ASSERT(msg->data[6] == RSL_IE_L3_INFO);
		#warning "RSL_IE_L3_INFO 16 bit length is wrong"
		/* This should be okay but it is actually 0x0, 0x9c on ia-32 */
		/* OSMO_ASSERT(msg->data[7] == 0x0 && msg->data[8] == 0x0); */
	} else if (state->ms_read == 1) {
		printf("MS: Verifying incoming MM message: %d\n", msgb_l3len(msg));
		OSMO_ASSERT(msgb_l3len(msg) == 3);
		OSMO_ASSERT(memcmp(msg->l3h, &mm[12], msgb_l3len(msg)) == 0);
	} else {
		printf("MS: Do not know to verify: %d\n", state->ms_read);
	}

	state->ms_read += 1;
	msgb_free(msg);
	return 0;
}

static void test_lapdm_polling()
{
	printf("I do some very simple LAPDm test.\n");

	int rc;
	struct lapdm_polling_state test_state;
	struct osmo_phsap_prim pp;

	/* Configure LAPDm on both sides */
	struct lapdm_channel bts_to_ms_channel;
	struct lapdm_channel ms_to_bts_channel;
	memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));
	memset(&ms_to_bts_channel, 0, sizeof(ms_to_bts_channel));

	memset(&test_state, 0, sizeof(test_state));
	test_state.bts = &bts_to_ms_channel;
	test_state.ms = &ms_to_bts_channel;

	/* BTS to MS in polling mode */
	lapdm_channel_init(&bts_to_ms_channel, LAPDM_MODE_BTS);
        lapdm_channel_set_flags(&bts_to_ms_channel, LAPDM_ENT_F_POLLING_ONLY);
        lapdm_channel_set_l1(&bts_to_ms_channel, NULL, &test_state);
        lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_tx_cb, &test_state);

	/* MS to BTS in direct mode */
	lapdm_channel_init(&ms_to_bts_channel, LAPDM_MODE_MS);
	lapdm_channel_set_l1(&ms_to_bts_channel, ms_to_bts_l1_cb, &test_state);
	lapdm_channel_set_l3(&ms_to_bts_channel, ms_to_bts_tx_cb, &test_state);

	/*
	 * We try to send messages from the MS to the BTS to the MS..
	 */
	/* 1. Start with MS -> BTS, BTS should have a pending message */
	printf("Establishing link.\n");
	lapdm_rslms_recvmsg(create_cm_serv_req(), &ms_to_bts_channel);

	/* 2. Poll on the BTS for sending out a confirmation */
	printf("\nConfirming\n");
	OSMO_ASSERT(test_state.bts_read == 1);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	CHECK_RC(rc);
	OSMO_ASSERT(pp.oph.msg->data == pp.oph.msg->l2h);
	send(pp.oph.msg, &ms_to_bts_channel);
	msgb_free(pp.oph.msg);
	OSMO_ASSERT(test_state.ms_read == 1);

	/* 3. Send some data to the MS */
	printf("\nSending back to MS\n");
	lapdm_rslms_recvmsg(create_mm_id_req(), &bts_to_ms_channel);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	CHECK_RC(rc);
	send(pp.oph.msg, &ms_to_bts_channel);
	msgb_free(pp.oph.msg);
	OSMO_ASSERT(test_state.ms_read == 2);

	/* verify that there is nothing more to poll */
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	OSMO_ASSERT(rc < 0);

	/* 3. And back to the BTS */
	printf("\nSending back to BTS\n");
	OSMO_ASSERT(test_state.ms_read == 2);
	lapdm_rslms_recvmsg(create_dummy_data_req(), &ms_to_bts_channel);


	/* 4. And back to the MS, but let's move data/l2h apart */
	OSMO_ASSERT(test_state.bts_read == 2);
	OSMO_ASSERT(test_state.ms_read == 2);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	CHECK_RC(rc);
	send(pp.oph.msg, &ms_to_bts_channel);
	OSMO_ASSERT(test_state.ms_read == 2);
	msgb_free(pp.oph.msg);

	/* verify that there is nothing more to poll */
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	OSMO_ASSERT(rc < 0);

	/* check sending an empty L3 message fails */
	rc = lapdm_rslms_recvmsg(create_empty_msg(), &bts_to_ms_channel);
	OSMO_ASSERT(rc == -1);
	OSMO_ASSERT(test_state.ms_read == 2);

	/* clean up */
	lapdm_channel_exit(&bts_to_ms_channel);
	lapdm_channel_exit(&ms_to_bts_channel);
}

static void test_lapdm_early_release()
{
	printf("I test RF channel release of an unestablished channel.\n");

	int rc;
	struct lapdm_polling_state test_state;

	/* Configure LAPDm on both sides */
	struct lapdm_channel bts_to_ms_channel;
	memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));

	memset(&test_state, 0, sizeof(test_state));
	test_state.bts = &bts_to_ms_channel;

	/* BTS to MS in polling mode */
	lapdm_channel_init(&bts_to_ms_channel, LAPDM_MODE_BTS);
	lapdm_channel_set_flags(&bts_to_ms_channel, LAPDM_ENT_F_POLLING_ONLY);
	lapdm_channel_set_l1(&bts_to_ms_channel, NULL, &test_state);
	lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_tx_cb, &test_state);

	/* Send the release request */
	rc = lapdm_rslms_recvmsg(create_rel_req(), &bts_to_ms_channel);
	OSMO_ASSERT(rc == -EINVAL);

	/* clean up */
	lapdm_channel_exit(&bts_to_ms_channel);
}

static void test_lapdm_contention_resolution()
{
	printf("I test contention resultion by having two mobiles collide and "
		"first mobile repeating SABM.\n");

	int rc;
	struct lapdm_polling_state test_state;
	struct osmo_phsap_prim pp;

	/* Configure LAPDm on both sides */
	struct lapdm_channel bts_to_ms_channel;
	memset(&bts_to_ms_channel, 0, sizeof(bts_to_ms_channel));

	memset(&test_state, 0, sizeof(test_state));
	test_state.bts = &bts_to_ms_channel;

	/* BTS to MS in polling mode */
	lapdm_channel_init(&bts_to_ms_channel, LAPDM_MODE_BTS);
	lapdm_channel_set_flags(&bts_to_ms_channel, LAPDM_ENT_F_POLLING_ONLY);
	lapdm_channel_set_l1(&bts_to_ms_channel, NULL, &test_state);
	lapdm_channel_set_l3(&bts_to_ms_channel, bts_to_ms_tx_cb, &test_state);

	/* Send SABM MS 1, we must get UA */
	send_sabm(&bts_to_ms_channel, 0);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	CHECK_RC(rc);
	OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);

	/* Send SABM MS 2, we must get nothing, due to collision */
	send_sabm(&bts_to_ms_channel, 1);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	OSMO_ASSERT(rc == -ENODEV);

	/* Send SABM MS 1 again, we must get UA gain */
	send_sabm(&bts_to_ms_channel, 0);
	rc = lapdm_phsap_dequeue_prim(&bts_to_ms_channel.lapdm_dcch, &pp);
	CHECK_RC(rc);
	OSMO_ASSERT(memcmp(pp.oph.msg->l2h, ua, ARRAY_SIZE(ua)) == 0);

	/* clean up */
	lapdm_channel_exit(&bts_to_ms_channel);
}

int main(int argc, char **argv)
{
	osmo_init_logging(&info);

	test_lapdm_polling();
	test_lapdm_early_release();
	test_lapdm_contention_resolution();
	printf("Success.\n");

	return 0;
}