summaryrefslogtreecommitdiffstats
path: root/openbsc/src/libbsc/bts_ipaccess_nanobts.c
blob: 42ac6b4a5c97fda9c7ebb234f8f509fe6353cb4d (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
/* ip.access nanoBTS specific code */

/* (C) 2009-2010 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 <arpa/inet.h>

#include <osmocom/gsm/tlv.h>

#include <openbsc/gsm_data.h>
#include <openbsc/signal.h>
#include <openbsc/abis_nm.h>
#include <osmocom/abis/e1_input.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <openbsc/gsm_data.h>
#include <openbsc/abis_nm.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/debug.h>
#include <osmocom/abis/subchan_demux.h>
#include <osmocom/abis/ipaccess.h>
#include <osmocom/core/logging.h>

static int bts_model_nanobts_start(struct gsm_network *net);
static void bts_model_nanobts_e1line_bind_ops(struct e1inp_line *line);

static struct gsm_bts_model model_nanobts = {
	.type = GSM_BTS_TYPE_NANOBTS,
	.name = "nanobts",
	.start = bts_model_nanobts_start,
	.oml_rcvmsg = &abis_nm_rcvmsg,
	.e1line_bind_ops = bts_model_nanobts_e1line_bind_ops, 
	.nm_att_tlvdef = {
		.def = {
			/* ip.access specifics */
			[NM_ATT_IPACC_DST_IP] =		{ TLV_TYPE_FIXED, 4 },
			[NM_ATT_IPACC_DST_IP_PORT] =	{ TLV_TYPE_FIXED, 2 },
			[NM_ATT_IPACC_STREAM_ID] =	{ TLV_TYPE_TV, },
			[NM_ATT_IPACC_SEC_OML_CFG] =	{ TLV_TYPE_FIXED, 6 },
			[NM_ATT_IPACC_IP_IF_CFG] =	{ TLV_TYPE_FIXED, 8 },
			[NM_ATT_IPACC_IP_GW_CFG] =	{ TLV_TYPE_FIXED, 12 },
			[NM_ATT_IPACC_IN_SERV_TIME] =	{ TLV_TYPE_FIXED, 4 },
			[NM_ATT_IPACC_LOCATION] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_PAGING_CFG] =	{ TLV_TYPE_FIXED, 2 },
			[NM_ATT_IPACC_UNIT_ID] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_UNIT_NAME] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_SNMP_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_PRIM_OML_CFG_LIST] = { TLV_TYPE_TL16V },
			[NM_ATT_IPACC_NV_FLAGS] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_FREQ_CTRL] =	{ TLV_TYPE_FIXED, 2 },
			[NM_ATT_IPACC_PRIM_OML_FB_TOUT] = { TLV_TYPE_TL16V },
			[NM_ATT_IPACC_CUR_SW_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_TIMING_BUS] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_CGI] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_RAC] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_OBJ_VERSION] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_GPRS_PAGING_CFG]= { TLV_TYPE_TL16V },
			[NM_ATT_IPACC_NSEI] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_BVCI] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_NSVCI] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_NS_CFG] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_BSSGP_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_NS_LINK_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_RLC_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_ALM_THRESH_LIST]=	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_MONIT_VAL_LIST] = { TLV_TYPE_TL16V },
			[NM_ATT_IPACC_TIB_CONTROL] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_SUPP_FEATURES] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_CODING_SCHEMES] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_RLC_CFG_2] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_HEARTB_TOUT] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_UPTIME] =		{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_RLC_CFG_3] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_SSL_CFG] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_SEC_POSSIBLE] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_IML_SSL_STATE] =	{ TLV_TYPE_TL16V },
			[NM_ATT_IPACC_REVOC_DATE] =	{ TLV_TYPE_TL16V },
		},
	},
};

static unsigned char nanobts_attr_bts[] = {
	NM_ATT_INTERF_BOUND, 0x55, 0x5b, 0x61, 0x67, 0x6d, 0x73,
	/* interference avg. period in numbers of SACCH multifr */
	NM_ATT_INTAVE_PARAM, 0x06,
	/* conn fail based on SACCH error rate */
	NM_ATT_CONN_FAIL_CRIT, 0x00, 0x02, 0x01, 0x10,
	NM_ATT_T200, 0x1e, 0x24, 0x24, 0xa8, 0x34, 0x21, 0xa8,
	NM_ATT_MAX_TA, 0x3f,
	NM_ATT_OVERL_PERIOD, 0x00, 0x01, 10, /* seconds */
	NM_ATT_CCCH_L_T, 10, /* percent */
	NM_ATT_CCCH_L_I_P, 1, /* seconds */
	NM_ATT_RACH_B_THRESH, 10, /* busy threshold in - dBm */
	NM_ATT_LDAVG_SLOTS, 0x03, 0xe8, /* rach load averaging 1000 slots */
	NM_ATT_BTS_AIR_TIMER, 128, /* miliseconds */
	NM_ATT_NY1, 10, /* 10 retransmissions of physical config */
	NM_ATT_BCCH_ARFCN, HARDCODED_ARFCN >> 8, HARDCODED_ARFCN & 0xff,
	NM_ATT_BSIC, HARDCODED_BSIC,
	NM_ATT_IPACC_CGI, 0, 7,  0x00, 0xf1, 0x10, 0x00, 0x01, 0x00, 0x00,
};

static unsigned char nanobts_attr_radio[] = {
	NM_ATT_RF_MAXPOWR_R, 0x0c, /* number of -2dB reduction steps / Pn */
	NM_ATT_ARFCN_LIST, 0x00, 0x02, HARDCODED_ARFCN >> 8, HARDCODED_ARFCN & 0xff,
};

static unsigned char nanobts_attr_nse[] = {
	NM_ATT_IPACC_NSEI, 0, 2,  0x03, 0x9d, /* NSEI 925 */
	NM_ATT_IPACC_NS_CFG, 0, 7,  3,  /* (un)blocking timer (Tns-block) */
				    3,  /* (un)blocking retries */
				    3,  /* reset timer (Tns-reset) */
				    3,  /* reset retries */
				    30,  /* test timer (Tns-test) */
				    3,  /* alive timer (Tns-alive) */
				    10, /* alive retrires */
	NM_ATT_IPACC_BSSGP_CFG, 0, 11,
				    3,  /* blockimg timer (T1) */
				    3,  /* blocking retries */
				    3,  /* unblocking retries */
				    3,  /* reset timer */
				    3,  /* reset retries */
				    10, /* suspend timer (T3) in 100ms */
				    3,  /* suspend retries */
				    10, /* resume timer (T4) in 100ms */
				    3,  /* resume retries */
				    10, /* capability update timer (T5) */
				    3,  /* capability update retries */
};

static unsigned char nanobts_attr_cell[] = {
	NM_ATT_IPACC_RAC, 0, 1,  1, /* routing area code */
	NM_ATT_IPACC_GPRS_PAGING_CFG, 0, 2,
		5,	/* repeat time (50ms) */
		3,	/* repeat count */
	NM_ATT_IPACC_BVCI, 0, 2,  0x03, 0x9d, /* BVCI 925 */
	NM_ATT_IPACC_RLC_CFG, 0, 9,
		20, 	/* T3142 */
		5, 	/* T3169 */
		5,	/* T3191 */
		200,	/* T3193 */
		5,	/* T3195 */
		10,	/* N3101 */
		4,	/* N3103 */
		8,	/* N3105 */
		15,	/* RLC CV countdown */
	NM_ATT_IPACC_CODING_SCHEMES, 0, 2,  0x0f, 0x00,	/* CS1..CS4 */
	NM_ATT_IPACC_RLC_CFG_2, 0, 5,
		0x00, 250,	/* T downlink TBF extension (0..500) */
		0x00, 250,	/* T uplink TBF extension (0..500) */
		2,	/* CS2 */
#if 0
	/* EDGE model only, breaks older models.
	 * Should inquire the BTS capabilities */
	NM_ATT_IPACC_RLC_CFG_3, 0, 1,
		2,	/* MCS2 */
#endif
};

static unsigned char nanobts_attr_nsvc0[] = {
	NM_ATT_IPACC_NSVCI, 0, 2,  0x03, 0x9d, /* 925 */
	NM_ATT_IPACC_NS_LINK_CFG, 0, 8,
		0x59, 0xd8, /* remote udp port (23000) */
		192, 168, 100, 11, /* remote ip address */
		0x59, 0xd8, /* local udp port (23000) */
};

static void patch_16(uint8_t *data, const uint16_t val)
{
	memcpy(data, &val, sizeof(val));
}

static void patch_32(uint8_t *data, const uint32_t val)
{
	memcpy(data, &val, sizeof(val));
}

/*
 * Patch the various SYSTEM INFORMATION tables to update
 * the LAI
 */
static void patch_nm_tables(struct gsm_bts *bts)
{
	uint8_t arfcn_low = bts->c0->arfcn & 0xff;
	uint8_t arfcn_high = (bts->c0->arfcn >> 8) & 0x0f;

	/* patch ARFCN into BTS Attributes */
	nanobts_attr_bts[42] &= 0xf0;
	nanobts_attr_bts[42] |= arfcn_high;
	nanobts_attr_bts[43] = arfcn_low;

	/* patch the RACH attributes */
	if (bts->rach_b_thresh != -1) {
		nanobts_attr_bts[33] = bts->rach_b_thresh & 0xff;
	}

	if (bts->rach_ldavg_slots != -1) {
		uint8_t avg_high = bts->rach_ldavg_slots & 0xff;
		uint8_t avg_low = (bts->rach_ldavg_slots >> 8) & 0x0f;

		nanobts_attr_bts[35] = avg_high;
		nanobts_attr_bts[36] = avg_low;
	}

	/* patch BSIC */
	nanobts_attr_bts[sizeof(nanobts_attr_bts)-11] = bts->bsic;

	/* patch CGI */
	abis_nm_ipaccess_cgi(nanobts_attr_bts+sizeof(nanobts_attr_bts)-7, bts);

	/* patch the power reduction */
	nanobts_attr_radio[1] = bts->c0->max_power_red / 2;

	/* patch NSEI */
	nanobts_attr_nse[3] = bts->gprs.nse.nsei >> 8;
	nanobts_attr_nse[4] = bts->gprs.nse.nsei & 0xff;
	memcpy(nanobts_attr_nse+8, bts->gprs.nse.timer,
		ARRAY_SIZE(bts->gprs.nse.timer));
	memcpy(nanobts_attr_nse+18, bts->gprs.cell.timer,
		ARRAY_SIZE(bts->gprs.cell.timer));

	/* patch NSVCI */
	nanobts_attr_nsvc0[3] = bts->gprs.nsvc[0].nsvci >> 8;
	nanobts_attr_nsvc0[4] = bts->gprs.nsvc[0].nsvci & 0xff;

	/* patch IP address as SGSN IP */
	patch_16(nanobts_attr_nsvc0 + 8, 
			htons(bts->gprs.nsvc[0].remote_port));
	patch_32(nanobts_attr_nsvc0 + 10,
			htonl(bts->gprs.nsvc[0].remote_ip));
	patch_16(nanobts_attr_nsvc0 + 14,
			htons(bts->gprs.nsvc[0].local_port));

	/* patch BVCI */
	nanobts_attr_cell[12] = bts->gprs.cell.bvci >> 8;
	nanobts_attr_cell[13] = bts->gprs.cell.bvci & 0xff;
	/* patch RAC */
	nanobts_attr_cell[3] = bts->gprs.rac;

	if (bts->gprs.mode == BTS_GPRS_EGPRS) {
		/* patch EGPRS coding schemes MCS 1..9 */
		nanobts_attr_cell[29] = 0x8f;
		nanobts_attr_cell[30] = 0xff;
	}
}


/* Callback function to be called whenever we get a GSM 12.21 state change event */
static int nm_statechg_event(int evt, struct nm_statechg_signal_data *nsd)
{
	uint8_t obj_class = nsd->obj_class;
	void *obj = nsd->obj;
	struct gsm_nm_state *new_state = nsd->new_state;

	struct gsm_bts *bts;
	struct gsm_bts_trx *trx;
	struct gsm_bts_trx_ts *ts;
	struct gsm_bts_gprs_nsvc *nsvc;

	if (nsd->bts->type != GSM_BTS_TYPE_NANOBTS)
		return 0;

	/* This event-driven BTS setup is currently only required on nanoBTS */

	/* S_NM_STATECHG_ADM is called after we call chg_adm_state() and would create
	 * endless loop */
	if (evt != S_NM_STATECHG_OPER)
		return 0;

	switch (obj_class) {
	case NM_OC_SITE_MANAGER:
		bts = container_of(obj, struct gsm_bts, site_mgr);
		if ((new_state->operational == NM_OPSTATE_ENABLED &&
		     new_state->availability == NM_AVSTATE_OK) ||
		    (new_state->operational == NM_OPSTATE_DISABLED &&
		     new_state->availability == NM_AVSTATE_OFF_LINE))
			abis_nm_opstart(bts, obj_class, 0xff, 0xff, 0xff);
		break;
	case NM_OC_BTS:
		bts = obj;
		if (new_state->availability == NM_AVSTATE_DEPENDENCY) {
			patch_nm_tables(bts);
			abis_nm_set_bts_attr(bts, nanobts_attr_bts,
					     sizeof(nanobts_attr_bts));
			abis_nm_chg_adm_state(bts, obj_class,
					      bts->bts_nr, 0xff, 0xff,
					      NM_STATE_UNLOCKED);
			abis_nm_opstart(bts, obj_class,
					bts->bts_nr, 0xff, 0xff);
		}
		break;
	case NM_OC_CHANNEL:
		ts = obj;
		trx = ts->trx;
		if (new_state->operational == NM_OPSTATE_DISABLED &&
		    new_state->availability == NM_AVSTATE_DEPENDENCY) {
			patch_nm_tables(trx->bts);
			enum abis_nm_chan_comb ccomb =
						abis_nm_chcomb4pchan(ts->pchan);
			abis_nm_set_channel_attr(ts, ccomb);
			abis_nm_chg_adm_state(trx->bts, obj_class,
					      trx->bts->bts_nr, trx->nr, ts->nr,
					      NM_STATE_UNLOCKED);
			abis_nm_opstart(trx->bts, obj_class,
					trx->bts->bts_nr, trx->nr, ts->nr);
		}
		break;
	case NM_OC_RADIO_CARRIER:
		trx = obj;
		if (new_state->operational == NM_OPSTATE_DISABLED &&
		    new_state->availability == NM_AVSTATE_OK)
			abis_nm_opstart(trx->bts, obj_class, trx->bts->bts_nr,
					trx->nr, 0xff);
		break;
	case NM_OC_GPRS_NSE:
		bts = container_of(obj, struct gsm_bts, gprs.nse);
		if (bts->gprs.mode == BTS_GPRS_NONE)
			break;
		if (new_state->availability == NM_AVSTATE_DEPENDENCY) {
			abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr,
						  0xff, 0xff, nanobts_attr_nse,
						  sizeof(nanobts_attr_nse));
			abis_nm_opstart(bts, obj_class, bts->bts_nr,
					0xff, 0xff);
		}
		break;
	case NM_OC_GPRS_CELL:
		bts = container_of(obj, struct gsm_bts, gprs.cell);
		if (bts->gprs.mode == BTS_GPRS_NONE)
			break;
		if (new_state->availability == NM_AVSTATE_DEPENDENCY) {
			abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr,
						  0, 0xff, nanobts_attr_cell,
						  sizeof(nanobts_attr_cell));
			abis_nm_opstart(bts, obj_class, bts->bts_nr,
					0, 0xff);
			abis_nm_chg_adm_state(bts, obj_class, bts->bts_nr,
					      0, 0xff, NM_STATE_UNLOCKED);
			abis_nm_chg_adm_state(bts, NM_OC_GPRS_NSE, bts->bts_nr,
					      0xff, 0xff, NM_STATE_UNLOCKED);
		}
		break;
	case NM_OC_GPRS_NSVC:
		nsvc = obj;
		bts = nsvc->bts;
		if (bts->gprs.mode == BTS_GPRS_NONE)
			break;
		/* We skip NSVC1 since we only use NSVC0 */
		if (nsvc->id == 1)
			break;
		if (new_state->availability == NM_AVSTATE_OFF_LINE) {
			abis_nm_ipaccess_set_attr(bts, obj_class, bts->bts_nr,
						  nsvc->id, 0xff,
						  nanobts_attr_nsvc0,
						  sizeof(nanobts_attr_nsvc0));
			abis_nm_opstart(bts, obj_class, bts->bts_nr,
					nsvc->id, 0xff);
			abis_nm_chg_adm_state(bts, obj_class, bts->bts_nr,
					      nsvc->id, 0xff,
					      NM_STATE_UNLOCKED);
		}
	default:
		break;
	}
	return 0;
}

/* Callback function to be called every time we receive a 12.21 SW activated report */
static int sw_activ_rep(struct msgb *mb)
{
	struct abis_om_fom_hdr *foh = msgb_l3(mb);
	struct e1inp_sign_link *sign_link = mb->dst;
	struct gsm_bts *bts = sign_link->trx->bts;
	struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, foh->obj_inst.trx_nr);

	if (!trx)
		return -EINVAL;

	if (trx->bts->type != GSM_BTS_TYPE_NANOBTS)
		return 0;

	switch (foh->obj_class) {
	case NM_OC_BASEB_TRANSC:
		abis_nm_chg_adm_state(trx->bts, foh->obj_class,
				      trx->bts->bts_nr, trx->nr, 0xff,
				      NM_STATE_UNLOCKED);
		abis_nm_opstart(trx->bts, foh->obj_class,
				trx->bts->bts_nr, trx->nr, 0xff);
		/* TRX software is active, tell it to initiate RSL Link */
		abis_nm_ipaccess_rsl_connect(trx, 0, 3003, trx->rsl_tei);
		break;
	case NM_OC_RADIO_CARRIER: {
		/*
		 * Locking the radio carrier will make it go
		 * offline again and we would come here. The
		 * framework should determine that there was
		 * no change and avoid recursion.
		 *
		 * This code is here to make sure that on start
		 * a TRX remains locked.
		 */
		int rc_state = trx->mo.nm_state.administrative;
		/* Patch ARFCN into radio attribute */
		nanobts_attr_radio[5] &= 0xf0;
		nanobts_attr_radio[5] |= trx->arfcn >> 8;
		nanobts_attr_radio[6] = trx->arfcn & 0xff;
		abis_nm_set_radio_attr(trx, nanobts_attr_radio,
				       sizeof(nanobts_attr_radio));
		abis_nm_chg_adm_state(trx->bts, foh->obj_class,
				      trx->bts->bts_nr, trx->nr, 0xff,
				      rc_state);
		abis_nm_opstart(trx->bts, foh->obj_class, trx->bts->bts_nr,
				trx->nr, 0xff);
		break;
		}
	}
	return 0;
}

/* Callback function to be called every time we receive a signal from NM */
static int nm_sig_cb(unsigned int subsys, unsigned int signal,
		     void *handler_data, void *signal_data)
{
	if (subsys != SS_NM)
		return 0;

	switch (signal) {
	case S_NM_SW_ACTIV_REP:
		return sw_activ_rep(signal_data);
	case S_NM_STATECHG_OPER:
	case S_NM_STATECHG_ADM:
		return nm_statechg_event(signal, signal_data);
	default:
		break;
	}
	return 0;
}

static struct gsm_network *ipaccess_gsmnet;

static int bts_model_nanobts_start(struct gsm_network *net)
{
	model_nanobts.features.data = &model_nanobts._features_data[0];
	model_nanobts.features.data_len = sizeof(model_nanobts._features_data);

	gsm_btsmodel_set_feature(&model_nanobts, BTS_FEAT_GPRS);
	gsm_btsmodel_set_feature(&model_nanobts, BTS_FEAT_EGPRS);

	osmo_signal_register_handler(SS_NM, nm_sig_cb, NULL);

	ipaccess_gsmnet = net;
	return 0;
}

int bts_model_nanobts_init(void)
{
	return gsm_bts_model_register(&model_nanobts);
}

#define OML_UP         0x0001
#define RSL_UP         0x0002

static struct gsm_bts *
find_bts_by_unitid(struct gsm_network *net, uint16_t site_id, uint16_t bts_id)
{
	struct gsm_bts *bts;

	llist_for_each_entry(bts, &net->bts_list, list) {
		if (!is_ipaccess_bts(bts))
			continue;

		if (bts->ip_access.site_id == site_id &&
		    bts->ip_access.bts_id == bts_id)
			return bts;
	}
	return NULL;
}

/* These are exported because they are used by the VTY interface. */
void ipaccess_drop_rsl(struct gsm_bts_trx *trx)
{
	if (!trx->rsl_link)
		return;

	e1inp_sign_link_destroy(trx->rsl_link);
	trx->rsl_link = NULL;
}

void ipaccess_drop_oml(struct gsm_bts *bts)
{
	struct gsm_bts_trx *trx;
	struct e1inp_line *line;

	if (!bts->oml_link)
		return;

	line = bts->oml_link->ts->line;

	e1inp_sign_link_destroy(bts->oml_link);
	bts->oml_link = NULL;

	/* we have issues reconnecting RSL, drop everything. */
	llist_for_each_entry(trx, &bts->trx_list, list)
		ipaccess_drop_rsl(trx);

	bts->ip_access.flags = 0;
}

/* This function is called once the OML/RSL link becomes up. */
static struct e1inp_sign_link *
ipaccess_sign_link_up(void *unit_data, struct e1inp_line *line,
		      enum e1inp_sign_type type)
{
	struct gsm_bts *bts;
	struct ipaccess_unit *dev = unit_data;
	struct e1inp_sign_link *sign_link = NULL;

	bts = find_bts_by_unitid(ipaccess_gsmnet, dev->site_id, dev->bts_id);
	if (!bts) {
		LOGP(DLINP, LOGL_ERROR, "Unable to find BTS configuration for "
			" %u/%u/%u, disconnecting\n", dev->site_id,
			dev->bts_id, dev->trx_id);
		return NULL;
	}
	DEBUGP(DLINP, "Identified BTS %u/%u/%u\n",
			dev->site_id, dev->bts_id, dev->trx_id);

	switch(type) {
	case E1INP_SIGN_OML:
		/* remove old OML signal link for this BTS. */
		ipaccess_drop_oml(bts);

		/* create new OML link. */
		sign_link = bts->oml_link =
			e1inp_sign_link_create(&line->ts[E1INP_SIGN_OML - 1],
						E1INP_SIGN_OML, bts->c0,
						bts->oml_tei, 0);
		break;
	case E1INP_SIGN_RSL: {
		struct e1inp_ts *ts;
		struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, dev->trx_id);

		/* no OML link set yet? give up. */
		if (!bts->oml_link)
			return NULL;

		/* remove old RSL link for this TRX. */
		ipaccess_drop_rsl(trx);

		/* set new RSL link for this TRX. */
		line = bts->oml_link->ts->line;
		ts = &line->ts[E1INP_SIGN_RSL + dev->trx_id - 1];
		e1inp_ts_config_sign(ts, line);
		sign_link = trx->rsl_link =
				e1inp_sign_link_create(ts, E1INP_SIGN_RSL,
						       trx, trx->rsl_tei, 0);
		trx->rsl_link->ts->sign.delay = 0;
		break;
	}
	default:
		break;
	}
	return sign_link;
}

static void ipaccess_sign_link_down(struct e1inp_line *line)
{
	/* No matter what link went down, we close both signal links. */
	struct e1inp_ts *ts = &line->ts[E1INP_SIGN_OML-1];
	struct e1inp_sign_link *link;

	llist_for_each_entry(link, &ts->sign.sign_links, list) {
		struct gsm_bts *bts = link->trx->bts;

		ipaccess_drop_oml(bts);
		/* Yes, we only use the first element of the list. */
		break;
	}
}

/* This function is called if we receive one OML/RSL message. */
static int ipaccess_sign_link(struct msgb *msg)
{
	int ret = 0;
	struct e1inp_sign_link *link = msg->dst;
	struct e1inp_ts *e1i_ts = link->ts;

	switch (link->type) {
	case E1INP_SIGN_RSL:
		if (!(link->trx->bts->ip_access.flags &
					(RSL_UP << link->trx->nr))) {
			e1inp_event(e1i_ts, S_L_INP_TEI_UP,
					link->tei, link->sapi);
			link->trx->bts->ip_access.flags |=
					(RSL_UP << link->trx->nr);
		}
	        ret = abis_rsl_rcvmsg(msg);
	        break;
	case E1INP_SIGN_OML:
		if (!(link->trx->bts->ip_access.flags & OML_UP)) {
			e1inp_event(e1i_ts, S_L_INP_TEI_UP,
					link->tei, link->sapi);
			link->trx->bts->ip_access.flags |= OML_UP;
		}
	        ret = abis_nm_rcvmsg(msg);
	        break;
	default:
		LOGP(DLINP, LOGL_ERROR, "Unknown signal link type %d\n",
			link->type);
		msgb_free(msg);
		break;
	}
	return ret;
}

/* not static, ipaccess-config needs it. */
struct e1inp_line_ops ipaccess_e1inp_line_ops = {
	.cfg = {
		.ipa = {
			.addr = "0.0.0.0",
			.role = E1INP_LINE_R_BSC,
		},
	},
	.sign_link_up	= ipaccess_sign_link_up,
	.sign_link_down	= ipaccess_sign_link_down,
	.sign_link	= ipaccess_sign_link,
};

static void bts_model_nanobts_e1line_bind_ops(struct e1inp_line *line)
{
        e1inp_line_bind_ops(line, &ipaccess_e1inp_line_ops);
}