aboutsummaryrefslogtreecommitdiffstats
path: root/openbsc/src/input/misdn.c
blob: de8d41f21b0f77c198a9748e4be158d928e9624c (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
/* OpenBSC Abis input driver for mISDNuser */

/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
 * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
 *
 * 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 <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <mISDNif.h>

//#define AF_COMPATIBILITY_FUNC
//#include <compat_af_isdn.h>
#define AF_ISDN 34
#define PF_ISDN AF_ISDN

#include <openbsc/select.h>
#include <openbsc/msgb.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/abis_nm.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/subchan_demux.h>
#include <openbsc/e1_input.h>

/* data structure for one E1 interface with A-bis */
struct mi_e1_handle {
	/* The mISDN card number of the card we use */
	int cardnr;
};

#define TS1_ALLOC_SIZE	300

struct prim_name {
	unsigned int prim;
	const char *name;
};

const struct prim_name prim_names[] = {
	{ PH_CONTROL_IND, "PH_CONTROL_IND" },
	{ PH_DATA_IND, "PH_DATA_IND" },
	{ PH_DATA_CNF, "PH_DATA_CNF" },
	{ PH_ACTIVATE_IND, "PH_ACTIVATE_IND" },
	{ DL_ESTABLISH_IND, "DL_ESTABLISH_IND" },
	{ DL_ESTABLISH_CNF, "DL_ESTABLISH_CNF" },
	{ DL_RELEASE_IND, "DL_RELEASE_IND" },
	{ DL_RELEASE_CNF, "DL_RELEASE_CNF" },
	{ DL_DATA_IND, "DL_DATA_IND" },
	{ DL_UNITDATA_IND, "DL_UNITDATA_IND" },
	{ DL_INFORMATION_IND, "DL_INFORMATION_IND" },
	{ MPH_ACTIVATE_IND, "MPH_ACTIVATE_IND" },
	{ MPH_DEACTIVATE_IND, "MPH_DEACTIVATE_IND" },
};

const char *get_prim_name(unsigned int prim)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(prim_names); i++) {
		if (prim_names[i].prim == prim)
			return prim_names[i].name;
	}

	return "UNKNOWN";
}

static int handle_ts1_read(struct bsc_fd *bfd)
{
	struct e1inp_line *line = bfd->data;
	unsigned int ts_nr = bfd->priv_nr;
	struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
	struct e1inp_sign_link *link;
	struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
	struct sockaddr_mISDN l2addr;
	struct mISDNhead *hh;
	socklen_t alen;
	int ret;

	if (!msg)
		return -ENOMEM;

	hh = (struct mISDNhead *) msg->data;

	alen = sizeof(l2addr);
	ret = recvfrom(bfd->fd, msg->data, 300, 0,
		       (struct sockaddr *) &l2addr, &alen);
	if (ret < 0) {
		fprintf(stderr, "recvfrom error  %s\n", strerror(errno));
		return ret;
	}

	if (alen != sizeof(l2addr)) {
		fprintf(stderr, "%s error len\n", __func__);
		return -EINVAL;
	}

	msgb_put(msg, ret);

	DEBUGP(DMI, "alen =%d, dev(%d) channel(%d) sapi(%d) tei(%d)\n",
		alen, l2addr.dev, l2addr.channel, l2addr.sapi, l2addr.tei);

	DEBUGP(DMI, "<= len = %d, prim(0x%x) id(0x%x): %s\n",
		ret, hh->prim, hh->id, get_prim_name(hh->prim));

	switch (hh->prim) {
	case DL_INFORMATION_IND:
		/* mISDN tells us which channel number is allocated for this
		 * tuple of (SAPI, TEI). */
		DEBUGP(DMI, "DL_INFORMATION_IND: use channel(%d) sapi(%d) tei(%d) for now\n",
			l2addr.channel, l2addr.sapi, l2addr.tei);
		link = e1inp_lookup_sign_link(e1i_ts, l2addr.tei, l2addr.sapi);
		if (!link) {
			DEBUGPC(DMI, "mISDN message for unknown sign_link\n");
			free(msg);
			return -EINVAL;
		}
		/* save the channel number in the driver private struct */
		link->driver.misdn.channel = l2addr.channel;
		break;
	case DL_ESTABLISH_IND:
		DEBUGP(DMI, "DL_ESTABLISH_IND: channel(%d) sapi(%d) tei(%d)\n",
		l2addr.channel, l2addr.sapi, l2addr.tei);
		ret = e1inp_event(e1i_ts, EVT_E1_TEI_UP, l2addr.tei, l2addr.sapi);
		break;
	case DL_RELEASE_IND:
		DEBUGP(DMI, "DL_RELEASE_IND: channel(%d) sapi(%d) tei(%d)\n",
		l2addr.channel, l2addr.sapi, l2addr.tei);
		ret = e1inp_event(e1i_ts, EVT_E1_TEI_DN, l2addr.tei, l2addr.sapi);
		break;
	case DL_DATA_IND:
		msg->l2h = msg->data + MISDN_HEADER_LEN;
		DEBUGP(DMI, "RX: %s\n", hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN));
		ret = e1inp_rx_ts(e1i_ts, msg, l2addr.tei, l2addr.sapi);
		break;
	case PH_ACTIVATE_IND:
		DEBUGP(DMI, "PH_ACTIVATE_IND: channel(%d) sapi(%d) tei(%d)\n",
		l2addr.channel, l2addr.sapi, l2addr.tei);
		break;
	case PH_DEACTIVATE_IND:
		DEBUGP(DMI, "PH_DEACTIVATE_IND: channel(%d) sapi(%d) tei(%d)\n",
		l2addr.channel, l2addr.sapi, l2addr.tei);
		break;
	default:
		break;
	}
	return ret;
}

static int ts_want_write(struct e1inp_ts *e1i_ts)
{
	/* We never include the mISDN B-Channel FD into the
	 * writeset, since it doesn't support poll() based
	 * write flow control */		
	if (e1i_ts->type == E1INP_TS_TYPE_TRAU)
		return 0;

	e1i_ts->driver.misdn.fd.when |= BSC_FD_WRITE;

	return 0;
}

static void timeout_ts1_write(void *data)
{
	struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data;

	/* trigger write of ts1, due to tx delay timer */
	ts_want_write(e1i_ts);
}

static int handle_ts1_write(struct bsc_fd *bfd)
{
	struct e1inp_line *line = bfd->data;
	unsigned int ts_nr = bfd->priv_nr;
	struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
	struct e1inp_sign_link *sign_link;
	struct sockaddr_mISDN sa;
	struct msgb *msg;
	struct mISDNhead *hh;
	u_int8_t *l2_data;
	int ret;

	bfd->when &= ~BSC_FD_WRITE;

	/* get the next msg for this timeslot */
	msg = e1inp_tx_ts(e1i_ts, &sign_link);
	if (!msg) {
		/* no message after tx delay timer */
		return 0;
	}

	l2_data = msg->data;

	/* prepend the mISDNhead */
	hh = (struct mISDNhead *) msgb_push(msg, sizeof(*hh));
	hh->prim = DL_DATA_REQ;

	DEBUGP(DMI, "TX TEI(%d) SAPI(%d): %s\n", sign_link->tei,
		sign_link->sapi, hexdump(l2_data, msg->len - MISDN_HEADER_LEN));

	/* construct the sockaddr */
	sa.family = AF_ISDN;
	sa.sapi = sign_link->sapi;
	sa.dev = sign_link->tei;
	sa.channel = sign_link->driver.misdn.channel;

	ret = sendto(bfd->fd, msg->data, msg->len, 0,
		     (struct sockaddr *)&sa, sizeof(sa));
	if (ret < 0)
		fprintf(stderr, "%s sendto failed %d\n", __func__, ret);
	msgb_free(msg);

	/* set tx delay timer for next event */
	e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
	e1i_ts->sign.tx_timer.data = e1i_ts;
	bsc_schedule_timer(&e1i_ts->sign.tx_timer, 0, 50000);

	return ret;
}

#define BCHAN_TX_GRAN	160
/* write to a B channel TS */
static int handle_tsX_write(struct bsc_fd *bfd)
{
	struct e1inp_line *line = bfd->data;
	unsigned int ts_nr = bfd->priv_nr;
	struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
	struct mISDNhead *hh;
	u_int8_t tx_buf[BCHAN_TX_GRAN + sizeof(*hh)];
	struct subch_mux *mx = &e1i_ts->trau.mux;
	int ret;

	hh = (struct mISDNhead *) tx_buf;
	hh->prim = PH_DATA_REQ;

	subchan_mux_out(mx, tx_buf+sizeof(*hh), BCHAN_TX_GRAN);

	DEBUGP(DMIB, "BCHAN TX: %s\n",
		hexdump(tx_buf+sizeof(*hh), BCHAN_TX_GRAN));

	ret = send(bfd->fd, tx_buf, sizeof(*hh) + BCHAN_TX_GRAN, 0);
	if (ret < sizeof(*hh) + BCHAN_TX_GRAN)
		DEBUGP(DMIB, "send returns %d instead of %u\n", ret,
			sizeof(*hh) + BCHAN_TX_GRAN);

	return ret;
}

#define TSX_ALLOC_SIZE 4096
/* FIXME: read from a B channel TS */
static int handle_tsX_read(struct bsc_fd *bfd)
{
	struct e1inp_line *line = bfd->data;
	unsigned int ts_nr = bfd->priv_nr;
	struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
	struct msgb *msg = msgb_alloc(TSX_ALLOC_SIZE);
	struct mISDNhead *hh;
	int ret;

	if (!msg)
		return -ENOMEM;

	hh = (struct mISDNhead *) msg->data;

	ret = recv(bfd->fd, msg->data, TSX_ALLOC_SIZE, 0);
	if (ret < 0) {
		fprintf(stderr, "recvfrom error  %s\n", strerror(errno));
		return ret;
	}

	msgb_put(msg, ret);

	if (hh->prim != PH_CONTROL_IND)
		DEBUGP(DMIB, "<= BCHAN len = %d, prim(0x%x) id(0x%x): %s\n",
			ret, hh->prim, hh->id, get_prim_name(hh->prim));

	switch (hh->prim) {
	case PH_DATA_IND:
		msg->l2h = msg->data + MISDN_HEADER_LEN;
		DEBUGP(DMIB, "BCHAN RX: %s\n",
			hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN));
		ret = e1inp_rx_ts(e1i_ts, msg, 0, 0);
		break;
	case PH_ACTIVATE_IND:
	case PH_DATA_CNF:
		/* physical layer indicates that data has been sent,
		 * we thus can send some more data */
		ret = handle_tsX_write(bfd);
	default:
		break;
	}
	/* FIXME: why do we free signalling msgs in the caller, and trau not? */
	msgb_free(msg);

	return ret;
}

/* callback from select.c in case one of the fd's can be read/written */
static int misdn_fd_cb(struct bsc_fd *bfd, unsigned int what)
{
	struct e1inp_line *line = bfd->data;
	unsigned int ts_nr = bfd->priv_nr;
	unsigned int idx = ts_nr-1;
	struct e1inp_ts *e1i_ts = &line->ts[idx];
	int rc = 0;

	switch (e1i_ts->type) {
	case E1INP_TS_TYPE_SIGN:
		if (what & BSC_FD_READ)
			rc = handle_ts1_read(bfd);
		if (what & BSC_FD_WRITE)
			rc = handle_ts1_write(bfd);
		break;
	case E1INP_TS_TYPE_TRAU:
		if (what & BSC_FD_READ)
			rc = handle_tsX_read(bfd);
		/* We never include the mISDN B-Channel FD into the
		 * writeset, since it doesn't support poll() based
		 * write flow control */		
		break;
	default:
		fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
		break;
	}

	return rc;
}

static int activate_bchan(struct e1inp_line *line, int ts, int act)
{
	struct mISDNhead hh;
	int ret;
	unsigned int idx = ts-1;
	struct e1inp_ts *e1i_ts = &line->ts[idx];
	struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;

	fprintf(stdout, "activate bchan\n");
	if (act)
		hh.prim = PH_ACTIVATE_REQ;
	else
		hh.prim = PH_DEACTIVATE_REQ;

	hh.id = MISDN_ID_ANY;
	ret = sendto(bfd->fd, &hh, sizeof(hh), 0, NULL, 0);
	if (ret < 0) {
		fprintf(stdout, "could not send ACTIVATE_RQ %s\n",
			strerror(errno));
	}

	return ret;
}

struct e1inp_driver misdn_driver = {
	.name = "mISDNuser",
	.want_write = ts_want_write,
};

static int mi_e1_setup(struct e1inp_line *line, int release_l2)
{
	struct mi_e1_handle *e1h = line->driver_data;
	int ts, ret;

	/* TS0 is CRC4, don't need any fd for it */
	for (ts = 1; ts < NUM_E1_TS; ts++) {
		unsigned int idx = ts-1;
		struct e1inp_ts *e1i_ts = &line->ts[idx];
		struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
		struct sockaddr_mISDN addr;

		bfd->data = line;
		bfd->priv_nr = ts;
		bfd->cb = misdn_fd_cb;

		switch (e1i_ts->type) {
		case E1INP_TS_TYPE_NONE:
			continue;
			break;
		case E1INP_TS_TYPE_SIGN:
			bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_LAPD_NT);
			bfd->when = BSC_FD_READ;
			break;
		case E1INP_TS_TYPE_TRAU:
			bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
			/* We never include the mISDN B-Channel FD into the
	 		* writeset, since it doesn't support poll() based
	 		* write flow control */		
			bfd->when = BSC_FD_READ;
			break;
		}

		if (bfd->fd < 0) {
			fprintf(stderr, "%s could not open socket %s\n",
				__func__, strerror(errno));
			return bfd->fd;
		}

		memset(&addr, 0, sizeof(addr));
		addr.family = AF_ISDN;
		addr.dev = e1h->cardnr;
		switch (e1i_ts->type) {
		case E1INP_TS_TYPE_SIGN:
			addr.channel = 0;
			/* SAPI not supported yet in kernel */
			//addr.sapi = e1inp_ts->sign.sapi;
			addr.sapi = 0;
			addr.tei = GROUP_TEI;
			break;
		case E1INP_TS_TYPE_TRAU:
			addr.channel = ts;
			break;
		default:
			DEBUGP(DMI, "unsupported E1 TS type: %u\n",
				e1i_ts->type);
			break;
		}

		ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
		if (ret < 0) {
			fprintf(stderr, "could not bind l2 socket %s\n",
				strerror(errno));
			return -EIO;
		}

		if (e1i_ts->type == E1INP_TS_TYPE_SIGN) {
			ret = ioctl(bfd->fd, IMCLEAR_L2, &release_l2);
			if (ret < 0) {
				fprintf(stderr, "could not send IOCTL IMCLEAN_L2 %s\n", strerror(errno));
				return -EIO;
			}
		}

		/* FIXME: only activate B-Channels once we start to
		 * use them to conserve CPU power */
		if (e1i_ts->type == E1INP_TS_TYPE_TRAU)
			activate_bchan(line, ts, 1);

		ret = bsc_register_fd(bfd);
		if (ret < 0) {
			fprintf(stderr, "could not register FD: %s\n",
				strerror(ret));
			return ret;
		}
	}

	return 0;
}

int mi_setup(int cardnr,  struct e1inp_line *line, int release_l2)
{
	struct mi_e1_handle *e1h;
	int sk, ret, cnt;
	struct mISDN_devinfo devinfo;

	/* register the driver with the core */
	/* FIXME: do this in the plugin initializer function */
	ret = e1inp_driver_register(&misdn_driver);
	if (ret)
		return ret;

	/* create the actual line instance */
	/* FIXME: do this independent of driver registration */
	e1h = malloc(sizeof(*e1h));
	memset(e1h, 0, sizeof(*e1h));

	e1h->cardnr = cardnr;

	line->driver = &misdn_driver;
	line->driver_data = e1h;

	/* open the ISDN card device */
	sk = socket(PF_ISDN, SOCK_RAW, ISDN_P_BASE);
	if (sk < 0) {
		fprintf(stderr, "%s could not open socket %s\n",
			__func__, strerror(errno));
		return sk;
	}

	ret = ioctl(sk, IMGETCOUNT, &cnt);
	if (ret) {
		fprintf(stderr, "%s error getting interf count: %s\n",
			__func__, strerror(errno));
		close(sk);
		return -ENODEV;
	}
	//DEBUGP(DMI,"%d device%s found\n", cnt, (cnt==1)?"":"s");
	printf("%d device%s found\n", cnt, (cnt==1)?"":"s");
#if 1
	devinfo.id = e1h->cardnr;
	ret = ioctl(sk, IMGETDEVINFO, &devinfo);
	if (ret < 0) {
		fprintf(stdout, "error getting info for device %d: %s\n",
			e1h->cardnr, strerror(errno));
		return -ENODEV;
	}
	fprintf(stdout, "        id:             %d\n", devinfo.id);
	fprintf(stdout, "        Dprotocols:     %08x\n", devinfo.Dprotocols);
	fprintf(stdout, "        Bprotocols:     %08x\n", devinfo.Bprotocols);
	fprintf(stdout, "        protocol:       %d\n", devinfo.protocol);
	fprintf(stdout, "        nrbchan:        %d\n", devinfo.nrbchan);
	fprintf(stdout, "        name:           %s\n", devinfo.name);
#endif

	if (!(devinfo.Dprotocols & (1 << ISDN_P_NT_E1))) {
		fprintf(stderr, "error: card is not of type E1 (NT-mode)\n");
		return -EINVAL;
	}

	if (devinfo.nrbchan != 30) {
		fprintf(stderr, "error: E1 card has no 30 B-channels\n");
		return -EINVAL;
	}

	ret = mi_e1_setup(line, release_l2);
	if (ret)
		return ret;

	return e1inp_line_register(line);
}