aboutsummaryrefslogtreecommitdiffstats
path: root/src/hnbgw.c
blob: 798789c6d00efa59a2f2b2163adabed2a3d0454d (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
/* main application for hnb-gw part of osmo-iuh */

/* (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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <signal.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <arpa/inet.h>

#include <osmocom/core/application.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/write_queue.h>

#include <osmocom/vty/telnet_interface.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/command.h>

#include <osmocom/netif/stream.h>

#include <osmocom/sigtran/sua.h>
#include <osmocom/sigtran/protocol/sua.h>
#include <osmocom/sigtran/sccp_sap.h>

#include "hnbgw.h"
#include "hnbgw_hnbap.h"
#include "hnbgw_rua.h"
#include "hnbgw_cn.h"
#include "context_map.h"

static void *tall_hnb_ctx;
void *talloc_asn1_ctx;

static struct hnb_gw *g_hnb_gw;

static int listen_fd_cb(struct osmo_fd *fd, unsigned int what);

static struct hnb_gw *hnb_gw_create(void *ctx)
{
	struct hnb_gw *gw = talloc_zero(ctx, struct hnb_gw);

	gw->config.iuh_listen_port = IUH_DEFAULT_SCTP_PORT;

	gw->next_ue_ctx_id = 23;
	INIT_LLIST_HEAD(&gw->hnb_list);
	INIT_LLIST_HEAD(&gw->ue_list);
	INIT_LLIST_HEAD(&gw->cn_list);

	context_map_init(gw);

	return gw;
}

struct ue_context *ue_context_by_id(struct hnb_gw *gw, uint32_t id)
{
	struct ue_context *ue;

	llist_for_each_entry(ue, &gw->ue_list, list) {
		if (ue->context_id == id)
			return ue;
	}
	return NULL;

}

struct ue_context *ue_context_by_imsi(struct hnb_gw *gw, const char *imsi)
{
	struct ue_context *ue;

	llist_for_each_entry(ue, &gw->ue_list, list) {
		if (!strcmp(ue->imsi, imsi))
			return ue;
	}
	return NULL;
}

void ue_context_free_by_hnb(struct hnb_gw *gw, const struct hnb_context *hnb)
{
	struct ue_context *ue, *tmp;

	llist_for_each_entry_safe(ue, tmp, &gw->ue_list, list) {
		if (ue->hnb == hnb)
			ue_context_free(ue);
	}
}

static uint32_t get_next_ue_ctx_id(struct hnb_gw *gw)
{
	uint32_t id;

	do {
		id = gw->next_ue_ctx_id++;
	} while (ue_context_by_id(gw, id));

	return id;
}

struct ue_context *ue_context_alloc(struct hnb_context *hnb, const char *imsi)
{
	struct ue_context *ue;

	ue = talloc_zero(tall_hnb_ctx, struct ue_context);
	if (!ue)
		return NULL;

	ue->hnb = hnb;
	strncpy(ue->imsi, imsi, sizeof(ue->imsi));
	ue->context_id = get_next_ue_ctx_id(hnb->gw);
	llist_add_tail(&ue->list, &hnb->gw->ue_list);

	return ue;
}

void ue_context_free(struct ue_context *ue)
{
	llist_del(&ue->list);
	talloc_free(ue);
}
static int hnb_close_cb(struct osmo_stream_srv *conn)
{
}

static int hnb_read_cb(struct osmo_stream_srv *conn)
{
	struct hnb_context *hnb = osmo_stream_srv_get_data(conn);
	struct msgb *msg = msgb_alloc(IUH_MSGB_SIZE, "Iuh rx");
	int flags = 0;
	int rc;

	if (!msg)
		return -ENOMEM;

	/* we store a reference to the HomeNodeB in the msg->dest for the
	 * benefit of varoius downstream processing functions */
	msg->dst = hnb;

	rc = osmo_stream_srv_recv(conn, msg);
	if (rc == -EAGAIN) {
		/* Notification received */
		msgb_free(msg);
		return 0;
	} else if (rc < 0) {
		LOGP(DMAIN, LOGL_ERROR, "Error during sctp_recvmsg()\n");
		/* FIXME: clean up after disappeared HNB */
		hnb_context_release(hnb);
		goto out;
	} else if (rc == 0) {
		hnb_context_release(hnb);
		rc = -1;

		goto out;
	} else {
		msgb_put(msg, rc);
	}

	switch (msgb_sctp_ppid(msg)) {
	case IUH_PPI_HNBAP:
		hnb->hnbap_stream = msgb_sctp_stream(msg);
		rc = hnbgw_hnbap_rx(hnb, msg);
		break;
	case IUH_PPI_RUA:
		hnb->rua_stream = msgb_sctp_stream(msg);
		rc = hnbgw_rua_rx(hnb, msg);
		break;
	case IUH_PPI_SABP:
	case IUH_PPI_RNA:
	case IUH_PPI_PUA:
		LOGP(DMAIN, LOGL_ERROR, "Unimplemented SCTP PPID=%u received\n",
		     msgb_sctp_ppid(msg));
		rc = 0;
		break;
	default:
		LOGP(DMAIN, LOGL_ERROR, "Unknown SCTP PPID=%u received\n",
		     msgb_sctp_ppid(msg));
		rc = 0;
		break;
	}

out:
	msgb_free(msg);
	return rc;
}

static int hnb_write_cb(struct osmo_fd *fd, struct msgb *msg)
{
	struct hnb_context *ctx = fd->data;
	struct sctp_sndrcvinfo sinfo = {
		.sinfo_ppid = htonl(msgb_sctp_ppid(msg)),
		.sinfo_stream = ctx->hnbap_stream,
	};
	int rc;

	rc = sctp_send(fd->fd, msgb_data(msg), msgb_length(msg),
			&sinfo, 0);
	/* we don't need to msgb_free(), write_queue does this for us */
	return rc;
}

struct hnb_context *hnb_context_alloc(struct hnb_gw *gw, struct osmo_stream_srv_link *link, int new_fd)
{
	struct hnb_context *ctx;

	ctx = talloc_zero(tall_hnb_ctx, struct hnb_context);
	if (!ctx)
		return NULL;
	INIT_LLIST_HEAD(&ctx->map_list);

	ctx->gw = gw;
	ctx->conn = osmo_stream_srv_create(tall_hnb_ctx, link, new_fd, hnb_read_cb, hnb_close_cb, ctx);
	if (!ctx->conn) {
		LOGP(DMAIN, LOGL_INFO, "error while creating connection\n");
		talloc_free(ctx);
		return NULL;
	}

	llist_add_tail(&ctx->list, &gw->hnb_list);
	return ctx;
}

void hnb_context_release(struct hnb_context *ctx)
{
	struct hnbgw_context_map *map, *map2;

	/* remove from the list of HNB contexts */
	llist_del(&ctx->list);

	/* deactivate all context maps */
	llist_for_each_entry_safe(map, map2, &ctx->map_list, hnb_list) {
		/* remove it from list, as HNB context will soon be
		 * gone.  Let's hope the seccond osmo_llist_del in the
		 * map garbage collector wors fine? */
		llist_del(&map->hnb_list);
		context_map_deactivate(map);
	}
	ue_context_free_by_hnb(ctx->gw, ctx);
	osmo_stream_srv_destroy(ctx->conn);

	talloc_free(ctx);
}

/*! call-back when the listen FD has something to read */
static int accept_cb(struct osmo_stream_srv_link *srv, int fd)
{
	struct hnb_gw *gw = osmo_stream_srv_link_get_data(srv);
	struct hnb_context *ctx;

	ctx = hnb_context_alloc(gw, srv, fd);
	if (!ctx)
		return -ENOMEM;

	return 0;
}

/* Entry point for primitives coming up from SCCP User SAP */
static int sccp_sap_up(struct osmo_prim_hdr *oph, void *link)
{
	struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph;

	LOGP(DMAIN, LOGL_DEBUG, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph));

	/* FIXME: Do something */

	msgb_free(oph->msg);

	return 0;
}

static const struct log_info_cat log_cat[] = {
	[DMAIN] = {
		.name = "DMAIN", .loglevel = LOGL_INFO, .enabled = 1,
		.color = "",
		.description = "Main program",
	},
	[DHNBAP] = {
		.name = "DHNBAP", .loglevel = LOGL_DEBUG, .enabled = 1,
		.color = "",
		.description = "Home Node B Application Part",
	},
	[DSUA] = {
		.name = "DSUA", .loglevel = LOGL_DEBUG, .enabled = 1,
		.color = "",
		.description = "SCCP User Adaptation",
	},
	[DRUA] = {
		.name = "DRUA", .loglevel = LOGL_DEBUG, .enabled = 1,
		.color = "",
		.description = "RANAP User Adaptation",
	},
	[DRANAP] = {
		.name = "DRANAP", .loglevel = LOGL_DEBUG, .enabled = 1,
		.color = "",
		.description = "RAN Application Part",
	},
};

static const struct log_info hnbgw_log_info = {
	.cat = log_cat,
	.num_cat = ARRAY_SIZE(log_cat),
};

static struct vty_app_info vty_info = {
	.name		= "OsmoHNBGW",
	.version	= "0",
};

static int daemonize = 0;

static void vty_dump_hnb_info(struct vty *vty, struct hnb_context *hnb)
{
	struct hnbgw_context_map *map;

	vty_out(vty, "HNB \"%s\" MCC %u MNC %u LAC %u RAC %u SAC %u CID %u%s", hnb->identity_info,
			hnb->id.mcc, hnb->id.mnc, hnb->id.lac, hnb->id.rac, hnb->id.sac, hnb->id.cid,
			VTY_NEWLINE);
	vty_out(vty, "   HNBAP ID %u RUA ID %u%s", hnb->hnbap_stream, hnb->rua_stream, VTY_NEWLINE);

	llist_for_each_entry(map, &hnb->map_list, hnb_list) {
		vty_out(vty, " Map %u->%u (RUA->SUA) cnlink=%p state=%u%s", map->rua_ctx_id, map->scu_conn_id,
			map->cn_link, map->state, VTY_NEWLINE);

	}
}

static void vty_dump_ue_info(struct vty *vty, struct ue_context *ue)
{
	vty_out(vty, "UE IMSI \"%s\" context ID %u%s", ue->imsi, ue->context_id, VTY_NEWLINE);
}

DEFUN(show_hnb, show_hnb_cmd, "show hnb all", SHOW_STR "Display information about a HNB")
{
	struct hnb_context *hnb;

	llist_for_each_entry(hnb, &g_hnb_gw->hnb_list, list) {
		vty_dump_hnb_info(vty, hnb);
	}

	return CMD_SUCCESS;
}

DEFUN(show_ue, show_ue_cmd, "show ue all", SHOW_STR "Display information about a UE")
{
	struct ue_context *ue;

	llist_for_each_entry(ue, &g_hnb_gw->ue_list, list) {
		vty_dump_ue_info(vty, ue);
	}

	return CMD_SUCCESS;
}

DEFUN(show_talloc, show_talloc_cmd, "show talloc", SHOW_STR "Display talloc info")
{
	talloc_report_full(tall_hnb_ctx, stderr);
	talloc_report_full(talloc_asn1_ctx, stderr);

	return CMD_SUCCESS;
}

static void hnbgw_vty_init(void)
{
	install_element_ve(&show_hnb_cmd);
	install_element_ve(&show_ue_cmd);
	install_element_ve(&show_talloc_cmd);
}

int main(int argc, char **argv)
{
	struct osmo_sua_user *sua_user;
	struct osmo_sua_link *sua_link;
	struct osmo_stream_srv_link *srv;
	int rc;

	tall_hnb_ctx = talloc_named_const(NULL, 0, "hnb_context");
	talloc_asn1_ctx = talloc_named_const(NULL, 0, "asn1_context");

	g_hnb_gw = hnb_gw_create(tall_hnb_ctx);

	rc = osmo_init_logging(&hnbgw_log_info);
	if (rc < 0)
		exit(1);

	vty_init(&vty_info);
	hnbgw_vty_init();

	rc = telnet_init(NULL, g_hnb_gw, 2323);
	if (rc < 0) {
		perror("Error binding VTY port");
		exit(1);
	}

	osmo_sua_set_log_area(DSUA);
	ranap_set_log_area(DRANAP);

	g_hnb_gw->cnlink_cs = hnbgw_cnlink_init(g_hnb_gw, "127.0.0.1", SUA_PORT, 0);
	g_hnb_gw->cnlink_ps = hnbgw_cnlink_init(g_hnb_gw, "127.0.0.2", SUA_PORT, 1);

	srv = osmo_stream_srv_link_create(tall_hnb_ctx);
	if (!srv) {
		perror("cannot create server");
		exit(1);
	}
	osmo_stream_srv_link_set_data(srv, g_hnb_gw);
	osmo_stream_srv_link_set_proto(srv, IPPROTO_SCTP);
	osmo_stream_srv_link_set_addr(srv, "0.0.0.0");
	osmo_stream_srv_link_set_port(srv, g_hnb_gw->config.iuh_listen_port);
	osmo_stream_srv_link_set_accept_cb(srv, accept_cb);

	if (osmo_stream_srv_link_open(srv) < 0) {
		perror("Cannot oper server");
		exit(1);
	}
	g_hnb_gw->iuh = srv;

	if (daemonize) {
		rc = osmo_daemonize();
		if (rc < 0) {
			perror("Error during daemonize");
			exit(1);
		}
	}

	while (1) {
		rc = osmo_select_main(0);
		if (rc < 0)
			exit(3);
	}

	/* not reached */
	exit(0);
}