aboutsummaryrefslogtreecommitdiffstats
path: root/src/luop.c
blob: 937c02c9e263aa5414180d94c3999cb29545e929 (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
/* OsmoHLR TX/RX lu operations */

/* (C) 2017 sysmocom s.f.m.c. GmbH <info@sysmocom.de>
 * All Rights Reserved
 *
 * Author: Harald Welte <laforge@gnumonks.org>
 *
 * 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 <stdbool.h>
#include <string.h>
#include <errno.h>

#include <osmocom/core/logging.h>
#include <osmocom/gsm/gsm48_ie.h>
#include <osmocom/gsm/gsup.h>
#include <osmocom/gsm/apn.h>

#include "gsup_server.h"
#include "gsup_router.h"
#include "logging.h"
#include "luop.h"

const struct value_string lu_state_names[] = {
	{ LU_S_NULL,			"NULL" },
	{ LU_S_LU_RECEIVED,		"LU RECEIVED" },
	{ LU_S_CANCEL_SENT,		"CANCEL SENT" },
	{ LU_S_CANCEL_ACK_RECEIVED,	"CANCEL-ACK RECEIVED" },
	{ LU_S_ISD_SENT,		"ISD SENT" },
	{ LU_S_ISD_ACK_RECEIVED,	"ISD-ACK RECEIVED" },
	{ LU_S_COMPLETE,		"COMPLETE" },
	{ 0, NULL }
};

/* Transmit a given GSUP message for the given LU operation */
static void _luop_tx_gsup(struct lu_operation *luop,
			  const struct osmo_gsup_message *gsup)
{
	struct msgb *msg_out;

	msg_out = msgb_alloc_headroom(1024+16, 16, "GSUP LUOP");
	osmo_gsup_encode(msg_out, gsup);

	osmo_gsup_addr_send(luop->gsup_server, luop->peer,
			    talloc_total_size(luop->peer),
			    msg_out);
}

static inline void fill_gsup_msg(struct osmo_gsup_message *out,
				 const struct lu_operation *lu,
				 enum osmo_gsup_message_type mt)
{
	memset(out, 0, sizeof(struct osmo_gsup_message));
	if (lu)
		osmo_strlcpy(out->imsi, lu->subscr.imsi,
			     GSM23003_IMSI_MAX_DIGITS + 1);
	out->message_type = mt;
}

/* timer call-back in case LU operation doesn't receive an response */
static void lu_op_timer_cb(void *data)
{
	struct lu_operation *luop = data;

	DEBUGP(DMAIN, "LU OP timer expired in state %s\n",
		get_value_string(lu_state_names, luop->state));

	switch (luop->state) {
	case LU_S_CANCEL_SENT:
		break;
	case LU_S_ISD_SENT:
		break;
	default:
		break;
	}

	lu_op_tx_error(luop, GMM_CAUSE_NET_FAIL);
}

bool lu_op_fill_subscr(struct lu_operation *luop, struct db_context *dbc,
		       const char *imsi)
{
	struct hlr_subscriber *subscr = &luop->subscr;

	if (db_subscr_get(dbc, imsi, subscr) < 0)
		return false;

	return true;
}

struct lu_operation *lu_op_alloc(struct osmo_gsup_server *srv)
{
	struct lu_operation *luop;

	luop = talloc_zero(srv, struct lu_operation);
	OSMO_ASSERT(luop);
	luop->gsup_server = srv;
	luop->timer.cb = lu_op_timer_cb;
	luop->timer.data = luop;

	return luop;
}

struct lu_operation *lu_op_alloc_conn(struct osmo_gsup_conn *conn)
{
	uint8_t *peer_addr;
	struct lu_operation *luop = lu_op_alloc(conn->server);
	int rc = osmo_gsup_conn_ccm_get(conn, &peer_addr, IPAC_IDTAG_SERNR);
	if (rc < 0)
		return NULL;

	luop->peer = talloc_memdup(luop, peer_addr, rc);

	return luop;
}

/* FIXME: this doesn't seem to work at all */
struct lu_operation *lu_op_by_imsi(const char *imsi,
				   const struct llist_head *lst)
{
	struct lu_operation *luop;

	llist_for_each_entry(luop, lst, list) {
		if (!strcmp(imsi, luop->subscr.imsi))
			return luop;
	}
	return NULL;
}

void lu_op_statechg(struct lu_operation *luop, enum lu_state new_state)
{
	enum lu_state old_state = luop->state;

	DEBUGP(DMAIN, "LU OP state change: %s -> ",
		get_value_string(lu_state_names, old_state));
	DEBUGPC(DMAIN, "%s\n",
		get_value_string(lu_state_names, new_state));

	luop->state = new_state;
}

/* Send a msgb to a given address using routing */
int osmo_gsup_addr_send(struct osmo_gsup_server *gs,
			const uint8_t *addr, size_t addrlen,
			struct msgb *msg)
{
	struct osmo_gsup_conn *conn;

	conn = gsup_route_find(gs, addr, addrlen);
	if (!conn) {
		DEBUGP(DMAIN, "Cannot find route for addr %s\n", addr);
		msgb_free(msg);
		return -ENODEV;
	}

	return osmo_gsup_conn_send(conn, msg);
}

/*! Transmit UPD_LOC_ERROR and destroy lu_operation */
void lu_op_tx_error(struct lu_operation *luop, enum gsm48_gmm_cause cause)
{
	struct osmo_gsup_message gsup;

	DEBUGP(DMAIN, "%s: LU OP Tx Error (cause %s)\n",
	       luop->subscr.imsi, get_value_string(gsm48_gmm_cause_names,
						   cause));

	fill_gsup_msg(&gsup, luop, OSMO_GSUP_MSGT_UPDATE_LOCATION_ERROR);
	gsup.cause = cause;

	_luop_tx_gsup(luop, &gsup);

	llist_del(&luop->list);
	talloc_free(luop);
}

/*! Transmit UPD_LOC_RESULT and destroy lu_operation */
void lu_op_tx_ack(struct lu_operation *luop)
{
	struct osmo_gsup_message gsup;

	fill_gsup_msg(&gsup, luop, OSMO_GSUP_MSGT_UPDATE_LOCATION_RESULT);
	//FIXME gsup.hlr_enc;

	_luop_tx_gsup(luop, &gsup);

	llist_del(&luop->list);
	talloc_free(luop);
}

/*! Send Cancel Location to old VLR/SGSN */
void lu_op_tx_cancel_old(struct lu_operation *luop)
{
	struct osmo_gsup_message gsup;

	OSMO_ASSERT(luop->state == LU_S_LU_RECEIVED);

	fill_gsup_msg(&gsup, NULL, OSMO_GSUP_MSGT_LOCATION_CANCEL_REQUEST);
	//gsup.cause = FIXME;
	//gsup.cancel_type = FIXME;

	_luop_tx_gsup(luop, &gsup);

	lu_op_statechg(luop, LU_S_CANCEL_SENT);
	osmo_timer_schedule(&luop->timer, CANCEL_TIMEOUT_SECS, 0);
}

/*! Transmit Insert Subscriber Data to new VLR/SGSN */
void lu_op_tx_insert_subscr_data(struct lu_operation *luop)
{
	struct osmo_gsup_message gsup;
	uint8_t apn[APN_MAXLEN];
	uint8_t msisdn_enc[43]; /* TODO use constant; TS 24.008 10.5.4.7 */
	int l;

	OSMO_ASSERT(luop->state == LU_S_LU_RECEIVED ||
		    luop->state == LU_S_CANCEL_ACK_RECEIVED);

	fill_gsup_msg(&gsup, luop, OSMO_GSUP_MSGT_INSERT_DATA_REQUEST);

	l = gsm48_encode_bcd_number(msisdn_enc, sizeof(msisdn_enc), 0,
				    luop->subscr.msisdn);
	if (l < 1) {
		LOGP(DMAIN, LOGL_ERROR,
		     "%s: Error: cannot encode MSISDN '%s'\n",
		     luop->subscr.imsi, luop->subscr.msisdn);
		lu_op_tx_error(luop, GMM_CAUSE_PROTO_ERR_UNSPEC);
		return;
	}
	gsup.msisdn_enc = msisdn_enc;
	gsup.msisdn_enc_len = l;

	/* FIXME: deal with encoding the following data */
	gsup.hlr_enc;

	if (luop->is_ps) {
		/* FIXME: PDP infos - use more fine-grained access control
		   instead of wildcard APN */
		l = osmo_apn_from_str(apn, sizeof(apn), "*");
		if (l > 0) {
			gsup.pdp_infos[0].apn_enc = apn;
			gsup.pdp_infos[0].apn_enc_len = l;
			gsup.pdp_infos[0].have_info = 1;
			gsup.num_pdp_infos = 1;
			/* FIXME: use real value: */
			gsup.pdp_infos[0].context_id = 1;
		}
	}

	/* Send ISD to new VLR/SGSN */
	_luop_tx_gsup(luop, &gsup);

	lu_op_statechg(luop, LU_S_ISD_SENT);
	osmo_timer_schedule(&luop->timer, ISD_TIMEOUT_SECS, 0);
}

/*! Transmit Delete Subscriber Data to new VLR/SGSN */
void lu_op_tx_del_subscr_data(struct lu_operation *luop)
{
	struct osmo_gsup_message gsup;

	fill_gsup_msg(&gsup, luop, OSMO_GSUP_MSGT_DELETE_DATA_REQUEST);

	gsup.cn_domain = OSMO_GSUP_CN_DOMAIN_PS;

	/* Send ISD to new VLR/SGSN */
	_luop_tx_gsup(luop, &gsup);
}