blob: f0029264533f3ed5505410b07f34762f39f2fc0f [file] [log] [blame]
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +08001/*
2 * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
3 * (C) 2010 by On-Waves
4 * All Rights Reserved
5 *
6 * This program is free software; you can redistribute it and/or modify
Harald Welte9af6ddf2011-01-01 15:25:50 +01007 * it under the terms of the GNU Affero General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +08009 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Harald Welte9af6ddf2011-01-01 15:25:50 +010014 * GNU Affero General Public License for more details.
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080015 *
Harald Welte9af6ddf2011-01-01 15:25:50 +010016 * You should have received a copy of the GNU Affero General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080018 *
19 */
20
21#include <openbsc/bsc_nat.h>
Holger Hans Peter Freytherc2b31ed2010-07-31 05:17:17 +080022#include <openbsc/bsc_nat_sccp.h>
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080023#include <openbsc/gsm_data.h>
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080024#include <openbsc/debug.h>
Holger Hans Peter Freyther19c530c2010-10-13 23:52:01 +020025#include <openbsc/ipaccess.h>
Holger Hans Peter Freyther241e1302010-03-31 09:16:56 +020026#include <openbsc/mgcp.h>
27#include <openbsc/mgcp_internal.h>
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080028
Harald Welted5db12c2010-08-03 15:11:51 +020029#include <osmocom/sccp/sccp.h>
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +080030
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +020031#include <osmocore/talloc.h>
Holger Hans Peter Freyther13959482010-06-15 18:50:57 +080032#include <osmocore/gsm0808.h>
Holger Hans Peter Freyther69d801e2010-06-15 20:13:33 +080033#include <osmocore/protocol/gsm_08_08.h>
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +020034
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080035#include <netinet/in.h>
36#include <arpa/inet.h>
37
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +020038#include <errno.h>
39#include <unistd.h>
40
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +010041static int bsc_init_endps_if_needed(struct bsc_connection *con)
42{
43 /* we have done that */
44 if (con->_endpoint_status)
45 return 0;
46
47 /* we have no config... */
48 if (!con->cfg)
49 return -1;
50
Holger Hans Peter Freyther7b07b2d2011-02-25 20:38:15 +010051 con->number_endpoints = 31 * con->cfg->number_multiplexes;
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +010052 con->_endpoint_status = talloc_zero_array(con, char,
53 (32 * con->cfg->number_multiplexes) + 1);
54 return con->_endpoint_status == NULL;
55}
56
Holger Hans Peter Freyther45fd07d2010-08-28 18:22:14 +080057static int bsc_assign_endpoint(struct bsc_connection *bsc, struct sccp_connections *con)
58{
Holger Hans Peter Freyther7b07b2d2011-02-25 20:38:15 +010059 const int number_endpoints = bsc->number_endpoints;
Holger Hans Peter Freyther45fd07d2010-08-28 18:22:14 +080060 int i;
61
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +010062 for (i = 1; i <= number_endpoints; ++i) {
Holger Hans Peter Freyther45fd07d2010-08-28 18:22:14 +080063 int endpoint = (bsc->last_endpoint + i) % number_endpoints;
64 if (endpoint == 0)
65 endpoint = 1;
66
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +010067 if (bsc->_endpoint_status[endpoint] == 0) {
68 bsc->_endpoint_status[endpoint] = 1;
Holger Hans Peter Freyther45fd07d2010-08-28 18:22:14 +080069 con->bsc_endp = endpoint;
70 bsc->last_endpoint = endpoint;
71 return 0;
72 }
73 }
74
75 return -1;
76}
77
78static uint16_t create_cic(int endpoint)
79{
80 int timeslot, multiplex;
81
82 mgcp_endpoint_to_timeslot(endpoint, &multiplex, &timeslot);
83 return (multiplex << 5) | (timeslot & 0x1f);
84}
85
86int bsc_mgcp_assign_patch(struct sccp_connections *con, struct msgb *msg)
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080087{
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +080088 struct sccp_connections *mcon;
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080089 struct tlv_parsed tp;
Holger Hans Peter Freythere2c15202010-07-23 19:09:21 +080090 uint16_t cic;
Holger Hans Peter Freytherdbd16fe2010-07-23 19:08:55 +080091 uint8_t timeslot;
92 uint8_t multiplex;
Holger Hans Peter Freyther14069772010-11-04 17:14:41 +010093 unsigned int endp;
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +080094
95 if (!msg->l3h) {
96 LOGP(DNAT, LOGL_ERROR, "Assignment message should have l3h pointer.\n");
97 return -1;
98 }
99
100 if (msgb_l3len(msg) < 3) {
101 LOGP(DNAT, LOGL_ERROR, "Assignment message has not enough space for GSM0808.\n");
102 return -1;
103 }
104
105 tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0);
106 if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) {
107 LOGP(DNAT, LOGL_ERROR, "Circuit identity code not found in assignment message.\n");
108 return -1;
109 }
110
Holger Hans Peter Freythere2c15202010-07-23 19:09:21 +0800111 cic = ntohs(*(uint16_t *)TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE));
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +0800112 timeslot = cic & 0x1f;
113 multiplex = (cic & ~0x1f) >> 5;
114
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800115
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800116 endp = mgcp_timeslot_to_endpoint(multiplex, timeslot);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800117
Holger Hans Peter Freyther14069772010-11-04 17:14:41 +0100118 if (endp >= con->bsc->nat->mgcp_cfg->number_endpoints) {
119 LOGP(DNAT, LOGL_ERROR,
120 "MSC attempted to assign bad endpoint 0x%x\n",
121 endp);
122 return -1;
123 }
124
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800125 /* find stale connections using that endpoint */
126 llist_for_each_entry(mcon, &con->bsc->nat->sccp_connections, list_entry) {
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800127 if (mcon->msc_endp == endp) {
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800128 LOGP(DNAT, LOGL_ERROR,
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800129 "Endpoint %d was assigned to 0x%x and now 0x%x\n",
130 endp,
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800131 sccp_src_ref_to_int(&mcon->patched_ref),
132 sccp_src_ref_to_int(&con->patched_ref));
133 bsc_mgcp_dlcx(mcon);
134 }
135 }
136
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800137 con->msc_endp = endp;
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +0100138 if (bsc_init_endps_if_needed(con->bsc) != 0)
139 return -1;
Holger Hans Peter Freyther45fd07d2010-08-28 18:22:14 +0800140 if (bsc_assign_endpoint(con->bsc, con) != 0)
141 return -1;
142
143 /*
144 * now patch the message for the new CIC...
145 * still assumed to be one multiplex only
146 */
147 cic = htons(create_cic(con->bsc_endp));
148 memcpy((uint8_t *) TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE),
149 &cic, sizeof(cic));
150
Holger Hans Peter Freyther465313e2010-06-15 18:49:53 +0800151 return 0;
152}
153
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800154static void bsc_mgcp_free_endpoint(struct bsc_nat *nat, int i)
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200155{
156 if (nat->bsc_endpoints[i].transaction_id) {
157 talloc_free(nat->bsc_endpoints[i].transaction_id);
158 nat->bsc_endpoints[i].transaction_id = NULL;
159 }
160
Holger Hans Peter Freyther5b2726e2010-08-06 09:05:05 +0800161 nat->bsc_endpoints[i].transaction_state = 0;
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200162 nat->bsc_endpoints[i].bsc = NULL;
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200163}
164
Holger Hans Peter Freyther241e1302010-03-31 09:16:56 +0200165void bsc_mgcp_free_endpoints(struct bsc_nat *nat)
166{
167 int i;
168
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800169 for (i = 1; i < nat->mgcp_cfg->number_endpoints; ++i){
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200170 bsc_mgcp_free_endpoint(nat, i);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800171 mgcp_free_endp(&nat->mgcp_cfg->endpoints[i]);
172 }
Holger Hans Peter Freyther241e1302010-03-31 09:16:56 +0200173}
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200174
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800175/* send a MDCX where we do not want a response */
Holger Hans Peter Freyther601180f2010-08-29 23:40:33 +0800176static void bsc_mgcp_send_mdcx(struct bsc_connection *bsc, int port, struct mgcp_endpoint *endp)
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800177{
178 char buf[2096];
179 int len;
180
181 len = snprintf(buf, sizeof(buf),
Holger Hans Peter Freytherf42f45b2010-04-22 13:06:24 +0800182 "MDCX 23 %x@mgw MGCP 1.0\r\n"
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800183 "Z: noanswer\r\n"
184 "\r\n"
185 "c=IN IP4 %s\r\n"
186 "m=audio %d RTP/AVP 255\r\n",
Holger Hans Peter Freyther601180f2010-08-29 23:40:33 +0800187 port,
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800188 bsc->nat->mgcp_cfg->source_addr,
Holger Hans Peter Freyther58ff2192010-08-05 03:08:35 +0800189 endp->bts_end.local_port);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800190 if (len < 0) {
191 LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n");
192 return;
193 }
Holger Hans Peter Freytherd38aa452010-08-30 11:58:49 +0800194
195 #warning "The MDCX is not send to the BSC. It should"
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800196}
197
198static void bsc_mgcp_send_dlcx(struct bsc_connection *bsc, int endpoint)
199{
200 char buf[2096];
201 int len;
202
203 len = snprintf(buf, sizeof(buf),
Holger Hans Peter Freytherbf812fa2010-08-30 12:01:36 +0800204 "DLCX 26 %x@mgw MGCP 1.0\r\n"
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800205 "Z: noanswer\r\n", endpoint);
206 if (len < 0) {
207 LOGP(DMGCP, LOGL_ERROR, "snprintf for DLCX failed.\n");
208 return;
209 }
210
Holger Hans Peter Freytherdbd16fe2010-07-23 19:08:55 +0800211 bsc_write_mgcp(bsc, (uint8_t *) buf, len);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800212}
213
214void bsc_mgcp_init(struct sccp_connections *con)
215{
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800216 con->msc_endp = -1;
217 con->bsc_endp = -1;
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800218}
219
220void bsc_mgcp_dlcx(struct sccp_connections *con)
221{
222 /* send a DLCX down the stream */
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +0100223 if (con->bsc_endp != -1 && con->bsc->_endpoint_status) {
224 if (con->bsc->_endpoint_status[con->bsc_endp] != 1)
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800225 LOGP(DNAT, LOGL_ERROR, "Endpoint 0x%x was not in use\n", con->bsc_endp);
Holger Hans Peter Freythered500e32011-02-25 17:09:07 +0100226 con->bsc->_endpoint_status[con->bsc_endp] = 0;
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800227 bsc_mgcp_send_dlcx(con->bsc, con->bsc_endp);
228 bsc_mgcp_free_endpoint(con->bsc->nat, con->msc_endp);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800229 }
230
231 bsc_mgcp_init(con);
232}
233
234
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800235struct sccp_connections *bsc_mgcp_find_con(struct bsc_nat *nat, int endpoint)
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200236{
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800237 struct sccp_connections *con = NULL;
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200238 struct sccp_connections *sccp;
239
240 llist_for_each_entry(sccp, &nat->sccp_connections, list_entry) {
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800241 if (sccp->msc_endp == -1)
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200242 continue;
Holger Hans Peter Freytherf4b34392010-08-28 16:08:39 +0800243 if (sccp->msc_endp != endpoint)
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200244 continue;
245
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800246 con = sccp;
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200247 }
248
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800249 if (con)
250 return con;
Holger Hans Peter Freythereb52e892010-04-18 02:14:45 +0800251
Holger Hans Peter Freytherfc9bd232010-04-01 03:55:27 +0200252 LOGP(DMGCP, LOGL_ERROR, "Failed to find the connection.\n");
253 return NULL;
254}
255
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200256int bsc_mgcp_policy_cb(struct mgcp_config *cfg, int endpoint, int state, const char *transaction_id)
257{
258 struct bsc_nat *nat;
259 struct bsc_endpoint *bsc_endp;
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800260 struct sccp_connections *sccp;
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200261 struct mgcp_endpoint *mgcp_endp;
262 struct msgb *bsc_msg;
263
264 nat = cfg->data;
265 bsc_endp = &nat->bsc_endpoints[endpoint];
266 mgcp_endp = &nat->mgcp_cfg->endpoints[endpoint];
267
Holger Hans Peter Freytherfef76122010-04-24 21:05:18 +0800268 if (bsc_endp->transaction_id) {
269 LOGP(DMGCP, LOGL_ERROR, "Endpoint 0x%x had pending transaction: '%s'\n",
270 endpoint, bsc_endp->transaction_id);
271 talloc_free(bsc_endp->transaction_id);
272 bsc_endp->transaction_id = NULL;
Holger Hans Peter Freyther5b2726e2010-08-06 09:05:05 +0800273 bsc_endp->transaction_state = 0;
Holger Hans Peter Freytherfef76122010-04-24 21:05:18 +0800274 }
275 bsc_endp->bsc = NULL;
276
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800277 sccp = bsc_mgcp_find_con(nat, endpoint);
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200278
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800279 if (!sccp) {
Holger Hans Peter Freyther3d194d92010-04-24 21:02:01 +0800280 LOGP(DMGCP, LOGL_ERROR, "Did not find BSC for change on endpoint: 0x%x state: %d\n", endpoint, state);
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200281
282 switch (state) {
283 case MGCP_ENDP_CRCX:
284 return MGCP_POLICY_REJECT;
285 break;
286 case MGCP_ENDP_DLCX:
287 return MGCP_POLICY_CONT;
288 break;
289 case MGCP_ENDP_MDCX:
290 return MGCP_POLICY_CONT;
291 break;
292 default:
293 LOGP(DMGCP, LOGL_FATAL, "Unhandled state: %d\n", state);
294 return MGCP_POLICY_CONT;
295 break;
296 }
297 }
298
Holger Hans Peter Freytherdd16b422010-04-07 09:53:54 +0200299 /* we need to generate a new and patched message */
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800300 bsc_msg = bsc_mgcp_rewrite((char *) nat->mgcp_msg, nat->mgcp_length, sccp->bsc_endp,
Holger Hans Peter Freyther58ff2192010-08-05 03:08:35 +0800301 nat->mgcp_cfg->source_addr, mgcp_endp->bts_end.local_port);
Holger Hans Peter Freytherdd16b422010-04-07 09:53:54 +0200302 if (!bsc_msg) {
303 LOGP(DMGCP, LOGL_ERROR, "Failed to patch the msg.\n");
304 return MGCP_POLICY_CONT;
305 }
306
307
Holger Hans Peter Freytherb3e0a032010-04-04 18:11:49 +0200308 bsc_endp->transaction_id = talloc_strdup(nat, transaction_id);
Holger Hans Peter Freyther5b2726e2010-08-06 09:05:05 +0800309 bsc_endp->transaction_state = state;
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800310 bsc_endp->bsc = sccp->bsc;
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200311
312 /* we need to update some bits */
313 if (state == MGCP_ENDP_CRCX) {
314 struct sockaddr_in sock;
315 socklen_t len = sizeof(sock);
Holger Hans Peter Freyther08a1b162010-04-18 02:26:16 +0800316 if (getpeername(sccp->bsc->write_queue.bfd.fd, (struct sockaddr *) &sock, &len) != 0) {
Holger Hans Peter Freyther92febd32010-04-06 11:17:07 +0200317 LOGP(DMGCP, LOGL_ERROR, "Can not get the peername...%d/%s\n",
318 errno, strerror(errno));
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200319 } else {
Holger Hans Peter Freythera17d7012010-08-05 01:34:51 +0800320 mgcp_endp->bts_end.addr = sock.sin_addr;
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200321 }
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200322
Holger Hans Peter Freythere66cac32010-08-05 01:50:44 +0800323 /* send the message and a fake MDCX to force sending of a dummy packet */
Holger Hans Peter Freyther368a0a72011-01-07 16:54:46 +0100324 bsc_write(sccp->bsc, bsc_msg, IPAC_PROTO_MGCP_OLD);
Holger Hans Peter Freyther601180f2010-08-29 23:40:33 +0800325 bsc_mgcp_send_mdcx(sccp->bsc, sccp->bsc_endp, mgcp_endp);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800326 return MGCP_POLICY_DEFER;
327 } else if (state == MGCP_ENDP_DLCX) {
328 /* we will free the endpoint now and send a DLCX to the BSC */
Holger Hans Peter Freyther3a347f02010-05-01 10:31:53 +0800329 msgb_free(bsc_msg);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800330 bsc_mgcp_dlcx(sccp);
331 return MGCP_POLICY_CONT;
332 } else {
Holger Hans Peter Freyther368a0a72011-01-07 16:54:46 +0100333 bsc_write(sccp->bsc, bsc_msg, IPAC_PROTO_MGCP_OLD);
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800334 return MGCP_POLICY_DEFER;
335 }
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200336}
337
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200338/*
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800339 * We do have a failure, free data downstream..
340 */
341static void free_chan_downstream(struct mgcp_endpoint *endp, struct bsc_endpoint *bsc_endp,
342 struct bsc_connection *bsc)
343{
Holger Hans Peter Freytherc021fbe2010-08-28 16:46:27 +0800344 LOGP(DMGCP, LOGL_ERROR, "No CI, freeing endpoint 0x%x in state %d\n",
345 ENDPOINT_NUMBER(endp), bsc_endp->transaction_state);
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800346
Holger Hans Peter Freytherc021fbe2010-08-28 16:46:27 +0800347 /* if a CRCX failed... send a DLCX down the stream */
348 if (bsc_endp->transaction_state == MGCP_ENDP_CRCX) {
349 struct sccp_connections *con;
350 con = bsc_mgcp_find_con(bsc->nat, ENDPOINT_NUMBER(endp));
351 if (!con) {
352 LOGP(DMGCP, LOGL_ERROR,
353 "No SCCP connection for endp 0x%x\n",
354 ENDPOINT_NUMBER(endp));
355 } else {
356 if (con->bsc == bsc) {
Holger Hans Peter Freyther8574dcf2010-08-29 22:39:07 +0800357 bsc_mgcp_send_dlcx(bsc, con->bsc_endp);
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800358 } else {
Holger Hans Peter Freytherc021fbe2010-08-28 16:46:27 +0800359 LOGP(DMGCP, LOGL_ERROR,
360 "Endpoint belongs to a different BSC\n");
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800361 }
362 }
Holger Hans Peter Freytherc021fbe2010-08-28 16:46:27 +0800363 }
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800364
Holger Hans Peter Freytherc021fbe2010-08-28 16:46:27 +0800365 bsc_mgcp_free_endpoint(bsc->nat, ENDPOINT_NUMBER(endp));
366 mgcp_free_endp(endp);
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800367}
368
369/*
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200370 * We have received a msg from the BSC. We will see if we know
371 * this transaction and if it belongs to the BSC. Then we will
372 * need to patch the content to point to the local network and we
373 * need to update the I: that was assigned by the BSS.
374 */
375void bsc_mgcp_forward(struct bsc_connection *bsc, struct msgb *msg)
376{
377 struct msgb *output;
378 struct bsc_endpoint *bsc_endp = NULL;
379 struct mgcp_endpoint *endp = NULL;
Holger Hans Peter Freytherd2dd6e82010-04-06 11:06:11 +0200380 int i, code;
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200381 char transaction_id[60];
382
383 /* Some assumption that our buffer is big enough.. and null terminate */
384 if (msgb_l2len(msg) > 2000) {
385 LOGP(DMGCP, LOGL_ERROR, "MGCP message too long.\n");
386 return;
387 }
388
389 msg->l2h[msgb_l2len(msg)] = '\0';
390
391 if (bsc_mgcp_parse_response((const char *) msg->l2h, &code, transaction_id) != 0) {
392 LOGP(DMGCP, LOGL_ERROR, "Failed to parse response code.\n");
393 return;
394 }
395
396 for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) {
397 if (bsc->nat->bsc_endpoints[i].bsc != bsc)
398 continue;
Holger Hans Peter Freyther3f7c7d02010-04-05 18:00:05 +0200399 /* no one listening? a bug? */
400 if (!bsc->nat->bsc_endpoints[i].transaction_id)
401 continue;
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200402 if (strcmp(transaction_id, bsc->nat->bsc_endpoints[i].transaction_id) != 0)
403 continue;
404
405 endp = &bsc->nat->mgcp_cfg->endpoints[i];
406 bsc_endp = &bsc->nat->bsc_endpoints[i];
407 break;
408 }
409
410 if (!bsc_endp) {
Holger Hans Peter Freytherb9ac37d2010-04-05 17:58:52 +0200411 LOGP(DMGCP, LOGL_ERROR, "Could not find active endpoint: %s for msg: '%s'\n",
412 transaction_id, (const char *) msg->l2h);
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200413 return;
414 }
415
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800416 endp->ci = bsc_mgcp_extract_ci((const char *) msg->l2h);
Holger Hans Peter Freytherb84b5f62010-08-06 08:34:46 +0800417 if (endp->ci == CI_UNUSED) {
Holger Hans Peter Freyther7d476012010-08-06 19:16:34 +0800418 free_chan_downstream(endp, bsc_endp, bsc);
Holger Hans Peter Freytherb84b5f62010-08-06 08:34:46 +0800419 return;
420 }
Holger Hans Peter Freytherdd16b422010-04-07 09:53:54 +0200421
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200422 /* free some stuff */
423 talloc_free(bsc_endp->transaction_id);
424 bsc_endp->transaction_id = NULL;
Holger Hans Peter Freyther5b2726e2010-08-06 09:05:05 +0800425 bsc_endp->transaction_state = 0;
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200426
Holger Hans Peter Freytherdd16b422010-04-07 09:53:54 +0200427 /*
428 * rewrite the information. In case the endpoint was deleted
429 * there should be nothing for us to rewrite so putting endp->rtp_port
430 * with the value of 0 should be no problem.
431 */
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800432 output = bsc_mgcp_rewrite((char * ) msg->l2h, msgb_l2len(msg), -1,
Holger Hans Peter Freyther58ff2192010-08-05 03:08:35 +0800433 bsc->nat->mgcp_cfg->source_addr, endp->net_end.local_port);
Holger Hans Peter Freyther5cc94fb2010-04-05 22:56:49 +0200434
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200435 if (!output) {
436 LOGP(DMGCP, LOGL_ERROR, "Failed to rewrite MGCP msg.\n");
437 return;
438 }
439
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800440 if (write_queue_enqueue(&bsc->nat->mgcp_cfg->gw_fd, output) != 0) {
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200441 LOGP(DMGCP, LOGL_ERROR, "Failed to queue MGCP msg.\n");
442 msgb_free(output);
443 }
444}
445
446int bsc_mgcp_parse_response(const char *str, int *code, char transaction[60])
447{
448 /* we want to parse two strings */
449 return sscanf(str, "%3d %59s\n", code, transaction) != 2;
450}
451
Holger Hans Peter Freyther46340132010-08-06 08:26:54 +0800452uint32_t bsc_mgcp_extract_ci(const char *str)
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200453{
Holger Hans Peter Freyther46340132010-08-06 08:26:54 +0800454 unsigned int ci;
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200455 char *res = strstr(str, "I: ");
Holger Hans Peter Freyther9c31cfc2010-08-06 08:19:05 +0800456 if (!res) {
457 LOGP(DMGCP, LOGL_ERROR, "No CI in msg '%s'\n", str);
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200458 return CI_UNUSED;
Holger Hans Peter Freyther9c31cfc2010-08-06 08:19:05 +0800459 }
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200460
Holger Hans Peter Freyther46340132010-08-06 08:26:54 +0800461 if (sscanf(res, "I: %u", &ci) != 1) {
Holger Hans Peter Freyther9c31cfc2010-08-06 08:19:05 +0800462 LOGP(DMGCP, LOGL_ERROR, "Failed to parse CI in msg '%s'\n", str);
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200463 return CI_UNUSED;
Holger Hans Peter Freyther9c31cfc2010-08-06 08:19:05 +0800464 }
465
Holger Hans Peter Freyther3c3bce12010-04-01 10:16:28 +0200466 return ci;
467}
468
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800469static void patch_mgcp(struct msgb *output, const char *op, const char *tok,
470 int endp, int len, int cr)
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200471{
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800472 int slen;
473 int ret;
474 char buf[40];
475
476 buf[0] = buf[39] = '\0';
477 ret = sscanf(tok, "%*s %s", buf);
478
479 slen = sprintf((char *) output->l3h, "%s %s %x@mgw MGCP 1.0%s",
480 op, buf, endp, cr ? "\r\n" : "\n");
481 output->l3h = msgb_put(output, slen);
482}
483
484/* we need to replace some strings... */
485struct msgb *bsc_mgcp_rewrite(char *input, int length, int endpoint, const char *ip, int port)
486{
487 static const char *crcx_str = "CRCX ";
488 static const char *dlcx_str = "DLCX ";
489 static const char *mdcx_str = "MDCX ";
490
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200491 static const char *ip_str = "c=IN IP4 ";
492 static const char *aud_str = "m=audio ";
493
494 char buf[128];
495 char *running, *token;
496 struct msgb *output;
497
Holger Hans Peter Freyther8d200652010-04-04 18:09:10 +0200498 if (length > 4096 - 128) {
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200499 LOGP(DMGCP, LOGL_ERROR, "Input is too long.\n");
500 return NULL;
501 }
502
503 output = msgb_alloc_headroom(4096, 128, "MGCP rewritten");
504 if (!output) {
505 LOGP(DMGCP, LOGL_ERROR, "Failed to allocate new MGCP msg.\n");
506 return NULL;
507 }
508
Holger Hans Peter Freyther8d200652010-04-04 18:09:10 +0200509 running = input;
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200510 output->l2h = output->data;
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800511 output->l3h = output->l2h;
Holger Hans Peter Freyther9e5300a2010-04-04 19:34:44 +0200512 for (token = strsep(&running, "\n"); running; token = strsep(&running, "\n")) {
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200513 int len = strlen(token);
Holger Hans Peter Freyther9e5300a2010-04-04 19:34:44 +0200514 int cr = len > 0 && token[len - 1] == '\r';
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200515
Holger Hans Peter Freytherf7c86c52010-08-30 13:44:32 +0800516 if (strncmp(crcx_str, token, (sizeof crcx_str) - 1) == 0) {
517 patch_mgcp(output, "CRCX", token, endpoint, len, cr);
518 } else if (strncmp(dlcx_str, token, (sizeof dlcx_str) - 1) == 0) {
519 patch_mgcp(output, "DLCX", token, endpoint, len, cr);
520 } else if (strncmp(mdcx_str, token, (sizeof mdcx_str) - 1) == 0) {
521 patch_mgcp(output, "MDCX", token, endpoint, len, cr);
522 } else if (strncmp(ip_str, token, (sizeof ip_str) - 1) == 0) {
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200523 output->l3h = msgb_put(output, strlen(ip_str));
524 memcpy(output->l3h, ip_str, strlen(ip_str));
525 output->l3h = msgb_put(output, strlen(ip));
526 memcpy(output->l3h, ip, strlen(ip));
Holger Hans Peter Freyther9e5300a2010-04-04 19:34:44 +0200527
528 if (cr) {
529 output->l3h = msgb_put(output, 2);
530 output->l3h[0] = '\r';
531 output->l3h[1] = '\n';
532 } else {
533 output->l3h = msgb_put(output, 1);
534 output->l3h[0] = '\n';
535 }
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200536 } else if (strncmp(aud_str, token, (sizeof aud_str) - 1) == 0) {
537 int payload;
538 if (sscanf(token, "m=audio %*d RTP/AVP %d", &payload) != 1) {
539 LOGP(DMGCP, LOGL_ERROR, "Could not parsed audio line.\n");
540 msgb_free(output);
541 return NULL;
542 }
543
Holger Hans Peter Freyther9e5300a2010-04-04 19:34:44 +0200544 snprintf(buf, sizeof(buf)-1, "m=audio %d RTP/AVP %d%s",
545 port, payload, cr ? "\r\n" : "\n");
Holger Hans Peter Freyther76c83542010-04-01 06:48:52 +0200546 buf[sizeof(buf)-1] = '\0';
547
548 output->l3h = msgb_put(output, strlen(buf));
549 memcpy(output->l3h, buf, strlen(buf));
550 } else {
551 output->l3h = msgb_put(output, len + 1);
552 memcpy(output->l3h, token, len);
553 output->l3h[len] = '\n';
554 }
555 }
556
557 return output;
558}
559
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200560static int mgcp_do_read(struct bsc_fd *fd)
561{
562 struct bsc_nat *nat;
563 struct msgb *msg, *resp;
564 int rc;
565
Holger Hans Peter Freyther8d200652010-04-04 18:09:10 +0200566 nat = fd->data;
567
568 rc = read(fd->fd, nat->mgcp_msg, sizeof(nat->mgcp_msg) - 1);
569 if (rc <= 0) {
570 LOGP(DMGCP, LOGL_ERROR, "Failed to read errno: %d\n", errno);
571 return -1;
572 }
573
574 nat->mgcp_msg[rc] = '\0';
575 nat->mgcp_length = rc;
576
577 msg = msgb_alloc(sizeof(nat->mgcp_msg), "MGCP GW Read");
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200578 if (!msg) {
579 LOGP(DMGCP, LOGL_ERROR, "Failed to create buffer.\n");
580 return -1;
581 }
582
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200583 msg->l2h = msgb_put(msg, rc);
Holger Hans Peter Freyther8d200652010-04-04 18:09:10 +0200584 memcpy(msg->l2h, nat->mgcp_msg, msgb_l2len(msg));
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200585 resp = mgcp_handle_message(nat->mgcp_cfg, msg);
586 msgb_free(msg);
587
588 /* we do have a direct answer... e.g. AUEP */
589 if (resp) {
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800590 if (write_queue_enqueue(&nat->mgcp_cfg->gw_fd, resp) != 0) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200591 LOGP(DMGCP, LOGL_ERROR, "Failed to enqueue msg.\n");
592 msgb_free(resp);
593 }
594 }
595
596 return 0;
597}
598
599static int mgcp_do_write(struct bsc_fd *bfd, struct msgb *msg)
600{
601 int rc;
602
603 rc = write(bfd->fd, msg->data, msg->len);
604
605 if (rc != msg->len) {
606 LOGP(DMGCP, LOGL_ERROR, "Failed to write msg to MGCP CallAgent.\n");
607 return -1;
608 }
609
610 return rc;
611}
612
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800613int bsc_mgcp_nat_init(struct bsc_nat *nat)
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200614{
615 int on;
616 struct sockaddr_in addr;
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800617 struct mgcp_config *cfg = nat->mgcp_cfg;
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200618
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800619 if (!cfg->call_agent_addr) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200620 LOGP(DMGCP, LOGL_ERROR, "The BSC nat requires the call agent ip to be set.\n");
621 return -1;
622 }
623
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800624 if (cfg->bts_ip) {
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200625 LOGP(DMGCP, LOGL_ERROR, "Do not set the BTS ip for the nat.\n");
626 return -1;
627 }
628
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800629 cfg->gw_fd.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
630 if (cfg->gw_fd.bfd.fd < 0) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200631 LOGP(DMGCP, LOGL_ERROR, "Failed to create MGCP socket. errno: %d\n", errno);
632 return -1;
633 }
634
635 on = 1;
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800636 setsockopt(cfg->gw_fd.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200637
638 addr.sin_family = AF_INET;
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800639 addr.sin_port = htons(cfg->source_port);
640 inet_aton(cfg->source_addr, &addr.sin_addr);
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200641
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800642 if (bind(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200643 LOGP(DMGCP, LOGL_ERROR, "Failed to bind. errno: %d\n", errno);
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800644 close(cfg->gw_fd.bfd.fd);
645 cfg->gw_fd.bfd.fd = -1;
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200646 return -1;
647 }
648
649 addr.sin_port = htons(2727);
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800650 inet_aton(cfg->call_agent_addr, &addr.sin_addr);
651 if (connect(cfg->gw_fd.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200652 LOGP(DMGCP, LOGL_ERROR, "Failed to connect to: '%s'. errno: %d\n",
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800653 cfg->call_agent_addr, errno);
654 close(cfg->gw_fd.bfd.fd);
655 cfg->gw_fd.bfd.fd = -1;
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200656 return -1;
657 }
658
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800659 write_queue_init(&cfg->gw_fd, 10);
660 cfg->gw_fd.bfd.when = BSC_FD_READ;
661 cfg->gw_fd.bfd.data = nat;
662 cfg->gw_fd.read_cb = mgcp_do_read;
663 cfg->gw_fd.write_cb = mgcp_do_write;
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200664
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800665 if (bsc_register_fd(&cfg->gw_fd.bfd) != 0) {
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200666 LOGP(DMGCP, LOGL_ERROR, "Failed to register MGCP fd.\n");
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800667 close(cfg->gw_fd.bfd.fd);
668 cfg->gw_fd.bfd.fd = -1;
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200669 return -1;
670 }
671
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200672 /* some more MGCP config handling */
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800673 cfg->data = nat;
674 cfg->policy_cb = bsc_mgcp_policy_cb;
675 cfg->force_realloc = 1;
Holger Hans Peter Freytherd5e6c232010-08-05 10:08:36 +0000676
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800677 if (cfg->bts_ip)
678 talloc_free(cfg->bts_ip);
679 cfg->bts_ip = "";
Holger Hans Peter Freytherd5e6c232010-08-05 10:08:36 +0000680
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200681 nat->bsc_endpoints = talloc_zero_array(nat,
682 struct bsc_endpoint,
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800683 cfg->number_endpoints + 1);
Holger Hans Peter Freyther3c792142010-09-19 04:34:04 +0800684 if (!nat->bsc_endpoints) {
685 LOGP(DMGCP, LOGL_ERROR, "Failed to allocate nat endpoints\n");
Holger Hans Peter Freyther249d69a2010-09-18 21:13:54 +0800686 close(cfg->gw_fd.bfd.fd);
687 cfg->gw_fd.bfd.fd = -1;
Holger Hans Peter Freyther3c792142010-09-19 04:34:04 +0800688 return -1;
689 }
Holger Hans Peter Freythera0df82d2010-04-01 08:21:33 +0200690
Holger Hans Peter Freytherf2eedff2010-09-19 04:36:07 +0800691 if (mgcp_reset_transcoder(cfg) < 0) {
692 LOGP(DMGCP, LOGL_ERROR, "Failed to send packet to the transcoder.\n");
693 talloc_free(nat->bsc_endpoints);
694 nat->bsc_endpoints = NULL;
695 close(cfg->gw_fd.bfd.fd);
696 cfg->gw_fd.bfd.fd = -1;
697 return -1;
698 }
699
Holger Hans Peter Freythera7f80182010-03-31 13:02:22 +0200700 return 0;
701}
Holger Hans Peter Freyther26a43892010-04-05 23:09:27 +0200702
703void bsc_mgcp_clear_endpoints_for(struct bsc_connection *bsc)
704{
Holger Hans Peter Freyther8330c1c2010-06-17 18:29:42 +0800705 struct rate_ctr *ctr = NULL;
Holger Hans Peter Freyther26a43892010-04-05 23:09:27 +0200706 int i;
Holger Hans Peter Freyther8330c1c2010-06-17 18:29:42 +0800707
708 if (bsc->cfg)
709 ctr = &bsc->cfg->stats.ctrg->ctr[BCFG_CTR_DROPPED_CALLS];
710
Holger Hans Peter Freyther26a43892010-04-05 23:09:27 +0200711 for (i = 1; i < bsc->nat->mgcp_cfg->number_endpoints; ++i) {
712 struct bsc_endpoint *bsc_endp = &bsc->nat->bsc_endpoints[i];
713
714 if (bsc_endp->bsc != bsc)
715 continue;
716
Holger Hans Peter Freyther8330c1c2010-06-17 18:29:42 +0800717 if (ctr)
718 rate_ctr_inc(ctr);
719
Holger Hans Peter Freyther7b7eef62010-04-22 12:08:17 +0800720 bsc_mgcp_free_endpoint(bsc->nat, i);
Holger Hans Peter Freyther26a43892010-04-05 23:09:27 +0200721 mgcp_free_endp(&bsc->nat->mgcp_cfg->endpoints[i]);
722 }
723}