Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Handle the connection to the MSC. This include ping/timeout/reconnect |
| 3 | * (C) 2008-2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 2a9eeaa | 2011-04-23 16:37:58 +0200 | [diff] [blame] | 4 | * (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2009-2011 by On-Waves |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 17 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <openbsc/bsc_nat.h> |
Daniel Willmann | f7d557c | 2011-02-18 14:30:25 +0100 | [diff] [blame] | 24 | #include <openbsc/control_cmd.h> |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 25 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | e09919b | 2010-09-16 02:29:45 +0800 | [diff] [blame] | 26 | #include <openbsc/gsm_data.h> |
| 27 | #include <openbsc/ipaccess.h> |
| 28 | #include <openbsc/osmo_msc_data.h> |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 29 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 30 | |
Daniel Willmann | f7d557c | 2011-02-18 14:30:25 +0100 | [diff] [blame] | 31 | #include <osmocom/core/talloc.h> |
| 32 | |
Harald Welte | d36ff76 | 2011-03-23 18:26:56 +0100 | [diff] [blame] | 33 | #include <osmocom/gsm/gsm0808.h> |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 34 | |
| 35 | #include <osmocom/sccp/sccp.h> |
| 36 | |
| 37 | #include <sys/socket.h> |
| 38 | #include <netinet/tcp.h> |
| 39 | #include <unistd.h> |
| 40 | |
| 41 | |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 42 | static void initialize_if_needed(struct bsc_msc_connection *conn); |
Holger Hans Peter Freyther | 2a9eeaa | 2011-04-23 16:37:58 +0200 | [diff] [blame] | 43 | static void send_lacs(struct gsm_network *net, struct bsc_msc_connection *conn); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 44 | static void send_id_get_response(struct osmo_msc_data *data, int fd); |
| 45 | static void send_ping(struct osmo_msc_data *data); |
| 46 | |
| 47 | /* |
| 48 | * MGCP forwarding code |
| 49 | */ |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 50 | static int mgcp_do_read(struct osmo_fd *fd) |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 51 | { |
| 52 | struct osmo_msc_data *data = (struct osmo_msc_data *) fd->data; |
| 53 | struct msgb *mgcp; |
| 54 | int ret; |
| 55 | |
| 56 | mgcp = msgb_alloc_headroom(4096, 128, "mgcp_from_gw"); |
| 57 | if (!mgcp) { |
| 58 | LOGP(DMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n"); |
| 59 | return -1; |
| 60 | } |
| 61 | |
| 62 | ret = read(fd->fd, mgcp->data, 4096 - 128); |
| 63 | if (ret <= 0) { |
| 64 | LOGP(DMGCP, LOGL_ERROR, "Failed to read: %d/%s\n", errno, strerror(errno)); |
| 65 | msgb_free(mgcp); |
| 66 | return -1; |
| 67 | } else if (ret > 4096 - 128) { |
| 68 | LOGP(DMGCP, LOGL_ERROR, "Too much data: %d\n", ret); |
| 69 | msgb_free(mgcp); |
| 70 | return -1; |
| 71 | } |
| 72 | |
| 73 | mgcp->l2h = msgb_put(mgcp, ret); |
Holger Hans Peter Freyther | 368a0a7 | 2011-01-07 16:54:46 +0100 | [diff] [blame] | 74 | msc_queue_write(data->msc_con, mgcp, IPAC_PROTO_MGCP_OLD); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 75 | return 0; |
| 76 | } |
| 77 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 78 | static int mgcp_do_write(struct osmo_fd *fd, struct msgb *msg) |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 79 | { |
| 80 | int ret; |
| 81 | |
| 82 | LOGP(DMGCP, LOGL_DEBUG, "Sending msg to MGCP GW size: %u\n", msg->len); |
| 83 | |
| 84 | ret = write(fd->fd, msg->data, msg->len); |
| 85 | if (ret != msg->len) |
| 86 | LOGP(DMGCP, LOGL_ERROR, "Failed to forward message to MGCP GW (%s).\n", strerror(errno)); |
| 87 | |
| 88 | return ret; |
| 89 | } |
| 90 | |
| 91 | static void mgcp_forward(struct osmo_msc_data *data, struct msgb *msg) |
| 92 | { |
| 93 | struct msgb *mgcp; |
| 94 | |
| 95 | if (msgb_l2len(msg) > 4096) { |
| 96 | LOGP(DMGCP, LOGL_ERROR, "Can not forward too big message.\n"); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | mgcp = msgb_alloc(4096, "mgcp_to_gw"); |
| 101 | if (!mgcp) { |
| 102 | LOGP(DMGCP, LOGL_ERROR, "Failed to send message.\n"); |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | msgb_put(mgcp, msgb_l2len(msg)); |
| 107 | memcpy(mgcp->data, msg->l2h, mgcp->len); |
Pablo Neira Ayuso | e1273b1 | 2011-05-06 12:09:47 +0200 | [diff] [blame] | 108 | if (osmo_wqueue_enqueue(&data->mgcp_agent, mgcp) != 0) { |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 109 | LOGP(DMGCP, LOGL_FATAL, "Could not queue message to MGCP GW.\n"); |
| 110 | msgb_free(mgcp); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static int mgcp_create_port(struct osmo_msc_data *data) |
| 115 | { |
| 116 | int on; |
| 117 | struct sockaddr_in addr; |
| 118 | |
| 119 | data->mgcp_agent.bfd.fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 120 | if (data->mgcp_agent.bfd.fd < 0) { |
| 121 | LOGP(DMGCP, LOGL_FATAL, "Failed to create UDP socket errno: %d\n", errno); |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | on = 1; |
| 126 | setsockopt(data->mgcp_agent.bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 127 | |
| 128 | /* try to bind the socket */ |
| 129 | memset(&addr, 0, sizeof(addr)); |
| 130 | addr.sin_family = AF_INET; |
| 131 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 132 | addr.sin_port = 0; |
| 133 | |
| 134 | if (bind(data->mgcp_agent.bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 135 | LOGP(DMGCP, LOGL_FATAL, "Failed to bind to any port.\n"); |
| 136 | close(data->mgcp_agent.bfd.fd); |
| 137 | data->mgcp_agent.bfd.fd = -1; |
| 138 | return -1; |
| 139 | } |
| 140 | |
| 141 | /* connect to the remote */ |
| 142 | addr.sin_port = htons(2427); |
| 143 | if (connect(data->mgcp_agent.bfd.fd, (struct sockaddr *) & addr, sizeof(addr)) < 0) { |
| 144 | LOGP(DMGCP, LOGL_FATAL, "Failed to connect to local MGCP GW. %s\n", strerror(errno)); |
| 145 | close(data->mgcp_agent.bfd.fd); |
| 146 | data->mgcp_agent.bfd.fd = -1; |
| 147 | return -1; |
| 148 | } |
| 149 | |
Pablo Neira Ayuso | e1273b1 | 2011-05-06 12:09:47 +0200 | [diff] [blame] | 150 | osmo_wqueue_init(&data->mgcp_agent, 10); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 151 | data->mgcp_agent.bfd.when = BSC_FD_READ; |
| 152 | data->mgcp_agent.bfd.data = data; |
| 153 | data->mgcp_agent.read_cb = mgcp_do_read; |
| 154 | data->mgcp_agent.write_cb = mgcp_do_write; |
| 155 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 156 | if (osmo_fd_register(&data->mgcp_agent.bfd) != 0) { |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 157 | LOGP(DMGCP, LOGL_FATAL, "Failed to register BFD\n"); |
| 158 | close(data->mgcp_agent.bfd.fd); |
| 159 | data->mgcp_agent.bfd.fd = -1; |
| 160 | return -1; |
| 161 | } |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Send data to the network |
| 168 | */ |
Holger Hans Peter Freyther | 6098038 | 2010-09-16 02:22:20 +0800 | [diff] [blame] | 169 | int msc_queue_write(struct bsc_msc_connection *conn, struct msgb *msg, int proto) |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 170 | { |
| 171 | ipaccess_prepend_header(msg, proto); |
Pablo Neira Ayuso | e1273b1 | 2011-05-06 12:09:47 +0200 | [diff] [blame] | 172 | if (osmo_wqueue_enqueue(&conn->write_queue, msg) != 0) { |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 173 | LOGP(DMSC, LOGL_FATAL, "Failed to queue IPA/%d\n", proto); |
| 174 | msgb_free(msg); |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 181 | static int msc_alink_do_write(struct osmo_fd *fd, struct msgb *msg) |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 182 | { |
| 183 | int ret; |
| 184 | |
| 185 | LOGP(DMSC, LOGL_DEBUG, "Sending SCCP to MSC: %u\n", msgb_l2len(msg)); |
Pablo Neira Ayuso | c0d17f2 | 2011-05-07 12:12:48 +0200 | [diff] [blame] | 186 | LOGP(DMI, LOGL_DEBUG, "MSC TX %s\n", osmo_hexdump(msg->data, msg->len)); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 187 | |
| 188 | ret = write(fd->fd, msg->data, msg->len); |
| 189 | if (ret < msg->len) |
| 190 | perror("MSC: Failed to send SCCP"); |
| 191 | |
| 192 | return ret; |
| 193 | } |
| 194 | |
Daniel Willmann | f7d557c | 2011-02-18 14:30:25 +0100 | [diff] [blame] | 195 | static void handle_ctrl(struct osmo_msc_data *msc, struct msgb *msg) |
| 196 | { |
| 197 | int ret; |
| 198 | struct ctrl_cmd *cmd; |
| 199 | |
| 200 | cmd = ctrl_cmd_parse(msc->msc_con, msg); |
| 201 | if (!cmd) { |
| 202 | LOGP(DMSC, LOGL_ERROR, "Failed to parse control message.\n"); |
| 203 | cmd = talloc_zero(msc->msc_con, struct ctrl_cmd); |
| 204 | if (!cmd) { |
| 205 | LOGP(DMSC, LOGL_ERROR, "OOM!\n"); |
| 206 | return; |
| 207 | } |
| 208 | cmd->type = CTRL_TYPE_ERROR; |
| 209 | cmd->id = "err"; |
| 210 | cmd->reply = "Failed to parse control message."; |
| 211 | |
| 212 | ctrl_cmd_send(&msc->msc_con->write_queue, cmd); |
| 213 | talloc_free(cmd); |
| 214 | |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | ret = ctrl_cmd_handle(cmd, msc->network); |
| 219 | if (ret != CTRL_CMD_HANDLED) |
| 220 | ctrl_cmd_send(&msc->msc_con->write_queue, cmd); |
| 221 | talloc_free(cmd); |
| 222 | } |
| 223 | |
Holger Hans Peter Freyther | a78b602 | 2011-04-23 15:58:24 +0200 | [diff] [blame] | 224 | static void osmo_ext_handle(struct osmo_msc_data *msc, struct msgb *msg) |
| 225 | { |
| 226 | struct ipaccess_head *hh; |
| 227 | struct ipaccess_head_ext *hh_ext; |
| 228 | |
| 229 | hh = (struct ipaccess_head *) msg->data; |
| 230 | hh_ext = (struct ipaccess_head_ext *) hh->data; |
| 231 | if (msg->len < sizeof(*hh) + sizeof(*hh_ext)) { |
| 232 | LOGP(DMSC, LOGL_ERROR, "Packet too short for extended header.\n"); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | msg->l2h = hh_ext->data; |
| 237 | if (hh_ext->proto == IPAC_PROTO_EXT_MGCP) |
| 238 | mgcp_forward(msc, msg); |
Holger Hans Peter Freyther | 2a9eeaa | 2011-04-23 16:37:58 +0200 | [diff] [blame] | 239 | else if (hh_ext->proto == IPAC_PROTO_EXT_LAC) |
| 240 | send_lacs(msc->network, msc->msc_con); |
Daniel Willmann | f7d557c | 2011-02-18 14:30:25 +0100 | [diff] [blame] | 241 | else if (hh_ext->proto == IPAC_PROTO_EXT_CTRL) |
| 242 | handle_ctrl(msc, msg); |
Holger Hans Peter Freyther | a78b602 | 2011-04-23 15:58:24 +0200 | [diff] [blame] | 243 | } |
| 244 | |
Pablo Neira Ayuso | 4db9299 | 2011-05-06 12:11:23 +0200 | [diff] [blame] | 245 | static int ipaccess_a_fd_cb(struct osmo_fd *bfd) |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 246 | { |
| 247 | int error; |
| 248 | struct msgb *msg = ipaccess_read_msg(bfd, &error); |
| 249 | struct ipaccess_head *hh; |
Holger Hans Peter Freyther | 0425c38 | 2010-11-03 14:46:56 +0100 | [diff] [blame] | 250 | struct osmo_msc_data *data = (struct osmo_msc_data *) bfd->data; |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 251 | |
| 252 | if (!msg) { |
| 253 | if (error == 0) { |
| 254 | LOGP(DMSC, LOGL_ERROR, "The connection to the MSC was lost.\n"); |
| 255 | bsc_msc_lost(data->msc_con); |
| 256 | return -1; |
| 257 | } |
| 258 | |
| 259 | LOGP(DMSC, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); |
| 260 | return -1; |
| 261 | } |
| 262 | |
Harald Welte | 376f782 | 2011-07-11 18:19:33 +0200 | [diff] [blame] | 263 | LOGP(DMI, LOGL_DEBUG, "From MSC: %s proto: %d\n", osmo_hexdump(msg->data, msg->len), msg->l2h[0]); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 264 | |
| 265 | /* handle base message handling */ |
| 266 | hh = (struct ipaccess_head *) msg->data; |
| 267 | ipaccess_rcvmsg_base(msg, bfd); |
| 268 | |
| 269 | /* initialize the networking. This includes sending a GSM08.08 message */ |
| 270 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 271 | if (msg->l2h[0] == IPAC_MSGT_ID_ACK) |
| 272 | initialize_if_needed(data->msc_con); |
| 273 | else if (msg->l2h[0] == IPAC_MSGT_ID_GET) { |
| 274 | send_id_get_response(data, bfd->fd); |
| 275 | } else if (msg->l2h[0] == IPAC_MSGT_PONG) { |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 276 | osmo_timer_del(&data->pong_timer); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 277 | } |
| 278 | } else if (hh->proto == IPAC_PROTO_SCCP) { |
| 279 | sccp_system_incoming(msg); |
Holger Hans Peter Freyther | 368a0a7 | 2011-01-07 16:54:46 +0100 | [diff] [blame] | 280 | } else if (hh->proto == IPAC_PROTO_MGCP_OLD) { |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 281 | mgcp_forward(data, msg); |
Holger Hans Peter Freyther | a78b602 | 2011-04-23 15:58:24 +0200 | [diff] [blame] | 282 | } else if (hh->proto == IPAC_PROTO_OSMO) { |
| 283 | osmo_ext_handle(data, msg); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | msgb_free(msg); |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static void send_ping(struct osmo_msc_data *data) |
| 291 | { |
| 292 | struct msgb *msg; |
| 293 | |
| 294 | msg = msgb_alloc_headroom(4096, 128, "ping"); |
| 295 | if (!msg) { |
| 296 | LOGP(DMSC, LOGL_ERROR, "Failed to create PING.\n"); |
| 297 | return; |
| 298 | } |
| 299 | |
| 300 | msg->l2h = msgb_put(msg, 1); |
| 301 | msg->l2h[0] = IPAC_MSGT_PING; |
| 302 | |
| 303 | msc_queue_write(data->msc_con, msg, IPAC_PROTO_IPACCESS); |
| 304 | } |
| 305 | |
| 306 | static void msc_ping_timeout_cb(void *_data) |
| 307 | { |
| 308 | struct osmo_msc_data *data = (struct osmo_msc_data *) _data; |
| 309 | if (data->ping_timeout < 0) |
| 310 | return; |
| 311 | |
| 312 | send_ping(data); |
| 313 | |
| 314 | /* send another ping in 20 seconds */ |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 315 | osmo_timer_schedule(&data->ping_timer, data->ping_timeout, 0); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 316 | |
| 317 | /* also start a pong timer */ |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 318 | osmo_timer_schedule(&data->pong_timer, data->pong_timeout, 0); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | static void msc_pong_timeout_cb(void *_data) |
| 322 | { |
| 323 | struct osmo_msc_data *data = (struct osmo_msc_data *) _data; |
| 324 | |
| 325 | LOGP(DMSC, LOGL_ERROR, "MSC didn't answer PING. Closing connection.\n"); |
| 326 | bsc_msc_lost(data->msc_con); |
| 327 | } |
| 328 | |
| 329 | static void msc_connection_connected(struct bsc_msc_connection *con) |
| 330 | { |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 331 | struct msc_signal_data sig; |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 332 | struct osmo_msc_data *data; |
| 333 | int ret, on; |
| 334 | on = 1; |
| 335 | ret = setsockopt(con->write_queue.bfd.fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| 336 | if (ret != 0) |
| 337 | LOGP(DMSC, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| 338 | |
| 339 | data = (struct osmo_msc_data *) con->write_queue.bfd.data; |
Holger Hans Peter Freyther | 0425c38 | 2010-11-03 14:46:56 +0100 | [diff] [blame] | 340 | msc_ping_timeout_cb(data); |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 341 | |
| 342 | sig.data = data; |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 343 | osmo_signal_dispatch(SS_MSC, S_MSC_CONNECTED, &sig); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | /* |
| 347 | * The connection to the MSC was lost and we will need to free all |
| 348 | * resources and then attempt to reconnect. |
| 349 | */ |
| 350 | static void msc_connection_was_lost(struct bsc_msc_connection *msc) |
| 351 | { |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 352 | struct msc_signal_data sig; |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 353 | struct osmo_msc_data *data; |
| 354 | |
| 355 | LOGP(DMSC, LOGL_ERROR, "Lost MSC connection. Freing stuff.\n"); |
| 356 | |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 357 | data = (struct osmo_msc_data *) msc->write_queue.bfd.data; |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 358 | osmo_timer_del(&data->ping_timer); |
| 359 | osmo_timer_del(&data->pong_timer); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 360 | |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 361 | sig.data = data; |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 362 | osmo_signal_dispatch(SS_MSC, S_MSC_LOST, &sig); |
Holger Hans Peter Freyther | 0d71163 | 2010-09-16 02:30:36 +0800 | [diff] [blame] | 363 | |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 364 | msc->is_authenticated = 0; |
| 365 | bsc_msc_schedule_connect(msc); |
| 366 | } |
| 367 | |
Holger Hans Peter Freyther | 2a9eeaa | 2011-04-23 16:37:58 +0200 | [diff] [blame] | 368 | static void send_lacs(struct gsm_network *net, struct bsc_msc_connection *conn) |
| 369 | { |
| 370 | struct ipac_ext_lac_cmd *lac; |
| 371 | struct gsm_bts *bts; |
| 372 | struct msgb *msg; |
| 373 | int lacs = 0; |
| 374 | |
| 375 | if (llist_empty(&net->bts_list)) { |
| 376 | LOGP(DMSC, LOGL_ERROR, "No BTSs configured. Not sending LACs.\n"); |
| 377 | return; |
| 378 | } |
| 379 | |
| 380 | msg = msgb_alloc_headroom(4096, 128, "LAC Command"); |
| 381 | if (!msg) { |
| 382 | LOGP(DMSC, LOGL_ERROR, "Failed to create the LAC command.\n"); |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | lac = (struct ipac_ext_lac_cmd *) msgb_put(msg, sizeof(*lac)); |
| 387 | lac->add_remove = 1; |
| 388 | |
| 389 | llist_for_each_entry(bts, &net->bts_list, list) { |
| 390 | if (lacs++ == 0) |
| 391 | lac->lac = htons(bts->location_area_code); |
| 392 | else |
| 393 | msgb_put_u16(msg, htons(bts->location_area_code)); |
| 394 | } |
| 395 | |
| 396 | lac->nr_extra_lacs = lacs - 1; |
| 397 | ipaccess_prepend_header_ext(msg, IPAC_PROTO_EXT_LAC); |
| 398 | msc_queue_write(conn, msg, IPAC_PROTO_OSMO); |
| 399 | } |
| 400 | |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 401 | static void initialize_if_needed(struct bsc_msc_connection *conn) |
| 402 | { |
| 403 | struct msgb *msg; |
| 404 | |
| 405 | if (!conn->is_authenticated) { |
| 406 | /* send a gsm 08.08 reset message from here */ |
| 407 | msg = gsm0808_create_reset(); |
| 408 | if (!msg) { |
| 409 | LOGP(DMSC, LOGL_ERROR, "Failed to create the reset message.\n"); |
| 410 | return; |
| 411 | } |
| 412 | |
Holger Hans Peter Freyther | 784ca9c | 2011-06-04 16:59:37 +0200 | [diff] [blame] | 413 | sccp_write(msg, &sccp_ssn_bssap, &sccp_ssn_bssap, 0, NULL); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 414 | msgb_free(msg); |
| 415 | conn->is_authenticated = 1; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | static void send_id_get_response(struct osmo_msc_data *data, int fd) |
| 420 | { |
| 421 | struct msgb *msg; |
| 422 | |
| 423 | msg = bsc_msc_id_get_resp(data->bsc_token); |
| 424 | if (!msg) |
| 425 | return; |
| 426 | msc_queue_write(data->msc_con, msg, IPAC_PROTO_IPACCESS); |
| 427 | } |
| 428 | |
| 429 | int osmo_bsc_msc_init(struct gsm_network *network) |
| 430 | { |
| 431 | struct osmo_msc_data *data = network->msc_data; |
| 432 | |
| 433 | if (mgcp_create_port(data) != 0) |
| 434 | return -1; |
| 435 | |
Holger Hans Peter Freyther | e188010 | 2011-04-23 23:31:31 +0200 | [diff] [blame] | 436 | data->msc_con = bsc_msc_create(data, &data->dests); |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 437 | if (!data->msc_con) { |
| 438 | LOGP(DMSC, LOGL_ERROR, "Creating the MSC network connection failed.\n"); |
| 439 | return -1; |
| 440 | } |
| 441 | |
| 442 | data->ping_timer.cb = msc_ping_timeout_cb; |
| 443 | data->ping_timer.data = data; |
| 444 | data->pong_timer.cb = msc_pong_timeout_cb; |
| 445 | data->pong_timer.data = data; |
| 446 | |
| 447 | data->msc_con->write_queue.bfd.data = data; |
| 448 | data->msc_con->connection_loss = msc_connection_was_lost; |
| 449 | data->msc_con->connected = msc_connection_connected; |
| 450 | data->msc_con->write_queue.read_cb = ipaccess_a_fd_cb; |
Holger Hans Peter Freyther | f358964 | 2011-02-18 23:39:34 +0100 | [diff] [blame] | 451 | data->msc_con->write_queue.write_cb = msc_alink_do_write; |
Holger Hans Peter Freyther | 5832b3e | 2010-09-16 02:14:41 +0800 | [diff] [blame] | 452 | bsc_msc_connect(data->msc_con); |
| 453 | |
| 454 | return 0; |
| 455 | } |