Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 1 | /* Interaction with the SCCP subsystem */ |
| 2 | /* |
| 3 | * (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 4 | * (C) 2009-2010 by On-Waves |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 15 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 16 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <openbsc/gsm_data.h> |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 23 | #include <openbsc/osmo_bsc.h> |
| 24 | #include <openbsc/osmo_bsc_grace.h> |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 25 | #include <openbsc/osmo_msc_data.h> |
| 26 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 57d3048 | 2010-11-06 23:56:43 +0100 | [diff] [blame] | 27 | #include <openbsc/ipaccess.h> |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 28 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 29 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 30 | #include <osmocom/core/talloc.h> |
Harald Welte | d36ff76 | 2011-03-23 18:26:56 +0100 | [diff] [blame] | 31 | #include <osmocom/gsm/gsm0808.h> |
| 32 | #include <osmocom/gsm/protocol/gsm_08_08.h> |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 33 | |
| 34 | #include <osmocom/sccp/sccp.h> |
| 35 | |
Holger Hans Peter Freyther | c97d9b4 | 2010-11-06 20:23:58 +0100 | [diff] [blame] | 36 | /* SCCP helper */ |
| 37 | #define SCCP_IT_TIMER 60 |
| 38 | |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 39 | static LLIST_HEAD(active_connections); |
| 40 | |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 41 | static void free_queued(struct osmo_bsc_sccp_con *conn) |
| 42 | { |
| 43 | struct msgb *msg; |
| 44 | |
| 45 | while (!llist_empty(&conn->sccp_queue)) { |
| 46 | /* this is not allowed to fail */ |
| 47 | msg = msgb_dequeue(&conn->sccp_queue); |
| 48 | msgb_free(msg); |
| 49 | } |
| 50 | |
| 51 | conn->sccp_queue_size = 0; |
| 52 | } |
| 53 | |
| 54 | static void send_queued(struct osmo_bsc_sccp_con *conn) |
| 55 | { |
| 56 | struct msgb *msg; |
| 57 | |
| 58 | while (!llist_empty(&conn->sccp_queue)) { |
| 59 | /* this is not allowed to fail */ |
| 60 | msg = msgb_dequeue(&conn->sccp_queue); |
| 61 | sccp_connection_write(conn->sccp, msg); |
| 62 | msgb_free(msg); |
| 63 | conn->sccp_queue_size -= 1; |
| 64 | } |
| 65 | } |
| 66 | |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 67 | static void msc_outgoing_sccp_data(struct sccp_connection *conn, |
| 68 | struct msgb *msg, unsigned int len) |
| 69 | { |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 70 | struct osmo_bsc_sccp_con *bsc_con = |
| 71 | (struct osmo_bsc_sccp_con *) conn->data_ctx; |
| 72 | |
| 73 | bsc_handle_dt1(bsc_con, msg, len); |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static void msc_outgoing_sccp_state(struct sccp_connection *conn, int old_state) |
| 77 | { |
Holger Hans Peter Freyther | af4b5fb | 2010-11-07 00:03:02 +0100 | [diff] [blame] | 78 | struct osmo_bsc_sccp_con *con_data; |
| 79 | |
| 80 | if (conn->connection_state >= SCCP_CONNECTION_STATE_RELEASE_COMPLETE) { |
| 81 | con_data = (struct osmo_bsc_sccp_con *) conn->data_ctx; |
| 82 | if(con_data->conn) { |
| 83 | LOGP(DMSC, LOGL_ERROR, |
| 84 | "ERROR: The lchan is still associated\n."); |
| 85 | gsm0808_clear(con_data->conn); |
| 86 | subscr_con_free(con_data->conn); |
| 87 | con_data->conn = NULL; |
| 88 | } |
| 89 | |
| 90 | con_data->sccp = NULL; |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 91 | free_queued(con_data); |
Holger Hans Peter Freyther | af4b5fb | 2010-11-07 00:03:02 +0100 | [diff] [blame] | 92 | sccp_connection_free(conn); |
| 93 | bsc_delete_connection(con_data); |
Holger Hans Peter Freyther | 933daaa | 2010-11-07 00:04:46 +0100 | [diff] [blame] | 94 | } else if (conn->connection_state == SCCP_CONNECTION_STATE_ESTABLISHED) { |
| 95 | LOGP(DMSC, LOGL_DEBUG, "Connection established: %p\n", conn); |
| 96 | con_data = (struct osmo_bsc_sccp_con *) conn->data_ctx; |
| 97 | |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 98 | osmo_timer_del(&con_data->sccp_cc_timeout); |
| 99 | osmo_timer_schedule(&con_data->sccp_it_timeout, SCCP_IT_TIMER, 0); |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 100 | |
| 101 | send_queued(con_data); |
Holger Hans Peter Freyther | af4b5fb | 2010-11-07 00:03:02 +0100 | [diff] [blame] | 102 | } |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 103 | } |
| 104 | |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 105 | static void bsc_sccp_force_free(struct osmo_bsc_sccp_con *data) |
| 106 | { |
| 107 | if (data->conn) { |
| 108 | gsm0808_clear(data->conn); |
| 109 | subscr_con_free(data->conn); |
| 110 | data->conn = NULL; |
| 111 | } |
| 112 | |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 113 | free_queued(data); |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 114 | sccp_connection_force_free(data->sccp); |
| 115 | data->sccp = NULL; |
| 116 | bsc_delete_connection(data); |
| 117 | } |
| 118 | |
Holger Hans Peter Freyther | c97d9b4 | 2010-11-06 20:23:58 +0100 | [diff] [blame] | 119 | static void sccp_it_timeout(void *_data) |
| 120 | { |
| 121 | struct osmo_bsc_sccp_con *data = |
| 122 | (struct osmo_bsc_sccp_con *) _data; |
| 123 | |
| 124 | sccp_connection_send_it(data->sccp); |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 125 | osmo_timer_schedule(&data->sccp_it_timeout, SCCP_IT_TIMER, 0); |
Holger Hans Peter Freyther | c97d9b4 | 2010-11-06 20:23:58 +0100 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static void sccp_cc_timeout(void *_data) |
| 129 | { |
| 130 | struct osmo_bsc_sccp_con *data = |
| 131 | (struct osmo_bsc_sccp_con *) _data; |
| 132 | |
| 133 | if (data->sccp->connection_state >= SCCP_CONNECTION_STATE_ESTABLISHED) |
| 134 | return; |
| 135 | |
| 136 | LOGP(DMSC, LOGL_ERROR, "The connection was never established.\n"); |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 137 | bsc_sccp_force_free(data); |
Holger Hans Peter Freyther | c97d9b4 | 2010-11-06 20:23:58 +0100 | [diff] [blame] | 138 | } |
| 139 | |
Holger Hans Peter Freyther | 784ca9c | 2011-06-04 16:59:37 +0200 | [diff] [blame] | 140 | static void msc_sccp_write_ipa(struct sccp_connection *conn, struct msgb *msg, |
| 141 | void *global_ctx, void *ctx) |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 142 | { |
Holger Hans Peter Freyther | 784ca9c | 2011-06-04 16:59:37 +0200 | [diff] [blame] | 143 | struct gsm_network *net = (struct gsm_network *) global_ctx; |
Holger Hans Peter Freyther | 57d3048 | 2010-11-06 23:56:43 +0100 | [diff] [blame] | 144 | msc_queue_write(net->msc_data->msc_con, msg, IPAC_PROTO_SCCP); |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | static int msc_sccp_accept(struct sccp_connection *connection, void *data) |
| 148 | { |
| 149 | LOGP(DMSC, LOGL_DEBUG, "Rejecting incoming SCCP connection.\n"); |
| 150 | return -1; |
| 151 | } |
| 152 | |
| 153 | static int msc_sccp_read(struct msgb *msgb, unsigned int length, void *data) |
| 154 | { |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 155 | struct gsm_network *net = (struct gsm_network *) data; |
| 156 | return bsc_handle_udt(net, net->msc_data->msc_con, msgb, length); |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 157 | } |
| 158 | |
Holger Hans Peter Freyther | 863a55d | 2010-11-10 09:31:41 +0100 | [diff] [blame] | 159 | int bsc_queue_for_msc(struct osmo_bsc_sccp_con *conn, struct msgb *msg) |
Holger Hans Peter Freyther | 4582586 | 2010-11-04 11:48:49 +0100 | [diff] [blame] | 160 | { |
Holger Hans Peter Freyther | 863a55d | 2010-11-10 09:31:41 +0100 | [diff] [blame] | 161 | struct sccp_connection *sccp = conn->sccp; |
Holger Hans Peter Freyther | ca5c022 | 2010-11-06 23:35:02 +0100 | [diff] [blame] | 162 | |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 163 | if (sccp->connection_state > SCCP_CONNECTION_STATE_ESTABLISHED) { |
| 164 | LOGP(DMSC, LOGL_ERROR, "Connection closing, dropping packet on: %p\n", sccp); |
Holger Hans Peter Freyther | ca5c022 | 2010-11-06 23:35:02 +0100 | [diff] [blame] | 165 | msgb_free(msg); |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 166 | } else if (sccp->connection_state == SCCP_CONNECTION_STATE_ESTABLISHED |
| 167 | && conn->sccp_queue_size == 0) { |
| 168 | sccp_connection_write(sccp, msg); |
| 169 | msgb_free(msg); |
| 170 | } else if (conn->sccp_queue_size > 10) { |
| 171 | LOGP(DMSC, LOGL_ERROR, "Connection closing, dropping packet on: %p\n", sccp); |
| 172 | msgb_free(msg); |
| 173 | } else { |
| 174 | LOGP(DMSC, LOGL_DEBUG, "Queueing packet on %p. Queue size: %d\n", sccp, conn->sccp_queue_size); |
| 175 | conn->sccp_queue_size += 1; |
| 176 | msgb_enqueue(&conn->sccp_queue, msg); |
Holger Hans Peter Freyther | ca5c022 | 2010-11-06 23:35:02 +0100 | [diff] [blame] | 177 | } |
| 178 | |
Holger Hans Peter Freyther | 4582586 | 2010-11-04 11:48:49 +0100 | [diff] [blame] | 179 | return 0; |
| 180 | } |
| 181 | |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 182 | int bsc_create_new_connection(struct gsm_subscriber_connection *conn) |
Holger Hans Peter Freyther | cc48fb8 | 2010-11-05 11:10:46 +0100 | [diff] [blame] | 183 | { |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 184 | struct gsm_network *net; |
| 185 | struct osmo_bsc_sccp_con *bsc_con; |
| 186 | struct sccp_connection *sccp; |
| 187 | |
| 188 | net = conn->bts->network; |
| 189 | if (!net->msc_data->msc_con->is_authenticated) { |
| 190 | LOGP(DMSC, LOGL_ERROR, "Not connected to a MSC. Not forwarding data.\n"); |
| 191 | return -1; |
| 192 | } |
| 193 | |
| 194 | if (!bsc_grace_allow_new_connection(net)) { |
| 195 | LOGP(DMSC, LOGL_NOTICE, "BSC in grace period. No new connections.\n"); |
| 196 | return -1; |
| 197 | } |
| 198 | |
| 199 | sccp = sccp_connection_socket(); |
| 200 | if (!sccp) { |
| 201 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate memory.\n"); |
| 202 | return -ENOMEM; |
| 203 | } |
| 204 | |
| 205 | bsc_con = talloc_zero(conn->bts, struct osmo_bsc_sccp_con); |
| 206 | if (!bsc_con) { |
| 207 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate.\n"); |
| 208 | sccp_connection_free(sccp); |
| 209 | return -1; |
| 210 | } |
| 211 | |
| 212 | /* callbacks */ |
| 213 | sccp->state_cb = msc_outgoing_sccp_state; |
| 214 | sccp->data_cb = msc_outgoing_sccp_data; |
| 215 | sccp->data_ctx = bsc_con; |
| 216 | |
Holger Hans Peter Freyther | c97d9b4 | 2010-11-06 20:23:58 +0100 | [diff] [blame] | 217 | /* prepare the timers */ |
| 218 | bsc_con->sccp_it_timeout.cb = sccp_it_timeout; |
| 219 | bsc_con->sccp_it_timeout.data = bsc_con; |
| 220 | bsc_con->sccp_cc_timeout.cb = sccp_cc_timeout; |
| 221 | bsc_con->sccp_cc_timeout.data = bsc_con; |
| 222 | |
Holger Hans Peter Freyther | b4e72f8 | 2010-11-15 10:31:53 +0100 | [diff] [blame] | 223 | INIT_LLIST_HEAD(&bsc_con->sccp_queue); |
| 224 | |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 225 | bsc_con->sccp = sccp; |
| 226 | bsc_con->msc_con = net->msc_data->msc_con; |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 227 | bsc_con->conn = conn; |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 228 | llist_add(&bsc_con->entry, &active_connections); |
| 229 | conn->sccp_con = bsc_con; |
| 230 | return 0; |
Holger Hans Peter Freyther | cc48fb8 | 2010-11-05 11:10:46 +0100 | [diff] [blame] | 231 | } |
| 232 | |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 233 | int bsc_open_connection(struct osmo_bsc_sccp_con *conn, struct msgb *msg) |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 234 | { |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 235 | osmo_timer_schedule(&conn->sccp_cc_timeout, 10, 0); |
Holger Hans Peter Freyther | cf256d6 | 2010-11-08 18:49:23 +0100 | [diff] [blame] | 236 | sccp_connection_connect(conn->sccp, &sccp_ssn_bssap, msg); |
| 237 | msgb_free(msg); |
| 238 | return 0; |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 239 | } |
| 240 | |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 241 | int bsc_delete_connection(struct osmo_bsc_sccp_con *sccp) |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 242 | { |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 243 | if (!sccp) |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 244 | return 0; |
| 245 | |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 246 | if (sccp->conn) |
| 247 | LOGP(DMSC, LOGL_ERROR, "Should have been cleared.\n"); |
| 248 | |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 249 | llist_del(&sccp->entry); |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 250 | osmo_timer_del(&sccp->sccp_it_timeout); |
| 251 | osmo_timer_del(&sccp->sccp_cc_timeout); |
Holger Hans Peter Freyther | b8781d2 | 2010-11-06 18:08:43 +0100 | [diff] [blame] | 252 | talloc_free(sccp); |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 256 | static void bsc_close_connections(struct bsc_msc_connection *msc_con) |
| 257 | { |
| 258 | struct osmo_bsc_sccp_con *con, *tmp; |
| 259 | |
| 260 | llist_for_each_entry_safe(con, tmp, &active_connections, entry) |
| 261 | bsc_sccp_force_free(con); |
| 262 | } |
| 263 | |
| 264 | static int handle_msc_signal(unsigned int subsys, unsigned int signal, |
| 265 | void *handler_data, void *signal_data) |
| 266 | { |
Holger Hans Peter Freyther | 0e412c7 | 2011-06-27 21:01:55 +0200 | [diff] [blame] | 267 | struct msc_signal_data *msc; |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 268 | |
| 269 | if (subsys != SS_MSC) |
| 270 | return 0; |
| 271 | |
Holger Hans Peter Freyther | 0e412c7 | 2011-06-27 21:01:55 +0200 | [diff] [blame] | 272 | msc = signal_data; |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 273 | if (signal == S_MSC_LOST) |
Holger Hans Peter Freyther | 0e412c7 | 2011-06-27 21:01:55 +0200 | [diff] [blame] | 274 | bsc_close_connections(msc->data->msc_con); |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 279 | int osmo_bsc_sccp_init(struct gsm_network *gsmnet) |
| 280 | { |
| 281 | sccp_set_log_area(DSCCP); |
| 282 | sccp_system_init(msc_sccp_write_ipa, gsmnet); |
| 283 | sccp_connection_set_incoming(&sccp_ssn_bssap, msc_sccp_accept, NULL); |
Holger Hans Peter Freyther | 3485feb | 2010-11-09 23:28:33 +0100 | [diff] [blame] | 284 | sccp_set_read(&sccp_ssn_bssap, msc_sccp_read, gsmnet); |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 285 | |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 286 | osmo_signal_register_handler(SS_MSC, handle_msc_signal, gsmnet); |
Holger Hans Peter Freyther | 00f4cc2 | 2010-11-06 23:50:06 +0100 | [diff] [blame] | 287 | |
Holger Hans Peter Freyther | f3d1ae7 | 2010-11-03 16:40:03 +0100 | [diff] [blame] | 288 | return 0; |
| 289 | } |