Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 1 | /* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 2 | * (C) 2009-2010 by On-Waves |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 6 | * it under the terms of the GNU Affero General Public License as published by |
| 7 | * the Free Software Foundation; either version 3 of the License, or |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 13 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 14 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 15 | * You should have received a copy of the GNU Affero General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <openbsc/osmo_bsc.h> |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 21 | #include <openbsc/osmo_msc_data.h> |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 22 | #include <openbsc/debug.h> |
| 23 | |
Harald Welte | d36ff76 | 2011-03-23 18:26:56 +0100 | [diff] [blame] | 24 | #include <osmocom/gsm/protocol/gsm_08_08.h> |
| 25 | #include <osmocom/gsm/gsm0808.h> |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 26 | |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 27 | #define return_when_not_connected(conn) \ |
| 28 | if (!conn->sccp_con) {\ |
| 29 | LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \ |
| 30 | return; \ |
| 31 | } |
| 32 | |
| 33 | #define return_when_not_connected_val(conn, ret) \ |
| 34 | if (!conn->sccp_con) {\ |
| 35 | LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \ |
| 36 | return ret; \ |
| 37 | } |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 38 | |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 39 | #define queue_msg_or_return(resp) \ |
| 40 | if (!resp) { \ |
| 41 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); \ |
| 42 | return; \ |
| 43 | } \ |
Holger Hans Peter Freyther | 863a55d | 2010-11-10 09:31:41 +0100 | [diff] [blame] | 44 | bsc_queue_for_msc(conn->sccp_con, resp); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 45 | |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 46 | static uint16_t get_network_code_for_msc(struct gsm_network *net) |
| 47 | { |
| 48 | if (net->msc_data->core_ncc != -1) |
| 49 | return net->msc_data->core_ncc; |
| 50 | return net->network_code; |
| 51 | } |
| 52 | |
| 53 | static uint16_t get_country_code_for_msc(struct gsm_network *net) |
| 54 | { |
| 55 | if (net->msc_data->core_mcc != -1) |
| 56 | return net->msc_data->core_mcc; |
| 57 | return net->country_code; |
| 58 | } |
| 59 | |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 60 | static void bsc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci) |
| 61 | { |
Holger Hans Peter Freyther | c8166f3 | 2010-11-04 12:28:32 +0100 | [diff] [blame] | 62 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 63 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | c8166f3 | 2010-11-04 12:28:32 +0100 | [diff] [blame] | 64 | |
| 65 | resp = gsm0808_create_sapi_reject(dlci); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 66 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static void bsc_cipher_mode_compl(struct gsm_subscriber_connection *conn, |
| 70 | struct msgb *msg, uint8_t chosen_encr) |
| 71 | { |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 72 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 73 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 74 | |
| 75 | LOGP(DMSC, LOGL_DEBUG, "CIPHER MODE COMPLETE from MS, forwarding to MSC\n"); |
| 76 | resp = gsm0808_create_cipher_complete(msg, chosen_encr); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 77 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 78 | } |
| 79 | |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 80 | /* |
| 81 | * Instruct to reserve data for a new connectiom, create the complete |
| 82 | * layer three message, send it to open the connection. |
| 83 | */ |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 84 | static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| 85 | uint16_t chosen_channel) |
| 86 | { |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 87 | struct msgb *resp; |
| 88 | uint16_t network_code = get_network_code_for_msc(conn->bts->network); |
| 89 | uint16_t country_code = get_country_code_for_msc(conn->bts->network); |
| 90 | |
| 91 | /* allocate resource for a new connection */ |
| 92 | if (bsc_create_new_connection(conn) != 0) |
| 93 | return BSC_API_CONN_POL_REJECT; |
| 94 | |
| 95 | bsc_scan_bts_msg(conn, msg); |
| 96 | resp = gsm0808_create_layer3(msg, network_code, country_code, |
| 97 | conn->bts->location_area_code, |
| 98 | conn->bts->cell_identity); |
| 99 | if (!resp) { |
| 100 | LOGP(DMSC, LOGL_DEBUG, "Failed to create layer3 message.\n"); |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 101 | bsc_delete_connection(conn->sccp_con); |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 102 | return BSC_API_CONN_POL_REJECT; |
Holger Hans Peter Freyther | 5bb874d | 2010-11-05 11:21:18 +0100 | [diff] [blame] | 103 | } |
| 104 | |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 105 | if (bsc_open_connection(conn->sccp_con, resp) != 0) { |
| 106 | bsc_delete_connection(conn->sccp_con); |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 107 | msgb_free(resp); |
| 108 | return BSC_API_CONN_POL_REJECT; |
| 109 | } |
| 110 | |
| 111 | return BSC_API_CONN_POL_ACCEPT; |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 112 | } |
| 113 | |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 114 | static void bsc_dtap(struct gsm_subscriber_connection *conn, uint8_t link_id, struct msgb *msg) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 115 | { |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 116 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 117 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 118 | |
Holger Hans Peter Freyther | 5bb874d | 2010-11-05 11:21:18 +0100 | [diff] [blame] | 119 | bsc_scan_bts_msg(conn, msg); |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 120 | resp = gsm0808_create_dtap(msg, link_id); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 121 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 122 | } |
| 123 | |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 124 | static void bsc_assign_compl(struct gsm_subscriber_connection *conn, uint8_t rr_cause, |
| 125 | uint8_t chosen_channel, uint8_t encr_alg_id, |
| 126 | uint8_t speech_model) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 127 | { |
Holger Hans Peter Freyther | da488ae | 2010-11-04 12:09:45 +0100 | [diff] [blame] | 128 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 129 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | da488ae | 2010-11-04 12:09:45 +0100 | [diff] [blame] | 130 | |
| 131 | resp = gsm0808_create_assignment_completed(rr_cause, chosen_channel, |
| 132 | encr_alg_id, speech_model); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 133 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 134 | } |
| 135 | |
Holger Hans Peter Freyther | 45b575f | 2010-11-05 10:37:17 +0100 | [diff] [blame] | 136 | static void bsc_assign_fail(struct gsm_subscriber_connection *conn, |
| 137 | uint8_t cause, uint8_t *rr_cause) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 138 | { |
Holger Hans Peter Freyther | e46f1d6 | 2010-11-05 10:59:45 +0100 | [diff] [blame] | 139 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 140 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | e46f1d6 | 2010-11-05 10:59:45 +0100 | [diff] [blame] | 141 | |
| 142 | resp = gsm0808_create_assignment_failure(cause, rr_cause); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 143 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 144 | } |
| 145 | |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 146 | static int bsc_clear_request(struct gsm_subscriber_connection *conn, uint32_t cause) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 147 | { |
Holger Hans Peter Freyther | c2b3270 | 2010-11-04 12:47:06 +0100 | [diff] [blame] | 148 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 149 | return_when_not_connected_val(conn, 1); |
Holger Hans Peter Freyther | c2b3270 | 2010-11-04 12:47:06 +0100 | [diff] [blame] | 150 | |
| 151 | resp = gsm0808_create_clear_rqst(GSM0808_CAUSE_RADIO_INTERFACE_FAILURE); |
| 152 | if (!resp) { |
| 153 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); |
| 154 | return 0; |
| 155 | } |
| 156 | |
Holger Hans Peter Freyther | 863a55d | 2010-11-10 09:31:41 +0100 | [diff] [blame] | 157 | bsc_queue_for_msc(conn->sccp_con, resp); |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 158 | return 0; |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 159 | } |
| 160 | |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 161 | static struct bsc_api bsc_handler = { |
| 162 | .sapi_n_reject = bsc_sapi_n_reject, |
| 163 | .cipher_mode_compl = bsc_cipher_mode_compl, |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 164 | .compl_l3 = bsc_compl_l3, |
| 165 | .dtap = bsc_dtap, |
| 166 | .assign_compl = bsc_assign_compl, |
| 167 | .assign_fail = bsc_assign_fail, |
| 168 | .clear_request = bsc_clear_request, |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 169 | }; |
| 170 | |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 171 | struct bsc_api *osmo_bsc_api() |
| 172 | { |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 173 | return &bsc_handler; |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 174 | } |