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 |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 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 |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <openbsc/osmo_bsc.h> |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 22 | #include <openbsc/osmo_msc_data.h> |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 23 | #include <openbsc/debug.h> |
| 24 | |
Holger Hans Peter Freyther | c2b3270 | 2010-11-04 12:47:06 +0100 | [diff] [blame] | 25 | #include <osmocore/protocol/gsm_08_08.h> |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 26 | #include <osmocore/gsm0808.h> |
| 27 | |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 28 | #define return_when_not_connected(conn) \ |
| 29 | if (!conn->sccp_con) {\ |
| 30 | LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \ |
| 31 | return; \ |
| 32 | } |
| 33 | |
| 34 | #define return_when_not_connected_val(conn, ret) \ |
| 35 | if (!conn->sccp_con) {\ |
| 36 | LOGP(DMSC, LOGL_ERROR, "MSC Connection not present.\n"); \ |
| 37 | return ret; \ |
| 38 | } |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 39 | |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 40 | #define queue_msg_or_return(resp) \ |
| 41 | if (!resp) { \ |
| 42 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); \ |
| 43 | return; \ |
| 44 | } \ |
| 45 | bsc_queue_for_msc(conn, resp); |
| 46 | |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 47 | static uint16_t get_network_code_for_msc(struct gsm_network *net) |
| 48 | { |
| 49 | if (net->msc_data->core_ncc != -1) |
| 50 | return net->msc_data->core_ncc; |
| 51 | return net->network_code; |
| 52 | } |
| 53 | |
| 54 | static uint16_t get_country_code_for_msc(struct gsm_network *net) |
| 55 | { |
| 56 | if (net->msc_data->core_mcc != -1) |
| 57 | return net->msc_data->core_mcc; |
| 58 | return net->country_code; |
| 59 | } |
| 60 | |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 61 | static void bsc_sapi_n_reject(struct gsm_subscriber_connection *conn, int dlci) |
| 62 | { |
Holger Hans Peter Freyther | c8166f3 | 2010-11-04 12:28:32 +0100 | [diff] [blame] | 63 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 64 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | c8166f3 | 2010-11-04 12:28:32 +0100 | [diff] [blame] | 65 | |
| 66 | resp = gsm0808_create_sapi_reject(dlci); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 67 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | static void bsc_cipher_mode_compl(struct gsm_subscriber_connection *conn, |
| 71 | struct msgb *msg, uint8_t chosen_encr) |
| 72 | { |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 73 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 74 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | 2d2c910 | 2010-11-04 11:59:41 +0100 | [diff] [blame] | 75 | |
| 76 | LOGP(DMSC, LOGL_DEBUG, "CIPHER MODE COMPLETE from MS, forwarding to MSC\n"); |
| 77 | resp = gsm0808_create_cipher_complete(msg, chosen_encr); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 78 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 79 | } |
| 80 | |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 81 | /* |
| 82 | * Instruct to reserve data for a new connectiom, create the complete |
| 83 | * layer three message, send it to open the connection. |
| 84 | */ |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 85 | static int bsc_compl_l3(struct gsm_subscriber_connection *conn, struct msgb *msg, |
| 86 | uint16_t chosen_channel) |
| 87 | { |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 88 | struct msgb *resp; |
| 89 | uint16_t network_code = get_network_code_for_msc(conn->bts->network); |
| 90 | uint16_t country_code = get_country_code_for_msc(conn->bts->network); |
| 91 | |
| 92 | /* allocate resource for a new connection */ |
| 93 | if (bsc_create_new_connection(conn) != 0) |
| 94 | return BSC_API_CONN_POL_REJECT; |
| 95 | |
| 96 | bsc_scan_bts_msg(conn, msg); |
| 97 | resp = gsm0808_create_layer3(msg, network_code, country_code, |
| 98 | conn->bts->location_area_code, |
| 99 | conn->bts->cell_identity); |
| 100 | if (!resp) { |
| 101 | LOGP(DMSC, LOGL_DEBUG, "Failed to create layer3 message.\n"); |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 102 | bsc_delete_connection(conn->sccp_con); |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 103 | return BSC_API_CONN_POL_REJECT; |
Holger Hans Peter Freyther | 5bb874d | 2010-11-05 11:21:18 +0100 | [diff] [blame] | 104 | } |
| 105 | |
Holger Hans Peter Freyther | 7e90108 | 2010-11-06 20:15:17 +0100 | [diff] [blame] | 106 | if (bsc_open_connection(conn->sccp_con, resp) != 0) { |
| 107 | bsc_delete_connection(conn->sccp_con); |
Holger Hans Peter Freyther | 9b17c76 | 2010-11-05 19:48:47 +0100 | [diff] [blame] | 108 | msgb_free(resp); |
| 109 | return BSC_API_CONN_POL_REJECT; |
| 110 | } |
| 111 | |
| 112 | return BSC_API_CONN_POL_ACCEPT; |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 113 | } |
| 114 | |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 115 | 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] | 116 | { |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 117 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 118 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 119 | |
Holger Hans Peter Freyther | 5bb874d | 2010-11-05 11:21:18 +0100 | [diff] [blame] | 120 | bsc_scan_bts_msg(conn, msg); |
Holger Hans Peter Freyther | 58f2cf6 | 2010-11-04 12:24:05 +0100 | [diff] [blame] | 121 | resp = gsm0808_create_dtap(msg, link_id); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 122 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 123 | } |
| 124 | |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 125 | static void bsc_assign_compl(struct gsm_subscriber_connection *conn, uint8_t rr_cause, |
| 126 | uint8_t chosen_channel, uint8_t encr_alg_id, |
| 127 | uint8_t speech_model) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 128 | { |
Holger Hans Peter Freyther | da488ae | 2010-11-04 12:09:45 +0100 | [diff] [blame] | 129 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 130 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | da488ae | 2010-11-04 12:09:45 +0100 | [diff] [blame] | 131 | |
| 132 | resp = gsm0808_create_assignment_completed(rr_cause, chosen_channel, |
| 133 | encr_alg_id, speech_model); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 134 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 135 | } |
| 136 | |
Holger Hans Peter Freyther | 45b575f | 2010-11-05 10:37:17 +0100 | [diff] [blame] | 137 | static void bsc_assign_fail(struct gsm_subscriber_connection *conn, |
| 138 | uint8_t cause, uint8_t *rr_cause) |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 139 | { |
Holger Hans Peter Freyther | e46f1d6 | 2010-11-05 10:59:45 +0100 | [diff] [blame] | 140 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 141 | return_when_not_connected(conn); |
Holger Hans Peter Freyther | e46f1d6 | 2010-11-05 10:59:45 +0100 | [diff] [blame] | 142 | |
| 143 | resp = gsm0808_create_assignment_failure(cause, rr_cause); |
Holger Hans Peter Freyther | 46c5ab3 | 2010-11-05 11:02:28 +0100 | [diff] [blame] | 144 | queue_msg_or_return(resp); |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 145 | } |
| 146 | |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 147 | 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] | 148 | { |
Holger Hans Peter Freyther | c2b3270 | 2010-11-04 12:47:06 +0100 | [diff] [blame] | 149 | struct msgb *resp; |
Holger Hans Peter Freyther | 7225fd1 | 2010-11-03 19:03:35 +0100 | [diff] [blame] | 150 | return_when_not_connected_val(conn, 1); |
Holger Hans Peter Freyther | c2b3270 | 2010-11-04 12:47:06 +0100 | [diff] [blame] | 151 | |
| 152 | resp = gsm0808_create_clear_rqst(GSM0808_CAUSE_RADIO_INTERFACE_FAILURE); |
| 153 | if (!resp) { |
| 154 | LOGP(DMSC, LOGL_ERROR, "Failed to allocate response.\n"); |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | bsc_queue_for_msc(conn, resp); |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 159 | return 0; |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 160 | } |
| 161 | |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 162 | static struct bsc_api bsc_handler = { |
| 163 | .sapi_n_reject = bsc_sapi_n_reject, |
| 164 | .cipher_mode_compl = bsc_cipher_mode_compl, |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 165 | .compl_l3 = bsc_compl_l3, |
| 166 | .dtap = bsc_dtap, |
| 167 | .assign_compl = bsc_assign_compl, |
| 168 | .assign_fail = bsc_assign_fail, |
| 169 | .clear_request = bsc_clear_request, |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 170 | }; |
| 171 | |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 172 | struct bsc_api *osmo_bsc_api() |
| 173 | { |
Holger Hans Peter Freyther | 32aaef6 | 2010-09-16 17:26:35 +0800 | [diff] [blame] | 174 | return &bsc_handler; |
Holger Hans Peter Freyther | 4f448c9 | 2010-07-05 16:02:04 +0800 | [diff] [blame] | 175 | } |