| /* (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2010 by On-Waves |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <openbsc/osmo_bsc.h> |
| #include <openbsc/osmo_msc_data.h> |
| #include <openbsc/gsm_04_80.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/paging.h> |
| |
| #include <stdlib.h> |
| |
| static void handle_lu_request(struct gsm_subscriber_connection *conn, |
| struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| struct gsm48_loc_upd_req *lu; |
| struct gsm48_loc_area_id lai; |
| struct gsm_network *net; |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*lu)) { |
| LOGP(DMSC, LOGL_ERROR, "LU too small to look at: %u\n", msgb_l3len(msg)); |
| return; |
| } |
| |
| net = conn->bts->network; |
| |
| gh = msgb_l3(msg); |
| lu = (struct gsm48_loc_upd_req *) gh->data; |
| |
| gsm48_generate_lai(&lai, net->country_code, net->network_code, |
| conn->bts->location_area_code); |
| |
| if (memcmp(&lai, &lu->lai, sizeof(lai)) != 0) { |
| LOGP(DMSC, LOGL_DEBUG, "Marking con for welcome USSD.\n"); |
| conn->sccp_con->new_subscriber = 1; |
| } |
| } |
| |
| /* we will need to stop the paging request */ |
| static int handle_page_resp(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| { |
| uint8_t mi_type; |
| char mi_string[GSM48_MI_SIZE]; |
| struct gsm48_hdr *gh; |
| struct gsm48_pag_resp *resp; |
| struct gsm_subscriber *subscr; |
| |
| if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*resp)) { |
| LOGP(DMSC, LOGL_ERROR, "PagingResponse too small: %u\n", msgb_l3len(msg)); |
| return -1; |
| } |
| |
| gh = msgb_l3(msg); |
| resp = (struct gsm48_pag_resp *) &gh->data[0]; |
| |
| gsm48_paging_extract_mi(resp, msgb_l3len(msg) - sizeof(*gh), |
| mi_string, &mi_type); |
| DEBUGP(DRR, "PAGING RESPONSE: mi_type=0x%02x MI(%s)\n", |
| mi_type, mi_string); |
| |
| switch (mi_type) { |
| case GSM_MI_TYPE_TMSI: |
| subscr = subscr_active_by_tmsi(conn->bts->network, |
| tmsi_from_string(mi_string)); |
| break; |
| case GSM_MI_TYPE_IMSI: |
| subscr = subscr_active_by_imsi(conn->bts->network, mi_string); |
| break; |
| default: |
| subscr = NULL; |
| break; |
| } |
| |
| if (!subscr) { |
| LOGP(DMSC, LOGL_ERROR, "Non active subscriber got paged.\n"); |
| return -1; |
| } |
| |
| paging_request_stop(conn->bts, subscr, conn, msg); |
| subscr_put(subscr); |
| return 0; |
| } |
| |
| /** |
| * This is used to scan a message for extra functionality of the BSC. This |
| * includes scanning for location updating requests/acceptd and then send |
| * a welcome USSD message to the subscriber. |
| */ |
| int bsc_scan_bts_msg(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| { |
| struct gsm48_hdr *gh = msgb_l3(msg); |
| uint8_t pdisc = gh->proto_discr & 0x0f; |
| uint8_t mtype = gh->msg_type & 0xbf; |
| |
| if (pdisc == GSM48_PDISC_MM) { |
| if (mtype == GSM48_MT_MM_LOC_UPD_REQUEST) |
| handle_lu_request(conn, msg); |
| } else if (pdisc == GSM48_PDISC_RR) { |
| if (mtype == GSM48_MT_RR_PAG_RESP) |
| handle_page_resp(conn, msg); |
| } |
| |
| return 0; |
| } |
| |
| static void send_welcome_ussd(struct gsm_subscriber_connection *conn) |
| { |
| struct gsm_network *net; |
| net = conn->bts->network; |
| |
| if (!net->msc_data->ussd_welcome_txt) |
| return; |
| |
| gsm0480_send_ussdNotify(conn, 1, net->msc_data->ussd_welcome_txt); |
| gsm0480_send_releaseComplete(conn); |
| } |
| |
| /** |
| * Messages coming back from the MSC. |
| */ |
| int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| { |
| struct gsm_network *net; |
| struct gsm48_loc_area_id *lai; |
| struct gsm48_hdr *gh; |
| uint8_t mtype; |
| |
| if (msgb_l3len(msg) < sizeof(*gh)) { |
| LOGP(DMSC, LOGL_ERROR, "GSM48 header does not fit.\n"); |
| return -1; |
| } |
| |
| gh = (struct gsm48_hdr *) msgb_l3(msg); |
| mtype = gh->msg_type & 0xbf; |
| net = conn->bts->network; |
| |
| if (mtype == GSM48_MT_MM_LOC_UPD_ACCEPT) { |
| if (net->msc_data->core_ncc != -1 || |
| net->msc_data->core_mcc != -1) { |
| if (msgb_l3len(msg) >= sizeof(*gh) + sizeof(*lai)) { |
| lai = (struct gsm48_loc_area_id *) &gh->data[0]; |
| gsm48_generate_lai(lai, net->country_code, |
| net->network_code, |
| conn->bts->location_area_code); |
| } |
| } |
| |
| if (conn->sccp_con->new_subscriber) |
| send_welcome_ussd(conn); |
| } |
| |
| return 0; |
| } |