| /* |
| * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 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 General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <openbsc/bsc_nat.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/bssap.h> |
| #include <openbsc/debug.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| int bsc_mgcp_assign(struct sccp_connections *con, struct msgb *msg) |
| { |
| struct tlv_parsed tp; |
| u_int16_t cic; |
| u_int8_t timeslot; |
| u_int8_t multiplex; |
| |
| if (!msg->l3h) { |
| LOGP(DNAT, LOGL_ERROR, "Assignment message should have l3h pointer.\n"); |
| return -1; |
| } |
| |
| if (msgb_l3len(msg) < 3) { |
| LOGP(DNAT, LOGL_ERROR, "Assignment message has not enough space for GSM0808.\n"); |
| return -1; |
| } |
| |
| tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 3, msgb_l3len(msg) - 3, 0, 0); |
| if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) { |
| LOGP(DNAT, LOGL_ERROR, "Circuit identity code not found in assignment message.\n"); |
| return -1; |
| } |
| |
| cic = ntohs(*(u_int16_t *)TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)); |
| timeslot = cic & 0x1f; |
| multiplex = (cic & ~0x1f) >> 5; |
| |
| con->msc_timeslot = (32 * multiplex) + timeslot; |
| con->bsc_timeslot = con->msc_timeslot; |
| return 0; |
| } |
| |
| void bsc_mgcp_clear(struct sccp_connections *con) |
| { |
| con->msc_timeslot = -1; |
| con->bsc_timeslot = -1; |
| } |