546 lines
15 KiB
C
546 lines
15 KiB
C
/* GSM 08.08 BSSMAP handling */
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/* (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2012 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <openbsc/osmo_bsc.h>
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#include <openbsc/osmo_bsc_grace.h>
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#include <openbsc/bsc_msc_data.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/mgcp.h>
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#include <openbsc/paging.h>
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#include <osmocom/gsm/protocol/gsm_08_08.h>
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#include <osmocom/gsm/gsm0808.h>
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/*
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* helpers for the assignment command
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*/
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enum gsm0808_permitted_speech audio_support_to_gsm88(struct gsm_audio_support *audio)
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{
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if (audio->hr) {
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switch (audio->ver) {
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case 1:
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return GSM0808_PERM_HR1;
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break;
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case 2:
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return GSM0808_PERM_HR2;
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break;
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case 3:
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return GSM0808_PERM_HR3;
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break;
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default:
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LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", audio->ver);
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return GSM0808_PERM_FR1;
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}
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} else {
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switch (audio->ver) {
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case 1:
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return GSM0808_PERM_FR1;
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break;
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case 2:
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return GSM0808_PERM_FR2;
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break;
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case 3:
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return GSM0808_PERM_FR3;
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break;
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default:
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LOGP(DMSC, LOGL_ERROR, "Wrong speech mode: %d\n", audio->ver);
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return GSM0808_PERM_HR1;
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}
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}
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}
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enum gsm48_chan_mode gsm88_to_chan_mode(enum gsm0808_permitted_speech speech)
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{
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switch (speech) {
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case GSM0808_PERM_HR1:
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case GSM0808_PERM_FR1:
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return GSM48_CMODE_SPEECH_V1;
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break;
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case GSM0808_PERM_HR2:
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case GSM0808_PERM_FR2:
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return GSM48_CMODE_SPEECH_EFR;
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break;
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case GSM0808_PERM_HR3:
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case GSM0808_PERM_FR3:
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return GSM48_CMODE_SPEECH_AMR;
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break;
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}
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LOGP(DMSC, LOGL_FATAL, "Should not be reached.\n");
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return GSM48_CMODE_SPEECH_AMR;
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}
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static int bssmap_handle_reset_ack(struct bsc_msc_data *msc,
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struct msgb *msg, unsigned int length)
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{
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LOGP(DMSC, LOGL_NOTICE, "Reset ACK from MSC\n");
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return 0;
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}
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/* GSM 08.08 § 3.2.1.19 */
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static int bssmap_handle_paging(struct bsc_msc_data *msc,
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struct msgb *msg, unsigned int payload_length)
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{
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struct gsm_subscriber *subscr;
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struct tlv_parsed tp;
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char mi_string[GSM48_MI_SIZE];
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uint32_t tmsi = GSM_RESERVED_TMSI;
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unsigned int lac = GSM_LAC_RESERVED_ALL_BTS;
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uint8_t data_length;
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const uint8_t *data;
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uint8_t chan_needed = RSL_CHANNEED_ANY;
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tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0);
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if (!TLVP_PRESENT(&tp, GSM0808_IE_IMSI)) {
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LOGP(DMSC, LOGL_ERROR, "Mandatory IMSI not present.\n");
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return -1;
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} else if ((TLVP_VAL(&tp, GSM0808_IE_IMSI)[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) {
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LOGP(DMSC, LOGL_ERROR, "Wrong content in the IMSI\n");
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return -1;
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}
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if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) {
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LOGP(DMSC, LOGL_ERROR, "Mandatory CELL IDENTIFIER LIST not present.\n");
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return -1;
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}
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if (TLVP_PRESENT(&tp, GSM0808_IE_TMSI) &&
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TLVP_LEN(&tp, GSM0808_IE_TMSI) == 4) {
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tmsi = ntohl(tlvp_val32_unal(&tp, GSM0808_IE_TMSI));
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}
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/*
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* parse the IMSI
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*/
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gsm48_mi_to_string(mi_string, sizeof(mi_string),
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TLVP_VAL(&tp, GSM0808_IE_IMSI), TLVP_LEN(&tp, GSM0808_IE_IMSI));
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/*
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* parse the cell identifier list
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*/
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data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST);
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data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST);
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/*
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* Support paging to all network or one BTS at one LAC
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*/
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if (data_length == 3 && data[0] == CELL_IDENT_LAC) {
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lac = osmo_load16be(&data[1]);
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} else if (data_length > 1 || (data[0] & 0x0f) != CELL_IDENT_BSS) {
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LOGP(DMSC, LOGL_ERROR, "Unsupported Cell Identifier List: %s\n", osmo_hexdump(data, data_length));
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return -1;
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}
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if (TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_NEEDED) && TLVP_LEN(&tp, GSM0808_IE_CHANNEL_NEEDED) == 1)
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chan_needed = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_NEEDED)[0] & 0x03;
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if (TLVP_PRESENT(&tp, GSM0808_IE_EMLPP_PRIORITY)) {
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LOGP(DMSC, LOGL_ERROR, "eMLPP is not handled\n");
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}
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subscr = subscr_get_or_create(msc->network->subscr_group, mi_string);
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if (!subscr) {
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LOGP(DMSC, LOGL_ERROR, "Failed to allocate a subscriber for %s\n", mi_string);
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return -1;
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}
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subscr->lac = lac;
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subscr->tmsi = tmsi;
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LOGP(DMSC, LOGL_INFO, "Paging request from MSC IMSI: '%s' TMSI: '0x%x/%u' LAC: 0x%x\n", mi_string, tmsi, tmsi, lac);
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bsc_grace_paging_request(subscr, chan_needed, msc);
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return 0;
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}
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/*
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* GSM 08.08 § 3.1.9.1 and 3.2.1.21...
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* release our gsm_subscriber_connection and send message
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*/
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static int bssmap_handle_clear_command(struct osmo_bsc_sccp_con *conn,
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struct msgb *msg, unsigned int payload_length)
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{
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struct msgb *resp;
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/* TODO: handle the cause of this package */
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if (conn->conn) {
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LOGP(DMSC, LOGL_INFO, "Releasing all transactions on %p\n", conn);
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gsm0808_clear(conn->conn);
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bsc_subscr_con_free(conn->conn);
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conn->conn = NULL;
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}
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/* send the clear complete message */
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resp = gsm0808_create_clear_complete();
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if (!resp) {
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LOGP(DMSC, LOGL_ERROR, "Sending clear complete failed.\n");
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return -1;
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}
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bsc_queue_for_msc(conn, resp);
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return 0;
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}
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/*
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* GSM 08.08 § 3.4.7 cipher mode handling. We will have to pick
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* the cipher to be used for this. In case we are already using
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* a cipher we will have to send cipher mode reject to the MSC,
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* otherwise we will have to pick something that we and the MS
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* is supporting. Currently we are doing it in a rather static
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* way by picking one ecnryption or no encrytpion.
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*/
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static int bssmap_handle_cipher_mode(struct osmo_bsc_sccp_con *conn,
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struct msgb *msg, unsigned int payload_length)
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{
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uint16_t len;
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struct gsm_network *network = NULL;
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const uint8_t *data;
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struct tlv_parsed tp;
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struct msgb *resp;
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int reject_cause = -1;
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int include_imeisv = 1;
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if (!conn->conn) {
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LOGP(DMSC, LOGL_ERROR, "No lchan/msc_data in cipher mode command.\n");
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goto reject;
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}
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if (conn->ciphering_handled) {
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LOGP(DMSC, LOGL_ERROR, "Already seen ciphering command. Protocol Error.\n");
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goto reject;
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}
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conn->ciphering_handled = 1;
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tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0);
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if (!TLVP_PRESENT(&tp, GSM0808_IE_ENCRYPTION_INFORMATION)) {
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LOGP(DMSC, LOGL_ERROR, "IE Encryption Information missing.\n");
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goto reject;
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}
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/*
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* check if our global setting is allowed
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* - Currently we check for A5/0 and A5/1
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* - Copy the key if that is necessary
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* - Otherwise reject
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*/
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len = TLVP_LEN(&tp, GSM0808_IE_ENCRYPTION_INFORMATION);
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if (len < 1) {
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LOGP(DMSC, LOGL_ERROR, "IE Encryption Information is too short.\n");
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goto reject;
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}
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network = conn->conn->bts->network;
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data = TLVP_VAL(&tp, GSM0808_IE_ENCRYPTION_INFORMATION);
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if (TLVP_PRESENT(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE))
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include_imeisv = TLVP_VAL(&tp, GSM0808_IE_CIPHER_RESPONSE_MODE)[0] & 0x1;
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if (network->a5_encryption == 0 && (data[0] & 0x1) == 0x1) {
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gsm0808_cipher_mode(conn->conn, 0, NULL, 0, include_imeisv);
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} else if (network->a5_encryption != 0 && (data[0] & 0x2) == 0x2) {
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gsm0808_cipher_mode(conn->conn, 1, &data[1], len - 1, include_imeisv);
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} else {
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LOGP(DMSC, LOGL_ERROR, "Can not select encryption...\n");
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goto reject;
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}
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return 0;
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reject:
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resp = gsm0808_create_cipher_reject(reject_cause);
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if (!resp) {
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LOGP(DMSC, LOGL_ERROR, "Sending the cipher reject failed.\n");
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return -1;
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}
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bsc_queue_for_msc(conn, resp);
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return -1;
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}
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/*
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* Handle the assignment request message.
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*
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* See §3.2.1.1 for the message type
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*/
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static int bssmap_handle_assignm_req(struct osmo_bsc_sccp_con *conn,
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struct msgb *msg, unsigned int length)
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{
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struct msgb *resp;
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struct bsc_msc_data *msc;
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struct tlv_parsed tp;
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uint8_t *data;
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uint8_t timeslot;
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uint8_t multiplex;
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enum gsm48_chan_mode chan_mode = GSM48_CMODE_SIGN;
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int i, supported, port, full_rate = -1;
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if (!conn->conn) {
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LOGP(DMSC, LOGL_ERROR, "No lchan/msc_data in cipher mode command.\n");
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return -1;
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}
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tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, length - 1, 0, 0);
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if (!TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_TYPE)) {
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LOGP(DMSC, LOGL_ERROR, "Mandatory channel type not present.\n");
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goto reject;
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}
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if (!TLVP_PRESENT(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE)) {
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LOGP(DMSC, LOGL_ERROR, "Identity code missing. Audio routing will not work.\n");
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goto reject;
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}
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conn->cic = osmo_load16be(TLVP_VAL(&tp, GSM0808_IE_CIRCUIT_IDENTITY_CODE));
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timeslot = conn->cic & 0x1f;
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multiplex = (conn->cic & ~0x1f) >> 5;
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/*
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* Currently we only support a limited subset of all
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* possible channel types. The limitation ends by not using
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* multi-slot, limiting the channel coding, speech...
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*/
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if (TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE) < 3) {
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LOGP(DMSC, LOGL_ERROR, "ChannelType len !=3 not supported: %d\n",
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TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE));
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goto reject;
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}
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/*
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* Try to figure out if we support the proposed speech codecs. For
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* now we will always pick the full rate codecs.
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*/
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data = (uint8_t *) TLVP_VAL(&tp, GSM0808_IE_CHANNEL_TYPE);
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if ((data[0] & 0xf) != 0x1) {
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LOGP(DMSC, LOGL_ERROR, "ChannelType != speech: %d\n", data[0]);
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goto reject;
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}
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/*
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* go through the list of preferred codecs of our gsm network
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* and try to find it among the permitted codecs. If we found
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* it we will send chan_mode to the right mode and break the
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* inner loop. The outer loop will exit due chan_mode having
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* the correct value.
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*/
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full_rate = 0;
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msc = conn->msc;
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for (supported = 0;
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chan_mode == GSM48_CMODE_SIGN && supported < msc->audio_length;
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++supported) {
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int perm_val = audio_support_to_gsm88(msc->audio_support[supported]);
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for (i = 2; i < TLVP_LEN(&tp, GSM0808_IE_CHANNEL_TYPE); ++i) {
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if ((data[i] & 0x7f) == perm_val) {
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chan_mode = gsm88_to_chan_mode(perm_val);
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full_rate = (data[i] & 0x4) == 0;
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break;
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} else if ((data[i] & 0x80) == 0x00) {
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break;
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}
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}
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}
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if (chan_mode == GSM48_CMODE_SIGN) {
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LOGP(DMSC, LOGL_ERROR, "No supported audio type found.\n");
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goto reject;
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}
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/* map it to a MGCP Endpoint and a RTP port */
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port = mgcp_timeslot_to_endpoint(multiplex, timeslot);
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conn->rtp_port = rtp_calculate_port(port, msc->rtp_base);
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return gsm0808_assign_req(conn->conn, chan_mode, full_rate);
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reject:
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resp = gsm0808_create_assignment_failure(GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL);
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if (!resp) {
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LOGP(DMSC, LOGL_ERROR, "Channel allocation failure.\n");
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return -1;
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}
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bsc_queue_for_msc(conn, resp);
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return -1;
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}
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static int bssmap_rcvmsg_udt(struct bsc_msc_data *msc,
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struct msgb *msg, unsigned int length)
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{
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int ret = 0;
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if (length < 1) {
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LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length);
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return -1;
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}
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LOGP(DMSC, LOGL_INFO, "Rx MSC UDT BSSMAP %s\n",
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gsm0808_bssmap_name(msg->l4h[0]));
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switch (msg->l4h[0]) {
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case BSS_MAP_MSG_RESET_ACKNOWLEDGE:
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ret = bssmap_handle_reset_ack(msc, msg, length);
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break;
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case BSS_MAP_MSG_PAGING:
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ret = bssmap_handle_paging(msc, msg, length);
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break;
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}
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return ret;
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}
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static int bssmap_rcvmsg_dt1(struct osmo_bsc_sccp_con *conn,
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struct msgb *msg, unsigned int length)
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{
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int ret = 0;
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if (length < 1) {
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LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length);
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return -1;
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}
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LOGP(DMSC, LOGL_INFO, "Rx MSC DT1 BSSMAP %s\n",
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gsm0808_bssmap_name(msg->l4h[0]));
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switch (msg->l4h[0]) {
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case BSS_MAP_MSG_CLEAR_CMD:
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ret = bssmap_handle_clear_command(conn, msg, length);
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break;
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case BSS_MAP_MSG_CIPHER_MODE_CMD:
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ret = bssmap_handle_cipher_mode(conn, msg, length);
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break;
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case BSS_MAP_MSG_ASSIGMENT_RQST:
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ret = bssmap_handle_assignm_req(conn, msg, length);
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break;
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default:
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LOGP(DMSC, LOGL_NOTICE, "Unimplemented msg type: %s\n",
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gsm0808_bssmap_name(msg->l4h[0]));
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break;
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}
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return ret;
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}
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static int dtap_rcvmsg(struct osmo_bsc_sccp_con *conn,
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struct msgb *msg, unsigned int length)
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{
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struct dtap_header *header;
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struct msgb *gsm48;
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uint8_t *data;
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int rc, dtap_rc;
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LOGP(DMSC, LOGL_DEBUG, "Rx MSC DTAP: %s\n",
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osmo_hexdump(msg->l3h, length));
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if (!conn->conn) {
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LOGP(DMSC, LOGL_ERROR, "No subscriber connection available\n");
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return -1;
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}
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header = (struct dtap_header *) msg->l3h;
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if (sizeof(*header) >= length) {
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LOGP(DMSC, LOGL_ERROR, "The DTAP header does not fit. Wanted: %zu got: %u\n", sizeof(*header), length);
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LOGP(DMSC, LOGL_ERROR, "hex: %s\n", osmo_hexdump(msg->l3h, length));
|
|
return -1;
|
|
}
|
|
|
|
if (header->length > length - sizeof(*header)) {
|
|
LOGP(DMSC, LOGL_ERROR, "The DTAP l4 information does not fit: header: %u length: %u\n", header->length, length);
|
|
LOGP(DMSC, LOGL_ERROR, "hex: %s\n", osmo_hexdump(msg->l3h, length));
|
|
return -1;
|
|
}
|
|
|
|
LOGP(DMSC, LOGL_INFO, "Rx MSC DTAP, SAPI: %u CHAN: %u\n", header->link_id & 0x07, header->link_id & 0xC0);
|
|
|
|
/* forward the data */
|
|
gsm48 = gsm48_msgb_alloc_name("GSM 04.08 DTAP RCV");
|
|
if (!gsm48) {
|
|
LOGP(DMSC, LOGL_ERROR, "Allocation of the message failed.\n");
|
|
return -1;
|
|
}
|
|
|
|
gsm48->l3h = gsm48->data;
|
|
data = msgb_put(gsm48, length - sizeof(*header));
|
|
memcpy(data, msg->l3h + sizeof(*header), length - sizeof(*header));
|
|
|
|
/* pass it to the filter for extra actions */
|
|
rc = bsc_scan_msc_msg(conn->conn, gsm48);
|
|
dtap_rc = gsm0808_submit_dtap(conn->conn, gsm48, header->link_id, 1);
|
|
if (rc == BSS_SEND_USSD)
|
|
bsc_send_welcome_ussd(conn->conn);
|
|
return dtap_rc;
|
|
}
|
|
|
|
int bsc_handle_udt(struct bsc_msc_data *msc,
|
|
struct msgb *msgb, unsigned int length)
|
|
{
|
|
struct bssmap_header *bs;
|
|
|
|
LOGP(DMSC, LOGL_DEBUG, "Rx MSC UDT: %s\n",
|
|
osmo_hexdump(msgb->l3h, length));
|
|
|
|
if (length < sizeof(*bs)) {
|
|
LOGP(DMSC, LOGL_ERROR, "The header is too short.\n");
|
|
return -1;
|
|
}
|
|
|
|
bs = (struct bssmap_header *) msgb->l3h;
|
|
if (bs->length < length - sizeof(*bs))
|
|
return -1;
|
|
|
|
switch (bs->type) {
|
|
case BSSAP_MSG_BSS_MANAGEMENT:
|
|
msgb->l4h = &msgb->l3h[sizeof(*bs)];
|
|
bssmap_rcvmsg_udt(msc, msgb, length - sizeof(*bs));
|
|
break;
|
|
default:
|
|
LOGP(DMSC, LOGL_NOTICE, "Unimplemented msg type: %s\n",
|
|
gsm0808_bssmap_name(bs->type));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int bsc_handle_dt1(struct osmo_bsc_sccp_con *conn,
|
|
struct msgb *msg, unsigned int len)
|
|
{
|
|
if (len < sizeof(struct bssmap_header)) {
|
|
LOGP(DMSC, LOGL_ERROR, "The header is too short.\n");
|
|
}
|
|
|
|
switch (msg->l3h[0]) {
|
|
case BSSAP_MSG_BSS_MANAGEMENT:
|
|
msg->l4h = &msg->l3h[sizeof(struct bssmap_header)];
|
|
bssmap_rcvmsg_dt1(conn, msg, len - sizeof(struct bssmap_header));
|
|
break;
|
|
case BSSAP_MSG_DTAP:
|
|
dtap_rcvmsg(conn, msg, len);
|
|
break;
|
|
default:
|
|
LOGP(DMSC, LOGL_NOTICE, "Unimplemented BSSAP msg type: %s\n",
|
|
gsm0808_bssap_name(msg->l3h[0]));
|
|
}
|
|
|
|
return -1;
|
|
}
|