| /* GSM 08.08 BSSMAP handling */ |
| /* (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 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/osmo_bsc.h> |
| #include <openbsc/osmo_bsc_grace.h> |
| #include <openbsc/debug.h> |
| |
| #include <osmocore/gsm0808.h> |
| #include <osmocore/protocol/gsm_08_08.h> |
| |
| #include <arpa/inet.h> |
| |
| static uint16_t read_data16(const uint8_t *data) |
| { |
| uint16_t res; |
| |
| memcpy(&res, data, sizeof(res)); |
| return res; |
| } |
| |
| static int bssmap_handle_reset_ack(struct gsm_network *net, |
| struct msgb *msg, unsigned int length) |
| { |
| LOGP(DMSC, LOGL_NOTICE, "Reset ACK from MSC\n"); |
| return 0; |
| } |
| |
| /* GSM 08.08 ยง 3.2.1.19 */ |
| static int bssmap_handle_paging(struct gsm_network *net, |
| struct msgb *msg, unsigned int payload_length) |
| { |
| struct tlv_parsed tp; |
| char mi_string[GSM48_MI_SIZE]; |
| uint32_t tmsi = GSM_RESERVED_TMSI; |
| unsigned int lac = GSM_LAC_RESERVED_ALL_BTS; |
| uint8_t data_length; |
| const uint8_t *data; |
| uint8_t chan_needed = RSL_CHANNEED_ANY; |
| |
| tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l4h + 1, payload_length - 1, 0, 0); |
| |
| if (!TLVP_PRESENT(&tp, GSM0808_IE_IMSI)) { |
| LOGP(DMSC, LOGL_ERROR, "Mandantory IMSI not present.\n"); |
| return -1; |
| } else if ((TLVP_VAL(&tp, GSM0808_IE_IMSI)[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) { |
| LOGP(DMSC, LOGL_ERROR, "Wrong content in the IMSI\n"); |
| return -1; |
| } |
| |
| if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST)) { |
| LOGP(DMSC, LOGL_ERROR, "Mandantory CELL IDENTIFIER LIST not present.\n"); |
| return -1; |
| } |
| |
| if (TLVP_PRESENT(&tp, GSM0808_IE_TMSI)) { |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), |
| TLVP_VAL(&tp, GSM0808_IE_TMSI), TLVP_LEN(&tp, GSM0808_IE_TMSI)); |
| tmsi = strtoul(mi_string, NULL, 10); |
| } |
| |
| |
| /* |
| * parse the IMSI |
| */ |
| gsm48_mi_to_string(mi_string, sizeof(mi_string), |
| TLVP_VAL(&tp, GSM0808_IE_IMSI), TLVP_LEN(&tp, GSM0808_IE_IMSI)); |
| |
| /* |
| * parse the cell identifier list |
| */ |
| data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER_LIST); |
| |
| /* |
| * Support paging to all network or one BTS at one LAC |
| */ |
| if (data_length == 3 && data[0] == CELL_IDENT_LAC) { |
| lac = ntohs(read_data16(&data[1])); |
| } else if (data_length > 1 || (data[0] & 0x0f) != CELL_IDENT_BSS) { |
| LOGP(DMSC, LOGL_ERROR, "Unsupported Cell Identifier List: %s\n", hexdump(data, data_length)); |
| return -1; |
| } |
| |
| if (TLVP_PRESENT(&tp, GSM0808_IE_CHANNEL_NEEDED) && TLVP_LEN(&tp, GSM0808_IE_CHANNEL_NEEDED) == 1) |
| chan_needed = TLVP_VAL(&tp, GSM0808_IE_CHANNEL_NEEDED)[0] & 0x03; |
| |
| if (TLVP_PRESENT(&tp, GSM0808_IE_EMLPP_PRIORITY)) { |
| LOGP(DMSC, LOGL_ERROR, "eMLPP is not handled\n"); |
| } |
| |
| LOGP(DMSC, LOGL_DEBUG, "Paging request from MSC IMSI: '%s' TMSI: '0x%x/%u' LAC: 0x%x\n", mi_string, tmsi, tmsi, lac); |
| LOGP(DMSC, LOGL_ERROR, "Paging is not implemented...\n"); |
| return -1; |
| } |
| |
| static int bssmap_rcvmsg_udt(struct gsm_network *net, |
| struct msgb *msg, unsigned int length) |
| { |
| int ret = 0; |
| |
| if (length < 1) { |
| LOGP(DMSC, LOGL_ERROR, "Not enough room: %d\n", length); |
| return -1; |
| } |
| |
| switch (msg->l4h[0]) { |
| case BSS_MAP_MSG_RESET_ACKNOWLEDGE: |
| ret = bssmap_handle_reset_ack(net, msg, length); |
| break; |
| case BSS_MAP_MSG_PAGING: |
| if (bsc_grace_allow_new_connection(net)) |
| ret = bssmap_handle_paging(net, msg, length); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static int bssmap_rcvmsg_dt1(struct osmo_bsc_sccp_con *conn, |
| struct msgb *msg, unsigned int length) |
| { |
| return -1; |
| } |
| |
| static int dtap_rcvmsg(struct osmo_bsc_sccp_con *conn, |
| struct msgb *msg, unsigned int length) |
| { |
| return -1; |
| } |
| |
| int bsc_handle_udt(struct gsm_network *network, |
| struct bsc_msc_connection *conn, |
| struct msgb *msgb, unsigned int length) |
| { |
| struct bssmap_header *bs; |
| |
| LOGP(DMSC, LOGL_DEBUG, "Incoming SCCP message ftom MSC: %s\n", |
| 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(network, msgb, length - sizeof(*bs)); |
| break; |
| default: |
| LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %d\n", 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_DEBUG, "Unimplemented msg type: %d\n", msg->l3h[0]); |
| } |
| |
| return -1; |
| } |