diff options
Diffstat (limited to 'src/osmo-bsc/osmo_bsc_filter.c')
-rw-r--r-- | src/osmo-bsc/osmo_bsc_filter.c | 381 |
1 files changed, 0 insertions, 381 deletions
diff --git a/src/osmo-bsc/osmo_bsc_filter.c b/src/osmo-bsc/osmo_bsc_filter.c deleted file mode 100644 index 2c84b169f..000000000 --- a/src/osmo-bsc/osmo_bsc_filter.c +++ /dev/null @@ -1,381 +0,0 @@ -/* (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org> - * (C) 2009-2011 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/bsc_msc_data.h> -#include <openbsc/gsm_04_80.h> -#include <openbsc/gsm_subscriber.h> -#include <openbsc/bsc_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; - } -} - -/* extract a subscriber from the paging response */ -static struct bsc_subscr *extract_sub(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 bsc_subscr *subscr; - - if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*resp)) { - LOGP(DMSC, LOGL_ERROR, "PagingResponse too small: %u\n", msgb_l3len(msg)); - return NULL; - } - - 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(%s)=%s\n", - gsm48_mi_type_name(mi_type), mi_string); - - switch (mi_type) { - case GSM_MI_TYPE_TMSI: - subscr = bsc_subscr_find_by_tmsi(conn->network->bsc_subscribers, - tmsi_from_string(mi_string)); - break; - case GSM_MI_TYPE_IMSI: - subscr = bsc_subscr_find_by_imsi(conn->network->bsc_subscribers, - mi_string); - break; - default: - subscr = NULL; - break; - } - - return subscr; -} - -/* we will need to stop the paging request */ -static int handle_page_resp(struct gsm_subscriber_connection *conn, struct msgb *msg) -{ - struct bsc_subscr *subscr = extract_sub(conn, msg); - - if (!subscr) { - LOGP(DMSC, LOGL_ERROR, "Non active subscriber got paged.\n"); - return -1; - } - - paging_request_stop(&conn->network->bts_list, conn->bts, subscr, conn, - msg); - bsc_subscr_put(subscr); - return 0; -} - -static int is_cm_service_for_emerg(struct msgb *msg) -{ - struct gsm48_service_request *cm; - struct gsm48_hdr *gh = msgb_l3(msg); - - if (msgb_l3len(msg) < sizeof(*gh) + sizeof(*cm)) { - LOGP(DMSC, LOGL_ERROR, "CM ServiceRequest does not fit.\n"); - return 0; - } - - cm = (struct gsm48_service_request *) &gh->data[0]; - return cm->cm_service_type == GSM48_CMSERV_EMERGENCY; -} - -struct bsc_msc_data *bsc_find_msc(struct gsm_subscriber_connection *conn, - struct msgb *msg) -{ - struct gsm48_hdr *gh; - int8_t pdisc; - uint8_t mtype; - struct osmo_bsc_data *bsc; - struct bsc_msc_data *msc, *pag_msc; - struct bsc_subscr *subscr; - int is_emerg = 0; - - bsc = conn->bts->network->bsc_data; - - if (msgb_l3len(msg) < sizeof(*gh)) { - LOGP(DMSC, LOGL_ERROR, "There is no GSM48 header here.\n"); - return NULL; - } - - gh = msgb_l3(msg); - pdisc = gsm48_hdr_pdisc(gh); - mtype = gsm48_hdr_msg_type(gh); - - /* - * We are asked to select a MSC here but they are not equal. We - * want to respond to a paging request on the MSC where we got the - * request from. This is where we need to decide where this connection - * will go. - */ - if (pdisc == GSM48_PDISC_RR && mtype == GSM48_MT_RR_PAG_RESP) - goto paging; - else if (pdisc == GSM48_PDISC_MM && mtype == GSM48_MT_MM_CM_SERV_REQ) { - is_emerg = is_cm_service_for_emerg(msg); - goto round_robin; - } else - goto round_robin; - -round_robin: - llist_for_each_entry(msc, &bsc->mscs, entry) { - if (!msc->msc_con->is_authenticated) - continue; - if (!is_emerg && msc->type != MSC_CON_TYPE_NORMAL) - continue; - if (is_emerg && !msc->allow_emerg) - continue; - - /* force round robin by moving it to the end */ - llist_move_tail(&msc->entry, &bsc->mscs); - return msc; - } - - return NULL; - -paging: - subscr = extract_sub(conn, msg); - - if (!subscr) { - LOGP(DMSC, LOGL_ERROR, "Got paged but no subscriber found.\n"); - return NULL; - } - - pag_msc = paging_get_data(conn->bts, subscr); - bsc_subscr_put(subscr); - - llist_for_each_entry(msc, &bsc->mscs, entry) { - if (msc != pag_msc) - continue; - - /* - * We don't check if the MSC is connected. In case it - * is not the connection will be dropped. - */ - - /* force round robin by moving it to the end */ - llist_move_tail(&msc->entry, &bsc->mscs); - return msc; - } - - LOGP(DMSC, LOGL_ERROR, "Got paged but no request found.\n"); - return NULL; -} - - -/** - * 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 = gsm48_hdr_pdisc(gh); - uint8_t mtype = gsm48_hdr_msg_type(gh); - - 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 int send_welcome_ussd(struct gsm_subscriber_connection *conn) -{ - struct osmo_bsc_sccp_con *bsc_con; - - bsc_con = conn->sccp_con; - if (!bsc_con) { - LOGP(DMSC, LOGL_DEBUG, "No SCCP connection associated.\n"); - return 0; - } - - if (!bsc_con->msc->ussd_welcome_txt) { - LOGP(DMSC, LOGL_DEBUG, "No USSD Welcome text defined.\n"); - return 0; - } - - return BSS_SEND_USSD; -} - -int bsc_send_welcome_ussd(struct gsm_subscriber_connection *conn) -{ - bsc_send_ussd_notify(conn, 1, conn->sccp_con->msc->ussd_welcome_txt); - bsc_send_ussd_release_complete(conn); - - return 0; -} - -static int bsc_patch_mm_info(struct gsm_subscriber_connection *conn, - uint8_t *data, unsigned int length) -{ - struct tlv_parsed tp; - int parse_res; - struct gsm_bts *bts = conn->bts; - int tzunits; - uint8_t tzbsd = 0; - uint8_t dst = 0; - - parse_res = tlv_parse(&tp, &gsm48_mm_att_tlvdef, data, length, 0, 0); - if (parse_res <= 0 && parse_res != -3) - /* FIXME: -3 means unknown IE error, so this accepts messages - * with unknown IEs. But parsing has aborted with the unknown - * IE and the message is broken or parsed incompletely. */ - return 0; - - /* Is TZ patching enabled? */ - struct gsm_tz *tz = &bts->network->tz; - if (!tz->override) - return 0; - - /* Convert tz.hr and tz.mn to units */ - if (tz->hr < 0) { - tzunits = -tz->hr*4; - tzbsd |= 0x08; - } else - tzunits = tz->hr*4; - - tzunits = tzunits + (tz->mn/15); - - tzbsd |= (tzunits % 10)*0x10 + (tzunits / 10); - - /* Convert DST value */ - if (tz->dst >= 0 && tz->dst <= 2) - dst = tz->dst; - - if (TLVP_PRESENT(&tp, GSM48_IE_UTC)) { - LOGP(DMSC, LOGL_DEBUG, - "Changing 'Local time zone' from 0x%02x to 0x%02x.\n", - TLVP_VAL(&tp, GSM48_IE_UTC)[6], tzbsd); - ((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_UTC)))[0] = tzbsd; - } - if (TLVP_PRESENT(&tp, GSM48_IE_NET_TIME_TZ)) { - LOGP(DMSC, LOGL_DEBUG, - "Changing 'Universal time and local time zone' TZ from " - "0x%02x to 0x%02x.\n", - TLVP_VAL(&tp, GSM48_IE_NET_TIME_TZ)[6], tzbsd); - ((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_NET_TIME_TZ)))[6] = tzbsd; - } -#ifdef GSM48_IE_NET_DST - if (TLVP_PRESENT(&tp, GSM48_IE_NET_DST)) { - LOGP(DMSC, LOGL_DEBUG, - "Changing 'Network daylight saving time' from " - "0x%02x to 0x%02x.\n", - TLVP_VAL(&tp, GSM48_IE_NET_DST)[0], dst); - ((uint8_t *)(TLVP_VAL(&tp, GSM48_IE_NET_DST)))[0] = dst; - } -#endif - - return 0; -} - -static int has_core_identity(struct bsc_msc_data *msc) -{ - if (msc->core_mnc != -1) - return 1; - if (msc->core_mcc != -1) - return 1; - if (msc->core_lac != -1) - return 1; - if (msc->core_ci != -1) - return 1; - return 0; -} - -/** - * Messages coming back from the MSC. - */ -int bsc_scan_msc_msg(struct gsm_subscriber_connection *conn, struct msgb *msg) -{ - struct bsc_msc_data *msc; - struct gsm_network *net; - struct gsm48_loc_area_id *lai; - struct gsm48_hdr *gh; - uint8_t pdisc; - uint8_t mtype; - int length = msgb_l3len(msg); - - if (length < sizeof(*gh)) { - LOGP(DMSC, LOGL_ERROR, "GSM48 header does not fit.\n"); - return -1; - } - - gh = (struct gsm48_hdr *) msgb_l3(msg); - length -= (const char *)&gh->data[0] - (const char *)gh; - - pdisc = gsm48_hdr_pdisc(gh); - if (pdisc != GSM48_PDISC_MM) - return 0; - - mtype = gsm48_hdr_msg_type(gh); - net = conn->bts->network; - msc = conn->sccp_con->msc; - - if (mtype == GSM48_MT_MM_LOC_UPD_ACCEPT) { - if (has_core_identity(msc)) { - if (msgb_l3len(msg) >= sizeof(*gh) + sizeof(*lai)) { - /* overwrite LAI in the message */ - 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) - return send_welcome_ussd(conn); - return 0; - } else if (mtype == GSM48_MT_MM_INFO) { - bsc_patch_mm_info(conn, &gh->data[0], length); - } - - return 0; -} |